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> |
cd59abfc | 26 | #include <linux/resume-trace.h> |
2ed8d2b3 | 27 | #include <linux/interrupt.h> |
f2511774 | 28 | #include <linux/sched.h> |
5af84b82 | 29 | #include <linux/async.h> |
1e75227e | 30 | #include <linux/suspend.h> |
8651f97b | 31 | #include <linux/cpuidle.h> |
cd59abfc | 32 | #include "../base.h" |
1da177e4 LT |
33 | #include "power.h" |
34 | ||
9cf519d1 RW |
35 | typedef int (*pm_callback_t)(struct device *); |
36 | ||
775b64d2 | 37 | /* |
1eede070 | 38 | * The entries in the dpm_list list are in a depth first order, simply |
775b64d2 RW |
39 | * because children are guaranteed to be discovered after parents, and |
40 | * are inserted at the back of the list on discovery. | |
41 | * | |
8e9394ce GKH |
42 | * Since device_pm_add() may be called with a device lock held, |
43 | * we must never try to acquire a device lock while holding | |
775b64d2 RW |
44 | * dpm_list_mutex. |
45 | */ | |
46 | ||
1eede070 | 47 | LIST_HEAD(dpm_list); |
7664e969 SK |
48 | static LIST_HEAD(dpm_prepared_list); |
49 | static LIST_HEAD(dpm_suspended_list); | |
50 | static LIST_HEAD(dpm_late_early_list); | |
51 | static LIST_HEAD(dpm_noirq_list); | |
1da177e4 | 52 | |
2a77c46d | 53 | struct suspend_stats suspend_stats; |
cd59abfc | 54 | static DEFINE_MUTEX(dpm_list_mtx); |
5af84b82 | 55 | static pm_message_t pm_transition; |
1da177e4 | 56 | |
098dff73 RW |
57 | static int async_error; |
58 | ||
5e928f77 | 59 | /** |
e91c11b1 | 60 | * device_pm_sleep_init - Initialize system suspend-related device fields. |
5e928f77 RW |
61 | * @dev: Device object being initialized. |
62 | */ | |
e91c11b1 | 63 | void device_pm_sleep_init(struct device *dev) |
5e928f77 | 64 | { |
f76b168b | 65 | dev->power.is_prepared = false; |
6d0e0e84 | 66 | dev->power.is_suspended = false; |
5af84b82 | 67 | init_completion(&dev->power.completion); |
152e1d59 | 68 | complete_all(&dev->power.completion); |
074037ec | 69 | dev->power.wakeup = NULL; |
22110faf | 70 | INIT_LIST_HEAD(&dev->power.entry); |
5e928f77 RW |
71 | } |
72 | ||
1eede070 | 73 | /** |
20d652d7 | 74 | * device_pm_lock - Lock the list of active devices used by the PM core. |
1eede070 RW |
75 | */ |
76 | void device_pm_lock(void) | |
77 | { | |
78 | mutex_lock(&dpm_list_mtx); | |
79 | } | |
80 | ||
81 | /** | |
20d652d7 | 82 | * device_pm_unlock - Unlock the list of active devices used by the PM core. |
1eede070 RW |
83 | */ |
84 | void device_pm_unlock(void) | |
85 | { | |
86 | mutex_unlock(&dpm_list_mtx); | |
87 | } | |
075c1771 | 88 | |
775b64d2 | 89 | /** |
20d652d7 RW |
90 | * device_pm_add - Add a device to the PM core's list of active devices. |
91 | * @dev: Device to add to the list. | |
775b64d2 | 92 | */ |
3b98aeaf | 93 | void device_pm_add(struct device *dev) |
1da177e4 | 94 | { |
1da177e4 | 95 | pr_debug("PM: Adding info for %s:%s\n", |
5c1a07ab | 96 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
11048dcf | 97 | mutex_lock(&dpm_list_mtx); |
f76b168b | 98 | if (dev->parent && dev->parent->power.is_prepared) |
b64959e6 RW |
99 | dev_warn(dev, "parent %s should not be sleeping\n", |
100 | dev_name(dev->parent)); | |
3b98aeaf | 101 | list_add_tail(&dev->power.entry, &dpm_list); |
91ff4cb8 | 102 | dev_pm_qos_constraints_init(dev); |
1a9a9152 | 103 | mutex_unlock(&dpm_list_mtx); |
1da177e4 LT |
104 | } |
105 | ||
775b64d2 | 106 | /** |
20d652d7 RW |
107 | * device_pm_remove - Remove a device from the PM core's list of active devices. |
108 | * @dev: Device to be removed from the list. | |
775b64d2 | 109 | */ |
9cddad77 | 110 | void device_pm_remove(struct device *dev) |
1da177e4 LT |
111 | { |
112 | pr_debug("PM: Removing info for %s:%s\n", | |
5c1a07ab | 113 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
5af84b82 | 114 | complete_all(&dev->power.completion); |
11048dcf | 115 | mutex_lock(&dpm_list_mtx); |
1a9a9152 | 116 | dev_pm_qos_constraints_destroy(dev); |
1da177e4 | 117 | list_del_init(&dev->power.entry); |
11048dcf | 118 | mutex_unlock(&dpm_list_mtx); |
074037ec | 119 | device_wakeup_disable(dev); |
5e928f77 | 120 | pm_runtime_remove(dev); |
775b64d2 RW |
121 | } |
122 | ||
ffa6a705 | 123 | /** |
20d652d7 RW |
124 | * device_pm_move_before - Move device in the PM core's list of active devices. |
125 | * @deva: Device to move in dpm_list. | |
126 | * @devb: Device @deva should come before. | |
ffa6a705 CH |
127 | */ |
128 | void device_pm_move_before(struct device *deva, struct device *devb) | |
129 | { | |
130 | pr_debug("PM: Moving %s:%s before %s:%s\n", | |
5c1a07ab RW |
131 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
132 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
133 | /* Delete deva from dpm_list and reinsert before devb. */ |
134 | list_move_tail(&deva->power.entry, &devb->power.entry); | |
135 | } | |
136 | ||
137 | /** | |
20d652d7 RW |
138 | * device_pm_move_after - Move device in the PM core's list of active devices. |
139 | * @deva: Device to move in dpm_list. | |
140 | * @devb: Device @deva should come after. | |
ffa6a705 CH |
141 | */ |
142 | void device_pm_move_after(struct device *deva, struct device *devb) | |
143 | { | |
144 | pr_debug("PM: Moving %s:%s after %s:%s\n", | |
5c1a07ab RW |
145 | deva->bus ? deva->bus->name : "No Bus", dev_name(deva), |
146 | devb->bus ? devb->bus->name : "No Bus", dev_name(devb)); | |
ffa6a705 CH |
147 | /* Delete deva from dpm_list and reinsert after devb. */ |
148 | list_move(&deva->power.entry, &devb->power.entry); | |
149 | } | |
150 | ||
151 | /** | |
20d652d7 RW |
152 | * device_pm_move_last - Move device to end of the PM core's list of devices. |
153 | * @dev: Device to move in dpm_list. | |
ffa6a705 CH |
154 | */ |
155 | void device_pm_move_last(struct device *dev) | |
156 | { | |
157 | pr_debug("PM: Moving %s:%s to end of list\n", | |
5c1a07ab | 158 | dev->bus ? dev->bus->name : "No Bus", dev_name(dev)); |
ffa6a705 CH |
159 | list_move_tail(&dev->power.entry, &dpm_list); |
160 | } | |
161 | ||
875ab0b7 RW |
162 | static ktime_t initcall_debug_start(struct device *dev) |
163 | { | |
164 | ktime_t calltime = ktime_set(0, 0); | |
165 | ||
b2df1d4f | 166 | if (pm_print_times_enabled) { |
0c6aebe3 RW |
167 | pr_info("calling %s+ @ %i, parent: %s\n", |
168 | dev_name(dev), task_pid_nr(current), | |
169 | dev->parent ? dev_name(dev->parent) : "none"); | |
875ab0b7 RW |
