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_opp.h>
14 #include <linux/pm_runtime.h>
15 #include <linux/pm_domain.h>
16 #include <linux/pm_qos.h>
17 #include <linux/pm_clock.h>
18 #include <linux/slab.h>
19 #include <linux/err.h>
20 #include <linux/sched.h>
21 #include <linux/suspend.h>
22 #include <linux/export.h>
26 #define GENPD_RETRY_MAX_MS 250 /* Approximate */
28 #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \
30 type (*__routine)(struct device *__d); \
31 type __ret = (type)0; \
33 __routine = genpd->dev_ops.callback; \
35 __ret = __routine(dev); \
40 static LIST_HEAD(gpd_list);
41 static DEFINE_MUTEX(gpd_list_lock);
43 struct genpd_lock_ops {
44 void (*lock)(struct generic_pm_domain *genpd);
45 void (*lock_nested)(struct generic_pm_domain *genpd, int depth);
46 int (*lock_interruptible)(struct generic_pm_domain *genpd);
47 void (*unlock)(struct generic_pm_domain *genpd);
50 static void genpd_lock_mtx(struct generic_pm_domain *genpd)
52 mutex_lock(&genpd->mlock);
55 static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd,
58 mutex_lock_nested(&genpd->mlock, depth);
61 static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd)
63 return mutex_lock_interruptible(&genpd->mlock);
66 static void genpd_unlock_mtx(struct generic_pm_domain *genpd)
68 return mutex_unlock(&genpd->mlock);
71 static const struct genpd_lock_ops genpd_mtx_ops = {
72 .lock = genpd_lock_mtx,
73 .lock_nested = genpd_lock_nested_mtx,
74 .lock_interruptible = genpd_lock_interruptible_mtx,
75 .unlock = genpd_unlock_mtx,
78 static void genpd_lock_spin(struct generic_pm_domain *genpd)
79 __acquires(&genpd->slock)
83 spin_lock_irqsave(&genpd->slock, flags);
84 genpd->lock_flags = flags;
87 static void genpd_lock_nested_spin(struct generic_pm_domain *genpd,
89 __acquires(&genpd->slock)
93 spin_lock_irqsave_nested(&genpd->slock, flags, depth);
94 genpd->lock_flags = flags;
97 static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd)
98 __acquires(&genpd->slock)
102 spin_lock_irqsave(&genpd->slock, flags);
103 genpd->lock_flags = flags;
107 static void genpd_unlock_spin(struct generic_pm_domain *genpd)
108 __releases(&genpd->slock)
110 spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags);
113 static const struct genpd_lock_ops genpd_spin_ops = {
114 .lock = genpd_lock_spin,
115 .lock_nested = genpd_lock_nested_spin,
116 .lock_interruptible = genpd_lock_interruptible_spin,
117 .unlock = genpd_unlock_spin,
120 #define genpd_lock(p) p->lock_ops->lock(p)
121 #define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d)
122 #define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p)
123 #define genpd_unlock(p) p->lock_ops->unlock(p)
125 #define genpd_status_on(genpd) (genpd->status == GPD_STATE_ACTIVE)
126 #define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE)
127 #define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON)
128 #define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP)
130 static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev,
131 const struct generic_pm_domain *genpd)
135 ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd);
138 * Warn once if an IRQ safe device is attached to a no sleep domain, as
139 * to indicate a suboptimal configuration for PM. For an always on
140 * domain this isn't case, thus don't warn.
142 if (ret && !genpd_is_always_on(genpd))
143 dev_warn_once(dev, "PM domain %s will not be powered off\n",
150 * Get the generic PM domain for a particular struct device.
151 * This validates the struct device pointer, the PM domain pointer,
152 * and checks that the PM domain pointer is a real generic PM domain.
153 * Any failure results in NULL being returned.
155 static struct generic_pm_domain *genpd_lookup_dev(struct device *dev)
157 struct generic_pm_domain *genpd = NULL, *gpd;
159 if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain))
162 mutex_lock(&gpd_list_lock);
163 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
164 if (&gpd->domain == dev->pm_domain) {
169 mutex_unlock(&gpd_list_lock);
175 * This should only be used where we are certain that the pm_domain
176 * attached to the device is a genpd domain.
178 static struct generic_pm_domain *dev_to_genpd(struct device *dev)
180 if (IS_ERR_OR_NULL(dev->pm_domain))
181 return ERR_PTR(-EINVAL);
183 return pd_to_genpd(dev->pm_domain);
186 static int genpd_stop_dev(const struct generic_pm_domain *genpd,
189 return GENPD_DEV_CALLBACK(genpd, int, stop, dev);
192 static int genpd_start_dev(const struct generic_pm_domain *genpd,
195 return GENPD_DEV_CALLBACK(genpd, int, start, dev);
198 static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
202 if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
203 ret = !!atomic_dec_and_test(&genpd->sd_count);
208 static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
210 atomic_inc(&genpd->sd_count);
211 smp_mb__after_atomic();
214 #ifdef CONFIG_DEBUG_FS
215 static void genpd_update_accounting(struct generic_pm_domain *genpd)
220 delta = ktime_sub(now, genpd->accounting_time);
223 * If genpd->status is active, it means we are just
224 * out of off and so update the idle time and vice
227 if (genpd->status == GPD_STATE_ACTIVE) {
228 int state_idx = genpd->state_idx;
230 genpd->states[state_idx].idle_time =
231 ktime_add(genpd->states[state_idx].idle_time, delta);
233 genpd->on_time = ktime_add(genpd->on_time, delta);
236 genpd->accounting_time = now;
239 static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {}
243 * dev_pm_genpd_set_performance_state- Set performance state of device's power
246 * @dev: Device for which the performance-state needs to be set.
247 * @state: Target performance state of the device. This can be set as 0 when the
248 * device doesn't have any performance state constraints left (And so
249 * the device wouldn't participate anymore to find the target
250 * performance state of the genpd).
252 * It is assumed that the users guarantee that the genpd wouldn't be detached
253 * while this routine is getting called.
255 * Returns 0 on success and negative error values on failures.
257 int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
259 struct generic_pm_domain *genpd;
260 struct generic_pm_domain_data *gpd_data, *pd_data;
261 struct pm_domain_data *pdd;
265 genpd = dev_to_genpd(dev);
269 if (unlikely(!genpd->set_performance_state))
272 if (unlikely(!dev->power.subsys_data ||
273 !dev->power.subsys_data->domain_data)) {
280 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
281 prev = gpd_data->performance_state;
282 gpd_data->performance_state = state;
284 /* New requested state is same as Max requested state */
285 if (state == genpd->performance_state)
288 /* New requested state is higher than Max requested state */
289 if (state > genpd->performance_state)
292 /* Traverse all devices within the domain */
293 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
294 pd_data = to_gpd_data(pdd);
296 if (pd_data->performance_state > state)
297 state = pd_data->performance_state;
300 if (state == genpd->performance_state)
304 * We aren't propagating performance state changes of a subdomain to its
305 * masters as we don't have hardware that needs it. Over that, the
306 * performance states of subdomain and its masters may not have
307 * one-to-one mapping and would require additional information. We can
308 * get back to this once we have hardware that needs it. For that
309 * reason, we don't have to consider performance state of the subdomains
314 if (genpd_status_on(genpd)) {
315 ret = genpd->set_performance_state(genpd, state);
317 gpd_data->performance_state = prev;
322 genpd->performance_state = state;
329 EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state);
331 static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
333 unsigned int state_idx = genpd->state_idx;
338 if (!genpd->power_on)
342 return genpd->power_on(genpd);
344 time_start = ktime_get();
345 ret = genpd->power_on(genpd);
349 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
351 if (unlikely(genpd->set_performance_state)) {
352 ret = genpd->set_performance_state(genpd, genpd->performance_state);
354 pr_warn("%s: Failed to set performance state %d (%d)\n",
355 genpd->name, genpd->performance_state, ret);
359 if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns)
362 genpd->states[state_idx].power_on_latency_ns = elapsed_ns;
363 genpd->max_off_time_changed = true;
364 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
365 genpd->name, "on", elapsed_ns);
370 static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed)
372 unsigned int state_idx = genpd->state_idx;
377 if (!genpd->power_off)
381 return genpd->power_off(genpd);
383 time_start = ktime_get();
384 ret = genpd->power_off(genpd);
388 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
389 if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns)
392 genpd->states[state_idx].power_off_latency_ns = elapsed_ns;
393 genpd->max_off_time_changed = true;
394 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
395 genpd->name, "off", elapsed_ns);
401 * genpd_queue_power_off_work - Queue up the execution of genpd_power_off().
402 * @genpd: PM domain to power off.
404 * Queue up the execution of genpd_power_off() unless it's already been done
407 static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
409 queue_work(pm_wq, &genpd->power_off_work);
413 * genpd_power_off - Remove power from a given PM domain.
414 * @genpd: PM domain to power down.
