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 <trace/events/power.h>
23 * If set, the suspend/hibernate code will abort transitions to a sleep state
24 * if wakeup events are registered during or immediately before the transition.
26 bool events_check_enabled __read_mostly;
28 /* First wakeup IRQ seen by the kernel in the last cycle. */
29 unsigned int pm_wakeup_irq __read_mostly;
31 /* If set and the system is suspending, terminate the suspend. */
32 static bool pm_abort_suspend __read_mostly;
35 * Combined counters of registered wakeup events and wakeup events in progress.
36 * They need to be modified together atomically, so it's better to use one
37 * atomic variable to hold them both.
39 static atomic_t combined_event_count = ATOMIC_INIT(0);
41 #define IN_PROGRESS_BITS (sizeof(int) * 4)
42 #define MAX_IN_PROGRESS ((1 << IN_PROGRESS_BITS) - 1)
44 static void split_counters(unsigned int *cnt, unsigned int *inpr)
46 unsigned int comb = atomic_read(&combined_event_count);
48 *cnt = (comb >> IN_PROGRESS_BITS);
49 *inpr = comb & MAX_IN_PROGRESS;
52 /* A preserved old value of the events counter. */
53 static unsigned int saved_count;
55 static DEFINE_SPINLOCK(events_lock);
57 static void pm_wakeup_timer_fn(unsigned long data);
59 static LIST_HEAD(wakeup_sources);
61 static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue);
63 static struct wakeup_source deleted_ws = {
65 .lock = __SPIN_LOCK_UNLOCKED(deleted_ws.lock),
69 * wakeup_source_prepare - Prepare a new wakeup source for initialization.
70 * @ws: Wakeup source to prepare.
71 * @name: Pointer to the name of the new wakeup source.
73 * Callers must ensure that the @name string won't be freed when @ws is still in
76 void wakeup_source_prepare(struct wakeup_source *ws, const char *name)
79 memset(ws, 0, sizeof(*ws));
83 EXPORT_SYMBOL_GPL(wakeup_source_prepare);
86 * wakeup_source_create - Create a struct wakeup_source object.
87 * @name: Name of the new wakeup source.
89 struct wakeup_source *wakeup_source_create(const char *name)
91 struct wakeup_source *ws;
93 ws = kmalloc(sizeof(*ws), GFP_KERNEL);
97 wakeup_source_prepare(ws, name ? kstrdup_const(name, GFP_KERNEL) : NULL);
100 EXPORT_SYMBOL_GPL(wakeup_source_create);
103 * wakeup_source_drop - Prepare a struct wakeup_source object for destruction.
104 * @ws: Wakeup source to prepare for destruction.
106 * Callers must ensure that __pm_stay_awake() or __pm_wakeup_event() will never
107 * be run in parallel with this function for the same wakeup source object.
109 void wakeup_source_drop(struct wakeup_source *ws)
114 del_timer_sync(&ws->timer);
117 EXPORT_SYMBOL_GPL(wakeup_source_drop);
120 * Record wakeup_source statistics being deleted into a dummy wakeup_source.
122 static void wakeup_source_record(struct wakeup_source *ws)
126 spin_lock_irqsave(&deleted_ws.lock, flags);
128 if (ws->event_count) {
129 deleted_ws.total_time =
130 ktime_add(deleted_ws.total_time, ws->total_time);
131 deleted_ws.prevent_sleep_time =
132 ktime_add(deleted_ws.prevent_sleep_time,
133 ws->prevent_sleep_time);
134 deleted_ws.max_time =
135 ktime_compare(deleted_ws.max_time, ws->max_time) > 0 ?
136 deleted_ws.max_time : ws->max_time;
137 deleted_ws.event_count += ws->event_count;
138 deleted_ws.active_count += ws->active_count;
139 deleted_ws.relax_count += ws->relax_count;
140 deleted_ws.expire_count += ws->expire_count;
141 deleted_ws.wakeup_count += ws->wakeup_count;
144 spin_unlock_irqrestore(&deleted_ws.lock, flags);
148 * wakeup_source_destroy - Destroy a struct wakeup_source object.
149 * @ws: Wakeup source to destroy.
