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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#include <linux/debugfs.h>
25
26#include "power.h"
27
28#define GENPD_RETRY_MAX_MS 250 /* Approximate */
29
30#define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \
31({ \
32 type (*__routine)(struct device *__d); \
33 type __ret = (type)0; \
34 \
35 __routine = genpd->dev_ops.callback; \
36 if (__routine) { \
37 __ret = __routine(dev); \
38 } \
39 __ret; \
40})
41
42static LIST_HEAD(gpd_list);
43static DEFINE_MUTEX(gpd_list_lock);
44
45struct genpd_lock_ops {
46 void (*lock)(struct generic_pm_domain *genpd);
47 void (*lock_nested)(struct generic_pm_domain *genpd, int depth);
48 int (*lock_interruptible)(struct generic_pm_domain *genpd);
49 void (*unlock)(struct generic_pm_domain *genpd);
50};
51
52static void genpd_lock_mtx(struct generic_pm_domain *genpd)
53{
54 mutex_lock(&genpd->mlock);
55}
56
57static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd,
58 int depth)
59{
60 mutex_lock_nested(&genpd->mlock, depth);
61}
62
63static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd)
64{
65 return mutex_lock_interruptible(&genpd->mlock);
66}
67
68static void genpd_unlock_mtx(struct generic_pm_domain *genpd)
69{
70 return mutex_unlock(&genpd->mlock);
71}
72
73static const struct genpd_lock_ops genpd_mtx_ops = {
74 .lock = genpd_lock_mtx,
75 .lock_nested = genpd_lock_nested_mtx,
76 .lock_interruptible = genpd_lock_interruptible_mtx,
77 .unlock = genpd_unlock_mtx,
78};
79
80static void genpd_lock_spin(struct generic_pm_domain *genpd)
81 __acquires(&genpd->slock)
82{
83 unsigned long flags;
84
85 spin_lock_irqsave(&genpd->slock, flags);
86 genpd->lock_flags = flags;
87}
88
89static void genpd_lock_nested_spin(struct generic_pm_domain *genpd,
90 int depth)
91 __acquires(&genpd->slock)
92{
93 unsigned long flags;
94
95 spin_lock_irqsave_nested(&genpd->slock, flags, depth);
96 genpd->lock_flags = flags;
97}
98
99static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd)
100 __acquires(&genpd->slock)
101{
102 unsigned long flags;
103
104 spin_lock_irqsave(&genpd->slock, flags);
105 genpd->lock_flags = flags;
106 return 0;
107}
108
109static void genpd_unlock_spin(struct generic_pm_domain *genpd)
110 __releases(&genpd->slock)
111{
112 spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags);
113}
114
115static const struct genpd_lock_ops genpd_spin_ops = {
116 .lock = genpd_lock_spin,
117 .lock_nested = genpd_lock_nested_spin,
118 .lock_interruptible = genpd_lock_interruptible_spin,
119 .unlock = genpd_unlock_spin,
120};
121
122#define genpd_lock(p) p->lock_ops->lock(p)
123#define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d)
124#define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p)
125#define genpd_unlock(p) p->lock_ops->unlock(p)
126
127#define genpd_status_on(genpd) (genpd->status == GENPD_STATE_ON)
128#define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE)
129#define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON)
130#define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP)
131#define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN)
132#define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON)
133
134static inline bool irq_safe_dev_in_sleep_domain(struct device *dev,
135 const struct generic_pm_domain *genpd)
136{
137 bool ret;
138
139 ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd);
140
141 /*
142 * Warn once if an IRQ safe device is attached to a domain, which
143 * callbacks are allowed to sleep. This indicates a suboptimal
144 * configuration for PM, but it doesn't matter for an always on domain.
145 */
146 if (genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd))
147 return ret;
148
149 if (ret)
150 dev_warn_once(dev, "PM domain %s will not be powered off\n",
151 genpd->name);
152
153 return ret;
154}
155
156static int genpd_runtime_suspend(struct device *dev);
157
158/*
159 * Get the generic PM domain for a particular struct device.
160 * This validates the struct device pointer, the PM domain pointer,
161 * and checks that the PM domain pointer is a real generic PM domain.
162 * Any failure results in NULL being returned.
163 */
164static struct generic_pm_domain *dev_to_genpd_safe(struct device *dev)
165{
166 if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain))
167 return NULL;
168
169 /* A genpd's always have its ->runtime_suspend() callback assigned. */
170 if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend)
171 return pd_to_genpd(dev->pm_domain);
172
173 return NULL;
174}
175
176/*
177 * This should only be used where we are certain that the pm_domain
178 * attached to the device is a genpd domain.
179 */
180static struct generic_pm_domain *dev_to_genpd(struct device *dev)
181{
182 if (IS_ERR_OR_NULL(dev->pm_domain))
183 return ERR_PTR(-EINVAL);
184
185 return pd_to_genpd(dev->pm_domain);
186}
187
188static int genpd_stop_dev(const struct generic_pm_domain *genpd,
189 struct device *dev)
190{
191 return GENPD_DEV_CALLBACK(genpd, int, stop, dev);
192}
193
194static int genpd_start_dev(const struct generic_pm_domain *genpd,
195 struct device *dev)
196{
197 return GENPD_DEV_CALLBACK(genpd, int, start, dev);
198}
199
200static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
201{
202 bool ret = false;
203
204 if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
205 ret = !!atomic_dec_and_test(&genpd->sd_count);
206
207 return ret;
208}
209
210static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
211{
212 atomic_inc(&genpd->sd_count);
213 smp_mb__after_atomic();
214}
215
216#ifdef CONFIG_DEBUG_FS
217static struct dentry *genpd_debugfs_dir;
218
219static void genpd_debug_add(struct generic_pm_domain *genpd);
220
221static void genpd_debug_remove(struct generic_pm_domain *genpd)
222{
223 struct dentry *d;
224
225 if (!genpd_debugfs_dir)
226 return;
227
228 d = debugfs_lookup(genpd->name, genpd_debugfs_dir);
229 debugfs_remove(d);
230}
231
232static void genpd_update_accounting(struct generic_pm_domain *genpd)
233{
234 u64 delta, now;
235
236 now = ktime_get_mono_fast_ns();
237 if (now <= genpd->accounting_time)
238 return;
239
240 delta = now - genpd->accounting_time;
241
242 /*
243 * If genpd->status is active, it means we are just
244 * out of off and so update the idle time and vice
245 * versa.
246 */
247 if (genpd->status == GENPD_STATE_ON)
248 genpd->states[genpd->state_idx].idle_time += delta;
249 else
250 genpd->on_time += delta;
251
252 genpd->accounting_time = now;
253}
254#else
255static inline void genpd_debug_add(struct generic_pm_domain *genpd) {}
256static inline void genpd_debug_remove(struct generic_pm_domain *genpd) {}
257static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {}
258#endif
259
260static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd,
261 unsigned int state)
262{
263 struct generic_pm_domain_data *pd_data;
264 struct pm_domain_data *pdd;
265 struct gpd_link *link;
266
267 /* New requested state is same as Max requested state */
268 if (state == genpd->performance_state)
269 return state;
270
271 /* New requested state is higher than Max requested state */
272 if (state > genpd->performance_state)
273 return state;
274
275 /* Traverse all devices within the domain */
276 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
277 pd_data = to_gpd_data(pdd);
278
279 if (pd_data->performance_state > state)
280 state = pd_data->performance_state;
281 }
282
283 /*
284 * Traverse all sub-domains within the domain. This can be
285 * done without any additional locking as the link->performance_state
286 * field is protected by the parent genpd->lock, which is already taken.
287 *
288 * Also note that link->performance_state (subdomain's performance state
289 * requirement to parent domain) is different from
290 * link->child->performance_state (current performance state requirement
291 * of the devices/sub-domains of the subdomain) and so can have a
292 * different value.
293 *
294 * Note that we also take vote from powered-off sub-domains into account
295 * as the same is done for devices right now.
296 */
297 list_for_each_entry(link, &genpd->parent_links, parent_node) {
298 if (link->performance_state > state)
299 state = link->performance_state;
300 }
301
302 return state;
303}
304
305static int genpd_xlate_performance_state(struct generic_pm_domain *genpd,
306 struct generic_pm_domain *parent,
307 unsigned int pstate)
308{
309 if (!parent->set_performance_state)
310 return pstate;
311
312 return dev_pm_opp_xlate_performance_state(genpd->opp_table,
313 parent->opp_table,
314 pstate);
315}
316
317static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
318 unsigned int state, int depth)
319{
320 struct generic_pm_domain *parent;
321 struct gpd_link *link;
322 int parent_state, ret;
323
324 if (state == genpd->performance_state)
325 return 0;
326
327 /* Propagate to parents of genpd */
328 list_for_each_entry(link, &genpd->child_links, child_node) {
329 parent = link->parent;
330
331 /* Find parent's performance state */
332 ret = genpd_xlate_performance_state(genpd, parent, state);
333 if (unlikely(ret < 0))
334 goto err;
335
336 parent_state = ret;
337
338 genpd_lock_nested(parent, depth + 1);
339
340 link->prev_performance_state = link->performance_state;
341 link->performance_state = parent_state;
342 parent_state = _genpd_reeval_performance_state(parent,
343 parent_state);
344 ret = _genpd_set_performance_state(parent, parent_state, depth + 1);
345 if (ret)
346 link->performance_state = link->prev_performance_state;
347
348 genpd_unlock(parent);
349
350 if (ret)
351 goto err;
352 }
353
354 if (genpd->set_performance_state) {
355 ret = genpd->set_performance_state(genpd, state);
356 if (ret)
357 goto err;
358 }
359
360 genpd->performance_state = state;
361 return 0;
362
363err:
364 /* Encountered an error, lets rollback */
365 list_for_each_entry_continue_reverse(link, &genpd->child_links,
366 child_node) {
367 parent = link->parent;
368
369 genpd_lock_nested(parent, depth + 1);
370
371 parent_state = link->prev_performance_state;
372 link->performance_state = parent_state;
373
374 parent_state = _genpd_reeval_performance_state(parent,
375 parent_state);
376 if (_genpd_set_performance_state(parent, parent_state, depth + 1)) {
377 pr_err("%s: Failed to roll back to %d performance state\n",
378 parent->name, parent_state);
379 }
380
381 genpd_unlock(parent);
382 }
383
384 return ret;
385}
386
387static int genpd_set_performance_state(struct device *dev, unsigned int state)
388{
389 struct generic_pm_domain *genpd = dev_to_genpd(dev);
390 struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev);
391 unsigned int prev_state;
392 int ret;
393
394 prev_state = gpd_data->performance_state;
395 if (prev_state == state)
396 return 0;
397
398 gpd_data->performance_state = state;
399 state = _genpd_reeval_performance_state(genpd, state);
400
401 ret = _genpd_set_performance_state(genpd, state, 0);
402 if (ret)
403 gpd_data->performance_state = prev_state;
404
405 return ret;
406}
407
408static int genpd_drop_performance_state(struct device *dev)
409{
410 unsigned int prev_state = dev_gpd_data(dev)->performance_state;
411
412 if (!genpd_set_performance_state(dev, 0))
413 return prev_state;
414
415 return 0;
416}
417
418static void genpd_restore_performance_state(struct device *dev,
419 unsigned int state)
420{
421 if (state)
422 genpd_set_performance_state(dev, state);
423}
424
425/**
426 * dev_pm_genpd_set_performance_state- Set performance state of device's power
427 * domain.
428 *
429 * @dev: Device for which the performance-state needs to be set.
430 * @state: Target performance state of the device. This can be set as 0 when the
431 * device doesn't have any performance state constraints left (And so
432 * the device wouldn't participate anymore to find the target
433 * performance state of the genpd).
434 *
435 * It is assumed that the users guarantee that the genpd wouldn't be detached
436 * while this routine is getting called.
437 *
438 * Returns 0 on success and negative error values on failures.
439 */
440int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
441{
442 struct generic_pm_domain *genpd;
443 int ret = 0;
444
445 genpd = dev_to_genpd_safe(dev);
446 if (!genpd)
447 return -ENODEV;
448
449 if (WARN_ON(!dev->power.subsys_data ||
450 !dev->power.subsys_data->domain_data))
451 return -EINVAL;
452
453 genpd_lock(genpd);
454 if (pm_runtime_suspended(dev)) {
455 dev_gpd_data(dev)->rpm_pstate = state;
456 } else {
457 ret = genpd_set_performance_state(dev, state);
458 if (!ret)
459 dev_gpd_data(dev)->rpm_pstate = 0;
460 }
461 genpd_unlock(genpd);
462
463 return ret;
464}
465EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state);
466
467/**
468 * dev_pm_genpd_set_next_wakeup - Notify PM framework of an impending wakeup.
469 *
470 * @dev: Device to handle
471 * @next: impending interrupt/wakeup for the device
472 *
473 *
474 * Allow devices to inform of the next wakeup. It's assumed that the users
475 * guarantee that the genpd wouldn't be detached while this routine is getting
476 * called. Additionally, it's also assumed that @dev isn't runtime suspended
477 * (RPM_SUSPENDED)."
478 * Although devices are expected to update the next_wakeup after the end of
479 * their usecase as well, it is possible the devices themselves may not know
480 * about that, so stale @next will be ignored when powering off the domain.
481 */
482void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next)
483{
484 struct generic_pm_domain *genpd;
485 struct gpd_timing_data *td;
486
487 genpd = dev_to_genpd_safe(dev);
488 if (!genpd)
489 return;
490
491 td = to_gpd_data(dev->power.subsys_data->domain_data)->td;
492 if (td)
493 td->next_wakeup = next;
494}
495EXPORT_SYMBOL_GPL(dev_pm_genpd_set_next_wakeup);
496
497/**
498 * dev_pm_genpd_get_next_hrtimer - Return the next_hrtimer for the genpd
499 * @dev: A device that is attached to the genpd.
500 *
501 * This routine should typically be called for a device, at the point of when a
502 * GENPD_NOTIFY_PRE_OFF notification has been sent for it.
503 *
504 * Returns the aggregated value of the genpd's next hrtimer or KTIME_MAX if no
505 * valid value have been set.
506 */
507ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev)
508{
509 struct generic_pm_domain *genpd;
510
511 genpd = dev_to_genpd_safe(dev);
512 if (!genpd)
513 return KTIME_MAX;
514
515 if (genpd->gd)
516 return genpd->gd->next_hrtimer;
517
518 return KTIME_MAX;
519}
520EXPORT_SYMBOL_GPL(dev_pm_genpd_get_next_hrtimer);
521
522static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
523{
524 unsigned int state_idx = genpd->state_idx;
525 ktime_t time_start;
526 s64 elapsed_ns;
527 int ret;
528
529 /* Notify consumers that we are about to power on. */
530 ret = raw_notifier_call_chain_robust(&genpd->power_notifiers,
531 GENPD_NOTIFY_PRE_ON,
532 GENPD_NOTIFY_OFF, NULL);
533 ret = notifier_to_errno(ret);
534 if (ret)
535 return ret;
536
537 if (!genpd->power_on)
538 goto out;
539
540 timed = timed && genpd->gd && !genpd->states[state_idx].fwnode;
541 if (!timed) {
542 ret = genpd->power_on(genpd);
543 if (ret)
544 goto err;
545
546 goto out;
547 }
548
549 time_start = ktime_get();
550 ret = genpd->power_on(genpd);
551 if (ret)
552 goto err;
553
554 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
555 if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns)
556 goto out;
557
558 genpd->states[state_idx].power_on_latency_ns = elapsed_ns;
559 genpd->gd->max_off_time_changed = true;
560 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
561 genpd->name, "on", elapsed_ns);
562
563out:
564 raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL);
565 return 0;
566err:
567 raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF,
568 NULL);
569 return ret;
570}
571
572static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed)
573{
574 unsigned int state_idx = genpd->state_idx;
575 ktime_t time_start;
576 s64 elapsed_ns;
577 int ret;
578
579 /* Notify consumers that we are about to power off. */
580 ret = raw_notifier_call_chain_robust(&genpd->power_notifiers,
581 GENPD_NOTIFY_PRE_OFF,
582 GENPD_NOTIFY_ON, NULL);
583 ret = notifier_to_errno(ret);
584 if (ret)
585 return ret;
586
587 if (!genpd->power_off)
588 goto out;
589
590 timed = timed && genpd->gd && !genpd->states[state_idx].fwnode;
591 if (!timed) {
592 ret = genpd->power_off(genpd);
593 if (ret)
594 goto busy;
595
596 goto out;
597 }
598
599 time_start = ktime_get();
600 ret = genpd->power_off(genpd);
601 if (ret)
602 goto busy;
603
604 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
605 if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns)
606 goto out;
607
608 genpd->states[state_idx].power_off_latency_ns = elapsed_ns;
609 genpd->gd->max_off_time_changed = true;
610 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
611 genpd->name, "off", elapsed_ns);
612
613out:
614 raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF,
615 NULL);
616 return 0;
617busy:
618 raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL);
619 return ret;
620}
621
622/**
623 * genpd_queue_power_off_work - Queue up the execution of genpd_power_off().
624 * @genpd: PM domain to power off.
625 *
626 * Queue up the execution of genpd_power_off() unless it's already been done
627 * before.
628 */
629static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
630{
631 queue_work(pm_wq, &genpd->power_off_work);
632}
633
634/**
635 * genpd_power_off - Remove power from a given PM domain.
636 * @genpd: PM domain to power down.
637 * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the
638 * RPM status of the releated device is in an intermediate state, not yet turned
639 * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not
640 * be RPM_SUSPENDED, while it tries to power off the PM domain.
641 * @depth: nesting count for lockdep.
642 *
643 * If all of the @genpd's devices have been suspended and all of its subdomains
644 * have been powered down, remove power from @genpd.
645 */
646static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
647 unsigned int depth)
648{
649 struct pm_domain_data *pdd;
650 struct gpd_link *link;
651 unsigned int not_suspended = 0;
652 int ret;
653
654 /*
655 * Do not try to power off the domain in the following situations:
656 * (1) The domain is already in the "power off" state.
657 * (2) System suspend is in progress.
658 */
659 if (!genpd_status_on(genpd) || genpd->prepared_count > 0)
660 return 0;
661
662 /*
663 * Abort power off for the PM domain in the following situations:
664 * (1) The domain is configured as always on.
665 * (2) When the domain has a subdomain being powered on.
666 */
667 if (genpd_is_always_on(genpd) ||
668 genpd_is_rpm_always_on(genpd) ||
669 atomic_read(&genpd->sd_count) > 0)
670 return -EBUSY;
671
672 /*
673 * The children must be in their deepest (powered-off) states to allow
674 * the parent to be powered off. Note that, there's no need for
675 * additional locking, as powering on a child, requires the parent's
676 * lock to be acquired first.
677 */
678 list_for_each_entry(link, &genpd->parent_links, parent_node) {
679 struct generic_pm_domain *child = link->child;
680 if (child->state_idx < child->state_count - 1)
681 return -EBUSY;
682 }
683
684 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
685 /*
686 * Do not allow PM domain to be powered off, when an IRQ safe
687 * device is part of a non-IRQ safe domain.
688 */
689 if (!pm_runtime_suspended(pdd->dev) ||
690 irq_safe_dev_in_sleep_domain(pdd->dev, genpd))
691 not_suspended++;
692 }
693
694 if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on))
695 return -EBUSY;
696
697 if (genpd->gov && genpd->gov->power_down_ok) {
698 if (!genpd->gov->power_down_ok(&genpd->domain))
699 return -EAGAIN;
700 }
701
702 /* Default to shallowest state. */
703 if (!genpd->gov)
704 genpd->state_idx = 0;
705
706 /* Don't power off, if a child domain is waiting to power on. */
707 if (atomic_read(&genpd->sd_count) > 0)
708 return -EBUSY;
709
710 ret = _genpd_power_off(genpd, true);
711 if (ret) {
712 genpd->states[genpd->state_idx].rejected++;
713 return ret;
714 }
715
716 genpd->status = GENPD_STATE_OFF;
717 genpd_update_accounting(genpd);
718 genpd->states[genpd->state_idx].usage++;
719
720 list_for_each_entry(link, &genpd->child_links, child_node) {
721 genpd_sd_counter_dec(link->parent);
722 genpd_lock_nested(link->parent, depth + 1);
723 genpd_power_off(link->parent, false, depth + 1);
724 genpd_unlock(link->parent);
725 }
726
727 return 0;
728}
729
730/**
731 * genpd_power_on - Restore power to a given PM domain and its parents.
732 * @genpd: PM domain to power up.
733 * @depth: nesting count for lockdep.
734 *
735 * Restore power to @genpd and all of its parents so that it is possible to
736 * resume a device belonging to it.
737 */
738static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth)
739{
740 struct gpd_link *link;
741 int ret = 0;
742
743 if (genpd_status_on(genpd))
744 return 0;
745
746 /*
747 * The list is guaranteed not to change while the loop below is being
748 * executed, unless one of the parents' .power_on() callbacks fiddles
749 * with it.
750 */
751 list_for_each_entry(link, &genpd->child_links, child_node) {
752 struct generic_pm_domain *parent = link->parent;
753
754 genpd_sd_counter_inc(parent);
755
756 genpd_lock_nested(parent, depth + 1);
757 ret = genpd_power_on(parent, depth + 1);
758 genpd_unlock(parent);
759
760 if (ret) {
761 genpd_sd_counter_dec(parent);
762 goto err;
763 }
764 }
765
766 ret = _genpd_power_on(genpd, true);
767 if (ret)
768 goto err;
769
770 genpd->status = GENPD_STATE_ON;
771 genpd_update_accounting(genpd);
772
773 return 0;
774
775 err:
776 list_for_each_entry_continue_reverse(link,
777 &genpd->child_links,
778 child_node) {
779 genpd_sd_counter_dec(link->parent);
780 genpd_lock_nested(link->parent, depth + 1);
781 genpd_power_off(link->parent, false, depth + 1);
782 genpd_unlock(link->parent);
783 }
784
785 return ret;
786}
787
788static int genpd_dev_pm_start(struct device *dev)
789{
790 struct generic_pm_domain *genpd = dev_to_genpd(dev);
791
792 return genpd_start_dev(genpd, dev);
793}
794
795static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
796 unsigned long val, void *ptr)
797{
798 struct generic_pm_domain_data *gpd_data;
799 struct device *dev;
800
801 gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
802 dev = gpd_data->base.dev;
803
804 for (;;) {
805 struct generic_pm_domain *genpd = ERR_PTR(-ENODATA);
806 struct pm_domain_data *pdd;
807 struct gpd_timing_data *td;
808
809 spin_lock_irq(&dev->power.lock);
810
811 pdd = dev->power.subsys_data ?
812 dev->power.subsys_data->domain_data : NULL;
813 if (pdd) {
814 td = to_gpd_data(pdd)->td;
815 if (td) {
816 td->constraint_changed = true;
817 genpd = dev_to_genpd(dev);
818 }
819 }
820
821 spin_unlock_irq(&dev->power.lock);
822
823 if (!IS_ERR(genpd)) {
824 genpd_lock(genpd);
825 genpd->gd->max_off_time_changed = true;
826 genpd_unlock(genpd);
827 }
828
829 dev = dev->parent;
830 if (!dev || dev->power.ignore_children)
831 break;
832 }
833
834 return NOTIFY_DONE;
835}
836
837/**
838 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
839 * @work: Work structure used for scheduling the execution of this function.
