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; | |
55d7ec45 RW |
150 | else if (__dev_pm_qos_read_value(dev) < 0) |
151 | retval = -EPERM; | |
1bfee5bc AS |
152 | else if (dev->power.runtime_status == RPM_SUSPENDED) |
153 | retval = 1; | |
154 | ||
155 | return retval; | |
156 | } | |
157 | ||
ad3c36a5 RW |
158 | /** |
159 | * __rpm_callback - Run a given runtime PM callback for a given device. | |
160 | * @cb: Runtime PM callback to run. | |
161 | * @dev: Device to run the callback for. | |
162 | */ | |
163 | static int __rpm_callback(int (*cb)(struct device *), struct device *dev) | |
164 | __releases(&dev->power.lock) __acquires(&dev->power.lock) | |
165 | { | |
166 | int retval; | |
167 | ||
168 | if (dev->power.irq_safe) | |
169 | spin_unlock(&dev->power.lock); | |
170 | else | |
171 | spin_unlock_irq(&dev->power.lock); | |
172 | ||
173 | retval = cb(dev); | |
174 | ||
175 | if (dev->power.irq_safe) | |
176 | spin_lock(&dev->power.lock); | |
177 | else | |
178 | spin_lock_irq(&dev->power.lock); | |
179 | ||
180 | return retval; | |
181 | } | |
182 | ||
1bfee5bc | 183 | /** |
140a6c94 | 184 | * rpm_idle - Notify device bus type if the device can be suspended. |
1bfee5bc AS |
185 | * @dev: Device to notify the bus type about. |
186 | * @rpmflags: Flag bits. | |
187 | * | |
62052ab1 | 188 | * Check if the device's runtime PM status allows it to be suspended. If |
1bfee5bc AS |
189 | * another idle notification has been started earlier, return immediately. If |
190 | * the RPM_ASYNC flag is set then queue an idle-notification request; otherwise | |
191 | * run the ->runtime_idle() callback directly. | |
192 | * | |
193 | * This function must be called under dev->power.lock with interrupts disabled. | |
194 | */ | |
140a6c94 | 195 | static int rpm_idle(struct device *dev, int rpmflags) |
1bfee5bc | 196 | { |
71c63122 | 197 | int (*callback)(struct device *); |
1bfee5bc AS |
198 | int retval; |
199 | ||
c3dc2f14 | 200 | trace_rpm_idle(dev, rpmflags); |
1bfee5bc AS |
201 | retval = rpm_check_suspend_allowed(dev); |
202 | if (retval < 0) | |
203 | ; /* Conditions are wrong. */ | |
204 | ||
205 | /* Idle notifications are allowed only in the RPM_ACTIVE state. */ | |
206 | else if (dev->power.runtime_status != RPM_ACTIVE) | |
207 | retval = -EAGAIN; | |
208 | ||
209 | /* | |
210 | * Any pending request other than an idle notification takes | |
211 | * precedence over us, except that the timer may be running. | |
212 | */ | |
213 | else if (dev->power.request_pending && | |
214 | dev->power.request > RPM_REQ_IDLE) | |
215 | retval = -EAGAIN; | |
216 | ||
217 | /* Act as though RPM_NOWAIT is always set. */ | |
218 | else if (dev->power.idle_notification) | |
219 | retval = -EINPROGRESS; | |
5e928f77 RW |
220 | if (retval) |
221 | goto out; | |
222 | ||
1bfee5bc AS |
223 | /* Pending requests need to be canceled. */ |
224 | dev->power.request = RPM_REQ_NONE; | |
225 | ||
7490e442 AS |
226 | if (dev->power.no_callbacks) { |
227 | /* Assume ->runtime_idle() callback would have suspended. */ | |
228 | retval = rpm_suspend(dev, rpmflags); | |
229 | goto out; | |
230 | } | |
231 | ||
1bfee5bc AS |
232 | /* Carry out an asynchronous or a synchronous idle notification. */ |
233 | if (rpmflags & RPM_ASYNC) { | |
234 | dev->power.request = RPM_REQ_IDLE; | |
235 | if (!dev->power.request_pending) { | |
236 | dev->power.request_pending = true; | |
237 | queue_work(pm_wq, &dev->power.work); | |
5e928f77 | 238 | } |
1bfee5bc | 239 | goto out; |
5e928f77 RW |
240 | } |
241 | ||
242 | dev->power.idle_notification = true; | |
243 | ||
564b905a RW |
244 | if (dev->pm_domain) |
245 | callback = dev->pm_domain->ops.runtime_idle; | |
4d27e9dc | 246 | else if (dev->type && dev->type->pm) |
71c63122 RW |
247 | callback = dev->type->pm->runtime_idle; |
248 | else if (dev->class && dev->class->pm) | |
249 | callback = dev->class->pm->runtime_idle; | |
9659cc06 RW |
250 | else if (dev->bus && dev->bus->pm) |
251 | callback = dev->bus->pm->runtime_idle; | |
71c63122 RW |
252 | else |
253 | callback = NULL; | |
a6ab7aa9 | 254 | |
35cd133c RW |
255 | if (!callback && dev->driver && dev->driver->pm) |
256 | callback = dev->driver->pm->runtime_idle; | |
257 | ||
ad3c36a5 RW |
258 | if (callback) |
259 | __rpm_callback(callback, dev); | |
5e928f77 RW |
260 | |
261 | dev->power.idle_notification = false; | |
262 | wake_up_all(&dev->power.wait_queue); | |
263 | ||
264 | out: | |
c3dc2f14 | 265 | trace_rpm_return_int(dev, _THIS_IP_, retval); |
5e928f77 RW |
266 | return retval; |
267 | } | |
268 | ||
71c63122 RW |
269 | /** |
270 | * rpm_callback - Run a given runtime PM callback for a given device. | |
271 | * @cb: Runtime PM callback to run. | |
272 | * @dev: Device to run the callback for. | |
273 | */ | |
274 | static int rpm_callback(int (*cb)(struct device *), struct device *dev) | |
71c63122 RW |
275 | { |
276 | int retval; | |
277 | ||
278 | if (!cb) | |
279 | return -ENOSYS; | |
280 | ||
ad3c36a5 | 281 | retval = __rpm_callback(cb, dev); |
71c63122 | 282 | |
71c63122 | 283 | dev->power.runtime_error = retval; |
632e270e | 284 | return retval != -EACCES ? retval : -EIO; |
71c63122 RW |
285 | } |
286 | ||
5e928f77 | 287 | /** |
62052ab1 | 288 | * rpm_suspend - Carry out runtime suspend of given device. |
5e928f77 | 289 | * @dev: Device to suspend. |
3f9af051 | 290 | * @rpmflags: Flag bits. |
5e928f77 | 291 | * |
47d8f0ba ML |
292 | * Check if the device's runtime PM status allows it to be suspended. |
293 | * Cancel a pending idle notification, autosuspend or suspend. If | |
294 | * another suspend has been started earlier, either return immediately | |
295 | * or wait for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC | |
296 | * flags. If the RPM_ASYNC flag is set then queue a suspend request; | |
