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 */
151  * alarmtimer_enqueue - Adds an alarm timer to an alarm_base timerqueue
153  * @alarm: pointer to alarm being enqueued.
155  * Adds alarm to a alarm_base timerqueue
159 static void alarmtimer_enqueue(struct alarm_base *base, struct alarm *alarm)  in alarmtimer_enqueue()  argument
161 	if (alarm->state & ALARMTIMER_STATE_ENQUEUED)  in alarmtimer_enqueue()
162 		timerqueue_del(&base->timerqueue, &alarm->node);  in alarmtimer_enqueue()
164 	timerqueue_add(&base->timerqueue, &alarm->node);  in alarmtimer_enqueue()
165 	alarm->state |= ALARMTIMER_STATE_ENQUEUED;  in alarmtimer_enqueue()
169  * alarmtimer_dequeue - Removes an alarm timer from an alarm_base timerqueue
171  * @alarm: pointer to alarm being removed
173  * Removes alarm to a alarm_base timerqueue
177 static void alarmtimer_dequeue(struct alarm_base *base, struct alarm *alarm)  in alarmtimer_dequeue()  argument
179 	if (!(alarm->state & ALARMTIMER_STATE_ENQUEUED))  in alarmtimer_dequeue()
182 	timerqueue_del(&base->timerqueue, &alarm->node);  in alarmtimer_dequeue()
183 	alarm->state &= ~ALARMTIMER_STATE_ENQUEUED;  in alarmtimer_dequeue()
188  * alarmtimer_fired - Handles alarm hrtimer being fired.
191  * When a alarm timer fires, this runs through the timerqueue to
192  * see which alarms expired, and runs those. If there are more alarm
194  * the next future alarm timer expires.
198 	struct alarm *alarm = container_of(timer, struct alarm, timer);  in alarmtimer_fired()  local
199 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarmtimer_fired()
205 	alarmtimer_dequeue(base, alarm);  in alarmtimer_fired()
208 	if (alarm->function)  in alarmtimer_fired()
209 		restart = alarm->function(alarm, base->get_ktime());  in alarmtimer_fired()
213 		hrtimer_set_expires(&alarm->timer, alarm->node.expires);  in alarmtimer_fired()
214 		alarmtimer_enqueue(base, alarm);  in alarmtimer_fired()
219 	trace_alarmtimer_fired(alarm, base->get_ktime());  in alarmtimer_fired()
224 ktime_t alarm_expires_remaining(const struct alarm *alarm)  in alarm_expires_remaining()  argument
226 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_expires_remaining()
227 	return ktime_sub(alarm->node.expires, base->get_ktime());  in alarm_expires_remaining()
295 	 * If the RTC alarm timer only supports a limited time offset, set the  in alarmtimer_suspend()
296 	 * alarm time to the maximum supported value.  in alarmtimer_suspend()
306 	/* Set alarm, if in the past reject suspend briefly to handle */  in alarmtimer_suspend()
336 __alarm_init(struct alarm *alarm, enum alarmtimer_type type,  in __alarm_init()  argument
337 	     enum alarmtimer_restart (*function)(struct alarm *, ktime_t))  in __alarm_init()  argument
339 	timerqueue_init(&alarm->node);  in __alarm_init()
340 	alarm->timer.function = alarmtimer_fired;  in __alarm_init()
341 	alarm->function = function;  in __alarm_init()
342 	alarm->type = type;  in __alarm_init()
343 	alarm->state = ALARMTIMER_STATE_INACTIVE;  in __alarm_init()
347  * alarm_init - Initialize an alarm structure
348  * @alarm: ptr to alarm to be initialized
349  * @type: the type of the alarm
350  * @function: callback that is run when the alarm fires
352 void alarm_init(struct alarm *alarm, enum alarmtimer_type type,  in alarm_init()  argument
