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
);
742 ret
= pm_generic_prepare(dev
);
744 mutex_lock(&genpd
->lock
);
746 genpd
->prepared_count
--;
748 mutex_unlock(&genpd
->lock
);
755 * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
756 * @dev: Device to suspend.
758 * Stop the device and remove power from the domain if all devices in it have
761 static int pm_genpd_suspend_noirq(struct device
*dev
)
763 struct generic_pm_domain
*genpd
;
766 dev_dbg(dev
, "%s()\n", __func__
);
768 genpd
= dev_to_genpd(dev
);
772 if (dev
->power
.wakeup_path
&& genpd_dev_active_wakeup(genpd
, dev
))
775 if (genpd
->dev_ops
.stop
&& genpd
->dev_ops
.start
) {
776 ret
= pm_runtime_force_suspend(dev
);
782 * Since all of the "noirq" callbacks are executed sequentially, it is
783 * guaranteed that this function will never run twice in parallel for
784 * the same PM domain, so it is not necessary to use locking here.
786 genpd
->suspended_count
++;
787 pm_genpd_sync_poweroff(genpd
, true);
793 * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain.
794 * @dev: Device to resume.
796 * Restore power to the device's PM domain, if necessary, and start the device.
798 static int pm_genpd_resume_noirq(struct device
*dev
)
800 struct generic_pm_domain
*genpd
;
803 dev_dbg(dev
, "%s()\n", __func__
);
805 genpd
= dev_to_genpd(dev
);
809 if (dev
->power
.wakeup_path
&& genpd_dev_active_wakeup(genpd
, dev
))
813 * Since all of the "noirq" callbacks are executed sequentially, it is
814 * guaranteed that this function will never run twice in parallel for
815 * the same PM domain, so it is not necessary to use locking here.
817 pm_genpd_sync_poweron(genpd
, true);
818 genpd
->suspended_count
--;
820 if (genpd
->dev_ops
.stop
&& genpd
->dev_ops
.start
)
821 ret
= pm_runtime_force_resume(dev
);
827 * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
828 * @dev: Device to freeze.
830 * Carry out a late freeze of a device under the assumption that its
831 * pm_domain field points to the domain member of an object of type
832 * struct generic_pm_domain representing a power domain consisting of I/O
835 static int pm_genpd_freeze_noirq(struct device
*dev
)
837 struct generic_pm_domain
*genpd
;
840 dev_dbg(dev
, "%s()\n", __func__
);
842 genpd
= dev_to_genpd(dev
);
846 if (genpd
->dev_ops
.stop
&& genpd
->dev_ops
.start
)
847 ret
= pm_runtime_force_suspend(dev
);
853 * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
854 * @dev: Device to thaw.
856 * Start the device, unless power has been removed from the domain already
857 * before the system transition.
859 static int pm_genpd_thaw_noirq(struct device
*dev
)
861 struct generic_pm_domain
*genpd
;
864 dev_dbg(dev
, "%s()\n", __func__
);
866 genpd
= dev_to_genpd(dev
);
870 if (genpd
->dev_ops
.stop
&& genpd
->dev_ops
.start
)
871 ret
= pm_runtime_force_resume(dev
);
877 * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain.
878 * @dev: Device to resume.
880 * Make sure the domain will be in the same power state as before the
881 * hibernation the system is resuming from and start the device if necessary.
883 static int pm_genpd_restore_noirq(struct device
*dev
)
885 struct generic_pm_domain
*genpd
;
888 dev_dbg(dev
, "%s()\n", __func__
);
890 genpd
= dev_to_genpd(dev
);
895 * Since all of the "noirq" callbacks are executed sequentially, it is
896 * guaranteed that this function will never run twice in parallel for
897 * the same PM domain, so it is not necessary to use locking here.
899 * At this point suspended_count == 0 means we are being run for the
900 * first time for the given domain in the present cycle.
902 if (genpd
->suspended_count
++ == 0)
904 * The boot kernel might put the domain into arbitrary state,
905 * so make it appear as powered off to pm_genpd_sync_poweron(),
906 * so that it tries to power it on in case it was really off.
