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 | ||
48059c09 | 421 | static void dpm_show_time(ktime_t starttime, pm_message_t state, int error, |
e3771fa9 | 422 | const char *info) |
ecf762b2 RW |
423 | { |
424 | ktime_t calltime; | |
0702d9ee | 425 | u64 usecs64; |
ecf762b2 RW |
426 | int usecs; |
427 | ||
428 | calltime = ktime_get(); | |
429 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
430 | do_div(usecs64, NSEC_PER_USEC); | |
431 | usecs = usecs64; | |
432 | if (usecs == 0) | |
433 | usecs = 1; | |
8d8b2441 | 434 | |
48059c09 | 435 | pm_pr_dbg("%s%s%s of devices %s after %ld.%03ld msecs\n", |
8d8b2441 | 436 | info ?: "", info ? " " : "", pm_verb(state.event), |
48059c09 | 437 | error ? "aborted" : "complete", |
8d8b2441 | 438 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); |
ecf762b2 RW |
439 | } |
440 | ||
9cf519d1 | 441 | static int dpm_run_callback(pm_callback_t cb, struct device *dev, |
e3771fa9 | 442 | pm_message_t state, const char *info) |
9cf519d1 RW |
443 | { |
444 | ktime_t calltime; | |
445 | int error; | |
446 | ||
447 | if (!cb) | |
448 | return 0; | |
449 | ||
450 | calltime = initcall_debug_start(dev); | |
451 | ||
452 | pm_dev_dbg(dev, state, info); | |
e8bca479 | 453 | trace_device_pm_callback_start(dev, info, state.event); |
9cf519d1 | 454 | error = cb(dev); |
e8bca479 | 455 | trace_device_pm_callback_end(dev, error); |
9cf519d1 RW |
456 | suspend_report_result(cb, error); |
457 | ||
53644677 | 458 | initcall_debug_report(dev, calltime, error, state, info); |
9cf519d1 RW |
459 | |
460 | return error; | |
461 | } | |
462 | ||
70fea60d BG |
463 | #ifdef CONFIG_DPM_WATCHDOG |
464 | struct dpm_watchdog { | |
465 | struct device *dev; | |
466 | struct task_struct *tsk; | |
467 | struct timer_list timer; | |
468 | }; | |
469 | ||
470 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) \ | |
471 | struct dpm_watchdog wd | |
472 | ||
473 | /** | |
474 | * dpm_watchdog_handler - Driver suspend / resume watchdog handler. | |
475 | * @data: Watchdog object address. | |
476 | * | |
477 | * Called when a driver has timed out suspending or resuming. | |
478 | * There's not much we can do here to recover so panic() to | |
479 | * capture a crash-dump in pstore. | |
480 | */ | |
481 | static void dpm_watchdog_handler(unsigned long data) | |
482 | { | |
483 | struct dpm_watchdog *wd = (void *)data; | |
484 | ||
485 | dev_emerg(wd->dev, "**** DPM device timeout ****\n"); | |
486 | show_stack(wd->tsk, NULL); | |
487 | panic("%s %s: unrecoverable failure\n", | |
488 | dev_driver_string(wd->dev), dev_name(wd->dev)); | |
489 | } | |
490 | ||
491 | /** | |
492 | * dpm_watchdog_set - Enable pm watchdog for given device. | |
493 | * @wd: Watchdog. Must be allocated on the stack. | |
494 | * @dev: Device to handle. | |
495 | */ | |
496 | static void dpm_watchdog_set(struct dpm_watchdog *wd, struct device *dev) | |
497 | { | |
498 | struct timer_list *timer = &wd->timer; | |
499 | ||
500 | wd->dev = dev; | |
501 | wd->tsk = current; | |
502 | ||
503 | init_timer_on_stack(timer); | |
504 | /* use same timeout value for both suspend and resume */ | |
505 | timer->expires = jiffies + HZ * CONFIG_DPM_WATCHDOG_TIMEOUT; | |
506 | timer->function = dpm_watchdog_handler; | |
507 | timer->data = (unsigned long)wd; | |
508 | add_timer(timer); | |
509 | } | |
510 | ||
511 | /** | |
512 | * dpm_watchdog_clear - Disable suspend/resume watchdog. | |
513 | * @wd: Watchdog to disable. | |
514 | */ | |
515 | static void dpm_watchdog_clear(struct dpm_watchdog *wd) | |
516 | { | |
517 | struct timer_list *timer = &wd->timer; | |
518 | ||
519 | del_timer_sync(timer); | |
520 | destroy_timer_on_stack(timer); | |
521 | } | |
522 | #else | |
523 | #define DECLARE_DPM_WATCHDOG_ON_STACK(wd) | |
524 | #define dpm_watchdog_set(x, y) | |
525 | #define dpm_watchdog_clear(x) | |
526 | #endif | |
527 | ||
cd59abfc AS |
528 | /*------------------------- Resume routines -------------------------*/ |
529 | ||
530 | /** | |
b082ddd8 | 531 | * device_resume_noirq - Execute a "noirq resume" callback for given device. |
20d652d7 RW |
532 | * @dev: Device to handle. |
533 | * @state: PM transition of the system being carried out. | |
58c256a3 | 534 | * @async: If true, the device is being resumed asynchronously. |
cd59abfc | 535 | * |
20d652d7 RW |
536 | * The driver of @dev will not receive interrupts while this function is being |
537 | * executed. | |
cd59abfc | 538 | */ |
76569faa | 539 | static int device_resume_noirq(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 540 | { |
9cf519d1 | 541 | pm_callback_t callback = NULL; |
e3771fa9 | 542 | const char *info = NULL; |
cd59abfc AS |
543 | int error = 0; |
544 | ||
545 | TRACE_DEVICE(dev); | |
546 | TRACE_RESUME(0); | |
547 | ||
aae4518b | 548 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
549 | goto Out; |
550 | ||
3d2699bc LC |
551 | if (!dev->power.is_noirq_suspended) |
552 | goto Out; | |
553 | ||
8c73b428 | 554 | dpm_wait_for_superior(dev, async); |
76569faa | 555 | |
564b905a | 556 | if (dev->pm_domain) { |
cf579dfb | 557 | info = "noirq power domain "; |
9cf519d1 | 558 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 559 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 560 | info = "noirq type "; |
9cf519d1 | 561 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 562 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 563 | info = "noirq class "; |
9cf519d1 | 564 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 565 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 566 | info = "noirq bus "; |
9cf519d1 | 567 | callback = pm_noirq_op(dev->bus->pm, state); |
e7176a37 DB |
568 | } |
569 | ||
35cd133c | 570 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 571 | info = "noirq driver "; |
35cd133c RW |
572 | callback = pm_noirq_op(dev->driver->pm, state); |
573 | } | |
574 | ||
9cf519d1 | 575 | error = dpm_run_callback(callback, dev, state, info); |
3d2699bc | 576 | dev->power.is_noirq_suspended = false; |
9cf519d1 | 577 | |
dbf37414 | 578 | Out: |
76569faa | 579 | complete_all(&dev->power.completion); |
775b64d2 RW |
580 | TRACE_RESUME(error); |
581 | return error; | |
582 | } | |
583 | ||
76569faa LC |
584 | static bool is_async(struct device *dev) |
585 | { | |
586 | return dev->power.async_suspend && pm_async_enabled | |
587 | && !pm_trace_is_enabled(); | |
588 | } | |
589 | ||
590 | static void async_resume_noirq(void *data, async_cookie_t cookie) | |
591 | { | |
592 | struct device *dev = (struct device *)data; | |
593 | int error; | |
594 | ||
595 | error = device_resume_noirq(dev, pm_transition, true); | |
596 | if (error) | |
597 | pm_dev_err(dev, pm_transition, " async", error); | |
598 | ||
599 | put_device(dev); | |
600 | } | |
601 | ||
786f41fb | 602 | void dpm_noirq_resume_devices(pm_message_t state) |
