target/linux/brcm2708/patches-3.18/0011-vchiq-Avoid-high-load-when-blocked-and-unkillable.patch

   1 From e0412853d9f9e12fc7d8a3125cc3b4a62d19007d 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 011/114] vchiq: Avoid high load when blocked and unkillable
   5
   6 vchiq: Include SIGSTOP and SIGCONT in list of signals not-masked by vchiq to allow gdb to work
   7 ---
   8  .../interface/vchiq_arm/vchiq_2835_arm.c           |  1 +
   9  .../vc04_services/interface/vchiq_arm/vchiq_arm.c  |  1 +
  10  .../interface/vchiq_arm/vchiq_connected.c          |  1 +
  11  .../vc04_services/interface/vchiq_arm/vchiq_core.c |  1 +
  12  .../interface/vchiq_arm/vchiq_kern_lib.c           |  1 +
  13  .../interface/vchiq_arm/vchiq_killable.h           | 69 ++++++++++++++++++++++
  14  .../vc04_services/interface/vchiq_arm/vchiq_util.c |  1 +
  15  7 files changed, 75 insertions(+)
  16  create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_killable.h
  17
  18 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
  19 index b3bdaa2..7e7b09f 100644
  20 --- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
  21 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
  22 @@ -56,6 +56,7 @@
  23  #include "vchiq_arm.h"
  24  #include "vchiq_2835.h"
  25  #include "vchiq_connected.h"
  26 +#include "vchiq_killable.h"
  27
  28  #define MAX_FRAGMENTS (VCHIQ_NUM_CURRENT_BULKS * 2)
  29
  30 diff --git a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c
  31 index 2596818..3e328ab 100644
  32 --- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c
  33 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c
  34 @@ -50,6 +50,7 @@
  35  #include "vchiq_ioctl.h"
  36  #include "vchiq_arm.h"
  37  #include "vchiq_debugfs.h"
  38 +#include "vchiq_killable.h"
  39
  40  #define DEVICE_NAME "vchiq"
  41
  42 diff --git a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.c b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.c
  43 index 65f4b52..5efc62f 100644
  44 --- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.c
  45 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.c
  46 @@ -33,6 +33,7 @@
  47
  48  #include "vchiq_connected.h"
  49  #include "vchiq_core.h"
  50 +#include "vchiq_killable.h"
  51  #include <linux/module.h>
  52  #include <linux/mutex.h>
  53
  54 diff --git a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.c b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.c
  55 index f962027..14a4155 100644
  56 --- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.c
  57 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.c
  58 @@ -32,6 +32,7 @@
  59   */
  60
  61  #include "vchiq_core.h"
  62 +#include "vchiq_killable.h"
  63
  64  #define VCHIQ_SLOT_HANDLER_STACK 8192
  65
  66 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
  67 index be9735f..5a4182e 100644
  68 --- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_kern_lib.c
  69 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_kern_lib.c
  70 @@ -39,6 +39,7 @@
  71
  72  #include "vchiq_core.h"
  73  #include "vchiq_arm.h"
  74 +#include "vchiq_killable.h"
  75
  76  /* ---- Public Variables ------------------------------------------------- */
  77
  78 diff --git a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_killable.h b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_killable.h
  79 new file mode 100644
  80 index 0000000..335446e
  81 --- /dev/null
  82 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_killable.h
  83 @@ -0,0 +1,69 @@
  84 +/**
  85 + * Copyright (c) 2010-2012 Broadcom. All rights reserved.
  86 + *
  87 + * Redistribution and use in source and binary forms, with or without
  88 + * modification, are permitted provided that the following conditions
  89 + * are met:
  90 + * 1. Redistributions of source code must retain the above copyright
  91 + *    notice, this list of conditions, and the following disclaimer,
  92 + *    without modification.
  93 + * 2. Redistributions in binary form must reproduce the above copyright
  94 + *    notice, this list of conditions and the following disclaimer in the
  95 + *    documentation and/or other materials provided with the distribution.
  96 + * 3. The names of the above-listed copyright holders may not be used
  97 + *    to endorse or promote products derived from this software without
  98 + *    specific prior written permission.
  99 + *
 100 + * ALTERNATIVELY, this software may be distributed under the terms of the
 101 + * GNU General Public License ("GPL") version 2, as published by the Free
 102 + * Software Foundation.
 103 + *
 104 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 105 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 106 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 107 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 108 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 109 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 110 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 111 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 112 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 113 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 114 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 115 + */
 116 +
 117 +#ifndef VCHIQ_KILLABLE_H
 118 +#define VCHIQ_KILLABLE_H
 119 +
 120 +#include <linux/mutex.h>
 121 +#include <linux/semaphore.h>
 122 +
 123 +#define SHUTDOWN_SIGS   (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTRAP) | sigmask(SIGSTOP) | sigmask(SIGCONT))
 124 +
 125 +static inline int __must_check down_interruptible_killable(struct semaphore *sem)
 126 +{
 127 +       /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
 128 +       int ret;
 129 +       sigset_t blocked, oldset;
 130 +       siginitsetinv(&blocked, SHUTDOWN_SIGS);
 131 +       sigprocmask(SIG_SETMASK, &blocked, &oldset);
 132 +       ret = down_interruptible(sem);
 133 +       sigprocmask(SIG_SETMASK, &oldset, NULL);
 134 +       return ret;
 135 +}
 136 +#define down_interruptible down_interruptible_killable
 137 +
 138 +
 139 +static inline int __must_check mutex_lock_interruptible_killable(struct mutex *lock)
 140 +{
 141 +       /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
 142 +       int ret;
 143 +       sigset_t blocked, oldset;
 144 +       siginitsetinv(&blocked, SHUTDOWN_SIGS);
 145 +       sigprocmask(SIG_SETMASK, &blocked, &oldset);
 146 +       ret = mutex_lock_interruptible(lock);
 147 +       sigprocmask(SIG_SETMASK, &oldset, NULL);
 148 +       return ret;
 149 +}
 150 +#define mutex_lock_interruptible mutex_lock_interruptible_killable
 151 +
 152 +#endif
 153 diff --git a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.c b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.c
 154 index c2eefef..05e7979 100644
 155 --- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.c
 156 +++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.c
 157 @@ -32,6 +32,7 @@
 158   */
 159
 160  #include "vchiq_util.h"
 161 +#include "vchiq_killable.h"
 162
 163  static inline int is_pow2(int i)
 164  {
 165 --
 166 1.8.3.2
 167