Loading...
Note: File does not exist in v3.1.
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/idr.h>
11#include <linux/kernel.h>
12#include <linux/io.h>
13#include <linux/platform_device.h>
14#include <linux/pm_opp.h>
15#include <linux/pm_runtime.h>
16#include <linux/pm_domain.h>
17#include <linux/pm_qos.h>
18#include <linux/pm_clock.h>
19#include <linux/slab.h>
20#include <linux/err.h>
21#include <linux/sched.h>
22#include <linux/suspend.h>
23#include <linux/export.h>
24#include <linux/cpu.h>
25#include <linux/debugfs.h>
26
27/* Provides a unique ID for each genpd device */
28static DEFINE_IDA(genpd_ida);
29
30#define GENPD_RETRY_MAX_MS 250 /* Approximate */
31
32#define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \
33({ \
34 type (*__routine)(struct device *__d); \
35 type __ret = (type)0; \
36 \
37 __routine = genpd->dev_ops.callback; \
38 if (__routine) { \
39 __ret = __routine(dev); \
40 } \
41 __ret; \
42})
43
44static LIST_HEAD(gpd_list);
45static DEFINE_MUTEX(gpd_list_lock);
46
47struct genpd_lock_ops {
48 void (*lock)(struct generic_pm_domain *genpd);
49 void (*lock_nested)(struct generic_pm_domain *genpd, int depth);
50 int (*lock_interruptible)(struct generic_pm_domain *genpd);
51 void (*unlock)(struct generic_pm_domain *genpd);
52};
53
54static void genpd_lock_mtx(struct generic_pm_domain *genpd)
55{
56 mutex_lock(&genpd->mlock);
57}
58
59static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd,
60 int depth)
61{
62 mutex_lock_nested(&genpd->mlock, depth);
63}
64
65static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd)
66{
67 return mutex_lock_interruptible(&genpd->mlock);
68}
69
70static void genpd_unlock_mtx(struct generic_pm_domain *genpd)
71{
72 return mutex_unlock(&genpd->mlock);
73}
74
75static const struct genpd_lock_ops genpd_mtx_ops = {
76 .lock = genpd_lock_mtx,
77 .lock_nested = genpd_lock_nested_mtx,
78 .lock_interruptible = genpd_lock_interruptible_mtx,
79 .unlock = genpd_unlock_mtx,
80};
81
82static void genpd_lock_spin(struct generic_pm_domain *genpd)
83 __acquires(&genpd->slock)
84{
85 unsigned long flags;
86
87 spin_lock_irqsave(&genpd->slock, flags);
88 genpd->lock_flags = flags;
89}
90
91static void genpd_lock_nested_spin(struct generic_pm_domain *genpd,
92 int depth)
93 __acquires(&genpd->slock)
94{
95 unsigned long flags;
96
97 spin_lock_irqsave_nested(&genpd->slock, flags, depth);
98 genpd->lock_flags = flags;
99}
100
101static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd)
102 __acquires(&genpd->slock)
103{
104 unsigned long flags;
105
106 spin_lock_irqsave(&genpd->slock, flags);
107 genpd->lock_flags = flags;
108 return 0;
109}
110
111static void genpd_unlock_spin(struct generic_pm_domain *genpd)
112 __releases(&genpd->slock)
113{
114 spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags);
115}
116
117static const struct genpd_lock_ops genpd_spin_ops = {
118 .lock = genpd_lock_spin,
119 .lock_nested = genpd_lock_nested_spin,
120 .lock_interruptible = genpd_lock_interruptible_spin,
121 .unlock = genpd_unlock_spin,
122};
123
124static void genpd_lock_raw_spin(struct generic_pm_domain *genpd)
125 __acquires(&genpd->raw_slock)
126{
127 unsigned long flags;
128
129 raw_spin_lock_irqsave(&genpd->raw_slock, flags);
130 genpd->raw_lock_flags = flags;
131}
132
133static void genpd_lock_nested_raw_spin(struct generic_pm_domain *genpd,
134 int depth)
135 __acquires(&genpd->raw_slock)
136{
137 unsigned long flags;
138
139 raw_spin_lock_irqsave_nested(&genpd->raw_slock, flags, depth);
140 genpd->raw_lock_flags = flags;
141}
142
143static int genpd_lock_interruptible_raw_spin(struct generic_pm_domain *genpd)
144 __acquires(&genpd->raw_slock)
145{
146 unsigned long flags;
147
148 raw_spin_lock_irqsave(&genpd->raw_slock, flags);
149 genpd->raw_lock_flags = flags;
150 return 0;
151}
152
153static void genpd_unlock_raw_spin(struct generic_pm_domain *genpd)
154 __releases(&genpd->raw_slock)
155{
156 raw_spin_unlock_irqrestore(&genpd->raw_slock, genpd->raw_lock_flags);
157}
158
159static const struct genpd_lock_ops genpd_raw_spin_ops = {
160 .lock = genpd_lock_raw_spin,
161 .lock_nested = genpd_lock_nested_raw_spin,
162 .lock_interruptible = genpd_lock_interruptible_raw_spin,
163 .unlock = genpd_unlock_raw_spin,
164};
165
166#define genpd_lock(p) p->lock_ops->lock(p)
167#define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d)
168#define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p)
169#define genpd_unlock(p) p->lock_ops->unlock(p)
170
171#define genpd_status_on(genpd) (genpd->status == GENPD_STATE_ON)
172#define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE)
173#define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON)
174#define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP)
175#define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN)
176#define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON)
177#define genpd_is_opp_table_fw(genpd) (genpd->flags & GENPD_FLAG_OPP_TABLE_FW)
178#define genpd_is_dev_name_fw(genpd) (genpd->flags & GENPD_FLAG_DEV_NAME_FW)
179
180static inline bool irq_safe_dev_in_sleep_domain(struct device *dev,
181 const struct generic_pm_domain *genpd)
182{
183 bool ret;
184
185 ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd);
186
187 /*
188 * Warn once if an IRQ safe device is attached to a domain, which
189 * callbacks are allowed to sleep. This indicates a suboptimal
190 * configuration for PM, but it doesn't matter for an always on domain.
191 */
192 if (genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd))
193 return ret;
194
195 if (ret)
196 dev_warn_once(dev, "PM domain %s will not be powered off\n",
197 dev_name(&genpd->dev));
198
199 return ret;
200}
201
202static int genpd_runtime_suspend(struct device *dev);
203
204/*
205 * Get the generic PM domain for a particular struct device.
206 * This validates the struct device pointer, the PM domain pointer,
207 * and checks that the PM domain pointer is a real generic PM domain.
208 * Any failure results in NULL being returned.
209 */
210static struct generic_pm_domain *dev_to_genpd_safe(struct device *dev)
211{
212 if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain))
213 return NULL;
214
215 /* A genpd's always have its ->runtime_suspend() callback assigned. */
216 if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend)
217 return pd_to_genpd(dev->pm_domain);
218
219 return NULL;
220}
221
222/*
223 * This should only be used where we are certain that the pm_domain
224 * attached to the device is a genpd domain.
225 */
226static struct generic_pm_domain *dev_to_genpd(struct device *dev)
227{
228 if (IS_ERR_OR_NULL(dev->pm_domain))
229 return ERR_PTR(-EINVAL);
230
231 return pd_to_genpd(dev->pm_domain);
232}
233
234struct device *dev_to_genpd_dev(struct device *dev)
235{
236 struct generic_pm_domain *genpd = dev_to_genpd(dev);
237
238 if (IS_ERR(genpd))
239 return ERR_CAST(genpd);
240
241 return &genpd->dev;
242}
243
244static int genpd_stop_dev(const struct generic_pm_domain *genpd,
245 struct device *dev)
246{
247 return GENPD_DEV_CALLBACK(genpd, int, stop, dev);
248}
249
250static int genpd_start_dev(const struct generic_pm_domain *genpd,
251 struct device *dev)
252{
253 return GENPD_DEV_CALLBACK(genpd, int, start, dev);
254}
255
256static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
257{
258 bool ret = false;
259
260 if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
261 ret = !!atomic_dec_and_test(&genpd->sd_count);
262
263 return ret;
264}
265
266static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
267{
268 atomic_inc(&genpd->sd_count);
269 smp_mb__after_atomic();
270}
271
272#ifdef CONFIG_DEBUG_FS
273static struct dentry *genpd_debugfs_dir;
274
275static void genpd_debug_add(struct generic_pm_domain *genpd);
276
277static void genpd_debug_remove(struct generic_pm_domain *genpd)
278{
279 if (!genpd_debugfs_dir)
280 return;
281
282 debugfs_lookup_and_remove(dev_name(&genpd->dev), genpd_debugfs_dir);
283}
284
285static void genpd_update_accounting(struct generic_pm_domain *genpd)
286{
287 u64 delta, now;
288
289 now = ktime_get_mono_fast_ns();
290 if (now <= genpd->accounting_time)
291 return;
292
293 delta = now - genpd->accounting_time;
294
295 /*
296 * If genpd->status is active, it means we are just
297 * out of off and so update the idle time and vice
298 * versa.
299 */
300 if (genpd->status == GENPD_STATE_ON)
301 genpd->states[genpd->state_idx].idle_time += delta;
302 else
303 genpd->on_time += delta;
304
305 genpd->accounting_time = now;
306}
307#else
308static inline void genpd_debug_add(struct generic_pm_domain *genpd) {}
309static inline void genpd_debug_remove(struct generic_pm_domain *genpd) {}
310static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {}
311#endif
312
313static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd,
314 unsigned int state)
315{
316 struct generic_pm_domain_data *pd_data;
317 struct pm_domain_data *pdd;
318 struct gpd_link *link;
319
320 /* New requested state is same as Max requested state */
321 if (state == genpd->performance_state)
322 return state;
323
324 /* New requested state is higher than Max requested state */
325 if (state > genpd->performance_state)
326 return state;
327
328 /* Traverse all devices within the domain */
329 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
330 pd_data = to_gpd_data(pdd);
331
332 if (pd_data->performance_state > state)
333 state = pd_data->performance_state;
334 }
335
336 /*
337 * Traverse all sub-domains within the domain. This can be
338 * done without any additional locking as the link->performance_state
339 * field is protected by the parent genpd->lock, which is already taken.
340 *
341 * Also note that link->performance_state (subdomain's performance state
342 * requirement to parent domain) is different from
343 * link->child->performance_state (current performance state requirement
344 * of the devices/sub-domains of the subdomain) and so can have a
345 * different value.
346 *
347 * Note that we also take vote from powered-off sub-domains into account
348 * as the same is done for devices right now.
349 */
350 list_for_each_entry(link, &genpd->parent_links, parent_node) {
351 if (link->performance_state > state)
352 state = link->performance_state;
353 }
354
355 return state;
356}
357
358static int genpd_xlate_performance_state(struct generic_pm_domain *genpd,
359 struct generic_pm_domain *parent,
360 unsigned int pstate)
361{
362 if (!parent->set_performance_state)
363 return pstate;
364
365 return dev_pm_opp_xlate_performance_state(genpd->opp_table,
366 parent->opp_table,
367 pstate);
368}
369
370static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
371 unsigned int state, int depth);
372
373static void _genpd_rollback_parent_state(struct gpd_link *link, int depth)
374{
375 struct generic_pm_domain *parent = link->parent;
376 int parent_state;
377
378 genpd_lock_nested(parent, depth + 1);
379
380 parent_state = link->prev_performance_state;
381 link->performance_state = parent_state;
382
383 parent_state = _genpd_reeval_performance_state(parent, parent_state);
384 if (_genpd_set_performance_state(parent, parent_state, depth + 1)) {
385 pr_err("%s: Failed to roll back to %d performance state\n",
386 parent->name, parent_state);
387 }
388
389 genpd_unlock(parent);
390}
391
392static int _genpd_set_parent_state(struct generic_pm_domain *genpd,
393 struct gpd_link *link,
394 unsigned int state, int depth)
395{
396 struct generic_pm_domain *parent = link->parent;
397 int parent_state, ret;
398
399 /* Find parent's performance state */
400 ret = genpd_xlate_performance_state(genpd, parent, state);
401 if (unlikely(ret < 0))
402 return ret;
403
404 parent_state = ret;
405
406 genpd_lock_nested(parent, depth + 1);
407
408 link->prev_performance_state = link->performance_state;
409 link->performance_state = parent_state;
410
411 parent_state = _genpd_reeval_performance_state(parent, parent_state);
412 ret = _genpd_set_performance_state(parent, parent_state, depth + 1);
413 if (ret)
414 link->performance_state = link->prev_performance_state;
415
416 genpd_unlock(parent);
417
418 return ret;
419}
420
421static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
422 unsigned int state, int depth)
423{
424 struct gpd_link *link = NULL;
425 int ret;
426
427 if (state == genpd->performance_state)
428 return 0;
429
430 /* When scaling up, propagate to parents first in normal order */
431 if (state > genpd->performance_state) {
432 list_for_each_entry(link, &genpd->child_links, child_node) {
433 ret = _genpd_set_parent_state(genpd, link, state, depth);
434 if (ret)
435 goto rollback_parents_up;
436 }
437 }
438
439 if (genpd->set_performance_state) {
440 ret = genpd->set_performance_state(genpd, state);
441 if (ret) {
442 if (link)
443 goto rollback_parents_up;
444 return ret;
445 }
446 }
447
448 /* When scaling down, propagate to parents last in reverse order */
449 if (state < genpd->performance_state) {
450 list_for_each_entry_reverse(link, &genpd->child_links, child_node) {
451 ret = _genpd_set_parent_state(genpd, link, state, depth);
452 if (ret)
453 goto rollback_parents_down;
454 }
455 }
456
457 genpd->performance_state = state;
458 return 0;
459
460rollback_parents_up:
461 list_for_each_entry_continue_reverse(link, &genpd->child_links, child_node)
462 _genpd_rollback_parent_state(link, depth);
463 return ret;
464rollback_parents_down:
465 list_for_each_entry_continue(link, &genpd->child_links, child_node)
466 _genpd_rollback_parent_state(link, depth);
467 return ret;
468}
469
470static int genpd_set_performance_state(struct device *dev, unsigned int state)
471{
472 struct generic_pm_domain *genpd = dev_to_genpd(dev);
473 struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev);
474 unsigned int prev_state;
475 int ret;
476
477 prev_state = gpd_data->performance_state;
478 if (prev_state == state)
479 return 0;
480
481 gpd_data->performance_state = state;
482 state = _genpd_reeval_performance_state(genpd, state);
483
484 ret = _genpd_set_performance_state(genpd, state, 0);
485 if (ret)
486 gpd_data->performance_state = prev_state;
487
488 return ret;
489}
490
491static int genpd_drop_performance_state(struct device *dev)
492{
493 unsigned int prev_state = dev_gpd_data(dev)->performance_state;
494
495 if (!genpd_set_performance_state(dev, 0))
496 return prev_state;
497
498 return 0;
499}
500
501static void genpd_restore_performance_state(struct device *dev,
502 unsigned int state)
503{
504 if (state)
505 genpd_set_performance_state(dev, state);
506}
507
508static int genpd_dev_pm_set_performance_state(struct device *dev,
509 unsigned int state)
510{
511 struct generic_pm_domain *genpd = dev_to_genpd(dev);
512 int ret = 0;
513
514 genpd_lock(genpd);
515 if (pm_runtime_suspended(dev)) {
516 dev_gpd_data(dev)->rpm_pstate = state;
517 } else {
518 ret = genpd_set_performance_state(dev, state);
519 if (!ret)
520 dev_gpd_data(dev)->rpm_pstate = 0;
521 }
522 genpd_unlock(genpd);
523
524 return ret;
525}
526
527/**
528 * dev_pm_genpd_set_performance_state- Set performance state of device's power
529 * domain.
