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/signal.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 greater than 0 and the system is suspending, terminate the suspend. */
32 static atomic_t 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 if (dev->power.wakeirq)
250 device_wakeup_attach_irq(dev, dev->power.wakeirq);
251 spin_unlock_irq(&dev->power.lock);
256 * device_wakeup_enable - Enable given device to be a wakeup source.
257 * @dev: Device to handle.
259 * Create a wakeup source object, register it and attach it to @dev.
261 int device_wakeup_enable(struct device *dev)
263 struct wakeup_source *ws;
266 if (!dev || !dev->power.can_wakeup)
269 ws = wakeup_source_register(dev_name(dev));
273 ret = device_wakeup_attach(dev, ws);
275 wakeup_source_unregister(ws);
279 EXPORT_SYMBOL_GPL(device_wakeup_enable);
282 * device_wakeup_attach_irq - Attach a wakeirq to a wakeup source
283 * @dev: Device to handle
284 * @wakeirq: Device specific wakeirq entry
286 * Attach a device wakeirq to the wakeup source so the device
287 * wake IRQ can be configured automatically for suspend and
290 * Call under the device's power.lock lock.
292 int device_wakeup_attach_irq(struct device *dev,
293 struct wake_irq *wakeirq)
295 struct wakeup_source *ws;
297 ws = dev->power.wakeup;
299 dev_err(dev, "forgot to call call device_init_wakeup?\n");
306 ws->wakeirq = wakeirq;
311 * device_wakeup_detach_irq - Detach a wakeirq from a wakeup source
312 * @dev: Device to handle
314 * Removes a device wakeirq from the wakeup source.
316 * Call under the device's power.lock lock.
318 void device_wakeup_detach_irq(struct device *dev)
320 struct wakeup_source *ws;
322 ws = dev->power.wakeup;
328 * device_wakeup_arm_wake_irqs(void)
330 * Itereates over the list of device wakeirqs to arm them.
332 void device_wakeup_arm_wake_irqs(void)
334 struct wakeup_source *ws;
337 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)
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);
391 wakeup_source_unregister(ws);
394 EXPORT_SYMBOL_GPL(device_wakeup_disable);
397 * device_set_wakeup_capable - Set/reset device wakeup capability flag.
398 * @dev: Device to handle.
399 * @capable: Whether or not @dev is capable of waking up the system from sleep.
401 * If @capable is set, set the @dev's power.can_wakeup flag and add its
402 * wakeup-related attributes to sysfs. Otherwise, unset the @dev's
403 * power.can_wakeup flag and remove its wakeup-related attributes from sysfs.
405 * This function may sleep and it can't be called from any context where
406 * sleeping is not allowed.
408 void device_set_wakeup_capable(struct device *dev, bool capable)
410 if (!!dev->power.can_wakeup == !!capable)
413 if (device_is_registered(dev) && !list_empty(&dev->power.entry)) {
415 if (wakeup_sysfs_add(dev))
418 wakeup_sysfs_remove(dev);
421 dev->power.can_wakeup = capable;
423 EXPORT_SYMBOL_GPL(device_set_wakeup_capable);
426 * device_init_wakeup - Device wakeup initialization.
427 * @dev: Device to handle.
428 * @enable: Whether or not to enable @dev as a wakeup device.
430 * By default, most devices should leave wakeup disabled. The exceptions are
431 * devices that everyone expects to be wakeup sources: keyboards, power buttons,
432 * possibly network interfaces, etc. Also, devices that don't generate their
433 * own wakeup requests but merely forward requests from one bus to another
434 * (like PCI bridges) should have wakeup enabled by default.
436 int device_init_wakeup(struct device *dev, bool enable)
444 device_set_wakeup_capable(dev, true);
445 ret = device_wakeup_enable(dev);
447 if (dev->power.can_wakeup)
448 device_wakeup_disable(dev);
450 device_set_wakeup_capable(dev, false);
455 EXPORT_SYMBOL_GPL(device_init_wakeup);
458 * device_set_wakeup_enable - Enable or disable a device to wake up the system.
459 * @dev: Device to handle.
461 int device_set_wakeup_enable(struct device *dev, bool enable)
463 if (!dev || !dev->power.can_wakeup)
466 return enable ? device_wakeup_enable(dev) : device_wakeup_disable(dev);
468 EXPORT_SYMBOL_GPL(device_set_wakeup_enable);
471 * wakeup_source_not_registered - validate the given wakeup source.
