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1da177e4 LT |
1 | /* |
2 | * drivers/base/power/main.c - Where the driver meets power management. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * | |
10 | * The driver model core calls device_pm_add() when a device is registered. | |
b595076a | 11 | * This will initialize the embedded device_pm_info object in the device |
1da177e4 LT |
12 | * and add it to the list of power-controlled devices. sysfs entries for |
13 | * controlling device power management will also be added. | |
14 | * | |
1eede070 RW |
15 | * A separate list is used for keeping track of power info, because the power |
16 | * domain dependencies may differ from the ancestral dependencies that the | |
17 | * subsystem list maintains. | |
1da177e4 LT |
18 | */ |
19 | ||
1da177e4 | 20 | #include <linux/device.h> |
cd59abfc | 21 | #include <linux/kallsyms.h> |
1b6bc32f | 22 | #include <linux/export.h> |
11048dcf | 23 | #include <linux/mutex.h> |
cd59abfc | 24 | #include <linux/pm.h> |
5e928f77 | 25 | #include <linux/pm_runtime.h> |
431d452a | 26 | #include <linux/pm-trace.h> |
4990d4fe | 27 | #include <linux/pm_wakeirq.h> |
2ed8d2b3 | 28 | #include <linux/interrupt.h> |
f2511774 | 29 | #include <linux/sched.h> |
5af84b82 | 30 | #include <linux/async.h> |
1e75227e | 31 | #include <linux/suspend.h> |
53644677 | 32 | #include <trace/events/power.h> |
2f0aea93 | 33 | #include <linux/cpufreq.h> |
8651f97b | 34 | #include <linux/cpuidle.h> |
70fea60d BG |
35 | #include <linux/timer.h> |
36 | ||
cd59abfc | 37 | #include "../base.h" |
1da177e4 LT |
38 | #include "power.h" |
39 | ||
9cf519d1 RW |
40 | typedef int (*pm_callback_t)(struct device *); |
41 | ||
775b64d2 | 42 | /* |
1eede070 | 43 | * The entries in the dpm_list list are in a depth first order, simply |
775b64d2 RW |
44 | * because children are guaranteed to be discovered after parents, and |
45 | * are inserted at the back of the list on discovery. | |
46 | * | |
8e9394ce GKH |
47 | * Since device_pm_add() may be called with a device lock held, |
48 | * we must never try to acquire a device lock while holding | |
775b64d2 RW |
49 | * dpm_list_mutex. |
50 | */ | |
51 | ||
1eede070 | 52 | LIST_HEAD(dpm_list); |
7664e969 SK |
53 | static LIST_HEAD(dpm_prepared_list); |
54 | static LIST_HEAD(dpm_suspended_list); | |
55 | static LIST_HEAD(dpm_late_early_list); | |
56 | static LIST_HEAD(dpm_noirq_list); | |
1da177e4 | 57 | |
2a77c46d | 58 | struct suspend_stats suspend_stats; |
cd59abfc | 59 | static DEFINE_MUTEX(dpm_list_mtx); |
5af84b82 | 60 | static pm_message_t pm_transition; |
1da177e4 | 61 | |
098dff73 RW |
62 | static int async_error; |
63 | ||
53644677 SK |
64 | static char *pm_verb(int event) |
65 | { | |
66 | switch (event) { | |
67 | case PM_EVENT_SUSPEND: | |
68 | return "suspend"; | |
69 | case PM_EVENT_RESUME: | |
70 | return "resume"; | |
71 | case PM_EVENT_FREEZE: | |
72 | return "freeze"; | |
73 | case PM_EVENT_QUIESCE: | |
74 | return "quiesce"; | |
75 | case PM_EVENT_HIBERNATE: | |
76 | return "hibernate"; | |
77 | case PM_EVENT_THAW: | |
78 | return "thaw"; | |
79 | case PM_EVENT_RESTORE: | |
80 | return "restore"; | |
81 | case PM_EVENT_RECOVER: | |
82 | return "recover"; | |
83 | default: | |
84 | return "(unknown PM event)"; | |
85 | } | |
86 | } | |
87 | ||
5e928f77 | 88 | /** |
e91c11b1 | 89 | * device_pm_sleep_init - Initialize system suspend-related device fields. |
5e928f77 RW |
90 | * @dev: Device object being initialized. |
91 | */ | |
e91c11b1 | 92 | void device_pm_sleep_init(struct device *dev) |
5e928f77 | 93 | { |
f76b168b | 94 | dev->power.is_prepared = false; |
6d0e0e84 | 95 | dev->power.is_suspended = false; |
3d2699bc LC |
96 | dev->power.is_noirq_suspended = false; |
97 | dev->power.is_late_suspended = false; | |
5af84b82 | 98 | init_completion(&dev->power.completion); |
152e1d59 | 99 | complete_all(&dev->power.completion); |
074037ec | 100 | dev->power.wakeup = NULL; |
22110faf | 101 | INIT_LIST_HEAD(&dev->power.entry); |
5e928f77 RW |
102 | } |
103 | ||
1eede070 | 104 | /** |
20d652d7 | 105 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
106 | */ |
107 | void device_pm_lock(void) | |
108 | { | |
109 | mutex_lock(&dpm_list_mtx); | |
110 | } | |
111 | ||
112 | /** | |
20d652d7 | 113 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
114 | */ |
115 | void device_pm_unlock(void) | |
116 | { | |
117 | mutex_unlock(&dpm_list_mtx); | |
118 | } | |
075c1771 | 119 | |
775b64d2 | 120 | /** |
20d652d7 RW |
121 | * device_pm_add - Add a device to the PM core's list of active devices. |
122 | * @dev: Device to add to the list. | |
775b64d2 | 123 | */ |
3b98aeaf | 124 | void device_pm_add(struct device *dev) |
1da177e4 | 125 | { |
1da177e4 | 126 | pr_debug("PM: Adding info for %s:%s\n", |
5c1a07ab | 127 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
aa8e54b5 | 128 | device_pm_check_callbacks(dev); |
11048dcf | 129 | mutex_lock(&dpm_list_mtx); |
f76b168b | 130 | if (dev->parent && dev->parent->power.is_prepared) |
b64959e6 RW |
131 | dev_warn(dev, "parent %s should not be sleeping\n", |
132 | dev_name(dev->parent)); | |
3b98aeaf | 133 | list_add_tail(&dev->power.entry, &dpm_list); |
9ed98953 | 134 | dev->power.in_dpm_list = true; |
1a9a9152 | 135 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
136 | } |
137 | ||
775b64d2 | 138 | /** |
20d652d7 RW |
139 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
140 | * @dev: Device to be removed from the list. | |
775b64d2 | 141 | */ |
9cddad77 | 142 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
143 | { |
144 | pr_debug("PM: Removing info for %s:%s\n", | |
5c1a07ab | 145 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
5af84b82 | 146 | complete_all(&dev->power.completion); |
11048dcf | 147 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 148 | list_del_init(&dev->power.entry); |
9ed98953 | 149 | dev->power.in_dpm_list = false; |
11048dcf | 150 | mutex_unlock(&dpm_list_mtx); |
074037ec | 151 | device_wakeup_disable(dev); |
5e928f77 | 152 | pm_runtime_remove(dev); |
aa8e54b5 | 153 | device_pm_check_callbacks(dev); |
775b64d2 RW |
154 | } |
155 | ||
ffa6a705 | 156 | /** |
20d652d7 RW |
157 | * device_pm_move_before - Move device in the PM core's list of active devices. |
158 | * @deva: Device to move in dpm_list. | |
159 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
160 | */ |
161 | void device_pm_move_before(struct device *deva, struct device *devb) | |
162 | { | |
163 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
5c1a07ab RW |
164 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
165 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
166 | /* Delete deva from dpm_list and reinsert before devb. */ |
167 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
168 | } | |
169 | ||
170 | /** | |
20d652d7 RW |
171 | * device_pm_move_after - Move device in the PM core's list of active devices. |
172 | * @deva: Device to move in dpm_list. | |
173 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
174 | */ |
175 | void device_pm_move_after(struct device *deva, struct device *devb) | |
176 | { | |
177 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
5c1a07ab RW |
178 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
179 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
180 | /* Delete deva from dpm_list and reinsert after devb. */ |
181 | list_move(&deva->power.entry, &devb->power.entry); | |
182 | } | |
183 | ||
184 | /** | |
20d652d7 RW |
185 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
186 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
187 | */ |
188 | void device_pm_move_last(struct device *dev) | |
189 | { | |
190 | pr_debug("PM: Moving %s:%s to end of list\n", | |
5c1a07ab | 191 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
ffa6a705 CH |
192 | list_move_tail(&dev->power.entry, &dpm_list); |
193 | } | |
194 | ||
875ab0b7 RW |
195 | static ktime_t initcall_debug_start(struct device *dev) |
196 | { | |
8b0e1953 | 197 | ktime_t calltime = 0; |
875ab0b7 | 198 | |
b2df1d4f | 199 | if (pm_print_times_enabled) { |
0c6aebe3 RW |
200 | pr_info("calling %s+ @ %i, parent: %s\n", |
201 | dev_name(dev), task_pid_nr(current), | |
202 | dev->parent ? dev_name(dev->parent) : "none"); | |
875ab0b7 RW |
203 | calltime = ktime_get(); |
204 | } | |
205 | ||
206 | return calltime; | |
207 | } | |
208 | ||
209 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
53644677 | 210 | int error, pm_message_t state, char *info) |
875ab0b7 | 211 | { |
53644677 SK |
212 | ktime_t rettime; |
213 | s64 nsecs; | |
214 | ||
215 | rettime = ktime_get(); | |
216 | nsecs = (s64) ktime_to_ns(ktime_sub(rettime, calltime)); | |
875ab0b7 | 217 | |
b2df1d4f | 218 | if (pm_print_times_enabled) { |
