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