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> |
1b6bc32f | 21 | #include <linux/export.h> |
11048dcf | 22 | #include <linux/mutex.h> |
cd59abfc | 23 | #include <linux/pm.h> |
5e928f77 | 24 | #include <linux/pm_runtime.h> |
431d452a | 25 | #include <linux/pm-trace.h> |
4990d4fe | 26 | #include <linux/pm_wakeirq.h> |
2ed8d2b3 | 27 | #include <linux/interrupt.h> |
f2511774 | 28 | #include <linux/sched.h> |
b17b0153 | 29 | #include <linux/sched/debug.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 | ||
952856db | 64 | static const char *pm_verb(int event) |
53644677 SK |
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, | |
e3771fa9 KK |
210 | int error, pm_message_t state, |
211 | const char *info) | |
875ab0b7 | 212 | { |
53644677 SK |
213 | ktime_t rettime; |
214 | s64 nsecs; | |
215 | ||
216 | rettime = ktime_get(); | |
217 | nsecs = (s64) ktime_to_ns(ktime_sub(rettime, calltime)); | |
875ab0b7 | 218 | |
b2df1d4f | 219 | if (pm_print_times_enabled) { |
875ab0b7 | 220 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), |
53644677 | 221 | error, (unsigned long long)nsecs >> 10); |
875ab0b7 RW |
222 | } |
223 | } | |
224 | ||
5af84b82 RW |
225 | /** |
226 | * dpm_wait - Wait for a PM operation to complete. | |
227 | * @dev: Device to wait for. | |
228 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
229 | */ | |
230 | static void dpm_wait(struct device *dev, bool async) | |
231 | { | |
232 | if (!dev) | |
233 | return; | |
234 | ||
0e06b4a8 | 235 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
236 | wait_for_completion(&dev->power.completion); |
237 | } | |
238 | ||
239 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
240 | { | |
241 | dpm_wait(dev, *((bool *)async_ptr)); | |
242 | return 0; | |
243 | } | |
244 | ||
245 | static void dpm_wait_for_children(struct device *dev, bool async) | |
246 | { | |
247 | device_for_each_child(dev, &async, dpm_wait_fn); | |
248 | } | |
249 | ||
8c73b428 RW |
250 | static void dpm_wait_for_suppliers(struct device *dev, bool async) |
251 | { | |
252 | struct device_link *link; | |
253 | int idx; | |
254 | ||
255 | idx = device_links_read_lock(); | |
256 | ||
257 | /* | |
258 | * If the supplier goes away right after we've checked the link to it, | |
259 | * we'll wait for its completion to change the state, but that's fine, | |
260 | * because the only things that will block as a result are the SRCU | |
261 | * callbacks freeing the link objects for the links in the list we're | |
262 | * walking. | |
263 | */ | |
264 | list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) | |
265 | if (READ_ONCE(link->status) != DL_STATE_DORMANT) | |
266 | dpm_wait(link->supplier, async); | |
267 | ||
268 | device_links_read_unlock(idx); | |
269 | } | |
270 | ||
271 | static void dpm_wait_for_superior(struct device *dev, bool async) | |
272 | { | |
273 | dpm_wait(dev->parent, async); | |
274 | dpm_wait_for_suppliers(dev, async); | |
275 | } | |
276 | ||
277 | static void dpm_wait_for_consumers(struct device *dev, bool async) | |
278 | { | |
279 | struct device_link *link; | |
280 | int idx; | |
281 | ||
282 | idx = device_links_read_lock(); | |
283 | ||
284 | /* | |
285 | * The status of a device link can only be changed from "dormant" by a | |
286 | * probe, but that cannot happen during system suspend/resume. In | |
287 | * theory it can change to "dormant" at that time, but then it is | |
288 | * reasonable to wait for the target device anyway (eg. if it goes | |
289 | * away, it's better to wait for it to go away completely and then | |
290 | * continue instead of trying to continue in parallel with its | |
291 | * unregistration). | |
292 | */ | |
293 | list_for_each_entry_rcu(link, &dev->links.consumers, s_node) | |
294 | if (READ_ONCE(link->status) != DL_STATE_DORMANT) | |
295 | dpm_wait(link->consumer, async); | |
296 | ||
297 | device_links_read_unlock(idx); | |
298 | } | |
299 | ||
300 | static void dpm_wait_for_subordinate(struct device *dev, bool async) | |
301 | { | |
302 | dpm_wait_for_children(dev, async); | |
303 | dpm_wait_for_consumers(dev, async); | |
304 | } | |
305 | ||
1eede070 | 306 | /** |
9cf519d1 | 307 | * pm_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
308 | * @ops: PM operations to choose from. |
309 | * @state: PM transition of the system being carried out. | |
1eede070 | 310 | */ |
9cf519d1 | 311 | static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 312 | { |
1eede070 RW |
313 | switch (state.event) { |
314 | #ifdef CONFIG_SUSPEND | |
315 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 316 | return ops->suspend; |
1eede070 | 317 | case PM_EVENT_RESUME: |
9cf519d1 | 318 | return ops->resume; |
1eede070 | 319 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 320 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
321 | case PM_EVENT_FREEZE: |
322 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 323 | return ops->freeze; |
1eede070 | 324 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 325 | return ops->poweroff; |
1eede070 RW |
326 | case PM_EVENT_THAW: |
327 | case PM_EVENT_RECOVER: | |
9cf519d1 | 328 | return ops->thaw; |
1eede070 RW |
329 | break; |
330 | case PM_EVENT_RESTORE: | |
9cf519d1 | 331 | return ops->restore; |
1f112cee | 332 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 333 | } |
f2511774 | 334 | |
9cf519d1 | 335 | return NULL; |
1eede070 RW |
336 | } |
337 | ||
cf579dfb RW |
338 | /** |
339 | * pm_late_early_op - Return the PM operation appropriate for given PM event. | |
340 | * @ops: PM operations to choose from. | |
341 | * @state: PM transition of the system being carried out. | |
342 | * | |
343 | * Runtime PM is disabled for @dev while this function is being executed. | |
344 | */ | |
345 | static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops, | |
346 | pm_message_t state) | |
347 | { | |
348 | switch (state.event) { | |
349 | #ifdef CONFIG_SUSPEND | |
350 | case PM_EVENT_SUSPEND: | |
351 | return ops->suspend_late; | |
352 | case PM_EVENT_RESUME: | |
353 | return ops->resume_early; | |
354 | #endif /* CONFIG_SUSPEND */ | |
355 | #ifdef CONFIG_HIBERNATE_CALLBACKS | |
356 | case PM_EVENT_FREEZE: | |
357 | case PM_EVENT_QUIESCE: | |
358 | return ops->freeze_late; | |
359 | case PM_EVENT_HIBERNATE: | |
360 | return ops->poweroff_late; | |
361 | case PM_EVENT_THAW: | |
362 | case PM_EVENT_RECOVER: | |
363 | return ops->thaw_early; | |
364 | case PM_EVENT_RESTORE: | |
365 | return ops->restore_early; | |
366 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ | |
367 | } | |
368 | ||
369 | return NULL; | |
370 | } | |
371 | ||
1eede070 | 372 | /** |
9cf519d1 | 373 | * pm_noirq_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
374 | * @ops: PM operations to choose from. |
375 | * @state: PM transition of the system being carried out. | |
1eede070 | 376 | * |
20d652d7 RW |
377 | * The driver of @dev will not receive interrupts while this function is being |
378 | * executed. | |
1eede070 | 379 | */ |
9cf519d1 | 380 | static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 381 | { |
1eede070 RW |
382 | switch (state.event) { |
383 | #ifdef CONFIG_SUSPEND | |
384 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 385 | return ops->suspend_noirq; |
1eede070 | 386 | case PM_EVENT_RESUME: |
9cf519d1 | 387 | return ops->resume_noirq; |
1eede070 | 388 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 389 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
390 | case PM_EVENT_FREEZE: |
391 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 392 | return ops->freeze_noirq; |
1eede070 | 393 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 394 | return ops->poweroff_noirq; |
1eede070 RW |
395 | case PM_EVENT_THAW: |
396 | case PM_EVENT_RECOVER: | |
9cf519d1 | 397 | return ops->thaw_noirq; |
1eede070 | 398 | case PM_EVENT_RESTORE: |
9cf519d1 | 399 | return ops->restore_noirq; |
1f112cee | 400 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 401 | } |
f2511774 | 402 | |
9cf519d1 | 403 | return NULL; |
1eede070 RW |
404 | } |
405 | ||
e3771fa9 | 406 | static void pm_dev_dbg(struct device *dev, pm_message_t state, const char *info) |
1eede070 RW |
407 | { |
408 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
409 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
410 | ", may wakeup" : ""); | |
411 | } | |
412 | ||
e3771fa9 | 413 | static void pm_dev_err(struct device *dev, pm_message_t state, const char *info, |
1eede070 RW |
414 | int error) |
415 | { | |
416 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
5c1a07ab | 417 | dev_name(dev), pm_verb(state.event), info, error); |
1eede070 RW |
418 | } |
419 | ||
48059c09 | 420 | static void dpm_show_time(ktime_t starttime, pm_message_t state, int error, |
e3771fa9 | 421 | const char *info) |
ecf762b2 RW |
422 | { |
423 | ktime_t calltime; | |
0702d9ee | 424 | u64 usecs64; |
ecf762b2 RW |
425 | int usecs; |
426 | ||
427 | calltime = ktime_get(); | |
428 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
429 | do_div(usecs64, NSEC_PER_USEC); | |
