Commit | Line | Data |
---|---|---|
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)); |
aa8e54b5 | 128 | device_pm_check_callbacks(dev); |
11048dcf | 129 | mutex_lock(&dpm_list_mtx); |
f76b168b | 130 | if (dev->parent && dev->parent->power.is_prepared) |
b64959e6 RW |
131 | dev_warn(dev, "parent %s should not be sleeping\n", |
132 | dev_name(dev->parent)); | |
3b98aeaf | 133 | list_add_tail(&dev->power.entry, &dpm_list); |
1a9a9152 | 134 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
135 | } |
136 | ||
775b64d2 | 137 | /** |
20d652d7 RW |
138 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
139 | * @dev: Device to be removed from the list. | |
775b64d2 | 140 | */ |
9cddad77 | 141 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
142 | { |
143 | pr_debug("PM: Removing info for %s:%s\n", | |
5c1a07ab | 144 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
5af84b82 | 145 | complete_all(&dev->power.completion); |
11048dcf | 146 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 147 | list_del_init(&dev->power.entry); |
11048dcf | 148 | mutex_unlock(&dpm_list_mtx); |
074037ec | 149 | device_wakeup_disable(dev); |
5e928f77 | 150 | pm_runtime_remove(dev); |
aa8e54b5 | 151 | device_pm_check_callbacks(dev); |
775b64d2 RW |
152 | } |
153 | ||
ffa6a705 | 154 | /** |
20d652d7 RW |
155 | * device_pm_move_before - Move device in the PM core's list of active devices. |
156 | * @deva: Device to move in dpm_list. | |
157 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
158 | */ |
159 | void device_pm_move_before(struct device *deva, struct device *devb) | |
160 | { | |
161 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
5c1a07ab RW |
162 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
163 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
164 | /* Delete deva from dpm_list and reinsert before devb. */ |
165 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
166 | } | |
167 | ||
168 | /** | |
20d652d7 RW |
169 | * device_pm_move_after - Move device in the PM core's list of active devices. |
170 | * @deva: Device to move in dpm_list. | |
171 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
172 | */ |
173 | void device_pm_move_after(struct device *deva, struct device *devb) | |
174 | { | |
175 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
5c1a07ab RW |
176 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
177 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
178 | /* Delete deva from dpm_list and reinsert after devb. */ |
179 | list_move(&deva->power.entry, &devb->power.entry); | |
180 | } | |
181 | ||
182 | /** | |
20d652d7 RW |
183 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
184 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
185 | */ |
186 | void device_pm_move_last(struct device *dev) | |
187 | { | |
188 | pr_debug("PM: Moving %s:%s to end of list\n", | |
5c1a07ab | 189 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
ffa6a705 CH |
190 | list_move_tail(&dev->power.entry, &dpm_list); |
191 | } | |
192 | ||
875ab0b7 RW |
193 | static ktime_t initcall_debug_start(struct device *dev) |
194 | { | |
195 | ktime_t calltime = ktime_set(0, 0); | |
196 | ||
b2df1d4f | 197 | if (pm_print_times_enabled) { |
0c6aebe3 RW |
198 | pr_info("calling %s+ @ %i, parent: %s\n", |
199 | dev_name(dev), task_pid_nr(current), | |
200 | dev->parent ? dev_name(dev->parent) : "none"); | |
875ab0b7 RW |
201 | calltime = ktime_get(); |
202 | } | |
203 | ||
204 | return calltime; | |
205 | } | |
206 | ||
207 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
53644677 | 208 | int error, pm_message_t state, char *info) |
875ab0b7 | 209 | { |
53644677 SK |
210 | ktime_t rettime; |
211 | s64 nsecs; | |
212 | ||
213 | rettime = ktime_get(); | |
214 | nsecs = (s64) ktime_to_ns(ktime_sub(rettime, calltime)); | |
875ab0b7 | 215 | |
b2df1d4f | 216 | if (pm_print_times_enabled) { |
875ab0b7 | 217 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), |
53644677 | 218 | error, (unsigned long long)nsecs >> 10); |
875ab0b7 RW |
219 | } |
220 | } | |
221 | ||
5af84b82 RW |
222 | /** |
223 | * dpm_wait - Wait for a PM operation to complete. | |
224 | * @dev: Device to wait for. | |
225 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
226 | */ | |
227 | static void dpm_wait(struct device *dev, bool async) | |
228 | { | |
229 | if (!dev) | |
230 | return; | |
231 | ||
0e06b4a8 | 232 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
233 | wait_for_completion(&dev->power.completion); |
234 | } | |
235 | ||
236 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
237 | { | |
238 | dpm_wait(dev, *((bool *)async_ptr)); | |
239 | return 0; | |
240 | } | |
241 | ||
242 | static void dpm_wait_for_children(struct device *dev, bool async) | |
243 | { | |
244 | device_for_each_child(dev, &async, dpm_wait_fn); | |
245 | } | |
246 | ||
1eede070 | 247 | /** |
9cf519d1 | 248 | * pm_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
249 | * @ops: PM operations to choose from. |
250 | * @state: PM transition of the system being carried out. | |
1eede070 | 251 | */ |
9cf519d1 | 252 | static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 253 | { |
1eede070 RW |
254 | switch (state.event) { |
255 | #ifdef CONFIG_SUSPEND | |
256 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 257 | return ops->suspend; |
1eede070 | 258 | case PM_EVENT_RESUME: |
9cf519d1 | 259 | return ops->resume; |
1eede070 | 260 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 261 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
262 | case PM_EVENT_FREEZE: |
263 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 264 | return ops->freeze; |
1eede070 | 265 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 266 | return ops->poweroff; |
1eede070 RW |
267 | case PM_EVENT_THAW: |
268 | case PM_EVENT_RECOVER: | |
9cf519d1 | 269 | return ops->thaw; |
1eede070 RW |
270 | break; |
271 | case PM_EVENT_RESTORE: | |
9cf519d1 | 272 | return ops->restore; |
1f112cee | 273 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 274 | } |
f2511774 | 275 | |
9cf519d1 | 276 | return NULL; |
1eede070 RW |
277 | } |
278 | ||
cf579dfb RW |
279 | /** |
280 | * pm_late_early_op - Return the PM operation appropriate for given PM event. | |
281 | * @ops: PM operations to choose from. | |
282 | * @state: PM transition of the system being carried out. | |
283 | * | |
284 | * Runtime PM is disabled for @dev while this function is being executed. | |
285 | */ | |
286 | static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops, | |
287 | pm_message_t state) | |
288 | { | |
289 | switch (state.event) { | |
290 | #ifdef CONFIG_SUSPEND | |
291 | case PM_EVENT_SUSPEND: | |
292 | return ops->suspend_late; | |
293 | case PM_EVENT_RESUME: | |
294 | return ops->resume_early; | |
295 | #endif /* CONFIG_SUSPEND */ | |
296 | #ifdef CONFIG_HIBERNATE_CALLBACKS | |
297 | case PM_EVENT_FREEZE: | |
298 | case PM_EVENT_QUIESCE: | |
299 | return ops->freeze_late; | |
300 | case PM_EVENT_HIBERNATE: | |
301 | return ops->poweroff_late; | |
302 | case PM_EVENT_THAW: | |
303 | case PM_EVENT_RECOVER: | |
304 | return ops->thaw_early; | |
305 | case PM_EVENT_RESTORE: | |
306 | return ops->restore_early; | |
307 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ | |
308 | } | |
309 | ||
310 | return NULL; | |
311 | } | |
312 | ||
1eede070 | 313 | /** |
9cf519d1 | 314 | * pm_noirq_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
315 | * @ops: PM operations to choose from. |
316 | * @state: PM transition of the system being carried out. | |
1eede070 | 317 | * |
20d652d7 RW |
318 | * The driver of @dev will not receive interrupts while this function is being |
319 | * executed. | |
1eede070 | 320 | */ |
9cf519d1 | 321 | static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 322 | { |