840 */
841static void genpd_power_off_work_fn(struct work_struct *work)
842{
843 struct generic_pm_domain *genpd;
844
845 genpd = container_of(work, struct generic_pm_domain, power_off_work);
846
847 genpd_lock(genpd);
848 genpd_power_off(genpd, false, 0);
849 genpd_unlock(genpd);
850}
851
852/**
853 * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks
854 * @dev: Device to handle.
855 */
856static int __genpd_runtime_suspend(struct device *dev)
857{
858 int (*cb)(struct device *__dev);
859
860 if (dev->type && dev->type->pm)
861 cb = dev->type->pm->runtime_suspend;
862 else if (dev->class && dev->class->pm)
863 cb = dev->class->pm->runtime_suspend;
864 else if (dev->bus && dev->bus->pm)
865 cb = dev->bus->pm->runtime_suspend;
866 else
867 cb = NULL;
868
869 if (!cb && dev->driver && dev->driver->pm)
870 cb = dev->driver->pm->runtime_suspend;
871
872 return cb ? cb(dev) : 0;
873}
874
875/**
876 * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks
877 * @dev: Device to handle.
878 */
879static int __genpd_runtime_resume(struct device *dev)
880{
881 int (*cb)(struct device *__dev);
882
883 if (dev->type && dev->type->pm)
884 cb = dev->type->pm->runtime_resume;
885 else if (dev->class && dev->class->pm)
886 cb = dev->class->pm->runtime_resume;
887 else if (dev->bus && dev->bus->pm)
888 cb = dev->bus->pm->runtime_resume;
889 else
890 cb = NULL;
891
892 if (!cb && dev->driver && dev->driver->pm)
893 cb = dev->driver->pm->runtime_resume;
894
895 return cb ? cb(dev) : 0;
896}
897
898/**
899 * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
900 * @dev: Device to suspend.
901 *
902 * Carry out a runtime suspend of a device under the assumption that its
903 * pm_domain field points to the domain member of an object of type
904 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
905 */
906static int genpd_runtime_suspend(struct device *dev)
907{
908 struct generic_pm_domain *genpd;
909 bool (*suspend_ok)(struct device *__dev);
910 struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev);
911 struct gpd_timing_data *td = gpd_data->td;
912 bool runtime_pm = pm_runtime_enabled(dev);
913 ktime_t time_start = 0;
914 s64 elapsed_ns;
915 int ret;
916
917 dev_dbg(dev, "%s()\n", __func__);
918
919 genpd = dev_to_genpd(dev);
920 if (IS_ERR(genpd))
921 return -EINVAL;
922
923 /*
924 * A runtime PM centric subsystem/driver may re-use the runtime PM
925 * callbacks for other purposes than runtime PM. In those scenarios
926 * runtime PM is disabled. Under these circumstances, we shall skip
927 * validating/measuring the PM QoS latency.
928 */
929 suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL;
930 if (runtime_pm && suspend_ok && !suspend_ok(dev))
931 return -EBUSY;
932
933 /* Measure suspend latency. */
934 if (td && runtime_pm)
935 time_start = ktime_get();
936
937 ret = __genpd_runtime_suspend(dev);
938 if (ret)
939 return ret;
940
941 ret = genpd_stop_dev(genpd, dev);
942 if (ret) {
943 __genpd_runtime_resume(dev);
944 return ret;
945 }
946
947 /* Update suspend latency value if the measured time exceeds it. */
948 if (td && runtime_pm) {
949 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
950 if (elapsed_ns > td->suspend_latency_ns) {
951 td->suspend_latency_ns = elapsed_ns;
952 dev_dbg(dev, "suspend latency exceeded, %lld ns\n",
953 elapsed_ns);
954 genpd->gd->max_off_time_changed = true;
955 td->constraint_changed = true;
956 }
957 }
958
959 /*
960 * If power.irq_safe is set, this routine may be run with
961 * IRQs disabled, so suspend only if the PM domain also is irq_safe.
962 */
963 if (irq_safe_dev_in_sleep_domain(dev, genpd))
964 return 0;
965
966 genpd_lock(genpd);
967 genpd_power_off(genpd, true, 0);
968 gpd_data->rpm_pstate = genpd_drop_performance_state(dev);
969 genpd_unlock(genpd);
970
971 return 0;
972}
973
974/**
975 * genpd_runtime_resume - Resume a device belonging to I/O PM domain.
976 * @dev: Device to resume.
977 *
978 * Carry out a runtime resume of a device under the assumption that its
979 * pm_domain field points to the domain member of an object of type
980 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
981 */
982static int genpd_runtime_resume(struct device *dev)
983{
984 struct generic_pm_domain *genpd;
985 struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev);
986 struct gpd_timing_data *td = gpd_data->td;
987 bool timed = td && pm_runtime_enabled(dev);
988 ktime_t time_start = 0;
989 s64 elapsed_ns;
990 int ret;
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 /*
999 * As we don't power off a non IRQ safe domain, which holds
1000 * an IRQ safe device, we don't need to restore power to it.
1001 */
1002 if (irq_safe_dev_in_sleep_domain(dev, genpd))
1003 goto out;
1004
1005 genpd_lock(genpd);
1006 genpd_restore_performance_state(dev, gpd_data->rpm_pstate);
1007 ret = genpd_power_on(genpd, 0);
1008 genpd_unlock(genpd);
1009
1010 if (ret)
1011 return ret;
1012
1013 out:
1014 /* Measure resume latency. */
1015 if (timed)
1016 time_start = ktime_get();
1017
1018 ret = genpd_start_dev(genpd, dev);
1019 if (ret)
1020 goto err_poweroff;
1021
1022 ret = __genpd_runtime_resume(dev);
1023 if (ret)
1024 goto err_stop;
1025
1026 /* Update resume latency value if the measured time exceeds it. */
1027 if (timed) {
1028 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
1029 if (elapsed_ns > td->resume_latency_ns) {
1030 td->resume_latency_ns = elapsed_ns;
1031 dev_dbg(dev, "resume latency exceeded, %lld ns\n",
1032 elapsed_ns);
1033 genpd->gd->max_off_time_changed = true;
1034 td->constraint_changed = true;
1035 }
1036 }
1037
1038 return 0;
1039
1040err_stop:
1041 genpd_stop_dev(genpd, dev);
1042err_poweroff:
1043 if (!pm_runtime_is_irq_safe(dev) || genpd_is_irq_safe(genpd)) {
1044 genpd_lock(genpd);
1045 genpd_power_off(genpd, true, 0);
1046 gpd_data->rpm_pstate = genpd_drop_performance_state(dev);
1047 genpd_unlock(genpd);
1048 }
1049
1050 return ret;
1051}
1052
1053static bool pd_ignore_unused;
1054static int __init pd_ignore_unused_setup(char *__unused)
1055{
1056 pd_ignore_unused = true;
1057 return 1;
1058}
1059__setup("pd_ignore_unused", pd_ignore_unused_setup);
1060
1061/**
1062 * genpd_power_off_unused - Power off all PM domains with no devices in use.
1063 */
1064static int __init genpd_power_off_unused(void)
1065{
1066 struct generic_pm_domain *genpd;
1067
1068 if (pd_ignore_unused) {
1069 pr_warn("genpd: Not disabling unused power domains\n");
1070 return 0;
1071 }
1072
1073 mutex_lock(&gpd_list_lock);
1074
1075 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
1076 genpd_queue_power_off_work(genpd);
1077
1078 mutex_unlock(&gpd_list_lock);
1079
1080 return 0;
1081}
1082late_initcall(genpd_power_off_unused);
1083
1084#ifdef CONFIG_PM_SLEEP
1085
1086/**
1087 * genpd_sync_power_off - Synchronously power off a PM domain and its parents.
1088 * @genpd: PM domain to power off, if possible.
1089 * @use_lock: use the lock.
1090 * @depth: nesting count for lockdep.
1091 *
1092 * Check if the given PM domain can be powered off (during system suspend or
1093 * hibernation) and do that if so. Also, in that case propagate to its parents.
1094 *
1095 * This function is only called in "noirq" and "syscore" stages of system power
1096 * transitions. The "noirq" callbacks may be executed asynchronously, thus in
1097 * these cases the lock must be held.
1098 */
1099static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock,
1100 unsigned int depth)
1101{
1102 struct gpd_link *link;
1103
1104 if (!genpd_status_on(genpd) || genpd_is_always_on(genpd))
1105 return;
1106
1107 if (genpd->suspended_count != genpd->device_count
1108 || atomic_read(&genpd->sd_count) > 0)
1109 return;
1110
1111 /* Check that the children are in their deepest (powered-off) state. */
1112 list_for_each_entry(link, &genpd->parent_links, parent_node) {
1113 struct generic_pm_domain *child = link->child;
1114 if (child->state_idx < child->state_count - 1)
1115 return;
1116 }
1117
1118 /* Choose the deepest state when suspending */
1119 genpd->state_idx = genpd->state_count - 1;
1120 if (_genpd_power_off(genpd, false))
1121 return;
1122
1123 genpd->status = GENPD_STATE_OFF;
1124
1125 list_for_each_entry(link, &genpd->child_links, child_node) {
1126 genpd_sd_counter_dec(link->parent);
1127
1128 if (use_lock)
1129 genpd_lock_nested(link->parent, depth + 1);
1130
1131 genpd_sync_power_off(link->parent, use_lock, depth + 1);
1132
1133 if (use_lock)
1134 genpd_unlock(link->parent);
1135 }
1136}
1137
1138/**
1139 * genpd_sync_power_on - Synchronously power on a PM domain and its parents.
1140 * @genpd: PM domain to power on.
1141 * @use_lock: use the lock.
1142 * @depth: nesting count for lockdep.
1143 *
1144 * This function is only called in "noirq" and "syscore" stages of system power
1145 * transitions. The "noirq" callbacks may be executed asynchronously, thus in
1146 * these cases the lock must be held.
1147 */
1148static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock,
1149 unsigned int depth)
1150{
1151 struct gpd_link *link;
1152
1153 if (genpd_status_on(genpd))
1154 return;
1155
1156 list_for_each_entry(link, &genpd->child_links, child_node) {
1157 genpd_sd_counter_inc(link->parent);
1158
1159 if (use_lock)
1160 genpd_lock_nested(link->parent, depth + 1);
1161
1162 genpd_sync_power_on(link->parent, use_lock, depth + 1);
1163
1164 if (use_lock)
1165 genpd_unlock(link->parent);
1166 }
1167
1168 _genpd_power_on(genpd, false);
1169 genpd->status = GENPD_STATE_ON;
1170}
1171
1172/**
1173 * genpd_prepare - Start power transition of a device in a PM domain.
1174 * @dev: Device to start the transition of.
1175 *
1176 * Start a power transition of a device (during a system-wide power transition)
1177 * under the assumption that its pm_domain field points to the domain member of
1178 * an object of type struct generic_pm_domain representing a PM domain
1179 * consisting of I/O devices.
1180 */
1181static int genpd_prepare(struct device *dev)
1182{
1183 struct generic_pm_domain *genpd;
1184 int ret;
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 genpd_lock(genpd);
1193
1194 if (genpd->prepared_count++ == 0)
1195 genpd->suspended_count = 0;
1196
1197 genpd_unlock(genpd);
1198
1199 ret = pm_generic_prepare(dev);
1200 if (ret < 0) {
1201 genpd_lock(genpd);
1202
1203 genpd->prepared_count--;
1204
1205 genpd_unlock(genpd);
1206 }
1207
1208 /* Never return 1, as genpd don't cope with the direct_complete path. */
1209 return ret >= 0 ? 0 : ret;
1210}
1211
1212/**
1213 * genpd_finish_suspend - Completion of suspend or hibernation of device in an
1214 * I/O pm domain.
1215 * @dev: Device to suspend.
1216 * @suspend_noirq: Generic suspend_noirq callback.
1217 * @resume_noirq: Generic resume_noirq callback.
1218 *
1219 * Stop the device and remove power from the domain if all devices in it have
1220 * been stopped.
1221 */
1222static int genpd_finish_suspend(struct device *dev,
1223 int (*suspend_noirq)(struct device *dev),
1224 int (*resume_noirq)(struct device *dev))
1225{
1226 struct generic_pm_domain *genpd;
1227 int ret = 0;
1228
1229 genpd = dev_to_genpd(dev);
1230 if (IS_ERR(genpd))
1231 return -EINVAL;
1232
1233 ret = suspend_noirq(dev);
1234 if (ret)
1235 return ret;
1236
1237 if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd))
1238 return 0;
1239
1240 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1241 !pm_runtime_status_suspended(dev)) {
1242 ret = genpd_stop_dev(genpd, dev);
1243 if (ret) {
1244 resume_noirq(dev);
1245 return ret;
1246 }
1247 }
1248
1249 genpd_lock(genpd);
1250 genpd->suspended_count++;
1251 genpd_sync_power_off(genpd, true, 0);
1252 genpd_unlock(genpd);
1253
1254 return 0;
1255}
1256
1257/**
1258 * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
1259 * @dev: Device to suspend.
1260 *
1261 * Stop the device and remove power from the domain if all devices in it have
1262 * been stopped.
1263 */
1264static int genpd_suspend_noirq(struct device *dev)
1265{
1266 dev_dbg(dev, "%s()\n", __func__);
1267
1268 return genpd_finish_suspend(dev,
1269 pm_generic_suspend_noirq,
1270 pm_generic_resume_noirq);
1271}
1272
1273/**
1274 * genpd_finish_resume - Completion of resume of device in an I/O PM domain.
1275 * @dev: Device to resume.
1276 * @resume_noirq: Generic resume_noirq callback.
1277 *
1278 * Restore power to the device's PM domain, if necessary, and start the device.
1279 */
1280static int genpd_finish_resume(struct device *dev,
1281 int (*resume_noirq)(struct device *dev))
1282{
1283 struct generic_pm_domain *genpd;
1284 int ret;
1285
1286 dev_dbg(dev, "%s()\n", __func__);
1287
1288 genpd = dev_to_genpd(dev);
1289 if (IS_ERR(genpd))
1290 return -EINVAL;
1291
1292 if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd))
1293 return resume_noirq(dev);
1294
1295 genpd_lock(genpd);
1296 genpd_sync_power_on(genpd, true, 0);
1297 genpd->suspended_count--;
1298 genpd_unlock(genpd);
1299
1300 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1301 !pm_runtime_status_suspended(dev)) {
1302 ret = genpd_start_dev(genpd, dev);
1303 if (ret)
1304 return ret;
1305 }
1306
1307 return pm_generic_resume_noirq(dev);
1308}
1309
1310/**
1311 * genpd_resume_noirq - Start of resume of device in an I/O PM domain.
1312 * @dev: Device to resume.
1313 *
1314 * Restore power to the device's PM domain, if necessary, and start the device.
1315 */
1316static int genpd_resume_noirq(struct device *dev)
1317{
1318 dev_dbg(dev, "%s()\n", __func__);
1319
1320 return genpd_finish_resume(dev, pm_generic_resume_noirq);
1321}
1322
1323/**
1324 * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
1325 * @dev: Device to freeze.
1326 *
1327 * Carry out a late freeze of a device under the assumption that its
1328 * pm_domain field points to the domain member of an object of type
1329 * struct generic_pm_domain representing a power domain consisting of I/O
1330 * devices.
1331 */
1332static int genpd_freeze_noirq(struct device *dev)
1333{
1334 dev_dbg(dev, "%s()\n", __func__);
1335
1336 return genpd_finish_suspend(dev,
1337 pm_generic_freeze_noirq,
1338 pm_generic_thaw_noirq);
1339}
1340
1341/**
1342 * genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
1343 * @dev: Device to thaw.
1344 *
1345 * Start the device, unless power has been removed from the domain already
1346 * before the system transition.
1347 */
1348static int genpd_thaw_noirq(struct device *dev)
1349{
1350 dev_dbg(dev, "%s()\n", __func__);
1351
1352 return genpd_finish_resume(dev, pm_generic_thaw_noirq);
1353}
1354
1355/**
1356 * genpd_poweroff_noirq - Completion of hibernation of device in an
1357 * I/O PM domain.
1358 * @dev: Device to poweroff.
1359 *
1360 * Stop the device and remove power from the domain if all devices in it have
1361 * been stopped.
1362 */
1363static int genpd_poweroff_noirq(struct device *dev)
1364{
1365 dev_dbg(dev, "%s()\n", __func__);
1366
1367 return genpd_finish_suspend(dev,
1368 pm_generic_poweroff_noirq,
1369 pm_generic_restore_noirq);
1370}
1371
1372/**
1373 * genpd_restore_noirq - Start of restore of device in an I/O PM domain.
1374 * @dev: Device to resume.
1375 *
1376 * Make sure the domain will be in the same power state as before the
1377 * hibernation the system is resuming from and start the device if necessary.
1378 */
1379static int genpd_restore_noirq(struct device *dev)
1380{
1381 dev_dbg(dev, "%s()\n", __func__);
1382
1383 return genpd_finish_resume(dev, pm_generic_restore_noirq);
1384}
1385
1386/**
1387 * genpd_complete - Complete power transition of a device in a power domain.
1388 * @dev: Device to complete the transition of.
1389 *
1390 * Complete a power transition of a device (during a system-wide power
1391 * transition) under the assumption that its pm_domain field points to the
1392 * domain member of an object of type struct generic_pm_domain representing
1393 * a power domain consisting of I/O devices.
1394 */
1395static void genpd_complete(struct device *dev)
1396{
1397 struct generic_pm_domain *genpd;
1398
1399 dev_dbg(dev, "%s()\n", __func__);
1400
1401 genpd = dev_to_genpd(dev);
1402 if (IS_ERR(genpd))
1403 return;
1404
1405 pm_generic_complete(dev);
1406
1407 genpd_lock(genpd);
1408
1409 genpd->prepared_count--;
1410 if (!genpd->prepared_count)
1411 genpd_queue_power_off_work(genpd);
1412
1413 genpd_unlock(genpd);
1414}
1415
1416static void genpd_switch_state(struct device *dev, bool suspend)
1417{
1418 struct generic_pm_domain *genpd;
1419 bool use_lock;
1420
1421 genpd = dev_to_genpd_safe(dev);
1422 if (!genpd)
1423 return;
1424
1425 use_lock = genpd_is_irq_safe(genpd);
1426
1427 if (use_lock)
1428 genpd_lock(genpd);
1429
1430 if (suspend) {
1431 genpd->suspended_count++;
1432 genpd_sync_power_off(genpd, use_lock, 0);
1433 } else {
1434 genpd_sync_power_on(genpd, use_lock, 0);
1435 genpd->suspended_count--;
1436 }
1437
1438 if (use_lock)
1439 genpd_unlock(genpd);
1440}
1441
1442/**
1443 * dev_pm_genpd_suspend - Synchronously try to suspend the genpd for @dev
1444 * @dev: The device that is attached to the genpd, that can be suspended.
1445 *
1446 * This routine should typically be called for a device that needs to be
1447 * suspended during the syscore suspend phase. It may also be called during
1448 * suspend-to-idle to suspend a corresponding CPU device that is attached to a
1449 * genpd.
1450 */
1451void dev_pm_genpd_suspend(struct device *dev)
1452{
1453 genpd_switch_state(dev, true);
1454}
1455EXPORT_SYMBOL_GPL(dev_pm_genpd_suspend);
1456
1457/**
1458 * dev_pm_genpd_resume - Synchronously try to resume the genpd for @dev
1459 * @dev: The device that is attached to the genpd, which needs to be resumed.
1460 *
1461 * This routine should typically be called for a device that needs to be resumed
1462 * during the syscore resume phase. It may also be called during suspend-to-idle
1463 * to resume a corresponding CPU device that is attached to a genpd.
1464 */
1465void dev_pm_genpd_resume(struct device *dev)
1466{
1467 genpd_switch_state(dev, false);
1468}
1469EXPORT_SYMBOL_GPL(dev_pm_genpd_resume);
1470
1471#else /* !CONFIG_PM_SLEEP */
1472
1473#define genpd_prepare NULL
1474#define genpd_suspend_noirq NULL
1475#define genpd_resume_noirq NULL
1476#define genpd_freeze_noirq NULL
1477#define genpd_thaw_noirq NULL
1478#define genpd_poweroff_noirq NULL
1479#define genpd_restore_noirq NULL
1480#define genpd_complete NULL
1481
1482#endif /* CONFIG_PM_SLEEP */
1483
1484static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev,
1485 bool has_governor)
1486{
1487 struct generic_pm_domain_data *gpd_data;
1488 struct gpd_timing_data *td;
1489 int ret;
1490
1491 ret = dev_pm_get_subsys_data(dev);
1492 if (ret)
1493 return ERR_PTR(ret);
1494
1495 gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
1496 if (!gpd_data) {
1497 ret = -ENOMEM;
1498 goto err_put;
1499 }
1500
1501 gpd_data->base.dev = dev;
1502 gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
1503
1504 /* Allocate data used by a governor. */
1505 if (has_governor) {
1506 td = kzalloc(sizeof(*td), GFP_KERNEL);
1507 if (!td) {
1508 ret = -ENOMEM;
1509 goto err_free;
1510 }
1511
1512 td->constraint_changed = true;
1513 td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS;
1514 td->next_wakeup = KTIME_MAX;
1515 gpd_data->td = td;
1516 }
1517
1518 spin_lock_irq(&dev->power.lock);
1519
1520 if (dev->power.subsys_data->domain_data)
1521 ret = -EINVAL;
1522 else
1523 dev->power.subsys_data->domain_data = &gpd_data->base;
1524
1525 spin_unlock_irq(&dev->power.lock);
1526
1527 if (ret)
1528 goto err_free;
1529
1530 return gpd_data;
1531
1532 err_free:
1533 kfree(gpd_data->td);
1534 kfree(gpd_data);
1535 err_put:
1536 dev_pm_put_subsys_data(dev);
1537 return ERR_PTR(ret);
1538}
1539
1540static void genpd_free_dev_data(struct device *dev,
1541 struct generic_pm_domain_data *gpd_data)
1542{
1543 spin_lock_irq(&dev->power.lock);
1544
1545 dev->power.subsys_data->domain_data = NULL;
1546
1547 spin_unlock_irq(&dev->power.lock);
1548
1549 kfree(gpd_data->td);
1550 kfree(gpd_data);
1551 dev_pm_put_subsys_data(dev);
1552}
1553
1554static void genpd_update_cpumask(struct generic_pm_domain *genpd,
1555 int cpu, bool set, unsigned int depth)
1556{
1557 struct gpd_link *link;
1558
1559 if (!genpd_is_cpu_domain(genpd))
1560 return;
1561
1562 list_for_each_entry(link, &genpd->child_links, child_node) {
1563 struct generic_pm_domain *parent = link->parent;
1564
1565 genpd_lock_nested(parent, depth + 1);
1566 genpd_update_cpumask(parent, cpu, set, depth + 1);
1567 genpd_unlock(parent);
1568 }
1569
1570 if (set)
1571 cpumask_set_cpu(cpu, genpd->cpus);
1572 else
1573 cpumask_clear_cpu(cpu, genpd->cpus);
1574}
1575
1576static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu)
1577{
1578 if (cpu >= 0)
1579 genpd_update_cpumask(genpd, cpu, true, 0);
1580}
1581
1582static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu)
1583{
1584 if (cpu >= 0)
1585 genpd_update_cpumask(genpd, cpu, false, 0);
1586}
1587
1588static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev)
1589{
1590 int cpu;
1591
1592 if (!genpd_is_cpu_domain(genpd))
1593 return -1;
1594
1595 for_each_possible_cpu(cpu) {
1596 if (get_cpu_device(cpu) == dev)
1597 return cpu;
1598 }
1599
1600 return -1;
1601}
1602
1603static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
1604 struct device *base_dev)
1605{
1606 struct genpd_governor_data *gd = genpd->gd;
1607 struct generic_pm_domain_data *gpd_data;
1608 int ret;
1609
1610 dev_dbg(dev, "%s()\n", __func__);
1611
1612 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
1613 return -EINVAL;
1614
1615 gpd_data = genpd_alloc_dev_data(dev, gd);
1616 if (IS_ERR(gpd_data))
1617 return PTR_ERR(gpd_data);
1618
1619 gpd_data->cpu = genpd_get_cpu(genpd, base_dev);
1620
1621 ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
1622 if (ret)
1623 goto out;
1624
1625 genpd_lock(genpd);
1626
1627 genpd_set_cpumask(genpd, gpd_data->cpu);
1628 dev_pm_domain_set(dev, &genpd->domain);
1629
1630 genpd->device_count++;
1631 if (gd)
1632 gd->max_off_time_changed = true;
1633
1634 list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
1635
1636 genpd_unlock(genpd);
1637 out:
1638 if (ret)
1639 genpd_free_dev_data(dev, gpd_data);
1640 else
1641 dev_pm_qos_add_notifier(dev, &gpd_data->nb,
1642 DEV_PM_QOS_RESUME_LATENCY);
1643
1644 return ret;
1645}
1646
1647/**
1648 * pm_genpd_add_device - Add a device to an I/O PM domain.