908 genpd
->status
= GPD_STATE_POWER_OFF
;
910 pm_genpd_sync_poweron(genpd
, true);
912 if (genpd
->dev_ops
.stop
&& genpd
->dev_ops
.start
)
913 ret
= pm_runtime_force_resume(dev
);
919 * pm_genpd_complete - Complete power transition of a device in a power domain.
920 * @dev: Device to complete the transition of.
922 * Complete a power transition of a device (during a system-wide power
923 * transition) under the assumption that its pm_domain field points to the
924 * domain member of an object of type struct generic_pm_domain representing
925 * a power domain consisting of I/O devices.
927 static void pm_genpd_complete(struct device
*dev
)
929 struct generic_pm_domain
*genpd
;
931 dev_dbg(dev
, "%s()\n", __func__
);
933 genpd
= dev_to_genpd(dev
);
937 pm_generic_complete(dev
);
939 mutex_lock(&genpd
->lock
);
941 genpd
->prepared_count
--;
942 if (!genpd
->prepared_count
)
943 genpd_queue_power_off_work(genpd
);
945 mutex_unlock(&genpd
->lock
);
949 * genpd_syscore_switch - Switch power during system core suspend or resume.
950 * @dev: Device that normally is marked as "always on" to switch power for.
952 * This routine may only be called during the system core (syscore) suspend or
953 * resume phase for devices whose "always on" flags are set.
955 static void genpd_syscore_switch(struct device
*dev
, bool suspend
)
957 struct generic_pm_domain
*genpd
;
959 genpd
= dev_to_genpd(dev
);
960 if (!pm_genpd_present(genpd
))
964 genpd
->suspended_count
++;
965 pm_genpd_sync_poweroff(genpd
, false);
967 pm_genpd_sync_poweron(genpd
, false);
968 genpd
->suspended_count
--;
972 void pm_genpd_syscore_poweroff(struct device
*dev
)
974 genpd_syscore_switch(dev
, true);
976 EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff
);
978 void pm_genpd_syscore_poweron(struct device
*dev
)
980 genpd_syscore_switch(dev
, false);
982 EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron
);
984 #else /* !CONFIG_PM_SLEEP */
986 #define pm_genpd_prepare NULL
987 #define pm_genpd_suspend_noirq NULL
988 #define pm_genpd_resume_noirq NULL
989 #define pm_genpd_freeze_noirq NULL
990 #define pm_genpd_thaw_noirq NULL
991 #define pm_genpd_restore_noirq NULL
992 #define pm_genpd_complete NULL
994 #endif /* CONFIG_PM_SLEEP */
996 static struct generic_pm_domain_data
*genpd_alloc_dev_data(struct device
*dev
,
997 struct generic_pm_domain
*genpd
,
998 struct gpd_timing_data
*td
)
1000 struct generic_pm_domain_data
*gpd_data
;
1003 ret
= dev_pm_get_subsys_data(dev
);
1005 return ERR_PTR(ret
);
1007 gpd_data
= kzalloc(sizeof(*gpd_data
), GFP_KERNEL
);
1016 gpd_data
->base
.dev
= dev
;
1017 gpd_data
->td
.constraint_changed
= true;
1018 gpd_data
->td
.effective_constraint_ns
= -1;
1019 gpd_data
->nb
.notifier_call
= genpd_dev_pm_qos_notifier
;
1021 spin_lock_irq(&dev
->power
.lock
);
1023 if (dev
->power
.subsys_data
->domain_data
) {
1028 dev
->power
.subsys_data
->domain_data
= &gpd_data
->base
;
1030 spin_unlock_irq(&dev
->power
.lock
);
1032 dev_pm_domain_set(dev
, &genpd
->domain
);
1037 spin_unlock_irq(&dev
->power
.lock
);
1040 dev_pm_put_subsys_data(dev
);
1041 return ERR_PTR(ret
);
1044 static void genpd_free_dev_data(struct device
*dev
,
1045 struct generic_pm_domain_data
*gpd_data
)
1047 dev_pm_domain_set(dev
, NULL
);
1049 spin_lock_irq(&dev
->power
.lock
);
1051 dev
->power
.subsys_data
->domain_data
= NULL
;
1053 spin_unlock_irq(&dev
->power
.lock
);
1056 dev_pm_put_subsys_data(dev
);
1060 * __pm_genpd_add_device - Add a device to an I/O PM domain.
