Commit | Line | Data |
---|---|---|
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> | |
4990d4fe | 17 | #include <linux/pm_wakeirq.h> |
6791e36c | 18 | #include <trace/events/power.h> |
074037ec RW |
19 | |
20 | #include "power.h" | |
21 | ||
c125e96f RW |
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 | */ | |
30e3ce6d | 26 | bool events_check_enabled __read_mostly; |
c125e96f | 27 | |
068765ba RW |
28 | /* If set and the system is suspending, terminate the suspend. */ |
29 | static bool pm_abort_suspend __read_mostly; | |
30 | ||
023d3779 RW |
31 | /* |
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. | |
35 | */ | |
36 | static atomic_t combined_event_count = ATOMIC_INIT(0); | |
37 | ||
38 | #define IN_PROGRESS_BITS (sizeof(int) * 4) | |
39 | #define MAX_IN_PROGRESS ((1 << IN_PROGRESS_BITS) - 1) | |
40 | ||
41 | static void split_counters(unsigned int *cnt, unsigned int *inpr) | |
42 | { | |
43 | unsigned int comb = atomic_read(&combined_event_count); | |
44 | ||
45 | *cnt = (comb >> IN_PROGRESS_BITS); | |
46 | *inpr = comb & MAX_IN_PROGRESS; | |
47 | } | |
48 | ||
49 | /* A preserved old value of the events counter. */ | |
074037ec | 50 | static unsigned int saved_count; |
c125e96f RW |
51 | |
52 | static DEFINE_SPINLOCK(events_lock); | |
53 | ||
4eb241e5 RW |
54 | static void pm_wakeup_timer_fn(unsigned long data); |
55 | ||
074037ec RW |
56 | static LIST_HEAD(wakeup_sources); |
57 | ||
60af1066 RW |
58 | static DECLARE_WAIT_QUEUE_HEAD(wakeup_count_wait_queue); |
59 | ||
8671bbc1 RW |
60 | /** |
61 | * wakeup_source_prepare - Prepare a new wakeup source for initialization. | |
62 | * @ws: Wakeup source to prepare. | |
63 | * @name: Pointer to the name of the new wakeup source. | |
64 | * | |
65 | * Callers must ensure that the @name string won't be freed when @ws is still in | |
66 | * use. | |
67 | */ | |
68 | void wakeup_source_prepare(struct wakeup_source *ws, const char *name) | |
69 | { | |
70 | if (ws) { | |
71 | memset(ws, 0, sizeof(*ws)); | |
72 | ws->name = name; | |
73 | } | |
74 | } | |
75 | EXPORT_SYMBOL_GPL(wakeup_source_prepare); | |
76 | ||
074037ec RW |
77 | /** |
78 | * wakeup_source_create - Create a struct wakeup_source object. | |
79 | * @name: Name of the new wakeup source. | |
80 | */ | |
81 | struct wakeup_source *wakeup_source_create(const char *name) | |
82 | { | |
83 | struct wakeup_source *ws; | |
84 | ||
8671bbc1 | 85 | ws = kmalloc(sizeof(*ws), GFP_KERNEL); |
074037ec RW |
86 | if (!ws) |
87 | return NULL; | |
88 | ||
8671bbc1 | 89 | wakeup_source_prepare(ws, name ? kstrdup(name, GFP_KERNEL) : NULL); |
074037ec RW |
90 | return ws; |
91 | } | |
92 | EXPORT_SYMBOL_GPL(wakeup_source_create); | |
93 | ||
94 | /** | |
8671bbc1 RW |
95 | * wakeup_source_drop - Prepare a struct wakeup_source object for destruction. |
96 | * @ws: Wakeup source to prepare for destruction. | |
d94aff87 RW |
97 | * |
98 | * Callers must ensure that __pm_stay_awake() or __pm_wakeup_event() will never | |
99 | * be run in parallel with this function for the same wakeup source object. | |
074037ec | 100 | */ |
8671bbc1 | 101 | void wakeup_source_drop(struct wakeup_source *ws) |
074037ec RW |
102 | { |
103 | if (!ws) | |
104 | return; | |
105 | ||
d94aff87 RW |
106 | del_timer_sync(&ws->timer); |
107 | __pm_relax(ws); | |
8671bbc1 RW |
108 | } |
109 | EXPORT_SYMBOL_GPL(wakeup_source_drop); | |
110 | ||
111 | /** | |
112 | * wakeup_source_destroy - Destroy a struct wakeup_source object. | |
113 | * @ws: Wakeup source to destroy. | |
114 | * | |
115 | * Use only for wakeup source objects created with wakeup_source_create(). | |
116 | */ | |
117 | void wakeup_source_destroy(struct wakeup_source *ws) | |
118 | { | |
119 | if (!ws) | |
120 | return; | |
121 | ||
122 | wakeup_source_drop(ws); | |
074037ec RW |
123 | kfree(ws->name); |
124 | kfree(ws); | |
125 | } | |
126 | EXPORT_SYMBOL_GPL(wakeup_source_destroy); | |
127 | ||
128 | /** | |
129 | * wakeup_source_add - Add given object to the list of wakeup sources. | |
130 | * @ws: Wakeup source object to add to the list. | |
131 | */ | |
132 | void wakeup_source_add(struct wakeup_source *ws) | |
133 | { | |
49550709 JS |
134 | unsigned long flags; |
135 | ||
074037ec RW |
136 | if (WARN_ON(!ws)) |
137 | return; | |
138 | ||
7c95149b | 139 | spin_lock_init(&ws->lock); |
074037ec RW |
140 | setup_timer(&ws->timer, pm_wakeup_timer_fn, (unsigned long)ws); |
141 | ws->active = false; | |
b86ff982 | 142 | ws->last_time = ktime_get(); |
074037ec | 143 | |
49550709 | 144 | spin_lock_irqsave(&events_lock, flags); |
074037ec | 145 | list_add_rcu(&ws->entry, &wakeup_sources); |
49550709 | 146 | spin_unlock_irqrestore(&events_lock, flags); |
