2 * drivers/base/power/domain.c - Common code related to device power domains.
4 * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
6 * This file is released under the GPLv2.
9 #include <linux/init.h>
10 #include <linux/kernel.h>
12 #include <linux/pm_runtime.h>
13 #include <linux/pm_domain.h>
14 #include <linux/slab.h>
15 #include <linux/err.h>
16 #include <linux/sched.h>
17 #include <linux/suspend.h>
19 static LIST_HEAD(gpd_list);
20 static DEFINE_MUTEX(gpd_list_lock);
24 static struct generic_pm_domain *dev_to_genpd(struct device *dev)
26 if (IS_ERR_OR_NULL(dev->pm_domain))
27 return ERR_PTR(-EINVAL);
29 return pd_to_genpd(dev->pm_domain);
32 static void genpd_sd_counter_dec(struct generic_pm_domain *genpd)
34 if (!WARN_ON(genpd->sd_count == 0))
38 static void genpd_acquire_lock(struct generic_pm_domain *genpd)
42 mutex_lock(&genpd->lock);
44 * Wait for the domain to transition into either the active,
45 * or the power off state.
48 prepare_to_wait(&genpd->status_wait_queue, &wait,
49 TASK_UNINTERRUPTIBLE);
50 if (genpd->status == GPD_STATE_ACTIVE
51 || genpd->status == GPD_STATE_POWER_OFF)
53 mutex_unlock(&genpd->lock);
57 mutex_lock(&genpd->lock);
59 finish_wait(&genpd->status_wait_queue, &wait);
62 static void genpd_release_lock(struct generic_pm_domain *genpd)
64 mutex_unlock(&genpd->lock);
67 static void genpd_set_active(struct generic_pm_domain *genpd)
69 if (genpd->resume_count == 0)
70 genpd->status = GPD_STATE_ACTIVE;
74 * pm_genpd_poweron - Restore power to a given PM domain and its parents.
75 * @genpd: PM domain to power up.
77 * Restore power to @genpd and all of its parents so that it is possible to
78 * resume a device belonging to it.
80 int pm_genpd_poweron(struct generic_pm_domain *genpd)
82 struct generic_pm_domain *parent = genpd->parent;
87 genpd_acquire_lock(parent);
88 mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
90 mutex_lock(&genpd->lock);
93 if (genpd->status == GPD_STATE_ACTIVE
94 || (genpd->prepared_count > 0 && genpd->suspend_power_off))
97 if (genpd->status != GPD_STATE_POWER_OFF) {
98 genpd_set_active(genpd);
102 if (parent && parent->status != GPD_STATE_ACTIVE) {
103 mutex_unlock(&genpd->lock);
104 genpd_release_lock(parent);
106 ret = pm_genpd_poweron(parent);
113 if (genpd->power_on) {
114 ret = genpd->power_on(genpd);
119 genpd_set_active(genpd);
124 mutex_unlock(&genpd->lock);
126 genpd_release_lock(parent);
131 #endif /* CONFIG_PM */
133 #ifdef CONFIG_PM_RUNTIME
136 * __pm_genpd_save_device - Save the pre-suspend state of a device.
137 * @dle: Device list entry of the device to save the state of.
138 * @genpd: PM domain the device belongs to.
140 static int __pm_genpd_save_device(struct dev_list_entry *dle,
141 struct generic_pm_domain *genpd)
142 __releases(&genpd->lock) __acquires(&genpd->lock)
144 struct device *dev = dle->dev;
145 struct device_driver *drv = dev->driver;
148 if (dle->need_restore)
151 mutex_unlock(&genpd->lock);
153 if (drv && drv->pm && drv->pm->runtime_suspend) {
154 if (genpd->start_device)
155 genpd->start_device(dev);
157 ret = drv->pm->runtime_suspend(dev);
159 if (genpd->stop_device)
160 genpd->stop_device(dev);
163 mutex_lock(&genpd->lock);
166 dle->need_restore = true;
172 * __pm_genpd_restore_device - Restore the pre-suspend state of a device.
