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/pm_qos.h>
15 #include <linux/slab.h>
16 #include <linux/err.h>
17 #include <linux/sched.h>
18 #include <linux/suspend.h>
19 #include <linux/export.h>
21 #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \
23 type (*__routine)(struct device *__d); \
24 type __ret = (type)0; \
26 __routine = genpd->dev_ops.callback; \
28 __ret = __routine(dev); \
30 __routine = dev_gpd_data(dev)->ops.callback; \
32 __ret = __routine(dev); \
37 #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \
39 ktime_t __start = ktime_get(); \
40 type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \
41 s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \
42 struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \
43 if (!__retval && __elapsed > __td->field) { \
44 __td->field = __elapsed; \
45 dev_warn(dev, name " latency exceeded, new value %lld ns\n", \
47 genpd->max_off_time_changed = true; \
48 __td->constraint_changed = true; \
53 static LIST_HEAD(gpd_list);
54 static DEFINE_MUTEX(gpd_list_lock);
58 struct generic_pm_domain *dev_to_genpd(struct device *dev)
60 if (IS_ERR_OR_NULL(dev->pm_domain))
61 return ERR_PTR(-EINVAL);
63 return pd_to_genpd(dev->pm_domain);
66 static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev)
68 return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev,
69 stop_latency_ns, "stop");
72 static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev)
74 return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev,
75 start_latency_ns, "start");
78 static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
82 if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
83 ret = !!atomic_dec_and_test(&genpd->sd_count);
88 static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
90 atomic_inc(&genpd->sd_count);
91 smp_mb__after_atomic_inc();
94 static void genpd_acquire_lock(struct generic_pm_domain *genpd)
98 mutex_lock(&genpd->lock);
100 * Wait for the domain to transition into either the active,
101 * or the power off state.
104 prepare_to_wait(&genpd->status_wait_queue, &wait,
105 TASK_UNINTERRUPTIBLE);
106 if (genpd->status == GPD_STATE_ACTIVE
107 || genpd->status == GPD_STATE_POWER_OFF)
109 mutex_unlock(&genpd->lock);
113 mutex_lock(&genpd->lock);
115 finish_wait(&genpd->status_wait_queue, &wait);
118 static void genpd_release_lock(struct generic_pm_domain *genpd)
120 mutex_unlock(&genpd->lock);
123 static void genpd_set_active(struct generic_pm_domain *genpd)
125 if (genpd->resume_count == 0)
126 genpd->status = GPD_STATE_ACTIVE;
129 static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd)
133 if (!genpd->cpu_data)
136 usecs64 = genpd->power_on_latency_ns;
137 do_div(usecs64, NSEC_PER_USEC);
138 usecs64 += genpd->cpu_data->saved_exit_latency;
139 genpd->cpu_data->idle_state->exit_latency = usecs64;
143 * __pm_genpd_poweron - Restore power to a given PM domain and its masters.
144 * @genpd: PM domain to power up.
146 * Restore power to @genpd and all of its masters so that it is possible to
147 * resume a device belonging to it.
149 static int __pm_genpd_poweron(struct generic_pm_domain *genpd)
150 __releases(&genpd->lock) __acquires(&genpd->lock)
152 struct gpd_link *link;
156 /* If the domain's master is being waited for, we have to wait too. */
158 prepare_to_wait(&genpd->status_wait_queue, &wait,
159 TASK_UNINTERRUPTIBLE);
160 if (genpd->status != GPD_STATE_WAIT_MASTER)
162 mutex_unlock(&genpd->lock);
166 mutex_lock(&genpd->lock);
168 finish_wait(&genpd->status_wait_queue, &wait);
170 if (genpd->status == GPD_STATE_ACTIVE
171 || (genpd->prepared_count > 0 && genpd->suspend_power_off))
174 if (genpd->status != GPD_STATE_POWER_OFF) {
175 genpd_set_active(genpd);
179 if (genpd->cpu_data) {
180 cpuidle_pause_and_lock();
181 genpd->cpu_data->idle_state->disabled = true;
182 cpuidle_resume_and_unlock();
187 * The list is guaranteed not to change while the loop below is being
188 * executed, unless one of the masters' .power_on() callbacks fiddles
191 list_for_each_entry(link, &genpd->slave_links, slave_node) {
192 genpd_sd_counter_inc(link->master);
193 genpd->status = GPD_STATE_WAIT_MASTER;
195 mutex_unlock(&genpd->lock);
197 ret = pm_genpd_poweron(link->master);
199 mutex_lock(&genpd->lock);
202 * The "wait for parent" status is guaranteed not to change
203 * while the master is powering on.
205 genpd->status = GPD_STATE_POWER_OFF;
206 wake_up_all(&genpd->status_wait_queue);
208 genpd_sd_counter_dec(link->master);
213 if (genpd->power_on) {
214 ktime_t time_start = ktime_get();
217 ret = genpd->power_on(genpd);
221 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
222 if (elapsed_ns > genpd->power_on_latency_ns) {
223 genpd->power_on_latency_ns = elapsed_ns;
224 genpd->max_off_time_changed = true;
225 genpd_recalc_cpu_exit_latency(genpd);
227 pr_warning("%s: Power-on latency exceeded, "
228 "new value %lld ns\n", genpd->name,
234 genpd_set_active(genpd);
239 list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node)
240 genpd_sd_counter_dec(link->master);
246 * pm_genpd_poweron - Restore power to a given PM domain and its masters.
247 * @genpd: PM domain to power up.
249 int pm_genpd_poweron(struct generic_pm_domain *genpd)
253 mutex_lock(&genpd->lock);
254 ret = __pm_genpd_poweron(genpd);
255 mutex_unlock(&genpd->lock);
259 #endif /* CONFIG_PM */
261 #ifdef CONFIG_PM_RUNTIME
263 static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev)
265 return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev,
266 save_state_latency_ns, "state save");
269 static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev)
271 return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev,
272 restore_state_latency_ns,
276 static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
277 unsigned long val, void *ptr)
279 struct generic_pm_domain_data *gpd_data;
282 gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
284 mutex_lock(&gpd_data->lock);
285 dev = gpd_data->base.dev;
287 mutex_unlock(&gpd_data->lock);
290 mutex_unlock(&gpd_data->lock);
293 struct generic_pm_domain *genpd;
294 struct pm_domain_data *pdd;
296 spin_lock_irq(&dev->power.lock);
298 pdd = dev->power.subsys_data ?
