kernel: refresh patches

[15.05/openwrt.git] / target / linux / brcm2708 / patches-3.14 / 0006-bcm2708-vchiq-driver.patch

From c9e2d1daa32fd2267d3a61ae3afc2f429746a01f Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Tue, 2 Jul 2013 23:42:01 +0100
Subject: [PATCH 06/54] bcm2708 vchiq driver

Signed-off-by: popcornmix <popcornmix@gmail.com>

vchiq: create_pagelist copes with vmalloc memory

Signed-off-by: Daniel Stone <daniels@collabora.com>

vchiq: fix the shim message release

Signed-off-by: Daniel Stone <daniels@collabora.com>

vchiq: export additional symbols

Signed-off-by: Daniel Stone <daniels@collabora.com>
---
 drivers/misc/Kconfig                               |    1 +
 drivers/misc/Makefile                              |    1 +
 drivers/misc/vc04_services/Kconfig                 |    9 +
 drivers/misc/vc04_services/Makefile                |   17 +
 .../interface/vchi/connections/connection.h        |  328 ++
 .../interface/vchi/message_drivers/message.h       |  204 ++
 drivers/misc/vc04_services/interface/vchi/vchi.h   |  373 ++
 .../misc/vc04_services/interface/vchi/vchi_cfg.h   |  224 ++
 .../interface/vchi/vchi_cfg_internal.h             |   71 +
 .../vc04_services/interface/vchi/vchi_common.h     |  163 +
 .../misc/vc04_services/interface/vchi/vchi_mh.h    |   42 +
 .../misc/vc04_services/interface/vchiq_arm/vchiq.h |   40 +
 .../vc04_services/interface/vchiq_arm/vchiq_2835.h |   42 +
 .../interface/vchiq_arm/vchiq_2835_arm.c           |  561 +++
 .../vc04_services/interface/vchiq_arm/vchiq_arm.c  | 2813 ++++++++++++++
 .../vc04_services/interface/vchiq_arm/vchiq_arm.h  |  212 ++
 .../interface/vchiq_arm/vchiq_build_info.h         |   37 +
 .../vc04_services/interface/vchiq_arm/vchiq_cfg.h  |   60 +
 .../interface/vchiq_arm/vchiq_connected.c          |  119 +
 .../interface/vchiq_arm/vchiq_connected.h          |   50 +
 .../vc04_services/interface/vchiq_arm/vchiq_core.c | 3824 ++++++++++++++++++++
 .../vc04_services/interface/vchiq_arm/vchiq_core.h |  706 ++++
 .../interface/vchiq_arm/vchiq_genversion           |   87 +
 .../vc04_services/interface/vchiq_arm/vchiq_if.h   |  188 +
 .../interface/vchiq_arm/vchiq_ioctl.h              |  129 +
 .../interface/vchiq_arm/vchiq_kern_lib.c           |  456 +++
 .../interface/vchiq_arm/vchiq_memdrv.h             |   71 +
 .../interface/vchiq_arm/vchiq_pagelist.h           |   58 +
 .../vc04_services/interface/vchiq_arm/vchiq_proc.c |  253 ++
 .../vc04_services/interface/vchiq_arm/vchiq_shim.c |  828 +++++
 .../vc04_services/interface/vchiq_arm/vchiq_util.c |  151 +
 .../vc04_services/interface/vchiq_arm/vchiq_util.h |   81 +
 .../interface/vchiq_arm/vchiq_version.c            |   59 +
 33 files changed, 12258 insertions(+)
 create mode 100644 drivers/misc/vc04_services/Kconfig
 create mode 100644 drivers/misc/vc04_services/Makefile
 create mode 100644 drivers/misc/vc04_services/interface/vchi/connections/connection.h
 create mode 100644 drivers/misc/vc04_services/interface/vchi/message_drivers/message.h
 create mode 100644 drivers/misc/vc04_services/interface/vchi/vchi.h
 create mode 100644 drivers/misc/vc04_services/interface/vchi/vchi_cfg.h
 create mode 100644 drivers/misc/vc04_services/interface/vchi/vchi_cfg_internal.h
 create mode 100644 drivers/misc/vc04_services/interface/vchi/vchi_common.h
 create mode 100644 drivers/misc/vc04_services/interface/vchi/vchi_mh.h
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq.h
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835.h
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.h
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_build_info.h
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_cfg.h
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.c
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.h
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.c
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.h
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_genversion
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_if.h
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_ioctl.h
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_kern_lib.c
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_memdrv.h
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_pagelist.h
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_proc.c
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_shim.c
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.c
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.h
 create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_version.c

--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -524,6 +524,7 @@ source "drivers/misc/carma/Kconfig"
 source "drivers/misc/altera-stapl/Kconfig"
 source "drivers/misc/mei/Kconfig"
 source "drivers/misc/vmw_vmci/Kconfig"
+source "drivers/misc/vc04_services/Kconfig"
 source "drivers/misc/mic/Kconfig"
 source "drivers/misc/genwqe/Kconfig"
 endmenu
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -52,5 +52,6 @@ obj-$(CONFIG_INTEL_MEI)               += mei/
 obj-$(CONFIG_VMWARE_VMCI)      += vmw_vmci/
 obj-$(CONFIG_LATTICE_ECP3_CONFIG)      += lattice-ecp3-config.o
 obj-$(CONFIG_SRAM)             += sram.o
+obj-y                          += vc04_services/
 obj-y                          += mic/
 obj-$(CONFIG_GENWQE)           += genwqe/
--- /dev/null
+++ b/drivers/misc/vc04_services/Kconfig
@@ -0,0 +1,9 @@
+config BCM2708_VCHIQ
+       tristate "Videocore VCHIQ"
+       depends on MACH_BCM2708
+       default y
+       help
+               Kernel to VideoCore communication interface for the
+               BCM2708 family of products.
+               Defaults to Y when the Broadcom Videocore services
+               are included in the build, N otherwise.
--- /dev/null
+++ b/drivers/misc/vc04_services/Makefile
@@ -0,0 +1,17 @@
+ifeq ($(CONFIG_MACH_BCM2708),y)
+
+obj-$(CONFIG_BCM2708_VCHIQ)    += vchiq.o
+
+vchiq-objs := \
+   interface/vchiq_arm/vchiq_core.o  \
+   interface/vchiq_arm/vchiq_arm.o \
+   interface/vchiq_arm/vchiq_kern_lib.o \
+   interface/vchiq_arm/vchiq_2835_arm.o \
+   interface/vchiq_arm/vchiq_proc.o \
+   interface/vchiq_arm/vchiq_shim.o \
+   interface/vchiq_arm/vchiq_util.o \
+   interface/vchiq_arm/vchiq_connected.o \
+
+ccflags-y += -DVCOS_VERIFY_BKPTS=1 -Idrivers/misc/vc04_services -DUSE_VCHIQ_ARM -D__VCCOREVER__=0x04000000
+
+endif
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchi/connections/connection.h
@@ -0,0 +1,328 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef CONNECTION_H_
+#define CONNECTION_H_
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/semaphore.h>
+
+#include "interface/vchi/vchi_cfg_internal.h"
+#include "interface/vchi/vchi_common.h"
+#include "interface/vchi/message_drivers/message.h"
+
+/******************************************************************************
+ Global defs
+ *****************************************************************************/
+
+// Opaque handle for a connection / service pair
+typedef struct opaque_vchi_connection_connected_service_handle_t *VCHI_CONNECTION_SERVICE_HANDLE_T;
+
+// opaque handle to the connection state information
+typedef struct opaque_vchi_connection_info_t VCHI_CONNECTION_STATE_T;
+
+typedef struct vchi_connection_t VCHI_CONNECTION_T;
+
+
+/******************************************************************************
+ API
+ *****************************************************************************/
+
+// Routine to init a connection with a particular low level driver
+typedef VCHI_CONNECTION_STATE_T * (*VCHI_CONNECTION_INIT_T)( struct vchi_connection_t * connection,
+                                                             const VCHI_MESSAGE_DRIVER_T * driver );
+
+// Routine to control CRC enabling at a connection level
+typedef int32_t (*VCHI_CONNECTION_CRC_CONTROL_T)( VCHI_CONNECTION_STATE_T *state_handle,
+                                                  VCHI_CRC_CONTROL_T control );
+
+// Routine to create a service
+typedef int32_t (*VCHI_CONNECTION_SERVICE_CONNECT_T)( VCHI_CONNECTION_STATE_T *state_handle,
+                                                      int32_t service_id,
+                                                      uint32_t rx_fifo_size,
+                                                      uint32_t tx_fifo_size,
+                                                      int server,
+                                                      VCHI_CALLBACK_T callback,
+                                                      void *callback_param,
+                                                      int32_t want_crc,
+                                                      int32_t want_unaligned_bulk_rx,
+                                                      int32_t want_unaligned_bulk_tx,
+                                                      VCHI_CONNECTION_SERVICE_HANDLE_T *service_handle );
+
+// Routine to close a service
+typedef int32_t (*VCHI_CONNECTION_SERVICE_DISCONNECT_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service_handle );
+
+// Routine to queue a message
+typedef int32_t (*VCHI_CONNECTION_SERVICE_QUEUE_MESSAGE_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service_handle,
+                                                            const void *data,
+                                                            uint32_t data_size,
+                                                            VCHI_FLAGS_T flags,
+                                                            void *msg_handle );
+
+// scatter-gather (vector) message queueing
+typedef int32_t (*VCHI_CONNECTION_SERVICE_QUEUE_MESSAGEV_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service_handle,
+                                                             VCHI_MSG_VECTOR_T *vector,
+                                                             uint32_t count,
+                                                             VCHI_FLAGS_T flags,
+                                                             void *msg_handle );
+
+// Routine to dequeue a message
+typedef int32_t (*VCHI_CONNECTION_SERVICE_DEQUEUE_MESSAGE_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service_handle,
+                                                              void *data,
+                                                              uint32_t max_data_size_to_read,
+                                                              uint32_t *actual_msg_size,
+                                                              VCHI_FLAGS_T flags );
+
+// Routine to peek at a message
+typedef int32_t (*VCHI_CONNECTION_SERVICE_PEEK_MESSAGE_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service_handle,
+                                                           void **data,
+                                                           uint32_t *msg_size,
+                                                           VCHI_FLAGS_T flags );
+
+// Routine to hold a message
+typedef int32_t (*VCHI_CONNECTION_SERVICE_HOLD_MESSAGE_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service_handle,
+                                                           void **data,
+                                                           uint32_t *msg_size,
+                                                           VCHI_FLAGS_T flags,
+                                                           void **message_handle );
+
+// Routine to initialise a received message iterator
+typedef int32_t (*VCHI_CONNECTION_SERVICE_LOOKAHEAD_MESSAGE_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service_handle,
+                                                                VCHI_MSG_ITER_T *iter,
+                                                                VCHI_FLAGS_T flags );
+
+// Routine to release a held message
+typedef int32_t (*VCHI_CONNECTION_HELD_MSG_RELEASE_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service_handle,
+                                                       void *message_handle );
+
+// Routine to get info on a held message
+typedef int32_t (*VCHI_CONNECTION_HELD_MSG_INFO_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service_handle,
+                                                    void *message_handle,
+                                                    void **data,
+                                                    int32_t *msg_size,
+                                                    uint32_t *tx_timestamp,
+                                                    uint32_t *rx_timestamp );
+
+// Routine to check whether the iterator has a next message
+typedef int32_t (*VCHI_CONNECTION_MSG_ITER_HAS_NEXT_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service,
+                                                       const VCHI_MSG_ITER_T *iter );
+
+// Routine to advance the iterator
+typedef int32_t (*VCHI_CONNECTION_MSG_ITER_NEXT_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service,
+                                                    VCHI_MSG_ITER_T *iter,
+                                                    void **data,
+                                                    uint32_t *msg_size );
+
+// Routine to remove the last message returned by the iterator
+typedef int32_t (*VCHI_CONNECTION_MSG_ITER_REMOVE_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service,
+                                                      VCHI_MSG_ITER_T *iter );
+
+// Routine to hold the last message returned by the iterator
+typedef int32_t (*VCHI_CONNECTION_MSG_ITER_HOLD_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service,
+                                                    VCHI_MSG_ITER_T *iter,
+                                                    void **msg_handle );
+
+// Routine to transmit bulk data
+typedef int32_t (*VCHI_CONNECTION_BULK_QUEUE_TRANSMIT_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service_handle,
+                                                          const void *data_src,
+                                                          uint32_t data_size,
+                                                          VCHI_FLAGS_T flags,
+                                                          void *bulk_handle );
+
+// Routine to receive data
+typedef int32_t (*VCHI_CONNECTION_BULK_QUEUE_RECEIVE_T)( VCHI_CONNECTION_SERVICE_HANDLE_T service_handle,
+                                                         void *data_dst,
+                                                         uint32_t data_size,
+                                                         VCHI_FLAGS_T flags,
+                                                         void *bulk_handle );
+
+// Routine to report if a server is available
+typedef int32_t (*VCHI_CONNECTION_SERVER_PRESENT)( VCHI_CONNECTION_STATE_T *state, int32_t service_id, int32_t peer_flags );
+
+// Routine to report the number of RX slots available
+typedef int (*VCHI_CONNECTION_RX_SLOTS_AVAILABLE)( const VCHI_CONNECTION_STATE_T *state );
+
+// Routine to report the RX slot size
+typedef uint32_t (*VCHI_CONNECTION_RX_SLOT_SIZE)( const VCHI_CONNECTION_STATE_T *state );
+
+// Callback to indicate that the other side has added a buffer to the rx bulk DMA FIFO
+typedef void (*VCHI_CONNECTION_RX_BULK_BUFFER_ADDED)(VCHI_CONNECTION_STATE_T *state,
+                                                     int32_t service,
+                                                     uint32_t length,
+                                                     MESSAGE_TX_CHANNEL_T channel,
+                                                     uint32_t channel_params,
+                                                     uint32_t data_length,
+                                                     uint32_t data_offset);
+
+// Callback to inform a service that a Xon or Xoff message has been received
+typedef void (*VCHI_CONNECTION_FLOW_CONTROL)(VCHI_CONNECTION_STATE_T *state, int32_t service_id, int32_t xoff);
+
+// Callback to inform a service that a server available reply message has been received
+typedef void (*VCHI_CONNECTION_SERVER_AVAILABLE_REPLY)(VCHI_CONNECTION_STATE_T *state, int32_t service_id, uint32_t flags);
+
+// Callback to indicate that bulk auxiliary messages have arrived
+typedef void (*VCHI_CONNECTION_BULK_AUX_RECEIVED)(VCHI_CONNECTION_STATE_T *state);
+
+// Callback to indicate that bulk auxiliary messages have arrived
+typedef void (*VCHI_CONNECTION_BULK_AUX_TRANSMITTED)(VCHI_CONNECTION_STATE_T *state, void *handle);
+
+// Callback with all the connection info you require
+typedef void (*VCHI_CONNECTION_INFO)(VCHI_CONNECTION_STATE_T *state, uint32_t protocol_version, uint32_t slot_size, uint32_t num_slots, uint32_t min_bulk_size);
+
+// Callback to inform of a disconnect
+typedef void (*VCHI_CONNECTION_DISCONNECT)(VCHI_CONNECTION_STATE_T *state, uint32_t flags);
+
+// Callback to inform of a power control request
+typedef void (*VCHI_CONNECTION_POWER_CONTROL)(VCHI_CONNECTION_STATE_T *state, MESSAGE_TX_CHANNEL_T channel, int32_t enable);
+
+// allocate memory suitably aligned for this connection
+typedef void * (*VCHI_BUFFER_ALLOCATE)(VCHI_CONNECTION_SERVICE_HANDLE_T service_handle, uint32_t * length);
+
+// free memory allocated by buffer_allocate
+typedef void   (*VCHI_BUFFER_FREE)(VCHI_CONNECTION_SERVICE_HANDLE_T service_handle, void * address);
+
+
+/******************************************************************************
+ System driver struct
+ *****************************************************************************/
+
+struct opaque_vchi_connection_api_t
+{
+   // Routine to init the connection
+   VCHI_CONNECTION_INIT_T                      init;
+
+   // Connection-level CRC control
+   VCHI_CONNECTION_CRC_CONTROL_T               crc_control;
+
+   // Routine to connect to or create service
+   VCHI_CONNECTION_SERVICE_CONNECT_T           service_connect;
+
+   // Routine to disconnect from a service
+   VCHI_CONNECTION_SERVICE_DISCONNECT_T        service_disconnect;
+
+   // Routine to queue a message
+   VCHI_CONNECTION_SERVICE_QUEUE_MESSAGE_T     service_queue_msg;
+
+   // scatter-gather (vector) message queue
+   VCHI_CONNECTION_SERVICE_QUEUE_MESSAGEV_T    service_queue_msgv;
+
+   // Routine to dequeue a message
+   VCHI_CONNECTION_SERVICE_DEQUEUE_MESSAGE_T   service_dequeue_msg;
+
+   // Routine to peek at a message
+   VCHI_CONNECTION_SERVICE_PEEK_MESSAGE_T      service_peek_msg;
+
+   // Routine to hold a message
+   VCHI_CONNECTION_SERVICE_HOLD_MESSAGE_T      service_hold_msg;
+
+   // Routine to initialise a received message iterator
+   VCHI_CONNECTION_SERVICE_LOOKAHEAD_MESSAGE_T service_look_ahead_msg;
+
+   // Routine to release a message
+   VCHI_CONNECTION_HELD_MSG_RELEASE_T          held_msg_release;
+
+   // Routine to get information on a held message
+   VCHI_CONNECTION_HELD_MSG_INFO_T             held_msg_info;
+
+   // Routine to check for next message on iterator
+   VCHI_CONNECTION_MSG_ITER_HAS_NEXT_T         msg_iter_has_next;
+
+   // Routine to get next message on iterator
+   VCHI_CONNECTION_MSG_ITER_NEXT_T             msg_iter_next;
+
+   // Routine to remove the last message returned by iterator
+   VCHI_CONNECTION_MSG_ITER_REMOVE_T           msg_iter_remove;
+
+   // Routine to hold the last message returned by iterator
+   VCHI_CONNECTION_MSG_ITER_HOLD_T             msg_iter_hold;
+
+   // Routine to transmit bulk data
+   VCHI_CONNECTION_BULK_QUEUE_TRANSMIT_T       bulk_queue_transmit;
+
+   // Routine to receive data
+   VCHI_CONNECTION_BULK_QUEUE_RECEIVE_T        bulk_queue_receive;
+
+   // Routine to report the available servers
+   VCHI_CONNECTION_SERVER_PRESENT              server_present;
+
+   // Routine to report the number of RX slots available
+   VCHI_CONNECTION_RX_SLOTS_AVAILABLE          connection_rx_slots_available;
+
+   // Routine to report the RX slot size
+   VCHI_CONNECTION_RX_SLOT_SIZE                connection_rx_slot_size;
+
+   // Callback to indicate that the other side has added a buffer to the rx bulk DMA FIFO
+   VCHI_CONNECTION_RX_BULK_BUFFER_ADDED        rx_bulk_buffer_added;
+
+   // Callback to inform a service that a Xon or Xoff message has been received
+   VCHI_CONNECTION_FLOW_CONTROL                flow_control;
+
+   // Callback to inform a service that a server available reply message has been received
+   VCHI_CONNECTION_SERVER_AVAILABLE_REPLY      server_available_reply;
+
+   // Callback to indicate that bulk auxiliary messages have arrived
+   VCHI_CONNECTION_BULK_AUX_RECEIVED           bulk_aux_received;
+
+   // Callback to indicate that a bulk auxiliary message has been transmitted
+   VCHI_CONNECTION_BULK_AUX_TRANSMITTED        bulk_aux_transmitted;
+
+   // Callback to provide information about the connection
+   VCHI_CONNECTION_INFO                        connection_info;
+
+   // Callback to notify that peer has requested disconnect
+   VCHI_CONNECTION_DISCONNECT                  disconnect;
+
+   // Callback to notify that peer has requested power change
+   VCHI_CONNECTION_POWER_CONTROL               power_control;
+
+   // allocate memory suitably aligned for this connection
+   VCHI_BUFFER_ALLOCATE                        buffer_allocate;
+
+   // free memory allocated by buffer_allocate
+   VCHI_BUFFER_FREE                            buffer_free;
+
+};
+
+struct vchi_connection_t {
+   const VCHI_CONNECTION_API_T *api;
+   VCHI_CONNECTION_STATE_T     *state;
+#ifdef VCHI_COARSE_LOCKING
+   struct semaphore             sem;
+#endif
+};
+
+
+#endif /* CONNECTION_H_ */
+
+/****************************** End of file **********************************/
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchi/message_drivers/message.h
@@ -0,0 +1,204 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _VCHI_MESSAGE_H_
+#define _VCHI_MESSAGE_H_
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/semaphore.h>
+
+#include "interface/vchi/vchi_cfg_internal.h"
+#include "interface/vchi/vchi_common.h"
+
+
+typedef enum message_event_type {
+   MESSAGE_EVENT_NONE,
+   MESSAGE_EVENT_NOP,
+   MESSAGE_EVENT_MESSAGE,
+   MESSAGE_EVENT_SLOT_COMPLETE,
+   MESSAGE_EVENT_RX_BULK_PAUSED,
+   MESSAGE_EVENT_RX_BULK_COMPLETE,
+   MESSAGE_EVENT_TX_COMPLETE,
+   MESSAGE_EVENT_MSG_DISCARDED
+} MESSAGE_EVENT_TYPE_T;
+
+typedef enum vchi_msg_flags
+{
+   VCHI_MSG_FLAGS_NONE                  = 0x0,
+   VCHI_MSG_FLAGS_TERMINATE_DMA         = 0x1
+} VCHI_MSG_FLAGS_T;
+
+typedef enum message_tx_channel
+{
+   MESSAGE_TX_CHANNEL_MESSAGE           = 0,
+   MESSAGE_TX_CHANNEL_BULK              = 1 // drivers may provide multiple bulk channels, from 1 upwards
+} MESSAGE_TX_CHANNEL_T;
+
+// Macros used for cycling through bulk channels
+#define MESSAGE_TX_CHANNEL_BULK_PREV(c) (MESSAGE_TX_CHANNEL_BULK+((c)-MESSAGE_TX_CHANNEL_BULK+VCHI_MAX_BULK_TX_CHANNELS_PER_CONNECTION-1)%VCHI_MAX_BULK_TX_CHANNELS_PER_CONNECTION)
+#define MESSAGE_TX_CHANNEL_BULK_NEXT(c) (MESSAGE_TX_CHANNEL_BULK+((c)-MESSAGE_TX_CHANNEL_BULK+1)%VCHI_MAX_BULK_TX_CHANNELS_PER_CONNECTION)
+
+typedef enum message_rx_channel
+{
+   MESSAGE_RX_CHANNEL_MESSAGE           = 0,
+   MESSAGE_RX_CHANNEL_BULK              = 1 // drivers may provide multiple bulk channels, from 1 upwards
+} MESSAGE_RX_CHANNEL_T;
+
+// Message receive slot information
+typedef struct rx_msg_slot_info {
+
+   struct rx_msg_slot_info *next;
+   //struct slot_info *prev;
+#if !defined VCHI_COARSE_LOCKING
+   struct semaphore   sem;
+#endif
+
+   uint8_t           *addr;               // base address of slot
+   uint32_t           len;                // length of slot in bytes
+
+   uint32_t           write_ptr;          // hardware causes this to advance
+   uint32_t           read_ptr;           // this module does the reading
+   int                active;             // is this slot in the hardware dma fifo?
+   uint32_t           msgs_parsed;        // count how many messages are in this slot
+   uint32_t           msgs_released;      // how many messages have been released
+   void              *state;              // connection state information
+   uint8_t            ref_count[VCHI_MAX_SERVICES_PER_CONNECTION];          // reference count for slots held by services
+} RX_MSG_SLOTINFO_T;
+
+// The message driver no longer needs to know about the fields of RX_BULK_SLOTINFO_T - sort this out.
+// In particular, it mustn't use addr and len - they're the client buffer, but the message
+// driver will be tasked with sending the aligned core section.
+typedef struct rx_bulk_slotinfo_t {
+   struct rx_bulk_slotinfo_t *next;
+
+   struct semaphore *blocking;
+
+   // needed by DMA
+   void        *addr;
+   uint32_t     len;
+
+   // needed for the callback
+   void        *service;
+   void        *handle;
+   VCHI_FLAGS_T flags;
+} RX_BULK_SLOTINFO_T;
+
+
+/* ----------------------------------------------------------------------
+ * each connection driver will have a pool of the following struct.
+ *
+ * the pool will be managed by vchi_qman_*
+ * this means there will be multiple queues (single linked lists)
+ * a given struct message_info will be on exactly one of these queues
+ * at any one time
+ * -------------------------------------------------------------------- */
+typedef struct rx_message_info {
+
+   struct message_info *next;
+   //struct message_info *prev;
+
+   uint8_t    *addr;
+   uint32_t   len;
+   RX_MSG_SLOTINFO_T *slot; // points to whichever slot contains this message
+   uint32_t   tx_timestamp;
+   uint32_t   rx_timestamp;
+
+} RX_MESSAGE_INFO_T;
+
+typedef struct {
+   MESSAGE_EVENT_TYPE_T type;
+
+   struct {
+      // for messages
+      void    *addr;           // address of message
+      uint16_t slot_delta;     // whether this message indicated slot delta
+      uint32_t len;            // length of message
+      RX_MSG_SLOTINFO_T *slot; // slot this message is in
+      int32_t  service;   // service id this message is destined for
+      uint32_t tx_timestamp;   // timestamp from the header
+      uint32_t rx_timestamp;   // timestamp when we parsed it
+   } message;
+
+   // FIXME: cleanup slot reporting...
+   RX_MSG_SLOTINFO_T *rx_msg;
+   RX_BULK_SLOTINFO_T *rx_bulk;
+   void *tx_handle;
+   MESSAGE_TX_CHANNEL_T tx_channel;
+
+} MESSAGE_EVENT_T;
+
+
+// callbacks
+typedef void VCHI_MESSAGE_DRIVER_EVENT_CALLBACK_T( void *state );
+
+typedef struct {
+   VCHI_MESSAGE_DRIVER_EVENT_CALLBACK_T *event_callback;
+} VCHI_MESSAGE_DRIVER_OPEN_T;
+
+
+// handle to this instance of message driver (as returned by ->open)
+typedef struct opaque_mhandle_t *VCHI_MDRIVER_HANDLE_T;
+
+struct opaque_vchi_message_driver_t {
+   VCHI_MDRIVER_HANDLE_T *(*open)( VCHI_MESSAGE_DRIVER_OPEN_T *params, void *state );
+   int32_t (*suspending)( VCHI_MDRIVER_HANDLE_T *handle );
+   int32_t (*resumed)( VCHI_MDRIVER_HANDLE_T *handle );
+   int32_t (*power_control)( VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_TX_CHANNEL_T, int32_t enable );
+   int32_t (*add_msg_rx_slot)( VCHI_MDRIVER_HANDLE_T *handle, RX_MSG_SLOTINFO_T *slot );      // rx message
+   int32_t (*add_bulk_rx)( VCHI_MDRIVER_HANDLE_T *handle, void *data, uint32_t len, RX_BULK_SLOTINFO_T *slot );  // rx data (bulk)
+   int32_t (*send)( VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_TX_CHANNEL_T channel, const void *data, uint32_t len, VCHI_MSG_FLAGS_T flags, void *send_handle );      // tx (message & bulk)
+   void    (*next_event)( VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_EVENT_T *event );     // get the next event from message_driver
+   int32_t (*enable)( VCHI_MDRIVER_HANDLE_T *handle );
+   int32_t (*form_message)( VCHI_MDRIVER_HANDLE_T *handle, int32_t service_id, VCHI_MSG_VECTOR_T *vector, uint32_t count, void
+                            *address, uint32_t length_avail, uint32_t max_total_length, int32_t pad_to_fill, int32_t allow_partial );
+
+   int32_t (*update_message)( VCHI_MDRIVER_HANDLE_T *handle, void *dest, int16_t *slot_count );
+   int32_t (*buffer_aligned)( VCHI_MDRIVER_HANDLE_T *handle, int tx, int uncached, const void *address, const uint32_t length );
+   void *  (*allocate_buffer)( VCHI_MDRIVER_HANDLE_T *handle, uint32_t *length );
+   void    (*free_buffer)( VCHI_MDRIVER_HANDLE_T *handle, void *address );
+   int     (*rx_slot_size)( VCHI_MDRIVER_HANDLE_T *handle, int msg_size );
+   int     (*tx_slot_size)( VCHI_MDRIVER_HANDLE_T *handle, int msg_size );
+
+   int32_t  (*tx_supports_terminate)( const VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_TX_CHANNEL_T channel );
+   uint32_t (*tx_bulk_chunk_size)( const VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_TX_CHANNEL_T channel );
+   int     (*tx_alignment)( const VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_TX_CHANNEL_T channel );
+   int     (*rx_alignment)( const VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_RX_CHANNEL_T channel );
+   void    (*form_bulk_aux)( VCHI_MDRIVER_HANDLE_T *handle, MESSAGE_TX_CHANNEL_T channel, const void *data, uint32_t len, uint32_t chunk_size, const void **aux_data, int32_t *aux_len );
+   void    (*debug)( VCHI_MDRIVER_HANDLE_T *handle );
+};
+
+
+#endif // _VCHI_MESSAGE_H_
+
+/****************************** End of file ***********************************/
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchi/vchi.h
@@ -0,0 +1,373 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHI_H_
+#define VCHI_H_
+
+#include "interface/vchi/vchi_cfg.h"
+#include "interface/vchi/vchi_common.h"
+#include "interface/vchi/connections/connection.h"
+#include "vchi_mh.h"
+
+
+/******************************************************************************
+ Global defs
+ *****************************************************************************/
+
+#define VCHI_BULK_ROUND_UP(x)     ((((unsigned long)(x))+VCHI_BULK_ALIGN-1) & ~(VCHI_BULK_ALIGN-1))
+#define VCHI_BULK_ROUND_DOWN(x)   (((unsigned long)(x)) & ~(VCHI_BULK_ALIGN-1))
+#define VCHI_BULK_ALIGN_NBYTES(x) (VCHI_BULK_ALIGNED(x) ? 0 : (VCHI_BULK_ALIGN - ((unsigned long)(x) & (VCHI_BULK_ALIGN-1))))
+
+#ifdef USE_VCHIQ_ARM
+#define VCHI_BULK_ALIGNED(x)      1
+#else
+#define VCHI_BULK_ALIGNED(x)      (((unsigned long)(x) & (VCHI_BULK_ALIGN-1)) == 0)
+#endif
+
+struct vchi_version {
+       uint32_t version;
+       uint32_t version_min;
+};
+#define VCHI_VERSION(v_) { v_, v_ }
+#define VCHI_VERSION_EX(v_, m_) { v_, m_ }
+
+typedef enum
+{
+   VCHI_VEC_POINTER,
+   VCHI_VEC_HANDLE,
+   VCHI_VEC_LIST
+} VCHI_MSG_VECTOR_TYPE_T;
+
+typedef struct vchi_msg_vector_ex {
+
+   VCHI_MSG_VECTOR_TYPE_T type;
+   union
+   {
+      // a memory handle
+      struct
+      {
+         VCHI_MEM_HANDLE_T handle;
+         uint32_t offset;
+         int32_t vec_len;
+      } handle;
+
+      // an ordinary data pointer
+      struct
+      {
+         const void *vec_base;
+         int32_t vec_len;
+      } ptr;
+
+      // a nested vector list
+      struct
+      {
+         struct vchi_msg_vector_ex *vec;
+         uint32_t vec_len;
+      } list;
+   } u;
+} VCHI_MSG_VECTOR_EX_T;
+
+
+// Construct an entry in a msg vector for a pointer (p) of length (l)
+#define VCHI_VEC_POINTER(p,l)  VCHI_VEC_POINTER, { { (VCHI_MEM_HANDLE_T)(p), (l) } }
+
+// Construct an entry in a msg vector for a message handle (h), starting at offset (o) of length (l)
+#define VCHI_VEC_HANDLE(h,o,l) VCHI_VEC_HANDLE,  { { (h), (o), (l) } }
+
+// Macros to manipulate 'FOURCC' values
+#define MAKE_FOURCC(x) ((int32_t)( (x[0] << 24) | (x[1] << 16) | (x[2] << 8) | x[3] ))
+#define FOURCC_TO_CHAR(x) (x >> 24) & 0xFF,(x >> 16) & 0xFF,(x >> 8) & 0xFF, x & 0xFF
+
+
+// Opaque service information
+struct opaque_vchi_service_t;
+
+// Descriptor for a held message. Allocated by client, initialised by vchi_msg_hold,
+// vchi_msg_iter_hold or vchi_msg_iter_hold_next. Fields are for internal VCHI use only.
+typedef struct
+{
+   struct opaque_vchi_service_t *service;
+   void *message;
+} VCHI_HELD_MSG_T;
+
+
+
+// structure used to provide the information needed to open a server or a client
+typedef struct {
+       struct vchi_version version;
+       int32_t service_id;
+       VCHI_CONNECTION_T *connection;
+       uint32_t rx_fifo_size;
+       uint32_t tx_fifo_size;
+       VCHI_CALLBACK_T callback;
+       void *callback_param;
+       /* client intends to receive bulk transfers of
+               odd lengths or into unaligned buffers */
+       int32_t want_unaligned_bulk_rx;
+       /* client intends to transmit bulk transfers of
+               odd lengths or out of unaligned buffers */
+       int32_t want_unaligned_bulk_tx;
+       /* client wants to check CRCs on (bulk) xfers.
+               Only needs to be set at 1 end - will do both directions. */
+       int32_t want_crc;
+} SERVICE_CREATION_T;
+
+// Opaque handle for a VCHI instance
+typedef struct opaque_vchi_instance_handle_t *VCHI_INSTANCE_T;
+
+// Opaque handle for a server or client
+typedef struct opaque_vchi_service_handle_t *VCHI_SERVICE_HANDLE_T;
+
+// Service registration & startup
+typedef void (*VCHI_SERVICE_INIT)(VCHI_INSTANCE_T initialise_instance, VCHI_CONNECTION_T **connections, uint32_t num_connections);
+
+typedef struct service_info_tag {
+   const char * const vll_filename; /* VLL to load to start this service. This is an empty string if VLL is "static" */
+   VCHI_SERVICE_INIT init;          /* Service initialisation function */
+   void *vll_handle;                /* VLL handle; NULL when unloaded or a "static VLL" in build */
+} SERVICE_INFO_T;
+
+/******************************************************************************
+ Global funcs - implementation is specific to which side you are on (local / remote)
+ *****************************************************************************/
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+extern /*@observer@*/ VCHI_CONNECTION_T * vchi_create_connection( const VCHI_CONNECTION_API_T * function_table,
+                                                   const VCHI_MESSAGE_DRIVER_T * low_level);
+
+
+// Routine used to initialise the vchi on both local + remote connections
+extern int32_t vchi_initialise( VCHI_INSTANCE_T *instance_handle );
+
+extern int32_t vchi_exit( void );
+
+extern int32_t vchi_connect( VCHI_CONNECTION_T **connections,
+                             const uint32_t num_connections,
+                             VCHI_INSTANCE_T instance_handle );
+
+//When this is called, ensure that all services have no data pending.
+//Bulk transfers can remain 'queued'
+extern int32_t vchi_disconnect( VCHI_INSTANCE_T instance_handle );
+
+// Global control over bulk CRC checking
+extern int32_t vchi_crc_control( VCHI_CONNECTION_T *connection,
+                                 VCHI_CRC_CONTROL_T control );
+
+// helper functions
+extern void * vchi_allocate_buffer(VCHI_SERVICE_HANDLE_T handle, uint32_t *length);
+extern void vchi_free_buffer(VCHI_SERVICE_HANDLE_T handle, void *address);
+extern uint32_t vchi_current_time(VCHI_INSTANCE_T instance_handle);
+
+
+/******************************************************************************
+ Global service API
+ *****************************************************************************/
+// Routine to create a named service
+extern int32_t vchi_service_create( VCHI_INSTANCE_T instance_handle,
+                                    SERVICE_CREATION_T *setup,
+                                    VCHI_SERVICE_HANDLE_T *handle );
+
+// Routine to destory a service
+extern int32_t vchi_service_destroy( const VCHI_SERVICE_HANDLE_T handle );
+
+// Routine to open a named service
+extern int32_t vchi_service_open( VCHI_INSTANCE_T instance_handle,
+                                  SERVICE_CREATION_T *setup,
+                                  VCHI_SERVICE_HANDLE_T *handle);
+
+extern int32_t vchi_get_peer_version( const VCHI_SERVICE_HANDLE_T handle,
+                                      short *peer_version );
+
+// Routine to close a named service
+extern int32_t vchi_service_close( const VCHI_SERVICE_HANDLE_T handle );
+
+// Routine to increment ref count on a named service
+extern int32_t vchi_service_use( const VCHI_SERVICE_HANDLE_T handle );
+
+// Routine to decrement ref count on a named service
+extern int32_t vchi_service_release( const VCHI_SERVICE_HANDLE_T handle );
+
+// Routine to send a message accross a service
+extern int32_t vchi_msg_queue( VCHI_SERVICE_HANDLE_T handle,
+                               const void *data,
+                               uint32_t data_size,
+                               VCHI_FLAGS_T flags,
+                               void *msg_handle );
+
+// scatter-gather (vector) and send message
+int32_t vchi_msg_queuev_ex( VCHI_SERVICE_HANDLE_T handle,
+                            VCHI_MSG_VECTOR_EX_T *vector,
+                            uint32_t count,
+                            VCHI_FLAGS_T flags,
+                            void *msg_handle );
+
+// legacy scatter-gather (vector) and send message, only handles pointers
+int32_t vchi_msg_queuev( VCHI_SERVICE_HANDLE_T handle,
+                         VCHI_MSG_VECTOR_T *vector,
+                         uint32_t count,
+                         VCHI_FLAGS_T flags,
+                         void *msg_handle );
+
+// Routine to receive a msg from a service
+// Dequeue is equivalent to hold, copy into client buffer, release
+extern int32_t vchi_msg_dequeue( VCHI_SERVICE_HANDLE_T handle,
+                                 void *data,
+                                 uint32_t max_data_size_to_read,
+                                 uint32_t *actual_msg_size,
+                                 VCHI_FLAGS_T flags );
+
+// Routine to look at a message in place.
+// The message is not dequeued, so a subsequent call to peek or dequeue
+// will return the same message.
+extern int32_t vchi_msg_peek( VCHI_SERVICE_HANDLE_T handle,
+                              void **data,
+                              uint32_t *msg_size,
+                              VCHI_FLAGS_T flags );
+
+// Routine to remove a message after it has been read in place with peek
+// The first message on the queue is dequeued.
+extern int32_t vchi_msg_remove( VCHI_SERVICE_HANDLE_T handle );
+
+// Routine to look at a message in place.
+// The message is dequeued, so the caller is left holding it; the descriptor is
+// filled in and must be released when the user has finished with the message.
+extern int32_t vchi_msg_hold( VCHI_SERVICE_HANDLE_T handle,
+                              void **data,        // } may be NULL, as info can be
+                              uint32_t *msg_size, // } obtained from HELD_MSG_T
+                              VCHI_FLAGS_T flags,
+                              VCHI_HELD_MSG_T *message_descriptor );
+
+// Initialise an iterator to look through messages in place
+extern int32_t vchi_msg_look_ahead( VCHI_SERVICE_HANDLE_T handle,
+                                    VCHI_MSG_ITER_T *iter,
+                                    VCHI_FLAGS_T flags );
+
+/******************************************************************************
+ Global service support API - operations on held messages and message iterators
+ *****************************************************************************/
+
+// Routine to get the address of a held message
+extern void *vchi_held_msg_ptr( const VCHI_HELD_MSG_T *message );
+
+// Routine to get the size of a held message
+extern int32_t vchi_held_msg_size( const VCHI_HELD_MSG_T *message );
+
+// Routine to get the transmit timestamp as written into the header by the peer
+extern uint32_t vchi_held_msg_tx_timestamp( const VCHI_HELD_MSG_T *message );
+
+// Routine to get the reception timestamp, written as we parsed the header
+extern uint32_t vchi_held_msg_rx_timestamp( const VCHI_HELD_MSG_T *message );
+
+// Routine to release a held message after it has been processed
+extern int32_t vchi_held_msg_release( VCHI_HELD_MSG_T *message );
+
+// Indicates whether the iterator has a next message.
+extern int32_t vchi_msg_iter_has_next( const VCHI_MSG_ITER_T *iter );
+
+// Return the pointer and length for the next message and advance the iterator.
+extern int32_t vchi_msg_iter_next( VCHI_MSG_ITER_T *iter,
+                                   void **data,
+                                   uint32_t *msg_size );
+
+// Remove the last message returned by vchi_msg_iter_next.
+// Can only be called once after each call to vchi_msg_iter_next.
+extern int32_t vchi_msg_iter_remove( VCHI_MSG_ITER_T *iter );
+
+// Hold the last message returned by vchi_msg_iter_next.
+// Can only be called once after each call to vchi_msg_iter_next.
+extern int32_t vchi_msg_iter_hold( VCHI_MSG_ITER_T *iter,
+                                   VCHI_HELD_MSG_T *message );
+
+// Return information for the next message, and hold it, advancing the iterator.
+extern int32_t vchi_msg_iter_hold_next( VCHI_MSG_ITER_T *iter,
+                                        void **data,        // } may be NULL
+                                        uint32_t *msg_size, // }
+                                        VCHI_HELD_MSG_T *message );
+
+
+/******************************************************************************
+ Global bulk API
+ *****************************************************************************/
+
+// Routine to prepare interface for a transfer from the other side
+extern int32_t vchi_bulk_queue_receive( VCHI_SERVICE_HANDLE_T handle,
+                                        void *data_dst,
+                                        uint32_t data_size,
+                                        VCHI_FLAGS_T flags,
+                                        void *transfer_handle );
+
+
+// Prepare interface for a transfer from the other side into relocatable memory.
+int32_t vchi_bulk_queue_receive_reloc( const VCHI_SERVICE_HANDLE_T handle,
+                                       VCHI_MEM_HANDLE_T h_dst,
+                                       uint32_t offset,
+                                       uint32_t data_size,
+                                       const VCHI_FLAGS_T flags,
+                                       void * const bulk_handle );
+
+// Routine to queue up data ready for transfer to the other (once they have signalled they are ready)
+extern int32_t vchi_bulk_queue_transmit( VCHI_SERVICE_HANDLE_T handle,
+                                         const void *data_src,
+                                         uint32_t data_size,
+                                         VCHI_FLAGS_T flags,
+                                         void *transfer_handle );
+
+
+/******************************************************************************
+ Configuration plumbing
+ *****************************************************************************/
+
+// function prototypes for the different mid layers (the state info gives the different physical connections)
+extern const VCHI_CONNECTION_API_T *single_get_func_table( void );
+//extern const VCHI_CONNECTION_API_T *local_server_get_func_table( void );
+//extern const VCHI_CONNECTION_API_T *local_client_get_func_table( void );
+
+// declare all message drivers here
+const VCHI_MESSAGE_DRIVER_T *vchi_mphi_message_driver_func_table( void );
+
+#ifdef __cplusplus
+}
+#endif
+
+extern int32_t vchi_bulk_queue_transmit_reloc( VCHI_SERVICE_HANDLE_T handle,
+                                               VCHI_MEM_HANDLE_T h_src,
+                                               uint32_t offset,
+                                               uint32_t data_size,
+                                               VCHI_FLAGS_T flags,
+                                               void *transfer_handle );
+#endif /* VCHI_H_ */
+
+/****************************** End of file **********************************/
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchi/vchi_cfg.h
@@ -0,0 +1,224 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHI_CFG_H_
+#define VCHI_CFG_H_
+
+/****************************************************************************************
+ * Defines in this first section are part of the VCHI API and may be examined by VCHI
+ * services.
+ ***************************************************************************************/
+
+/* Required alignment of base addresses for bulk transfer, if unaligned transfers are not enabled */
+/* Really determined by the message driver, and should be available from a run-time call. */
+#ifndef VCHI_BULK_ALIGN
+#   if __VCCOREVER__ >= 0x04000000
+#       define VCHI_BULK_ALIGN 32 // Allows for the need to do cache cleans
+#   else
+#       define VCHI_BULK_ALIGN 16
+#   endif
+#endif
+
+/* Required length multiple for bulk transfers, if unaligned transfers are not enabled */
+/* May be less than or greater than VCHI_BULK_ALIGN */
+/* Really determined by the message driver, and should be available from a run-time call. */
+#ifndef VCHI_BULK_GRANULARITY
+#   if __VCCOREVER__ >= 0x04000000
+#       define VCHI_BULK_GRANULARITY 32 // Allows for the need to do cache cleans
+#   else
+#       define VCHI_BULK_GRANULARITY 16
+#   endif
+#endif
+
+/* The largest possible message to be queued with vchi_msg_queue. */
+#ifndef VCHI_MAX_MSG_SIZE
+#   if defined VCHI_LOCAL_HOST_PORT
+#       define VCHI_MAX_MSG_SIZE     16384         // makes file transfers fast, but should they be using bulk?
+#   else
+#       define VCHI_MAX_MSG_SIZE      4096 // NOTE: THIS MUST BE LARGER THAN OR EQUAL TO THE SIZE OF THE KHRONOS MERGE BUFFER!!
+#   endif
+#endif
+
+/******************************************************************************************
+ * Defines below are system configuration options, and should not be used by VCHI services.
+ *****************************************************************************************/
+
+/* How many connections can we support? A localhost implementation uses 2 connections,
+ * 1 for host-app, 1 for VMCS, and these are hooked together by a loopback MPHI VCFW
+ * driver. */
+#ifndef VCHI_MAX_NUM_CONNECTIONS
+#   define VCHI_MAX_NUM_CONNECTIONS 3
+#endif
+
+/* How many services can we open per connection? Extending this doesn't cost processing time, just a small
+ * amount of static memory. */
+#ifndef VCHI_MAX_SERVICES_PER_CONNECTION
+#  define VCHI_MAX_SERVICES_PER_CONNECTION 36
+#endif
+
+/* Adjust if using a message driver that supports more logical TX channels */
+#ifndef VCHI_MAX_BULK_TX_CHANNELS_PER_CONNECTION
+#   define VCHI_MAX_BULK_TX_CHANNELS_PER_CONNECTION 9 // 1 MPHI + 8 CCP2 logical channels
+#endif
+
+/* Adjust if using a message driver that supports more logical RX channels */
+#ifndef VCHI_MAX_BULK_RX_CHANNELS_PER_CONNECTION
+#   define VCHI_MAX_BULK_RX_CHANNELS_PER_CONNECTION 1 // 1 MPHI
+#endif
+
+/* How many receive slots do we use. This times VCHI_MAX_MSG_SIZE gives the effective
+ * receive queue space, less message headers. */
+#ifndef VCHI_NUM_READ_SLOTS
+#  if defined(VCHI_LOCAL_HOST_PORT)
+#     define VCHI_NUM_READ_SLOTS 4
+#  else
+#     define VCHI_NUM_READ_SLOTS 48
+#  endif
+#endif
+
+/* Do we utilise overrun facility for receive message slots? Can aid peer transmit
+ * performance. Only define on VideoCore end, talking to host.
+ */
+//#define VCHI_MSG_RX_OVERRUN
+
+/* How many transmit slots do we use. Generally don't need many, as the hardware driver
+ * underneath VCHI will usually have its own buffering. */
+#ifndef VCHI_NUM_WRITE_SLOTS
+#  define VCHI_NUM_WRITE_SLOTS 4
+#endif
+
+/* If a service has held or queued received messages in VCHI_XOFF_THRESHOLD or more slots,
+ * then it's taking up too much buffer space, and the peer service will be told to stop
+ * transmitting with an XOFF message. For this to be effective, the VCHI_NUM_READ_SLOTS
+ * needs to be considerably bigger than VCHI_NUM_WRITE_SLOTS, or the transmit latency
+ * is too high. */
+#ifndef VCHI_XOFF_THRESHOLD
+#  define VCHI_XOFF_THRESHOLD (VCHI_NUM_READ_SLOTS / 2)
+#endif
+
+/* After we've sent an XOFF, the peer will be told to resume transmission once the local
+ * service has dequeued/released enough messages that it's now occupying
+ * VCHI_XON_THRESHOLD slots or fewer. */
+#ifndef VCHI_XON_THRESHOLD
+#  define VCHI_XON_THRESHOLD (VCHI_NUM_READ_SLOTS / 4)
+#endif
+
+/* A size below which a bulk transfer omits the handshake completely and always goes
+ * via the message channel, if bulk auxiliary is being sent on that service. (The user
+ * can guarantee this by enabling unaligned transmits).
+ * Not API. */
+#ifndef VCHI_MIN_BULK_SIZE
+#  define VCHI_MIN_BULK_SIZE    ( VCHI_MAX_MSG_SIZE / 2 < 4096 ? VCHI_MAX_MSG_SIZE / 2 : 4096 )
+#endif
+
+/* Maximum size of bulk transmission chunks, for each interface type. A trade-off between
+ * speed and latency; the smaller the chunk size the better change of messages and other
+ * bulk transmissions getting in when big bulk transfers are happening. Set to 0 to not
+ * break transmissions into chunks.
+ */
+#ifndef VCHI_MAX_BULK_CHUNK_SIZE_MPHI
+#  define VCHI_MAX_BULK_CHUNK_SIZE_MPHI (16 * 1024)
+#endif
+
+/* NB Chunked CCP2 transmissions violate the letter of the CCP2 spec by using "JPEG8" mode
+ * with multiple-line frames. Only use if the receiver can cope. */
+#ifndef VCHI_MAX_BULK_CHUNK_SIZE_CCP2
+#  define VCHI_MAX_BULK_CHUNK_SIZE_CCP2 0
+#endif
+
+/* How many TX messages can we have pending in our transmit slots. Once exhausted,
+ * vchi_msg_queue will be blocked. */
+#ifndef VCHI_TX_MSG_QUEUE_SIZE
+#  define VCHI_TX_MSG_QUEUE_SIZE           256
+#endif
+
+/* How many RX messages can we have parsed in the receive slots. Once exhausted, parsing
+ * will be suspended until older messages are dequeued/released. */
+#ifndef VCHI_RX_MSG_QUEUE_SIZE
+#  define VCHI_RX_MSG_QUEUE_SIZE           256
+#endif
+
+/* Really should be able to cope if we run out of received message descriptors, by
+ * suspending parsing as the comment above says, but we don't. This sweeps the issue
+ * under the carpet. */
+#if VCHI_RX_MSG_QUEUE_SIZE < (VCHI_MAX_MSG_SIZE/16 + 1) * VCHI_NUM_READ_SLOTS
+#  undef VCHI_RX_MSG_QUEUE_SIZE
+#  define VCHI_RX_MSG_QUEUE_SIZE (VCHI_MAX_MSG_SIZE/16 + 1) * VCHI_NUM_READ_SLOTS
+#endif
+
+/* How many bulk transmits can we have pending. Once exhausted, vchi_bulk_queue_transmit
+ * will be blocked. */
+#ifndef VCHI_TX_BULK_QUEUE_SIZE
+#  define VCHI_TX_BULK_QUEUE_SIZE           64
+#endif
+
+/* How many bulk receives can we have pending. Once exhausted, vchi_bulk_queue_receive
+ * will be blocked. */
+#ifndef VCHI_RX_BULK_QUEUE_SIZE
+#  define VCHI_RX_BULK_QUEUE_SIZE           64
+#endif
+
+/* A limit on how many outstanding bulk requests we expect the peer to give us. If
+ * the peer asks for more than this, VCHI will fail and assert. The number is determined
+ * by the peer's hardware - it's the number of outstanding requests that can be queued
+ * on all bulk channels. VC3's MPHI peripheral allows 16. */
+#ifndef VCHI_MAX_PEER_BULK_REQUESTS
+#  define VCHI_MAX_PEER_BULK_REQUESTS       32
+#endif
+
+/* Define VCHI_CCP2TX_MANUAL_POWER if the host tells us when to turn the CCP2
+ * transmitter on and off.
+ */
+/*#define VCHI_CCP2TX_MANUAL_POWER*/
+
+#ifndef VCHI_CCP2TX_MANUAL_POWER
+
+/* Timeout (in milliseconds) for putting the CCP2TX interface into IDLE state. Set
+ * negative for no IDLE.
+ */
+#  ifndef VCHI_CCP2TX_IDLE_TIMEOUT
+#    define VCHI_CCP2TX_IDLE_TIMEOUT        5
+#  endif
+
+/* Timeout (in milliseconds) for putting the CCP2TX interface into OFF state. Set
+ * negative for no OFF.
+ */
+#  ifndef VCHI_CCP2TX_OFF_TIMEOUT
+#    define VCHI_CCP2TX_OFF_TIMEOUT         1000
+#  endif
+
+#endif /* VCHI_CCP2TX_MANUAL_POWER */
+
+#endif /* VCHI_CFG_H_ */
+
+/****************************** End of file **********************************/
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchi/vchi_cfg_internal.h
@@ -0,0 +1,71 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHI_CFG_INTERNAL_H_
+#define VCHI_CFG_INTERNAL_H_
+
+/****************************************************************************************
+ * Control optimisation attempts.
+ ***************************************************************************************/
+
+// Don't use lots of short-term locks - use great long ones, reducing the overall locks-per-second
+#define VCHI_COARSE_LOCKING
+
+// Avoid lock then unlock on exit from blocking queue operations (msg tx, bulk rx/tx)
+// (only relevant if VCHI_COARSE_LOCKING)
+#define VCHI_ELIDE_BLOCK_EXIT_LOCK
+
+// Avoid lock on non-blocking peek
+// (only relevant if VCHI_COARSE_LOCKING)
+#define VCHI_AVOID_PEEK_LOCK
+
+// Use one slot-handler thread per connection, rather than 1 thread dealing with all connections in rotation.