530 *
531 * @dev: Device for which the performance-state needs to be set.
532 * @state: Target performance state of the device. This can be set as 0 when the
533 * device doesn't have any performance state constraints left (And so
534 * the device wouldn't participate anymore to find the target
535 * performance state of the genpd).
536 *
537 * It is assumed that the users guarantee that the genpd wouldn't be detached
538 * while this routine is getting called.
539 *
540 * Returns 0 on success and negative error values on failures.
541 */
542int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
543{
544 struct generic_pm_domain *genpd;
545
546 genpd = dev_to_genpd_safe(dev);
547 if (!genpd)
548 return -ENODEV;
549
550 if (WARN_ON(!dev->power.subsys_data ||
551 !dev->power.subsys_data->domain_data))
552 return -EINVAL;
553
554 return genpd_dev_pm_set_performance_state(dev, state);
555}
556EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state);
557
558/**
559 * dev_pm_genpd_set_next_wakeup - Notify PM framework of an impending wakeup.
560 *
561 * @dev: Device to handle
562 * @next: impending interrupt/wakeup for the device
563 *
564 *
565 * Allow devices to inform of the next wakeup. It's assumed that the users
566 * guarantee that the genpd wouldn't be detached while this routine is getting
567 * called. Additionally, it's also assumed that @dev isn't runtime suspended
568 * (RPM_SUSPENDED)."
569 * Although devices are expected to update the next_wakeup after the end of
570 * their usecase as well, it is possible the devices themselves may not know
571 * about that, so stale @next will be ignored when powering off the domain.
572 */
573void dev_pm_genpd_set_next_wakeup(struct device *dev, ktime_t next)
574{
575 struct generic_pm_domain *genpd;
576 struct gpd_timing_data *td;
577
578 genpd = dev_to_genpd_safe(dev);
579 if (!genpd)
580 return;
581
582 td = to_gpd_data(dev->power.subsys_data->domain_data)->td;
583 if (td)
584 td->next_wakeup = next;
585}
586EXPORT_SYMBOL_GPL(dev_pm_genpd_set_next_wakeup);
587
588/**
589 * dev_pm_genpd_get_next_hrtimer - Return the next_hrtimer for the genpd
590 * @dev: A device that is attached to the genpd.
591 *
592 * This routine should typically be called for a device, at the point of when a
593 * GENPD_NOTIFY_PRE_OFF notification has been sent for it.
594 *
595 * Returns the aggregated value of the genpd's next hrtimer or KTIME_MAX if no
596 * valid value have been set.
597 */
598ktime_t dev_pm_genpd_get_next_hrtimer(struct device *dev)
599{
600 struct generic_pm_domain *genpd;
601
602 genpd = dev_to_genpd_safe(dev);
603 if (!genpd)
604 return KTIME_MAX;
605
606 if (genpd->gd)
607 return genpd->gd->next_hrtimer;
608
609 return KTIME_MAX;
610}
611EXPORT_SYMBOL_GPL(dev_pm_genpd_get_next_hrtimer);
612
613/*
614 * dev_pm_genpd_synced_poweroff - Next power off should be synchronous
615 *
616 * @dev: A device that is attached to the genpd.
617 *
618 * Allows a consumer of the genpd to notify the provider that the next power off
619 * should be synchronous.
620 *
621 * It is assumed that the users guarantee that the genpd wouldn't be detached
622 * while this routine is getting called.
623 */
624void dev_pm_genpd_synced_poweroff(struct device *dev)
625{
626 struct generic_pm_domain *genpd;
627
628 genpd = dev_to_genpd_safe(dev);
629 if (!genpd)
630 return;
631
632 genpd_lock(genpd);
633 genpd->synced_poweroff = true;
634 genpd_unlock(genpd);
635}
636EXPORT_SYMBOL_GPL(dev_pm_genpd_synced_poweroff);
637
638/**
639 * dev_pm_genpd_set_hwmode() - Set the HW mode for the device and its PM domain.
640 *
641 * @dev: Device for which the HW-mode should be changed.
642 * @enable: Value to set or unset the HW-mode.
643 *
644 * Some PM domains can rely on HW signals to control the power for a device. To
645 * allow a consumer driver to switch the behaviour for its device in runtime,
646 * which may be beneficial from a latency or energy point of view, this function
647 * may be called.
648 *
649 * It is assumed that the users guarantee that the genpd wouldn't be detached
650 * while this routine is getting called.
651 *
652 * Return: Returns 0 on success and negative error values on failures.
653 */
654int dev_pm_genpd_set_hwmode(struct device *dev, bool enable)
655{
656 struct generic_pm_domain *genpd;
657 int ret = 0;
658
659 genpd = dev_to_genpd_safe(dev);
660 if (!genpd)
661 return -ENODEV;
662
663 if (!genpd->set_hwmode_dev)
664 return -EOPNOTSUPP;
665
666 genpd_lock(genpd);
667
668 if (dev_gpd_data(dev)->hw_mode == enable)
669 goto out;
670
671 ret = genpd->set_hwmode_dev(genpd, dev, enable);
672 if (!ret)
673 dev_gpd_data(dev)->hw_mode = enable;
674
675out:
676 genpd_unlock(genpd);
677 return ret;
678}
679EXPORT_SYMBOL_GPL(dev_pm_genpd_set_hwmode);
680
681/**
682 * dev_pm_genpd_get_hwmode() - Get the HW mode setting for the device.
683 *
684 * @dev: Device for which the current HW-mode setting should be fetched.
685 *
686 * This helper function allows consumer drivers to fetch the current HW mode
687 * setting of its the device.
688 *
689 * It is assumed that the users guarantee that the genpd wouldn't be detached
690 * while this routine is getting called.
691 *
692 * Return: Returns the HW mode setting of device from SW cached hw_mode.
693 */
694bool dev_pm_genpd_get_hwmode(struct device *dev)
695{
696 return dev_gpd_data(dev)->hw_mode;
697}
698EXPORT_SYMBOL_GPL(dev_pm_genpd_get_hwmode);
699
700static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
701{
702 unsigned int state_idx = genpd->state_idx;
703 ktime_t time_start;
704 s64 elapsed_ns;
705 int ret;
706
707 /* Notify consumers that we are about to power on. */
708 ret = raw_notifier_call_chain_robust(&genpd->power_notifiers,
709 GENPD_NOTIFY_PRE_ON,
710 GENPD_NOTIFY_OFF, NULL);
711 ret = notifier_to_errno(ret);
712 if (ret)
713 return ret;
714
715 if (!genpd->power_on)
716 goto out;
717
718 timed = timed && genpd->gd && !genpd->states[state_idx].fwnode;
719 if (!timed) {
720 ret = genpd->power_on(genpd);
721 if (ret)
722 goto err;
723
724 goto out;
725 }
726
727 time_start = ktime_get();
728 ret = genpd->power_on(genpd);
729 if (ret)
730 goto err;
731
732 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
733 if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns)
734 goto out;
735
736 genpd->states[state_idx].power_on_latency_ns = elapsed_ns;
737 genpd->gd->max_off_time_changed = true;
738 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
739 dev_name(&genpd->dev), "on", elapsed_ns);
740
741out:
742 raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL);
743 genpd->synced_poweroff = false;
744 return 0;
745err:
746 raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF,
747 NULL);
748 return ret;
749}
750
751static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed)
752{
753 unsigned int state_idx = genpd->state_idx;
754 ktime_t time_start;
755 s64 elapsed_ns;
756 int ret;
757
758 /* Notify consumers that we are about to power off. */
759 ret = raw_notifier_call_chain_robust(&genpd->power_notifiers,
760 GENPD_NOTIFY_PRE_OFF,
761 GENPD_NOTIFY_ON, NULL);
762 ret = notifier_to_errno(ret);
763 if (ret)
764 return ret;
765
766 if (!genpd->power_off)
767 goto out;
768
769 timed = timed && genpd->gd && !genpd->states[state_idx].fwnode;
770 if (!timed) {
771 ret = genpd->power_off(genpd);
772 if (ret)
773 goto busy;
774
775 goto out;
776 }
777
778 time_start = ktime_get();
779 ret = genpd->power_off(genpd);
780 if (ret)
781 goto busy;
782
783 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
784 if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns)
785 goto out;
786
787 genpd->states[state_idx].power_off_latency_ns = elapsed_ns;
788 genpd->gd->max_off_time_changed = true;
789 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
790 dev_name(&genpd->dev), "off", elapsed_ns);
791
792out:
793 raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_OFF,
794 NULL);
795 return 0;
796busy:
797 raw_notifier_call_chain(&genpd->power_notifiers, GENPD_NOTIFY_ON, NULL);
798 return ret;
799}
800
801/**
802 * genpd_queue_power_off_work - Queue up the execution of genpd_power_off().
803 * @genpd: PM domain to power off.
804 *
805 * Queue up the execution of genpd_power_off() unless it's already been done
806 * before.
807 */
808static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
809{
810 queue_work(pm_wq, &genpd->power_off_work);
811}
812
813/**
814 * genpd_power_off - Remove power from a given PM domain.
815 * @genpd: PM domain to power down.
816 * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the
817 * RPM status of the releated device is in an intermediate state, not yet turned
818 * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not
819 * be RPM_SUSPENDED, while it tries to power off the PM domain.
820 * @depth: nesting count for lockdep.
821 *
822 * If all of the @genpd's devices have been suspended and all of its subdomains
823 * have been powered down, remove power from @genpd.
824 */
825static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
826 unsigned int depth)
827{
828 struct pm_domain_data *pdd;
829 struct gpd_link *link;
830 unsigned int not_suspended = 0;
831 int ret;
832
833 /*
834 * Do not try to power off the domain in the following situations:
835 * (1) The domain is already in the "power off" state.
836 * (2) System suspend is in progress.
837 */
838 if (!genpd_status_on(genpd) || genpd->prepared_count > 0)
839 return 0;
840
841 /*
842 * Abort power off for the PM domain in the following situations:
843 * (1) The domain is configured as always on.
844 * (2) When the domain has a subdomain being powered on.
845 */
846 if (genpd_is_always_on(genpd) ||
847 genpd_is_rpm_always_on(genpd) ||
848 atomic_read(&genpd->sd_count) > 0)
849 return -EBUSY;
850
851 /*
852 * The children must be in their deepest (powered-off) states to allow
853 * the parent to be powered off. Note that, there's no need for
854 * additional locking, as powering on a child, requires the parent's
855 * lock to be acquired first.
856 */
857 list_for_each_entry(link, &genpd->parent_links, parent_node) {
858 struct generic_pm_domain *child = link->child;
859 if (child->state_idx < child->state_count - 1)
860 return -EBUSY;
861 }
862
863 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
864 /*
865 * Do not allow PM domain to be powered off, when an IRQ safe
866 * device is part of a non-IRQ safe domain.
867 */
868 if (!pm_runtime_suspended(pdd->dev) ||
869 irq_safe_dev_in_sleep_domain(pdd->dev, genpd))
870 not_suspended++;
871 }
872
873 if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on))
874 return -EBUSY;
875
876 if (genpd->gov && genpd->gov->power_down_ok) {
877 if (!genpd->gov->power_down_ok(&genpd->domain))
878 return -EAGAIN;
879 }
880
881 /* Default to shallowest state. */
882 if (!genpd->gov)
883 genpd->state_idx = 0;
884
885 /* Don't power off, if a child domain is waiting to power on. */
886 if (atomic_read(&genpd->sd_count) > 0)
887 return -EBUSY;
888
889 ret = _genpd_power_off(genpd, true);
890 if (ret) {
891 genpd->states[genpd->state_idx].rejected++;
892 return ret;
893 }
894
895 genpd->status = GENPD_STATE_OFF;
896 genpd_update_accounting(genpd);
897 genpd->states[genpd->state_idx].usage++;
898
899 list_for_each_entry(link, &genpd->child_links, child_node) {
900 genpd_sd_counter_dec(link->parent);
901 genpd_lock_nested(link->parent, depth + 1);
902 genpd_power_off(link->parent, false, depth + 1);
903 genpd_unlock(link->parent);
904 }
905
906 return 0;
907}
908
909/**
910 * genpd_power_on - Restore power to a given PM domain and its parents.
911 * @genpd: PM domain to power up.
912 * @depth: nesting count for lockdep.
913 *
914 * Restore power to @genpd and all of its parents so that it is possible to
915 * resume a device belonging to it.
916 */
917static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth)
918{
919 struct gpd_link *link;
920 int ret = 0;
921
922 if (genpd_status_on(genpd))
923 return 0;
924
925 /*
926 * The list is guaranteed not to change while the loop below is being
927 * executed, unless one of the parents' .power_on() callbacks fiddles
928 * with it.
