Branch data Line data Source code
1 : : // SPDX-License-Identifier: GPL-2.0
2 : : /*
3 : : * drivers/base/power/wakeup.c - System wakeup events framework
4 : : *
5 : : * Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
6 : : */
7 : : #define pr_fmt(fmt) "PM: " fmt
8 : :
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>
19 : :
20 : : #include "power.h"
21 : :
22 : : #ifndef CONFIG_SUSPEND
23 : : suspend_state_t pm_suspend_target_state;
24 : : #define pm_suspend_target_state (PM_SUSPEND_ON)
25 : : #endif
26 : :
27 : : /*
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.
30 : : */
31 : : bool events_check_enabled __read_mostly;
32 : :
33 : : /* First wakeup IRQ seen by the kernel in the last cycle. */
34 : : unsigned int pm_wakeup_irq __read_mostly;
35 : :
36 : : /* If greater than 0 and the system is suspending, terminate the suspend. */
37 : : static atomic_t pm_abort_suspend __read_mostly;
38 : :
39 : : /*
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.
43 : : */
44 : : static atomic_t combined_event_count = ATOMIC_INIT(0);
45 : :
46 : : #define IN_PROGRESS_BITS (sizeof(int) * 4)
47 : : #define MAX_IN_PROGRESS ((1 << IN_PROGRESS_BITS) - 1)
48 : :
49 : 0 : static void split_counters(unsigned int *cnt, unsigned int *inpr)
50 : : {
51 : 0 : unsigned int comb = atomic_read(&combined_event_count);
52 : :
53 : 0 : *cnt = (comb >> IN_PROGRESS_BITS);
54 : 0 : *inpr = comb & MAX_IN_PROGRESS;
55 : : }
56 : :
57 : : /* A preserved old value of the events counter. */
58 : : static unsigned int saved_count;
59 : :
60 : : static DEFINE_RAW_SPINLOCK(events_lock);
61 : :
62 : : static void pm_wakeup_timer_fn(struct timer_list *t);
63 : :
64 : : static LIST_HEAD(wakeup_sources);
65 : :
66 : : static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue);
67 : :
68 : : DEFINE_STATIC_SRCU(wakeup_srcu);
69 : :
70 : : static struct wakeup_source deleted_ws = {
71 : : .name = "deleted",
72 : : .lock = __SPIN_LOCK_UNLOCKED(deleted_ws.lock),
73 : : };
74 : :
75 : : static DEFINE_IDA(wakeup_ida);
76 : :
77 : : /**
78 : : * wakeup_source_create - Create a struct wakeup_source object.
79 : : * @name: Name of the new wakeup source.
80 : : */
81 : 33 : struct wakeup_source *wakeup_source_create(const char *name)
82 : : {
83 : 33 : struct wakeup_source *ws;
84 : 33 : const char *ws_name;
85 : 33 : int id;
86 : :
87 : 33 : ws = kzalloc(sizeof(*ws), GFP_KERNEL);
88 [ - + ]: 33 : if (!ws)
89 : 0 : goto err_ws;
90 : :
91 : 33 : ws_name = kstrdup_const(name, GFP_KERNEL);
92 [ - + ]: 33 : if (!ws_name)
93 : 0 : goto err_name;
94 : 33 : ws->name = ws_name;
95 : :
96 : 33 : id = ida_alloc(&wakeup_ida, GFP_KERNEL);
97 [ - + ]: 33 : if (id < 0)
98 : 0 : goto err_id;
99 : 33 : ws->id = id;
100 : :
101 : 33 : return ws;
102 : :
103 : : err_id:
104 : 0 : kfree_const(ws->name);
105 : 0 : err_name:
106 : 0 : kfree(ws);
107 : : err_ws:
108 : : return NULL;
109 : : }
110 : : EXPORT_SYMBOL_GPL(wakeup_source_create);
111 : :
112 : : /*
113 : : * Record wakeup_source statistics being deleted into a dummy wakeup_source.
114 : : */
115 : 3 : static void wakeup_source_record(struct wakeup_source *ws)
116 : : {
117 : 3 : unsigned long flags;
118 : :
119 : 3 : spin_lock_irqsave(&deleted_ws.lock, flags);
120 : :
121 [ - + ]: 3 : if (ws->event_count) {
122 : 0 : deleted_ws.total_time =
123 : 0 : ktime_add(deleted_ws.total_time, ws->total_time);
124 : 0 : deleted_ws.prevent_sleep_time =
125 : 0 : ktime_add(deleted_ws.prevent_sleep_time,
126 : : ws->prevent_sleep_time);
127 : 0 : deleted_ws.max_time =
128 [ # # ]: 0 : ktime_compare(deleted_ws.max_time, ws->max_time) > 0 ?
129 : : deleted_ws.max_time : ws->max_time;
130 : 0 : deleted_ws.event_count += ws->event_count;
131 : 0 : deleted_ws.active_count += ws->active_count;
132 : 0 : deleted_ws.relax_count += ws->relax_count;
133 : 0 : deleted_ws.expire_count += ws->expire_count;
134 : 0 : deleted_ws.wakeup_count += ws->wakeup_count;
135 : : }
136 : :
137 : 3 : spin_unlock_irqrestore(&deleted_ws.lock, flags);
138 : 3 : }
139 : :
140 : 3 : static void wakeup_source_free(struct wakeup_source *ws)
141 : : {
142 : 3 : ida_free(&wakeup_ida, ws->id);
143 : 3 : kfree_const(ws->name);
144 : 3 : kfree(ws);
145 : 3 : }
146 : :
147 : : /**
148 : : * wakeup_source_destroy - Destroy a struct wakeup_source object.
149 : : * @ws: Wakeup source to destroy.
150 : : *
151 : : * Use only for wakeup source objects created with wakeup_source_create().
152 : : */
153 : 3 : void wakeup_source_destroy(struct wakeup_source *ws)
154 : : {
155 [ + - ]: 3 : if (!ws)
156 : : return;
157 : :
158 : 3 : __pm_relax(ws);
159 : 3 : wakeup_source_record(ws);
160 : 3 : wakeup_source_free(ws);
161 : : }
162 : : EXPORT_SYMBOL_GPL(wakeup_source_destroy);
163 : :
164 : : /**
165 : : * wakeup_source_add - Add given object to the list of wakeup sources.
166 : : * @ws: Wakeup source object to add to the list.
