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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. | |
b595076a | 11 | * This will initialize the embedded device_pm_info object in the device |
1da177e4 LT |
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> |
1b6bc32f | 22 | #include <linux/export.h> |
11048dcf | 23 | #include <linux/mutex.h> |
cd59abfc | 24 | #include <linux/pm.h> |
5e928f77 | 25 | #include <linux/pm_runtime.h> |
cd59abfc | 26 | #include <linux/resume-trace.h> |
2ed8d2b3 | 27 | #include <linux/interrupt.h> |
f2511774 | 28 | #include <linux/sched.h> |
5af84b82 | 29 | #include <linux/async.h> |
1e75227e | 30 | #include <linux/suspend.h> |
53644677 | 31 | #include <trace/events/power.h> |
8651f97b | 32 | #include <linux/cpuidle.h> |
70fea60d BG |
33 | #include <linux/timer.h> |
34 | ||
cd59abfc | 35 | #include "../base.h" |
1da177e4 LT |
36 | #include "power.h" |
37 | ||
9cf519d1 RW |
38 | typedef int (*pm_callback_t)(struct device *); |
39 | ||
775b64d2 | 40 | /* |
1eede070 | 41 | * The entries in the dpm_list list are in a depth first order, simply |
775b64d2 RW |
42 | * because children are guaranteed to be discovered after parents, and |
43 | * are inserted at the back of the list on discovery. | |
44 | * | |
8e9394ce GKH |
45 | * Since device_pm_add() may be called with a device lock held, |
46 | * we must never try to acquire a device lock while holding | |
775b64d2 RW |
47 | * dpm_list_mutex. |
48 | */ | |
49 | ||
1eede070 | 50 | LIST_HEAD(dpm_list); |
7664e969 SK |
51 | static LIST_HEAD(dpm_prepared_list); |
52 | static LIST_HEAD(dpm_suspended_list); | |
53 | static LIST_HEAD(dpm_late_early_list); | |
54 | static LIST_HEAD(dpm_noirq_list); | |
1da177e4 | 55 | |
2a77c46d | 56 | struct suspend_stats suspend_stats; |
cd59abfc | 57 | static DEFINE_MUTEX(dpm_list_mtx); |
5af84b82 | 58 | static pm_message_t pm_transition; |
1da177e4 | 59 | |
098dff73 RW |
60 | static int async_error; |
61 | ||
53644677 SK |
62 | static char *pm_verb(int event) |
63 | { | |
64 | switch (event) { | |
65 | case PM_EVENT_SUSPEND: | |
66 | return "suspend"; | |
67 | case PM_EVENT_RESUME: | |
68 | return "resume"; | |
69 | case PM_EVENT_FREEZE: | |
70 | return "freeze"; | |
71 | case PM_EVENT_QUIESCE: | |
72 | return "quiesce"; | |
73 | case PM_EVENT_HIBERNATE: | |
74 | return "hibernate"; | |
75 | case PM_EVENT_THAW: | |
76 | return "thaw"; | |
77 | case PM_EVENT_RESTORE: | |
78 | return "restore"; | |
79 | case PM_EVENT_RECOVER: | |
80 | return "recover"; | |
81 | default: | |
82 | return "(unknown PM event)"; | |
83 | } | |
84 | } | |
85 | ||
5e928f77 | 86 | /** |
e91c11b1 | 87 | * device_pm_sleep_init - Initialize system suspend-related device fields. |
5e928f77 RW |
88 | * @dev: Device object being initialized. |
89 | */ | |
e91c11b1 | 90 | void device_pm_sleep_init(struct device *dev) |
5e928f77 | 91 | { |
f76b168b | 92 | dev->power.is_prepared = false; |
6d0e0e84 | 93 | dev->power.is_suspended = false; |
5af84b82 | 94 | init_completion(&dev->power.completion); |
152e1d59 | 95 | complete_all(&dev->power.completion); |
074037ec | 96 | dev->power.wakeup = NULL; |
22110faf | 97 | INIT_LIST_HEAD(&dev->power.entry); |
5e928f77 RW |
98 | } |
99 | ||
1eede070 | 100 | /** |
20d652d7 | 101 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
102 | */ |
103 | void device_pm_lock(void) | |
104 | { | |
105 | mutex_lock(&dpm_list_mtx); | |
106 | } | |
107 | ||
108 | /** | |
20d652d7 | 109 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
110 | */ |
111 | void device_pm_unlock(void) | |
112 | { | |
113 | mutex_unlock(&dpm_list_mtx); | |
114 | } | |
075c1771 | 115 | |
775b64d2 | 116 | /** |
20d652d7 RW |
117 | * device_pm_add - Add a device to the PM core's list of active devices. |
118 | * @dev: Device to add to the list. | |
775b64d2 | 119 | */ |
3b98aeaf | 120 | void device_pm_add(struct device *dev) |
1da177e4 | 121 | { |
1da177e4 | 122 | pr_debug("PM: Adding info for %s:%s\n", |
5c1a07ab | 123 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
11048dcf | 124 | mutex_lock(&dpm_list_mtx); |
f76b168b | 125 | if (dev->parent && dev->parent->power.is_prepared) |
b64959e6 RW |
126 | dev_warn(dev, "parent %s should not be sleeping\n", |
127 | dev_name(dev->parent)); | |
3b98aeaf | 128 | list_add_tail(&dev->power.entry, &dpm_list); |
1a9a9152 | 129 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
130 | } |
131 | ||
775b64d2 | 132 | /** |
20d652d7 RW |
133 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
134 | * @dev: Device to be removed from the list. | |
775b64d2 | 135 | */ |
9cddad77 | 136 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
137 | { |
138 | pr_debug("PM: Removing info for %s:%s\n", | |
5c1a07ab | 139 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
5af84b82 | 140 | complete_all(&dev->power.completion); |
11048dcf | 141 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 142 | list_del_init(&dev->power.entry); |
11048dcf | 143 | mutex_unlock(&dpm_list_mtx); |
074037ec | 144 | device_wakeup_disable(dev); |
5e928f77 | 145 | pm_runtime_remove(dev); |
775b64d2 RW |
146 | } |
147 | ||
ffa6a705 | 148 | /** |
20d652d7 RW |
149 | * device_pm_move_before - Move device in the PM core's list of active devices. |
150 | * @deva: Device to move in dpm_list. | |
151 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
152 | */ |
153 | void device_pm_move_before(struct device *deva, struct device *devb) | |
154 | { | |
155 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
5c1a07ab RW |
156 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
157 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
158 | /* Delete deva from dpm_list and reinsert before devb. */ |
159 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
160 | } | |
161 | ||
162 | /** | |
20d652d7 RW |
163 | * device_pm_move_after - Move device in the PM core's list of active devices. |
164 | * @deva: Device to move in dpm_list. | |
165 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
166 | */ |
167 | void device_pm_move_after(struct device *deva, struct device *devb) | |
168 | { | |
169 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
5c1a07ab RW |
170 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
171 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
172 | /* Delete deva from dpm_list and reinsert after devb. */ |
173 | list_move(&deva->power.entry, &devb->power.entry); | |
174 | } | |
175 | ||
176 | /** | |
20d652d7 RW |
177 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
178 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
179 | */ |
180 | void device_pm_move_last(struct device *dev) | |
181 | { | |
182 | pr_debug("PM: Moving %s:%s to end of list\n", | |
5c1a07ab | 183 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
