1 // SPDX-License-Identifier: GPL-2.0
3 * drivers/base/power/wakeup.c - System wakeup events framework
5 * Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
7 #define pr_fmt(fmt) "PM: " fmt
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>
22 #ifndef CONFIG_SUSPEND
23 suspend_state_t pm_suspend_target_state;
24 #define pm_suspend_target_state (PM_SUSPEND_ON)
28 * If set, the suspend/hibernate code will abort transitions to a sleep state
29 * if wakeup events are registered during or immediately before the transition.
31 bool events_check_enabled __read_mostly;
33 /* First wakeup IRQ seen by the kernel in the last cycle. */
34 unsigned int pm_wakeup_irq __read_mostly;
36 /* If greater than 0 and the system is suspending, terminate the suspend. */
37 static atomic_t pm_abort_suspend __read_mostly;
40 * Combined counters of registered wakeup events and wakeup events in progress.
41 * They need to be modified together atomically, so it's better to use one
42 * atomic variable to hold them both.
44 static atomic_t combined_event_count = ATOMIC_INIT(0);
46 #define IN_PROGRESS_BITS (sizeof(int) * 4)
47 #define MAX_IN_PROGRESS ((1 << IN_PROGRESS_BITS) - 1)
49 static void split_counters(unsigned int *cnt, unsigned int *inpr)
51 unsigned int comb = atomic_read(&combined_event_count);
53 *cnt = (comb >> IN_PROGRESS_BITS);
54 *inpr = comb & MAX_IN_PROGRESS;
57 /* A preserved old value of the events counter. */
58 static unsigned int saved_count;
60 static DEFINE_RAW_SPINLOCK(events_lock);
62 static void pm_wakeup_timer_fn(struct timer_list *t);
64 static LIST_HEAD(wakeup_sources);
66 static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue);
68 DEFINE_STATIC_SRCU(wakeup_srcu);
70 static struct wakeup_source deleted_ws = {
72 .lock = __SPIN_LOCK_UNLOCKED(deleted_ws.lock),
75 static DEFINE_IDA(wakeup_ida);
78 * wakeup_source_create - Create a struct wakeup_source object.
79 * @name: Name of the new wakeup source.
81 struct wakeup_source *wakeup_source_create(const char *name)
83 struct wakeup_source *ws;
87 ws = kzalloc(sizeof(*ws), GFP_KERNEL);
91 ws_name = kstrdup_const(name, GFP_KERNEL);
96 id = ida_alloc(&wakeup_ida, GFP_KERNEL);
104 kfree_const(ws->name);
110 EXPORT_SYMBOL_GPL(wakeup_source_create);
113 * Record wakeup_source statistics being deleted into a dummy wakeup_source.
115 static void wakeup_source_record(struct wakeup_source *ws)
119 spin_lock_irqsave(&deleted_ws.lock, flags);
121 if (ws->event_count) {
122 deleted_ws.total_time =
123 ktime_add(deleted_ws.total_time, ws->total_time);
124 deleted_ws.prevent_sleep_time =
125 ktime_add(deleted_ws.prevent_sleep_time,
126 ws->prevent_sleep_time);
127 deleted_ws.max_time =
128 ktime_compare(deleted_ws.max_time, ws->max_time) > 0 ?
129 deleted_ws.max_time : ws->max_time;
130 deleted_ws.event_count += ws->event_count;
131 deleted_ws.active_count += ws->active_count;
132 deleted_ws.relax_count += ws->relax_count;
133 deleted_ws.expire_count += ws->expire_count;
134 deleted_ws.wakeup_count += ws->wakeup_count;
137 spin_unlock_irqrestore(&deleted_ws.lock, flags);
140 static void wakeup_source_free(struct wakeup_source *ws)
142 ida_free(&wakeup_ida, ws->id);
143 kfree_const(ws->name);
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)
159 wakeup_source_record(ws);
160 wakeup_source_free(ws);
162 EXPORT_SYMBOL_GPL(wakeup_source_destroy);
165 * wakeup_source_add - Add given object to the list of wakeup sources.