170 | calltime = ktime_get(); |
171 | } | |
172 | ||
173 | return calltime; | |
174 | } | |
175 | ||
176 | static void initcall_debug_report(struct device *dev, ktime_t calltime, | |
177 | int error) | |
178 | { | |
179 | ktime_t delta, rettime; | |
180 | ||
b2df1d4f | 181 | if (pm_print_times_enabled) { |
875ab0b7 RW |
182 | rettime = ktime_get(); |
183 | delta = ktime_sub(rettime, calltime); | |
184 | pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev), | |
185 | error, (unsigned long long)ktime_to_ns(delta) >> 10); | |
186 | } | |
187 | } | |
188 | ||
5af84b82 RW |
189 | /** |
190 | * dpm_wait - Wait for a PM operation to complete. | |
191 | * @dev: Device to wait for. | |
192 | * @async: If unset, wait only if the device's power.async_suspend flag is set. | |
193 | */ | |
194 | static void dpm_wait(struct device *dev, bool async) | |
195 | { | |
196 | if (!dev) | |
197 | return; | |
198 | ||
0e06b4a8 | 199 | if (async || (pm_async_enabled && dev->power.async_suspend)) |
5af84b82 RW |
200 | wait_for_completion(&dev->power.completion); |
201 | } | |
202 | ||
203 | static int dpm_wait_fn(struct device *dev, void *async_ptr) | |
204 | { | |
205 | dpm_wait(dev, *((bool *)async_ptr)); | |
206 | return 0; | |
207 | } | |
208 | ||
209 | static void dpm_wait_for_children(struct device *dev, bool async) | |
210 | { | |
211 | device_for_each_child(dev, &async, dpm_wait_fn); | |
212 | } | |
213 | ||
1eede070 | 214 | /** |
9cf519d1 | 215 | * pm_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
216 | * @ops: PM operations to choose from. |
217 | * @state: PM transition of the system being carried out. | |
1eede070 | 218 | */ |
9cf519d1 | 219 | static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 220 | { |
1eede070 RW |
221 | switch (state.event) { |
222 | #ifdef CONFIG_SUSPEND | |
223 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 224 | return ops->suspend; |
1eede070 | 225 | case PM_EVENT_RESUME: |
9cf519d1 | 226 | return ops->resume; |
1eede070 | 227 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 228 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
229 | case PM_EVENT_FREEZE: |
230 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 231 | return ops->freeze; |
1eede070 | 232 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 233 | return ops->poweroff; |
1eede070 RW |
234 | case PM_EVENT_THAW: |
235 | case PM_EVENT_RECOVER: | |
9cf519d1 | 236 | return ops->thaw; |
1eede070 RW |
237 | break; |
238 | case PM_EVENT_RESTORE: | |
9cf519d1 | 239 | return ops->restore; |
1f112cee | 240 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 241 | } |
f2511774 | 242 | |
9cf519d1 | 243 | return NULL; |
1eede070 RW |
244 | } |
245 | ||
cf579dfb RW |
246 | /** |
247 | * pm_late_early_op - Return the PM operation appropriate for given PM event. | |
248 | * @ops: PM operations to choose from. | |
249 | * @state: PM transition of the system being carried out. | |
250 | * | |
251 | * Runtime PM is disabled for @dev while this function is being executed. | |
252 | */ | |
253 | static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops, | |
254 | pm_message_t state) | |
255 | { | |
256 | switch (state.event) { | |
257 | #ifdef CONFIG_SUSPEND | |
258 | case PM_EVENT_SUSPEND: | |
259 | return ops->suspend_late; | |
260 | case PM_EVENT_RESUME: | |
261 | return ops->resume_early; | |
262 | #endif /* CONFIG_SUSPEND */ | |
263 | #ifdef CONFIG_HIBERNATE_CALLBACKS | |
264 | case PM_EVENT_FREEZE: | |
265 | case PM_EVENT_QUIESCE: | |
266 | return ops->freeze_late; | |
267 | case PM_EVENT_HIBERNATE: | |
268 | return ops->poweroff_late; | |
269 | case PM_EVENT_THAW: | |
270 | case PM_EVENT_RECOVER: | |
271 | return ops->thaw_early; | |
272 | case PM_EVENT_RESTORE: | |
273 | return ops->restore_early; | |
274 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ | |
275 | } | |
276 | ||
277 | return NULL; | |
278 | } | |
279 | ||
1eede070 | 280 | /** |
9cf519d1 | 281 | * pm_noirq_op - Return the PM operation appropriate for given PM event. |
20d652d7 RW |
282 | * @ops: PM operations to choose from. |
283 | * @state: PM transition of the system being carried out. | |
1eede070 | 284 | * |
20d652d7 RW |
285 | * The driver of @dev will not receive interrupts while this function is being |
286 | * executed. | |
1eede070 | 287 | */ |
9cf519d1 | 288 | static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state) |
1eede070 | 289 | { |
1eede070 RW |
290 | switch (state.event) { |
291 | #ifdef CONFIG_SUSPEND | |
292 | case PM_EVENT_SUSPEND: | |
9cf519d1 | 293 | return ops->suspend_noirq; |
1eede070 | 294 | case PM_EVENT_RESUME: |
9cf519d1 | 295 | return ops->resume_noirq; |
1eede070 | 296 | #endif /* CONFIG_SUSPEND */ |
1f112cee | 297 | #ifdef CONFIG_HIBERNATE_CALLBACKS |
1eede070 RW |
298 | case PM_EVENT_FREEZE: |
299 | case PM_EVENT_QUIESCE: | |
9cf519d1 | 300 | return ops->freeze_noirq; |
1eede070 | 301 | case PM_EVENT_HIBERNATE: |
9cf519d1 | 302 | return ops->poweroff_noirq; |
1eede070 RW |
303 | case PM_EVENT_THAW: |
304 | case PM_EVENT_RECOVER: | |
9cf519d1 | 305 | return ops->thaw_noirq; |
1eede070 | 306 | case PM_EVENT_RESTORE: |
9cf519d1 | 307 | return ops->restore_noirq; |
1f112cee | 308 | #endif /* CONFIG_HIBERNATE_CALLBACKS */ |
1eede070 | 309 | } |
f2511774 | 310 | |
9cf519d1 | 311 | return NULL; |
1eede070 RW |
312 | } |
313 | ||
314 | static char *pm_verb(int event) | |
315 | { | |
316 | switch (event) { | |
317 | case PM_EVENT_SUSPEND: | |
318 | return "suspend"; | |
319 | case PM_EVENT_RESUME: | |
320 | return "resume"; | |
321 | case PM_EVENT_FREEZE: | |
322 | return "freeze"; | |
323 | case PM_EVENT_QUIESCE: | |
324 | return "quiesce"; | |
325 | case PM_EVENT_HIBERNATE: | |
326 | return "hibernate"; | |
327 | case PM_EVENT_THAW: | |
328 | return "thaw"; | |
329 | case PM_EVENT_RESTORE: | |
330 | return "restore"; | |
331 | case PM_EVENT_RECOVER: | |
332 | return "recover"; | |
333 | default: | |
334 | return "(unknown PM event)"; | |
335 | } | |
336 | } | |
337 | ||
338 | static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info) | |
339 | { | |
340 | dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event), | |
341 | ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ? | |
342 | ", may wakeup" : ""); | |
343 | } | |
344 | ||
345 | static void pm_dev_err(struct device *dev, pm_message_t state, char *info, | |
346 | int error) | |
