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 | |
140a6c94 | 16 | static int rpm_resume(struct device *dev, int rpmflags); |
7490e442 | 17 | static int rpm_suspend(struct device *dev, int rpmflags); |
5e928f77 | 18 | |
4769373c AS |
19 | /** |
20 | * update_pm_runtime_accounting - Update the time accounting of power states | |
21 | * @dev: Device to update the accounting for | |
22 | * | |
23 | * In order to be able to have time accounting of the various power states | |
24 | * (as used by programs such as PowerTOP to show the effectiveness of runtime | |
25 | * PM), we need to track the time spent in each state. | |
26 | * update_pm_runtime_accounting must be called each time before the | |
27 | * runtime_status field is updated, to account the time in the old state | |
28 | * correctly. | |
29 | */ | |
30 | void update_pm_runtime_accounting(struct device *dev) | |
31 | { | |
32 | unsigned long now = jiffies; | |
def0c0a3 | 33 | unsigned long delta; |
4769373c AS |
34 | |
35 | delta = now - dev->power.accounting_timestamp; | |
36 | ||
4769373c AS |
37 | dev->power.accounting_timestamp = now; |
38 | ||
39 | if (dev->power.disable_depth > 0) | |
40 | return; | |
41 | ||
42 | if (dev->power.runtime_status == RPM_SUSPENDED) | |
43 | dev->power.suspended_jiffies += delta; | |
44 | else | |
45 | dev->power.active_jiffies += delta; | |
46 | } | |
47 | ||
48 | static void __update_runtime_status(struct device *dev, enum rpm_status status) | |
49 | { | |
50 | update_pm_runtime_accounting(dev); | |
51 | dev->power.runtime_status = status; | |
52 | } | |
53 | ||
5e928f77 RW |
54 | /** |
55 | * pm_runtime_deactivate_timer - Deactivate given device's suspend timer. | |
56 | * @dev: Device to handle. | |
57 | */ | |
58 | static void pm_runtime_deactivate_timer(struct device *dev) | |
59 | { | |
60 | if (dev->power.timer_expires > 0) { | |
61 | del_timer(&dev->power.suspend_timer); | |
62 | dev->power.timer_expires = 0; | |
63 | } | |
64 | } | |
65 | ||
66 | /** | |
67 | * pm_runtime_cancel_pending - Deactivate suspend timer and cancel requests. | |
68 | * @dev: Device to handle. | |
69 | */ | |
70 | static void pm_runtime_cancel_pending(struct device *dev) | |
71 | { | |
72 | pm_runtime_deactivate_timer(dev); | |
73 | /* | |
74 | * In case there's a request pending, make sure its work function will | |
75 | * return without doing anything. | |
76 | */ | |
77 | dev->power.request = RPM_REQ_NONE; | |
78 | } | |
79 | ||
15bcb91d AS |
80 | /* |
81 | * pm_runtime_autosuspend_expiration - Get a device's autosuspend-delay expiration time. | |
82 | * @dev: Device to handle. | |
83 | * | |
84 | * Compute the autosuspend-delay expiration time based on the device's | |
85 | * power.last_busy time. If the delay has already expired or is disabled | |
86 | * (negative) or the power.use_autosuspend flag isn't set, return 0. | |
87 | * Otherwise return the expiration time in jiffies (adjusted to be nonzero). | |
88 | * | |
89 | * This function may be called either with or without dev->power.lock held. | |
90 | * Either way it can be racy, since power.last_busy may be updated at any time. | |
91 | */ | |
92 | unsigned long pm_runtime_autosuspend_expiration(struct device *dev) | |
93 | { | |
94 | int autosuspend_delay; | |
95 | long elapsed; | |
96 | unsigned long last_busy; | |
97 | unsigned long expires = 0; | |
98 | ||
99 | if (!dev->power.use_autosuspend) | |
100 | goto out; | |
101 | ||
102 | autosuspend_delay = ACCESS_ONCE(dev->power.autosuspend_delay); | |
103 | if (autosuspend_delay < 0) | |
104 | goto out; | |
105 | ||
106 | last_busy = ACCESS_ONCE(dev->power.last_busy); | |
107 | elapsed = jiffies - last_busy; | |
108 | if (elapsed < 0) | |
109 | goto out; /* jiffies has wrapped around. */ | |
110 | ||
111 | /* | |
112 | * If the autosuspend_delay is >= 1 second, align the timer by rounding | |
113 | * up to the nearest second. | |
114 | */ | |
115 | expires = last_busy + msecs_to_jiffies(autosuspend_delay); | |
116 | if (autosuspend_delay >= 1000) | |
117 | expires = round_jiffies(expires); | |
118 | expires += !expires; | |
119 | if (elapsed >= expires - last_busy) | |
120 | expires = 0; /* Already expired. */ | |
121 | ||
122 | out: | |
123 | return expires; | |
124 | } | |
125 | EXPORT_SYMBOL_GPL(pm_runtime_autosuspend_expiration); | |
126 | ||
5e928f77 | 127 | /** |
1bfee5bc AS |
128 | * rpm_check_suspend_allowed - Test whether a device may be suspended. |
129 | * @dev: Device to test. | |
5e928f77 | 130 | */ |
1bfee5bc | 131 | static int rpm_check_suspend_allowed(struct device *dev) |
5e928f77 RW |
132 | { |
133 | int retval = 0; | |
134 | ||
5e928f77 RW |
135 | if (dev->power.runtime_error) |
136 | retval = -EINVAL; | |
632e270e RW |
137 | else if (dev->power.disable_depth > 0) |
138 | retval = -EACCES; | |
139 | else if (atomic_read(&dev->power.usage_count) > 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 | |
78ca7c37 | 146 | && dev->power.runtime_status == RPM_SUSPENDING) |
1bfee5bc AS |
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 | ||
ad3c36a5 RW |
156 | /** |
157 | * __rpm_callback - Run a given runtime PM callback for a given device. | |
158 | * @cb: Runtime PM callback to run. | |
159 | * @dev: Device to run the callback for. | |
160 | */ | |
161 | static int __rpm_callback(int (*cb)(struct device *), struct device *dev) | |
162 | __releases(&dev->power.lock) __acquires(&dev->power.lock) | |
163 | { | |
164 | int retval; | |
165 | ||
166 | if (dev->power.irq_safe) | |
167 | spin_unlock(&dev->power.lock); | |
168 | else | |
169 | spin_unlock_irq(&dev->power.lock); | |
170 | ||
171 | retval = cb(dev); | |
172 | ||
173 | if (dev->power.irq_safe) | |
174 | spin_lock(&dev->power.lock); | |
175 | else | |
176 | spin_lock_irq(&dev->power.lock); | |
177 | ||
178 | return retval; | |
179 | } | |
180 | ||
1bfee5bc | 181 | /** |
140a6c94 | 182 | * rpm_idle - Notify device bus type if the device can be suspended. |
1bfee5bc AS |
183 | * @dev: Device to notify the bus type about. |
184 | * @rpmflags: Flag bits. | |
185 | * | |
62052ab1 | 186 | * Check if the device's runtime PM status allows it to be suspended. If |
1bfee5bc AS |
187 | * another idle notification has been started earlier, return immediately. If |
188 | * the RPM_ASYNC flag is set then queue an idle-notification request; otherwise | |
189 | * run the ->runtime_idle() callback directly. | |
190 | * | |
191 | * This function must be called under dev->power.lock with interrupts disabled. | |
192 | */ | |
140a6c94 | 193 | static int rpm_idle(struct device *dev, int rpmflags) |
1bfee5bc | 194 | { |
71c63122 | 195 | int (*callback)(struct device *); |
1bfee5bc AS |
196 | int retval; |
197 | ||
c3dc2f14 | 198 | trace_rpm_idle(dev, rpmflags); |
1bfee5bc AS |
199 | retval = rpm_check_suspend_allowed(dev); |
200 | if (retval < 0) | |