1eede070 RW |
323 | switch (state.event) { |
324 | #ifdef CONFIG_SUSPEND | |
325 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 326 | return ops->suspend_noirq; |
1eede070 | 327 | case PM_EVENT_RESUME: |
9cf519d1 | 328 | return ops->resume_noirq; |
1eede070 | 329 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 330 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
331 | case PM_EVENT_FREEZE: |
332 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 333 | return ops->freeze_noirq; |
1eede070 | 334 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 335 | return ops->poweroff_noirq; |
1eede070 RW |
336 | case PM_EVENT_THAW: |
337 | case PM_EVENT_RECOVER: | |
9cf519d1 | 338 | return ops->thaw_noirq; |
1eede070 | 339 | case PM_EVENT_RESTORE: |
9cf519d1 | 340 | return ops->restore_noirq; |
1f112cee | 341 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 342 | } |
f2511774 | 343 | |
9cf519d1 | 344 | return NULL; |
1eede070 RW |
345 | } |
346 | ||
1eede070 RW |
347 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) |
348 | { | |
349 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
350 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
351 | ", may wakeup" : ""); | |
352 | } | |
353 | ||
354 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
355 | int error) | |
356 | { | |
357 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
5c1a07ab | 358 | dev_name(dev), pm_verb(state.event), info, error); |
1eede070 RW |
359 | } |
360 | ||
ecf762b2 RW |
361 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
362 | { | |
363 | ktime_t calltime; | |
0702d9ee | 364 | u64 usecs64; |
ecf762b2 RW |
365 | int usecs; |
366 | ||
367 | calltime = ktime_get(); | |
368 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
369 | do_div(usecs64, NSEC_PER_USEC); | |
370 | usecs = usecs64; | |
371 | if (usecs == 0) | |
372 | usecs = 1; | |
373 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
374 | info ?: "", info ? " " : "", pm_verb(state.event), | |
375 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
376 | } | |
377 | ||
9cf519d1 RW |
378 | static int dpm_run_callback(pm_callback_t cb, struct device *dev, |
379 | pm_message_t state, char *info) | |
380 | { | |
381 | ktime_t calltime; | |
382 | int error; | |
383 | ||
384 | if (!cb) | |
385 | return 0; | |
386 | ||
387 | calltime = initcall_debug_start(dev); | |
388 | ||
389 | pm_dev_dbg(dev, state, info); | |
e8bca479 | 390 | trace_device_pm_callback_start(dev, info, state.event); |
9cf519d1 | 391 | error = cb(dev); |
e8bca479 | 392 | trace_device_pm_callback_end(dev, error); |
9cf519d1 RW |
393 | suspend_report_result(cb, error); |
394 | ||
53644677 | 395 | initcall_debug_report(dev, calltime, error, state, info); |
9cf519d1 RW |
396 | |
397 | return error; | |
398 | } | |
399 | ||
70fea60d BG |
400 | #ifdef CONFIG_DPM_WATCHDOG |
401 | struct dpm_watchdog { | |
402 | struct device *dev; | |
403 | struct task_struct *tsk; | |
404 | struct timer_list timer; | |
405 | }; | |
406 | ||
407 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \ | |
408 | struct dpm_watchdog wd | |
409 | ||
410 | /** | |
411 | * dpm_watchdog_handler - Driver suspend / resume watchdog handler. | |
412 | * @data: Watchdog object address. | |
413 | * | |
414 | * Called when a driver has timed out suspending or resuming. | |
415 | * There's not much we can do here to recover so panic() to | |
416 | * capture a crash-dump in pstore. | |
417 | */ | |
418 | static void dpm_watchdog_handler(unsigned long data) | |
419 | { | |
420 | struct dpm_watchdog *wd = (void *)data; | |
421 | ||
422 | dev_emerg(wd->dev, "**** DPM device timeout ****\n"); | |
423 | show_stack(wd->tsk, NULL); | |
424 | panic("%s %s: unrecoverable failure\n", | |
425 | dev_driver_string(wd->dev), dev_name(wd->dev)); | |
426 | } | |
427 | ||
428 | /** | |
429 | * dpm_watchdog_set - Enable pm watchdog for given device. | |
430 | * @wd: Watchdog. Must be allocated on the stack. | |
431 | * @dev: Device to handle. | |
432 | */ | |
433 | static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev) | |
434 | { | |
435 | struct timer_list *timer = &wd->timer; | |
436 | ||
437 | wd->dev = dev; | |
438 | wd->tsk = current; | |
439 | ||
440 | init_timer_on_stack(timer); | |
441 | /* use same timeout value for both suspend and resume */ | |
442 | timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT; | |
443 | timer->function = dpm_watchdog_handler; | |
444 | timer->data = (unsigned long)wd; | |
445 | add_timer(timer); | |
446 | } | |
447 | ||
448 | /** | |
449 | * dpm_watchdog_clear - Disable suspend/resume watchdog. | |
450 | * @wd: Watchdog to disable. | |
451 | */ | |
452 | static void dpm_watchdog_clear(struct dpm_watchdog *wd) | |
453 | { | |
454 | struct timer_list *timer = &wd->timer; | |
455 | ||
456 | del_timer_sync(timer); | |
457 | destroy_timer_on_stack(timer); | |
458 | } | |
459 | #else | |
460 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) | |
461 | #define dpm_watchdog_set(x, y) | |
462 | #define dpm_watchdog_clear(x) | |
463 | #endif | |
464 | ||
cd59abfc AS |
465 | /*------------------------- Resume routines -------------------------*/ |
466 | ||
467 | /** | |
20d652d7 RW |
468 | * device_resume_noirq - Execute an "early resume" callback for given device. |
469 | * @dev: Device to handle. | |
470 | * @state: PM transition of the system being carried out. | |
58c256a3 | 471 | * @async: If true, the device is being resumed asynchronously. |
cd59abfc | 472 | * |
20d652d7 RW |
473 | * The driver of @dev will not receive interrupts while this function is being |
474 | * executed. | |
cd59abfc | 475 | */ |
76569faa | 476 | static int device_resume_noirq(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 477 | { |
9cf519d1 RW |
478 | pm_callback_t callback = NULL; |
479 | char *info = NULL; | |
cd59abfc AS |
480 | int error = 0; |
481 | ||
482 | TRACE_DEVICE(dev); | |
483 | TRACE_RESUME(0); | |
484 | ||
aae4518b | 485 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
486 | goto Out; |
487 | ||
3d2699bc LC |
488 | if (!dev->power.is_noirq_suspended) |
489 | goto Out; | |
490 | ||
76569faa LC |
491 | dpm_wait(dev->parent, async); |
492 | ||
564b905a | 493 | if (dev->pm_domain) { |
cf579dfb | 494 | info = "noirq power domain "; |
9cf519d1 | 495 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 496 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 497 | info = "noirq type "; |
9cf519d1 | 498 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 499 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 500 | info = "noirq class "; |
9cf519d1 | 501 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 502 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 503 | info = "noirq bus "; |
9cf519d1 | 504 | callback = pm_noirq_op(dev->bus->pm, state); |
e7176a37 DB |
505 | } |
506 | ||
35cd133c | 507 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 508 | info = "noirq driver "; |
35cd133c RW |
509 | callback = pm_noirq_op(dev->driver->pm, state); |
510 | } | |
511 | ||
9cf519d1 | 512 | error = dpm_run_callback(callback, dev, state, info); |
3d2699bc | 513 | dev->power.is_noirq_suspended = false; |
9cf519d1 | 514 | |
dbf37414 | 515 | Out: |
76569faa | 516 | complete_all(&dev->power.completion); |
775b64d2 RW |
517 | TRACE_RESUME(error); |
518 | return error; | |
519 | } | |
520 | ||
76569faa LC |
521 | static bool is_async(struct device *dev) |
522 | { | |
523 | return dev->power.async_suspend && pm_async_enabled | |
524 | && !pm_trace_is_enabled(); | |
525 | } | |
526 | ||
527 | static void async_resume_noirq(void *data, async_cookie_t cookie) | |
528 | { | |
529 | struct device *dev = (struct device *)data; | |
530 | int error; | |
531 | ||
532 | error = device_resume_noirq(dev, pm_transition, true); | |
