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c125e96f RW |
1 | /* |
2 | * drivers/base/power/wakeup.c - System wakeup events framework | |
3 | * | |
4 | * Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. | |
5 | * | |
6 | * This file is released under the GPLv2. | |
7 | */ | |
8 | ||
9 | #include <linux/device.h> | |
10 | #include <linux/slab.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/capability.h> | |
1b6bc32f | 13 | #include <linux/export.h> |
c125e96f | 14 | #include <linux/suspend.h> |
9c034392 RW |
15 | #include <linux/seq_file.h> |
16 | #include <linux/debugfs.h> | |
074037ec RW |
17 | |
18 | #include "power.h" | |
19 | ||
20 | #define TIMEOUT 100 | |
c125e96f RW |
21 | |
22 | /* | |
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. | |
25 | */ | |
26 | bool events_check_enabled; | |
27 | ||
023d3779 RW |
28 | /* |
29 | * Combined counters of registered wakeup events and wakeup events in progress. | |
30 | * They need to be modified together atomically, so it's better to use one | |
31 | * atomic variable to hold them both. | |
32 | */ | |
33 | static atomic_t combined_event_count = ATOMIC_INIT(0); | |
34 | ||
35 | #define IN_PROGRESS_BITS (sizeof(int) * 4) | |
36 | #define MAX_IN_PROGRESS ((1 << IN_PROGRESS_BITS) - 1) | |
37 | ||
38 | static void split_counters(unsigned int *cnt, unsigned int *inpr) | |
39 | { | |
40 | unsigned int comb = atomic_read(&combined_event_count); | |
41 | ||
42 | *cnt = (comb >> IN_PROGRESS_BITS); | |
43 | *inpr = comb & MAX_IN_PROGRESS; | |
44 | } | |
45 | ||
46 | /* A preserved old value of the events counter. */ | |
074037ec | 47 | static unsigned int saved_count; |
c125e96f RW |
48 | |
49 | static DEFINE_SPINLOCK(events_lock); | |
50 | ||
4eb241e5 RW |
51 | static void pm_wakeup_timer_fn(unsigned long data); |
52 | ||
074037ec RW |
53 | static LIST_HEAD(wakeup_sources); |
54 | ||
8671bbc1 RW |
55 | /** |
56 | * wakeup_source_prepare - Prepare a new wakeup source for initialization. | |
57 | * @ws: Wakeup source to prepare. | |
58 | * @name: Pointer to the name of the new wakeup source. | |
59 | * | |
60 | * Callers must ensure that the @name string won't be freed when @ws is still in | |
61 | * use. | |
62 | */ | |
63 | void wakeup_source_prepare(struct wakeup_source *ws, const char *name) | |
64 | { | |
65 | if (ws) { | |
66 | memset(ws, 0, sizeof(*ws)); | |
67 | ws->name = name; | |
68 | } | |
69 | } | |
70 | EXPORT_SYMBOL_GPL(wakeup_source_prepare); | |
71 | ||
074037ec RW |
72 | /** |
73 | * wakeup_source_create - Create a struct wakeup_source object. | |
74 | * @name: Name of the new wakeup source. | |
75 | */ | |
76 | struct wakeup_source *wakeup_source_create(const char *name) | |
77 | { | |
78 | struct wakeup_source *ws; | |
79 | ||
8671bbc1 | 80 | ws = kmalloc(sizeof(*ws), GFP_KERNEL); |
074037ec RW |
81 | if (!ws) |
82 | return NULL; | |
83 | ||
8671bbc1 | 84 | wakeup_source_prepare(ws, name ? kstrdup(name, GFP_KERNEL) : NULL); |
074037ec RW |
85 | return ws; |
86 | } | |
87 | EXPORT_SYMBOL_GPL(wakeup_source_create); | |
88 | ||
89 | /** | |
8671bbc1 RW |
90 | * wakeup_source_drop - Prepare a struct wakeup_source object for destruction. |
91 | * @ws: Wakeup source to prepare for destruction. | |
d94aff87 RW |
92 | * |
93 | * Callers must ensure that __pm_stay_awake() or __pm_wakeup_event() will never | |
94 | * be run in parallel with this function for the same wakeup source object. | |
074037ec | 95 | */ |
8671bbc1 | 96 | void wakeup_source_drop(struct wakeup_source *ws) |
074037ec RW |
97 | { |
98 | if (!ws) | |
99 | return; | |
100 | ||
d94aff87 RW |
101 | del_timer_sync(&ws->timer); |
102 | __pm_relax(ws); | |
8671bbc1 RW |
103 | } |
104 | EXPORT_SYMBOL_GPL(wakeup_source_drop); | |
105 | ||
106 | /** | |
107 | * wakeup_source_destroy - Destroy a struct wakeup_source object. | |