775b64d2 | 603 | { |
76569faa | 604 | struct device *dev; |
ecf762b2 | 605 | ktime_t starttime = ktime_get(); |
775b64d2 | 606 | |
bb3632c6 | 607 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, true); |
32bdfac5 | 608 | mutex_lock(&dpm_list_mtx); |
76569faa | 609 | pm_transition = state; |
d08a5ace | 610 | |
76569faa LC |
611 | /* |
612 | * Advanced the async threads upfront, | |
613 | * in case the starting of async threads is | |
614 | * delayed by non-async resuming devices. | |
615 | */ | |
616 | list_for_each_entry(dev, &dpm_noirq_list, power.entry) { | |
617 | reinit_completion(&dev->power.completion); | |
618 | if (is_async(dev)) { | |
619 | get_device(dev); | |
620 | async_schedule(async_resume_noirq, dev); | |
621 | } | |
622 | } | |
623 | ||
624 | while (!list_empty(&dpm_noirq_list)) { | |
625 | dev = to_device(dpm_noirq_list.next); | |
d08a5ace | 626 | get_device(dev); |
cf579dfb | 627 | list_move_tail(&dev->power.entry, &dpm_late_early_list); |
5b219a51 | 628 | mutex_unlock(&dpm_list_mtx); |
d08a5ace | 629 | |
76569faa LC |
630 | if (!is_async(dev)) { |
631 | int error; | |
632 | ||
633 | error = device_resume_noirq(dev, state, false); | |
634 | if (error) { | |
635 | suspend_stats.failed_resume_noirq++; | |
636 | dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); | |
637 | dpm_save_failed_dev(dev_name(dev)); | |
638 | pm_dev_err(dev, state, " noirq", error); | |
639 | } | |
cf579dfb RW |
640 | } |
641 | ||
642 | mutex_lock(&dpm_list_mtx); | |
643 | put_device(dev); | |
644 | } | |
645 | mutex_unlock(&dpm_list_mtx); | |
76569faa | 646 | async_synchronize_full(); |
48059c09 | 647 | dpm_show_time(starttime, state, 0, "noirq"); |
786f41fb RW |
648 | trace_suspend_resume(TPS("dpm_resume_noirq"), state.event, false); |
649 | } | |
650 | ||
651 | void dpm_noirq_end(void) | |
652 | { | |
cf579dfb | 653 | resume_device_irqs(); |
4990d4fe | 654 | device_wakeup_disarm_wake_irqs(); |
8651f97b | 655 | cpuidle_resume(); |
786f41fb RW |
656 | } |
657 | ||
658 | /** | |
659 | * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices. | |
660 | * @state: PM transition of the system being carried out. | |
661 | * | |
662 | * Invoke the "noirq" resume callbacks for all devices in dpm_noirq_list and | |
663 | * allow device drivers' interrupt handlers to be called. | |
664 | */ | |
665 | void dpm_resume_noirq(pm_message_t state) | |
666 | { | |
667 | dpm_noirq_resume_devices(state); | |
668 | dpm_noirq_end(); | |
cf579dfb RW |
669 | } |
670 | ||
671 | /** | |
672 | * device_resume_early - Execute an "early resume" callback for given device. | |
673 | * @dev: Device to handle. | |
674 | * @state: PM transition of the system being carried out. | |
58c256a3 | 675 | * @async: If true, the device is being resumed asynchronously. |
cf579dfb RW |
676 | * |
677 | * Runtime PM is disabled for @dev while this function is being executed. | |
678 | */ | |
9e5e7910 | 679 | static int device_resume_early(struct device *dev, pm_message_t state, bool async) |
cf579dfb RW |
680 | { |
681 | pm_callback_t callback = NULL; | |
e3771fa9 | 682 | const char *info = NULL; |
cf579dfb RW |
683 | int error = 0; |
684 | ||
685 | TRACE_DEVICE(dev); | |
686 | TRACE_RESUME(0); | |
687 | ||
aae4518b | 688 | if (dev->power.syscore || dev->power.direct_complete) |
dbf37414 RW |
689 | goto Out; |
690 | ||
3d2699bc LC |
691 | if (!dev->power.is_late_suspended) |
692 | goto Out; | |
693 | ||
8c73b428 | 694 | dpm_wait_for_superior(dev, async); |
9e5e7910 | 695 | |
cf579dfb RW |
696 | if (dev->pm_domain) { |
697 | info = "early power domain "; | |
698 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
699 | } else if (dev->type && dev->type->pm) { | |
700 | info = "early type "; | |
701 | callback = pm_late_early_op(dev->type->pm, state); | |
702 | } else if (dev->class && dev->class->pm) { | |
703 | info = "early class "; | |
704 | callback = pm_late_early_op(dev->class->pm, state); | |
705 | } else if (dev->bus && dev->bus->pm) { | |
706 | info = "early bus "; | |
707 | callback = pm_late_early_op(dev->bus->pm, state); | |
708 | } | |
709 | ||
710 | if (!callback && dev->driver && dev->driver->pm) { | |
711 | info = "early driver "; | |
712 | callback = pm_late_early_op(dev->driver->pm, state); | |
713 | } | |
714 | ||
715 | error = dpm_run_callback(callback, dev, state, info); | |
3d2699bc | 716 | dev->power.is_late_suspended = false; |
cf579dfb | 717 | |
dbf37414 | 718 | Out: |
cf579dfb | 719 | TRACE_RESUME(error); |
9f6d8f6a RW |
720 | |
721 | pm_runtime_enable(dev); | |
9e5e7910 | 722 | complete_all(&dev->power.completion); |
cf579dfb RW |
723 | return error; |
724 | } | |
725 | ||
9e5e7910 LC |
726 | static void async_resume_early(void *data, async_cookie_t cookie) |
727 | { | |
728 | struct device *dev = (struct device *)data; | |
729 | int error; | |
730 | ||
731 | error = device_resume_early(dev, pm_transition, true); | |
732 | if (error) | |
733 | pm_dev_err(dev, pm_transition, " async", error); | |
734 | ||
735 | put_device(dev); | |
736 | } | |
737 | ||
cf579dfb RW |
738 | /** |
739 | * dpm_resume_early - Execute "early resume" callbacks for all devices. | |
740 | * @state: PM transition of the system being carried out. | |
741 | */ | |
2a8a8ce6 | 742 | void dpm_resume_early(pm_message_t state) |
cf579dfb | 743 | { |
9e5e7910 | 744 | struct device *dev; |
cf579dfb RW |
745 | ktime_t starttime = ktime_get(); |
746 | ||
bb3632c6 | 747 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, true); |
cf579dfb | 748 | mutex_lock(&dpm_list_mtx); |
9e5e7910 LC |
749 | pm_transition = state; |
750 | ||
751 | /* | |
752 | * Advanced the async threads upfront, | |
753 | * in case the starting of async threads is | |
754 | * delayed by non-async resuming devices. | |
755 | */ | |
756 | list_for_each_entry(dev, &dpm_late_early_list, power.entry) { | |
757 | reinit_completion(&dev->power.completion); | |
758 | if (is_async(dev)) { | |
759 | get_device(dev); | |
760 | async_schedule(async_resume_early, dev); | |
761 | } | |
762 | } | |
cf579dfb | 763 | |
9e5e7910 LC |
764 | while (!list_empty(&dpm_late_early_list)) { |
765 | dev = to_device(dpm_late_early_list.next); | |
cf579dfb RW |
766 | get_device(dev); |
767 | list_move_tail(&dev->power.entry, &dpm_suspended_list); | |
768 | mutex_unlock(&dpm_list_mtx); | |
769 | ||
9e5e7910 LC |
770 | if (!is_async(dev)) { |
771 | int error; | |
d08a5ace | 772 | |
9e5e7910 LC |
773 | error = device_resume_early(dev, state, false); |
774 | if (error) { | |
775 | suspend_stats.failed_resume_early++; | |
776 | dpm_save_failed_step(SUSPEND_RESUME_EARLY); | |
777 | dpm_save_failed_dev(dev_name(dev)); | |
778 | pm_dev_err(dev, state, " early", error); | |
779 | } | |
780 | } | |
5b219a51 | 781 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