+#define VCHI_MULTIPLE_HANDLER_THREADS
+
+// Put free descriptors onto the head of the free queue, rather than the tail, so that we don't thrash
+// our way through the pool of descriptors.
+#define VCHI_PUSH_FREE_DESCRIPTORS_ONTO_HEAD
+
+// Don't issue a MSG_AVAILABLE callback for every single message. Possibly only safe if VCHI_COARSE_LOCKING.
+#define VCHI_FEWER_MSG_AVAILABLE_CALLBACKS
+
+// Don't use message descriptors for TX messages that don't need them
+#define VCHI_MINIMISE_TX_MSG_DESCRIPTORS
+
+// Nano-locks for multiqueue
+//#define VCHI_MQUEUE_NANOLOCKS
+
+// Lock-free(er) dequeuing
+//#define VCHI_RX_NANOLOCKS
+
+#endif /*VCHI_CFG_INTERNAL_H_*/
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchi/vchi_common.h
@@ -0,0 +1,163 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHI_COMMON_H_
+#define VCHI_COMMON_H_
+
+
+//flags used when sending messages (must be bitmapped)
+typedef enum
+{
+   VCHI_FLAGS_NONE                      = 0x0,
+   VCHI_FLAGS_BLOCK_UNTIL_OP_COMPLETE   = 0x1,   // waits for message to be received, or sent (NB. not the same as being seen on other side)
+   VCHI_FLAGS_CALLBACK_WHEN_OP_COMPLETE = 0x2,   // run a callback when message sent
+   VCHI_FLAGS_BLOCK_UNTIL_QUEUED        = 0x4,   // return once the transfer is in a queue ready to go
+   VCHI_FLAGS_ALLOW_PARTIAL             = 0x8,
+   VCHI_FLAGS_BLOCK_UNTIL_DATA_READ     = 0x10,
+   VCHI_FLAGS_CALLBACK_WHEN_DATA_READ   = 0x20,
+
+   VCHI_FLAGS_ALIGN_SLOT            = 0x000080,  // internal use only
+   VCHI_FLAGS_BULK_AUX_QUEUED       = 0x010000,  // internal use only
+   VCHI_FLAGS_BULK_AUX_COMPLETE     = 0x020000,  // internal use only
+   VCHI_FLAGS_BULK_DATA_QUEUED      = 0x040000,  // internal use only
+   VCHI_FLAGS_BULK_DATA_COMPLETE    = 0x080000,  // internal use only
+   VCHI_FLAGS_INTERNAL              = 0xFF0000
+} VCHI_FLAGS_T;
+
+// constants for vchi_crc_control()
+typedef enum {
+   VCHI_CRC_NOTHING = -1,
+   VCHI_CRC_PER_SERVICE = 0,
+   VCHI_CRC_EVERYTHING = 1,
+} VCHI_CRC_CONTROL_T;
+
+//callback reasons when an event occurs on a service
+typedef enum
+{
+   VCHI_CALLBACK_REASON_MIN,
+
+   //This indicates that there is data available
+   //handle is the msg id that was transmitted with the data
+   //    When a message is received and there was no FULL message available previously, send callback
+   //    Tasks get kicked by the callback, reset their event and try and read from the fifo until it fails
+   VCHI_CALLBACK_MSG_AVAILABLE,
+   VCHI_CALLBACK_MSG_SENT,
+   VCHI_CALLBACK_MSG_SPACE_AVAILABLE, // XXX not yet implemented
+
+   // This indicates that a transfer from the other side has completed
+   VCHI_CALLBACK_BULK_RECEIVED,
+   //This indicates that data queued up to be sent has now gone
+   //handle is the msg id that was used when sending the data
+   VCHI_CALLBACK_BULK_SENT,
+   VCHI_CALLBACK_BULK_RX_SPACE_AVAILABLE, // XXX not yet implemented
+   VCHI_CALLBACK_BULK_TX_SPACE_AVAILABLE, // XXX not yet implemented
+
+   VCHI_CALLBACK_SERVICE_CLOSED,
+
+   // this side has sent XOFF to peer due to lack of data consumption by service
+   // (suggests the service may need to take some recovery action if it has
+   // been deliberately holding off consuming data)
+   VCHI_CALLBACK_SENT_XOFF,
+   VCHI_CALLBACK_SENT_XON,
+
+   // indicates that a bulk transfer has finished reading the source buffer
+   VCHI_CALLBACK_BULK_DATA_READ,
+
+   // power notification events (currently host side only)
+   VCHI_CALLBACK_PEER_OFF,
+   VCHI_CALLBACK_PEER_SUSPENDED,
+   VCHI_CALLBACK_PEER_ON,
+   VCHI_CALLBACK_PEER_RESUMED,
+   VCHI_CALLBACK_FORCED_POWER_OFF,
+
+#ifdef USE_VCHIQ_ARM
+   // some extra notifications provided by vchiq_arm
+   VCHI_CALLBACK_SERVICE_OPENED,
+   VCHI_CALLBACK_BULK_RECEIVE_ABORTED,
+   VCHI_CALLBACK_BULK_TRANSMIT_ABORTED,
+#endif
+
+   VCHI_CALLBACK_REASON_MAX
+} VCHI_CALLBACK_REASON_T;
+
+//Calback used by all services / bulk transfers
+typedef void (*VCHI_CALLBACK_T)( void *callback_param, //my service local param
+                                 VCHI_CALLBACK_REASON_T reason,
+                                 void *handle ); //for transmitting msg's only
+
+
+
+/*
+ * Define vector struct for scatter-gather (vector) operations
+ * Vectors can be nested - if a vector element has negative length, then
+ * the data pointer is treated as pointing to another vector array, with
+ * '-vec_len' elements. Thus to append a header onto an existing vector,
+ * you can do this:
+ *
+ * void foo(const VCHI_MSG_VECTOR_T *v, int n)
+ * {
+ *    VCHI_MSG_VECTOR_T nv[2];
+ *    nv[0].vec_base = my_header;
+ *    nv[0].vec_len = sizeof my_header;
+ *    nv[1].vec_base = v;
+ *    nv[1].vec_len = -n;
+ *    ...
+ *
+ */
+typedef struct vchi_msg_vector {
+   const void *vec_base;
+   int32_t vec_len;
+} VCHI_MSG_VECTOR_T;
+
+// Opaque type for a connection API
+typedef struct opaque_vchi_connection_api_t VCHI_CONNECTION_API_T;
+
+// Opaque type for a message driver
+typedef struct opaque_vchi_message_driver_t VCHI_MESSAGE_DRIVER_T;
+
+
+// Iterator structure for reading ahead through received message queue. Allocated by client,
+// initialised by vchi_msg_look_ahead. Fields are for internal VCHI use only.
+// Iterates over messages in queue at the instant of the call to vchi_msg_lookahead -
+// will not proceed to messages received since. Behaviour is undefined if an iterator
+// is used again after messages for that service are removed/dequeued by any
+// means other than vchi_msg_iter_... calls on the iterator itself.
+typedef struct {
+   struct opaque_vchi_service_t *service;
+   void *last;
+   void *next;
+   void *remove;
+} VCHI_MSG_ITER_T;
+
+
+#endif // VCHI_COMMON_H_
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchi/vchi_mh.h
@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHI_MH_H_
+#define VCHI_MH_H_
+
+#include <linux/types.h>
+
+typedef int32_t VCHI_MEM_HANDLE_T;
+#define VCHI_MEM_HANDLE_INVALID 0
+
+#endif
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq.h
@@ -0,0 +1,40 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHIQ_VCHIQ_H
+#define VCHIQ_VCHIQ_H
+
+#include "vchiq_if.h"
+#include "vchiq_util.h"
+
+#endif
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835.h
@@ -0,0 +1,42 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHIQ_2835_H
+#define VCHIQ_2835_H
+
+#include "vchiq_pagelist.h"
+
+#define VCHIQ_PLATFORM_FRAGMENTS_OFFSET_IDX 0
+#define VCHIQ_PLATFORM_FRAGMENTS_COUNT_IDX  1
+
+#endif /* VCHIQ_2835_H */
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
@@ -0,0 +1,561 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/pagemap.h>
+#include <linux/dma-mapping.h>
+#include <linux/version.h>
+#include <linux/io.h>
+#include <linux/uaccess.h>
+#include <asm/pgtable.h>
+
+#include <mach/irqs.h>
+
+#include <mach/platform.h>
+#include <mach/vcio.h>
+
+#define TOTAL_SLOTS (VCHIQ_SLOT_ZERO_SLOTS + 2 * 32)
+
+#define VCHIQ_DOORBELL_IRQ IRQ_ARM_DOORBELL_0
+#define VCHIQ_ARM_ADDRESS(x) ((void *)__virt_to_bus((unsigned)x))
+
+#include "vchiq_arm.h"
+#include "vchiq_2835.h"
+#include "vchiq_connected.h"
+
+#define MAX_FRAGMENTS (VCHIQ_NUM_CURRENT_BULKS * 2)
+
+typedef struct vchiq_2835_state_struct {
+   int inited;
+   VCHIQ_ARM_STATE_T arm_state;
+} VCHIQ_2835_ARM_STATE_T;
+
+static char *g_slot_mem;
+static int g_slot_mem_size;
+dma_addr_t g_slot_phys;
+static FRAGMENTS_T *g_fragments_base;
+static FRAGMENTS_T *g_free_fragments;
+struct semaphore g_free_fragments_sema;
+
+extern int vchiq_arm_log_level;
+
+static DEFINE_SEMAPHORE(g_free_fragments_mutex);
+
+static irqreturn_t
+vchiq_doorbell_irq(int irq, void *dev_id);
+
+static int
+create_pagelist(char __user *buf, size_t count, unsigned short type,
+                struct task_struct *task, PAGELIST_T ** ppagelist);
+
+static void
+free_pagelist(PAGELIST_T *pagelist, int actual);
+
+int __init
+vchiq_platform_init(VCHIQ_STATE_T *state)
+{
+       VCHIQ_SLOT_ZERO_T *vchiq_slot_zero;
+       int frag_mem_size;
+       int err;
+       int i;
+
+       /* Allocate space for the channels in coherent memory */
+       g_slot_mem_size = PAGE_ALIGN(TOTAL_SLOTS * VCHIQ_SLOT_SIZE);
+       frag_mem_size = PAGE_ALIGN(sizeof(FRAGMENTS_T) * MAX_FRAGMENTS);
+
+       g_slot_mem = dma_alloc_coherent(NULL, g_slot_mem_size + frag_mem_size,
+               &g_slot_phys, GFP_ATOMIC);
+
+       if (!g_slot_mem) {
+               vchiq_log_error(vchiq_arm_log_level,
+                       "Unable to allocate channel memory");
+               err = -ENOMEM;
+               goto failed_alloc;
+       }
+
+       WARN_ON(((int)g_slot_mem & (PAGE_SIZE - 1)) != 0);
+
+       vchiq_slot_zero = vchiq_init_slots(g_slot_mem, g_slot_mem_size);
+       if (!vchiq_slot_zero) {
+               err = -EINVAL;
+               goto failed_init_slots;
+       }
+
+       vchiq_slot_zero->platform_data[VCHIQ_PLATFORM_FRAGMENTS_OFFSET_IDX] =
+               (int)g_slot_phys + g_slot_mem_size;
+       vchiq_slot_zero->platform_data[VCHIQ_PLATFORM_FRAGMENTS_COUNT_IDX] =
+               MAX_FRAGMENTS;
+
+       g_fragments_base = (FRAGMENTS_T *)(g_slot_mem + g_slot_mem_size);
+       g_slot_mem_size += frag_mem_size;
+
+       g_free_fragments = g_fragments_base;
+       for (i = 0; i < (MAX_FRAGMENTS - 1); i++) {
+               *(FRAGMENTS_T **)&g_fragments_base[i] =
+                       &g_fragments_base[i + 1];
+       }
+       *(FRAGMENTS_T **)&g_fragments_base[i] = NULL;
+       sema_init(&g_free_fragments_sema, MAX_FRAGMENTS);
+
+       if (vchiq_init_state(state, vchiq_slot_zero, 0/*slave*/) !=
+               VCHIQ_SUCCESS) {
+               err = -EINVAL;
+               goto failed_vchiq_init;
+       }
+
+       err = request_irq(VCHIQ_DOORBELL_IRQ, vchiq_doorbell_irq,
+               IRQF_IRQPOLL, "VCHIQ doorbell",
+               state);
+       if (err < 0) {
+               vchiq_log_error(vchiq_arm_log_level, "%s: failed to register "
+                       "irq=%d err=%d", __func__,
+                       VCHIQ_DOORBELL_IRQ, err);
+               goto failed_request_irq;
+       }
+
+       /* Send the base address of the slots to VideoCore */
+
+       dsb(); /* Ensure all writes have completed */
+
+       bcm_mailbox_write(MBOX_CHAN_VCHIQ, (unsigned int)g_slot_phys);
+
+       vchiq_log_info(vchiq_arm_log_level,
+               "vchiq_init - done (slots %x, phys %x)",
+               (unsigned int)vchiq_slot_zero, g_slot_phys);
+
+   vchiq_call_connected_callbacks();
+
+   return 0;
+
+failed_request_irq:
+failed_vchiq_init:
+failed_init_slots:
+   dma_free_coherent(NULL, g_slot_mem_size, g_slot_mem, g_slot_phys);
+
+failed_alloc:
+   return err;
+}
+
+void __exit
+vchiq_platform_exit(VCHIQ_STATE_T *state)
+{
+   free_irq(VCHIQ_DOORBELL_IRQ, state);
+   dma_free_coherent(NULL, g_slot_mem_size,
+                     g_slot_mem, g_slot_phys);
+}
+
+
+VCHIQ_STATUS_T
+vchiq_platform_init_state(VCHIQ_STATE_T *state)
+{
+   VCHIQ_STATUS_T status = VCHIQ_SUCCESS;
+   state->platform_state = kzalloc(sizeof(VCHIQ_2835_ARM_STATE_T), GFP_KERNEL);
+   ((VCHIQ_2835_ARM_STATE_T*)state->platform_state)->inited = 1;
+   status = vchiq_arm_init_state(state, &((VCHIQ_2835_ARM_STATE_T*)state->platform_state)->arm_state);
+   if(status != VCHIQ_SUCCESS)
+   {
+      ((VCHIQ_2835_ARM_STATE_T*)state->platform_state)->inited = 0;
+   }
+   return status;
+}
+
+VCHIQ_ARM_STATE_T*
+vchiq_platform_get_arm_state(VCHIQ_STATE_T *state)
+{
+   if(!((VCHIQ_2835_ARM_STATE_T*)state->platform_state)->inited)
+   {
+      BUG();
+   }
+   return &((VCHIQ_2835_ARM_STATE_T*)state->platform_state)->arm_state;
+}
+
+void
+remote_event_signal(REMOTE_EVENT_T *event)
+{
+       wmb();
+
+       event->fired = 1;
+
+       dsb();         /* data barrier operation */
+
+       if (event->armed) {
+               /* trigger vc interrupt */
+
+               writel(0, __io_address(ARM_0_BELL2));
+       }
+}
+
+int
+vchiq_copy_from_user(void *dst, const void *src, int size)
+{
+       if ((uint32_t)src < TASK_SIZE) {
+               return copy_from_user(dst, src, size);
+       } else {
+               memcpy(dst, src, size);
+               return 0;
+       }
+}
+
+VCHIQ_STATUS_T
+vchiq_prepare_bulk_data(VCHIQ_BULK_T *bulk, VCHI_MEM_HANDLE_T memhandle,
+       void *offset, int size, int dir)
+{
+       PAGELIST_T *pagelist;
+       int ret;
+
+       WARN_ON(memhandle != VCHI_MEM_HANDLE_INVALID);
+
+       ret = create_pagelist((char __user *)offset, size,
+                       (dir == VCHIQ_BULK_RECEIVE)
+                       ? PAGELIST_READ
+                       : PAGELIST_WRITE,
+                       current,
+                       &pagelist);
+       if (ret != 0)
+               return VCHIQ_ERROR;
+
+       bulk->handle = memhandle;
+       bulk->data = VCHIQ_ARM_ADDRESS(pagelist);
+
+       /* Store the pagelist address in remote_data, which isn't used by the
+          slave. */
+       bulk->remote_data = pagelist;
+
+       return VCHIQ_SUCCESS;
+}
+
+void
+vchiq_complete_bulk(VCHIQ_BULK_T *bulk)
+{
+       if (bulk && bulk->remote_data && bulk->actual)
+               free_pagelist((PAGELIST_T *)bulk->remote_data, bulk->actual);
+}
+
+void
+vchiq_transfer_bulk(VCHIQ_BULK_T *bulk)
+{
+       /*
+        * This should only be called on the master (VideoCore) side, but
+        * provide an implementation to avoid the need for ifdefery.
+        */
+       BUG();
+}
+
+void
+vchiq_dump_platform_state(void *dump_context)
+{
+       char buf[80];
+       int len;
+       len = snprintf(buf, sizeof(buf),
+               "  Platform: 2835 (VC master)");
+       vchiq_dump(dump_context, buf, len + 1);
+}
+
+VCHIQ_STATUS_T
+vchiq_platform_suspend(VCHIQ_STATE_T *state)
+{
+   return VCHIQ_ERROR;
+}
+
+VCHIQ_STATUS_T
+vchiq_platform_resume(VCHIQ_STATE_T *state)
+{
+   return VCHIQ_SUCCESS;
+}
+
+void
+vchiq_platform_paused(VCHIQ_STATE_T *state)
+{
+}
+
+void
+vchiq_platform_resumed(VCHIQ_STATE_T *state)
+{
+}
+
+int
+vchiq_platform_videocore_wanted(VCHIQ_STATE_T* state)
+{
+   return 1; // autosuspend not supported - videocore always wanted
+}
+
+int
+vchiq_platform_use_suspend_timer(void)
+{
+   return 0;
+}
+void
+vchiq_dump_platform_use_state(VCHIQ_STATE_T *state)
+{
+       vchiq_log_info((vchiq_arm_log_level>=VCHIQ_LOG_INFO),"Suspend timer not in use");
+}
+void
+vchiq_platform_handle_timeout(VCHIQ_STATE_T *state)
+{
+       (void)state;
+}
+/*
+ * Local functions
+ */
+
+static irqreturn_t
+vchiq_doorbell_irq(int irq, void *dev_id)
+{
+       VCHIQ_STATE_T *state = dev_id;
+       irqreturn_t ret = IRQ_NONE;
+       unsigned int status;
+
+       /* Read (and clear) the doorbell */
+       status = readl(__io_address(ARM_0_BELL0));
+
+       if (status & 0x4) {  /* Was the doorbell rung? */
+               remote_event_pollall(state);
+               ret = IRQ_HANDLED;
+       }
+
+       return ret;
+}
+
+/* There is a potential problem with partial cache lines (pages?)
+** at the ends of the block when reading. If the CPU accessed anything in
+** the same line (page?) then it may have pulled old data into the cache,
+** obscuring the new data underneath. We can solve this by transferring the
+** partial cache lines separately, and allowing the ARM to copy into the
+** cached area.
+
+** N.B. This implementation plays slightly fast and loose with the Linux
+** driver programming rules, e.g. its use of __virt_to_bus instead of
+** dma_map_single, but it isn't a multi-platform driver and it benefits
+** from increased speed as a result.
+*/
+
+static int
+create_pagelist(char __user *buf, size_t count, unsigned short type,
+       struct task_struct *task, PAGELIST_T ** ppagelist)
+{
+       PAGELIST_T *pagelist;
+       struct page **pages;
+       struct page *page;
+       unsigned long *addrs;
+       unsigned int num_pages, offset, i;
+       char *addr, *base_addr, *next_addr;
+       int run, addridx, actual_pages;
+        unsigned long *need_release;
+
+       offset = (unsigned int)buf & (PAGE_SIZE - 1);
+       num_pages = (count + offset + PAGE_SIZE - 1) / PAGE_SIZE;
+
+       *ppagelist = NULL;
+
+       /* Allocate enough storage to hold the page pointers and the page
+       ** list
+       */
+       pagelist = kmalloc(sizeof(PAGELIST_T) +
+                           (num_pages * sizeof(unsigned long)) +
+                           sizeof(unsigned long) +
+                           (num_pages * sizeof(pages[0])),
+                           GFP_KERNEL);
+
+       vchiq_log_trace(vchiq_arm_log_level,
+               "create_pagelist - %x", (unsigned int)pagelist);
+       if (!pagelist)
+               return -ENOMEM;
+
+       addrs = pagelist->addrs;
+        need_release = (unsigned long *)(addrs + num_pages);
+       pages = (struct page **)(addrs + num_pages + 1);
+
+       if (is_vmalloc_addr(buf)) {
+               for (actual_pages = 0; actual_pages < num_pages; actual_pages++) {
+                       pages[actual_pages] = vmalloc_to_page(buf + (actual_pages * PAGE_SIZE));
+               }
+                *need_release = 0; /* do not try and release vmalloc pages */
+       } else {
+               down_read(&task->mm->mmap_sem);
+               actual_pages = get_user_pages(task, task->mm,
+                                         (unsigned long)buf & ~(PAGE_SIZE - 1),
+                                         num_pages,
+                                         (type == PAGELIST_READ) /*Write */ ,
+                                         0 /*Force */ ,
+                                         pages,
+                                         NULL /*vmas */);
+               up_read(&task->mm->mmap_sem);
+
+               if (actual_pages != num_pages) {
+                       vchiq_log_info(vchiq_arm_log_level,
+                                      "create_pagelist - only %d/%d pages locked",
+                                      actual_pages,
+                                      num_pages);
+
+                       /* This is probably due to the process being killed */
+                       while (actual_pages > 0)
+                       {
+                               actual_pages--;
+                               page_cache_release(pages[actual_pages]);
+                       }
+                       kfree(pagelist);
+                       if (actual_pages == 0)
+                               actual_pages = -ENOMEM;
+                       return actual_pages;
+               }
+                *need_release = 1; /* release user pages */
+       }
+
+       pagelist->length = count;
+       pagelist->type = type;
+       pagelist->offset = offset;
+
+       /* Group the pages into runs of contiguous pages */
+
+       base_addr = VCHIQ_ARM_ADDRESS(page_address(pages[0]));
+       next_addr = base_addr + PAGE_SIZE;
+       addridx = 0;
+       run = 0;
+
+       for (i = 1; i < num_pages; i++) {
+               addr = VCHIQ_ARM_ADDRESS(page_address(pages[i]));
+               if ((addr == next_addr) && (run < (PAGE_SIZE - 1))) {
+                       next_addr += PAGE_SIZE;
+                       run++;
+               } else {
+                       addrs[addridx] = (unsigned long)base_addr + run;
+                       addridx++;
+                       base_addr = addr;
+                       next_addr = addr + PAGE_SIZE;
+                       run = 0;
+               }
+       }
+
+       addrs[addridx] = (unsigned long)base_addr + run;
+       addridx++;
+
+       /* Partial cache lines (fragments) require special measures */
+       if ((type == PAGELIST_READ) &&
+               ((pagelist->offset & (CACHE_LINE_SIZE - 1)) ||
+               ((pagelist->offset + pagelist->length) &
+               (CACHE_LINE_SIZE - 1)))) {
+               FRAGMENTS_T *fragments;
+
+               if (down_interruptible(&g_free_fragments_sema) != 0) {
+                       kfree(pagelist);
+                       return -EINTR;
+               }
+
+               WARN_ON(g_free_fragments == NULL);
+
+               down(&g_free_fragments_mutex);
+               fragments = (FRAGMENTS_T *) g_free_fragments;
+               WARN_ON(fragments == NULL);
+               g_free_fragments = *(FRAGMENTS_T **) g_free_fragments;
+               up(&g_free_fragments_mutex);
+               pagelist->type =
+                        PAGELIST_READ_WITH_FRAGMENTS + (fragments -
+                                                        g_fragments_base);
+       }
+
+       for (page = virt_to_page(pagelist);
+               page <= virt_to_page(addrs + num_pages - 1); page++) {
+               flush_dcache_page(page);
+       }
+
+       *ppagelist = pagelist;
+
+       return 0;
+}
+
+static void
+free_pagelist(PAGELIST_T *pagelist, int actual)
+{
+        unsigned long *need_release;
+       struct page **pages;
+       unsigned int num_pages, i;
+
+       vchiq_log_trace(vchiq_arm_log_level,
+               "free_pagelist - %x, %d", (unsigned int)pagelist, actual);
+
+       num_pages =
+               (pagelist->length + pagelist->offset + PAGE_SIZE - 1) /
+               PAGE_SIZE;
+
+        need_release = (unsigned long *)(pagelist->addrs + num_pages);
+       pages = (struct page **)(pagelist->addrs + num_pages + 1);
+
+       /* Deal with any partial cache lines (fragments) */
+       if (pagelist->type >= PAGELIST_READ_WITH_FRAGMENTS) {
+               FRAGMENTS_T *fragments = g_fragments_base +
+                       (pagelist->type - PAGELIST_READ_WITH_FRAGMENTS);
+               int head_bytes, tail_bytes;
+               head_bytes = (CACHE_LINE_SIZE - pagelist->offset) &
+                       (CACHE_LINE_SIZE - 1);
+               tail_bytes = (pagelist->offset + actual) &
+                       (CACHE_LINE_SIZE - 1);
+
+               if ((actual >= 0) && (head_bytes != 0)) {
+                       if (head_bytes > actual)
+                               head_bytes = actual;
+
+                       memcpy((char *)page_address(pages[0]) +
+                               pagelist->offset,
+                               fragments->headbuf,
+                               head_bytes);
+               }
+               if ((actual >= 0) && (head_bytes < actual) &&
+                       (tail_bytes != 0)) {
+                       memcpy((char *)page_address(pages[num_pages - 1]) +
+                               ((pagelist->offset + actual) &
+                               (PAGE_SIZE - 1) & ~(CACHE_LINE_SIZE - 1)),
+                               fragments->tailbuf, tail_bytes);
+               }
+
+               down(&g_free_fragments_mutex);
+               *(FRAGMENTS_T **) fragments = g_free_fragments;
+               g_free_fragments = fragments;
+               up(&g_free_fragments_mutex);
+               up(&g_free_fragments_sema);
+       }
+
+        if (*need_release) {
+               for (i = 0; i < num_pages; i++) {
+                       if (pagelist->type != PAGELIST_WRITE)
+                               set_page_dirty(pages[i]);
+
+                       page_cache_release(pages[i]);
+               }
+        }
+
+       kfree(pagelist);
+}
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -0,0 +1,2813 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/cdev.h>
+#include <linux/fs.h>
+#include <linux/device.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/pagemap.h>
+#include <linux/bug.h>
+#include <linux/semaphore.h>
+#include <linux/list.h>
+#include <linux/proc_fs.h>
+
+#include "vchiq_core.h"
+#include "vchiq_ioctl.h"
+#include "vchiq_arm.h"
+
+#define DEVICE_NAME "vchiq"
+
+/* Override the default prefix, which would be vchiq_arm (from the filename) */
+#undef MODULE_PARAM_PREFIX
+#define MODULE_PARAM_PREFIX DEVICE_NAME "."
+
+#define VCHIQ_MINOR 0
+
+/* Some per-instance constants */
+#define MAX_COMPLETIONS 16
+#define MAX_SERVICES 64
+#define MAX_ELEMENTS 8
+#define MSG_QUEUE_SIZE 64
+
+#define KEEPALIVE_VER 1
+#define KEEPALIVE_VER_MIN KEEPALIVE_VER
+
+/* Run time control of log level, based on KERN_XXX level. */
+int vchiq_arm_log_level = VCHIQ_LOG_DEFAULT;
+int vchiq_susp_log_level = VCHIQ_LOG_ERROR;
+
+#define SUSPEND_TIMER_TIMEOUT_MS 100
+#define SUSPEND_RETRY_TIMER_TIMEOUT_MS 1000
+
+#define VC_SUSPEND_NUM_OFFSET 3 /* number of values before idle which are -ve */
+static const char *const suspend_state_names[] = {
+       "VC_SUSPEND_FORCE_CANCELED",
+       "VC_SUSPEND_REJECTED",
+       "VC_SUSPEND_FAILED",
+       "VC_SUSPEND_IDLE",
+       "VC_SUSPEND_REQUESTED",
+       "VC_SUSPEND_IN_PROGRESS",
+       "VC_SUSPEND_SUSPENDED"
+};
+#define VC_RESUME_NUM_OFFSET 1 /* number of values before idle which are -ve */
+static const char *const resume_state_names[] = {
+       "VC_RESUME_FAILED",
+       "VC_RESUME_IDLE",
+       "VC_RESUME_REQUESTED",
+       "VC_RESUME_IN_PROGRESS",
+       "VC_RESUME_RESUMED"
+};
+/* The number of times we allow force suspend to timeout before actually
+** _forcing_ suspend.  This is to cater for SW which fails to release vchiq
+** correctly - we don't want to prevent ARM suspend indefinitely in this case.
+*/
+#define FORCE_SUSPEND_FAIL_MAX 8
+
+/* The time in ms allowed for videocore to go idle when force suspend has been
+ * requested */
+#define FORCE_SUSPEND_TIMEOUT_MS 200
+
+
+static void suspend_timer_callback(unsigned long context);
+static int vchiq_proc_add_instance(VCHIQ_INSTANCE_T instance);
+static void vchiq_proc_remove_instance(VCHIQ_INSTANCE_T instance);
+
+
+typedef struct user_service_struct {
+       VCHIQ_SERVICE_T *service;
+       void *userdata;
+       VCHIQ_INSTANCE_T instance;
+       int is_vchi;
+       int dequeue_pending;
+       int message_available_pos;
+       int msg_insert;
+       int msg_remove;
+       struct semaphore insert_event;
+       struct semaphore remove_event;
+       VCHIQ_HEADER_T * msg_queue[MSG_QUEUE_SIZE];
+} USER_SERVICE_T;
+
+struct bulk_waiter_node {
+       struct bulk_waiter bulk_waiter;
+       int pid;
+       struct list_head list;
+};
+
+struct vchiq_instance_struct {
+       VCHIQ_STATE_T *state;
+       VCHIQ_COMPLETION_DATA_T completions[MAX_COMPLETIONS];
+       int completion_insert;
+       int completion_remove;
+       struct semaphore insert_event;
+       struct semaphore remove_event;
+       struct mutex completion_mutex;
+
+       int connected;
+       int closing;
+       int pid;
+       int mark;
+
+       struct list_head bulk_waiter_list;
+       struct mutex bulk_waiter_list_mutex;
+
+       struct proc_dir_entry *proc_entry;
+};
+
+typedef struct dump_context_struct {
+       char __user *buf;
+       size_t actual;
+       size_t space;
+       loff_t offset;
+} DUMP_CONTEXT_T;
+
+static struct cdev    vchiq_cdev;
+static dev_t          vchiq_devid;
+static VCHIQ_STATE_T g_state;
+static struct class  *vchiq_class;
+static struct device *vchiq_dev;
+static DEFINE_SPINLOCK(msg_queue_spinlock);
+
+static const char *const ioctl_names[] = {
+       "CONNECT",
+       "SHUTDOWN",
+       "CREATE_SERVICE",
+       "REMOVE_SERVICE",
+       "QUEUE_MESSAGE",
+       "QUEUE_BULK_TRANSMIT",
+       "QUEUE_BULK_RECEIVE",
+       "AWAIT_COMPLETION",
+       "DEQUEUE_MESSAGE",
+       "GET_CLIENT_ID",
+       "GET_CONFIG",
+       "CLOSE_SERVICE",
+       "USE_SERVICE",
+       "RELEASE_SERVICE",
+       "SET_SERVICE_OPTION",
+       "DUMP_PHYS_MEM"
+};
+
+vchiq_static_assert((sizeof(ioctl_names)/sizeof(ioctl_names[0])) ==
+       (VCHIQ_IOC_MAX + 1));
+
+static void
+dump_phys_mem(void *virt_addr, uint32_t num_bytes);
+
+/****************************************************************************
+*
+*   add_completion
+*
+***************************************************************************/
+
+static VCHIQ_STATUS_T
+add_completion(VCHIQ_INSTANCE_T instance, VCHIQ_REASON_T reason,
+       VCHIQ_HEADER_T *header, USER_SERVICE_T *user_service,
+       void *bulk_userdata)
+{
+       VCHIQ_COMPLETION_DATA_T *completion;
+       DEBUG_INITIALISE(g_state.local)
+
+       while (instance->completion_insert ==
+               (instance->completion_remove + MAX_COMPLETIONS)) {
+               /* Out of space - wait for the client */
+               DEBUG_TRACE(SERVICE_CALLBACK_LINE);
+               vchiq_log_trace(vchiq_arm_log_level,
+                       "add_completion - completion queue full");
+               DEBUG_COUNT(COMPLETION_QUEUE_FULL_COUNT);
+               if (down_interruptible(&instance->remove_event) != 0) {
+                       vchiq_log_info(vchiq_arm_log_level,
+                               "service_callback interrupted");
+                       return VCHIQ_RETRY;
+               } else if (instance->closing) {
+                       vchiq_log_info(vchiq_arm_log_level,
+                               "service_callback closing");
+                       return VCHIQ_ERROR;
+               }
+               DEBUG_TRACE(SERVICE_CALLBACK_LINE);
+       }
+
+       completion =
+                &instance->completions[instance->completion_insert &
+                (MAX_COMPLETIONS - 1)];
+
+       completion->header = header;
+       completion->reason = reason;
+       /* N.B. service_userdata is updated while processing AWAIT_COMPLETION */
+       completion->service_userdata = user_service->service;
+       completion->bulk_userdata = bulk_userdata;
+
+       if (reason == VCHIQ_SERVICE_CLOSED)
+               /* Take an extra reference, to be held until
+                  this CLOSED notification is delivered. */
+               lock_service(user_service->service);
+
+       /* A write barrier is needed here to ensure that the entire completion
+               record is written out before the insert point. */
+       wmb();
+
+       if (reason == VCHIQ_MESSAGE_AVAILABLE)
+               user_service->message_available_pos =
+                       instance->completion_insert;
+       instance->completion_insert++;
+
+       up(&instance->insert_event);
+
+       return VCHIQ_SUCCESS;
+}
+
+/****************************************************************************
+*
+*   service_callback
+*
+***************************************************************************/
+
+static VCHIQ_STATUS_T
+service_callback(VCHIQ_REASON_T reason, VCHIQ_HEADER_T *header,
+       VCHIQ_SERVICE_HANDLE_T handle, void *bulk_userdata)
+{
+       /* How do we ensure the callback goes to the right client?
+       ** The service_user data points to a USER_SERVICE_T record containing
+       ** the original callback and the user state structure, which contains a
+       ** circular buffer for completion records.
+       */
+       USER_SERVICE_T *user_service;
+       VCHIQ_SERVICE_T *service;
+       VCHIQ_INSTANCE_T instance;
+       DEBUG_INITIALISE(g_state.local)
+
+       DEBUG_TRACE(SERVICE_CALLBACK_LINE);
+
+       service = handle_to_service(handle);
+       BUG_ON(!service);
+       user_service = (USER_SERVICE_T *)service->base.userdata;
+       instance = user_service->instance;
+
+       if (!instance || instance->closing)
+               return VCHIQ_SUCCESS;
+
+       vchiq_log_trace(vchiq_arm_log_level,
+               "service_callback - service %lx(%d), reason %d, header %lx, "
+               "instance %lx, bulk_userdata %lx",
+               (unsigned long)user_service,
+               service->localport,
+               reason, (unsigned long)header,
+               (unsigned long)instance, (unsigned long)bulk_userdata);
+
+       if (header && user_service->is_vchi) {
+               spin_lock(&msg_queue_spinlock);
+               while (user_service->msg_insert ==
+                       (user_service->msg_remove + MSG_QUEUE_SIZE)) {
+                       spin_unlock(&msg_queue_spinlock);
+                       DEBUG_TRACE(SERVICE_CALLBACK_LINE);
+                       DEBUG_COUNT(MSG_QUEUE_FULL_COUNT);
+                       vchiq_log_trace(vchiq_arm_log_level,
+                               "service_callback - msg queue full");
+                       /* If there is no MESSAGE_AVAILABLE in the completion
+                       ** queue, add one
+                       */
+                       if ((user_service->message_available_pos -
+                               instance->completion_remove) < 0) {
+                               VCHIQ_STATUS_T status;
+                               vchiq_log_info(vchiq_arm_log_level,
+                                       "Inserting extra MESSAGE_AVAILABLE");
+                               DEBUG_TRACE(SERVICE_CALLBACK_LINE);
+                               status = add_completion(instance, reason,
+                                       NULL, user_service, bulk_userdata);
+                               if (status != VCHIQ_SUCCESS) {
+                                       DEBUG_TRACE(SERVICE_CALLBACK_LINE);
+                                       return status;
+                               }
+                       }
+
+                       DEBUG_TRACE(SERVICE_CALLBACK_LINE);
+                       if (down_interruptible(&user_service->remove_event)
+                               != 0) {
+                               vchiq_log_info(vchiq_arm_log_level,
+                                       "service_callback interrupted");
+                               DEBUG_TRACE(SERVICE_CALLBACK_LINE);
+                               return VCHIQ_RETRY;
+                       } else if (instance->closing) {
+                               vchiq_log_info(vchiq_arm_log_level,
+                                       "service_callback closing");
+                               DEBUG_TRACE(SERVICE_CALLBACK_LINE);
+                               return VCHIQ_ERROR;
+                       }
+                       DEBUG_TRACE(SERVICE_CALLBACK_LINE);
+                       spin_lock(&msg_queue_spinlock);
+               }
+
+               user_service->msg_queue[user_service->msg_insert &
+                       (MSG_QUEUE_SIZE - 1)] = header;
+               user_service->msg_insert++;
+               spin_unlock(&msg_queue_spinlock);
+
+               up(&user_service->insert_event);
+
+               /* If there is a thread waiting in DEQUEUE_MESSAGE, or if
+               ** there is a MESSAGE_AVAILABLE in the completion queue then
+               ** bypass the completion queue.
+               */
+               if (((user_service->message_available_pos -
+                       instance->completion_remove) >= 0) ||
+                       user_service->dequeue_pending) {
+                       DEBUG_TRACE(SERVICE_CALLBACK_LINE);
+                       user_service->dequeue_pending = 0;
+                       return VCHIQ_SUCCESS;
+               }
+
+               header = NULL;
+       }
+       DEBUG_TRACE(SERVICE_CALLBACK_LINE);
+
+       return add_completion(instance, reason, header, user_service,
+               bulk_userdata);
+}
+
+/****************************************************************************
+*
+*   user_service_free
+*
+***************************************************************************/
+static void
+user_service_free(void *userdata)
+{
+       kfree(userdata);
+}
+
+/****************************************************************************
+*
+*   vchiq_ioctl
+*
+***************************************************************************/
+
+static long
+vchiq_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
+{
+       VCHIQ_INSTANCE_T instance = file->private_data;
+       VCHIQ_STATUS_T status = VCHIQ_SUCCESS;
+       VCHIQ_SERVICE_T *service = NULL;
+       long ret = 0;
+       int i, rc;
+       DEBUG_INITIALISE(g_state.local)
+
+       vchiq_log_trace(vchiq_arm_log_level,
+                "vchiq_ioctl - instance %x, cmd %s, arg %lx",
+               (unsigned int)instance,
+               ((_IOC_TYPE(cmd) == VCHIQ_IOC_MAGIC) &&
+               (_IOC_NR(cmd) <= VCHIQ_IOC_MAX)) ?
+               ioctl_names[_IOC_NR(cmd)] : "<invalid>", arg);
+
+       switch (cmd) {
+       case VCHIQ_IOC_SHUTDOWN:
+               if (!instance->connected)
+                       break;
+
+               /* Remove all services */
+               i = 0;
+               while ((service = next_service_by_instance(instance->state,
+                       instance, &i)) != NULL) {
+                       status = vchiq_remove_service(service->handle);
+                       unlock_service(service);
+                       if (status != VCHIQ_SUCCESS)
+                               break;
+               }
+               service = NULL;
+
+               if (status == VCHIQ_SUCCESS) {
+                       /* Wake the completion thread and ask it to exit */
+                       instance->closing = 1;
+                       up(&instance->insert_event);
+               }
+
+               break;
+
+       case VCHIQ_IOC_CONNECT:
+               if (instance->connected) {
+                       ret = -EINVAL;
+                       break;
+               }
+               rc = mutex_lock_interruptible(&instance->state->mutex);
+               if (rc != 0) {
+                       vchiq_log_error(vchiq_arm_log_level,
+                               "vchiq: connect: could not lock mutex for "
+                               "state %d: %d",
+                               instance->state->id, rc);
+                       ret = -EINTR;
+                       break;
+               }
+               status = vchiq_connect_internal(instance->state, instance);
+               mutex_unlock(&instance->state->mutex);
+
+               if (status == VCHIQ_SUCCESS)
+                       instance->connected = 1;
+               else
+                       vchiq_log_error(vchiq_arm_log_level,
+                               "vchiq: could not connect: %d", status);
+               break;
+
+       case VCHIQ_IOC_CREATE_SERVICE: {
+               VCHIQ_CREATE_SERVICE_T args;
+               USER_SERVICE_T *user_service = NULL;
+               void *userdata;
+               int srvstate;
+
+               if (copy_from_user
+                        (&args, (const void __user *)arg,
+                         sizeof(args)) != 0) {
+                       ret = -EFAULT;
+                       break;
+               }
+
+               user_service = kmalloc(sizeof(USER_SERVICE_T), GFP_KERNEL);
+               if (!user_service) {
+                       ret = -ENOMEM;
+                       break;
+               }
+
+               if (args.is_open) {
+                       if (!instance->connected) {
+                               ret = -ENOTCONN;
+                               kfree(user_service);
+                               break;
+                       }
+                       srvstate = VCHIQ_SRVSTATE_OPENING;
+               } else {
+                       srvstate =
+                                instance->connected ?
+                                VCHIQ_SRVSTATE_LISTENING :
+                                VCHIQ_SRVSTATE_HIDDEN;
+               }
+
+               userdata = args.params.userdata;
+               args.params.callback = service_callback;
+               args.params.userdata = user_service;
+               service = vchiq_add_service_internal(
+                               instance->state,
+                               &args.params, srvstate,
+                               instance, user_service_free);
+
+               if (service != NULL) {
+                       user_service->service = service;
+                       user_service->userdata = userdata;
+                       user_service->instance = instance;
+                       user_service->is_vchi = args.is_vchi;
+                       user_service->dequeue_pending = 0;
+                       user_service->message_available_pos =
+                               instance->completion_remove - 1;
+                       user_service->msg_insert = 0;
+                       user_service->msg_remove = 0;
+                       sema_init(&user_service->insert_event, 0);
+                       sema_init(&user_service->remove_event, 0);
+
+                       if (args.is_open) {
+                               status = vchiq_open_service_internal
+                                       (service, instance->pid);
+                               if (status != VCHIQ_SUCCESS) {
+                                       vchiq_remove_service(service->handle);
+                                       service = NULL;
+                                       ret = (status == VCHIQ_RETRY) ?
+                                               -EINTR : -EIO;
+                                       break;
+                               }
+                       }
+
+                       if (copy_to_user((void __user *)
+                               &(((VCHIQ_CREATE_SERVICE_T __user *)
+                                       arg)->handle),
+                               (const void *)&service->handle,
+                               sizeof(service->handle)) != 0) {
+                               ret = -EFAULT;
+                               vchiq_remove_service(service->handle);
+                       }
+
+                       service = NULL;
+               } else {
+                       ret = -EEXIST;
+                       kfree(user_service);
+               }
+       } break;
+
+       case VCHIQ_IOC_CLOSE_SERVICE: {
+               VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg;
+
+               service = find_service_for_instance(instance, handle);
+               if (service != NULL)
+                       status = vchiq_close_service(service->handle);
+               else
+                       ret = -EINVAL;
+       } break;
+
+       case VCHIQ_IOC_REMOVE_SERVICE: {
+               VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg;
+
+               service = find_service_for_instance(instance, handle);
+               if (service != NULL)
+                       status = vchiq_remove_service(service->handle);
+               else
+                       ret = -EINVAL;
+       } break;
+
+       case VCHIQ_IOC_USE_SERVICE:
+       case VCHIQ_IOC_RELEASE_SERVICE: {
+               VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg;
+
+               service = find_service_for_instance(instance, handle);
+               if (service != NULL) {
+                       status = (cmd == VCHIQ_IOC_USE_SERVICE) ?
+                               vchiq_use_service_internal(service) :
+                               vchiq_release_service_internal(service);
+                       if (status != VCHIQ_SUCCESS) {
+                               vchiq_log_error(vchiq_susp_log_level,
+                                       "%s: cmd %s returned error %d for "
+                                       "service %c%c%c%c:%03d",
+                                       __func__,
+                                       (cmd == VCHIQ_IOC_USE_SERVICE) ?
+                                               "VCHIQ_IOC_USE_SERVICE" :
+                                               "VCHIQ_IOC_RELEASE_SERVICE",
+                                       status,
+                                       VCHIQ_FOURCC_AS_4CHARS(
+                                               service->base.fourcc),
+                                       service->client_id);
+                               ret = -EINVAL;
+                       }
+               } else
+                       ret = -EINVAL;
+       } break;
+
+       case VCHIQ_IOC_QUEUE_MESSAGE: {
+               VCHIQ_QUEUE_MESSAGE_T args;
+               if (copy_from_user
+                        (&args, (const void __user *)arg,
+                         sizeof(args)) != 0) {
+                       ret = -EFAULT;
+                       break;
+               }
+
+               service = find_service_for_instance(instance, args.handle);
+
+               if ((service != NULL) && (args.count <= MAX_ELEMENTS)) {
+                       /* Copy elements into kernel space */
+                       VCHIQ_ELEMENT_T elements[MAX_ELEMENTS];
+                       if (copy_from_user(elements, args.elements,
+                               args.count * sizeof(VCHIQ_ELEMENT_T)) == 0)
+                               status = vchiq_queue_message
+                                       (args.handle,
+                                       elements, args.count);
+                       else
+                               ret = -EFAULT;
+               } else {
+                       ret = -EINVAL;
+               }
+       } break;
+
+       case VCHIQ_IOC_QUEUE_BULK_TRANSMIT:
+       case VCHIQ_IOC_QUEUE_BULK_RECEIVE: {
+               VCHIQ_QUEUE_BULK_TRANSFER_T args;
+               struct bulk_waiter_node *waiter = NULL;
+               VCHIQ_BULK_DIR_T dir =
+                       (cmd == VCHIQ_IOC_QUEUE_BULK_TRANSMIT) ?
+                       VCHIQ_BULK_TRANSMIT : VCHIQ_BULK_RECEIVE;
+
+               if (copy_from_user
+                       (&args, (const void __user *)arg,
+                       sizeof(args)) != 0) {
+                       ret = -EFAULT;
+                       break;
+               }
+
+               service = find_service_for_instance(instance, args.handle);
+               if (!service) {
+                       ret = -EINVAL;
+                       break;
+               }
+
+               if (args.mode == VCHIQ_BULK_MODE_BLOCKING) {
+                       waiter = kzalloc(sizeof(struct bulk_waiter_node),
+                               GFP_KERNEL);
+                       if (!waiter) {
+                               ret = -ENOMEM;
+                               break;
+                       }
+                       args.userdata = &waiter->bulk_waiter;
+               } else if (args.mode == VCHIQ_BULK_MODE_WAITING) {
+                       struct list_head *pos;
+                       mutex_lock(&instance->bulk_waiter_list_mutex);
+                       list_for_each(pos, &instance->bulk_waiter_list) {
+                               if (list_entry(pos, struct bulk_waiter_node,
+                                       list)->pid == current->pid) {
+                                       waiter = list_entry(pos,
+                                               struct bulk_waiter_node,
+                                               list);
+                                       list_del(pos);
+                                       break;
+                               }
+
+                       }
+                       mutex_unlock(&instance->bulk_waiter_list_mutex);
+                       if (!waiter) {
+                               vchiq_log_error(vchiq_arm_log_level,
+                                       "no bulk_waiter found for pid %d",
+                                       current->pid);
+                               ret = -ESRCH;
+                               break;
+                       }
+                       vchiq_log_info(vchiq_arm_log_level,
+                               "found bulk_waiter %x for pid %d",
+                               (unsigned int)waiter, current->pid);
+                       args.userdata = &waiter->bulk_waiter;
+               }
+               status = vchiq_bulk_transfer
+                       (args.handle,
+                        VCHI_MEM_HANDLE_INVALID,
+                        args.data, args.size,
+                        args.userdata, args.mode,
+                        dir);
+               if (!waiter)
+                       break;
+               if ((status != VCHIQ_RETRY) || fatal_signal_pending(current) ||
+                       !waiter->bulk_waiter.bulk) {
+                       if (waiter->bulk_waiter.bulk) {
+                               /* Cancel the signal when the transfer
+                               ** completes. */
+                               spin_lock(&bulk_waiter_spinlock);
+                               waiter->bulk_waiter.bulk->userdata = NULL;
+                               spin_unlock(&bulk_waiter_spinlock);
+                       }
+                       kfree(waiter);
+               } else {
+                       const VCHIQ_BULK_MODE_T mode_waiting =
+                               VCHIQ_BULK_MODE_WAITING;
+                       waiter->pid = current->pid;
+                       mutex_lock(&instance->bulk_waiter_list_mutex);
+                       list_add(&waiter->list, &instance->bulk_waiter_list);
+                       mutex_unlock(&instance->bulk_waiter_list_mutex);
+                       vchiq_log_info(vchiq_arm_log_level,
+                               "saved bulk_waiter %x for pid %d",
+                               (unsigned int)waiter, current->pid);
+
+                       if (copy_to_user((void __user *)
+                               &(((VCHIQ_QUEUE_BULK_TRANSFER_T __user *)
+                                       arg)->mode),
+                               (const void *)&mode_waiting,
+                               sizeof(mode_waiting)) != 0)
+                               ret = -EFAULT;
+               }
+       } break;
+
+       case VCHIQ_IOC_AWAIT_COMPLETION: {
+               VCHIQ_AWAIT_COMPLETION_T args;
+
+               DEBUG_TRACE(AWAIT_COMPLETION_LINE);
+               if (!instance->connected) {
+                       ret = -ENOTCONN;
+                       break;
+               }
+
+               if (copy_from_user(&args, (const void __user *)arg,
+                       sizeof(args)) != 0) {
+                       ret = -EFAULT;
+                       break;
+               }
+
+               mutex_lock(&instance->completion_mutex);
+
+               DEBUG_TRACE(AWAIT_COMPLETION_LINE);
+               while ((instance->completion_remove ==
+                       instance->completion_insert)
+                       && !instance->closing) {
+                       int rc;
+                       DEBUG_TRACE(AWAIT_COMPLETION_LINE);
+                       mutex_unlock(&instance->completion_mutex);
+                       rc = down_interruptible(&instance->insert_event);
+                       mutex_lock(&instance->completion_mutex);
+                       if (rc != 0) {
+                               DEBUG_TRACE(AWAIT_COMPLETION_LINE);
+                               vchiq_log_info(vchiq_arm_log_level,
+                                       "AWAIT_COMPLETION interrupted");
+                               ret = -EINTR;
+                               break;
+                       }
+               }
+               DEBUG_TRACE(AWAIT_COMPLETION_LINE);
+
+               /* A read memory barrier is needed to stop prefetch of a stale
+               ** completion record
+               */
+               rmb();
+
+               if (ret == 0) {
+                       int msgbufcount = args.msgbufcount;
+                       for (ret = 0; ret < args.count; ret++) {
+                               VCHIQ_COMPLETION_DATA_T *completion;
+                               VCHIQ_SERVICE_T *service;
+                               USER_SERVICE_T *user_service;
+                               VCHIQ_HEADER_T *header;
+                               if (instance->completion_remove ==
+                                       instance->completion_insert)
+                                       break;
+                               completion = &instance->completions[
+                                       instance->completion_remove &
+                                       (MAX_COMPLETIONS - 1)];
+
+                               service = completion->service_userdata;
+                               user_service = service->base.userdata;
+                               completion->service_userdata =
+                                       user_service->userdata;
+
+                               header = completion->header;
+                               if (header) {
+                                       void __user *msgbuf;
+                                       int msglen;
+
+                                       msglen = header->size +
+                                               sizeof(VCHIQ_HEADER_T);
+                                       /* This must be a VCHIQ-style service */
+                                       if (args.msgbufsize < msglen) {
+                                               vchiq_log_error(
+                                                       vchiq_arm_log_level,
+                                                       "header %x: msgbufsize"
+                                                       " %x < msglen %x",
+                                                       (unsigned int)header,
+                                                       args.msgbufsize,
+                                                       msglen);
+                                               WARN(1, "invalid message "
+                                                       "size\n");
+                                               if (ret == 0)
+                                                       ret = -EMSGSIZE;
+                                               break;
+                                       }
+                                       if (msgbufcount <= 0)
+                                               /* Stall here for lack of a
+                                               ** buffer for the message. */
+                                               break;
+                                       /* Get the pointer from user space */
+                                       msgbufcount--;
+                                       if (copy_from_user(&msgbuf,
+                                               (const void __user *)
+                                               &args.msgbufs[msgbufcount],
+                                               sizeof(msgbuf)) != 0) {
+                                               if (ret == 0)
+                                                       ret = -EFAULT;
+                                               break;
+                                       }
+
+                                       /* Copy the message to user space */
+                                       if (copy_to_user(msgbuf, header,
+                                               msglen) != 0) {
+                                               if (ret == 0)
+                                                       ret = -EFAULT;
+                                               break;
+                                       }
+
+                                       /* Now it has been copied, the message
+                                       ** can be released. */
+                                       vchiq_release_message(service->handle,
+                                               header);
+
+                                       /* The completion must point to the
+                                       ** msgbuf. */
+                                       completion->header = msgbuf;
+                               }
+
+                               if (completion->reason ==
+                                       VCHIQ_SERVICE_CLOSED)
+                                       unlock_service(service);
+
+                               if (copy_to_user((void __user *)(
+                                       (size_t)args.buf +
+                                       ret * sizeof(VCHIQ_COMPLETION_DATA_T)),
+                                       completion,
+                                       sizeof(VCHIQ_COMPLETION_DATA_T)) != 0) {
+                                               if (ret == 0)
+                                                       ret = -EFAULT;
+                                       break;
+                               }
+
+                               instance->completion_remove++;
+                       }
+
+                       if (msgbufcount != args.msgbufcount) {
+                               if (copy_to_user((void __user *)
+                                       &((VCHIQ_AWAIT_COMPLETION_T *)arg)->
+                                               msgbufcount,
+                                       &msgbufcount,
+                                       sizeof(msgbufcount)) != 0) {
+                                       ret = -EFAULT;
+                               }
+                       }
+               }
+
+               if (ret != 0)
+                       up(&instance->remove_event);
+               mutex_unlock(&instance->completion_mutex);
+               DEBUG_TRACE(AWAIT_COMPLETION_LINE);
+       } break;
+
+       case VCHIQ_IOC_DEQUEUE_MESSAGE: {
+               VCHIQ_DEQUEUE_MESSAGE_T args;
+               USER_SERVICE_T *user_service;
+               VCHIQ_HEADER_T *header;
+
+               DEBUG_TRACE(DEQUEUE_MESSAGE_LINE);
+               if (copy_from_user
+                        (&args, (const void __user *)arg,
+                         sizeof(args)) != 0) {
+                       ret = -EFAULT;
+                       break;
+               }
+               service = find_service_for_instance(instance, args.handle);
+               if (!service) {
+                       ret = -EINVAL;
+                       break;
+               }
+               user_service = (USER_SERVICE_T *)service->base.userdata;
+               if (user_service->is_vchi == 0) {
+                       ret = -EINVAL;
+                       break;
+               }
+
+               spin_lock(&msg_queue_spinlock);
+               if (user_service->msg_remove == user_service->msg_insert) {
+                       if (!args.blocking) {
+                               spin_unlock(&msg_queue_spinlock);
+                               DEBUG_TRACE(DEQUEUE_MESSAGE_LINE);
+                               ret = -EWOULDBLOCK;
+                               break;
+                       }
+                       user_service->dequeue_pending = 1;
+                       do {
+                               spin_unlock(&msg_queue_spinlock);
+                               DEBUG_TRACE(DEQUEUE_MESSAGE_LINE);
+                               if (down_interruptible(
+                                       &user_service->insert_event) != 0) {
+                                       vchiq_log_info(vchiq_arm_log_level,
+                                               "DEQUEUE_MESSAGE interrupted");
+                                       ret = -EINTR;
+                                       break;
+                               }
+                               spin_lock(&msg_queue_spinlock);
+                       } while (user_service->msg_remove ==
+                               user_service->msg_insert);
+
+                       if (ret)
+                               break;
+               }
+
+               BUG_ON((int)(user_service->msg_insert -
+                       user_service->msg_remove) < 0);
+
+               header = user_service->msg_queue[user_service->msg_remove &
+                       (MSG_QUEUE_SIZE - 1)];
+               user_service->msg_remove++;
+               spin_unlock(&msg_queue_spinlock);
+
+               up(&user_service->remove_event);
+               if (header == NULL)
+                       ret = -ENOTCONN;
+               else if (header->size <= args.bufsize) {
+                       /* Copy to user space if msgbuf is not NULL */
+                       if ((args.buf == NULL) ||
+                               (copy_to_user((void __user *)args.buf,
+                               header->data,
+                               header->size) == 0)) {
+                               ret = header->size;
+                               vchiq_release_message(
+                                       service->handle,
+                                       header);
+                       } else
+                               ret = -EFAULT;
+               } else {
+                       vchiq_log_error(vchiq_arm_log_level,
+                               "header %x: bufsize %x < size %x",
+                               (unsigned int)header, args.bufsize,
+                               header->size);
+                       WARN(1, "invalid size\n");
+                       ret = -EMSGSIZE;
+               }
+               DEBUG_TRACE(DEQUEUE_MESSAGE_LINE);
+       } break;
+
+       case VCHIQ_IOC_GET_CLIENT_ID: {
+               VCHIQ_SERVICE_HANDLE_T handle = (VCHIQ_SERVICE_HANDLE_T)arg;
+
+               ret = vchiq_get_client_id(handle);
+       } break;
+
+       case VCHIQ_IOC_GET_CONFIG: {
+               VCHIQ_GET_CONFIG_T args;
+               VCHIQ_CONFIG_T config;
+
+               if (copy_from_user(&args, (const void __user *)arg,
+                       sizeof(args)) != 0) {
+                       ret = -EFAULT;
+                       break;
+               }
+               if (args.config_size > sizeof(config)) {
+                       ret = -EINVAL;
+                       break;
+               }
+               status = vchiq_get_config(instance, args.config_size, &config);
+               if (status == VCHIQ_SUCCESS) {
+                       if (copy_to_user((void __user *)args.pconfig,
+                                   &config, args.config_size) != 0) {
+                               ret = -EFAULT;
+                               break;
+                       }
+               }
+       } break;
+
+       case VCHIQ_IOC_SET_SERVICE_OPTION: {
+               VCHIQ_SET_SERVICE_OPTION_T args;
+
+               if (copy_from_user(
+                       &args, (const void __user *)arg,
+                       sizeof(args)) != 0) {
+                       ret = -EFAULT;
+                       break;
+               }
+
+               service = find_service_for_instance(instance, args.handle);
+               if (!service) {
+                       ret = -EINVAL;
+                       break;
+               }
+
+               status = vchiq_set_service_option(
+                               args.handle, args.option, args.value);
+       } break;
+
+       case VCHIQ_IOC_DUMP_PHYS_MEM: {
+               VCHIQ_DUMP_MEM_T  args;
+
+               if (copy_from_user
+                        (&args, (const void __user *)arg,
+                         sizeof(args)) != 0) {
+                       ret = -EFAULT;
+                       break;
+               }
+               dump_phys_mem(args.virt_addr, args.num_bytes);
+       } break;
+
+       default:
+               ret = -ENOTTY;
+               break;
+       }
+
+       if (service)
+               unlock_service(service);
+
+       if (ret == 0) {
+               if (status == VCHIQ_ERROR)
+                       ret = -EIO;
+               else if (status == VCHIQ_RETRY)
+                       ret = -EINTR;
+       }
+
+       if ((status == VCHIQ_SUCCESS) && (ret < 0) && (ret != -EINTR) &&
+               (ret != -EWOULDBLOCK))
+               vchiq_log_info(vchiq_arm_log_level,
+                       "  ioctl instance %lx, cmd %s -> status %d, %ld",
+                       (unsigned long)instance,
+                       (_IOC_NR(cmd) <= VCHIQ_IOC_MAX) ?