533 | if (error) | |
534 | pm_dev_err(dev, pm_transition, " async", error); | |
535 | ||
536 | put_device(dev); | |
537 | } | |
538 | ||
775b64d2 | 539 | /** |
cf579dfb | 540 | * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices. |
20d652d7 | 541 | * @state: PM transition of the system being carried out. |
775b64d2 | 542 | * |
cf579dfb | 543 | * Call the "noirq" resume handlers for all devices in dpm_noirq_list and |
20d652d7 | 544 | * enable device drivers to receive interrupts. |
775b64d2 | 545 | */ |
2a8a8ce6 | 546 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 547 | { |
76569faa | 548 | struct device *dev; |
ecf762b2 | 549 | ktime_t starttime = ktime_get(); |
775b64d2 | 550 | |
bb3632c6 | 551 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, true); |
32bdfac5 | 552 | mutex_lock(&dpm_list_mtx); |
76569faa | 553 | pm_transition = state; |
d08a5ace | 554 | |
76569faa LC |
555 | /* |
556 | * Advanced the async threads upfront, | |
557 | * in case the starting of async threads is | |
558 | * delayed by non-async resuming devices. | |
559 | */ | |
560 | list_for_each_entry(dev, &dpm_noirq_list, power.entry) { | |
561 | reinit_completion(&dev->power.completion); | |
562 | if (is_async(dev)) { | |
563 | get_device(dev); | |
564 | async_schedule(async_resume_noirq, dev); | |
565 | } | |
566 | } | |
567 | ||
568 | while (!list_empty(&dpm_noirq_list)) { | |
569 | dev = to_device(dpm_noirq_list.next); | |
d08a5ace | 570 | get_device(dev); |
cf579dfb | 571 | list_move_tail(&dev->power.entry, &dpm_late_early_list); |
5b219a51 | 572 | mutex_unlock(&dpm_list_mtx); |
d08a5ace | 573 | |
76569faa LC |
574 | if (!is_async(dev)) { |
575 | int error; | |
576 | ||
577 | error = device_resume_noirq(dev, state, false); | |
578 | if (error) { | |
579 | suspend_stats.failed_resume_noirq++; | |
580 | dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); | |
581 | dpm_save_failed_dev(dev_name(dev)); | |
582 | pm_dev_err(dev, state, " noirq", error); | |
583 | } | |
cf579dfb RW |
584 | } |
585 | ||
586 | mutex_lock(&dpm_list_mtx); | |
587 | put_device(dev); | |
588 | } | |
589 | mutex_unlock(&dpm_list_mtx); | |
76569faa | 590 | async_synchronize_full(); |
cf579dfb RW |
591 | dpm_show_time(starttime, state, "noirq"); |
592 | resume_device_irqs(); | |
4990d4fe | 593 | device_wakeup_disarm_wake_irqs(); |
8651f97b | 594 | cpuidle_resume(); |
bb3632c6 | 595 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false); |
cf579dfb RW |
596 | } |
597 | ||
598 | /** | |
599 | * device_resume_early - Execute an "early resume" callback for given device. | |
600 | * @dev: Device to handle. | |
601 | * @state: PM transition of the system being carried out. | |
58c256a3 | 602 | * @async: If true, the device is being resumed asynchronously. |
cf579dfb RW |
603 | * |
604 | * Runtime PM is disabled for @dev while this function is being executed. | |
605 | */ | |
9e5e7910 | 606 | static int device_resume_early(struct device *dev, pm_message_t state, bool async) |
cf579dfb RW |
607 | { |
608 | pm_callback_t callback = NULL; | |
609 | char *info = NULL; | |
610 | int error = 0; | |
611 | ||
612 | TRACE_DEVICE(dev); | |
613 | TRACE_RESUME(0); | |
614 | ||
aae4518b | 615 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
616 | goto Out; |
617 | ||
3d2699bc LC |
618 | if (!dev->power.is_late_suspended) |
619 | goto Out; | |
620 | ||
9e5e7910 LC |
621 | dpm_wait(dev->parent, async); |
622 | ||
cf579dfb RW |
623 | if (dev->pm_domain) { |
624 | info = "early power domain "; | |
625 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
626 | } else if (dev->type && dev->type->pm) { | |
627 | info = "early type "; | |
628 | callback = pm_late_early_op(dev->type->pm, state); | |
629 | } else if (dev->class && dev->class->pm) { | |
630 | info = "early class "; | |
631 | callback = pm_late_early_op(dev->class->pm, state); | |
632 | } else if (dev->bus && dev->bus->pm) { | |
633 | info = "early bus "; | |
634 | callback = pm_late_early_op(dev->bus->pm, state); | |
635 | } | |
636 | ||
637 | if (!callback && dev->driver && dev->driver->pm) { | |
638 | info = "early driver "; | |
639 | callback = pm_late_early_op(dev->driver->pm, state); | |
640 | } | |
641 | ||
642 | error = dpm_run_callback(callback, dev, state, info); | |
3d2699bc | 643 | dev->power.is_late_suspended = false; |
cf579dfb | 644 | |
dbf37414 | 645 | Out: |
cf579dfb | 646 | TRACE_RESUME(error); |
9f6d8f6a RW |
647 | |
648 | pm_runtime_enable(dev); | |
9e5e7910 | 649 | complete_all(&dev->power.completion); |
cf579dfb RW |
650 | return error; |
651 | } | |
652 | ||
9e5e7910 LC |
653 | static void async_resume_early(void *data, async_cookie_t cookie) |
654 | { | |
655 | struct device *dev = (struct device *)data; | |
656 | int error; | |
657 | ||
658 | error = device_resume_early(dev, pm_transition, true); | |
659 | if (error) | |
660 | pm_dev_err(dev, pm_transition, " async", error); | |
661 | ||
662 | put_device(dev); | |
663 | } | |
664 | ||
cf579dfb RW |
665 | /** |
666 | * dpm_resume_early - Execute "early resume" callbacks for all devices. | |
667 | * @state: PM transition of the system being carried out. | |
668 | */ | |
2a8a8ce6 | 669 | void dpm_resume_early(pm_message_t state) |
cf579dfb | 670 | { |
9e5e7910 | 671 | struct device *dev; |
cf579dfb RW |
672 | ktime_t starttime = ktime_get(); |
673 | ||
bb3632c6 | 674 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, true); |
cf579dfb | 675 | mutex_lock(&dpm_list_mtx); |
9e5e7910 LC |
676 | pm_transition = state; |
677 | ||
678 | /* | |
679 | * Advanced the async threads upfront, | |
680 | * in case the starting of async threads is | |
681 | * delayed by non-async resuming devices. | |
682 | */ | |
683 | list_for_each_entry(dev, &dpm_late_early_list, power.entry) { | |
684 | reinit_completion(&dev->power.completion); | |
685 | if (is_async(dev)) { | |
686 | get_device(dev); | |
687 | async_schedule(async_resume_early, dev); | |
688 | } | |
689 | } | |
cf579dfb | 690 | |
9e5e7910 LC |
691 | while (!list_empty(&dpm_late_early_list)) { |
692 | dev = to_device(dpm_late_early_list.next); | |
cf579dfb RW |
693 | get_device(dev); |
694 | list_move_tail(&dev->power.entry, &dpm_suspended_list); | |
695 | mutex_unlock(&dpm_list_mtx); | |
696 | ||
9e5e7910 LC |
697 | if (!is_async(dev)) { |
698 | int error; | |
d08a5ace | 699 | |
9e5e7910 LC |
700 | error = device_resume_early(dev, state, false); |
701 | if (error) { | |
702 | suspend_stats.failed_resume_early++; | |
703 | dpm_save_failed_step(SUSPEND_RESUME_EARLY); | |
704 | dpm_save_failed_dev(dev_name(dev)); | |
705 | pm_dev_err(dev, state, " early", error); | |
706 | } | |
707 | } | |
5b219a51 | 708 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
709 | put_device(dev); |
710 | } | |
32bdfac5 | 711 | mutex_unlock(&dpm_list_mtx); |
9e5e7910 | 712 | async_synchronize_full(); |
ecf762b2 | 713 | dpm_show_time(starttime, state, "early"); |
bb3632c6 | 714 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, false); |
775b64d2 | 715 | } |
cf579dfb RW |
716 | |
717 | /** | |
718 | * dpm_resume_start - Execute "noirq" and "early" device callbacks. | |
719 | * @state: PM transition of the system being carried out. | |
720 | */ | |
721 | void dpm_resume_start(pm_message_t state) | |
722 | { | |
723 | dpm_resume_noirq(state); | |
724 | dpm_resume_early(state); | |
725 | } | |
726 | EXPORT_SYMBOL_GPL(dpm_resume_start); | |
775b64d2 RW |
727 | |
728 | /** | |
97df8c12 | 729 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
730 | * @dev: Device to handle. |
731 | * @state: PM transition of the system being carried out. | |
5af84b82 | 732 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 733 | */ |
97df8c12 | 734 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 735 | { |