347 | { | |
348 | printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n", | |
5c1a07ab | 349 | dev_name(dev), pm_verb(state.event), info, error); |
1eede070 RW |
350 | } |
351 | ||
ecf762b2 RW |
352 | static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info) |
353 | { | |
354 | ktime_t calltime; | |
0702d9ee | 355 | u64 usecs64; |
ecf762b2 RW |
356 | int usecs; |
357 | ||
358 | calltime = ktime_get(); | |
359 | usecs64 = ktime_to_ns(ktime_sub(calltime, starttime)); | |
360 | do_div(usecs64, NSEC_PER_USEC); | |
361 | usecs = usecs64; | |
362 | if (usecs == 0) | |
363 | usecs = 1; | |
364 | pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n", | |
365 | info ?: "", info ? " " : "", pm_verb(state.event), | |
366 | usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC); | |
367 | } | |
368 | ||
9cf519d1 RW |
369 | static int dpm_run_callback(pm_callback_t cb, struct device *dev, |
370 | pm_message_t state, char *info) | |
371 | { | |
372 | ktime_t calltime; | |
373 | int error; | |
374 | ||
375 | if (!cb) | |
376 | return 0; | |
377 | ||
378 | calltime = initcall_debug_start(dev); | |
379 | ||
380 | pm_dev_dbg(dev, state, info); | |
381 | error = cb(dev); | |
382 | suspend_report_result(cb, error); | |
383 | ||
384 | initcall_debug_report(dev, calltime, error); | |
385 | ||
386 | return error; | |
387 | } | |
388 | ||
cd59abfc AS |
389 | /*------------------------- Resume routines -------------------------*/ |
390 | ||
391 | /** | |
20d652d7 RW |
392 | * device_resume_noirq - Execute an "early resume" callback for given device. |
393 | * @dev: Device to handle. | |
394 | * @state: PM transition of the system being carried out. | |
cd59abfc | 395 | * |
20d652d7 RW |
396 | * The driver of @dev will not receive interrupts while this function is being |
397 | * executed. | |
cd59abfc | 398 | */ |
d1616302 | 399 | static int device_resume_noirq(struct device *dev, pm_message_t state) |
cd59abfc | 400 | { |
9cf519d1 RW |
401 | pm_callback_t callback = NULL; |
402 | char *info = NULL; | |
cd59abfc AS |
403 | int error = 0; |
404 | ||
405 | TRACE_DEVICE(dev); | |
406 | TRACE_RESUME(0); | |
407 | ||
dbf37414 RW |
408 | if (dev->power.syscore) |
409 | goto Out; | |
410 | ||
564b905a | 411 | if (dev->pm_domain) { |
cf579dfb | 412 | info = "noirq power domain "; |
9cf519d1 | 413 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 414 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 415 | info = "noirq type "; |
9cf519d1 | 416 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 417 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 418 | info = "noirq class "; |
9cf519d1 | 419 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 420 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 421 | info = "noirq bus "; |
9cf519d1 | 422 | callback = pm_noirq_op(dev->bus->pm, state); |
e7176a37 DB |
423 | } |
424 | ||
35cd133c | 425 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 426 | info = "noirq driver "; |
35cd133c RW |
427 | callback = pm_noirq_op(dev->driver->pm, state); |
428 | } | |
429 | ||
9cf519d1 RW |
430 | error = dpm_run_callback(callback, dev, state, info); |
431 | ||
dbf37414 | 432 | Out: |
775b64d2 RW |
433 | TRACE_RESUME(error); |
434 | return error; | |
435 | } | |
436 | ||
437 | /** | |
cf579dfb | 438 | * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices. |
20d652d7 | 439 | * @state: PM transition of the system being carried out. |
775b64d2 | 440 | * |
cf579dfb | 441 | * Call the "noirq" resume handlers for all devices in dpm_noirq_list and |
20d652d7 | 442 | * enable device drivers to receive interrupts. |
775b64d2 | 443 | */ |
cf579dfb | 444 | static void dpm_resume_noirq(pm_message_t state) |
775b64d2 | 445 | { |
ecf762b2 | 446 | ktime_t starttime = ktime_get(); |
775b64d2 | 447 | |
32bdfac5 | 448 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
449 | while (!list_empty(&dpm_noirq_list)) { |
450 | struct device *dev = to_device(dpm_noirq_list.next); | |
5b219a51 | 451 | int error; |
d08a5ace RW |
452 | |
453 | get_device(dev); | |
cf579dfb | 454 | list_move_tail(&dev->power.entry, &dpm_late_early_list); |
5b219a51 | 455 | mutex_unlock(&dpm_list_mtx); |
d08a5ace | 456 | |
5b219a51 | 457 | error = device_resume_noirq(dev, state); |
2a77c46d SL |
458 | if (error) { |
459 | suspend_stats.failed_resume_noirq++; | |
460 | dpm_save_failed_step(SUSPEND_RESUME_NOIRQ); | |
461 | dpm_save_failed_dev(dev_name(dev)); | |
cf579dfb RW |
462 | pm_dev_err(dev, state, " noirq", error); |
463 | } | |
464 | ||
465 | mutex_lock(&dpm_list_mtx); | |
466 | put_device(dev); | |
467 | } | |
468 | mutex_unlock(&dpm_list_mtx); | |
469 | dpm_show_time(starttime, state, "noirq"); | |
470 | resume_device_irqs(); | |
8651f97b | 471 | cpuidle_resume(); |
cf579dfb RW |
472 | } |
473 | ||
474 | /** | |
475 | * device_resume_early - Execute an "early resume" callback for given device. | |
476 | * @dev: Device to handle. | |
477 | * @state: PM transition of the system being carried out. | |
478 | * | |
479 | * Runtime PM is disabled for @dev while this function is being executed. | |
480 | */ | |
481 | static int device_resume_early(struct device *dev, pm_message_t state) | |
482 | { | |
483 | pm_callback_t callback = NULL; | |
484 | char *info = NULL; | |
485 | int error = 0; | |
486 | ||
487 | TRACE_DEVICE(dev); | |
488 | TRACE_RESUME(0); | |
489 | ||
dbf37414 RW |
490 | if (dev->power.syscore) |
491 | goto Out; | |
492 | ||
cf579dfb RW |
493 | if (dev->pm_domain) { |
494 | info = "early power domain "; | |
495 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
496 | } else if (dev->type && dev->type->pm) { | |
497 | info = "early type "; | |
498 | callback = pm_late_early_op(dev->type->pm, state); | |
499 | } else if (dev->class && dev->class->pm) { | |
500 | info = "early class "; | |
501 | callback = pm_late_early_op(dev->class->pm, state); | |
502 | } else if (dev->bus && dev->bus->pm) { | |
503 | info = "early bus "; | |
504 | callback = pm_late_early_op(dev->bus->pm, state); | |
505 | } | |
506 | ||
507 | if (!callback && dev->driver && dev->driver->pm) { | |
508 | info = "early driver "; | |
509 | callback = pm_late_early_op(dev->driver->pm, state); | |
510 | } | |
511 | ||
512 | error = dpm_run_callback(callback, dev, state, info); | |
513 | ||
dbf37414 | 514 | Out: |
cf579dfb RW |
515 | TRACE_RESUME(error); |
