2 * drivers/base/power/wakeup.c - System wakeup events framework
4 * Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
6 * This file is released under the GPLv2.
9 #include <linux/device.h>
10 #include <linux/slab.h>
11 #include <linux/sched.h>
12 #include <linux/capability.h>
13 #include <linux/export.h>
14 #include <linux/suspend.h>
15 #include <linux/seq_file.h>
16 #include <linux/debugfs.h>
17 #include <linux/pm_wakeirq.h>
18 #include <linux/types.h>
19 #include <trace/events/power.h>
24 * If set, the suspend/hibernate code will abort transitions to a sleep state
25 * if wakeup events are registered during or immediately before the transition.
27 bool events_check_enabled __read_mostly;
29 /* First wakeup IRQ seen by the kernel in the last cycle. */
30 unsigned int pm_wakeup_irq __read_mostly;
32 /* If set and the system is suspending, terminate the suspend. */
33 static bool pm_abort_suspend __read_mostly;
36 * Combined counters of registered wakeup events and wakeup events in progress.
37 * They need to be modified together atomically, so it's better to use one
38 * atomic variable to hold them both.
40 static atomic_t combined_event_count = ATOMIC_INIT(0);
42 #define IN_PROGRESS_BITS (sizeof(int) * 4)
43 #define MAX_IN_PROGRESS ((1 << IN_PROGRESS_BITS) - 1)
45 static void split_counters(unsigned int *cnt, unsigned int *inpr)
47 unsigned int comb = atomic_read(&combined_event_count);
49 *cnt = (comb >> IN_PROGRESS_BITS);
50 *inpr = comb & MAX_IN_PROGRESS;
53 /* A preserved old value of the events counter. */
54 static unsigned int saved_count;
56 static DEFINE_SPINLOCK(events_lock);
58 static void pm_wakeup_timer_fn(unsigned long data);
60 static LIST_HEAD(wakeup_sources);
62 static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue);
64 static struct wakeup_source deleted_ws = {
66 .lock = __SPIN_LOCK_UNLOCKED(deleted_ws.lock),
70 * wakeup_source_prepare - Prepare a new wakeup source for initialization.
71 * @ws: Wakeup source to prepare.
72 * @name: Pointer to the name of the new wakeup source.
74 * Callers must ensure that the @name string won't be freed when @ws is still in
77 void wakeup_source_prepare(struct wakeup_source *ws, const char *name)
80 memset(ws, 0, sizeof(*ws));
84 EXPORT_SYMBOL_GPL(wakeup_source_prepare);
87 * wakeup_source_create - Create a struct wakeup_source object.
88 * @name: Name of the new wakeup source.
90 struct wakeup_source *wakeup_source_create(const char *name)
92 struct wakeup_source *ws;
94 ws = kmalloc(sizeof(*ws), GFP_KERNEL);
98 wakeup_source_prepare(ws, name ? kstrdup_const(name, GFP_KERNEL) : NULL);
101 EXPORT_SYMBOL_GPL(wakeup_source_create);
104 * wakeup_source_drop - Prepare a struct wakeup_source object for destruction.
105 * @ws: Wakeup source to prepare for destruction.
107 * Callers must ensure that __pm_stay_awake() or __pm_wakeup_event() will never
108 * be run in parallel with this function for the same wakeup source object.
110 void wakeup_source_drop(struct wakeup_source *ws)
115 del_timer_sync(&ws->timer);
118 EXPORT_SYMBOL_GPL(wakeup_source_drop);
121 * Record wakeup_source statistics being deleted into a dummy wakeup_source.
123 static void wakeup_source_record(struct wakeup_source *ws)
127 spin_lock_irqsave(&deleted_ws.lock, flags);
129 if (ws->event_count) {
130 deleted_ws.total_time =
131 ktime_add(deleted_ws.total_time, ws->total_time);
132 deleted_ws.prevent_sleep_time =
133 ktime_add(deleted_ws.prevent_sleep_time,
134 ws->prevent_sleep_time);
135 deleted_ws.max_time =
136 ktime_compare(deleted_ws.max_time, ws->max_time) > 0 ?
137 deleted_ws.max_time : ws->max_time;
138 deleted_ws.event_count += ws->event_count;
139 deleted_ws.active_count += ws->active_count;
140 deleted_ws.relax_count += ws->relax_count;
141 deleted_ws.expire_count += ws->expire_count;
142 deleted_ws.wakeup_count += ws->wakeup_count;
145 spin_unlock_irqrestore(&deleted_ws.lock, flags);
149 * wakeup_source_destroy - Destroy a struct wakeup_source object.