074037ec RW |
147 | } |
148 | EXPORT_SYMBOL_GPL(wakeup_source_add); | |
149 | ||
150 | /** | |
151 | * wakeup_source_remove - Remove given object from the wakeup sources list. | |
152 | * @ws: Wakeup source object to remove from the list. | |
153 | */ | |
154 | void wakeup_source_remove(struct wakeup_source *ws) | |
155 | { | |
49550709 JS |
156 | unsigned long flags; |
157 | ||
074037ec RW |
158 | if (WARN_ON(!ws)) |
159 | return; | |
160 | ||
49550709 | 161 | spin_lock_irqsave(&events_lock, flags); |
074037ec | 162 | list_del_rcu(&ws->entry); |
49550709 | 163 | spin_unlock_irqrestore(&events_lock, flags); |
074037ec RW |
164 | synchronize_rcu(); |
165 | } | |
166 | EXPORT_SYMBOL_GPL(wakeup_source_remove); | |
167 | ||
168 | /** | |
169 | * wakeup_source_register - Create wakeup source and add it to the list. | |
170 | * @name: Name of the wakeup source to register. | |
171 | */ | |
172 | struct wakeup_source *wakeup_source_register(const char *name) | |
173 | { | |
174 | struct wakeup_source *ws; | |
175 | ||
176 | ws = wakeup_source_create(name); | |
177 | if (ws) | |
178 | wakeup_source_add(ws); | |
179 | ||
180 | return ws; | |
181 | } | |
182 | EXPORT_SYMBOL_GPL(wakeup_source_register); | |
183 | ||
184 | /** | |
185 | * wakeup_source_unregister - Remove wakeup source from the list and remove it. | |
186 | * @ws: Wakeup source object to unregister. | |
187 | */ | |
188 | void wakeup_source_unregister(struct wakeup_source *ws) | |
189 | { | |
8671bbc1 RW |
190 | if (ws) { |
191 | wakeup_source_remove(ws); | |
192 | wakeup_source_destroy(ws); | |
193 | } | |
074037ec RW |
194 | } |
195 | EXPORT_SYMBOL_GPL(wakeup_source_unregister); | |
196 | ||
197 | /** | |
198 | * device_wakeup_attach - Attach a wakeup source object to a device object. | |
199 | * @dev: Device to handle. | |
200 | * @ws: Wakeup source object to attach to @dev. | |
201 | * | |
202 | * This causes @dev to be treated as a wakeup device. | |
203 | */ | |
204 | static int device_wakeup_attach(struct device *dev, struct wakeup_source *ws) | |
205 | { | |
206 | spin_lock_irq(&dev->power.lock); | |
207 | if (dev->power.wakeup) { | |
208 | spin_unlock_irq(&dev->power.lock); | |
209 | return -EEXIST; | |
210 | } | |
211 | dev->power.wakeup = ws; | |
212 | spin_unlock_irq(&dev->power.lock); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | /** | |
217 | * device_wakeup_enable - Enable given device to be a wakeup source. | |
218 | * @dev: Device to handle. | |
219 | * | |
220 | * Create a wakeup source object, register it and attach it to @dev. | |
221 | */ | |
222 | int device_wakeup_enable(struct device *dev) | |
223 | { | |
224 | struct wakeup_source *ws; | |
225 | int ret; | |
226 | ||
227 | if (!dev || !dev->power.can_wakeup) | |
228 | return -EINVAL; | |
229 | ||
230 | ws = wakeup_source_register(dev_name(dev)); | |
231 | if (!ws) | |
232 | return -ENOMEM; | |
233 | ||
234 | ret = device_wakeup_attach(dev, ws); | |
235 | if (ret) | |
236 | wakeup_source_unregister(ws); | |
237 | ||
238 | return ret; | |
239 | } | |
240 | EXPORT_SYMBOL_GPL(device_wakeup_enable); | |
241 | ||
4990d4fe TL |
242 | /** |
243 | * device_wakeup_attach_irq - Attach a wakeirq to a wakeup source | |
244 | * @dev: Device to handle | |
245 | * @wakeirq: Device specific wakeirq entry | |
246 | * | |
247 | * Attach a device wakeirq to the wakeup source so the device | |
248 | * wake IRQ can be configured automatically for suspend and | |
249 | * resume. | |
250 | */ | |
251 | int device_wakeup_attach_irq(struct device *dev, | |
252 | struct wake_irq *wakeirq) | |
253 | { | |
254 | struct wakeup_source *ws; | |
255 | int ret = 0; | |
256 | ||
257 | spin_lock_irq(&dev->power.lock); | |
258 | ws = dev->power.wakeup; | |
259 | if (!ws) { | |
260 | dev_err(dev, "forgot to call call device_init_wakeup?\n"); | |
261 | ret = -EINVAL; | |
262 | goto unlock; | |
263 | } | |
264 | ||
265 | if (ws->wakeirq) { | |
266 | ret = -EEXIST; | |
267 | goto unlock; | |
268 | } | |
269 | ||
270 | ws->wakeirq = wakeirq; | |
271 | ||
272 | unlock: | |
273 | spin_unlock_irq(&dev->power.lock); | |
274 | ||
275 | return ret; | |
276 | } | |
277 | ||
278 | /** | |
279 | * device_wakeup_detach_irq - Detach a wakeirq from a wakeup source | |
280 | * @dev: Device to handle | |
281 | * | |
282 | * Removes a device wakeirq from the wakeup source. | |
283 | */ | |
284 | void device_wakeup_detach_irq(struct device *dev) | |
285 | { | |
286 | struct wakeup_source *ws; | |
287 | ||
288 | spin_lock_irq(&dev->power.lock); | |
289 | ws = dev->power.wakeup; | |
290 | if (!ws) | |
291 | goto unlock; | |
292 | ||
293 | ws->wakeirq = NULL; | |
294 | ||
295 | unlock: | |
