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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 | 216 | } |
53644677 SK |
217 | |
218 | trace_device_pm_report_time(dev, info, nsecs, pm_verb(state.event), | |
219 | error); | |
875ab0b7 RW |
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); | |
390 | error = cb(dev); | |
391 | suspend_report_result(cb, error); | |
392 | ||
53644677 | 393 | initcall_debug_report(dev, calltime, error, state, info); |
9cf519d1 RW |
394 | |
395 | return error; | |
396 | } | |
397 | ||
70fea60d BG |
398 | #ifdef CONFIG_DPM_WATCHDOG |
399 | struct dpm_watchdog { | |
400 | struct device *dev; | |
401 | struct task_struct *tsk; | |
402 | struct timer_list timer; | |
403 | }; | |
404 | ||
405 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \ | |
406 | struct dpm_watchdog wd | |
407 | ||
408 | /** | |
409 | * dpm_watchdog_handler - Driver suspend / resume watchdog handler. | |
410 | * @data: Watchdog object address. | |
411 | * | |
412 | * Called when a driver has timed out suspending or resuming. | |
413 | * There's not much we can do here to recover so panic() to | |
414 | * capture a crash-dump in pstore. | |
415 | */ | |
416 | static void dpm_watchdog_handler(unsigned long data) | |
417 | { | |
418 | struct dpm_watchdog *wd = (void *)data; | |
419 | ||
420 | dev_emerg(wd->dev, "**** DPM device timeout ****\n"); | |
421 | show_stack(wd->tsk, NULL); | |
422 | panic("%s %s: unrecoverable failure\n", | |
423 | dev_driver_string(wd->dev), dev_name(wd->dev)); | |
424 | } | |
425 | ||
426 | /** | |
427 | * dpm_watchdog_set - Enable pm watchdog for given device. | |
428 | * @wd: Watchdog. Must be allocated on the stack. | |
429 | * @dev: Device to handle. | |
430 | */ | |
431 | static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev) | |
432 | { | |
433 | struct timer_list *timer = &wd->timer; | |
434 | ||
435 | wd->dev = dev; | |
436 | wd->tsk = current; | |
437 | ||
438 | init_timer_on_stack(timer); | |
439 | /* use same timeout value for both suspend and resume */ | |
440 | timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT; | |
441 | timer->function = dpm_watchdog_handler; | |
442 | timer->data = (unsigned long)wd; | |
443 | add_timer(timer); | |
444 | } | |
445 | ||
446 | /** | |
447 | * dpm_watchdog_clear - Disable suspend/resume watchdog. | |
448 | * @wd: Watchdog to disable. | |
449 | */ | |
450 | static void dpm_watchdog_clear(struct dpm_watchdog *wd) | |
451 | { | |
452 | struct timer_list *timer = &wd->timer; | |
453 | ||
454 | del_timer_sync(timer); | |
455 | destroy_timer_on_stack(timer); | |
456 | } | |
457 | #else | |
458 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) | |
459 | #define dpm_watchdog_set(x, y) | |
460 | #define dpm_watchdog_clear(x) | |
461 | #endif | |
462 | ||
cd59abfc AS |
463 | /*------------------------- Resume routines -------------------------*/ |
464 | ||
465 | /** | |
20d652d7 RW |
466 | * device_resume_noirq - Execute an "early resume" callback for given device. |
467 | * @dev: Device to handle. | |
468 | * @state: PM transition of the system being carried out. | |
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 | |
32bdfac5 | 548 | mutex_lock(&dpm_list_mtx); |
76569faa | 549 | pm_transition = state; |
d08a5ace | 550 | |
76569faa LC |
551 | /* |
552 | * Advanced the async threads upfront, | |
553 | * in case the starting of async threads is | |
554 | * delayed by non-async resuming devices. | |
555 | */ | |
556 | list_for_each_entry(dev, &dpm_noirq_list, power.entry) { | |
557 | reinit_completion(&dev->power.completion); | |
558 | if (is_async(dev)) { | |
559 | get_device(dev); | |
560 | async_schedule(async_resume_noirq, dev); | |
561 | } | |
562 | } | |
563 | ||
564 | while (!list_empty(&dpm_noirq_list)) { | |
565 | dev = to_device(dpm_noirq_list.next); | |
d08a5ace | 566 | get_device(dev); |
cf579dfb | 567 | list_move_tail(&dev->power.entry, &dpm_late_early_list); |
5b219a51 | 568 | mutex_unlock(&dpm_list_mtx); |
d08a5ace | 569 | |
76569faa LC |
570 | if (!is_async(dev)) { |
571 | int error; | |
572 | ||
573 | error = device_resume_noirq(dev, state, false); | |
574 | if (error) { | |
575 | suspend_stats.failed_resume_noirq++; | |
576 | dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); | |
577 | dpm_save_failed_dev(dev_name(dev)); | |
578 | pm_dev_err(dev, state, " noirq", error); | |
579 | } | |
cf579dfb RW |
580 | } |
581 | ||
582 | mutex_lock(&dpm_list_mtx); | |
583 | put_device(dev); | |
584 | } | |
585 | mutex_unlock(&dpm_list_mtx); | |
76569faa | 586 | async_synchronize_full(); |
cf579dfb RW |
587 | dpm_show_time(starttime, state, "noirq"); |
588 | resume_device_irqs(); | |
8651f97b | 589 | cpuidle_resume(); |
cf579dfb RW |
590 | } |
591 | ||
592 | /** | |
593 | * device_resume_early - Execute an "early resume" callback for given device. | |
594 | * @dev: Device to handle. | |
595 | * @state: PM transition of the system being carried out. | |
596 | * | |
597 | * Runtime PM is disabled for @dev while this function is being executed. | |
598 | */ | |
9e5e7910 | 599 | static int device_resume_early(struct device *dev, pm_message_t state, bool async) |
cf579dfb RW |
600 | { |
601 | pm_callback_t callback = NULL; | |
602 | char *info = NULL; | |
603 | int error = 0; | |
604 | ||
605 | TRACE_DEVICE(dev); | |
606 | TRACE_RESUME(0); | |
607 | ||
aae4518b | 608 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
609 | goto Out; |
610 | ||
3d2699bc LC |
611 | if (!dev->power.is_late_suspended) |
612 | goto Out; | |
613 | ||
9e5e7910 LC |
614 | dpm_wait(dev->parent, async); |
615 | ||