857b36c7 ML |
297 | * otherwise run the ->runtime_suspend() callback directly. When |
298 | * ->runtime_suspend succeeded, if a deferred resume was requested while | |
299 | * the callback was running then carry it out, otherwise send an idle | |
300 | * notification for its parent (if the suspend succeeded and both | |
301 | * ignore_children of parent->power and irq_safe of dev->power are not set). | |
886486b7 AS |
302 | * If ->runtime_suspend failed with -EAGAIN or -EBUSY, and if the RPM_AUTO |
303 | * flag is set and the next autosuspend-delay expiration time is in the | |
304 | * future, schedule another autosuspend attempt. | |
5e928f77 RW |
305 | * |
306 | * This function must be called under dev->power.lock with interrupts disabled. | |
307 | */ | |
140a6c94 | 308 | static int rpm_suspend(struct device *dev, int rpmflags) |
5e928f77 RW |
309 | __releases(&dev->power.lock) __acquires(&dev->power.lock) |
310 | { | |
71c63122 | 311 | int (*callback)(struct device *); |
5e928f77 | 312 | struct device *parent = NULL; |
1bfee5bc | 313 | int retval; |
5e928f77 | 314 | |
c3dc2f14 | 315 | trace_rpm_suspend(dev, rpmflags); |
5e928f77 RW |
316 | |
317 | repeat: | |
1bfee5bc | 318 | retval = rpm_check_suspend_allowed(dev); |
5e928f77 | 319 | |
1bfee5bc AS |
320 | if (retval < 0) |
321 | ; /* Conditions are wrong. */ | |
322 | ||
323 | /* Synchronous suspends are not allowed in the RPM_RESUMING state. */ | |
324 | else if (dev->power.runtime_status == RPM_RESUMING && | |
325 | !(rpmflags & RPM_ASYNC)) | |
5e928f77 | 326 | retval = -EAGAIN; |
1bfee5bc | 327 | if (retval) |
5e928f77 | 328 | goto out; |
5e928f77 | 329 | |
15bcb91d AS |
330 | /* If the autosuspend_delay time hasn't expired yet, reschedule. */ |
331 | if ((rpmflags & RPM_AUTO) | |
332 | && dev->power.runtime_status != RPM_SUSPENDING) { | |
333 | unsigned long expires = pm_runtime_autosuspend_expiration(dev); | |
334 | ||
335 | if (expires != 0) { | |
336 | /* Pending requests need to be canceled. */ | |
337 | dev->power.request = RPM_REQ_NONE; | |
338 | ||
339 | /* | |
340 | * Optimization: If the timer is already running and is | |
341 | * set to expire at or before the autosuspend delay, | |
342 | * avoid the overhead of resetting it. Just let it | |
343 | * expire; pm_suspend_timer_fn() will take care of the | |
344 | * rest. | |
345 | */ | |
346 | if (!(dev->power.timer_expires && time_before_eq( | |
347 | dev->power.timer_expires, expires))) { | |
348 | dev->power.timer_expires = expires; | |
349 | mod_timer(&dev->power.suspend_timer, expires); | |
350 | } | |
351 | dev->power.timer_autosuspends = 1; | |
352 | goto out; | |
353 | } | |
354 | } | |
355 | ||
5e928f77 RW |
356 | /* Other scheduled or pending requests need to be canceled. */ |
357 | pm_runtime_cancel_pending(dev); | |
358 | ||
5e928f77 RW |
359 | if (dev->power.runtime_status == RPM_SUSPENDING) { |
360 | DEFINE_WAIT(wait); | |
361 | ||
1bfee5bc | 362 | if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) { |
5e928f77 RW |
363 | retval = -EINPROGRESS; |
364 | goto out; | |
365 | } | |
366 | ||
ad3c36a5 RW |
367 | if (dev->power.irq_safe) { |
368 | spin_unlock(&dev->power.lock); | |
369 | ||
370 | cpu_relax(); | |
371 | ||
372 | spin_lock(&dev->power.lock); | |
373 | goto repeat; | |
374 | } | |
375 | ||
5e928f77 RW |
376 | /* Wait for the other suspend running in parallel with us. */ |
377 | for (;;) { | |
378 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
379 | TASK_UNINTERRUPTIBLE); | |
380 | if (dev->power.runtime_status != RPM_SUSPENDING) | |
381 | break; | |
382 | ||
383 | spin_unlock_irq(&dev->power.lock); | |
384 | ||
385 | schedule(); | |
386 | ||
387 | spin_lock_irq(&dev->power.lock); | |
388 | } | |
389 | finish_wait(&dev->power.wait_queue, &wait); | |
390 | goto repeat; | |
391 | } | |
392 | ||
7490e442 AS |
393 | if (dev->power.no_callbacks) |
394 | goto no_callback; /* Assume success. */ | |
395 | ||
1bfee5bc AS |
396 | /* Carry out an asynchronous or a synchronous suspend. */ |
397 | if (rpmflags & RPM_ASYNC) { | |
15bcb91d AS |
398 | dev->power.request = (rpmflags & RPM_AUTO) ? |
399 | RPM_REQ_AUTOSUSPEND : RPM_REQ_SUSPEND; | |
1bfee5bc AS |
400 | if (!dev->power.request_pending) { |
401 | dev->power.request_pending = true; | |
402 | queue_work(pm_wq, &dev->power.work); | |
403 | } | |
404 | goto out; | |
405 | } | |
406 | ||
8d4b9d1b | 407 | __update_runtime_status(dev, RPM_SUSPENDING); |
5e928f77 | 408 | |
564b905a RW |
409 | if (dev->pm_domain) |
410 | callback = dev->pm_domain->ops.runtime_suspend; | |
4d27e9dc | 411 | else if (dev->type && dev->type->pm) |
71c63122 RW |
412 | callback = dev->type->pm->runtime_suspend; |
413 | else if (dev->class && dev->class->pm) | |
414 | callback = dev->class->pm->runtime_suspend; | |
9659cc06 RW |
415 | else if (dev->bus && dev->bus->pm) |
416 | callback = dev->bus->pm->runtime_suspend; | |
71c63122 RW |
417 | else |
418 | callback = NULL; | |
5e928f77 | 419 | |
35cd133c RW |
420 | if (!callback && dev->driver && dev->driver->pm) |
421 | callback = dev->driver->pm->runtime_suspend; | |
422 | ||
71c63122 | 423 | retval = rpm_callback(callback, dev); |
00dc9ad1 RW |
424 | if (retval) |
425 | goto fail; | |
886486b7 | 426 | |
7490e442 | 427 | no_callback: |
857b36c7 ML |
428 | __update_runtime_status(dev, RPM_SUSPENDED); |
429 | pm_runtime_deactivate_timer(dev); | |
5e928f77 | 430 | |
857b36c7 ML |
431 | if (dev->parent) { |
432 | parent = dev->parent; | |
433 | atomic_add_unless(&parent->power.child_count, -1, 0); | |
5e928f77 RW |
434 | } |
435 | wake_up_all(&dev->power.wait_queue); | |
436 | ||
437 | if (dev->power.deferred_resume) { | |
58a34de7 | 438 | dev->power.deferred_resume = false; |
140a6c94 | 439 | rpm_resume(dev, 0); |
5e928f77 RW |