430 | usecs = usecs64; | |
431 | if (usecs == 0) | |
432 | usecs = 1; | |
8d8b2441 | 433 | |
48059c09 | 434 | pm_pr_dbg("%s%s%s of devices %s after %ld.%03ld msecs\n", |
8d8b2441 | 435 | info ?: "", info ? " " : "", pm_verb(state.event), |
48059c09 | 436 | error ? "aborted" : "complete", |
8d8b2441 | 437 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); |
ecf762b2 RW |
438 | } |
439 | ||
9cf519d1 | 440 | static int dpm_run_callback(pm_callback_t cb, struct device *dev, |
e3771fa9 | 441 | pm_message_t state, const char *info) |
9cf519d1 RW |
442 | { |
443 | ktime_t calltime; | |
444 | int error; | |
445 | ||
446 | if (!cb) | |
447 | return 0; | |
448 | ||
449 | calltime = initcall_debug_start(dev); | |
450 | ||
451 | pm_dev_dbg(dev, state, info); | |
e8bca479 | 452 | trace_device_pm_callback_start(dev, info, state.event); |
9cf519d1 | 453 | error = cb(dev); |
e8bca479 | 454 | trace_device_pm_callback_end(dev, error); |
9cf519d1 RW |
455 | suspend_report_result(cb, error); |
456 | ||
53644677 | 457 | initcall_debug_report(dev, calltime, error, state, info); |
9cf519d1 RW |
458 | |
459 | return error; | |
460 | } | |
461 | ||
70fea60d BG |
462 | #ifdef CONFIG_DPM_WATCHDOG |
463 | struct dpm_watchdog { | |
464 | struct device *dev; | |
465 | struct task_struct *tsk; | |
466 | struct timer_list timer; | |
467 | }; | |
468 | ||
469 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \ | |
470 | struct dpm_watchdog wd | |
471 | ||
472 | /** | |
473 | * dpm_watchdog_handler - Driver suspend / resume watchdog handler. | |
474 | * @data: Watchdog object address. | |
475 | * | |
476 | * Called when a driver has timed out suspending or resuming. | |
477 | * There's not much we can do here to recover so panic() to | |
478 | * capture a crash-dump in pstore. | |
479 | */ | |
9c6c273a | 480 | static void dpm_watchdog_handler(struct timer_list *t) |
70fea60d | 481 | { |
9c6c273a | 482 | struct dpm_watchdog *wd = from_timer(wd, t, timer); |
70fea60d BG |
483 | |
484 | dev_emerg(wd->dev, "**** DPM device timeout ****\n"); | |
485 | show_stack(wd->tsk, NULL); | |
486 | panic("%s %s: unrecoverable failure\n", | |
487 | dev_driver_string(wd->dev), dev_name(wd->dev)); | |
488 | } | |
489 | ||
490 | /** | |
491 | * dpm_watchdog_set - Enable pm watchdog for given device. | |
492 | * @wd: Watchdog. Must be allocated on the stack. | |
493 | * @dev: Device to handle. | |
494 | */ | |
495 | static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev) | |
496 | { | |
497 | struct timer_list *timer = &wd->timer; | |
498 | ||
499 | wd->dev = dev; | |
500 | wd->tsk = current; | |
501 | ||
9c6c273a | 502 | timer_setup_on_stack(timer, dpm_watchdog_handler, 0); |
70fea60d BG |
503 | /* use same timeout value for both suspend and resume */ |
504 | timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT; | |
70fea60d BG |
505 | add_timer(timer); |
506 | } | |
507 | ||
508 | /** | |
509 | * dpm_watchdog_clear - Disable suspend/resume watchdog. | |
510 | * @wd: Watchdog to disable. | |
511 | */ | |
512 | static void dpm_watchdog_clear(struct dpm_watchdog *wd) | |
513 | { | |
514 | struct timer_list *timer = &wd->timer; | |
515 | ||
516 | del_timer_sync(timer); | |
517 | destroy_timer_on_stack(timer); | |
518 | } | |
519 | #else | |
520 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) | |
521 | #define dpm_watchdog_set(x, y) | |
522 | #define dpm_watchdog_clear(x) | |
523 | #endif | |
524 | ||
cd59abfc AS |
525 | /*------------------------- Resume routines -------------------------*/ |
526 | ||
3487972d RW |
527 | /** |
528 | * dev_pm_skip_next_resume_phases - Skip next system resume phases for device. | |
529 | * @dev: Target device. | |
530 | * | |
531 | * Make the core skip the "early resume" and "resume" phases for @dev. | |
532 | * | |
533 | * This function can be called by middle-layer code during the "noirq" phase of | |
534 | * system resume if necessary, but not by device drivers. | |
535 | */ | |
536 | void dev_pm_skip_next_resume_phases(struct device *dev) | |
537 | { | |
538 | dev->power.is_late_suspended = false; | |
539 | dev->power.is_suspended = false; | |
540 | } | |
541 | ||
75e94645 RW |
542 | /** |
543 | * suspend_event - Return a "suspend" message for given "resume" one. | |
544 | * @resume_msg: PM message representing a system-wide resume transition. | |
545 | */ | |
546 | static pm_message_t suspend_event(pm_message_t resume_msg) | |
547 | { | |
548 | switch (resume_msg.event) { | |
549 | case PM_EVENT_RESUME: | |
550 | return PMSG_SUSPEND; | |
551 | case PM_EVENT_THAW: | |
552 | case PM_EVENT_RESTORE: | |
553 | return PMSG_FREEZE; | |
554 | case PM_EVENT_RECOVER: | |
555 | return PMSG_HIBERNATE; | |
556 | } | |
557 | return PMSG_ON; | |
558 | } | |
559 | ||
0d4b54c6 RW |
560 | /** |
561 | * dev_pm_may_skip_resume - System-wide device resume optimization check. | |
562 | * @dev: Target device. | |
563 | * | |
564 | * Checks whether or not the device may be left in suspend after a system-wide | |
565 | * transition to the working state. | |
566 | */ | |
567 | bool dev_pm_may_skip_resume(struct device *dev) | |
568 | { | |
569 | return !dev->power.must_resume && pm_transition.event != PM_EVENT_RESTORE; | |
570 | } | |
571 | ||
4fa3061a RW |
572 | static pm_callback_t dpm_subsys_resume_noirq_cb(struct device *dev, |
573 | pm_message_t state, | |
574 | const char **info_p) | |
575 | { | |
576 | pm_callback_t callback; | |
577 | const char *info; | |
578 | ||
579 | if (dev->pm_domain) { | |
580 | info = "noirq power domain "; | |
581 | callback = pm_noirq_op(&dev->pm_domain->ops, state); | |
582 | } else if (dev->type && dev->type->pm) { | |
583 | info = "noirq type "; | |
584 | callback = pm_noirq_op(dev->type->pm, state); | |
585 | } else if (dev->class && dev->class->pm) { | |
586 | info = "noirq class "; | |
587 | callback = pm_noirq_op(dev->class->pm, state); | |
588 | } else if (dev->bus && dev->bus->pm) { | |
589 | info = "noirq bus "; | |
590 | callback = pm_noirq_op(dev->bus->pm, state); | |
591 | } else { | |
592 | return NULL; | |
593 | } | |
594 | ||
595 | if (info_p) | |
596 | *info_p = info; | |
597 | ||
598 | return callback; | |
599 | } | |
600 | ||
75e94645 RW |
601 | static pm_callback_t dpm_subsys_suspend_noirq_cb(struct device *dev, |
602 | pm_message_t state, | |
603 | const char **info_p); | |
604 | ||
605 | static pm_callback_t dpm_subsys_suspend_late_cb(struct device *dev, | |
606 | pm_message_t state, | |
607 | const char **info_p); | |
608 | ||
cd59abfc | 609 | /** |
b082ddd8 | 610 | * device_resume_noirq - Execute a "noirq resume" callback for given device. |
20d652d7 RW |
611 | * @dev: Device to handle. |
612 | * @state: PM transition of the system being carried out. | |
58c256a3 | 613 | * @async: If true, the device is being resumed asynchronously. |
cd59abfc | 614 | * |
20d652d7 RW |
615 | * The driver of @dev will not receive interrupts while this function is being |
616 | * executed. | |
cd59abfc | 617 | */ |
76569faa | 618 | static int device_resume_noirq(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 619 | { |
4fa3061a RW |
620 | pm_callback_t callback; |
621 | const char *info; | |
32bfa56a | 622 | bool skip_resume; |
cd59abfc AS |
623 | int error = 0; |
624 | ||
625 | TRACE_DEVICE(dev); | |
626 | TRACE_RESUME(0); | |
627 | ||
aae4518b | 628 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
629 | goto Out; |
630 | ||
3d2699bc LC |
631 | if (!dev->power.is_noirq_suspended) |
632 | goto Out; | |
633 | ||
8c73b428 | 634 | dpm_wait_for_superior(dev, async); |
76569faa | 635 | |
32bfa56a RW |
636 | skip_resume = dev_pm_may_skip_resume(dev); |
637 | ||
4fa3061a | 638 | callback = dpm_subsys_resume_noirq_cb(dev, state, &info); |
75e94645 RW |
639 | if (callback) |
640 | goto Run; | |
e7176a37 | 641 | |
32bfa56a RW |
642 | if (skip_resume) |
643 | goto Skip; | |
644 | ||
75e94645 RW |
645 | if (dev_pm_smart_suspend_and_suspended(dev)) { |
646 | pm_message_t suspend_msg = suspend_event(state); | |
647 | ||
648 | /* | |
649 | * If "freeze" callbacks have been skipped during a transition | |
650 | * related to hibernation, the subsequent "thaw" callbacks must | |
651 | * be skipped too or bad things may happen. Otherwise, resume | |
652 | * callbacks are going to be run for the device, so its runtime | |
653 | * PM status must be changed to reflect the new state after the | |
654 | * transition under way. | |
655 | */ | |
656 | if (!dpm_subsys_suspend_late_cb(dev, suspend_msg, NULL) && | |
657 | !dpm_subsys_suspend_noirq_cb(dev, suspend_msg, NULL)) { | |
658 | if (state.event == PM_EVENT_THAW) { | |
32bfa56a | 659 | skip_resume = true; |
75e94645 RW |
660 | goto Skip; |
661 | } else { | |
662 | pm_runtime_set_active(dev); | |
663 | } | |
664 | } | |
665 | } | |
666 | ||
667 | if (dev->driver && dev->driver->pm) { | |
cf579dfb | 668 | info = "noirq driver "; |
35cd133c RW |
669 | callback = pm_noirq_op(dev->driver->pm, state); |
670 | } | |
671 | ||
75e94645 | 672 | Run: |
9cf519d1 | 673 | error = dpm_run_callback(callback, dev, state, info); |
75e94645 RW |
674 | |
675 | Skip: | |