1061 * @genpd: PM domain to add the device to.
1062 * @dev: Device to be added.
1063 * @td: Set of PM QoS timing parameters to attach to the device.
1065 int __pm_genpd_add_device(struct generic_pm_domain
*genpd
, struct device
*dev
,
1066 struct gpd_timing_data
*td
)
1068 struct generic_pm_domain_data
*gpd_data
;
1071 dev_dbg(dev
, "%s()\n", __func__
);
1073 if (IS_ERR_OR_NULL(genpd
) || IS_ERR_OR_NULL(dev
))
1076 gpd_data
= genpd_alloc_dev_data(dev
, genpd
, td
);
1077 if (IS_ERR(gpd_data
))
1078 return PTR_ERR(gpd_data
);
1080 mutex_lock(&genpd
->lock
);
1082 if (genpd
->prepared_count
> 0) {
1087 ret
= genpd
->attach_dev
? genpd
->attach_dev(genpd
, dev
) : 0;
1091 genpd
->device_count
++;
1092 genpd
->max_off_time_changed
= true;
1094 list_add_tail(&gpd_data
->base
.list_node
, &genpd
->dev_list
);
1097 mutex_unlock(&genpd
->lock
);
1100 genpd_free_dev_data(dev
, gpd_data
);
1102 dev_pm_qos_add_notifier(dev
, &gpd_data
->nb
);
1106 EXPORT_SYMBOL_GPL(__pm_genpd_add_device
);
1109 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
1110 * @genpd: PM domain to remove the device from.
1111 * @dev: Device to be removed.
1113 int pm_genpd_remove_device(struct generic_pm_domain
*genpd
,
1116 struct generic_pm_domain_data
*gpd_data
;
1117 struct pm_domain_data
*pdd
;
1120 dev_dbg(dev
, "%s()\n", __func__
);
1122 if (!genpd
|| genpd
!= pm_genpd_lookup_dev(dev
))
1125 /* The above validation also means we have existing domain_data. */
1126 pdd
= dev
->power
.subsys_data
->domain_data
;
1127 gpd_data
= to_gpd_data(pdd
);
1128 dev_pm_qos_remove_notifier(dev
, &gpd_data
->nb
);
1130 mutex_lock(&genpd
->lock
);
1132 if (genpd
->prepared_count
> 0) {
1137 genpd
->device_count
--;
1138 genpd
->max_off_time_changed
= true;
1140 if (genpd
->detach_dev
)
1141 genpd
->detach_dev(genpd
, dev
);
1143 list_del_init(&pdd
->list_node
);
1145 mutex_unlock(&genpd
->lock
);
1147 genpd_free_dev_data(dev
, gpd_data
);
1152 mutex_unlock(&genpd
->lock
);
1153 dev_pm_qos_add_notifier(dev
, &gpd_data
->nb
);
1157 EXPORT_SYMBOL_GPL(pm_genpd_remove_device
);
1160 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
1161 * @genpd: Master PM domain to add the subdomain to.
1162 * @subdomain: Subdomain to be added.
1164 int pm_genpd_add_subdomain(struct generic_pm_domain
*genpd
,
1165 struct generic_pm_domain
*subdomain
)
1167 struct gpd_link
*link
, *itr
;
1170 if (IS_ERR_OR_NULL(genpd
) || IS_ERR_OR_NULL(subdomain
)
1171 || genpd
== subdomain
)
1174 link
= kzalloc(sizeof(*link
), GFP_KERNEL
);
1178 mutex_lock(&subdomain
->lock
);
1179 mutex_lock_nested(&genpd
->lock
, SINGLE_DEPTH_NESTING
);
1181 if (genpd
->status
== GPD_STATE_POWER_OFF
1182 && subdomain
->status
!= GPD_STATE_POWER_OFF
) {
1187 list_for_each_entry(itr
, &genpd
->master_links
, master_node
) {
1188 if (itr
->slave
== subdomain
&& itr
->master
== genpd
) {
1194 link
->master
= genpd
;
1195 list_add_tail(&link
->master_node
, &genpd
->master_links
);
1196 link
->slave
= subdomain
;
1197 list_add_tail(&link
->slave_node
, &subdomain
->slave_links
);
1198 if (subdomain
->status
!= GPD_STATE_POWER_OFF
)
1199 genpd_sd_counter_inc(genpd
);
1202 mutex_unlock(&genpd
->lock
);
1203 mutex_unlock(&subdomain
->lock
);
1208 EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain
);
1211 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
1212 * @genpd: Master PM domain to remove the subdomain from.