9cf519d1 RW |
736 | pm_callback_t callback = NULL; |
737 | char *info = NULL; | |
775b64d2 | 738 | int error = 0; |
70fea60d | 739 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
775b64d2 RW |
740 | |
741 | TRACE_DEVICE(dev); | |
742 | TRACE_RESUME(0); | |
cd59abfc | 743 | |
dbf37414 RW |
744 | if (dev->power.syscore) |
745 | goto Complete; | |
746 | ||
aae4518b RW |
747 | if (dev->power.direct_complete) { |
748 | /* Match the pm_runtime_disable() in __device_suspend(). */ | |
749 | pm_runtime_enable(dev); | |
750 | goto Complete; | |
751 | } | |
752 | ||
5af84b82 | 753 | dpm_wait(dev->parent, async); |
70fea60d | 754 | dpm_watchdog_set(&wd, dev); |
8e9394ce | 755 | device_lock(dev); |
7a8d37a3 | 756 | |
f76b168b AS |
757 | /* |
758 | * This is a fib. But we'll allow new children to be added below | |
759 | * a resumed device, even if the device hasn't been completed yet. | |
760 | */ | |
761 | dev->power.is_prepared = false; | |
97df8c12 | 762 | |
6d0e0e84 AS |
763 | if (!dev->power.is_suspended) |
764 | goto Unlock; | |
765 | ||
564b905a | 766 | if (dev->pm_domain) { |
9cf519d1 RW |
767 | info = "power domain "; |
768 | callback = pm_op(&dev->pm_domain->ops, state); | |
35cd133c | 769 | goto Driver; |
7538e3db RW |
770 | } |
771 | ||
9659cc06 | 772 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
773 | info = "type "; |
774 | callback = pm_op(dev->type->pm, state); | |
35cd133c | 775 | goto Driver; |
cd59abfc AS |
776 | } |
777 | ||
1eede070 RW |
778 | if (dev->class) { |
779 | if (dev->class->pm) { | |
9cf519d1 RW |
780 | info = "class "; |
781 | callback = pm_op(dev->class->pm, state); | |
35cd133c | 782 | goto Driver; |
1eede070 | 783 | } else if (dev->class->resume) { |
9cf519d1 RW |
784 | info = "legacy class "; |
785 | callback = dev->class->resume; | |
9659cc06 | 786 | goto End; |
1eede070 | 787 | } |
cd59abfc | 788 | } |
9659cc06 RW |
789 | |
790 | if (dev->bus) { | |
791 | if (dev->bus->pm) { | |
35cd133c | 792 | info = "bus "; |
9cf519d1 | 793 | callback = pm_op(dev->bus->pm, state); |
9659cc06 | 794 | } else if (dev->bus->resume) { |
35cd133c | 795 | info = "legacy bus "; |
9cf519d1 | 796 | callback = dev->bus->resume; |
35cd133c | 797 | goto End; |
9659cc06 RW |
798 | } |
799 | } | |
800 | ||
35cd133c RW |
801 | Driver: |
802 | if (!callback && dev->driver && dev->driver->pm) { | |
803 | info = "driver "; | |
804 | callback = pm_op(dev->driver->pm, state); | |
805 | } | |
806 | ||
1eede070 | 807 | End: |
9cf519d1 | 808 | error = dpm_run_callback(callback, dev, state, info); |
6d0e0e84 AS |
809 | dev->power.is_suspended = false; |
810 | ||
811 | Unlock: | |
8e9394ce | 812 | device_unlock(dev); |
70fea60d | 813 | dpm_watchdog_clear(&wd); |
dbf37414 RW |
814 | |
815 | Complete: | |
5af84b82 | 816 | complete_all(&dev->power.completion); |
7a8d37a3 | 817 | |
cd59abfc | 818 | TRACE_RESUME(error); |
1e2ef05b | 819 | |
cd59abfc AS |
820 | return error; |
821 | } | |
822 | ||
5af84b82 RW |
823 | static void async_resume(void *data, async_cookie_t cookie) |
824 | { | |
825 | struct device *dev = (struct device *)data; | |
826 | int error; | |
827 | ||
97df8c12 | 828 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
829 | if (error) |
830 | pm_dev_err(dev, pm_transition, " async", error); | |
831 | put_device(dev); | |
832 | } | |
833 | ||
775b64d2 | 834 | /** |
20d652d7 RW |
835 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
836 | * @state: PM transition of the system being carried out. | |
775b64d2 | 837 | * |
20d652d7 RW |
838 | * Execute the appropriate "resume" callback for all devices whose status |
839 | * indicates that they are suspended. | |
1eede070 | 840 | */ |
91e7c75b | 841 | void dpm_resume(pm_message_t state) |
1eede070 | 842 | { |
97df8c12 | 843 | struct device *dev; |
ecf762b2 | 844 | ktime_t starttime = ktime_get(); |
1eede070 | 845 | |
bb3632c6 | 846 | trace_suspend_resume(TPS("dpm_resume"), state.event, true); |
91e7c75b RW |
847 | might_sleep(); |
848 | ||
1eede070 | 849 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 850 | pm_transition = state; |
098dff73 | 851 | async_error = 0; |
1eede070 | 852 | |
8a43a9ab | 853 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
16735d02 | 854 | reinit_completion(&dev->power.completion); |
97df8c12 RW |
855 | if (is_async(dev)) { |
856 | get_device(dev); | |
857 | async_schedule(async_resume, dev); | |
858 | } | |
859 | } | |
860 | ||
8a43a9ab RW |
861 | while (!list_empty(&dpm_suspended_list)) { |
862 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 863 | get_device(dev); |
5b219a51 | 864 | if (!is_async(dev)) { |
1eede070 RW |
865 | int error; |
866 | ||
1eede070 RW |
867 | mutex_unlock(&dpm_list_mtx); |
868 | ||
97df8c12 | 869 | error = device_resume(dev, state, false); |
2a77c46d SL |
870 | if (error) { |
871 | suspend_stats.failed_resume++; | |
872 | dpm_save_failed_step(SUSPEND_RESUME); | |
873 | dpm_save_failed_dev(dev_name(dev)); | |
1eede070 | 874 | pm_dev_err(dev, state, "", error); |
2a77c46d | 875 | } |
5b219a51 RW |
876 | |
877 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
878 | } |
879 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 880 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
881 | put_device(dev); |
882 | } | |
1eede070 | 883 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 884 | async_synchronize_full(); |
ecf762b2 | 885 | dpm_show_time(starttime, state, NULL); |
2f0aea93 VK |
886 | |
887 | cpufreq_resume(); | |
bb3632c6 | 888 | trace_suspend_resume(TPS("dpm_resume"), state.event, false); |
1eede070 RW |
889 | } |
890 | ||
891 | /** | |
20d652d7 RW |
892 | * device_complete - Complete a PM transition for given device. |
893 | * @dev: Device to handle. | |
894 | * @state: PM transition of the system being carried out. | |
1eede070 | 895 | */ |
d1616302 | 896 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 897 | { |
35cd133c RW |
898 | void (*callback)(struct device *) = NULL; |
899 | char *info = NULL; | |
900 | ||
dbf37414 RW |
901 | if (dev->power.syscore) |
902 | return; | |
903 | ||
8e9394ce | 904 | device_lock(dev); |
1eede070 | 905 | |
564b905a | 906 | if (dev->pm_domain) { |
35cd133c RW |
907 | info = "completing power domain "; |
908 | callback = dev->pm_domain->ops.complete; | |
4d27e9dc | 909 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
910 | info = "completing type "; |
911 | callback = dev->type->pm->complete; | |
9659cc06 | 912 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
913 | info = "completing class "; |
914 | callback = dev->class->pm->complete; | |
9659cc06 | 915 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
916 | info = "completing bus "; |
917 | callback = dev->bus->pm->complete; | |
918 | } | |
919 | ||
920 | if (!callback && dev->driver && dev->driver->pm) { | |
921 | info = "completing driver "; | |
922 | callback = dev->driver->pm->complete; | |
923 | } | |
924 | ||
925 | if (callback) { | |
926 | pm_dev_dbg(dev, state, info); | |
927 | callback(dev); | |
1eede070 RW |
928 | } |
929 | ||
8e9394ce | 930 | device_unlock(dev); |
88d26136 | 931 | |
af939339 | 932 | pm_runtime_put(dev); |
1eede070 RW |
933 | } |
934 | ||
935 | /** | |
20d652d7 RW |
936 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
937 | * @state: PM transition of the system being carried out. | |
775b64d2 | 938 | * |
20d652d7 RW |
939 | * Execute the ->complete() callbacks for all devices whose PM status is not |
940 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 941 | */ |
91e7c75b | 942 | void dpm_complete(pm_message_t state) |
cd59abfc | 943 | { |
1eede070 RW |
944 | struct list_head list; |
945 | ||
bb3632c6 | 946 | trace_suspend_resume(TPS("dpm_complete"), state.event, true); |
91e7c75b RW |
947 | might_sleep(); |
948 | ||
1eede070 | 949 | INIT_LIST_HEAD(&list); |