173 * @dle: Device list entry of the device to restore the state of.
174 * @genpd: PM domain the device belongs to.
176 static void __pm_genpd_restore_device(struct dev_list_entry *dle,
177 struct generic_pm_domain *genpd)
178 __releases(&genpd->lock) __acquires(&genpd->lock)
180 struct device *dev = dle->dev;
181 struct device_driver *drv = dev->driver;
183 if (!dle->need_restore)
186 mutex_unlock(&genpd->lock);
188 if (drv && drv->pm && drv->pm->runtime_resume) {
189 if (genpd->start_device)
190 genpd->start_device(dev);
192 drv->pm->runtime_resume(dev);
194 if (genpd->stop_device)
195 genpd->stop_device(dev);
198 mutex_lock(&genpd->lock);
200 dle->need_restore = false;
204 * genpd_abort_poweroff - Check if a PM domain power off should be aborted.
205 * @genpd: PM domain to check.
207 * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during
208 * a "power off" operation, which means that a "power on" has occured in the
209 * meantime, or if its resume_count field is different from zero, which means
210 * that one of its devices has been resumed in the meantime.
212 static bool genpd_abort_poweroff(struct generic_pm_domain *genpd)
214 return genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0;
218 * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff().
219 * @genpd: PM domait to power off.
221 * Queue up the execution of pm_genpd_poweroff() unless it's already been done
224 void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
226 if (!work_pending(&genpd->power_off_work))
227 queue_work(pm_wq, &genpd->power_off_work);
231 * pm_genpd_poweroff - Remove power from a given PM domain.
232 * @genpd: PM domain to power down.
234 * If all of the @genpd's devices have been suspended and all of its subdomains
235 * have been powered down, run the runtime suspend callbacks provided by all of
236 * the @genpd's devices' drivers and remove power from @genpd.
238 static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
239 __releases(&genpd->lock) __acquires(&genpd->lock)
241 struct generic_pm_domain *parent;
242 struct dev_list_entry *dle;
243 unsigned int not_suspended;
248 * Do not try to power off the domain in the following situations:
249 * (1) The domain is already in the "power off" state.
250 * (2) System suspend is in progress.
251 * (3) One of the domain's devices is being resumed right now.
253 if (genpd->status == GPD_STATE_POWER_OFF || genpd->prepared_count > 0
254 || genpd->resume_count > 0)
257 if (genpd->sd_count > 0)
261 list_for_each_entry(dle, &genpd->dev_list, node)
262 if (dle->dev->driver && !pm_runtime_suspended(dle->dev))
265 if (not_suspended > genpd->in_progress)
268 if (genpd->poweroff_task) {
270 * Another instance of pm_genpd_poweroff() is executing
271 * callbacks, so tell it to start over and return.
273 genpd->status = GPD_STATE_REPEAT;
277 if (genpd->gov && genpd->gov->power_down_ok) {
278 if (!genpd->gov->power_down_ok(&genpd->domain))
282 genpd->status = GPD_STATE_BUSY;
283 genpd->poweroff_task = current;
285 list_for_each_entry_reverse(dle, &genpd->dev_list, node) {
286 ret = __pm_genpd_save_device(dle, genpd);
288 genpd_set_active(genpd);
292 if (genpd_abort_poweroff(genpd))
295 if (genpd->status == GPD_STATE_REPEAT) {
296 genpd->poweroff_task = NULL;
301 parent = genpd->parent;
303 mutex_unlock(&genpd->lock);
305 genpd_acquire_lock(parent);
306 mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
308 if (genpd_abort_poweroff(genpd)) {
309 genpd_release_lock(parent);
314 if (genpd->power_off) {
315 ret = genpd->power_off(genpd);
317 genpd_set_active(genpd);
319 genpd_release_lock(parent);
325 genpd->status = GPD_STATE_POWER_OFF;
328 genpd_sd_counter_dec(parent);
329 if (parent->sd_count == 0)
330 genpd_queue_power_off_work(parent);
332 genpd_release_lock(parent);
336 genpd->poweroff_task = NULL;
337 wake_up_all(&genpd->status_wait_queue);
342 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
343 * @work: Work structure used for scheduling the execution of this function.
