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