Commit | Line | Data |
---|---|---|
5e928f77 RW |
1 | /* |
2 | * drivers/base/power/runtime.c - Helper functions for device run-time PM | |
3 | * | |
4 | * Copyright (c) 2009 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc. | |
1bfee5bc | 5 | * Copyright (C) 2010 Alan Stern <stern@rowland.harvard.edu> |
5e928f77 RW |
6 | * |
7 | * This file is released under the GPLv2. | |
8 | */ | |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/pm_runtime.h> | |
7490e442 | 12 | #include "power.h" |
5e928f77 | 13 | |
140a6c94 | 14 | static int rpm_resume(struct device *dev, int rpmflags); |
7490e442 | 15 | static int rpm_suspend(struct device *dev, int rpmflags); |
5e928f77 | 16 | |
4769373c AS |
17 | /** |
18 | * update_pm_runtime_accounting - Update the time accounting of power states | |
19 | * @dev: Device to update the accounting for | |
20 | * | |
21 | * In order to be able to have time accounting of the various power states | |
22 | * (as used by programs such as PowerTOP to show the effectiveness of runtime | |
23 | * PM), we need to track the time spent in each state. | |
24 | * update_pm_runtime_accounting must be called each time before the | |
25 | * runtime_status field is updated, to account the time in the old state | |
26 | * correctly. | |
27 | */ | |
28 | void update_pm_runtime_accounting(struct device *dev) | |
29 | { | |
30 | unsigned long now = jiffies; | |
31 | int delta; | |
32 | ||
33 | delta = now - dev->power.accounting_timestamp; | |
34 | ||
35 | if (delta < 0) | |
36 | delta = 0; | |
37 | ||
38 | dev->power.accounting_timestamp = now; | |
39 | ||
40 | if (dev->power.disable_depth > 0) | |
41 | return; | |
42 | ||
43 | if (dev->power.runtime_status == RPM_SUSPENDED) | |
44 | dev->power.suspended_jiffies += delta; | |
45 | else | |
46 | dev->power.active_jiffies += delta; | |
47 | } | |
48 | ||
49 | static void __update_runtime_status(struct device *dev, enum rpm_status status) | |
50 | { | |
51 | update_pm_runtime_accounting(dev); | |
52 | dev->power.runtime_status = status; | |
53 | } | |
54 | ||
5e928f77 RW |
55 | /** |
56 | * pm_runtime_deactivate_timer - Deactivate given device's suspend timer. | |
57 | * @dev: Device to handle. | |
58 | */ | |
59 | static void pm_runtime_deactivate_timer(struct device *dev) | |
60 | { | |
61 | if (dev->power.timer_expires > 0) { | |
62 | del_timer(&dev->power.suspend_timer); | |
63 | dev->power.timer_expires = 0; | |
64 | } | |
65 | } | |
66 | ||
67 | /** | |
68 | * pm_runtime_cancel_pending - Deactivate suspend timer and cancel requests. | |
69 | * @dev: Device to handle. | |
70 | */ | |
71 | static void pm_runtime_cancel_pending(struct device *dev) | |
72 | { | |
73 | pm_runtime_deactivate_timer(dev); | |
74 | /* | |
75 | * In case there's a request pending, make sure its work function will | |
76 | * return without doing anything. | |
77 | */ | |
78 | dev->power.request = RPM_REQ_NONE; | |
79 | } | |
80 | ||
15bcb91d AS |
81 | /* |
82 | * pm_runtime_autosuspend_expiration - Get a device's autosuspend-delay expiration time. | |
83 | * @dev: Device to handle. | |
84 | * | |
85 | * Compute the autosuspend-delay expiration time based on the device's | |
86 | * power.last_busy time. If the delay has already expired or is disabled | |
87 | * (negative) or the power.use_autosuspend flag isn't set, return 0. | |
88 | * Otherwise return the expiration time in jiffies (adjusted to be nonzero). | |
89 | * | |
90 | * This function may be called either with or without dev->power.lock held. | |
91 | * Either way it can be racy, since power.last_busy may be updated at any time. | |
92 | */ | |
93 | unsigned long pm_runtime_autosuspend_expiration(struct device *dev) | |
94 | { | |
95 | int autosuspend_delay; | |
96 | long elapsed; | |
97 | unsigned long last_busy; | |
98 | unsigned long expires = 0; | |
99 | ||
100 | if (!dev->power.use_autosuspend) | |
101 | goto out; | |
102 | ||
103 | autosuspend_delay = ACCESS_ONCE(dev->power.autosuspend_delay); | |
104 | if (autosuspend_delay < 0) | |
105 | goto out; | |
106 | ||
107 | last_busy = ACCESS_ONCE(dev->power.last_busy); | |
108 | elapsed = jiffies - last_busy; | |
109 | if (elapsed < 0) | |
110 | goto out; /* jiffies has wrapped around. */ | |
111 | ||
112 | /* | |
113 | * If the autosuspend_delay is >= 1 second, align the timer by rounding | |
114 | * up to the nearest second. | |
115 | */ | |
116 | expires = last_busy + msecs_to_jiffies(autosuspend_delay); | |
117 | if (autosuspend_delay >= 1000) | |
118 | expires = round_jiffies(expires); | |
119 | expires += !expires; | |
120 | if (elapsed >= expires - last_busy) | |
121 | expires = 0; /* Already expired. */ | |
122 | ||
123 | out: | |
124 | return expires; | |
125 | } | |
126 | EXPORT_SYMBOL_GPL(pm_runtime_autosuspend_expiration); | |
127 | ||
5e928f77 | 128 | /** |
1bfee5bc AS |
129 | * rpm_check_suspend_allowed - Test whether a device may be suspended. |
130 | * @dev: Device to test. | |
5e928f77 | 131 | */ |
1bfee5bc | 132 | static int rpm_check_suspend_allowed(struct device *dev) |
5e928f77 RW |
133 | { |
134 | int retval = 0; | |
135 | ||
5e928f77 RW |
136 | if (dev->power.runtime_error) |
137 | retval = -EINVAL; | |
5e928f77 | 138 | else if (atomic_read(&dev->power.usage_count) > 0 |
1bfee5bc | 139 | || dev->power.disable_depth > 0) |
5e928f77 RW |
140 | retval = -EAGAIN; |
141 | else if (!pm_children_suspended(dev)) | |
142 | retval = -EBUSY; | |
1bfee5bc AS |
143 | |
144 | /* Pending resume requests take precedence over suspends. */ | |
145 | else if ((dev->power.deferred_resume | |
146 | && dev->power.status == RPM_SUSPENDING) | |
147 | || (dev->power.request_pending | |
148 | && dev->power.request == RPM_REQ_RESUME)) | |
149 | retval = -EAGAIN; | |
150 | else if (dev->power.runtime_status == RPM_SUSPENDED) | |
151 | retval = 1; | |
152 | ||
153 | return retval; | |
154 | } | |
