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Linux 5.6-rc5
[linux-2.6-block.git] / drivers / base / power / domain.c
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5de363b6 1// SPDX-License-Identifier: GPL-2.0
f721889f
RW		 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.
f721889f 6 */
7a5bd127
JP		 7#define pr_fmt(fmt) "PM: " fmt
8
93af5e93 9#include <linux/delay.h>
f721889f
RW		 10#include <linux/kernel.h>
11#include <linux/io.h>
aa42240a 12#include <linux/platform_device.h>
6a0ae73d 13#include <linux/pm_opp.h>
f721889f
RW		 14#include <linux/pm_runtime.h>
15#include <linux/pm_domain.h>
6ff7bb0d 16#include <linux/pm_qos.h>
c11f6f5b 17#include <linux/pm_clock.h>
f721889f
RW		 18#include <linux/slab.h>
19#include <linux/err.h>
17b75eca
RW		 20#include <linux/sched.h>
21#include <linux/suspend.h>
d5e4cbfe 22#include <linux/export.h>
eb594b73 23#include <linux/cpu.h>
d5e4cbfe 24
aa8e54b5
TV		 25#include "power.h"
26
93af5e93
GU		 27#define GENPD_RETRY_MAX_MS 250 /* Approximate */
28
d5e4cbfe
RW		 29#define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \
30({ \
31 type (*__routine)(struct device *__d); \
32 type __ret = (type)0; \
33 \
34 __routine = genpd->dev_ops.callback; \
35 if (__routine) { \
36 __ret = __routine(dev); \
d5e4cbfe
RW		 37 } \
38 __ret; \
39})
f721889f 40
5125bbf3
RW		 41static LIST_HEAD(gpd_list);
42static DEFINE_MUTEX(gpd_list_lock);
43
35241d12
LI		 44struct genpd_lock_ops {
45 void (*lock)(struct generic_pm_domain *genpd);
46 void (*lock_nested)(struct generic_pm_domain *genpd, int depth);
47 int (*lock_interruptible)(struct generic_pm_domain *genpd);
48 void (*unlock)(struct generic_pm_domain *genpd);
49};
50
51static void genpd_lock_mtx(struct generic_pm_domain *genpd)
52{
53 mutex_lock(&genpd->mlock);
54}
55
56static void genpd_lock_nested_mtx(struct generic_pm_domain *genpd,
57 int depth)
58{
59 mutex_lock_nested(&genpd->mlock, depth);
60}
61
62static int genpd_lock_interruptible_mtx(struct generic_pm_domain *genpd)
63{
64 return mutex_lock_interruptible(&genpd->mlock);
65}
66
67static void genpd_unlock_mtx(struct generic_pm_domain *genpd)
68{
69 return mutex_unlock(&genpd->mlock);
70}
71
72static const struct genpd_lock_ops genpd_mtx_ops = {
73 .lock = genpd_lock_mtx,
74 .lock_nested = genpd_lock_nested_mtx,
75 .lock_interruptible = genpd_lock_interruptible_mtx,
76 .unlock = genpd_unlock_mtx,
77};
78
d716f479
LI		 79static void genpd_lock_spin(struct generic_pm_domain *genpd)
80 __acquires(&genpd->slock)
81{
82 unsigned long flags;
83
84 spin_lock_irqsave(&genpd->slock, flags);
85 genpd->lock_flags = flags;
86}
87
88static void genpd_lock_nested_spin(struct generic_pm_domain *genpd,
89 int depth)
90 __acquires(&genpd->slock)
91{
92 unsigned long flags;
93
94 spin_lock_irqsave_nested(&genpd->slock, flags, depth);
95 genpd->lock_flags = flags;
96}
97
98static int genpd_lock_interruptible_spin(struct generic_pm_domain *genpd)
99 __acquires(&genpd->slock)
100{
101 unsigned long flags;
102
103 spin_lock_irqsave(&genpd->slock, flags);
104 genpd->lock_flags = flags;
105 return 0;
106}
107
108static void genpd_unlock_spin(struct generic_pm_domain *genpd)
109 __releases(&genpd->slock)
110{
111 spin_unlock_irqrestore(&genpd->slock, genpd->lock_flags);
112}
113
114static const struct genpd_lock_ops genpd_spin_ops = {
115 .lock = genpd_lock_spin,
116 .lock_nested = genpd_lock_nested_spin,
117 .lock_interruptible = genpd_lock_interruptible_spin,
118 .unlock = genpd_unlock_spin,
119};
120
35241d12
LI		 121#define genpd_lock(p) p->lock_ops->lock(p)
122#define genpd_lock_nested(p, d) p->lock_ops->lock_nested(p, d)
123#define genpd_lock_interruptible(p) p->lock_ops->lock_interruptible(p)
124#define genpd_unlock(p) p->lock_ops->unlock(p)
125
41e2c8e0 126#define genpd_status_on(genpd) (genpd->status == GPD_STATE_ACTIVE)
d716f479 127#define genpd_is_irq_safe(genpd) (genpd->flags & GENPD_FLAG_IRQ_SAFE)
ffaa42e8 128#define genpd_is_always_on(genpd) (genpd->flags & GENPD_FLAG_ALWAYS_ON)
95a20ef6 129#define genpd_is_active_wakeup(genpd) (genpd->flags & GENPD_FLAG_ACTIVE_WAKEUP)
eb594b73 130#define genpd_is_cpu_domain(genpd) (genpd->flags & GENPD_FLAG_CPU_DOMAIN)
ed61e18a 131#define genpd_is_rpm_always_on(genpd) (genpd->flags & GENPD_FLAG_RPM_ALWAYS_ON)
d716f479
LI		 132
133static inline bool irq_safe_dev_in_no_sleep_domain(struct device *dev,
d8600c8b 134 const struct generic_pm_domain *genpd)
d716f479
LI		 135{
136 bool ret;
137
138 ret = pm_runtime_is_irq_safe(dev) && !genpd_is_irq_safe(genpd);
139
075c37d5
UH		 140 /*
141 * Warn once if an IRQ safe device is attached to a no sleep domain, as
142 * to indicate a suboptimal configuration for PM. For an always on
143 * domain this isn't case, thus don't warn.
144 */
145 if (ret && !genpd_is_always_on(genpd))
d716f479
LI		 146 dev_warn_once(dev, "PM domain %s will not be powered off\n",
147 genpd->name);
148
149 return ret;
150}
151
b3ad17c0
UH		 152static int genpd_runtime_suspend(struct device *dev);
153
446d999c
RK		 154/*
155 * Get the generic PM domain for a particular struct device.
156 * This validates the struct device pointer, the PM domain pointer,
157 * and checks that the PM domain pointer is a real generic PM domain.
158 * Any failure results in NULL being returned.
159 */
b3ad17c0 160static struct generic_pm_domain *dev_to_genpd_safe(struct device *dev)
446d999c 161{
446d999c
RK		 162 if (IS_ERR_OR_NULL(dev) || IS_ERR_OR_NULL(dev->pm_domain))
163 return NULL;
164
b3ad17c0
UH		 165 /* A genpd's always have its ->runtime_suspend() callback assigned. */
166 if (dev->pm_domain->ops.runtime_suspend == genpd_runtime_suspend)
167 return pd_to_genpd(dev->pm_domain);
446d999c 168
b3ad17c0 169 return NULL;
446d999c
RK		 170}
171
172/*
173 * This should only be used where we are certain that the pm_domain
174 * attached to the device is a genpd domain.
175 */
176static struct generic_pm_domain *dev_to_genpd(struct device *dev)
5248051b
RW		 177{
178 if (IS_ERR_OR_NULL(dev->pm_domain))
179 return ERR_PTR(-EINVAL);
180
596ba34b 181 return pd_to_genpd(dev->pm_domain);
5248051b 182}
f721889f 183
d8600c8b
KK		 184static int genpd_stop_dev(const struct generic_pm_domain *genpd,
185 struct device *dev)
d5e4cbfe 186{
2b1d88cd 187 return GENPD_DEV_CALLBACK(genpd, int, stop, dev);
d5e4cbfe
RW		 188}
189
d8600c8b
KK		 190static int genpd_start_dev(const struct generic_pm_domain *genpd,
191 struct device *dev)
d5e4cbfe 192{
2b1d88cd 193 return GENPD_DEV_CALLBACK(genpd, int, start, dev);
d5e4cbfe
RW		 194}
195
c4bb3160 196static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd)
f721889f 197{
c4bb3160
RW		 198 bool ret = false;
199
200 if (!WARN_ON(atomic_read(&genpd->sd_count) == 0))
201 ret = !!atomic_dec_and_test(&genpd->sd_count);
202
203 return ret;
204}
205
206static void genpd_sd_counter_inc(struct generic_pm_domain *genpd)
207{
208 atomic_inc(&genpd->sd_count);
4e857c58 209 smp_mb__after_atomic();
f721889f
RW		 210}
211
afece3ab
TG		 212#ifdef CONFIG_DEBUG_FS
213static void genpd_update_accounting(struct generic_pm_domain *genpd)
214{
215 ktime_t delta, now;
216
217 now = ktime_get();
218 delta = ktime_sub(now, genpd->accounting_time);
219
220 /*
221 * If genpd->status is active, it means we are just
222 * out of off and so update the idle time and vice
223 * versa.