201 | ; /* Conditions are wrong. */ | |
202 | ||
203 | /* Idle notifications are allowed only in the RPM_ACTIVE state. */ | |
204 | else if (dev->power.runtime_status != RPM_ACTIVE) | |
205 | retval = -EAGAIN; | |
206 | ||
207 | /* | |
208 | * Any pending request other than an idle notification takes | |
209 | * precedence over us, except that the timer may be running. | |
210 | */ | |
211 | else if (dev->power.request_pending && | |
212 | dev->power.request > RPM_REQ_IDLE) | |
213 | retval = -EAGAIN; | |
214 | ||
215 | /* Act as though RPM_NOWAIT is always set. */ | |
216 | else if (dev->power.idle_notification) | |
217 | retval = -EINPROGRESS; | |
5e928f77 RW |
218 | if (retval) |
219 | goto out; | |
220 | ||
1bfee5bc AS |
221 | /* Pending requests need to be canceled. */ |
222 | dev->power.request = RPM_REQ_NONE; | |
223 | ||
7490e442 AS |
224 | if (dev->power.no_callbacks) { |
225 | /* Assume ->runtime_idle() callback would have suspended. */ | |
226 | retval = rpm_suspend(dev, rpmflags); | |
227 | goto out; | |
228 | } | |
229 | ||
1bfee5bc AS |
230 | /* Carry out an asynchronous or a synchronous idle notification. */ |
231 | if (rpmflags & RPM_ASYNC) { | |
232 | dev->power.request = RPM_REQ_IDLE; | |
233 | if (!dev->power.request_pending) { | |
234 | dev->power.request_pending = true; | |
235 | queue_work(pm_wq, &dev->power.work); | |
5e928f77 | 236 | } |
1bfee5bc | 237 | goto out; |
5e928f77 RW |
238 | } |
239 | ||
240 | dev->power.idle_notification = true; | |
241 | ||
564b905a RW |
242 | if (dev->pm_domain) |
243 | callback = dev->pm_domain->ops.runtime_idle; | |
4d27e9dc | 244 | else if (dev->type && dev->type->pm) |
71c63122 RW |
245 | callback = dev->type->pm->runtime_idle; |
246 | else if (dev->class && dev->class->pm) | |
247 | callback = dev->class->pm->runtime_idle; | |
9659cc06 RW |
248 | else if (dev->bus && dev->bus->pm) |
249 | callback = dev->bus->pm->runtime_idle; | |
71c63122 RW |
250 | else |
251 | callback = NULL; | |
a6ab7aa9 | 252 | |
35cd133c RW |
253 | if (!callback && dev->driver && dev->driver->pm) |
254 | callback = dev->driver->pm->runtime_idle; | |
255 | ||
ad3c36a5 RW |
256 | if (callback) |
257 | __rpm_callback(callback, dev); | |
5e928f77 RW |
258 | |
259 | dev->power.idle_notification = false; | |
260 | wake_up_all(&dev->power.wait_queue); | |
261 | ||
262 | out: | |
c3dc2f14 | 263 | trace_rpm_return_int(dev, _THIS_IP_, retval); |
5e928f77 RW |
264 | return retval; |
265 | } | |
266 | ||
71c63122 RW |
267 | /** |
268 | * rpm_callback - Run a given runtime PM callback for a given device. | |
269 | * @cb: Runtime PM callback to run. | |
270 | * @dev: Device to run the callback for. | |
271 | */ | |
272 | static int rpm_callback(int (*cb)(struct device *), struct device *dev) | |
71c63122 RW |
273 | { |
274 | int retval; | |
275 | ||
276 | if (!cb) | |
277 | return -ENOSYS; | |
278 | ||
ad3c36a5 | 279 | retval = __rpm_callback(cb, dev); |
71c63122 | 280 | |
71c63122 | 281 | dev->power.runtime_error = retval; |
632e270e | 282 | return retval != -EACCES ? retval : -EIO; |
71c63122 RW |
283 | } |
284 | ||
00dc9ad1 RW |
285 | struct rpm_qos_data { |
286 | ktime_t time_now; | |
287 | s64 constraint_ns; | |
288 | }; | |
289 | ||
290 | /** | |
291 | * rpm_update_qos_constraint - Update a given PM QoS constraint data. | |
292 | * @dev: Device whose timing data to use. | |
293 | * @data: PM QoS constraint data to update. | |
294 | * | |
295 | * Use the suspend timing data of @dev to update PM QoS constraint data pointed | |
296 | * to by @data. | |
297 | */ | |
298 | static int rpm_update_qos_constraint(struct device *dev, void *data) | |
299 | { | |
300 | struct rpm_qos_data *qos = data; | |
301 | unsigned long flags; | |
302 | s64 delta_ns; | |
303 | int ret = 0; | |
304 | ||
305 | spin_lock_irqsave(&dev->power.lock, flags); | |
306 | ||
307 | if (dev->power.max_time_suspended_ns < 0) | |
308 | goto out; | |
309 | ||
310 | delta_ns = dev->power.max_time_suspended_ns - | |
311 | ktime_to_ns(ktime_sub(qos->time_now, dev->power.suspend_time)); | |
312 | if (delta_ns <= 0) { | |
313 | ret = -EBUSY; | |
314 | goto out; | |
315 | } | |
316 | ||
317 | if (qos->constraint_ns > delta_ns || qos->constraint_ns == 0) | |
318 | qos->constraint_ns = delta_ns; | |
319 | ||
320 | out: | |
321 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
322 | ||
323 | return ret; | |
324 | } | |
325 | ||
5e928f77 | 326 | /** |
62052ab1 | 327 | * rpm_suspend - Carry out runtime suspend of given device. |
5e928f77 | 328 | * @dev: Device to suspend. |
3f9af051 | 329 | * @rpmflags: Flag bits. |
5e928f77 | 330 | * |
47d8f0ba ML |
331 | * Check if the device's runtime PM status allows it to be suspended. |
332 | * Cancel a pending idle notification, autosuspend or suspend. If | |
333 | * another suspend has been started earlier, either return immediately | |
334 | * or wait for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC | |
335 | * flags. If the RPM_ASYNC flag is set then queue a suspend request; | |
857b36c7 ML |
336 | * otherwise run the ->runtime_suspend() callback directly. When |
337 | * ->runtime_suspend succeeded, if a deferred resume was requested while | |
338 | * the callback was running then carry it out, otherwise send an idle | |
339 | * notification for its parent (if the suspend succeeded and both | |
340 | * ignore_children of parent->power and irq_safe of dev->power are not set). | |
886486b7 AS |
341 | * If ->runtime_suspend failed with -EAGAIN or -EBUSY, and if the RPM_AUTO |
342 | * flag is set and the next autosuspend-delay expiration time is in the | |
343 | * future, schedule another autosuspend attempt. | |
5e928f77 RW |
344 | * |
345 | * This function must be called under dev->power.lock with interrupts disabled. | |
346 | */ | |
140a6c94 | 347 | static int rpm_suspend(struct device *dev, int rpmflags) |
5e928f77 RW |
348 | __releases(&dev->power.lock) __acquires(&dev->power.lock) |
349 | { | |
71c63122 | 350 | int (*callback)(struct device *); |
5e928f77 | 351 | struct device *parent = NULL; |
00dc9ad1 | 352 | struct rpm_qos_data qos; |
1bfee5bc | 353 | int retval; |
5e928f77 | 354 | |
c3dc2f14 | 355 | trace_rpm_suspend(dev, rpmflags); |
5e928f77 RW |
356 | |
357 | repeat: | |
1bfee5bc | 358 | retval = rpm_check_suspend_allowed(dev); |
5e928f77 | 359 | |
1bfee5bc AS |
360 | if (retval < 0) |
361 | ; /* Conditions are wrong. */ | |
362 | ||
363 | /* Synchronous suspends are not allowed in the RPM_RESUMING state. */ | |
364 | else if (dev->power.runtime_status == RPM_RESUMING && | |
365 | !(rpmflags & RPM_ASYNC)) | |
5e928f77 | 366 | retval = -EAGAIN; |
1bfee5bc | 367 | if (retval) |
5e928f77 | 368 | goto out; |
5e928f77 | 369 | |
15bcb91d AS |
370 | /* If the autosuspend_delay time hasn't expired yet, reschedule. */ |
371 | if ((rpmflags & RPM_AUTO) | |
