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 /* If set and the system is suspending, terminate the suspend. */
29 static bool pm_abort_suspend __read_mostly
;
32 * Combined counters of registered wakeup events and wakeup events in progress.
33 * They need to be modified together atomically, so it's better to use one
34 * atomic variable to hold them both.
36 static atomic_t combined_event_count
= ATOMIC_INIT(0);
38 #define IN_PROGRESS_BITS (sizeof(int) * 4)
39 #define MAX_IN_PROGRESS ((1 << IN_PROGRESS_BITS) - 1)
41 static void split_counters(unsigned int *cnt
, unsigned int *inpr
)
43 unsigned int comb
= atomic_read(&combined_event_count
);
45 *cnt
= (comb
>> IN_PROGRESS_BITS
);
46 *inpr
= comb
& MAX_IN_PROGRESS
;
49 /* A preserved old value of the events counter. */
50 static unsigned int saved_count
;
52 static DEFINE_SPINLOCK(events_lock
);
54 static void pm_wakeup_timer_fn(unsigned long data
);
56 static LIST_HEAD(wakeup_sources
);
58 static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue
);
60 static struct wakeup_source deleted_ws
= {
62 .lock
= __SPIN_LOCK_UNLOCKED(deleted_ws
.lock
),
66 * wakeup_source_prepare - Prepare a new wakeup source for initialization.
67 * @ws: Wakeup source to prepare.
68 * @name: Pointer to the name of the new wakeup source.
70 * Callers must ensure that the @name string won't be freed when @ws is still in
73 void wakeup_source_prepare(struct wakeup_source
*ws
, const char *name
)
76 memset(ws
, 0, sizeof(*ws
));
80 EXPORT_SYMBOL_GPL(wakeup_source_prepare
);
83 * wakeup_source_create - Create a struct wakeup_source object.
84 * @name: Name of the new wakeup source.
86 struct wakeup_source
*wakeup_source_create(const char *name
)
88 struct wakeup_source
*ws
;
90 ws
= kmalloc(sizeof(*ws
), GFP_KERNEL
);
94 wakeup_source_prepare(ws
, name
? kstrdup(name
, GFP_KERNEL
) : NULL
);
97 EXPORT_SYMBOL_GPL(wakeup_source_create
);
100 * wakeup_source_drop - Prepare a struct wakeup_source object for destruction.
101 * @ws: Wakeup source to prepare for destruction.
103 * Callers must ensure that __pm_stay_awake() or __pm_wakeup_event() will never
104 * be run in parallel with this function for the same wakeup source object.
106 void wakeup_source_drop(struct wakeup_source
*ws
)
111 del_timer_sync(&ws
->timer
);
114 EXPORT_SYMBOL_GPL(wakeup_source_drop
);
117 * Record wakeup_source statistics being deleted into a dummy wakeup_source.
119 static void wakeup_source_record(struct wakeup_source
*ws
)
123 spin_lock_irqsave(&deleted_ws
.lock
, flags
);
125 if (ws
->event_count
) {
126 deleted_ws
.total_time
=
127 ktime_add(deleted_ws
.total_time
, ws
->total_time
);
128 deleted_ws
.prevent_sleep_time
=
129 ktime_add(deleted_ws
.prevent_sleep_time
,
130 ws
->prevent_sleep_time
);
131 deleted_ws
.max_time
=
132 ktime_compare(deleted_ws
.max_time
, ws
->max_time
) > 0 ?
133 deleted_ws
.max_time
: ws
->max_time
;
134 deleted_ws
.event_count
+= ws
->event_count
;
135 deleted_ws
.active_count
+= ws
->active_count
;
136 deleted_ws
.relax_count
+= ws
->relax_count
;
137 deleted_ws
.expire_count
+= ws
->expire_count
;
138 deleted_ws
.wakeup_count
+= ws
->wakeup_count
;
141 spin_unlock_irqrestore(&deleted_ws
.lock
, flags
);
145 * wakeup_source_destroy - Destroy a struct wakeup_source object.
