1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * (c) Copyright 2021 Hewlett Packard Enterprise Development LP.
4  */
5 
6 #include <linux/hrtimer.h>
7 #include <linux/watchdog.h>
8 
9 #include "watchdog_core.h"
10 #include "watchdog_pretimeout.h"
11 
watchdog_hrtimer_pretimeout(struct hrtimer * timer)12 static enum hrtimer_restart watchdog_hrtimer_pretimeout(struct hrtimer *timer)
13 {
14 	struct watchdog_core_data *wd_data;
15 
16 	wd_data = container_of(timer, struct watchdog_core_data, pretimeout_timer);
17 
18 	watchdog_notify_pretimeout(wd_data->wdd);
19 	return HRTIMER_NORESTART;
20 }
21 
watchdog_hrtimer_pretimeout_init(struct watchdog_device * wdd)22 void watchdog_hrtimer_pretimeout_init(struct watchdog_device *wdd)
23 {
24 	struct watchdog_core_data *wd_data = wdd->wd_data;
25 
26 	hrtimer_init(&wd_data->pretimeout_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
27 	wd_data->pretimeout_timer.function = watchdog_hrtimer_pretimeout;
28 }
29 
watchdog_hrtimer_pretimeout_start(struct watchdog_device * wdd)30 void watchdog_hrtimer_pretimeout_start(struct watchdog_device *wdd)
31 {
32 	if (!(wdd->info->options & WDIOF_PRETIMEOUT) &&
33 	    !watchdog_pretimeout_invalid(wdd, wdd->pretimeout))
34 		hrtimer_start(&wdd->wd_data->pretimeout_timer,
35 			      ktime_set(wdd->timeout - wdd->pretimeout, 0),
36 			      HRTIMER_MODE_REL);
37 	else
38 		hrtimer_cancel(&wdd->wd_data->pretimeout_timer);
39 }
40 
watchdog_hrtimer_pretimeout_stop(struct watchdog_device * wdd)41 void watchdog_hrtimer_pretimeout_stop(struct watchdog_device *wdd)
42 {
43 	hrtimer_cancel(&wdd->wd_data->pretimeout_timer);
44 }
45