372 | && dev->power.runtime_status != RPM_SUSPENDING) { | |
373 | unsigned long expires = pm_runtime_autosuspend_expiration(dev); | |
374 | ||
375 | if (expires != 0) { | |
376 | /* Pending requests need to be canceled. */ | |
377 | dev->power.request = RPM_REQ_NONE; | |
378 | ||
379 | /* | |
380 | * Optimization: If the timer is already running and is | |
381 | * set to expire at or before the autosuspend delay, | |
382 | * avoid the overhead of resetting it. Just let it | |
383 | * expire; pm_suspend_timer_fn() will take care of the | |
384 | * rest. | |
385 | */ | |
386 | if (!(dev->power.timer_expires && time_before_eq( | |
387 | dev->power.timer_expires, expires))) { | |
388 | dev->power.timer_expires = expires; | |
389 | mod_timer(&dev->power.suspend_timer, expires); | |
390 | } | |
391 | dev->power.timer_autosuspends = 1; | |
392 | goto out; | |
393 | } | |
394 | } | |
395 | ||
5e928f77 RW |
396 | /* Other scheduled or pending requests need to be canceled. */ |
397 | pm_runtime_cancel_pending(dev); | |
398 | ||
5e928f77 RW |
399 | if (dev->power.runtime_status == RPM_SUSPENDING) { |
400 | DEFINE_WAIT(wait); | |
401 | ||
1bfee5bc | 402 | if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) { |
5e928f77 RW |
403 | retval = -EINPROGRESS; |
404 | goto out; | |
405 | } | |
406 | ||
ad3c36a5 RW |
407 | if (dev->power.irq_safe) { |
408 | spin_unlock(&dev->power.lock); | |
409 | ||
410 | cpu_relax(); | |
411 | ||
412 | spin_lock(&dev->power.lock); | |
413 | goto repeat; | |
414 | } | |
415 | ||
5e928f77 RW |
416 | /* Wait for the other suspend running in parallel with us. */ |
417 | for (;;) { | |
418 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
419 | TASK_UNINTERRUPTIBLE); | |
420 | if (dev->power.runtime_status != RPM_SUSPENDING) | |
421 | break; | |
422 | ||
423 | spin_unlock_irq(&dev->power.lock); | |
424 | ||
425 | schedule(); | |
426 | ||
427 | spin_lock_irq(&dev->power.lock); | |
428 | } | |
429 | finish_wait(&dev->power.wait_queue, &wait); | |
430 | goto repeat; | |
431 | } | |
432 | ||
7490e442 AS |
433 | dev->power.deferred_resume = false; |
434 | if (dev->power.no_callbacks) | |
435 | goto no_callback; /* Assume success. */ | |
436 | ||
1bfee5bc AS |
437 | /* Carry out an asynchronous or a synchronous suspend. */ |
438 | if (rpmflags & RPM_ASYNC) { | |
15bcb91d AS |
439 | dev->power.request = (rpmflags & RPM_AUTO) ? |
440 | RPM_REQ_AUTOSUSPEND : RPM_REQ_SUSPEND; | |
1bfee5bc AS |
441 | if (!dev->power.request_pending) { |
442 | dev->power.request_pending = true; | |
443 | queue_work(pm_wq, &dev->power.work); | |
444 | } | |
445 | goto out; | |
446 | } | |
447 | ||
00dc9ad1 RW |
448 | qos.constraint_ns = __dev_pm_qos_read_value(dev); |
449 | if (qos.constraint_ns < 0) { | |
450 | /* Negative constraint means "never suspend". */ | |
451 | retval = -EPERM; | |
452 | goto out; | |
453 | } | |
454 | qos.constraint_ns *= NSEC_PER_USEC; | |
455 | qos.time_now = ktime_get(); | |
456 | ||
8d4b9d1b | 457 | __update_runtime_status(dev, RPM_SUSPENDING); |
5e928f77 | 458 | |
00dc9ad1 RW |
459 | if (!dev->power.ignore_children) { |
460 | if (dev->power.irq_safe) | |
461 | spin_unlock(&dev->power.lock); | |
462 | else | |
463 | spin_unlock_irq(&dev->power.lock); | |
464 | ||
465 | retval = device_for_each_child(dev, &qos, | |
466 | rpm_update_qos_constraint); | |
467 | ||
468 | if (dev->power.irq_safe) | |
469 | spin_lock(&dev->power.lock); | |
470 | else | |
471 | spin_lock_irq(&dev->power.lock); | |
472 | ||
473 | if (retval) | |
474 | goto fail; | |
475 | } | |
476 | ||
477 | dev->power.suspend_time = qos.time_now; | |
478 | dev->power.max_time_suspended_ns = qos.constraint_ns ? : -1; | |
479 | ||
564b905a RW |
480 | if (dev->pm_domain) |
481 | callback = dev->pm_domain->ops.runtime_suspend; | |
4d27e9dc | 482 | else if (dev->type && dev->type->pm) |
71c63122 RW |
483 | callback = dev->type->pm->runtime_suspend; |
484 | else if (dev->class && dev->class->pm) | |
485 | callback = dev->class->pm->runtime_suspend; | |
9659cc06 RW |
486 | else if (dev->bus && dev->bus->pm) |
487 | callback = dev->bus->pm->runtime_suspend; | |
71c63122 RW |
488 | else |
489 | callback = NULL; | |
5e928f77 | 490 | |
35cd133c RW |
491 | if (!callback && dev->driver && dev->driver->pm) |
492 | callback = dev->driver->pm->runtime_suspend; | |
493 | ||
71c63122 | 494 | retval = rpm_callback(callback, dev); |
00dc9ad1 RW |
495 | if (retval) |
496 | goto fail; | |
886486b7 | 497 | |
7490e442 | 498 | no_callback: |
857b36c7 ML |
499 | __update_runtime_status(dev, RPM_SUSPENDED); |
500 | pm_runtime_deactivate_timer(dev); | |
5e928f77 | 501 | |
857b36c7 ML |
502 | if (dev->parent) { |
503 | parent = dev->parent; | |
504 | atomic_add_unless(&parent->power.child_count, -1, 0); | |
5e928f77 RW |
505 | } |
506 | wake_up_all(&dev->power.wait_queue); | |
507 | ||
508 | if (dev->power.deferred_resume) { | |
140a6c94 | 509 | rpm_resume(dev, 0); |
5e928f77 RW |
510 | retval = -EAGAIN; |
511 | goto out; | |
512 | } | |
513 | ||
c3810c88 | 514 | /* Maybe the parent is now able to suspend. */ |
c7b61de5 | 515 | if (parent && !parent->power.ignore_children && !dev->power.irq_safe) { |
c3810c88 | 516 | spin_unlock(&dev->power.lock); |
5e928f77 | 517 | |
c3810c88 AS |
518 | spin_lock(&parent->power.lock); |
519 | rpm_idle(parent, RPM_ASYNC); | |
520 | spin_unlock(&parent->power.lock); | |
5e928f77 | 521 | |
c3810c88 | 522 | spin_lock(&dev->power.lock); |
5e928f77 RW |
523 | } |
524 | ||
525 | out: | |
c3dc2f14 | 526 | trace_rpm_return_int(dev, _THIS_IP_, retval); |
5e928f77 RW |
527 | |
528 | return retval; | |
00dc9ad1 RW |
529 | |
530 | fail: | |
531 | __update_runtime_status(dev, RPM_ACTIVE); | |
532 | dev->power.suspend_time = ktime_set(0, 0); | |
533 | dev->power.max_time_suspended_ns = -1; | |
534 | dev->power.deferred_resume = false; | |
535 | if (retval == -EAGAIN || retval == -EBUSY) { | |
536 | dev->power.runtime_error = 0; | |
537 | ||
538 | /* | |
539 | * If the callback routine failed an autosuspend, and | |
540 | * if the last_busy time has been updated so that there | |
541 | * is a new autosuspend expiration time, automatically | |
542 | * reschedule another autosuspend. | |
543 | */ | |
544 | if ((rpmflags & RPM_AUTO) && | |
545 | pm_runtime_autosuspend_expiration(dev) != 0) | |
546 | goto repeat; | |
547 | } else { | |
548 | pm_runtime_cancel_pending(dev); | |
549 | } | |
550 | wake_up_all(&dev->power.wait_queue); | |
551 | goto out; | |
5e928f77 RW |
552 | } |
553 | ||
554 | /** | |
62052ab1 | 555 | * rpm_resume - Carry out runtime resume of given device. |
5e928f77 | 556 | * @dev: Device to resume. |
3f9af051 | 557 | * @rpmflags: Flag bits. |
5e928f77 | 558 | * |
62052ab1 | 559 | * Check if the device's runtime PM status allows it to be resumed. Cancel |
1bfee5bc | 560 | * any scheduled or pending requests. If another resume has been started |