782 | put_device(dev); |
783 | } | |
32bdfac5 | 784 | mutex_unlock(&dpm_list_mtx); |
9e5e7910 | 785 | async_synchronize_full(); |
48059c09 | 786 | dpm_show_time(starttime, state, 0, "early"); |
bb3632c6 | 787 | trace_suspend_resume(TPS("dpm_resume_early"), state.event, false); |
775b64d2 | 788 | } |
cf579dfb RW |
789 | |
790 | /** | |
791 | * dpm_resume_start - Execute "noirq" and "early" device callbacks. | |
792 | * @state: PM transition of the system being carried out. | |
793 | */ | |
794 | void dpm_resume_start(pm_message_t state) | |
795 | { | |
796 | dpm_resume_noirq(state); | |
797 | dpm_resume_early(state); | |
798 | } | |
799 | EXPORT_SYMBOL_GPL(dpm_resume_start); | |
775b64d2 RW |
800 | |
801 | /** | |
97df8c12 | 802 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
803 | * @dev: Device to handle. |
804 | * @state: PM transition of the system being carried out. | |
5af84b82 | 805 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 806 | */ |
97df8c12 | 807 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 808 | { |
9cf519d1 | 809 | pm_callback_t callback = NULL; |
e3771fa9 | 810 | const char *info = NULL; |
775b64d2 | 811 | int error = 0; |
70fea60d | 812 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
775b64d2 RW |
813 | |
814 | TRACE_DEVICE(dev); | |
815 | TRACE_RESUME(0); | |
cd59abfc | 816 | |
dbf37414 RW |
817 | if (dev->power.syscore) |
818 | goto Complete; | |
819 | ||
aae4518b RW |
820 | if (dev->power.direct_complete) { |
821 | /* Match the pm_runtime_disable() in __device_suspend(). */ | |
822 | pm_runtime_enable(dev); | |
823 | goto Complete; | |
824 | } | |
825 | ||
8c73b428 | 826 | dpm_wait_for_superior(dev, async); |
70fea60d | 827 | dpm_watchdog_set(&wd, dev); |
8e9394ce | 828 | device_lock(dev); |
7a8d37a3 | 829 | |
f76b168b AS |
830 | /* |
831 | * This is a fib. But we'll allow new children to be added below | |
832 | * a resumed device, even if the device hasn't been completed yet. | |
833 | */ | |
834 | dev->power.is_prepared = false; | |
97df8c12 | 835 | |
6d0e0e84 AS |
836 | if (!dev->power.is_suspended) |
837 | goto Unlock; | |
838 | ||
564b905a | 839 | if (dev->pm_domain) { |
9cf519d1 RW |
840 | info = "power domain "; |
841 | callback = pm_op(&dev->pm_domain->ops, state); | |
35cd133c | 842 | goto Driver; |
7538e3db RW |
843 | } |
844 | ||
9659cc06 | 845 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
846 | info = "type "; |
847 | callback = pm_op(dev->type->pm, state); | |
35cd133c | 848 | goto Driver; |
cd59abfc AS |
849 | } |
850 | ||
a380f2ed RW |
851 | if (dev->class && dev->class->pm) { |
852 | info = "class "; | |
853 | callback = pm_op(dev->class->pm, state); | |
854 | goto Driver; | |
cd59abfc | 855 | } |
9659cc06 RW |
856 | |
857 | if (dev->bus) { | |
858 | if (dev->bus->pm) { | |
35cd133c | 859 | info = "bus "; |
9cf519d1 | 860 | callback = pm_op(dev->bus->pm, state); |
9659cc06 | 861 | } else if (dev->bus->resume) { |
35cd133c | 862 | info = "legacy bus "; |
9cf519d1 | 863 | callback = dev->bus->resume; |
35cd133c | 864 | goto End; |
9659cc06 RW |
865 | } |
866 | } | |
867 | ||
35cd133c RW |
868 | Driver: |
869 | if (!callback && dev->driver && dev->driver->pm) { | |
870 | info = "driver "; | |
871 | callback = pm_op(dev->driver->pm, state); | |
872 | } | |
873 | ||
1eede070 | 874 | End: |
9cf519d1 | 875 | error = dpm_run_callback(callback, dev, state, info); |
6d0e0e84 AS |
876 | dev->power.is_suspended = false; |
877 | ||
878 | Unlock: | |
8e9394ce | 879 | device_unlock(dev); |
70fea60d | 880 | dpm_watchdog_clear(&wd); |
dbf37414 RW |
881 | |
882 | Complete: | |
5af84b82 | 883 | complete_all(&dev->power.completion); |
7a8d37a3 | 884 | |
cd59abfc | 885 | TRACE_RESUME(error); |
1e2ef05b | 886 | |
cd59abfc AS |
887 | return error; |
888 | } | |
889 | ||
5af84b82 RW |
890 | static void async_resume(void *data, async_cookie_t cookie) |
891 | { | |
892 | struct device *dev = (struct device *)data; | |
893 | int error; | |
894 | ||
97df8c12 | 895 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
896 | if (error) |
897 | pm_dev_err(dev, pm_transition, " async", error); | |
898 | put_device(dev); | |
899 | } | |
900 | ||
775b64d2 | 901 | /** |
20d652d7 RW |
902 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
903 | * @state: PM transition of the system being carried out. | |
775b64d2 | 904 | * |
20d652d7 RW |
905 | * Execute the appropriate "resume" callback for all devices whose status |
906 | * indicates that they are suspended. | |
1eede070 | 907 | */ |
91e7c75b | 908 | void dpm_resume(pm_message_t state) |
1eede070 | 909 | { |
97df8c12 | 910 | struct device *dev; |
ecf762b2 | 911 | ktime_t starttime = ktime_get(); |
1eede070 | 912 | |
bb3632c6 | 913 | trace_suspend_resume(TPS("dpm_resume"), state.event, true); |
91e7c75b RW |
914 | might_sleep(); |
915 | ||
1eede070 | 916 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 917 | pm_transition = state; |
098dff73 | 918 | async_error = 0; |
1eede070 | 919 | |
8a43a9ab | 920 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
16735d02 | 921 | reinit_completion(&dev->power.completion); |
97df8c12 RW |
922 | if (is_async(dev)) { |
923 | get_device(dev); | |
924 | async_schedule(async_resume, dev); | |
925 | } | |
926 | } | |
927 | ||
8a43a9ab RW |
928 | while (!list_empty(&dpm_suspended_list)) { |
929 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 930 | get_device(dev); |
5b219a51 | 931 | if (!is_async(dev)) { |
1eede070 RW |
932 | int error; |
933 | ||
1eede070 RW |
934 | mutex_unlock(&dpm_list_mtx); |
935 | ||
97df8c12 | 936 | error = device_resume(dev, state, false); |
2a77c46d SL |
937 | if (error) { |
938 | suspend_stats.failed_resume++; | |
939 | dpm_save_failed_step(SUSPEND_RESUME); | |
940 | dpm_save_failed_dev(dev_name(dev)); | |
1eede070 | 941 | pm_dev_err(dev, state, "", error); |
2a77c46d | 942 | } |
5b219a51 RW |
943 | |
944 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
945 | } |
946 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 947 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
948 | put_device(dev); |
949 | } | |
1eede070 | 950 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 951 | async_synchronize_full(); |
48059c09 | 952 | dpm_show_time(starttime, state, 0, NULL); |
2f0aea93 VK |
953 | |
954 | cpufreq_resume(); | |
bb3632c6 | 955 | trace_suspend_resume(TPS("dpm_resume"), state.event, false); |
1eede070 RW |
956 | } |
957 | ||
958 | /** | |
20d652d7 RW |
959 | * device_complete - Complete a PM transition for given device. |
960 | * @dev: Device to handle. | |
961 | * @state: PM transition of the system being carried out. | |
1eede070 | 962 | */ |
d1616302 | 963 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 964 | { |
35cd133c | 965 | void (*callback)(struct device *) = NULL; |