415 * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the
416 * RPM status of the releated device is in an intermediate state, not yet turned
417 * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not
418 * be RPM_SUSPENDED, while it tries to power off the PM domain.
420 * If all of the @genpd's devices have been suspended and all of its subdomains
421 * have been powered down, remove power from @genpd.
423 static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
426 struct pm_domain_data *pdd;
427 struct gpd_link *link;
428 unsigned int not_suspended = 0;
431 * Do not try to power off the domain in the following situations:
432 * (1) The domain is already in the "power off" state.
433 * (2) System suspend is in progress.
435 if (!genpd_status_on(genpd) || genpd->prepared_count > 0)
439 * Abort power off for the PM domain in the following situations:
440 * (1) The domain is configured as always on.
441 * (2) When the domain has a subdomain being powered on.
443 if (genpd_is_always_on(genpd) || atomic_read(&genpd->sd_count) > 0)
446 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
447 enum pm_qos_flags_status stat;
449 stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF);
450 if (stat > PM_QOS_FLAGS_NONE)
454 * Do not allow PM domain to be powered off, when an IRQ safe
455 * device is part of a non-IRQ safe domain.
457 if (!pm_runtime_suspended(pdd->dev) ||
458 irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd))
462 if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on))
465 if (genpd->gov && genpd->gov->power_down_ok) {
466 if (!genpd->gov->power_down_ok(&genpd->domain))
470 /* Default to shallowest state. */
472 genpd->state_idx = 0;
474 if (genpd->power_off) {
477 if (atomic_read(&genpd->sd_count) > 0)
481 * If sd_count > 0 at this point, one of the subdomains hasn't
482 * managed to call genpd_power_on() for the master yet after
483 * incrementing it. In that case genpd_power_on() will wait
484 * for us to drop the lock, so we can call .power_off() and let
485 * the genpd_power_on() restore power for us (this shouldn't
486 * happen very often).
488 ret = _genpd_power_off(genpd, true);
493 genpd->status = GPD_STATE_POWER_OFF;
494 genpd_update_accounting(genpd);
496 list_for_each_entry(link, &genpd->slave_links, slave_node) {
497 genpd_sd_counter_dec(link->master);
498 genpd_lock_nested(link->master, depth + 1);
499 genpd_power_off(link->master, false, depth + 1);
500 genpd_unlock(link->master);
507 * genpd_power_on - Restore power to a given PM domain and its masters.
508 * @genpd: PM domain to power up.
509 * @depth: nesting count for lockdep.
511 * Restore power to @genpd and all of its masters so that it is possible to
512 * resume a device belonging to it.
514 static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth)
516 struct gpd_link *link;
519 if (genpd_status_on(genpd))
523 * The list is guaranteed not to change while the loop below is being
524 * executed, unless one of the masters' .power_on() callbacks fiddles
527 list_for_each_entry(link, &genpd->slave_links, slave_node) {
528 struct generic_pm_domain *master = link->master;
530 genpd_sd_counter_inc(master);
532 genpd_lock_nested(master, depth + 1);
533 ret = genpd_power_on(master, depth + 1);
534 genpd_unlock(master);
537 genpd_sd_counter_dec(master);
542 ret = _genpd_power_on(genpd, true);
546 genpd->status = GPD_STATE_ACTIVE;
547 genpd_update_accounting(genpd);
552 list_for_each_entry_continue_reverse(link,
555 genpd_sd_counter_dec(link->master);
556 genpd_lock_nested(link->master, depth + 1);
557 genpd_power_off(link->master, false, depth + 1);
558 genpd_unlock(link->master);
564 static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
565 unsigned long val, void *ptr)
567 struct generic_pm_domain_data *gpd_data;
570 gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
571 dev = gpd_data->base.dev;
574 struct generic_pm_domain *genpd;
575 struct pm_domain_data *pdd;
577 spin_lock_irq(&dev->power.lock);
579 pdd = dev->power.subsys_data ?
580 dev->power.subsys_data->domain_data : NULL;
582 to_gpd_data(pdd)->td.constraint_changed = true;
583 genpd = dev_to_genpd(dev);
585 genpd = ERR_PTR(-ENODATA);
588 spin_unlock_irq(&dev->power.lock);
590 if (!IS_ERR(genpd)) {
592 genpd->max_off_time_changed = true;
597 if (!dev || dev->power.ignore_children)
605 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
606 * @work: Work structure used for scheduling the execution of this function.
608 static void genpd_power_off_work_fn(struct work_struct *work)
610 struct generic_pm_domain *genpd;
612 genpd = container_of(work, struct generic_pm_domain, power_off_work);
615 genpd_power_off(genpd, false, 0);
620 * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks
621 * @dev: Device to handle.
623 static int __genpd_runtime_suspend(struct device *dev)
625 int (*cb)(struct device *__dev);
627 if (dev->type && dev->type->pm)
628 cb = dev->type->pm->runtime_suspend;
629 else if (dev->class && dev->class->pm)
630 cb = dev->class->pm->runtime_suspend;
631 else if (dev->bus && dev->bus->pm)
632 cb = dev->bus->pm->runtime_suspend;
636 if (!cb && dev->driver && dev->driver->pm)
637 cb = dev->driver->pm->runtime_suspend;
639 return cb ? cb(dev) : 0;
643 * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks
644 * @dev: Device to handle.
646 static int __genpd_runtime_resume(struct device *dev)
648 int (*cb)(struct device *__dev);
650 if (dev->type && dev->type->pm)
651 cb = dev->type->pm->runtime_resume;
652 else if (dev->class && dev->class->pm)
653 cb = dev->class->pm->runtime_resume;
654 else if (dev->bus && dev->bus->pm)
655 cb = dev->bus->pm->runtime_resume;
659 if (!cb && dev->driver && dev->driver->pm)
660 cb = dev->driver->pm->runtime_resume;
662 return cb ? cb(dev) : 0;
666 * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
667 * @dev: Device to suspend.
669 * Carry out a runtime suspend of a device under the assumption that its
670 * pm_domain field points to the domain member of an object of type
671 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
673 static int genpd_runtime_suspend(struct device *dev)
675 struct generic_pm_domain *genpd;
676 bool (*suspend_ok)(struct device *__dev);
677 struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
678 bool runtime_pm = pm_runtime_enabled(dev);
683 dev_dbg(dev, "%s()\n", __func__);
685 genpd = dev_to_genpd(dev);
690 * A runtime PM centric subsystem/driver may re-use the runtime PM
691 * callbacks for other purposes than runtime PM. In those scenarios
692 * runtime PM is disabled. Under these circumstances, we shall skip
693 * validating/measuring the PM QoS latency.
695 suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL;
696 if (runtime_pm && suspend_ok && !suspend_ok(dev))
699 /* Measure suspend latency. */
702 time_start = ktime_get();
704 ret = __genpd_runtime_suspend(dev);
708 ret = genpd_stop_dev(genpd, dev);
710 __genpd_runtime_resume(dev);
714 /* Update suspend latency value if the measured time exceeds it. */
716 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
717 if (elapsed_ns > td->suspend_latency_ns) {
718 td->suspend_latency_ns = elapsed_ns;
719 dev_dbg(dev, "suspend latency exceeded, %lld ns\n",
721 genpd->max_off_time_changed = true;
722 td->constraint_changed = true;
727 * If power.irq_safe is set, this routine may be run with
728 * IRQs disabled, so suspend only if the PM domain also is irq_safe.
730 if (irq_safe_dev_in_no_sleep_domain(dev, genpd))
734 genpd_power_off(genpd, true, 0);
741 * genpd_runtime_resume - Resume a device belonging to I/O PM domain.
742 * @dev: Device to resume.
744 * Carry out a runtime resume of a device under the assumption that its
745 * pm_domain field points to the domain member of an object of type
746 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
748 static int genpd_runtime_resume(struct device *dev)
750 struct generic_pm_domain *genpd;
751 struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
752 bool runtime_pm = pm_runtime_enabled(dev);
758 dev_dbg(dev, "%s()\n", __func__);
760 genpd = dev_to_genpd(dev);
765 * As we don't power off a non IRQ safe domain, which holds
766 * an IRQ safe device, we don't need to restore power to it.
768 if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) {
774 ret = genpd_power_on(genpd, 0);
781 /* Measure resume latency. */
783 if (timed && runtime_pm)
784 time_start = ktime_get();
786 ret = genpd_start_dev(genpd, dev);
790 ret = __genpd_runtime_resume(dev);
794 /* Update resume latency value if the measured time exceeds it. */
795 if (timed && runtime_pm) {
796 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
797 if (elapsed_ns > td->resume_latency_ns) {
798 td->resume_latency_ns = elapsed_ns;
799 dev_dbg(dev, "resume latency exceeded, %lld ns\n",
801 genpd->max_off_time_changed = true;
802 td->constraint_changed = true;
809 genpd_stop_dev(genpd, dev);
811 if (!pm_runtime_is_irq_safe(dev) ||
812 (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) {
814 genpd_power_off(genpd, true, 0);
821 static bool pd_ignore_unused;
822 static int __init pd_ignore_unused_setup(char *__unused)
824 pd_ignore_unused = true;
827 __setup("pd_ignore_unused", pd_ignore_unused_setup);
830 * genpd_power_off_unused - Power off all PM domains with no devices in use.