440 | retval = -EAGAIN; |
441 | goto out; | |
442 | } | |
443 | ||
c3810c88 | 444 | /* Maybe the parent is now able to suspend. */ |
c7b61de5 | 445 | if (parent && !parent->power.ignore_children && !dev->power.irq_safe) { |
c3810c88 | 446 | spin_unlock(&dev->power.lock); |
5e928f77 | 447 | |
c3810c88 AS |
448 | spin_lock(&parent->power.lock); |
449 | rpm_idle(parent, RPM_ASYNC); | |
450 | spin_unlock(&parent->power.lock); | |
5e928f77 | 451 | |
c3810c88 | 452 | spin_lock(&dev->power.lock); |
5e928f77 RW |
453 | } |
454 | ||
455 | out: | |
c3dc2f14 | 456 | trace_rpm_return_int(dev, _THIS_IP_, retval); |
5e928f77 RW |
457 | |
458 | return retval; | |
00dc9ad1 RW |
459 | |
460 | fail: | |
461 | __update_runtime_status(dev, RPM_ACTIVE); | |
00dc9ad1 | 462 | dev->power.deferred_resume = false; |
f2791d73 AS |
463 | wake_up_all(&dev->power.wait_queue); |
464 | ||
00dc9ad1 RW |
465 | if (retval == -EAGAIN || retval == -EBUSY) { |
466 | dev->power.runtime_error = 0; | |
467 | ||
468 | /* | |
469 | * If the callback routine failed an autosuspend, and | |
470 | * if the last_busy time has been updated so that there | |
471 | * is a new autosuspend expiration time, automatically | |
472 | * reschedule another autosuspend. | |
473 | */ | |
474 | if ((rpmflags & RPM_AUTO) && | |
475 | pm_runtime_autosuspend_expiration(dev) != 0) | |
476 | goto repeat; | |
477 | } else { | |
478 | pm_runtime_cancel_pending(dev); | |
479 | } | |
00dc9ad1 | 480 | goto out; |
5e928f77 RW |
481 | } |
482 | ||
483 | /** | |
62052ab1 | 484 | * rpm_resume - Carry out runtime resume of given device. |
5e928f77 | 485 | * @dev: Device to resume. |
3f9af051 | 486 | * @rpmflags: Flag bits. |
5e928f77 | 487 | * |
62052ab1 | 488 | * Check if the device's runtime PM status allows it to be resumed. Cancel |
1bfee5bc | 489 | * any scheduled or pending requests. If another resume has been started |
25985edc | 490 | * earlier, either return immediately or wait for it to finish, depending on the |
1bfee5bc AS |
491 | * RPM_NOWAIT and RPM_ASYNC flags. Similarly, if there's a suspend running in |
492 | * parallel with this function, either tell the other process to resume after | |
493 | * suspending (deferred_resume) or wait for it to finish. If the RPM_ASYNC | |
494 | * flag is set then queue a resume request; otherwise run the | |
495 | * ->runtime_resume() callback directly. Queue an idle notification for the | |
496 | * device if the resume succeeded. | |
5e928f77 RW |
497 | * |
498 | * This function must be called under dev->power.lock with interrupts disabled. | |
499 | */ | |
140a6c94 | 500 | static int rpm_resume(struct device *dev, int rpmflags) |
5e928f77 RW |
501 | __releases(&dev->power.lock) __acquires(&dev->power.lock) |
502 | { | |
71c63122 | 503 | int (*callback)(struct device *); |
5e928f77 RW |
504 | struct device *parent = NULL; |
505 | int retval = 0; | |
506 | ||
c3dc2f14 | 507 | trace_rpm_resume(dev, rpmflags); |
5e928f77 RW |
508 | |
509 | repeat: | |
1bfee5bc | 510 | if (dev->power.runtime_error) |
5e928f77 | 511 | retval = -EINVAL; |
1bfee5bc | 512 | else if (dev->power.disable_depth > 0) |
632e270e | 513 | retval = -EACCES; |
1bfee5bc | 514 | if (retval) |
5e928f77 | 515 | goto out; |
5e928f77 | 516 | |
15bcb91d AS |
517 | /* |
518 | * Other scheduled or pending requests need to be canceled. Small | |
519 | * optimization: If an autosuspend timer is running, leave it running | |
520 | * rather than cancelling it now only to restart it again in the near | |
521 | * future. | |
522 | */ | |
523 | dev->power.request = RPM_REQ_NONE; | |
524 | if (!dev->power.timer_autosuspends) | |
525 | pm_runtime_deactivate_timer(dev); | |
5e928f77 | 526 | |
1bfee5bc | 527 | if (dev->power.runtime_status == RPM_ACTIVE) { |
5e928f77 | 528 | retval = 1; |
5e928f77 | 529 | goto out; |
1bfee5bc | 530 | } |
5e928f77 RW |
531 | |
532 | if (dev->power.runtime_status == RPM_RESUMING | |
533 | || dev->power.runtime_status == RPM_SUSPENDING) { | |
534 | DEFINE_WAIT(wait); | |
535 | ||
1bfee5bc | 536 | if (rpmflags & (RPM_ASYNC | RPM_NOWAIT)) { |
5e928f77 RW |
537 | if (dev->power.runtime_status == RPM_SUSPENDING) |
538 | dev->power.deferred_resume = true; | |
1bfee5bc AS |
539 | else |
540 | retval = -EINPROGRESS; | |
5e928f77 RW |
541 | goto out; |
542 | } | |
543 | ||
ad3c36a5 RW |
544 | if (dev->power.irq_safe) { |
545 | spin_unlock(&dev->power.lock); | |
546 | ||
547 | cpu_relax(); | |
548 | ||
549 | spin_lock(&dev->power.lock); | |
550 | goto repeat; | |
551 | } | |
552 | ||
5e928f77 RW |
553 | /* Wait for the operation carried out in parallel with us. */ |
554 | for (;;) { | |
555 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
556 | TASK_UNINTERRUPTIBLE); | |
557 | if (dev->power.runtime_status != RPM_RESUMING | |
558 | && dev->power.runtime_status != RPM_SUSPENDING) | |
559 | break; | |
560 | ||
561 | spin_unlock_irq(&dev->power.lock); | |
562 | ||
563 | schedule(); | |
564 | ||
565 | spin_lock_irq(&dev->power.lock); | |
566 | } | |
567 | finish_wait(&dev->power.wait_queue, &wait); | |
568 | goto repeat; | |
569 | } | |
570 | ||
7490e442 AS |
571 | /* |
572 | * See if we can skip waking up the parent. This is safe only if | |
573 | * power.no_callbacks is set, because otherwise we don't know whether | |
574 | * the resume will actually succeed. | |
575 | */ | |
576 | if (dev->power.no_callbacks && !parent && dev->parent) { | |
d63be5f9 | 577 | spin_lock_nested(&dev->parent->power.lock, SINGLE_DEPTH_NESTING); |
7490e442 AS |
578 | if (dev->parent->power.disable_depth > 0 |
579 | || dev->parent->power.ignore_children | |
580 | || dev->parent->power.runtime_status == RPM_ACTIVE) { | |
581 | atomic_inc(&dev->parent->power.child_count); | |
582 | spin_unlock(&dev->parent->power.lock); | |
7f321c26 | 583 | retval = 1; |