e3771fa9 | 966 | const char *info = NULL; |
35cd133c | 967 | |
dbf37414 RW |
968 | if (dev->power.syscore) |
969 | return; | |
970 | ||
8e9394ce | 971 | device_lock(dev); |
1eede070 | 972 | |
564b905a | 973 | if (dev->pm_domain) { |
35cd133c RW |
974 | info = "completing power domain "; |
975 | callback = dev->pm_domain->ops.complete; | |
4d27e9dc | 976 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
977 | info = "completing type "; |
978 | callback = dev->type->pm->complete; | |
9659cc06 | 979 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
980 | info = "completing class "; |
981 | callback = dev->class->pm->complete; | |
9659cc06 | 982 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
983 | info = "completing bus "; |
984 | callback = dev->bus->pm->complete; | |
985 | } | |
986 | ||
987 | if (!callback && dev->driver && dev->driver->pm) { | |
988 | info = "completing driver "; | |
989 | callback = dev->driver->pm->complete; | |
990 | } | |
991 | ||
992 | if (callback) { | |
993 | pm_dev_dbg(dev, state, info); | |
994 | callback(dev); | |
1eede070 RW |
995 | } |
996 | ||
8e9394ce | 997 | device_unlock(dev); |
88d26136 | 998 | |
af939339 | 999 | pm_runtime_put(dev); |
1eede070 RW |
1000 | } |
1001 | ||
1002 | /** | |
20d652d7 RW |
1003 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
1004 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1005 | * |
20d652d7 RW |
1006 | * Execute the ->complete() callbacks for all devices whose PM status is not |
1007 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 1008 | */ |
91e7c75b | 1009 | void dpm_complete(pm_message_t state) |
cd59abfc | 1010 | { |
1eede070 RW |
1011 | struct list_head list; |
1012 | ||
bb3632c6 | 1013 | trace_suspend_resume(TPS("dpm_complete"), state.event, true); |
91e7c75b RW |
1014 | might_sleep(); |
1015 | ||
1eede070 | 1016 | INIT_LIST_HEAD(&list); |
cd59abfc | 1017 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
1018 | while (!list_empty(&dpm_prepared_list)) { |
1019 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 1020 | |
1eede070 | 1021 | get_device(dev); |
f76b168b | 1022 | dev->power.is_prepared = false; |
5b219a51 RW |
1023 | list_move(&dev->power.entry, &list); |
1024 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 1025 | |
32e8d689 | 1026 | trace_device_pm_callback_start(dev, "", state.event); |
5b219a51 | 1027 | device_complete(dev, state); |
32e8d689 | 1028 | trace_device_pm_callback_end(dev, 0); |
1eede070 | 1029 | |
5b219a51 | 1030 | mutex_lock(&dpm_list_mtx); |
1eede070 | 1031 | put_device(dev); |
cd59abfc | 1032 | } |
1eede070 | 1033 | list_splice(&list, &dpm_list); |
cd59abfc | 1034 | mutex_unlock(&dpm_list_mtx); |
013c074f SG |
1035 | |
1036 | /* Allow device probing and trigger re-probing of deferred devices */ | |
1037 | device_unblock_probing(); | |
bb3632c6 | 1038 | trace_suspend_resume(TPS("dpm_complete"), state.event, false); |
cd59abfc AS |
1039 | } |
1040 | ||
cd59abfc | 1041 | /** |
20d652d7 RW |
1042 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
1043 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1044 | * |
20d652d7 RW |
1045 | * Execute "resume" callbacks for all devices and complete the PM transition of |
1046 | * the system. | |
cd59abfc | 1047 | */ |
d1616302 | 1048 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 1049 | { |
1eede070 RW |
1050 | dpm_resume(state); |
1051 | dpm_complete(state); | |
cd59abfc | 1052 | } |
d1616302 | 1053 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
1054 | |
1055 | ||
1056 | /*------------------------- Suspend routines -------------------------*/ | |
1057 | ||
1eede070 | 1058 | /** |
20d652d7 RW |
1059 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
1060 | * @sleep_state: PM message representing a sleep state. | |
1061 | * | |
1062 | * Return a PM message representing the resume event corresponding to given | |
1063 | * sleep state. | |
1eede070 RW |
1064 | */ |
1065 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 1066 | { |
1eede070 RW |
1067 | switch (sleep_state.event) { |
1068 | case PM_EVENT_SUSPEND: | |
1069 | return PMSG_RESUME; | |
1070 | case PM_EVENT_FREEZE: | |
1071 | case PM_EVENT_QUIESCE: | |
1072 | return PMSG_RECOVER; | |
1073 | case PM_EVENT_HIBERNATE: | |
1074 | return PMSG_RESTORE; | |
cd59abfc | 1075 | } |
1eede070 | 1076 | return PMSG_ON; |
cd59abfc AS |
1077 | } |
1078 | ||
1079 | /** | |
b082ddd8 | 1080 | * __device_suspend_noirq - Execute a "noirq suspend" callback for given device. |
20d652d7 RW |
1081 | * @dev: Device to handle. |
1082 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1083 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1084 | * |
20d652d7 RW |
1085 | * The driver of @dev will not receive interrupts while this function is being |
1086 | * executed. | |
cd59abfc | 1087 | */ |
28b6fd6e | 1088 | static int __device_suspend_noirq(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 1089 | { |
9cf519d1 | 1090 | pm_callback_t callback = NULL; |
e3771fa9 | 1091 | const char *info = NULL; |
28b6fd6e LC |
1092 | int error = 0; |
1093 | ||
431d452a ZF |
1094 | TRACE_DEVICE(dev); |
1095 | TRACE_SUSPEND(0); | |
1096 | ||
098c3055 | 1097 | dpm_wait_for_subordinate(dev, async); |
6f75c3fd | 1098 | |
28b6fd6e LC |
1099 | if (async_error) |
1100 | goto Complete; | |
1101 | ||
9a3ebe35 RW |
1102 | if (pm_wakeup_pending()) { |
1103 | async_error = -EBUSY; | |
1104 | goto Complete; | |
1105 | } | |
1106 | ||
aae4518b | 1107 | if (dev->power.syscore || dev->power.direct_complete) |
28b6fd6e LC |
1108 | goto Complete; |
1109 | ||
564b905a | 1110 | if (dev->pm_domain) { |
cf579dfb | 1111 | info = "noirq power domain "; |
9cf519d1 | 1112 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 1113 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 1114 | info = "noirq type "; |
9cf519d1 | 1115 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 1116 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 1117 | info = "noirq class "; |
9cf519d1 | 1118 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 1119 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 1120 | info = "noirq bus "; |
9cf519d1 | 1121 | callback = pm_noirq_op(dev->bus->pm, state); |
7538e3db RW |
1122 | } |
1123 | ||
35cd133c | 1124 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 1125 | info = "noirq driver "; |
35cd133c RW |
1126 | callback = pm_noirq_op(dev->driver->pm, state); |
1127 | } | |
1128 | ||
3d2699bc LC |
1129 | error = dpm_run_callback(callback, dev, state, info); |
1130 | if (!error) | |
1131 | dev->power.is_noirq_suspended = true; | |
28b6fd6e LC |
1132 | else |
1133 | async_error = error; | |
3d2699bc | 1134 | |
28b6fd6e LC |
1135 | Complete: |
1136 | complete_all(&dev->power.completion); | |
431d452a | 1137 | TRACE_SUSPEND(error); |
3d2699bc | 1138 | return error; |
