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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * drivers/base/power/domain.c - Common code related to device power domains.
4 *
5 * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
6 */
7#define pr_fmt(fmt) "PM: " fmt
8
9#include <linux/delay.h>
10#include <linux/kernel.h>
11#include <linux/io.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>
23#include <linux/cpu.h>
24
25#include "power.h"
26
27#define GENPD_RETRY_MAX_MS 250 /* Approximate */
28
29#define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \
30({ \
31 type (*__routine)(struct device *__d); \
32 type __ret = (type)0; \
33 \
34 __routine = genpd->dev_ops.callback; \
35 if (__routine) { \
36 __ret = __routine(dev); \
37 } \
38 __ret; \
39})
40
41static LIST_HEAD(gpd_list);
42static DEFINE_MUTEX(gpd_list_lock);
43
44struct genpd_lock_ops {
45 void (*lock)(struct generic_pm_domain *genpd);
46 void (*lock_nested)(struct generic_pm_domain *genpd, int depth);
47 int (*lock_interruptible)(struct generic_pm_domain *genpd);
48 void (*unlock)(struct generic_pm_domain *genpd);
49};
50
51static void genpd_lock_mtx(struct generic_pm_domain *genpd)
52{
53 mutex_lock(&genpd->mlock);
54}
55
56static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd,
57 int depth)
58{
59 mutex_lock_nested(&genpd->mlock, depth);
60}
61
62static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd)
63{
64 return mutex_lock_interruptible(&genpd->mlock);
65}
66
67static void genpd_unlock_mtx(struct generic_pm_domain *genpd)
68{
69 return mutex_unlock(&genpd->mlock);
70}
71
72static const struct genpd_lock_ops genpd_mtx_ops = {
73 .lock = genpd_lock_mtx,
74 .lock_nested = genpd_lock_nested_mtx,
75 .lock_interruptible = genpd_lock_interruptible_mtx,
76 .unlock = genpd_unlock_mtx,
77};
78
79static void genpd_lock_spin(struct generic_pm_domain *genpd)
80 __acquires(&genpd->slock)
81{
82 unsigned long flags;
83
84 spin_lock_irqsave(&genpd->slock, flags);
85 genpd->lock_flags = flags;
86}
87
88static void genpd_lock_nested_spin(struct generic_pm_domain *genpd,
89 int depth)
90 __acquires(&genpd->slock)
91{
92 unsigned long flags;
93
94 spin_lock_irqsave_nested(&genpd->slock, flags, depth);
95 genpd->lock_flags = flags;
96}
97
98static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd)
99 __acquires(&genpd->slock)
100{
101 unsigned long flags;
102
103 spin_lock_irqsave(&genpd->slock, flags);
104 genpd->lock_flags = flags;
105 return 0;
106}
107
108static void genpd_unlock_spin(struct generic_pm_domain *genpd)
109 __releases(&genpd->slock)
110{
111 spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags);
112}
113
114static const struct genpd_lock_ops genpd_spin_ops = {
115 .lock = genpd_lock_spin,
116 .lock_nested = genpd_lock_nested_spin,
117 .lock_interruptible = genpd_lock_interruptible_spin,
118 .unlock = genpd_unlock_spin,
119};
120
121#define genpd_lock(p) p->lock_ops->lock(p)
122#define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d)
123#define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p)
124#define genpd_unlock(p) p->lock_ops->unlock(p)
125
126#define genpd_status_on(genpd) (genpd->status == GPD_STATE_ACTIVE)
127#define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE)
128#define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON)
129#define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP)
130#define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN)
131#define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON)
132
133static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev,
134 const struct generic_pm_domain *genpd)
135{
136 bool ret;
137
138 ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd);
139
140 /*
141 * Warn once if an IRQ safe device is attached to a no sleep domain, as
142 * to indicate a suboptimal configuration for PM. For an always on
143 * domain this isn't case, thus don't warn.
144 */
145 if (ret && !genpd_is_always_on(genpd))
146 dev_warn_once(dev, "PM domain %s will not be powered off\n",
147 genpd->name);
148
149 return ret;
150}
151
152static int genpd_runtime_suspend(struct device *dev);
153
154/*
155 * Get the generic PM domain for a particular struct device.
156 * This validates the struct device pointer, the PM domain pointer,
157 * and checks that the PM domain pointer is a real generic PM domain.
158 * Any failure results in NULL being returned.
159 */
160static struct generic_pm_domain *dev_to_genpd_safe(struct device *dev)
161{
162 if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain))
163 return NULL;
164
165 /* A genpd's always have its ->runtime_suspend() callback assigned. */
166 if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend)
167 return pd_to_genpd(dev->pm_domain);
168
169 return NULL;
170}
171
172/*
173 * This should only be used where we are certain that the pm_domain
174 * attached to the device is a genpd domain.
175 */
176static struct generic_pm_domain *dev_to_genpd(struct device *dev)
177{
178 if (IS_ERR_OR_NULL(dev->pm_domain))
179 return ERR_PTR(-EINVAL);
180
181 return pd_to_genpd(dev->pm_domain);
182}
183
184static int genpd_stop_dev(const struct generic_pm_domain *genpd,
185 struct device *dev)
186{
187 return GENPD_DEV_CALLBACK(genpd, int, stop, dev);
188}
189
190static int genpd_start_dev(const struct generic_pm_domain *genpd,
191 struct device *dev)
192{
193 return GENPD_DEV_CALLBACK(genpd, int, start, dev);
194}
195
196static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
197{
198 bool ret = false;
199
200 if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
201 ret = !!atomic_dec_and_test(&genpd->sd_count);
202
203 return ret;
204}
205
206static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
207{
208 atomic_inc(&genpd->sd_count);
209 smp_mb__after_atomic();
210}
211
212#ifdef CONFIG_DEBUG_FS
213static void genpd_update_accounting(struct generic_pm_domain *genpd)
214{
215 ktime_t delta, now;
216
217 now = ktime_get();
218 delta = ktime_sub(now, genpd->accounting_time);
219
220 /*
221 * If genpd->status is active, it means we are just
222 * out of off and so update the idle time and vice
223 * versa.
224 */
225 if (genpd->status == GPD_STATE_ACTIVE) {
226 int state_idx = genpd->state_idx;
227
228 genpd->states[state_idx].idle_time =
229 ktime_add(genpd->states[state_idx].idle_time, delta);
230 } else {
231 genpd->on_time = ktime_add(genpd->on_time, delta);
232 }
233
234 genpd->accounting_time = now;
235}
236#else
237static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {}
238#endif
239
240static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd,
241 unsigned int state)
242{
243 struct generic_pm_domain_data *pd_data;
244 struct pm_domain_data *pdd;
245 struct gpd_link *link;
246
247 /* New requested state is same as Max requested state */
248 if (state == genpd->performance_state)
249 return state;
250
251 /* New requested state is higher than Max requested state */
252 if (state > genpd->performance_state)
253 return state;
254
255 /* Traverse all devices within the domain */
256 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
257 pd_data = to_gpd_data(pdd);
258
259 if (pd_data->performance_state > state)
260 state = pd_data->performance_state;
261 }
262
263 /*
264 * Traverse all sub-domains within the domain. This can be
265 * done without any additional locking as the link->performance_state
266 * field is protected by the parent genpd->lock, which is already taken.
267 *
268 * Also note that link->performance_state (subdomain's performance state
269 * requirement to parent domain) is different from
270 * link->child->performance_state (current performance state requirement
271 * of the devices/sub-domains of the subdomain) and so can have a
272 * different value.
273 *
274 * Note that we also take vote from powered-off sub-domains into account
275 * as the same is done for devices right now.
276 */
277 list_for_each_entry(link, &genpd->parent_links, parent_node) {
278 if (link->performance_state > state)
279 state = link->performance_state;
280 }
281
282 return state;
283}
284
285static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
286 unsigned int state, int depth)
287{
288 struct generic_pm_domain *parent;
289 struct gpd_link *link;
290 int parent_state, ret;
291
292 if (state == genpd->performance_state)
293 return 0;
294
295 /* Propagate to parents of genpd */
296 list_for_each_entry(link, &genpd->child_links, child_node) {
297 parent = link->parent;
298
299 if (!parent->set_performance_state)
300 continue;
301
302 /* Find parent's performance state */
303 ret = dev_pm_opp_xlate_performance_state(genpd->opp_table,
304 parent->opp_table,
305 state);
306 if (unlikely(ret < 0))
307 goto err;
308
309 parent_state = ret;
310
311 genpd_lock_nested(parent, depth + 1);
312
313 link->prev_performance_state = link->performance_state;
314 link->performance_state = parent_state;
315 parent_state = _genpd_reeval_performance_state(parent,
316 parent_state);
317 ret = _genpd_set_performance_state(parent, parent_state, depth + 1);
318 if (ret)
319 link->performance_state = link->prev_performance_state;
320
321 genpd_unlock(parent);
322
323 if (ret)
324 goto err;
325 }
326
327 ret = genpd->set_performance_state(genpd, state);
328 if (ret)
329 goto err;
330
331 genpd->performance_state = state;
332 return 0;
333
334err:
335 /* Encountered an error, lets rollback */
336 list_for_each_entry_continue_reverse(link, &genpd->child_links,
337 child_node) {
338 parent = link->parent;
339
340 if (!parent->set_performance_state)
341 continue;
342
343 genpd_lock_nested(parent, depth + 1);
344
345 parent_state = link->prev_performance_state;
346 link->performance_state = parent_state;
347
348 parent_state = _genpd_reeval_performance_state(parent,
349 parent_state);
350 if (_genpd_set_performance_state(parent, parent_state, depth + 1)) {
351 pr_err("%s: Failed to roll back to %d performance state\n",
352 parent->name, parent_state);
353 }
354
355 genpd_unlock(parent);
356 }
357
358 return ret;
359}
360
361/**
362 * dev_pm_genpd_set_performance_state- Set performance state of device's power
363 * domain.
364 *
365 * @dev: Device for which the performance-state needs to be set.
366 * @state: Target performance state of the device. This can be set as 0 when the
367 * device doesn't have any performance state constraints left (And so
368 * the device wouldn't participate anymore to find the target
369 * performance state of the genpd).
370 *
371 * It is assumed that the users guarantee that the genpd wouldn't be detached
372 * while this routine is getting called.
373 *
374 * Returns 0 on success and negative error values on failures.
375 */
376int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
377{
378 struct generic_pm_domain *genpd;
379 struct generic_pm_domain_data *gpd_data;
380 unsigned int prev;
381 int ret;
382
383 genpd = dev_to_genpd_safe(dev);
384 if (!genpd)
385 return -ENODEV;
386
387 if (unlikely(!genpd->set_performance_state))
388 return -EINVAL;
389
390 if (WARN_ON(!dev->power.subsys_data ||
391 !dev->power.subsys_data->domain_data))
392 return -EINVAL;
393
394 genpd_lock(genpd);
395
396 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
397 prev = gpd_data->performance_state;
398 gpd_data->performance_state = state;
399
400 state = _genpd_reeval_performance_state(genpd, state);
401 ret = _genpd_set_performance_state(genpd, state, 0);
402 if (ret)
403 gpd_data->performance_state = prev;
404
405 genpd_unlock(genpd);
406
407 return ret;
408}
409EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state);
410
411static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
412{
413 unsigned int state_idx = genpd->state_idx;
414 ktime_t time_start;
415 s64 elapsed_ns;
416 int ret;
417
418 if (!genpd->power_on)
419 return 0;
420
421 if (!timed)
422 return genpd->power_on(genpd);
423
424 time_start = ktime_get();
425 ret = genpd->power_on(genpd);
426 if (ret)
427 return ret;
428
429 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
430 if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns)
431 return ret;
432
433 genpd->states[state_idx].power_on_latency_ns = elapsed_ns;
434 genpd->max_off_time_changed = true;
435 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
436 genpd->name, "on", elapsed_ns);
437
438 return ret;
439}
440
441static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed)
442{
443 unsigned int state_idx = genpd->state_idx;
444 ktime_t time_start;
445 s64 elapsed_ns;
446 int ret;
447
448 if (!genpd->power_off)
449 return 0;
450
451 if (!timed)
452 return genpd->power_off(genpd);
453
454 time_start = ktime_get();
455 ret = genpd->power_off(genpd);
456 if (ret)
457 return ret;
458
459 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
460 if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns)
461 return 0;
462
463 genpd->states[state_idx].power_off_latency_ns = elapsed_ns;
464 genpd->max_off_time_changed = true;
465 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
466 genpd->name, "off", elapsed_ns);
467
468 return 0;
469}
470
471/**
472 * genpd_queue_power_off_work - Queue up the execution of genpd_power_off().
473 * @genpd: PM domain to power off.
474 *
475 * Queue up the execution of genpd_power_off() unless it's already been done
476 * before.
477 */
478static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
479{
480 queue_work(pm_wq, &genpd->power_off_work);
481}
482
483/**
484 * genpd_power_off - Remove power from a given PM domain.
485 * @genpd: PM domain to power down.
486 * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the
487 * RPM status of the releated device is in an intermediate state, not yet turned
488 * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not
489 * be RPM_SUSPENDED, while it tries to power off the PM domain.
490 *
491 * If all of the @genpd's devices have been suspended and all of its subdomains
492 * have been powered down, remove power from @genpd.
493 */
494static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
495 unsigned int depth)
496{
497 struct pm_domain_data *pdd;
498 struct gpd_link *link;
499 unsigned int not_suspended = 0;
500
501 /*
502 * Do not try to power off the domain in the following situations:
503 * (1) The domain is already in the "power off" state.
504 * (2) System suspend is in progress.
505 */
506 if (!genpd_status_on(genpd) || genpd->prepared_count > 0)
507 return 0;
508
509 /*
510 * Abort power off for the PM domain in the following situations:
511 * (1) The domain is configured as always on.
512 * (2) When the domain has a subdomain being powered on.
513 */
514 if (genpd_is_always_on(genpd) ||
515 genpd_is_rpm_always_on(genpd) ||
516 atomic_read(&genpd->sd_count) > 0)
517 return -EBUSY;
518
519 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
520 enum pm_qos_flags_status stat;
521
522 stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF);
523 if (stat > PM_QOS_FLAGS_NONE)
524 return -EBUSY;
525
526 /*
527 * Do not allow PM domain to be powered off, when an IRQ safe
528 * device is part of a non-IRQ safe domain.
529 */
530 if (!pm_runtime_suspended(pdd->dev) ||
531 irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd))
532 not_suspended++;
533 }
534
535 if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on))
536 return -EBUSY;
537
538 if (genpd->gov && genpd->gov->power_down_ok) {
539 if (!genpd->gov->power_down_ok(&genpd->domain))
540 return -EAGAIN;
541 }
542
543 /* Default to shallowest state. */
544 if (!genpd->gov)
545 genpd->state_idx = 0;
546
547 if (genpd->power_off) {
548 int ret;
549
550 if (atomic_read(&genpd->sd_count) > 0)
551 return -EBUSY;
552
553 /*
554 * If sd_count > 0 at this point, one of the subdomains hasn't
555 * managed to call genpd_power_on() for the parent yet after
556 * incrementing it. In that case genpd_power_on() will wait
557 * for us to drop the lock, so we can call .power_off() and let
558 * the genpd_power_on() restore power for us (this shouldn't
559 * happen very often).
560 */
561 ret = _genpd_power_off(genpd, true);
562 if (ret)
563 return ret;
564 }
565
566 genpd->status = GPD_STATE_POWER_OFF;
567 genpd_update_accounting(genpd);
568
569 list_for_each_entry(link, &genpd->child_links, child_node) {
570 genpd_sd_counter_dec(link->parent);
571 genpd_lock_nested(link->parent, depth + 1);
572 genpd_power_off(link->parent, false, depth + 1);
573 genpd_unlock(link->parent);
574 }
575
576 return 0;
577}
578
579/**
580 * genpd_power_on - Restore power to a given PM domain and its parents.
581 * @genpd: PM domain to power up.
582 * @depth: nesting count for lockdep.
583 *
584 * Restore power to @genpd and all of its parents so that it is possible to
585 * resume a device belonging to it.
586 */
587static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth)
588{
589 struct gpd_link *link;
590 int ret = 0;
591
592 if (genpd_status_on(genpd))
593 return 0;
594
595 /*
596 * The list is guaranteed not to change while the loop below is being
597 * executed, unless one of the parents' .power_on() callbacks fiddles
598 * with it.
599 */
600 list_for_each_entry(link, &genpd->child_links, child_node) {
601 struct generic_pm_domain *parent = link->parent;
602
603 genpd_sd_counter_inc(parent);
604
605 genpd_lock_nested(parent, depth + 1);
606 ret = genpd_power_on(parent, depth + 1);
607 genpd_unlock(parent);
608
609 if (ret) {
610 genpd_sd_counter_dec(parent);
611 goto err;
612 }
613 }
614
615 ret = _genpd_power_on(genpd, true);
616 if (ret)
617 goto err;
618
619 genpd->status = GPD_STATE_ACTIVE;
620 genpd_update_accounting(genpd);
621
622 return 0;
623
624 err:
625 list_for_each_entry_continue_reverse(link,
626 &genpd->child_links,
627 child_node) {
628 genpd_sd_counter_dec(link->parent);
629 genpd_lock_nested(link->parent, depth + 1);
630 genpd_power_off(link->parent, false, depth + 1);
631 genpd_unlock(link->parent);
632 }
633
634 return ret;
635}
636
637static int genpd_dev_pm_start(struct device *dev)
638{
639 struct generic_pm_domain *genpd = dev_to_genpd(dev);
640
641 return genpd_start_dev(genpd, dev);
642}
643
644static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
645 unsigned long val, void *ptr)
646{
647 struct generic_pm_domain_data *gpd_data;
648 struct device *dev;
649
650 gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
651 dev = gpd_data->base.dev;
652
653 for (;;) {
654 struct generic_pm_domain *genpd;
655 struct pm_domain_data *pdd;
656
657 spin_lock_irq(&dev->power.lock);
658
659 pdd = dev->power.subsys_data ?
660 dev->power.subsys_data->domain_data : NULL;
661 if (pdd) {
662 to_gpd_data(pdd)->td.constraint_changed = true;
663 genpd = dev_to_genpd(dev);
664 } else {
665 genpd = ERR_PTR(-ENODATA);
666 }
667
668 spin_unlock_irq(&dev->power.lock);
669
670 if (!IS_ERR(genpd)) {
671 genpd_lock(genpd);
672 genpd->max_off_time_changed = true;
673 genpd_unlock(genpd);
674 }
675
676 dev = dev->parent;
677 if (!dev || dev->power.ignore_children)
678 break;
679 }
680
681 return NOTIFY_DONE;
682}
683
684/**
685 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
686 * @work: Work structure used for scheduling the execution of this function.
687 */
688static void genpd_power_off_work_fn(struct work_struct *work)
689{
690 struct generic_pm_domain *genpd;
691
692 genpd = container_of(work, struct generic_pm_domain, power_off_work);
693
694 genpd_lock(genpd);
695 genpd_power_off(genpd, false, 0);
696 genpd_unlock(genpd);
697}
698
699/**
700 * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks
701 * @dev: Device to handle.
702 */
703static int __genpd_runtime_suspend(struct device *dev)
704{
705 int (*cb)(struct device *__dev);
706
707 if (dev->type && dev->type->pm)
708 cb = dev->type->pm->runtime_suspend;
709 else if (dev->class && dev->class->pm)
710 cb = dev->class->pm->runtime_suspend;
711 else if (dev->bus && dev->bus->pm)
712 cb = dev->bus->pm->runtime_suspend;
713 else
714 cb = NULL;
715
716 if (!cb && dev->driver && dev->driver->pm)
717 cb = dev->driver->pm->runtime_suspend;
718
719 return cb ? cb(dev) : 0;
720}
721
722/**
723 * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks
724 * @dev: Device to handle.
725 */
726static int __genpd_runtime_resume(struct device *dev)
727{
728 int (*cb)(struct device *__dev);
729
730 if (dev->type && dev->type->pm)
731 cb = dev->type->pm->runtime_resume;
732 else if (dev->class && dev->class->pm)
733 cb = dev->class->pm->runtime_resume;
734 else if (dev->bus && dev->bus->pm)
735 cb = dev->bus->pm->runtime_resume;
736 else
737 cb = NULL;
738
739 if (!cb && dev->driver && dev->driver->pm)
740 cb = dev->driver->pm->runtime_resume;
741
742 return cb ? cb(dev) : 0;
743}
744
745/**
746 * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
747 * @dev: Device to suspend.