875ab0b7 | 219 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), |
53644677 | 220 | error, (unsigned long long)nsecs >> 10); |
875ab0b7 RW |
221 | } |
222 | } | |
223 | ||
5af84b82 RW |
224 | /** |
225 | * dpm_wait - Wait for a PM operation to complete. | |
226 | * @dev: Device to wait for. | |
227 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
228 | */ | |
229 | static void dpm_wait(struct device *dev, bool async) | |
230 | { | |
231 | if (!dev) | |
232 | return; | |
233 | ||
0e06b4a8 | 234 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
235 | wait_for_completion(&dev->power.completion); |
236 | } | |
237 | ||
238 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
239 | { | |
240 | dpm_wait(dev, *((bool *)async_ptr)); | |
241 | return 0; | |
242 | } | |
243 | ||
244 | static void dpm_wait_for_children(struct device *dev, bool async) | |
245 | { | |
246 | device_for_each_child(dev, &async, dpm_wait_fn); | |
247 | } | |
248 | ||
8c73b428 RW |
249 | static void dpm_wait_for_suppliers(struct device *dev, bool async) |
250 | { | |
251 | struct device_link *link; | |
252 | int idx; | |
253 | ||
254 | idx = device_links_read_lock(); | |
255 | ||
256 | /* | |
257 | * If the supplier goes away right after we've checked the link to it, | |
258 | * we'll wait for its completion to change the state, but that's fine, | |
259 | * because the only things that will block as a result are the SRCU | |
260 | * callbacks freeing the link objects for the links in the list we're | |
261 | * walking. | |
262 | */ | |
263 | list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) | |
264 | if (READ_ONCE(link->status) != DL_STATE_DORMANT) | |
265 | dpm_wait(link->supplier, async); | |
266 | ||
267 | device_links_read_unlock(idx); | |
268 | } | |
269 | ||
270 | static void dpm_wait_for_superior(struct device *dev, bool async) | |
271 | { | |
272 | dpm_wait(dev->parent, async); | |
273 | dpm_wait_for_suppliers(dev, async); | |
274 | } | |
275 | ||
276 | static void dpm_wait_for_consumers(struct device *dev, bool async) | |
277 | { | |
278 | struct device_link *link; | |
279 | int idx; | |
280 | ||
281 | idx = device_links_read_lock(); | |
282 | ||
283 | /* | |
284 | * The status of a device link can only be changed from "dormant" by a | |
285 | * probe, but that cannot happen during system suspend/resume. In | |
286 | * theory it can change to "dormant" at that time, but then it is | |
287 | * reasonable to wait for the target device anyway (eg. if it goes | |
288 | * away, it's better to wait for it to go away completely and then | |
289 | * continue instead of trying to continue in parallel with its | |
290 | * unregistration). | |
291 | */ | |
292 | list_for_each_entry_rcu(link, &dev->links.consumers, s_node) | |
293 | if (READ_ONCE(link->status) != DL_STATE_DORMANT) | |
294 | dpm_wait(link->consumer, async); | |
295 | ||
296 | device_links_read_unlock(idx); | |
297 | } | |
298 | ||
299 | static void dpm_wait_for_subordinate(struct device *dev, bool async) | |
300 | { | |
301 | dpm_wait_for_children(dev, async); | |
302 | dpm_wait_for_consumers(dev, async); | |
303 | } | |
304 | ||
1eede070 | 305 | /** |
9cf519d1 | 306 | * pm_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
307 | * @ops: PM operations to choose from. |
308 | * @state: PM transition of the system being carried out. | |
1eede070 | 309 | */ |
9cf519d1 | 310 | static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 311 | { |
1eede070 RW |
312 | switch (state.event) { |
313 | #ifdef CONFIG_SUSPEND | |
314 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 315 | return ops->suspend; |
1eede070 | 316 | case PM_EVENT_RESUME: |
9cf519d1 | 317 | return ops->resume; |
1eede070 | 318 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 319 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
320 | case PM_EVENT_FREEZE: |
321 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 322 | return ops->freeze; |
1eede070 | 323 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 324 | return ops->poweroff; |
1eede070 RW |
325 | case PM_EVENT_THAW: |
326 | case PM_EVENT_RECOVER: | |
9cf519d1 | 327 | return ops->thaw; |
1eede070 RW |
328 | break; |
329 | case PM_EVENT_RESTORE: | |
9cf519d1 | 330 | return ops->restore; |
1f112cee | 331 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 332 | } |
f2511774 | 333 | |
9cf519d1 | 334 | return NULL; |
1eede070 RW |
335 | } |
336 | ||
cf579dfb RW |
337 | /** |
338 | * pm_late_early_op - Return the PM operation appropriate for given PM event. | |
339 | * @ops: PM operations to choose from. | |
340 | * @state: PM transition of the system being carried out. | |
341 | * | |
342 | * Runtime PM is disabled for @dev while this function is being executed. | |
343 | */ | |
344 | static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops, | |
345 | pm_message_t state) | |
346 | { | |
347 | switch (state.event) { | |
348 | #ifdef CONFIG_SUSPEND | |
349 | case PM_EVENT_SUSPEND: | |
350 | return ops->suspend_late; | |
351 | case PM_EVENT_RESUME: | |
352 | return ops->resume_early; | |
353 | #endif /* CONFIG_SUSPEND */ | |
354 | #ifdef CONFIG_HIBERNATE_CALLBACKS | |
355 | case PM_EVENT_FREEZE: | |
356 | case PM_EVENT_QUIESCE: | |
357 | return ops->freeze_late; | |
358 | case PM_EVENT_HIBERNATE: | |
359 | return ops->poweroff_late; | |
360 | case PM_EVENT_THAW: | |
361 | case PM_EVENT_RECOVER: | |
362 | return ops->thaw_early; | |
363 | case PM_EVENT_RESTORE: | |
364 | return ops->restore_early; | |
365 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ | |
366 | } | |
367 | ||
368 | return NULL; | |
369 | } | |
370 | ||
1eede070 | 371 | /** |
9cf519d1 | 372 | * pm_noirq_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
373 | * @ops: PM operations to choose from. |
374 | * @state: PM transition of the system being carried out. | |
1eede070 | 375 | * |
20d652d7 RW |
376 | * The driver of @dev will not receive interrupts while this function is being |
377 | * executed. | |
1eede070 | 378 | */ |
9cf519d1 | 379 | static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 380 | { |
1eede070 RW |
381 | switch (state.event) { |
382 | #ifdef CONFIG_SUSPEND | |
383 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 384 | return ops->suspend_noirq; |
1eede070 | 385 | case PM_EVENT_RESUME: |
9cf519d1 | 386 | return ops->resume_noirq; |
1eede070 | 387 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 388 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
389 | case PM_EVENT_FREEZE: |
390 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 391 | return ops->freeze_noirq; |
1eede070 | 392 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 393 | return ops->poweroff_noirq; |
1eede070 RW |
394 | case PM_EVENT_THAW: |
395 | case PM_EVENT_RECOVER: | |
9cf519d1 | 396 | return ops->thaw_noirq; |
1eede070 | 397 | case PM_EVENT_RESTORE: |
9cf519d1 | 398 | return ops->restore_noirq; |
1f112cee | 399 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 400 | } |
f2511774 | 401 | |
9cf519d1 | 402 | return NULL; |
1eede070 RW |
403 | } |
404 | ||
1eede070 RW |
405 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) |
406 | { | |
407 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
408 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
409 | ", may wakeup" : ""); | |
410 | } | |
411 | ||
412 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
413 | int error) | |
414 | { | |
415 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
5c1a07ab | 416 | dev_name(dev), pm_verb(state.event), info, error); |
1eede070 RW |
417 | } |
418 | ||
ecf762b2 RW |
419 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
420 | { | |
421 | ktime_t calltime; | |
0702d9ee | 422 | u64 usecs64; |
ecf762b2 RW |
423 | int usecs; |
424 | ||
425 | calltime = ktime_get(); | |
426 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
427 | do_div(usecs64, NSEC_PER_USEC); | |
428 | usecs = usecs64; | |
429 | if (usecs == 0) | |
430 | usecs = 1; | |
431 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
432 | info ?: "", info ? " " : "", pm_verb(state.event), | |
433 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
434 | } | |
435 | ||
9cf519d1 RW |
436 | static int dpm_run_callback(pm_callback_t cb, struct device *dev, |
437 | pm_message_t state, char *info) | |
438 | { | |
439 | ktime_t calltime; | |
440 | int error; | |
441 | ||
442 | if (!cb) | |
443 | return 0; | |
444 | ||
445 | calltime = initcall_debug_start(dev); | |
446 | ||
447 | pm_dev_dbg(dev, state, info); | |
e8bca479 | 448 | trace_device_pm_callback_start(dev, info, state.event); |
9cf519d1 | 449 | error = cb(dev); |
e8bca479 | 450 | trace_device_pm_callback_end(dev, error); |
9cf519d1 RW |
451 | suspend_report_result(cb, error); |