166 * @ws: Wakeup source object to add to the list.
168 void wakeup_source_add(struct wakeup_source *ws)
175 spin_lock_init(&ws->lock);
176 timer_setup(&ws->timer, pm_wakeup_timer_fn, 0);
179 raw_spin_lock_irqsave(&events_lock, flags);
180 list_add_rcu(&ws->entry, &wakeup_sources);
181 raw_spin_unlock_irqrestore(&events_lock, flags);
183 EXPORT_SYMBOL_GPL(wakeup_source_add);
186 * wakeup_source_remove - Remove given object from the wakeup sources list.
187 * @ws: Wakeup source object to remove from the list.
189 void wakeup_source_remove(struct wakeup_source *ws)
196 raw_spin_lock_irqsave(&events_lock, flags);
197 list_del_rcu(&ws->entry);
198 raw_spin_unlock_irqrestore(&events_lock, flags);
199 synchronize_srcu(&wakeup_srcu);
201 del_timer_sync(&ws->timer);
203 * Clear timer.function to make wakeup_source_not_registered() treat
204 * this wakeup source as not registered.
206 ws->timer.function = NULL;
208 EXPORT_SYMBOL_GPL(wakeup_source_remove);
211 * wakeup_source_register - Create wakeup source and add it to the list.
212 * @dev: Device this wakeup source is associated with (or NULL if virtual).
213 * @name: Name of the wakeup source to register.
215 struct wakeup_source *wakeup_source_register(struct device *dev,
218 struct wakeup_source *ws;
221 ws = wakeup_source_create(name);
223 if (!dev || device_is_registered(dev)) {
224 ret = wakeup_source_sysfs_add(dev, ws);
226 wakeup_source_free(ws);
230 wakeup_source_add(ws);
234 EXPORT_SYMBOL_GPL(wakeup_source_register);
237 * wakeup_source_unregister - Remove wakeup source from the list and remove it.
238 * @ws: Wakeup source object to unregister.
240 void wakeup_source_unregister(struct wakeup_source *ws)
243 wakeup_source_remove(ws);
244 wakeup_source_sysfs_remove(ws);
245 wakeup_source_destroy(ws);
248 EXPORT_SYMBOL_GPL(wakeup_source_unregister);
251 * device_wakeup_attach - Attach a wakeup source object to a device object.
252 * @dev: Device to handle.
253 * @ws: Wakeup source object to attach to @dev.
255 * This causes @dev to be treated as a wakeup device.
257 static int device_wakeup_attach(struct device *dev, struct wakeup_source *ws)
259 spin_lock_irq(&dev->power.lock);
260 if (dev->power.wakeup) {
261 spin_unlock_irq(&dev->power.lock);
264 dev->power.wakeup = ws;
265 if (dev->power.wakeirq)
266 device_wakeup_attach_irq(dev, dev->power.wakeirq);
267 spin_unlock_irq(&dev->power.lock);
272 * device_wakeup_enable - Enable given device to be a wakeup source.
273 * @dev: Device to handle.
275 * Create a wakeup source object, register it and attach it to @dev.
277 int device_wakeup_enable(struct device *dev)
279 struct wakeup_source *ws;
282 if (!dev || !dev->power.can_wakeup)
285 if (pm_suspend_target_state != PM_SUSPEND_ON)
286 dev_dbg(dev, "Suspicious %s() during system transition!\n", __func__);
288 ws = wakeup_source_register(dev, dev_name(dev));
292 ret = device_wakeup_attach(dev, ws);
294 wakeup_source_unregister(ws);
298 EXPORT_SYMBOL_GPL(device_wakeup_enable);
301 * device_wakeup_attach_irq - Attach a wakeirq to a wakeup source
302 * @dev: Device to handle
303 * @wakeirq: Device specific wakeirq entry
305 * Attach a device wakeirq to the wakeup source so the device
306 * wake IRQ can be configured automatically for suspend and
309 * Call under the device's power.lock lock.