146 * @ws: Wakeup source to destroy.
148 * Use only for wakeup source objects created with wakeup_source_create().
150 void wakeup_source_destroy(struct wakeup_source
*ws
)
155 wakeup_source_drop(ws
);
156 wakeup_source_record(ws
);
160 EXPORT_SYMBOL_GPL(wakeup_source_destroy
);
163 * wakeup_source_add - Add given object to the list of wakeup sources.
164 * @ws: Wakeup source object to add to the list.
166 void wakeup_source_add(struct wakeup_source
*ws
)
173 spin_lock_init(&ws
->lock
);
174 setup_timer(&ws
->timer
, pm_wakeup_timer_fn
, (unsigned long)ws
);
176 ws
->last_time
= ktime_get();
178 spin_lock_irqsave(&events_lock
, flags
);
179 list_add_rcu(&ws
->entry
, &wakeup_sources
);
180 spin_unlock_irqrestore(&events_lock
, flags
);
182 EXPORT_SYMBOL_GPL(wakeup_source_add
);
185 * wakeup_source_remove - Remove given object from the wakeup sources list.
186 * @ws: Wakeup source object to remove from the list.
188 void wakeup_source_remove(struct wakeup_source
*ws
)
195 spin_lock_irqsave(&events_lock
, flags
);
196 list_del_rcu(&ws
->entry
);
197 spin_unlock_irqrestore(&events_lock
, flags
);
200 EXPORT_SYMBOL_GPL(wakeup_source_remove
);
203 * wakeup_source_register - Create wakeup source and add it to the list.
204 * @name: Name of the wakeup source to register.
206 struct wakeup_source
*wakeup_source_register(const char *name
)
208 struct wakeup_source
*ws
;
210 ws
= wakeup_source_create(name
);
212 wakeup_source_add(ws
);
216 EXPORT_SYMBOL_GPL(wakeup_source_register
);
219 * wakeup_source_unregister - Remove wakeup source from the list and remove it.
220 * @ws: Wakeup source object to unregister.
222 void wakeup_source_unregister(struct wakeup_source
*ws
)
225 wakeup_source_remove(ws
);
226 wakeup_source_destroy(ws
);
229 EXPORT_SYMBOL_GPL(wakeup_source_unregister
);
232 * device_wakeup_attach - Attach a wakeup source object to a device object.
233 * @dev: Device to handle.
234 * @ws: Wakeup source object to attach to @dev.
236 * This causes @dev to be treated as a wakeup device.
238 static int device_wakeup_attach(struct device
*dev
, struct wakeup_source
*ws
)
240 spin_lock_irq(&dev
->power
.lock
);
241 if (dev
->power
.wakeup
) {
242 spin_unlock_irq(&dev
->power
.lock
);
245 dev
->power
.wakeup
= ws
;
246 spin_unlock_irq(&dev
->power
.lock
);
251 * device_wakeup_enable - Enable given device to be a wakeup source.
252 * @dev: Device to handle.
254 * Create a wakeup source object, register it and attach it to @dev.
256 int device_wakeup_enable(struct device
*dev
)
258 struct wakeup_source
*ws
;
261 if (!dev
|| !dev
->power
.can_wakeup
)
264 ws
= wakeup_source_register(dev_name(dev
));
268 ret
= device_wakeup_attach(dev
, ws
);
270 wakeup_source_unregister(ws
);
274 EXPORT_SYMBOL_GPL(device_wakeup_enable
);
277 * device_wakeup_attach_irq - Attach a wakeirq to a wakeup source
278 * @dev: Device to handle
279 * @wakeirq: Device specific wakeirq entry
281 * Attach a device wakeirq to the wakeup source so the device
282 * wake IRQ can be configured automatically for suspend and
285 * Call under the device's power.lock lock.
287 int device_wakeup_attach_irq(struct device
*dev
,
288 struct wake_irq
*wakeirq
)
290 struct wakeup_source
*ws
;
292 ws
= dev
->power
.wakeup
;
294 dev_err(dev
, "forgot to call call device_init_wakeup?\n");
301 ws
->wakeirq
= wakeirq
;
306 * device_wakeup_detach_irq - Detach a wakeirq from a wakeup source
307 * @dev: Device to handle
309 * Removes a device wakeirq from the wakeup source.