1213 * @subdomain: Subdomain to be removed.
1215 int pm_genpd_remove_subdomain(struct generic_pm_domain
*genpd
,
1216 struct generic_pm_domain
*subdomain
)
1218 struct gpd_link
*link
;
1221 if (IS_ERR_OR_NULL(genpd
) || IS_ERR_OR_NULL(subdomain
))
1224 mutex_lock(&subdomain
->lock
);
1225 mutex_lock_nested(&genpd
->lock
, SINGLE_DEPTH_NESTING
);
1227 if (!list_empty(&subdomain
->master_links
) || subdomain
->device_count
) {
1228 pr_warn("%s: unable to remove subdomain %s\n", genpd
->name
,
1234 list_for_each_entry(link
, &genpd
->master_links
, master_node
) {
1235 if (link
->slave
!= subdomain
)
1238 list_del(&link
->master_node
);
1239 list_del(&link
->slave_node
);
1241 if (subdomain
->status
!= GPD_STATE_POWER_OFF
)
1242 genpd_sd_counter_dec(genpd
);
1249 mutex_unlock(&genpd
->lock
);
1250 mutex_unlock(&subdomain
->lock
);
1254 EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain
);
1257 * pm_genpd_init - Initialize a generic I/O PM domain object.
1258 * @genpd: PM domain object to initialize.
1259 * @gov: PM domain governor to associate with the domain (may be NULL).
1260 * @is_off: Initial value of the domain's power_is_off field.
1262 * Returns 0 on successful initialization, else a negative error code.
1264 int pm_genpd_init(struct generic_pm_domain
*genpd
,
1265 struct dev_power_governor
*gov
, bool is_off
)
1267 if (IS_ERR_OR_NULL(genpd
))
1270 INIT_LIST_HEAD(&genpd
->master_links
);
1271 INIT_LIST_HEAD(&genpd
->slave_links
);
1272 INIT_LIST_HEAD(&genpd
->dev_list
);
1273 mutex_init(&genpd
->lock
);
1275 INIT_WORK(&genpd
->power_off_work
, genpd_power_off_work_fn
);
1276 atomic_set(&genpd
->sd_count
, 0);
1277 genpd
->status
= is_off
? GPD_STATE_POWER_OFF
: GPD_STATE_ACTIVE
;
1278 genpd
->device_count
= 0;
1279 genpd
->max_off_time_ns
= -1;
1280 genpd
->max_off_time_changed
= true;
1281 genpd
->domain
.ops
.runtime_suspend
= genpd_runtime_suspend
;
1282 genpd
->domain
.ops
.runtime_resume
= genpd_runtime_resume
;
1283 genpd
->domain
.ops
.prepare
= pm_genpd_prepare
;
1284 genpd
->domain
.ops
.suspend
= pm_generic_suspend
;
1285 genpd
->domain
.ops
.suspend_late
= pm_generic_suspend_late
;
1286 genpd
->domain
.ops
.suspend_noirq
= pm_genpd_suspend_noirq
;
1287 genpd
->domain
.ops
.resume_noirq
= pm_genpd_resume_noirq
;
1288 genpd
->domain
.ops
.resume_early
= pm_generic_resume_early
;
1289 genpd
->domain
.ops
.resume
= pm_generic_resume
;
1290 genpd
->domain
.ops
.freeze
= pm_generic_freeze
;
1291 genpd
->domain
.ops
.freeze_late
= pm_generic_freeze_late
;
1292 genpd
->domain
.ops
.freeze_noirq
= pm_genpd_freeze_noirq
;
1293 genpd
->domain
.ops
.thaw_noirq
= pm_genpd_thaw_noirq
;
1294 genpd
->domain
.ops
.thaw_early
= pm_generic_thaw_early
;
1295 genpd
->domain
.ops
.thaw
= pm_generic_thaw
;
1296 genpd
->domain
.ops
.poweroff
= pm_generic_poweroff
;
1297 genpd
->domain
.ops
.poweroff_late
= pm_generic_poweroff_late
;
1298 genpd
