Commit | Line | Data |
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5de363b6 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * drivers/base/power/main.c - Where the driver meets power management. | |
4 | * | |
5 | * Copyright (c) 2003 Patrick Mochel | |
6 | * Copyright (c) 2003 Open Source Development Lab | |
7 | * | |
1da177e4 | 8 | * The driver model core calls device_pm_add() when a device is registered. |
b595076a | 9 | * This will initialize the embedded device_pm_info object in the device |
1da177e4 LT |
10 | * and add it to the list of power-controlled devices. sysfs entries for |
11 | * controlling device power management will also be added. | |
12 | * | |
1eede070 RW |
13 | * A separate list is used for keeping track of power info, because the power |
14 | * domain dependencies may differ from the ancestral dependencies that the | |
15 | * subsystem list maintains. | |
1da177e4 LT |
16 | */ |
17 | ||
7a5bd127 | 18 | #define pr_fmt(fmt) "PM: " fmt |
eb23d91a | 19 | #define dev_fmt pr_fmt |
7a5bd127 | 20 | |
1da177e4 | 21 | #include <linux/device.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> |
b17b0153 | 30 | #include <linux/sched/debug.h> |
5af84b82 | 31 | #include <linux/async.h> |
1e75227e | 32 | #include <linux/suspend.h> |
53644677 | 33 | #include <trace/events/power.h> |
2f0aea93 | 34 | #include <linux/cpufreq.h> |
6e863844 | 35 | #include <linux/devfreq.h> |
70fea60d BG |
36 | #include <linux/timer.h> |
37 | ||
cd59abfc | 38 | #include "../base.h" |
1da177e4 LT |
39 | #include "power.h" |
40 | ||
9cf519d1 RW |
41 | typedef int (*pm_callback_t)(struct device *); |
42 | ||
42beb82e MB |
43 | #define list_for_each_entry_rcu_locked(pos, head, member) \ |
44 | list_for_each_entry_rcu(pos, head, member, \ | |
45 | device_links_read_lock_held()) | |
46 | ||
775b64d2 | 47 | /* |
1eede070 | 48 | * The entries in the dpm_list list are in a depth first order, simply |
775b64d2 RW |
49 | * because children are guaranteed to be discovered after parents, and |
50 | * are inserted at the back of the list on discovery. | |
51 | * | |
8e9394ce GKH |
52 | * Since device_pm_add() may be called with a device lock held, |
53 | * we must never try to acquire a device lock while holding | |
775b64d2 RW |
54 | * dpm_list_mutex. |
55 | */ | |
56 | ||
1eede070 | 57 | LIST_HEAD(dpm_list); |
7664e969 SK |
58 | static LIST_HEAD(dpm_prepared_list); |
59 | static LIST_HEAD(dpm_suspended_list); | |
60 | static LIST_HEAD(dpm_late_early_list); | |
61 | static LIST_HEAD(dpm_noirq_list); | |
1da177e4 | 62 | |
cd59abfc | 63 | static DEFINE_MUTEX(dpm_list_mtx); |
5af84b82 | 64 | static pm_message_t pm_transition; |
1da177e4 | 65 | |
098dff73 RW |
66 | static int async_error; |
67 | ||
952856db | 68 | static const char *pm_verb(int event) |
53644677 SK |
69 | { |
70 | switch (event) { | |
71 | case PM_EVENT_SUSPEND: | |
72 | return "suspend"; | |
73 | case PM_EVENT_RESUME: | |
74 | return "resume"; | |
75 | case PM_EVENT_FREEZE: | |
76 | return "freeze"; | |
77 | case PM_EVENT_QUIESCE: | |
78 | return "quiesce"; | |
79 | case PM_EVENT_HIBERNATE: | |
80 | return "hibernate"; | |
81 | case PM_EVENT_THAW: | |
82 | return "thaw"; | |
83 | case PM_EVENT_RESTORE: | |
84 | return "restore"; | |
85 | case PM_EVENT_RECOVER: | |
86 | return "recover"; | |
87 | default: | |
88 | return "(unknown PM event)"; | |
89 | } | |
90 | } | |
91 | ||
5e928f77 | 92 | /** |
e91c11b1 | 93 | * device_pm_sleep_init - Initialize system suspend-related device fields. |
5e928f77 RW |
94 | * @dev: Device object being initialized. |
95 | */ | |
e91c11b1 | 96 | void device_pm_sleep_init(struct device *dev) |
5e928f77 | 97 | { |
f76b168b | 98 | dev->power.is_prepared = false; |
6d0e0e84 | 99 | dev->power.is_suspended = false; |
3d2699bc LC |
100 | dev->power.is_noirq_suspended = false; |
101 | dev->power.is_late_suspended = false; | |
5af84b82 | 102 | init_completion(&dev->power.completion); |
152e1d59 | 103 | complete_all(&dev->power.completion); |
074037ec | 104 | dev->power.wakeup = NULL; |
22110faf | 105 | INIT_LIST_HEAD(&dev->power.entry); |
5e928f77 RW |
106 | } |
107 | ||
1eede070 | 108 | /** |
20d652d7 | 109 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
110 | */ |
111 | void device_pm_lock(void) | |
112 | { | |
113 | mutex_lock(&dpm_list_mtx); | |
114 | } | |
115 | ||
116 | /** | |
20d652d7 | 117 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
118 | */ |
119 | void device_pm_unlock(void) | |
120 | { | |
121 | mutex_unlock(&dpm_list_mtx); | |
122 | } | |
075c1771 | 123 | |
775b64d2 | 124 | /** |
20d652d7 RW |
125 | * device_pm_add - Add a device to the PM core's list of active devices. |
126 | * @dev: Device to add to the list. | |
775b64d2 | 127 | */ |
3b98aeaf | 128 | void device_pm_add(struct device *dev) |
1da177e4 | 129 | { |
85945c28 SH |
130 | /* Skip PM setup/initialization. */ |
131 | if (device_pm_not_required(dev)) | |
132 | return; | |
133 | ||
7a5bd127 | 134 | pr_debug("Adding info for %s:%s\n", |
5c1a07ab | 135 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
aa8e54b5 | 136 | device_pm_check_callbacks(dev); |
11048dcf | 137 | mutex_lock(&dpm_list_mtx); |
f76b168b | 138 | if (dev->parent && dev->parent->power.is_prepared) |
b64959e6 RW |
139 | dev_warn(dev, "parent %s should not be sleeping\n", |
140 | dev_name(dev->parent)); | |
3b98aeaf | 141 | list_add_tail(&dev->power.entry, &dpm_list); |
9ed98953 | 142 | dev->power.in_dpm_list = true; |
1a9a9152 | 143 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
144 | } |
145 | ||
775b64d2 | 146 | /** |
20d652d7 RW |
147 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
148 | * @dev: Device to be removed from the list. | |
775b64d2 | 149 | */ |
9cddad77 | 150 | void device_pm_remove(struct device *dev) |
1da177e4 | 151 | { |
85945c28 SH |
152 | if (device_pm_not_required(dev)) |
153 | return; | |
154 | ||
7a5bd127 | 155 | pr_debug("Removing info for %s:%s\n", |
5c1a07ab | 156 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
5af84b82 | 157 | complete_all(&dev->power.completion); |
11048dcf | 158 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 159 | list_del_init(&dev->power.entry); |
9ed98953 | 160 | dev->power.in_dpm_list = false; |
11048dcf | 161 | mutex_unlock(&dpm_list_mtx); |
074037ec | 162 | device_wakeup_disable(dev); |
5e928f77 | 163 | pm_runtime_remove(dev); |
aa8e54b5 | 164 | device_pm_check_callbacks(dev); |
775b64d2 RW |
165 | } |
166 | ||
ffa6a705 | 167 | /** |
20d652d7 RW |
168 | * device_pm_move_before - Move device in the PM core's list of active devices. |
169 | * @deva: Device to move in dpm_list. | |
170 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
171 | */ |
172 | void device_pm_move_before(struct device *deva, struct device *devb) | |
173 | { | |
7a5bd127 | 174 | pr_debug("Moving %s:%s before %s:%s\n", |
5c1a07ab RW |
175 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
176 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
177 | /* Delete deva from dpm_list and reinsert before devb. */ |
178 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
179 | } | |
180 | ||
181 | /** | |
20d652d7 RW |
182 | * device_pm_move_after - Move device in the PM core's list of active devices. |
183 | * @deva: Device to move in dpm_list. | |
184 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
185 | */ |
186 | void device_pm_move_after(struct device *deva, struct device *devb) | |
187 | { | |
7a5bd127 | 188 | pr_debug("Moving %s:%s after %s:%s\n", |
5c1a07ab RW |
189 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
190 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
191 | /* Delete deva from dpm_list and reinsert after devb. */ |
192 | list_move(&deva->power.entry, &devb->power.entry); | |
193 | } | |
194 | ||
195 | /** | |
20d652d7 RW |
196 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
197 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
198 | */ |
199 | void device_pm_move_last(struct device *dev) | |
200 | { | |
7a5bd127 | 201 | pr_debug("Moving %s:%s to end of list\n", |
5c1a07ab | 202 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
ffa6a705 CH |
203 | list_move_tail(&dev->power.entry, &dpm_list); |
204 | } | |
205 | ||
7f817ba9 | 206 | static ktime_t initcall_debug_start(struct device *dev, void *cb) |
875ab0b7 | 207 | { |
143711f0 BH |
208 | if (!pm_print_times_enabled) |
209 | return 0; | |
875ab0b7 | 210 | |
d75f773c | 211 | dev_info(dev, "calling %pS @ %i, parent: %s\n", cb, |
7f817ba9 BH |
212 | task_pid_nr(current), |
213 | dev->parent ? dev_name(dev->parent) : "none"); | |
143711f0 | 214 | return ktime_get(); |
875ab0b7 RW |
215 | } |
216 | ||
217 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
7f817ba9 | 218 | void *cb, int error) |
875ab0b7 | 219 | { |
53644677 | 220 | ktime_t rettime; |
53644677 | 221 | |
143711f0 BH |
222 | if (!pm_print_times_enabled) |
223 | return; | |
224 | ||
53644677 | 225 | rettime = ktime_get(); |
d75f773c | 226 | dev_info(dev, "%pS returned %d after %Ld usecs\n", cb, error, |
75674eb0 | 227 | (unsigned long long)ktime_us_delta(rettime, calltime)); |
875ab0b7 RW |
228 | } |
229 | ||
5af84b82 RW |
230 | /** |
231 | * dpm_wait - Wait for a PM operation to complete. | |
232 | * @dev: Device to wait for. | |
233 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
234 | */ | |
235 | static void dpm_wait(struct device *dev, bool async) | |
236 | { | |
237 | if (!dev) | |
238 | return; | |
239 | ||
0e06b4a8 | 240 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
241 | wait_for_completion(&dev->power.completion); |
242 | } | |
243 | ||
244 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
245 | { | |
246 | dpm_wait(dev, *((bool *)async_ptr)); | |