108 | * @ws: Wakeup source to destroy. | |
109 | * | |
110 | * Use only for wakeup source objects created with wakeup_source_create(). | |
111 | */ | |
112 | void wakeup_source_destroy(struct wakeup_source *ws) | |
113 | { | |
114 | if (!ws) | |
115 | return; | |
116 | ||
117 | wakeup_source_drop(ws); | |
074037ec RW |
118 | kfree(ws->name); |
119 | kfree(ws); | |
120 | } | |
121 | EXPORT_SYMBOL_GPL(wakeup_source_destroy); | |
122 | ||
123 | /** | |
124 | * wakeup_source_add - Add given object to the list of wakeup sources. | |
125 | * @ws: Wakeup source object to add to the list. | |
126 | */ | |
127 | void wakeup_source_add(struct wakeup_source *ws) | |
128 | { | |
129 | if (WARN_ON(!ws)) | |
130 | return; | |
131 | ||
7c95149b | 132 | spin_lock_init(&ws->lock); |
074037ec RW |
133 | setup_timer(&ws->timer, pm_wakeup_timer_fn, (unsigned long)ws); |
134 | ws->active = false; | |
135 | ||
136 | spin_lock_irq(&events_lock); | |
137 | list_add_rcu(&ws->entry, &wakeup_sources); | |
138 | spin_unlock_irq(&events_lock); | |
074037ec RW |
139 | } |
140 | EXPORT_SYMBOL_GPL(wakeup_source_add); | |
141 | ||
142 | /** | |
143 | * wakeup_source_remove - Remove given object from the wakeup sources list. | |
144 | * @ws: Wakeup source object to remove from the list. | |
145 | */ | |
146 | void wakeup_source_remove(struct wakeup_source *ws) | |
147 | { | |
148 | if (WARN_ON(!ws)) | |
149 | return; | |
150 | ||
151 | spin_lock_irq(&events_lock); | |
152 | list_del_rcu(&ws->entry); | |
153 | spin_unlock_irq(&events_lock); | |
154 | synchronize_rcu(); | |
155 | } | |
156 | EXPORT_SYMBOL_GPL(wakeup_source_remove); | |
157 | ||
158 | /** | |
159 | * wakeup_source_register - Create wakeup source and add it to the list. | |
160 | * @name: Name of the wakeup source to register. | |
161 | */ | |
162 | struct wakeup_source *wakeup_source_register(const char *name) | |
163 | { | |
164 | struct wakeup_source *ws; | |
165 | ||
166 | ws = wakeup_source_create(name); | |
167 | if (ws) | |
168 | wakeup_source_add(ws); | |
169 | ||
170 | return ws; | |
171 | } | |
172 | EXPORT_SYMBOL_GPL(wakeup_source_register); | |
173 | ||
174 | /** | |
175 | * wakeup_source_unregister - Remove wakeup source from the list and remove it. | |
176 | * @ws: Wakeup source object to unregister. | |
177 | */ | |
178 | void wakeup_source_unregister(struct wakeup_source *ws) | |
179 | { | |
8671bbc1 RW |
180 | if (ws) { |
181 | wakeup_source_remove(ws); | |
182 | wakeup_source_destroy(ws); | |
183 | } | |
074037ec RW |
184 | } |
185 | EXPORT_SYMBOL_GPL(wakeup_source_unregister); | |
186 | ||
187 | /** | |
188 | * device_wakeup_attach - Attach a wakeup source object to a device object. | |
189 | * @dev: Device to handle. | |
190 | * @ws: Wakeup source object to attach to @dev. | |
191 | * | |
192 | * This causes @dev to be treated as a wakeup device. | |
193 | */ | |
194 | static int device_wakeup_attach(struct device *dev, struct wakeup_source *ws) | |
195 | { | |
196 | spin_lock_irq(&dev->power.lock); | |
197 | if (dev->power.wakeup) { | |
198 | spin_unlock_irq(&dev->power.lock); | |
199 | return -EEXIST; | |
200 | } | |
201 | dev->power.wakeup = ws; | |
202 | spin_unlock_irq(&dev->power.lock); | |
203 | return 0; | |
204 | } | |
205 | ||
206 | /** | |
207 | * device_wakeup_enable - Enable given device to be a wakeup source. | |
208 | * @dev: Device to handle. | |
209 | * | |
210 | * Create a wakeup source object, register it and attach it to @dev. | |
211 | */ | |
212 | int device_wakeup_enable(struct device *dev) | |
213 | { | |
214 | struct wakeup_source *ws; | |
215 | int ret; | |
216 | ||
217 | if (!dev || !dev->power.can_wakeup) | |
218 | return -EINVAL; | |
219 | ||
220 | ws = wakeup_source_register(dev_name(dev)); | |
221 | if (!ws) | |