3d2699bc | 676 | dev->power.is_noirq_suspended = false; |
9cf519d1 | 677 | |
32bfa56a | 678 | if (skip_resume) { |
0d4b54c6 RW |
679 | /* |
680 | * The device is going to be left in suspend, but it might not | |
681 | * have been in runtime suspend before the system suspended, so | |
682 | * its runtime PM status needs to be updated to avoid confusing | |
683 | * the runtime PM framework when runtime PM is enabled for the | |
684 | * device again. | |
685 | */ | |
686 | pm_runtime_set_suspended(dev); | |
34fb8f0b | 687 | dev_pm_skip_next_resume_phases(dev); |
0d4b54c6 RW |
688 | } |
689 | ||
75e94645 | 690 | Out: |
76569faa | 691 | complete_all(&dev->power.completion); |
775b64d2 RW |
692 | TRACE_RESUME(error); |
693 | return error; | |
694 | } | |
695 | ||
76569faa LC |
696 | static bool is_async(struct device *dev) |
697 | { | |
698 | return dev->power.async_suspend && pm_async_enabled | |
699 | && !pm_trace_is_enabled(); | |
700 | } | |
701 | ||
702 | static void async_resume_noirq(void *data, async_cookie_t cookie) | |
703 | { | |
704 | struct device *dev = (struct device *)data; | |
705 | int error; | |
706 | ||
707 | error = device_resume_noirq(dev, pm_transition, true); | |
708 | if (error) | |
709 | pm_dev_err(dev, pm_transition, " async", error); | |
710 | ||
711 | put_device(dev); | |
712 | } | |
713 | ||
786f41fb | 714 | void dpm_noirq_resume_devices(pm_message_t state) |
775b64d2 | 715 | { |
76569faa | 716 | struct device *dev; |
ecf762b2 | 717 | ktime_t starttime = ktime_get(); |
775b64d2 | 718 | |
bb3632c6 | 719 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, true); |
32bdfac5 | 720 | mutex_lock(&dpm_list_mtx); |
76569faa | 721 | pm_transition = state; |
d08a5ace | 722 | |
76569faa LC |
723 | /* |
724 | * Advanced the async threads upfront, | |
725 | * in case the starting of async threads is | |
726 | * delayed by non-async resuming devices. | |
727 | */ | |
728 | list_for_each_entry(dev, &dpm_noirq_list, power.entry) { | |
729 | reinit_completion(&dev->power.completion); | |
730 | if (is_async(dev)) { | |
731 | get_device(dev); | |
732 | async_schedule(async_resume_noirq, dev); | |
733 | } | |
734 | } | |
735 | ||
736 | while (!list_empty(&dpm_noirq_list)) { | |
737 | dev = to_device(dpm_noirq_list.next); | |
d08a5ace | 738 | get_device(dev); |
cf579dfb | 739 | list_move_tail(&dev->power.entry, &dpm_late_early_list); |
5b219a51 | 740 | mutex_unlock(&dpm_list_mtx); |
d08a5ace | 741 | |
76569faa LC |
742 | if (!is_async(dev)) { |
743 | int error; | |
744 | ||
745 | error = device_resume_noirq(dev, state, false); | |
746 | if (error) { | |
747 | suspend_stats.failed_resume_noirq++; | |
748 | dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); | |
749 | dpm_save_failed_dev(dev_name(dev)); | |
750 | pm_dev_err(dev, state, " noirq", error); | |
751 | } | |
cf579dfb RW |
752 | } |
753 | ||
754 | mutex_lock(&dpm_list_mtx); | |
755 | put_device(dev); | |
756 | } | |
757 | mutex_unlock(&dpm_list_mtx); | |
76569faa | 758 | async_synchronize_full(); |
48059c09 | 759 | dpm_show_time(starttime, state, 0, "noirq"); |
786f41fb RW |
760 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false); |
761 | } | |
762 | ||
763 | void dpm_noirq_end(void) | |
764 | { | |
cf579dfb | 765 | resume_device_irqs(); |
4990d4fe | 766 | device_wakeup_disarm_wake_irqs(); |
8651f97b | 767 | cpuidle_resume(); |
786f41fb RW |
768 | } |
769 | ||
770 | /** | |
771 | * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices. | |
772 | * @state: PM transition of the system being carried out. | |
773 | * | |
774 | * Invoke the "noirq" resume callbacks for all devices in dpm_noirq_list and | |
775 | * allow device drivers' interrupt handlers to be called. | |
776 | */ | |
777 | void dpm_resume_noirq(pm_message_t state) | |
778 | { | |
779 | dpm_noirq_resume_devices(state); | |
780 | dpm_noirq_end(); | |
cf579dfb RW |
781 | } |
782 | ||
4fa3061a RW |
783 | static pm_callback_t dpm_subsys_resume_early_cb(struct device *dev, |
784 | pm_message_t state, | |
785 | const char **info_p) | |
786 | { | |
787 | pm_callback_t callback; | |
788 | const char *info; | |
789 | ||
790 | if (dev->pm_domain) { | |
791 | info = "early power domain "; | |
792 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
793 | } else if (dev->type && dev->type->pm) { | |
794 | info = "early type "; | |
795 | callback = pm_late_early_op(dev->type->pm, state); | |
796 | } else if (dev->class && dev->class->pm) { | |
797 | info = "early class "; | |
798 | callback = pm_late_early_op(dev->class->pm, state); | |
799 | } else if (dev->bus && dev->bus->pm) { | |
800 | info = "early bus "; | |
801 | callback = pm_late_early_op(dev->bus->pm, state); | |
802 | } else { | |
803 | return NULL; | |
804 | } | |
805 | ||
806 | if (info_p) | |
807 | *info_p = info; | |
808 | ||
809 | return callback; | |
810 | } | |
811 | ||
cf579dfb RW |
812 | /** |
813 | * device_resume_early - Execute an "early resume" callback for given device. | |
814 | * @dev: Device to handle. | |
815 | * @state: PM transition of the system being carried out. | |
58c256a3 | 816 | * @async: If true, the device is being resumed asynchronously. |
cf579dfb RW |
817 | * |
818 | * Runtime PM is disabled for @dev while this function is being executed. | |
819 | */ | |
9e5e7910 | 820 | static int device_resume_early(struct device *dev, pm_message_t state, bool async) |
cf579dfb | 821 | { |
4fa3061a RW |
822 | pm_callback_t callback; |
823 | const char *info; | |
cf579dfb RW |
824 | int error = 0; |
825 | ||
826 | TRACE_DEVICE(dev); | |
827 | TRACE_RESUME(0); | |
828 | ||
aae4518b | 829 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
830 | goto Out; |
831 | ||
3d2699bc LC |
832 | if (!dev->power.is_late_suspended) |
833 | goto Out; | |
834 | ||
8c73b428 | 835 | dpm_wait_for_superior(dev, async); |
9e5e7910 | 836 | |
4fa3061a | 837 | callback = dpm_subsys_resume_early_cb(dev, state, &info); |
cf579dfb RW |
838 | |
839 | if (!callback && dev->driver && dev->driver->pm) { | |
840 | info = "early driver "; | |
841 | callback = pm_late_early_op(dev->driver->pm, state); | |
842 | } | |
843 | ||
844 | error = dpm_run_callback(callback, dev, state, info); | |
3d2699bc | 845 | dev->power.is_late_suspended = false; |
cf579dfb | 846 | |
dbf37414 | 847 | Out: |
cf579dfb | 848 | TRACE_RESUME(error); |
9f6d8f6a RW |
849 | |
850 | pm_runtime_enable(dev); | |
9e5e7910 | 851 | complete_all(&dev->power.completion); |
cf579dfb RW |
852 | return error; |
853 | } | |
854 | ||
9e5e7910 LC |
855 | static void async_resume_early(void *data, async_cookie_t cookie) |
856 | { | |
857 | struct device *dev = (struct device *)data; | |
858 | int error; | |
859 | ||
860 | error = device_resume_early(dev, pm_transition, true); | |
861 | if (error) | |
862 | pm_dev_err(dev, pm_transition, " async", error); | |
863 | ||
864 | put_device(dev); | |
865 | } | |
866 | ||
cf579dfb RW |
867 | /** |
868 | * dpm_resume_early - Execute "early resume" callbacks for all devices. | |
869 | * @state: PM transition of the system being carried out. | |
870 | */ | |
2a8a8ce6 | 871 | void dpm_resume_early(pm_message_t state) |
cf579dfb | 872 | { |
9e5e7910 | 873 | struct device *dev; |
cf579dfb RW |
874 | ktime_t starttime = ktime_get(); |
875 | ||
bb3632c6 | 876 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, true); |
cf579dfb | 877 | mutex_lock(&dpm_list_mtx); |
9e5e7910 LC |
878 | pm_transition = state; |
879 | ||
880 | /* | |
881 | * Advanced the async threads upfront, | |
882 | * in case the starting of async threads is | |
883 | * delayed by non-async resuming devices. | |
884 | */ | |
885 | list_for_each_entry(dev, &dpm_late_early_list, power.entry) { | |
886 | reinit_completion(&dev->power.completion); | |
887 | if (is_async(dev)) { | |
888 | get_device(dev); | |
889 | async_schedule(async_resume_early, dev); | |
890 | } | |
891 | } | |
cf579dfb | 892 | |
9e5e7910 LC |
893 | while (!list_empty(&dpm_late_early_list)) { |
894 | dev = to_device(dpm_late_early_list.next); | |
cf579dfb RW |
895 | get_device(dev); |
896 | list_move_tail(&dev->power.entry, &dpm_suspended_list); | |
897 | mutex_unlock(&dpm_list_mtx); | |
898 | ||
9e5e7910 LC |
899 | if (!is_async(dev)) { |
900 | int error; | |
d08a5ace | 901 | |
9e5e7910 LC |
902 | error = device_resume_early(dev, state, false); |
903 | if (error) { | |
904 | suspend_stats.failed_resume_early++; | |
905 | dpm_save_failed_step(SUSPEND_RESUME_EARLY); | |
906 | dpm_save_failed_dev(dev_name(dev)); | |
907 | pm_dev_err(dev, state, " early", error); | |
908 | } | |
909 | } | |
5b219a51 | 910 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
911 | put_device(dev); |
912 | } | |
32bdfac5 | 913 | mutex_unlock(&dpm_list_mtx); |
9e5e7910 | 914 | async_synchronize_full(); |
48059c09 | 915 | dpm_show_time(starttime, state, 0, "early"); |
bb3632c6 | 916 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, false); |
775b64d2 | 917 | } |
cf579dfb RW |
918 | |
919 | /** | |
920 | * dpm_resume_start - Execute "noirq" and "early" device callbacks. | |
