6  * but triggers a RTC alarm if the box is suspend.
8  * This interface is influenced by the Android RTC Alarm timer
37  * struct alarm_base - Alarm timer bases
61 /* rtc timer and device for setting alarm wakeups at suspend */
152  * alarmtimer_enqueue - Adds an alarm timer to an alarm_base timerqueue
154  * @alarm: pointer to alarm being enqueued.
156  * Adds alarm to a alarm_base timerqueue
160 static void alarmtimer_enqueue(struct alarm_base *base, struct alarm *alarm)  in alarmtimer_enqueue()  argument
162 	if (alarm->state & ALARMTIMER_STATE_ENQUEUED)  in alarmtimer_enqueue()
163 		timerqueue_del(&base->timerqueue, &alarm->node);  in alarmtimer_enqueue()
165 	timerqueue_add(&base->timerqueue, &alarm->node);  in alarmtimer_enqueue()
166 	alarm->state |= ALARMTIMER_STATE_ENQUEUED;  in alarmtimer_enqueue()
170  * alarmtimer_dequeue - Removes an alarm timer from an alarm_base timerqueue
172  * @alarm: pointer to alarm being removed
174  * Removes alarm to a alarm_base timerqueue
178 static void alarmtimer_dequeue(struct alarm_base *base, struct alarm *alarm)  in alarmtimer_dequeue()  argument
180 	if (!(alarm->state & ALARMTIMER_STATE_ENQUEUED))  in alarmtimer_dequeue()
183 	timerqueue_del(&base->timerqueue, &alarm->node);  in alarmtimer_dequeue()
184 	alarm->state &= ~ALARMTIMER_STATE_ENQUEUED;  in alarmtimer_dequeue()
189  * alarmtimer_fired - Handles alarm hrtimer being fired.
192  * When a alarm timer fires, this runs through the timerqueue to
193  * see which alarms expired, and runs those. If there are more alarm
195  * the next future alarm timer expires.
199 	struct alarm *alarm = container_of(timer, struct alarm, timer);  in alarmtimer_fired()  local
200 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarmtimer_fired()
206 	alarmtimer_dequeue(base, alarm);  in alarmtimer_fired()
209 	if (alarm->function)  in alarmtimer_fired()
210 		restart = alarm->function(alarm, base->get_ktime());  in alarmtimer_fired()
214 		hrtimer_set_expires(&alarm->timer, alarm->node.expires);  in alarmtimer_fired()
215 		alarmtimer_enqueue(base, alarm);  in alarmtimer_fired()
220 	trace_alarmtimer_fired(alarm, base->get_ktime());  in alarmtimer_fired()
225 ktime_t alarm_expires_remaining(const struct alarm *alarm)  in alarm_expires_remaining()  argument
227 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_expires_remaining()
228 	return ktime_sub(alarm->node.expires, base->get_ktime());  in alarm_expires_remaining()
296 	/* Set alarm, if in the past reject suspend briefly to handle */  in alarmtimer_suspend()
326 __alarm_init(struct alarm *alarm, enum alarmtimer_type type,  in __alarm_init()  argument
327 	     enum alarmtimer_restart (*function)(struct alarm *, ktime_t))  in __alarm_init()  argument
329 	timerqueue_init(&alarm->node);  in __alarm_init()
330 	alarm->timer.function = alarmtimer_fired;  in __alarm_init()
331 	alarm->function = function;  in __alarm_init()
332 	alarm->type = type;  in __alarm_init()
333 	alarm->state = ALARMTIMER_STATE_INACTIVE;  in __alarm_init()
337  * alarm_init - Initialize an alarm structure
338  * @alarm: ptr to alarm to be initialized
339  * @type: the type of the alarm
340  * @function: callback that is run when the alarm fires