296 | spin_unlock_irq(&dev->power.lock); | |
297 | } | |
298 | ||
299 | /** | |
300 | * device_wakeup_arm_wake_irqs(void) | |
301 | * | |
302 | * Itereates over the list of device wakeirqs to arm them. | |
303 | */ | |
304 | void device_wakeup_arm_wake_irqs(void) | |
305 | { | |
306 | struct wakeup_source *ws; | |
307 | ||
308 | rcu_read_lock(); | |
309 | list_for_each_entry_rcu(ws, &wakeup_sources, entry) { | |
310 | if (ws->wakeirq) | |
311 | dev_pm_arm_wake_irq(ws->wakeirq); | |
312 | } | |
313 | rcu_read_unlock(); | |
314 | } | |
315 | ||
316 | /** | |
317 | * device_wakeup_disarm_wake_irqs(void) | |
318 | * | |
319 | * Itereates over the list of device wakeirqs to disarm them. | |
320 | */ | |
321 | void device_wakeup_disarm_wake_irqs(void) | |
322 | { | |
323 | struct wakeup_source *ws; | |
324 | ||
325 | rcu_read_lock(); | |
326 | list_for_each_entry_rcu(ws, &wakeup_sources, entry) { | |
327 | if (ws->wakeirq) | |
328 | dev_pm_disarm_wake_irq(ws->wakeirq); | |
329 | } | |
330 | rcu_read_unlock(); | |
331 | } | |
332 | ||
074037ec RW |
333 | /** |
334 | * device_wakeup_detach - Detach a device's wakeup source object from it. | |
335 | * @dev: Device to detach the wakeup source object from. | |
336 | * | |
337 | * After it returns, @dev will not be treated as a wakeup device any more. | |
338 | */ | |
339 | static struct wakeup_source *device_wakeup_detach(struct device *dev) | |
340 | { | |
341 | struct wakeup_source *ws; | |
342 | ||
343 | spin_lock_irq(&dev->power.lock); | |
344 | ws = dev->power.wakeup; | |
345 | dev->power.wakeup = NULL; | |
346 | spin_unlock_irq(&dev->power.lock); | |
347 | return ws; | |
348 | } | |
349 | ||
350 | /** | |
351 | * device_wakeup_disable - Do not regard a device as a wakeup source any more. | |
352 | * @dev: Device to handle. | |
353 | * | |
354 | * Detach the @dev's wakeup source object from it, unregister this wakeup source | |
355 | * object and destroy it. | |
356 | */ | |
357 | int device_wakeup_disable(struct device *dev) | |
358 | { | |
359 | struct wakeup_source *ws; | |
360 | ||
361 | if (!dev || !dev->power.can_wakeup) | |
362 | return -EINVAL; | |
363 | ||
364 | ws = device_wakeup_detach(dev); | |
365 | if (ws) | |
366 | wakeup_source_unregister(ws); | |
367 | ||
368 | return 0; | |
369 | } | |
370 | EXPORT_SYMBOL_GPL(device_wakeup_disable); | |
371 | ||
cb8f51bd RW |
372 | /** |
373 | * device_set_wakeup_capable - Set/reset device wakeup capability flag. | |
374 | * @dev: Device to handle. | |
375 | * @capable: Whether or not @dev is capable of waking up the system from sleep. | |
376 | * | |
377 | * If @capable is set, set the @dev's power.can_wakeup flag and add its | |
378 | * wakeup-related attributes to sysfs. Otherwise, unset the @dev's | |
379 | * power.can_wakeup flag and remove its wakeup-related attributes from sysfs. | |
380 | * | |
381 | * This function may sleep and it can't be called from any context where | |
382 | * sleeping is not allowed. | |
383 | */ | |
384 | void device_set_wakeup_capable(struct device *dev, bool capable) | |
385 | { | |
386 | if (!!dev->power.can_wakeup == !!capable) | |
387 | return; | |
388 | ||
22110faf | 389 | if (device_is_registered(dev) && !list_empty(&dev->power.entry)) { |
cb8f51bd RW |
390 | if (capable) { |
391 | if (wakeup_sysfs_add(dev)) | |
392 | return; | |
393 | } else { | |
394 | wakeup_sysfs_remove(dev); | |
395 | } | |
396 | } | |
397 | dev->power.can_wakeup = capable; | |
398 | } | |
399 | EXPORT_SYMBOL_GPL(device_set_wakeup_capable); | |
400 | ||
074037ec RW |
401 | /** |
402 | * device_init_wakeup - Device wakeup initialization. | |
403 | * @dev: Device to handle. | |
404 | * @enable: Whether or not to enable @dev as a wakeup device. | |
405 | * | |
406 | * By default, most devices should leave wakeup disabled. The exceptions are | |
407 | * devices that everyone expects to be wakeup sources: keyboards, power buttons, | |
8f88893c AS |
408 | * possibly network interfaces, etc. Also, devices that don't generate their |
409 | * own wakeup requests but merely forward requests from one bus to another | |
410 | * (like PCI bridges) should have wakeup enabled by default. | |
074037ec RW |
411 | */ |
412 | int device_init_wakeup(struct device *dev, bool enable) | |
413 | { | |
414 | int ret = 0; | |
415 | ||
0c5ff0ef ZR |
416 | if (!dev) |
417 | return -EINVAL; | |
418 | ||
074037ec RW |
419 | if (enable) { |
420 | device_set_wakeup_capable(dev, true); | |
421 | ret = device_wakeup_enable(dev); | |
422 | } else { | |
0c5ff0ef ZR |
423 | if (dev->power.can_wakeup) |
424 | device_wakeup_disable(dev); | |
425 | ||
074037ec RW |
426 | device_set_wakeup_capable(dev, false); |
