Commit | Line | Data |
---|---|---|
5e928f77 | 1 | /* |
62052ab1 | 2 | * drivers/base/power/runtime.c - Helper functions for device runtime PM |
5e928f77 RW |
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> | |
1b6bc32f | 11 | #include <linux/export.h> |
5e928f77 | 12 | #include <linux/pm_runtime.h> |
c3dc2f14 | 13 | #include <trace/events/rpm.h> |
7490e442 | 14 | #include "power.h" |
5e928f77 | 15 | |
5f59df79 UH |
16 | #define RPM_GET_CALLBACK(dev, cb) \ |
17 | ({ \ | |
18 | int (*__rpm_cb)(struct device *__d); \ | |
19 | \ | |
20 | if (dev->pm_domain) \ | |
21 | __rpm_cb = dev->pm_domain->ops.cb; \ | |
22 | else if (dev->type && dev->type->pm) \ | |
23 | __rpm_cb = dev->type->pm->cb; \ | |
24 | else if (dev->class && dev->class->pm) \ | |
25 | __rpm_cb = dev->class->pm->cb; \ | |
26 | else if (dev->bus && dev->bus->pm) \ | |
27 | __rpm_cb = dev->bus->pm->cb; \ | |
28 | else \ | |
29 | __rpm_cb = NULL; \ | |
30 | \ | |
31 | if (!__rpm_cb && dev->driver && dev->driver->pm) \ | |
32 | __rpm_cb = dev->driver->pm->cb; \ | |
33 | \ | |
34 | __rpm_cb; \ | |
35 | }) | |
36 | ||
37 | static int (*rpm_get_suspend_cb(struct device *dev))(struct device *) | |
38 | { | |
39 | return RPM_GET_CALLBACK(dev, runtime_suspend); | |
40 | } | |
41 | ||
42 | static int (*rpm_get_resume_cb(struct device *dev))(struct device *) | |
43 | { | |
44 | return RPM_GET_CALLBACK(dev, runtime_resume); | |
45 | } | |
46 | ||
37f20416 | 47 | #ifdef CONFIG_PM_RUNTIME |
5f59df79 UH |
48 | static int (*rpm_get_idle_cb(struct device *dev))(struct device *) |
49 | { | |
50 | return RPM_GET_CALLBACK(dev, runtime_idle); | |
51 | } | |
52 | ||
140a6c94 | 53 | static int rpm_resume(struct device *dev, int rpmflags); |
7490e442 | 54 | static int rpm_suspend(struct device *dev, int rpmflags); |
5e928f77 | 55 | |
4769373c AS |
56 | /** |
57 | * update_pm_runtime_accounting - Update the time accounting of power states | |
58 | * @dev: Device to update the accounting for | |
59 | * | |
60 | * In order to be able to have time accounting of the various power states | |
61 | * (as used by programs such as PowerTOP to show the effectiveness of runtime | |
62 | * PM), we need to track the time spent in each state. | |
63 | * update_pm_runtime_accounting must be called each time before the | |
64 | * runtime_status field is updated, to account the time in the old state | |
65 | * correctly. | |
66 | */ | |
67 | void update_pm_runtime_accounting(struct device *dev) | |
68 | { | |
69 | unsigned long now = jiffies; | |
def0c0a3 | 70 | unsigned long delta; |
4769373c AS |
71 | |
72 | delta = now - dev->power.accounting_timestamp; | |
73 | ||
4769373c AS |
74 | dev->power.accounting_timestamp = now; |
75 | ||
76 | if (dev->power.disable_depth > 0) | |
77 | return; | |
78 | ||
79 | if (dev->power.runtime_status == RPM_SUSPENDED) | |
80 | dev->power.suspended_jiffies += delta; | |
81 | else | |
82 | dev->power.active_jiffies += delta; | |
83 | } | |
84 | ||
85 | static void __update_runtime_status(struct device *dev, enum rpm_status status) | |
86 | { | |
87 | update_pm_runtime_accounting(dev); | |
88 | dev->power.runtime_status = status; | |
89 | } | |
90 | ||
5e928f77 RW |
91 | /** |
92 | * pm_runtime_deactivate_timer - Deactivate given device's suspend timer. | |
93 | * @dev: Device to handle. | |
94 | */ | |
95 | static void pm_runtime_deactivate_timer(struct device *dev) | |
96 | { | |
97 | if (dev->power.timer_expires > 0) { | |
98 | del_timer(&dev->power.suspend_timer); | |
99 | dev->power.timer_expires = 0; | |
100 | } | |
101 | } | |
102 | ||
103 | /** | |
104 | * pm_runtime_cancel_pending - Deactivate suspend timer and cancel requests. | |
105 | * @dev: Device to handle. | |
106 | */ | |
107 | static void pm_runtime_cancel_pending(struct device *dev) | |
108 | { | |
109 | pm_runtime_deactivate_timer(dev); | |
110 | /* | |
111 | * In case there's a request pending, make sure its work function will | |
112 | * return without doing anything. | |
113 | */ | |
114 | dev->power.request = RPM_REQ_NONE; | |
115 | } | |
116 | ||
15bcb91d AS |
117 | /* |
118 | * pm_runtime_autosuspend_expiration - Get a device's autosuspend-delay expiration time. | |
119 | * @dev: Device to handle. | |
120 | * | |
121 | * Compute the autosuspend-delay expiration time based on the device's | |
122 | * power.last_busy time. If the delay has already expired or is disabled | |
123 | * (negative) or the power.use_autosuspend flag isn't set, return 0. | |
124 | * Otherwise return the expiration time in jiffies (adjusted to be nonzero). | |
125 | * | |
126 | * This function may be called either with or without dev->power.lock held. | |
127 | * Either way it can be racy, since power.last_busy may be updated at any time. | |
128 | */ | |
129 | unsigned long pm_runtime_autosuspend_expiration(struct device *dev) | |
130 | { | |
131 | int autosuspend_delay; | |
132 | long elapsed; | |
133 | unsigned long last_busy; | |
134 | unsigned long expires = 0; | |
135 | ||
136 | if (!dev->power.use_autosuspend) | |
137 | goto out; | |
138 | ||
139 | autosuspend_delay = ACCESS_ONCE(dev->power.autosuspend_delay); | |
140 | if (autosuspend_delay < 0) | |
141 | goto out; | |
142 | ||
143 | last_busy = ACCESS_ONCE(dev->power.last_busy); | |
144 | elapsed = jiffies - last_busy; | |
145 | if (elapsed < 0) | |
146 | goto out; /* jiffies has wrapped around. */ | |
147 | ||
148 | /* | |
149 | * If the autosuspend_delay is >= 1 second, align the timer by rounding | |
150 | * up to the nearest second. | |
151 | */ | |
152 | expires = last_busy + msecs_to_jiffies(autosuspend_delay); | |
153 | if (autosuspend_delay >= 1000) | |
154 | expires = round_jiffies(expires); | |
155 | expires += !expires; | |
156 | if (elapsed >= expires - last_busy) | |
157 | expires = 0; /* Already expired. */ | |
158 | ||
159 | out: | |
160 | return expires; | |
161 | } | |
162 | EXPORT_SYMBOL_GPL(pm_runtime_autosuspend_expiration); | |
163 | ||
e823407f ML |
164 | static int dev_memalloc_noio(struct device *dev, void *data) |
165 | { | |
166 | return dev->power.memalloc_noio; | |
167 | } | |
168 | ||
169 | /* | |
170 | * pm_runtime_set_memalloc_noio - Set a device's memalloc_noio flag. | |
171 | * @dev: Device to handle. | |
172 | * @enable: True for setting the flag and False for clearing the flag. | |
173 | * | |
174 | * Set the flag for all devices in the path from the device to the | |
175 | * root device in the device tree if @enable is true, otherwise clear | |
176 | * the flag for devices in the path whose siblings don't set the flag. | |
177 | * | |
178 | * The function should only be called by block device, or network | |
179 | * device driver for solving the deadlock problem during runtime | |
180 | * resume/suspend: | |
181 | * | |
182 | * If memory allocation with GFP_KERNEL is called inside runtime | |
183 | * resume/suspend callback of any one of its ancestors(or the | |
184 | * block device itself), the deadlock may be triggered inside the | |
185 | * memory allocation since it might not complete until the block | |
186 | * device becomes active and the involed page I/O finishes. The | |
187 | * situation is pointed out first by Alan Stern. Network device | |
188 | * are involved in iSCSI kind of situation. | |