167 : : */
168 : 33 : void wakeup_source_add(struct wakeup_source *ws)
169 : : {
170 : 33 : unsigned long flags;
171 : :
172 [ - + + - ]: 33 : if (WARN_ON(!ws))
173 : : return;
174 : :
175 : 33 : spin_lock_init(&ws->lock);
176 : 33 : timer_setup(&ws->timer, pm_wakeup_timer_fn, 0);
177 : 33 : ws->active = false;
178 : :
179 : 33 : raw_spin_lock_irqsave(&events_lock, flags);
180 : 33 : list_add_rcu(&ws->entry, &wakeup_sources);
181 : 33 : raw_spin_unlock_irqrestore(&events_lock, flags);
182 : : }
183 : : EXPORT_SYMBOL_GPL(wakeup_source_add);
184 : :
185 : : /**
186 : : * wakeup_source_remove - Remove given object from the wakeup sources list.
187 : : * @ws: Wakeup source object to remove from the list.
188 : : */
189 : 3 : void wakeup_source_remove(struct wakeup_source *ws)
190 : : {
191 : 3 : unsigned long flags;
192 : :
193 [ - + + - ]: 3 : if (WARN_ON(!ws))
194 : : return;
195 : :
196 : 3 : raw_spin_lock_irqsave(&events_lock, flags);
197 : 3 : list_del_rcu(&ws->entry);
198 : 3 : raw_spin_unlock_irqrestore(&events_lock, flags);
199 : 3 : synchronize_srcu(&wakeup_srcu);
200 : :
201 : 3 : del_timer_sync(&ws->timer);
202 : : /*
203 : : * Clear timer.function to make wakeup_source_not_registered() treat
204 : : * this wakeup source as not registered.
205 : : */
206 : 3 : ws->timer.function = NULL;
207 : : }
208 : : EXPORT_SYMBOL_GPL(wakeup_source_remove);
209 : :
210 : : /**
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.
214 : : */
215 : 33 : struct wakeup_source *wakeup_source_register(struct device *dev,
216 : : const char *name)
217 : : {
218 : 33 : struct wakeup_source *ws;
219 : 33 : int ret;
220 : :
221 : 33 : ws = wakeup_source_create(name);
222 [ + - ]: 33 : if (ws) {
223 [ + - + - ]: 33 : if (!dev || device_is_registered(dev)) {
224 : 33 : ret = wakeup_source_sysfs_add(dev, ws);
225 [ - + ]: 33 : if (ret) {
226 : 0 : wakeup_source_free(ws);
227 : 0 : return NULL;
228 : : }
229 : : }
230 : 33 : wakeup_source_add(ws);
231 : : }
232 : : return ws;
233 : : }
234 : : EXPORT_SYMBOL_GPL(wakeup_source_register);
235 : :
236 : : /**
237 : : * wakeup_source_unregister - Remove wakeup source from the list and remove it.
238 : : * @ws: Wakeup source object to unregister.
239 : : */
240 : 408 : void wakeup_source_unregister(struct wakeup_source *ws)
241 : : {
242 [ + + ]: 408 : if (ws) {
243 : 3 : wakeup_source_remove(ws);
244 : 3 : wakeup_source_sysfs_remove(ws);
245 : 3 : wakeup_source_destroy(ws);
246 : : }
247 : 408 : }
248 : : EXPORT_SYMBOL_GPL(wakeup_source_unregister);
249 : :
250 : : /**
251 : : * wakeup_sources_read_lock - Lock wakeup source list for read.
252 : : *
253 : : * Returns an index of srcu lock for struct wakeup_srcu.
254 : : * This index must be passed to the matching wakeup_sources_read_unlock().
255 : : */
256 : 0 : int wakeup_sources_read_lock(void)
257 : : {
258 : 0 : return srcu_read_lock(&wakeup_srcu);
259 : : }
260 : : EXPORT_SYMBOL_GPL(wakeup_sources_read_lock);
261 : :
262 : : /**
263 : : * wakeup_sources_read_unlock - Unlock wakeup source list.
264 : : * @idx: return value from corresponding wakeup_sources_read_lock()
265 : : */
266 : 0 : void wakeup_sources_read_unlock(int idx)
267 : : {
268 : 0 : srcu_read_unlock(&wakeup_srcu, idx);
269 : 0 : }
270 : : EXPORT_SYMBOL_GPL(wakeup_sources_read_unlock);
271 : :
272 : : /**
273 : : * wakeup_sources_walk_start - Begin a walk on wakeup source list
274 : : *
275 : : * Returns first object of the list of wakeup sources.
276 : : *
277 : : * Note that to be safe, wakeup sources list needs to be locked by calling
278 : : * wakeup_source_read_lock() for this.
279 : : */
280 : 0 : struct wakeup_source *wakeup_sources_walk_start(void)
281 : : {
282 : 0 : struct list_head *ws_head = &wakeup_sources;
283 : :
284 : 0 : return list_entry_rcu(ws_head->next, struct wakeup_source, entry);
285 : : }
286 : : EXPORT_SYMBOL_GPL(wakeup_sources_walk_start);
287 : :
288 : : /**
289 : : * wakeup_sources_walk_next - Get next wakeup source from the list
290 : : * @ws: Previous wakeup source object
291 : : *
292 : : * Note that to be safe, wakeup sources list needs to be locked by calling
293 : : * wakeup_source_read_lock() for this.
294 : : */
295 : 0 : struct wakeup_source *wakeup_sources_walk_next(struct wakeup_source *ws)
296 : : {
297 : 0 : struct list_head *ws_head = &wakeup_sources;
298 : :
299 [ # # ]: 0 : return list_next_or_null_rcu(ws_head, &ws->entry,
300 : : struct wakeup_source, entry);
301 : : }
302 : : EXPORT_SYMBOL_GPL(wakeup_sources_walk_next);
303 : :
304 : : /**
305 : : * device_wakeup_attach - Attach a wakeup source object to a device object.
306 : : * @dev: Device to handle.
307 : : * @ws: Wakeup source object to attach to @dev.
308 : : *
309 : : * This causes @dev to be treated as a wakeup device.