155 | ||
156 | ||
157 | /** | |
140a6c94 | 158 | * rpm_idle - Notify device bus type if the device can be suspended. |
1bfee5bc AS |
159 | * @dev: Device to notify the bus type about. |
160 | * @rpmflags: Flag bits. | |
161 | * | |
162 | * Check if the device's run-time PM status allows it to be suspended. If | |
163 | * another idle notification has been started earlier, return immediately. If | |
164 | * the RPM_ASYNC flag is set then queue an idle-notification request; otherwise | |
165 | * run the ->runtime_idle() callback directly. | |
166 | * | |
167 | * This function must be called under dev->power.lock with interrupts disabled. | |
168 | */ | |
140a6c94 | 169 | static int rpm_idle(struct device *dev, int rpmflags) |
1bfee5bc AS |
170 | __releases(&dev->power.lock) __acquires(&dev->power.lock) |
171 | { | |
172 | int retval; | |
173 | ||
174 | retval = rpm_check_suspend_allowed(dev); | |
175 | if (retval < 0) | |
176 | ; /* Conditions are wrong. */ | |
177 | ||
178 | /* Idle notifications are allowed only in the RPM_ACTIVE state. */ | |
179 | else if (dev->power.runtime_status != RPM_ACTIVE) | |
180 | retval = -EAGAIN; | |
181 | ||
182 | /* | |
183 | * Any pending request other than an idle notification takes | |
184 | * precedence over us, except that the timer may be running. | |
185 | */ | |
186 | else if (dev->power.request_pending && | |
187 | dev->power.request > RPM_REQ_IDLE) | |
188 | retval = -EAGAIN; | |
189 | ||
190 | /* Act as though RPM_NOWAIT is always set. */ | |
191 | else if (dev->power.idle_notification) | |
192 | retval = -EINPROGRESS; | |
5e928f77 RW |
193 | if (retval) |
194 | goto out; | |
195 | ||
1bfee5bc AS |
196 | /* Pending requests need to be canceled. */ |
197 | dev->power.request = RPM_REQ_NONE; | |
198 | ||
7490e442 AS |
199 | if (dev->power.no_callbacks) { |
200 | /* Assume ->runtime_idle() callback would have suspended. */ | |
201 | retval = rpm_suspend(dev, rpmflags); | |
202 | goto out; | |
203 | } | |
204 | ||
1bfee5bc AS |
205 | /* Carry out an asynchronous or a synchronous idle notification. */ |
206 | if (rpmflags & RPM_ASYNC) { | |
207 | dev->power.request = RPM_REQ_IDLE; | |
208 | if (!dev->power.request_pending) { | |
209 | dev->power.request_pending = true; | |
210 | queue_work(pm_wq, &dev->power.work); | |
5e928f77 | 211 | } |
1bfee5bc | 212 | goto out; |
5e928f77 RW |
213 | } |
214 | ||
215 | dev->power.idle_notification = true; | |
216 | ||
217 | if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_idle) { | |
218 | spin_unlock_irq(&dev->power.lock); | |
219 | ||
220 | dev->bus->pm->runtime_idle(dev); | |
221 | ||
a6ab7aa9 RW |
222 | spin_lock_irq(&dev->power.lock); |
223 | } else if (dev->type && dev->type->pm && dev->type->pm->runtime_idle) { | |
224 | spin_unlock_irq(&dev->power.lock); | |
225 | ||
226 | dev->type->pm->runtime_idle(dev); | |
227 | ||
228 | spin_lock_irq(&dev->power.lock); | |
229 | } else if (dev->class && dev->class->pm | |
230 | && dev->class->pm->runtime_idle) { | |
231 | spin_unlock_irq(&dev->power.lock); | |
232 | ||
233 | dev->class->pm->runtime_idle(dev); | |
234 | ||
5e928f77 RW |
235 | spin_lock_irq(&dev->power.lock); |
236 | } | |
237 | ||
238 | dev->power.idle_notification = false; | |
239 | wake_up_all(&dev->power.wait_queue); | |
240 | ||
241 | out: | |
5e928f77 RW |
242 | return retval; |
243 | } | |
244 | ||
245 | /** | |
140a6c94 | 246 | * rpm_suspend - Carry out run-time suspend of given device. |
5e928f77 | 247 | * @dev: Device to suspend. |
3f9af051 | 248 | * @rpmflags: Flag bits. |
5e928f77 | 249 | * |
1bfee5bc AS |
250 | * Check if the device's run-time PM status allows it to be suspended. If |
251 | * another suspend has been started earlier, either return immediately or wait | |
252 | * for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC flags. Cancel a | |
253 | * pending idle notification. If the RPM_ASYNC flag is set then queue a | |
254 | * suspend request; otherwise run the ->runtime_suspend() callback directly. | |
255 | * If a deferred resume was requested while the callback was running then carry | |
256 | * it out; otherwise send an idle notification for the device (if the suspend | |
257 | * failed) or for its parent (if the suspend succeeded). | |
5e928f77 RW |
258 | * |
259 | * This function must be called under dev->power.lock with interrupts disabled. | |
260 | */ | |
140a6c94 | 261 | static int rpm_suspend(struct device *dev, int rpmflags) |
5e928f77 RW |
262 | __releases(&dev->power.lock) __acquires(&dev->power.lock) |
263 | { | |
264 | struct device *parent = NULL; | |
265 | bool notify = false; | |
1bfee5bc | 266 | int retval; |
5e928f77 | 267 | |
3f9af051 | 268 | dev_dbg(dev, "%s flags 0x%x\n", __func__, rpmflags); |
5e928f77 RW |
269 | |
270 | repeat: | |
1bfee5bc | 271 | retval = rpm_check_suspend_allowed(dev); |
5e928f77 | 272 | |
1bfee5bc AS |
273 | if (retval < 0) |
274 | ; /* Conditions are wrong. */ | |
275 | ||
276 | /* Synchronous suspends are not allowed in the RPM_RESUMING state. */ | |
277 | else if (dev->power.runtime_status == RPM_RESUMING && | |
278 | !(rpmflags & RPM_ASYNC)) | |
5e928f77 | 279 | retval = -EAGAIN; |
1bfee5bc | 280 | if (retval) |
5e928f77 | 281 | goto out; |
5e928f77 | 282 | |
15bcb91d AS |
283 | /* If the autosuspend_delay time hasn't expired yet, reschedule. */ |
284 | if ((rpmflags & RPM_AUTO) | |
285 | && dev->power.runtime_status != RPM_SUSPENDING) { | |
286 | unsigned long expires = pm_runtime_autosuspend_expiration(dev); | |
287 | ||
288 | if (expires != 0) { | |
289 | /* Pending requests need to be canceled. */ | |
290 | dev->power.request = RPM_REQ_NONE; | |
291 | ||
292 | /* | |
293 | * Optimization: If the timer is already running and is | |
294 | * set to expire at or before the autosuspend delay, | |
295 | * avoid the overhead of resetting it. Just let it | |