1649 * @genpd: PM domain to add the device to.
1650 * @dev: Device to be added.
1651 */
1652int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
1653{
1654 int ret;
1655
1656 mutex_lock(&gpd_list_lock);
1657 ret = genpd_add_device(genpd, dev, dev);
1658 mutex_unlock(&gpd_list_lock);
1659
1660 return ret;
1661}
1662EXPORT_SYMBOL_GPL(pm_genpd_add_device);
1663
1664static int genpd_remove_device(struct generic_pm_domain *genpd,
1665 struct device *dev)
1666{
1667 struct generic_pm_domain_data *gpd_data;
1668 struct pm_domain_data *pdd;
1669 int ret = 0;
1670
1671 dev_dbg(dev, "%s()\n", __func__);
1672
1673 pdd = dev->power.subsys_data->domain_data;
1674 gpd_data = to_gpd_data(pdd);
1675 dev_pm_qos_remove_notifier(dev, &gpd_data->nb,
1676 DEV_PM_QOS_RESUME_LATENCY);
1677
1678 genpd_lock(genpd);
1679
1680 if (genpd->prepared_count > 0) {
1681 ret = -EAGAIN;
1682 goto out;
1683 }
1684
1685 genpd->device_count--;
1686 if (genpd->gd)
1687 genpd->gd->max_off_time_changed = true;
1688
1689 genpd_clear_cpumask(genpd, gpd_data->cpu);
1690 dev_pm_domain_set(dev, NULL);
1691
1692 list_del_init(&pdd->list_node);
1693
1694 genpd_unlock(genpd);
1695
1696 if (genpd->detach_dev)
1697 genpd->detach_dev(genpd, dev);
1698
1699 genpd_free_dev_data(dev, gpd_data);
1700
1701 return 0;
1702
1703 out:
1704 genpd_unlock(genpd);
1705 dev_pm_qos_add_notifier(dev, &gpd_data->nb, DEV_PM_QOS_RESUME_LATENCY);
1706
1707 return ret;
1708}
1709
1710/**
1711 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
1712 * @dev: Device to be removed.
1713 */
1714int pm_genpd_remove_device(struct device *dev)
1715{
1716 struct generic_pm_domain *genpd = dev_to_genpd_safe(dev);
1717
1718 if (!genpd)
1719 return -EINVAL;
1720
1721 return genpd_remove_device(genpd, dev);
1722}
1723EXPORT_SYMBOL_GPL(pm_genpd_remove_device);
1724
1725/**
1726 * dev_pm_genpd_add_notifier - Add a genpd power on/off notifier for @dev
1727 *
1728 * @dev: Device that should be associated with the notifier
1729 * @nb: The notifier block to register
1730 *
1731 * Users may call this function to add a genpd power on/off notifier for an
1732 * attached @dev. Only one notifier per device is allowed. The notifier is
1733 * sent when genpd is powering on/off the PM domain.
1734 *
1735 * It is assumed that the user guarantee that the genpd wouldn't be detached
1736 * while this routine is getting called.
1737 *
1738 * Returns 0 on success and negative error values on failures.
1739 */
1740int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb)
1741{
1742 struct generic_pm_domain *genpd;
1743 struct generic_pm_domain_data *gpd_data;
1744 int ret;
1745
1746 genpd = dev_to_genpd_safe(dev);
1747 if (!genpd)
1748 return -ENODEV;
1749
1750 if (WARN_ON(!dev->power.subsys_data ||
1751 !dev->power.subsys_data->domain_data))
1752 return -EINVAL;
1753
1754 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
1755 if (gpd_data->power_nb)
1756 return -EEXIST;
1757
1758 genpd_lock(genpd);
1759 ret = raw_notifier_chain_register(&genpd->power_notifiers, nb);
1760 genpd_unlock(genpd);
1761
1762 if (ret) {
1763 dev_warn(dev, "failed to add notifier for PM domain %s\n",
1764 genpd->name);
1765 return ret;
1766 }
1767
1768 gpd_data->power_nb = nb;
1769 return 0;
1770}
1771EXPORT_SYMBOL_GPL(dev_pm_genpd_add_notifier);
1772
1773/**
1774 * dev_pm_genpd_remove_notifier - Remove a genpd power on/off notifier for @dev
1775 *
1776 * @dev: Device that is associated with the notifier
1777 *
1778 * Users may call this function to remove a genpd power on/off notifier for an
1779 * attached @dev.
1780 *
1781 * It is assumed that the user guarantee that the genpd wouldn't be detached
1782 * while this routine is getting called.
1783 *
1784 * Returns 0 on success and negative error values on failures.
1785 */
1786int dev_pm_genpd_remove_notifier(struct device *dev)
1787{
1788 struct generic_pm_domain *genpd;
1789 struct generic_pm_domain_data *gpd_data;
1790 int ret;
1791
1792 genpd = dev_to_genpd_safe(dev);
1793 if (!genpd)
1794 return -ENODEV;
1795
1796 if (WARN_ON(!dev->power.subsys_data ||
1797 !dev->power.subsys_data->domain_data))
1798 return -EINVAL;
1799
1800 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
1801 if (!gpd_data->power_nb)
1802 return -ENODEV;
1803
1804 genpd_lock(genpd);
1805 ret = raw_notifier_chain_unregister(&genpd->power_notifiers,
1806 gpd_data->power_nb);
1807 genpd_unlock(genpd);
1808
1809 if (ret) {
1810 dev_warn(dev, "failed to remove notifier for PM domain %s\n",
1811 genpd->name);
1812 return ret;
1813 }
1814
1815 gpd_data->power_nb = NULL;
1816 return 0;
1817}
1818EXPORT_SYMBOL_GPL(dev_pm_genpd_remove_notifier);
1819
1820static int genpd_add_subdomain(struct generic_pm_domain *genpd,
1821 struct generic_pm_domain *subdomain)
1822{
1823 struct gpd_link *link, *itr;
1824 int ret = 0;
1825
1826 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
1827 || genpd == subdomain)
1828 return -EINVAL;
1829
1830 /*
1831 * If the domain can be powered on/off in an IRQ safe
1832 * context, ensure that the subdomain can also be
1833 * powered on/off in that context.
1834 */
1835 if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) {
1836 WARN(1, "Parent %s of subdomain %s must be IRQ safe\n",
1837 genpd->name, subdomain->name);
1838 return -EINVAL;
1839 }
1840
1841 link = kzalloc(sizeof(*link), GFP_KERNEL);
1842 if (!link)
1843 return -ENOMEM;
1844
1845 genpd_lock(subdomain);
1846 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
1847
1848 if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) {
1849 ret = -EINVAL;
1850 goto out;
1851 }
1852
1853 list_for_each_entry(itr, &genpd->parent_links, parent_node) {
1854 if (itr->child == subdomain && itr->parent == genpd) {
1855 ret = -EINVAL;
1856 goto out;
1857 }
1858 }
1859
1860 link->parent = genpd;
1861 list_add_tail(&link->parent_node, &genpd->parent_links);
1862 link->child = subdomain;
1863 list_add_tail(&link->child_node, &subdomain->child_links);
1864 if (genpd_status_on(subdomain))
1865 genpd_sd_counter_inc(genpd);
1866
1867 out:
1868 genpd_unlock(genpd);
1869 genpd_unlock(subdomain);
1870 if (ret)
1871 kfree(link);
1872 return ret;
1873}
1874
1875/**
1876 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
1877 * @genpd: Leader PM domain to add the subdomain to.
1878 * @subdomain: Subdomain to be added.
1879 */
1880int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
1881 struct generic_pm_domain *subdomain)
1882{
1883 int ret;
1884
1885 mutex_lock(&gpd_list_lock);
1886 ret = genpd_add_subdomain(genpd, subdomain);
1887 mutex_unlock(&gpd_list_lock);
1888
1889 return ret;
1890}
1891EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain);
1892
1893/**
1894 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
1895 * @genpd: Leader PM domain to remove the subdomain from.
1896 * @subdomain: Subdomain to be removed.
1897 */
1898int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
1899 struct generic_pm_domain *subdomain)
1900{
1901 struct gpd_link *l, *link;
1902 int ret = -EINVAL;
1903
1904 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
1905 return -EINVAL;
1906
1907 genpd_lock(subdomain);
1908 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
1909
1910 if (!list_empty(&subdomain->parent_links) || subdomain->device_count) {
1911 pr_warn("%s: unable to remove subdomain %s\n",
1912 genpd->name, subdomain->name);
1913 ret = -EBUSY;
1914 goto out;
1915 }
1916
1917 list_for_each_entry_safe(link, l, &genpd->parent_links, parent_node) {
1918 if (link->child != subdomain)
1919 continue;
1920
1921 list_del(&link->parent_node);
1922 list_del(&link->child_node);
1923 kfree(link);
1924 if (genpd_status_on(subdomain))
1925 genpd_sd_counter_dec(genpd);
1926
1927 ret = 0;
1928 break;
1929 }
1930
1931out:
1932 genpd_unlock(genpd);
1933 genpd_unlock(subdomain);
1934
1935 return ret;
1936}
1937EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain);
1938
1939static void genpd_free_default_power_state(struct genpd_power_state *states,
1940 unsigned int state_count)
1941{
1942 kfree(states);
1943}
1944
1945static int genpd_set_default_power_state(struct generic_pm_domain *genpd)
1946{
1947 struct genpd_power_state *state;
1948
1949 state = kzalloc(sizeof(*state), GFP_KERNEL);
1950 if (!state)
1951 return -ENOMEM;
1952
1953 genpd->states = state;
1954 genpd->state_count = 1;
1955 genpd->free_states = genpd_free_default_power_state;
1956
1957 return 0;
1958}
1959
1960static int genpd_alloc_data(struct generic_pm_domain *genpd)
1961{
1962 struct genpd_governor_data *gd = NULL;
1963 int ret;
1964
1965 if (genpd_is_cpu_domain(genpd) &&
1966 !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL))
1967 return -ENOMEM;
1968
1969 if (genpd->gov) {
1970 gd = kzalloc(sizeof(*gd), GFP_KERNEL);
1971 if (!gd) {
1972 ret = -ENOMEM;
1973 goto free;
1974 }
1975
1976 gd->max_off_time_ns = -1;
1977 gd->max_off_time_changed = true;
1978 gd->next_wakeup = KTIME_MAX;
1979 gd->next_hrtimer = KTIME_MAX;
1980 }
1981
1982 /* Use only one "off" state if there were no states declared */
1983 if (genpd->state_count == 0) {
1984 ret = genpd_set_default_power_state(genpd);
1985 if (ret)
1986 goto free;
1987 }
1988
1989 genpd->gd = gd;
1990 return 0;
1991
1992free:
1993 if (genpd_is_cpu_domain(genpd))
1994 free_cpumask_var(genpd->cpus);
1995 kfree(gd);
1996 return ret;
1997}
1998
1999static void genpd_free_data(struct generic_pm_domain *genpd)
2000{
2001 if (genpd_is_cpu_domain(genpd))
2002 free_cpumask_var(genpd->cpus);
2003 if (genpd->free_states)
2004 genpd->free_states(genpd->states, genpd->state_count);
2005 kfree(genpd->gd);
2006}
2007
2008static void genpd_lock_init(struct generic_pm_domain *genpd)
2009{
2010 if (genpd->flags & GENPD_FLAG_IRQ_SAFE) {
2011 spin_lock_init(&genpd->slock);
2012 genpd->lock_ops = &genpd_spin_ops;
2013 } else {
2014 mutex_init(&genpd->mlock);
2015 genpd->lock_ops = &genpd_mtx_ops;
2016 }
2017}
2018
2019/**
2020 * pm_genpd_init - Initialize a generic I/O PM domain object.
2021 * @genpd: PM domain object to initialize.
2022 * @gov: PM domain governor to associate with the domain (may be NULL).
2023 * @is_off: Initial value of the domain's power_is_off field.
2024 *
2025 * Returns 0 on successful initialization, else a negative error code.
2026 */
2027int pm_genpd_init(struct generic_pm_domain *genpd,
2028 struct dev_power_governor *gov, bool is_off)
2029{
2030 int ret;
2031
2032 if (IS_ERR_OR_NULL(genpd))
2033 return -EINVAL;
2034
2035 INIT_LIST_HEAD(&genpd->parent_links);
2036 INIT_LIST_HEAD(&genpd->child_links);
2037 INIT_LIST_HEAD(&genpd->dev_list);
2038 RAW_INIT_NOTIFIER_HEAD(&genpd->power_notifiers);
2039 genpd_lock_init(genpd);
2040 genpd->gov = gov;
2041 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
2042 atomic_set(&genpd->sd_count, 0);
2043 genpd->status = is_off ? GENPD_STATE_OFF : GENPD_STATE_ON;
2044 genpd->device_count = 0;
2045 genpd->provider = NULL;
2046 genpd->has_provider = false;
2047 genpd->accounting_time = ktime_get_mono_fast_ns();
2048 genpd->domain.ops.runtime_suspend = genpd_runtime_suspend;
2049 genpd->domain.ops.runtime_resume = genpd_runtime_resume;
2050 genpd->domain.ops.prepare = genpd_prepare;
2051 genpd->domain.ops.suspend_noirq = genpd_suspend_noirq;
2052 genpd->domain.ops.resume_noirq = genpd_resume_noirq;
2053 genpd->domain.ops.freeze_noirq = genpd_freeze_noirq;
2054 genpd->domain.ops.thaw_noirq = genpd_thaw_noirq;
2055 genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq;
2056 genpd->domain.ops.restore_noirq = genpd_restore_noirq;
2057 genpd->domain.ops.complete = genpd_complete;
2058 genpd->domain.start = genpd_dev_pm_start;
2059
2060 if (genpd->flags & GENPD_FLAG_PM_CLK) {
2061 genpd->dev_ops.stop = pm_clk_suspend;
2062 genpd->dev_ops.start = pm_clk_resume;
2063 }
2064
2065 /* The always-on governor works better with the corresponding flag. */
2066 if (gov == &pm_domain_always_on_gov)
2067 genpd->flags |= GENPD_FLAG_RPM_ALWAYS_ON;
2068
2069 /* Always-on domains must be powered on at initialization. */
2070 if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) &&
2071 !genpd_status_on(genpd)) {
2072 pr_err("always-on PM domain %s is not on\n", genpd->name);
2073 return -EINVAL;
2074 }
2075
2076 /* Multiple states but no governor doesn't make sense. */
2077 if (!gov && genpd->state_count > 1)
2078 pr_warn("%s: no governor for states\n", genpd->name);
2079
2080 ret = genpd_alloc_data(genpd);
2081 if (ret)
2082 return ret;
2083
2084 device_initialize(&genpd->dev);
2085 dev_set_name(&genpd->dev, "%s", genpd->name);
2086
2087 mutex_lock(&gpd_list_lock);
2088 list_add(&genpd->gpd_list_node, &gpd_list);
2089 mutex_unlock(&gpd_list_lock);
2090 genpd_debug_add(genpd);
2091
2092 return 0;
2093}
2094EXPORT_SYMBOL_GPL(pm_genpd_init);
2095
2096static int genpd_remove(struct generic_pm_domain *genpd)
2097{
2098 struct gpd_link *l, *link;
2099
2100 if (IS_ERR_OR_NULL(genpd))
2101 return -EINVAL;
2102
2103 genpd_lock(genpd);
2104
2105 if (genpd->has_provider) {
2106 genpd_unlock(genpd);
2107 pr_err("Provider present, unable to remove %s\n", genpd->name);
2108 return -EBUSY;
2109 }
2110
2111 if (!list_empty(&genpd->parent_links) || genpd->device_count) {
2112 genpd_unlock(genpd);
2113 pr_err("%s: unable to remove %s\n", __func__, genpd->name);
2114 return -EBUSY;
2115 }
2116
2117 list_for_each_entry_safe(link, l, &genpd->child_links, child_node) {
2118 list_del(&link->parent_node);
2119 list_del(&link->child_node);
2120 kfree(link);
2121 }
2122
2123 list_del(&genpd->gpd_list_node);
2124 genpd_unlock(genpd);
2125 genpd_debug_remove(genpd);
2126 cancel_work_sync(&genpd->power_off_work);
2127 genpd_free_data(genpd);
2128
2129 pr_debug("%s: removed %s\n", __func__, genpd->name);
2130
2131 return 0;
2132}
2133
2134/**
2135 * pm_genpd_remove - Remove a generic I/O PM domain
2136 * @genpd: Pointer to PM domain that is to be removed.
2137 *
2138 * To remove the PM domain, this function:
2139 * - Removes the PM domain as a subdomain to any parent domains,
2140 * if it was added.
2141 * - Removes the PM domain from the list of registered PM domains.
2142 *
2143 * The PM domain will only be removed, if the associated provider has
2144 * been removed, it is not a parent to any other PM domain and has no
2145 * devices associated with it.
2146 */
2147int pm_genpd_remove(struct generic_pm_domain *genpd)
2148{
2149 int ret;
2150
2151 mutex_lock(&gpd_list_lock);
2152 ret = genpd_remove(genpd);
2153 mutex_unlock(&gpd_list_lock);
2154
2155 return ret;
2156}
2157EXPORT_SYMBOL_GPL(pm_genpd_remove);
2158
2159#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
2160
2161/*
2162 * Device Tree based PM domain providers.
2163 *
2164 * The code below implements generic device tree based PM domain providers that
2165 * bind device tree nodes with generic PM domains registered in the system.
2166 *
2167 * Any driver that registers generic PM domains and needs to support binding of
2168 * devices to these domains is supposed to register a PM domain provider, which
2169 * maps a PM domain specifier retrieved from the device tree to a PM domain.
2170 *
2171 * Two simple mapping functions have been provided for convenience:
2172 * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping.
2173 * - genpd_xlate_onecell() for mapping of multiple PM domains per node by
2174 * index.
2175 */
2176
2177/**
2178 * struct of_genpd_provider - PM domain provider registration structure
2179 * @link: Entry in global list of PM domain providers
2180 * @node: Pointer to device tree node of PM domain provider
2181 * @xlate: Provider-specific xlate callback mapping a set of specifier cells
2182 * into a PM domain.
2183 * @data: context pointer to be passed into @xlate callback
2184 */
2185struct of_genpd_provider {
2186 struct list_head link;
2187 struct device_node *node;
2188 genpd_xlate_t xlate;
2189 void *data;
2190};
2191
2192/* List of registered PM domain providers. */
2193static LIST_HEAD(of_genpd_providers);
2194/* Mutex to protect the list above. */
2195static DEFINE_MUTEX(of_genpd_mutex);
2196
2197/**
2198 * genpd_xlate_simple() - Xlate function for direct node-domain mapping
2199 * @genpdspec: OF phandle args to map into a PM domain
2200 * @data: xlate function private data - pointer to struct generic_pm_domain
2201 *
2202 * This is a generic xlate function that can be used to model PM domains that
2203 * have their own device tree nodes. The private data of xlate function needs
2204 * to be a valid pointer to struct generic_pm_domain.
2205 */
2206static struct generic_pm_domain *genpd_xlate_simple(
2207 struct of_phandle_args *genpdspec,
2208 void *data)
2209{
2210 return data;
2211}
2212
2213/**
2214 * genpd_xlate_onecell() - Xlate function using a single index.
2215 * @genpdspec: OF phandle args to map into a PM domain
2216 * @data: xlate function private data - pointer to struct genpd_onecell_data
2217 *
2218 * This is a generic xlate function that can be used to model simple PM domain
2219 * controllers that have one device tree node and provide multiple PM domains.
2220 * A single cell is used as an index into an array of PM domains specified in
2221 * the genpd_onecell_data struct when registering the provider.
2222 */
2223static struct generic_pm_domain *genpd_xlate_onecell(
2224 struct of_phandle_args *genpdspec,
2225 void *data)
2226{
2227 struct genpd_onecell_data *genpd_data = data;
2228 unsigned int idx = genpdspec->args[0];
2229
2230 if (genpdspec->args_count != 1)
2231 return ERR_PTR(-EINVAL);
2232
2233 if (idx >= genpd_data->num_domains) {
2234 pr_err("%s: invalid domain index %u\n", __func__, idx);
2235 return ERR_PTR(-EINVAL);
2236 }
2237
2238 if (!genpd_data->domains[idx])
2239 return ERR_PTR(-ENOENT);
2240
2241 return genpd_data->domains[idx];
2242}
2243
2244/**
2245 * genpd_add_provider() - Register a PM domain provider for a node
2246 * @np: Device node pointer associated with the PM domain provider.
2247 * @xlate: Callback for decoding PM domain from phandle arguments.
2248 * @data: Context pointer for @xlate callback.
2249 */
2250static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
2251 void *data)
2252{
2253 struct of_genpd_provider *cp;
2254
2255 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
2256 if (!cp)
2257 return -ENOMEM;
2258
2259 cp->node = of_node_get(np);
2260 cp->data = data;
2261 cp->xlate = xlate;
2262 fwnode_dev_initialized(&np->fwnode, true);
2263
2264 mutex_lock(&of_genpd_mutex);
2265 list_add(&cp->link, &of_genpd_providers);
2266 mutex_unlock(&of_genpd_mutex);
2267 pr_debug("Added domain provider from %pOF\n", np);
2268
2269 return 0;
2270}
2271
2272static bool genpd_present(const struct generic_pm_domain *genpd)
2273{
2274 bool ret = false;
2275 const struct generic_pm_domain *gpd;
2276
2277 mutex_lock(&gpd_list_lock);
2278 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
2279 if (gpd == genpd) {
2280 ret = true;
2281 break;
2282 }
2283 }
2284 mutex_unlock(&gpd_list_lock);
2285
2286 return ret;
2287}
2288
2289/**
2290 * of_genpd_add_provider_simple() - Register a simple PM domain provider
2291 * @np: Device node pointer associated with the PM domain provider.
2292 * @genpd: Pointer to PM domain associated with the PM domain provider.
2293 */
2294int of_genpd_add_provider_simple(struct device_node *np,
2295 struct generic_pm_domain *genpd)
2296{
2297 int ret;
2298
2299 if (!np || !genpd)
2300 return -EINVAL;
2301
2302 if (!genpd_present(genpd))
2303 return -EINVAL;
2304
2305 genpd->dev.of_node = np;
2306
2307 /* Parse genpd OPP table */
2308 if (genpd->set_performance_state) {
2309 ret = dev_pm_opp_of_add_table(&genpd->dev);
2310 if (ret)
2311 return dev_err_probe(&genpd->dev, ret, "Failed to add OPP table\n");
2312
2313 /*
2314 * Save table for faster processing while setting performance
2315 * state.
