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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/base/power/main.c - Where the driver meets power management. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * | |
10 | * The driver model core calls device_pm_add() when a device is registered. | |
11 | * This will intialize the embedded device_pm_info object in the device | |
12 | * and add it to the list of power-controlled devices. sysfs entries for | |
13 | * controlling device power management will also be added. | |
14 | * | |
1eede070 RW |
15 | * A separate list is used for keeping track of power info, because the power |
16 | * domain dependencies may differ from the ancestral dependencies that the | |
17 | * subsystem list maintains. | |
1da177e4 LT |
18 | */ |
19 | ||
1da177e4 | 20 | #include <linux/device.h> |
cd59abfc | 21 | #include <linux/kallsyms.h> |
11048dcf | 22 | #include <linux/mutex.h> |
cd59abfc | 23 | #include <linux/pm.h> |
5e928f77 | 24 | #include <linux/pm_runtime.h> |
cd59abfc | 25 | #include <linux/resume-trace.h> |
2ed8d2b3 | 26 | #include <linux/interrupt.h> |
f2511774 | 27 | #include <linux/sched.h> |
5af84b82 | 28 | #include <linux/async.h> |
11048dcf | 29 | |
cd59abfc | 30 | #include "../base.h" |
1da177e4 LT |
31 | #include "power.h" |
32 | ||
775b64d2 | 33 | /* |
1eede070 | 34 | * The entries in the dpm_list list are in a depth first order, simply |
775b64d2 RW |
35 | * because children are guaranteed to be discovered after parents, and |
36 | * are inserted at the back of the list on discovery. | |
37 | * | |
775b64d2 RW |
38 | * Since device_pm_add() may be called with a device semaphore held, |
39 | * we must never try to acquire a device semaphore while holding | |
40 | * dpm_list_mutex. | |
41 | */ | |
42 | ||
1eede070 | 43 | LIST_HEAD(dpm_list); |
1da177e4 | 44 | |
cd59abfc | 45 | static DEFINE_MUTEX(dpm_list_mtx); |
5af84b82 | 46 | static pm_message_t pm_transition; |
1da177e4 | 47 | |
1eede070 RW |
48 | /* |
49 | * Set once the preparation of devices for a PM transition has started, reset | |
50 | * before starting to resume devices. Protected by dpm_list_mtx. | |
51 | */ | |
52 | static bool transition_started; | |
53 | ||
5e928f77 | 54 | /** |
20d652d7 | 55 | * device_pm_init - Initialize the PM-related part of a device object. |
5e928f77 RW |
56 | * @dev: Device object being initialized. |
57 | */ | |
58 | void device_pm_init(struct device *dev) | |
59 | { | |
60 | dev->power.status = DPM_ON; | |
5af84b82 | 61 | init_completion(&dev->power.completion); |
5e928f77 RW |
62 | pm_runtime_init(dev); |
63 | } | |
64 | ||
1eede070 | 65 | /** |
20d652d7 | 66 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
67 | */ |
68 | void device_pm_lock(void) | |
69 | { | |
70 | mutex_lock(&dpm_list_mtx); | |
71 | } | |
72 | ||
73 | /** | |
20d652d7 | 74 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
75 | */ |
76 | void device_pm_unlock(void) | |
77 | { | |
78 | mutex_unlock(&dpm_list_mtx); | |
79 | } | |
075c1771 | 80 | |
775b64d2 | 81 | /** |
20d652d7 RW |
82 | * device_pm_add - Add a device to the PM core's list of active devices. |
83 | * @dev: Device to add to the list. | |
775b64d2 | 84 | */ |
3b98aeaf | 85 | void device_pm_add(struct device *dev) |
1da177e4 | 86 | { |
1da177e4 | 87 | pr_debug("PM: Adding info for %s:%s\n", |
c48ea603 DT |
88 | dev->bus ? dev->bus->name : "No Bus", |
89 | kobject_name(&dev->kobj)); | |
11048dcf | 90 | mutex_lock(&dpm_list_mtx); |
1eede070 | 91 | if (dev->parent) { |
f5a6d958 RW |
92 | if (dev->parent->power.status >= DPM_SUSPENDING) |
93 | dev_warn(dev, "parent %s should not be sleeping\n", | |
1e0b2cf9 | 94 | dev_name(dev->parent)); |
1eede070 RW |
95 | } else if (transition_started) { |
96 | /* | |
97 | * We refuse to register parentless devices while a PM | |
98 | * transition is in progress in order to avoid leaving them | |
99 | * unhandled down the road | |
100 | */ | |
728f0893 | 101 | dev_WARN(dev, "Parentless device registered during a PM transaction\n"); |
58aca232 | 102 | } |
3b98aeaf AS |
103 | |
104 | list_add_tail(&dev->power.entry, &dpm_list); | |
11048dcf | 105 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
106 | } |
107 | ||
775b64d2 | 108 | /** |
20d652d7 RW |
109 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
110 | * @dev: Device to be removed from the list. | |
775b64d2 | 111 | */ |
9cddad77 | 112 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
113 | { |
114 | pr_debug("PM: Removing info for %s:%s\n", | |
c48ea603 DT |
115 | dev->bus ? dev->bus->name : "No Bus", |
116 | kobject_name(&dev->kobj)); | |
5af84b82 | 117 | complete_all(&dev->power.completion); |