151 * Use only for wakeup source objects created with wakeup_source_create().
153 void wakeup_source_destroy(struct wakeup_source *ws)
158 wakeup_source_drop(ws);
159 wakeup_source_record(ws);
160 kfree_const(ws->name);
163 EXPORT_SYMBOL_GPL(wakeup_source_destroy);
166 * wakeup_source_add - Add given object to the list of wakeup sources.
167 * @ws: Wakeup source object to add to the list.
169 void wakeup_source_add(struct wakeup_source *ws)
176 spin_lock_init(&ws->lock);
177 setup_timer(&ws->timer, pm_wakeup_timer_fn, (unsigned long)ws);
179 ws->last_time = ktime_get();
181 spin_lock_irqsave(&events_lock, flags);
182 list_add_rcu(&ws->entry, &wakeup_sources);
183 spin_unlock_irqrestore(&events_lock, flags);
185 EXPORT_SYMBOL_GPL(wakeup_source_add);
188 * wakeup_source_remove - Remove given object from the wakeup sources list.
189 * @ws: Wakeup source object to remove from the list.
191 void wakeup_source_remove(struct wakeup_source *ws)
198 spin_lock_irqsave(&events_lock, flags);
199 list_del_rcu(&ws->entry);
200 spin_unlock_irqrestore(&events_lock, flags);
203 EXPORT_SYMBOL_GPL(wakeup_source_remove);
206 * wakeup_source_register - Create wakeup source and add it to the list.
207 * @name: Name of the wakeup source to register.
209 struct wakeup_source *wakeup_source_register(const char *name)
211 struct wakeup_source *ws;
213 ws = wakeup_source_create(name);
215 wakeup_source_add(ws);
219 EXPORT_SYMBOL_GPL(wakeup_source_register);
222 * wakeup_source_unregister - Remove wakeup source from the list and remove it.
223 * @ws: Wakeup source object to unregister.
225 void wakeup_source_unregister(struct wakeup_source *ws)
228 wakeup_source_remove(ws);
229 wakeup_source_destroy(ws);
232 EXPORT_SYMBOL_GPL(wakeup_source_unregister);
235 * device_wakeup_attach - Attach a wakeup source object to a device object.
236 * @dev: Device to handle.
237 * @ws: Wakeup source object to attach to @dev.
239 * This causes @dev to be treated as a wakeup device.
241 static int device_wakeup_attach(struct device *dev, struct wakeup_source *ws)
243 spin_lock_irq(&dev->power.lock);
244 if (dev->power.wakeup) {
245 spin_unlock_irq(&dev->power.lock);
248 dev->power.wakeup = ws;
249 spin_unlock_irq(&dev->power.lock);
254 * device_wakeup_enable - Enable given device to be a wakeup source.
255 * @dev: Device to handle.
257 * Create a wakeup source object, register it and attach it to @dev.
259 int device_wakeup_enable(struct device *dev)
261 struct wakeup_source *ws;
264 if (!dev || !dev->power.can_wakeup)
267 ws = wakeup_source_register(dev_name(dev));
271 ret = device_wakeup_attach(dev, ws);
273 wakeup_source_unregister(ws);
277 EXPORT_SYMBOL_GPL(device_wakeup_enable);
280 * device_wakeup_attach_irq - Attach a wakeirq to a wakeup source
281 * @dev: Device to handle
282 * @wakeirq: Device specific wakeirq entry
284 * Attach a device wakeirq to the wakeup source so the device
285 * wake IRQ can be configured automatically for suspend and
288 * Call under the device's power.lock lock.
290 int device_wakeup_attach_irq(struct device *dev,
291 struct wake_irq *wakeirq)
293 struct wakeup_source *ws;
295 ws = dev->power.wakeup;
297 dev_err(dev, "forgot to call call device_init_wakeup?\n");
304 ws->wakeirq = wakeirq;
309 * device_wakeup_detach_irq - Detach a wakeirq from a wakeup source
310 * @dev: Device to handle
312 * Removes a device wakeirq from the wakeup source.
314 * Call under the device's power.lock lock.