224 */
225 if (genpd->status == GPD_STATE_ACTIVE) {
226 int state_idx = genpd->state_idx;
227
228 genpd->states[state_idx].idle_time =
229 ktime_add(genpd->states[state_idx].idle_time, delta);
230 } else {
231 genpd->on_time = ktime_add(genpd->on_time, delta);
232 }
233
234 genpd->accounting_time = now;
235}
236#else
237static inline void genpd_update_accounting(struct generic_pm_domain *genpd) {}
238#endif
239
cd50c6d3
VK		 240static int _genpd_reeval_performance_state(struct generic_pm_domain *genpd,
241 unsigned int state)
242{
243 struct generic_pm_domain_data *pd_data;
244 struct pm_domain_data *pdd;
18edf49c 245 struct gpd_link *link;
cd50c6d3
VK		 246
247 /* New requested state is same as Max requested state */
248 if (state == genpd->performance_state)
249 return state;
250
251 /* New requested state is higher than Max requested state */
252 if (state > genpd->performance_state)
253 return state;
254
255 /* Traverse all devices within the domain */
256 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
257 pd_data = to_gpd_data(pdd);
258
259 if (pd_data->performance_state > state)
260 state = pd_data->performance_state;
261 }
262
263 /*
18edf49c
VK		 264 * Traverse all sub-domains within the domain. This can be
265 * done without any additional locking as the link->performance_state
266 * field is protected by the master genpd->lock, which is already taken.
267 *
268 * Also note that link->performance_state (subdomain's performance state
269 * requirement to master domain) is different from
270 * link->slave->performance_state (current performance state requirement
271 * of the devices/sub-domains of the subdomain) and so can have a
272 * different value.
273 *
274 * Note that we also take vote from powered-off sub-domains into account
275 * as the same is done for devices right now.
cd50c6d3 276 */
18edf49c
VK		 277 list_for_each_entry(link, &genpd->master_links, master_node) {
278 if (link->performance_state > state)
279 state = link->performance_state;
280 }
281
cd50c6d3
VK		 282 return state;
283}
284
285static int _genpd_set_performance_state(struct generic_pm_domain *genpd,
18edf49c 286 unsigned int state, int depth)
cd50c6d3 287{
18edf49c
VK		 288 struct generic_pm_domain *master;
289 struct gpd_link *link;
290 int master_state, ret;
cd50c6d3
VK		 291
292 if (state == genpd->performance_state)
293 return 0;
294
18edf49c
VK		 295 /* Propagate to masters of genpd */
296 list_for_each_entry(link, &genpd->slave_links, slave_node) {
297 master = link->master;
298
299 if (!master->set_performance_state)
300 continue;
301
302 /* Find master's performance state */
303 ret = dev_pm_opp_xlate_performance_state(genpd->opp_table,
304 master->opp_table,
305 state);
306 if (unlikely(ret < 0))
307 goto err;
308
309 master_state = ret;
310
311 genpd_lock_nested(master, depth + 1);
312
313 link->prev_performance_state = link->performance_state;
314 link->performance_state = master_state;
315 master_state = _genpd_reeval_performance_state(master,
316 master_state);
317 ret = _genpd_set_performance_state(master, master_state, depth + 1);
318 if (ret)
319 link->performance_state = link->prev_performance_state;
320
321 genpd_unlock(master);
322
323 if (ret)
324 goto err;
325 }
326
cd50c6d3
VK		 327 ret = genpd->set_performance_state(genpd, state);
328 if (ret)
18edf49c 329 goto err;
cd50c6d3
VK		 330
331 genpd->performance_state = state;
332 return 0;
18edf49c
VK		 333
334err:
335 /* Encountered an error, lets rollback */
336 list_for_each_entry_continue_reverse(link, &genpd->slave_links,
337 slave_node) {
338 master = link->master;
339
340 if (!master->set_performance_state)
341 continue;
342
343 genpd_lock_nested(master, depth + 1);
344
345 master_state = link->prev_performance_state;
346 link->performance_state = master_state;
347
348 master_state = _genpd_reeval_performance_state(master,
349 master_state);
350 if (_genpd_set_performance_state(master, master_state, depth + 1)) {
351 pr_err("%s: Failed to roll back to %d performance state\n",
352 master->name, master_state);
353 }
354
355 genpd_unlock(master);
356 }
357
358 return ret;
cd50c6d3
VK		 359}
360
42f6284a
VK		 361/**
362 * dev_pm_genpd_set_performance_state- Set performance state of device's power
363 * domain.
364 *
365 * @dev: Device for which the performance-state needs to be set.
366 * @state: Target performance state of the device. This can be set as 0 when the
367 * device doesn't have any performance state constraints left (And so
368 * the device wouldn't participate anymore to find the target
369 * performance state of the genpd).
370 *
371 * It is assumed that the users guarantee that the genpd wouldn't be detached
372 * while this routine is getting called.
373 *
374 * Returns 0 on success and negative error values on failures.
375 */
376int dev_pm_genpd_set_performance_state(struct device *dev, unsigned int state)
377{
378 struct generic_pm_domain *genpd;
cd50c6d3 379 struct generic_pm_domain_data *gpd_data;
42f6284a 380 unsigned int prev;
cd50c6d3 381 int ret;
42f6284a 382
3ea4ca92
UH		 383 genpd = dev_to_genpd_safe(dev);
384 if (!genpd)
42f6284a
VK		 385 return -ENODEV;
386
387 if (unlikely(!genpd->set_performance_state))
388 return -EINVAL;
389
e757e7fa
YL		 390 if (WARN_ON(!dev->power.subsys_data ||
391 !dev->power.subsys_data->domain_data))
42f6284a 392 return -EINVAL;
42f6284a
VK		 393
394 genpd_lock(genpd);
395
396 gpd_data = to_gpd_data(dev->power.subsys_data->domain_data);
397 prev = gpd_data->performance_state;
398 gpd_data->performance_state = state;
399
cd50c6d3 400 state = _genpd_reeval_performance_state(genpd, state);
18edf49c 401 ret = _genpd_set_performance_state(genpd, state, 0);
cd50c6d3 402 if (ret)
68de2fe5 403 gpd_data->performance_state = prev;
42f6284a 404
42f6284a
VK		 405 genpd_unlock(genpd);
406
407 return ret;
408}
409EXPORT_SYMBOL_GPL(dev_pm_genpd_set_performance_state);
410
86e12eac 411static int _genpd_power_on(struct generic_pm_domain *genpd, bool timed)
c8f0ea45 412{
fc5cbf0c 413 unsigned int state_idx = genpd->state_idx;
c8f0ea45
GU		 414 ktime_t time_start;
415 s64 elapsed_ns;
416 int ret;
417
418 if (!genpd->power_on)
419 return 0;
420
a4630c61
GU		 421 if (!timed)
422 return genpd->power_on(genpd);
423
c8f0ea45
GU		 424 time_start = ktime_get();
425 ret = genpd->power_on(genpd);
426 if (ret)
427 return ret;
428
429 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
fc5cbf0c 430 if (elapsed_ns <= genpd->states[state_idx].power_on_latency_ns)
c8f0ea45
GU		 431 return ret;
432
fc5cbf0c 433 genpd->states[state_idx].power_on_latency_ns = elapsed_ns;
c8f0ea45 434 genpd->max_off_time_changed = true;
6d7d5c32
RK		 435 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
436 genpd->name, "on", elapsed_ns);
c8f0ea45
GU		 437
438 return ret;
439}
440
86e12eac 441static int _genpd_power_off(struct generic_pm_domain *genpd, bool timed)
c8f0ea45 442{
fc5cbf0c 443 unsigned int state_idx = genpd->state_idx;
c8f0ea45
GU		 444 ktime_t time_start;
445 s64 elapsed_ns;
446 int ret;
447
448 if (!genpd->power_off)
449 return 0;
450
a4630c61
GU		 451 if (!timed)
452 return genpd->power_off(genpd);
453
c8f0ea45
GU		 454 time_start = ktime_get();
455 ret = genpd->power_off(genpd);
0cec68a9 456 if (ret)
c8f0ea45
GU		 457 return ret;
458
459 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
fc5cbf0c 460 if (elapsed_ns <= genpd->states[state_idx].power_off_latency_ns)
0cec68a9 461 return 0;
c8f0ea45 462
fc5cbf0c 463 genpd->states[state_idx].power_off_latency_ns = elapsed_ns;
c8f0ea45 464 genpd->max_off_time_changed = true;
6d7d5c32
RK		 465 pr_debug("%s: Power-%s latency exceeded, new value %lld ns\n",
466 genpd->name, "off", elapsed_ns);
c8f0ea45 467
0cec68a9 468 return 0;
c8f0ea45
GU		 469}
470
29e47e21 471/**
86e12eac 472 * genpd_queue_power_off_work - Queue up the execution of genpd_power_off().
a3d09c73 473 * @genpd: PM domain to power off.