342 void alarm_init(struct alarm *alarm, enum alarmtimer_type type,  in alarm_init()  argument
343 		enum alarmtimer_restart (*function)(struct alarm *, ktime_t))  in alarm_init()  argument
345 	hrtimer_init(&alarm->timer, alarm_bases[type].base_clockid,  in alarm_init()
347 	__alarm_init(alarm, type, function);  in alarm_init()
352  * alarm_start - Sets an absolute alarm to fire
353  * @alarm: ptr to alarm to set
354  * @start: time to run the alarm
356 void alarm_start(struct alarm *alarm, ktime_t start)  in alarm_start()  argument
358 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_start()
362 	alarm->node.expires = start;  in alarm_start()
363 	alarmtimer_enqueue(base, alarm);  in alarm_start()
364 	hrtimer_start(&alarm->timer, alarm->node.expires, HRTIMER_MODE_ABS);  in alarm_start()
367 	trace_alarmtimer_start(alarm, base->get_ktime());  in alarm_start()
372  * alarm_start_relative - Sets a relative alarm to fire
373  * @alarm: ptr to alarm to set
374  * @start: time relative to now to run the alarm
376 void alarm_start_relative(struct alarm *alarm, ktime_t start)  in alarm_start_relative()  argument
378 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_start_relative()
381 	alarm_start(alarm, start);  in alarm_start_relative()
385 void alarm_restart(struct alarm *alarm)  in alarm_restart()  argument
387 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_restart()
391 	hrtimer_set_expires(&alarm->timer, alarm->node.expires);  in alarm_restart()
392 	hrtimer_restart(&alarm->timer);  in alarm_restart()
393 	alarmtimer_enqueue(base, alarm);  in alarm_restart()
399  * alarm_try_to_cancel - Tries to cancel an alarm timer
400  * @alarm: ptr to alarm to be canceled
405 int alarm_try_to_cancel(struct alarm *alarm)  in alarm_try_to_cancel()  argument
407 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_try_to_cancel()
412 	ret = hrtimer_try_to_cancel(&alarm->timer);  in alarm_try_to_cancel()
414 		alarmtimer_dequeue(base, alarm);  in alarm_try_to_cancel()
417 	trace_alarmtimer_cancel(alarm, base->get_ktime());  in alarm_try_to_cancel()
424  * alarm_cancel - Spins trying to cancel an alarm timer until it is done
425  * @alarm: ptr to alarm to be canceled
429 int alarm_cancel(struct alarm *alarm)  in alarm_cancel()  argument
432 		int ret = alarm_try_to_cancel(alarm);  in alarm_cancel()
435 		hrtimer_cancel_wait_running(&alarm->timer);  in alarm_cancel()
441 u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval)  in alarm_forward()  argument
446 	delta = ktime_sub(now, alarm->node.expires);  in alarm_forward()
456 		alarm->node.expires = ktime_add_ns(alarm->node.expires,  in alarm_forward()
459 		if (alarm->node.expires > now)  in alarm_forward()
468 	alarm->node.expires = ktime_add_safe(alarm->node.expires, interval);  in alarm_forward()
473 u64 alarm_forward_now(struct alarm *alarm, ktime_t interval)  in alarm_forward_now()  argument
475 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_forward_now()
477 	return alarm_forward(alarm, base->get_ktime(), interval);  in alarm_forward_now()
499 		WARN_ONCE(1, "Invalid alarm type: %d\n", type);  in alarmtimer_freezerset()
529  * @alarm: alarm that fired
531  * Posix timer callback for expired alarm timers.