427 | } | |
428 | ||
429 | return ret; | |
430 | } | |
431 | EXPORT_SYMBOL_GPL(device_init_wakeup); | |
432 | ||
433 | /** | |
434 | * device_set_wakeup_enable - Enable or disable a device to wake up the system. | |
435 | * @dev: Device to handle. | |
436 | */ | |
437 | int device_set_wakeup_enable(struct device *dev, bool enable) | |
438 | { | |
439 | if (!dev || !dev->power.can_wakeup) | |
440 | return -EINVAL; | |
441 | ||
442 | return enable ? device_wakeup_enable(dev) : device_wakeup_disable(dev); | |
443 | } | |
444 | EXPORT_SYMBOL_GPL(device_set_wakeup_enable); | |
4eb241e5 | 445 | |
c125e96f RW |
446 | /* |
447 | * The functions below use the observation that each wakeup event starts a | |
448 | * period in which the system should not be suspended. The moment this period | |
449 | * will end depends on how the wakeup event is going to be processed after being | |
450 | * detected and all of the possible cases can be divided into two distinct | |
451 | * groups. | |
452 | * | |
453 | * First, a wakeup event may be detected by the same functional unit that will | |
454 | * carry out the entire processing of it and possibly will pass it to user space | |
455 | * for further processing. In that case the functional unit that has detected | |
456 | * the event may later "close" the "no suspend" period associated with it | |
457 | * directly as soon as it has been dealt with. The pair of pm_stay_awake() and | |
458 | * pm_relax(), balanced with each other, is supposed to be used in such | |
459 | * situations. | |
460 | * | |
461 | * Second, a wakeup event may be detected by one functional unit and processed | |
462 | * by another one. In that case the unit that has detected it cannot really | |
463 | * "close" the "no suspend" period associated with it, unless it knows in | |
464 | * advance what's going to happen to the event during processing. This | |
465 | * knowledge, however, may not be available to it, so it can simply specify time | |
466 | * to wait before the system can be suspended and pass it as the second | |
467 | * argument of pm_wakeup_event(). | |
074037ec RW |
468 | * |
469 | * It is valid to call pm_relax() after pm_wakeup_event(), in which case the | |
470 | * "no suspend" period will be ended either by the pm_relax(), or by the timer | |
471 | * function executed when the timer expires, whichever comes first. | |
c125e96f RW |
472 | */ |
473 | ||
074037ec RW |
474 | /** |
475 | * wakup_source_activate - Mark given wakeup source as active. | |
476 | * @ws: Wakeup source to handle. | |
477 | * | |
478 | * Update the @ws' statistics and, if @ws has just been activated, notify the PM | |
479 | * core of the event by incrementing the counter of of wakeup events being | |
480 | * processed. | |
481 | */ | |
482 | static void wakeup_source_activate(struct wakeup_source *ws) | |
483 | { | |
6791e36c AH |
484 | unsigned int cec; |
485 | ||
7e73c5ae ZR |
486 | /* |
487 | * active wakeup source should bring the system | |
488 | * out of PM_SUSPEND_FREEZE state | |
489 | */ | |
490 | freeze_wake(); | |
491 | ||
074037ec RW |
492 | ws->active = true; |
493 | ws->active_count++; | |
074037ec | 494 | ws->last_time = ktime_get(); |
55850945 RW |
495 | if (ws->autosleep_enabled) |
496 | ws->start_prevent_time = ws->last_time; | |
074037ec | 497 | |
023d3779 | 498 | /* Increment the counter of events in progress. */ |
6791e36c AH |
499 | cec = atomic_inc_return(&combined_event_count); |
500 | ||
501 | trace_wakeup_source_activate(ws->name, cec); | |
074037ec RW |
502 | } |
503 | ||
30e3ce6d RW |
504 | /** |
505 | * wakeup_source_report_event - Report wakeup event using the given source. | |
506 | * @ws: Wakeup source to report the event for. | |
507 | */ | |
508 | static void wakeup_source_report_event(struct wakeup_source *ws) | |
509 | { | |
510 | ws->event_count++; | |
511 | /* This is racy, but the counter is approximate anyway. */ | |
512 | if (events_check_enabled) | |
513 | ws->wakeup_count++; | |
514 | ||
515 | if (!ws->active) | |
516 | wakeup_source_activate(ws); | |
517 | } | |
518 | ||
074037ec RW |
519 | /** |
520 | * __pm_stay_awake - Notify the PM core of a wakeup event. | |
521 | * @ws: Wakeup source object associated with the source of the event. | |
522 | * | |
523 | * It is safe to call this function from interrupt context. | |
524 | */ | |
525 | void __pm_stay_awake(struct wakeup_source *ws) | |
526 | { | |
527 | unsigned long flags; | |
528 | ||
529 | if (!ws) | |
530 | return; | |
531 | ||
532 | spin_lock_irqsave(&ws->lock, flags); | |
4782e165 | 533 | |
30e3ce6d | 534 | wakeup_source_report_event(ws); |
4782e165 RW |
535 | del_timer(&ws->timer); |
