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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2026 Google LLC
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/nmi.h>
#include <linux/watchdog.h>
#include "watchdog_pretimeout.h"
/**
* pretimeout_dump - Dump on watchdog pretimeout event
* @wdd: watchdog_device
*
* Dump all cpu backtrace on pretimeout event.
*/
static void pretimeout_dump(struct watchdog_device *wdd)
{
pr_alert("watchdog%d: pretimeout event\n", wdd->id);
if (!trigger_all_cpu_backtrace())
pr_alert("trigger_all_cpu_backtrace() isn't available\n");
}
static struct watchdog_governor watchdog_gov_dump = {
.name = "dump",
.pretimeout = pretimeout_dump,
};
static int __init watchdog_gov_dump_register(void)
{
return watchdog_register_governor(&watchdog_gov_dump);
}
static void __exit watchdog_gov_dump_unregister(void)
{
watchdog_unregister_governor(&watchdog_gov_dump);
}
module_init(watchdog_gov_dump_register);
module_exit(watchdog_gov_dump_unregister);
MODULE_AUTHOR("Tzung-Bi Shih <tzungbi@kernel.org>");
MODULE_DESCRIPTION("Dump watchdog pretimeout governor");
MODULE_LICENSE("GPL");
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