832 static int __init genpd_power_off_unused(void)
834 struct generic_pm_domain *genpd;
836 if (pd_ignore_unused) {
837 pr_warn("genpd: Not disabling unused power domains\n");
841 mutex_lock(&gpd_list_lock);
843 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
844 genpd_queue_power_off_work(genpd);
846 mutex_unlock(&gpd_list_lock);
850 late_initcall(genpd_power_off_unused);
852 #if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF)
854 static bool genpd_present(const struct generic_pm_domain *genpd)
856 const struct generic_pm_domain *gpd;
858 if (IS_ERR_OR_NULL(genpd))
861 list_for_each_entry(gpd, &gpd_list, gpd_list_node)
870 #ifdef CONFIG_PM_SLEEP
873 * genpd_sync_power_off - Synchronously power off a PM domain and its masters.
874 * @genpd: PM domain to power off, if possible.
875 * @use_lock: use the lock.
876 * @depth: nesting count for lockdep.
878 * Check if the given PM domain can be powered off (during system suspend or
879 * hibernation) and do that if so. Also, in that case propagate to its masters.
881 * This function is only called in "noirq" and "syscore" stages of system power
882 * transitions. The "noirq" callbacks may be executed asynchronously, thus in
883 * these cases the lock must be held.
885 static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock,
888 struct gpd_link *link;
890 if (!genpd_status_on(genpd) || genpd_is_always_on(genpd))
893 if (genpd->suspended_count != genpd->device_count
894 || atomic_read(&genpd->sd_count) > 0)
897 /* Choose the deepest state when suspending */
898 genpd->state_idx = genpd->state_count - 1;
899 if (_genpd_power_off(genpd, false))
902 genpd->status = GPD_STATE_POWER_OFF;
904 list_for_each_entry(link, &genpd->slave_links, slave_node) {
905 genpd_sd_counter_dec(link->master);
908 genpd_lock_nested(link->master, depth + 1);
910 genpd_sync_power_off(link->master, use_lock, depth + 1);
913 genpd_unlock(link->master);
918 * genpd_sync_power_on - Synchronously power on a PM domain and its masters.
919 * @genpd: PM domain to power on.
920 * @use_lock: use the lock.
921 * @depth: nesting count for lockdep.
923 * This function is only called in "noirq" and "syscore" stages of system power
924 * transitions. The "noirq" callbacks may be executed asynchronously, thus in
925 * these cases the lock must be held.
927 static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock,
930 struct gpd_link *link;
932 if (genpd_status_on(genpd))
935 list_for_each_entry(link, &genpd->slave_links, slave_node) {
936 genpd_sd_counter_inc(link->master);
939 genpd_lock_nested(link->master, depth + 1);
941 genpd_sync_power_on(link->master, use_lock, depth + 1);
944 genpd_unlock(link->master);
947 _genpd_power_on(genpd, false);
949 genpd->status = GPD_STATE_ACTIVE;
953 * resume_needed - Check whether to resume a device before system suspend.
954 * @dev: Device to check.
955 * @genpd: PM domain the device belongs to.
957 * There are two cases in which a device that can wake up the system from sleep
958 * states should be resumed by genpd_prepare(): (1) if the device is enabled
959 * to wake up the system and it has to remain active for this purpose while the
960 * system is in the sleep state and (2) if the device is not enabled to wake up
961 * the system from sleep states and it generally doesn't generate wakeup signals
962 * by itself (those signals are generated on its behalf by other parts of the
963 * system). In the latter case it may be necessary to reconfigure the device's
964 * wakeup settings during system suspend, because it may have been set up to
965 * signal remote wakeup from the system's working state as needed by runtime PM.
966 * Return 'true' in either of the above cases.
968 static bool resume_needed(struct device *dev,
969 const struct generic_pm_domain *genpd)
973 if (!device_can_wakeup(dev))
976 active_wakeup = genpd_is_active_wakeup(genpd);
977 return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
981 * genpd_prepare - Start power transition of a device in a PM domain.
982 * @dev: Device to start the transition of.
984 * Start a power transition of a device (during a system-wide power transition)
985 * under the assumption that its pm_domain field points to the domain member of
986 * an object of type struct generic_pm_domain representing a PM domain
987 * consisting of I/O devices.
989 static int genpd_prepare(struct device *dev)
991 struct generic_pm_domain *genpd;
994 dev_dbg(dev, "%s()\n", __func__);
996 genpd = dev_to_genpd(dev);
1001 * If a wakeup request is pending for the device, it should be woken up
1002 * at this point and a system wakeup event should be reported if it's
1003 * set up to wake up the system from sleep states.
1005 if (resume_needed(dev, genpd))
1006 pm_runtime_resume(dev);
1010 if (genpd->prepared_count++ == 0)
1011 genpd->suspended_count = 0;
1013 genpd_unlock(genpd);
1015 ret = pm_generic_prepare(dev);
1019 genpd->prepared_count--;
1021 genpd_unlock(genpd);
1024 /* Never return 1, as genpd don't cope with the direct_complete path. */
1025 return ret >= 0 ? 0 : ret;
1029 * genpd_finish_suspend - Completion of suspend or hibernation of device in an
1031 * @dev: Device to suspend.
1032 * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback.
1034 * Stop the device and remove power from the domain if all devices in it have
1037 static int genpd_finish_suspend(struct device *dev, bool poweroff)
1039 struct generic_pm_domain *genpd;
1042 genpd = dev_to_genpd(dev);
1047 ret = pm_generic_poweroff_noirq(dev);
1049 ret = pm_generic_suspend_noirq(dev);
1053 if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd))
1056 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1057 !pm_runtime_status_suspended(dev)) {
1058 ret = genpd_stop_dev(genpd, dev);
1061 pm_generic_restore_noirq(dev);
1063 pm_generic_resume_noirq(dev);
1069 genpd->suspended_count++;
1070 genpd_sync_power_off(genpd, true, 0);
1071 genpd_unlock(genpd);
1077 * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
1078 * @dev: Device to suspend.
1080 * Stop the device and remove power from the domain if all devices in it have
1083 static int genpd_suspend_noirq(struct device *dev)
1085 dev_dbg(dev, "%s()\n", __func__);
1087 return genpd_finish_suspend(dev, false);
1091 * genpd_resume_noirq - Start of resume of device in an I/O PM domain.
1092 * @dev: Device to resume.
1094 * Restore power to the device's PM domain, if necessary, and start the device.
1096 static int genpd_resume_noirq(struct device *dev)
1098 struct generic_pm_domain *genpd;
1101 dev_dbg(dev, "%s()\n", __func__);
1103 genpd = dev_to_genpd(dev);
1107 if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd))
1108 return pm_generic_resume_noirq(dev);
1111 genpd_sync_power_on(genpd, true, 0);
1112 genpd->suspended_count--;
1113 genpd_unlock(genpd);
1115 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1116 !pm_runtime_status_suspended(dev)) {
1117 ret = genpd_start_dev(genpd, dev);
1122 return pm_generic_resume_noirq(dev);
1126 * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
1127 * @dev: Device to freeze.
1129 * Carry out a late freeze of a device under the assumption that its
1130 * pm_domain field points to the domain member of an object of type
1131 * struct generic_pm_domain representing a power domain consisting of I/O
1134 static int genpd_freeze_noirq(struct device *dev)
1136 const struct generic_pm_domain *genpd;
1139 dev_dbg(dev, "%s()\n", __func__);
1141 genpd = dev_to_genpd(dev);
1145 ret = pm_generic_freeze_noirq(dev);
1149 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1150 !pm_runtime_status_suspended(dev))
1151 ret = genpd_stop_dev(genpd, dev);
1157 * genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
1158 * @dev: Device to thaw.
1160 * Start the device, unless power has been removed from the domain already
1161 * before the system transition.
1163 static int genpd_thaw_noirq(struct device *dev)
1165 const struct generic_pm_domain *genpd;
1168 dev_dbg(dev, "%s()\n", __func__);
1170 genpd = dev_to_genpd(dev);
1174 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1175 !pm_runtime_status_suspended(dev)) {
1176 ret = genpd_start_dev(genpd, dev);
1181 return pm_generic_thaw_noirq(dev);
1185 * genpd_poweroff_noirq - Completion of hibernation of device in an
1187 * @dev: Device to poweroff.
1189 * Stop the device and remove power from the domain if all devices in it have
1192 static int genpd_poweroff_noirq(struct device *dev)
1194 dev_dbg(dev, "%s()\n", __func__);
1196 return genpd_finish_suspend(dev, true);
1200 * genpd_restore_noirq - Start of restore of device in an I/O PM domain.
1201 * @dev: Device to resume.
