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/delay.h>
10 #include <linux/kernel.h>
12 #include <linux/platform_device.h>
13 #include <linux/pm_runtime.h>
14 #include <linux/pm_domain.h>
15 #include <linux/pm_qos.h>
16 #include <linux/pm_clock.h>
17 #include <linux/slab.h>
18 #include <linux/err.h>
19 #include <linux/sched.h>
20 #include <linux/suspend.h>
21 #include <linux/export.h>
25 #define GENPD_RETRY_MAX_MS 250 /* Approximate */
27 #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \
29 type (*__routine)(struct device *__d); \
30 type __ret = (type)0; \
32 __routine = genpd->dev_ops.callback; \
34 __ret = __routine(dev); \
39 static LIST_HEAD(gpd_list);
40 static DEFINE_MUTEX(gpd_list_lock);
43 * Get the generic PM domain for a particular struct device.
44 * This validates the struct device pointer, the PM domain pointer,
45 * and checks that the PM domain pointer is a real generic PM domain.
46 * Any failure results in NULL being returned.
48 struct generic_pm_domain *pm_genpd_lookup_dev(struct device *dev)
50 struct generic_pm_domain *genpd = NULL, *gpd;
52 if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain))
55 mutex_lock(&gpd_list_lock);
56 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
57 if (&gpd->domain == dev->pm_domain) {
62 mutex_unlock(&gpd_list_lock);
68 * This should only be used where we are certain that the pm_domain
69 * attached to the device is a genpd domain.
71 static struct generic_pm_domain *dev_to_genpd(struct device *dev)
73 if (IS_ERR_OR_NULL(dev->pm_domain))
74 return ERR_PTR(-EINVAL);
76 return pd_to_genpd(dev->pm_domain);
79 static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev)
81 return GENPD_DEV_CALLBACK(genpd, int, stop, dev);
84 static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev)
86 return GENPD_DEV_CALLBACK(genpd, int, start, dev);
89 static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
93 if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
94 ret = !!atomic_dec_and_test(&genpd->sd_count);
99 static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
101 atomic_inc(&genpd->sd_count);
102 smp_mb__after_atomic();
105 static int genpd_power_on(struct generic_pm_domain *genpd, bool timed)
107 unsigned int state_idx = genpd->state_idx;
112 if (!genpd->power_on)
116 return genpd->power_on(genpd);
118 time_start = ktime_get();
119 ret = genpd->power_on(genpd);
123 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
124 if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns)
127 genpd->states[state_idx].power_on_latency_ns = elapsed_ns;
128 genpd->max_off_time_changed = true;
129 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
130 genpd->name, "on", elapsed_ns);
135 static int genpd_power_off(struct generic_pm_domain *genpd, bool timed)
137 unsigned int state_idx = genpd->state_idx;
142 if (!genpd->power_off)
146 return genpd->power_off(genpd);
148 time_start = ktime_get();
149 ret = genpd->power_off(genpd);
153 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
154 if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns)
157 genpd->states[state_idx].power_off_latency_ns = elapsed_ns;
158 genpd->max_off_time_changed = true;
159 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
160 genpd->name, "off", elapsed_ns);
166 * genpd_queue_power_off_work - Queue up the execution of genpd_poweroff().
167 * @genpd: PM domain to power off.
169 * Queue up the execution of genpd_poweroff() unless it's already been done
172 static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
174 queue_work(pm_wq, &genpd->power_off_work);
178 * genpd_poweron - Restore power to a given PM domain and its masters.
179 * @genpd: PM domain to power up.
180 * @depth: nesting count for lockdep.
182 * Restore power to @genpd and all of its masters so that it is possible to
183 * resume a device belonging to it.
185 static int genpd_poweron(struct generic_pm_domain *genpd, unsigned int depth)
187 struct gpd_link *link;
190 if (genpd->status == GPD_STATE_ACTIVE)
194 * The list is guaranteed not to change while the loop below is being
195 * executed, unless one of the masters' .power_on() callbacks fiddles
198 list_for_each_entry(link, &genpd->slave_links, slave_node) {
199 struct generic_pm_domain *master = link->master;
201 genpd_sd_counter_inc(master);
203 mutex_lock_nested(&master->lock, depth + 1);
204 ret = genpd_poweron(master, depth + 1);
205 mutex_unlock(&master->lock);
208 genpd_sd_counter_dec(master);
213 ret = genpd_power_on(genpd, true);
217 genpd->status = GPD_STATE_ACTIVE;
221 list_for_each_entry_continue_reverse(link,
224 genpd_sd_counter_dec(link->master);
225 genpd_queue_power_off_work(link->master);
231 static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
232 unsigned long val, void *ptr)
234 struct generic_pm_domain_data *gpd_data;
237 gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
238 dev = gpd_data->base.dev;
241 struct generic_pm_domain *genpd;
242 struct pm_domain_data *pdd;
244 spin_lock_irq(&dev->power.lock);
246 pdd = dev->power.subsys_data ?
247 dev->power.subsys_data->domain_data : NULL;
248 if (pdd && pdd->dev) {
249 to_gpd_data(pdd)->td.constraint_changed = true;
250 genpd = dev_to_genpd(dev);
252 genpd = ERR_PTR(-ENODATA);
255 spin_unlock_irq(&dev->power.lock);
257 if (!IS_ERR(genpd)) {
258 mutex_lock(&genpd->lock);
259 genpd->max_off_time_changed = true;
260 mutex_unlock(&genpd->lock);
264 if (!dev || dev->power.ignore_children)
272 * genpd_poweroff - Remove power from a given PM domain.
273 * @genpd: PM domain to power down.