29e47e21 474 *
86e12eac 475 * Queue up the execution of genpd_power_off() unless it's already been done
29e47e21
UH		 476 * before.
477 */
478static void genpd_queue_power_off_work(struct generic_pm_domain *genpd)
479{
480 queue_work(pm_wq, &genpd->power_off_work);
481}
482
1f8728b7
UH		 483/**
484 * genpd_power_off - Remove power from a given PM domain.
485 * @genpd: PM domain to power down.
3c64649d
UH		 486 * @one_dev_on: If invoked from genpd's ->runtime_suspend|resume() callback, the
487 * RPM status of the releated device is in an intermediate state, not yet turned
488 * into RPM_SUSPENDED. This means genpd_power_off() must allow one device to not
489 * be RPM_SUSPENDED, while it tries to power off the PM domain.
1f8728b7
UH		 490 *
491 * If all of the @genpd's devices have been suspended and all of its subdomains
492 * have been powered down, remove power from @genpd.
493 */
2da83545
UH		 494static int genpd_power_off(struct generic_pm_domain *genpd, bool one_dev_on,
495 unsigned int depth)
1f8728b7
UH		 496{
497 struct pm_domain_data *pdd;
498 struct gpd_link *link;
499 unsigned int not_suspended = 0;
500
501 /*
502 * Do not try to power off the domain in the following situations:
503 * (1) The domain is already in the "power off" state.
504 * (2) System suspend is in progress.
505 */
41e2c8e0 506 if (!genpd_status_on(genpd) || genpd->prepared_count > 0)
1f8728b7
UH		 507 return 0;
508
ffaa42e8
UH		 509 /*
510 * Abort power off for the PM domain in the following situations:
511 * (1) The domain is configured as always on.
512 * (2) When the domain has a subdomain being powered on.
513 */
ed61e18a
LC		 514 if (genpd_is_always_on(genpd) ||
515 genpd_is_rpm_always_on(genpd) ||
516 atomic_read(&genpd->sd_count) > 0)
1f8728b7
UH		 517 return -EBUSY;
518
519 list_for_each_entry(pdd, &genpd->dev_list, list_node) {
520 enum pm_qos_flags_status stat;
521
20f97caf 522 stat = dev_pm_qos_flags(pdd->dev, PM_QOS_FLAG_NO_POWER_OFF);
1f8728b7
UH		 523 if (stat > PM_QOS_FLAGS_NONE)
524 return -EBUSY;
525
526 /*
527 * Do not allow PM domain to be powered off, when an IRQ safe
528 * device is part of a non-IRQ safe domain.
529 */
530 if (!pm_runtime_suspended(pdd->dev) ||
531 irq_safe_dev_in_no_sleep_domain(pdd->dev, genpd))
532 not_suspended++;
533 }
534
3c64649d 535 if (not_suspended > 1 || (not_suspended == 1 && !one_dev_on))
1f8728b7
UH		 536 return -EBUSY;
537
538 if (genpd->gov && genpd->gov->power_down_ok) {
539 if (!genpd->gov->power_down_ok(&genpd->domain))
540 return -EAGAIN;
541 }
542
2c9b7f87
UH		 543 /* Default to shallowest state. */
544 if (!genpd->gov)
545 genpd->state_idx = 0;
546
1f8728b7
UH		 547 if (genpd->power_off) {
548 int ret;
549
550 if (atomic_read(&genpd->sd_count) > 0)
551 return -EBUSY;
552
553 /*
554 * If sd_count > 0 at this point, one of the subdomains hasn't
555 * managed to call genpd_power_on() for the master yet after
556 * incrementing it. In that case genpd_power_on() will wait
557 * for us to drop the lock, so we can call .power_off() and let
558 * the genpd_power_on() restore power for us (this shouldn't
559 * happen very often).
560 */
561 ret = _genpd_power_off(genpd, true);
562 if (ret)
563 return ret;
564 }
565
566 genpd->status = GPD_STATE_POWER_OFF;
afece3ab 567 genpd_update_accounting(genpd);
1f8728b7
UH		 568
569 list_for_each_entry(link, &genpd->slave_links, slave_node) {
570 genpd_sd_counter_dec(link->master);
2da83545
UH		 571 genpd_lock_nested(link->master, depth + 1);
572 genpd_power_off(link->master, false, depth + 1);
573 genpd_unlock(link->master);
1f8728b7
UH		 574 }
575
576 return 0;
577}
578
5248051b 579/**
86e12eac 580 * genpd_power_on - Restore power to a given PM domain and its masters.
5248051b 581 * @genpd: PM domain to power up.
0106ef51 582 * @depth: nesting count for lockdep.
5248051b 583 *
5063ce15 584 * Restore power to @genpd and all of its masters so that it is possible to
5248051b
RW		 585 * resume a device belonging to it.
586 */
86e12eac 587static int genpd_power_on(struct generic_pm_domain *genpd, unsigned int depth)
5248051b 588{
5063ce15 589 struct gpd_link *link;
5248051b
RW		 590 int ret = 0;
591
41e2c8e0 592 if (genpd_status_on(genpd))
3f241775 593 return 0;
5248051b 594
5063ce15
RW		 595 /*
596 * The list is guaranteed not to change while the loop below is being
597 * executed, unless one of the masters' .power_on() callbacks fiddles
598 * with it.
599 */
600 list_for_each_entry(link, &genpd->slave_links, slave_node) {
0106ef51
MS		 601 struct generic_pm_domain *master = link->master;
602
603 genpd_sd_counter_inc(master);
604
35241d12 605 genpd_lock_nested(master, depth + 1);
86e12eac 606 ret = genpd_power_on(master, depth + 1);
35241d12 607 genpd_unlock(master);
5248051b 608
5063ce15 609 if (ret) {
0106ef51 610 genpd_sd_counter_dec(master);
9e08cf42 611 goto err;
5063ce15 612 }
5248051b
RW		 613 }
614
86e12eac 615 ret = _genpd_power_on(genpd, true);
c8f0ea45
GU		 616 if (ret)
617 goto err;
5248051b 618
ba2bbfbf 619 genpd->status = GPD_STATE_ACTIVE;
afece3ab
TG		 620 genpd_update_accounting(genpd);
621
3f241775 622 return 0;
9e08cf42
RW		 623
624 err:
29e47e21
UH		 625 list_for_each_entry_continue_reverse(link,
626 &genpd->slave_links,
627 slave_node) {
5063ce15 628 genpd_sd_counter_dec(link->master);
2da83545
UH		 629 genpd_lock_nested(link->master, depth + 1);
630 genpd_power_off(link->master, false, depth + 1);
631 genpd_unlock(link->master);
29e47e21 632 }
9e08cf42 633
3f241775
RW		 634 return ret;
635}
636
ea71c596
UH		 637static int genpd_dev_pm_start(struct device *dev)
638{
639 struct generic_pm_domain *genpd = dev_to_genpd(dev);
640
641 return genpd_start_dev(genpd, dev);
642}
643
6ff7bb0d
RW		 644static int genpd_dev_pm_qos_notifier(struct notifier_block *nb,
645 unsigned long val, void *ptr)
646{
647 struct generic_pm_domain_data *gpd_data;
648 struct device *dev;
649
650 gpd_data = container_of(nb, struct generic_pm_domain_data, nb);
6ff7bb0d 651 dev = gpd_data->base.dev;
6ff7bb0d
RW		 652
653 for (;;) {
654 struct generic_pm_domain *genpd;
655 struct pm_domain_data *pdd;
656
657 spin_lock_irq(&dev->power.lock);
658
659 pdd = dev->power.subsys_data ?