536 | ws->timer_expires = 0; | |
537 | ||
074037ec RW |
538 | spin_unlock_irqrestore(&ws->lock, flags); |
539 | } | |
540 | EXPORT_SYMBOL_GPL(__pm_stay_awake); | |
541 | ||
c125e96f RW |
542 | /** |
543 | * pm_stay_awake - Notify the PM core that a wakeup event is being processed. | |
544 | * @dev: Device the wakeup event is related to. | |
545 | * | |
074037ec RW |
546 | * Notify the PM core of a wakeup event (signaled by @dev) by calling |
547 | * __pm_stay_awake for the @dev's wakeup source object. | |
c125e96f RW |
548 | * |
549 | * Call this function after detecting of a wakeup event if pm_relax() is going | |
550 | * to be called directly after processing the event (and possibly passing it to | |
551 | * user space for further processing). | |
c125e96f RW |
552 | */ |
553 | void pm_stay_awake(struct device *dev) | |
554 | { | |
555 | unsigned long flags; | |
556 | ||
074037ec RW |
557 | if (!dev) |
558 | return; | |
c125e96f | 559 | |
074037ec RW |
560 | spin_lock_irqsave(&dev->power.lock, flags); |
561 | __pm_stay_awake(dev->power.wakeup); | |
562 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
c125e96f | 563 | } |
074037ec | 564 | EXPORT_SYMBOL_GPL(pm_stay_awake); |
c125e96f | 565 | |
55850945 RW |
566 | #ifdef CONFIG_PM_AUTOSLEEP |
567 | static void update_prevent_sleep_time(struct wakeup_source *ws, ktime_t now) | |
568 | { | |
569 | ktime_t delta = ktime_sub(now, ws->start_prevent_time); | |
570 | ws->prevent_sleep_time = ktime_add(ws->prevent_sleep_time, delta); | |
571 | } | |
572 | #else | |
573 | static inline void update_prevent_sleep_time(struct wakeup_source *ws, | |
574 | ktime_t now) {} | |
575 | #endif | |
576 | ||
c125e96f | 577 | /** |
074037ec RW |
578 | * wakup_source_deactivate - Mark given wakeup source as inactive. |
579 | * @ws: Wakeup source to handle. | |
c125e96f | 580 | * |
074037ec RW |
581 | * Update the @ws' statistics and notify the PM core that the wakeup source has |
582 | * become inactive by decrementing the counter of wakeup events being processed | |
583 | * and incrementing the counter of registered wakeup events. | |
584 | */ | |
585 | static void wakeup_source_deactivate(struct wakeup_source *ws) | |
586 | { | |
6791e36c | 587 | unsigned int cnt, inpr, cec; |
074037ec RW |
588 | ktime_t duration; |
589 | ktime_t now; | |
590 | ||
591 | ws->relax_count++; | |
592 | /* | |
593 | * __pm_relax() may be called directly or from a timer function. | |
594 | * If it is called directly right after the timer function has been | |
595 | * started, but before the timer function calls __pm_relax(), it is | |
596 | * possible that __pm_stay_awake() will be called in the meantime and | |
597 | * will set ws->active. Then, ws->active may be cleared immediately | |
598 | * by the __pm_relax() called from the timer function, but in such a | |
599 | * case ws->relax_count will be different from ws->active_count. | |
600 | */ | |
601 | if (ws->relax_count != ws->active_count) { | |
602 | ws->relax_count--; | |
603 | return; | |
604 | } | |
605 | ||
606 | ws->active = false; | |
607 | ||
608 | now = ktime_get(); | |
609 | duration = ktime_sub(now, ws->last_time); | |
610 | ws->total_time = ktime_add(ws->total_time, duration); | |
611 | if (ktime_to_ns(duration) > ktime_to_ns(ws->max_time)) | |
612 | ws->max_time = duration; | |
613 | ||
30e3ce6d | 614 | ws->last_time = now; |
074037ec | 615 | del_timer(&ws->timer); |
da863cdd | 616 | ws->timer_expires = 0; |
074037ec | 617 | |
55850945 RW |
618 | if (ws->autosleep_enabled) |
619 | update_prevent_sleep_time(ws, now); | |
620 | ||
074037ec | 621 | /* |
023d3779 RW |
622 | * Increment the counter of registered wakeup events and decrement the |
623 | * couter of wakeup events in progress simultaneously. | |
074037ec | 624 | */ |
6791e36c AH |
625 | cec = atomic_add_return(MAX_IN_PROGRESS, &combined_event_count); |
626 | trace_wakeup_source_deactivate(ws->name, cec); | |
60af1066 RW |
627 | |
628 | split_counters(&cnt, &inpr); | |
629 | if (!inpr && waitqueue_active(&wakeup_count_wait_queue)) | |
630 | wake_up(&wakeup_count_wait_queue); | |
074037ec RW |
631 | } |
632 | ||
633 | /** | |
634 | * __pm_relax - Notify the PM core that processing of a wakeup event has ended. | |
635 | * @ws: Wakeup source object associated with the source of the event. | |
c125e96f RW |
636 | * |
637 | * Call this function for wakeup events whose processing started with calling | |
074037ec | 638 | * __pm_stay_awake(). |
c125e96f RW |
639 | * |
640 | * It is safe to call it from interrupt context. | |
641 | */ | |
074037ec | 642 | void __pm_relax(struct wakeup_source *ws) |
c125e96f RW |
643 | { |
644 | unsigned long flags; | |
645 | ||