11048dcf | 118 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 119 | list_del_init(&dev->power.entry); |
11048dcf | 120 | mutex_unlock(&dpm_list_mtx); |
5e928f77 | 121 | pm_runtime_remove(dev); |
775b64d2 RW |
122 | } |
123 | ||
ffa6a705 | 124 | /** |
20d652d7 RW |
125 | * device_pm_move_before - Move device in the PM core's list of active devices. |
126 | * @deva: Device to move in dpm_list. | |
127 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
128 | */ |
129 | void device_pm_move_before(struct device *deva, struct device *devb) | |
130 | { | |
131 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
132 | deva->bus ? deva->bus->name : "No Bus", | |
133 | kobject_name(&deva->kobj), | |
134 | devb->bus ? devb->bus->name : "No Bus", | |
135 | kobject_name(&devb->kobj)); | |
136 | /* Delete deva from dpm_list and reinsert before devb. */ | |
137 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
138 | } | |
139 | ||
140 | /** | |
20d652d7 RW |
141 | * device_pm_move_after - Move device in the PM core's list of active devices. |
142 | * @deva: Device to move in dpm_list. | |
143 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
144 | */ |
145 | void device_pm_move_after(struct device *deva, struct device *devb) | |
146 | { | |
147 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
148 | deva->bus ? deva->bus->name : "No Bus", | |
149 | kobject_name(&deva->kobj), | |
150 | devb->bus ? devb->bus->name : "No Bus", | |
151 | kobject_name(&devb->kobj)); | |
152 | /* Delete deva from dpm_list and reinsert after devb. */ | |
153 | list_move(&deva->power.entry, &devb->power.entry); | |
154 | } | |
155 | ||
156 | /** | |
20d652d7 RW |
157 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
158 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
159 | */ |
160 | void device_pm_move_last(struct device *dev) | |
161 | { | |
162 | pr_debug("PM: Moving %s:%s to end of list\n", | |
163 | dev->bus ? dev->bus->name : "No Bus", | |
164 | kobject_name(&dev->kobj)); | |
165 | list_move_tail(&dev->power.entry, &dpm_list); | |
166 | } | |
167 | ||
875ab0b7 RW |
168 | static ktime_t initcall_debug_start(struct device *dev) |
169 | { | |
170 | ktime_t calltime = ktime_set(0, 0); | |
171 | ||
172 | if (initcall_debug) { | |
173 | pr_info("calling %s+ @ %i\n", | |
174 | dev_name(dev), task_pid_nr(current)); | |
175 | calltime = ktime_get(); | |
176 | } | |
177 | ||
178 | return calltime; | |
179 | } | |
180 | ||
181 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
182 | int error) | |
183 | { | |
184 | ktime_t delta, rettime; | |
185 | ||
186 | if (initcall_debug) { | |
187 | rettime = ktime_get(); | |
188 | delta = ktime_sub(rettime, calltime); | |
189 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), | |
190 | error, (unsigned long long)ktime_to_ns(delta) >> 10); | |
191 | } | |
192 | } | |
193 | ||
5af84b82 RW |
194 | /** |
195 | * dpm_wait - Wait for a PM operation to complete. | |
196 | * @dev: Device to wait for. | |
197 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
198 | */ | |
199 | static void dpm_wait(struct device *dev, bool async) | |
200 | { | |
201 | if (!dev) | |
202 | return; | |
203 | ||
0e06b4a8 | 204 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
205 | wait_for_completion(&dev->power.completion); |
206 | } | |
207 | ||
208 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
209 | { | |
210 | dpm_wait(dev, *((bool *)async_ptr)); | |
211 | return 0; | |
212 | } | |
213 | ||
214 | static void dpm_wait_for_children(struct device *dev, bool async) | |
215 | { | |
216 | device_for_each_child(dev, &async, dpm_wait_fn); | |
217 | } | |
218 | ||
1eede070 | 219 | /** |
20d652d7 RW |
220 | * pm_op - Execute the PM operation appropriate for given PM event. |
221 | * @dev: Device to handle. | |
222 | * @ops: PM operations to choose from. | |
223 | * @state: PM transition of the system being carried out. | |
1eede070 | 224 | */ |
d9ab7716 DT |
225 | static int pm_op(struct device *dev, |
226 | const struct dev_pm_ops *ops, | |
227 | pm_message_t state) | |
1eede070 RW |
228 | { |
229 | int error = 0; | |
875ab0b7 | 230 | ktime_t calltime; |
f2511774 | 231 | |
875ab0b7 | 232 | calltime = initcall_debug_start(dev); |
1eede070 RW |
233 | |
234 | switch (state.event) { | |
235 | #ifdef CONFIG_SUSPEND | |
236 | case PM_EVENT_SUSPEND: | |
237 | if (ops->suspend) { | |
238 | error = ops->suspend(dev); | |
239 | suspend_report_result(ops->suspend, error); | |
240 | } | |
241 | break; | |
242 | case PM_EVENT_RESUME: | |
243 | if (ops->resume) { | |
244 | error = ops->resume(dev); | |
245 | suspend_report_result(ops->resume, error); | |
246 | } | |
247 | break; | |
248 | #endif /* CONFIG_SUSPEND */ | |