274 * @is_async: PM domain is powered down from a scheduled work
276 * If all of the @genpd's devices have been suspended and all of its subdomains
277 * have been powered down, remove power from @genpd.
279 static int genpd_poweroff(struct generic_pm_domain *genpd, bool is_async)
281 struct pm_domain_data *pdd;
282 struct gpd_link *link;
283 unsigned int not_suspended = 0;
286 * Do not try to power off the domain in the following situations:
287 * (1) The domain is already in the "power off" state.
288 * (2) System suspend is in progress.
290 if (genpd->status == GPD_STATE_POWER_OFF
291 || genpd->prepared_count > 0)
294 if (atomic_read(&genpd->sd_count) > 0)
297 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
298 enum pm_qos_flags_status stat;
300 stat = dev_pm_qos_flags(pdd->dev,
301 PM_QOS_FLAG_NO_POWER_OFF
302 | PM_QOS_FLAG_REMOTE_WAKEUP);
303 if (stat > PM_QOS_FLAGS_NONE)
306 if (!pm_runtime_suspended(pdd->dev) || pdd->dev->power.irq_safe)
310 if (not_suspended > 1 || (not_suspended == 1 && is_async))
313 if (genpd->gov && genpd->gov->power_down_ok) {
314 if (!genpd->gov->power_down_ok(&genpd->domain))
318 if (genpd->power_off) {
321 if (atomic_read(&genpd->sd_count) > 0)
325 * If sd_count > 0 at this point, one of the subdomains hasn't
326 * managed to call genpd_poweron() for the master yet after
327 * incrementing it. In that case genpd_poweron() will wait
328 * for us to drop the lock, so we can call .power_off() and let
329 * the genpd_poweron() restore power for us (this shouldn't
330 * happen very often).
332 ret = genpd_power_off(genpd, true);
337 genpd->status = GPD_STATE_POWER_OFF;
339 list_for_each_entry(link, &genpd->slave_links, slave_node) {
340 genpd_sd_counter_dec(link->master);
341 genpd_queue_power_off_work(link->master);
348 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
349 * @work: Work structure used for scheduling the execution of this function.
351 static void genpd_power_off_work_fn(struct work_struct *work)
353 struct generic_pm_domain *genpd;
355 genpd = container_of(work, struct generic_pm_domain, power_off_work);
357 mutex_lock(&genpd->lock);
358 genpd_poweroff(genpd, true);
359 mutex_unlock(&genpd->lock);
363 * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks
364 * @dev: Device to handle.
366 static int __genpd_runtime_suspend(struct device *dev)
368 int (*cb)(struct device *__dev);
370 if (dev->type && dev->type->pm)
371 cb = dev->type->pm->runtime_suspend;
372 else if (dev->class && dev->class->pm)
373 cb = dev->class->pm->runtime_suspend;
374 else if (dev->bus && dev->bus->pm)
375 cb = dev->bus->pm->runtime_suspend;
379 if (!cb && dev->driver && dev->driver->pm)
380 cb = dev->driver->pm->runtime_suspend;
382 return cb ? cb(dev) : 0;
386 * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks
387 * @dev: Device to handle.
389 static int __genpd_runtime_resume(struct device *dev)
391 int (*cb)(struct device *__dev);
393 if (dev->type && dev->type->pm)
394 cb = dev->type->pm->runtime_resume;
395 else if (dev->class && dev->class->pm)
396 cb = dev->class->pm->runtime_resume;
397 else if (dev->bus && dev->bus->pm)
398 cb = dev->bus->pm->runtime_resume;
402 if (!cb && dev->driver && dev->driver->pm)
403 cb = dev->driver->pm->runtime_resume;
405 return cb ? cb(dev) : 0;
409 * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
410 * @dev: Device to suspend.
412 * Carry out a runtime suspend of a device under the assumption that its
413 * pm_domain field points to the domain member of an object of type
414 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
416 static int genpd_runtime_suspend(struct device *dev)
418 struct generic_pm_domain *genpd;
419 bool (*suspend_ok)(struct device *__dev);
420 struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
421 bool runtime_pm = pm_runtime_enabled(dev);
426 dev_dbg(dev, "%s()\n", __func__);
428 genpd = dev_to_genpd(dev);
433 * A runtime PM centric subsystem/driver may re-use the runtime PM
434 * callbacks for other purposes than runtime PM. In those scenarios
435 * runtime PM is disabled. Under these circumstances, we shall skip
436 * validating/measuring the PM QoS latency.
438 suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL;
439 if (runtime_pm && suspend_ok && !suspend_ok(dev))
442 /* Measure suspend latency. */
444 time_start = ktime_get();
446 ret = __genpd_runtime_suspend(dev);
450 ret = genpd_stop_dev(genpd, dev);
452 __genpd_runtime_resume(dev);
456 /* Update suspend latency value if the measured time exceeds it. */
458 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
459 if (elapsed_ns > td->suspend_latency_ns) {
460 td->suspend_latency_ns = elapsed_ns;
461 dev_dbg(dev, "suspend latency exceeded, %lld ns\n",
463 genpd->max_off_time_changed = true;
464 td->constraint_changed = true;
469 * If power.irq_safe is set, this routine will be run with interrupts
470 * off, so it can't use mutexes.
472 if (dev->power.irq_safe)
475 mutex_lock(&genpd->lock);
476 genpd_poweroff(genpd, false);
477 mutex_unlock(&genpd->lock);
483 * genpd_runtime_resume - Resume a device belonging to I/O PM domain.
484 * @dev: Device to resume.