074037ec RW |
646 | if (!ws) |
647 | return; | |
648 | ||
649 | spin_lock_irqsave(&ws->lock, flags); | |
650 | if (ws->active) | |
651 | wakeup_source_deactivate(ws); | |
652 | spin_unlock_irqrestore(&ws->lock, flags); | |
653 | } | |
654 | EXPORT_SYMBOL_GPL(__pm_relax); | |
655 | ||
656 | /** | |
657 | * pm_relax - Notify the PM core that processing of a wakeup event has ended. | |
658 | * @dev: Device that signaled the event. | |
659 | * | |
660 | * Execute __pm_relax() for the @dev's wakeup source object. | |
661 | */ | |
662 | void pm_relax(struct device *dev) | |
663 | { | |
664 | unsigned long flags; | |
665 | ||
666 | if (!dev) | |
667 | return; | |
668 | ||
669 | spin_lock_irqsave(&dev->power.lock, flags); | |
670 | __pm_relax(dev->power.wakeup); | |
671 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
c125e96f | 672 | } |
074037ec | 673 | EXPORT_SYMBOL_GPL(pm_relax); |
c125e96f RW |
674 | |
675 | /** | |
4eb241e5 | 676 | * pm_wakeup_timer_fn - Delayed finalization of a wakeup event. |
074037ec | 677 | * @data: Address of the wakeup source object associated with the event source. |
c125e96f | 678 | * |
da863cdd RW |
679 | * Call wakeup_source_deactivate() for the wakeup source whose address is stored |
680 | * in @data if it is currently active and its timer has not been canceled and | |
681 | * the expiration time of the timer is not in future. | |
c125e96f | 682 | */ |
4eb241e5 | 683 | static void pm_wakeup_timer_fn(unsigned long data) |
074037ec | 684 | { |
da863cdd RW |
685 | struct wakeup_source *ws = (struct wakeup_source *)data; |
686 | unsigned long flags; | |
687 | ||
688 | spin_lock_irqsave(&ws->lock, flags); | |
689 | ||
690 | if (ws->active && ws->timer_expires | |
30e3ce6d | 691 | && time_after_eq(jiffies, ws->timer_expires)) { |
da863cdd | 692 | wakeup_source_deactivate(ws); |
30e3ce6d RW |
693 | ws->expire_count++; |
694 | } | |
da863cdd RW |
695 | |
696 | spin_unlock_irqrestore(&ws->lock, flags); | |
074037ec RW |
697 | } |
698 | ||
699 | /** | |
700 | * __pm_wakeup_event - Notify the PM core of a wakeup event. | |
701 | * @ws: Wakeup source object associated with the event source. | |
702 | * @msec: Anticipated event processing time (in milliseconds). | |
703 | * | |
704 | * Notify the PM core of a wakeup event whose source is @ws that will take | |
705 | * approximately @msec milliseconds to be processed by the kernel. If @ws is | |
706 | * not active, activate it. If @msec is nonzero, set up the @ws' timer to | |
707 | * execute pm_wakeup_timer_fn() in future. | |
708 | * | |
709 | * It is safe to call this function from interrupt context. | |
710 | */ | |
711 | void __pm_wakeup_event(struct wakeup_source *ws, unsigned int msec) | |
c125e96f | 712 | { |
4eb241e5 | 713 | unsigned long flags; |
074037ec | 714 | unsigned long expires; |
c125e96f | 715 | |
074037ec RW |
716 | if (!ws) |
717 | return; | |
718 | ||
719 | spin_lock_irqsave(&ws->lock, flags); | |
720 | ||
30e3ce6d | 721 | wakeup_source_report_event(ws); |
074037ec RW |
722 | |
723 | if (!msec) { | |
724 | wakeup_source_deactivate(ws); | |
725 | goto unlock; | |
4eb241e5 | 726 | } |
074037ec RW |
727 | |
728 | expires = jiffies + msecs_to_jiffies(msec); | |
729 | if (!expires) | |
730 | expires = 1; | |
731 | ||
4782e165 | 732 | if (!ws->timer_expires || time_after(expires, ws->timer_expires)) { |
074037ec RW |
733 | mod_timer(&ws->timer, expires); |
734 | ws->timer_expires = expires; | |
735 | } | |
736 | ||
737 | unlock: | |
738 | spin_unlock_irqrestore(&ws->lock, flags); | |
c125e96f | 739 | } |
074037ec RW |
740 | EXPORT_SYMBOL_GPL(__pm_wakeup_event); |
741 | ||
c125e96f RW |
742 | |
743 | /** | |
744 | * pm_wakeup_event - Notify the PM core of a wakeup event. | |
745 | * @dev: Device the wakeup event is related to. | |
746 | * @msec: Anticipated event processing time (in milliseconds). | |
747 | * | |
074037ec | 748 | * Call __pm_wakeup_event() for the @dev's wakeup source object. |
c125e96f RW |
749 | */ |
750 | void pm_wakeup_event(struct device *dev, unsigned int msec) | |
751 | { | |
752 | unsigned long flags; | |
c125e96f | 753 | |
074037ec RW |
754 | if (!dev) |
755 | return; | |
c125e96f | 756 | |
074037ec RW |
757 | spin_lock_irqsave(&dev->power.lock, flags); |
758 | __pm_wakeup_event(dev->power.wakeup, msec); | |
759 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
760 | } | |
761 | EXPORT_SYMBOL_GPL(pm_wakeup_event); | |
4eb241e5 | 762 | |
bb177fed | 763 | void pm_print_active_wakeup_sources(void) |
a938da06 TP |
764 | { |
765 | struct wakeup_source *ws; | |
766 | int active = 0; | |
767 | struct wakeup_source *last_activity_ws = NULL; | |
768 | ||
769 | rcu_read_lock(); | |