ffa6a705 CH |
184 | list_move_tail(&dev->power.entry, &dpm_list); |
185 | } | |
186 | ||
875ab0b7 RW |
187 | static ktime_t initcall_debug_start(struct device *dev) |
188 | { | |
189 | ktime_t calltime = ktime_set(0, 0); | |
190 | ||
b2df1d4f | 191 | if (pm_print_times_enabled) { |
0c6aebe3 RW |
192 | pr_info("calling %s+ @ %i, parent: %s\n", |
193 | dev_name(dev), task_pid_nr(current), | |
194 | dev->parent ? dev_name(dev->parent) : "none"); | |
875ab0b7 RW |
195 | calltime = ktime_get(); |
196 | } | |
197 | ||
198 | return calltime; | |
199 | } | |
200 | ||
201 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
53644677 | 202 | int error, pm_message_t state, char *info) |
875ab0b7 | 203 | { |
53644677 SK |
204 | ktime_t rettime; |
205 | s64 nsecs; | |
206 | ||
207 | rettime = ktime_get(); | |
208 | nsecs = (s64) ktime_to_ns(ktime_sub(rettime, calltime)); | |
875ab0b7 | 209 | |
b2df1d4f | 210 | if (pm_print_times_enabled) { |
875ab0b7 | 211 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), |
53644677 | 212 | error, (unsigned long long)nsecs >> 10); |
875ab0b7 | 213 | } |
53644677 SK |
214 | |
215 | trace_device_pm_report_time(dev, info, nsecs, pm_verb(state.event), | |
216 | error); | |
875ab0b7 RW |
217 | } |
218 | ||
5af84b82 RW |
219 | /** |
220 | * dpm_wait - Wait for a PM operation to complete. | |
221 | * @dev: Device to wait for. | |
222 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
223 | */ | |
224 | static void dpm_wait(struct device *dev, bool async) | |
225 | { | |
226 | if (!dev) | |
227 | return; | |
228 | ||
0e06b4a8 | 229 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
230 | wait_for_completion(&dev->power.completion); |
231 | } | |
232 | ||
233 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
234 | { | |
235 | dpm_wait(dev, *((bool *)async_ptr)); | |
236 | return 0; | |
237 | } | |
238 | ||
239 | static void dpm_wait_for_children(struct device *dev, bool async) | |
240 | { | |
241 | device_for_each_child(dev, &async, dpm_wait_fn); | |
242 | } | |
243 | ||
1eede070 | 244 | /** |
9cf519d1 | 245 | * pm_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
246 | * @ops: PM operations to choose from. |
247 | * @state: PM transition of the system being carried out. | |
1eede070 | 248 | */ |
9cf519d1 | 249 | static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 250 | { |
1eede070 RW |
251 | switch (state.event) { |
252 | #ifdef CONFIG_SUSPEND | |
253 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 254 | return ops->suspend; |
1eede070 | 255 | case PM_EVENT_RESUME: |
9cf519d1 | 256 | return ops->resume; |
1eede070 | 257 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 258 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
259 | case PM_EVENT_FREEZE: |
260 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 261 | return ops->freeze; |
1eede070 | 262 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 263 | return ops->poweroff; |
1eede070 RW |
264 | case PM_EVENT_THAW: |
265 | case PM_EVENT_RECOVER: | |
9cf519d1 | 266 | return ops->thaw; |
1eede070 RW |
267 | break; |
268 | case PM_EVENT_RESTORE: | |
9cf519d1 | 269 | return ops->restore; |
1f112cee | 270 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 271 | } |
f2511774 | 272 | |
9cf519d1 | 273 | return NULL; |
1eede070 RW |
274 | } |
275 | ||
cf579dfb RW |
276 | /** |
277 | * pm_late_early_op - Return the PM operation appropriate for given PM event. | |
278 | * @ops: PM operations to choose from. | |
279 | * @state: PM transition of the system being carried out. | |
280 | * | |
281 | * Runtime PM is disabled for @dev while this function is being executed. | |
282 | */ | |
283 | static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops, | |
284 | pm_message_t state) | |
285 | { | |
286 | switch (state.event) { | |
287 | #ifdef CONFIG_SUSPEND | |
288 | case PM_EVENT_SUSPEND: | |
289 | return ops->suspend_late; | |
290 | case PM_EVENT_RESUME: | |
291 | return ops->resume_early; | |
292 | #endif /* CONFIG_SUSPEND */ | |
293 | #ifdef CONFIG_HIBERNATE_CALLBACKS | |
294 | case PM_EVENT_FREEZE: | |
295 | case PM_EVENT_QUIESCE: | |
296 | return ops->freeze_late; | |
297 | case PM_EVENT_HIBERNATE: | |
298 | return ops->poweroff_late; | |
299 | case PM_EVENT_THAW: | |
300 | case PM_EVENT_RECOVER: | |
301 | return ops->thaw_early; | |
302 | case PM_EVENT_RESTORE: | |
303 | return ops->restore_early; | |
304 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ | |
305 | } | |
306 | ||
307 | return NULL; | |
308 | } | |
309 | ||
1eede070 | 310 | /** |
9cf519d1 | 311 | * pm_noirq_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
312 | * @ops: PM operations to choose from. |
313 | * @state: PM transition of the system being carried out. | |
1eede070 | 314 | * |
20d652d7 RW |
315 | * The driver of @dev will not receive interrupts while this function is being |
316 | * executed. | |
1eede070 | 317 | */ |
9cf519d1 | 318 | static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 319 | { |
1eede070 RW |
320 | switch (state.event) { |
321 | #ifdef CONFIG_SUSPEND | |
322 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 323 | return ops->suspend_noirq; |
1eede070 | 324 | case PM_EVENT_RESUME: |
9cf519d1 | 325 | return ops->resume_noirq; |
1eede070 | 326 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 327 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
328 | case PM_EVENT_FREEZE: |
329 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 330 | return ops->freeze_noirq; |
1eede070 | 331 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 332 | return ops->poweroff_noirq; |
1eede070 RW |
333 | case PM_EVENT_THAW: |
334 | case PM_EVENT_RECOVER: | |
9cf519d1 | 335 | return ops->thaw_noirq; |
1eede070 | 336 | case PM_EVENT_RESTORE: |
9cf519d1 | 337 | return ops->restore_noirq; |
1f112cee | 338 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 339 | } |
f2511774 | 340 | |
9cf519d1 | 341 | return NULL; |
1eede070 RW |
342 | } |
343 | ||
1eede070 RW |
344 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) |
345 | { | |
346 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
347 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
348 | ", may wakeup" : ""); | |
349 | } | |
350 | ||
351 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
352 | int error) | |
353 | { | |
354 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
5c1a07ab | 355 | dev_name(dev), pm_verb(state.event), info, error); |
1eede070 RW |
356 | } |
357 | ||
ecf762b2 RW |
358 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
359 | { | |
360 | ktime_t calltime; | |
0702d9ee | 361 | u64 usecs64; |
ecf762b2 RW |
362 | int usecs; |
363 | ||
364 | calltime = ktime_get(); | |
