mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
d017327893
This gets rid of the unnecessary license boilerplate, and avoids having to deal with individual patches one by one. No functional changes. Reviewed-by: Jerry Hoemann <jerry.hoemann@hpe.com> Acked-by: Sylvain Lemieux <slemieux.tyco@gmail.com> Reviewed-by: Matthias Brugger <matthias.bgg@gmail.com> Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
168 lines
4.3 KiB
C
168 lines
4.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* SoftDog: A Software Watchdog Device
|
|
*
|
|
* (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
|
|
* All Rights Reserved.
|
|
*
|
|
* Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
|
|
* warranty for any of this software. This material is provided
|
|
* "AS-IS" and at no charge.
|
|
*
|
|
* (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
|
|
*
|
|
* Software only watchdog driver. Unlike its big brother the WDT501P
|
|
* driver this won't always recover a failed machine.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/hrtimer.h>
|
|
#include <linux/init.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/reboot.h>
|
|
#include <linux/types.h>
|
|
#include <linux/watchdog.h>
|
|
|
|
#define TIMER_MARGIN 60 /* Default is 60 seconds */
|
|
static unsigned int soft_margin = TIMER_MARGIN; /* in seconds */
|
|
module_param(soft_margin, uint, 0);
|
|
MODULE_PARM_DESC(soft_margin,
|
|
"Watchdog soft_margin in seconds. (0 < soft_margin < 65536, default="
|
|
__MODULE_STRING(TIMER_MARGIN) ")");
|
|
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
|
module_param(nowayout, bool, 0);
|
|
MODULE_PARM_DESC(nowayout,
|
|
"Watchdog cannot be stopped once started (default="
|
|
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
|
|
|
static int soft_noboot;
|
|
module_param(soft_noboot, int, 0);
|
|
MODULE_PARM_DESC(soft_noboot,
|
|
"Softdog action, set to 1 to ignore reboots, 0 to reboot (default=0)");
|
|
|
|
static int soft_panic;
|
|
module_param(soft_panic, int, 0);
|
|
MODULE_PARM_DESC(soft_panic,
|
|
"Softdog action, set to 1 to panic, 0 to reboot (default=0)");
|
|
|
|
static struct hrtimer softdog_ticktock;
|
|
static struct hrtimer softdog_preticktock;
|
|
|
|
static enum hrtimer_restart softdog_fire(struct hrtimer *timer)
|
|
{
|
|
module_put(THIS_MODULE);
|
|
if (soft_noboot) {
|
|
pr_crit("Triggered - Reboot ignored\n");
|
|
} else if (soft_panic) {
|
|
pr_crit("Initiating panic\n");
|
|
panic("Software Watchdog Timer expired");
|
|
} else {
|
|
pr_crit("Initiating system reboot\n");
|
|
emergency_restart();
|
|
pr_crit("Reboot didn't ?????\n");
|
|
}
|
|
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
static struct watchdog_device softdog_dev;
|
|
|
|
static enum hrtimer_restart softdog_pretimeout(struct hrtimer *timer)
|
|
{
|
|
watchdog_notify_pretimeout(&softdog_dev);
|
|
|
|
return HRTIMER_NORESTART;
|
|
}
|
|
|
|
static int softdog_ping(struct watchdog_device *w)
|
|
{
|
|
if (!hrtimer_active(&softdog_ticktock))
|
|
__module_get(THIS_MODULE);
|
|
hrtimer_start(&softdog_ticktock, ktime_set(w->timeout, 0),
|
|
HRTIMER_MODE_REL);
|
|
|
|
if (IS_ENABLED(CONFIG_SOFT_WATCHDOG_PRETIMEOUT)) {
|
|
if (w->pretimeout)
|
|
hrtimer_start(&softdog_preticktock,
|
|
ktime_set(w->timeout - w->pretimeout, 0),
|
|
HRTIMER_MODE_REL);
|
|
else
|
|
hrtimer_cancel(&softdog_preticktock);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int softdog_stop(struct watchdog_device *w)
|
|
{
|
|
if (hrtimer_cancel(&softdog_ticktock))
|
|
module_put(THIS_MODULE);
|
|
|
|
if (IS_ENABLED(CONFIG_SOFT_WATCHDOG_PRETIMEOUT))
|
|
hrtimer_cancel(&softdog_preticktock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct watchdog_info softdog_info = {
|
|
.identity = "Software Watchdog",
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
|
|
};
|
|
|
|
static const struct watchdog_ops softdog_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = softdog_ping,
|
|
.stop = softdog_stop,
|
|
};
|
|
|
|
static struct watchdog_device softdog_dev = {
|
|
.info = &softdog_info,
|
|
.ops = &softdog_ops,
|
|
.min_timeout = 1,
|
|
.max_timeout = 65535,
|
|
.timeout = TIMER_MARGIN,
|
|
};
|
|
|
|
static int __init softdog_init(void)
|
|
{
|
|
int ret;
|
|
|
|
watchdog_init_timeout(&softdog_dev, soft_margin, NULL);
|
|
watchdog_set_nowayout(&softdog_dev, nowayout);
|
|
watchdog_stop_on_reboot(&softdog_dev);
|
|
|
|
hrtimer_init(&softdog_ticktock, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
|
|
softdog_ticktock.function = softdog_fire;
|
|
|
|
if (IS_ENABLED(CONFIG_SOFT_WATCHDOG_PRETIMEOUT)) {
|
|
softdog_info.options |= WDIOF_PRETIMEOUT;
|
|
hrtimer_init(&softdog_preticktock, CLOCK_MONOTONIC,
|
|
HRTIMER_MODE_REL);
|
|
softdog_preticktock.function = softdog_pretimeout;
|
|
}
|
|
|
|
ret = watchdog_register_device(&softdog_dev);
|
|
if (ret)
|
|
return ret;
|
|
|
|
pr_info("initialized. soft_noboot=%d soft_margin=%d sec soft_panic=%d (nowayout=%d)\n",
|
|
soft_noboot, softdog_dev.timeout, soft_panic, nowayout);
|
|
|
|
return 0;
|
|
}
|
|
module_init(softdog_init);
|
|
|
|
static void __exit softdog_exit(void)
|
|
{
|
|
watchdog_unregister_device(&softdog_dev);
|
|
}
|
|
module_exit(softdog_exit);
|
|
|
|
MODULE_AUTHOR("Alan Cox");
|
|
MODULE_DESCRIPTION("Software Watchdog Device Driver");
|
|
MODULE_LICENSE("GPL");
|