296 | * expire; pm_suspend_timer_fn() will take care of the | |
297 | * rest. | |
298 | */ | |
299 | if (!(dev->power.timer_expires && time_before_eq( | |
300 | dev->power.timer_expires, expires))) { | |
301 | dev->power.timer_expires = expires; | |
302 | mod_timer(&dev->power.suspend_timer, expires); | |
303 | } | |
304 | dev->power.timer_autosuspends = 1; | |
305 | goto out; | |
306 | } | |
307 | } | |
308 | ||
5e928f77 RW |
309 | /* Other scheduled or pending requests need to be canceled. */ |
310 | pm_runtime_cancel_pending(dev); | |
311 | ||
5e928f77 RW |
312 | if (dev->power.runtime_status == RPM_SUSPENDING) { |
313 | DEFINE_WAIT(wait); | |
314 | ||
1bfee5bc | 315 | if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) { |
5e928f77 RW |
316 | retval = -EINPROGRESS; |
317 | goto out; | |
318 | } | |
319 | ||
320 | /* Wait for the other suspend running in parallel with us. */ | |
321 | for (;;) { | |
322 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
323 | TASK_UNINTERRUPTIBLE); | |
324 | if (dev->power.runtime_status != RPM_SUSPENDING) | |
325 | break; | |
326 | ||
327 | spin_unlock_irq(&dev->power.lock); | |
328 | ||
329 | schedule(); | |
330 | ||
331 | spin_lock_irq(&dev->power.lock); | |
332 | } | |
333 | finish_wait(&dev->power.wait_queue, &wait); | |
334 | goto repeat; | |
335 | } | |
336 | ||
7490e442 AS |
337 | dev->power.deferred_resume = false; |
338 | if (dev->power.no_callbacks) | |
339 | goto no_callback; /* Assume success. */ | |
340 | ||
1bfee5bc AS |
341 | /* Carry out an asynchronous or a synchronous suspend. */ |
342 | if (rpmflags & RPM_ASYNC) { | |
15bcb91d AS |
343 | dev->power.request = (rpmflags & RPM_AUTO) ? |
344 | RPM_REQ_AUTOSUSPEND : RPM_REQ_SUSPEND; | |
1bfee5bc AS |
345 | if (!dev->power.request_pending) { |
346 | dev->power.request_pending = true; | |
347 | queue_work(pm_wq, &dev->power.work); | |
348 | } | |
349 | goto out; | |
350 | } | |
351 | ||
8d4b9d1b | 352 | __update_runtime_status(dev, RPM_SUSPENDING); |
5e928f77 RW |
353 | |
354 | if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_suspend) { | |
355 | spin_unlock_irq(&dev->power.lock); | |
356 | ||
357 | retval = dev->bus->pm->runtime_suspend(dev); | |
358 | ||
a6ab7aa9 RW |
359 | spin_lock_irq(&dev->power.lock); |
360 | dev->power.runtime_error = retval; | |
361 | } else if (dev->type && dev->type->pm | |
362 | && dev->type->pm->runtime_suspend) { | |
363 | spin_unlock_irq(&dev->power.lock); | |
364 | ||
365 | retval = dev->type->pm->runtime_suspend(dev); | |
366 | ||
367 | spin_lock_irq(&dev->power.lock); | |
368 | dev->power.runtime_error = retval; | |
369 | } else if (dev->class && dev->class->pm | |
370 | && dev->class->pm->runtime_suspend) { | |
371 | spin_unlock_irq(&dev->power.lock); | |
372 | ||
373 | retval = dev->class->pm->runtime_suspend(dev); | |
374 | ||
5e928f77 RW |
375 | spin_lock_irq(&dev->power.lock); |
376 | dev->power.runtime_error = retval; | |
377 | } else { | |
378 | retval = -ENOSYS; | |
379 | } | |
380 | ||
381 | if (retval) { | |
8d4b9d1b | 382 | __update_runtime_status(dev, RPM_ACTIVE); |
1bfee5bc | 383 | dev->power.deferred_resume = 0; |
5e928f77 | 384 | if (retval == -EAGAIN || retval == -EBUSY) { |
240c7337 AS |
385 | if (dev->power.timer_expires == 0) |
386 | notify = true; | |
5e928f77 | 387 | dev->power.runtime_error = 0; |
240c7337 AS |
388 | } else { |
389 | pm_runtime_cancel_pending(dev); | |
5e928f77 RW |
390 | } |
391 | } else { | |
7490e442 | 392 | no_callback: |
8d4b9d1b | 393 | __update_runtime_status(dev, RPM_SUSPENDED); |
240c7337 | 394 | pm_runtime_deactivate_timer(dev); |
5e928f77 RW |
395 | |
396 | if (dev->parent) { | |
397 | parent = dev->parent; | |
398 | atomic_add_unless(&parent->power.child_count, -1, 0); | |
399 | } | |
400 | } | |
401 | wake_up_all(&dev->power.wait_queue); | |
402 | ||
403 | if (dev->power.deferred_resume) { | |
140a6c94 | 404 | rpm_resume(dev, 0); |
5e928f77 RW |
405 | retval = -EAGAIN; |
406 | goto out; | |
407 | } | |
408 | ||
409 | if (notify) | |
140a6c94 | 410 | rpm_idle(dev, 0); |
5e928f77 RW |
411 | |
412 | if (parent && !parent->power.ignore_children) { | |
413 | spin_unlock_irq(&dev->power.lock); | |
414 | ||
415 | pm_request_idle(parent); | |
416 | ||
417 | spin_lock_irq(&dev->power.lock); | |
418 | } | |
419 | ||
420 | out: | |
3f9af051 | 421 | dev_dbg(dev, "%s returns %d\n", __func__, retval); |
5e928f77 RW |
422 | |
423 | return retval; | |
424 | } | |
425 | ||
426 | /** | |
140a6c94 | 427 | * rpm_resume - Carry out run-time resume of given device. |
5e928f77 | 428 | * @dev: Device to resume. |
3f9af051 | 429 | * @rpmflags: Flag bits. |
5e928f77 | 430 | * |
1bfee5bc AS |
431 | * Check if the device's run-time PM status allows it to be resumed. Cancel |
432 | * any scheduled or pending requests. If another resume has been started | |
433 | * earlier, either return imediately or wait for it to finish, depending on the | |
434 | * RPM_NOWAIT and RPM_ASYNC flags. Similarly, if there's a suspend running in | |
435 | * parallel with this function, either tell the other process to resume after | |
436 | * suspending (deferred_resume) or wait for it to finish. If the RPM_ASYNC | |
437 | * flag is set then queue a resume request; otherwise run the | |
438 | * ->runtime_resume() callback directly. Queue an idle notification for the | |
439 | * device if the resume succeeded. | |
5e928f77 RW |
440 | * |
441 | * This function must be called under dev->power.lock with interrupts disabled. | |
442 | */ | |
140a6c94 | 443 | static int rpm_resume(struct device *dev, int rpmflags) |
5e928f77 RW |
444 | __releases(&dev->power.lock) __acquires(&dev->power.lock) |
445 | { | |
446 | struct device *parent = NULL; | |
447 | int retval = 0; | |
448 | ||
3f9af051 | 449 | dev_dbg(dev, "%s flags 0x%x\n", __func__, rpmflags); |
5e928f77 RW |
450 | |
451 | repeat: | |