311 * Call under the device's power.lock lock.
313 void device_wakeup_detach_irq(struct device
*dev
)
315 struct wakeup_source
*ws
;
317 ws
= dev
->power
.wakeup
;
323 * device_wakeup_arm_wake_irqs(void)
325 * Itereates over the list of device wakeirqs to arm them.
327 void device_wakeup_arm_wake_irqs(void)
329 struct wakeup_source
*ws
;
332 list_for_each_entry_rcu(ws
, &wakeup_sources
, entry
) {
334 dev_pm_arm_wake_irq(ws
->wakeirq
);
340 * device_wakeup_disarm_wake_irqs(void)
342 * Itereates over the list of device wakeirqs to disarm them.
344 void device_wakeup_disarm_wake_irqs(void)
346 struct wakeup_source
*ws
;
349 list_for_each_entry_rcu(ws
, &wakeup_sources
, entry
) {
351 dev_pm_disarm_wake_irq(ws
->wakeirq
);
357 * device_wakeup_detach - Detach a device's wakeup source object from it.
358 * @dev: Device to detach the wakeup source object from.
360 * After it returns, @dev will not be treated as a wakeup device any more.
362 static struct wakeup_source
*device_wakeup_detach(struct device
*dev
)
364 struct wakeup_source
*ws
;
366 spin_lock_irq(&dev
->power
.lock
);
367 ws
= dev
->power
.wakeup
;
368 dev
->power
.wakeup
= NULL
;
369 spin_unlock_irq(&dev
->power
.lock
);
374 * device_wakeup_disable - Do not regard a device as a wakeup source any more.
375 * @dev: Device to handle.
377 * Detach the @dev's wakeup source object from it, unregister this wakeup source
378 * object and destroy it.
380 int device_wakeup_disable(struct device
*dev
)
382 struct wakeup_source
*ws
;
384 if (!dev
|| !dev
->power
.can_wakeup
)
387 ws
= device_wakeup_detach(dev
);
389 wakeup_source_unregister(ws
);
393 EXPORT_SYMBOL_GPL(device_wakeup_disable
);
396 * device_set_wakeup_capable - Set/reset device wakeup capability flag.
397 * @dev: Device to handle.
398 * @capable: Whether or not @dev is capable of waking up the system from sleep.
400 * If @capable is set, set the @dev's power.can_wakeup flag and add its
401 * wakeup-related attributes to sysfs. Otherwise, unset the @dev's
402 * power.can_wakeup flag and remove its wakeup-related attributes from sysfs.
404 * This function may sleep and it can't be called from any context where
405 * sleeping is not allowed.
407 void device_set_wakeup_capable(struct device
*dev
, bool capable
)
409 if (!!dev
->power
.can_wakeup
== !!capable
)
412 if (device_is_registered(dev
) && !list_empty(&dev
->power
.entry
)) {
414 if (wakeup_sysfs_add(dev
))
417 wakeup_sysfs_remove(dev
);
420 dev
->power
.can_wakeup
= capable
;
422 EXPORT_SYMBOL_GPL(device_set_wakeup_capable
);
425 * device_init_wakeup - Device wakeup initialization.
426 * @dev: Device to handle.
427 * @enable: Whether or not to enable @dev as a wakeup device.
429 * By default, most devices should leave wakeup disabled. The exceptions are
430 * devices that everyone expects to be wakeup sources: keyboards, power buttons,
431 * possibly network interfaces, etc. Also, devices that don't generate their
432 * own wakeup requests but merely forward requests from one bus to another
433 * (like PCI bridges) should have wakeup enabled by default.