929 */
930 list_for_each_entry(link, &genpd->child_links, child_node) {
931 struct generic_pm_domain *parent = link->parent;
932
933 genpd_sd_counter_inc(parent);
934
935 genpd_lock_nested(parent, depth + 1);
936 ret = genpd_power_on(parent, depth + 1);
937 genpd_unlock(parent);
938
939 if (ret) {
940 genpd_sd_counter_dec(parent);
941 goto err;
942 }
943 }
944
945 ret = _genpd_power_on(genpd, true);
946 if (ret)
947 goto err;
948
949 genpd->status = GENPD_STATE_ON;
950 genpd_update_accounting(genpd);
951
952 return 0;
953
954 err:
955 list_for_each_entry_continue_reverse(link,
956 &genpd->child_links,
957 child_node) {
958 genpd_sd_counter_dec(link->parent);
959 genpd_lock_nested(link->parent, depth + 1);
960 genpd_power_off(link->parent, false, depth + 1);
961 genpd_unlock(link->parent);
962 }
963
964 return ret;
965}
966
967static int genpd_dev_pm_start(struct device *dev)
968{
969 struct generic_pm_domain *genpd = dev_to_genpd(dev);
970
971 return genpd_start_dev(genpd, dev);
972}
973
974static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
975 unsigned long val, void *ptr)
976{
977 struct generic_pm_domain_data *gpd_data;
978 struct device *dev;
979
980 gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
981 dev = gpd_data->base.dev;
982
983 for (;;) {
984 struct generic_pm_domain *genpd = ERR_PTR(-ENODATA);
985 struct pm_domain_data *pdd;
986 struct gpd_timing_data *td;
987
988 spin_lock_irq(&dev->power.lock);
989
990 pdd = dev->power.subsys_data ?
991 dev->power.subsys_data->domain_data : NULL;
992 if (pdd) {
993 td = to_gpd_data(pdd)->td;
994 if (td) {
995 td->constraint_changed = true;
996 genpd = dev_to_genpd(dev);
997 }
998 }
999
1000 spin_unlock_irq(&dev->power.lock);
1001
1002 if (!IS_ERR(genpd)) {
1003 genpd_lock(genpd);
1004 genpd->gd->max_off_time_changed = true;
1005 genpd_unlock(genpd);
1006 }
1007
1008 dev = dev->parent;
1009 if (!dev || dev->power.ignore_children)
1010 break;
1011 }
1012
1013 return NOTIFY_DONE;
1014}
1015
1016/**
1017 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
1018 * @work: Work structure used for scheduling the execution of this function.
1019 */
1020static void genpd_power_off_work_fn(struct work_struct *work)
1021{
1022 struct generic_pm_domain *genpd;
1023
1024 genpd = container_of(work, struct generic_pm_domain, power_off_work);
1025
1026 genpd_lock(genpd);
1027 genpd_power_off(genpd, false, 0);
1028 genpd_unlock(genpd);
1029}
1030
1031/**
1032 * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks
1033 * @dev: Device to handle.
1034 */
1035static int __genpd_runtime_suspend(struct device *dev)
1036{
1037 int (*cb)(struct device *__dev);
1038
1039 if (dev->type && dev->type->pm)
1040 cb = dev->type->pm->runtime_suspend;
1041 else if (dev->class && dev->class->pm)
1042 cb = dev->class->pm->runtime_suspend;
1043 else if (dev->bus && dev->bus->pm)
1044 cb = dev->bus->pm->runtime_suspend;
1045 else
1046 cb = NULL;
1047
1048 if (!cb && dev->driver && dev->driver->pm)
1049 cb = dev->driver->pm->runtime_suspend;
1050
1051 return cb ? cb(dev) : 0;
1052}
1053
1054/**
1055 * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks
1056 * @dev: Device to handle.
1057 */
1058static int __genpd_runtime_resume(struct device *dev)
1059{
1060 int (*cb)(struct device *__dev);
1061
1062 if (dev->type && dev->type->pm)
1063 cb = dev->type->pm->runtime_resume;
1064 else if (dev->class && dev->class->pm)
1065 cb = dev->class->pm->runtime_resume;
1066 else if (dev->bus && dev->bus->pm)
1067 cb = dev->bus->pm->runtime_resume;
1068 else
1069 cb = NULL;
1070
1071 if (!cb && dev->driver && dev->driver->pm)
1072 cb = dev->driver->pm->runtime_resume;
1073
1074 return cb ? cb(dev) : 0;
1075}
1076
1077/**
1078 * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
1079 * @dev: Device to suspend.
1080 *
1081 * Carry out a runtime suspend of a device under the assumption that its
1082 * pm_domain field points to the domain member of an object of type
1083 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
1084 */
1085static int genpd_runtime_suspend(struct device *dev)
1086{
1087 struct generic_pm_domain *genpd;
1088 bool (*suspend_ok)(struct device *__dev);
1089 struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev);
1090 struct gpd_timing_data *td = gpd_data->td;
1091 bool runtime_pm = pm_runtime_enabled(dev);
1092 ktime_t time_start = 0;
1093 s64 elapsed_ns;
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 /*
1103 * A runtime PM centric subsystem/driver may re-use the runtime PM
1104 * callbacks for other purposes than runtime PM. In those scenarios
1105 * runtime PM is disabled. Under these circumstances, we shall skip
1106 * validating/measuring the PM QoS latency.
1107 */
1108 suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL;
1109 if (runtime_pm && suspend_ok && !suspend_ok(dev))
1110 return -EBUSY;
1111
1112 /* Measure suspend latency. */
1113 if (td && runtime_pm)
1114 time_start = ktime_get();
1115
1116 ret = __genpd_runtime_suspend(dev);
1117 if (ret)
1118 return ret;
1119
1120 ret = genpd_stop_dev(genpd, dev);
1121 if (ret) {
1122 __genpd_runtime_resume(dev);
1123 return ret;
1124 }
1125
1126 /* Update suspend latency value if the measured time exceeds it. */
1127 if (td && runtime_pm) {
1128 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
1129 if (elapsed_ns > td->suspend_latency_ns) {
1130 td->suspend_latency_ns = elapsed_ns;
1131 dev_dbg(dev, "suspend latency exceeded, %lld ns\n",
1132 elapsed_ns);
1133 genpd->gd->max_off_time_changed = true;
1134 td->constraint_changed = true;
1135 }
1136 }
1137
1138 /*
1139 * If power.irq_safe is set, this routine may be run with
1140 * IRQs disabled, so suspend only if the PM domain also is irq_safe.
1141 */
1142 if (irq_safe_dev_in_sleep_domain(dev, genpd))
1143 return 0;
1144
1145 genpd_lock(genpd);
1146 genpd_power_off(genpd, true, 0);
1147 gpd_data->rpm_pstate = genpd_drop_performance_state(dev);
1148 genpd_unlock(genpd);
1149
1150 return 0;
1151}
1152
1153/**
1154 * genpd_runtime_resume - Resume a device belonging to I/O PM domain.
1155 * @dev: Device to resume.
1156 *
1157 * Carry out a runtime resume of a device under the assumption that its
1158 * pm_domain field points to the domain member of an object of type
1159 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
1160 */
1161static int genpd_runtime_resume(struct device *dev)
1162{
1163 struct generic_pm_domain *genpd;
1164 struct generic_pm_domain_data *gpd_data = dev_gpd_data(dev);
1165 struct gpd_timing_data *td = gpd_data->td;
1166 bool timed = td && pm_runtime_enabled(dev);
1167 ktime_t time_start = 0;
1168 s64 elapsed_ns;
1169 int ret;
1170
1171 dev_dbg(dev, "%s()\n", __func__);
1172
1173 genpd = dev_to_genpd(dev);
1174 if (IS_ERR(genpd))
1175 return -EINVAL;
1176
1177 /*
1178 * As we don't power off a non IRQ safe domain, which holds
1179 * an IRQ safe device, we don't need to restore power to it.
1180 */
1181 if (irq_safe_dev_in_sleep_domain(dev, genpd))
1182 goto out;
1183
1184 genpd_lock(genpd);
1185 genpd_restore_performance_state(dev, gpd_data->rpm_pstate);
1186 ret = genpd_power_on(genpd, 0);
1187 genpd_unlock(genpd);
1188
1189 if (ret)
1190 return ret;
1191
1192 out:
1193 /* Measure resume latency. */
1194 if (timed)
1195 time_start = ktime_get();
1196
1197 ret = genpd_start_dev(genpd, dev);
1198 if (ret)
1199 goto err_poweroff;
1200
1201 ret = __genpd_runtime_resume(dev);
1202 if (ret)
1203 goto err_stop;
1204
1205 /* Update resume latency value if the measured time exceeds it. */
1206 if (timed) {
1207 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
1208 if (elapsed_ns > td->resume_latency_ns) {
1209 td->resume_latency_ns = elapsed_ns;
1210 dev_dbg(dev, "resume latency exceeded, %lld ns\n",
1211 elapsed_ns);
1212 genpd->gd->max_off_time_changed = true;
1213 td->constraint_changed = true;
1214 }
1215 }
1216
1217 return 0;
1218
1219err_stop:
1220 genpd_stop_dev(genpd, dev);
1221err_poweroff:
1222 if (!pm_runtime_is_irq_safe(dev) || genpd_is_irq_safe(genpd)) {
1223 genpd_lock(genpd);
1224 genpd_power_off(genpd, true, 0);
1225 gpd_data->rpm_pstate = genpd_drop_performance_state(dev);
1226 genpd_unlock(genpd);
1227 }
1228
1229 return ret;
1230}
1231
1232static bool pd_ignore_unused;
1233static int __init pd_ignore_unused_setup(char *__unused)
1234{
1235 pd_ignore_unused = true;
1236 return 1;
1237}
1238__setup("pd_ignore_unused", pd_ignore_unused_setup);
1239
1240/**
1241 * genpd_power_off_unused - Power off all PM domains with no devices in use.
1242 */
1243static int __init genpd_power_off_unused(void)
1244{
1245 struct generic_pm_domain *genpd;
1246
1247 if (pd_ignore_unused) {
1248 pr_warn("genpd: Not disabling unused power domains\n");
1249 return 0;
1250 }
1251
1252 pr_info("genpd: Disabling unused power domains\n");
1253 mutex_lock(&gpd_list_lock);
1254
1255 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
1256 genpd_queue_power_off_work(genpd);
1257
1258 mutex_unlock(&gpd_list_lock);
1259
1260 return 0;
1261}
1262late_initcall_sync(genpd_power_off_unused);
1263
1264#ifdef CONFIG_PM_SLEEP
1265
1266/**
1267 * genpd_sync_power_off - Synchronously power off a PM domain and its parents.
1268 * @genpd: PM domain to power off, if possible.
1269 * @use_lock: use the lock.
1270 * @depth: nesting count for lockdep.
1271 *
1272 * Check if the given PM domain can be powered off (during system suspend or
1273 * hibernation) and do that if so. Also, in that case propagate to its parents.
1274 *
1275 * This function is only called in "noirq" and "syscore" stages of system power
1276 * transitions. The "noirq" callbacks may be executed asynchronously, thus in
1277 * these cases the lock must be held.
1278 */
1279static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock,
1280 unsigned int depth)
1281{
1282 struct gpd_link *link;
1283
1284 if (!genpd_status_on(genpd) || genpd_is_always_on(genpd))
1285 return;
1286
1287 if (genpd->suspended_count != genpd->device_count
1288 || atomic_read(&genpd->sd_count) > 0)
1289 return;
1290
1291 /* Check that the children are in their deepest (powered-off) state. */
1292 list_for_each_entry(link, &genpd->parent_links, parent_node) {
1293 struct generic_pm_domain *child = link->child;
1294 if (child->state_idx < child->state_count - 1)
1295 return;
1296 }
1297
1298 /* Choose the deepest state when suspending */
1299 genpd->state_idx = genpd->state_count - 1;
1300 if (_genpd_power_off(genpd, false)) {
1301 genpd->states[genpd->state_idx].rejected++;
1302 return;
1303 } else {
1304 genpd->states[genpd->state_idx].usage++;
1305 }
1306
1307 genpd->status = GENPD_STATE_OFF;
1308
1309 list_for_each_entry(link, &genpd->child_links, child_node) {
1310 genpd_sd_counter_dec(link->parent);
1311
1312 if (use_lock)
1313 genpd_lock_nested(link->parent, depth + 1);
1314
1315 genpd_sync_power_off(link->parent, use_lock, depth + 1);
1316
1317 if (use_lock)
1318 genpd_unlock(link->parent);
1319 }
1320}
1321
1322/**
1323 * genpd_sync_power_on - Synchronously power on a PM domain and its parents.
1324 * @genpd: PM domain to power on.
1325 * @use_lock: use the lock.
1326 * @depth: nesting count for lockdep.
1327 *
1328 * This function is only called in "noirq" and "syscore" stages of system power
1329 * transitions. The "noirq" callbacks may be executed asynchronously, thus in
1330 * these cases the lock must be held.
1331 */
1332static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock,
1333 unsigned int depth)
1334{
1335 struct gpd_link *link;
1336
1337 if (genpd_status_on(genpd))
1338 return;
1339
1340 list_for_each_entry(link, &genpd->child_links, child_node) {
1341 genpd_sd_counter_inc(link->parent);
1342
1343 if (use_lock)
1344 genpd_lock_nested(link->parent, depth + 1);
1345
1346 genpd_sync_power_on(link->parent, use_lock, depth + 1);
1347
1348 if (use_lock)
1349 genpd_unlock(link->parent);
1350 }
1351
1352 _genpd_power_on(genpd, false);
1353 genpd->status = GENPD_STATE_ON;
1354}
1355
1356/**
1357 * genpd_prepare - Start power transition of a device in a PM domain.
1358 * @dev: Device to start the transition of.
1359 *
1360 * Start a power transition of a device (during a system-wide power transition)
1361 * under the assumption that its pm_domain field points to the domain member of
1362 * an object of type struct generic_pm_domain representing a PM domain
1363 * consisting of I/O devices.
1364 */
1365static int genpd_prepare(struct device *dev)
1366{
1367 struct generic_pm_domain *genpd;
1368 int ret;
1369
1370 dev_dbg(dev, "%s()\n", __func__);
1371
1372 genpd = dev_to_genpd(dev);
1373 if (IS_ERR(genpd))
1374 return -EINVAL;
1375
1376 genpd_lock(genpd);
1377 genpd->prepared_count++;
1378 genpd_unlock(genpd);
1379
1380 ret = pm_generic_prepare(dev);
1381 if (ret < 0) {
1382 genpd_lock(genpd);
1383
1384 genpd->prepared_count--;
1385
1386 genpd_unlock(genpd);
1387 }
1388
1389 /* Never return 1, as genpd don't cope with the direct_complete path. */
1390 return ret >= 0 ? 0 : ret;
1391}
1392
1393/**
1394 * genpd_finish_suspend - Completion of suspend or hibernation of device in an
1395 * I/O pm domain.
1396 * @dev: Device to suspend.
1397 * @suspend_noirq: Generic suspend_noirq callback.
1398 * @resume_noirq: Generic resume_noirq callback.
1399 *
1400 * Stop the device and remove power from the domain if all devices in it have
1401 * been stopped.