353 		enum alarmtimer_restart (*function)(struct alarm *, ktime_t))  in alarm_init()  argument
355 	hrtimer_init(&alarm->timer, alarm_bases[type].base_clockid,  in alarm_init()
357 	__alarm_init(alarm, type, function);  in alarm_init()
362  * alarm_start - Sets an absolute alarm to fire
363  * @alarm: ptr to alarm to set
364  * @start: time to run the alarm
366 void alarm_start(struct alarm *alarm, ktime_t start)  in alarm_start()  argument
368 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_start()
372 	alarm->node.expires = start;  in alarm_start()
373 	alarmtimer_enqueue(base, alarm);  in alarm_start()
374 	hrtimer_start(&alarm->timer, alarm->node.expires, HRTIMER_MODE_ABS);  in alarm_start()
377 	trace_alarmtimer_start(alarm, base->get_ktime());  in alarm_start()
382  * alarm_start_relative - Sets a relative alarm to fire
383  * @alarm: ptr to alarm to set
384  * @start: time relative to now to run the alarm
386 void alarm_start_relative(struct alarm *alarm, ktime_t start)  in alarm_start_relative()  argument
388 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_start_relative()
391 	alarm_start(alarm, start);  in alarm_start_relative()
395 void alarm_restart(struct alarm *alarm)  in alarm_restart()  argument
397 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_restart()
401 	hrtimer_set_expires(&alarm->timer, alarm->node.expires);  in alarm_restart()
402 	hrtimer_restart(&alarm->timer);  in alarm_restart()
403 	alarmtimer_enqueue(base, alarm);  in alarm_restart()
409  * alarm_try_to_cancel - Tries to cancel an alarm timer
410  * @alarm: ptr to alarm to be canceled
415 int alarm_try_to_cancel(struct alarm *alarm)  in alarm_try_to_cancel()  argument
417 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_try_to_cancel()
422 	ret = hrtimer_try_to_cancel(&alarm->timer);  in alarm_try_to_cancel()
424 		alarmtimer_dequeue(base, alarm);  in alarm_try_to_cancel()
427 	trace_alarmtimer_cancel(alarm, base->get_ktime());  in alarm_try_to_cancel()
434  * alarm_cancel - Spins trying to cancel an alarm timer until it is done
435  * @alarm: ptr to alarm to be canceled
439 int alarm_cancel(struct alarm *alarm)  in alarm_cancel()  argument
442 		int ret = alarm_try_to_cancel(alarm);  in alarm_cancel()
445 		hrtimer_cancel_wait_running(&alarm->timer);  in alarm_cancel()
451 u64 alarm_forward(struct alarm *alarm, ktime_t now, ktime_t interval)  in alarm_forward()  argument
456 	delta = ktime_sub(now, alarm->node.expires);  in alarm_forward()
466 		alarm->node.expires = ktime_add_ns(alarm->node.expires,  in alarm_forward()
469 		if (alarm->node.expires > now)  in alarm_forward()
478 	alarm->node.expires = ktime_add_safe(alarm->node.expires, interval);  in alarm_forward()
483 static u64 __alarm_forward_now(struct alarm *alarm, ktime_t interval, bool throttle)  in __alarm_forward_now()  argument
485 	struct alarm_base *base = &alarm_bases[alarm->type];  in __alarm_forward_now()
506 	return alarm_forward(alarm, now, interval);  in __alarm_forward_now()
509 u64 alarm_forward_now(struct alarm *alarm, ktime_t interval)  in alarm_forward_now()  argument
511 	return __alarm_forward_now(alarm, interval, false);  in alarm_forward_now()
533 		WARN_ONCE(1, "Invalid alarm type: %d\n", type);  in alarmtimer_freezerset()
563  * @alarm: alarm that fired
566  * Posix timer callback for expired alarm timers.
