2 * drivers/base/power/main.c - Where the driver meets power management.
4 * Copyright (c) 2003 Patrick Mochel
5 * Copyright (c) 2003 Open Source Development Lab
7 * This file is released under the GPLv2
10 * The driver model core calls device_pm_add() when a device is registered.
11 * This will initialize the embedded device_pm_info object in the device
12 * and add it to the list of power-controlled devices. sysfs entries for
13 * controlling device power management will also be added.
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.
20 #include <linux/device.h>
21 #include <linux/kallsyms.h>
22 #include <linux/export.h>
23 #include <linux/mutex.h>
25 #include <linux/pm_runtime.h>
26 #include <linux/resume-trace.h>
27 #include <linux/interrupt.h>
28 #include <linux/sched.h>
29 #include <linux/async.h>
30 #include <linux/suspend.h>
31 #include <linux/cpuidle.h>
35 typedef int (*pm_callback_t)(struct device *);
38 * The entries in the dpm_list list are in a depth first order, simply
39 * because children are guaranteed to be discovered after parents, and
40 * are inserted at the back of the list on discovery.
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
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);
53 struct suspend_stats suspend_stats;
54 static DEFINE_MUTEX(dpm_list_mtx);
55 static pm_message_t pm_transition;
57 static int async_error;
60 * device_pm_init - Initialize the PM-related part of a device object.
61 * @dev: Device object being initialized.
63 void device_pm_init(struct device *dev)
65 dev->power.is_prepared = false;
66 dev->power.is_suspended = false;
67 init_completion(&dev->power.completion);
68 complete_all(&dev->power.completion);
69 dev->power.wakeup = NULL;
70 spin_lock_init(&dev->power.lock);
72 INIT_LIST_HEAD(&dev->power.entry);
73 dev->power.power_state = PMSG_INVALID;
77 * device_pm_lock - Lock the list of active devices used by the PM core.
79 void device_pm_lock(void)
81 mutex_lock(&dpm_list_mtx);
85 * device_pm_unlock - Unlock the list of active devices used by the PM core.
87 void device_pm_unlock(void)
89 mutex_unlock(&dpm_list_mtx);
93 * device_pm_add - Add a device to the PM core's list of active devices.
94 * @dev: Device to add to the list.
96 void device_pm_add(struct device *dev)
98 pr_debug("PM: Adding info for %s:%s\n",
99 dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
100 mutex_lock(&dpm_list_mtx);
101 if (dev->parent && dev->parent->power.is_prepared)
102 dev_warn(dev, "parent %s should not be sleeping\n",
103 dev_name(dev->parent));
104 list_add_tail(&dev->power.entry, &dpm_list);
105 dev_pm_qos_constraints_init(dev);
106 mutex_unlock(&dpm_list_mtx);
110 * device_pm_remove - Remove a device from the PM core's list of active devices.
111 * @dev: Device to be removed from the list.
113 void device_pm_remove(struct device *dev)
115 pr_debug("PM: Removing info for %s:%s\n",
116 dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
117 complete_all(&dev->power.completion);
118 mutex_lock(&dpm_list_mtx);
119 dev_pm_qos_constraints_destroy(dev);
120 list_del_init(&dev->power.entry);
121 mutex_unlock(&dpm_list_mtx);
122 device_wakeup_disable(dev);
123 pm_runtime_remove(dev);
127 * device_pm_move_before - Move device in the PM core's list of active devices.
128 * @deva: Device to move in dpm_list.
129 * @devb: Device @deva should come before.
131 void device_pm_move_before(struct device *deva, struct device *devb)
133 pr_debug("PM: Moving %s:%s before %s:%s\n",
134 deva->bus ? deva->bus->name : "No Bus", dev_name(deva),
135 devb->bus ? devb->bus->name : "No Bus", dev_name(devb));
136 /* Delete deva from dpm_list and reinsert before devb. */
137 list_move_tail(&deva->power.entry, &devb->power.entry);
141 * device_pm_move_after - Move device in the PM core's list of active devices.
142 * @deva: Device to move in dpm_list.
143 * @devb: Device @deva should come after.