748 *
749 * Carry out a runtime suspend of a device under the assumption that its
750 * pm_domain field points to the domain member of an object of type
751 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
752 */
753static int genpd_runtime_suspend(struct device *dev)
754{
755 struct generic_pm_domain *genpd;
756 bool (*suspend_ok)(struct device *__dev);
757 struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
758 bool runtime_pm = pm_runtime_enabled(dev);
759 ktime_t time_start;
760 s64 elapsed_ns;
761 int ret;
762
763 dev_dbg(dev, "%s()\n", __func__);
764
765 genpd = dev_to_genpd(dev);
766 if (IS_ERR(genpd))
767 return -EINVAL;
768
769 /*
770 * A runtime PM centric subsystem/driver may re-use the runtime PM
771 * callbacks for other purposes than runtime PM. In those scenarios
772 * runtime PM is disabled. Under these circumstances, we shall skip
773 * validating/measuring the PM QoS latency.
774 */
775 suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL;
776 if (runtime_pm && suspend_ok && !suspend_ok(dev))
777 return -EBUSY;
778
779 /* Measure suspend latency. */
780 time_start = 0;
781 if (runtime_pm)
782 time_start = ktime_get();
783
784 ret = __genpd_runtime_suspend(dev);
785 if (ret)
786 return ret;
787
788 ret = genpd_stop_dev(genpd, dev);
789 if (ret) {
790 __genpd_runtime_resume(dev);
791 return ret;
792 }
793
794 /* Update suspend latency value if the measured time exceeds it. */
795 if (runtime_pm) {
796 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
797 if (elapsed_ns > td->suspend_latency_ns) {
798 td->suspend_latency_ns = elapsed_ns;
799 dev_dbg(dev, "suspend latency exceeded, %lld ns\n",
800 elapsed_ns);
801 genpd->max_off_time_changed = true;
802 td->constraint_changed = true;
803 }
804 }
805
806 /*
807 * If power.irq_safe is set, this routine may be run with
808 * IRQs disabled, so suspend only if the PM domain also is irq_safe.
809 */
810 if (irq_safe_dev_in_no_sleep_domain(dev, genpd))
811 return 0;
812
813 genpd_lock(genpd);
814 genpd_power_off(genpd, true, 0);
815 genpd_unlock(genpd);
816
817 return 0;
818}
819
820/**
821 * genpd_runtime_resume - Resume a device belonging to I/O PM domain.
822 * @dev: Device to resume.
823 *
824 * Carry out a runtime resume of a device under the assumption that its
825 * pm_domain field points to the domain member of an object of type
826 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
827 */
828static int genpd_runtime_resume(struct device *dev)
829{
830 struct generic_pm_domain *genpd;
831 struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
832 bool runtime_pm = pm_runtime_enabled(dev);
833 ktime_t time_start;
834 s64 elapsed_ns;
835 int ret;
836 bool timed = true;
837
838 dev_dbg(dev, "%s()\n", __func__);
839
840 genpd = dev_to_genpd(dev);
841 if (IS_ERR(genpd))
842 return -EINVAL;
843
844 /*
845 * As we don't power off a non IRQ safe domain, which holds
846 * an IRQ safe device, we don't need to restore power to it.
847 */
848 if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) {
849 timed = false;
850 goto out;
851 }
852
853 genpd_lock(genpd);
854 ret = genpd_power_on(genpd, 0);
855 genpd_unlock(genpd);
856
857 if (ret)
858 return ret;
859
860 out:
861 /* Measure resume latency. */
862 time_start = 0;
863 if (timed && runtime_pm)
864 time_start = ktime_get();
865
866 ret = genpd_start_dev(genpd, dev);
867 if (ret)
868 goto err_poweroff;
869
870 ret = __genpd_runtime_resume(dev);
871 if (ret)
872 goto err_stop;
873
874 /* Update resume latency value if the measured time exceeds it. */
875 if (timed && runtime_pm) {
876 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
877 if (elapsed_ns > td->resume_latency_ns) {
878 td->resume_latency_ns = elapsed_ns;
879 dev_dbg(dev, "resume latency exceeded, %lld ns\n",
880 elapsed_ns);
881 genpd->max_off_time_changed = true;
882 td->constraint_changed = true;
883 }
884 }
885
886 return 0;
887
888err_stop:
889 genpd_stop_dev(genpd, dev);
890err_poweroff:
891 if (!pm_runtime_is_irq_safe(dev) ||
892 (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) {
893 genpd_lock(genpd);
894 genpd_power_off(genpd, true, 0);
895 genpd_unlock(genpd);
896 }
897
898 return ret;
899}
900
901static bool pd_ignore_unused;
902static int __init pd_ignore_unused_setup(char *__unused)
903{
904 pd_ignore_unused = true;
905 return 1;
906}
907__setup("pd_ignore_unused", pd_ignore_unused_setup);
908
909/**
910 * genpd_power_off_unused - Power off all PM domains with no devices in use.
911 */
912static int __init genpd_power_off_unused(void)
913{
914 struct generic_pm_domain *genpd;
915
916 if (pd_ignore_unused) {
917 pr_warn("genpd: Not disabling unused power domains\n");
918 return 0;
919 }
920
921 mutex_lock(&gpd_list_lock);
922
923 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
924 genpd_queue_power_off_work(genpd);
925
926 mutex_unlock(&gpd_list_lock);
927
928 return 0;
929}
930late_initcall(genpd_power_off_unused);
931
932#ifdef CONFIG_PM_SLEEP
933
934/**
935 * genpd_sync_power_off - Synchronously power off a PM domain and its parents.
936 * @genpd: PM domain to power off, if possible.
937 * @use_lock: use the lock.
938 * @depth: nesting count for lockdep.
939 *
940 * Check if the given PM domain can be powered off (during system suspend or
941 * hibernation) and do that if so. Also, in that case propagate to its parents.
942 *
943 * This function is only called in "noirq" and "syscore" stages of system power
944 * transitions. The "noirq" callbacks may be executed asynchronously, thus in
945 * these cases the lock must be held.
946 */
947static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock,
948 unsigned int depth)
949{
950 struct gpd_link *link;
951
952 if (!genpd_status_on(genpd) || genpd_is_always_on(genpd))
953 return;
954
955 if (genpd->suspended_count != genpd->device_count
956 || atomic_read(&genpd->sd_count) > 0)
957 return;
958
959 /* Choose the deepest state when suspending */
960 genpd->state_idx = genpd->state_count - 1;
961 if (_genpd_power_off(genpd, false))
962 return;
963
964 genpd->status = GPD_STATE_POWER_OFF;
965
966 list_for_each_entry(link, &genpd->child_links, child_node) {
967 genpd_sd_counter_dec(link->parent);
968
969 if (use_lock)
970 genpd_lock_nested(link->parent, depth + 1);
971
972 genpd_sync_power_off(link->parent, use_lock, depth + 1);
973
974 if (use_lock)
975 genpd_unlock(link->parent);
976 }
977}
978
979/**
980 * genpd_sync_power_on - Synchronously power on a PM domain and its parents.
981 * @genpd: PM domain to power on.
982 * @use_lock: use the lock.
983 * @depth: nesting count for lockdep.
984 *
985 * This function is only called in "noirq" and "syscore" stages of system power
986 * transitions. The "noirq" callbacks may be executed asynchronously, thus in
987 * these cases the lock must be held.
988 */
989static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock,
990 unsigned int depth)
991{
992 struct gpd_link *link;
993
994 if (genpd_status_on(genpd))
995 return;
996
997 list_for_each_entry(link, &genpd->child_links, child_node) {
998 genpd_sd_counter_inc(link->parent);
999
1000 if (use_lock)
1001 genpd_lock_nested(link->parent, depth + 1);
1002
1003 genpd_sync_power_on(link->parent, use_lock, depth + 1);
1004
1005 if (use_lock)
1006 genpd_unlock(link->parent);
1007 }
1008
1009 _genpd_power_on(genpd, false);
1010
1011 genpd->status = GPD_STATE_ACTIVE;
1012}
1013
1014/**
1015 * resume_needed - Check whether to resume a device before system suspend.
1016 * @dev: Device to check.
1017 * @genpd: PM domain the device belongs to.
1018 *
1019 * There are two cases in which a device that can wake up the system from sleep
1020 * states should be resumed by genpd_prepare(): (1) if the device is enabled
1021 * to wake up the system and it has to remain active for this purpose while the
1022 * system is in the sleep state and (2) if the device is not enabled to wake up
1023 * the system from sleep states and it generally doesn't generate wakeup signals
1024 * by itself (those signals are generated on its behalf by other parts of the
1025 * system). In the latter case it may be necessary to reconfigure the device's
1026 * wakeup settings during system suspend, because it may have been set up to
1027 * signal remote wakeup from the system's working state as needed by runtime PM.
1028 * Return 'true' in either of the above cases.
1029 */
1030static bool resume_needed(struct device *dev,
1031 const struct generic_pm_domain *genpd)
1032{
1033 bool active_wakeup;
1034
1035 if (!device_can_wakeup(dev))
1036 return false;
1037
1038 active_wakeup = genpd_is_active_wakeup(genpd);
1039 return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
1040}
1041
1042/**
1043 * genpd_prepare - Start power transition of a device in a PM domain.
1044 * @dev: Device to start the transition of.
1045 *
1046 * Start a power transition of a device (during a system-wide power transition)
1047 * under the assumption that its pm_domain field points to the domain member of
1048 * an object of type struct generic_pm_domain representing a PM domain
1049 * consisting of I/O devices.
1050 */
1051static int genpd_prepare(struct device *dev)
1052{
1053 struct generic_pm_domain *genpd;
1054 int ret;
1055
1056 dev_dbg(dev, "%s()\n", __func__);
1057
1058 genpd = dev_to_genpd(dev);
1059 if (IS_ERR(genpd))
1060 return -EINVAL;
1061
1062 /*
1063 * If a wakeup request is pending for the device, it should be woken up
1064 * at this point and a system wakeup event should be reported if it's
1065 * set up to wake up the system from sleep states.
1066 */
1067 if (resume_needed(dev, genpd))
1068 pm_runtime_resume(dev);
1069
1070 genpd_lock(genpd);
1071
1072 if (genpd->prepared_count++ == 0)
1073 genpd->suspended_count = 0;
1074
1075 genpd_unlock(genpd);
1076
1077 ret = pm_generic_prepare(dev);
1078 if (ret < 0) {
1079 genpd_lock(genpd);
1080
1081 genpd->prepared_count--;
1082
1083 genpd_unlock(genpd);
1084 }
1085
1086 /* Never return 1, as genpd don't cope with the direct_complete path. */
1087 return ret >= 0 ? 0 : ret;
1088}
1089
1090/**
1091 * genpd_finish_suspend - Completion of suspend or hibernation of device in an
1092 * I/O pm domain.
1093 * @dev: Device to suspend.
1094 * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback.
1095 *
1096 * Stop the device and remove power from the domain if all devices in it have
1097 * been stopped.
1098 */
1099static int genpd_finish_suspend(struct device *dev, bool poweroff)
1100{
1101 struct generic_pm_domain *genpd;
1102 int ret = 0;
1103
1104 genpd = dev_to_genpd(dev);
1105 if (IS_ERR(genpd))
1106 return -EINVAL;
1107
1108 if (poweroff)
1109 ret = pm_generic_poweroff_noirq(dev);
1110 else
1111 ret = pm_generic_suspend_noirq(dev);
1112 if (ret)
1113 return ret;
1114
1115 if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd))
1116 return 0;
1117
1118 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1119 !pm_runtime_status_suspended(dev)) {
1120 ret = genpd_stop_dev(genpd, dev);
1121 if (ret) {
1122 if (poweroff)
1123 pm_generic_restore_noirq(dev);
1124 else
1125 pm_generic_resume_noirq(dev);
1126 return ret;
1127 }
1128 }
1129
1130 genpd_lock(genpd);
1131 genpd->suspended_count++;
1132 genpd_sync_power_off(genpd, true, 0);
1133 genpd_unlock(genpd);
1134
1135 return 0;
1136}
1137
1138/**
1139 * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
1140 * @dev: Device to suspend.
1141 *
1142 * Stop the device and remove power from the domain if all devices in it have
1143 * been stopped.
1144 */
1145static int genpd_suspend_noirq(struct device *dev)
1146{
1147 dev_dbg(dev, "%s()\n", __func__);
1148
1149 return genpd_finish_suspend(dev, false);
1150}
1151
1152/**
1153 * genpd_resume_noirq - Start of resume of device in an I/O PM domain.
1154 * @dev: Device to resume.
1155 *
1156 * Restore power to the device's PM domain, if necessary, and start the device.
1157 */
1158static int genpd_resume_noirq(struct device *dev)
1159{
1160 struct generic_pm_domain *genpd;
1161 int ret;
1162
1163 dev_dbg(dev, "%s()\n", __func__);
1164
1165 genpd = dev_to_genpd(dev);
1166 if (IS_ERR(genpd))
1167 return -EINVAL;
1168
1169 if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd))
1170 return pm_generic_resume_noirq(dev);
1171
1172 genpd_lock(genpd);
1173 genpd_sync_power_on(genpd, true, 0);
1174 genpd->suspended_count--;
1175 genpd_unlock(genpd);
1176
1177 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1178 !pm_runtime_status_suspended(dev)) {
1179 ret = genpd_start_dev(genpd, dev);
1180 if (ret)
1181 return ret;
1182 }
1183
1184 return pm_generic_resume_noirq(dev);
1185}
1186
1187/**
1188 * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
1189 * @dev: Device to freeze.
1190 *
1191 * Carry out a late freeze of a device under the assumption that its
1192 * pm_domain field points to the domain member of an object of type
1193 * struct generic_pm_domain representing a power domain consisting of I/O
1194 * devices.
1195 */
1196static int genpd_freeze_noirq(struct device *dev)
1197{
1198 const struct generic_pm_domain *genpd;
1199 int ret = 0;
1200
1201 dev_dbg(dev, "%s()\n", __func__);
1202
1203 genpd = dev_to_genpd(dev);
1204 if (IS_ERR(genpd))
1205 return -EINVAL;
1206
1207 ret = pm_generic_freeze_noirq(dev);
1208 if (ret)
1209 return ret;
1210
1211 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1212 !pm_runtime_status_suspended(dev))
1213 ret = genpd_stop_dev(genpd, dev);
1214
1215 return ret;
1216}
1217
1218/**
1219 * genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
1220 * @dev: Device to thaw.
1221 *
1222 * Start the device, unless power has been removed from the domain already
1223 * before the system transition.
1224 */
1225static int genpd_thaw_noirq(struct device *dev)
1226{
1227 const struct generic_pm_domain *genpd;
1228 int ret = 0;
1229
1230 dev_dbg(dev, "%s()\n", __func__);
1231
1232 genpd = dev_to_genpd(dev);
1233 if (IS_ERR(genpd))
1234 return -EINVAL;
1235
1236 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1237 !pm_runtime_status_suspended(dev)) {
1238 ret = genpd_start_dev(genpd, dev);
1239 if (ret)
1240 return ret;
1241 }
1242
1243 return pm_generic_thaw_noirq(dev);
1244}
1245
1246/**
1247 * genpd_poweroff_noirq - Completion of hibernation of device in an
1248 * I/O PM domain.
1249 * @dev: Device to poweroff.
1250 *
1251 * Stop the device and remove power from the domain if all devices in it have
1252 * been stopped.
1253 */
1254static int genpd_poweroff_noirq(struct device *dev)
1255{
1256 dev_dbg(dev, "%s()\n", __func__);
1257
1258 return genpd_finish_suspend(dev, true);
1259}
1260
1261/**
1262 * genpd_restore_noirq - Start of restore of device in an I/O PM domain.
1263 * @dev: Device to resume.
1264 *
1265 * Make sure the domain will be in the same power state as before the
1266 * hibernation the system is resuming from and start the device if necessary.
1267 */
1268static int genpd_restore_noirq(struct device *dev)
1269{
1270 struct generic_pm_domain *genpd;
1271 int ret = 0;
1272
1273 dev_dbg(dev, "%s()\n", __func__);
1274
1275 genpd = dev_to_genpd(dev);
1276 if (IS_ERR(genpd))
1277 return -EINVAL;
1278
1279 /*
1280 * At this point suspended_count == 0 means we are being run for the
1281 * first time for the given domain in the present cycle.
1282 */
1283 genpd_lock(genpd);
1284 if (genpd->suspended_count++ == 0)
1285 /*
1286 * The boot kernel might put the domain into arbitrary state,
1287 * so make it appear as powered off to genpd_sync_power_on(),
1288 * so that it tries to power it on in case it was really off.
1289 */
1290 genpd->status = GPD_STATE_POWER_OFF;
1291
1292 genpd_sync_power_on(genpd, true, 0);
1293 genpd_unlock(genpd);
1294
1295 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1296 !pm_runtime_status_suspended(dev)) {
1297 ret = genpd_start_dev(genpd, dev);
1298 if (ret)
1299 return ret;
1300 }
1301
1302 return pm_generic_restore_noirq(dev);
1303}
1304
1305/**
1306 * genpd_complete - Complete power transition of a device in a power domain.
1307 * @dev: Device to complete the transition of.
1308 *
1309 * Complete a power transition of a device (during a system-wide power
1310 * transition) under the assumption that its pm_domain field points to the
1311 * domain member of an object of type struct generic_pm_domain representing
1312 * a power domain consisting of I/O devices.
1313 */
1314static void genpd_complete(struct device *dev)
1315{
1316 struct generic_pm_domain *genpd;
1317
1318 dev_dbg(dev, "%s()\n", __func__);
1319
1320 genpd = dev_to_genpd(dev);
1321 if (IS_ERR(genpd))
1322 return;
1323
1324 pm_generic_complete(dev);
1325
1326 genpd_lock(genpd);
1327
1328 genpd->prepared_count--;
1329 if (!genpd->prepared_count)
1330 genpd_queue_power_off_work(genpd);
1331
1332 genpd_unlock(genpd);
1333}
1334
1335/**
1336 * genpd_syscore_switch - Switch power during system core suspend or resume.
1337 * @dev: Device that normally is marked as "always on" to switch power for.
1338 *
1339 * This routine may only be called during the system core (syscore) suspend or
1340 * resume phase for devices whose "always on" flags are set.