->domain
.ops
.poweroff_noirq
= pm_genpd_suspend_noirq
;
1299 genpd
->domain
.ops
.restore_noirq
= pm_genpd_restore_noirq
;
1300 genpd
->domain
.ops
.restore_early
= pm_generic_restore_early
;
1301 genpd
->domain
.ops
.restore
= pm_generic_restore
;
1302 genpd
->domain
.ops
.complete
= pm_genpd_complete
;
1304 if (genpd
->flags
& GENPD_FLAG_PM_CLK
) {
1305 genpd
->dev_ops
.stop
= pm_clk_suspend
;
1306 genpd
->dev_ops
.start
= pm_clk_resume
;
1309 if (genpd
->state_idx
>= GENPD_MAX_NUM_STATES
) {
1310 pr_warn("Initial state index out of bounds.\n");
1311 genpd
->state_idx
= GENPD_MAX_NUM_STATES
- 1;
1314 if (genpd
->state_count
> GENPD_MAX_NUM_STATES
) {
1315 pr_warn("Limiting states to %d\n", GENPD_MAX_NUM_STATES
);
1316 genpd
->state_count
= GENPD_MAX_NUM_STATES
;
1319 /* Use only one "off" state if there were no states declared */
1320 if (genpd
->state_count
== 0)
1321 genpd
->state_count
= 1;
1323 mutex_lock(&gpd_list_lock
);
1324 list_add(&genpd
->gpd_list_node
, &gpd_list
);
1325 mutex_unlock(&gpd_list_lock
);
1329 EXPORT_SYMBOL_GPL(pm_genpd_init
);
1331 #ifdef CONFIG_PM_GENERIC_DOMAINS_OF
1333 * Device Tree based PM domain providers.
1335 * The code below implements generic device tree based PM domain providers that
1336 * bind device tree nodes with generic PM domains registered in the system.
1338 * Any driver that registers generic PM domains and needs to support binding of
1339 * devices to these domains is supposed to register a PM domain provider, which
1340 * maps a PM domain specifier retrieved from the device tree to a PM domain.
1342 * Two simple mapping functions have been provided for convenience:
1343 * - __of_genpd_xlate_simple() for 1:1 device tree node to PM domain mapping.
1344 * - __of_genpd_xlate_onecell() for mapping of multiple PM domains per node by
1349 * struct of_genpd_provider - PM domain provider registration structure
1350 * @link: Entry in global list of PM domain providers
1351 * @node: Pointer to device tree node of PM domain provider
1352 * @xlate: Provider-specific xlate callback mapping a set of specifier cells
1354 * @data: context pointer to be passed into @xlate callback
1356 struct of_genpd_provider
{
1357 struct list_head link
;
1358 struct device_node
*node
;
1359 genpd_xlate_t xlate
;
1363 /* List of registered PM domain providers. */
1364 static LIST_HEAD(of_genpd_providers
);
1365 /* Mutex to protect the list above. */
1366 static DEFINE_MUTEX(of_genpd_mutex
);
1369 * __of_genpd_xlate_simple() - Xlate function for direct node-domain mapping
1370 * @genpdspec: OF phandle args to map into a PM domain
1371 * @data: xlate function private data - pointer to struct generic_pm_domain
1373 * This is a generic xlate function that can be used to model PM domains that
1374 * have their own device tree nodes. The private data of xlate function needs
1375 * to be a valid pointer to struct generic_pm_domain.