247 | return 0; | |
248 | } | |
249 | ||
250 | static void dpm_wait_for_children(struct device *dev, bool async) | |
251 | { | |
252 | device_for_each_child(dev, &async, dpm_wait_fn); | |
253 | } | |
254 | ||
8c73b428 RW |
255 | static void dpm_wait_for_suppliers(struct device *dev, bool async) |
256 | { | |
257 | struct device_link *link; | |
258 | int idx; | |
259 | ||
260 | idx = device_links_read_lock(); | |
261 | ||
262 | /* | |
263 | * If the supplier goes away right after we've checked the link to it, | |
264 | * we'll wait for its completion to change the state, but that's fine, | |
265 | * because the only things that will block as a result are the SRCU | |
266 | * callbacks freeing the link objects for the links in the list we're | |
267 | * walking. | |
268 | */ | |
42beb82e | 269 | list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node) |
8c73b428 RW |
270 | if (READ_ONCE(link->status) != DL_STATE_DORMANT) |
271 | dpm_wait(link->supplier, async); | |
272 | ||
273 | device_links_read_unlock(idx); | |
274 | } | |
275 | ||
0552e05f | 276 | static bool dpm_wait_for_superior(struct device *dev, bool async) |
8c73b428 | 277 | { |
0552e05f RW |
278 | struct device *parent; |
279 | ||
280 | /* | |
281 | * If the device is resumed asynchronously and the parent's callback | |
282 | * deletes both the device and the parent itself, the parent object may | |
283 | * be freed while this function is running, so avoid that by reference | |
284 | * counting the parent once more unless the device has been deleted | |
285 | * already (in which case return right away). | |
286 | */ | |
287 | mutex_lock(&dpm_list_mtx); | |
288 | ||
289 | if (!device_pm_initialized(dev)) { | |
290 | mutex_unlock(&dpm_list_mtx); | |
291 | return false; | |
292 | } | |
293 | ||
294 | parent = get_device(dev->parent); | |
295 | ||
296 | mutex_unlock(&dpm_list_mtx); | |
297 | ||
298 | dpm_wait(parent, async); | |
299 | put_device(parent); | |
300 | ||
8c73b428 | 301 | dpm_wait_for_suppliers(dev, async); |
0552e05f RW |
302 | |
303 | /* | |
304 | * If the parent's callback has deleted the device, attempting to resume | |
305 | * it would be invalid, so avoid doing that then. | |
306 | */ | |
307 | return device_pm_initialized(dev); | |
8c73b428 RW |
308 | } |
309 | ||
310 | static void dpm_wait_for_consumers(struct device *dev, bool async) | |
311 | { | |
312 | struct device_link *link; | |
313 | int idx; | |
314 | ||
315 | idx = device_links_read_lock(); | |
316 | ||
317 | /* | |
318 | * The status of a device link can only be changed from "dormant" by a | |
319 | * probe, but that cannot happen during system suspend/resume. In | |
320 | * theory it can change to "dormant" at that time, but then it is | |
321 | * reasonable to wait for the target device anyway (eg. if it goes | |
322 | * away, it's better to wait for it to go away completely and then | |
323 | * continue instead of trying to continue in parallel with its | |
324 | * unregistration). | |
325 | */ | |
42beb82e | 326 | list_for_each_entry_rcu_locked(link, &dev->links.consumers, s_node) |
8c73b428 RW |
327 | if (READ_ONCE(link->status) != DL_STATE_DORMANT) |
328 | dpm_wait(link->consumer, async); | |
329 | ||
330 | device_links_read_unlock(idx); | |
331 | } | |
332 | ||
333 | static void dpm_wait_for_subordinate(struct device *dev, bool async) | |
334 | { | |
335 | dpm_wait_for_children(dev, async); | |
336 | dpm_wait_for_consumers(dev, async); | |
337 | } | |
338 | ||
1eede070 | 339 | /** |
9cf519d1 | 340 | * pm_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
341 | * @ops: PM operations to choose from. |
342 | * @state: PM transition of the system being carried out. | |
1eede070 | 343 | */ |
9cf519d1 | 344 | static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 345 | { |
1eede070 RW |
346 | switch (state.event) { |
347 | #ifdef CONFIG_SUSPEND | |
348 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 349 | return ops->suspend; |
1eede070 | 350 | case PM_EVENT_RESUME: |
9cf519d1 | 351 | return ops->resume; |
1eede070 | 352 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 353 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
354 | case PM_EVENT_FREEZE: |
355 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 356 | return ops->freeze; |
1eede070 | 357 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 358 | return ops->poweroff; |
1eede070 RW |
359 | case PM_EVENT_THAW: |
360 | case PM_EVENT_RECOVER: | |
9cf519d1 | 361 | return ops->thaw; |
1eede070 | 362 | case PM_EVENT_RESTORE: |
9cf519d1 | 363 | return ops->restore; |
1f112cee | 364 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 365 | } |
f2511774 | 366 | |
9cf519d1 | 367 | return NULL; |
1eede070 RW |
368 | } |
369 | ||
cf579dfb RW |
370 | /** |
371 | * pm_late_early_op - Return the PM operation appropriate for given PM event. | |
372 | * @ops: PM operations to choose from. | |
373 | * @state: PM transition of the system being carried out. | |
374 | * | |
375 | * Runtime PM is disabled for @dev while this function is being executed. | |
376 | */ | |
377 | static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops, | |
378 | pm_message_t state) | |
379 | { | |
380 | switch (state.event) { | |
381 | #ifdef CONFIG_SUSPEND | |
382 | case PM_EVENT_SUSPEND: | |
383 | return ops->suspend_late; | |
384 | case PM_EVENT_RESUME: | |
385 | return ops->resume_early; | |
386 | #endif /* CONFIG_SUSPEND */ | |
387 | #ifdef CONFIG_HIBERNATE_CALLBACKS | |
388 | case PM_EVENT_FREEZE: | |
389 | case PM_EVENT_QUIESCE: | |
390 | return ops->freeze_late; | |
391 | case PM_EVENT_HIBERNATE: | |
392 | return ops->poweroff_late; | |
393 | case PM_EVENT_THAW: | |
394 | case PM_EVENT_RECOVER: | |
395 | return ops->thaw_early; | |
396 | case PM_EVENT_RESTORE: | |
397 | return ops->restore_early; | |
398 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ | |
399 | } | |
400 | ||
401 | return NULL; | |
402 | } | |
403 | ||
1eede070 | 404 | /** |
9cf519d1 | 405 | * pm_noirq_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
406 | * @ops: PM operations to choose from. |
407 | * @state: PM transition of the system being carried out. | |
1eede070 | 408 | * |
20d652d7 RW |
409 | * The driver of @dev will not receive interrupts while this function is being |
410 | * executed. | |
1eede070 | 411 | */ |
9cf519d1 | 412 | static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 413 | { |
1eede070 RW |
414 | switch (state.event) { |
415 | #ifdef CONFIG_SUSPEND | |
416 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 417 | return ops->suspend_noirq; |
1eede070 | 418 | case PM_EVENT_RESUME: |
9cf519d1 | 419 | return ops->resume_noirq; |
1eede070 | 420 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 421 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
422 | case PM_EVENT_FREEZE: |
423 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 424 | return ops->freeze_noirq; |
1eede070 | 425 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 426 | return ops->poweroff_noirq; |
1eede070 RW |
427 | case PM_EVENT_THAW: |
428 | case PM_EVENT_RECOVER: | |
9cf519d1 | 429 | return ops->thaw_noirq; |
1eede070 | 430 | case PM_EVENT_RESTORE: |
9cf519d1 | 431 | return ops->restore_noirq; |
1f112cee | 432 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 433 | } |
f2511774 | 434 | |
9cf519d1 | 435 | return NULL; |
1eede070 RW |
436 | } |
437 | ||
e3771fa9 | 438 | static void pm_dev_dbg(struct device *dev, pm_message_t state, const char *info) |
1eede070 | 439 | { |
f39ee99f | 440 | dev_dbg(dev, "%s%s%s driver flags: %x\n", info, pm_verb(state.event), |
1eede070 | 441 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? |
f39ee99f | 442 | ", may wakeup" : "", dev->power.driver_flags); |
1eede070 RW |
443 | } |
444 | ||
e3771fa9 | 445 | static void pm_dev_err(struct device *dev, pm_message_t state, const char *info, |
1eede070 RW |
446 | int error) |
447 | { | |
eb23d91a BH |
448 | dev_err(dev, "failed to %s%s: error %d\n", pm_verb(state.event), info, |
449 | error); | |
1eede070 RW |
450 | } |
451 | ||
48059c09 | 452 | static void dpm_show_time(ktime_t starttime, pm_message_t state, int error, |
e3771fa9 | 453 | const char *info) |
ecf762b2 RW |
454 | { |
455 | ktime_t calltime; | |
0702d9ee | 456 | u64 usecs64; |
ecf762b2 RW |
457 | int usecs; |
458 | ||
459 | calltime = ktime_get(); | |
460 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
461 | do_div(usecs64, NSEC_PER_USEC); | |
462 | usecs = usecs64; | |
463 | if (usecs == 0) | |
464 | usecs = 1; | |
8d8b2441 | 465 | |
48059c09 | 466 | pm_pr_dbg("%s%s%s of devices %s after %ld.%03ld msecs\n", |
8d8b2441 | 467 | info ?: "", info ? " " : "", pm_verb(state.event), |
48059c09 | 468 | error ? "aborted" : "complete", |
8d8b2441 | 469 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); |
ecf762b2 RW |
470 | } |
471 | ||
9cf519d1 | 472 | static int dpm_run_callback(pm_callback_t cb, struct device *dev, |
e3771fa9 | 473 | pm_message_t state, const char *info) |
9cf519d1 RW |
474 | { |
475 | ktime_t calltime; | |
476 | int error; | |
477 | ||
478 | if (!cb) | |
479 | return 0; | |
480 | ||
7f817ba9 | 481 | calltime = initcall_debug_start(dev, cb); |
9cf519d1 RW |
482 | |
483 | pm_dev_dbg(dev, state, info); | |
e8bca479 | 484 | trace_device_pm_callback_start(dev, info, state.event); |
9cf519d1 | 485 | error = cb(dev); |
e8bca479 | 486 | trace_device_pm_callback_end(dev, error); |
a759de69 | 487 | suspend_report_result(dev, cb, error); |
9cf519d1 | 488 | |
7f817ba9 | 489 | initcall_debug_report(dev, calltime, cb, error); |
9cf519d1 RW |
490 | |
491 | return error; | |
492 | } | |
493 | ||
70fea60d BG |
494 | #ifdef CONFIG_DPM_WATCHDOG |
