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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> |
431d452a | 26 | #include <linux/pm-trace.h> |
4990d4fe | 27 | #include <linux/pm_wakeirq.h> |
2ed8d2b3 | 28 | #include <linux/interrupt.h> |
f2511774 | 29 | #include <linux/sched.h> |
5af84b82 | 30 | #include <linux/async.h> |
1e75227e | 31 | #include <linux/suspend.h> |
53644677 | 32 | #include <trace/events/power.h> |
2f0aea93 | 33 | #include <linux/cpufreq.h> |
8651f97b | 34 | #include <linux/cpuidle.h> |
70fea60d BG |
35 | #include <linux/timer.h> |
36 | ||
cd59abfc | 37 | #include "../base.h" |
1da177e4 LT |
38 | #include "power.h" |
39 | ||
9cf519d1 RW |
40 | typedef int (*pm_callback_t)(struct device *); |
41 | ||
775b64d2 | 42 | /* |
1eede070 | 43 | * The entries in the dpm_list list are in a depth first order, simply |
775b64d2 RW |
44 | * because children are guaranteed to be discovered after parents, and |
45 | * are inserted at the back of the list on discovery. | |
46 | * | |
8e9394ce GKH |
47 | * Since device_pm_add() may be called with a device lock held, |
48 | * we must never try to acquire a device lock while holding | |
775b64d2 RW |
49 | * dpm_list_mutex. |
50 | */ | |
51 | ||
1eede070 | 52 | LIST_HEAD(dpm_list); |
7664e969 SK |
53 | static LIST_HEAD(dpm_prepared_list); |
54 | static LIST_HEAD(dpm_suspended_list); | |
55 | static LIST_HEAD(dpm_late_early_list); | |
56 | static LIST_HEAD(dpm_noirq_list); | |
1da177e4 | 57 | |
2a77c46d | 58 | struct suspend_stats suspend_stats; |
cd59abfc | 59 | static DEFINE_MUTEX(dpm_list_mtx); |
5af84b82 | 60 | static pm_message_t pm_transition; |
1da177e4 | 61 | |
098dff73 RW |
62 | static int async_error; |
63 | ||
53644677 SK |
64 | static char *pm_verb(int event) |
65 | { | |
66 | switch (event) { | |
67 | case PM_EVENT_SUSPEND: | |
68 | return "suspend"; | |
69 | case PM_EVENT_RESUME: | |
70 | return "resume"; | |
71 | case PM_EVENT_FREEZE: | |
72 | return "freeze"; | |
73 | case PM_EVENT_QUIESCE: | |
74 | return "quiesce"; | |
75 | case PM_EVENT_HIBERNATE: | |
76 | return "hibernate"; | |
77 | case PM_EVENT_THAW: | |
78 | return "thaw"; | |
79 | case PM_EVENT_RESTORE: | |
80 | return "restore"; | |
81 | case PM_EVENT_RECOVER: | |
82 | return "recover"; | |
83 | default: | |
84 | return "(unknown PM event)"; | |
85 | } | |
86 | } | |
87 | ||
5e928f77 | 88 | /** |
e91c11b1 | 89 | * device_pm_sleep_init - Initialize system suspend-related device fields. |
5e928f77 RW |
90 | * @dev: Device object being initialized. |
91 | */ | |
e91c11b1 | 92 | void device_pm_sleep_init(struct device *dev) |
5e928f77 | 93 | { |
f76b168b | 94 | dev->power.is_prepared = false; |
6d0e0e84 | 95 | dev->power.is_suspended = false; |
3d2699bc LC |
96 | dev->power.is_noirq_suspended = false; |
97 | dev->power.is_late_suspended = false; | |
5af84b82 | 98 | init_completion(&dev->power.completion); |
152e1d59 | 99 | complete_all(&dev->power.completion); |
074037ec | 100 | dev->power.wakeup = NULL; |
22110faf | 101 | INIT_LIST_HEAD(&dev->power.entry); |
5e928f77 RW |
102 | } |
103 | ||
1eede070 | 104 | /** |
20d652d7 | 105 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
106 | */ |
107 | void device_pm_lock(void) | |
108 | { | |
109 | mutex_lock(&dpm_list_mtx); | |
110 | } | |
111 | ||
112 | /** | |
20d652d7 | 113 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
114 | */ |
115 | void device_pm_unlock(void) | |
116 | { | |
117 | mutex_unlock(&dpm_list_mtx); | |
118 | } | |
075c1771 | 119 | |
775b64d2 | 120 | /** |
20d652d7 RW |
121 | * device_pm_add - Add a device to the PM core's list of active devices. |
122 | * @dev: Device to add to the list. | |
775b64d2 | 123 | */ |
3b98aeaf | 124 | void device_pm_add(struct device *dev) |
1da177e4 | 125 | { |
1da177e4 | 126 | pr_debug("PM: Adding info for %s:%s\n", |
5c1a07ab | 127 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
11048dcf | 128 | mutex_lock(&dpm_list_mtx); |
f76b168b | 129 | if (dev->parent && dev->parent->power.is_prepared) |
b64959e6 RW |
130 | dev_warn(dev, "parent %s should not be sleeping\n", |
131 | dev_name(dev->parent)); | |
3b98aeaf | 132 | list_add_tail(&dev->power.entry, &dpm_list); |
1a9a9152 | 133 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
134 | } |
135 | ||
775b64d2 | 136 | /** |
20d652d7 RW |
137 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
138 | * @dev: Device to be removed from the list. | |
775b64d2 | 139 | */ |
9cddad77 | 140 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
141 | { |
142 | pr_debug("PM: Removing info for %s:%s\n", | |
5c1a07ab | 143 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
5af84b82 | 144 | complete_all(&dev->power.completion); |
11048dcf | 145 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 146 | list_del_init(&dev->power.entry); |
11048dcf | 147 | mutex_unlock(&dpm_list_mtx); |
074037ec | 148 | device_wakeup_disable(dev); |
5e928f77 | 149 | pm_runtime_remove(dev); |
775b64d2 RW |
150 | } |
151 | ||
ffa6a705 | 152 | /** |
20d652d7 RW |
153 | * device_pm_move_before - Move device in the PM core's list of active devices. |
154 | * @deva: Device to move in dpm_list. | |
155 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
156 | */ |
157 | void device_pm_move_before(struct device *deva, struct device *devb) | |
158 | { | |
159 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
5c1a07ab RW |
160 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
161 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
162 | /* Delete deva from dpm_list and reinsert before devb. */ |
163 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
164 | } | |
165 | ||
166 | /** | |
20d652d7 RW |
167 | * device_pm_move_after - Move device in the PM core's list of active devices. |
168 | * @deva: Device to move in dpm_list. | |
169 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
170 | */ |
171 | void device_pm_move_after(struct device *deva, struct device *devb) | |
172 | { | |
173 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
5c1a07ab RW |
174 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
175 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
176 | /* Delete deva from dpm_list and reinsert after devb. */ |
177 | list_move(&deva->power.entry, &devb->power.entry); | |
178 | } | |
179 | ||
180 | /** | |
20d652d7 RW |
181 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
182 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
183 | */ |
184 | void device_pm_move_last(struct device *dev) | |
185 | { | |
186 | pr_debug("PM: Moving %s:%s to end of list\n", | |
5c1a07ab | 187 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
ffa6a705 CH |
188 | list_move_tail(&dev->power.entry, &dpm_list); |
189 | } | |
190 | ||
875ab0b7 RW |
191 | static ktime_t initcall_debug_start(struct device *dev) |
192 | { | |
193 | ktime_t calltime = ktime_set(0, 0); | |
194 | ||
b2df1d4f | 195 | if (pm_print_times_enabled) { |
0c6aebe3 RW |
196 | pr_info("calling %s+ @ %i, parent: %s\n", |
197 | dev_name(dev), task_pid_nr(current), | |
198 | dev->parent ? dev_name(dev->parent) : "none"); | |
875ab0b7 RW |
199 | calltime = ktime_get(); |
200 | } | |
201 | ||
202 | return calltime; | |
203 | } | |
204 | ||
205 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
53644677 | 206 | int error, pm_message_t state, char *info) |
875ab0b7 | 207 | { |
53644677 SK |
208 | ktime_t rettime; |
209 | s64 nsecs; | |
210 | ||
211 | rettime = ktime_get(); | |
212 | nsecs = (s64) ktime_to_ns(ktime_sub(rettime, calltime)); | |
875ab0b7 | 213 | |
b2df1d4f | 214 | if (pm_print_times_enabled) { |
875ab0b7 | 215 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), |
53644677 | 216 | error, (unsigned long long)nsecs >> 10); |
875ab0b7 RW |
217 | } |
218 | } | |
219 | ||
5af84b82 RW |
220 | /** |
221 | * dpm_wait - Wait for a PM operation to complete. | |
222 | * @dev: Device to wait for. | |
223 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
224 | */ | |
225 | static void dpm_wait(struct device *dev, bool async) | |