299 dev->power.subsys_data->domain_data : NULL;
300 if (pdd && pdd->dev) {
301 to_gpd_data(pdd)->td.constraint_changed = true;
302 genpd = dev_to_genpd(dev);
304 genpd = ERR_PTR(-ENODATA);
307 spin_unlock_irq(&dev->power.lock);
309 if (!IS_ERR(genpd)) {
310 mutex_lock(&genpd->lock);
311 genpd->max_off_time_changed = true;
312 mutex_unlock(&genpd->lock);
316 if (!dev || dev->power.ignore_children)
324 * __pm_genpd_save_device - Save the pre-suspend state of a device.
325 * @pdd: Domain data of the device to save the state of.
326 * @genpd: PM domain the device belongs to.
328 static int __pm_genpd_save_device(struct pm_domain_data *pdd,
329 struct generic_pm_domain *genpd)
330 __releases(&genpd->lock) __acquires(&genpd->lock)
332 struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
333 struct device *dev = pdd->dev;
336 if (gpd_data->need_restore)
339 mutex_unlock(&genpd->lock);
341 genpd_start_dev(genpd, dev);
342 ret = genpd_save_dev(genpd, dev);
343 genpd_stop_dev(genpd, dev);
345 mutex_lock(&genpd->lock);
348 gpd_data->need_restore = true;
354 * __pm_genpd_restore_device - Restore the pre-suspend state of a device.
355 * @pdd: Domain data of the device to restore the state of.
356 * @genpd: PM domain the device belongs to.
358 static void __pm_genpd_restore_device(struct pm_domain_data *pdd,
359 struct generic_pm_domain *genpd)
360 __releases(&genpd->lock) __acquires(&genpd->lock)
362 struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
363 struct device *dev = pdd->dev;
364 bool need_restore = gpd_data->need_restore;
366 gpd_data->need_restore = false;
367 mutex_unlock(&genpd->lock);
369 genpd_start_dev(genpd, dev);
371 genpd_restore_dev(genpd, dev);
373 mutex_lock(&genpd->lock);
377 * genpd_abort_poweroff - Check if a PM domain power off should be aborted.
378 * @genpd: PM domain to check.
380 * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during
381 * a "power off" operation, which means that a "power on" has occured in the
382 * meantime, or if its resume_count field is different from zero, which means
383 * that one of its devices has been resumed in the meantime.
385 static bool genpd_abort_poweroff(struct generic_pm_domain *genpd)
387 return genpd->status == GPD_STATE_WAIT_MASTER
388 || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0;
392 * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff().
393 * @genpd: PM domait to power off.
395 * Queue up the execution of pm_genpd_poweroff() unless it's already been done
398 void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
400 if (!work_pending(&genpd->power_off_work))
401 queue_work(pm_wq, &genpd->power_off_work);
405 * pm_genpd_poweroff - Remove power from a given PM domain.
406 * @genpd: PM domain to power down.
408 * If all of the @genpd's devices have been suspended and all of its subdomains
409 * have been powered down, run the runtime suspend callbacks provided by all of
410 * the @genpd's devices' drivers and remove power from @genpd.
412 static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
413 __releases(&genpd->lock) __acquires(&genpd->lock)
415 struct pm_domain_data *pdd;
416 struct gpd_link *link;
417 unsigned int not_suspended;
422 * Do not try to power off the domain in the following situations:
423 * (1) The domain is already in the "power off" state.
424 * (2) The domain is waiting for its master to power up.
425 * (3) One of the domain's devices is being resumed right now.
426 * (4) System suspend is in progress.
428 if (genpd->status == GPD_STATE_POWER_OFF
429 || genpd->status == GPD_STATE_WAIT_MASTER
430 || genpd->resume_count > 0 || genpd->prepared_count > 0)
433 if (atomic_read(&genpd->sd_count) > 0)
437 list_for_each_entry(pdd, &genpd->dev_list, list_node)
438 if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev)
439 || pdd->dev->power.irq_safe || to_gpd_data(pdd)->always_on))
442 if (not_suspended > genpd->in_progress)
445 if (genpd->poweroff_task) {
447 * Another instance of pm_genpd_poweroff() is executing
448 * callbacks, so tell it to start over and return.
450 genpd->status = GPD_STATE_REPEAT;
454 if (genpd->gov && genpd->gov->power_down_ok) {
455 if (!genpd->gov->power_down_ok(&genpd->domain))
459 genpd->status = GPD_STATE_BUSY;
460 genpd->poweroff_task = current;
462 list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) {
463 ret = atomic_read(&genpd->sd_count) == 0 ?
464 __pm_genpd_save_device(pdd, genpd) : -EBUSY;
466 if (genpd_abort_poweroff(genpd))
470 genpd_set_active(genpd);
474 if (genpd->status == GPD_STATE_REPEAT) {
475 genpd->poweroff_task = NULL;
480 if (genpd->cpu_data) {
482 * If cpu_data is set, cpuidle should turn the domain off when
483 * the CPU in it is idle. In that case we don't decrement the
484 * subdomain counts of the master domains, so that power is not
485 * removed from the current domain prematurely as a result of
486 * cutting off the masters' power.
488 genpd->status = GPD_STATE_POWER_OFF;
489 cpuidle_pause_and_lock();
490 genpd->cpu_data->idle_state->disabled = false;
491 cpuidle_resume_and_unlock();
495 if (genpd->power_off) {
499 if (atomic_read(&genpd->sd_count) > 0) {
504 time_start = ktime_get();
507 * If sd_count > 0 at this point, one of the subdomains hasn't
508 * managed to call pm_genpd_poweron() for the master yet after
509 * incrementing it. In that case pm_genpd_poweron() will wait
510 * for us to drop the lock, so we can call .power_off() and let
511 * the pm_genpd_poweron() restore power for us (this shouldn't
512 * happen very often).
514 ret = genpd->power_off(genpd);
516 genpd_set_active(genpd);
520 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
521 if (elapsed_ns > genpd->power_off_latency_ns) {
522 genpd->power_off_latency_ns = elapsed_ns;
523 genpd->max_off_time_changed = true;
525 pr_warning("%s: Power-off latency exceeded, "
526 "new value %lld ns\n", genpd->name,
531 genpd->status = GPD_STATE_POWER_OFF;
533 list_for_each_entry(link, &genpd->slave_links, slave_node) {
534 genpd_sd_counter_dec(link->master);
535 genpd_queue_power_off_work(link->master);
539 genpd->poweroff_task = NULL;
540 wake_up_all(&genpd->status_wait_queue);
545 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
546 * @work: Work structure used for scheduling the execution of this function.