495 | struct dpm_watchdog { | |
496 | struct device *dev; | |
497 | struct task_struct *tsk; | |
498 | struct timer_list timer; | |
499 | }; | |
500 | ||
501 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \ | |
502 | struct dpm_watchdog wd | |
503 | ||
504 | /** | |
505 | * dpm_watchdog_handler - Driver suspend / resume watchdog handler. | |
c4a586fd | 506 | * @t: The timer that PM watchdog depends on. |
70fea60d BG |
507 | * |
508 | * Called when a driver has timed out suspending or resuming. | |
509 | * There's not much we can do here to recover so panic() to | |
510 | * capture a crash-dump in pstore. | |
511 | */ | |
9c6c273a | 512 | static void dpm_watchdog_handler(struct timer_list *t) |
70fea60d | 513 | { |
9c6c273a | 514 | struct dpm_watchdog *wd = from_timer(wd, t, timer); |
70fea60d BG |
515 | |
516 | dev_emerg(wd->dev, "**** DPM device timeout ****\n"); | |
9cb8f069 | 517 | show_stack(wd->tsk, NULL, KERN_EMERG); |
70fea60d BG |
518 | panic("%s %s: unrecoverable failure\n", |
519 | dev_driver_string(wd->dev), dev_name(wd->dev)); | |
520 | } | |
521 | ||
522 | /** | |
523 | * dpm_watchdog_set - Enable pm watchdog for given device. | |
524 | * @wd: Watchdog. Must be allocated on the stack. | |
525 | * @dev: Device to handle. | |
526 | */ | |
527 | static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev) | |
528 | { | |
529 | struct timer_list *timer = &wd->timer; | |
530 | ||
531 | wd->dev = dev; | |
532 | wd->tsk = current; | |
533 | ||
9c6c273a | 534 | timer_setup_on_stack(timer, dpm_watchdog_handler, 0); |
70fea60d BG |
535 | /* use same timeout value for both suspend and resume */ |
536 | timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT; | |
70fea60d BG |
537 | add_timer(timer); |
538 | } | |
539 | ||
540 | /** | |
541 | * dpm_watchdog_clear - Disable suspend/resume watchdog. | |
542 | * @wd: Watchdog to disable. | |
543 | */ | |
544 | static void dpm_watchdog_clear(struct dpm_watchdog *wd) | |
545 | { | |
546 | struct timer_list *timer = &wd->timer; | |
547 | ||
548 | del_timer_sync(timer); | |
549 | destroy_timer_on_stack(timer); | |
550 | } | |
551 | #else | |
552 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) | |
553 | #define dpm_watchdog_set(x, y) | |
554 | #define dpm_watchdog_clear(x) | |
555 | #endif | |
556 | ||
cd59abfc AS |
557 | /*------------------------- Resume routines -------------------------*/ |
558 | ||
75e94645 | 559 | /** |
76c70cb5 | 560 | * dev_pm_skip_resume - System-wide device resume optimization check. |
0d4b54c6 RW |
561 | * @dev: Target device. |
562 | * | |
6e176bf8 RW |
563 | * Return: |
564 | * - %false if the transition under way is RESTORE. | |
fa2bfead | 565 | * - Return value of dev_pm_skip_suspend() if the transition under way is THAW. |
6e176bf8 RW |
566 | * - The logical negation of %power.must_resume otherwise (that is, when the |
567 | * transition under way is RESUME). | |
0d4b54c6 | 568 | */ |
76c70cb5 | 569 | bool dev_pm_skip_resume(struct device *dev) |
0d4b54c6 | 570 | { |
6e176bf8 RW |
571 | if (pm_transition.event == PM_EVENT_RESTORE) |
572 | return false; | |
4fa3061a | 573 | |
6e176bf8 | 574 | if (pm_transition.event == PM_EVENT_THAW) |
fa2bfead | 575 | return dev_pm_skip_suspend(dev); |
4fa3061a | 576 | |
6e176bf8 | 577 | return !dev->power.must_resume; |
4fa3061a RW |
578 | } |
579 | ||
9cb1c982 RW |
580 | static bool is_async(struct device *dev) |
581 | { | |
582 | return dev->power.async_suspend && pm_async_enabled | |
583 | && !pm_trace_is_enabled(); | |
584 | } | |
585 | ||
586 | static bool dpm_async_fn(struct device *dev, async_func_t func) | |
587 | { | |
588 | reinit_completion(&dev->power.completion); | |
589 | ||
590 | if (is_async(dev)) { | |
591 | dev->power.async_in_progress = true; | |
592 | ||
593 | get_device(dev); | |
594 | ||
595 | if (async_schedule_dev_nocall(func, dev)) | |
596 | return true; | |
597 | ||
598 | put_device(dev); | |
599 | } | |
600 | /* | |
601 | * Because async_schedule_dev_nocall() above has returned false or it | |
602 | * has not been called at all, func() is not running and it is safe to | |
603 | * update the async_in_progress flag without extra synchronization. | |
604 | */ | |
605 | dev->power.async_in_progress = false; | |
606 | return false; | |
607 | } | |
608 | ||
cd59abfc | 609 | /** |
3e999770 | 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 | */ |
3e999770 | 618 | static void device_resume_noirq(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 619 | { |
30205377 RW |
620 | pm_callback_t callback = NULL; |
621 | const char *info = NULL; | |
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 | ||
0552e05f RW |
634 | if (!dpm_wait_for_superior(dev, async)) |
635 | goto Out; | |
76569faa | 636 | |
76c70cb5 | 637 | skip_resume = dev_pm_skip_resume(dev); |
6e176bf8 RW |
638 | /* |
639 | * If the driver callback is skipped below or by the middle layer | |
640 | * callback and device_resume_early() also skips the driver callback for | |
641 | * this device later, it needs to appear as "suspended" to PM-runtime, | |
642 | * so change its status accordingly. | |
643 | * | |
644 | * Otherwise, the device is going to be resumed, so set its PM-runtime | |
645 | * status to "active", but do that only if DPM_FLAG_SMART_SUSPEND is set | |
646 | * to avoid confusing drivers that don't use it. | |
647 | */ | |
648 | if (skip_resume) | |
649 | pm_runtime_set_suspended(dev); | |
fa2bfead | 650 | else if (dev_pm_skip_suspend(dev)) |
6e176bf8 | 651 | pm_runtime_set_active(dev); |
32bfa56a | 652 | |
30205377 RW |
653 | if (dev->pm_domain) { |
654 | info = "noirq power domain "; | |
655 | callback = pm_noirq_op(&dev->pm_domain->ops, state); | |
656 | } else if (dev->type && dev->type->pm) { | |
657 | info = "noirq type "; | |
658 | callback = pm_noirq_op(dev->type->pm, state); | |
659 | } else if (dev->class && dev->class->pm) { | |
660 | info = "noirq class "; | |
661 | callback = pm_noirq_op(dev->class->pm, state); | |
662 | } else if (dev->bus && dev->bus->pm) { | |
663 | info = "noirq bus "; | |
664 | callback = pm_noirq_op(dev->bus->pm, state); | |
665 | } | |
75e94645 RW |
666 | if (callback) |
667 | goto Run; | |
e7176a37 | 668 | |
32bfa56a RW |
669 | if (skip_resume) |
670 | goto Skip; | |
671 | ||
75e94645 | 672 | if (dev->driver && dev->driver->pm) { |
cf579dfb | 673 | info = "noirq driver "; |
35cd133c RW |
674 | callback = pm_noirq_op(dev->driver->pm, state); |
675 | } | |
676 | ||
75e94645 | 677 | Run: |
9cf519d1 | 678 | error = dpm_run_callback(callback, dev, state, info); |
75e94645 RW |
679 | |
680 | Skip: | |
3d2699bc | 681 | dev->power.is_noirq_suspended = false; |
9cf519d1 | 682 | |
75e94645 | 683 | Out: |
76569faa | 684 | complete_all(&dev->power.completion); |
775b64d2 | 685 | TRACE_RESUME(error); |
7839d007 RW |
686 | |
687 | if (error) { | |
4add3e72 | 688 | async_error = error; |
7839d007 RW |
689 | dpm_save_failed_dev(dev_name(dev)); |
690 | pm_dev_err(dev, state, async ? " async noirq" : " noirq", error); | |
691 | } | |
775b64d2 RW |
692 | } |
693 | ||
76569faa LC |
694 | static void async_resume_noirq(void *data, async_cookie_t cookie) |
695 | { | |
73d73f5e | 696 | struct device *dev = data; |
76569faa | 697 | |
3e999770 | 698 | device_resume_noirq(dev, pm_transition, true); |
76569faa LC |
699 | put_device(dev); |
700 | } | |
701 | ||
b605c44c | 702 | static void dpm_noirq_resume_devices(pm_message_t state) |
775b64d2 | 703 | { |
76569faa | 704 | struct device *dev; |
ecf762b2 | 705 | ktime_t starttime = ktime_get(); |
775b64d2 | 706 | |
bb3632c6 | 707 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, true); |
4add3e72 RW |
708 | |
709 | async_error = 0; | |
710 | ||
32bdfac5 | 711 | mutex_lock(&dpm_list_mtx); |
76569faa | 712 | pm_transition = state; |
d08a5ace | 713 | |
3e999770 RW |
714 | /* |
715 | * Trigger the resume of "async" devices upfront so they don't have to | |
716 | * wait for the "non-async" ones they don't depend on. | |
717 | */ | |
718 | list_for_each_entry(dev, &dpm_noirq_list, power.entry) | |
719 | dpm_async_fn(dev, async_resume_noirq); | |
720 | ||
76569faa LC |
721 | while (!list_empty(&dpm_noirq_list)) { |
722 | dev = to_device(dpm_noirq_list.next); | |
cf579dfb | 723 | list_move_tail(&dev->power.entry, &dpm_late_early_list); |
2aa36604 | 724 | |
3e999770 RW |
725 | if (!dev->power.async_in_progress) { |
726 | get_device(dev); | |
d08a5ace | 727 | |
3e999770 | 728 | mutex_unlock(&dpm_list_mtx); |
cf579dfb | 729 | |
3e999770 | 730 | device_resume_noirq(dev, state, false); |
2aa36604 | 731 | |
3e999770 RW |
732 | put_device(dev); |
733 | ||
734 | mutex_lock(&dpm_list_mtx); | |
735 | } | |
cf579dfb RW |
736 | } |
737 | mutex_unlock(&dpm_list_mtx); | |
76569faa | 738 | async_synchronize_full(); |
48059c09 | 739 | dpm_show_time(starttime, state, 0, "noirq"); |
4add3e72 RW |
740 | if (async_error) |
741 | dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); | |
742 | ||
786f41fb RW |
743 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false); |
744 | } | |
745 | ||
786f41fb RW |
746 | /** |
747 | * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices. | |
748 | * @state: PM transition of the system being carried out. | |
749 | * | |
750 | * Invoke the "noirq" resume callbacks for all devices in dpm_noirq_list and | |
751 | * allow device drivers' interrupt handlers to be called. | |
752 | */ | |
753 | void dpm_resume_noirq(pm_message_t state) | |
754 | { | |
755 | dpm_noirq_resume_devices(state); | |
b605c44c RW |
756 | |
757 | resume_device_irqs(); | |
758 | device_wakeup_disarm_wake_irqs(); | |
cf579dfb RW |
759 | } |
760 | ||
761 | /** | |
3e999770 | 762 | * device_resume_early - Execute an "early resume" callback for given device. |