1402 */
1403static int genpd_finish_suspend(struct device *dev,
1404 int (*suspend_noirq)(struct device *dev),
1405 int (*resume_noirq)(struct device *dev))
1406{
1407 struct generic_pm_domain *genpd;
1408 int ret = 0;
1409
1410 genpd = dev_to_genpd(dev);
1411 if (IS_ERR(genpd))
1412 return -EINVAL;
1413
1414 ret = suspend_noirq(dev);
1415 if (ret)
1416 return ret;
1417
1418 if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd))
1419 return 0;
1420
1421 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1422 !pm_runtime_status_suspended(dev)) {
1423 ret = genpd_stop_dev(genpd, dev);
1424 if (ret) {
1425 resume_noirq(dev);
1426 return ret;
1427 }
1428 }
1429
1430 genpd_lock(genpd);
1431 genpd->suspended_count++;
1432 genpd_sync_power_off(genpd, true, 0);
1433 genpd_unlock(genpd);
1434
1435 return 0;
1436}
1437
1438/**
1439 * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
1440 * @dev: Device to suspend.
1441 *
1442 * Stop the device and remove power from the domain if all devices in it have
1443 * been stopped.
1444 */
1445static int genpd_suspend_noirq(struct device *dev)
1446{
1447 dev_dbg(dev, "%s()\n", __func__);
1448
1449 return genpd_finish_suspend(dev,
1450 pm_generic_suspend_noirq,
1451 pm_generic_resume_noirq);
1452}
1453
1454/**
1455 * genpd_finish_resume - Completion of resume of device in an I/O PM domain.
1456 * @dev: Device to resume.
1457 * @resume_noirq: Generic resume_noirq callback.
1458 *
1459 * Restore power to the device's PM domain, if necessary, and start the device.
1460 */
1461static int genpd_finish_resume(struct device *dev,
1462 int (*resume_noirq)(struct device *dev))
1463{
1464 struct generic_pm_domain *genpd;
1465 int ret;
1466
1467 dev_dbg(dev, "%s()\n", __func__);
1468
1469 genpd = dev_to_genpd(dev);
1470 if (IS_ERR(genpd))
1471 return -EINVAL;
1472
1473 if (device_wakeup_path(dev) && genpd_is_active_wakeup(genpd))
1474 return resume_noirq(dev);
1475
1476 genpd_lock(genpd);
1477 genpd_sync_power_on(genpd, true, 0);
1478 genpd->suspended_count--;
1479 genpd_unlock(genpd);
1480
1481 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1482 !pm_runtime_status_suspended(dev)) {
1483 ret = genpd_start_dev(genpd, dev);
1484 if (ret)
1485 return ret;
1486 }
1487
1488 return pm_generic_resume_noirq(dev);
1489}
1490
1491/**
1492 * genpd_resume_noirq - Start of resume of device in an I/O PM domain.
1493 * @dev: Device to resume.
1494 *
1495 * Restore power to the device's PM domain, if necessary, and start the device.
1496 */
1497static int genpd_resume_noirq(struct device *dev)
1498{
1499 dev_dbg(dev, "%s()\n", __func__);
1500
1501 return genpd_finish_resume(dev, pm_generic_resume_noirq);
1502}
1503
1504/**
1505 * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
1506 * @dev: Device to freeze.
1507 *
1508 * Carry out a late freeze of a device under the assumption that its
1509 * pm_domain field points to the domain member of an object of type
1510 * struct generic_pm_domain representing a power domain consisting of I/O
1511 * devices.
1512 */
1513static int genpd_freeze_noirq(struct device *dev)
1514{
1515 dev_dbg(dev, "%s()\n", __func__);
1516
1517 return genpd_finish_suspend(dev,
1518 pm_generic_freeze_noirq,
1519 pm_generic_thaw_noirq);
1520}
1521
1522/**
1523 * genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
1524 * @dev: Device to thaw.
1525 *
1526 * Start the device, unless power has been removed from the domain already
1527 * before the system transition.
1528 */
1529static int genpd_thaw_noirq(struct device *dev)
1530{
1531 dev_dbg(dev, "%s()\n", __func__);
1532
1533 return genpd_finish_resume(dev, pm_generic_thaw_noirq);
1534}
1535
1536/**
1537 * genpd_poweroff_noirq - Completion of hibernation of device in an
1538 * I/O PM domain.
1539 * @dev: Device to poweroff.
1540 *
1541 * Stop the device and remove power from the domain if all devices in it have
1542 * been stopped.
1543 */
1544static int genpd_poweroff_noirq(struct device *dev)
1545{
1546 dev_dbg(dev, "%s()\n", __func__);
1547
1548 return genpd_finish_suspend(dev,
1549 pm_generic_poweroff_noirq,
1550 pm_generic_restore_noirq);
1551}
1552
1553/**
1554 * genpd_restore_noirq - Start of restore of device in an I/O PM domain.
1555 * @dev: Device to resume.
1556 *
1557 * Make sure the domain will be in the same power state as before the
1558 * hibernation the system is resuming from and start the device if necessary.
1559 */
1560static int genpd_restore_noirq(struct device *dev)
1561{
1562 dev_dbg(dev, "%s()\n", __func__);
1563
1564 return genpd_finish_resume(dev, pm_generic_restore_noirq);
1565}
1566
1567/**
1568 * genpd_complete - Complete power transition of a device in a power domain.
1569 * @dev: Device to complete the transition of.
1570 *
1571 * Complete a power transition of a device (during a system-wide power
1572 * transition) under the assumption that its pm_domain field points to the
1573 * domain member of an object of type struct generic_pm_domain representing
1574 * a power domain consisting of I/O devices.
1575 */
1576static void genpd_complete(struct device *dev)
1577{
1578 struct generic_pm_domain *genpd;
1579
1580 dev_dbg(dev, "%s()\n", __func__);
1581
1582 genpd = dev_to_genpd(dev);
1583 if (IS_ERR(genpd))
1584 return;
1585
1586 pm_generic_complete(dev);
1587
1588 genpd_lock(genpd);
1589
1590 genpd->prepared_count--;
1591 if (!genpd->prepared_count)
1592 genpd_queue_power_off_work(genpd);
1593
1594 genpd_unlock(genpd);
1595}
1596
1597static void genpd_switch_state(struct device *dev, bool suspend)
1598{
1599 struct generic_pm_domain *genpd;
1600 bool use_lock;
1601
1602 genpd = dev_to_genpd_safe(dev);
1603 if (!genpd)
1604 return;
1605
1606 use_lock = genpd_is_irq_safe(genpd);
1607
1608 if (use_lock)
1609 genpd_lock(genpd);
1610
1611 if (suspend) {
1612 genpd->suspended_count++;
1613 genpd_sync_power_off(genpd, use_lock, 0);
1614 } else {
1615 genpd_sync_power_on(genpd, use_lock, 0);
1616 genpd->suspended_count--;
1617 }
1618
1619 if (use_lock)
1620 genpd_unlock(genpd);
1621}
1622
1623/**
1624 * dev_pm_genpd_suspend - Synchronously try to suspend the genpd for @dev
1625 * @dev: The device that is attached to the genpd, that can be suspended.
1626 *
1627 * This routine should typically be called for a device that needs to be
1628 * suspended during the syscore suspend phase. It may also be called during
1629 * suspend-to-idle to suspend a corresponding CPU device that is attached to a
1630 * genpd.
1631 */
1632void dev_pm_genpd_suspend(struct device *dev)
1633{
1634 genpd_switch_state(dev, true);
1635}
1636EXPORT_SYMBOL_GPL(dev_pm_genpd_suspend);
1637
1638/**
1639 * dev_pm_genpd_resume - Synchronously try to resume the genpd for @dev
1640 * @dev: The device that is attached to the genpd, which needs to be resumed.
1641 *
1642 * This routine should typically be called for a device that needs to be resumed
1643 * during the syscore resume phase. It may also be called during suspend-to-idle
1644 * to resume a corresponding CPU device that is attached to a genpd.
1645 */
1646void dev_pm_genpd_resume(struct device *dev)
1647{
1648 genpd_switch_state(dev, false);
1649}
1650EXPORT_SYMBOL_GPL(dev_pm_genpd_resume);
1651
1652#else /* !CONFIG_PM_SLEEP */
1653
1654#define genpd_prepare NULL
1655#define genpd_suspend_noirq NULL
1656#define genpd_resume_noirq NULL
1657#define genpd_freeze_noirq NULL
1658#define genpd_thaw_noirq NULL
1659#define genpd_poweroff_noirq NULL
1660#define genpd_restore_noirq NULL
1661#define genpd_complete NULL
1662
1663#endif /* CONFIG_PM_SLEEP */
1664
1665static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev,
1666 bool has_governor)
1667{
1668 struct generic_pm_domain_data *gpd_data;
1669 struct gpd_timing_data *td;
1670 int ret;
1671
1672 ret = dev_pm_get_subsys_data(dev);
1673 if (ret)
1674 return ERR_PTR(ret);
1675
1676 gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
1677 if (!gpd_data) {
1678 ret = -ENOMEM;
1679 goto err_put;
1680 }
1681
1682 gpd_data->base.dev = dev;
1683 gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
1684
1685 /* Allocate data used by a governor. */
1686 if (has_governor) {
1687 td = kzalloc(sizeof(*td), GFP_KERNEL);
1688 if (!td) {
1689 ret = -ENOMEM;
1690 goto err_free;
1691 }
1692
1693 td->constraint_changed = true;
1694 td->effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS;
1695 td->next_wakeup = KTIME_MAX;
1696 gpd_data->td = td;
1697 }
1698
1699 spin_lock_irq(&dev->power.lock);
1700
1701 if (dev->power.subsys_data->domain_data)
1702 ret = -EINVAL;
1703 else
1704 dev->power.subsys_data->domain_data = &gpd_data->base;
1705
1706 spin_unlock_irq(&dev->power.lock);
1707
1708 if (ret)
1709 goto err_free;
1710
1711 return gpd_data;
1712
1713 err_free:
1714 kfree(gpd_data->td);
1715 kfree(gpd_data);
1716 err_put:
1717 dev_pm_put_subsys_data(dev);
1718 return ERR_PTR(ret);
1719}
1720
1721static void genpd_free_dev_data(struct device *dev,
1722 struct generic_pm_domain_data *gpd_data)
1723{
1724 spin_lock_irq(&dev->power.lock);
1725
1726 dev->power.subsys_data->domain_data = NULL;
1727
1728 spin_unlock_irq(&dev->power.lock);
1729
1730 dev_pm_opp_clear_config(gpd_data->opp_token);
1731 kfree(gpd_data->td);
1732 kfree(gpd_data);
1733 dev_pm_put_subsys_data(dev);
1734}
1735
1736static void genpd_update_cpumask(struct generic_pm_domain *genpd,
1737 int cpu, bool set, unsigned int depth)
1738{
1739 struct gpd_link *link;
1740
1741 if (!genpd_is_cpu_domain(genpd))
1742 return;
1743
1744 list_for_each_entry(link, &genpd->child_links, child_node) {
1745 struct generic_pm_domain *parent = link->parent;
1746
1747 genpd_lock_nested(parent, depth + 1);
1748 genpd_update_cpumask(parent, cpu, set, depth + 1);
1749 genpd_unlock(parent);
1750 }
1751
1752 if (set)
1753 cpumask_set_cpu(cpu, genpd->cpus);
1754 else
1755 cpumask_clear_cpu(cpu, genpd->cpus);
1756}
1757
1758static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu)
1759{
1760 if (cpu >= 0)
1761 genpd_update_cpumask(genpd, cpu, true, 0);
1762}
1763
1764static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu)
1765{
1766 if (cpu >= 0)
1767 genpd_update_cpumask(genpd, cpu, false, 0);
1768}
1769
1770static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev)
1771{
1772 int cpu;
1773
1774 if (!genpd_is_cpu_domain(genpd))
1775 return -1;
1776
1777 for_each_possible_cpu(cpu) {
1778 if (get_cpu_device(cpu) == dev)
1779 return cpu;
1780 }
1781
1782 return -1;
1783}
1784
1785static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
1786 struct device *base_dev)
1787{
1788 struct genpd_governor_data *gd = genpd->gd;
1789 struct generic_pm_domain_data *gpd_data;
1790 int ret;
1791
1792 dev_dbg(dev, "%s()\n", __func__);
1793
1794 gpd_data = genpd_alloc_dev_data(dev, gd);
1795 if (IS_ERR(gpd_data))
1796 return PTR_ERR(gpd_data);
1797
1798 gpd_data->cpu = genpd_get_cpu(genpd, base_dev);
1799
1800 gpd_data->hw_mode = genpd->get_hwmode_dev ? genpd->get_hwmode_dev(genpd, dev) : false;
1801
1802 ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
1803 if (ret)
1804 goto out;
1805
1806 genpd_lock(genpd);
1807
1808 genpd_set_cpumask(genpd, gpd_data->cpu);
1809
1810 genpd->device_count++;
1811 if (gd)
1812 gd->max_off_time_changed = true;
1813
1814 list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
1815
1816 genpd_unlock(genpd);
1817 dev_pm_domain_set(dev, &genpd->domain);
1818 out:
1819 if (ret)
1820 genpd_free_dev_data(dev, gpd_data);
1821 else
1822 dev_pm_qos_add_notifier(dev, &gpd_data->nb,
1823 DEV_PM_QOS_RESUME_LATENCY);
1824
1825 return ret;
1826}
1827
1828/**
1829 * pm_genpd_add_device - Add a device to an I/O PM domain.
1830 * @genpd: PM domain to add the device to.
1831 * @dev: Device to be added.
1832 */
1833int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
1834{
1835 int ret;
1836
1837 if (!genpd || !dev)
1838 return -EINVAL;
1839
1840 mutex_lock(&gpd_list_lock);
1841 ret = genpd_add_device(genpd, dev, dev);
1842 mutex_unlock(&gpd_list_lock);
1843
1844 return ret;
1845}
1846EXPORT_SYMBOL_GPL(pm_genpd_add_device);
1847
1848static int genpd_remove_device(struct generic_pm_domain *genpd,
1849 struct device *dev)
1850{
1851 struct generic_pm_domain_data *gpd_data;
1852 struct pm_domain_data *pdd;
1853 int ret = 0;
1854
1855 dev_dbg(dev, "%s()\n", __func__);
1856
1857 pdd = dev->power.subsys_data->domain_data;
1858 gpd_data = to_gpd_data(pdd);
1859 dev_pm_qos_remove_notifier(dev, &gpd_data->nb,
1860 DEV_PM_QOS_RESUME_LATENCY);
1861
1862 genpd_lock(genpd);
1863
1864 if (genpd->prepared_count > 0) {
1865 ret = -EAGAIN;
1866 goto out;
1867 }
1868
1869 genpd->device_count--;
1870 if (genpd->gd)
1871 genpd->gd->max_off_time_changed = true;
1872
1873 genpd_clear_cpumask(genpd, gpd_data->cpu);
1874
1875 list_del_init(&pdd->list_node);
1876
1877 genpd_unlock(genpd);
1878
1879 dev_pm_domain_set(dev, NULL);
1880
1881 if (genpd->detach_dev)
1882 genpd->detach_dev(genpd, dev);
1883
1884 genpd_free_dev_data(dev, gpd_data);
1885
1886 return 0;
1887
1888 out:
1889 genpd_unlock(genpd);
1890 dev_pm_qos_add_notifier(dev, &gpd_data->nb, DEV_PM_QOS_RESUME_LATENCY);
1891
1892 return ret;
1893}
1894
1895/**
1896 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
1897 * @dev: Device to be removed.