+                               ioctl_names[_IOC_NR(cmd)] :
+                               "<invalid>",
+                       status, ret);
+       else
+               vchiq_log_trace(vchiq_arm_log_level,
+                       "  ioctl instance %lx, cmd %s -> status %d, %ld",
+                       (unsigned long)instance,
+                       (_IOC_NR(cmd) <= VCHIQ_IOC_MAX) ?
+                               ioctl_names[_IOC_NR(cmd)] :
+                               "<invalid>",
+                       status, ret);
+
+       return ret;
+}
+
+/****************************************************************************
+*
+*   vchiq_open
+*
+***************************************************************************/
+
+static int
+vchiq_open(struct inode *inode, struct file *file)
+{
+       int dev = iminor(inode) & 0x0f;
+       vchiq_log_info(vchiq_arm_log_level, "vchiq_open");
+       switch (dev) {
+       case VCHIQ_MINOR: {
+               int ret;
+               VCHIQ_STATE_T *state = vchiq_get_state();
+               VCHIQ_INSTANCE_T instance;
+
+               if (!state) {
+                       vchiq_log_error(vchiq_arm_log_level,
+                               "vchiq has no connection to VideoCore");
+                       return -ENOTCONN;
+               }
+
+               instance = kzalloc(sizeof(*instance), GFP_KERNEL);
+               if (!instance)
+                       return -ENOMEM;
+
+               instance->state = state;
+               instance->pid = current->tgid;
+
+               ret = vchiq_proc_add_instance(instance);
+               if (ret != 0) {
+                       kfree(instance);
+                       return ret;
+               }
+
+               sema_init(&instance->insert_event, 0);
+               sema_init(&instance->remove_event, 0);
+               mutex_init(&instance->completion_mutex);
+               mutex_init(&instance->bulk_waiter_list_mutex);
+               INIT_LIST_HEAD(&instance->bulk_waiter_list);
+
+               file->private_data = instance;
+       } break;
+
+       default:
+               vchiq_log_error(vchiq_arm_log_level,
+                       "Unknown minor device: %d", dev);
+               return -ENXIO;
+       }
+
+       return 0;
+}
+
+/****************************************************************************
+*
+*   vchiq_release
+*
+***************************************************************************/
+
+static int
+vchiq_release(struct inode *inode, struct file *file)
+{
+       int dev = iminor(inode) & 0x0f;
+       int ret = 0;
+       switch (dev) {
+       case VCHIQ_MINOR: {
+               VCHIQ_INSTANCE_T instance = file->private_data;
+               VCHIQ_STATE_T *state = vchiq_get_state();
+               VCHIQ_SERVICE_T *service;
+               int i;
+
+               vchiq_log_info(vchiq_arm_log_level,
+                       "vchiq_release: instance=%lx",
+                       (unsigned long)instance);
+
+               if (!state) {
+                       ret = -EPERM;
+                       goto out;
+               }
+
+               /* Ensure videocore is awake to allow termination. */
+               vchiq_use_internal(instance->state, NULL,
+                               USE_TYPE_VCHIQ);
+
+               mutex_lock(&instance->completion_mutex);
+
+               /* Wake the completion thread and ask it to exit */
+               instance->closing = 1;
+               up(&instance->insert_event);
+
+               mutex_unlock(&instance->completion_mutex);
+
+               /* Wake the slot handler if the completion queue is full. */
+               up(&instance->remove_event);
+
+               /* Mark all services for termination... */
+               i = 0;
+               while ((service = next_service_by_instance(state, instance,
+                       &i)) != NULL) {
+                       USER_SERVICE_T *user_service = service->base.userdata;
+
+                       /* Wake the slot handler if the msg queue is full. */
+                       up(&user_service->remove_event);
+
+                       vchiq_terminate_service_internal(service);
+                       unlock_service(service);
+               }
+
+               /* ...and wait for them to die */
+               i = 0;
+               while ((service = next_service_by_instance(state, instance, &i))
+                       != NULL) {
+                       USER_SERVICE_T *user_service = service->base.userdata;
+
+                       down(&service->remove_event);
+
+                       BUG_ON(service->srvstate != VCHIQ_SRVSTATE_FREE);
+
+                       spin_lock(&msg_queue_spinlock);
+
+                       while (user_service->msg_remove !=
+                               user_service->msg_insert) {
+                               VCHIQ_HEADER_T *header = user_service->
+                                       msg_queue[user_service->msg_remove &
+                                               (MSG_QUEUE_SIZE - 1)];
+                               user_service->msg_remove++;
+                               spin_unlock(&msg_queue_spinlock);
+
+                               if (header)
+                                       vchiq_release_message(
+                                               service->handle,
+                                               header);
+                               spin_lock(&msg_queue_spinlock);
+                       }
+
+                       spin_unlock(&msg_queue_spinlock);
+
+                       unlock_service(service);
+               }
+
+               /* Release any closed services */
+               while (instance->completion_remove !=
+                       instance->completion_insert) {
+                       VCHIQ_COMPLETION_DATA_T *completion;
+                       VCHIQ_SERVICE_T *service;
+                       completion = &instance->completions[
+                               instance->completion_remove &
+                               (MAX_COMPLETIONS - 1)];
+                       service = completion->service_userdata;
+                       if (completion->reason == VCHIQ_SERVICE_CLOSED)
+                               unlock_service(service);
+                       instance->completion_remove++;
+               }
+
+               /* Release the PEER service count. */
+               vchiq_release_internal(instance->state, NULL);
+
+               {
+                       struct list_head *pos, *next;
+                       list_for_each_safe(pos, next,
+                               &instance->bulk_waiter_list) {
+                               struct bulk_waiter_node *waiter;
+                               waiter = list_entry(pos,
+                                       struct bulk_waiter_node,
+                                       list);
+                               list_del(pos);
+                               vchiq_log_info(vchiq_arm_log_level,
+                                       "bulk_waiter - cleaned up %x "
+                                       "for pid %d",
+                                       (unsigned int)waiter, waiter->pid);
+                               kfree(waiter);
+                       }
+               }
+
+               vchiq_proc_remove_instance(instance);
+
+               kfree(instance);
+               file->private_data = NULL;
+       } break;
+
+       default:
+               vchiq_log_error(vchiq_arm_log_level,
+                       "Unknown minor device: %d", dev);
+               ret = -ENXIO;
+       }
+
+out:
+       return ret;
+}
+
+/****************************************************************************
+*
+*   vchiq_dump
+*
+***************************************************************************/
+
+void
+vchiq_dump(void *dump_context, const char *str, int len)
+{
+       DUMP_CONTEXT_T *context = (DUMP_CONTEXT_T *)dump_context;
+
+       if (context->actual < context->space) {
+               int copy_bytes;
+               if (context->offset > 0) {
+                       int skip_bytes = min(len, (int)context->offset);
+                       str += skip_bytes;
+                       len -= skip_bytes;
+                       context->offset -= skip_bytes;
+                       if (context->offset > 0)
+                               return;
+               }
+               copy_bytes = min(len, (int)(context->space - context->actual));
+               if (copy_bytes == 0)
+                       return;
+               if (copy_to_user(context->buf + context->actual, str,
+                       copy_bytes))
+                       context->actual = -EFAULT;
+               context->actual += copy_bytes;
+               len -= copy_bytes;
+
+               /* If tne terminating NUL is included in the length, then it
+               ** marks the end of a line and should be replaced with a
+               ** carriage return. */
+               if ((len == 0) && (str[copy_bytes - 1] == '\0')) {
+                       char cr = '\n';
+                       if (copy_to_user(context->buf + context->actual - 1,
+                               &cr, 1))
+                               context->actual = -EFAULT;
+               }
+       }
+}
+
+/****************************************************************************
+*
+*   vchiq_dump_platform_instance_state
+*
+***************************************************************************/
+
+void
+vchiq_dump_platform_instances(void *dump_context)
+{
+       VCHIQ_STATE_T *state = vchiq_get_state();
+       char buf[80];
+       int len;
+       int i;
+
+       /* There is no list of instances, so instead scan all services,
+               marking those that have been dumped. */
+
+       for (i = 0; i < state->unused_service; i++) {
+               VCHIQ_SERVICE_T *service = state->services[i];
+               VCHIQ_INSTANCE_T instance;
+
+               if (service && (service->base.callback == service_callback)) {
+                       instance = service->instance;
+                       if (instance)
+                               instance->mark = 0;
+               }
+       }
+
+       for (i = 0; i < state->unused_service; i++) {
+               VCHIQ_SERVICE_T *service = state->services[i];
+               VCHIQ_INSTANCE_T instance;
+
+               if (service && (service->base.callback == service_callback)) {
+                       instance = service->instance;
+                       if (instance && !instance->mark) {
+                               len = snprintf(buf, sizeof(buf),
+                                       "Instance %x: pid %d,%s completions "
+                                               "%d/%d",
+                                       (unsigned int)instance, instance->pid,
+                                       instance->connected ? " connected, " :
+                                               "",
+                                       instance->completion_insert -
+                                               instance->completion_remove,
+                                       MAX_COMPLETIONS);
+
+                               vchiq_dump(dump_context, buf, len + 1);
+
+                               instance->mark = 1;
+                       }
+               }
+       }
+}
+
+/****************************************************************************
+*
+*   vchiq_dump_platform_service_state
+*
+***************************************************************************/
+
+void
+vchiq_dump_platform_service_state(void *dump_context, VCHIQ_SERVICE_T *service)
+{
+       USER_SERVICE_T *user_service = (USER_SERVICE_T *)service->base.userdata;
+       char buf[80];
+       int len;
+
+       len = snprintf(buf, sizeof(buf), "  instance %x",
+               (unsigned int)service->instance);
+
+       if ((service->base.callback == service_callback) &&
+               user_service->is_vchi) {
+               len += snprintf(buf + len, sizeof(buf) - len,
+                       ", %d/%d messages",
+                       user_service->msg_insert - user_service->msg_remove,
+                       MSG_QUEUE_SIZE);
+
+               if (user_service->dequeue_pending)
+                       len += snprintf(buf + len, sizeof(buf) - len,
+                               " (dequeue pending)");
+       }
+
+       vchiq_dump(dump_context, buf, len + 1);
+}
+
+/****************************************************************************
+*
+*   dump_user_mem
+*
+***************************************************************************/
+
+static void
+dump_phys_mem(void *virt_addr, uint32_t num_bytes)
+{
+       int            rc;
+       uint8_t       *end_virt_addr = virt_addr + num_bytes;
+       int            num_pages;
+       int            offset;
+       int            end_offset;
+       int            page_idx;
+       int            prev_idx;
+       struct page   *page;
+       struct page  **pages;
+       uint8_t       *kmapped_virt_ptr;
+
+       /* Align virtAddr and endVirtAddr to 16 byte boundaries. */
+
+       virt_addr = (void *)((unsigned long)virt_addr & ~0x0fuL);
+       end_virt_addr = (void *)(((unsigned long)end_virt_addr + 15uL) &
+               ~0x0fuL);
+
+       offset = (int)(long)virt_addr & (PAGE_SIZE - 1);
+       end_offset = (int)(long)end_virt_addr & (PAGE_SIZE - 1);
+
+       num_pages = (offset + num_bytes + PAGE_SIZE - 1) / PAGE_SIZE;
+
+       pages = kmalloc(sizeof(struct page *) * num_pages, GFP_KERNEL);
+       if (pages == NULL) {
+               vchiq_log_error(vchiq_arm_log_level,
+                       "Unable to allocation memory for %d pages\n",
+                       num_pages);
+               return;
+       }
+
+       down_read(&current->mm->mmap_sem);
+       rc = get_user_pages(current,      /* task */
+               current->mm,              /* mm */
+               (unsigned long)virt_addr, /* start */
+               num_pages,                /* len */
+               0,                        /* write */
+               0,                        /* force */
+               pages,                    /* pages (array of page pointers) */
+               NULL);                    /* vmas */
+       up_read(&current->mm->mmap_sem);
+
+       prev_idx = -1;
+       page = NULL;
+
+       while (offset < end_offset) {
+
+               int page_offset = offset % PAGE_SIZE;
+               page_idx = offset / PAGE_SIZE;
+
+               if (page_idx != prev_idx) {
+
+                       if (page != NULL)
+                               kunmap(page);
+                       page = pages[page_idx];
+                       kmapped_virt_ptr = kmap(page);
+
+                       prev_idx = page_idx;
+               }
+
+               if (vchiq_arm_log_level >= VCHIQ_LOG_TRACE)
+                       vchiq_log_dump_mem("ph",
+                               (uint32_t)(unsigned long)&kmapped_virt_ptr[
+                                       page_offset],
+                               &kmapped_virt_ptr[page_offset], 16);
+
+               offset += 16;
+       }
+       if (page != NULL)
+               kunmap(page);
+
+       for (page_idx = 0; page_idx < num_pages; page_idx++)
+               page_cache_release(pages[page_idx]);
+
+       kfree(pages);
+}
+
+/****************************************************************************
+*
+*   vchiq_read
+*
+***************************************************************************/
+
+static ssize_t
+vchiq_read(struct file *file, char __user *buf,
+       size_t count, loff_t *ppos)
+{
+       DUMP_CONTEXT_T context;
+       context.buf = buf;
+       context.actual = 0;
+       context.space = count;
+       context.offset = *ppos;
+
+       vchiq_dump_state(&context, &g_state);
+
+       *ppos += context.actual;
+
+       return context.actual;
+}
+
+VCHIQ_STATE_T *
+vchiq_get_state(void)
+{
+
+       if (g_state.remote == NULL)
+               printk(KERN_ERR "%s: g_state.remote == NULL\n", __func__);
+       else if (g_state.remote->initialised != 1)
+               printk(KERN_NOTICE "%s: g_state.remote->initialised != 1 (%d)\n",
+                       __func__, g_state.remote->initialised);
+
+       return ((g_state.remote != NULL) &&
+               (g_state.remote->initialised == 1)) ? &g_state : NULL;
+}
+
+static const struct file_operations
+vchiq_fops = {
+       .owner = THIS_MODULE,
+       .unlocked_ioctl = vchiq_ioctl,
+       .open = vchiq_open,
+       .release = vchiq_release,
+       .read = vchiq_read
+};
+
+/*
+ * Autosuspend related functionality
+ */
+
+int
+vchiq_videocore_wanted(VCHIQ_STATE_T *state)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       if (!arm_state)
+               /* autosuspend not supported - always return wanted */
+               return 1;
+       else if (arm_state->blocked_count)
+               return 1;
+       else if (!arm_state->videocore_use_count)
+               /* usage count zero - check for override unless we're forcing */
+               if (arm_state->resume_blocked)
+                       return 0;
+               else
+                       return vchiq_platform_videocore_wanted(state);
+       else
+               /* non-zero usage count - videocore still required */
+               return 1;
+}
+
+static VCHIQ_STATUS_T
+vchiq_keepalive_vchiq_callback(VCHIQ_REASON_T reason,
+       VCHIQ_HEADER_T *header,
+       VCHIQ_SERVICE_HANDLE_T service_user,
+       void *bulk_user)
+{
+       vchiq_log_error(vchiq_susp_log_level,
+               "%s callback reason %d", __func__, reason);
+       return 0;
+}
+
+static int
+vchiq_keepalive_thread_func(void *v)
+{
+       VCHIQ_STATE_T *state = (VCHIQ_STATE_T *) v;
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+
+       VCHIQ_STATUS_T status;
+       VCHIQ_INSTANCE_T instance;
+       VCHIQ_SERVICE_HANDLE_T ka_handle;
+
+       VCHIQ_SERVICE_PARAMS_T params = {
+               .fourcc      = VCHIQ_MAKE_FOURCC('K', 'E', 'E', 'P'),
+               .callback    = vchiq_keepalive_vchiq_callback,
+               .version     = KEEPALIVE_VER,
+               .version_min = KEEPALIVE_VER_MIN
+       };
+
+       status = vchiq_initialise(&instance);
+       if (status != VCHIQ_SUCCESS) {
+               vchiq_log_error(vchiq_susp_log_level,
+                       "%s vchiq_initialise failed %d", __func__, status);
+               goto exit;
+       }
+
+       status = vchiq_connect(instance);
+       if (status != VCHIQ_SUCCESS) {
+               vchiq_log_error(vchiq_susp_log_level,
+                       "%s vchiq_connect failed %d", __func__, status);
+               goto shutdown;
+       }
+
+       status = vchiq_add_service(instance, &params, &ka_handle);
+       if (status != VCHIQ_SUCCESS) {
+               vchiq_log_error(vchiq_susp_log_level,
+                       "%s vchiq_open_service failed %d", __func__, status);
+               goto shutdown;
+       }
+
+       while (1) {
+               long rc = 0, uc = 0;
+               if (wait_for_completion_interruptible(&arm_state->ka_evt)
+                               != 0) {
+                       vchiq_log_error(vchiq_susp_log_level,
+                               "%s interrupted", __func__);
+                       flush_signals(current);
+                       continue;
+               }
+
+               /* read and clear counters.  Do release_count then use_count to
+                * prevent getting more releases than uses */
+               rc = atomic_xchg(&arm_state->ka_release_count, 0);
+               uc = atomic_xchg(&arm_state->ka_use_count, 0);
+
+               /* Call use/release service the requisite number of times.
+                * Process use before release so use counts don't go negative */
+               while (uc--) {
+                       atomic_inc(&arm_state->ka_use_ack_count);
+                       status = vchiq_use_service(ka_handle);
+                       if (status != VCHIQ_SUCCESS) {
+                               vchiq_log_error(vchiq_susp_log_level,
+                                       "%s vchiq_use_service error %d",
+                                       __func__, status);
+                       }
+               }
+               while (rc--) {
+                       status = vchiq_release_service(ka_handle);
+                       if (status != VCHIQ_SUCCESS) {
+                               vchiq_log_error(vchiq_susp_log_level,
+                                       "%s vchiq_release_service error %d",
+                                       __func__, status);
+                       }
+               }
+       }
+
+shutdown:
+       vchiq_shutdown(instance);
+exit:
+       return 0;
+}
+
+
+
+VCHIQ_STATUS_T
+vchiq_arm_init_state(VCHIQ_STATE_T *state, VCHIQ_ARM_STATE_T *arm_state)
+{
+       VCHIQ_STATUS_T status = VCHIQ_SUCCESS;
+
+       if (arm_state) {
+               rwlock_init(&arm_state->susp_res_lock);
+
+               init_completion(&arm_state->ka_evt);
+               atomic_set(&arm_state->ka_use_count, 0);
+               atomic_set(&arm_state->ka_use_ack_count, 0);
+               atomic_set(&arm_state->ka_release_count, 0);
+
+               init_completion(&arm_state->vc_suspend_complete);
+
+               init_completion(&arm_state->vc_resume_complete);
+               /* Initialise to 'done' state.  We only want to block on resume
+                * completion while videocore is suspended. */
+               set_resume_state(arm_state, VC_RESUME_RESUMED);
+
+               init_completion(&arm_state->resume_blocker);
+               /* Initialise to 'done' state.  We only want to block on this
+                * completion while resume is blocked */
+               complete_all(&arm_state->resume_blocker);
+
+               init_completion(&arm_state->blocked_blocker);
+               /* Initialise to 'done' state.  We only want to block on this
+                * completion while things are waiting on the resume blocker */
+               complete_all(&arm_state->blocked_blocker);
+
+               arm_state->suspend_timer_timeout = SUSPEND_TIMER_TIMEOUT_MS;
+               arm_state->suspend_timer_running = 0;
+               init_timer(&arm_state->suspend_timer);
+               arm_state->suspend_timer.data = (unsigned long)(state);
+               arm_state->suspend_timer.function = suspend_timer_callback;
+
+               arm_state->first_connect = 0;
+
+       }
+       return status;
+}
+
+/*
+** Functions to modify the state variables;
+**     set_suspend_state
+**     set_resume_state
+**
+** There are more state variables than we might like, so ensure they remain in
+** step.  Suspend and resume state are maintained separately, since most of
+** these state machines can operate independently.  However, there are a few
+** states where state transitions in one state machine cause a reset to the
+** other state machine.  In addition, there are some completion events which
+** need to occur on state machine reset and end-state(s), so these are also
+** dealt with in these functions.
+**
+** In all states we set the state variable according to the input, but in some
+** cases we perform additional steps outlined below;
+**
+** VC_SUSPEND_IDLE - Initialise the suspend completion at the same time.
+**                     The suspend completion is completed after any suspend
+**                     attempt.  When we reset the state machine we also reset
+**                     the completion.  This reset occurs when videocore is
+**                     resumed, and also if we initiate suspend after a suspend
+**                     failure.
+**
+** VC_SUSPEND_IN_PROGRESS - This state is considered the point of no return for
+**                     suspend - ie from this point on we must try to suspend
+**                     before resuming can occur.  We therefore also reset the
+**                     resume state machine to VC_RESUME_IDLE in this state.
+**
+** VC_SUSPEND_SUSPENDED - Suspend has completed successfully. Also call
+**                     complete_all on the suspend completion to notify
+**                     anything waiting for suspend to happen.
+**
+** VC_SUSPEND_REJECTED - Videocore rejected suspend. Videocore will also
+**                     initiate resume, so no need to alter resume state.
+**                     We call complete_all on the suspend completion to notify
+**                     of suspend rejection.
+**
+** VC_SUSPEND_FAILED - We failed to initiate videocore suspend.  We notify the
+**                     suspend completion and reset the resume state machine.
+**
+** VC_RESUME_IDLE - Initialise the resume completion at the same time.  The
+**                     resume completion is in it's 'done' state whenever
+**                     videcore is running.  Therfore, the VC_RESUME_IDLE state
+**                     implies that videocore is suspended.
+**                     Hence, any thread which needs to wait until videocore is
+**                     running can wait on this completion - it will only block
+**                     if videocore is suspended.
+**
+** VC_RESUME_RESUMED - Resume has completed successfully.  Videocore is running.
+**                     Call complete_all on the resume completion to unblock
+**                     any threads waiting for resume.  Also reset the suspend
+**                     state machine to it's idle state.
+**
+** VC_RESUME_FAILED - Currently unused - no mechanism to fail resume exists.
+*/
+
+inline void
+set_suspend_state(VCHIQ_ARM_STATE_T *arm_state,
+       enum vc_suspend_status new_state)
+{
+       /* set the state in all cases */
+       arm_state->vc_suspend_state = new_state;
+
+       /* state specific additional actions */
+       switch (new_state) {
+       case VC_SUSPEND_FORCE_CANCELED:
+               complete_all(&arm_state->vc_suspend_complete);
+               break;
+       case VC_SUSPEND_REJECTED:
+               complete_all(&arm_state->vc_suspend_complete);
+               break;
+       case VC_SUSPEND_FAILED:
+               complete_all(&arm_state->vc_suspend_complete);
+               arm_state->vc_resume_state = VC_RESUME_RESUMED;
+               complete_all(&arm_state->vc_resume_complete);
+               break;
+       case VC_SUSPEND_IDLE:
+               reinit_completion(&arm_state->vc_suspend_complete);
+               break;
+       case VC_SUSPEND_REQUESTED:
+               break;
+       case VC_SUSPEND_IN_PROGRESS:
+               set_resume_state(arm_state, VC_RESUME_IDLE);
+               break;
+       case VC_SUSPEND_SUSPENDED:
+               complete_all(&arm_state->vc_suspend_complete);
+               break;
+       default:
+               BUG();
+               break;
+       }
+}
+
+inline void
+set_resume_state(VCHIQ_ARM_STATE_T *arm_state,
+       enum vc_resume_status new_state)
+{
+       /* set the state in all cases */
+       arm_state->vc_resume_state = new_state;
+
+       /* state specific additional actions */
+       switch (new_state) {
+       case VC_RESUME_FAILED:
+               break;
+       case VC_RESUME_IDLE:
+               reinit_completion(&arm_state->vc_resume_complete);
+               break;
+       case VC_RESUME_REQUESTED:
+               break;
+       case VC_RESUME_IN_PROGRESS:
+               break;
+       case VC_RESUME_RESUMED:
+               complete_all(&arm_state->vc_resume_complete);
+               set_suspend_state(arm_state, VC_SUSPEND_IDLE);
+               break;
+       default:
+               BUG();
+               break;
+       }
+}
+
+
+/* should be called with the write lock held */
+inline void
+start_suspend_timer(VCHIQ_ARM_STATE_T *arm_state)
+{
+       del_timer(&arm_state->suspend_timer);
+       arm_state->suspend_timer.expires = jiffies +
+               msecs_to_jiffies(arm_state->
+                       suspend_timer_timeout);
+       add_timer(&arm_state->suspend_timer);
+       arm_state->suspend_timer_running = 1;
+}
+
+/* should be called with the write lock held */
+static inline void
+stop_suspend_timer(VCHIQ_ARM_STATE_T *arm_state)
+{
+       if (arm_state->suspend_timer_running) {
+               del_timer(&arm_state->suspend_timer);
+               arm_state->suspend_timer_running = 0;
+       }
+}
+
+static inline int
+need_resume(VCHIQ_STATE_T *state)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       return (arm_state->vc_suspend_state > VC_SUSPEND_IDLE) &&
+                       (arm_state->vc_resume_state < VC_RESUME_REQUESTED) &&
+                       vchiq_videocore_wanted(state);
+}
+
+static int
+block_resume(VCHIQ_ARM_STATE_T *arm_state)
+{
+       int status = VCHIQ_SUCCESS;
+       const unsigned long timeout_val =
+                               msecs_to_jiffies(FORCE_SUSPEND_TIMEOUT_MS);
+       int resume_count = 0;
+
+       /* Allow any threads which were blocked by the last force suspend to
+        * complete if they haven't already.  Only give this one shot; if
+        * blocked_count is incremented after blocked_blocker is completed
+        * (which only happens when blocked_count hits 0) then those threads
+        * will have to wait until next time around */
+       if (arm_state->blocked_count) {
+               reinit_completion(&arm_state->blocked_blocker);
+               write_unlock_bh(&arm_state->susp_res_lock);
+               vchiq_log_info(vchiq_susp_log_level, "%s wait for previously "
+                       "blocked clients", __func__);
+               if (wait_for_completion_interruptible_timeout(
+                               &arm_state->blocked_blocker, timeout_val)
+                                       <= 0) {
+                       vchiq_log_error(vchiq_susp_log_level, "%s wait for "
+                               "previously blocked clients failed" , __func__);
+                       status = VCHIQ_ERROR;
+                       write_lock_bh(&arm_state->susp_res_lock);
+                       goto out;
+               }
+               vchiq_log_info(vchiq_susp_log_level, "%s previously blocked "
+                       "clients resumed", __func__);
+               write_lock_bh(&arm_state->susp_res_lock);
+       }
+
+       /* We need to wait for resume to complete if it's in process */
+       while (arm_state->vc_resume_state != VC_RESUME_RESUMED &&
+                       arm_state->vc_resume_state > VC_RESUME_IDLE) {
+               if (resume_count > 1) {
+                       status = VCHIQ_ERROR;
+                       vchiq_log_error(vchiq_susp_log_level, "%s waited too "
+                               "many times for resume" , __func__);
+                       goto out;
+               }
+               write_unlock_bh(&arm_state->susp_res_lock);
+               vchiq_log_info(vchiq_susp_log_level, "%s wait for resume",
+                       __func__);
+               if (wait_for_completion_interruptible_timeout(
+                               &arm_state->vc_resume_complete, timeout_val)
+                                       <= 0) {
+                       vchiq_log_error(vchiq_susp_log_level, "%s wait for "
+                               "resume failed (%s)", __func__,
+                               resume_state_names[arm_state->vc_resume_state +
+                                                       VC_RESUME_NUM_OFFSET]);
+                       status = VCHIQ_ERROR;
+                       write_lock_bh(&arm_state->susp_res_lock);
+                       goto out;
+               }
+               vchiq_log_info(vchiq_susp_log_level, "%s resumed", __func__);
+               write_lock_bh(&arm_state->susp_res_lock);
+               resume_count++;
+       }
+       reinit_completion(&arm_state->resume_blocker);
+       arm_state->resume_blocked = 1;
+
+out:
+       return status;
+}
+
+static inline void
+unblock_resume(VCHIQ_ARM_STATE_T *arm_state)
+{
+       complete_all(&arm_state->resume_blocker);
+       arm_state->resume_blocked = 0;
+}
+
+/* Initiate suspend via slot handler. Should be called with the write lock
+ * held */
+VCHIQ_STATUS_T
+vchiq_arm_vcsuspend(VCHIQ_STATE_T *state)
+{
+       VCHIQ_STATUS_T status = VCHIQ_ERROR;
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+
+       if (!arm_state)
+               goto out;
+
+       vchiq_log_trace(vchiq_susp_log_level, "%s", __func__);
+       status = VCHIQ_SUCCESS;
+
+
+       switch (arm_state->vc_suspend_state) {
+       case VC_SUSPEND_REQUESTED:
+               vchiq_log_info(vchiq_susp_log_level, "%s: suspend already "
+                       "requested", __func__);
+               break;
+       case VC_SUSPEND_IN_PROGRESS:
+               vchiq_log_info(vchiq_susp_log_level, "%s: suspend already in "
+                       "progress", __func__);
+               break;
+
+       default:
+               /* We don't expect to be in other states, so log but continue
+                * anyway */
+               vchiq_log_error(vchiq_susp_log_level,
+                       "%s unexpected suspend state %s", __func__,
+                       suspend_state_names[arm_state->vc_suspend_state +
+                                               VC_SUSPEND_NUM_OFFSET]);
+               /* fall through */
+       case VC_SUSPEND_REJECTED:
+       case VC_SUSPEND_FAILED:
+               /* Ensure any idle state actions have been run */
+               set_suspend_state(arm_state, VC_SUSPEND_IDLE);
+               /* fall through */
+       case VC_SUSPEND_IDLE:
+               vchiq_log_info(vchiq_susp_log_level,
+                       "%s: suspending", __func__);
+               set_suspend_state(arm_state, VC_SUSPEND_REQUESTED);
+               /* kick the slot handler thread to initiate suspend */
+               request_poll(state, NULL, 0);
+               break;
+       }
+
+out:
+       vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, status);
+       return status;
+}
+
+void
+vchiq_platform_check_suspend(VCHIQ_STATE_T *state)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       int susp = 0;
+
+       if (!arm_state)
+               goto out;
+
+       vchiq_log_trace(vchiq_susp_log_level, "%s", __func__);
+
+       write_lock_bh(&arm_state->susp_res_lock);
+       if (arm_state->vc_suspend_state == VC_SUSPEND_REQUESTED &&
+                       arm_state->vc_resume_state == VC_RESUME_RESUMED) {
+               set_suspend_state(arm_state, VC_SUSPEND_IN_PROGRESS);
+               susp = 1;
+       }
+       write_unlock_bh(&arm_state->susp_res_lock);
+
+       if (susp)
+               vchiq_platform_suspend(state);
+
+out:
+       vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__);
+       return;
+}
+
+
+static void
+output_timeout_error(VCHIQ_STATE_T *state)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       char service_err[50] = "";
+       int vc_use_count = arm_state->videocore_use_count;
+       int active_services = state->unused_service;
+       int i;
+
+       if (!arm_state->videocore_use_count) {
+               snprintf(service_err, 50, " Videocore usecount is 0");
+               goto output_msg;
+       }
+       for (i = 0; i < active_services; i++) {
+               VCHIQ_SERVICE_T *service_ptr = state->services[i];
+               if (service_ptr && service_ptr->service_use_count &&
+                       (service_ptr->srvstate != VCHIQ_SRVSTATE_FREE)) {
+                       snprintf(service_err, 50, " %c%c%c%c(%d) service has "
+                               "use count %d%s", VCHIQ_FOURCC_AS_4CHARS(
+                                       service_ptr->base.fourcc),
+                                service_ptr->client_id,
+                                service_ptr->service_use_count,
+                                service_ptr->service_use_count ==
+                                        vc_use_count ? "" : " (+ more)");
+                       break;
+               }
+       }
+
+output_msg:
+       vchiq_log_error(vchiq_susp_log_level,
+               "timed out waiting for vc suspend (%d).%s",
+                arm_state->autosuspend_override, service_err);
+
+}
+
+/* Try to get videocore into suspended state, regardless of autosuspend state.
+** We don't actually force suspend, since videocore may get into a bad state
+** if we force suspend at a bad time.  Instead, we wait for autosuspend to
+** determine a good point to suspend.  If this doesn't happen within 100ms we
+** report failure.
+**
+** Returns VCHIQ_SUCCESS if videocore suspended successfully, VCHIQ_RETRY if
+** videocore failed to suspend in time or VCHIQ_ERROR if interrupted.
+*/
+VCHIQ_STATUS_T
+vchiq_arm_force_suspend(VCHIQ_STATE_T *state)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       VCHIQ_STATUS_T status = VCHIQ_ERROR;
+       long rc = 0;
+       int repeat = -1;
+
+       if (!arm_state)
+               goto out;
+
+       vchiq_log_trace(vchiq_susp_log_level, "%s", __func__);
+
+       write_lock_bh(&arm_state->susp_res_lock);
+
+       status = block_resume(arm_state);
+       if (status != VCHIQ_SUCCESS)
+               goto unlock;
+       if (arm_state->vc_suspend_state == VC_SUSPEND_SUSPENDED) {
+               /* Already suspended - just block resume and exit */
+               vchiq_log_info(vchiq_susp_log_level, "%s already suspended",
+                       __func__);
+               status = VCHIQ_SUCCESS;
+               goto unlock;
+       } else if (arm_state->vc_suspend_state <= VC_SUSPEND_IDLE) {
+               /* initiate suspend immediately in the case that we're waiting
+                * for the timeout */
+               stop_suspend_timer(arm_state);
+               if (!vchiq_videocore_wanted(state)) {
+                       vchiq_log_info(vchiq_susp_log_level, "%s videocore "
+                               "idle, initiating suspend", __func__);
+                       status = vchiq_arm_vcsuspend(state);
+               } else if (arm_state->autosuspend_override <
+                                               FORCE_SUSPEND_FAIL_MAX) {
+                       vchiq_log_info(vchiq_susp_log_level, "%s letting "
+                               "videocore go idle", __func__);
+                       status = VCHIQ_SUCCESS;
+               } else {
+                       vchiq_log_warning(vchiq_susp_log_level, "%s failed too "
+                               "many times - attempting suspend", __func__);
+                       status = vchiq_arm_vcsuspend(state);
+               }
+       } else {
+               vchiq_log_info(vchiq_susp_log_level, "%s videocore suspend "
+                       "in progress - wait for completion", __func__);
+               status = VCHIQ_SUCCESS;
+       }
+
+       /* Wait for suspend to happen due to system idle (not forced..) */
+       if (status != VCHIQ_SUCCESS)
+               goto unblock_resume;
+
+       do {
+               write_unlock_bh(&arm_state->susp_res_lock);
+
+               rc = wait_for_completion_interruptible_timeout(
+                               &arm_state->vc_suspend_complete,
+                               msecs_to_jiffies(FORCE_SUSPEND_TIMEOUT_MS));
+
+               write_lock_bh(&arm_state->susp_res_lock);
+               if (rc < 0) {
+                       vchiq_log_warning(vchiq_susp_log_level, "%s "
+                               "interrupted waiting for suspend", __func__);
+                       status = VCHIQ_ERROR;
+                       goto unblock_resume;
+               } else if (rc == 0) {
+                       if (arm_state->vc_suspend_state > VC_SUSPEND_IDLE) {
+                               /* Repeat timeout once if in progress */
+                               if (repeat < 0) {
+                                       repeat = 1;
+                                       continue;
+                               }
+                       }
+                       arm_state->autosuspend_override++;
+                       output_timeout_error(state);
+
+                       status = VCHIQ_RETRY;
+                       goto unblock_resume;
+               }
+       } while (0 < (repeat--));
+
+       /* Check and report state in case we need to abort ARM suspend */
+       if (arm_state->vc_suspend_state != VC_SUSPEND_SUSPENDED) {
+               status = VCHIQ_RETRY;
+               vchiq_log_error(vchiq_susp_log_level,
+                       "%s videocore suspend failed (state %s)", __func__,
+                       suspend_state_names[arm_state->vc_suspend_state +
+                                               VC_SUSPEND_NUM_OFFSET]);
+               /* Reset the state only if it's still in an error state.
+                * Something could have already initiated another suspend. */
+               if (arm_state->vc_suspend_state < VC_SUSPEND_IDLE)
+                       set_suspend_state(arm_state, VC_SUSPEND_IDLE);
+
+               goto unblock_resume;
+       }
+
+       /* successfully suspended - unlock and exit */
+       goto unlock;
+
+unblock_resume:
+       /* all error states need to unblock resume before exit */
+       unblock_resume(arm_state);
+
+unlock:
+       write_unlock_bh(&arm_state->susp_res_lock);
+
+out:
+       vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, status);
+       return status;
+}
+
+void
+vchiq_check_suspend(VCHIQ_STATE_T *state)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+
+       if (!arm_state)
+               goto out;
+
+       vchiq_log_trace(vchiq_susp_log_level, "%s", __func__);
+
+       write_lock_bh(&arm_state->susp_res_lock);
+       if (arm_state->vc_suspend_state != VC_SUSPEND_SUSPENDED &&
+                       arm_state->first_connect &&
+                       !vchiq_videocore_wanted(state)) {
+               vchiq_arm_vcsuspend(state);
+       }
+       write_unlock_bh(&arm_state->susp_res_lock);
+
+out:
+       vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__);
+       return;
+}
+
+
+int
+vchiq_arm_allow_resume(VCHIQ_STATE_T *state)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       int resume = 0;
+       int ret = -1;
+
+       if (!arm_state)
+               goto out;
+
+       vchiq_log_trace(vchiq_susp_log_level, "%s", __func__);
+
+       write_lock_bh(&arm_state->susp_res_lock);
+       unblock_resume(arm_state);
+       resume = vchiq_check_resume(state);
+       write_unlock_bh(&arm_state->susp_res_lock);
+
+       if (resume) {
+               if (wait_for_completion_interruptible(
+                       &arm_state->vc_resume_complete) < 0) {
+                       vchiq_log_error(vchiq_susp_log_level,
+                               "%s interrupted", __func__);
+                       /* failed, cannot accurately derive suspend
+                        * state, so exit early. */
+                       goto out;
+               }
+       }
+
+       read_lock_bh(&arm_state->susp_res_lock);
+       if (arm_state->vc_suspend_state == VC_SUSPEND_SUSPENDED) {
+               vchiq_log_info(vchiq_susp_log_level,
+                               "%s: Videocore remains suspended", __func__);
+       } else {
+               vchiq_log_info(vchiq_susp_log_level,
+                               "%s: Videocore resumed", __func__);
+               ret = 0;
+       }
+       read_unlock_bh(&arm_state->susp_res_lock);
+out:
+       vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, ret);
+       return ret;
+}
+
+/* This function should be called with the write lock held */
+int
+vchiq_check_resume(VCHIQ_STATE_T *state)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       int resume = 0;
+
+       if (!arm_state)
+               goto out;
+
+       vchiq_log_trace(vchiq_susp_log_level, "%s", __func__);
+
+       if (need_resume(state)) {
+               set_resume_state(arm_state, VC_RESUME_REQUESTED);
+               request_poll(state, NULL, 0);
+               resume = 1;
+       }
+
+out:
+       vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__);
+       return resume;
+}
+
+void
+vchiq_platform_check_resume(VCHIQ_STATE_T *state)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       int res = 0;
+
+       if (!arm_state)
+               goto out;
+
+       vchiq_log_trace(vchiq_susp_log_level, "%s", __func__);
+
+       write_lock_bh(&arm_state->susp_res_lock);
+       if (arm_state->wake_address == 0) {
+               vchiq_log_info(vchiq_susp_log_level,
+                                       "%s: already awake", __func__);
+               goto unlock;
+       }
+       if (arm_state->vc_resume_state == VC_RESUME_IN_PROGRESS) {
+               vchiq_log_info(vchiq_susp_log_level,
+                                       "%s: already resuming", __func__);
+               goto unlock;
+       }
+
+       if (arm_state->vc_resume_state == VC_RESUME_REQUESTED) {
+               set_resume_state(arm_state, VC_RESUME_IN_PROGRESS);
+               res = 1;
+       } else
+               vchiq_log_trace(vchiq_susp_log_level,
+                               "%s: not resuming (resume state %s)", __func__,
+                               resume_state_names[arm_state->vc_resume_state +
+                                                       VC_RESUME_NUM_OFFSET]);
+
+unlock:
+       write_unlock_bh(&arm_state->susp_res_lock);
+
+       if (res)
+               vchiq_platform_resume(state);
+
+out:
+       vchiq_log_trace(vchiq_susp_log_level, "%s exit", __func__);
+       return;
+
+}
+
+
+
+VCHIQ_STATUS_T
+vchiq_use_internal(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service,
+               enum USE_TYPE_E use_type)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       VCHIQ_STATUS_T ret = VCHIQ_SUCCESS;
+       char entity[16];
+       int *entity_uc;
+       int local_uc, local_entity_uc;
+
+       if (!arm_state)
+               goto out;
+
+       vchiq_log_trace(vchiq_susp_log_level, "%s", __func__);
+
+       if (use_type == USE_TYPE_VCHIQ) {
+               sprintf(entity, "VCHIQ:   ");
+               entity_uc = &arm_state->peer_use_count;
+       } else if (service) {
+               sprintf(entity, "%c%c%c%c:%03d",
+                       VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc),
+                       service->client_id);
+               entity_uc = &service->service_use_count;
+       } else {
+               vchiq_log_error(vchiq_susp_log_level, "%s null service "
+                               "ptr", __func__);
+               ret = VCHIQ_ERROR;
+               goto out;
+       }
+
+       write_lock_bh(&arm_state->susp_res_lock);
+       while (arm_state->resume_blocked) {
+               /* If we call 'use' while force suspend is waiting for suspend,
+                * then we're about to block the thread which the force is
+                * waiting to complete, so we're bound to just time out. In this
+                * case, set the suspend state such that the wait will be
+                * canceled, so we can complete as quickly as possible. */
+               if (arm_state->resume_blocked && arm_state->vc_suspend_state ==
+                               VC_SUSPEND_IDLE) {
+                       set_suspend_state(arm_state, VC_SUSPEND_FORCE_CANCELED);
+                       break;
+               }
+               /* If suspend is already in progress then we need to block */
+               if (!try_wait_for_completion(&arm_state->resume_blocker)) {
+                       /* Indicate that there are threads waiting on the resume
+                        * blocker.  These need to be allowed to complete before
+                        * a _second_ call to force suspend can complete,
+                        * otherwise low priority threads might never actually
+                        * continue */
+                       arm_state->blocked_count++;
+                       write_unlock_bh(&arm_state->susp_res_lock);
+                       vchiq_log_info(vchiq_susp_log_level, "%s %s resume "
+                               "blocked - waiting...", __func__, entity);
+                       if (wait_for_completion_killable(
+                                       &arm_state->resume_blocker) != 0) {
+                               vchiq_log_error(vchiq_susp_log_level, "%s %s "
+                                       "wait for resume blocker interrupted",
+                                       __func__, entity);
+                               ret = VCHIQ_ERROR;
+                               write_lock_bh(&arm_state->susp_res_lock);
+                               arm_state->blocked_count--;
+                               write_unlock_bh(&arm_state->susp_res_lock);
+                               goto out;
+                       }
+                       vchiq_log_info(vchiq_susp_log_level, "%s %s resume "
+                               "unblocked", __func__, entity);
+                       write_lock_bh(&arm_state->susp_res_lock);
+                       if (--arm_state->blocked_count == 0)
+                               complete_all(&arm_state->blocked_blocker);
+               }
+       }
+
+       stop_suspend_timer(arm_state);
+
+       local_uc = ++arm_state->videocore_use_count;
+       local_entity_uc = ++(*entity_uc);
+
+       /* If there's a pending request which hasn't yet been serviced then
+        * just clear it.  If we're past VC_SUSPEND_REQUESTED state then
+        * vc_resume_complete will block until we either resume or fail to
+        * suspend */
+       if (arm_state->vc_suspend_state <= VC_SUSPEND_REQUESTED)
+               set_suspend_state(arm_state, VC_SUSPEND_IDLE);
+
+       if ((use_type != USE_TYPE_SERVICE_NO_RESUME) && need_resume(state)) {
+               set_resume_state(arm_state, VC_RESUME_REQUESTED);
+               vchiq_log_info(vchiq_susp_log_level,
+                       "%s %s count %d, state count %d",
+                       __func__, entity, local_entity_uc, local_uc);
+               request_poll(state, NULL, 0);
+       } else
+               vchiq_log_trace(vchiq_susp_log_level,
+                       "%s %s count %d, state count %d",
+                       __func__, entity, *entity_uc, local_uc);
+
+
+       write_unlock_bh(&arm_state->susp_res_lock);
+
+       /* Completion is in a done state when we're not suspended, so this won't
+        * block for the non-suspended case. */
+       if (!try_wait_for_completion(&arm_state->vc_resume_complete)) {
+               vchiq_log_info(vchiq_susp_log_level, "%s %s wait for resume",
+                       __func__, entity);
+               if (wait_for_completion_killable(
+                               &arm_state->vc_resume_complete) != 0) {
+                       vchiq_log_error(vchiq_susp_log_level, "%s %s wait for "
+                               "resume interrupted", __func__, entity);
+                       ret = VCHIQ_ERROR;
+                       goto out;
+               }
+               vchiq_log_info(vchiq_susp_log_level, "%s %s resumed", __func__,
+                       entity);
+       }
+
+       if (ret == VCHIQ_SUCCESS) {
+               VCHIQ_STATUS_T status = VCHIQ_SUCCESS;
+               long ack_cnt = atomic_xchg(&arm_state->ka_use_ack_count, 0);
+               while (ack_cnt && (status == VCHIQ_SUCCESS)) {
+                       /* Send the use notify to videocore */
+                       status = vchiq_send_remote_use_active(state);
+                       if (status == VCHIQ_SUCCESS)
+                               ack_cnt--;
+                       else
+                               atomic_add(ack_cnt,
+                                       &arm_state->ka_use_ack_count);
+               }
+       }
+
+out:
+       vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, ret);
+       return ret;
+}
+
+VCHIQ_STATUS_T
+vchiq_release_internal(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       VCHIQ_STATUS_T ret = VCHIQ_SUCCESS;
+       char entity[16];
+       int *entity_uc;
+       int local_uc, local_entity_uc;
+
+       if (!arm_state)
+               goto out;
+
+       vchiq_log_trace(vchiq_susp_log_level, "%s", __func__);
+
+       if (service) {
+               sprintf(entity, "%c%c%c%c:%03d",
+                       VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc),
+                       service->client_id);
+               entity_uc = &service->service_use_count;
+       } else {
+               sprintf(entity, "PEER:   ");
+               entity_uc = &arm_state->peer_use_count;
+       }
+
+       write_lock_bh(&arm_state->susp_res_lock);
+       if (!arm_state->videocore_use_count || !(*entity_uc)) {
+               /* Don't use BUG_ON - don't allow user thread to crash kernel */
+               WARN_ON(!arm_state->videocore_use_count);
+               WARN_ON(!(*entity_uc));
+               ret = VCHIQ_ERROR;
+               goto unlock;
+       }
+       local_uc = --arm_state->videocore_use_count;
+       local_entity_uc = --(*entity_uc);
+
+       if (!vchiq_videocore_wanted(state)) {
+               if (vchiq_platform_use_suspend_timer() &&
+                               !arm_state->resume_blocked) {
+                       /* Only use the timer if we're not trying to force
+                        * suspend (=> resume_blocked) */
+                       start_suspend_timer(arm_state);
+               } else {
+                       vchiq_log_info(vchiq_susp_log_level,
+                               "%s %s count %d, state count %d - suspending",
+                               __func__, entity, *entity_uc,
+                               arm_state->videocore_use_count);
+                       vchiq_arm_vcsuspend(state);
+               }
+       } else
+               vchiq_log_trace(vchiq_susp_log_level,
+                       "%s %s count %d, state count %d",
+                       __func__, entity, *entity_uc,
+                       arm_state->videocore_use_count);
+
+unlock:
+       write_unlock_bh(&arm_state->susp_res_lock);
+
+out:
+       vchiq_log_trace(vchiq_susp_log_level, "%s exit %d", __func__, ret);
+       return ret;
+}
+
+void
+vchiq_on_remote_use(VCHIQ_STATE_T *state)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       vchiq_log_trace(vchiq_susp_log_level, "%s", __func__);
+       atomic_inc(&arm_state->ka_use_count);
+       complete(&arm_state->ka_evt);
+}
+
+void
+vchiq_on_remote_release(VCHIQ_STATE_T *state)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       vchiq_log_trace(vchiq_susp_log_level, "%s", __func__);
+       atomic_inc(&arm_state->ka_release_count);
+       complete(&arm_state->ka_evt);
+}
+
+VCHIQ_STATUS_T
+vchiq_use_service_internal(VCHIQ_SERVICE_T *service)
+{
+       return vchiq_use_internal(service->state, service, USE_TYPE_SERVICE);
+}
+
+VCHIQ_STATUS_T
+vchiq_release_service_internal(VCHIQ_SERVICE_T *service)
+{
+       return vchiq_release_internal(service->state, service);
+}
+
+static void suspend_timer_callback(unsigned long context)
+{
+       VCHIQ_STATE_T *state = (VCHIQ_STATE_T *)context;
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       if (!arm_state)
+               goto out;
+       vchiq_log_info(vchiq_susp_log_level,
+               "%s - suspend timer expired - check suspend", __func__);
+       vchiq_check_suspend(state);
+out:
+       return;
+}
+
+VCHIQ_STATUS_T
+vchiq_use_service_no_resume(VCHIQ_SERVICE_HANDLE_T handle)
+{
+       VCHIQ_STATUS_T ret = VCHIQ_ERROR;
+       VCHIQ_SERVICE_T *service = find_service_by_handle(handle);
+       if (service) {
+               ret = vchiq_use_internal(service->state, service,
+                               USE_TYPE_SERVICE_NO_RESUME);
+               unlock_service(service);
+       }
+       return ret;
+}
+
+VCHIQ_STATUS_T
+vchiq_use_service(VCHIQ_SERVICE_HANDLE_T handle)
+{
+       VCHIQ_STATUS_T ret = VCHIQ_ERROR;
+       VCHIQ_SERVICE_T *service = find_service_by_handle(handle);
+       if (service) {
+               ret = vchiq_use_internal(service->state, service,
+                               USE_TYPE_SERVICE);
+               unlock_service(service);
+       }
+       return ret;
+}
+
+VCHIQ_STATUS_T
+vchiq_release_service(VCHIQ_SERVICE_HANDLE_T handle)
+{
+       VCHIQ_STATUS_T ret = VCHIQ_ERROR;
+       VCHIQ_SERVICE_T *service = find_service_by_handle(handle);
+       if (service) {
+               ret = vchiq_release_internal(service->state, service);
+               unlock_service(service);
+       }
+       return ret;
+}
+
+void
+vchiq_dump_service_use_state(VCHIQ_STATE_T *state)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       int i, j = 0;
+       /* Only dump 64 services */
+       static const int local_max_services = 64;
+       /* If there's more than 64 services, only dump ones with
+        * non-zero counts */
+       int only_nonzero = 0;
+       static const char *nz = "<-- preventing suspend";
+
+       enum vc_suspend_status vc_suspend_state;
+       enum vc_resume_status  vc_resume_state;
+       int peer_count;
+       int vc_use_count;
+       int active_services;
+       struct service_data_struct {
+               int fourcc;
+               int clientid;
+               int use_count;
+       } service_data[local_max_services];
+
+       if (!arm_state)
+               return;
+
+       read_lock_bh(&arm_state->susp_res_lock);
+       vc_suspend_state = arm_state->vc_suspend_state;
+       vc_resume_state  = arm_state->vc_resume_state;
+       peer_count = arm_state->peer_use_count;
+       vc_use_count = arm_state->videocore_use_count;
+       active_services = state->unused_service;
+       if (active_services > local_max_services)
+               only_nonzero = 1;
+
+       for (i = 0; (i < active_services) && (j < local_max_services); i++) {
+               VCHIQ_SERVICE_T *service_ptr = state->services[i];
+               if (!service_ptr)
+                       continue;
+
+               if (only_nonzero && !service_ptr->service_use_count)
+                       continue;
+
+               if (service_ptr->srvstate != VCHIQ_SRVSTATE_FREE) {
+                       service_data[j].fourcc = service_ptr->base.fourcc;
+                       service_data[j].clientid = service_ptr->client_id;
+                       service_data[j++].use_count = service_ptr->
+                                                       service_use_count;
+               }
+       }
+
+       read_unlock_bh(&arm_state->susp_res_lock);
+
+       vchiq_log_warning(vchiq_susp_log_level,
+               "-- Videcore suspend state: %s --",
+               suspend_state_names[vc_suspend_state + VC_SUSPEND_NUM_OFFSET]);
+       vchiq_log_warning(vchiq_susp_log_level,
+               "-- Videcore resume state: %s --",
+               resume_state_names[vc_resume_state + VC_RESUME_NUM_OFFSET]);
+
+       if (only_nonzero)
+               vchiq_log_warning(vchiq_susp_log_level, "Too many active "
+                       "services (%d).  Only dumping up to first %d services "
+                       "with non-zero use-count", active_services,
+                       local_max_services);
+
+       for (i = 0; i < j; i++) {
+               vchiq_log_warning(vchiq_susp_log_level,
+                       "----- %c%c%c%c:%d service count %d %s",
+                       VCHIQ_FOURCC_AS_4CHARS(service_data[i].fourcc),
+                       service_data[i].clientid,
+                       service_data[i].use_count,
+                       service_data[i].use_count ? nz : "");
+       }
+       vchiq_log_warning(vchiq_susp_log_level,
+               "----- VCHIQ use count count %d", peer_count);
+       vchiq_log_warning(vchiq_susp_log_level,
+               "--- Overall vchiq instance use count %d", vc_use_count);
+
+       vchiq_dump_platform_use_state(state);
+}
+
+VCHIQ_STATUS_T
+vchiq_check_service(VCHIQ_SERVICE_T *service)
+{
+       VCHIQ_ARM_STATE_T *arm_state;
+       VCHIQ_STATUS_T ret = VCHIQ_ERROR;
+
+       if (!service || !service->state)
+               goto out;
+
+       vchiq_log_trace(vchiq_susp_log_level, "%s", __func__);
+
+       arm_state = vchiq_platform_get_arm_state(service->state);
+
+       read_lock_bh(&arm_state->susp_res_lock);
+       if (service->service_use_count)
+               ret = VCHIQ_SUCCESS;
+       read_unlock_bh(&arm_state->susp_res_lock);
+
+       if (ret == VCHIQ_ERROR) {
+               vchiq_log_error(vchiq_susp_log_level,
+                       "%s ERROR - %c%c%c%c:%d service count %d, "
+                       "state count %d, videocore suspend state %s", __func__,
+                       VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc),
+                       service->client_id, service->service_use_count,
+                       arm_state->videocore_use_count,
+                       suspend_state_names[arm_state->vc_suspend_state +
+                                               VC_SUSPEND_NUM_OFFSET]);
+               vchiq_dump_service_use_state(service->state);
+       }
+out:
+       return ret;
+}
+
+/* stub functions */
+void vchiq_on_remote_use_active(VCHIQ_STATE_T *state)
+{
+       (void)state;
+}
+
+void vchiq_platform_conn_state_changed(VCHIQ_STATE_T *state,
+       VCHIQ_CONNSTATE_T oldstate, VCHIQ_CONNSTATE_T newstate)
+{
+       VCHIQ_ARM_STATE_T *arm_state = vchiq_platform_get_arm_state(state);
+       vchiq_log_info(vchiq_susp_log_level, "%d: %s->%s", state->id,
+               get_conn_state_name(oldstate), get_conn_state_name(newstate));
+       if (state->conn_state == VCHIQ_CONNSTATE_CONNECTED) {
+               write_lock_bh(&arm_state->susp_res_lock);
+               if (!arm_state->first_connect) {
+                       char threadname[10];
+                       arm_state->first_connect = 1;
+                       write_unlock_bh(&arm_state->susp_res_lock);
+                       snprintf(threadname, sizeof(threadname), "VCHIQka-%d",
+                               state->id);
+                       arm_state->ka_thread = kthread_create(
+                               &vchiq_keepalive_thread_func,
+                               (void *)state,
+                               threadname);
+                       if (arm_state->ka_thread == NULL) {
+                               vchiq_log_error(vchiq_susp_log_level,
+                                       "vchiq: FATAL: couldn't create thread %s",
+                                       threadname);
+                       } else {
+                               wake_up_process(arm_state->ka_thread);
+                       }
+               } else
+                       write_unlock_bh(&arm_state->susp_res_lock);
+       }
+}
+
+
+/****************************************************************************
+*
+*   vchiq_init - called when the module is loaded.