345 static void genpd_power_off_work_fn(struct work_struct *work)
347 struct generic_pm_domain *genpd;
349 genpd = container_of(work, struct generic_pm_domain, power_off_work);
351 genpd_acquire_lock(genpd);
352 pm_genpd_poweroff(genpd);
353 genpd_release_lock(genpd);
357 * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
358 * @dev: Device to suspend.
360 * Carry out a runtime suspend of a device under the assumption that its
361 * pm_domain field points to the domain member of an object of type
362 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
364 static int pm_genpd_runtime_suspend(struct device *dev)
366 struct generic_pm_domain *genpd;
368 dev_dbg(dev, "%s()\n", __func__);
370 genpd = dev_to_genpd(dev);
374 if (genpd->stop_device) {
375 int ret = genpd->stop_device(dev);
380 mutex_lock(&genpd->lock);
381 genpd->in_progress++;
382 pm_genpd_poweroff(genpd);
383 genpd->in_progress--;
384 mutex_unlock(&genpd->lock);
390 * __pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
391 * @dev: Device to resume.
392 * @genpd: PM domain the device belongs to.
394 static void __pm_genpd_runtime_resume(struct device *dev,
395 struct generic_pm_domain *genpd)
397 struct dev_list_entry *dle;
399 list_for_each_entry(dle, &genpd->dev_list, node) {
400 if (dle->dev == dev) {
401 __pm_genpd_restore_device(dle, genpd);
408 * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
409 * @dev: Device to resume.
411 * Carry out a runtime resume of a device under the assumption that its
412 * pm_domain field points to the domain member of an object of type
413 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
415 static int pm_genpd_runtime_resume(struct device *dev)
417 struct generic_pm_domain *genpd;
421 dev_dbg(dev, "%s()\n", __func__);
423 genpd = dev_to_genpd(dev);
427 ret = pm_genpd_poweron(genpd);
431 mutex_lock(&genpd->lock);
432 genpd->status = GPD_STATE_BUSY;
433 genpd->resume_count++;
435 prepare_to_wait(&genpd->status_wait_queue, &wait,
436 TASK_UNINTERRUPTIBLE);
438 * If current is the powering off task, we have been called
439 * reentrantly from one of the device callbacks, so we should
442 if (!genpd->poweroff_task || genpd->poweroff_task == current)
444 mutex_unlock(&genpd->lock);
448 mutex_lock(&genpd->lock);
450 finish_wait(&genpd->status_wait_queue, &wait);
451 __pm_genpd_runtime_resume(dev, genpd);
452 genpd->resume_count--;
453 genpd_set_active(genpd);
454 wake_up_all(&genpd->status_wait_queue);
455 mutex_unlock(&genpd->lock);
457 if (genpd->start_device)
458 genpd->start_device(dev);
465 static inline void genpd_power_off_work_fn(struct work_struct *work) {}
466 static inline void __pm_genpd_runtime_resume(struct device *dev,
467 struct generic_pm_domain *genpd) {}
469 #define pm_genpd_runtime_suspend NULL
470 #define pm_genpd_runtime_resume NULL
472 #endif /* CONFIG_PM_RUNTIME */
474 #ifdef CONFIG_PM_SLEEP
477 * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its parents.
478 * @genpd: PM domain to power off, if possible.
480 * Check if the given PM domain can be powered off (during system suspend or
481 * hibernation) and do that if so. Also, in that case propagate to its parent.
483 * This function is only called in "noirq" stages of system power transitions,
484 * so it need not acquire locks (all of the "noirq" callbacks are executed
485 * sequentially, so it is guaranteed that it will never run twice in parallel).
487 static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd)
489 struct generic_pm_domain *parent = genpd->parent;
491 if (genpd->status == GPD_STATE_POWER_OFF)
494 if (genpd->suspended_count != genpd->device_count || genpd->sd_count > 0)
497 if (genpd->power_off)
498 genpd->power_off(genpd);
500 genpd->status = GPD_STATE_POWER_OFF;
502 genpd_sd_counter_dec(parent);
503 pm_genpd_sync_poweroff(parent);
508 * resume_needed - Check whether to resume a device before system suspend.
