linux/drivers/watchdog/softdog.c

// SPDX-License-Identifier: GPL-2.0+
/*
 *	SoftDog:	A Software Watchdog Device
 *
 *	(c) Copyright 1996 Alan Cox <[email protected]>,
 *							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 <[email protected]>
 *
 *	Software only watchdog driver. Unlike its big brother the WDT501P
 *	driver this won't always recover a failed machine.
 */

#define pr_fmt(fmt) …

#include <linux/hrtimer.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/reboot.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#include <linux/workqueue.h>

#define TIMER_MARGIN …
static unsigned int soft_margin = …;	/* in seconds */
module_param(soft_margin, uint, 0);
MODULE_PARM_DESC(…) …;

static bool nowayout = … WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(…) …;

static int soft_noboot;
module_param(soft_noboot, int, 0);
MODULE_PARM_DESC(…) …;

static int soft_panic;
module_param(soft_panic, int, 0);
MODULE_PARM_DESC(…) …;

static char *soft_reboot_cmd;
module_param(soft_reboot_cmd, charp, 0000);
MODULE_PARM_DESC(…) …;

static bool soft_active_on_boot;
module_param(soft_active_on_boot, bool, 0000);
MODULE_PARM_DESC(…) …;

static struct hrtimer softdog_ticktock;
static struct hrtimer softdog_preticktock;

static int reboot_kthread_fn(void *data)
{ … }

static void reboot_work_fn(struct work_struct *unused)
{ … }

static enum hrtimer_restart softdog_fire(struct hrtimer *timer)
{ … }

static struct watchdog_device softdog_dev;

static enum hrtimer_restart softdog_pretimeout(struct hrtimer *timer)
{ … }

static int softdog_ping(struct watchdog_device *w)
{ … }

static int softdog_stop(struct watchdog_device *w)
{ … }

static struct watchdog_info softdog_info = …;

static const struct watchdog_ops softdog_ops = …;

static struct watchdog_device softdog_dev = …;

static int __init softdog_init(void)
{ … }
module_init(…) …;

static void __exit softdog_exit(void)
{ … }
module_exit(softdog_exit);

MODULE_AUTHOR(…) …;
MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;