516 | return error; | |
517 | } | |
518 | ||
519 | /** | |
520 | * dpm_resume_early - Execute "early resume" callbacks for all devices. | |
521 | * @state: PM transition of the system being carried out. | |
522 | */ | |
523 | static void dpm_resume_early(pm_message_t state) | |
524 | { | |
525 | ktime_t starttime = ktime_get(); | |
526 | ||
527 | mutex_lock(&dpm_list_mtx); | |
528 | while (!list_empty(&dpm_late_early_list)) { | |
529 | struct device *dev = to_device(dpm_late_early_list.next); | |
530 | int error; | |
531 | ||
532 | get_device(dev); | |
533 | list_move_tail(&dev->power.entry, &dpm_suspended_list); | |
534 | mutex_unlock(&dpm_list_mtx); | |
535 | ||
536 | error = device_resume_early(dev, state); | |
537 | if (error) { | |
538 | suspend_stats.failed_resume_early++; | |
539 | dpm_save_failed_step(SUSPEND_RESUME_EARLY); | |
540 | dpm_save_failed_dev(dev_name(dev)); | |
5b219a51 | 541 | pm_dev_err(dev, state, " early", error); |
2a77c46d | 542 | } |
d08a5ace | 543 | |
5b219a51 | 544 | mutex_lock(&dpm_list_mtx); |
d08a5ace RW |
545 | put_device(dev); |
546 | } | |
32bdfac5 | 547 | mutex_unlock(&dpm_list_mtx); |
ecf762b2 | 548 | dpm_show_time(starttime, state, "early"); |
775b64d2 | 549 | } |
cf579dfb RW |
550 | |
551 | /** | |
552 | * dpm_resume_start - Execute "noirq" and "early" device callbacks. | |
553 | * @state: PM transition of the system being carried out. | |
554 | */ | |
555 | void dpm_resume_start(pm_message_t state) | |
556 | { | |
557 | dpm_resume_noirq(state); | |
558 | dpm_resume_early(state); | |
559 | } | |
560 | EXPORT_SYMBOL_GPL(dpm_resume_start); | |
775b64d2 RW |
561 | |
562 | /** | |
97df8c12 | 563 | * device_resume - Execute "resume" callbacks for given device. |
20d652d7 RW |
564 | * @dev: Device to handle. |
565 | * @state: PM transition of the system being carried out. | |
5af84b82 | 566 | * @async: If true, the device is being resumed asynchronously. |
775b64d2 | 567 | */ |
97df8c12 | 568 | static int device_resume(struct device *dev, pm_message_t state, bool async) |
775b64d2 | 569 | { |
9cf519d1 RW |
570 | pm_callback_t callback = NULL; |
571 | char *info = NULL; | |
775b64d2 RW |
572 | int error = 0; |
573 | ||
574 | TRACE_DEVICE(dev); | |
575 | TRACE_RESUME(0); | |
cd59abfc | 576 | |
dbf37414 RW |
577 | if (dev->power.syscore) |
578 | goto Complete; | |
579 | ||
5af84b82 | 580 | dpm_wait(dev->parent, async); |
8e9394ce | 581 | device_lock(dev); |
7a8d37a3 | 582 | |
f76b168b AS |
583 | /* |
584 | * This is a fib. But we'll allow new children to be added below | |
585 | * a resumed device, even if the device hasn't been completed yet. | |
586 | */ | |
587 | dev->power.is_prepared = false; | |
97df8c12 | 588 | |
6d0e0e84 AS |
589 | if (!dev->power.is_suspended) |
590 | goto Unlock; | |
591 | ||
1e2ef05b | 592 | pm_runtime_enable(dev); |
1e2ef05b | 593 | |
564b905a | 594 | if (dev->pm_domain) { |
9cf519d1 RW |
595 | info = "power domain "; |
596 | callback = pm_op(&dev->pm_domain->ops, state); | |
35cd133c | 597 | goto Driver; |
7538e3db RW |
598 | } |
599 | ||
9659cc06 | 600 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
601 | info = "type "; |
602 | callback = pm_op(dev->type->pm, state); | |
35cd133c | 603 | goto Driver; |
cd59abfc AS |
604 | } |
605 | ||
1eede070 RW |
606 | if (dev->class) { |
607 | if (dev->class->pm) { | |
9cf519d1 RW |
608 | info = "class "; |
609 | callback = pm_op(dev->class->pm, state); | |
35cd133c | 610 | goto Driver; |
1eede070 | 611 | } else if (dev->class->resume) { |
9cf519d1 RW |
612 | info = "legacy class "; |
613 | callback = dev->class->resume; | |
9659cc06 | 614 | goto End; |
1eede070 | 615 | } |
cd59abfc | 616 | } |
9659cc06 RW |
617 | |
618 | if (dev->bus) { | |
619 | if (dev->bus->pm) { | |
35cd133c | 620 | info = "bus "; |
9cf519d1 | 621 | callback = pm_op(dev->bus->pm, state); |
9659cc06 | 622 | } else if (dev->bus->resume) { |
35cd133c | 623 | info = "legacy bus "; |
9cf519d1 | 624 | callback = dev->bus->resume; |
35cd133c | 625 | goto End; |
9659cc06 RW |
626 | } |
627 | } | |
628 | ||
35cd133c RW |
629 | Driver: |
630 | if (!callback && dev->driver && dev->driver->pm) { | |
631 | info = "driver "; | |
632 | callback = pm_op(dev->driver->pm, state); | |
633 | } | |
634 | ||
1eede070 | 635 | End: |
9cf519d1 | 636 | error = dpm_run_callback(callback, dev, state, info); |
6d0e0e84 AS |
637 | dev->power.is_suspended = false; |
638 | ||
639 | Unlock: | |
8e9394ce | 640 | device_unlock(dev); |
dbf37414 RW |
641 | |
642 | Complete: | |
5af84b82 | 643 | complete_all(&dev->power.completion); |
7a8d37a3 | 644 | |
cd59abfc | 645 | TRACE_RESUME(error); |
1e2ef05b | 646 | |
cd59abfc AS |
647 | return error; |
648 | } | |
649 | ||
5af84b82 RW |
650 | static void async_resume(void *data, async_cookie_t cookie) |
651 | { | |
652 | struct device *dev = (struct device *)data; | |
653 | int error; | |
654 | ||
97df8c12 | 655 | error = device_resume(dev, pm_transition, true); |
5af84b82 RW |
656 | if (error) |
657 | pm_dev_err(dev, pm_transition, " async", error); | |
658 | put_device(dev); | |
659 | } | |
660 | ||
97df8c12 | 661 | static bool is_async(struct device *dev) |
5af84b82 | 662 | { |
97df8c12 RW |
663 | return dev->power.async_suspend && pm_async_enabled |
664 | && !pm_trace_is_enabled(); | |
5af84b82 RW |
665 | } |
666 | ||
775b64d2 | 667 | /** |
20d652d7 RW |
668 | * dpm_resume - Execute "resume" callbacks for non-sysdev devices. |
669 | * @state: PM transition of the system being carried out. | |
775b64d2 | 670 | * |
20d652d7 RW |
671 | * Execute the appropriate "resume" callback for all devices whose status |
672 | * indicates that they are suspended. | |
1eede070 | 673 | */ |
91e7c75b | 674 | void dpm_resume(pm_message_t state) |
1eede070 | 675 | { |
97df8c12 | 676 | struct device *dev; |
ecf762b2 | 677 | ktime_t starttime = ktime_get(); |
1eede070 | 678 | |
91e7c75b RW |
679 | might_sleep(); |
680 | ||
1eede070 | 681 | mutex_lock(&dpm_list_mtx); |
5af84b82 | 682 | pm_transition = state; |
098dff73 | 683 | async_error = 0; |
1eede070 | 684 | |
8a43a9ab | 685 | list_for_each_entry(dev, &dpm_suspended_list, power.entry) { |
97df8c12 RW |
686 | INIT_COMPLETION(dev->power.completion); |
687 | if (is_async(dev)) { | |
688 | get_device(dev); | |
689 | async_schedule(async_resume, dev); | |
690 | } | |
691 | } | |
692 | ||
8a43a9ab RW |
693 | while (!list_empty(&dpm_suspended_list)) { |