145 void device_pm_move_after(struct device *deva, struct device *devb)
147 pr_debug("PM: Moving %s:%s after %s:%s\n",
148 deva->bus ? deva->bus->name : "No Bus", dev_name(deva),
149 devb->bus ? devb->bus->name : "No Bus", dev_name(devb));
150 /* Delete deva from dpm_list and reinsert after devb. */
151 list_move(&deva->power.entry, &devb->power.entry);
155 * device_pm_move_last - Move device to end of the PM core's list of devices.
156 * @dev: Device to move in dpm_list.
158 void device_pm_move_last(struct device *dev)
160 pr_debug("PM: Moving %s:%s to end of list\n",
161 dev->bus ? dev->bus->name : "No Bus", dev_name(dev));
162 list_move_tail(&dev->power.entry, &dpm_list);
165 static ktime_t initcall_debug_start(struct device *dev)
167 ktime_t calltime = ktime_set(0, 0);
169 if (pm_print_times_enabled) {
170 pr_info("calling %s+ @ %i, parent: %s\n",
171 dev_name(dev), task_pid_nr(current),
172 dev->parent ? dev_name(dev->parent) : "none");
173 calltime = ktime_get();
179 static void initcall_debug_report(struct device *dev, ktime_t calltime,
182 ktime_t delta, rettime;
184 if (pm_print_times_enabled) {
185 rettime = ktime_get();
186 delta = ktime_sub(rettime, calltime);
187 pr_info("call %s+ returned %d after %Ld usecs\n", dev_name(dev),
188 error, (unsigned long long)ktime_to_ns(delta) >> 10);
193 * dpm_wait - Wait for a PM operation to complete.
194 * @dev: Device to wait for.
195 * @async: If unset, wait only if the device's power.async_suspend flag is set.
197 static void dpm_wait(struct device *dev, bool async)
202 if (async || (pm_async_enabled && dev->power.async_suspend))
203 wait_for_completion(&dev->power.completion);
206 static int dpm_wait_fn(struct device *dev, void *async_ptr)
208 dpm_wait(dev, *((bool *)async_ptr));
212 static void dpm_wait_for_children(struct device *dev, bool async)
214 device_for_each_child(dev, &async, dpm_wait_fn);
218 * pm_op - Return the PM operation appropriate for given PM event.
219 * @ops: PM operations to choose from.
220 * @state: PM transition of the system being carried out.
222 static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state)
224 switch (state.event) {
225 #ifdef CONFIG_SUSPEND
226 case PM_EVENT_SUSPEND:
228 case PM_EVENT_RESUME:
230 #endif /* CONFIG_SUSPEND */
231 #ifdef CONFIG_HIBERNATE_CALLBACKS
232 case PM_EVENT_FREEZE:
233 case PM_EVENT_QUIESCE:
235 case PM_EVENT_HIBERNATE:
236 return ops->poweroff;
238 case PM_EVENT_RECOVER:
241 case PM_EVENT_RESTORE:
243 #endif /* CONFIG_HIBERNATE_CALLBACKS */
250 * pm_late_early_op - Return the PM operation appropriate for given PM event.
251 * @ops: PM operations to choose from.
252 * @state: PM transition of the system being carried out.
254 * Runtime PM is disabled for @dev while this function is being executed.
256 static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops,
259 switch (state.event) {
260 #ifdef CONFIG_SUSPEND
261 case PM_EVENT_SUSPEND:
262 return ops->suspend_late;
263 case PM_EVENT_RESUME:
264 return ops->resume_early;
265 #endif /* CONFIG_SUSPEND */
266 #ifdef CONFIG_HIBERNATE_CALLBACKS
267 case PM_EVENT_FREEZE:
268 case PM_EVENT_QUIESCE:
269 return ops->freeze_late;
270 case PM_EVENT_HIBERNATE:
271 return ops->poweroff_late;
273 case PM_EVENT_RECOVER:
274 return ops->thaw_early;
275 case PM_EVENT_RESTORE:
276 return ops->restore_early;
277 #endif /* CONFIG_HIBERNATE_CALLBACKS */
284 * pm_noirq_op - Return the PM operation appropriate for given PM event.
285 * @ops: PM operations to choose from.
286 * @state: PM transition of the system being carried out.