509 * @dev: Device to check.
510 * @genpd: PM domain the device belongs to.
512 * There are two cases in which a device that can wake up the system from sleep
513 * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled
514 * to wake up the system and it has to remain active for this purpose while the
515 * system is in the sleep state and (2) if the device is not enabled to wake up
516 * the system from sleep states and it generally doesn't generate wakeup signals
517 * by itself (those signals are generated on its behalf by other parts of the
518 * system). In the latter case it may be necessary to reconfigure the device's
519 * wakeup settings during system suspend, because it may have been set up to
520 * signal remote wakeup from the system's working state as needed by runtime PM.
521 * Return 'true' in either of the above cases.
523 static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd)
527 if (!device_can_wakeup(dev))
530 active_wakeup = genpd->active_wakeup && genpd->active_wakeup(dev);
531 return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
535 * pm_genpd_prepare - Start power transition of a device in a PM domain.
536 * @dev: Device to start the transition of.
538 * Start a power transition of a device (during a system-wide power transition)
539 * under the assumption that its pm_domain field points to the domain member of
540 * an object of type struct generic_pm_domain representing a PM domain
541 * consisting of I/O devices.
543 static int pm_genpd_prepare(struct device *dev)
545 struct generic_pm_domain *genpd;
548 dev_dbg(dev, "%s()\n", __func__);
550 genpd = dev_to_genpd(dev);
555 * If a wakeup request is pending for the device, it should be woken up
556 * at this point and a system wakeup event should be reported if it's
557 * set up to wake up the system from sleep states.
559 pm_runtime_get_noresume(dev);
560 if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
561 pm_wakeup_event(dev, 0);
563 if (pm_wakeup_pending()) {
564 pm_runtime_put_sync(dev);
568 if (resume_needed(dev, genpd))
569 pm_runtime_resume(dev);
571 genpd_acquire_lock(genpd);
573 if (genpd->prepared_count++ == 0)
574 genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF;
576 genpd_release_lock(genpd);
578 if (genpd->suspend_power_off) {
579 pm_runtime_put_noidle(dev);
584 * The PM domain must be in the GPD_STATE_ACTIVE state at this point,
585 * so pm_genpd_poweron() will return immediately, but if the device
586 * is suspended (e.g. it's been stopped by .stop_device()), we need
587 * to make it operational.
589 pm_runtime_resume(dev);
590 __pm_runtime_disable(dev, false);
592 ret = pm_generic_prepare(dev);
594 mutex_lock(&genpd->lock);
596 if (--genpd->prepared_count == 0)
597 genpd->suspend_power_off = false;
599 mutex_unlock(&genpd->lock);
600 pm_runtime_enable(dev);
603 pm_runtime_put_sync(dev);
608 * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain.
609 * @dev: Device to suspend.
611 * Suspend a device under the assumption that its pm_domain field points to the
612 * domain member of an object of type struct generic_pm_domain representing
613 * a PM domain consisting of I/O devices.
615 static int pm_genpd_suspend(struct device *dev)
617 struct generic_pm_domain *genpd;
619 dev_dbg(dev, "%s()\n", __func__);
621 genpd = dev_to_genpd(dev);
625 return genpd->suspend_power_off ? 0 : pm_generic_suspend(dev);
629 * pm_genpd_suspend_noirq - Late suspend of a device from an I/O PM domain.
630 * @dev: Device to suspend.
632 * Carry out a late suspend of a device under the assumption that its
633 * pm_domain field points to the domain member of an object of type
634 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
636 static int pm_genpd_suspend_noirq(struct device *dev)
638 struct generic_pm_domain *genpd;
641 dev_dbg(dev, "%s()\n", __func__);
643 genpd = dev_to_genpd(dev);
647 if (genpd->suspend_power_off)
650 ret = pm_generic_suspend_noirq(dev);
654 if (device_may_wakeup(dev)
655 && genpd->active_wakeup && genpd->active_wakeup(dev))
658 if (genpd->stop_device)
659 genpd->stop_device(dev);
662 * Since all of the "noirq" callbacks are executed sequentially, it is
663 * guaranteed that this function will never run twice in parallel for
664 * the same PM domain, so it is not necessary to use locking here.