365 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
366 | do_div(usecs64, NSEC_PER_USEC); | |
367 | usecs = usecs64; | |
368 | if (usecs == 0) | |
369 | usecs = 1; | |
370 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
371 | info ?: "", info ? " " : "", pm_verb(state.event), | |
372 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
373 | } | |
374 | ||
9cf519d1 RW |
375 | static int dpm_run_callback(pm_callback_t cb, struct device *dev, |
376 | pm_message_t state, char *info) | |
377 | { | |
378 | ktime_t calltime; | |
379 | int error; | |
380 | ||
381 | if (!cb) | |
382 | return 0; | |
383 | ||
384 | calltime = initcall_debug_start(dev); | |
385 | ||
386 | pm_dev_dbg(dev, state, info); | |
387 | error = cb(dev); | |
388 | suspend_report_result(cb, error); | |
389 | ||
53644677 | 390 | initcall_debug_report(dev, calltime, error, state, info); |
9cf519d1 RW |
391 | |
392 | return error; | |
393 | } | |
394 | ||
70fea60d BG |
395 | #ifdef CONFIG_DPM_WATCHDOG |
396 | struct dpm_watchdog { | |
397 | struct device *dev; | |
398 | struct task_struct *tsk; | |
399 | struct timer_list timer; | |
400 | }; | |
401 | ||
402 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \ | |
403 | struct dpm_watchdog wd | |
404 | ||
405 | /** | |
406 | * dpm_watchdog_handler - Driver suspend / resume watchdog handler. | |
407 | * @data: Watchdog object address. | |
408 | * | |
409 | * Called when a driver has timed out suspending or resuming. | |
410 | * There's not much we can do here to recover so panic() to | |
411 | * capture a crash-dump in pstore. | |
412 | */ | |
413 | static void dpm_watchdog_handler(unsigned long data) | |
414 | { | |
415 | struct dpm_watchdog *wd = (void *)data; | |
416 | ||
417 | dev_emerg(wd->dev, "**** DPM device timeout ****\n"); | |
418 | show_stack(wd->tsk, NULL); | |
419 | panic("%s %s: unrecoverable failure\n", | |
420 | dev_driver_string(wd->dev), dev_name(wd->dev)); | |
421 | } | |
422 | ||
423 | /** | |
424 | * dpm_watchdog_set - Enable pm watchdog for given device. | |
425 | * @wd: Watchdog. Must be allocated on the stack. | |
426 | * @dev: Device to handle. | |
427 | */ | |
428 | static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev) | |
429 | { | |
430 | struct timer_list *timer = &wd->timer; | |
431 | ||
432 | wd->dev = dev; | |
433 | wd->tsk = current; | |
434 | ||
435 | init_timer_on_stack(timer); | |
436 | /* use same timeout value for both suspend and resume */ | |
437 | timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT; | |
438 | timer->function = dpm_watchdog_handler; | |
439 | timer->data = (unsigned long)wd; | |
440 | add_timer(timer); | |
441 | } | |
442 | ||
443 | /** | |
444 | * dpm_watchdog_clear - Disable suspend/resume watchdog. | |
445 | * @wd: Watchdog to disable. | |
446 | */ | |
447 | static void dpm_watchdog_clear(struct dpm_watchdog *wd) | |
448 | { | |
449 | struct timer_list *timer = &wd->timer; | |
450 | ||
451 | del_timer_sync(timer); | |
452 | destroy_timer_on_stack(timer); | |
453 | } | |
454 | #else | |
455 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) | |
456 | #define dpm_watchdog_set(x, y) | |
457 | #define dpm_watchdog_clear(x) | |
458 | #endif | |
459 | ||
cd59abfc AS |
460 | /*------------------------- Resume routines -------------------------*/ |
461 | ||
462 | /** | |
20d652d7 RW |
463 | * device_resume_noirq - Execute an "early resume" callback for given device. |
464 | * @dev: Device to handle. | |
465 | * @state: PM transition of the system being carried out. | |
cd59abfc | 466 | * |
20d652d7 RW |
467 | * The driver of @dev will not receive interrupts while this function is being |
468 | * executed. | |
cd59abfc | 469 | */ |
d1616302 | 470 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
cd59abfc | 471 | { |
9cf519d1 RW |
472 | pm_callback_t callback = NULL; |
473 | char *info = NULL; | |
cd59abfc AS |
474 | int error = 0; |
475 | ||
476 | TRACE_DEVICE(dev); | |
477 | TRACE_RESUME(0); | |
478 | ||
dbf37414 RW |
479 | if (dev->power.syscore) |
480 | goto Out; | |
481 | ||
564b905a | 482 | if (dev->pm_domain) { |
cf579dfb | 483 | info = "noirq power domain "; |
9cf519d1 | 484 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 485 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 486 | info = "noirq type "; |
9cf519d1 | 487 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 488 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 489 | info = "noirq class "; |
9cf519d1 | 490 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 491 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 492 | info = "noirq bus "; |
9cf519d1 | 493 | callback = pm_noirq_op(dev->bus->pm, state); |
e7176a37 DB |
494 | } |
495 | ||
35cd133c | 496 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 497 | info = "noirq driver "; |
35cd133c RW |
498 | callback = pm_noirq_op(dev->driver->pm, state); |
499 | } | |
500 | ||
9cf519d1 RW |
501 | error = dpm_run_callback(callback, dev, state, info); |
502 | ||
dbf37414 | 503 | Out: |
775b64d2 RW |
504 | TRACE_RESUME(error); |
505 | return error; | |
506 | } | |
507 | ||
508 | /** | |
cf579dfb | 509 | * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices. |
20d652d7 | 510 | * @state: PM transition of the system being carried out. |
775b64d2 | 511 | * |
cf579dfb | 512 | * Call the "noirq" resume handlers for all devices in dpm_noirq_list and |
20d652d7 | 513 | * enable device drivers to receive interrupts. |
775b64d2 | 514 | */ |
cf579dfb | 515 | static void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 516 | { |
ecf762b2 | 517 | ktime_t starttime = ktime_get(); |
775b64d2 | 518 | |
32bdfac5 | 519 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
520 | while (!list_empty(&dpm_noirq_list)) { |
521 | struct device *dev = to_device(dpm_noirq_list.next); | |
5b219a51 | 522 | int error; |
d08a5ace RW |
523 | |
524 | get_device(dev); | |
cf579dfb | 525 | list_move_tail(&dev->power.entry, &dpm_late_early_list); |
5b219a51 | 526 | mutex_unlock(&dpm_list_mtx); |
d08a5ace | 527 | |
5b219a51 | 528 | error = device_resume_noirq(dev, state); |
2a77c46d SL |
529 | if (error) { |
530 | suspend_stats.failed_resume_noirq++; | |
531 | dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); | |
532 | dpm_save_failed_dev(dev_name(dev)); | |
cf579dfb RW |
533 | pm_dev_err(dev, state, " noirq", error); |
534 | } | |
535 | ||
536 | mutex_lock(&dpm_list_mtx); | |
537 | put_device(dev); | |
538 | } | |
539 | mutex_unlock(&dpm_list_mtx); | |
540 | dpm_show_time(starttime, state, "noirq"); | |
541 | resume_device_irqs(); | |
8651f97b | 542 | cpuidle_resume(); |
cf579dfb RW |
543 | } |
544 | ||
545 | /** | |
546 | * device_resume_early - Execute an "early resume" callback for given device. | |
547 | * @dev: Device to handle. | |