1bfee5bc | 452 | if (dev->power.runtime_error) |
5e928f77 | 453 | retval = -EINVAL; |
1bfee5bc AS |
454 | else if (dev->power.disable_depth > 0) |
455 | retval = -EAGAIN; | |
456 | if (retval) | |
5e928f77 | 457 | goto out; |
5e928f77 | 458 | |
15bcb91d AS |
459 | /* |
460 | * Other scheduled or pending requests need to be canceled. Small | |
461 | * optimization: If an autosuspend timer is running, leave it running | |
462 | * rather than cancelling it now only to restart it again in the near | |
463 | * future. | |
464 | */ | |
465 | dev->power.request = RPM_REQ_NONE; | |
466 | if (!dev->power.timer_autosuspends) | |
467 | pm_runtime_deactivate_timer(dev); | |
5e928f77 | 468 | |
1bfee5bc | 469 | if (dev->power.runtime_status == RPM_ACTIVE) { |
5e928f77 | 470 | retval = 1; |
5e928f77 | 471 | goto out; |
1bfee5bc | 472 | } |
5e928f77 RW |
473 | |
474 | if (dev->power.runtime_status == RPM_RESUMING | |
475 | || dev->power.runtime_status == RPM_SUSPENDING) { | |
476 | DEFINE_WAIT(wait); | |
477 | ||
1bfee5bc | 478 | if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) { |
5e928f77 RW |
479 | if (dev->power.runtime_status == RPM_SUSPENDING) |
480 | dev->power.deferred_resume = true; | |
1bfee5bc AS |
481 | else |
482 | retval = -EINPROGRESS; | |
5e928f77 RW |
483 | goto out; |
484 | } | |
485 | ||
486 | /* Wait for the operation carried out in parallel with us. */ | |
487 | for (;;) { | |
488 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
489 | TASK_UNINTERRUPTIBLE); | |
490 | if (dev->power.runtime_status != RPM_RESUMING | |
491 | && dev->power.runtime_status != RPM_SUSPENDING) | |
492 | break; | |
493 | ||
494 | spin_unlock_irq(&dev->power.lock); | |
495 | ||
496 | schedule(); | |
497 | ||
498 | spin_lock_irq(&dev->power.lock); | |
499 | } | |
500 | finish_wait(&dev->power.wait_queue, &wait); | |
501 | goto repeat; | |
502 | } | |
503 | ||
7490e442 AS |
504 | /* |
505 | * See if we can skip waking up the parent. This is safe only if | |
506 | * power.no_callbacks is set, because otherwise we don't know whether | |
507 | * the resume will actually succeed. | |
508 | */ | |
509 | if (dev->power.no_callbacks && !parent && dev->parent) { | |
510 | spin_lock(&dev->parent->power.lock); | |
511 | if (dev->parent->power.disable_depth > 0 | |
512 | || dev->parent->power.ignore_children | |
513 | || dev->parent->power.runtime_status == RPM_ACTIVE) { | |
514 | atomic_inc(&dev->parent->power.child_count); | |
515 | spin_unlock(&dev->parent->power.lock); | |
516 | goto no_callback; /* Assume success. */ | |
517 | } | |
518 | spin_unlock(&dev->parent->power.lock); | |
519 | } | |
520 | ||
1bfee5bc AS |
521 | /* Carry out an asynchronous or a synchronous resume. */ |
522 | if (rpmflags & RPM_ASYNC) { | |
523 | dev->power.request = RPM_REQ_RESUME; | |
524 | if (!dev->power.request_pending) { | |
525 | dev->power.request_pending = true; | |
526 | queue_work(pm_wq, &dev->power.work); | |
527 | } | |
528 | retval = 0; | |
529 | goto out; | |
530 | } | |
531 | ||
5e928f77 RW |
532 | if (!parent && dev->parent) { |
533 | /* | |
534 | * Increment the parent's resume counter and resume it if | |
535 | * necessary. | |
536 | */ | |
537 | parent = dev->parent; | |
862f89b3 | 538 | spin_unlock(&dev->power.lock); |
5e928f77 RW |
539 | |
540 | pm_runtime_get_noresume(parent); | |
541 | ||
862f89b3 | 542 | spin_lock(&parent->power.lock); |
5e928f77 RW |
543 | /* |
544 | * We can resume if the parent's run-time PM is disabled or it | |
545 | * is set to ignore children. | |
546 | */ | |
547 | if (!parent->power.disable_depth | |
548 | && !parent->power.ignore_children) { | |
140a6c94 | 549 | rpm_resume(parent, 0); |
5e928f77 RW |
550 | if (parent->power.runtime_status != RPM_ACTIVE) |
551 | retval = -EBUSY; | |
552 | } | |
862f89b3 | 553 | spin_unlock(&parent->power.lock); |
5e928f77 | 554 | |
862f89b3 | 555 | spin_lock(&dev->power.lock); |
5e928f77 RW |
556 | if (retval) |
557 | goto out; | |
558 | goto repeat; | |
559 | } | |
560 | ||
7490e442 AS |
561 | if (dev->power.no_callbacks) |
562 | goto no_callback; /* Assume success. */ | |
563 | ||
8d4b9d1b | 564 | __update_runtime_status(dev, RPM_RESUMING); |
5e928f77 RW |
565 | |
566 | if (dev->bus && dev->bus->pm && dev->bus->pm->runtime_resume) { | |
567 | spin_unlock_irq(&dev->power.lock); | |
568 | ||
569 | retval = dev->bus->pm->runtime_resume(dev); | |
570 | ||
a6ab7aa9 RW |
571 | spin_lock_irq(&dev->power.lock); |
572 | dev->power.runtime_error = retval; | |
573 | } else if (dev->type && dev->type->pm | |
574 | && dev->type->pm->runtime_resume) { | |
575 | spin_unlock_irq(&dev->power.lock); | |
576 | ||
577 | retval = dev->type->pm->runtime_resume(dev); | |
578 | ||
579 | spin_lock_irq(&dev->power.lock); | |
580 | dev->power.runtime_error = retval; | |
581 | } else if (dev->class && dev->class->pm | |
582 | && dev->class->pm->runtime_resume) { | |
583 | spin_unlock_irq(&dev->power.lock); | |
584 | ||
585 | retval = dev->class->pm->runtime_resume(dev); | |
586 | ||
5e928f77 RW |
587 | spin_lock_irq(&dev->power.lock); |
588 | dev->power.runtime_error = retval; | |
589 | } else { | |
590 | retval = -ENOSYS; | |
591 | } | |
592 | ||
593 | if (retval) { | |
8d4b9d1b | 594 | __update_runtime_status(dev, RPM_SUSPENDED); |
5e928f77 RW |
595 | pm_runtime_cancel_pending(dev); |
596 | } else { | |
7490e442 | 597 | no_callback: |
8d4b9d1b | 598 | __update_runtime_status(dev, RPM_ACTIVE); |
5e928f77 RW |
599 | if (parent) |
600 | atomic_inc(&parent->power.child_count); | |
601 | } | |
602 | wake_up_all(&dev->power.wait_queue); | |
603 | ||
604 | if (!retval) | |
140a6c94 | 605 | rpm_idle(dev, RPM_ASYNC); |
5e928f77 RW |
606 | |
607 | out: | |
608 | if (parent) { | |
609 | spin_unlock_irq(&dev->power.lock); | |
610 | ||
611 | pm_runtime_put(parent); | |
612 | ||
613 | spin_lock_irq(&dev->power.lock); | |
614 | } | |
615 | ||