548 static void genpd_power_off_work_fn(struct work_struct *work)
550 struct generic_pm_domain *genpd;
552 genpd = container_of(work, struct generic_pm_domain, power_off_work);
554 genpd_acquire_lock(genpd);
555 pm_genpd_poweroff(genpd);
556 genpd_release_lock(genpd);
560 * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
561 * @dev: Device to suspend.
563 * Carry out a runtime suspend of a device under the assumption that its
564 * pm_domain field points to the domain member of an object of type
565 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
567 static int pm_genpd_runtime_suspend(struct device *dev)
569 struct generic_pm_domain *genpd;
570 bool (*stop_ok)(struct device *__dev);
573 dev_dbg(dev, "%s()\n", __func__);
575 genpd = dev_to_genpd(dev);
579 might_sleep_if(!genpd->dev_irq_safe);
581 if (dev_gpd_data(dev)->always_on)
584 stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL;
585 if (stop_ok && !stop_ok(dev))
588 ret = genpd_stop_dev(genpd, dev);
593 * If power.irq_safe is set, this routine will be run with interrupts
594 * off, so it can't use mutexes.
596 if (dev->power.irq_safe)
599 mutex_lock(&genpd->lock);
600 genpd->in_progress++;
601 pm_genpd_poweroff(genpd);
602 genpd->in_progress--;
603 mutex_unlock(&genpd->lock);
609 * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
610 * @dev: Device to resume.
612 * Carry out a runtime resume of a device under the assumption that its
613 * pm_domain field points to the domain member of an object of type
614 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
616 static int pm_genpd_runtime_resume(struct device *dev)
618 struct generic_pm_domain *genpd;
622 dev_dbg(dev, "%s()\n", __func__);
624 genpd = dev_to_genpd(dev);
628 might_sleep_if(!genpd->dev_irq_safe);
630 /* If power.irq_safe, the PM domain is never powered off. */
631 if (dev->power.irq_safe)
632 return genpd_start_dev(genpd, dev);
634 mutex_lock(&genpd->lock);
635 ret = __pm_genpd_poweron(genpd);
637 mutex_unlock(&genpd->lock);
640 genpd->status = GPD_STATE_BUSY;
641 genpd->resume_count++;
643 prepare_to_wait(&genpd->status_wait_queue, &wait,
644 TASK_UNINTERRUPTIBLE);
646 * If current is the powering off task, we have been called
647 * reentrantly from one of the device callbacks, so we should
650 if (!genpd->poweroff_task || genpd->poweroff_task == current)
652 mutex_unlock(&genpd->lock);
656 mutex_lock(&genpd->lock);
658 finish_wait(&genpd->status_wait_queue, &wait);
659 __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd);
660 genpd->resume_count--;
661 genpd_set_active(genpd);
662 wake_up_all(&genpd->status_wait_queue);
663 mutex_unlock(&genpd->lock);
669 * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use.
671 void pm_genpd_poweroff_unused(void)
673 struct generic_pm_domain *genpd;
675 mutex_lock(&gpd_list_lock);
677 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
678 genpd_queue_power_off_work(genpd);
680 mutex_unlock(&gpd_list_lock);
685 static inline int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
686 unsigned long val, void *ptr)
691 static inline void genpd_power_off_work_fn(struct work_struct *work) {}
693 #define pm_genpd_runtime_suspend NULL
694 #define pm_genpd_runtime_resume NULL
696 #endif /* CONFIG_PM_RUNTIME */
698 #ifdef CONFIG_PM_SLEEP
700 static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd,
703 return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev);
706 static int genpd_suspend_dev(struct generic_pm_domain *genpd, struct device *dev)
708 return GENPD_DEV_CALLBACK(genpd, int, suspend, dev);
711 static int genpd_suspend_late(struct generic_pm_domain *genpd, struct device *dev)
713 return GENPD_DEV_CALLBACK(genpd, int, suspend_late, dev);
716 static int genpd_resume_early(struct generic_pm_domain *genpd, struct device *dev)
718 return GENPD_DEV_CALLBACK(genpd, int, resume_early, dev);
721 static int genpd_resume_dev(struct generic_pm_domain *genpd, struct device *dev)
723 return GENPD_DEV_CALLBACK(genpd, int, resume, dev);
726 static int genpd_freeze_dev(struct generic_pm_domain *genpd, struct device *dev)
728 return GENPD_DEV_CALLBACK(genpd, int, freeze, dev);
731 static int genpd_freeze_late(struct generic_pm_domain *genpd, struct device *dev)
733 return GENPD_DEV_CALLBACK(genpd, int, freeze_late, dev);
736 static int genpd_thaw_early(struct generic_pm_domain *genpd, struct device *dev)
738 return GENPD_DEV_CALLBACK(genpd, int, thaw_early, dev);
741 static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev)
743 return GENPD_DEV_CALLBACK(genpd, int, thaw, dev);
747 * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters.
748 * @genpd: PM domain to power off, if possible.
750 * Check if the given PM domain can be powered off (during system suspend or
751 * hibernation) and do that if so. Also, in that case propagate to its masters.
753 * This function is only called in "noirq" stages of system power transitions,
754 * so it need not acquire locks (all of the "noirq" callbacks are executed
755 * sequentially, so it is guaranteed that it will never run twice in parallel).
757 static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd)
759 struct gpd_link *link;
761 if (genpd->status == GPD_STATE_POWER_OFF)
764 if (genpd->suspended_count != genpd->device_count
765 || atomic_read(&genpd->sd_count) > 0)
768 if (genpd->power_off)
769 genpd->power_off(genpd);
771 genpd->status = GPD_STATE_POWER_OFF;
773 list_for_each_entry(link, &genpd->slave_links, slave_node) {
774 genpd_sd_counter_dec(link->master);
775 pm_genpd_sync_poweroff(link->master);
780 * resume_needed - Check whether to resume a device before system suspend.
781 * @dev: Device to check.
782 * @genpd: PM domain the device belongs to.
784 * There are two cases in which a device that can wake up the system from sleep
785 * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled
786 * to wake up the system and it has to remain active for this purpose while the
787 * system is in the sleep state and (2) if the device is not enabled to wake up
788 * the system from sleep states and it generally doesn't generate wakeup signals
789 * by itself (those signals are generated on its behalf by other parts of the
790 * system). In the latter case it may be necessary to reconfigure the device's
791 * wakeup settings during system suspend, because it may have been set up to
792 * signal remote wakeup from the system's working state as needed by runtime PM.