150 * @ws: Wakeup source to destroy.
152 * Use only for wakeup source objects created with wakeup_source_create().
154 void wakeup_source_destroy(struct wakeup_source *ws)
159 wakeup_source_drop(ws);
160 wakeup_source_record(ws);
161 kfree_const(ws->name);
164 EXPORT_SYMBOL_GPL(wakeup_source_destroy);
167 * wakeup_source_add - Add given object to the list of wakeup sources.
168 * @ws: Wakeup source object to add to the list.
170 void wakeup_source_add(struct wakeup_source *ws)
177 spin_lock_init(&ws->lock);
178 setup_timer(&ws->timer, pm_wakeup_timer_fn, (unsigned long)ws);
180 ws->last_time = ktime_get();
182 spin_lock_irqsave(&events_lock, flags);
183 list_add_rcu(&ws->entry, &wakeup_sources);
184 spin_unlock_irqrestore(&events_lock, flags);
186 EXPORT_SYMBOL_GPL(wakeup_source_add);
189 * wakeup_source_remove - Remove given object from the wakeup sources list.
190 * @ws: Wakeup source object to remove from the list.
192 void wakeup_source_remove(struct wakeup_source *ws)
199 spin_lock_irqsave(&events_lock, flags);
200 list_del_rcu(&ws->entry);
201 spin_unlock_irqrestore(&events_lock, flags);
204 EXPORT_SYMBOL_GPL(wakeup_source_remove);
207 * wakeup_source_register - Create wakeup source and add it to the list.
208 * @name: Name of the wakeup source to register.
210 struct wakeup_source *wakeup_source_register(const char *name)
212 struct wakeup_source *ws;
214 ws = wakeup_source_create(name);
216 wakeup_source_add(ws);
220 EXPORT_SYMBOL_GPL(wakeup_source_register);
223 * wakeup_source_unregister - Remove wakeup source from the list and remove it.
224 * @ws: Wakeup source object to unregister.
226 void wakeup_source_unregister(struct wakeup_source *ws)
229 wakeup_source_remove(ws);
230 wakeup_source_destroy(ws);
233 EXPORT_SYMBOL_GPL(wakeup_source_unregister);
236 * device_wakeup_attach - Attach a wakeup source object to a device object.
237 * @dev: Device to handle.
238 * @ws: Wakeup source object to attach to @dev.
240 * This causes @dev to be treated as a wakeup device.
242 static int device_wakeup_attach(struct device *dev, struct wakeup_source *ws)
244 spin_lock_irq(&dev->power.lock);
245 if (dev->power.wakeup) {
246 spin_unlock_irq(&dev->power.lock);
249 dev->power.wakeup = ws;
250 spin_unlock_irq(&dev->power.lock);
255 * device_wakeup_enable - Enable given device to be a wakeup source.
256 * @dev: Device to handle.
258 * Create a wakeup source object, register it and attach it to @dev.
260 int device_wakeup_enable(struct device *dev)
262 struct wakeup_source *ws;
265 if (!dev || !dev->power.can_wakeup)
268 ws = wakeup_source_register(dev_name(dev));
272 ret = device_wakeup_attach(dev, ws);
274 wakeup_source_unregister(ws);
278 EXPORT_SYMBOL_GPL(device_wakeup_enable);
281 * device_wakeup_attach_irq - Attach a wakeirq to a wakeup source
282 * @dev: Device to handle
283 * @wakeirq: Device specific wakeirq entry
285 * Attach a device wakeirq to the wakeup source so the device
286 * wake IRQ can be configured automatically for suspend and
289 * Call under the device's power.lock lock.
291 int device_wakeup_attach_irq(struct device *dev,
292 struct wake_irq *wakeirq)
294 struct wakeup_source *ws;
296 ws = dev->power.wakeup;
298 dev_err(dev, "forgot to call call device_init_wakeup?\n");
305 ws->wakeirq = wakeirq;
310 * device_wakeup_detach_irq - Detach a wakeirq from a wakeup source
311 * @dev: Device to handle
313 * Removes a device wakeirq from the wakeup source.
315 * Call under the device's power.lock lock.