311 void device_wakeup_attach_irq(struct device *dev,
312 struct wake_irq *wakeirq)
314 struct wakeup_source *ws;
316 ws = dev->power.wakeup;
321 dev_err(dev, "Leftover wakeup IRQ found, overriding\n");
323 ws->wakeirq = wakeirq;
327 * device_wakeup_detach_irq - Detach a wakeirq from a wakeup source
328 * @dev: Device to handle
330 * Removes a device wakeirq from the wakeup source.
332 * Call under the device's power.lock lock.
334 void device_wakeup_detach_irq(struct device *dev)
336 struct wakeup_source *ws;
338 ws = dev->power.wakeup;
344 * device_wakeup_arm_wake_irqs(void)
346 * Itereates over the list of device wakeirqs to arm them.
348 void device_wakeup_arm_wake_irqs(void)
350 struct wakeup_source *ws;
353 srcuidx = srcu_read_lock(&wakeup_srcu);
354 list_for_each_entry_rcu(ws, &wakeup_sources, entry)
355 dev_pm_arm_wake_irq(ws->wakeirq);
356 srcu_read_unlock(&wakeup_srcu, srcuidx);
360 * device_wakeup_disarm_wake_irqs(void)
362 * Itereates over the list of device wakeirqs to disarm them.
364 void device_wakeup_disarm_wake_irqs(void)
366 struct wakeup_source *ws;
369 srcuidx = srcu_read_lock(&wakeup_srcu);
370 list_for_each_entry_rcu(ws, &wakeup_sources, entry)
371 dev_pm_disarm_wake_irq(ws->wakeirq);
372 srcu_read_unlock(&wakeup_srcu, srcuidx);
376 * device_wakeup_detach - Detach a device's wakeup source object from it.
377 * @dev: Device to detach the wakeup source object from.
379 * After it returns, @dev will not be treated as a wakeup device any more.
381 static struct wakeup_source *device_wakeup_detach(struct device *dev)
383 struct wakeup_source *ws;
385 spin_lock_irq(&dev->power.lock);
386 ws = dev->power.wakeup;
387 dev->power.wakeup = NULL;
388 spin_unlock_irq(&dev->power.lock);
393 * device_wakeup_disable - Do not regard a device as a wakeup source any more.
394 * @dev: Device to handle.
396 * Detach the @dev's wakeup source object from it, unregister this wakeup source
397 * object and destroy it.
399 int device_wakeup_disable(struct device *dev)
401 struct wakeup_source *ws;
403 if (!dev || !dev->power.can_wakeup)
406 ws = device_wakeup_detach(dev);
407 wakeup_source_unregister(ws);
410 EXPORT_SYMBOL_GPL(device_wakeup_disable);
413 * device_set_wakeup_capable - Set/reset device wakeup capability flag.
414 * @dev: Device to handle.
415 * @capable: Whether or not @dev is capable of waking up the system from sleep.
417 * If @capable is set, set the @dev's power.can_wakeup flag and add its
418 * wakeup-related attributes to sysfs. Otherwise, unset the @dev's
419 * power.can_wakeup flag and remove its wakeup-related attributes from sysfs.
421 * This function may sleep and it can't be called from any context where
422 * sleeping is not allowed.
424 void device_set_wakeup_capable(struct device *dev, bool capable)
426 if (!!dev->power.can_wakeup == !!capable)
429 dev->power.can_wakeup = capable;
430 if (device_is_registered(dev) && !list_empty(&dev->power.entry)) {
432 int ret = wakeup_sysfs_add(dev);
435 dev_info(dev, "Wakeup sysfs attributes not added\n");
437 wakeup_sysfs_remove(dev);
441 EXPORT_SYMBOL_GPL(device_set_wakeup_capable);
444 * device_init_wakeup - Device wakeup initialization.