793 * Return 'true' in either of the above cases.
795 static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd)
799 if (!device_can_wakeup(dev))
802 active_wakeup = genpd_dev_active_wakeup(genpd, dev);
803 return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
807 * pm_genpd_prepare - Start power transition of a device in a PM domain.
808 * @dev: Device to start the transition of.
810 * Start a power transition of a device (during a system-wide power transition)
811 * under the assumption that its pm_domain field points to the domain member of
812 * an object of type struct generic_pm_domain representing a PM domain
813 * consisting of I/O devices.
815 static int pm_genpd_prepare(struct device *dev)
817 struct generic_pm_domain *genpd;
820 dev_dbg(dev, "%s()\n", __func__);
822 genpd = dev_to_genpd(dev);
827 * If a wakeup request is pending for the device, it should be woken up
828 * at this point and a system wakeup event should be reported if it's
829 * set up to wake up the system from sleep states.
831 pm_runtime_get_noresume(dev);
832 if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
833 pm_wakeup_event(dev, 0);
835 if (pm_wakeup_pending()) {
836 pm_runtime_put_sync(dev);
840 if (resume_needed(dev, genpd))
841 pm_runtime_resume(dev);
843 genpd_acquire_lock(genpd);
845 if (genpd->prepared_count++ == 0) {
846 genpd->suspended_count = 0;
847 genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF;
850 genpd_release_lock(genpd);
852 if (genpd->suspend_power_off) {
853 pm_runtime_put_noidle(dev);
858 * The PM domain must be in the GPD_STATE_ACTIVE state at this point,
859 * so pm_genpd_poweron() will return immediately, but if the device
860 * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need
861 * to make it operational.
863 pm_runtime_resume(dev);
864 __pm_runtime_disable(dev, false);
866 ret = pm_generic_prepare(dev);
868 mutex_lock(&genpd->lock);
870 if (--genpd->prepared_count == 0)
871 genpd->suspend_power_off = false;
873 mutex_unlock(&genpd->lock);
874 pm_runtime_enable(dev);
877 pm_runtime_put_sync(dev);
882 * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain.
883 * @dev: Device to suspend.
885 * Suspend a device under the assumption that its pm_domain field points to the
886 * domain member of an object of type struct generic_pm_domain representing
887 * a PM domain consisting of I/O devices.
889 static int pm_genpd_suspend(struct device *dev)
891 struct generic_pm_domain *genpd;
893 dev_dbg(dev, "%s()\n", __func__);
895 genpd = dev_to_genpd(dev);
899 return genpd->suspend_power_off ? 0 : genpd_suspend_dev(genpd, dev);
903 * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain.
904 * @dev: Device to suspend.
906 * Carry out a late suspend of a device under the assumption that its
907 * pm_domain field points to the domain member of an object of type
908 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
910 static int pm_genpd_suspend_late(struct device *dev)
912 struct generic_pm_domain *genpd;
914 dev_dbg(dev, "%s()\n", __func__);
916 genpd = dev_to_genpd(dev);
920 return genpd->suspend_power_off ? 0 : genpd_suspend_late(genpd, dev);
924 * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
925 * @dev: Device to suspend.
927 * Stop the device and remove power from the domain if all devices in it have
930 static int pm_genpd_suspend_noirq(struct device *dev)
932 struct generic_pm_domain *genpd;
934 dev_dbg(dev, "%s()\n", __func__);
936 genpd = dev_to_genpd(dev);
940 if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on
941 || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
944 genpd_stop_dev(genpd, dev);
947 * Since all of the "noirq" callbacks are executed sequentially, it is
948 * guaranteed that this function will never run twice in parallel for
949 * the same PM domain, so it is not necessary to use locking here.
951 genpd->suspended_count++;
952 pm_genpd_sync_poweroff(genpd);
958 * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain.
959 * @dev: Device to resume.
961 * Restore power to the device's PM domain, if necessary, and start the device.
963 static int pm_genpd_resume_noirq(struct device *dev)
965 struct generic_pm_domain *genpd;
967 dev_dbg(dev, "%s()\n", __func__);
969 genpd = dev_to_genpd(dev);
973 if (genpd->suspend_power_off || dev_gpd_data(dev)->always_on
974 || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
978 * Since all of the "noirq" callbacks are executed sequentially, it is
979 * guaranteed that this function will never run twice in parallel for
980 * the same PM domain, so it is not necessary to use locking here.
982 pm_genpd_poweron(genpd);
983 genpd->suspended_count--;
985 return genpd_start_dev(genpd, dev);
989 * pm_genpd_resume_early - Early resume of a device in an I/O PM domain.
990 * @dev: Device to resume.
992 * Carry out an early resume of a device under the assumption that its
993 * pm_domain field points to the domain member of an object of type
994 * struct generic_pm_domain representing a power domain consisting of I/O
997 static int pm_genpd_resume_early(struct device *dev)
999 struct generic_pm_domain *genpd;
1001 dev_dbg(dev, "%s()\n", __func__);
1003 genpd = dev_to_genpd(dev);
1007 return genpd->suspend_power_off ? 0 : genpd_resume_early(genpd, dev);
1011 * pm_genpd_resume - Resume of device in an I/O PM domain.
1012 * @dev: Device to resume.
1014 * Resume a device under the assumption that its pm_domain field points to the
1015 * domain member of an object of type struct generic_pm_domain representing
1016 * a power domain consisting of I/O devices.
1018 static int pm_genpd_resume(struct device *dev)
1020 struct generic_pm_domain *genpd;
1022 dev_dbg(dev, "%s()\n", __func__);
1024 genpd = dev_to_genpd(dev);
1028 return genpd->suspend_power_off ? 0 : genpd_resume_dev(genpd, dev);
1032 * pm_genpd_freeze - Freezing a device in an I/O PM domain.
1033 * @dev: Device to freeze.
1035 * Freeze a device under the assumption that its pm_domain field points to the
1036 * domain member of an object of type struct generic_pm_domain representing
1037 * a power domain consisting of I/O devices.
1039 static int pm_genpd_freeze(struct device *dev)
1041 struct generic_pm_domain *genpd;
1043 dev_dbg(dev, "%s()\n", __func__);
1045 genpd = dev_to_genpd(dev);
1049 return genpd->suspend_power_off ? 0 : genpd_freeze_dev(genpd, dev);
1053 * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain.