cd59abfc | 950 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
951 | while (!list_empty(&dpm_prepared_list)) { |
952 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 953 | |
1eede070 | 954 | get_device(dev); |
f76b168b | 955 | dev->power.is_prepared = false; |
5b219a51 RW |
956 | list_move(&dev->power.entry, &list); |
957 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 958 | |
32e8d689 | 959 | trace_device_pm_callback_start(dev, "", state.event); |
5b219a51 | 960 | device_complete(dev, state); |
32e8d689 | 961 | trace_device_pm_callback_end(dev, 0); |
1eede070 | 962 | |
5b219a51 | 963 | mutex_lock(&dpm_list_mtx); |
1eede070 | 964 | put_device(dev); |
cd59abfc | 965 | } |
1eede070 | 966 | list_splice(&list, &dpm_list); |
cd59abfc | 967 | mutex_unlock(&dpm_list_mtx); |
013c074f SG |
968 | |
969 | /* Allow device probing and trigger re-probing of deferred devices */ | |
970 | device_unblock_probing(); | |
bb3632c6 | 971 | trace_suspend_resume(TPS("dpm_complete"), state.event, false); |
cd59abfc AS |
972 | } |
973 | ||
cd59abfc | 974 | /** |
20d652d7 RW |
975 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
976 | * @state: PM transition of the system being carried out. | |
cd59abfc | 977 | * |
20d652d7 RW |
978 | * Execute "resume" callbacks for all devices and complete the PM transition of |
979 | * the system. | |
cd59abfc | 980 | */ |
d1616302 | 981 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 982 | { |
1eede070 RW |
983 | dpm_resume(state); |
984 | dpm_complete(state); | |
cd59abfc | 985 | } |
d1616302 | 986 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
987 | |
988 | ||
989 | /*------------------------- Suspend routines -------------------------*/ | |
990 | ||
1eede070 | 991 | /** |
20d652d7 RW |
992 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
993 | * @sleep_state: PM message representing a sleep state. | |
994 | * | |
995 | * Return a PM message representing the resume event corresponding to given | |
996 | * sleep state. | |
1eede070 RW |
997 | */ |
998 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 999 | { |
1eede070 RW |
1000 | switch (sleep_state.event) { |
1001 | case PM_EVENT_SUSPEND: | |
1002 | return PMSG_RESUME; | |
1003 | case PM_EVENT_FREEZE: | |
1004 | case PM_EVENT_QUIESCE: | |
1005 | return PMSG_RECOVER; | |
1006 | case PM_EVENT_HIBERNATE: | |
1007 | return PMSG_RESTORE; | |
cd59abfc | 1008 | } |
1eede070 | 1009 | return PMSG_ON; |
cd59abfc AS |
1010 | } |
1011 | ||
1012 | /** | |
20d652d7 RW |
1013 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
1014 | * @dev: Device to handle. | |
1015 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1016 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1017 | * |
20d652d7 RW |
1018 | * The driver of @dev will not receive interrupts while this function is being |
1019 | * executed. | |
cd59abfc | 1020 | */ |
28b6fd6e | 1021 | static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 1022 | { |
9cf519d1 RW |
1023 | pm_callback_t callback = NULL; |
1024 | char *info = NULL; | |
28b6fd6e LC |
1025 | int error = 0; |
1026 | ||
431d452a ZF |
1027 | TRACE_DEVICE(dev); |
1028 | TRACE_SUSPEND(0); | |
1029 | ||
28b6fd6e LC |
1030 | if (async_error) |
1031 | goto Complete; | |
1032 | ||
1033 | if (pm_wakeup_pending()) { | |
1034 | async_error = -EBUSY; | |
1035 | goto Complete; | |
1036 | } | |
e7176a37 | 1037 | |
aae4518b | 1038 | if (dev->power.syscore || dev->power.direct_complete) |
28b6fd6e LC |
1039 | goto Complete; |
1040 | ||
1041 | dpm_wait_for_children(dev, async); | |
dbf37414 | 1042 | |
564b905a | 1043 | if (dev->pm_domain) { |
cf579dfb | 1044 | info = "noirq power domain "; |
9cf519d1 | 1045 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 1046 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 1047 | info = "noirq type "; |
9cf519d1 | 1048 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 1049 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 1050 | info = "noirq class "; |
9cf519d1 | 1051 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 1052 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 1053 | info = "noirq bus "; |
9cf519d1 | 1054 | callback = pm_noirq_op(dev->bus->pm, state); |
7538e3db RW |
1055 | } |
1056 | ||
35cd133c | 1057 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 1058 | info = "noirq driver "; |
35cd133c RW |
1059 | callback = pm_noirq_op(dev->driver->pm, state); |
1060 | } | |
1061 | ||
3d2699bc LC |
1062 | error = dpm_run_callback(callback, dev, state, info); |
1063 | if (!error) | |
1064 | dev->power.is_noirq_suspended = true; | |
28b6fd6e LC |
1065 | else |
1066 | async_error = error; | |
3d2699bc | 1067 | |
28b6fd6e LC |
1068 | Complete: |
1069 | complete_all(&dev->power.completion); | |
431d452a | 1070 | TRACE_SUSPEND(error); |
3d2699bc | 1071 | return error; |
775b64d2 RW |
1072 | } |
1073 | ||
28b6fd6e LC |
1074 | static void async_suspend_noirq(void *data, async_cookie_t cookie) |
1075 | { | |
1076 | struct device *dev = (struct device *)data; | |
1077 | int error; | |
1078 | ||
1079 | error = __device_suspend_noirq(dev, pm_transition, true); | |
1080 | if (error) { | |
1081 | dpm_save_failed_dev(dev_name(dev)); | |
1082 | pm_dev_err(dev, pm_transition, " async", error); | |
1083 | } | |
1084 | ||
1085 | put_device(dev); | |
1086 | } | |
1087 | ||
1088 | static int device_suspend_noirq(struct device *dev) | |
1089 | { | |
1090 | reinit_completion(&dev->power.completion); | |
1091 | ||
431d452a | 1092 | if (is_async(dev)) { |
28b6fd6e LC |
1093 | get_device(dev); |
1094 | async_schedule(async_suspend_noirq, dev); | |
1095 | return 0; | |
1096 | } | |
1097 | return __device_suspend_noirq(dev, pm_transition, false); | |
1098 | } | |
1099 | ||
775b64d2 | 1100 | /** |
cf579dfb | 1101 | * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices. |
20d652d7 | 1102 | * @state: PM transition of the system being carried out. |
775b64d2 | 1103 | * |
20d652d7 RW |
1104 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
1105 | * handlers for all non-sysdev devices. | |
775b64d2 | 1106 | */ |
2a8a8ce6 | 1107 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 1108 | { |
ecf762b2 | 1109 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
1110 | int error = 0; |
1111 | ||
bb3632c6 | 1112 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true); |
8651f97b | 1113 | cpuidle_pause(); |
4990d4fe | 1114 | device_wakeup_arm_wake_irqs(); |
2ed8d2b3 | 1115 | suspend_device_irqs(); |
32bdfac5 | 1116 | mutex_lock(&dpm_list_mtx); |
28b6fd6e LC |
1117 | pm_transition = state; |
1118 | async_error = 0; | |
1119 | ||
cf579dfb RW |
1120 | while (!list_empty(&dpm_late_early_list)) { |
1121 | struct device *dev = to_device(dpm_late_early_list.prev); | |
d08a5ace RW |
1122 | |
1123 | get_device(dev); | |
1124 | mutex_unlock(&dpm_list_mtx); | |
1125 | ||
28b6fd6e | 1126 | error = device_suspend_noirq(dev); |
d08a5ace RW |
1127 | |
1128 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 1129 | if (error) { |
cf579dfb | 1130 | pm_dev_err(dev, state, " noirq", error); |
2a77c46d | 1131 | dpm_save_failed_dev(dev_name(dev)); |
d08a5ace | 1132 | put_device(dev); |
775b64d2 RW |
1133 | break; |
1134 | } | |
d08a5ace | 1135 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1136 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 1137 | put_device(dev); |
52d136cc | 1138 | |
28b6fd6e | 1139 | if (async_error) |
52d136cc | 1140 | break; |
775b64d2 | 1141 | } |
32bdfac5 | 1142 | mutex_unlock(&dpm_list_mtx); |
28b6fd6e LC |
1143 | async_synchronize_full(); |
1144 | if (!error) | |
1145 | error = async_error; | |
1146 | ||
1147 | if (error) { | |
1148 | suspend_stats.failed_suspend_noirq++; | |
1149 | dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); | |