3f9af051 | 616 | dev_dbg(dev, "%s returns %d\n", __func__, retval); |
5e928f77 RW |
617 | |
618 | return retval; | |
619 | } | |
620 | ||
5e928f77 RW |
621 | /** |
622 | * pm_runtime_work - Universal run-time PM work function. | |
623 | * @work: Work structure used for scheduling the execution of this function. | |
624 | * | |
625 | * Use @work to get the device object the work is to be done for, determine what | |
626 | * is to be done and execute the appropriate run-time PM function. | |
627 | */ | |
628 | static void pm_runtime_work(struct work_struct *work) | |
629 | { | |
630 | struct device *dev = container_of(work, struct device, power.work); | |
631 | enum rpm_request req; | |
632 | ||
633 | spin_lock_irq(&dev->power.lock); | |
634 | ||
635 | if (!dev->power.request_pending) | |
636 | goto out; | |
637 | ||
638 | req = dev->power.request; | |
639 | dev->power.request = RPM_REQ_NONE; | |
640 | dev->power.request_pending = false; | |
641 | ||
642 | switch (req) { | |
643 | case RPM_REQ_NONE: | |
644 | break; | |
645 | case RPM_REQ_IDLE: | |
140a6c94 | 646 | rpm_idle(dev, RPM_NOWAIT); |
5e928f77 RW |
647 | break; |
648 | case RPM_REQ_SUSPEND: | |
140a6c94 | 649 | rpm_suspend(dev, RPM_NOWAIT); |
5e928f77 | 650 | break; |
15bcb91d AS |
651 | case RPM_REQ_AUTOSUSPEND: |
652 | rpm_suspend(dev, RPM_NOWAIT | RPM_AUTO); | |
653 | break; | |
5e928f77 | 654 | case RPM_REQ_RESUME: |
140a6c94 | 655 | rpm_resume(dev, RPM_NOWAIT); |
5e928f77 RW |
656 | break; |
657 | } | |
658 | ||
659 | out: | |
660 | spin_unlock_irq(&dev->power.lock); | |
661 | } | |
662 | ||
5e928f77 RW |
663 | /** |
664 | * pm_suspend_timer_fn - Timer function for pm_schedule_suspend(). | |
665 | * @data: Device pointer passed by pm_schedule_suspend(). | |
666 | * | |
1bfee5bc | 667 | * Check if the time is right and queue a suspend request. |
5e928f77 RW |
668 | */ |
669 | static void pm_suspend_timer_fn(unsigned long data) | |
670 | { | |
671 | struct device *dev = (struct device *)data; | |
672 | unsigned long flags; | |
673 | unsigned long expires; | |
674 | ||
675 | spin_lock_irqsave(&dev->power.lock, flags); | |
676 | ||
677 | expires = dev->power.timer_expires; | |
678 | /* If 'expire' is after 'jiffies' we've been called too early. */ | |
679 | if (expires > 0 && !time_after(expires, jiffies)) { | |
680 | dev->power.timer_expires = 0; | |
15bcb91d AS |
681 | rpm_suspend(dev, dev->power.timer_autosuspends ? |
682 | (RPM_ASYNC | RPM_AUTO) : RPM_ASYNC); | |
5e928f77 RW |
683 | } |
684 | ||
685 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
686 | } | |
687 | ||
688 | /** | |
689 | * pm_schedule_suspend - Set up a timer to submit a suspend request in future. | |
690 | * @dev: Device to suspend. | |
691 | * @delay: Time to wait before submitting a suspend request, in milliseconds. | |
692 | */ | |
693 | int pm_schedule_suspend(struct device *dev, unsigned int delay) | |
694 | { | |
695 | unsigned long flags; | |
1bfee5bc | 696 | int retval; |
5e928f77 RW |
697 | |
698 | spin_lock_irqsave(&dev->power.lock, flags); | |
699 | ||
5e928f77 | 700 | if (!delay) { |
140a6c94 | 701 | retval = rpm_suspend(dev, RPM_ASYNC); |
5e928f77 RW |
702 | goto out; |
703 | } | |
704 | ||
1bfee5bc | 705 | retval = rpm_check_suspend_allowed(dev); |
5e928f77 RW |
706 | if (retval) |
707 | goto out; | |
708 | ||
1bfee5bc AS |
709 | /* Other scheduled or pending requests need to be canceled. */ |
710 | pm_runtime_cancel_pending(dev); | |
711 | ||
5e928f77 | 712 | dev->power.timer_expires = jiffies + msecs_to_jiffies(delay); |
1bfee5bc | 713 | dev->power.timer_expires += !dev->power.timer_expires; |
15bcb91d | 714 | dev->power.timer_autosuspends = 0; |
5e928f77 RW |
715 | mod_timer(&dev->power.suspend_timer, dev->power.timer_expires); |
716 | ||
717 | out: | |
718 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
719 | ||
720 | return retval; | |
721 | } | |
722 | EXPORT_SYMBOL_GPL(pm_schedule_suspend); | |
723 | ||
5e928f77 | 724 | /** |
140a6c94 AS |
725 | * __pm_runtime_idle - Entry point for run-time idle operations. |
726 | * @dev: Device to send idle notification for. | |
727 | * @rpmflags: Flag bits. | |
728 | * | |
729 | * If the RPM_GET_PUT flag is set, decrement the device's usage count and | |
730 | * return immediately if it is larger than zero. Then carry out an idle | |
731 | * notification, either synchronous or asynchronous. | |
732 | * | |
733 | * This routine may be called in atomic context if the RPM_ASYNC flag is set. | |
5e928f77 | 734 | */ |
140a6c94 | 735 | int __pm_runtime_idle(struct device *dev, int rpmflags) |
5e928f77 RW |
736 | { |
737 | unsigned long flags; | |
738 | int retval; | |
739 | ||
140a6c94 AS |
740 | if (rpmflags & RPM_GET_PUT) { |
741 | if (!atomic_dec_and_test(&dev->power.usage_count)) | |
742 | return 0; | |
743 | } | |
744 | ||
5e928f77 | 745 | spin_lock_irqsave(&dev->power.lock, flags); |
140a6c94 | 746 | retval = rpm_idle(dev, rpmflags); |
5e928f77 RW |
747 | spin_unlock_irqrestore(&dev->power.lock, flags); |
748 | ||
749 | return retval; | |
750 | } | |
140a6c94 | 751 | EXPORT_SYMBOL_GPL(__pm_runtime_idle); |
5e928f77 RW |
752 | |
753 | /** | |
140a6c94 AS |
754 | * __pm_runtime_suspend - Entry point for run-time put/suspend operations. |
755 | * @dev: Device to suspend. | |
3f9af051 | 756 | * @rpmflags: Flag bits. |
5e928f77 | 757 | * |
15bcb91d AS |
758 | * If the RPM_GET_PUT flag is set, decrement the device's usage count and |
759 | * return immediately if it is larger than zero. Then carry out a suspend, | |
760 | * either synchronous or asynchronous. | |
140a6c94 AS |
761 | * |
762 | * This routine may be called in atomic context if the RPM_ASYNC flag is set. | |
5e928f77 | 763 | */ |
140a6c94 | 764 | int __pm_runtime_suspend(struct device *dev, int rpmflags) |
5e928f77 | 765 | { |
140a6c94 | 766 | unsigned long flags; |
1d531c14 | 767 | int retval; |