+*
+***************************************************************************/
+
+static int __init
+vchiq_init(void)
+{
+       int err;
+       void *ptr_err;
+
+       /* create proc entries */
+       err = vchiq_proc_init();
+       if (err != 0)
+               goto failed_proc_init;
+
+       err = alloc_chrdev_region(&vchiq_devid, VCHIQ_MINOR, 1, DEVICE_NAME);
+       if (err != 0) {
+               vchiq_log_error(vchiq_arm_log_level,
+                       "Unable to allocate device number");
+               goto failed_alloc_chrdev;
+       }
+       cdev_init(&vchiq_cdev, &vchiq_fops);
+       vchiq_cdev.owner = THIS_MODULE;
+       err = cdev_add(&vchiq_cdev, vchiq_devid, 1);
+       if (err != 0) {
+               vchiq_log_error(vchiq_arm_log_level,
+                       "Unable to register device");
+               goto failed_cdev_add;
+       }
+
+       /* create sysfs entries */
+       vchiq_class = class_create(THIS_MODULE, DEVICE_NAME);
+       ptr_err = vchiq_class;
+       if (IS_ERR(ptr_err))
+               goto failed_class_create;
+
+       vchiq_dev = device_create(vchiq_class, NULL,
+               vchiq_devid, NULL, "vchiq");
+       ptr_err = vchiq_dev;
+       if (IS_ERR(ptr_err))
+               goto failed_device_create;
+
+       err = vchiq_platform_init(&g_state);
+       if (err != 0)
+               goto failed_platform_init;
+
+       vchiq_log_info(vchiq_arm_log_level,
+               "vchiq: initialised - version %d (min %d), device %d.%d",
+               VCHIQ_VERSION, VCHIQ_VERSION_MIN,
+               MAJOR(vchiq_devid), MINOR(vchiq_devid));
+
+       return 0;
+
+failed_platform_init:
+       device_destroy(vchiq_class, vchiq_devid);
+failed_device_create:
+       class_destroy(vchiq_class);
+failed_class_create:
+       cdev_del(&vchiq_cdev);
+       err = PTR_ERR(ptr_err);
+failed_cdev_add:
+       unregister_chrdev_region(vchiq_devid, 1);
+failed_alloc_chrdev:
+       vchiq_proc_deinit();
+failed_proc_init:
+       vchiq_log_warning(vchiq_arm_log_level, "could not load vchiq");
+       return err;
+}
+
+static int vchiq_instance_get_use_count(VCHIQ_INSTANCE_T instance)
+{
+       VCHIQ_SERVICE_T *service;
+       int use_count = 0, i;
+       i = 0;
+       while ((service = next_service_by_instance(instance->state,
+               instance, &i)) != NULL) {
+               use_count += service->service_use_count;
+               unlock_service(service);
+       }
+       return use_count;
+}
+
+/* read the per-process use-count */
+static int proc_read_use_count(char *page, char **start,
+                              off_t off, int count,
+                              int *eof, void *data)
+{
+       VCHIQ_INSTANCE_T instance = data;
+       int len, use_count;
+
+       use_count = vchiq_instance_get_use_count(instance);
+       len = snprintf(page+off, count, "%d\n", use_count);
+
+       return len;
+}
+
+/* add an instance (process) to the proc entries */
+static int vchiq_proc_add_instance(VCHIQ_INSTANCE_T instance)
+{
+#if 1
+       return 0;
+#else
+       char pidstr[32];
+       struct proc_dir_entry *top, *use_count;
+       struct proc_dir_entry *clients = vchiq_clients_top();
+       int pid = instance->pid;
+
+       snprintf(pidstr, sizeof(pidstr), "%d", pid);
+       top = proc_mkdir(pidstr, clients);
+       if (!top)
+               goto fail_top;
+
+       use_count = create_proc_read_entry("use_count",
+                                          0444, top,
+                                          proc_read_use_count,
+                                          instance);
+       if (!use_count)
+               goto fail_use_count;
+
+       instance->proc_entry = top;
+
+       return 0;
+
+fail_use_count:
+       remove_proc_entry(top->name, clients);
+fail_top:
+       return -ENOMEM;
+#endif
+}
+
+static void vchiq_proc_remove_instance(VCHIQ_INSTANCE_T instance)
+{
+#if 0
+       struct proc_dir_entry *clients = vchiq_clients_top();
+       remove_proc_entry("use_count", instance->proc_entry);
+       remove_proc_entry(instance->proc_entry->name, clients);
+#endif
+}
+
+/****************************************************************************
+*
+*   vchiq_exit - called when the module is unloaded.
+*
+***************************************************************************/
+
+static void __exit
+vchiq_exit(void)
+{
+       vchiq_platform_exit(&g_state);
+       device_destroy(vchiq_class, vchiq_devid);
+       class_destroy(vchiq_class);
+       cdev_del(&vchiq_cdev);
+       unregister_chrdev_region(vchiq_devid, 1);
+}
+
+module_init(vchiq_init);
+module_exit(vchiq_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Broadcom Corporation");
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.h
@@ -0,0 +1,212 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHIQ_ARM_H
+#define VCHIQ_ARM_H
+
+#include <linux/mutex.h>
+#include <linux/semaphore.h>
+#include <linux/atomic.h>
+#include "vchiq_core.h"
+
+
+enum vc_suspend_status {
+       VC_SUSPEND_FORCE_CANCELED = -3, /* Force suspend canceled, too busy */
+       VC_SUSPEND_REJECTED = -2,  /* Videocore rejected suspend request */
+       VC_SUSPEND_FAILED = -1,    /* Videocore suspend failed */
+       VC_SUSPEND_IDLE = 0,       /* VC active, no suspend actions */
+       VC_SUSPEND_REQUESTED,      /* User has requested suspend */
+       VC_SUSPEND_IN_PROGRESS,    /* Slot handler has recvd suspend request */
+       VC_SUSPEND_SUSPENDED       /* Videocore suspend succeeded */
+};
+
+enum vc_resume_status {
+       VC_RESUME_FAILED = -1, /* Videocore resume failed */
+       VC_RESUME_IDLE = 0,    /* VC suspended, no resume actions */
+       VC_RESUME_REQUESTED,   /* User has requested resume */
+       VC_RESUME_IN_PROGRESS, /* Slot handler has received resume request */
+       VC_RESUME_RESUMED      /* Videocore resumed successfully (active) */
+};
+
+
+enum USE_TYPE_E {
+       USE_TYPE_SERVICE,
+       USE_TYPE_SERVICE_NO_RESUME,
+       USE_TYPE_VCHIQ
+};
+
+
+
+typedef struct vchiq_arm_state_struct {
+       /* Keepalive-related data */
+       struct task_struct *ka_thread;
+       struct completion ka_evt;
+       atomic_t ka_use_count;
+       atomic_t ka_use_ack_count;
+       atomic_t ka_release_count;
+
+       struct completion vc_suspend_complete;
+       struct completion vc_resume_complete;
+
+       rwlock_t susp_res_lock;
+       enum vc_suspend_status vc_suspend_state;
+       enum vc_resume_status vc_resume_state;
+
+       unsigned int wake_address;
+
+       struct timer_list suspend_timer;
+       int suspend_timer_timeout;
+       int suspend_timer_running;
+
+       /* Global use count for videocore.
+       ** This is equal to the sum of the use counts for all services.  When
+       ** this hits zero the videocore suspend procedure will be initiated.
+       */
+       int videocore_use_count;
+
+       /* Use count to track requests from videocore peer.
+       ** This use count is not associated with a service, so needs to be
+       ** tracked separately with the state.
+       */
+       int peer_use_count;
+
+       /* Flag to indicate whether resume is blocked.  This happens when the
+       ** ARM is suspending
+       */
+       struct completion resume_blocker;
+       int resume_blocked;
+       struct completion blocked_blocker;
+       int blocked_count;
+
+       int autosuspend_override;
+
+       /* Flag to indicate that the first vchiq connect has made it through.
+       ** This means that both sides should be fully ready, and we should
+       ** be able to suspend after this point.
+       */
+       int first_connect;
+
+       unsigned long long suspend_start_time;
+       unsigned long long sleep_start_time;
+       unsigned long long resume_start_time;
+       unsigned long long last_wake_time;
+
+} VCHIQ_ARM_STATE_T;
+
+extern int vchiq_arm_log_level;
+extern int vchiq_susp_log_level;
+
+extern int __init
+vchiq_platform_init(VCHIQ_STATE_T *state);
+
+extern void __exit
+vchiq_platform_exit(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATE_T *
+vchiq_get_state(void);
+
+extern VCHIQ_STATUS_T
+vchiq_arm_vcsuspend(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATUS_T
+vchiq_arm_force_suspend(VCHIQ_STATE_T *state);
+
+extern int
+vchiq_arm_allow_resume(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATUS_T
+vchiq_arm_vcresume(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATUS_T
+vchiq_arm_init_state(VCHIQ_STATE_T *state, VCHIQ_ARM_STATE_T *arm_state);
+
+extern int
+vchiq_check_resume(VCHIQ_STATE_T *state);
+
+extern void
+vchiq_check_suspend(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATUS_T
+vchiq_use_service(VCHIQ_SERVICE_HANDLE_T handle);
+
+extern VCHIQ_STATUS_T
+vchiq_release_service(VCHIQ_SERVICE_HANDLE_T handle);
+
+extern VCHIQ_STATUS_T
+vchiq_check_service(VCHIQ_SERVICE_T *service);
+
+extern VCHIQ_STATUS_T
+vchiq_platform_suspend(VCHIQ_STATE_T *state);
+
+extern int
+vchiq_platform_videocore_wanted(VCHIQ_STATE_T *state);
+
+extern int
+vchiq_platform_use_suspend_timer(void);
+
+extern void
+vchiq_dump_platform_use_state(VCHIQ_STATE_T *state);
+
+extern void
+vchiq_dump_service_use_state(VCHIQ_STATE_T *state);
+
+extern VCHIQ_ARM_STATE_T*
+vchiq_platform_get_arm_state(VCHIQ_STATE_T *state);
+
+extern int
+vchiq_videocore_wanted(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATUS_T
+vchiq_use_internal(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service,
+               enum USE_TYPE_E use_type);
+extern VCHIQ_STATUS_T
+vchiq_release_internal(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service);
+
+void
+set_suspend_state(VCHIQ_ARM_STATE_T *arm_state,
+       enum vc_suspend_status new_state);
+
+void
+set_resume_state(VCHIQ_ARM_STATE_T *arm_state,
+       enum vc_resume_status new_state);
+
+void
+start_suspend_timer(VCHIQ_ARM_STATE_T *arm_state);
+
+extern int vchiq_proc_init(void);
+extern void vchiq_proc_deinit(void);
+extern struct proc_dir_entry *vchiq_proc_top(void);
+extern struct proc_dir_entry *vchiq_clients_top(void);
+
+
+#endif /* VCHIQ_ARM_H */
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_build_info.h
@@ -0,0 +1,37 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+const char *vchiq_get_build_hostname(void);
+const char *vchiq_get_build_version(void);
+const char *vchiq_get_build_time(void);
+const char *vchiq_get_build_date(void);
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_cfg.h
@@ -0,0 +1,60 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHIQ_CFG_H
+#define VCHIQ_CFG_H
+
+#define VCHIQ_MAGIC              VCHIQ_MAKE_FOURCC('V', 'C', 'H', 'I')
+/* The version of VCHIQ - change with any non-trivial change */
+#define VCHIQ_VERSION            6
+/* The minimum compatible version - update to match VCHIQ_VERSION with any
+** incompatible change */
+#define VCHIQ_VERSION_MIN        3
+
+#define VCHIQ_MAX_STATES         1
+#define VCHIQ_MAX_SERVICES       4096
+#define VCHIQ_MAX_SLOTS          128
+#define VCHIQ_MAX_SLOTS_PER_SIDE 64
+
+#define VCHIQ_NUM_CURRENT_BULKS        32
+#define VCHIQ_NUM_SERVICE_BULKS        4
+
+#ifndef VCHIQ_ENABLE_DEBUG
+#define VCHIQ_ENABLE_DEBUG             1
+#endif
+
+#ifndef VCHIQ_ENABLE_STATS
+#define VCHIQ_ENABLE_STATS             1
+#endif
+
+#endif /* VCHIQ_CFG_H */
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.c
@@ -0,0 +1,119 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "vchiq_connected.h"
+#include "vchiq_core.h"
+#include <linux/module.h>
+#include <linux/mutex.h>
+
+#define  MAX_CALLBACKS  10
+
+static   int                        g_connected;
+static   int                        g_num_deferred_callbacks;
+static   VCHIQ_CONNECTED_CALLBACK_T g_deferred_callback[MAX_CALLBACKS];
+static   int                        g_once_init;
+static   struct mutex               g_connected_mutex;
+
+/****************************************************************************
+*
+* Function to initialize our lock.
+*
+***************************************************************************/
+
+static void connected_init(void)
+{
+       if (!g_once_init) {
+               mutex_init(&g_connected_mutex);
+               g_once_init = 1;
+       }
+}
+
+/****************************************************************************
+*
+* This function is used to defer initialization until the vchiq stack is
+* initialized. If the stack is already initialized, then the callback will
+* be made immediately, otherwise it will be deferred until
+* vchiq_call_connected_callbacks is called.
+*
+***************************************************************************/
+
+void vchiq_add_connected_callback(VCHIQ_CONNECTED_CALLBACK_T callback)
+{
+       connected_init();
+
+       if (mutex_lock_interruptible(&g_connected_mutex) != 0)
+               return;
+
+       if (g_connected)
+               /* We're already connected. Call the callback immediately. */
+
+               callback();
+       else {
+               if (g_num_deferred_callbacks >= MAX_CALLBACKS)
+                       vchiq_log_error(vchiq_core_log_level,
+                               "There already %d callback registered - "
+                               "please increase MAX_CALLBACKS",
+                               g_num_deferred_callbacks);
+               else {
+                       g_deferred_callback[g_num_deferred_callbacks] =
+                               callback;
+                       g_num_deferred_callbacks++;
+               }
+       }
+       mutex_unlock(&g_connected_mutex);
+}
+
+/****************************************************************************
+*
+* This function is called by the vchiq stack once it has been connected to
+* the videocore and clients can start to use the stack.
+*
+***************************************************************************/
+
+void vchiq_call_connected_callbacks(void)
+{
+       int i;
+
+       connected_init();
+
+       if (mutex_lock_interruptible(&g_connected_mutex) != 0)
+               return;
+
+       for (i = 0; i <  g_num_deferred_callbacks; i++)
+               g_deferred_callback[i]();
+
+       g_num_deferred_callbacks = 0;
+       g_connected = 1;
+       mutex_unlock(&g_connected_mutex);
+}
+EXPORT_SYMBOL(vchiq_add_connected_callback);
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.h
@@ -0,0 +1,50 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHIQ_CONNECTED_H
+#define VCHIQ_CONNECTED_H
+
+/* ---- Include Files ----------------------------------------------------- */
+
+/* ---- Constants and Types ---------------------------------------------- */
+
+typedef void (*VCHIQ_CONNECTED_CALLBACK_T)(void);
+
+/* ---- Variable Externs ------------------------------------------------- */
+
+/* ---- Function Prototypes ---------------------------------------------- */
+
+void vchiq_add_connected_callback(VCHIQ_CONNECTED_CALLBACK_T callback);
+void vchiq_call_connected_callbacks(void);
+
+#endif /* VCHIQ_CONNECTED_H */
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.c
@@ -0,0 +1,3824 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "vchiq_core.h"
+
+#define VCHIQ_SLOT_HANDLER_STACK 8192
+
+#define HANDLE_STATE_SHIFT 12
+
+#define SLOT_INFO_FROM_INDEX(state, index) (state->slot_info + (index))
+#define SLOT_DATA_FROM_INDEX(state, index) (state->slot_data + (index))
+#define SLOT_INDEX_FROM_DATA(state, data) \
+       (((unsigned int)((char *)data - (char *)state->slot_data)) / \
+       VCHIQ_SLOT_SIZE)
+#define SLOT_INDEX_FROM_INFO(state, info) \
+       ((unsigned int)(info - state->slot_info))
+#define SLOT_QUEUE_INDEX_FROM_POS(pos) \
+       ((int)((unsigned int)(pos) / VCHIQ_SLOT_SIZE))
+
+
+#define BULK_INDEX(x) (x & (VCHIQ_NUM_SERVICE_BULKS - 1))
+
+
+struct vchiq_open_payload {
+       int fourcc;
+       int client_id;
+       short version;
+       short version_min;
+};
+
+struct vchiq_openack_payload {
+       short version;
+};
+
+/* we require this for consistency between endpoints */
+vchiq_static_assert(sizeof(VCHIQ_HEADER_T) == 8);
+vchiq_static_assert(IS_POW2(sizeof(VCHIQ_HEADER_T)));
+vchiq_static_assert(IS_POW2(VCHIQ_NUM_CURRENT_BULKS));
+vchiq_static_assert(IS_POW2(VCHIQ_NUM_SERVICE_BULKS));
+vchiq_static_assert(IS_POW2(VCHIQ_MAX_SERVICES));
+vchiq_static_assert(VCHIQ_VERSION >= VCHIQ_VERSION_MIN);
+
+/* Run time control of log level, based on KERN_XXX level. */
+int vchiq_core_log_level = VCHIQ_LOG_DEFAULT;
+int vchiq_core_msg_log_level = VCHIQ_LOG_DEFAULT;
+int vchiq_sync_log_level = VCHIQ_LOG_DEFAULT;
+
+static atomic_t pause_bulks_count = ATOMIC_INIT(0);
+
+static DEFINE_SPINLOCK(service_spinlock);
+DEFINE_SPINLOCK(bulk_waiter_spinlock);
+DEFINE_SPINLOCK(quota_spinlock);
+
+VCHIQ_STATE_T *vchiq_states[VCHIQ_MAX_STATES];
+static unsigned int handle_seq;
+
+static const char *const srvstate_names[] = {
+       "FREE",
+       "HIDDEN",
+       "LISTENING",
+       "OPENING",
+       "OPEN",
+       "OPENSYNC",
+       "CLOSESENT",
+       "CLOSERECVD",
+       "CLOSEWAIT",
+       "CLOSED"
+};
+
+static const char *const reason_names[] = {
+       "SERVICE_OPENED",
+       "SERVICE_CLOSED",
+       "MESSAGE_AVAILABLE",
+       "BULK_TRANSMIT_DONE",
+       "BULK_RECEIVE_DONE",
+       "BULK_TRANSMIT_ABORTED",
+       "BULK_RECEIVE_ABORTED"
+};
+
+static const char *const conn_state_names[] = {
+       "DISCONNECTED",
+       "CONNECTING",
+       "CONNECTED",
+       "PAUSING",
+       "PAUSE_SENT",
+       "PAUSED",
+       "RESUMING",
+       "PAUSE_TIMEOUT",
+       "RESUME_TIMEOUT"
+};
+
+
+static void
+release_message_sync(VCHIQ_STATE_T *state, VCHIQ_HEADER_T *header);
+
+static const char *msg_type_str(unsigned int msg_type)
+{
+       switch (msg_type) {
+       case VCHIQ_MSG_PADDING:       return "PADDING";
+       case VCHIQ_MSG_CONNECT:       return "CONNECT";
+       case VCHIQ_MSG_OPEN:          return "OPEN";
+       case VCHIQ_MSG_OPENACK:       return "OPENACK";
+       case VCHIQ_MSG_CLOSE:         return "CLOSE";
+       case VCHIQ_MSG_DATA:          return "DATA";
+       case VCHIQ_MSG_BULK_RX:       return "BULK_RX";
+       case VCHIQ_MSG_BULK_TX:       return "BULK_TX";
+       case VCHIQ_MSG_BULK_RX_DONE:  return "BULK_RX_DONE";
+       case VCHIQ_MSG_BULK_TX_DONE:  return "BULK_TX_DONE";
+       case VCHIQ_MSG_PAUSE:         return "PAUSE";
+       case VCHIQ_MSG_RESUME:        return "RESUME";
+       case VCHIQ_MSG_REMOTE_USE:    return "REMOTE_USE";
+       case VCHIQ_MSG_REMOTE_RELEASE:      return "REMOTE_RELEASE";
+       case VCHIQ_MSG_REMOTE_USE_ACTIVE:   return "REMOTE_USE_ACTIVE";
+       }
+       return "???";
+}
+
+static inline void
+vchiq_set_service_state(VCHIQ_SERVICE_T *service, int newstate)
+{
+       vchiq_log_info(vchiq_core_log_level, "%d: srv:%d %s->%s",
+               service->state->id, service->localport,
+               srvstate_names[service->srvstate],
+               srvstate_names[newstate]);
+       service->srvstate = newstate;
+}
+
+VCHIQ_SERVICE_T *
+find_service_by_handle(VCHIQ_SERVICE_HANDLE_T handle)
+{
+       VCHIQ_SERVICE_T *service;
+
+       spin_lock(&service_spinlock);
+       service = handle_to_service(handle);
+       if (service && (service->srvstate != VCHIQ_SRVSTATE_FREE) &&
+               (service->handle == handle)) {
+               BUG_ON(service->ref_count == 0);
+               service->ref_count++;
+       } else
+               service = NULL;
+       spin_unlock(&service_spinlock);
+
+       if (!service)
+               vchiq_log_info(vchiq_core_log_level,
+                       "Invalid service handle 0x%x", handle);
+
+       return service;
+}
+
+VCHIQ_SERVICE_T *
+find_service_by_port(VCHIQ_STATE_T *state, int localport)
+{
+       VCHIQ_SERVICE_T *service = NULL;
+       if ((unsigned int)localport <= VCHIQ_PORT_MAX) {
+               spin_lock(&service_spinlock);
+               service = state->services[localport];
+               if (service && (service->srvstate != VCHIQ_SRVSTATE_FREE)) {
+                       BUG_ON(service->ref_count == 0);
+                       service->ref_count++;
+               } else
+                       service = NULL;
+               spin_unlock(&service_spinlock);
+       }
+
+       if (!service)
+               vchiq_log_info(vchiq_core_log_level,
+                       "Invalid port %d", localport);
+
+       return service;
+}
+
+VCHIQ_SERVICE_T *
+find_service_for_instance(VCHIQ_INSTANCE_T instance,
+       VCHIQ_SERVICE_HANDLE_T handle) {
+       VCHIQ_SERVICE_T *service;
+
+       spin_lock(&service_spinlock);
+       service = handle_to_service(handle);
+       if (service && (service->srvstate != VCHIQ_SRVSTATE_FREE) &&
+               (service->handle == handle) &&
+               (service->instance == instance)) {
+               BUG_ON(service->ref_count == 0);
+               service->ref_count++;
+       } else
+               service = NULL;
+       spin_unlock(&service_spinlock);
+
+       if (!service)
+               vchiq_log_info(vchiq_core_log_level,
+                       "Invalid service handle 0x%x", handle);
+
+       return service;
+}
+
+VCHIQ_SERVICE_T *
+next_service_by_instance(VCHIQ_STATE_T *state, VCHIQ_INSTANCE_T instance,
+       int *pidx)
+{
+       VCHIQ_SERVICE_T *service = NULL;
+       int idx = *pidx;
+
+       spin_lock(&service_spinlock);
+       while (idx < state->unused_service) {
+               VCHIQ_SERVICE_T *srv = state->services[idx++];
+               if (srv && (srv->srvstate != VCHIQ_SRVSTATE_FREE) &&
+                       (srv->instance == instance)) {
+                       service = srv;
+                       BUG_ON(service->ref_count == 0);
+                       service->ref_count++;
+                       break;
+               }
+       }
+       spin_unlock(&service_spinlock);
+
+       *pidx = idx;
+
+       return service;
+}
+
+void
+lock_service(VCHIQ_SERVICE_T *service)
+{
+       spin_lock(&service_spinlock);
+       BUG_ON(!service || (service->ref_count == 0));
+       if (service)
+               service->ref_count++;
+       spin_unlock(&service_spinlock);
+}
+
+void
+unlock_service(VCHIQ_SERVICE_T *service)
+{
+       VCHIQ_STATE_T *state = service->state;
+       spin_lock(&service_spinlock);
+       BUG_ON(!service || (service->ref_count == 0));
+       if (service && service->ref_count) {
+               service->ref_count--;
+               if (!service->ref_count) {
+                       BUG_ON(service->srvstate != VCHIQ_SRVSTATE_FREE);
+                       state->services[service->localport] = NULL;
+               } else
+                       service = NULL;
+       }
+       spin_unlock(&service_spinlock);
+
+       if (service && service->userdata_term)
+               service->userdata_term(service->base.userdata);
+
+       kfree(service);
+}
+
+int
+vchiq_get_client_id(VCHIQ_SERVICE_HANDLE_T handle)
+{
+       VCHIQ_SERVICE_T *service = find_service_by_handle(handle);
+       int id;
+
+       id = service ? service->client_id : 0;
+       if (service)
+               unlock_service(service);
+
+       return id;
+}
+
+void *
+vchiq_get_service_userdata(VCHIQ_SERVICE_HANDLE_T handle)
+{
+       VCHIQ_SERVICE_T *service = handle_to_service(handle);
+
+       return service ? service->base.userdata : NULL;
+}
+
+int
+vchiq_get_service_fourcc(VCHIQ_SERVICE_HANDLE_T handle)
+{
+       VCHIQ_SERVICE_T *service = handle_to_service(handle);
+
+       return service ? service->base.fourcc : 0;
+}
+
+static void
+mark_service_closing_internal(VCHIQ_SERVICE_T *service, int sh_thread)
+{
+       VCHIQ_STATE_T *state = service->state;
+       VCHIQ_SERVICE_QUOTA_T *service_quota;
+
+       service->closing = 1;
+
+       /* Synchronise with other threads. */
+       mutex_lock(&state->recycle_mutex);
+       mutex_unlock(&state->recycle_mutex);
+       if (!sh_thread || (state->conn_state != VCHIQ_CONNSTATE_PAUSE_SENT)) {
+               /* If we're pausing then the slot_mutex is held until resume
+                * by the slot handler.  Therefore don't try to acquire this
+                * mutex if we're the slot handler and in the pause sent state.
+                * We don't need to in this case anyway. */
+               mutex_lock(&state->slot_mutex);
+               mutex_unlock(&state->slot_mutex);
+       }
+
+       /* Unblock any sending thread. */
+       service_quota = &state->service_quotas[service->localport];
+       up(&service_quota->quota_event);
+}
+
+static void
+mark_service_closing(VCHIQ_SERVICE_T *service)
+{
+       mark_service_closing_internal(service, 0);
+}
+
+static inline VCHIQ_STATUS_T
+make_service_callback(VCHIQ_SERVICE_T *service, VCHIQ_REASON_T reason,
+       VCHIQ_HEADER_T *header, void *bulk_userdata)
+{
+       VCHIQ_STATUS_T status;
+       vchiq_log_trace(vchiq_core_log_level, "%d: callback:%d (%s, %x, %x)",
+               service->state->id, service->localport, reason_names[reason],
+               (unsigned int)header, (unsigned int)bulk_userdata);
+       status = service->base.callback(reason, header, service->handle,
+               bulk_userdata);
+       if (status == VCHIQ_ERROR) {
+               vchiq_log_warning(vchiq_core_log_level,
+                       "%d: ignoring ERROR from callback to service %x",
+                       service->state->id, service->handle);
+               status = VCHIQ_SUCCESS;
+       }
+       return status;
+}
+
+inline void
+vchiq_set_conn_state(VCHIQ_STATE_T *state, VCHIQ_CONNSTATE_T newstate)
+{
+       VCHIQ_CONNSTATE_T oldstate = state->conn_state;
+       vchiq_log_info(vchiq_core_log_level, "%d: %s->%s", state->id,
+               conn_state_names[oldstate],
+               conn_state_names[newstate]);
+       state->conn_state = newstate;
+       vchiq_platform_conn_state_changed(state, oldstate, newstate);
+}
+
+static inline void
+remote_event_create(REMOTE_EVENT_T *event)
+{
+       event->armed = 0;
+       /* Don't clear the 'fired' flag because it may already have been set
+       ** by the other side. */
+       sema_init(event->event, 0);
+}
+
+static inline void
+remote_event_destroy(REMOTE_EVENT_T *event)
+{
+       (void)event;
+}
+
+static inline int
+remote_event_wait(REMOTE_EVENT_T *event)
+{
+       if (!event->fired) {
+               event->armed = 1;
+               dsb();
+               if (!event->fired) {
+                       if (down_interruptible(event->event) != 0) {
+                               event->armed = 0;
+                               return 0;
+                       }
+               }
+               event->armed = 0;
+               wmb();
+       }
+
+       event->fired = 0;
+       return 1;
+}
+
+static inline void
+remote_event_signal_local(REMOTE_EVENT_T *event)
+{
+       event->armed = 0;
+       up(event->event);
+}
+
+static inline void
+remote_event_poll(REMOTE_EVENT_T *event)
+{
+       if (event->fired && event->armed)
+               remote_event_signal_local(event);
+}
+
+void
+remote_event_pollall(VCHIQ_STATE_T *state)
+{
+       remote_event_poll(&state->local->sync_trigger);
+       remote_event_poll(&state->local->sync_release);
+       remote_event_poll(&state->local->trigger);
+       remote_event_poll(&state->local->recycle);
+}
+
+/* Round up message sizes so that any space at the end of a slot is always big
+** enough for a header. This relies on header size being a power of two, which
+** has been verified earlier by a static assertion. */
+
+static inline unsigned int
+calc_stride(unsigned int size)
+{
+       /* Allow room for the header */
+       size += sizeof(VCHIQ_HEADER_T);
+
+       /* Round up */
+       return (size + sizeof(VCHIQ_HEADER_T) - 1) & ~(sizeof(VCHIQ_HEADER_T)
+               - 1);
+}
+
+/* Called by the slot handler thread */
+static VCHIQ_SERVICE_T *
+get_listening_service(VCHIQ_STATE_T *state, int fourcc)
+{
+       int i;
+
+       WARN_ON(fourcc == VCHIQ_FOURCC_INVALID);
+
+       for (i = 0; i < state->unused_service; i++) {
+               VCHIQ_SERVICE_T *service = state->services[i];
+               if (service &&
+                       (service->public_fourcc == fourcc) &&
+                       ((service->srvstate == VCHIQ_SRVSTATE_LISTENING) ||
+                       ((service->srvstate == VCHIQ_SRVSTATE_OPEN) &&
+                       (service->remoteport == VCHIQ_PORT_FREE)))) {
+                       lock_service(service);
+                       return service;
+               }
+       }
+
+       return NULL;
+}
+
+/* Called by the slot handler thread */
+static VCHIQ_SERVICE_T *
+get_connected_service(VCHIQ_STATE_T *state, unsigned int port)
+{
+       int i;
+       for (i = 0; i < state->unused_service; i++) {
+               VCHIQ_SERVICE_T *service = state->services[i];
+               if (service && (service->srvstate == VCHIQ_SRVSTATE_OPEN)
+                       && (service->remoteport == port)) {
+                       lock_service(service);
+                       return service;
+               }
+       }
+       return NULL;
+}
+
+inline void
+request_poll(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service, int poll_type)
+{
+       uint32_t value;
+
+       if (service) {
+               do {
+                       value = atomic_read(&service->poll_flags);
+               } while (atomic_cmpxchg(&service->poll_flags, value,
+                       value | (1 << poll_type)) != value);
+
+               do {
+                       value = atomic_read(&state->poll_services[
+                               service->localport>>5]);
+               } while (atomic_cmpxchg(
+                       &state->poll_services[service->localport>>5],
+                       value, value | (1 << (service->localport & 0x1f)))
+                       != value);
+       }
+
+       state->poll_needed = 1;
+       wmb();
+
+       /* ... and ensure the slot handler runs. */
+       remote_event_signal_local(&state->local->trigger);
+}
+
+/* Called from queue_message, by the slot handler and application threads,
+** with slot_mutex held */
+static VCHIQ_HEADER_T *
+reserve_space(VCHIQ_STATE_T *state, int space, int is_blocking)
+{
+       VCHIQ_SHARED_STATE_T *local = state->local;
+       int tx_pos = state->local_tx_pos;
+       int slot_space = VCHIQ_SLOT_SIZE - (tx_pos & VCHIQ_SLOT_MASK);
+
+       if (space > slot_space) {
+               VCHIQ_HEADER_T *header;
+               /* Fill the remaining space with padding */
+               WARN_ON(state->tx_data == NULL);
+               header = (VCHIQ_HEADER_T *)
+                       (state->tx_data + (tx_pos & VCHIQ_SLOT_MASK));
+               header->msgid = VCHIQ_MSGID_PADDING;
+               header->size = slot_space - sizeof(VCHIQ_HEADER_T);
+
+               tx_pos += slot_space;
+       }
+
+       /* If necessary, get the next slot. */
+       if ((tx_pos & VCHIQ_SLOT_MASK) == 0) {
+               int slot_index;
+
+               /* If there is no free slot... */
+
+               if (down_trylock(&state->slot_available_event) != 0) {
+                       /* ...wait for one. */
+
+                       VCHIQ_STATS_INC(state, slot_stalls);
+
+                       /* But first, flush through the last slot. */
+                       state->local_tx_pos = tx_pos;
+                       local->tx_pos = tx_pos;
+                       remote_event_signal(&state->remote->trigger);
+
+                       if (!is_blocking ||
+                               (down_interruptible(
+                               &state->slot_available_event) != 0))
+                               return NULL; /* No space available */
+               }
+
+               BUG_ON(tx_pos ==
+                       (state->slot_queue_available * VCHIQ_SLOT_SIZE));
+
+               slot_index = local->slot_queue[
+                       SLOT_QUEUE_INDEX_FROM_POS(tx_pos) &
+                       VCHIQ_SLOT_QUEUE_MASK];
+               state->tx_data =
+                       (char *)SLOT_DATA_FROM_INDEX(state, slot_index);
+       }
+
+       state->local_tx_pos = tx_pos + space;
+
+       return (VCHIQ_HEADER_T *)(state->tx_data + (tx_pos & VCHIQ_SLOT_MASK));
+}
+
+/* Called by the recycle thread. */
+static void
+process_free_queue(VCHIQ_STATE_T *state)
+{
+       VCHIQ_SHARED_STATE_T *local = state->local;
+       BITSET_T service_found[BITSET_SIZE(VCHIQ_MAX_SERVICES)];
+       int slot_queue_available;
+
+       /* Use a read memory barrier to ensure that any state that may have
+       ** been modified by another thread is not masked by stale prefetched
+       ** values. */
+       rmb();
+
+       /* Find slots which have been freed by the other side, and return them
+       ** to the available queue. */
+       slot_queue_available = state->slot_queue_available;
+
+       while (slot_queue_available != local->slot_queue_recycle) {
+               unsigned int pos;
+               int slot_index = local->slot_queue[slot_queue_available++ &
+                       VCHIQ_SLOT_QUEUE_MASK];
+               char *data = (char *)SLOT_DATA_FROM_INDEX(state, slot_index);
+               int data_found = 0;
+
+               vchiq_log_trace(vchiq_core_log_level, "%d: pfq %d=%x %x %x",
+                       state->id, slot_index, (unsigned int)data,
+                       local->slot_queue_recycle, slot_queue_available);
+
+               /* Initialise the bitmask for services which have used this
+               ** slot */
+               BITSET_ZERO(service_found);
+
+               pos = 0;
+
+               while (pos < VCHIQ_SLOT_SIZE) {
+                       VCHIQ_HEADER_T *header =
+                               (VCHIQ_HEADER_T *)(data + pos);
+                       int msgid = header->msgid;
+                       if (VCHIQ_MSG_TYPE(msgid) == VCHIQ_MSG_DATA) {
+                               int port = VCHIQ_MSG_SRCPORT(msgid);
+                               VCHIQ_SERVICE_QUOTA_T *service_quota =
+                                       &state->service_quotas[port];
+                               int count;
+                               spin_lock(&quota_spinlock);
+                               count = service_quota->message_use_count;
+                               if (count > 0)
+                                       service_quota->message_use_count =
+                                               count - 1;
+                               spin_unlock(&quota_spinlock);
+
+                               if (count == service_quota->message_quota)
+                                       /* Signal the service that it
+                                       ** has dropped below its quota
+                                       */
+                                       up(&service_quota->quota_event);
+                               else if (count == 0) {
+                                       vchiq_log_error(vchiq_core_log_level,
+                                               "service %d "
+                                               "message_use_count=%d "
+                                               "(header %x, msgid %x, "
+                                               "header->msgid %x, "
+                                               "header->size %x)",
+                                               port,
+                                               service_quota->
+                                                       message_use_count,
+                                               (unsigned int)header, msgid,
+                                               header->msgid,
+                                               header->size);
+                                       WARN(1, "invalid message use count\n");
+                               }
+                               if (!BITSET_IS_SET(service_found, port)) {
+                                       /* Set the found bit for this service */
+                                       BITSET_SET(service_found, port);
+
+                                       spin_lock(&quota_spinlock);
+                                       count = service_quota->slot_use_count;
+                                       if (count > 0)
+                                               service_quota->slot_use_count =
+                                                       count - 1;
+                                       spin_unlock(&quota_spinlock);
+
+                                       if (count > 0) {
+                                               /* Signal the service in case
+                                               ** it has dropped below its
+                                               ** quota */
+                                               up(&service_quota->quota_event);
+                                               vchiq_log_trace(
+                                                       vchiq_core_log_level,
+                                                       "%d: pfq:%d %x@%x - "
+                                                       "slot_use->%d",
+                                                       state->id, port,
+                                                       header->size,
+                                                       (unsigned int)header,
+                                                       count - 1);
+                                       } else {
+                                               vchiq_log_error(
+                                                       vchiq_core_log_level,
+                                                               "service %d "
+                                                               "slot_use_count"
+                                                               "=%d (header %x"
+                                                               ", msgid %x, "
+                                                               "header->msgid"
+                                                               " %x, header->"
+                                                               "size %x)",
+                                                       port, count,
+                                                       (unsigned int)header,
+                                                       msgid,
+                                                       header->msgid,
+                                                       header->size);
+                                               WARN(1, "bad slot use count\n");
+                                       }
+                               }
+
+                               data_found = 1;
+                       }
+
+                       pos += calc_stride(header->size);
+                       if (pos > VCHIQ_SLOT_SIZE) {
+                               vchiq_log_error(vchiq_core_log_level,
+                                       "pfq - pos %x: header %x, msgid %x, "
+                                       "header->msgid %x, header->size %x",
+                                       pos, (unsigned int)header, msgid,
+                                       header->msgid, header->size);
+                               WARN(1, "invalid slot position\n");
+                       }
+               }
+
+               if (data_found) {
+                       int count;
+                       spin_lock(&quota_spinlock);
+                       count = state->data_use_count;
+                       if (count > 0)
+                               state->data_use_count =
+                                       count - 1;
+                       spin_unlock(&quota_spinlock);
+                       if (count == state->data_quota)
+                               up(&state->data_quota_event);
+               }
+
+               state->slot_queue_available = slot_queue_available;
+               up(&state->slot_available_event);
+       }
+}
+
+/* Called by the slot handler and application threads */
+static VCHIQ_STATUS_T
+queue_message(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service,
+       int msgid, const VCHIQ_ELEMENT_T *elements,
+       int count, int size, int is_blocking)
+{
+       VCHIQ_SHARED_STATE_T *local;
+       VCHIQ_SERVICE_QUOTA_T *service_quota = NULL;
+       VCHIQ_HEADER_T *header;
+       int type = VCHIQ_MSG_TYPE(msgid);
+
+       unsigned int stride;
+
+       local = state->local;
+
+       stride = calc_stride(size);
+
+       WARN_ON(!(stride <= VCHIQ_SLOT_SIZE));
+
+       if ((type != VCHIQ_MSG_RESUME) &&
+               (mutex_lock_interruptible(&state->slot_mutex) != 0))
+               return VCHIQ_RETRY;
+
+       if (type == VCHIQ_MSG_DATA) {
+               int tx_end_index;
+
+               BUG_ON(!service);
+
+               if (service->closing) {
+                       /* The service has been closed */
+                       mutex_unlock(&state->slot_mutex);
+                       return VCHIQ_ERROR;
+               }
+
+               service_quota = &state->service_quotas[service->localport];
+
+               spin_lock(&quota_spinlock);
+
+               /* Ensure this service doesn't use more than its quota of
+               ** messages or slots */
+               tx_end_index = SLOT_QUEUE_INDEX_FROM_POS(
+                       state->local_tx_pos + stride - 1);
+
+               /* Ensure data messages don't use more than their quota of
+               ** slots */
+               while ((tx_end_index != state->previous_data_index) &&
+                       (state->data_use_count == state->data_quota)) {
+                       VCHIQ_STATS_INC(state, data_stalls);
+                       spin_unlock(&quota_spinlock);
+                       mutex_unlock(&state->slot_mutex);
+
+                       if (down_interruptible(&state->data_quota_event)
+                               != 0)
+                               return VCHIQ_RETRY;
+
+                       mutex_lock(&state->slot_mutex);
+                       spin_lock(&quota_spinlock);
+                       tx_end_index = SLOT_QUEUE_INDEX_FROM_POS(
+                               state->local_tx_pos + stride - 1);
+                       if ((tx_end_index == state->previous_data_index) ||
+                               (state->data_use_count < state->data_quota)) {
+                               /* Pass the signal on to other waiters */
+                               up(&state->data_quota_event);
+                               break;
+                       }
+               }
+
+               while ((service_quota->message_use_count ==
+                               service_quota->message_quota) ||
+                       ((tx_end_index != service_quota->previous_tx_index) &&
+                       (service_quota->slot_use_count ==
+                               service_quota->slot_quota))) {
+                       spin_unlock(&quota_spinlock);
+                       vchiq_log_trace(vchiq_core_log_level,
+                               "%d: qm:%d %s,%x - quota stall "
+                               "(msg %d, slot %d)",
+                               state->id, service->localport,
+                               msg_type_str(type), size,
+                               service_quota->message_use_count,
+                               service_quota->slot_use_count);
+                       VCHIQ_SERVICE_STATS_INC(service, quota_stalls);
+                       mutex_unlock(&state->slot_mutex);
+                       if (down_interruptible(&service_quota->quota_event)
+                               != 0)
+                               return VCHIQ_RETRY;
+                       if (service->closing)
+                               return VCHIQ_ERROR;
+                       if (mutex_lock_interruptible(&state->slot_mutex) != 0)
+                               return VCHIQ_RETRY;
+                       if (service->srvstate != VCHIQ_SRVSTATE_OPEN) {
+                               /* The service has been closed */
+                               mutex_unlock(&state->slot_mutex);
+                               return VCHIQ_ERROR;
+                       }
+                       spin_lock(&quota_spinlock);
+                       tx_end_index = SLOT_QUEUE_INDEX_FROM_POS(
+                               state->local_tx_pos + stride - 1);
+               }
+
+               spin_unlock(&quota_spinlock);
+       }
+
+       header = reserve_space(state, stride, is_blocking);
+
+       if (!header) {
+               if (service)
+                       VCHIQ_SERVICE_STATS_INC(service, slot_stalls);
+               mutex_unlock(&state->slot_mutex);
+               return VCHIQ_RETRY;
+       }
+
+       if (type == VCHIQ_MSG_DATA) {
+               int i, pos;
+               int tx_end_index;
+               int slot_use_count;
+
+               vchiq_log_info(vchiq_core_log_level,
+                       "%d: qm %s@%x,%x (%d->%d)",
+                       state->id,
+                       msg_type_str(VCHIQ_MSG_TYPE(msgid)),
+                       (unsigned int)header, size,
+                       VCHIQ_MSG_SRCPORT(msgid),
+                       VCHIQ_MSG_DSTPORT(msgid));
+
+               BUG_ON(!service);
+
+               for (i = 0, pos = 0; i < (unsigned int)count;
+                       pos += elements[i++].size)
+                       if (elements[i].size) {
+                               if (vchiq_copy_from_user
+                                       (header->data + pos, elements[i].data,
+                                       (size_t) elements[i].size) !=
+                                       VCHIQ_SUCCESS) {
+                                       mutex_unlock(&state->slot_mutex);
+                                       VCHIQ_SERVICE_STATS_INC(service,
+                                               error_count);
+                                       return VCHIQ_ERROR;
+                               }
+                               if (i == 0) {
+                                       if (vchiq_core_msg_log_level >=
+                                               VCHIQ_LOG_INFO)
+                                               vchiq_log_dump_mem("Sent", 0,
+                                                       header->data + pos,
+                                                       min(64u,
+                                                       elements[0].size));
+                               }
+                       }
+
+               spin_lock(&quota_spinlock);
+               service_quota->message_use_count++;
+
+               tx_end_index =
+                       SLOT_QUEUE_INDEX_FROM_POS(state->local_tx_pos - 1);
+
+               /* If this transmission can't fit in the last slot used by any
+               ** service, the data_use_count must be increased. */
+               if (tx_end_index != state->previous_data_index) {
+                       state->previous_data_index = tx_end_index;
+                       state->data_use_count++;
+               }
+
+               /* If this isn't the same slot last used by this service,
+               ** the service's slot_use_count must be increased. */
+               if (tx_end_index != service_quota->previous_tx_index) {
+                       service_quota->previous_tx_index = tx_end_index;
+                       slot_use_count = ++service_quota->slot_use_count;
+               } else {
+                       slot_use_count = 0;
+               }
+
+               spin_unlock(&quota_spinlock);
+
+               if (slot_use_count)
+                       vchiq_log_trace(vchiq_core_log_level,
+                               "%d: qm:%d %s,%x - slot_use->%d (hdr %p)",
+                               state->id, service->localport,
+                               msg_type_str(VCHIQ_MSG_TYPE(msgid)), size,
+                               slot_use_count, header);
+
+               VCHIQ_SERVICE_STATS_INC(service, ctrl_tx_count);
+               VCHIQ_SERVICE_STATS_ADD(service, ctrl_tx_bytes, size);
+       } else {
+               vchiq_log_info(vchiq_core_log_level,
+                       "%d: qm %s@%x,%x (%d->%d)", state->id,
+                       msg_type_str(VCHIQ_MSG_TYPE(msgid)),
+                       (unsigned int)header, size,
+                       VCHIQ_MSG_SRCPORT(msgid),
+                       VCHIQ_MSG_DSTPORT(msgid));
+               if (size != 0) {
+                       WARN_ON(!((count == 1) && (size == elements[0].size)));
+                       memcpy(header->data, elements[0].data,
+                               elements[0].size);
+               }
+               VCHIQ_STATS_INC(state, ctrl_tx_count);
+       }
+
+       header->msgid = msgid;
+       header->size = size;
+
+       {
+               int svc_fourcc;
+
+               svc_fourcc = service
+                       ? service->base.fourcc
+                       : VCHIQ_MAKE_FOURCC('?', '?', '?', '?');
+
+               vchiq_log_info(vchiq_core_msg_log_level,
+                       "Sent Msg %s(%u) to %c%c%c%c s:%u d:%d len:%d",
+                       msg_type_str(VCHIQ_MSG_TYPE(msgid)),
+                       VCHIQ_MSG_TYPE(msgid),
+                       VCHIQ_FOURCC_AS_4CHARS(svc_fourcc),
+                       VCHIQ_MSG_SRCPORT(msgid),
+                       VCHIQ_MSG_DSTPORT(msgid),
+                       size);
+       }
+
+       /* Make sure the new header is visible to the peer. */
+       wmb();
+
+       /* Make the new tx_pos visible to the peer. */
+       local->tx_pos = state->local_tx_pos;
+       wmb();
+
+       if (service && (type == VCHIQ_MSG_CLOSE))
+               vchiq_set_service_state(service, VCHIQ_SRVSTATE_CLOSESENT);
+
+       if (VCHIQ_MSG_TYPE(msgid) != VCHIQ_MSG_PAUSE)
+               mutex_unlock(&state->slot_mutex);
+
+       remote_event_signal(&state->remote->trigger);
+
+       return VCHIQ_SUCCESS;
+}
+
+/* Called by the slot handler and application threads */
+static VCHIQ_STATUS_T
+queue_message_sync(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service,
+       int msgid, const VCHIQ_ELEMENT_T *elements,
+       int count, int size, int is_blocking)
+{
+       VCHIQ_SHARED_STATE_T *local;
+       VCHIQ_HEADER_T *header;
+
+       local = state->local;
+
+       if ((VCHIQ_MSG_TYPE(msgid) != VCHIQ_MSG_RESUME) &&
+               (mutex_lock_interruptible(&state->sync_mutex) != 0))
+               return VCHIQ_RETRY;
+
+       remote_event_wait(&local->sync_release);
+
+       rmb();
+
+       header = (VCHIQ_HEADER_T *)SLOT_DATA_FROM_INDEX(state,
+               local->slot_sync);
+
+       {
+               int oldmsgid = header->msgid;
+               if (oldmsgid != VCHIQ_MSGID_PADDING)
+                       vchiq_log_error(vchiq_core_log_level,
+                               "%d: qms - msgid %x, not PADDING",
+                               state->id, oldmsgid);
+       }
+
+       if (service) {
+               int i, pos;
+
+               vchiq_log_info(vchiq_sync_log_level,
+                       "%d: qms %s@%x,%x (%d->%d)", state->id,
+                       msg_type_str(VCHIQ_MSG_TYPE(msgid)),
+                       (unsigned int)header, size,
+                       VCHIQ_MSG_SRCPORT(msgid),
+                       VCHIQ_MSG_DSTPORT(msgid));
+
+               for (i = 0, pos = 0; i < (unsigned int)count;
+                       pos += elements[i++].size)
+                       if (elements[i].size) {
+                               if (vchiq_copy_from_user
+                                       (header->data + pos, elements[i].data,
+                                       (size_t) elements[i].size) !=
+                                       VCHIQ_SUCCESS) {
+                                       mutex_unlock(&state->sync_mutex);
+                                       VCHIQ_SERVICE_STATS_INC(service,
+                                               error_count);
+                                       return VCHIQ_ERROR;
+                               }
+                               if (i == 0) {
+                                       if (vchiq_sync_log_level >=
+                                               VCHIQ_LOG_TRACE)
+                                               vchiq_log_dump_mem("Sent Sync",
+                                                       0, header->data + pos,
+                                                       min(64u,
+                                                       elements[0].size));
+                               }
+                       }
+
+               VCHIQ_SERVICE_STATS_INC(service, ctrl_tx_count);
+               VCHIQ_SERVICE_STATS_ADD(service, ctrl_tx_bytes, size);
+       } else {
+               vchiq_log_info(vchiq_sync_log_level,
+                       "%d: qms %s@%x,%x (%d->%d)", state->id,
+                       msg_type_str(VCHIQ_MSG_TYPE(msgid)),
+                       (unsigned int)header, size,
+                       VCHIQ_MSG_SRCPORT(msgid),
+                       VCHIQ_MSG_DSTPORT(msgid));
+               if (size != 0) {
+                       WARN_ON(!((count == 1) && (size == elements[0].size)));
+                       memcpy(header->data, elements[0].data,
+                               elements[0].size);
+               }
+               VCHIQ_STATS_INC(state, ctrl_tx_count);
+       }
+
+       header->size = size;
+       header->msgid = msgid;
+
+       if (vchiq_sync_log_level >= VCHIQ_LOG_TRACE) {
+               int svc_fourcc;
+
+               svc_fourcc = service
+                       ? service->base.fourcc
+                       : VCHIQ_MAKE_FOURCC('?', '?', '?', '?');
+
+               vchiq_log_trace(vchiq_sync_log_level,
+                       "Sent Sync Msg %s(%u) to %c%c%c%c s:%u d:%d len:%d",
+                       msg_type_str(VCHIQ_MSG_TYPE(msgid)),
+                       VCHIQ_MSG_TYPE(msgid),
+                       VCHIQ_FOURCC_AS_4CHARS(svc_fourcc),
+                       VCHIQ_MSG_SRCPORT(msgid),
+                       VCHIQ_MSG_DSTPORT(msgid),
+                       size);
+       }
+
+       /* Make sure the new header is visible to the peer. */
+       wmb();
+
+       remote_event_signal(&state->remote->sync_trigger);
+
+       if (VCHIQ_MSG_TYPE(msgid) != VCHIQ_MSG_PAUSE)
+               mutex_unlock(&state->sync_mutex);
+
+       return VCHIQ_SUCCESS;
+}
+
+static inline void
+claim_slot(VCHIQ_SLOT_INFO_T *slot)
+{
+       slot->use_count++;
+}
+
+static void
+release_slot(VCHIQ_STATE_T *state, VCHIQ_SLOT_INFO_T *slot_info,
+       VCHIQ_HEADER_T *header, VCHIQ_SERVICE_T *service)
+{
+       int release_count;
+
+       mutex_lock(&state->recycle_mutex);
+
+       if (header) {
+               int msgid = header->msgid;
+               if (((msgid & VCHIQ_MSGID_CLAIMED) == 0) ||
+                       (service && service->closing)) {
+                       mutex_unlock(&state->recycle_mutex);
+                       return;
+               }
+
+               /* Rewrite the message header to prevent a double
+               ** release */
+               header->msgid = msgid & ~VCHIQ_MSGID_CLAIMED;
+       }
+
+       release_count = slot_info->release_count;
+       slot_info->release_count = ++release_count;
+
+       if (release_count == slot_info->use_count) {
+               int slot_queue_recycle;
+               /* Add to the freed queue */
+
+               /* A read barrier is necessary here to prevent speculative
+               ** fetches of remote->slot_queue_recycle from overtaking the
+               ** mutex. */
+               rmb();
+
+               slot_queue_recycle = state->remote->slot_queue_recycle;
+               state->remote->slot_queue[slot_queue_recycle &
+                       VCHIQ_SLOT_QUEUE_MASK] =
+                       SLOT_INDEX_FROM_INFO(state, slot_info);
+               state->remote->slot_queue_recycle = slot_queue_recycle + 1;
+               vchiq_log_info(vchiq_core_log_level,
+                       "%d: release_slot %d - recycle->%x",
+                       state->id, SLOT_INDEX_FROM_INFO(state, slot_info),
+                       state->remote->slot_queue_recycle);
+
+               /* A write barrier is necessary, but remote_event_signal
+               ** contains one. */
+               remote_event_signal(&state->remote->recycle);
+       }
+
+       mutex_unlock(&state->recycle_mutex);
+}
+
+/* Called by the slot handler - don't hold the bulk mutex */
+static VCHIQ_STATUS_T
+notify_bulks(VCHIQ_SERVICE_T *service, VCHIQ_BULK_QUEUE_T *queue,
+       int retry_poll)
+{
+       VCHIQ_STATUS_T status = VCHIQ_SUCCESS;
+
+       vchiq_log_trace(vchiq_core_log_level,
+               "%d: nb:%d %cx - p=%x rn=%x r=%x",
+               service->state->id, service->localport,
+               (queue == &service->bulk_tx) ? 't' : 'r',
+               queue->process, queue->remote_notify, queue->remove);
+
+       if (service->state->is_master) {
+               while (queue->remote_notify != queue->process) {
+                       VCHIQ_BULK_T *bulk =
+                               &queue->bulks[BULK_INDEX(queue->remote_notify)];
+                       int msgtype = (bulk->dir == VCHIQ_BULK_TRANSMIT) ?