666 genpd->suspended_count++;
667 pm_genpd_sync_poweroff(genpd);
673 * pm_genpd_resume_noirq - Early resume of a device from an I/O power domain.
674 * @dev: Device to resume.
676 * Carry out an early resume of a device under the assumption that its
677 * pm_domain field points to the domain member of an object of type
678 * struct generic_pm_domain representing a power domain consisting of I/O
681 static int pm_genpd_resume_noirq(struct device *dev)
683 struct generic_pm_domain *genpd;
685 dev_dbg(dev, "%s()\n", __func__);
687 genpd = dev_to_genpd(dev);
691 if (genpd->suspend_power_off)
695 * Since all of the "noirq" callbacks are executed sequentially, it is
696 * guaranteed that this function will never run twice in parallel for
697 * the same PM domain, so it is not necessary to use locking here.
699 pm_genpd_poweron(genpd);
700 genpd->suspended_count--;
701 if (genpd->start_device)
702 genpd->start_device(dev);
704 return pm_generic_resume_noirq(dev);
708 * pm_genpd_resume - Resume a device belonging to an I/O power domain.
709 * @dev: Device to resume.
711 * Resume a device under the assumption that its pm_domain field points to the
712 * domain member of an object of type struct generic_pm_domain representing
713 * a power domain consisting of I/O devices.
715 static int pm_genpd_resume(struct device *dev)
717 struct generic_pm_domain *genpd;
719 dev_dbg(dev, "%s()\n", __func__);
721 genpd = dev_to_genpd(dev);
725 return genpd->suspend_power_off ? 0 : pm_generic_resume(dev);
729 * pm_genpd_freeze - Freeze a device belonging to an I/O power domain.
730 * @dev: Device to freeze.
732 * Freeze a device under the assumption that its pm_domain field points to the
733 * domain member of an object of type struct generic_pm_domain representing
734 * a power domain consisting of I/O devices.
736 static int pm_genpd_freeze(struct device *dev)
738 struct generic_pm_domain *genpd;
740 dev_dbg(dev, "%s()\n", __func__);
742 genpd = dev_to_genpd(dev);
746 return genpd->suspend_power_off ? 0 : pm_generic_freeze(dev);
750 * pm_genpd_freeze_noirq - Late freeze of a device from an I/O power domain.
751 * @dev: Device to freeze.
753 * Carry out a late freeze of a device under the assumption that its
754 * pm_domain field points to the domain member of an object of type
755 * struct generic_pm_domain representing a power domain consisting of I/O
758 static int pm_genpd_freeze_noirq(struct device *dev)
760 struct generic_pm_domain *genpd;
763 dev_dbg(dev, "%s()\n", __func__);
765 genpd = dev_to_genpd(dev);
769 if (genpd->suspend_power_off)
772 ret = pm_generic_freeze_noirq(dev);
776 if (genpd->stop_device)
777 genpd->stop_device(dev);
783 * pm_genpd_thaw_noirq - Early thaw of a device from an I/O power domain.
784 * @dev: Device to thaw.
786 * Carry out an early thaw of a device under the assumption that its
787 * pm_domain field points to the domain member of an object of type
788 * struct generic_pm_domain representing a power domain consisting of I/O
791 static int pm_genpd_thaw_noirq(struct device *dev)
793 struct generic_pm_domain *genpd;
795 dev_dbg(dev, "%s()\n", __func__);
797 genpd = dev_to_genpd(dev);
801 if (genpd->suspend_power_off)
804 if (genpd->start_device)
805 genpd->start_device(dev);
807 return pm_generic_thaw_noirq(dev);
811 * pm_genpd_thaw - Thaw a device belonging to an I/O power domain.
812 * @dev: Device to thaw.