1898 */
1899int pm_genpd_remove_device(struct device *dev)
1900{
1901 struct generic_pm_domain *genpd = dev_to_genpd_safe(dev);
1902
1903 if (!genpd)
1904 return -EINVAL;
1905
1906 return genpd_remove_device(genpd, dev);
1907}
1908EXPORT_SYMBOL_GPL(pm_genpd_remove_device);
1909
1910/**
1911 * dev_pm_genpd_add_notifier - Add a genpd power on/off notifier for @dev
1912 *
1913 * @dev: Device that should be associated with the notifier
1914 * @nb: The notifier block to register
1915 *
1916 * Users may call this function to add a genpd power on/off notifier for an
1917 * attached @dev. Only one notifier per device is allowed. The notifier is
1918 * sent when genpd is powering on/off the PM domain.
1919 *
1920 * It is assumed that the user guarantee that the genpd wouldn't be detached
1921 * while this routine is getting called.
1922 *
1923 * Returns 0 on success and negative error values on failures.
1924 */
1925int dev_pm_genpd_add_notifier(struct device *dev, struct notifier_block *nb)
1926{
1927 struct generic_pm_domain *genpd;
1928 struct generic_pm_domain_data *gpd_data;
1929 int ret;
1930
1931 genpd = dev_to_genpd_safe(dev);
1932 if (!genpd)
1933 return -ENODEV;
1934
1935 if (WARN_ON(!dev->power.subsys_data ||
1936 !dev->power.subsys_data->domain_data))
1937 return -EINVAL;
1938
1939 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
1940 if (gpd_data->power_nb)
1941 return -EEXIST;
1942
1943 genpd_lock(genpd);
1944 ret = raw_notifier_chain_register(&genpd->power_notifiers, nb);
1945 genpd_unlock(genpd);
1946
1947 if (ret) {
1948 dev_warn(dev, "failed to add notifier for PM domain %s\n",
1949 dev_name(&genpd->dev));
1950 return ret;
1951 }
1952
1953 gpd_data->power_nb = nb;
1954 return 0;
1955}
1956EXPORT_SYMBOL_GPL(dev_pm_genpd_add_notifier);
1957
1958/**
1959 * dev_pm_genpd_remove_notifier - Remove a genpd power on/off notifier for @dev
1960 *
1961 * @dev: Device that is associated with the notifier
1962 *
1963 * Users may call this function to remove a genpd power on/off notifier for an
1964 * attached @dev.
1965 *
1966 * It is assumed that the user guarantee that the genpd wouldn't be detached
1967 * while this routine is getting called.
1968 *
1969 * Returns 0 on success and negative error values on failures.
1970 */
1971int dev_pm_genpd_remove_notifier(struct device *dev)
1972{
1973 struct generic_pm_domain *genpd;
1974 struct generic_pm_domain_data *gpd_data;
1975 int ret;
1976
1977 genpd = dev_to_genpd_safe(dev);
1978 if (!genpd)
1979 return -ENODEV;
1980
1981 if (WARN_ON(!dev->power.subsys_data ||
1982 !dev->power.subsys_data->domain_data))
1983 return -EINVAL;
1984
1985 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
1986 if (!gpd_data->power_nb)
1987 return -ENODEV;
1988
1989 genpd_lock(genpd);
1990 ret = raw_notifier_chain_unregister(&genpd->power_notifiers,
1991 gpd_data->power_nb);
1992 genpd_unlock(genpd);
1993
1994 if (ret) {
1995 dev_warn(dev, "failed to remove notifier for PM domain %s\n",
1996 dev_name(&genpd->dev));
1997 return ret;
1998 }
1999
2000 gpd_data->power_nb = NULL;
2001 return 0;
2002}
2003EXPORT_SYMBOL_GPL(dev_pm_genpd_remove_notifier);
2004
2005static int genpd_add_subdomain(struct generic_pm_domain *genpd,
2006 struct generic_pm_domain *subdomain)
2007{
2008 struct gpd_link *link, *itr;
2009 int ret = 0;
2010
2011 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
2012 || genpd == subdomain)
2013 return -EINVAL;
2014
2015 /*
2016 * If the domain can be powered on/off in an IRQ safe
2017 * context, ensure that the subdomain can also be
2018 * powered on/off in that context.
2019 */
2020 if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) {
2021 WARN(1, "Parent %s of subdomain %s must be IRQ safe\n",
2022 dev_name(&genpd->dev), subdomain->name);
2023 return -EINVAL;
2024 }
2025
2026 link = kzalloc(sizeof(*link), GFP_KERNEL);
2027 if (!link)
2028 return -ENOMEM;
2029
2030 genpd_lock(subdomain);
2031 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
2032
2033 if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) {
2034 ret = -EINVAL;
2035 goto out;
2036 }
2037
2038 list_for_each_entry(itr, &genpd->parent_links, parent_node) {
2039 if (itr->child == subdomain && itr->parent == genpd) {
2040 ret = -EINVAL;
2041 goto out;
2042 }
2043 }
2044
2045 link->parent = genpd;
2046 list_add_tail(&link->parent_node, &genpd->parent_links);
2047 link->child = subdomain;
2048 list_add_tail(&link->child_node, &subdomain->child_links);
2049 if (genpd_status_on(subdomain))
2050 genpd_sd_counter_inc(genpd);
2051
2052 out:
2053 genpd_unlock(genpd);
2054 genpd_unlock(subdomain);
2055 if (ret)
2056 kfree(link);
2057 return ret;
2058}
2059
2060/**
2061 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
2062 * @genpd: Leader PM domain to add the subdomain to.
2063 * @subdomain: Subdomain to be added.
2064 */
2065int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
2066 struct generic_pm_domain *subdomain)
2067{
2068 int ret;
2069
2070 mutex_lock(&gpd_list_lock);
2071 ret = genpd_add_subdomain(genpd, subdomain);
2072 mutex_unlock(&gpd_list_lock);
2073
2074 return ret;
2075}
2076EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain);
2077
2078/**
2079 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
2080 * @genpd: Leader PM domain to remove the subdomain from.
2081 * @subdomain: Subdomain to be removed.
2082 */
2083int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
2084 struct generic_pm_domain *subdomain)
2085{
2086 struct gpd_link *l, *link;
2087 int ret = -EINVAL;
2088
2089 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
2090 return -EINVAL;
2091
2092 genpd_lock(subdomain);
2093 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
2094
2095 if (!list_empty(&subdomain->parent_links) || subdomain->device_count) {
2096 pr_warn("%s: unable to remove subdomain %s\n",
2097 dev_name(&genpd->dev), subdomain->name);
2098 ret = -EBUSY;
2099 goto out;
2100 }
2101
2102 list_for_each_entry_safe(link, l, &genpd->parent_links, parent_node) {
2103 if (link->child != subdomain)
2104 continue;
2105
2106 list_del(&link->parent_node);
2107 list_del(&link->child_node);
2108 kfree(link);
2109 if (genpd_status_on(subdomain))
2110 genpd_sd_counter_dec(genpd);
2111
2112 ret = 0;
2113 break;
2114 }
2115
2116out:
2117 genpd_unlock(genpd);
2118 genpd_unlock(subdomain);
2119
2120 return ret;
2121}
2122EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain);
2123
2124static void genpd_free_default_power_state(struct genpd_power_state *states,
2125 unsigned int state_count)
2126{
2127 kfree(states);
2128}
2129
2130static int genpd_set_default_power_state(struct generic_pm_domain *genpd)
2131{
2132 struct genpd_power_state *state;
2133
2134 state = kzalloc(sizeof(*state), GFP_KERNEL);
2135 if (!state)
2136 return -ENOMEM;
2137
2138 genpd->states = state;
2139 genpd->state_count = 1;
2140 genpd->free_states = genpd_free_default_power_state;
2141
2142 return 0;
2143}
2144
2145static void genpd_provider_release(struct device *dev)
2146{
2147 /* nothing to be done here */
2148}
2149
2150static int genpd_alloc_data(struct generic_pm_domain *genpd)
2151{
2152 struct genpd_governor_data *gd = NULL;
2153 int ret;
2154
2155 if (genpd_is_cpu_domain(genpd) &&
2156 !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL))
2157 return -ENOMEM;
2158
2159 if (genpd->gov) {
2160 gd = kzalloc(sizeof(*gd), GFP_KERNEL);
2161 if (!gd) {
2162 ret = -ENOMEM;
2163 goto free;
2164 }
2165
2166 gd->max_off_time_ns = -1;
2167 gd->max_off_time_changed = true;
2168 gd->next_wakeup = KTIME_MAX;
2169 gd->next_hrtimer = KTIME_MAX;
2170 }
2171
2172 /* Use only one "off" state if there were no states declared */
2173 if (genpd->state_count == 0) {
2174 ret = genpd_set_default_power_state(genpd);
2175 if (ret)
2176 goto free;
2177 }
2178
2179 genpd->gd = gd;
2180 device_initialize(&genpd->dev);
2181 genpd->dev.release = genpd_provider_release;
2182
2183 if (!genpd_is_dev_name_fw(genpd)) {
2184 dev_set_name(&genpd->dev, "%s", genpd->name);
2185 } else {
2186 ret = ida_alloc(&genpd_ida, GFP_KERNEL);
2187 if (ret < 0)
2188 goto put;
2189
2190 genpd->device_id = ret;
2191 dev_set_name(&genpd->dev, "%s_%u", genpd->name, genpd->device_id);
2192 }
2193
2194 return 0;
2195put:
2196 put_device(&genpd->dev);
2197 if (genpd->free_states == genpd_free_default_power_state)
2198 kfree(genpd->states);
2199free:
2200 if (genpd_is_cpu_domain(genpd))
2201 free_cpumask_var(genpd->cpus);
2202 kfree(gd);
2203 return ret;
2204}
2205
2206static void genpd_free_data(struct generic_pm_domain *genpd)
2207{
2208 put_device(&genpd->dev);
2209 if (genpd->device_id != -ENXIO)
2210 ida_free(&genpd_ida, genpd->device_id);
2211 if (genpd_is_cpu_domain(genpd))
2212 free_cpumask_var(genpd->cpus);
2213 if (genpd->free_states)
2214 genpd->free_states(genpd->states, genpd->state_count);
2215 kfree(genpd->gd);
2216}
2217
2218static void genpd_lock_init(struct generic_pm_domain *genpd)
2219{
2220 if (genpd_is_cpu_domain(genpd)) {
2221 raw_spin_lock_init(&genpd->raw_slock);
2222 genpd->lock_ops = &genpd_raw_spin_ops;
2223 } else if (genpd_is_irq_safe(genpd)) {
2224 spin_lock_init(&genpd->slock);
2225 genpd->lock_ops = &genpd_spin_ops;
2226 } else {
2227 mutex_init(&genpd->mlock);
2228 genpd->lock_ops = &genpd_mtx_ops;
2229 }
2230}
2231
2232/**
2233 * pm_genpd_init - Initialize a generic I/O PM domain object.
2234 * @genpd: PM domain object to initialize.
2235 * @gov: PM domain governor to associate with the domain (may be NULL).
2236 * @is_off: Initial value of the domain's power_is_off field.
2237 *
2238 * Returns 0 on successful initialization, else a negative error code.
2239 */
2240int pm_genpd_init(struct generic_pm_domain *genpd,
2241 struct dev_power_governor *gov, bool is_off)
2242{
2243 int ret;
2244
2245 if (IS_ERR_OR_NULL(genpd))
2246 return -EINVAL;
2247
2248 INIT_LIST_HEAD(&genpd->parent_links);
2249 INIT_LIST_HEAD(&genpd->child_links);
2250 INIT_LIST_HEAD(&genpd->dev_list);
2251 RAW_INIT_NOTIFIER_HEAD(&genpd->power_notifiers);
2252 genpd_lock_init(genpd);
2253 genpd->gov = gov;
2254 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
2255 atomic_set(&genpd->sd_count, 0);
2256 genpd->status = is_off ? GENPD_STATE_OFF : GENPD_STATE_ON;
2257 genpd->device_count = 0;
2258 genpd->provider = NULL;
2259 genpd->device_id = -ENXIO;
2260 genpd->has_provider = false;
2261 genpd->accounting_time = ktime_get_mono_fast_ns();
2262 genpd->domain.ops.runtime_suspend = genpd_runtime_suspend;
2263 genpd->domain.ops.runtime_resume = genpd_runtime_resume;
2264 genpd->domain.ops.prepare = genpd_prepare;
2265 genpd->domain.ops.suspend_noirq = genpd_suspend_noirq;
2266 genpd->domain.ops.resume_noirq = genpd_resume_noirq;
2267 genpd->domain.ops.freeze_noirq = genpd_freeze_noirq;
2268 genpd->domain.ops.thaw_noirq = genpd_thaw_noirq;
2269 genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq;
2270 genpd->domain.ops.restore_noirq = genpd_restore_noirq;
2271 genpd->domain.ops.complete = genpd_complete;
2272 genpd->domain.start = genpd_dev_pm_start;
2273 genpd->domain.set_performance_state = genpd_dev_pm_set_performance_state;
2274
2275 if (genpd->flags & GENPD_FLAG_PM_CLK) {
2276 genpd->dev_ops.stop = pm_clk_suspend;
2277 genpd->dev_ops.start = pm_clk_resume;
2278 }
2279
2280 /* The always-on governor works better with the corresponding flag. */
2281 if (gov == &pm_domain_always_on_gov)
2282 genpd->flags |= GENPD_FLAG_RPM_ALWAYS_ON;
2283
2284 /* Always-on domains must be powered on at initialization. */
2285 if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) &&
2286 !genpd_status_on(genpd)) {
2287 pr_err("always-on PM domain %s is not on\n", genpd->name);
2288 return -EINVAL;
2289 }
2290
2291 /* Multiple states but no governor doesn't make sense. */
2292 if (!gov && genpd->state_count > 1)
2293 pr_warn("%s: no governor for states\n", genpd->name);
2294
2295 ret = genpd_alloc_data(genpd);
2296 if (ret)
2297 return ret;
2298
2299 mutex_lock(&gpd_list_lock);
2300 list_add(&genpd->gpd_list_node, &gpd_list);
2301 mutex_unlock(&gpd_list_lock);
2302 genpd_debug_add(genpd);
2303
2304 return 0;
2305}
2306EXPORT_SYMBOL_GPL(pm_genpd_init);
2307
2308static int genpd_remove(struct generic_pm_domain *genpd)
2309{
2310 struct gpd_link *l, *link;
2311
2312 if (IS_ERR_OR_NULL(genpd))
2313 return -EINVAL;
2314
2315 genpd_lock(genpd);
2316
2317 if (genpd->has_provider) {
2318 genpd_unlock(genpd);
2319 pr_err("Provider present, unable to remove %s\n", dev_name(&genpd->dev));
2320 return -EBUSY;
2321 }
2322
2323 if (!list_empty(&genpd->parent_links) || genpd->device_count) {
2324 genpd_unlock(genpd);
2325 pr_err("%s: unable to remove %s\n", __func__, dev_name(&genpd->dev));
2326 return -EBUSY;
2327 }
2328
2329 list_for_each_entry_safe(link, l, &genpd->child_links, child_node) {
2330 list_del(&link->parent_node);
2331 list_del(&link->child_node);
2332 kfree(link);
2333 }
2334
2335 list_del(&genpd->gpd_list_node);
2336 genpd_unlock(genpd);
2337 genpd_debug_remove(genpd);
2338 cancel_work_sync(&genpd->power_off_work);
2339 genpd_free_data(genpd);
2340
2341 pr_debug("%s: removed %s\n", __func__, dev_name(&genpd->dev));
2342
2343 return 0;
2344}
2345
2346/**
2347 * pm_genpd_remove - Remove a generic I/O PM domain
2348 * @genpd: Pointer to PM domain that is to be removed.