25985edc | 561 | * earlier, either return immediately or wait for it to finish, depending on the |
1bfee5bc AS |
562 | * RPM_NOWAIT and RPM_ASYNC flags. Similarly, if there's a suspend running in |
563 | * parallel with this function, either tell the other process to resume after | |
564 | * suspending (deferred_resume) or wait for it to finish. If the RPM_ASYNC | |
565 | * flag is set then queue a resume request; otherwise run the | |
566 | * ->runtime_resume() callback directly. Queue an idle notification for the | |
567 | * device if the resume succeeded. | |
5e928f77 RW |
568 | * |
569 | * This function must be called under dev->power.lock with interrupts disabled. | |
570 | */ | |
140a6c94 | 571 | static int rpm_resume(struct device *dev, int rpmflags) |
5e928f77 RW |
572 | __releases(&dev->power.lock) __acquires(&dev->power.lock) |
573 | { | |
71c63122 | 574 | int (*callback)(struct device *); |
5e928f77 RW |
575 | struct device *parent = NULL; |
576 | int retval = 0; | |
577 | ||
c3dc2f14 | 578 | trace_rpm_resume(dev, rpmflags); |
5e928f77 RW |
579 | |
580 | repeat: | |
1bfee5bc | 581 | if (dev->power.runtime_error) |
5e928f77 | 582 | retval = -EINVAL; |
1bfee5bc | 583 | else if (dev->power.disable_depth > 0) |
632e270e | 584 | retval = -EACCES; |
1bfee5bc | 585 | if (retval) |
5e928f77 | 586 | goto out; |
5e928f77 | 587 | |
15bcb91d AS |
588 | /* |
589 | * Other scheduled or pending requests need to be canceled. Small | |
590 | * optimization: If an autosuspend timer is running, leave it running | |
591 | * rather than cancelling it now only to restart it again in the near | |
592 | * future. | |
593 | */ | |
594 | dev->power.request = RPM_REQ_NONE; | |
595 | if (!dev->power.timer_autosuspends) | |
596 | pm_runtime_deactivate_timer(dev); | |
5e928f77 | 597 | |
1bfee5bc | 598 | if (dev->power.runtime_status == RPM_ACTIVE) { |
5e928f77 | 599 | retval = 1; |
5e928f77 | 600 | goto out; |
1bfee5bc | 601 | } |
5e928f77 RW |
602 | |
603 | if (dev->power.runtime_status == RPM_RESUMING | |
604 | || dev->power.runtime_status == RPM_SUSPENDING) { | |
605 | DEFINE_WAIT(wait); | |
606 | ||
1bfee5bc | 607 | if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) { |
5e928f77 RW |
608 | if (dev->power.runtime_status == RPM_SUSPENDING) |
609 | dev->power.deferred_resume = true; | |
1bfee5bc AS |
610 | else |
611 | retval = -EINPROGRESS; | |
5e928f77 RW |
612 | goto out; |
613 | } | |
614 | ||
ad3c36a5 RW |
615 | if (dev->power.irq_safe) { |
616 | spin_unlock(&dev->power.lock); | |
617 | ||
618 | cpu_relax(); | |
619 | ||
620 | spin_lock(&dev->power.lock); | |
621 | goto repeat; | |
622 | } | |
623 | ||
5e928f77 RW |
624 | /* Wait for the operation carried out in parallel with us. */ |
625 | for (;;) { | |
626 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
627 | TASK_UNINTERRUPTIBLE); | |
628 | if (dev->power.runtime_status != RPM_RESUMING | |
629 | && dev->power.runtime_status != RPM_SUSPENDING) | |
630 | break; | |
631 | ||
632 | spin_unlock_irq(&dev->power.lock); | |
633 | ||
634 | schedule(); | |
635 | ||
636 | spin_lock_irq(&dev->power.lock); | |
637 | } | |
638 | finish_wait(&dev->power.wait_queue, &wait); | |
639 | goto repeat; | |
640 | } | |
641 | ||
7490e442 AS |
642 | /* |
643 | * See if we can skip waking up the parent. This is safe only if | |
644 | * power.no_callbacks is set, because otherwise we don't know whether | |
645 | * the resume will actually succeed. | |
646 | */ | |
647 | if (dev->power.no_callbacks && !parent && dev->parent) { | |
d63be5f9 | 648 | spin_lock_nested(&dev->parent->power.lock, SINGLE_DEPTH_NESTING); |
7490e442 AS |
649 | if (dev->parent->power.disable_depth > 0 |
650 | || dev->parent->power.ignore_children | |
651 | || dev->parent->power.runtime_status == RPM_ACTIVE) { | |
652 | atomic_inc(&dev->parent->power.child_count); | |
653 | spin_unlock(&dev->parent->power.lock); | |
654 | goto no_callback; /* Assume success. */ | |
655 | } | |
656 | spin_unlock(&dev->parent->power.lock); | |
657 | } | |
658 | ||
1bfee5bc AS |
659 | /* Carry out an asynchronous or a synchronous resume. */ |
660 | if (rpmflags & RPM_ASYNC) { | |
661 | dev->power.request = RPM_REQ_RESUME; | |
662 | if (!dev->power.request_pending) { | |
663 | dev->power.request_pending = true; | |
664 | queue_work(pm_wq, &dev->power.work); | |
665 | } | |
666 | retval = 0; | |
667 | goto out; | |
668 | } | |
669 | ||
5e928f77 RW |
670 | if (!parent && dev->parent) { |
671 | /* | |
c7b61de5 AS |
672 | * Increment the parent's usage counter and resume it if |
673 | * necessary. Not needed if dev is irq-safe; then the | |
674 | * parent is permanently resumed. | |
5e928f77 RW |
675 | */ |
676 | parent = dev->parent; | |
c7b61de5 AS |
677 | if (dev->power.irq_safe) |
678 | goto skip_parent; | |
862f89b3 | 679 | spin_unlock(&dev->power.lock); |
5e928f77 RW |
680 | |
681 | pm_runtime_get_noresume(parent); | |
682 | ||
862f89b3 | 683 | spin_lock(&parent->power.lock); |
5e928f77 | 684 | /* |
62052ab1 | 685 | * We can resume if the parent's runtime PM is disabled or it |
5e928f77 RW |
686 | * is set to ignore children. |
687 | */ | |
688 | if (!parent->power.disable_depth | |
689 | && !parent->power.ignore_children) { | |
140a6c94 | 690 | rpm_resume(parent, 0); |
5e928f77 RW |
691 | if (parent->power.runtime_status != RPM_ACTIVE) |
692 | retval = -EBUSY; | |
693 | } | |
862f89b3 | 694 | spin_unlock(&parent->power.lock); |
5e928f77 | 695 | |
862f89b3 | 696 | spin_lock(&dev->power.lock); |
5e928f77 RW |
697 | if (retval) |
698 | goto out; | |
699 | goto repeat; | |
700 | } | |
c7b61de5 | 701 | skip_parent: |
5e928f77 | 702 | |
7490e442 AS |
703 | if (dev->power.no_callbacks) |
704 | goto no_callback; /* Assume success. */ | |
705 | ||
00dc9ad1 RW |
706 | dev->power.suspend_time = ktime_set(0, 0); |
707 | dev->power.max_time_suspended_ns = -1; | |
708 | ||
8d4b9d1b | 709 | __update_runtime_status(dev, RPM_RESUMING); |
5e928f77 | 710 | |
564b905a RW |
711 | if (dev->pm_domain) |
712 | callback = dev->pm_domain->ops.runtime_resume; | |
4d27e9dc | 713 | else if (dev->type && dev->type->pm) |
71c63122 RW |
714 | callback = dev->type->pm->runtime_resume; |
715 | else if (dev->class && dev->class->pm) | |
716 | callback = dev->class->pm->runtime_resume; | |
9659cc06 RW |
717 | else if (dev->bus && dev->bus->pm) |
718 | callback = dev->bus->pm->runtime_resume; | |
71c63122 RW |
719 | else |
720 | callback = NULL; | |
5e928f77 | 721 | |
35cd133c RW |
722 | if (!callback && dev->driver && dev->driver->pm) |
723 | callback = dev->driver->pm->runtime_resume; | |
724 | ||
71c63122 | 725 | retval = rpm_callback(callback, dev); |
5e928f77 | 726 | if (retval) { |
8d4b9d1b | 727 | __update_runtime_status(dev, RPM_SUSPENDED); |
5e928f77 RW |
728 | pm_runtime_cancel_pending(dev); |
729 | } else { | |