5e928f77 | 768 | |
15bcb91d AS |
769 | if (rpmflags & RPM_GET_PUT) { |
770 | if (!atomic_dec_and_test(&dev->power.usage_count)) | |
771 | return 0; | |
772 | } | |
773 | ||
140a6c94 AS |
774 | spin_lock_irqsave(&dev->power.lock, flags); |
775 | retval = rpm_suspend(dev, rpmflags); | |
776 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
5e928f77 RW |
777 | |
778 | return retval; | |
779 | } | |
140a6c94 | 780 | EXPORT_SYMBOL_GPL(__pm_runtime_suspend); |
5e928f77 RW |
781 | |
782 | /** | |
140a6c94 AS |
783 | * __pm_runtime_resume - Entry point for run-time resume operations. |
784 | * @dev: Device to resume. | |
3f9af051 | 785 | * @rpmflags: Flag bits. |
5e928f77 | 786 | * |
140a6c94 AS |
787 | * If the RPM_GET_PUT flag is set, increment the device's usage count. Then |
788 | * carry out a resume, either synchronous or asynchronous. | |
789 | * | |
790 | * This routine may be called in atomic context if the RPM_ASYNC flag is set. | |
5e928f77 | 791 | */ |
140a6c94 | 792 | int __pm_runtime_resume(struct device *dev, int rpmflags) |
5e928f77 | 793 | { |
140a6c94 AS |
794 | unsigned long flags; |
795 | int retval; | |
5e928f77 | 796 | |
140a6c94 AS |
797 | if (rpmflags & RPM_GET_PUT) |
798 | atomic_inc(&dev->power.usage_count); | |
799 | ||
800 | spin_lock_irqsave(&dev->power.lock, flags); | |
801 | retval = rpm_resume(dev, rpmflags); | |
802 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
5e928f77 RW |
803 | |
804 | return retval; | |
805 | } | |
140a6c94 | 806 | EXPORT_SYMBOL_GPL(__pm_runtime_resume); |
5e928f77 RW |
807 | |
808 | /** | |
809 | * __pm_runtime_set_status - Set run-time PM status of a device. | |
810 | * @dev: Device to handle. | |
811 | * @status: New run-time PM status of the device. | |
812 | * | |
813 | * If run-time PM of the device is disabled or its power.runtime_error field is | |
814 | * different from zero, the status may be changed either to RPM_ACTIVE, or to | |
815 | * RPM_SUSPENDED, as long as that reflects the actual state of the device. | |
816 | * However, if the device has a parent and the parent is not active, and the | |
817 | * parent's power.ignore_children flag is unset, the device's status cannot be | |
818 | * set to RPM_ACTIVE, so -EBUSY is returned in that case. | |
819 | * | |
820 | * If successful, __pm_runtime_set_status() clears the power.runtime_error field | |
821 | * and the device parent's counter of unsuspended children is modified to | |
822 | * reflect the new status. If the new status is RPM_SUSPENDED, an idle | |
823 | * notification request for the parent is submitted. | |
824 | */ | |
825 | int __pm_runtime_set_status(struct device *dev, unsigned int status) | |
826 | { | |
827 | struct device *parent = dev->parent; | |
828 | unsigned long flags; | |
829 | bool notify_parent = false; | |
830 | int error = 0; | |
831 | ||
832 | if (status != RPM_ACTIVE && status != RPM_SUSPENDED) | |
833 | return -EINVAL; | |
834 | ||
835 | spin_lock_irqsave(&dev->power.lock, flags); | |
836 | ||
837 | if (!dev->power.runtime_error && !dev->power.disable_depth) { | |
838 | error = -EAGAIN; | |
839 | goto out; | |
840 | } | |
841 | ||
842 | if (dev->power.runtime_status == status) | |
843 | goto out_set; | |
844 | ||
845 | if (status == RPM_SUSPENDED) { | |
846 | /* It always is possible to set the status to 'suspended'. */ | |
847 | if (parent) { | |
848 | atomic_add_unless(&parent->power.child_count, -1, 0); | |
849 | notify_parent = !parent->power.ignore_children; | |
850 | } | |
851 | goto out_set; | |
852 | } | |
853 | ||
854 | if (parent) { | |
bab636b9 | 855 | spin_lock_nested(&parent->power.lock, SINGLE_DEPTH_NESTING); |
5e928f77 RW |
856 | |
857 | /* | |
858 | * It is invalid to put an active child under a parent that is | |
859 | * not active, has run-time PM enabled and the | |
860 | * 'power.ignore_children' flag unset. | |
861 | */ | |
862 | if (!parent->power.disable_depth | |
863 | && !parent->power.ignore_children | |
965c4ac0 | 864 | && parent->power.runtime_status != RPM_ACTIVE) |
5e928f77 | 865 | error = -EBUSY; |
965c4ac0 RW |
866 | else if (dev->power.runtime_status == RPM_SUSPENDED) |
867 | atomic_inc(&parent->power.child_count); | |
5e928f77 | 868 | |
862f89b3 | 869 | spin_unlock(&parent->power.lock); |
5e928f77 RW |
870 | |
871 | if (error) | |
872 | goto out; | |
873 | } | |
874 | ||
875 | out_set: | |
8d4b9d1b | 876 | __update_runtime_status(dev, status); |
5e928f77 RW |
877 | dev->power.runtime_error = 0; |
878 | out: | |
879 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
880 | ||
881 | if (notify_parent) | |
882 | pm_request_idle(parent); | |
883 | ||
884 | return error; | |
885 | } | |
886 | EXPORT_SYMBOL_GPL(__pm_runtime_set_status); | |
887 | ||
888 | /** | |
889 | * __pm_runtime_barrier - Cancel pending requests and wait for completions. | |
890 | * @dev: Device to handle. | |
891 | * | |
892 | * Flush all pending requests for the device from pm_wq and wait for all | |
893 | * run-time PM operations involving the device in progress to complete. | |
894 | * | |
895 | * Should be called under dev->power.lock with interrupts disabled. | |
896 | */ | |
897 | static void __pm_runtime_barrier(struct device *dev) | |
898 | { | |
899 | pm_runtime_deactivate_timer(dev); | |
900 | ||
901 | if (dev->power.request_pending) { | |
902 | dev->power.request = RPM_REQ_NONE; | |
903 | spin_unlock_irq(&dev->power.lock); | |
904 | ||
905 | cancel_work_sync(&dev->power.work); | |
906 | ||
907 | spin_lock_irq(&dev->power.lock); | |
908 | dev->power.request_pending = false; | |
909 | } | |
910 | ||
911 | if (dev->power.runtime_status == RPM_SUSPENDING | |
912 | || dev->power.runtime_status == RPM_RESUMING | |
913 | || dev->power.idle_notification) { | |
914 | DEFINE_WAIT(wait); | |
915 | ||
916 | /* Suspend, wake-up or idle notification in progress. */ | |
917 | for (;;) { | |
