Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * drivers/base/power/main.c - Where the driver meets power management. | |
3 | * | |
4 | * Copyright (c) 2003 Patrick Mochel | |
5 | * Copyright (c) 2003 Open Source Development Lab | |
6 | * | |
7 | * This file is released under the GPLv2 | |
8 | * | |
9 | * | |
10 | * The driver model core calls device_pm_add() when a device is registered. | |
b595076a | 11 | * This will initialize the embedded device_pm_info object in the device |
1da177e4 LT |
12 | * and add it to the list of power-controlled devices. sysfs entries for |
13 | * controlling device power management will also be added. | |
14 | * | |
1eede070 RW |
15 | * A separate list is used for keeping track of power info, because the power |
16 | * domain dependencies may differ from the ancestral dependencies that the | |
17 | * subsystem list maintains. | |
1da177e4 LT |
18 | */ |
19 | ||
1da177e4 | 20 | #include <linux/device.h> |
cd59abfc | 21 | #include <linux/kallsyms.h> |
1b6bc32f | 22 | #include <linux/export.h> |
11048dcf | 23 | #include <linux/mutex.h> |
cd59abfc | 24 | #include <linux/pm.h> |
5e928f77 | 25 | #include <linux/pm_runtime.h> |
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> |
8651f97b | 35 | #include <linux/cpuidle.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 | ||
775b64d2 | 43 | /* |
1eede070 | 44 | * The entries in the dpm_list list are in a depth first order, simply |
775b64d2 RW |
45 | * because children are guaranteed to be discovered after parents, and |
46 | * are inserted at the back of the list on discovery. | |
47 | * | |
8e9394ce GKH |
48 | * Since device_pm_add() may be called with a device lock held, |
49 | * we must never try to acquire a device lock while holding | |
775b64d2 RW |
50 | * dpm_list_mutex. |
51 | */ | |
52 | ||
1eede070 | 53 | LIST_HEAD(dpm_list); |
7664e969 SK |
54 | static LIST_HEAD(dpm_prepared_list); |
55 | static LIST_HEAD(dpm_suspended_list); | |
56 | static LIST_HEAD(dpm_late_early_list); | |
57 | static LIST_HEAD(dpm_noirq_list); | |
1da177e4 | 58 | |
2a77c46d | 59 | struct suspend_stats suspend_stats; |
cd59abfc | 60 | static DEFINE_MUTEX(dpm_list_mtx); |
5af84b82 | 61 | static pm_message_t pm_transition; |
1da177e4 | 62 | |
098dff73 RW |
63 | static int async_error; |
64 | ||
952856db | 65 | static const char *pm_verb(int event) |
53644677 SK |
66 | { |
67 | switch (event) { | |
68 | case PM_EVENT_SUSPEND: | |
69 | return "suspend"; | |
70 | case PM_EVENT_RESUME: | |
71 | return "resume"; | |
72 | case PM_EVENT_FREEZE: | |
73 | return "freeze"; | |
74 | case PM_EVENT_QUIESCE: | |
75 | return "quiesce"; | |
76 | case PM_EVENT_HIBERNATE: | |
77 | return "hibernate"; | |
78 | case PM_EVENT_THAW: | |
79 | return "thaw"; | |
80 | case PM_EVENT_RESTORE: | |
81 | return "restore"; | |
82 | case PM_EVENT_RECOVER: | |
83 | return "recover"; | |
84 | default: | |
85 | return "(unknown PM event)"; | |
86 | } | |
87 | } | |
88 | ||
5e928f77 | 89 | /** |
e91c11b1 | 90 | * device_pm_sleep_init - Initialize system suspend-related device fields. |
5e928f77 RW |
91 | * @dev: Device object being initialized. |
92 | */ | |
e91c11b1 | 93 | void device_pm_sleep_init(struct device *dev) |
5e928f77 | 94 | { |
f76b168b | 95 | dev->power.is_prepared = false; |
6d0e0e84 | 96 | dev->power.is_suspended = false; |
3d2699bc LC |
97 | dev->power.is_noirq_suspended = false; |
98 | dev->power.is_late_suspended = false; | |
5af84b82 | 99 | init_completion(&dev->power.completion); |
152e1d59 | 100 | complete_all(&dev->power.completion); |
074037ec | 101 | dev->power.wakeup = NULL; |
22110faf | 102 | INIT_LIST_HEAD(&dev->power.entry); |
5e928f77 RW |
103 | } |
104 | ||
1eede070 | 105 | /** |
20d652d7 | 106 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
107 | */ |
108 | void device_pm_lock(void) | |
109 | { | |
110 | mutex_lock(&dpm_list_mtx); | |
111 | } | |
112 | ||
113 | /** | |
20d652d7 | 114 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
115 | */ |
116 | void device_pm_unlock(void) | |
117 | { | |
118 | mutex_unlock(&dpm_list_mtx); | |
119 | } | |
075c1771 | 120 | |
775b64d2 | 121 | /** |
20d652d7 RW |
122 | * device_pm_add - Add a device to the PM core's list of active devices. |
123 | * @dev: Device to add to the list. | |
775b64d2 | 124 | */ |
3b98aeaf | 125 | void device_pm_add(struct device *dev) |
1da177e4 | 126 | { |
1da177e4 | 127 | pr_debug("PM: Adding info for %s:%s\n", |
5c1a07ab | 128 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
aa8e54b5 | 129 | device_pm_check_callbacks(dev); |
11048dcf | 130 | mutex_lock(&dpm_list_mtx); |
f76b168b | 131 | if (dev->parent && dev->parent->power.is_prepared) |
b64959e6 RW |
132 | dev_warn(dev, "parent %s should not be sleeping\n", |
133 | dev_name(dev->parent)); | |
3b98aeaf | 134 | list_add_tail(&dev->power.entry, &dpm_list); |
9ed98953 | 135 | dev->power.in_dpm_list = true; |
1a9a9152 | 136 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
137 | } |
138 | ||
775b64d2 | 139 | /** |
20d652d7 RW |
140 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
141 | * @dev: Device to be removed from the list. | |
775b64d2 | 142 | */ |
9cddad77 | 143 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
144 | { |
145 | pr_debug("PM: Removing info for %s:%s\n", | |
5c1a07ab | 146 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
5af84b82 | 147 | complete_all(&dev->power.completion); |
11048dcf | 148 | mutex_lock(&dpm_list_mtx); |
1da177e4 | 149 | list_del_init(&dev->power.entry); |
9ed98953 | 150 | dev->power.in_dpm_list = false; |
11048dcf | 151 | mutex_unlock(&dpm_list_mtx); |
074037ec | 152 | device_wakeup_disable(dev); |
5e928f77 | 153 | pm_runtime_remove(dev); |
aa8e54b5 | 154 | device_pm_check_callbacks(dev); |
775b64d2 RW |
155 | } |
156 | ||
ffa6a705 | 157 | /** |
20d652d7 RW |
158 | * device_pm_move_before - Move device in the PM core's list of active devices. |
159 | * @deva: Device to move in dpm_list. | |
160 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
161 | */ |
162 | void device_pm_move_before(struct device *deva, struct device *devb) | |
163 | { | |
164 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
5c1a07ab RW |
165 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
166 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
167 | /* Delete deva from dpm_list and reinsert before devb. */ |
168 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
169 | } | |
170 | ||
171 | /** | |
20d652d7 RW |
172 | * device_pm_move_after - Move device in the PM core's list of active devices. |
173 | * @deva: Device to move in dpm_list. | |
174 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
175 | */ |
176 | void device_pm_move_after(struct device *deva, struct device *devb) | |
177 | { | |
178 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
5c1a07ab RW |
179 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
180 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
181 | /* Delete deva from dpm_list and reinsert after devb. */ |
182 | list_move(&deva->power.entry, &devb->power.entry); | |
183 | } | |
184 | ||
185 | /** | |
20d652d7 RW |
186 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
187 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
188 | */ |
189 | void device_pm_move_last(struct device *dev) | |
190 | { | |
191 | pr_debug("PM: Moving %s:%s to end of list\n", | |
5c1a07ab | 192 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
ffa6a705 CH |
193 | list_move_tail(&dev->power.entry, &dpm_list); |
194 | } | |
195 | ||
875ab0b7 RW |
196 | static ktime_t initcall_debug_start(struct device *dev) |
197 | { | |
8b0e1953 | 198 | ktime_t calltime = 0; |
875ab0b7 | 199 | |
b2df1d4f | 200 | if (pm_print_times_enabled) { |
0c6aebe3 RW |
201 | pr_info("calling %s+ @ %i, parent: %s\n", |
202 | dev_name(dev), task_pid_nr(current), | |
203 | dev->parent ? dev_name(dev->parent) : "none"); | |
875ab0b7 RW |
204 | calltime = ktime_get(); |
205 | } | |
206 | ||
207 | return calltime; | |
208 | } | |
209 | ||
210 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
e3771fa9 KK |
211 | int error, pm_message_t state, |
212 | const char *info) | |
875ab0b7 | 213 | { |
53644677 SK |
214 | ktime_t rettime; |
215 | s64 nsecs; | |
216 | ||
217 | rettime = ktime_get(); | |
218 | nsecs = (s64) ktime_to_ns(ktime_sub(rettime, calltime)); | |
875ab0b7 | 219 | |
b2df1d4f | 220 | if (pm_print_times_enabled) { |
875ab0b7 | 221 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), |
53644677 | 222 | error, (unsigned long long)nsecs >> 10); |
875ab0b7 RW |
223 | } |
224 | } | |
225 | ||
5af84b82 RW |
226 | /** |
227 | * dpm_wait - Wait for a PM operation to complete. | |
228 | * @dev: Device to wait for. | |
229 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