310 : : */
311 : 12 : static int device_wakeup_attach(struct device *dev, struct wakeup_source *ws)
312 : : {
313 : 12 : spin_lock_irq(&dev->power.lock);
314 [ + + ]: 12 : if (dev->power.wakeup) {
315 : 3 : spin_unlock_irq(&dev->power.lock);
316 : 3 : return -EEXIST;
317 : : }
318 : 9 : dev->power.wakeup = ws;
319 [ - + ]: 9 : if (dev->power.wakeirq)
320 : 0 : device_wakeup_attach_irq(dev, dev->power.wakeirq);
321 : 9 : spin_unlock_irq(&dev->power.lock);
322 : 9 : return 0;
323 : : }
324 : :
325 : : /**
326 : : * device_wakeup_enable - Enable given device to be a wakeup source.
327 : : * @dev: Device to handle.
328 : : *
329 : : * Create a wakeup source object, register it and attach it to @dev.
330 : : */
331 : 15 : int device_wakeup_enable(struct device *dev)
332 : : {
333 : 15 : struct wakeup_source *ws;
334 : 15 : int ret;
335 : :
336 [ + - + + ]: 15 : if (!dev || !dev->power.can_wakeup)
337 : : return -EINVAL;
338 : :
339 : 12 : if (pm_suspend_target_state != PM_SUSPEND_ON)
340 : : dev_dbg(dev, "Suspicious %s() during system transition!\n", __func__);
341 : :
342 [ + - ]: 24 : ws = wakeup_source_register(dev, dev_name(dev));
343 [ + - ]: 12 : if (!ws)
344 : : return -ENOMEM;
345 : :
346 : 12 : ret = device_wakeup_attach(dev, ws);
347 [ + + ]: 12 : if (ret)
348 : 3 : wakeup_source_unregister(ws);
349 : :
350 : : return ret;
351 : : }
352 : : EXPORT_SYMBOL_GPL(device_wakeup_enable);
353 : :
354 : : /**
355 : : * device_wakeup_attach_irq - Attach a wakeirq to a wakeup source
356 : : * @dev: Device to handle
357 : : * @wakeirq: Device specific wakeirq entry
358 : : *
359 : : * Attach a device wakeirq to the wakeup source so the device
360 : : * wake IRQ can be configured automatically for suspend and
361 : : * resume.
362 : : *
363 : : * Call under the device's power.lock lock.
364 : : */
365 : 0 : void device_wakeup_attach_irq(struct device *dev,
366 : : struct wake_irq *wakeirq)
367 : : {
368 : 0 : struct wakeup_source *ws;
369 : :
370 : 0 : ws = dev->power.wakeup;
371 [ # # # # ]: 0 : if (!ws)
372 : : return;
373 : :
374 [ # # # # ]: 0 : if (ws->wakeirq)
375 : 0 : dev_err(dev, "Leftover wakeup IRQ found, overriding\n");
376 : :
377 : 0 : ws->wakeirq = wakeirq;
378 : : }
379 : :
380 : : /**
381 : : * device_wakeup_detach_irq - Detach a wakeirq from a wakeup source
382 : : * @dev: Device to handle
383 : : *
384 : : * Removes a device wakeirq from the wakeup source.
385 : : *
386 : : * Call under the device's power.lock lock.
387 : : */
388 : 0 : void device_wakeup_detach_irq(struct device *dev)
389 : : {
390 : 0 : struct wakeup_source *ws;
391 : :
392 : 0 : ws = dev->power.wakeup;
393 [ # # ]: 0 : if (ws)
394 : 0 : ws->wakeirq = NULL;
395 : 0 : }
396 : :
397 : : /**
398 : : * device_wakeup_arm_wake_irqs(void)
399 : : *
400 : : * Itereates over the list of device wakeirqs to arm them.
401 : : */
402 : 0 : void device_wakeup_arm_wake_irqs(void)
403 : : {
404 : 0 : struct wakeup_source *ws;
405 : 0 : int srcuidx;
406 : :
407 : 0 : srcuidx = srcu_read_lock(&wakeup_srcu);
408 [ # # ]: 0 : list_for_each_entry_rcu(ws, &wakeup_sources, entry)
409 : 0 : dev_pm_arm_wake_irq(ws->wakeirq);
410 : 0 : srcu_read_unlock(&wakeup_srcu, srcuidx);
411 : 0 : }
412 : :
413 : : /**
414 : : * device_wakeup_disarm_wake_irqs(void)
415 : : *
416 : : * Itereates over the list of device wakeirqs to disarm them.
417 : : */
418 : 0 : void device_wakeup_disarm_wake_irqs(void)
419 : : {
420 : 0 : struct wakeup_source *ws;
421 : 0 : int srcuidx;
422 : :
423 : 0 : srcuidx = srcu_read_lock(&wakeup_srcu);
424 [ # # ]: 0 : list_for_each_entry_rcu(ws, &wakeup_sources, entry)
425 : 0 : dev_pm_disarm_wake_irq(ws->wakeirq);
426 : 0 : srcu_read_unlock(&wakeup_srcu, srcuidx);
427 : 0 : }
428 : :
429 : : /**
430 : : * device_wakeup_detach - Detach a device's wakeup source object from it.
431 : : * @dev: Device to detach the wakeup source object from.
432 : : *
433 : : * After it returns, @dev will not be treated as a wakeup device any more.
434 : : */
435 : 0 : static struct wakeup_source *device_wakeup_detach(struct device *dev)
436 : : {
437 : 0 : struct wakeup_source *ws;
438 : :
439 : 0 : spin_lock_irq(&dev->power.lock);
440 : 0 : ws = dev->power.wakeup;
441 : 0 : dev->power.wakeup = NULL;
442 : 0 : spin_unlock_irq(&dev->power.lock);
443 : 0 : return ws;
444 : : }
445 : :
446 : : /**
447 : : * device_wakeup_disable - Do not regard a device as a wakeup source any more.
448 : : * @dev: Device to handle.
449 : : *
450 : : * Detach the @dev's wakeup source object from it, unregister this wakeup source
451 : : * object and destroy it.
452 : : */
453 : 0 : int device_wakeup_disable(struct device *dev)
454 : : {
455 : 0 : struct wakeup_source *ws;
456 : :
457 [ # # # # ]: 0 : if (!dev || !dev->power.can_wakeup)
458 : : return -EINVAL;
459 : :
460 : 0 : ws = device_wakeup_detach(dev);
461 : 0 : wakeup_source_unregister(ws);
462 : 0 : return 0;
463 : : }
464 : : EXPORT_SYMBOL_GPL(device_wakeup_disable);
465 : :
466 : : /**
467 : : * device_set_wakeup_capable - Set/reset device wakeup capability flag.