814 * Thaw a device under the assumption that its pm_domain field points to the
815 * domain member of an object of type struct generic_pm_domain representing
816 * a power domain consisting of I/O devices.
818 static int pm_genpd_thaw(struct device *dev)
820 struct generic_pm_domain *genpd;
822 dev_dbg(dev, "%s()\n", __func__);
824 genpd = dev_to_genpd(dev);
828 return genpd->suspend_power_off ? 0 : pm_generic_thaw(dev);
832 * pm_genpd_dev_poweroff - Power off a device belonging to an I/O PM domain.
833 * @dev: Device to suspend.
835 * Power off a device under the assumption that its pm_domain field points to
836 * the domain member of an object of type struct generic_pm_domain representing
837 * a PM domain consisting of I/O devices.
839 static int pm_genpd_dev_poweroff(struct device *dev)
841 struct generic_pm_domain *genpd;
843 dev_dbg(dev, "%s()\n", __func__);
845 genpd = dev_to_genpd(dev);
849 return genpd->suspend_power_off ? 0 : pm_generic_poweroff(dev);
853 * pm_genpd_dev_poweroff_noirq - Late power off of a device from a PM domain.
854 * @dev: Device to suspend.
856 * Carry out a late powering off of a device under the assumption that its
857 * pm_domain field points to the domain member of an object of type
858 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
860 static int pm_genpd_dev_poweroff_noirq(struct device *dev)
862 struct generic_pm_domain *genpd;
865 dev_dbg(dev, "%s()\n", __func__);
867 genpd = dev_to_genpd(dev);
871 if (genpd->suspend_power_off)
874 ret = pm_generic_poweroff_noirq(dev);
878 if (device_may_wakeup(dev)
879 && genpd->active_wakeup && genpd->active_wakeup(dev))
882 if (genpd->stop_device)
883 genpd->stop_device(dev);
886 * Since all of the "noirq" callbacks are executed sequentially, it is
887 * guaranteed that this function will never run twice in parallel for
888 * the same PM domain, so it is not necessary to use locking here.
890 genpd->suspended_count++;
891 pm_genpd_sync_poweroff(genpd);
897 * pm_genpd_restore_noirq - Early restore of a device from an I/O power domain.
898 * @dev: Device to resume.
900 * Carry out an early restore of a device under the assumption that its
901 * pm_domain field points to the domain member of an object of type
902 * struct generic_pm_domain representing a power domain consisting of I/O
905 static int pm_genpd_restore_noirq(struct device *dev)
907 struct generic_pm_domain *genpd;
909 dev_dbg(dev, "%s()\n", __func__);
911 genpd = dev_to_genpd(dev);
916 * Since all of the "noirq" callbacks are executed sequentially, it is
917 * guaranteed that this function will never run twice in parallel for
918 * the same PM domain, so it is not necessary to use locking here.
920 genpd->status = GPD_STATE_POWER_OFF;
921 if (genpd->suspend_power_off) {
923 * The boot kernel might put the domain into the power on state,
924 * so make sure it really is powered off.
926 if (genpd->power_off)
927 genpd->power_off(genpd);
931 pm_genpd_poweron(genpd);
932 genpd->suspended_count--;
933 if (genpd->start_device)
934 genpd->start_device(dev);
936 return pm_generic_restore_noirq(dev);
940 * pm_genpd_restore - Restore a device belonging to an I/O power domain.
941 * @dev: Device to resume.
943 * Restore a device under the assumption that its pm_domain field points to the
944 * domain member of an object of type struct generic_pm_domain representing
945 * a power domain consisting of I/O devices.
947 static int pm_genpd_restore(struct device *dev)
949 struct generic_pm_domain *genpd;
951 dev_dbg(dev, "%s()\n", __func__);
953 genpd = dev_to_genpd(dev);
957 return genpd->suspend_power_off ? 0 : pm_generic_restore(dev);
961 * pm_genpd_complete - Complete power transition of a device in a power domain.
962 * @dev: Device to complete the transition of.