316 void device_wakeup_detach_irq(struct device *dev)
318 struct wakeup_source *ws;
320 ws = dev->power.wakeup;
326 * device_wakeup_arm_wake_irqs(void)
328 * Itereates over the list of device wakeirqs to arm them.
330 void device_wakeup_arm_wake_irqs(void)
332 struct wakeup_source *ws;
335 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
337 dev_pm_arm_wake_irq(ws->wakeirq);
343 * device_wakeup_disarm_wake_irqs(void)
345 * Itereates over the list of device wakeirqs to disarm them.
347 void device_wakeup_disarm_wake_irqs(void)
349 struct wakeup_source *ws;
352 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
354 dev_pm_disarm_wake_irq(ws->wakeirq);
360 * device_wakeup_detach - Detach a device's wakeup source object from it.
361 * @dev: Device to detach the wakeup source object from.
363 * After it returns, @dev will not be treated as a wakeup device any more.
365 static struct wakeup_source *device_wakeup_detach(struct device *dev)
367 struct wakeup_source *ws;
369 spin_lock_irq(&dev->power.lock);
370 ws = dev->power.wakeup;
371 dev->power.wakeup = NULL;
372 spin_unlock_irq(&dev->power.lock);
377 * device_wakeup_disable - Do not regard a device as a wakeup source any more.
378 * @dev: Device to handle.
380 * Detach the @dev's wakeup source object from it, unregister this wakeup source
381 * object and destroy it.
383 int device_wakeup_disable(struct device *dev)
385 struct wakeup_source *ws;
387 if (!dev || !dev->power.can_wakeup)
390 ws = device_wakeup_detach(dev);
392 wakeup_source_unregister(ws);
396 EXPORT_SYMBOL_GPL(device_wakeup_disable);
399 * device_set_wakeup_capable - Set/reset device wakeup capability flag.
400 * @dev: Device to handle.
401 * @capable: Whether or not @dev is capable of waking up the system from sleep.
403 * If @capable is set, set the @dev's power.can_wakeup flag and add its
404 * wakeup-related attributes to sysfs. Otherwise, unset the @dev's
405 * power.can_wakeup flag and remove its wakeup-related attributes from sysfs.
407 * This function may sleep and it can't be called from any context where
408 * sleeping is not allowed.
410 void device_set_wakeup_capable(struct device *dev, bool capable)
412 if (!!dev->power.can_wakeup == !!capable)
415 if (device_is_registered(dev) && !list_empty(&dev->power.entry)) {
417 if (wakeup_sysfs_add(dev))
420 wakeup_sysfs_remove(dev);
423 dev->power.can_wakeup = capable;
425 EXPORT_SYMBOL_GPL(device_set_wakeup_capable);
428 * device_init_wakeup - Device wakeup initialization.
429 * @dev: Device to handle.
430 * @enable: Whether or not to enable @dev as a wakeup device.
432 * By default, most devices should leave wakeup disabled. The exceptions are
433 * devices that everyone expects to be wakeup sources: keyboards, power buttons,
434 * possibly network interfaces, etc. Also, devices that don't generate their
435 * own wakeup requests but merely forward requests from one bus to another
436 * (like PCI bridges) should have wakeup enabled by default.
438 int device_init_wakeup(struct device *dev, bool enable)
446 device_set_wakeup_capable(dev, true);
447 ret = device_wakeup_enable(dev);
449 if (dev->power.can_wakeup)
450 device_wakeup_disable(dev);
452 device_set_wakeup_capable(dev, false);
457 EXPORT_SYMBOL_GPL(device_init_wakeup);
460 * device_set_wakeup_enable - Enable or disable a device to wake up the system.
461 * @dev: Device to handle.
463 int device_set_wakeup_enable(struct device *dev, bool enable)
465 if (!dev || !dev->power.can_wakeup)
468 return enable ? device_wakeup_enable(dev) : device_wakeup_disable(dev);
470 EXPORT_SYMBOL_GPL(device_set_wakeup_enable);
473 * wakeup_source_not_registered - validate the given wakeup source.
474 * @ws: Wakeup source to be validated.
476 static bool wakeup_source_not_registered(struct wakeup_source *ws)
479 * Use timer struct to check if the given source is initialized
480 * by wakeup_source_add.