660 dev->power.subsys_data->domain_data : NULL;
b4883ca4 661 if (pdd) {
6ff7bb0d
RW		 662 to_gpd_data(pdd)->td.constraint_changed = true;
663 genpd = dev_to_genpd(dev);
664 } else {
665 genpd = ERR_PTR(-ENODATA);
666 }
667
668 spin_unlock_irq(&dev->power.lock);
669
670 if (!IS_ERR(genpd)) {
35241d12 671 genpd_lock(genpd);
6ff7bb0d 672 genpd->max_off_time_changed = true;
35241d12 673 genpd_unlock(genpd);
6ff7bb0d
RW		 674 }
675
676 dev = dev->parent;
677 if (!dev || dev->power.ignore_children)
678 break;
679 }
680
681 return NOTIFY_DONE;
682}
683
f721889f
RW		 684/**
685 * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0.
686 * @work: Work structure used for scheduling the execution of this function.
687 */
688static void genpd_power_off_work_fn(struct work_struct *work)
689{
690 struct generic_pm_domain *genpd;
691
692 genpd = container_of(work, struct generic_pm_domain, power_off_work);
693
35241d12 694 genpd_lock(genpd);
2da83545 695 genpd_power_off(genpd, false, 0);
35241d12 696 genpd_unlock(genpd);
f721889f
RW		 697}
698
54eeddbf
UH		 699/**
700 * __genpd_runtime_suspend - walk the hierarchy of ->runtime_suspend() callbacks
701 * @dev: Device to handle.
702 */
703static int __genpd_runtime_suspend(struct device *dev)
704{
705 int (*cb)(struct device *__dev);
706
707 if (dev->type && dev->type->pm)
708 cb = dev->type->pm->runtime_suspend;
709 else if (dev->class && dev->class->pm)
710 cb = dev->class->pm->runtime_suspend;
711 else if (dev->bus && dev->bus->pm)
712 cb = dev->bus->pm->runtime_suspend;
713 else
714 cb = NULL;
715
716 if (!cb && dev->driver && dev->driver->pm)
717 cb = dev->driver->pm->runtime_suspend;
718
719 return cb ? cb(dev) : 0;
720}
721
722/**
723 * __genpd_runtime_resume - walk the hierarchy of ->runtime_resume() callbacks
724 * @dev: Device to handle.
725 */
726static int __genpd_runtime_resume(struct device *dev)
727{
728 int (*cb)(struct device *__dev);
729
730 if (dev->type && dev->type->pm)
731 cb = dev->type->pm->runtime_resume;
732 else if (dev->class && dev->class->pm)
733 cb = dev->class->pm->runtime_resume;
734 else if (dev->bus && dev->bus->pm)
735 cb = dev->bus->pm->runtime_resume;
736 else
737 cb = NULL;
738
739 if (!cb && dev->driver && dev->driver->pm)
740 cb = dev->driver->pm->runtime_resume;
741
742 return cb ? cb(dev) : 0;
743}
744
f721889f 745/**
795bd2e7 746 * genpd_runtime_suspend - Suspend a device belonging to I/O PM domain.
f721889f
RW		 747 * @dev: Device to suspend.
748 *
749 * Carry out a runtime suspend of a device under the assumption that its
750 * pm_domain field points to the domain member of an object of type
751 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
752 */
795bd2e7 753static int genpd_runtime_suspend(struct device *dev)
f721889f
RW		 754{
755 struct generic_pm_domain *genpd;
9df3921e 756 bool (*suspend_ok)(struct device *__dev);
2b1d88cd 757 struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
ffe12855 758 bool runtime_pm = pm_runtime_enabled(dev);
2b1d88cd
UH		 759 ktime_t time_start;
760 s64 elapsed_ns;
d5e4cbfe 761 int ret;
f721889f
RW		 762
763 dev_dbg(dev, "%s()\n", __func__);
764
5248051b
RW		 765 genpd = dev_to_genpd(dev);
766 if (IS_ERR(genpd))
f721889f
RW		 767 return -EINVAL;
768
ffe12855
UH		 769 /*
770 * A runtime PM centric subsystem/driver may re-use the runtime PM
771 * callbacks for other purposes than runtime PM. In those scenarios
772 * runtime PM is disabled. Under these circumstances, we shall skip
773 * validating/measuring the PM QoS latency.
774 */
9df3921e
UH		 775 suspend_ok = genpd->gov ? genpd->gov->suspend_ok : NULL;
776 if (runtime_pm && suspend_ok && !suspend_ok(dev))
b02c999a
RW		 777 return -EBUSY;
778
2b1d88cd 779 /* Measure suspend latency. */
d33d5a6c 780 time_start = 0;
ffe12855
UH		 781 if (runtime_pm)
782 time_start = ktime_get();
2b1d88cd 783
54eeddbf 784 ret = __genpd_runtime_suspend(dev);
d5e4cbfe
RW		 785 if (ret)
786 return ret;
17b75eca 787
2b1d88cd 788 ret = genpd_stop_dev(genpd, dev);
ba2bbfbf 789 if (ret) {
54eeddbf 790 __genpd_runtime_resume(dev);
ba2bbfbf
UH		 791 return ret;
792 }
793
2b1d88cd 794 /* Update suspend latency value if the measured time exceeds it. */
ffe12855
UH		 795 if (runtime_pm) {
796 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
797 if (elapsed_ns > td->suspend_latency_ns) {
798 td->suspend_latency_ns = elapsed_ns;
799 dev_dbg(dev, "suspend latency exceeded, %lld ns\n",
800 elapsed_ns);
801 genpd->max_off_time_changed = true;
802 td->constraint_changed = true;
803 }
2b1d88cd
UH		 804 }
805
0aa2a221 806 /*
d716f479
LI		 807 * If power.irq_safe is set, this routine may be run with
808 * IRQs disabled, so suspend only if the PM domain also is irq_safe.
0aa2a221 809 */
d716f479 810 if (irq_safe_dev_in_no_sleep_domain(dev, genpd))
0aa2a221
RW		 811 return 0;
812
35241d12 813 genpd_lock(genpd);
2da83545 814 genpd_power_off(genpd, true, 0);
35241d12 815 genpd_unlock(genpd);
f721889f
RW		 816
817 return 0;
818}
819
f721889f 820/**
795bd2e7 821 * genpd_runtime_resume - Resume a device belonging to I/O PM domain.
f721889f
RW		 822 * @dev: Device to resume.
823 *
824 * Carry out a runtime resume of a device under the assumption that its
825 * pm_domain field points to the domain member of an object of type
826 * struct generic_pm_domain representing a PM domain consisting of I/O devices.
827 */
795bd2e7 828static int genpd_runtime_resume(struct device *dev)
f721889f
RW		 829{
830 struct generic_pm_domain *genpd;
2b1d88cd 831 struct gpd_timing_data *td = &dev_gpd_data(dev)->td;
ffe12855 832 bool runtime_pm = pm_runtime_enabled(dev);
2b1d88cd
UH		 833 ktime_t time_start;
834 s64 elapsed_ns;
f721889f 835 int ret;
ba2bbfbf 836 bool timed = true;
f721889f
RW		 837
838 dev_dbg(dev, "%s()\n", __func__);
839
5248051b
RW		 840 genpd = dev_to_genpd(dev);
841 if (IS_ERR(genpd))
f721889f
RW		 842 return -EINVAL;
843
d716f479
LI		 844 /*
845 * As we don't power off a non IRQ safe domain, which holds
846 * an IRQ safe device, we don't need to restore power to it.