+                               VCHIQ_MSG_BULK_RX_DONE : VCHIQ_MSG_BULK_TX_DONE;
+                       int msgid = VCHIQ_MAKE_MSG(msgtype, service->localport,
+                               service->remoteport);
+                       VCHIQ_ELEMENT_T element = { &bulk->actual, 4 };
+                       /* Only reply to non-dummy bulk requests */
+                       if (bulk->remote_data) {
+                               status = queue_message(service->state, NULL,
+                                       msgid, &element, 1, 4, 0);
+                               if (status != VCHIQ_SUCCESS)
+                                       break;
+                       }
+                       queue->remote_notify++;
+               }
+       } else {
+               queue->remote_notify = queue->process;
+       }
+
+       if (status == VCHIQ_SUCCESS) {
+               while (queue->remove != queue->remote_notify) {
+                       VCHIQ_BULK_T *bulk =
+                               &queue->bulks[BULK_INDEX(queue->remove)];
+
+                       /* Only generate callbacks for non-dummy bulk
+                       ** requests, and non-terminated services */
+                       if (bulk->data && service->instance) {
+                               if (bulk->actual != VCHIQ_BULK_ACTUAL_ABORTED) {
+                                       if (bulk->dir == VCHIQ_BULK_TRANSMIT) {
+                                               VCHIQ_SERVICE_STATS_INC(service,
+                                                       bulk_tx_count);
+                                               VCHIQ_SERVICE_STATS_ADD(service,
+                                                       bulk_tx_bytes,
+                                                       bulk->actual);
+                                       } else {
+                                               VCHIQ_SERVICE_STATS_INC(service,
+                                                       bulk_rx_count);
+                                               VCHIQ_SERVICE_STATS_ADD(service,
+                                                       bulk_rx_bytes,
+                                                       bulk->actual);
+                                       }
+                               } else {
+                                       VCHIQ_SERVICE_STATS_INC(service,
+                                               bulk_aborted_count);
+                               }
+                               if (bulk->mode == VCHIQ_BULK_MODE_BLOCKING) {
+                                       struct bulk_waiter *waiter;
+                                       spin_lock(&bulk_waiter_spinlock);
+                                       waiter = bulk->userdata;
+                                       if (waiter) {
+                                               waiter->actual = bulk->actual;
+                                               up(&waiter->event);
+                                       }
+                                       spin_unlock(&bulk_waiter_spinlock);
+                               } else if (bulk->mode ==
+                                       VCHIQ_BULK_MODE_CALLBACK) {
+                                       VCHIQ_REASON_T reason = (bulk->dir ==
+                                               VCHIQ_BULK_TRANSMIT) ?
+                                               ((bulk->actual ==
+                                               VCHIQ_BULK_ACTUAL_ABORTED) ?
+                                               VCHIQ_BULK_TRANSMIT_ABORTED :
+                                               VCHIQ_BULK_TRANSMIT_DONE) :
+                                               ((bulk->actual ==
+                                               VCHIQ_BULK_ACTUAL_ABORTED) ?
+                                               VCHIQ_BULK_RECEIVE_ABORTED :
+                                               VCHIQ_BULK_RECEIVE_DONE);
+                                       status = make_service_callback(service,
+                                               reason, NULL, bulk->userdata);
+                                       if (status == VCHIQ_RETRY)
+                                               break;
+                               }
+                       }
+
+                       queue->remove++;
+                       up(&service->bulk_remove_event);
+               }
+               if (!retry_poll)
+                       status = VCHIQ_SUCCESS;
+       }
+
+       if (status == VCHIQ_RETRY)
+               request_poll(service->state, service,
+                       (queue == &service->bulk_tx) ?
+                       VCHIQ_POLL_TXNOTIFY : VCHIQ_POLL_RXNOTIFY);
+
+       return status;
+}
+
+/* Called by the slot handler thread */
+static void
+poll_services(VCHIQ_STATE_T *state)
+{
+       int group, i;
+
+       for (group = 0; group < BITSET_SIZE(state->unused_service); group++) {
+               uint32_t flags;
+               flags = atomic_xchg(&state->poll_services[group], 0);
+               for (i = 0; flags; i++) {
+                       if (flags & (1 << i)) {
+                               VCHIQ_SERVICE_T *service =
+                                       find_service_by_port(state,
+                                               (group<<5) + i);
+                               uint32_t service_flags;
+                               flags &= ~(1 << i);
+                               if (!service)
+                                       continue;
+                               service_flags =
+                                       atomic_xchg(&service->poll_flags, 0);
+                               if (service_flags &
+                                       (1 << VCHIQ_POLL_REMOVE)) {
+                                       vchiq_log_info(vchiq_core_log_level,
+                                               "%d: ps - remove %d<->%d",
+                                               state->id, service->localport,
+                                               service->remoteport);
+
+                                       /* Make it look like a client, because
+                                          it must be removed and not left in
+                                          the LISTENING state. */
+                                       service->public_fourcc =
+                                               VCHIQ_FOURCC_INVALID;
+
+                                       if (vchiq_close_service_internal(
+                                               service, 0/*!close_recvd*/) !=
+                                               VCHIQ_SUCCESS)
+                                               request_poll(state, service,
+                                                       VCHIQ_POLL_REMOVE);
+                               } else if (service_flags &
+                                       (1 << VCHIQ_POLL_TERMINATE)) {
+                                       vchiq_log_info(vchiq_core_log_level,
+                                               "%d: ps - terminate %d<->%d",
+                                               state->id, service->localport,
+                                               service->remoteport);
+                                       if (vchiq_close_service_internal(
+                                               service, 0/*!close_recvd*/) !=
+                                               VCHIQ_SUCCESS)
+                                               request_poll(state, service,
+                                                       VCHIQ_POLL_TERMINATE);
+                               }
+                               if (service_flags & (1 << VCHIQ_POLL_TXNOTIFY))
+                                       notify_bulks(service,
+                                               &service->bulk_tx,
+                                               1/*retry_poll*/);
+                               if (service_flags & (1 << VCHIQ_POLL_RXNOTIFY))
+                                       notify_bulks(service,
+                                               &service->bulk_rx,
+                                               1/*retry_poll*/);
+                               unlock_service(service);
+                       }
+               }
+       }
+}
+
+/* Called by the slot handler or application threads, holding the bulk mutex. */
+static int
+resolve_bulks(VCHIQ_SERVICE_T *service, VCHIQ_BULK_QUEUE_T *queue)
+{
+       VCHIQ_STATE_T *state = service->state;
+       int resolved = 0;
+       int rc;
+
+       while ((queue->process != queue->local_insert) &&
+               (queue->process != queue->remote_insert)) {
+               VCHIQ_BULK_T *bulk = &queue->bulks[BULK_INDEX(queue->process)];
+
+               vchiq_log_trace(vchiq_core_log_level,
+                       "%d: rb:%d %cx - li=%x ri=%x p=%x",
+                       state->id, service->localport,
+                       (queue == &service->bulk_tx) ? 't' : 'r',
+                       queue->local_insert, queue->remote_insert,
+                       queue->process);
+
+               WARN_ON(!((int)(queue->local_insert - queue->process) > 0));
+               WARN_ON(!((int)(queue->remote_insert - queue->process) > 0));
+
+               rc = mutex_lock_interruptible(&state->bulk_transfer_mutex);
+               if (rc != 0)
+                       break;
+
+               vchiq_transfer_bulk(bulk);
+               mutex_unlock(&state->bulk_transfer_mutex);
+
+               if (vchiq_core_msg_log_level >= VCHIQ_LOG_INFO) {
+                       const char *header = (queue == &service->bulk_tx) ?
+                               "Send Bulk to" : "Recv Bulk from";
+                       if (bulk->actual != VCHIQ_BULK_ACTUAL_ABORTED)
+                               vchiq_log_info(vchiq_core_msg_log_level,
+                                       "%s %c%c%c%c d:%d len:%d %x<->%x",
+                                       header,
+                                       VCHIQ_FOURCC_AS_4CHARS(
+                                               service->base.fourcc),
+                                       service->remoteport,
+                                       bulk->size,
+                                       (unsigned int)bulk->data,
+                                       (unsigned int)bulk->remote_data);
+                       else
+                               vchiq_log_info(vchiq_core_msg_log_level,
+                                       "%s %c%c%c%c d:%d ABORTED - tx len:%d,"
+                                       " rx len:%d %x<->%x",
+                                       header,
+                                       VCHIQ_FOURCC_AS_4CHARS(
+                                               service->base.fourcc),
+                                       service->remoteport,
+                                       bulk->size,
+                                       bulk->remote_size,
+                                       (unsigned int)bulk->data,
+                                       (unsigned int)bulk->remote_data);
+               }
+
+               vchiq_complete_bulk(bulk);
+               queue->process++;
+               resolved++;
+       }
+       return resolved;
+}
+
+/* Called with the bulk_mutex held */
+static void
+abort_outstanding_bulks(VCHIQ_SERVICE_T *service, VCHIQ_BULK_QUEUE_T *queue)
+{
+       int is_tx = (queue == &service->bulk_tx);
+       vchiq_log_trace(vchiq_core_log_level,
+               "%d: aob:%d %cx - li=%x ri=%x p=%x",
+               service->state->id, service->localport, is_tx ? 't' : 'r',
+               queue->local_insert, queue->remote_insert, queue->process);
+
+       WARN_ON(!((int)(queue->local_insert - queue->process) >= 0));
+       WARN_ON(!((int)(queue->remote_insert - queue->process) >= 0));
+
+       while ((queue->process != queue->local_insert) ||
+               (queue->process != queue->remote_insert)) {
+               VCHIQ_BULK_T *bulk = &queue->bulks[BULK_INDEX(queue->process)];
+
+               if (queue->process == queue->remote_insert) {
+                       /* fabricate a matching dummy bulk */
+                       bulk->remote_data = NULL;
+                       bulk->remote_size = 0;
+                       queue->remote_insert++;
+               }
+
+               if (queue->process != queue->local_insert) {
+                       vchiq_complete_bulk(bulk);
+
+                       vchiq_log_info(vchiq_core_msg_log_level,
+                               "%s %c%c%c%c d:%d ABORTED - tx len:%d, "
+                               "rx len:%d",
+                               is_tx ? "Send Bulk to" : "Recv Bulk from",
+                               VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc),
+                               service->remoteport,
+                               bulk->size,
+                               bulk->remote_size);
+               } else {
+                       /* fabricate a matching dummy bulk */
+                       bulk->data = NULL;
+                       bulk->size = 0;
+                       bulk->actual = VCHIQ_BULK_ACTUAL_ABORTED;
+                       bulk->dir = is_tx ? VCHIQ_BULK_TRANSMIT :
+                               VCHIQ_BULK_RECEIVE;
+                       queue->local_insert++;
+               }
+
+               queue->process++;
+       }
+}
+
+/* Called from the slot handler thread */
+static void
+pause_bulks(VCHIQ_STATE_T *state)
+{
+       if (unlikely(atomic_inc_return(&pause_bulks_count) != 1)) {
+               WARN_ON_ONCE(1);
+               atomic_set(&pause_bulks_count, 1);
+               return;
+       }
+
+       /* Block bulk transfers from all services */
+       mutex_lock(&state->bulk_transfer_mutex);
+}
+
+/* Called from the slot handler thread */
+static void
+resume_bulks(VCHIQ_STATE_T *state)
+{
+       int i;
+       if (unlikely(atomic_dec_return(&pause_bulks_count) != 0)) {
+               WARN_ON_ONCE(1);
+               atomic_set(&pause_bulks_count, 0);
+               return;
+       }
+
+       /* Allow bulk transfers from all services */
+       mutex_unlock(&state->bulk_transfer_mutex);
+
+       if (state->deferred_bulks == 0)
+               return;
+
+       /* Deal with any bulks which had to be deferred due to being in
+        * paused state.  Don't try to match up to number of deferred bulks
+        * in case we've had something come and close the service in the
+        * interim - just process all bulk queues for all services */
+       vchiq_log_info(vchiq_core_log_level, "%s: processing %d deferred bulks",
+               __func__, state->deferred_bulks);
+
+       for (i = 0; i < state->unused_service; i++) {
+               VCHIQ_SERVICE_T *service = state->services[i];
+               int resolved_rx = 0;
+               int resolved_tx = 0;
+               if (!service || (service->srvstate != VCHIQ_SRVSTATE_OPEN))
+                       continue;
+
+               mutex_lock(&service->bulk_mutex);
+               resolved_rx = resolve_bulks(service, &service->bulk_rx);
+               resolved_tx = resolve_bulks(service, &service->bulk_tx);
+               mutex_unlock(&service->bulk_mutex);
+               if (resolved_rx)
+                       notify_bulks(service, &service->bulk_rx, 1);
+               if (resolved_tx)
+                       notify_bulks(service, &service->bulk_tx, 1);
+       }
+       state->deferred_bulks = 0;
+}
+
+static int
+parse_open(VCHIQ_STATE_T *state, VCHIQ_HEADER_T *header)
+{
+       VCHIQ_SERVICE_T *service = NULL;
+       int msgid, size;
+       int type;
+       unsigned int localport, remoteport;
+
+       msgid = header->msgid;
+       size = header->size;
+       type = VCHIQ_MSG_TYPE(msgid);
+       localport = VCHIQ_MSG_DSTPORT(msgid);
+       remoteport = VCHIQ_MSG_SRCPORT(msgid);
+       if (size >= sizeof(struct vchiq_open_payload)) {
+               const struct vchiq_open_payload *payload =
+                       (struct vchiq_open_payload *)header->data;
+               unsigned int fourcc;
+
+               fourcc = payload->fourcc;
+               vchiq_log_info(vchiq_core_log_level,
+                       "%d: prs OPEN@%x (%d->'%c%c%c%c')",
+                       state->id, (unsigned int)header,
+                       localport,
+                       VCHIQ_FOURCC_AS_4CHARS(fourcc));
+
+               service = get_listening_service(state, fourcc);
+
+               if (service) {
+                       /* A matching service exists */
+                       short version = payload->version;
+                       short version_min = payload->version_min;
+                       if ((service->version < version_min) ||
+                               (version < service->version_min)) {
+                               /* Version mismatch */
+                               vchiq_loud_error_header();
+                               vchiq_loud_error("%d: service %d (%c%c%c%c) "
+                                       "version mismatch - local (%d, min %d)"
+                                       " vs. remote (%d, min %d)",
+                                       state->id, service->localport,
+                                       VCHIQ_FOURCC_AS_4CHARS(fourcc),
+                                       service->version, service->version_min,
+                                       version, version_min);
+                               vchiq_loud_error_footer();
+                               unlock_service(service);
+                               service = NULL;
+                               goto fail_open;
+                       }
+                       service->peer_version = version;
+
+                       if (service->srvstate == VCHIQ_SRVSTATE_LISTENING) {
+                               struct vchiq_openack_payload ack_payload = {
+                                       service->version
+                               };
+                               VCHIQ_ELEMENT_T body = {
+                                       &ack_payload,
+                                       sizeof(ack_payload)
+                               };
+
+                               /* Acknowledge the OPEN */
+                               if (service->sync) {
+                                       if (queue_message_sync(state, NULL,
+                                               VCHIQ_MAKE_MSG(
+                                                       VCHIQ_MSG_OPENACK,
+                                                       service->localport,
+                                                       remoteport),
+                                               &body, 1, sizeof(ack_payload),
+                                               0) == VCHIQ_RETRY)
+                                               goto bail_not_ready;
+                               } else {
+                                       if (queue_message(state, NULL,
+                                               VCHIQ_MAKE_MSG(
+                                                       VCHIQ_MSG_OPENACK,
+                                                       service->localport,
+                                                       remoteport),
+                                               &body, 1, sizeof(ack_payload),
+                                               0) == VCHIQ_RETRY)
+                                               goto bail_not_ready;
+                               }
+
+                               /* The service is now open */
+                               vchiq_set_service_state(service,
+                                       service->sync ? VCHIQ_SRVSTATE_OPENSYNC
+                                       : VCHIQ_SRVSTATE_OPEN);
+                       }
+
+                       service->remoteport = remoteport;
+                       service->client_id = ((int *)header->data)[1];
+                       if (make_service_callback(service, VCHIQ_SERVICE_OPENED,
+                               NULL, NULL) == VCHIQ_RETRY) {
+                               /* Bail out if not ready */
+                               service->remoteport = VCHIQ_PORT_FREE;
+                               goto bail_not_ready;
+                       }
+
+                       /* Success - the message has been dealt with */
+                       unlock_service(service);
+                       return 1;
+               }
+       }
+
+fail_open:
+       /* No available service, or an invalid request - send a CLOSE */
+       if (queue_message(state, NULL,
+               VCHIQ_MAKE_MSG(VCHIQ_MSG_CLOSE, 0, VCHIQ_MSG_SRCPORT(msgid)),
+               NULL, 0, 0, 0) == VCHIQ_RETRY)
+               goto bail_not_ready;
+
+       return 1;
+
+bail_not_ready:
+       if (service)
+               unlock_service(service);
+
+       return 0;
+}
+
+/* Called by the slot handler thread */
+static void
+parse_rx_slots(VCHIQ_STATE_T *state)
+{
+       VCHIQ_SHARED_STATE_T *remote = state->remote;
+       VCHIQ_SERVICE_T *service = NULL;
+       int tx_pos;
+       DEBUG_INITIALISE(state->local)
+
+       tx_pos = remote->tx_pos;
+
+       while (state->rx_pos != tx_pos) {
+               VCHIQ_HEADER_T *header;
+               int msgid, size;
+               int type;
+               unsigned int localport, remoteport;
+
+               DEBUG_TRACE(PARSE_LINE);
+               if (!state->rx_data) {
+                       int rx_index;
+                       WARN_ON(!((state->rx_pos & VCHIQ_SLOT_MASK) == 0));
+                       rx_index = remote->slot_queue[
+                               SLOT_QUEUE_INDEX_FROM_POS(state->rx_pos) &
+                               VCHIQ_SLOT_QUEUE_MASK];
+                       state->rx_data = (char *)SLOT_DATA_FROM_INDEX(state,
+                               rx_index);
+                       state->rx_info = SLOT_INFO_FROM_INDEX(state, rx_index);
+
+                       /* Initialise use_count to one, and increment
+                       ** release_count at the end of the slot to avoid
+                       ** releasing the slot prematurely. */
+                       state->rx_info->use_count = 1;
+                       state->rx_info->release_count = 0;
+               }
+
+               header = (VCHIQ_HEADER_T *)(state->rx_data +
+                       (state->rx_pos & VCHIQ_SLOT_MASK));
+               DEBUG_VALUE(PARSE_HEADER, (int)header);
+               msgid = header->msgid;
+               DEBUG_VALUE(PARSE_MSGID, msgid);
+               size = header->size;
+               type = VCHIQ_MSG_TYPE(msgid);
+               localport = VCHIQ_MSG_DSTPORT(msgid);
+               remoteport = VCHIQ_MSG_SRCPORT(msgid);
+
+               if (type != VCHIQ_MSG_DATA)
+                       VCHIQ_STATS_INC(state, ctrl_rx_count);
+
+               switch (type) {
+               case VCHIQ_MSG_OPENACK:
+               case VCHIQ_MSG_CLOSE:
+               case VCHIQ_MSG_DATA:
+               case VCHIQ_MSG_BULK_RX:
+               case VCHIQ_MSG_BULK_TX:
+               case VCHIQ_MSG_BULK_RX_DONE:
+               case VCHIQ_MSG_BULK_TX_DONE:
+                       service = find_service_by_port(state, localport);
+                       if ((!service || service->remoteport != remoteport) &&
+                               (localport == 0) &&
+                               (type == VCHIQ_MSG_CLOSE)) {
+                               /* This could be a CLOSE from a client which
+                                  hadn't yet received the OPENACK - look for
+                                  the connected service */
+                               if (service)
+                                       unlock_service(service);
+                               service = get_connected_service(state,
+                                       remoteport);
+                               if (service)
+                                       vchiq_log_warning(vchiq_core_log_level,
+                                               "%d: prs %s@%x (%d->%d) - "
+                                               "found connected service %d",
+                                               state->id, msg_type_str(type),
+                                               (unsigned int)header,
+                                               remoteport, localport,
+                                               service->localport);
+                       }
+
+                       if (!service) {
+                               vchiq_log_error(vchiq_core_log_level,
+                                       "%d: prs %s@%x (%d->%d) - "
+                                       "invalid/closed service %d",
+                                       state->id, msg_type_str(type),
+                                       (unsigned int)header,
+                                       remoteport, localport, localport);
+                               goto skip_message;
+                       }
+                       break;
+               default:
+                       break;
+               }
+
+               if (vchiq_core_msg_log_level >= VCHIQ_LOG_INFO) {
+                       int svc_fourcc;
+
+                       svc_fourcc = service
+                               ? service->base.fourcc
+                               : VCHIQ_MAKE_FOURCC('?', '?', '?', '?');
+                       vchiq_log_info(vchiq_core_msg_log_level,
+                               "Rcvd Msg %s(%u) from %c%c%c%c s:%d d:%d "
+                               "len:%d",
+                               msg_type_str(type), type,
+                               VCHIQ_FOURCC_AS_4CHARS(svc_fourcc),
+                               remoteport, localport, size);
+                       if (size > 0)
+                               vchiq_log_dump_mem("Rcvd", 0, header->data,
+                                       min(64, size));
+               }
+
+               if (((unsigned int)header & VCHIQ_SLOT_MASK) + calc_stride(size)
+                       > VCHIQ_SLOT_SIZE) {
+                       vchiq_log_error(vchiq_core_log_level,
+                               "header %x (msgid %x) - size %x too big for "
+                               "slot",
+                               (unsigned int)header, (unsigned int)msgid,
+                               (unsigned int)size);
+                       WARN(1, "oversized for slot\n");
+               }
+
+               switch (type) {
+               case VCHIQ_MSG_OPEN:
+                       WARN_ON(!(VCHIQ_MSG_DSTPORT(msgid) == 0));
+                       if (!parse_open(state, header))
+                               goto bail_not_ready;
+                       break;
+               case VCHIQ_MSG_OPENACK:
+                       if (size >= sizeof(struct vchiq_openack_payload)) {
+                               const struct vchiq_openack_payload *payload =
+                                       (struct vchiq_openack_payload *)
+                                       header->data;
+                               service->peer_version = payload->version;
+                       }
+                       vchiq_log_info(vchiq_core_log_level,
+                               "%d: prs OPENACK@%x,%x (%d->%d) v:%d",
+                               state->id, (unsigned int)header, size,
+                               remoteport, localport, service->peer_version);
+                       if (service->srvstate ==
+                               VCHIQ_SRVSTATE_OPENING) {
+                               service->remoteport = remoteport;
+                               vchiq_set_service_state(service,
+                                       VCHIQ_SRVSTATE_OPEN);
+                               up(&service->remove_event);
+                       } else
+                               vchiq_log_error(vchiq_core_log_level,
+                                       "OPENACK received in state %s",
+                                       srvstate_names[service->srvstate]);
+                       break;
+               case VCHIQ_MSG_CLOSE:
+                       WARN_ON(size != 0); /* There should be no data */
+
+                       vchiq_log_info(vchiq_core_log_level,
+                               "%d: prs CLOSE@%x (%d->%d)",
+                               state->id, (unsigned int)header,
+                               remoteport, localport);
+
+                       mark_service_closing_internal(service, 1);
+
+                       if (vchiq_close_service_internal(service,
+                               1/*close_recvd*/) == VCHIQ_RETRY)
+                               goto bail_not_ready;
+
+                       vchiq_log_info(vchiq_core_log_level,
+                               "Close Service %c%c%c%c s:%u d:%d",
+                               VCHIQ_FOURCC_AS_4CHARS(service->base.fourcc),
+                               service->localport,
+                               service->remoteport);
+                       break;
+               case VCHIQ_MSG_DATA:
+                       vchiq_log_trace(vchiq_core_log_level,
+                               "%d: prs DATA@%x,%x (%d->%d)",
+                               state->id, (unsigned int)header, size,
+                               remoteport, localport);
+
+                       if ((service->remoteport == remoteport)
+                               && (service->srvstate ==
+                               VCHIQ_SRVSTATE_OPEN)) {
+                               header->msgid = msgid | VCHIQ_MSGID_CLAIMED;
+                               claim_slot(state->rx_info);
+                               DEBUG_TRACE(PARSE_LINE);
+                               if (make_service_callback(service,
+                                       VCHIQ_MESSAGE_AVAILABLE, header,
+                                       NULL) == VCHIQ_RETRY) {
+                                       DEBUG_TRACE(PARSE_LINE);
+                                       goto bail_not_ready;
+                               }
+                               VCHIQ_SERVICE_STATS_INC(service, ctrl_rx_count);
+                               VCHIQ_SERVICE_STATS_ADD(service, ctrl_rx_bytes,
+                                       size);
+                       } else {
+                               VCHIQ_STATS_INC(state, error_count);
+                       }
+                       break;
+               case VCHIQ_MSG_CONNECT:
+                       vchiq_log_info(vchiq_core_log_level,
+                               "%d: prs CONNECT@%x",
+                               state->id, (unsigned int)header);
+                       up(&state->connect);
+                       break;
+               case VCHIQ_MSG_BULK_RX:
+               case VCHIQ_MSG_BULK_TX: {
+                       VCHIQ_BULK_QUEUE_T *queue;
+                       WARN_ON(!state->is_master);
+                       queue = (type == VCHIQ_MSG_BULK_RX) ?
+                               &service->bulk_tx : &service->bulk_rx;
+                       if ((service->remoteport == remoteport)
+                               && (service->srvstate ==
+                               VCHIQ_SRVSTATE_OPEN)) {
+                               VCHIQ_BULK_T *bulk;
+                               int resolved = 0;
+
+                               DEBUG_TRACE(PARSE_LINE);
+                               if (mutex_lock_interruptible(
+                                       &service->bulk_mutex) != 0) {
+                                       DEBUG_TRACE(PARSE_LINE);
+                                       goto bail_not_ready;
+                               }
+
+                               WARN_ON(!(queue->remote_insert < queue->remove +
+                                       VCHIQ_NUM_SERVICE_BULKS));
+                               bulk = &queue->bulks[
+                                       BULK_INDEX(queue->remote_insert)];
+                               bulk->remote_data =
+                                       (void *)((int *)header->data)[0];
+                               bulk->remote_size = ((int *)header->data)[1];
+                               wmb();
+
+                               vchiq_log_info(vchiq_core_log_level,
+                                       "%d: prs %s@%x (%d->%d) %x@%x",
+                                       state->id, msg_type_str(type),
+                                       (unsigned int)header,
+                                       remoteport, localport,
+                                       bulk->remote_size,
+                                       (unsigned int)bulk->remote_data);
+
+                               queue->remote_insert++;
+
+                               if (atomic_read(&pause_bulks_count)) {
+                                       state->deferred_bulks++;
+                                       vchiq_log_info(vchiq_core_log_level,
+                                               "%s: deferring bulk (%d)",
+                                               __func__,
+                                               state->deferred_bulks);
+                                       if (state->conn_state !=
+                                               VCHIQ_CONNSTATE_PAUSE_SENT)
+                                               vchiq_log_error(
+                                                       vchiq_core_log_level,
+                                                       "%s: bulks paused in "
+                                                       "unexpected state %s",
+                                                       __func__,
+                                                       conn_state_names[
+                                                       state->conn_state]);
+                               } else if (state->conn_state ==
+                                       VCHIQ_CONNSTATE_CONNECTED) {
+                                       DEBUG_TRACE(PARSE_LINE);
+                                       resolved = resolve_bulks(service,
+                                               queue);
+                               }
+
+                               mutex_unlock(&service->bulk_mutex);
+                               if (resolved)
+                                       notify_bulks(service, queue,
+                                               1/*retry_poll*/);
+                       }
+               } break;
+               case VCHIQ_MSG_BULK_RX_DONE:
+               case VCHIQ_MSG_BULK_TX_DONE:
+                       WARN_ON(state->is_master);
+                       if ((service->remoteport == remoteport)
+                               && (service->srvstate !=
+                               VCHIQ_SRVSTATE_FREE)) {
+                               VCHIQ_BULK_QUEUE_T *queue;
+                               VCHIQ_BULK_T *bulk;
+
+                               queue = (type == VCHIQ_MSG_BULK_RX_DONE) ?
+                                       &service->bulk_rx : &service->bulk_tx;
+
+                               DEBUG_TRACE(PARSE_LINE);
+                               if (mutex_lock_interruptible(
+                                       &service->bulk_mutex) != 0) {
+                                       DEBUG_TRACE(PARSE_LINE);
+                                       goto bail_not_ready;
+                               }
+                               if ((int)(queue->remote_insert -
+                                       queue->local_insert) >= 0) {
+                                       vchiq_log_error(vchiq_core_log_level,
+                                               "%d: prs %s@%x (%d->%d) "
+                                               "unexpected (ri=%d,li=%d)",
+                                               state->id, msg_type_str(type),
+                                               (unsigned int)header,
+                                               remoteport, localport,
+                                               queue->remote_insert,
+                                               queue->local_insert);
+                                       mutex_unlock(&service->bulk_mutex);
+                                       break;
+                               }
+
+                               BUG_ON(queue->process == queue->local_insert);
+                               BUG_ON(queue->process != queue->remote_insert);
+
+                               bulk = &queue->bulks[
+                                       BULK_INDEX(queue->remote_insert)];
+                               bulk->actual = *(int *)header->data;
+                               queue->remote_insert++;
+
+                               vchiq_log_info(vchiq_core_log_level,
+                                       "%d: prs %s@%x (%d->%d) %x@%x",
+                                       state->id, msg_type_str(type),
+                                       (unsigned int)header,
+                                       remoteport, localport,
+                                       bulk->actual, (unsigned int)bulk->data);
+
+                               vchiq_log_trace(vchiq_core_log_level,
+                                       "%d: prs:%d %cx li=%x ri=%x p=%x",
+                                       state->id, localport,
+                                       (type == VCHIQ_MSG_BULK_RX_DONE) ?
+                                               'r' : 't',
+                                       queue->local_insert,
+                                       queue->remote_insert, queue->process);
+
+                               DEBUG_TRACE(PARSE_LINE);
+                               WARN_ON(queue->process == queue->local_insert);
+                               vchiq_complete_bulk(bulk);
+                               queue->process++;
+                               mutex_unlock(&service->bulk_mutex);
+                               DEBUG_TRACE(PARSE_LINE);
+                               notify_bulks(service, queue, 1/*retry_poll*/);
+                               DEBUG_TRACE(PARSE_LINE);
+                       }
+                       break;
+               case VCHIQ_MSG_PADDING:
+                       vchiq_log_trace(vchiq_core_log_level,
+                               "%d: prs PADDING@%x,%x",
+                               state->id, (unsigned int)header, size);
+                       break;
+               case VCHIQ_MSG_PAUSE:
+                       /* If initiated, signal the application thread */
+                       vchiq_log_trace(vchiq_core_log_level,
+                               "%d: prs PAUSE@%x,%x",
+                               state->id, (unsigned int)header, size);
+                       if (state->conn_state == VCHIQ_CONNSTATE_PAUSED) {
+                               vchiq_log_error(vchiq_core_log_level,
+                                       "%d: PAUSE received in state PAUSED",
+                                       state->id);
+                               break;
+                       }
+                       if (state->conn_state != VCHIQ_CONNSTATE_PAUSE_SENT) {
+                               /* Send a PAUSE in response */
+                               if (queue_message(state, NULL,
+                                       VCHIQ_MAKE_MSG(VCHIQ_MSG_PAUSE, 0, 0),
+                                       NULL, 0, 0, 0) == VCHIQ_RETRY)
+                                       goto bail_not_ready;
+                               if (state->is_master)
+                                       pause_bulks(state);
+                       }
+                       /* At this point slot_mutex is held */
+                       vchiq_set_conn_state(state, VCHIQ_CONNSTATE_PAUSED);
+                       vchiq_platform_paused(state);
+                       break;
+               case VCHIQ_MSG_RESUME:
+                       vchiq_log_trace(vchiq_core_log_level,
+                               "%d: prs RESUME@%x,%x",
+                               state->id, (unsigned int)header, size);
+                       /* Release the slot mutex */
+                       mutex_unlock(&state->slot_mutex);
+                       if (state->is_master)
+                               resume_bulks(state);
+                       vchiq_set_conn_state(state, VCHIQ_CONNSTATE_CONNECTED);
+                       vchiq_platform_resumed(state);
+                       break;
+
+               case VCHIQ_MSG_REMOTE_USE:
+                       vchiq_on_remote_use(state);
+                       break;
+               case VCHIQ_MSG_REMOTE_RELEASE:
+                       vchiq_on_remote_release(state);
+                       break;
+               case VCHIQ_MSG_REMOTE_USE_ACTIVE:
+                       vchiq_on_remote_use_active(state);
+                       break;
+
+               default:
+                       vchiq_log_error(vchiq_core_log_level,
+                               "%d: prs invalid msgid %x@%x,%x",
+                               state->id, msgid, (unsigned int)header, size);
+                       WARN(1, "invalid message\n");
+                       break;
+               }
+
+skip_message:
+               if (service) {
+                       unlock_service(service);
+                       service = NULL;
+               }
+
+               state->rx_pos += calc_stride(size);
+
+               DEBUG_TRACE(PARSE_LINE);
+               /* Perform some housekeeping when the end of the slot is
+               ** reached. */
+               if ((state->rx_pos & VCHIQ_SLOT_MASK) == 0) {
+                       /* Remove the extra reference count. */
+                       release_slot(state, state->rx_info, NULL, NULL);
+                       state->rx_data = NULL;
+               }
+       }
+
+bail_not_ready:
+       if (service)
+               unlock_service(service);
+}
+
+/* Called by the slot handler thread */
+static int
+slot_handler_func(void *v)
+{
+       VCHIQ_STATE_T *state = (VCHIQ_STATE_T *) v;
+       VCHIQ_SHARED_STATE_T *local = state->local;
+       DEBUG_INITIALISE(local)
+
+       while (1) {
+               DEBUG_COUNT(SLOT_HANDLER_COUNT);
+               DEBUG_TRACE(SLOT_HANDLER_LINE);
+               remote_event_wait(&local->trigger);
+
+               rmb();
+
+               DEBUG_TRACE(SLOT_HANDLER_LINE);
+               if (state->poll_needed) {
+                       /* Check if we need to suspend - may change our
+                        * conn_state */
+                       vchiq_platform_check_suspend(state);
+
+                       state->poll_needed = 0;
+
+                       /* Handle service polling and other rare conditions here
+                       ** out of the mainline code */
+                       switch (state->conn_state) {
+                       case VCHIQ_CONNSTATE_CONNECTED:
+                               /* Poll the services as requested */
+                               poll_services(state);
+                               break;
+
+                       case VCHIQ_CONNSTATE_PAUSING:
+                               if (state->is_master)
+                                       pause_bulks(state);
+                               if (queue_message(state, NULL,
+                                       VCHIQ_MAKE_MSG(VCHIQ_MSG_PAUSE, 0, 0),
+                                       NULL, 0, 0, 0) != VCHIQ_RETRY) {
+                                       vchiq_set_conn_state(state,
+                                               VCHIQ_CONNSTATE_PAUSE_SENT);
+                               } else {
+                                       if (state->is_master)
+                                               resume_bulks(state);
+                                       /* Retry later */
+                                       state->poll_needed = 1;
+                               }
+                               break;
+
+                       case VCHIQ_CONNSTATE_PAUSED:
+                               vchiq_platform_resume(state);
+                               break;
+
+                       case VCHIQ_CONNSTATE_RESUMING:
+                               if (queue_message(state, NULL,
+                                       VCHIQ_MAKE_MSG(VCHIQ_MSG_RESUME, 0, 0),
+                                       NULL, 0, 0, 0) != VCHIQ_RETRY) {
+                                       if (state->is_master)
+                                               resume_bulks(state);
+                                       vchiq_set_conn_state(state,
+                                               VCHIQ_CONNSTATE_CONNECTED);
+                                       vchiq_platform_resumed(state);
+                               } else {
+                                       /* This should really be impossible,
+                                       ** since the PAUSE should have flushed
+                                       ** through outstanding messages. */
+                                       vchiq_log_error(vchiq_core_log_level,
+                                               "Failed to send RESUME "
+                                               "message");
+                                       BUG();
+                               }
+                               break;
+
+                       case VCHIQ_CONNSTATE_PAUSE_TIMEOUT:
+                       case VCHIQ_CONNSTATE_RESUME_TIMEOUT:
+                               vchiq_platform_handle_timeout(state);
+                               break;
+                       default:
+                               break;
+                       }
+
+
+               }
+
+               DEBUG_TRACE(SLOT_HANDLER_LINE);
+               parse_rx_slots(state);
+       }
+       return 0;
+}
+
+
+/* Called by the recycle thread */
+static int
+recycle_func(void *v)
+{
+       VCHIQ_STATE_T *state = (VCHIQ_STATE_T *) v;
+       VCHIQ_SHARED_STATE_T *local = state->local;
+
+       while (1) {
+               remote_event_wait(&local->recycle);
+
+               process_free_queue(state);
+       }
+       return 0;
+}
+
+
+/* Called by the sync thread */
+static int
+sync_func(void *v)
+{
+       VCHIQ_STATE_T *state = (VCHIQ_STATE_T *) v;
+       VCHIQ_SHARED_STATE_T *local = state->local;
+       VCHIQ_HEADER_T *header = (VCHIQ_HEADER_T *)SLOT_DATA_FROM_INDEX(state,
+               state->remote->slot_sync);
+
+       while (1) {
+               VCHIQ_SERVICE_T *service;
+               int msgid, size;
+               int type;
+               unsigned int localport, remoteport;
+
+               remote_event_wait(&local->sync_trigger);
+
+               rmb();
+
+               msgid = header->msgid;
+               size = header->size;
+               type = VCHIQ_MSG_TYPE(msgid);
+               localport = VCHIQ_MSG_DSTPORT(msgid);
+               remoteport = VCHIQ_MSG_SRCPORT(msgid);
+
+               service = find_service_by_port(state, localport);
+
+               if (!service) {
+                       vchiq_log_error(vchiq_sync_log_level,
+                               "%d: sf %s@%x (%d->%d) - "
+                               "invalid/closed service %d",
+                               state->id, msg_type_str(type),
+                               (unsigned int)header,
+                               remoteport, localport, localport);
+                       release_message_sync(state, header);
+                       continue;
+               }
+
+               if (vchiq_sync_log_level >= VCHIQ_LOG_TRACE) {
+                       int svc_fourcc;
+
+                       svc_fourcc = service
+                               ? service->base.fourcc
+                               : VCHIQ_MAKE_FOURCC('?', '?', '?', '?');
+                       vchiq_log_trace(vchiq_sync_log_level,
+                               "Rcvd Msg %s from %c%c%c%c s:%d d:%d len:%d",
+                               msg_type_str(type),
+                               VCHIQ_FOURCC_AS_4CHARS(svc_fourcc),
+                               remoteport, localport, size);
+                       if (size > 0)
+                               vchiq_log_dump_mem("Rcvd", 0, header->data,
+                                       min(64, size));
+               }
+
+               switch (type) {
+               case VCHIQ_MSG_OPENACK:
+                       if (size >= sizeof(struct vchiq_openack_payload)) {
+                               const struct vchiq_openack_payload *payload =
+                                       (struct vchiq_openack_payload *)
+                                       header->data;
+                               service->peer_version = payload->version;
+                       }
+                       vchiq_log_info(vchiq_sync_log_level,
+                               "%d: sf OPENACK@%x,%x (%d->%d) v:%d",
+                               state->id, (unsigned int)header, size,
+                               remoteport, localport, service->peer_version);
+                       if (service->srvstate == VCHIQ_SRVSTATE_OPENING) {
+                               service->remoteport = remoteport;
+                               vchiq_set_service_state(service,
+                                       VCHIQ_SRVSTATE_OPENSYNC);
+                               up(&service->remove_event);
+                       }
+                       release_message_sync(state, header);
+                       break;
+
+               case VCHIQ_MSG_DATA:
+                       vchiq_log_trace(vchiq_sync_log_level,
+                               "%d: sf DATA@%x,%x (%d->%d)",
+                               state->id, (unsigned int)header, size,
+                               remoteport, localport);
+
+                       if ((service->remoteport == remoteport) &&
+                               (service->srvstate ==
+                               VCHIQ_SRVSTATE_OPENSYNC)) {
+                               if (make_service_callback(service,
+                                       VCHIQ_MESSAGE_AVAILABLE, header,
+                                       NULL) == VCHIQ_RETRY)
+                                       vchiq_log_error(vchiq_sync_log_level,
+                                               "synchronous callback to "
+                                               "service %d returns "
+                                               "VCHIQ_RETRY",
+                                               localport);
+                       }
+                       break;
+
+               default:
+                       vchiq_log_error(vchiq_sync_log_level,
+                               "%d: sf unexpected msgid %x@%x,%x",
+                               state->id, msgid, (unsigned int)header, size);
+                       release_message_sync(state, header);
+                       break;
+               }
+
+               unlock_service(service);
+       }
+
+       return 0;
+}
+
+
+static void
+init_bulk_queue(VCHIQ_BULK_QUEUE_T *queue)
+{
+       queue->local_insert = 0;
+       queue->remote_insert = 0;
+       queue->process = 0;
+       queue->remote_notify = 0;
+       queue->remove = 0;
+}
+
+
+inline const char *
+get_conn_state_name(VCHIQ_CONNSTATE_T conn_state)
+{
+       return conn_state_names[conn_state];
+}
+
+
+VCHIQ_SLOT_ZERO_T *
+vchiq_init_slots(void *mem_base, int mem_size)
+{
+       int mem_align = (VCHIQ_SLOT_SIZE - (int)mem_base) & VCHIQ_SLOT_MASK;
+       VCHIQ_SLOT_ZERO_T *slot_zero =
+               (VCHIQ_SLOT_ZERO_T *)((char *)mem_base + mem_align);
+       int num_slots = (mem_size - mem_align)/VCHIQ_SLOT_SIZE;
+       int first_data_slot = VCHIQ_SLOT_ZERO_SLOTS;
+
+       /* Ensure there is enough memory to run an absolutely minimum system */
+       num_slots -= first_data_slot;
+
+       if (num_slots < 4) {
+               vchiq_log_error(vchiq_core_log_level,
+                       "vchiq_init_slots - insufficient memory %x bytes",
+                       mem_size);
+               return NULL;
+       }
+
+       memset(slot_zero, 0, sizeof(VCHIQ_SLOT_ZERO_T));
+
+       slot_zero->magic = VCHIQ_MAGIC;
+       slot_zero->version = VCHIQ_VERSION;
+       slot_zero->version_min = VCHIQ_VERSION_MIN;
+       slot_zero->slot_zero_size = sizeof(VCHIQ_SLOT_ZERO_T);
+       slot_zero->slot_size = VCHIQ_SLOT_SIZE;
+       slot_zero->max_slots = VCHIQ_MAX_SLOTS;
+       slot_zero->max_slots_per_side = VCHIQ_MAX_SLOTS_PER_SIDE;
+
+       slot_zero->master.slot_sync = first_data_slot;
+       slot_zero->master.slot_first = first_data_slot + 1;
+       slot_zero->master.slot_last = first_data_slot + (num_slots/2) - 1;
+       slot_zero->slave.slot_sync = first_data_slot + (num_slots/2);
+       slot_zero->slave.slot_first = first_data_slot + (num_slots/2) + 1;
+       slot_zero->slave.slot_last = first_data_slot + num_slots - 1;
+
+       return slot_zero;
+}
+
+VCHIQ_STATUS_T
+vchiq_init_state(VCHIQ_STATE_T *state, VCHIQ_SLOT_ZERO_T *slot_zero,
+                int is_master)
+{
+       VCHIQ_SHARED_STATE_T *local;
+       VCHIQ_SHARED_STATE_T *remote;
+       VCHIQ_STATUS_T status;
+       char threadname[10];
+       static int id;
+       int i;
+
+       vchiq_log_warning(vchiq_core_log_level,
+               "%s: slot_zero = 0x%08lx, is_master = %d",
+               __func__, (unsigned long)slot_zero, is_master);
+
+       /* Check the input configuration */
+
+       if (slot_zero->magic != VCHIQ_MAGIC) {
+               vchiq_loud_error_header();
+               vchiq_loud_error("Invalid VCHIQ magic value found.");
+               vchiq_loud_error("slot_zero=%x: magic=%x (expected %x)",
+                       (unsigned int)slot_zero, slot_zero->magic, VCHIQ_MAGIC);
+               vchiq_loud_error_footer();
+               return VCHIQ_ERROR;
+       }
+
+       if (slot_zero->version < VCHIQ_VERSION_MIN) {
+               vchiq_loud_error_header();
+               vchiq_loud_error("Incompatible VCHIQ versions found.");
+               vchiq_loud_error("slot_zero=%x: VideoCore version=%d "
+                       "(minimum %d)",
+                       (unsigned int)slot_zero, slot_zero->version,
+                       VCHIQ_VERSION_MIN);
+               vchiq_loud_error("Restart with a newer VideoCore image.");
+               vchiq_loud_error_footer();
+               return VCHIQ_ERROR;
+       }
+
+       if (VCHIQ_VERSION < slot_zero->version_min) {
+               vchiq_loud_error_header();
+               vchiq_loud_error("Incompatible VCHIQ versions found.");
+               vchiq_loud_error("slot_zero=%x: version=%d (VideoCore "
+                       "minimum %d)",
+                       (unsigned int)slot_zero, VCHIQ_VERSION,
+                       slot_zero->version_min);
+               vchiq_loud_error("Restart with a newer kernel.");
+               vchiq_loud_error_footer();
+               return VCHIQ_ERROR;
+       }
+
+       if ((slot_zero->slot_zero_size != sizeof(VCHIQ_SLOT_ZERO_T)) ||
+                (slot_zero->slot_size != VCHIQ_SLOT_SIZE) ||
+                (slot_zero->max_slots != VCHIQ_MAX_SLOTS) ||
+                (slot_zero->max_slots_per_side != VCHIQ_MAX_SLOTS_PER_SIDE)) {
+               vchiq_loud_error_header();
+               if (slot_zero->slot_zero_size != sizeof(VCHIQ_SLOT_ZERO_T))
+                       vchiq_loud_error("slot_zero=%x: slot_zero_size=%x "
+                               "(expected %x)",
+                               (unsigned int)slot_zero,
+                               slot_zero->slot_zero_size,
+                               sizeof(VCHIQ_SLOT_ZERO_T));
+               if (slot_zero->slot_size != VCHIQ_SLOT_SIZE)
+                       vchiq_loud_error("slot_zero=%x: slot_size=%d "
+                               "(expected %d",
+                               (unsigned int)slot_zero, slot_zero->slot_size,
+                               VCHIQ_SLOT_SIZE);
+               if (slot_zero->max_slots != VCHIQ_MAX_SLOTS)
+                       vchiq_loud_error("slot_zero=%x: max_slots=%d "
+                               "(expected %d)",
+                               (unsigned int)slot_zero, slot_zero->max_slots,
+                               VCHIQ_MAX_SLOTS);
+               if (slot_zero->max_slots_per_side != VCHIQ_MAX_SLOTS_PER_SIDE)
+                       vchiq_loud_error("slot_zero=%x: max_slots_per_side=%d "
+                               "(expected %d)",
+                               (unsigned int)slot_zero,
+                               slot_zero->max_slots_per_side,
+                               VCHIQ_MAX_SLOTS_PER_SIDE);
+               vchiq_loud_error_footer();
+               return VCHIQ_ERROR;
+       }
+
+       if (is_master) {
+               local = &slot_zero->master;
+               remote = &slot_zero->slave;
+       } else {
+               local = &slot_zero->slave;
+               remote = &slot_zero->master;
+       }
+
+       if (local->initialised) {
+               vchiq_loud_error_header();
+               if (remote->initialised)
+                       vchiq_loud_error("local state has already been "
+                               "initialised");
+               else
+                       vchiq_loud_error("master/slave mismatch - two %ss",
+                               is_master ? "master" : "slave");
+               vchiq_loud_error_footer();
+               return VCHIQ_ERROR;
+       }
+
+       memset(state, 0, sizeof(VCHIQ_STATE_T));
+
+       state->id = id++;
+       state->is_master = is_master;
+
+       /*
+               initialize shared state pointers
+        */
+
+       state->local = local;
+       state->remote = remote;
+       state->slot_data = (VCHIQ_SLOT_T *)slot_zero;
+
+       /*
+               initialize events and mutexes
+        */
+
+       sema_init(&state->connect, 0);
+       mutex_init(&state->mutex);
+       sema_init(&state->trigger_event, 0);
+       sema_init(&state->recycle_event, 0);
+       sema_init(&state->sync_trigger_event, 0);
+       sema_init(&state->sync_release_event, 0);
+
+       mutex_init(&state->slot_mutex);
+       mutex_init(&state->recycle_mutex);
+       mutex_init(&state->sync_mutex);
+       mutex_init(&state->bulk_transfer_mutex);
+
+       sema_init(&state->slot_available_event, 0);
+       sema_init(&state->slot_remove_event, 0);
+       sema_init(&state->data_quota_event, 0);
+
+       state->slot_queue_available = 0;
+
+       for (i = 0; i < VCHIQ_MAX_SERVICES; i++) {
+               VCHIQ_SERVICE_QUOTA_T *service_quota =
+                       &state->service_quotas[i];
+               sema_init(&service_quota->quota_event, 0);
+       }
+
+       for (i = local->slot_first; i <= local->slot_last; i++) {
+               local->slot_queue[state->slot_queue_available++] = i;
+               up(&state->slot_available_event);
+       }
+
+       state->default_slot_quota = state->slot_queue_available/2;
+       state->default_message_quota =
+               min((unsigned short)(state->default_slot_quota * 256),
+               (unsigned short)~0);
+
+       state->previous_data_index = -1;
+       state->data_use_count = 0;
+       state->data_quota = state->slot_queue_available - 1;
+
+       local->trigger.event = &state->trigger_event;
+       remote_event_create(&local->trigger);
+       local->tx_pos = 0;
+
+       local->recycle.event = &state->recycle_event;
+       remote_event_create(&local->recycle);
+       local->slot_queue_recycle = state->slot_queue_available;
+
+       local->sync_trigger.event = &state->sync_trigger_event;
+       remote_event_create(&local->sync_trigger);
+
+       local->sync_release.event = &state->sync_release_event;
+       remote_event_create(&local->sync_release);
+
+       /* At start-of-day, the slot is empty and available */
+       ((VCHIQ_HEADER_T *)SLOT_DATA_FROM_INDEX(state, local->slot_sync))->msgid
+               = VCHIQ_MSGID_PADDING;
+       remote_event_signal_local(&local->sync_release);
+
+       local->debug[DEBUG_ENTRIES] = DEBUG_MAX;
+
+       status = vchiq_platform_init_state(state);
+
+       /*
+               bring up slot handler thread
+        */
+       snprintf(threadname, sizeof(threadname), "VCHIQ-%d", state->id);
+       state->slot_handler_thread = kthread_create(&slot_handler_func,
+               (void *)state,
+               threadname);
+
+       if (state->slot_handler_thread == NULL) {
+               vchiq_loud_error_header();
+               vchiq_loud_error("couldn't create thread %s", threadname);
+               vchiq_loud_error_footer();
+               return VCHIQ_ERROR;
+       }
+       set_user_nice(state->slot_handler_thread, -19);
+       wake_up_process(state->slot_handler_thread);
+
+       snprintf(threadname, sizeof(threadname), "VCHIQr-%d", state->id);
+       state->recycle_thread = kthread_create(&recycle_func,
+               (void *)state,
+               threadname);
+       if (state->recycle_thread == NULL) {
+               vchiq_loud_error_header();
+               vchiq_loud_error("couldn't create thread %s", threadname);
+               vchiq_loud_error_footer();
+               return VCHIQ_ERROR;
+       }
+       set_user_nice(state->recycle_thread, -19);
+       wake_up_process(state->recycle_thread);
+
+       snprintf(threadname, sizeof(threadname), "VCHIQs-%d", state->id);
+       state->sync_thread = kthread_create(&sync_func,
+               (void *)state,
+               threadname);
+       if (state->sync_thread == NULL) {
+               vchiq_loud_error_header();
+               vchiq_loud_error("couldn't create thread %s", threadname);
+               vchiq_loud_error_footer();
+               return VCHIQ_ERROR;
+       }
+       set_user_nice(state->sync_thread, -20);
+       wake_up_process(state->sync_thread);
+
+       BUG_ON(state->id >= VCHIQ_MAX_STATES);
+       vchiq_states[state->id] = state;
+
+       /* Indicate readiness to the other side */
+       local->initialised = 1;
+
+       return status;
+}
+
+/* Called from application thread when a client or server service is created. */
+VCHIQ_SERVICE_T *
+vchiq_add_service_internal(VCHIQ_STATE_T *state,
+       const VCHIQ_SERVICE_PARAMS_T *params, int srvstate,
+       VCHIQ_INSTANCE_T instance, VCHIQ_USERDATA_TERM_T userdata_term)
+{
+       VCHIQ_SERVICE_T *service;
+
+       service = kmalloc(sizeof(VCHIQ_SERVICE_T), GFP_KERNEL);
+       if (service) {
+               service->base.fourcc   = params->fourcc;
+               service->base.callback = params->callback;
+               service->base.userdata = params->userdata;
+               service->handle        = VCHIQ_SERVICE_HANDLE_INVALID;
+               service->ref_count     = 1;
+               service->srvstate      = VCHIQ_SRVSTATE_FREE;
+               service->userdata_term = userdata_term;
+               service->localport     = VCHIQ_PORT_FREE;
+               service->remoteport    = VCHIQ_PORT_FREE;
+
+               service->public_fourcc = (srvstate == VCHIQ_SRVSTATE_OPENING) ?