694 | dev = to_device(dpm_suspended_list.next); | |
1eede070 | 695 | get_device(dev); |
5b219a51 | 696 | if (!is_async(dev)) { |
1eede070 RW |
697 | int error; |
698 | ||
1eede070 RW |
699 | mutex_unlock(&dpm_list_mtx); |
700 | ||
97df8c12 | 701 | error = device_resume(dev, state, false); |
2a77c46d SL |
702 | if (error) { |
703 | suspend_stats.failed_resume++; | |
704 | dpm_save_failed_step(SUSPEND_RESUME); | |
705 | dpm_save_failed_dev(dev_name(dev)); | |
1eede070 | 706 | pm_dev_err(dev, state, "", error); |
2a77c46d | 707 | } |
5b219a51 RW |
708 | |
709 | mutex_lock(&dpm_list_mtx); | |
1eede070 RW |
710 | } |
711 | if (!list_empty(&dev->power.entry)) | |
8a43a9ab | 712 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
713 | put_device(dev); |
714 | } | |
1eede070 | 715 | mutex_unlock(&dpm_list_mtx); |
5af84b82 | 716 | async_synchronize_full(); |
ecf762b2 | 717 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
718 | } |
719 | ||
720 | /** | |
20d652d7 RW |
721 | * device_complete - Complete a PM transition for given device. |
722 | * @dev: Device to handle. | |
723 | * @state: PM transition of the system being carried out. | |
1eede070 | 724 | */ |
d1616302 | 725 | static void device_complete(struct device *dev, pm_message_t state) |
1eede070 | 726 | { |
35cd133c RW |
727 | void (*callback)(struct device *) = NULL; |
728 | char *info = NULL; | |
729 | ||
dbf37414 RW |
730 | if (dev->power.syscore) |
731 | return; | |
732 | ||
8e9394ce | 733 | device_lock(dev); |
1eede070 | 734 | |
564b905a | 735 | if (dev->pm_domain) { |
35cd133c RW |
736 | info = "completing power domain "; |
737 | callback = dev->pm_domain->ops.complete; | |
4d27e9dc | 738 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
739 | info = "completing type "; |
740 | callback = dev->type->pm->complete; | |
9659cc06 | 741 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
742 | info = "completing class "; |
743 | callback = dev->class->pm->complete; | |
9659cc06 | 744 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
745 | info = "completing bus "; |
746 | callback = dev->bus->pm->complete; | |
747 | } | |
748 | ||
749 | if (!callback && dev->driver && dev->driver->pm) { | |
750 | info = "completing driver "; | |
751 | callback = dev->driver->pm->complete; | |
752 | } | |
753 | ||
754 | if (callback) { | |
755 | pm_dev_dbg(dev, state, info); | |
756 | callback(dev); | |
1eede070 RW |
757 | } |
758 | ||
8e9394ce | 759 | device_unlock(dev); |
88d26136 AS |
760 | |
761 | pm_runtime_put_sync(dev); | |
1eede070 RW |
762 | } |
763 | ||
764 | /** | |
20d652d7 RW |
765 | * dpm_complete - Complete a PM transition for all non-sysdev devices. |
766 | * @state: PM transition of the system being carried out. | |
775b64d2 | 767 | * |
20d652d7 RW |
768 | * Execute the ->complete() callbacks for all devices whose PM status is not |
769 | * DPM_ON (this allows new devices to be registered). | |
cd59abfc | 770 | */ |
91e7c75b | 771 | void dpm_complete(pm_message_t state) |
cd59abfc | 772 | { |
1eede070 RW |
773 | struct list_head list; |
774 | ||
91e7c75b RW |
775 | might_sleep(); |
776 | ||
1eede070 | 777 | INIT_LIST_HEAD(&list); |
cd59abfc | 778 | mutex_lock(&dpm_list_mtx); |
8a43a9ab RW |
779 | while (!list_empty(&dpm_prepared_list)) { |
780 | struct device *dev = to_device(dpm_prepared_list.prev); | |
cd59abfc | 781 | |
1eede070 | 782 | get_device(dev); |
f76b168b | 783 | dev->power.is_prepared = false; |
5b219a51 RW |
784 | list_move(&dev->power.entry, &list); |
785 | mutex_unlock(&dpm_list_mtx); | |
1eede070 | 786 | |
5b219a51 | 787 | device_complete(dev, state); |
1eede070 | 788 | |
5b219a51 | 789 | mutex_lock(&dpm_list_mtx); |
1eede070 | 790 | put_device(dev); |
cd59abfc | 791 | } |
1eede070 | 792 | list_splice(&list, &dpm_list); |
cd59abfc AS |
793 | mutex_unlock(&dpm_list_mtx); |
794 | } | |
795 | ||
cd59abfc | 796 | /** |
20d652d7 RW |
797 | * dpm_resume_end - Execute "resume" callbacks and complete system transition. |
798 | * @state: PM transition of the system being carried out. | |
cd59abfc | 799 | * |
20d652d7 RW |
800 | * Execute "resume" callbacks for all devices and complete the PM transition of |
801 | * the system. | |
cd59abfc | 802 | */ |
d1616302 | 803 | void dpm_resume_end(pm_message_t state) |
cd59abfc | 804 | { |
1eede070 RW |
805 | dpm_resume(state); |
806 | dpm_complete(state); | |
cd59abfc | 807 | } |
d1616302 | 808 | EXPORT_SYMBOL_GPL(dpm_resume_end); |
cd59abfc AS |
809 | |
810 | ||
811 | /*------------------------- Suspend routines -------------------------*/ | |
812 | ||
1eede070 | 813 | /** |
20d652d7 RW |
814 | * resume_event - Return a "resume" message for given "suspend" sleep state. |
815 | * @sleep_state: PM message representing a sleep state. | |
816 | * | |
817 | * Return a PM message representing the resume event corresponding to given | |
818 | * sleep state. | |
1eede070 RW |
819 | */ |
820 | static pm_message_t resume_event(pm_message_t sleep_state) | |
cd59abfc | 821 | { |
1eede070 RW |
822 | switch (sleep_state.event) { |
823 | case PM_EVENT_SUSPEND: | |
824 | return PMSG_RESUME; | |
825 | case PM_EVENT_FREEZE: | |
826 | case PM_EVENT_QUIESCE: | |
827 | return PMSG_RECOVER; | |
828 | case PM_EVENT_HIBERNATE: | |
829 | return PMSG_RESTORE; | |
cd59abfc | 830 | } |
1eede070 | 831 | return PMSG_ON; |
cd59abfc AS |
832 | } |
833 | ||
834 | /** | |
20d652d7 RW |
835 | * device_suspend_noirq - Execute a "late suspend" callback for given device. |
836 | * @dev: Device to handle. | |
837 | * @state: PM transition of the system being carried out. | |
775b64d2 | 838 | * |
20d652d7 RW |
839 | * The driver of @dev will not receive interrupts while this function is being |
840 | * executed. | |
cd59abfc | 841 | */ |
d1616302 | 842 | static int device_suspend_noirq(struct device *dev, pm_message_t state) |
775b64d2 | 843 | { |
9cf519d1 RW |
844 | pm_callback_t callback = NULL; |
845 | char *info = NULL; | |
e7176a37 | 846 | |
dbf37414 RW |
847 | if (dev->power.syscore) |
848 | return 0; | |
849 | ||
564b905a | 850 | if (dev->pm_domain) { |
cf579dfb | 851 | info = "noirq power domain "; |
9cf519d1 | 852 | callback = pm_noirq_op(&dev->pm_domain->ops, state); |
4d27e9dc | 853 | } else if (dev->type && dev->type->pm) { |
cf579dfb | 854 | info = "noirq type "; |
9cf519d1 | 855 | callback = pm_noirq_op(dev->type->pm, state); |