2349 *
2350 * To remove the PM domain, this function:
2351 * - Removes the PM domain as a subdomain to any parent domains,
2352 * if it was added.
2353 * - Removes the PM domain from the list of registered PM domains.
2354 *
2355 * The PM domain will only be removed, if the associated provider has
2356 * been removed, it is not a parent to any other PM domain and has no
2357 * devices associated with it.
2358 */
2359int pm_genpd_remove(struct generic_pm_domain *genpd)
2360{
2361 int ret;
2362
2363 mutex_lock(&gpd_list_lock);
2364 ret = genpd_remove(genpd);
2365 mutex_unlock(&gpd_list_lock);
2366
2367 return ret;
2368}
2369EXPORT_SYMBOL_GPL(pm_genpd_remove);
2370
2371#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
2372
2373/*
2374 * Device Tree based PM domain providers.
2375 *
2376 * The code below implements generic device tree based PM domain providers that
2377 * bind device tree nodes with generic PM domains registered in the system.
2378 *
2379 * Any driver that registers generic PM domains and needs to support binding of
2380 * devices to these domains is supposed to register a PM domain provider, which
2381 * maps a PM domain specifier retrieved from the device tree to a PM domain.
2382 *
2383 * Two simple mapping functions have been provided for convenience:
2384 * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping.
2385 * - genpd_xlate_onecell() for mapping of multiple PM domains per node by
2386 * index.
2387 */
2388
2389/**
2390 * struct of_genpd_provider - PM domain provider registration structure
2391 * @link: Entry in global list of PM domain providers
2392 * @node: Pointer to device tree node of PM domain provider
2393 * @xlate: Provider-specific xlate callback mapping a set of specifier cells
2394 * into a PM domain.
2395 * @data: context pointer to be passed into @xlate callback
2396 */
2397struct of_genpd_provider {
2398 struct list_head link;
2399 struct device_node *node;
2400 genpd_xlate_t xlate;
2401 void *data;
2402};
2403
2404/* List of registered PM domain providers. */
2405static LIST_HEAD(of_genpd_providers);
2406/* Mutex to protect the list above. */
2407static DEFINE_MUTEX(of_genpd_mutex);
2408
2409/**
2410 * genpd_xlate_simple() - Xlate function for direct node-domain mapping
2411 * @genpdspec: OF phandle args to map into a PM domain
2412 * @data: xlate function private data - pointer to struct generic_pm_domain
2413 *
2414 * This is a generic xlate function that can be used to model PM domains that
2415 * have their own device tree nodes. The private data of xlate function needs
2416 * to be a valid pointer to struct generic_pm_domain.
2417 */
2418static struct generic_pm_domain *genpd_xlate_simple(
2419 const struct of_phandle_args *genpdspec,
2420 void *data)
2421{
2422 return data;
2423}
2424
2425/**
2426 * genpd_xlate_onecell() - Xlate function using a single index.
2427 * @genpdspec: OF phandle args to map into a PM domain
2428 * @data: xlate function private data - pointer to struct genpd_onecell_data
2429 *
2430 * This is a generic xlate function that can be used to model simple PM domain
2431 * controllers that have one device tree node and provide multiple PM domains.
2432 * A single cell is used as an index into an array of PM domains specified in
2433 * the genpd_onecell_data struct when registering the provider.
2434 */
2435static struct generic_pm_domain *genpd_xlate_onecell(
2436 const struct of_phandle_args *genpdspec,
2437 void *data)
2438{
2439 struct genpd_onecell_data *genpd_data = data;
2440 unsigned int idx = genpdspec->args[0];
2441
2442 if (genpdspec->args_count != 1)
2443 return ERR_PTR(-EINVAL);
2444
2445 if (idx >= genpd_data->num_domains) {
2446 pr_err("%s: invalid domain index %u\n", __func__, idx);
2447 return ERR_PTR(-EINVAL);
2448 }
2449
2450 if (!genpd_data->domains[idx])
2451 return ERR_PTR(-ENOENT);
2452
2453 return genpd_data->domains[idx];
2454}
2455
2456/**
2457 * genpd_add_provider() - Register a PM domain provider for a node
2458 * @np: Device node pointer associated with the PM domain provider.
2459 * @xlate: Callback for decoding PM domain from phandle arguments.
2460 * @data: Context pointer for @xlate callback.
2461 */
2462static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
2463 void *data)
2464{
2465 struct of_genpd_provider *cp;
2466
2467 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
2468 if (!cp)
2469 return -ENOMEM;
2470
2471 cp->node = of_node_get(np);
2472 cp->data = data;
2473 cp->xlate = xlate;
2474 fwnode_dev_initialized(&np->fwnode, true);
2475
2476 mutex_lock(&of_genpd_mutex);
2477 list_add(&cp->link, &of_genpd_providers);
2478 mutex_unlock(&of_genpd_mutex);
2479 pr_debug("Added domain provider from %pOF\n", np);
2480
2481 return 0;
2482}
2483
2484static bool genpd_present(const struct generic_pm_domain *genpd)
2485{
2486 bool ret = false;
2487 const struct generic_pm_domain *gpd;
2488
2489 mutex_lock(&gpd_list_lock);
2490 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
2491 if (gpd == genpd) {
2492 ret = true;
2493 break;
2494 }
2495 }
2496 mutex_unlock(&gpd_list_lock);
2497
2498 return ret;
2499}
2500
2501/**
2502 * of_genpd_add_provider_simple() - Register a simple PM domain provider
2503 * @np: Device node pointer associated with the PM domain provider.
2504 * @genpd: Pointer to PM domain associated with the PM domain provider.
2505 */
2506int of_genpd_add_provider_simple(struct device_node *np,
2507 struct generic_pm_domain *genpd)
2508{
2509 int ret;
2510
2511 if (!np || !genpd)
2512 return -EINVAL;
2513
2514 if (!genpd_present(genpd))
2515 return -EINVAL;
2516
2517 genpd->dev.of_node = np;
2518
2519 /* Parse genpd OPP table */
2520 if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) {
2521 ret = dev_pm_opp_of_add_table(&genpd->dev);
2522 if (ret)
2523 return dev_err_probe(&genpd->dev, ret, "Failed to add OPP table\n");
2524
2525 /*
2526 * Save table for faster processing while setting performance
2527 * state.
2528 */
2529 genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev);
2530 WARN_ON(IS_ERR(genpd->opp_table));
2531 }
2532
2533 ret = genpd_add_provider(np, genpd_xlate_simple, genpd);
2534 if (ret) {
2535 if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) {
2536 dev_pm_opp_put_opp_table(genpd->opp_table);
2537 dev_pm_opp_of_remove_table(&genpd->dev);
2538 }
2539
2540 return ret;
2541 }
2542
2543 genpd->provider = &np->fwnode;
2544 genpd->has_provider = true;
2545
2546 return 0;
2547}
2548EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple);
2549
2550/**
2551 * of_genpd_add_provider_onecell() - Register a onecell PM domain provider
2552 * @np: Device node pointer associated with the PM domain provider.
2553 * @data: Pointer to the data associated with the PM domain provider.
2554 */
2555int of_genpd_add_provider_onecell(struct device_node *np,
2556 struct genpd_onecell_data *data)
2557{
2558 struct generic_pm_domain *genpd;
2559 unsigned int i;
2560 int ret = -EINVAL;
2561
2562 if (!np || !data)
2563 return -EINVAL;
2564
2565 if (!data->xlate)
2566 data->xlate = genpd_xlate_onecell;
2567
2568 for (i = 0; i < data->num_domains; i++) {
2569 genpd = data->domains[i];
2570
2571 if (!genpd)
2572 continue;
2573 if (!genpd_present(genpd))
2574 goto error;
2575
2576 genpd->dev.of_node = np;
2577
2578 /* Parse genpd OPP table */
2579 if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) {
2580 ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i);
2581 if (ret) {
2582 dev_err_probe(&genpd->dev, ret,
2583 "Failed to add OPP table for index %d\n", i);
2584 goto error;
2585 }
2586
2587 /*
2588 * Save table for faster processing while setting
2589 * performance state.
2590 */
2591 genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev);
2592 WARN_ON(IS_ERR(genpd->opp_table));
2593 }
2594
2595 genpd->provider = &np->fwnode;
2596 genpd->has_provider = true;
2597 }
2598
2599 ret = genpd_add_provider(np, data->xlate, data);
2600 if (ret < 0)
2601 goto error;
2602
2603 return 0;
2604
2605error:
2606 while (i--) {
2607 genpd = data->domains[i];
2608
2609 if (!genpd)
2610 continue;
2611
2612 genpd->provider = NULL;
2613 genpd->has_provider = false;
2614
2615 if (!genpd_is_opp_table_fw(genpd) && genpd->set_performance_state) {
2616 dev_pm_opp_put_opp_table(genpd->opp_table);
2617 dev_pm_opp_of_remove_table(&genpd->dev);
2618 }
2619 }
2620
2621 return ret;
2622}
2623EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell);
2624
2625/**
2626 * of_genpd_del_provider() - Remove a previously registered PM domain provider
2627 * @np: Device node pointer associated with the PM domain provider
2628 */
2629void of_genpd_del_provider(struct device_node *np)
2630{
2631 struct of_genpd_provider *cp, *tmp;
2632 struct generic_pm_domain *gpd;
2633
2634 mutex_lock(&gpd_list_lock);
2635 mutex_lock(&of_genpd_mutex);
2636 list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) {
2637 if (cp->node == np) {
2638 /*
2639 * For each PM domain associated with the
2640 * provider, set the 'has_provider' to false
2641 * so that the PM domain can be safely removed.
2642 */
2643 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
2644 if (gpd->provider == &np->fwnode) {
2645 gpd->has_provider = false;
2646
2647 if (genpd_is_opp_table_fw(gpd) || !gpd->set_performance_state)
2648 continue;
2649
2650 dev_pm_opp_put_opp_table(gpd->opp_table);
2651 dev_pm_opp_of_remove_table(&gpd->dev);
2652 }
2653 }
2654
2655 fwnode_dev_initialized(&cp->node->fwnode, false);
2656 list_del(&cp->link);
2657 of_node_put(cp->node);
2658 kfree(cp);
2659 break;
2660 }
2661 }
2662 mutex_unlock(&of_genpd_mutex);
2663 mutex_unlock(&gpd_list_lock);
2664}
2665EXPORT_SYMBOL_GPL(of_genpd_del_provider);
2666
2667/**
2668 * genpd_get_from_provider() - Look-up PM domain
2669 * @genpdspec: OF phandle args to use for look-up
2670 *
2671 * Looks for a PM domain provider under the node specified by @genpdspec and if
2672 * found, uses xlate function of the provider to map phandle args to a PM
2673 * domain.
2674 *
2675 * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
2676 * on failure.
2677 */
2678static struct generic_pm_domain *genpd_get_from_provider(
2679 const struct of_phandle_args *genpdspec)
2680{
2681 struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
2682 struct of_genpd_provider *provider;
2683
2684 if (!genpdspec)
2685 return ERR_PTR(-EINVAL);
2686
2687 mutex_lock(&of_genpd_mutex);
2688
2689 /* Check if we have such a provider in our array */
2690 list_for_each_entry(provider, &of_genpd_providers, link) {
2691 if (provider->node == genpdspec->np)
2692 genpd = provider->xlate(genpdspec, provider->data);
2693 if (!IS_ERR(genpd))
2694 break;
2695 }
2696
2697 mutex_unlock(&of_genpd_mutex);
2698
2699 return genpd;
2700}
2701
2702/**
2703 * of_genpd_add_device() - Add a device to an I/O PM domain
2704 * @genpdspec: OF phandle args to use for look-up PM domain
2705 * @dev: Device to be added.
2706 *
2707 * Looks-up an I/O PM domain based upon phandle args provided and adds
2708 * the device to the PM domain. Returns a negative error code on failure.
2709 */
2710int of_genpd_add_device(const struct of_phandle_args *genpdspec, struct device *dev)
2711{
2712 struct generic_pm_domain *genpd;
2713 int ret;
2714
2715 if (!dev)
2716 return -EINVAL;
2717
2718 mutex_lock(&gpd_list_lock);
2719
2720 genpd = genpd_get_from_provider(genpdspec);
2721 if (IS_ERR(genpd)) {
2722 ret = PTR_ERR(genpd);
2723 goto out;
2724 }
2725
2726 ret = genpd_add_device(genpd, dev, dev);
2727
2728out:
2729 mutex_unlock(&gpd_list_lock);
2730
2731 return ret;
2732}
2733EXPORT_SYMBOL_GPL(of_genpd_add_device);
2734
2735/**
2736 * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
2737 * @parent_spec: OF phandle args to use for parent PM domain look-up
2738 * @subdomain_spec: OF phandle args to use for subdomain look-up
2739 *
2740 * Looks-up a parent PM domain and subdomain based upon phandle args
2741 * provided and adds the subdomain to the parent PM domain. Returns a
2742 * negative error code on failure.