2316 */
2317 genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev);
2318 WARN_ON(IS_ERR(genpd->opp_table));
2319 }
2320
2321 ret = genpd_add_provider(np, genpd_xlate_simple, genpd);
2322 if (ret) {
2323 if (genpd->set_performance_state) {
2324 dev_pm_opp_put_opp_table(genpd->opp_table);
2325 dev_pm_opp_of_remove_table(&genpd->dev);
2326 }
2327
2328 return ret;
2329 }
2330
2331 genpd->provider = &np->fwnode;
2332 genpd->has_provider = true;
2333
2334 return 0;
2335}
2336EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple);
2337
2338/**
2339 * of_genpd_add_provider_onecell() - Register a onecell PM domain provider
2340 * @np: Device node pointer associated with the PM domain provider.
2341 * @data: Pointer to the data associated with the PM domain provider.
2342 */
2343int of_genpd_add_provider_onecell(struct device_node *np,
2344 struct genpd_onecell_data *data)
2345{
2346 struct generic_pm_domain *genpd;
2347 unsigned int i;
2348 int ret = -EINVAL;
2349
2350 if (!np || !data)
2351 return -EINVAL;
2352
2353 if (!data->xlate)
2354 data->xlate = genpd_xlate_onecell;
2355
2356 for (i = 0; i < data->num_domains; i++) {
2357 genpd = data->domains[i];
2358
2359 if (!genpd)
2360 continue;
2361 if (!genpd_present(genpd))
2362 goto error;
2363
2364 genpd->dev.of_node = np;
2365
2366 /* Parse genpd OPP table */
2367 if (genpd->set_performance_state) {
2368 ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i);
2369 if (ret) {
2370 dev_err_probe(&genpd->dev, ret,
2371 "Failed to add OPP table for index %d\n", i);
2372 goto error;
2373 }
2374
2375 /*
2376 * Save table for faster processing while setting
2377 * performance state.
2378 */
2379 genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev);
2380 WARN_ON(IS_ERR(genpd->opp_table));
2381 }
2382
2383 genpd->provider = &np->fwnode;
2384 genpd->has_provider = true;
2385 }
2386
2387 ret = genpd_add_provider(np, data->xlate, data);
2388 if (ret < 0)
2389 goto error;
2390
2391 return 0;
2392
2393error:
2394 while (i--) {
2395 genpd = data->domains[i];
2396
2397 if (!genpd)
2398 continue;
2399
2400 genpd->provider = NULL;
2401 genpd->has_provider = false;
2402
2403 if (genpd->set_performance_state) {
2404 dev_pm_opp_put_opp_table(genpd->opp_table);
2405 dev_pm_opp_of_remove_table(&genpd->dev);
2406 }
2407 }
2408
2409 return ret;
2410}
2411EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell);
2412
2413/**
2414 * of_genpd_del_provider() - Remove a previously registered PM domain provider
2415 * @np: Device node pointer associated with the PM domain provider
2416 */
2417void of_genpd_del_provider(struct device_node *np)
2418{
2419 struct of_genpd_provider *cp, *tmp;
2420 struct generic_pm_domain *gpd;
2421
2422 mutex_lock(&gpd_list_lock);
2423 mutex_lock(&of_genpd_mutex);
2424 list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) {
2425 if (cp->node == np) {
2426 /*
2427 * For each PM domain associated with the
2428 * provider, set the 'has_provider' to false
2429 * so that the PM domain can be safely removed.
2430 */
2431 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
2432 if (gpd->provider == &np->fwnode) {
2433 gpd->has_provider = false;
2434
2435 if (!gpd->set_performance_state)
2436 continue;
2437
2438 dev_pm_opp_put_opp_table(gpd->opp_table);
2439 dev_pm_opp_of_remove_table(&gpd->dev);
2440 }
2441 }
2442
2443 fwnode_dev_initialized(&cp->node->fwnode, false);
2444 list_del(&cp->link);
2445 of_node_put(cp->node);
2446 kfree(cp);
2447 break;
2448 }
2449 }
2450 mutex_unlock(&of_genpd_mutex);
2451 mutex_unlock(&gpd_list_lock);
2452}
2453EXPORT_SYMBOL_GPL(of_genpd_del_provider);
2454
2455/**
2456 * genpd_get_from_provider() - Look-up PM domain
2457 * @genpdspec: OF phandle args to use for look-up
2458 *
2459 * Looks for a PM domain provider under the node specified by @genpdspec and if
2460 * found, uses xlate function of the provider to map phandle args to a PM
2461 * domain.
2462 *
2463 * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
2464 * on failure.
2465 */
2466static struct generic_pm_domain *genpd_get_from_provider(
2467 struct of_phandle_args *genpdspec)
2468{
2469 struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
2470 struct of_genpd_provider *provider;
2471
2472 if (!genpdspec)
2473 return ERR_PTR(-EINVAL);
2474
2475 mutex_lock(&of_genpd_mutex);
2476
2477 /* Check if we have such a provider in our array */
2478 list_for_each_entry(provider, &of_genpd_providers, link) {
2479 if (provider->node == genpdspec->np)
2480 genpd = provider->xlate(genpdspec, provider->data);
2481 if (!IS_ERR(genpd))
2482 break;
2483 }
2484
2485 mutex_unlock(&of_genpd_mutex);
2486
2487 return genpd;
2488}
2489
2490/**
2491 * of_genpd_add_device() - Add a device to an I/O PM domain
2492 * @genpdspec: OF phandle args to use for look-up PM domain
2493 * @dev: Device to be added.
2494 *
2495 * Looks-up an I/O PM domain based upon phandle args provided and adds
2496 * the device to the PM domain. Returns a negative error code on failure.
2497 */
2498int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev)
2499{
2500 struct generic_pm_domain *genpd;
2501 int ret;
2502
2503 mutex_lock(&gpd_list_lock);
2504
2505 genpd = genpd_get_from_provider(genpdspec);
2506 if (IS_ERR(genpd)) {
2507 ret = PTR_ERR(genpd);
2508 goto out;
2509 }
2510
2511 ret = genpd_add_device(genpd, dev, dev);
2512
2513out:
2514 mutex_unlock(&gpd_list_lock);
2515
2516 return ret;
2517}
2518EXPORT_SYMBOL_GPL(of_genpd_add_device);
2519
2520/**
2521 * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
2522 * @parent_spec: OF phandle args to use for parent PM domain look-up
2523 * @subdomain_spec: OF phandle args to use for subdomain look-up
2524 *
2525 * Looks-up a parent PM domain and subdomain based upon phandle args
2526 * provided and adds the subdomain to the parent PM domain. Returns a
2527 * negative error code on failure.
2528 */
2529int of_genpd_add_subdomain(struct of_phandle_args *parent_spec,
2530 struct of_phandle_args *subdomain_spec)
2531{
2532 struct generic_pm_domain *parent, *subdomain;
2533 int ret;
2534
2535 mutex_lock(&gpd_list_lock);
2536
2537 parent = genpd_get_from_provider(parent_spec);
2538 if (IS_ERR(parent)) {
2539 ret = PTR_ERR(parent);
2540 goto out;
2541 }
2542
2543 subdomain = genpd_get_from_provider(subdomain_spec);
2544 if (IS_ERR(subdomain)) {
2545 ret = PTR_ERR(subdomain);
2546 goto out;
2547 }
2548
2549 ret = genpd_add_subdomain(parent, subdomain);
2550
2551out:
2552 mutex_unlock(&gpd_list_lock);
2553
2554 return ret == -ENOENT ? -EPROBE_DEFER : ret;
2555}
2556EXPORT_SYMBOL_GPL(of_genpd_add_subdomain);
2557
2558/**
2559 * of_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
2560 * @parent_spec: OF phandle args to use for parent PM domain look-up
2561 * @subdomain_spec: OF phandle args to use for subdomain look-up
2562 *
2563 * Looks-up a parent PM domain and subdomain based upon phandle args
2564 * provided and removes the subdomain from the parent PM domain. Returns a
2565 * negative error code on failure.
2566 */
2567int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec,
2568 struct of_phandle_args *subdomain_spec)
2569{
2570 struct generic_pm_domain *parent, *subdomain;
2571 int ret;
2572
2573 mutex_lock(&gpd_list_lock);
2574
2575 parent = genpd_get_from_provider(parent_spec);
2576 if (IS_ERR(parent)) {
2577 ret = PTR_ERR(parent);
2578 goto out;
2579 }
2580
2581 subdomain = genpd_get_from_provider(subdomain_spec);
2582 if (IS_ERR(subdomain)) {
2583 ret = PTR_ERR(subdomain);
2584 goto out;
2585 }
2586
2587 ret = pm_genpd_remove_subdomain(parent, subdomain);
2588
2589out:
2590 mutex_unlock(&gpd_list_lock);
2591
2592 return ret;
2593}
2594EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain);
2595
2596/**
2597 * of_genpd_remove_last - Remove the last PM domain registered for a provider
2598 * @np: Pointer to device node associated with provider
2599 *
2600 * Find the last PM domain that was added by a particular provider and
2601 * remove this PM domain from the list of PM domains. The provider is
2602 * identified by the 'provider' device structure that is passed. The PM
2603 * domain will only be removed, if the provider associated with domain
2604 * has been removed.
2605 *
2606 * Returns a valid pointer to struct generic_pm_domain on success or
2607 * ERR_PTR() on failure.
2608 */
2609struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
2610{
2611 struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT);
2612 int ret;
2613
2614 if (IS_ERR_OR_NULL(np))
2615 return ERR_PTR(-EINVAL);
2616
2617 mutex_lock(&gpd_list_lock);
2618 list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) {
2619 if (gpd->provider == &np->fwnode) {
2620 ret = genpd_remove(gpd);
2621 genpd = ret ? ERR_PTR(ret) : gpd;
2622 break;
2623 }
2624 }
2625 mutex_unlock(&gpd_list_lock);
2626
2627 return genpd;
2628}
2629EXPORT_SYMBOL_GPL(of_genpd_remove_last);
2630
2631static void genpd_release_dev(struct device *dev)
2632{
2633 of_node_put(dev->of_node);
2634 kfree(dev);
2635}
2636
2637static struct bus_type genpd_bus_type = {
2638 .name = "genpd",
2639};
2640
2641/**
2642 * genpd_dev_pm_detach - Detach a device from its PM domain.
2643 * @dev: Device to detach.
2644 * @power_off: Currently not used
2645 *
2646 * Try to locate a corresponding generic PM domain, which the device was
2647 * attached to previously. If such is found, the device is detached from it.
2648 */
2649static void genpd_dev_pm_detach(struct device *dev, bool power_off)
2650{
2651 struct generic_pm_domain *pd;
2652 unsigned int i;
2653 int ret = 0;
2654
2655 pd = dev_to_genpd(dev);
2656 if (IS_ERR(pd))
2657 return;
2658
2659 dev_dbg(dev, "removing from PM domain %s\n", pd->name);
2660
2661 /* Drop the default performance state */
2662 if (dev_gpd_data(dev)->default_pstate) {
2663 dev_pm_genpd_set_performance_state(dev, 0);
2664 dev_gpd_data(dev)->default_pstate = 0;
2665 }
2666
2667 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
2668 ret = genpd_remove_device(pd, dev);
2669 if (ret != -EAGAIN)
2670 break;
2671
2672 mdelay(i);
2673 cond_resched();
2674 }
2675
2676 if (ret < 0) {
2677 dev_err(dev, "failed to remove from PM domain %s: %d",
2678 pd->name, ret);
2679 return;
2680 }
2681
2682 /* Check if PM domain can be powered off after removing this device. */
2683 genpd_queue_power_off_work(pd);
2684
2685 /* Unregister the device if it was created by genpd. */
2686 if (dev->bus == &genpd_bus_type)
2687 device_unregister(dev);
2688}
2689
2690static void genpd_dev_pm_sync(struct device *dev)
2691{
2692 struct generic_pm_domain *pd;
2693
2694 pd = dev_to_genpd(dev);
2695 if (IS_ERR(pd))
2696 return;
2697
2698 genpd_queue_power_off_work(pd);
2699}
2700
2701static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
2702 unsigned int index, bool power_on)
2703{
2704 struct of_phandle_args pd_args;
2705 struct generic_pm_domain *pd;
2706 int pstate;
2707 int ret;
2708
2709 ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
2710 "#power-domain-cells", index, &pd_args);
2711 if (ret < 0)
2712 return ret;
2713
2714 mutex_lock(&gpd_list_lock);
2715 pd = genpd_get_from_provider(&pd_args);
2716 of_node_put(pd_args.np);
2717 if (IS_ERR(pd)) {
2718 mutex_unlock(&gpd_list_lock);
2719 dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
2720 __func__, PTR_ERR(pd));
2721 return driver_deferred_probe_check_state(base_dev);
2722 }
2723
2724 dev_dbg(dev, "adding to PM domain %s\n", pd->name);
2725
2726 ret = genpd_add_device(pd, dev, base_dev);
2727 mutex_unlock(&gpd_list_lock);
2728
2729 if (ret < 0)
2730 return dev_err_probe(dev, ret, "failed to add to PM domain %s\n", pd->name);
2731
2732 dev->pm_domain->detach = genpd_dev_pm_detach;
2733 dev->pm_domain->sync = genpd_dev_pm_sync;
2734
2735 /* Set the default performance state */
2736 pstate = of_get_required_opp_performance_state(dev->of_node, index);
2737 if (pstate < 0 && pstate != -ENODEV && pstate != -EOPNOTSUPP) {
2738 ret = pstate;
2739 goto err;
2740 } else if (pstate > 0) {
2741 ret = dev_pm_genpd_set_performance_state(dev, pstate);
2742 if (ret)
2743 goto err;
2744 dev_gpd_data(dev)->default_pstate = pstate;
2745 }
2746
2747 if (power_on) {
2748 genpd_lock(pd);
2749 ret = genpd_power_on(pd, 0);
2750 genpd_unlock(pd);
2751 }
2752
2753 if (ret) {
2754 /* Drop the default performance state */
2755 if (dev_gpd_data(dev)->default_pstate) {
2756 dev_pm_genpd_set_performance_state(dev, 0);
2757 dev_gpd_data(dev)->default_pstate = 0;
2758 }
2759
2760 genpd_remove_device(pd, dev);
2761 return -EPROBE_DEFER;
2762 }
2763
2764 return 1;
2765
2766err:
2767 dev_err(dev, "failed to set required performance state for power-domain %s: %d\n",
2768 pd->name, ret);
2769 genpd_remove_device(pd, dev);
2770 return ret;
2771}
2772
2773/**
2774 * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
2775 * @dev: Device to attach.
2776 *
2777 * Parse device's OF node to find a PM domain specifier. If such is found,
2778 * attaches the device to retrieved pm_domain ops.
2779 *
2780 * Returns 1 on successfully attached PM domain, 0 when the device don't need a
2781 * PM domain or when multiple power-domains exists for it, else a negative error
2782 * code. Note that if a power-domain exists for the device, but it cannot be
2783 * found or turned on, then return -EPROBE_DEFER to ensure that the device is
2784 * not probed and to re-try again later.
2785 */
2786int genpd_dev_pm_attach(struct device *dev)
2787{
2788 if (!dev->of_node)
2789 return 0;
2790
2791 /*
2792 * Devices with multiple PM domains must be attached separately, as we
2793 * can only attach one PM domain per device.
2794 */
2795 if (of_count_phandle_with_args(dev->of_node, "power-domains",
2796 "#power-domain-cells") != 1)
2797 return 0;
2798
2799 return __genpd_dev_pm_attach(dev, dev, 0, true);
2800}
2801EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
2802
2803/**
2804 * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains.
2805 * @dev: The device used to lookup the PM domain.
2806 * @index: The index of the PM domain.
2807 *
2808 * Parse device's OF node to find a PM domain specifier at the provided @index.
2809 * If such is found, creates a virtual device and attaches it to the retrieved
2810 * pm_domain ops. To deal with detaching of the virtual device, the ->detach()
2811 * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach().
2812 *
2813 * Returns the created virtual device if successfully attached PM domain, NULL
2814 * when the device don't need a PM domain, else an ERR_PTR() in case of
2815 * failures. If a power-domain exists for the device, but cannot be found or
2816 * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device
2817 * is not probed and to re-try again later.
2818 */
2819struct device *genpd_dev_pm_attach_by_id(struct device *dev,
2820 unsigned int index)
2821{
2822 struct device *virt_dev;
2823 int num_domains;
2824 int ret;
2825
2826 if (!dev->of_node)
2827 return NULL;
2828
2829 /* Verify that the index is within a valid range. */
2830 num_domains = of_count_phandle_with_args(dev->of_node, "power-domains",
2831 "#power-domain-cells");
2832 if (index >= num_domains)
2833 return NULL;
2834
2835 /* Allocate and register device on the genpd bus. */
2836 virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL);
2837 if (!virt_dev)
2838 return ERR_PTR(-ENOMEM);
2839
2840 dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev));
2841 virt_dev->bus = &genpd_bus_type;
2842 virt_dev->release = genpd_release_dev;
2843 virt_dev->of_node = of_node_get(dev->of_node);
2844
2845 ret = device_register(virt_dev);
2846 if (ret) {
2847 put_device(virt_dev);
2848 return ERR_PTR(ret);
2849 }
2850
2851 /* Try to attach the device to the PM domain at the specified index. */
2852 ret = __genpd_dev_pm_attach(virt_dev, dev, index, false);
2853 if (ret < 1) {
2854 device_unregister(virt_dev);
2855 return ret ? ERR_PTR(ret) : NULL;
2856 }
2857
2858 pm_runtime_enable(virt_dev);
2859 genpd_queue_power_off_work(dev_to_genpd(virt_dev));
2860
2861 return virt_dev;
2862}
2863EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id);
2864
2865/**
2866 * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains.
2867 * @dev: The device used to lookup the PM domain.
2868 * @name: The name of the PM domain.
2869 *
2870 * Parse device's OF node to find a PM domain specifier using the
2871 * power-domain-names DT property. For further description see
2872 * genpd_dev_pm_attach_by_id().
2873 */
2874struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name)
2875{
2876 int index;
2877
2878 if (!dev->of_node)
2879 return NULL;
2880
2881 index = of_property_match_string(dev->of_node, "power-domain-names",
2882 name);
2883 if (index < 0)
2884 return NULL;
2885
2886 return genpd_dev_pm_attach_by_id(dev, index);
2887}
2888
2889static const struct of_device_id idle_state_match[] = {
2890 { .compatible = "domain-idle-state", },
2891 { }
2892};
2893
2894static int genpd_parse_state(struct genpd_power_state *genpd_state,
2895 struct device_node *state_node)
2896{
2897 int err;
2898 u32 residency;
2899 u32 entry_latency, exit_latency;
2900
2901 err = of_property_read_u32(state_node, "entry-latency-us",
2902 &entry_latency);
2903 if (err) {
2904 pr_debug(" * %pOF missing entry-latency-us property\n",
2905 state_node);
2906 return -EINVAL;
2907 }
2908
2909 err = of_property_read_u32(state_node, "exit-latency-us",
2910 &exit_latency);
2911 if (err) {
2912 pr_debug(" * %pOF missing exit-latency-us property\n",
2913 state_node);
2914 return -EINVAL;
2915 }
2916
2917 err = of_property_read_u32(state_node, "min-residency-us", &residency);
2918 if (!err)
2919 genpd_state->residency_ns = 1000 * residency;
2920
2921 genpd_state->power_on_latency_ns = 1000 * exit_latency;
2922 genpd_state->power_off_latency_ns = 1000 * entry_latency;
2923 genpd_state->fwnode = &state_node->fwnode;
2924
2925 return 0;
2926}
2927
2928static int genpd_iterate_idle_states(struct device_node *dn,
2929 struct genpd_power_state *states)
2930{
2931 int ret;
2932 struct of_phandle_iterator it;
2933 struct device_node *np;
2934 int i = 0;
2935
2936 ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL);
2937 if (ret <= 0)
2938 return ret == -ENOENT ? 0 : ret;
2939
2940 /* Loop over the phandles until all the requested entry is found */
2941 of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) {
2942 np = it.node;
2943 if (!of_match_node(idle_state_match, np))
2944 continue;
2945
2946 if (!of_device_is_available(np))
2947 continue;
2948
2949 if (states) {
2950 ret = genpd_parse_state(&states[i], np);
2951 if (ret) {
2952 pr_err("Parsing idle state node %pOF failed with err %d\n",
2953 np, ret);
2954 of_node_put(np);
2955 return ret;
2956 }
2957 }
2958 i++;
2959 }
2960
2961 return i;
2962}
2963
2964/**
2965 * of_genpd_parse_idle_states: Return array of idle states for the genpd.
2966 *
2967 * @dn: The genpd device node
2968 * @states: The pointer to which the state array will be saved.
2969 * @n: The count of elements in the array returned from this function.
2970 *
2971 * Returns the device states parsed from the OF node. The memory for the states
2972 * is allocated by this function and is the responsibility of the caller to
2973 * free the memory after use. If any or zero compatible domain idle states is
2974 * found it returns 0 and in case of errors, a negative error code is returned.
2975 */
2976int of_genpd_parse_idle_states(struct device_node *dn,
2977 struct genpd_power_state **states, int *n)
2978{
2979 struct genpd_power_state *st;
2980 int ret;
2981
2982 ret = genpd_iterate_idle_states(dn, NULL);
2983 if (ret < 0)
2984 return ret;
2985
2986 if (!ret) {
2987 *states = NULL;
2988 *n = 0;
2989 return 0;
2990 }
2991
2992 st = kcalloc(ret, sizeof(*st), GFP_KERNEL);
2993 if (!st)
2994 return -ENOMEM;
2995
2996 ret = genpd_iterate_idle_states(dn, st);
2997 if (ret <= 0) {
2998 kfree(st);
2999 return ret < 0 ? ret : -EINVAL;
3000 }
3001
3002 *states = st;
3003 *n = ret;
3004
3005 return 0;
3006}
3007EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states);
3008
3009/**
3010 * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node.
3011 *
3012 * @genpd_dev: Genpd's device for which the performance-state needs to be found.
3013 * @opp: struct dev_pm_opp of the OPP for which we need to find performance
3014 * state.
3015 *
3016 * Returns performance state encoded in the OPP of the genpd. This calls
3017 * platform specific genpd->opp_to_performance_state() callback to translate
3018 * power domain OPP to performance state.
3019 *
3020 * Returns performance state on success and 0 on failure.
3021 */
3022unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev,
3023 struct dev_pm_opp *opp)
3024{
3025 struct generic_pm_domain *genpd = NULL;
3026 int state;
3027
3028 genpd = container_of(genpd_dev, struct generic_pm_domain, dev);
3029
3030 if (unlikely(!genpd->opp_to_performance_state))
3031 return 0;
3032
3033 genpd_lock(genpd);
3034 state = genpd->opp_to_performance_state(genpd, opp);
3035 genpd_unlock(genpd);
3036
3037 return state;
3038}
3039EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state);
3040
3041static int __init genpd_bus_init(void)
3042{
3043 return bus_register(&genpd_bus_type);
3044}
3045core_initcall(genpd_bus_init);
3046
3047#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
3048
3049
3050/*** debugfs support ***/
3051
3052#ifdef CONFIG_DEBUG_FS
3053/*
3054 * TODO: This function is a slightly modified version of rtpm_status_show
3055 * from sysfs.c, so generalize it.