226 | { | |
227 | if (!dev) | |
228 | return; | |
229 | ||
0e06b4a8 | 230 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
231 | wait_for_completion(&dev->power.completion); |
232 | } | |
233 | ||
234 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
235 | { | |
236 | dpm_wait(dev, *((bool *)async_ptr)); | |
237 | return 0; | |
238 | } | |
239 | ||
240 | static void dpm_wait_for_children(struct device *dev, bool async) | |
241 | { | |
242 | device_for_each_child(dev, &async, dpm_wait_fn); | |
243 | } | |
244 | ||
1eede070 | 245 | /** |
9cf519d1 | 246 | * pm_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
247 | * @ops: PM operations to choose from. |
248 | * @state: PM transition of the system being carried out. | |
1eede070 | 249 | */ |
9cf519d1 | 250 | static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 251 | { |
1eede070 RW |
252 | switch (state.event) { |
253 | #ifdef CONFIG_SUSPEND | |
254 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 255 | return ops->suspend; |
1eede070 | 256 | case PM_EVENT_RESUME: |
9cf519d1 | 257 | return ops->resume; |
1eede070 | 258 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 259 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
260 | case PM_EVENT_FREEZE: |
261 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 262 | return ops->freeze; |
1eede070 | 263 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 264 | return ops->poweroff; |
1eede070 RW |
265 | case PM_EVENT_THAW: |
266 | case PM_EVENT_RECOVER: | |
9cf519d1 | 267 | return ops->thaw; |
1eede070 RW |
268 | break; |
269 | case PM_EVENT_RESTORE: | |
9cf519d1 | 270 | return ops->restore; |
1f112cee | 271 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 272 | } |
f2511774 | 273 | |
9cf519d1 | 274 | return NULL; |
1eede070 RW |
275 | } |
276 | ||
cf579dfb RW |
277 | /** |
278 | * pm_late_early_op - Return the PM operation appropriate for given PM event. | |
279 | * @ops: PM operations to choose from. | |
280 | * @state: PM transition of the system being carried out. | |
281 | * | |
282 | * Runtime PM is disabled for @dev while this function is being executed. | |
283 | */ | |
284 | static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops, | |
285 | pm_message_t state) | |
286 | { | |
287 | switch (state.event) { | |
288 | #ifdef CONFIG_SUSPEND | |
289 | case PM_EVENT_SUSPEND: | |
290 | return ops->suspend_late; | |
291 | case PM_EVENT_RESUME: | |
292 | return ops->resume_early; | |
293 | #endif /* CONFIG_SUSPEND */ | |
294 | #ifdef CONFIG_HIBERNATE_CALLBACKS | |
295 | case PM_EVENT_FREEZE: | |
296 | case PM_EVENT_QUIESCE: | |
297 | return ops->freeze_late; | |
298 | case PM_EVENT_HIBERNATE: | |
299 | return ops->poweroff_late; | |
300 | case PM_EVENT_THAW: | |
301 | case PM_EVENT_RECOVER: | |
302 | return ops->thaw_early; | |
303 | case PM_EVENT_RESTORE: | |
304 | return ops->restore_early; | |
305 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ | |
306 | } | |
307 | ||
308 | return NULL; | |
309 | } | |
310 | ||
1eede070 | 311 | /** |
9cf519d1 | 312 | * pm_noirq_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
313 | * @ops: PM operations to choose from. |
314 | * @state: PM transition of the system being carried out. | |
1eede070 | 315 | * |
20d652d7 RW |
316 | * The driver of @dev will not receive interrupts while this function is being |
317 | * executed. | |
1eede070 | 318 | */ |
9cf519d1 | 319 | static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 320 | { |
1eede070 RW |
321 | switch (state.event) { |
322 | #ifdef CONFIG_SUSPEND | |
323 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 324 | return ops->suspend_noirq; |
1eede070 | 325 | case PM_EVENT_RESUME: |
9cf519d1 | 326 | return ops->resume_noirq; |
1eede070 | 327 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 328 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
329 | case PM_EVENT_FREEZE: |
330 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 331 | return ops->freeze_noirq; |
1eede070 | 332 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 333 | return ops->poweroff_noirq; |
1eede070 RW |
334 | case PM_EVENT_THAW: |
335 | case PM_EVENT_RECOVER: | |
9cf519d1 | 336 | return ops->thaw_noirq; |
1eede070 | 337 | case PM_EVENT_RESTORE: |
9cf519d1 | 338 | return ops->restore_noirq; |
1f112cee | 339 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 340 | } |
f2511774 | 341 | |
9cf519d1 | 342 | return NULL; |
1eede070 RW |
343 | } |
344 | ||
1eede070 RW |
345 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) |
346 | { | |
347 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
348 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
349 | ", may wakeup" : ""); | |
350 | } | |
351 | ||
352 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
353 | int error) | |
354 | { | |
355 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
5c1a07ab | 356 | dev_name(dev), pm_verb(state.event), info, error); |
1eede070 RW |
357 | } |
358 | ||
ecf762b2 RW |
359 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
360 | { | |
361 | ktime_t calltime; | |
0702d9ee | 362 | u64 usecs64; |
ecf762b2 RW |
363 | int usecs; |
364 | ||
365 | calltime = ktime_get(); | |
366 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
367 | do_div(usecs64, NSEC_PER_USEC); | |
368 | usecs = usecs64; | |
369 | if (usecs == 0) | |
370 | usecs = 1; | |
371 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
372 | info ?: "", info ? " " : "", pm_verb(state.event), | |
373 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
374 | } | |
375 | ||
9cf519d1 RW |
376 | static int dpm_run_callback(pm_callback_t cb, struct device *dev, |
377 | pm_message_t state, char *info) | |
378 | { | |
379 | ktime_t calltime; | |
380 | int error; | |
381 | ||
382 | if (!cb) | |
383 | return 0; | |
384 | ||
385 | calltime = initcall_debug_start(dev); | |
386 | ||
387 | pm_dev_dbg(dev, state, info); | |
e8bca479 | 388 | trace_device_pm_callback_start(dev, info, state.event); |
9cf519d1 | 389 | error = cb(dev); |
e8bca479 | 390 | trace_device_pm_callback_end(dev, error); |
9cf519d1 RW |
391 | suspend_report_result(cb, error); |
392 | ||
53644677 | 393 | initcall_debug_report(dev, calltime, error, state, info); |
9cf519d1 RW |
394 | |
395 | return error; | |
396 | } | |
397 | ||
70fea60d BG |
398 | #ifdef CONFIG_DPM_WATCHDOG |
399 | struct dpm_watchdog { | |
400 | struct device *dev; | |
401 | struct task_struct *tsk; | |
402 | struct timer_list timer; | |
403 | }; | |
404 | ||
405 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \ | |
406 | struct dpm_watchdog wd | |
407 | ||
408 | /** | |
409 | * dpm_watchdog_handler - Driver suspend / resume watchdog handler. | |
410 | * @data: Watchdog object address. | |
411 | * | |
412 | * Called when a driver has timed out suspending or resuming. | |
413 | * There's not much we can do here to recover so panic() to | |
414 | * capture a crash-dump in pstore. | |
415 | */ | |
416 | static void dpm_watchdog_handler(unsigned long data) | |
417 | { | |
418 | struct dpm_watchdog *wd = (void *)data; | |
419 | ||
420 | dev_emerg(wd->dev, "**** DPM device timeout ****\n"); | |
421 | show_stack(wd->tsk, NULL); | |
422 | panic("%s %s: unrecoverable failure\n", | |
423 | dev_driver_string(wd->dev), dev_name(wd->dev)); | |
424 | } | |
425 | ||
426 | /** | |
427 | * dpm_watchdog_set - Enable pm watchdog for given device. | |
428 | * @wd: Watchdog. Must be allocated on the stack. | |
429 | * @dev: Device to handle. | |
430 | */ | |
431 | static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev) | |
432 | { | |
433 | struct timer_list *timer = &wd->timer; | |
434 | ||
435 | wd->dev = dev; | |
436 | wd->tsk = current; | |
437 | ||
438 | init_timer_on_stack(timer); | |
439 | /* use same timeout value for both suspend and resume */ | |
440 | timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT; | |
441 | timer->function = dpm_watchdog_handler; | |
442 | timer->data = (unsigned long)wd; | |
443 | add_timer(timer); | |
444 | } | |
445 | ||