317 void device_wakeup_detach_irq(struct device *dev)
319 struct wakeup_source *ws;
321 ws = dev->power.wakeup;
327 * device_wakeup_arm_wake_irqs(void)
329 * Itereates over the list of device wakeirqs to arm them.
331 void device_wakeup_arm_wake_irqs(void)
333 struct wakeup_source *ws;
336 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
338 dev_pm_arm_wake_irq(ws->wakeirq);
344 * device_wakeup_disarm_wake_irqs(void)
346 * Itereates over the list of device wakeirqs to disarm them.
348 void device_wakeup_disarm_wake_irqs(void)
350 struct wakeup_source *ws;
353 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
355 dev_pm_disarm_wake_irq(ws->wakeirq);
361 * device_wakeup_detach - Detach a device's wakeup source object from it.
362 * @dev: Device to detach the wakeup source object from.
364 * After it returns, @dev will not be treated as a wakeup device any more.
366 static struct wakeup_source *device_wakeup_detach(struct device *dev)
368 struct wakeup_source *ws;
370 spin_lock_irq(&dev->power.lock);
371 ws = dev->power.wakeup;
372 dev->power.wakeup = NULL;
373 spin_unlock_irq(&dev->power.lock);
378 * device_wakeup_disable - Do not regard a device as a wakeup source any more.
379 * @dev: Device to handle.
381 * Detach the @dev's wakeup source object from it, unregister this wakeup source
382 * object and destroy it.
384 int device_wakeup_disable(struct device *dev)
386 struct wakeup_source *ws;
388 if (!dev || !dev->power.can_wakeup)
391 ws = device_wakeup_detach(dev);
393 wakeup_source_unregister(ws);
397 EXPORT_SYMBOL_GPL(device_wakeup_disable);
400 * device_set_wakeup_capable - Set/reset device wakeup capability flag.
401 * @dev: Device to handle.
402 * @capable: Whether or not @dev is capable of waking up the system from sleep.
404 * If @capable is set, set the @dev's power.can_wakeup flag and add its
405 * wakeup-related attributes to sysfs. Otherwise, unset the @dev's
406 * power.can_wakeup flag and remove its wakeup-related attributes from sysfs.
408 * This function may sleep and it can't be called from any context where
409 * sleeping is not allowed.
411 void device_set_wakeup_capable(struct device *dev, bool capable)
413 if (!!dev->power.can_wakeup == !!capable)
416 if (device_is_registered(dev) && !list_empty(&dev->power.entry)) {
418 if (wakeup_sysfs_add(dev))
421 wakeup_sysfs_remove(dev);
424 dev->power.can_wakeup = capable;
426 EXPORT_SYMBOL_GPL(device_set_wakeup_capable);
429 * device_init_wakeup - Device wakeup initialization.
430 * @dev: Device to handle.
431 * @enable: Whether or not to enable @dev as a wakeup device.
433 * By default, most devices should leave wakeup disabled. The exceptions are
434 * devices that everyone expects to be wakeup sources: keyboards, power buttons,
435 * possibly network interfaces, etc. Also, devices that don't generate their
436 * own wakeup requests but merely forward requests from one bus to another
437 * (like PCI bridges) should have wakeup enabled by default.
439 int device_init_wakeup(struct device *dev, bool enable)
447 device_set_wakeup_capable(dev, true);
448 ret = device_wakeup_enable(dev);
450 if (dev->power.can_wakeup)
451 device_wakeup_disable(dev);
453 device_set_wakeup_capable(dev, false);
458 EXPORT_SYMBOL_GPL(device_init_wakeup);
461 * device_set_wakeup_enable - Enable or disable a device to wake up the system.
462 * @dev: Device to handle.
464 int device_set_wakeup_enable(struct device *dev, bool enable)
466 if (!dev || !dev->power.can_wakeup)
469 return enable ? device_wakeup_enable(dev) : device_wakeup_disable(dev);
471 EXPORT_SYMBOL_GPL(device_set_wakeup_enable);
474 * wakeup_source_not_registered - validate the given wakeup source.
475 * @ws: Wakeup source to be validated.
477 static bool wakeup_source_not_registered(struct wakeup_source *ws)
480 * Use timer struct to check if the given source is initialized
481 * by wakeup_source_add.