230 | */ | |
231 | static void dpm_wait(struct device *dev, bool async) | |
232 | { | |
233 | if (!dev) | |
234 | return; | |
235 | ||
0e06b4a8 | 236 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
237 | wait_for_completion(&dev->power.completion); |
238 | } | |
239 | ||
240 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
241 | { | |
242 | dpm_wait(dev, *((bool *)async_ptr)); | |
243 | return 0; | |
244 | } | |
245 | ||
246 | static void dpm_wait_for_children(struct device *dev, bool async) | |
247 | { | |
248 | device_for_each_child(dev, &async, dpm_wait_fn); | |
249 | } | |
250 | ||
8c73b428 RW |
251 | static void dpm_wait_for_suppliers(struct device *dev, bool async) |
252 | { | |
253 | struct device_link *link; | |
254 | int idx; | |
255 | ||
256 | idx = device_links_read_lock(); | |
257 | ||
258 | /* | |
259 | * If the supplier goes away right after we've checked the link to it, | |
260 | * we'll wait for its completion to change the state, but that's fine, | |
261 | * because the only things that will block as a result are the SRCU | |
262 | * callbacks freeing the link objects for the links in the list we're | |
263 | * walking. | |
264 | */ | |
265 | list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) | |
266 | if (READ_ONCE(link->status) != DL_STATE_DORMANT) | |
267 | dpm_wait(link->supplier, async); | |
268 | ||
269 | device_links_read_unlock(idx); | |
270 | } | |
271 | ||
272 | static void dpm_wait_for_superior(struct device *dev, bool async) | |
273 | { | |
274 | dpm_wait(dev->parent, async); | |
275 | dpm_wait_for_suppliers(dev, async); | |
276 | } | |
277 | ||
278 | static void dpm_wait_for_consumers(struct device *dev, bool async) | |
279 | { | |
280 | struct device_link *link; | |
281 | int idx; | |
282 | ||
283 | idx = device_links_read_lock(); | |
284 | ||
285 | /* | |
286 | * The status of a device link can only be changed from "dormant" by a | |
287 | * probe, but that cannot happen during system suspend/resume. In | |
288 | * theory it can change to "dormant" at that time, but then it is | |
289 | * reasonable to wait for the target device anyway (eg. if it goes | |
290 | * away, it's better to wait for it to go away completely and then | |
291 | * continue instead of trying to continue in parallel with its | |
292 | * unregistration). | |
293 | */ | |
294 | list_for_each_entry_rcu(link, &dev->links.consumers, s_node) | |
295 | if (READ_ONCE(link->status) != DL_STATE_DORMANT) | |
296 | dpm_wait(link->consumer, async); | |
297 | ||
298 | device_links_read_unlock(idx); | |
299 | } | |
300 | ||
301 | static void dpm_wait_for_subordinate(struct device *dev, bool async) | |
302 | { | |
303 | dpm_wait_for_children(dev, async); | |
304 | dpm_wait_for_consumers(dev, async); | |
305 | } | |
306 | ||
1eede070 | 307 | /** |
9cf519d1 | 308 | * pm_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
309 | * @ops: PM operations to choose from. |
310 | * @state: PM transition of the system being carried out. | |
1eede070 | 311 | */ |
9cf519d1 | 312 | static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 313 | { |
1eede070 RW |
314 | switch (state.event) { |
315 | #ifdef CONFIG_SUSPEND | |
316 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 317 | return ops->suspend; |
1eede070 | 318 | case PM_EVENT_RESUME: |
9cf519d1 | 319 | return ops->resume; |
1eede070 | 320 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 321 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
322 | case PM_EVENT_FREEZE: |
323 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 324 | return ops->freeze; |
1eede070 | 325 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 326 | return ops->poweroff; |
1eede070 RW |
327 | case PM_EVENT_THAW: |
328 | case PM_EVENT_RECOVER: | |
9cf519d1 | 329 | return ops->thaw; |
1eede070 RW |
330 | break; |
331 | case PM_EVENT_RESTORE: | |
9cf519d1 | 332 | return ops->restore; |
1f112cee | 333 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 334 | } |
f2511774 | 335 | |
9cf519d1 | 336 | return NULL; |
1eede070 RW |
337 | } |
338 | ||
cf579dfb RW |
339 | /** |
340 | * pm_late_early_op - Return the PM operation appropriate for given PM event. | |
341 | * @ops: PM operations to choose from. | |
342 | * @state: PM transition of the system being carried out. | |
343 | * | |
344 | * Runtime PM is disabled for @dev while this function is being executed. | |
345 | */ | |
346 | static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops, | |
347 | pm_message_t state) | |
348 | { | |
349 | switch (state.event) { | |
350 | #ifdef CONFIG_SUSPEND | |
351 | case PM_EVENT_SUSPEND: | |
352 | return ops->suspend_late; | |
353 | case PM_EVENT_RESUME: | |
354 | return ops->resume_early; | |
355 | #endif /* CONFIG_SUSPEND */ | |
356 | #ifdef CONFIG_HIBERNATE_CALLBACKS | |
357 | case PM_EVENT_FREEZE: | |
358 | case PM_EVENT_QUIESCE: | |
359 | return ops->freeze_late; | |
360 | case PM_EVENT_HIBERNATE: | |
361 | return ops->poweroff_late; | |
362 | case PM_EVENT_THAW: | |
363 | case PM_EVENT_RECOVER: | |
364 | return ops->thaw_early; | |
365 | case PM_EVENT_RESTORE: | |
366 | return ops->restore_early; | |
367 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ | |
368 | } | |
369 | ||
370 | return NULL; | |
371 | } | |
372 | ||
1eede070 | 373 | /** |
9cf519d1 | 374 | * pm_noirq_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
375 | * @ops: PM operations to choose from. |
376 | * @state: PM transition of the system being carried out. | |
1eede070 | 377 | * |
20d652d7 RW |
378 | * The driver of @dev will not receive interrupts while this function is being |
379 | * executed. | |
1eede070 | 380 | */ |
9cf519d1 | 381 | static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 382 | { |
1eede070 RW |
383 | switch (state.event) { |
384 | #ifdef CONFIG_SUSPEND | |
385 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 386 | return ops->suspend_noirq; |
1eede070 | 387 | case PM_EVENT_RESUME: |
9cf519d1 | 388 | return ops->resume_noirq; |
1eede070 | 389 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 390 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
391 | case PM_EVENT_FREEZE: |
392 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 393 | return ops->freeze_noirq; |
1eede070 | 394 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 395 | return ops->poweroff_noirq; |
1eede070 RW |
396 | case PM_EVENT_THAW: |
397 | case PM_EVENT_RECOVER: | |
9cf519d1 | 398 | return ops->thaw_noirq; |
1eede070 | 399 | case PM_EVENT_RESTORE: |
9cf519d1 | 400 | return ops->restore_noirq; |
1f112cee | 401 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 402 | } |
f2511774 | 403 | |
9cf519d1 | 404 | return NULL; |
1eede070 RW |
405 | } |
406 | ||
e3771fa9 | 407 | static void pm_dev_dbg(struct device *dev, pm_message_t state, const char *info) |
1eede070 RW |
408 | { |
409 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
410 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
411 | ", may wakeup" : ""); | |
412 | } | |
413 | ||
e3771fa9 | 414 | static void pm_dev_err(struct device *dev, pm_message_t state, const char *info, |
1eede070 RW |
415 | int error) |
416 | { | |
417 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
5c1a07ab | 418 | dev_name(dev), pm_verb(state.event), info, error); |
1eede070 RW |
419 | } |
420 | ||
604d8958 | 421 | #ifdef CONFIG_PM_DEBUG |
e3771fa9 KK |
422 | static void dpm_show_time(ktime_t starttime, pm_message_t state, |
423 | const char *info) | |
ecf762b2 RW |
424 | { |
425 | ktime_t calltime; | |
0702d9ee | 426 | u64 usecs64; |
ecf762b2 RW |
427 | int usecs; |
428 | ||
429 | calltime = ktime_get(); | |
430 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
431 | do_div(usecs64, NSEC_PER_USEC); | |
432 | usecs = usecs64; | |
433 | if (usecs == 0) | |
434 | usecs = 1; | |
435 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
436 | info ?: "", info ? " " : "", pm_verb(state.event), | |
437 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
438 | } | |
604d8958 | 439 | #else |
8f8e5c3e RW |
440 | static inline void dpm_show_time(ktime_t starttime, pm_message_t state, |
441 | const char *info) {} | |
604d8958 | 442 | #endif /* CONFIG_PM_DEBUG */ |
ecf762b2 | 443 | |
9cf519d1 | 444 | static int dpm_run_callback(pm_callback_t cb, struct device *dev, |
e3771fa9 | 445 | pm_message_t state, const char *info) |
9cf519d1 RW |
446 | { |
447 | ktime_t calltime; | |
448 | int error; | |
449 | ||
450 | if (!cb) | |
451 | return 0; | |
452 | ||
453 | calltime = initcall_debug_start(dev); | |
454 | ||
455 | pm_dev_dbg(dev, state, info); | |
e8bca479 | 456 | trace_device_pm_callback_start(dev, info, state.event); |
9cf519d1 | 457 | error = cb(dev); |
e8bca479 | 458 | trace_device_pm_callback_end(dev, error); |