472 * @ws: Wakeup source to be validated.
474 static bool wakeup_source_not_registered(struct wakeup_source *ws)
477 * Use timer struct to check if the given source is initialized
478 * by wakeup_source_add.
480 return ws->timer.function != pm_wakeup_timer_fn ||
481 ws->timer.data != (unsigned long)ws;
485 * The functions below use the observation that each wakeup event starts a
486 * period in which the system should not be suspended. The moment this period
487 * will end depends on how the wakeup event is going to be processed after being
488 * detected and all of the possible cases can be divided into two distinct
491 * First, a wakeup event may be detected by the same functional unit that will
492 * carry out the entire processing of it and possibly will pass it to user space
493 * for further processing. In that case the functional unit that has detected
494 * the event may later "close" the "no suspend" period associated with it
495 * directly as soon as it has been dealt with. The pair of pm_stay_awake() and
496 * pm_relax(), balanced with each other, is supposed to be used in such
499 * Second, a wakeup event may be detected by one functional unit and processed
500 * by another one. In that case the unit that has detected it cannot really
501 * "close" the "no suspend" period associated with it, unless it knows in
502 * advance what's going to happen to the event during processing. This
503 * knowledge, however, may not be available to it, so it can simply specify time
504 * to wait before the system can be suspended and pass it as the second
505 * argument of pm_wakeup_event().
507 * It is valid to call pm_relax() after pm_wakeup_event(), in which case the
508 * "no suspend" period will be ended either by the pm_relax(), or by the timer
509 * function executed when the timer expires, whichever comes first.
513 * wakup_source_activate - Mark given wakeup source as active.
514 * @ws: Wakeup source to handle.
516 * Update the @ws' statistics and, if @ws has just been activated, notify the PM
517 * core of the event by incrementing the counter of of wakeup events being
520 static void wakeup_source_activate(struct wakeup_source *ws)
524 if (WARN_ONCE(wakeup_source_not_registered(ws),
525 "unregistered wakeup source\n"))
530 ws->last_time = ktime_get();
531 if (ws->autosleep_enabled)
532 ws->start_prevent_time = ws->last_time;
534 /* Increment the counter of events in progress. */
535 cec = atomic_inc_return(&combined_event_count);
537 trace_wakeup_source_activate(ws->name, cec);
541 * wakeup_source_report_event - Report wakeup event using the given source.
542 * @ws: Wakeup source to report the event for.
543 * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
545 static void wakeup_source_report_event(struct wakeup_source *ws, bool hard)
548 /* This is racy, but the counter is approximate anyway. */
549 if (events_check_enabled)
553 wakeup_source_activate(ws);
560 * __pm_stay_awake - Notify the PM core of a wakeup event.
561 * @ws: Wakeup source object associated with the source of the event.
563 * It is safe to call this function from interrupt context.
565 void __pm_stay_awake(struct wakeup_source *ws)
572 spin_lock_irqsave(&ws->lock, flags);
574 wakeup_source_report_event(ws, false);
575 del_timer(&ws->timer);
576 ws->timer_expires = 0;
578 spin_unlock_irqrestore(&ws->lock, flags);
580 EXPORT_SYMBOL_GPL(__pm_stay_awake);
583 * pm_stay_awake - Notify the PM core that a wakeup event is being processed.
584 * @dev: Device the wakeup event is related to.
586 * Notify the PM core of a wakeup event (signaled by @dev) by calling
587 * __pm_stay_awake for the @dev's wakeup source object.
589 * Call this function after detecting of a wakeup event if pm_relax() is going
590 * to be called directly after processing the event (and possibly passing it to
591 * user space for further processing).
593 void pm_stay_awake(struct device *dev)
600 spin_lock_irqsave(&dev->power.lock, flags);
601 __pm_stay_awake(dev->power.wakeup);
602 spin_unlock_irqrestore(&dev->power.lock, flags);
604 EXPORT_SYMBOL_GPL(pm_stay_awake);
606 #ifdef CONFIG_PM_AUTOSLEEP
607 static void update_prevent_sleep_time(struct wakeup_source *ws, ktime_t now)
609 ktime_t delta = ktime_sub(now, ws->start_prevent_time);
610 ws->prevent_sleep_time = ktime_add(ws->prevent_sleep_time, delta);
613 static inline void update_prevent_sleep_time(struct wakeup_source *ws,
618 * wakup_source_deactivate - Mark given wakeup source as inactive.
