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