452 | ||
53644677 | 453 | initcall_debug_report(dev, calltime, error, state, info); |
9cf519d1 RW |
454 | |
455 | return error; | |
456 | } | |
457 | ||
70fea60d BG |
458 | #ifdef CONFIG_DPM_WATCHDOG |
459 | struct dpm_watchdog { | |
460 | struct device *dev; | |
461 | struct task_struct *tsk; | |
462 | struct timer_list timer; | |
463 | }; | |
464 | ||
465 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \ | |
466 | struct dpm_watchdog wd | |
467 | ||
468 | /** | |
469 | * dpm_watchdog_handler - Driver suspend / resume watchdog handler. | |
470 | * @data: Watchdog object address. | |
471 | * | |
472 | * Called when a driver has timed out suspending or resuming. | |
473 | * There's not much we can do here to recover so panic() to | |
474 | * capture a crash-dump in pstore. | |
475 | */ | |
476 | static void dpm_watchdog_handler(unsigned long data) | |
477 | { | |
478 | struct dpm_watchdog *wd = (void *)data; | |
479 | ||
480 | dev_emerg(wd->dev, "**** DPM device timeout ****\n"); | |
481 | show_stack(wd->tsk, NULL); | |
482 | panic("%s %s: unrecoverable failure\n", | |
483 | dev_driver_string(wd->dev), dev_name(wd->dev)); | |
484 | } | |
485 | ||
486 | /** | |
487 | * dpm_watchdog_set - Enable pm watchdog for given device. | |
488 | * @wd: Watchdog. Must be allocated on the stack. | |
489 | * @dev: Device to handle. | |
490 | */ | |
491 | static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev) | |
492 | { | |
493 | struct timer_list *timer = &wd->timer; | |
494 | ||
495 | wd->dev = dev; | |
496 | wd->tsk = current; | |
497 | ||
498 | init_timer_on_stack(timer); | |
499 | /* use same timeout value for both suspend and resume */ | |
500 | timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT; | |
501 | timer->function = dpm_watchdog_handler; | |
502 | timer->data = (unsigned long)wd; | |
503 | add_timer(timer); | |
504 | } | |
505 | ||
506 | /** | |
507 | * dpm_watchdog_clear - Disable suspend/resume watchdog. | |
508 | * @wd: Watchdog to disable. | |
509 | */ | |
510 | static void dpm_watchdog_clear(struct dpm_watchdog *wd) | |
511 | { | |
512 | struct timer_list *timer = &wd->timer; | |
513 | ||
514 | del_timer_sync(timer); | |
515 | destroy_timer_on_stack(timer); | |
516 | } | |
517 | #else | |
518 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) | |
519 | #define dpm_watchdog_set(x, y) | |
520 | #define dpm_watchdog_clear(x) | |
521 | #endif | |
522 | ||
cd59abfc AS |
523 | /*------------------------- Resume routines -------------------------*/ |
524 | ||
525 | /** | |
20d652d7 RW |
526 | * device_resume_noirq - Execute an "early resume" callback for given device. |
527 | * @dev: Device to handle. | |
528 | * @state: PM transition of the system being carried out. | |
58c256a3 | 529 | * @async: If true, the device is being resumed asynchronously. |
cd59abfc | 530 | * |
20d652d7 RW |
531 | * The driver of @dev will not receive interrupts while this function is being |
532 | * executed. | |
cd59abfc | 533 | */ |
76569faa | 534 | static int device_resume_noirq(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 535 | { |
9cf519d1 RW |
536 | pm_callback_t callback = NULL; |
537 | char *info = NULL; | |
cd59abfc AS |
538 | int error = 0; |
539 | ||
540 | TRACE_DEVICE(dev); | |
541 | TRACE_RESUME(0); | |
542 | ||
aae4518b | 543 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
544 | goto Out; |
545 | ||
3d2699bc LC |
546 | if (!dev->power.is_noirq_suspended) |
547 | goto Out; | |
548 | ||
8c73b428 | 549 | dpm_wait_for_superior(dev, async); |
76569faa | 550 | |
564b905a | 551 | if (dev->pm_domain) { |
cf579dfb | 552 | info = "noirq power domain "; |
9cf519d1 | 553 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 554 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 555 | info = "noirq type "; |
9cf519d1 | 556 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 557 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 558 | info = "noirq class "; |
9cf519d1 | 559 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 560 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 561 | info = "noirq bus "; |
9cf519d1 | 562 | callback = pm_noirq_op(dev->bus->pm, state); |
e7176a37 DB |
563 | } |
564 | ||
35cd133c | 565 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 566 | info = "noirq driver "; |
35cd133c RW |
567 | callback = pm_noirq_op(dev->driver->pm, state); |
568 | } | |
569 | ||
9cf519d1 | 570 | error = dpm_run_callback(callback, dev, state, info); |
3d2699bc | 571 | dev->power.is_noirq_suspended = false; |
9cf519d1 | 572 | |
dbf37414 | 573 | Out: |
76569faa | 574 | complete_all(&dev->power.completion); |
775b64d2 RW |
575 | TRACE_RESUME(error); |
576 | return error; | |
577 | } | |
578 | ||
76569faa LC |
579 | static bool is_async(struct device *dev) |
580 | { | |
581 | return dev->power.async_suspend && pm_async_enabled | |
582 | && !pm_trace_is_enabled(); | |
583 | } | |
584 | ||
585 | static void async_resume_noirq(void *data, async_cookie_t cookie) | |
586 | { | |
587 | struct device *dev = (struct device *)data; | |
588 | int error; | |
589 | ||
590 | error = device_resume_noirq(dev, pm_transition, true); | |
591 | if (error) | |
592 | pm_dev_err(dev, pm_transition, " async", error); | |
593 | ||
594 | put_device(dev); | |
595 | } | |
596 | ||
775b64d2 | 597 | /** |
cf579dfb | 598 | * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices. |
20d652d7 | 599 | * @state: PM transition of the system being carried out. |
775b64d2 | 600 | * |
cf579dfb | 601 | * Call the "noirq" resume handlers for all devices in dpm_noirq_list and |
20d652d7 | 602 | * enable device drivers to receive interrupts. |
775b64d2 | 603 | */ |
2a8a8ce6 | 604 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 605 | { |
76569faa | 606 | struct device *dev; |
ecf762b2 | 607 | ktime_t starttime = ktime_get(); |
775b64d2 | 608 | |
bb3632c6 | 609 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, true); |
32bdfac5 | 610 | mutex_lock(&dpm_list_mtx); |
76569faa | 611 | pm_transition = state; |
d08a5ace | 612 | |
76569faa LC |
613 | /* |
614 | * Advanced the async threads upfront, | |
615 | * in case the starting of async threads is | |
616 | * delayed by non-async resuming devices. | |
617 | */ | |
618 | list_for_each_entry(dev, &dpm_noirq_list, power.entry) { | |
619 | reinit_completion(&dev->power.completion); | |
620 | if (is_async(dev)) { | |
621 | get_device(dev); | |
622 | async_schedule(async_resume_noirq, dev); | |
623 | } | |
624 | } | |
625 | ||
626 | while (!list_empty(&dpm_noirq_list)) { | |
627 | dev = to_device(dpm_noirq_list.next); | |
d08a5ace | 628 | get_device(dev); |
cf579dfb | 629 | list_move_tail(&dev->power.entry, &dpm_late_early_list); |
5b219a51 | 630 | mutex_unlock(&dpm_list_mtx); |
d08a5ace | 631 | |
76569faa LC |
632 | if (!is_async(dev)) { |
633 | int error; | |
634 | ||
635 | error = device_resume_noirq(dev, state, false); | |
636 | if (error) { | |
637 | suspend_stats.failed_resume_noirq++; | |
638 | dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); | |
639 | dpm_save_failed_dev(dev_name(dev)); | |
640 | pm_dev_err(dev, state, " noirq", error); | |
641 | } | |
cf579dfb RW |
642 | } |
643 | ||
644 | mutex_lock(&dpm_list_mtx); | |
645 | put_device(dev); | |
646 | } | |
647 | mutex_unlock(&dpm_list_mtx); | |
76569faa | 648 | async_synchronize_full(); |
cf579dfb RW |
649 | dpm_show_time(starttime, state, "noirq"); |
650 | resume_device_irqs(); | |
4990d4fe | 651 | device_wakeup_disarm_wake_irqs(); |
8651f97b | 652 | cpuidle_resume(); |
bb3632c6 | 653 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false); |
cf579dfb RW |
654 | } |
655 | ||
656 | /** | |
657 | * device_resume_early - Execute an "early resume" callback for given device. | |
658 | * @dev: Device to handle. | |
659 | * @state: PM transition of the system being carried out. | |
58c256a3 | 660 | * @async: If true, the device is being resumed asynchronously. |
cf579dfb RW |
661 | * |
662 | * Runtime PM is disabled for @dev while this function is being executed. | |
663 | */ | |
9e5e7910 | 664 | static int device_resume_early(struct device *dev, pm_message_t state, bool async) |
cf579dfb RW |
665 | { |
666 | pm_callback_t callback = NULL; | |
667 | char *info = NULL; | |
668 | int error = 0; | |
669 | ||
670 | TRACE_DEVICE(dev); | |
671 | TRACE_RESUME(0); | |
672 | ||
aae4518b | 673 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
674 | goto Out; |
675 | ||
3d2699bc LC |
676 | if (!dev->power.is_late_suspended) |
677 | goto Out; | |
678 | ||
8c73b428 | 679 | dpm_wait_for_superior(dev, async); |
9e5e7910 | 680 | |
cf579dfb RW |
681 | if (dev->pm_domain) { |
682 | info = "early power domain "; | |
683 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