847 */
848 if (irq_safe_dev_in_no_sleep_domain(dev, genpd)) {
ba2bbfbf
UH		 849 timed = false;
850 goto out;
851 }
0aa2a221 852
35241d12 853 genpd_lock(genpd);
86e12eac 854 ret = genpd_power_on(genpd, 0);
35241d12 855 genpd_unlock(genpd);
c6d22b37 856
ba2bbfbf
UH		 857 if (ret)
858 return ret;
c6d22b37 859
ba2bbfbf 860 out:
2b1d88cd 861 /* Measure resume latency. */
ab51e6ba 862 time_start = 0;
ffe12855 863 if (timed && runtime_pm)
2b1d88cd
UH		 864 time_start = ktime_get();
865
076395ca
LP		 866 ret = genpd_start_dev(genpd, dev);
867 if (ret)
868 goto err_poweroff;
869
54eeddbf 870 ret = __genpd_runtime_resume(dev);
076395ca
LP		 871 if (ret)
872 goto err_stop;
2b1d88cd
UH		 873
874 /* Update resume latency value if the measured time exceeds it. */
ffe12855 875 if (timed && runtime_pm) {
2b1d88cd
UH		 876 elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start));
877 if (elapsed_ns > td->resume_latency_ns) {
878 td->resume_latency_ns = elapsed_ns;
879 dev_dbg(dev, "resume latency exceeded, %lld ns\n",
880 elapsed_ns);
881 genpd->max_off_time_changed = true;
882 td->constraint_changed = true;
883 }
884 }
17b75eca 885
f721889f 886 return 0;
076395ca
LP		 887
888err_stop:
889 genpd_stop_dev(genpd, dev);
890err_poweroff:
d716f479
LI		 891 if (!pm_runtime_is_irq_safe(dev) ||
892 (pm_runtime_is_irq_safe(dev) && genpd_is_irq_safe(genpd))) {
35241d12 893 genpd_lock(genpd);
2da83545 894 genpd_power_off(genpd, true, 0);
35241d12 895 genpd_unlock(genpd);
076395ca
LP		 896 }
897
898 return ret;
f721889f
RW		 899}
900
39ac5ba5
TB		 901static bool pd_ignore_unused;
902static int __init pd_ignore_unused_setup(char *__unused)
903{
904 pd_ignore_unused = true;
905 return 1;
906}
907__setup("pd_ignore_unused", pd_ignore_unused_setup);
908
17f2ae7f 909/**
86e12eac 910 * genpd_power_off_unused - Power off all PM domains with no devices in use.
17f2ae7f 911 */
86e12eac 912static int __init genpd_power_off_unused(void)
17f2ae7f
RW		 913{
914 struct generic_pm_domain *genpd;
915
39ac5ba5
TB		 916 if (pd_ignore_unused) {
917 pr_warn("genpd: Not disabling unused power domains\n");
bb4b72fc 918 return 0;
39ac5ba5
TB		 919 }
920
17f2ae7f
RW		 921 mutex_lock(&gpd_list_lock);
922
923 list_for_each_entry(genpd, &gpd_list, gpd_list_node)
924 genpd_queue_power_off_work(genpd);
925
926 mutex_unlock(&gpd_list_lock);
17f2ae7f 927
2fe71dcd
UH		 928 return 0;
929}
86e12eac 930late_initcall(genpd_power_off_unused);
2fe71dcd 931
0159ec67
JH		 932#ifdef CONFIG_PM_SLEEP
933
596ba34b 934/**
86e12eac 935 * genpd_sync_power_off - Synchronously power off a PM domain and its masters.
596ba34b 936 * @genpd: PM domain to power off, if possible.
0883ac03
UH		 937 * @use_lock: use the lock.
938 * @depth: nesting count for lockdep.
596ba34b
RW		 939 *
940 * Check if the given PM domain can be powered off (during system suspend or
5063ce15 941 * hibernation) and do that if so. Also, in that case propagate to its masters.
596ba34b 942 *
77f827de 943 * This function is only called in "noirq" and "syscore" stages of system power
0883ac03
UH		 944 * transitions. The "noirq" callbacks may be executed asynchronously, thus in
945 * these cases the lock must be held.
596ba34b 946 */
0883ac03
UH		 947static void genpd_sync_power_off(struct generic_pm_domain *genpd, bool use_lock,
948 unsigned int depth)
596ba34b 949{
5063ce15 950 struct gpd_link *link;
596ba34b 951
ffaa42e8 952 if (!genpd_status_on(genpd) || genpd_is_always_on(genpd))
596ba34b
RW		 953 return;
954
c4bb3160
RW		 955 if (genpd->suspended_count != genpd->device_count
956 || atomic_read(&genpd->sd_count) > 0)
596ba34b
RW		 957 return;
958
fc5cbf0c
AH		 959 /* Choose the deepest state when suspending */
960 genpd->state_idx = genpd->state_count - 1;
1c14967c
UH		 961 if (_genpd_power_off(genpd, false))
962 return;
596ba34b 963
17b75eca 964 genpd->status = GPD_STATE_POWER_OFF;
5063ce15
RW		 965
966 list_for_each_entry(link, &genpd->slave_links, slave_node) {
967 genpd_sd_counter_dec(link->master);
0883ac03
UH		 968
969 if (use_lock)
970 genpd_lock_nested(link->master, depth + 1);
971
972 genpd_sync_power_off(link->master, use_lock, depth + 1);
973
974 if (use_lock)
975 genpd_unlock(link->master);
596ba34b
RW		 976 }
977}
978
802d8b49 979/**
86e12eac 980 * genpd_sync_power_on - Synchronously power on a PM domain and its masters.
802d8b49 981 * @genpd: PM domain to power on.
0883ac03
UH		 982 * @use_lock: use the lock.
983 * @depth: nesting count for lockdep.
802d8b49 984 *
77f827de 985 * This function is only called in "noirq" and "syscore" stages of system power
0883ac03
UH		 986 * transitions. The "noirq" callbacks may be executed asynchronously, thus in
987 * these cases the lock must be held.
802d8b49 988 */
0883ac03
UH		 989static void genpd_sync_power_on(struct generic_pm_domain *genpd, bool use_lock,
990 unsigned int depth)
802d8b49
RW		 991{
992 struct gpd_link *link;
993
41e2c8e0 994 if (genpd_status_on(genpd))
802d8b49
RW		 995 return;
996
997 list_for_each_entry(link, &genpd->slave_links, slave_node) {
802d8b49 998 genpd_sd_counter_inc(link->master);
0883ac03
UH		 999
1000 if (use_lock)
1001 genpd_lock_nested(link->master, depth + 1);
1002
1003 genpd_sync_power_on(link->master, use_lock, depth + 1);
1004
1005 if (use_lock)
1006 genpd_unlock(link->master);
802d8b49
RW		 1007 }
1008
86e12eac 1009 _genpd_power_on(genpd, false);
802d8b49
RW		 1010
1011 genpd->status = GPD_STATE_ACTIVE;
1012}
1013
4ecd6e65
RW		 1014/**
1015 * resume_needed - Check whether to resume a device before system suspend.
1016 * @dev: Device to check.
1017 * @genpd: PM domain the device belongs to.
1018 *
1019 * There are two cases in which a device that can wake up the system from sleep
9e9704ea 1020 * states should be resumed by genpd_prepare(): (1) if the device is enabled
4ecd6e65
RW		 1021 * to wake up the system and it has to remain active for this purpose while the
1022 * system is in the sleep state and (2) if the device is not enabled to wake up
1023 * the system from sleep states and it generally doesn't generate wakeup signals
1024 * by itself (those signals are generated on its behalf by other parts of the
1025 * system). In the latter case it may be necessary to reconfigure the device's
1026 * wakeup settings during system suspend, because it may have been set up to
1027 * signal remote wakeup from the system's working state as needed by runtime PM.
1028 * Return 'true' in either of the above cases.
1029 */
d8600c8b
KK		 1030static bool resume_needed(struct device *dev,
1031 const struct generic_pm_domain *genpd)
4ecd6e65
RW		 1032{
1033 bool active_wakeup;
1034
1035 if (!device_can_wakeup(dev))
1036 return false;
1037
d0af45f1 1038 active_wakeup = genpd_is_active_wakeup(genpd);
4ecd6e65
RW		 1039 return device_may_wakeup(dev) ? active_wakeup : !active_wakeup;
1040}
1041
596ba34b 1042/**
9e9704ea 1043 * genpd_prepare - Start power transition of a device in a PM domain.
596ba34b
RW		 1044 * @dev: Device to start the transition of.
1045 *
1046 * Start a power transition of a device (during a system-wide power transition)
1047 * under the assumption that its pm_domain field points to the domain member of
1048 * an object of type struct generic_pm_domain representing a PM domain
1049 * consisting of I/O devices.
1050 */
9e9704ea 1051static int genpd_prepare(struct device *dev)
596ba34b
RW		 1052{
1053 struct generic_pm_domain *genpd;
b6c10c84 1054 int ret;
596ba34b
RW		 1055
1056 dev_dbg(dev, "%s()\n", __func__);
1057
1058 genpd = dev_to_genpd(dev);
1059 if (IS_ERR(genpd))
1060 return -EINVAL;
1061
17b75eca
RW		 1062 /*
1063 * If a wakeup request is pending for the device, it should be woken up
1064 * at this point and a system wakeup event should be reported if it's
1065 * set up to wake up the system from sleep states.