1377 struct generic_pm_domain
*__of_genpd_xlate_simple(
1378 struct of_phandle_args
*genpdspec
,
1381 if (genpdspec
->args_count
!= 0)
1382 return ERR_PTR(-EINVAL
);
1385 EXPORT_SYMBOL_GPL(__of_genpd_xlate_simple
);
1388 * __of_genpd_xlate_onecell() - Xlate function using a single index.
1389 * @genpdspec: OF phandle args to map into a PM domain
1390 * @data: xlate function private data - pointer to struct genpd_onecell_data
1392 * This is a generic xlate function that can be used to model simple PM domain
1393 * controllers that have one device tree node and provide multiple PM domains.
1394 * A single cell is used as an index into an array of PM domains specified in
1395 * the genpd_onecell_data struct when registering the provider.
1397 struct generic_pm_domain
*__of_genpd_xlate_onecell(
1398 struct of_phandle_args
*genpdspec
,
1401 struct genpd_onecell_data
*genpd_data
= data
;
1402 unsigned int idx
= genpdspec
->args
[0];
1404 if (genpdspec
->args_count
!= 1)
1405 return ERR_PTR(-EINVAL
);
1407 if (idx
>= genpd_data
->num_domains
) {
1408 pr_err("%s: invalid domain index %u\n", __func__
, idx
);
1409 return ERR_PTR(-EINVAL
);
1412 if (!genpd_data
->domains
[idx
])
1413 return ERR_PTR(-ENOENT
);
1415 return genpd_data
->domains
[idx
];
1417 EXPORT_SYMBOL_GPL(__of_genpd_xlate_onecell
);
1420 * __of_genpd_add_provider() - Register a PM domain provider for a node
1421 * @np: Device node pointer associated with the PM domain provider.
1422 * @xlate: Callback for decoding PM domain from phandle arguments.
1423 * @data: Context pointer for @xlate callback.
1425 int __of_genpd_add_provider(struct device_node
*np
, genpd_xlate_t xlate
,
1428 struct of_genpd_provider
*cp
;
1430 cp
= kzalloc(sizeof(*cp
), GFP_KERNEL
);
1434 cp
->node
= of_node_get(np
);
1438 mutex_lock(&of_genpd_mutex
);
1439 list_add(&cp
->link
, &of_genpd_providers
);
1440 mutex_unlock(&of_genpd_mutex
);
1441 pr_debug("Added domain provider from %s\n", np
->full_name
);
1445 EXPORT_SYMBOL_GPL(__of_genpd_add_provider
);
1448 * of_genpd_del_provider() - Remove a previously registered PM domain provider
1449 * @np: Device node pointer associated with the PM domain provider
1451 void of_genpd_del_provider(struct device_node
*np
)
1453 struct of_genpd_provider
*cp
;
1455 mutex_lock(&of_genpd_mutex
);
1456 list_for_each_entry(cp
, &of_genpd_providers
, link
) {
1457 if (cp
->node
== np
) {
1458 list_del(&cp
->link
);
1459 of_node_put(cp
->node
);
1464 mutex_unlock(&of_genpd_mutex
);
1466 EXPORT_SYMBOL_GPL(of_genpd_del_provider
);
1469 * of_genpd_get_from_provider() - Look-up PM domain
1470 * @genpdspec: OF phandle args to use for look-up
1472 * Looks for a PM domain provider under the node specified by @genpdspec and if
1473 * found, uses xlate function of the provider to map phandle args to a PM
1476 * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
1479 struct generic_pm_domain
*of_genpd_get_from_provider(
1480 struct of_phandle_args
*genpdspec
)
1482 struct generic_pm_domain
*genpd
= ERR_PTR(-ENOENT
);
1483 struct of_genpd_provider
*provider
;
1486 return ERR_PTR(-EINVAL
);
1488 mutex_lock(&of_genpd_mutex
);
1490 /* Check if we have such a provider in our array */
1491 list_for_each_entry(provider
, &of_genpd_providers
, link
) {
1492 if (provider
->node
== genpdspec
->np
)
1493 genpd
= provider
->xlate(genpdspec
, provider
->data
);
1498 mutex_unlock(&of_genpd_mutex
);
1502 EXPORT_SYMBOL_GPL(of_genpd_get_from_provider
);
1505 * genpd_dev_pm_detach - Detach a device from its PM domain.