222 | return -ENOMEM; | |
223 | ||
224 | ret = device_wakeup_attach(dev, ws); | |
225 | if (ret) | |
226 | wakeup_source_unregister(ws); | |
227 | ||
228 | return ret; | |
229 | } | |
230 | EXPORT_SYMBOL_GPL(device_wakeup_enable); | |
231 | ||
232 | /** | |
233 | * device_wakeup_detach - Detach a device's wakeup source object from it. | |
234 | * @dev: Device to detach the wakeup source object from. | |
235 | * | |
236 | * After it returns, @dev will not be treated as a wakeup device any more. | |
237 | */ | |
238 | static struct wakeup_source *device_wakeup_detach(struct device *dev) | |
239 | { | |
240 | struct wakeup_source *ws; | |
241 | ||
242 | spin_lock_irq(&dev->power.lock); | |
243 | ws = dev->power.wakeup; | |
244 | dev->power.wakeup = NULL; | |
245 | spin_unlock_irq(&dev->power.lock); | |
246 | return ws; | |
247 | } | |
248 | ||
249 | /** | |
250 | * device_wakeup_disable - Do not regard a device as a wakeup source any more. | |
251 | * @dev: Device to handle. | |
252 | * | |
253 | * Detach the @dev's wakeup source object from it, unregister this wakeup source | |
254 | * object and destroy it. | |
255 | */ | |
256 | int device_wakeup_disable(struct device *dev) | |
257 | { | |
258 | struct wakeup_source *ws; | |
259 | ||
260 | if (!dev || !dev->power.can_wakeup) | |
261 | return -EINVAL; | |
262 | ||
263 | ws = device_wakeup_detach(dev); | |
264 | if (ws) | |
265 | wakeup_source_unregister(ws); | |
266 | ||
267 | return 0; | |
268 | } | |
269 | EXPORT_SYMBOL_GPL(device_wakeup_disable); | |
270 | ||
cb8f51bd RW |
271 | /** |
272 | * device_set_wakeup_capable - Set/reset device wakeup capability flag. | |
273 | * @dev: Device to handle. | |
274 | * @capable: Whether or not @dev is capable of waking up the system from sleep. | |
275 | * | |
276 | * If @capable is set, set the @dev's power.can_wakeup flag and add its | |
277 | * wakeup-related attributes to sysfs. Otherwise, unset the @dev's | |
278 | * power.can_wakeup flag and remove its wakeup-related attributes from sysfs. | |
279 | * | |
280 | * This function may sleep and it can't be called from any context where | |
281 | * sleeping is not allowed. | |
282 | */ | |
283 | void device_set_wakeup_capable(struct device *dev, bool capable) | |
284 | { | |
285 | if (!!dev->power.can_wakeup == !!capable) | |
286 | return; | |
287 | ||
22110faf | 288 | if (device_is_registered(dev) && !list_empty(&dev->power.entry)) { |
cb8f51bd RW |
289 | if (capable) { |
290 | if (wakeup_sysfs_add(dev)) | |
291 | return; | |
292 | } else { | |
293 | wakeup_sysfs_remove(dev); | |
294 | } | |
295 | } | |
296 | dev->power.can_wakeup = capable; | |
297 | } | |
298 | EXPORT_SYMBOL_GPL(device_set_wakeup_capable); | |
299 | ||
074037ec RW |
300 | /** |
301 | * device_init_wakeup - Device wakeup initialization. | |
302 | * @dev: Device to handle. | |
303 | * @enable: Whether or not to enable @dev as a wakeup device. | |
304 | * | |
305 | * By default, most devices should leave wakeup disabled. The exceptions are | |
306 | * devices that everyone expects to be wakeup sources: keyboards, power buttons, | |
8f88893c AS |
307 | * possibly network interfaces, etc. Also, devices that don't generate their |
308 | * own wakeup requests but merely forward requests from one bus to another | |
309 | * (like PCI bridges) should have wakeup enabled by default. | |
074037ec RW |
310 | */ |
311 | int device_init_wakeup(struct device *dev, bool enable) | |
312 | { | |
313 | int ret = 0; | |
314 | ||
315 | if (enable) { | |
316 | device_set_wakeup_capable(dev, true); | |
317 | ret = device_wakeup_enable(dev); | |
318 | } else { | |
319 | device_set_wakeup_capable(dev, false); | |
320 | } | |
321 | ||
322 | return ret; | |
323 | } | |
324 | EXPORT_SYMBOL_GPL(device_init_wakeup); | |
325 | ||
326 | /** | |
