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