9cf519d1 RW |
459 | suspend_report_result(cb, error); |
460 | ||
53644677 | 461 | initcall_debug_report(dev, calltime, error, state, info); |
9cf519d1 RW |
462 | |
463 | return error; | |
464 | } | |
465 | ||
70fea60d BG |
466 | #ifdef CONFIG_DPM_WATCHDOG |
467 | struct dpm_watchdog { | |
468 | struct device *dev; | |
469 | struct task_struct *tsk; | |
470 | struct timer_list timer; | |
471 | }; | |
472 | ||
473 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \ | |
474 | struct dpm_watchdog wd | |
475 | ||
476 | /** | |
477 | * dpm_watchdog_handler - Driver suspend / resume watchdog handler. | |
478 | * @data: Watchdog object address. | |
479 | * | |
480 | * Called when a driver has timed out suspending or resuming. | |
481 | * There's not much we can do here to recover so panic() to | |
482 | * capture a crash-dump in pstore. | |
483 | */ | |
484 | static void dpm_watchdog_handler(unsigned long data) | |
485 | { | |
486 | struct dpm_watchdog *wd = (void *)data; | |
487 | ||
488 | dev_emerg(wd->dev, "**** DPM device timeout ****\n"); | |
489 | show_stack(wd->tsk, NULL); | |
490 | panic("%s %s: unrecoverable failure\n", | |
491 | dev_driver_string(wd->dev), dev_name(wd->dev)); | |
492 | } | |
493 | ||
494 | /** | |
495 | * dpm_watchdog_set - Enable pm watchdog for given device. | |
496 | * @wd: Watchdog. Must be allocated on the stack. | |
497 | * @dev: Device to handle. | |
498 | */ | |
499 | static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev) | |
500 | { | |
501 | struct timer_list *timer = &wd->timer; | |
502 | ||
503 | wd->dev = dev; | |
504 | wd->tsk = current; | |
505 | ||
506 | init_timer_on_stack(timer); | |
507 | /* use same timeout value for both suspend and resume */ | |
508 | timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT; | |
509 | timer->function = dpm_watchdog_handler; | |
510 | timer->data = (unsigned long)wd; | |
511 | add_timer(timer); | |
512 | } | |
513 | ||
514 | /** | |
515 | * dpm_watchdog_clear - Disable suspend/resume watchdog. | |
516 | * @wd: Watchdog to disable. | |
517 | */ | |
518 | static void dpm_watchdog_clear(struct dpm_watchdog *wd) | |
519 | { | |
520 | struct timer_list *timer = &wd->timer; | |
521 | ||
522 | del_timer_sync(timer); | |
523 | destroy_timer_on_stack(timer); | |
524 | } | |
525 | #else | |
526 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) | |
527 | #define dpm_watchdog_set(x, y) | |
528 | #define dpm_watchdog_clear(x) | |
529 | #endif | |
530 | ||
cd59abfc AS |
531 | /*------------------------- Resume routines -------------------------*/ |
532 | ||
533 | /** | |
20d652d7 RW |
534 | * device_resume_noirq - Execute an "early resume" callback for given device. |
535 | * @dev: Device to handle. | |
536 | * @state: PM transition of the system being carried out. | |
58c256a3 | 537 | * @async: If true, the device is being resumed asynchronously. |
cd59abfc | 538 | * |
20d652d7 RW |
539 | * The driver of @dev will not receive interrupts while this function is being |
540 | * executed. | |
cd59abfc | 541 | */ |
76569faa | 542 | static int device_resume_noirq(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 543 | { |
9cf519d1 | 544 | pm_callback_t callback = NULL; |
e3771fa9 | 545 | const char *info = NULL; |
cd59abfc AS |
546 | int error = 0; |
547 | ||
548 | TRACE_DEVICE(dev); | |
549 | TRACE_RESUME(0); | |
550 | ||
aae4518b | 551 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
552 | goto Out; |
553 | ||
3d2699bc LC |
554 | if (!dev->power.is_noirq_suspended) |
555 | goto Out; | |
556 | ||
8c73b428 | 557 | dpm_wait_for_superior(dev, async); |
76569faa | 558 | |
564b905a | 559 | if (dev->pm_domain) { |
cf579dfb | 560 | info = "noirq power domain "; |
9cf519d1 | 561 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 562 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 563 | info = "noirq type "; |
9cf519d1 | 564 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 565 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 566 | info = "noirq class "; |
9cf519d1 | 567 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 568 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 569 | info = "noirq bus "; |
9cf519d1 | 570 | callback = pm_noirq_op(dev->bus->pm, state); |
e7176a37 DB |
571 | } |
572 | ||
35cd133c | 573 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 574 | info = "noirq driver "; |
35cd133c RW |
575 | callback = pm_noirq_op(dev->driver->pm, state); |
576 | } | |
577 | ||
9cf519d1 | 578 | error = dpm_run_callback(callback, dev, state, info); |
3d2699bc | 579 | dev->power.is_noirq_suspended = false; |
9cf519d1 | 580 | |
dbf37414 | 581 | Out: |
76569faa | 582 | complete_all(&dev->power.completion); |
775b64d2 RW |
583 | TRACE_RESUME(error); |
584 | return error; | |
585 | } | |
586 | ||
76569faa LC |
587 | static bool is_async(struct device *dev) |
588 | { | |
589 | return dev->power.async_suspend && pm_async_enabled | |
590 | && !pm_trace_is_enabled(); | |
591 | } | |
592 | ||
593 | static void async_resume_noirq(void *data, async_cookie_t cookie) | |
594 | { | |
595 | struct device *dev = (struct device *)data; | |
596 | int error; | |
597 | ||
598 | error = device_resume_noirq(dev, pm_transition, true); | |
599 | if (error) | |
600 | pm_dev_err(dev, pm_transition, " async", error); | |
601 | ||
602 | put_device(dev); | |
603 | } | |
604 | ||
775b64d2 | 605 | /** |
cf579dfb | 606 | * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices. |
20d652d7 | 607 | * @state: PM transition of the system being carried out. |
775b64d2 | 608 | * |
cf579dfb | 609 | * Call the "noirq" resume handlers for all devices in dpm_noirq_list and |
20d652d7 | 610 | * enable device drivers to receive interrupts. |
775b64d2 | 611 | */ |
2a8a8ce6 | 612 | void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 613 | { |
76569faa | 614 | struct device *dev; |
ecf762b2 | 615 | ktime_t starttime = ktime_get(); |
775b64d2 | 616 | |
bb3632c6 | 617 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, true); |
32bdfac5 | 618 | mutex_lock(&dpm_list_mtx); |
76569faa | 619 | pm_transition = state; |
d08a5ace | 620 | |
76569faa LC |
621 | /* |
622 | * Advanced the async threads upfront, | |
623 | * in case the starting of async threads is | |
624 | * delayed by non-async resuming devices. | |
625 | */ | |
626 | list_for_each_entry(dev, &dpm_noirq_list, power.entry) { | |
627 | reinit_completion(&dev->power.completion); | |
628 | if (is_async(dev)) { | |
629 | get_device(dev); | |
630 | async_schedule(async_resume_noirq, dev); | |
631 | } | |
632 | } | |
633 | ||
634 | while (!list_empty(&dpm_noirq_list)) { | |
635 | dev = to_device(dpm_noirq_list.next); | |
d08a5ace | 636 | get_device(dev); |
cf579dfb | 637 | list_move_tail(&dev->power.entry, &dpm_late_early_list); |
5b219a51 | 638 | mutex_unlock(&dpm_list_mtx); |
d08a5ace | 639 | |
76569faa LC |
640 | if (!is_async(dev)) { |
641 | int error; | |
642 | ||
643 | error = device_resume_noirq(dev, state, false); | |
644 | if (error) { | |
645 | suspend_stats.failed_resume_noirq++; | |
646 | dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); | |
647 | dpm_save_failed_dev(dev_name(dev)); | |
648 | pm_dev_err(dev, state, " noirq", error); | |
649 | } | |
cf579dfb RW |
650 | } |
651 | ||
652 | mutex_lock(&dpm_list_mtx); | |
653 | put_device(dev); | |
654 | } | |
655 | mutex_unlock(&dpm_list_mtx); | |
76569faa | 656 | async_synchronize_full(); |
cf579dfb RW |
657 | dpm_show_time(starttime, state, "noirq"); |
658 | resume_device_irqs(); | |
4990d4fe | 659 | device_wakeup_disarm_wake_irqs(); |
8651f97b | 660 | cpuidle_resume(); |
bb3632c6 | 661 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false); |
cf579dfb RW |
662 | } |
663 | ||
664 | /** | |
665 | * device_resume_early - Execute an "early resume" callback for given device. | |
666 | * @dev: Device to handle. | |
667 | * @state: PM transition of the system being carried out. | |
58c256a3 | 668 | * @async: If true, the device is being resumed asynchronously. |
cf579dfb RW |
669 | * |
670 | * Runtime PM is disabled for @dev while this function is being executed. | |
671 | */ | |
9e5e7910 | 672 | static int device_resume_early(struct device *dev, pm_message_t state, bool async) |
cf579dfb RW |
673 | { |
674 | pm_callback_t callback = NULL; | |
e3771fa9 | 675 | const char *info = NULL; |
cf579dfb RW |
676 | int error = 0; |
677 | ||
678 | TRACE_DEVICE(dev); | |
679 | TRACE_RESUME(0); | |
680 | ||
aae4518b | 681 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
682 | goto Out; |
683 | ||
3d2699bc LC |
684 | if (!dev->power.is_late_suspended) |
685 | goto Out; | |
686 | ||
8c73b428 | 687 | dpm_wait_for_superior(dev, async); |
9e5e7910 | 688 | |
cf579dfb RW |
689 | if (dev->pm_domain) { |
690 | info = "early power domain "; | |