684 | } else if (dev->type && dev->type->pm) { | |
685 | info = "early type "; | |
686 | callback = pm_late_early_op(dev->type->pm, state); | |
687 | } else if (dev->class && dev->class->pm) { | |
688 | info = "early class "; | |
689 | callback = pm_late_early_op(dev->class->pm, state); | |
690 | } else if (dev->bus && dev->bus->pm) { | |
691 | info = "early bus "; | |
692 | callback = pm_late_early_op(dev->bus->pm, state); | |
693 | } | |
694 | ||
695 | if (!callback && dev->driver && dev->driver->pm) { | |
696 | info = "early driver "; | |
697 | callback = pm_late_early_op(dev->driver->pm, state); | |
698 | } | |
699 | ||
700 | error = dpm_run_callback(callback, dev, state, info); | |
3d2699bc | 701 | dev->power.is_late_suspended = false; |
cf579dfb | 702 | |
dbf37414 | 703 | Out: |
cf579dfb | 704 | TRACE_RESUME(error); |
9f6d8f6a RW |
705 | |
706 | pm_runtime_enable(dev); | |
9e5e7910 | 707 | complete_all(&dev->power.completion); |
cf579dfb RW |
708 | return error; |
709 | } | |
710 | ||
9e5e7910 LC |
711 | static void async_resume_early(void *data, async_cookie_t cookie) |
712 | { | |
713 | struct device *dev = (struct device *)data; | |
714 | int error; | |
715 | ||
716 | error = device_resume_early(dev, pm_transition, true); | |
717 | if (error) | |
718 | pm_dev_err(dev, pm_transition, " async", error); | |
719 | ||
720 | put_device(dev); | |
721 | } | |
722 | ||
cf579dfb RW |
723 | /** |
724 | * dpm_resume_early - Execute "early resume" callbacks for all devices. | |
725 | * @state: PM transition of the system being carried out. | |
726 | */ | |
2a8a8ce6 | 727 | void dpm_resume_early(pm_message_t state) |
cf579dfb | 728 | { |
9e5e7910 | 729 | struct device *dev; |
cf579dfb RW |
730 | ktime_t starttime = ktime_get(); |
731 | ||
bb3632c6 | 732 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, true); |
cf579dfb | 733 | mutex_lock(&dpm_list_mtx); |
9e5e7910 LC |
734 | pm_transition = state; |
735 | ||
736 | /* | |
737 | * Advanced the async threads upfront, | |
738 | * in case the starting of async threads is | |
739 | * delayed by non-async resuming devices. | |
740 | */ | |
741 | list_for_each_entry(dev, &dpm_late_early_list, power.entry) { | |
742 | reinit_completion(&dev->power.completion); | |
743 | if (is_async(dev)) { | |
744 | get_device(dev); | |
745 | async_schedule(async_resume_early, dev); | |
746 | } | |
747 | } | |
cf579dfb | 748 | |
9e5e7910 LC |
749 | while (!list_empty(&dpm_late_early_list)) { |
750 | dev = to_device(dpm_late_early_list.next); | |
cf579dfb RW |
751 | get_device(dev); |
752 | list_move_tail(&dev->power.entry, &dpm_suspended_list); | |
753 | mutex_unlock(&dpm_list_mtx); | |
754 | ||
9e5e7910 LC |
755 | if (!is_async(dev)) { |
756 | int error; | |
d08a5ace | 757 | |
9e5e7910 LC |
758 | error = device_resume_early(dev, state, false); |
759 | if (error) { | |
760 | suspend_stats.failed_resume_early++; | |
761 | dpm_save_failed_step(SUSPEND_RESUME_EARLY); | |
762 | dpm_save_failed_dev(dev_name(dev)); | |
763 | pm_dev_err(dev, state, " early", error); | |
764 | } | |
765 | } | |
5b219a51 | 766 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
767 | put_device(dev); |
768 | } | |
32bdfac5 | 769 | mutex_unlock(&dpm_list_mtx); |
9e5e7910 | 770 | async_synchronize_full(); |
ecf762b2 | 771 | dpm_show_time(starttime, state, "early"); |
bb3632c6 | 772 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, false); |
775b64d2 | 773 | } |
cf579dfb RW |
774 | |
775 | /** | |
776 | * dpm_resume_start - Execute "noirq" and "early" device callbacks. | |
777 | * @state: PM transition of the system being carried out. | |
778 | */ | |
779 | void dpm_resume_start(pm_message_t state) | |
780 | { | |
781 | dpm_resume_noirq(state); | |
782 | dpm_resume_early(state); | |
783 | } | |
784 | EXPORT_SYMBOL_GPL(dpm_resume_start); | |
775b64d2 RW |
785 | |
786 | /** | |
97df8c12 | 787 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
788 | * @dev: Device to handle. |
789 | * @state: PM transition of the system being carried out. | |
5af84b82 | 790 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 791 | */ |
97df8c12 | 792 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 793 | { |
9cf519d1 RW |
794 | pm_callback_t callback = NULL; |
795 | char *info = NULL; | |
775b64d2 | 796 | int error = 0; |
70fea60d | 797 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
775b64d2 RW |
798 | |
799 | TRACE_DEVICE(dev); | |
800 | TRACE_RESUME(0); | |
cd59abfc | 801 | |
dbf37414 RW |
802 | if (dev->power.syscore) |
803 | goto Complete; | |
804 | ||
aae4518b RW |
805 | if (dev->power.direct_complete) { |
806 | /* Match the pm_runtime_disable() in __device_suspend(). */ | |
807 | pm_runtime_enable(dev); | |
808 | goto Complete; | |
809 | } | |
810 | ||
8c73b428 | 811 | dpm_wait_for_superior(dev, async); |
70fea60d | 812 | dpm_watchdog_set(&wd, dev); |
8e9394ce | 813 | device_lock(dev); |
7a8d37a3 | 814 | |
f76b168b AS |
815 | /* |
816 | * This is a fib. But we'll allow new children to be added below | |
817 | * a resumed device, even if the device hasn't been completed yet. | |
818 | */ | |
819 | dev->power.is_prepared = false; | |
97df8c12 | 820 | |
6d0e0e84 AS |
821 | if (!dev->power.is_suspended) |
822 | goto Unlock; | |
823 | ||
564b905a | 824 | if (dev->pm_domain) { |
9cf519d1 RW |
825 | info = "power domain "; |
826 | callback = pm_op(&dev->pm_domain->ops, state); | |
35cd133c | 827 | goto Driver; |
7538e3db RW |
828 | } |
829 | ||
9659cc06 | 830 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
831 | info = "type "; |
832 | callback = pm_op(dev->type->pm, state); | |
35cd133c | 833 | goto Driver; |
cd59abfc AS |
834 | } |
835 | ||
1eede070 RW |
836 | if (dev->class) { |
837 | if (dev->class->pm) { | |
9cf519d1 RW |
838 | info = "class "; |
839 | callback = pm_op(dev->class->pm, state); | |
35cd133c | 840 | goto Driver; |
1eede070 | 841 | } else if (dev->class->resume) { |
9cf519d1 RW |
842 | info = "legacy class "; |
843 | callback = dev->class->resume; | |
9659cc06 | 844 | goto End; |
1eede070 | 845 | } |
cd59abfc | 846 | } |
9659cc06 RW |
847 | |
848 | if (dev->bus) { | |
849 | if (dev->bus->pm) { | |
35cd133c | 850 | info = "bus "; |
9cf519d1 | 851 | callback = pm_op(dev->bus->pm, state); |
9659cc06 | 852 | } else if (dev->bus->resume) { |
35cd133c | 853 | info = "legacy bus "; |
9cf519d1 | 854 | callback = dev->bus->resume; |
35cd133c | 855 | goto End; |
9659cc06 RW |
856 | } |
857 | } | |
858 | ||
35cd133c RW |
859 | Driver: |
860 | if (!callback && dev->driver && dev->driver->pm) { | |
861 | info = "driver "; | |
862 | callback = pm_op(dev->driver->pm, state); | |
863 | } | |
864 | ||
1eede070 | 865 | End: |
9cf519d1 | 866 | error = dpm_run_callback(callback, dev, state, info); |
6d0e0e84 AS |
867 | dev->power.is_suspended = false; |
868 | ||
869 | Unlock: | |
8e9394ce | 870 | device_unlock(dev); |
70fea60d | 871 | dpm_watchdog_clear(&wd); |
dbf37414 RW |
872 | |
873 | Complete: | |
5af84b82 | 874 | complete_all(&dev->power.completion); |
7a8d37a3 | 875 | |
cd59abfc | 876 | TRACE_RESUME(error); |
1e2ef05b | 877 | |
cd59abfc AS |
878 | return error; |
879 | } | |
880 | ||
5af84b82 RW |
881 | static void async_resume(void *data, async_cookie_t cookie) |
882 | { | |
883 | struct device *dev = (struct device *)data; | |
884 | int error; | |
885 | ||
97df8c12 | 886 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
887 | if (error) |
888 | pm_dev_err(dev, pm_transition, " async", error); | |
889 | put_device(dev); | |
890 | } | |
891 | ||
775b64d2 | 892 | /** |
20d652d7 RW |
893 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
894 | * @state: PM transition of the system being carried out. | |
775b64d2 | 895 | * |
20d652d7 RW |
896 | * Execute the appropriate "resume" callback for all devices whose status |
897 | * indicates that they are suspended. | |
1eede070 | 898 | */ |
91e7c75b | 899 | void dpm_resume(pm_message_t state) |
1eede070 | 900 | { |
97df8c12 | 901 | struct device *dev; |
ecf762b2 | 902 | ktime_t starttime = ktime_get(); |
1eede070 | 903 | |
bb3632c6 | 904 | trace_suspend_resume(TPS("dpm_resume"), state.event, true); |
91e7c75b RW |
905 | might_sleep(); |
906 | ||
1eede070 | 907 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 908 | pm_transition = state; |
098dff73 | 909 | async_error = 0; |
1eede070 | 910 | |
8a43a9ab | 911 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
16735d02 | 912 | reinit_completion(&dev->power.completion); |
97df8c12 RW |
913 | if (is_async(dev)) { |
914 | get_device(dev); | |
915 | async_schedule(async_resume, dev); | |
916 | } | |
917 | } | |
918 | ||
8a43a9ab RW |
919 | while (!list_empty(&dpm_suspended_list)) { |
920 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 921 | get_device(dev); |
5b219a51 | 922 | if (!is_async(dev)) { |