2743 */
2744int of_genpd_add_subdomain(const struct of_phandle_args *parent_spec,
2745 const struct of_phandle_args *subdomain_spec)
2746{
2747 struct generic_pm_domain *parent, *subdomain;
2748 int ret;
2749
2750 mutex_lock(&gpd_list_lock);
2751
2752 parent = genpd_get_from_provider(parent_spec);
2753 if (IS_ERR(parent)) {
2754 ret = PTR_ERR(parent);
2755 goto out;
2756 }
2757
2758 subdomain = genpd_get_from_provider(subdomain_spec);
2759 if (IS_ERR(subdomain)) {
2760 ret = PTR_ERR(subdomain);
2761 goto out;
2762 }
2763
2764 ret = genpd_add_subdomain(parent, subdomain);
2765
2766out:
2767 mutex_unlock(&gpd_list_lock);
2768
2769 return ret == -ENOENT ? -EPROBE_DEFER : ret;
2770}
2771EXPORT_SYMBOL_GPL(of_genpd_add_subdomain);
2772
2773/**
2774 * of_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
2775 * @parent_spec: OF phandle args to use for parent PM domain look-up
2776 * @subdomain_spec: OF phandle args to use for subdomain look-up
2777 *
2778 * Looks-up a parent PM domain and subdomain based upon phandle args
2779 * provided and removes the subdomain from the parent PM domain. Returns a
2780 * negative error code on failure.
2781 */
2782int of_genpd_remove_subdomain(const struct of_phandle_args *parent_spec,
2783 const struct of_phandle_args *subdomain_spec)
2784{
2785 struct generic_pm_domain *parent, *subdomain;
2786 int ret;
2787
2788 mutex_lock(&gpd_list_lock);
2789
2790 parent = genpd_get_from_provider(parent_spec);
2791 if (IS_ERR(parent)) {
2792 ret = PTR_ERR(parent);
2793 goto out;
2794 }
2795
2796 subdomain = genpd_get_from_provider(subdomain_spec);
2797 if (IS_ERR(subdomain)) {
2798 ret = PTR_ERR(subdomain);
2799 goto out;
2800 }
2801
2802 ret = pm_genpd_remove_subdomain(parent, subdomain);
2803
2804out:
2805 mutex_unlock(&gpd_list_lock);
2806
2807 return ret;
2808}
2809EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain);
2810
2811/**
2812 * of_genpd_remove_last - Remove the last PM domain registered for a provider
2813 * @np: Pointer to device node associated with provider
2814 *
2815 * Find the last PM domain that was added by a particular provider and
2816 * remove this PM domain from the list of PM domains. The provider is
2817 * identified by the 'provider' device structure that is passed. The PM
2818 * domain will only be removed, if the provider associated with domain
2819 * has been removed.
2820 *
2821 * Returns a valid pointer to struct generic_pm_domain on success or
2822 * ERR_PTR() on failure.
2823 */
2824struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
2825{
2826 struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT);
2827 int ret;
2828
2829 if (IS_ERR_OR_NULL(np))
2830 return ERR_PTR(-EINVAL);
2831
2832 mutex_lock(&gpd_list_lock);
2833 list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) {
2834 if (gpd->provider == &np->fwnode) {
2835 ret = genpd_remove(gpd);
2836 genpd = ret ? ERR_PTR(ret) : gpd;
2837 break;
2838 }
2839 }
2840 mutex_unlock(&gpd_list_lock);
2841
2842 return genpd;
2843}
2844EXPORT_SYMBOL_GPL(of_genpd_remove_last);
2845
2846static void genpd_release_dev(struct device *dev)
2847{
2848 of_node_put(dev->of_node);
2849 kfree(dev);
2850}
2851
2852static const struct bus_type genpd_bus_type = {
2853 .name = "genpd",
2854};
2855
2856/**
2857 * genpd_dev_pm_detach - Detach a device from its PM domain.
2858 * @dev: Device to detach.
2859 * @power_off: Currently not used
2860 *
2861 * Try to locate a corresponding generic PM domain, which the device was
2862 * attached to previously. If such is found, the device is detached from it.
2863 */
2864static void genpd_dev_pm_detach(struct device *dev, bool power_off)
2865{
2866 struct generic_pm_domain *pd;
2867 unsigned int i;
2868 int ret = 0;
2869
2870 pd = dev_to_genpd(dev);
2871 if (IS_ERR(pd))
2872 return;
2873
2874 dev_dbg(dev, "removing from PM domain %s\n", pd->name);
2875
2876 /* Drop the default performance state */
2877 if (dev_gpd_data(dev)->default_pstate) {
2878 dev_pm_genpd_set_performance_state(dev, 0);
2879 dev_gpd_data(dev)->default_pstate = 0;
2880 }
2881
2882 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
2883 ret = genpd_remove_device(pd, dev);
2884 if (ret != -EAGAIN)
2885 break;
2886
2887 mdelay(i);
2888 cond_resched();
2889 }
2890
2891 if (ret < 0) {
2892 dev_err(dev, "failed to remove from PM domain %s: %d",
2893 pd->name, ret);
2894 return;
2895 }
2896
2897 /* Check if PM domain can be powered off after removing this device. */
2898 genpd_queue_power_off_work(pd);
2899
2900 /* Unregister the device if it was created by genpd. */
2901 if (dev->bus == &genpd_bus_type)
2902 device_unregister(dev);
2903}
2904
2905static void genpd_dev_pm_sync(struct device *dev)
2906{
2907 struct generic_pm_domain *pd;
2908
2909 pd = dev_to_genpd(dev);
2910 if (IS_ERR(pd))
2911 return;
2912
2913 genpd_queue_power_off_work(pd);
2914}
2915
2916static int genpd_set_required_opp_dev(struct device *dev,
2917 struct device *base_dev)
2918{
2919 struct dev_pm_opp_config config = {
2920 .required_dev = dev,
2921 };
2922 int ret;
2923
2924 /* Limit support to non-providers for now. */
2925 if (of_property_present(base_dev->of_node, "#power-domain-cells"))
2926 return 0;
2927
2928 if (!dev_pm_opp_of_has_required_opp(base_dev))
2929 return 0;
2930
2931 ret = dev_pm_opp_set_config(base_dev, &config);
2932 if (ret < 0)
2933 return ret;
2934
2935 dev_gpd_data(dev)->opp_token = ret;
2936 return 0;
2937}
2938
2939static int genpd_set_required_opp(struct device *dev, unsigned int index)
2940{
2941 int ret, pstate;
2942
2943 /* Set the default performance state */
2944 pstate = of_get_required_opp_performance_state(dev->of_node, index);
2945 if (pstate < 0 && pstate != -ENODEV && pstate != -EOPNOTSUPP) {
2946 ret = pstate;
2947 goto err;
2948 } else if (pstate > 0) {
2949 ret = dev_pm_genpd_set_performance_state(dev, pstate);
2950 if (ret)
2951 goto err;
2952 dev_gpd_data(dev)->default_pstate = pstate;
2953 }
2954
2955 return 0;
2956err:
2957 dev_err(dev, "failed to set required performance state for power-domain %s: %d\n",
2958 dev_to_genpd(dev)->name, ret);
2959 return ret;
2960}
2961
2962static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
2963 unsigned int index, unsigned int num_domains,
2964 bool power_on)
2965{
2966 struct of_phandle_args pd_args;
2967 struct generic_pm_domain *pd;
2968 int ret;
2969
2970 ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
2971 "#power-domain-cells", index, &pd_args);
2972 if (ret < 0)
2973 return ret;
2974
2975 mutex_lock(&gpd_list_lock);
2976 pd = genpd_get_from_provider(&pd_args);
2977 of_node_put(pd_args.np);
2978 if (IS_ERR(pd)) {
2979 mutex_unlock(&gpd_list_lock);
2980 dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
2981 __func__, PTR_ERR(pd));
2982 return driver_deferred_probe_check_state(base_dev);
2983 }
2984
2985 dev_dbg(dev, "adding to PM domain %s\n", pd->name);
2986
2987 ret = genpd_add_device(pd, dev, base_dev);
2988 mutex_unlock(&gpd_list_lock);
2989
2990 if (ret < 0)
2991 return dev_err_probe(dev, ret, "failed to add to PM domain %s\n", pd->name);
2992
2993 dev->pm_domain->detach = genpd_dev_pm_detach;
2994 dev->pm_domain->sync = genpd_dev_pm_sync;
2995
2996 /*
2997 * For a single PM domain the index of the required OPP must be zero, so
2998 * let's try to assign a required dev in that case. In the multiple PM
2999 * domains case, we need platform code to specify the index.
3000 */
3001 if (num_domains == 1) {
3002 ret = genpd_set_required_opp_dev(dev, base_dev);
3003 if (ret)
3004 goto err;
3005 }
3006
3007 ret = genpd_set_required_opp(dev, index);
3008 if (ret)
3009 goto err;
3010
3011 if (power_on) {
3012 genpd_lock(pd);
3013 ret = genpd_power_on(pd, 0);
3014 genpd_unlock(pd);
3015 }
3016
3017 if (ret) {
3018 /* Drop the default performance state */
3019 if (dev_gpd_data(dev)->default_pstate) {
3020 dev_pm_genpd_set_performance_state(dev, 0);
3021 dev_gpd_data(dev)->default_pstate = 0;
3022 }
3023
3024 genpd_remove_device(pd, dev);
3025 return -EPROBE_DEFER;
3026 }
3027
3028 return 1;
3029
3030err:
3031 genpd_remove_device(pd, dev);
3032 return ret;
3033}
3034
3035/**
3036 * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
3037 * @dev: Device to attach.
3038 *
3039 * Parse device's OF node to find a PM domain specifier. If such is found,
3040 * attaches the device to retrieved pm_domain ops.
3041 *
3042 * Returns 1 on successfully attached PM domain, 0 when the device don't need a
3043 * PM domain or when multiple power-domains exists for it, else a negative error
3044 * code. Note that if a power-domain exists for the device, but it cannot be
3045 * found or turned on, then return -EPROBE_DEFER to ensure that the device is
3046 * not probed and to re-try again later.
3047 */
3048int genpd_dev_pm_attach(struct device *dev)
3049{
3050 if (!dev->of_node)
3051 return 0;
3052
3053 /*
3054 * Devices with multiple PM domains must be attached separately, as we
3055 * can only attach one PM domain per device.
3056 */
3057 if (of_count_phandle_with_args(dev->of_node, "power-domains",
3058 "#power-domain-cells") != 1)
3059 return 0;
3060
3061 return __genpd_dev_pm_attach(dev, dev, 0, 1, true);
3062}
3063EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
3064
3065/**
3066 * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains.
3067 * @dev: The device used to lookup the PM domain.
3068 * @index: The index of the PM domain.
3069 *
3070 * Parse device's OF node to find a PM domain specifier at the provided @index.
3071 * If such is found, creates a virtual device and attaches it to the retrieved
3072 * pm_domain ops. To deal with detaching of the virtual device, the ->detach()
3073 * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach().
3074 *
3075 * Returns the created virtual device if successfully attached PM domain, NULL
3076 * when the device don't need a PM domain, else an ERR_PTR() in case of
3077 * failures. If a power-domain exists for the device, but cannot be found or
3078 * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device
3079 * is not probed and to re-try again later.
3080 */
3081struct device *genpd_dev_pm_attach_by_id(struct device *dev,
3082 unsigned int index)
3083{
3084 struct device *virt_dev;
3085 int num_domains;
3086 int ret;
3087
3088 if (!dev->of_node)
3089 return NULL;
3090
3091 /* Verify that the index is within a valid range. */
3092 num_domains = of_count_phandle_with_args(dev->of_node, "power-domains",
3093 "#power-domain-cells");
3094 if (index >= num_domains)
3095 return NULL;
3096
3097 /* Allocate and register device on the genpd bus. */
3098 virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL);
3099 if (!virt_dev)
3100 return ERR_PTR(-ENOMEM);
3101
3102 dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev));
3103 virt_dev->bus = &genpd_bus_type;
3104 virt_dev->release = genpd_release_dev;
3105 virt_dev->of_node = of_node_get(dev->of_node);
3106
3107 ret = device_register(virt_dev);
3108 if (ret) {
3109 put_device(virt_dev);
3110 return ERR_PTR(ret);
3111 }
3112
3113 /* Try to attach the device to the PM domain at the specified index. */
3114 ret = __genpd_dev_pm_attach(virt_dev, dev, index, num_domains, false);
3115 if (ret < 1) {
3116 device_unregister(virt_dev);
3117 return ret ? ERR_PTR(ret) : NULL;
3118 }
3119
3120 pm_runtime_enable(virt_dev);
3121 genpd_queue_power_off_work(dev_to_genpd(virt_dev));
3122
3123 return virt_dev;
3124}
3125EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id);
3126
3127/**
3128 * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains.
3129 * @dev: The device used to lookup the PM domain.
3130 * @name: The name of the PM domain.
3131 *
3132 * Parse device's OF node to find a PM domain specifier using the
3133 * power-domain-names DT property. For further description see
3134 * genpd_dev_pm_attach_by_id().