1341 */
1342static void genpd_syscore_switch(struct device *dev, bool suspend)
1343{
1344 struct generic_pm_domain *genpd;
1345
1346 genpd = dev_to_genpd_safe(dev);
1347 if (!genpd)
1348 return;
1349
1350 if (suspend) {
1351 genpd->suspended_count++;
1352 genpd_sync_power_off(genpd, false, 0);
1353 } else {
1354 genpd_sync_power_on(genpd, false, 0);
1355 genpd->suspended_count--;
1356 }
1357}
1358
1359void pm_genpd_syscore_poweroff(struct device *dev)
1360{
1361 genpd_syscore_switch(dev, true);
1362}
1363EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff);
1364
1365void pm_genpd_syscore_poweron(struct device *dev)
1366{
1367 genpd_syscore_switch(dev, false);
1368}
1369EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron);
1370
1371#else /* !CONFIG_PM_SLEEP */
1372
1373#define genpd_prepare NULL
1374#define genpd_suspend_noirq NULL
1375#define genpd_resume_noirq NULL
1376#define genpd_freeze_noirq NULL
1377#define genpd_thaw_noirq NULL
1378#define genpd_poweroff_noirq NULL
1379#define genpd_restore_noirq NULL
1380#define genpd_complete NULL
1381
1382#endif /* CONFIG_PM_SLEEP */
1383
1384static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev)
1385{
1386 struct generic_pm_domain_data *gpd_data;
1387 int ret;
1388
1389 ret = dev_pm_get_subsys_data(dev);
1390 if (ret)
1391 return ERR_PTR(ret);
1392
1393 gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
1394 if (!gpd_data) {
1395 ret = -ENOMEM;
1396 goto err_put;
1397 }
1398
1399 gpd_data->base.dev = dev;
1400 gpd_data->td.constraint_changed = true;
1401 gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS;
1402 gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
1403
1404 spin_lock_irq(&dev->power.lock);
1405
1406 if (dev->power.subsys_data->domain_data) {
1407 ret = -EINVAL;
1408 goto err_free;
1409 }
1410
1411 dev->power.subsys_data->domain_data = &gpd_data->base;
1412
1413 spin_unlock_irq(&dev->power.lock);
1414
1415 return gpd_data;
1416
1417 err_free:
1418 spin_unlock_irq(&dev->power.lock);
1419 kfree(gpd_data);
1420 err_put:
1421 dev_pm_put_subsys_data(dev);
1422 return ERR_PTR(ret);
1423}
1424
1425static void genpd_free_dev_data(struct device *dev,
1426 struct generic_pm_domain_data *gpd_data)
1427{
1428 spin_lock_irq(&dev->power.lock);
1429
1430 dev->power.subsys_data->domain_data = NULL;
1431
1432 spin_unlock_irq(&dev->power.lock);
1433
1434 kfree(gpd_data);
1435 dev_pm_put_subsys_data(dev);
1436}
1437
1438static void genpd_update_cpumask(struct generic_pm_domain *genpd,
1439 int cpu, bool set, unsigned int depth)
1440{
1441 struct gpd_link *link;
1442
1443 if (!genpd_is_cpu_domain(genpd))
1444 return;
1445
1446 list_for_each_entry(link, &genpd->child_links, child_node) {
1447 struct generic_pm_domain *parent = link->parent;
1448
1449 genpd_lock_nested(parent, depth + 1);
1450 genpd_update_cpumask(parent, cpu, set, depth + 1);
1451 genpd_unlock(parent);
1452 }
1453
1454 if (set)
1455 cpumask_set_cpu(cpu, genpd->cpus);
1456 else
1457 cpumask_clear_cpu(cpu, genpd->cpus);
1458}
1459
1460static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu)
1461{
1462 if (cpu >= 0)
1463 genpd_update_cpumask(genpd, cpu, true, 0);
1464}
1465
1466static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu)
1467{
1468 if (cpu >= 0)
1469 genpd_update_cpumask(genpd, cpu, false, 0);
1470}
1471
1472static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev)
1473{
1474 int cpu;
1475
1476 if (!genpd_is_cpu_domain(genpd))
1477 return -1;
1478
1479 for_each_possible_cpu(cpu) {
1480 if (get_cpu_device(cpu) == dev)
1481 return cpu;
1482 }
1483
1484 return -1;
1485}
1486
1487static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
1488 struct device *base_dev)
1489{
1490 struct generic_pm_domain_data *gpd_data;
1491 int ret;
1492
1493 dev_dbg(dev, "%s()\n", __func__);
1494
1495 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
1496 return -EINVAL;
1497
1498 gpd_data = genpd_alloc_dev_data(dev);
1499 if (IS_ERR(gpd_data))
1500 return PTR_ERR(gpd_data);
1501
1502 gpd_data->cpu = genpd_get_cpu(genpd, base_dev);
1503
1504 ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
1505 if (ret)
1506 goto out;
1507
1508 genpd_lock(genpd);
1509
1510 genpd_set_cpumask(genpd, gpd_data->cpu);
1511 dev_pm_domain_set(dev, &genpd->domain);
1512
1513 genpd->device_count++;
1514 genpd->max_off_time_changed = true;
1515
1516 list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
1517
1518 genpd_unlock(genpd);
1519 out:
1520 if (ret)
1521 genpd_free_dev_data(dev, gpd_data);
1522 else
1523 dev_pm_qos_add_notifier(dev, &gpd_data->nb,
1524 DEV_PM_QOS_RESUME_LATENCY);
1525
1526 return ret;
1527}
1528
1529/**
1530 * pm_genpd_add_device - Add a device to an I/O PM domain.
1531 * @genpd: PM domain to add the device to.
1532 * @dev: Device to be added.
1533 */
1534int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
1535{
1536 int ret;
1537
1538 mutex_lock(&gpd_list_lock);
1539 ret = genpd_add_device(genpd, dev, dev);
1540 mutex_unlock(&gpd_list_lock);
1541
1542 return ret;
1543}
1544EXPORT_SYMBOL_GPL(pm_genpd_add_device);
1545
1546static int genpd_remove_device(struct generic_pm_domain *genpd,
1547 struct device *dev)
1548{
1549 struct generic_pm_domain_data *gpd_data;
1550 struct pm_domain_data *pdd;
1551 int ret = 0;
1552
1553 dev_dbg(dev, "%s()\n", __func__);
1554
1555 pdd = dev->power.subsys_data->domain_data;
1556 gpd_data = to_gpd_data(pdd);
1557 dev_pm_qos_remove_notifier(dev, &gpd_data->nb,
1558 DEV_PM_QOS_RESUME_LATENCY);
1559
1560 genpd_lock(genpd);
1561
1562 if (genpd->prepared_count > 0) {
1563 ret = -EAGAIN;
1564 goto out;
1565 }
1566
1567 genpd->device_count--;
1568 genpd->max_off_time_changed = true;
1569
1570 genpd_clear_cpumask(genpd, gpd_data->cpu);
1571 dev_pm_domain_set(dev, NULL);
1572
1573 list_del_init(&pdd->list_node);
1574
1575 genpd_unlock(genpd);
1576
1577 if (genpd->detach_dev)
1578 genpd->detach_dev(genpd, dev);
1579
1580 genpd_free_dev_data(dev, gpd_data);
1581
1582 return 0;
1583
1584 out:
1585 genpd_unlock(genpd);
1586 dev_pm_qos_add_notifier(dev, &gpd_data->nb, DEV_PM_QOS_RESUME_LATENCY);
1587
1588 return ret;
1589}
1590
1591/**
1592 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
1593 * @dev: Device to be removed.
1594 */
1595int pm_genpd_remove_device(struct device *dev)
1596{
1597 struct generic_pm_domain *genpd = dev_to_genpd_safe(dev);
1598
1599 if (!genpd)
1600 return -EINVAL;
1601
1602 return genpd_remove_device(genpd, dev);
1603}
1604EXPORT_SYMBOL_GPL(pm_genpd_remove_device);
1605
1606static int genpd_add_subdomain(struct generic_pm_domain *genpd,
1607 struct generic_pm_domain *subdomain)
1608{
1609 struct gpd_link *link, *itr;
1610 int ret = 0;
1611
1612 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
1613 || genpd == subdomain)
1614 return -EINVAL;
1615
1616 /*
1617 * If the domain can be powered on/off in an IRQ safe
1618 * context, ensure that the subdomain can also be
1619 * powered on/off in that context.
1620 */
1621 if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) {
1622 WARN(1, "Parent %s of subdomain %s must be IRQ safe\n",
1623 genpd->name, subdomain->name);
1624 return -EINVAL;
1625 }
1626
1627 link = kzalloc(sizeof(*link), GFP_KERNEL);
1628 if (!link)
1629 return -ENOMEM;
1630
1631 genpd_lock(subdomain);
1632 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
1633
1634 if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) {
1635 ret = -EINVAL;
1636 goto out;
1637 }
1638
1639 list_for_each_entry(itr, &genpd->parent_links, parent_node) {
1640 if (itr->child == subdomain && itr->parent == genpd) {
1641 ret = -EINVAL;
1642 goto out;
1643 }
1644 }
1645
1646 link->parent = genpd;
1647 list_add_tail(&link->parent_node, &genpd->parent_links);
1648 link->child = subdomain;
1649 list_add_tail(&link->child_node, &subdomain->child_links);
1650 if (genpd_status_on(subdomain))
1651 genpd_sd_counter_inc(genpd);
1652
1653 out:
1654 genpd_unlock(genpd);
1655 genpd_unlock(subdomain);
1656 if (ret)
1657 kfree(link);
1658 return ret;
1659}
1660
1661/**
1662 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
1663 * @genpd: Leader PM domain to add the subdomain to.
1664 * @subdomain: Subdomain to be added.
1665 */
1666int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
1667 struct generic_pm_domain *subdomain)
1668{
1669 int ret;
1670
1671 mutex_lock(&gpd_list_lock);
1672 ret = genpd_add_subdomain(genpd, subdomain);
1673 mutex_unlock(&gpd_list_lock);
1674
1675 return ret;
1676}
1677EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain);
1678
1679/**
1680 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
1681 * @genpd: Leader PM domain to remove the subdomain from.
1682 * @subdomain: Subdomain to be removed.
1683 */
1684int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
1685 struct generic_pm_domain *subdomain)
1686{
1687 struct gpd_link *l, *link;
1688 int ret = -EINVAL;
1689
1690 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
1691 return -EINVAL;
1692
1693 genpd_lock(subdomain);
1694 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
1695
1696 if (!list_empty(&subdomain->parent_links) || subdomain->device_count) {
1697 pr_warn("%s: unable to remove subdomain %s\n",
1698 genpd->name, subdomain->name);
1699 ret = -EBUSY;
1700 goto out;
1701 }
1702
1703 list_for_each_entry_safe(link, l, &genpd->parent_links, parent_node) {
1704 if (link->child != subdomain)
1705 continue;
1706
1707 list_del(&link->parent_node);
1708 list_del(&link->child_node);
1709 kfree(link);
1710 if (genpd_status_on(subdomain))
1711 genpd_sd_counter_dec(genpd);
1712
1713 ret = 0;
1714 break;
1715 }
1716
1717out:
1718 genpd_unlock(genpd);
1719 genpd_unlock(subdomain);
1720
1721 return ret;
1722}
1723EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain);
1724
1725static void genpd_free_default_power_state(struct genpd_power_state *states,
1726 unsigned int state_count)
1727{
1728 kfree(states);
1729}
1730
1731static int genpd_set_default_power_state(struct generic_pm_domain *genpd)
1732{
1733 struct genpd_power_state *state;
1734
1735 state = kzalloc(sizeof(*state), GFP_KERNEL);
1736 if (!state)
1737 return -ENOMEM;
1738
1739 genpd->states = state;
1740 genpd->state_count = 1;
1741 genpd->free_states = genpd_free_default_power_state;
1742
1743 return 0;
1744}
1745
1746static void genpd_lock_init(struct generic_pm_domain *genpd)
1747{
1748 if (genpd->flags & GENPD_FLAG_IRQ_SAFE) {
1749 spin_lock_init(&genpd->slock);
1750 genpd->lock_ops = &genpd_spin_ops;
1751 } else {
1752 mutex_init(&genpd->mlock);
1753 genpd->lock_ops = &genpd_mtx_ops;
1754 }
1755}
1756
1757/**
1758 * pm_genpd_init - Initialize a generic I/O PM domain object.
1759 * @genpd: PM domain object to initialize.
1760 * @gov: PM domain governor to associate with the domain (may be NULL).
1761 * @is_off: Initial value of the domain's power_is_off field.
1762 *
1763 * Returns 0 on successful initialization, else a negative error code.
1764 */
1765int pm_genpd_init(struct generic_pm_domain *genpd,
1766 struct dev_power_governor *gov, bool is_off)
1767{
1768 int ret;
1769
1770 if (IS_ERR_OR_NULL(genpd))
1771 return -EINVAL;
1772
1773 INIT_LIST_HEAD(&genpd->parent_links);
1774 INIT_LIST_HEAD(&genpd->child_links);
1775 INIT_LIST_HEAD(&genpd->dev_list);
1776 genpd_lock_init(genpd);
1777 genpd->gov = gov;
1778 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
1779 atomic_set(&genpd->sd_count, 0);
1780 genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
1781 genpd->device_count = 0;
1782 genpd->max_off_time_ns = -1;
1783 genpd->max_off_time_changed = true;
1784 genpd->provider = NULL;
1785 genpd->has_provider = false;
1786 genpd->accounting_time = ktime_get();
1787 genpd->domain.ops.runtime_suspend = genpd_runtime_suspend;
1788 genpd->domain.ops.runtime_resume = genpd_runtime_resume;
1789 genpd->domain.ops.prepare = genpd_prepare;
1790 genpd->domain.ops.suspend_noirq = genpd_suspend_noirq;
1791 genpd->domain.ops.resume_noirq = genpd_resume_noirq;
1792 genpd->domain.ops.freeze_noirq = genpd_freeze_noirq;
1793 genpd->domain.ops.thaw_noirq = genpd_thaw_noirq;
1794 genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq;
1795 genpd->domain.ops.restore_noirq = genpd_restore_noirq;
1796 genpd->domain.ops.complete = genpd_complete;
1797 genpd->domain.start = genpd_dev_pm_start;
1798
1799 if (genpd->flags & GENPD_FLAG_PM_CLK) {
1800 genpd->dev_ops.stop = pm_clk_suspend;
1801 genpd->dev_ops.start = pm_clk_resume;
1802 }
1803
1804 /* Always-on domains must be powered on at initialization. */
1805 if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) &&
1806 !genpd_status_on(genpd))
1807 return -EINVAL;
1808
1809 if (genpd_is_cpu_domain(genpd) &&
1810 !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL))
1811 return -ENOMEM;
1812
1813 /* Use only one "off" state if there were no states declared */
1814 if (genpd->state_count == 0) {
1815 ret = genpd_set_default_power_state(genpd);
1816 if (ret) {
1817 if (genpd_is_cpu_domain(genpd))
1818 free_cpumask_var(genpd->cpus);
1819 return ret;
1820 }
1821 } else if (!gov && genpd->state_count > 1) {
1822 pr_warn("%s: no governor for states\n", genpd->name);
1823 }
1824
1825 device_initialize(&genpd->dev);
1826 dev_set_name(&genpd->dev, "%s", genpd->name);
1827
1828 mutex_lock(&gpd_list_lock);
1829 list_add(&genpd->gpd_list_node, &gpd_list);
1830 mutex_unlock(&gpd_list_lock);
1831
1832 return 0;
1833}
1834EXPORT_SYMBOL_GPL(pm_genpd_init);
1835
1836static int genpd_remove(struct generic_pm_domain *genpd)
1837{
1838 struct gpd_link *l, *link;
1839
1840 if (IS_ERR_OR_NULL(genpd))
1841 return -EINVAL;
1842
1843 genpd_lock(genpd);
1844
1845 if (genpd->has_provider) {
1846 genpd_unlock(genpd);
1847 pr_err("Provider present, unable to remove %s\n", genpd->name);
1848 return -EBUSY;
1849 }
1850
1851 if (!list_empty(&genpd->parent_links) || genpd->device_count) {
1852 genpd_unlock(genpd);
1853 pr_err("%s: unable to remove %s\n", __func__, genpd->name);
1854 return -EBUSY;
1855 }
1856
1857 list_for_each_entry_safe(link, l, &genpd->child_links, child_node) {
1858 list_del(&link->parent_node);
1859 list_del(&link->child_node);
1860 kfree(link);
1861 }
1862
1863 list_del(&genpd->gpd_list_node);
1864 genpd_unlock(genpd);
1865 cancel_work_sync(&genpd->power_off_work);
1866 if (genpd_is_cpu_domain(genpd))
1867 free_cpumask_var(genpd->cpus);
1868 if (genpd->free_states)
1869 genpd->free_states(genpd->states, genpd->state_count);
1870
1871 pr_debug("%s: removed %s\n", __func__, genpd->name);
1872
1873 return 0;
1874}
1875
1876/**
1877 * pm_genpd_remove - Remove a generic I/O PM domain
1878 * @genpd: Pointer to PM domain that is to be removed.
1879 *
1880 * To remove the PM domain, this function:
1881 * - Removes the PM domain as a subdomain to any parent domains,
1882 * if it was added.
1883 * - Removes the PM domain from the list of registered PM domains.
1884 *
1885 * The PM domain will only be removed, if the associated provider has
1886 * been removed, it is not a parent to any other PM domain and has no
1887 * devices associated with it.
1888 */
1889int pm_genpd_remove(struct generic_pm_domain *genpd)
1890{
1891 int ret;
1892
1893 mutex_lock(&gpd_list_lock);
1894 ret = genpd_remove(genpd);
1895 mutex_unlock(&gpd_list_lock);
1896
1897 return ret;
1898}
1899EXPORT_SYMBOL_GPL(pm_genpd_remove);
1900
1901#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
1902
1903/*
1904 * Device Tree based PM domain providers.
1905 *
1906 * The code below implements generic device tree based PM domain providers that
1907 * bind device tree nodes with generic PM domains registered in the system.
1908 *
1909 * Any driver that registers generic PM domains and needs to support binding of
1910 * devices to these domains is supposed to register a PM domain provider, which
1911 * maps a PM domain specifier retrieved from the device tree to a PM domain.
1912 *
1913 * Two simple mapping functions have been provided for convenience:
1914 * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping.
1915 * - genpd_xlate_onecell() for mapping of multiple PM domains per node by
1916 * index.
1917 */
1918
1919/**
1920 * struct of_genpd_provider - PM domain provider registration structure
1921 * @link: Entry in global list of PM domain providers
1922 * @node: Pointer to device tree node of PM domain provider
1923 * @xlate: Provider-specific xlate callback mapping a set of specifier cells
1924 * into a PM domain.
1925 * @data: context pointer to be passed into @xlate callback
1926 */
1927struct of_genpd_provider {
1928 struct list_head link;
1929 struct device_node *node;
1930 genpd_xlate_t xlate;
1931 void *data;
1932};
1933
1934/* List of registered PM domain providers. */
1935static LIST_HEAD(of_genpd_providers);
1936/* Mutex to protect the list above. */
1937static DEFINE_MUTEX(of_genpd_mutex);
1938
1939/**
1940 * genpd_xlate_simple() - Xlate function for direct node-domain mapping
1941 * @genpdspec: OF phandle args to map into a PM domain
1942 * @data: xlate function private data - pointer to struct generic_pm_domain
1943 *
1944 * This is a generic xlate function that can be used to model PM domains that
1945 * have their own device tree nodes. The private data of xlate function needs
1946 * to be a valid pointer to struct generic_pm_domain.
1947 */
1948static struct generic_pm_domain *genpd_xlate_simple(
1949 struct of_phandle_args *genpdspec,
1950 void *data)
1951{
1952 return data;
1953}
1954
1955/**
1956 * genpd_xlate_onecell() - Xlate function using a single index.
1957 * @genpdspec: OF phandle args to map into a PM domain
1958 * @data: xlate function private data - pointer to struct genpd_onecell_data
1959 *
1960 * This is a generic xlate function that can be used to model simple PM domain
1961 * controllers that have one device tree node and provide multiple PM domains.
1962 * A single cell is used as an index into an array of PM domains specified in
1963 * the genpd_onecell_data struct when registering the provider.
1964 */
1965static struct generic_pm_domain *genpd_xlate_onecell(
1966 struct of_phandle_args *genpdspec,
1967 void *data)
1968{
1969 struct genpd_onecell_data *genpd_data = data;
1970 unsigned int idx = genpdspec->args[0];
1971
1972 if (genpdspec->args_count != 1)
1973 return ERR_PTR(-EINVAL);
1974
1975 if (idx >= genpd_data->num_domains) {
1976 pr_err("%s: invalid domain index %u\n", __func__, idx);
1977 return ERR_PTR(-EINVAL);
1978 }
1979
1980 if (!genpd_data->domains[idx])
1981 return ERR_PTR(-ENOENT);
1982
1983 return genpd_data->domains[idx];
1984}
1985
1986/**
1987 * genpd_add_provider() - Register a PM domain provider for a node
1988 * @np: Device node pointer associated with the PM domain provider.
1989 * @xlate: Callback for decoding PM domain from phandle arguments.
1990 * @data: Context pointer for @xlate callback.
1991 */
1992static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
1993 void *data)
1994{
1995 struct of_genpd_provider *cp;
1996
1997 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
1998 if (!cp)
1999 return -ENOMEM;
2000
2001 cp->node = of_node_get(np);
2002 cp->data = data;
2003 cp->xlate = xlate;
2004
2005 mutex_lock(&of_genpd_mutex);
2006 list_add(&cp->link, &of_genpd_providers);
2007 mutex_unlock(&of_genpd_mutex);
2008 pr_debug("Added domain provider from %pOF\n", np);
2009
2010 return 0;
2011}
2012
2013static bool genpd_present(const struct generic_pm_domain *genpd)
2014{
2015 const struct generic_pm_domain *gpd;
2016
2017 list_for_each_entry(gpd, &gpd_list, gpd_list_node)
2018 if (gpd == genpd)
2019 return true;
2020 return false;
2021}
2022
2023/**
2024 * of_genpd_add_provider_simple() - Register a simple PM domain provider
2025 * @np: Device node pointer associated with the PM domain provider.
2026 * @genpd: Pointer to PM domain associated with the PM domain provider.
2027 */
2028int of_genpd_add_provider_simple(struct device_node *np,
2029 struct generic_pm_domain *genpd)
2030{
2031 int ret = -EINVAL;
2032
2033 if (!np || !genpd)
2034 return -EINVAL;
2035
2036 mutex_lock(&gpd_list_lock);
2037
2038 if (!genpd_present(genpd))
2039 goto unlock;
2040
2041 genpd->dev.of_node = np;
2042
2043 /* Parse genpd OPP table */
2044 if (genpd->set_performance_state) {
2045 ret = dev_pm_opp_of_add_table(&genpd->dev);
2046 if (ret) {
2047 dev_err(&genpd->dev, "Failed to add OPP table: %d\n",
2048 ret);
2049 goto unlock;
2050 }
2051
2052 /*
2053 * Save table for faster processing while setting performance
2054 * state.