1203 * Make sure the domain will be in the same power state as before the
1204 * hibernation the system is resuming from and start the device if necessary.
1206 static int genpd_restore_noirq(struct device *dev)
1208 struct generic_pm_domain *genpd;
1211 dev_dbg(dev, "%s()\n", __func__);
1213 genpd = dev_to_genpd(dev);
1218 * At this point suspended_count == 0 means we are being run for the
1219 * first time for the given domain in the present cycle.
1222 if (genpd->suspended_count++ == 0)
1224 * The boot kernel might put the domain into arbitrary state,
1225 * so make it appear as powered off to genpd_sync_power_on(),
1226 * so that it tries to power it on in case it was really off.
1228 genpd->status = GPD_STATE_POWER_OFF;
1230 genpd_sync_power_on(genpd, true, 0);
1231 genpd_unlock(genpd);
1233 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1234 !pm_runtime_status_suspended(dev)) {
1235 ret = genpd_start_dev(genpd, dev);
1240 return pm_generic_restore_noirq(dev);
1244 * genpd_complete - Complete power transition of a device in a power domain.
1245 * @dev: Device to complete the transition of.
1247 * Complete a power transition of a device (during a system-wide power
1248 * transition) under the assumption that its pm_domain field points to the
1249 * domain member of an object of type struct generic_pm_domain representing
1250 * a power domain consisting of I/O devices.
1252 static void genpd_complete(struct device *dev)
1254 struct generic_pm_domain *genpd;
1256 dev_dbg(dev, "%s()\n", __func__);
1258 genpd = dev_to_genpd(dev);
1262 pm_generic_complete(dev);
1266 genpd->prepared_count--;
1267 if (!genpd->prepared_count)
1268 genpd_queue_power_off_work(genpd);
1270 genpd_unlock(genpd);
1274 * genpd_syscore_switch - Switch power during system core suspend or resume.
1275 * @dev: Device that normally is marked as "always on" to switch power for.
1277 * This routine may only be called during the system core (syscore) suspend or
1278 * resume phase for devices whose "always on" flags are set.
1280 static void genpd_syscore_switch(struct device *dev, bool suspend)
1282 struct generic_pm_domain *genpd;
1284 genpd = dev_to_genpd(dev);
1285 if (!genpd_present(genpd))
1289 genpd->suspended_count++;
1290 genpd_sync_power_off(genpd, false, 0);
1292 genpd_sync_power_on(genpd, false, 0);
1293 genpd->suspended_count--;
1297 void pm_genpd_syscore_poweroff(struct device *dev)
1299 genpd_syscore_switch(dev, true);
1301 EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff);
1303 void pm_genpd_syscore_poweron(struct device *dev)
1305 genpd_syscore_switch(dev, false);
1307 EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron);
1309 #else /* !CONFIG_PM_SLEEP */
1311 #define genpd_prepare NULL
1312 #define genpd_suspend_noirq NULL
1313 #define genpd_resume_noirq NULL
1314 #define genpd_freeze_noirq NULL
1315 #define genpd_thaw_noirq NULL
1316 #define genpd_poweroff_noirq NULL
1317 #define genpd_restore_noirq NULL
1318 #define genpd_complete NULL
1320 #endif /* CONFIG_PM_SLEEP */
1322 static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev,
1323 struct gpd_timing_data *td)
1325 struct generic_pm_domain_data *gpd_data;
1328 ret = dev_pm_get_subsys_data(dev);
1330 return ERR_PTR(ret);
1332 gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
1341 gpd_data->base.dev = dev;
1342 gpd_data->td.constraint_changed = true;
1343 gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS;
1344 gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
1346 spin_lock_irq(&dev->power.lock);
1348 if (dev->power.subsys_data->domain_data) {
1353 dev->power.subsys_data->domain_data = &gpd_data->base;
1355 spin_unlock_irq(&dev->power.lock);
1360 spin_unlock_irq(&dev->power.lock);
1363 dev_pm_put_subsys_data(dev);
1364 return ERR_PTR(ret);
1367 static void genpd_free_dev_data(struct device *dev,
1368 struct generic_pm_domain_data *gpd_data)
1370 spin_lock_irq(&dev->power.lock);
1372 dev->power.subsys_data->domain_data = NULL;
1374 spin_unlock_irq(&dev->power.lock);
1377 dev_pm_put_subsys_data(dev);
1380 static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
1381 struct gpd_timing_data *td)
1383 struct generic_pm_domain_data *gpd_data;
1386 dev_dbg(dev, "%s()\n", __func__);
1388 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
1391 gpd_data = genpd_alloc_dev_data(dev, td);
1392 if (IS_ERR(gpd_data))
1393 return PTR_ERR(gpd_data);
1397 ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
1401 dev_pm_domain_set(dev, &genpd->domain);
1403 genpd->device_count++;
1404 genpd->max_off_time_changed = true;
1406 list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
1409 genpd_unlock(genpd);
1412 genpd_free_dev_data(dev, gpd_data);
1414 dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1420 * pm_genpd_add_device - Add a device to an I/O PM domain.
1421 * @genpd: PM domain to add the device to.
1422 * @dev: Device to be added.
1424 int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
1428 mutex_lock(&gpd_list_lock);
1429 ret = genpd_add_device(genpd, dev, NULL);
1430 mutex_unlock(&gpd_list_lock);
1434 EXPORT_SYMBOL_GPL(pm_genpd_add_device);
1436 static int genpd_remove_device(struct generic_pm_domain *genpd,
1439 struct generic_pm_domain_data *gpd_data;
1440 struct pm_domain_data *pdd;
1443 dev_dbg(dev, "%s()\n", __func__);
1445 pdd = dev->power.subsys_data->domain_data;
1446 gpd_data = to_gpd_data(pdd);
1447 dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
1451 if (genpd->prepared_count > 0) {
1456 genpd->device_count--;
1457 genpd->max_off_time_changed = true;
1459 if (genpd->detach_dev)
1460 genpd->detach_dev(genpd, dev);
1462 dev_pm_domain_set(dev, NULL);
1464 list_del_init(&pdd->list_node);
1466 genpd_unlock(genpd);
1468 genpd_free_dev_data(dev, gpd_data);
1473 genpd_unlock(genpd);
1474 dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1480 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
1481 * @dev: Device to be removed.
1483 int pm_genpd_remove_device(struct device *dev)
1485 struct generic_pm_domain *genpd = genpd_lookup_dev(dev);
1490 return genpd_remove_device(genpd, dev);
1492 EXPORT_SYMBOL_GPL(pm_genpd_remove_device);
1494 static int genpd_add_subdomain(struct generic_pm_domain *genpd,
1495 struct generic_pm_domain *subdomain)
1497 struct gpd_link *link, *itr;
1500 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
1501 || genpd == subdomain)
1505 * If the domain can be powered on/off in an IRQ safe
1506 * context, ensure that the subdomain can also be
1507 * powered on/off in that context.
1509 if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) {
1510 WARN(1, "Parent %s of subdomain %s must be IRQ safe\n",
1511 genpd->name, subdomain->name);
1515 link = kzalloc(sizeof(*link), GFP_KERNEL);
1519 genpd_lock(subdomain);
1520 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
1522 if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) {
1527 list_for_each_entry(itr, &genpd->master_links, master_node) {
1528 if (itr->slave == subdomain && itr->master == genpd) {
1534 link->master = genpd;
1535 list_add_tail(&link->master_node, &genpd->master_links);
1536 link->slave = subdomain;
1537 list_add_tail(&link->slave_node, &subdomain->slave_links);
1538 if (genpd_status_on(subdomain))
1539 genpd_sd_counter_inc(genpd);
1542 genpd_unlock(genpd);
1543 genpd_unlock(subdomain);
1550 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
1551 * @genpd: Master PM domain to add the subdomain to.
1552 * @subdomain: Subdomain to be added.
1554 int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
1555 struct generic_pm_domain *subdomain)
1559 mutex_lock(&gpd_list_lock);
1560 ret = genpd_add_subdomain(genpd, subdomain);
1561 mutex_unlock(&gpd_list_lock);
1565 EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain);
1568 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
1569 * @genpd: Master PM domain to remove the subdomain from.
1570 * @subdomain: Subdomain to be removed.
1572 int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
1573 struct generic_pm_domain *subdomain)
1575 struct gpd_link *l, *link;
1578 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
1581 genpd_lock(subdomain);
1582 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
1584 if (!list_empty(&subdomain->master_links) || subdomain->device_count) {
1585 pr_warn("%s: unable to remove subdomain %s\n", genpd->name,
1591 list_for_each_entry_safe(link, l, &genpd->master_links, master_node) {
1592 if (link->slave != subdomain)
1595 list_del(&link->master_node);
1596 list_del(&link->slave_node);
1598 if (genpd_status_on(subdomain))
1599 genpd_sd_counter_dec(genpd);
1606 genpd_unlock(genpd);
1607 genpd_unlock(subdomain);
1611 EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain);
1613 static int genpd_set_default_power_state(struct generic_pm_domain *genpd)
1615 struct genpd_power_state *state;
1617 state = kzalloc(sizeof(*state), GFP_KERNEL);
1621 genpd->states = state;
1622 genpd->state_count = 1;
1623 genpd->free = state;
1628 static void genpd_lock_init(struct generic_pm_domain *genpd)
1630 if (genpd->flags & GENPD_FLAG_IRQ_SAFE) {
1631 spin_lock_init(&genpd->slock);
1632 genpd->lock_ops = &genpd_spin_ops;
1634 mutex_init(&genpd->mlock);
1635 genpd->lock_ops = &genpd_mtx_ops;
1640 * pm_genpd_init - Initialize a generic I/O PM domain object.