249 | #ifdef CONFIG_HIBERNATION | |
250 | case PM_EVENT_FREEZE: | |
251 | case PM_EVENT_QUIESCE: | |
252 | if (ops->freeze) { | |
253 | error = ops->freeze(dev); | |
254 | suspend_report_result(ops->freeze, error); | |
255 | } | |
256 | break; | |
257 | case PM_EVENT_HIBERNATE: | |
258 | if (ops->poweroff) { | |
259 | error = ops->poweroff(dev); | |
260 | suspend_report_result(ops->poweroff, error); | |
261 | } | |
262 | break; | |
263 | case PM_EVENT_THAW: | |
264 | case PM_EVENT_RECOVER: | |
265 | if (ops->thaw) { | |
266 | error = ops->thaw(dev); | |
267 | suspend_report_result(ops->thaw, error); | |
268 | } | |
269 | break; | |
270 | case PM_EVENT_RESTORE: | |
271 | if (ops->restore) { | |
272 | error = ops->restore(dev); | |
273 | suspend_report_result(ops->restore, error); | |
274 | } | |
275 | break; | |
276 | #endif /* CONFIG_HIBERNATION */ | |
277 | default: | |
278 | error = -EINVAL; | |
279 | } | |
f2511774 | 280 | |
875ab0b7 | 281 | initcall_debug_report(dev, calltime, error); |
f2511774 | 282 | |
1eede070 RW |
283 | return error; |
284 | } | |
285 | ||
286 | /** | |
20d652d7 RW |
287 | * pm_noirq_op - Execute the PM operation appropriate for given PM event. |
288 | * @dev: Device to handle. | |
289 | * @ops: PM operations to choose from. | |
290 | * @state: PM transition of the system being carried out. | |
1eede070 | 291 | * |
20d652d7 RW |
292 | * The driver of @dev will not receive interrupts while this function is being |
293 | * executed. | |
1eede070 | 294 | */ |
d9ab7716 DT |
295 | static int pm_noirq_op(struct device *dev, |
296 | const struct dev_pm_ops *ops, | |
1eede070 RW |
297 | pm_message_t state) |
298 | { | |
299 | int error = 0; | |
f2511774 AV |
300 | ktime_t calltime, delta, rettime; |
301 | ||
302 | if (initcall_debug) { | |
8cc6b39f RW |
303 | pr_info("calling %s+ @ %i, parent: %s\n", |
304 | dev_name(dev), task_pid_nr(current), | |
305 | dev->parent ? dev_name(dev->parent) : "none"); | |
f2511774 AV |
306 | calltime = ktime_get(); |
307 | } | |
1eede070 RW |
308 | |
309 | switch (state.event) { | |
310 | #ifdef CONFIG_SUSPEND | |
311 | case PM_EVENT_SUSPEND: | |
312 | if (ops->suspend_noirq) { | |
313 | error = ops->suspend_noirq(dev); | |
314 | suspend_report_result(ops->suspend_noirq, error); | |
315 | } | |
316 | break; | |
317 | case PM_EVENT_RESUME: | |
318 | if (ops->resume_noirq) { | |
319 | error = ops->resume_noirq(dev); | |
320 | suspend_report_result(ops->resume_noirq, error); | |
321 | } | |
322 | break; | |
323 | #endif /* CONFIG_SUSPEND */ | |
324 | #ifdef CONFIG_HIBERNATION | |
325 | case PM_EVENT_FREEZE: | |
326 | case PM_EVENT_QUIESCE: | |
327 | if (ops->freeze_noirq) { | |
328 | error = ops->freeze_noirq(dev); | |
329 | suspend_report_result(ops->freeze_noirq, error); | |
330 | } | |
331 | break; | |
332 | case PM_EVENT_HIBERNATE: | |
333 | if (ops->poweroff_noirq) { | |
334 | error = ops->poweroff_noirq(dev); | |
335 | suspend_report_result(ops->poweroff_noirq, error); | |
336 | } | |
337 | break; | |
338 | case PM_EVENT_THAW: | |
339 | case PM_EVENT_RECOVER: | |
340 | if (ops->thaw_noirq) { | |
341 | error = ops->thaw_noirq(dev); | |
342 | suspend_report_result(ops->thaw_noirq, error); | |
343 | } | |
344 | break; | |
345 | case PM_EVENT_RESTORE: | |
346 | if (ops->restore_noirq) { | |
347 | error = ops->restore_noirq(dev); | |
348 | suspend_report_result(ops->restore_noirq, error); | |
349 | } | |
350 | break; | |
351 | #endif /* CONFIG_HIBERNATION */ | |
352 | default: | |
353 | error = -EINVAL; | |
354 | } | |
f2511774 AV |
355 | |
356 | if (initcall_debug) { | |
357 | rettime = ktime_get(); | |
358 | delta = ktime_sub(rettime, calltime); | |
875ab0b7 RW |
359 | printk("initcall %s_i+ returned %d after %Ld usecs\n", |
360 | dev_name(dev), error, | |
361 | (unsigned long long)ktime_to_ns(delta) >> 10); | |
f2511774 AV |
362 | } |
363 | ||
1eede070 RW |
364 | return error; |
365 | } | |
366 | ||
367 | static char *pm_verb(int event) | |
368 | { | |
369 | switch (event) { | |
370 | case PM_EVENT_SUSPEND: | |
371 | return "suspend"; | |
372 | case PM_EVENT_RESUME: | |
373 | return "resume"; | |
374 | case PM_EVENT_FREEZE: | |
375 | return "freeze"; | |
376 | case PM_EVENT_QUIESCE: | |
377 | return "quiesce"; | |
378 | case PM_EVENT_HIBERNATE: | |
379 | return "hibernate"; | |
380 | case PM_EVENT_THAW: | |
381 | return "thaw"; | |
382 | case PM_EVENT_RESTORE: | |
383 | return "restore"; | |
384 | case PM_EVENT_RECOVER: | |
385 | return "recover"; | |
386 | default: | |
387 | return "(unknown PM event)"; | |
388 | } | |
389 | } | |
390 | ||
391 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) | |
392 | { | |
393 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