cf579dfb RW |
616 | if (dev->pm_domain) { |
617 | info = "early power domain "; | |
618 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
619 | } else if (dev->type && dev->type->pm) { | |
620 | info = "early type "; | |
621 | callback = pm_late_early_op(dev->type->pm, state); | |
622 | } else if (dev->class && dev->class->pm) { | |
623 | info = "early class "; | |
624 | callback = pm_late_early_op(dev->class->pm, state); | |
625 | } else if (dev->bus && dev->bus->pm) { | |
626 | info = "early bus "; | |
627 | callback = pm_late_early_op(dev->bus->pm, state); | |
628 | } | |
629 | ||
630 | if (!callback && dev->driver && dev->driver->pm) { | |
631 | info = "early driver "; | |
632 | callback = pm_late_early_op(dev->driver->pm, state); | |
633 | } | |
634 | ||
635 | error = dpm_run_callback(callback, dev, state, info); | |
3d2699bc | 636 | dev->power.is_late_suspended = false; |
cf579dfb | 637 | |
dbf37414 | 638 | Out: |
cf579dfb | 639 | TRACE_RESUME(error); |
9f6d8f6a RW |
640 | |
641 | pm_runtime_enable(dev); | |
9e5e7910 | 642 | complete_all(&dev->power.completion); |
cf579dfb RW |
643 | return error; |
644 | } | |
645 | ||
9e5e7910 LC |
646 | static void async_resume_early(void *data, async_cookie_t cookie) |
647 | { | |
648 | struct device *dev = (struct device *)data; | |
649 | int error; | |
650 | ||
651 | error = device_resume_early(dev, pm_transition, true); | |
652 | if (error) | |
653 | pm_dev_err(dev, pm_transition, " async", error); | |
654 | ||
655 | put_device(dev); | |
656 | } | |
657 | ||
cf579dfb RW |
658 | /** |
659 | * dpm_resume_early - Execute "early resume" callbacks for all devices. | |
660 | * @state: PM transition of the system being carried out. | |
661 | */ | |
662 | static void dpm_resume_early(pm_message_t state) | |
663 | { | |
9e5e7910 | 664 | struct device *dev; |
cf579dfb RW |
665 | ktime_t starttime = ktime_get(); |
666 | ||
667 | mutex_lock(&dpm_list_mtx); | |
9e5e7910 LC |
668 | pm_transition = state; |
669 | ||
670 | /* | |
671 | * Advanced the async threads upfront, | |
672 | * in case the starting of async threads is | |
673 | * delayed by non-async resuming devices. | |
674 | */ | |
675 | list_for_each_entry(dev, &dpm_late_early_list, power.entry) { | |
676 | reinit_completion(&dev->power.completion); | |
677 | if (is_async(dev)) { | |
678 | get_device(dev); | |
679 | async_schedule(async_resume_early, dev); | |
680 | } | |
681 | } | |
cf579dfb | 682 | |
9e5e7910 LC |
683 | while (!list_empty(&dpm_late_early_list)) { |
684 | dev = to_device(dpm_late_early_list.next); | |
cf579dfb RW |
685 | get_device(dev); |
686 | list_move_tail(&dev->power.entry, &dpm_suspended_list); | |
687 | mutex_unlock(&dpm_list_mtx); | |
688 | ||
9e5e7910 LC |
689 | if (!is_async(dev)) { |
690 | int error; | |
d08a5ace | 691 | |
9e5e7910 LC |
692 | error = device_resume_early(dev, state, false); |
693 | if (error) { | |
694 | suspend_stats.failed_resume_early++; | |
695 | dpm_save_failed_step(SUSPEND_RESUME_EARLY); | |
696 | dpm_save_failed_dev(dev_name(dev)); | |
697 | pm_dev_err(dev, state, " early", error); | |
698 | } | |
699 | } | |
5b219a51 | 700 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
701 | put_device(dev); |
702 | } | |
32bdfac5 | 703 | mutex_unlock(&dpm_list_mtx); |
9e5e7910 | 704 | async_synchronize_full(); |
ecf762b2 | 705 | dpm_show_time(starttime, state, "early"); |
775b64d2 | 706 | } |
cf579dfb RW |
707 | |
708 | /** | |
709 | * dpm_resume_start - Execute "noirq" and "early" device callbacks. | |
710 | * @state: PM transition of the system being carried out. | |
711 | */ | |
712 | void dpm_resume_start(pm_message_t state) | |
713 | { | |
714 | dpm_resume_noirq(state); | |
715 | dpm_resume_early(state); | |
716 | } | |
717 | EXPORT_SYMBOL_GPL(dpm_resume_start); | |
775b64d2 RW |
718 | |
719 | /** | |
97df8c12 | 720 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
721 | * @dev: Device to handle. |
722 | * @state: PM transition of the system being carried out. | |
5af84b82 | 723 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 724 | */ |
97df8c12 | 725 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 726 | { |
9cf519d1 RW |
727 | pm_callback_t callback = NULL; |
728 | char *info = NULL; | |
775b64d2 | 729 | int error = 0; |
70fea60d | 730 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
775b64d2 RW |
731 | |
732 | TRACE_DEVICE(dev); | |
733 | TRACE_RESUME(0); | |
cd59abfc | 734 | |
dbf37414 RW |
735 | if (dev->power.syscore) |
736 | goto Complete; | |
737 | ||
aae4518b RW |
738 | if (dev->power.direct_complete) { |
739 | /* Match the pm_runtime_disable() in __device_suspend(). */ | |
740 | pm_runtime_enable(dev); | |
741 | goto Complete; | |
742 | } | |
743 | ||
5af84b82 | 744 | dpm_wait(dev->parent, async); |
70fea60d | 745 | dpm_watchdog_set(&wd, dev); |
8e9394ce | 746 | device_lock(dev); |
7a8d37a3 | 747 | |
f76b168b AS |
748 | /* |
749 | * This is a fib. But we'll allow new children to be added below | |
750 | * a resumed device, even if the device hasn't been completed yet. | |
751 | */ | |
752 | dev->power.is_prepared = false; | |
97df8c12 | 753 | |
6d0e0e84 AS |
754 | if (!dev->power.is_suspended) |
755 | goto Unlock; | |
756 | ||
564b905a | 757 | if (dev->pm_domain) { |
9cf519d1 RW |
758 | info = "power domain "; |
759 | callback = pm_op(&dev->pm_domain->ops, state); | |
35cd133c | 760 | goto Driver; |
7538e3db RW |
761 | } |
762 | ||
9659cc06 | 763 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
764 | info = "type "; |
765 | callback = pm_op(dev->type->pm, state); | |
35cd133c | 766 | goto Driver; |
cd59abfc AS |
