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150 lines
5.6 KiB
Diff
150 lines
5.6 KiB
Diff
From e0412853d9f9e12fc7d8a3125cc3b4a62d19007d Mon Sep 17 00:00:00 2001
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From: popcornmix <popcornmix@gmail.com>
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Date: Mon, 12 May 2014 15:12:02 +0100
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Subject: [PATCH 011/114] vchiq: Avoid high load when blocked and unkillable
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vchiq: Include SIGSTOP and SIGCONT in list of signals not-masked by vchiq to allow gdb to work
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---
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.../interface/vchiq_arm/vchiq_2835_arm.c | 1 +
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.../vc04_services/interface/vchiq_arm/vchiq_arm.c | 1 +
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.../interface/vchiq_arm/vchiq_connected.c | 1 +
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.../vc04_services/interface/vchiq_arm/vchiq_core.c | 1 +
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.../interface/vchiq_arm/vchiq_kern_lib.c | 1 +
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.../interface/vchiq_arm/vchiq_killable.h | 69 ++++++++++++++++++++++
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.../vc04_services/interface/vchiq_arm/vchiq_util.c | 1 +
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7 files changed, 75 insertions(+)
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create mode 100644 drivers/misc/vc04_services/interface/vchiq_arm/vchiq_killable.h
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--- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
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+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_2835_arm.c
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@@ -56,6 +56,7 @@
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#include "vchiq_arm.h"
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#include "vchiq_2835.h"
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#include "vchiq_connected.h"
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+#include "vchiq_killable.h"
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#define MAX_FRAGMENTS (VCHIQ_NUM_CURRENT_BULKS * 2)
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--- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c
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+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_arm.c
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@@ -50,6 +50,7 @@
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#include "vchiq_ioctl.h"
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#include "vchiq_arm.h"
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#include "vchiq_debugfs.h"
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+#include "vchiq_killable.h"
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#define DEVICE_NAME "vchiq"
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--- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.c
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+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_connected.c
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@@ -33,6 +33,7 @@
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#include "vchiq_connected.h"
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#include "vchiq_core.h"
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+#include "vchiq_killable.h"
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#include <linux/module.h>
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#include <linux/mutex.h>
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--- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.c
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+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_core.c
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@@ -32,6 +32,7 @@
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*/
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#include "vchiq_core.h"
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+#include "vchiq_killable.h"
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#define VCHIQ_SLOT_HANDLER_STACK 8192
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--- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_kern_lib.c
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+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_kern_lib.c
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@@ -39,6 +39,7 @@
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#include "vchiq_core.h"
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#include "vchiq_arm.h"
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+#include "vchiq_killable.h"
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/* ---- Public Variables ------------------------------------------------- */
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--- /dev/null
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+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_killable.h
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@@ -0,0 +1,69 @@
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+/**
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+ * Copyright (c) 2010-2012 Broadcom. All rights reserved.
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+ *
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+ * Redistribution and use in source and binary forms, with or without
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+ * modification, are permitted provided that the following conditions
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+ * are met:
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+ * 1. Redistributions of source code must retain the above copyright
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+ * notice, this list of conditions, and the following disclaimer,
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+ * without modification.
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+ * 2. Redistributions in binary form must reproduce the above copyright
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+ * notice, this list of conditions and the following disclaimer in the
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+ * documentation and/or other materials provided with the distribution.
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+ * 3. The names of the above-listed copyright holders may not be used
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+ * to endorse or promote products derived from this software without
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+ * specific prior written permission.
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+ *
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+ * ALTERNATIVELY, this software may be distributed under the terms of the
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+ * GNU General Public License ("GPL") version 2, as published by the Free
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+ * Software Foundation.
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+ *
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+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+ */
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+
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+#ifndef VCHIQ_KILLABLE_H
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+#define VCHIQ_KILLABLE_H
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+
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+#include <linux/mutex.h>
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+#include <linux/semaphore.h>
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+
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+#define SHUTDOWN_SIGS (sigmask(SIGKILL) | sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTRAP) | sigmask(SIGSTOP) | sigmask(SIGCONT))
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+
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+static inline int __must_check down_interruptible_killable(struct semaphore *sem)
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+{
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+ /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
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+ int ret;
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+ sigset_t blocked, oldset;
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+ siginitsetinv(&blocked, SHUTDOWN_SIGS);
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+ sigprocmask(SIG_SETMASK, &blocked, &oldset);
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+ ret = down_interruptible(sem);
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+ sigprocmask(SIG_SETMASK, &oldset, NULL);
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+ return ret;
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+}
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+#define down_interruptible down_interruptible_killable
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+
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+
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+static inline int __must_check mutex_lock_interruptible_killable(struct mutex *lock)
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+{
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+ /* Allow interception of killable signals only. We don't want to be interrupted by harmless signals like SIGALRM */
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+ int ret;
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+ sigset_t blocked, oldset;
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+ siginitsetinv(&blocked, SHUTDOWN_SIGS);
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+ sigprocmask(SIG_SETMASK, &blocked, &oldset);
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+ ret = mutex_lock_interruptible(lock);
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+ sigprocmask(SIG_SETMASK, &oldset, NULL);
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+ return ret;
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+}
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+#define mutex_lock_interruptible mutex_lock_interruptible_killable
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+
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+#endif
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--- a/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.c
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+++ b/drivers/misc/vc04_services/interface/vchiq_arm/vchiq_util.c
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@@ -32,6 +32,7 @@
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*/
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#include "vchiq_util.h"
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+#include "vchiq_killable.h"
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static inline int is_pow2(int i)
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{
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