288 * The driver of @dev will not receive interrupts while this function is being
291 static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state)
293 switch (state.event) {
294 #ifdef CONFIG_SUSPEND
295 case PM_EVENT_SUSPEND:
296 return ops->suspend_noirq;
297 case PM_EVENT_RESUME:
298 return ops->resume_noirq;
299 #endif /* CONFIG_SUSPEND */
300 #ifdef CONFIG_HIBERNATE_CALLBACKS
301 case PM_EVENT_FREEZE:
302 case PM_EVENT_QUIESCE:
303 return ops->freeze_noirq;
304 case PM_EVENT_HIBERNATE:
305 return ops->poweroff_noirq;
307 case PM_EVENT_RECOVER:
308 return ops->thaw_noirq;
309 case PM_EVENT_RESTORE:
310 return ops->restore_noirq;
311 #endif /* CONFIG_HIBERNATE_CALLBACKS */
317 static char *pm_verb(int event)
320 case PM_EVENT_SUSPEND:
322 case PM_EVENT_RESUME:
324 case PM_EVENT_FREEZE:
326 case PM_EVENT_QUIESCE:
328 case PM_EVENT_HIBERNATE:
332 case PM_EVENT_RESTORE:
334 case PM_EVENT_RECOVER:
337 return "(unknown PM event)";
341 static void pm_dev_dbg(struct device *dev, pm_message_t state, char *info)
343 dev_dbg(dev, "%s%s%s\n", info, pm_verb(state.event),
344 ((state.event & PM_EVENT_SLEEP) && device_may_wakeup(dev)) ?
345 ", may wakeup" : "");
348 static void pm_dev_err(struct device *dev, pm_message_t state, char *info,
351 printk(KERN_ERR "PM: Device %s failed to %s%s: error %d\n",
352 dev_name(dev), pm_verb(state.event), info, error);
355 static void dpm_show_time(ktime_t starttime, pm_message_t state, char *info)
361 calltime = ktime_get();
362 usecs64 = ktime_to_ns(ktime_sub(calltime, starttime));
363 do_div(usecs64, NSEC_PER_USEC);
367 pr_info("PM: %s%s%s of devices complete after %ld.%03ld msecs\n",
368 info ?: "", info ? " " : "", pm_verb(state.event),
369 usecs / USEC_PER_MSEC, usecs % USEC_PER_MSEC);
372 static int dpm_run_callback(pm_callback_t cb, struct device *dev,
373 pm_message_t state, char *info)
381 calltime = initcall_debug_start(dev);
383 pm_dev_dbg(dev, state, info);
385 suspend_report_result(cb, error);
387 initcall_debug_report(dev, calltime, error);
392 /*------------------------- Resume routines -------------------------*/
395 * device_resume_noirq - Execute an "early resume" callback for given device.
396 * @dev: Device to handle.
397 * @state: PM transition of the system being carried out.
399 * The driver of @dev will not receive interrupts while this function is being
402 static int device_resume_noirq(struct device *dev, pm_message_t state)
404 pm_callback_t callback = NULL;
411 if (dev->pm_domain) {
412 info = "noirq power domain ";
413 callback = pm_noirq_op(&dev->pm_domain->ops, state);
414 } else if (dev->type && dev->type->pm) {
415 info = "noirq type ";
416 callback = pm_noirq_op(dev->type->pm, state);
417 } else if (dev->class && dev->class->pm) {
418 info = "noirq class ";
419 callback = pm_noirq_op(dev->class->pm, state);
420 } else if (dev->bus && dev->bus->pm) {
422 callback = pm_noirq_op(dev->bus->pm, state);
425 if (!callback && dev->driver && dev->driver->pm) {
426 info = "noirq driver ";
427 callback = pm_noirq_op(dev->driver->pm, state);
430 error = dpm_run_callback(callback, dev, state, info);
437 * dpm_resume_noirq - Execute "noirq resume" callbacks for all devices.
438 * @state: PM transition of the system being carried out.
440 * Call the "noirq" resume handlers for all devices in dpm_noirq_list and
441 * enable device drivers to receive interrupts.