767 | } |
768 | ||
1eede070 RW |
769 | if (dev->class) { |
770 | if (dev->class->pm) { | |
9cf519d1 RW |
771 | info = "class "; |
772 | callback = pm_op(dev->class->pm, state); | |
35cd133c | 773 | goto Driver; |
1eede070 | 774 | } else if (dev->class->resume) { |
9cf519d1 RW |
775 | info = "legacy class "; |
776 | callback = dev->class->resume; | |
9659cc06 | 777 | goto End; |
1eede070 | 778 | } |
cd59abfc | 779 | } |
9659cc06 RW |
780 | |
781 | if (dev->bus) { | |
782 | if (dev->bus->pm) { | |
35cd133c | 783 | info = "bus "; |
9cf519d1 | 784 | callback = pm_op(dev->bus->pm, state); |
9659cc06 | 785 | } else if (dev->bus->resume) { |
35cd133c | 786 | info = "legacy bus "; |
9cf519d1 | 787 | callback = dev->bus->resume; |
35cd133c | 788 | goto End; |
9659cc06 RW |
789 | } |
790 | } | |
791 | ||
35cd133c RW |
792 | Driver: |
793 | if (!callback && dev->driver && dev->driver->pm) { | |
794 | info = "driver "; | |
795 | callback = pm_op(dev->driver->pm, state); | |
796 | } | |
797 | ||
1eede070 | 798 | End: |
9cf519d1 | 799 | error = dpm_run_callback(callback, dev, state, info); |
6d0e0e84 AS |
800 | dev->power.is_suspended = false; |
801 | ||
802 | Unlock: | |
8e9394ce | 803 | device_unlock(dev); |
70fea60d | 804 | dpm_watchdog_clear(&wd); |
dbf37414 RW |
805 | |
806 | Complete: | |
5af84b82 | 807 | complete_all(&dev->power.completion); |
7a8d37a3 | 808 | |
cd59abfc | 809 | TRACE_RESUME(error); |
1e2ef05b | 810 | |
cd59abfc AS |
811 | return error; |
812 | } | |
813 | ||
5af84b82 RW |
814 | static void async_resume(void *data, async_cookie_t cookie) |
815 | { | |
816 | struct device *dev = (struct device *)data; | |
817 | int error; | |
818 | ||
97df8c12 | 819 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
820 | if (error) |
821 | pm_dev_err(dev, pm_transition, " async", error); | |
822 | put_device(dev); | |
823 | } | |
824 | ||
775b64d2 | 825 | /** |
20d652d7 RW |
826 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
827 | * @state: PM transition of the system being carried out. | |
775b64d2 | 828 | * |
20d652d7 RW |
829 | * Execute the appropriate "resume" callback for all devices whose status |
830 | * indicates that they are suspended. | |
1eede070 | 831 | */ |
91e7c75b | 832 | void dpm_resume(pm_message_t state) |
1eede070 | 833 | { |
97df8c12 | 834 | struct device *dev; |
ecf762b2 | 835 | ktime_t starttime = ktime_get(); |
1eede070 | 836 | |
91e7c75b RW |
837 | might_sleep(); |
838 | ||
1eede070 | 839 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 840 | pm_transition = state; |
098dff73 | 841 | async_error = 0; |
1eede070 | 842 | |
8a43a9ab | 843 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
16735d02 | 844 | reinit_completion(&dev->power.completion); |
97df8c12 RW |
845 | if (is_async(dev)) { |
846 | get_device(dev); | |
847 | async_schedule(async_resume, dev); | |
848 | } | |
849 | } | |
850 | ||
8a43a9ab RW |
851 | while (!list_empty(&dpm_suspended_list)) { |
852 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 853 | get_device(dev); |
5b219a51 | 854 | if (!is_async(dev)) { |
1eede070 RW |
855 | int error; |
856 | ||
1eede070 RW |
857 | mutex_unlock(&dpm_list_mtx); |
858 | ||
97df8c12 | 859 | error = device_resume(dev, state, false); |
2a77c46d SL |
860 | if (error) { |
861 | suspend_stats.failed_resume++; | |
862 | dpm_save_failed_step(SUSPEND_RESUME); | |
863 | dpm_save_failed_dev(dev_name(dev)); | |
1eede070 | 864 | pm_dev_err(dev, state, "", error); |
2a77c46d | 865 | } |
5b219a51 RW |
866 | |
867 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
868 | } |
869 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 870 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
871 | put_device(dev); |
872 | } | |
1eede070 | 873 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 874 | async_synchronize_full(); |
ecf762b2 | 875 | dpm_show_time(starttime, state, NULL); |
2f0aea93 VK |
876 | |
877 | cpufreq_resume(); | |
1eede070 RW |
878 | } |
879 | ||
880 | /** | |
20d652d7 RW |
881 | * device_complete - Complete a PM transition for given device. |
882 | * @dev: Device to handle. | |
883 | * @state: PM transition of the system being carried out. | |
1eede070 | 884 | */ |
d1616302 | 885 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 886 | { |
35cd133c RW |
887 | void (*callback)(struct device *) = NULL; |
888 | char *info = NULL; | |
889 | ||
dbf37414 RW |
890 | if (dev->power.syscore) |
891 | return; | |
892 | ||
8e9394ce | 893 | device_lock(dev); |
1eede070 | 894 | |
564b905a | 895 | if (dev->pm_domain) { |
35cd133c RW |
896 | info = "completing power domain "; |
897 | callback = dev->pm_domain->ops.complete; | |
4d27e9dc | 898 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
899 | info = "completing type "; |
900 | callback = dev->type->pm->complete; | |
9659cc06 | 901 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
902 | info = "completing class "; |
903 | callback = dev->class->pm->complete; | |
9659cc06 | 904 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
905 | info = "completing bus "; |
906 | callback = dev->bus->pm->complete; | |
907 | } | |
908 | ||
909 | if (!callback && dev->driver && dev->driver->pm) { | |
910 | info = "completing driver "; | |
911 | callback = dev->driver->pm->complete; | |
912 | } | |
913 | ||
914 | if (callback) { | |
915 | pm_dev_dbg(dev, state, info); | |
916 | callback(dev); | |
1eede070 RW |
917 | } |
918 | ||
8e9394ce | 919 | device_unlock(dev); |
88d26136 | 920 | |
af939339 | 921 | pm_runtime_put(dev); |
1eede070 RW |
922 | } |
923 | ||
924 | /** | |
20d652d7 RW |