7490e442 AS |
584 | goto no_callback; /* Assume success. */ |
585 | } | |
586 | spin_unlock(&dev->parent->power.lock); | |
587 | } | |
588 | ||
1bfee5bc AS |
589 | /* Carry out an asynchronous or a synchronous resume. */ |
590 | if (rpmflags & RPM_ASYNC) { | |
591 | dev->power.request = RPM_REQ_RESUME; | |
592 | if (!dev->power.request_pending) { | |
593 | dev->power.request_pending = true; | |
594 | queue_work(pm_wq, &dev->power.work); | |
595 | } | |
596 | retval = 0; | |
597 | goto out; | |
598 | } | |
599 | ||
5e928f77 RW |
600 | if (!parent && dev->parent) { |
601 | /* | |
c7b61de5 AS |
602 | * Increment the parent's usage counter and resume it if |
603 | * necessary. Not needed if dev is irq-safe; then the | |
604 | * parent is permanently resumed. | |
5e928f77 RW |
605 | */ |
606 | parent = dev->parent; | |
c7b61de5 AS |
607 | if (dev->power.irq_safe) |
608 | goto skip_parent; | |
862f89b3 | 609 | spin_unlock(&dev->power.lock); |
5e928f77 RW |
610 | |
611 | pm_runtime_get_noresume(parent); | |
612 | ||
862f89b3 | 613 | spin_lock(&parent->power.lock); |
5e928f77 | 614 | /* |
62052ab1 | 615 | * We can resume if the parent's runtime PM is disabled or it |
5e928f77 RW |
616 | * is set to ignore children. |
617 | */ | |
618 | if (!parent->power.disable_depth | |
619 | && !parent->power.ignore_children) { | |
140a6c94 | 620 | rpm_resume(parent, 0); |
5e928f77 RW |
621 | if (parent->power.runtime_status != RPM_ACTIVE) |
622 | retval = -EBUSY; | |
623 | } | |
862f89b3 | 624 | spin_unlock(&parent->power.lock); |
5e928f77 | 625 | |
862f89b3 | 626 | spin_lock(&dev->power.lock); |
5e928f77 RW |
627 | if (retval) |
628 | goto out; | |
629 | goto repeat; | |
630 | } | |
c7b61de5 | 631 | skip_parent: |
5e928f77 | 632 | |
7490e442 AS |
633 | if (dev->power.no_callbacks) |
634 | goto no_callback; /* Assume success. */ | |
635 | ||
8d4b9d1b | 636 | __update_runtime_status(dev, RPM_RESUMING); |
5e928f77 | 637 | |
564b905a RW |
638 | if (dev->pm_domain) |
639 | callback = dev->pm_domain->ops.runtime_resume; | |
4d27e9dc | 640 | else if (dev->type && dev->type->pm) |
71c63122 RW |
641 | callback = dev->type->pm->runtime_resume; |
642 | else if (dev->class && dev->class->pm) | |
643 | callback = dev->class->pm->runtime_resume; | |
9659cc06 RW |
644 | else if (dev->bus && dev->bus->pm) |
645 | callback = dev->bus->pm->runtime_resume; | |
71c63122 RW |
646 | else |
647 | callback = NULL; | |
5e928f77 | 648 | |
35cd133c RW |
649 | if (!callback && dev->driver && dev->driver->pm) |
650 | callback = dev->driver->pm->runtime_resume; | |
651 | ||
71c63122 | 652 | retval = rpm_callback(callback, dev); |
5e928f77 | 653 | if (retval) { |
8d4b9d1b | 654 | __update_runtime_status(dev, RPM_SUSPENDED); |
5e928f77 RW |
655 | pm_runtime_cancel_pending(dev); |
656 | } else { | |
7490e442 | 657 | no_callback: |
8d4b9d1b | 658 | __update_runtime_status(dev, RPM_ACTIVE); |
5e928f77 RW |
659 | if (parent) |
660 | atomic_inc(&parent->power.child_count); | |
661 | } | |
662 | wake_up_all(&dev->power.wait_queue); | |
663 | ||
7f321c26 | 664 | if (retval >= 0) |
140a6c94 | 665 | rpm_idle(dev, RPM_ASYNC); |
5e928f77 RW |
666 | |
667 | out: | |
c7b61de5 | 668 | if (parent && !dev->power.irq_safe) { |
5e928f77 RW |
669 | spin_unlock_irq(&dev->power.lock); |
670 | ||
671 | pm_runtime_put(parent); | |
672 | ||
673 | spin_lock_irq(&dev->power.lock); | |
674 | } | |
675 | ||
c3dc2f14 | 676 | trace_rpm_return_int(dev, _THIS_IP_, retval); |
5e928f77 RW |
677 | |
678 | return retval; | |
679 | } | |
680 | ||
5e928f77 | 681 | /** |
62052ab1 | 682 | * pm_runtime_work - Universal runtime PM work function. |
5e928f77 RW |
683 | * @work: Work structure used for scheduling the execution of this function. |
684 | * | |
685 | * Use @work to get the device object the work is to be done for, determine what | |
62052ab1 | 686 | * is to be done and execute the appropriate runtime PM function. |
5e928f77 RW |
687 | */ |
688 | static void pm_runtime_work(struct work_struct *work) | |
689 | { | |
690 | struct device *dev = container_of(work, struct device, power.work); | |
691 | enum rpm_request req; | |
692 | ||
693 | spin_lock_irq(&dev->power.lock); | |
694 | ||
695 | if (!dev->power.request_pending) | |
696 | goto out; | |
697 | ||
698 | req = dev->power.request; | |
699 | dev->power.request = RPM_REQ_NONE; | |
700 | dev->power.request_pending = false; | |
701 | ||
702 | switch (req) { | |
703 | case RPM_REQ_NONE: | |
704 | break; | |
705 | case RPM_REQ_IDLE: | |
140a6c94 | 706 | rpm_idle(dev, RPM_NOWAIT); |
5e928f77 RW |
707 | break; |
708 | case RPM_REQ_SUSPEND: | |
140a6c94 | 709 | rpm_suspend(dev, RPM_NOWAIT); |
5e928f77 | 710 | break; |
15bcb91d AS |
711 | case RPM_REQ_AUTOSUSPEND: |
712 | rpm_suspend(dev, RPM_NOWAIT | RPM_AUTO); | |
713 | break; | |
5e928f77 | 714 | case RPM_REQ_RESUME: |
140a6c94 | 715 | rpm_resume(dev, RPM_NOWAIT); |
5e928f77 RW |
716 | break; |
717 | } | |
718 | ||
719 | out: | |
720 | spin_unlock_irq(&dev->power.lock); | |
721 | } | |
722 | ||
5e928f77 RW |
723 | /** |
724 | * pm_suspend_timer_fn - Timer function for pm_schedule_suspend(). | |
725 | * @data: Device pointer passed by pm_schedule_suspend(). | |
726 | * | |
1bfee5bc | 727 | * Check if the time is right and queue a suspend request. |
5e928f77 RW |
728 | */ |
729 | static void pm_suspend_timer_fn(unsigned long data) | |
730 | { | |
731 | struct device *dev = (struct device *)data; | |
732 | unsigned long flags; | |
733 | unsigned long expires; | |
734 | ||
735 | spin_lock_irqsave(&dev->power.lock, flags); | |
736 | ||
737 | expires = dev->power.timer_expires; | |
738 | /* If 'expire' is after 'jiffies' we've been called too early. */ | |
739 | if (expires > 0 && !time_after(expires, jiffies)) { | |
740 | dev->power.timer_expires = 0; | |