327 | * device_set_wakeup_enable - Enable or disable a device to wake up the system. | |
328 | * @dev: Device to handle. | |
329 | */ | |
330 | int device_set_wakeup_enable(struct device *dev, bool enable) | |
331 | { | |
332 | if (!dev || !dev->power.can_wakeup) | |
333 | return -EINVAL; | |
334 | ||
335 | return enable ? device_wakeup_enable(dev) : device_wakeup_disable(dev); | |
336 | } | |
337 | EXPORT_SYMBOL_GPL(device_set_wakeup_enable); | |
4eb241e5 | 338 | |
c125e96f RW |
339 | /* |
340 | * The functions below use the observation that each wakeup event starts a | |
341 | * period in which the system should not be suspended. The moment this period | |
342 | * will end depends on how the wakeup event is going to be processed after being | |
343 | * detected and all of the possible cases can be divided into two distinct | |
344 | * groups. | |
345 | * | |
346 | * First, a wakeup event may be detected by the same functional unit that will | |
347 | * carry out the entire processing of it and possibly will pass it to user space | |
348 | * for further processing. In that case the functional unit that has detected | |
349 | * the event may later "close" the "no suspend" period associated with it | |
350 | * directly as soon as it has been dealt with. The pair of pm_stay_awake() and | |
351 | * pm_relax(), balanced with each other, is supposed to be used in such | |
352 | * situations. | |
353 | * | |
354 | * Second, a wakeup event may be detected by one functional unit and processed | |
355 | * by another one. In that case the unit that has detected it cannot really | |
356 | * "close" the "no suspend" period associated with it, unless it knows in | |
357 | * advance what's going to happen to the event during processing. This | |
358 | * knowledge, however, may not be available to it, so it can simply specify time | |
359 | * to wait before the system can be suspended and pass it as the second | |
360 | * argument of pm_wakeup_event(). | |
074037ec RW |
361 | * |
362 | * It is valid to call pm_relax() after pm_wakeup_event(), in which case the | |
363 | * "no suspend" period will be ended either by the pm_relax(), or by the timer | |
364 | * function executed when the timer expires, whichever comes first. | |
c125e96f RW |
365 | */ |
366 | ||
074037ec RW |
367 | /** |
368 | * wakup_source_activate - Mark given wakeup source as active. | |
369 | * @ws: Wakeup source to handle. | |
370 | * | |
371 | * Update the @ws' statistics and, if @ws has just been activated, notify the PM | |
372 | * core of the event by incrementing the counter of of wakeup events being | |
373 | * processed. | |
374 | */ | |
375 | static void wakeup_source_activate(struct wakeup_source *ws) | |
376 | { | |
377 | ws->active = true; | |
378 | ws->active_count++; | |
074037ec RW |
379 | ws->last_time = ktime_get(); |
380 | ||
023d3779 RW |
381 | /* Increment the counter of events in progress. */ |
382 | atomic_inc(&combined_event_count); | |
074037ec RW |
383 | } |
384 | ||
385 | /** | |
386 | * __pm_stay_awake - Notify the PM core of a wakeup event. | |
387 | * @ws: Wakeup source object associated with the source of the event. | |
388 | * | |
389 | * It is safe to call this function from interrupt context. | |
390 | */ | |
391 | void __pm_stay_awake(struct wakeup_source *ws) | |
392 | { | |
393 | unsigned long flags; | |
394 | ||
395 | if (!ws) | |
396 | return; | |
397 | ||
398 | spin_lock_irqsave(&ws->lock, flags); | |
4782e165 | 399 | |
074037ec RW |
400 | ws->event_count++; |
401 | if (!ws->active) | |
402 | wakeup_source_activate(ws); | |
4782e165 RW |
403 | |
404 | del_timer(&ws->timer); | |
405 | ws->timer_expires = 0; | |
406 | ||
074037ec RW |
407 | spin_unlock_irqrestore(&ws->lock, flags); |
408 | } | |
409 | EXPORT_SYMBOL_GPL(__pm_stay_awake); | |
410 | ||