189 | * | |
190 | * The lock of dev_hotplug_mutex is held in the function for handling | |
191 | * hotplug race because pm_runtime_set_memalloc_noio() may be called | |
192 | * in async probe(). | |
193 | * | |
194 | * The function should be called between device_add() and device_del() | |
195 | * on the affected device(block/network device). | |
196 | */ | |
197 | void pm_runtime_set_memalloc_noio(struct device *dev, bool enable) | |
198 | { | |
199 | static DEFINE_MUTEX(dev_hotplug_mutex); | |
200 | ||
201 | mutex_lock(&dev_hotplug_mutex); | |
202 | for (;;) { | |
203 | bool enabled; | |
204 | ||
205 | /* hold power lock since bitfield is not SMP-safe. */ | |
206 | spin_lock_irq(&dev->power.lock); | |
207 | enabled = dev->power.memalloc_noio; | |
208 | dev->power.memalloc_noio = enable; | |
209 | spin_unlock_irq(&dev->power.lock); | |
210 | ||
211 | /* | |
212 | * not need to enable ancestors any more if the device | |
213 | * has been enabled. | |
214 | */ | |
215 | if (enabled && enable) | |
216 | break; | |
217 | ||
218 | dev = dev->parent; | |
219 | ||
220 | /* | |
221 | * clear flag of the parent device only if all the | |
222 | * children don't set the flag because ancestor's | |
223 | * flag was set by any one of the descendants. | |
224 | */ | |
225 | if (!dev || (!enable && | |
226 | device_for_each_child(dev, NULL, | |
227 | dev_memalloc_noio))) | |
228 | break; | |
229 | } | |
230 | mutex_unlock(&dev_hotplug_mutex); | |
231 | } | |
232 | EXPORT_SYMBOL_GPL(pm_runtime_set_memalloc_noio); | |
233 | ||
5e928f77 | 234 | /** |
1bfee5bc AS |
235 | * rpm_check_suspend_allowed - Test whether a device may be suspended. |
236 | * @dev: Device to test. | |
5e928f77 | 237 | */ |
1bfee5bc | 238 | static int rpm_check_suspend_allowed(struct device *dev) |
5e928f77 RW |
239 | { |
240 | int retval = 0; | |
241 | ||
5e928f77 RW |
242 | if (dev->power.runtime_error) |
243 | retval = -EINVAL; | |
632e270e RW |
244 | else if (dev->power.disable_depth > 0) |
245 | retval = -EACCES; | |
246 | else if (atomic_read(&dev->power.usage_count) > 0) | |
5e928f77 RW |
247 | retval = -EAGAIN; |
248 | else if (!pm_children_suspended(dev)) | |
249 | retval = -EBUSY; | |
1bfee5bc AS |
250 | |
251 | /* Pending resume requests take precedence over suspends. */ | |
252 | else if ((dev->power.deferred_resume | |
78ca7c37 | 253 | && dev->power.runtime_status == RPM_SUSPENDING) |
1bfee5bc AS |
254 | || (dev->power.request_pending |
255 | && dev->power.request == RPM_REQ_RESUME)) | |
256 | retval = -EAGAIN; | |
55d7ec45 RW |
257 | else if (__dev_pm_qos_read_value(dev) < 0) |
258 | retval = -EPERM; | |
1bfee5bc AS |
259 | else if (dev->power.runtime_status == RPM_SUSPENDED) |
260 | retval = 1; | |
261 | ||
262 | return retval; | |
263 | } | |
264 | ||
ad3c36a5 RW |
265 | /** |
266 | * __rpm_callback - Run a given runtime PM callback for a given device. | |
267 | * @cb: Runtime PM callback to run. | |
268 | * @dev: Device to run the callback for. | |
269 | */ | |
270 | static int __rpm_callback(int (*cb)(struct device *), struct device *dev) | |
271 | __releases(&dev->power.lock) __acquires(&dev->power.lock) | |
272 | { | |
273 | int retval; | |
274 | ||
275 | if (dev->power.irq_safe) | |
276 | spin_unlock(&dev->power.lock); | |
277 | else | |
278 | spin_unlock_irq(&dev->power.lock); | |
279 | ||
280 | retval = cb(dev); | |
281 | ||
282 | if (dev->power.irq_safe) | |
283 | spin_lock(&dev->power.lock); | |
284 | else | |
285 | spin_lock_irq(&dev->power.lock); | |
286 | ||
287 | return retval; | |
288 | } | |
289 | ||
1bfee5bc | 290 | /** |
140a6c94 | 291 | * rpm_idle - Notify device bus type if the device can be suspended. |
1bfee5bc AS |
292 | * @dev: Device to notify the bus type about. |
293 | * @rpmflags: Flag bits. | |
294 | * | |
62052ab1 | 295 | * Check if the device's runtime PM status allows it to be suspended. If |
1bfee5bc AS |
296 | * another idle notification has been started earlier, return immediately. If |
297 | * the RPM_ASYNC flag is set then queue an idle-notification request; otherwise | |
d66e6db2 UH |
298 | * run the ->runtime_idle() callback directly. If the ->runtime_idle callback |
299 | * doesn't exist or if it returns 0, call rpm_suspend with the RPM_AUTO flag. | |
1bfee5bc AS |
300 | * |
301 | * This function must be called under dev->power.lock with interrupts disabled. | |
302 | */ | |
140a6c94 | 303 | static int rpm_idle(struct device *dev, int rpmflags) |
1bfee5bc | 304 | { |
71c63122 | 305 | int (*callback)(struct device *); |
1bfee5bc AS |
306 | int retval; |
307 | ||
c3dc2f14 | 308 | trace_rpm_idle(dev, rpmflags); |
1bfee5bc AS |
309 | retval = rpm_check_suspend_allowed(dev); |
310 | if (retval < 0) | |
311 | ; /* Conditions are wrong. */ | |
312 | ||
313 | /* Idle notifications are allowed only in the RPM_ACTIVE state. */ | |
314 | else if (dev->power.runtime_status != RPM_ACTIVE) | |
315 | retval = -EAGAIN; | |
316 | ||
317 | /* | |
318 | * Any pending request other than an idle notification takes | |
319 | * precedence over us, except that the timer may be running. | |
320 | */ | |
321 | else if (dev->power.request_pending && | |
322 | dev->power.request > RPM_REQ_IDLE) | |
323 | retval = -EAGAIN; | |
324 | ||
325 | /* Act as though RPM_NOWAIT is always set. */ | |
326 | else if (dev->power.idle_notification) | |
327 | retval = -EINPROGRESS; | |
5e928f77 RW |
328 | if (retval) |
329 | goto out; | |
330 | ||
1bfee5bc AS |
331 | /* Pending requests need to be canceled. */ |
332 | dev->power.request = RPM_REQ_NONE; | |
333 | ||
45f0a85c | 334 | if (dev->power.no_callbacks) |
7490e442 | 335 | goto out; |
7490e442 | 336 | |
1bfee5bc AS |
337 | /* Carry out an asynchronous or a synchronous idle notification. */ |
338 | if (rpmflags & RPM_ASYNC) { | |
339 | dev->power.request = RPM_REQ_IDLE; | |
340 | if (!dev->power.request_pending) { | |
341 | dev->power.request_pending = true; | |
342 | queue_work(pm_wq, &dev->power.work); | |
5e928f77 | 343 | } |
45f0a85c RW |
344 | trace_rpm_return_int(dev, _THIS_IP_, 0); |
345 | return 0; | |
5e928f77 RW |
346 | } |
347 | ||
348 | dev->power.idle_notification = true; | |
349 | ||
5f59df79 | 350 | callback = rpm_get_idle_cb(dev); |
35cd133c | 351 | |
ad3c36a5 | 352 | if (callback) |
45f0a85c | 353 | retval = __rpm_callback(callback, dev); |
5e928f77 RW |
354 | |
355 | dev->power.idle_notification = false; | |
356 | wake_up_all(&dev->power.wait_queue); | |
357 | ||
358 | out: | |
c3dc2f14 | 359 | trace_rpm_return_int(dev, _THIS_IP_, retval); |
d66e6db2 | 360 | return retval ? retval : rpm_suspend(dev, rpmflags | RPM_AUTO); |
5e928f77 RW |
361 | } |
362 | ||
71c63122 RW |
363 | /** |
364 | * rpm_callback - Run a given runtime PM callback for a given device. | |
365 | * @cb: Runtime PM callback to run. | |
366 | * @dev: Device to run the callback for. | |
367 | */ | |
368 | static int rpm_callback(int (*cb)(struct device *), struct device *dev) | |
71c63122 RW |
369 | { |
370 | int retval; | |
371 | ||
372 | if (!cb) | |
373 | return -ENOSYS; | |
374 | ||
db88175f ML |
375 | if (dev->power.memalloc_noio) { |
376 | unsigned int noio_flag; | |
377 | ||
378 | /* | |
379 | * Deadlock might be caused if memory allocation with | |