15bcb91d AS |
741 | rpm_suspend(dev, dev->power.timer_autosuspends ? |
742 | (RPM_ASYNC | RPM_AUTO) : RPM_ASYNC); | |
5e928f77 RW |
743 | } |
744 | ||
745 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
746 | } | |
747 | ||
748 | /** | |
749 | * pm_schedule_suspend - Set up a timer to submit a suspend request in future. | |
750 | * @dev: Device to suspend. | |
751 | * @delay: Time to wait before submitting a suspend request, in milliseconds. | |
752 | */ | |
753 | int pm_schedule_suspend(struct device *dev, unsigned int delay) | |
754 | { | |
755 | unsigned long flags; | |
1bfee5bc | 756 | int retval; |
5e928f77 RW |
757 | |
758 | spin_lock_irqsave(&dev->power.lock, flags); | |
759 | ||
5e928f77 | 760 | if (!delay) { |
140a6c94 | 761 | retval = rpm_suspend(dev, RPM_ASYNC); |
5e928f77 RW |
762 | goto out; |
763 | } | |
764 | ||
1bfee5bc | 765 | retval = rpm_check_suspend_allowed(dev); |
5e928f77 RW |
766 | if (retval) |
767 | goto out; | |
768 | ||
1bfee5bc AS |
769 | /* Other scheduled or pending requests need to be canceled. */ |
770 | pm_runtime_cancel_pending(dev); | |
771 | ||
5e928f77 | 772 | dev->power.timer_expires = jiffies + msecs_to_jiffies(delay); |
1bfee5bc | 773 | dev->power.timer_expires += !dev->power.timer_expires; |
15bcb91d | 774 | dev->power.timer_autosuspends = 0; |
5e928f77 RW |
775 | mod_timer(&dev->power.suspend_timer, dev->power.timer_expires); |
776 | ||
777 | out: | |
778 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
779 | ||
780 | return retval; | |
781 | } | |
782 | EXPORT_SYMBOL_GPL(pm_schedule_suspend); | |
783 | ||
5e928f77 | 784 | /** |
62052ab1 | 785 | * __pm_runtime_idle - Entry point for runtime idle operations. |
140a6c94 AS |
786 | * @dev: Device to send idle notification for. |
787 | * @rpmflags: Flag bits. | |
788 | * | |
789 | * If the RPM_GET_PUT flag is set, decrement the device's usage count and | |
790 | * return immediately if it is larger than zero. Then carry out an idle | |
791 | * notification, either synchronous or asynchronous. | |
792 | * | |
311aab73 CC |
793 | * This routine may be called in atomic context if the RPM_ASYNC flag is set, |
794 | * or if pm_runtime_irq_safe() has been called. | |
5e928f77 | 795 | */ |
140a6c94 | 796 | int __pm_runtime_idle(struct device *dev, int rpmflags) |
5e928f77 RW |
797 | { |
798 | unsigned long flags; | |
799 | int retval; | |
800 | ||
311aab73 CC |
801 | might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe); |
802 | ||
140a6c94 AS |
803 | if (rpmflags & RPM_GET_PUT) { |
804 | if (!atomic_dec_and_test(&dev->power.usage_count)) | |
805 | return 0; | |
806 | } | |
807 | ||
5e928f77 | 808 | spin_lock_irqsave(&dev->power.lock, flags); |
140a6c94 | 809 | retval = rpm_idle(dev, rpmflags); |
5e928f77 RW |
810 | spin_unlock_irqrestore(&dev->power.lock, flags); |
811 | ||
812 | return retval; | |
813 | } | |
140a6c94 | 814 | EXPORT_SYMBOL_GPL(__pm_runtime_idle); |
5e928f77 RW |
815 | |
816 | /** | |
62052ab1 | 817 | * __pm_runtime_suspend - Entry point for runtime put/suspend operations. |
140a6c94 | 818 | * @dev: Device to suspend. |
3f9af051 | 819 | * @rpmflags: Flag bits. |
5e928f77 | 820 | * |
15bcb91d AS |
821 | * If the RPM_GET_PUT flag is set, decrement the device's usage count and |
822 | * return immediately if it is larger than zero. Then carry out a suspend, | |
823 | * either synchronous or asynchronous. | |
140a6c94 | 824 | * |
311aab73 CC |
825 | * This routine may be called in atomic context if the RPM_ASYNC flag is set, |
826 | * or if pm_runtime_irq_safe() has been called. | |
5e928f77 | 827 | */ |
140a6c94 | 828 | int __pm_runtime_suspend(struct device *dev, int rpmflags) |
5e928f77 | 829 | { |
140a6c94 | 830 | unsigned long flags; |
1d531c14 | 831 | int retval; |
5e928f77 | 832 | |
311aab73 CC |
833 | might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe); |
834 | ||
15bcb91d AS |
835 | if (rpmflags & RPM_GET_PUT) { |
836 | if (!atomic_dec_and_test(&dev->power.usage_count)) | |
837 | return 0; | |
838 | } | |
839 | ||
140a6c94 AS |
840 | spin_lock_irqsave(&dev->power.lock, flags); |
841 | retval = rpm_suspend(dev, rpmflags); | |
842 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
5e928f77 RW |
843 | |
844 | return retval; | |
845 | } | |
140a6c94 | 846 | EXPORT_SYMBOL_GPL(__pm_runtime_suspend); |
5e928f77 RW |
847 | |
848 | /** | |
62052ab1 | 849 | * __pm_runtime_resume - Entry point for runtime resume operations. |
140a6c94 | 850 | * @dev: Device to resume. |
3f9af051 | 851 | * @rpmflags: Flag bits. |
5e928f77 | 852 | * |
140a6c94 AS |
853 | * If the RPM_GET_PUT flag is set, increment the device's usage count. Then |
854 | * carry out a resume, either synchronous or asynchronous. | |
855 | * | |
311aab73 CC |
856 | * This routine may be called in atomic context if the RPM_ASYNC flag is set, |
857 | * or if pm_runtime_irq_safe() has been called. | |
5e928f77 | 858 | */ |
140a6c94 | 859 | int __pm_runtime_resume(struct device *dev, int rpmflags) |
5e928f77 | 860 | { |
140a6c94 AS |
861 | unsigned long flags; |
862 | int retval; | |
5e928f77 | 863 | |
311aab73 CC |
864 | might_sleep_if(!(rpmflags & RPM_ASYNC) && !dev->power.irq_safe); |
865 | ||
140a6c94 AS |
866 | if (rpmflags & RPM_GET_PUT) |
867 | atomic_inc(&dev->power.usage_count); | |
868 | ||
869 | spin_lock_irqsave(&dev->power.lock, flags); | |
870 | retval = rpm_resume(dev, rpmflags); | |
871 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
5e928f77 RW |
872 | |
873 | return retval; | |
874 | } | |
140a6c94 | 875 | EXPORT_SYMBOL_GPL(__pm_runtime_resume); |
5e928f77 RW |
876 | |
877 | /** | |
62052ab1 | 878 | * __pm_runtime_set_status - Set runtime PM status of a device. |
5e928f77 | 879 | * @dev: Device to handle. |
62052ab1 | 880 | * @status: New runtime PM status of the device. |