435 int device_init_wakeup(struct device
*dev
, bool enable
)
443 device_set_wakeup_capable(dev
, true);
444 ret
= device_wakeup_enable(dev
);
446 if (dev
->power
.can_wakeup
)
447 device_wakeup_disable(dev
);
449 device_set_wakeup_capable(dev
, false);
454 EXPORT_SYMBOL_GPL(device_init_wakeup
);
457 * device_set_wakeup_enable - Enable or disable a device to wake up the system.
458 * @dev: Device to handle.
460 int device_set_wakeup_enable(struct device
*dev
, bool enable
)
462 if (!dev
|| !dev
->power
.can_wakeup
)
465 return enable
? device_wakeup_enable(dev
) : device_wakeup_disable(dev
);
467 EXPORT_SYMBOL_GPL(device_set_wakeup_enable
);
470 * wakeup_source_not_registered - validate the given wakeup source.
471 * @ws: Wakeup source to be validated.
473 static bool wakeup_source_not_registered(struct wakeup_source
*ws
)
476 * Use timer struct to check if the given source is initialized
477 * by wakeup_source_add.
479 return ws
->timer
.function
!= pm_wakeup_timer_fn
||
480 ws
->timer
.data
!= (unsigned long)ws
;
484 * The functions below use the observation that each wakeup event starts a
485 * period in which the system should not be suspended. The moment this period
486 * will end depends on how the wakeup event is going to be processed after being
487 * detected and all of the possible cases can be divided into two distinct
490 * First, a wakeup event may be detected by the same functional unit that will
491 * carry out the entire processing of it and possibly will pass it to user space
492 * for further processing. In that case the functional unit that has detected
493 * the event may later "close" the "no suspend" period associated with it
494 * directly as soon as it has been dealt with. The pair of pm_stay_awake() and
495 * pm_relax(), balanced with each other, is supposed to be used in such
498 * Second, a wakeup event may be detected by one functional unit and processed
499 * by another one. In that case the unit that has detected it cannot really
500 * "close" the "no suspend" period associated with it, unless it knows in
501 * advance what's going to happen to the event during processing. This
502 * knowledge, however, may not be available to it, so it can simply specify time
503 * to wait before the system can be suspended and pass it as the second
504 * argument of pm_wakeup_event().
506 * It is valid to call pm_relax() after pm_wakeup_event(), in which case the
507 * "no suspend" period will be ended either by the pm_relax(), or by the timer
508 * function executed when the timer expires, whichever comes first.
512 * wakup_source_activate - Mark given wakeup source as active.
513 * @ws: Wakeup source to handle.
515 * Update the @ws' statistics and, if @ws has just been activated, notify the PM
516 * core of the event by incrementing the counter of of wakeup events being
519 static void wakeup_source_activate(struct wakeup_source
*ws
)
523 if (WARN_ONCE(wakeup_source_not_registered(ws
),
524 "unregistered wakeup source\n"))
528 * active wakeup source should bring the system
529 * out of PM_SUSPEND_FREEZE state
535 ws
->last_time
= ktime_get();
536 if (ws
->autosleep_enabled
)
537 ws
->start_prevent_time
= ws
->last_time
;
539 /* Increment the counter of events in progress. */
540 cec
= atomic_inc_return(&combined_event_count
);
542 trace_wakeup_source_activate(ws
->name
, cec
);
546 * wakeup_source_report_event - Report wakeup event using the given source.
547 * @ws: Wakeup source to report the event for.
549 static void wakeup_source_report_event(struct wakeup_source
*ws
)
552 /* This is racy, but the counter is approximate anyway. */
553 if (events_check_enabled
)
557 wakeup_source_activate(ws
);
561 * __pm_stay_awake - Notify the PM core of a wakeup event.
562 * @ws: Wakeup source object associated with the source of the event.
564 * It is safe to call this function from interrupt context.
566 void __pm_stay_awake(struct wakeup_source
*ws
)
573 spin_lock_irqsave(&ws
->lock
, flags
);
575 wakeup_source_report_event(ws
);
576 del_timer(&ws
->timer
);
577 ws
->timer_expires
= 0;
579 spin_unlock_irqrestore(&ws
->lock
, flags
);
581 EXPORT_SYMBOL_GPL(__pm_stay_awake
);
584 * pm_stay_awake - Notify the PM core that a wakeup event is being processed.