d1616302 | 1150 | dpm_resume_noirq(resume_event(state)); |
28b6fd6e | 1151 | } else { |
cf579dfb | 1152 | dpm_show_time(starttime, state, "noirq"); |
28b6fd6e | 1153 | } |
bb3632c6 | 1154 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false); |
cf579dfb RW |
1155 | return error; |
1156 | } | |
1157 | ||
1158 | /** | |
1159 | * device_suspend_late - Execute a "late suspend" callback for given device. | |
1160 | * @dev: Device to handle. | |
1161 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1162 | * @async: If true, the device is being suspended asynchronously. |
cf579dfb RW |
1163 | * |
1164 | * Runtime PM is disabled for @dev while this function is being executed. | |
1165 | */ | |
de377b39 | 1166 | static int __device_suspend_late(struct device *dev, pm_message_t state, bool async) |
cf579dfb RW |
1167 | { |
1168 | pm_callback_t callback = NULL; | |
1169 | char *info = NULL; | |
de377b39 | 1170 | int error = 0; |
cf579dfb | 1171 | |
431d452a ZF |
1172 | TRACE_DEVICE(dev); |
1173 | TRACE_SUSPEND(0); | |
1174 | ||
9f6d8f6a RW |
1175 | __pm_runtime_disable(dev, false); |
1176 | ||
de377b39 LC |
1177 | if (async_error) |
1178 | goto Complete; | |
1179 | ||
1180 | if (pm_wakeup_pending()) { | |
1181 | async_error = -EBUSY; | |
1182 | goto Complete; | |
1183 | } | |
1184 | ||
aae4518b | 1185 | if (dev->power.syscore || dev->power.direct_complete) |
de377b39 LC |
1186 | goto Complete; |
1187 | ||
1188 | dpm_wait_for_children(dev, async); | |
dbf37414 | 1189 | |
cf579dfb RW |
1190 | if (dev->pm_domain) { |
1191 | info = "late power domain "; | |
1192 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
1193 | } else if (dev->type && dev->type->pm) { | |
1194 | info = "late type "; | |
1195 | callback = pm_late_early_op(dev->type->pm, state); | |
1196 | } else if (dev->class && dev->class->pm) { | |
1197 | info = "late class "; | |
1198 | callback = pm_late_early_op(dev->class->pm, state); | |
1199 | } else if (dev->bus && dev->bus->pm) { | |
1200 | info = "late bus "; | |
1201 | callback = pm_late_early_op(dev->bus->pm, state); | |
1202 | } | |
1203 | ||
1204 | if (!callback && dev->driver && dev->driver->pm) { | |
1205 | info = "late driver "; | |
1206 | callback = pm_late_early_op(dev->driver->pm, state); | |
1207 | } | |
1208 | ||
3d2699bc LC |
1209 | error = dpm_run_callback(callback, dev, state, info); |
1210 | if (!error) | |
1211 | dev->power.is_late_suspended = true; | |
de377b39 LC |
1212 | else |
1213 | async_error = error; | |
3d2699bc | 1214 | |
de377b39 | 1215 | Complete: |
431d452a | 1216 | TRACE_SUSPEND(error); |
de377b39 | 1217 | complete_all(&dev->power.completion); |
3d2699bc | 1218 | return error; |
cf579dfb RW |
1219 | } |
1220 | ||
de377b39 LC |
1221 | static void async_suspend_late(void *data, async_cookie_t cookie) |
1222 | { | |
1223 | struct device *dev = (struct device *)data; | |
1224 | int error; | |
1225 | ||
1226 | error = __device_suspend_late(dev, pm_transition, true); | |
1227 | if (error) { | |
1228 | dpm_save_failed_dev(dev_name(dev)); | |
1229 | pm_dev_err(dev, pm_transition, " async", error); | |
1230 | } | |
1231 | put_device(dev); | |
1232 | } | |
1233 | ||
1234 | static int device_suspend_late(struct device *dev) | |
1235 | { | |
1236 | reinit_completion(&dev->power.completion); | |
1237 | ||
431d452a | 1238 | if (is_async(dev)) { |
de377b39 LC |
1239 | get_device(dev); |
1240 | async_schedule(async_suspend_late, dev); | |
1241 | return 0; | |
1242 | } | |
1243 | ||
1244 | return __device_suspend_late(dev, pm_transition, false); | |
1245 | } | |
1246 | ||
cf579dfb RW |
1247 | /** |
1248 | * dpm_suspend_late - Execute "late suspend" callbacks for all devices. | |
1249 | * @state: PM transition of the system being carried out. | |
1250 | */ | |
2a8a8ce6 | 1251 | int dpm_suspend_late(pm_message_t state) |
cf579dfb RW |
1252 | { |
1253 | ktime_t starttime = ktime_get(); | |
1254 | int error = 0; | |
1255 | ||
bb3632c6 | 1256 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, true); |
cf579dfb | 1257 | mutex_lock(&dpm_list_mtx); |
de377b39 LC |
1258 | pm_transition = state; |
1259 | async_error = 0; | |
1260 | ||
cf579dfb RW |
1261 | while (!list_empty(&dpm_suspended_list)) { |
1262 | struct device *dev = to_device(dpm_suspended_list.prev); | |
1263 | ||
1264 | get_device(dev); | |
1265 | mutex_unlock(&dpm_list_mtx); | |
1266 | ||
de377b39 | 1267 | error = device_suspend_late(dev); |
cf579dfb RW |
1268 | |
1269 | mutex_lock(&dpm_list_mtx); | |
3a17fb32 RW |
1270 | if (!list_empty(&dev->power.entry)) |
1271 | list_move(&dev->power.entry, &dpm_late_early_list); | |
1272 | ||
cf579dfb RW |
1273 | if (error) { |
1274 | pm_dev_err(dev, state, " late", error); | |
cf579dfb RW |
1275 | dpm_save_failed_dev(dev_name(dev)); |
1276 | put_device(dev); | |
1277 | break; | |
1278 | } | |
cf579dfb | 1279 | put_device(dev); |
52d136cc | 1280 | |
de377b39 | 1281 | if (async_error) |
52d136cc | 1282 | break; |
cf579dfb RW |
1283 | } |
1284 | mutex_unlock(&dpm_list_mtx); | |
de377b39 | 1285 | async_synchronize_full(); |
246ef766 ID |
1286 | if (!error) |
1287 | error = async_error; | |
de377b39 LC |
1288 | if (error) { |
1289 | suspend_stats.failed_suspend_late++; | |
1290 | dpm_save_failed_step(SUSPEND_SUSPEND_LATE); | |
cf579dfb | 1291 | dpm_resume_early(resume_event(state)); |
de377b39 | 1292 | } else { |
ecf762b2 | 1293 | dpm_show_time(starttime, state, "late"); |
de377b39 | 1294 | } |
bb3632c6 | 1295 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false); |
775b64d2 RW |
1296 | return error; |
1297 | } | |
cf579dfb RW |
1298 | |
1299 | /** | |
1300 | * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks. | |
1301 | * @state: PM transition of the system being carried out. | |
1302 | */ | |
1303 | int dpm_suspend_end(pm_message_t state) | |
1304 | { | |
1305 | int error = dpm_suspend_late(state); | |
064b021f CC |
1306 | if (error) |
1307 | return error; | |
1308 | ||
1309 | error = dpm_suspend_noirq(state); | |
1310 | if (error) { | |
997a0311 | 1311 | dpm_resume_early(resume_event(state)); |
064b021f CC |
1312 | return error; |
1313 | } | |
cf579dfb | 1314 | |
064b021f | 1315 | return 0; |
cf579dfb RW |
1316 | } |
1317 | EXPORT_SYMBOL_GPL(dpm_suspend_end); | |
775b64d2 | 1318 | |
875ab0b7 RW |
1319 | /** |
1320 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
1321 | * @dev: Device to suspend. |
1322 | * @state: PM transition of the system being carried out. | |
1323 | * @cb: Suspend callback to execute. | |
58c256a3 | 1324 | * @info: string description of caller. |
875ab0b7 RW |
1325 | */ |
1326 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
53644677 SK |
1327 | int (*cb)(struct device *dev, pm_message_t state), |
1328 | char *info) | |
875ab0b7 RW |
1329 | { |
1330 | int error; | |
1331 | ktime_t calltime; | |
1332 | ||
1333 | calltime = initcall_debug_start(dev); | |
1334 | ||
e8bca479 | 1335 | trace_device_pm_callback_start(dev, info, state.event); |
875ab0b7 | 1336 | error = cb(dev, state); |
e8bca479 | 1337 | trace_device_pm_callback_end(dev, error); |
875ab0b7 RW |
1338 | suspend_report_result(cb, error); |
1339 | ||
53644677 | 1340 | initcall_debug_report(dev, calltime, error, state, info); |
875ab0b7 RW |
1341 | |
1342 | return error; | |
1343 | } | |
1344 | ||
775b64d2 | 1345 | /** |
20d652d7 RW |
1346 | * device_suspend - Execute "suspend" callbacks for given device. |
1347 | * @dev: Device to handle. | |
1348 | * @state: PM transition of the system being carried out. | |
5af84b82 | 1349 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1350 | */ |
5af84b82 | 1351 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 1352 | { |
9cf519d1 RW |
1353 | pm_callback_t callback = NULL; |
1354 | char *info = NULL; | |
cd59abfc | 1355 | int error = 0; |
70fea60d | 1356 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