5e928f77 | 881 | * |
62052ab1 | 882 | * If runtime PM of the device is disabled or its power.runtime_error field is |
5e928f77 RW |
883 | * different from zero, the status may be changed either to RPM_ACTIVE, or to |
884 | * RPM_SUSPENDED, as long as that reflects the actual state of the device. | |
885 | * However, if the device has a parent and the parent is not active, and the | |
886 | * parent's power.ignore_children flag is unset, the device's status cannot be | |
887 | * set to RPM_ACTIVE, so -EBUSY is returned in that case. | |
888 | * | |
889 | * If successful, __pm_runtime_set_status() clears the power.runtime_error field | |
890 | * and the device parent's counter of unsuspended children is modified to | |
891 | * reflect the new status. If the new status is RPM_SUSPENDED, an idle | |
892 | * notification request for the parent is submitted. | |
893 | */ | |
894 | int __pm_runtime_set_status(struct device *dev, unsigned int status) | |
895 | { | |
896 | struct device *parent = dev->parent; | |
897 | unsigned long flags; | |
898 | bool notify_parent = false; | |
899 | int error = 0; | |
900 | ||
901 | if (status != RPM_ACTIVE && status != RPM_SUSPENDED) | |
902 | return -EINVAL; | |
903 | ||
904 | spin_lock_irqsave(&dev->power.lock, flags); | |
905 | ||
906 | if (!dev->power.runtime_error && !dev->power.disable_depth) { | |
907 | error = -EAGAIN; | |
908 | goto out; | |
909 | } | |
910 | ||
911 | if (dev->power.runtime_status == status) | |
912 | goto out_set; | |
913 | ||
914 | if (status == RPM_SUSPENDED) { | |
915 | /* It always is possible to set the status to 'suspended'. */ | |
916 | if (parent) { | |
917 | atomic_add_unless(&parent->power.child_count, -1, 0); | |
918 | notify_parent = !parent->power.ignore_children; | |
919 | } | |
920 | goto out_set; | |
921 | } | |
922 | ||
923 | if (parent) { | |
bab636b9 | 924 | spin_lock_nested(&parent->power.lock, SINGLE_DEPTH_NESTING); |
5e928f77 RW |
925 | |
926 | /* | |
927 | * It is invalid to put an active child under a parent that is | |
62052ab1 | 928 | * not active, has runtime PM enabled and the |
5e928f77 RW |
929 | * 'power.ignore_children' flag unset. |
930 | */ | |
931 | if (!parent->power.disable_depth | |
932 | && !parent->power.ignore_children | |
965c4ac0 | 933 | && parent->power.runtime_status != RPM_ACTIVE) |
5e928f77 | 934 | error = -EBUSY; |
965c4ac0 RW |
935 | else if (dev->power.runtime_status == RPM_SUSPENDED) |
936 | atomic_inc(&parent->power.child_count); | |
5e928f77 | 937 | |
862f89b3 | 938 | spin_unlock(&parent->power.lock); |
5e928f77 RW |
939 | |
940 | if (error) | |
941 | goto out; | |
942 | } | |
943 | ||
944 | out_set: | |
8d4b9d1b | 945 | __update_runtime_status(dev, status); |
5e928f77 RW |
946 | dev->power.runtime_error = 0; |
947 | out: | |
948 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
949 | ||
950 | if (notify_parent) | |
951 | pm_request_idle(parent); | |
952 | ||
953 | return error; | |
954 | } | |
955 | EXPORT_SYMBOL_GPL(__pm_runtime_set_status); | |
956 | ||
957 | /** | |
958 | * __pm_runtime_barrier - Cancel pending requests and wait for completions. | |
959 | * @dev: Device to handle. | |
960 | * | |
961 | * Flush all pending requests for the device from pm_wq and wait for all | |
62052ab1 | 962 | * runtime PM operations involving the device in progress to complete. |
5e928f77 RW |
963 | * |
964 | * Should be called under dev->power.lock with interrupts disabled. | |
965 | */ | |
966 | static void __pm_runtime_barrier(struct device *dev) | |
967 | { | |
968 | pm_runtime_deactivate_timer(dev); | |
969 | ||
970 | if (dev->power.request_pending) { | |
971 | dev->power.request = RPM_REQ_NONE; | |
972 | spin_unlock_irq(&dev->power.lock); | |
973 | ||
974 | cancel_work_sync(&dev->power.work); | |
975 | ||
976 | spin_lock_irq(&dev->power.lock); | |
977 | dev->power.request_pending = false; | |
978 | } | |
979 | ||
980 | if (dev->power.runtime_status == RPM_SUSPENDING | |
981 | || dev->power.runtime_status == RPM_RESUMING | |
982 | || dev->power.idle_notification) { | |
983 | DEFINE_WAIT(wait); | |
984 | ||
985 | /* Suspend, wake-up or idle notification in progress. */ | |
986 | for (;;) { | |
987 | prepare_to_wait(&dev->power.wait_queue, &wait, | |
988 | TASK_UNINTERRUPTIBLE); | |
989 | if (dev->power.runtime_status != RPM_SUSPENDING | |
990 | && dev->power.runtime_status != RPM_RESUMING | |
991 | && !dev->power.idle_notification) | |
992 | break; | |
993 | spin_unlock_irq(&dev->power.lock); | |
994 | ||
995 | schedule(); | |
996 | ||
997 | spin_lock_irq(&dev->power.lock); | |
998 | } | |
999 | finish_wait(&dev->power.wait_queue, &wait); | |
1000 | } | |
1001 | } | |
1002 | ||
1003 | /** | |
1004 | * pm_runtime_barrier - Flush pending requests and wait for completions. | |
1005 | * @dev: Device to handle. | |
1006 | * | |
1007 | * Prevent the device from being suspended by incrementing its usage counter and | |
1008 | * if there's a pending resume request for the device, wake the device up. | |
1009 | * Next, make sure that all pending requests for the device have been flushed | |
62052ab1 | 1010 | * from pm_wq and wait for all runtime PM operations involving the device in |
5e928f77 RW |
1011 | * progress to complete. |
1012 | * | |
1013 | * Return value: | |
1014 | * 1, if there was a resume request pending and the device had to be woken up, | |
1015 | * 0, otherwise | |
1016 | */ | |
1017 | int pm_runtime_barrier(struct device *dev) | |
1018 | { | |
1019 | int retval = 0; | |
1020 | ||
1021 | pm_runtime_get_noresume(dev); | |
1022 | spin_lock_irq(&dev->power.lock); | |
1023 | ||
1024 | if (dev->power.request_pending | |
1025 | && dev->power.request == RPM_REQ_RESUME) { | |
140a6c94 | 1026 | rpm_resume(dev, 0); |
5e928f77 RW |
1027 | retval = 1; |