775b64d2 RW |
1139 | } |
1140 | ||
28b6fd6e LC |
1141 | static void async_suspend_noirq(void *data, async_cookie_t cookie) |
1142 | { | |
1143 | struct device *dev = (struct device *)data; | |
1144 | int error; | |
1145 | ||
1146 | error = __device_suspend_noirq(dev, pm_transition, true); | |
1147 | if (error) { | |
1148 | dpm_save_failed_dev(dev_name(dev)); | |
1149 | pm_dev_err(dev, pm_transition, " async", error); | |
1150 | } | |
1151 | ||
1152 | put_device(dev); | |
1153 | } | |
1154 | ||
1155 | static int device_suspend_noirq(struct device *dev) | |
1156 | { | |
1157 | reinit_completion(&dev->power.completion); | |
1158 | ||
431d452a | 1159 | if (is_async(dev)) { |
28b6fd6e LC |
1160 | get_device(dev); |
1161 | async_schedule(async_suspend_noirq, dev); | |
1162 | return 0; | |
1163 | } | |
1164 | return __device_suspend_noirq(dev, pm_transition, false); | |
1165 | } | |
1166 | ||
786f41fb RW |
1167 | void dpm_noirq_begin(void) |
1168 | { | |
1169 | cpuidle_pause(); | |
1170 | device_wakeup_arm_wake_irqs(); | |
1171 | suspend_device_irqs(); | |
1172 | } | |
1173 | ||
1174 | int dpm_noirq_suspend_devices(pm_message_t state) | |
775b64d2 | 1175 | { |
ecf762b2 | 1176 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
1177 | int error = 0; |
1178 | ||
bb3632c6 | 1179 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, true); |
32bdfac5 | 1180 | mutex_lock(&dpm_list_mtx); |
28b6fd6e LC |
1181 | pm_transition = state; |
1182 | async_error = 0; | |
1183 | ||
cf579dfb RW |
1184 | while (!list_empty(&dpm_late_early_list)) { |
1185 | struct device *dev = to_device(dpm_late_early_list.prev); | |
d08a5ace RW |
1186 | |
1187 | get_device(dev); | |
1188 | mutex_unlock(&dpm_list_mtx); | |
1189 | ||
28b6fd6e | 1190 | error = device_suspend_noirq(dev); |
d08a5ace RW |
1191 | |
1192 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 1193 | if (error) { |
cf579dfb | 1194 | pm_dev_err(dev, state, " noirq", error); |
2a77c46d | 1195 | dpm_save_failed_dev(dev_name(dev)); |
d08a5ace | 1196 | put_device(dev); |
775b64d2 RW |
1197 | break; |
1198 | } | |
d08a5ace | 1199 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1200 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 1201 | put_device(dev); |
52d136cc | 1202 | |
28b6fd6e | 1203 | if (async_error) |
52d136cc | 1204 | break; |
775b64d2 | 1205 | } |
32bdfac5 | 1206 | mutex_unlock(&dpm_list_mtx); |
28b6fd6e LC |
1207 | async_synchronize_full(); |
1208 | if (!error) | |
1209 | error = async_error; | |
1210 | ||
1211 | if (error) { | |
1212 | suspend_stats.failed_suspend_noirq++; | |
1213 | dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); | |
28b6fd6e | 1214 | } |
48059c09 | 1215 | dpm_show_time(starttime, state, error, "noirq"); |
bb3632c6 | 1216 | trace_suspend_resume(TPS("dpm_suspend_noirq"), state.event, false); |
cf579dfb RW |
1217 | return error; |
1218 | } | |
1219 | ||
786f41fb RW |
1220 | /** |
1221 | * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices. | |
1222 | * @state: PM transition of the system being carried out. | |
1223 | * | |
1224 | * Prevent device drivers' interrupt handlers from being called and invoke | |
1225 | * "noirq" suspend callbacks for all non-sysdev devices. | |
1226 | */ | |
1227 | int dpm_suspend_noirq(pm_message_t state) | |
1228 | { | |
1229 | int ret; | |
1230 | ||
1231 | dpm_noirq_begin(); | |
1232 | ret = dpm_noirq_suspend_devices(state); | |
1233 | if (ret) | |
1234 | dpm_resume_noirq(resume_event(state)); | |
1235 | ||
1236 | return ret; | |
1237 | } | |
1238 | ||
cf579dfb | 1239 | /** |
b082ddd8 | 1240 | * __device_suspend_late - Execute a "late suspend" callback for given device. |
cf579dfb RW |
1241 | * @dev: Device to handle. |
1242 | * @state: PM transition of the system being carried out. | |
58c256a3 | 1243 | * @async: If true, the device is being suspended asynchronously. |
cf579dfb RW |
1244 | * |
1245 | * Runtime PM is disabled for @dev while this function is being executed. | |
1246 | */ | |
de377b39 | 1247 | static int __device_suspend_late(struct device *dev, pm_message_t state, bool async) |
cf579dfb RW |
1248 | { |
1249 | pm_callback_t callback = NULL; | |
e3771fa9 | 1250 | const char *info = NULL; |
de377b39 | 1251 | int error = 0; |
cf579dfb | 1252 | |
431d452a ZF |
1253 | TRACE_DEVICE(dev); |
1254 | TRACE_SUSPEND(0); | |
1255 | ||
9f6d8f6a RW |
1256 | __pm_runtime_disable(dev, false); |
1257 | ||
098c3055 | 1258 | dpm_wait_for_subordinate(dev, async); |
6f75c3fd | 1259 | |
de377b39 LC |
1260 | if (async_error) |
1261 | goto Complete; | |
1262 | ||
1263 | if (pm_wakeup_pending()) { | |
1264 | async_error = -EBUSY; | |
1265 | goto Complete; | |
1266 | } | |
1267 | ||
aae4518b | 1268 | if (dev->power.syscore || dev->power.direct_complete) |
de377b39 LC |
1269 | goto Complete; |
1270 | ||
cf579dfb RW |
1271 | if (dev->pm_domain) { |
1272 | info = "late power domain "; | |
1273 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
1274 | } else if (dev->type && dev->type->pm) { | |
1275 | info = "late type "; | |
1276 | callback = pm_late_early_op(dev->type->pm, state); | |
1277 | } else if (dev->class && dev->class->pm) { | |
1278 | info = "late class "; | |
1279 | callback = pm_late_early_op(dev->class->pm, state); | |
1280 | } else if (dev->bus && dev->bus->pm) { | |
1281 | info = "late bus "; | |
1282 | callback = pm_late_early_op(dev->bus->pm, state); | |
1283 | } | |
1284 | ||
1285 | if (!callback && dev->driver && dev->driver->pm) { | |
1286 | info = "late driver "; | |
1287 | callback = pm_late_early_op(dev->driver->pm, state); | |
1288 | } | |
1289 | ||
3d2699bc LC |
1290 | error = dpm_run_callback(callback, dev, state, info); |
1291 | if (!error) | |
1292 | dev->power.is_late_suspended = true; | |
de377b39 LC |
1293 | else |
1294 | async_error = error; | |
3d2699bc | 1295 | |
de377b39 | 1296 | Complete: |
431d452a | 1297 | TRACE_SUSPEND(error); |
de377b39 | 1298 | complete_all(&dev->power.completion); |
3d2699bc | 1299 | return error; |
cf579dfb RW |
1300 | } |
1301 | ||
de377b39 LC |
1302 | static void async_suspend_late(void *data, async_cookie_t cookie) |
1303 | { | |
1304 | struct device *dev = (struct device *)data; | |
1305 | int error; | |
1306 | ||
1307 | error = __device_suspend_late(dev, pm_transition, true); | |
1308 | if (error) { | |
1309 | dpm_save_failed_dev(dev_name(dev)); | |
1310 | pm_dev_err(dev, pm_transition, " async", error); | |
1311 | } | |
1312 | put_device(dev); | |
1313 | } | |
1314 | ||
1315 | static int device_suspend_late(struct device *dev) | |
1316 | { | |
1317 | reinit_completion(&dev->power.completion); | |
1318 | ||
431d452a | 1319 | if (is_async(dev)) { |
de377b39 LC |
1320 | get_device(dev); |
1321 | async_schedule(async_suspend_late, dev); | |
1322 | return 0; | |
1323 | } | |
1324 | ||