483 return ws->timer.function != pm_wakeup_timer_fn ||
484 ws->timer.data != (unsigned long)ws;
488 * The functions below use the observation that each wakeup event starts a
489 * period in which the system should not be suspended. The moment this period
490 * will end depends on how the wakeup event is going to be processed after being
491 * detected and all of the possible cases can be divided into two distinct
494 * First, a wakeup event may be detected by the same functional unit that will
495 * carry out the entire processing of it and possibly will pass it to user space
496 * for further processing. In that case the functional unit that has detected
497 * the event may later "close" the "no suspend" period associated with it
498 * directly as soon as it has been dealt with. The pair of pm_stay_awake() and
499 * pm_relax(), balanced with each other, is supposed to be used in such
502 * Second, a wakeup event may be detected by one functional unit and processed
503 * by another one. In that case the unit that has detected it cannot really
504 * "close" the "no suspend" period associated with it, unless it knows in
505 * advance what's going to happen to the event during processing. This
506 * knowledge, however, may not be available to it, so it can simply specify time
507 * to wait before the system can be suspended and pass it as the second
508 * argument of pm_wakeup_event().
510 * It is valid to call pm_relax() after pm_wakeup_event(), in which case the
511 * "no suspend" period will be ended either by the pm_relax(), or by the timer
512 * function executed when the timer expires, whichever comes first.
516 * wakup_source_activate - Mark given wakeup source as active.
517 * @ws: Wakeup source to handle.
519 * Update the @ws' statistics and, if @ws has just been activated, notify the PM
520 * core of the event by incrementing the counter of of wakeup events being
523 static void wakeup_source_activate(struct wakeup_source *ws)
527 if (WARN_ONCE(wakeup_source_not_registered(ws),
528 "unregistered wakeup source\n"))
532 * active wakeup source should bring the system
533 * out of PM_SUSPEND_FREEZE state
539 ws->last_time = ktime_get();
540 if (ws->autosleep_enabled)
541 ws->start_prevent_time = ws->last_time;
543 /* Increment the counter of events in progress. */
544 cec = atomic_inc_return(&combined_event_count);
546 trace_wakeup_source_activate(ws->name, cec);
550 * wakeup_source_report_event - Report wakeup event using the given source.
551 * @ws: Wakeup source to report the event for.
553 static void wakeup_source_report_event(struct wakeup_source *ws)
556 /* This is racy, but the counter is approximate anyway. */
557 if (events_check_enabled)
561 wakeup_source_activate(ws);
565 * __pm_stay_awake - Notify the PM core of a wakeup event.
566 * @ws: Wakeup source object associated with the source of the event.
568 * It is safe to call this function from interrupt context.
570 void __pm_stay_awake(struct wakeup_source *ws)
577 spin_lock_irqsave(&ws->lock, flags);
579 wakeup_source_report_event(ws);
580 del_timer(&ws->timer);
581 ws->timer_expires = 0;
583 spin_unlock_irqrestore(&ws->lock, flags);
585 EXPORT_SYMBOL_GPL(__pm_stay_awake);
588 * pm_stay_awake - Notify the PM core that a wakeup event is being processed.
589 * @dev: Device the wakeup event is related to.
591 * Notify the PM core of a wakeup event (signaled by @dev) by calling
592 * __pm_stay_awake for the @dev's wakeup source object.
594 * Call this function after detecting of a wakeup event if pm_relax() is going
595 * to be called directly after processing the event (and possibly passing it to
596 * user space for further processing).
598 void pm_stay_awake(struct device *dev)
605 spin_lock_irqsave(&dev->power.lock, flags);
606 __pm_stay_awake(dev->power.wakeup);
607 spin_unlock_irqrestore(&dev->power.lock, flags);
609 EXPORT_SYMBOL_GPL(pm_stay_awake);
611 #ifdef CONFIG_PM_AUTOSLEEP
612 static void update_prevent_sleep_time(struct wakeup_source *ws, ktime_t now)
614 ktime_t delta = ktime_sub(now, ws->start_prevent_time);
615 ws->prevent_sleep_time = ktime_add(ws->prevent_sleep_time, delta);
618 static inline void update_prevent_sleep_time(struct wakeup_source *ws,
623 * wakup_source_deactivate - Mark given wakeup source as inactive.
624 * @ws: Wakeup source to handle.
626 * Update the @ws' statistics and notify the PM core that the wakeup source has
627 * become inactive by decrementing the counter of wakeup events being processed
628 * and incrementing the counter of registered wakeup events.
