The role of the watchdog is to periodically feed the watchdog to the dog when the system CPU is working normally. Reset the timer. If there is a problem with the system, the dog is not fed to the watchdog. The watchdog resets the CPU due to timeout.
The system registers the watchdog interrupt request_irq after initialization (WDT0_ACCSCSSNBARK_INT, wdog_bark_handler, 0, "apps_wdog_bark", NULL);
And the timeout for initializing the watchdog, bark time,
__raw_writel(timeout, msm_tmr0_ba se + WDT0_BARK_TIME);
__raw_writel(timeout + 3*WDT_HZ, msm_tmr0_ba se + WDT0_BITE_TIME);
Reset the watchdog, enable the watchdog and interrupt the polarity.
__raw_writel(1, msm_tmr0_ba se + WDT0_EN);
__raw_writel(1, msm_tmr0_ba se + WDT0_RST);
Enable_percpu_irq(WDT0_ACCSCSSNBARK_INT, IRQ_TYPE_EDGE_RISING);
And initialize and start a timer, such as once every 10 seconds,
Schedule_delayed_work_on(0, &dogwork_struct, delay_time);
Static DECLARE_DELAYED_WORK(dogwork_struct, pet_watchdog_work);
Static DECLARE_WORK(init_dogwork_struct, init_watchdog_work);
Static struct msm_watchdog_pdata msm_watchdog_pdata = {
.pet_time = 10000,
.bark_time = 11000,
.has_secure = true,
.needs_expired_enable = true,
};
Delay_time = msecs_to_jiffies(pdata->pet_time);
Schedule_work_on(0, &init_dogwork_struct);
The timer is timed to reset the pet dog and restart the timer.
Static void pet_watchdog_work(struct work_struct *work)
{
Pet_watchdog();
If (enable)
Schedule_delayed_work_on(0, &dogwork_struct, delay_time);
}
If there is a problem with the system and there is no way to execute the return function of the timer, then the watchdog generates an interrupt, executing the interrupt service routine static irqreturn_t wdog_bark_handler(int irq, void *dev_id),
Execute panic. Panic("Apps watchdog bark received!");
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