1641 * @genpd: PM domain object to initialize.
1642 * @gov: PM domain governor to associate with the domain (may be NULL).
1643 * @is_off: Initial value of the domain's power_is_off field.
1645 * Returns 0 on successful initialization, else a negative error code.
1647 int pm_genpd_init(struct generic_pm_domain *genpd,
1648 struct dev_power_governor *gov, bool is_off)
1652 if (IS_ERR_OR_NULL(genpd))
1655 INIT_LIST_HEAD(&genpd->master_links);
1656 INIT_LIST_HEAD(&genpd->slave_links);
1657 INIT_LIST_HEAD(&genpd->dev_list);
1658 genpd_lock_init(genpd);
1660 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
1661 atomic_set(&genpd->sd_count, 0);
1662 genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
1663 genpd->device_count = 0;
1664 genpd->max_off_time_ns = -1;
1665 genpd->max_off_time_changed = true;
1666 genpd->provider = NULL;
1667 genpd->has_provider = false;
1668 genpd->accounting_time = ktime_get();
1669 genpd->domain.ops.runtime_suspend = genpd_runtime_suspend;
1670 genpd->domain.ops.runtime_resume = genpd_runtime_resume;
1671 genpd->domain.ops.prepare = genpd_prepare;
1672 genpd->domain.ops.suspend_noirq = genpd_suspend_noirq;
1673 genpd->domain.ops.resume_noirq = genpd_resume_noirq;
1674 genpd->domain.ops.freeze_noirq = genpd_freeze_noirq;
1675 genpd->domain.ops.thaw_noirq = genpd_thaw_noirq;
1676 genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq;
1677 genpd->domain.ops.restore_noirq = genpd_restore_noirq;
1678 genpd->domain.ops.complete = genpd_complete;
1680 if (genpd->flags & GENPD_FLAG_PM_CLK) {
1681 genpd->dev_ops.stop = pm_clk_suspend;
1682 genpd->dev_ops.start = pm_clk_resume;
1685 /* Always-on domains must be powered on at initialization. */
1686 if (genpd_is_always_on(genpd) && !genpd_status_on(genpd))
1689 /* Use only one "off" state if there were no states declared */
1690 if (genpd->state_count == 0) {
1691 ret = genpd_set_default_power_state(genpd);
1695 pr_warn("%s : no governor for states\n", genpd->name);
1698 device_initialize(&genpd->dev);
1699 dev_set_name(&genpd->dev, "%s", genpd->name);
1701 mutex_lock(&gpd_list_lock);
1702 list_add(&genpd->gpd_list_node, &gpd_list);
1703 mutex_unlock(&gpd_list_lock);
1707 EXPORT_SYMBOL_GPL(pm_genpd_init);
1709 static int genpd_remove(struct generic_pm_domain *genpd)
1711 struct gpd_link *l, *link;
1713 if (IS_ERR_OR_NULL(genpd))
1718 if (genpd->has_provider) {
1719 genpd_unlock(genpd);
1720 pr_err("Provider present, unable to remove %s\n", genpd->name);
1724 if (!list_empty(&genpd->master_links) || genpd->device_count) {
1725 genpd_unlock(genpd);
1726 pr_err("%s: unable to remove %s\n", __func__, genpd->name);
1730 list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) {
1731 list_del(&link->master_node);
1732 list_del(&link->slave_node);
1736 list_del(&genpd->gpd_list_node);
1737 genpd_unlock(genpd);
1738 cancel_work_sync(&genpd->power_off_work);
1740 pr_debug("%s: removed %s\n", __func__, genpd->name);
1746 * pm_genpd_remove - Remove a generic I/O PM domain
1747 * @genpd: Pointer to PM domain that is to be removed.
1749 * To remove the PM domain, this function:
1750 * - Removes the PM domain as a subdomain to any parent domains,
1752 * - Removes the PM domain from the list of registered PM domains.
1754 * The PM domain will only be removed, if the associated provider has
1755 * been removed, it is not a parent to any other PM domain and has no
1756 * devices associated with it.
1758 int pm_genpd_remove(struct generic_pm_domain *genpd)
1762 mutex_lock(&gpd_list_lock);
1763 ret = genpd_remove(genpd);
1764 mutex_unlock(&gpd_list_lock);
1768 EXPORT_SYMBOL_GPL(pm_genpd_remove);
1770 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
1773 * Device Tree based PM domain providers.
1775 * The code below implements generic device tree based PM domain providers that
1776 * bind device tree nodes with generic PM domains registered in the system.
1778 * Any driver that registers generic PM domains and needs to support binding of
1779 * devices to these domains is supposed to register a PM domain provider, which
1780 * maps a PM domain specifier retrieved from the device tree to a PM domain.
1782 * Two simple mapping functions have been provided for convenience:
1783 * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping.
1784 * - genpd_xlate_onecell() for mapping of multiple PM domains per node by
1789 * struct of_genpd_provider - PM domain provider registration structure
1790 * @link: Entry in global list of PM domain providers
1791 * @node: Pointer to device tree node of PM domain provider
1792 * @xlate: Provider-specific xlate callback mapping a set of specifier cells
1794 * @data: context pointer to be passed into @xlate callback
1796 struct of_genpd_provider {
1797 struct list_head link;
1798 struct device_node *node;
1799 genpd_xlate_t xlate;
1803 /* List of registered PM domain providers. */
1804 static LIST_HEAD(of_genpd_providers);
1805 /* Mutex to protect the list above. */
1806 static DEFINE_MUTEX(of_genpd_mutex);
1809 * genpd_xlate_simple() - Xlate function for direct node-domain mapping
1810 * @genpdspec: OF phandle args to map into a PM domain
1811 * @data: xlate function private data - pointer to struct generic_pm_domain
1813 * This is a generic xlate function that can be used to model PM domains that
1814 * have their own device tree nodes. The private data of xlate function needs
1815 * to be a valid pointer to struct generic_pm_domain.
1817 static struct generic_pm_domain *genpd_xlate_simple(
1818 struct of_phandle_args *genpdspec,
1825 * genpd_xlate_onecell() - Xlate function using a single index.
1826 * @genpdspec: OF phandle args to map into a PM domain
1827 * @data: xlate function private data - pointer to struct genpd_onecell_data
1829 * This is a generic xlate function that can be used to model simple PM domain
1830 * controllers that have one device tree node and provide multiple PM domains.
1831 * A single cell is used as an index into an array of PM domains specified in
1832 * the genpd_onecell_data struct when registering the provider.
1834 static struct generic_pm_domain *genpd_xlate_onecell(
1835 struct of_phandle_args *genpdspec,
1838 struct genpd_onecell_data *genpd_data = data;
1839 unsigned int idx = genpdspec->args[0];
1841 if (genpdspec->args_count != 1)
1842 return ERR_PTR(-EINVAL);
1844 if (idx >= genpd_data->num_domains) {
1845 pr_err("%s: invalid domain index %u\n", __func__, idx);
1846 return ERR_PTR(-EINVAL);
1849 if (!genpd_data->domains[idx])
1850 return ERR_PTR(-ENOENT);
1852 return genpd_data->domains[idx];
1856 * genpd_add_provider() - Register a PM domain provider for a node
1857 * @np: Device node pointer associated with the PM domain provider.
1858 * @xlate: Callback for decoding PM domain from phandle arguments.
1859 * @data: Context pointer for @xlate callback.
1861 static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
1864 struct of_genpd_provider *cp;
1866 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
1870 cp->node = of_node_get(np);
1874 mutex_lock(&of_genpd_mutex);
1875 list_add(&cp->link, &of_genpd_providers);
1876 mutex_unlock(&of_genpd_mutex);
1877 pr_debug("Added domain provider from %pOF\n", np);
1883 * of_genpd_add_provider_simple() - Register a simple PM domain provider
1884 * @np: Device node pointer associated with the PM domain provider.
1885 * @genpd: Pointer to PM domain associated with the PM domain provider.