585 * @dev: Device the wakeup event is related to.
587 * Notify the PM core of a wakeup event (signaled by @dev) by calling
588 * __pm_stay_awake for the @dev's wakeup source object.
590 * Call this function after detecting of a wakeup event if pm_relax() is going
591 * to be called directly after processing the event (and possibly passing it to
592 * user space for further processing).
594 void pm_stay_awake(struct device
*dev
)
601 spin_lock_irqsave(&dev
->power
.lock
, flags
);
602 __pm_stay_awake(dev
->power
.wakeup
);
603 spin_unlock_irqrestore(&dev
->power
.lock
, flags
);
605 EXPORT_SYMBOL_GPL(pm_stay_awake
);
607 #ifdef CONFIG_PM_AUTOSLEEP
608 static void update_prevent_sleep_time(struct wakeup_source
*ws
, ktime_t now
)
610 ktime_t delta
= ktime_sub(now
, ws
->start_prevent_time
);
611 ws
->prevent_sleep_time
= ktime_add(ws
->prevent_sleep_time
, delta
);
614 static inline void update_prevent_sleep_time(struct wakeup_source
*ws
,
619 * wakup_source_deactivate - Mark given wakeup source as inactive.
620 * @ws: Wakeup source to handle.
622 * Update the @ws' statistics and notify the PM core that the wakeup source has
623 * become inactive by decrementing the counter of wakeup events being processed
624 * and incrementing the counter of registered wakeup events.
626 static void wakeup_source_deactivate(struct wakeup_source
*ws
)
628 unsigned int cnt
, inpr
, cec
;
634 * __pm_relax() may be called directly or from a timer function.
635 * If it is called directly right after the timer function has been
636 * started, but before the timer function calls __pm_relax(), it is
637 * possible that __pm_stay_awake() will be called in the meantime and
638 * will set ws->active. Then, ws->active may be cleared immediately
639 * by the __pm_relax() called from the timer function, but in such a
640 * case ws->relax_count will be different from ws->active_count.
642 if (ws
->relax_count
!= ws
->active_count
) {
650 duration
= ktime_sub(now
, ws
->last_time
);
651 ws
->total_time
= ktime_add(ws
->total_time
, duration
);
652 if (ktime_to_ns(duration
) > ktime_to_ns(ws
->max_time
))
653 ws
->max_time
= duration
;
656 del_timer(&ws
->timer
);
657 ws
->timer_expires
= 0;
659 if (ws
->autosleep_enabled
)
660 update_prevent_sleep_time(ws
, now
);
663 * Increment the counter of registered wakeup events and decrement the
664 * couter of wakeup events in progress simultaneously.
666 cec
= atomic_add_return(MAX_IN_PROGRESS
, &combined_event_count
);
667 trace_wakeup_source_deactivate(ws
->name
, cec
);
669 split_counters(&cnt
, &inpr
);
670 if (!inpr
&& waitqueue_active(&wakeup_count_wait_queue
))
671 wake_up(&wakeup_count_wait_queue
);
675 * __pm_relax - Notify the PM core that processing of a wakeup event has ended.
676 * @ws: Wakeup source object associated with the source of the event.
678 * Call this function for wakeup events whose processing started with calling
681 * It is safe to call it from interrupt context.
683 void __pm_relax(struct wakeup_source
*ws
)
690 spin_lock_irqsave(&ws
->lock
, flags
);
692 wakeup_source_deactivate(ws
);
693 spin_unlock_irqrestore(&ws
->lock
, flags
);
695 EXPORT_SYMBOL_GPL(__pm_relax
);
698 * pm_relax - Notify the PM core that processing of a wakeup event has ended.
699 * @dev: Device that signaled the event.
701 * Execute __pm_relax() for the @dev's wakeup source object.