1054 * @dev: Device to freeze.
1056 * Carry out a late freeze of a device under the assumption that its
1057 * pm_domain field points to the domain member of an object of type
1058 * struct generic_pm_domain representing a power domain consisting of I/O
1061 static int pm_genpd_freeze_late(struct device *dev)
1063 struct generic_pm_domain *genpd;
1065 dev_dbg(dev, "%s()\n", __func__);
1067 genpd = dev_to_genpd(dev);
1071 return genpd->suspend_power_off ? 0 : genpd_freeze_late(genpd, dev);
1075 * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
1076 * @dev: Device to freeze.
1078 * Carry out a late freeze of a device under the assumption that its
1079 * pm_domain field points to the domain member of an object of type
1080 * struct generic_pm_domain representing a power domain consisting of I/O
1083 static int pm_genpd_freeze_noirq(struct device *dev)
1085 struct generic_pm_domain *genpd;
1087 dev_dbg(dev, "%s()\n", __func__);
1089 genpd = dev_to_genpd(dev);
1093 return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ?
1094 0 : genpd_stop_dev(genpd, dev);
1098 * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
1099 * @dev: Device to thaw.
1101 * Start the device, unless power has been removed from the domain already
1102 * before the system transition.
1104 static int pm_genpd_thaw_noirq(struct device *dev)
1106 struct generic_pm_domain *genpd;
1108 dev_dbg(dev, "%s()\n", __func__);
1110 genpd = dev_to_genpd(dev);
1114 return genpd->suspend_power_off || dev_gpd_data(dev)->always_on ?
1115 0 : genpd_start_dev(genpd, dev);
1119 * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain.
1120 * @dev: Device to thaw.
1122 * Carry out an early thaw of a device under the assumption that its
1123 * pm_domain field points to the domain member of an object of type
1124 * struct generic_pm_domain representing a power domain consisting of I/O
1127 static int pm_genpd_thaw_early(struct device *dev)
1129 struct generic_pm_domain *genpd;
1131 dev_dbg(dev, "%s()\n", __func__);
1133 genpd = dev_to_genpd(dev);
1137 return genpd->suspend_power_off ? 0 : genpd_thaw_early(genpd, dev);
1141 * pm_genpd_thaw - Thaw a device belonging to an I/O power domain.
1142 * @dev: Device to thaw.
1144 * Thaw a device under the assumption that its pm_domain field points to the
1145 * domain member of an object of type struct generic_pm_domain representing
1146 * a power domain consisting of I/O devices.
1148 static int pm_genpd_thaw(struct device *dev)
1150 struct generic_pm_domain *genpd;
1152 dev_dbg(dev, "%s()\n", __func__);
1154 genpd = dev_to_genpd(dev);
1158 return genpd->suspend_power_off ? 0 : genpd_thaw_dev(genpd, dev);
1162 * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain.
1163 * @dev: Device to resume.
1165 * Make sure the domain will be in the same power state as before the
1166 * hibernation the system is resuming from and start the device if necessary.
1168 static int pm_genpd_restore_noirq(struct device *dev)
1170 struct generic_pm_domain *genpd;
1172 dev_dbg(dev, "%s()\n", __func__);
1174 genpd = dev_to_genpd(dev);
1179 * Since all of the "noirq" callbacks are executed sequentially, it is
1180 * guaranteed that this function will never run twice in parallel for
1181 * the same PM domain, so it is not necessary to use locking here.
1183 * At this point suspended_count == 0 means we are being run for the
1184 * first time for the given domain in the present cycle.
1186 if (genpd->suspended_count++ == 0) {
1188 * The boot kernel might put the domain into arbitrary state,
1189 * so make it appear as powered off to pm_genpd_poweron(), so
1190 * that it tries to power it on in case it was really off.
1192 genpd->status = GPD_STATE_POWER_OFF;
1193 if (genpd->suspend_power_off) {
1195 * If the domain was off before the hibernation, make
1196 * sure it will be off going forward.
1198 if (genpd->power_off)
1199 genpd->power_off(genpd);
1205 if (genpd->suspend_power_off)
1208 pm_genpd_poweron(genpd);
1210 return dev_gpd_data(dev)->always_on ? 0 : genpd_start_dev(genpd, dev);
1214 * pm_genpd_complete - Complete power transition of a device in a power domain.
1215 * @dev: Device to complete the transition of.
1217 * Complete a power transition of a device (during a system-wide power
1218 * transition) under the assumption that its pm_domain field points to the
1219 * domain member of an object of type struct generic_pm_domain representing
1220 * a power domain consisting of I/O devices.
1222 static void pm_genpd_complete(struct device *dev)
1224 struct generic_pm_domain *genpd;
1227 dev_dbg(dev, "%s()\n", __func__);
1229 genpd = dev_to_genpd(dev);
1233 mutex_lock(&genpd->lock);
1235 run_complete = !genpd->suspend_power_off;
1236 if (--genpd->prepared_count == 0)
1237 genpd->suspend_power_off = false;
1239 mutex_unlock(&genpd->lock);
1242 pm_generic_complete(dev);
1243 pm_runtime_set_active(dev);
1244 pm_runtime_enable(dev);
1245 pm_runtime_idle(dev);
1251 #define pm_genpd_prepare NULL
1252 #define pm_genpd_suspend NULL
1253 #define pm_genpd_suspend_late NULL
1254 #define pm_genpd_suspend_noirq NULL
1255 #define pm_genpd_resume_early NULL
1256 #define pm_genpd_resume_noirq NULL
1257 #define pm_genpd_resume NULL
1258 #define pm_genpd_freeze NULL
1259 #define pm_genpd_freeze_late NULL
1260 #define pm_genpd_freeze_noirq NULL
1261 #define pm_genpd_thaw_early NULL
1262 #define pm_genpd_thaw_noirq NULL
1263 #define pm_genpd_thaw NULL
1264 #define pm_genpd_restore_noirq NULL
1265 #define pm_genpd_complete NULL
1267 #endif /* CONFIG_PM_SLEEP */
1269 static struct generic_pm_domain_data *__pm_genpd_alloc_dev_data(struct device *dev)
1271 struct generic_pm_domain_data *gpd_data;
1273 gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
1277 mutex_init(&gpd_data->lock);
1278 gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
1279 dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1283 static void __pm_genpd_free_dev_data(struct device *dev,
1284 struct generic_pm_domain_data *gpd_data)
1286 dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
1291 * __pm_genpd_add_device - Add a device to an I/O PM domain.