443 static void dpm_resume_noirq(pm_message_t state)
445 ktime_t starttime = ktime_get();
447 mutex_lock(&dpm_list_mtx);
448 while (!list_empty(&dpm_noirq_list)) {
449 struct device *dev = to_device(dpm_noirq_list.next);
453 list_move_tail(&dev->power.entry, &dpm_late_early_list);
454 mutex_unlock(&dpm_list_mtx);
456 error = device_resume_noirq(dev, state);
458 suspend_stats.failed_resume_noirq++;
459 dpm_save_failed_step(SUSPEND_RESUME_NOIRQ);
460 dpm_save_failed_dev(dev_name(dev));
461 pm_dev_err(dev, state, " noirq", error);
464 mutex_lock(&dpm_list_mtx);
467 mutex_unlock(&dpm_list_mtx);
468 dpm_show_time(starttime, state, "noirq");
469 resume_device_irqs();
474 * device_resume_early - Execute an "early resume" callback for given device.
475 * @dev: Device to handle.
476 * @state: PM transition of the system being carried out.
478 * Runtime PM is disabled for @dev while this function is being executed.
480 static int device_resume_early(struct device *dev, pm_message_t state)
482 pm_callback_t callback = NULL;
489 if (dev->pm_domain) {
490 info = "early power domain ";
491 callback = pm_late_early_op(&dev->pm_domain->ops, state);
492 } else if (dev->type && dev->type->pm) {
493 info = "early type ";
494 callback = pm_late_early_op(dev->type->pm, state);
495 } else if (dev->class && dev->class->pm) {
496 info = "early class ";
497 callback = pm_late_early_op(dev->class->pm, state);
498 } else if (dev->bus && dev->bus->pm) {
500 callback = pm_late_early_op(dev->bus->pm, state);
503 if (!callback && dev->driver && dev->driver->pm) {
504 info = "early driver ";
505 callback = pm_late_early_op(dev->driver->pm, state);
508 error = dpm_run_callback(callback, dev, state, info);
515 * dpm_resume_early - Execute "early resume" callbacks for all devices.
516 * @state: PM transition of the system being carried out.
518 static void dpm_resume_early(pm_message_t state)
520 ktime_t starttime = ktime_get();
522 mutex_lock(&dpm_list_mtx);
523 while (!list_empty(&dpm_late_early_list)) {
524 struct device *dev = to_device(dpm_late_early_list.next);
528 list_move_tail(&dev->power.entry, &dpm_suspended_list);
529 mutex_unlock(&dpm_list_mtx);
531 error = device_resume_early(dev, state);
533 suspend_stats.failed_resume_early++;
534 dpm_save_failed_step(SUSPEND_RESUME_EARLY);
535 dpm_save_failed_dev(dev_name(dev));
536 pm_dev_err(dev, state, " early", error);
539 mutex_lock(&dpm_list_mtx);
542 mutex_unlock(&dpm_list_mtx);
543 dpm_show_time(starttime, state, "early");
547 * dpm_resume_start - Execute "noirq" and "early" device callbacks.
548 * @state: PM transition of the system being carried out.
550 void dpm_resume_start(pm_message_t state)
552 dpm_resume_noirq(state);
553 dpm_resume_early(state);
555 EXPORT_SYMBOL_GPL(dpm_resume_start);
558 * device_resume - Execute "resume" callbacks for given device.
559 * @dev: Device to handle.
560 * @state: PM transition of the system being carried out.
561 * @async: If true, the device is being resumed asynchronously.
563 static int device_resume(struct device *dev, pm_message_t state, bool async)
565 pm_callback_t callback = NULL;
573 dpm_wait(dev->parent, async);
577 * This is a fib. But we'll allow new children to be added below
578 * a resumed device, even if the device hasn't been completed yet.
580 dev->power.is_prepared = false;
582 if (!dev->power.is_suspended)
585 pm_runtime_enable(dev);
588 if (dev->pm_domain) {
589 info = "power domain ";
590 callback = pm_op(&dev->pm_domain->ops, state);
594 if (dev->type && dev->type->pm) {
596 callback = pm_op(dev->type->pm, state);
601 if (dev->class->pm) {
603 callback = pm_op(dev->class->pm, state);
605 } else if (dev->class->resume) {
606 info = "legacy class ";
607 callback = dev->class->resume;
615 callback = pm_op(dev->bus->pm, state);
616 } else if (dev->bus->resume) {
617 info = "legacy bus ";
618 callback = dev->bus->resume;
624 if (!callback && dev->driver && dev->driver->pm) {
626 callback = pm_op(dev->driver->pm, state);
630 error = dpm_run_callback(callback, dev, state, info);
631 dev->power.is_suspended = false;
635 complete_all(&dev->power.completion);
640 pm_runtime_put_sync(dev);
645 static void async_resume(void *data, async_cookie_t cookie)
647 struct device *dev = (struct device *)data;
650 error = device_resume(dev, pm_transition, true);
652 pm_dev_err(dev, pm_transition, " async", error);
656 static bool is_async(struct device *dev)
658 return dev->power.async_suspend && pm_async_enabled
659 && !pm_trace_is_enabled();
663 * dpm_resume - Execute "resume" callbacks for non-sysdev devices.