703 void pm_relax(struct device
*dev
)
710 spin_lock_irqsave(&dev
->power
.lock
, flags
);
711 __pm_relax(dev
->power
.wakeup
);
712 spin_unlock_irqrestore(&dev
->power
.lock
, flags
);
714 EXPORT_SYMBOL_GPL(pm_relax
);
717 * pm_wakeup_timer_fn - Delayed finalization of a wakeup event.
718 * @data: Address of the wakeup source object associated with the event source.
720 * Call wakeup_source_deactivate() for the wakeup source whose address is stored
721 * in @data if it is currently active and its timer has not been canceled and
722 * the expiration time of the timer is not in future.
724 static void pm_wakeup_timer_fn(unsigned long data
)
726 struct wakeup_source
*ws
= (struct wakeup_source
*)data
;
729 spin_lock_irqsave(&ws
->lock
, flags
);
731 if (ws
->active
&& ws
->timer_expires
732 && time_after_eq(jiffies
, ws
->timer_expires
)) {
733 wakeup_source_deactivate(ws
);
737 spin_unlock_irqrestore(&ws
->lock
, flags
);
741 * __pm_wakeup_event - Notify the PM core of a wakeup event.
742 * @ws: Wakeup source object associated with the event source.
743 * @msec: Anticipated event processing time (in milliseconds).
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_event(struct wakeup_source
*ws
, unsigned int msec
)
755 unsigned long expires
;
760 spin_lock_irqsave(&ws
->lock
, flags
);
762 wakeup_source_report_event(ws
);
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_event
);
785 * pm_wakeup_event - Notify the PM core of a wakeup event.
786 * @dev: Device the wakeup event is related to.
787 * @msec: Anticipated event processing time (in milliseconds).
789 * Call __pm_wakeup_event() for the @dev's wakeup source object.
791 void pm_wakeup_event(struct device
*dev
, unsigned int msec
)
798 spin_lock_irqsave(&dev
->power
.lock
, flags
);
799 __pm_wakeup_event(dev
->power
.wakeup
, msec
);
800 spin_unlock_irqrestore(&dev
->power
.lock
, flags
);
802 EXPORT_SYMBOL_GPL(pm_wakeup_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_info("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_info("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
|| pm_abort_suspend
;
861 void pm_system_wakeup(void)
863 pm_abort_suspend
= true;
866 EXPORT_SYMBOL_GPL(pm_system_wakeup
);
868 void pm_wakeup_clear(void)
870 pm_abort_suspend
= false;
874 * pm_get_wakeup_count - Read the number of registered wakeup events.
875 * @count: Address to store the value at.
876 * @block: Whether or not to block.
878 * Store the number of registered wakeup events at the address in @count. If
879 * @block is set, block until the current number of wakeup events being
882 * Return 'false' if the current number of wakeup events being processed is
883 * nonzero. Otherwise return 'true'.
885 bool pm_get_wakeup_count(unsigned int *count
, bool block
)
887 unsigned int cnt
, inpr
;
893 prepare_to_wait(&wakeup_count_wait_queue
, &wait
,
895 split_counters(&cnt
, &inpr
);
896 if (inpr
== 0 || signal_pending(current
))
901 finish_wait(&wakeup_count_wait_queue
, &wait
);
904 split_counters(&cnt
, &inpr
);
910 * pm_save_wakeup_count - Save the current number of registered wakeup events.
911 * @count: Value to compare with the current number of registered wakeup events.
913 * If @count is equal to the current number of registered wakeup events and the
914 * current number of wakeup events being processed is zero, store @count as the
915 * old number of registered wakeup events for pm_check_wakeup_events(), enable
916 * wakeup events detection and return 'true'. Otherwise disable wakeup events
917 * detection and return 'false'.
919 bool pm_save_wakeup_count(unsigned int count
)
921 unsigned int cnt
, inpr
;
924 events_check_enabled
= false;
925 spin_lock_irqsave(&events_lock
, flags
);
926 split_counters(&cnt
, &inpr
);
927 if (cnt
== count
&& inpr
== 0) {
929 events_check_enabled
= true;
931 spin_unlock_irqrestore(&events_lock
, flags
);
932 return events_check_enabled
;
935 #ifdef CONFIG_PM_AUTOSLEEP
937 * pm_wakep_autosleep_enabled - Modify autosleep_enabled for all wakeup sources.