7490e442 | 730 | no_callback: |
8d4b9d1b | 731 | __update_runtime_status(dev, RPM_ACTIVE); |
5e928f77 RW |
732 | if (parent) |
733 | atomic_inc(&parent->power.child_count); | |
734 | } | |
735 | wake_up_all(&dev->power.wait_queue); | |
736 | ||
737 | if (!retval) | |
140a6c94 | 738 | rpm_idle(dev, RPM_ASYNC); |
5e928f77 RW |
739 | |
740 | out: | |
c7b61de5 | 741 | if (parent && !dev->power.irq_safe) { |
5e928f77 RW |
742 | spin_unlock_irq(&dev->power.lock); |
743 | ||
744 | pm_runtime_put(parent); | |
745 | ||
746 | spin_lock_irq(&dev->power.lock); | |
747 | } | |
748 | ||
c3dc2f14 | 749 | trace_rpm_return_int(dev, _THIS_IP_, retval); |
5e928f77 RW |
750 | |
751 | return retval; | |
752 | } | |
753 | ||
5e928f77 | 754 | /** |
62052ab1 | 755 | * pm_runtime_work - Universal runtime PM work function. |
5e928f77 RW |
756 | * @work: Work structure used for scheduling the execution of this function. |
757 | * | |
758 | * Use @work to get the device object the work is to be done for, determine what | |
62052ab1 | 759 | * is to be done and execute the appropriate runtime PM function. |
5e928f77 RW |
760 | */ |
761 | static void pm_runtime_work(struct work_struct *work) | |
762 | { | |
763 | struct device *dev = container_of(work, struct device, power.work); | |
764 | enum rpm_request req; | |
765 | ||
766 | spin_lock_irq(&dev->power.lock); | |
767 | ||
768 | if (!dev->power.request_pending) | |
769 | goto out; | |
770 | ||
771 | req = dev->power.request; | |
772 | dev->power.request = RPM_REQ_NONE; | |
773 | dev->power.request_pending = false; | |
774 | ||
775 | switch (req) { | |
776 | case RPM_REQ_NONE: | |
777 | break; | |
778 | case RPM_REQ_IDLE: | |
140a6c94 | 779 | rpm_idle(dev, RPM_NOWAIT); |
5e928f77 RW |
780 | break; |
781 | case RPM_REQ_SUSPEND: | |
140a6c94 | 782 | rpm_suspend(dev, RPM_NOWAIT); |
5e928f77 | 783 | break; |
15bcb91d AS |
784 | case RPM_REQ_AUTOSUSPEND: |
785 | rpm_suspend(dev, RPM_NOWAIT | RPM_AUTO); | |
786 | break; | |
5e928f77 | 787 | case RPM_REQ_RESUME: |
140a6c94 | 788 | rpm_resume(dev, RPM_NOWAIT); |
5e928f77 RW |
789 | break; |
790 | } | |
791 | ||
792 | out: | |
793 | spin_unlock_irq(&dev->power.lock); | |
794 | } | |
795 | ||
5e928f77 RW |
796 | /** |
797 | * pm_suspend_timer_fn - Timer function for pm_schedule_suspend(). | |
798 | * @data: Device pointer passed by pm_schedule_suspend(). | |
799 | * | |
1bfee5bc | 800 | * Check if the time is right and queue a suspend request. |
5e928f77 RW |
801 | */ |
802 | static void pm_suspend_timer_fn(unsigned long data) | |
803 | { | |
804 | struct device *dev = (struct device *)data; | |
805 | unsigned long flags; | |
806 | unsigned long expires; | |
807 | ||
808 | spin_lock_irqsave(&dev->power.lock, flags); | |
809 | ||
810 | expires = dev->power.timer_expires; | |
811 | /* If 'expire' is after 'jiffies' we've been called too early. */ | |
812 | if (expires > 0 && !time_after(expires, jiffies)) { | |
813 | dev->power.timer_expires = 0; | |
15bcb91d AS |
814 | rpm_suspend(dev, dev->power.timer_autosuspends ? |
815 | (RPM_ASYNC | RPM_AUTO) : RPM_ASYNC); | |
5e928f77 RW |
816 | } |
817 | ||
818 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
819 | } | |
820 | ||
821 | /** | |
822 | * pm_schedule_suspend - Set up a timer to submit a suspend request in future. | |
823 | * @dev: Device to suspend. | |
824 | * @delay: Time to wait before submitting a suspend request, in milliseconds. | |
825 | */ | |
826 | int pm_schedule_suspend(struct device *dev, unsigned int delay) | |
827 | { | |
828 | unsigned long flags; | |
1bfee5bc | 829 | int retval; |
5e928f77 RW |
830 | |
831 | spin_lock_irqsave(&dev->power.lock, flags); | |
832 | ||
5e928f77 | 833 | if (!delay) { |
140a6c94 | 834 | retval = rpm_suspend(dev, RPM_ASYNC); |
5e928f77 RW |
835 | goto out; |
836 | } | |
837 | ||
1bfee5bc | 838 | retval = rpm_check_suspend_allowed(dev); |
5e928f77 RW |
839 | if (retval) |
840 | goto out; | |
841 | ||
1bfee5bc AS |
842 | /* Other scheduled or pending requests need to be canceled. */ |
843 | pm_runtime_cancel_pending(dev); | |
844 | ||
5e928f77 | 845 | dev->power.timer_expires = jiffies + msecs_to_jiffies(delay); |
1bfee5bc | 846 | dev->power.timer_expires += !dev->power.timer_expires; |
15bcb91d | 847 | dev->power.timer_autosuspends = 0; |
5e928f77 RW |
848 | mod_timer(&dev->power.suspend_timer, dev->power.timer_expires); |
849 | ||
850 | out: | |
851 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
852 | ||
853 | return retval; | |
854 | } | |
855 | EXPORT_SYMBOL_GPL(pm_schedule_suspend); | |
856 | ||
5e928f77 | 857 | /** |
62052ab1 | 858 | * __pm_runtime_idle - Entry point for runtime idle operations. |
140a6c94 AS |
859 | * @dev: Device to send idle notification for. |
860 | * @rpmflags: Flag bits. | |
861 | * | |
862 | * If the RPM_GET_PUT flag is set, decrement the device's usage count and | |
863 | * return immediately if it is larger than zero. Then carry out an idle | |
864 | * notification, either synchronous or asynchronous. | |
865 | * | |
311aab73 CC |
866 | * This routine may be called in atomic context if the RPM_ASYNC flag is set, |
867 | * or if pm_runtime_irq_safe() has been called. | |
5e928f77 | 868 | */ |
140a6c94 | 869 | int __pm_runtime_idle(struct device *dev, int rpmflags) |
5e928f77 RW |
870 | { |
871 | unsigned long flags; | |
872 | int retval; | |
873 | ||
311aab73 CC |
874 | might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe); |
875 | ||
140a6c94 AS |
876 | if (rpmflags & RPM_GET_PUT) { |
877 | if (!atomic_dec_and_test(&dev->power.usage_count)) | |
878 | return 0; | |
879 | } | |
880 | ||
5e928f77 | 881 | spin_lock_irqsave(&dev->power.lock, flags); |
140a6c94 | 882 | retval = rpm_idle(dev, rpmflags); |
5e928f77 RW |
883 | spin_unlock_irqrestore(&dev->power.lock, flags); |
884 | ||
885 | return retval; | |
886 | } | |
140a6c94 | 887 | EXPORT_SYMBOL_GPL(__pm_runtime_idle); |
5e928f77 RW |
888 | |
889 | /** | |
62052ab1 | 890 | * __pm_runtime_suspend - Entry point for runtime put/suspend operations. |
140a6c94 | 891 | * @dev: Device to suspend. |
3f9af051 | 892 | * @rpmflags: Flag bits. |
5e928f77 | 893 | * |
15bcb91d AS |
894 | * If the RPM_GET_PUT flag is set, decrement the device's usage count and |
895 | * return immediately if it is larger than zero. Then carry out a suspend, | |
896 | * either synchronous or asynchronous. | |
140a6c94 | 897 | * |
311aab73 CC |
898 | * This routine may be called in atomic context if the RPM_ASYNC flag is set, |
899 | * or if pm_runtime_irq_safe() has been called. | |
5e928f77 | 900 | */ |
140a6c94 | 901 | int __pm_runtime_suspend(struct device *dev, int rpmflags) |
5e928f77 | 902 | { |
140a6c94 | 903 | unsigned long flags; |
1d531c14 | 904 | int retval; |
5e928f77 | 905 | |
311aab73 CC |
906 | might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe); |