c125e96f RW |
411 | /** |
412 | * pm_stay_awake - Notify the PM core that a wakeup event is being processed. | |
413 | * @dev: Device the wakeup event is related to. | |
414 | * | |
074037ec RW |
415 | * Notify the PM core of a wakeup event (signaled by @dev) by calling |
416 | * __pm_stay_awake for the @dev's wakeup source object. | |
c125e96f RW |
417 | * |
418 | * Call this function after detecting of a wakeup event if pm_relax() is going | |
419 | * to be called directly after processing the event (and possibly passing it to | |
420 | * user space for further processing). | |
c125e96f RW |
421 | */ |
422 | void pm_stay_awake(struct device *dev) | |
423 | { | |
424 | unsigned long flags; | |
425 | ||
074037ec RW |
426 | if (!dev) |
427 | return; | |
c125e96f | 428 | |
074037ec RW |
429 | spin_lock_irqsave(&dev->power.lock, flags); |
430 | __pm_stay_awake(dev->power.wakeup); | |
431 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
c125e96f | 432 | } |
074037ec | 433 | EXPORT_SYMBOL_GPL(pm_stay_awake); |
c125e96f RW |
434 | |
435 | /** | |
074037ec RW |
436 | * wakup_source_deactivate - Mark given wakeup source as inactive. |
437 | * @ws: Wakeup source to handle. | |
c125e96f | 438 | * |
074037ec RW |
439 | * Update the @ws' statistics and notify the PM core that the wakeup source has |
440 | * become inactive by decrementing the counter of wakeup events being processed | |
441 | * and incrementing the counter of registered wakeup events. | |
442 | */ | |
443 | static void wakeup_source_deactivate(struct wakeup_source *ws) | |
444 | { | |
445 | ktime_t duration; | |
446 | ktime_t now; | |
447 | ||
448 | ws->relax_count++; | |
449 | /* | |
450 | * __pm_relax() may be called directly or from a timer function. | |
451 | * If it is called directly right after the timer function has been | |
452 | * started, but before the timer function calls __pm_relax(), it is | |
453 | * possible that __pm_stay_awake() will be called in the meantime and | |
454 | * will set ws->active. Then, ws->active may be cleared immediately | |
455 | * by the __pm_relax() called from the timer function, but in such a | |
456 | * case ws->relax_count will be different from ws->active_count. | |
457 | */ | |
458 | if (ws->relax_count != ws->active_count) { | |
459 | ws->relax_count--; | |
460 | return; | |
461 | } | |
462 | ||
463 | ws->active = false; | |
464 | ||
465 | now = ktime_get(); | |
466 | duration = ktime_sub(now, ws->last_time); | |
467 | ws->total_time = ktime_add(ws->total_time, duration); | |
468 | if (ktime_to_ns(duration) > ktime_to_ns(ws->max_time)) | |
469 | ws->max_time = duration; | |
470 | ||
471 | del_timer(&ws->timer); | |
da863cdd | 472 | ws->timer_expires = 0; |
074037ec RW |
473 | |
474 | /* | |
023d3779 RW |
475 | * Increment the counter of registered wakeup events and decrement the |
476 | * couter of wakeup events in progress simultaneously. | |
074037ec | 477 | */ |
023d3779 | 478 | atomic_add(MAX_IN_PROGRESS, &combined_event_count); |
074037ec RW |
479 | } |
480 | ||
481 | /** | |
482 | * __pm_relax - Notify the PM core that processing of a wakeup event has ended. | |
483 | * @ws: Wakeup source object associated with the source of the event. | |
c125e96f RW |
484 | * |
485 | * Call this function for wakeup events whose processing started with calling | |
074037ec | 486 | * __pm_stay_awake(). |
c125e96f RW |
487 | * |
488 | * It is safe to call it from interrupt context. | |
489 | */ | |
074037ec | 490 | void __pm_relax(struct wakeup_source *ws) |
c125e96f RW |
491 | { |
492 | unsigned long flags; | |
493 | ||
074037ec RW |
494 | if (!ws) |
495 | return; | |
496 | ||
497 | spin_lock_irqsave(&ws->lock, flags); | |
498 | if (ws->active) | |
499 | wakeup_source_deactivate(ws); | |
500 | spin_unlock_irqrestore(&ws->lock, flags); | |