570 static enum alarmtimer_restart alarm_handle_timer(struct alarm *alarm,  in alarm_handle_timer()  argument
573 	struct k_itimer *ptr = container_of(alarm, struct k_itimer,  in alarm_handle_timer()
574 					    it.alarm.alarmtimer);  in alarm_handle_timer()
591 		ptr->it_overrun += __alarm_forward_now(alarm, ptr->it_interval, true);  in alarm_handle_timer()
607 	struct alarm *alarm = &timr->it.alarm.alarmtimer;  in alarm_timer_rearm()  local
609 	timr->it_overrun += alarm_forward_now(alarm, timr->it_interval);  in alarm_timer_rearm()
610 	alarm_start(alarm, alarm->node.expires);  in alarm_timer_rearm()
620 	struct alarm *alarm = &timr->it.alarm.alarmtimer;  in alarm_timer_forward()  local
622 	return alarm_forward(alarm, timr->it_interval, now);  in alarm_timer_forward()
632 	struct alarm *alarm = &timr->it.alarm.alarmtimer;  in alarm_timer_remaining()  local
634 	return ktime_sub(alarm->node.expires, now);  in alarm_timer_remaining()
643 	return alarm_try_to_cancel(&timr->it.alarm.alarmtimer);  in alarm_timer_try_to_cancel()
656 	hrtimer_cancel_wait_running(&timr->it.alarm.alarmtimer.timer);  in alarm_timer_wait_running()
669 	struct alarm *alarm = &timr->it.alarm.alarmtimer;  in alarm_timer_arm()  local
670 	struct alarm_base *base = &alarm_bases[alarm->type];  in alarm_timer_arm()
675 		alarm->node.expires = expires;  in alarm_timer_arm()
677 		alarm_start(&timr->it.alarm.alarmtimer, expires);  in alarm_timer_arm()
685  * Returns the granularity of underlying alarm base clock
702  * Provides the underlying alarm base time in a tasks time namespace.
720  * Provides the underlying alarm base time in the root namespace.
749 	alarm_init(&new_timer->it.alarm.alarmtimer, type, alarm_handle_timer);  in alarm_timer_create()
755  * @alarm: ptr to alarm that fired
762 static enum alarmtimer_restart alarmtimer_nsleep_wakeup(struct alarm *alarm,  in alarmtimer_nsleep_wakeup()  argument
765 	struct task_struct *task = alarm->data;  in alarmtimer_nsleep_wakeup()
767 	alarm->data = NULL;  in alarmtimer_nsleep_wakeup()
775  * @alarm: ptr to alarmtimer
777  * @type: alarm type (BOOTTIME/REALTIME).
779  * Sets the alarm timer and sleeps until it is fired or interrupted.
781 static int alarmtimer_do_nsleep(struct alarm *alarm, ktime_t absexp,  in alarmtimer_do_nsleep()  argument
785 	alarm->data = (void *)current;  in alarmtimer_do_nsleep()
788 		alarm_start(alarm, absexp);  in alarmtimer_do_nsleep()
789 		if (likely(alarm->data))  in alarmtimer_do_nsleep()
792 		alarm_cancel(alarm);  in alarmtimer_do_nsleep()
793 	} while (alarm->data && !signal_pending(current));  in alarmtimer_do_nsleep()
797 	destroy_hrtimer_on_stack(&alarm->timer);  in alarmtimer_do_nsleep()
799 	if (!alarm->data)  in alarmtimer_do_nsleep()
821 alarm_init_on_stack(struct alarm *alarm, enum alarmtimer_type type,  in alarm_init_on_stack()  argument
822 		    enum alarmtimer_restart (*function)(struct alarm *, ktime_t))  in alarm_init_on_stack()  argument
824 	hrtimer_init_on_stack(&alarm->timer, alarm_bases[type].base_clockid,  in alarm_init_on_stack()
826 	__alarm_init(alarm, type, function);  in alarm_init_on_stack()
839 	struct alarm alarm;  in alarm_timer_nsleep_restart()  local
841 	alarm_init_on_stack(&alarm, type, alarmtimer_nsleep_wakeup);  in alarm_timer_nsleep_restart()
843 	return alarmtimer_do_nsleep(&alarm, exp, type);  in alarm_timer_nsleep_restart()
859 	struct alarm alarm;  in alarm_timer_nsleep()  local
872 	alarm_init_on_stack(&alarm, type, alarmtimer_nsleep_wakeup);  in alarm_timer_nsleep()
884 	ret = alarmtimer_do_nsleep(&alarm, exp, type);  in alarm_timer_nsleep()
937  * alarmtimer_init - Initialize alarm timer code
939  * This function initializes the alarm bases and registers
949 	/* Initialize alarm bases */  in alarmtimer_init()