target/linux/brcm2708/patches-3.14/0007-vchiq-Avoid-high-load-when-blocked-and-unkillable.patch

   1 From 376fdba15bcf4b106ba7d62ee350baf21099cfbf Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Mon, 12 May 2014 15:12:02 +0100
   4 Subject: [PATCH 07/54] vchiq: Avoid high load when blocked and unkillable
   5
   6 ---
   7  .../interface/vchiq_arm/vchiq_2835_arm.c           |  1 +
   8  .../vc04_services/interface/vchiq_arm/vchiq_arm.c  |  1 +
   9  .../interface/vchiq_arm/vchiq_connected.c          |  1 +
  10  .../vc04_services/interface/vchiq_arm/vchiq_core.c |  1 +
  11  .../interface/vchiq_arm/vchiq_kern_lib.c           |  1 +
  12  .../interface/vchiq_arm/vchiq_killable.h           | 69 ++++++++++++++++++++++
  13  .../vc04_services/interface/vchiq_arm/vchiq_util.c |  1 +
  14  7 files changed, 75 insertions(+)
  15  create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_killable.h
  16
  17 diff --git a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
  18 index b3bdaa2..7e7b09f 100644
  19 --- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
  20 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
  21 @@ -56,6 +56,7 @@
  22  #include "vchiq_arm.h"
  23  #include "vchiq_2835.h"
  24  #include "vchiq_connected.h"
  25 +#include "vchiq_killable.h"
  26
  27  #define MAX_FRAGMENTS (VCHIQ_NUM_CURRENT_BULKS * 2)
  28
  29 diff --git a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c
  30 index c1fb8c3..99c8967e 100644
  31 --- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c
  32 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c
  33 @@ -49,6 +49,7 @@
  34  #include "vchiq_core.h"
  35  #include "vchiq_ioctl.h"
  36  #include "vchiq_arm.h"
  37 +#include "vchiq_killable.h"
  38
  39  #define DEVICE_NAME "vchiq"
  40
  41 diff --git a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.c b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.c
  42 index 65f4b52..5efc62f 100644
  43 --- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.c
  44 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.c
  45 @@ -33,6 +33,7 @@
  46
  47  #include "vchiq_connected.h"
  48  #include "vchiq_core.h"
  49 +#include "vchiq_killable.h"
  50  #include <linux/module.h>
  51  #include <linux/mutex.h>
  52
  53 diff --git a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.c b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.c
  54 index f35ed4f..71ed0a5 100644
  55 --- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.c
  56 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.c
  57 @@ -32,6 +32,7 @@
  58   */
  59
  60  #include "vchiq_core.h"
  61 +#include "vchiq_killable.h"
  62
  63  #define VCHIQ_SLOT_HANDLER_STACK 8192
  64
  65 diff --git a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_kern_lib.c b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_kern_lib.c
  66 index be9735f..5a4182e 100644
  67 --- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_kern_lib.c
  68 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_kern_lib.c
  69 @@ -39,6 +39,7 @@
  70
  71  #include "vchiq_core.h"
  72  #include "vchiq_arm.h"
  73 +#include "vchiq_killable.h"
  74
  75  /* ---- Public Variables ------------------------------------------------- */
  76
  77 diff --git a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_killable.h b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_killable.h
  78 new file mode 100644
  79 index 0000000..505ee1a
  80 --- /dev/null
  81 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_killable.h
  82 @@ -0,0 +1,69 @@
  83 +/**
  84 + * Copyright (c) 2010-2012 Broadcom. All rights reserved.
  85 + *
  86 + * Redistribution and use in source and binary forms, with or without
  87 + * modification, are permitted provided that the following conditions
  88 + * are met:
  89 + * 1. Redistributions of source code must retain the above copyright
  90 + *    notice, this list of conditions, and the following disclaimer,
  91 + *    without modification.
  92 + * 2. Redistributions in binary form must reproduce the above copyright
  93 + *    notice, this list of conditions and the following disclaimer in the
  94 + *    documentation and/or other materials provided with the distribution.
  95 + * 3. The names of the above-listed copyright holders may not be used
  96 + *    to endorse or promote products derived from this software without
  97 + *    specific prior written permission.
  98 + *
  99 + * ALTERNATIVELY, this software may be distributed under the terms of the
 100 + * GNU General Public License ("GPL") version 2, as published by the Free
 101 + * Software Foundation.
 102 + *
 103 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 104 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 105 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 106 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 107 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 108 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 109 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 110 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 111 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 112 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 113 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 114 + */
 115 +
 116 +#ifndef VCHIQ_KILLABLE_H
 117 +#define VCHIQ_KILLABLE_H
 118 +
 119 +#include <linux/mutex.h>
 120 +#include <linux/semaphore.h>
 121 +
 122 +#define SHUTDOWN_SIGS   (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT))
 123 +
 124 +static inline int __must_check down_interruptible_killable(struct semaphore *sem)
 125 +{
 126 +       /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
 127 +       int ret;
 128 +       sigset_t blocked, oldset;
 129 +       siginitsetinv(&blocked, SHUTDOWN_SIGS);
 130 +       sigprocmask(SIG_SETMASK, &blocked, &oldset);
 131 +       ret = down_interruptible(sem);
 132 +       sigprocmask(SIG_SETMASK, &oldset, NULL);
 133 +       return ret;
 134 +}
 135 +#define down_interruptible down_interruptible_killable
 136 +
 137 +
 138 +static inline int __must_check mutex_lock_interruptible_killable(struct mutex *lock)
 139 +{
 140 +       /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
 141 +       int ret;
 142 +       sigset_t blocked, oldset;
 143 +       siginitsetinv(&blocked, SHUTDOWN_SIGS);
 144 +       sigprocmask(SIG_SETMASK, &blocked, &oldset);
 145 +       ret = mutex_lock_interruptible(lock);
 146 +       sigprocmask(SIG_SETMASK, &oldset, NULL);
 147 +       return ret;
 148 +}
 149 +#define mutex_lock_interruptible mutex_lock_interruptible_killable
 150 +
 151 +#endif
 152 diff --git a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.c b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.c
 153 index c2eefef..05e7979 100644
 154 --- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.c
 155 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.c
 156 @@ -32,6 +32,7 @@
 157   */
 158
 159  #include "vchiq_util.h"
 160 +#include "vchiq_killable.h"
 161
 162  static inline int is_pow2(int i)
 163  {
 164 --
 165 1.9.1
 166