921 | * @state: PM transition of the system being carried out. | |
922 | */ | |
923 | void dpm_resume_start(pm_message_t state) | |
924 | { | |
925 | dpm_resume_noirq(state); | |
926 | dpm_resume_early(state); | |
927 | } | |
928 | EXPORT_SYMBOL_GPL(dpm_resume_start); | |
775b64d2 RW |
929 | |
930 | /** | |
97df8c12 | 931 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
932 | * @dev: Device to handle. |
933 | * @state: PM transition of the system being carried out. | |
5af84b82 | 934 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 935 | */ |
97df8c12 | 936 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 937 | { |
9cf519d1 | 938 | pm_callback_t callback = NULL; |
e3771fa9 | 939 | const char *info = NULL; |
775b64d2 | 940 | int error = 0; |
70fea60d | 941 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
775b64d2 RW |
942 | |
943 | TRACE_DEVICE(dev); | |
944 | TRACE_RESUME(0); | |
cd59abfc | 945 | |
dbf37414 RW |
946 | if (dev->power.syscore) |
947 | goto Complete; | |
948 | ||
aae4518b RW |
949 | if (dev->power.direct_complete) { |
950 | /* Match the pm_runtime_disable() in __device_suspend(). */ | |
951 | pm_runtime_enable(dev); | |
952 | goto Complete; | |
953 | } | |
954 | ||
8c73b428 | 955 | dpm_wait_for_superior(dev, async); |
70fea60d | 956 | dpm_watchdog_set(&wd, dev); |
8e9394ce | 957 | device_lock(dev); |
7a8d37a3 | 958 | |
f76b168b AS |
959 | /* |
960 | * This is a fib. But we'll allow new children to be added below | |
961 | * a resumed device, even if the device hasn't been completed yet. | |
962 | */ | |
963 | dev->power.is_prepared = false; | |
97df8c12 | 964 | |
6d0e0e84 AS |
965 | if (!dev->power.is_suspended) |
966 | goto Unlock; | |
967 | ||
564b905a | 968 | if (dev->pm_domain) { |
9cf519d1 RW |
969 | info = "power domain "; |
970 | callback = pm_op(&dev->pm_domain->ops, state); | |
35cd133c | 971 | goto Driver; |
7538e3db RW |
972 | } |
973 | ||
9659cc06 | 974 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
975 | info = "type "; |
976 | callback = pm_op(dev->type->pm, state); | |
35cd133c | 977 | goto Driver; |
cd59abfc AS |
978 | } |
979 | ||
a380f2ed RW |
980 | if (dev->class && dev->class->pm) { |
981 | info = "class "; | |
982 | callback = pm_op(dev->class->pm, state); | |
983 | goto Driver; | |
cd59abfc | 984 | } |
9659cc06 RW |
985 | |
986 | if (dev->bus) { | |
987 | if (dev->bus->pm) { | |
35cd133c | 988 | info = "bus "; |
9cf519d1 | 989 | callback = pm_op(dev->bus->pm, state); |
9659cc06 | 990 | } else if (dev->bus->resume) { |
35cd133c | 991 | info = "legacy bus "; |
9cf519d1 | 992 | callback = dev->bus->resume; |
35cd133c | 993 | goto End; |
9659cc06 RW |
994 | } |
995 | } | |
996 | ||
35cd133c RW |
997 | Driver: |
998 | if (!callback && dev->driver && dev->driver->pm) { | |
999 | info = "driver "; | |
1000 | callback = pm_op(dev->driver->pm, state); | |
1001 | } | |
1002 | ||
1eede070 | 1003 | End: |
9cf519d1 | 1004 | error = dpm_run_callback(callback, dev, state, info); |
6d0e0e84 AS |
1005 | dev->power.is_suspended = false; |
1006 | ||
1007 | Unlock: | |
8e9394ce | 1008 | device_unlock(dev); |
70fea60d | 1009 | dpm_watchdog_clear(&wd); |
dbf37414 RW |
1010 | |
1011 | Complete: | |
5af84b82 | 1012 | complete_all(&dev->power.completion); |
7a8d37a3 | 1013 | |
cd59abfc | 1014 | TRACE_RESUME(error); |
1e2ef05b | 1015 | |
cd59abfc AS |
1016 | return error; |
1017 | } | |
1018 | ||
5af84b82 RW |
1019 | static void async_resume(void *data, async_cookie_t cookie) |
1020 | { | |
1021 | struct device *dev = (struct device *)data; | |
1022 | int error; | |
1023 | ||
97df8c12 | 1024 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
1025 | if (error) |
1026 | pm_dev_err(dev, pm_transition, " async", error); | |
1027 | put_device(dev); | |
1028 | } | |
1029 | ||
775b64d2 | 1030 | /** |
20d652d7 RW |
1031 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
1032 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1033 | * |
20d652d7 RW |
1034 | * Execute the appropriate "resume" callback for all devices whose status |
1035 | * indicates that they are suspended. | |
1eede070 | 1036 | */ |
91e7c75b | 1037 | void dpm_resume(pm_message_t state) |
1eede070 | 1038 | { |
97df8c12 | 1039 | struct device *dev; |
ecf762b2 | 1040 | ktime_t starttime = ktime_get(); |
1eede070 | 1041 | |
bb3632c6 | 1042 | trace_suspend_resume(TPS("dpm_resume"), state.event, true); |
91e7c75b RW |
1043 | might_sleep(); |
1044 | ||
1eede070 | 1045 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 1046 | pm_transition = state; |
098dff73 | 1047 | async_error = 0; |
1eede070 | 1048 | |
8a43a9ab | 1049 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
16735d02 | 1050 | reinit_completion(&dev->power.completion); |
97df8c12 RW |
1051 | if (is_async(dev)) { |
1052 | get_device(dev); | |
1053 | async_schedule(async_resume, dev); | |
1054 | } | |
1055 | } | |
1056 | ||
8a43a9ab RW |
1057 | while (!list_empty(&dpm_suspended_list)) { |
1058 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 1059 | get_device(dev); |
5b219a51 | 1060 | if (!is_async(dev)) { |
1eede070 RW |
1061 | int error; |
1062 | ||
1eede070 RW |
1063 | mutex_unlock(&dpm_list_mtx); |
1064 | ||
97df8c12 | 1065 | error = device_resume(dev, state, false); |
2a77c46d SL |
1066 | if (error) { |
1067 | suspend_stats.failed_resume++; | |
1068 | dpm_save_failed_step(SUSPEND_RESUME); | |
1069 | dpm_save_failed_dev(dev_name(dev)); | |
1eede070 | 1070 | pm_dev_err(dev, state, "", error); |
2a77c46d | 1071 | } |
5b219a51 RW |
1072 | |
1073 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
1074 | } |
1075 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 1076 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1077 | put_device(dev); |
1078 | } | |
1eede070 | 1079 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 1080 | async_synchronize_full(); |
48059c09 | 1081 | dpm_show_time(starttime, state, 0, NULL); |
2f0aea93 VK |
1082 | |
1083 | cpufreq_resume(); | |
bb3632c6 | 1084 | trace_suspend_resume(TPS("dpm_resume"), state.event, false); |
1eede070 RW |
1085 | } |
1086 | ||
1087 | /** | |
20d652d7 RW |
1088 | * device_complete - Complete a PM transition for given device. |
1089 | * @dev: Device to handle. | |
1090 | * @state: PM transition of the system being carried out. | |
1eede070 | 1091 | */ |
d1616302 | 1092 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 1093 | { |
35cd133c | 1094 | void (*callback)(struct device *) = NULL; |
e3771fa9 | 1095 | const char *info = NULL; |
35cd133c | 1096 | |
dbf37414 RW |
1097 | if (dev->power.syscore) |
1098 | return; | |
1099 | ||
8e9394ce | 1100 | device_lock(dev); |
1eede070 | 1101 | |
564b905a | 1102 | if (dev->pm_domain) { |
35cd133c RW |
1103 | info = "completing power domain "; |
1104 | callback = dev->pm_domain->ops.complete; | |
4d27e9dc | 1105 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
1106 | info = "completing type "; |
1107 | callback = dev->type->pm->complete; | |
9659cc06 | 1108 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
1109 | info = "completing class "; |
1110 | callback = dev->class->pm->complete; | |
9659cc06 | 1111 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
1112 | info = "completing bus "; |
1113 | callback = dev->bus->pm->complete; | |
1114 | } | |
1115 | ||
1116 | if (!callback && dev->driver && dev->driver->pm) { | |
1117 | info = "completing driver "; | |
1118 | callback = dev->driver->pm->complete; | |
1119 | } | |
1120 | ||
1121 | if (callback) { | |
1122 | pm_dev_dbg(dev, state, info); | |
1123 | callback(dev); | |
1eede070 RW |
1124 | } |
1125 | ||
8e9394ce | 1126 | device_unlock(dev); |
88d26136 | 1127 | |
af939339 | 1128 | pm_runtime_put(dev); |
1eede070 RW |
1129 | } |
1130 | ||
1131 | /** | |
20d652d7 RW |
1132 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
1133 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1134 | * |
20d652d7 RW |
1135 | * Execute the ->complete() callbacks for all devices whose PM status is not |
1136 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 1137 | */ |
91e7c75b | 1138 | void dpm_complete(pm_message_t state) |
cd59abfc | 1139 | { |
1eede070 RW |
1140 | struct list_head list; |
1141 | ||
bb3632c6 | 1142 | trace_suspend_resume(TPS("dpm_complete"), state.event, true); |
91e7c75b RW |
1143 | might_sleep(); |
1144 | ||
1eede070 | 1145 | INIT_LIST_HEAD(&list); |
cd59abfc | 1146 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
1147 | while (!list_empty(&dpm_prepared_list)) { |
1148 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 1149 | |
1eede070 | 1150 | get_device(dev); |
f76b168b | 1151 | dev->power.is_prepared = false; |
5b219a51 RW |
1152 | list_move(&dev->power.entry, &list); |
1153 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 1154 | |
32e8d689 | 1155 | trace_device_pm_callback_start(dev, "", state.event); |
5b219a51 | 1156 | device_complete(dev, state); |
32e8d689 | 1157 | trace_device_pm_callback_end(dev, 0); |
1eede070 | 1158 | |
5b219a51 | 1159 | mutex_lock(&dpm_list_mtx); |
1eede070 | 1160 | put_device(dev); |
cd59abfc | 1161 | } |