1887 int of_genpd_add_provider_simple(struct device_node *np,
1888 struct generic_pm_domain *genpd)
1895 mutex_lock(&gpd_list_lock);
1897 if (!genpd_present(genpd))
1900 genpd->dev.of_node = np;
1902 /* Parse genpd OPP table */
1903 if (genpd->set_performance_state) {
1904 ret = dev_pm_opp_of_add_table(&genpd->dev);
1906 dev_err(&genpd->dev, "Failed to add OPP table: %d\n",
1912 ret = genpd_add_provider(np, genpd_xlate_simple, genpd);
1914 if (genpd->set_performance_state)
1915 dev_pm_opp_of_remove_table(&genpd->dev);
1920 genpd->provider = &np->fwnode;
1921 genpd->has_provider = true;
1924 mutex_unlock(&gpd_list_lock);
1928 EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple);
1931 * of_genpd_add_provider_onecell() - Register a onecell PM domain provider
1932 * @np: Device node pointer associated with the PM domain provider.
1933 * @data: Pointer to the data associated with the PM domain provider.
1935 int of_genpd_add_provider_onecell(struct device_node *np,
1936 struct genpd_onecell_data *data)
1938 struct generic_pm_domain *genpd;
1945 mutex_lock(&gpd_list_lock);
1948 data->xlate = genpd_xlate_onecell;
1950 for (i = 0; i < data->num_domains; i++) {
1951 genpd = data->domains[i];
1955 if (!genpd_present(genpd))
1958 genpd->dev.of_node = np;
1960 /* Parse genpd OPP table */
1961 if (genpd->set_performance_state) {
1962 ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i);
1964 dev_err(&genpd->dev, "Failed to add OPP table for index %d: %d\n",
1970 genpd->provider = &np->fwnode;
1971 genpd->has_provider = true;
1974 ret = genpd_add_provider(np, data->xlate, data);
1978 mutex_unlock(&gpd_list_lock);
1984 genpd = data->domains[i];
1989 genpd->provider = NULL;
1990 genpd->has_provider = false;
1992 if (genpd->set_performance_state)
1993 dev_pm_opp_of_remove_table(&genpd->dev);
1996 mutex_unlock(&gpd_list_lock);
2000 EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell);
2003 * of_genpd_del_provider() - Remove a previously registered PM domain provider
2004 * @np: Device node pointer associated with the PM domain provider
2006 void of_genpd_del_provider(struct device_node *np)
2008 struct of_genpd_provider *cp, *tmp;
2009 struct generic_pm_domain *gpd;
2011 mutex_lock(&gpd_list_lock);
2012 mutex_lock(&of_genpd_mutex);
2013 list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) {
2014 if (cp->node == np) {
2016 * For each PM domain associated with the
2017 * provider, set the 'has_provider' to false
2018 * so that the PM domain can be safely removed.
2020 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
2021 if (gpd->provider == &np->fwnode) {
2022 gpd->has_provider = false;
2024 if (!gpd->set_performance_state)
2027 dev_pm_opp_of_remove_table(&gpd->dev);
2031 list_del(&cp->link);
2032 of_node_put(cp->node);
2037 mutex_unlock(&of_genpd_mutex);
2038 mutex_unlock(&gpd_list_lock);
2040 EXPORT_SYMBOL_GPL(of_genpd_del_provider);
2043 * genpd_get_from_provider() - Look-up PM domain
2044 * @genpdspec: OF phandle args to use for look-up
2046 * Looks for a PM domain provider under the node specified by @genpdspec and if
2047 * found, uses xlate function of the provider to map phandle args to a PM
2050 * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
2053 static struct generic_pm_domain *genpd_get_from_provider(
2054 struct of_phandle_args *genpdspec)
2056 struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
2057 struct of_genpd_provider *provider;
2060 return ERR_PTR(-EINVAL);
2062 mutex_lock(&of_genpd_mutex);
2064 /* Check if we have such a provider in our array */
2065 list_for_each_entry(provider, &of_genpd_providers, link) {
2066 if (provider->node == genpdspec->np)
2067 genpd = provider->xlate(genpdspec, provider->data);
2072 mutex_unlock(&of_genpd_mutex);
2078 * of_genpd_add_device() - Add a device to an I/O PM domain
2079 * @genpdspec: OF phandle args to use for look-up PM domain
2080 * @dev: Device to be added.
2082 * Looks-up an I/O PM domain based upon phandle args provided and adds
2083 * the device to the PM domain. Returns a negative error code on failure.
2085 int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev)
2087 struct generic_pm_domain *genpd;
2090 mutex_lock(&gpd_list_lock);
2092 genpd = genpd_get_from_provider(genpdspec);
2093 if (IS_ERR(genpd)) {
2094 ret = PTR_ERR(genpd);
2098 ret = genpd_add_device(genpd, dev, NULL);
2101 mutex_unlock(&gpd_list_lock);
2105 EXPORT_SYMBOL_GPL(of_genpd_add_device);
2108 * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
2109 * @parent_spec: OF phandle args to use for parent PM domain look-up
2110 * @subdomain_spec: OF phandle args to use for subdomain look-up
2112 * Looks-up a parent PM domain and subdomain based upon phandle args
2113 * provided and adds the subdomain to the parent PM domain. Returns a
2114 * negative error code on failure.
2116 int of_genpd_add_subdomain(struct of_phandle_args *parent_spec,
2117 struct of_phandle_args *subdomain_spec)
2119 struct generic_pm_domain *parent, *subdomain;
2122 mutex_lock(&gpd_list_lock);
2124 parent = genpd_get_from_provider(parent_spec);
2125 if (IS_ERR(parent)) {
2126 ret = PTR_ERR(parent);
2130 subdomain = genpd_get_from_provider(subdomain_spec);
2131 if (IS_ERR(subdomain)) {
2132 ret = PTR_ERR(subdomain);
2136 ret = genpd_add_subdomain(parent, subdomain);
2139 mutex_unlock(&gpd_list_lock);
2143 EXPORT_SYMBOL_GPL(of_genpd_add_subdomain);
2146 * of_genpd_remove_last - Remove the last PM domain registered for a provider
2147 * @provider: Pointer to device structure associated with provider
2149 * Find the last PM domain that was added by a particular provider and
2150 * remove this PM domain from the list of PM domains. The provider is
2151 * identified by the 'provider' device structure that is passed. The PM
2152 * domain will only be removed, if the provider associated with domain
2155 * Returns a valid pointer to struct generic_pm_domain on success or
2156 * ERR_PTR() on failure.
2158 struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
2160 struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT);
2163 if (IS_ERR_OR_NULL(np))
2164 return ERR_PTR(-EINVAL);
2166 mutex_lock(&gpd_list_lock);
2167 list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) {
2168 if (gpd->provider == &np->fwnode) {
2169 ret = genpd_remove(gpd);
2170 genpd = ret ? ERR_PTR(ret) : gpd;
2174 mutex_unlock(&gpd_list_lock);
2178 EXPORT_SYMBOL_GPL(of_genpd_remove_last);
2180 static void genpd_release_dev(struct device *dev)
2185 static struct bus_type genpd_bus_type = {
2190 * genpd_dev_pm_detach - Detach a device from its PM domain.
2191 * @dev: Device to detach.
2192 * @power_off: Currently not used
2194 * Try to locate a corresponding generic PM domain, which the device was
2195 * attached to previously. If such is found, the device is detached from it.
2197 static void genpd_dev_pm_detach(struct device *dev, bool power_off)
2199 struct generic_pm_domain *pd;
2203 pd = dev_to_genpd(dev);
2207 dev_dbg(dev, "removing from PM domain %s\n", pd->name);
2209 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
2210 ret = genpd_remove_device(pd, dev);
2219 dev_err(dev, "failed to remove from PM domain %s: %d",
2224 /* Check if PM domain can be powered off after removing this device. */
2225 genpd_queue_power_off_work(pd);
2227 /* Unregister the device if it was created by genpd. */
2228 if (dev->bus == &genpd_bus_type)
2229 device_unregister(dev);
2232 static void genpd_dev_pm_sync(struct device *dev)
2234 struct generic_pm_domain *pd;
2236 pd = dev_to_genpd(dev);
2240 genpd_queue_power_off_work(pd);
2243 static int __genpd_dev_pm_attach(struct device *dev, struct device_node *np,
2244 unsigned int index, bool power_on)
2246 struct of_phandle_args pd_args;
2247 struct generic_pm_domain *pd;
2250 ret = of_parse_phandle_with_args(np, "power-domains",
2251 "#power-domain-cells", index, &pd_args);
2255 mutex_lock(&gpd_list_lock);
2256 pd = genpd_get_from_provider(&pd_args);
2257 of_node_put(pd_args.np);
2259 mutex_unlock(&gpd_list_lock);
2260 dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
2261 __func__, PTR_ERR(pd));
2262 return driver_deferred_probe_check_state(dev);
2265 dev_dbg(dev, "adding to PM domain %s\n", pd->name);
2267 ret = genpd_add_device(pd, dev, NULL);
2268 mutex_unlock(&gpd_list_lock);
2271 if (ret != -EPROBE_DEFER)
2272 dev_err(dev, "failed to add to PM domain %s: %d",
2277 dev->pm_domain->detach = genpd_dev_pm_detach;
2278 dev->pm_domain->sync = genpd_dev_pm_sync;
2282 ret = genpd_power_on(pd, 0);
2287 genpd_remove_device(pd, dev);
2289 return ret ? -EPROBE_DEFER : 1;
2293 * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
2294 * @dev: Device to attach.