394 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
395 | ", may wakeup" : ""); | |
396 | } | |
397 | ||
398 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
399 | int error) | |
400 | { | |
401 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
402 | kobject_name(&dev->kobj), pm_verb(state.event), info, error); | |
403 | } | |
404 | ||
ecf762b2 RW |
405 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
406 | { | |
407 | ktime_t calltime; | |
408 | s64 usecs64; | |
409 | int usecs; | |
410 | ||
411 | calltime = ktime_get(); | |
412 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
413 | do_div(usecs64, NSEC_PER_USEC); | |
414 | usecs = usecs64; | |
415 | if (usecs == 0) | |
416 | usecs = 1; | |
417 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
418 | info ?: "", info ? " " : "", pm_verb(state.event), | |
419 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
420 | } | |
421 | ||
cd59abfc AS |
422 | /*------------------------- Resume routines -------------------------*/ |
423 | ||
424 | /** | |
20d652d7 RW |
425 | * device_resume_noirq - Execute an "early resume" callback for given device. |
426 | * @dev: Device to handle. | |
427 | * @state: PM transition of the system being carried out. | |
cd59abfc | 428 | * |
20d652d7 RW |
429 | * The driver of @dev will not receive interrupts while this function is being |
430 | * executed. | |
cd59abfc | 431 | */ |
d1616302 | 432 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
cd59abfc AS |
433 | { |
434 | int error = 0; | |
435 | ||
436 | TRACE_DEVICE(dev); | |
437 | TRACE_RESUME(0); | |
438 | ||
33c33740 | 439 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
440 | pm_dev_dbg(dev, state, "EARLY "); |
441 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
775b64d2 | 442 | } |
33c33740 | 443 | |
775b64d2 RW |
444 | TRACE_RESUME(error); |
445 | return error; | |
446 | } | |
447 | ||
448 | /** | |
20d652d7 RW |
449 | * dpm_resume_noirq - Execute "early resume" callbacks for non-sysdev devices. |
450 | * @state: PM transition of the system being carried out. | |
775b64d2 | 451 | * |
20d652d7 RW |
452 | * Call the "noirq" resume handlers for all devices marked as DPM_OFF_IRQ and |
453 | * enable device drivers to receive interrupts. | |
775b64d2 | 454 | */ |
d1616302 | 455 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 456 | { |
1eede070 | 457 | struct device *dev; |
ecf762b2 | 458 | ktime_t starttime = ktime_get(); |
775b64d2 | 459 | |
32bdfac5 | 460 | mutex_lock(&dpm_list_mtx); |
3eb132c9 | 461 | transition_started = false; |
1eede070 RW |
462 | list_for_each_entry(dev, &dpm_list, power.entry) |
463 | if (dev->power.status > DPM_OFF) { | |
464 | int error; | |
775b64d2 | 465 | |
1eede070 | 466 | dev->power.status = DPM_OFF; |
d1616302 | 467 | error = device_resume_noirq(dev, state); |
1eede070 RW |
468 | if (error) |
469 | pm_dev_err(dev, state, " early", error); | |
470 | } | |
32bdfac5 | 471 | mutex_unlock(&dpm_list_mtx); |
ecf762b2 | 472 | dpm_show_time(starttime, state, "early"); |
2ed8d2b3 | 473 | resume_device_irqs(); |
775b64d2 | 474 | } |
d1616302 | 475 | EXPORT_SYMBOL_GPL(dpm_resume_noirq); |
775b64d2 | 476 | |
875ab0b7 RW |
477 | /** |
478 | * legacy_resume - Execute a legacy (bus or class) resume callback for device. | |
0a884223 RD |
479 | * @dev: Device to resume. |
480 | * @cb: Resume callback to execute. | |
875ab0b7 RW |
481 | */ |
482 | static int legacy_resume(struct device *dev, int (*cb)(struct device *dev)) | |
483 | { | |
484 | int error; | |
485 | ktime_t calltime; | |
486 | ||
487 | calltime = initcall_debug_start(dev); | |
488 | ||
489 | error = cb(dev); | |
490 | suspend_report_result(cb, error); | |
491 | ||
492 | initcall_debug_report(dev, calltime, error); | |
493 | ||
494 | return error; | |
495 | } | |
496 | ||
775b64d2 | 497 | /** |
5af84b82 | 498 | * __device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
499 | * @dev: Device to handle. |
500 | * @state: PM transition of the system being carried out. | |
5af84b82 | 501 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 502 | */ |
5af84b82 | 503 | static int __device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 RW |
504 | { |
505 | int error = 0; | |
506 | ||
507 | TRACE_DEVICE(dev); | |
508 | TRACE_RESUME(0); | |
cd59abfc | 509 | |
5af84b82 | 510 | dpm_wait(dev->parent, async); |
7a8d37a3 RW |
511 | down(&dev->sem); |
512 | ||
1eede070 RW |
513 | if (dev->bus) { |
514 | if (dev->bus->pm) { | |
515 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 516 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
517 | } else if (dev->bus->resume) { |
518 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 519 | error = legacy_resume(dev, dev->bus->resume); |