664 * @state: PM transition of the system being carried out.
666 * Execute the appropriate "resume" callback for all devices whose status
667 * indicates that they are suspended.
669 void dpm_resume(pm_message_t state)
672 ktime_t starttime = ktime_get();
676 mutex_lock(&dpm_list_mtx);
677 pm_transition = state;
680 list_for_each_entry(dev, &dpm_suspended_list, power.entry) {
681 INIT_COMPLETION(dev->power.completion);
684 async_schedule(async_resume, dev);
688 while (!list_empty(&dpm_suspended_list)) {
689 dev = to_device(dpm_suspended_list.next);
691 if (!is_async(dev)) {
694 mutex_unlock(&dpm_list_mtx);
696 error = device_resume(dev, state, false);
698 suspend_stats.failed_resume++;
699 dpm_save_failed_step(SUSPEND_RESUME);
700 dpm_save_failed_dev(dev_name(dev));
701 pm_dev_err(dev, state, "", error);
704 mutex_lock(&dpm_list_mtx);
706 if (!list_empty(&dev->power.entry))
707 list_move_tail(&dev->power.entry, &dpm_prepared_list);
710 mutex_unlock(&dpm_list_mtx);
711 async_synchronize_full();
712 dpm_show_time(starttime, state, NULL);
716 * device_complete - Complete a PM transition for given device.
717 * @dev: Device to handle.
718 * @state: PM transition of the system being carried out.
720 static void device_complete(struct device *dev, pm_message_t state)
722 void (*callback)(struct device *) = NULL;
727 if (dev->pm_domain) {
728 info = "completing power domain ";
729 callback = dev->pm_domain->ops.complete;
730 } else if (dev->type && dev->type->pm) {
731 info = "completing type ";
732 callback = dev->type->pm->complete;
733 } else if (dev->class && dev->class->pm) {
734 info = "completing class ";
735 callback = dev->class->pm->complete;
736 } else if (dev->bus && dev->bus->pm) {
737 info = "completing bus ";
738 callback = dev->bus->pm->complete;
741 if (!callback && dev->driver && dev->driver->pm) {
742 info = "completing driver ";
743 callback = dev->driver->pm->complete;
747 pm_dev_dbg(dev, state, info);
755 * dpm_complete - Complete a PM transition for all non-sysdev devices.
756 * @state: PM transition of the system being carried out.
758 * Execute the ->complete() callbacks for all devices whose PM status is not
759 * DPM_ON (this allows new devices to be registered).
761 void dpm_complete(pm_message_t state)
763 struct list_head list;
767 INIT_LIST_HEAD(&list);
768 mutex_lock(&dpm_list_mtx);
769 while (!list_empty(&dpm_prepared_list)) {
770 struct device *dev = to_device(dpm_prepared_list.prev);
773 dev->power.is_prepared = false;
774 list_move(&dev->power.entry, &list);
775 mutex_unlock(&dpm_list_mtx);
777 device_complete(dev, state);
779 mutex_lock(&dpm_list_mtx);
782 list_splice(&list, &dpm_list);
783 mutex_unlock(&dpm_list_mtx);
787 * dpm_resume_end - Execute "resume" callbacks and complete system transition.
788 * @state: PM transition of the system being carried out.
790 * Execute "resume" callbacks for all devices and complete the PM transition of
793 void dpm_resume_end(pm_message_t state)
798 EXPORT_SYMBOL_GPL(dpm_resume_end);
801 /*------------------------- Suspend routines -------------------------*/
804 * resume_event - Return a "resume" message for given "suspend" sleep state.
805 * @sleep_state: PM message representing a sleep state.
807 * Return a PM message representing the resume event corresponding to given
810 static pm_message_t resume_event(pm_message_t sleep_state)
812 switch (sleep_state.event) {
813 case PM_EVENT_SUSPEND:
815 case PM_EVENT_FREEZE:
816 case PM_EVENT_QUIESCE:
818 case PM_EVENT_HIBERNATE:
825 * device_suspend_noirq - Execute a "late suspend" callback for given device.