486 * Carry out a runtime resume of a device under the assumption that its
487 * pm_domain field points to the domain member of an object of type
488 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
490 static int genpd_runtime_resume(struct device *dev)
492 struct generic_pm_domain *genpd;
493 struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
494 bool runtime_pm = pm_runtime_enabled(dev);
500 dev_dbg(dev, "%s()\n", __func__);
502 genpd = dev_to_genpd(dev);
506 /* If power.irq_safe, the PM domain is never powered off. */
507 if (dev->power.irq_safe) {
512 mutex_lock(&genpd->lock);
513 ret = genpd_poweron(genpd, 0);
514 mutex_unlock(&genpd->lock);
520 /* Measure resume latency. */
521 if (timed && runtime_pm)
522 time_start = ktime_get();
524 ret = genpd_start_dev(genpd, dev);
528 ret = __genpd_runtime_resume(dev);
532 /* Update resume latency value if the measured time exceeds it. */
533 if (timed && runtime_pm) {
534 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
535 if (elapsed_ns > td->resume_latency_ns) {
536 td->resume_latency_ns = elapsed_ns;
537 dev_dbg(dev, "resume latency exceeded, %lld ns\n",
539 genpd->max_off_time_changed = true;
540 td->constraint_changed = true;
547 genpd_stop_dev(genpd, dev);
549 if (!dev->power.irq_safe) {
550 mutex_lock(&genpd->lock);
551 genpd_poweroff(genpd, 0);
552 mutex_unlock(&genpd->lock);
558 static bool pd_ignore_unused;
559 static int __init pd_ignore_unused_setup(char *__unused)
561 pd_ignore_unused = true;
564 __setup("pd_ignore_unused", pd_ignore_unused_setup);
567 * genpd_poweroff_unused - Power off all PM domains with no devices in use.
569 static int __init genpd_poweroff_unused(void)
571 struct generic_pm_domain *genpd;
573 if (pd_ignore_unused) {
574 pr_warn("genpd: Not disabling unused power domains\n");
578 mutex_lock(&gpd_list_lock);
580 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
581 genpd_queue_power_off_work(genpd);
583 mutex_unlock(&gpd_list_lock);
587 late_initcall(genpd_poweroff_unused);
589 #ifdef CONFIG_PM_SLEEP
592 * pm_genpd_present - Check if the given PM domain has been initialized.
593 * @genpd: PM domain to check.
595 static bool pm_genpd_present(const struct generic_pm_domain *genpd)
597 const struct generic_pm_domain *gpd;
599 if (IS_ERR_OR_NULL(genpd))
602 list_for_each_entry(gpd, &gpd_list, gpd_list_node)
609 static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd,
612 return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev);
616 * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters.
617 * @genpd: PM domain to power off, if possible.
618 * @timed: True if latency measurements are allowed.
620 * Check if the given PM domain can be powered off (during system suspend or
621 * hibernation) and do that if so. Also, in that case propagate to its masters.
623 * This function is only called in "noirq" and "syscore" stages of system power
624 * transitions, so it need not acquire locks (all of the "noirq" callbacks are
625 * executed sequentially, so it is guaranteed that it will never run twice in
628 static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd,
631 struct gpd_link *link;
633 if (genpd->status == GPD_STATE_POWER_OFF)
636 if (genpd->suspended_count != genpd->device_count
637 || atomic_read(&genpd->sd_count) > 0)
640 /* Choose the deepest state when suspending */
641 genpd->state_idx = genpd->state_count - 1;
642 genpd_power_off(genpd, timed);
644 genpd->status = GPD_STATE_POWER_OFF;
646 list_for_each_entry(link, &genpd->slave_links, slave_node) {
647 genpd_sd_counter_dec(link->master);
648 pm_genpd_sync_poweroff(link->master, timed);
653 * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters.
654 * @genpd: PM domain to power on.
655 * @timed: True if latency measurements are allowed.
657 * This function is only called in "noirq" and "syscore" stages of system power
658 * transitions, so it need not acquire locks (all of the "noirq" callbacks are
659 * executed sequentially, so it is guaranteed that it will never run twice in
662 static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd,
665 struct gpd_link *link;
667 if (genpd->status == GPD_STATE_ACTIVE)
670 list_for_each_entry(link, &genpd->slave_links, slave_node) {
671 pm_genpd_sync_poweron(link->master, timed);
672 genpd_sd_counter_inc(link->master);
675 genpd_power_on(genpd, timed);
677 genpd->status = GPD_STATE_ACTIVE;
681 * resume_needed - Check whether to resume a device before system suspend.
682 * @dev: Device to check.
683 * @genpd: PM domain the device belongs to.
685 * There are two cases in which a device that can wake up the system from sleep
686 * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled
687 * to wake up the system and it has to remain active for this purpose while the
688 * system is in the sleep state and (2) if the device is not enabled to wake up
689 * the system from sleep states and it generally doesn't generate wakeup signals
690 * by itself (those signals are generated on its behalf by other parts of the
691 * system). In the latter case it may be necessary to reconfigure the device's
692 * wakeup settings during system suspend, because it may have been set up to
693 * signal remote wakeup from the system's working state as needed by runtime PM.
694 * Return 'true' in either of the above cases.
696 static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd)
700 if (!device_can_wakeup(dev))
703 active_wakeup = genpd_dev_active_wakeup(genpd, dev);
704 return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
708 * pm_genpd_prepare - Start power transition of a device in a PM domain.
709 * @dev: Device to start the transition of.
711 * Start a power transition of a device (during a system-wide power transition)
712 * under the assumption that its pm_domain field points to the domain member of
713 * an object of type struct generic_pm_domain representing a PM domain
714 * consisting of I/O devices.