907 | ||
15bcb91d AS |
908 | if (rpmflags & RPM_GET_PUT) { |
909 | if (!atomic_dec_and_test(&dev->power.usage_count)) | |
910 | return 0; | |
911 | } | |
912 | ||
140a6c94 AS |
913 | spin_lock_irqsave(&dev->power.lock, flags); |
914 | retval = rpm_suspend(dev, rpmflags); | |
915 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
5e928f77 RW |
916 | |
917 | return retval; | |
918 | } | |
140a6c94 | 919 | EXPORT_SYMBOL_GPL(__pm_runtime_suspend); |
5e928f77 RW |
920 | |
921 | /** | |
62052ab1 | 922 | * __pm_runtime_resume - Entry point for runtime resume operations. |
140a6c94 | 923 | * @dev: Device to resume. |
3f9af051 | 924 | * @rpmflags: Flag bits. |
5e928f77 | 925 | * |
140a6c94 AS |
926 | * If the RPM_GET_PUT flag is set, increment the device's usage count. Then |
927 | * carry out a resume, either synchronous or asynchronous. | |
928 | * | |
311aab73 CC |
929 | * This routine may be called in atomic context if the RPM_ASYNC flag is set, |
930 | * or if pm_runtime_irq_safe() has been called. | |
5e928f77 | 931 | */ |
140a6c94 | 932 | int __pm_runtime_resume(struct device *dev, int rpmflags) |
5e928f77 | 933 | { |
140a6c94 AS |
934 | unsigned long flags; |
935 | int retval; | |
5e928f77 | 936 | |
311aab73 CC |
937 | might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe); |
938 | ||
140a6c94 AS |
939 | if (rpmflags & RPM_GET_PUT) |
940 | atomic_inc(&dev->power.usage_count); | |
941 | ||
942 | spin_lock_irqsave(&dev->power.lock, flags); | |
943 | retval = rpm_resume(dev, rpmflags); | |
944 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
5e928f77 RW |
945 | |
946 | return retval; | |
947 | } | |
140a6c94 | 948 | EXPORT_SYMBOL_GPL(__pm_runtime_resume); |
5e928f77 RW |
949 | |
950 | /** | |
62052ab1 | 951 | * __pm_runtime_set_status - Set runtime PM status of a device. |
5e928f77 | 952 | * @dev: Device to handle. |
62052ab1 | 953 | * @status: New runtime PM status of the device. |
5e928f77 | 954 | * |
62052ab1 | 955 | * If runtime PM of the device is disabled or its power.runtime_error field is |
5e928f77 RW |
956 | * different from zero, the status may be changed either to RPM_ACTIVE, or to |
957 | * RPM_SUSPENDED, as long as that reflects the actual state of the device. | |
958 | * However, if the device has a parent and the parent is not active, and the | |
959 | * parent's power.ignore_children flag is unset, the device's status cannot be | |
960 | * set to RPM_ACTIVE, so -EBUSY is returned in that case. | |
961 | * | |
962 | * If successful, __pm_runtime_set_status() clears the power.runtime_error field | |
963 | * and the device parent's counter of unsuspended children is modified to | |
964 | * reflect the new status. If the new status is RPM_SUSPENDED, an idle | |
965 | * notification request for the parent is submitted. | |
966 | */ | |
967 | int __pm_runtime_set_status(struct device *dev, unsigned int status) | |
968 | { | |
969 | struct device *parent = dev->parent; | |
970 | unsigned long flags; | |
971 | bool notify_parent = false; | |
972 | int error = 0; | |
973 | ||
974 | if (status != RPM_ACTIVE && status != RPM_SUSPENDED) | |
975 | return -EINVAL; | |
976 | ||
977 | spin_lock_irqsave(&dev->power.lock, flags); | |
978 | ||
979 | if (!dev->power.runtime_error && !dev->power.disable_depth) { | |
980 | error = -EAGAIN; | |
981 | goto out; | |
982 | } | |
983 | ||
984 | if (dev->power.runtime_status == status) | |
985 | goto out_set; | |
986 | ||
987 | if (status == RPM_SUSPENDED) { | |
988 | /* It always is possible to set the status to 'suspended'. */ | |
989 | if (parent) { | |
990 | atomic_add_unless(&parent->power.child_count, -1, 0); | |
991 | notify_parent = !parent->power.ignore_children; | |
992 | } | |
993 | goto out_set; | |
994 | } | |
995 | ||
996 | if (parent) { | |
bab636b9 | 997 | spin_lock_nested(&parent->power.lock, SINGLE_DEPTH_NESTING); |
5e928f77 RW |
998 | |
999 | /* | |
1000 | * It is invalid to put an active child under a parent that is | |
62052ab1 | 1001 | * not active, has runtime PM enabled and the |
5e928f77 RW |
1002 | * 'power.ignore_children' flag unset. |
1003 | */ | |
1004 | if (!parent->power.disable_depth | |
1005 | && !parent->power.ignore_children | |
965c4ac0 | 1006 | && parent->power.runtime_status != RPM_ACTIVE) |
5e928f77 | 1007 | error = -EBUSY; |
965c4ac0 RW |
1008 | else if (dev->power.runtime_status == RPM_SUSPENDED) |
1009 | atomic_inc(&parent->power.child_count); | |
5e928f77 | 1010 | |
862f89b3 | 1011 | spin_unlock(&parent->power.lock); |
5e928f77 RW |
1012 | |
1013 | if (error) | |
1014 | goto out; | |
1015 | } | |
1016 | ||
1017 | out_set: | |
8d4b9d1b | 1018 | __update_runtime_status(dev, status); |
5e928f77 RW |
1019 | dev->power.runtime_error = 0; |
1020 | out: | |
1021 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1022 | ||
1023 | if (notify_parent) | |
1024 | pm_request_idle(parent); | |
1025 | ||
1026 | return error; | |
1027 | } | |
1028 | EXPORT_SYMBOL_GPL(__pm_runtime_set_status); | |
1029 | ||
1030 | /** | |
1031 | * __pm_runtime_barrier - Cancel pending requests and wait for completions. | |
1032 | * @dev: Device to handle. | |
1033 | * | |
1034 | * Flush all pending requests for the device from pm_wq and wait for all | |
62052ab1 | 1035 | * runtime PM operations involving the device in progress to complete. |
5e928f77 RW |
1036 | * |
1037 | * Should be called under dev->power.lock with interrupts disabled. | |
1038 | */ | |
1039 | static void __pm_runtime_barrier(struct device *dev) | |
1040 | { | |
1041 | pm_runtime_deactivate_timer(dev); | |
1042 | ||
1043 | if (dev->power.request_pending) { | |
1044 | dev->power.request = RPM_REQ_NONE; | |
1045 | spin_unlock_irq(&dev->power.lock); | |
1046 | ||
1047 | cancel_work_sync(&dev->power.work); | |
1048 | ||
1049 | spin_lock_irq(&dev->power.lock); | |
1050 | dev->power.request_pending = false; | |
1051 | } | |
1052 | ||
1053 | if (dev->power.runtime_status == RPM_SUSPENDING | |
1054 | || dev->power.runtime_status == RPM_RESUMING | |
1055 | || dev->power.idle_notification) { | |
1056 | DEFINE_WAIT(wait); | |
1057 | ||
1058 | /* Suspend, wake-up or idle notification in progress. */ | |
1059 | for (;;) { | |
1060 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
1061 | TASK_UNINTERRUPTIBLE); | |
1062 | if (dev->power.runtime_status != RPM_SUSPENDING | |
1063 | && dev->power.runtime_status != RPM_RESUMING | |
1064 | && !dev->power.idle_notification) | |
1065 | break; | |
1066 | spin_unlock_irq(&dev->power.lock); | |
1067 | ||
1068 | schedule(); | |
1069 | ||
1070 | spin_lock_irq(&dev->power.lock); | |
1071 | } | |
1072 | finish_wait(&dev->power.wait_queue, &wait); | |
1073 | } | |
1074 | } | |
1075 | ||
1076 | /** | |
1077 | * pm_runtime_barrier - Flush pending requests and wait for completions. | |
1078 | * @dev: Device to handle. | |
1079 | * | |
