Release 4.11 drivers/watchdog/softdog.c

/*
 *      SoftDog:        A Software Watchdog Device
 *
 *      (c) Copyright 1996 Alan Cox <alan@lxorguk.ukuu.org.uk>,
 *                                                      All Rights Reserved.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 *
 *      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;
}

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13
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8.33%
Joe Perches
12
18.75%
1
8.33%
Linus Torvalds (pre-git)
10
15.62%
2
16.67%
Niklas Cassel
9
14.06%
1
8.33%
Dave Jones
6
9.38%
1
8.33%
Li RongQing
5
7.81%
1
8.33%
Wim Van Sebroeck
4
6.25%
1
8.33%
Wolfram Sang
3
4.69%
2
16.67%
Andrew Morton
1
1.56%
1
8.33%
Eric W. Biedermann
1
1.56%
1
8.33%
Total
64
100.00%
12
100.00%


static struct watchdog_device softdog_dev;



static enum hrtimer_restart softdog_pretimeout(struct hrtimer *timer)
{
	watchdog_notify_pretimeout(&softdog_dev);

	return HRTIMER_NORESTART;
}

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57.14%
1
50.00%
Niklas Cassel
9
42.86%
1
50.00%
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21
100.00%
2
100.00%



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;
}

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Wolfram Sang
35
39.77%
3
33.33%
Niklas Cassel
27
30.68%
1
11.11%
Wim Van Sebroeck
10
11.36%
1
11.11%
Li RongQing
8
9.09%
1
11.11%
Alan Cox
5
5.68%
1
11.11%
Linus Torvalds (pre-git)
2
2.27%
1
11.11%
Dave Jones
1
1.14%
1
11.11%
Total
88
100.00%
9
100.00%



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;
}

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14
35.00%
1
14.29%
Wolfram Sang
13
32.50%
3
42.86%
Li RongQing
7
17.50%
1
14.29%
Alan Cox
4
10.00%
1
14.29%
Niklas Cassel
2
5.00%
1
14.29%
Total
40
100.00%
7
100.00%


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;
}
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26.72%
4
28.57%
Wolfram Sang
24
20.69%
3
21.43%
Alan Cox
13
11.21%
1
7.14%
Wim Van Sebroeck
6
5.17%
1
7.14%
Joe Perches
2
1.72%
1
7.14%
Damien Riegel
2
1.72%
1
7.14%
Anithra P Janakiraman
2
1.72%
1
7.14%
Dave Jones
2
1.72%
1
7.14%
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116
100.00%
14
100.00%


module_init(softdog_init);



static void __exit softdog_exit(void)
{
	watchdog_unregister_device(&softdog_dev);
}
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60.00%
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2
13.33%
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Wolfram Sang
1
6.67%
1
20.00%
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15
100.00%
5
100.00%


module_exit(softdog_exit);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("Software Watchdog Device Driver");
MODULE_LICENSE("GPL");
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112
18.82%
7
19.44%
Linus Torvalds (pre-git)
95
15.97%
9
25.00%
Niklas Cassel
93
15.63%
1
2.78%
Wim Van Sebroeck
92
15.46%
4
11.11%
Alan Cox
72
12.10%
2
5.56%
Anithra P Janakiraman
35
5.88%
1
2.78%
Dave Jones
27
4.54%
2
5.56%
Joe Perches
21
3.53%
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%
Tim Schmielau
2
0.34%
1
2.78%
Damien Riegel
2
0.34%
1
2.78%
Eric W. Biedermann
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0.17%
1
2.78%
Andrey Panin
1
0.17%
1
2.78%
Julia Lawall
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0.17%
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Directory: drivers/watchdog

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