716 static int pm_genpd_prepare(struct device *dev)
718 struct generic_pm_domain *genpd;
721 dev_dbg(dev, "%s()\n", __func__);
723 genpd = dev_to_genpd(dev);
728 * If a wakeup request is pending for the device, it should be woken up
729 * at this point and a system wakeup event should be reported if it's
730 * set up to wake up the system from sleep states.
732 if (resume_needed(dev, genpd))
733 pm_runtime_resume(dev);
735 mutex_lock(&genpd->lock);
737 if (genpd->prepared_count++ == 0)
738 genpd->suspended_count = 0;
740 mutex_unlock(&genpd->lock);
743 * Even if the PM domain is powered off at this point, we can't expect
744 * it to remain in that state during the entire system PM suspend
745 * phase. Any subsystem/driver for a device in the PM domain, may still
746 * need to serve a request which may require the device to be runtime
747 * resumed and its PM domain to be powered.
749 * As we are disabling runtime PM at this point, we are preventing the
750 * subsystem/driver to decide themselves. For that reason, we need to
751 * make sure the device is operational as it may be required in some
754 pm_runtime_resume(dev);
755 __pm_runtime_disable(dev, false);
757 ret = pm_generic_prepare(dev);
759 mutex_lock(&genpd->lock);
761 genpd->prepared_count--;
763 mutex_unlock(&genpd->lock);
764 pm_runtime_enable(dev);
771 * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
772 * @dev: Device to suspend.
774 * Stop the device and remove power from the domain if all devices in it have
777 static int pm_genpd_suspend_noirq(struct device *dev)
779 struct generic_pm_domain *genpd;
781 dev_dbg(dev, "%s()\n", __func__);
783 genpd = dev_to_genpd(dev);
787 if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))
790 genpd_stop_dev(genpd, dev);
793 * Since all of the "noirq" callbacks are executed sequentially, it is
794 * guaranteed that this function will never run twice in parallel for
795 * the same PM domain, so it is not necessary to use locking here.
797 genpd->suspended_count++;
798 pm_genpd_sync_poweroff(genpd, true);
804 * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain.
805 * @dev: Device to resume.
807 * Restore power to the device's PM domain, if necessary, and start the device.
809 static int pm_genpd_resume_noirq(struct device *dev)
811 struct generic_pm_domain *genpd;
813 dev_dbg(dev, "%s()\n", __func__);
815 genpd = dev_to_genpd(dev);
819 if (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))
823 * Since all of the "noirq" callbacks are executed sequentially, it is
824 * guaranteed that this function will never run twice in parallel for
825 * the same PM domain, so it is not necessary to use locking here.
827 pm_genpd_sync_poweron(genpd, true);
828 genpd->suspended_count--;
830 return genpd_start_dev(genpd, dev);
834 * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
835 * @dev: Device to freeze.
837 * Carry out a late freeze of a device under the assumption that its
838 * pm_domain field points to the domain member of an object of type
839 * struct generic_pm_domain representing a power domain consisting of I/O
842 static int pm_genpd_freeze_noirq(struct device *dev)
844 struct generic_pm_domain *genpd;
846 dev_dbg(dev, "%s()\n", __func__);
848 genpd = dev_to_genpd(dev);
852 return genpd_stop_dev(genpd, dev);
856 * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
857 * @dev: Device to thaw.
859 * Start the device, unless power has been removed from the domain already
860 * before the system transition.
862 static int pm_genpd_thaw_noirq(struct device *dev)
864 struct generic_pm_domain *genpd;
866 dev_dbg(dev, "%s()\n", __func__);
868 genpd = dev_to_genpd(dev);
872 return genpd_start_dev(genpd, dev);
876 * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain.
877 * @dev: Device to resume.
879 * Make sure the domain will be in the same power state as before the
880 * hibernation the system is resuming from and start the device if necessary.
882 static int pm_genpd_restore_noirq(struct device *dev)
884 struct generic_pm_domain *genpd;
886 dev_dbg(dev, "%s()\n", __func__);
888 genpd = dev_to_genpd(dev);
893 * Since all of the "noirq" callbacks are executed sequentially, it is
894 * guaranteed that this function will never run twice in parallel for
895 * the same PM domain, so it is not necessary to use locking here.
897 * At this point suspended_count == 0 means we are being run for the
898 * first time for the given domain in the present cycle.
900 if (genpd->suspended_count++ == 0)
902 * The boot kernel might put the domain into arbitrary state,
903 * so make it appear as powered off to pm_genpd_sync_poweron(),
904 * so that it tries to power it on in case it was really off.
906 genpd->status = GPD_STATE_POWER_OFF;
908 pm_genpd_sync_poweron(genpd, true);
910 return genpd_start_dev(genpd, dev);
914 * pm_genpd_complete - Complete power transition of a device in a power domain.
915 * @dev: Device to complete the transition of.
917 * Complete a power transition of a device (during a system-wide power
918 * transition) under the assumption that its pm_domain field points to the
919 * domain member of an object of type struct generic_pm_domain representing
920 * a power domain consisting of I/O devices.
922 static void pm_genpd_complete(struct device *dev)
924 struct generic_pm_domain *genpd;
926 dev_dbg(dev, "%s()\n", __func__);
928 genpd = dev_to_genpd(dev);
932 mutex_lock(&genpd->lock);
934 genpd->prepared_count--;
936 mutex_unlock(&genpd->lock);
938 pm_generic_complete(dev);
939 pm_runtime_set_active(dev);
940 pm_runtime_enable(dev);
941 pm_request_idle(dev);
945 * genpd_syscore_switch - Switch power during system core suspend or resume.