548 | * @state: PM transition of the system being carried out. | |
549 | * | |
550 | * Runtime PM is disabled for @dev while this function is being executed. | |
551 | */ | |
552 | static int device_resume_early(struct device *dev, pm_message_t state) | |
553 | { | |
554 | pm_callback_t callback = NULL; | |
555 | char *info = NULL; | |
556 | int error = 0; | |
557 | ||
558 | TRACE_DEVICE(dev); | |
559 | TRACE_RESUME(0); | |
560 | ||
dbf37414 RW |
561 | if (dev->power.syscore) |
562 | goto Out; | |
563 | ||
cf579dfb RW |
564 | if (dev->pm_domain) { |
565 | info = "early power domain "; | |
566 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
567 | } else if (dev->type && dev->type->pm) { | |
568 | info = "early type "; | |
569 | callback = pm_late_early_op(dev->type->pm, state); | |
570 | } else if (dev->class && dev->class->pm) { | |
571 | info = "early class "; | |
572 | callback = pm_late_early_op(dev->class->pm, state); | |
573 | } else if (dev->bus && dev->bus->pm) { | |
574 | info = "early bus "; | |
575 | callback = pm_late_early_op(dev->bus->pm, state); | |
576 | } | |
577 | ||
578 | if (!callback && dev->driver && dev->driver->pm) { | |
579 | info = "early driver "; | |
580 | callback = pm_late_early_op(dev->driver->pm, state); | |
581 | } | |
582 | ||
583 | error = dpm_run_callback(callback, dev, state, info); | |
584 | ||
dbf37414 | 585 | Out: |
cf579dfb | 586 | TRACE_RESUME(error); |
9f6d8f6a RW |
587 | |
588 | pm_runtime_enable(dev); | |
cf579dfb RW |
589 | return error; |
590 | } | |
591 | ||
592 | /** | |
593 | * dpm_resume_early - Execute "early resume" callbacks for all devices. | |
594 | * @state: PM transition of the system being carried out. | |
595 | */ | |
596 | static void dpm_resume_early(pm_message_t state) | |
597 | { | |
598 | ktime_t starttime = ktime_get(); | |
599 | ||
600 | mutex_lock(&dpm_list_mtx); | |
601 | while (!list_empty(&dpm_late_early_list)) { | |
602 | struct device *dev = to_device(dpm_late_early_list.next); | |
603 | int error; | |
604 | ||
605 | get_device(dev); | |
606 | list_move_tail(&dev->power.entry, &dpm_suspended_list); | |
607 | mutex_unlock(&dpm_list_mtx); | |
608 | ||
609 | error = device_resume_early(dev, state); | |
610 | if (error) { | |
611 | suspend_stats.failed_resume_early++; | |
612 | dpm_save_failed_step(SUSPEND_RESUME_EARLY); | |
613 | dpm_save_failed_dev(dev_name(dev)); | |
5b219a51 | 614 | pm_dev_err(dev, state, " early", error); |
2a77c46d | 615 | } |
d08a5ace | 616 | |
5b219a51 | 617 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
618 | put_device(dev); |
619 | } | |
32bdfac5 | 620 | mutex_unlock(&dpm_list_mtx); |
ecf762b2 | 621 | dpm_show_time(starttime, state, "early"); |
775b64d2 | 622 | } |
cf579dfb RW |
623 | |
624 | /** | |
625 | * dpm_resume_start - Execute "noirq" and "early" device callbacks. | |
626 | * @state: PM transition of the system being carried out. | |
627 | */ | |
628 | void dpm_resume_start(pm_message_t state) | |
629 | { | |
630 | dpm_resume_noirq(state); | |
631 | dpm_resume_early(state); | |
632 | } | |
633 | EXPORT_SYMBOL_GPL(dpm_resume_start); | |
775b64d2 RW |
634 | |
635 | /** | |
97df8c12 | 636 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
637 | * @dev: Device to handle. |
638 | * @state: PM transition of the system being carried out. | |
5af84b82 | 639 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 640 | */ |
97df8c12 | 641 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 642 | { |
9cf519d1 RW |
643 | pm_callback_t callback = NULL; |
644 | char *info = NULL; | |
775b64d2 | 645 | int error = 0; |
70fea60d | 646 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
775b64d2 RW |
647 | |
648 | TRACE_DEVICE(dev); | |
649 | TRACE_RESUME(0); | |
cd59abfc | 650 | |
dbf37414 RW |
651 | if (dev->power.syscore) |
652 | goto Complete; | |
653 | ||
5af84b82 | 654 | dpm_wait(dev->parent, async); |
70fea60d | 655 | dpm_watchdog_set(&wd, dev); |
8e9394ce | 656 | device_lock(dev); |
7a8d37a3 | 657 | |
f76b168b AS |
658 | /* |
659 | * This is a fib. But we'll allow new children to be added below | |
660 | * a resumed device, even if the device hasn't been completed yet. | |
661 | */ | |
662 | dev->power.is_prepared = false; | |
97df8c12 | 663 | |
6d0e0e84 AS |
664 | if (!dev->power.is_suspended) |
665 | goto Unlock; | |
666 | ||
564b905a | 667 | if (dev->pm_domain) { |
9cf519d1 RW |
668 | info = "power domain "; |
669 | callback = pm_op(&dev->pm_domain->ops, state); | |
35cd133c | 670 | goto Driver; |
7538e3db RW |
671 | } |
672 | ||
9659cc06 | 673 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
674 | info = "type "; |
675 | callback = pm_op(dev->type->pm, state); | |
35cd133c | 676 | goto Driver; |
cd59abfc AS |
677 | } |
678 | ||
1eede070 RW |
679 | if (dev->class) { |
680 | if (dev->class->pm) { | |
9cf519d1 RW |
681 | info = "class "; |
682 | callback = pm_op(dev->class->pm, state); | |
35cd133c | 683 | goto Driver; |
1eede070 | 684 | } else if (dev->class->resume) { |
9cf519d1 RW |
685 | info = "legacy class "; |
686 | callback = dev->class->resume; | |
9659cc06 | 687 | goto End; |
1eede070 | 688 | } |
cd59abfc | 689 | } |
9659cc06 RW |
690 | |
691 | if (dev->bus) { | |
692 | if (dev->bus->pm) { | |
35cd133c | 693 | info = "bus "; |
9cf519d1 | 694 | callback = pm_op(dev->bus->pm, state); |
9659cc06 | 695 | } else if (dev->bus->resume) { |
35cd133c | 696 | info = "legacy bus "; |
9cf519d1 | 697 | callback = dev->bus->resume; |
35cd133c | 698 | goto End; |
9659cc06 RW |
699 | } |
700 | } | |
701 | ||
35cd133c RW |
702 | Driver: |
703 | if (!callback && dev->driver && dev->driver->pm) { | |
704 | info = "driver "; | |
705 | callback = pm_op(dev->driver->pm, state); | |
706 | } | |
707 | ||
1eede070 | 708 | End: |
9cf519d1 | 709 | error = dpm_run_callback(callback, dev, state, info); |
6d0e0e84 AS |
710 | dev->power.is_suspended = false; |
711 | ||
712 | Unlock: | |
8e9394ce | 713 | device_unlock(dev); |
70fea60d | 714 | dpm_watchdog_clear(&wd); |
dbf37414 RW |
715 | |
716 | Complete: | |
5af84b82 | 717 | complete_all(&dev->power.completion); |
7a8d37a3 | 718 | |
cd59abfc | 719 | TRACE_RESUME(error); |
1e2ef05b | 720 | |
cd59abfc AS |
721 | return error; |
722 | } | |
723 | ||
5af84b82 RW |
724 | static void async_resume(void *data, async_cookie_t cookie) |
725 | { | |
726 | struct device *dev = (struct device *)data; | |
727 | int error; | |
728 | ||
97df8c12 | 729 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
730 | if (error) |
731 | pm_dev_err(dev, pm_transition, " async", error); | |
732 | put_device(dev); | |
733 | } | |
734 | ||
97df8c12 | 735 | static bool is_async(struct device *dev) |
5af84b82 | 736 | { |
97df8c12 RW |
737 | return dev->power.async_suspend && pm_async_enabled |