619 * @ws: Wakeup source to handle.
621 * Update the @ws' statistics and notify the PM core that the wakeup source has
622 * become inactive by decrementing the counter of wakeup events being processed
623 * and incrementing the counter of registered wakeup events.
625 static void wakeup_source_deactivate(struct wakeup_source *ws)
627 unsigned int cnt, inpr, cec;
633 * __pm_relax() may be called directly or from a timer function.
634 * If it is called directly right after the timer function has been
635 * started, but before the timer function calls __pm_relax(), it is
636 * possible that __pm_stay_awake() will be called in the meantime and
637 * will set ws->active. Then, ws->active may be cleared immediately
638 * by the __pm_relax() called from the timer function, but in such a
639 * case ws->relax_count will be different from ws->active_count.
641 if (ws->relax_count != ws->active_count) {
649 duration = ktime_sub(now, ws->last_time);
650 ws->total_time = ktime_add(ws->total_time, duration);
651 if (ktime_to_ns(duration) > ktime_to_ns(ws->max_time))
652 ws->max_time = duration;
655 del_timer(&ws->timer);
656 ws->timer_expires = 0;
658 if (ws->autosleep_enabled)
659 update_prevent_sleep_time(ws, now);
662 * Increment the counter of registered wakeup events and decrement the
663 * couter of wakeup events in progress simultaneously.
665 cec = atomic_add_return(MAX_IN_PROGRESS, &combined_event_count);
666 trace_wakeup_source_deactivate(ws->name, cec);
668 split_counters(&cnt, &inpr);
669 if (!inpr && waitqueue_active(&wakeup_count_wait_queue))
670 wake_up(&wakeup_count_wait_queue);
674 * __pm_relax - Notify the PM core that processing of a wakeup event has ended.
675 * @ws: Wakeup source object associated with the source of the event.
677 * Call this function for wakeup events whose processing started with calling
680 * It is safe to call it from interrupt context.
682 void __pm_relax(struct wakeup_source *ws)
689 spin_lock_irqsave(&ws->lock, flags);
691 wakeup_source_deactivate(ws);
692 spin_unlock_irqrestore(&ws->lock, flags);
694 EXPORT_SYMBOL_GPL(__pm_relax);
697 * pm_relax - Notify the PM core that processing of a wakeup event has ended.
698 * @dev: Device that signaled the event.
700 * Execute __pm_relax() for the @dev's wakeup source object.
702 void pm_relax(struct device *dev)
709 spin_lock_irqsave(&dev->power.lock, flags);
710 __pm_relax(dev->power.wakeup);
711 spin_unlock_irqrestore(&dev->power.lock, flags);
713 EXPORT_SYMBOL_GPL(pm_relax);
716 * pm_wakeup_timer_fn - Delayed finalization of a wakeup event.
717 * @data: Address of the wakeup source object associated with the event source.
719 * Call wakeup_source_deactivate() for the wakeup source whose address is stored
720 * in @data if it is currently active and its timer has not been canceled and
721 * the expiration time of the timer is not in future.
723 static void pm_wakeup_timer_fn(unsigned long data)
725 struct wakeup_source *ws = (struct wakeup_source *)data;
728 spin_lock_irqsave(&ws->lock, flags);
730 if (ws->active && ws->timer_expires
731 && time_after_eq(jiffies, ws->timer_expires)) {
732 wakeup_source_deactivate(ws);
736 spin_unlock_irqrestore(&ws->lock, flags);
740 * pm_wakeup_ws_event - Notify the PM core of a wakeup event.
741 * @ws: Wakeup source object associated with the event source.
742 * @msec: Anticipated event processing time (in milliseconds).
743 * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
745 * Notify the PM core of a wakeup event whose source is @ws that will take
746 * approximately @msec milliseconds to be processed by the kernel. If @ws is
747 * not active, activate it. If @msec is nonzero, set up the @ws' timer to
748 * execute pm_wakeup_timer_fn() in future.
750 * It is safe to call this function from interrupt context.