1eede070 RW |
520 | } |
521 | if (error) | |
522 | goto End; | |
cd59abfc AS |
523 | } |
524 | ||
1eede070 RW |
525 | if (dev->type) { |
526 | if (dev->type->pm) { | |
527 | pm_dev_dbg(dev, state, "type "); | |
528 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
529 | } |
530 | if (error) | |
531 | goto End; | |
cd59abfc AS |
532 | } |
533 | ||
1eede070 RW |
534 | if (dev->class) { |
535 | if (dev->class->pm) { | |
536 | pm_dev_dbg(dev, state, "class "); | |
537 | error = pm_op(dev, dev->class->pm, state); | |
538 | } else if (dev->class->resume) { | |
539 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 540 | error = legacy_resume(dev, dev->class->resume); |
1eede070 | 541 | } |
cd59abfc | 542 | } |
1eede070 | 543 | End: |
7a8d37a3 | 544 | up(&dev->sem); |
5af84b82 | 545 | complete_all(&dev->power.completion); |
7a8d37a3 | 546 | |
cd59abfc AS |
547 | TRACE_RESUME(error); |
548 | return error; | |
549 | } | |
550 | ||
5af84b82 RW |
551 | static void async_resume(void *data, async_cookie_t cookie) |
552 | { | |
553 | struct device *dev = (struct device *)data; | |
554 | int error; | |
555 | ||
556 | error = __device_resume(dev, pm_transition, true); | |
557 | if (error) | |
558 | pm_dev_err(dev, pm_transition, " async", error); | |
559 | put_device(dev); | |
560 | } | |
561 | ||
562 | static int device_resume(struct device *dev) | |
563 | { | |
564 | INIT_COMPLETION(dev->power.completion); | |
565 | ||
0e06b4a8 RW |
566 | if (pm_async_enabled && dev->power.async_suspend |
567 | && !pm_trace_is_enabled()) { | |
5af84b82 RW |
568 | get_device(dev); |
569 | async_schedule(async_resume, dev); | |
570 | return 0; | |
571 | } | |
572 | ||
573 | return __device_resume(dev, pm_transition, false); | |
574 | } | |
575 | ||
775b64d2 | 576 | /** |
20d652d7 RW |
577 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
578 | * @state: PM transition of the system being carried out. | |
775b64d2 | 579 | * |
20d652d7 RW |
580 | * Execute the appropriate "resume" callback for all devices whose status |
581 | * indicates that they are suspended. | |
1eede070 RW |
582 | */ |
583 | static void dpm_resume(pm_message_t state) | |
584 | { | |
585 | struct list_head list; | |
ecf762b2 | 586 | ktime_t starttime = ktime_get(); |
1eede070 RW |
587 | |
588 | INIT_LIST_HEAD(&list); | |
589 | mutex_lock(&dpm_list_mtx); | |
5af84b82 | 590 | pm_transition = state; |
1eede070 RW |
591 | while (!list_empty(&dpm_list)) { |
592 | struct device *dev = to_device(dpm_list.next); | |
593 | ||
594 | get_device(dev); | |
595 | if (dev->power.status >= DPM_OFF) { | |
596 | int error; | |
597 | ||
598 | dev->power.status = DPM_RESUMING; | |
599 | mutex_unlock(&dpm_list_mtx); | |
600 | ||
5af84b82 | 601 | error = device_resume(dev); |
1eede070 RW |
602 | |
603 | mutex_lock(&dpm_list_mtx); | |
604 | if (error) | |
605 | pm_dev_err(dev, state, "", error); | |
606 | } else if (dev->power.status == DPM_SUSPENDING) { | |
607 | /* Allow new children of the device to be registered */ | |
608 | dev->power.status = DPM_RESUMING; | |
609 | } | |
610 | if (!list_empty(&dev->power.entry)) | |
611 | list_move_tail(&dev->power.entry, &list); | |
612 | put_device(dev); | |
613 | } | |
614 | list_splice(&list, &dpm_list); | |
615 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 | 616 | async_synchronize_full(); |
ecf762b2 | 617 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
618 | } |
619 | ||
620 | /** | |
20d652d7 RW |
621 | * device_complete - Complete a PM transition for given device. |
622 | * @dev: Device to handle. | |
623 | * @state: PM transition of the system being carried out. | |
1eede070 | 624 | */ |
d1616302 | 625 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 RW |
626 | { |
627 | down(&dev->sem); | |
628 | ||
629 | if (dev->class && dev->class->pm && dev->class->pm->complete) { | |
630 | pm_dev_dbg(dev, state, "completing class "); | |
631 | dev->class->pm->complete(dev); | |
632 | } | |
633 | ||
634 | if (dev->type && dev->type->pm && dev->type->pm->complete) { | |
635 | pm_dev_dbg(dev, state, "completing type "); | |
636 | dev->type->pm->complete(dev); | |
637 | } | |
638 | ||
adf09493 | 639 | if (dev->bus && dev->bus->pm && dev->bus->pm->complete) { |
1eede070 | 640 | pm_dev_dbg(dev, state, "completing "); |
adf09493 | 641 | dev->bus->pm->complete(dev); |
1eede070 RW |
642 | } |
643 | ||
644 | up(&dev->sem); | |
645 | } | |
646 | ||
647 | /** | |
20d652d7 RW |
648 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
649 | * @state: PM transition of the system being carried out. | |
775b64d2 | 650 | * |
20d652d7 RW |
651 | * Execute the ->complete() callbacks for all devices whose PM status is not |