445 * @dev: Device to handle.
446 * @enable: Whether or not to enable @dev as a wakeup device.
448 * By default, most devices should leave wakeup disabled. The exceptions are
449 * devices that everyone expects to be wakeup sources: keyboards, power buttons,
450 * possibly network interfaces, etc. Also, devices that don't generate their
451 * own wakeup requests but merely forward requests from one bus to another
452 * (like PCI bridges) should have wakeup enabled by default.
454 int device_init_wakeup(struct device *dev, bool enable)
462 device_set_wakeup_capable(dev, true);
463 ret = device_wakeup_enable(dev);
465 device_wakeup_disable(dev);
466 device_set_wakeup_capable(dev, false);
471 EXPORT_SYMBOL_GPL(device_init_wakeup);
474 * device_set_wakeup_enable - Enable or disable a device to wake up the system.
475 * @dev: Device to handle.
477 int device_set_wakeup_enable(struct device *dev, bool enable)
479 return enable ? device_wakeup_enable(dev) : device_wakeup_disable(dev);
481 EXPORT_SYMBOL_GPL(device_set_wakeup_enable);
484 * wakeup_source_not_registered - validate the given wakeup source.
485 * @ws: Wakeup source to be validated.
487 static bool wakeup_source_not_registered(struct wakeup_source *ws)
490 * Use timer struct to check if the given source is initialized
491 * by wakeup_source_add.
493 return ws->timer.function != pm_wakeup_timer_fn;
497 * The functions below use the observation that each wakeup event starts a
498 * period in which the system should not be suspended. The moment this period
499 * will end depends on how the wakeup event is going to be processed after being
500 * detected and all of the possible cases can be divided into two distinct
503 * First, a wakeup event may be detected by the same functional unit that will
504 * carry out the entire processing of it and possibly will pass it to user space
505 * for further processing. In that case the functional unit that has detected
506 * the event may later "close" the "no suspend" period associated with it
507 * directly as soon as it has been dealt with. The pair of pm_stay_awake() and
508 * pm_relax(), balanced with each other, is supposed to be used in such
511 * Second, a wakeup event may be detected by one functional unit and processed
512 * by another one. In that case the unit that has detected it cannot really
513 * "close" the "no suspend" period associated with it, unless it knows in
514 * advance what's going to happen to the event during processing. This
515 * knowledge, however, may not be available to it, so it can simply specify time
516 * to wait before the system can be suspended and pass it as the second
517 * argument of pm_wakeup_event().
519 * It is valid to call pm_relax() after pm_wakeup_event(), in which case the
520 * "no suspend" period will be ended either by the pm_relax(), or by the timer
521 * function executed when the timer expires, whichever comes first.
525 * wakup_source_activate - Mark given wakeup source as active.
526 * @ws: Wakeup source to handle.
528 * Update the @ws' statistics and, if @ws has just been activated, notify the PM
529 * core of the event by incrementing the counter of of wakeup events being
532 static void wakeup_source_activate(struct wakeup_source *ws)
536 if (WARN_ONCE(wakeup_source_not_registered(ws),
537 "unregistered wakeup source\n"))
542 ws->last_time = ktime_get();
543 if (ws->autosleep_enabled)
544 ws->start_prevent_time = ws->last_time;
546 /* Increment the counter of events in progress. */
547 cec = atomic_inc_return(&combined_event_count);
549 trace_wakeup_source_activate(ws->name, cec);
553 * wakeup_source_report_event - Report wakeup event using the given source.
554 * @ws: Wakeup source to report the event for.
555 * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
557 static void wakeup_source_report_event(struct wakeup_source *ws, bool hard)
560 /* This is racy, but the counter is approximate anyway. */
561 if (events_check_enabled)
565 wakeup_source_activate(ws);
572 * __pm_stay_awake - Notify the PM core of a wakeup event.
573 * @ws: Wakeup source object associated with the source of the event.