691 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
692 | } else if (dev->type && dev->type->pm) { | |
693 | info = "early type "; | |
694 | callback = pm_late_early_op(dev->type->pm, state); | |
695 | } else if (dev->class && dev->class->pm) { | |
696 | info = "early class "; | |
697 | callback = pm_late_early_op(dev->class->pm, state); | |
698 | } else if (dev->bus && dev->bus->pm) { | |
699 | info = "early bus "; | |
700 | callback = pm_late_early_op(dev->bus->pm, state); | |
701 | } | |
702 | ||
703 | if (!callback && dev->driver && dev->driver->pm) { | |
704 | info = "early driver "; | |
705 | callback = pm_late_early_op(dev->driver->pm, state); | |
706 | } | |
707 | ||
708 | error = dpm_run_callback(callback, dev, state, info); | |
3d2699bc | 709 | dev->power.is_late_suspended = false; |
cf579dfb | 710 | |
dbf37414 | 711 | Out: |
cf579dfb | 712 | TRACE_RESUME(error); |
9f6d8f6a RW |
713 | |
714 | pm_runtime_enable(dev); | |
9e5e7910 | 715 | complete_all(&dev->power.completion); |
cf579dfb RW |
716 | return error; |
717 | } | |
718 | ||
9e5e7910 LC |
719 | static void async_resume_early(void *data, async_cookie_t cookie) |
720 | { | |
721 | struct device *dev = (struct device *)data; | |
722 | int error; | |
723 | ||
724 | error = device_resume_early(dev, pm_transition, true); | |
725 | if (error) | |
726 | pm_dev_err(dev, pm_transition, " async", error); | |
727 | ||
728 | put_device(dev); | |
729 | } | |
730 | ||
cf579dfb RW |
731 | /** |
732 | * dpm_resume_early - Execute "early resume" callbacks for all devices. | |
733 | * @state: PM transition of the system being carried out. | |
734 | */ | |
2a8a8ce6 | 735 | void dpm_resume_early(pm_message_t state) |
cf579dfb | 736 | { |
9e5e7910 | 737 | struct device *dev; |
cf579dfb RW |
738 | ktime_t starttime = ktime_get(); |
739 | ||
bb3632c6 | 740 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, true); |
cf579dfb | 741 | mutex_lock(&dpm_list_mtx); |
9e5e7910 LC |
742 | pm_transition = state; |
743 | ||
744 | /* | |
745 | * Advanced the async threads upfront, | |
746 | * in case the starting of async threads is | |
747 | * delayed by non-async resuming devices. | |
748 | */ | |
749 | list_for_each_entry(dev, &dpm_late_early_list, power.entry) { | |
750 | reinit_completion(&dev->power.completion); | |
751 | if (is_async(dev)) { | |
752 | get_device(dev); | |
753 | async_schedule(async_resume_early, dev); | |
754 | } | |
755 | } | |
cf579dfb | 756 | |
9e5e7910 LC |
757 | while (!list_empty(&dpm_late_early_list)) { |
758 | dev = to_device(dpm_late_early_list.next); | |
cf579dfb RW |
759 | get_device(dev); |
760 | list_move_tail(&dev->power.entry, &dpm_suspended_list); | |
761 | mutex_unlock(&dpm_list_mtx); | |
762 | ||
9e5e7910 LC |
763 | if (!is_async(dev)) { |
764 | int error; | |
d08a5ace | 765 | |
9e5e7910 LC |
766 | error = device_resume_early(dev, state, false); |
767 | if (error) { | |
768 | suspend_stats.failed_resume_early++; | |
769 | dpm_save_failed_step(SUSPEND_RESUME_EARLY); | |
770 | dpm_save_failed_dev(dev_name(dev)); | |
771 | pm_dev_err(dev, state, " early", error); | |
772 | } | |
773 | } | |
5b219a51 | 774 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
775 | put_device(dev); |
776 | } | |
32bdfac5 | 777 | mutex_unlock(&dpm_list_mtx); |
9e5e7910 | 778 | async_synchronize_full(); |
ecf762b2 | 779 | dpm_show_time(starttime, state, "early"); |
bb3632c6 | 780 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, false); |
775b64d2 | 781 | } |
cf579dfb RW |
782 | |
783 | /** | |
784 | * dpm_resume_start - Execute "noirq" and "early" device callbacks. | |
785 | * @state: PM transition of the system being carried out. | |
786 | */ | |
787 | void dpm_resume_start(pm_message_t state) | |
788 | { | |
789 | dpm_resume_noirq(state); | |
790 | dpm_resume_early(state); | |
791 | } | |
792 | EXPORT_SYMBOL_GPL(dpm_resume_start); | |
775b64d2 RW |
793 | |
794 | /** | |
97df8c12 | 795 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
796 | * @dev: Device to handle. |
797 | * @state: PM transition of the system being carried out. | |
5af84b82 | 798 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 799 | */ |
97df8c12 | 800 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 801 | { |
9cf519d1 | 802 | pm_callback_t callback = NULL; |
e3771fa9 | 803 | const char *info = NULL; |
775b64d2 | 804 | int error = 0; |
70fea60d | 805 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
775b64d2 RW |
806 | |
807 | TRACE_DEVICE(dev); | |
808 | TRACE_RESUME(0); | |
cd59abfc | 809 | |
dbf37414 RW |
810 | if (dev->power.syscore) |
811 | goto Complete; | |
812 | ||
aae4518b RW |
813 | if (dev->power.direct_complete) { |
814 | /* Match the pm_runtime_disable() in __device_suspend(). */ | |
815 | pm_runtime_enable(dev); | |
816 | goto Complete; | |
817 | } | |
818 | ||
8c73b428 | 819 | dpm_wait_for_superior(dev, async); |
70fea60d | 820 | dpm_watchdog_set(&wd, dev); |
8e9394ce | 821 | device_lock(dev); |
7a8d37a3 | 822 | |
f76b168b AS |
823 | /* |
824 | * This is a fib. But we'll allow new children to be added below | |
825 | * a resumed device, even if the device hasn't been completed yet. | |
826 | */ | |
827 | dev->power.is_prepared = false; | |
97df8c12 | 828 | |
6d0e0e84 AS |
829 | if (!dev->power.is_suspended) |
830 | goto Unlock; | |
831 | ||
564b905a | 832 | if (dev->pm_domain) { |
9cf519d1 RW |
833 | info = "power domain "; |
834 | callback = pm_op(&dev->pm_domain->ops, state); | |
35cd133c | 835 | goto Driver; |
7538e3db RW |
836 | } |
837 | ||
9659cc06 | 838 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
839 | info = "type "; |
840 | callback = pm_op(dev->type->pm, state); | |
35cd133c | 841 | goto Driver; |
cd59abfc AS |
842 | } |
843 | ||
1eede070 RW |
844 | if (dev->class) { |
845 | if (dev->class->pm) { | |
9cf519d1 RW |
846 | info = "class "; |
847 | callback = pm_op(dev->class->pm, state); | |
35cd133c | 848 | goto Driver; |
1eede070 | 849 | } else if (dev->class->resume) { |
9cf519d1 RW |
850 | info = "legacy class "; |
851 | callback = dev->class->resume; | |
9659cc06 | 852 | goto End; |
1eede070 | 853 | } |
cd59abfc | 854 | } |
9659cc06 RW |
855 | |
856 | if (dev->bus) { | |
857 | if (dev->bus->pm) { | |
35cd133c | 858 | info = "bus "; |
9cf519d1 | 859 | callback = pm_op(dev->bus->pm, state); |
9659cc06 | 860 | } else if (dev->bus->resume) { |
35cd133c | 861 | info = "legacy bus "; |
9cf519d1 | 862 | callback = dev->bus->resume; |
35cd133c | 863 | goto End; |
9659cc06 RW |
864 | } |
865 | } | |
866 | ||
35cd133c RW |
867 | Driver: |
868 | if (!callback && dev->driver && dev->driver->pm) { | |
869 | info = "driver "; | |
870 | callback = pm_op(dev->driver->pm, state); | |
871 | } | |
872 | ||
1eede070 | 873 | End: |
9cf519d1 | 874 | error = dpm_run_callback(callback, dev, state, info); |
6d0e0e84 AS |
875 | dev->power.is_suspended = false; |
876 | ||
877 | Unlock: | |
8e9394ce | 878 | device_unlock(dev); |
70fea60d | 879 | dpm_watchdog_clear(&wd); |
dbf37414 RW |
880 | |
881 | Complete: | |
5af84b82 | 882 | complete_all(&dev->power.completion); |
7a8d37a3 | 883 | |
cd59abfc | 884 | TRACE_RESUME(error); |
1e2ef05b | 885 | |
cd59abfc AS |
886 | return error; |
887 | } | |
888 | ||
5af84b82 RW |
889 | static void async_resume(void *data, async_cookie_t cookie) |
890 | { | |
891 | struct device *dev = (struct device *)data; | |
892 | int error; | |
893 | ||
97df8c12 | 894 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
895 | if (error) |
896 | pm_dev_err(dev, pm_transition, " async", error); | |
897 | put_device(dev); | |
898 | } | |
899 | ||
775b64d2 | 900 | /** |
20d652d7 RW |
901 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
902 | * @state: PM transition of the system being carried out. | |
775b64d2 | 903 | * |
20d652d7 RW |
904 | * Execute the appropriate "resume" callback for all devices whose status |
905 | * indicates that they are suspended. | |
1eede070 | 906 | */ |
91e7c75b | 907 | void dpm_resume(pm_message_t state) |
1eede070 | 908 | { |
97df8c12 | 909 | struct device *dev; |
ecf762b2 | 910 | ktime_t starttime = ktime_get(); |
1eede070 | 911 | |
bb3632c6 | 912 | trace_suspend_resume(TPS("dpm_resume"), state.event, true); |
91e7c75b RW |
913 | might_sleep(); |
914 | ||
1eede070 | 915 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 916 | pm_transition = state; |
098dff73 | 917 | async_error = 0; |
1eede070 | 918 | |
8a43a9ab | 919 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
16735d02 | 920 | reinit_completion(&dev->power.completion); |
97df8c12 RW |
921 | if (is_async(dev)) { |
922 | get_device(dev); | |
923 | async_schedule(async_resume, dev); | |
924 | } | |
925 | } | |
926 | ||
8a43a9ab RW |
927 | while (!list_empty(&dpm_suspended_list)) { |