9659cc06 | 856 | } else if (dev->class && dev->class->pm) { |
cf579dfb | 857 | info = "noirq class "; |
9cf519d1 | 858 | callback = pm_noirq_op(dev->class->pm, state); |
9659cc06 | 859 | } else if (dev->bus && dev->bus->pm) { |
cf579dfb | 860 | info = "noirq bus "; |
9cf519d1 | 861 | callback = pm_noirq_op(dev->bus->pm, state); |
7538e3db RW |
862 | } |
863 | ||
35cd133c | 864 | if (!callback && dev->driver && dev->driver->pm) { |
cf579dfb | 865 | info = "noirq driver "; |
35cd133c RW |
866 | callback = pm_noirq_op(dev->driver->pm, state); |
867 | } | |
868 | ||
9cf519d1 | 869 | return dpm_run_callback(callback, dev, state, info); |
775b64d2 RW |
870 | } |
871 | ||
872 | /** | |
cf579dfb | 873 | * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices. |
20d652d7 | 874 | * @state: PM transition of the system being carried out. |
775b64d2 | 875 | * |
20d652d7 RW |
876 | * Prevent device drivers from receiving interrupts and call the "noirq" suspend |
877 | * handlers for all non-sysdev devices. | |
775b64d2 | 878 | */ |
cf579dfb | 879 | static int dpm_suspend_noirq(pm_message_t state) |
775b64d2 | 880 | { |
ecf762b2 | 881 | ktime_t starttime = ktime_get(); |
775b64d2 RW |
882 | int error = 0; |
883 | ||
8651f97b | 884 | cpuidle_pause(); |
2ed8d2b3 | 885 | suspend_device_irqs(); |
32bdfac5 | 886 | mutex_lock(&dpm_list_mtx); |
cf579dfb RW |
887 | while (!list_empty(&dpm_late_early_list)) { |
888 | struct device *dev = to_device(dpm_late_early_list.prev); | |
d08a5ace RW |
889 | |
890 | get_device(dev); | |
891 | mutex_unlock(&dpm_list_mtx); | |
892 | ||
d1616302 | 893 | error = device_suspend_noirq(dev, state); |
d08a5ace RW |
894 | |
895 | mutex_lock(&dpm_list_mtx); | |
775b64d2 | 896 | if (error) { |
cf579dfb | 897 | pm_dev_err(dev, state, " noirq", error); |
2a77c46d SL |
898 | suspend_stats.failed_suspend_noirq++; |
899 | dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ); | |
900 | dpm_save_failed_dev(dev_name(dev)); | |
d08a5ace | 901 | put_device(dev); |
775b64d2 RW |
902 | break; |
903 | } | |
d08a5ace | 904 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 905 | list_move(&dev->power.entry, &dpm_noirq_list); |
d08a5ace | 906 | put_device(dev); |
52d136cc RW |
907 | |
908 | if (pm_wakeup_pending()) { | |
909 | error = -EBUSY; | |
910 | break; | |
911 | } | |
775b64d2 | 912 | } |
32bdfac5 | 913 | mutex_unlock(&dpm_list_mtx); |
775b64d2 | 914 | if (error) |
d1616302 | 915 | dpm_resume_noirq(resume_event(state)); |
cf579dfb RW |
916 | else |
917 | dpm_show_time(starttime, state, "noirq"); | |
918 | return error; | |
919 | } | |
920 | ||
921 | /** | |
922 | * device_suspend_late - Execute a "late suspend" callback for given device. | |
923 | * @dev: Device to handle. | |
924 | * @state: PM transition of the system being carried out. | |
925 | * | |
926 | * Runtime PM is disabled for @dev while this function is being executed. | |
927 | */ | |
928 | static int device_suspend_late(struct device *dev, pm_message_t state) | |
929 | { | |
930 | pm_callback_t callback = NULL; | |
931 | char *info = NULL; | |
932 | ||
dbf37414 RW |
933 | if (dev->power.syscore) |
934 | return 0; | |
935 | ||
cf579dfb RW |
936 | if (dev->pm_domain) { |
937 | info = "late power domain "; | |
938 | callback = pm_late_early_op(&dev->pm_domain->ops, state); | |
939 | } else if (dev->type && dev->type->pm) { | |
940 | info = "late type "; | |
941 | callback = pm_late_early_op(dev->type->pm, state); | |
942 | } else if (dev->class && dev->class->pm) { | |
943 | info = "late class "; | |
944 | callback = pm_late_early_op(dev->class->pm, state); | |
945 | } else if (dev->bus && dev->bus->pm) { | |
946 | info = "late bus "; | |
947 | callback = pm_late_early_op(dev->bus->pm, state); | |
948 | } | |
949 | ||
950 | if (!callback && dev->driver && dev->driver->pm) { | |
951 | info = "late driver "; | |
952 | callback = pm_late_early_op(dev->driver->pm, state); | |
953 | } | |
954 | ||
955 | return dpm_run_callback(callback, dev, state, info); | |
956 | } | |
957 | ||
958 | /** | |
959 | * dpm_suspend_late - Execute "late suspend" callbacks for all devices. | |
960 | * @state: PM transition of the system being carried out. | |
961 | */ | |
962 | static int dpm_suspend_late(pm_message_t state) | |
963 | { | |
964 | ktime_t starttime = ktime_get(); | |
965 | int error = 0; | |
966 | ||
967 | mutex_lock(&dpm_list_mtx); | |
968 | while (!list_empty(&dpm_suspended_list)) { | |
969 | struct device *dev = to_device(dpm_suspended_list.prev); | |
970 | ||
971 | get_device(dev); | |
972 | mutex_unlock(&dpm_list_mtx); | |
973 | ||
974 | error = device_suspend_late(dev, state); | |
975 | ||
976 | mutex_lock(&dpm_list_mtx); | |
977 | if (error) { | |
978 | pm_dev_err(dev, state, " late", error); | |
979 | suspend_stats.failed_suspend_late++; | |
980 | dpm_save_failed_step(SUSPEND_SUSPEND_LATE); | |
981 | dpm_save_failed_dev(dev_name(dev)); | |
982 | put_device(dev); | |
983 | break; | |
984 | } | |
985 | if (!list_empty(&dev->power.entry)) | |
986 | list_move(&dev->power.entry, &dpm_late_early_list); | |
987 | put_device(dev); | |
52d136cc RW |
988 | |
989 | if (pm_wakeup_pending()) { | |
990 | error = -EBUSY; | |
991 | break; | |
992 | } | |
cf579dfb RW |
993 | } |
994 | mutex_unlock(&dpm_list_mtx); | |
995 | if (error) | |
996 | dpm_resume_early(resume_event(state)); | |
ecf762b2 RW |
997 | else |
998 | dpm_show_time(starttime, state, "late"); | |
cf579dfb | 999 | |
775b64d2 RW |
1000 | return error; |
1001 | } | |
cf579dfb RW |
1002 | |
1003 | /** | |
1004 | * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks. | |
1005 | * @state: PM transition of the system being carried out. | |
1006 | */ | |
1007 | int dpm_suspend_end(pm_message_t state) | |
1008 | { | |
1009 | int error = dpm_suspend_late(state); | |
064b021f CC |
1010 | if (error) |
1011 | return error; | |
1012 | ||
1013 | error = dpm_suspend_noirq(state); | |
1014 | if (error) { | |
997a0311 | 1015 | dpm_resume_early(resume_event(state)); |
064b021f CC |
1016 | return error; |
1017 | } | |
cf579dfb | 1018 | |
064b021f | 1019 | return 0; |
cf579dfb RW |
1020 | } |
1021 | EXPORT_SYMBOL_GPL(dpm_suspend_end); | |
775b64d2 | 1022 | |
875ab0b7 RW |
1023 | /** |
1024 | * legacy_suspend - Execute a legacy (bus or class) suspend callback for device. | |
0a884223 RD |
1025 | * @dev: Device to suspend. |
1026 | * @state: PM transition of the system being carried out. | |