738 | && !pm_trace_is_enabled(); | |
5af84b82 RW |
739 | } |
740 | ||
775b64d2 | 741 | /** |
20d652d7 RW |
742 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
743 | * @state: PM transition of the system being carried out. | |
775b64d2 | 744 | * |
20d652d7 RW |
745 | * Execute the appropriate "resume" callback for all devices whose status |
746 | * indicates that they are suspended. | |
1eede070 | 747 | */ |
91e7c75b | 748 | void dpm_resume(pm_message_t state) |
1eede070 | 749 | { |
97df8c12 | 750 | struct device *dev; |
ecf762b2 | 751 | ktime_t starttime = ktime_get(); |
1eede070 | 752 | |
91e7c75b RW |
753 | might_sleep(); |
754 | ||
1eede070 | 755 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 756 | pm_transition = state; |
098dff73 | 757 | async_error = 0; |
1eede070 | 758 | |
8a43a9ab | 759 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
16735d02 | 760 | reinit_completion(&dev->power.completion); |
97df8c12 RW |
761 | if (is_async(dev)) { |
762 | get_device(dev); | |
763 | async_schedule(async_resume, dev); | |
764 | } | |
765 | } | |
766 | ||
8a43a9ab RW |
767 | while (!list_empty(&dpm_suspended_list)) { |
768 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 769 | get_device(dev); |
5b219a51 | 770 | if (!is_async(dev)) { |
1eede070 RW |
771 | int error; |
772 | ||
1eede070 RW |
773 | mutex_unlock(&dpm_list_mtx); |
774 | ||
97df8c12 | 775 | error = device_resume(dev, state, false); |
2a77c46d SL |
776 | if (error) { |
777 | suspend_stats.failed_resume++; | |
778 | dpm_save_failed_step(SUSPEND_RESUME); | |
779 | dpm_save_failed_dev(dev_name(dev)); | |
1eede070 | 780 | pm_dev_err(dev, state, "", error); |
2a77c46d | 781 | } |
5b219a51 RW |
782 | |
783 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
784 | } |
785 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 786 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
787 | put_device(dev); |
788 | } | |
1eede070 | 789 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 790 | async_synchronize_full(); |
ecf762b2 | 791 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
792 | } |
793 | ||
794 | /** | |
20d652d7 RW |
795 | * device_complete - Complete a PM transition for given device. |
796 | * @dev: Device to handle. | |
797 | * @state: PM transition of the system being carried out. | |
1eede070 | 798 | */ |
d1616302 | 799 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 800 | { |
35cd133c RW |
801 | void (*callback)(struct device *) = NULL; |
802 | char *info = NULL; | |
803 | ||
dbf37414 RW |
804 | if (dev->power.syscore) |
805 | return; | |
806 | ||
8e9394ce | 807 | device_lock(dev); |
1eede070 | 808 | |
564b905a | 809 | if (dev->pm_domain) { |
35cd133c RW |
810 | info = "completing power domain "; |
811 | callback = dev->pm_domain->ops.complete; | |
4d27e9dc | 812 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
813 | info = "completing type "; |
814 | callback = dev->type->pm->complete; | |
9659cc06 | 815 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
816 | info = "completing class "; |
817 | callback = dev->class->pm->complete; | |
9659cc06 | 818 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
819 | info = "completing bus "; |
820 | callback = dev->bus->pm->complete; | |
821 | } | |
822 | ||
823 | if (!callback && dev->driver && dev->driver->pm) { | |
824 | info = "completing driver "; | |
825 | callback = dev->driver->pm->complete; | |
826 | } | |
827 | ||
828 | if (callback) { | |
829 | pm_dev_dbg(dev, state, info); | |
830 | callback(dev); | |
1eede070 RW |
831 | } |
832 | ||
8e9394ce | 833 | device_unlock(dev); |
88d26136 | 834 | |
af939339 | 835 | pm_runtime_put(dev); |
1eede070 RW |
836 | } |
837 | ||
838 | /** | |
20d652d7 RW |
839 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
840 | * @state: PM transition of the system being carried out. | |
775b64d2 | 841 | * |
20d652d7 RW |
842 | * Execute the ->complete() callbacks for all devices whose PM status is not |
843 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 844 | */ |
91e7c75b | 845 | void dpm_complete(pm_message_t state) |
cd59abfc | 846 | { |
1eede070 RW |
847 | struct list_head list; |
848 | ||
91e7c75b RW |
849 | might_sleep(); |
850 | ||
1eede070 | 851 | INIT_LIST_HEAD(&list); |
cd59abfc | 852 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
853 | while (!list_empty(&dpm_prepared_list)) { |
854 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 855 | |
1eede070 | 856 | get_device(dev); |
f76b168b | 857 | dev->power.is_prepared = false; |
5b219a51 RW |
858 | list_move(&dev->power.entry, &list); |
859 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 860 | |
5b219a51 | 861 | device_complete(dev, state); |
1eede070 | 862 | |
5b219a51 | 863 | mutex_lock(&dpm_list_mtx); |
1eede070 | 864 | put_device(dev); |
cd59abfc | 865 | } |
1eede070 | 866 | list_splice(&list, &dpm_list); |
cd59abfc AS |
867 | mutex_unlock(&dpm_list_mtx); |
868 | } | |
869 | ||
cd59abfc | 870 | /** |
20d652d7 RW |
871 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
872 | * @state: PM transition of the system being carried out. | |
cd59abfc | 873 | * |
20d652d7 RW |
874 | * Execute "resume" callbacks for all devices and complete the PM transition of |
875 | * the system. | |
cd59abfc | 876 | */ |
d1616302 | 877 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 878 | { |
1eede070 RW |
879 | dpm_resume(state); |
880 | dpm_complete(state); | |
cd59abfc | 881 | } |
d1616302 | 882 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
883 | |
884 | ||
885 | /*------------------------- Suspend routines -------------------------*/ | |
886 | ||
1eede070 | 887 | /** |
20d652d7 RW |
888 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
889 | * @sleep_state: PM message representing a sleep state. | |
890 | * | |
891 | * Return a PM message representing the resume event corresponding to given | |
892 | * sleep state. | |
1eede070 RW |
893 | */ |
894 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 895 | { |
1eede070 RW |
896 | switch (sleep_state.event) { |
897 | case PM_EVENT_SUSPEND: | |
898 | return PMSG_RESUME; | |
899 | case PM_EVENT_FREEZE: | |
900 | case PM_EVENT_QUIESCE: | |
901 | return PMSG_RECOVER; | |
902 | case PM_EVENT_HIBERNATE: | |
903 | return PMSG_RESTORE; | |
cd59abfc | 904 | } |
1eede070 | 905 | return PMSG_ON; |
cd59abfc AS |
906 | } |
907 | ||
908 | /** | |
20d652d7 RW |
909 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
910 | * @dev: Device to handle. | |
911 | * @state: PM transition of the system being carried out. | |
775b64d2 | 912 | * |
20d652d7 RW |
913 | * The driver of @dev will not receive interrupts while this function is being |
914 | * executed. | |
cd59abfc | 915 | */ |