752 void pm_wakeup_ws_event(struct wakeup_source *ws, unsigned int msec, bool hard)
755 unsigned long expires;
760 spin_lock_irqsave(&ws->lock, flags);
762 wakeup_source_report_event(ws, hard);
765 wakeup_source_deactivate(ws);
769 expires = jiffies + msecs_to_jiffies(msec);
773 if (!ws->timer_expires || time_after(expires, ws->timer_expires)) {
774 mod_timer(&ws->timer, expires);
775 ws->timer_expires = expires;
779 spin_unlock_irqrestore(&ws->lock, flags);
781 EXPORT_SYMBOL_GPL(pm_wakeup_ws_event);
784 * pm_wakeup_event - Notify the PM core of a wakeup event.
785 * @dev: Device the wakeup event is related to.
786 * @msec: Anticipated event processing time (in milliseconds).
787 * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
789 * Call pm_wakeup_ws_event() for the @dev's wakeup source object.
791 void pm_wakeup_dev_event(struct device *dev, unsigned int msec, bool hard)
798 spin_lock_irqsave(&dev->power.lock, flags);
799 pm_wakeup_ws_event(dev->power.wakeup, msec, hard);
800 spin_unlock_irqrestore(&dev->power.lock, flags);
802 EXPORT_SYMBOL_GPL(pm_wakeup_dev_event);
804 void pm_print_active_wakeup_sources(void)
806 struct wakeup_source *ws;
808 struct wakeup_source *last_activity_ws = NULL;
811 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
813 pr_debug("active wakeup source: %s\n", ws->name);
815 } else if (!active &&
816 (!last_activity_ws ||
817 ktime_to_ns(ws->last_time) >
818 ktime_to_ns(last_activity_ws->last_time))) {
819 last_activity_ws = ws;
823 if (!active && last_activity_ws)
824 pr_debug("last active wakeup source: %s\n",
825 last_activity_ws->name);
828 EXPORT_SYMBOL_GPL(pm_print_active_wakeup_sources);
831 * pm_wakeup_pending - Check if power transition in progress should be aborted.
833 * Compare the current number of registered wakeup events with its preserved
834 * value from the past and return true if new wakeup events have been registered
835 * since the old value was stored. Also return true if the current number of
836 * wakeup events being processed is different from zero.
838 bool pm_wakeup_pending(void)
843 spin_lock_irqsave(&events_lock, flags);
844 if (events_check_enabled) {
845 unsigned int cnt, inpr;
847 split_counters(&cnt, &inpr);
848 ret = (cnt != saved_count || inpr > 0);
849 events_check_enabled = !ret;
851 spin_unlock_irqrestore(&events_lock, flags);
854 pr_info("PM: Wakeup pending, aborting suspend\n");
855 pm_print_active_wakeup_sources();
858 return ret || atomic_read(&pm_abort_suspend) > 0;
861 void pm_system_wakeup(void)
863 atomic_inc(&pm_abort_suspend);
866 EXPORT_SYMBOL_GPL(pm_system_wakeup);
868 void pm_system_cancel_wakeup(void)
870 atomic_dec(&pm_abort_suspend);
873 void pm_wakeup_clear(bool reset)
877 atomic_set(&pm_abort_suspend, 0);
880 void pm_system_irq_wakeup(unsigned int irq_number)
882 if (pm_wakeup_irq == 0) {
883 pm_wakeup_irq = irq_number;
889 * pm_get_wakeup_count - Read the number of registered wakeup events.
890 * @count: Address to store the value at.
891 * @block: Whether or not to block.
893 * Store the number of registered wakeup events at the address in @count. If
894 * @block is set, block until the current number of wakeup events being
897 * Return 'false' if the current number of wakeup events being processed is
898 * nonzero. Otherwise return 'true'.
900 bool pm_get_wakeup_count(unsigned int *count, bool block)
902 unsigned int cnt, inpr;
908 prepare_to_wait(&wakeup_count_wait_queue, &wait,
910 split_counters(&cnt, &inpr);
911 if (inpr == 0 || signal_pending(current))
913 pm_print_active_wakeup_sources();
916 finish_wait(&wakeup_count_wait_queue, &wait);
919 split_counters(&cnt, &inpr);
925 * pm_save_wakeup_count - Save the current number of registered wakeup events.
926 * @count: Value to compare with the current number of registered wakeup events.