468 : : * @dev: Device to handle.
469 : : * @capable: Whether or not @dev is capable of waking up the system from sleep.
470 : : *
471 : : * If @capable is set, set the @dev's power.can_wakeup flag and add its
472 : : * wakeup-related attributes to sysfs. Otherwise, unset the @dev's
473 : : * power.can_wakeup flag and remove its wakeup-related attributes from sysfs.
474 : : *
475 : : * This function may sleep and it can't be called from any context where
476 : : * sleeping is not allowed.
477 : : */
478 : 51 : void device_set_wakeup_capable(struct device *dev, bool capable)
479 : : {
480 [ + + ]: 51 : if (!!dev->power.can_wakeup == !!capable)
481 : : return;
482 : :
483 : 27 : dev->power.can_wakeup = capable;
484 [ + + + - ]: 27 : if (device_is_registered(dev) && !list_empty(&dev->power.entry)) {
485 [ + - ]: 21 : if (capable) {
486 : 21 : int ret = wakeup_sysfs_add(dev);
487 : :
488 [ - + ]: 21 : if (ret)
489 : 0 : dev_info(dev, "Wakeup sysfs attributes not added\n");
490 : : } else {
491 : 0 : wakeup_sysfs_remove(dev);
492 : : }
493 : : }
494 : : }
495 : : EXPORT_SYMBOL_GPL(device_set_wakeup_capable);
496 : :
497 : : /**
498 : : * device_init_wakeup - Device wakeup initialization.
499 : : * @dev: Device to handle.
500 : : * @enable: Whether or not to enable @dev as a wakeup device.
501 : : *
502 : : * By default, most devices should leave wakeup disabled. The exceptions are
503 : : * devices that everyone expects to be wakeup sources: keyboards, power buttons,
504 : : * possibly network interfaces, etc. Also, devices that don't generate their
505 : : * own wakeup requests but merely forward requests from one bus to another
506 : : * (like PCI bridges) should have wakeup enabled by default.
507 : : */
508 : 12 : int device_init_wakeup(struct device *dev, bool enable)
509 : : {
510 : 12 : int ret = 0;
511 : :
512 [ + - ]: 12 : if (!dev)
513 : : return -EINVAL;
514 : :
515 [ + - ]: 12 : if (enable) {
516 : 12 : device_set_wakeup_capable(dev, true);
517 : 12 : ret = device_wakeup_enable(dev);
518 : : } else {
519 : 0 : device_wakeup_disable(dev);
520 : 0 : device_set_wakeup_capable(dev, false);
521 : : }
522 : :
523 : : return ret;
524 : : }
525 : : EXPORT_SYMBOL_GPL(device_init_wakeup);
526 : :
527 : : /**
528 : : * device_set_wakeup_enable - Enable or disable a device to wake up the system.
529 : : * @dev: Device to handle.
530 : : */
531 : 3 : int device_set_wakeup_enable(struct device *dev, bool enable)
532 : : {
533 [ + - ]: 3 : return enable ? device_wakeup_enable(dev) : device_wakeup_disable(dev);
534 : : }
535 : : EXPORT_SYMBOL_GPL(device_set_wakeup_enable);
536 : :
537 : : /**
538 : : * wakeup_source_not_registered - validate the given wakeup source.
539 : : * @ws: Wakeup source to be validated.
540 : : */
541 : 0 : static bool wakeup_source_not_registered(struct wakeup_source *ws)
542 : : {
543 : : /*
544 : : * Use timer struct to check if the given source is initialized
545 : : * by wakeup_source_add.
546 : : */
547 : 0 : return ws->timer.function != pm_wakeup_timer_fn;
548 : : }
549 : :
550 : : /*
551 : : * The functions below use the observation that each wakeup event starts a
552 : : * period in which the system should not be suspended. The moment this period
553 : : * will end depends on how the wakeup event is going to be processed after being
554 : : * detected and all of the possible cases can be divided into two distinct
555 : : * groups.
556 : : *
557 : : * First, a wakeup event may be detected by the same functional unit that will
558 : : * carry out the entire processing of it and possibly will pass it to user space
559 : : * for further processing. In that case the functional unit that has detected
560 : : * the event may later "close" the "no suspend" period associated with it
561 : : * directly as soon as it has been dealt with. The pair of pm_stay_awake() and
562 : : * pm_relax(), balanced with each other, is supposed to be used in such
563 : : * situations.
564 : : *
565 : : * Second, a wakeup event may be detected by one functional unit and processed
566 : : * by another one. In that case the unit that has detected it cannot really
567 : : * "close" the "no suspend" period associated with it, unless it knows in
568 : : * advance what's going to happen to the event during processing. This
569 : : * knowledge, however, may not be available to it, so it can simply specify time
570 : : * to wait before the system can be suspended and pass it as the second
571 : : * argument of pm_wakeup_event().
572 : : *
573 : : * It is valid to call pm_relax() after pm_wakeup_event(), in which case the
574 : : * "no suspend" period will be ended either by the pm_relax(), or by the timer
575 : : * function executed when the timer expires, whichever comes first.
576 : : */
577 : :
578 : : /**
579 : : * wakup_source_activate - Mark given wakeup source as active.
580 : : * @ws: Wakeup source to handle.
581 : : *
582 : : * Update the @ws' statistics and, if @ws has just been activated, notify the PM
583 : : * core of the event by incrementing the counter of of wakeup events being
584 : : * processed.
585 : : */
586 : 0 : static void wakeup_source_activate(struct wakeup_source *ws)
587 : : {
588 : 0 : unsigned int cec;
589 : :
590 [ # # # # : 0 : if (WARN_ONCE(wakeup_source_not_registered(ws),
# # ]
591 : : "unregistered wakeup source\n"))
592 : : return;
593 : :
594 : 0 : ws->active = true;
595 : 0 : ws->active_count++;
596 : 0 : ws->last_time = ktime_get();
597 [ # # ]: 0 : if (ws->autosleep_enabled)
598 : 0 : ws->start_prevent_time = ws->last_time;
599 : :
600 : : /* Increment the counter of events in progress. */
601 : 0 : cec = atomic_inc_return(&combined_event_count);
602 : :
603 : 0 : trace_wakeup_source_activate(ws->name, cec);
604 : : }
605 : :
606 : : /**
607 : : * wakeup_source_report_event - Report wakeup event using the given source.
608 : : * @ws: Wakeup source to report the event for.