3056 */
3057static void rtpm_status_str(struct seq_file *s, struct device *dev)
3058{
3059 static const char * const status_lookup[] = {
3060 [RPM_ACTIVE] = "active",
3061 [RPM_RESUMING] = "resuming",
3062 [RPM_SUSPENDED] = "suspended",
3063 [RPM_SUSPENDING] = "suspending"
3064 };
3065 const char *p = "";
3066
3067 if (dev->power.runtime_error)
3068 p = "error";
3069 else if (dev->power.disable_depth)
3070 p = "unsupported";
3071 else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup))
3072 p = status_lookup[dev->power.runtime_status];
3073 else
3074 WARN_ON(1);
3075
3076 seq_printf(s, "%-25s ", p);
3077}
3078
3079static void perf_status_str(struct seq_file *s, struct device *dev)
3080{
3081 struct generic_pm_domain_data *gpd_data;
3082
3083 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
3084 seq_put_decimal_ull(s, "", gpd_data->performance_state);
3085}
3086
3087static int genpd_summary_one(struct seq_file *s,
3088 struct generic_pm_domain *genpd)
3089{
3090 static const char * const status_lookup[] = {
3091 [GENPD_STATE_ON] = "on",
3092 [GENPD_STATE_OFF] = "off"
3093 };
3094 struct pm_domain_data *pm_data;
3095 const char *kobj_path;
3096 struct gpd_link *link;
3097 char state[16];
3098 int ret;
3099
3100 ret = genpd_lock_interruptible(genpd);
3101 if (ret)
3102 return -ERESTARTSYS;
3103
3104 if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup)))
3105 goto exit;
3106 if (!genpd_status_on(genpd))
3107 snprintf(state, sizeof(state), "%s-%u",
3108 status_lookup[genpd->status], genpd->state_idx);
3109 else
3110 snprintf(state, sizeof(state), "%s",
3111 status_lookup[genpd->status]);
3112 seq_printf(s, "%-30s %-50s %u", genpd->name, state, genpd->performance_state);
3113
3114 /*
3115 * Modifications on the list require holding locks on both
3116 * parent and child, so we are safe.
3117 * Also genpd->name is immutable.
3118 */
3119 list_for_each_entry(link, &genpd->parent_links, parent_node) {
3120 if (list_is_first(&link->parent_node, &genpd->parent_links))
3121 seq_printf(s, "\n%48s", " ");
3122 seq_printf(s, "%s", link->child->name);
3123 if (!list_is_last(&link->parent_node, &genpd->parent_links))
3124 seq_puts(s, ", ");
3125 }
3126
3127 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
3128 kobj_path = kobject_get_path(&pm_data->dev->kobj,
3129 genpd_is_irq_safe(genpd) ?
3130 GFP_ATOMIC : GFP_KERNEL);
3131 if (kobj_path == NULL)
3132 continue;
3133
3134 seq_printf(s, "\n %-50s ", kobj_path);
3135 rtpm_status_str(s, pm_data->dev);
3136 perf_status_str(s, pm_data->dev);
3137 kfree(kobj_path);
3138 }
3139
3140 seq_puts(s, "\n");
3141exit:
3142 genpd_unlock(genpd);
3143
3144 return 0;
3145}
3146
3147static int summary_show(struct seq_file *s, void *data)
3148{
3149 struct generic_pm_domain *genpd;
3150 int ret = 0;
3151
3152 seq_puts(s, "domain status children performance\n");
3153 seq_puts(s, " /device runtime status\n");
3154 seq_puts(s, "----------------------------------------------------------------------------------------------\n");
3155
3156 ret = mutex_lock_interruptible(&gpd_list_lock);
3157 if (ret)
3158 return -ERESTARTSYS;
3159
3160 list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
3161 ret = genpd_summary_one(s, genpd);
3162 if (ret)
3163 break;
3164 }
3165 mutex_unlock(&gpd_list_lock);
3166
3167 return ret;
3168}
3169
3170static int status_show(struct seq_file *s, void *data)
3171{
3172 static const char * const status_lookup[] = {
3173 [GENPD_STATE_ON] = "on",
3174 [GENPD_STATE_OFF] = "off"
3175 };
3176
3177 struct generic_pm_domain *genpd = s->private;
3178 int ret = 0;
3179
3180 ret = genpd_lock_interruptible(genpd);
3181 if (ret)
3182 return -ERESTARTSYS;
3183
3184 if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup)))
3185 goto exit;
3186
3187 if (genpd->status == GENPD_STATE_OFF)
3188 seq_printf(s, "%s-%u\n", status_lookup[genpd->status],
3189 genpd->state_idx);
3190 else
3191 seq_printf(s, "%s\n", status_lookup[genpd->status]);
3192exit:
3193 genpd_unlock(genpd);
3194 return ret;
3195}
3196
3197static int sub_domains_show(struct seq_file *s, void *data)
3198{
3199 struct generic_pm_domain *genpd = s->private;
3200 struct gpd_link *link;
3201 int ret = 0;
3202
3203 ret = genpd_lock_interruptible(genpd);
3204 if (ret)
3205 return -ERESTARTSYS;
3206
3207 list_for_each_entry(link, &genpd->parent_links, parent_node)
3208 seq_printf(s, "%s\n", link->child->name);
3209
3210 genpd_unlock(genpd);
3211 return ret;
3212}
3213
3214static int idle_states_show(struct seq_file *s, void *data)
3215{
3216 struct generic_pm_domain *genpd = s->private;
3217 u64 now, delta, idle_time = 0;
3218 unsigned int i;
3219 int ret = 0;
3220
3221 ret = genpd_lock_interruptible(genpd);
3222 if (ret)
3223 return -ERESTARTSYS;
3224
3225 seq_puts(s, "State Time Spent(ms) Usage Rejected\n");
3226
3227 for (i = 0; i < genpd->state_count; i++) {
3228 idle_time += genpd->states[i].idle_time;
3229
3230 if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) {
3231 now = ktime_get_mono_fast_ns();
3232 if (now > genpd->accounting_time) {
3233 delta = now - genpd->accounting_time;
3234 idle_time += delta;
3235 }
3236 }
3237
3238 do_div(idle_time, NSEC_PER_MSEC);
3239 seq_printf(s, "S%-13i %-14llu %-14llu %llu\n", i, idle_time,
3240 genpd->states[i].usage, genpd->states[i].rejected);
3241 }
3242
3243 genpd_unlock(genpd);
3244 return ret;
3245}
3246
3247static int active_time_show(struct seq_file *s, void *data)
3248{
3249 struct generic_pm_domain *genpd = s->private;
3250 u64 now, on_time, delta = 0;
3251 int ret = 0;
3252
3253 ret = genpd_lock_interruptible(genpd);
3254 if (ret)
3255 return -ERESTARTSYS;
3256
3257 if (genpd->status == GENPD_STATE_ON) {
3258 now = ktime_get_mono_fast_ns();
3259 if (now > genpd->accounting_time)
3260 delta = now - genpd->accounting_time;
3261 }
3262
3263 on_time = genpd->on_time + delta;
3264 do_div(on_time, NSEC_PER_MSEC);
3265 seq_printf(s, "%llu ms\n", on_time);
3266
3267 genpd_unlock(genpd);
3268 return ret;
3269}
3270
3271static int total_idle_time_show(struct seq_file *s, void *data)
3272{
3273 struct generic_pm_domain *genpd = s->private;
3274 u64 now, delta, total = 0;
3275 unsigned int i;
3276 int ret = 0;
3277
3278 ret = genpd_lock_interruptible(genpd);
3279 if (ret)
3280 return -ERESTARTSYS;
3281
3282 for (i = 0; i < genpd->state_count; i++) {
3283 total += genpd->states[i].idle_time;
3284
3285 if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) {
3286 now = ktime_get_mono_fast_ns();
3287 if (now > genpd->accounting_time) {
3288 delta = now - genpd->accounting_time;
3289 total += delta;
3290 }
3291 }
3292 }
3293
3294 do_div(total, NSEC_PER_MSEC);
3295 seq_printf(s, "%llu ms\n", total);
3296
3297 genpd_unlock(genpd);
3298 return ret;
3299}
3300
3301
3302static int devices_show(struct seq_file *s, void *data)
3303{
3304 struct generic_pm_domain *genpd = s->private;
3305 struct pm_domain_data *pm_data;
3306 const char *kobj_path;
3307 int ret = 0;
3308
3309 ret = genpd_lock_interruptible(genpd);
3310 if (ret)
3311 return -ERESTARTSYS;
3312
3313 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
3314 kobj_path = kobject_get_path(&pm_data->dev->kobj,
3315 genpd_is_irq_safe(genpd) ?
3316 GFP_ATOMIC : GFP_KERNEL);
3317 if (kobj_path == NULL)
3318 continue;
3319
3320 seq_printf(s, "%s\n", kobj_path);
3321 kfree(kobj_path);
3322 }
3323
3324 genpd_unlock(genpd);
3325 return ret;
3326}
3327
3328static int perf_state_show(struct seq_file *s, void *data)
3329{
3330 struct generic_pm_domain *genpd = s->private;
3331
3332 if (genpd_lock_interruptible(genpd))
3333 return -ERESTARTSYS;
3334
3335 seq_printf(s, "%u\n", genpd->performance_state);
3336
3337 genpd_unlock(genpd);
3338 return 0;
3339}
3340
3341DEFINE_SHOW_ATTRIBUTE(summary);
3342DEFINE_SHOW_ATTRIBUTE(status);
3343DEFINE_SHOW_ATTRIBUTE(sub_domains);
3344DEFINE_SHOW_ATTRIBUTE(idle_states);
3345DEFINE_SHOW_ATTRIBUTE(active_time);
3346DEFINE_SHOW_ATTRIBUTE(total_idle_time);
3347DEFINE_SHOW_ATTRIBUTE(devices);
3348DEFINE_SHOW_ATTRIBUTE(perf_state);
3349
3350static void genpd_debug_add(struct generic_pm_domain *genpd)
3351{
3352 struct dentry *d;
3353
3354 if (!genpd_debugfs_dir)
3355 return;
3356
3357 d = debugfs_create_dir(genpd->name, genpd_debugfs_dir);
3358
3359 debugfs_create_file("current_state", 0444,
3360 d, genpd, &status_fops);
3361 debugfs_create_file("sub_domains", 0444,
3362 d, genpd, &sub_domains_fops);
3363 debugfs_create_file("idle_states", 0444,
3364 d, genpd, &idle_states_fops);
3365 debugfs_create_file("active_time", 0444,
3366 d, genpd, &active_time_fops);
3367 debugfs_create_file("total_idle_time", 0444,
3368 d, genpd, &total_idle_time_fops);
3369 debugfs_create_file("devices", 0444,
3370 d, genpd, &devices_fops);
3371 if (genpd->set_performance_state)
3372 debugfs_create_file("perf_state", 0444,
3373 d, genpd, &perf_state_fops);
3374}
3375
3376static int __init genpd_debug_init(void)
3377{
3378 struct generic_pm_domain *genpd;
3379
3380 genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL);
3381
3382 debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir,
3383 NULL, &summary_fops);
3384
3385 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
3386 genpd_debug_add(genpd);
3387
3388 return 0;
3389}
3390late_initcall(genpd_debug_init);
3391
3392static void __exit genpd_debug_exit(void)
3393{
3394 debugfs_remove_recursive(genpd_debugfs_dir);
3395}
3396__exitcall(genpd_debug_exit);
3397#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/delay.h>
10#include <linux/kernel.h>
11#include <linux/io.h>
12#include <linux/platform_device.h>
13#include <linux/pm_runtime.h>
14#include <linux/pm_domain.h>
15#include <linux/pm_qos.h>
16#include <linux/pm_clock.h>
17#include <linux/slab.h>
18#include <linux/err.h>
19#include <linux/sched.h>
20#include <linux/suspend.h>
21#include <linux/export.h>
22
23#include "power.h"
24
25#define GENPD_RETRY_MAX_MS 250 /* Approximate */
26
27#define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \
28({ \
29 type (*__routine)(struct device *__d); \
30 type __ret = (type)0; \
31 \
32 __routine = genpd->dev_ops.callback; \
33 if (__routine) { \
34 __ret = __routine(dev); \
35 } \
36 __ret; \
37})
38
39static LIST_HEAD(gpd_list);
40static DEFINE_MUTEX(gpd_list_lock);
41
42struct genpd_lock_ops {
43 void (*lock)(struct generic_pm_domain *genpd);
44 void (*lock_nested)(struct generic_pm_domain *genpd, int depth);
45 int (*lock_interruptible)(struct generic_pm_domain *genpd);
46 void (*unlock)(struct generic_pm_domain *genpd);
47};
48
49static void genpd_lock_mtx(struct generic_pm_domain *genpd)
50{
51 mutex_lock(&genpd->mlock);
52}
53
54static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd,
55 int depth)
56{
57 mutex_lock_nested(&genpd->mlock, depth);
58}
59
60static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd)
61{
62 return mutex_lock_interruptible(&genpd->mlock);
63}
64
65static void genpd_unlock_mtx(struct generic_pm_domain *genpd)
66{
67 return mutex_unlock(&genpd->mlock);
68}
69
70static const struct genpd_lock_ops genpd_mtx_ops = {
71 .lock = genpd_lock_mtx,
72 .lock_nested = genpd_lock_nested_mtx,
73 .lock_interruptible = genpd_lock_interruptible_mtx,
74 .unlock = genpd_unlock_mtx,
75};
76
77static void genpd_lock_spin(struct generic_pm_domain *genpd)
78 __acquires(&genpd->slock)
79{
80 unsigned long flags;
81
82 spin_lock_irqsave(&genpd->slock, flags);
83 genpd->lock_flags = flags;
84}
85
86static void genpd_lock_nested_spin(struct generic_pm_domain *genpd,
87 int depth)
88 __acquires(&genpd->slock)
89{
90 unsigned long flags;
91
92 spin_lock_irqsave_nested(&genpd->slock, flags, depth);
93 genpd->lock_flags = flags;
94}
95
96static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd)
97 __acquires(&genpd->slock)
98{
99 unsigned long flags;
100
101 spin_lock_irqsave(&genpd->slock, flags);
102 genpd->lock_flags = flags;
103 return 0;
104}
105
106static void genpd_unlock_spin(struct generic_pm_domain *genpd)
107 __releases(&genpd->slock)
108{
109 spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags);
110}
111
112static const struct genpd_lock_ops genpd_spin_ops = {
113 .lock = genpd_lock_spin,
114 .lock_nested = genpd_lock_nested_spin,
115 .lock_interruptible = genpd_lock_interruptible_spin,
116 .unlock = genpd_unlock_spin,
117};
118
119#define genpd_lock(p) p->lock_ops->lock(p)
120#define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d)
121#define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p)
122#define genpd_unlock(p) p->lock_ops->unlock(p)
123
124#define genpd_status_on(genpd) (genpd->status == GPD_STATE_ACTIVE)
125#define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE)
126#define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON)
127#define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP)
128
129static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev,
130 const struct generic_pm_domain *genpd)
131{
132 bool ret;
133
134 ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd);
135
136 /*
137 * Warn once if an IRQ safe device is attached to a no sleep domain, as
138 * to indicate a suboptimal configuration for PM. For an always on
139 * domain this isn't case, thus don't warn.
140 */
141 if (ret && !genpd_is_always_on(genpd))
142 dev_warn_once(dev, "PM domain %s will not be powered off\n",
143 genpd->name);
144
145 return ret;
146}
147
148/*
149 * Get the generic PM domain for a particular struct device.
150 * This validates the struct device pointer, the PM domain pointer,
151 * and checks that the PM domain pointer is a real generic PM domain.
152 * Any failure results in NULL being returned.
153 */
154static struct generic_pm_domain *genpd_lookup_dev(struct device *dev)
155{
156 struct generic_pm_domain *genpd = NULL, *gpd;
157
158 if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain))
159 return NULL;
160
161 mutex_lock(&gpd_list_lock);
162 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
163 if (&gpd->domain == dev->pm_domain) {
164 genpd = gpd;
165 break;
166 }
167 }
168 mutex_unlock(&gpd_list_lock);
169
170 return genpd;
171}
172
173/*
174 * This should only be used where we are certain that the pm_domain
175 * attached to the device is a genpd domain.
176 */
177static struct generic_pm_domain *dev_to_genpd(struct device *dev)
178{
179 if (IS_ERR_OR_NULL(dev->pm_domain))
180 return ERR_PTR(-EINVAL);
181
182 return pd_to_genpd(dev->pm_domain);
183}
184
185static int genpd_stop_dev(const struct generic_pm_domain *genpd,
186 struct device *dev)
187{
188 return GENPD_DEV_CALLBACK(genpd, int, stop, dev);
189}
190
191static int genpd_start_dev(const struct generic_pm_domain *genpd,
192 struct device *dev)
193{
194 return GENPD_DEV_CALLBACK(genpd, int, start, dev);
195}
196
197static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
198{
199 bool ret = false;
200
201 if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
202 ret = !!atomic_dec_and_test(&genpd->sd_count);
203
204 return ret;
205}
206
207static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
208{
209 atomic_inc(&genpd->sd_count);
210 smp_mb__after_atomic();
211}
212
213#ifdef CONFIG_DEBUG_FS
214static void genpd_update_accounting(struct generic_pm_domain *genpd)
215{
216 ktime_t delta, now;
217
218 now = ktime_get();
219 delta = ktime_sub(now, genpd->accounting_time);
220
221 /*
222 * If genpd->status is active, it means we are just
223 * out of off and so update the idle time and vice
224 * versa.
225 */
226 if (genpd->status == GPD_STATE_ACTIVE) {
227 int state_idx = genpd->state_idx;
228
229 genpd->states[state_idx].idle_time =
230 ktime_add(genpd->states[state_idx].idle_time, delta);
231 } else {
232 genpd->on_time = ktime_add(genpd->on_time, delta);
233 }
234
235 genpd->accounting_time = now;
236}
237#else
238static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {}
239#endif
240
241/**
242 * dev_pm_genpd_set_performance_state- Set performance state of device's power
243 * domain.
244 *
245 * @dev: Device for which the performance-state needs to be set.
246 * @state: Target performance state of the device. This can be set as 0 when the
247 * device doesn't have any performance state constraints left (And so
248 * the device wouldn't participate anymore to find the target
249 * performance state of the genpd).
250 *
251 * It is assumed that the users guarantee that the genpd wouldn't be detached
252 * while this routine is getting called.
253 *
254 * Returns 0 on success and negative error values on failures.
255 */
256int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
257{
258 struct generic_pm_domain *genpd;
259 struct generic_pm_domain_data *gpd_data, *pd_data;
260 struct pm_domain_data *pdd;
261 unsigned int prev;
262 int ret = 0;
263
264 genpd = dev_to_genpd(dev);
265 if (IS_ERR(genpd))
266 return -ENODEV;
267
268 if (unlikely(!genpd->set_performance_state))
269 return -EINVAL;
270
271 if (unlikely(!dev->power.subsys_data ||
272 !dev->power.subsys_data->domain_data)) {
273 WARN_ON(1);
274 return -EINVAL;
275 }
276
277 genpd_lock(genpd);
278
279 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
280 prev = gpd_data->performance_state;
281 gpd_data->performance_state = state;
282
283 /* New requested state is same as Max requested state */
284 if (state == genpd->performance_state)
285 goto unlock;
286
287 /* New requested state is higher than Max requested state */
288 if (state > genpd->performance_state)
289 goto update_state;
290
291 /* Traverse all devices within the domain */
292 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
293 pd_data = to_gpd_data(pdd);
294
295 if (pd_data->performance_state > state)
296 state = pd_data->performance_state;
297 }
298
299 if (state == genpd->performance_state)
300 goto unlock;
301
302 /*
303 * We aren't propagating performance state changes of a subdomain to its
304 * masters as we don't have hardware that needs it. Over that, the
305 * performance states of subdomain and its masters may not have
306 * one-to-one mapping and would require additional information. We can
307 * get back to this once we have hardware that needs it. For that
308 * reason, we don't have to consider performance state of the subdomains
309 * of genpd here.
310 */
311
312update_state:
313 if (genpd_status_on(genpd)) {
314 ret = genpd->set_performance_state(genpd, state);
315 if (ret) {
316 gpd_data->performance_state = prev;
317 goto unlock;
318 }
319 }
320
321 genpd->performance_state = state;
322
323unlock:
324 genpd_unlock(genpd);
325
326 return ret;
327}
328EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state);
329
330static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
331{
332 unsigned int state_idx = genpd->state_idx;
333 ktime_t time_start;
334 s64 elapsed_ns;
335 int ret;
336
337 if (!genpd->power_on)
338 return 0;
339
340 if (!timed)
341 return genpd->power_on(genpd);
342
343 time_start = ktime_get();
344 ret = genpd->power_on(genpd);
345 if (ret)
346 return ret;
347
348 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
349
350 if (unlikely(genpd->set_performance_state)) {
351 ret = genpd->set_performance_state(genpd, genpd->performance_state);
352 if (ret) {
353 pr_warn("%s: Failed to set performance state %d (%d)\n",
354 genpd->name, genpd->performance_state, ret);
355 }
356 }
357
358 if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns)
359 return ret;
360
361 genpd->states[state_idx].power_on_latency_ns = elapsed_ns;
362 genpd->max_off_time_changed = true;
363 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
364 genpd->name, "on", elapsed_ns);
365
366 return ret;
367}
368
369static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed)
370{
371 unsigned int state_idx = genpd->state_idx;
372 ktime_t time_start;
373 s64 elapsed_ns;
374 int ret;
375
376 if (!genpd->power_off)
377 return 0;
378
379 if (!timed)
380 return genpd->power_off(genpd);
381
382 time_start = ktime_get();
383 ret = genpd->power_off(genpd);
384 if (ret == -EBUSY)
385 return ret;
386
387 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
388 if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns)
389 return ret;
390
391 genpd->states[state_idx].power_off_latency_ns = elapsed_ns;
392 genpd->max_off_time_changed = true;
393 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
394 genpd->name, "off", elapsed_ns);
395
396 return ret;
397}
398
399/**
400 * genpd_queue_power_off_work - Queue up the execution of genpd_power_off().
401 * @genpd: PM domain to power off.
402 *
403 * Queue up the execution of genpd_power_off() unless it's already been done
404 * before.
405 */
406static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
407{
408 queue_work(pm_wq, &genpd->power_off_work);
409}
410
411/**
412 * genpd_power_off - Remove power from a given PM domain.
413 * @genpd: PM domain to power down.
414 * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the
415 * RPM status of the releated device is in an intermediate state, not yet turned
416 * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not
417 * be RPM_SUSPENDED, while it tries to power off the PM domain.
418 *
419 * If all of the @genpd's devices have been suspended and all of its subdomains
420 * have been powered down, remove power from @genpd.
421 */
422static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
423 unsigned int depth)
424{
425 struct pm_domain_data *pdd;
426 struct gpd_link *link;
427 unsigned int not_suspended = 0;
428
429 /*
430 * Do not try to power off the domain in the following situations:
431 * (1) The domain is already in the "power off" state.
432 * (2) System suspend is in progress.
433 */
434 if (!genpd_status_on(genpd) || genpd->prepared_count > 0)
435 return 0;
436
437 /*
438 * Abort power off for the PM domain in the following situations:
439 * (1) The domain is configured as always on.
440 * (2) When the domain has a subdomain being powered on.