482 return ws->timer.function != pm_wakeup_timer_fn ||
483 ws->timer.data != (unsigned long)ws;
487 * The functions below use the observation that each wakeup event starts a
488 * period in which the system should not be suspended. The moment this period
489 * will end depends on how the wakeup event is going to be processed after being
490 * detected and all of the possible cases can be divided into two distinct
493 * First, a wakeup event may be detected by the same functional unit that will
494 * carry out the entire processing of it and possibly will pass it to user space
495 * for further processing. In that case the functional unit that has detected
496 * the event may later "close" the "no suspend" period associated with it
497 * directly as soon as it has been dealt with. The pair of pm_stay_awake() and
498 * pm_relax(), balanced with each other, is supposed to be used in such
501 * Second, a wakeup event may be detected by one functional unit and processed
502 * by another one. In that case the unit that has detected it cannot really
503 * "close" the "no suspend" period associated with it, unless it knows in
504 * advance what's going to happen to the event during processing. This
505 * knowledge, however, may not be available to it, so it can simply specify time
506 * to wait before the system can be suspended and pass it as the second
507 * argument of pm_wakeup_event().
509 * It is valid to call pm_relax() after pm_wakeup_event(), in which case the
510 * "no suspend" period will be ended either by the pm_relax(), or by the timer
511 * function executed when the timer expires, whichever comes first.
515 * wakup_source_activate - Mark given wakeup source as active.
516 * @ws: Wakeup source to handle.
518 * Update the @ws' statistics and, if @ws has just been activated, notify the PM
519 * core of the event by incrementing the counter of of wakeup events being
522 static void wakeup_source_activate(struct wakeup_source *ws)
526 if (WARN_ONCE(wakeup_source_not_registered(ws),
527 "unregistered wakeup source\n"))
531 * active wakeup source should bring the system
532 * out of PM_SUSPEND_FREEZE state
538 ws->last_time = ktime_get();
539 if (ws->autosleep_enabled)
540 ws->start_prevent_time = ws->last_time;
542 /* Increment the counter of events in progress. */
543 cec = atomic_inc_return(&combined_event_count);
545 trace_wakeup_source_activate(ws->name, cec);
549 * wakeup_source_report_event - Report wakeup event using the given source.
550 * @ws: Wakeup source to report the event for.
552 static void wakeup_source_report_event(struct wakeup_source *ws)
555 /* This is racy, but the counter is approximate anyway. */
556 if (events_check_enabled)
560 wakeup_source_activate(ws);
564 * __pm_stay_awake - Notify the PM core of a wakeup event.
565 * @ws: Wakeup source object associated with the source of the event.
567 * It is safe to call this function from interrupt context.
569 void __pm_stay_awake(struct wakeup_source *ws)
576 spin_lock_irqsave(&ws->lock, flags);
578 wakeup_source_report_event(ws);
579 del_timer(&ws->timer);
580 ws->timer_expires = 0;
582 spin_unlock_irqrestore(&ws->lock, flags);
584 EXPORT_SYMBOL_GPL(__pm_stay_awake);
587 * pm_stay_awake - Notify the PM core that a wakeup event is being processed.
588 * @dev: Device the wakeup event is related to.
590 * Notify the PM core of a wakeup event (signaled by @dev) by calling
591 * __pm_stay_awake for the @dev's wakeup source object.
593 * Call this function after detecting of a wakeup event if pm_relax() is going
594 * to be called directly after processing the event (and possibly passing it to
595 * user space for further processing).
597 void pm_stay_awake(struct device *dev)
604 spin_lock_irqsave(&dev->power.lock, flags);
605 __pm_stay_awake(dev->power.wakeup);
606 spin_unlock_irqrestore(&dev->power.lock, flags);
608 EXPORT_SYMBOL_GPL(pm_stay_awake);
610 #ifdef CONFIG_PM_AUTOSLEEP
611 static void update_prevent_sleep_time(struct wakeup_source *ws, ktime_t now)
613 ktime_t delta = ktime_sub(now, ws->start_prevent_time);
614 ws->prevent_sleep_time = ktime_add(ws->prevent_sleep_time, delta);
617 static inline void update_prevent_sleep_time(struct wakeup_source *ws,
622 * wakup_source_deactivate - Mark given wakeup source as inactive.