2055 */
2056 genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev);
2057 WARN_ON(!genpd->opp_table);
2058 }
2059
2060 ret = genpd_add_provider(np, genpd_xlate_simple, genpd);
2061 if (ret) {
2062 if (genpd->set_performance_state) {
2063 dev_pm_opp_put_opp_table(genpd->opp_table);
2064 dev_pm_opp_of_remove_table(&genpd->dev);
2065 }
2066
2067 goto unlock;
2068 }
2069
2070 genpd->provider = &np->fwnode;
2071 genpd->has_provider = true;
2072
2073unlock:
2074 mutex_unlock(&gpd_list_lock);
2075
2076 return ret;
2077}
2078EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple);
2079
2080/**
2081 * of_genpd_add_provider_onecell() - Register a onecell PM domain provider
2082 * @np: Device node pointer associated with the PM domain provider.
2083 * @data: Pointer to the data associated with the PM domain provider.
2084 */
2085int of_genpd_add_provider_onecell(struct device_node *np,
2086 struct genpd_onecell_data *data)
2087{
2088 struct generic_pm_domain *genpd;
2089 unsigned int i;
2090 int ret = -EINVAL;
2091
2092 if (!np || !data)
2093 return -EINVAL;
2094
2095 mutex_lock(&gpd_list_lock);
2096
2097 if (!data->xlate)
2098 data->xlate = genpd_xlate_onecell;
2099
2100 for (i = 0; i < data->num_domains; i++) {
2101 genpd = data->domains[i];
2102
2103 if (!genpd)
2104 continue;
2105 if (!genpd_present(genpd))
2106 goto error;
2107
2108 genpd->dev.of_node = np;
2109
2110 /* Parse genpd OPP table */
2111 if (genpd->set_performance_state) {
2112 ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i);
2113 if (ret) {
2114 dev_err(&genpd->dev, "Failed to add OPP table for index %d: %d\n",
2115 i, ret);
2116 goto error;
2117 }
2118
2119 /*
2120 * Save table for faster processing while setting
2121 * performance state.
2122 */
2123 genpd->opp_table = dev_pm_opp_get_opp_table_indexed(&genpd->dev, i);
2124 WARN_ON(!genpd->opp_table);
2125 }
2126
2127 genpd->provider = &np->fwnode;
2128 genpd->has_provider = true;
2129 }
2130
2131 ret = genpd_add_provider(np, data->xlate, data);
2132 if (ret < 0)
2133 goto error;
2134
2135 mutex_unlock(&gpd_list_lock);
2136
2137 return 0;
2138
2139error:
2140 while (i--) {
2141 genpd = data->domains[i];
2142
2143 if (!genpd)
2144 continue;
2145
2146 genpd->provider = NULL;
2147 genpd->has_provider = false;
2148
2149 if (genpd->set_performance_state) {
2150 dev_pm_opp_put_opp_table(genpd->opp_table);
2151 dev_pm_opp_of_remove_table(&genpd->dev);
2152 }
2153 }
2154
2155 mutex_unlock(&gpd_list_lock);
2156
2157 return ret;
2158}
2159EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell);
2160
2161/**
2162 * of_genpd_del_provider() - Remove a previously registered PM domain provider
2163 * @np: Device node pointer associated with the PM domain provider
2164 */
2165void of_genpd_del_provider(struct device_node *np)
2166{
2167 struct of_genpd_provider *cp, *tmp;
2168 struct generic_pm_domain *gpd;
2169
2170 mutex_lock(&gpd_list_lock);
2171 mutex_lock(&of_genpd_mutex);
2172 list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) {
2173 if (cp->node == np) {
2174 /*
2175 * For each PM domain associated with the
2176 * provider, set the 'has_provider' to false
2177 * so that the PM domain can be safely removed.
2178 */
2179 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
2180 if (gpd->provider == &np->fwnode) {
2181 gpd->has_provider = false;
2182
2183 if (!gpd->set_performance_state)
2184 continue;
2185
2186 dev_pm_opp_put_opp_table(gpd->opp_table);
2187 dev_pm_opp_of_remove_table(&gpd->dev);
2188 }
2189 }
2190
2191 list_del(&cp->link);
2192 of_node_put(cp->node);
2193 kfree(cp);
2194 break;
2195 }
2196 }
2197 mutex_unlock(&of_genpd_mutex);
2198 mutex_unlock(&gpd_list_lock);
2199}
2200EXPORT_SYMBOL_GPL(of_genpd_del_provider);
2201
2202/**
2203 * genpd_get_from_provider() - Look-up PM domain
2204 * @genpdspec: OF phandle args to use for look-up
2205 *
2206 * Looks for a PM domain provider under the node specified by @genpdspec and if
2207 * found, uses xlate function of the provider to map phandle args to a PM
2208 * domain.
2209 *
2210 * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
2211 * on failure.
2212 */
2213static struct generic_pm_domain *genpd_get_from_provider(
2214 struct of_phandle_args *genpdspec)
2215{
2216 struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
2217 struct of_genpd_provider *provider;
2218
2219 if (!genpdspec)
2220 return ERR_PTR(-EINVAL);
2221
2222 mutex_lock(&of_genpd_mutex);
2223
2224 /* Check if we have such a provider in our array */
2225 list_for_each_entry(provider, &of_genpd_providers, link) {
2226 if (provider->node == genpdspec->np)
2227 genpd = provider->xlate(genpdspec, provider->data);
2228 if (!IS_ERR(genpd))
2229 break;
2230 }
2231
2232 mutex_unlock(&of_genpd_mutex);
2233
2234 return genpd;
2235}
2236
2237/**
2238 * of_genpd_add_device() - Add a device to an I/O PM domain
2239 * @genpdspec: OF phandle args to use for look-up PM domain
2240 * @dev: Device to be added.
2241 *
2242 * Looks-up an I/O PM domain based upon phandle args provided and adds
2243 * the device to the PM domain. Returns a negative error code on failure.
2244 */
2245int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev)
2246{
2247 struct generic_pm_domain *genpd;
2248 int ret;
2249
2250 mutex_lock(&gpd_list_lock);
2251
2252 genpd = genpd_get_from_provider(genpdspec);
2253 if (IS_ERR(genpd)) {
2254 ret = PTR_ERR(genpd);
2255 goto out;
2256 }
2257
2258 ret = genpd_add_device(genpd, dev, dev);
2259
2260out:
2261 mutex_unlock(&gpd_list_lock);
2262
2263 return ret;
2264}
2265EXPORT_SYMBOL_GPL(of_genpd_add_device);
2266
2267/**
2268 * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
2269 * @parent_spec: OF phandle args to use for parent PM domain look-up
2270 * @subdomain_spec: OF phandle args to use for subdomain look-up
2271 *
2272 * Looks-up a parent PM domain and subdomain based upon phandle args
2273 * provided and adds the subdomain to the parent PM domain. Returns a
2274 * negative error code on failure.
2275 */
2276int of_genpd_add_subdomain(struct of_phandle_args *parent_spec,
2277 struct of_phandle_args *subdomain_spec)
2278{
2279 struct generic_pm_domain *parent, *subdomain;
2280 int ret;
2281
2282 mutex_lock(&gpd_list_lock);
2283
2284 parent = genpd_get_from_provider(parent_spec);
2285 if (IS_ERR(parent)) {
2286 ret = PTR_ERR(parent);
2287 goto out;
2288 }
2289
2290 subdomain = genpd_get_from_provider(subdomain_spec);
2291 if (IS_ERR(subdomain)) {
2292 ret = PTR_ERR(subdomain);
2293 goto out;
2294 }
2295
2296 ret = genpd_add_subdomain(parent, subdomain);
2297
2298out:
2299 mutex_unlock(&gpd_list_lock);
2300
2301 return ret;
2302}
2303EXPORT_SYMBOL_GPL(of_genpd_add_subdomain);
2304
2305/**
2306 * of_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
2307 * @parent_spec: OF phandle args to use for parent PM domain look-up
2308 * @subdomain_spec: OF phandle args to use for subdomain look-up
2309 *
2310 * Looks-up a parent PM domain and subdomain based upon phandle args
2311 * provided and removes the subdomain from the parent PM domain. Returns a
2312 * negative error code on failure.
2313 */
2314int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec,
2315 struct of_phandle_args *subdomain_spec)
2316{
2317 struct generic_pm_domain *parent, *subdomain;
2318 int ret;
2319
2320 mutex_lock(&gpd_list_lock);
2321
2322 parent = genpd_get_from_provider(parent_spec);
2323 if (IS_ERR(parent)) {
2324 ret = PTR_ERR(parent);
2325 goto out;
2326 }
2327
2328 subdomain = genpd_get_from_provider(subdomain_spec);
2329 if (IS_ERR(subdomain)) {
2330 ret = PTR_ERR(subdomain);
2331 goto out;
2332 }
2333
2334 ret = pm_genpd_remove_subdomain(parent, subdomain);
2335
2336out:
2337 mutex_unlock(&gpd_list_lock);
2338
2339 return ret;
2340}
2341EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain);
2342
2343/**
2344 * of_genpd_remove_last - Remove the last PM domain registered for a provider
2345 * @provider: Pointer to device structure associated with provider
2346 *
2347 * Find the last PM domain that was added by a particular provider and
2348 * remove this PM domain from the list of PM domains. The provider is
2349 * identified by the 'provider' device structure that is passed. The PM
2350 * domain will only be removed, if the provider associated with domain
2351 * has been removed.
2352 *
2353 * Returns a valid pointer to struct generic_pm_domain on success or
2354 * ERR_PTR() on failure.
2355 */
2356struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
2357{
2358 struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT);
2359 int ret;
2360
2361 if (IS_ERR_OR_NULL(np))
2362 return ERR_PTR(-EINVAL);
2363
2364 mutex_lock(&gpd_list_lock);
2365 list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) {
2366 if (gpd->provider == &np->fwnode) {
2367 ret = genpd_remove(gpd);
2368 genpd = ret ? ERR_PTR(ret) : gpd;
2369 break;
2370 }
2371 }
2372 mutex_unlock(&gpd_list_lock);
2373
2374 return genpd;
2375}
2376EXPORT_SYMBOL_GPL(of_genpd_remove_last);
2377
2378static void genpd_release_dev(struct device *dev)
2379{
2380 of_node_put(dev->of_node);
2381 kfree(dev);
2382}
2383
2384static struct bus_type genpd_bus_type = {
2385 .name = "genpd",
2386};
2387
2388/**
2389 * genpd_dev_pm_detach - Detach a device from its PM domain.
2390 * @dev: Device to detach.
2391 * @power_off: Currently not used
2392 *
2393 * Try to locate a corresponding generic PM domain, which the device was
2394 * attached to previously. If such is found, the device is detached from it.
2395 */
2396static void genpd_dev_pm_detach(struct device *dev, bool power_off)
2397{
2398 struct generic_pm_domain *pd;
2399 unsigned int i;
2400 int ret = 0;
2401
2402 pd = dev_to_genpd(dev);
2403 if (IS_ERR(pd))
2404 return;
2405
2406 dev_dbg(dev, "removing from PM domain %s\n", pd->name);
2407
2408 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
2409 ret = genpd_remove_device(pd, dev);
2410 if (ret != -EAGAIN)
2411 break;
2412
2413 mdelay(i);
2414 cond_resched();
2415 }
2416
2417 if (ret < 0) {
2418 dev_err(dev, "failed to remove from PM domain %s: %d",
2419 pd->name, ret);
2420 return;
2421 }
2422
2423 /* Check if PM domain can be powered off after removing this device. */
2424 genpd_queue_power_off_work(pd);
2425
2426 /* Unregister the device if it was created by genpd. */
2427 if (dev->bus == &genpd_bus_type)
2428 device_unregister(dev);
2429}
2430
2431static void genpd_dev_pm_sync(struct device *dev)
2432{
2433 struct generic_pm_domain *pd;
2434
2435 pd = dev_to_genpd(dev);
2436 if (IS_ERR(pd))
2437 return;
2438
2439 genpd_queue_power_off_work(pd);
2440}
2441
2442static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
2443 unsigned int index, bool power_on)
2444{
2445 struct of_phandle_args pd_args;
2446 struct generic_pm_domain *pd;
2447 int ret;
2448
2449 ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
2450 "#power-domain-cells", index, &pd_args);
2451 if (ret < 0)
2452 return ret;
2453
2454 mutex_lock(&gpd_list_lock);
2455 pd = genpd_get_from_provider(&pd_args);
2456 of_node_put(pd_args.np);
2457 if (IS_ERR(pd)) {
2458 mutex_unlock(&gpd_list_lock);
2459 dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
2460 __func__, PTR_ERR(pd));
2461 return driver_deferred_probe_check_state(base_dev);
2462 }
2463
2464 dev_dbg(dev, "adding to PM domain %s\n", pd->name);
2465
2466 ret = genpd_add_device(pd, dev, base_dev);
2467 mutex_unlock(&gpd_list_lock);
2468
2469 if (ret < 0) {
2470 if (ret != -EPROBE_DEFER)
2471 dev_err(dev, "failed to add to PM domain %s: %d",
2472 pd->name, ret);
2473 return ret;
2474 }
2475
2476 dev->pm_domain->detach = genpd_dev_pm_detach;
2477 dev->pm_domain->sync = genpd_dev_pm_sync;
2478
2479 if (power_on) {
2480 genpd_lock(pd);
2481 ret = genpd_power_on(pd, 0);
2482 genpd_unlock(pd);
2483 }
2484
2485 if (ret)
2486 genpd_remove_device(pd, dev);
2487
2488 return ret ? -EPROBE_DEFER : 1;
2489}
2490
2491/**
2492 * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
2493 * @dev: Device to attach.
2494 *
2495 * Parse device's OF node to find a PM domain specifier. If such is found,
2496 * attaches the device to retrieved pm_domain ops.
2497 *
2498 * Returns 1 on successfully attached PM domain, 0 when the device don't need a
2499 * PM domain or when multiple power-domains exists for it, else a negative error
2500 * code. Note that if a power-domain exists for the device, but it cannot be
2501 * found or turned on, then return -EPROBE_DEFER to ensure that the device is
2502 * not probed and to re-try again later.
2503 */
2504int genpd_dev_pm_attach(struct device *dev)
2505{
2506 if (!dev->of_node)
2507 return 0;
2508
2509 /*
2510 * Devices with multiple PM domains must be attached separately, as we
2511 * can only attach one PM domain per device.
2512 */
2513 if (of_count_phandle_with_args(dev->of_node, "power-domains",
2514 "#power-domain-cells") != 1)
2515 return 0;
2516
2517 return __genpd_dev_pm_attach(dev, dev, 0, true);
2518}
2519EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
2520
2521/**
2522 * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains.
2523 * @dev: The device used to lookup the PM domain.
2524 * @index: The index of the PM domain.
2525 *
2526 * Parse device's OF node to find a PM domain specifier at the provided @index.
2527 * If such is found, creates a virtual device and attaches it to the retrieved
2528 * pm_domain ops. To deal with detaching of the virtual device, the ->detach()
2529 * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach().
2530 *
2531 * Returns the created virtual device if successfully attached PM domain, NULL
2532 * when the device don't need a PM domain, else an ERR_PTR() in case of
2533 * failures. If a power-domain exists for the device, but cannot be found or
2534 * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device
2535 * is not probed and to re-try again later.
2536 */
2537struct device *genpd_dev_pm_attach_by_id(struct device *dev,
2538 unsigned int index)
2539{
2540 struct device *virt_dev;
2541 int num_domains;
2542 int ret;
2543
2544 if (!dev->of_node)
2545 return NULL;
2546
2547 /* Verify that the index is within a valid range. */
2548 num_domains = of_count_phandle_with_args(dev->of_node, "power-domains",
2549 "#power-domain-cells");
2550 if (index >= num_domains)
2551 return NULL;
2552
2553 /* Allocate and register device on the genpd bus. */
2554 virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL);
2555 if (!virt_dev)
2556 return ERR_PTR(-ENOMEM);
2557
2558 dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev));
2559 virt_dev->bus = &genpd_bus_type;
2560 virt_dev->release = genpd_release_dev;
2561 virt_dev->of_node = of_node_get(dev->of_node);
2562
2563 ret = device_register(virt_dev);
2564 if (ret) {
2565 put_device(virt_dev);
2566 return ERR_PTR(ret);
2567 }
2568
2569 /* Try to attach the device to the PM domain at the specified index. */
2570 ret = __genpd_dev_pm_attach(virt_dev, dev, index, false);
2571 if (ret < 1) {
2572 device_unregister(virt_dev);
2573 return ret ? ERR_PTR(ret) : NULL;
2574 }
2575
2576 pm_runtime_enable(virt_dev);
2577 genpd_queue_power_off_work(dev_to_genpd(virt_dev));
2578
2579 return virt_dev;
2580}
2581EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id);
2582
2583/**
2584 * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains.
2585 * @dev: The device used to lookup the PM domain.
2586 * @name: The name of the PM domain.
2587 *
2588 * Parse device's OF node to find a PM domain specifier using the
2589 * power-domain-names DT property. For further description see
2590 * genpd_dev_pm_attach_by_id().
2591 */
2592struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name)
2593{
2594 int index;
2595
2596 if (!dev->of_node)
2597 return NULL;
2598
2599 index = of_property_match_string(dev->of_node, "power-domain-names",
2600 name);
2601 if (index < 0)
2602 return NULL;
2603
2604 return genpd_dev_pm_attach_by_id(dev, index);
2605}
2606
2607static const struct of_device_id idle_state_match[] = {
2608 { .compatible = "domain-idle-state", },
2609 { }
2610};
2611
2612static int genpd_parse_state(struct genpd_power_state *genpd_state,
2613 struct device_node *state_node)
2614{
2615 int err;
2616 u32 residency;
2617 u32 entry_latency, exit_latency;
2618
2619 err = of_property_read_u32(state_node, "entry-latency-us",
2620 &entry_latency);
2621 if (err) {
2622 pr_debug(" * %pOF missing entry-latency-us property\n",
2623 state_node);
2624 return -EINVAL;
2625 }
2626
2627 err = of_property_read_u32(state_node, "exit-latency-us",
2628 &exit_latency);
2629 if (err) {
2630 pr_debug(" * %pOF missing exit-latency-us property\n",
2631 state_node);
2632 return -EINVAL;
2633 }
2634
2635 err = of_property_read_u32(state_node, "min-residency-us", &residency);
2636 if (!err)
2637 genpd_state->residency_ns = 1000 * residency;
2638
2639 genpd_state->power_on_latency_ns = 1000 * exit_latency;
2640 genpd_state->power_off_latency_ns = 1000 * entry_latency;
2641 genpd_state->fwnode = &state_node->fwnode;
2642
2643 return 0;
2644}
2645
2646static int genpd_iterate_idle_states(struct device_node *dn,
2647 struct genpd_power_state *states)
2648{
2649 int ret;
2650 struct of_phandle_iterator it;
2651 struct device_node *np;
2652 int i = 0;
2653
2654 ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL);
2655 if (ret <= 0)
2656 return ret == -ENOENT ? 0 : ret;
2657
2658 /* Loop over the phandles until all the requested entry is found */
2659 of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) {
2660 np = it.node;
2661 if (!of_match_node(idle_state_match, np))
2662 continue;
2663 if (states) {
2664 ret = genpd_parse_state(&states[i], np);
2665 if (ret) {
2666 pr_err("Parsing idle state node %pOF failed with err %d\n",
2667 np, ret);
2668 of_node_put(np);
2669 return ret;
2670 }
2671 }
2672 i++;
2673 }
2674
2675 return i;
2676}
2677
2678/**
2679 * of_genpd_parse_idle_states: Return array of idle states for the genpd.
2680 *
2681 * @dn: The genpd device node
2682 * @states: The pointer to which the state array will be saved.
2683 * @n: The count of elements in the array returned from this function.
2684 *
2685 * Returns the device states parsed from the OF node. The memory for the states
2686 * is allocated by this function and is the responsibility of the caller to
2687 * free the memory after use. If any or zero compatible domain idle states is
2688 * found it returns 0 and in case of errors, a negative error code is returned.