501 | } | |
502 | EXPORT_SYMBOL_GPL(__pm_relax); | |
503 | ||
504 | /** | |
505 | * pm_relax - Notify the PM core that processing of a wakeup event has ended. | |
506 | * @dev: Device that signaled the event. | |
507 | * | |
508 | * Execute __pm_relax() for the @dev's wakeup source object. | |
509 | */ | |
510 | void pm_relax(struct device *dev) | |
511 | { | |
512 | unsigned long flags; | |
513 | ||
514 | if (!dev) | |
515 | return; | |
516 | ||
517 | spin_lock_irqsave(&dev->power.lock, flags); | |
518 | __pm_relax(dev->power.wakeup); | |
519 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
c125e96f | 520 | } |
074037ec | 521 | EXPORT_SYMBOL_GPL(pm_relax); |
c125e96f RW |
522 | |
523 | /** | |
4eb241e5 | 524 | * pm_wakeup_timer_fn - Delayed finalization of a wakeup event. |
074037ec | 525 | * @data: Address of the wakeup source object associated with the event source. |
c125e96f | 526 | * |
da863cdd RW |
527 | * Call wakeup_source_deactivate() for the wakeup source whose address is stored |
528 | * in @data if it is currently active and its timer has not been canceled and | |
529 | * the expiration time of the timer is not in future. | |
c125e96f | 530 | */ |
4eb241e5 | 531 | static void pm_wakeup_timer_fn(unsigned long data) |
074037ec | 532 | { |
da863cdd RW |
533 | struct wakeup_source *ws = (struct wakeup_source *)data; |
534 | unsigned long flags; | |
535 | ||
536 | spin_lock_irqsave(&ws->lock, flags); | |
537 | ||
538 | if (ws->active && ws->timer_expires | |
539 | && time_after_eq(jiffies, ws->timer_expires)) | |
540 | wakeup_source_deactivate(ws); | |
541 | ||
542 | spin_unlock_irqrestore(&ws->lock, flags); | |
074037ec RW |
543 | } |
544 | ||
545 | /** | |
546 | * __pm_wakeup_event - Notify the PM core of a wakeup event. | |
547 | * @ws: Wakeup source object associated with the event source. | |
548 | * @msec: Anticipated event processing time (in milliseconds). | |
549 | * | |
550 | * Notify the PM core of a wakeup event whose source is @ws that will take | |
551 | * approximately @msec milliseconds to be processed by the kernel. If @ws is | |
552 | * not active, activate it. If @msec is nonzero, set up the @ws' timer to | |
553 | * execute pm_wakeup_timer_fn() in future. | |
554 | * | |
555 | * It is safe to call this function from interrupt context. | |
556 | */ | |
557 | void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec) | |
c125e96f | 558 | { |
4eb241e5 | 559 | unsigned long flags; |
074037ec | 560 | unsigned long expires; |
c125e96f | 561 | |
074037ec RW |
562 | if (!ws) |
563 | return; | |
564 | ||
565 | spin_lock_irqsave(&ws->lock, flags); | |
566 | ||
567 | ws->event_count++; | |
568 | if (!ws->active) | |
569 | wakeup_source_activate(ws); | |
570 | ||
571 | if (!msec) { | |
572 | wakeup_source_deactivate(ws); | |
573 | goto unlock; | |
4eb241e5 | 574 | } |
074037ec RW |
575 | |
576 | expires = jiffies + msecs_to_jiffies(msec); | |
577 | if (!expires) | |
578 | expires = 1; | |
579 | ||
4782e165 | 580 | if (!ws->timer_expires || time_after(expires, ws->timer_expires)) { |
074037ec RW |
581 | mod_timer(&ws->timer, expires); |
582 | ws->timer_expires = expires; | |
583 | } | |
584 | ||
585 | unlock: | |
586 | spin_unlock_irqrestore(&ws->lock, flags); | |
c125e96f | 587 | } |
074037ec RW |
588 | EXPORT_SYMBOL_GPL(__pm_wakeup_event); |
589 | ||
c125e96f RW |
590 | |
591 | /** | |
592 | * pm_wakeup_event - Notify the PM core of a wakeup event. | |
593 | * @dev: Device the wakeup event is related to. | |
594 | * @msec: Anticipated event processing time (in milliseconds). | |
595 | * | |
074037ec | 596 | * Call __pm_wakeup_event() for the @dev's wakeup source object. |
c125e96f RW |
597 | */ |
598 | void pm_wakeup_event(struct device *dev, unsigned int msec) | |
599 | { | |
600 | unsigned long flags; | |