623 * @ws: Wakeup source to handle.
625 * Update the @ws' statistics and notify the PM core that the wakeup source has
626 * become inactive by decrementing the counter of wakeup events being processed
627 * and incrementing the counter of registered wakeup events.
629 static void wakeup_source_deactivate(struct wakeup_source *ws)
631 unsigned int cnt, inpr, cec;
637 * __pm_relax() may be called directly or from a timer function.
638 * If it is called directly right after the timer function has been
639 * started, but before the timer function calls __pm_relax(), it is
640 * possible that __pm_stay_awake() will be called in the meantime and
641 * will set ws->active. Then, ws->active may be cleared immediately
642 * by the __pm_relax() called from the timer function, but in such a
643 * case ws->relax_count will be different from ws->active_count.
645 if (ws->relax_count != ws->active_count) {
653 duration = ktime_sub(now, ws->last_time);
654 ws->total_time = ktime_add(ws->total_time, duration);
655 if (ktime_to_ns(duration) > ktime_to_ns(ws->max_time))
656 ws->max_time = duration;
659 del_timer(&ws->timer);
660 ws->timer_expires = 0;
662 if (ws->autosleep_enabled)
663 update_prevent_sleep_time(ws, now);
666 * Increment the counter of registered wakeup events and decrement the
667 * couter of wakeup events in progress simultaneously.
669 cec = atomic_add_return(MAX_IN_PROGRESS, &combined_event_count);
670 trace_wakeup_source_deactivate(ws->name, cec);
672 split_counters(&cnt, &inpr);
673 if (!inpr && waitqueue_active(&wakeup_count_wait_queue))
674 wake_up(&wakeup_count_wait_queue);
678 * __pm_relax - Notify the PM core that processing of a wakeup event has ended.
679 * @ws: Wakeup source object associated with the source of the event.
681 * Call this function for wakeup events whose processing started with calling
684 * It is safe to call it from interrupt context.
686 void __pm_relax(struct wakeup_source *ws)
693 spin_lock_irqsave(&ws->lock, flags);
695 wakeup_source_deactivate(ws);
696 spin_unlock_irqrestore(&ws->lock, flags);
698 EXPORT_SYMBOL_GPL(__pm_relax);
701 * pm_relax - Notify the PM core that processing of a wakeup event has ended.
702 * @dev: Device that signaled the event.
704 * Execute __pm_relax() for the @dev's wakeup source object.
706 void pm_relax(struct device *dev)
713 spin_lock_irqsave(&dev->power.lock, flags);
714 __pm_relax(dev->power.wakeup);
715 spin_unlock_irqrestore(&dev->power.lock, flags);
717 EXPORT_SYMBOL_GPL(pm_relax);
720 * pm_wakeup_timer_fn - Delayed finalization of a wakeup event.
721 * @data: Address of the wakeup source object associated with the event source.
723 * Call wakeup_source_deactivate() for the wakeup source whose address is stored
724 * in @data if it is currently active and its timer has not been canceled and
725 * the expiration time of the timer is not in future.
727 static void pm_wakeup_timer_fn(unsigned long data)
729 struct wakeup_source *ws = (struct wakeup_source *)data;
732 spin_lock_irqsave(&ws->lock, flags);
734 if (ws->active && ws->timer_expires
735 && time_after_eq(jiffies, ws->timer_expires)) {
736 wakeup_source_deactivate(ws);
740 spin_unlock_irqrestore(&ws->lock, flags);
744 * __pm_wakeup_event - Notify the PM core of a wakeup event.
745 * @ws: Wakeup source object associated with the event source.
746 * @msec: Anticipated event processing time (in milliseconds).
748 * Notify the PM core of a wakeup event whose source is @ws that will take
749 * approximately @msec milliseconds to be processed by the kernel. If @ws is
750 * not active, activate it. If @msec is nonzero, set up the @ws' timer to
751 * execute pm_wakeup_timer_fn() in future.
753 * It is safe to call this function from interrupt context.