826 * @dev: Device to handle.
827 * @state: PM transition of the system being carried out.
829 * The driver of @dev will not receive interrupts while this function is being
832 static int device_suspend_noirq(struct device *dev, pm_message_t state)
834 pm_callback_t callback = NULL;
837 if (dev->pm_domain) {
838 info = "noirq power domain ";
839 callback = pm_noirq_op(&dev->pm_domain->ops, state);
840 } else if (dev->type && dev->type->pm) {
841 info = "noirq type ";
842 callback = pm_noirq_op(dev->type->pm, state);
843 } else if (dev->class && dev->class->pm) {
844 info = "noirq class ";
845 callback = pm_noirq_op(dev->class->pm, state);
846 } else if (dev->bus && dev->bus->pm) {
848 callback = pm_noirq_op(dev->bus->pm, state);
851 if (!callback && dev->driver && dev->driver->pm) {
852 info = "noirq driver ";
853 callback = pm_noirq_op(dev->driver->pm, state);
856 return dpm_run_callback(callback, dev, state, info);
860 * dpm_suspend_noirq - Execute "noirq suspend" callbacks for all devices.
861 * @state: PM transition of the system being carried out.
863 * Prevent device drivers from receiving interrupts and call the "noirq" suspend
864 * handlers for all non-sysdev devices.
866 static int dpm_suspend_noirq(pm_message_t state)
868 ktime_t starttime = ktime_get();
872 suspend_device_irqs();
873 mutex_lock(&dpm_list_mtx);
874 while (!list_empty(&dpm_late_early_list)) {
875 struct device *dev = to_device(dpm_late_early_list.prev);
878 mutex_unlock(&dpm_list_mtx);
880 error = device_suspend_noirq(dev, state);
882 mutex_lock(&dpm_list_mtx);
884 pm_dev_err(dev, state, " noirq", error);
885 suspend_stats.failed_suspend_noirq++;
886 dpm_save_failed_step(SUSPEND_SUSPEND_NOIRQ);
887 dpm_save_failed_dev(dev_name(dev));
891 if (!list_empty(&dev->power.entry))
892 list_move(&dev->power.entry, &dpm_noirq_list);
895 if (pm_wakeup_pending()) {
900 mutex_unlock(&dpm_list_mtx);
902 dpm_resume_noirq(resume_event(state));
904 dpm_show_time(starttime, state, "noirq");
909 * device_suspend_late - Execute a "late suspend" callback for given device.
910 * @dev: Device to handle.
911 * @state: PM transition of the system being carried out.
913 * Runtime PM is disabled for @dev while this function is being executed.
915 static int device_suspend_late(struct device *dev, pm_message_t state)
917 pm_callback_t callback = NULL;
920 if (dev->pm_domain) {
921 info = "late power domain ";
922 callback = pm_late_early_op(&dev->pm_domain->ops, state);
923 } else if (dev->type && dev->type->pm) {
925 callback = pm_late_early_op(dev->type->pm, state);
926 } else if (dev->class && dev->class->pm) {
927 info = "late class ";
928 callback = pm_late_early_op(dev->class->pm, state);
929 } else if (dev->bus && dev->bus->pm) {
931 callback = pm_late_early_op(dev->bus->pm, state);
934 if (!callback && dev->driver && dev->driver->pm) {
935 info = "late driver ";
936 callback = pm_late_early_op(dev->driver->pm, state);
939 return dpm_run_callback(callback, dev, state, info);
943 * dpm_suspend_late - Execute "late suspend" callbacks for all devices.
944 * @state: PM transition of the system being carried out.