1080 | * Prevent the device from being suspended by incrementing its usage counter and | |
1081 | * if there's a pending resume request for the device, wake the device up. | |
1082 | * Next, make sure that all pending requests for the device have been flushed | |
62052ab1 | 1083 | * from pm_wq and wait for all runtime PM operations involving the device in |
5e928f77 RW |
1084 | * progress to complete. |
1085 | * | |
1086 | * Return value: | |
1087 | * 1, if there was a resume request pending and the device had to be woken up, | |
1088 | * 0, otherwise | |
1089 | */ | |
1090 | int pm_runtime_barrier(struct device *dev) | |
1091 | { | |
1092 | int retval = 0; | |
1093 | ||
1094 | pm_runtime_get_noresume(dev); | |
1095 | spin_lock_irq(&dev->power.lock); | |
1096 | ||
1097 | if (dev->power.request_pending | |
1098 | && dev->power.request == RPM_REQ_RESUME) { | |
140a6c94 | 1099 | rpm_resume(dev, 0); |
5e928f77 RW |
1100 | retval = 1; |
1101 | } | |
1102 | ||
1103 | __pm_runtime_barrier(dev); | |
1104 | ||
1105 | spin_unlock_irq(&dev->power.lock); | |
1106 | pm_runtime_put_noidle(dev); | |
1107 | ||
1108 | return retval; | |
1109 | } | |
1110 | EXPORT_SYMBOL_GPL(pm_runtime_barrier); | |
1111 | ||
1112 | /** | |
62052ab1 | 1113 | * __pm_runtime_disable - Disable runtime PM of a device. |
5e928f77 RW |
1114 | * @dev: Device to handle. |
1115 | * @check_resume: If set, check if there's a resume request for the device. | |
1116 | * | |
1117 | * Increment power.disable_depth for the device and if was zero previously, | |
62052ab1 | 1118 | * cancel all pending runtime PM requests for the device and wait for all |
5e928f77 | 1119 | * operations in progress to complete. The device can be either active or |
62052ab1 | 1120 | * suspended after its runtime PM has been disabled. |
5e928f77 RW |
1121 | * |
1122 | * If @check_resume is set and there's a resume request pending when | |
1123 | * __pm_runtime_disable() is called and power.disable_depth is zero, the | |
62052ab1 | 1124 | * function will wake up the device before disabling its runtime PM. |
5e928f77 RW |
1125 | */ |
1126 | void __pm_runtime_disable(struct device *dev, bool check_resume) | |
1127 | { | |
1128 | spin_lock_irq(&dev->power.lock); | |
1129 | ||
1130 | if (dev->power.disable_depth > 0) { | |
1131 | dev->power.disable_depth++; | |
1132 | goto out; | |
1133 | } | |
1134 | ||
1135 | /* | |
1136 | * Wake up the device if there's a resume request pending, because that | |
62052ab1 | 1137 | * means there probably is some I/O to process and disabling runtime PM |
5e928f77 RW |
1138 | * shouldn't prevent the device from processing the I/O. |
1139 | */ | |
1140 | if (check_resume && dev->power.request_pending | |
1141 | && dev->power.request == RPM_REQ_RESUME) { | |
1142 | /* | |
1143 | * Prevent suspends and idle notifications from being carried | |
1144 | * out after we have woken up the device. | |
1145 | */ | |
1146 | pm_runtime_get_noresume(dev); | |
1147 | ||
140a6c94 | 1148 | rpm_resume(dev, 0); |
5e928f77 RW |
1149 | |
1150 | pm_runtime_put_noidle(dev); | |
1151 | } | |
1152 | ||
1153 | if (!dev->power.disable_depth++) | |
1154 | __pm_runtime_barrier(dev); | |
1155 | ||
1156 | out: | |
1157 | spin_unlock_irq(&dev->power.lock); | |
1158 | } | |
1159 | EXPORT_SYMBOL_GPL(__pm_runtime_disable); | |
1160 | ||
1161 | /** | |
62052ab1 | 1162 | * pm_runtime_enable - Enable runtime PM of a device. |
5e928f77 RW |
1163 | * @dev: Device to handle. |
1164 | */ | |
1165 | void pm_runtime_enable(struct device *dev) | |
1166 | { | |
1167 | unsigned long flags; | |
1168 | ||
1169 | spin_lock_irqsave(&dev->power.lock, flags); | |
1170 | ||
1171 | if (dev->power.disable_depth > 0) | |
1172 | dev->power.disable_depth--; | |
1173 | else | |
1174 | dev_warn(dev, "Unbalanced %s!\n", __func__); | |
1175 | ||
1176 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1177 | } | |
1178 | EXPORT_SYMBOL_GPL(pm_runtime_enable); | |
1179 | ||
53823639 | 1180 | /** |
62052ab1 | 1181 | * pm_runtime_forbid - Block runtime PM of a device. |
53823639 RW |
1182 | * @dev: Device to handle. |
1183 | * | |
1184 | * Increase the device's usage count and clear its power.runtime_auto flag, | |
1185 | * so that it cannot be suspended at run time until pm_runtime_allow() is called | |
1186 | * for it. | |
1187 | */ | |
1188 | void pm_runtime_forbid(struct device *dev) | |
1189 | { | |
1190 | spin_lock_irq(&dev->power.lock); | |
1191 | if (!dev->power.runtime_auto) | |
1192 | goto out; | |
1193 | ||
1194 | dev->power.runtime_auto = false; | |
1195 | atomic_inc(&dev->power.usage_count); | |
140a6c94 | 1196 | rpm_resume(dev, 0); |
53823639 RW |
1197 | |
1198 | out: | |
1199 | spin_unlock_irq(&dev->power.lock); | |
1200 | } | |
1201 | EXPORT_SYMBOL_GPL(pm_runtime_forbid); | |
1202 | ||
1203 | /** | |
62052ab1 | 1204 | * pm_runtime_allow - Unblock runtime PM of a device. |
53823639 RW |
1205 | * @dev: Device to handle. |
1206 | * | |
1207 | * Decrease the device's usage count and set its power.runtime_auto flag. | |
1208 | */ | |
1209 | void pm_runtime_allow(struct device *dev) | |
1210 | { | |
1211 | spin_lock_irq(&dev->power.lock); | |
1212 | if (dev->power.runtime_auto) | |
1213 | goto out; | |
1214 | ||
1215 | dev->power.runtime_auto = true; | |
1216 | if (atomic_dec_and_test(&dev->power.usage_count)) | |
15bcb91d | 1217 | rpm_idle(dev, RPM_AUTO); |
53823639 RW |
1218 | |
1219 | out: | |
1220 | spin_unlock_irq(&dev->power.lock); | |
1221 | } | |
1222 | EXPORT_SYMBOL_GPL(pm_runtime_allow); | |
1223 | ||
7490e442 | 1224 | /** |
62052ab1 | 1225 | * pm_runtime_no_callbacks - Ignore runtime PM callbacks for a device. |
7490e442 AS |
1226 | * @dev: Device to handle. |
1227 | * | |
1228 | * Set the power.no_callbacks flag, which tells the PM core that this | |
62052ab1 RW |
1229 | * device is power-managed through its parent and has no runtime PM |
1230 | * callbacks of its own. The runtime sysfs attributes will be removed. | |
7490e442 AS |
1231 | */ |
1232 | void pm_runtime_no_callbacks(struct device *dev) | |
1233 | { | |
1234 | spin_lock_irq(&dev->power.lock); | |
1235 | dev->power.no_callbacks = 1; | |
1236 | spin_unlock_irq(&dev->power.lock); | |
1237 | if (device_is_registered(dev)) | |
1238 | rpm_sysfs_remove(dev); | |
1239 | } | |
1240 | EXPORT_SYMBOL_GPL(pm_runtime_no_callbacks); | |
1241 | ||
c7b61de5 AS |
1242 | /** |
1243 | * pm_runtime_irq_safe - Leave interrupts disabled during callbacks. | |
1244 | * @dev: Device to handle | |
1245 | * | |
1246 | * Set the power.irq_safe flag, which tells the PM core that the | |
1247 | * ->runtime_suspend() and ->runtime_resume() callbacks for this device should | |
1248 | * always be invoked with the spinlock held and interrupts disabled. It also | |
1249 | * causes the parent's usage counter to be permanently incremented, preventing | |