380 | * GFP_KERNEL happens inside runtime_suspend and | |
381 | * runtime_resume callbacks of one block device's | |
382 | * ancestor or the block device itself. Network | |
383 | * device might be thought as part of iSCSI block | |
384 | * device, so network device and its ancestor should | |
385 | * be marked as memalloc_noio too. | |
386 | */ | |
387 | noio_flag = memalloc_noio_save(); | |
388 | retval = __rpm_callback(cb, dev); | |
389 | memalloc_noio_restore(noio_flag); | |
390 | } else { | |
391 | retval = __rpm_callback(cb, dev); | |
392 | } | |
71c63122 | 393 | |
71c63122 | 394 | dev->power.runtime_error = retval; |
632e270e | 395 | return retval != -EACCES ? retval : -EIO; |
71c63122 RW |
396 | } |
397 | ||
5e928f77 | 398 | /** |
62052ab1 | 399 | * rpm_suspend - Carry out runtime suspend of given device. |
5e928f77 | 400 | * @dev: Device to suspend. |
3f9af051 | 401 | * @rpmflags: Flag bits. |
5e928f77 | 402 | * |
47d8f0ba ML |
403 | * Check if the device's runtime PM status allows it to be suspended. |
404 | * Cancel a pending idle notification, autosuspend or suspend. If | |
405 | * another suspend has been started earlier, either return immediately | |
406 | * or wait for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC | |
407 | * flags. If the RPM_ASYNC flag is set then queue a suspend request; | |
857b36c7 ML |
408 | * otherwise run the ->runtime_suspend() callback directly. When |
409 | * ->runtime_suspend succeeded, if a deferred resume was requested while | |
410 | * the callback was running then carry it out, otherwise send an idle | |
411 | * notification for its parent (if the suspend succeeded and both | |
412 | * ignore_children of parent->power and irq_safe of dev->power are not set). | |
886486b7 AS |
413 | * If ->runtime_suspend failed with -EAGAIN or -EBUSY, and if the RPM_AUTO |
414 | * flag is set and the next autosuspend-delay expiration time is in the | |
415 | * future, schedule another autosuspend attempt. | |
5e928f77 RW |
416 | * |
417 | * This function must be called under dev->power.lock with interrupts disabled. | |
418 | */ | |
140a6c94 | 419 | static int rpm_suspend(struct device *dev, int rpmflags) |
5e928f77 RW |
420 | __releases(&dev->power.lock) __acquires(&dev->power.lock) |
421 | { | |
71c63122 | 422 | int (*callback)(struct device *); |
5e928f77 | 423 | struct device *parent = NULL; |
1bfee5bc | 424 | int retval; |
5e928f77 | 425 | |
c3dc2f14 | 426 | trace_rpm_suspend(dev, rpmflags); |
5e928f77 RW |
427 | |
428 | repeat: | |
1bfee5bc | 429 | retval = rpm_check_suspend_allowed(dev); |
5e928f77 | 430 | |
1bfee5bc AS |
431 | if (retval < 0) |
432 | ; /* Conditions are wrong. */ | |
433 | ||
434 | /* Synchronous suspends are not allowed in the RPM_RESUMING state. */ | |
435 | else if (dev->power.runtime_status == RPM_RESUMING && | |
436 | !(rpmflags & RPM_ASYNC)) | |
5e928f77 | 437 | retval = -EAGAIN; |
1bfee5bc | 438 | if (retval) |
5e928f77 | 439 | goto out; |
5e928f77 | 440 | |
15bcb91d AS |
441 | /* If the autosuspend_delay time hasn't expired yet, reschedule. */ |
442 | if ((rpmflags & RPM_AUTO) | |
443 | && dev->power.runtime_status != RPM_SUSPENDING) { | |
444 | unsigned long expires = pm_runtime_autosuspend_expiration(dev); | |
445 | ||
446 | if (expires != 0) { | |
447 | /* Pending requests need to be canceled. */ | |
448 | dev->power.request = RPM_REQ_NONE; | |
449 | ||
450 | /* | |
451 | * Optimization: If the timer is already running and is | |
452 | * set to expire at or before the autosuspend delay, | |
453 | * avoid the overhead of resetting it. Just let it | |
454 | * expire; pm_suspend_timer_fn() will take care of the | |
455 | * rest. | |
456 | */ | |
457 | if (!(dev->power.timer_expires && time_before_eq( | |
458 | dev->power.timer_expires, expires))) { | |
459 | dev->power.timer_expires = expires; | |
460 | mod_timer(&dev->power.suspend_timer, expires); | |
461 | } | |
462 | dev->power.timer_autosuspends = 1; | |
463 | goto out; | |
464 | } | |
465 | } | |
466 | ||
5e928f77 RW |
467 | /* Other scheduled or pending requests need to be canceled. */ |
468 | pm_runtime_cancel_pending(dev); | |
469 | ||
5e928f77 RW |
470 | if (dev->power.runtime_status == RPM_SUSPENDING) { |
471 | DEFINE_WAIT(wait); | |
472 | ||
1bfee5bc | 473 | if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) { |
5e928f77 RW |
474 | retval = -EINPROGRESS; |
475 | goto out; | |
476 | } | |
477 | ||
ad3c36a5 RW |
478 | if (dev->power.irq_safe) { |
479 | spin_unlock(&dev->power.lock); | |
480 | ||
481 | cpu_relax(); | |
482 | ||
483 | spin_lock(&dev->power.lock); | |
484 | goto repeat; | |
485 | } | |
486 | ||
5e928f77 RW |
487 | /* Wait for the other suspend running in parallel with us. */ |
488 | for (;;) { | |
489 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
490 | TASK_UNINTERRUPTIBLE); | |
491 | if (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 | if (dev->power.no_callbacks) |
505 | goto no_callback; /* Assume success. */ | |
506 | ||
1bfee5bc AS |
507 | /* Carry out an asynchronous or a synchronous suspend. */ |
508 | if (rpmflags & RPM_ASYNC) { | |
15bcb91d AS |
509 | dev->power.request = (rpmflags & RPM_AUTO) ? |
510 | RPM_REQ_AUTOSUSPEND : RPM_REQ_SUSPEND; | |
1bfee5bc AS |
511 | if (!dev->power.request_pending) { |
512 | dev->power.request_pending = true; | |
513 | queue_work(pm_wq, &dev->power.work); | |
514 | } | |
515 | goto out; | |
516 | } | |
517 | ||
8d4b9d1b | 518 | __update_runtime_status(dev, RPM_SUSPENDING); |
5e928f77 | 519 | |
5f59df79 | 520 | callback = rpm_get_suspend_cb(dev); |
35cd133c | 521 | |
71c63122 | 522 | retval = rpm_callback(callback, dev); |
00dc9ad1 RW |
523 | if (retval) |
524 | goto fail; | |
886486b7 | 525 | |
7490e442 | 526 | no_callback: |
857b36c7 ML |
527 | __update_runtime_status(dev, RPM_SUSPENDED); |
528 | pm_runtime_deactivate_timer(dev); | |
5e928f77 | 529 | |
857b36c7 ML |
530 | if (dev->parent) { |
531 | parent = dev->parent; | |
532 | atomic_add_unless(&parent->power.child_count, -1, 0); | |
5e928f77 RW |
533 | } |
534 | wake_up_all(&dev->power.wait_queue); | |
535 | ||
536 | if (dev->power.deferred_resume) { | |
58a34de7 | 537 | dev->power.deferred_resume = false; |
140a6c94 | 538 | rpm_resume(dev, 0); |
5e928f77 RW |
539 | retval = -EAGAIN; |
540 | goto out; | |
541 | } | |
542 | ||
c3810c88 | 543 | /* Maybe the parent is now able to suspend. */ |
c7b61de5 | 544 | if (parent && !parent->power.ignore_children && !dev->power.irq_safe) { |
c3810c88 | 545 | spin_unlock(&dev->power.lock); |
5e928f77 | 546 | |
c3810c88 AS |
547 | spin_lock(&parent->power.lock); |
548 | rpm_idle(parent, RPM_ASYNC); | |
549 | spin_unlock(&parent->power.lock); | |
5e928f77 | 550 | |
c3810c88 | 551 | spin_lock(&dev->power.lock); |
5e928f77 RW |
552 | } |
553 | ||
554 | out: | |
c3dc2f14 | 555 | trace_rpm_return_int(dev, _THIS_IP_, retval); |
5e928f77 RW |
556 | |
557 | return retval; | |
00dc9ad1 RW |
558 | |
559 | fail: | |
560 | __update_runtime_status(dev, RPM_ACTIVE); | |
00dc9ad1 | 561 | dev->power.deferred_resume = false; |
f2791d73 AS |
562 | wake_up_all(&dev->power.wait_queue); |
563 | ||
00dc9ad1 RW |
564 | if (retval == -EAGAIN || retval == -EBUSY) { |
565 | dev->power.runtime_error = 0; | |
566 | ||
567 | /* | |