925 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
926 | * @state: PM transition of the system being carried out. | |
775b64d2 | 927 | * |
20d652d7 RW |
928 | * Execute the ->complete() callbacks for all devices whose PM status is not |
929 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 930 | */ |
91e7c75b | 931 | void dpm_complete(pm_message_t state) |
cd59abfc | 932 | { |
1eede070 RW |
933 | struct list_head list; |
934 | ||
91e7c75b RW |
935 | might_sleep(); |
936 | ||
1eede070 | 937 | INIT_LIST_HEAD(&list); |
cd59abfc | 938 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
939 | while (!list_empty(&dpm_prepared_list)) { |
940 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 941 | |
1eede070 | 942 | get_device(dev); |
f76b168b | 943 | dev->power.is_prepared = false; |
5b219a51 RW |
944 | list_move(&dev->power.entry, &list); |
945 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 946 | |
5b219a51 | 947 | device_complete(dev, state); |
1eede070 | 948 | |
5b219a51 | 949 | mutex_lock(&dpm_list_mtx); |
1eede070 | 950 | put_device(dev); |
cd59abfc | 951 | } |
1eede070 | 952 | list_splice(&list, &dpm_list); |
cd59abfc AS |
953 | mutex_unlock(&dpm_list_mtx); |
954 | } | |
955 | ||
cd59abfc | 956 | /** |
20d652d7 RW |
957 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
958 | * @state: PM transition of the system being carried out. | |
cd59abfc | 959 | * |
20d652d7 RW |
960 | * Execute "resume" callbacks for all devices and complete the PM transition of |
961 | * the system. | |
cd59abfc | 962 | */ |
d1616302 | 963 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 964 | { |
1eede070 RW |
965 | dpm_resume(state); |
966 | dpm_complete(state); | |
cd59abfc | 967 | } |
d1616302 | 968 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
969 | |
970 | ||
971 | /*------------------------- Suspend routines -------------------------*/ | |
972 | ||
1eede070 | 973 | /** |
20d652d7 RW |
974 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
975 | * @sleep_state: PM message representing a sleep state. | |
976 | * | |
977 | * Return a PM message representing the resume event corresponding to given | |
978 | * sleep state. | |
1eede070 RW |
979 | */ |
980 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 981 | { |
1eede070 RW |
982 | switch (sleep_state.event) { |
983 | case PM_EVENT_SUSPEND: | |
984 | return PMSG_RESUME; | |
985 | case PM_EVENT_FREEZE: | |
986 | case PM_EVENT_QUIESCE: | |
987 | return PMSG_RECOVER; | |
988 | case PM_EVENT_HIBERNATE: | |
989 | return PMSG_RESTORE; | |
cd59abfc | 990 | } |
1eede070 | 991 | return PMSG_ON; |
cd59abfc AS |
992 | } |
993 | ||
994 | /** | |
20d652d7 RW |
995 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
996 | * @dev: Device to handle. | |
997 | * @state: PM transition of the system being carried out. | |
775b64d2 | 998 | * |
20d652d7 RW |
999 | * The driver of @dev will not receive interrupts while this function is being |
1000 | * executed. | |
cd59abfc | 1001 | */ |
28b6fd6e | 1002 | static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 1003 | { |
9cf519d1 RW |
1004 | pm_callback_t callback = NULL; |
1005 | char *info = NULL; | |
28b6fd6e LC |
1006 | int error = 0; |
1007 | ||
1008 | if (async_error) | |
1009 | goto Complete; | |
1010 | ||
1011 | if (pm_wakeup_pending()) { | |
1012 | async_error = -EBUSY; | |
1013 | goto Complete; | |
1014 | } | |
e7176a37 | 1015 | |
aae4518b | 1016 | if (dev->power.syscore || dev->power.direct_complete) |
28b6fd6e LC |
1017 | goto Complete; |
1018 | ||
1019 | dpm_wait_for_children(dev, async); | |
dbf37414 | 1020 | |
564b905a | 1021 | if (dev->pm_domain) { |
cf579dfb | 1022 | info = "noirq power domain "; |
9cf519d1 | 1023 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 1024 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 1025 | info = "noirq type "; |
9cf519d1 | 1026 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 1027 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 1028 | info = "noirq class "; |
9cf519d1 | 1029 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 1030 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 1031 | info = "noirq bus "; |
9cf519d1 | 1032 | callback = pm_noirq_op(dev->bus->pm, state); |
7538e3db RW |
1033 | } |
1034 | ||
35cd133c | 1035 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 1036 | info = "noirq driver "; |
35cd133c RW |
1037 | callback = pm_noirq_op(dev->driver->pm, state); |
1038 | } | |
1039 | ||
3d2699bc LC |
1040 | error = dpm_run_callback(callback, dev, state, info); |
1041 | if (!error) | |
1042 | dev->power.is_noirq_suspended = true; | |
28b6fd6e LC |
1043 | else |
1044 | async_error = error; | |
3d2699bc | 1045 | |
28b6fd6e LC |
1046 | Complete: |
1047 | complete_all(&dev->power.completion); | |
3d2699bc | 1048 | return error; |
775b64d2 RW |
1049 | } |
1050 | ||
28b6fd6e LC |
1051 | static void async_suspend_noirq(void *data, async_cookie_t cookie) |
1052 | { | |
1053 | struct device *dev = (struct device *)data; | |
1054 | int error; | |
1055 | ||
1056 | error = __device_suspend_noirq(dev, pm_transition, true); | |
1057 | if (error) { | |
1058 | dpm_save_failed_dev(dev_name(dev)); | |
1059 | pm_dev_err(dev, pm_transition, " async", error); | |
1060 | } | |
1061 | ||
1062 | put_device(dev); | |
1063 | } | |
1064 | ||
1065 | static int device_suspend_noirq(struct device *dev) | |
1066 | { | |
1067 | reinit_completion(&dev->power.completion); | |
1068 | ||
1069 | if (pm_async_enabled && dev->power.async_suspend) { | |
1070 | get_device(dev); | |
1071 | async_schedule(async_suspend_noirq, dev); | |
1072 | return 0; | |