609 : : * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
610 : : */
611 : 0 : static void wakeup_source_report_event(struct wakeup_source *ws, bool hard)
612 : : {
613 : 0 : ws->event_count++;
614 : : /* This is racy, but the counter is approximate anyway. */
615 [ # # ]: 0 : if (events_check_enabled)
616 : 0 : ws->wakeup_count++;
617 : :
618 [ # # ]: 0 : if (!ws->active)
619 : 0 : wakeup_source_activate(ws);
620 : :
621 [ # # ]: 0 : if (hard)
622 : 0 : pm_system_wakeup();
623 : 0 : }
624 : :
625 : : /**
626 : : * __pm_stay_awake - Notify the PM core of a wakeup event.
627 : : * @ws: Wakeup source object associated with the source of the event.
628 : : *
629 : : * It is safe to call this function from interrupt context.
630 : : */
631 : 0 : void __pm_stay_awake(struct wakeup_source *ws)
632 : : {
633 : 0 : unsigned long flags;
634 : :
635 [ # # ]: 0 : if (!ws)
636 : : return;
637 : :
638 : 0 : spin_lock_irqsave(&ws->lock, flags);
639 : :
640 : 0 : wakeup_source_report_event(ws, false);
641 : 0 : del_timer(&ws->timer);
642 : 0 : ws->timer_expires = 0;
643 : :
644 : 0 : spin_unlock_irqrestore(&ws->lock, flags);
645 : : }
646 : : EXPORT_SYMBOL_GPL(__pm_stay_awake);
647 : :
648 : : /**
649 : : * pm_stay_awake - Notify the PM core that a wakeup event is being processed.
650 : : * @dev: Device the wakeup event is related to.
651 : : *
652 : : * Notify the PM core of a wakeup event (signaled by @dev) by calling
653 : : * __pm_stay_awake for the @dev's wakeup source object.
654 : : *
655 : : * Call this function after detecting of a wakeup event if pm_relax() is going
656 : : * to be called directly after processing the event (and possibly passing it to
657 : : * user space for further processing).
658 : : */
659 : 0 : void pm_stay_awake(struct device *dev)
660 : : {
661 : 0 : unsigned long flags;
662 : :
663 [ # # ]: 0 : if (!dev)
664 : : return;
665 : :
666 : 0 : spin_lock_irqsave(&dev->power.lock, flags);
667 : 0 : __pm_stay_awake(dev->power.wakeup);
668 : 0 : spin_unlock_irqrestore(&dev->power.lock, flags);
669 : : }
670 : : EXPORT_SYMBOL_GPL(pm_stay_awake);
671 : :
672 : : #ifdef CONFIG_PM_AUTOSLEEP
673 : : static void update_prevent_sleep_time(struct wakeup_source *ws, ktime_t now)
674 : : {
675 : : ktime_t delta = ktime_sub(now, ws->start_prevent_time);
676 : : ws->prevent_sleep_time = ktime_add(ws->prevent_sleep_time, delta);
677 : : }
678 : : #else
679 : : static inline void update_prevent_sleep_time(struct wakeup_source *ws,
680 : : ktime_t now) {}
681 : : #endif
682 : :
683 : : /**
684 : : * wakup_source_deactivate - Mark given wakeup source as inactive.
685 : : * @ws: Wakeup source to handle.
686 : : *
687 : : * Update the @ws' statistics and notify the PM core that the wakeup source has
688 : : * become inactive by decrementing the counter of wakeup events being processed
689 : : * and incrementing the counter of registered wakeup events.
690 : : */
691 : 0 : static void wakeup_source_deactivate(struct wakeup_source *ws)
692 : : {
693 : 0 : unsigned int cnt, inpr, cec;
694 : 0 : ktime_t duration;
695 : 0 : ktime_t now;
696 : :
697 : 0 : ws->relax_count++;
698 : : /*
699 : : * __pm_relax() may be called directly or from a timer function.
700 : : * If it is called directly right after the timer function has been
701 : : * started, but before the timer function calls __pm_relax(), it is
702 : : * possible that __pm_stay_awake() will be called in the meantime and
703 : : * will set ws->active. Then, ws->active may be cleared immediately
704 : : * by the __pm_relax() called from the timer function, but in such a
705 : : * case ws->relax_count will be different from ws->active_count.
706 : : */
707 [ # # ]: 0 : if (ws->relax_count != ws->active_count) {
708 : 0 : ws->relax_count--;
709 : 0 : return;
710 : : }
711 : :
712 : 0 : ws->active = false;
713 : :
714 : 0 : now = ktime_get();
715 : 0 : duration = ktime_sub(now, ws->last_time);
716 : 0 : ws->total_time = ktime_add(ws->total_time, duration);
717 [ # # ]: 0 : if (ktime_to_ns(duration) > ktime_to_ns(ws->max_time))
718 : 0 : ws->max_time = duration;
719 : :
720 : 0 : ws->last_time = now;
721 : 0 : del_timer(&ws->timer);
722 : 0 : ws->timer_expires = 0;
723 : :
724 : 0 : if (ws->autosleep_enabled)
725 : : update_prevent_sleep_time(ws, now);
726 : :
727 : : /*
728 : : * Increment the counter of registered wakeup events and decrement the
729 : : * couter of wakeup events in progress simultaneously.
730 : : */
731 : 0 : cec = atomic_add_return(MAX_IN_PROGRESS, &combined_event_count);
732 : 0 : trace_wakeup_source_deactivate(ws->name, cec);
733 : :
734 : 0 : split_counters(&cnt, &inpr);
735 [ # # # # ]: 0 : if (!inpr && waitqueue_active(&wakeup_count_wait_queue))
736 : 0 : wake_up(&wakeup_count_wait_queue);
737 : : }
738 : :
739 : : /**
740 : : * __pm_relax - Notify the PM core that processing of a wakeup event has ended.
741 : : * @ws: Wakeup source object associated with the source of the event.
742 : : *
743 : : * Call this function for wakeup events whose processing started with calling
744 : : * __pm_stay_awake().
745 : : *
746 : : * It is safe to call it from interrupt context.