770 | list_for_each_entry_rcu(ws, &wakeup_sources, entry) { | |
771 | if (ws->active) { | |
772 | pr_info("active wakeup source: %s\n", ws->name); | |
773 | active = 1; | |
774 | } else if (!active && | |
775 | (!last_activity_ws || | |
776 | ktime_to_ns(ws->last_time) > | |
777 | ktime_to_ns(last_activity_ws->last_time))) { | |
778 | last_activity_ws = ws; | |
779 | } | |
780 | } | |
781 | ||
782 | if (!active && last_activity_ws) | |
783 | pr_info("last active wakeup source: %s\n", | |
784 | last_activity_ws->name); | |
785 | rcu_read_unlock(); | |
786 | } | |
bb177fed | 787 | EXPORT_SYMBOL_GPL(pm_print_active_wakeup_sources); |
a938da06 | 788 | |
c125e96f | 789 | /** |
a2867e08 | 790 | * pm_wakeup_pending - Check if power transition in progress should be aborted. |
c125e96f RW |
791 | * |
792 | * Compare the current number of registered wakeup events with its preserved | |
a2867e08 RW |
793 | * value from the past and return true if new wakeup events have been registered |
794 | * since the old value was stored. Also return true if the current number of | |
795 | * wakeup events being processed is different from zero. | |
c125e96f | 796 | */ |
a2867e08 | 797 | bool pm_wakeup_pending(void) |
c125e96f RW |
798 | { |
799 | unsigned long flags; | |
a2867e08 | 800 | bool ret = false; |
c125e96f RW |
801 | |
802 | spin_lock_irqsave(&events_lock, flags); | |
803 | if (events_check_enabled) { | |
023d3779 RW |
804 | unsigned int cnt, inpr; |
805 | ||
806 | split_counters(&cnt, &inpr); | |
807 | ret = (cnt != saved_count || inpr > 0); | |
a2867e08 | 808 | events_check_enabled = !ret; |
c125e96f RW |
809 | } |
810 | spin_unlock_irqrestore(&events_lock, flags); | |
a938da06 | 811 | |
9350de06 BT |
812 | if (ret) { |
813 | pr_info("PM: Wakeup pending, aborting suspend\n"); | |
bb177fed | 814 | pm_print_active_wakeup_sources(); |
9350de06 | 815 | } |
a938da06 | 816 | |
068765ba RW |
817 | return ret || pm_abort_suspend; |
818 | } | |
819 | ||
820 | void pm_system_wakeup(void) | |
821 | { | |
822 | pm_abort_suspend = true; | |
823 | freeze_wake(); | |
824 | } | |
432ec92b | 825 | EXPORT_SYMBOL_GPL(pm_system_wakeup); |
068765ba RW |
826 | |
827 | void pm_wakeup_clear(void) | |
828 | { | |
829 | pm_abort_suspend = false; | |
c125e96f RW |
830 | } |
831 | ||
832 | /** | |
833 | * pm_get_wakeup_count - Read the number of registered wakeup events. | |
834 | * @count: Address to store the value at. | |
7483b4a4 | 835 | * @block: Whether or not to block. |
c125e96f | 836 | * |
7483b4a4 RW |
837 | * Store the number of registered wakeup events at the address in @count. If |
838 | * @block is set, block until the current number of wakeup events being | |
839 | * processed is zero. | |
c125e96f | 840 | * |
7483b4a4 RW |
841 | * Return 'false' if the current number of wakeup events being processed is |
842 | * nonzero. Otherwise return 'true'. | |
c125e96f | 843 | */ |
7483b4a4 | 844 | bool pm_get_wakeup_count(unsigned int *count, bool block) |
c125e96f | 845 | { |
023d3779 | 846 | unsigned int cnt, inpr; |
c125e96f | 847 | |
7483b4a4 RW |
848 | if (block) { |
849 | DEFINE_WAIT(wait); | |
850 | ||
851 | for (;;) { | |
852 | prepare_to_wait(&wakeup_count_wait_queue, &wait, | |
853 | TASK_INTERRUPTIBLE); | |
854 | split_counters(&cnt, &inpr); | |
855 | if (inpr == 0 || signal_pending(current)) | |
856 | break; | |
60af1066 | 857 | |
7483b4a4 RW |
858 | schedule(); |
859 | } | |
860 | finish_wait(&wakeup_count_wait_queue, &wait); | |
c125e96f | 861 | } |
074037ec | 862 | |
023d3779 RW |
863 | split_counters(&cnt, &inpr); |
864 | *count = cnt; | |
865 | return !inpr; | |
c125e96f RW |
866 | } |
867 | ||
868 | /** | |
869 | * pm_save_wakeup_count - Save the current number of registered wakeup events. | |
870 | * @count: Value to compare with the current number of registered wakeup events. | |
871 | * | |
872 | * If @count is equal to the current number of registered wakeup events and the | |
873 | * current number of wakeup events being processed is zero, store @count as the | |
378eef99 RW |
874 | * old number of registered wakeup events for pm_check_wakeup_events(), enable |
875 | * wakeup events detection and return 'true'. Otherwise disable wakeup events | |
876 | * detection and return 'false'. | |
c125e96f | 877 | */ |
074037ec | 878 | bool pm_save_wakeup_count(unsigned int count) |
c125e96f | 879 | { |
023d3779 | 880 | unsigned int cnt, inpr; |
49550709 | 881 | unsigned long flags; |
c125e96f | 882 | |
378eef99 | 883 | events_check_enabled = false; |
49550709 | 884 | spin_lock_irqsave(&events_lock, flags); |
023d3779 RW |
885 | split_counters(&cnt, &inpr); |
886 | if (cnt == count && inpr == 0) { | |