c125e96f | 601 | |
074037ec RW |
602 | if (!dev) |
603 | return; | |
c125e96f | 604 | |
074037ec RW |
605 | spin_lock_irqsave(&dev->power.lock, flags); |
606 | __pm_wakeup_event(dev->power.wakeup, msec); | |
607 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
608 | } | |
609 | EXPORT_SYMBOL_GPL(pm_wakeup_event); | |
4eb241e5 | 610 | |
074037ec RW |
611 | /** |
612 | * pm_wakeup_update_hit_counts - Update hit counts of all active wakeup sources. | |
613 | */ | |
614 | static void pm_wakeup_update_hit_counts(void) | |
615 | { | |
616 | unsigned long flags; | |
617 | struct wakeup_source *ws; | |
4eb241e5 | 618 | |
074037ec RW |
619 | rcu_read_lock(); |
620 | list_for_each_entry_rcu(ws, &wakeup_sources, entry) { | |
621 | spin_lock_irqsave(&ws->lock, flags); | |
622 | if (ws->active) | |
623 | ws->hit_count++; | |
624 | spin_unlock_irqrestore(&ws->lock, flags); | |
c125e96f | 625 | } |
074037ec | 626 | rcu_read_unlock(); |
c125e96f RW |
627 | } |
628 | ||
629 | /** | |
a2867e08 | 630 | * pm_wakeup_pending - Check if power transition in progress should be aborted. |
c125e96f RW |
631 | * |
632 | * Compare the current number of registered wakeup events with its preserved | |
a2867e08 RW |
633 | * value from the past and return true if new wakeup events have been registered |
634 | * since the old value was stored. Also return true if the current number of | |
635 | * wakeup events being processed is different from zero. | |
c125e96f | 636 | */ |
a2867e08 | 637 | bool pm_wakeup_pending(void) |
c125e96f RW |
638 | { |
639 | unsigned long flags; | |
a2867e08 | 640 | bool ret = false; |
c125e96f RW |
641 | |
642 | spin_lock_irqsave(&events_lock, flags); | |
643 | if (events_check_enabled) { | |
023d3779 RW |
644 | unsigned int cnt, inpr; |
645 | ||
646 | split_counters(&cnt, &inpr); | |
647 | ret = (cnt != saved_count || inpr > 0); | |
a2867e08 | 648 | events_check_enabled = !ret; |
c125e96f RW |
649 | } |
650 | spin_unlock_irqrestore(&events_lock, flags); | |
a2867e08 | 651 | if (ret) |
074037ec | 652 | pm_wakeup_update_hit_counts(); |
c125e96f RW |
653 | return ret; |
654 | } | |
655 | ||
656 | /** | |
657 | * pm_get_wakeup_count - Read the number of registered wakeup events. | |
658 | * @count: Address to store the value at. | |
659 | * | |
660 | * Store the number of registered wakeup events at the address in @count. Block | |
661 | * if the current number of wakeup events being processed is nonzero. | |
662 | * | |
790c7885 | 663 | * Return 'false' if the wait for the number of wakeup events being processed to |
c125e96f | 664 | * drop down to zero has been interrupted by a signal (and the current number |
790c7885 | 665 | * of wakeup events being processed is still nonzero). Otherwise return 'true'. |
c125e96f | 666 | */ |
074037ec | 667 | bool pm_get_wakeup_count(unsigned int *count) |
c125e96f | 668 | { |
023d3779 | 669 | unsigned int cnt, inpr; |
c125e96f | 670 | |
023d3779 RW |
671 | for (;;) { |
672 | split_counters(&cnt, &inpr); | |
673 | if (inpr == 0 || signal_pending(current)) | |
674 | break; | |
074037ec RW |
675 | pm_wakeup_update_hit_counts(); |
676 | schedule_timeout_interruptible(msecs_to_jiffies(TIMEOUT)); | |
c125e96f | 677 | } |
074037ec | 678 | |
023d3779 RW |
679 | split_counters(&cnt, &inpr); |
680 | *count = cnt; | |
681 | return !inpr; | |
c125e96f RW |
682 | } |
683 | ||
684 | /** | |
685 | * pm_save_wakeup_count - Save the current number of registered wakeup events. | |
686 | * @count: Value to compare with the current number of registered wakeup events. | |
687 | * | |
688 | * If @count is equal to the current number of registered wakeup events and the | |
689 | * current number of wakeup events being processed is zero, store @count as the | |
378eef99 RW |