568 | * If the callback routine failed an autosuspend, and | |
569 | * if the last_busy time has been updated so that there | |
570 | * is a new autosuspend expiration time, automatically | |
571 | * reschedule another autosuspend. | |
572 | */ | |
573 | if ((rpmflags & RPM_AUTO) && | |
574 | pm_runtime_autosuspend_expiration(dev) != 0) | |
575 | goto repeat; | |
576 | } else { | |
577 | pm_runtime_cancel_pending(dev); | |
578 | } | |
00dc9ad1 | 579 | goto out; |
5e928f77 RW |
580 | } |
581 | ||
582 | /** | |
62052ab1 | 583 | * rpm_resume - Carry out runtime resume of given device. |
5e928f77 | 584 | * @dev: Device to resume. |
3f9af051 | 585 | * @rpmflags: Flag bits. |
5e928f77 | 586 | * |
62052ab1 | 587 | * Check if the device's runtime PM status allows it to be resumed. Cancel |
1bfee5bc | 588 | * any scheduled or pending requests. If another resume has been started |
25985edc | 589 | * earlier, either return immediately or wait for it to finish, depending on the |
1bfee5bc AS |
590 | * RPM_NOWAIT and RPM_ASYNC flags. Similarly, if there's a suspend running in |
591 | * parallel with this function, either tell the other process to resume after | |
592 | * suspending (deferred_resume) or wait for it to finish. If the RPM_ASYNC | |
593 | * flag is set then queue a resume request; otherwise run the | |
594 | * ->runtime_resume() callback directly. Queue an idle notification for the | |
595 | * device if the resume succeeded. | |
5e928f77 RW |
596 | * |
597 | * This function must be called under dev->power.lock with interrupts disabled. | |
598 | */ | |
140a6c94 | 599 | static int rpm_resume(struct device *dev, int rpmflags) |
5e928f77 RW |
600 | __releases(&dev->power.lock) __acquires(&dev->power.lock) |
601 | { | |
71c63122 | 602 | int (*callback)(struct device *); |
5e928f77 RW |
603 | struct device *parent = NULL; |
604 | int retval = 0; | |
605 | ||
c3dc2f14 | 606 | trace_rpm_resume(dev, rpmflags); |
5e928f77 RW |
607 | |
608 | repeat: | |
1bfee5bc | 609 | if (dev->power.runtime_error) |
5e928f77 | 610 | retval = -EINVAL; |
6f3c77b0 KH |
611 | else if (dev->power.disable_depth == 1 && dev->power.is_suspended |
612 | && dev->power.runtime_status == RPM_ACTIVE) | |
613 | retval = 1; | |
1bfee5bc | 614 | else if (dev->power.disable_depth > 0) |
632e270e | 615 | retval = -EACCES; |
1bfee5bc | 616 | if (retval) |
5e928f77 | 617 | goto out; |
5e928f77 | 618 | |
15bcb91d AS |
619 | /* |
620 | * Other scheduled or pending requests need to be canceled. Small | |
621 | * optimization: If an autosuspend timer is running, leave it running | |
622 | * rather than cancelling it now only to restart it again in the near | |
623 | * future. | |
624 | */ | |
625 | dev->power.request = RPM_REQ_NONE; | |
626 | if (!dev->power.timer_autosuspends) | |
627 | pm_runtime_deactivate_timer(dev); | |
5e928f77 | 628 | |
1bfee5bc | 629 | if (dev->power.runtime_status == RPM_ACTIVE) { |
5e928f77 | 630 | retval = 1; |
5e928f77 | 631 | goto out; |
1bfee5bc | 632 | } |
5e928f77 RW |
633 | |
634 | if (dev->power.runtime_status == RPM_RESUMING | |
635 | || dev->power.runtime_status == RPM_SUSPENDING) { | |
636 | DEFINE_WAIT(wait); | |
637 | ||
1bfee5bc | 638 | if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) { |
5e928f77 RW |
639 | if (dev->power.runtime_status == RPM_SUSPENDING) |
640 | dev->power.deferred_resume = true; | |
1bfee5bc AS |
641 | else |
642 | retval = -EINPROGRESS; | |
5e928f77 RW |
643 | goto out; |
644 | } | |
645 | ||
ad3c36a5 RW |
646 | if (dev->power.irq_safe) { |
647 | spin_unlock(&dev->power.lock); | |
648 | ||
649 | cpu_relax(); | |
650 | ||
651 | spin_lock(&dev->power.lock); | |
652 | goto repeat; | |
653 | } | |
654 | ||
5e928f77 RW |
655 | /* Wait for the operation carried out in parallel with us. */ |
656 | for (;;) { | |
657 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
658 | TASK_UNINTERRUPTIBLE); | |
659 | if (dev->power.runtime_status != RPM_RESUMING | |
660 | && dev->power.runtime_status != RPM_SUSPENDING) | |
661 | break; | |
662 | ||
663 | spin_unlock_irq(&dev->power.lock); | |
664 | ||
665 | schedule(); | |
666 | ||
667 | spin_lock_irq(&dev->power.lock); | |
668 | } | |
669 | finish_wait(&dev->power.wait_queue, &wait); | |
670 | goto repeat; | |
671 | } | |
672 | ||
7490e442 AS |
673 | /* |
674 | * See if we can skip waking up the parent. This is safe only if | |
675 | * power.no_callbacks is set, because otherwise we don't know whether | |
676 | * the resume will actually succeed. | |
677 | */ | |
678 | if (dev->power.no_callbacks && !parent && dev->parent) { | |
d63be5f9 | 679 | spin_lock_nested(&dev->parent->power.lock, SINGLE_DEPTH_NESTING); |
7490e442 AS |
680 | if (dev->parent->power.disable_depth > 0 |
681 | || dev->parent->power.ignore_children | |
682 | || dev->parent->power.runtime_status == RPM_ACTIVE) { | |
683 | atomic_inc(&dev->parent->power.child_count); | |
684 | spin_unlock(&dev->parent->power.lock); | |
7f321c26 | 685 | retval = 1; |
7490e442 AS |
686 | goto no_callback; /* Assume success. */ |
687 | } | |
688 | spin_unlock(&dev->parent->power.lock); | |
689 | } | |
690 | ||
1bfee5bc AS |
691 | /* Carry out an asynchronous or a synchronous resume. */ |
692 | if (rpmflags & RPM_ASYNC) { | |
693 | dev->power.request = RPM_REQ_RESUME; | |
694 | if (!dev->power.request_pending) { | |
695 | dev->power.request_pending = true; | |
696 | queue_work(pm_wq, &dev->power.work); | |
697 | } | |
698 | retval = 0; | |
699 | goto out; | |
700 | } | |
701 | ||
5e928f77 RW |
702 | if (!parent && dev->parent) { |
703 | /* | |
c7b61de5 AS |
704 | * Increment the parent's usage counter and resume it if |
705 | * necessary. Not needed if dev is irq-safe; then the | |
706 | * parent is permanently resumed. | |
5e928f77 RW |
707 | */ |
708 | parent = dev->parent; | |
c7b61de5 AS |
709 | if (dev->power.irq_safe) |
710 | goto skip_parent; | |
862f89b3 | 711 | spin_unlock(&dev->power.lock); |
5e928f77 RW |
712 | |
713 | pm_runtime_get_noresume(parent); | |
714 | ||
862f89b3 | 715 | spin_lock(&parent->power.lock); |
5e928f77 | 716 | /* |
62052ab1 | 717 | * We can resume if the parent's runtime PM is disabled or it |
5e928f77 RW |
718 | * is set to ignore children. |
719 | */ | |
720 | if (!parent->power.disable_depth | |
721 | && !parent->power.ignore_children) { | |
140a6c94 | 722 | rpm_resume(parent, 0); |
5e928f77 RW |
723 | if (parent->power.runtime_status != RPM_ACTIVE) |
724 | retval = -EBUSY; | |
725 | } | |
862f89b3 | 726 | spin_unlock(&parent->power.lock); |
5e928f77 | 727 | |
862f89b3 | 728 | spin_lock(&dev->power.lock); |
5e928f77 RW |
729 | if (retval) |
730 | goto out; | |
731 | goto repeat; | |
732 | } | |
c7b61de5 | 733 | skip_parent: |
5e928f77 | 734 | |
7490e442 AS |
735 | if (dev->power.no_callbacks) |
736 | goto no_callback; /* Assume success. */ | |
737 | ||
8d4b9d1b | 738 | __update_runtime_status(dev, RPM_RESUMING); |
5e928f77 | 739 | |
5f59df79 | 740 | callback = rpm_get_resume_cb(dev); |
35cd133c | 741 | |
71c63122 | 742 | retval = rpm_callback(callback, dev); |
5e928f77 | 743 | if (retval) { |
8d4b9d1b | 744 | __update_runtime_status(dev, RPM_SUSPENDED); |
5e928f77 RW |
745 | pm_runtime_cancel_pending(dev); |
746 | } else { | |
7490e442 | 747 | no_callback: |