1506 * @dev: Device to detach.
1507 * @power_off: Currently not used
1509 * Try to locate a corresponding generic PM domain, which the device was
1510 * attached to previously. If such is found, the device is detached from it.
1512 static void genpd_dev_pm_detach(struct device
*dev
, bool power_off
)
1514 struct generic_pm_domain
*pd
;
1518 pd
= pm_genpd_lookup_dev(dev
);
1522 dev_dbg(dev
, "removing from PM domain %s\n", pd
->name
);
1524 for (i
= 1; i
< GENPD_RETRY_MAX_MS
; i
<<= 1) {
1525 ret
= pm_genpd_remove_device(pd
, dev
);
1534 dev_err(dev
, "failed to remove from PM domain %s: %d",
1539 /* Check if PM domain can be powered off after removing this device. */
1540 genpd_queue_power_off_work(pd
);
1543 static void genpd_dev_pm_sync(struct device
*dev
)
1545 struct generic_pm_domain
*pd
;
1547 pd
= dev_to_genpd(dev
);
1551 genpd_queue_power_off_work(pd
);
1555 * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
1556 * @dev: Device to attach.
1558 * Parse device's OF node to find a PM domain specifier. If such is found,
1559 * attaches the device to retrieved pm_domain ops.
1561 * Both generic and legacy Samsung-specific DT bindings are supported to keep
1562 * backwards compatibility with existing DTBs.
1564 * Returns 0 on successfully attached PM domain or negative error code. Note
1565 * that if a power-domain exists for the device, but it cannot be found or
1566 * turned on, then return -EPROBE_DEFER to ensure that the device is not
1567 * probed and to re-try again later.
1569 int genpd_dev_pm_attach(struct device
*dev
)
1571 struct of_phandle_args pd_args
;
1572 struct generic_pm_domain
*pd
;
1582 ret
= of_parse_phandle_with_args(dev
->of_node
, "power-domains",
1583 "#power-domain-cells", 0, &pd_args
);
1589 * Try legacy Samsung-specific bindings
1590 * (for backwards compatibility of DT ABI)
1592 pd_args
.args_count
= 0;
1593 pd_args
.np
= of_parse_phandle(dev
->of_node
,
1594 "samsung,power-domain", 0);
1599 pd
= of_genpd_get_from_provider(&pd_args
);
1600 of_node_put(pd_args
.np
);
1602 dev_dbg(dev
, "%s() failed to find PM domain: %ld\n",
1603 __func__
, PTR_ERR(pd
));
1604 return -EPROBE_DEFER
;
1607 dev_dbg(dev
, "adding to PM domain %s\n", pd
->name
);
1609 for (i
= 1; i
< GENPD_RETRY_MAX_MS
; i
<<= 1) {
1610 ret
= pm_genpd_add_device(pd
, dev
);
1619 dev_err(dev
, "failed to add to PM domain %s: %d",
1624 dev
->pm_domain
->detach
= genpd_dev_pm_detach
;
1625 dev
->pm_domain
->sync
= genpd_dev_pm_sync
;
1627 mutex_lock(&pd
->lock
);
1628 ret
= genpd_poweron(pd
, 0);
1629 mutex_unlock(&pd
->lock
);
1631 return ret
? -EPROBE_DEFER
: 0;
1633 EXPORT_SYMBOL_GPL(genpd_dev_pm_attach
);
1634 #endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
1637 /*** debugfs support ***/
1639 #ifdef CONFIG_DEBUG_FS
1640 #include <linux/pm.h>
1641 #include <linux/device.h>
1642 #include <linux/debugfs.h>
1643 #include <linux/seq_file.h>
1644 #include <linux/init.h>
1645 #include <linux/kobject.h>
1646 static struct dentry
*pm_genpd_debugfs_dir
;
1649 * TODO: This function is a slightly modified version of rtpm_status_show
1650 * from sysfs.c, so generalize it.