+                       VCHIQ_FOURCC_INVALID : params->fourcc;
+               service->client_id     = 0;
+               service->auto_close    = 1;
+               service->sync          = 0;
+               service->closing       = 0;
+               atomic_set(&service->poll_flags, 0);
+               service->version       = params->version;
+               service->version_min   = params->version_min;
+               service->state         = state;
+               service->instance      = instance;
+               service->service_use_count = 0;
+               init_bulk_queue(&service->bulk_tx);
+               init_bulk_queue(&service->bulk_rx);
+               sema_init(&service->remove_event, 0);
+               sema_init(&service->bulk_remove_event, 0);
+               mutex_init(&service->bulk_mutex);
+               memset(&service->stats, 0, sizeof(service->stats));
+       } else {
+               vchiq_log_error(vchiq_core_log_level,
+                       "Out of memory");
+       }
+
+       if (service) {
+               VCHIQ_SERVICE_T **pservice = NULL;
+               int i;
+
+               /* Although it is perfectly possible to use service_spinlock
+               ** to protect the creation of services, it is overkill as it
+               ** disables interrupts while the array is searched.
+               ** The only danger is of another thread trying to create a
+               ** service - service deletion is safe.
+               ** Therefore it is preferable to use state->mutex which,
+               ** although slower to claim, doesn't block interrupts while
+               ** it is held.
+               */
+
+               mutex_lock(&state->mutex);
+
+               /* Prepare to use a previously unused service */
+               if (state->unused_service < VCHIQ_MAX_SERVICES)
+                       pservice = &state->services[state->unused_service];
+
+               if (srvstate == VCHIQ_SRVSTATE_OPENING) {
+                       for (i = 0; i < state->unused_service; i++) {
+                               VCHIQ_SERVICE_T *srv = state->services[i];
+                               if (!srv) {
+                                       pservice = &state->services[i];
+                                       break;
+                               }
+                       }
+               } else {
+                       for (i = (state->unused_service - 1); i >= 0; i--) {
+                               VCHIQ_SERVICE_T *srv = state->services[i];
+                               if (!srv)
+                                       pservice = &state->services[i];
+                               else if ((srv->public_fourcc == params->fourcc)
+                                       && ((srv->instance != instance) ||
+                                       (srv->base.callback !=
+                                       params->callback))) {
+                                       /* There is another server using this
+                                       ** fourcc which doesn't match. */
+                                       pservice = NULL;
+                                       break;
+                               }
+                       }
+               }
+
+               if (pservice) {
+                       service->localport = (pservice - state->services);
+                       if (!handle_seq)
+                               handle_seq = VCHIQ_MAX_STATES *
+                                        VCHIQ_MAX_SERVICES;
+                       service->handle = handle_seq |
+                               (state->id * VCHIQ_MAX_SERVICES) |
+                               service->localport;
+                       handle_seq += VCHIQ_MAX_STATES * VCHIQ_MAX_SERVICES;
+                       *pservice = service;
+                       if (pservice == &state->services[state->unused_service])
+                               state->unused_service++;
+               }
+
+               mutex_unlock(&state->mutex);
+
+               if (!pservice) {
+                       kfree(service);
+                       service = NULL;
+               }
+       }
+
+       if (service) {
+               VCHIQ_SERVICE_QUOTA_T *service_quota =
+                       &state->service_quotas[service->localport];
+               service_quota->slot_quota = state->default_slot_quota;
+               service_quota->message_quota = state->default_message_quota;
+               if (service_quota->slot_use_count == 0)
+                       service_quota->previous_tx_index =
+                               SLOT_QUEUE_INDEX_FROM_POS(state->local_tx_pos)
+                               - 1;
+
+               /* Bring this service online */
+               vchiq_set_service_state(service, srvstate);
+
+               vchiq_log_info(vchiq_core_msg_log_level,
+                       "%s Service %c%c%c%c SrcPort:%d",
+                       (srvstate == VCHIQ_SRVSTATE_OPENING)
+                       ? "Open" : "Add",
+                       VCHIQ_FOURCC_AS_4CHARS(params->fourcc),
+                       service->localport);
+       }
+
+       /* Don't unlock the service - leave it with a ref_count of 1. */
+
+       return service;
+}
+
+VCHIQ_STATUS_T
+vchiq_open_service_internal(VCHIQ_SERVICE_T *service, int client_id)
+{
+       struct vchiq_open_payload payload = {
+               service->base.fourcc,
+               client_id,
+               service->version,
+               service->version_min
+       };
+       VCHIQ_ELEMENT_T body = { &payload, sizeof(payload) };
+       VCHIQ_STATUS_T status = VCHIQ_SUCCESS;
+
+       service->client_id = client_id;
+       vchiq_use_service_internal(service);
+       status = queue_message(service->state, NULL,
+               VCHIQ_MAKE_MSG(VCHIQ_MSG_OPEN, service->localport, 0),
+               &body, 1, sizeof(payload), 1);
+       if (status == VCHIQ_SUCCESS) {
+               if (down_interruptible(&service->remove_event) != 0) {
+                       status = VCHIQ_RETRY;
+                       vchiq_release_service_internal(service);
+               } else if ((service->srvstate != VCHIQ_SRVSTATE_OPEN) &&
+                       (service->srvstate != VCHIQ_SRVSTATE_OPENSYNC)) {
+                       if (service->srvstate != VCHIQ_SRVSTATE_CLOSEWAIT)
+                               vchiq_log_error(vchiq_core_log_level,
+                                       "%d: osi - srvstate = %s (ref %d)",
+                                       service->state->id,
+                                       srvstate_names[service->srvstate],
+                                       service->ref_count);
+                       status = VCHIQ_ERROR;
+                       VCHIQ_SERVICE_STATS_INC(service, error_count);
+                       vchiq_release_service_internal(service);
+               }
+       }
+       return status;
+}
+
+static void
+release_service_messages(VCHIQ_SERVICE_T *service)
+{
+       VCHIQ_STATE_T *state = service->state;
+       int slot_last = state->remote->slot_last;
+       int i;
+
+       /* Release any claimed messages */
+       for (i = state->remote->slot_first; i <= slot_last; i++) {
+               VCHIQ_SLOT_INFO_T *slot_info =
+                       SLOT_INFO_FROM_INDEX(state, i);
+               if (slot_info->release_count != slot_info->use_count) {
+                       char *data =
+                               (char *)SLOT_DATA_FROM_INDEX(state, i);
+                       unsigned int pos, end;
+
+                       end = VCHIQ_SLOT_SIZE;
+                       if (data == state->rx_data)
+                               /* This buffer is still being read from - stop
+                               ** at the current read position */
+                               end = state->rx_pos & VCHIQ_SLOT_MASK;
+
+                       pos = 0;
+
+                       while (pos < end) {
+                               VCHIQ_HEADER_T *header =
+                                       (VCHIQ_HEADER_T *)(data + pos);
+                               int msgid = header->msgid;
+                               int port = VCHIQ_MSG_DSTPORT(msgid);
+                               if ((port == service->localport) &&
+                                       (msgid & VCHIQ_MSGID_CLAIMED)) {
+                                       vchiq_log_info(vchiq_core_log_level,
+                                               "  fsi - hdr %x",
+                                               (unsigned int)header);
+                                       release_slot(state, slot_info, header,
+                                               NULL);
+                               }
+                               pos += calc_stride(header->size);
+                               if (pos > VCHIQ_SLOT_SIZE) {
+                                       vchiq_log_error(vchiq_core_log_level,
+                                               "fsi - pos %x: header %x, "
+                                               "msgid %x, header->msgid %x, "
+                                               "header->size %x",
+                                               pos, (unsigned int)header,
+                                               msgid, header->msgid,
+                                               header->size);
+                                       WARN(1, "invalid slot position\n");
+                               }
+                       }
+               }
+       }
+}
+
+static int
+do_abort_bulks(VCHIQ_SERVICE_T *service)
+{
+       VCHIQ_STATUS_T status;
+
+       /* Abort any outstanding bulk transfers */
+       if (mutex_lock_interruptible(&service->bulk_mutex) != 0)
+               return 0;
+       abort_outstanding_bulks(service, &service->bulk_tx);
+       abort_outstanding_bulks(service, &service->bulk_rx);
+       mutex_unlock(&service->bulk_mutex);
+
+       status = notify_bulks(service, &service->bulk_tx, 0/*!retry_poll*/);
+       if (status == VCHIQ_SUCCESS)
+               status = notify_bulks(service, &service->bulk_rx,
+                       0/*!retry_poll*/);
+       return (status == VCHIQ_SUCCESS);
+}
+
+static VCHIQ_STATUS_T
+close_service_complete(VCHIQ_SERVICE_T *service, int failstate)
+{
+       VCHIQ_STATUS_T status;
+       int is_server = (service->public_fourcc != VCHIQ_FOURCC_INVALID);
+       int newstate;
+
+       switch (service->srvstate) {
+       case VCHIQ_SRVSTATE_OPEN:
+       case VCHIQ_SRVSTATE_CLOSESENT:
+       case VCHIQ_SRVSTATE_CLOSERECVD:
+               if (is_server) {
+                       if (service->auto_close) {
+                               service->client_id = 0;
+                               service->remoteport = VCHIQ_PORT_FREE;
+                               newstate = VCHIQ_SRVSTATE_LISTENING;
+                       } else
+                               newstate = VCHIQ_SRVSTATE_CLOSEWAIT;
+               } else
+                       newstate = VCHIQ_SRVSTATE_CLOSED;
+               vchiq_set_service_state(service, newstate);
+               break;
+       case VCHIQ_SRVSTATE_LISTENING:
+               break;
+       default:
+               vchiq_log_error(vchiq_core_log_level,
+                       "close_service_complete(%x) called in state %s",
+                       service->handle, srvstate_names[service->srvstate]);
+               WARN(1, "close_service_complete in unexpected state\n");
+               return VCHIQ_ERROR;
+       }
+
+       status = make_service_callback(service,
+               VCHIQ_SERVICE_CLOSED, NULL, NULL);
+
+       if (status != VCHIQ_RETRY) {
+               int uc = service->service_use_count;
+               int i;
+               /* Complete the close process */
+               for (i = 0; i < uc; i++)
+                       /* cater for cases where close is forced and the
+                       ** client may not close all it's handles */
+                       vchiq_release_service_internal(service);
+
+               service->client_id = 0;
+               service->remoteport = VCHIQ_PORT_FREE;
+
+               if (service->srvstate == VCHIQ_SRVSTATE_CLOSED)
+                       vchiq_free_service_internal(service);
+               else if (service->srvstate != VCHIQ_SRVSTATE_CLOSEWAIT) {
+                       if (is_server)
+                               service->closing = 0;
+
+                       up(&service->remove_event);
+               }
+       } else
+               vchiq_set_service_state(service, failstate);
+
+       return status;
+}
+
+/* Called by the slot handler */
+VCHIQ_STATUS_T
+vchiq_close_service_internal(VCHIQ_SERVICE_T *service, int close_recvd)
+{
+       VCHIQ_STATE_T *state = service->state;
+       VCHIQ_STATUS_T status = VCHIQ_SUCCESS;
+       int is_server = (service->public_fourcc != VCHIQ_FOURCC_INVALID);
+
+       vchiq_log_info(vchiq_core_log_level, "%d: csi:%d,%d (%s)",
+               service->state->id, service->localport, close_recvd,
+               srvstate_names[service->srvstate]);
+
+       switch (service->srvstate) {
+       case VCHIQ_SRVSTATE_CLOSED:
+       case VCHIQ_SRVSTATE_HIDDEN:
+       case VCHIQ_SRVSTATE_LISTENING:
+       case VCHIQ_SRVSTATE_CLOSEWAIT:
+               if (close_recvd)
+                       vchiq_log_error(vchiq_core_log_level,
+                               "vchiq_close_service_internal(1) called "
+                               "in state %s",
+                               srvstate_names[service->srvstate]);
+               else if (is_server) {
+                       if (service->srvstate == VCHIQ_SRVSTATE_LISTENING) {
+                               status = VCHIQ_ERROR;
+                       } else {
+                               service->client_id = 0;
+                               service->remoteport = VCHIQ_PORT_FREE;
+                               if (service->srvstate ==
+                                       VCHIQ_SRVSTATE_CLOSEWAIT)
+                                       vchiq_set_service_state(service,
+                                               VCHIQ_SRVSTATE_LISTENING);
+                       }
+                       up(&service->remove_event);
+               } else
+                       vchiq_free_service_internal(service);
+               break;
+       case VCHIQ_SRVSTATE_OPENING:
+               if (close_recvd) {
+                       /* The open was rejected - tell the user */
+                       vchiq_set_service_state(service,
+                               VCHIQ_SRVSTATE_CLOSEWAIT);
+                       up(&service->remove_event);
+               } else {
+                       /* Shutdown mid-open - let the other side know */
+                       status = queue_message(state, service,
+                               VCHIQ_MAKE_MSG
+                               (VCHIQ_MSG_CLOSE,
+                               service->localport,
+                               VCHIQ_MSG_DSTPORT(service->remoteport)),
+                               NULL, 0, 0, 0);
+               }
+               break;
+
+       case VCHIQ_SRVSTATE_OPENSYNC:
+               mutex_lock(&state->sync_mutex);
+               /* Drop through */
+
+       case VCHIQ_SRVSTATE_OPEN:
+               if (state->is_master || close_recvd) {
+                       if (!do_abort_bulks(service))
+                               status = VCHIQ_RETRY;
+               }
+
+               release_service_messages(service);
+
+               if (status == VCHIQ_SUCCESS)
+                       status = queue_message(state, service,
+                               VCHIQ_MAKE_MSG
+                               (VCHIQ_MSG_CLOSE,
+                               service->localport,
+                               VCHIQ_MSG_DSTPORT(service->remoteport)),
+                               NULL, 0, 0, 0);
+
+               if (status == VCHIQ_SUCCESS) {
+                       if (!close_recvd)
+                               break;
+               } else if (service->srvstate == VCHIQ_SRVSTATE_OPENSYNC) {
+                       mutex_unlock(&state->sync_mutex);
+                       break;
+               } else
+                       break;
+
+               status = close_service_complete(service,
+                               VCHIQ_SRVSTATE_CLOSERECVD);
+               break;
+
+       case VCHIQ_SRVSTATE_CLOSESENT:
+               if (!close_recvd)
+                       /* This happens when a process is killed mid-close */
+                       break;
+
+               if (!state->is_master) {
+                       if (!do_abort_bulks(service)) {
+                               status = VCHIQ_RETRY;
+                               break;
+                       }
+               }
+
+               if (status == VCHIQ_SUCCESS)
+                       status = close_service_complete(service,
+                               VCHIQ_SRVSTATE_CLOSERECVD);
+               break;
+
+       case VCHIQ_SRVSTATE_CLOSERECVD:
+               if (!close_recvd && is_server)
+                       /* Force into LISTENING mode */
+                       vchiq_set_service_state(service,
+                               VCHIQ_SRVSTATE_LISTENING);
+               status = close_service_complete(service,
+                       VCHIQ_SRVSTATE_CLOSERECVD);
+               break;
+
+       default:
+               vchiq_log_error(vchiq_core_log_level,
+                       "vchiq_close_service_internal(%d) called in state %s",
+                       close_recvd, srvstate_names[service->srvstate]);
+               break;
+       }
+
+       return status;
+}
+
+/* Called from the application process upon process death */
+void
+vchiq_terminate_service_internal(VCHIQ_SERVICE_T *service)
+{
+       VCHIQ_STATE_T *state = service->state;
+
+       vchiq_log_info(vchiq_core_log_level, "%d: tsi - (%d<->%d)",
+               state->id, service->localport, service->remoteport);
+
+       mark_service_closing(service);
+
+       /* Mark the service for removal by the slot handler */
+       request_poll(state, service, VCHIQ_POLL_REMOVE);
+}
+
+/* Called from the slot handler */
+void
+vchiq_free_service_internal(VCHIQ_SERVICE_T *service)
+{
+       VCHIQ_STATE_T *state = service->state;
+
+       vchiq_log_info(vchiq_core_log_level, "%d: fsi - (%d)",
+               state->id, service->localport);
+
+       switch (service->srvstate) {
+       case VCHIQ_SRVSTATE_OPENING:
+       case VCHIQ_SRVSTATE_CLOSED:
+       case VCHIQ_SRVSTATE_HIDDEN:
+       case VCHIQ_SRVSTATE_LISTENING:
+       case VCHIQ_SRVSTATE_CLOSEWAIT:
+               break;
+       default:
+               vchiq_log_error(vchiq_core_log_level,
+                       "%d: fsi - (%d) in state %s",
+                       state->id, service->localport,
+                       srvstate_names[service->srvstate]);
+               return;
+       }
+
+       vchiq_set_service_state(service, VCHIQ_SRVSTATE_FREE);
+
+       up(&service->remove_event);
+
+       /* Release the initial lock */
+       unlock_service(service);
+}
+
+VCHIQ_STATUS_T
+vchiq_connect_internal(VCHIQ_STATE_T *state, VCHIQ_INSTANCE_T instance)
+{
+       VCHIQ_SERVICE_T *service;
+       int i;
+
+       /* Find all services registered to this client and enable them. */
+       i = 0;
+       while ((service = next_service_by_instance(state, instance,
+               &i)) != NULL) {
+               if (service->srvstate == VCHIQ_SRVSTATE_HIDDEN)
+                       vchiq_set_service_state(service,
+                               VCHIQ_SRVSTATE_LISTENING);
+               unlock_service(service);
+       }
+
+       if (state->conn_state == VCHIQ_CONNSTATE_DISCONNECTED) {
+               if (queue_message(state, NULL,
+                       VCHIQ_MAKE_MSG(VCHIQ_MSG_CONNECT, 0, 0), NULL, 0,
+                       0, 1) == VCHIQ_RETRY)
+                       return VCHIQ_RETRY;
+
+               vchiq_set_conn_state(state, VCHIQ_CONNSTATE_CONNECTING);
+       }
+
+       if (state->conn_state == VCHIQ_CONNSTATE_CONNECTING) {
+               if (down_interruptible(&state->connect) != 0)
+                       return VCHIQ_RETRY;
+
+               vchiq_set_conn_state(state, VCHIQ_CONNSTATE_CONNECTED);
+               up(&state->connect);
+       }
+
+       return VCHIQ_SUCCESS;
+}
+
+VCHIQ_STATUS_T
+vchiq_shutdown_internal(VCHIQ_STATE_T *state, VCHIQ_INSTANCE_T instance)
+{
+       VCHIQ_SERVICE_T *service;
+       int i;
+
+       /* Find all services registered to this client and enable them. */
+       i = 0;
+       while ((service = next_service_by_instance(state, instance,
+               &i)) != NULL) {
+               (void)vchiq_remove_service(service->handle);
+               unlock_service(service);
+       }
+
+       return VCHIQ_SUCCESS;
+}
+
+VCHIQ_STATUS_T
+vchiq_pause_internal(VCHIQ_STATE_T *state)
+{
+       VCHIQ_STATUS_T status = VCHIQ_SUCCESS;
+
+       switch (state->conn_state) {
+       case VCHIQ_CONNSTATE_CONNECTED:
+               /* Request a pause */
+               vchiq_set_conn_state(state, VCHIQ_CONNSTATE_PAUSING);
+               request_poll(state, NULL, 0);
+               break;
+       default:
+               vchiq_log_error(vchiq_core_log_level,
+                       "vchiq_pause_internal in state %s\n",
+                       conn_state_names[state->conn_state]);
+               status = VCHIQ_ERROR;
+               VCHIQ_STATS_INC(state, error_count);
+               break;
+       }
+
+       return status;
+}
+
+VCHIQ_STATUS_T
+vchiq_resume_internal(VCHIQ_STATE_T *state)
+{
+       VCHIQ_STATUS_T status = VCHIQ_SUCCESS;
+
+       if (state->conn_state == VCHIQ_CONNSTATE_PAUSED) {
+               vchiq_set_conn_state(state, VCHIQ_CONNSTATE_RESUMING);
+               request_poll(state, NULL, 0);
+       } else {
+               status = VCHIQ_ERROR;
+               VCHIQ_STATS_INC(state, error_count);
+       }
+
+       return status;
+}
+
+VCHIQ_STATUS_T
+vchiq_close_service(VCHIQ_SERVICE_HANDLE_T handle)
+{
+       /* Unregister the service */
+       VCHIQ_SERVICE_T *service = find_service_by_handle(handle);
+       VCHIQ_STATUS_T status = VCHIQ_SUCCESS;
+
+       if (!service)
+               return VCHIQ_ERROR;
+
+       vchiq_log_info(vchiq_core_log_level,
+               "%d: close_service:%d",
+               service->state->id, service->localport);
+
+       if ((service->srvstate == VCHIQ_SRVSTATE_FREE) ||
+               (service->srvstate == VCHIQ_SRVSTATE_LISTENING) ||
+               (service->srvstate == VCHIQ_SRVSTATE_HIDDEN)) {
+               unlock_service(service);
+               return VCHIQ_ERROR;
+       }
+
+       mark_service_closing(service);
+
+       if (current == service->state->slot_handler_thread) {
+               status = vchiq_close_service_internal(service,
+                       0/*!close_recvd*/);
+               BUG_ON(status == VCHIQ_RETRY);
+       } else {
+       /* Mark the service for termination by the slot handler */
+               request_poll(service->state, service, VCHIQ_POLL_TERMINATE);
+       }
+
+       while (1) {
+               if (down_interruptible(&service->remove_event) != 0) {
+                       status = VCHIQ_RETRY;
+                       break;
+               }
+
+               if ((service->srvstate == VCHIQ_SRVSTATE_FREE) ||
+                       (service->srvstate == VCHIQ_SRVSTATE_LISTENING) ||
+                       (service->srvstate == VCHIQ_SRVSTATE_OPEN))
+                       break;
+
+               vchiq_log_warning(vchiq_core_log_level,
+                       "%d: close_service:%d - waiting in state %s",
+                       service->state->id, service->localport,
+                       srvstate_names[service->srvstate]);
+       }
+
+       if ((status == VCHIQ_SUCCESS) &&
+               (service->srvstate != VCHIQ_SRVSTATE_FREE) &&
+               (service->srvstate != VCHIQ_SRVSTATE_LISTENING))
+               status = VCHIQ_ERROR;
+
+       unlock_service(service);
+
+       return status;
+}
+
+VCHIQ_STATUS_T
+vchiq_remove_service(VCHIQ_SERVICE_HANDLE_T handle)
+{
+       /* Unregister the service */
+       VCHIQ_SERVICE_T *service = find_service_by_handle(handle);
+       VCHIQ_STATUS_T status = VCHIQ_SUCCESS;
+
+       if (!service)
+               return VCHIQ_ERROR;
+
+       vchiq_log_info(vchiq_core_log_level,
+               "%d: remove_service:%d",
+               service->state->id, service->localport);
+
+       if (service->srvstate == VCHIQ_SRVSTATE_FREE) {
+               unlock_service(service);
+               return VCHIQ_ERROR;
+       }
+
+       mark_service_closing(service);
+
+       if ((service->srvstate == VCHIQ_SRVSTATE_HIDDEN) ||
+               (current == service->state->slot_handler_thread)) {
+               /* Make it look like a client, because it must be removed and
+                  not left in the LISTENING state. */
+               service->public_fourcc = VCHIQ_FOURCC_INVALID;
+
+               status = vchiq_close_service_internal(service,
+                       0/*!close_recvd*/);
+               BUG_ON(status == VCHIQ_RETRY);
+       } else {
+               /* Mark the service for removal by the slot handler */
+               request_poll(service->state, service, VCHIQ_POLL_REMOVE);
+       }
+       while (1) {
+               if (down_interruptible(&service->remove_event) != 0) {
+                       status = VCHIQ_RETRY;
+                       break;
+               }
+
+               if ((service->srvstate == VCHIQ_SRVSTATE_FREE) ||
+                       (service->srvstate == VCHIQ_SRVSTATE_OPEN))
+                       break;
+
+               vchiq_log_warning(vchiq_core_log_level,
+                       "%d: remove_service:%d - waiting in state %s",
+                       service->state->id, service->localport,
+                       srvstate_names[service->srvstate]);
+       }
+
+       if ((status == VCHIQ_SUCCESS) &&
+               (service->srvstate != VCHIQ_SRVSTATE_FREE))
+               status = VCHIQ_ERROR;
+
+       unlock_service(service);
+
+       return status;
+}
+
+
+/* This function may be called by kernel threads or user threads.
+ * User threads may receive VCHIQ_RETRY to indicate that a signal has been
+ * received and the call should be retried after being returned to user
+ * context.
+ * When called in blocking mode, the userdata field points to a bulk_waiter
+ * structure.
+ */
+VCHIQ_STATUS_T
+vchiq_bulk_transfer(VCHIQ_SERVICE_HANDLE_T handle,
+       VCHI_MEM_HANDLE_T memhandle, void *offset, int size, void *userdata,
+       VCHIQ_BULK_MODE_T mode, VCHIQ_BULK_DIR_T dir)
+{
+       VCHIQ_SERVICE_T *service = find_service_by_handle(handle);
+       VCHIQ_BULK_QUEUE_T *queue;
+       VCHIQ_BULK_T *bulk;
+       VCHIQ_STATE_T *state;
+       struct bulk_waiter *bulk_waiter = NULL;
+       const char dir_char = (dir == VCHIQ_BULK_TRANSMIT) ? 't' : 'r';
+       const int dir_msgtype = (dir == VCHIQ_BULK_TRANSMIT) ?
+               VCHIQ_MSG_BULK_TX : VCHIQ_MSG_BULK_RX;
+       VCHIQ_STATUS_T status = VCHIQ_ERROR;
+
+       if (!service ||
+                (service->srvstate != VCHIQ_SRVSTATE_OPEN) ||
+                ((memhandle == VCHI_MEM_HANDLE_INVALID) && (offset == NULL)) ||
+                (vchiq_check_service(service) != VCHIQ_SUCCESS))
+               goto error_exit;
+
+       switch (mode) {
+       case VCHIQ_BULK_MODE_NOCALLBACK:
+       case VCHIQ_BULK_MODE_CALLBACK:
+               break;
+       case VCHIQ_BULK_MODE_BLOCKING:
+               bulk_waiter = (struct bulk_waiter *)userdata;
+               sema_init(&bulk_waiter->event, 0);
+               bulk_waiter->actual = 0;
+               bulk_waiter->bulk = NULL;
+               break;
+       case VCHIQ_BULK_MODE_WAITING:
+               bulk_waiter = (struct bulk_waiter *)userdata;
+               bulk = bulk_waiter->bulk;
+               goto waiting;
+       default:
+               goto error_exit;
+       }
+
+       state = service->state;
+
+       queue = (dir == VCHIQ_BULK_TRANSMIT) ?
+               &service->bulk_tx : &service->bulk_rx;
+
+       if (mutex_lock_interruptible(&service->bulk_mutex) != 0) {
+               status = VCHIQ_RETRY;
+               goto error_exit;
+       }
+
+       if (queue->local_insert == queue->remove + VCHIQ_NUM_SERVICE_BULKS) {
+               VCHIQ_SERVICE_STATS_INC(service, bulk_stalls);
+               do {
+                       mutex_unlock(&service->bulk_mutex);
+                       if (down_interruptible(&service->bulk_remove_event)
+                               != 0) {
+                               status = VCHIQ_RETRY;
+                               goto error_exit;
+                       }
+                       if (mutex_lock_interruptible(&service->bulk_mutex)
+                               != 0) {
+                               status = VCHIQ_RETRY;
+                               goto error_exit;
+                       }
+               } while (queue->local_insert == queue->remove +
+                               VCHIQ_NUM_SERVICE_BULKS);
+       }
+
+       bulk = &queue->bulks[BULK_INDEX(queue->local_insert)];
+
+       bulk->mode = mode;
+       bulk->dir = dir;
+       bulk->userdata = userdata;
+       bulk->size = size;
+       bulk->actual = VCHIQ_BULK_ACTUAL_ABORTED;
+
+       if (vchiq_prepare_bulk_data(bulk, memhandle, offset, size, dir) !=
+               VCHIQ_SUCCESS)
+               goto unlock_error_exit;
+
+       wmb();
+
+       vchiq_log_info(vchiq_core_log_level,
+               "%d: bt (%d->%d) %cx %x@%x %x",
+               state->id,
+               service->localport, service->remoteport, dir_char,
+               size, (unsigned int)bulk->data, (unsigned int)userdata);
+
+       if (state->is_master) {
+               queue->local_insert++;
+               if (resolve_bulks(service, queue))
+                       request_poll(state, service,
+                               (dir == VCHIQ_BULK_TRANSMIT) ?