441 */
442 if (genpd_is_always_on(genpd) || atomic_read(&genpd->sd_count) > 0)
443 return -EBUSY;
444
445 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
446 enum pm_qos_flags_status stat;
447
448 stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF);
449 if (stat > PM_QOS_FLAGS_NONE)
450 return -EBUSY;
451
452 /*
453 * Do not allow PM domain to be powered off, when an IRQ safe
454 * device is part of a non-IRQ safe domain.
455 */
456 if (!pm_runtime_suspended(pdd->dev) ||
457 irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd))
458 not_suspended++;
459 }
460
461 if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on))
462 return -EBUSY;
463
464 if (genpd->gov && genpd->gov->power_down_ok) {
465 if (!genpd->gov->power_down_ok(&genpd->domain))
466 return -EAGAIN;
467 }
468
469 if (genpd->power_off) {
470 int ret;
471
472 if (atomic_read(&genpd->sd_count) > 0)
473 return -EBUSY;
474
475 /*
476 * If sd_count > 0 at this point, one of the subdomains hasn't
477 * managed to call genpd_power_on() for the master yet after
478 * incrementing it. In that case genpd_power_on() will wait
479 * for us to drop the lock, so we can call .power_off() and let
480 * the genpd_power_on() restore power for us (this shouldn't
481 * happen very often).
482 */
483 ret = _genpd_power_off(genpd, true);
484 if (ret)
485 return ret;
486 }
487
488 genpd->status = GPD_STATE_POWER_OFF;
489 genpd_update_accounting(genpd);
490
491 list_for_each_entry(link, &genpd->slave_links, slave_node) {
492 genpd_sd_counter_dec(link->master);
493 genpd_lock_nested(link->master, depth + 1);
494 genpd_power_off(link->master, false, depth + 1);
495 genpd_unlock(link->master);
496 }
497
498 return 0;
499}
500
501/**
502 * genpd_power_on - Restore power to a given PM domain and its masters.
503 * @genpd: PM domain to power up.
504 * @depth: nesting count for lockdep.
505 *
506 * Restore power to @genpd and all of its masters so that it is possible to
507 * resume a device belonging to it.
508 */
509static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth)
510{
511 struct gpd_link *link;
512 int ret = 0;
513
514 if (genpd_status_on(genpd))
515 return 0;
516
517 /*
518 * The list is guaranteed not to change while the loop below is being
519 * executed, unless one of the masters' .power_on() callbacks fiddles
520 * with it.
521 */
522 list_for_each_entry(link, &genpd->slave_links, slave_node) {
523 struct generic_pm_domain *master = link->master;
524
525 genpd_sd_counter_inc(master);
526
527 genpd_lock_nested(master, depth + 1);
528 ret = genpd_power_on(master, depth + 1);
529 genpd_unlock(master);
530
531 if (ret) {
532 genpd_sd_counter_dec(master);
533 goto err;
534 }
535 }
536
537 ret = _genpd_power_on(genpd, true);
538 if (ret)
539 goto err;
540
541 genpd->status = GPD_STATE_ACTIVE;
542 genpd_update_accounting(genpd);
543
544 return 0;
545
546 err:
547 list_for_each_entry_continue_reverse(link,
548 &genpd->slave_links,
549 slave_node) {
550 genpd_sd_counter_dec(link->master);
551 genpd_lock_nested(link->master, depth + 1);
552 genpd_power_off(link->master, false, depth + 1);
553 genpd_unlock(link->master);
554 }
555
556 return ret;
557}
558
559static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
560 unsigned long val, void *ptr)
561{
562 struct generic_pm_domain_data *gpd_data;
563 struct device *dev;
564
565 gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
566 dev = gpd_data->base.dev;
567
568 for (;;) {
569 struct generic_pm_domain *genpd;
570 struct pm_domain_data *pdd;
571
572 spin_lock_irq(&dev->power.lock);
573
574 pdd = dev->power.subsys_data ?
575 dev->power.subsys_data->domain_data : NULL;
576 if (pdd) {
577 to_gpd_data(pdd)->td.constraint_changed = true;
578 genpd = dev_to_genpd(dev);
579 } else {
580 genpd = ERR_PTR(-ENODATA);
581 }
582
583 spin_unlock_irq(&dev->power.lock);
584
585 if (!IS_ERR(genpd)) {
586 genpd_lock(genpd);
587 genpd->max_off_time_changed = true;
588 genpd_unlock(genpd);
589 }
590
591 dev = dev->parent;
592 if (!dev || dev->power.ignore_children)
593 break;
594 }
595
596 return NOTIFY_DONE;
597}
598
599/**
600 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
601 * @work: Work structure used for scheduling the execution of this function.
602 */
603static void genpd_power_off_work_fn(struct work_struct *work)
604{
605 struct generic_pm_domain *genpd;
606
607 genpd = container_of(work, struct generic_pm_domain, power_off_work);
608
609 genpd_lock(genpd);
610 genpd_power_off(genpd, false, 0);
611 genpd_unlock(genpd);
612}
613
614/**
615 * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks
616 * @dev: Device to handle.
617 */
618static int __genpd_runtime_suspend(struct device *dev)
619{
620 int (*cb)(struct device *__dev);
621
622 if (dev->type && dev->type->pm)
623 cb = dev->type->pm->runtime_suspend;
624 else if (dev->class && dev->class->pm)
625 cb = dev->class->pm->runtime_suspend;
626 else if (dev->bus && dev->bus->pm)
627 cb = dev->bus->pm->runtime_suspend;
628 else
629 cb = NULL;
630
631 if (!cb && dev->driver && dev->driver->pm)
632 cb = dev->driver->pm->runtime_suspend;
633
634 return cb ? cb(dev) : 0;
635}
636
637/**
638 * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks
639 * @dev: Device to handle.
640 */
641static int __genpd_runtime_resume(struct device *dev)
642{
643 int (*cb)(struct device *__dev);
644
645 if (dev->type && dev->type->pm)
646 cb = dev->type->pm->runtime_resume;
647 else if (dev->class && dev->class->pm)
648 cb = dev->class->pm->runtime_resume;
649 else if (dev->bus && dev->bus->pm)
650 cb = dev->bus->pm->runtime_resume;
651 else
652 cb = NULL;
653
654 if (!cb && dev->driver && dev->driver->pm)
655 cb = dev->driver->pm->runtime_resume;
656
657 return cb ? cb(dev) : 0;
658}
659
660/**
661 * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
662 * @dev: Device to suspend.
663 *
664 * Carry out a runtime suspend of a device under the assumption that its
665 * pm_domain field points to the domain member of an object of type
666 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
667 */
668static int genpd_runtime_suspend(struct device *dev)
669{
670 struct generic_pm_domain *genpd;
671 bool (*suspend_ok)(struct device *__dev);
672 struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
673 bool runtime_pm = pm_runtime_enabled(dev);
674 ktime_t time_start;
675 s64 elapsed_ns;
676 int ret;
677
678 dev_dbg(dev, "%s()\n", __func__);
679
680 genpd = dev_to_genpd(dev);
681 if (IS_ERR(genpd))
682 return -EINVAL;
683
684 /*
685 * A runtime PM centric subsystem/driver may re-use the runtime PM
686 * callbacks for other purposes than runtime PM. In those scenarios
687 * runtime PM is disabled. Under these circumstances, we shall skip
688 * validating/measuring the PM QoS latency.
689 */
690 suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL;
691 if (runtime_pm && suspend_ok && !suspend_ok(dev))
692 return -EBUSY;
693
694 /* Measure suspend latency. */
695 time_start = 0;
696 if (runtime_pm)
697 time_start = ktime_get();
698
699 ret = __genpd_runtime_suspend(dev);
700 if (ret)
701 return ret;
702
703 ret = genpd_stop_dev(genpd, dev);
704 if (ret) {
705 __genpd_runtime_resume(dev);
706 return ret;
707 }
708
709 /* Update suspend latency value if the measured time exceeds it. */
710 if (runtime_pm) {
711 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
712 if (elapsed_ns > td->suspend_latency_ns) {
713 td->suspend_latency_ns = elapsed_ns;
714 dev_dbg(dev, "suspend latency exceeded, %lld ns\n",
715 elapsed_ns);
716 genpd->max_off_time_changed = true;
717 td->constraint_changed = true;
718 }
719 }
720
721 /*
722 * If power.irq_safe is set, this routine may be run with
723 * IRQs disabled, so suspend only if the PM domain also is irq_safe.
724 */
725 if (irq_safe_dev_in_no_sleep_domain(dev, genpd))
726 return 0;
727
728 genpd_lock(genpd);
729 genpd_power_off(genpd, true, 0);
730 genpd_unlock(genpd);
731
732 return 0;
733}
734
735/**
736 * genpd_runtime_resume - Resume a device belonging to I/O PM domain.
737 * @dev: Device to resume.
738 *
739 * Carry out a runtime resume of a device under the assumption that its
740 * pm_domain field points to the domain member of an object of type
741 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
742 */
743static int genpd_runtime_resume(struct device *dev)
744{
745 struct generic_pm_domain *genpd;
746 struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
747 bool runtime_pm = pm_runtime_enabled(dev);
748 ktime_t time_start;
749 s64 elapsed_ns;
750 int ret;
751 bool timed = true;
752
753 dev_dbg(dev, "%s()\n", __func__);
754
755 genpd = dev_to_genpd(dev);
756 if (IS_ERR(genpd))
757 return -EINVAL;
758
759 /*
760 * As we don't power off a non IRQ safe domain, which holds
761 * an IRQ safe device, we don't need to restore power to it.
762 */
763 if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) {
764 timed = false;
765 goto out;
766 }
767
768 genpd_lock(genpd);
769 ret = genpd_power_on(genpd, 0);
770 genpd_unlock(genpd);
771
772 if (ret)
773 return ret;
774
775 out:
776 /* Measure resume latency. */
777 time_start = 0;
778 if (timed && runtime_pm)
779 time_start = ktime_get();
780
781 ret = genpd_start_dev(genpd, dev);
782 if (ret)
783 goto err_poweroff;
784
785 ret = __genpd_runtime_resume(dev);
786 if (ret)
787 goto err_stop;
788
789 /* Update resume latency value if the measured time exceeds it. */
790 if (timed && runtime_pm) {
791 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
792 if (elapsed_ns > td->resume_latency_ns) {
793 td->resume_latency_ns = elapsed_ns;
794 dev_dbg(dev, "resume latency exceeded, %lld ns\n",
795 elapsed_ns);
796 genpd->max_off_time_changed = true;
797 td->constraint_changed = true;
798 }
799 }
800
801 return 0;
802
803err_stop:
804 genpd_stop_dev(genpd, dev);
805err_poweroff:
806 if (!pm_runtime_is_irq_safe(dev) ||
807 (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) {
808 genpd_lock(genpd);
809 genpd_power_off(genpd, true, 0);
810 genpd_unlock(genpd);
811 }
812
813 return ret;
814}
815
816static bool pd_ignore_unused;
817static int __init pd_ignore_unused_setup(char *__unused)
818{
819 pd_ignore_unused = true;
820 return 1;
821}
822__setup("pd_ignore_unused", pd_ignore_unused_setup);
823
824/**
825 * genpd_power_off_unused - Power off all PM domains with no devices in use.
826 */
827static int __init genpd_power_off_unused(void)
828{
829 struct generic_pm_domain *genpd;
830
831 if (pd_ignore_unused) {
832 pr_warn("genpd: Not disabling unused power domains\n");
833 return 0;
834 }
835
836 mutex_lock(&gpd_list_lock);
837
838 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
839 genpd_queue_power_off_work(genpd);
840
841 mutex_unlock(&gpd_list_lock);
842
843 return 0;
844}
845late_initcall(genpd_power_off_unused);
846
847#if defined(CONFIG_PM_SLEEP) || defined(CONFIG_PM_GENERIC_DOMAINS_OF)
848
849static bool genpd_present(const struct generic_pm_domain *genpd)
850{
851 const struct generic_pm_domain *gpd;
852
853 if (IS_ERR_OR_NULL(genpd))
854 return false;
855
856 list_for_each_entry(gpd, &gpd_list, gpd_list_node)
857 if (gpd == genpd)
858 return true;
859
860 return false;
861}
862
863#endif
864
865#ifdef CONFIG_PM_SLEEP
866
867/**
868 * genpd_sync_power_off - Synchronously power off a PM domain and its masters.
869 * @genpd: PM domain to power off, if possible.
870 * @use_lock: use the lock.
871 * @depth: nesting count for lockdep.
872 *
873 * Check if the given PM domain can be powered off (during system suspend or
874 * hibernation) and do that if so. Also, in that case propagate to its masters.
875 *
876 * This function is only called in "noirq" and "syscore" stages of system power
877 * transitions. The "noirq" callbacks may be executed asynchronously, thus in
878 * these cases the lock must be held.
879 */
880static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock,
881 unsigned int depth)
882{
883 struct gpd_link *link;
884
885 if (!genpd_status_on(genpd) || genpd_is_always_on(genpd))
886 return;
887
888 if (genpd->suspended_count != genpd->device_count
889 || atomic_read(&genpd->sd_count) > 0)
890 return;
891
892 /* Choose the deepest state when suspending */
893 genpd->state_idx = genpd->state_count - 1;
894 if (_genpd_power_off(genpd, false))
895 return;
896
897 genpd->status = GPD_STATE_POWER_OFF;
898
899 list_for_each_entry(link, &genpd->slave_links, slave_node) {
900 genpd_sd_counter_dec(link->master);
901
902 if (use_lock)
903 genpd_lock_nested(link->master, depth + 1);
904
905 genpd_sync_power_off(link->master, use_lock, depth + 1);
906
907 if (use_lock)
908 genpd_unlock(link->master);
909 }
910}
911
912/**
913 * genpd_sync_power_on - Synchronously power on a PM domain and its masters.
914 * @genpd: PM domain to power on.
915 * @use_lock: use the lock.
916 * @depth: nesting count for lockdep.
917 *
918 * This function is only called in "noirq" and "syscore" stages of system power
919 * transitions. The "noirq" callbacks may be executed asynchronously, thus in
920 * these cases the lock must be held.
921 */
922static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock,
923 unsigned int depth)
924{
925 struct gpd_link *link;
926
927 if (genpd_status_on(genpd))
928 return;
929
930 list_for_each_entry(link, &genpd->slave_links, slave_node) {
931 genpd_sd_counter_inc(link->master);
932
933 if (use_lock)
934 genpd_lock_nested(link->master, depth + 1);
935
936 genpd_sync_power_on(link->master, use_lock, depth + 1);
937
938 if (use_lock)
939 genpd_unlock(link->master);
940 }
941
942 _genpd_power_on(genpd, false);
943
944 genpd->status = GPD_STATE_ACTIVE;
945}
946
947/**
948 * resume_needed - Check whether to resume a device before system suspend.
949 * @dev: Device to check.
950 * @genpd: PM domain the device belongs to.
951 *
952 * There are two cases in which a device that can wake up the system from sleep
953 * states should be resumed by genpd_prepare(): (1) if the device is enabled
954 * to wake up the system and it has to remain active for this purpose while the
955 * system is in the sleep state and (2) if the device is not enabled to wake up
956 * the system from sleep states and it generally doesn't generate wakeup signals
957 * by itself (those signals are generated on its behalf by other parts of the
958 * system). In the latter case it may be necessary to reconfigure the device's
959 * wakeup settings during system suspend, because it may have been set up to
960 * signal remote wakeup from the system's working state as needed by runtime PM.
961 * Return 'true' in either of the above cases.
962 */
963static bool resume_needed(struct device *dev,
964 const struct generic_pm_domain *genpd)
965{
966 bool active_wakeup;
967
968 if (!device_can_wakeup(dev))
969 return false;
970
971 active_wakeup = genpd_is_active_wakeup(genpd);
972 return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
973}
974
975/**
976 * genpd_prepare - Start power transition of a device in a PM domain.
977 * @dev: Device to start the transition of.
978 *
979 * Start a power transition of a device (during a system-wide power transition)
980 * under the assumption that its pm_domain field points to the domain member of
981 * an object of type struct generic_pm_domain representing a PM domain
982 * consisting of I/O devices.
983 */
984static int genpd_prepare(struct device *dev)
985{
986 struct generic_pm_domain *genpd;
987 int ret;
988
989 dev_dbg(dev, "%s()\n", __func__);
990
991 genpd = dev_to_genpd(dev);
992 if (IS_ERR(genpd))
993 return -EINVAL;
994
995 /*
996 * If a wakeup request is pending for the device, it should be woken up
997 * at this point and a system wakeup event should be reported if it's
998 * set up to wake up the system from sleep states.
999 */
1000 if (resume_needed(dev, genpd))
1001 pm_runtime_resume(dev);
1002
1003 genpd_lock(genpd);
1004
1005 if (genpd->prepared_count++ == 0)
1006 genpd->suspended_count = 0;
1007
1008 genpd_unlock(genpd);
1009
1010 ret = pm_generic_prepare(dev);
1011 if (ret < 0) {
1012 genpd_lock(genpd);
1013
1014 genpd->prepared_count--;
1015
1016 genpd_unlock(genpd);
1017 }
1018
1019 /* Never return 1, as genpd don't cope with the direct_complete path. */
1020 return ret >= 0 ? 0 : ret;
1021}
1022
1023/**
1024 * genpd_finish_suspend - Completion of suspend or hibernation of device in an
1025 * I/O pm domain.
1026 * @dev: Device to suspend.
1027 * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback.
1028 *
1029 * Stop the device and remove power from the domain if all devices in it have
1030 * been stopped.
1031 */
1032static int genpd_finish_suspend(struct device *dev, bool poweroff)
1033{
1034 struct generic_pm_domain *genpd;
1035 int ret = 0;
1036
1037 genpd = dev_to_genpd(dev);
1038 if (IS_ERR(genpd))
1039 return -EINVAL;
1040
1041 if (poweroff)
1042 ret = pm_generic_poweroff_noirq(dev);
1043 else
1044 ret = pm_generic_suspend_noirq(dev);
1045 if (ret)
1046 return ret;
1047
1048 if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd))
1049 return 0;
1050
1051 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1052 !pm_runtime_status_suspended(dev)) {
1053 ret = genpd_stop_dev(genpd, dev);
1054 if (ret) {
1055 if (poweroff)
1056 pm_generic_restore_noirq(dev);
1057 else
1058 pm_generic_resume_noirq(dev);
1059 return ret;
1060 }
1061 }
1062
1063 genpd_lock(genpd);
1064 genpd->suspended_count++;
1065 genpd_sync_power_off(genpd, true, 0);
1066 genpd_unlock(genpd);
1067
1068 return 0;
1069}
1070
1071/**
1072 * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
1073 * @dev: Device to suspend.
1074 *
1075 * Stop the device and remove power from the domain if all devices in it have
1076 * been stopped.
1077 */
1078static int genpd_suspend_noirq(struct device *dev)
1079{
1080 dev_dbg(dev, "%s()\n", __func__);
1081
1082 return genpd_finish_suspend(dev, false);
1083}
1084
1085/**
1086 * genpd_resume_noirq - Start of resume of device in an I/O PM domain.
1087 * @dev: Device to resume.
1088 *
1089 * Restore power to the device's PM domain, if necessary, and start the device.
1090 */
1091static int genpd_resume_noirq(struct device *dev)
1092{
1093 struct generic_pm_domain *genpd;
1094 int ret;
1095
1096 dev_dbg(dev, "%s()\n", __func__);
1097
1098 genpd = dev_to_genpd(dev);
1099 if (IS_ERR(genpd))
1100 return -EINVAL;
1101
1102 if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd))
1103 return pm_generic_resume_noirq(dev);
1104
1105 genpd_lock(genpd);
1106 genpd_sync_power_on(genpd, true, 0);
1107 genpd->suspended_count--;
1108 genpd_unlock(genpd);
1109
1110 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1111 !pm_runtime_status_suspended(dev)) {
1112 ret = genpd_start_dev(genpd, dev);
1113 if (ret)
1114 return ret;
1115 }
1116
1117 return pm_generic_resume_noirq(dev);
1118}
1119
1120/**
1121 * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
1122 * @dev: Device to freeze.
1123 *
1124 * Carry out a late freeze of a device under the assumption that its
1125 * pm_domain field points to the domain member of an object of type
1126 * struct generic_pm_domain representing a power domain consisting of I/O
1127 * devices.
1128 */
1129static int genpd_freeze_noirq(struct device *dev)
1130{
1131 const struct generic_pm_domain *genpd;
1132 int ret = 0;
1133
1134 dev_dbg(dev, "%s()\n", __func__);
1135
1136 genpd = dev_to_genpd(dev);
1137 if (IS_ERR(genpd))
1138 return -EINVAL;
1139
1140 ret = pm_generic_freeze_noirq(dev);
1141 if (ret)
1142 return ret;
1143
1144 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1145 !pm_runtime_status_suspended(dev))
1146 ret = genpd_stop_dev(genpd, dev);
1147
1148 return ret;
1149}
1150
1151/**
1152 * genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
1153 * @dev: Device to thaw.
1154 *
1155 * Start the device, unless power has been removed from the domain already
1156 * before the system transition.
1157 */
1158static int genpd_thaw_noirq(struct device *dev)
1159{
1160 const struct generic_pm_domain *genpd;
1161 int ret = 0;
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 (genpd->dev_ops.stop && genpd->dev_ops.start &&
1170 !pm_runtime_status_suspended(dev)) {
1171 ret = genpd_start_dev(genpd, dev);
1172 if (ret)
1173 return ret;
1174 }
1175
1176 return pm_generic_thaw_noirq(dev);
1177}
1178
1179/**
1180 * genpd_poweroff_noirq - Completion of hibernation of device in an
1181 * I/O PM domain.
1182 * @dev: Device to poweroff.
1183 *
1184 * Stop the device and remove power from the domain if all devices in it have
1185 * been stopped.
1186 */
1187static int genpd_poweroff_noirq(struct device *dev)
1188{
1189 dev_dbg(dev, "%s()\n", __func__);
1190
1191 return genpd_finish_suspend(dev, true);
1192}
1193
1194/**
1195 * genpd_restore_noirq - Start of restore of device in an I/O PM domain.
1196 * @dev: Device to resume.
1197 *
1198 * Make sure the domain will be in the same power state as before the
1199 * hibernation the system is resuming from and start the device if necessary.
1200 */
1201static int genpd_restore_noirq(struct device *dev)
1202{
1203 struct generic_pm_domain *genpd;
1204 int ret = 0;
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 /*
1213 * At this point suspended_count == 0 means we are being run for the
1214 * first time for the given domain in the present cycle.
1215 */
1216 genpd_lock(genpd);
1217 if (genpd->suspended_count++ == 0)
1218 /*
1219 * The boot kernel might put the domain into arbitrary state,
1220 * so make it appear as powered off to genpd_sync_power_on(),
1221 * so that it tries to power it on in case it was really off.
1222 */
1223 genpd->status = GPD_STATE_POWER_OFF;
1224
1225 genpd_sync_power_on(genpd, true, 0);
1226 genpd_unlock(genpd);
1227
1228 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1229 !pm_runtime_status_suspended(dev)) {
1230 ret = genpd_start_dev(genpd, dev);
1231 if (ret)
1232 return ret;
1233 }
1234
1235 return pm_generic_restore_noirq(dev);
1236}
1237
1238/**
1239 * genpd_complete - Complete power transition of a device in a power domain.
1240 * @dev: Device to complete the transition of.
1241 *
1242 * Complete a power transition of a device (during a system-wide power
1243 * transition) under the assumption that its pm_domain field points to the
1244 * domain member of an object of type struct generic_pm_domain representing
1245 * a power domain consisting of I/O devices.