2689 */
2690int of_genpd_parse_idle_states(struct device_node *dn,
2691 struct genpd_power_state **states, int *n)
2692{
2693 struct genpd_power_state *st;
2694 int ret;
2695
2696 ret = genpd_iterate_idle_states(dn, NULL);
2697 if (ret < 0)
2698 return ret;
2699
2700 if (!ret) {
2701 *states = NULL;
2702 *n = 0;
2703 return 0;
2704 }
2705
2706 st = kcalloc(ret, sizeof(*st), GFP_KERNEL);
2707 if (!st)
2708 return -ENOMEM;
2709
2710 ret = genpd_iterate_idle_states(dn, st);
2711 if (ret <= 0) {
2712 kfree(st);
2713 return ret < 0 ? ret : -EINVAL;
2714 }
2715
2716 *states = st;
2717 *n = ret;
2718
2719 return 0;
2720}
2721EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states);
2722
2723/**
2724 * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node.
2725 *
2726 * @genpd_dev: Genpd's device for which the performance-state needs to be found.
2727 * @opp: struct dev_pm_opp of the OPP for which we need to find performance
2728 * state.
2729 *
2730 * Returns performance state encoded in the OPP of the genpd. This calls
2731 * platform specific genpd->opp_to_performance_state() callback to translate
2732 * power domain OPP to performance state.
2733 *
2734 * Returns performance state on success and 0 on failure.
2735 */
2736unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev,
2737 struct dev_pm_opp *opp)
2738{
2739 struct generic_pm_domain *genpd = NULL;
2740 int state;
2741
2742 genpd = container_of(genpd_dev, struct generic_pm_domain, dev);
2743
2744 if (unlikely(!genpd->opp_to_performance_state))
2745 return 0;
2746
2747 genpd_lock(genpd);
2748 state = genpd->opp_to_performance_state(genpd, opp);
2749 genpd_unlock(genpd);
2750
2751 return state;
2752}
2753EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state);
2754
2755static int __init genpd_bus_init(void)
2756{
2757 return bus_register(&genpd_bus_type);
2758}
2759core_initcall(genpd_bus_init);
2760
2761#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
2762
2763
2764/*** debugfs support ***/
2765
2766#ifdef CONFIG_DEBUG_FS
2767#include <linux/pm.h>
2768#include <linux/device.h>
2769#include <linux/debugfs.h>
2770#include <linux/seq_file.h>
2771#include <linux/init.h>
2772#include <linux/kobject.h>
2773static struct dentry *genpd_debugfs_dir;
2774
2775/*
2776 * TODO: This function is a slightly modified version of rtpm_status_show
2777 * from sysfs.c, so generalize it.
2778 */
2779static void rtpm_status_str(struct seq_file *s, struct device *dev)
2780{
2781 static const char * const status_lookup[] = {
2782 [RPM_ACTIVE] = "active",
2783 [RPM_RESUMING] = "resuming",
2784 [RPM_SUSPENDED] = "suspended",
2785 [RPM_SUSPENDING] = "suspending"
2786 };
2787 const char *p = "";
2788
2789 if (dev->power.runtime_error)
2790 p = "error";
2791 else if (dev->power.disable_depth)
2792 p = "unsupported";
2793 else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup))
2794 p = status_lookup[dev->power.runtime_status];
2795 else
2796 WARN_ON(1);
2797
2798 seq_puts(s, p);
2799}
2800
2801static int genpd_summary_one(struct seq_file *s,
2802 struct generic_pm_domain *genpd)
2803{
2804 static const char * const status_lookup[] = {
2805 [GPD_STATE_ACTIVE] = "on",
2806 [GPD_STATE_POWER_OFF] = "off"
2807 };
2808 struct pm_domain_data *pm_data;
2809 const char *kobj_path;
2810 struct gpd_link *link;
2811 char state[16];
2812 int ret;
2813
2814 ret = genpd_lock_interruptible(genpd);
2815 if (ret)
2816 return -ERESTARTSYS;
2817
2818 if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup)))
2819 goto exit;
2820 if (!genpd_status_on(genpd))
2821 snprintf(state, sizeof(state), "%s-%u",
2822 status_lookup[genpd->status], genpd->state_idx);
2823 else
2824 snprintf(state, sizeof(state), "%s",
2825 status_lookup[genpd->status]);
2826 seq_printf(s, "%-30s %-15s ", genpd->name, state);
2827
2828 /*
2829 * Modifications on the list require holding locks on both
2830 * parent and child, so we are safe.
2831 * Also genpd->name is immutable.
2832 */
2833 list_for_each_entry(link, &genpd->parent_links, parent_node) {
2834 seq_printf(s, "%s", link->child->name);
2835 if (!list_is_last(&link->parent_node, &genpd->parent_links))
2836 seq_puts(s, ", ");
2837 }
2838
2839 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
2840 kobj_path = kobject_get_path(&pm_data->dev->kobj,
2841 genpd_is_irq_safe(genpd) ?
2842 GFP_ATOMIC : GFP_KERNEL);
2843 if (kobj_path == NULL)
2844 continue;
2845
2846 seq_printf(s, "\n %-50s ", kobj_path);
2847 rtpm_status_str(s, pm_data->dev);
2848 kfree(kobj_path);
2849 }
2850
2851 seq_puts(s, "\n");
2852exit:
2853 genpd_unlock(genpd);
2854
2855 return 0;
2856}
2857
2858static int summary_show(struct seq_file *s, void *data)
2859{
2860 struct generic_pm_domain *genpd;
2861 int ret = 0;
2862
2863 seq_puts(s, "domain status children\n");
2864 seq_puts(s, " /device runtime status\n");
2865 seq_puts(s, "----------------------------------------------------------------------\n");
2866
2867 ret = mutex_lock_interruptible(&gpd_list_lock);
2868 if (ret)
2869 return -ERESTARTSYS;
2870
2871 list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
2872 ret = genpd_summary_one(s, genpd);
2873 if (ret)
2874 break;
2875 }
2876 mutex_unlock(&gpd_list_lock);
2877
2878 return ret;
2879}
2880
2881static int status_show(struct seq_file *s, void *data)
2882{
2883 static const char * const status_lookup[] = {
2884 [GPD_STATE_ACTIVE] = "on",
2885 [GPD_STATE_POWER_OFF] = "off"
2886 };
2887
2888 struct generic_pm_domain *genpd = s->private;
2889 int ret = 0;
2890
2891 ret = genpd_lock_interruptible(genpd);
2892 if (ret)
2893 return -ERESTARTSYS;
2894
2895 if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup)))
2896 goto exit;
2897
2898 if (genpd->status == GPD_STATE_POWER_OFF)
2899 seq_printf(s, "%s-%u\n", status_lookup[genpd->status],
2900 genpd->state_idx);
2901 else
2902 seq_printf(s, "%s\n", status_lookup[genpd->status]);
2903exit:
2904 genpd_unlock(genpd);
2905 return ret;
2906}
2907
2908static int sub_domains_show(struct seq_file *s, void *data)
2909{
2910 struct generic_pm_domain *genpd = s->private;
2911 struct gpd_link *link;
2912 int ret = 0;
2913
2914 ret = genpd_lock_interruptible(genpd);
2915 if (ret)
2916 return -ERESTARTSYS;
2917
2918 list_for_each_entry(link, &genpd->parent_links, parent_node)
2919 seq_printf(s, "%s\n", link->child->name);
2920
2921 genpd_unlock(genpd);
2922 return ret;
2923}
2924
2925static int idle_states_show(struct seq_file *s, void *data)
2926{
2927 struct generic_pm_domain *genpd = s->private;
2928 unsigned int i;
2929 int ret = 0;
2930
2931 ret = genpd_lock_interruptible(genpd);
2932 if (ret)
2933 return -ERESTARTSYS;
2934
2935 seq_puts(s, "State Time Spent(ms)\n");
2936
2937 for (i = 0; i < genpd->state_count; i++) {
2938 ktime_t delta = 0;
2939 s64 msecs;
2940
2941 if ((genpd->status == GPD_STATE_POWER_OFF) &&
2942 (genpd->state_idx == i))
2943 delta = ktime_sub(ktime_get(), genpd->accounting_time);
2944
2945 msecs = ktime_to_ms(
2946 ktime_add(genpd->states[i].idle_time, delta));
2947 seq_printf(s, "S%-13i %lld\n", i, msecs);
2948 }
2949
2950 genpd_unlock(genpd);
2951 return ret;
2952}
2953
2954static int active_time_show(struct seq_file *s, void *data)
2955{
2956 struct generic_pm_domain *genpd = s->private;
2957 ktime_t delta = 0;
2958 int ret = 0;
2959
2960 ret = genpd_lock_interruptible(genpd);
2961 if (ret)
2962 return -ERESTARTSYS;
2963
2964 if (genpd->status == GPD_STATE_ACTIVE)
2965 delta = ktime_sub(ktime_get(), genpd->accounting_time);
2966
2967 seq_printf(s, "%lld ms\n", ktime_to_ms(
2968 ktime_add(genpd->on_time, delta)));
2969
2970 genpd_unlock(genpd);
2971 return ret;
2972}
2973
2974static int total_idle_time_show(struct seq_file *s, void *data)
2975{
2976 struct generic_pm_domain *genpd = s->private;
2977 ktime_t delta = 0, total = 0;
2978 unsigned int i;
2979 int ret = 0;
2980
2981 ret = genpd_lock_interruptible(genpd);
2982 if (ret)
2983 return -ERESTARTSYS;
2984
2985 for (i = 0; i < genpd->state_count; i++) {
2986
2987 if ((genpd->status == GPD_STATE_POWER_OFF) &&
2988 (genpd->state_idx == i))
2989 delta = ktime_sub(ktime_get(), genpd->accounting_time);
2990
2991 total = ktime_add(total, genpd->states[i].idle_time);
2992 }
2993 total = ktime_add(total, delta);
2994
2995 seq_printf(s, "%lld ms\n", ktime_to_ms(total));
2996
2997 genpd_unlock(genpd);
2998 return ret;
2999}
3000
3001
3002static int devices_show(struct seq_file *s, void *data)
3003{
3004 struct generic_pm_domain *genpd = s->private;
3005 struct pm_domain_data *pm_data;
3006 const char *kobj_path;
3007 int ret = 0;
3008
3009 ret = genpd_lock_interruptible(genpd);
3010 if (ret)
3011 return -ERESTARTSYS;
3012
3013 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
3014 kobj_path = kobject_get_path(&pm_data->dev->kobj,
3015 genpd_is_irq_safe(genpd) ?
3016 GFP_ATOMIC : GFP_KERNEL);
3017 if (kobj_path == NULL)
3018 continue;
3019
3020 seq_printf(s, "%s\n", kobj_path);
3021 kfree(kobj_path);
3022 }
3023
3024 genpd_unlock(genpd);
3025 return ret;
3026}
3027
3028static int perf_state_show(struct seq_file *s, void *data)
3029{
3030 struct generic_pm_domain *genpd = s->private;
3031
3032 if (genpd_lock_interruptible(genpd))
3033 return -ERESTARTSYS;
3034
3035 seq_printf(s, "%u\n", genpd->performance_state);
3036
3037 genpd_unlock(genpd);
3038 return 0;
3039}
3040
3041DEFINE_SHOW_ATTRIBUTE(summary);
3042DEFINE_SHOW_ATTRIBUTE(status);
3043DEFINE_SHOW_ATTRIBUTE(sub_domains);
3044DEFINE_SHOW_ATTRIBUTE(idle_states);
3045DEFINE_SHOW_ATTRIBUTE(active_time);
3046DEFINE_SHOW_ATTRIBUTE(total_idle_time);
3047DEFINE_SHOW_ATTRIBUTE(devices);
3048DEFINE_SHOW_ATTRIBUTE(perf_state);
3049
3050static int __init genpd_debug_init(void)
3051{
3052 struct dentry *d;
3053 struct generic_pm_domain *genpd;
3054
3055 genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL);
3056
3057 debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir,
3058 NULL, &summary_fops);
3059
3060 list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
3061 d = debugfs_create_dir(genpd->name, genpd_debugfs_dir);
3062
3063 debugfs_create_file("current_state", 0444,
3064 d, genpd, &status_fops);
3065 debugfs_create_file("sub_domains", 0444,
3066 d, genpd, &sub_domains_fops);
3067 debugfs_create_file("idle_states", 0444,
3068 d, genpd, &idle_states_fops);
3069 debugfs_create_file("active_time", 0444,
3070 d, genpd, &active_time_fops);
3071 debugfs_create_file("total_idle_time", 0444,
3072 d, genpd, &total_idle_time_fops);
3073 debugfs_create_file("devices", 0444,
3074 d, genpd, &devices_fops);
3075 if (genpd->set_performance_state)
3076 debugfs_create_file("perf_state", 0444,
3077 d, genpd, &perf_state_fops);
3078 }
3079
3080 return 0;
3081}
3082late_initcall(genpd_debug_init);
3083
3084static void __exit genpd_debug_exit(void)
3085{
3086 debugfs_remove_recursive(genpd_debugfs_dir);
3087}
3088__exitcall(genpd_debug_exit);
3089#endif /* CONFIG_DEBUG_FS */
1/*
2 * drivers/base/power/domain.c - Common code related to device power domains.
3 *
4 * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp.
5 *
6 * This file is released under the GPLv2.
7 */
8
9#include <linux/kernel.h>
10#include <linux/io.h>
11#include <linux/pm_runtime.h>
12#include <linux/pm_domain.h>
13#include <linux/pm_qos.h>
14#include <linux/slab.h>
15#include <linux/err.h>
16#include <linux/sched.h>
17#include <linux/suspend.h>
18#include <linux/export.h>
19
20#define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \
21({ \
22 type (*__routine)(struct device *__d); \
23 type __ret = (type)0; \
24 \
25 __routine = genpd->dev_ops.callback; \
26 if (__routine) { \
27 __ret = __routine(dev); \
28 } else { \
29 __routine = dev_gpd_data(dev)->ops.callback; \
30 if (__routine) \
31 __ret = __routine(dev); \
32 } \
33 __ret; \
34})
35
36#define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \
37({ \
38 ktime_t __start = ktime_get(); \
39 type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \
40 s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \
41 struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \
42 if (!__retval && __elapsed > __td->field) { \
43 __td->field = __elapsed; \
44 dev_dbg(dev, name " latency exceeded, new value %lld ns\n", \
45 __elapsed); \
46 genpd->max_off_time_changed = true; \
47 __td->constraint_changed = true; \
48 } \
49 __retval; \
50})
51
52static LIST_HEAD(gpd_list);
53static DEFINE_MUTEX(gpd_list_lock);
54
55static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name)
56{
57 struct generic_pm_domain *genpd = NULL, *gpd;
58
59 if (IS_ERR_OR_NULL(domain_name))
60 return NULL;
61
62 mutex_lock(&gpd_list_lock);
63 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
64 if (!strcmp(gpd->name, domain_name)) {
65 genpd = gpd;
66 break;
67 }
68 }
69 mutex_unlock(&gpd_list_lock);
70 return genpd;
71}
72
73#ifdef CONFIG_PM
74
75struct generic_pm_domain *dev_to_genpd(struct device *dev)
76{
77 if (IS_ERR_OR_NULL(dev->pm_domain))
78 return ERR_PTR(-EINVAL);
79
80 return pd_to_genpd(dev->pm_domain);
81}
82
83static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev)
84{
85 return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev,
86 stop_latency_ns, "stop");
87}
88
89static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev)
90{
91 return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev,
92 start_latency_ns, "start");
93}
94
95static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
96{
97 bool ret = false;
98
99 if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
100 ret = !!atomic_dec_and_test(&genpd->sd_count);
101
102 return ret;
103}
104
105static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
106{
107 atomic_inc(&genpd->sd_count);
108 smp_mb__after_atomic_inc();
109}
110
111static void genpd_acquire_lock(struct generic_pm_domain *genpd)
112{
113 DEFINE_WAIT(wait);
114
115 mutex_lock(&genpd->lock);
116 /*
117 * Wait for the domain to transition into either the active,
118 * or the power off state.
119 */
120 for (;;) {
121 prepare_to_wait(&genpd->status_wait_queue, &wait,
122 TASK_UNINTERRUPTIBLE);
123 if (genpd->status == GPD_STATE_ACTIVE
124 || genpd->status == GPD_STATE_POWER_OFF)
125 break;
126 mutex_unlock(&genpd->lock);
127
128 schedule();
129
130 mutex_lock(&genpd->lock);
131 }
132 finish_wait(&genpd->status_wait_queue, &wait);
133}
134
135static void genpd_release_lock(struct generic_pm_domain *genpd)
136{
137 mutex_unlock(&genpd->lock);
138}
139
140static void genpd_set_active(struct generic_pm_domain *genpd)
141{
142 if (genpd->resume_count == 0)
143 genpd->status = GPD_STATE_ACTIVE;
144}
145
146static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd)
147{
148 s64 usecs64;
149
150 if (!genpd->cpu_data)
151 return;
152
153 usecs64 = genpd->power_on_latency_ns;
154 do_div(usecs64, NSEC_PER_USEC);
155 usecs64 += genpd->cpu_data->saved_exit_latency;
156 genpd->cpu_data->idle_state->exit_latency = usecs64;
157}
158
159/**
160 * __pm_genpd_poweron - Restore power to a given PM domain and its masters.
161 * @genpd: PM domain to power up.
162 *
163 * Restore power to @genpd and all of its masters so that it is possible to
164 * resume a device belonging to it.
165 */
166static int __pm_genpd_poweron(struct generic_pm_domain *genpd)
167 __releases(&genpd->lock) __acquires(&genpd->lock)
168{
169 struct gpd_link *link;
170 DEFINE_WAIT(wait);
171 int ret = 0;
172
173 /* If the domain's master is being waited for, we have to wait too. */
174 for (;;) {
175 prepare_to_wait(&genpd->status_wait_queue, &wait,
176 TASK_UNINTERRUPTIBLE);
177 if (genpd->status != GPD_STATE_WAIT_MASTER)
178 break;
179 mutex_unlock(&genpd->lock);
180
181 schedule();
182
183 mutex_lock(&genpd->lock);
184 }
185 finish_wait(&genpd->status_wait_queue, &wait);
186
187 if (genpd->status == GPD_STATE_ACTIVE
188 || (genpd->prepared_count > 0 && genpd->suspend_power_off))
189 return 0;
190
191 if (genpd->status != GPD_STATE_POWER_OFF) {
192 genpd_set_active(genpd);
193 return 0;
194 }
195
196 if (genpd->cpu_data) {
197 cpuidle_pause_and_lock();
198 genpd->cpu_data->idle_state->disabled = true;
199 cpuidle_resume_and_unlock();
200 goto out;
201 }
202
203 /*
204 * The list is guaranteed not to change while the loop below is being
205 * executed, unless one of the masters' .power_on() callbacks fiddles
206 * with it.
207 */
208 list_for_each_entry(link, &genpd->slave_links, slave_node) {
209 genpd_sd_counter_inc(link->master);
210 genpd->status = GPD_STATE_WAIT_MASTER;
211
212 mutex_unlock(&genpd->lock);
213
214 ret = pm_genpd_poweron(link->master);
215
216 mutex_lock(&genpd->lock);
217
218 /*
219 * The "wait for parent" status is guaranteed not to change
220 * while the master is powering on.
221 */
222 genpd->status = GPD_STATE_POWER_OFF;
223 wake_up_all(&genpd->status_wait_queue);
224 if (ret) {
225 genpd_sd_counter_dec(link->master);
226 goto err;
227 }
228 }
229
230 if (genpd->power_on) {
231 ktime_t time_start = ktime_get();
232 s64 elapsed_ns;
233
234 ret = genpd->power_on(genpd);
235 if (ret)
236 goto err;
237
238 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
239 if (elapsed_ns > genpd->power_on_latency_ns) {
240 genpd->power_on_latency_ns = elapsed_ns;
241 genpd->max_off_time_changed = true;
242 genpd_recalc_cpu_exit_latency(genpd);
243 if (genpd->name)
244 pr_warning("%s: Power-on latency exceeded, "
245 "new value %lld ns\n", genpd->name,
246 elapsed_ns);
247 }
248 }
249
250 out:
251 genpd_set_active(genpd);
252
253 return 0;
254
255 err:
256 list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node)
257 genpd_sd_counter_dec(link->master);
258
259 return ret;
260}
261
262/**
263 * pm_genpd_poweron - Restore power to a given PM domain and its masters.
264 * @genpd: PM domain to power up.