+                               VCHIQ_POLL_TXNOTIFY : VCHIQ_POLL_RXNOTIFY);
+       } else {
+               int payload[2] = { (int)bulk->data, bulk->size };
+               VCHIQ_ELEMENT_T element = { payload, sizeof(payload) };
+
+               status = queue_message(state, NULL,
+                       VCHIQ_MAKE_MSG(dir_msgtype,
+                               service->localport, service->remoteport),
+                       &element, 1, sizeof(payload), 1);
+               if (status != VCHIQ_SUCCESS) {
+                       vchiq_complete_bulk(bulk);
+                       goto unlock_error_exit;
+               }
+               queue->local_insert++;
+       }
+
+       mutex_unlock(&service->bulk_mutex);
+
+       vchiq_log_trace(vchiq_core_log_level,
+               "%d: bt:%d %cx li=%x ri=%x p=%x",
+               state->id,
+               service->localport, dir_char,
+               queue->local_insert, queue->remote_insert, queue->process);
+
+waiting:
+       unlock_service(service);
+
+       status = VCHIQ_SUCCESS;
+
+       if (bulk_waiter) {
+               bulk_waiter->bulk = bulk;
+               if (down_interruptible(&bulk_waiter->event) != 0)
+                       status = VCHIQ_RETRY;
+               else if (bulk_waiter->actual == VCHIQ_BULK_ACTUAL_ABORTED)
+                       status = VCHIQ_ERROR;
+       }
+
+       return status;
+
+unlock_error_exit:
+       mutex_unlock(&service->bulk_mutex);
+
+error_exit:
+       if (service)
+               unlock_service(service);
+       return status;
+}
+
+VCHIQ_STATUS_T
+vchiq_queue_message(VCHIQ_SERVICE_HANDLE_T handle,
+       const VCHIQ_ELEMENT_T *elements, unsigned int count)
+{
+       VCHIQ_SERVICE_T *service = find_service_by_handle(handle);
+       VCHIQ_STATUS_T status = VCHIQ_ERROR;
+
+       unsigned int size = 0;
+       unsigned int i;
+
+       if (!service ||
+               (vchiq_check_service(service) != VCHIQ_SUCCESS))
+               goto error_exit;
+
+       for (i = 0; i < (unsigned int)count; i++) {
+               if (elements[i].size) {
+                       if (elements[i].data == NULL) {
+                               VCHIQ_SERVICE_STATS_INC(service, error_count);
+                               goto error_exit;
+                       }
+                       size += elements[i].size;
+               }
+       }
+
+       if (size > VCHIQ_MAX_MSG_SIZE) {
+               VCHIQ_SERVICE_STATS_INC(service, error_count);
+               goto error_exit;
+       }
+
+       switch (service->srvstate) {
+       case VCHIQ_SRVSTATE_OPEN:
+               status = queue_message(service->state, service,
+                               VCHIQ_MAKE_MSG(VCHIQ_MSG_DATA,
+                                       service->localport,
+                                       service->remoteport),
+                               elements, count, size, 1);
+               break;
+       case VCHIQ_SRVSTATE_OPENSYNC:
+               status = queue_message_sync(service->state, service,
+                               VCHIQ_MAKE_MSG(VCHIQ_MSG_DATA,
+                                       service->localport,
+                                       service->remoteport),
+                               elements, count, size, 1);
+               break;
+       default:
+               status = VCHIQ_ERROR;
+               break;
+       }
+
+error_exit:
+       if (service)
+               unlock_service(service);
+
+       return status;
+}
+
+void
+vchiq_release_message(VCHIQ_SERVICE_HANDLE_T handle, VCHIQ_HEADER_T *header)
+{
+       VCHIQ_SERVICE_T *service = find_service_by_handle(handle);
+       VCHIQ_SHARED_STATE_T *remote;
+       VCHIQ_STATE_T *state;
+       int slot_index;
+
+       if (!service)
+               return;
+
+       state = service->state;
+       remote = state->remote;
+
+       slot_index = SLOT_INDEX_FROM_DATA(state, (void *)header);
+
+       if ((slot_index >= remote->slot_first) &&
+               (slot_index <= remote->slot_last)) {
+               int msgid = header->msgid;
+               if (msgid & VCHIQ_MSGID_CLAIMED) {
+                       VCHIQ_SLOT_INFO_T *slot_info =
+                               SLOT_INFO_FROM_INDEX(state, slot_index);
+
+                       release_slot(state, slot_info, header, service);
+               }
+       } else if (slot_index == remote->slot_sync)
+               release_message_sync(state, header);
+
+       unlock_service(service);
+}
+
+static void
+release_message_sync(VCHIQ_STATE_T *state, VCHIQ_HEADER_T *header)
+{
+       header->msgid = VCHIQ_MSGID_PADDING;
+       wmb();
+       remote_event_signal(&state->remote->sync_release);
+}
+
+VCHIQ_STATUS_T
+vchiq_get_peer_version(VCHIQ_SERVICE_HANDLE_T handle, short *peer_version)
+{
+   VCHIQ_STATUS_T status = VCHIQ_ERROR;
+   VCHIQ_SERVICE_T *service = find_service_by_handle(handle);
+
+   if (!service ||
+      (vchiq_check_service(service) != VCHIQ_SUCCESS) ||
+      !peer_version)
+      goto exit;
+   *peer_version = service->peer_version;
+   status = VCHIQ_SUCCESS;
+
+exit:
+   if (service)
+      unlock_service(service);
+   return status;
+}
+
+VCHIQ_STATUS_T
+vchiq_get_config(VCHIQ_INSTANCE_T instance,
+       int config_size, VCHIQ_CONFIG_T *pconfig)
+{
+       VCHIQ_CONFIG_T config;
+
+       (void)instance;
+
+       config.max_msg_size           = VCHIQ_MAX_MSG_SIZE;
+       config.bulk_threshold         = VCHIQ_MAX_MSG_SIZE;
+       config.max_outstanding_bulks  = VCHIQ_NUM_SERVICE_BULKS;
+       config.max_services           = VCHIQ_MAX_SERVICES;
+       config.version                = VCHIQ_VERSION;
+       config.version_min            = VCHIQ_VERSION_MIN;
+
+       if (config_size > sizeof(VCHIQ_CONFIG_T))
+               return VCHIQ_ERROR;
+
+       memcpy(pconfig, &config,
+               min(config_size, (int)(sizeof(VCHIQ_CONFIG_T))));
+
+       return VCHIQ_SUCCESS;
+}
+
+VCHIQ_STATUS_T
+vchiq_set_service_option(VCHIQ_SERVICE_HANDLE_T handle,
+       VCHIQ_SERVICE_OPTION_T option, int value)
+{
+       VCHIQ_SERVICE_T *service = find_service_by_handle(handle);
+       VCHIQ_STATUS_T status = VCHIQ_ERROR;
+
+       if (service) {
+               switch (option) {
+               case VCHIQ_SERVICE_OPTION_AUTOCLOSE:
+                       service->auto_close = value;
+                       status = VCHIQ_SUCCESS;
+                       break;
+
+               case VCHIQ_SERVICE_OPTION_SLOT_QUOTA: {
+                       VCHIQ_SERVICE_QUOTA_T *service_quota =
+                               &service->state->service_quotas[
+                                       service->localport];
+                       if (value == 0)
+                               value = service->state->default_slot_quota;
+                       if ((value >= service_quota->slot_use_count) &&
+                                (value < (unsigned short)~0)) {
+                               service_quota->slot_quota = value;
+                               if ((value >= service_quota->slot_use_count) &&
+                                       (service_quota->message_quota >=
+                                        service_quota->message_use_count)) {
+                                       /* Signal the service that it may have
+                                       ** dropped below its quota */
+                                       up(&service_quota->quota_event);
+                               }
+                               status = VCHIQ_SUCCESS;
+                       }
+               } break;
+
+               case VCHIQ_SERVICE_OPTION_MESSAGE_QUOTA: {
+                       VCHIQ_SERVICE_QUOTA_T *service_quota =
+                               &service->state->service_quotas[
+                                       service->localport];
+                       if (value == 0)
+                               value = service->state->default_message_quota;
+                       if ((value >= service_quota->message_use_count) &&
+                                (value < (unsigned short)~0)) {
+                               service_quota->message_quota = value;
+                               if ((value >=
+                                       service_quota->message_use_count) &&
+                                       (service_quota->slot_quota >=
+                                       service_quota->slot_use_count))
+                                       /* Signal the service that it may have
+                                       ** dropped below its quota */
+                                       up(&service_quota->quota_event);
+                               status = VCHIQ_SUCCESS;
+                       }
+               } break;
+
+               case VCHIQ_SERVICE_OPTION_SYNCHRONOUS:
+                       if ((service->srvstate == VCHIQ_SRVSTATE_HIDDEN) ||
+                               (service->srvstate ==
+                               VCHIQ_SRVSTATE_LISTENING)) {
+                               service->sync = value;
+                               status = VCHIQ_SUCCESS;
+                       }
+                       break;
+
+               default:
+                       break;
+               }
+               unlock_service(service);
+       }
+
+       return status;
+}
+
+void
+vchiq_dump_shared_state(void *dump_context, VCHIQ_STATE_T *state,
+       VCHIQ_SHARED_STATE_T *shared, const char *label)
+{
+       static const char *const debug_names[] = {
+               "<entries>",
+               "SLOT_HANDLER_COUNT",
+               "SLOT_HANDLER_LINE",
+               "PARSE_LINE",
+               "PARSE_HEADER",
+               "PARSE_MSGID",
+               "AWAIT_COMPLETION_LINE",
+               "DEQUEUE_MESSAGE_LINE",
+               "SERVICE_CALLBACK_LINE",
+               "MSG_QUEUE_FULL_COUNT",
+               "COMPLETION_QUEUE_FULL_COUNT"
+       };
+       int i;
+
+       char buf[80];
+       int len;
+       len = snprintf(buf, sizeof(buf),
+               "  %s: slots %d-%d tx_pos=%x recycle=%x",
+               label, shared->slot_first, shared->slot_last,
+               shared->tx_pos, shared->slot_queue_recycle);
+       vchiq_dump(dump_context, buf, len + 1);
+
+       len = snprintf(buf, sizeof(buf),
+               "    Slots claimed:");
+       vchiq_dump(dump_context, buf, len + 1);
+
+       for (i = shared->slot_first; i <= shared->slot_last; i++) {
+               VCHIQ_SLOT_INFO_T slot_info = *SLOT_INFO_FROM_INDEX(state, i);
+               if (slot_info.use_count != slot_info.release_count) {
+                       len = snprintf(buf, sizeof(buf),
+                               "      %d: %d/%d", i, slot_info.use_count,
+                               slot_info.release_count);
+                       vchiq_dump(dump_context, buf, len + 1);
+               }
+       }
+
+       for (i = 1; i < shared->debug[DEBUG_ENTRIES]; i++) {
+               len = snprintf(buf, sizeof(buf), "    DEBUG: %s = %d(%x)",
+                       debug_names[i], shared->debug[i], shared->debug[i]);
+               vchiq_dump(dump_context, buf, len + 1);
+       }
+}
+
+void
+vchiq_dump_state(void *dump_context, VCHIQ_STATE_T *state)
+{
+       char buf[80];
+       int len;
+       int i;
+
+       len = snprintf(buf, sizeof(buf), "State %d: %s", state->id,
+               conn_state_names[state->conn_state]);
+       vchiq_dump(dump_context, buf, len + 1);
+
+       len = snprintf(buf, sizeof(buf),
+               "  tx_pos=%x(@%x), rx_pos=%x(@%x)",
+               state->local->tx_pos,
+               (uint32_t)state->tx_data +
+                       (state->local_tx_pos & VCHIQ_SLOT_MASK),
+               state->rx_pos,
+               (uint32_t)state->rx_data +
+                       (state->rx_pos & VCHIQ_SLOT_MASK));
+       vchiq_dump(dump_context, buf, len + 1);
+
+       len = snprintf(buf, sizeof(buf),
+               "  Version: %d (min %d)",
+               VCHIQ_VERSION, VCHIQ_VERSION_MIN);
+       vchiq_dump(dump_context, buf, len + 1);
+
+       if (VCHIQ_ENABLE_STATS) {
+               len = snprintf(buf, sizeof(buf),
+                       "  Stats: ctrl_tx_count=%d, ctrl_rx_count=%d, "
+                       "error_count=%d",
+                       state->stats.ctrl_tx_count, state->stats.ctrl_rx_count,
+                       state->stats.error_count);
+               vchiq_dump(dump_context, buf, len + 1);
+       }
+
+       len = snprintf(buf, sizeof(buf),
+               "  Slots: %d available (%d data), %d recyclable, %d stalls "
+               "(%d data)",
+               ((state->slot_queue_available * VCHIQ_SLOT_SIZE) -
+                       state->local_tx_pos) / VCHIQ_SLOT_SIZE,
+               state->data_quota - state->data_use_count,
+               state->local->slot_queue_recycle - state->slot_queue_available,
+               state->stats.slot_stalls, state->stats.data_stalls);
+       vchiq_dump(dump_context, buf, len + 1);
+
+       vchiq_dump_platform_state(dump_context);
+
+       vchiq_dump_shared_state(dump_context, state, state->local, "Local");
+       vchiq_dump_shared_state(dump_context, state, state->remote, "Remote");
+
+       vchiq_dump_platform_instances(dump_context);
+
+       for (i = 0; i < state->unused_service; i++) {
+               VCHIQ_SERVICE_T *service = find_service_by_port(state, i);
+
+               if (service) {
+                       vchiq_dump_service_state(dump_context, service);
+                       unlock_service(service);
+               }
+       }
+}
+
+void
+vchiq_dump_service_state(void *dump_context, VCHIQ_SERVICE_T *service)
+{
+       char buf[80];
+       int len;
+
+       len = snprintf(buf, sizeof(buf), "Service %d: %s (ref %u)",
+               service->localport, srvstate_names[service->srvstate],
+               service->ref_count - 1); /*Don't include the lock just taken*/
+
+       if (service->srvstate != VCHIQ_SRVSTATE_FREE) {
+               char remoteport[30];
+               VCHIQ_SERVICE_QUOTA_T *service_quota =
+                       &service->state->service_quotas[service->localport];
+               int fourcc = service->base.fourcc;
+               int tx_pending, rx_pending;
+               if (service->remoteport != VCHIQ_PORT_FREE) {
+                       int len2 = snprintf(remoteport, sizeof(remoteport),
+                               "%d", service->remoteport);
+                       if (service->public_fourcc != VCHIQ_FOURCC_INVALID)
+                               snprintf(remoteport + len2,
+                                       sizeof(remoteport) - len2,
+                                       " (client %x)", service->client_id);
+               } else
+                       strcpy(remoteport, "n/a");
+
+               len += snprintf(buf + len, sizeof(buf) - len,
+                       " '%c%c%c%c' remote %s (msg use %d/%d, slot use %d/%d)",
+                       VCHIQ_FOURCC_AS_4CHARS(fourcc),
+                       remoteport,
+                       service_quota->message_use_count,
+                       service_quota->message_quota,
+                       service_quota->slot_use_count,
+                       service_quota->slot_quota);
+
+               vchiq_dump(dump_context, buf, len + 1);
+
+               tx_pending = service->bulk_tx.local_insert -
+                       service->bulk_tx.remote_insert;
+
+               rx_pending = service->bulk_rx.local_insert -
+                       service->bulk_rx.remote_insert;
+
+               len = snprintf(buf, sizeof(buf),
+                       "  Bulk: tx_pending=%d (size %d),"
+                       " rx_pending=%d (size %d)",
+                       tx_pending,
+                       tx_pending ? service->bulk_tx.bulks[
+                       BULK_INDEX(service->bulk_tx.remove)].size : 0,
+                       rx_pending,
+                       rx_pending ? service->bulk_rx.bulks[
+                       BULK_INDEX(service->bulk_rx.remove)].size : 0);
+
+               if (VCHIQ_ENABLE_STATS) {
+                       vchiq_dump(dump_context, buf, len + 1);
+
+                       len = snprintf(buf, sizeof(buf),
+                               "  Ctrl: tx_count=%d, tx_bytes=%llu, "
+                               "rx_count=%d, rx_bytes=%llu",
+                               service->stats.ctrl_tx_count,
+                               service->stats.ctrl_tx_bytes,
+                               service->stats.ctrl_rx_count,
+                               service->stats.ctrl_rx_bytes);
+                       vchiq_dump(dump_context, buf, len + 1);
+
+                       len = snprintf(buf, sizeof(buf),
+                               "  Bulk: tx_count=%d, tx_bytes=%llu, "
+                               "rx_count=%d, rx_bytes=%llu",
+                               service->stats.bulk_tx_count,
+                               service->stats.bulk_tx_bytes,
+                               service->stats.bulk_rx_count,
+                               service->stats.bulk_rx_bytes);
+                       vchiq_dump(dump_context, buf, len + 1);
+
+                       len = snprintf(buf, sizeof(buf),
+                               "  %d quota stalls, %d slot stalls, "
+                               "%d bulk stalls, %d aborted, %d errors",
+                               service->stats.quota_stalls,
+                               service->stats.slot_stalls,
+                               service->stats.bulk_stalls,
+                               service->stats.bulk_aborted_count,
+                               service->stats.error_count);
+                }
+       }
+
+       vchiq_dump(dump_context, buf, len + 1);
+
+       if (service->srvstate != VCHIQ_SRVSTATE_FREE)
+               vchiq_dump_platform_service_state(dump_context, service);
+}
+
+
+void
+vchiq_loud_error_header(void)
+{
+       vchiq_log_error(vchiq_core_log_level,
+               "============================================================"
+               "================");
+       vchiq_log_error(vchiq_core_log_level,
+               "============================================================"
+               "================");
+       vchiq_log_error(vchiq_core_log_level, "=====");
+}
+
+void
+vchiq_loud_error_footer(void)
+{
+       vchiq_log_error(vchiq_core_log_level, "=====");
+       vchiq_log_error(vchiq_core_log_level,
+               "============================================================"
+               "================");
+       vchiq_log_error(vchiq_core_log_level,
+               "============================================================"
+               "================");
+}
+
+
+VCHIQ_STATUS_T vchiq_send_remote_use(VCHIQ_STATE_T *state)
+{
+       VCHIQ_STATUS_T status = VCHIQ_RETRY;
+       if (state->conn_state != VCHIQ_CONNSTATE_DISCONNECTED)
+               status = queue_message(state, NULL,
+                       VCHIQ_MAKE_MSG(VCHIQ_MSG_REMOTE_USE, 0, 0),
+                       NULL, 0, 0, 0);
+       return status;
+}
+
+VCHIQ_STATUS_T vchiq_send_remote_release(VCHIQ_STATE_T *state)
+{
+       VCHIQ_STATUS_T status = VCHIQ_RETRY;
+       if (state->conn_state != VCHIQ_CONNSTATE_DISCONNECTED)
+               status = queue_message(state, NULL,
+                       VCHIQ_MAKE_MSG(VCHIQ_MSG_REMOTE_RELEASE, 0, 0),
+                       NULL, 0, 0, 0);
+       return status;
+}
+
+VCHIQ_STATUS_T vchiq_send_remote_use_active(VCHIQ_STATE_T *state)
+{
+       VCHIQ_STATUS_T status = VCHIQ_RETRY;
+       if (state->conn_state != VCHIQ_CONNSTATE_DISCONNECTED)
+               status = queue_message(state, NULL,
+                       VCHIQ_MAKE_MSG(VCHIQ_MSG_REMOTE_USE_ACTIVE, 0, 0),
+                       NULL, 0, 0, 0);
+       return status;
+}
+
+void vchiq_log_dump_mem(const char *label, uint32_t addr, const void *voidMem,
+       size_t numBytes)
+{
+       const uint8_t  *mem = (const uint8_t *)voidMem;
+       size_t          offset;
+       char            lineBuf[100];
+       char           *s;
+
+       while (numBytes > 0) {
+               s = lineBuf;
+
+               for (offset = 0; offset < 16; offset++) {
+                       if (offset < numBytes)
+                               s += snprintf(s, 4, "%02x ", mem[offset]);
+                       else
+                               s += snprintf(s, 4, "   ");
+               }
+
+               for (offset = 0; offset < 16; offset++) {
+                       if (offset < numBytes) {
+                               uint8_t ch = mem[offset];
+
+                               if ((ch < ' ') || (ch > '~'))
+                                       ch = '.';
+                               *s++ = (char)ch;
+                       }
+               }
+               *s++ = '\0';
+
+               if ((label != NULL) && (*label != '\0'))
+                       vchiq_log_trace(VCHIQ_LOG_TRACE,
+                               "%s: %08x: %s", label, addr, lineBuf);
+               else
+                       vchiq_log_trace(VCHIQ_LOG_TRACE,
+                               "%08x: %s", addr, lineBuf);
+
+               addr += 16;
+               mem += 16;
+               if (numBytes > 16)
+                       numBytes -= 16;
+               else
+                       numBytes = 0;
+       }
+}
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.h
@@ -0,0 +1,706 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHIQ_CORE_H
+#define VCHIQ_CORE_H
+
+#include <linux/mutex.h>
+#include <linux/semaphore.h>
+#include <linux/kthread.h>
+
+#include "vchiq_cfg.h"
+
+#include "vchiq.h"
+
+/* Run time control of log level, based on KERN_XXX level. */
+#define VCHIQ_LOG_DEFAULT  4
+#define VCHIQ_LOG_ERROR    3
+#define VCHIQ_LOG_WARNING  4
+#define VCHIQ_LOG_INFO     6
+#define VCHIQ_LOG_TRACE    7
+
+#define VCHIQ_LOG_PREFIX   KERN_INFO "vchiq: "
+
+#ifndef vchiq_log_error
+#define vchiq_log_error(cat, fmt, ...) \
+       do { if (cat >= VCHIQ_LOG_ERROR) \
+               printk(VCHIQ_LOG_PREFIX fmt "\n", ##__VA_ARGS__); } while (0)
+#endif
+#ifndef vchiq_log_warning
+#define vchiq_log_warning(cat, fmt, ...) \
+       do { if (cat >= VCHIQ_LOG_WARNING) \
+                printk(VCHIQ_LOG_PREFIX fmt "\n", ##__VA_ARGS__); } while (0)
+#endif
+#ifndef vchiq_log_info
+#define vchiq_log_info(cat, fmt, ...) \
+       do { if (cat >= VCHIQ_LOG_INFO) \
+               printk(VCHIQ_LOG_PREFIX fmt "\n", ##__VA_ARGS__); } while (0)
+#endif
+#ifndef vchiq_log_trace
+#define vchiq_log_trace(cat, fmt, ...) \
+       do { if (cat >= VCHIQ_LOG_TRACE) \
+               printk(VCHIQ_LOG_PREFIX fmt "\n", ##__VA_ARGS__); } while (0)
+#endif
+
+#define vchiq_loud_error(...) \
+       vchiq_log_error(vchiq_core_log_level, "===== " __VA_ARGS__)
+
+#ifndef vchiq_static_assert
+#define vchiq_static_assert(cond) __attribute__((unused)) \
+       extern int vchiq_static_assert[(cond) ? 1 : -1]
+#endif
+
+#define IS_POW2(x) (x && ((x & (x - 1)) == 0))
+
+/* Ensure that the slot size and maximum number of slots are powers of 2 */
+vchiq_static_assert(IS_POW2(VCHIQ_SLOT_SIZE));
+vchiq_static_assert(IS_POW2(VCHIQ_MAX_SLOTS));
+vchiq_static_assert(IS_POW2(VCHIQ_MAX_SLOTS_PER_SIDE));
+
+#define VCHIQ_SLOT_MASK        (VCHIQ_SLOT_SIZE - 1)
+#define VCHIQ_SLOT_QUEUE_MASK  (VCHIQ_MAX_SLOTS_PER_SIDE - 1)
+#define VCHIQ_SLOT_ZERO_SLOTS  ((sizeof(VCHIQ_SLOT_ZERO_T) + \
+       VCHIQ_SLOT_SIZE - 1) / VCHIQ_SLOT_SIZE)
+
+#define VCHIQ_MSG_PADDING            0  /* -                                 */
+#define VCHIQ_MSG_CONNECT            1  /* -                                 */
+#define VCHIQ_MSG_OPEN               2  /* + (srcport, -), fourcc, client_id */
+#define VCHIQ_MSG_OPENACK            3  /* + (srcport, dstport)              */
+#define VCHIQ_MSG_CLOSE              4  /* + (srcport, dstport)              */
+#define VCHIQ_MSG_DATA               5  /* + (srcport, dstport)              */
+#define VCHIQ_MSG_BULK_RX            6  /* + (srcport, dstport), data, size  */
+#define VCHIQ_MSG_BULK_TX            7  /* + (srcport, dstport), data, size  */
+#define VCHIQ_MSG_BULK_RX_DONE       8  /* + (srcport, dstport), actual      */
+#define VCHIQ_MSG_BULK_TX_DONE       9  /* + (srcport, dstport), actual      */
+#define VCHIQ_MSG_PAUSE             10  /* -                                 */
+#define VCHIQ_MSG_RESUME            11  /* -                                 */
+#define VCHIQ_MSG_REMOTE_USE        12  /* -                                 */
+#define VCHIQ_MSG_REMOTE_RELEASE    13  /* -                                 */
+#define VCHIQ_MSG_REMOTE_USE_ACTIVE 14  /* -                                 */
+
+#define VCHIQ_PORT_MAX                 (VCHIQ_MAX_SERVICES - 1)
+#define VCHIQ_PORT_FREE                0x1000
+#define VCHIQ_PORT_IS_VALID(port)      (port < VCHIQ_PORT_FREE)
+#define VCHIQ_MAKE_MSG(type, srcport, dstport) \
+       ((type<<24) | (srcport<<12) | (dstport<<0))
+#define VCHIQ_MSG_TYPE(msgid)          ((unsigned int)msgid >> 24)
+#define VCHIQ_MSG_SRCPORT(msgid) \
+       (unsigned short)(((unsigned int)msgid >> 12) & 0xfff)
+#define VCHIQ_MSG_DSTPORT(msgid) \
+       ((unsigned short)msgid & 0xfff)
+
+#define VCHIQ_FOURCC_AS_4CHARS(fourcc) \
+       ((fourcc) >> 24) & 0xff, \
+       ((fourcc) >> 16) & 0xff, \
+       ((fourcc) >>  8) & 0xff, \
+       (fourcc) & 0xff
+
+/* Ensure the fields are wide enough */
+vchiq_static_assert(VCHIQ_MSG_SRCPORT(VCHIQ_MAKE_MSG(0, 0, VCHIQ_PORT_MAX))
+       == 0);
+vchiq_static_assert(VCHIQ_MSG_TYPE(VCHIQ_MAKE_MSG(0, VCHIQ_PORT_MAX, 0)) == 0);
+vchiq_static_assert((unsigned int)VCHIQ_PORT_MAX <
+       (unsigned int)VCHIQ_PORT_FREE);
+
+#define VCHIQ_MSGID_PADDING            VCHIQ_MAKE_MSG(VCHIQ_MSG_PADDING, 0, 0)
+#define VCHIQ_MSGID_CLAIMED            0x40000000
+
+#define VCHIQ_FOURCC_INVALID           0x00000000
+#define VCHIQ_FOURCC_IS_LEGAL(fourcc)  (fourcc != VCHIQ_FOURCC_INVALID)
+
+#define VCHIQ_BULK_ACTUAL_ABORTED -1
+
+typedef uint32_t BITSET_T;
+
+vchiq_static_assert((sizeof(BITSET_T) * 8) == 32);
+
+#define BITSET_SIZE(b)        ((b + 31) >> 5)
+#define BITSET_WORD(b)        (b >> 5)
+#define BITSET_BIT(b)         (1 << (b & 31))
+#define BITSET_ZERO(bs)       memset(bs, 0, sizeof(bs))
+#define BITSET_IS_SET(bs, b)  (bs[BITSET_WORD(b)] & BITSET_BIT(b))
+#define BITSET_SET(bs, b)     (bs[BITSET_WORD(b)] |= BITSET_BIT(b))
+#define BITSET_CLR(bs, b)     (bs[BITSET_WORD(b)] &= ~BITSET_BIT(b))
+
+#if VCHIQ_ENABLE_STATS
+#define VCHIQ_STATS_INC(state, stat) (state->stats. stat++)
+#define VCHIQ_SERVICE_STATS_INC(service, stat) (service->stats. stat++)
+#define VCHIQ_SERVICE_STATS_ADD(service, stat, addend) \
+       (service->stats. stat += addend)
+#else
+#define VCHIQ_STATS_INC(state, stat) ((void)0)
+#define VCHIQ_SERVICE_STATS_INC(service, stat) ((void)0)
+#define VCHIQ_SERVICE_STATS_ADD(service, stat, addend) ((void)0)
+#endif
+
+enum {
+       DEBUG_ENTRIES,
+#if VCHIQ_ENABLE_DEBUG
+       DEBUG_SLOT_HANDLER_COUNT,
+       DEBUG_SLOT_HANDLER_LINE,
+       DEBUG_PARSE_LINE,
+       DEBUG_PARSE_HEADER,
+       DEBUG_PARSE_MSGID,
+       DEBUG_AWAIT_COMPLETION_LINE,
+       DEBUG_DEQUEUE_MESSAGE_LINE,
+       DEBUG_SERVICE_CALLBACK_LINE,
+       DEBUG_MSG_QUEUE_FULL_COUNT,
+       DEBUG_COMPLETION_QUEUE_FULL_COUNT,
+#endif
+       DEBUG_MAX
+};
+
+#if VCHIQ_ENABLE_DEBUG
+
+#define DEBUG_INITIALISE(local) int *debug_ptr = (local)->debug;
+#define DEBUG_TRACE(d) \
+       do { debug_ptr[DEBUG_ ## d] = __LINE__; dsb(); } while (0)
+#define DEBUG_VALUE(d, v) \
+       do { debug_ptr[DEBUG_ ## d] = (v); dsb(); } while (0)
+#define DEBUG_COUNT(d) \
+       do { debug_ptr[DEBUG_ ## d]++; dsb(); } while (0)
+
+#else /* VCHIQ_ENABLE_DEBUG */
+
+#define DEBUG_INITIALISE(local)
+#define DEBUG_TRACE(d)
+#define DEBUG_VALUE(d, v)
+#define DEBUG_COUNT(d)
+
+#endif /* VCHIQ_ENABLE_DEBUG */
+
+typedef enum {
+       VCHIQ_CONNSTATE_DISCONNECTED,
+       VCHIQ_CONNSTATE_CONNECTING,
+       VCHIQ_CONNSTATE_CONNECTED,
+       VCHIQ_CONNSTATE_PAUSING,
+       VCHIQ_CONNSTATE_PAUSE_SENT,
+       VCHIQ_CONNSTATE_PAUSED,
+       VCHIQ_CONNSTATE_RESUMING,
+       VCHIQ_CONNSTATE_PAUSE_TIMEOUT,
+       VCHIQ_CONNSTATE_RESUME_TIMEOUT
+} VCHIQ_CONNSTATE_T;
+
+enum {
+       VCHIQ_SRVSTATE_FREE,
+       VCHIQ_SRVSTATE_HIDDEN,
+       VCHIQ_SRVSTATE_LISTENING,
+       VCHIQ_SRVSTATE_OPENING,
+       VCHIQ_SRVSTATE_OPEN,
+       VCHIQ_SRVSTATE_OPENSYNC,
+       VCHIQ_SRVSTATE_CLOSESENT,
+       VCHIQ_SRVSTATE_CLOSERECVD,
+       VCHIQ_SRVSTATE_CLOSEWAIT,
+       VCHIQ_SRVSTATE_CLOSED
+};
+
+enum {
+       VCHIQ_POLL_TERMINATE,
+       VCHIQ_POLL_REMOVE,
+       VCHIQ_POLL_TXNOTIFY,
+       VCHIQ_POLL_RXNOTIFY,
+       VCHIQ_POLL_COUNT
+};
+
+typedef enum {
+       VCHIQ_BULK_TRANSMIT,
+       VCHIQ_BULK_RECEIVE
+} VCHIQ_BULK_DIR_T;
+
+typedef void (*VCHIQ_USERDATA_TERM_T)(void *userdata);
+
+typedef struct vchiq_bulk_struct {
+       short mode;
+       short dir;
+       void *userdata;
+       VCHI_MEM_HANDLE_T handle;
+       void *data;
+       int size;
+       void *remote_data;
+       int remote_size;
+       int actual;
+} VCHIQ_BULK_T;
+
+typedef struct vchiq_bulk_queue_struct {
+       int local_insert;  /* Where to insert the next local bulk */
+       int remote_insert; /* Where to insert the next remote bulk (master) */
+       int process;       /* Bulk to transfer next */
+       int remote_notify; /* Bulk to notify the remote client of next (mstr) */
+       int remove;        /* Bulk to notify the local client of, and remove,
+                          ** next */
+       VCHIQ_BULK_T bulks[VCHIQ_NUM_SERVICE_BULKS];
+} VCHIQ_BULK_QUEUE_T;
+
+typedef struct remote_event_struct {
+       int armed;
+       int fired;
+       struct semaphore *event;
+} REMOTE_EVENT_T;
+
+typedef struct opaque_platform_state_t *VCHIQ_PLATFORM_STATE_T;
+
+typedef struct vchiq_state_struct VCHIQ_STATE_T;
+
+typedef struct vchiq_slot_struct {
+       char data[VCHIQ_SLOT_SIZE];
+} VCHIQ_SLOT_T;
+
+typedef struct vchiq_slot_info_struct {
+       /* Use two counters rather than one to avoid the need for a mutex. */
+       short use_count;
+       short release_count;
+} VCHIQ_SLOT_INFO_T;
+
+typedef struct vchiq_service_struct {
+       VCHIQ_SERVICE_BASE_T base;
+       VCHIQ_SERVICE_HANDLE_T handle;
+       unsigned int ref_count;
+       int srvstate;
+       VCHIQ_USERDATA_TERM_T userdata_term;
+       unsigned int localport;
+       unsigned int remoteport;
+       int public_fourcc;
+       int client_id;
+       char auto_close;
+       char sync;
+       char closing;
+       atomic_t poll_flags;
+       short version;
+       short version_min;
+       short peer_version;
+
+       VCHIQ_STATE_T *state;
+       VCHIQ_INSTANCE_T instance;
+
+       int service_use_count;
+
+       VCHIQ_BULK_QUEUE_T bulk_tx;
+       VCHIQ_BULK_QUEUE_T bulk_rx;
+
+       struct semaphore remove_event;
+       struct semaphore bulk_remove_event;
+       struct mutex bulk_mutex;
+
+       struct service_stats_struct {
+               int quota_stalls;
+               int slot_stalls;
+               int bulk_stalls;
+               int error_count;
+               int ctrl_tx_count;
+               int ctrl_rx_count;
+               int bulk_tx_count;
+               int bulk_rx_count;
+               int bulk_aborted_count;
+               uint64_t ctrl_tx_bytes;
+               uint64_t ctrl_rx_bytes;
+               uint64_t bulk_tx_bytes;
+               uint64_t bulk_rx_bytes;
+       } stats;
+} VCHIQ_SERVICE_T;
+
+/* The quota information is outside VCHIQ_SERVICE_T so that it can be
+       statically allocated, since for accounting reasons a service's slot
+       usage is carried over between users of the same port number.
+ */
+typedef struct vchiq_service_quota_struct {
+       unsigned short slot_quota;
+       unsigned short slot_use_count;
+       unsigned short message_quota;
+       unsigned short message_use_count;
+       struct semaphore quota_event;
+       int previous_tx_index;
+} VCHIQ_SERVICE_QUOTA_T;
+
+typedef struct vchiq_shared_state_struct {
+
+       /* A non-zero value here indicates that the content is valid. */
+       int initialised;
+
+       /* The first and last (inclusive) slots allocated to the owner. */
+       int slot_first;
+       int slot_last;
+
+       /* The slot allocated to synchronous messages from the owner. */
+       int slot_sync;
+
+       /* Signalling this event indicates that owner's slot handler thread
+       ** should run. */
+       REMOTE_EVENT_T trigger;
+
+       /* Indicates the byte position within the stream where the next message
+       ** will be written. The least significant bits are an index into the
+       ** slot. The next bits are the index of the slot in slot_queue. */
+       int tx_pos;
+
+       /* This event should be signalled when a slot is recycled. */
+       REMOTE_EVENT_T recycle;
+
+       /* The slot_queue index where the next recycled slot will be written. */
+       int slot_queue_recycle;
+
+       /* This event should be signalled when a synchronous message is sent. */
+       REMOTE_EVENT_T sync_trigger;
+
+       /* This event should be signalled when a synchronous message has been
+       ** released. */
+       REMOTE_EVENT_T sync_release;
+
+       /* A circular buffer of slot indexes. */
+       int slot_queue[VCHIQ_MAX_SLOTS_PER_SIDE];
+
+       /* Debugging state */
+       int debug[DEBUG_MAX];
+} VCHIQ_SHARED_STATE_T;
+
+typedef struct vchiq_slot_zero_struct {
+       int magic;
+       short version;
+       short version_min;
+       int slot_zero_size;
+       int slot_size;
+       int max_slots;
+       int max_slots_per_side;
+       int platform_data[2];
+       VCHIQ_SHARED_STATE_T master;
+       VCHIQ_SHARED_STATE_T slave;
+       VCHIQ_SLOT_INFO_T slots[VCHIQ_MAX_SLOTS];
+} VCHIQ_SLOT_ZERO_T;
+
+struct vchiq_state_struct {
+       int id;
+       int initialised;
+       VCHIQ_CONNSTATE_T conn_state;
+       int is_master;
+
+       VCHIQ_SHARED_STATE_T *local;
+       VCHIQ_SHARED_STATE_T *remote;
+       VCHIQ_SLOT_T *slot_data;
+
+       unsigned short default_slot_quota;
+       unsigned short default_message_quota;
+
+       /* Event indicating connect message received */
+       struct semaphore connect;
+
+       /* Mutex protecting services */
+       struct mutex mutex;
+       VCHIQ_INSTANCE_T *instance;
+
+       /* Processes incoming messages */
+       struct task_struct *slot_handler_thread;
+
+       /* Processes recycled slots */
+       struct task_struct *recycle_thread;
+
+       /* Processes synchronous messages */
+       struct task_struct *sync_thread;
+
+       /* Local implementation of the trigger remote event */
+       struct semaphore trigger_event;
+
+       /* Local implementation of the recycle remote event */
+       struct semaphore recycle_event;
+
+       /* Local implementation of the sync trigger remote event */
+       struct semaphore sync_trigger_event;
+
+       /* Local implementation of the sync release remote event */
+       struct semaphore sync_release_event;
+
+       char *tx_data;
+       char *rx_data;
+       VCHIQ_SLOT_INFO_T *rx_info;
+
+       struct mutex slot_mutex;
+
+       struct mutex recycle_mutex;
+
+       struct mutex sync_mutex;
+
+       struct mutex bulk_transfer_mutex;
+
+       /* Indicates the byte position within the stream from where the next
+       ** message will be read. The least significant bits are an index into
+       ** the slot.The next bits are the index of the slot in
+       ** remote->slot_queue. */
+       int rx_pos;
+
+       /* A cached copy of local->tx_pos. Only write to local->tx_pos, and read
+               from remote->tx_pos. */
+       int local_tx_pos;
+
+       /* The slot_queue index of the slot to become available next. */
+       int slot_queue_available;
+
+       /* A flag to indicate if any poll has been requested */
+       int poll_needed;
+
+       /* Ths index of the previous slot used for data messages. */
+       int previous_data_index;
+
+       /* The number of slots occupied by data messages. */
+       unsigned short data_use_count;
+
+       /* The maximum number of slots to be occupied by data messages. */
+       unsigned short data_quota;
+
+       /* An array of bit sets indicating which services must be polled. */
+       atomic_t poll_services[BITSET_SIZE(VCHIQ_MAX_SERVICES)];
+
+       /* The number of the first unused service */
+       int unused_service;
+
+       /* Signalled when a free slot becomes available. */
+       struct semaphore slot_available_event;
+
+       struct semaphore slot_remove_event;
+
+       /* Signalled when a free data slot becomes available. */
+       struct semaphore data_quota_event;
+
+       /* Incremented when there are bulk transfers which cannot be processed
+        * whilst paused and must be processed on resume */
+       int deferred_bulks;
+
+       struct state_stats_struct {
+               int slot_stalls;
+               int data_stalls;
+               int ctrl_tx_count;
+               int ctrl_rx_count;
+               int error_count;
+       } stats;
+
+       VCHIQ_SERVICE_T * services[VCHIQ_MAX_SERVICES];
+       VCHIQ_SERVICE_QUOTA_T service_quotas[VCHIQ_MAX_SERVICES];
+       VCHIQ_SLOT_INFO_T slot_info[VCHIQ_MAX_SLOTS];
+
+       VCHIQ_PLATFORM_STATE_T platform_state;
+};
+
+struct bulk_waiter {
+       VCHIQ_BULK_T *bulk;
+       struct semaphore event;
+       int actual;
+};
+
+extern spinlock_t bulk_waiter_spinlock;
+
+extern int vchiq_core_log_level;
+extern int vchiq_core_msg_log_level;
+extern int vchiq_sync_log_level;
+
+extern VCHIQ_STATE_T *vchiq_states[VCHIQ_MAX_STATES];
+
+extern const char *
+get_conn_state_name(VCHIQ_CONNSTATE_T conn_state);
+
+extern VCHIQ_SLOT_ZERO_T *
+vchiq_init_slots(void *mem_base, int mem_size);
+
+extern VCHIQ_STATUS_T
+vchiq_init_state(VCHIQ_STATE_T *state, VCHIQ_SLOT_ZERO_T *slot_zero,
+       int is_master);
+
+extern VCHIQ_STATUS_T
+vchiq_connect_internal(VCHIQ_STATE_T *state, VCHIQ_INSTANCE_T instance);
+
+extern VCHIQ_SERVICE_T *
+vchiq_add_service_internal(VCHIQ_STATE_T *state,
+       const VCHIQ_SERVICE_PARAMS_T *params, int srvstate,
+       VCHIQ_INSTANCE_T instance, VCHIQ_USERDATA_TERM_T userdata_term);
+
+extern VCHIQ_STATUS_T
+vchiq_open_service_internal(VCHIQ_SERVICE_T *service, int client_id);
+
+extern VCHIQ_STATUS_T
+vchiq_close_service_internal(VCHIQ_SERVICE_T *service, int close_recvd);
+
+extern void
+vchiq_terminate_service_internal(VCHIQ_SERVICE_T *service);
+
+extern void
+vchiq_free_service_internal(VCHIQ_SERVICE_T *service);
+
+extern VCHIQ_STATUS_T
+vchiq_shutdown_internal(VCHIQ_STATE_T *state, VCHIQ_INSTANCE_T instance);
+
+extern VCHIQ_STATUS_T
+vchiq_pause_internal(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATUS_T
+vchiq_resume_internal(VCHIQ_STATE_T *state);
+
+extern void
+remote_event_pollall(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATUS_T
+vchiq_bulk_transfer(VCHIQ_SERVICE_HANDLE_T handle,
+       VCHI_MEM_HANDLE_T memhandle, void *offset, int size, void *userdata,
+       VCHIQ_BULK_MODE_T mode, VCHIQ_BULK_DIR_T dir);
+
+extern void
+vchiq_dump_state(void *dump_context, VCHIQ_STATE_T *state);
+
+extern void
+vchiq_dump_service_state(void *dump_context, VCHIQ_SERVICE_T *service);
+
+extern void
+vchiq_loud_error_header(void);
+
+extern void
+vchiq_loud_error_footer(void);
+
+extern void
+request_poll(VCHIQ_STATE_T *state, VCHIQ_SERVICE_T *service, int poll_type);
+
+static inline VCHIQ_SERVICE_T *
+handle_to_service(VCHIQ_SERVICE_HANDLE_T handle)
+{
+       VCHIQ_STATE_T *state = vchiq_states[(handle / VCHIQ_MAX_SERVICES) &
+               (VCHIQ_MAX_STATES - 1)];
+       if (!state)
+               return NULL;
+
+       return state->services[handle & (VCHIQ_MAX_SERVICES - 1)];
+}
+
+extern VCHIQ_SERVICE_T *
+find_service_by_handle(VCHIQ_SERVICE_HANDLE_T handle);
+
+extern VCHIQ_SERVICE_T *
+find_service_by_port(VCHIQ_STATE_T *state, int localport);
+
+extern VCHIQ_SERVICE_T *
+find_service_for_instance(VCHIQ_INSTANCE_T instance,
+       VCHIQ_SERVICE_HANDLE_T handle);
+
+extern VCHIQ_SERVICE_T *
+next_service_by_instance(VCHIQ_STATE_T *state, VCHIQ_INSTANCE_T instance,
+       int *pidx);
+
+extern void
+lock_service(VCHIQ_SERVICE_T *service);
+
+extern void
+unlock_service(VCHIQ_SERVICE_T *service);
+
+/* The following functions are called from vchiq_core, and external
+** implementations must be provided. */
+
+extern VCHIQ_STATUS_T
+vchiq_prepare_bulk_data(VCHIQ_BULK_T *bulk,
+       VCHI_MEM_HANDLE_T memhandle, void *offset, int size, int dir);
+
+extern void
+vchiq_transfer_bulk(VCHIQ_BULK_T *bulk);
+
+extern void
+vchiq_complete_bulk(VCHIQ_BULK_T *bulk);
+
+extern VCHIQ_STATUS_T
+vchiq_copy_from_user(void *dst, const void *src, int size);
+
+extern void
+remote_event_signal(REMOTE_EVENT_T *event);
+
+void
+vchiq_platform_check_suspend(VCHIQ_STATE_T *state);
+
+extern void
+vchiq_platform_paused(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATUS_T
+vchiq_platform_resume(VCHIQ_STATE_T *state);
+
+extern void
+vchiq_platform_resumed(VCHIQ_STATE_T *state);
+
+extern void
+vchiq_dump(void *dump_context, const char *str, int len);
+
+extern void
+vchiq_dump_platform_state(void *dump_context);
+
+extern void
+vchiq_dump_platform_instances(void *dump_context);
+
+extern void
+vchiq_dump_platform_service_state(void *dump_context,
+       VCHIQ_SERVICE_T *service);
+
+extern VCHIQ_STATUS_T
+vchiq_use_service_internal(VCHIQ_SERVICE_T *service);
+
+extern VCHIQ_STATUS_T
+vchiq_release_service_internal(VCHIQ_SERVICE_T *service);
+
+extern void
+vchiq_on_remote_use(VCHIQ_STATE_T *state);
+
+extern void
+vchiq_on_remote_release(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATUS_T
+vchiq_platform_init_state(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATUS_T
+vchiq_check_service(VCHIQ_SERVICE_T *service);
+
+extern void
+vchiq_on_remote_use_active(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATUS_T
+vchiq_send_remote_use(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATUS_T
+vchiq_send_remote_release(VCHIQ_STATE_T *state);
+
+extern VCHIQ_STATUS_T
+vchiq_send_remote_use_active(VCHIQ_STATE_T *state);
+
+extern void
+vchiq_platform_conn_state_changed(VCHIQ_STATE_T *state,
+       VCHIQ_CONNSTATE_T oldstate, VCHIQ_CONNSTATE_T newstate);
+
+extern void
+vchiq_platform_handle_timeout(VCHIQ_STATE_T *state);
+
+extern void
+vchiq_set_conn_state(VCHIQ_STATE_T *state, VCHIQ_CONNSTATE_T newstate);
+
+
+extern void
+vchiq_log_dump_mem(const char *label, uint32_t addr, const void *voidMem,
+       size_t numBytes);
+
+#endif
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_genversion
@@ -0,0 +1,87 @@
+#!/usr/bin/perl -w
+
+use strict;
+
+#
+# Generate a version from available information
+#
+
+my $prefix = shift @ARGV;
+my $root = shift @ARGV;
+
+
+if ( not defined $root ) {
+       die "usage: $0 prefix root-dir\n";
+}
+
+if ( ! -d $root ) {
+       die "root directory $root not found\n";
+}
+
+my $version = "unknown";
+my $tainted = "";
+
+if ( -d "$root/.git" ) {
+       # attempt to work out git version. only do so
+       # on a linux build host, as cygwin builds are
+       # already slow enough
+
+       if ( -f "/usr/bin/git" || -f "/usr/local/bin/git" ) {
+               if (not open(F, "git --git-dir $root/.git rev-parse --verify HEAD|")) {
+                       $version = "no git version";
+               }
+               else {
+                       $version = <F>;
+                       $version =~ s/[ \r\n]*$//;     # chomp may not be enough (cygwin).
+                       $version =~ s/^[ \r\n]*//;     # chomp may not be enough (cygwin).
+               }
+
+               if (open(G, "git --git-dir $root/.git status --porcelain|")) {
+                       $tainted = <G>;
+                       $tainted =~ s/[ \r\n]*$//;     # chomp may not be enough (cygwin).
+                       $tainted =~ s/^[ \r\n]*//;     # chomp may not be enough (cygwin).
+                       if (length $tainted) {
+                       $version = join ' ', $version, "(tainted)";
+               }
+               else {
+                       $version = join ' ', $version, "(clean)";
+         }
+               }
+       }
+}
+
+my $hostname = `hostname`;
+$hostname =~ s/[ \r\n]*$//;     # chomp may not be enough (cygwin).
+$hostname =~ s/^[ \r\n]*//;     # chomp may not be enough (cygwin).
+
+
+print STDERR "Version $version\n";
+print <<EOF;
+#include "${prefix}_build_info.h"
+#include <linux/broadcom/vc_debug_sym.h>
+
+VC_DEBUG_DECLARE_STRING_VAR( ${prefix}_build_hostname, "$hostname" );
+VC_DEBUG_DECLARE_STRING_VAR( ${prefix}_build_version, "$version" );
+VC_DEBUG_DECLARE_STRING_VAR( ${prefix}_build_time,    __TIME__ );
+VC_DEBUG_DECLARE_STRING_VAR( ${prefix}_build_date,    __DATE__ );
+
+const char *vchiq_get_build_hostname( void )
+{
+   return vchiq_build_hostname;
+}
+
+const char *vchiq_get_build_version( void )
+{
+   return vchiq_build_version;
+}
+
+const char *vchiq_get_build_date( void )
+{
+   return vchiq_build_date;
+}
+
+const char *vchiq_get_build_time( void )
+{
+   return vchiq_build_time;
+}
+EOF
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_if.h
@@ -0,0 +1,188 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHIQ_IF_H
+#define VCHIQ_IF_H
+
+#include "interface/vchi/vchi_mh.h"
+
+#define VCHIQ_SERVICE_HANDLE_INVALID 0
+
+#define VCHIQ_SLOT_SIZE     4096
+#define VCHIQ_MAX_MSG_SIZE  (VCHIQ_SLOT_SIZE - sizeof(VCHIQ_HEADER_T))
+#define VCHIQ_CHANNEL_SIZE  VCHIQ_MAX_MSG_SIZE /* For backwards compatibility */
+
+#define VCHIQ_MAKE_FOURCC(x0, x1, x2, x3) \
+                       (((x0) << 24) | ((x1) << 16) | ((x2) << 8) | (x3))
+#define VCHIQ_GET_SERVICE_USERDATA(service) vchiq_get_service_userdata(service)
+#define VCHIQ_GET_SERVICE_FOURCC(service)   vchiq_get_service_fourcc(service)
+
+typedef enum {
+       VCHIQ_SERVICE_OPENED,         /* service, -, -             */
+       VCHIQ_SERVICE_CLOSED,         /* service, -, -             */
+       VCHIQ_MESSAGE_AVAILABLE,      /* service, header, -        */
+       VCHIQ_BULK_TRANSMIT_DONE,     /* service, -, bulk_userdata */
+       VCHIQ_BULK_RECEIVE_DONE,      /* service, -, bulk_userdata */
+       VCHIQ_BULK_TRANSMIT_ABORTED,  /* service, -, bulk_userdata */
+       VCHIQ_BULK_RECEIVE_ABORTED    /* service, -, bulk_userdata */
+} VCHIQ_REASON_T;
+
+typedef enum {
+       VCHIQ_ERROR   = -1,
+       VCHIQ_SUCCESS = 0,
+       VCHIQ_RETRY   = 1
+} VCHIQ_STATUS_T;
+
+typedef enum {
+       VCHIQ_BULK_MODE_CALLBACK,
+       VCHIQ_BULK_MODE_BLOCKING,
+       VCHIQ_BULK_MODE_NOCALLBACK,
+       VCHIQ_BULK_MODE_WAITING         /* Reserved for internal use */
+} VCHIQ_BULK_MODE_T;
+
+typedef enum {
+       VCHIQ_SERVICE_OPTION_AUTOCLOSE,
+       VCHIQ_SERVICE_OPTION_SLOT_QUOTA,
+       VCHIQ_SERVICE_OPTION_MESSAGE_QUOTA,
+       VCHIQ_SERVICE_OPTION_SYNCHRONOUS
+} VCHIQ_SERVICE_OPTION_T;
+
+typedef struct vchiq_header_struct {
+       /* The message identifier - opaque to applications. */
+       int msgid;
+
+       /* Size of message data. */
+       unsigned int size;
+
+       char data[0];           /* message */
+} VCHIQ_HEADER_T;
+
+typedef struct {
+       const void *data;
+       unsigned int size;
+} VCHIQ_ELEMENT_T;
+
+typedef unsigned int VCHIQ_SERVICE_HANDLE_T;
+
+typedef VCHIQ_STATUS_T (*VCHIQ_CALLBACK_T)(VCHIQ_REASON_T, VCHIQ_HEADER_T *,
+       VCHIQ_SERVICE_HANDLE_T, void *);
+
+typedef struct vchiq_service_base_struct {
+       int fourcc;
+       VCHIQ_CALLBACK_T callback;
+       void *userdata;
+} VCHIQ_SERVICE_BASE_T;
+
+typedef struct vchiq_service_params_struct {
+       int fourcc;
+       VCHIQ_CALLBACK_T callback;
+       void *userdata;
+       short version;       /* Increment for non-trivial changes */
+       short version_min;   /* Update for incompatible changes */
+} VCHIQ_SERVICE_PARAMS_T;
+
+typedef struct vchiq_config_struct {
+       unsigned int max_msg_size;
+       unsigned int bulk_threshold; /* The message size above which it
+                                       is better to use a bulk transfer
+                                       (<= max_msg_size) */
+       unsigned int max_outstanding_bulks;
+       unsigned int max_services;
+       short version;      /* The version of VCHIQ */
+       short version_min;  /* The minimum compatible version of VCHIQ */
+} VCHIQ_CONFIG_T;
+
+typedef struct vchiq_instance_struct *VCHIQ_INSTANCE_T;
+typedef void (*VCHIQ_REMOTE_USE_CALLBACK_T)(void *cb_arg);
+
+extern VCHIQ_STATUS_T vchiq_initialise(VCHIQ_INSTANCE_T *pinstance);
+extern VCHIQ_STATUS_T vchiq_shutdown(VCHIQ_INSTANCE_T instance);
+extern VCHIQ_STATUS_T vchiq_connect(VCHIQ_INSTANCE_T instance);
+extern VCHIQ_STATUS_T vchiq_add_service(VCHIQ_INSTANCE_T instance,
+       const VCHIQ_SERVICE_PARAMS_T *params,
+       VCHIQ_SERVICE_HANDLE_T *pservice);
+extern VCHIQ_STATUS_T vchiq_open_service(VCHIQ_INSTANCE_T instance,
+       const VCHIQ_SERVICE_PARAMS_T *params,
+       VCHIQ_SERVICE_HANDLE_T *pservice);
+extern VCHIQ_STATUS_T vchiq_close_service(VCHIQ_SERVICE_HANDLE_T service);
+extern VCHIQ_STATUS_T vchiq_remove_service(VCHIQ_SERVICE_HANDLE_T service);
+extern VCHIQ_STATUS_T vchiq_use_service(VCHIQ_SERVICE_HANDLE_T service);
+extern VCHIQ_STATUS_T vchiq_use_service_no_resume(
+       VCHIQ_SERVICE_HANDLE_T service);
+extern VCHIQ_STATUS_T vchiq_release_service(VCHIQ_SERVICE_HANDLE_T service);
+
+extern VCHIQ_STATUS_T vchiq_queue_message(VCHIQ_SERVICE_HANDLE_T service,
+       const VCHIQ_ELEMENT_T *elements, unsigned int count);
+extern void           vchiq_release_message(VCHIQ_SERVICE_HANDLE_T service,
+       VCHIQ_HEADER_T *header);
+extern VCHIQ_STATUS_T vchiq_queue_bulk_transmit(VCHIQ_SERVICE_HANDLE_T service,
+       const void *data, unsigned int size, void *userdata);
+extern VCHIQ_STATUS_T vchiq_queue_bulk_receive(VCHIQ_SERVICE_HANDLE_T service,
+       void *data, unsigned int size, void *userdata);
+extern VCHIQ_STATUS_T vchiq_queue_bulk_transmit_handle(
+       VCHIQ_SERVICE_HANDLE_T service, VCHI_MEM_HANDLE_T handle,
+       const void *offset, unsigned int size, void *userdata);
+extern VCHIQ_STATUS_T vchiq_queue_bulk_receive_handle(
+       VCHIQ_SERVICE_HANDLE_T service, VCHI_MEM_HANDLE_T handle,
+       void *offset, unsigned int size, void *userdata);
+extern VCHIQ_STATUS_T vchiq_bulk_transmit(VCHIQ_SERVICE_HANDLE_T service,
+       const void *data, unsigned int size, void *userdata,
+       VCHIQ_BULK_MODE_T mode);
+extern VCHIQ_STATUS_T vchiq_bulk_receive(VCHIQ_SERVICE_HANDLE_T service,
+       void *data, unsigned int size, void *userdata,
+       VCHIQ_BULK_MODE_T mode);
+extern VCHIQ_STATUS_T vchiq_bulk_transmit_handle(VCHIQ_SERVICE_HANDLE_T service,
+       VCHI_MEM_HANDLE_T handle, const void *offset, unsigned int size,
+       void *userdata, VCHIQ_BULK_MODE_T mode);
+extern VCHIQ_STATUS_T vchiq_bulk_receive_handle(VCHIQ_SERVICE_HANDLE_T service,
+       VCHI_MEM_HANDLE_T handle, void *offset, unsigned int size,
+       void *userdata, VCHIQ_BULK_MODE_T mode);
+extern int   vchiq_get_client_id(VCHIQ_SERVICE_HANDLE_T service);
+extern void *vchiq_get_service_userdata(VCHIQ_SERVICE_HANDLE_T service);
+extern int   vchiq_get_service_fourcc(VCHIQ_SERVICE_HANDLE_T service);
+extern VCHIQ_STATUS_T vchiq_get_config(VCHIQ_INSTANCE_T instance,
+       int config_size, VCHIQ_CONFIG_T *pconfig);
+extern VCHIQ_STATUS_T vchiq_set_service_option(VCHIQ_SERVICE_HANDLE_T service,
+       VCHIQ_SERVICE_OPTION_T option, int value);
+
+extern VCHIQ_STATUS_T vchiq_remote_use(VCHIQ_INSTANCE_T instance,
+       VCHIQ_REMOTE_USE_CALLBACK_T callback, void *cb_arg);
+extern VCHIQ_STATUS_T vchiq_remote_release(VCHIQ_INSTANCE_T instance);
+
+extern VCHIQ_STATUS_T vchiq_dump_phys_mem(VCHIQ_SERVICE_HANDLE_T service,
+       void *ptr, size_t num_bytes);
+
+extern VCHIQ_STATUS_T vchiq_get_peer_version(VCHIQ_SERVICE_HANDLE_T handle,
+      short *peer_version);
+
+#endif /* VCHIQ_IF_H */
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_ioctl.h
@@ -0,0 +1,129 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHIQ_IOCTLS_H
+#define VCHIQ_IOCTLS_H
+
+#include <linux/ioctl.h>
+#include "vchiq_if.h"
+
+#define VCHIQ_IOC_MAGIC 0xc4
+#define VCHIQ_INVALID_HANDLE (~0)
+
+typedef struct {
+       VCHIQ_SERVICE_PARAMS_T params;
+       int is_open;
+       int is_vchi;
+       unsigned int handle;       /* OUT */
+} VCHIQ_CREATE_SERVICE_T;
+
+typedef struct {
+       unsigned int handle;
+       unsigned int count;
+       const VCHIQ_ELEMENT_T *elements;
+} VCHIQ_QUEUE_MESSAGE_T;
+
+typedef struct {
+       unsigned int handle;
+       void *data;
+       unsigned int size;
+       void *userdata;
+       VCHIQ_BULK_MODE_T mode;
+} VCHIQ_QUEUE_BULK_TRANSFER_T;
+
+typedef struct {
+       VCHIQ_REASON_T reason;
+       VCHIQ_HEADER_T *header;
+       void *service_userdata;
+       void *bulk_userdata;
+} VCHIQ_COMPLETION_DATA_T;
+
+typedef struct {
+       unsigned int count;
+       VCHIQ_COMPLETION_DATA_T *buf;
+       unsigned int msgbufsize;
+       unsigned int msgbufcount; /* IN/OUT */
+       void **msgbufs;
+} VCHIQ_AWAIT_COMPLETION_T;
+
+typedef struct {
+       unsigned int handle;
+       int blocking;
+       unsigned int bufsize;
+       void *buf;
+} VCHIQ_DEQUEUE_MESSAGE_T;
+
+typedef struct {
+       unsigned int config_size;
+       VCHIQ_CONFIG_T *pconfig;
+} VCHIQ_GET_CONFIG_T;
+
+typedef struct {
+       unsigned int handle;
+       VCHIQ_SERVICE_OPTION_T option;
+       int value;
+} VCHIQ_SET_SERVICE_OPTION_T;
+
+typedef struct {
+       void     *virt_addr;
+       size_t    num_bytes;
+} VCHIQ_DUMP_MEM_T;
+
+#define VCHIQ_IOC_CONNECT              _IO(VCHIQ_IOC_MAGIC,   0)
+#define VCHIQ_IOC_SHUTDOWN             _IO(VCHIQ_IOC_MAGIC,   1)
+#define VCHIQ_IOC_CREATE_SERVICE \
+       _IOWR(VCHIQ_IOC_MAGIC, 2, VCHIQ_CREATE_SERVICE_T)
+#define VCHIQ_IOC_REMOVE_SERVICE       _IO(VCHIQ_IOC_MAGIC,   3)
+#define VCHIQ_IOC_QUEUE_MESSAGE \
+       _IOW(VCHIQ_IOC_MAGIC,  4, VCHIQ_QUEUE_MESSAGE_T)
+#define VCHIQ_IOC_QUEUE_BULK_TRANSMIT \
+       _IOWR(VCHIQ_IOC_MAGIC, 5, VCHIQ_QUEUE_BULK_TRANSFER_T)
+#define VCHIQ_IOC_QUEUE_BULK_RECEIVE \
+       _IOWR(VCHIQ_IOC_MAGIC, 6, VCHIQ_QUEUE_BULK_TRANSFER_T)
+#define VCHIQ_IOC_AWAIT_COMPLETION \
+       _IOWR(VCHIQ_IOC_MAGIC, 7, VCHIQ_AWAIT_COMPLETION_T)
+#define VCHIQ_IOC_DEQUEUE_MESSAGE \
+       _IOWR(VCHIQ_IOC_MAGIC, 8, VCHIQ_DEQUEUE_MESSAGE_T)
+#define VCHIQ_IOC_GET_CLIENT_ID        _IO(VCHIQ_IOC_MAGIC,   9)
+#define VCHIQ_IOC_GET_CONFIG \
+       _IOWR(VCHIQ_IOC_MAGIC, 10, VCHIQ_GET_CONFIG_T)
+#define VCHIQ_IOC_CLOSE_SERVICE        _IO(VCHIQ_IOC_MAGIC,   11)
+#define VCHIQ_IOC_USE_SERVICE          _IO(VCHIQ_IOC_MAGIC,   12)
+#define VCHIQ_IOC_RELEASE_SERVICE      _IO(VCHIQ_IOC_MAGIC,   13)
+#define VCHIQ_IOC_SET_SERVICE_OPTION \
+       _IOW(VCHIQ_IOC_MAGIC,  14, VCHIQ_SET_SERVICE_OPTION_T)
+#define VCHIQ_IOC_DUMP_PHYS_MEM \
+       _IOW(VCHIQ_IOC_MAGIC,  15, VCHIQ_DUMP_MEM_T)
+#define VCHIQ_IOC_MAX                  15
+
+#endif
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_kern_lib.c
@@ -0,0 +1,456 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* ---- Include Files ---------------------------------------------------- */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+
+#include "vchiq_core.h"
+#include "vchiq_arm.h"
+
+/* ---- Public Variables ------------------------------------------------- */
+
+/* ---- Private Constants and Types -------------------------------------- */
+
+struct bulk_waiter_node {
+       struct bulk_waiter bulk_waiter;
+       int pid;
+       struct list_head list;
+};
+
+struct vchiq_instance_struct {
+       VCHIQ_STATE_T *state;
+
+       int connected;
+
+       struct list_head bulk_waiter_list;
+       struct mutex bulk_waiter_list_mutex;
+};
+
+static VCHIQ_STATUS_T
+vchiq_blocking_bulk_transfer(VCHIQ_SERVICE_HANDLE_T handle, void *data,
+       unsigned int size, VCHIQ_BULK_DIR_T dir);
+
+/****************************************************************************
+*
+*   vchiq_initialise
+*
+***************************************************************************/
+#define VCHIQ_INIT_RETRIES 10
+VCHIQ_STATUS_T vchiq_initialise(VCHIQ_INSTANCE_T *instanceOut)
+{
+       VCHIQ_STATUS_T status = VCHIQ_ERROR;
+       VCHIQ_STATE_T *state;
+       VCHIQ_INSTANCE_T instance = NULL;
+        int i;
+
+       vchiq_log_trace(vchiq_core_log_level, "%s called", __func__);
+
+        /* VideoCore may not be ready due to boot up timing.