1028 | } | |
1029 | ||
1030 | __pm_runtime_barrier(dev); | |
1031 | ||
1032 | spin_unlock_irq(&dev->power.lock); | |
1033 | pm_runtime_put_noidle(dev); | |
1034 | ||
1035 | return retval; | |
1036 | } | |
1037 | EXPORT_SYMBOL_GPL(pm_runtime_barrier); | |
1038 | ||
1039 | /** | |
62052ab1 | 1040 | * __pm_runtime_disable - Disable runtime PM of a device. |
5e928f77 RW |
1041 | * @dev: Device to handle. |
1042 | * @check_resume: If set, check if there's a resume request for the device. | |
1043 | * | |
1044 | * Increment power.disable_depth for the device and if was zero previously, | |
62052ab1 | 1045 | * cancel all pending runtime PM requests for the device and wait for all |
5e928f77 | 1046 | * operations in progress to complete. The device can be either active or |
62052ab1 | 1047 | * suspended after its runtime PM has been disabled. |
5e928f77 RW |
1048 | * |
1049 | * If @check_resume is set and there's a resume request pending when | |
1050 | * __pm_runtime_disable() is called and power.disable_depth is zero, the | |
62052ab1 | 1051 | * function will wake up the device before disabling its runtime PM. |
5e928f77 RW |
1052 | */ |
1053 | void __pm_runtime_disable(struct device *dev, bool check_resume) | |
1054 | { | |
1055 | spin_lock_irq(&dev->power.lock); | |
1056 | ||
1057 | if (dev->power.disable_depth > 0) { | |
1058 | dev->power.disable_depth++; | |
1059 | goto out; | |
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * Wake up the device if there's a resume request pending, because that | |
62052ab1 | 1064 | * means there probably is some I/O to process and disabling runtime PM |
5e928f77 RW |
1065 | * shouldn't prevent the device from processing the I/O. |
1066 | */ | |
1067 | if (check_resume && dev->power.request_pending | |
1068 | && dev->power.request == RPM_REQ_RESUME) { | |
1069 | /* | |
1070 | * Prevent suspends and idle notifications from being carried | |
1071 | * out after we have woken up the device. | |
1072 | */ | |
1073 | pm_runtime_get_noresume(dev); | |
1074 | ||
140a6c94 | 1075 | rpm_resume(dev, 0); |
5e928f77 RW |
1076 | |
1077 | pm_runtime_put_noidle(dev); | |
1078 | } | |
1079 | ||
1080 | if (!dev->power.disable_depth++) | |
1081 | __pm_runtime_barrier(dev); | |
1082 | ||
1083 | out: | |
1084 | spin_unlock_irq(&dev->power.lock); | |
1085 | } | |
1086 | EXPORT_SYMBOL_GPL(__pm_runtime_disable); | |
1087 | ||
1088 | /** | |
62052ab1 | 1089 | * pm_runtime_enable - Enable runtime PM of a device. |
5e928f77 RW |
1090 | * @dev: Device to handle. |
1091 | */ | |
1092 | void pm_runtime_enable(struct device *dev) | |
1093 | { | |
1094 | unsigned long flags; | |
1095 | ||
1096 | spin_lock_irqsave(&dev->power.lock, flags); | |
1097 | ||
1098 | if (dev->power.disable_depth > 0) | |
1099 | dev->power.disable_depth--; | |
1100 | else | |
1101 | dev_warn(dev, "Unbalanced %s!\n", __func__); | |
1102 | ||
1103 | spin_unlock_irqrestore(&dev->power.lock, flags); | |
1104 | } | |
1105 | EXPORT_SYMBOL_GPL(pm_runtime_enable); | |
1106 | ||
53823639 | 1107 | /** |
62052ab1 | 1108 | * pm_runtime_forbid - Block runtime PM of a device. |
53823639 RW |
1109 | * @dev: Device to handle. |
1110 | * | |
1111 | * Increase the device's usage count and clear its power.runtime_auto flag, | |
1112 | * so that it cannot be suspended at run time until pm_runtime_allow() is called | |
1113 | * for it. | |
1114 | */ | |
1115 | void pm_runtime_forbid(struct device *dev) | |
1116 | { | |
1117 | spin_lock_irq(&dev->power.lock); | |
1118 | if (!dev->power.runtime_auto) | |
1119 | goto out; | |
1120 | ||
1121 | dev->power.runtime_auto = false; | |
1122 | atomic_inc(&dev->power.usage_count); | |
140a6c94 | 1123 | rpm_resume(dev, 0); |
53823639 RW |
1124 | |
1125 | out: | |
1126 | spin_unlock_irq(&dev->power.lock); | |
1127 | } | |
1128 | EXPORT_SYMBOL_GPL(pm_runtime_forbid); | |
1129 | ||
1130 | /** | |
62052ab1 | 1131 | * pm_runtime_allow - Unblock runtime PM of a device. |
53823639 RW |
1132 | * @dev: Device to handle. |
1133 | * | |
1134 | * Decrease the device's usage count and set its power.runtime_auto flag. | |
1135 | */ | |
1136 | void pm_runtime_allow(struct device *dev) | |
1137 | { | |
1138 | spin_lock_irq(&dev->power.lock); | |
1139 | if (dev->power.runtime_auto) | |
1140 | goto out; | |
1141 | ||
1142 | dev->power.runtime_auto = true; | |
1143 | if (atomic_dec_and_test(&dev->power.usage_count)) | |
15bcb91d | 1144 | rpm_idle(dev, RPM_AUTO); |
53823639 RW |
1145 | |
1146 | out: | |
1147 | spin_unlock_irq(&dev->power.lock); | |
1148 | } | |
1149 | EXPORT_SYMBOL_GPL(pm_runtime_allow); | |
1150 | ||
7490e442 | 1151 | /** |
62052ab1 | 1152 | * pm_runtime_no_callbacks - Ignore runtime PM callbacks for a device. |
7490e442 AS |
1153 | * @dev: Device to handle. |
1154 | * | |
1155 | * Set the power.no_callbacks flag, which tells the PM core that this | |
62052ab1 RW |
1156 | * device is power-managed through its parent and has no runtime PM |
1157 | * callbacks of its own. The runtime sysfs attributes will be removed. | |
7490e442 AS |
1158 | */ |
1159 | void pm_runtime_no_callbacks(struct device *dev) | |
1160 | { | |
1161 | spin_lock_irq(&dev->power.lock); | |
1162 | dev->power.no_callbacks = 1; | |
1163 | spin_unlock_irq(&dev->power.lock); | |
1164 | if (device_is_registered(dev)) | |
1165 | rpm_sysfs_remove(dev); | |
1166 | } | |
1167 | EXPORT_SYMBOL_GPL(pm_runtime_no_callbacks); | |
1168 | ||
c7b61de5 AS |
1169 | /** |
1170 | * pm_runtime_irq_safe - Leave interrupts disabled during callbacks. | |
1171 | * @dev: Device to handle | |
1172 | * | |
1173 | * Set the power.irq_safe flag, which tells the PM core that the | |
1174 | * ->runtime_suspend() and ->runtime_resume() callbacks for this device should | |
1175 | * always be invoked with the spinlock held and interrupts disabled. It also | |