1027 | * @cb: Suspend callback to execute. | |
875ab0b7 RW |
1028 | */ |
1029 | static int legacy_suspend(struct device *dev, pm_message_t state, | |
1030 | int (*cb)(struct device *dev, pm_message_t state)) | |
1031 | { | |
1032 | int error; | |
1033 | ktime_t calltime; | |
1034 | ||
1035 | calltime = initcall_debug_start(dev); | |
1036 | ||
1037 | error = cb(dev, state); | |
1038 | suspend_report_result(cb, error); | |
1039 | ||
1040 | initcall_debug_report(dev, calltime, error); | |
1041 | ||
1042 | return error; | |
1043 | } | |
1044 | ||
775b64d2 | 1045 | /** |
20d652d7 RW |
1046 | * device_suspend - Execute "suspend" callbacks for given device. |
1047 | * @dev: Device to handle. | |
1048 | * @state: PM transition of the system being carried out. | |
5af84b82 | 1049 | * @async: If true, the device is being suspended asynchronously. |
775b64d2 | 1050 | */ |
5af84b82 | 1051 | static int __device_suspend(struct device *dev, pm_message_t state, bool async) |
cd59abfc | 1052 | { |
9cf519d1 RW |
1053 | pm_callback_t callback = NULL; |
1054 | char *info = NULL; | |
cd59abfc AS |
1055 | int error = 0; |
1056 | ||
5af84b82 | 1057 | dpm_wait_for_children(dev, async); |
7a8d37a3 | 1058 | |
5af84b82 | 1059 | if (async_error) |
1f758b23 | 1060 | goto Complete; |
1e2ef05b | 1061 | |
88d26136 AS |
1062 | /* |
1063 | * If a device configured to wake up the system from sleep states | |
1064 | * has been suspended at run time and there's a resume request pending | |
1065 | * for it, this is equivalent to the device signaling wakeup, so the | |
1066 | * system suspend operation should be aborted. | |
1067 | */ | |
1e2ef05b RW |
1068 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
1069 | pm_wakeup_event(dev, 0); | |
5af84b82 | 1070 | |
d83f905e RW |
1071 | if (pm_wakeup_pending()) { |
1072 | async_error = -EBUSY; | |
1f758b23 | 1073 | goto Complete; |
d83f905e RW |
1074 | } |
1075 | ||
dbf37414 RW |
1076 | if (dev->power.syscore) |
1077 | goto Complete; | |
1078 | ||
1e2ef05b RW |
1079 | device_lock(dev); |
1080 | ||
564b905a | 1081 | if (dev->pm_domain) { |
9cf519d1 RW |
1082 | info = "power domain "; |
1083 | callback = pm_op(&dev->pm_domain->ops, state); | |
1084 | goto Run; | |
4d27e9dc RW |
1085 | } |
1086 | ||
9659cc06 | 1087 | if (dev->type && dev->type->pm) { |
9cf519d1 RW |
1088 | info = "type "; |
1089 | callback = pm_op(dev->type->pm, state); | |
1090 | goto Run; | |
9659cc06 RW |
1091 | } |
1092 | ||
1eede070 RW |
1093 | if (dev->class) { |
1094 | if (dev->class->pm) { | |
9cf519d1 RW |
1095 | info = "class "; |
1096 | callback = pm_op(dev->class->pm, state); | |
1097 | goto Run; | |
1eede070 RW |
1098 | } else if (dev->class->suspend) { |
1099 | pm_dev_dbg(dev, state, "legacy class "); | |
875ab0b7 | 1100 | error = legacy_suspend(dev, state, dev->class->suspend); |
4d27e9dc | 1101 | goto End; |
1eede070 | 1102 | } |
cd59abfc AS |
1103 | } |
1104 | ||
1eede070 RW |
1105 | if (dev->bus) { |
1106 | if (dev->bus->pm) { | |
35cd133c | 1107 | info = "bus "; |
9cf519d1 | 1108 | callback = pm_op(dev->bus->pm, state); |
1eede070 | 1109 | } else if (dev->bus->suspend) { |
35cd133c | 1110 | pm_dev_dbg(dev, state, "legacy bus "); |
875ab0b7 | 1111 | error = legacy_suspend(dev, state, dev->bus->suspend); |
9cf519d1 | 1112 | goto End; |
1eede070 | 1113 | } |
7538e3db RW |
1114 | } |
1115 | ||
9cf519d1 | 1116 | Run: |
35cd133c RW |
1117 | if (!callback && dev->driver && dev->driver->pm) { |
1118 | info = "driver "; | |
1119 | callback = pm_op(dev->driver->pm, state); | |
1120 | } | |
1121 | ||
9cf519d1 RW |
1122 | error = dpm_run_callback(callback, dev, state, info); |
1123 | ||
1eede070 | 1124 | End: |
4ca46ff3 RW |
1125 | if (!error) { |
1126 | dev->power.is_suspended = true; | |
8b258cc8 RW |
1127 | if (dev->power.wakeup_path |
1128 | && dev->parent && !dev->parent->power.ignore_children) | |
4ca46ff3 RW |
1129 | dev->parent->power.wakeup_path = true; |
1130 | } | |
6d0e0e84 | 1131 | |
8e9394ce | 1132 | device_unlock(dev); |
1f758b23 MSB |
1133 | |
1134 | Complete: | |
5af84b82 | 1135 | complete_all(&dev->power.completion); |
7a8d37a3 | 1136 | |
88d26136 | 1137 | if (error) |
098dff73 | 1138 | async_error = error; |
88d26136 | 1139 | else if (dev->power.is_suspended) |
1e2ef05b | 1140 | __pm_runtime_disable(dev, false); |
098dff73 | 1141 | |
cd59abfc AS |
1142 | return error; |
1143 | } | |
1144 | ||
5af84b82 RW |
1145 | static void async_suspend(void *data, async_cookie_t cookie) |
1146 | { | |
1147 | struct device *dev = (struct device *)data; | |
1148 | int error; | |
1149 | ||
1150 | error = __device_suspend(dev, pm_transition, true); | |
2a77c46d SL |
1151 | if (error) { |
1152 | dpm_save_failed_dev(dev_name(dev)); | |
5af84b82 | 1153 | pm_dev_err(dev, pm_transition, " async", error); |
2a77c46d | 1154 | } |
5af84b82 RW |
1155 | |
1156 | put_device(dev); | |
1157 | } | |
1158 | ||
1159 | static int device_suspend(struct device *dev) | |
1160 | { | |
1161 | INIT_COMPLETION(dev->power.completion); | |
1162 | ||
0e06b4a8 | 1163 | if (pm_async_enabled && dev->power.async_suspend) { |
5af84b82 RW |
1164 | get_device(dev); |
1165 | async_schedule(async_suspend, dev); | |
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | return __device_suspend(dev, pm_transition, false); | |
1170 | } | |
1171 | ||
cd59abfc | 1172 | /** |
20d652d7 RW |
1173 | * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices. |
1174 | * @state: PM transition of the system being carried out. | |
cd59abfc | 1175 | */ |
91e7c75b | 1176 | int dpm_suspend(pm_message_t state) |
cd59abfc | 1177 | { |
ecf762b2 | 1178 | ktime_t starttime = ktime_get(); |
cd59abfc AS |
1179 | int error = 0; |
1180 | ||
91e7c75b RW |
1181 | might_sleep(); |
1182 | ||
cd59abfc | 1183 | mutex_lock(&dpm_list_mtx); |
5af84b82 RW |
1184 | pm_transition = state; |
1185 | async_error = 0; | |
8a43a9ab RW |
1186 | while (!list_empty(&dpm_prepared_list)) { |
1187 | struct device *dev = to_device(dpm_prepared_list.prev); | |
58aca232 | 1188 | |
1eede070 | 1189 | get_device(dev); |
cd59abfc | 1190 | mutex_unlock(&dpm_list_mtx); |
1eede070 | 1191 | |
5af84b82 | 1192 | error = device_suspend(dev); |
1eede070 | 1193 | |
1b3cbec1 | 1194 | mutex_lock(&dpm_list_mtx); |
775b64d2 | 1195 | if (error) { |
1eede070 | 1196 | pm_dev_err(dev, state, "", error); |
2a77c46d | 1197 | dpm_save_failed_dev(dev_name(dev)); |