1073 | } | |
1074 | return __device_suspend_noirq(dev, pm_transition, false); | |
1075 | } | |
1076 | ||
775b64d2 | 1077 | /** |
cf579dfb | 1078 | * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices. |
20d652d7 | 1079 | * @state: PM transition of the system being carried out. |
775b64d2 | 1080 | * |
20d652d7 RW |
1081 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
1082 | * handlers for all non-sysdev devices. | |
775b64d2 | 1083 | */ |
cf579dfb | 1084 | static int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 1085 | { |
ecf762b2 | 1086 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
1087 | int error = 0; |
1088 | ||
8651f97b | 1089 | cpuidle_pause(); |
2ed8d2b3 | 1090 | suspend_device_irqs(); |
32bdfac5 | 1091 | mutex_lock(&dpm_list_mtx); |
28b6fd6e LC |
1092 | pm_transition = state; |
1093 | async_error = 0; | |
1094 | ||
cf579dfb RW |
1095 | while (!list_empty(&dpm_late_early_list)) { |
1096 | struct device *dev = to_device(dpm_late_early_list.prev); | |
d08a5ace RW |
1097 | |
1098 | get_device(dev); | |
1099 | mutex_unlock(&dpm_list_mtx); | |
1100 | ||
28b6fd6e | 1101 | error = device_suspend_noirq(dev); |
d08a5ace RW |
1102 | |
1103 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 1104 | if (error) { |
cf579dfb | 1105 | pm_dev_err(dev, state, " noirq", error); |
2a77c46d | 1106 | dpm_save_failed_dev(dev_name(dev)); |
d08a5ace | 1107 | put_device(dev); |
775b64d2 RW |
1108 | break; |
1109 | } | |
d08a5ace | 1110 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1111 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 1112 | put_device(dev); |
52d136cc | 1113 | |
28b6fd6e | 1114 | if (async_error) |
52d136cc | 1115 | break; |
775b64d2 | 1116 | } |
32bdfac5 | 1117 | mutex_unlock(&dpm_list_mtx); |
28b6fd6e LC |
1118 | async_synchronize_full(); |
1119 | if (!error) | |
1120 | error = async_error; | |
1121 | ||
1122 | if (error) { | |
1123 | suspend_stats.failed_suspend_noirq++; | |
1124 | dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); | |
d1616302 | 1125 | dpm_resume_noirq(resume_event(state)); |
28b6fd6e | 1126 | } else { |
cf579dfb | 1127 | dpm_show_time(starttime, state, "noirq"); |
28b6fd6e | 1128 | } |
cf579dfb RW |
1129 | return error; |
1130 | } | |
1131 | ||
1132 | /** | |
1133 | * device_suspend_late - Execute a "late suspend" callback for given device. | |
1134 | * @dev: Device to handle. | |
1135 | * @state: PM transition of the system being carried out. | |
1136 | * | |
1137 | * Runtime PM is disabled for @dev while this function is being executed. | |
1138 | */ | |
de377b39 | 1139 | static int __device_suspend_late(struct device *dev, pm_message_t state, bool async) |
cf579dfb RW |
1140 | { |
1141 | pm_callback_t callback = NULL; | |
1142 | char *info = NULL; | |
de377b39 | 1143 | int error = 0; |
cf579dfb | 1144 | |
9f6d8f6a RW |
1145 | __pm_runtime_disable(dev, false); |
1146 | ||
de377b39 LC |
1147 | if (async_error) |
1148 | goto Complete; | |
1149 | ||
1150 | if (pm_wakeup_pending()) { | |
1151 | async_error = -EBUSY; | |
1152 | goto Complete; | |
1153 | } | |
1154 | ||
aae4518b | 1155 | if (dev->power.syscore || dev->power.direct_complete) |
de377b39 LC |
1156 | goto Complete; |
1157 | ||
1158 | dpm_wait_for_children(dev, async); | |
dbf37414 | 1159 | |
cf579dfb RW |
1160 | if (dev->pm_domain) { |
1161 | info = "late power domain "; | |
1162 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
1163 | } else if (dev->type && dev->type->pm) { | |
1164 | info = "late type "; | |
1165 | callback = pm_late_early_op(dev->type->pm, state); | |
1166 | } else if (dev->class && dev->class->pm) { | |
1167 | info = "late class "; | |
1168 | callback = pm_late_early_op(dev->class->pm, state); | |
1169 | } else if (dev->bus && dev->bus->pm) { | |
1170 | info = "late bus "; | |
1171 | callback = pm_late_early_op(dev->bus->pm, state); | |
1172 | } | |
1173 | ||
1174 | if (!callback && dev->driver && dev->driver->pm) { | |
1175 | info = "late driver "; | |
1176 | callback = pm_late_early_op(dev->driver->pm, state); | |
1177 | } | |
1178 | ||
3d2699bc LC |
1179 | error = dpm_run_callback(callback, dev, state, info); |
1180 | if (!error) | |
1181 | dev->power.is_late_suspended = true; | |
de377b39 LC |
1182 | else |
1183 | async_error = error; | |
3d2699bc | 1184 | |
de377b39 LC |
1185 | Complete: |
1186 | complete_all(&dev->power.completion); | |
3d2699bc | 1187 | return error; |
cf579dfb RW |
1188 | } |
1189 | ||
de377b39 LC |
1190 | static void async_suspend_late(void *data, async_cookie_t cookie) |
1191 | { | |
1192 | struct device *dev = (struct device *)data; | |
1193 | int error; | |
1194 | ||
1195 | error = __device_suspend_late(dev, pm_transition, true); | |
1196 | if (error) { | |
1197 | dpm_save_failed_dev(dev_name(dev)); | |
1198 | pm_dev_err(dev, pm_transition, " async", error); | |
1199 | } | |
1200 | put_device(dev); | |
1201 | } | |
1202 | ||
1203 | static int device_suspend_late(struct device *dev) | |
1204 | { | |
1205 | reinit_completion(&dev->power.completion); | |
1206 | ||
1207 | if (pm_async_enabled && dev->power.async_suspend) { | |
1208 | get_device(dev); | |
1209 | async_schedule(async_suspend_late, dev); | |
1210 | return 0; | |
1211 | } | |
1212 | ||
1213 | return __device_suspend_late(dev, pm_transition, false); | |
1214 | } | |
1215 | ||
cf579dfb RW |
1216 | /** |
1217 | * dpm_suspend_late - Execute "late suspend" callbacks for all devices. | |
1218 | * @state: PM transition of the system being carried out. | |
1219 | */ | |
1220 | static int dpm_suspend_late(pm_message_t state) | |
1221 | { | |
1222 | ktime_t starttime = ktime_get(); | |
