drivers/watchdog/watchdog_hrtimer_pretimeout.c

   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
  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
  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
  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
  41 void watchdog_hrtimer_pretimeout_stop(struct watchdog_device *wdd)
  42 {
  43         hrtimer_cancel(&wdd->wd_data->pretimeout_timer);
  44 }