964 * Complete a power transition of a device (during a system-wide power
965 * transition) under the assumption that its pm_domain field points to the
966 * domain member of an object of type struct generic_pm_domain representing
967 * a power domain consisting of I/O devices.
969 static void pm_genpd_complete(struct device *dev)
971 struct generic_pm_domain *genpd;
974 dev_dbg(dev, "%s()\n", __func__);
976 genpd = dev_to_genpd(dev);
980 mutex_lock(&genpd->lock);
982 run_complete = !genpd->suspend_power_off;
983 if (--genpd->prepared_count == 0)
984 genpd->suspend_power_off = false;
986 mutex_unlock(&genpd->lock);
989 pm_generic_complete(dev);
990 pm_runtime_set_active(dev);
991 pm_runtime_enable(dev);
992 pm_runtime_idle(dev);
998 #define pm_genpd_prepare NULL
999 #define pm_genpd_suspend NULL
1000 #define pm_genpd_suspend_noirq NULL
1001 #define pm_genpd_resume_noirq NULL
1002 #define pm_genpd_resume NULL
1003 #define pm_genpd_freeze NULL
1004 #define pm_genpd_freeze_noirq NULL
1005 #define pm_genpd_thaw_noirq NULL
1006 #define pm_genpd_thaw NULL
1007 #define pm_genpd_dev_poweroff_noirq NULL
1008 #define pm_genpd_dev_poweroff NULL
1009 #define pm_genpd_restore_noirq NULL
1010 #define pm_genpd_restore NULL
1011 #define pm_genpd_complete NULL
1013 #endif /* CONFIG_PM_SLEEP */
1016 * pm_genpd_add_device - Add a device to an I/O PM domain.
1017 * @genpd: PM domain to add the device to.
1018 * @dev: Device to be added.
1020 int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
1022 struct dev_list_entry *dle;
1025 dev_dbg(dev, "%s()\n", __func__);
1027 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
1030 genpd_acquire_lock(genpd);
1032 if (genpd->status == GPD_STATE_POWER_OFF) {
1037 if (genpd->prepared_count > 0) {
1042 list_for_each_entry(dle, &genpd->dev_list, node)
1043 if (dle->dev == dev) {
1048 dle = kzalloc(sizeof(*dle), GFP_KERNEL);
1055 dle->need_restore = false;
1056 list_add_tail(&dle->node, &genpd->dev_list);
1057 genpd->device_count++;
1059 spin_lock_irq(&dev->power.lock);
1060 dev->pm_domain = &genpd->domain;
1061 spin_unlock_irq(&dev->power.lock);
1064 genpd_release_lock(genpd);
1070 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
1071 * @genpd: PM domain to remove the device from.
1072 * @dev: Device to be removed.
1074 int pm_genpd_remove_device(struct generic_pm_domain *genpd,
1077 struct dev_list_entry *dle;
1080 dev_dbg(dev, "%s()\n", __func__);
1082 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
1085 genpd_acquire_lock(genpd);
1087 if (genpd->prepared_count > 0) {
1092 list_for_each_entry(dle, &genpd->dev_list, node) {
1093 if (dle->dev != dev)
1096 spin_lock_irq(&dev->power.lock);
1097 dev->pm_domain = NULL;
1098 spin_unlock_irq(&dev->power.lock);
1100 genpd->device_count--;
1101 list_del(&dle->node);
1109 genpd_release_lock(genpd);
1115 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
1116 * @genpd: Master PM domain to add the subdomain to.
1117 * @new_subdomain: Subdomain to be added.