446 | /** | |
447 | * dpm_watchdog_clear - Disable suspend/resume watchdog. | |
448 | * @wd: Watchdog to disable. | |
449 | */ | |
450 | static void dpm_watchdog_clear(struct dpm_watchdog *wd) | |
451 | { | |
452 | struct timer_list *timer = &wd->timer; | |
453 | ||
454 | del_timer_sync(timer); | |
455 | destroy_timer_on_stack(timer); | |
456 | } | |
457 | #else | |
458 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) | |
459 | #define dpm_watchdog_set(x, y) | |
460 | #define dpm_watchdog_clear(x) | |
461 | #endif | |
462 | ||
cd59abfc AS |
463 | /*------------------------- Resume routines -------------------------*/ |
464 | ||
465 | /** | |
20d652d7 RW |
466 | * device_resume_noirq - Execute an "early resume" callback for given device. |
467 | * @dev: Device to handle. | |
468 | * @state: PM transition of the system being carried out. | |
58c256a3 | 469 | * @async: If true, the device is being resumed asynchronously. |
cd59abfc | 470 | * |
20d652d7 RW |
471 | * The driver of @dev will not receive interrupts while this function is being |
472 | * executed. | |
cd59abfc | 473 | */ |
76569faa | 474 | static int device_resume_noirq(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 475 | { |
9cf519d1 RW |
476 | pm_callback_t callback = NULL; |
477 | char *info = NULL; | |
cd59abfc AS |
478 | int error = 0; |
479 | ||
480 | TRACE_DEVICE(dev); | |
481 | TRACE_RESUME(0); | |
482 | ||
aae4518b | 483 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
484 | goto Out; |
485 | ||
3d2699bc LC |
486 | if (!dev->power.is_noirq_suspended) |
487 | goto Out; | |
488 | ||
76569faa LC |
489 | dpm_wait(dev->parent, async); |
490 | ||
564b905a | 491 | if (dev->pm_domain) { |
cf579dfb | 492 | info = "noirq power domain "; |
9cf519d1 | 493 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 494 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 495 | info = "noirq type "; |
9cf519d1 | 496 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 497 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 498 | info = "noirq class "; |
9cf519d1 | 499 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 500 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 501 | info = "noirq bus "; |
9cf519d1 | 502 | callback = pm_noirq_op(dev->bus->pm, state); |
e7176a37 DB |
503 | } |
504 | ||
35cd133c | 505 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 506 | info = "noirq driver "; |
35cd133c RW |
507 | callback = pm_noirq_op(dev->driver->pm, state); |
508 | } | |
509 | ||
9cf519d1 | 510 | error = dpm_run_callback(callback, dev, state, info); |
3d2699bc | 511 | dev->power.is_noirq_suspended = false; |
9cf519d1 | 512 | |
dbf37414 | 513 | Out: |
76569faa | 514 | complete_all(&dev->power.completion); |
775b64d2 RW |
515 | TRACE_RESUME(error); |
516 | return error; | |
517 | } | |
518 | ||
76569faa LC |
519 | static bool is_async(struct device *dev) |
520 | { | |
521 | return dev->power.async_suspend && pm_async_enabled | |
522 | && !pm_trace_is_enabled(); | |
523 | } | |
524 | ||
525 | static void async_resume_noirq(void *data, async_cookie_t cookie) | |
526 | { | |
527 | struct device *dev = (struct device *)data; | |
528 | int error; | |
529 | ||
530 | error = device_resume_noirq(dev, pm_transition, true); | |
531 | if (error) | |
532 | pm_dev_err(dev, pm_transition, " async", error); | |
533 | ||
534 | put_device(dev); | |
535 | } | |
536 | ||
775b64d2 | 537 | /** |
cf579dfb | 538 | * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices. |
20d652d7 | 539 | * @state: PM transition of the system being carried out. |
775b64d2 | 540 | * |
cf579dfb | 541 | * Call the "noirq" resume handlers for all devices in dpm_noirq_list and |
20d652d7 | 542 | * enable device drivers to receive interrupts. |
775b64d2 | 543 | */ |
2a8a8ce6 | 544 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 545 | { |
76569faa | 546 | struct device *dev; |
ecf762b2 | 547 | ktime_t starttime = ktime_get(); |
775b64d2 | 548 | |
bb3632c6 | 549 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, true); |
32bdfac5 | 550 | mutex_lock(&dpm_list_mtx); |
76569faa | 551 | pm_transition = state; |
d08a5ace | 552 | |
76569faa LC |
553 | /* |
554 | * Advanced the async threads upfront, | |
555 | * in case the starting of async threads is | |
556 | * delayed by non-async resuming devices. | |
557 | */ | |
558 | list_for_each_entry(dev, &dpm_noirq_list, power.entry) { | |
559 | reinit_completion(&dev->power.completion); | |
560 | if (is_async(dev)) { | |
561 | get_device(dev); | |
562 | async_schedule(async_resume_noirq, dev); | |
563 | } | |
564 | } | |
565 | ||
566 | while (!list_empty(&dpm_noirq_list)) { | |
567 | dev = to_device(dpm_noirq_list.next); | |
d08a5ace | 568 | get_device(dev); |
cf579dfb | 569 | list_move_tail(&dev->power.entry, &dpm_late_early_list); |
5b219a51 | 570 | mutex_unlock(&dpm_list_mtx); |
d08a5ace | 571 | |
76569faa LC |
572 | if (!is_async(dev)) { |
573 | int error; | |
574 | ||
575 | error = device_resume_noirq(dev, state, false); | |
576 | if (error) { | |
577 | suspend_stats.failed_resume_noirq++; | |
578 | dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); | |
579 | dpm_save_failed_dev(dev_name(dev)); | |
580 | pm_dev_err(dev, state, " noirq", error); | |
581 | } | |
cf579dfb RW |
582 | } |
583 | ||
584 | mutex_lock(&dpm_list_mtx); | |
585 | put_device(dev); | |
586 | } | |
587 | mutex_unlock(&dpm_list_mtx); | |
76569faa | 588 | async_synchronize_full(); |
cf579dfb RW |
589 | dpm_show_time(starttime, state, "noirq"); |
590 | resume_device_irqs(); | |
4990d4fe | 591 | device_wakeup_disarm_wake_irqs(); |
8651f97b | 592 | cpuidle_resume(); |
bb3632c6 | 593 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false); |
cf579dfb RW |
594 | } |
595 | ||
596 | /** | |
597 | * device_resume_early - Execute an "early resume" callback for given device. | |
598 | * @dev: Device to handle. | |
599 | * @state: PM transition of the system being carried out. | |
58c256a3 | 600 | * @async: If true, the device is being resumed asynchronously. |
cf579dfb RW |
601 | * |
602 | * Runtime PM is disabled for @dev while this function is being executed. | |
603 | */ | |
9e5e7910 | 604 | static int device_resume_early(struct device *dev, pm_message_t state, bool async) |
cf579dfb RW |
605 | { |
606 | pm_callback_t callback = NULL; | |
607 | char *info = NULL; | |
608 | int error = 0; | |
609 | ||
610 | TRACE_DEVICE(dev); | |
611 | TRACE_RESUME(0); | |
612 | ||
aae4518b | 613 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
614 | goto Out; |
615 | ||
3d2699bc LC |
616 | if (!dev->power.is_late_suspended) |
617 | goto Out; | |
618 | ||
9e5e7910 LC |
619 | dpm_wait(dev->parent, async); |
620 | ||
cf579dfb RW |
621 | if (dev->pm_domain) { |
622 | info = "early power domain "; | |
623 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
624 | } else if (dev->type && dev->type->pm) { | |
625 | info = "early type "; | |
626 | callback = pm_late_early_op(dev->type->pm, state); | |
627 | } else if (dev->class && dev->class->pm) { | |
628 | info = "early class "; | |
629 | callback = pm_late_early_op(dev->class->pm, state); | |
630 | } else if (dev->bus && dev->bus->pm) { | |
631 | info = "early bus "; | |
632 | callback = pm_late_early_op(dev->bus->pm, state); | |
633 | } | |
634 | ||
635 | if (!callback && dev->driver && dev->driver->pm) { | |
636 | info = "early driver "; | |
637 | callback = pm_late_early_op(dev->driver->pm, state); | |
638 | } | |
639 | ||
640 | error = dpm_run_callback(callback, dev, state, info); | |
3d2699bc | 641 | dev->power.is_late_suspended = false; |
cf579dfb | 642 | |
dbf37414 | 643 | Out: |
cf579dfb | 644 | TRACE_RESUME(error); |
9f6d8f6a RW |
645 | |
646 | pm_runtime_enable(dev); | |
9e5e7910 | 647 | complete_all(&dev->power.completion); |
cf579dfb RW |
648 | return error; |
649 | } | |
650 | ||
9e5e7910 LC |
651 | static void async_resume_early(void *data, async_cookie_t cookie) |
652 | { | |
653 | struct device *dev = (struct device *)data; | |
654 | int error; | |
655 | ||