1325 | return __device_suspend_late(dev, pm_transition, false); | |
1326 | } | |
1327 | ||
cf579dfb RW |
1328 | /** |
1329 | * dpm_suspend_late - Execute "late suspend" callbacks for all devices. | |
1330 | * @state: PM transition of the system being carried out. | |
1331 | */ | |
2a8a8ce6 | 1332 | int dpm_suspend_late(pm_message_t state) |
cf579dfb RW |
1333 | { |
1334 | ktime_t starttime = ktime_get(); | |
1335 | int error = 0; | |
1336 | ||
bb3632c6 | 1337 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, true); |
cf579dfb | 1338 | mutex_lock(&dpm_list_mtx); |
de377b39 LC |
1339 | pm_transition = state; |
1340 | async_error = 0; | |
1341 | ||
cf579dfb RW |
1342 | while (!list_empty(&dpm_suspended_list)) { |
1343 | struct device *dev = to_device(dpm_suspended_list.prev); | |
1344 | ||
1345 | get_device(dev); | |
1346 | mutex_unlock(&dpm_list_mtx); | |
1347 | ||
de377b39 | 1348 | error = device_suspend_late(dev); |
cf579dfb RW |
1349 | |
1350 | mutex_lock(&dpm_list_mtx); | |
3a17fb32 RW |
1351 | if (!list_empty(&dev->power.entry)) |
1352 | list_move(&dev->power.entry, &dpm_late_early_list); | |
1353 | ||
cf579dfb RW |
1354 | if (error) { |
1355 | pm_dev_err(dev, state, " late", error); | |
cf579dfb RW |
1356 | dpm_save_failed_dev(dev_name(dev)); |
1357 | put_device(dev); | |
1358 | break; | |
1359 | } | |
cf579dfb | 1360 | put_device(dev); |
52d136cc | 1361 | |
de377b39 | 1362 | if (async_error) |
52d136cc | 1363 | break; |
cf579dfb RW |
1364 | } |
1365 | mutex_unlock(&dpm_list_mtx); | |
de377b39 | 1366 | async_synchronize_full(); |
246ef766 ID |
1367 | if (!error) |
1368 | error = async_error; | |
de377b39 LC |
1369 | if (error) { |
1370 | suspend_stats.failed_suspend_late++; | |
1371 | dpm_save_failed_step(SUSPEND_SUSPEND_LATE); | |
cf579dfb | 1372 | dpm_resume_early(resume_event(state)); |
de377b39 | 1373 | } |
48059c09 | 1374 | dpm_show_time(starttime, state, error, "late"); |
bb3632c6 | 1375 | trace_suspend_resume(TPS("dpm_suspend_late"), state.event, false); |
775b64d2 RW |
1376 | return error; |
1377 | } | |
cf579dfb RW |
1378 | |
1379 | /** | |
1380 | * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks. | |
1381 | * @state: PM transition of the system being carried out. | |
1382 | */ | |
1383 | int dpm_suspend_end(pm_message_t state) | |
1384 | { | |
1385 | int error = dpm_suspend_late(state); | |
064b021f CC |
1386 | if (error) |
1387 | return error; | |
1388 | ||
1389 | error = dpm_suspend_noirq(state); | |
1390 | if (error) { | |
997a0311 | 1391 | dpm_resume_early(resume_event(state)); |
064b021f CC |
1392 | return error; |
1393 | } | |
cf579dfb | 1394 | |
064b021f | 1395 | return 0; |
cf579dfb RW |
1396 | } |
1397 | EXPORT_SYMBOL_GPL(dpm_suspend_end); | |
775b64d2 | 1398 | |
875ab0b7 RW |
1399 | /** |
1400 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
1401 | * @dev: Device to suspend. |
1402 | * @state: PM transition of the system being carried out. | |
1403 | * @cb: Suspend callback to execute. | |
58c256a3 | 1404 | * @info: string description of caller. |
875ab0b7 RW |
1405 | */ |
1406 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
53644677 | 1407 | int (*cb)(struct device *dev, pm_message_t state), |
e3771fa9 | 1408 | const char *info) |
875ab0b7 RW |
1409 | { |
1410 | int error; | |
1411 | ktime_t calltime; | |
1412 | ||
1413 | calltime = initcall_debug_start(dev); | |
1414 | ||
e8bca479 | 1415 | trace_device_pm_callback_start(dev, info, state.event); |
875ab0b7 | 1416 | error = cb(dev, state); |
e8bca479 | 1417 | trace_device_pm_callback_end(dev, error); |
875ab0b7 RW |
1418 | suspend_report_result(cb, error); |
1419 | ||
53644677 | 1420 | initcall_debug_report(dev, calltime, error, state, info); |
875ab0b7 RW |
1421 | |
1422 | return error; | |
1423 | } | |
1424 | ||
8c73b428 RW |
1425 | static void dpm_clear_suppliers_direct_complete(struct device *dev) |
1426 | { | |
1427 | struct device_link *link; | |
1428 | int idx; | |
1429 | ||
1430 | idx = device_links_read_lock(); | |
1431 | ||
1432 | list_for_each_entry_rcu(link, &dev->links.suppliers, c_node) { | |
1433 | spin_lock_irq(&link->supplier->power.lock); | |
1434 | link->supplier->power.direct_complete = false; | |
1435 | spin_unlock_irq(&link->supplier->power.lock); | |
1436 | } | |
1437 | ||
1438 | device_links_read_unlock(idx); | |
1439 | } | |
1440 | ||
775b64d2 | 1441 | /** |
b082ddd8 | 1442 | * __device_suspend - Execute "suspend" callbacks for given device. |
20d652d7 RW |
1443 | * @dev: Device to handle. |
1444 | * @state: PM transition of the system being carried out. | |
5af84b82 | 1445 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1446 | */ |
5af84b82 | 1447 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 1448 | { |
9cf519d1 | 1449 | pm_callback_t callback = NULL; |
e3771fa9 | 1450 | const char *info = NULL; |
cd59abfc | 1451 | int error = 0; |
70fea60d | 1452 | DECLARE_DPM_WATCHDOG_ON_STACK(wd); |
cd59abfc | 1453 | |
431d452a ZF |
1454 | TRACE_DEVICE(dev); |
1455 | TRACE_SUSPEND(0); | |
1456 | ||
8c73b428 | 1457 | dpm_wait_for_subordinate(dev, async); |
7a8d37a3 | 1458 | |
5af84b82 | 1459 | if (async_error) |
1f758b23 | 1460 | goto Complete; |
1e2ef05b | 1461 | |
88d26136 AS |
1462 | /* |
1463 | * If a device configured to wake up the system from sleep states | |
1464 | * has been suspended at run time and there's a resume request pending | |
1465 | * for it, this is equivalent to the device signaling wakeup, so the | |
1466 | * system suspend operation should be aborted. | |
1467 | */ | |
1e2ef05b RW |
1468 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1469 | pm_wakeup_event(dev, 0); | |
5af84b82 | 1470 | |
d83f905e RW |
1471 | if (pm_wakeup_pending()) { |
1472 | async_error = -EBUSY; | |
1f758b23 | 1473 | goto Complete; |
d83f905e RW |
1474 | } |
1475 | ||
dbf37414 RW |
1476 | if (dev->power.syscore) |
1477 | goto Complete; | |
1478 | ||
aae4518b RW |
1479 | if (dev->power.direct_complete) { |
1480 | if (pm_runtime_status_suspended(dev)) { | |
1481 | pm_runtime_disable(dev); | |
019d8817 | 1482 | if (pm_runtime_status_suspended(dev)) |
aae4518b RW |
1483 | goto Complete; |
1484 | ||
1485 | pm_runtime_enable(dev); | |
1486 | } | |
1487 | dev->power.direct_complete = false; | |
1488 | } | |
1489 | ||
70fea60d | 1490 | dpm_watchdog_set(&wd, dev); |
1e2ef05b RW |
1491 | device_lock(dev); |
1492 | ||
564b905a | 1493 | if (dev->pm_domain) { |
9cf519d1 RW |
1494 | info = "power domain "; |
1495 | callback = pm_op(&dev->pm_domain->ops, state); | |
1496 | goto Run; | |
4d27e9dc RW |
1497 | } |
1498 | ||
9659cc06 | 1499 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
1500 | info = "type "; |
1501 | callback = pm_op(dev->type->pm, state); | |
1502 | goto Run; | |
9659cc06 RW |
1503 | } |
1504 | ||
a380f2ed RW |
1505 | if (dev->class && dev->class->pm) { |