1eede070 RW |
923 | int error; |
924 | ||
1eede070 RW |
925 | mutex_unlock(&dpm_list_mtx); |
926 | ||
97df8c12 | 927 | error = device_resume(dev, state, false); |
2a77c46d SL |
928 | if (error) { |
929 | suspend_stats.failed_resume++; | |
930 | dpm_save_failed_step(SUSPEND_RESUME); | |
931 | dpm_save_failed_dev(dev_name(dev)); | |
1eede070 | 932 | pm_dev_err(dev, state, "", error); |
2a77c46d | 933 | } |
5b219a51 RW |
934 | |
935 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
936 | } |
937 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 938 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
939 | put_device(dev); |
940 | } | |
1eede070 | 941 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 942 | async_synchronize_full(); |
ecf762b2 | 943 | dpm_show_time(starttime, state, NULL); |
2f0aea93 VK |
944 | |
945 | cpufreq_resume(); | |
bb3632c6 | 946 | trace_suspend_resume(TPS("dpm_resume"), state.event, false); |
1eede070 RW |
947 | } |
948 | ||
949 | /** | |
20d652d7 RW |
950 | * device_complete - Complete a PM transition for given device. |
951 | * @dev: Device to handle. | |
952 | * @state: PM transition of the system being carried out. | |
1eede070 | 953 | */ |
d1616302 | 954 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 955 | { |
35cd133c RW |
956 | void (*callback)(struct device *) = NULL; |
957 | char *info = NULL; | |
958 | ||
dbf37414 RW |
959 | if (dev->power.syscore) |
960 | return; | |
961 | ||
8e9394ce | 962 | device_lock(dev); |
1eede070 | 963 | |
564b905a | 964 | if (dev->pm_domain) { |
35cd133c RW |
965 | info = "completing power domain "; |
966 | callback = dev->pm_domain->ops.complete; | |
4d27e9dc | 967 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
968 | info = "completing type "; |
969 | callback = dev->type->pm->complete; | |
9659cc06 | 970 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
971 | info = "completing class "; |
972 | callback = dev->class->pm->complete; | |
9659cc06 | 973 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
974 | info = "completing bus "; |
975 | callback = dev->bus->pm->complete; | |
976 | } | |
977 | ||
978 | if (!callback && dev->driver && dev->driver->pm) { | |
979 | info = "completing driver "; | |
980 | callback = dev->driver->pm->complete; | |
981 | } | |
982 | ||
983 | if (callback) { | |
984 | pm_dev_dbg(dev, state, info); | |
985 | callback(dev); | |
1eede070 RW |
986 | } |
987 | ||
8e9394ce | 988 | device_unlock(dev); |
88d26136 | 989 | |
af939339 | 990 | pm_runtime_put(dev); |
1eede070 RW |
991 | } |
992 | ||
993 | /** | |
20d652d7 RW |
994 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
995 | * @state: PM transition of the system being carried out. | |
775b64d2 | 996 | * |
20d652d7 RW |
997 | * Execute the ->complete() callbacks for all devices whose PM status is not |
998 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 999 | */ |
91e7c75b | 1000 | void dpm_complete(pm_message_t state) |
cd59abfc | 1001 | { |
1eede070 RW |
1002 | struct list_head list; |
1003 | ||
bb3632c6 | 1004 | trace_suspend_resume(TPS("dpm_complete"), state.event, true); |
91e7c75b RW |
1005 | might_sleep(); |
1006 | ||
1eede070 | 1007 | INIT_LIST_HEAD(&list); |
cd59abfc | 1008 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
1009 | while (!list_empty(&dpm_prepared_list)) { |
1010 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 1011 | |
1eede070 | 1012 | get_device(dev); |
f76b168b | 1013 | dev->power.is_prepared = false; |
5b219a51 RW |
1014 | list_move(&dev->power.entry, &list); |
1015 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 1016 | |
32e8d689 | 1017 | trace_device_pm_callback_start(dev, "", state.event); |
5b219a51 | 1018 | device_complete(dev, state); |
32e8d689 | 1019 | trace_device_pm_callback_end(dev, 0); |
1eede070 | 1020 | |
5b219a51 | 1021 | mutex_lock(&dpm_list_mtx); |
1eede070 | 1022 | put_device(dev); |
cd59abfc | 1023 | } |
1eede070 | 1024 | list_splice(&list, &dpm_list); |
cd59abfc | 1025 | mutex_unlock(&dpm_list_mtx); |
013c074f SG |
1026 | |
1027 | /* Allow device probing and trigger re-probing of deferred devices */ | |
1028 | device_unblock_probing(); | |
bb3632c6 | 1029 | trace_suspend_resume(TPS("dpm_complete"), state.event, false); |
cd59abfc AS |
1030 | } |
1031 | ||
cd59abfc | 1032 | /** |
20d652d7 RW |
1033 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
1034 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1035 | * |
20d652d7 RW |
1036 | * Execute "resume" callbacks for all devices and complete the PM transition of |
1037 | * the system. | |
cd59abfc | 1038 | */ |
d1616302 | 1039 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 1040 | { |
1eede070 RW |
1041 | dpm_resume(state); |
1042 | dpm_complete(state); | |
cd59abfc | 1043 | } |
d1616302 | 1044 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
1045 | |
1046 | ||
1047 | /*------------------------- Suspend routines -------------------------*/ | |
1048 | ||
1eede070 | 1049 | /** |
20d652d7 RW |
1050 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
1051 | * @sleep_state: PM message representing a sleep state. | |
1052 | * | |
1053 | * Return a PM message representing the resume event corresponding to given | |
1054 | * sleep state. | |
1eede070 RW |
1055 | */ |
1056 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 1057 | { |
1eede070 RW |
1058 | switch (sleep_state.event) { |
1059 | case PM_EVENT_SUSPEND: | |
1060 | return PMSG_RESUME; | |
1061 | case PM_EVENT_FREEZE: | |
1062 | case PM_EVENT_QUIESCE: | |
1063 | return PMSG_RECOVER; | |
1064 | case PM_EVENT_HIBERNATE: | |
1065 | return PMSG_RESTORE; | |
cd59abfc | 1066 | } |
1eede070 | 1067 | return PMSG_ON; |
cd59abfc AS |
1068 | } |
1069 | ||
1070 | /** | |
20d652d7 RW |
1071 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
1072 | * @dev: Device to handle. | |
1073 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1074 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1075 | * |
20d652d7 RW |
1076 | * The driver of @dev will not receive interrupts while this function is being |
1077 | * executed. | |
cd59abfc | 1078 | */ |
28b6fd6e | 1079 | static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 1080 | { |
9cf519d1 RW |
1081 | pm_callback_t callback = NULL; |
1082 | char *info = NULL; | |
28b6fd6e LC |
1083 | int error = 0; |
1084 | ||
431d452a ZF |
1085 | TRACE_DEVICE(dev); |
1086 | TRACE_SUSPEND(0); | |
1087 | ||
098c3055 | 1088 | dpm_wait_for_subordinate(dev, async); |
6f75c3fd | 1089 | |
28b6fd6e LC |
1090 | if (async_error) |
1091 | goto Complete; | |
1092 | ||
1093 | if (pm_wakeup_pending()) { | |
1094 | async_error = -EBUSY; | |
1095 | goto Complete; | |
1096 | } | |
e7176a37 | 1097 | |
aae4518b | 1098 | if (dev->power.syscore || dev->power.direct_complete) |
28b6fd6e LC |
1099 | goto Complete; |
1100 | ||
564b905a | 1101 | if (dev->pm_domain) { |
cf579dfb | 1102 | info = "noirq power domain "; |
9cf519d1 | 1103 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 1104 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 1105 | info = "noirq type "; |
9cf519d1 | 1106 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 1107 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 1108 | info = "noirq class "; |
9cf519d1 | 1109 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 1110 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 1111 | info = "noirq bus "; |
9cf519d1 | 1112 | callback = pm_noirq_op(dev->bus->pm, state); |
7538e3db RW |
1113 | } |
1114 | ||
35cd133c | 1115 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 1116 | info = "noirq driver "; |
35cd133c RW |
1117 | callback = pm_noirq_op(dev->driver->pm, state); |
1118 | } | |
1119 | ||
3d2699bc LC |
1120 | error = dpm_run_callback(callback, dev, state, info); |
1121 | if (!error) | |
1122 | dev->power.is_noirq_suspended = true; | |
28b6fd6e LC |
1123 | else |
1124 | async_error = error; | |
3d2699bc | 1125 | |
28b6fd6e LC |
1126 | Complete: |
1127 | complete_all(&dev->power.completion); | |
431d452a | 1128 | TRACE_SUSPEND(error); |
3d2699bc | 1129 | return error; |
775b64d2 RW |
1130 | } |
1131 | ||
28b6fd6e LC |
1132 | static void async_suspend_noirq(void *data, async_cookie_t cookie) |
1133 | { | |
1134 | struct device *dev = (struct device *)data; | |
1135 | int error; | |
1136 | ||
1137 | error = __device_suspend_noirq(dev, pm_transition, true); | |
1138 | if (error) { | |
1139 | dpm_save_failed_dev(dev_name(dev)); | |
1140 | pm_dev_err(dev, pm_transition, " async", error); | |
1141 | } | |
1142 | ||
1143 | put_device(dev); | |
1144 | } | |
1145 | ||
1146 | static int device_suspend_noirq(struct device *dev) | |
1147 | { | |
1148 | reinit_completion(&dev->power.completion); | |
1149 | ||
431d452a | 1150 | if (is_async(dev)) { |