630 static void wakeup_source_deactivate(struct wakeup_source *ws)
632 unsigned int cnt, inpr, cec;
638 * __pm_relax() may be called directly or from a timer function.
639 * If it is called directly right after the timer function has been
640 * started, but before the timer function calls __pm_relax(), it is
641 * possible that __pm_stay_awake() will be called in the meantime and
642 * will set ws->active. Then, ws->active may be cleared immediately
643 * by the __pm_relax() called from the timer function, but in such a
644 * case ws->relax_count will be different from ws->active_count.
646 if (ws->relax_count != ws->active_count) {
654 duration = ktime_sub(now, ws->last_time);
655 ws->total_time = ktime_add(ws->total_time, duration);
656 if (ktime_to_ns(duration) > ktime_to_ns(ws->max_time))
657 ws->max_time = duration;
660 del_timer(&ws->timer);
661 ws->timer_expires = 0;
663 if (ws->autosleep_enabled)
664 update_prevent_sleep_time(ws, now);
667 * Increment the counter of registered wakeup events and decrement the
668 * couter of wakeup events in progress simultaneously.
670 cec = atomic_add_return(MAX_IN_PROGRESS, &combined_event_count);
671 trace_wakeup_source_deactivate(ws->name, cec);
673 split_counters(&cnt, &inpr);
674 if (!inpr && waitqueue_active(&wakeup_count_wait_queue))
675 wake_up(&wakeup_count_wait_queue);
679 * __pm_relax - Notify the PM core that processing of a wakeup event has ended.
680 * @ws: Wakeup source object associated with the source of the event.
682 * Call this function for wakeup events whose processing started with calling
685 * It is safe to call it from interrupt context.
687 void __pm_relax(struct wakeup_source *ws)
694 spin_lock_irqsave(&ws->lock, flags);
696 wakeup_source_deactivate(ws);
697 spin_unlock_irqrestore(&ws->lock, flags);
699 EXPORT_SYMBOL_GPL(__pm_relax);
702 * pm_relax - Notify the PM core that processing of a wakeup event has ended.
703 * @dev: Device that signaled the event.
705 * Execute __pm_relax() for the @dev's wakeup source object.
707 void pm_relax(struct device *dev)
714 spin_lock_irqsave(&dev->power.lock, flags);
715 __pm_relax(dev->power.wakeup);
716 spin_unlock_irqrestore(&dev->power.lock, flags);
718 EXPORT_SYMBOL_GPL(pm_relax);
721 * pm_wakeup_timer_fn - Delayed finalization of a wakeup event.
722 * @data: Address of the wakeup source object associated with the event source.
724 * Call wakeup_source_deactivate() for the wakeup source whose address is stored
725 * in @data if it is currently active and its timer has not been canceled and
726 * the expiration time of the timer is not in future.
728 static void pm_wakeup_timer_fn(unsigned long data)
730 struct wakeup_source *ws = (struct wakeup_source *)data;
733 spin_lock_irqsave(&ws->lock, flags);
735 if (ws->active && ws->timer_expires
736 && time_after_eq(jiffies, ws->timer_expires)) {
737 wakeup_source_deactivate(ws);
741 spin_unlock_irqrestore(&ws->lock, flags);
745 * __pm_wakeup_event - Notify the PM core of a wakeup event.
746 * @ws: Wakeup source object associated with the event source.
747 * @msec: Anticipated event processing time (in milliseconds).
749 * Notify the PM core of a wakeup event whose source is @ws that will take
750 * approximately @msec milliseconds to be processed by the kernel. If @ws is
751 * not active, activate it. If @msec is nonzero, set up the @ws' timer to
752 * execute pm_wakeup_timer_fn() in future.
754 * It is safe to call this function from interrupt context.
756 void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec)
759 unsigned long expires;
764 spin_lock_irqsave(&ws->lock, flags);
766 wakeup_source_report_event(ws);
769 wakeup_source_deactivate(ws);
773 expires = jiffies + msecs_to_jiffies(msec);
777 if (!ws->timer_expires || time_after(expires, ws->timer_expires)) {
778 mod_timer(&ws->timer, expires);
779 ws->timer_expires = expires;
783 spin_unlock_irqrestore(&ws->lock, flags);
785 EXPORT_SYMBOL_GPL(__pm_wakeup_event);
789 * pm_wakeup_event - Notify the PM core of a wakeup event.