747 : : */
748 : 31655 : void __pm_relax(struct wakeup_source *ws)
749 : : {
750 : 31655 : unsigned long flags;
751 : :
752 [ + + ]: 31655 : if (!ws)
753 : : return;
754 : :
755 : 3 : spin_lock_irqsave(&ws->lock, flags);
756 [ - + ]: 3 : if (ws->active)
757 : 0 : wakeup_source_deactivate(ws);
758 : 3 : spin_unlock_irqrestore(&ws->lock, flags);
759 : : }
760 : : EXPORT_SYMBOL_GPL(__pm_relax);
761 : :
762 : : /**
763 : : * pm_relax - Notify the PM core that processing of a wakeup event has ended.
764 : : * @dev: Device that signaled the event.
765 : : *
766 : : * Execute __pm_relax() for the @dev's wakeup source object.
767 : : */
768 : 0 : void pm_relax(struct device *dev)
769 : : {
770 : 0 : unsigned long flags;
771 : :
772 [ # # ]: 0 : if (!dev)
773 : : return;
774 : :
775 : 0 : spin_lock_irqsave(&dev->power.lock, flags);
776 : 0 : __pm_relax(dev->power.wakeup);
777 : 0 : spin_unlock_irqrestore(&dev->power.lock, flags);
778 : : }
779 : : EXPORT_SYMBOL_GPL(pm_relax);
780 : :
781 : : /**
782 : : * pm_wakeup_timer_fn - Delayed finalization of a wakeup event.
783 : : * @data: Address of the wakeup source object associated with the event source.
784 : : *
785 : : * Call wakeup_source_deactivate() for the wakeup source whose address is stored
786 : : * in @data if it is currently active and its timer has not been canceled and
787 : : * the expiration time of the timer is not in future.
788 : : */
789 : 0 : static void pm_wakeup_timer_fn(struct timer_list *t)
790 : : {
791 : 0 : struct wakeup_source *ws = from_timer(ws, t, timer);
792 : 0 : unsigned long flags;
793 : :
794 : 0 : spin_lock_irqsave(&ws->lock, flags);
795 : :
796 [ # # # # ]: 0 : if (ws->active && ws->timer_expires
797 [ # # ]: 0 : && time_after_eq(jiffies, ws->timer_expires)) {
798 : 0 : wakeup_source_deactivate(ws);
799 : 0 : ws->expire_count++;
800 : : }
801 : :
802 : 0 : spin_unlock_irqrestore(&ws->lock, flags);
803 : 0 : }
804 : :
805 : : /**
806 : : * pm_wakeup_ws_event - Notify the PM core of a wakeup event.
807 : : * @ws: Wakeup source object associated with the event source.
808 : : * @msec: Anticipated event processing time (in milliseconds).
809 : : * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
810 : : *
811 : : * Notify the PM core of a wakeup event whose source is @ws that will take
812 : : * approximately @msec milliseconds to be processed by the kernel. If @ws is
813 : : * not active, activate it. If @msec is nonzero, set up the @ws' timer to
814 : : * execute pm_wakeup_timer_fn() in future.
815 : : *
816 : : * It is safe to call this function from interrupt context.
817 : : */
818 : 9 : void pm_wakeup_ws_event(struct wakeup_source *ws, unsigned int msec, bool hard)
819 : : {
820 : 9 : unsigned long flags;
821 : 9 : unsigned long expires;
822 : :
823 [ - + ]: 9 : if (!ws)
824 : : return;
825 : :
826 : 0 : spin_lock_irqsave(&ws->lock, flags);
827 : :
828 : 0 : wakeup_source_report_event(ws, hard);
829 : :
830 [ # # ]: 0 : if (!msec) {
831 : 0 : wakeup_source_deactivate(ws);
832 : 0 : goto unlock;
833 : : }
834 : :
835 [ # # ]: 0 : expires = jiffies + msecs_to_jiffies(msec);
836 : 0 : if (!expires)
837 : : expires = 1;
838 : :
839 [ # # # # ]: 0 : if (!ws->timer_expires || time_after(expires, ws->timer_expires)) {
840 : 0 : mod_timer(&ws->timer, expires);
841 : 0 : ws->timer_expires = expires;
842 : : }
843 : :
844 : 0 : unlock:
845 : 0 : spin_unlock_irqrestore(&ws->lock, flags);
846 : : }
847 : : EXPORT_SYMBOL_GPL(pm_wakeup_ws_event);
848 : :
849 : : /**
850 : : * pm_wakeup_dev_event - Notify the PM core of a wakeup event.
851 : : * @dev: Device the wakeup event is related to.
852 : : * @msec: Anticipated event processing time (in milliseconds).
853 : : * @hard: If set, abort suspends in progress and wake up from suspend-to-idle.
854 : : *
855 : : * Call pm_wakeup_ws_event() for the @dev's wakeup source object.
856 : : */
857 : 9 : void pm_wakeup_dev_event(struct device *dev, unsigned int msec, bool hard)
858 : : {
859 : 9 : unsigned long flags;
860 : :
861 [ + - ]: 9 : if (!dev)
862 : : return;
863 : :
864 : 9 : spin_lock_irqsave(&dev->power.lock, flags);
865 : 9 : pm_wakeup_ws_event(dev->power.wakeup, msec, hard);
866 : 9 : spin_unlock_irqrestore(&dev->power.lock, flags);
867 : : }
868 : : EXPORT_SYMBOL_GPL(pm_wakeup_dev_event);
869 : :
870 : 0 : void pm_print_active_wakeup_sources(void)
871 : : {
872 : 0 : struct wakeup_source *ws;
873 : 0 : int srcuidx, active = 0;
874 : 0 : struct wakeup_source *last_activity_ws = NULL;
875 : :
876 : 0 : srcuidx = srcu_read_lock(&wakeup_srcu);
877 [ # # ]: 0 : list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
878 [ # # ]: 0 : if (ws->active) {
879 : 0 : pm_pr_dbg("active wakeup source: %s\n", ws->name);
880 : 0 : active = 1;
881 [ # # # # ]: 0 : } else if (!active &&
882 : 0 : (!last_activity_ws ||
883 [ # # ]: 0 : ktime_to_ns(ws->last_time) >
884 [ # # ]: 0 : ktime_to_ns(last_activity_ws->last_time))) {
885 : : last_activity_ws = ws;
886 : : }
887 : : }
888 : :
889 [ # # ]: 0 : if (!active && last_activity_ws)
890 : 0 : pm_pr_dbg("last active wakeup source: %s\n",
891 : : last_activity_ws->name);
892 : 0 : srcu_read_unlock(&wakeup_srcu, srcuidx);
893 : 0 : }
894 : : EXPORT_SYMBOL_GPL(pm_print_active_wakeup_sources);
895 : :
896 : : /**
897 : : * pm_wakeup_pending - Check if power transition in progress should be aborted.