1eede070 | 1162 | list_splice(&list, &dpm_list); |
cd59abfc | 1163 | mutex_unlock(&dpm_list_mtx); |
013c074f SG |
1164 | |
1165 | /* Allow device probing and trigger re-probing of deferred devices */ | |
1166 | device_unblock_probing(); | |
bb3632c6 | 1167 | trace_suspend_resume(TPS("dpm_complete"), state.event, false); |
cd59abfc AS |
1168 | } |
1169 | ||
cd59abfc | 1170 | /** |
20d652d7 RW |
1171 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
1172 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1173 | * |
20d652d7 RW |
1174 | * Execute "resume" callbacks for all devices and complete the PM transition of |
1175 | * the system. | |
cd59abfc | 1176 | */ |
d1616302 | 1177 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 1178 | { |
1eede070 RW |
1179 | dpm_resume(state); |
1180 | dpm_complete(state); | |
cd59abfc | 1181 | } |
d1616302 | 1182 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
1183 | |
1184 | ||
1185 | /*------------------------- Suspend routines -------------------------*/ | |
1186 | ||
1eede070 | 1187 | /** |
20d652d7 RW |
1188 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
1189 | * @sleep_state: PM message representing a sleep state. | |
1190 | * | |
1191 | * Return a PM message representing the resume event corresponding to given | |
1192 | * sleep state. | |
1eede070 RW |
1193 | */ |
1194 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 1195 | { |
1eede070 RW |
1196 | switch (sleep_state.event) { |
1197 | case PM_EVENT_SUSPEND: | |
1198 | return PMSG_RESUME; | |
1199 | case PM_EVENT_FREEZE: | |
1200 | case PM_EVENT_QUIESCE: | |
1201 | return PMSG_RECOVER; | |
1202 | case PM_EVENT_HIBERNATE: | |
1203 | return PMSG_RESTORE; | |
cd59abfc | 1204 | } |
1eede070 | 1205 | return PMSG_ON; |
cd59abfc AS |
1206 | } |
1207 | ||
0d4b54c6 RW |
1208 | static void dpm_superior_set_must_resume(struct device *dev) |
1209 | { | |
1210 | struct device_link *link; | |
1211 | int idx; | |
1212 | ||
1213 | if (dev->parent) | |
1214 | dev->parent->power.must_resume = true; | |
1215 | ||
1216 | idx = device_links_read_lock(); | |
1217 | ||
1218 | list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) | |
1219 | link->supplier->power.must_resume = true; | |
1220 | ||
1221 | device_links_read_unlock(idx); | |
1222 | } | |
1223 | ||
4fa3061a RW |
1224 | static pm_callback_t dpm_subsys_suspend_noirq_cb(struct device *dev, |
1225 | pm_message_t state, | |
1226 | const char **info_p) | |
1227 | { | |
1228 | pm_callback_t callback; | |
1229 | const char *info; | |
1230 | ||
1231 | if (dev->pm_domain) { | |
1232 | info = "noirq power domain "; | |
1233 | callback = pm_noirq_op(&dev->pm_domain->ops, state); | |
1234 | } else if (dev->type && dev->type->pm) { | |
1235 | info = "noirq type "; | |
1236 | callback = pm_noirq_op(dev->type->pm, state); | |
1237 | } else if (dev->class && dev->class->pm) { | |
1238 | info = "noirq class "; | |
1239 | callback = pm_noirq_op(dev->class->pm, state); | |
1240 | } else if (dev->bus && dev->bus->pm) { | |
1241 | info = "noirq bus "; | |
1242 | callback = pm_noirq_op(dev->bus->pm, state); | |
1243 | } else { | |
1244 | return NULL; | |
1245 | } | |
1246 | ||
1247 | if (info_p) | |
1248 | *info_p = info; | |
1249 | ||
1250 | return callback; | |
1251 | } | |
1252 | ||
32bfa56a RW |
1253 | static bool device_must_resume(struct device *dev, pm_message_t state, |
1254 | bool no_subsys_suspend_noirq) | |
1255 | { | |
1256 | pm_message_t resume_msg = resume_event(state); | |
1257 | ||
1258 | /* | |
1259 | * If all of the device driver's "noirq", "late" and "early" callbacks | |
1260 | * are invoked directly by the core, the decision to allow the device to | |
1261 | * stay in suspend can be based on its current runtime PM status and its | |
1262 | * wakeup settings. | |
1263 | */ | |
1264 | if (no_subsys_suspend_noirq && | |
1265 | !dpm_subsys_suspend_late_cb(dev, state, NULL) && | |
1266 | !dpm_subsys_resume_early_cb(dev, resume_msg, NULL) && | |
1267 | !dpm_subsys_resume_noirq_cb(dev, resume_msg, NULL)) | |
1268 | return !pm_runtime_status_suspended(dev) && | |
1269 | (resume_msg.event != PM_EVENT_RESUME || | |
1270 | (device_can_wakeup(dev) && !device_may_wakeup(dev))); | |
1271 | ||
1272 | /* | |
1273 | * The only safe strategy here is to require that if the device may not | |
1274 | * be left in suspend, resume callbacks must be invoked for it. | |
1275 | */ | |
1276 | return !dev->power.may_skip_resume; | |
1277 | } | |
1278 | ||
cd59abfc | 1279 | /** |
b082ddd8 | 1280 | * __device_suspend_noirq - Execute a "noirq suspend" callback for given device. |
20d652d7 RW |
1281 | * @dev: Device to handle. |
1282 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1283 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1284 | * |
20d652d7 RW |
1285 | * The driver of @dev will not receive interrupts while this function is being |
1286 | * executed. | |
cd59abfc | 1287 | */ |
28b6fd6e | 1288 | static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 1289 | { |
4fa3061a RW |
1290 | pm_callback_t callback; |
1291 | const char *info; | |
32bfa56a | 1292 | bool no_subsys_cb = false; |
28b6fd6e LC |
1293 | int error = 0; |
1294 | ||
431d452a ZF |
1295 | TRACE_DEVICE(dev); |
1296 | TRACE_SUSPEND(0); | |
1297 | ||
098c3055 | 1298 | dpm_wait_for_subordinate(dev, async); |
6f75c3fd | 1299 | |
28b6fd6e LC |
1300 | if (async_error) |
1301 | goto Complete; | |
1302 | ||
9a3ebe35 RW |
1303 | if (pm_wakeup_pending()) { |
1304 | async_error = -EBUSY; | |
1305 | goto Complete; | |
1306 | } | |
1307 | ||
aae4518b | 1308 | if (dev->power.syscore || dev->power.direct_complete) |
28b6fd6e LC |
1309 | goto Complete; |
1310 | ||
4fa3061a | 1311 | callback = dpm_subsys_suspend_noirq_cb(dev, state, &info); |
75e94645 RW |
1312 | if (callback) |
1313 | goto Run; | |
7538e3db | 1314 | |
32bfa56a RW |
1315 | no_subsys_cb = !dpm_subsys_suspend_late_cb(dev, state, NULL); |
1316 | ||
1317 | if (dev_pm_smart_suspend_and_suspended(dev) && no_subsys_cb) | |
75e94645 RW |
1318 | goto Skip; |
1319 | ||
1320 | if (dev->driver && dev->driver->pm) { | |
cf579dfb | 1321 | info = "noirq driver "; |
35cd133c RW |
1322 | callback = pm_noirq_op(dev->driver->pm, state); |
1323 | } | |
1324 | ||
75e94645 | 1325 | Run: |
3d2699bc | 1326 | error = dpm_run_callback(callback, dev, state, info); |
0d4b54c6 | 1327 | if (error) { |
28b6fd6e | 1328 | async_error = error; |
0d4b54c6 RW |
1329 | goto Complete; |
1330 | } | |
1331 | ||
75e94645 | 1332 | Skip: |
0d4b54c6 RW |
1333 | dev->power.is_noirq_suspended = true; |
1334 | ||
1335 | if (dev_pm_test_driver_flags(dev, DPM_FLAG_LEAVE_SUSPENDED)) { | |
0d4b54c6 | 1336 | dev->power.must_resume = dev->power.must_resume || |
32bfa56a RW |
1337 | atomic_read(&dev->power.usage_count) > 1 || |
1338 | device_must_resume(dev, state, no_subsys_cb); | |
0d4b54c6 RW |
1339 | } else { |
1340 | dev->power.must_resume = true; | |
1341 | } | |
1342 | ||
1343 | if (dev->power.must_resume) | |
1344 | dpm_superior_set_must_resume(dev); | |
3d2699bc | 1345 | |
28b6fd6e LC |
1346 | Complete: |
1347 | complete_all(&dev->power.completion); | |
431d452a | 1348 | TRACE_SUSPEND(error); |
3d2699bc | 1349 | return error; |
775b64d2 RW |
1350 | } |
1351 | ||
28b6fd6e LC |
1352 | static void async_suspend_noirq(void *data, async_cookie_t cookie) |
1353 | { | |
1354 | struct device *dev = (struct device *)data; | |
1355 | int error; | |
1356 | ||
1357 | error = __device_suspend_noirq(dev, pm_transition, true); | |
1358 | if (error) { | |
1359 | dpm_save_failed_dev(dev_name(dev)); | |
1360 | pm_dev_err(dev, pm_transition, " async", error); | |
1361 | } | |
1362 | ||
1363 | put_device(dev); | |
1364 | } | |
1365 | ||
1366 | static int device_suspend_noirq(struct device *dev) | |
1367 | { | |
1368 | reinit_completion(&dev->power.completion); | |
1369 | ||
431d452a | 1370 | if (is_async(dev)) { |
28b6fd6e LC |
1371 | get_device(dev); |
1372 | async_schedule(async_suspend_noirq, dev); | |
1373 | return 0; | |
1374 | } | |
1375 | return __device_suspend_noirq(dev, pm_transition, false); | |
1376 | } | |
1377 | ||
786f41fb RW |
1378 | void dpm_noirq_begin(void) |
1379 | { | |
1380 | cpuidle_pause(); | |
1381 | device_wakeup_arm_wake_irqs(); | |
1382 | suspend_device_irqs(); | |
1383 | } | |
1384 | ||
1385 | int dpm_noirq_suspend_devices(pm_message_t state) | |
775b64d2 | 1386 | { |
ecf762b2 | 1387 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
1388 | int error = 0; |
1389 | ||
bb3632c6 | 1390 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true); |
32bdfac5 | 1391 | mutex_lock(&dpm_list_mtx); |
28b6fd6e LC |
1392 | pm_transition = state; |
1393 | async_error = 0; | |
1394 | ||
cf579dfb RW |
1395 | while (!list_empty(&dpm_late_early_list)) { |
1396 | struct device *dev = to_device(dpm_late_early_list.prev); | |
d08a5ace RW |
1397 | |
1398 | get_device(dev); | |
1399 | mutex_unlock(&dpm_list_mtx); | |
1400 | ||
28b6fd6e | 1401 | error = device_suspend_noirq(dev); |
d08a5ace RW |
1402 | |
1403 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 1404 | if (error) { |