2296 * Parse device's OF node to find a PM domain specifier. If such is found,
2297 * attaches the device to retrieved pm_domain ops.
2299 * Returns 1 on successfully attached PM domain, 0 when the device don't need a
2300 * PM domain or when multiple power-domains exists for it, else a negative error
2301 * code. Note that if a power-domain exists for the device, but it cannot be
2302 * found or turned on, then return -EPROBE_DEFER to ensure that the device is
2303 * not probed and to re-try again later.
2305 int genpd_dev_pm_attach(struct device *dev)
2311 * Devices with multiple PM domains must be attached separately, as we
2312 * can only attach one PM domain per device.
2314 if (of_count_phandle_with_args(dev->of_node, "power-domains",
2315 "#power-domain-cells") != 1)
2318 return __genpd_dev_pm_attach(dev, dev->of_node, 0, true);
2320 EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
2323 * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains.
2324 * @dev: The device used to lookup the PM domain.
2325 * @index: The index of the PM domain.
2327 * Parse device's OF node to find a PM domain specifier at the provided @index.
2328 * If such is found, creates a virtual device and attaches it to the retrieved
2329 * pm_domain ops. To deal with detaching of the virtual device, the ->detach()
2330 * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach().
2332 * Returns the created virtual device if successfully attached PM domain, NULL
2333 * when the device don't need a PM domain, else an ERR_PTR() in case of
2334 * failures. If a power-domain exists for the device, but cannot be found or
2335 * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device
2336 * is not probed and to re-try again later.
2338 struct device *genpd_dev_pm_attach_by_id(struct device *dev,
2341 struct device *virt_dev;
2348 /* Deal only with devices using multiple PM domains. */
2349 num_domains = of_count_phandle_with_args(dev->of_node, "power-domains",
2350 "#power-domain-cells");
2351 if (num_domains < 2 || index >= num_domains)
2354 /* Allocate and register device on the genpd bus. */
2355 virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL);
2357 return ERR_PTR(-ENOMEM);
2359 dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev));
2360 virt_dev->bus = &genpd_bus_type;
2361 virt_dev->release = genpd_release_dev;
2363 ret = device_register(virt_dev);
2366 return ERR_PTR(ret);
2369 /* Try to attach the device to the PM domain at the specified index. */
2370 ret = __genpd_dev_pm_attach(virt_dev, dev->of_node, index, false);
2372 device_unregister(virt_dev);
2373 return ret ? ERR_PTR(ret) : NULL;
2376 pm_runtime_enable(virt_dev);
2377 genpd_queue_power_off_work(dev_to_genpd(virt_dev));
2381 EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id);
2384 * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains.
2385 * @dev: The device used to lookup the PM domain.
2386 * @name: The name of the PM domain.
2388 * Parse device's OF node to find a PM domain specifier using the
2389 * power-domain-names DT property. For further description see
2390 * genpd_dev_pm_attach_by_id().
2392 struct device *genpd_dev_pm_attach_by_name(struct device *dev, char *name)
2399 index = of_property_match_string(dev->of_node, "power-domain-names",
2404 return genpd_dev_pm_attach_by_id(dev, index);
2407 static const struct of_device_id idle_state_match[] = {
2408 { .compatible = "domain-idle-state", },
2412 static int genpd_parse_state(struct genpd_power_state *genpd_state,
2413 struct device_node *state_node)
2417 u32 entry_latency, exit_latency;
2419 err = of_property_read_u32(state_node, "entry-latency-us",
2422 pr_debug(" * %pOF missing entry-latency-us property\n",
2427 err = of_property_read_u32(state_node, "exit-latency-us",
2430 pr_debug(" * %pOF missing exit-latency-us property\n",
2435 err = of_property_read_u32(state_node, "min-residency-us", &residency);
2437 genpd_state->residency_ns = 1000 * residency;
2439 genpd_state->power_on_latency_ns = 1000 * exit_latency;
2440 genpd_state->power_off_latency_ns = 1000 * entry_latency;
2441 genpd_state->fwnode = &state_node->fwnode;
2446 static int genpd_iterate_idle_states(struct device_node *dn,
2447 struct genpd_power_state *states)
2450 struct of_phandle_iterator it;
2451 struct device_node *np;
2454 ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL);
2458 /* Loop over the phandles until all the requested entry is found */
2459 of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) {
2461 if (!of_match_node(idle_state_match, np))
2464 ret = genpd_parse_state(&states[i], np);
2466 pr_err("Parsing idle state node %pOF failed with err %d\n",
2479 * of_genpd_parse_idle_states: Return array of idle states for the genpd.
2481 * @dn: The genpd device node
2482 * @states: The pointer to which the state array will be saved.
2483 * @n: The count of elements in the array returned from this function.
2485 * Returns the device states parsed from the OF node. The memory for the states
2486 * is allocated by this function and is the responsibility of the caller to
2487 * free the memory after use. If any or zero compatible domain idle states is
2488 * found it returns 0 and in case of errors, a negative error code is returned.
2490 int of_genpd_parse_idle_states(struct device_node *dn,
2491 struct genpd_power_state **states, int *n)
2493 struct genpd_power_state *st;
2496 ret = genpd_iterate_idle_states(dn, NULL);
2506 st = kcalloc(ret, sizeof(*st), GFP_KERNEL);
2510 ret = genpd_iterate_idle_states(dn, st);
2513 return ret < 0 ? ret : -EINVAL;
2521 EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states);
2524 * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node.
2526 * @genpd_dev: Genpd's device for which the performance-state needs to be found.
2527 * @opp: struct dev_pm_opp of the OPP for which we need to find performance
2530 * Returns performance state encoded in the OPP of the genpd. This calls
2531 * platform specific genpd->opp_to_performance_state() callback to translate
2532 * power domain OPP to performance state.
2534 * Returns performance state on success and 0 on failure.
2536 unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev,
2537 struct dev_pm_opp *opp)
2539 struct generic_pm_domain *genpd = NULL;
2542 genpd = container_of(genpd_dev, struct generic_pm_domain, dev);
2544 if (unlikely(!genpd->opp_to_performance_state))
2548 state = genpd->opp_to_performance_state(genpd, opp);
2549 genpd_unlock(genpd);
2553 EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state);
2556 * of_genpd_opp_to_performance_state- Gets performance state of device's
2557 * power domain corresponding to a DT node's "required-opps" property.
2559 * @dev: Device for which the performance-state needs to be found.
2560 * @np: DT node where the "required-opps" property is present. This can be
2561 * the device node itself (if it doesn't have an OPP table) or a node
2562 * within the OPP table of a device (if device has an OPP table).
2564 * Returns performance state corresponding to the "required-opps" property of
2565 * a DT node. This calls platform specific genpd->opp_to_performance_state()
2566 * callback to translate power domain OPP to performance state.
2568 * Returns performance state on success and 0 on failure.
2570 unsigned int of_genpd_opp_to_performance_state(struct device *dev,
2571 struct device_node *np)
2573 struct generic_pm_domain *genpd;
2574 struct dev_pm_opp *opp;
2577 genpd = dev_to_genpd(dev);
2581 if (unlikely(!genpd->set_performance_state))
2586 opp = of_dev_pm_opp_find_required_opp(&genpd->dev, np);
2588 dev_err(dev, "Failed to find required OPP: %ld\n",
2593 state = genpd->opp_to_performance_state(genpd, opp);
2594 dev_pm_opp_put(opp);
2597 genpd_unlock(genpd);
2601 EXPORT_SYMBOL_GPL(of_genpd_opp_to_performance_state);
2603 static int __init genpd_bus_init(void)
2605 return bus_register(&genpd_bus_type);
2607 core_initcall(genpd_bus_init);
2609 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
2612 /*** debugfs support ***/
2614 #ifdef CONFIG_DEBUG_FS
2615 #include <linux/pm.h>
2616 #include <linux/device.h>
2617 #include <linux/debugfs.h>
2618 #include <linux/seq_file.h>
2619 #include <linux/init.h>
2620 #include <linux/kobject.h>
2621 static struct dentry *genpd_debugfs_dir;
2624 * TODO: This function is a slightly modified version of rtpm_status_show
2625 * from sysfs.c, so generalize it.