1246 */
1247static void genpd_complete(struct device *dev)
1248{
1249 struct generic_pm_domain *genpd;
1250
1251 dev_dbg(dev, "%s()\n", __func__);
1252
1253 genpd = dev_to_genpd(dev);
1254 if (IS_ERR(genpd))
1255 return;
1256
1257 pm_generic_complete(dev);
1258
1259 genpd_lock(genpd);
1260
1261 genpd->prepared_count--;
1262 if (!genpd->prepared_count)
1263 genpd_queue_power_off_work(genpd);
1264
1265 genpd_unlock(genpd);
1266}
1267
1268/**
1269 * genpd_syscore_switch - Switch power during system core suspend or resume.
1270 * @dev: Device that normally is marked as "always on" to switch power for.
1271 *
1272 * This routine may only be called during the system core (syscore) suspend or
1273 * resume phase for devices whose "always on" flags are set.
1274 */
1275static void genpd_syscore_switch(struct device *dev, bool suspend)
1276{
1277 struct generic_pm_domain *genpd;
1278
1279 genpd = dev_to_genpd(dev);
1280 if (!genpd_present(genpd))
1281 return;
1282
1283 if (suspend) {
1284 genpd->suspended_count++;
1285 genpd_sync_power_off(genpd, false, 0);
1286 } else {
1287 genpd_sync_power_on(genpd, false, 0);
1288 genpd->suspended_count--;
1289 }
1290}
1291
1292void pm_genpd_syscore_poweroff(struct device *dev)
1293{
1294 genpd_syscore_switch(dev, true);
1295}
1296EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff);
1297
1298void pm_genpd_syscore_poweron(struct device *dev)
1299{
1300 genpd_syscore_switch(dev, false);
1301}
1302EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron);
1303
1304#else /* !CONFIG_PM_SLEEP */
1305
1306#define genpd_prepare NULL
1307#define genpd_suspend_noirq NULL
1308#define genpd_resume_noirq NULL
1309#define genpd_freeze_noirq NULL
1310#define genpd_thaw_noirq NULL
1311#define genpd_poweroff_noirq NULL
1312#define genpd_restore_noirq NULL
1313#define genpd_complete NULL
1314
1315#endif /* CONFIG_PM_SLEEP */
1316
1317static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev,
1318 struct generic_pm_domain *genpd,
1319 struct gpd_timing_data *td)
1320{
1321 struct generic_pm_domain_data *gpd_data;
1322 int ret;
1323
1324 ret = dev_pm_get_subsys_data(dev);
1325 if (ret)
1326 return ERR_PTR(ret);
1327
1328 gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
1329 if (!gpd_data) {
1330 ret = -ENOMEM;
1331 goto err_put;
1332 }
1333
1334 if (td)
1335 gpd_data->td = *td;
1336
1337 gpd_data->base.dev = dev;
1338 gpd_data->td.constraint_changed = true;
1339 gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS;
1340 gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
1341
1342 spin_lock_irq(&dev->power.lock);
1343
1344 if (dev->power.subsys_data->domain_data) {
1345 ret = -EINVAL;
1346 goto err_free;
1347 }
1348
1349 dev->power.subsys_data->domain_data = &gpd_data->base;
1350
1351 spin_unlock_irq(&dev->power.lock);
1352
1353 return gpd_data;
1354
1355 err_free:
1356 spin_unlock_irq(&dev->power.lock);
1357 kfree(gpd_data);
1358 err_put:
1359 dev_pm_put_subsys_data(dev);
1360 return ERR_PTR(ret);
1361}
1362
1363static void genpd_free_dev_data(struct device *dev,
1364 struct generic_pm_domain_data *gpd_data)
1365{
1366 spin_lock_irq(&dev->power.lock);
1367
1368 dev->power.subsys_data->domain_data = NULL;
1369
1370 spin_unlock_irq(&dev->power.lock);
1371
1372 kfree(gpd_data);
1373 dev_pm_put_subsys_data(dev);
1374}
1375
1376static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
1377 struct gpd_timing_data *td)
1378{
1379 struct generic_pm_domain_data *gpd_data;
1380 int ret = 0;
1381
1382 dev_dbg(dev, "%s()\n", __func__);
1383
1384 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
1385 return -EINVAL;
1386
1387 gpd_data = genpd_alloc_dev_data(dev, genpd, td);
1388 if (IS_ERR(gpd_data))
1389 return PTR_ERR(gpd_data);
1390
1391 genpd_lock(genpd);
1392
1393 if (genpd->prepared_count > 0) {
1394 ret = -EAGAIN;
1395 goto out;
1396 }
1397
1398 ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
1399 if (ret)
1400 goto out;
1401
1402 dev_pm_domain_set(dev, &genpd->domain);
1403
1404 genpd->device_count++;
1405 genpd->max_off_time_changed = true;
1406
1407 list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
1408
1409 out:
1410 genpd_unlock(genpd);
1411
1412 if (ret)
1413 genpd_free_dev_data(dev, gpd_data);
1414 else
1415 dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1416
1417 return ret;
1418}
1419
1420/**
1421 * __pm_genpd_add_device - Add a device to an I/O PM domain.
1422 * @genpd: PM domain to add the device to.
1423 * @dev: Device to be added.
1424 * @td: Set of PM QoS timing parameters to attach to the device.
1425 */
1426int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
1427 struct gpd_timing_data *td)
1428{
1429 int ret;
1430
1431 mutex_lock(&gpd_list_lock);
1432 ret = genpd_add_device(genpd, dev, td);
1433 mutex_unlock(&gpd_list_lock);
1434
1435 return ret;
1436}
1437EXPORT_SYMBOL_GPL(__pm_genpd_add_device);
1438
1439static int genpd_remove_device(struct generic_pm_domain *genpd,
1440 struct device *dev)
1441{
1442 struct generic_pm_domain_data *gpd_data;
1443 struct pm_domain_data *pdd;
1444 int ret = 0;
1445
1446 dev_dbg(dev, "%s()\n", __func__);
1447
1448 pdd = dev->power.subsys_data->domain_data;
1449 gpd_data = to_gpd_data(pdd);
1450 dev_pm_qos_remove_notifier(dev, &gpd_data->nb);
1451
1452 genpd_lock(genpd);
1453
1454 if (genpd->prepared_count > 0) {
1455 ret = -EAGAIN;
1456 goto out;
1457 }
1458
1459 genpd->device_count--;
1460 genpd->max_off_time_changed = true;
1461
1462 if (genpd->detach_dev)
1463 genpd->detach_dev(genpd, dev);
1464
1465 dev_pm_domain_set(dev, NULL);
1466
1467 list_del_init(&pdd->list_node);
1468
1469 genpd_unlock(genpd);
1470
1471 genpd_free_dev_data(dev, gpd_data);
1472
1473 return 0;
1474
1475 out:
1476 genpd_unlock(genpd);
1477 dev_pm_qos_add_notifier(dev, &gpd_data->nb);
1478
1479 return ret;
1480}
1481
1482/**
1483 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
1484 * @genpd: PM domain to remove the device from.
1485 * @dev: Device to be removed.
1486 */
1487int pm_genpd_remove_device(struct generic_pm_domain *genpd,
1488 struct device *dev)
1489{
1490 if (!genpd || genpd != genpd_lookup_dev(dev))
1491 return -EINVAL;
1492
1493 return genpd_remove_device(genpd, dev);
1494}
1495EXPORT_SYMBOL_GPL(pm_genpd_remove_device);
1496
1497static int genpd_add_subdomain(struct generic_pm_domain *genpd,
1498 struct generic_pm_domain *subdomain)
1499{
1500 struct gpd_link *link, *itr;
1501 int ret = 0;
1502
1503 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
1504 || genpd == subdomain)
1505 return -EINVAL;
1506
1507 /*
1508 * If the domain can be powered on/off in an IRQ safe
1509 * context, ensure that the subdomain can also be
1510 * powered on/off in that context.
1511 */
1512 if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) {
1513 WARN(1, "Parent %s of subdomain %s must be IRQ safe\n",
1514 genpd->name, subdomain->name);
1515 return -EINVAL;
1516 }
1517
1518 link = kzalloc(sizeof(*link), GFP_KERNEL);
1519 if (!link)
1520 return -ENOMEM;
1521
1522 genpd_lock(subdomain);
1523 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
1524
1525 if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) {
1526 ret = -EINVAL;
1527 goto out;
1528 }
1529
1530 list_for_each_entry(itr, &genpd->master_links, master_node) {
1531 if (itr->slave == subdomain && itr->master == genpd) {
1532 ret = -EINVAL;
1533 goto out;
1534 }
1535 }
1536
1537 link->master = genpd;
1538 list_add_tail(&link->master_node, &genpd->master_links);
1539 link->slave = subdomain;
1540 list_add_tail(&link->slave_node, &subdomain->slave_links);
1541 if (genpd_status_on(subdomain))
1542 genpd_sd_counter_inc(genpd);
1543
1544 out:
1545 genpd_unlock(genpd);
1546 genpd_unlock(subdomain);
1547 if (ret)
1548 kfree(link);
1549 return ret;
1550}
1551
1552/**
1553 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
1554 * @genpd: Master PM domain to add the subdomain to.
1555 * @subdomain: Subdomain to be added.
1556 */
1557int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
1558 struct generic_pm_domain *subdomain)
1559{
1560 int ret;
1561
1562 mutex_lock(&gpd_list_lock);
1563 ret = genpd_add_subdomain(genpd, subdomain);
1564 mutex_unlock(&gpd_list_lock);
1565
1566 return ret;
1567}
1568EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain);
1569
1570/**
1571 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
1572 * @genpd: Master PM domain to remove the subdomain from.
1573 * @subdomain: Subdomain to be removed.
1574 */
1575int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
1576 struct generic_pm_domain *subdomain)
1577{
1578 struct gpd_link *l, *link;
1579 int ret = -EINVAL;
1580
1581 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
1582 return -EINVAL;
1583
1584 genpd_lock(subdomain);
1585 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
1586
1587 if (!list_empty(&subdomain->master_links) || subdomain->device_count) {
1588 pr_warn("%s: unable to remove subdomain %s\n", genpd->name,
1589 subdomain->name);
1590 ret = -EBUSY;
1591 goto out;
1592 }
1593
1594 list_for_each_entry_safe(link, l, &genpd->master_links, master_node) {
1595 if (link->slave != subdomain)
1596 continue;
1597
1598 list_del(&link->master_node);
1599 list_del(&link->slave_node);
1600 kfree(link);
1601 if (genpd_status_on(subdomain))
1602 genpd_sd_counter_dec(genpd);
1603
1604 ret = 0;
1605 break;
1606 }
1607
1608out:
1609 genpd_unlock(genpd);
1610 genpd_unlock(subdomain);
1611
1612 return ret;
1613}
1614EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain);
1615
1616static int genpd_set_default_power_state(struct generic_pm_domain *genpd)
1617{
1618 struct genpd_power_state *state;
1619
1620 state = kzalloc(sizeof(*state), GFP_KERNEL);
1621 if (!state)
1622 return -ENOMEM;
1623
1624 genpd->states = state;
1625 genpd->state_count = 1;
1626 genpd->free = state;
1627
1628 return 0;
1629}
1630
1631static void genpd_lock_init(struct generic_pm_domain *genpd)
1632{
1633 if (genpd->flags & GENPD_FLAG_IRQ_SAFE) {
1634 spin_lock_init(&genpd->slock);
1635 genpd->lock_ops = &genpd_spin_ops;
1636 } else {
1637 mutex_init(&genpd->mlock);
1638 genpd->lock_ops = &genpd_mtx_ops;
1639 }
1640}
1641
1642/**
1643 * pm_genpd_init - Initialize a generic I/O PM domain object.
1644 * @genpd: PM domain object to initialize.
1645 * @gov: PM domain governor to associate with the domain (may be NULL).
1646 * @is_off: Initial value of the domain's power_is_off field.
1647 *
1648 * Returns 0 on successful initialization, else a negative error code.
1649 */
1650int pm_genpd_init(struct generic_pm_domain *genpd,
1651 struct dev_power_governor *gov, bool is_off)
1652{
1653 int ret;
1654
1655 if (IS_ERR_OR_NULL(genpd))
1656 return -EINVAL;
1657
1658 INIT_LIST_HEAD(&genpd->master_links);
1659 INIT_LIST_HEAD(&genpd->slave_links);
1660 INIT_LIST_HEAD(&genpd->dev_list);
1661 genpd_lock_init(genpd);
1662 genpd->gov = gov;
1663 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
1664 atomic_set(&genpd->sd_count, 0);
1665 genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
1666 genpd->device_count = 0;
1667 genpd->max_off_time_ns = -1;
1668 genpd->max_off_time_changed = true;
1669 genpd->provider = NULL;
1670 genpd->has_provider = false;
1671 genpd->accounting_time = ktime_get();
1672 genpd->domain.ops.runtime_suspend = genpd_runtime_suspend;
1673 genpd->domain.ops.runtime_resume = genpd_runtime_resume;
1674 genpd->domain.ops.prepare = genpd_prepare;
1675 genpd->domain.ops.suspend_noirq = genpd_suspend_noirq;
1676 genpd->domain.ops.resume_noirq = genpd_resume_noirq;
1677 genpd->domain.ops.freeze_noirq = genpd_freeze_noirq;
1678 genpd->domain.ops.thaw_noirq = genpd_thaw_noirq;
1679 genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq;
1680 genpd->domain.ops.restore_noirq = genpd_restore_noirq;
1681 genpd->domain.ops.complete = genpd_complete;
1682
1683 if (genpd->flags & GENPD_FLAG_PM_CLK) {
1684 genpd->dev_ops.stop = pm_clk_suspend;
1685 genpd->dev_ops.start = pm_clk_resume;
1686 }
1687
1688 /* Always-on domains must be powered on at initialization. */
1689 if (genpd_is_always_on(genpd) && !genpd_status_on(genpd))
1690 return -EINVAL;
1691
1692 /* Use only one "off" state if there were no states declared */
1693 if (genpd->state_count == 0) {
1694 ret = genpd_set_default_power_state(genpd);
1695 if (ret)
1696 return ret;
1697 }
1698
1699 mutex_lock(&gpd_list_lock);
1700 list_add(&genpd->gpd_list_node, &gpd_list);
1701 mutex_unlock(&gpd_list_lock);
1702
1703 return 0;
1704}
1705EXPORT_SYMBOL_GPL(pm_genpd_init);
1706
1707static int genpd_remove(struct generic_pm_domain *genpd)
1708{
1709 struct gpd_link *l, *link;
1710
1711 if (IS_ERR_OR_NULL(genpd))
1712 return -EINVAL;
1713
1714 genpd_lock(genpd);
1715
1716 if (genpd->has_provider) {
1717 genpd_unlock(genpd);
1718 pr_err("Provider present, unable to remove %s\n", genpd->name);
1719 return -EBUSY;
1720 }
1721
1722 if (!list_empty(&genpd->master_links) || genpd->device_count) {
1723 genpd_unlock(genpd);
1724 pr_err("%s: unable to remove %s\n", __func__, genpd->name);
1725 return -EBUSY;
1726 }
1727
1728 list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) {
1729 list_del(&link->master_node);
1730 list_del(&link->slave_node);
1731 kfree(link);
1732 }
1733
1734 list_del(&genpd->gpd_list_node);
1735 genpd_unlock(genpd);
1736 cancel_work_sync(&genpd->power_off_work);
1737 kfree(genpd->free);
1738 pr_debug("%s: removed %s\n", __func__, genpd->name);
1739
1740 return 0;
1741}
1742
1743/**
1744 * pm_genpd_remove - Remove a generic I/O PM domain
1745 * @genpd: Pointer to PM domain that is to be removed.
1746 *
1747 * To remove the PM domain, this function:
1748 * - Removes the PM domain as a subdomain to any parent domains,
1749 * if it was added.
1750 * - Removes the PM domain from the list of registered PM domains.
1751 *
1752 * The PM domain will only be removed, if the associated provider has
1753 * been removed, it is not a parent to any other PM domain and has no
1754 * devices associated with it.
1755 */
1756int pm_genpd_remove(struct generic_pm_domain *genpd)
1757{
1758 int ret;
1759
1760 mutex_lock(&gpd_list_lock);
1761 ret = genpd_remove(genpd);
1762 mutex_unlock(&gpd_list_lock);
1763
1764 return ret;
1765}
1766EXPORT_SYMBOL_GPL(pm_genpd_remove);
1767
1768#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
1769
1770/*
1771 * Device Tree based PM domain providers.
1772 *
1773 * The code below implements generic device tree based PM domain providers that
1774 * bind device tree nodes with generic PM domains registered in the system.
1775 *
1776 * Any driver that registers generic PM domains and needs to support binding of
1777 * devices to these domains is supposed to register a PM domain provider, which
1778 * maps a PM domain specifier retrieved from the device tree to a PM domain.
1779 *
1780 * Two simple mapping functions have been provided for convenience:
1781 * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping.
1782 * - genpd_xlate_onecell() for mapping of multiple PM domains per node by
1783 * index.
1784 */
1785
1786/**
1787 * struct of_genpd_provider - PM domain provider registration structure
1788 * @link: Entry in global list of PM domain providers
1789 * @node: Pointer to device tree node of PM domain provider
1790 * @xlate: Provider-specific xlate callback mapping a set of specifier cells
1791 * into a PM domain.
1792 * @data: context pointer to be passed into @xlate callback
1793 */
1794struct of_genpd_provider {
1795 struct list_head link;
1796 struct device_node *node;
1797 genpd_xlate_t xlate;
1798 void *data;
1799};
1800
1801/* List of registered PM domain providers. */
1802static LIST_HEAD(of_genpd_providers);
1803/* Mutex to protect the list above. */
1804static DEFINE_MUTEX(of_genpd_mutex);
1805
1806/**
1807 * genpd_xlate_simple() - Xlate function for direct node-domain mapping
1808 * @genpdspec: OF phandle args to map into a PM domain
1809 * @data: xlate function private data - pointer to struct generic_pm_domain
1810 *
1811 * This is a generic xlate function that can be used to model PM domains that
1812 * have their own device tree nodes. The private data of xlate function needs
1813 * to be a valid pointer to struct generic_pm_domain.
1814 */
1815static struct generic_pm_domain *genpd_xlate_simple(
1816 struct of_phandle_args *genpdspec,
1817 void *data)
1818{
1819 return data;
1820}
1821
1822/**
1823 * genpd_xlate_onecell() - Xlate function using a single index.
1824 * @genpdspec: OF phandle args to map into a PM domain
1825 * @data: xlate function private data - pointer to struct genpd_onecell_data
1826 *
1827 * This is a generic xlate function that can be used to model simple PM domain
1828 * controllers that have one device tree node and provide multiple PM domains.
1829 * A single cell is used as an index into an array of PM domains specified in
1830 * the genpd_onecell_data struct when registering the provider.
1831 */
1832static struct generic_pm_domain *genpd_xlate_onecell(
1833 struct of_phandle_args *genpdspec,
1834 void *data)
1835{
1836 struct genpd_onecell_data *genpd_data = data;
1837 unsigned int idx = genpdspec->args[0];
1838
1839 if (genpdspec->args_count != 1)
1840 return ERR_PTR(-EINVAL);
1841
1842 if (idx >= genpd_data->num_domains) {
1843 pr_err("%s: invalid domain index %u\n", __func__, idx);
1844 return ERR_PTR(-EINVAL);
1845 }
1846
1847 if (!genpd_data->domains[idx])
1848 return ERR_PTR(-ENOENT);
1849
1850 return genpd_data->domains[idx];
1851}
1852
1853/**
1854 * genpd_add_provider() - Register a PM domain provider for a node
1855 * @np: Device node pointer associated with the PM domain provider.
1856 * @xlate: Callback for decoding PM domain from phandle arguments.
1857 * @data: Context pointer for @xlate callback.
1858 */
1859static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
1860 void *data)
1861{
1862 struct of_genpd_provider *cp;
1863
1864 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
1865 if (!cp)
1866 return -ENOMEM;
1867
1868 cp->node = of_node_get(np);
1869 cp->data = data;
1870 cp->xlate = xlate;
1871
1872 mutex_lock(&of_genpd_mutex);
1873 list_add(&cp->link, &of_genpd_providers);
1874 mutex_unlock(&of_genpd_mutex);
1875 pr_debug("Added domain provider from %pOF\n", np);
1876
1877 return 0;
1878}
1879
1880/**
1881 * of_genpd_add_provider_simple() - Register a simple PM domain provider
1882 * @np: Device node pointer associated with the PM domain provider.
1883 * @genpd: Pointer to PM domain associated with the PM domain provider.
1884 */
1885int of_genpd_add_provider_simple(struct device_node *np,
1886 struct generic_pm_domain *genpd)
1887{
1888 int ret = -EINVAL;
1889
1890 if (!np || !genpd)
1891 return -EINVAL;
1892
1893 mutex_lock(&gpd_list_lock);
1894
1895 if (genpd_present(genpd)) {
1896 ret = genpd_add_provider(np, genpd_xlate_simple, genpd);
1897 if (!ret) {
1898 genpd->provider = &np->fwnode;
1899 genpd->has_provider = true;
1900 }
1901 }
1902
1903 mutex_unlock(&gpd_list_lock);
1904
1905 return ret;
1906}
1907EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple);
1908
1909/**
1910 * of_genpd_add_provider_onecell() - Register a onecell PM domain provider
1911 * @np: Device node pointer associated with the PM domain provider.
1912 * @data: Pointer to the data associated with the PM domain provider.
1913 */
1914int of_genpd_add_provider_onecell(struct device_node *np,
1915 struct genpd_onecell_data *data)
1916{
1917 unsigned int i;
1918 int ret = -EINVAL;
1919
1920 if (!np || !data)
1921 return -EINVAL;
1922
1923 mutex_lock(&gpd_list_lock);
1924
1925 if (!data->xlate)
1926 data->xlate = genpd_xlate_onecell;
1927
1928 for (i = 0; i < data->num_domains; i++) {
1929 if (!data->domains[i])
1930 continue;
1931 if (!genpd_present(data->domains[i]))
1932 goto error;
1933
1934 data->domains[i]->provider = &np->fwnode;
1935 data->domains[i]->has_provider = true;
1936 }
1937
1938 ret = genpd_add_provider(np, data->xlate, data);
1939 if (ret < 0)
1940 goto error;
1941
1942 mutex_unlock(&gpd_list_lock);
1943
1944 return 0;
1945
1946error:
1947 while (i--) {
1948 if (!data->domains[i])
1949 continue;
1950 data->domains[i]->provider = NULL;
1951 data->domains[i]->has_provider = false;
1952 }
1953
1954 mutex_unlock(&gpd_list_lock);
1955
1956 return ret;
1957}
1958EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell);
1959
1960/**
1961 * of_genpd_del_provider() - Remove a previously registered PM domain provider
1962 * @np: Device node pointer associated with the PM domain provider
1963 */
1964void of_genpd_del_provider(struct device_node *np)
1965{
1966 struct of_genpd_provider *cp, *tmp;
1967 struct generic_pm_domain *gpd;
1968
1969 mutex_lock(&gpd_list_lock);
1970 mutex_lock(&of_genpd_mutex);
1971 list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) {
1972 if (cp->node == np) {
1973 /*
1974 * For each PM domain associated with the
1975 * provider, set the 'has_provider' to false
1976 * so that the PM domain can be safely removed.