cf579dfb RW |
763 | * @dev: Device to handle. |
764 | * @state: PM transition of the system being carried out. | |
58c256a3 | 765 | * @async: If true, the device is being resumed asynchronously. |
cf579dfb RW |
766 | * |
767 | * Runtime PM is disabled for @dev while this function is being executed. | |
768 | */ | |
3e999770 | 769 | static void device_resume_early(struct device *dev, pm_message_t state, bool async) |
cf579dfb | 770 | { |
30205377 RW |
771 | pm_callback_t callback = NULL; |
772 | const char *info = NULL; | |
cf579dfb RW |
773 | int error = 0; |
774 | ||
775 | TRACE_DEVICE(dev); | |
776 | TRACE_RESUME(0); | |
777 | ||
aae4518b | 778 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
779 | goto Out; |
780 | ||
3d2699bc LC |
781 | if (!dev->power.is_late_suspended) |
782 | goto Out; | |
783 | ||
0552e05f RW |
784 | if (!dpm_wait_for_superior(dev, async)) |
785 | goto Out; | |
9e5e7910 | 786 | |
30205377 RW |
787 | if (dev->pm_domain) { |
788 | info = "early power domain "; | |
789 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
790 | } else if (dev->type && dev->type->pm) { | |
791 | info = "early type "; | |
792 | callback = pm_late_early_op(dev->type->pm, state); | |
793 | } else if (dev->class && dev->class->pm) { | |
794 | info = "early class "; | |
795 | callback = pm_late_early_op(dev->class->pm, state); | |
796 | } else if (dev->bus && dev->bus->pm) { | |
797 | info = "early bus "; | |
798 | callback = pm_late_early_op(dev->bus->pm, state); | |
6e176bf8 RW |
799 | } |
800 | if (callback) | |
801 | goto Run; | |
802 | ||
76c70cb5 | 803 | if (dev_pm_skip_resume(dev)) |
6e176bf8 | 804 | goto Skip; |
cf579dfb | 805 | |
6e176bf8 | 806 | if (dev->driver && dev->driver->pm) { |
cf579dfb RW |
807 | info = "early driver "; |
808 | callback = pm_late_early_op(dev->driver->pm, state); | |
809 | } | |
810 | ||
6e176bf8 | 811 | Run: |
cf579dfb | 812 | error = dpm_run_callback(callback, dev, state, info); |
6e176bf8 RW |
813 | |
814 | Skip: | |
3d2699bc | 815 | dev->power.is_late_suspended = false; |
cf579dfb | 816 | |
6e176bf8 | 817 | Out: |
cf579dfb | 818 | TRACE_RESUME(error); |
9f6d8f6a RW |
819 | |
820 | pm_runtime_enable(dev); | |
9e5e7910 | 821 | complete_all(&dev->power.completion); |
7839d007 RW |
822 | |
823 | if (error) { | |
4add3e72 | 824 | async_error = error; |
7839d007 RW |
825 | dpm_save_failed_dev(dev_name(dev)); |
826 | pm_dev_err(dev, state, async ? " async early" : " early", error); | |
827 | } | |
cf579dfb RW |
828 | } |
829 | ||
9e5e7910 LC |
830 | static void async_resume_early(void *data, async_cookie_t cookie) |
831 | { | |
73d73f5e | 832 | struct device *dev = data; |
9e5e7910 | 833 | |
3e999770 | 834 | device_resume_early(dev, pm_transition, true); |
9e5e7910 LC |
835 | put_device(dev); |
836 | } | |
837 | ||
cf579dfb RW |
838 | /** |
839 | * dpm_resume_early - Execute "early resume" callbacks for all devices. | |
840 | * @state: PM transition of the system being carried out. | |
841 | */ | |
2a8a8ce6 | 842 | void dpm_resume_early(pm_message_t state) |
cf579dfb | 843 | { |
9e5e7910 | 844 | struct device *dev; |
cf579dfb RW |
845 | ktime_t starttime = ktime_get(); |
846 | ||
bb3632c6 | 847 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, true); |
4add3e72 RW |
848 | |
849 | async_error = 0; | |
850 | ||
cf579dfb | 851 | mutex_lock(&dpm_list_mtx); |
9e5e7910 LC |
852 | pm_transition = state; |
853 | ||
3e999770 RW |
854 | /* |
855 | * Trigger the resume of "async" devices upfront so they don't have to | |
856 | * wait for the "non-async" ones they don't depend on. | |
857 | */ | |
858 | list_for_each_entry(dev, &dpm_late_early_list, power.entry) | |
859 | dpm_async_fn(dev, async_resume_early); | |
860 | ||
9e5e7910 LC |
861 | while (!list_empty(&dpm_late_early_list)) { |
862 | dev = to_device(dpm_late_early_list.next); | |
cf579dfb | 863 | list_move_tail(&dev->power.entry, &dpm_suspended_list); |
2aa36604 | 864 | |
3e999770 RW |
865 | if (!dev->power.async_in_progress) { |
866 | get_device(dev); | |
cf579dfb | 867 | |
3e999770 | 868 | mutex_unlock(&dpm_list_mtx); |
2aa36604 | 869 | |
3e999770 | 870 | device_resume_early(dev, state, false); |
2aa36604 | 871 | |
3e999770 RW |
872 | put_device(dev); |
873 | ||
874 | mutex_lock(&dpm_list_mtx); | |
875 | } | |
d08a5ace | 876 | } |
32bdfac5 | 877 | mutex_unlock(&dpm_list_mtx); |
9e5e7910 | 878 | async_synchronize_full(); |
48059c09 | 879 | dpm_show_time(starttime, state, 0, "early"); |
4add3e72 RW |
880 | if (async_error) |
881 | dpm_save_failed_step(SUSPEND_RESUME_EARLY); | |
882 | ||
bb3632c6 | 883 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, false); |
775b64d2 | 884 | } |
cf579dfb RW |
885 | |
886 | /** | |
887 | * dpm_resume_start - Execute "noirq" and "early" device callbacks. | |
888 | * @state: PM transition of the system being carried out. | |
889 | */ | |
890 | void dpm_resume_start(pm_message_t state) | |
891 | { | |
892 | dpm_resume_noirq(state); | |
893 | dpm_resume_early(state); | |
894 | } | |
895 | EXPORT_SYMBOL_GPL(dpm_resume_start); | |
775b64d2 RW |
896 | |
897 | /** | |
3e999770 | 898 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
899 | * @dev: Device to handle. |
900 | * @state: PM transition of the system being carried out. | |
5af84b82 | 901 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 902 | */ |
3e999770 | 903 | static void device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 904 | { |
9cf519d1 | 905 | pm_callback_t callback = NULL; |
e3771fa9 | 906 | const char *info = NULL; |
775b64d2 | 907 | int error = 0; |
70fea60d | 908 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
775b64d2 RW |
909 | |
910 | TRACE_DEVICE(dev); | |
911 | TRACE_RESUME(0); | |
cd59abfc | 912 | |
dbf37414 RW |
913 | if (dev->power.syscore) |
914 | goto Complete; | |
915 | ||
aae4518b RW |
916 | if (dev->power.direct_complete) { |
917 | /* Match the pm_runtime_disable() in __device_suspend(). */ | |
918 | pm_runtime_enable(dev); | |
919 | goto Complete; | |
920 | } | |
921 | ||
0552e05f RW |
922 | if (!dpm_wait_for_superior(dev, async)) |
923 | goto Complete; | |
924 | ||
70fea60d | 925 | dpm_watchdog_set(&wd, dev); |
8e9394ce | 926 | device_lock(dev); |
7a8d37a3 | 927 | |
f76b168b AS |
928 | /* |
929 | * This is a fib. But we'll allow new children to be added below | |
930 | * a resumed device, even if the device hasn't been completed yet. | |
931 | */ | |
932 | dev->power.is_prepared = false; | |
97df8c12 | 933 | |
6d0e0e84 AS |
934 | if (!dev->power.is_suspended) |
935 | goto Unlock; | |
936 | ||
564b905a | 937 | if (dev->pm_domain) { |
9cf519d1 RW |
938 | info = "power domain "; |
939 | callback = pm_op(&dev->pm_domain->ops, state); | |
35cd133c | 940 | goto Driver; |
7538e3db RW |
941 | } |
942 | ||
9659cc06 | 943 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
944 | info = "type "; |
945 | callback = pm_op(dev->type->pm, state); | |
35cd133c | 946 | goto Driver; |
cd59abfc AS |
947 | } |
948 | ||
a380f2ed RW |
949 | if (dev->class && dev->class->pm) { |
950 | info = "class "; | |
951 | callback = pm_op(dev->class->pm, state); | |
952 | goto Driver; | |
cd59abfc | 953 | } |
9659cc06 RW |
954 | |
955 | if (dev->bus) { | |
956 | if (dev->bus->pm) { | |
35cd133c | 957 | info = "bus "; |
9cf519d1 | 958 | callback = pm_op(dev->bus->pm, state); |
9659cc06 | 959 | } else if (dev->bus->resume) { |
35cd133c | 960 | info = "legacy bus "; |
9cf519d1 | 961 | callback = dev->bus->resume; |
35cd133c | 962 | goto End; |
9659cc06 RW |
963 | } |
964 | } | |
965 | ||
35cd133c RW |
966 | Driver: |
967 | if (!callback && dev->driver && dev->driver->pm) { | |
968 | info = "driver "; | |
969 | callback = pm_op(dev->driver->pm, state); | |
970 | } | |
971 | ||
1eede070 | 972 | End: |
9cf519d1 | 973 | error = dpm_run_callback(callback, dev, state, info); |
6d0e0e84 AS |
974 | dev->power.is_suspended = false; |
975 | ||
976 | Unlock: | |
8e9394ce | 977 | device_unlock(dev); |
70fea60d | 978 | dpm_watchdog_clear(&wd); |
dbf37414 RW |
979 | |
980 | Complete: | |
5af84b82 | 981 | complete_all(&dev->power.completion); |
7a8d37a3 | 982 | |
cd59abfc | 983 | TRACE_RESUME(error); |
1e2ef05b | 984 | |
7839d007 | 985 | if (error) { |
4add3e72 | 986 | async_error = error; |
7839d007 RW |
987 | dpm_save_failed_dev(dev_name(dev)); |
988 | pm_dev_err(dev, state, async ? " async" : "", error); | |
989 | } | |
cd59abfc AS |
990 | } |
991 | ||
5af84b82 RW |
992 | static void async_resume(void *data, async_cookie_t cookie) |
993 | { | |
73d73f5e | 994 | struct device *dev = data; |
5af84b82 | 995 | |
3e999770 | 996 | device_resume(dev, pm_transition, true); |
5af84b82 RW |
997 | put_device(dev); |
998 | } | |
999 | ||
775b64d2 | 1000 | /** |
20d652d7 RW |
1001 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
1002 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1003 | * |
20d652d7 RW |
1004 | * Execute the appropriate "resume" callback for all devices whose status |
1005 | * indicates that they are suspended. | |
1eede070 | 1006 | */ |
91e7c75b | 1007 | void dpm_resume(pm_message_t state) |
1eede070 | 1008 | { |
97df8c12 | 1009 | struct device *dev; |
ecf762b2 | 1010 | ktime_t starttime = ktime_get(); |
1eede070 | 1011 | |
bb3632c6 | 1012 | trace_suspend_resume(TPS("dpm_resume"), state.event, true); |
91e7c75b RW |
1013 | might_sleep(); |
1014 | ||
1eede070 | 1015 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 1016 | pm_transition = state; |
098dff73 | 1017 | async_error = 0; |
1eede070 | 1018 | |
3e999770 RW |
1019 | /* |
1020 | * Trigger the resume of "async" devices upfront so they don't have to | |
1021 | * wait for the "non-async" ones they don't depend on. | |