790 * @dev: Device the wakeup event is related to.
791 * @msec: Anticipated event processing time (in milliseconds).
793 * Call __pm_wakeup_event() for the @dev's wakeup source object.
795 void pm_wakeup_event(struct device *dev, unsigned int msec)
802 spin_lock_irqsave(&dev->power.lock, flags);
803 __pm_wakeup_event(dev->power.wakeup, msec);
804 spin_unlock_irqrestore(&dev->power.lock, flags);
806 EXPORT_SYMBOL_GPL(pm_wakeup_event);
808 void pm_get_active_wakeup_sources(char *pending_wakeup_source, size_t max)
810 struct wakeup_source *ws, *last_active_ws = NULL;
815 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
818 len += scnprintf(pending_wakeup_source, max,
819 "Pending Wakeup Sources: ");
820 len += scnprintf(pending_wakeup_source + len, max - len,
823 } else if (!active &&
825 ktime_to_ns(ws->last_time) >
826 ktime_to_ns(last_active_ws->last_time))) {
830 if (!active && last_active_ws) {
831 scnprintf(pending_wakeup_source, max,
832 "Last active Wakeup Source: %s",
833 last_active_ws->name);
837 EXPORT_SYMBOL_GPL(pm_get_active_wakeup_sources);
839 void pm_print_active_wakeup_sources(void)
841 struct wakeup_source *ws;
843 struct wakeup_source *last_activity_ws = NULL;
846 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
848 pr_info("active wakeup source: %s\n", ws->name);
850 } else if (!active &&
851 (!last_activity_ws ||
852 ktime_to_ns(ws->last_time) >
853 ktime_to_ns(last_activity_ws->last_time))) {
854 last_activity_ws = ws;
858 if (!active && last_activity_ws)
859 pr_info("last active wakeup source: %s\n",
860 last_activity_ws->name);
863 EXPORT_SYMBOL_GPL(pm_print_active_wakeup_sources);
866 * pm_wakeup_pending - Check if power transition in progress should be aborted.
868 * Compare the current number of registered wakeup events with its preserved
869 * value from the past and return true if new wakeup events have been registered
870 * since the old value was stored. Also return true if the current number of
871 * wakeup events being processed is different from zero.
873 bool pm_wakeup_pending(void)
878 spin_lock_irqsave(&events_lock, flags);
879 if (events_check_enabled) {
880 unsigned int cnt, inpr;
882 split_counters(&cnt, &inpr);
883 ret = (cnt != saved_count || inpr > 0);
884 events_check_enabled = !ret;
886 spin_unlock_irqrestore(&events_lock, flags);
889 pr_info("PM: Wakeup pending, aborting suspend\n");
890 pm_print_active_wakeup_sources();
893 return ret || pm_abort_suspend;
896 void pm_system_wakeup(void)
898 pm_abort_suspend = true;
901 EXPORT_SYMBOL_GPL(pm_system_wakeup);
903 void pm_wakeup_clear(void)
905 pm_abort_suspend = false;
909 void pm_system_irq_wakeup(unsigned int irq_number)
911 if (pm_wakeup_irq == 0) {
912 pm_wakeup_irq = irq_number;
918 * pm_get_wakeup_count - Read the number of registered wakeup events.
919 * @count: Address to store the value at.
920 * @block: Whether or not to block.
922 * Store the number of registered wakeup events at the address in @count. If
923 * @block is set, block until the current number of wakeup events being
926 * Return 'false' if the current number of wakeup events being processed is
927 * nonzero. Otherwise return 'true'.
929 bool pm_get_wakeup_count(unsigned int *count, bool block)
931 unsigned int cnt, inpr;
937 prepare_to_wait(&wakeup_count_wait_queue, &wait,
939 split_counters(&cnt, &inpr);
940 if (inpr == 0 || signal_pending(current))
945 finish_wait(&wakeup_count_wait_queue, &wait);
948 split_counters(&cnt, &inpr);
954 * pm_save_wakeup_count - Save the current number of registered wakeup events.
955 * @count: Value to compare with the current number of registered wakeup events.
957 * If @count is equal to the current number of registered wakeup events and the
958 * current number of wakeup events being processed is zero, store @count as the
959 * old number of registered wakeup events for pm_check_wakeup_events(), enable
960 * wakeup events detection and return 'true'. Otherwise disable wakeup events
961 * detection and return 'false'.