+           It may never be ready if kernel and firmware are mismatched, so don't block forever. */
+        for (i=0; i<VCHIQ_INIT_RETRIES; i++) {
+               state = vchiq_get_state();
+               if (state)
+                       break;
+               udelay(500);
+       }
+       if (i==VCHIQ_INIT_RETRIES) {
+               vchiq_log_error(vchiq_core_log_level,
+                       "%s: videocore not initialized\n", __func__);
+               goto failed;
+       } else if (i>0) {
+               vchiq_log_warning(vchiq_core_log_level,
+                       "%s: videocore initialized after %d retries\n", __func__, i);
+       }
+
+       instance = kzalloc(sizeof(*instance), GFP_KERNEL);
+       if (!instance) {
+               vchiq_log_error(vchiq_core_log_level,
+                       "%s: error allocating vchiq instance\n", __func__);
+               goto failed;
+       }
+
+       instance->connected = 0;
+       instance->state = state;
+       mutex_init(&instance->bulk_waiter_list_mutex);
+       INIT_LIST_HEAD(&instance->bulk_waiter_list);
+
+       *instanceOut = instance;
+
+       status = VCHIQ_SUCCESS;
+
+failed:
+       vchiq_log_trace(vchiq_core_log_level,
+               "%s(%p): returning %d", __func__, instance, status);
+
+       return status;
+}
+EXPORT_SYMBOL(vchiq_initialise);
+
+/****************************************************************************
+*
+*   vchiq_shutdown
+*
+***************************************************************************/
+
+VCHIQ_STATUS_T vchiq_shutdown(VCHIQ_INSTANCE_T instance)
+{
+       VCHIQ_STATUS_T status;
+       VCHIQ_STATE_T *state = instance->state;
+
+       vchiq_log_trace(vchiq_core_log_level,
+               "%s(%p) called", __func__, instance);
+
+       if (mutex_lock_interruptible(&state->mutex) != 0)
+               return VCHIQ_RETRY;
+
+       /* Remove all services */
+       status = vchiq_shutdown_internal(state, instance);
+
+       mutex_unlock(&state->mutex);
+
+       vchiq_log_trace(vchiq_core_log_level,
+               "%s(%p): returning %d", __func__, instance, status);
+
+       if (status == VCHIQ_SUCCESS) {
+               struct list_head *pos, *next;
+               list_for_each_safe(pos, next,
+                               &instance->bulk_waiter_list) {
+                       struct bulk_waiter_node *waiter;
+                       waiter = list_entry(pos,
+                                       struct bulk_waiter_node,
+                                       list);
+                       list_del(pos);
+                       vchiq_log_info(vchiq_arm_log_level,
+                                       "bulk_waiter - cleaned up %x "
+                                       "for pid %d",
+                                       (unsigned int)waiter, waiter->pid);
+                       kfree(waiter);
+               }
+               kfree(instance);
+       }
+
+       return status;
+}
+EXPORT_SYMBOL(vchiq_shutdown);
+
+/****************************************************************************
+*
+*   vchiq_is_connected
+*
+***************************************************************************/
+
+int vchiq_is_connected(VCHIQ_INSTANCE_T instance)
+{
+       return instance->connected;
+}
+
+/****************************************************************************
+*
+*   vchiq_connect
+*
+***************************************************************************/
+
+VCHIQ_STATUS_T vchiq_connect(VCHIQ_INSTANCE_T instance)
+{
+       VCHIQ_STATUS_T status;
+       VCHIQ_STATE_T *state = instance->state;
+
+       vchiq_log_trace(vchiq_core_log_level,
+               "%s(%p) called", __func__, instance);
+
+       if (mutex_lock_interruptible(&state->mutex) != 0) {
+               vchiq_log_trace(vchiq_core_log_level,
+                       "%s: call to mutex_lock failed", __func__);
+               status = VCHIQ_RETRY;
+               goto failed;
+       }
+       status = vchiq_connect_internal(state, instance);
+
+       if (status == VCHIQ_SUCCESS)
+               instance->connected = 1;
+
+       mutex_unlock(&state->mutex);
+
+failed:
+       vchiq_log_trace(vchiq_core_log_level,
+               "%s(%p): returning %d", __func__, instance, status);
+
+       return status;
+}
+EXPORT_SYMBOL(vchiq_connect);
+
+/****************************************************************************
+*
+*   vchiq_add_service
+*
+***************************************************************************/
+
+VCHIQ_STATUS_T vchiq_add_service(
+       VCHIQ_INSTANCE_T              instance,
+       const VCHIQ_SERVICE_PARAMS_T *params,
+       VCHIQ_SERVICE_HANDLE_T       *phandle)
+{
+       VCHIQ_STATUS_T status;
+       VCHIQ_STATE_T *state = instance->state;
+       VCHIQ_SERVICE_T *service = NULL;
+       int srvstate;
+
+       vchiq_log_trace(vchiq_core_log_level,
+               "%s(%p) called", __func__, instance);
+
+       *phandle = VCHIQ_SERVICE_HANDLE_INVALID;
+
+       srvstate = vchiq_is_connected(instance)
+               ? VCHIQ_SRVSTATE_LISTENING
+               : VCHIQ_SRVSTATE_HIDDEN;
+
+       service = vchiq_add_service_internal(
+               state,
+               params,
+               srvstate,
+               instance,
+               NULL);
+
+       if (service) {
+               *phandle = service->handle;
+               status = VCHIQ_SUCCESS;
+       } else
+               status = VCHIQ_ERROR;
+
+       vchiq_log_trace(vchiq_core_log_level,
+               "%s(%p): returning %d", __func__, instance, status);
+
+       return status;
+}
+EXPORT_SYMBOL(vchiq_add_service);
+
+/****************************************************************************
+*
+*   vchiq_open_service
+*
+***************************************************************************/
+
+VCHIQ_STATUS_T vchiq_open_service(
+       VCHIQ_INSTANCE_T              instance,
+       const VCHIQ_SERVICE_PARAMS_T *params,
+       VCHIQ_SERVICE_HANDLE_T       *phandle)
+{
+       VCHIQ_STATUS_T   status = VCHIQ_ERROR;
+       VCHIQ_STATE_T   *state = instance->state;
+       VCHIQ_SERVICE_T *service = NULL;
+
+       vchiq_log_trace(vchiq_core_log_level,
+               "%s(%p) called", __func__, instance);
+
+       *phandle = VCHIQ_SERVICE_HANDLE_INVALID;
+
+       if (!vchiq_is_connected(instance))
+               goto failed;
+
+       service = vchiq_add_service_internal(state,
+               params,
+               VCHIQ_SRVSTATE_OPENING,
+               instance,
+               NULL);
+
+       if (service) {
+               status = vchiq_open_service_internal(service, current->pid);
+               if (status == VCHIQ_SUCCESS)
+                       *phandle = service->handle;
+               else
+                       vchiq_remove_service(service->handle);
+       }
+
+failed:
+       vchiq_log_trace(vchiq_core_log_level,
+               "%s(%p): returning %d", __func__, instance, status);
+
+       return status;
+}
+EXPORT_SYMBOL(vchiq_open_service);
+
+VCHIQ_STATUS_T
+vchiq_queue_bulk_transmit(VCHIQ_SERVICE_HANDLE_T handle,
+       const void *data, unsigned int size, void *userdata)
+{
+       return vchiq_bulk_transfer(handle,
+               VCHI_MEM_HANDLE_INVALID, (void *)data, size, userdata,
+               VCHIQ_BULK_MODE_CALLBACK, VCHIQ_BULK_TRANSMIT);
+}
+EXPORT_SYMBOL(vchiq_queue_bulk_transmit);
+
+VCHIQ_STATUS_T
+vchiq_queue_bulk_receive(VCHIQ_SERVICE_HANDLE_T handle, void *data,
+       unsigned int size, void *userdata)
+{
+       return vchiq_bulk_transfer(handle,
+               VCHI_MEM_HANDLE_INVALID, data, size, userdata,
+               VCHIQ_BULK_MODE_CALLBACK, VCHIQ_BULK_RECEIVE);
+}
+EXPORT_SYMBOL(vchiq_queue_bulk_receive);
+
+VCHIQ_STATUS_T
+vchiq_bulk_transmit(VCHIQ_SERVICE_HANDLE_T handle, const void *data,
+       unsigned int size, void *userdata, VCHIQ_BULK_MODE_T mode)
+{
+       VCHIQ_STATUS_T status;
+
+       switch (mode) {
+       case VCHIQ_BULK_MODE_NOCALLBACK:
+       case VCHIQ_BULK_MODE_CALLBACK:
+               status = vchiq_bulk_transfer(handle,
+                       VCHI_MEM_HANDLE_INVALID, (void *)data, size, userdata,
+                       mode, VCHIQ_BULK_TRANSMIT);
+               break;
+       case VCHIQ_BULK_MODE_BLOCKING:
+               status = vchiq_blocking_bulk_transfer(handle,
+                       (void *)data, size, VCHIQ_BULK_TRANSMIT);
+               break;
+       default:
+               return VCHIQ_ERROR;
+       }
+
+       return status;
+}
+EXPORT_SYMBOL(vchiq_bulk_transmit);
+
+VCHIQ_STATUS_T
+vchiq_bulk_receive(VCHIQ_SERVICE_HANDLE_T handle, void *data,
+       unsigned int size, void *userdata, VCHIQ_BULK_MODE_T mode)
+{
+       VCHIQ_STATUS_T status;
+
+       switch (mode) {
+       case VCHIQ_BULK_MODE_NOCALLBACK:
+       case VCHIQ_BULK_MODE_CALLBACK:
+               status = vchiq_bulk_transfer(handle,
+                       VCHI_MEM_HANDLE_INVALID, data, size, userdata,
+                       mode, VCHIQ_BULK_RECEIVE);
+               break;
+       case VCHIQ_BULK_MODE_BLOCKING:
+               status = vchiq_blocking_bulk_transfer(handle,
+                       (void *)data, size, VCHIQ_BULK_RECEIVE);
+               break;
+       default:
+               return VCHIQ_ERROR;
+       }
+
+       return status;
+}
+EXPORT_SYMBOL(vchiq_bulk_receive);
+
+static VCHIQ_STATUS_T
+vchiq_blocking_bulk_transfer(VCHIQ_SERVICE_HANDLE_T handle, void *data,
+       unsigned int size, VCHIQ_BULK_DIR_T dir)
+{
+       VCHIQ_INSTANCE_T instance;
+       VCHIQ_SERVICE_T *service;
+       VCHIQ_STATUS_T status;
+       struct bulk_waiter_node *waiter = NULL;
+       struct list_head *pos;
+
+       service = find_service_by_handle(handle);
+       if (!service)
+               return VCHIQ_ERROR;
+
+       instance = service->instance;
+
+       unlock_service(service);
+
+       mutex_lock(&instance->bulk_waiter_list_mutex);
+       list_for_each(pos, &instance->bulk_waiter_list) {
+               if (list_entry(pos, struct bulk_waiter_node,
+                               list)->pid == current->pid) {
+                       waiter = list_entry(pos,
+                               struct bulk_waiter_node,
+                               list);
+                       list_del(pos);
+                       break;
+               }
+       }
+       mutex_unlock(&instance->bulk_waiter_list_mutex);
+
+       if (waiter) {
+               VCHIQ_BULK_T *bulk = waiter->bulk_waiter.bulk;
+               if (bulk) {
+                       /* This thread has an outstanding bulk transfer. */
+                       if ((bulk->data != data) ||
+                               (bulk->size != size)) {
+                               /* This is not a retry of the previous one.
+                               ** Cancel the signal when the transfer
+                               ** completes. */
+                               spin_lock(&bulk_waiter_spinlock);
+                               bulk->userdata = NULL;
+                               spin_unlock(&bulk_waiter_spinlock);
+                       }
+               }
+       }
+
+       if (!waiter) {
+               waiter = kzalloc(sizeof(struct bulk_waiter_node), GFP_KERNEL);
+               if (!waiter) {
+                       vchiq_log_error(vchiq_core_log_level,
+                               "%s - out of memory", __func__);
+                       return VCHIQ_ERROR;
+               }
+       }
+
+       status = vchiq_bulk_transfer(handle, VCHI_MEM_HANDLE_INVALID,
+               data, size, &waiter->bulk_waiter, VCHIQ_BULK_MODE_BLOCKING,
+               dir);
+       if ((status != VCHIQ_RETRY) || fatal_signal_pending(current) ||
+               !waiter->bulk_waiter.bulk) {
+               VCHIQ_BULK_T *bulk = waiter->bulk_waiter.bulk;
+               if (bulk) {
+                       /* Cancel the signal when the transfer
+                        ** completes. */
+                       spin_lock(&bulk_waiter_spinlock);
+                       bulk->userdata = NULL;
+                       spin_unlock(&bulk_waiter_spinlock);
+               }
+               kfree(waiter);
+       } else {
+               waiter->pid = current->pid;
+               mutex_lock(&instance->bulk_waiter_list_mutex);
+               list_add(&waiter->list, &instance->bulk_waiter_list);
+               mutex_unlock(&instance->bulk_waiter_list_mutex);
+               vchiq_log_info(vchiq_arm_log_level,
+                               "saved bulk_waiter %x for pid %d",
+                               (unsigned int)waiter, current->pid);
+       }
+
+       return status;
+}
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_memdrv.h
@@ -0,0 +1,71 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHIQ_MEMDRV_H
+#define VCHIQ_MEMDRV_H
+
+/* ---- Include Files ----------------------------------------------------- */
+
+#include <linux/kernel.h>
+#include "vchiq_if.h"
+
+/* ---- Constants and Types ---------------------------------------------- */
+
+typedef struct {
+        void                   *armSharedMemVirt;
+        dma_addr_t              armSharedMemPhys;
+        size_t                  armSharedMemSize;
+
+        void                   *vcSharedMemVirt;
+        dma_addr_t              vcSharedMemPhys;
+        size_t                  vcSharedMemSize;
+} VCHIQ_SHARED_MEM_INFO_T;
+
+/* ---- Variable Externs ------------------------------------------------- */
+
+/* ---- Function Prototypes ---------------------------------------------- */
+
+void vchiq_get_shared_mem_info(VCHIQ_SHARED_MEM_INFO_T *info);
+
+VCHIQ_STATUS_T vchiq_memdrv_initialise(void);
+
+VCHIQ_STATUS_T vchiq_userdrv_create_instance(
+       const VCHIQ_PLATFORM_DATA_T * platform_data);
+
+VCHIQ_STATUS_T vchiq_userdrv_suspend(
+       const VCHIQ_PLATFORM_DATA_T * platform_data);
+
+VCHIQ_STATUS_T vchiq_userdrv_resume(
+       const VCHIQ_PLATFORM_DATA_T * platform_data);
+
+#endif
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_pagelist.h
@@ -0,0 +1,58 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHIQ_PAGELIST_H
+#define VCHIQ_PAGELIST_H
+
+#ifndef PAGE_SIZE
+#define PAGE_SIZE 4096
+#endif
+#define CACHE_LINE_SIZE 32
+#define PAGELIST_WRITE 0
+#define PAGELIST_READ 1
+#define PAGELIST_READ_WITH_FRAGMENTS 2
+
+typedef struct pagelist_struct {
+       unsigned long length;
+       unsigned short type;
+       unsigned short offset;
+       unsigned long addrs[1]; /* N.B. 12 LSBs hold the number of following
+                                  pages at consecutive addresses. */
+} PAGELIST_T;
+
+typedef struct fragments_struct {
+       char headbuf[CACHE_LINE_SIZE];
+       char tailbuf[CACHE_LINE_SIZE];
+} FRAGMENTS_T;
+
+#endif /* VCHIQ_PAGELIST_H */
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_proc.c
@@ -0,0 +1,253 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+
+#include <linux/proc_fs.h>
+#include "vchiq_core.h"
+#include "vchiq_arm.h"
+
+#if 1
+
+int vchiq_proc_init(void)
+{
+       return 0;
+}
+
+void vchiq_proc_deinit(void)
+{
+}
+
+#else
+
+struct vchiq_proc_info {
+       /* Global 'vc' proc entry used by all instances */
+       struct proc_dir_entry *vc_cfg_dir;
+
+       /* one entry per client process */
+       struct proc_dir_entry *clients;
+
+       /* log categories */
+       struct proc_dir_entry *log_categories;
+};
+
+static struct vchiq_proc_info proc_info;
+
+struct proc_dir_entry *vchiq_proc_top(void)
+{
+       BUG_ON(proc_info.vc_cfg_dir == NULL);
+       return proc_info.vc_cfg_dir;
+}
+
+/****************************************************************************
+*
+*   log category entries
+*
+***************************************************************************/
+#define PROC_WRITE_BUF_SIZE 256
+
+#define VCHIQ_LOG_ERROR_STR   "error"
+#define VCHIQ_LOG_WARNING_STR "warning"
+#define VCHIQ_LOG_INFO_STR    "info"
+#define VCHIQ_LOG_TRACE_STR   "trace"
+
+static int log_cfg_read(char *buffer,
+       char **start,
+       off_t off,
+       int count,
+       int *eof,
+       void *data)
+{
+       int len = 0;
+       char *log_value = NULL;
+
+       switch (*((int *)data)) {
+       case VCHIQ_LOG_ERROR:
+               log_value = VCHIQ_LOG_ERROR_STR;
+               break;
+       case VCHIQ_LOG_WARNING:
+               log_value = VCHIQ_LOG_WARNING_STR;
+               break;
+       case VCHIQ_LOG_INFO:
+               log_value = VCHIQ_LOG_INFO_STR;
+               break;
+       case VCHIQ_LOG_TRACE:
+               log_value = VCHIQ_LOG_TRACE_STR;
+               break;
+       default:
+               break;
+       }
+
+       len += sprintf(buffer + len,
+               "%s\n",
+               log_value ? log_value : "(null)");
+
+       return len;
+}
+
+
+static int log_cfg_write(struct file *file,
+       const char __user *buffer,
+       unsigned long count,
+       void *data)
+{
+       int *log_module = data;
+       char kbuf[PROC_WRITE_BUF_SIZE + 1];
+
+       (void)file;
+
+       memset(kbuf, 0, PROC_WRITE_BUF_SIZE + 1);
+       if (count >= PROC_WRITE_BUF_SIZE)
+               count = PROC_WRITE_BUF_SIZE;
+
+       if (copy_from_user(kbuf,
+               buffer,
+               count) != 0)
+               return -EFAULT;
+       kbuf[count - 1] = 0;
+
+       if (strncmp("error", kbuf, strlen("error")) == 0)
+               *log_module = VCHIQ_LOG_ERROR;
+       else if (strncmp("warning", kbuf, strlen("warning")) == 0)
+               *log_module = VCHIQ_LOG_WARNING;
+       else if (strncmp("info", kbuf, strlen("info")) == 0)
+               *log_module = VCHIQ_LOG_INFO;
+       else if (strncmp("trace", kbuf, strlen("trace")) == 0)
+               *log_module = VCHIQ_LOG_TRACE;
+       else
+               *log_module = VCHIQ_LOG_DEFAULT;
+
+       return count;
+}
+
+/* Log category proc entries */
+struct vchiq_proc_log_entry {
+       const char *name;
+       int *plevel;
+       struct proc_dir_entry *dir;
+};
+
+static struct vchiq_proc_log_entry vchiq_proc_log_entries[] = {
+       { "core", &vchiq_core_log_level },
+       { "msg",  &vchiq_core_msg_log_level },
+       { "sync", &vchiq_sync_log_level },
+       { "susp", &vchiq_susp_log_level },
+       { "arm",  &vchiq_arm_log_level },
+};
+static int n_log_entries =
+       sizeof(vchiq_proc_log_entries)/sizeof(vchiq_proc_log_entries[0]);
+
+/* create an entry under /proc/vc/log for each log category */
+static int vchiq_proc_create_log_entries(struct proc_dir_entry *top)
+{
+       struct proc_dir_entry *dir;
+       size_t i;
+       int ret = 0;
+       dir = proc_mkdir("log", proc_info.vc_cfg_dir);
+       if (!dir)
+               return -ENOMEM;
+       proc_info.log_categories = dir;
+
+       for (i = 0; i < n_log_entries; i++) {
+               dir = create_proc_entry(vchiq_proc_log_entries[i].name,
+                                       0644,
+                                       proc_info.log_categories);
+               if (!dir) {
+                       ret = -ENOMEM;
+                       break;
+               }
+
+               dir->read_proc = &log_cfg_read;
+               dir->write_proc = &log_cfg_write;
+               dir->data = (void *)vchiq_proc_log_entries[i].plevel;
+
+               vchiq_proc_log_entries[i].dir = dir;
+       }
+       return ret;
+}
+
+
+int vchiq_proc_init(void)
+{
+       BUG_ON(proc_info.vc_cfg_dir != NULL);
+
+       proc_info.vc_cfg_dir = proc_mkdir("vc", NULL);
+       if (proc_info.vc_cfg_dir == NULL)
+               goto fail;
+
+       proc_info.clients = proc_mkdir("clients",
+                               proc_info.vc_cfg_dir);
+       if (!proc_info.clients)
+               goto fail;
+
+       if (vchiq_proc_create_log_entries(proc_info.vc_cfg_dir) != 0)
+               goto fail;
+
+       return 0;
+
+fail:
+       vchiq_proc_deinit();
+       vchiq_log_error(vchiq_arm_log_level,
+               "%s: failed to create proc directory",
+               __func__);
+
+       return -ENOMEM;
+}
+
+/* remove all the proc entries */
+void vchiq_proc_deinit(void)
+{
+       /* log category entries */
+       if (proc_info.log_categories) {
+               size_t i;
+               for (i = 0; i < n_log_entries; i++)
+                       if (vchiq_proc_log_entries[i].dir)
+                               remove_proc_entry(
+                                       vchiq_proc_log_entries[i].name,
+                                       proc_info.log_categories);
+
+               remove_proc_entry(proc_info.log_categories->name,
+                                 proc_info.vc_cfg_dir);
+       }
+       if (proc_info.clients)
+               remove_proc_entry(proc_info.clients->name,
+                                 proc_info.vc_cfg_dir);
+       if (proc_info.vc_cfg_dir)
+               remove_proc_entry(proc_info.vc_cfg_dir->name, NULL);
+}
+
+struct proc_dir_entry *vchiq_clients_top(void)
+{
+       return proc_info.clients;
+}
+
+#endif
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_shim.c
@@ -0,0 +1,828 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <linux/module.h>
+#include <linux/types.h>
+
+#include "interface/vchi/vchi.h"
+#include "vchiq.h"
+#include "vchiq_core.h"
+
+#include "vchiq_util.h"
+
+#include <stddef.h>
+
+#define vchiq_status_to_vchi(status) ((int32_t)status)
+
+typedef struct {
+       VCHIQ_SERVICE_HANDLE_T handle;
+
+       VCHIU_QUEUE_T queue;
+
+       VCHI_CALLBACK_T callback;
+       void *callback_param;
+} SHIM_SERVICE_T;
+
+/* ----------------------------------------------------------------------
+ * return pointer to the mphi message driver function table
+ * -------------------------------------------------------------------- */
+const VCHI_MESSAGE_DRIVER_T *
+vchi_mphi_message_driver_func_table(void)
+{
+       return NULL;
+}
+
+/* ----------------------------------------------------------------------
+ * return a pointer to the 'single' connection driver fops
+ * -------------------------------------------------------------------- */
+const VCHI_CONNECTION_API_T *
+single_get_func_table(void)
+{
+       return NULL;
+}
+
+VCHI_CONNECTION_T *vchi_create_connection(
+       const VCHI_CONNECTION_API_T *function_table,
+       const VCHI_MESSAGE_DRIVER_T *low_level)
+{
+       (void)function_table;
+       (void)low_level;
+       return NULL;
+}
+
+/***********************************************************
+ * Name: vchi_msg_peek
+ *
+ * Arguments:  const VCHI_SERVICE_HANDLE_T handle,
+ *             void **data,
+ *             uint32_t *msg_size,
+
+
+ *             VCHI_FLAGS_T flags
+ *
+ * Description: Routine to return a pointer to the current message (to allow in
+ *              place processing). The message can be removed using
+ *              vchi_msg_remove when you're finished
+ *
+ * Returns: int32_t - success == 0
+ *
+ ***********************************************************/
+int32_t vchi_msg_peek(VCHI_SERVICE_HANDLE_T handle,
+       void **data,
+       uint32_t *msg_size,
+       VCHI_FLAGS_T flags)
+{
+       SHIM_SERVICE_T *service = (SHIM_SERVICE_T *)handle;
+       VCHIQ_HEADER_T *header;
+
+       WARN_ON((flags != VCHI_FLAGS_NONE) &&
+               (flags != VCHI_FLAGS_BLOCK_UNTIL_OP_COMPLETE));
+
+       if (flags == VCHI_FLAGS_NONE)
+               if (vchiu_queue_is_empty(&service->queue))
+                       return -1;
+
+       header = vchiu_queue_peek(&service->queue);
+
+       *data = header->data;
+       *msg_size = header->size;
+
+       return 0;
+}
+EXPORT_SYMBOL(vchi_msg_peek);
+
+/***********************************************************
+ * Name: vchi_msg_remove
+ *
+ * Arguments:  const VCHI_SERVICE_HANDLE_T handle,
+ *
+ * Description: Routine to remove a message (after it has been read with
+ *              vchi_msg_peek)
+ *
+ * Returns: int32_t - success == 0
+ *
+ ***********************************************************/
+int32_t vchi_msg_remove(VCHI_SERVICE_HANDLE_T handle)
+{
+       SHIM_SERVICE_T *service = (SHIM_SERVICE_T *)handle;
+       VCHIQ_HEADER_T *header;
+
+       header = vchiu_queue_pop(&service->queue);
+
+       vchiq_release_message(service->handle, header);
+
+       return 0;
+}
+EXPORT_SYMBOL(vchi_msg_remove);
+
+/***********************************************************
+ * Name: vchi_msg_queue
+ *
+ * Arguments:  VCHI_SERVICE_HANDLE_T handle,
+ *             const void *data,
+ *             uint32_t data_size,
+ *             VCHI_FLAGS_T flags,
+ *             void *msg_handle,
+ *
+ * Description: Thin wrapper to queue a message onto a connection
+ *
+ * Returns: int32_t - success == 0
+ *
+ ***********************************************************/
+int32_t vchi_msg_queue(VCHI_SERVICE_HANDLE_T handle,
+       const void *data,
+       uint32_t data_size,
+       VCHI_FLAGS_T flags,
+       void *msg_handle)
+{
+       SHIM_SERVICE_T *service = (SHIM_SERVICE_T *)handle;
+       VCHIQ_ELEMENT_T element = {data, data_size};
+       VCHIQ_STATUS_T status;
+
+       (void)msg_handle;
+
+       WARN_ON(flags != VCHI_FLAGS_BLOCK_UNTIL_QUEUED);
+
+       status = vchiq_queue_message(service->handle, &element, 1);
+
+       /* vchiq_queue_message() may return VCHIQ_RETRY, so we need to
+       ** implement a retry mechanism since this function is supposed
+       ** to block until queued
+       */
+       while (status == VCHIQ_RETRY) {
+               msleep(1);
+               status = vchiq_queue_message(service->handle, &element, 1);
+       }
+
+       return vchiq_status_to_vchi(status);
+}
+EXPORT_SYMBOL(vchi_msg_queue);
+
+/***********************************************************
+ * Name: vchi_bulk_queue_receive
+ *
+ * Arguments:  VCHI_BULK_HANDLE_T handle,
+ *             void *data_dst,
+ *             const uint32_t data_size,
+ *             VCHI_FLAGS_T flags
+ *             void *bulk_handle
+ *
+ * Description: Routine to setup a rcv buffer
+ *
+ * Returns: int32_t - success == 0
+ *
+ ***********************************************************/
+int32_t vchi_bulk_queue_receive(VCHI_SERVICE_HANDLE_T handle,
+       void *data_dst,
+       uint32_t data_size,
+       VCHI_FLAGS_T flags,
+       void *bulk_handle)
+{
+       SHIM_SERVICE_T *service = (SHIM_SERVICE_T *)handle;
+       VCHIQ_BULK_MODE_T mode;
+       VCHIQ_STATUS_T status;
+
+       switch ((int)flags) {
+       case VCHI_FLAGS_CALLBACK_WHEN_OP_COMPLETE
+               | VCHI_FLAGS_BLOCK_UNTIL_QUEUED:
+               WARN_ON(!service->callback);
+               mode = VCHIQ_BULK_MODE_CALLBACK;
+               break;
+       case VCHI_FLAGS_BLOCK_UNTIL_OP_COMPLETE:
+               mode = VCHIQ_BULK_MODE_BLOCKING;
+               break;
+       case VCHI_FLAGS_BLOCK_UNTIL_QUEUED:
+       case VCHI_FLAGS_NONE:
+               mode = VCHIQ_BULK_MODE_NOCALLBACK;
+               break;
+       default:
+               WARN(1, "unsupported message\n");
+               return vchiq_status_to_vchi(VCHIQ_ERROR);
+       }
+
+       status = vchiq_bulk_receive(service->handle, data_dst, data_size,
+               bulk_handle, mode);
+
+       /* vchiq_bulk_receive() may return VCHIQ_RETRY, so we need to
+       ** implement a retry mechanism since this function is supposed
+       ** to block until queued
+       */
+       while (status == VCHIQ_RETRY) {
+               msleep(1);
+               status = vchiq_bulk_receive(service->handle, data_dst,
+                       data_size, bulk_handle, mode);
+       }
+
+       return vchiq_status_to_vchi(status);
+}
+EXPORT_SYMBOL(vchi_bulk_queue_receive);
+
+/***********************************************************
+ * Name: vchi_bulk_queue_transmit
+ *
+ * Arguments:  VCHI_BULK_HANDLE_T handle,
+ *             const void *data_src,
+ *             uint32_t data_size,
+ *             VCHI_FLAGS_T flags,
+ *             void *bulk_handle
+ *
+ * Description: Routine to transmit some data
+ *
+ * Returns: int32_t - success == 0
+ *
+ ***********************************************************/
+int32_t vchi_bulk_queue_transmit(VCHI_SERVICE_HANDLE_T handle,
+       const void *data_src,
+       uint32_t data_size,
+       VCHI_FLAGS_T flags,
+       void *bulk_handle)
+{
+       SHIM_SERVICE_T *service = (SHIM_SERVICE_T *)handle;
+       VCHIQ_BULK_MODE_T mode;
+       VCHIQ_STATUS_T status;
+
+       switch ((int)flags) {
+       case VCHI_FLAGS_CALLBACK_WHEN_OP_COMPLETE
+               | VCHI_FLAGS_BLOCK_UNTIL_QUEUED:
+               WARN_ON(!service->callback);
+               mode = VCHIQ_BULK_MODE_CALLBACK;
+               break;
+       case VCHI_FLAGS_BLOCK_UNTIL_DATA_READ:
+       case VCHI_FLAGS_BLOCK_UNTIL_OP_COMPLETE:
+               mode = VCHIQ_BULK_MODE_BLOCKING;
+               break;
+       case VCHI_FLAGS_BLOCK_UNTIL_QUEUED:
+       case VCHI_FLAGS_NONE:
+               mode = VCHIQ_BULK_MODE_NOCALLBACK;
+               break;
+       default:
+               WARN(1, "unsupported message\n");
+               return vchiq_status_to_vchi(VCHIQ_ERROR);
+       }
+
+       status = vchiq_bulk_transmit(service->handle, data_src, data_size,
+               bulk_handle, mode);
+
+       /* vchiq_bulk_transmit() may return VCHIQ_RETRY, so we need to
+       ** implement a retry mechanism since this function is supposed
+       ** to block until queued
+       */
+       while (status == VCHIQ_RETRY) {
+               msleep(1);
+               status = vchiq_bulk_transmit(service->handle, data_src,
+                       data_size, bulk_handle, mode);
+       }
+
+       return vchiq_status_to_vchi(status);
+}
+EXPORT_SYMBOL(vchi_bulk_queue_transmit);
+
+/***********************************************************
+ * Name: vchi_msg_dequeue
+ *
+ * Arguments:  VCHI_SERVICE_HANDLE_T handle,
+ *             void *data,
+ *             uint32_t max_data_size_to_read,
+ *             uint32_t *actual_msg_size
+ *             VCHI_FLAGS_T flags
+ *
+ * Description: Routine to dequeue a message into the supplied buffer
+ *
+ * Returns: int32_t - success == 0
+ *
+ ***********************************************************/
+int32_t vchi_msg_dequeue(VCHI_SERVICE_HANDLE_T handle,
+       void *data,
+       uint32_t max_data_size_to_read,
+       uint32_t *actual_msg_size,
+       VCHI_FLAGS_T flags)
+{
+       SHIM_SERVICE_T *service = (SHIM_SERVICE_T *)handle;
+       VCHIQ_HEADER_T *header;
+
+       WARN_ON((flags != VCHI_FLAGS_NONE) &&
+               (flags != VCHI_FLAGS_BLOCK_UNTIL_OP_COMPLETE));
+
+       if (flags == VCHI_FLAGS_NONE)
+               if (vchiu_queue_is_empty(&service->queue))
+                       return -1;
+
+       header = vchiu_queue_pop(&service->queue);
+
+       memcpy(data, header->data, header->size < max_data_size_to_read ?
+               header->size : max_data_size_to_read);
+
+       *actual_msg_size = header->size;
+
+       vchiq_release_message(service->handle, header);
+
+       return 0;
+}
+EXPORT_SYMBOL(vchi_msg_dequeue);
+
+/***********************************************************
+ * Name: vchi_msg_queuev
+ *
+ * Arguments:  VCHI_SERVICE_HANDLE_T handle,
+ *             VCHI_MSG_VECTOR_T *vector,
+ *             uint32_t count,
+ *             VCHI_FLAGS_T flags,
+ *             void *msg_handle
+ *
+ * Description: Thin wrapper to queue a message onto a connection
+ *
+ * Returns: int32_t - success == 0
+ *
+ ***********************************************************/
+
+vchiq_static_assert(sizeof(VCHI_MSG_VECTOR_T) == sizeof(VCHIQ_ELEMENT_T));
+vchiq_static_assert(offsetof(VCHI_MSG_VECTOR_T, vec_base) ==
+       offsetof(VCHIQ_ELEMENT_T, data));
+vchiq_static_assert(offsetof(VCHI_MSG_VECTOR_T, vec_len) ==
+       offsetof(VCHIQ_ELEMENT_T, size));
+
+int32_t vchi_msg_queuev(VCHI_SERVICE_HANDLE_T handle,
+       VCHI_MSG_VECTOR_T *vector,
+       uint32_t count,
+       VCHI_FLAGS_T flags,
+       void *msg_handle)
+{
+       SHIM_SERVICE_T *service = (SHIM_SERVICE_T *)handle;
+
+       (void)msg_handle;
+
+       WARN_ON(flags != VCHI_FLAGS_BLOCK_UNTIL_QUEUED);
+
+       return vchiq_status_to_vchi(vchiq_queue_message(service->handle,
+               (const VCHIQ_ELEMENT_T *)vector, count));
+}
+EXPORT_SYMBOL(vchi_msg_queuev);
+
+/***********************************************************
+ * Name: vchi_held_msg_release
+ *
+ * Arguments:  VCHI_HELD_MSG_T *message
+ *
+ * Description: Routine to release a held message (after it has been read with
+ *              vchi_msg_hold)
+ *
+ * Returns: int32_t - success == 0
+ *
+ ***********************************************************/
+int32_t vchi_held_msg_release(VCHI_HELD_MSG_T *message)
+{
+       vchiq_release_message((VCHIQ_SERVICE_HANDLE_T)message->service,
+               (VCHIQ_HEADER_T *)message->message);
+
+       return 0;
+}
+EXPORT_SYMBOL(vchi_held_msg_release);
+
+/***********************************************************
+ * Name: vchi_msg_hold
+ *
+ * Arguments:  VCHI_SERVICE_HANDLE_T handle,
+ *             void **data,
+ *             uint32_t *msg_size,
+ *             VCHI_FLAGS_T flags,
+ *             VCHI_HELD_MSG_T *message_handle
+ *
+ * Description: Routine to return a pointer to the current message (to allow
+ *              in place processing). The message is dequeued - don't forget
+ *              to release the message using vchi_held_msg_release when you're
+ *              finished.
+ *
+ * Returns: int32_t - success == 0
+ *
+ ***********************************************************/
+int32_t vchi_msg_hold(VCHI_SERVICE_HANDLE_T handle,
+       void **data,
+       uint32_t *msg_size,
+       VCHI_FLAGS_T flags,
+       VCHI_HELD_MSG_T *message_handle)
+{
+       SHIM_SERVICE_T *service = (SHIM_SERVICE_T *)handle;
+       VCHIQ_HEADER_T *header;
+
+       WARN_ON((flags != VCHI_FLAGS_NONE) &&
+               (flags != VCHI_FLAGS_BLOCK_UNTIL_OP_COMPLETE));
+
+       if (flags == VCHI_FLAGS_NONE)
+               if (vchiu_queue_is_empty(&service->queue))
+                       return -1;
+
+       header = vchiu_queue_pop(&service->queue);
+
+       *data = header->data;
+       *msg_size = header->size;
+
+       message_handle->service =
+               (struct opaque_vchi_service_t *)service->handle;
+       message_handle->message = header;
+
+       return 0;
+}
+EXPORT_SYMBOL(vchi_msg_hold);
+
+/***********************************************************
+ * Name: vchi_initialise
+ *
+ * Arguments: VCHI_INSTANCE_T *instance_handle
+ *            VCHI_CONNECTION_T **connections
+ *            const uint32_t num_connections
+ *
+ * Description: Initialises the hardware but does not transmit anything
+ *              When run as a Host App this will be called twice hence the need
+ *              to malloc the state information
+ *
+ * Returns: 0 if successful, failure otherwise
+ *
+ ***********************************************************/
+
+int32_t vchi_initialise(VCHI_INSTANCE_T *instance_handle)
+{
+       VCHIQ_INSTANCE_T instance;
+       VCHIQ_STATUS_T status;
+
+       status = vchiq_initialise(&instance);
+
+       *instance_handle = (VCHI_INSTANCE_T)instance;
+
+       return vchiq_status_to_vchi(status);
+}
+EXPORT_SYMBOL(vchi_initialise);
+
+/***********************************************************
+ * Name: vchi_connect
+ *
+ * Arguments: VCHI_CONNECTION_T **connections
+ *            const uint32_t num_connections
+ *            VCHI_INSTANCE_T instance_handle)
+ *
+ * Description: Starts the command service on each connection,
+ *              causing INIT messages to be pinged back and forth
+ *
+ * Returns: 0 if successful, failure otherwise
+ *
+ ***********************************************************/
+int32_t vchi_connect(VCHI_CONNECTION_T **connections,
+       const uint32_t num_connections,
+       VCHI_INSTANCE_T instance_handle)
+{
+       VCHIQ_INSTANCE_T instance = (VCHIQ_INSTANCE_T)instance_handle;
+
+       (void)connections;
+       (void)num_connections;
+
+       return vchiq_connect(instance);
+}
+EXPORT_SYMBOL(vchi_connect);
+
+
+/***********************************************************
+ * Name: vchi_disconnect
+ *
+ * Arguments: VCHI_INSTANCE_T instance_handle
+ *
+ * Description: Stops the command service on each connection,
+ *              causing DE-INIT messages to be pinged back and forth
+ *
+ * Returns: 0 if successful, failure otherwise
+ *
+ ***********************************************************/
+int32_t vchi_disconnect(VCHI_INSTANCE_T instance_handle)
+{
+       VCHIQ_INSTANCE_T instance = (VCHIQ_INSTANCE_T)instance_handle;
+       return vchiq_status_to_vchi(vchiq_shutdown(instance));
+}
+EXPORT_SYMBOL(vchi_disconnect);
+
+
+/***********************************************************
+ * Name: vchi_service_open
+ * Name: vchi_service_create
+ *
+ * Arguments: VCHI_INSTANCE_T *instance_handle
+ *            SERVICE_CREATION_T *setup,
+ *            VCHI_SERVICE_HANDLE_T *handle
+ *
+ * Description: Routine to open a service
+ *
+ * Returns: int32_t - success == 0
+ *
+ ***********************************************************/
+
+static VCHIQ_STATUS_T shim_callback(VCHIQ_REASON_T reason,
+       VCHIQ_HEADER_T *header, VCHIQ_SERVICE_HANDLE_T handle, void *bulk_user)
+{
+       SHIM_SERVICE_T *service =
+               (SHIM_SERVICE_T *)VCHIQ_GET_SERVICE_USERDATA(handle);
+
+        if (!service->callback)
+               goto release;
+
+       switch (reason) {
+       case VCHIQ_MESSAGE_AVAILABLE:
+               vchiu_queue_push(&service->queue, header);
+
+               service->callback(service->callback_param,
+                                 VCHI_CALLBACK_MSG_AVAILABLE, NULL);
+
+               goto done;
+               break;
+
+       case VCHIQ_BULK_TRANSMIT_DONE:
+               service->callback(service->callback_param,
+                                 VCHI_CALLBACK_BULK_SENT, bulk_user);
+               break;
+
+       case VCHIQ_BULK_RECEIVE_DONE:
+               service->callback(service->callback_param,
+                                 VCHI_CALLBACK_BULK_RECEIVED, bulk_user);
+               break;
+
+       case VCHIQ_SERVICE_CLOSED:
+               service->callback(service->callback_param,
+                                 VCHI_CALLBACK_SERVICE_CLOSED, NULL);
+               break;
+
+       case VCHIQ_SERVICE_OPENED:
+               /* No equivalent VCHI reason */
+               break;
+
+       case VCHIQ_BULK_TRANSMIT_ABORTED:
+               service->callback(service->callback_param,
+                                 VCHI_CALLBACK_BULK_TRANSMIT_ABORTED,
+                                 bulk_user);
+               break;
+
+       case VCHIQ_BULK_RECEIVE_ABORTED:
+               service->callback(service->callback_param,
+                                 VCHI_CALLBACK_BULK_RECEIVE_ABORTED,
+                                 bulk_user);
+               break;
+
+       default:
+               WARN(1, "not supported\n");
+               break;
+       }
+
+release:
+        vchiq_release_message(service->handle, header);
+done:
+       return VCHIQ_SUCCESS;
+}
+
+static SHIM_SERVICE_T *service_alloc(VCHIQ_INSTANCE_T instance,
+       SERVICE_CREATION_T *setup)
+{
+       SHIM_SERVICE_T *service = kzalloc(sizeof(SHIM_SERVICE_T), GFP_KERNEL);
+
+       (void)instance;
+
+       if (service) {
+               if (vchiu_queue_init(&service->queue, 64)) {
+                       service->callback = setup->callback;
+                       service->callback_param = setup->callback_param;
+               } else {
+                       kfree(service);
+                       service = NULL;
+               }
+       }
+
+       return service;
+}
+
+static void service_free(SHIM_SERVICE_T *service)
+{
+       if (service) {
+               vchiu_queue_delete(&service->queue);
+               kfree(service);
+       }
+}
+
+int32_t vchi_service_open(VCHI_INSTANCE_T instance_handle,
+       SERVICE_CREATION_T *setup,
+       VCHI_SERVICE_HANDLE_T *handle)
+{
+       VCHIQ_INSTANCE_T instance = (VCHIQ_INSTANCE_T)instance_handle;
+       SHIM_SERVICE_T *service = service_alloc(instance, setup);
+       if (service) {
+               VCHIQ_SERVICE_PARAMS_T params;
+               VCHIQ_STATUS_T status;
+
+               memset(&params, 0, sizeof(params));
+               params.fourcc = setup->service_id;
+               params.callback = shim_callback;
+               params.userdata = service;
+               params.version = setup->version.version;
+               params.version_min = setup->version.version_min;
+
+               status = vchiq_open_service(instance, &params,
+                       &service->handle);
+               if (status != VCHIQ_SUCCESS) {
+                       service_free(service);
+                       service = NULL;
+               }
+       }
+
+       *handle = (VCHI_SERVICE_HANDLE_T)service;
+
+       return (service != NULL) ? 0 : -1;
+}
+EXPORT_SYMBOL(vchi_service_open);
+
+int32_t vchi_service_create(VCHI_INSTANCE_T instance_handle,
+       SERVICE_CREATION_T *setup,
+       VCHI_SERVICE_HANDLE_T *handle)
+{
+       VCHIQ_INSTANCE_T instance = (VCHIQ_INSTANCE_T)instance_handle;
+       SHIM_SERVICE_T *service = service_alloc(instance, setup);
+       if (service) {
+               VCHIQ_SERVICE_PARAMS_T params;
+               VCHIQ_STATUS_T status;
+
+               memset(&params, 0, sizeof(params));
+               params.fourcc = setup->service_id;
+               params.callback = shim_callback;
+               params.userdata = service;
+               params.version = setup->version.version;
+               params.version_min = setup->version.version_min;
+               status = vchiq_add_service(instance, &params, &service->handle);
+
+               if (status != VCHIQ_SUCCESS) {
+                       service_free(service);
+                       service = NULL;
+               }
+       }
+
+       *handle = (VCHI_SERVICE_HANDLE_T)service;
+
+       return (service != NULL) ? 0 : -1;
+}
+EXPORT_SYMBOL(vchi_service_create);
+
+int32_t vchi_service_close(const VCHI_SERVICE_HANDLE_T handle)
+{
+       int32_t ret = -1;
+       SHIM_SERVICE_T *service = (SHIM_SERVICE_T *)handle;
+       if (service) {
+               VCHIQ_STATUS_T status = vchiq_close_service(service->handle);
+               if (status == VCHIQ_SUCCESS) {
+                       service_free(service);
+                       service = NULL;
+               }
+
+               ret = vchiq_status_to_vchi(status);
+       }
+       return ret;
+}
+EXPORT_SYMBOL(vchi_service_close);
+
+int32_t vchi_service_destroy(const VCHI_SERVICE_HANDLE_T handle)
+{
+       int32_t ret = -1;
+       SHIM_SERVICE_T *service = (SHIM_SERVICE_T *)handle;
+       if (service) {
+               VCHIQ_STATUS_T status = vchiq_remove_service(service->handle);
+               if (status == VCHIQ_SUCCESS) {
+                       service_free(service);
+                       service = NULL;
+               }
+
+               ret = vchiq_status_to_vchi(status);
+       }
+       return ret;
+}
+EXPORT_SYMBOL(vchi_service_destroy);
+
+int32_t vchi_get_peer_version( const VCHI_SERVICE_HANDLE_T handle, short *peer_version )
+{
+   int32_t ret = -1;
+   SHIM_SERVICE_T *service = (SHIM_SERVICE_T *)handle;
+   if(service)
+   {
+      VCHIQ_STATUS_T status = vchiq_get_peer_version(service->handle, peer_version);
+      ret = vchiq_status_to_vchi( status );
+   }
+   return ret;
+}
+EXPORT_SYMBOL(vchi_get_peer_version);
+
+/* ----------------------------------------------------------------------
+ * read a uint32_t from buffer.
+ * network format is defined to be little endian
+ * -------------------------------------------------------------------- */
+uint32_t
+vchi_readbuf_uint32(const void *_ptr)
+{
+       const unsigned char *ptr = _ptr;
+       return ptr[0] | (ptr[1] << 8) | (ptr[2] << 16) | (ptr[3] << 24);
+}
+
+/* ----------------------------------------------------------------------
+ * write a uint32_t to buffer.
+ * network format is defined to be little endian
+ * -------------------------------------------------------------------- */
+void
+vchi_writebuf_uint32(void *_ptr, uint32_t value)
+{
+       unsigned char *ptr = _ptr;
+       ptr[0] = (unsigned char)((value >> 0)  & 0xFF);
+       ptr[1] = (unsigned char)((value >> 8)  & 0xFF);
+       ptr[2] = (unsigned char)((value >> 16) & 0xFF);
+       ptr[3] = (unsigned char)((value >> 24) & 0xFF);
+}
+
+/* ----------------------------------------------------------------------
+ * read a uint16_t from buffer.
+ * network format is defined to be little endian
+ * -------------------------------------------------------------------- */
+uint16_t
+vchi_readbuf_uint16(const void *_ptr)
+{
+       const unsigned char *ptr = _ptr;
+       return ptr[0] | (ptr[1] << 8);
+}
+
+/* ----------------------------------------------------------------------
+ * write a uint16_t into the buffer.
+ * network format is defined to be little endian
+ * -------------------------------------------------------------------- */
+void
+vchi_writebuf_uint16(void *_ptr, uint16_t value)
+{
+       unsigned char *ptr = _ptr;
+       ptr[0] = (value >> 0)  & 0xFF;
+       ptr[1] = (value >> 8)  & 0xFF;
+}
+
+/***********************************************************
+ * Name: vchi_service_use
+ *
+ * Arguments: const VCHI_SERVICE_HANDLE_T handle
+ *
+ * Description: Routine to increment refcount on a service
+ *
+ * Returns: void
+ *
+ ***********************************************************/
+int32_t vchi_service_use(const VCHI_SERVICE_HANDLE_T handle)
+{
+       int32_t ret = -1;
+       SHIM_SERVICE_T *service = (SHIM_SERVICE_T *)handle;
+       if (service)
+               ret = vchiq_status_to_vchi(vchiq_use_service(service->handle));
+       return ret;
+}
+EXPORT_SYMBOL(vchi_service_use);
+
+/***********************************************************
+ * Name: vchi_service_release
+ *
+ * Arguments: const VCHI_SERVICE_HANDLE_T handle
+ *
+ * Description: Routine to decrement refcount on a service
+ *
+ * Returns: void
+ *
+ ***********************************************************/
+int32_t vchi_service_release(const VCHI_SERVICE_HANDLE_T handle)
+{
+       int32_t ret = -1;
+       SHIM_SERVICE_T *service = (SHIM_SERVICE_T *)handle;
+       if (service)
+               ret = vchiq_status_to_vchi(
+                       vchiq_release_service(service->handle));
+       return ret;
+}
+EXPORT_SYMBOL(vchi_service_release);
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.c
@@ -0,0 +1,151 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "vchiq_util.h"
+
+static inline int is_pow2(int i)
+{
+       return i && !(i & (i - 1));
+}
+
+int vchiu_queue_init(VCHIU_QUEUE_T *queue, int size)
+{
+       WARN_ON(!is_pow2(size));
+
+       queue->size = size;
+       queue->read = 0;
+       queue->write = 0;
+
+       sema_init(&queue->pop, 0);
+       sema_init(&queue->push, 0);
+
+       queue->storage = kzalloc(size * sizeof(VCHIQ_HEADER_T *), GFP_KERNEL);
+       if (queue->storage == NULL) {
+               vchiu_queue_delete(queue);
+               return 0;
+       }
+       return 1;
+}
+
+void vchiu_queue_delete(VCHIU_QUEUE_T *queue)
+{
+       if (queue->storage != NULL)
+               kfree(queue->storage);
+}
+
+int vchiu_queue_is_empty(VCHIU_QUEUE_T *queue)
+{
+       return queue->read == queue->write;
+}
+
+int vchiu_queue_is_full(VCHIU_QUEUE_T *queue)
+{
+       return queue->write == queue->read + queue->size;
+}
+
+void vchiu_queue_push(VCHIU_QUEUE_T *queue, VCHIQ_HEADER_T *header)
+{
+       while (queue->write == queue->read + queue->size) {
+               if (down_interruptible(&queue->pop) != 0) {
+                       flush_signals(current);
+               }
+       }
+
+       /*
+        * Write to queue->storage must be visible after read from
+        * queue->read
+        */
+       smp_mb();
+
+       queue->storage[queue->write & (queue->size - 1)] = header;
+
+       /*
+        * Write to queue->storage must be visible before write to
+        * queue->write
+        */
+       smp_wmb();
+
+       queue->write++;
+
+       up(&queue->push);
+}
+
+VCHIQ_HEADER_T *vchiu_queue_peek(VCHIU_QUEUE_T *queue)
+{
+       while (queue->write == queue->read) {
+               if (down_interruptible(&queue->push) != 0) {
+                       flush_signals(current);
+               }
+       }
+
+       up(&queue->push); // We haven't removed anything from the queue.
+
+       /*
+        * Read from queue->storage must be visible after read from
+        * queue->write
+        */
+       smp_rmb();
+
+       return queue->storage[queue->read & (queue->size - 1)];
+}
+
+VCHIQ_HEADER_T *vchiu_queue_pop(VCHIU_QUEUE_T *queue)
+{
+       VCHIQ_HEADER_T *header;
+
+       while (queue->write == queue->read) {
+               if (down_interruptible(&queue->push) != 0) {
+                       flush_signals(current);
+               }
+       }
+
+       /*
+        * Read from queue->storage must be visible after read from
+        * queue->write
+        */
+       smp_rmb();
+
+       header = queue->storage[queue->read & (queue->size - 1)];
+
+       /*
+        * Read from queue->storage must be visible before write to
+        * queue->read
+        */
+       smp_mb();
+
+       queue->read++;
+
+       up(&queue->pop);
+
+       return header;
+}
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.h
@@ -0,0 +1,81 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef VCHIQ_UTIL_H
+#define VCHIQ_UTIL_H
+
+#include <linux/types.h>
+#include <linux/semaphore.h>
+#include <linux/mutex.h>
+#include <linux/bitops.h>
+#include <linux/kthread.h>
+#include <linux/wait.h>
+#include <linux/vmalloc.h>
+#include <linux/jiffies.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+#include <linux/random.h>
+#include <linux/sched.h>
+#include <linux/ctype.h>
+#include <linux/uaccess.h>
+#include <linux/time.h>  /* for time_t */
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+
+#include "vchiq_if.h"
+
+typedef struct {
+       int size;
+       int read;
+       int write;
+
+       struct semaphore pop;
+       struct semaphore push;
+
+       VCHIQ_HEADER_T **storage;
+} VCHIU_QUEUE_T;
+
+extern int  vchiu_queue_init(VCHIU_QUEUE_T *queue, int size);
+extern void vchiu_queue_delete(VCHIU_QUEUE_T *queue);
+
+extern int vchiu_queue_is_empty(VCHIU_QUEUE_T *queue);
+extern int vchiu_queue_is_full(VCHIU_QUEUE_T *queue);
+
+extern void vchiu_queue_push(VCHIU_QUEUE_T *queue, VCHIQ_HEADER_T *header);
+
+extern VCHIQ_HEADER_T *vchiu_queue_peek(VCHIU_QUEUE_T *queue);
+extern VCHIQ_HEADER_T *vchiu_queue_pop(VCHIU_QUEUE_T *queue);
+
+#endif
--- /dev/null
+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_version.c
@@ -0,0 +1,59 @@
+/**
+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The names of the above-listed copyright holders may not be used
+ *    to endorse or promote products derived from this software without
+ *    specific prior written permission.
+ *
+ * ALTERNATIVELY, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2, as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include "vchiq_build_info.h"
+#include <linux/broadcom/vc_debug_sym.h>
+
+VC_DEBUG_DECLARE_STRING_VAR( vchiq_build_hostname, "dc4-arm-01" );
+VC_DEBUG_DECLARE_STRING_VAR( vchiq_build_version, "9245b4c35b99b3870e1f7dc598c5692b3c66a6f0 (tainted)" );
+VC_DEBUG_DECLARE_STRING_VAR( vchiq_build_time,    __TIME__ );
+VC_DEBUG_DECLARE_STRING_VAR( vchiq_build_date,    __DATE__ );
+
+const char *vchiq_get_build_hostname( void )
+{
+   return vchiq_build_hostname;
+}
+
+const char *vchiq_get_build_version( void )
+{
+   return vchiq_build_version;
+}
+
+const char *vchiq_get_build_date( void )
+{
+   return vchiq_build_date;
+}
+
+const char *vchiq_get_build_time( void )
+{
+   return vchiq_build_time;
+}