1022 | */ | |
1023 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) | |
1024 | dpm_async_fn(dev, async_resume); | |
1025 | ||
8a43a9ab RW |
1026 | while (!list_empty(&dpm_suspended_list)) { |
1027 | dev = to_device(dpm_suspended_list.next); | |
86686b8f | 1028 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 | 1029 | |
3e999770 | 1030 | if (!dev->power.async_in_progress) { |
86686b8f RW |
1031 | get_device(dev); |
1032 | ||
3e999770 | 1033 | mutex_unlock(&dpm_list_mtx); |
7839d007 | 1034 | |
3e999770 | 1035 | device_resume(dev, state, false); |
1eede070 | 1036 | |
86686b8f RW |
1037 | put_device(dev); |
1038 | ||
3e999770 RW |
1039 | mutex_lock(&dpm_list_mtx); |
1040 | } | |
1eede070 | 1041 | } |
1eede070 | 1042 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 1043 | async_synchronize_full(); |
48059c09 | 1044 | dpm_show_time(starttime, state, 0, NULL); |
4add3e72 RW |
1045 | if (async_error) |
1046 | dpm_save_failed_step(SUSPEND_RESUME); | |
2f0aea93 VK |
1047 | |
1048 | cpufreq_resume(); | |
6e863844 | 1049 | devfreq_resume(); |
bb3632c6 | 1050 | trace_suspend_resume(TPS("dpm_resume"), state.event, false); |
1eede070 RW |
1051 | } |
1052 | ||
1053 | /** | |
20d652d7 RW |
1054 | * device_complete - Complete a PM transition for given device. |
1055 | * @dev: Device to handle. | |
1056 | * @state: PM transition of the system being carried out. | |
1eede070 | 1057 | */ |
d1616302 | 1058 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 1059 | { |
35cd133c | 1060 | void (*callback)(struct device *) = NULL; |
e3771fa9 | 1061 | const char *info = NULL; |
35cd133c | 1062 | |
dbf37414 | 1063 | if (dev->power.syscore) |
928265e3 | 1064 | goto out; |
dbf37414 | 1065 | |
8e9394ce | 1066 | device_lock(dev); |
1eede070 | 1067 | |
564b905a | 1068 | if (dev->pm_domain) { |
35cd133c RW |
1069 | info = "completing power domain "; |
1070 | callback = dev->pm_domain->ops.complete; | |
4d27e9dc | 1071 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
1072 | info = "completing type "; |
1073 | callback = dev->type->pm->complete; | |
9659cc06 | 1074 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
1075 | info = "completing class "; |
1076 | callback = dev->class->pm->complete; | |
9659cc06 | 1077 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
1078 | info = "completing bus "; |
1079 | callback = dev->bus->pm->complete; | |
1080 | } | |
1081 | ||
1082 | if (!callback && dev->driver && dev->driver->pm) { | |
1083 | info = "completing driver "; | |
1084 | callback = dev->driver->pm->complete; | |
1085 | } | |
1086 | ||
1087 | if (callback) { | |
1088 | pm_dev_dbg(dev, state, info); | |
1089 | callback(dev); | |
1eede070 RW |
1090 | } |
1091 | ||
8e9394ce | 1092 | device_unlock(dev); |
88d26136 | 1093 | |
928265e3 | 1094 | out: |
af939339 | 1095 | pm_runtime_put(dev); |
1eede070 RW |
1096 | } |
1097 | ||
1098 | /** | |
20d652d7 RW |
1099 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
1100 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1101 | * |
20d652d7 RW |
1102 | * Execute the ->complete() callbacks for all devices whose PM status is not |
1103 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 1104 | */ |
91e7c75b | 1105 | void dpm_complete(pm_message_t state) |
cd59abfc | 1106 | { |
1eede070 RW |
1107 | struct list_head list; |
1108 | ||
bb3632c6 | 1109 | trace_suspend_resume(TPS("dpm_complete"), state.event, true); |
91e7c75b RW |
1110 | might_sleep(); |
1111 | ||
1eede070 | 1112 | INIT_LIST_HEAD(&list); |
cd59abfc | 1113 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
1114 | while (!list_empty(&dpm_prepared_list)) { |
1115 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 1116 | |
1eede070 | 1117 | get_device(dev); |
f76b168b | 1118 | dev->power.is_prepared = false; |
5b219a51 | 1119 | list_move(&dev->power.entry, &list); |
2aa36604 | 1120 | |
5b219a51 | 1121 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 1122 | |
32e8d689 | 1123 | trace_device_pm_callback_start(dev, "", state.event); |
5b219a51 | 1124 | device_complete(dev, state); |
32e8d689 | 1125 | trace_device_pm_callback_end(dev, 0); |
1eede070 | 1126 | |
1eede070 | 1127 | put_device(dev); |
2aa36604 RW |
1128 | |
1129 | mutex_lock(&dpm_list_mtx); | |
cd59abfc | 1130 | } |
1eede070 | 1131 | list_splice(&list, &dpm_list); |
cd59abfc | 1132 | mutex_unlock(&dpm_list_mtx); |
013c074f SG |
1133 | |
1134 | /* Allow device probing and trigger re-probing of deferred devices */ | |
1135 | device_unblock_probing(); | |
bb3632c6 | 1136 | trace_suspend_resume(TPS("dpm_complete"), state.event, false); |
cd59abfc AS |
1137 | } |
1138 | ||
cd59abfc | 1139 | /** |
20d652d7 RW |
1140 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
1141 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1142 | * |
20d652d7 RW |
1143 | * Execute "resume" callbacks for all devices and complete the PM transition of |
1144 | * the system. | |
cd59abfc | 1145 | */ |
d1616302 | 1146 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 1147 | { |
1eede070 RW |
1148 | dpm_resume(state); |
1149 | dpm_complete(state); | |
cd59abfc | 1150 | } |
d1616302 | 1151 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
1152 | |
1153 | ||
1154 | /*------------------------- Suspend routines -------------------------*/ | |
1155 | ||
1eede070 | 1156 | /** |
20d652d7 RW |
1157 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
1158 | * @sleep_state: PM message representing a sleep state. | |
1159 | * | |
1160 | * Return a PM message representing the resume event corresponding to given | |
1161 | * sleep state. | |
1eede070 RW |
1162 | */ |
1163 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 1164 | { |
1eede070 RW |
1165 | switch (sleep_state.event) { |
1166 | case PM_EVENT_SUSPEND: | |
1167 | return PMSG_RESUME; | |
1168 | case PM_EVENT_FREEZE: | |
1169 | case PM_EVENT_QUIESCE: | |
1170 | return PMSG_RECOVER; | |
1171 | case PM_EVENT_HIBERNATE: | |
1172 | return PMSG_RESTORE; | |
cd59abfc | 1173 | } |
1eede070 | 1174 | return PMSG_ON; |
cd59abfc AS |
1175 | } |
1176 | ||
0d4b54c6 RW |
1177 | static void dpm_superior_set_must_resume(struct device *dev) |
1178 | { | |
1179 | struct device_link *link; | |
1180 | int idx; | |
1181 | ||
1182 | if (dev->parent) | |
1183 | dev->parent->power.must_resume = true; | |
1184 | ||
1185 | idx = device_links_read_lock(); | |
1186 | ||
42beb82e | 1187 | list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node) |
0d4b54c6 RW |
1188 | link->supplier->power.must_resume = true; |
1189 | ||
1190 | device_links_read_unlock(idx); | |
1191 | } | |
1192 | ||
cd59abfc | 1193 | /** |
b082ddd8 | 1194 | * __device_suspend_noirq - Execute a "noirq suspend" callback for given device. |
20d652d7 RW |
1195 | * @dev: Device to handle. |
1196 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1197 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1198 | * |
20d652d7 RW |
1199 | * The driver of @dev will not receive interrupts while this function is being |
1200 | * executed. | |
cd59abfc | 1201 | */ |
28b6fd6e | 1202 | static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 1203 | { |
30205377 RW |
1204 | pm_callback_t callback = NULL; |
1205 | const char *info = NULL; | |
28b6fd6e LC |
1206 | int error = 0; |
1207 | ||
431d452a ZF |
1208 | TRACE_DEVICE(dev); |
1209 | TRACE_SUSPEND(0); | |
1210 | ||
098c3055 | 1211 | dpm_wait_for_subordinate(dev, async); |
6f75c3fd | 1212 | |
28b6fd6e LC |
1213 | if (async_error) |
1214 | goto Complete; | |
1215 | ||
aae4518b | 1216 | if (dev->power.syscore || dev->power.direct_complete) |
28b6fd6e LC |
1217 | goto Complete; |
1218 | ||
30205377 RW |
1219 | if (dev->pm_domain) { |
1220 | info = "noirq power domain "; | |
1221 | callback = pm_noirq_op(&dev->pm_domain->ops, state); | |
1222 | } else if (dev->type && dev->type->pm) { | |
1223 | info = "noirq type "; | |
1224 | callback = pm_noirq_op(dev->type->pm, state); | |
1225 | } else if (dev->class && dev->class->pm) { | |
1226 | info = "noirq class "; | |
1227 | callback = pm_noirq_op(dev->class->pm, state); | |
1228 | } else if (dev->bus && dev->bus->pm) { | |
1229 | info = "noirq bus "; | |
1230 | callback = pm_noirq_op(dev->bus->pm, state); | |
1231 | } | |
75e94645 RW |
1232 | if (callback) |
1233 | goto Run; | |
7538e3db | 1234 | |
fa2bfead | 1235 | if (dev_pm_skip_suspend(dev)) |
75e94645 RW |
1236 | goto Skip; |
1237 | ||
1238 | if (dev->driver && dev->driver->pm) { | |
cf579dfb | 1239 | info = "noirq driver "; |
35cd133c RW |
1240 | callback = pm_noirq_op(dev->driver->pm, state); |
1241 | } | |
1242 | ||
75e94645 | 1243 | Run: |
3d2699bc | 1244 | error = dpm_run_callback(callback, dev, state, info); |
0d4b54c6 | 1245 | if (error) { |
28b6fd6e | 1246 | async_error = error; |
ac6f87aa RW |
1247 | dpm_save_failed_dev(dev_name(dev)); |
1248 | pm_dev_err(dev, state, async ? " async noirq" : " noirq", error); | |
0d4b54c6 RW |
1249 | goto Complete; |
1250 | } | |
1251 | ||
75e94645 | 1252 | Skip: |
0d4b54c6 RW |
1253 | dev->power.is_noirq_suspended = true; |
1254 | ||
107d47b2 RW |
1255 | /* |
1256 | * Skipping the resume of devices that were in use right before the | |
1257 | * system suspend (as indicated by their PM-runtime usage counters) | |
1258 | * would be suboptimal. Also resume them if doing that is not allowed | |
1259 | * to be skipped. | |
1260 | */ | |
1261 | if (atomic_read(&dev->power.usage_count) > 1 || | |
2a3f3475 | 1262 | !(dev_pm_test_driver_flags(dev, DPM_FLAG_MAY_SKIP_RESUME) && |
107d47b2 | 1263 | dev->power.may_skip_resume)) |
0d4b54c6 | 1264 | dev->power.must_resume = true; |
0d4b54c6 RW |
1265 | |
1266 | if (dev->power.must_resume) | |
1267 | dpm_superior_set_must_resume(dev); | |