8d4b9d1b | 748 | __update_runtime_status(dev, RPM_ACTIVE); |
5e928f77 RW |
749 | if (parent) |
750 | atomic_inc(&parent->power.child_count); | |
751 | } | |
752 | wake_up_all(&dev->power.wait_queue); | |
753 | ||
7f321c26 | 754 | if (retval >= 0) |
140a6c94 | 755 | rpm_idle(dev, RPM_ASYNC); |
5e928f77 RW |
756 | |
757 | out: | |
c7b61de5 | 758 | if (parent && !dev->power.irq_safe) { |
5e928f77 RW |
759 | spin_unlock_irq(&dev->power.lock); |
760 | ||
761 | pm_runtime_put(parent); | |
762 | ||
763 | spin_lock_irq(&dev->power.lock); | |
764 | } | |
765 | ||
c3dc2f14 | 766 | trace_rpm_return_int(dev, _THIS_IP_, retval); |
5e928f77 RW |
767 | |
768 | return retval; | |
769 | } | |
770 | ||
5e928f77 | 771 | /** |
62052ab1 | 772 | * pm_runtime_work - Universal runtime PM work function. |
5e928f77 RW |
773 | * @work: Work structure used for scheduling the execution of this function. |
774 | * | |
775 | * Use @work to get the device object the work is to be done for, determine what | |
62052ab1 | 776 | * is to be done and execute the appropriate runtime PM function. |
5e928f77 RW |
777 | */ |
778 | static void pm_runtime_work(struct work_struct *work) | |
779 | { | |
780 | struct device *dev = container_of(work, struct device, power.work); | |
781 | enum rpm_request req; | |
782 | ||
783 | spin_lock_irq(&dev->power.lock); | |
784 | ||
785 | if (!dev->power.request_pending) | |
786 | goto out; | |
787 | ||
788 | req = dev->power.request; | |
789 | dev->power.request = RPM_REQ_NONE; | |
790 | dev->power.request_pending = false; | |
791 | ||
792 | switch (req) { | |
793 | case RPM_REQ_NONE: | |
794 | break; | |
795 | case RPM_REQ_IDLE: | |
140a6c94 | 796 | rpm_idle(dev, RPM_NOWAIT); |
5e928f77 RW |
797 | break; |
798 | case RPM_REQ_SUSPEND: | |
140a6c94 | 799 | rpm_suspend(dev, RPM_NOWAIT); |
5e928f77 | 800 | break; |
15bcb91d AS |
801 | case RPM_REQ_AUTOSUSPEND: |
802 | rpm_suspend(dev, RPM_NOWAIT | RPM_AUTO); | |
803 | break; | |
5e928f77 | 804 | case RPM_REQ_RESUME: |
140a6c94 | 805 | rpm_resume(dev, RPM_NOWAIT); |
5e928f77 RW |
806 | break; |
807 | } | |
808 | ||
809 | out: | |
810 | spin_unlock_irq(&dev->power.lock); | |
811 | } | |
812 | ||
5e928f77 RW |
813 | /** |
814 | * pm_suspend_timer_fn - Timer function for pm_schedule_suspend(). | |
815 | * @data: Device pointer passed by pm_schedule_suspend(). | |
816 | * | |
1bfee5bc | 817 | * Check if the time is right and queue a suspend request. |
5e928f77 RW |
818 | */ |
819 | static void pm_suspend_timer_fn(unsigned long data) | |
820 | { | |
821 | struct device *dev = (struct device *)data; | |
822 | unsigned long flags; | |
823 | unsigned long expires; | |
824 | ||
825 | spin_lock_irqsave(&dev->power.lock, flags); | |
826 | ||
827 | expires = dev->power.timer_expires; | |
828 | /* If 'expire' is after 'jiffies' we've been called too early. */ | |
829 | if (expires > 0 && !time_after(expires, jiffies)) { | |
830 | dev->power.timer_expires = 0; | |
15bcb91d AS |
831 | rpm_suspend(dev, dev->power.timer_autosuspends ? |
832 | (RPM_ASYNC | RPM_AUTO) : RPM_ASYNC); | |
5e928f77 RW |
833 | } |
834 | ||
835 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
836 | } | |
837 | ||
838 | /** | |
839 | * pm_schedule_suspend - Set up a timer to submit a suspend request in future. | |
840 | * @dev: Device to suspend. | |
841 | * @delay: Time to wait before submitting a suspend request, in milliseconds. | |
842 | */ | |
843 | int pm_schedule_suspend(struct device *dev, unsigned int delay) | |
844 | { | |
845 | unsigned long flags; | |
1bfee5bc | 846 | int retval; |
5e928f77 RW |
847 | |
848 | spin_lock_irqsave(&dev->power.lock, flags); | |
849 | ||
5e928f77 | 850 | if (!delay) { |
140a6c94 | 851 | retval = rpm_suspend(dev, RPM_ASYNC); |
5e928f77 RW |
852 | goto out; |
853 | } | |
854 | ||
1bfee5bc | 855 | retval = rpm_check_suspend_allowed(dev); |
5e928f77 RW |
856 | if (retval) |
857 | goto out; | |
858 | ||
1bfee5bc AS |
859 | /* Other scheduled or pending requests need to be canceled. */ |
860 | pm_runtime_cancel_pending(dev); | |
861 | ||
5e928f77 | 862 | dev->power.timer_expires = jiffies + msecs_to_jiffies(delay); |
1bfee5bc | 863 | dev->power.timer_expires += !dev->power.timer_expires; |
15bcb91d | 864 | dev->power.timer_autosuspends = 0; |
5e928f77 RW |
865 | mod_timer(&dev->power.suspend_timer, dev->power.timer_expires); |
866 | ||
867 | out: | |
868 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
869 | ||
870 | return retval; | |
871 | } | |
872 | EXPORT_SYMBOL_GPL(pm_schedule_suspend); | |
873 | ||
5e928f77 | 874 | /** |
62052ab1 | 875 | * __pm_runtime_idle - Entry point for runtime idle operations. |
140a6c94 AS |
876 | * @dev: Device to send idle notification for. |
877 | * @rpmflags: Flag bits. | |
878 | * | |
879 | * If the RPM_GET_PUT flag is set, decrement the device's usage count and | |
880 | * return immediately if it is larger than zero. Then carry out an idle | |
881 | * notification, either synchronous or asynchronous. | |
882 | * | |
311aab73 CC |
883 | * This routine may be called in atomic context if the RPM_ASYNC flag is set, |
884 | * or if pm_runtime_irq_safe() has been called. | |
5e928f77 | 885 | */ |
140a6c94 | 886 | int __pm_runtime_idle(struct device *dev, int rpmflags) |
5e928f77 RW |
887 | { |
888 | unsigned long flags; | |
889 | int retval; | |
890 | ||
311aab73 CC |
891 | might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe); |
892 | ||
140a6c94 AS |
893 | if (rpmflags & RPM_GET_PUT) { |
894 | if (!atomic_dec_and_test(&dev->power.usage_count)) | |
895 | return 0; | |
896 | } | |
897 | ||
5e928f77 | 898 | spin_lock_irqsave(&dev->power.lock, flags); |
140a6c94 | 899 | retval = rpm_idle(dev, rpmflags); |
5e928f77 RW |
900 | spin_unlock_irqrestore(&dev->power.lock, flags); |
901 | ||
902 | return retval; | |
903 | } | |
140a6c94 | 904 | EXPORT_SYMBOL_GPL(__pm_runtime_idle); |
5e928f77 RW |
905 | |
906 | /** | |
62052ab1 | 907 | * __pm_runtime_suspend - Entry point for runtime put/suspend operations. |
140a6c94 | 908 | * @dev: Device to suspend. |
3f9af051 | 909 | * @rpmflags: Flag bits. |
5e928f77 | 910 | * |
15bcb91d AS |
911 | * If the RPM_GET_PUT flag is set, decrement the device's usage count and |
912 | * return immediately if it is larger than zero. Then carry out a suspend, | |
913 | * either synchronous or asynchronous. | |
140a6c94 | 914 | * |
311aab73 CC |
915 | * This routine may be called in atomic context if the RPM_ASYNC flag is set, |
916 | * or if pm_runtime_irq_safe() has been called. | |
5e928f77 | 917 | */ |
140a6c94 | 918 | int __pm_runtime_suspend(struct device *dev, int rpmflags) |
5e928f77 | 919 | { |
140a6c94 | 920 | unsigned long flags; |
1d531c14 | 921 | int retval; |
5e928f77 | 922 | |
311aab73 CC |
923 | might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe); |
924 | ||
15bcb91d AS |
925 | if (rpmflags & RPM_GET_PUT) { |
926 | if (!atomic_dec_and_test(&dev->power.usage_count)) | |
927 | return 0; | |
928 | } | |
929 | ||
140a6c94 AS |
930 | spin_lock_irqsave(&dev->power.lock, flags); |
931 | retval = rpm_suspend(dev, rpmflags); | |
932 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
5e928f77 RW |
933 | |
934 | return retval; | |
935 | } | |
140a6c94 | 936 | EXPORT_SYMBOL_GPL(__pm_runtime_suspend); |