1506 | info = "class "; | |
1507 | callback = pm_op(dev->class->pm, state); | |
1508 | goto Run; | |
cd59abfc AS |
1509 | } |
1510 | ||
1eede070 RW |
1511 | if (dev->bus) { |
1512 | if (dev->bus->pm) { | |
35cd133c | 1513 | info = "bus "; |
9cf519d1 | 1514 | callback = pm_op(dev->bus->pm, state); |
1eede070 | 1515 | } else if (dev->bus->suspend) { |
35cd133c | 1516 | pm_dev_dbg(dev, state, "legacy bus "); |
53644677 SK |
1517 | error = legacy_suspend(dev, state, dev->bus->suspend, |
1518 | "legacy bus "); | |
9cf519d1 | 1519 | goto End; |
1eede070 | 1520 | } |
7538e3db RW |
1521 | } |
1522 | ||
9cf519d1 | 1523 | Run: |
35cd133c RW |
1524 | if (!callback && dev->driver && dev->driver->pm) { |
1525 | info = "driver "; | |
1526 | callback = pm_op(dev->driver->pm, state); | |
1527 | } | |
1528 | ||
9cf519d1 RW |
1529 | error = dpm_run_callback(callback, dev, state, info); |
1530 | ||
1eede070 | 1531 | End: |
4ca46ff3 | 1532 | if (!error) { |
aae4518b RW |
1533 | struct device *parent = dev->parent; |
1534 | ||
4ca46ff3 | 1535 | dev->power.is_suspended = true; |
aae4518b RW |
1536 | if (parent) { |
1537 | spin_lock_irq(&parent->power.lock); | |
1538 | ||
1539 | dev->parent->power.direct_complete = false; | |
1540 | if (dev->power.wakeup_path | |
1541 | && !dev->parent->power.ignore_children) | |
1542 | dev->parent->power.wakeup_path = true; | |
1543 | ||
1544 | spin_unlock_irq(&parent->power.lock); | |
1545 | } | |
8c73b428 | 1546 | dpm_clear_suppliers_direct_complete(dev); |
4ca46ff3 | 1547 | } |
6d0e0e84 | 1548 | |
8e9394ce | 1549 | device_unlock(dev); |
70fea60d | 1550 | dpm_watchdog_clear(&wd); |
1f758b23 MSB |
1551 | |
1552 | Complete: | |
88d26136 | 1553 | if (error) |
098dff73 RW |
1554 | async_error = error; |
1555 | ||
05a92622 | 1556 | complete_all(&dev->power.completion); |
431d452a | 1557 | TRACE_SUSPEND(error); |
cd59abfc AS |
1558 | return error; |
1559 | } | |
1560 | ||
5af84b82 RW |
1561 | static void async_suspend(void *data, async_cookie_t cookie) |
1562 | { | |
1563 | struct device *dev = (struct device *)data; | |
1564 | int error; | |
1565 | ||
1566 | error = __device_suspend(dev, pm_transition, true); | |
2a77c46d SL |
1567 | if (error) { |
1568 | dpm_save_failed_dev(dev_name(dev)); | |
5af84b82 | 1569 | pm_dev_err(dev, pm_transition, " async", error); |
2a77c46d | 1570 | } |
5af84b82 RW |
1571 | |
1572 | put_device(dev); | |
1573 | } | |
1574 | ||
1575 | static int device_suspend(struct device *dev) | |
1576 | { | |
16735d02 | 1577 | reinit_completion(&dev->power.completion); |
5af84b82 | 1578 | |
431d452a | 1579 | if (is_async(dev)) { |
5af84b82 RW |
1580 | get_device(dev); |
1581 | async_schedule(async_suspend, dev); | |
1582 | return 0; | |
1583 | } | |
1584 | ||
1585 | return __device_suspend(dev, pm_transition, false); | |
1586 | } | |
1587 | ||
cd59abfc | 1588 | /** |
20d652d7 RW |
1589 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
1590 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1591 | */ |
91e7c75b | 1592 | int dpm_suspend(pm_message_t state) |
cd59abfc | 1593 | { |
ecf762b2 | 1594 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
1595 | int error = 0; |
1596 | ||
bb3632c6 | 1597 | trace_suspend_resume(TPS("dpm_suspend"), state.event, true); |
91e7c75b RW |
1598 | might_sleep(); |
1599 | ||
2f0aea93 VK |
1600 | cpufreq_suspend(); |
1601 | ||
cd59abfc | 1602 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
1603 | pm_transition = state; |
1604 | async_error = 0; | |
8a43a9ab RW |
1605 | while (!list_empty(&dpm_prepared_list)) { |
1606 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 1607 | |
1eede070 | 1608 | get_device(dev); |
cd59abfc | 1609 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 1610 | |
5af84b82 | 1611 | error = device_suspend(dev); |
1eede070 | 1612 | |
1b3cbec1 | 1613 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 1614 | if (error) { |
1eede070 | 1615 | pm_dev_err(dev, state, "", error); |
2a77c46d | 1616 | dpm_save_failed_dev(dev_name(dev)); |
1eede070 | 1617 | put_device(dev); |
775b64d2 RW |
1618 | break; |
1619 | } | |
7a8d37a3 | 1620 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1621 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 1622 | put_device(dev); |
5af84b82 RW |
1623 | if (async_error) |
1624 | break; | |
cd59abfc AS |
1625 | } |
1626 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
1627 | async_synchronize_full(); |
1628 | if (!error) | |
1629 | error = async_error; | |
2a77c46d SL |
1630 | if (error) { |
1631 | suspend_stats.failed_suspend++; | |
1632 | dpm_save_failed_step(SUSPEND_SUSPEND); | |
48059c09 RW |
1633 | } |
1634 | dpm_show_time(starttime, state, error, NULL); | |
bb3632c6 | 1635 | trace_suspend_resume(TPS("dpm_suspend"), state.event, false); |
1eede070 RW |
1636 | return error; |
1637 | } | |
1638 | ||
1639 | /** | |
20d652d7 RW |
1640 | * device_prepare - Prepare a device for system power transition. |
1641 | * @dev: Device to handle. | |
1642 | * @state: PM transition of the system being carried out. | |
1643 | * | |
1644 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
1645 | * device may be registered after this function has returned. | |
1eede070 | 1646 | */ |
d1616302 | 1647 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 | 1648 | { |
35cd133c | 1649 | int (*callback)(struct device *) = NULL; |
aae4518b | 1650 | int ret = 0; |
1eede070 | 1651 | |
dbf37414 RW |
1652 | if (dev->power.syscore) |
1653 | return 0; | |
1654 | ||
88d26136 AS |
1655 | /* |
1656 | * If a device's parent goes into runtime suspend at the wrong time, | |
1657 | * it won't be possible to resume the device. To prevent this we | |
1658 | * block runtime suspend here, during the prepare phase, and allow | |
1659 | * it again during the complete phase. | |
1660 | */ | |
1661 | pm_runtime_get_noresume(dev); | |
1662 | ||
8e9394ce | 1663 | device_lock(dev); |
1eede070 | 1664 | |
4ca46ff3 RW |
1665 | dev->power.wakeup_path = device_may_wakeup(dev); |
1666 | ||
aa8e54b5 TV |
1667 | if (dev->power.no_pm_callbacks) { |
1668 | ret = 1; /* Let device go direct_complete */ | |
1669 | goto unlock; | |
1670 | } | |
1671 | ||
fba1fbf5 | 1672 | if (dev->pm_domain) |
35cd133c | 1673 | callback = dev->pm_domain->ops.prepare; |
fba1fbf5 | 1674 | else if (dev->type && dev->type->pm) |
35cd133c | 1675 | callback = dev->type->pm->prepare; |
fba1fbf5 | 1676 | else if (dev->class && dev->class->pm) |
35cd133c | 1677 | callback = dev->class->pm->prepare; |
fba1fbf5 | 1678 | else if (dev->bus && dev->bus->pm) |
35cd133c | 1679 | callback = dev->bus->pm->prepare; |
35cd133c | 1680 | |
fba1fbf5 | 1681 | if (!callback && dev->driver && dev->driver->pm) |
35cd133c | 1682 | callback = dev->driver->pm->prepare; |
35cd133c | 1683 | |
32e8d689 | 1684 | if (callback) |
aae4518b | 1685 | ret = callback(dev); |