918 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
919 | TASK_UNINTERRUPTIBLE); | |
920 | if (dev->power.runtime_status != RPM_SUSPENDING | |
921 | && dev->power.runtime_status != RPM_RESUMING | |
922 | && !dev->power.idle_notification) | |
923 | break; | |
924 | spin_unlock_irq(&dev->power.lock); | |
925 | ||
926 | schedule(); | |
927 | ||
928 | spin_lock_irq(&dev->power.lock); | |
929 | } | |
930 | finish_wait(&dev->power.wait_queue, &wait); | |
931 | } | |
932 | } | |
933 | ||
934 | /** | |
935 | * pm_runtime_barrier - Flush pending requests and wait for completions. | |
936 | * @dev: Device to handle. | |
937 | * | |
938 | * Prevent the device from being suspended by incrementing its usage counter and | |
939 | * if there's a pending resume request for the device, wake the device up. | |
940 | * Next, make sure that all pending requests for the device have been flushed | |
941 | * from pm_wq and wait for all run-time PM operations involving the device in | |
942 | * progress to complete. | |
943 | * | |
944 | * Return value: | |
945 | * 1, if there was a resume request pending and the device had to be woken up, | |
946 | * 0, otherwise | |
947 | */ | |
948 | int pm_runtime_barrier(struct device *dev) | |
949 | { | |
950 | int retval = 0; | |
951 | ||
952 | pm_runtime_get_noresume(dev); | |
953 | spin_lock_irq(&dev->power.lock); | |
954 | ||
955 | if (dev->power.request_pending | |
956 | && dev->power.request == RPM_REQ_RESUME) { | |
140a6c94 | 957 | rpm_resume(dev, 0); |
5e928f77 RW |
958 | retval = 1; |
959 | } | |
960 | ||
961 | __pm_runtime_barrier(dev); | |
962 | ||
963 | spin_unlock_irq(&dev->power.lock); | |
964 | pm_runtime_put_noidle(dev); | |
965 | ||
966 | return retval; | |
967 | } | |
968 | EXPORT_SYMBOL_GPL(pm_runtime_barrier); | |
969 | ||
970 | /** | |
971 | * __pm_runtime_disable - Disable run-time PM of a device. | |
972 | * @dev: Device to handle. | |
973 | * @check_resume: If set, check if there's a resume request for the device. | |
974 | * | |
975 | * Increment power.disable_depth for the device and if was zero previously, | |
976 | * cancel all pending run-time PM requests for the device and wait for all | |
977 | * operations in progress to complete. The device can be either active or | |
978 | * suspended after its run-time PM has been disabled. | |
979 | * | |
980 | * If @check_resume is set and there's a resume request pending when | |
981 | * __pm_runtime_disable() is called and power.disable_depth is zero, the | |
982 | * function will wake up the device before disabling its run-time PM. | |
983 | */ | |
984 | void __pm_runtime_disable(struct device *dev, bool check_resume) | |
985 | { | |
986 | spin_lock_irq(&dev->power.lock); | |
987 | ||
988 | if (dev->power.disable_depth > 0) { | |
989 | dev->power.disable_depth++; | |
990 | goto out; | |
991 | } | |
992 | ||
993 | /* | |
994 | * Wake up the device if there's a resume request pending, because that | |
995 | * means there probably is some I/O to process and disabling run-time PM | |
996 | * shouldn't prevent the device from processing the I/O. | |
997 | */ | |
998 | if (check_resume && dev->power.request_pending | |
999 | && dev->power.request == RPM_REQ_RESUME) { | |
1000 | /* | |
1001 | * Prevent suspends and idle notifications from being carried | |
1002 | * out after we have woken up the device. | |
1003 | */ | |
1004 | pm_runtime_get_noresume(dev); | |
1005 | ||
140a6c94 | 1006 | rpm_resume(dev, 0); |
5e928f77 RW |
1007 | |
1008 | pm_runtime_put_noidle(dev); | |
1009 | } | |
1010 | ||
1011 | if (!dev->power.disable_depth++) | |
1012 | __pm_runtime_barrier(dev); | |
1013 | ||
1014 | out: | |
1015 | spin_unlock_irq(&dev->power.lock); | |
1016 | } | |
1017 | EXPORT_SYMBOL_GPL(__pm_runtime_disable); | |
1018 | ||
1019 | /** | |
1020 | * pm_runtime_enable - Enable run-time PM of a device. | |
1021 | * @dev: Device to handle. | |
1022 | */ | |
1023 | void pm_runtime_enable(struct device *dev) | |
1024 | { | |
1025 | unsigned long flags; | |
1026 | ||
1027 | spin_lock_irqsave(&dev->power.lock, flags); | |
1028 | ||
1029 | if (dev->power.disable_depth > 0) | |
1030 | dev->power.disable_depth--; | |
1031 | else | |
1032 | dev_warn(dev, "Unbalanced %s!\n", __func__); | |
1033 | ||
1034 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1035 | } | |
1036 | EXPORT_SYMBOL_GPL(pm_runtime_enable); | |
1037 | ||
53823639 RW |
1038 | /** |
1039 | * pm_runtime_forbid - Block run-time PM of a device. | |
1040 | * @dev: Device to handle. | |
1041 | * | |
1042 | * Increase the device's usage count and clear its power.runtime_auto flag, | |
1043 | * so that it cannot be suspended at run time until pm_runtime_allow() is called | |
1044 | * for it. | |
1045 | */ | |
1046 | void pm_runtime_forbid(struct device *dev) | |
1047 | { | |
1048 | spin_lock_irq(&dev->power.lock); | |
1049 | if (!dev->power.runtime_auto) | |
1050 | goto out; | |
1051 | ||
1052 | dev->power.runtime_auto = false; | |
1053 | atomic_inc(&dev->power.usage_count); | |
140a6c94 | 1054 | rpm_resume(dev, 0); |
53823639 RW |
1055 | |
1056 | out: | |
1057 | spin_unlock_irq(&dev->power.lock); | |
1058 | } | |
1059 | EXPORT_SYMBOL_GPL(pm_runtime_forbid); | |
1060 | ||
1061 | /** | |
1062 | * pm_runtime_allow - Unblock run-time PM of a device. | |
1063 | * @dev: Device to handle. | |
1064 | * | |
1065 | * Decrease the device's usage count and set its power.runtime_auto flag. | |
1066 | */ | |
1067 | void pm_runtime_allow(struct device *dev) | |
1068 | { | |
1069 | spin_lock_irq(&dev->power.lock); | |
1070 | if (dev->power.runtime_auto) | |
1071 | goto out; | |
1072 | ||
1073 | dev->power.runtime_auto = true; | |
1074 | if (atomic_dec_and_test(&dev->power.usage_count)) | |
15bcb91d | 1075 | rpm_idle(dev, RPM_AUTO); |
53823639 RW |
1076 | |
1077 | out: | |
1078 | spin_unlock_irq(&dev->power.lock); | |