928 * If @count is equal to the current number of registered wakeup events and the
929 * current number of wakeup events being processed is zero, store @count as the
930 * old number of registered wakeup events for pm_check_wakeup_events(), enable
931 * wakeup events detection and return 'true'. Otherwise disable wakeup events
932 * detection and return 'false'.
934 bool pm_save_wakeup_count(unsigned int count)
936 unsigned int cnt, inpr;
939 events_check_enabled = false;
940 spin_lock_irqsave(&events_lock, flags);
941 split_counters(&cnt, &inpr);
942 if (cnt == count && inpr == 0) {
944 events_check_enabled = true;
946 spin_unlock_irqrestore(&events_lock, flags);
947 return events_check_enabled;
950 #ifdef CONFIG_PM_AUTOSLEEP
952 * pm_wakep_autosleep_enabled - Modify autosleep_enabled for all wakeup sources.
953 * @enabled: Whether to set or to clear the autosleep_enabled flags.
955 void pm_wakep_autosleep_enabled(bool set)
957 struct wakeup_source *ws;
958 ktime_t now = ktime_get();
961 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
962 spin_lock_irq(&ws->lock);
963 if (ws->autosleep_enabled != set) {
964 ws->autosleep_enabled = set;
967 ws->start_prevent_time = now;
969 update_prevent_sleep_time(ws, now);
972 spin_unlock_irq(&ws->lock);
976 #endif /* CONFIG_PM_AUTOSLEEP */
978 static struct dentry *wakeup_sources_stats_dentry;
981 * print_wakeup_source_stats - Print wakeup source statistics information.
982 * @m: seq_file to print the statistics into.
983 * @ws: Wakeup source object to print the statistics for.
985 static int print_wakeup_source_stats(struct seq_file *m,
986 struct wakeup_source *ws)
991 unsigned long active_count;
993 ktime_t prevent_sleep_time;
995 spin_lock_irqsave(&ws->lock, flags);
997 total_time = ws->total_time;
998 max_time = ws->max_time;
999 prevent_sleep_time = ws->prevent_sleep_time;
1000 active_count = ws->active_count;
1002 ktime_t now = ktime_get();
1004 active_time = ktime_sub(now, ws->last_time);
1005 total_time = ktime_add(total_time, active_time);
1006 if (active_time > max_time)
1007 max_time = active_time;
1009 if (ws->autosleep_enabled)
1010 prevent_sleep_time = ktime_add(prevent_sleep_time,
1011 ktime_sub(now, ws->start_prevent_time));
1016 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",
1017 ws->name, active_count, ws->event_count,
1018 ws->wakeup_count, ws->expire_count,
1019 ktime_to_ms(active_time), ktime_to_ms(total_time),
1020 ktime_to_ms(max_time), ktime_to_ms(ws->last_time),
1021 ktime_to_ms(prevent_sleep_time));
1023 spin_unlock_irqrestore(&ws->lock, flags);
1029 * wakeup_sources_stats_show - Print wakeup sources statistics information.
1030 * @m: seq_file to print the statistics into.
1032 static int wakeup_sources_stats_show(struct seq_file *m, void *unused)
1034 struct wakeup_source *ws;
1036 seq_puts(m, "name\t\tactive_count\tevent_count\twakeup_count\t"
1037 "expire_count\tactive_since\ttotal_time\tmax_time\t"
1038 "last_change\tprevent_suspend_time\n");
1041 list_for_each_entry_rcu(ws, &wakeup_sources, entry)
1042 print_wakeup_source_stats(m, ws);
1045 print_wakeup_source_stats(m, &deleted_ws);
1050 static int wakeup_sources_stats_open(struct inode *inode, struct file *file)
1052 return single_open(file, wakeup_sources_stats_show, NULL);
1055 static const struct file_operations wakeup_sources_stats_fops = {
1056 .owner = THIS_MODULE,
1057 .open = wakeup_sources_stats_open,
1059 .llseek = seq_lseek,
1060 .release = single_release,
1063 static int __init wakeup_sources_debugfs_init(void)
1065 wakeup_sources_stats_dentry = debugfs_create_file("wakeup_sources",
1066 S_IRUGO, NULL, NULL, &wakeup_sources_stats_fops);
1070 postcore_initcall(wakeup_sources_debugfs_init);