cd59abfc | 1357 | |
431d452a ZF |
1358 | TRACE_DEVICE(dev); |
1359 | TRACE_SUSPEND(0); | |
1360 | ||
5af84b82 | 1361 | dpm_wait_for_children(dev, async); |
7a8d37a3 | 1362 | |
5af84b82 | 1363 | if (async_error) |
1f758b23 | 1364 | goto Complete; |
1e2ef05b | 1365 | |
88d26136 AS |
1366 | /* |
1367 | * If a device configured to wake up the system from sleep states | |
1368 | * has been suspended at run time and there's a resume request pending | |
1369 | * for it, this is equivalent to the device signaling wakeup, so the | |
1370 | * system suspend operation should be aborted. | |
1371 | */ | |
1e2ef05b RW |
1372 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1373 | pm_wakeup_event(dev, 0); | |
5af84b82 | 1374 | |
d83f905e RW |
1375 | if (pm_wakeup_pending()) { |
1376 | async_error = -EBUSY; | |
1f758b23 | 1377 | goto Complete; |
d83f905e RW |
1378 | } |
1379 | ||
dbf37414 RW |
1380 | if (dev->power.syscore) |
1381 | goto Complete; | |
1382 | ||
aae4518b RW |
1383 | if (dev->power.direct_complete) { |
1384 | if (pm_runtime_status_suspended(dev)) { | |
1385 | pm_runtime_disable(dev); | |
019d8817 | 1386 | if (pm_runtime_status_suspended(dev)) |
aae4518b RW |
1387 | goto Complete; |
1388 | ||
1389 | pm_runtime_enable(dev); | |
1390 | } | |
1391 | dev->power.direct_complete = false; | |
1392 | } | |
1393 | ||
70fea60d | 1394 | dpm_watchdog_set(&wd, dev); |
1e2ef05b RW |
1395 | device_lock(dev); |
1396 | ||
564b905a | 1397 | if (dev->pm_domain) { |
9cf519d1 RW |
1398 | info = "power domain "; |
1399 | callback = pm_op(&dev->pm_domain->ops, state); | |
1400 | goto Run; | |
4d27e9dc RW |
1401 | } |
1402 | ||
9659cc06 | 1403 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
1404 | info = "type "; |
1405 | callback = pm_op(dev->type->pm, state); | |
1406 | goto Run; | |
9659cc06 RW |
1407 | } |
1408 | ||
1eede070 RW |
1409 | if (dev->class) { |
1410 | if (dev->class->pm) { | |
9cf519d1 RW |
1411 | info = "class "; |
1412 | callback = pm_op(dev->class->pm, state); | |
1413 | goto Run; | |
1eede070 RW |
1414 | } else if (dev->class->suspend) { |
1415 | pm_dev_dbg(dev, state, "legacy class "); | |
53644677 SK |
1416 | error = legacy_suspend(dev, state, dev->class->suspend, |
1417 | "legacy class "); | |
4d27e9dc | 1418 | goto End; |
1eede070 | 1419 | } |
cd59abfc AS |
1420 | } |
1421 | ||
1eede070 RW |
1422 | if (dev->bus) { |
1423 | if (dev->bus->pm) { | |
35cd133c | 1424 | info = "bus "; |
9cf519d1 | 1425 | callback = pm_op(dev->bus->pm, state); |
1eede070 | 1426 | } else if (dev->bus->suspend) { |
35cd133c | 1427 | pm_dev_dbg(dev, state, "legacy bus "); |
53644677 SK |
1428 | error = legacy_suspend(dev, state, dev->bus->suspend, |
1429 | "legacy bus "); | |
9cf519d1 | 1430 | goto End; |
1eede070 | 1431 | } |
7538e3db RW |
1432 | } |
1433 | ||
9cf519d1 | 1434 | Run: |
35cd133c RW |
1435 | if (!callback && dev->driver && dev->driver->pm) { |
1436 | info = "driver "; | |
1437 | callback = pm_op(dev->driver->pm, state); | |
1438 | } | |
1439 | ||
9cf519d1 RW |
1440 | error = dpm_run_callback(callback, dev, state, info); |
1441 | ||
1eede070 | 1442 | End: |
4ca46ff3 | 1443 | if (!error) { |
aae4518b RW |
1444 | struct device *parent = dev->parent; |
1445 | ||
4ca46ff3 | 1446 | dev->power.is_suspended = true; |
aae4518b RW |
1447 | if (parent) { |
1448 | spin_lock_irq(&parent->power.lock); | |
1449 | ||
1450 | dev->parent->power.direct_complete = false; | |
1451 | if (dev->power.wakeup_path | |
1452 | && !dev->parent->power.ignore_children) | |
1453 | dev->parent->power.wakeup_path = true; | |
1454 | ||
1455 | spin_unlock_irq(&parent->power.lock); | |
1456 | } | |
4ca46ff3 | 1457 | } |
6d0e0e84 | 1458 | |
8e9394ce | 1459 | device_unlock(dev); |
70fea60d | 1460 | dpm_watchdog_clear(&wd); |
1f758b23 MSB |
1461 | |
1462 | Complete: | |
5af84b82 | 1463 | complete_all(&dev->power.completion); |
88d26136 | 1464 | if (error) |
098dff73 RW |
1465 | async_error = error; |
1466 | ||
431d452a | 1467 | TRACE_SUSPEND(error); |
cd59abfc AS |
1468 | return error; |
1469 | } | |
1470 | ||
5af84b82 RW |
1471 | static void async_suspend(void *data, async_cookie_t cookie) |
1472 | { | |
1473 | struct device *dev = (struct device *)data; | |
1474 | int error; | |
1475 | ||
1476 | error = __device_suspend(dev, pm_transition, true); | |
2a77c46d SL |
1477 | if (error) { |
1478 | dpm_save_failed_dev(dev_name(dev)); | |
5af84b82 | 1479 | pm_dev_err(dev, pm_transition, " async", error); |
2a77c46d | 1480 | } |
5af84b82 RW |
1481 | |
1482 | put_device(dev); | |
1483 | } | |
1484 | ||
1485 | static int device_suspend(struct device *dev) | |
1486 | { | |
16735d02 | 1487 | reinit_completion(&dev->power.completion); |
5af84b82 | 1488 | |
431d452a | 1489 | if (is_async(dev)) { |
5af84b82 RW |
1490 | get_device(dev); |
1491 | async_schedule(async_suspend, dev); | |
1492 | return 0; | |
1493 | } | |
1494 | ||
1495 | return __device_suspend(dev, pm_transition, false); | |
1496 | } | |
1497 | ||
cd59abfc | 1498 | /** |
20d652d7 RW |
1499 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
1500 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1501 | */ |
91e7c75b | 1502 | int dpm_suspend(pm_message_t state) |
cd59abfc | 1503 | { |
ecf762b2 | 1504 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
1505 | int error = 0; |
1506 | ||
bb3632c6 | 1507 | trace_suspend_resume(TPS("dpm_suspend"), state.event, true); |
91e7c75b RW |
1508 | might_sleep(); |
1509 | ||
2f0aea93 VK |
1510 | cpufreq_suspend(); |
1511 | ||
cd59abfc | 1512 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
1513 | pm_transition = state; |
1514 | async_error = 0; | |
8a43a9ab RW |
1515 | while (!list_empty(&dpm_prepared_list)) { |
1516 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 1517 | |
1eede070 | 1518 | get_device(dev); |
cd59abfc | 1519 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 1520 | |
5af84b82 | 1521 | error = device_suspend(dev); |
1eede070 | 1522 | |
1b3cbec1 | 1523 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 1524 | if (error) { |
1eede070 | 1525 | pm_dev_err(dev, state, "", error); |
2a77c46d | 1526 | dpm_save_failed_dev(dev_name(dev)); |
1eede070 | 1527 | put_device(dev); |
775b64d2 RW |
1528 | break; |
1529 | } | |
7a8d37a3 | 1530 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1531 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 1532 | put_device(dev); |
5af84b82 RW |
1533 | if (async_error) |
1534 | break; | |
cd59abfc AS |
1535 | } |
1536 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
1537 | async_synchronize_full(); |
1538 | if (!error) | |
1539 | error = async_error; | |
2a77c46d SL |
1540 | if (error) { |
1541 | suspend_stats.failed_suspend++; | |
1542 | dpm_save_failed_step(SUSPEND_SUSPEND); | |
1543 | } else | |
ecf762b2 | 1544 | dpm_show_time(starttime, state, NULL); |
bb3632c6 | 1545 | trace_suspend_resume(TPS("dpm_suspend"), state.event, false); |
1eede070 RW |
1546 | return error; |
1547 | } | |
1548 | ||
1549 | /** | |
20d652d7 RW |
1550 | * device_prepare - Prepare a device for system power transition. |
1551 | * @dev: Device to handle. | |
1552 | * @state: PM transition of the system being carried out. | |
1553 | * | |
1554 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
1555 | * device may be registered after this function has returned. | |
1eede070 | 1556 | */ |
d1616302 | 1557 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 | 1558 | { |
35cd133c | 1559 | int (*callback)(struct device *) = NULL; |
aae4518b | 1560 | int ret = 0; |
1eede070 | 1561 | |
dbf37414 RW |
1562 | if (dev->power.syscore) |
1563 | return 0; | |
1564 | ||
88d26136 AS |
1565 | /* |
1566 | * If a device's parent goes into runtime suspend at the wrong time, | |
1567 | * it won't be possible to resume the device. To prevent this we | |