1176 | * causes the parent's usage counter to be permanently incremented, preventing | |
1177 | * the parent from runtime suspending -- otherwise an irq-safe child might have | |
1178 | * to wait for a non-irq-safe parent. | |
1179 | */ | |
1180 | void pm_runtime_irq_safe(struct device *dev) | |
1181 | { | |
1182 | if (dev->parent) | |
1183 | pm_runtime_get_sync(dev->parent); | |
1184 | spin_lock_irq(&dev->power.lock); | |
1185 | dev->power.irq_safe = 1; | |
1186 | spin_unlock_irq(&dev->power.lock); | |
1187 | } | |
1188 | EXPORT_SYMBOL_GPL(pm_runtime_irq_safe); | |
1189 | ||
15bcb91d AS |
1190 | /** |
1191 | * update_autosuspend - Handle a change to a device's autosuspend settings. | |
1192 | * @dev: Device to handle. | |
1193 | * @old_delay: The former autosuspend_delay value. | |
1194 | * @old_use: The former use_autosuspend value. | |
1195 | * | |
1196 | * Prevent runtime suspend if the new delay is negative and use_autosuspend is | |
1197 | * set; otherwise allow it. Send an idle notification if suspends are allowed. | |
1198 | * | |
1199 | * This function must be called under dev->power.lock with interrupts disabled. | |
1200 | */ | |
1201 | static void update_autosuspend(struct device *dev, int old_delay, int old_use) | |
1202 | { | |
1203 | int delay = dev->power.autosuspend_delay; | |
1204 | ||
1205 | /* Should runtime suspend be prevented now? */ | |
1206 | if (dev->power.use_autosuspend && delay < 0) { | |
1207 | ||
1208 | /* If it used to be allowed then prevent it. */ | |
1209 | if (!old_use || old_delay >= 0) { | |
1210 | atomic_inc(&dev->power.usage_count); | |
1211 | rpm_resume(dev, 0); | |
1212 | } | |
1213 | } | |
1214 | ||
1215 | /* Runtime suspend should be allowed now. */ | |
1216 | else { | |
1217 | ||
1218 | /* If it used to be prevented then allow it. */ | |
1219 | if (old_use && old_delay < 0) | |
1220 | atomic_dec(&dev->power.usage_count); | |
1221 | ||
1222 | /* Maybe we can autosuspend now. */ | |
1223 | rpm_idle(dev, RPM_AUTO); | |
1224 | } | |
1225 | } | |
1226 | ||
1227 | /** | |
1228 | * pm_runtime_set_autosuspend_delay - Set a device's autosuspend_delay value. | |
1229 | * @dev: Device to handle. | |
1230 | * @delay: Value of the new delay in milliseconds. | |
1231 | * | |
1232 | * Set the device's power.autosuspend_delay value. If it changes to negative | |
62052ab1 RW |
1233 | * and the power.use_autosuspend flag is set, prevent runtime suspends. If it |
1234 | * changes the other way, allow runtime suspends. | |
15bcb91d AS |
1235 | */ |
1236 | void pm_runtime_set_autosuspend_delay(struct device *dev, int delay) | |
1237 | { | |
1238 | int old_delay, old_use; | |
1239 | ||
1240 | spin_lock_irq(&dev->power.lock); | |
1241 | old_delay = dev->power.autosuspend_delay; | |
1242 | old_use = dev->power.use_autosuspend; | |
1243 | dev->power.autosuspend_delay = delay; | |
1244 | update_autosuspend(dev, old_delay, old_use); | |
1245 | spin_unlock_irq(&dev->power.lock); | |
1246 | } | |
1247 | EXPORT_SYMBOL_GPL(pm_runtime_set_autosuspend_delay); | |
1248 | ||
1249 | /** | |
1250 | * __pm_runtime_use_autosuspend - Set a device's use_autosuspend flag. | |
1251 | * @dev: Device to handle. | |
1252 | * @use: New value for use_autosuspend. | |
1253 | * | |
62052ab1 | 1254 | * Set the device's power.use_autosuspend flag, and allow or prevent runtime |
15bcb91d AS |
1255 | * suspends as needed. |
1256 | */ | |
1257 | void __pm_runtime_use_autosuspend(struct device *dev, bool use) | |
1258 | { | |
1259 | int old_delay, old_use; | |
1260 | ||
1261 | spin_lock_irq(&dev->power.lock); | |
1262 | old_delay = dev->power.autosuspend_delay; | |
1263 | old_use = dev->power.use_autosuspend; | |
1264 | dev->power.use_autosuspend = use; | |
1265 | update_autosuspend(dev, old_delay, old_use); | |
1266 | spin_unlock_irq(&dev->power.lock); | |
1267 | } | |
1268 | EXPORT_SYMBOL_GPL(__pm_runtime_use_autosuspend); | |
1269 | ||
5e928f77 | 1270 | /** |
62052ab1 | 1271 | * pm_runtime_init - Initialize runtime PM fields in given device object. |
5e928f77 RW |
1272 | * @dev: Device object to initialize. |
1273 | */ | |
1274 | void pm_runtime_init(struct device *dev) | |
1275 | { | |
5e928f77 RW |
1276 | dev->power.runtime_status = RPM_SUSPENDED; |
1277 | dev->power.idle_notification = false; | |
1278 | ||
1279 | dev->power.disable_depth = 1; | |
1280 | atomic_set(&dev->power.usage_count, 0); | |
1281 | ||
1282 | dev->power.runtime_error = 0; | |
1283 | ||
1284 | atomic_set(&dev->power.child_count, 0); | |
1285 | pm_suspend_ignore_children(dev, false); | |
53823639 | 1286 | dev->power.runtime_auto = true; |
5e928f77 RW |
1287 | |
1288 | dev->power.request_pending = false; | |
1289 | dev->power.request = RPM_REQ_NONE; | |
1290 | dev->power.deferred_resume = false; | |
8d4b9d1b | 1291 | dev->power.accounting_timestamp = jiffies; |
5e928f77 RW |
1292 | INIT_WORK(&dev->power.work, pm_runtime_work); |
1293 | ||
1294 | dev->power.timer_expires = 0; | |
1295 | setup_timer(&dev->power.suspend_timer, pm_suspend_timer_fn, | |
1296 | (unsigned long)dev); | |
1297 | ||
1298 | init_waitqueue_head(&dev->power.wait_queue); | |
1299 | } | |
1300 | ||
1301 | /** | |
1302 | * pm_runtime_remove - Prepare for removing a device from device hierarchy. | |
1303 | * @dev: Device object being removed from device hierarchy. | |
1304 | */ | |
1305 | void pm_runtime_remove(struct device *dev) | |
1306 | { | |
1307 | __pm_runtime_disable(dev, false); | |
1308 | ||
1309 | /* Change the status back to 'suspended' to match the initial status. */ | |
1310 | if (dev->power.runtime_status == RPM_ACTIVE) | |
1311 | pm_runtime_set_suspended(dev); | |
c7b61de5 AS |
1312 | if (dev->power.irq_safe && dev->parent) |
1313 | pm_runtime_put_sync(dev->parent); | |
5e928f77 | 1314 | } |