946 static int dpm_suspend_late(pm_message_t state)
948 ktime_t starttime = ktime_get();
951 mutex_lock(&dpm_list_mtx);
952 while (!list_empty(&dpm_suspended_list)) {
953 struct device *dev = to_device(dpm_suspended_list.prev);
956 mutex_unlock(&dpm_list_mtx);
958 error = device_suspend_late(dev, state);
960 mutex_lock(&dpm_list_mtx);
962 pm_dev_err(dev, state, " late", error);
963 suspend_stats.failed_suspend_late++;
964 dpm_save_failed_step(SUSPEND_SUSPEND_LATE);
965 dpm_save_failed_dev(dev_name(dev));
969 if (!list_empty(&dev->power.entry))
970 list_move(&dev->power.entry, &dpm_late_early_list);
973 if (pm_wakeup_pending()) {
978 mutex_unlock(&dpm_list_mtx);
980 dpm_resume_early(resume_event(state));
982 dpm_show_time(starttime, state, "late");
988 * dpm_suspend_end - Execute "late" and "noirq" device suspend callbacks.
989 * @state: PM transition of the system being carried out.
991 int dpm_suspend_end(pm_message_t state)
993 int error = dpm_suspend_late(state);
997 error = dpm_suspend_noirq(state);
999 dpm_resume_early(state);
1005 EXPORT_SYMBOL_GPL(dpm_suspend_end);
1008 * legacy_suspend - Execute a legacy (bus or class) suspend callback for device.
1009 * @dev: Device to suspend.
1010 * @state: PM transition of the system being carried out.
1011 * @cb: Suspend callback to execute.
1013 static int legacy_suspend(struct device *dev, pm_message_t state,
1014 int (*cb)(struct device *dev, pm_message_t state))
1019 calltime = initcall_debug_start(dev);
1021 error = cb(dev, state);
1022 suspend_report_result(cb, error);
1024 initcall_debug_report(dev, calltime, error);
1030 * device_suspend - Execute "suspend" callbacks for given device.
1031 * @dev: Device to handle.
1032 * @state: PM transition of the system being carried out.
1033 * @async: If true, the device is being suspended asynchronously.
1035 static int __device_suspend(struct device *dev, pm_message_t state, bool async)
1037 pm_callback_t callback = NULL;
1041 dpm_wait_for_children(dev, async);
1046 pm_runtime_get_noresume(dev);
1047 if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
1048 pm_wakeup_event(dev, 0);
1050 if (pm_wakeup_pending()) {
1051 pm_runtime_put_sync(dev);
1052 async_error = -EBUSY;
1058 if (dev->pm_domain) {
1059 info = "power domain ";
1060 callback = pm_op(&dev->pm_domain->ops, state);
1064 if (dev->type && dev->type->pm) {
1066 callback = pm_op(dev->type->pm, state);
1071 if (dev->class->pm) {
1073 callback = pm_op(dev->class->pm, state);
1075 } else if (dev->class->suspend) {
1076 pm_dev_dbg(dev, state, "legacy class ");
1077 error = legacy_suspend(dev, state, dev->class->suspend);
1085 callback = pm_op(dev->bus->pm, state);
1086 } else if (dev->bus->suspend) {
1087 pm_dev_dbg(dev, state, "legacy bus ");
1088 error = legacy_suspend(dev, state, dev->bus->suspend);
1094 if (!callback && dev->driver && dev->driver->pm) {
1096 callback = pm_op(dev->driver->pm, state);
1099 error = dpm_run_callback(callback, dev, state, info);
1103 dev->power.is_suspended = true;
1104 if (dev->power.wakeup_path
1105 && dev->parent && !dev->parent->power.ignore_children)
1106 dev->parent->power.wakeup_path = true;
1112 complete_all(&dev->power.completion);
1115 pm_runtime_put_sync(dev);
1116 async_error = error;
1117 } else if (dev->power.is_suspended) {
1118 __pm_runtime_disable(dev, false);
1124 static void async_suspend(void *data, async_cookie_t cookie)
1126 struct device *dev = (struct device *)data;
1129 error = __device_suspend(dev, pm_transition, true);
1131 dpm_save_failed_dev(dev_name(dev));
1132 pm_dev_err(dev, pm_transition, " async", error);
1138 static int device_suspend(struct device *dev)
1140 INIT_COMPLETION(dev->power.completion);
1142 if (pm_async_enabled && dev->power.async_suspend) {
1144 async_schedule(async_suspend, dev);
1148 return __device_suspend(dev, pm_transition, false);
1152 * dpm_suspend - Execute "suspend" callbacks for all non-sysdev devices.
1153 * @state: PM transition of the system being carried out.