28b6fd6e LC |
1151 | get_device(dev); |
1152 | async_schedule(async_suspend_noirq, dev); | |
1153 | return 0; | |
1154 | } | |
1155 | return __device_suspend_noirq(dev, pm_transition, false); | |
1156 | } | |
1157 | ||
775b64d2 | 1158 | /** |
cf579dfb | 1159 | * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices. |
20d652d7 | 1160 | * @state: PM transition of the system being carried out. |
775b64d2 | 1161 | * |
20d652d7 RW |
1162 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
1163 | * handlers for all non-sysdev devices. | |
775b64d2 | 1164 | */ |
2a8a8ce6 | 1165 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 1166 | { |
ecf762b2 | 1167 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
1168 | int error = 0; |
1169 | ||
bb3632c6 | 1170 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true); |
8651f97b | 1171 | cpuidle_pause(); |
4990d4fe | 1172 | device_wakeup_arm_wake_irqs(); |
2ed8d2b3 | 1173 | suspend_device_irqs(); |
32bdfac5 | 1174 | mutex_lock(&dpm_list_mtx); |
28b6fd6e LC |
1175 | pm_transition = state; |
1176 | async_error = 0; | |
1177 | ||
cf579dfb RW |
1178 | while (!list_empty(&dpm_late_early_list)) { |
1179 | struct device *dev = to_device(dpm_late_early_list.prev); | |
d08a5ace RW |
1180 | |
1181 | get_device(dev); | |
1182 | mutex_unlock(&dpm_list_mtx); | |
1183 | ||
28b6fd6e | 1184 | error = device_suspend_noirq(dev); |
d08a5ace RW |
1185 | |
1186 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 1187 | if (error) { |
cf579dfb | 1188 | pm_dev_err(dev, state, " noirq", error); |
2a77c46d | 1189 | dpm_save_failed_dev(dev_name(dev)); |
d08a5ace | 1190 | put_device(dev); |
775b64d2 RW |
1191 | break; |
1192 | } | |
d08a5ace | 1193 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1194 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 1195 | put_device(dev); |
52d136cc | 1196 | |
28b6fd6e | 1197 | if (async_error) |
52d136cc | 1198 | break; |
775b64d2 | 1199 | } |
32bdfac5 | 1200 | mutex_unlock(&dpm_list_mtx); |
28b6fd6e LC |
1201 | async_synchronize_full(); |
1202 | if (!error) | |
1203 | error = async_error; | |
1204 | ||
1205 | if (error) { | |
1206 | suspend_stats.failed_suspend_noirq++; | |
1207 | dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); | |
d1616302 | 1208 | dpm_resume_noirq(resume_event(state)); |
28b6fd6e | 1209 | } else { |
cf579dfb | 1210 | dpm_show_time(starttime, state, "noirq"); |
28b6fd6e | 1211 | } |
bb3632c6 | 1212 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false); |
cf579dfb RW |
1213 | return error; |
1214 | } | |
1215 | ||
1216 | /** | |
1217 | * device_suspend_late - Execute a "late suspend" callback for given device. | |
1218 | * @dev: Device to handle. | |
1219 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1220 | * @async: If true, the device is being suspended asynchronously. |
cf579dfb RW |
1221 | * |
1222 | * Runtime PM is disabled for @dev while this function is being executed. | |
1223 | */ | |
de377b39 | 1224 | static int __device_suspend_late(struct device *dev, pm_message_t state, bool async) |
cf579dfb RW |
1225 | { |
1226 | pm_callback_t callback = NULL; | |
1227 | char *info = NULL; | |
de377b39 | 1228 | int error = 0; |
cf579dfb | 1229 | |
431d452a ZF |
1230 | TRACE_DEVICE(dev); |
1231 | TRACE_SUSPEND(0); | |
1232 | ||
9f6d8f6a RW |
1233 | __pm_runtime_disable(dev, false); |
1234 | ||
098c3055 | 1235 | dpm_wait_for_subordinate(dev, async); |
6f75c3fd | 1236 | |
de377b39 LC |
1237 | if (async_error) |
1238 | goto Complete; | |
1239 | ||
1240 | if (pm_wakeup_pending()) { | |
1241 | async_error = -EBUSY; | |
1242 | goto Complete; | |
1243 | } | |
1244 | ||
aae4518b | 1245 | if (dev->power.syscore || dev->power.direct_complete) |
de377b39 LC |
1246 | goto Complete; |
1247 | ||
cf579dfb RW |
1248 | if (dev->pm_domain) { |
1249 | info = "late power domain "; | |
1250 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
1251 | } else if (dev->type && dev->type->pm) { | |
1252 | info = "late type "; | |
1253 | callback = pm_late_early_op(dev->type->pm, state); | |
1254 | } else if (dev->class && dev->class->pm) { | |
1255 | info = "late class "; | |
1256 | callback = pm_late_early_op(dev->class->pm, state); | |
1257 | } else if (dev->bus && dev->bus->pm) { | |
1258 | info = "late bus "; | |
1259 | callback = pm_late_early_op(dev->bus->pm, state); | |
1260 | } | |
1261 | ||
1262 | if (!callback && dev->driver && dev->driver->pm) { | |
1263 | info = "late driver "; | |
1264 | callback = pm_late_early_op(dev->driver->pm, state); | |
1265 | } | |
1266 | ||
3d2699bc LC |
1267 | error = dpm_run_callback(callback, dev, state, info); |
1268 | if (!error) | |
1269 | dev->power.is_late_suspended = true; | |
de377b39 LC |
1270 | else |
1271 | async_error = error; | |
3d2699bc | 1272 | |
de377b39 | 1273 | Complete: |
431d452a | 1274 | TRACE_SUSPEND(error); |
de377b39 | 1275 | complete_all(&dev->power.completion); |
3d2699bc | 1276 | return error; |
cf579dfb RW |
1277 | } |
1278 | ||
de377b39 LC |
1279 | static void async_suspend_late(void *data, async_cookie_t cookie) |
1280 | { | |
1281 | struct device *dev = (struct device *)data; | |
1282 | int error; | |
1283 | ||
1284 | error = __device_suspend_late(dev, pm_transition, true); | |
1285 | if (error) { | |
1286 | dpm_save_failed_dev(dev_name(dev)); | |
1287 | pm_dev_err(dev, pm_transition, " async", error); | |
1288 | } | |
1289 | put_device(dev); | |
1290 | } | |
1291 | ||
1292 | static int device_suspend_late(struct device *dev) | |
1293 | { | |
1294 | reinit_completion(&dev->power.completion); | |
1295 | ||
431d452a | 1296 | if (is_async(dev)) { |
de377b39 LC |
1297 | get_device(dev); |
1298 | async_schedule(async_suspend_late, dev); | |
1299 | return 0; | |
1300 | } | |
1301 | ||
1302 | return __device_suspend_late(dev, pm_transition, false); | |
1303 | } | |
1304 | ||
cf579dfb RW |
1305 | /** |
1306 | * dpm_suspend_late - Execute "late suspend" callbacks for all devices. | |
1307 | * @state: PM transition of the system being carried out. | |
1308 | */ | |
2a8a8ce6 | 1309 | int dpm_suspend_late(pm_message_t state) |
cf579dfb RW |
1310 | { |
1311 | ktime_t starttime = ktime_get(); | |
1312 | int error = 0; | |
1313 | ||
bb3632c6 | 1314 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, true); |
cf579dfb | 1315 | mutex_lock(&dpm_list_mtx); |
de377b39 LC |
1316 | pm_transition = state; |
1317 | async_error = 0; | |
1318 | ||
cf579dfb RW |
1319 | while (!list_empty(&dpm_suspended_list)) { |
1320 | struct device *dev = to_device(dpm_suspended_list.prev); | |
1321 | ||
1322 | get_device(dev); | |
1323 | mutex_unlock(&dpm_list_mtx); | |
1324 | ||
de377b39 | 1325 | error = device_suspend_late(dev); |
cf579dfb RW |
1326 | |
1327 | mutex_lock(&dpm_list_mtx); | |
3a17fb32 RW |
1328 | if (!list_empty(&dev->power.entry)) |
1329 | list_move(&dev->power.entry, &dpm_late_early_list); | |
1330 | ||
cf579dfb RW |
1331 | if (error) { |
1332 | pm_dev_err(dev, state, " late", error); | |
cf579dfb RW |
1333 | dpm_save_failed_dev(dev_name(dev)); |
1334 | put_device(dev); | |
1335 | break; | |
1336 | } | |
cf579dfb | 1337 | put_device(dev); |
52d136cc | 1338 | |
de377b39 | 1339 | if (async_error) |
52d136cc | 1340 | break; |
cf579dfb RW |
1341 | } |
1342 | mutex_unlock(&dpm_list_mtx); | |
de377b39 | 1343 | async_synchronize_full(); |
246ef766 ID |
1344 | if (!error) |
1345 | error = async_error; | |
de377b39 LC |
1346 | if (error) { |
1347 | suspend_stats.failed_suspend_late++; | |
1348 | dpm_save_failed_step(SUSPEND_SUSPEND_LATE); | |
cf579dfb | 1349 | dpm_resume_early(resume_event(state)); |
de377b39 | 1350 | } else { |
ecf762b2 | 1351 | dpm_show_time(starttime, state, "late"); |
de377b39 | 1352 | } |
bb3632c6 | 1353 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false); |
775b64d2 RW |
1354 | return error; |
1355 | } | |
cf579dfb RW |
1356 | |
1357 | /** | |
1358 | * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks. | |
1359 | * @state: PM transition of the system being carried out. | |
1360 | */ | |
1361 | int dpm_suspend_end(pm_message_t state) | |
1362 | { | |
1363 | int error = dpm_suspend_late(state); | |
064b021f CC |
1364 | if (error) |
1365 | return error; | |
1366 | ||
1367 | error = dpm_suspend_noirq(state); | |
1368 | if (error) { | |
997a0311 | 1369 | dpm_resume_early(resume_event(state)); |
064b021f CC |
1370 | return error; |
1371 | } | |
cf579dfb | 1372 | |
064b021f | 1373 | return 0; |
cf579dfb RW |
1374 | } |
1375 | EXPORT_SYMBOL_GPL(dpm_suspend_end); | |
775b64d2 | 1376 | |
875ab0b7 RW |
1377 | /** |
1378 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
1379 | * @dev: Device to suspend. |
1380 | * @state: PM transition of the system being carried out. | |
1381 | * @cb: Suspend callback to execute. | |