575 * It is safe to call this function from interrupt context.
577 void __pm_stay_awake(struct wakeup_source *ws)
584 spin_lock_irqsave(&ws->lock, flags);
586 wakeup_source_report_event(ws, false);
587 del_timer(&ws->timer);
588 ws->timer_expires = 0;
590 spin_unlock_irqrestore(&ws->lock, flags);
592 EXPORT_SYMBOL_GPL(__pm_stay_awake);
595 * pm_stay_awake - Notify the PM core that a wakeup event is being processed.
596 * @dev: Device the wakeup event is related to.
598 * Notify the PM core of a wakeup event (signaled by @dev) by calling
599 * __pm_stay_awake for the @dev's wakeup source object.
601 * Call this function after detecting of a wakeup event if pm_relax() is going
602 * to be called directly after processing the event (and possibly passing it to
603 * user space for further processing).
605 void pm_stay_awake(struct device *dev)
612 spin_lock_irqsave(&dev->power.lock, flags);
613 __pm_stay_awake(dev->power.wakeup);
614 spin_unlock_irqrestore(&dev->power.lock, flags);
616 EXPORT_SYMBOL_GPL(pm_stay_awake);
618 #ifdef CONFIG_PM_AUTOSLEEP
619 static void update_prevent_sleep_time(struct wakeup_source *ws, ktime_t now)
621 ktime_t delta = ktime_sub(now, ws->start_prevent_time);
622 ws->prevent_sleep_time = ktime_add(ws->prevent_sleep_time, delta);
625 static inline void update_prevent_sleep_time(struct wakeup_source *ws,
630 * wakup_source_deactivate - Mark given wakeup source as inactive.
631 * @ws: Wakeup source to handle.
633 * Update the @ws' statistics and notify the PM core that the wakeup source has
634 * become inactive by decrementing the counter of wakeup events being processed
635 * and incrementing the counter of registered wakeup events.
637 static void wakeup_source_deactivate(struct wakeup_source *ws)
639 unsigned int cnt, inpr, cec;
645 * __pm_relax() may be called directly or from a timer function.
646 * If it is called directly right after the timer function has been
647 * started, but before the timer function calls __pm_relax(), it is
648 * possible that __pm_stay_awake() will be called in the meantime and
649 * will set ws->active. Then, ws->active may be cleared immediately
650 * by the __pm_relax() called from the timer function, but in such a
651 * case ws->relax_count will be different from ws->active_count.
653 if (ws->relax_count != ws->active_count) {
661 duration = ktime_sub(now, ws->last_time);
662 ws->total_time = ktime_add(ws->total_time, duration);
663 if (ktime_to_ns(duration) > ktime_to_ns(ws->max_time))
664 ws->max_time = duration;
667 del_timer(&ws->timer);
668 ws->timer_expires = 0;
670 if (ws->autosleep_enabled)
671 update_prevent_sleep_time(ws, now);
674 * Increment the counter of registered wakeup events and decrement the
675 * couter of wakeup events in progress simultaneously.
677 cec = atomic_add_return(MAX_IN_PROGRESS, &combined_event_count);
678 trace_wakeup_source_deactivate(ws->name, cec);
680 split_counters(&cnt, &inpr);
681 if (!inpr && waitqueue_active(&wakeup_count_wait_queue))
682 wake_up(&wakeup_count_wait_queue);
686 * __pm_relax - Notify the PM core that processing of a wakeup event has ended.
687 * @ws: Wakeup source object associated with the source of the event.
689 * Call this function for wakeup events whose processing started with calling
692 * It is safe to call it from interrupt context.
694 void __pm_relax(struct wakeup_source *ws)
701 spin_lock_irqsave(&ws->lock, flags);
703 wakeup_source_deactivate(ws);
704 spin_unlock_irqrestore(&ws->lock, flags);
706 EXPORT_SYMBOL_GPL(__pm_relax);
709 * pm_relax - Notify the PM core that processing of a wakeup event has ended.