3d2699bc | 1268 | |
28b6fd6e LC |
1269 | Complete: |
1270 | complete_all(&dev->power.completion); | |
431d452a | 1271 | TRACE_SUSPEND(error); |
3d2699bc | 1272 | return error; |
775b64d2 RW |
1273 | } |
1274 | ||
28b6fd6e LC |
1275 | static void async_suspend_noirq(void *data, async_cookie_t cookie) |
1276 | { | |
73d73f5e | 1277 | struct device *dev = data; |
28b6fd6e | 1278 | |
ac6f87aa | 1279 | __device_suspend_noirq(dev, pm_transition, true); |
28b6fd6e LC |
1280 | put_device(dev); |
1281 | } | |
1282 | ||
1283 | static int device_suspend_noirq(struct device *dev) | |
1284 | { | |
f2a424f6 | 1285 | if (dpm_async_fn(dev, async_suspend_noirq)) |
28b6fd6e | 1286 | return 0; |
f2a424f6 | 1287 | |
28b6fd6e LC |
1288 | return __device_suspend_noirq(dev, pm_transition, false); |
1289 | } | |
1290 | ||
b605c44c | 1291 | static int dpm_noirq_suspend_devices(pm_message_t state) |
775b64d2 | 1292 | { |
ecf762b2 | 1293 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
1294 | int error = 0; |
1295 | ||
bb3632c6 | 1296 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true); |
32bdfac5 | 1297 | mutex_lock(&dpm_list_mtx); |
28b6fd6e LC |
1298 | pm_transition = state; |
1299 | async_error = 0; | |
1300 | ||
cf579dfb RW |
1301 | while (!list_empty(&dpm_late_early_list)) { |
1302 | struct device *dev = to_device(dpm_late_early_list.prev); | |
d08a5ace RW |
1303 | |
1304 | get_device(dev); | |
1305 | mutex_unlock(&dpm_list_mtx); | |
1306 | ||
28b6fd6e | 1307 | error = device_suspend_noirq(dev); |
d08a5ace RW |
1308 | |
1309 | mutex_lock(&dpm_list_mtx); | |
2aa36604 | 1310 | |
ac6f87aa | 1311 | if (!error && !list_empty(&dev->power.entry)) |
8a43a9ab | 1312 | list_move(&dev->power.entry, &dpm_noirq_list); |
2aa36604 RW |
1313 | |
1314 | mutex_unlock(&dpm_list_mtx); | |
1315 | ||
d08a5ace | 1316 | put_device(dev); |
52d136cc | 1317 | |
2aa36604 RW |
1318 | mutex_lock(&dpm_list_mtx); |
1319 | ||
1320 | if (error || async_error) | |
52d136cc | 1321 | break; |
775b64d2 | 1322 | } |
32bdfac5 | 1323 | mutex_unlock(&dpm_list_mtx); |
28b6fd6e LC |
1324 | async_synchronize_full(); |
1325 | if (!error) | |
1326 | error = async_error; | |
1327 | ||
b730bab0 | 1328 | if (error) |
28b6fd6e | 1329 | dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); |
b730bab0 | 1330 | |
48059c09 | 1331 | dpm_show_time(starttime, state, error, "noirq"); |
bb3632c6 | 1332 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false); |
cf579dfb RW |
1333 | return error; |
1334 | } | |
1335 | ||
786f41fb RW |
1336 | /** |
1337 | * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices. | |
1338 | * @state: PM transition of the system being carried out. | |
1339 | * | |
1340 | * Prevent device drivers' interrupt handlers from being called and invoke | |
1341 | * "noirq" suspend callbacks for all non-sysdev devices. | |
1342 | */ | |
1343 | int dpm_suspend_noirq(pm_message_t state) | |
1344 | { | |
1345 | int ret; | |
1346 | ||
b605c44c RW |
1347 | device_wakeup_arm_wake_irqs(); |
1348 | suspend_device_irqs(); | |
1349 | ||
786f41fb RW |
1350 | ret = dpm_noirq_suspend_devices(state); |
1351 | if (ret) | |
1352 | dpm_resume_noirq(resume_event(state)); | |
1353 | ||
1354 | return ret; | |
1355 | } | |
1356 | ||
0a99d767 UH |
1357 | static void dpm_propagate_wakeup_to_parent(struct device *dev) |
1358 | { | |
1359 | struct device *parent = dev->parent; | |
1360 | ||
1361 | if (!parent) | |
1362 | return; | |
1363 | ||
1364 | spin_lock_irq(&parent->power.lock); | |
1365 | ||
4e1d9a73 | 1366 | if (device_wakeup_path(dev) && !parent->power.ignore_children) |
0a99d767 UH |
1367 | parent->power.wakeup_path = true; |
1368 | ||
1369 | spin_unlock_irq(&parent->power.lock); | |
1370 | } | |
1371 | ||
cf579dfb | 1372 | /** |
b082ddd8 | 1373 | * __device_suspend_late - Execute a "late suspend" callback for given device. |
cf579dfb RW |
1374 | * @dev: Device to handle. |
1375 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1376 | * @async: If true, the device is being suspended asynchronously. |
cf579dfb RW |
1377 | * |
1378 | * Runtime PM is disabled for @dev while this function is being executed. | |
1379 | */ | |
de377b39 | 1380 | static int __device_suspend_late(struct device *dev, pm_message_t state, bool async) |
cf579dfb | 1381 | { |
30205377 RW |
1382 | pm_callback_t callback = NULL; |
1383 | const char *info = NULL; | |
de377b39 | 1384 | int error = 0; |
cf579dfb | 1385 | |
431d452a ZF |
1386 | TRACE_DEVICE(dev); |
1387 | TRACE_SUSPEND(0); | |
1388 | ||
9f6d8f6a RW |
1389 | __pm_runtime_disable(dev, false); |
1390 | ||
098c3055 | 1391 | dpm_wait_for_subordinate(dev, async); |
6f75c3fd | 1392 | |
de377b39 LC |
1393 | if (async_error) |
1394 | goto Complete; | |
1395 | ||
1396 | if (pm_wakeup_pending()) { | |
1397 | async_error = -EBUSY; | |
1398 | goto Complete; | |
1399 | } | |
1400 | ||
aae4518b | 1401 | if (dev->power.syscore || dev->power.direct_complete) |
de377b39 LC |
1402 | goto Complete; |
1403 | ||
30205377 RW |
1404 | if (dev->pm_domain) { |
1405 | info = "late power domain "; | |
1406 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
1407 | } else if (dev->type && dev->type->pm) { | |
1408 | info = "late type "; | |
1409 | callback = pm_late_early_op(dev->type->pm, state); | |
1410 | } else if (dev->class && dev->class->pm) { | |
1411 | info = "late class "; | |
1412 | callback = pm_late_early_op(dev->class->pm, state); | |
1413 | } else if (dev->bus && dev->bus->pm) { | |
1414 | info = "late bus "; | |
1415 | callback = pm_late_early_op(dev->bus->pm, state); | |
1416 | } | |
75e94645 RW |
1417 | if (callback) |
1418 | goto Run; | |
cf579dfb | 1419 | |
fa2bfead | 1420 | if (dev_pm_skip_suspend(dev)) |
75e94645 RW |
1421 | goto Skip; |
1422 | ||
1423 | if (dev->driver && dev->driver->pm) { | |
cf579dfb RW |
1424 | info = "late driver "; |
1425 | callback = pm_late_early_op(dev->driver->pm, state); | |
1426 | } | |
1427 | ||
75e94645 | 1428 | Run: |
3d2699bc | 1429 | error = dpm_run_callback(callback, dev, state, info); |
75e94645 | 1430 | if (error) { |
de377b39 | 1431 | async_error = error; |
ac6f87aa RW |
1432 | dpm_save_failed_dev(dev_name(dev)); |
1433 | pm_dev_err(dev, state, async ? " async late" : " late", error); | |
75e94645 RW |
1434 | goto Complete; |
1435 | } | |
0a99d767 | 1436 | dpm_propagate_wakeup_to_parent(dev); |
75e94645 RW |
1437 | |
1438 | Skip: | |
1439 | dev->power.is_late_suspended = true; | |
3d2699bc | 1440 | |
de377b39 | 1441 | Complete: |
431d452a | 1442 | TRACE_SUSPEND(error); |
de377b39 | 1443 | complete_all(&dev->power.completion); |
3d2699bc | 1444 | return error; |
cf579dfb RW |
1445 | } |
1446 | ||
de377b39 LC |
1447 | static void async_suspend_late(void *data, async_cookie_t cookie) |
1448 | { | |
73d73f5e | 1449 | struct device *dev = data; |
de377b39 | 1450 | |
ac6f87aa | 1451 | __device_suspend_late(dev, pm_transition, true); |
de377b39 LC |
1452 | put_device(dev); |
1453 | } | |
1454 | ||
1455 | static int device_suspend_late(struct device *dev) | |
1456 | { | |
f2a424f6 | 1457 | if (dpm_async_fn(dev, async_suspend_late)) |
de377b39 | 1458 | return 0; |
de377b39 LC |
1459 | |
1460 | return __device_suspend_late(dev, pm_transition, false); | |
1461 | } | |
1462 | ||
cf579dfb RW |
1463 | /** |
1464 | * dpm_suspend_late - Execute "late suspend" callbacks for all devices. | |
1465 | * @state: PM transition of the system being carried out. | |
1466 | */ | |
2a8a8ce6 | 1467 | int dpm_suspend_late(pm_message_t state) |
cf579dfb RW |
1468 | { |
1469 | ktime_t starttime = ktime_get(); | |
1470 | int error = 0; | |
1471 | ||
bb3632c6 | 1472 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, true); |
a2bd7be1 | 1473 | wake_up_all_idle_cpus(); |
cf579dfb | 1474 | mutex_lock(&dpm_list_mtx); |
de377b39 LC |
1475 | pm_transition = state; |
1476 | async_error = 0; | |
1477 | ||
cf579dfb RW |
1478 | while (!list_empty(&dpm_suspended_list)) { |
1479 | struct device *dev = to_device(dpm_suspended_list.prev); | |
1480 | ||
1481 | get_device(dev); | |
2aa36604 | 1482 | |
cf579dfb RW |
1483 | mutex_unlock(&dpm_list_mtx); |
1484 | ||
de377b39 | 1485 | error = device_suspend_late(dev); |
cf579dfb RW |
1486 | |
1487 | mutex_lock(&dpm_list_mtx); | |
2aa36604 | 1488 | |
3a17fb32 RW |
1489 | if (!list_empty(&dev->power.entry)) |
1490 | list_move(&dev->power.entry, &dpm_late_early_list); | |
1491 | ||
2aa36604 RW |
1492 | mutex_unlock(&dpm_list_mtx); |
1493 | ||
cf579dfb | 1494 | put_device(dev); |
52d136cc | 1495 | |
2aa36604 RW |
1496 | mutex_lock(&dpm_list_mtx); |
1497 | ||
1498 | if (error || async_error) | |
52d136cc | 1499 | break; |
cf579dfb RW |
1500 | } |
1501 | mutex_unlock(&dpm_list_mtx); | |
de377b39 | 1502 | async_synchronize_full(); |
246ef766 ID |
1503 | if (!error) |
1504 | error = async_error; | |
b730bab0 | 1505 | |
de377b39 | 1506 | if (error) { |
de377b39 | 1507 | dpm_save_failed_step(SUSPEND_SUSPEND_LATE); |
cf579dfb | 1508 | dpm_resume_early(resume_event(state)); |
de377b39 | 1509 | } |
48059c09 | 1510 | dpm_show_time(starttime, state, error, "late"); |
bb3632c6 | 1511 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false); |
775b64d2 RW |
1512 | return error; |
1513 | } | |
cf579dfb RW |
1514 | |
1515 | /** | |
1516 | * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks. | |
1517 | * @state: PM transition of the system being carried out. | |
1518 | */ | |
1519 | int dpm_suspend_end(pm_message_t state) | |
1520 | { | |
3540d38d BVA |
1521 | ktime_t starttime = ktime_get(); |
1522 | int error; | |
1523 | ||
1524 | error = dpm_suspend_late(state); | |
064b021f | 1525 | if (error) |
3540d38d | 1526 | goto out; |
064b021f CC |
1527 | |
1528 | error = dpm_suspend_noirq(state); | |