58c256a3 | 1382 | * @info: string description of caller. |
875ab0b7 RW |
1383 | */ |
1384 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
53644677 SK |
1385 | int (*cb)(struct device *dev, pm_message_t state), |
1386 | char *info) | |
875ab0b7 RW |
1387 | { |
1388 | int error; | |
1389 | ktime_t calltime; | |
1390 | ||
1391 | calltime = initcall_debug_start(dev); | |
1392 | ||
e8bca479 | 1393 | trace_device_pm_callback_start(dev, info, state.event); |
875ab0b7 | 1394 | error = cb(dev, state); |
e8bca479 | 1395 | trace_device_pm_callback_end(dev, error); |
875ab0b7 RW |
1396 | suspend_report_result(cb, error); |
1397 | ||
53644677 | 1398 | initcall_debug_report(dev, calltime, error, state, info); |
875ab0b7 RW |
1399 | |
1400 | return error; | |
1401 | } | |
1402 | ||
8c73b428 RW |
1403 | static void dpm_clear_suppliers_direct_complete(struct device *dev) |
1404 | { | |
1405 | struct device_link *link; | |
1406 | int idx; | |
1407 | ||
1408 | idx = device_links_read_lock(); | |
1409 | ||
1410 | list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) { | |
1411 | spin_lock_irq(&link->supplier->power.lock); | |
1412 | link->supplier->power.direct_complete = false; | |
1413 | spin_unlock_irq(&link->supplier->power.lock); | |
1414 | } | |
1415 | ||
1416 | device_links_read_unlock(idx); | |
1417 | } | |
1418 | ||
775b64d2 | 1419 | /** |
20d652d7 RW |
1420 | * device_suspend - Execute "suspend" callbacks for given device. |
1421 | * @dev: Device to handle. | |
1422 | * @state: PM transition of the system being carried out. | |
5af84b82 | 1423 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1424 | */ |
5af84b82 | 1425 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 1426 | { |
9cf519d1 RW |
1427 | pm_callback_t callback = NULL; |
1428 | char *info = NULL; | |
cd59abfc | 1429 | int error = 0; |
70fea60d | 1430 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
cd59abfc | 1431 | |
431d452a ZF |
1432 | TRACE_DEVICE(dev); |
1433 | TRACE_SUSPEND(0); | |
1434 | ||
8c73b428 | 1435 | dpm_wait_for_subordinate(dev, async); |
7a8d37a3 | 1436 | |
5af84b82 | 1437 | if (async_error) |
1f758b23 | 1438 | goto Complete; |
1e2ef05b | 1439 | |
88d26136 AS |
1440 | /* |
1441 | * If a device configured to wake up the system from sleep states | |
1442 | * has been suspended at run time and there's a resume request pending | |
1443 | * for it, this is equivalent to the device signaling wakeup, so the | |
1444 | * system suspend operation should be aborted. | |
1445 | */ | |
1e2ef05b RW |
1446 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1447 | pm_wakeup_event(dev, 0); | |
5af84b82 | 1448 | |
d83f905e RW |
1449 | if (pm_wakeup_pending()) { |
1450 | async_error = -EBUSY; | |
1f758b23 | 1451 | goto Complete; |
d83f905e RW |
1452 | } |
1453 | ||
dbf37414 RW |
1454 | if (dev->power.syscore) |
1455 | goto Complete; | |
1456 | ||
aae4518b RW |
1457 | if (dev->power.direct_complete) { |
1458 | if (pm_runtime_status_suspended(dev)) { | |
1459 | pm_runtime_disable(dev); | |
019d8817 | 1460 | if (pm_runtime_status_suspended(dev)) |
aae4518b RW |
1461 | goto Complete; |
1462 | ||
1463 | pm_runtime_enable(dev); | |
1464 | } | |
1465 | dev->power.direct_complete = false; | |
1466 | } | |
1467 | ||
70fea60d | 1468 | dpm_watchdog_set(&wd, dev); |
1e2ef05b RW |
1469 | device_lock(dev); |
1470 | ||
564b905a | 1471 | if (dev->pm_domain) { |
9cf519d1 RW |
1472 | info = "power domain "; |
1473 | callback = pm_op(&dev->pm_domain->ops, state); | |
1474 | goto Run; | |
4d27e9dc RW |
1475 | } |
1476 | ||
9659cc06 | 1477 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
1478 | info = "type "; |
1479 | callback = pm_op(dev->type->pm, state); | |
1480 | goto Run; | |
9659cc06 RW |
1481 | } |
1482 | ||
1eede070 RW |
1483 | if (dev->class) { |
1484 | if (dev->class->pm) { | |
9cf519d1 RW |
1485 | info = "class "; |
1486 | callback = pm_op(dev->class->pm, state); | |
1487 | goto Run; | |
1eede070 RW |
1488 | } else if (dev->class->suspend) { |
1489 | pm_dev_dbg(dev, state, "legacy class "); | |
53644677 SK |
1490 | error = legacy_suspend(dev, state, dev->class->suspend, |
1491 | "legacy class "); | |
4d27e9dc | 1492 | goto End; |
1eede070 | 1493 | } |
cd59abfc AS |
1494 | } |
1495 | ||
1eede070 RW |
1496 | if (dev->bus) { |
1497 | if (dev->bus->pm) { | |
35cd133c | 1498 | info = "bus "; |
9cf519d1 | 1499 | callback = pm_op(dev->bus->pm, state); |
1eede070 | 1500 | } else if (dev->bus->suspend) { |
35cd133c | 1501 | pm_dev_dbg(dev, state, "legacy bus "); |
53644677 SK |
1502 | error = legacy_suspend(dev, state, dev->bus->suspend, |
1503 | "legacy bus "); | |
9cf519d1 | 1504 | goto End; |
1eede070 | 1505 | } |
7538e3db RW |
1506 | } |
1507 | ||
9cf519d1 | 1508 | Run: |
35cd133c RW |
1509 | if (!callback && dev->driver && dev->driver->pm) { |
1510 | info = "driver "; | |
1511 | callback = pm_op(dev->driver->pm, state); | |
1512 | } | |
1513 | ||
9cf519d1 RW |
1514 | error = dpm_run_callback(callback, dev, state, info); |
1515 | ||
1eede070 | 1516 | End: |
4ca46ff3 | 1517 | if (!error) { |
aae4518b RW |
1518 | struct device *parent = dev->parent; |
1519 | ||
4ca46ff3 | 1520 | dev->power.is_suspended = true; |
aae4518b RW |
1521 | if (parent) { |
1522 | spin_lock_irq(&parent->power.lock); | |
1523 | ||
1524 | dev->parent->power.direct_complete = false; | |
1525 | if (dev->power.wakeup_path | |
1526 | && !dev->parent->power.ignore_children) | |
1527 | dev->parent->power.wakeup_path = true; | |
1528 | ||
1529 | spin_unlock_irq(&parent->power.lock); | |
1530 | } | |
8c73b428 | 1531 | dpm_clear_suppliers_direct_complete(dev); |
4ca46ff3 | 1532 | } |
6d0e0e84 | 1533 | |
8e9394ce | 1534 | device_unlock(dev); |
70fea60d | 1535 | dpm_watchdog_clear(&wd); |
1f758b23 MSB |
1536 | |
1537 | Complete: | |
88d26136 | 1538 | if (error) |
098dff73 RW |
1539 | async_error = error; |
1540 | ||
05a92622 | 1541 | complete_all(&dev->power.completion); |
431d452a | 1542 | TRACE_SUSPEND(error); |
cd59abfc AS |
1543 | return error; |
1544 | } | |
1545 | ||
5af84b82 RW |
1546 | static void async_suspend(void *data, async_cookie_t cookie) |
1547 | { | |
1548 | struct device *dev = (struct device *)data; | |
1549 | int error; | |
1550 | ||
1551 | error = __device_suspend(dev, pm_transition, true); | |
2a77c46d SL |
1552 | if (error) { |
1553 | dpm_save_failed_dev(dev_name(dev)); | |
5af84b82 | 1554 | pm_dev_err(dev, pm_transition, " async", error); |
2a77c46d | 1555 | } |
5af84b82 RW |
1556 | |
1557 | put_device(dev); | |
1558 | } | |
1559 | ||
1560 | static int device_suspend(struct device *dev) | |
1561 | { | |
16735d02 | 1562 | reinit_completion(&dev->power.completion); |
5af84b82 | 1563 | |
431d452a | 1564 | if (is_async(dev)) { |
5af84b82 RW |
1565 | get_device(dev); |
1566 | async_schedule(async_suspend, dev); | |
1567 | return 0; | |
1568 | } | |
1569 | ||
1570 | return __device_suspend(dev, pm_transition, false); | |
1571 | } | |
1572 | ||
cd59abfc | 1573 | /** |
20d652d7 RW |
1574 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
1575 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1576 | */ |
91e7c75b | 1577 | int dpm_suspend(pm_message_t state) |
cd59abfc | 1578 | { |
ecf762b2 | 1579 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
1580 | int error = 0; |
1581 | ||
bb3632c6 | 1582 | trace_suspend_resume(TPS("dpm_suspend"), state.event, true); |
91e7c75b RW |
1583 | might_sleep(); |
1584 | ||
2f0aea93 VK |
1585 | cpufreq_suspend(); |
1586 | ||
cd59abfc | 1587 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
1588 | pm_transition = state; |
1589 | async_error = 0; | |
8a43a9ab RW |
1590 | while (!list_empty(&dpm_prepared_list)) { |
1591 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 1592 | |
1eede070 | 1593 | get_device(dev); |
cd59abfc | 1594 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 1595 | |
5af84b82 | 1596 | error = device_suspend(dev); |
1eede070 | 1597 | |
1b3cbec1 | 1598 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 1599 | if (error) { |
1eede070 | 1600 | pm_dev_err(dev, state, "", error); |
2a77c46d | 1601 | dpm_save_failed_dev(dev_name(dev)); |
1eede070 | 1602 | put_device(dev); |
775b64d2 RW |
1603 | break; |
1604 | } | |
7a8d37a3 | 1605 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1606 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 1607 | put_device(dev); |
5af84b82 RW |
1608 | if (async_error) |
1609 | break; | |
cd59abfc AS |
1610 | } |
1611 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
1612 | async_synchronize_full(); |
1613 | if (!error) | |
1614 | error = async_error; | |
2a77c46d SL |
1615 | if (error) { |
1616 | suspend_stats.failed_suspend++; | |
1617 | dpm_save_failed_step(SUSPEND_SUSPEND); | |
1618 | } else | |
ecf762b2 | 1619 | dpm_show_time(starttime, state, NULL); |