1066 */
4ecd6e65
RW		 1067 if (resume_needed(dev, genpd))
1068 pm_runtime_resume(dev);
1069
35241d12 1070 genpd_lock(genpd);
596ba34b 1071
39dd0f23 1072 if (genpd->prepared_count++ == 0)
65533bbf 1073 genpd->suspended_count = 0;
17b75eca 1074
35241d12 1075 genpd_unlock(genpd);
596ba34b 1076
b6c10c84 1077 ret = pm_generic_prepare(dev);
5241ab40 1078 if (ret < 0) {
35241d12 1079 genpd_lock(genpd);
b6c10c84 1080
39dd0f23 1081 genpd->prepared_count--;
b6c10c84 1082
35241d12 1083 genpd_unlock(genpd);
b6c10c84 1084 }
17b75eca 1085
5241ab40
UH		 1086 /* Never return 1, as genpd don't cope with the direct_complete path. */
1087 return ret >= 0 ? 0 : ret;
596ba34b
RW		 1088}
1089
0496c8ae 1090/**
10da6542
MP		 1091 * genpd_finish_suspend - Completion of suspend or hibernation of device in an
1092 * I/O pm domain.
0496c8ae 1093 * @dev: Device to suspend.
10da6542 1094 * @poweroff: Specifies if this is a poweroff_noirq or suspend_noirq callback.
0496c8ae
RW		 1095 *
1096 * Stop the device and remove power from the domain if all devices in it have
1097 * been stopped.
1098 */
10da6542 1099static int genpd_finish_suspend(struct device *dev, bool poweroff)
0496c8ae
RW		 1100{
1101 struct generic_pm_domain *genpd;
a935424b 1102 int ret = 0;
0496c8ae 1103
0496c8ae
RW		 1104 genpd = dev_to_genpd(dev);
1105 if (IS_ERR(genpd))
1106 return -EINVAL;
596ba34b 1107
10da6542
MP		 1108 if (poweroff)
1109 ret = pm_generic_poweroff_noirq(dev);
1110 else
1111 ret = pm_generic_suspend_noirq(dev);
1112 if (ret)
1113 return ret;
1114
a935424b
UH		 1115 if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd))
1116 return 0;
1117
17218e00
RW		 1118 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1119 !pm_runtime_status_suspended(dev)) {
1120 ret = genpd_stop_dev(genpd, dev);
a935424b
UH		 1121 if (ret) {
1122 if (poweroff)
1123 pm_generic_restore_noirq(dev);
1124 else
1125 pm_generic_resume_noirq(dev);
122a2237 1126 return ret;
a935424b 1127 }
122a2237
UH		 1128 }
1129
0883ac03 1130 genpd_lock(genpd);
596ba34b 1131 genpd->suspended_count++;
0883ac03
UH		 1132 genpd_sync_power_off(genpd, true, 0);
1133 genpd_unlock(genpd);
596ba34b
RW		 1134
1135 return 0;
1136}
1137
10da6542 1138/**
9e9704ea 1139 * genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain.
10da6542
MP		 1140 * @dev: Device to suspend.
1141 *
1142 * Stop the device and remove power from the domain if all devices in it have
1143 * been stopped.
1144 */
9e9704ea 1145static int genpd_suspend_noirq(struct device *dev)
10da6542
MP		 1146{
1147 dev_dbg(dev, "%s()\n", __func__);
1148
1149 return genpd_finish_suspend(dev, false);
1150}
1151
596ba34b 1152/**
9e9704ea 1153 * genpd_resume_noirq - Start of resume of device in an I/O PM domain.
596ba34b
RW		 1154 * @dev: Device to resume.
1155 *
0496c8ae 1156 * Restore power to the device's PM domain, if necessary, and start the device.
596ba34b 1157 */
9e9704ea 1158static int genpd_resume_noirq(struct device *dev)
596ba34b
RW		 1159{
1160 struct generic_pm_domain *genpd;
a935424b 1161 int ret;
596ba34b
RW		 1162
1163 dev_dbg(dev, "%s()\n", __func__);
1164
1165 genpd = dev_to_genpd(dev);
1166 if (IS_ERR(genpd))
1167 return -EINVAL;
1168
d0af45f1 1169 if (dev->power.wakeup_path && genpd_is_active_wakeup(genpd))
a935424b 1170 return pm_generic_resume_noirq(dev);
596ba34b 1171
0883ac03
UH		 1172 genpd_lock(genpd);
1173 genpd_sync_power_on(genpd, true, 0);
596ba34b 1174 genpd->suspended_count--;
0883ac03 1175 genpd_unlock(genpd);
596ba34b 1176
17218e00
RW		 1177 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1178 !pm_runtime_status_suspended(dev)) {
1179 ret = genpd_start_dev(genpd, dev);
a935424b
UH		 1180 if (ret)
1181 return ret;
1182 }
122a2237 1183
a935424b 1184 return pm_generic_resume_noirq(dev);
596ba34b
RW		 1185}
1186
0496c8ae 1187/**
9e9704ea 1188 * genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain.
596ba34b
RW		 1189 * @dev: Device to freeze.
1190 *
1191 * Carry out a late freeze of a device under the assumption that its
1192 * pm_domain field points to the domain member of an object of type
1193 * struct generic_pm_domain representing a power domain consisting of I/O
1194 * devices.
1195 */
9e9704ea 1196static int genpd_freeze_noirq(struct device *dev)
596ba34b 1197{
d8600c8b 1198 const struct generic_pm_domain *genpd;
122a2237 1199 int ret = 0;
596ba34b
RW		 1200
1201 dev_dbg(dev, "%s()\n", __func__);
1202
1203 genpd = dev_to_genpd(dev);
1204 if (IS_ERR(genpd))
1205 return -EINVAL;
1206
10da6542
MP		 1207 ret = pm_generic_freeze_noirq(dev);
1208 if (ret)
1209 return ret;
1210
17218e00
RW		 1211 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1212 !pm_runtime_status_suspended(dev))
1213 ret = genpd_stop_dev(genpd, dev);
122a2237
UH		 1214
1215 return ret;
0496c8ae 1216}
596ba34b 1217
0496c8ae 1218/**
9e9704ea 1219 * genpd_thaw_noirq - Early thaw of device in an I/O PM domain.
0496c8ae
RW		 1220 * @dev: Device to thaw.
1221 *
1222 * Start the device, unless power has been removed from the domain already
1223 * before the system transition.
1224 */
9e9704ea 1225static int genpd_thaw_noirq(struct device *dev)
0496c8ae 1226{
d8600c8b 1227 const struct generic_pm_domain *genpd;
122a2237 1228 int ret = 0;
596ba34b 1229
0496c8ae 1230 dev_dbg(dev, "%s()\n", __func__);
596ba34b 1231
0496c8ae
RW		 1232 genpd = dev_to_genpd(dev);
1233 if (IS_ERR(genpd))
1234 return -EINVAL;
1235
17218e00
RW		 1236 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1237 !pm_runtime_status_suspended(dev)) {
1238 ret = genpd_start_dev(genpd, dev);
10da6542
MP		 1239 if (ret)
1240 return ret;
1241 }
122a2237 1242
10da6542
MP		 1243 return pm_generic_thaw_noirq(dev);
1244}
1245
1246/**
9e9704ea 1247 * genpd_poweroff_noirq - Completion of hibernation of device in an
10da6542
MP		 1248 * I/O PM domain.
1249 * @dev: Device to poweroff.
1250 *
1251 * Stop the device and remove power from the domain if all devices in it have
1252 * been stopped.
1253 */
9e9704ea 1254static int genpd_poweroff_noirq(struct device *dev)
10da6542
MP		 1255{
1256 dev_dbg(dev, "%s()\n", __func__);
1257
1258 return genpd_finish_suspend(dev, true);
596ba34b
RW		 1259}
1260
596ba34b 1261/**
9e9704ea 1262 * genpd_restore_noirq - Start of restore of device in an I/O PM domain.
596ba34b
RW		 1263 * @dev: Device to resume.
1264 *
0496c8ae
RW		 1265 * Make sure the domain will be in the same power state as before the
1266 * hibernation the system is resuming from and start the device if necessary.
596ba34b 1267 */
9e9704ea 1268static int genpd_restore_noirq(struct device *dev)
596ba34b
RW		 1269{
1270 struct generic_pm_domain *genpd;
122a2237 1271 int ret = 0;
596ba34b
RW		 1272
1273 dev_dbg(dev, "%s()\n", __func__);
1274
1275 genpd = dev_to_genpd(dev);
1276 if (IS_ERR(genpd))
1277 return -EINVAL;
1278
1279 /*
65533bbf
RW		 1280 * At this point suspended_count == 0 means we are being run for the
1281 * first time for the given domain in the present cycle.