652 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 653 | */ |
1eede070 | 654 | static void dpm_complete(pm_message_t state) |
cd59abfc | 655 | { |
1eede070 RW |
656 | struct list_head list; |
657 | ||
658 | INIT_LIST_HEAD(&list); | |
cd59abfc | 659 | mutex_lock(&dpm_list_mtx); |
e528e876 | 660 | transition_started = false; |
1eede070 RW |
661 | while (!list_empty(&dpm_list)) { |
662 | struct device *dev = to_device(dpm_list.prev); | |
cd59abfc | 663 | |
1eede070 RW |
664 | get_device(dev); |
665 | if (dev->power.status > DPM_ON) { | |
666 | dev->power.status = DPM_ON; | |
667 | mutex_unlock(&dpm_list_mtx); | |
668 | ||
d1616302 | 669 | device_complete(dev, state); |
aa0baaef | 670 | pm_runtime_put_sync(dev); |
1eede070 RW |
671 | |
672 | mutex_lock(&dpm_list_mtx); | |
673 | } | |
674 | if (!list_empty(&dev->power.entry)) | |
675 | list_move(&dev->power.entry, &list); | |
676 | put_device(dev); | |
cd59abfc | 677 | } |
1eede070 | 678 | list_splice(&list, &dpm_list); |
cd59abfc AS |
679 | mutex_unlock(&dpm_list_mtx); |
680 | } | |
681 | ||
cd59abfc | 682 | /** |
20d652d7 RW |
683 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
684 | * @state: PM transition of the system being carried out. | |
cd59abfc | 685 | * |
20d652d7 RW |
686 | * Execute "resume" callbacks for all devices and complete the PM transition of |
687 | * the system. | |
cd59abfc | 688 | */ |
d1616302 | 689 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 690 | { |
775b64d2 | 691 | might_sleep(); |
1eede070 RW |
692 | dpm_resume(state); |
693 | dpm_complete(state); | |
cd59abfc | 694 | } |
d1616302 | 695 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
696 | |
697 | ||
698 | /*------------------------- Suspend routines -------------------------*/ | |
699 | ||
1eede070 | 700 | /** |
20d652d7 RW |
701 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
702 | * @sleep_state: PM message representing a sleep state. | |
703 | * | |
704 | * Return a PM message representing the resume event corresponding to given | |
705 | * sleep state. | |
1eede070 RW |
706 | */ |
707 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 708 | { |
1eede070 RW |
709 | switch (sleep_state.event) { |
710 | case PM_EVENT_SUSPEND: | |
711 | return PMSG_RESUME; | |
712 | case PM_EVENT_FREEZE: | |
713 | case PM_EVENT_QUIESCE: | |
714 | return PMSG_RECOVER; | |
715 | case PM_EVENT_HIBERNATE: | |
716 | return PMSG_RESTORE; | |
cd59abfc | 717 | } |
1eede070 | 718 | return PMSG_ON; |
cd59abfc AS |
719 | } |
720 | ||
721 | /** | |
20d652d7 RW |
722 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
723 | * @dev: Device to handle. | |
724 | * @state: PM transition of the system being carried out. | |
775b64d2 | 725 | * |
20d652d7 RW |
726 | * The driver of @dev will not receive interrupts while this function is being |
727 | * executed. | |
cd59abfc | 728 | */ |
d1616302 | 729 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 RW |
730 | { |
731 | int error = 0; | |
cd59abfc | 732 | |
33c33740 | 733 | if (dev->bus && dev->bus->pm) { |
1eede070 RW |
734 | pm_dev_dbg(dev, state, "LATE "); |
735 | error = pm_noirq_op(dev, dev->bus->pm, state); | |
775b64d2 RW |
736 | } |
737 | return error; | |
738 | } | |
739 | ||
740 | /** | |
20d652d7 RW |
741 | * dpm_suspend_noirq - Execute "late suspend" callbacks for non-sysdev devices. |
742 | * @state: PM transition of the system being carried out. | |
775b64d2 | 743 | * |
20d652d7 RW |
744 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
745 | * handlers for all non-sysdev devices. | |
775b64d2 | 746 | */ |
d1616302 | 747 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 748 | { |
1eede070 | 749 | struct device *dev; |
ecf762b2 | 750 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
751 | int error = 0; |
752 | ||
2ed8d2b3 | 753 | suspend_device_irqs(); |
32bdfac5 | 754 | mutex_lock(&dpm_list_mtx); |
1eede070 | 755 | list_for_each_entry_reverse(dev, &dpm_list, power.entry) { |
d1616302 | 756 | error = device_suspend_noirq(dev, state); |
775b64d2 | 757 | if (error) { |
1eede070 | 758 | pm_dev_err(dev, state, " late", error); |
775b64d2 RW |
759 | break; |
760 | } | |
1eede070 | 761 | dev->power.status = DPM_OFF_IRQ; |
775b64d2 | 762 | } |
32bdfac5 | 763 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 764 | if (error) |
d1616302 | 765 | dpm_resume_noirq(resume_event(state)); |
ecf762b2 RW |
766 | else |
767 | dpm_show_time(starttime, state, "late"); | |
775b64d2 RW |
768 | return error; |
769 | } | |
d1616302 | 770 | EXPORT_SYMBOL_GPL(dpm_suspend_noirq); |
775b64d2 | 771 | |
875ab0b7 RW |
772 | /** |
773 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