1079 | } | |
1080 | EXPORT_SYMBOL_GPL(pm_runtime_allow); | |
1081 | ||
7490e442 AS |
1082 | /** |
1083 | * pm_runtime_no_callbacks - Ignore run-time PM callbacks for a device. | |
1084 | * @dev: Device to handle. | |
1085 | * | |
1086 | * Set the power.no_callbacks flag, which tells the PM core that this | |
1087 | * device is power-managed through its parent and has no run-time PM | |
1088 | * callbacks of its own. The run-time sysfs attributes will be removed. | |
1089 | * | |
1090 | */ | |
1091 | void pm_runtime_no_callbacks(struct device *dev) | |
1092 | { | |
1093 | spin_lock_irq(&dev->power.lock); | |
1094 | dev->power.no_callbacks = 1; | |
1095 | spin_unlock_irq(&dev->power.lock); | |
1096 | if (device_is_registered(dev)) | |
1097 | rpm_sysfs_remove(dev); | |
1098 | } | |
1099 | EXPORT_SYMBOL_GPL(pm_runtime_no_callbacks); | |
1100 | ||
15bcb91d AS |
1101 | /** |
1102 | * update_autosuspend - Handle a change to a device's autosuspend settings. | |
1103 | * @dev: Device to handle. | |
1104 | * @old_delay: The former autosuspend_delay value. | |
1105 | * @old_use: The former use_autosuspend value. | |
1106 | * | |
1107 | * Prevent runtime suspend if the new delay is negative and use_autosuspend is | |
1108 | * set; otherwise allow it. Send an idle notification if suspends are allowed. | |
1109 | * | |
1110 | * This function must be called under dev->power.lock with interrupts disabled. | |
1111 | */ | |
1112 | static void update_autosuspend(struct device *dev, int old_delay, int old_use) | |
1113 | { | |
1114 | int delay = dev->power.autosuspend_delay; | |
1115 | ||
1116 | /* Should runtime suspend be prevented now? */ | |
1117 | if (dev->power.use_autosuspend && delay < 0) { | |
1118 | ||
1119 | /* If it used to be allowed then prevent it. */ | |
1120 | if (!old_use || old_delay >= 0) { | |
1121 | atomic_inc(&dev->power.usage_count); | |
1122 | rpm_resume(dev, 0); | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | /* Runtime suspend should be allowed now. */ | |
1127 | else { | |
1128 | ||
1129 | /* If it used to be prevented then allow it. */ | |
1130 | if (old_use && old_delay < 0) | |
1131 | atomic_dec(&dev->power.usage_count); | |
1132 | ||
1133 | /* Maybe we can autosuspend now. */ | |
1134 | rpm_idle(dev, RPM_AUTO); | |
1135 | } | |
1136 | } | |
1137 | ||
1138 | /** | |
1139 | * pm_runtime_set_autosuspend_delay - Set a device's autosuspend_delay value. | |
1140 | * @dev: Device to handle. | |
1141 | * @delay: Value of the new delay in milliseconds. | |
1142 | * | |
1143 | * Set the device's power.autosuspend_delay value. If it changes to negative | |
1144 | * and the power.use_autosuspend flag is set, prevent run-time suspends. If it | |
1145 | * changes the other way, allow run-time suspends. | |
1146 | */ | |
1147 | void pm_runtime_set_autosuspend_delay(struct device *dev, int delay) | |
1148 | { | |
1149 | int old_delay, old_use; | |
1150 | ||
1151 | spin_lock_irq(&dev->power.lock); | |
1152 | old_delay = dev->power.autosuspend_delay; | |
1153 | old_use = dev->power.use_autosuspend; | |
1154 | dev->power.autosuspend_delay = delay; | |
1155 | update_autosuspend(dev, old_delay, old_use); | |
1156 | spin_unlock_irq(&dev->power.lock); | |
1157 | } | |
1158 | EXPORT_SYMBOL_GPL(pm_runtime_set_autosuspend_delay); | |
1159 | ||
1160 | /** | |
1161 | * __pm_runtime_use_autosuspend - Set a device's use_autosuspend flag. | |
1162 | * @dev: Device to handle. | |
1163 | * @use: New value for use_autosuspend. | |
1164 | * | |
1165 | * Set the device's power.use_autosuspend flag, and allow or prevent run-time | |
1166 | * suspends as needed. | |
1167 | */ | |
1168 | void __pm_runtime_use_autosuspend(struct device *dev, bool use) | |
1169 | { | |
1170 | int old_delay, old_use; | |
1171 | ||
1172 | spin_lock_irq(&dev->power.lock); | |
1173 | old_delay = dev->power.autosuspend_delay; | |
1174 | old_use = dev->power.use_autosuspend; | |
1175 | dev->power.use_autosuspend = use; | |
1176 | update_autosuspend(dev, old_delay, old_use); | |
1177 | spin_unlock_irq(&dev->power.lock); | |
1178 | } | |
1179 | EXPORT_SYMBOL_GPL(__pm_runtime_use_autosuspend); | |
1180 | ||
5e928f77 RW |
1181 | /** |
1182 | * pm_runtime_init - Initialize run-time PM fields in given device object. | |
1183 | * @dev: Device object to initialize. | |
1184 | */ | |
1185 | void pm_runtime_init(struct device *dev) | |
1186 | { | |
5e928f77 RW |
1187 | dev->power.runtime_status = RPM_SUSPENDED; |
1188 | dev->power.idle_notification = false; | |
1189 | ||
1190 | dev->power.disable_depth = 1; | |
1191 | atomic_set(&dev->power.usage_count, 0); | |
1192 | ||
1193 | dev->power.runtime_error = 0; | |
1194 | ||
1195 | atomic_set(&dev->power.child_count, 0); | |
1196 | pm_suspend_ignore_children(dev, false); | |
53823639 | 1197 | dev->power.runtime_auto = true; |
5e928f77 RW |
1198 | |
1199 | dev->power.request_pending = false; | |
1200 | dev->power.request = RPM_REQ_NONE; | |
1201 | dev->power.deferred_resume = false; | |
8d4b9d1b | 1202 | dev->power.accounting_timestamp = jiffies; |
5e928f77 RW |
1203 | INIT_WORK(&dev->power.work, pm_runtime_work); |
1204 | ||
1205 | dev->power.timer_expires = 0; | |
1206 | setup_timer(&dev->power.suspend_timer, pm_suspend_timer_fn, | |
1207 | (unsigned long)dev); | |
1208 | ||
1209 | init_waitqueue_head(&dev->power.wait_queue); | |
1210 | } | |
1211 | ||
1212 | /** | |
1213 | * pm_runtime_remove - Prepare for removing a device from device hierarchy. | |
1214 | * @dev: Device object being removed from device hierarchy. | |
1215 | */ | |
1216 | void pm_runtime_remove(struct device *dev) | |
1217 | { | |
1218 | __pm_runtime_disable(dev, false); | |
1219 | ||
1220 | /* Change the status back to 'suspended' to match the initial status. */ | |
1221 | if (dev->power.runtime_status == RPM_ACTIVE) | |
1222 | pm_runtime_set_suspended(dev); | |
1223 | } |