cf579dfb | 1405 | pm_dev_err(dev, state, " noirq", error); |
2a77c46d | 1406 | dpm_save_failed_dev(dev_name(dev)); |
d08a5ace | 1407 | put_device(dev); |
775b64d2 RW |
1408 | break; |
1409 | } | |
d08a5ace | 1410 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1411 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 1412 | put_device(dev); |
52d136cc | 1413 | |
28b6fd6e | 1414 | if (async_error) |
52d136cc | 1415 | break; |
775b64d2 | 1416 | } |
32bdfac5 | 1417 | mutex_unlock(&dpm_list_mtx); |
28b6fd6e LC |
1418 | async_synchronize_full(); |
1419 | if (!error) | |
1420 | error = async_error; | |
1421 | ||
1422 | if (error) { | |
1423 | suspend_stats.failed_suspend_noirq++; | |
1424 | dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); | |
28b6fd6e | 1425 | } |
48059c09 | 1426 | dpm_show_time(starttime, state, error, "noirq"); |
bb3632c6 | 1427 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false); |
cf579dfb RW |
1428 | return error; |
1429 | } | |
1430 | ||
786f41fb RW |
1431 | /** |
1432 | * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices. | |
1433 | * @state: PM transition of the system being carried out. | |
1434 | * | |
1435 | * Prevent device drivers' interrupt handlers from being called and invoke | |
1436 | * "noirq" suspend callbacks for all non-sysdev devices. | |
1437 | */ | |
1438 | int dpm_suspend_noirq(pm_message_t state) | |
1439 | { | |
1440 | int ret; | |
1441 | ||
1442 | dpm_noirq_begin(); | |
1443 | ret = dpm_noirq_suspend_devices(state); | |
1444 | if (ret) | |
1445 | dpm_resume_noirq(resume_event(state)); | |
1446 | ||
1447 | return ret; | |
1448 | } | |
1449 | ||
4fa3061a RW |
1450 | static pm_callback_t dpm_subsys_suspend_late_cb(struct device *dev, |
1451 | pm_message_t state, | |
1452 | const char **info_p) | |
1453 | { | |
1454 | pm_callback_t callback; | |
1455 | const char *info; | |
1456 | ||
1457 | if (dev->pm_domain) { | |
1458 | info = "late power domain "; | |
1459 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
1460 | } else if (dev->type && dev->type->pm) { | |
1461 | info = "late type "; | |
1462 | callback = pm_late_early_op(dev->type->pm, state); | |
1463 | } else if (dev->class && dev->class->pm) { | |
1464 | info = "late class "; | |
1465 | callback = pm_late_early_op(dev->class->pm, state); | |
1466 | } else if (dev->bus && dev->bus->pm) { | |
1467 | info = "late bus "; | |
1468 | callback = pm_late_early_op(dev->bus->pm, state); | |
1469 | } else { | |
1470 | return NULL; | |
1471 | } | |
1472 | ||
1473 | if (info_p) | |
1474 | *info_p = info; | |
1475 | ||
1476 | return callback; | |
1477 | } | |
1478 | ||
cf579dfb | 1479 | /** |
b082ddd8 | 1480 | * __device_suspend_late - Execute a "late suspend" callback for given device. |
cf579dfb RW |
1481 | * @dev: Device to handle. |
1482 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1483 | * @async: If true, the device is being suspended asynchronously. |
cf579dfb RW |
1484 | * |
1485 | * Runtime PM is disabled for @dev while this function is being executed. | |
1486 | */ | |
de377b39 | 1487 | static int __device_suspend_late(struct device *dev, pm_message_t state, bool async) |
cf579dfb | 1488 | { |
4fa3061a RW |
1489 | pm_callback_t callback; |
1490 | const char *info; | |
de377b39 | 1491 | int error = 0; |
cf579dfb | 1492 | |
431d452a ZF |
1493 | TRACE_DEVICE(dev); |
1494 | TRACE_SUSPEND(0); | |
1495 | ||
9f6d8f6a RW |
1496 | __pm_runtime_disable(dev, false); |
1497 | ||
098c3055 | 1498 | dpm_wait_for_subordinate(dev, async); |
6f75c3fd | 1499 | |
de377b39 LC |
1500 | if (async_error) |
1501 | goto Complete; | |
1502 | ||
1503 | if (pm_wakeup_pending()) { | |
1504 | async_error = -EBUSY; | |
1505 | goto Complete; | |
1506 | } | |
1507 | ||
aae4518b | 1508 | if (dev->power.syscore || dev->power.direct_complete) |
de377b39 LC |
1509 | goto Complete; |
1510 | ||
4fa3061a | 1511 | callback = dpm_subsys_suspend_late_cb(dev, state, &info); |
75e94645 RW |
1512 | if (callback) |
1513 | goto Run; | |
cf579dfb | 1514 | |
75e94645 RW |
1515 | if (dev_pm_smart_suspend_and_suspended(dev) && |
1516 | !dpm_subsys_suspend_noirq_cb(dev, state, NULL)) | |
1517 | goto Skip; | |
1518 | ||
1519 | if (dev->driver && dev->driver->pm) { | |
cf579dfb RW |
1520 | info = "late driver "; |
1521 | callback = pm_late_early_op(dev->driver->pm, state); | |
1522 | } | |
1523 | ||
75e94645 | 1524 | Run: |
3d2699bc | 1525 | error = dpm_run_callback(callback, dev, state, info); |
75e94645 | 1526 | if (error) { |
de377b39 | 1527 | async_error = error; |
75e94645 RW |
1528 | goto Complete; |
1529 | } | |
1530 | ||
1531 | Skip: | |
1532 | dev->power.is_late_suspended = true; | |
3d2699bc | 1533 | |
de377b39 | 1534 | Complete: |
431d452a | 1535 | TRACE_SUSPEND(error); |
de377b39 | 1536 | complete_all(&dev->power.completion); |
3d2699bc | 1537 | return error; |
cf579dfb RW |
1538 | } |
1539 | ||
de377b39 LC |
1540 | static void async_suspend_late(void *data, async_cookie_t cookie) |
1541 | { | |
1542 | struct device *dev = (struct device *)data; | |
1543 | int error; | |
1544 | ||
1545 | error = __device_suspend_late(dev, pm_transition, true); | |
1546 | if (error) { | |
1547 | dpm_save_failed_dev(dev_name(dev)); | |
1548 | pm_dev_err(dev, pm_transition, " async", error); | |
1549 | } | |
1550 | put_device(dev); | |
1551 | } | |
1552 | ||
1553 | static int device_suspend_late(struct device *dev) | |
1554 | { | |
1555 | reinit_completion(&dev->power.completion); | |
1556 | ||
431d452a | 1557 | if (is_async(dev)) { |
de377b39 LC |
1558 | get_device(dev); |
1559 | async_schedule(async_suspend_late, dev); | |
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | return __device_suspend_late(dev, pm_transition, false); | |
1564 | } | |
1565 | ||
cf579dfb RW |
1566 | /** |
1567 | * dpm_suspend_late - Execute "late suspend" callbacks for all devices. | |
1568 | * @state: PM transition of the system being carried out. | |
1569 | */ | |
2a8a8ce6 | 1570 | int dpm_suspend_late(pm_message_t state) |
cf579dfb RW |
1571 | { |
1572 | ktime_t starttime = ktime_get(); | |
1573 | int error = 0; | |
1574 | ||
bb3632c6 | 1575 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, true); |
cf579dfb | 1576 | mutex_lock(&dpm_list_mtx); |
de377b39 LC |
1577 | pm_transition = state; |
1578 | async_error = 0; | |
1579 | ||
cf579dfb RW |
1580 | while (!list_empty(&dpm_suspended_list)) { |
1581 | struct device *dev = to_device(dpm_suspended_list.prev); | |
1582 | ||
1583 | get_device(dev); | |
1584 | mutex_unlock(&dpm_list_mtx); | |
1585 | ||
de377b39 | 1586 | error = device_suspend_late(dev); |
cf579dfb RW |
1587 | |
1588 | mutex_lock(&dpm_list_mtx); | |
3a17fb32 RW |
1589 | if (!list_empty(&dev->power.entry)) |
1590 | list_move(&dev->power.entry, &dpm_late_early_list); | |
1591 | ||
cf579dfb RW |
1592 | if (error) { |
1593 | pm_dev_err(dev, state, " late", error); | |
cf579dfb RW |
1594 | dpm_save_failed_dev(dev_name(dev)); |
1595 | put_device(dev); | |
1596 | break; | |
1597 | } | |
cf579dfb | 1598 | put_device(dev); |
52d136cc | 1599 | |
de377b39 | 1600 | if (async_error) |
52d136cc | 1601 | break; |
cf579dfb RW |
1602 | } |
1603 | mutex_unlock(&dpm_list_mtx); | |
de377b39 | 1604 | async_synchronize_full(); |
246ef766 ID |
1605 | if (!error) |
1606 | error = async_error; | |
de377b39 LC |
1607 | if (error) { |
1608 | suspend_stats.failed_suspend_late++; | |
1609 | dpm_save_failed_step(SUSPEND_SUSPEND_LATE); | |
cf579dfb | 1610 | dpm_resume_early(resume_event(state)); |
de377b39 | 1611 | } |
48059c09 | 1612 | dpm_show_time(starttime, state, error, "late"); |
bb3632c6 | 1613 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false); |
775b64d2 RW |
1614 | return error; |
1615 | } | |
cf579dfb RW |
1616 | |
1617 | /** | |
1618 | * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks. | |
1619 | * @state: PM transition of the system being carried out. | |
1620 | */ | |
1621 | int dpm_suspend_end(pm_message_t state) | |
1622 | { | |
1623 | int error = dpm_suspend_late(state); | |
064b021f CC |
1624 | if (error) |
1625 | return error; | |
1626 | ||
1627 | error = dpm_suspend_noirq(state); | |
1628 | if (error) { | |
997a0311 | 1629 | dpm_resume_early(resume_event(state)); |
064b021f CC |
1630 | return error; |
1631 | } | |
cf579dfb | 1632 | |
064b021f | 1633 | return 0; |
cf579dfb RW |
1634 | } |
1635 | EXPORT_SYMBOL_GPL(dpm_suspend_end); | |
775b64d2 | 1636 | |
875ab0b7 RW |
1637 | /** |
1638 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
1639 | * @dev: Device to suspend. |
1640 | * @state: PM transition of the system being carried out. | |
1641 | * @cb: Suspend callback to execute. | |
58c256a3 | 1642 | * @info: string description of caller. |
875ab0b7 RW |
1643 | */ |
1644 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
53644677 | 1645 | int (*cb)(struct device *dev, pm_message_t state), |
e3771fa9 | 1646 | const char *info) |
875ab0b7 RW |
1647 | { |
1648 | int error; | |
1649 | ktime_t calltime; | |
1650 | ||
1651 | calltime = initcall_debug_start(dev); | |
1652 | ||
e8bca479 | 1653 | trace_device_pm_callback_start(dev, info, state.event); |