1250 | * the parent from runtime suspending -- otherwise an irq-safe child might have | |
1251 | * to wait for a non-irq-safe parent. | |
1252 | */ | |
1253 | void pm_runtime_irq_safe(struct device *dev) | |
1254 | { | |
1255 | if (dev->parent) | |
1256 | pm_runtime_get_sync(dev->parent); | |
1257 | spin_lock_irq(&dev->power.lock); | |
1258 | dev->power.irq_safe = 1; | |
1259 | spin_unlock_irq(&dev->power.lock); | |
1260 | } | |
1261 | EXPORT_SYMBOL_GPL(pm_runtime_irq_safe); | |
1262 | ||
15bcb91d AS |
1263 | /** |
1264 | * update_autosuspend - Handle a change to a device's autosuspend settings. | |
1265 | * @dev: Device to handle. | |
1266 | * @old_delay: The former autosuspend_delay value. | |
1267 | * @old_use: The former use_autosuspend value. | |
1268 | * | |
1269 | * Prevent runtime suspend if the new delay is negative and use_autosuspend is | |
1270 | * set; otherwise allow it. Send an idle notification if suspends are allowed. | |
1271 | * | |
1272 | * This function must be called under dev->power.lock with interrupts disabled. | |
1273 | */ | |
1274 | static void update_autosuspend(struct device *dev, int old_delay, int old_use) | |
1275 | { | |
1276 | int delay = dev->power.autosuspend_delay; | |
1277 | ||
1278 | /* Should runtime suspend be prevented now? */ | |
1279 | if (dev->power.use_autosuspend && delay < 0) { | |
1280 | ||
1281 | /* If it used to be allowed then prevent it. */ | |
1282 | if (!old_use || old_delay >= 0) { | |
1283 | atomic_inc(&dev->power.usage_count); | |
1284 | rpm_resume(dev, 0); | |
1285 | } | |
1286 | } | |
1287 | ||
1288 | /* Runtime suspend should be allowed now. */ | |
1289 | else { | |
1290 | ||
1291 | /* If it used to be prevented then allow it. */ | |
1292 | if (old_use && old_delay < 0) | |
1293 | atomic_dec(&dev->power.usage_count); | |
1294 | ||
1295 | /* Maybe we can autosuspend now. */ | |
1296 | rpm_idle(dev, RPM_AUTO); | |
1297 | } | |
1298 | } | |
1299 | ||
1300 | /** | |
1301 | * pm_runtime_set_autosuspend_delay - Set a device's autosuspend_delay value. | |
1302 | * @dev: Device to handle. | |
1303 | * @delay: Value of the new delay in milliseconds. | |
1304 | * | |
1305 | * Set the device's power.autosuspend_delay value. If it changes to negative | |
62052ab1 RW |
1306 | * and the power.use_autosuspend flag is set, prevent runtime suspends. If it |
1307 | * changes the other way, allow runtime suspends. | |
15bcb91d AS |
1308 | */ |
1309 | void pm_runtime_set_autosuspend_delay(struct device *dev, int delay) | |
1310 | { | |
1311 | int old_delay, old_use; | |
1312 | ||
1313 | spin_lock_irq(&dev->power.lock); | |
1314 | old_delay = dev->power.autosuspend_delay; | |
1315 | old_use = dev->power.use_autosuspend; | |
1316 | dev->power.autosuspend_delay = delay; | |
1317 | update_autosuspend(dev, old_delay, old_use); | |
1318 | spin_unlock_irq(&dev->power.lock); | |
1319 | } | |
1320 | EXPORT_SYMBOL_GPL(pm_runtime_set_autosuspend_delay); | |
1321 | ||
1322 | /** | |
1323 | * __pm_runtime_use_autosuspend - Set a device's use_autosuspend flag. | |
1324 | * @dev: Device to handle. | |
1325 | * @use: New value for use_autosuspend. | |
1326 | * | |
62052ab1 | 1327 | * Set the device's power.use_autosuspend flag, and allow or prevent runtime |
15bcb91d AS |
1328 | * suspends as needed. |
1329 | */ | |
1330 | void __pm_runtime_use_autosuspend(struct device *dev, bool use) | |
1331 | { | |
1332 | int old_delay, old_use; | |
1333 | ||
1334 | spin_lock_irq(&dev->power.lock); | |
1335 | old_delay = dev->power.autosuspend_delay; | |
1336 | old_use = dev->power.use_autosuspend; | |
1337 | dev->power.use_autosuspend = use; | |
1338 | update_autosuspend(dev, old_delay, old_use); | |
1339 | spin_unlock_irq(&dev->power.lock); | |
1340 | } | |
1341 | EXPORT_SYMBOL_GPL(__pm_runtime_use_autosuspend); | |
1342 | ||
5e928f77 | 1343 | /** |
62052ab1 | 1344 | * pm_runtime_init - Initialize runtime PM fields in given device object. |
5e928f77 RW |
1345 | * @dev: Device object to initialize. |
1346 | */ | |
1347 | void pm_runtime_init(struct device *dev) | |
1348 | { | |
5e928f77 RW |
1349 | dev->power.runtime_status = RPM_SUSPENDED; |
1350 | dev->power.idle_notification = false; | |
1351 | ||
1352 | dev->power.disable_depth = 1; | |
1353 | atomic_set(&dev->power.usage_count, 0); | |
1354 | ||
1355 | dev->power.runtime_error = 0; | |
1356 | ||
1357 | atomic_set(&dev->power.child_count, 0); | |
1358 | pm_suspend_ignore_children(dev, false); | |
53823639 | 1359 | dev->power.runtime_auto = true; |
5e928f77 RW |
1360 | |
1361 | dev->power.request_pending = false; | |
1362 | dev->power.request = RPM_REQ_NONE; | |
1363 | dev->power.deferred_resume = false; | |
8d4b9d1b | 1364 | dev->power.accounting_timestamp = jiffies; |
5e928f77 RW |
1365 | INIT_WORK(&dev->power.work, pm_runtime_work); |
1366 | ||
1367 | dev->power.timer_expires = 0; | |
1368 | setup_timer(&dev->power.suspend_timer, pm_suspend_timer_fn, | |
1369 | (unsigned long)dev); | |
1370 | ||
00dc9ad1 RW |
1371 | dev->power.suspend_time = ktime_set(0, 0); |
1372 | dev->power.max_time_suspended_ns = -1; | |
1373 | ||
5e928f77 RW |
1374 | init_waitqueue_head(&dev->power.wait_queue); |
1375 | } | |
1376 | ||
1377 | /** | |
1378 | * pm_runtime_remove - Prepare for removing a device from device hierarchy. | |
1379 | * @dev: Device object being removed from device hierarchy. | |
1380 | */ | |
1381 | void pm_runtime_remove(struct device *dev) | |
1382 | { | |
1383 | __pm_runtime_disable(dev, false); | |
1384 | ||
1385 | /* Change the status back to 'suspended' to match the initial status. */ | |
1386 | if (dev->power.runtime_status == RPM_ACTIVE) | |
1387 | pm_runtime_set_suspended(dev); | |
c7b61de5 AS |
1388 | if (dev->power.irq_safe && dev->parent) |
1389 | pm_runtime_put_sync(dev->parent); | |
5e928f77 | 1390 | } |
00dc9ad1 RW |
1391 | |
1392 | /** | |
1393 | * pm_runtime_update_max_time_suspended - Update device's suspend time data. | |
1394 | * @dev: Device to handle. | |
1395 | * @delta_ns: Value to subtract from the device's max_time_suspended_ns field. | |
1396 | * | |
1397 | * Update the device's power.max_time_suspended_ns field by subtracting | |
1398 | * @delta_ns from it. The resulting value of power.max_time_suspended_ns is | |
1399 | * never negative. | |
1400 | */ | |
1401 | void pm_runtime_update_max_time_suspended(struct device *dev, s64 delta_ns) | |
1402 | { | |
1403 | unsigned long flags; | |
1404 | ||
1405 | spin_lock_irqsave(&dev->power.lock, flags); | |
1406 | ||
1407 | if (delta_ns > 0 && dev->power.max_time_suspended_ns > 0) { | |
1408 | if (dev->power.max_time_suspended_ns > delta_ns) | |
1409 | dev->power.max_time_suspended_ns -= delta_ns; | |
1410 | else | |
1411 | dev->power.max_time_suspended_ns = 0; | |
1412 | } | |
1413 | ||
1414 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1415 | } |