1292 * @genpd: PM domain to add the device to.
1293 * @dev: Device to be added.
1294 * @td: Set of PM QoS timing parameters to attach to the device.
1296 int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
1297 struct gpd_timing_data *td)
1299 struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL;
1300 struct pm_domain_data *pdd;
1303 dev_dbg(dev, "%s()\n", __func__);
1305 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
1308 gpd_data_new = __pm_genpd_alloc_dev_data(dev);
1312 genpd_acquire_lock(genpd);
1314 if (genpd->prepared_count > 0) {
1319 list_for_each_entry(pdd, &genpd->dev_list, list_node)
1320 if (pdd->dev == dev) {
1325 ret = dev_pm_get_subsys_data(dev);
1329 genpd->device_count++;
1330 genpd->max_off_time_changed = true;
1332 spin_lock_irq(&dev->power.lock);
1334 dev->pm_domain = &genpd->domain;
1335 if (dev->power.subsys_data->domain_data) {
1336 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
1338 gpd_data = gpd_data_new;
1339 dev->power.subsys_data->domain_data = &gpd_data->base;
1341 gpd_data->refcount++;
1345 spin_unlock_irq(&dev->power.lock);
1347 mutex_lock(&gpd_data->lock);
1348 gpd_data->base.dev = dev;
1349 list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
1350 gpd_data->need_restore = genpd->status == GPD_STATE_POWER_OFF;
1351 gpd_data->td.constraint_changed = true;
1352 gpd_data->td.effective_constraint_ns = -1;
1353 mutex_unlock(&gpd_data->lock);
1356 genpd_release_lock(genpd);
1358 if (gpd_data != gpd_data_new)
1359 __pm_genpd_free_dev_data(dev, gpd_data_new);
1365 * __pm_genpd_of_add_device - Add a device to an I/O PM domain.
1366 * @genpd_node: Device tree node pointer representing a PM domain to which the
1367 * the device is added to.
1368 * @dev: Device to be added.
1369 * @td: Set of PM QoS timing parameters to attach to the device.
1371 int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev,
1372 struct gpd_timing_data *td)
1374 struct generic_pm_domain *genpd = NULL, *gpd;
1376 dev_dbg(dev, "%s()\n", __func__);
1378 if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev))
1381 mutex_lock(&gpd_list_lock);
1382 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
1383 if (gpd->of_node == genpd_node) {
1388 mutex_unlock(&gpd_list_lock);
1393 return __pm_genpd_add_device(genpd, dev, td);
1397 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
1398 * @genpd: PM domain to remove the device from.
1399 * @dev: Device to be removed.
1401 int pm_genpd_remove_device(struct generic_pm_domain *genpd,
1404 struct generic_pm_domain_data *gpd_data;
1405 struct pm_domain_data *pdd;
1406 bool remove = false;
1409 dev_dbg(dev, "%s()\n", __func__);
1411 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)
1412 || IS_ERR_OR_NULL(dev->pm_domain)
1413 || pd_to_genpd(dev->pm_domain) != genpd)
1416 genpd_acquire_lock(genpd);
1418 if (genpd->prepared_count > 0) {
1423 genpd->device_count--;
1424 genpd->max_off_time_changed = true;
1426 spin_lock_irq(&dev->power.lock);
1428 dev->pm_domain = NULL;
1429 pdd = dev->power.subsys_data->domain_data;
1430 list_del_init(&pdd->list_node);
1431 gpd_data = to_gpd_data(pdd);
1432 if (--gpd_data->refcount == 0) {
1433 dev->power.subsys_data->domain_data = NULL;
1437 spin_unlock_irq(&dev->power.lock);
1439 mutex_lock(&gpd_data->lock);
1441 mutex_unlock(&gpd_data->lock);
1443 genpd_release_lock(genpd);
1445 dev_pm_put_subsys_data(dev);
1447 __pm_genpd_free_dev_data(dev, gpd_data);
1452 genpd_release_lock(genpd);
1458 * pm_genpd_dev_always_on - Set/unset the "always on" flag for a given device.
1459 * @dev: Device to set/unset the flag for.
1460 * @val: The new value of the device's "always on" flag.
1462 void pm_genpd_dev_always_on(struct device *dev, bool val)
1464 struct pm_subsys_data *psd;
1465 unsigned long flags;
1467 spin_lock_irqsave(&dev->power.lock, flags);
1469 psd = dev_to_psd(dev);
1470 if (psd && psd->domain_data)
1471 to_gpd_data(psd->domain_data)->always_on = val;
1473 spin_unlock_irqrestore(&dev->power.lock, flags);
1475 EXPORT_SYMBOL_GPL(pm_genpd_dev_always_on);
1478 * pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag.
1479 * @dev: Device to set/unset the flag for.
1480 * @val: The new value of the device's "need restore" flag.
1482 void pm_genpd_dev_need_restore(struct device *dev, bool val)
1484 struct pm_subsys_data *psd;
1485 unsigned long flags;
1487 spin_lock_irqsave(&dev->power.lock, flags);
1489 psd = dev_to_psd(dev);
1490 if (psd && psd->domain_data)
1491 to_gpd_data(psd->domain_data)->need_restore = val;
1493 spin_unlock_irqrestore(&dev->power.lock, flags);
1495 EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore);
1498 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
1499 * @genpd: Master PM domain to add the subdomain to.
1500 * @subdomain: Subdomain to be added.
1502 int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
1503 struct generic_pm_domain *subdomain)
1505 struct gpd_link *link;
1508 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
1512 genpd_acquire_lock(genpd);
1513 mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
1515 if (subdomain->status != GPD_STATE_POWER_OFF
1516 && subdomain->status != GPD_STATE_ACTIVE) {
1517 mutex_unlock(&subdomain->lock);
1518 genpd_release_lock(genpd);
1522 if (genpd->status == GPD_STATE_POWER_OFF
1523 && subdomain->status != GPD_STATE_POWER_OFF) {
1528 list_for_each_entry(link, &genpd->master_links, master_node) {
1529 if (link->slave == subdomain && link->master == genpd) {
1535 link = kzalloc(sizeof(*link), GFP_KERNEL);
1540 link->master = genpd;
1541 list_add_tail(&link->master_node, &genpd->master_links);
1542 link->slave = subdomain;
1543 list_add_tail(&link->slave_node, &subdomain->slave_links);
1544 if (subdomain->status != GPD_STATE_POWER_OFF)
1545 genpd_sd_counter_inc(genpd);
1548 mutex_unlock(&subdomain->lock);
1549 genpd_release_lock(genpd);
1555 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
1556 * @genpd: Master PM domain to remove the subdomain from.