596ba34b 1282 */
0883ac03 1283 genpd_lock(genpd);
39dd0f23 1284 if (genpd->suspended_count++ == 0)
596ba34b 1285 /*
65533bbf 1286 * The boot kernel might put the domain into arbitrary state,
86e12eac 1287 * so make it appear as powered off to genpd_sync_power_on(),
802d8b49 1288 * so that it tries to power it on in case it was really off.
596ba34b 1289 */
65533bbf 1290 genpd->status = GPD_STATE_POWER_OFF;
18dd2ece 1291
0883ac03
UH		 1292 genpd_sync_power_on(genpd, true, 0);
1293 genpd_unlock(genpd);
596ba34b 1294
17218e00
RW		 1295 if (genpd->dev_ops.stop && genpd->dev_ops.start &&
1296 !pm_runtime_status_suspended(dev)) {
1297 ret = genpd_start_dev(genpd, dev);
10da6542
MP		 1298 if (ret)
1299 return ret;
1300 }
122a2237 1301
10da6542 1302 return pm_generic_restore_noirq(dev);
596ba34b
RW		 1303}
1304
1305/**
9e9704ea 1306 * genpd_complete - Complete power transition of a device in a power domain.
596ba34b
RW		 1307 * @dev: Device to complete the transition of.
1308 *
1309 * Complete a power transition of a device (during a system-wide power
1310 * transition) under the assumption that its pm_domain field points to the
1311 * domain member of an object of type struct generic_pm_domain representing
1312 * a power domain consisting of I/O devices.
1313 */
9e9704ea 1314static void genpd_complete(struct device *dev)
596ba34b
RW		 1315{
1316 struct generic_pm_domain *genpd;
596ba34b
RW		 1317
1318 dev_dbg(dev, "%s()\n", __func__);
1319
1320 genpd = dev_to_genpd(dev);
1321 if (IS_ERR(genpd))
1322 return;
1323
4d23a5e8
UH		 1324 pm_generic_complete(dev);
1325
35241d12 1326 genpd_lock(genpd);
596ba34b 1327
39dd0f23 1328 genpd->prepared_count--;
4d23a5e8
UH		 1329 if (!genpd->prepared_count)
1330 genpd_queue_power_off_work(genpd);
596ba34b 1331
35241d12 1332 genpd_unlock(genpd);
596ba34b
RW		 1333}
1334
77f827de 1335/**
d47e6464 1336 * genpd_syscore_switch - Switch power during system core suspend or resume.
77f827de
RW		 1337 * @dev: Device that normally is marked as "always on" to switch power for.
1338 *
1339 * This routine may only be called during the system core (syscore) suspend or
1340 * resume phase for devices whose "always on" flags are set.
1341 */
d47e6464 1342static void genpd_syscore_switch(struct device *dev, bool suspend)
77f827de
RW		 1343{
1344 struct generic_pm_domain *genpd;
1345
fe0c2baa
UH		 1346 genpd = dev_to_genpd_safe(dev);
1347 if (!genpd)
77f827de
RW		 1348 return;
1349
1350 if (suspend) {
1351 genpd->suspended_count++;
0883ac03 1352 genpd_sync_power_off(genpd, false, 0);
77f827de 1353 } else {
0883ac03 1354 genpd_sync_power_on(genpd, false, 0);
77f827de
RW		 1355 genpd->suspended_count--;
1356 }
1357}
d47e6464
UH		 1358
1359void pm_genpd_syscore_poweroff(struct device *dev)
1360{
1361 genpd_syscore_switch(dev, true);
1362}
1363EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweroff);
1364
1365void pm_genpd_syscore_poweron(struct device *dev)
1366{
1367 genpd_syscore_switch(dev, false);
1368}
1369EXPORT_SYMBOL_GPL(pm_genpd_syscore_poweron);
77f827de 1370
d30d819d 1371#else /* !CONFIG_PM_SLEEP */
596ba34b 1372
9e9704ea
UH		 1373#define genpd_prepare NULL
1374#define genpd_suspend_noirq NULL
1375#define genpd_resume_noirq NULL
1376#define genpd_freeze_noirq NULL
1377#define genpd_thaw_noirq NULL
1378#define genpd_poweroff_noirq NULL
1379#define genpd_restore_noirq NULL
1380#define genpd_complete NULL
596ba34b
RW		 1381
1382#endif /* CONFIG_PM_SLEEP */
1383
a174920d 1384static struct generic_pm_domain_data *genpd_alloc_dev_data(struct device *dev)
1d5fcfec
RW		 1385{
1386 struct generic_pm_domain_data *gpd_data;
3e235685
UH		 1387 int ret;
1388
1389 ret = dev_pm_get_subsys_data(dev);
1390 if (ret)
1391 return ERR_PTR(ret);
1d5fcfec
RW		 1392
1393 gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL);
3e235685
UH		 1394 if (!gpd_data) {
1395 ret = -ENOMEM;
1396 goto err_put;
1397 }
1d5fcfec 1398
f104e1e5 1399 gpd_data->base.dev = dev;
f104e1e5 1400 gpd_data->td.constraint_changed = true;
0759e80b 1401 gpd_data->td.effective_constraint_ns = PM_QOS_RESUME_LATENCY_NO_CONSTRAINT_NS;
f104e1e5
UH		 1402 gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier;
1403
1404 spin_lock_irq(&dev->power.lock);
1405
1406 if (dev->power.subsys_data->domain_data) {
1407 ret = -EINVAL;
1408 goto err_free;
1409 }
1410
1411 dev->power.subsys_data->domain_data = &gpd_data->base;
f104e1e5
UH		 1412
1413 spin_unlock_irq(&dev->power.lock);
1414
1d5fcfec 1415 return gpd_data;
3e235685 1416
f104e1e5
UH		 1417 err_free:
1418 spin_unlock_irq(&dev->power.lock);
1419 kfree(gpd_data);
3e235685
UH		 1420 err_put:
1421 dev_pm_put_subsys_data(dev);
1422 return ERR_PTR(ret);
1d5fcfec
RW		 1423}
1424
49d400c7
UH		 1425static void genpd_free_dev_data(struct device *dev,
1426 struct generic_pm_domain_data *gpd_data)
1d5fcfec 1427{
f104e1e5
UH		 1428 spin_lock_irq(&dev->power.lock);
1429
f104e1e5
UH		 1430 dev->power.subsys_data->domain_data = NULL;
1431
1432 spin_unlock_irq(&dev->power.lock);
1433
1d5fcfec 1434 kfree(gpd_data);
3e235685 1435 dev_pm_put_subsys_data(dev);
1d5fcfec
RW		 1436}
1437
b24e1965
UH		 1438static void genpd_update_cpumask(struct generic_pm_domain *genpd,
1439 int cpu, bool set, unsigned int depth)
eb594b73
UH		 1440{
1441 struct gpd_link *link;
1442
1443 if (!genpd_is_cpu_domain(genpd))
1444 return;
1445
1446 list_for_each_entry(link, &genpd->slave_links, slave_node) {
1447 struct generic_pm_domain *master = link->master;
1448
1449 genpd_lock_nested(master, depth + 1);
b24e1965 1450 genpd_update_cpumask(master, cpu, set, depth + 1);
eb594b73
UH		 1451 genpd_unlock(master);
1452 }
1453
1454 if (set)
1455 cpumask_set_cpu(cpu, genpd->cpus);
1456 else
1457 cpumask_clear_cpu(cpu, genpd->cpus);
1458}
1459
b24e1965
UH		 1460static void genpd_set_cpumask(struct generic_pm_domain *genpd, int cpu)
1461{
1462 if (cpu >= 0)
1463 genpd_update_cpumask(genpd, cpu, true, 0);
1464}
1465
1466static void genpd_clear_cpumask(struct generic_pm_domain *genpd, int cpu)
1467{
1468 if (cpu >= 0)
1469 genpd_update_cpumask(genpd, cpu, false, 0);
1470}
1471
1472static int genpd_get_cpu(struct generic_pm_domain *genpd, struct device *dev)
eb594b73
UH		 1473{
1474 int cpu;
1475
1476 if (!genpd_is_cpu_domain(genpd))
b24e1965 1477 return -1;
eb594b73
UH		 1478
1479 for_each_possible_cpu(cpu) {
b24e1965
UH		 1480 if (get_cpu_device(cpu) == dev)
1481 return cpu;
eb594b73 1482 }
eb594b73 1483
b24e1965 1484 return -1;
eb594b73
UH		 1485}
1486
f9ccd7c3
UH		 1487static int genpd_add_device(struct generic_pm_domain *genpd, struct device *dev,
1488 struct device *base_dev)
f721889f 1489{
c0356db7 1490 struct generic_pm_domain_data *gpd_data;
f9ccd7c3 1491 int ret;
f721889f
RW		 1492
1493 dev_dbg(dev, "%s()\n", __func__);
1494
1495 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev))
1496 return -EINVAL;
1497
a174920d 1498 gpd_data = genpd_alloc_dev_data(dev);
3e235685
UH		 1499 if (IS_ERR(gpd_data))
1500 return PTR_ERR(gpd_data);
6ff7bb0d 1501
f9ccd7c3 1502 gpd_data->cpu = genpd_get_cpu(genpd, base_dev);
b24e1965 1503
b472c2fa
UH		 1504 ret = genpd->attach_dev ? genpd->attach_dev(genpd, dev) : 0;
1505 if (ret)
1506 goto out;
d79b6fe1 1507
2071ac98
JW		 1508 genpd_lock(genpd);
1509
f9ccd7c3 1510 genpd_set_cpumask(genpd, gpd_data->cpu);
975e83cf
SH		 1511 dev_pm_domain_set(dev, &genpd->domain);
1512
14b53064
UH		 1513 genpd->device_count++;
1514 genpd->max_off_time_changed = true;
1515
1d5fcfec 1516 list_add_tail(&gpd_data->base.list_node, &genpd->dev_list);
6ff7bb0d 1517
35241d12 1518 genpd_unlock(genpd);
2071ac98 1519 out:
c0356db7
UH		 1520 if (ret)
1521 genpd_free_dev_data(dev, gpd_data);
1522 else
0b07ee94
VK		 1523 dev_pm_qos_add_notifier(dev, &gpd_data->nb,
1524 DEV_PM_QOS_RESUME_LATENCY);
1d5fcfec 1525
f721889f
RW		 1526 return ret;
1527}
19efa5ff
JH		 1528
1529/**
1a7a6707 1530 * pm_genpd_add_device - Add a device to an I/O PM domain.