1652 static void rtpm_status_str(struct seq_file
*s
, struct device
*dev
)
1654 static const char * const status_lookup
[] = {
1655 [RPM_ACTIVE
] = "active",
1656 [RPM_RESUMING
] = "resuming",
1657 [RPM_SUSPENDED
] = "suspended",
1658 [RPM_SUSPENDING
] = "suspending"
1662 if (dev
->power
.runtime_error
)
1664 else if (dev
->power
.disable_depth
)
1666 else if (dev
->power
.runtime_status
< ARRAY_SIZE(status_lookup
))
1667 p
= status_lookup
[dev
->power
.runtime_status
];
1674 static int pm_genpd_summary_one(struct seq_file
*s
,
1675 struct generic_pm_domain
*genpd
)
1677 static const char * const status_lookup
[] = {
1678 [GPD_STATE_ACTIVE
] = "on",
1679 [GPD_STATE_POWER_OFF
] = "off"
1681 struct pm_domain_data
*pm_data
;
1682 const char *kobj_path
;
1683 struct gpd_link
*link
;
1687 ret
= mutex_lock_interruptible(&genpd
->lock
);
1689 return -ERESTARTSYS
;
1691 if (WARN_ON(genpd
->status
>= ARRAY_SIZE(status_lookup
)))
1693 if (genpd
->status
== GPD_STATE_POWER_OFF
)
1694 snprintf(state
, sizeof(state
), "%s-%u",
1695 status_lookup
[genpd
->status
], genpd
->state_idx
);
1697 snprintf(state
, sizeof(state
), "%s",
1698 status_lookup
[genpd
->status
]);
1699 seq_printf(s
, "%-30s %-15s ", genpd
->name
, state
);
1702 * Modifications on the list require holding locks on both
1703 * master and slave, so we are safe.
1704 * Also genpd->name is immutable.
1706 list_for_each_entry(link
, &genpd
->master_links
, master_node
) {
1707 seq_printf(s
, "%s", link
->slave
->name
);
1708 if (!list_is_last(&link
->master_node
, &genpd
->master_links
))
1712 list_for_each_entry(pm_data
, &genpd
->dev_list
, list_node
) {
1713 kobj_path
= kobject_get_path(&pm_data
->dev
->kobj
, GFP_KERNEL
);
1714 if (kobj_path
== NULL
)
1717 seq_printf(s
, "\n %-50s ", kobj_path
);
1718 rtpm_status_str(s
, pm_data
->dev
);
1724 mutex_unlock(&genpd
->lock
);
1729 static int pm_genpd_summary_show(struct seq_file
*s
, void *data
)
1731 struct generic_pm_domain
*genpd
;
1734 seq_puts(s
, "domain status slaves\n");
1735 seq_puts(s
, " /device runtime status\n");
1736 seq_puts(s
, "----------------------------------------------------------------------\n");
1738 ret
= mutex_lock_interruptible(&gpd_list_lock
);
1740 return -ERESTARTSYS
;
1742 list_for_each_entry(genpd
, &gpd_list
, gpd_list_node
) {
1743 ret
= pm_genpd_summary_one(s
, genpd
);
1747 mutex_unlock(&gpd_list_lock
);
1752 static int pm_genpd_summary_open(struct inode
*inode
, struct file
*file
)
1754 return single_open(file
, pm_genpd_summary_show
, NULL
);
1757 static const struct file_operations pm_genpd_summary_fops
= {
1758 .open
= pm_genpd_summary_open
,
1760 .llseek
= seq_lseek
,
1761 .release
= single_release
,
1764 static int __init
pm_genpd_debug_init(void)
1768 pm_genpd_debugfs_dir
= debugfs_create_dir("pm_genpd", NULL
);
1770 if (!pm_genpd_debugfs_dir
)
1773 d
= debugfs_create_file("pm_genpd_summary", S_IRUGO
,
1774 pm_genpd_debugfs_dir
, NULL
, &pm_genpd_summary_fops
);
1780 late_initcall(pm_genpd_debug_init
);
1782 static void __exit
pm_genpd_debug_exit(void)
1784 debugfs_remove_recursive(pm_genpd_debugfs_dir
);
1786 __exitcall(pm_genpd_debug_exit
);
1787 #endif /* CONFIG_DEBUG_FS */