898 : : *
899 : : * Compare the current number of registered wakeup events with its preserved
900 : : * value from the past and return true if new wakeup events have been registered
901 : : * since the old value was stored. Also return true if the current number of
902 : : * wakeup events being processed is different from zero.
903 : : */
904 : 0 : bool pm_wakeup_pending(void)
905 : : {
906 : 0 : unsigned long flags;
907 : 0 : bool ret = false;
908 : :
909 : 0 : raw_spin_lock_irqsave(&events_lock, flags);
910 [ # # ]: 0 : if (events_check_enabled) {
911 : 0 : unsigned int cnt, inpr;
912 : :
913 : 0 : split_counters(&cnt, &inpr);
914 [ # # # # ]: 0 : ret = (cnt != saved_count || inpr > 0);
915 : 0 : events_check_enabled = !ret;
916 : : }
917 : 0 : raw_spin_unlock_irqrestore(&events_lock, flags);
918 : :
919 [ # # ]: 0 : if (ret) {
920 : 0 : pm_pr_dbg("Wakeup pending, aborting suspend\n");
921 : 0 : pm_print_active_wakeup_sources();
922 : : }
923 : :
924 [ # # # # ]: 0 : return ret || atomic_read(&pm_abort_suspend) > 0;
925 : : }
926 : :
927 : 0 : void pm_system_wakeup(void)
928 : : {
929 : 0 : atomic_inc(&pm_abort_suspend);
930 : 0 : s2idle_wake();
931 : 0 : }
932 : : EXPORT_SYMBOL_GPL(pm_system_wakeup);
933 : :
934 : 0 : void pm_system_cancel_wakeup(void)
935 : : {
936 : 0 : atomic_dec_if_positive(&pm_abort_suspend);
937 : 0 : }
938 : :
939 : 0 : void pm_wakeup_clear(bool reset)
940 : : {
941 : 0 : pm_wakeup_irq = 0;
942 [ # # ]: 0 : if (reset)
943 : 0 : atomic_set(&pm_abort_suspend, 0);
944 : 0 : }
945 : :
946 : 0 : void pm_system_irq_wakeup(unsigned int irq_number)
947 : : {
948 [ # # ]: 0 : if (pm_wakeup_irq == 0) {
949 : 0 : pm_wakeup_irq = irq_number;
950 : 0 : pm_system_wakeup();
951 : : }
952 : 0 : }
953 : :
954 : : /**
955 : : * pm_get_wakeup_count - Read the number of registered wakeup events.
956 : : * @count: Address to store the value at.
957 : : * @block: Whether or not to block.
958 : : *
959 : : * Store the number of registered wakeup events at the address in @count. If
960 : : * @block is set, block until the current number of wakeup events being
961 : : * processed is zero.
962 : : *
963 : : * Return 'false' if the current number of wakeup events being processed is
964 : : * nonzero. Otherwise return 'true'.
965 : : */
966 : 0 : bool pm_get_wakeup_count(unsigned int *count, bool block)
967 : : {
968 : 0 : unsigned int cnt, inpr;
969 : :
970 [ # # ]: 0 : if (block) {
971 : 0 : DEFINE_WAIT(wait);
972 : :
973 : 0 : for (;;) {
974 : 0 : prepare_to_wait(&wakeup_count_wait_queue, &wait,
975 : : TASK_INTERRUPTIBLE);
976 : 0 : split_counters(&cnt, &inpr);
977 [ # # # # ]: 0 : if (inpr == 0 || signal_pending(current))
978 : : break;
979 : 0 : pm_print_active_wakeup_sources();
980 : 0 : schedule();
981 : : }
982 : 0 : finish_wait(&wakeup_count_wait_queue, &wait);
983 : : }
984 : :
985 : 0 : split_counters(&cnt, &inpr);
986 : 0 : *count = cnt;
987 : 0 : return !inpr;
988 : : }
989 : :
990 : : /**
991 : : * pm_save_wakeup_count - Save the current number of registered wakeup events.
992 : : * @count: Value to compare with the current number of registered wakeup events.
993 : : *
994 : : * If @count is equal to the current number of registered wakeup events and the
995 : : * current number of wakeup events being processed is zero, store @count as the
996 : : * old number of registered wakeup events for pm_check_wakeup_events(), enable
997 : : * wakeup events detection and return 'true'. Otherwise disable wakeup events
998 : : * detection and return 'false'.
999 : : */
1000 : 0 : bool pm_save_wakeup_count(unsigned int count)
1001 : : {
1002 : 0 : unsigned int cnt, inpr;
1003 : 0 : unsigned long flags;
1004 : :
1005 : 0 : events_check_enabled = false;
1006 : 0 : raw_spin_lock_irqsave(&events_lock, flags);
1007 : 0 : split_counters(&cnt, &inpr);
1008 [ # # # # ]: 0 : if (cnt == count && inpr == 0) {
1009 : 0 : saved_count = count;
1010 : 0 : events_check_enabled = true;
1011 : : }
1012 : 0 : raw_spin_unlock_irqrestore(&events_lock, flags);
1013 : 0 : return events_check_enabled;
1014 : : }
1015 : :
1016 : : #ifdef CONFIG_PM_AUTOSLEEP
1017 : : /**
1018 : : * pm_wakep_autosleep_enabled - Modify autosleep_enabled for all wakeup sources.
1019 : : * @enabled: Whether to set or to clear the autosleep_enabled flags.
1020 : : */
1021 : : void pm_wakep_autosleep_enabled(bool set)
1022 : : {
1023 : : struct wakeup_source *ws;
1024 : : ktime_t now = ktime_get();
1025 : : int srcuidx;
1026 : :
1027 : : srcuidx = srcu_read_lock(&wakeup_srcu);
1028 : : list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
1029 : : spin_lock_irq(&ws->lock);
1030 : : if (ws->autosleep_enabled != set) {
1031 : : ws->autosleep_enabled = set;
1032 : : if (ws->active) {
1033 : : if (set)
1034 : : ws->start_prevent_time = now;
1035 : : else
1036 : : update_prevent_sleep_time(ws, now);
1037 : : }
1038 : : }
1039 : : spin_unlock_irq(&ws->lock);
1040 : : }
1041 : : srcu_read_unlock(&wakeup_srcu, srcuidx);
1042 : : }
1043 : : #endif /* CONFIG_PM_AUTOSLEEP */
1044 : :
1045 : : /**
1046 : : * print_wakeup_source_stats - Print wakeup source statistics information.