23f62d7a | 1529 | if (error) |
997a0311 | 1530 | dpm_resume_early(resume_event(state)); |
cf579dfb | 1531 | |
3540d38d BVA |
1532 | out: |
1533 | dpm_show_time(starttime, state, error, "end"); | |
1534 | return error; | |
cf579dfb RW |
1535 | } |
1536 | EXPORT_SYMBOL_GPL(dpm_suspend_end); | |
775b64d2 | 1537 | |
875ab0b7 RW |
1538 | /** |
1539 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
1540 | * @dev: Device to suspend. |
1541 | * @state: PM transition of the system being carried out. | |
1542 | * @cb: Suspend callback to execute. | |
58c256a3 | 1543 | * @info: string description of caller. |
875ab0b7 RW |
1544 | */ |
1545 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
53644677 | 1546 | int (*cb)(struct device *dev, pm_message_t state), |
e3771fa9 | 1547 | const char *info) |
875ab0b7 RW |
1548 | { |
1549 | int error; | |
1550 | ktime_t calltime; | |
1551 | ||
7f817ba9 | 1552 | calltime = initcall_debug_start(dev, cb); |
875ab0b7 | 1553 | |
e8bca479 | 1554 | trace_device_pm_callback_start(dev, info, state.event); |
875ab0b7 | 1555 | error = cb(dev, state); |
e8bca479 | 1556 | trace_device_pm_callback_end(dev, error); |
a759de69 | 1557 | suspend_report_result(dev, cb, error); |
875ab0b7 | 1558 | |
7f817ba9 | 1559 | initcall_debug_report(dev, calltime, cb, error); |
875ab0b7 RW |
1560 | |
1561 | return error; | |
1172ee31 UH |
1562 | } |
1563 | ||
c23bd387 | 1564 | static void dpm_clear_superiors_direct_complete(struct device *dev) |
8c73b428 RW |
1565 | { |
1566 | struct device_link *link; | |
1567 | int idx; | |
1568 | ||
c23bd387 UH |
1569 | if (dev->parent) { |
1570 | spin_lock_irq(&dev->parent->power.lock); | |
1571 | dev->parent->power.direct_complete = false; | |
1572 | spin_unlock_irq(&dev->parent->power.lock); | |
1573 | } | |
1574 | ||
8c73b428 RW |
1575 | idx = device_links_read_lock(); |
1576 | ||
42beb82e | 1577 | list_for_each_entry_rcu_locked(link, &dev->links.suppliers, c_node) { |
8c73b428 RW |
1578 | spin_lock_irq(&link->supplier->power.lock); |
1579 | link->supplier->power.direct_complete = false; | |
1580 | spin_unlock_irq(&link->supplier->power.lock); | |
1581 | } | |
1582 | ||
1583 | device_links_read_unlock(idx); | |
1584 | } | |
1585 | ||
775b64d2 | 1586 | /** |
b082ddd8 | 1587 | * __device_suspend - Execute "suspend" callbacks for given device. |
20d652d7 RW |
1588 | * @dev: Device to handle. |
1589 | * @state: PM transition of the system being carried out. | |
5af84b82 | 1590 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1591 | */ |
5af84b82 | 1592 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 1593 | { |
9cf519d1 | 1594 | pm_callback_t callback = NULL; |
e3771fa9 | 1595 | const char *info = NULL; |
cd59abfc | 1596 | int error = 0; |
70fea60d | 1597 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
cd59abfc | 1598 | |
431d452a ZF |
1599 | TRACE_DEVICE(dev); |
1600 | TRACE_SUSPEND(0); | |
1601 | ||
8c73b428 | 1602 | dpm_wait_for_subordinate(dev, async); |
7a8d37a3 | 1603 | |
69e445ab RW |
1604 | if (async_error) { |
1605 | dev->power.direct_complete = false; | |
1f758b23 | 1606 | goto Complete; |
69e445ab | 1607 | } |
1e2ef05b | 1608 | |
88d26136 | 1609 | /* |
e3eb6e8f RW |
1610 | * Wait for possible runtime PM transitions of the device in progress |
1611 | * to complete and if there's a runtime resume request pending for it, | |
1612 | * resume it before proceeding with invoking the system-wide suspend | |
1613 | * callbacks for it. | |
1614 | * | |
1615 | * If the system-wide suspend callbacks below change the configuration | |
1616 | * of the device, they must disable runtime PM for it or otherwise | |
1617 | * ensure that its runtime-resume callbacks will not be confused by that | |
1618 | * change in case they are invoked going forward. | |
88d26136 | 1619 | */ |
e3eb6e8f | 1620 | pm_runtime_barrier(dev); |
5af84b82 | 1621 | |
d83f905e | 1622 | if (pm_wakeup_pending()) { |
69e445ab | 1623 | dev->power.direct_complete = false; |
d83f905e | 1624 | async_error = -EBUSY; |
1f758b23 | 1625 | goto Complete; |
d83f905e RW |
1626 | } |
1627 | ||
dbf37414 RW |
1628 | if (dev->power.syscore) |
1629 | goto Complete; | |
1630 | ||
dc351d4c | 1631 | /* Avoid direct_complete to let wakeup_path propagate. */ |
4e1d9a73 | 1632 | if (device_may_wakeup(dev) || device_wakeup_path(dev)) |
dc351d4c UH |
1633 | dev->power.direct_complete = false; |
1634 | ||
aae4518b RW |
1635 | if (dev->power.direct_complete) { |
1636 | if (pm_runtime_status_suspended(dev)) { | |
1637 | pm_runtime_disable(dev); | |
4a0fa9f9 RW |
1638 | if (pm_runtime_status_suspended(dev)) { |
1639 | pm_dev_dbg(dev, state, "direct-complete "); | |
aae4518b | 1640 | goto Complete; |
4a0fa9f9 | 1641 | } |
aae4518b RW |
1642 | |
1643 | pm_runtime_enable(dev); | |
1644 | } | |
1645 | dev->power.direct_complete = false; | |
1646 | } | |
1647 | ||
0fe8a1be | 1648 | dev->power.may_skip_resume = true; |
4a9344cd | 1649 | dev->power.must_resume = !dev_pm_test_driver_flags(dev, DPM_FLAG_MAY_SKIP_RESUME); |
0d4b54c6 | 1650 | |
70fea60d | 1651 | dpm_watchdog_set(&wd, dev); |
1e2ef05b RW |
1652 | device_lock(dev); |
1653 | ||
564b905a | 1654 | if (dev->pm_domain) { |
9cf519d1 RW |
1655 | info = "power domain "; |
1656 | callback = pm_op(&dev->pm_domain->ops, state); | |
1657 | goto Run; | |
4d27e9dc RW |
1658 | } |
1659 | ||
9659cc06 | 1660 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
1661 | info = "type "; |
1662 | callback = pm_op(dev->type->pm, state); | |
1663 | goto Run; | |
9659cc06 RW |
1664 | } |
1665 | ||
a380f2ed RW |
1666 | if (dev->class && dev->class->pm) { |
1667 | info = "class "; | |
1668 | callback = pm_op(dev->class->pm, state); | |
1669 | goto Run; | |
cd59abfc AS |
1670 | } |
1671 | ||
1eede070 RW |
1672 | if (dev->bus) { |
1673 | if (dev->bus->pm) { | |
35cd133c | 1674 | info = "bus "; |
9cf519d1 | 1675 | callback = pm_op(dev->bus->pm, state); |
1eede070 | 1676 | } else if (dev->bus->suspend) { |
35cd133c | 1677 | pm_dev_dbg(dev, state, "legacy bus "); |
53644677 SK |
1678 | error = legacy_suspend(dev, state, dev->bus->suspend, |
1679 | "legacy bus "); | |
9cf519d1 | 1680 | goto End; |
1eede070 | 1681 | } |
7538e3db RW |
1682 | } |
1683 | ||
9cf519d1 | 1684 | Run: |
35cd133c RW |
1685 | if (!callback && dev->driver && dev->driver->pm) { |
1686 | info = "driver "; | |
1687 | callback = pm_op(dev->driver->pm, state); | |
1688 | } | |
1689 | ||
9cf519d1 RW |
1690 | error = dpm_run_callback(callback, dev, state, info); |
1691 | ||
1eede070 | 1692 | End: |
4ca46ff3 RW |
1693 | if (!error) { |
1694 | dev->power.is_suspended = true; | |
8512220c UH |
1695 | if (device_may_wakeup(dev)) |
1696 | dev->power.wakeup_path = true; | |
1697 | ||
c23bd387 UH |
1698 | dpm_propagate_wakeup_to_parent(dev); |
1699 | dpm_clear_superiors_direct_complete(dev); | |
4ca46ff3 | 1700 | } |
6d0e0e84 | 1701 | |
8e9394ce | 1702 | device_unlock(dev); |
70fea60d | 1703 | dpm_watchdog_clear(&wd); |
1f758b23 MSB |
1704 | |
1705 | Complete: | |
ac6f87aa | 1706 | if (error) { |
098dff73 | 1707 | async_error = error; |
ac6f87aa RW |
1708 | dpm_save_failed_dev(dev_name(dev)); |
1709 | pm_dev_err(dev, state, async ? " async" : "", error); | |
1710 | } | |
098dff73 | 1711 | |
05a92622 | 1712 | complete_all(&dev->power.completion); |
431d452a | 1713 | TRACE_SUSPEND(error); |
cd59abfc AS |
1714 | return error; |
1715 | } | |
1716 | ||
5af84b82 RW |
1717 | static void async_suspend(void *data, async_cookie_t cookie) |
1718 | { | |
73d73f5e | 1719 | struct device *dev = data; |
5af84b82 | 1720 | |
ac6f87aa | 1721 | __device_suspend(dev, pm_transition, true); |
5af84b82 RW |
1722 | put_device(dev); |
1723 | } | |
1724 | ||
1725 | static int device_suspend(struct device *dev) | |
1726 | { | |
f2a424f6 | 1727 | if (dpm_async_fn(dev, async_suspend)) |
5af84b82 | 1728 | return 0; |
5af84b82 RW |
1729 | |
1730 | return __device_suspend(dev, pm_transition, false); | |
1731 | } | |
1732 | ||
cd59abfc | 1733 | /** |
20d652d7 RW |
1734 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
1735 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1736 | */ |
91e7c75b | 1737 | int dpm_suspend(pm_message_t state) |
cd59abfc | 1738 | { |
ecf762b2 | 1739 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
1740 | int error = 0; |
1741 | ||
bb3632c6 | 1742 | trace_suspend_resume(TPS("dpm_suspend"), state.event, true); |
91e7c75b RW |
1743 | might_sleep(); |
1744 | ||
6e863844 | 1745 | devfreq_suspend(); |
2f0aea93 VK |
1746 | cpufreq_suspend(); |
1747 | ||
cd59abfc | 1748 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
1749 | pm_transition = state; |
1750 | async_error = 0; | |
8a43a9ab RW |
1751 | while (!list_empty(&dpm_prepared_list)) { |
1752 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 1753 | |
1eede070 | 1754 | get_device(dev); |
2aa36604 | 1755 | |
cd59abfc | 1756 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 1757 | |
5af84b82 | 1758 | error = device_suspend(dev); |
1eede070 | 1759 | |
1b3cbec1 | 1760 | mutex_lock(&dpm_list_mtx); |
2aa36604 | 1761 | |
ac6f87aa | 1762 | if (!error && !list_empty(&dev->power.entry)) |
8a43a9ab | 1763 | list_move(&dev->power.entry, &dpm_suspended_list); |
2aa36604 RW |
1764 | |
1765 | mutex_unlock(&dpm_list_mtx); | |
1766 | ||
1eede070 | 1767 | put_device(dev); |
2aa36604 RW |
1768 | |
1769 | mutex_lock(&dpm_list_mtx); | |
1770 | ||
1771 | if (error || async_error) | |
5af84b82 | 1772 | break; |
cd59abfc AS |
1773 | } |
1774 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
1775 | async_synchronize_full(); |
1776 | if (!error) | |
1777 | error = async_error; | |
b730bab0 RW |
1778 | |
1779 | if (error) | |
2a77c46d | 1780 | dpm_save_failed_step(SUSPEND_SUSPEND); |
b730bab0 | 1781 | |