265 */
266int pm_genpd_poweron(struct generic_pm_domain *genpd)
267{
268 int ret;
269
270 mutex_lock(&genpd->lock);
271 ret = __pm_genpd_poweron(genpd);
272 mutex_unlock(&genpd->lock);
273 return ret;
274}
275
276/**
277 * pm_genpd_name_poweron - Restore power to a given PM domain and its masters.
278 * @domain_name: Name of the PM domain to power up.
279 */
280int pm_genpd_name_poweron(const char *domain_name)
281{
282 struct generic_pm_domain *genpd;
283
284 genpd = pm_genpd_lookup_name(domain_name);
285 return genpd ? pm_genpd_poweron(genpd) : -EINVAL;
286}
287
288#endif /* CONFIG_PM */
289
290#ifdef CONFIG_PM_RUNTIME
291
292static int genpd_start_dev_no_timing(struct generic_pm_domain *genpd,
293 struct device *dev)
294{
295 return GENPD_DEV_CALLBACK(genpd, int, start, dev);
296}
297
298static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev)
299{
300 return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev,
301 save_state_latency_ns, "state save");
302}
303
304static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev)
305{
306 return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev,
307 restore_state_latency_ns,
308 "state restore");
309}
310
311static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
312 unsigned long val, void *ptr)
313{
314 struct generic_pm_domain_data *gpd_data;
315 struct device *dev;
316
317 gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
318
319 mutex_lock(&gpd_data->lock);
320 dev = gpd_data->base.dev;
321 if (!dev) {
322 mutex_unlock(&gpd_data->lock);
323 return NOTIFY_DONE;
324 }
325 mutex_unlock(&gpd_data->lock);
326
327 for (;;) {
328 struct generic_pm_domain *genpd;
329 struct pm_domain_data *pdd;
330
331 spin_lock_irq(&dev->power.lock);
332
333 pdd = dev->power.subsys_data ?
334 dev->power.subsys_data->domain_data : NULL;
335 if (pdd && pdd->dev) {
336 to_gpd_data(pdd)->td.constraint_changed = true;
337 genpd = dev_to_genpd(dev);
338 } else {
339 genpd = ERR_PTR(-ENODATA);
340 }
341
342 spin_unlock_irq(&dev->power.lock);
343
344 if (!IS_ERR(genpd)) {
345 mutex_lock(&genpd->lock);
346 genpd->max_off_time_changed = true;
347 mutex_unlock(&genpd->lock);
348 }
349
350 dev = dev->parent;
351 if (!dev || dev->power.ignore_children)
352 break;
353 }
354
355 return NOTIFY_DONE;
356}
357
358/**
359 * __pm_genpd_save_device - Save the pre-suspend state of a device.
360 * @pdd: Domain data of the device to save the state of.
361 * @genpd: PM domain the device belongs to.
362 */
363static int __pm_genpd_save_device(struct pm_domain_data *pdd,
364 struct generic_pm_domain *genpd)
365 __releases(&genpd->lock) __acquires(&genpd->lock)
366{
367 struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
368 struct device *dev = pdd->dev;
369 int ret = 0;
370
371 if (gpd_data->need_restore)
372 return 0;
373
374 mutex_unlock(&genpd->lock);
375
376 genpd_start_dev(genpd, dev);
377 ret = genpd_save_dev(genpd, dev);
378 genpd_stop_dev(genpd, dev);
379
380 mutex_lock(&genpd->lock);
381
382 if (!ret)
383 gpd_data->need_restore = true;
384
385 return ret;
386}
387
388/**
389 * __pm_genpd_restore_device - Restore the pre-suspend state of a device.
390 * @pdd: Domain data of the device to restore the state of.
391 * @genpd: PM domain the device belongs to.
392 */
393static void __pm_genpd_restore_device(struct pm_domain_data *pdd,
394 struct generic_pm_domain *genpd)
395 __releases(&genpd->lock) __acquires(&genpd->lock)
396{
397 struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd);
398 struct device *dev = pdd->dev;
399 bool need_restore = gpd_data->need_restore;
400
401 gpd_data->need_restore = false;
402 mutex_unlock(&genpd->lock);
403
404 genpd_start_dev(genpd, dev);
405 if (need_restore)
406 genpd_restore_dev(genpd, dev);
407
408 mutex_lock(&genpd->lock);
409}
410
411/**
412 * genpd_abort_poweroff - Check if a PM domain power off should be aborted.
413 * @genpd: PM domain to check.
414 *
415 * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during
416 * a "power off" operation, which means that a "power on" has occured in the
417 * meantime, or if its resume_count field is different from zero, which means
418 * that one of its devices has been resumed in the meantime.
419 */
420static bool genpd_abort_poweroff(struct generic_pm_domain *genpd)
421{
422 return genpd->status == GPD_STATE_WAIT_MASTER
423 || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0;
424}
425
426/**
427 * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff().
428 * @genpd: PM domait to power off.
429 *
430 * Queue up the execution of pm_genpd_poweroff() unless it's already been done
431 * before.
432 */
433void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
434{
435 queue_work(pm_wq, &genpd->power_off_work);
436}
437
438/**
439 * pm_genpd_poweroff - Remove power from a given PM domain.
440 * @genpd: PM domain to power down.
441 *
442 * If all of the @genpd's devices have been suspended and all of its subdomains
443 * have been powered down, run the runtime suspend callbacks provided by all of
444 * the @genpd's devices' drivers and remove power from @genpd.
445 */
446static int pm_genpd_poweroff(struct generic_pm_domain *genpd)
447 __releases(&genpd->lock) __acquires(&genpd->lock)
448{
449 struct pm_domain_data *pdd;
450 struct gpd_link *link;
451 unsigned int not_suspended;
452 int ret = 0;
453
454 start:
455 /*
456 * Do not try to power off the domain in the following situations:
457 * (1) The domain is already in the "power off" state.
458 * (2) The domain is waiting for its master to power up.
459 * (3) One of the domain's devices is being resumed right now.
460 * (4) System suspend is in progress.
461 */
462 if (genpd->status == GPD_STATE_POWER_OFF
463 || genpd->status == GPD_STATE_WAIT_MASTER
464 || genpd->resume_count > 0 || genpd->prepared_count > 0)
465 return 0;
466
467 if (atomic_read(&genpd->sd_count) > 0)
468 return -EBUSY;
469
470 not_suspended = 0;
471 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
472 enum pm_qos_flags_status stat;
473
474 stat = dev_pm_qos_flags(pdd->dev,
475 PM_QOS_FLAG_NO_POWER_OFF
476 | PM_QOS_FLAG_REMOTE_WAKEUP);
477 if (stat > PM_QOS_FLAGS_NONE)
478 return -EBUSY;
479
480 if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev)
481 || pdd->dev->power.irq_safe))
482 not_suspended++;
483 }
484
485 if (not_suspended > genpd->in_progress)
486 return -EBUSY;
487
488 if (genpd->poweroff_task) {
489 /*
490 * Another instance of pm_genpd_poweroff() is executing
491 * callbacks, so tell it to start over and return.
492 */
493 genpd->status = GPD_STATE_REPEAT;
494 return 0;
495 }
496
497 if (genpd->gov && genpd->gov->power_down_ok) {
498 if (!genpd->gov->power_down_ok(&genpd->domain))
499 return -EAGAIN;
500 }
501
502 genpd->status = GPD_STATE_BUSY;
503 genpd->poweroff_task = current;
504
505 list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) {
506 ret = atomic_read(&genpd->sd_count) == 0 ?
507 __pm_genpd_save_device(pdd, genpd) : -EBUSY;
508
509 if (genpd_abort_poweroff(genpd))
510 goto out;
511
512 if (ret) {
513 genpd_set_active(genpd);
514 goto out;
515 }
516
517 if (genpd->status == GPD_STATE_REPEAT) {
518 genpd->poweroff_task = NULL;
519 goto start;
520 }
521 }
522
523 if (genpd->cpu_data) {
524 /*
525 * If cpu_data is set, cpuidle should turn the domain off when
526 * the CPU in it is idle. In that case we don't decrement the
527 * subdomain counts of the master domains, so that power is not
528 * removed from the current domain prematurely as a result of
529 * cutting off the masters' power.
530 */
531 genpd->status = GPD_STATE_POWER_OFF;
532 cpuidle_pause_and_lock();
533 genpd->cpu_data->idle_state->disabled = false;
534 cpuidle_resume_and_unlock();
535 goto out;
536 }
537
538 if (genpd->power_off) {
539 ktime_t time_start;
540 s64 elapsed_ns;
541
542 if (atomic_read(&genpd->sd_count) > 0) {
543 ret = -EBUSY;
544 goto out;
545 }
546
547 time_start = ktime_get();
548
549 /*
550 * If sd_count > 0 at this point, one of the subdomains hasn't
551 * managed to call pm_genpd_poweron() for the master yet after
552 * incrementing it. In that case pm_genpd_poweron() will wait
553 * for us to drop the lock, so we can call .power_off() and let
554 * the pm_genpd_poweron() restore power for us (this shouldn't
555 * happen very often).
556 */
557 ret = genpd->power_off(genpd);
558 if (ret == -EBUSY) {
559 genpd_set_active(genpd);
560 goto out;
561 }
562
563 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
564 if (elapsed_ns > genpd->power_off_latency_ns) {
565 genpd->power_off_latency_ns = elapsed_ns;
566 genpd->max_off_time_changed = true;
567 if (genpd->name)
568 pr_warning("%s: Power-off latency exceeded, "
569 "new value %lld ns\n", genpd->name,
570 elapsed_ns);
571 }
572 }
573
574 genpd->status = GPD_STATE_POWER_OFF;
575
576 list_for_each_entry(link, &genpd->slave_links, slave_node) {
577 genpd_sd_counter_dec(link->master);
578 genpd_queue_power_off_work(link->master);
579 }
580
581 out:
582 genpd->poweroff_task = NULL;
583 wake_up_all(&genpd->status_wait_queue);
584 return ret;
585}
586
587/**
588 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
589 * @work: Work structure used for scheduling the execution of this function.
590 */
591static void genpd_power_off_work_fn(struct work_struct *work)
592{
593 struct generic_pm_domain *genpd;
594
595 genpd = container_of(work, struct generic_pm_domain, power_off_work);
596
597 genpd_acquire_lock(genpd);
598 pm_genpd_poweroff(genpd);
599 genpd_release_lock(genpd);
600}
601
602/**
603 * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
604 * @dev: Device to suspend.
605 *
606 * Carry out a runtime suspend of a device under the assumption that its
607 * pm_domain field points to the domain member of an object of type
608 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
609 */
610static int pm_genpd_runtime_suspend(struct device *dev)
611{
612 struct generic_pm_domain *genpd;
613 bool (*stop_ok)(struct device *__dev);
614 int ret;
615
616 dev_dbg(dev, "%s()\n", __func__);
617
618 genpd = dev_to_genpd(dev);
619 if (IS_ERR(genpd))
620 return -EINVAL;
621
622 might_sleep_if(!genpd->dev_irq_safe);
623
624 stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL;
625 if (stop_ok && !stop_ok(dev))
626 return -EBUSY;
627
628 ret = genpd_stop_dev(genpd, dev);
629 if (ret)
630 return ret;
631
632 /*
633 * If power.irq_safe is set, this routine will be run with interrupts
634 * off, so it can't use mutexes.
635 */
636 if (dev->power.irq_safe)
637 return 0;
638
639 mutex_lock(&genpd->lock);
640 genpd->in_progress++;
641 pm_genpd_poweroff(genpd);
642 genpd->in_progress--;
643 mutex_unlock(&genpd->lock);
644
645 return 0;
646}
647
648/**
649 * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain.
650 * @dev: Device to resume.
651 *
652 * Carry out a runtime resume of a device under the assumption that its
653 * pm_domain field points to the domain member of an object of type
654 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
655 */
656static int pm_genpd_runtime_resume(struct device *dev)
657{
658 struct generic_pm_domain *genpd;
659 DEFINE_WAIT(wait);
660 int ret;
661
662 dev_dbg(dev, "%s()\n", __func__);
663
664 genpd = dev_to_genpd(dev);
665 if (IS_ERR(genpd))
666 return -EINVAL;
667
668 might_sleep_if(!genpd->dev_irq_safe);
669
670 /* If power.irq_safe, the PM domain is never powered off. */
671 if (dev->power.irq_safe)
672 return genpd_start_dev_no_timing(genpd, dev);
673
674 mutex_lock(&genpd->lock);
675 ret = __pm_genpd_poweron(genpd);
676 if (ret) {
677 mutex_unlock(&genpd->lock);
678 return ret;
679 }
680 genpd->status = GPD_STATE_BUSY;
681 genpd->resume_count++;
682 for (;;) {
683 prepare_to_wait(&genpd->status_wait_queue, &wait,
684 TASK_UNINTERRUPTIBLE);
685 /*
686 * If current is the powering off task, we have been called
687 * reentrantly from one of the device callbacks, so we should
688 * not wait.
689 */
690 if (!genpd->poweroff_task || genpd->poweroff_task == current)
691 break;
692 mutex_unlock(&genpd->lock);
693
694 schedule();
695
696 mutex_lock(&genpd->lock);
697 }
698 finish_wait(&genpd->status_wait_queue, &wait);
699 __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd);
700 genpd->resume_count--;
701 genpd_set_active(genpd);
702 wake_up_all(&genpd->status_wait_queue);
703 mutex_unlock(&genpd->lock);
704
705 return 0;
706}
707
708static bool pd_ignore_unused;
709static int __init pd_ignore_unused_setup(char *__unused)
710{
711 pd_ignore_unused = true;
712 return 1;
713}
714__setup("pd_ignore_unused", pd_ignore_unused_setup);
715
716/**
717 * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use.
718 */
719void pm_genpd_poweroff_unused(void)
720{
721 struct generic_pm_domain *genpd;
722
723 if (pd_ignore_unused) {
724 pr_warn("genpd: Not disabling unused power domains\n");
725 return;
726 }
727
728 mutex_lock(&gpd_list_lock);
729
730 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
731 genpd_queue_power_off_work(genpd);
732
733 mutex_unlock(&gpd_list_lock);
734}
735
736#else
737
738static inline int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
739 unsigned long val, void *ptr)
740{
741 return NOTIFY_DONE;
742}
743
744static inline void genpd_power_off_work_fn(struct work_struct *work) {}
745
746#define pm_genpd_runtime_suspend NULL
747#define pm_genpd_runtime_resume NULL
748
749#endif /* CONFIG_PM_RUNTIME */
750
751#ifdef CONFIG_PM_SLEEP
752
753/**
754 * pm_genpd_present - Check if the given PM domain has been initialized.
755 * @genpd: PM domain to check.
756 */
757static bool pm_genpd_present(struct generic_pm_domain *genpd)
758{
759 struct generic_pm_domain *gpd;
760
761 if (IS_ERR_OR_NULL(genpd))
762 return false;
763
764 list_for_each_entry(gpd, &gpd_list, gpd_list_node)
765 if (gpd == genpd)
766 return true;
767
768 return false;
769}
770
771static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd,
772 struct device *dev)
773{
774 return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev);
775}
776
777static int genpd_suspend_dev(struct generic_pm_domain *genpd, struct device *dev)
778{
779 return GENPD_DEV_CALLBACK(genpd, int, suspend, dev);
780}
781
782static int genpd_suspend_late(struct generic_pm_domain *genpd, struct device *dev)
783{
784 return GENPD_DEV_CALLBACK(genpd, int, suspend_late, dev);
785}
786
787static int genpd_resume_early(struct generic_pm_domain *genpd, struct device *dev)
788{
789 return GENPD_DEV_CALLBACK(genpd, int, resume_early, dev);
790}
791
792static int genpd_resume_dev(struct generic_pm_domain *genpd, struct device *dev)
793{
794 return GENPD_DEV_CALLBACK(genpd, int, resume, dev);
795}
796
797static int genpd_freeze_dev(struct generic_pm_domain *genpd, struct device *dev)
798{
799 return GENPD_DEV_CALLBACK(genpd, int, freeze, dev);
800}
801
802static int genpd_freeze_late(struct generic_pm_domain *genpd, struct device *dev)
803{
804 return GENPD_DEV_CALLBACK(genpd, int, freeze_late, dev);
805}
806
807static int genpd_thaw_early(struct generic_pm_domain *genpd, struct device *dev)
808{
809 return GENPD_DEV_CALLBACK(genpd, int, thaw_early, dev);
810}
811
812static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev)
813{
814 return GENPD_DEV_CALLBACK(genpd, int, thaw, dev);
815}
816
817/**
818 * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters.
819 * @genpd: PM domain to power off, if possible.
820 *
821 * Check if the given PM domain can be powered off (during system suspend or
822 * hibernation) and do that if so. Also, in that case propagate to its masters.
823 *
824 * This function is only called in "noirq" and "syscore" stages of system power
825 * transitions, so it need not acquire locks (all of the "noirq" callbacks are
826 * executed sequentially, so it is guaranteed that it will never run twice in
827 * parallel).
828 */
829static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd)
830{
831 struct gpd_link *link;
832
833 if (genpd->status == GPD_STATE_POWER_OFF)
834 return;
835
836 if (genpd->suspended_count != genpd->device_count
837 || atomic_read(&genpd->sd_count) > 0)
838 return;
839
840 if (genpd->power_off)
841 genpd->power_off(genpd);
842
843 genpd->status = GPD_STATE_POWER_OFF;
844
845 list_for_each_entry(link, &genpd->slave_links, slave_node) {
846 genpd_sd_counter_dec(link->master);
847 pm_genpd_sync_poweroff(link->master);
848 }
849}
850
851/**
852 * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters.
853 * @genpd: PM domain to power on.
854 *
855 * This function is only called in "noirq" and "syscore" stages of system power
856 * transitions, so it need not acquire locks (all of the "noirq" callbacks are
857 * executed sequentially, so it is guaranteed that it will never run twice in
858 * parallel).
859 */
860static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd)
861{
862 struct gpd_link *link;
863
864 if (genpd->status != GPD_STATE_POWER_OFF)
865 return;
866
867 list_for_each_entry(link, &genpd->slave_links, slave_node) {
868 pm_genpd_sync_poweron(link->master);
869 genpd_sd_counter_inc(link->master);
870 }
871
872 if (genpd->power_on)
873 genpd->power_on(genpd);
874
875 genpd->status = GPD_STATE_ACTIVE;
876}
877
878/**
879 * resume_needed - Check whether to resume a device before system suspend.
880 * @dev: Device to check.
881 * @genpd: PM domain the device belongs to.
882 *
883 * There are two cases in which a device that can wake up the system from sleep
884 * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled
885 * to wake up the system and it has to remain active for this purpose while the
886 * system is in the sleep state and (2) if the device is not enabled to wake up
887 * the system from sleep states and it generally doesn't generate wakeup signals
888 * by itself (those signals are generated on its behalf by other parts of the
889 * system). In the latter case it may be necessary to reconfigure the device's
890 * wakeup settings during system suspend, because it may have been set up to
891 * signal remote wakeup from the system's working state as needed by runtime PM.
892 * Return 'true' in either of the above cases.
893 */
894static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd)
895{
896 bool active_wakeup;
897
898 if (!device_can_wakeup(dev))
899 return false;
900
901 active_wakeup = genpd_dev_active_wakeup(genpd, dev);
902 return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
903}
904
905/**
906 * pm_genpd_prepare - Start power transition of a device in a PM domain.
907 * @dev: Device to start the transition of.
908 *
909 * Start a power transition of a device (during a system-wide power transition)
910 * under the assumption that its pm_domain field points to the domain member of
911 * an object of type struct generic_pm_domain representing a PM domain
912 * consisting of I/O devices.
913 */
914static int pm_genpd_prepare(struct device *dev)
915{
916 struct generic_pm_domain *genpd;
917 int ret;
918
919 dev_dbg(dev, "%s()\n", __func__);
920
921 genpd = dev_to_genpd(dev);
922 if (IS_ERR(genpd))
923 return -EINVAL;
924
925 /*
926 * If a wakeup request is pending for the device, it should be woken up
927 * at this point and a system wakeup event should be reported if it's
928 * set up to wake up the system from sleep states.
929 */
930 pm_runtime_get_noresume(dev);
931 if (pm_runtime_barrier(dev) && device_may_wakeup(dev))
932 pm_wakeup_event(dev, 0);
933
934 if (pm_wakeup_pending()) {
935 pm_runtime_put(dev);
936 return -EBUSY;
937 }
938
939 if (resume_needed(dev, genpd))
940 pm_runtime_resume(dev);
941
942 genpd_acquire_lock(genpd);
943
944 if (genpd->prepared_count++ == 0) {
945 genpd->suspended_count = 0;
946 genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF;
947 }
948
949 genpd_release_lock(genpd);
950
951 if (genpd->suspend_power_off) {
952 pm_runtime_put_noidle(dev);
953 return 0;
954 }
955
956 /*
957 * The PM domain must be in the GPD_STATE_ACTIVE state at this point,
958 * so pm_genpd_poweron() will return immediately, but if the device
959 * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need
960 * to make it operational.