1223 | int error = 0; | |
1224 | ||
1225 | mutex_lock(&dpm_list_mtx); | |
de377b39 LC |
1226 | pm_transition = state; |
1227 | async_error = 0; | |
1228 | ||
cf579dfb RW |
1229 | while (!list_empty(&dpm_suspended_list)) { |
1230 | struct device *dev = to_device(dpm_suspended_list.prev); | |
1231 | ||
1232 | get_device(dev); | |
1233 | mutex_unlock(&dpm_list_mtx); | |
1234 | ||
de377b39 | 1235 | error = device_suspend_late(dev); |
cf579dfb RW |
1236 | |
1237 | mutex_lock(&dpm_list_mtx); | |
1238 | if (error) { | |
1239 | pm_dev_err(dev, state, " late", error); | |
cf579dfb RW |
1240 | dpm_save_failed_dev(dev_name(dev)); |
1241 | put_device(dev); | |
1242 | break; | |
1243 | } | |
1244 | if (!list_empty(&dev->power.entry)) | |
1245 | list_move(&dev->power.entry, &dpm_late_early_list); | |
1246 | put_device(dev); | |
52d136cc | 1247 | |
de377b39 | 1248 | if (async_error) |
52d136cc | 1249 | break; |
cf579dfb RW |
1250 | } |
1251 | mutex_unlock(&dpm_list_mtx); | |
de377b39 LC |
1252 | async_synchronize_full(); |
1253 | if (error) { | |
1254 | suspend_stats.failed_suspend_late++; | |
1255 | dpm_save_failed_step(SUSPEND_SUSPEND_LATE); | |
cf579dfb | 1256 | dpm_resume_early(resume_event(state)); |
de377b39 | 1257 | } else { |
ecf762b2 | 1258 | dpm_show_time(starttime, state, "late"); |
de377b39 | 1259 | } |
775b64d2 RW |
1260 | return error; |
1261 | } | |
cf579dfb RW |
1262 | |
1263 | /** | |
1264 | * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks. | |
1265 | * @state: PM transition of the system being carried out. | |
1266 | */ | |
1267 | int dpm_suspend_end(pm_message_t state) | |
1268 | { | |
1269 | int error = dpm_suspend_late(state); | |
064b021f CC |
1270 | if (error) |
1271 | return error; | |
1272 | ||
1273 | error = dpm_suspend_noirq(state); | |
1274 | if (error) { | |
997a0311 | 1275 | dpm_resume_early(resume_event(state)); |
064b021f CC |
1276 | return error; |
1277 | } | |
cf579dfb | 1278 | |
064b021f | 1279 | return 0; |
cf579dfb RW |
1280 | } |
1281 | EXPORT_SYMBOL_GPL(dpm_suspend_end); | |
775b64d2 | 1282 | |
875ab0b7 RW |
1283 | /** |
1284 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
1285 | * @dev: Device to suspend. |
1286 | * @state: PM transition of the system being carried out. | |
1287 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
1288 | */ |
1289 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
53644677 SK |
1290 | int (*cb)(struct device *dev, pm_message_t state), |
1291 | char *info) | |
875ab0b7 RW |
1292 | { |
1293 | int error; | |
1294 | ktime_t calltime; | |
1295 | ||
1296 | calltime = initcall_debug_start(dev); | |
1297 | ||
1298 | error = cb(dev, state); | |
1299 | suspend_report_result(cb, error); | |
1300 | ||
53644677 | 1301 | initcall_debug_report(dev, calltime, error, state, info); |
875ab0b7 RW |
1302 | |
1303 | return error; | |
1304 | } | |
1305 | ||
775b64d2 | 1306 | /** |
20d652d7 RW |
1307 | * device_suspend - Execute "suspend" callbacks for given device. |
1308 | * @dev: Device to handle. | |
1309 | * @state: PM transition of the system being carried out. | |
5af84b82 | 1310 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1311 | */ |
5af84b82 | 1312 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 1313 | { |
9cf519d1 RW |
1314 | pm_callback_t callback = NULL; |
1315 | char *info = NULL; | |
cd59abfc | 1316 | int error = 0; |
70fea60d | 1317 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
cd59abfc | 1318 | |
5af84b82 | 1319 | dpm_wait_for_children(dev, async); |
7a8d37a3 | 1320 | |
5af84b82 | 1321 | if (async_error) |
1f758b23 | 1322 | goto Complete; |
1e2ef05b | 1323 | |
88d26136 AS |
1324 | /* |
1325 | * If a device configured to wake up the system from sleep states | |
1326 | * has been suspended at run time and there's a resume request pending | |
1327 | * for it, this is equivalent to the device signaling wakeup, so the | |
1328 | * system suspend operation should be aborted. | |
1329 | */ | |
1e2ef05b RW |
1330 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1331 | pm_wakeup_event(dev, 0); | |
5af84b82 | 1332 | |
d83f905e RW |
1333 | if (pm_wakeup_pending()) { |
1334 | async_error = -EBUSY; | |
1f758b23 | 1335 | goto Complete; |
d83f905e RW |
1336 | } |
1337 | ||
dbf37414 RW |
1338 | if (dev->power.syscore) |
1339 | goto Complete; | |
1340 | ||
aae4518b RW |
1341 | if (dev->power.direct_complete) { |
1342 | if (pm_runtime_status_suspended(dev)) { | |
1343 | pm_runtime_disable(dev); | |
1344 | if (pm_runtime_suspended_if_enabled(dev)) | |
1345 | goto Complete; | |
1346 | ||
1347 | pm_runtime_enable(dev); | |
1348 | } | |
1349 | dev->power.direct_complete = false; | |
1350 | } | |
1351 | ||
70fea60d | 1352 | dpm_watchdog_set(&wd, dev); |
1e2ef05b RW |
1353 | device_lock(dev); |
1354 | ||
564b905a | 1355 | if (dev->pm_domain) { |
9cf519d1 RW |
1356 | info = "power domain "; |
1357 | callback = pm_op(&dev->pm_domain->ops, state); | |
1358 | goto Run; | |
4d27e9dc RW |
1359 | } |
1360 | ||
9659cc06 | 1361 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
1362 | info = "type "; |
1363 | callback = pm_op(dev->type->pm, state); | |
1364 | goto Run; | |
9659cc06 RW |
1365 | } |
1366 | ||
1eede070 RW |
1367 | if (dev->class) { |
1368 | if (dev->class->pm) { | |
9cf519d1 RW |
1369 | info = "class "; |
1370 | callback = pm_op(dev->class->pm, state); | |
1371 | goto Run; | |
1eede070 RW |
1372 | } else if (dev->class->suspend) { |
1373 | pm_dev_dbg(dev, state, "legacy class "); | |
53644677 SK |
1374 | error = legacy_suspend(dev, state, dev->class->suspend, |
1375 | "legacy class "); | |