48059c09 | 1782 | dpm_show_time(starttime, state, error, NULL); |
bb3632c6 | 1783 | trace_suspend_resume(TPS("dpm_suspend"), state.event, false); |
1eede070 RW |
1784 | return error; |
1785 | } | |
1786 | ||
1787 | /** | |
20d652d7 RW |
1788 | * device_prepare - Prepare a device for system power transition. |
1789 | * @dev: Device to handle. | |
1790 | * @state: PM transition of the system being carried out. | |
1791 | * | |
1792 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
1793 | * device may be registered after this function has returned. | |
1eede070 | 1794 | */ |
d1616302 | 1795 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 | 1796 | { |
35cd133c | 1797 | int (*callback)(struct device *) = NULL; |
aae4518b | 1798 | int ret = 0; |
1eede070 | 1799 | |
88d26136 AS |
1800 | /* |
1801 | * If a device's parent goes into runtime suspend at the wrong time, | |
1802 | * it won't be possible to resume the device. To prevent this we | |
1803 | * block runtime suspend here, during the prepare phase, and allow | |
1804 | * it again during the complete phase. | |
1805 | */ | |
1806 | pm_runtime_get_noresume(dev); | |
1807 | ||
928265e3 RW |
1808 | if (dev->power.syscore) |
1809 | return 0; | |
1810 | ||
8e9394ce | 1811 | device_lock(dev); |
1eede070 | 1812 | |
8512220c | 1813 | dev->power.wakeup_path = false; |
4ca46ff3 | 1814 | |
c62ec461 | 1815 | if (dev->power.no_pm_callbacks) |
aa8e54b5 | 1816 | goto unlock; |
aa8e54b5 | 1817 | |
fba1fbf5 | 1818 | if (dev->pm_domain) |
35cd133c | 1819 | callback = dev->pm_domain->ops.prepare; |
fba1fbf5 | 1820 | else if (dev->type && dev->type->pm) |
35cd133c | 1821 | callback = dev->type->pm->prepare; |
fba1fbf5 | 1822 | else if (dev->class && dev->class->pm) |
35cd133c | 1823 | callback = dev->class->pm->prepare; |
fba1fbf5 | 1824 | else if (dev->bus && dev->bus->pm) |
35cd133c | 1825 | callback = dev->bus->pm->prepare; |
35cd133c | 1826 | |
fba1fbf5 | 1827 | if (!callback && dev->driver && dev->driver->pm) |
35cd133c | 1828 | callback = dev->driver->pm->prepare; |
35cd133c | 1829 | |
32e8d689 | 1830 | if (callback) |
aae4518b | 1831 | ret = callback(dev); |
7538e3db | 1832 | |
aa8e54b5 | 1833 | unlock: |
8e9394ce | 1834 | device_unlock(dev); |
1eede070 | 1835 | |
aae4518b | 1836 | if (ret < 0) { |
a759de69 | 1837 | suspend_report_result(dev, callback, ret); |
aa1b9f13 | 1838 | pm_runtime_put(dev); |
aae4518b RW |
1839 | return ret; |
1840 | } | |
1841 | /* | |
1842 | * A positive return value from ->prepare() means "this device appears | |
1843 | * to be runtime-suspended and its state is fine, so if it really is | |
1844 | * runtime-suspended, you can leave it in that state provided that you | |
1845 | * will do the same thing with all of its descendants". This only | |
1846 | * applies to suspend transitions, however. | |
1847 | */ | |
1848 | spin_lock_irq(&dev->power.lock); | |
08810a41 | 1849 | dev->power.direct_complete = state.event == PM_EVENT_SUSPEND && |
b5252a6c | 1850 | (ret > 0 || dev->power.no_pm_callbacks) && |
e0751556 | 1851 | !dev_pm_test_driver_flags(dev, DPM_FLAG_NO_DIRECT_COMPLETE); |
aae4518b RW |
1852 | spin_unlock_irq(&dev->power.lock); |
1853 | return 0; | |
1eede070 | 1854 | } |
cd59abfc | 1855 | |
1eede070 | 1856 | /** |
20d652d7 RW |
1857 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1858 | * @state: PM transition of the system being carried out. | |
1eede070 | 1859 | * |
20d652d7 | 1860 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 | 1861 | */ |
91e7c75b | 1862 | int dpm_prepare(pm_message_t state) |
1eede070 | 1863 | { |
1eede070 RW |
1864 | int error = 0; |
1865 | ||
bb3632c6 | 1866 | trace_suspend_resume(TPS("dpm_prepare"), state.event, true); |
91e7c75b RW |
1867 | might_sleep(); |
1868 | ||
013c074f SG |
1869 | /* |
1870 | * Give a chance for the known devices to complete their probes, before | |
1871 | * disable probing of devices. This sync point is important at least | |
1872 | * at boot time + hibernation restore. | |
1873 | */ | |
1874 | wait_for_device_probe(); | |
1875 | /* | |
1876 | * It is unsafe if probing of devices will happen during suspend or | |
1877 | * hibernation and system behavior will be unpredictable in this case. | |
1878 | * So, let's prohibit device's probing here and defer their probes | |
1879 | * instead. The normal behavior will be restored in dpm_complete(). | |
1880 | */ | |
1881 | device_block_probing(); | |
1882 | ||
1eede070 | 1883 | mutex_lock(&dpm_list_mtx); |
544e737d | 1884 | while (!list_empty(&dpm_list) && !error) { |
1eede070 RW |
1885 | struct device *dev = to_device(dpm_list.next); |
1886 | ||
1887 | get_device(dev); | |
2aa36604 | 1888 | |
1eede070 RW |
1889 | mutex_unlock(&dpm_list_mtx); |
1890 | ||
32e8d689 | 1891 | trace_device_pm_callback_start(dev, "", state.event); |
1e2ef05b | 1892 | error = device_prepare(dev, state); |
32e8d689 | 1893 | trace_device_pm_callback_end(dev, error); |
1eede070 RW |
1894 | |
1895 | mutex_lock(&dpm_list_mtx); | |
2aa36604 RW |
1896 | |
1897 | if (!error) { | |
1898 | dev->power.is_prepared = true; | |
1899 | if (!list_empty(&dev->power.entry)) | |
1900 | list_move_tail(&dev->power.entry, &dpm_prepared_list); | |
1901 | } else if (error == -EAGAIN) { | |
1902 | error = 0; | |
1903 | } else { | |
eb23d91a BH |
1904 | dev_info(dev, "not prepared for power transition: code %d\n", |
1905 | error); | |
1eede070 | 1906 | } |
2aa36604 RW |
1907 | |
1908 | mutex_unlock(&dpm_list_mtx); | |
1909 | ||
1eede070 | 1910 | put_device(dev); |
2aa36604 RW |
1911 | |
1912 | mutex_lock(&dpm_list_mtx); | |
1eede070 | 1913 | } |
1eede070 | 1914 | mutex_unlock(&dpm_list_mtx); |
bb3632c6 | 1915 | trace_suspend_resume(TPS("dpm_prepare"), state.event, false); |
cd59abfc AS |
1916 | return error; |
1917 | } | |
1918 | ||
775b64d2 | 1919 | /** |
20d652d7 RW |
1920 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1921 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1922 | * |
20d652d7 RW |
1923 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1924 | * callbacks for them. | |
775b64d2 | 1925 | */ |
d1616302 | 1926 | int dpm_suspend_start(pm_message_t state) |
775b64d2 | 1927 | { |
3540d38d | 1928 | ktime_t starttime = ktime_get(); |
775b64d2 | 1929 | int error; |
cd59abfc | 1930 | |
1eede070 | 1931 | error = dpm_prepare(state); |
b730bab0 | 1932 | if (error) |
2a77c46d | 1933 | dpm_save_failed_step(SUSPEND_PREPARE); |
b730bab0 | 1934 | else |
1eede070 | 1935 | error = dpm_suspend(state); |
b730bab0 | 1936 | |
3540d38d | 1937 | dpm_show_time(starttime, state, error, "start"); |
cd59abfc | 1938 | return error; |
cd59abfc | 1939 | } |
d1616302 | 1940 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc | 1941 | |
a759de69 | 1942 | void __suspend_report_result(const char *function, struct device *dev, void *fn, int ret) |
cd59abfc | 1943 | { |
c80cfb04 | 1944 | if (ret) |
a759de69 | 1945 | dev_err(dev, "%s(): %pS returns %d\n", function, fn, ret); |
cd59abfc AS |
1946 | } |
1947 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1948 | |
1949 | /** | |
1950 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
f8824cee | 1951 | * @subordinate: Device that needs to wait for @dev. |
0b237cb2 | 1952 | * @dev: Device to wait for. |
f8824cee | 1953 | */ |
098dff73 | 1954 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1955 | { |
1956 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1957 | return async_error; |
f8824cee RW |
1958 | } |
1959 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); | |
dfe3212e ML |
1960 | |
1961 | /** | |
1962 | * dpm_for_each_dev - device iterator. | |
1963 | * @data: data for the callback. | |
1964 | * @fn: function to be called for each device. | |
1965 | * | |
1966 | * Iterate over devices in dpm_list, and call @fn for each device, | |
1967 | * passing it @data. | |
1968 | */ | |
1969 | void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) | |
1970 | { | |
1971 | struct device *dev; | |
1972 | ||
1973 | if (!fn) | |
1974 | return; | |
1975 | ||
1976 | device_pm_lock(); | |
1977 | list_for_each_entry(dev, &dpm_list, power.entry) | |
1978 | fn(dev, data); | |
1979 | device_pm_unlock(); | |
1980 | } | |
1981 | EXPORT_SYMBOL_GPL(dpm_for_each_dev); | |
aa8e54b5 TV |
1982 | |
1983 | static bool pm_ops_is_empty(const struct dev_pm_ops *ops) | |
1984 | { | |
1985 | if (!ops) | |
1986 | return true; | |
1987 | ||
1988 | return !ops->prepare && | |
1989 | !ops->suspend && | |
1990 | !ops->suspend_late && | |
1991 | !ops->suspend_noirq && | |
1992 | !ops->resume_noirq && | |
1993 | !ops->resume_early && | |
1994 | !ops->resume && | |
1995 | !ops->complete; | |
1996 | } | |
1997 | ||
1998 | void device_pm_check_callbacks(struct device *dev) | |
1999 | { | |
524bb1da DB |
2000 | unsigned long flags; |
2001 | ||
2002 | spin_lock_irqsave(&dev->power.lock, flags); | |
aa8e54b5 | 2003 | dev->power.no_pm_callbacks = |
157c460e RW |
2004 | (!dev->bus || (pm_ops_is_empty(dev->bus->pm) && |
2005 | !dev->bus->suspend && !dev->bus->resume)) && | |
a380f2ed | 2006 | (!dev->class || pm_ops_is_empty(dev->class->pm)) && |
aa8e54b5 TV |
2007 | (!dev->type || pm_ops_is_empty(dev->type->pm)) && |
2008 | (!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) && | |
157c460e RW |
2009 | (!dev->driver || (pm_ops_is_empty(dev->driver->pm) && |
2010 | !dev->driver->suspend && !dev->driver->resume)); | |
524bb1da | 2011 | spin_unlock_irqrestore(&dev->power.lock, flags); |
aa8e54b5 | 2012 | } |
c4b65157 | 2013 | |
fa2bfead | 2014 | bool dev_pm_skip_suspend(struct device *dev) |
c4b65157 RW |
2015 | { |
2016 | return dev_pm_test_driver_flags(dev, DPM_FLAG_SMART_SUSPEND) && | |
2017 | pm_runtime_status_suspended(dev); | |
2018 | } |