961 */
962 pm_runtime_resume(dev);
963 __pm_runtime_disable(dev, false);
964
965 ret = pm_generic_prepare(dev);
966 if (ret) {
967 mutex_lock(&genpd->lock);
968
969 if (--genpd->prepared_count == 0)
970 genpd->suspend_power_off = false;
971
972 mutex_unlock(&genpd->lock);
973 pm_runtime_enable(dev);
974 }
975
976 pm_runtime_put(dev);
977 return ret;
978}
979
980/**
981 * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain.
982 * @dev: Device to suspend.
983 *
984 * Suspend a device under the assumption that its pm_domain field points to the
985 * domain member of an object of type struct generic_pm_domain representing
986 * a PM domain consisting of I/O devices.
987 */
988static int pm_genpd_suspend(struct device *dev)
989{
990 struct generic_pm_domain *genpd;
991
992 dev_dbg(dev, "%s()\n", __func__);
993
994 genpd = dev_to_genpd(dev);
995 if (IS_ERR(genpd))
996 return -EINVAL;
997
998 return genpd->suspend_power_off ? 0 : genpd_suspend_dev(genpd, dev);
999}
1000
1001/**
1002 * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain.
1003 * @dev: Device to suspend.
1004 *
1005 * Carry out a late suspend of a device under the assumption that its
1006 * pm_domain field points to the domain member of an object of type
1007 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
1008 */
1009static int pm_genpd_suspend_late(struct device *dev)
1010{
1011 struct generic_pm_domain *genpd;
1012
1013 dev_dbg(dev, "%s()\n", __func__);
1014
1015 genpd = dev_to_genpd(dev);
1016 if (IS_ERR(genpd))
1017 return -EINVAL;
1018
1019 return genpd->suspend_power_off ? 0 : genpd_suspend_late(genpd, dev);
1020}
1021
1022/**
1023 * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
1024 * @dev: Device to suspend.
1025 *
1026 * Stop the device and remove power from the domain if all devices in it have
1027 * been stopped.
1028 */
1029static int pm_genpd_suspend_noirq(struct device *dev)
1030{
1031 struct generic_pm_domain *genpd;
1032
1033 dev_dbg(dev, "%s()\n", __func__);
1034
1035 genpd = dev_to_genpd(dev);
1036 if (IS_ERR(genpd))
1037 return -EINVAL;
1038
1039 if (genpd->suspend_power_off
1040 || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
1041 return 0;
1042
1043 genpd_stop_dev(genpd, dev);
1044
1045 /*
1046 * Since all of the "noirq" callbacks are executed sequentially, it is
1047 * guaranteed that this function will never run twice in parallel for
1048 * the same PM domain, so it is not necessary to use locking here.
1049 */
1050 genpd->suspended_count++;
1051 pm_genpd_sync_poweroff(genpd);
1052
1053 return 0;
1054}
1055
1056/**
1057 * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain.
1058 * @dev: Device to resume.
1059 *
1060 * Restore power to the device's PM domain, if necessary, and start the device.
1061 */
1062static int pm_genpd_resume_noirq(struct device *dev)
1063{
1064 struct generic_pm_domain *genpd;
1065
1066 dev_dbg(dev, "%s()\n", __func__);
1067
1068 genpd = dev_to_genpd(dev);
1069 if (IS_ERR(genpd))
1070 return -EINVAL;
1071
1072 if (genpd->suspend_power_off
1073 || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev)))
1074 return 0;
1075
1076 /*
1077 * Since all of the "noirq" callbacks are executed sequentially, it is
1078 * guaranteed that this function will never run twice in parallel for
1079 * the same PM domain, so it is not necessary to use locking here.
1080 */
1081 pm_genpd_sync_poweron(genpd);
1082 genpd->suspended_count--;
1083
1084 return genpd_start_dev(genpd, dev);
1085}
1086
1087/**
1088 * pm_genpd_resume_early - Early resume of a device in an I/O PM domain.
1089 * @dev: Device to resume.
1090 *
1091 * Carry out an early resume of a device under the assumption that its
1092 * pm_domain field points to the domain member of an object of type
1093 * struct generic_pm_domain representing a power domain consisting of I/O
1094 * devices.
1095 */
1096static int pm_genpd_resume_early(struct device *dev)
1097{
1098 struct generic_pm_domain *genpd;
1099
1100 dev_dbg(dev, "%s()\n", __func__);
1101
1102 genpd = dev_to_genpd(dev);
1103 if (IS_ERR(genpd))
1104 return -EINVAL;
1105
1106 return genpd->suspend_power_off ? 0 : genpd_resume_early(genpd, dev);
1107}
1108
1109/**
1110 * pm_genpd_resume - Resume of device in an I/O PM domain.
1111 * @dev: Device to resume.
1112 *
1113 * Resume a device under the assumption that its pm_domain field points to the
1114 * domain member of an object of type struct generic_pm_domain representing
1115 * a power domain consisting of I/O devices.
1116 */
1117static int pm_genpd_resume(struct device *dev)
1118{
1119 struct generic_pm_domain *genpd;
1120
1121 dev_dbg(dev, "%s()\n", __func__);
1122
1123 genpd = dev_to_genpd(dev);
1124 if (IS_ERR(genpd))
1125 return -EINVAL;
1126
1127 return genpd->suspend_power_off ? 0 : genpd_resume_dev(genpd, dev);
1128}
1129
1130/**
1131 * pm_genpd_freeze - Freezing a device in an I/O PM domain.
1132 * @dev: Device to freeze.
1133 *
1134 * Freeze a device under the assumption that its pm_domain field points to the
1135 * domain member of an object of type struct generic_pm_domain representing
1136 * a power domain consisting of I/O devices.
1137 */
1138static int pm_genpd_freeze(struct device *dev)
1139{
1140 struct generic_pm_domain *genpd;
1141
1142 dev_dbg(dev, "%s()\n", __func__);
1143
1144 genpd = dev_to_genpd(dev);
1145 if (IS_ERR(genpd))
1146 return -EINVAL;
1147
1148 return genpd->suspend_power_off ? 0 : genpd_freeze_dev(genpd, dev);
1149}
1150
1151/**
1152 * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain.
1153 * @dev: Device to freeze.
1154 *
1155 * Carry out a late freeze of a device under the assumption that its
1156 * pm_domain field points to the domain member of an object of type
1157 * struct generic_pm_domain representing a power domain consisting of I/O
1158 * devices.
1159 */
1160static int pm_genpd_freeze_late(struct device *dev)
1161{
1162 struct generic_pm_domain *genpd;
1163
1164 dev_dbg(dev, "%s()\n", __func__);
1165
1166 genpd = dev_to_genpd(dev);
1167 if (IS_ERR(genpd))
1168 return -EINVAL;
1169
1170 return genpd->suspend_power_off ? 0 : genpd_freeze_late(genpd, dev);
1171}
1172
1173/**
1174 * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
1175 * @dev: Device to freeze.
1176 *
1177 * Carry out a late freeze of a device under the assumption that its
1178 * pm_domain field points to the domain member of an object of type
1179 * struct generic_pm_domain representing a power domain consisting of I/O
1180 * devices.
1181 */
1182static int pm_genpd_freeze_noirq(struct device *dev)
1183{
1184 struct generic_pm_domain *genpd;
1185
1186 dev_dbg(dev, "%s()\n", __func__);
1187
1188 genpd = dev_to_genpd(dev);
1189 if (IS_ERR(genpd))
1190 return -EINVAL;
1191
1192 return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev);
1193}
1194
1195/**
1196 * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
1197 * @dev: Device to thaw.
1198 *
1199 * Start the device, unless power has been removed from the domain already
1200 * before the system transition.
1201 */
1202static int pm_genpd_thaw_noirq(struct device *dev)
1203{
1204 struct generic_pm_domain *genpd;
1205
1206 dev_dbg(dev, "%s()\n", __func__);
1207
1208 genpd = dev_to_genpd(dev);
1209 if (IS_ERR(genpd))
1210 return -EINVAL;
1211
1212 return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev);
1213}
1214
1215/**
1216 * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain.
1217 * @dev: Device to thaw.
1218 *
1219 * Carry out an early thaw of a device under the assumption that its
1220 * pm_domain field points to the domain member of an object of type
1221 * struct generic_pm_domain representing a power domain consisting of I/O
1222 * devices.
1223 */
1224static int pm_genpd_thaw_early(struct device *dev)
1225{
1226 struct generic_pm_domain *genpd;
1227
1228 dev_dbg(dev, "%s()\n", __func__);
1229
1230 genpd = dev_to_genpd(dev);
1231 if (IS_ERR(genpd))
1232 return -EINVAL;
1233
1234 return genpd->suspend_power_off ? 0 : genpd_thaw_early(genpd, dev);
1235}
1236
1237/**
1238 * pm_genpd_thaw - Thaw a device belonging to an I/O power domain.
1239 * @dev: Device to thaw.
1240 *
1241 * Thaw a device under the assumption that its pm_domain field points to the
1242 * domain member of an object of type struct generic_pm_domain representing
1243 * a power domain consisting of I/O devices.
1244 */
1245static int pm_genpd_thaw(struct device *dev)
1246{
1247 struct generic_pm_domain *genpd;
1248
1249 dev_dbg(dev, "%s()\n", __func__);
1250
1251 genpd = dev_to_genpd(dev);
1252 if (IS_ERR(genpd))
1253 return -EINVAL;
1254
1255 return genpd->suspend_power_off ? 0 : genpd_thaw_dev(genpd, dev);
1256}
1257
1258/**
1259 * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain.
1260 * @dev: Device to resume.
1261 *
1262 * Make sure the domain will be in the same power state as before the
1263 * hibernation the system is resuming from and start the device if necessary.
1264 */
1265static int pm_genpd_restore_noirq(struct device *dev)
1266{
1267 struct generic_pm_domain *genpd;
1268
1269 dev_dbg(dev, "%s()\n", __func__);
1270
1271 genpd = dev_to_genpd(dev);
1272 if (IS_ERR(genpd))
1273 return -EINVAL;
1274
1275 /*
1276 * Since all of the "noirq" callbacks are executed sequentially, it is
1277 * guaranteed that this function will never run twice in parallel for
1278 * the same PM domain, so it is not necessary to use locking here.
1279 *
1280 * At this point suspended_count == 0 means we are being run for the
1281 * first time for the given domain in the present cycle.
1282 */
1283 if (genpd->suspended_count++ == 0) {
1284 /*
1285 * The boot kernel might put the domain into arbitrary state,
1286 * so make it appear as powered off to pm_genpd_sync_poweron(),
1287 * so that it tries to power it on in case it was really off.
1288 */
1289 genpd->status = GPD_STATE_POWER_OFF;
1290 if (genpd->suspend_power_off) {
1291 /*
1292 * If the domain was off before the hibernation, make
1293 * sure it will be off going forward.
1294 */
1295 if (genpd->power_off)
1296 genpd->power_off(genpd);
1297
1298 return 0;
1299 }
1300 }
1301
1302 if (genpd->suspend_power_off)
1303 return 0;
1304
1305 pm_genpd_sync_poweron(genpd);
1306
1307 return genpd_start_dev(genpd, dev);
1308}
1309
1310/**
1311 * pm_genpd_complete - Complete power transition of a device in a power domain.
1312 * @dev: Device to complete the transition of.
1313 *
1314 * Complete a power transition of a device (during a system-wide power
1315 * transition) under the assumption that its pm_domain field points to the
1316 * domain member of an object of type struct generic_pm_domain representing
1317 * a power domain consisting of I/O devices.
1318 */
1319static void pm_genpd_complete(struct device *dev)
1320{
1321 struct generic_pm_domain *genpd;
1322 bool run_complete;
1323
1324 dev_dbg(dev, "%s()\n", __func__);
1325
1326 genpd = dev_to_genpd(dev);
1327 if (IS_ERR(genpd))
1328 return;
1329
1330 mutex_lock(&genpd->lock);
1331
1332 run_complete = !genpd->suspend_power_off;
1333 if (--genpd->prepared_count == 0)
1334 genpd->suspend_power_off = false;
1335
1336 mutex_unlock(&genpd->lock);
1337
1338 if (run_complete) {
1339 pm_generic_complete(dev);
1340 pm_runtime_set_active(dev);
1341 pm_runtime_enable(dev);
1342 pm_request_idle(dev);
1343 }
1344}
1345
1346/**
1347 * pm_genpd_syscore_switch - Switch power during system core suspend or resume.
1348 * @dev: Device that normally is marked as "always on" to switch power for.
1349 *
1350 * This routine may only be called during the system core (syscore) suspend or
1351 * resume phase for devices whose "always on" flags are set.
1352 */
1353void pm_genpd_syscore_switch(struct device *dev, bool suspend)
1354{
1355 struct generic_pm_domain *genpd;
1356
1357 genpd = dev_to_genpd(dev);
1358 if (!pm_genpd_present(genpd))
1359 return;
1360
1361 if (suspend) {
1362 genpd->suspended_count++;
1363 pm_genpd_sync_poweroff(genpd);
1364 } else {
1365 pm_genpd_sync_poweron(genpd);
1366 genpd->suspended_count--;
1367 }
1368}
1369EXPORT_SYMBOL_GPL(pm_genpd_syscore_switch);
1370
1371#else
1372
1373#define pm_genpd_prepare NULL
1374#define pm_genpd_suspend NULL
1375#define pm_genpd_suspend_late NULL
1376#define pm_genpd_suspend_noirq NULL
1377#define pm_genpd_resume_early NULL
1378#define pm_genpd_resume_noirq NULL
1379#define pm_genpd_resume NULL
1380#define pm_genpd_freeze NULL
1381#define pm_genpd_freeze_late NULL
1382#define pm_genpd_freeze_noirq NULL
1383#define pm_genpd_thaw_early NULL
1384#define pm_genpd_thaw_noirq NULL
1385#define pm_genpd_thaw NULL
1386#define pm_genpd_restore_noirq NULL
1387#define pm_genpd_complete NULL
1388
1389#endif /* CONFIG_PM_SLEEP */
1390
1391static struct generic_pm_domain_data *__pm_genpd_alloc_dev_data(struct device *dev)
1392{
1393 struct generic_pm_domain_data *gpd_data;
1394
1395 gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
1396 if (!gpd_data)
1397 return NULL;
1398
1399 mutex_init(&gpd_data->lock);
1400 gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
1401 dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1402 return gpd_data;
1403}
1404
1405static void __pm_genpd_free_dev_data(struct device *dev,
1406 struct generic_pm_domain_data *gpd_data)
1407{
1408 dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
1409 kfree(gpd_data);
1410}
1411
1412/**
1413 * __pm_genpd_add_device - Add a device to an I/O PM domain.
1414 * @genpd: PM domain to add the device to.
1415 * @dev: Device to be added.
1416 * @td: Set of PM QoS timing parameters to attach to the device.
1417 */
1418int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
1419 struct gpd_timing_data *td)
1420{
1421 struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL;
1422 struct pm_domain_data *pdd;
1423 int ret = 0;
1424
1425 dev_dbg(dev, "%s()\n", __func__);
1426
1427 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
1428 return -EINVAL;
1429
1430 gpd_data_new = __pm_genpd_alloc_dev_data(dev);
1431 if (!gpd_data_new)
1432 return -ENOMEM;
1433
1434 genpd_acquire_lock(genpd);
1435
1436 if (genpd->prepared_count > 0) {
1437 ret = -EAGAIN;
1438 goto out;
1439 }
1440
1441 list_for_each_entry(pdd, &genpd->dev_list, list_node)
1442 if (pdd->dev == dev) {
1443 ret = -EINVAL;
1444 goto out;
1445 }
1446
1447 ret = dev_pm_get_subsys_data(dev);
1448 if (ret)
1449 goto out;
1450
1451 genpd->device_count++;
1452 genpd->max_off_time_changed = true;
1453
1454 spin_lock_irq(&dev->power.lock);
1455
1456 dev->pm_domain = &genpd->domain;
1457 if (dev->power.subsys_data->domain_data) {
1458 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
1459 } else {
1460 gpd_data = gpd_data_new;
1461 dev->power.subsys_data->domain_data = &gpd_data->base;
1462 }
1463 gpd_data->refcount++;
1464 if (td)
1465 gpd_data->td = *td;
1466
1467 spin_unlock_irq(&dev->power.lock);
1468
1469 mutex_lock(&gpd_data->lock);
1470 gpd_data->base.dev = dev;
1471 list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
1472 gpd_data->need_restore = genpd->status == GPD_STATE_POWER_OFF;
1473 gpd_data->td.constraint_changed = true;
1474 gpd_data->td.effective_constraint_ns = -1;
1475 mutex_unlock(&gpd_data->lock);
1476
1477 out:
1478 genpd_release_lock(genpd);
1479
1480 if (gpd_data != gpd_data_new)
1481 __pm_genpd_free_dev_data(dev, gpd_data_new);
1482
1483 return ret;
1484}
1485
1486/**
1487 * __pm_genpd_of_add_device - Add a device to an I/O PM domain.
1488 * @genpd_node: Device tree node pointer representing a PM domain to which the
1489 * the device is added to.
1490 * @dev: Device to be added.
1491 * @td: Set of PM QoS timing parameters to attach to the device.
1492 */
1493int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev,
1494 struct gpd_timing_data *td)
1495{
1496 struct generic_pm_domain *genpd = NULL, *gpd;
1497
1498 dev_dbg(dev, "%s()\n", __func__);
1499
1500 if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev))
1501 return -EINVAL;
1502
1503 mutex_lock(&gpd_list_lock);
1504 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
1505 if (gpd->of_node == genpd_node) {
1506 genpd = gpd;
1507 break;
1508 }
1509 }
1510 mutex_unlock(&gpd_list_lock);
1511
1512 if (!genpd)
1513 return -EINVAL;
1514
1515 return __pm_genpd_add_device(genpd, dev, td);
1516}
1517
1518
1519/**
1520 * __pm_genpd_name_add_device - Find I/O PM domain and add a device to it.
1521 * @domain_name: Name of the PM domain to add the device to.
1522 * @dev: Device to be added.
1523 * @td: Set of PM QoS timing parameters to attach to the device.
1524 */
1525int __pm_genpd_name_add_device(const char *domain_name, struct device *dev,
1526 struct gpd_timing_data *td)
1527{
1528 return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td);
1529}
1530
1531/**
1532 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
1533 * @genpd: PM domain to remove the device from.
1534 * @dev: Device to be removed.
1535 */
1536int pm_genpd_remove_device(struct generic_pm_domain *genpd,
1537 struct device *dev)
1538{
1539 struct generic_pm_domain_data *gpd_data;
1540 struct pm_domain_data *pdd;
1541 bool remove = false;
1542 int ret = 0;
1543
1544 dev_dbg(dev, "%s()\n", __func__);
1545
1546 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)
1547 || IS_ERR_OR_NULL(dev->pm_domain)
1548 || pd_to_genpd(dev->pm_domain) != genpd)
1549 return -EINVAL;
1550
1551 genpd_acquire_lock(genpd);
1552
1553 if (genpd->prepared_count > 0) {
1554 ret = -EAGAIN;
1555 goto out;
1556 }
1557
1558 genpd->device_count--;
1559 genpd->max_off_time_changed = true;
1560
1561 spin_lock_irq(&dev->power.lock);
1562
1563 dev->pm_domain = NULL;
1564 pdd = dev->power.subsys_data->domain_data;
1565 list_del_init(&pdd->list_node);
1566 gpd_data = to_gpd_data(pdd);
1567 if (--gpd_data->refcount == 0) {
1568 dev->power.subsys_data->domain_data = NULL;
1569 remove = true;
1570 }
1571
1572 spin_unlock_irq(&dev->power.lock);
1573
1574 mutex_lock(&gpd_data->lock);
1575 pdd->dev = NULL;
1576 mutex_unlock(&gpd_data->lock);
1577
1578 genpd_release_lock(genpd);
1579
1580 dev_pm_put_subsys_data(dev);
1581 if (remove)
1582 __pm_genpd_free_dev_data(dev, gpd_data);
1583
1584 return 0;
1585
1586 out:
1587 genpd_release_lock(genpd);
1588
1589 return ret;
1590}
1591
1592/**
1593 * pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag.