4d27e9dc | 1376 | goto End; |
1eede070 | 1377 | } |
cd59abfc AS |
1378 | } |
1379 | ||
1eede070 RW |
1380 | if (dev->bus) { |
1381 | if (dev->bus->pm) { | |
35cd133c | 1382 | info = "bus "; |
9cf519d1 | 1383 | callback = pm_op(dev->bus->pm, state); |
1eede070 | 1384 | } else if (dev->bus->suspend) { |
35cd133c | 1385 | pm_dev_dbg(dev, state, "legacy bus "); |
53644677 SK |
1386 | error = legacy_suspend(dev, state, dev->bus->suspend, |
1387 | "legacy bus "); | |
9cf519d1 | 1388 | goto End; |
1eede070 | 1389 | } |
7538e3db RW |
1390 | } |
1391 | ||
9cf519d1 | 1392 | Run: |
35cd133c RW |
1393 | if (!callback && dev->driver && dev->driver->pm) { |
1394 | info = "driver "; | |
1395 | callback = pm_op(dev->driver->pm, state); | |
1396 | } | |
1397 | ||
9cf519d1 RW |
1398 | error = dpm_run_callback(callback, dev, state, info); |
1399 | ||
1eede070 | 1400 | End: |
4ca46ff3 | 1401 | if (!error) { |
aae4518b RW |
1402 | struct device *parent = dev->parent; |
1403 | ||
4ca46ff3 | 1404 | dev->power.is_suspended = true; |
aae4518b RW |
1405 | if (parent) { |
1406 | spin_lock_irq(&parent->power.lock); | |
1407 | ||
1408 | dev->parent->power.direct_complete = false; | |
1409 | if (dev->power.wakeup_path | |
1410 | && !dev->parent->power.ignore_children) | |
1411 | dev->parent->power.wakeup_path = true; | |
1412 | ||
1413 | spin_unlock_irq(&parent->power.lock); | |
1414 | } | |
4ca46ff3 | 1415 | } |
6d0e0e84 | 1416 | |
8e9394ce | 1417 | device_unlock(dev); |
70fea60d | 1418 | dpm_watchdog_clear(&wd); |
1f758b23 MSB |
1419 | |
1420 | Complete: | |
5af84b82 | 1421 | complete_all(&dev->power.completion); |
88d26136 | 1422 | if (error) |
098dff73 RW |
1423 | async_error = error; |
1424 | ||
cd59abfc AS |
1425 | return error; |
1426 | } | |
1427 | ||
5af84b82 RW |
1428 | static void async_suspend(void *data, async_cookie_t cookie) |
1429 | { | |
1430 | struct device *dev = (struct device *)data; | |
1431 | int error; | |
1432 | ||
1433 | error = __device_suspend(dev, pm_transition, true); | |
2a77c46d SL |
1434 | if (error) { |
1435 | dpm_save_failed_dev(dev_name(dev)); | |
5af84b82 | 1436 | pm_dev_err(dev, pm_transition, " async", error); |
2a77c46d | 1437 | } |
5af84b82 RW |
1438 | |
1439 | put_device(dev); | |
1440 | } | |
1441 | ||
1442 | static int device_suspend(struct device *dev) | |
1443 | { | |
16735d02 | 1444 | reinit_completion(&dev->power.completion); |
5af84b82 | 1445 | |
0e06b4a8 | 1446 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
1447 | get_device(dev); |
1448 | async_schedule(async_suspend, dev); | |
1449 | return 0; | |
1450 | } | |
1451 | ||
1452 | return __device_suspend(dev, pm_transition, false); | |
1453 | } | |
1454 | ||
cd59abfc | 1455 | /** |
20d652d7 RW |
1456 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
1457 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1458 | */ |
91e7c75b | 1459 | int dpm_suspend(pm_message_t state) |
cd59abfc | 1460 | { |
ecf762b2 | 1461 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
1462 | int error = 0; |
1463 | ||
91e7c75b RW |
1464 | might_sleep(); |
1465 | ||
2f0aea93 VK |
1466 | cpufreq_suspend(); |
1467 | ||
cd59abfc | 1468 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
1469 | pm_transition = state; |
1470 | async_error = 0; | |
8a43a9ab RW |
1471 | while (!list_empty(&dpm_prepared_list)) { |
1472 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 1473 | |
1eede070 | 1474 | get_device(dev); |
cd59abfc | 1475 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 1476 | |
5af84b82 | 1477 | error = device_suspend(dev); |
1eede070 | 1478 | |
1b3cbec1 | 1479 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 1480 | if (error) { |
1eede070 | 1481 | pm_dev_err(dev, state, "", error); |
2a77c46d | 1482 | dpm_save_failed_dev(dev_name(dev)); |
1eede070 | 1483 | put_device(dev); |
775b64d2 RW |
1484 | break; |
1485 | } | |
7a8d37a3 | 1486 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1487 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 1488 | put_device(dev); |
5af84b82 RW |
1489 | if (async_error) |
1490 | break; | |
cd59abfc AS |
1491 | } |
1492 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
1493 | async_synchronize_full(); |
1494 | if (!error) | |
1495 | error = async_error; | |
2a77c46d SL |
1496 | if (error) { |
1497 | suspend_stats.failed_suspend++; | |
1498 | dpm_save_failed_step(SUSPEND_SUSPEND); | |
1499 | } else | |
ecf762b2 | 1500 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
1501 | return error; |
1502 | } | |
1503 | ||
1504 | /** | |
20d652d7 RW |
1505 | * device_prepare - Prepare a device for system power transition. |
1506 | * @dev: Device to handle. | |
1507 | * @state: PM transition of the system being carried out. | |
1508 | * | |
1509 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
1510 | * device may be registered after this function has returned. | |
1eede070 | 1511 | */ |
d1616302 | 1512 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 | 1513 | { |
35cd133c RW |
1514 | int (*callback)(struct device *) = NULL; |
1515 | char *info = NULL; | |
aae4518b | 1516 | int ret = 0; |
1eede070 | 1517 | |
dbf37414 RW |
1518 | if (dev->power.syscore) |
1519 | return 0; | |
1520 | ||
88d26136 AS |
1521 | /* |
1522 | * If a device's parent goes into runtime suspend at the wrong time, | |
1523 | * it won't be possible to resume the device. To prevent this we | |
1524 | * block runtime suspend here, during the prepare phase, and allow | |
1525 | * it again during the complete phase. | |
1526 | */ | |
1527 | pm_runtime_get_noresume(dev); | |
1528 | ||
8e9394ce | 1529 | device_lock(dev); |