bb3632c6 | 1620 | trace_suspend_resume(TPS("dpm_suspend"), state.event, false); |
1eede070 RW |
1621 | return error; |
1622 | } | |
1623 | ||
1624 | /** | |
20d652d7 RW |
1625 | * device_prepare - Prepare a device for system power transition. |
1626 | * @dev: Device to handle. | |
1627 | * @state: PM transition of the system being carried out. | |
1628 | * | |
1629 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
1630 | * device may be registered after this function has returned. | |
1eede070 | 1631 | */ |
d1616302 | 1632 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 | 1633 | { |
35cd133c | 1634 | int (*callback)(struct device *) = NULL; |
aae4518b | 1635 | int ret = 0; |
1eede070 | 1636 | |
dbf37414 RW |
1637 | if (dev->power.syscore) |
1638 | return 0; | |
1639 | ||
88d26136 AS |
1640 | /* |
1641 | * If a device's parent goes into runtime suspend at the wrong time, | |
1642 | * it won't be possible to resume the device. To prevent this we | |
1643 | * block runtime suspend here, during the prepare phase, and allow | |
1644 | * it again during the complete phase. | |
1645 | */ | |
1646 | pm_runtime_get_noresume(dev); | |
1647 | ||
8e9394ce | 1648 | device_lock(dev); |
1eede070 | 1649 | |
4ca46ff3 RW |
1650 | dev->power.wakeup_path = device_may_wakeup(dev); |
1651 | ||
aa8e54b5 TV |
1652 | if (dev->power.no_pm_callbacks) { |
1653 | ret = 1; /* Let device go direct_complete */ | |
1654 | goto unlock; | |
1655 | } | |
1656 | ||
fba1fbf5 | 1657 | if (dev->pm_domain) |
35cd133c | 1658 | callback = dev->pm_domain->ops.prepare; |
fba1fbf5 | 1659 | else if (dev->type && dev->type->pm) |
35cd133c | 1660 | callback = dev->type->pm->prepare; |
fba1fbf5 | 1661 | else if (dev->class && dev->class->pm) |
35cd133c | 1662 | callback = dev->class->pm->prepare; |
fba1fbf5 | 1663 | else if (dev->bus && dev->bus->pm) |
35cd133c | 1664 | callback = dev->bus->pm->prepare; |
35cd133c | 1665 | |
fba1fbf5 | 1666 | if (!callback && dev->driver && dev->driver->pm) |
35cd133c | 1667 | callback = dev->driver->pm->prepare; |
35cd133c | 1668 | |
32e8d689 | 1669 | if (callback) |
aae4518b | 1670 | ret = callback(dev); |
7538e3db | 1671 | |
aa8e54b5 | 1672 | unlock: |
8e9394ce | 1673 | device_unlock(dev); |
1eede070 | 1674 | |
aae4518b RW |
1675 | if (ret < 0) { |
1676 | suspend_report_result(callback, ret); | |
aa1b9f13 | 1677 | pm_runtime_put(dev); |
aae4518b RW |
1678 | return ret; |
1679 | } | |
1680 | /* | |
1681 | * A positive return value from ->prepare() means "this device appears | |
1682 | * to be runtime-suspended and its state is fine, so if it really is | |
1683 | * runtime-suspended, you can leave it in that state provided that you | |
1684 | * will do the same thing with all of its descendants". This only | |
1685 | * applies to suspend transitions, however. | |
1686 | */ | |
1687 | spin_lock_irq(&dev->power.lock); | |
1688 | dev->power.direct_complete = ret > 0 && state.event == PM_EVENT_SUSPEND; | |
1689 | spin_unlock_irq(&dev->power.lock); | |
1690 | return 0; | |
1eede070 | 1691 | } |
cd59abfc | 1692 | |
1eede070 | 1693 | /** |
20d652d7 RW |
1694 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1695 | * @state: PM transition of the system being carried out. | |
1eede070 | 1696 | * |
20d652d7 | 1697 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 | 1698 | */ |
91e7c75b | 1699 | int dpm_prepare(pm_message_t state) |
1eede070 | 1700 | { |
1eede070 RW |
1701 | int error = 0; |
1702 | ||
bb3632c6 | 1703 | trace_suspend_resume(TPS("dpm_prepare"), state.event, true); |
91e7c75b RW |
1704 | might_sleep(); |
1705 | ||
013c074f SG |
1706 | /* |
1707 | * Give a chance for the known devices to complete their probes, before | |
1708 | * disable probing of devices. This sync point is important at least | |
1709 | * at boot time + hibernation restore. | |
1710 | */ | |
1711 | wait_for_device_probe(); | |
1712 | /* | |
1713 | * It is unsafe if probing of devices will happen during suspend or | |
1714 | * hibernation and system behavior will be unpredictable in this case. | |
1715 | * So, let's prohibit device's probing here and defer their probes | |
1716 | * instead. The normal behavior will be restored in dpm_complete(). | |
1717 | */ | |
1718 | device_block_probing(); | |
1719 | ||
1eede070 | 1720 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
1721 | while (!list_empty(&dpm_list)) { |
1722 | struct device *dev = to_device(dpm_list.next); | |
1723 | ||
1724 | get_device(dev); | |
1eede070 RW |
1725 | mutex_unlock(&dpm_list_mtx); |
1726 | ||
32e8d689 | 1727 | trace_device_pm_callback_start(dev, "", state.event); |
1e2ef05b | 1728 | error = device_prepare(dev, state); |
32e8d689 | 1729 | trace_device_pm_callback_end(dev, error); |
1eede070 RW |
1730 | |
1731 | mutex_lock(&dpm_list_mtx); | |
1732 | if (error) { | |
1eede070 RW |
1733 | if (error == -EAGAIN) { |
1734 | put_device(dev); | |
886a7a33 | 1735 | error = 0; |
1eede070 RW |
1736 | continue; |
1737 | } | |
1e75227e RW |
1738 | printk(KERN_INFO "PM: Device %s not prepared " |
1739 | "for power transition: code %d\n", | |
5c1a07ab | 1740 | dev_name(dev), error); |
1eede070 RW |
1741 | put_device(dev); |
1742 | break; | |
1743 | } | |
f76b168b | 1744 | dev->power.is_prepared = true; |
1eede070 | 1745 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1746 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1747 | put_device(dev); |
1748 | } | |
1eede070 | 1749 | mutex_unlock(&dpm_list_mtx); |
bb3632c6 | 1750 | trace_suspend_resume(TPS("dpm_prepare"), state.event, false); |
cd59abfc AS |
1751 | return error; |
1752 | } | |
1753 | ||
775b64d2 | 1754 | /** |
20d652d7 RW |
1755 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1756 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1757 | * |
20d652d7 RW |
1758 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1759 | * callbacks for them. | |
775b64d2 | 1760 | */ |
d1616302 | 1761 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1762 | { |
1763 | int error; | |
cd59abfc | 1764 | |
1eede070 | 1765 | error = dpm_prepare(state); |
2a77c46d SL |
1766 | if (error) { |
1767 | suspend_stats.failed_prepare++; | |
1768 | dpm_save_failed_step(SUSPEND_PREPARE); | |
1769 | } else | |
1eede070 | 1770 | error = dpm_suspend(state); |
cd59abfc | 1771 | return error; |
cd59abfc | 1772 | } |
d1616302 | 1773 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1774 | |
1775 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1776 | { | |
c80cfb04 BH |
1777 | if (ret) |
1778 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1779 | } |
1780 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1781 | |
1782 | /** | |
1783 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1784 | * @dev: Device to wait for. | |
1785 | * @subordinate: Device that needs to wait for @dev. | |
1786 | */ | |
098dff73 | 1787 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1788 | { |
1789 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1790 | return async_error; |
f8824cee RW |
1791 | } |
1792 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); | |
dfe3212e ML |
1793 | |
1794 | /** | |
1795 | * dpm_for_each_dev - device iterator. | |
1796 | * @data: data for the callback. | |
1797 | * @fn: function to be called for each device. | |
1798 | * | |
1799 | * Iterate over devices in dpm_list, and call @fn for each device, | |
1800 | * passing it @data. | |
1801 | */ | |
1802 | void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) | |
1803 | { | |
1804 | struct device *dev; | |
1805 | ||
1806 | if (!fn) | |
1807 | return; | |
1808 | ||
1809 | device_pm_lock(); | |
1810 | list_for_each_entry(dev, &dpm_list, power.entry) | |
1811 | fn(dev, data); | |
1812 | device_pm_unlock(); | |
1813 | } | |
1814 | EXPORT_SYMBOL_GPL(dpm_for_each_dev); | |
aa8e54b5 TV |
1815 | |
1816 | static bool pm_ops_is_empty(const struct dev_pm_ops *ops) | |
1817 | { | |
1818 | if (!ops) | |
1819 | return true; | |
1820 | ||
1821 | return !ops->prepare && | |
1822 | !ops->suspend && | |
1823 | !ops->suspend_late && | |
1824 | !ops->suspend_noirq && | |
1825 | !ops->resume_noirq && | |
1826 | !ops->resume_early && | |
1827 | !ops->resume && | |
1828 | !ops->complete; | |
1829 | } | |
1830 | ||
1831 | void device_pm_check_callbacks(struct device *dev) | |
1832 | { | |
1833 | spin_lock_irq(&dev->power.lock); | |
1834 | dev->power.no_pm_callbacks = | |
1835 | (!dev->bus || pm_ops_is_empty(dev->bus->pm)) && | |
1836 | (!dev->class || pm_ops_is_empty(dev->class->pm)) && | |
1837 | (!dev->type || pm_ops_is_empty(dev->type->pm)) && | |
1838 | (!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) && | |
1839 | (!dev->driver || pm_ops_is_empty(dev->driver->pm)); | |
1840 | spin_unlock_irq(&dev->power.lock); | |
1841 | } |