928 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 929 | get_device(dev); |
5b219a51 | 930 | if (!is_async(dev)) { |
1eede070 RW |
931 | int error; |
932 | ||
1eede070 RW |
933 | mutex_unlock(&dpm_list_mtx); |
934 | ||
97df8c12 | 935 | error = device_resume(dev, state, false); |
2a77c46d SL |
936 | if (error) { |
937 | suspend_stats.failed_resume++; | |
938 | dpm_save_failed_step(SUSPEND_RESUME); | |
939 | dpm_save_failed_dev(dev_name(dev)); | |
1eede070 | 940 | pm_dev_err(dev, state, "", error); |
2a77c46d | 941 | } |
5b219a51 RW |
942 | |
943 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
944 | } |
945 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 946 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
947 | put_device(dev); |
948 | } | |
1eede070 | 949 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 950 | async_synchronize_full(); |
ecf762b2 | 951 | dpm_show_time(starttime, state, NULL); |
2f0aea93 VK |
952 | |
953 | cpufreq_resume(); | |
bb3632c6 | 954 | trace_suspend_resume(TPS("dpm_resume"), state.event, false); |
1eede070 RW |
955 | } |
956 | ||
957 | /** | |
20d652d7 RW |
958 | * device_complete - Complete a PM transition for given device. |
959 | * @dev: Device to handle. | |
960 | * @state: PM transition of the system being carried out. | |
1eede070 | 961 | */ |
d1616302 | 962 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 963 | { |
35cd133c | 964 | void (*callback)(struct device *) = NULL; |
e3771fa9 | 965 | const char *info = NULL; |
35cd133c | 966 | |
dbf37414 RW |
967 | if (dev->power.syscore) |
968 | return; | |
969 | ||
8e9394ce | 970 | device_lock(dev); |
1eede070 | 971 | |
564b905a | 972 | if (dev->pm_domain) { |
35cd133c RW |
973 | info = "completing power domain "; |
974 | callback = dev->pm_domain->ops.complete; | |
4d27e9dc | 975 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
976 | info = "completing type "; |
977 | callback = dev->type->pm->complete; | |
9659cc06 | 978 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
979 | info = "completing class "; |
980 | callback = dev->class->pm->complete; | |
9659cc06 | 981 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
982 | info = "completing bus "; |
983 | callback = dev->bus->pm->complete; | |
984 | } | |
985 | ||
986 | if (!callback && dev->driver && dev->driver->pm) { | |
987 | info = "completing driver "; | |
988 | callback = dev->driver->pm->complete; | |
989 | } | |
990 | ||
991 | if (callback) { | |
992 | pm_dev_dbg(dev, state, info); | |
993 | callback(dev); | |
1eede070 RW |
994 | } |
995 | ||
8e9394ce | 996 | device_unlock(dev); |
88d26136 | 997 | |
af939339 | 998 | pm_runtime_put(dev); |
1eede070 RW |
999 | } |
1000 | ||
1001 | /** | |
20d652d7 RW |
1002 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
1003 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1004 | * |
20d652d7 RW |
1005 | * Execute the ->complete() callbacks for all devices whose PM status is not |
1006 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 1007 | */ |
91e7c75b | 1008 | void dpm_complete(pm_message_t state) |
cd59abfc | 1009 | { |
1eede070 RW |
1010 | struct list_head list; |
1011 | ||
bb3632c6 | 1012 | trace_suspend_resume(TPS("dpm_complete"), state.event, true); |
91e7c75b RW |
1013 | might_sleep(); |
1014 | ||
1eede070 | 1015 | INIT_LIST_HEAD(&list); |
cd59abfc | 1016 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
1017 | while (!list_empty(&dpm_prepared_list)) { |
1018 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 1019 | |
1eede070 | 1020 | get_device(dev); |
f76b168b | 1021 | dev->power.is_prepared = false; |
5b219a51 RW |
1022 | list_move(&dev->power.entry, &list); |
1023 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 1024 | |
32e8d689 | 1025 | trace_device_pm_callback_start(dev, "", state.event); |
5b219a51 | 1026 | device_complete(dev, state); |
32e8d689 | 1027 | trace_device_pm_callback_end(dev, 0); |
1eede070 | 1028 | |
5b219a51 | 1029 | mutex_lock(&dpm_list_mtx); |
1eede070 | 1030 | put_device(dev); |
cd59abfc | 1031 | } |
1eede070 | 1032 | list_splice(&list, &dpm_list); |
cd59abfc | 1033 | mutex_unlock(&dpm_list_mtx); |
013c074f SG |
1034 | |
1035 | /* Allow device probing and trigger re-probing of deferred devices */ | |
1036 | device_unblock_probing(); | |
bb3632c6 | 1037 | trace_suspend_resume(TPS("dpm_complete"), state.event, false); |
cd59abfc AS |
1038 | } |
1039 | ||
cd59abfc | 1040 | /** |
20d652d7 RW |
1041 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
1042 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1043 | * |
20d652d7 RW |
1044 | * Execute "resume" callbacks for all devices and complete the PM transition of |
1045 | * the system. | |
cd59abfc | 1046 | */ |
d1616302 | 1047 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 1048 | { |
1eede070 RW |
1049 | dpm_resume(state); |
1050 | dpm_complete(state); | |
cd59abfc | 1051 | } |
d1616302 | 1052 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
1053 | |
1054 | ||
1055 | /*------------------------- Suspend routines -------------------------*/ | |
1056 | ||
1eede070 | 1057 | /** |
20d652d7 RW |
1058 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
1059 | * @sleep_state: PM message representing a sleep state. | |
1060 | * | |
1061 | * Return a PM message representing the resume event corresponding to given | |
1062 | * sleep state. | |
1eede070 RW |
1063 | */ |
1064 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 1065 | { |
1eede070 RW |
1066 | switch (sleep_state.event) { |
1067 | case PM_EVENT_SUSPEND: | |
1068 | return PMSG_RESUME; | |
1069 | case PM_EVENT_FREEZE: | |
1070 | case PM_EVENT_QUIESCE: | |
1071 | return PMSG_RECOVER; | |
1072 | case PM_EVENT_HIBERNATE: | |
1073 | return PMSG_RESTORE; | |
cd59abfc | 1074 | } |
1eede070 | 1075 | return PMSG_ON; |
cd59abfc AS |
1076 | } |
1077 | ||
1078 | /** | |
20d652d7 RW |
1079 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
1080 | * @dev: Device to handle. | |
1081 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1082 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1083 | * |
20d652d7 RW |
1084 | * The driver of @dev will not receive interrupts while this function is being |
1085 | * executed. | |
cd59abfc | 1086 | */ |
28b6fd6e | 1087 | static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 1088 | { |
9cf519d1 | 1089 | pm_callback_t callback = NULL; |
e3771fa9 | 1090 | const char *info = NULL; |
28b6fd6e LC |
1091 | int error = 0; |
1092 | ||
431d452a ZF |
1093 | TRACE_DEVICE(dev); |
1094 | TRACE_SUSPEND(0); | |
1095 | ||
098c3055 | 1096 | dpm_wait_for_subordinate(dev, async); |
6f75c3fd | 1097 | |
28b6fd6e LC |
1098 | if (async_error) |
1099 | goto Complete; | |
1100 | ||
aae4518b | 1101 | if (dev->power.syscore || dev->power.direct_complete) |
28b6fd6e LC |
1102 | goto Complete; |
1103 | ||
564b905a | 1104 | if (dev->pm_domain) { |
cf579dfb | 1105 | info = "noirq power domain "; |
9cf519d1 | 1106 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 1107 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 1108 | info = "noirq type "; |
9cf519d1 | 1109 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 1110 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 1111 | info = "noirq class "; |
9cf519d1 | 1112 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 1113 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 1114 | info = "noirq bus "; |
9cf519d1 | 1115 | callback = pm_noirq_op(dev->bus->pm, state); |
7538e3db RW |
1116 | } |
1117 | ||
35cd133c | 1118 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 1119 | info = "noirq driver "; |
35cd133c RW |
1120 | callback = pm_noirq_op(dev->driver->pm, state); |
1121 | } | |
1122 | ||
3d2699bc LC |
1123 | error = dpm_run_callback(callback, dev, state, info); |
1124 | if (!error) | |
1125 | dev->power.is_noirq_suspended = true; | |
28b6fd6e LC |
1126 | else |
1127 | async_error = error; | |
3d2699bc | 1128 | |
28b6fd6e LC |
1129 | Complete: |
1130 | complete_all(&dev->power.completion); | |
431d452a | 1131 | TRACE_SUSPEND(error); |
3d2699bc | 1132 | return error; |
775b64d2 RW |
1133 | } |
1134 | ||
28b6fd6e LC |
1135 | static void async_suspend_noirq(void *data, async_cookie_t cookie) |
1136 | { | |
1137 | struct device *dev = (struct device *)data; | |
1138 | int error; | |
1139 | ||
1140 | error = __device_suspend_noirq(dev, pm_transition, true); | |
1141 | if (error) { | |
1142 | dpm_save_failed_dev(dev_name(dev)); | |
1143 | pm_dev_err(dev, pm_transition, " async", error); | |
1144 | } | |
1145 | ||
1146 | put_device(dev); | |
1147 | } | |
1148 | ||
1149 | static int device_suspend_noirq(struct device *dev) | |
1150 | { | |
1151 | reinit_completion(&dev->power.completion); | |
1152 | ||
431d452a | 1153 | if (is_async(dev)) { |
28b6fd6e LC |