1eede070 | 1530 | |
4ca46ff3 RW |
1531 | dev->power.wakeup_path = device_may_wakeup(dev); |
1532 | ||
564b905a | 1533 | if (dev->pm_domain) { |
35cd133c RW |
1534 | info = "preparing power domain "; |
1535 | callback = dev->pm_domain->ops.prepare; | |
4d27e9dc | 1536 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
1537 | info = "preparing type "; |
1538 | callback = dev->type->pm->prepare; | |
9659cc06 | 1539 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
1540 | info = "preparing class "; |
1541 | callback = dev->class->pm->prepare; | |
9659cc06 | 1542 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
1543 | info = "preparing bus "; |
1544 | callback = dev->bus->pm->prepare; | |
1545 | } | |
1546 | ||
1547 | if (!callback && dev->driver && dev->driver->pm) { | |
1548 | info = "preparing driver "; | |
1549 | callback = dev->driver->pm->prepare; | |
1550 | } | |
1551 | ||
aae4518b RW |
1552 | if (callback) |
1553 | ret = callback(dev); | |
7538e3db | 1554 | |
8e9394ce | 1555 | device_unlock(dev); |
1eede070 | 1556 | |
aae4518b RW |
1557 | if (ret < 0) { |
1558 | suspend_report_result(callback, ret); | |
aa1b9f13 | 1559 | pm_runtime_put(dev); |
aae4518b RW |
1560 | return ret; |
1561 | } | |
1562 | /* | |
1563 | * A positive return value from ->prepare() means "this device appears | |
1564 | * to be runtime-suspended and its state is fine, so if it really is | |
1565 | * runtime-suspended, you can leave it in that state provided that you | |
1566 | * will do the same thing with all of its descendants". This only | |
1567 | * applies to suspend transitions, however. | |
1568 | */ | |
1569 | spin_lock_irq(&dev->power.lock); | |
1570 | dev->power.direct_complete = ret > 0 && state.event == PM_EVENT_SUSPEND; | |
1571 | spin_unlock_irq(&dev->power.lock); | |
1572 | return 0; | |
1eede070 | 1573 | } |
cd59abfc | 1574 | |
1eede070 | 1575 | /** |
20d652d7 RW |
1576 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1577 | * @state: PM transition of the system being carried out. | |
1eede070 | 1578 | * |
20d652d7 | 1579 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 | 1580 | */ |
91e7c75b | 1581 | int dpm_prepare(pm_message_t state) |
1eede070 | 1582 | { |
1eede070 RW |
1583 | int error = 0; |
1584 | ||
91e7c75b RW |
1585 | might_sleep(); |
1586 | ||
1eede070 | 1587 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
1588 | while (!list_empty(&dpm_list)) { |
1589 | struct device *dev = to_device(dpm_list.next); | |
1590 | ||
1591 | get_device(dev); | |
1eede070 RW |
1592 | mutex_unlock(&dpm_list_mtx); |
1593 | ||
1e2ef05b | 1594 | error = device_prepare(dev, state); |
1eede070 RW |
1595 | |
1596 | mutex_lock(&dpm_list_mtx); | |
1597 | if (error) { | |
1eede070 RW |
1598 | if (error == -EAGAIN) { |
1599 | put_device(dev); | |
886a7a33 | 1600 | error = 0; |
1eede070 RW |
1601 | continue; |
1602 | } | |
1e75227e RW |
1603 | printk(KERN_INFO "PM: Device %s not prepared " |
1604 | "for power transition: code %d\n", | |
5c1a07ab | 1605 | dev_name(dev), error); |
1eede070 RW |
1606 | put_device(dev); |
1607 | break; | |
1608 | } | |
f76b168b | 1609 | dev->power.is_prepared = true; |
1eede070 | 1610 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1611 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1612 | put_device(dev); |
1613 | } | |
1eede070 | 1614 | mutex_unlock(&dpm_list_mtx); |
cd59abfc AS |
1615 | return error; |
1616 | } | |
1617 | ||
775b64d2 | 1618 | /** |
20d652d7 RW |
1619 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1620 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1621 | * |
20d652d7 RW |
1622 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1623 | * callbacks for them. | |
775b64d2 | 1624 | */ |
d1616302 | 1625 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1626 | { |
1627 | int error; | |
cd59abfc | 1628 | |
1eede070 | 1629 | error = dpm_prepare(state); |
2a77c46d SL |
1630 | if (error) { |
1631 | suspend_stats.failed_prepare++; | |
1632 | dpm_save_failed_step(SUSPEND_PREPARE); | |
1633 | } else | |
1eede070 | 1634 | error = dpm_suspend(state); |
cd59abfc | 1635 | return error; |
cd59abfc | 1636 | } |
d1616302 | 1637 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1638 | |
1639 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1640 | { | |
c80cfb04 BH |
1641 | if (ret) |
1642 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1643 | } |
1644 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1645 | |
1646 | /** | |
1647 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1648 | * @dev: Device to wait for. | |
1649 | * @subordinate: Device that needs to wait for @dev. | |
1650 | */ | |
098dff73 | 1651 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1652 | { |
1653 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1654 | return async_error; |
f8824cee RW |
1655 | } |
1656 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); | |
dfe3212e ML |
1657 | |
1658 | /** | |
1659 | * dpm_for_each_dev - device iterator. | |
1660 | * @data: data for the callback. | |
1661 | * @fn: function to be called for each device. | |
1662 | * | |
1663 | * Iterate over devices in dpm_list, and call @fn for each device, | |
1664 | * passing it @data. | |
1665 | */ | |
1666 | void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) | |
1667 | { | |
1668 | struct device *dev; | |
1669 | ||
1670 | if (!fn) | |
1671 | return; | |
1672 | ||
1673 | device_pm_lock(); | |
1674 | list_for_each_entry(dev, &dpm_list, power.entry) | |
1675 | fn(dev, data); | |
1676 | device_pm_unlock(); | |
1677 | } | |
1678 | EXPORT_SYMBOL_GPL(dpm_for_each_dev); |