5e928f77 RW |
937 | |
938 | /** | |
62052ab1 | 939 | * __pm_runtime_resume - Entry point for runtime resume operations. |
140a6c94 | 940 | * @dev: Device to resume. |
3f9af051 | 941 | * @rpmflags: Flag bits. |
5e928f77 | 942 | * |
140a6c94 AS |
943 | * If the RPM_GET_PUT flag is set, increment the device's usage count. Then |
944 | * carry out a resume, either synchronous or asynchronous. | |
945 | * | |
311aab73 CC |
946 | * This routine may be called in atomic context if the RPM_ASYNC flag is set, |
947 | * or if pm_runtime_irq_safe() has been called. | |
5e928f77 | 948 | */ |
140a6c94 | 949 | int __pm_runtime_resume(struct device *dev, int rpmflags) |
5e928f77 | 950 | { |
140a6c94 AS |
951 | unsigned long flags; |
952 | int retval; | |
5e928f77 | 953 | |
311aab73 CC |
954 | might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe); |
955 | ||
140a6c94 AS |
956 | if (rpmflags & RPM_GET_PUT) |
957 | atomic_inc(&dev->power.usage_count); | |
958 | ||
959 | spin_lock_irqsave(&dev->power.lock, flags); | |
960 | retval = rpm_resume(dev, rpmflags); | |
961 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
5e928f77 RW |
962 | |
963 | return retval; | |
964 | } | |
140a6c94 | 965 | EXPORT_SYMBOL_GPL(__pm_runtime_resume); |
5e928f77 RW |
966 | |
967 | /** | |
62052ab1 | 968 | * __pm_runtime_set_status - Set runtime PM status of a device. |
5e928f77 | 969 | * @dev: Device to handle. |
62052ab1 | 970 | * @status: New runtime PM status of the device. |
5e928f77 | 971 | * |
62052ab1 | 972 | * If runtime PM of the device is disabled or its power.runtime_error field is |
5e928f77 RW |
973 | * different from zero, the status may be changed either to RPM_ACTIVE, or to |
974 | * RPM_SUSPENDED, as long as that reflects the actual state of the device. | |
975 | * However, if the device has a parent and the parent is not active, and the | |
976 | * parent's power.ignore_children flag is unset, the device's status cannot be | |
977 | * set to RPM_ACTIVE, so -EBUSY is returned in that case. | |
978 | * | |
979 | * If successful, __pm_runtime_set_status() clears the power.runtime_error field | |
980 | * and the device parent's counter of unsuspended children is modified to | |
981 | * reflect the new status. If the new status is RPM_SUSPENDED, an idle | |
982 | * notification request for the parent is submitted. | |
983 | */ | |
984 | int __pm_runtime_set_status(struct device *dev, unsigned int status) | |
985 | { | |
986 | struct device *parent = dev->parent; | |
987 | unsigned long flags; | |
988 | bool notify_parent = false; | |
989 | int error = 0; | |
990 | ||
991 | if (status != RPM_ACTIVE && status != RPM_SUSPENDED) | |
992 | return -EINVAL; | |
993 | ||
994 | spin_lock_irqsave(&dev->power.lock, flags); | |
995 | ||
996 | if (!dev->power.runtime_error && !dev->power.disable_depth) { | |
997 | error = -EAGAIN; | |
998 | goto out; | |
999 | } | |
1000 | ||
1001 | if (dev->power.runtime_status == status) | |
1002 | goto out_set; | |
1003 | ||
1004 | if (status == RPM_SUSPENDED) { | |
1005 | /* It always is possible to set the status to 'suspended'. */ | |
1006 | if (parent) { | |
1007 | atomic_add_unless(&parent->power.child_count, -1, 0); | |
1008 | notify_parent = !parent->power.ignore_children; | |
1009 | } | |
1010 | goto out_set; | |
1011 | } | |
1012 | ||
1013 | if (parent) { | |
bab636b9 | 1014 | spin_lock_nested(&parent->power.lock, SINGLE_DEPTH_NESTING); |
5e928f77 RW |
1015 | |
1016 | /* | |
1017 | * It is invalid to put an active child under a parent that is | |
62052ab1 | 1018 | * not active, has runtime PM enabled and the |
5e928f77 RW |
1019 | * 'power.ignore_children' flag unset. |
1020 | */ | |
1021 | if (!parent->power.disable_depth | |
1022 | && !parent->power.ignore_children | |
965c4ac0 | 1023 | && parent->power.runtime_status != RPM_ACTIVE) |
5e928f77 | 1024 | error = -EBUSY; |
965c4ac0 RW |
1025 | else if (dev->power.runtime_status == RPM_SUSPENDED) |
1026 | atomic_inc(&parent->power.child_count); | |
5e928f77 | 1027 | |
862f89b3 | 1028 | spin_unlock(&parent->power.lock); |
5e928f77 RW |
1029 | |
1030 | if (error) | |
1031 | goto out; | |
1032 | } | |
1033 | ||
1034 | out_set: | |
8d4b9d1b | 1035 | __update_runtime_status(dev, status); |
5e928f77 RW |
1036 | dev->power.runtime_error = 0; |
1037 | out: | |
1038 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1039 | ||
1040 | if (notify_parent) | |
1041 | pm_request_idle(parent); | |
1042 | ||
1043 | return error; | |
1044 | } | |
1045 | EXPORT_SYMBOL_GPL(__pm_runtime_set_status); | |
1046 | ||
1047 | /** | |
1048 | * __pm_runtime_barrier - Cancel pending requests and wait for completions. | |
1049 | * @dev: Device to handle. | |
1050 | * | |
1051 | * Flush all pending requests for the device from pm_wq and wait for all | |
62052ab1 | 1052 | * runtime PM operations involving the device in progress to complete. |
5e928f77 RW |
1053 | * |
1054 | * Should be called under dev->power.lock with interrupts disabled. | |
1055 | */ | |
1056 | static void __pm_runtime_barrier(struct device *dev) | |
1057 | { | |
1058 | pm_runtime_deactivate_timer(dev); | |
1059 | ||
1060 | if (dev->power.request_pending) { | |
1061 | dev->power.request = RPM_REQ_NONE; | |
1062 | spin_unlock_irq(&dev->power.lock); | |
1063 | ||
1064 | cancel_work_sync(&dev->power.work); | |
1065 | ||
1066 | spin_lock_irq(&dev->power.lock); | |
1067 | dev->power.request_pending = false; | |
1068 | } | |
1069 | ||
1070 | if (dev->power.runtime_status == RPM_SUSPENDING | |
1071 | || dev->power.runtime_status == RPM_RESUMING | |
1072 | || dev->power.idle_notification) { | |
1073 | DEFINE_WAIT(wait); | |
1074 | ||
1075 | /* Suspend, wake-up or idle notification in progress. */ | |
1076 | for (;;) { | |
1077 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
1078 | TASK_UNINTERRUPTIBLE); | |
1079 | if (dev->power.runtime_status != RPM_SUSPENDING | |
1080 | && dev->power.runtime_status != RPM_RESUMING | |
1081 | && !dev->power.idle_notification) | |
1082 | break; | |
1083 | spin_unlock_irq(&dev->power.lock); | |
1084 | ||
1085 | schedule(); | |
1086 | ||
1087 | spin_lock_irq(&dev->power.lock); | |
1088 | } | |
1089 | finish_wait(&dev->power.wait_queue, &wait); | |
1090 | } | |
1091 | } | |
1092 | ||
1093 | /** | |
1094 | * pm_runtime_barrier - Flush pending requests and wait for completions. | |
1095 | * @dev: Device to handle. | |
1096 | * | |
1097 | * Prevent the device from being suspended by incrementing its usage counter and | |
1098 | * if there's a pending resume request for the device, wake the device up. | |
1099 | * Next, make sure that all pending requests for the device have been flushed | |
62052ab1 | 1100 | * from pm_wq and wait for all runtime PM operations involving the device in |
5e928f77 RW |
1101 | * progress to complete. |
1102 | * | |
1103 | * Return value: | |
1104 | * 1, if there was a resume request pending and the device had to be woken up, | |
1105 | * 0, otherwise | |
1106 | */ | |
1107 | int pm_runtime_barrier(struct device *dev) | |
1108 | { | |
1109 | int retval = 0; | |
1110 | ||
1111 | pm_runtime_get_noresume(dev); | |
1112 | spin_lock_irq(&dev->power.lock); | |
1113 | ||
1114 | if (dev->power.request_pending | |
1115 | && dev->power.request == RPM_REQ_RESUME) { | |