946 * @dev: Device that normally is marked as "always on" to switch power for.
948 * This routine may only be called during the system core (syscore) suspend or
949 * resume phase for devices whose "always on" flags are set.
951 static void genpd_syscore_switch(struct device *dev, bool suspend)
953 struct generic_pm_domain *genpd;
955 genpd = dev_to_genpd(dev);
956 if (!pm_genpd_present(genpd))
960 genpd->suspended_count++;
961 pm_genpd_sync_poweroff(genpd, false);
963 pm_genpd_sync_poweron(genpd, false);
964 genpd->suspended_count--;
968 void pm_genpd_syscore_poweroff(struct device *dev)
970 genpd_syscore_switch(dev, true);
972 EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff);
974 void pm_genpd_syscore_poweron(struct device *dev)
976 genpd_syscore_switch(dev, false);
978 EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron);
980 #else /* !CONFIG_PM_SLEEP */
982 #define pm_genpd_prepare NULL
983 #define pm_genpd_suspend_noirq NULL
984 #define pm_genpd_resume_noirq NULL
985 #define pm_genpd_freeze_noirq NULL
986 #define pm_genpd_thaw_noirq NULL
987 #define pm_genpd_restore_noirq NULL
988 #define pm_genpd_complete NULL
990 #endif /* CONFIG_PM_SLEEP */
992 static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev,
993 struct generic_pm_domain *genpd,
994 struct gpd_timing_data *td)
996 struct generic_pm_domain_data *gpd_data;
999 ret = dev_pm_get_subsys_data(dev);
1001 return ERR_PTR(ret);
1003 gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
1012 gpd_data->base.dev = dev;
1013 gpd_data->td.constraint_changed = true;
1014 gpd_data->td.effective_constraint_ns = -1;
1015 gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
1017 spin_lock_irq(&dev->power.lock);
1019 if (dev->power.subsys_data->domain_data) {
1024 dev->power.subsys_data->domain_data = &gpd_data->base;
1026 spin_unlock_irq(&dev->power.lock);
1028 dev_pm_domain_set(dev, &genpd->domain);
1033 spin_unlock_irq(&dev->power.lock);
1036 dev_pm_put_subsys_data(dev);
1037 return ERR_PTR(ret);
1040 static void genpd_free_dev_data(struct device *dev,
1041 struct generic_pm_domain_data *gpd_data)
1043 dev_pm_domain_set(dev, NULL);
1045 spin_lock_irq(&dev->power.lock);
1047 dev->power.subsys_data->domain_data = NULL;
1049 spin_unlock_irq(&dev->power.lock);
1052 dev_pm_put_subsys_data(dev);
1056 * __pm_genpd_add_device - Add a device to an I/O PM domain.
1057 * @genpd: PM domain to add the device to.
1058 * @dev: Device to be added.
1059 * @td: Set of PM QoS timing parameters to attach to the device.
1061 int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
1062 struct gpd_timing_data *td)
1064 struct generic_pm_domain_data *gpd_data;
1067 dev_dbg(dev, "%s()\n", __func__);
1069 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
1072 gpd_data = genpd_alloc_dev_data(dev, genpd, td);
1073 if (IS_ERR(gpd_data))
1074 return PTR_ERR(gpd_data);
1076 mutex_lock(&genpd->lock);
1078 if (genpd->prepared_count > 0) {
1083 ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
1087 genpd->device_count++;
1088 genpd->max_off_time_changed = true;
1090 list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
1093 mutex_unlock(&genpd->lock);
1096 genpd_free_dev_data(dev, gpd_data);
1098 dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1102 EXPORT_SYMBOL_GPL(__pm_genpd_add_device);
1105 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
1106 * @genpd: PM domain to remove the device from.
1107 * @dev: Device to be removed.
1109 int pm_genpd_remove_device(struct generic_pm_domain *genpd,
1112 struct generic_pm_domain_data *gpd_data;
1113 struct pm_domain_data *pdd;
1116 dev_dbg(dev, "%s()\n", __func__);
1118 if (!genpd || genpd != pm_genpd_lookup_dev(dev))
1121 /* The above validation also means we have existing domain_data. */
1122 pdd = dev->power.subsys_data->domain_data;
1123 gpd_data = to_gpd_data(pdd);
1124 dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
1126 mutex_lock(&genpd->lock);
1128 if (genpd->prepared_count > 0) {
1133 genpd->device_count--;
1134 genpd->max_off_time_changed = true;
1136 if (genpd->detach_dev)
1137 genpd->detach_dev(genpd, dev);
1139 list_del_init(&pdd->list_node);
1141 mutex_unlock(&genpd->lock);
1143 genpd_free_dev_data(dev, gpd_data);
1148 mutex_unlock(&genpd->lock);
1149 dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1153 EXPORT_SYMBOL_GPL(pm_genpd_remove_device);
1156 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
1157 * @genpd: Master PM domain to add the subdomain to.
1158 * @subdomain: Subdomain to be added.
1160 int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
1161 struct generic_pm_domain *subdomain)
1163 struct gpd_link *link, *itr;
1166 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
1167 || genpd == subdomain)
1170 link = kzalloc(sizeof(*link), GFP_KERNEL);
1174 mutex_lock(&subdomain->lock);
1175 mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
1177 if (genpd->status == GPD_STATE_POWER_OFF
1178 && subdomain->status != GPD_STATE_POWER_OFF) {
1183 list_for_each_entry(itr, &genpd->master_links, master_node) {
1184 if (itr->slave == subdomain && itr->master == genpd) {
1190 link->master = genpd;
1191 list_add_tail(&link->master_node, &genpd->master_links);
1192 link->slave = subdomain;
1193 list_add_tail(&link->slave_node, &subdomain->slave_links);
1194 if (subdomain->status != GPD_STATE_POWER_OFF)
1195 genpd_sd_counter_inc(genpd);
1198 mutex_unlock(&genpd->lock);
1199 mutex_unlock(&subdomain->lock);
1204 EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain);
1207 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
1208 * @genpd: Master PM domain to remove the subdomain from.