1119 int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
1120 struct generic_pm_domain *new_subdomain)
1122 struct generic_pm_domain *subdomain;
1125 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(new_subdomain))
1129 genpd_acquire_lock(genpd);
1130 mutex_lock_nested(&new_subdomain->lock, SINGLE_DEPTH_NESTING);
1132 if (new_subdomain->status != GPD_STATE_POWER_OFF
1133 && new_subdomain->status != GPD_STATE_ACTIVE) {
1134 mutex_unlock(&new_subdomain->lock);
1135 genpd_release_lock(genpd);
1139 if (genpd->status == GPD_STATE_POWER_OFF
1140 && new_subdomain->status != GPD_STATE_POWER_OFF) {
1145 list_for_each_entry(subdomain, &genpd->sd_list, sd_node) {
1146 if (subdomain == new_subdomain) {
1152 list_add_tail(&new_subdomain->sd_node, &genpd->sd_list);
1153 new_subdomain->parent = genpd;
1154 if (subdomain->status != GPD_STATE_POWER_OFF)
1158 mutex_unlock(&new_subdomain->lock);
1159 genpd_release_lock(genpd);
1165 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
1166 * @genpd: Master PM domain to remove the subdomain from.
1167 * @target: Subdomain to be removed.
1169 int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
1170 struct generic_pm_domain *target)
1172 struct generic_pm_domain *subdomain;
1175 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(target))
1179 genpd_acquire_lock(genpd);
1181 list_for_each_entry(subdomain, &genpd->sd_list, sd_node) {
1182 if (subdomain != target)
1185 mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
1187 if (subdomain->status != GPD_STATE_POWER_OFF
1188 && subdomain->status != GPD_STATE_ACTIVE) {
1189 mutex_unlock(&subdomain->lock);
1190 genpd_release_lock(genpd);
1194 list_del(&subdomain->sd_node);
1195 subdomain->parent = NULL;
1196 if (subdomain->status != GPD_STATE_POWER_OFF)
1197 genpd_sd_counter_dec(genpd);
1199 mutex_unlock(&subdomain->lock);
1205 genpd_release_lock(genpd);
1211 * pm_genpd_init - Initialize a generic I/O PM domain object.
1212 * @genpd: PM domain object to initialize.
1213 * @gov: PM domain governor to associate with the domain (may be NULL).
1214 * @is_off: Initial value of the domain's power_is_off field.
1216 void pm_genpd_init(struct generic_pm_domain *genpd,
1217 struct dev_power_governor *gov, bool is_off)
1219 if (IS_ERR_OR_NULL(genpd))
1222 INIT_LIST_HEAD(&genpd->sd_node);
1223 genpd->parent = NULL;
1224 INIT_LIST_HEAD(&genpd->dev_list);
1225 INIT_LIST_HEAD(&genpd->sd_list);
1226 mutex_init(&genpd->lock);
1228 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
1229 genpd->in_progress = 0;
1230 genpd->sd_count = 0;
1231 genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
1232 init_waitqueue_head(&genpd->status_wait_queue);
1233 genpd->poweroff_task = NULL;
1234 genpd->resume_count = 0;
1235 genpd->device_count = 0;
1236 genpd->suspended_count = 0;
1237 genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
1238 genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;
1239 genpd->domain.ops.runtime_idle = pm_generic_runtime_idle;
1240 genpd->domain.ops.prepare = pm_genpd_prepare;
1241 genpd->domain.ops.suspend = pm_genpd_suspend;
1242 genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq;
1243 genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq;
1244 genpd->domain.ops.resume = pm_genpd_resume;
1245 genpd->domain.ops.freeze = pm_genpd_freeze;
1246 genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq;
1247 genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq;
1248 genpd->domain.ops.thaw = pm_genpd_thaw;
1249 genpd->domain.ops.poweroff = pm_genpd_dev_poweroff;
1250 genpd->domain.ops.poweroff_noirq = pm_genpd_dev_poweroff_noirq;
1251 genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
1252 genpd->domain.ops.restore = pm_genpd_restore;
1253 genpd->domain.ops.complete = pm_genpd_complete;
1254 mutex_lock(&gpd_list_lock);
1255 list_add(&genpd->gpd_list_node, &gpd_list);
1256 mutex_unlock(&gpd_list_lock);
1260 * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use.
1262 void pm_genpd_poweroff_unused(void)
1264 struct generic_pm_domain *genpd;
1266 mutex_lock(&gpd_list_lock);
1268 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
1269 genpd_queue_power_off_work(genpd);
1271 mutex_unlock(&gpd_list_lock);