533 static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm,  in alarm_handle_timer()  argument
536 	struct k_itimer *ptr = container_of(alarm, struct k_itimer,  in alarm_handle_timer()
537 					    it.alarm.alarmtimer);  in alarm_handle_timer()
553 		ptr->it_overrun += alarm_forward_now(alarm, ptr->it_interval);  in alarm_handle_timer()
569 	struct alarm *alarm = &timr->it.alarm.alarmtimer;  in alarm_timer_rearm()  local
571 	timr->it_overrun += alarm_forward_now(alarm, timr->it_interval);  in alarm_timer_rearm()
572 	alarm_start(alarm, alarm->node.expires);  in alarm_timer_rearm()
582 	struct alarm *alarm = &timr->it.alarm.alarmtimer;  in alarm_timer_forward()  local
584 	return alarm_forward(alarm, timr->it_interval, now);  in alarm_timer_forward()
594 	struct alarm *alarm = &timr->it.alarm.alarmtimer;  in alarm_timer_remaining()  local
596 	return ktime_sub(alarm->node.expires, now);  in alarm_timer_remaining()
605 	return alarm_try_to_cancel(&timr->it.alarm.alarmtimer);  in alarm_timer_try_to_cancel()
618 	hrtimer_cancel_wait_running(&timr->it.alarm.alarmtimer.timer);  in alarm_timer_wait_running()
631 	struct alarm *alarm = &timr->it.alarm.alarmtimer;  in alarm_timer_arm()  local
632 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_timer_arm()
637 		alarm->node.expires = expires;  in alarm_timer_arm()
639 		alarm_start(&timr->it.alarm.alarmtimer, expires);  in alarm_timer_arm()
647  * Returns the granularity of underlying alarm base clock
664  * Provides the underlying alarm base time in a tasks time namespace.
682  * Provides the underlying alarm base time in the root namespace.
711 	alarm_init(&new_timer->it.alarm.alarmtimer, type, alarm_handle_timer);  in alarm_timer_create()
717  * @alarm: ptr to alarm that fired
721 static enum alarmtimer_restart alarmtimer_nsleep_wakeup(struct alarm *alarm,  in alarmtimer_nsleep_wakeup()  argument
724 	struct task_struct *task = (struct task_struct *)alarm->data;  in alarmtimer_nsleep_wakeup()
726 	alarm->data = NULL;  in alarmtimer_nsleep_wakeup()
734  * @alarm: ptr to alarmtimer
737  * Sets the alarm timer and sleeps until it is fired or interrupted.
739 static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp,  in alarmtimer_do_nsleep()  argument
743 	alarm->data = (void *)current;  in alarmtimer_do_nsleep()
746 		alarm_start(alarm, absexp);  in alarmtimer_do_nsleep()
747 		if (likely(alarm->data))  in alarmtimer_do_nsleep()
750 		alarm_cancel(alarm);  in alarmtimer_do_nsleep()
751 	} while (alarm->data && !signal_pending(current));  in alarmtimer_do_nsleep()
755 	destroy_hrtimer_on_stack(&alarm->timer);  in alarmtimer_do_nsleep()
757 	if (!alarm->data)  in alarmtimer_do_nsleep()
779 alarm_init_on_stack(struct alarm *alarm, enum alarmtimer_type type,  in alarm_init_on_stack()  argument
780 		    enum alarmtimer_restart (*function)(struct alarm *, ktime_t))  in alarm_init_on_stack()  argument
782 	hrtimer_init_on_stack(&alarm->timer, alarm_bases[type].base_clockid,  in alarm_init_on_stack()
784 	__alarm_init(alarm, type, function);  in alarm_init_on_stack()
797 	struct alarm alarm;  in alarm_timer_nsleep_restart()  local
799 	alarm_init_on_stack(&alarm, type, alarmtimer_nsleep_wakeup);  in alarm_timer_nsleep_restart()
801 	return alarmtimer_do_nsleep(&alarm, exp, type);  in alarm_timer_nsleep_restart()
818 	struct alarm alarm;  in alarm_timer_nsleep()  local
831 	alarm_init_on_stack(&alarm, type, alarmtimer_nsleep_wakeup);  in alarm_timer_nsleep()
843 	ret = alarmtimer_do_nsleep(&alarm, exp, type);  in alarm_timer_nsleep()
896  * alarmtimer_init - Initialize alarm timer code
898  * This function initializes the alarm bases and registers
908 	/* Initialize alarm bases */  in alarmtimer_init()