1557 * @subdomain: Subdomain to be removed.
1559 int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
1560 struct generic_pm_domain *subdomain)
1562 struct gpd_link *link;
1565 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
1569 genpd_acquire_lock(genpd);
1571 list_for_each_entry(link, &genpd->master_links, master_node) {
1572 if (link->slave != subdomain)
1575 mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
1577 if (subdomain->status != GPD_STATE_POWER_OFF
1578 && subdomain->status != GPD_STATE_ACTIVE) {
1579 mutex_unlock(&subdomain->lock);
1580 genpd_release_lock(genpd);
1584 list_del(&link->master_node);
1585 list_del(&link->slave_node);
1587 if (subdomain->status != GPD_STATE_POWER_OFF)
1588 genpd_sd_counter_dec(genpd);
1590 mutex_unlock(&subdomain->lock);
1596 genpd_release_lock(genpd);
1602 * pm_genpd_add_callbacks - Add PM domain callbacks to a given device.
1603 * @dev: Device to add the callbacks to.
1604 * @ops: Set of callbacks to add.
1605 * @td: Timing data to add to the device along with the callbacks (optional).
1607 * Every call to this routine should be balanced with a call to
1608 * __pm_genpd_remove_callbacks() and they must not be nested.
1610 int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops,
1611 struct gpd_timing_data *td)
1613 struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL;
1619 gpd_data_new = __pm_genpd_alloc_dev_data(dev);
1623 pm_runtime_disable(dev);
1626 ret = dev_pm_get_subsys_data(dev);
1630 spin_lock_irq(&dev->power.lock);
1632 if (dev->power.subsys_data->domain_data) {
1633 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
1635 gpd_data = gpd_data_new;
1636 dev->power.subsys_data->domain_data = &gpd_data->base;
1638 gpd_data->refcount++;
1639 gpd_data->ops = *ops;
1643 spin_unlock_irq(&dev->power.lock);
1647 pm_runtime_enable(dev);
1649 if (gpd_data != gpd_data_new)
1650 __pm_genpd_free_dev_data(dev, gpd_data_new);
1654 EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks);
1657 * __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device.
1658 * @dev: Device to remove the callbacks from.
1659 * @clear_td: If set, clear the device's timing data too.
1661 * This routine can only be called after pm_genpd_add_callbacks().
1663 int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
1665 struct generic_pm_domain_data *gpd_data = NULL;
1666 bool remove = false;
1669 if (!(dev && dev->power.subsys_data))
1672 pm_runtime_disable(dev);
1675 spin_lock_irq(&dev->power.lock);
1677 if (dev->power.subsys_data->domain_data) {
1678 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
1679 gpd_data->ops = (struct gpd_dev_ops){ NULL };
1681 gpd_data->td = (struct gpd_timing_data){ 0 };
1683 if (--gpd_data->refcount == 0) {
1684 dev->power.subsys_data->domain_data = NULL;
1691 spin_unlock_irq(&dev->power.lock);
1694 pm_runtime_enable(dev);
1699 dev_pm_put_subsys_data(dev);
1701 __pm_genpd_free_dev_data(dev, gpd_data);
1705 EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks);
1707 int genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state)
1709 struct cpuidle_driver *cpuidle_drv;
1710 struct gpd_cpu_data *cpu_data;
1711 struct cpuidle_state *idle_state;
1714 if (IS_ERR_OR_NULL(genpd) || state < 0)
1717 genpd_acquire_lock(genpd);
1719 if (genpd->cpu_data) {
1723 cpu_data = kzalloc(sizeof(*cpu_data), GFP_KERNEL);
1728 cpuidle_drv = cpuidle_driver_ref();
1733 if (cpuidle_drv->state_count <= state) {
1737 idle_state = &cpuidle_drv->states[state];
1738 if (!idle_state->disabled) {
1742 cpu_data->idle_state = idle_state;
1743 cpu_data->saved_exit_latency = idle_state->exit_latency;
1744 genpd->cpu_data = cpu_data;
1745 genpd_recalc_cpu_exit_latency(genpd);
1748 genpd_release_lock(genpd);
1752 cpuidle_driver_unref();
1756 int genpd_detach_cpuidle(struct generic_pm_domain *genpd)
1758 struct gpd_cpu_data *cpu_data;
1759 struct cpuidle_state *idle_state;
1762 if (IS_ERR_OR_NULL(genpd))
1765 genpd_acquire_lock(genpd);
1767 cpu_data = genpd->cpu_data;
1772 idle_state = cpu_data->idle_state;
1773 if (!idle_state->disabled) {
1777 idle_state->exit_latency = cpu_data->saved_exit_latency;
1778 cpuidle_driver_unref();
1779 genpd->cpu_data = NULL;
1783 genpd_release_lock(genpd);
1787 /* Default device callbacks for generic PM domains. */
1790 * pm_genpd_default_save_state - Default "save device state" for PM domians.
1791 * @dev: Device to handle.
1793 static int pm_genpd_default_save_state(struct device *dev)
1795 int (*cb)(struct device *__dev);
1797 cb = dev_gpd_data(dev)->ops.save_state;
1801 if (dev->type && dev->type->pm)
1802 cb = dev->type->pm->runtime_suspend;
1803 else if (dev->class && dev->class->pm)
1804 cb = dev->class->pm->runtime_suspend;
1805 else if (dev->bus && dev->bus->pm)
1806 cb = dev->bus->pm->runtime_suspend;
1810 if (!cb && dev->driver && dev->driver->pm)
1811 cb = dev->driver->pm->runtime_suspend;
1813 return cb ? cb(dev) : 0;
1817 * pm_genpd_default_restore_state - Default PM domians "restore device state".
1818 * @dev: Device to handle.
1820 static int pm_genpd_default_restore_state(struct device *dev)
1822 int (*cb)(struct device *__dev);
1824 cb = dev_gpd_data(dev)->ops.restore_state;
1828 if (dev->type && dev->type->pm)
1829 cb = dev->type->pm->runtime_resume;
1830 else if (dev->class && dev->class->pm)
1831 cb = dev->class->pm->runtime_resume;
1832 else if (dev->bus && dev->bus->pm)
1833 cb = dev->bus->pm->runtime_resume;
1837 if (!cb && dev->driver && dev->driver->pm)
1838 cb = dev->driver->pm->runtime_resume;
1840 return cb ? cb(dev) : 0;
1843 #ifdef CONFIG_PM_SLEEP
1846 * pm_genpd_default_suspend - Default "device suspend" for PM domians.