7538e3db | 1686 | |
aa8e54b5 | 1687 | unlock: |
8e9394ce | 1688 | device_unlock(dev); |
1eede070 | 1689 | |
aae4518b RW |
1690 | if (ret < 0) { |
1691 | suspend_report_result(callback, ret); | |
aa1b9f13 | 1692 | pm_runtime_put(dev); |
aae4518b RW |
1693 | return ret; |
1694 | } | |
1695 | /* | |
1696 | * A positive return value from ->prepare() means "this device appears | |
1697 | * to be runtime-suspended and its state is fine, so if it really is | |
1698 | * runtime-suspended, you can leave it in that state provided that you | |
1699 | * will do the same thing with all of its descendants". This only | |
1700 | * applies to suspend transitions, however. | |
1701 | */ | |
1702 | spin_lock_irq(&dev->power.lock); | |
1703 | dev->power.direct_complete = ret > 0 && state.event == PM_EVENT_SUSPEND; | |
1704 | spin_unlock_irq(&dev->power.lock); | |
1705 | return 0; | |
1eede070 | 1706 | } |
cd59abfc | 1707 | |
1eede070 | 1708 | /** |
20d652d7 RW |
1709 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1710 | * @state: PM transition of the system being carried out. | |
1eede070 | 1711 | * |
20d652d7 | 1712 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 | 1713 | */ |
91e7c75b | 1714 | int dpm_prepare(pm_message_t state) |
1eede070 | 1715 | { |
1eede070 RW |
1716 | int error = 0; |
1717 | ||
bb3632c6 | 1718 | trace_suspend_resume(TPS("dpm_prepare"), state.event, true); |
91e7c75b RW |
1719 | might_sleep(); |
1720 | ||
013c074f SG |
1721 | /* |
1722 | * Give a chance for the known devices to complete their probes, before | |
1723 | * disable probing of devices. This sync point is important at least | |
1724 | * at boot time + hibernation restore. | |
1725 | */ | |
1726 | wait_for_device_probe(); | |
1727 | /* | |
1728 | * It is unsafe if probing of devices will happen during suspend or | |
1729 | * hibernation and system behavior will be unpredictable in this case. | |
1730 | * So, let's prohibit device's probing here and defer their probes | |
1731 | * instead. The normal behavior will be restored in dpm_complete(). | |
1732 | */ | |
1733 | device_block_probing(); | |
1734 | ||
1eede070 | 1735 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
1736 | while (!list_empty(&dpm_list)) { |
1737 | struct device *dev = to_device(dpm_list.next); | |
1738 | ||
1739 | get_device(dev); | |
1eede070 RW |
1740 | mutex_unlock(&dpm_list_mtx); |
1741 | ||
32e8d689 | 1742 | trace_device_pm_callback_start(dev, "", state.event); |
1e2ef05b | 1743 | error = device_prepare(dev, state); |
32e8d689 | 1744 | trace_device_pm_callback_end(dev, error); |
1eede070 RW |
1745 | |
1746 | mutex_lock(&dpm_list_mtx); | |
1747 | if (error) { | |
1eede070 RW |
1748 | if (error == -EAGAIN) { |
1749 | put_device(dev); | |
886a7a33 | 1750 | error = 0; |
1eede070 RW |
1751 | continue; |
1752 | } | |
1e75227e RW |
1753 | printk(KERN_INFO "PM: Device %s not prepared " |
1754 | "for power transition: code %d\n", | |
5c1a07ab | 1755 | dev_name(dev), error); |
1eede070 RW |
1756 | put_device(dev); |
1757 | break; | |
1758 | } | |
f76b168b | 1759 | dev->power.is_prepared = true; |
1eede070 | 1760 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1761 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1762 | put_device(dev); |
1763 | } | |
1eede070 | 1764 | mutex_unlock(&dpm_list_mtx); |
bb3632c6 | 1765 | trace_suspend_resume(TPS("dpm_prepare"), state.event, false); |
cd59abfc AS |
1766 | return error; |
1767 | } | |
1768 | ||
775b64d2 | 1769 | /** |
20d652d7 RW |
1770 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1771 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1772 | * |
20d652d7 RW |
1773 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1774 | * callbacks for them. | |
775b64d2 | 1775 | */ |
d1616302 | 1776 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1777 | { |
1778 | int error; | |
cd59abfc | 1779 | |
1eede070 | 1780 | error = dpm_prepare(state); |
2a77c46d SL |
1781 | if (error) { |
1782 | suspend_stats.failed_prepare++; | |
1783 | dpm_save_failed_step(SUSPEND_PREPARE); | |
1784 | } else | |
1eede070 | 1785 | error = dpm_suspend(state); |
cd59abfc | 1786 | return error; |
cd59abfc | 1787 | } |
d1616302 | 1788 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1789 | |
1790 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1791 | { | |
c80cfb04 BH |
1792 | if (ret) |
1793 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1794 | } |
1795 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1796 | |
1797 | /** | |
1798 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1799 | * @dev: Device to wait for. | |
1800 | * @subordinate: Device that needs to wait for @dev. | |
1801 | */ | |
098dff73 | 1802 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1803 | { |
1804 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1805 | return async_error; |
f8824cee RW |
1806 | } |
1807 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); | |
dfe3212e ML |
1808 | |
1809 | /** | |
1810 | * dpm_for_each_dev - device iterator. | |
1811 | * @data: data for the callback. | |
1812 | * @fn: function to be called for each device. | |
1813 | * | |
1814 | * Iterate over devices in dpm_list, and call @fn for each device, | |
1815 | * passing it @data. | |
1816 | */ | |
1817 | void dpm_for_each_dev(void *data, void (*fn)(struct device *, void *)) | |
1818 | { | |
1819 | struct device *dev; | |
1820 | ||
1821 | if (!fn) | |
1822 | return; | |
1823 | ||
1824 | device_pm_lock(); | |
1825 | list_for_each_entry(dev, &dpm_list, power.entry) | |
1826 | fn(dev, data); | |
1827 | device_pm_unlock(); | |
1828 | } | |
1829 | EXPORT_SYMBOL_GPL(dpm_for_each_dev); | |
aa8e54b5 TV |
1830 | |
1831 | static bool pm_ops_is_empty(const struct dev_pm_ops *ops) | |
1832 | { | |
1833 | if (!ops) | |
1834 | return true; | |
1835 | ||
1836 | return !ops->prepare && | |
1837 | !ops->suspend && | |
1838 | !ops->suspend_late && | |
1839 | !ops->suspend_noirq && | |
1840 | !ops->resume_noirq && | |
1841 | !ops->resume_early && | |
1842 | !ops->resume && | |
1843 | !ops->complete; | |
1844 | } | |
1845 | ||
1846 | void device_pm_check_callbacks(struct device *dev) | |
1847 | { | |
1848 | spin_lock_irq(&dev->power.lock); | |
1849 | dev->power.no_pm_callbacks = | |
157c460e RW |
1850 | (!dev->bus || (pm_ops_is_empty(dev->bus->pm) && |
1851 | !dev->bus->suspend && !dev->bus->resume)) && | |
a380f2ed | 1852 | (!dev->class || pm_ops_is_empty(dev->class->pm)) && |
aa8e54b5 TV |
1853 | (!dev->type || pm_ops_is_empty(dev->type->pm)) && |
1854 | (!dev->pm_domain || pm_ops_is_empty(&dev->pm_domain->ops)) && | |
157c460e RW |
1855 | (!dev->driver || (pm_ops_is_empty(dev->driver->pm) && |
1856 | !dev->driver->suspend && !dev->driver->resume)); | |
aa8e54b5 TV |
1857 | spin_unlock_irq(&dev->power.lock); |
1858 | } |