1154 | get_device(dev); |
1155 | async_schedule(async_suspend_noirq, dev); | |
1156 | return 0; | |
1157 | } | |
1158 | return __device_suspend_noirq(dev, pm_transition, false); | |
1159 | } | |
1160 | ||
775b64d2 | 1161 | /** |
cf579dfb | 1162 | * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices. |
20d652d7 | 1163 | * @state: PM transition of the system being carried out. |
775b64d2 | 1164 | * |
20d652d7 RW |
1165 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
1166 | * handlers for all non-sysdev devices. | |
775b64d2 | 1167 | */ |
2a8a8ce6 | 1168 | int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 1169 | { |
ecf762b2 | 1170 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
1171 | int error = 0; |
1172 | ||
bb3632c6 | 1173 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true); |
8651f97b | 1174 | cpuidle_pause(); |
4990d4fe | 1175 | device_wakeup_arm_wake_irqs(); |
2ed8d2b3 | 1176 | suspend_device_irqs(); |
32bdfac5 | 1177 | mutex_lock(&dpm_list_mtx); |
28b6fd6e LC |
1178 | pm_transition = state; |
1179 | async_error = 0; | |
1180 | ||
cf579dfb RW |
1181 | while (!list_empty(&dpm_late_early_list)) { |
1182 | struct device *dev = to_device(dpm_late_early_list.prev); | |
d08a5ace RW |
1183 | |
1184 | get_device(dev); | |
1185 | mutex_unlock(&dpm_list_mtx); | |
1186 | ||
28b6fd6e | 1187 | error = device_suspend_noirq(dev); |
d08a5ace RW |
1188 | |
1189 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 1190 | if (error) { |
cf579dfb | 1191 | pm_dev_err(dev, state, " noirq", error); |
2a77c46d | 1192 | dpm_save_failed_dev(dev_name(dev)); |
d08a5ace | 1193 | put_device(dev); |
775b64d2 RW |
1194 | break; |
1195 | } | |
d08a5ace | 1196 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1197 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 1198 | put_device(dev); |
52d136cc | 1199 | |
28b6fd6e | 1200 | if (async_error) |
52d136cc | 1201 | break; |
775b64d2 | 1202 | } |
32bdfac5 | 1203 | mutex_unlock(&dpm_list_mtx); |
28b6fd6e LC |
1204 | async_synchronize_full(); |
1205 | if (!error) | |
1206 | error = async_error; | |
1207 | ||
1208 | if (error) { | |
1209 | suspend_stats.failed_suspend_noirq++; | |
1210 | dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); | |
d1616302 | 1211 | dpm_resume_noirq(resume_event(state)); |
28b6fd6e | 1212 | } else { |
cf579dfb | 1213 | dpm_show_time(starttime, state, "noirq"); |
28b6fd6e | 1214 | } |
bb3632c6 | 1215 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false); |
cf579dfb RW |
1216 | return error; |
1217 | } | |
1218 | ||
1219 | /** | |
1220 | * device_suspend_late - Execute a "late suspend" callback for given device. | |
1221 | * @dev: Device to handle. | |
1222 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1223 | * @async: If true, the device is being suspended asynchronously. |
cf579dfb RW |
1224 | * |
1225 | * Runtime PM is disabled for @dev while this function is being executed. | |
1226 | */ | |
de377b39 | 1227 | static int __device_suspend_late(struct device *dev, pm_message_t state, bool async) |
cf579dfb RW |
1228 | { |
1229 | pm_callback_t callback = NULL; | |
e3771fa9 | 1230 | const char *info = NULL; |
de377b39 | 1231 | int error = 0; |
cf579dfb | 1232 | |
431d452a ZF |
1233 | TRACE_DEVICE(dev); |
1234 | TRACE_SUSPEND(0); | |
1235 | ||
9f6d8f6a RW |
1236 | __pm_runtime_disable(dev, false); |
1237 | ||
098c3055 | 1238 | dpm_wait_for_subordinate(dev, async); |
6f75c3fd | 1239 | |
de377b39 LC |
1240 | if (async_error) |
1241 | goto Complete; | |
1242 | ||
1243 | if (pm_wakeup_pending()) { | |
1244 | async_error = -EBUSY; | |
1245 | goto Complete; | |
1246 | } | |
1247 | ||
aae4518b | 1248 | if (dev->power.syscore || dev->power.direct_complete) |
de377b39 LC |
1249 | goto Complete; |
1250 | ||
cf579dfb RW |
1251 | if (dev->pm_domain) { |
1252 | info = "late power domain "; | |
1253 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
1254 | } else if (dev->type && dev->type->pm) { | |
1255 | info = "late type "; | |
1256 | callback = pm_late_early_op(dev->type->pm, state); | |
1257 | } else if (dev->class && dev->class->pm) { | |
1258 | info = "late class "; | |
1259 | callback = pm_late_early_op(dev->class->pm, state); | |
1260 | } else if (dev->bus && dev->bus->pm) { | |
1261 | info = "late bus "; | |
1262 | callback = pm_late_early_op(dev->bus->pm, state); | |
1263 | } | |
1264 | ||
1265 | if (!callback && dev->driver && dev->driver->pm) { | |
1266 | info = "late driver "; | |
1267 | callback = pm_late_early_op(dev->driver->pm, state); | |
1268 | } | |
1269 | ||
3d2699bc LC |
1270 | error = dpm_run_callback(callback, dev, state, info); |
1271 | if (!error) | |
1272 | dev->power.is_late_suspended = true; | |
de377b39 LC |
1273 | else |
1274 | async_error = error; | |
3d2699bc | 1275 | |
de377b39 | 1276 | Complete: |
431d452a | 1277 | TRACE_SUSPEND(error); |
de377b39 | 1278 | complete_all(&dev->power.completion); |
3d2699bc | 1279 | return error; |
cf579dfb RW |
1280 | } |
1281 | ||
de377b39 LC |
1282 | static void async_suspend_late(void *data, async_cookie_t cookie) |
1283 | { | |
1284 | struct device *dev = (struct device *)data; | |
1285 | int error; | |
1286 | ||
1287 | error = __device_suspend_late(dev, pm_transition, true); | |
1288 | if (error) { | |
1289 | dpm_save_failed_dev(dev_name(dev)); | |
1290 | pm_dev_err(dev, pm_transition, " async", error); | |
1291 | } | |
1292 | put_device(dev); | |
1293 | } | |
1294 | ||
1295 | static int device_suspend_late(struct device *dev) | |
1296 | { | |
1297 | reinit_completion(&dev->power.completion); | |
1298 | ||
431d452a | 1299 | if (is_async(dev)) { |
de377b39 LC |
1300 | get_device(dev); |
1301 | async_schedule(async_suspend_late, dev); | |
1302 | return 0; | |
1303 | } | |
1304 | ||
1305 | return __device_suspend_late(dev, pm_transition, false); | |
1306 | } | |
1307 | ||
cf579dfb RW |
1308 | /** |
1309 | * dpm_suspend_late - Execute "late suspend" callbacks for all devices. | |
1310 | * @state: PM transition of the system being carried out. | |
1311 | */ | |
2a8a8ce6 | 1312 | int dpm_suspend_late(pm_message_t state) |
cf579dfb RW |
1313 | { |
1314 | ktime_t starttime = ktime_get(); | |
1315 | int error = 0; | |
1316 | ||
bb3632c6 | 1317 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, true); |
cf579dfb | 1318 | mutex_lock(&dpm_list_mtx); |
de377b39 LC |
1319 | pm_transition = state; |
1320 | async_error = 0; | |
1321 | ||
cf579dfb RW |
1322 | while (!list_empty(&dpm_suspended_list)) { |
1323 | struct device *dev = to_device(dpm_suspended_list.prev); | |
1324 | ||
1325 | get_device(dev); | |
1326 | mutex_unlock(&dpm_list_mtx); | |
1327 | ||
de377b39 | 1328 | error = device_suspend_late(dev); |
cf579dfb RW |
1329 | |
1330 | mutex_lock(&dpm_list_mtx); | |
3a17fb32 RW |
1331 | if (!list_empty(&dev->power.entry)) |
1332 | list_move(&dev->power.entry, &dpm_late_early_list); | |
1333 | ||
cf579dfb RW |
1334 | if (error) { |
1335 | pm_dev_err(dev, state, " late", error); | |
cf579dfb RW |
1336 | dpm_save_failed_dev(dev_name(dev)); |
1337 | put_device(dev); | |
1338 | break; | |
1339 | } | |
cf579dfb | 1340 | put_device(dev); |
52d136cc | 1341 | |
de377b39 | 1342 | if (async_error) |
52d136cc | 1343 | break; |
cf579dfb RW |
1344 | } |
1345 | mutex_unlock(&dpm_list_mtx); | |
de377b39 | 1346 | async_synchronize_full(); |
246ef766 ID |
1347 | if (!error) |
1348 | error = async_error; | |
de377b39 LC |
1349 | if (error) { |
1350 | suspend_stats.failed_suspend_late++; | |
1351 | dpm_save_failed_step(SUSPEND_SUSPEND_LATE); | |
cf579dfb | 1352 | dpm_resume_early(resume_event(state)); |
de377b39 | 1353 | } else { |
ecf762b2 | 1354 | dpm_show_time(starttime, state, "late"); |
de377b39 | 1355 | } |
bb3632c6 | 1356 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false); |
775b64d2 RW |
1357 | return error; |
1358 | } | |
cf579dfb RW |
1359 | |
1360 | /** | |
1361 | * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks. | |
1362 | * @state: PM transition of the system being carried out. | |
1363 | */ | |
1364 | int dpm_suspend_end(pm_message_t state) | |
1365 | { | |
1366 | int error = dpm_suspend_late(state); | |
064b021f CC |
1367 | if (error) |
1368 | return error; | |
1369 | ||
1370 | error = dpm_suspend_noirq(state); | |
1371 | if (error) { | |
997a0311 | 1372 | dpm_resume_early(resume_event(state)); |
064b021f CC |
1373 | return error; |
1374 | } | |
cf579dfb | 1375 | |
064b021f | 1376 | return 0; |
cf579dfb RW |
1377 | } |
1378 | EXPORT_SYMBOL_GPL(dpm_suspend_end); | |
775b64d2 | 1379 | |
875ab0b7 RW |
1380 | /** |
1381 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
1382 | * @dev: Device to suspend. |
1383 | * @state: PM transition of the system being carried out. | |
1384 | * @cb: Suspend callback to execute. | |