1209 * @subdomain: Subdomain to be removed.
1211 int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
1212 struct generic_pm_domain *subdomain)
1214 struct gpd_link *link;
1217 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
1220 mutex_lock(&subdomain->lock);
1221 mutex_lock_nested(&genpd->lock, SINGLE_DEPTH_NESTING);
1223 if (!list_empty(&subdomain->master_links) || subdomain->device_count) {
1224 pr_warn("%s: unable to remove subdomain %s\n", genpd->name,
1230 list_for_each_entry(link, &genpd->master_links, master_node) {
1231 if (link->slave != subdomain)
1234 list_del(&link->master_node);
1235 list_del(&link->slave_node);
1237 if (subdomain->status != GPD_STATE_POWER_OFF)
1238 genpd_sd_counter_dec(genpd);
1245 mutex_unlock(&genpd->lock);
1246 mutex_unlock(&subdomain->lock);
1250 EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain);
1253 * pm_genpd_init - Initialize a generic I/O PM domain object.
1254 * @genpd: PM domain object to initialize.
1255 * @gov: PM domain governor to associate with the domain (may be NULL).
1256 * @is_off: Initial value of the domain's power_is_off field.
1258 void pm_genpd_init(struct generic_pm_domain *genpd,
1259 struct dev_power_governor *gov, bool is_off)
1261 if (IS_ERR_OR_NULL(genpd))
1264 INIT_LIST_HEAD(&genpd->master_links);
1265 INIT_LIST_HEAD(&genpd->slave_links);
1266 INIT_LIST_HEAD(&genpd->dev_list);
1267 mutex_init(&genpd->lock);
1269 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
1270 atomic_set(&genpd->sd_count, 0);
1271 genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
1272 genpd->device_count = 0;
1273 genpd->max_off_time_ns = -1;
1274 genpd->max_off_time_changed = true;
1275 genpd->domain.ops.runtime_suspend = genpd_runtime_suspend;
1276 genpd->domain.ops.runtime_resume = genpd_runtime_resume;
1277 genpd->domain.ops.prepare = pm_genpd_prepare;
1278 genpd->domain.ops.suspend = pm_generic_suspend;
1279 genpd->domain.ops.suspend_late = pm_generic_suspend_late;
1280 genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq;
1281 genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq;
1282 genpd->domain.ops.resume_early = pm_generic_resume_early;
1283 genpd->domain.ops.resume = pm_generic_resume;
1284 genpd->domain.ops.freeze = pm_generic_freeze;
1285 genpd->domain.ops.freeze_late = pm_generic_freeze_late;
1286 genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq;
1287 genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq;
1288 genpd->domain.ops.thaw_early = pm_generic_thaw_early;
1289 genpd->domain.ops.thaw = pm_generic_thaw;
1290 genpd->domain.ops.poweroff = pm_generic_poweroff;
1291 genpd->domain.ops.poweroff_late = pm_generic_poweroff_late;
1292 genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq;
1293 genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
1294 genpd->domain.ops.restore_early = pm_generic_restore_early;
1295 genpd->domain.ops.restore = pm_generic_restore;
1296 genpd->domain.ops.complete = pm_genpd_complete;
1298 if (genpd->flags & GENPD_FLAG_PM_CLK) {
1299 genpd->dev_ops.stop = pm_clk_suspend;
1300 genpd->dev_ops.start = pm_clk_resume;
1303 if (genpd->state_idx >= GENPD_MAX_NUM_STATES) {
1304 pr_warn("Initial state index out of bounds.\n");
1305 genpd->state_idx = GENPD_MAX_NUM_STATES - 1;
1308 if (genpd->state_count > GENPD_MAX_NUM_STATES) {
1309 pr_warn("Limiting states to %d\n", GENPD_MAX_NUM_STATES);
1310 genpd->state_count = GENPD_MAX_NUM_STATES;
1313 /* Use only one "off" state if there were no states declared */
1314 if (genpd->state_count == 0)
1315 genpd->state_count = 1;
1317 mutex_lock(&gpd_list_lock);
1318 list_add(&genpd->gpd_list_node, &gpd_list);
1319 mutex_unlock(&gpd_list_lock);
1321 EXPORT_SYMBOL_GPL(pm_genpd_init);
1323 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
1325 * Device Tree based PM domain providers.
1327 * The code below implements generic device tree based PM domain providers that
1328 * bind device tree nodes with generic PM domains registered in the system.
1330 * Any driver that registers generic PM domains and needs to support binding of
1331 * devices to these domains is supposed to register a PM domain provider, which
1332 * maps a PM domain specifier retrieved from the device tree to a PM domain.
1334 * Two simple mapping functions have been provided for convenience:
1335 * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping.