140a6c94 | 1116 | rpm_resume(dev, 0); |
5e928f77 RW |
1117 | retval = 1; |
1118 | } | |
1119 | ||
1120 | __pm_runtime_barrier(dev); | |
1121 | ||
1122 | spin_unlock_irq(&dev->power.lock); | |
1123 | pm_runtime_put_noidle(dev); | |
1124 | ||
1125 | return retval; | |
1126 | } | |
1127 | EXPORT_SYMBOL_GPL(pm_runtime_barrier); | |
1128 | ||
1129 | /** | |
62052ab1 | 1130 | * __pm_runtime_disable - Disable runtime PM of a device. |
5e928f77 RW |
1131 | * @dev: Device to handle. |
1132 | * @check_resume: If set, check if there's a resume request for the device. | |
1133 | * | |
7b60894f | 1134 | * Increment power.disable_depth for the device and if it was zero previously, |
62052ab1 | 1135 | * cancel all pending runtime PM requests for the device and wait for all |
5e928f77 | 1136 | * operations in progress to complete. The device can be either active or |
62052ab1 | 1137 | * suspended after its runtime PM has been disabled. |
5e928f77 RW |
1138 | * |
1139 | * If @check_resume is set and there's a resume request pending when | |
1140 | * __pm_runtime_disable() is called and power.disable_depth is zero, the | |
62052ab1 | 1141 | * function will wake up the device before disabling its runtime PM. |
5e928f77 RW |
1142 | */ |
1143 | void __pm_runtime_disable(struct device *dev, bool check_resume) | |
1144 | { | |
1145 | spin_lock_irq(&dev->power.lock); | |
1146 | ||
1147 | if (dev->power.disable_depth > 0) { | |
1148 | dev->power.disable_depth++; | |
1149 | goto out; | |
1150 | } | |
1151 | ||
1152 | /* | |
1153 | * Wake up the device if there's a resume request pending, because that | |
62052ab1 | 1154 | * means there probably is some I/O to process and disabling runtime PM |
5e928f77 RW |
1155 | * shouldn't prevent the device from processing the I/O. |
1156 | */ | |
1157 | if (check_resume && dev->power.request_pending | |
1158 | && dev->power.request == RPM_REQ_RESUME) { | |
1159 | /* | |
1160 | * Prevent suspends and idle notifications from being carried | |
1161 | * out after we have woken up the device. | |
1162 | */ | |
1163 | pm_runtime_get_noresume(dev); | |
1164 | ||
140a6c94 | 1165 | rpm_resume(dev, 0); |
5e928f77 RW |
1166 | |
1167 | pm_runtime_put_noidle(dev); | |
1168 | } | |
1169 | ||
1170 | if (!dev->power.disable_depth++) | |
1171 | __pm_runtime_barrier(dev); | |
1172 | ||
1173 | out: | |
1174 | spin_unlock_irq(&dev->power.lock); | |
1175 | } | |
1176 | EXPORT_SYMBOL_GPL(__pm_runtime_disable); | |
1177 | ||
1178 | /** | |
62052ab1 | 1179 | * pm_runtime_enable - Enable runtime PM of a device. |
5e928f77 RW |
1180 | * @dev: Device to handle. |
1181 | */ | |
1182 | void pm_runtime_enable(struct device *dev) | |
1183 | { | |
1184 | unsigned long flags; | |
1185 | ||
1186 | spin_lock_irqsave(&dev->power.lock, flags); | |
1187 | ||
1188 | if (dev->power.disable_depth > 0) | |
1189 | dev->power.disable_depth--; | |
1190 | else | |
1191 | dev_warn(dev, "Unbalanced %s!\n", __func__); | |
1192 | ||
1193 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1194 | } | |
1195 | EXPORT_SYMBOL_GPL(pm_runtime_enable); | |
1196 | ||
53823639 | 1197 | /** |
62052ab1 | 1198 | * pm_runtime_forbid - Block runtime PM of a device. |
53823639 RW |
1199 | * @dev: Device to handle. |
1200 | * | |
1201 | * Increase the device's usage count and clear its power.runtime_auto flag, | |
1202 | * so that it cannot be suspended at run time until pm_runtime_allow() is called | |
1203 | * for it. | |
1204 | */ | |
1205 | void pm_runtime_forbid(struct device *dev) | |
1206 | { | |
1207 | spin_lock_irq(&dev->power.lock); | |
1208 | if (!dev->power.runtime_auto) | |
1209 | goto out; | |
1210 | ||
1211 | dev->power.runtime_auto = false; | |
1212 | atomic_inc(&dev->power.usage_count); | |
140a6c94 | 1213 | rpm_resume(dev, 0); |
53823639 RW |
1214 | |
1215 | out: | |
1216 | spin_unlock_irq(&dev->power.lock); | |
1217 | } | |
1218 | EXPORT_SYMBOL_GPL(pm_runtime_forbid); | |
1219 | ||
1220 | /** | |
62052ab1 | 1221 | * pm_runtime_allow - Unblock runtime PM of a device. |
53823639 RW |
1222 | * @dev: Device to handle. |
1223 | * | |
1224 | * Decrease the device's usage count and set its power.runtime_auto flag. | |
1225 | */ | |
1226 | void pm_runtime_allow(struct device *dev) | |
1227 | { | |
1228 | spin_lock_irq(&dev->power.lock); | |
1229 | if (dev->power.runtime_auto) | |
1230 | goto out; | |
1231 | ||
1232 | dev->power.runtime_auto = true; | |
1233 | if (atomic_dec_and_test(&dev->power.usage_count)) | |
15bcb91d | 1234 | rpm_idle(dev, RPM_AUTO); |
53823639 RW |
1235 | |
1236 | out: | |
1237 | spin_unlock_irq(&dev->power.lock); | |
1238 | } | |
1239 | EXPORT_SYMBOL_GPL(pm_runtime_allow); | |
1240 | ||
7490e442 | 1241 | /** |
62052ab1 | 1242 | * pm_runtime_no_callbacks - Ignore runtime PM callbacks for a device. |
7490e442 AS |
1243 | * @dev: Device to handle. |
1244 | * | |
1245 | * Set the power.no_callbacks flag, which tells the PM core that this | |
62052ab1 RW |
1246 | * device is power-managed through its parent and has no runtime PM |
1247 | * callbacks of its own. The runtime sysfs attributes will be removed. | |
7490e442 AS |
1248 | */ |
1249 | void pm_runtime_no_callbacks(struct device *dev) | |
1250 | { | |
1251 | spin_lock_irq(&dev->power.lock); | |
1252 | dev->power.no_callbacks = 1; | |
1253 | spin_unlock_irq(&dev->power.lock); | |
1254 | if (device_is_registered(dev)) | |
1255 | rpm_sysfs_remove(dev); | |
1256 | } | |
1257 | EXPORT_SYMBOL_GPL(pm_runtime_no_callbacks); | |
1258 | ||
c7b61de5 AS |
1259 | /** |
1260 | * pm_runtime_irq_safe - Leave interrupts disabled during callbacks. | |
1261 | * @dev: Device to handle | |
1262 | * | |
1263 | * Set the power.irq_safe flag, which tells the PM core that the | |
1264 | * ->runtime_suspend() and ->runtime_resume() callbacks for this device should | |
1265 | * always be invoked with the spinlock held and interrupts disabled. It also | |
1266 | * causes the parent's usage counter to be permanently incremented, preventing | |
1267 | * the parent from runtime suspending -- otherwise an irq-safe child might have | |
1268 | * to wait for a non-irq-safe parent. | |
1269 | */ | |
1270 | void pm_runtime_irq_safe(struct device *dev) | |
1271 | { | |
1272 | if (dev->parent) | |
1273 | pm_runtime_get_sync(dev->parent); | |
1274 | spin_lock_irq(&dev->power.lock); | |
1275 | dev->power.irq_safe = 1; | |
1276 | spin_unlock_irq(&dev->power.lock); | |
1277 | } | |
1278 | EXPORT_SYMBOL_GPL(pm_runtime_irq_safe); | |
1279 | ||
15bcb91d AS |
1280 | /** |
1281 | * update_autosuspend - Handle a change to a device's autosuspend settings. | |
1282 | * @dev: Device to handle. | |
1283 | * @old_delay: The former autosuspend_delay value. | |
1284 | * @old_use: The former use_autosuspend value. | |
1285 | * | |
1286 | * Prevent runtime suspend if the new delay is negative and use_autosuspend is | |
1287 | * set; otherwise allow it. Send an idle notification if suspends are allowed. | |
1288 | * | |
1289 | * This function must be called under dev->power.lock with interrupts disabled. | |
1290 | */ | |
1291 | static void update_autosuspend(struct device *dev, int old_delay, int old_use) | |
1292 | { | |
1293 | int delay = dev->power.autosuspend_delay; | |
1294 | ||