58c256a3 | 1385 | * @info: string description of caller. |
875ab0b7 RW |
1386 | */ |
1387 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
53644677 | 1388 | int (*cb)(struct device *dev, pm_message_t state), |
e3771fa9 | 1389 | const char *info) |
875ab0b7 RW |
1390 | { |
1391 | int error; | |
1392 | ktime_t calltime; | |
1393 | ||
1394 | calltime = initcall_debug_start(dev); | |
1395 | ||
e8bca479 | 1396 | trace_device_pm_callback_start(dev, info, state.event); |
875ab0b7 | 1397 | error = cb(dev, state); |
e8bca479 | 1398 | trace_device_pm_callback_end(dev, error); |
875ab0b7 RW |
1399 | suspend_report_result(cb, error); |
1400 | ||
53644677 | 1401 | initcall_debug_report(dev, calltime, error, state, info); |
875ab0b7 RW |
1402 | |
1403 | return error; | |
1404 | } | |
1405 | ||
8c73b428 RW |
1406 | static void dpm_clear_suppliers_direct_complete(struct device *dev) |
1407 | { | |
1408 | struct device_link *link; | |
1409 | int idx; | |
1410 | ||
1411 | idx = device_links_read_lock(); | |
1412 | ||
1413 | list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) { | |
1414 | spin_lock_irq(&link->supplier->power.lock); | |
1415 | link->supplier->power.direct_complete = false; | |
1416 | spin_unlock_irq(&link->supplier->power.lock); | |
1417 | } | |
1418 | ||
1419 | device_links_read_unlock(idx); | |
1420 | } | |
1421 | ||
775b64d2 | 1422 | /** |
20d652d7 RW |
1423 | * device_suspend - Execute "suspend" callbacks for given device. |
1424 | * @dev: Device to handle. | |
1425 | * @state: PM transition of the system being carried out. | |
5af84b82 | 1426 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1427 | */ |
5af84b82 | 1428 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 1429 | { |
9cf519d1 | 1430 | pm_callback_t callback = NULL; |
e3771fa9 | 1431 | const char *info = NULL; |
cd59abfc | 1432 | int error = 0; |
70fea60d | 1433 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
cd59abfc | 1434 | |
431d452a ZF |
1435 | TRACE_DEVICE(dev); |
1436 | TRACE_SUSPEND(0); | |
1437 | ||
8c73b428 | 1438 | dpm_wait_for_subordinate(dev, async); |
7a8d37a3 | 1439 | |
5af84b82 | 1440 | if (async_error) |
1f758b23 | 1441 | goto Complete; |
1e2ef05b | 1442 | |
88d26136 AS |
1443 | /* |
1444 | * If a device configured to wake up the system from sleep states | |
1445 | * has been suspended at run time and there's a resume request pending | |
1446 | * for it, this is equivalent to the device signaling wakeup, so the | |
1447 | * system suspend operation should be aborted. | |
1448 | */ | |
1e2ef05b RW |
1449 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1450 | pm_wakeup_event(dev, 0); | |
5af84b82 | 1451 | |
d83f905e RW |
1452 | if (pm_wakeup_pending()) { |
1453 | async_error = -EBUSY; | |
1f758b23 | 1454 | goto Complete; |
d83f905e RW |
1455 | } |
1456 | ||
dbf37414 RW |
1457 | if (dev->power.syscore) |
1458 | goto Complete; | |
1459 | ||
aae4518b RW |
1460 | if (dev->power.direct_complete) { |
1461 | if (pm_runtime_status_suspended(dev)) { | |
1462 | pm_runtime_disable(dev); | |
019d8817 | 1463 | if (pm_runtime_status_suspended(dev)) |
aae4518b RW |
1464 | goto Complete; |
1465 | ||
1466 | pm_runtime_enable(dev); | |
1467 | } | |
1468 | dev->power.direct_complete = false; | |
1469 | } | |
1470 | ||
70fea60d | 1471 | dpm_watchdog_set(&wd, dev); |
1e2ef05b RW |
1472 | device_lock(dev); |
1473 | ||
564b905a | 1474 | if (dev->pm_domain) { |
9cf519d1 RW |
1475 | info = "power domain "; |
1476 | callback = pm_op(&dev->pm_domain->ops, state); | |
1477 | goto Run; | |
4d27e9dc RW |
1478 | } |
1479 | ||
9659cc06 | 1480 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
1481 | info = "type "; |
1482 | callback = pm_op(dev->type->pm, state); | |
1483 | goto Run; | |
9659cc06 RW |
1484 | } |
1485 | ||
1eede070 RW |
1486 | if (dev->class) { |
1487 | if (dev->class->pm) { | |
9cf519d1 RW |
1488 | info = "class "; |
1489 | callback = pm_op(dev->class->pm, state); | |
1490 | goto Run; | |
1eede070 RW |
1491 | } else if (dev->class->suspend) { |
1492 | pm_dev_dbg(dev, state, "legacy class "); | |
53644677 SK |
1493 | error = legacy_suspend(dev, state, dev->class->suspend, |
1494 | "legacy class "); | |
4d27e9dc | 1495 | goto End; |
1eede070 | 1496 | } |
cd59abfc AS |
1497 | } |
1498 | ||
1eede070 RW |
1499 | if (dev->bus) { |
1500 | if (dev->bus->pm) { | |
35cd133c | 1501 | info = "bus "; |
9cf519d1 | 1502 | callback = pm_op(dev->bus->pm, state); |
1eede070 | 1503 | } else if (dev->bus->suspend) { |
35cd133c | 1504 | pm_dev_dbg(dev, state, "legacy bus "); |
53644677 SK |
1505 | error = legacy_suspend(dev, state, dev->bus->suspend, |
1506 | "legacy bus "); | |
9cf519d1 | 1507 | goto End; |
1eede070 | 1508 | } |
7538e3db RW |
1509 | } |
1510 | ||
9cf519d1 | 1511 | Run: |
35cd133c RW |
1512 | if (!callback && dev->driver && dev->driver->pm) { |
1513 | info = "driver "; | |
1514 | callback = pm_op(dev->driver->pm, state); | |
1515 | } | |
1516 | ||
9cf519d1 RW |
1517 | error = dpm_run_callback(callback, dev, state, info); |
1518 | ||
1eede070 | 1519 | End: |
4ca46ff3 | 1520 | if (!error) { |
aae4518b RW |
1521 | struct device *parent = dev->parent; |
1522 | ||
4ca46ff3 | 1523 | dev->power.is_suspended = true; |
aae4518b RW |
1524 | if (parent) { |
1525 | spin_lock_irq(&parent->power.lock); | |
1526 | ||
1527 | dev->parent->power.direct_complete = false; | |
1528 | if (dev->power.wakeup_path | |
1529 | && !dev->parent->power.ignore_children) | |
1530 | dev->parent->power.wakeup_path = true; | |
1531 | ||
1532 | spin_unlock_irq(&parent->power.lock); | |
1533 | } | |
8c73b428 | 1534 | dpm_clear_suppliers_direct_complete(dev); |
4ca46ff3 | 1535 | } |
6d0e0e84 | 1536 | |
8e9394ce | 1537 | device_unlock(dev); |
70fea60d | 1538 | dpm_watchdog_clear(&wd); |
1f758b23 MSB |
1539 | |
1540 | Complete: | |
88d26136 | 1541 | if (error) |
098dff73 RW |
1542 | async_error = error; |
1543 | ||
05a92622 | 1544 | complete_all(&dev->power.completion); |
431d452a | 1545 | TRACE_SUSPEND(error); |
cd59abfc AS |
1546 | return error; |
1547 | } | |
1548 | ||
5af84b82 RW |
1549 | static void async_suspend(void *data, async_cookie_t cookie) |
1550 | { | |
1551 | struct device *dev = (struct device *)data; | |
1552 | int error; | |
1553 | ||
1554 | error = __device_suspend(dev, pm_transition, true); | |
2a77c46d SL |
1555 | if (error) { |
1556 | dpm_save_failed_dev(dev_name(dev)); | |
5af84b82 | 1557 | pm_dev_err(dev, pm_transition, " async", error); |
2a77c46d | 1558 | } |
5af84b82 RW |
1559 | |
1560 | put_device(dev); | |
1561 | } | |
1562 | ||
1563 | static int device_suspend(struct device *dev) | |
1564 | { | |
16735d02 | 1565 | reinit_completion(&dev->power.completion); |
5af84b82 | 1566 | |
431d452a | 1567 | if (is_async(dev)) { |
5af84b82 RW |
1568 | get_device(dev); |
1569 | async_schedule(async_suspend, dev); | |
1570 | return 0; | |
1571 | } | |
1572 | ||
1573 | return __device_suspend(dev, pm_transition, false); | |
1574 | } | |
1575 | ||
cd59abfc | 1576 | /** |
20d652d7 RW |
1577 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
1578 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1579 | */ |
91e7c75b | 1580 | int dpm_suspend(pm_message_t state) |
cd59abfc | 1581 | { |
ecf762b2 | 1582 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
1583 | int error = 0; |
1584 | ||
bb3632c6 | 1585 | trace_suspend_resume(TPS("dpm_suspend"), state.event, true); |
91e7c75b RW |
1586 | might_sleep(); |
1587 | ||
2f0aea93 VK |
1588 | cpufreq_suspend(); |
1589 | ||
cd59abfc | 1590 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
1591 | pm_transition = state; |
1592 | async_error = 0; | |
8a43a9ab RW |
1593 | while (!list_empty(&dpm_prepared_list)) { |
1594 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 1595 | |
1eede070 | 1596 | get_device(dev); |
cd59abfc | 1597 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 1598 | |
5af84b82 | 1599 | error = device_suspend(dev); |
1eede070 | 1600 | |
1b3cbec1 | 1601 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 1602 | if (error) { |
1eede070 | 1603 | pm_dev_err(dev, state, "", error); |
2a77c46d | 1604 | dpm_save_failed_dev(dev_name(dev)); |
1eede070 | 1605 | put_device(dev); |
775b64d2 RW |
1606 | break; |
1607 | } | |
7a8d37a3 | 1608 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1609 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 1610 | put_device(dev); |
5af84b82 RW |
1611 | if (async_error) |
1612 | break; | |
cd59abfc AS |
1613 | } |
1614 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
1615 | async_synchronize_full(); |
1616 | if (!error) | |
1617 | error = async_error; | |
2a77c46d SL |
1618 | if (error) { |
1619 | suspend_stats.failed_suspend++; | |
1620 | dpm_save_failed_step(SUSPEND_SUSPEND); | |
1621 | } else | |
ecf762b2 | 1622 | dpm_show_time(starttime, state, NULL); |