656 | error = device_resume_early(dev, pm_transition, true); | |
657 | if (error) | |
658 | pm_dev_err(dev, pm_transition, " async", error); | |
659 | ||
660 | put_device(dev); | |
661 | } | |
662 | ||
cf579dfb RW |
663 | /** |
664 | * dpm_resume_early - Execute "early resume" callbacks for all devices. | |
665 | * @state: PM transition of the system being carried out. | |
666 | */ | |
2a8a8ce6 | 667 | void dpm_resume_early(pm_message_t state) |
cf579dfb | 668 | { |
9e5e7910 | 669 | struct device *dev; |
cf579dfb RW |
670 | ktime_t starttime = ktime_get(); |
671 | ||
bb3632c6 | 672 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, true); |
cf579dfb | 673 | mutex_lock(&dpm_list_mtx); |
9e5e7910 LC |
674 | pm_transition = state; |
675 | ||
676 | /* | |
677 | * Advanced the async threads upfront, | |
678 | * in case the starting of async threads is | |
679 | * delayed by non-async resuming devices. | |
680 | */ | |
681 | list_for_each_entry(dev, &dpm_late_early_list, power.entry) { | |
682 | reinit_completion(&dev->power.completion); | |
683 | if (is_async(dev)) { | |
684 | get_device(dev); | |
685 | async_schedule(async_resume_early, dev); | |
686 | } | |
687 | } | |
cf579dfb | 688 | |
9e5e7910 LC |
689 | while (!list_empty(&dpm_late_early_list)) { |
690 | dev = to_device(dpm_late_early_list.next); | |
cf579dfb RW |
691 | get_device(dev); |
692 | list_move_tail(&dev->power.entry, &dpm_suspended_list); | |
693 | mutex_unlock(&dpm_list_mtx); | |
694 | ||
9e5e7910 LC |
695 | if (!is_async(dev)) { |
696 | int error; | |
d08a5ace | 697 | |
9e5e7910 LC |
698 | error = device_resume_early(dev, state, false); |
699 | if (error) { | |
700 | suspend_stats.failed_resume_early++; | |
701 | dpm_save_failed_step(SUSPEND_RESUME_EARLY); | |
702 | dpm_save_failed_dev(dev_name(dev)); | |
703 | pm_dev_err(dev, state, " early", error); | |
704 | } | |
705 | } | |
5b219a51 | 706 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
707 | put_device(dev); |
708 | } | |
32bdfac5 | 709 | mutex_unlock(&dpm_list_mtx); |
9e5e7910 | 710 | async_synchronize_full(); |
ecf762b2 | 711 | dpm_show_time(starttime, state, "early"); |
bb3632c6 | 712 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, false); |
775b64d2 | 713 | } |
cf579dfb RW |
714 | |
715 | /** | |
716 | * dpm_resume_start - Execute "noirq" and "early" device callbacks. | |
717 | * @state: PM transition of the system being carried out. | |
718 | */ | |
719 | void dpm_resume_start(pm_message_t state) | |
720 | { | |
721 | dpm_resume_noirq(state); | |
722 | dpm_resume_early(state); | |
723 | } | |
724 | EXPORT_SYMBOL_GPL(dpm_resume_start); | |
775b64d2 RW |
725 | |
726 | /** | |
97df8c12 | 727 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
728 | * @dev: Device to handle. |
729 | * @state: PM transition of the system being carried out. | |
5af84b82 | 730 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 731 | */ |
97df8c12 | 732 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 733 | { |
9cf519d1 RW |
734 | pm_callback_t callback = NULL; |
735 | char *info = NULL; | |
775b64d2 | 736 | int error = 0; |
70fea60d | 737 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
775b64d2 RW |
738 | |
739 | TRACE_DEVICE(dev); | |
740 | TRACE_RESUME(0); | |
cd59abfc | 741 | |
dbf37414 RW |
742 | if (dev->power.syscore) |
743 | goto Complete; | |
744 | ||
aae4518b RW |
745 | if (dev->power.direct_complete) { |
746 | /* Match the pm_runtime_disable() in __device_suspend(). */ | |
747 | pm_runtime_enable(dev); | |
748 | goto Complete; | |
749 | } | |
750 | ||
5af84b82 | 751 | dpm_wait(dev->parent, async); |
70fea60d | 752 | dpm_watchdog_set(&wd, dev); |
8e9394ce | 753 | device_lock(dev); |
7a8d37a3 | 754 | |
f76b168b AS |
755 | /* |
756 | * This is a fib. But we'll allow new children to be added below | |
757 | * a resumed device, even if the device hasn't been completed yet. | |
758 | */ | |
759 | dev->power.is_prepared = false; | |
97df8c12 | 760 | |
6d0e0e84 AS |
761 | if (!dev->power.is_suspended) |
762 | goto Unlock; | |
763 | ||
564b905a | 764 | if (dev->pm_domain) { |
9cf519d1 RW |
765 | info = "power domain "; |
766 | callback = pm_op(&dev->pm_domain->ops, state); | |
35cd133c | 767 | goto Driver; |
7538e3db RW |
768 | } |
769 | ||
9659cc06 | 770 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
771 | info = "type "; |
772 | callback = pm_op(dev->type->pm, state); | |
35cd133c | 773 | goto Driver; |
cd59abfc AS |
774 | } |
775 | ||
1eede070 RW |
776 | if (dev->class) { |
777 | if (dev->class->pm) { | |
9cf519d1 RW |
778 | info = "class "; |
779 | callback = pm_op(dev->class->pm, state); | |
35cd133c | 780 | goto Driver; |
1eede070 | 781 | } else if (dev->class->resume) { |
9cf519d1 RW |
782 | info = "legacy class "; |
783 | callback = dev->class->resume; | |
9659cc06 | 784 | goto End; |
1eede070 | 785 | } |
cd59abfc | 786 | } |
9659cc06 RW |
787 | |
788 | if (dev->bus) { | |
789 | if (dev->bus->pm) { | |
35cd133c | 790 | info = "bus "; |
9cf519d1 | 791 | callback = pm_op(dev->bus->pm, state); |
9659cc06 | 792 | } else if (dev->bus->resume) { |
35cd133c | 793 | info = "legacy bus "; |
9cf519d1 | 794 | callback = dev->bus->resume; |
35cd133c | 795 | goto End; |
9659cc06 RW |
796 | } |
797 | } | |
798 | ||
35cd133c RW |
799 | Driver: |
800 | if (!callback && dev->driver && dev->driver->pm) { | |
801 | info = "driver "; | |
802 | callback = pm_op(dev->driver->pm, state); | |
803 | } | |
804 | ||
1eede070 | 805 | End: |
9cf519d1 | 806 | error = dpm_run_callback(callback, dev, state, info); |
6d0e0e84 AS |
807 | dev->power.is_suspended = false; |
808 | ||
809 | Unlock: | |
8e9394ce | 810 | device_unlock(dev); |
70fea60d | 811 | dpm_watchdog_clear(&wd); |
dbf37414 RW |
812 | |
813 | Complete: | |
5af84b82 | 814 | complete_all(&dev->power.completion); |
7a8d37a3 | 815 | |
cd59abfc | 816 | TRACE_RESUME(error); |
1e2ef05b | 817 | |
cd59abfc AS |
818 | return error; |
819 | } | |
820 | ||
5af84b82 RW |
821 | static void async_resume(void *data, async_cookie_t cookie) |
822 | { | |
823 | struct device *dev = (struct device *)data; | |
824 | int error; | |
825 | ||
97df8c12 | 826 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
827 | if (error) |
828 | pm_dev_err(dev, pm_transition, " async", error); | |
829 | put_device(dev); | |
830 | } | |
831 | ||
775b64d2 | 832 | /** |
20d652d7 RW |
833 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
834 | * @state: PM transition of the system being carried out. | |
775b64d2 | 835 | * |
20d652d7 RW |
836 | * Execute the appropriate "resume" callback for all devices whose status |
837 | * indicates that they are suspended. | |
1eede070 | 838 | */ |
91e7c75b | 839 | void dpm_resume(pm_message_t state) |
1eede070 | 840 | { |
97df8c12 | 841 | struct device *dev; |
ecf762b2 | 842 | ktime_t starttime = ktime_get(); |
1eede070 | 843 | |
bb3632c6 | 844 | trace_suspend_resume(TPS("dpm_resume"), state.event, true); |
91e7c75b RW |
845 | might_sleep(); |
846 | ||
1eede070 | 847 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 848 | pm_transition = state; |
098dff73 | 849 | async_error = 0; |
1eede070 | 850 | |
8a43a9ab | 851 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
16735d02 | 852 | reinit_completion(&dev->power.completion); |
97df8c12 RW |
853 | if (is_async(dev)) { |
854 | get_device(dev); | |
855 | async_schedule(async_resume, dev); | |
856 | } | |
857 | } | |
858 | ||
8a43a9ab RW |
859 | while (!list_empty(&dpm_suspended_list)) { |
860 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 861 | get_device(dev); |
5b219a51 | 862 | if (!is_async(dev)) { |
1eede070 RW |
863 | int error; |
864 | ||
1eede070 RW |
865 | mutex_unlock(&dpm_list_mtx); |
866 | ||
97df8c12 | 867 | error = device_resume(dev, state, false); |
2a77c46d SL |
868 | if (error) { |
869 | suspend_stats.failed_resume++; | |
870 | dpm_save_failed_step(SUSPEND_RESUME); | |
871 | dpm_save_failed_dev(dev_name(dev)); | |
1eede070 | 872 | pm_dev_err(dev, state, "", error); |
2a77c46d | 873 | } |
5b219a51 RW |
874 | |