774 | * @dev: Device to suspend. |
775 | * @state: PM transition of the system being carried out. | |
776 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
777 | */ |
778 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
779 | int (*cb)(struct device *dev, pm_message_t state)) | |
780 | { | |
781 | int error; | |
782 | ktime_t calltime; | |
783 | ||
784 | calltime = initcall_debug_start(dev); | |
785 | ||
786 | error = cb(dev, state); | |
787 | suspend_report_result(cb, error); | |
788 | ||
789 | initcall_debug_report(dev, calltime, error); | |
790 | ||
791 | return error; | |
792 | } | |
793 | ||
5af84b82 RW |
794 | static int async_error; |
795 | ||
775b64d2 | 796 | /** |
20d652d7 RW |
797 | * device_suspend - Execute "suspend" callbacks for given device. |
798 | * @dev: Device to handle. | |
799 | * @state: PM transition of the system being carried out. | |
5af84b82 | 800 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 801 | */ |
5af84b82 | 802 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc AS |
803 | { |
804 | int error = 0; | |
805 | ||
5af84b82 | 806 | dpm_wait_for_children(dev, async); |
7a8d37a3 RW |
807 | down(&dev->sem); |
808 | ||
5af84b82 RW |
809 | if (async_error) |
810 | goto End; | |
811 | ||
1eede070 RW |
812 | if (dev->class) { |
813 | if (dev->class->pm) { | |
814 | pm_dev_dbg(dev, state, "class "); | |
815 | error = pm_op(dev, dev->class->pm, state); | |
816 | } else if (dev->class->suspend) { | |
817 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 818 | error = legacy_suspend(dev, state, dev->class->suspend); |
1eede070 RW |
819 | } |
820 | if (error) | |
821 | goto End; | |
cd59abfc AS |
822 | } |
823 | ||
1eede070 RW |
824 | if (dev->type) { |
825 | if (dev->type->pm) { | |
826 | pm_dev_dbg(dev, state, "type "); | |
827 | error = pm_op(dev, dev->type->pm, state); | |
1eede070 RW |
828 | } |
829 | if (error) | |
830 | goto End; | |
cd59abfc AS |
831 | } |
832 | ||
1eede070 RW |
833 | if (dev->bus) { |
834 | if (dev->bus->pm) { | |
835 | pm_dev_dbg(dev, state, ""); | |
adf09493 | 836 | error = pm_op(dev, dev->bus->pm, state); |
1eede070 RW |
837 | } else if (dev->bus->suspend) { |
838 | pm_dev_dbg(dev, state, "legacy "); | |
875ab0b7 | 839 | error = legacy_suspend(dev, state, dev->bus->suspend); |
1eede070 | 840 | } |
cd59abfc | 841 | } |
5af84b82 RW |
842 | |
843 | if (!error) | |
844 | dev->power.status = DPM_OFF; | |
845 | ||
1eede070 | 846 | End: |
7a8d37a3 | 847 | up(&dev->sem); |
5af84b82 | 848 | complete_all(&dev->power.completion); |
7a8d37a3 | 849 | |
cd59abfc AS |
850 | return error; |
851 | } | |
852 | ||
5af84b82 RW |
853 | static void async_suspend(void *data, async_cookie_t cookie) |
854 | { | |
855 | struct device *dev = (struct device *)data; | |
856 | int error; | |
857 | ||
858 | error = __device_suspend(dev, pm_transition, true); | |
859 | if (error) { | |
860 | pm_dev_err(dev, pm_transition, " async", error); | |
861 | async_error = error; | |
862 | } | |
863 | ||
864 | put_device(dev); | |
865 | } | |
866 | ||
867 | static int device_suspend(struct device *dev) | |
868 | { | |
869 | INIT_COMPLETION(dev->power.completion); | |
870 | ||
0e06b4a8 | 871 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
872 | get_device(dev); |
873 | async_schedule(async_suspend, dev); | |
874 | return 0; | |
875 | } | |
876 | ||
877 | return __device_suspend(dev, pm_transition, false); | |
878 | } | |
879 | ||
cd59abfc | 880 | /** |
20d652d7 RW |
881 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
882 | * @state: PM transition of the system being carried out. | |
cd59abfc | 883 | */ |
775b64d2 | 884 | static int dpm_suspend(pm_message_t state) |
cd59abfc | 885 | { |
1eede070 | 886 | struct list_head list; |
ecf762b2 | 887 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
888 | int error = 0; |
889 | ||
1eede070 | 890 | INIT_LIST_HEAD(&list); |
cd59abfc | 891 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
892 | pm_transition = state; |
893 | async_error = 0; | |
1eede070 RW |
894 | while (!list_empty(&dpm_list)) { |
895 | struct device *dev = to_device(dpm_list.prev); | |
58aca232 | 896 | |
1eede070 | 897 | get_device(dev); |
cd59abfc | 898 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 899 | |
5af84b82 | 900 | error = device_suspend(dev); |
1eede070 | 901 | |
1b3cbec1 | 902 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 903 | if (error) { |
1eede070 RW |
904 | pm_dev_err(dev, state, "", error); |
905 | put_device(dev); | |
775b64d2 RW |
906 | break; |
907 | } | |
7a8d37a3 | 908 | if (!list_empty(&dev->power.entry)) |
1eede070 RW |
909 | list_move(&dev->power.entry, &list); |
910 | put_device(dev); | |
5af84b82 RW |
911 | if (async_error) |