3135 */
3136struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name)
3137{
3138 int index;
3139
3140 if (!dev->of_node)
3141 return NULL;
3142
3143 index = of_property_match_string(dev->of_node, "power-domain-names",
3144 name);
3145 if (index < 0)
3146 return NULL;
3147
3148 return genpd_dev_pm_attach_by_id(dev, index);
3149}
3150
3151static const struct of_device_id idle_state_match[] = {
3152 { .compatible = "domain-idle-state", },
3153 { }
3154};
3155
3156static int genpd_parse_state(struct genpd_power_state *genpd_state,
3157 struct device_node *state_node)
3158{
3159 int err;
3160 u32 residency;
3161 u32 entry_latency, exit_latency;
3162
3163 err = of_property_read_u32(state_node, "entry-latency-us",
3164 &entry_latency);
3165 if (err) {
3166 pr_debug(" * %pOF missing entry-latency-us property\n",
3167 state_node);
3168 return -EINVAL;
3169 }
3170
3171 err = of_property_read_u32(state_node, "exit-latency-us",
3172 &exit_latency);
3173 if (err) {
3174 pr_debug(" * %pOF missing exit-latency-us property\n",
3175 state_node);
3176 return -EINVAL;
3177 }
3178
3179 err = of_property_read_u32(state_node, "min-residency-us", &residency);
3180 if (!err)
3181 genpd_state->residency_ns = 1000LL * residency;
3182
3183 genpd_state->power_on_latency_ns = 1000LL * exit_latency;
3184 genpd_state->power_off_latency_ns = 1000LL * entry_latency;
3185 genpd_state->fwnode = &state_node->fwnode;
3186
3187 return 0;
3188}
3189
3190static int genpd_iterate_idle_states(struct device_node *dn,
3191 struct genpd_power_state *states)
3192{
3193 int ret;
3194 struct of_phandle_iterator it;
3195 struct device_node *np;
3196 int i = 0;
3197
3198 ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL);
3199 if (ret <= 0)
3200 return ret == -ENOENT ? 0 : ret;
3201
3202 /* Loop over the phandles until all the requested entry is found */
3203 of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) {
3204 np = it.node;
3205 if (!of_match_node(idle_state_match, np))
3206 continue;
3207
3208 if (!of_device_is_available(np))
3209 continue;
3210
3211 if (states) {
3212 ret = genpd_parse_state(&states[i], np);
3213 if (ret) {
3214 pr_err("Parsing idle state node %pOF failed with err %d\n",
3215 np, ret);
3216 of_node_put(np);
3217 return ret;
3218 }
3219 }
3220 i++;
3221 }
3222
3223 return i;
3224}
3225
3226/**
3227 * of_genpd_parse_idle_states: Return array of idle states for the genpd.
3228 *
3229 * @dn: The genpd device node
3230 * @states: The pointer to which the state array will be saved.
3231 * @n: The count of elements in the array returned from this function.
3232 *
3233 * Returns the device states parsed from the OF node. The memory for the states
3234 * is allocated by this function and is the responsibility of the caller to
3235 * free the memory after use. If any or zero compatible domain idle states is
3236 * found it returns 0 and in case of errors, a negative error code is returned.
3237 */
3238int of_genpd_parse_idle_states(struct device_node *dn,
3239 struct genpd_power_state **states, int *n)
3240{
3241 struct genpd_power_state *st;
3242 int ret;
3243
3244 ret = genpd_iterate_idle_states(dn, NULL);
3245 if (ret < 0)
3246 return ret;
3247
3248 if (!ret) {
3249 *states = NULL;
3250 *n = 0;
3251 return 0;
3252 }
3253
3254 st = kcalloc(ret, sizeof(*st), GFP_KERNEL);
3255 if (!st)
3256 return -ENOMEM;
3257
3258 ret = genpd_iterate_idle_states(dn, st);
3259 if (ret <= 0) {
3260 kfree(st);
3261 return ret < 0 ? ret : -EINVAL;
3262 }
3263
3264 *states = st;
3265 *n = ret;
3266
3267 return 0;
3268}
3269EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states);
3270
3271static int __init genpd_bus_init(void)
3272{
3273 return bus_register(&genpd_bus_type);
3274}
3275core_initcall(genpd_bus_init);
3276
3277#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
3278
3279
3280/*** debugfs support ***/
3281
3282#ifdef CONFIG_DEBUG_FS
3283/*
3284 * TODO: This function is a slightly modified version of rtpm_status_show
3285 * from sysfs.c, so generalize it.
3286 */
3287static void rtpm_status_str(struct seq_file *s, struct device *dev)
3288{
3289 static const char * const status_lookup[] = {
3290 [RPM_ACTIVE] = "active",
3291 [RPM_RESUMING] = "resuming",
3292 [RPM_SUSPENDED] = "suspended",
3293 [RPM_SUSPENDING] = "suspending"
3294 };
3295 const char *p = "";
3296
3297 if (dev->power.runtime_error)
3298 p = "error";
3299 else if (dev->power.disable_depth)
3300 p = "unsupported";
3301 else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup))
3302 p = status_lookup[dev->power.runtime_status];
3303 else
3304 WARN_ON(1);
3305
3306 seq_printf(s, "%-26s ", p);
3307}
3308
3309static void perf_status_str(struct seq_file *s, struct device *dev)
3310{
3311 struct generic_pm_domain_data *gpd_data;
3312
3313 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
3314
3315 seq_printf(s, "%-10u ", gpd_data->performance_state);
3316}
3317
3318static void mode_status_str(struct seq_file *s, struct device *dev)
3319{
3320 struct generic_pm_domain_data *gpd_data;
3321
3322 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
3323
3324 seq_printf(s, "%2s", gpd_data->hw_mode ? "HW" : "SW");
3325}
3326
3327static int genpd_summary_one(struct seq_file *s,
3328 struct generic_pm_domain *genpd)
3329{
3330 static const char * const status_lookup[] = {
3331 [GENPD_STATE_ON] = "on",
3332 [GENPD_STATE_OFF] = "off"
3333 };
3334 struct pm_domain_data *pm_data;
3335 struct gpd_link *link;
3336 char state[16];
3337 int ret;
3338
3339 ret = genpd_lock_interruptible(genpd);
3340 if (ret)
3341 return -ERESTARTSYS;
3342
3343 if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup)))
3344 goto exit;
3345 if (!genpd_status_on(genpd))
3346 snprintf(state, sizeof(state), "%s-%u",
3347 status_lookup[genpd->status], genpd->state_idx);
3348 else
3349 snprintf(state, sizeof(state), "%s",
3350 status_lookup[genpd->status]);
3351 seq_printf(s, "%-30s %-30s %u", dev_name(&genpd->dev), state, genpd->performance_state);
3352
3353 /*
3354 * Modifications on the list require holding locks on both
3355 * parent and child, so we are safe.
3356 * Also the device name is immutable.
3357 */
3358 list_for_each_entry(link, &genpd->parent_links, parent_node) {
3359 if (list_is_first(&link->parent_node, &genpd->parent_links))
3360 seq_printf(s, "\n%48s", " ");
3361 seq_printf(s, "%s", link->child->name);
3362 if (!list_is_last(&link->parent_node, &genpd->parent_links))
3363 seq_puts(s, ", ");
3364 }
3365
3366 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
3367 seq_printf(s, "\n %-30s ", dev_name(pm_data->dev));
3368 rtpm_status_str(s, pm_data->dev);
3369 perf_status_str(s, pm_data->dev);
3370 mode_status_str(s, pm_data->dev);
3371 }
3372
3373 seq_puts(s, "\n");
3374exit:
3375 genpd_unlock(genpd);
3376
3377 return 0;
3378}
3379
3380static int summary_show(struct seq_file *s, void *data)
3381{
3382 struct generic_pm_domain *genpd;
3383 int ret = 0;
3384
3385 seq_puts(s, "domain status children performance\n");
3386 seq_puts(s, " /device runtime status managed by\n");
3387 seq_puts(s, "------------------------------------------------------------------------------\n");
3388
3389 ret = mutex_lock_interruptible(&gpd_list_lock);
3390 if (ret)
3391 return -ERESTARTSYS;
3392
3393 list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
3394 ret = genpd_summary_one(s, genpd);
3395 if (ret)
3396 break;
3397 }
3398 mutex_unlock(&gpd_list_lock);
3399
3400 return ret;
3401}
3402
3403static int status_show(struct seq_file *s, void *data)
3404{
3405 static const char * const status_lookup[] = {
3406 [GENPD_STATE_ON] = "on",
3407 [GENPD_STATE_OFF] = "off"
3408 };
3409
3410 struct generic_pm_domain *genpd = s->private;
3411 int ret = 0;
3412
3413 ret = genpd_lock_interruptible(genpd);
3414 if (ret)
3415 return -ERESTARTSYS;
3416
3417 if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup)))
3418 goto exit;
3419
3420 if (genpd->status == GENPD_STATE_OFF)
3421 seq_printf(s, "%s-%u\n", status_lookup[genpd->status],
3422 genpd->state_idx);
3423 else
3424 seq_printf(s, "%s\n", status_lookup[genpd->status]);
3425exit:
3426 genpd_unlock(genpd);
3427 return ret;
3428}
3429
3430static int sub_domains_show(struct seq_file *s, void *data)
3431{
3432 struct generic_pm_domain *genpd = s->private;
3433 struct gpd_link *link;
3434 int ret = 0;
3435
3436 ret = genpd_lock_interruptible(genpd);
3437 if (ret)
3438 return -ERESTARTSYS;
3439
3440 list_for_each_entry(link, &genpd->parent_links, parent_node)
3441 seq_printf(s, "%s\n", link->child->name);
3442
3443 genpd_unlock(genpd);
3444 return ret;
3445}
3446
3447static int idle_states_show(struct seq_file *s, void *data)
3448{
3449 struct generic_pm_domain *genpd = s->private;
3450 u64 now, delta, idle_time = 0;
3451 unsigned int i;
3452 int ret = 0;
3453
3454 ret = genpd_lock_interruptible(genpd);
3455 if (ret)
3456 return -ERESTARTSYS;
3457
3458 seq_puts(s, "State Time Spent(ms) Usage Rejected\n");
3459
3460 for (i = 0; i < genpd->state_count; i++) {
3461 idle_time += genpd->states[i].idle_time;
3462
3463 if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) {
3464 now = ktime_get_mono_fast_ns();
3465 if (now > genpd->accounting_time) {
3466 delta = now - genpd->accounting_time;
3467 idle_time += delta;
3468 }
3469 }
3470
3471 do_div(idle_time, NSEC_PER_MSEC);
3472 seq_printf(s, "S%-13i %-14llu %-14llu %llu\n", i, idle_time,
3473 genpd->states[i].usage, genpd->states[i].rejected);
3474 }
3475
3476 genpd_unlock(genpd);
3477 return ret;
3478}
3479
3480static int active_time_show(struct seq_file *s, void *data)
3481{
3482 struct generic_pm_domain *genpd = s->private;
3483 u64 now, on_time, delta = 0;
3484 int ret = 0;
3485
3486 ret = genpd_lock_interruptible(genpd);
3487 if (ret)
3488 return -ERESTARTSYS;
3489
3490 if (genpd->status == GENPD_STATE_ON) {
3491 now = ktime_get_mono_fast_ns();
3492 if (now > genpd->accounting_time)
3493 delta = now - genpd->accounting_time;
3494 }
3495
3496 on_time = genpd->on_time + delta;
3497 do_div(on_time, NSEC_PER_MSEC);
3498 seq_printf(s, "%llu ms\n", on_time);
3499
3500 genpd_unlock(genpd);
3501 return ret;
3502}
3503
3504static int total_idle_time_show(struct seq_file *s, void *data)
3505{
3506 struct generic_pm_domain *genpd = s->private;
3507 u64 now, delta, total = 0;
3508 unsigned int i;
3509 int ret = 0;
3510
3511 ret = genpd_lock_interruptible(genpd);
3512 if (ret)
3513 return -ERESTARTSYS;
3514
3515 for (i = 0; i < genpd->state_count; i++) {
3516 total += genpd->states[i].idle_time;
3517
3518 if (genpd->status == GENPD_STATE_OFF && genpd->state_idx == i) {
3519 now = ktime_get_mono_fast_ns();
3520 if (now > genpd->accounting_time) {
3521 delta = now - genpd->accounting_time;
3522 total += delta;
3523 }
3524 }
3525 }
3526
3527 do_div(total, NSEC_PER_MSEC);
3528 seq_printf(s, "%llu ms\n", total);
3529
3530 genpd_unlock(genpd);
3531 return ret;
3532}
3533
3534
3535static int devices_show(struct seq_file *s, void *data)
3536{
3537 struct generic_pm_domain *genpd = s->private;
3538 struct pm_domain_data *pm_data;
3539 int ret = 0;
3540
3541 ret = genpd_lock_interruptible(genpd);
3542 if (ret)
3543 return -ERESTARTSYS;
3544
3545 list_for_each_entry(pm_data, &genpd->dev_list, list_node)
3546 seq_printf(s, "%s\n", dev_name(pm_data->dev));
3547
3548 genpd_unlock(genpd);
3549 return ret;
3550}
3551
3552static int perf_state_show(struct seq_file *s, void *data)
3553{
3554 struct generic_pm_domain *genpd = s->private;
3555
3556 if (genpd_lock_interruptible(genpd))
3557 return -ERESTARTSYS;
3558
3559 seq_printf(s, "%u\n", genpd->performance_state);
3560
3561 genpd_unlock(genpd);
3562 return 0;
3563}
3564
3565DEFINE_SHOW_ATTRIBUTE(summary);
3566DEFINE_SHOW_ATTRIBUTE(status);
3567DEFINE_SHOW_ATTRIBUTE(sub_domains);
3568DEFINE_SHOW_ATTRIBUTE(idle_states);
3569DEFINE_SHOW_ATTRIBUTE(active_time);
3570DEFINE_SHOW_ATTRIBUTE(total_idle_time);
3571DEFINE_SHOW_ATTRIBUTE(devices);
3572DEFINE_SHOW_ATTRIBUTE(perf_state);
3573
3574static void genpd_debug_add(struct generic_pm_domain *genpd)
3575{
3576 struct dentry *d;
3577
3578 if (!genpd_debugfs_dir)
3579 return;
3580
3581 d = debugfs_create_dir(dev_name(&genpd->dev), genpd_debugfs_dir);
3582
3583 debugfs_create_file("current_state", 0444,
3584 d, genpd, &status_fops);
3585 debugfs_create_file("sub_domains", 0444,
3586 d, genpd, &sub_domains_fops);
3587 debugfs_create_file("idle_states", 0444,
3588 d, genpd, &idle_states_fops);
3589 debugfs_create_file("active_time", 0444,
3590 d, genpd, &active_time_fops);
3591 debugfs_create_file("total_idle_time", 0444,
3592 d, genpd, &total_idle_time_fops);
3593 debugfs_create_file("devices", 0444,
3594 d, genpd, &devices_fops);
3595 if (genpd->set_performance_state)
3596 debugfs_create_file("perf_state", 0444,
3597 d, genpd, &perf_state_fops);
3598}
3599
3600static int __init genpd_debug_init(void)
3601{
3602 struct generic_pm_domain *genpd;
3603
3604 genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL);
3605
3606 debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir,
3607 NULL, &summary_fops);
3608
3609 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
3610 genpd_debug_add(genpd);
3611
3612 return 0;
3613}
3614late_initcall(genpd_debug_init);
3615
3616static void __exit genpd_debug_exit(void)
3617{
3618 debugfs_remove_recursive(genpd_debugfs_dir);
3619}
3620__exitcall(genpd_debug_exit);
3621#endif /* CONFIG_DEBUG_FS */