938 * @enabled: Whether to set or to clear the autosleep_enabled flags.
940 void pm_wakep_autosleep_enabled(bool set
)
942 struct wakeup_source
*ws
;
943 ktime_t now
= ktime_get();
946 list_for_each_entry_rcu(ws
, &wakeup_sources
, entry
) {
947 spin_lock_irq(&ws
->lock
);
948 if (ws
->autosleep_enabled
!= set
) {
949 ws
->autosleep_enabled
= set
;
952 ws
->start_prevent_time
= now
;
954 update_prevent_sleep_time(ws
, now
);
957 spin_unlock_irq(&ws
->lock
);
961 #endif /* CONFIG_PM_AUTOSLEEP */
963 static struct dentry
*wakeup_sources_stats_dentry
;
966 * print_wakeup_source_stats - Print wakeup source statistics information.
967 * @m: seq_file to print the statistics into.
968 * @ws: Wakeup source object to print the statistics for.
970 static int print_wakeup_source_stats(struct seq_file
*m
,
971 struct wakeup_source
*ws
)
976 unsigned long active_count
;
978 ktime_t prevent_sleep_time
;
980 spin_lock_irqsave(&ws
->lock
, flags
);
982 total_time
= ws
->total_time
;
983 max_time
= ws
->max_time
;
984 prevent_sleep_time
= ws
->prevent_sleep_time
;
985 active_count
= ws
->active_count
;
987 ktime_t now
= ktime_get();
989 active_time
= ktime_sub(now
, ws
->last_time
);
990 total_time
= ktime_add(total_time
, active_time
);
991 if (active_time
.tv64
> max_time
.tv64
)
992 max_time
= active_time
;
994 if (ws
->autosleep_enabled
)
995 prevent_sleep_time
= ktime_add(prevent_sleep_time
,
996 ktime_sub(now
, ws
->start_prevent_time
));
998 active_time
= ktime_set(0, 0);
1001 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",
1002 ws
->name
, active_count
, ws
->event_count
,
1003 ws
->wakeup_count
, ws
->expire_count
,
1004 ktime_to_ms(active_time
), ktime_to_ms(total_time
),
1005 ktime_to_ms(max_time
), ktime_to_ms(ws
->last_time
),
1006 ktime_to_ms(prevent_sleep_time
));
1008 spin_unlock_irqrestore(&ws
->lock
, flags
);
1014 * wakeup_sources_stats_show - Print wakeup sources statistics information.
1015 * @m: seq_file to print the statistics into.
1017 static int wakeup_sources_stats_show(struct seq_file
*m
, void *unused
)
1019 struct wakeup_source
*ws
;
1021 seq_puts(m
, "name\t\tactive_count\tevent_count\twakeup_count\t"
1022 "expire_count\tactive_since\ttotal_time\tmax_time\t"
1023 "last_change\tprevent_suspend_time\n");
1026 list_for_each_entry_rcu(ws
, &wakeup_sources
, entry
)
1027 print_wakeup_source_stats(m
, ws
);
1030 print_wakeup_source_stats(m
, &deleted_ws
);
1035 static int wakeup_sources_stats_open(struct inode
*inode
, struct file
*file
)
1037 return single_open(file
, wakeup_sources_stats_show
, NULL
);
1040 static const struct file_operations wakeup_sources_stats_fops
= {
1041 .owner
= THIS_MODULE
,
1042 .open
= wakeup_sources_stats_open
,
1044 .llseek
= seq_lseek
,
1045 .release
= single_release
,
1048 static int __init
wakeup_sources_debugfs_init(void)
1050 wakeup_sources_stats_dentry
= debugfs_create_file("wakeup_sources",
1051 S_IRUGO
, NULL
, NULL
, &wakeup_sources_stats_fops
);
1055 postcore_initcall(wakeup_sources_debugfs_init
);