1977 */
1978 list_for_each_entry(gpd, &gpd_list, gpd_list_node)
1979 if (gpd->provider == &np->fwnode)
1980 gpd->has_provider = false;
1981
1982 list_del(&cp->link);
1983 of_node_put(cp->node);
1984 kfree(cp);
1985 break;
1986 }
1987 }
1988 mutex_unlock(&of_genpd_mutex);
1989 mutex_unlock(&gpd_list_lock);
1990}
1991EXPORT_SYMBOL_GPL(of_genpd_del_provider);
1992
1993/**
1994 * genpd_get_from_provider() - Look-up PM domain
1995 * @genpdspec: OF phandle args to use for look-up
1996 *
1997 * Looks for a PM domain provider under the node specified by @genpdspec and if
1998 * found, uses xlate function of the provider to map phandle args to a PM
1999 * domain.
2000 *
2001 * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
2002 * on failure.
2003 */
2004static struct generic_pm_domain *genpd_get_from_provider(
2005 struct of_phandle_args *genpdspec)
2006{
2007 struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
2008 struct of_genpd_provider *provider;
2009
2010 if (!genpdspec)
2011 return ERR_PTR(-EINVAL);
2012
2013 mutex_lock(&of_genpd_mutex);
2014
2015 /* Check if we have such a provider in our array */
2016 list_for_each_entry(provider, &of_genpd_providers, link) {
2017 if (provider->node == genpdspec->np)
2018 genpd = provider->xlate(genpdspec, provider->data);
2019 if (!IS_ERR(genpd))
2020 break;
2021 }
2022
2023 mutex_unlock(&of_genpd_mutex);
2024
2025 return genpd;
2026}
2027
2028/**
2029 * of_genpd_add_device() - Add a device to an I/O PM domain
2030 * @genpdspec: OF phandle args to use for look-up PM domain
2031 * @dev: Device to be added.
2032 *
2033 * Looks-up an I/O PM domain based upon phandle args provided and adds
2034 * the device to the PM domain. Returns a negative error code on failure.
2035 */
2036int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev)
2037{
2038 struct generic_pm_domain *genpd;
2039 int ret;
2040
2041 mutex_lock(&gpd_list_lock);
2042
2043 genpd = genpd_get_from_provider(genpdspec);
2044 if (IS_ERR(genpd)) {
2045 ret = PTR_ERR(genpd);
2046 goto out;
2047 }
2048
2049 ret = genpd_add_device(genpd, dev, NULL);
2050
2051out:
2052 mutex_unlock(&gpd_list_lock);
2053
2054 return ret;
2055}
2056EXPORT_SYMBOL_GPL(of_genpd_add_device);
2057
2058/**
2059 * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
2060 * @parent_spec: OF phandle args to use for parent PM domain look-up
2061 * @subdomain_spec: OF phandle args to use for subdomain look-up
2062 *
2063 * Looks-up a parent PM domain and subdomain based upon phandle args
2064 * provided and adds the subdomain to the parent PM domain. Returns a
2065 * negative error code on failure.
2066 */
2067int of_genpd_add_subdomain(struct of_phandle_args *parent_spec,
2068 struct of_phandle_args *subdomain_spec)
2069{
2070 struct generic_pm_domain *parent, *subdomain;
2071 int ret;
2072
2073 mutex_lock(&gpd_list_lock);
2074
2075 parent = genpd_get_from_provider(parent_spec);
2076 if (IS_ERR(parent)) {
2077 ret = PTR_ERR(parent);
2078 goto out;
2079 }
2080
2081 subdomain = genpd_get_from_provider(subdomain_spec);
2082 if (IS_ERR(subdomain)) {
2083 ret = PTR_ERR(subdomain);
2084 goto out;
2085 }
2086
2087 ret = genpd_add_subdomain(parent, subdomain);
2088
2089out:
2090 mutex_unlock(&gpd_list_lock);
2091
2092 return ret;
2093}
2094EXPORT_SYMBOL_GPL(of_genpd_add_subdomain);
2095
2096/**
2097 * of_genpd_remove_last - Remove the last PM domain registered for a provider
2098 * @provider: Pointer to device structure associated with provider
2099 *
2100 * Find the last PM domain that was added by a particular provider and
2101 * remove this PM domain from the list of PM domains. The provider is
2102 * identified by the 'provider' device structure that is passed. The PM
2103 * domain will only be removed, if the provider associated with domain
2104 * has been removed.
2105 *
2106 * Returns a valid pointer to struct generic_pm_domain on success or
2107 * ERR_PTR() on failure.
2108 */
2109struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
2110{
2111 struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT);
2112 int ret;
2113
2114 if (IS_ERR_OR_NULL(np))
2115 return ERR_PTR(-EINVAL);
2116
2117 mutex_lock(&gpd_list_lock);
2118 list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) {
2119 if (gpd->provider == &np->fwnode) {
2120 ret = genpd_remove(gpd);
2121 genpd = ret ? ERR_PTR(ret) : gpd;
2122 break;
2123 }
2124 }
2125 mutex_unlock(&gpd_list_lock);
2126
2127 return genpd;
2128}
2129EXPORT_SYMBOL_GPL(of_genpd_remove_last);
2130
2131/**
2132 * genpd_dev_pm_detach - Detach a device from its PM domain.
2133 * @dev: Device to detach.
2134 * @power_off: Currently not used
2135 *
2136 * Try to locate a corresponding generic PM domain, which the device was
2137 * attached to previously. If such is found, the device is detached from it.
2138 */
2139static void genpd_dev_pm_detach(struct device *dev, bool power_off)
2140{
2141 struct generic_pm_domain *pd;
2142 unsigned int i;
2143 int ret = 0;
2144
2145 pd = dev_to_genpd(dev);
2146 if (IS_ERR(pd))
2147 return;
2148
2149 dev_dbg(dev, "removing from PM domain %s\n", pd->name);
2150
2151 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
2152 ret = genpd_remove_device(pd, dev);
2153 if (ret != -EAGAIN)
2154 break;
2155
2156 mdelay(i);
2157 cond_resched();
2158 }
2159
2160 if (ret < 0) {
2161 dev_err(dev, "failed to remove from PM domain %s: %d",
2162 pd->name, ret);
2163 return;
2164 }
2165
2166 /* Check if PM domain can be powered off after removing this device. */
2167 genpd_queue_power_off_work(pd);
2168}
2169
2170static void genpd_dev_pm_sync(struct device *dev)
2171{
2172 struct generic_pm_domain *pd;
2173
2174 pd = dev_to_genpd(dev);
2175 if (IS_ERR(pd))
2176 return;
2177
2178 genpd_queue_power_off_work(pd);
2179}
2180
2181/**
2182 * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
2183 * @dev: Device to attach.
2184 *
2185 * Parse device's OF node to find a PM domain specifier. If such is found,
2186 * attaches the device to retrieved pm_domain ops.
2187 *
2188 * Both generic and legacy Samsung-specific DT bindings are supported to keep
2189 * backwards compatibility with existing DTBs.
2190 *
2191 * Returns 0 on successfully attached PM domain or negative error code. Note
2192 * that if a power-domain exists for the device, but it cannot be found or
2193 * turned on, then return -EPROBE_DEFER to ensure that the device is not
2194 * probed and to re-try again later.
2195 */
2196int genpd_dev_pm_attach(struct device *dev)
2197{
2198 struct of_phandle_args pd_args;
2199 struct generic_pm_domain *pd;
2200 unsigned int i;
2201 int ret;
2202
2203 if (!dev->of_node)
2204 return -ENODEV;
2205
2206 if (dev->pm_domain)
2207 return -EEXIST;
2208
2209 ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
2210 "#power-domain-cells", 0, &pd_args);
2211 if (ret < 0)
2212 return ret;
2213
2214 mutex_lock(&gpd_list_lock);
2215 pd = genpd_get_from_provider(&pd_args);
2216 of_node_put(pd_args.np);
2217 if (IS_ERR(pd)) {
2218 mutex_unlock(&gpd_list_lock);
2219 dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
2220 __func__, PTR_ERR(pd));
2221 return -EPROBE_DEFER;
2222 }
2223
2224 dev_dbg(dev, "adding to PM domain %s\n", pd->name);
2225
2226 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
2227 ret = genpd_add_device(pd, dev, NULL);
2228 if (ret != -EAGAIN)
2229 break;
2230
2231 mdelay(i);
2232 cond_resched();
2233 }
2234 mutex_unlock(&gpd_list_lock);
2235
2236 if (ret < 0) {
2237 if (ret != -EPROBE_DEFER)
2238 dev_err(dev, "failed to add to PM domain %s: %d",
2239 pd->name, ret);
2240 goto out;
2241 }
2242
2243 dev->pm_domain->detach = genpd_dev_pm_detach;
2244 dev->pm_domain->sync = genpd_dev_pm_sync;
2245
2246 genpd_lock(pd);
2247 ret = genpd_power_on(pd, 0);
2248 genpd_unlock(pd);
2249out:
2250 return ret ? -EPROBE_DEFER : 0;
2251}
2252EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
2253
2254static const struct of_device_id idle_state_match[] = {
2255 { .compatible = "domain-idle-state", },
2256 { }
2257};
2258
2259static int genpd_parse_state(struct genpd_power_state *genpd_state,
2260 struct device_node *state_node)
2261{
2262 int err;
2263 u32 residency;
2264 u32 entry_latency, exit_latency;
2265
2266 err = of_property_read_u32(state_node, "entry-latency-us",
2267 &entry_latency);
2268 if (err) {
2269 pr_debug(" * %pOF missing entry-latency-us property\n",
2270 state_node);
2271 return -EINVAL;
2272 }
2273
2274 err = of_property_read_u32(state_node, "exit-latency-us",
2275 &exit_latency);
2276 if (err) {
2277 pr_debug(" * %pOF missing exit-latency-us property\n",
2278 state_node);
2279 return -EINVAL;
2280 }
2281
2282 err = of_property_read_u32(state_node, "min-residency-us", &residency);
2283 if (!err)
2284 genpd_state->residency_ns = 1000 * residency;
2285
2286 genpd_state->power_on_latency_ns = 1000 * exit_latency;
2287 genpd_state->power_off_latency_ns = 1000 * entry_latency;
2288 genpd_state->fwnode = &state_node->fwnode;
2289
2290 return 0;
2291}
2292
2293static int genpd_iterate_idle_states(struct device_node *dn,
2294 struct genpd_power_state *states)
2295{
2296 int ret;
2297 struct of_phandle_iterator it;
2298 struct device_node *np;
2299 int i = 0;
2300
2301 ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL);
2302 if (ret <= 0)
2303 return ret;
2304
2305 /* Loop over the phandles until all the requested entry is found */
2306 of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) {
2307 np = it.node;
2308 if (!of_match_node(idle_state_match, np))
2309 continue;
2310 if (states) {
2311 ret = genpd_parse_state(&states[i], np);
2312 if (ret) {
2313 pr_err("Parsing idle state node %pOF failed with err %d\n",
2314 np, ret);
2315 of_node_put(np);
2316 return ret;
2317 }
2318 }
2319 i++;
2320 }
2321
2322 return i;
2323}
2324
2325/**
2326 * of_genpd_parse_idle_states: Return array of idle states for the genpd.
2327 *
2328 * @dn: The genpd device node
2329 * @states: The pointer to which the state array will be saved.
2330 * @n: The count of elements in the array returned from this function.
2331 *
2332 * Returns the device states parsed from the OF node. The memory for the states
2333 * is allocated by this function and is the responsibility of the caller to
2334 * free the memory after use. If no domain idle states is found it returns
2335 * -EINVAL and in case of errors, a negative error code.
2336 */
2337int of_genpd_parse_idle_states(struct device_node *dn,
2338 struct genpd_power_state **states, int *n)
2339{
2340 struct genpd_power_state *st;
2341 int ret;
2342
2343 ret = genpd_iterate_idle_states(dn, NULL);
2344 if (ret <= 0)
2345 return ret < 0 ? ret : -EINVAL;
2346
2347 st = kcalloc(ret, sizeof(*st), GFP_KERNEL);
2348 if (!st)
2349 return -ENOMEM;
2350
2351 ret = genpd_iterate_idle_states(dn, st);
2352 if (ret <= 0) {
2353 kfree(st);
2354 return ret < 0 ? ret : -EINVAL;
2355 }
2356
2357 *states = st;
2358 *n = ret;
2359
2360 return 0;
2361}
2362EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states);
2363
2364#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
2365
2366
2367/*** debugfs support ***/
2368
2369#ifdef CONFIG_DEBUG_FS
2370#include <linux/pm.h>
2371#include <linux/device.h>
2372#include <linux/debugfs.h>
2373#include <linux/seq_file.h>
2374#include <linux/init.h>
2375#include <linux/kobject.h>
2376static struct dentry *genpd_debugfs_dir;
2377
2378/*
2379 * TODO: This function is a slightly modified version of rtpm_status_show
2380 * from sysfs.c, so generalize it.
2381 */
2382static void rtpm_status_str(struct seq_file *s, struct device *dev)
2383{
2384 static const char * const status_lookup[] = {
2385 [RPM_ACTIVE] = "active",
2386 [RPM_RESUMING] = "resuming",
2387 [RPM_SUSPENDED] = "suspended",
2388 [RPM_SUSPENDING] = "suspending"
2389 };
2390 const char *p = "";
2391
2392 if (dev->power.runtime_error)
2393 p = "error";
2394 else if (dev->power.disable_depth)
2395 p = "unsupported";
2396 else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup))
2397 p = status_lookup[dev->power.runtime_status];
2398 else
2399 WARN_ON(1);
2400
2401 seq_puts(s, p);
2402}
2403
2404static int genpd_summary_one(struct seq_file *s,
2405 struct generic_pm_domain *genpd)
2406{
2407 static const char * const status_lookup[] = {
2408 [GPD_STATE_ACTIVE] = "on",
2409 [GPD_STATE_POWER_OFF] = "off"
2410 };
2411 struct pm_domain_data *pm_data;
2412 const char *kobj_path;
2413 struct gpd_link *link;
2414 char state[16];
2415 int ret;
2416
2417 ret = genpd_lock_interruptible(genpd);
2418 if (ret)
2419 return -ERESTARTSYS;
2420
2421 if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup)))
2422 goto exit;
2423 if (!genpd_status_on(genpd))
2424 snprintf(state, sizeof(state), "%s-%u",
2425 status_lookup[genpd->status], genpd->state_idx);
2426 else
2427 snprintf(state, sizeof(state), "%s",
2428 status_lookup[genpd->status]);
2429 seq_printf(s, "%-30s %-15s ", genpd->name, state);
2430
2431 /*
2432 * Modifications on the list require holding locks on both
2433 * master and slave, so we are safe.
2434 * Also genpd->name is immutable.
2435 */
2436 list_for_each_entry(link, &genpd->master_links, master_node) {
2437 seq_printf(s, "%s", link->slave->name);
2438 if (!list_is_last(&link->master_node, &genpd->master_links))
2439 seq_puts(s, ", ");
2440 }
2441
2442 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
2443 kobj_path = kobject_get_path(&pm_data->dev->kobj,
2444 genpd_is_irq_safe(genpd) ?
2445 GFP_ATOMIC : GFP_KERNEL);
2446 if (kobj_path == NULL)
2447 continue;
2448
2449 seq_printf(s, "\n %-50s ", kobj_path);
2450 rtpm_status_str(s, pm_data->dev);
2451 kfree(kobj_path);
2452 }
2453
2454 seq_puts(s, "\n");
2455exit:
2456 genpd_unlock(genpd);
2457
2458 return 0;
2459}
2460
2461static int genpd_summary_show(struct seq_file *s, void *data)
2462{
2463 struct generic_pm_domain *genpd;
2464 int ret = 0;
2465
2466 seq_puts(s, "domain status slaves\n");
2467 seq_puts(s, " /device runtime status\n");
2468 seq_puts(s, "----------------------------------------------------------------------\n");
2469
2470 ret = mutex_lock_interruptible(&gpd_list_lock);
2471 if (ret)
2472 return -ERESTARTSYS;
2473
2474 list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
2475 ret = genpd_summary_one(s, genpd);
2476 if (ret)
2477 break;
2478 }
2479 mutex_unlock(&gpd_list_lock);
2480
2481 return ret;
2482}
2483
2484static int genpd_status_show(struct seq_file *s, void *data)
2485{
2486 static const char * const status_lookup[] = {
2487 [GPD_STATE_ACTIVE] = "on",
2488 [GPD_STATE_POWER_OFF] = "off"
2489 };
2490
2491 struct generic_pm_domain *genpd = s->private;
2492 int ret = 0;
2493
2494 ret = genpd_lock_interruptible(genpd);
2495 if (ret)
2496 return -ERESTARTSYS;
2497
2498 if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup)))
2499 goto exit;
2500
2501 if (genpd->status == GPD_STATE_POWER_OFF)
2502 seq_printf(s, "%s-%u\n", status_lookup[genpd->status],
2503 genpd->state_idx);
2504 else
2505 seq_printf(s, "%s\n", status_lookup[genpd->status]);
2506exit:
2507 genpd_unlock(genpd);
2508 return ret;
2509}
2510
2511static int genpd_sub_domains_show(struct seq_file *s, void *data)
2512{
2513 struct generic_pm_domain *genpd = s->private;
2514 struct gpd_link *link;
2515 int ret = 0;
2516
2517 ret = genpd_lock_interruptible(genpd);
2518 if (ret)
2519 return -ERESTARTSYS;
2520
2521 list_for_each_entry(link, &genpd->master_links, master_node)
2522 seq_printf(s, "%s\n", link->slave->name);
2523
2524 genpd_unlock(genpd);
2525 return ret;
2526}
2527
2528static int genpd_idle_states_show(struct seq_file *s, void *data)
2529{
2530 struct generic_pm_domain *genpd = s->private;
2531 unsigned int i;
2532 int ret = 0;
2533
2534 ret = genpd_lock_interruptible(genpd);
2535 if (ret)
2536 return -ERESTARTSYS;
2537
2538 seq_puts(s, "State Time Spent(ms)\n");
2539
2540 for (i = 0; i < genpd->state_count; i++) {
2541 ktime_t delta = 0;
2542 s64 msecs;
2543
2544 if ((genpd->status == GPD_STATE_POWER_OFF) &&
2545 (genpd->state_idx == i))
2546 delta = ktime_sub(ktime_get(), genpd->accounting_time);
2547
2548 msecs = ktime_to_ms(
2549 ktime_add(genpd->states[i].idle_time, delta));
2550 seq_printf(s, "S%-13i %lld\n", i, msecs);
2551 }
2552
2553 genpd_unlock(genpd);
2554 return ret;
2555}
2556
2557static int genpd_active_time_show(struct seq_file *s, void *data)
2558{
2559 struct generic_pm_domain *genpd = s->private;
2560 ktime_t delta = 0;
2561 int ret = 0;
2562
2563 ret = genpd_lock_interruptible(genpd);
2564 if (ret)
2565 return -ERESTARTSYS;
2566
2567 if (genpd->status == GPD_STATE_ACTIVE)
2568 delta = ktime_sub(ktime_get(), genpd->accounting_time);
2569
2570 seq_printf(s, "%lld ms\n", ktime_to_ms(
2571 ktime_add(genpd->on_time, delta)));
2572
2573 genpd_unlock(genpd);
2574 return ret;
2575}
2576
2577static int genpd_total_idle_time_show(struct seq_file *s, void *data)
2578{
2579 struct generic_pm_domain *genpd = s->private;
2580 ktime_t delta = 0, total = 0;
2581 unsigned int i;
2582 int ret = 0;
2583
2584 ret = genpd_lock_interruptible(genpd);
2585 if (ret)
2586 return -ERESTARTSYS;
2587
2588 for (i = 0; i < genpd->state_count; i++) {
2589
2590 if ((genpd->status == GPD_STATE_POWER_OFF) &&
2591 (genpd->state_idx == i))
2592 delta = ktime_sub(ktime_get(), genpd->accounting_time);
2593
2594 total = ktime_add(total, genpd->states[i].idle_time);
2595 }
2596 total = ktime_add(total, delta);
2597
2598 seq_printf(s, "%lld ms\n", ktime_to_ms(total));
2599
2600 genpd_unlock(genpd);
2601 return ret;
2602}
2603
2604
2605static int genpd_devices_show(struct seq_file *s, void *data)
2606{
2607 struct generic_pm_domain *genpd = s->private;
2608 struct pm_domain_data *pm_data;
2609 const char *kobj_path;
2610 int ret = 0;
2611
2612 ret = genpd_lock_interruptible(genpd);
2613 if (ret)
2614 return -ERESTARTSYS;
2615
2616 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
2617 kobj_path = kobject_get_path(&pm_data->dev->kobj,
2618 genpd_is_irq_safe(genpd) ?
2619 GFP_ATOMIC : GFP_KERNEL);
2620 if (kobj_path == NULL)
2621 continue;
2622
2623 seq_printf(s, "%s\n", kobj_path);
2624 kfree(kobj_path);
2625 }
2626
2627 genpd_unlock(genpd);
2628 return ret;
2629}
2630
2631#define define_genpd_open_function(name) \
2632static int genpd_##name##_open(struct inode *inode, struct file *file) \
2633{ \
2634 return single_open(file, genpd_##name##_show, inode->i_private); \
2635}
2636
2637define_genpd_open_function(summary);
2638define_genpd_open_function(status);
2639define_genpd_open_function(sub_domains);
2640define_genpd_open_function(idle_states);
2641define_genpd_open_function(active_time);
2642define_genpd_open_function(total_idle_time);
2643define_genpd_open_function(devices);
2644
2645#define define_genpd_debugfs_fops(name) \
2646static const struct file_operations genpd_##name##_fops = { \
2647 .open = genpd_##name##_open, \
2648 .read = seq_read, \
2649 .llseek = seq_lseek, \
2650 .release = single_release, \
2651}
2652
2653define_genpd_debugfs_fops(summary);
2654define_genpd_debugfs_fops(status);
2655define_genpd_debugfs_fops(sub_domains);
2656define_genpd_debugfs_fops(idle_states);
2657define_genpd_debugfs_fops(active_time);
2658define_genpd_debugfs_fops(total_idle_time);
2659define_genpd_debugfs_fops(devices);
2660
2661static int __init genpd_debug_init(void)
2662{
2663 struct dentry *d;
2664 struct generic_pm_domain *genpd;
2665
2666 genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL);
2667
2668 if (!genpd_debugfs_dir)
2669 return -ENOMEM;
2670
2671 d = debugfs_create_file("pm_genpd_summary", S_IRUGO,
2672 genpd_debugfs_dir, NULL, &genpd_summary_fops);
2673 if (!d)
2674 return -ENOMEM;
2675
2676 list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
2677 d = debugfs_create_dir(genpd->name, genpd_debugfs_dir);
2678 if (!d)
2679 return -ENOMEM;
2680
2681 debugfs_create_file("current_state", 0444,
2682 d, genpd, &genpd_status_fops);
2683 debugfs_create_file("sub_domains", 0444,
2684 d, genpd, &genpd_sub_domains_fops);
2685 debugfs_create_file("idle_states", 0444,
2686 d, genpd, &genpd_idle_states_fops);
2687 debugfs_create_file("active_time", 0444,
2688 d, genpd, &genpd_active_time_fops);
2689 debugfs_create_file("total_idle_time", 0444,
2690 d, genpd, &genpd_total_idle_time_fops);
2691 debugfs_create_file("devices", 0444,
2692 d, genpd, &genpd_devices_fops);
2693 }
2694
2695 return 0;
2696}
2697late_initcall(genpd_debug_init);
2698
2699static void __exit genpd_debug_exit(void)
2700{
2701 debugfs_remove_recursive(genpd_debugfs_dir);
2702}
2703__exitcall(genpd_debug_exit);
2704#endif /* CONFIG_DEBUG_FS */