1295 | /* Should runtime suspend be prevented now? */ | |
1296 | if (dev->power.use_autosuspend && delay < 0) { | |
1297 | ||
1298 | /* If it used to be allowed then prevent it. */ | |
1299 | if (!old_use || old_delay >= 0) { | |
1300 | atomic_inc(&dev->power.usage_count); | |
1301 | rpm_resume(dev, 0); | |
1302 | } | |
1303 | } | |
1304 | ||
1305 | /* Runtime suspend should be allowed now. */ | |
1306 | else { | |
1307 | ||
1308 | /* If it used to be prevented then allow it. */ | |
1309 | if (old_use && old_delay < 0) | |
1310 | atomic_dec(&dev->power.usage_count); | |
1311 | ||
1312 | /* Maybe we can autosuspend now. */ | |
1313 | rpm_idle(dev, RPM_AUTO); | |
1314 | } | |
1315 | } | |
1316 | ||
1317 | /** | |
1318 | * pm_runtime_set_autosuspend_delay - Set a device's autosuspend_delay value. | |
1319 | * @dev: Device to handle. | |
1320 | * @delay: Value of the new delay in milliseconds. | |
1321 | * | |
1322 | * Set the device's power.autosuspend_delay value. If it changes to negative | |
62052ab1 RW |
1323 | * and the power.use_autosuspend flag is set, prevent runtime suspends. If it |
1324 | * changes the other way, allow runtime suspends. | |
15bcb91d AS |
1325 | */ |
1326 | void pm_runtime_set_autosuspend_delay(struct device *dev, int delay) | |
1327 | { | |
1328 | int old_delay, old_use; | |
1329 | ||
1330 | spin_lock_irq(&dev->power.lock); | |
1331 | old_delay = dev->power.autosuspend_delay; | |
1332 | old_use = dev->power.use_autosuspend; | |
1333 | dev->power.autosuspend_delay = delay; | |
1334 | update_autosuspend(dev, old_delay, old_use); | |
1335 | spin_unlock_irq(&dev->power.lock); | |
1336 | } | |
1337 | EXPORT_SYMBOL_GPL(pm_runtime_set_autosuspend_delay); | |
1338 | ||
1339 | /** | |
1340 | * __pm_runtime_use_autosuspend - Set a device's use_autosuspend flag. | |
1341 | * @dev: Device to handle. | |
1342 | * @use: New value for use_autosuspend. | |
1343 | * | |
62052ab1 | 1344 | * Set the device's power.use_autosuspend flag, and allow or prevent runtime |
15bcb91d AS |
1345 | * suspends as needed. |
1346 | */ | |
1347 | void __pm_runtime_use_autosuspend(struct device *dev, bool use) | |
1348 | { | |
1349 | int old_delay, old_use; | |
1350 | ||
1351 | spin_lock_irq(&dev->power.lock); | |
1352 | old_delay = dev->power.autosuspend_delay; | |
1353 | old_use = dev->power.use_autosuspend; | |
1354 | dev->power.use_autosuspend = use; | |
1355 | update_autosuspend(dev, old_delay, old_use); | |
1356 | spin_unlock_irq(&dev->power.lock); | |
1357 | } | |
1358 | EXPORT_SYMBOL_GPL(__pm_runtime_use_autosuspend); | |
1359 | ||
5e928f77 | 1360 | /** |
62052ab1 | 1361 | * pm_runtime_init - Initialize runtime PM fields in given device object. |
5e928f77 RW |
1362 | * @dev: Device object to initialize. |
1363 | */ | |
1364 | void pm_runtime_init(struct device *dev) | |
1365 | { | |
5e928f77 RW |
1366 | dev->power.runtime_status = RPM_SUSPENDED; |
1367 | dev->power.idle_notification = false; | |
1368 | ||
1369 | dev->power.disable_depth = 1; | |
1370 | atomic_set(&dev->power.usage_count, 0); | |
1371 | ||
1372 | dev->power.runtime_error = 0; | |
1373 | ||
1374 | atomic_set(&dev->power.child_count, 0); | |
1375 | pm_suspend_ignore_children(dev, false); | |
53823639 | 1376 | dev->power.runtime_auto = true; |
5e928f77 RW |
1377 | |
1378 | dev->power.request_pending = false; | |
1379 | dev->power.request = RPM_REQ_NONE; | |
1380 | dev->power.deferred_resume = false; | |
8d4b9d1b | 1381 | dev->power.accounting_timestamp = jiffies; |
5e928f77 RW |
1382 | INIT_WORK(&dev->power.work, pm_runtime_work); |
1383 | ||
1384 | dev->power.timer_expires = 0; | |
1385 | setup_timer(&dev->power.suspend_timer, pm_suspend_timer_fn, | |
1386 | (unsigned long)dev); | |
1387 | ||
1388 | init_waitqueue_head(&dev->power.wait_queue); | |
1389 | } | |
1390 | ||
1391 | /** | |
1392 | * pm_runtime_remove - Prepare for removing a device from device hierarchy. | |
1393 | * @dev: Device object being removed from device hierarchy. | |
1394 | */ | |
1395 | void pm_runtime_remove(struct device *dev) | |
1396 | { | |
1397 | __pm_runtime_disable(dev, false); | |
1398 | ||
1399 | /* Change the status back to 'suspended' to match the initial status. */ | |
1400 | if (dev->power.runtime_status == RPM_ACTIVE) | |
1401 | pm_runtime_set_suspended(dev); | |
c7b61de5 | 1402 | if (dev->power.irq_safe && dev->parent) |
db28dfac | 1403 | pm_runtime_put(dev->parent); |
5e928f77 | 1404 | } |
37f20416 UH |
1405 | #endif |
1406 | ||
1407 | /** | |
1408 | * pm_runtime_force_suspend - Force a device into suspend state if needed. | |
1409 | * @dev: Device to suspend. | |
1410 | * | |
1411 | * Disable runtime PM so we safely can check the device's runtime PM status and | |
1412 | * if it is active, invoke it's .runtime_suspend callback to bring it into | |
1413 | * suspend state. Keep runtime PM disabled to preserve the state unless we | |
1414 | * encounter errors. | |
1415 | * | |
1416 | * Typically this function may be invoked from a system suspend callback to make | |
1417 | * sure the device is put into low power state. | |
1418 | */ | |
1419 | int pm_runtime_force_suspend(struct device *dev) | |
1420 | { | |
1421 | int (*callback)(struct device *); | |
1422 | int ret = 0; | |
1423 | ||
1424 | pm_runtime_disable(dev); | |
1425 | ||
1426 | /* | |
1427 | * Note that pm_runtime_status_suspended() returns false while | |
1428 | * !CONFIG_PM_RUNTIME, which means the device will be put into low | |
1429 | * power state. | |
1430 | */ | |
1431 | if (pm_runtime_status_suspended(dev)) | |
1432 | return 0; | |
1433 | ||
1434 | callback = rpm_get_suspend_cb(dev); | |
1435 | ||
1436 | if (!callback) { | |
1437 | ret = -ENOSYS; | |
1438 | goto err; | |
1439 | } | |
1440 | ||
1441 | ret = callback(dev); | |
1442 | if (ret) | |
1443 | goto err; | |
1444 | ||
1445 | pm_runtime_set_suspended(dev); | |
1446 | return 0; | |
1447 | err: | |
1448 | pm_runtime_enable(dev); | |
1449 | return ret; | |
1450 | } | |
1451 | EXPORT_SYMBOL_GPL(pm_runtime_force_suspend); | |
1452 | ||
1453 | /** | |
1454 | * pm_runtime_force_resume - Force a device into resume state. | |
1455 | * @dev: Device to resume. | |
1456 | * | |
1457 | * Prior invoking this function we expect the user to have brought the device | |
1458 | * into low power state by a call to pm_runtime_force_suspend(). Here we reverse | |
1459 | * those actions and brings the device into full power. We update the runtime PM | |
1460 | * status and re-enables runtime PM. | |
1461 | * | |
1462 | * Typically this function may be invoked from a system resume callback to make | |
1463 | * sure the device is put into full power state. | |
1464 | */ | |
1465 | int pm_runtime_force_resume(struct device *dev) | |
1466 | { | |
1467 | int (*callback)(struct device *); | |
1468 | int ret = 0; | |
1469 | ||
1470 | callback = rpm_get_resume_cb(dev); | |
1471 | ||
1472 | if (!callback) { | |
1473 | ret = -ENOSYS; | |
1474 | goto out; | |
1475 | } | |
1476 | ||
1477 | ret = callback(dev); | |
1478 | if (ret) | |
1479 | goto out; | |
1480 | ||
1481 | pm_runtime_set_active(dev); | |
1482 | pm_runtime_mark_last_busy(dev); | |
1483 | out: | |
1484 | pm_runtime_enable(dev); | |
1485 | return ret; | |
1486 | } | |
1487 | EXPORT_SYMBOL_GPL(pm_runtime_force_resume); |