875ab0b7 | 1654 | error = cb(dev, state); |
e8bca479 | 1655 | trace_device_pm_callback_end(dev, error); |
875ab0b7 RW |
1656 | suspend_report_result(cb, error); |
1657 | ||
53644677 | 1658 | initcall_debug_report(dev, calltime, error, state, info); |
875ab0b7 RW |
1659 | |
1660 | return error; | |
1661 | } | |
1662 | ||
c23bd387 | 1663 | static void dpm_propagate_wakeup_to_parent(struct device *dev) |
1172ee31 UH |
1664 | { |
1665 | struct device *parent = dev->parent; | |
1666 | ||
1667 | if (!parent) | |
1668 | return; | |
1669 | ||
1670 | spin_lock_irq(&parent->power.lock); | |
1671 | ||
1172ee31 UH |
1672 | if (dev->power.wakeup_path && !parent->power.ignore_children) |
1673 | parent->power.wakeup_path = true; | |
1674 | ||
1675 | spin_unlock_irq(&parent->power.lock); | |
1676 | } | |
1677 | ||
c23bd387 | 1678 | static void dpm_clear_superiors_direct_complete(struct device *dev) |
8c73b428 RW |
1679 | { |
1680 | struct device_link *link; | |
1681 | int idx; | |
1682 | ||
c23bd387 UH |
1683 | if (dev->parent) { |
1684 | spin_lock_irq(&dev->parent->power.lock); | |
1685 | dev->parent->power.direct_complete = false; | |
1686 | spin_unlock_irq(&dev->parent->power.lock); | |
1687 | } | |
1688 | ||
8c73b428 RW |
1689 | idx = device_links_read_lock(); |
1690 | ||
1691 | list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) { | |
1692 | spin_lock_irq(&link->supplier->power.lock); | |
1693 | link->supplier->power.direct_complete = false; | |
1694 | spin_unlock_irq(&link->supplier->power.lock); | |
1695 | } | |
1696 | ||
1697 | device_links_read_unlock(idx); | |
1698 | } | |
1699 | ||
775b64d2 | 1700 | /** |
b082ddd8 | 1701 | * __device_suspend - Execute "suspend" callbacks for given device. |
20d652d7 RW |
1702 | * @dev: Device to handle. |
1703 | * @state: PM transition of the system being carried out. | |
5af84b82 | 1704 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1705 | */ |
5af84b82 | 1706 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 1707 | { |
9cf519d1 | 1708 | pm_callback_t callback = NULL; |
e3771fa9 | 1709 | const char *info = NULL; |
cd59abfc | 1710 | int error = 0; |
70fea60d | 1711 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
cd59abfc | 1712 | |
431d452a ZF |
1713 | TRACE_DEVICE(dev); |
1714 | TRACE_SUSPEND(0); | |
1715 | ||
8c73b428 | 1716 | dpm_wait_for_subordinate(dev, async); |
7a8d37a3 | 1717 | |
5af84b82 | 1718 | if (async_error) |
1f758b23 | 1719 | goto Complete; |
1e2ef05b | 1720 | |
88d26136 AS |
1721 | /* |
1722 | * If a device configured to wake up the system from sleep states | |
1723 | * has been suspended at run time and there's a resume request pending | |
1724 | * for it, this is equivalent to the device signaling wakeup, so the | |
1725 | * system suspend operation should be aborted. | |
1726 | */ | |
1e2ef05b RW |
1727 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1728 | pm_wakeup_event(dev, 0); | |
5af84b82 | 1729 | |
d83f905e RW |
1730 | if (pm_wakeup_pending()) { |
1731 | async_error = -EBUSY; | |
1f758b23 | 1732 | goto Complete; |
d83f905e RW |
1733 | } |
1734 | ||
dbf37414 RW |
1735 | if (dev->power.syscore) |
1736 | goto Complete; | |
1737 | ||
aae4518b RW |
1738 | if (dev->power.direct_complete) { |
1739 | if (pm_runtime_status_suspended(dev)) { | |
1740 | pm_runtime_disable(dev); | |
019d8817 | 1741 | if (pm_runtime_status_suspended(dev)) |
aae4518b RW |
1742 | goto Complete; |
1743 | ||
1744 | pm_runtime_enable(dev); | |
1745 | } | |
1746 | dev->power.direct_complete = false; | |
1747 | } | |
1748 | ||
0d4b54c6 RW |
1749 | dev->power.may_skip_resume = false; |
1750 | dev->power.must_resume = false; | |
1751 | ||
70fea60d | 1752 | dpm_watchdog_set(&wd, dev); |
1e2ef05b RW |
1753 | device_lock(dev); |
1754 | ||
564b905a | 1755 | if (dev->pm_domain) { |
9cf519d1 RW |
1756 | info = "power domain "; |
1757 | callback = pm_op(&dev->pm_domain->ops, state); | |
1758 | goto Run; | |
4d27e9dc RW |
1759 | } |
1760 | ||
9659cc06 | 1761 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
1762 | info = "type "; |
1763 | callback = pm_op(dev->type->pm, state); | |
1764 | goto Run; | |
9659cc06 RW |
1765 | } |
1766 | ||
a380f2ed RW |
1767 | if (dev->class && dev->class->pm) { |
1768 | info = "class "; | |
1769 | callback = pm_op(dev->class->pm, state); | |
1770 | goto Run; | |
cd59abfc AS |
1771 | } |
1772 | ||
1eede070 RW |
1773 | if (dev->bus) { |
1774 | if (dev->bus->pm) { | |
35cd133c | 1775 | info = "bus "; |
9cf519d1 | 1776 | callback = pm_op(dev->bus->pm, state); |
1eede070 | 1777 | } else if (dev->bus->suspend) { |
35cd133c | 1778 | pm_dev_dbg(dev, state, "legacy bus "); |
53644677 SK |
1779 | error = legacy_suspend(dev, state, dev->bus->suspend, |
1780 | "legacy bus "); | |
9cf519d1 | 1781 | goto End; |
1eede070 | 1782 | } |
7538e3db RW |
1783 | } |
1784 | ||
9cf519d1 | 1785 | Run: |
35cd133c RW |
1786 | if (!callback && dev->driver && dev->driver->pm) { |
1787 | info = "driver "; | |
1788 | callback = pm_op(dev->driver->pm, state); | |
1789 | } | |
1790 | ||
9cf519d1 RW |
1791 | error = dpm_run_callback(callback, dev, state, info); |
1792 | ||
1eede070 | 1793 | End: |
4ca46ff3 RW |
1794 | if (!error) { |
1795 | dev->power.is_suspended = true; | |
8512220c UH |
1796 | if (device_may_wakeup(dev)) |
1797 | dev->power.wakeup_path = true; | |
1798 | ||
c23bd387 UH |
1799 | dpm_propagate_wakeup_to_parent(dev); |
1800 | dpm_clear_superiors_direct_complete(dev); | |
4ca46ff3 | 1801 | } |
6d0e0e84 | 1802 | |
8e9394ce | 1803 | device_unlock(dev); |
70fea60d | 1804 | dpm_watchdog_clear(&wd); |
1f758b23 MSB |
1805 | |
1806 | Complete: | |
88d26136 | 1807 | if (error) |
098dff73 RW |
1808 | async_error = error; |
1809 | ||
05a92622 | 1810 | complete_all(&dev->power.completion); |
431d452a | 1811 | TRACE_SUSPEND(error); |
cd59abfc AS |
1812 | return error; |
1813 | } | |
1814 | ||
5af84b82 RW |
1815 | static void async_suspend(void *data, async_cookie_t cookie) |
1816 | { | |
1817 | struct device *dev = (struct device *)data; | |
1818 | int error; | |
1819 | ||
1820 | error = __device_suspend(dev, pm_transition, true); | |
2a77c46d SL |
1821 | if (error) { |
1822 | dpm_save_failed_dev(dev_name(dev)); | |
5af84b82 | 1823 | pm_dev_err(dev, pm_transition, " async", error); |
2a77c46d | 1824 | } |
5af84b82 RW |
1825 | |
1826 | put_device(dev); | |
1827 | } | |
1828 | ||
1829 | static int device_suspend(struct device *dev) | |
1830 | { | |
16735d02 | 1831 | reinit_completion(&dev->power.completion); |
5af84b82 | 1832 | |
431d452a | 1833 | if (is_async(dev)) { |
5af84b82 RW |
1834 | get_device(dev); |
1835 | async_schedule(async_suspend, dev); | |
1836 | return 0; | |
1837 | } | |
1838 | ||
1839 | return __device_suspend(dev, pm_transition, false); | |
1840 | } | |
1841 | ||
cd59abfc | 1842 | /** |
20d652d7 RW |
1843 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
1844 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1845 | */ |
91e7c75b | 1846 | int dpm_suspend(pm_message_t state) |
cd59abfc | 1847 | { |
ecf762b2 | 1848 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
1849 | int error = 0; |
1850 | ||
bb3632c6 | 1851 | trace_suspend_resume(TPS("dpm_suspend"), state.event, true); |
91e7c75b RW |
1852 | might_sleep(); |
1853 | ||
2f0aea93 VK |
1854 | cpufreq_suspend(); |
1855 | ||
cd59abfc | 1856 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
1857 | pm_transition = state; |
1858 | async_error = 0; | |
8a43a9ab RW |
1859 | while (!list_empty(&dpm_prepared_list)) { |
1860 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 1861 | |
1eede070 | 1862 | get_device(dev); |
cd59abfc | 1863 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 1864 | |
5af84b82 | 1865 | error = device_suspend(dev); |
1eede070 | 1866 | |
1b3cbec1 | 1867 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 1868 | if (error) { |
1eede070 | 1869 | pm_dev_err(dev, state, "", error); |
2a77c46d | 1870 | dpm_save_failed_dev(dev_name(dev)); |
1eede070 | 1871 | put_device(dev); |
775b64d2 RW |
1872 | break; |
1873 | } | |
7a8d37a3 | 1874 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1875 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 1876 | put_device(dev); |
5af84b82 RW |
1877 | if (async_error) |
1878 | break; | |
cd59abfc AS |
1879 | } |
1880 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
1881 | async_synchronize_full(); |
1882 | if (!error) | |
1883 | error = async_error; | |
2a77c46d SL |
1884 | if (error) { |
1885 | suspend_stats.failed_suspend++; | |
1886 | dpm_save_failed_step(SUSPEND_SUSPEND); | |
48059c09 RW |
1887 | } |
1888 | dpm_show_time(starttime, state, error, NULL); | |
bb3632c6 | 1889 | trace_suspend_resume(TPS("dpm_suspend"), state.event, false); |
1eede070 RW |
1890 | return error; |
1891 | } | |
1892 | ||
1893 | /** | |
20d652d7 RW |
1894 | * device_prepare - Prepare a device for system power transition. |
1895 | * @dev: Device to handle. | |
1896 | * @state: PM transition of the system being carried out. | |
1897 | * | |
1898 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