912 | break; | |
cd59abfc | 913 | } |
1eede070 | 914 | list_splice(&list, dpm_list.prev); |
cd59abfc | 915 | mutex_unlock(&dpm_list_mtx); |
5af84b82 RW |
916 | async_synchronize_full(); |
917 | if (!error) | |
918 | error = async_error; | |
ecf762b2 RW |
919 | if (!error) |
920 | dpm_show_time(starttime, state, NULL); | |
1eede070 RW |
921 | return error; |
922 | } | |
923 | ||
924 | /** | |
20d652d7 RW |
925 | * device_prepare - Prepare a device for system power transition. |
926 | * @dev: Device to handle. | |
927 | * @state: PM transition of the system being carried out. | |
928 | * | |
929 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
930 | * device may be registered after this function has returned. | |
1eede070 | 931 | */ |
d1616302 | 932 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 RW |
933 | { |
934 | int error = 0; | |
935 | ||
936 | down(&dev->sem); | |
937 | ||
adf09493 | 938 | if (dev->bus && dev->bus->pm && dev->bus->pm->prepare) { |
1eede070 | 939 | pm_dev_dbg(dev, state, "preparing "); |
adf09493 RW |
940 | error = dev->bus->pm->prepare(dev); |
941 | suspend_report_result(dev->bus->pm->prepare, error); | |
1eede070 RW |
942 | if (error) |
943 | goto End; | |
944 | } | |
945 | ||
946 | if (dev->type && dev->type->pm && dev->type->pm->prepare) { | |
947 | pm_dev_dbg(dev, state, "preparing type "); | |
948 | error = dev->type->pm->prepare(dev); | |
949 | suspend_report_result(dev->type->pm->prepare, error); | |
950 | if (error) | |
951 | goto End; | |
952 | } | |
953 | ||
954 | if (dev->class && dev->class->pm && dev->class->pm->prepare) { | |
955 | pm_dev_dbg(dev, state, "preparing class "); | |
956 | error = dev->class->pm->prepare(dev); | |
957 | suspend_report_result(dev->class->pm->prepare, error); | |
958 | } | |
959 | End: | |
960 | up(&dev->sem); | |
961 | ||
962 | return error; | |
963 | } | |
cd59abfc | 964 | |
1eede070 | 965 | /** |
20d652d7 RW |
966 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
967 | * @state: PM transition of the system being carried out. | |
1eede070 | 968 | * |
20d652d7 | 969 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 RW |
970 | */ |
971 | static int dpm_prepare(pm_message_t state) | |
972 | { | |
973 | struct list_head list; | |
974 | int error = 0; | |
975 | ||
976 | INIT_LIST_HEAD(&list); | |
977 | mutex_lock(&dpm_list_mtx); | |
978 | transition_started = true; | |
979 | while (!list_empty(&dpm_list)) { | |
980 | struct device *dev = to_device(dpm_list.next); | |
981 | ||
982 | get_device(dev); | |
983 | dev->power.status = DPM_PREPARING; | |
984 | mutex_unlock(&dpm_list_mtx); | |
985 | ||
5e928f77 RW |
986 | pm_runtime_get_noresume(dev); |
987 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) { | |
988 | /* Wake-up requested during system sleep transition. */ | |
aa0baaef | 989 | pm_runtime_put_sync(dev); |
5e928f77 RW |
990 | error = -EBUSY; |
991 | } else { | |
992 | error = device_prepare(dev, state); | |
993 | } | |
1eede070 RW |
994 | |
995 | mutex_lock(&dpm_list_mtx); | |
996 | if (error) { | |
997 | dev->power.status = DPM_ON; | |
998 | if (error == -EAGAIN) { | |
999 | put_device(dev); | |
886a7a33 | 1000 | error = 0; |
1eede070 RW |
1001 | continue; |
1002 | } | |
1003 | printk(KERN_ERR "PM: Failed to prepare device %s " | |
1004 | "for power transition: error %d\n", | |
1005 | kobject_name(&dev->kobj), error); | |
1006 | put_device(dev); | |
1007 | break; | |
1008 | } | |
1009 | dev->power.status = DPM_SUSPENDING; | |
1010 | if (!list_empty(&dev->power.entry)) | |
1011 | list_move_tail(&dev->power.entry, &list); | |
1012 | put_device(dev); | |
1013 | } | |
1014 | list_splice(&list, &dpm_list); | |
1015 | mutex_unlock(&dpm_list_mtx); | |
cd59abfc AS |
1016 | return error; |
1017 | } | |
1018 | ||
775b64d2 | 1019 | /** |
20d652d7 RW |
1020 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1021 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1022 | * |
20d652d7 RW |
1023 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1024 | * callbacks for them. | |
775b64d2 | 1025 | */ |
d1616302 | 1026 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1027 | { |
1028 | int error; | |
cd59abfc | 1029 | |
775b64d2 | 1030 | might_sleep(); |
1eede070 RW |
1031 | error = dpm_prepare(state); |
1032 | if (!error) | |
1033 | error = dpm_suspend(state); | |
cd59abfc | 1034 | return error; |
cd59abfc | 1035 | } |
d1616302 | 1036 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1037 | |
1038 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1039 | { | |
c80cfb04 BH |
1040 | if (ret) |
1041 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1042 | } |
1043 | EXPORT_SYMBOL_GPL(__suspend_report_result); |