1336 * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by
1341 * struct of_genpd_provider - PM domain provider registration structure
1342 * @link: Entry in global list of PM domain providers
1343 * @node: Pointer to device tree node of PM domain provider
1344 * @xlate: Provider-specific xlate callback mapping a set of specifier cells
1346 * @data: context pointer to be passed into @xlate callback
1348 struct of_genpd_provider {
1349 struct list_head link;
1350 struct device_node *node;
1351 genpd_xlate_t xlate;
1355 /* List of registered PM domain providers. */
1356 static LIST_HEAD(of_genpd_providers);
1357 /* Mutex to protect the list above. */
1358 static DEFINE_MUTEX(of_genpd_mutex);
1361 * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping
1362 * @genpdspec: OF phandle args to map into a PM domain
1363 * @data: xlate function private data - pointer to struct generic_pm_domain
1365 * This is a generic xlate function that can be used to model PM domains that
1366 * have their own device tree nodes. The private data of xlate function needs
1367 * to be a valid pointer to struct generic_pm_domain.
1369 struct generic_pm_domain *__of_genpd_xlate_simple(
1370 struct of_phandle_args *genpdspec,
1373 if (genpdspec->args_count != 0)
1374 return ERR_PTR(-EINVAL);
1377 EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple);
1380 * __of_genpd_xlate_onecell() - Xlate function using a single index.
1381 * @genpdspec: OF phandle args to map into a PM domain
1382 * @data: xlate function private data - pointer to struct genpd_onecell_data
1384 * This is a generic xlate function that can be used to model simple PM domain
1385 * controllers that have one device tree node and provide multiple PM domains.
1386 * A single cell is used as an index into an array of PM domains specified in
1387 * the genpd_onecell_data struct when registering the provider.
1389 struct generic_pm_domain *__of_genpd_xlate_onecell(
1390 struct of_phandle_args *genpdspec,
1393 struct genpd_onecell_data *genpd_data = data;
1394 unsigned int idx = genpdspec->args[0];
1396 if (genpdspec->args_count != 1)
1397 return ERR_PTR(-EINVAL);
1399 if (idx >= genpd_data->num_domains) {
1400 pr_err("%s: invalid domain index %u\n", __func__, idx);
1401 return ERR_PTR(-EINVAL);
1404 if (!genpd_data->domains[idx])
1405 return ERR_PTR(-ENOENT);
1407 return genpd_data->domains[idx];
1409 EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell);
1412 * __of_genpd_add_provider() - Register a PM domain provider for a node
1413 * @np: Device node pointer associated with the PM domain provider.
1414 * @xlate: Callback for decoding PM domain from phandle arguments.
1415 * @data: Context pointer for @xlate callback.
1417 int __of_genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
1420 struct of_genpd_provider *cp;
1422 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
1426 cp->node = of_node_get(np);
1430 mutex_lock(&of_genpd_mutex);
1431 list_add(&cp->link, &of_genpd_providers);
1432 mutex_unlock(&of_genpd_mutex);
1433 pr_debug("Added domain provider from %s\n", np->full_name);
1437 EXPORT_SYMBOL_GPL(__of_genpd_add_provider);
1440 * of_genpd_del_provider() - Remove a previously registered PM domain provider
1441 * @np: Device node pointer associated with the PM domain provider
1443 void of_genpd_del_provider(struct device_node *np)
1445 struct of_genpd_provider *cp;
1447 mutex_lock(&of_genpd_mutex);
1448 list_for_each_entry(cp, &of_genpd_providers, link) {
1449 if (cp->node == np) {
1450 list_del(&cp->link);
1451 of_node_put(cp->node);
1456 mutex_unlock(&of_genpd_mutex);
1458 EXPORT_SYMBOL_GPL(of_genpd_del_provider);
1461 * of_genpd_get_from_provider() - Look-up PM domain
1462 * @genpdspec: OF phandle args to use for look-up
1464 * Looks for a PM domain provider under the node specified by @genpdspec and if
1465 * found, uses xlate function of the provider to map phandle args to a PM
1468 * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
1471 struct generic_pm_domain *of_genpd_get_from_provider(
1472 struct of_phandle_args *genpdspec)
1474 struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
1475 struct of_genpd_provider *provider;
1478 return ERR_PTR(-EINVAL);
1480 mutex_lock(&of_genpd_mutex);
1482 /* Check if we have such a provider in our array */
1483 list_for_each_entry(provider, &of_genpd_providers, link) {
1484 if (provider->node == genpdspec->np)
1485 genpd = provider->xlate(genpdspec, provider->data);
1490 mutex_unlock(&of_genpd_mutex);
1494 EXPORT_SYMBOL_GPL(of_genpd_get_from_provider);
1497 * genpd_dev_pm_detach - Detach a device from its PM domain.
1498 * @dev: Device to detach.
1499 * @power_off: Currently not used
1501 * Try to locate a corresponding generic PM domain, which the device was
1502 * attached to previously. If such is found, the device is detached from it.
1504 static void genpd_dev_pm_detach(struct device *dev, bool power_off)
1506 struct generic_pm_domain *pd;
1510 pd = pm_genpd_lookup_dev(dev);
1514 dev_dbg(dev, "removing from PM domain %s\n", pd->name);
1516 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
1517 ret = pm_genpd_remove_device(pd, dev);
1526 dev_err(dev, "failed to remove from PM domain %s: %d",
1531 /* Check if PM domain can be powered off after removing this device. */
1532 genpd_queue_power_off_work(pd);
1535 static void genpd_dev_pm_sync(struct device *dev)
1537 struct generic_pm_domain *pd;
1539 pd = dev_to_genpd(dev);
1543 genpd_queue_power_off_work(pd);
1547 * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
1548 * @dev: Device to attach.
1550 * Parse device's OF node to find a PM domain specifier. If such is found,
1551 * attaches the device to retrieved pm_domain ops.
1553 * Both generic and legacy Samsung-specific DT bindings are supported to keep
1554 * backwards compatibility with existing DTBs.