1047 : : * @m: seq_file to print the statistics into.
1048 : : * @ws: Wakeup source object to print the statistics for.
1049 : : */
1050 : 0 : static int print_wakeup_source_stats(struct seq_file *m,
1051 : : struct wakeup_source *ws)
1052 : : {
1053 : 0 : unsigned long flags;
1054 : 0 : ktime_t total_time;
1055 : 0 : ktime_t max_time;
1056 : 0 : unsigned long active_count;
1057 : 0 : ktime_t active_time;
1058 : 0 : ktime_t prevent_sleep_time;
1059 : :
1060 : 0 : spin_lock_irqsave(&ws->lock, flags);
1061 : :
1062 : 0 : total_time = ws->total_time;
1063 : 0 : max_time = ws->max_time;
1064 : 0 : prevent_sleep_time = ws->prevent_sleep_time;
1065 : 0 : active_count = ws->active_count;
1066 [ # # ]: 0 : if (ws->active) {
1067 : 0 : ktime_t now = ktime_get();
1068 : :
1069 : 0 : active_time = ktime_sub(now, ws->last_time);
1070 : 0 : total_time = ktime_add(total_time, active_time);
1071 : 0 : if (active_time > max_time)
1072 : : max_time = active_time;
1073 : :
1074 [ # # ]: 0 : if (ws->autosleep_enabled)
1075 : 0 : prevent_sleep_time = ktime_add(prevent_sleep_time,
1076 : : ktime_sub(now, ws->start_prevent_time));
1077 : : } else {
1078 : : active_time = 0;
1079 : : }
1080 : :
1081 : 0 : 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",
1082 : : ws->name, active_count, ws->event_count,
1083 : : ws->wakeup_count, ws->expire_count,
1084 : : ktime_to_ms(active_time), ktime_to_ms(total_time),
1085 : : ktime_to_ms(max_time), ktime_to_ms(ws->last_time),
1086 : : ktime_to_ms(prevent_sleep_time));
1087 : :
1088 : 0 : spin_unlock_irqrestore(&ws->lock, flags);
1089 : :
1090 : 0 : return 0;
1091 : : }
1092 : :
1093 : 0 : static void *wakeup_sources_stats_seq_start(struct seq_file *m,
1094 : : loff_t *pos)
1095 : : {
1096 : 0 : struct wakeup_source *ws;
1097 : 0 : loff_t n = *pos;
1098 : 0 : int *srcuidx = m->private;
1099 : :
1100 [ # # ]: 0 : if (n == 0) {
1101 : 0 : seq_puts(m, "name\t\tactive_count\tevent_count\twakeup_count\t"
1102 : : "expire_count\tactive_since\ttotal_time\tmax_time\t"
1103 : : "last_change\tprevent_suspend_time\n");
1104 : : }
1105 : :
1106 : 0 : *srcuidx = srcu_read_lock(&wakeup_srcu);
1107 [ # # ]: 0 : list_for_each_entry_rcu(ws, &wakeup_sources, entry) {
1108 [ # # ]: 0 : if (n-- <= 0)
1109 : 0 : return ws;
1110 : : }
1111 : :
1112 : : return NULL;
1113 : : }
1114 : :
1115 : 0 : static void *wakeup_sources_stats_seq_next(struct seq_file *m,
1116 : : void *v, loff_t *pos)
1117 : : {
1118 : 0 : struct wakeup_source *ws = v;
1119 : 0 : struct wakeup_source *next_ws = NULL;
1120 : :
1121 : 0 : ++(*pos);
1122 : :
1123 [ # # ]: 0 : list_for_each_entry_continue_rcu(ws, &wakeup_sources, entry) {
1124 : 0 : next_ws = ws;
1125 : 0 : break;
1126 : : }
1127 : :
1128 [ # # ]: 0 : if (!next_ws)
1129 : 0 : print_wakeup_source_stats(m, &deleted_ws);
1130 : :
1131 : 0 : return next_ws;
1132 : : }
1133 : :
1134 : 0 : static void wakeup_sources_stats_seq_stop(struct seq_file *m, void *v)
1135 : : {
1136 : 0 : int *srcuidx = m->private;
1137 : :
1138 : 0 : srcu_read_unlock(&wakeup_srcu, *srcuidx);
1139 : 0 : }
1140 : :
1141 : : /**
1142 : : * wakeup_sources_stats_seq_show - Print wakeup sources statistics information.
1143 : : * @m: seq_file to print the statistics into.
1144 : : * @v: wakeup_source of each iteration
1145 : : */
1146 : 0 : static int wakeup_sources_stats_seq_show(struct seq_file *m, void *v)
1147 : : {
1148 : 0 : struct wakeup_source *ws = v;
1149 : :
1150 : 0 : print_wakeup_source_stats(m, ws);
1151 : :
1152 : 0 : return 0;
1153 : : }
1154 : :
1155 : : static const struct seq_operations wakeup_sources_stats_seq_ops = {
1156 : : .start = wakeup_sources_stats_seq_start,
1157 : : .next = wakeup_sources_stats_seq_next,
1158 : : .stop = wakeup_sources_stats_seq_stop,
1159 : : .show = wakeup_sources_stats_seq_show,
1160 : : };
1161 : :
1162 : 0 : static int wakeup_sources_stats_open(struct inode *inode, struct file *file)
1163 : : {
1164 : 0 : return seq_open_private(file, &wakeup_sources_stats_seq_ops, sizeof(int));
1165 : : }
1166 : :
1167 : : static const struct file_operations wakeup_sources_stats_fops = {
1168 : : .owner = THIS_MODULE,
1169 : : .open = wakeup_sources_stats_open,
1170 : : .read = seq_read,
1171 : : .llseek = seq_lseek,
1172 : : .release = seq_release_private,
1173 : : };
1174 : :
1175 : 3 : static int __init wakeup_sources_debugfs_init(void)
1176 : : {
1177 : 3 : debugfs_create_file("wakeup_sources", S_IRUGO, NULL, NULL,
1178 : : &wakeup_sources_stats_fops);
1179 : 3 : return 0;
1180 : : }
1181 : :
1182 : : postcore_initcall(wakeup_sources_debugfs_init);
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