963 bool pm_save_wakeup_count(unsigned int count)
965 unsigned int cnt, inpr;
968 events_check_enabled = false;
969 spin_lock_irqsave(&events_lock, flags);
970 split_counters(&cnt, &inpr);
971 if (cnt == count && inpr == 0) {
973 events_check_enabled = true;
975 spin_unlock_irqrestore(&events_lock, flags);
976 return events_check_enabled;
979 #ifdef CONFIG_PM_AUTOSLEEP
981 * pm_wakep_autosleep_enabled - Modify autosleep_enabled for all wakeup sources.
982 * @enabled: Whether to set or to clear the autosleep_enabled flags.
984 void pm_wakep_autosleep_enabled(bool set)
986 struct wakeup_source *ws;
987 ktime_t now = ktime_get();
990 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
991 spin_lock_irq(&ws->lock);
992 if (ws->autosleep_enabled != set) {
993 ws->autosleep_enabled = set;
996 ws->start_prevent_time = now;
998 update_prevent_sleep_time(ws, now);
1001 spin_unlock_irq(&ws->lock);
1005 #endif /* CONFIG_PM_AUTOSLEEP */
1007 static struct dentry *wakeup_sources_stats_dentry;
1010 * print_wakeup_source_stats - Print wakeup source statistics information.
1011 * @m: seq_file to print the statistics into.
1012 * @ws: Wakeup source object to print the statistics for.
1014 static int print_wakeup_source_stats(struct seq_file *m,
1015 struct wakeup_source *ws)
1017 unsigned long flags;
1020 unsigned long active_count;
1021 ktime_t active_time;
1022 ktime_t prevent_sleep_time;
1024 spin_lock_irqsave(&ws->lock, flags);
1026 total_time = ws->total_time;
1027 max_time = ws->max_time;
1028 prevent_sleep_time = ws->prevent_sleep_time;
1029 active_count = ws->active_count;
1031 ktime_t now = ktime_get();
1033 active_time = ktime_sub(now, ws->last_time);
1034 total_time = ktime_add(total_time, active_time);
1035 if (active_time.tv64 > max_time.tv64)
1036 max_time = active_time;
1038 if (ws->autosleep_enabled)
1039 prevent_sleep_time = ktime_add(prevent_sleep_time,
1040 ktime_sub(now, ws->start_prevent_time));
1042 active_time = ktime_set(0, 0);
1045 seq_printf(m, "%-12s\t%lu\t\t%lu\t\t%lu\t\t%lu\t\t%lld\t\t%lld\t\t%lld\t\t%lld\t\t%lld\n",
1046 ws->name, active_count, ws->event_count,
1047 ws->wakeup_count, ws->expire_count,
1048 ktime_to_ms(active_time), ktime_to_ms(total_time),
1049 ktime_to_ms(max_time), ktime_to_ms(ws->last_time),
1050 ktime_to_ms(prevent_sleep_time));
1052 spin_unlock_irqrestore(&ws->lock, flags);
1058 * wakeup_sources_stats_show - Print wakeup sources statistics information.
1059 * @m: seq_file to print the statistics into.
1061 static int wakeup_sources_stats_show(struct seq_file *m, void *unused)
1063 struct wakeup_source *ws;
1065 seq_puts(m, "name\t\tactive_count\tevent_count\twakeup_count\t"
1066 "expire_count\tactive_since\ttotal_time\tmax_time\t"
1067 "last_change\tprevent_suspend_time\n");
1070 list_for_each_entry_rcu(ws, &wakeup_sources, entry)
1071 print_wakeup_source_stats(m, ws);
1074 print_wakeup_source_stats(m, &deleted_ws);
1079 static int wakeup_sources_stats_open(struct inode *inode, struct file *file)
1081 return single_open(file, wakeup_sources_stats_show, NULL);
1084 static const struct file_operations wakeup_sources_stats_fops = {
1085 .owner = THIS_MODULE,
1086 .open = wakeup_sources_stats_open,
1088 .llseek = seq_lseek,
1089 .release = single_release,
1092 static int __init wakeup_sources_debugfs_init(void)
1094 wakeup_sources_stats_dentry = debugfs_create_file("wakeup_sources",
1095 S_IRUGO, NULL, NULL, &wakeup_sources_stats_fops);
1099 postcore_initcall(wakeup_sources_debugfs_init);