1eede070 | 1198 | put_device(dev); |
775b64d2 RW |
1199 | break; |
1200 | } | |
7a8d37a3 | 1201 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1202 | list_move(&dev->power.entry, &dpm_suspended_list); |
1eede070 | 1203 | put_device(dev); |
5af84b82 RW |
1204 | if (async_error) |
1205 | break; | |
cd59abfc AS |
1206 | } |
1207 | mutex_unlock(&dpm_list_mtx); | |
5af84b82 RW |
1208 | async_synchronize_full(); |
1209 | if (!error) | |
1210 | error = async_error; | |
2a77c46d SL |
1211 | if (error) { |
1212 | suspend_stats.failed_suspend++; | |
1213 | dpm_save_failed_step(SUSPEND_SUSPEND); | |
1214 | } else | |
ecf762b2 | 1215 | dpm_show_time(starttime, state, NULL); |
1eede070 RW |
1216 | return error; |
1217 | } | |
1218 | ||
1219 | /** | |
20d652d7 RW |
1220 | * device_prepare - Prepare a device for system power transition. |
1221 | * @dev: Device to handle. | |
1222 | * @state: PM transition of the system being carried out. | |
1223 | * | |
1224 | * Execute the ->prepare() callback(s) for given device. No new children of the | |
1225 | * device may be registered after this function has returned. | |
1eede070 | 1226 | */ |
d1616302 | 1227 | static int device_prepare(struct device *dev, pm_message_t state) |
1eede070 | 1228 | { |
35cd133c RW |
1229 | int (*callback)(struct device *) = NULL; |
1230 | char *info = NULL; | |
1eede070 RW |
1231 | int error = 0; |
1232 | ||
dbf37414 RW |
1233 | if (dev->power.syscore) |
1234 | return 0; | |
1235 | ||
88d26136 AS |
1236 | /* |
1237 | * If a device's parent goes into runtime suspend at the wrong time, | |
1238 | * it won't be possible to resume the device. To prevent this we | |
1239 | * block runtime suspend here, during the prepare phase, and allow | |
1240 | * it again during the complete phase. | |
1241 | */ | |
1242 | pm_runtime_get_noresume(dev); | |
1243 | ||
8e9394ce | 1244 | device_lock(dev); |
1eede070 | 1245 | |
4ca46ff3 RW |
1246 | dev->power.wakeup_path = device_may_wakeup(dev); |
1247 | ||
564b905a | 1248 | if (dev->pm_domain) { |
35cd133c RW |
1249 | info = "preparing power domain "; |
1250 | callback = dev->pm_domain->ops.prepare; | |
4d27e9dc | 1251 | } else if (dev->type && dev->type->pm) { |
35cd133c RW |
1252 | info = "preparing type "; |
1253 | callback = dev->type->pm->prepare; | |
9659cc06 | 1254 | } else if (dev->class && dev->class->pm) { |
35cd133c RW |
1255 | info = "preparing class "; |
1256 | callback = dev->class->pm->prepare; | |
9659cc06 | 1257 | } else if (dev->bus && dev->bus->pm) { |
35cd133c RW |
1258 | info = "preparing bus "; |
1259 | callback = dev->bus->pm->prepare; | |
1260 | } | |
1261 | ||
1262 | if (!callback && dev->driver && dev->driver->pm) { | |
1263 | info = "preparing driver "; | |
1264 | callback = dev->driver->pm->prepare; | |
1265 | } | |
1266 | ||
1267 | if (callback) { | |
1268 | error = callback(dev); | |
1269 | suspend_report_result(callback, error); | |
1eede070 | 1270 | } |
7538e3db | 1271 | |
8e9394ce | 1272 | device_unlock(dev); |
1eede070 RW |
1273 | |
1274 | return error; | |
1275 | } | |
cd59abfc | 1276 | |
1eede070 | 1277 | /** |
20d652d7 RW |
1278 | * dpm_prepare - Prepare all non-sysdev devices for a system PM transition. |
1279 | * @state: PM transition of the system being carried out. | |
1eede070 | 1280 | * |
20d652d7 | 1281 | * Execute the ->prepare() callback(s) for all devices. |
1eede070 | 1282 | */ |
91e7c75b | 1283 | int dpm_prepare(pm_message_t state) |
1eede070 | 1284 | { |
1eede070 RW |
1285 | int error = 0; |
1286 | ||
91e7c75b RW |
1287 | might_sleep(); |
1288 | ||
1eede070 | 1289 | mutex_lock(&dpm_list_mtx); |
1eede070 RW |
1290 | while (!list_empty(&dpm_list)) { |
1291 | struct device *dev = to_device(dpm_list.next); | |
1292 | ||
1293 | get_device(dev); | |
1eede070 RW |
1294 | mutex_unlock(&dpm_list_mtx); |
1295 | ||
1e2ef05b | 1296 | error = device_prepare(dev, state); |
1eede070 RW |
1297 | |
1298 | mutex_lock(&dpm_list_mtx); | |
1299 | if (error) { | |
1eede070 RW |
1300 | if (error == -EAGAIN) { |
1301 | put_device(dev); | |
886a7a33 | 1302 | error = 0; |
1eede070 RW |
1303 | continue; |
1304 | } | |
1e75227e RW |
1305 | printk(KERN_INFO "PM: Device %s not prepared " |
1306 | "for power transition: code %d\n", | |
5c1a07ab | 1307 | dev_name(dev), error); |
1eede070 RW |
1308 | put_device(dev); |
1309 | break; | |
1310 | } | |
f76b168b | 1311 | dev->power.is_prepared = true; |
1eede070 | 1312 | if (!list_empty(&dev->power.entry)) |
8a43a9ab | 1313 | list_move_tail(&dev->power.entry, &dpm_prepared_list); |
1eede070 RW |
1314 | put_device(dev); |
1315 | } | |
1eede070 | 1316 | mutex_unlock(&dpm_list_mtx); |
cd59abfc AS |
1317 | return error; |
1318 | } | |
1319 | ||
775b64d2 | 1320 | /** |
20d652d7 RW |
1321 | * dpm_suspend_start - Prepare devices for PM transition and suspend them. |
1322 | * @state: PM transition of the system being carried out. | |
775b64d2 | 1323 | * |
20d652d7 RW |
1324 | * Prepare all non-sysdev devices for system PM transition and execute "suspend" |
1325 | * callbacks for them. | |
775b64d2 | 1326 | */ |
d1616302 | 1327 | int dpm_suspend_start(pm_message_t state) |
775b64d2 RW |
1328 | { |
1329 | int error; | |
cd59abfc | 1330 | |
1eede070 | 1331 | error = dpm_prepare(state); |
2a77c46d SL |
1332 | if (error) { |
1333 | suspend_stats.failed_prepare++; | |
1334 | dpm_save_failed_step(SUSPEND_PREPARE); | |
1335 | } else | |
1eede070 | 1336 | error = dpm_suspend(state); |
cd59abfc | 1337 | return error; |
cd59abfc | 1338 | } |
d1616302 | 1339 | EXPORT_SYMBOL_GPL(dpm_suspend_start); |
cd59abfc AS |
1340 | |
1341 | void __suspend_report_result(const char *function, void *fn, int ret) | |
1342 | { | |
c80cfb04 BH |
1343 | if (ret) |
1344 | printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret); | |
cd59abfc AS |
1345 | } |
1346 | EXPORT_SYMBOL_GPL(__suspend_report_result); | |
f8824cee RW |
1347 | |
1348 | /** | |
1349 | * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete. | |
1350 | * @dev: Device to wait for. | |
1351 | * @subordinate: Device that needs to wait for @dev. | |
1352 | */ | |
098dff73 | 1353 | int device_pm_wait_for_dev(struct device *subordinate, struct device *dev) |
f8824cee RW |
1354 | { |
1355 | dpm_wait(dev, subordinate->power.async_suspend); | |
098dff73 | 1356 | return async_error; |
f8824cee RW |
1357 | } |
1358 | EXPORT_SYMBOL_GPL(device_pm_wait_for_dev); |