690 | * old number of registered wakeup events for pm_check_wakeup_events(), enable |
691 | * wakeup events detection and return 'true'. Otherwise disable wakeup events | |
692 | * detection and return 'false'. | |
c125e96f | 693 | */ |
074037ec | 694 | bool pm_save_wakeup_count(unsigned int count) |
c125e96f | 695 | { |
023d3779 | 696 | unsigned int cnt, inpr; |
c125e96f | 697 | |
378eef99 | 698 | events_check_enabled = false; |
c125e96f | 699 | spin_lock_irq(&events_lock); |
023d3779 RW |
700 | split_counters(&cnt, &inpr); |
701 | if (cnt == count && inpr == 0) { | |
074037ec | 702 | saved_count = count; |
c125e96f | 703 | events_check_enabled = true; |
c125e96f RW |
704 | } |
705 | spin_unlock_irq(&events_lock); | |
378eef99 | 706 | if (!events_check_enabled) |
074037ec | 707 | pm_wakeup_update_hit_counts(); |
378eef99 | 708 | return events_check_enabled; |
c125e96f | 709 | } |
9c034392 RW |
710 | |
711 | static struct dentry *wakeup_sources_stats_dentry; | |
712 | ||
713 | /** | |
714 | * print_wakeup_source_stats - Print wakeup source statistics information. | |
715 | * @m: seq_file to print the statistics into. | |
716 | * @ws: Wakeup source object to print the statistics for. | |
717 | */ | |
718 | static int print_wakeup_source_stats(struct seq_file *m, | |
719 | struct wakeup_source *ws) | |
720 | { | |
721 | unsigned long flags; | |
722 | ktime_t total_time; | |
723 | ktime_t max_time; | |
724 | unsigned long active_count; | |
725 | ktime_t active_time; | |
726 | int ret; | |
727 | ||
728 | spin_lock_irqsave(&ws->lock, flags); | |
729 | ||
730 | total_time = ws->total_time; | |
731 | max_time = ws->max_time; | |
732 | active_count = ws->active_count; | |
733 | if (ws->active) { | |
734 | active_time = ktime_sub(ktime_get(), ws->last_time); | |
735 | total_time = ktime_add(total_time, active_time); | |
736 | if (active_time.tv64 > max_time.tv64) | |
737 | max_time = active_time; | |
738 | } else { | |
739 | active_time = ktime_set(0, 0); | |
740 | } | |
741 | ||
742 | ret = seq_printf(m, "%-12s\t%lu\t\t%lu\t\t%lu\t\t" | |
743 | "%lld\t\t%lld\t\t%lld\t\t%lld\n", | |
744 | ws->name, active_count, ws->event_count, ws->hit_count, | |
745 | ktime_to_ms(active_time), ktime_to_ms(total_time), | |
746 | ktime_to_ms(max_time), ktime_to_ms(ws->last_time)); | |
747 | ||
748 | spin_unlock_irqrestore(&ws->lock, flags); | |
749 | ||
750 | return ret; | |
751 | } | |
752 | ||
753 | /** | |
754 | * wakeup_sources_stats_show - Print wakeup sources statistics information. | |
755 | * @m: seq_file to print the statistics into. | |
756 | */ | |
757 | static int wakeup_sources_stats_show(struct seq_file *m, void *unused) | |
758 | { | |
759 | struct wakeup_source *ws; | |
760 | ||
761 | seq_puts(m, "name\t\tactive_count\tevent_count\thit_count\t" | |
762 | "active_since\ttotal_time\tmax_time\tlast_change\n"); | |
763 | ||
764 | rcu_read_lock(); | |
765 | list_for_each_entry_rcu(ws, &wakeup_sources, entry) | |
766 | print_wakeup_source_stats(m, ws); | |
767 | rcu_read_unlock(); | |
768 | ||
769 | return 0; | |
770 | } | |
771 | ||
772 | static int wakeup_sources_stats_open(struct inode *inode, struct file *file) | |
773 | { | |
774 | return single_open(file, wakeup_sources_stats_show, NULL); | |
775 | } | |
776 | ||
777 | static const struct file_operations wakeup_sources_stats_fops = { | |
778 | .owner = THIS_MODULE, | |
779 | .open = wakeup_sources_stats_open, | |
780 | .read = seq_read, | |
781 | .llseek = seq_lseek, | |
782 | .release = single_release, | |
783 | }; | |
784 | ||
785 | static int __init wakeup_sources_debugfs_init(void) | |
786 | { | |
787 | wakeup_sources_stats_dentry = debugfs_create_file("wakeup_sources", | |
788 | S_IRUGO, NULL, NULL, &wakeup_sources_stats_fops); | |
789 | return 0; | |
790 | } | |
791 | ||
792 | postcore_initcall(wakeup_sources_debugfs_init); |