1847 * @dev: Device to handle.
1849 static int pm_genpd_default_suspend(struct device *dev)
1851 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend;
1853 return cb ? cb(dev) : pm_generic_suspend(dev);
1857 * pm_genpd_default_suspend_late - Default "late device suspend" for PM domians.
1858 * @dev: Device to handle.
1860 static int pm_genpd_default_suspend_late(struct device *dev)
1862 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend_late;
1864 return cb ? cb(dev) : pm_generic_suspend_late(dev);
1868 * pm_genpd_default_resume_early - Default "early device resume" for PM domians.
1869 * @dev: Device to handle.
1871 static int pm_genpd_default_resume_early(struct device *dev)
1873 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume_early;
1875 return cb ? cb(dev) : pm_generic_resume_early(dev);
1879 * pm_genpd_default_resume - Default "device resume" for PM domians.
1880 * @dev: Device to handle.
1882 static int pm_genpd_default_resume(struct device *dev)
1884 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume;
1886 return cb ? cb(dev) : pm_generic_resume(dev);
1890 * pm_genpd_default_freeze - Default "device freeze" for PM domians.
1891 * @dev: Device to handle.
1893 static int pm_genpd_default_freeze(struct device *dev)
1895 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze;
1897 return cb ? cb(dev) : pm_generic_freeze(dev);
1901 * pm_genpd_default_freeze_late - Default "late device freeze" for PM domians.
1902 * @dev: Device to handle.
1904 static int pm_genpd_default_freeze_late(struct device *dev)
1906 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late;
1908 return cb ? cb(dev) : pm_generic_freeze_late(dev);
1912 * pm_genpd_default_thaw_early - Default "early device thaw" for PM domians.
1913 * @dev: Device to handle.
1915 static int pm_genpd_default_thaw_early(struct device *dev)
1917 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early;
1919 return cb ? cb(dev) : pm_generic_thaw_early(dev);
1923 * pm_genpd_default_thaw - Default "device thaw" for PM domians.
1924 * @dev: Device to handle.
1926 static int pm_genpd_default_thaw(struct device *dev)
1928 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw;
1930 return cb ? cb(dev) : pm_generic_thaw(dev);
1933 #else /* !CONFIG_PM_SLEEP */
1935 #define pm_genpd_default_suspend NULL
1936 #define pm_genpd_default_suspend_late NULL
1937 #define pm_genpd_default_resume_early NULL
1938 #define pm_genpd_default_resume NULL
1939 #define pm_genpd_default_freeze NULL
1940 #define pm_genpd_default_freeze_late NULL
1941 #define pm_genpd_default_thaw_early NULL
1942 #define pm_genpd_default_thaw NULL
1944 #endif /* !CONFIG_PM_SLEEP */
1947 * pm_genpd_init - Initialize a generic I/O PM domain object.
1948 * @genpd: PM domain object to initialize.
1949 * @gov: PM domain governor to associate with the domain (may be NULL).
1950 * @is_off: Initial value of the domain's power_is_off field.
1952 void pm_genpd_init(struct generic_pm_domain *genpd,
1953 struct dev_power_governor *gov, bool is_off)
1955 if (IS_ERR_OR_NULL(genpd))
1958 INIT_LIST_HEAD(&genpd->master_links);
1959 INIT_LIST_HEAD(&genpd->slave_links);
1960 INIT_LIST_HEAD(&genpd->dev_list);
1961 mutex_init(&genpd->lock);
1963 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
1964 genpd->in_progress = 0;
1965 atomic_set(&genpd->sd_count, 0);
1966 genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
1967 init_waitqueue_head(&genpd->status_wait_queue);
1968 genpd->poweroff_task = NULL;
1969 genpd->resume_count = 0;
1970 genpd->device_count = 0;
1971 genpd->max_off_time_ns = -1;
1972 genpd->max_off_time_changed = true;
1973 genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
1974 genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;
1975 genpd->domain.ops.runtime_idle = pm_generic_runtime_idle;
1976 genpd->domain.ops.prepare = pm_genpd_prepare;
1977 genpd->domain.ops.suspend = pm_genpd_suspend;
1978 genpd->domain.ops.suspend_late = pm_genpd_suspend_late;
1979 genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq;
1980 genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq;
1981 genpd->domain.ops.resume_early = pm_genpd_resume_early;
1982 genpd->domain.ops.resume = pm_genpd_resume;
1983 genpd->domain.ops.freeze = pm_genpd_freeze;
1984 genpd->domain.ops.freeze_late = pm_genpd_freeze_late;
1985 genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq;
1986 genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq;
1987 genpd->domain.ops.thaw_early = pm_genpd_thaw_early;
1988 genpd->domain.ops.thaw = pm_genpd_thaw;
1989 genpd->domain.ops.poweroff = pm_genpd_suspend;
1990 genpd->domain.ops.poweroff_late = pm_genpd_suspend_late;
1991 genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq;
1992 genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
1993 genpd->domain.ops.restore_early = pm_genpd_resume_early;
1994 genpd->domain.ops.restore = pm_genpd_resume;
1995 genpd->domain.ops.complete = pm_genpd_complete;
1996 genpd->dev_ops.save_state = pm_genpd_default_save_state;
1997 genpd->dev_ops.restore_state = pm_genpd_default_restore_state;
1998 genpd->dev_ops.suspend = pm_genpd_default_suspend;
1999 genpd->dev_ops.suspend_late = pm_genpd_default_suspend_late;
2000 genpd->dev_ops.resume_early = pm_genpd_default_resume_early;
2001 genpd->dev_ops.resume = pm_genpd_default_resume;
2002 genpd->dev_ops.freeze = pm_genpd_default_freeze;
2003 genpd->dev_ops.freeze_late = pm_genpd_default_freeze_late;
2004 genpd->dev_ops.thaw_early = pm_genpd_default_thaw_early;
2005 genpd->dev_ops.thaw = pm_genpd_default_thaw;
2006 mutex_lock(&gpd_list_lock);
2007 list_add(&genpd->gpd_list_node, &gpd_list);
2008 mutex_unlock(&gpd_list_lock);