074037ec | 887 | saved_count = count; |
c125e96f | 888 | events_check_enabled = true; |
c125e96f | 889 | } |
49550709 | 890 | spin_unlock_irqrestore(&events_lock, flags); |
378eef99 | 891 | return events_check_enabled; |
c125e96f | 892 | } |
9c034392 | 893 | |
55850945 RW |
894 | #ifdef CONFIG_PM_AUTOSLEEP |
895 | /** | |
896 | * pm_wakep_autosleep_enabled - Modify autosleep_enabled for all wakeup sources. | |
897 | * @enabled: Whether to set or to clear the autosleep_enabled flags. | |
898 | */ | |
899 | void pm_wakep_autosleep_enabled(bool set) | |
900 | { | |
901 | struct wakeup_source *ws; | |
902 | ktime_t now = ktime_get(); | |
903 | ||
904 | rcu_read_lock(); | |
905 | list_for_each_entry_rcu(ws, &wakeup_sources, entry) { | |
906 | spin_lock_irq(&ws->lock); | |
907 | if (ws->autosleep_enabled != set) { | |
908 | ws->autosleep_enabled = set; | |
909 | if (ws->active) { | |
910 | if (set) | |
911 | ws->start_prevent_time = now; | |
912 | else | |
913 | update_prevent_sleep_time(ws, now); | |
914 | } | |
915 | } | |
916 | spin_unlock_irq(&ws->lock); | |
917 | } | |
918 | rcu_read_unlock(); | |
919 | } | |
920 | #endif /* CONFIG_PM_AUTOSLEEP */ | |
921 | ||
9c034392 RW |
922 | static struct dentry *wakeup_sources_stats_dentry; |
923 | ||
924 | /** | |
925 | * print_wakeup_source_stats - Print wakeup source statistics information. | |
926 | * @m: seq_file to print the statistics into. | |
927 | * @ws: Wakeup source object to print the statistics for. | |
928 | */ | |
929 | static int print_wakeup_source_stats(struct seq_file *m, | |
930 | struct wakeup_source *ws) | |
931 | { | |
932 | unsigned long flags; | |
933 | ktime_t total_time; | |
934 | ktime_t max_time; | |
935 | unsigned long active_count; | |
936 | ktime_t active_time; | |
55850945 | 937 | ktime_t prevent_sleep_time; |
9c034392 RW |
938 | |
939 | spin_lock_irqsave(&ws->lock, flags); | |
940 | ||
941 | total_time = ws->total_time; | |
942 | max_time = ws->max_time; | |
55850945 | 943 | prevent_sleep_time = ws->prevent_sleep_time; |
9c034392 RW |
944 | active_count = ws->active_count; |
945 | if (ws->active) { | |
55850945 RW |
946 | ktime_t now = ktime_get(); |
947 | ||
948 | active_time = ktime_sub(now, ws->last_time); | |
9c034392 RW |
949 | total_time = ktime_add(total_time, active_time); |
950 | if (active_time.tv64 > max_time.tv64) | |
951 | max_time = active_time; | |
55850945 RW |
952 | |
953 | if (ws->autosleep_enabled) | |
954 | prevent_sleep_time = ktime_add(prevent_sleep_time, | |
955 | ktime_sub(now, ws->start_prevent_time)); | |
9c034392 RW |
956 | } else { |
957 | active_time = ktime_set(0, 0); | |
958 | } | |
959 | ||
9f6a240e JP |
960 | 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", |
961 | ws->name, active_count, ws->event_count, | |
962 | ws->wakeup_count, ws->expire_count, | |
963 | ktime_to_ms(active_time), ktime_to_ms(total_time), | |
964 | ktime_to_ms(max_time), ktime_to_ms(ws->last_time), | |
965 | ktime_to_ms(prevent_sleep_time)); | |
9c034392 RW |
966 | |
967 | spin_unlock_irqrestore(&ws->lock, flags); | |
968 | ||
9f6a240e | 969 | return 0; |
9c034392 RW |
970 | } |
971 | ||
972 | /** | |
973 | * wakeup_sources_stats_show - Print wakeup sources statistics information. | |
974 | * @m: seq_file to print the statistics into. | |
975 | */ | |
976 | static int wakeup_sources_stats_show(struct seq_file *m, void *unused) | |
977 | { | |
978 | struct wakeup_source *ws; | |
979 | ||
30e3ce6d RW |
980 | seq_puts(m, "name\t\tactive_count\tevent_count\twakeup_count\t" |
981 | "expire_count\tactive_since\ttotal_time\tmax_time\t" | |
55850945 | 982 | "last_change\tprevent_suspend_time\n"); |
9c034392 RW |
983 | |
984 | rcu_read_lock(); | |
985 | list_for_each_entry_rcu(ws, &wakeup_sources, entry) | |
986 | print_wakeup_source_stats(m, ws); | |
987 | rcu_read_unlock(); | |
988 | ||
989 | return 0; | |
990 | } | |
991 | ||
992 | static int wakeup_sources_stats_open(struct inode *inode, struct file *file) | |
993 | { | |
994 | return single_open(file, wakeup_sources_stats_show, NULL); | |
995 | } | |
996 | ||
997 | static const struct file_operations wakeup_sources_stats_fops = { | |
998 | .owner = THIS_MODULE, | |
999 | .open = wakeup_sources_stats_open, | |
1000 | .read = seq_read, | |
1001 | .llseek = seq_lseek, | |
1002 | .release = single_release, | |
1003 | }; | |
1004 | ||
1005 | static int __init wakeup_sources_debugfs_init(void) | |
1006 | { | |
1007 | wakeup_sources_stats_dentry = debugfs_create_file("wakeup_sources", | |
1008 | S_IRUGO, NULL, NULL, &wakeup_sources_stats_fops); | |
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | postcore_initcall(wakeup_sources_debugfs_init); |