875 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
876 | } |
877 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 878 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
879 | put_device(dev); |
880 | } | |
1eede070 | 881 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 882 | async_synchronize_full(); |
ecf762b2 | 883 | dpm_show_time(starttime, state, NULL); |
2f0aea93 VK |
884 | |
885 | cpufreq_resume(); | |
bb3632c6 | 886 | trace_suspend_resume(TPS("dpm_resume"), state.event, false); |
1eede070 RW |
887 | } |
888 | ||
889 | /** | |
20d652d7 RW |
890 | * device_complete - Complete a PM transition for given device. |
891 | * @dev: Device to handle. | |
892 | * @state: PM transition of the system being carried out. | |
1eede070 | 893 | */ |
d1616302 | 894 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 895 | { |
35cd133c RW |
896 | void (*callback)(struct device *) = NULL; |
897 | char *info = NULL; | |
898 | ||
dbf37414 RW |
899 | if (dev->power.syscore) |
900 | return; | |
901 | ||
8e9394ce | 902 | device_lock(dev); |
1eede070 | 903 | |
564b905a | 904 | if (dev->pm_domain) { |
35cd133c RW |
905 | info = "completing power domain "; |
906 | callback = dev->pm_domain->ops.complete; | |
4d27e9dc | 907 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
908 | info = "completing type "; |
909 | callback = dev->type->pm->complete; | |
9659cc06 | 910 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
911 | info = "completing class "; |
912 | callback = dev->class->pm->complete; | |
9659cc06 | 913 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
914 | info = "completing bus "; |
915 | callback = dev->bus->pm->complete; | |
916 | } | |
917 | ||
918 | if (!callback && dev->driver && dev->driver->pm) { | |
919 | info = "completing driver "; | |
920 | callback = dev->driver->pm->complete; | |
921 | } | |
922 | ||
923 | if (callback) { | |
924 | pm_dev_dbg(dev, state, info); | |
925 | callback(dev); | |
1eede070 RW |
926 | } |
927 | ||
8e9394ce | 928 | device_unlock(dev); |
88d26136 | 929 | |
af939339 | 930 | pm_runtime_put(dev); |
1eede070 RW |
931 | } |
932 | ||
933 | /** | |
20d652d7 RW |
934 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
935 | * @state: PM transition of the system being carried out. | |
775b64d2 | 936 | * |
20d652d7 RW |
937 | * Execute the ->complete() callbacks for all devices whose PM status is not |
938 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 939 | */ |
91e7c75b | 940 | void dpm_complete(pm_message_t state) |
cd59abfc | 941 | { |
1eede070 RW |
942 | struct list_head list; |
943 | ||
bb3632c6 | 944 | trace_suspend_resume(TPS("dpm_complete"), state.event, true); |
91e7c75b RW |
945 | might_sleep(); |
946 | ||
1eede070 | 947 | INIT_LIST_HEAD(&list); |
cd59abfc | 948 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
949 | while (!list_empty(&dpm_prepared_list)) { |
950 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 951 | |
1eede070 | 952 | get_device(dev); |
f76b168b | 953 | dev->power.is_prepared = false; |
5b219a51 RW |
954 | list_move(&dev->power.entry, &list); |
955 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 956 | |
32e8d689 | 957 | trace_device_pm_callback_start(dev, "", state.event); |
5b219a51 | 958 | device_complete(dev, state); |
32e8d689 | 959 | trace_device_pm_callback_end(dev, 0); |
1eede070 | 960 | |
5b219a51 | 961 | mutex_lock(&dpm_list_mtx); |
1eede070 | 962 | put_device(dev); |
cd59abfc | 963 | } |
1eede070 | 964 | list_splice(&list, &dpm_list); |
cd59abfc | 965 | mutex_unlock(&dpm_list_mtx); |
bb3632c6 | 966 | trace_suspend_resume(TPS("dpm_complete"), state.event, false); |
cd59abfc AS |
967 | } |
968 | ||
cd59abfc | 969 | /** |
20d652d7 RW |
970 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
971 | * @state: PM transition of the system being carried out. | |
cd59abfc | 972 | * |
20d652d7 RW |
973 | * Execute "resume" callbacks for all devices and complete the PM transition of |
974 | * the system. | |
cd59abfc | 975 | */ |
d1616302 | 976 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 977 | { |
1eede070 RW |
978 | dpm_resume(state); |
979 | dpm_complete(state); | |
cd59abfc | 980 | } |
d1616302 | 981 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
982 | |
983 | ||
984 | /*------------------------- Suspend routines -------------------------*/ | |
985 | ||
1eede070 | 986 | /** |
20d652d7 RW |
987 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
988 | * @sleep_state: PM message representing a sleep state. | |
989 | * | |
990 | * Return a PM message representing the resume event corresponding to given | |
991 | * sleep state. | |
1eede070 RW |
992 | */ |
993 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 994 | { |
1eede070 RW |
995 | switch (sleep_state.event) { |
996 | case PM_EVENT_SUSPEND: | |
997 | return PMSG_RESUME; | |
998 | case PM_EVENT_FREEZE: | |
999 | case PM_EVENT_QUIESCE: | |
1000 | return PMSG_RECOVER; | |
1001 | case PM_EVENT_HIBERNATE: | |
1002 | return PMSG_RESTORE; | |
cd59abfc | 1003 | } |
1eede070 | 1004 | return PMSG_ON; |
cd59abfc AS |
1005 | } |
1006 | ||
1007 | /** | |
20d652d7 RW |
1008 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
1009 | * @dev: Device to handle. | |
1010 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1011 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1012 | * |
20d652d7 RW |
1013 | * The driver of @dev will not receive interrupts while this function is being |
1014 | * executed. | |
cd59abfc | 1015 | */ |
28b6fd6e | 1016 | static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 1017 | { |
9cf519d1 RW |
1018 | pm_callback_t callback = NULL; |
1019 | char *info = NULL; | |
28b6fd6e LC |
1020 | int error = 0; |
1021 | ||
431d452a ZF |
1022 | TRACE_DEVICE(dev); |
1023 | TRACE_SUSPEND(0); | |
1024 | ||
28b6fd6e LC |
1025 | if (async_error) |
1026 | goto Complete; | |
1027 | ||
1028 | if (pm_wakeup_pending()) { | |
1029 | async_error = -EBUSY; | |
1030 | goto Complete; | |
1031 | } | |
e7176a37 | 1032 | |
aae4518b | 1033 | if (dev->power.syscore || dev->power.direct_complete) |
28b6fd6e LC |
1034 | goto Complete; |
1035 | ||
1036 | dpm_wait_for_children(dev, async); | |
dbf37414 | 1037 | |
564b905a | 1038 | if (dev->pm_domain) { |
cf579dfb | 1039 | info = "noirq power domain "; |
9cf519d1 | 1040 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 1041 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 1042 | info = "noirq type "; |
9cf519d1 | 1043 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 1044 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 1045 | info = "noirq class "; |
9cf519d1 | 1046 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 1047 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 1048 | info = "noirq bus "; |
9cf519d1 | 1049 | callback = pm_noirq_op(dev->bus->pm, state); |
7538e3db RW |
1050 | } |
1051 | ||
35cd133c | 1052 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 1053 | info = "noirq driver "; |
35cd133c RW |
1054 | callback = pm_noirq_op(dev->driver->pm, state); |
1055 | } | |
1056 | ||
3d2699bc LC |
1057 | error = dpm_run_callback(callback, dev, state, info); |
1058 | if (!error) | |
1059 | dev->power.is_noirq_suspended = true; | |
28b6fd6e LC |
1060 | else |
1061 | async_error = error; | |
3d2699bc | 1062 | |
28b6fd6e LC |
1063 | Complete: |
1064 | complete_all(&dev->power.completion); | |
431d452a | 1065 | TRACE_SUSPEND(error); |
3d2699bc | 1066 | return error; |
775b64d2 RW |
1067 | } |
1068 | ||
28b6fd6e LC |
1069 | static void async_suspend_noirq(void *data, async_cookie_t cookie) |
1070 | { | |
1071 | struct device *dev = (struct device *)data; | |
1072 | int error; | |
1073 | ||
1074 | error = __device_suspend_noirq(dev, pm_transition, true); | |
1075 | if (error) { | |
1076 | dpm_save_failed_dev(dev_name(dev)); | |
1077 | pm_dev_err(dev, pm_transition, " async", error); | |
1078 | } | |
1079 | ||
1080 | put_device(dev); | |
1081 | } | |
1082 | ||
1083 | static int device_suspend_noirq(struct device *dev) | |
1084 | { | |