d1616302 | 916 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 | 917 | { |
9cf519d1 RW |
918 | pm_callback_t callback = NULL; |
919 | char *info = NULL; | |
e7176a37 | 920 | |
dbf37414 RW |
921 | if (dev->power.syscore) |
922 | return 0; | |
923 | ||
564b905a | 924 | if (dev->pm_domain) { |
cf579dfb | 925 | info = "noirq power domain "; |
9cf519d1 | 926 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 927 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 928 | info = "noirq type "; |
9cf519d1 | 929 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 930 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 931 | info = "noirq class "; |
9cf519d1 | 932 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 933 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 934 | info = "noirq bus "; |
9cf519d1 | 935 | callback = pm_noirq_op(dev->bus->pm, state); |
7538e3db RW |
936 | } |
937 | ||
35cd133c | 938 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 939 | info = "noirq driver "; |
35cd133c RW |
940 | callback = pm_noirq_op(dev->driver->pm, state); |
941 | } | |
942 | ||
9cf519d1 | 943 | return dpm_run_callback(callback, dev, state, info); |
775b64d2 RW |
944 | } |
945 | ||
946 | /** | |
cf579dfb | 947 | * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices. |
20d652d7 | 948 | * @state: PM transition of the system being carried out. |
775b64d2 | 949 | * |
20d652d7 RW |
950 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
951 | * handlers for all non-sysdev devices. | |
775b64d2 | 952 | */ |
cf579dfb | 953 | static int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 954 | { |
ecf762b2 | 955 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
956 | int error = 0; |
957 | ||
8651f97b | 958 | cpuidle_pause(); |
2ed8d2b3 | 959 | suspend_device_irqs(); |
32bdfac5 | 960 | mutex_lock(&dpm_list_mtx); |
cf579dfb RW |
961 | while (!list_empty(&dpm_late_early_list)) { |
962 | struct device *dev = to_device(dpm_late_early_list.prev); | |
d08a5ace RW |
963 | |
964 | get_device(dev); | |
965 | mutex_unlock(&dpm_list_mtx); | |
966 | ||
d1616302 | 967 | error = device_suspend_noirq(dev, state); |
d08a5ace RW |
968 | |
969 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 970 | if (error) { |
cf579dfb | 971 | pm_dev_err(dev, state, " noirq", error); |
2a77c46d SL |
972 | suspend_stats.failed_suspend_noirq++; |
973 | dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); | |
974 | dpm_save_failed_dev(dev_name(dev)); | |
d08a5ace | 975 | put_device(dev); |
775b64d2 RW |
976 | break; |
977 | } | |
d08a5ace | 978 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 979 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 980 | put_device(dev); |
52d136cc RW |
981 | |
982 | if (pm_wakeup_pending()) { | |
983 | error = -EBUSY; | |
984 | break; | |
985 | } | |
775b64d2 | 986 | } |
32bdfac5 | 987 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 988 | if (error) |
d1616302 | 989 | dpm_resume_noirq(resume_event(state)); |
cf579dfb RW |
990 | else |
991 | dpm_show_time(starttime, state, "noirq"); | |
992 | return error; | |
993 | } | |
994 | ||
995 | /** | |
996 | * device_suspend_late - Execute a "late suspend" callback for given device. | |
997 | * @dev: Device to handle. | |
998 | * @state: PM transition of the system being carried out. | |
999 | * | |
1000 | * Runtime PM is disabled for @dev while this function is being executed. | |
1001 | */ | |
1002 | static int device_suspend_late(struct device *dev, pm_message_t state) | |
1003 | { | |
1004 | pm_callback_t callback = NULL; | |
1005 | char *info = NULL; | |
1006 | ||
9f6d8f6a RW |
1007 | __pm_runtime_disable(dev, false); |
1008 | ||
dbf37414 RW |
1009 | if (dev->power.syscore) |
1010 | return 0; | |
1011 | ||
cf579dfb RW |
1012 | if (dev->pm_domain) { |
1013 | info = "late power domain "; | |
1014 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
1015 | } else if (dev->type && dev->type->pm) { | |
1016 | info = "late type "; | |
1017 | callback = pm_late_early_op(dev->type->pm, state); | |
1018 | } else if (dev->class && dev->class->pm) { | |
1019 | info = "late class "; | |
1020 | callback = pm_late_early_op(dev->class->pm, state); | |
1021 | } else if (dev->bus && dev->bus->pm) { | |
1022 | info = "late bus "; | |
1023 | callback = pm_late_early_op(dev->bus->pm, state); | |
1024 | } | |
1025 | ||
1026 | if (!callback && dev->driver && dev->driver->pm) { | |
1027 | info = "late driver "; | |
1028 | callback = pm_late_early_op(dev->driver->pm, state); | |
1029 | } | |
1030 | ||
1031 | return dpm_run_callback(callback, dev, state, info); | |
1032 | } | |
1033 | ||
1034 | /** | |
1035 | * dpm_suspend_late - Execute "late suspend" callbacks for all devices. | |
1036 | * @state: PM transition of the system being carried out. | |
1037 | */ | |
1038 | static int dpm_suspend_late(pm_message_t state) | |
1039 | { | |
1040 | ktime_t starttime = ktime_get(); | |
1041 | int error = 0; | |
1042 | ||
1043 | mutex_lock(&dpm_list_mtx); | |
1044 | while (!list_empty(&dpm_suspended_list)) { | |
1045 | struct device *dev = to_device(dpm_suspended_list.prev); | |
1046 | ||
1047 | get_device(dev); | |
1048 | mutex_unlock(&dpm_list_mtx); | |
1049 | ||
1050 | error = device_suspend_late(dev, state); | |
1051 | ||
1052 | mutex_lock(&dpm_list_mtx); | |
1053 | if (error) { | |
1054 | pm_dev_err(dev, state, " late", error); | |
1055 | suspend_stats.failed_suspend_late++; | |
1056 | dpm_save_failed_step(SUSPEND_SUSPEND_LATE); | |
1057 | dpm_save_failed_dev(dev_name(dev)); | |
1058 | put_device(dev); | |
1059 | break; | |
1060 | } | |
1061 | if (!list_empty(&dev->power.entry)) | |
1062 | list_move(&dev->power.entry, &dpm_late_early_list); | |
1063 | put_device(dev); | |
52d136cc RW |
1064 | |
1065 | if (pm_wakeup_pending()) { | |
1066 | error = -EBUSY; | |
1067 | break; | |
1068 | } | |
cf579dfb RW |
1069 | } |
1070 | mutex_unlock(&dpm_list_mtx); | |
1071 | if (error) | |
1072 | dpm_resume_early(resume_event(state)); | |
ecf762b2 RW |
1073 | else |
1074 | dpm_show_time(starttime, state, "late"); | |
cf579dfb | 1075 | |
775b64d2 RW |
1076 | return error; |
1077 | } | |
cf579dfb RW |
1078 | |
1079 | /** | |
1080 | * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks. | |
1081 | * @state: PM transition of the system being carried out. | |
1082 | */ | |
1083 | int dpm_suspend_end(pm_message_t state) | |
1084 | { | |
1085 | int error = dpm_suspend_late(state); | |
064b021f CC |
1086 | if (error) |
1087 | return error; | |
1088 | ||
1089 | error = dpm_suspend_noirq(state); | |
1090 | if (error) { | |
997a0311 | 1091 | dpm_resume_early(resume_event(state)); |
064b021f CC |
1092 | return error; |
1093 | } | |
cf579dfb | 1094 | |
064b021f | 1095 | return 0; |
cf579dfb RW |
1096 | } |