710 * @dev: Device that signaled the event.
712 * Execute __pm_relax() for the @dev's wakeup source object.
714 void pm_relax(struct device *dev)
721 spin_lock_irqsave(&dev->power.lock, flags);
722 __pm_relax(dev->power.wakeup);
723 spin_unlock_irqrestore(&dev->power.lock, flags);
725 EXPORT_SYMBOL_GPL(pm_relax);
728 * pm_wakeup_timer_fn - Delayed finalization of a wakeup event.
729 * @data: Address of the wakeup source object associated with the event source.
731 * Call wakeup_source_deactivate() for the wakeup source whose address is stored
732 * in @data if it is currently active and its timer has not been canceled and
733 * the expiration time of the timer is not in future.
735 static void pm_wakeup_timer_fn(struct timer_list *t)
737 struct wakeup_source *ws = from_timer(ws, t, timer);
740 spin_lock_irqsave(&ws->lock, flags);
742 if (ws->active && ws->timer_expires
743 && time_after_eq(jiffies, ws->timer_expires)) {
744 wakeup_source_deactivate(ws);
748 spin_unlock_irqrestore(&ws->lock, flags);
752 * pm_wakeup_ws_event - Notify the PM core of a wakeup event.
753 * @ws: Wakeup source object associated with the event source.
754 * @msec: Anticipated event processing time (in milliseconds).
755 * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
757 * Notify the PM core of a wakeup event whose source is @ws that will take
758 * approximately @msec milliseconds to be processed by the kernel. If @ws is
759 * not active, activate it. If @msec is nonzero, set up the @ws' timer to
760 * execute pm_wakeup_timer_fn() in future.
762 * It is safe to call this function from interrupt context.
764 void pm_wakeup_ws_event(struct wakeup_source *ws, unsigned int msec, bool hard)
767 unsigned long expires;
772 spin_lock_irqsave(&ws->lock, flags);
774 wakeup_source_report_event(ws, hard);
777 wakeup_source_deactivate(ws);
781 expires = jiffies + msecs_to_jiffies(msec);
785 if (!ws->timer_expires || time_after(expires, ws->timer_expires)) {
786 mod_timer(&ws->timer, expires);
787 ws->timer_expires = expires;
791 spin_unlock_irqrestore(&ws->lock, flags);
793 EXPORT_SYMBOL_GPL(pm_wakeup_ws_event);
796 * pm_wakeup_dev_event - Notify the PM core of a wakeup event.
797 * @dev: Device the wakeup event is related to.
798 * @msec: Anticipated event processing time (in milliseconds).
799 * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
801 * Call pm_wakeup_ws_event() for the @dev's wakeup source object.
803 void pm_wakeup_dev_event(struct device *dev, unsigned int msec, bool hard)
810 spin_lock_irqsave(&dev->power.lock, flags);
811 pm_wakeup_ws_event(dev->power.wakeup, msec, hard);
812 spin_unlock_irqrestore(&dev->power.lock, flags);
814 EXPORT_SYMBOL_GPL(pm_wakeup_dev_event);
816 void pm_print_active_wakeup_sources(void)
818 struct wakeup_source *ws;
819 int srcuidx, active = 0;
820 struct wakeup_source *last_activity_ws = NULL;
822 srcuidx = srcu_read_lock(&wakeup_srcu);
823 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
825 pm_pr_dbg("active wakeup source: %s\n", ws->name);
827 } else if (!active &&
828 (!last_activity_ws ||
829 ktime_to_ns(ws->last_time) >
830 ktime_to_ns(last_activity_ws->last_time))) {
831 last_activity_ws = ws;
835 if (!active && last_activity_ws)
836 pm_pr_dbg("last active wakeup source: %s\n",
837 last_activity_ws->name);
838 srcu_read_unlock(&wakeup_srcu, srcuidx);
840 EXPORT_SYMBOL_GPL(pm_print_active_wakeup_sources);
843 * pm_wakeup_pending - Check if power transition in progress should be aborted.