1085 | reinit_completion(&dev->power.completion); | |
1086 | ||
431d452a | 1087 | if (is_async(dev)) { |
28b6fd6e LC |
1088 | get_device(dev); |
1089 | async_schedule(async_suspend_noirq, dev); | |
1090 | return 0; | |
1091 | } | |
1092 | return __device_suspend_noirq(dev, pm_transition, false); | |
1093 | } | |
1094 | ||
775b64d2 | 1095 | /** |
cf579dfb | 1096 | * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices. |
20d652d7 | 1097 | * @state: PM transition of the system being carried out. |
775b64d2 | 1098 | * |
20d652d7 RW |
1099 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
1100 | * handlers for all non-sysdev devices. | |
775b64d2 | 1101 | */ |
2a8a8ce6 | 1102 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 1103 | { |
ecf762b2 | 1104 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
1105 | int error = 0; |
1106 | ||
bb3632c6 | 1107 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true); |
8651f97b | 1108 | cpuidle_pause(); |
4990d4fe | 1109 | device_wakeup_arm_wake_irqs(); |
2ed8d2b3 | 1110 | suspend_device_irqs(); |
32bdfac5 | 1111 | mutex_lock(&dpm_list_mtx); |
28b6fd6e LC |
1112 | pm_transition = state; |
1113 | async_error = 0; | |
1114 | ||
cf579dfb RW |
1115 | while (!list_empty(&dpm_late_early_list)) { |
1116 | struct device *dev = to_device(dpm_late_early_list.prev); | |
d08a5ace RW |
1117 | |
1118 | get_device(dev); | |
1119 | mutex_unlock(&dpm_list_mtx); | |
1120 | ||
28b6fd6e | 1121 | error = device_suspend_noirq(dev); |
d08a5ace RW |
1122 | |
1123 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 1124 | if (error) { |
cf579dfb | 1125 | pm_dev_err(dev, state, " noirq", error); |
2a77c46d | 1126 | dpm_save_failed_dev(dev_name(dev)); |
d08a5ace | 1127 | put_device(dev); |
775b64d2 RW |
1128 | break; |
1129 | } | |
d08a5ace | 1130 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1131 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 1132 | put_device(dev); |
52d136cc | 1133 | |
28b6fd6e | 1134 | if (async_error) |
52d136cc | 1135 | break; |
775b64d2 | 1136 | } |
32bdfac5 | 1137 | mutex_unlock(&dpm_list_mtx); |
28b6fd6e LC |
1138 | async_synchronize_full(); |
1139 | if (!error) | |
1140 | error = async_error; | |
1141 | ||
1142 | if (error) { | |
1143 | suspend_stats.failed_suspend_noirq++; | |
1144 | dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); | |
d1616302 | 1145 | dpm_resume_noirq(resume_event(state)); |
28b6fd6e | 1146 | } else { |
cf579dfb | 1147 | dpm_show_time(starttime, state, "noirq"); |
28b6fd6e | 1148 | } |
bb3632c6 | 1149 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false); |
cf579dfb RW |
1150 | return error; |
1151 | } | |
1152 | ||
1153 | /** | |
1154 | * device_suspend_late - Execute a "late suspend" callback for given device. | |
1155 | * @dev: Device to handle. | |
1156 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1157 | * @async: If true, the device is being suspended asynchronously. |
cf579dfb RW |
1158 | * |
1159 | * Runtime PM is disabled for @dev while this function is being executed. | |
1160 | */ | |
de377b39 | 1161 | static int __device_suspend_late(struct device *dev, pm_message_t state, bool async) |
cf579dfb RW |
1162 | { |
1163 | pm_callback_t callback = NULL; | |
1164 | char *info = NULL; | |
de377b39 | 1165 | int error = 0; |
cf579dfb | 1166 | |
431d452a ZF |
1167 | TRACE_DEVICE(dev); |
1168 | TRACE_SUSPEND(0); | |
1169 | ||
9f6d8f6a RW |
1170 | __pm_runtime_disable(dev, false); |
1171 | ||
de377b39 LC |
1172 | if (async_error) |
1173 | goto Complete; | |
1174 | ||
1175 | if (pm_wakeup_pending()) { | |
1176 | async_error = -EBUSY; | |
1177 | goto Complete; | |
1178 | } | |
1179 | ||
aae4518b | 1180 | if (dev->power.syscore || dev->power.direct_complete) |
de377b39 LC |
1181 | goto Complete; |
1182 | ||
1183 | dpm_wait_for_children(dev, async); | |
dbf37414 | 1184 | |
cf579dfb RW |
1185 | if (dev->pm_domain) { |
1186 | info = "late power domain "; | |
1187 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
1188 | } else if (dev->type && dev->type->pm) { | |
1189 | info = "late type "; | |
1190 | callback = pm_late_early_op(dev->type->pm, state); | |
1191 | } else if (dev->class && dev->class->pm) { | |
1192 | info = "late class "; | |
1193 | callback = pm_late_early_op(dev->class->pm, state); | |
1194 | } else if (dev->bus && dev->bus->pm) { | |
1195 | info = "late bus "; | |
1196 | callback = pm_late_early_op(dev->bus->pm, state); | |
1197 | } | |
1198 | ||
1199 | if (!callback && dev->driver && dev->driver->pm) { | |
1200 | info = "late driver "; | |
1201 | callback = pm_late_early_op(dev->driver->pm, state); | |
1202 | } | |
1203 | ||
3d2699bc LC |
1204 | error = dpm_run_callback(callback, dev, state, info); |
1205 | if (!error) | |
1206 | dev->power.is_late_suspended = true; | |
de377b39 LC |
1207 | else |
1208 | async_error = error; | |
3d2699bc | 1209 | |
de377b39 | 1210 | Complete: |
431d452a | 1211 | TRACE_SUSPEND(error); |
de377b39 | 1212 | complete_all(&dev->power.completion); |
3d2699bc | 1213 | return error; |
cf579dfb RW |
1214 | } |
1215 | ||
de377b39 LC |
1216 | static void async_suspend_late(void *data, async_cookie_t cookie) |
1217 | { | |
1218 | struct device *dev = (struct device *)data; | |
1219 | int error; | |
1220 | ||
1221 | error = __device_suspend_late(dev, pm_transition, true); | |
1222 | if (error) { | |
1223 | dpm_save_failed_dev(dev_name(dev)); | |
1224 | pm_dev_err(dev, pm_transition, " async", error); | |
1225 | } | |
1226 | put_device(dev); | |
1227 | } | |
1228 | ||
1229 | static int device_suspend_late(struct device *dev) | |
1230 | { | |
1231 | reinit_completion(&dev->power.completion); | |
1232 | ||
431d452a | 1233 | if (is_async(dev)) { |
de377b39 LC |
1234 | get_device(dev); |
1235 | async_schedule(async_suspend_late, dev); | |
1236 | return 0; | |
1237 | } | |
1238 | ||
1239 | return __device_suspend_late(dev, pm_transition, false); | |
1240 | } | |
1241 | ||
cf579dfb RW |
1242 | /** |
1243 | * dpm_suspend_late - Execute "late suspend" callbacks for all devices. | |
1244 | * @state: PM transition of the system being carried out. | |
1245 | */ | |
2a8a8ce6 | 1246 | int dpm_suspend_late(pm_message_t state) |
cf579dfb RW |
1247 | { |
1248 | ktime_t starttime = ktime_get(); | |
1249 | int error = 0; | |
1250 | ||
bb3632c6 | 1251 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, true); |
cf579dfb | 1252 | mutex_lock(&dpm_list_mtx); |
de377b39 LC |
1253 | pm_transition = state; |
1254 | async_error = 0; | |
1255 | ||
cf579dfb RW |
1256 | while (!list_empty(&dpm_suspended_list)) { |
1257 | struct device *dev = to_device(dpm_suspended_list.prev); | |
1258 | ||
1259 | get_device(dev); | |
1260 | mutex_unlock(&dpm_list_mtx); | |
1261 | ||
de377b39 | 1262 | error = device_suspend_late(dev); |
cf579dfb RW |
1263 | |
1264 | mutex_lock(&dpm_list_mtx); | |
1265 | if (error) { | |
1266 | pm_dev_err(dev, state, " late", error); | |
cf579dfb RW |
1267 | dpm_save_failed_dev(dev_name(dev)); |
1268 | put_device(dev); | |
1269 | break; | |
1270 | } | |
1271 | if (!list_empty(&dev->power.entry)) | |
1272 | list_move(&dev->power.entry, &dpm_late_early_list); | |
1273 | put_device(dev); | |
52d136cc | 1274 | |
de377b39 | 1275 | if (async_error) |
52d136cc | 1276 | break; |
cf579dfb RW |
1277 | } |
1278 | mutex_unlock(&dpm_list_mtx); | |
de377b39 | 1279 | async_synchronize_full(); |
246ef766 ID |
1280 | if (!error) |
1281 | error = async_error; | |
de377b39 LC |
1282 | if (error) { |
1283 | suspend_stats.failed_suspend_late++; | |
1284 | dpm_save_failed_step(SUSPEND_SUSPEND_LATE); | |
cf579dfb | 1285 | dpm_resume_early(resume_event(state)); |
de377b39 | 1286 | } else { |
ecf762b2 | 1287 | dpm_show_time(starttime, state, "late"); |
de377b39 | 1288 | } |
bb3632c6 | 1289 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false); |
775b64d2 RW |
1290 | return error; |
1291 | } | |
cf579dfb RW |
1292 | |
1293 | /** | |
1294 | * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks. | |
1295 | * @state: PM transition of the system being carried out. | |