1556 * Returns 0 on successfully attached PM domain or negative error code. Note
1557 * that if a power-domain exists for the device, but it cannot be found or
1558 * turned on, then return -EPROBE_DEFER to ensure that the device is not
1559 * probed and to re-try again later.
1561 int genpd_dev_pm_attach(struct device *dev)
1563 struct of_phandle_args pd_args;
1564 struct generic_pm_domain *pd;
1574 ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
1575 "#power-domain-cells", 0, &pd_args);
1581 * Try legacy Samsung-specific bindings
1582 * (for backwards compatibility of DT ABI)
1584 pd_args.args_count = 0;
1585 pd_args.np = of_parse_phandle(dev->of_node,
1586 "samsung,power-domain", 0);
1591 pd = of_genpd_get_from_provider(&pd_args);
1592 of_node_put(pd_args.np);
1594 dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
1595 __func__, PTR_ERR(pd));
1596 return -EPROBE_DEFER;
1599 dev_dbg(dev, "adding to PM domain %s\n", pd->name);
1601 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
1602 ret = pm_genpd_add_device(pd, dev);
1611 dev_err(dev, "failed to add to PM domain %s: %d",
1616 dev->pm_domain->detach = genpd_dev_pm_detach;
1617 dev->pm_domain->sync = genpd_dev_pm_sync;
1619 mutex_lock(&pd->lock);
1620 ret = genpd_poweron(pd, 0);
1621 mutex_unlock(&pd->lock);
1623 return ret ? -EPROBE_DEFER : 0;
1625 EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
1626 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
1629 /*** debugfs support ***/
1631 #ifdef CONFIG_PM_ADVANCED_DEBUG
1632 #include <linux/pm.h>
1633 #include <linux/device.h>
1634 #include <linux/debugfs.h>
1635 #include <linux/seq_file.h>
1636 #include <linux/init.h>
1637 #include <linux/kobject.h>
1638 static struct dentry *pm_genpd_debugfs_dir;
1641 * TODO: This function is a slightly modified version of rtpm_status_show
1642 * from sysfs.c, so generalize it.
1644 static void rtpm_status_str(struct seq_file *s, struct device *dev)
1646 static const char * const status_lookup[] = {
1647 [RPM_ACTIVE] = "active",
1648 [RPM_RESUMING] = "resuming",
1649 [RPM_SUSPENDED] = "suspended",
1650 [RPM_SUSPENDING] = "suspending"
1654 if (dev->power.runtime_error)
1656 else if (dev->power.disable_depth)
1658 else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup))
1659 p = status_lookup[dev->power.runtime_status];
1666 static int pm_genpd_summary_one(struct seq_file *s,
1667 struct generic_pm_domain *genpd)
1669 static const char * const status_lookup[] = {
1670 [GPD_STATE_ACTIVE] = "on",
1671 [GPD_STATE_POWER_OFF] = "off"
1673 struct pm_domain_data *pm_data;
1674 const char *kobj_path;
1675 struct gpd_link *link;
1679 ret = mutex_lock_interruptible(&genpd->lock);
1681 return -ERESTARTSYS;
1683 if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup)))
1685 if (genpd->status == GPD_STATE_POWER_OFF)
1686 snprintf(state, sizeof(state), "%s-%u",
1687 status_lookup[genpd->status], genpd->state_idx);
1689 snprintf(state, sizeof(state), "%s",
1690 status_lookup[genpd->status]);
1691 seq_printf(s, "%-30s %-15s ", genpd->name, state);
1694 * Modifications on the list require holding locks on both
1695 * master and slave, so we are safe.
1696 * Also genpd->name is immutable.
1698 list_for_each_entry(link, &genpd->master_links, master_node) {
1699 seq_printf(s, "%s", link->slave->name);
1700 if (!list_is_last(&link->master_node, &genpd->master_links))
1704 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
1705 kobj_path = kobject_get_path(&pm_data->dev->kobj, GFP_KERNEL);
1706 if (kobj_path == NULL)
1709 seq_printf(s, "\n %-50s ", kobj_path);
1710 rtpm_status_str(s, pm_data->dev);
1716 mutex_unlock(&genpd->lock);
1721 static int pm_genpd_summary_show(struct seq_file *s, void *data)
1723 struct generic_pm_domain *genpd;
1726 seq_puts(s, "domain status slaves\n");
1727 seq_puts(s, " /device runtime status\n");
1728 seq_puts(s, "----------------------------------------------------------------------\n");
1730 ret = mutex_lock_interruptible(&gpd_list_lock);
1732 return -ERESTARTSYS;
1734 list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
1735 ret = pm_genpd_summary_one(s, genpd);
1739 mutex_unlock(&gpd_list_lock);
1744 static int pm_genpd_summary_open(struct inode *inode, struct file *file)
1746 return single_open(file, pm_genpd_summary_show, NULL);
1749 static const struct file_operations pm_genpd_summary_fops = {
1750 .open = pm_genpd_summary_open,
1752 .llseek = seq_lseek,
1753 .release = single_release,
1756 static int __init pm_genpd_debug_init(void)
1760 pm_genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL);
1762 if (!pm_genpd_debugfs_dir)
1765 d = debugfs_create_file("pm_genpd_summary", S_IRUGO,
1766 pm_genpd_debugfs_dir, NULL, &pm_genpd_summary_fops);
1772 late_initcall(pm_genpd_debug_init);
1774 static void __exit pm_genpd_debug_exit(void)
1776 debugfs_remove_recursive(pm_genpd_debugfs_dir);
1778 __exitcall(pm_genpd_debug_exit);
1779 #endif /* CONFIG_PM_ADVANCED_DEBUG */