2627 static void rtpm_status_str(struct seq_file *s, struct device *dev)
2629 static const char * const status_lookup[] = {
2630 [RPM_ACTIVE] = "active",
2631 [RPM_RESUMING] = "resuming",
2632 [RPM_SUSPENDED] = "suspended",
2633 [RPM_SUSPENDING] = "suspending"
2637 if (dev->power.runtime_error)
2639 else if (dev->power.disable_depth)
2641 else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup))
2642 p = status_lookup[dev->power.runtime_status];
2649 static int genpd_summary_one(struct seq_file *s,
2650 struct generic_pm_domain *genpd)
2652 static const char * const status_lookup[] = {
2653 [GPD_STATE_ACTIVE] = "on",
2654 [GPD_STATE_POWER_OFF] = "off"
2656 struct pm_domain_data *pm_data;
2657 const char *kobj_path;
2658 struct gpd_link *link;
2662 ret = genpd_lock_interruptible(genpd);
2664 return -ERESTARTSYS;
2666 if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup)))
2668 if (!genpd_status_on(genpd))
2669 snprintf(state, sizeof(state), "%s-%u",
2670 status_lookup[genpd->status], genpd->state_idx);
2672 snprintf(state, sizeof(state), "%s",
2673 status_lookup[genpd->status]);
2674 seq_printf(s, "%-30s %-15s ", genpd->name, state);
2677 * Modifications on the list require holding locks on both
2678 * master and slave, so we are safe.
2679 * Also genpd->name is immutable.
2681 list_for_each_entry(link, &genpd->master_links, master_node) {
2682 seq_printf(s, "%s", link->slave->name);
2683 if (!list_is_last(&link->master_node, &genpd->master_links))
2687 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
2688 kobj_path = kobject_get_path(&pm_data->dev->kobj,
2689 genpd_is_irq_safe(genpd) ?
2690 GFP_ATOMIC : GFP_KERNEL);
2691 if (kobj_path == NULL)
2694 seq_printf(s, "\n %-50s ", kobj_path);
2695 rtpm_status_str(s, pm_data->dev);
2701 genpd_unlock(genpd);
2706 static int genpd_summary_show(struct seq_file *s, void *data)
2708 struct generic_pm_domain *genpd;
2711 seq_puts(s, "domain status slaves\n");
2712 seq_puts(s, " /device runtime status\n");
2713 seq_puts(s, "----------------------------------------------------------------------\n");
2715 ret = mutex_lock_interruptible(&gpd_list_lock);
2717 return -ERESTARTSYS;
2719 list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
2720 ret = genpd_summary_one(s, genpd);
2724 mutex_unlock(&gpd_list_lock);
2729 static int genpd_status_show(struct seq_file *s, void *data)
2731 static const char * const status_lookup[] = {
2732 [GPD_STATE_ACTIVE] = "on",
2733 [GPD_STATE_POWER_OFF] = "off"
2736 struct generic_pm_domain *genpd = s->private;
2739 ret = genpd_lock_interruptible(genpd);
2741 return -ERESTARTSYS;
2743 if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup)))
2746 if (genpd->status == GPD_STATE_POWER_OFF)
2747 seq_printf(s, "%s-%u\n", status_lookup[genpd->status],
2750 seq_printf(s, "%s\n", status_lookup[genpd->status]);
2752 genpd_unlock(genpd);
2756 static int genpd_sub_domains_show(struct seq_file *s, void *data)
2758 struct generic_pm_domain *genpd = s->private;
2759 struct gpd_link *link;
2762 ret = genpd_lock_interruptible(genpd);
2764 return -ERESTARTSYS;
2766 list_for_each_entry(link, &genpd->master_links, master_node)
2767 seq_printf(s, "%s\n", link->slave->name);
2769 genpd_unlock(genpd);
2773 static int genpd_idle_states_show(struct seq_file *s, void *data)
2775 struct generic_pm_domain *genpd = s->private;
2779 ret = genpd_lock_interruptible(genpd);
2781 return -ERESTARTSYS;
2783 seq_puts(s, "State Time Spent(ms)\n");
2785 for (i = 0; i < genpd->state_count; i++) {
2789 if ((genpd->status == GPD_STATE_POWER_OFF) &&
2790 (genpd->state_idx == i))
2791 delta = ktime_sub(ktime_get(), genpd->accounting_time);
2793 msecs = ktime_to_ms(
2794 ktime_add(genpd->states[i].idle_time, delta));
2795 seq_printf(s, "S%-13i %lld\n", i, msecs);
2798 genpd_unlock(genpd);
2802 static int genpd_active_time_show(struct seq_file *s, void *data)
2804 struct generic_pm_domain *genpd = s->private;
2808 ret = genpd_lock_interruptible(genpd);
2810 return -ERESTARTSYS;
2812 if (genpd->status == GPD_STATE_ACTIVE)
2813 delta = ktime_sub(ktime_get(), genpd->accounting_time);
2815 seq_printf(s, "%lld ms\n", ktime_to_ms(
2816 ktime_add(genpd->on_time, delta)));
2818 genpd_unlock(genpd);
2822 static int genpd_total_idle_time_show(struct seq_file *s, void *data)
2824 struct generic_pm_domain *genpd = s->private;
2825 ktime_t delta = 0, total = 0;
2829 ret = genpd_lock_interruptible(genpd);
2831 return -ERESTARTSYS;
2833 for (i = 0; i < genpd->state_count; i++) {
2835 if ((genpd->status == GPD_STATE_POWER_OFF) &&
2836 (genpd->state_idx == i))
2837 delta = ktime_sub(ktime_get(), genpd->accounting_time);
2839 total = ktime_add(total, genpd->states[i].idle_time);
2841 total = ktime_add(total, delta);
2843 seq_printf(s, "%lld ms\n", ktime_to_ms(total));
2845 genpd_unlock(genpd);
2850 static int genpd_devices_show(struct seq_file *s, void *data)
2852 struct generic_pm_domain *genpd = s->private;
2853 struct pm_domain_data *pm_data;
2854 const char *kobj_path;
2857 ret = genpd_lock_interruptible(genpd);
2859 return -ERESTARTSYS;
2861 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
2862 kobj_path = kobject_get_path(&pm_data->dev->kobj,
2863 genpd_is_irq_safe(genpd) ?
2864 GFP_ATOMIC : GFP_KERNEL);
2865 if (kobj_path == NULL)
2868 seq_printf(s, "%s\n", kobj_path);
2872 genpd_unlock(genpd);
2876 static int genpd_perf_state_show(struct seq_file *s, void *data)
2878 struct generic_pm_domain *genpd = s->private;
2880 if (genpd_lock_interruptible(genpd))
2881 return -ERESTARTSYS;
2883 seq_printf(s, "%u\n", genpd->performance_state);
2885 genpd_unlock(genpd);
2889 #define define_genpd_open_function(name) \
2890 static int genpd_##name##_open(struct inode *inode, struct file *file) \
2892 return single_open(file, genpd_##name##_show, inode->i_private); \
2895 define_genpd_open_function(summary);
2896 define_genpd_open_function(status);
2897 define_genpd_open_function(sub_domains);
2898 define_genpd_open_function(idle_states);
2899 define_genpd_open_function(active_time);
2900 define_genpd_open_function(total_idle_time);
2901 define_genpd_open_function(devices);
2902 define_genpd_open_function(perf_state);
2904 #define define_genpd_debugfs_fops(name) \
2905 static const struct file_operations genpd_##name##_fops = { \
2906 .open = genpd_##name##_open, \
2908 .llseek = seq_lseek, \
2909 .release = single_release, \
2912 define_genpd_debugfs_fops(summary);
2913 define_genpd_debugfs_fops(status);
2914 define_genpd_debugfs_fops(sub_domains);
2915 define_genpd_debugfs_fops(idle_states);
2916 define_genpd_debugfs_fops(active_time);
2917 define_genpd_debugfs_fops(total_idle_time);
2918 define_genpd_debugfs_fops(devices);
2919 define_genpd_debugfs_fops(perf_state);
2921 static int __init genpd_debug_init(void)
2924 struct generic_pm_domain *genpd;
2926 genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL);
2928 if (!genpd_debugfs_dir)
2931 d = debugfs_create_file("pm_genpd_summary", S_IRUGO,
2932 genpd_debugfs_dir, NULL, &genpd_summary_fops);
2936 list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
2937 d = debugfs_create_dir(genpd->name, genpd_debugfs_dir);
2941 debugfs_create_file("current_state", 0444,
2942 d, genpd, &genpd_status_fops);
2943 debugfs_create_file("sub_domains", 0444,
2944 d, genpd, &genpd_sub_domains_fops);
2945 debugfs_create_file("idle_states", 0444,
2946 d, genpd, &genpd_idle_states_fops);
2947 debugfs_create_file("active_time", 0444,
2948 d, genpd, &genpd_active_time_fops);
2949 debugfs_create_file("total_idle_time", 0444,
2950 d, genpd, &genpd_total_idle_time_fops);
2951 debugfs_create_file("devices", 0444,
2952 d, genpd, &genpd_devices_fops);
2953 if (genpd->set_performance_state)
2954 debugfs_create_file("perf_state", 0444,
2955 d, genpd, &genpd_perf_state_fops);
2960 late_initcall(genpd_debug_init);
2962 static void __exit genpd_debug_exit(void)
2964 debugfs_remove_recursive(genpd_debugfs_dir);
2966 __exitcall(genpd_debug_exit);
2967 #endif /* CONFIG_DEBUG_FS */