1296 | */ | |
1297 | int dpm_suspend_end(pm_message_t state) | |
1298 | { | |
1299 | int error = dpm_suspend_late(state); | |
064b021f CC |
1300 | if (error) |
1301 | return error; | |
1302 | ||
1303 | error = dpm_suspend_noirq(state); | |
1304 | if (error) { | |
997a0311 | 1305 | dpm_resume_early(resume_event(state)); |
064b021f CC |
1306 | return error; |
1307 | } | |
cf579dfb | 1308 | |
064b021f | 1309 | return 0; |
cf579dfb RW |
1310 | } |
1311 | EXPORT_SYMBOL_GPL(dpm_suspend_end); | |
775b64d2 | 1312 | |
875ab0b7 RW |
1313 | /** |
1314 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
1315 | * @dev: Device to suspend. |
1316 | * @state: PM transition of the system being carried out. | |
1317 | * @cb: Suspend callback to execute. | |
58c256a3 | 1318 | * @info: string description of caller. |
875ab0b7 RW |
1319 | */ |
1320 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
53644677 SK |
1321 | int (*cb)(struct device *dev, pm_message_t state), |
1322 | char *info) | |
875ab0b7 RW |
1323 | { |
1324 | int error; | |
1325 | ktime_t calltime; | |
1326 | ||
1327 | calltime = initcall_debug_start(dev); | |
1328 | ||
e8bca479 | 1329 | trace_device_pm_callback_start(dev, info, state.event); |
875ab0b7 | 1330 | error = cb(dev, state); |
e8bca479 | 1331 | trace_device_pm_callback_end(dev, error); |
875ab0b7 RW |
1332 | suspend_report_result(cb, error); |
1333 | ||
53644677 | 1334 | initcall_debug_report(dev, calltime, error, state, info); |
875ab0b7 RW |
1335 | |
1336 | return error; | |
1337 | } | |
1338 | ||
775b64d2 | 1339 | /** |
20d652d7 RW |
1340 | * device_suspend - Execute "suspend" callbacks for given device. |
1341 | * @dev: Device to handle. | |
1342 | * @state: PM transition of the system being carried out. | |
5af84b82 | 1343 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1344 | */ |
5af84b82 | 1345 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 1346 | { |
9cf519d1 RW |
1347 | pm_callback_t callback = NULL; |
1348 | char *info = NULL; | |
cd59abfc | 1349 | int error = 0; |
70fea60d | 1350 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
cd59abfc | 1351 | |
431d452a ZF |
1352 | TRACE_DEVICE(dev); |
1353 | TRACE_SUSPEND(0); | |
1354 | ||
5af84b82 | 1355 | dpm_wait_for_children(dev, async); |
7a8d37a3 | 1356 | |
5af84b82 | 1357 | if (async_error) |
1f758b23 | 1358 | goto Complete; |
1e2ef05b | 1359 | |
88d26136 AS |
1360 | /* |
1361 | * If a device configured to wake up the system from sleep states | |
1362 | * has been suspended at run time and there's a resume request pending | |
1363 | * for it, this is equivalent to the device signaling wakeup, so the | |
1364 | * system suspend operation should be aborted. | |
1365 | */ | |
1e2ef05b RW |
1366 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1367 | pm_wakeup_event(dev, 0); | |
5af84b82 | 1368 | |
d83f905e RW |
1369 | if (pm_wakeup_pending()) { |
1370 | async_error = -EBUSY; | |
1f758b23 | 1371 | goto Complete; |
d83f905e RW |
1372 | } |
1373 | ||
dbf37414 RW |
1374 | if (dev->power.syscore) |
1375 | goto Complete; | |
1376 | ||
aae4518b RW |
1377 | if (dev->power.direct_complete) { |
1378 | if (pm_runtime_status_suspended(dev)) { | |
1379 | pm_runtime_disable(dev); | |
1380 | if (pm_runtime_suspended_if_enabled(dev)) | |
1381 | goto Complete; | |
1382 | ||
1383 | pm_runtime_enable(dev); | |
1384 | } | |
1385 | dev->power.direct_complete = false; | |
1386 | } | |
1387 | ||
70fea60d | 1388 | dpm_watchdog_set(&wd, dev); |
1e2ef05b RW |
1389 | device_lock(dev); |
1390 | ||
564b905a | 1391 | if (dev->pm_domain) { |
9cf519d1 RW |
1392 | info = "power domain "; |
1393 | callback = pm_op(&dev->pm_domain->ops, state); | |
1394 | goto Run; | |
4d27e9dc RW |
1395 | } |
1396 | ||
9659cc06 | 1397 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
1398 | info = "type "; |
1399 | callback = pm_op(dev->type->pm, state); | |
1400 | goto Run; | |
9659cc06 RW |
1401 | } |
1402 | ||
1eede070 RW |
1403 | if (dev->class) { |
1404 | if (dev->class->pm) { | |
9cf519d1 RW |
1405 | info = "class "; |
1406 | callback = pm_op(dev->class->pm, state); | |
1407 | goto Run; | |
1eede070 RW |
1408 | } else if (dev->class->suspend) { |
1409 | pm_dev_dbg(dev, state, "legacy class "); | |
53644677 SK |
1410 | error = legacy_suspend(dev, state, dev->class->suspend, |
1411 | "legacy class "); | |
4d27e9dc | 1412 | goto End; |
1eede070 | 1413 | } |
cd59abfc AS |
1414 | } |
1415 | ||
1eede070 RW |
1416 | if (dev->bus) { |
1417 | if (dev->bus->pm) { | |
35cd133c | 1418 | info = "bus "; |
9cf519d1 | 1419 | callback = pm_op(dev->bus->pm, state); |
1eede070 | 1420 | } else if (dev->bus->suspend) { |
35cd133c | 1421 | pm_dev_dbg(dev, state, "legacy bus "); |
53644677 SK |
1422 | error = legacy_suspend(dev, state, dev->bus->suspend, |
1423 | "legacy bus "); | |
9cf519d1 | 1424 | goto End; |
1eede070 | 1425 | } |
7538e3db RW |
1426 | } |
1427 | ||
9cf519d1 | 1428 | Run: |
35cd133c RW |
1429 | if (!callback && dev->driver && dev->driver->pm) { |
1430 | info = "driver "; | |
1431 | callback = pm_op(dev->driver->pm, state); | |
1432 | } | |
1433 | ||
9cf519d1 RW |
1434 | error = dpm_run_callback(callback, dev, state, info); |
1435 | ||
1eede070 | 1436 | End: |
4ca46ff3 | 1437 | if (!error) { |
aae4518b RW |
1438 | struct device *parent = dev->parent; |
1439 | ||
4ca46ff3 | 1440 | dev->power.is_suspended = true; |
aae4518b RW |
1441 | if (parent) { |
1442 | spin_lock_irq(&parent->power.lock); | |
1443 | ||
1444 | dev->parent->power.direct_complete = false; | |
1445 | if (dev->power.wakeup_path | |
1446 | && !dev->parent->power.ignore_children) | |
1447 | dev->parent->power.wakeup_path = true; | |
1448 | ||
1449 | spin_unlock_irq(&parent->power.lock); | |
1450 | } | |
4ca46ff3 | 1451 | } |
6d0e0e84 | 1452 | |
8e9394ce | 1453 | device_unlock(dev); |
70fea60d | 1454 | dpm_watchdog_clear(&wd); |
1f758b23 MSB |
1455 | |
1456 | Complete: | |
5af84b82 | 1457 | complete_all(&dev->power.completion); |
88d26136 | 1458 | if (error) |
098dff73 RW |
1459 | async_error = error; |
1460 | ||
431d452a | 1461 | TRACE_SUSPEND(error); |
cd59abfc AS |
1462 | return error; |
1463 | } | |
1464 | ||
5af84b82 RW |
1465 | static void async_suspend(void *data, async_cookie_t cookie) |
1466 | { | |
1467 | struct device *dev = (struct device *)data; | |
1468 | int error; | |
1469 | ||
1470 | error = __device_suspend(dev, pm_transition, true); | |
2a77c46d SL |
1471 | if (error) { |
1472 | dpm_save_failed_dev(dev_name(dev)); | |
5af84b82 | 1473 | pm_dev_err(dev, pm_transition, " async", error); |
2a77c46d | 1474 | } |
5af84b82 RW |
1475 | |
1476 | put_device(dev); | |
1477 | } | |
1478 | ||
1479 | static int device_suspend(struct device *dev) | |
1480 | { | |
16735d02 | 1481 | reinit_completion(&dev->power.completion); |
5af84b82 | 1482 | |
431d452a | 1483 | if (is_async(dev)) { |
5af84b82 RW |
1484 | get_device(dev); |
1485 | async_schedule(async_suspend, dev); | |
1486 | return 0; | |
1487 | } | |
1488 | ||
1489 | return __device_suspend(dev, pm_transition, false); | |
1490 | } | |
1491 | ||
cd59abfc | 1492 | /** |
20d652d7 RW |
1493 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
1494 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1495 | */ |
91e7c75b | 1496 | int dpm_suspend(pm_message_t state) |
cd59abfc | 1497 | { |
ecf762b2 | 1498 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
1499 | int error = 0; |
1500 | ||
bb3632c6 | 1501 | trace_suspend_resume(TPS("dpm_suspend"), state.event, true); |
91e7c75b RW |
1502 | might_sleep(); |
1503 | ||
2f0aea93 VK |
1504 | cpufreq_suspend(); |
1505 | ||
cd59abfc | 1506 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
1507 | pm_transition = state; |
1508 | async_error = 0; | |
8a43a9ab RW |
1509 | while (!list_empty(&dpm_prepared_list)) { |
1510 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 1511 | |
1eede070 | 1512 | get_device(dev); |
cd59abfc | 1513 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 1514 | |
5af84b82 | 1515 | error = device_suspend(dev); |
1eede070 | 1516 | |