845 * Compare the current number of registered wakeup events with its preserved
846 * value from the past and return true if new wakeup events have been registered
847 * since the old value was stored. Also return true if the current number of
848 * wakeup events being processed is different from zero.
850 bool pm_wakeup_pending(void)
855 raw_spin_lock_irqsave(&events_lock, flags);
856 if (events_check_enabled) {
857 unsigned int cnt, inpr;
859 split_counters(&cnt, &inpr);
860 ret = (cnt != saved_count || inpr > 0);
861 events_check_enabled = !ret;
863 raw_spin_unlock_irqrestore(&events_lock, flags);
866 pm_pr_dbg("Wakeup pending, aborting suspend\n");
867 pm_print_active_wakeup_sources();
870 return ret || atomic_read(&pm_abort_suspend) > 0;
873 void pm_system_wakeup(void)
875 atomic_inc(&pm_abort_suspend);
878 EXPORT_SYMBOL_GPL(pm_system_wakeup);
880 void pm_system_cancel_wakeup(void)
882 atomic_dec_if_positive(&pm_abort_suspend);
885 void pm_wakeup_clear(bool reset)
889 atomic_set(&pm_abort_suspend, 0);
892 void pm_system_irq_wakeup(unsigned int irq_number)
894 if (pm_wakeup_irq == 0) {
895 pm_wakeup_irq = irq_number;
901 * pm_get_wakeup_count - Read the number of registered wakeup events.
902 * @count: Address to store the value at.
903 * @block: Whether or not to block.
905 * Store the number of registered wakeup events at the address in @count. If
906 * @block is set, block until the current number of wakeup events being
909 * Return 'false' if the current number of wakeup events being processed is
910 * nonzero. Otherwise return 'true'.
912 bool pm_get_wakeup_count(unsigned int *count, bool block)
914 unsigned int cnt, inpr;
920 prepare_to_wait(&wakeup_count_wait_queue, &wait,
922 split_counters(&cnt, &inpr);
923 if (inpr == 0 || signal_pending(current))
925 pm_print_active_wakeup_sources();
928 finish_wait(&wakeup_count_wait_queue, &wait);
931 split_counters(&cnt, &inpr);
937 * pm_save_wakeup_count - Save the current number of registered wakeup events.
938 * @count: Value to compare with the current number of registered wakeup events.
940 * If @count is equal to the current number of registered wakeup events and the
941 * current number of wakeup events being processed is zero, store @count as the
942 * old number of registered wakeup events for pm_check_wakeup_events(), enable
943 * wakeup events detection and return 'true'. Otherwise disable wakeup events
944 * detection and return 'false'.
946 bool pm_save_wakeup_count(unsigned int count)
948 unsigned int cnt, inpr;
951 events_check_enabled = false;
952 raw_spin_lock_irqsave(&events_lock, flags);
953 split_counters(&cnt, &inpr);
954 if (cnt == count && inpr == 0) {
956 events_check_enabled = true;
958 raw_spin_unlock_irqrestore(&events_lock, flags);
959 return events_check_enabled;
962 #ifdef CONFIG_PM_AUTOSLEEP
964 * pm_wakep_autosleep_enabled - Modify autosleep_enabled for all wakeup sources.
965 * @enabled: Whether to set or to clear the autosleep_enabled flags.
967 void pm_wakep_autosleep_enabled(bool set)
969 struct wakeup_source *ws;
970 ktime_t now = ktime_get();
973 srcuidx = srcu_read_lock(&wakeup_srcu);
974 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
975 spin_lock_irq(&ws->lock);
976 if (ws->autosleep_enabled != set) {
977 ws->autosleep_enabled = set;
980 ws->start_prevent_time = now;
982 update_prevent_sleep_time(ws, now);
985 spin_unlock_irq(&ws->lock);
987 srcu_read_unlock(&wakeup_srcu, srcuidx);
989 #endif /* CONFIG_PM_AUTOSLEEP */
992 * print_wakeup_source_stats - Print wakeup source statistics information.