bb3632c6 | 1623 | trace_suspend_resume(TPS("dpm_suspend"), state.event, false); |
1eede070 RW |
1624 | return error; |
1625 | } | |
1626 | ||
1627 | /** | |
20d652d7 RW |
1628 | * device_prepare - Prepare a device for system power transition. |
1629 | * @dev: Device to handle. | |
1630 | * @state: PM transition of the system being carried out. | |
1631 | * | |
1632 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
1633 | * device may be registered after this function has returned. | |
1eede070 | 1634 | */ |
d1616302 | 1635 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 | 1636 | { |
35cd133c | 1637 | int (*callback)(struct device *) = NULL; |
aae4518b | 1638 | int ret = 0; |
1eede070 | 1639 | |
dbf37414 RW |
1640 | if (dev->power.syscore) |
1641 | return 0; | |
1642 | ||
88d26136 AS |
1643 | /* |
1644 | * If a device's parent goes into runtime suspend at the wrong time, | |
1645 | * it won't be possible to resume the device. To prevent this we | |
1646 | * block runtime suspend here, during the prepare phase, and allow | |
1647 | * it again during the complete phase. | |
1648 | */ | |
1649 | pm_runtime_get_noresume(dev); | |
1650 | ||
8e9394ce | 1651 | device_lock(dev); |
1eede070 | 1652 | |
4ca46ff3 RW |
1653 | dev->power.wakeup_path = device_may_wakeup(dev); |
1654 | ||
aa8e54b5 TV |
1655 | if (dev->power.no_pm_callbacks) { |
1656 | ret = 1; /* Let device go direct_complete */ | |
1657 | goto unlock; | |
1658 | } | |
1659 | ||
fba1fbf5 | 1660 | if (dev->pm_domain) |
35cd133c | 1661 | callback = dev->pm_domain->ops.prepare; |
fba1fbf5 | 1662 | else if (dev->type && dev->type->pm) |
35cd133c | 1663 | callback = dev->type->pm->prepare; |
fba1fbf5 | 1664 | else if (dev->class && dev->class->pm) |
35cd133c | 1665 | callback = dev->class->pm->prepare; |
fba1fbf5 | 1666 | else if (dev->bus && dev->bus->pm) |
35cd133c | 1667 | callback = dev->bus->pm->prepare; |
35cd133c | 1668 | |
fba1fbf5 | 1669 | if (!callback && dev->driver && dev->driver->pm) |
35cd133c | 1670 | callback = dev->driver->pm->prepare; |
35cd133c | 1671 | |
32e8d689 | 1672 | if (callback) |
aae4518b | 1673 | ret = callback(dev); |
7538e3db | 1674 | |
aa8e54b5 | 1675 | unlock: |
8e9394ce | 1676 | device_unlock(dev); |
1eede070 | 1677 | |
aae4518b RW |
1678 | if (ret < 0) { |
1679 | suspend_report_result(callback, ret); | |
aa1b9f13 | 1680 | pm_runtime_put(dev); |
aae4518b RW |
1681 | return ret; |
1682 | } | |
1683 | /* | |
1684 | * A positive return value from ->prepare() means "this device appears | |
1685 | * to be runtime-suspended and its state is fine, so if it really is | |
1686 | * runtime-suspended, you can leave it in that state provided that you | |
1687 | * will do the same thing with all of its descendants". This only | |
1688 | * applies to suspend transitions, however. | |
1689 | */ | |
1690 | spin_lock_irq(&dev->power.lock); | |
1691 | dev->power.direct_complete = ret > 0 && state.event == PM_EVENT_SUSPEND; | |
1692 | spin_unlock_irq(&dev->power.lock); | |
1693 | return 0; | |
1eede070 | 1694 | } |
cd59abfc | 1695 | |
1eede070 | 1696 | /** |
20d652d7 RW |
1697 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1698 | * @state: PM transition of the system being carried out. | |
1eede070 | 1699 | * |
20d652d7 | 1700 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 | 1701 | */ |
91e7c75b | 1702 | int dpm_prepare(pm_message_t state) |
1eede070 | 1703 | { |
1eede070 RW |
1704 | int error = 0; |
1705 | ||
bb3632c6 | 1706 | trace_suspend_resume(TPS("dpm_prepare"), state.event, true); |
91e7c75b RW |
1707 | might_sleep(); |
1708 | ||
013c074f SG |
1709 | /* |
1710 | * Give a chance for the known devices to complete their probes, before | |
1711 | * disable probing of devices. This sync point is important at least | |
1712 | * at boot time + hibernation restore. | |
1713 | */ | |
1714 | wait_for_device_probe(); | |
1715 | /* | |
1716 | * It is unsafe if probing of devices will happen during suspend or | |
1717 | * hibernation and system behavior will be unpredictable in this case. | |
1718 | * So, let's prohibit device's probing here and defer their probes | |
1719 | * instead. The normal behavior will be restored in dpm_complete(). | |
1720 | */ | |
1721 | device_block_probing(); | |
1722 | ||
1eede070 | 1723 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
1724 | while (!list_empty(&dpm_list)) { |
1725 | struct device *dev = to_device(dpm_list.next); | |
1726 | ||
1727 | get_device(dev); | |
1eede070 RW |
1728 | mutex_unlock(&dpm_list_mtx); |
1729 | ||
32e8d689 | 1730 | trace_device_pm_callback_start(dev, "", state.event); |
1e2ef05b | 1731 | error = device_prepare(dev, state); |
32e8d689 | 1732 | trace_device_pm_callback_end(dev, error); |
1eede070 RW |
1733 | |
1734 | mutex_lock(&dpm_list_mtx); | |
1735 | if (error) { | |
1eede070 RW |
1736 | if (error == -EAGAIN) { |
1737 | put_device(dev); | |
886a7a33 | 1738 | error = 0; |
1eede070 RW |
1739 | continue; |
1740 | } | |
1e75227e RW |
1741 | printk(KERN_INFO "PM: Device %s not prepared " |
1742 | "for power transition: code %d\n", | |
5c1a07ab | 1743 | dev_name(dev), error); |
1eede070 RW |
1744 | put_device(dev); |
1745 | break; | |
1746 | } | |
f76b168b | 1747 | dev->power.is_prepared = true; |
1eede070 | 1748 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1749 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1750 | put_device(dev); |
1751 | } | |
1eede070 | 1752 | mutex_unlock(&dpm_list_mtx); |
bb3632c6 | 1753 | trace_suspend_resume(TPS("dpm_prepare"), state.event, false); |
cd59abfc AS |
1754 | return error; |
1755 | } | |
1756 | ||
775b64d2 | 1757 | /** |
20d652d7 RW |
1758 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1759 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1760 | * |
20d652d7 RW |
1761 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1762 | * callbacks for them. | |
775b64d2 | 1763 | */ |
d1616302 | 1764 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1765 | { |
1766 | int error; | |
cd59abfc | 1767 | |
1eede070 | 1768 | error = dpm_prepare(state); |
2a77c46d SL |
1769 | if (error) { |
1770 | suspend_stats.failed_prepare++; | |
1771 | dpm_save_failed_step(SUSPEND_PREPARE); | |
1772 | } else | |
1eede070 | 1773 | error = dpm_suspend(state); |
cd59abfc | 1774 | return error; |
cd59abfc | 1775 | } |
d1616302 | 1776 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1777 | |
1778 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1779 | { | |
c80cfb04 BH |
1780 | if (ret) |
1781 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1782 | } |
1783 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1784 | |
1785 | /** | |
1786 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1787 | * @dev: Device to wait for. | |
1788 | * @subordinate: Device that needs to wait for @dev. | |
1789 | */ | |
098dff73 | 1790 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1791 | { |
1792 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1793 | return async_error; |
f8824cee RW |
1794 | } |
1795 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); | |
dfe3212e ML |
1796 | |
1797 | /** | |
1798 | * dpm_for_each_dev - device iterator. | |
1799 | * @data: data for the callback. | |
1800 | * @fn: function to be called for each device. | |
1801 | * | |
1802 | * Iterate over devices in dpm_list, and call @fn for each device, | |
1803 | * passing it @data. | |
1804 | */ | |
1805 | void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) | |
1806 | { | |
1807 | struct device *dev; | |
1808 | ||
1809 | if (!fn) | |
1810 | return; | |
1811 | ||
1812 | device_pm_lock(); | |
1813 | list_for_each_entry(dev, &dpm_list, power.entry) | |
1814 | fn(dev, data); | |
1815 | device_pm_unlock(); | |
1816 | } | |
1817 | EXPORT_SYMBOL_GPL(dpm_for_each_dev); | |
aa8e54b5 TV |
1818 | |
1819 | static bool pm_ops_is_empty(const struct dev_pm_ops *ops) | |
1820 | { | |
1821 | if (!ops) | |
1822 | return true; | |
1823 | ||
1824 | return !ops->prepare && | |
1825 | !ops->suspend && | |
1826 | !ops->suspend_late && | |
1827 | !ops->suspend_noirq && | |
1828 | !ops->resume_noirq && | |
1829 | !ops->resume_early && | |
1830 | !ops->resume && | |
1831 | !ops->complete; | |
1832 | } | |
1833 | ||
1834 | void device_pm_check_callbacks(struct device *dev) | |
1835 | { | |
1836 | spin_lock_irq(&dev->power.lock); | |
1837 | dev->power.no_pm_callbacks = | |
1838 | (!dev->bus || pm_ops_is_empty(dev->bus->pm)) && | |
1839 | (!dev->class || pm_ops_is_empty(dev->class->pm)) && | |
1840 | (!dev->type || pm_ops_is_empty(dev->type->pm)) && | |
1841 | (!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) && | |
1842 | (!dev->driver || pm_ops_is_empty(dev->driver->pm)); | |
1843 | spin_unlock_irq(&dev->power.lock); | |
1844 | } |