1b3cbec1 | 1517 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 1518 | if (error) { |
1eede070 | 1519 | pm_dev_err(dev, state, "", error); |
2a77c46d | 1520 | dpm_save_failed_dev(dev_name(dev)); |
1eede070 | 1521 | put_device(dev); |
775b64d2 RW |
1522 | break; |
1523 | } | |
7a8d37a3 | 1524 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1525 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 1526 | put_device(dev); |
5af84b82 RW |
1527 | if (async_error) |
1528 | break; | |
cd59abfc AS |
1529 | } |
1530 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
1531 | async_synchronize_full(); |
1532 | if (!error) | |
1533 | error = async_error; | |
2a77c46d SL |
1534 | if (error) { |
1535 | suspend_stats.failed_suspend++; | |
1536 | dpm_save_failed_step(SUSPEND_SUSPEND); | |
1537 | } else | |
ecf762b2 | 1538 | dpm_show_time(starttime, state, NULL); |
bb3632c6 | 1539 | trace_suspend_resume(TPS("dpm_suspend"), state.event, false); |
1eede070 RW |
1540 | return error; |
1541 | } | |
1542 | ||
1543 | /** | |
20d652d7 RW |
1544 | * device_prepare - Prepare a device for system power transition. |
1545 | * @dev: Device to handle. | |
1546 | * @state: PM transition of the system being carried out. | |
1547 | * | |
1548 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
1549 | * device may be registered after this function has returned. | |
1eede070 | 1550 | */ |
d1616302 | 1551 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 | 1552 | { |
35cd133c RW |
1553 | int (*callback)(struct device *) = NULL; |
1554 | char *info = NULL; | |
aae4518b | 1555 | int ret = 0; |
1eede070 | 1556 | |
dbf37414 RW |
1557 | if (dev->power.syscore) |
1558 | return 0; | |
1559 | ||
88d26136 AS |
1560 | /* |
1561 | * If a device's parent goes into runtime suspend at the wrong time, | |
1562 | * it won't be possible to resume the device. To prevent this we | |
1563 | * block runtime suspend here, during the prepare phase, and allow | |
1564 | * it again during the complete phase. | |
1565 | */ | |
1566 | pm_runtime_get_noresume(dev); | |
1567 | ||
8e9394ce | 1568 | device_lock(dev); |
1eede070 | 1569 | |
4ca46ff3 RW |
1570 | dev->power.wakeup_path = device_may_wakeup(dev); |
1571 | ||
564b905a | 1572 | if (dev->pm_domain) { |
35cd133c RW |
1573 | info = "preparing power domain "; |
1574 | callback = dev->pm_domain->ops.prepare; | |
4d27e9dc | 1575 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
1576 | info = "preparing type "; |
1577 | callback = dev->type->pm->prepare; | |
9659cc06 | 1578 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
1579 | info = "preparing class "; |
1580 | callback = dev->class->pm->prepare; | |
9659cc06 | 1581 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
1582 | info = "preparing bus "; |
1583 | callback = dev->bus->pm->prepare; | |
1584 | } | |
1585 | ||
1586 | if (!callback && dev->driver && dev->driver->pm) { | |
1587 | info = "preparing driver "; | |
1588 | callback = dev->driver->pm->prepare; | |
1589 | } | |
1590 | ||
32e8d689 | 1591 | if (callback) |
aae4518b | 1592 | ret = callback(dev); |
7538e3db | 1593 | |
8e9394ce | 1594 | device_unlock(dev); |
1eede070 | 1595 | |
aae4518b RW |
1596 | if (ret < 0) { |
1597 | suspend_report_result(callback, ret); | |
aa1b9f13 | 1598 | pm_runtime_put(dev); |
aae4518b RW |
1599 | return ret; |
1600 | } | |
1601 | /* | |
1602 | * A positive return value from ->prepare() means "this device appears | |
1603 | * to be runtime-suspended and its state is fine, so if it really is | |
1604 | * runtime-suspended, you can leave it in that state provided that you | |
1605 | * will do the same thing with all of its descendants". This only | |
1606 | * applies to suspend transitions, however. | |
1607 | */ | |
1608 | spin_lock_irq(&dev->power.lock); | |
1609 | dev->power.direct_complete = ret > 0 && state.event == PM_EVENT_SUSPEND; | |
1610 | spin_unlock_irq(&dev->power.lock); | |
1611 | return 0; | |
1eede070 | 1612 | } |
cd59abfc | 1613 | |
1eede070 | 1614 | /** |
20d652d7 RW |
1615 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1616 | * @state: PM transition of the system being carried out. | |
1eede070 | 1617 | * |
20d652d7 | 1618 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 | 1619 | */ |
91e7c75b | 1620 | int dpm_prepare(pm_message_t state) |
1eede070 | 1621 | { |
1eede070 RW |
1622 | int error = 0; |
1623 | ||
bb3632c6 | 1624 | trace_suspend_resume(TPS("dpm_prepare"), state.event, true); |
91e7c75b RW |
1625 | might_sleep(); |
1626 | ||
1eede070 | 1627 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
1628 | while (!list_empty(&dpm_list)) { |
1629 | struct device *dev = to_device(dpm_list.next); | |
1630 | ||
1631 | get_device(dev); | |
1eede070 RW |
1632 | mutex_unlock(&dpm_list_mtx); |
1633 | ||
32e8d689 | 1634 | trace_device_pm_callback_start(dev, "", state.event); |
1e2ef05b | 1635 | error = device_prepare(dev, state); |
32e8d689 | 1636 | trace_device_pm_callback_end(dev, error); |
1eede070 RW |
1637 | |
1638 | mutex_lock(&dpm_list_mtx); | |
1639 | if (error) { | |
1eede070 RW |
1640 | if (error == -EAGAIN) { |
1641 | put_device(dev); | |
886a7a33 | 1642 | error = 0; |
1eede070 RW |
1643 | continue; |
1644 | } | |
1e75227e RW |
1645 | printk(KERN_INFO "PM: Device %s not prepared " |
1646 | "for power transition: code %d\n", | |
5c1a07ab | 1647 | dev_name(dev), error); |
1eede070 RW |
1648 | put_device(dev); |
1649 | break; | |
1650 | } | |
f76b168b | 1651 | dev->power.is_prepared = true; |
1eede070 | 1652 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1653 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1654 | put_device(dev); |
1655 | } | |
1eede070 | 1656 | mutex_unlock(&dpm_list_mtx); |
bb3632c6 | 1657 | trace_suspend_resume(TPS("dpm_prepare"), state.event, false); |
cd59abfc AS |
1658 | return error; |
1659 | } | |
1660 | ||
775b64d2 | 1661 | /** |
20d652d7 RW |
1662 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1663 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1664 | * |
20d652d7 RW |
1665 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1666 | * callbacks for them. | |
775b64d2 | 1667 | */ |
d1616302 | 1668 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1669 | { |
1670 | int error; | |
cd59abfc | 1671 | |
1eede070 | 1672 | error = dpm_prepare(state); |
2a77c46d SL |
1673 | if (error) { |
1674 | suspend_stats.failed_prepare++; | |
1675 | dpm_save_failed_step(SUSPEND_PREPARE); | |
1676 | } else | |
1eede070 | 1677 | error = dpm_suspend(state); |
cd59abfc | 1678 | return error; |
cd59abfc | 1679 | } |
d1616302 | 1680 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1681 | |
1682 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1683 | { | |
c80cfb04 BH |
1684 | if (ret) |
1685 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1686 | } |
1687 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1688 | |
1689 | /** | |
1690 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1691 | * @dev: Device to wait for. | |
1692 | * @subordinate: Device that needs to wait for @dev. | |
1693 | */ | |
098dff73 | 1694 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1695 | { |
1696 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1697 | return async_error; |
f8824cee RW |
1698 | } |
1699 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); | |
dfe3212e ML |
1700 | |
1701 | /** | |
1702 | * dpm_for_each_dev - device iterator. | |
1703 | * @data: data for the callback. | |
1704 | * @fn: function to be called for each device. | |
1705 | * | |
1706 | * Iterate over devices in dpm_list, and call @fn for each device, | |
1707 | * passing it @data. | |
1708 | */ | |
1709 | void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) | |
1710 | { | |
1711 | struct device *dev; | |
1712 | ||
1713 | if (!fn) | |
1714 | return; | |
1715 | ||
1716 | device_pm_lock(); | |
1717 | list_for_each_entry(dev, &dpm_list, power.entry) | |
1718 | fn(dev, data); | |
1719 | device_pm_unlock(); | |
1720 | } | |
1721 | EXPORT_SYMBOL_GPL(dpm_for_each_dev); |