993 * @m: seq_file to print the statistics into.
994 * @ws: Wakeup source object to print the statistics for.
996 static int print_wakeup_source_stats(struct seq_file *m,
997 struct wakeup_source *ws)
1002 unsigned long active_count;
1003 ktime_t active_time;
1004 ktime_t prevent_sleep_time;
1006 spin_lock_irqsave(&ws->lock, flags);
1008 total_time = ws->total_time;
1009 max_time = ws->max_time;
1010 prevent_sleep_time = ws->prevent_sleep_time;
1011 active_count = ws->active_count;
1013 ktime_t now = ktime_get();
1015 active_time = ktime_sub(now, ws->last_time);
1016 total_time = ktime_add(total_time, active_time);
1017 if (active_time > max_time)
1018 max_time = active_time;
1020 if (ws->autosleep_enabled)
1021 prevent_sleep_time = ktime_add(prevent_sleep_time,
1022 ktime_sub(now, ws->start_prevent_time));
1027 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",
1028 ws->name, active_count, ws->event_count,
1029 ws->wakeup_count, ws->expire_count,
1030 ktime_to_ms(active_time), ktime_to_ms(total_time),
1031 ktime_to_ms(max_time), ktime_to_ms(ws->last_time),
1032 ktime_to_ms(prevent_sleep_time));
1034 spin_unlock_irqrestore(&ws->lock, flags);
1039 static void *wakeup_sources_stats_seq_start(struct seq_file *m,
1042 struct wakeup_source *ws;
1044 int *srcuidx = m->private;
1047 seq_puts(m, "name\t\tactive_count\tevent_count\twakeup_count\t"
1048 "expire_count\tactive_since\ttotal_time\tmax_time\t"
1049 "last_change\tprevent_suspend_time\n");
1052 *srcuidx = srcu_read_lock(&wakeup_srcu);
1053 list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
1061 static void *wakeup_sources_stats_seq_next(struct seq_file *m,
1062 void *v, loff_t *pos)
1064 struct wakeup_source *ws = v;
1065 struct wakeup_source *next_ws = NULL;
1069 list_for_each_entry_continue_rcu(ws, &wakeup_sources, entry) {
1077 static void wakeup_sources_stats_seq_stop(struct seq_file *m, void *v)
1079 int *srcuidx = m->private;
1081 srcu_read_unlock(&wakeup_srcu, *srcuidx);
1085 * wakeup_sources_stats_seq_show - Print wakeup sources statistics information.
1086 * @m: seq_file to print the statistics into.
1087 * @v: wakeup_source of each iteration
1089 static int wakeup_sources_stats_seq_show(struct seq_file *m, void *v)
1091 struct wakeup_source *ws = v;
1093 print_wakeup_source_stats(m, ws);
1098 static const struct seq_operations wakeup_sources_stats_seq_ops = {
1099 .start = wakeup_sources_stats_seq_start,
1100 .next = wakeup_sources_stats_seq_next,
1101 .stop = wakeup_sources_stats_seq_stop,
1102 .show = wakeup_sources_stats_seq_show,
1105 static int wakeup_sources_stats_open(struct inode *inode, struct file *file)
1107 return seq_open_private(file, &wakeup_sources_stats_seq_ops, sizeof(int));
1110 static const struct file_operations wakeup_sources_stats_fops = {
1111 .owner = THIS_MODULE,
1112 .open = wakeup_sources_stats_open,
1114 .llseek = seq_lseek,
1115 .release = seq_release_private,
1118 static int __init wakeup_sources_debugfs_init(void)
1120 debugfs_create_file("wakeup_sources", S_IRUGO, NULL, NULL,
1121 &wakeup_sources_stats_fops);
1125 postcore_initcall(wakeup_sources_debugfs_init);