755 void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec)
758 unsigned long expires;
763 spin_lock_irqsave(&ws->lock, flags);
765 wakeup_source_report_event(ws);
768 wakeup_source_deactivate(ws);
772 expires = jiffies + msecs_to_jiffies(msec);
776 if (!ws->timer_expires || time_after(expires, ws->timer_expires)) {
777 mod_timer(&ws->timer, expires);
778 ws->timer_expires = expires;
782 spin_unlock_irqrestore(&ws->lock, flags);
784 EXPORT_SYMBOL_GPL(__pm_wakeup_event);
788 * pm_wakeup_event - Notify the PM core of a wakeup event.
789 * @dev: Device the wakeup event is related to.
790 * @msec: Anticipated event processing time (in milliseconds).
792 * Call __pm_wakeup_event() for the @dev's wakeup source object.
794 void pm_wakeup_event(struct device *dev, unsigned int msec)
801 spin_lock_irqsave(&dev->power.lock, flags);
802 __pm_wakeup_event(dev->power.wakeup, msec);
803 spin_unlock_irqrestore(&dev->power.lock, flags);
805 EXPORT_SYMBOL_GPL(pm_wakeup_event);
807 void pm_print_active_wakeup_sources(void)
809 struct wakeup_source *ws;
811 struct wakeup_source *last_activity_ws = NULL;
814 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
816 pr_info("active wakeup source: %s\n", ws->name);
818 } else if (!active &&
819 (!last_activity_ws ||
820 ktime_to_ns(ws->last_time) >
821 ktime_to_ns(last_activity_ws->last_time))) {
822 last_activity_ws = ws;
826 if (!active && last_activity_ws)
827 pr_info("last active wakeup source: %s\n",
828 last_activity_ws->name);
831 EXPORT_SYMBOL_GPL(pm_print_active_wakeup_sources);
834 * pm_wakeup_pending - Check if power transition in progress should be aborted.
836 * Compare the current number of registered wakeup events with its preserved
837 * value from the past and return true if new wakeup events have been registered
838 * since the old value was stored. Also return true if the current number of
839 * wakeup events being processed is different from zero.
841 bool pm_wakeup_pending(void)
846 spin_lock_irqsave(&events_lock, flags);
847 if (events_check_enabled) {
848 unsigned int cnt, inpr;
850 split_counters(&cnt, &inpr);
851 ret = (cnt != saved_count || inpr > 0);
852 events_check_enabled = !ret;
854 spin_unlock_irqrestore(&events_lock, flags);
857 pr_info("PM: Wakeup pending, aborting suspend\n");
858 pm_print_active_wakeup_sources();
861 return ret || pm_abort_suspend;
864 void pm_system_wakeup(void)
866 pm_abort_suspend = true;
869 EXPORT_SYMBOL_GPL(pm_system_wakeup);
871 void pm_wakeup_clear(void)
873 pm_abort_suspend = false;
877 void pm_system_irq_wakeup(unsigned int irq_number)
879 if (pm_wakeup_irq == 0) {
880 pm_wakeup_irq = irq_number;
886 * pm_get_wakeup_count - Read the number of registered wakeup events.
887 * @count: Address to store the value at.
888 * @block: Whether or not to block.
890 * Store the number of registered wakeup events at the address in @count. If
891 * @block is set, block until the current number of wakeup events being
894 * Return 'false' if the current number of wakeup events being processed is
895 * nonzero. Otherwise return 'true'.
897 bool pm_get_wakeup_count(unsigned int *count, bool block)
899 unsigned int cnt, inpr;
905 prepare_to_wait(&wakeup_count_wait_queue, &wait,
907 split_counters(&cnt, &inpr);
908 if (inpr == 0 || signal_pending(current))
913 finish_wait(&wakeup_count_wait_queue, &wait);
916 split_counters(&cnt, &inpr);
922 * pm_save_wakeup_count - Save the current number of registered wakeup events.
923 * @count: Value to compare with the current number of registered wakeup events.
925 * If @count is equal to the current number of registered wakeup events and the
926 * current number of wakeup events being processed is zero, store @count as the
927 * old number of registered wakeup events for pm_check_wakeup_events(), enable
928 * wakeup events detection and return 'true'. Otherwise disable wakeup events
929 * detection and return 'false'.
