Contributors: 17
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Wolfram Sang |
111 |
18.62% |
6 |
16.67% |
| Niklas Cassel |
93 |
15.60% |
1 |
2.78% |
| Linus Torvalds (pre-git) |
93 |
15.60% |
9 |
25.00% |
| Wim Van Sebroeck |
92 |
15.44% |
4 |
11.11% |
| Alan Cox |
72 |
12.08% |
2 |
5.56% |
| Anithra P Janakiraman |
37 |
6.21% |
1 |
2.78% |
| Dave Jones |
27 |
4.53% |
2 |
5.56% |
| Joe Perches |
21 |
3.52% |
1 |
2.78% |
| Li RongQing |
20 |
3.36% |
1 |
2.78% |
| Andrew Morton |
11 |
1.85% |
2 |
5.56% |
| Art Haas |
10 |
1.68% |
1 |
2.78% |
| Guenter Roeck |
2 |
0.34% |
1 |
2.78% |
| Tim Schmielau |
2 |
0.34% |
1 |
2.78% |
| Damien Riegel |
2 |
0.34% |
1 |
2.78% |
| Eric W. Biedermann |
1 |
0.17% |
1 |
2.78% |
| Julia Lawall |
1 |
0.17% |
1 |
2.78% |
| Andrey Panin |
1 |
0.17% |
1 |
2.78% |
| Total |
596 |
|
36 |
|
// 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");