1155 int dpm_suspend(pm_message_t state)
1157 ktime_t starttime = ktime_get();
1162 mutex_lock(&dpm_list_mtx);
1163 pm_transition = state;
1165 while (!list_empty(&dpm_prepared_list)) {
1166 struct device *dev = to_device(dpm_prepared_list.prev);
1169 mutex_unlock(&dpm_list_mtx);
1171 error = device_suspend(dev);
1173 mutex_lock(&dpm_list_mtx);
1175 pm_dev_err(dev, state, "", error);
1176 dpm_save_failed_dev(dev_name(dev));
1180 if (!list_empty(&dev->power.entry))
1181 list_move(&dev->power.entry, &dpm_suspended_list);
1186 mutex_unlock(&dpm_list_mtx);
1187 async_synchronize_full();
1189 error = async_error;
1191 suspend_stats.failed_suspend++;
1192 dpm_save_failed_step(SUSPEND_SUSPEND);
1194 dpm_show_time(starttime, state, NULL);
1199 * device_prepare - Prepare a device for system power transition.
1200 * @dev: Device to handle.
1201 * @state: PM transition of the system being carried out.
1203 * Execute the ->prepare() callback(s) for given device. No new children of the
1204 * device may be registered after this function has returned.
1206 static int device_prepare(struct device *dev, pm_message_t state)
1208 int (*callback)(struct device *) = NULL;
1214 dev->power.wakeup_path = device_may_wakeup(dev);
1216 if (dev->pm_domain) {
1217 info = "preparing power domain ";
1218 callback = dev->pm_domain->ops.prepare;
1219 } else if (dev->type && dev->type->pm) {
1220 info = "preparing type ";
1221 callback = dev->type->pm->prepare;
1222 } else if (dev->class && dev->class->pm) {
1223 info = "preparing class ";
1224 callback = dev->class->pm->prepare;
1225 } else if (dev->bus && dev->bus->pm) {
1226 info = "preparing bus ";
1227 callback = dev->bus->pm->prepare;
1230 if (!callback && dev->driver && dev->driver->pm) {
1231 info = "preparing driver ";
1232 callback = dev->driver->pm->prepare;
1236 error = callback(dev);
1237 suspend_report_result(callback, error);
1246 * dpm_prepare - Prepare all non-sysdev devices for a system PM transition.
1247 * @state: PM transition of the system being carried out.
1249 * Execute the ->prepare() callback(s) for all devices.
1251 int dpm_prepare(pm_message_t state)
1257 mutex_lock(&dpm_list_mtx);
1258 while (!list_empty(&dpm_list)) {
1259 struct device *dev = to_device(dpm_list.next);
1262 mutex_unlock(&dpm_list_mtx);
1264 error = device_prepare(dev, state);
1266 mutex_lock(&dpm_list_mtx);
1268 if (error == -EAGAIN) {
1273 printk(KERN_INFO "PM: Device %s not prepared "
1274 "for power transition: code %d\n",
1275 dev_name(dev), error);
1279 dev->power.is_prepared = true;
1280 if (!list_empty(&dev->power.entry))
1281 list_move_tail(&dev->power.entry, &dpm_prepared_list);
1284 mutex_unlock(&dpm_list_mtx);
1289 * dpm_suspend_start - Prepare devices for PM transition and suspend them.
1290 * @state: PM transition of the system being carried out.
1292 * Prepare all non-sysdev devices for system PM transition and execute "suspend"
1293 * callbacks for them.
1295 int dpm_suspend_start(pm_message_t state)
1299 error = dpm_prepare(state);
1301 suspend_stats.failed_prepare++;
1302 dpm_save_failed_step(SUSPEND_PREPARE);
1304 error = dpm_suspend(state);
1307 EXPORT_SYMBOL_GPL(dpm_suspend_start);
1309 void __suspend_report_result(const char *function, void *fn, int ret)
1312 printk(KERN_ERR "%s(): %pF returns %d\n", function, fn, ret);
1314 EXPORT_SYMBOL_GPL(__suspend_report_result);
1317 * device_pm_wait_for_dev - Wait for suspend/resume of a device to complete.
1318 * @dev: Device to wait for.
1319 * @subordinate: Device that needs to wait for @dev.
1321 int device_pm_wait_for_dev(struct device *subordinate, struct device *dev)
1323 dpm_wait(dev, subordinate->power.async_suspend);
1326 EXPORT_SYMBOL_GPL(device_pm_wait_for_dev);