931 bool pm_save_wakeup_count(unsigned int count)
933 unsigned int cnt, inpr;
936 events_check_enabled = false;
937 spin_lock_irqsave(&events_lock, flags);
938 split_counters(&cnt, &inpr);
939 if (cnt == count && inpr == 0) {
941 events_check_enabled = true;
943 spin_unlock_irqrestore(&events_lock, flags);
944 return events_check_enabled;
947 #ifdef CONFIG_PM_AUTOSLEEP
949 * pm_wakep_autosleep_enabled - Modify autosleep_enabled for all wakeup sources.
950 * @enabled: Whether to set or to clear the autosleep_enabled flags.
952 void pm_wakep_autosleep_enabled(bool set)
954 struct wakeup_source *ws;
955 ktime_t now = ktime_get();
958 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
959 spin_lock_irq(&ws->lock);
960 if (ws->autosleep_enabled != set) {
961 ws->autosleep_enabled = set;
964 ws->start_prevent_time = now;
966 update_prevent_sleep_time(ws, now);
969 spin_unlock_irq(&ws->lock);
973 #endif /* CONFIG_PM_AUTOSLEEP */
975 static struct dentry *wakeup_sources_stats_dentry;
978 * print_wakeup_source_stats - Print wakeup source statistics information.
979 * @m: seq_file to print the statistics into.
980 * @ws: Wakeup source object to print the statistics for.
982 static int print_wakeup_source_stats(struct seq_file *m,
983 struct wakeup_source *ws)
988 unsigned long active_count;
990 ktime_t prevent_sleep_time;
992 spin_lock_irqsave(&ws->lock, flags);
994 total_time = ws->total_time;
995 max_time = ws->max_time;
996 prevent_sleep_time = ws->prevent_sleep_time;
997 active_count = ws->active_count;
999 ktime_t now = ktime_get();
1001 active_time = ktime_sub(now, ws->last_time);
1002 total_time = ktime_add(total_time, active_time);
1003 if (active_time.tv64 > max_time.tv64)
1004 max_time = active_time;
1006 if (ws->autosleep_enabled)
1007 prevent_sleep_time = ktime_add(prevent_sleep_time,
1008 ktime_sub(now, ws->start_prevent_time));
1010 active_time = ktime_set(0, 0);
1013 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",
1014 ws->name, active_count, ws->event_count,
1015 ws->wakeup_count, ws->expire_count,
1016 ktime_to_ms(active_time), ktime_to_ms(total_time),
1017 ktime_to_ms(max_time), ktime_to_ms(ws->last_time),
1018 ktime_to_ms(prevent_sleep_time));
1020 spin_unlock_irqrestore(&ws->lock, flags);
1026 * wakeup_sources_stats_show - Print wakeup sources statistics information.
1027 * @m: seq_file to print the statistics into.
1029 static int wakeup_sources_stats_show(struct seq_file *m, void *unused)
1031 struct wakeup_source *ws;
1033 seq_puts(m, "name\t\tactive_count\tevent_count\twakeup_count\t"
1034 "expire_count\tactive_since\ttotal_time\tmax_time\t"
1035 "last_change\tprevent_suspend_time\n");
1038 list_for_each_entry_rcu(ws, &wakeup_sources, entry)
1039 print_wakeup_source_stats(m, ws);
1042 print_wakeup_source_stats(m, &deleted_ws);
1047 static int wakeup_sources_stats_open(struct inode *inode, struct file *file)
1049 return single_open(file, wakeup_sources_stats_show, NULL);
1052 static const struct file_operations wakeup_sources_stats_fops = {
1053 .owner = THIS_MODULE,
1054 .open = wakeup_sources_stats_open,
1056 .llseek = seq_lseek,
1057 .release = single_release,
1060 static int __init wakeup_sources_debugfs_init(void)
1062 wakeup_sources_stats_dentry = debugfs_create_file("wakeup_sources",
1063 S_IRUGO, NULL, NULL, &wakeup_sources_stats_fops);
1067 postcore_initcall(wakeup_sources_debugfs_init);