1899 | * device may be registered after this function has returned. | |
1eede070 | 1900 | */ |
d1616302 | 1901 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 | 1902 | { |
35cd133c | 1903 | int (*callback)(struct device *) = NULL; |
aae4518b | 1904 | int ret = 0; |
1eede070 | 1905 | |
dbf37414 RW |
1906 | if (dev->power.syscore) |
1907 | return 0; | |
1908 | ||
0d4b54c6 RW |
1909 | WARN_ON(!pm_runtime_enabled(dev) && |
1910 | dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND | | |
1911 | DPM_FLAG_LEAVE_SUSPENDED)); | |
0eab11c9 | 1912 | |
88d26136 AS |
1913 | /* |
1914 | * If a device's parent goes into runtime suspend at the wrong time, | |
1915 | * it won't be possible to resume the device. To prevent this we | |
1916 | * block runtime suspend here, during the prepare phase, and allow | |
1917 | * it again during the complete phase. | |
1918 | */ | |
1919 | pm_runtime_get_noresume(dev); | |
1920 | ||
8e9394ce | 1921 | device_lock(dev); |
1eede070 | 1922 | |
8512220c | 1923 | dev->power.wakeup_path = false; |
4ca46ff3 | 1924 | |
aa8e54b5 TV |
1925 | if (dev->power.no_pm_callbacks) { |
1926 | ret = 1; /* Let device go direct_complete */ | |
1927 | goto unlock; | |
1928 | } | |
1929 | ||
fba1fbf5 | 1930 | if (dev->pm_domain) |
35cd133c | 1931 | callback = dev->pm_domain->ops.prepare; |
fba1fbf5 | 1932 | else if (dev->type && dev->type->pm) |
35cd133c | 1933 | callback = dev->type->pm->prepare; |
fba1fbf5 | 1934 | else if (dev->class && dev->class->pm) |
35cd133c | 1935 | callback = dev->class->pm->prepare; |
fba1fbf5 | 1936 | else if (dev->bus && dev->bus->pm) |
35cd133c | 1937 | callback = dev->bus->pm->prepare; |
35cd133c | 1938 | |
fba1fbf5 | 1939 | if (!callback && dev->driver && dev->driver->pm) |
35cd133c | 1940 | callback = dev->driver->pm->prepare; |
35cd133c | 1941 | |
32e8d689 | 1942 | if (callback) |
aae4518b | 1943 | ret = callback(dev); |
7538e3db | 1944 | |
aa8e54b5 | 1945 | unlock: |
8e9394ce | 1946 | device_unlock(dev); |
1eede070 | 1947 | |
aae4518b RW |
1948 | if (ret < 0) { |
1949 | suspend_report_result(callback, ret); | |
aa1b9f13 | 1950 | pm_runtime_put(dev); |
aae4518b RW |
1951 | return ret; |
1952 | } | |
1953 | /* | |
1954 | * A positive return value from ->prepare() means "this device appears | |
1955 | * to be runtime-suspended and its state is fine, so if it really is | |
1956 | * runtime-suspended, you can leave it in that state provided that you | |
1957 | * will do the same thing with all of its descendants". This only | |
1958 | * applies to suspend transitions, however. | |
1959 | */ | |
1960 | spin_lock_irq(&dev->power.lock); | |
08810a41 RW |
1961 | dev->power.direct_complete = state.event == PM_EVENT_SUSPEND && |
1962 | pm_runtime_suspended(dev) && ret > 0 && | |
1963 | !dev_pm_test_driver_flags(dev, DPM_FLAG_NEVER_SKIP); | |
aae4518b RW |
1964 | spin_unlock_irq(&dev->power.lock); |
1965 | return 0; | |
1eede070 | 1966 | } |
cd59abfc | 1967 | |
1eede070 | 1968 | /** |
20d652d7 RW |
1969 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1970 | * @state: PM transition of the system being carried out. | |
1eede070 | 1971 | * |
20d652d7 | 1972 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 | 1973 | */ |
91e7c75b | 1974 | int dpm_prepare(pm_message_t state) |
1eede070 | 1975 | { |
1eede070 RW |
1976 | int error = 0; |
1977 | ||
bb3632c6 | 1978 | trace_suspend_resume(TPS("dpm_prepare"), state.event, true); |
91e7c75b RW |
1979 | might_sleep(); |
1980 | ||
013c074f SG |
1981 | /* |
1982 | * Give a chance for the known devices to complete their probes, before | |
1983 | * disable probing of devices. This sync point is important at least | |
1984 | * at boot time + hibernation restore. | |
1985 | */ | |
1986 | wait_for_device_probe(); | |
1987 | /* | |
1988 | * It is unsafe if probing of devices will happen during suspend or | |
1989 | * hibernation and system behavior will be unpredictable in this case. | |
1990 | * So, let's prohibit device's probing here and defer their probes | |
1991 | * instead. The normal behavior will be restored in dpm_complete(). | |
1992 | */ | |
1993 | device_block_probing(); | |
1994 | ||
1eede070 | 1995 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
1996 | while (!list_empty(&dpm_list)) { |
1997 | struct device *dev = to_device(dpm_list.next); | |
1998 | ||
1999 | get_device(dev); | |
1eede070 RW |
2000 | mutex_unlock(&dpm_list_mtx); |
2001 | ||
32e8d689 | 2002 | trace_device_pm_callback_start(dev, "", state.event); |
1e2ef05b | 2003 | error = device_prepare(dev, state); |
32e8d689 | 2004 | trace_device_pm_callback_end(dev, error); |
1eede070 RW |
2005 | |
2006 | mutex_lock(&dpm_list_mtx); | |
2007 | if (error) { | |
1eede070 RW |
2008 | if (error == -EAGAIN) { |
2009 | put_device(dev); | |
886a7a33 | 2010 | error = 0; |
1eede070 RW |
2011 | continue; |
2012 | } | |
1e75227e RW |
2013 | printk(KERN_INFO "PM: Device %s not prepared " |
2014 | "for power transition: code %d\n", | |
5c1a07ab | 2015 | dev_name(dev), error); |
1eede070 RW |
2016 | put_device(dev); |
2017 | break; | |
2018 | } | |
f76b168b | 2019 | dev->power.is_prepared = true; |
1eede070 | 2020 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 2021 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
2022 | put_device(dev); |
2023 | } | |
1eede070 | 2024 | mutex_unlock(&dpm_list_mtx); |
bb3632c6 | 2025 | trace_suspend_resume(TPS("dpm_prepare"), state.event, false); |
cd59abfc AS |
2026 | return error; |
2027 | } | |
2028 | ||
775b64d2 | 2029 | /** |
20d652d7 RW |
2030 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
2031 | * @state: PM transition of the system being carried out. | |
775b64d2 | 2032 | * |
20d652d7 RW |
2033 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
2034 | * callbacks for them. | |
775b64d2 | 2035 | */ |
d1616302 | 2036 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
2037 | { |
2038 | int error; | |
cd59abfc | 2039 | |
1eede070 | 2040 | error = dpm_prepare(state); |
2a77c46d SL |
2041 | if (error) { |
2042 | suspend_stats.failed_prepare++; | |
2043 | dpm_save_failed_step(SUSPEND_PREPARE); | |
2044 | } else | |
1eede070 | 2045 | error = dpm_suspend(state); |
cd59abfc | 2046 | return error; |
cd59abfc | 2047 | } |
d1616302 | 2048 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
2049 | |
2050 | void __suspend_report_result(const char *function, void *fn, int ret) | |
2051 | { | |
c80cfb04 BH |
2052 | if (ret) |
2053 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
2054 | } |
2055 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
2056 | |
2057 | /** | |
2058 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
2059 | * @dev: Device to wait for. | |
2060 | * @subordinate: Device that needs to wait for @dev. | |
2061 | */ | |
098dff73 | 2062 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
2063 | { |
2064 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 2065 | return async_error; |
f8824cee RW |
2066 | } |
2067 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); | |
dfe3212e ML |
2068 | |
2069 | /** | |
2070 | * dpm_for_each_dev - device iterator. | |
2071 | * @data: data for the callback. | |
2072 | * @fn: function to be called for each device. | |
2073 | * | |
2074 | * Iterate over devices in dpm_list, and call @fn for each device, | |
2075 | * passing it @data. | |
2076 | */ | |
2077 | void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) | |
2078 | { | |
2079 | struct device *dev; | |
2080 | ||
2081 | if (!fn) | |
2082 | return; | |
2083 | ||
2084 | device_pm_lock(); | |
2085 | list_for_each_entry(dev, &dpm_list, power.entry) | |
2086 | fn(dev, data); | |
2087 | device_pm_unlock(); | |
2088 | } | |
2089 | EXPORT_SYMBOL_GPL(dpm_for_each_dev); | |
aa8e54b5 TV |
2090 | |
2091 | static bool pm_ops_is_empty(const struct dev_pm_ops *ops) | |
2092 | { | |
2093 | if (!ops) | |
2094 | return true; | |
2095 | ||
2096 | return !ops->prepare && | |
2097 | !ops->suspend && | |
2098 | !ops->suspend_late && | |
2099 | !ops->suspend_noirq && | |
2100 | !ops->resume_noirq && | |
2101 | !ops->resume_early && | |
2102 | !ops->resume && | |
2103 | !ops->complete; | |
2104 | } | |
2105 | ||
2106 | void device_pm_check_callbacks(struct device *dev) | |
2107 | { | |
2108 | spin_lock_irq(&dev->power.lock); | |
2109 | dev->power.no_pm_callbacks = | |
157c460e RW |
2110 | (!dev->bus || (pm_ops_is_empty(dev->bus->pm) && |
2111 | !dev->bus->suspend && !dev->bus->resume)) && | |
a380f2ed | 2112 | (!dev->class || pm_ops_is_empty(dev->class->pm)) && |
aa8e54b5 TV |
2113 | (!dev->type || pm_ops_is_empty(dev->type->pm)) && |
2114 | (!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) && | |
157c460e RW |
2115 | (!dev->driver || (pm_ops_is_empty(dev->driver->pm) && |
2116 | !dev->driver->suspend && !dev->driver->resume)); | |
aa8e54b5 TV |
2117 | spin_unlock_irq(&dev->power.lock); |
2118 | } | |
c4b65157 RW |
2119 | |
2120 | bool dev_pm_smart_suspend_and_suspended(struct device *dev) | |
2121 | { | |
2122 | return dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) && | |
2123 | pm_runtime_status_suspended(dev); | |
2124 | } |