1097 | EXPORT_SYMBOL_GPL(dpm_suspend_end); | |
775b64d2 | 1098 | |
875ab0b7 RW |
1099 | /** |
1100 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
1101 | * @dev: Device to suspend. |
1102 | * @state: PM transition of the system being carried out. | |
1103 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
1104 | */ |
1105 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
53644677 SK |
1106 | int (*cb)(struct device *dev, pm_message_t state), |
1107 | char *info) | |
875ab0b7 RW |
1108 | { |
1109 | int error; | |
1110 | ktime_t calltime; | |
1111 | ||
1112 | calltime = initcall_debug_start(dev); | |
1113 | ||
1114 | error = cb(dev, state); | |
1115 | suspend_report_result(cb, error); | |
1116 | ||
53644677 | 1117 | initcall_debug_report(dev, calltime, error, state, info); |
875ab0b7 RW |
1118 | |
1119 | return error; | |
1120 | } | |
1121 | ||
775b64d2 | 1122 | /** |
20d652d7 RW |
1123 | * device_suspend - Execute "suspend" callbacks for given device. |
1124 | * @dev: Device to handle. | |
1125 | * @state: PM transition of the system being carried out. | |
5af84b82 | 1126 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1127 | */ |
5af84b82 | 1128 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 1129 | { |
9cf519d1 RW |
1130 | pm_callback_t callback = NULL; |
1131 | char *info = NULL; | |
cd59abfc | 1132 | int error = 0; |
70fea60d | 1133 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
cd59abfc | 1134 | |
5af84b82 | 1135 | dpm_wait_for_children(dev, async); |
7a8d37a3 | 1136 | |
5af84b82 | 1137 | if (async_error) |
1f758b23 | 1138 | goto Complete; |
1e2ef05b | 1139 | |
88d26136 AS |
1140 | /* |
1141 | * If a device configured to wake up the system from sleep states | |
1142 | * has been suspended at run time and there's a resume request pending | |
1143 | * for it, this is equivalent to the device signaling wakeup, so the | |
1144 | * system suspend operation should be aborted. | |
1145 | */ | |
1e2ef05b RW |
1146 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1147 | pm_wakeup_event(dev, 0); | |
5af84b82 | 1148 | |
d83f905e RW |
1149 | if (pm_wakeup_pending()) { |
1150 | async_error = -EBUSY; | |
1f758b23 | 1151 | goto Complete; |
d83f905e RW |
1152 | } |
1153 | ||
dbf37414 RW |
1154 | if (dev->power.syscore) |
1155 | goto Complete; | |
1156 | ||
70fea60d | 1157 | dpm_watchdog_set(&wd, dev); |
1e2ef05b RW |
1158 | device_lock(dev); |
1159 | ||
564b905a | 1160 | if (dev->pm_domain) { |
9cf519d1 RW |
1161 | info = "power domain "; |
1162 | callback = pm_op(&dev->pm_domain->ops, state); | |
1163 | goto Run; | |
4d27e9dc RW |
1164 | } |
1165 | ||
9659cc06 | 1166 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
1167 | info = "type "; |
1168 | callback = pm_op(dev->type->pm, state); | |
1169 | goto Run; | |
9659cc06 RW |
1170 | } |
1171 | ||
1eede070 RW |
1172 | if (dev->class) { |
1173 | if (dev->class->pm) { | |
9cf519d1 RW |
1174 | info = "class "; |
1175 | callback = pm_op(dev->class->pm, state); | |
1176 | goto Run; | |
1eede070 RW |
1177 | } else if (dev->class->suspend) { |
1178 | pm_dev_dbg(dev, state, "legacy class "); | |
53644677 SK |
1179 | error = legacy_suspend(dev, state, dev->class->suspend, |
1180 | "legacy class "); | |
4d27e9dc | 1181 | goto End; |
1eede070 | 1182 | } |
cd59abfc AS |
1183 | } |
1184 | ||
1eede070 RW |
1185 | if (dev->bus) { |
1186 | if (dev->bus->pm) { | |
35cd133c | 1187 | info = "bus "; |
9cf519d1 | 1188 | callback = pm_op(dev->bus->pm, state); |
1eede070 | 1189 | } else if (dev->bus->suspend) { |
35cd133c | 1190 | pm_dev_dbg(dev, state, "legacy bus "); |
53644677 SK |
1191 | error = legacy_suspend(dev, state, dev->bus->suspend, |
1192 | "legacy bus "); | |
9cf519d1 | 1193 | goto End; |
1eede070 | 1194 | } |
7538e3db RW |
1195 | } |
1196 | ||
9cf519d1 | 1197 | Run: |
35cd133c RW |
1198 | if (!callback && dev->driver && dev->driver->pm) { |
1199 | info = "driver "; | |
1200 | callback = pm_op(dev->driver->pm, state); | |
1201 | } | |
1202 | ||
9cf519d1 RW |
1203 | error = dpm_run_callback(callback, dev, state, info); |
1204 | ||
1eede070 | 1205 | End: |
4ca46ff3 RW |
1206 | if (!error) { |
1207 | dev->power.is_suspended = true; | |
8b258cc8 RW |
1208 | if (dev->power.wakeup_path |
1209 | && dev->parent && !dev->parent->power.ignore_children) | |
4ca46ff3 RW |
1210 | dev->parent->power.wakeup_path = true; |
1211 | } | |
6d0e0e84 | 1212 | |
8e9394ce | 1213 | device_unlock(dev); |
70fea60d | 1214 | dpm_watchdog_clear(&wd); |
1f758b23 MSB |
1215 | |
1216 | Complete: | |
5af84b82 | 1217 | complete_all(&dev->power.completion); |
88d26136 | 1218 | if (error) |
098dff73 RW |
1219 | async_error = error; |
1220 | ||
cd59abfc AS |
1221 | return error; |
1222 | } | |
1223 | ||
5af84b82 RW |
1224 | static void async_suspend(void *data, async_cookie_t cookie) |
1225 | { | |
1226 | struct device *dev = (struct device *)data; | |
1227 | int error; | |
1228 | ||
1229 | error = __device_suspend(dev, pm_transition, true); | |
2a77c46d SL |
1230 | if (error) { |
1231 | dpm_save_failed_dev(dev_name(dev)); | |
5af84b82 | 1232 | pm_dev_err(dev, pm_transition, " async", error); |
2a77c46d | 1233 | } |
5af84b82 RW |
1234 | |
1235 | put_device(dev); | |
1236 | } | |
1237 | ||
1238 | static int device_suspend(struct device *dev) | |
1239 | { | |
16735d02 | 1240 | reinit_completion(&dev->power.completion); |
5af84b82 | 1241 | |
0e06b4a8 | 1242 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
1243 | get_device(dev); |
1244 | async_schedule(async_suspend, dev); | |
1245 | return 0; | |
1246 | } | |
1247 | ||
1248 | return __device_suspend(dev, pm_transition, false); | |
1249 | } | |
1250 | ||
cd59abfc | 1251 | /** |
20d652d7 RW |
1252 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
1253 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1254 | */ |
91e7c75b | 1255 | int dpm_suspend(pm_message_t state) |
cd59abfc | 1256 | { |
ecf762b2 | 1257 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
1258 | int error = 0; |
1259 | ||
91e7c75b RW |
1260 | might_sleep(); |
1261 | ||
cd59abfc | 1262 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
1263 | pm_transition = state; |
1264 | async_error = 0; | |
8a43a9ab RW |
1265 | while (!list_empty(&dpm_prepared_list)) { |
1266 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 1267 | |
1eede070 | 1268 | get_device(dev); |
cd59abfc | 1269 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 1270 | |
5af84b82 | 1271 | error = device_suspend(dev); |
1eede070 | 1272 | |
1b3cbec1 | 1273 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 1274 | if (error) { |
1eede070 | 1275 | pm_dev_err(dev, state, "", error); |
2a77c46d | 1276 | dpm_save_failed_dev(dev_name(dev)); |
1eede070 | 1277 | put_device(dev); |
775b64d2 RW |
1278 | break; |