1568 | * block runtime suspend here, during the prepare phase, and allow | |
1569 | * it again during the complete phase. | |
1570 | */ | |
1571 | pm_runtime_get_noresume(dev); | |
1572 | ||
8e9394ce | 1573 | device_lock(dev); |
1eede070 | 1574 | |
4ca46ff3 RW |
1575 | dev->power.wakeup_path = device_may_wakeup(dev); |
1576 | ||
aa8e54b5 TV |
1577 | if (dev->power.no_pm_callbacks) { |
1578 | ret = 1; /* Let device go direct_complete */ | |
1579 | goto unlock; | |
1580 | } | |
1581 | ||
fba1fbf5 | 1582 | if (dev->pm_domain) |
35cd133c | 1583 | callback = dev->pm_domain->ops.prepare; |
fba1fbf5 | 1584 | else if (dev->type && dev->type->pm) |
35cd133c | 1585 | callback = dev->type->pm->prepare; |
fba1fbf5 | 1586 | else if (dev->class && dev->class->pm) |
35cd133c | 1587 | callback = dev->class->pm->prepare; |
fba1fbf5 | 1588 | else if (dev->bus && dev->bus->pm) |
35cd133c | 1589 | callback = dev->bus->pm->prepare; |
35cd133c | 1590 | |
fba1fbf5 | 1591 | if (!callback && dev->driver && dev->driver->pm) |
35cd133c | 1592 | callback = dev->driver->pm->prepare; |
35cd133c | 1593 | |
32e8d689 | 1594 | if (callback) |
aae4518b | 1595 | ret = callback(dev); |
7538e3db | 1596 | |
aa8e54b5 | 1597 | unlock: |
8e9394ce | 1598 | device_unlock(dev); |
1eede070 | 1599 | |
aae4518b RW |
1600 | if (ret < 0) { |
1601 | suspend_report_result(callback, ret); | |
aa1b9f13 | 1602 | pm_runtime_put(dev); |
aae4518b RW |
1603 | return ret; |
1604 | } | |
1605 | /* | |
1606 | * A positive return value from ->prepare() means "this device appears | |
1607 | * to be runtime-suspended and its state is fine, so if it really is | |
1608 | * runtime-suspended, you can leave it in that state provided that you | |
1609 | * will do the same thing with all of its descendants". This only | |
1610 | * applies to suspend transitions, however. | |
1611 | */ | |
1612 | spin_lock_irq(&dev->power.lock); | |
1613 | dev->power.direct_complete = ret > 0 && state.event == PM_EVENT_SUSPEND; | |
1614 | spin_unlock_irq(&dev->power.lock); | |
1615 | return 0; | |
1eede070 | 1616 | } |
cd59abfc | 1617 | |
1eede070 | 1618 | /** |
20d652d7 RW |
1619 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1620 | * @state: PM transition of the system being carried out. | |
1eede070 | 1621 | * |
20d652d7 | 1622 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 | 1623 | */ |
91e7c75b | 1624 | int dpm_prepare(pm_message_t state) |
1eede070 | 1625 | { |
1eede070 RW |
1626 | int error = 0; |
1627 | ||
bb3632c6 | 1628 | trace_suspend_resume(TPS("dpm_prepare"), state.event, true); |
91e7c75b RW |
1629 | might_sleep(); |
1630 | ||
013c074f SG |
1631 | /* |
1632 | * Give a chance for the known devices to complete their probes, before | |
1633 | * disable probing of devices. This sync point is important at least | |
1634 | * at boot time + hibernation restore. | |
1635 | */ | |
1636 | wait_for_device_probe(); | |
1637 | /* | |
1638 | * It is unsafe if probing of devices will happen during suspend or | |
1639 | * hibernation and system behavior will be unpredictable in this case. | |
1640 | * So, let's prohibit device's probing here and defer their probes | |
1641 | * instead. The normal behavior will be restored in dpm_complete(). | |
1642 | */ | |
1643 | device_block_probing(); | |
1644 | ||
1eede070 | 1645 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
1646 | while (!list_empty(&dpm_list)) { |
1647 | struct device *dev = to_device(dpm_list.next); | |
1648 | ||
1649 | get_device(dev); | |
1eede070 RW |
1650 | mutex_unlock(&dpm_list_mtx); |
1651 | ||
32e8d689 | 1652 | trace_device_pm_callback_start(dev, "", state.event); |
1e2ef05b | 1653 | error = device_prepare(dev, state); |
32e8d689 | 1654 | trace_device_pm_callback_end(dev, error); |
1eede070 RW |
1655 | |
1656 | mutex_lock(&dpm_list_mtx); | |
1657 | if (error) { | |
1eede070 RW |
1658 | if (error == -EAGAIN) { |
1659 | put_device(dev); | |
886a7a33 | 1660 | error = 0; |
1eede070 RW |
1661 | continue; |
1662 | } | |
1e75227e RW |
1663 | printk(KERN_INFO "PM: Device %s not prepared " |
1664 | "for power transition: code %d\n", | |
5c1a07ab | 1665 | dev_name(dev), error); |
1eede070 RW |
1666 | put_device(dev); |
1667 | break; | |
1668 | } | |
f76b168b | 1669 | dev->power.is_prepared = true; |
1eede070 | 1670 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1671 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1672 | put_device(dev); |
1673 | } | |
1eede070 | 1674 | mutex_unlock(&dpm_list_mtx); |
bb3632c6 | 1675 | trace_suspend_resume(TPS("dpm_prepare"), state.event, false); |
cd59abfc AS |
1676 | return error; |
1677 | } | |
1678 | ||
775b64d2 | 1679 | /** |
20d652d7 RW |
1680 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1681 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1682 | * |
20d652d7 RW |
1683 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1684 | * callbacks for them. | |
775b64d2 | 1685 | */ |
d1616302 | 1686 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1687 | { |
1688 | int error; | |
cd59abfc | 1689 | |
1eede070 | 1690 | error = dpm_prepare(state); |
2a77c46d SL |
1691 | if (error) { |
1692 | suspend_stats.failed_prepare++; | |
1693 | dpm_save_failed_step(SUSPEND_PREPARE); | |
1694 | } else | |
1eede070 | 1695 | error = dpm_suspend(state); |
cd59abfc | 1696 | return error; |
cd59abfc | 1697 | } |
d1616302 | 1698 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1699 | |
1700 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1701 | { | |
c80cfb04 BH |
1702 | if (ret) |
1703 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1704 | } |
1705 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1706 | |
1707 | /** | |
1708 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1709 | * @dev: Device to wait for. | |
1710 | * @subordinate: Device that needs to wait for @dev. | |
1711 | */ | |
098dff73 | 1712 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1713 | { |
1714 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1715 | return async_error; |
f8824cee RW |
1716 | } |
1717 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); | |
dfe3212e ML |
1718 | |
1719 | /** | |
1720 | * dpm_for_each_dev - device iterator. | |
1721 | * @data: data for the callback. | |
1722 | * @fn: function to be called for each device. | |
1723 | * | |
1724 | * Iterate over devices in dpm_list, and call @fn for each device, | |
1725 | * passing it @data. | |
1726 | */ | |
1727 | void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) | |
1728 | { | |
1729 | struct device *dev; | |
1730 | ||
1731 | if (!fn) | |
1732 | return; | |
1733 | ||
1734 | device_pm_lock(); | |
1735 | list_for_each_entry(dev, &dpm_list, power.entry) | |
1736 | fn(dev, data); | |
1737 | device_pm_unlock(); | |
1738 | } | |
1739 | EXPORT_SYMBOL_GPL(dpm_for_each_dev); | |
aa8e54b5 TV |
1740 | |
1741 | static bool pm_ops_is_empty(const struct dev_pm_ops *ops) | |
1742 | { | |
1743 | if (!ops) | |
1744 | return true; | |
1745 | ||
1746 | return !ops->prepare && | |
1747 | !ops->suspend && | |
1748 | !ops->suspend_late && | |
1749 | !ops->suspend_noirq && | |
1750 | !ops->resume_noirq && | |
1751 | !ops->resume_early && | |
1752 | !ops->resume && | |
1753 | !ops->complete; | |
1754 | } | |
1755 | ||
1756 | void device_pm_check_callbacks(struct device *dev) | |
1757 | { | |
1758 | spin_lock_irq(&dev->power.lock); | |
1759 | dev->power.no_pm_callbacks = | |
1760 | (!dev->bus || pm_ops_is_empty(dev->bus->pm)) && | |
1761 | (!dev->class || pm_ops_is_empty(dev->class->pm)) && | |
1762 | (!dev->type || pm_ops_is_empty(dev->type->pm)) && | |
1763 | (!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) && | |
1764 | (!dev->driver || pm_ops_is_empty(dev->driver->pm)); | |
1765 | spin_unlock_irq(&dev->power.lock); | |
1766 | } |