1594 * @dev: Device to set/unset the flag for.
1595 * @val: The new value of the device's "need restore" flag.
1596 */
1597void pm_genpd_dev_need_restore(struct device *dev, bool val)
1598{
1599 struct pm_subsys_data *psd;
1600 unsigned long flags;
1601
1602 spin_lock_irqsave(&dev->power.lock, flags);
1603
1604 psd = dev_to_psd(dev);
1605 if (psd && psd->domain_data)
1606 to_gpd_data(psd->domain_data)->need_restore = val;
1607
1608 spin_unlock_irqrestore(&dev->power.lock, flags);
1609}
1610EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore);
1611
1612/**
1613 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
1614 * @genpd: Master PM domain to add the subdomain to.
1615 * @subdomain: Subdomain to be added.
1616 */
1617int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
1618 struct generic_pm_domain *subdomain)
1619{
1620 struct gpd_link *link;
1621 int ret = 0;
1622
1623 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
1624 || genpd == subdomain)
1625 return -EINVAL;
1626
1627 start:
1628 genpd_acquire_lock(genpd);
1629 mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
1630
1631 if (subdomain->status != GPD_STATE_POWER_OFF
1632 && subdomain->status != GPD_STATE_ACTIVE) {
1633 mutex_unlock(&subdomain->lock);
1634 genpd_release_lock(genpd);
1635 goto start;
1636 }
1637
1638 if (genpd->status == GPD_STATE_POWER_OFF
1639 && subdomain->status != GPD_STATE_POWER_OFF) {
1640 ret = -EINVAL;
1641 goto out;
1642 }
1643
1644 list_for_each_entry(link, &genpd->master_links, master_node) {
1645 if (link->slave == subdomain && link->master == genpd) {
1646 ret = -EINVAL;
1647 goto out;
1648 }
1649 }
1650
1651 link = kzalloc(sizeof(*link), GFP_KERNEL);
1652 if (!link) {
1653 ret = -ENOMEM;
1654 goto out;
1655 }
1656 link->master = genpd;
1657 list_add_tail(&link->master_node, &genpd->master_links);
1658 link->slave = subdomain;
1659 list_add_tail(&link->slave_node, &subdomain->slave_links);
1660 if (subdomain->status != GPD_STATE_POWER_OFF)
1661 genpd_sd_counter_inc(genpd);
1662
1663 out:
1664 mutex_unlock(&subdomain->lock);
1665 genpd_release_lock(genpd);
1666
1667 return ret;
1668}
1669
1670/**
1671 * pm_genpd_add_subdomain_names - Add a subdomain to an I/O PM domain.
1672 * @master_name: Name of the master PM domain to add the subdomain to.
1673 * @subdomain_name: Name of the subdomain to be added.
1674 */
1675int pm_genpd_add_subdomain_names(const char *master_name,
1676 const char *subdomain_name)
1677{
1678 struct generic_pm_domain *master = NULL, *subdomain = NULL, *gpd;
1679
1680 if (IS_ERR_OR_NULL(master_name) || IS_ERR_OR_NULL(subdomain_name))
1681 return -EINVAL;
1682
1683 mutex_lock(&gpd_list_lock);
1684 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
1685 if (!master && !strcmp(gpd->name, master_name))
1686 master = gpd;
1687
1688 if (!subdomain && !strcmp(gpd->name, subdomain_name))
1689 subdomain = gpd;
1690
1691 if (master && subdomain)
1692 break;
1693 }
1694 mutex_unlock(&gpd_list_lock);
1695
1696 return pm_genpd_add_subdomain(master, subdomain);
1697}
1698
1699/**
1700 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
1701 * @genpd: Master PM domain to remove the subdomain from.
1702 * @subdomain: Subdomain to be removed.
1703 */
1704int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
1705 struct generic_pm_domain *subdomain)
1706{
1707 struct gpd_link *link;
1708 int ret = -EINVAL;
1709
1710 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
1711 return -EINVAL;
1712
1713 start:
1714 genpd_acquire_lock(genpd);
1715
1716 list_for_each_entry(link, &genpd->master_links, master_node) {
1717 if (link->slave != subdomain)
1718 continue;
1719
1720 mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING);
1721
1722 if (subdomain->status != GPD_STATE_POWER_OFF
1723 && subdomain->status != GPD_STATE_ACTIVE) {
1724 mutex_unlock(&subdomain->lock);
1725 genpd_release_lock(genpd);
1726 goto start;
1727 }
1728
1729 list_del(&link->master_node);
1730 list_del(&link->slave_node);
1731 kfree(link);
1732 if (subdomain->status != GPD_STATE_POWER_OFF)
1733 genpd_sd_counter_dec(genpd);
1734
1735 mutex_unlock(&subdomain->lock);
1736
1737 ret = 0;
1738 break;
1739 }
1740
1741 genpd_release_lock(genpd);
1742
1743 return ret;
1744}
1745
1746/**
1747 * pm_genpd_add_callbacks - Add PM domain callbacks to a given device.
1748 * @dev: Device to add the callbacks to.
1749 * @ops: Set of callbacks to add.
1750 * @td: Timing data to add to the device along with the callbacks (optional).
1751 *
1752 * Every call to this routine should be balanced with a call to
1753 * __pm_genpd_remove_callbacks() and they must not be nested.
1754 */
1755int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops,
1756 struct gpd_timing_data *td)
1757{
1758 struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL;
1759 int ret = 0;
1760
1761 if (!(dev && ops))
1762 return -EINVAL;
1763
1764 gpd_data_new = __pm_genpd_alloc_dev_data(dev);
1765 if (!gpd_data_new)
1766 return -ENOMEM;
1767
1768 pm_runtime_disable(dev);
1769 device_pm_lock();
1770
1771 ret = dev_pm_get_subsys_data(dev);
1772 if (ret)
1773 goto out;
1774
1775 spin_lock_irq(&dev->power.lock);
1776
1777 if (dev->power.subsys_data->domain_data) {
1778 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
1779 } else {
1780 gpd_data = gpd_data_new;
1781 dev->power.subsys_data->domain_data = &gpd_data->base;
1782 }
1783 gpd_data->refcount++;
1784 gpd_data->ops = *ops;
1785 if (td)
1786 gpd_data->td = *td;
1787
1788 spin_unlock_irq(&dev->power.lock);
1789
1790 out:
1791 device_pm_unlock();
1792 pm_runtime_enable(dev);
1793
1794 if (gpd_data != gpd_data_new)
1795 __pm_genpd_free_dev_data(dev, gpd_data_new);
1796
1797 return ret;
1798}
1799EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks);
1800
1801/**
1802 * __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device.
1803 * @dev: Device to remove the callbacks from.
1804 * @clear_td: If set, clear the device's timing data too.
1805 *
1806 * This routine can only be called after pm_genpd_add_callbacks().
1807 */
1808int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td)
1809{
1810 struct generic_pm_domain_data *gpd_data = NULL;
1811 bool remove = false;
1812 int ret = 0;
1813
1814 if (!(dev && dev->power.subsys_data))
1815 return -EINVAL;
1816
1817 pm_runtime_disable(dev);
1818 device_pm_lock();
1819
1820 spin_lock_irq(&dev->power.lock);
1821
1822 if (dev->power.subsys_data->domain_data) {
1823 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
1824 gpd_data->ops = (struct gpd_dev_ops){ NULL };
1825 if (clear_td)
1826 gpd_data->td = (struct gpd_timing_data){ 0 };
1827
1828 if (--gpd_data->refcount == 0) {
1829 dev->power.subsys_data->domain_data = NULL;
1830 remove = true;
1831 }
1832 } else {
1833 ret = -EINVAL;
1834 }
1835
1836 spin_unlock_irq(&dev->power.lock);
1837
1838 device_pm_unlock();
1839 pm_runtime_enable(dev);
1840
1841 if (ret)
1842 return ret;
1843
1844 dev_pm_put_subsys_data(dev);
1845 if (remove)
1846 __pm_genpd_free_dev_data(dev, gpd_data);
1847
1848 return 0;
1849}
1850EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks);
1851
1852/**
1853 * pm_genpd_attach_cpuidle - Connect the given PM domain with cpuidle.
1854 * @genpd: PM domain to be connected with cpuidle.
1855 * @state: cpuidle state this domain can disable/enable.
1856 *
1857 * Make a PM domain behave as though it contained a CPU core, that is, instead
1858 * of calling its power down routine it will enable the given cpuidle state so
1859 * that the cpuidle subsystem can power it down (if possible and desirable).
1860 */
1861int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state)
1862{
1863 struct cpuidle_driver *cpuidle_drv;
1864 struct gpd_cpu_data *cpu_data;
1865 struct cpuidle_state *idle_state;
1866 int ret = 0;
1867
1868 if (IS_ERR_OR_NULL(genpd) || state < 0)
1869 return -EINVAL;
1870
1871 genpd_acquire_lock(genpd);
1872
1873 if (genpd->cpu_data) {
1874 ret = -EEXIST;
1875 goto out;
1876 }
1877 cpu_data = kzalloc(sizeof(*cpu_data), GFP_KERNEL);
1878 if (!cpu_data) {
1879 ret = -ENOMEM;
1880 goto out;
1881 }
1882 cpuidle_drv = cpuidle_driver_ref();
1883 if (!cpuidle_drv) {
1884 ret = -ENODEV;
1885 goto err_drv;
1886 }
1887 if (cpuidle_drv->state_count <= state) {
1888 ret = -EINVAL;
1889 goto err;
1890 }
1891 idle_state = &cpuidle_drv->states[state];
1892 if (!idle_state->disabled) {
1893 ret = -EAGAIN;
1894 goto err;
1895 }
1896 cpu_data->idle_state = idle_state;
1897 cpu_data->saved_exit_latency = idle_state->exit_latency;
1898 genpd->cpu_data = cpu_data;
1899 genpd_recalc_cpu_exit_latency(genpd);
1900
1901 out:
1902 genpd_release_lock(genpd);
1903 return ret;
1904
1905 err:
1906 cpuidle_driver_unref();
1907
1908 err_drv:
1909 kfree(cpu_data);
1910 goto out;
1911}
1912
1913/**
1914 * pm_genpd_name_attach_cpuidle - Find PM domain and connect cpuidle to it.
1915 * @name: Name of the domain to connect to cpuidle.
1916 * @state: cpuidle state this domain can manipulate.
1917 */
1918int pm_genpd_name_attach_cpuidle(const char *name, int state)
1919{
1920 return pm_genpd_attach_cpuidle(pm_genpd_lookup_name(name), state);
1921}
1922
1923/**
1924 * pm_genpd_detach_cpuidle - Remove the cpuidle connection from a PM domain.
1925 * @genpd: PM domain to remove the cpuidle connection from.
1926 *
1927 * Remove the cpuidle connection set up by pm_genpd_attach_cpuidle() from the
1928 * given PM domain.
1929 */
1930int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd)
1931{
1932 struct gpd_cpu_data *cpu_data;
1933 struct cpuidle_state *idle_state;
1934 int ret = 0;
1935
1936 if (IS_ERR_OR_NULL(genpd))
1937 return -EINVAL;
1938
1939 genpd_acquire_lock(genpd);
1940
1941 cpu_data = genpd->cpu_data;
1942 if (!cpu_data) {
1943 ret = -ENODEV;
1944 goto out;
1945 }
1946 idle_state = cpu_data->idle_state;
1947 if (!idle_state->disabled) {
1948 ret = -EAGAIN;
1949 goto out;
1950 }
1951 idle_state->exit_latency = cpu_data->saved_exit_latency;
1952 cpuidle_driver_unref();
1953 genpd->cpu_data = NULL;
1954 kfree(cpu_data);
1955
1956 out:
1957 genpd_release_lock(genpd);
1958 return ret;
1959}
1960
1961/**
1962 * pm_genpd_name_detach_cpuidle - Find PM domain and disconnect cpuidle from it.
1963 * @name: Name of the domain to disconnect cpuidle from.
1964 */
1965int pm_genpd_name_detach_cpuidle(const char *name)
1966{
1967 return pm_genpd_detach_cpuidle(pm_genpd_lookup_name(name));
1968}
1969
1970/* Default device callbacks for generic PM domains. */
1971
1972/**
1973 * pm_genpd_default_save_state - Default "save device state" for PM domians.
1974 * @dev: Device to handle.
1975 */
1976static int pm_genpd_default_save_state(struct device *dev)
1977{
1978 int (*cb)(struct device *__dev);
1979
1980 cb = dev_gpd_data(dev)->ops.save_state;
1981 if (cb)
1982 return cb(dev);
1983
1984 if (dev->type && dev->type->pm)
1985 cb = dev->type->pm->runtime_suspend;
1986 else if (dev->class && dev->class->pm)
1987 cb = dev->class->pm->runtime_suspend;
1988 else if (dev->bus && dev->bus->pm)
1989 cb = dev->bus->pm->runtime_suspend;
1990 else
1991 cb = NULL;
1992
1993 if (!cb && dev->driver && dev->driver->pm)
1994 cb = dev->driver->pm->runtime_suspend;
1995
1996 return cb ? cb(dev) : 0;
1997}
1998
1999/**
2000 * pm_genpd_default_restore_state - Default PM domians "restore device state".
2001 * @dev: Device to handle.
2002 */
2003static int pm_genpd_default_restore_state(struct device *dev)
2004{
2005 int (*cb)(struct device *__dev);
2006
2007 cb = dev_gpd_data(dev)->ops.restore_state;
2008 if (cb)
2009 return cb(dev);
2010
2011 if (dev->type && dev->type->pm)
2012 cb = dev->type->pm->runtime_resume;
2013 else if (dev->class && dev->class->pm)
2014 cb = dev->class->pm->runtime_resume;
2015 else if (dev->bus && dev->bus->pm)
2016 cb = dev->bus->pm->runtime_resume;
2017 else
2018 cb = NULL;
2019
2020 if (!cb && dev->driver && dev->driver->pm)
2021 cb = dev->driver->pm->runtime_resume;
2022
2023 return cb ? cb(dev) : 0;
2024}
2025
2026#ifdef CONFIG_PM_SLEEP
2027
2028/**
2029 * pm_genpd_default_suspend - Default "device suspend" for PM domians.
2030 * @dev: Device to handle.
2031 */
2032static int pm_genpd_default_suspend(struct device *dev)
2033{
2034 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend;
2035
2036 return cb ? cb(dev) : pm_generic_suspend(dev);
2037}
2038
2039/**
2040 * pm_genpd_default_suspend_late - Default "late device suspend" for PM domians.
2041 * @dev: Device to handle.
2042 */
2043static int pm_genpd_default_suspend_late(struct device *dev)
2044{
2045 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend_late;
2046
2047 return cb ? cb(dev) : pm_generic_suspend_late(dev);
2048}
2049
2050/**
2051 * pm_genpd_default_resume_early - Default "early device resume" for PM domians.
2052 * @dev: Device to handle.
2053 */
2054static int pm_genpd_default_resume_early(struct device *dev)
2055{
2056 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume_early;
2057
2058 return cb ? cb(dev) : pm_generic_resume_early(dev);
2059}
2060
2061/**
2062 * pm_genpd_default_resume - Default "device resume" for PM domians.
2063 * @dev: Device to handle.
2064 */
2065static int pm_genpd_default_resume(struct device *dev)
2066{
2067 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume;
2068
2069 return cb ? cb(dev) : pm_generic_resume(dev);
2070}
2071
2072/**
2073 * pm_genpd_default_freeze - Default "device freeze" for PM domians.
2074 * @dev: Device to handle.
2075 */
2076static int pm_genpd_default_freeze(struct device *dev)
2077{
2078 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze;
2079
2080 return cb ? cb(dev) : pm_generic_freeze(dev);
2081}
2082
2083/**
2084 * pm_genpd_default_freeze_late - Default "late device freeze" for PM domians.
2085 * @dev: Device to handle.
2086 */
2087static int pm_genpd_default_freeze_late(struct device *dev)
2088{
2089 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late;
2090
2091 return cb ? cb(dev) : pm_generic_freeze_late(dev);
2092}
2093
2094/**
2095 * pm_genpd_default_thaw_early - Default "early device thaw" for PM domians.
2096 * @dev: Device to handle.
2097 */
2098static int pm_genpd_default_thaw_early(struct device *dev)
2099{
2100 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early;
2101
2102 return cb ? cb(dev) : pm_generic_thaw_early(dev);
2103}
2104
2105/**
2106 * pm_genpd_default_thaw - Default "device thaw" for PM domians.
2107 * @dev: Device to handle.
2108 */
2109static int pm_genpd_default_thaw(struct device *dev)
2110{
2111 int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw;
2112
2113 return cb ? cb(dev) : pm_generic_thaw(dev);
2114}
2115
2116#else /* !CONFIG_PM_SLEEP */
2117
2118#define pm_genpd_default_suspend NULL
2119#define pm_genpd_default_suspend_late NULL
2120#define pm_genpd_default_resume_early NULL
2121#define pm_genpd_default_resume NULL
2122#define pm_genpd_default_freeze NULL
2123#define pm_genpd_default_freeze_late NULL
2124#define pm_genpd_default_thaw_early NULL
2125#define pm_genpd_default_thaw NULL
2126
2127#endif /* !CONFIG_PM_SLEEP */
2128
2129/**
2130 * pm_genpd_init - Initialize a generic I/O PM domain object.
2131 * @genpd: PM domain object to initialize.
2132 * @gov: PM domain governor to associate with the domain (may be NULL).
2133 * @is_off: Initial value of the domain's power_is_off field.
2134 */
2135void pm_genpd_init(struct generic_pm_domain *genpd,
2136 struct dev_power_governor *gov, bool is_off)
2137{
2138 if (IS_ERR_OR_NULL(genpd))
2139 return;
2140
2141 INIT_LIST_HEAD(&genpd->master_links);
2142 INIT_LIST_HEAD(&genpd->slave_links);
2143 INIT_LIST_HEAD(&genpd->dev_list);
2144 mutex_init(&genpd->lock);
2145 genpd->gov = gov;
2146 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
2147 genpd->in_progress = 0;
2148 atomic_set(&genpd->sd_count, 0);
2149 genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
2150 init_waitqueue_head(&genpd->status_wait_queue);
2151 genpd->poweroff_task = NULL;
2152 genpd->resume_count = 0;
2153 genpd->device_count = 0;
2154 genpd->max_off_time_ns = -1;
2155 genpd->max_off_time_changed = true;
2156 genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend;
2157 genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume;
2158 genpd->domain.ops.prepare = pm_genpd_prepare;
2159 genpd->domain.ops.suspend = pm_genpd_suspend;
2160 genpd->domain.ops.suspend_late = pm_genpd_suspend_late;
2161 genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq;
2162 genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq;
2163 genpd->domain.ops.resume_early = pm_genpd_resume_early;
2164 genpd->domain.ops.resume = pm_genpd_resume;
2165 genpd->domain.ops.freeze = pm_genpd_freeze;
2166 genpd->domain.ops.freeze_late = pm_genpd_freeze_late;
2167 genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq;
2168 genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq;
2169 genpd->domain.ops.thaw_early = pm_genpd_thaw_early;
2170 genpd->domain.ops.thaw = pm_genpd_thaw;
2171 genpd->domain.ops.poweroff = pm_genpd_suspend;
2172 genpd->domain.ops.poweroff_late = pm_genpd_suspend_late;
2173 genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq;
2174 genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq;
2175 genpd->domain.ops.restore_early = pm_genpd_resume_early;
2176 genpd->domain.ops.restore = pm_genpd_resume;
2177 genpd->domain.ops.complete = pm_genpd_complete;
2178 genpd->dev_ops.save_state = pm_genpd_default_save_state;
2179 genpd->dev_ops.restore_state = pm_genpd_default_restore_state;
2180 genpd->dev_ops.suspend = pm_genpd_default_suspend;
2181 genpd->dev_ops.suspend_late = pm_genpd_default_suspend_late;
2182 genpd->dev_ops.resume_early = pm_genpd_default_resume_early;
2183 genpd->dev_ops.resume = pm_genpd_default_resume;
2184 genpd->dev_ops.freeze = pm_genpd_default_freeze;
2185 genpd->dev_ops.freeze_late = pm_genpd_default_freeze_late;
2186 genpd->dev_ops.thaw_early = pm_genpd_default_thaw_early;
2187 genpd->dev_ops.thaw = pm_genpd_default_thaw;
2188 mutex_lock(&gpd_list_lock);
2189 list_add(&genpd->gpd_list_node, &gpd_list);
2190 mutex_unlock(&gpd_list_lock);
2191}