1279 | } | |
7a8d37a3 | 1280 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1281 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 1282 | put_device(dev); |
5af84b82 RW |
1283 | if (async_error) |
1284 | break; | |
cd59abfc AS |
1285 | } |
1286 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
1287 | async_synchronize_full(); |
1288 | if (!error) | |
1289 | error = async_error; | |
2a77c46d SL |
1290 | if (error) { |
1291 | suspend_stats.failed_suspend++; | |
1292 | dpm_save_failed_step(SUSPEND_SUSPEND); | |
1293 | } else | |
ecf762b2 | 1294 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
1295 | return error; |
1296 | } | |
1297 | ||
1298 | /** | |
20d652d7 RW |
1299 | * device_prepare - Prepare a device for system power transition. |
1300 | * @dev: Device to handle. | |
1301 | * @state: PM transition of the system being carried out. | |
1302 | * | |
1303 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
1304 | * device may be registered after this function has returned. | |
1eede070 | 1305 | */ |
d1616302 | 1306 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 | 1307 | { |
35cd133c RW |
1308 | int (*callback)(struct device *) = NULL; |
1309 | char *info = NULL; | |
1eede070 RW |
1310 | int error = 0; |
1311 | ||
dbf37414 RW |
1312 | if (dev->power.syscore) |
1313 | return 0; | |
1314 | ||
88d26136 AS |
1315 | /* |
1316 | * If a device's parent goes into runtime suspend at the wrong time, | |
1317 | * it won't be possible to resume the device. To prevent this we | |
1318 | * block runtime suspend here, during the prepare phase, and allow | |
1319 | * it again during the complete phase. | |
1320 | */ | |
1321 | pm_runtime_get_noresume(dev); | |
1322 | ||
8e9394ce | 1323 | device_lock(dev); |
1eede070 | 1324 | |
4ca46ff3 RW |
1325 | dev->power.wakeup_path = device_may_wakeup(dev); |
1326 | ||
564b905a | 1327 | if (dev->pm_domain) { |
35cd133c RW |
1328 | info = "preparing power domain "; |
1329 | callback = dev->pm_domain->ops.prepare; | |
4d27e9dc | 1330 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
1331 | info = "preparing type "; |
1332 | callback = dev->type->pm->prepare; | |
9659cc06 | 1333 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
1334 | info = "preparing class "; |
1335 | callback = dev->class->pm->prepare; | |
9659cc06 | 1336 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
1337 | info = "preparing bus "; |
1338 | callback = dev->bus->pm->prepare; | |
1339 | } | |
1340 | ||
1341 | if (!callback && dev->driver && dev->driver->pm) { | |
1342 | info = "preparing driver "; | |
1343 | callback = dev->driver->pm->prepare; | |
1344 | } | |
1345 | ||
1346 | if (callback) { | |
1347 | error = callback(dev); | |
1348 | suspend_report_result(callback, error); | |
1eede070 | 1349 | } |
7538e3db | 1350 | |
8e9394ce | 1351 | device_unlock(dev); |
1eede070 | 1352 | |
aa1b9f13 UH |
1353 | if (error) |
1354 | pm_runtime_put(dev); | |
1355 | ||
1eede070 RW |
1356 | return error; |
1357 | } | |
cd59abfc | 1358 | |
1eede070 | 1359 | /** |
20d652d7 RW |
1360 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1361 | * @state: PM transition of the system being carried out. | |
1eede070 | 1362 | * |
20d652d7 | 1363 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 | 1364 | */ |
91e7c75b | 1365 | int dpm_prepare(pm_message_t state) |
1eede070 | 1366 | { |
1eede070 RW |
1367 | int error = 0; |
1368 | ||
91e7c75b RW |
1369 | might_sleep(); |
1370 | ||
1eede070 | 1371 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
1372 | while (!list_empty(&dpm_list)) { |
1373 | struct device *dev = to_device(dpm_list.next); | |
1374 | ||
1375 | get_device(dev); | |
1eede070 RW |
1376 | mutex_unlock(&dpm_list_mtx); |
1377 | ||
1e2ef05b | 1378 | error = device_prepare(dev, state); |
1eede070 RW |
1379 | |
1380 | mutex_lock(&dpm_list_mtx); | |
1381 | if (error) { | |
1eede070 RW |
1382 | if (error == -EAGAIN) { |
1383 | put_device(dev); | |
886a7a33 | 1384 | error = 0; |
1eede070 RW |
1385 | continue; |
1386 | } | |
1e75227e RW |
1387 | printk(KERN_INFO "PM: Device %s not prepared " |
1388 | "for power transition: code %d\n", | |
5c1a07ab | 1389 | dev_name(dev), error); |
1eede070 RW |
1390 | put_device(dev); |
1391 | break; | |
1392 | } | |
f76b168b | 1393 | dev->power.is_prepared = true; |
1eede070 | 1394 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1395 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1396 | put_device(dev); |
1397 | } | |
1eede070 | 1398 | mutex_unlock(&dpm_list_mtx); |
cd59abfc AS |
1399 | return error; |
1400 | } | |
1401 | ||
775b64d2 | 1402 | /** |
20d652d7 RW |
1403 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1404 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1405 | * |
20d652d7 RW |
1406 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1407 | * callbacks for them. | |
775b64d2 | 1408 | */ |
d1616302 | 1409 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1410 | { |
1411 | int error; | |
cd59abfc | 1412 | |
1eede070 | 1413 | error = dpm_prepare(state); |
2a77c46d SL |
1414 | if (error) { |
1415 | suspend_stats.failed_prepare++; | |
1416 | dpm_save_failed_step(SUSPEND_PREPARE); | |
1417 | } else | |
1eede070 | 1418 | error = dpm_suspend(state); |
cd59abfc | 1419 | return error; |
cd59abfc | 1420 | } |
d1616302 | 1421 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1422 | |
1423 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1424 | { | |
c80cfb04 BH |
1425 | if (ret) |
1426 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1427 | } |
1428 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1429 | |
1430 | /** | |
1431 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1432 | * @dev: Device to wait for. | |
1433 | * @subordinate: Device that needs to wait for @dev. | |
1434 | */ | |
098dff73 | 1435 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1436 | { |
1437 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1438 | return async_error; |
f8824cee RW |
1439 | } |
1440 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); | |
dfe3212e ML |
1441 | |
1442 | /** | |
1443 | * dpm_for_each_dev - device iterator. | |
1444 | * @data: data for the callback. | |
1445 | * @fn: function to be called for each device. | |
1446 | * | |
1447 | * Iterate over devices in dpm_list, and call @fn for each device, | |
1448 | * passing it @data. | |
1449 | */ | |
1450 | void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) | |
1451 | { | |
1452 | struct device *dev; | |
1453 | ||
1454 | if (!fn) | |
1455 | return; | |
1456 | ||
1457 | device_pm_lock(); | |
1458 | list_for_each_entry(dev, &dpm_list, power.entry) | |
1459 | fn(dev, data); | |
1460 | device_pm_unlock(); | |
1461 | } | |
1462 | EXPORT_SYMBOL_GPL(dpm_for_each_dev); |