19efa5ff
JH		 1531 * @genpd: PM domain to add the device to.
1532 * @dev: Device to be added.
19efa5ff 1533 */
1a7a6707 1534int pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev)
19efa5ff
JH		 1535{
1536 int ret;
1537
1538 mutex_lock(&gpd_list_lock);
f9ccd7c3 1539 ret = genpd_add_device(genpd, dev, dev);
19efa5ff
JH		 1540 mutex_unlock(&gpd_list_lock);
1541
1542 return ret;
1543}
1a7a6707 1544EXPORT_SYMBOL_GPL(pm_genpd_add_device);
f721889f 1545
85168d56
UH		 1546static int genpd_remove_device(struct generic_pm_domain *genpd,
1547 struct device *dev)
f721889f 1548{
6ff7bb0d 1549 struct generic_pm_domain_data *gpd_data;
4605ab65 1550 struct pm_domain_data *pdd;
f9ccd7c3 1551 int ret = 0;
f721889f
RW		 1552
1553 dev_dbg(dev, "%s()\n", __func__);
1554
c0356db7
UH		 1555 pdd = dev->power.subsys_data->domain_data;
1556 gpd_data = to_gpd_data(pdd);
0b07ee94
VK		 1557 dev_pm_qos_remove_notifier(dev, &gpd_data->nb,
1558 DEV_PM_QOS_RESUME_LATENCY);
c0356db7 1559
35241d12 1560 genpd_lock(genpd);
f721889f 1561
596ba34b
RW		 1562 if (genpd->prepared_count > 0) {
1563 ret = -EAGAIN;
1564 goto out;
1565 }
1566
6ff7bb0d
RW		 1567 genpd->device_count--;
1568 genpd->max_off_time_changed = true;
1569
f9ccd7c3 1570 genpd_clear_cpumask(genpd, gpd_data->cpu);
975e83cf
SH		 1571 dev_pm_domain_set(dev, NULL);
1572
efa69025 1573 list_del_init(&pdd->list_node);
6ff7bb0d 1574
35241d12 1575 genpd_unlock(genpd);
6ff7bb0d 1576
2071ac98
JW		 1577 if (genpd->detach_dev)
1578 genpd->detach_dev(genpd, dev);
1579
c1dbe2fb 1580 genpd_free_dev_data(dev, gpd_data);
1d5fcfec 1581
6ff7bb0d 1582 return 0;
f721889f 1583
596ba34b 1584 out:
35241d12 1585 genpd_unlock(genpd);
0b07ee94 1586 dev_pm_qos_add_notifier(dev, &gpd_data->nb, DEV_PM_QOS_RESUME_LATENCY);
f721889f
RW		 1587
1588 return ret;
1589}
85168d56
UH		 1590
1591/**
1592 * pm_genpd_remove_device - Remove a device from an I/O PM domain.
85168d56
UH		 1593 * @dev: Device to be removed.
1594 */
924f4486 1595int pm_genpd_remove_device(struct device *dev)
85168d56 1596{
b3ad17c0 1597 struct generic_pm_domain *genpd = dev_to_genpd_safe(dev);
924f4486
UH		 1598
1599 if (!genpd)
85168d56
UH		 1600 return -EINVAL;
1601
1602 return genpd_remove_device(genpd, dev);
1603}
24c96dc7 1604EXPORT_SYMBOL_GPL(pm_genpd_remove_device);
f721889f 1605
19efa5ff
JH		 1606static int genpd_add_subdomain(struct generic_pm_domain *genpd,
1607 struct generic_pm_domain *subdomain)
f721889f 1608{
2547923d 1609 struct gpd_link *link, *itr;
f721889f
RW		 1610 int ret = 0;
1611
fb7268be
RW		 1612 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)
1613 || genpd == subdomain)
f721889f
RW		 1614 return -EINVAL;
1615
d716f479
LI		 1616 /*
1617 * If the domain can be powered on/off in an IRQ safe
1618 * context, ensure that the subdomain can also be
1619 * powered on/off in that context.
1620 */
1621 if (!genpd_is_irq_safe(genpd) && genpd_is_irq_safe(subdomain)) {
44cae7d5 1622 WARN(1, "Parent %s of subdomain %s must be IRQ safe\n",
d716f479
LI		 1623 genpd->name, subdomain->name);
1624 return -EINVAL;
1625 }
1626
2547923d
LI		 1627 link = kzalloc(sizeof(*link), GFP_KERNEL);
1628 if (!link)
1629 return -ENOMEM;
1630
35241d12
LI		 1631 genpd_lock(subdomain);
1632 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
f721889f 1633
41e2c8e0 1634 if (!genpd_status_on(genpd) && genpd_status_on(subdomain)) {
f721889f
RW		 1635 ret = -EINVAL;
1636 goto out;
1637 }
1638
2547923d
LI		 1639 list_for_each_entry(itr, &genpd->master_links, master_node) {
1640 if (itr->slave == subdomain && itr->master == genpd) {
f721889f
RW		 1641 ret = -EINVAL;
1642 goto out;
1643 }
1644 }
1645
5063ce15
RW		 1646 link->master = genpd;
1647 list_add_tail(&link->master_node, &genpd->master_links);
bc0403ff
RW		 1648 link->slave = subdomain;
1649 list_add_tail(&link->slave_node, &subdomain->slave_links);
41e2c8e0 1650 if (genpd_status_on(subdomain))
c4bb3160 1651 genpd_sd_counter_inc(genpd);
f721889f 1652
f721889f 1653 out:
35241d12
LI		 1654 genpd_unlock(genpd);
1655 genpd_unlock(subdomain);
2547923d
LI		 1656 if (ret)
1657 kfree(link);
f721889f
RW		 1658 return ret;
1659}
19efa5ff
JH		 1660
1661/**
1662 * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
1663 * @genpd: Master PM domain to add the subdomain to.
1664 * @subdomain: Subdomain to be added.
1665 */
1666int pm_genpd_add_subdomain(struct generic_pm_domain *genpd,
1667 struct generic_pm_domain *subdomain)
1668{
1669 int ret;
1670
1671 mutex_lock(&gpd_list_lock);
1672 ret = genpd_add_subdomain(genpd, subdomain);
1673 mutex_unlock(&gpd_list_lock);
1674
1675 return ret;
1676}
d60ee966 1677EXPORT_SYMBOL_GPL(pm_genpd_add_subdomain);
f721889f
RW		 1678
1679/**
1680 * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
1681 * @genpd: Master PM domain to remove the subdomain from.
5063ce15 1682 * @subdomain: Subdomain to be removed.
f721889f
RW		 1683 */
1684int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd,
5063ce15 1685 struct generic_pm_domain *subdomain)
f721889f 1686{
c6e83cac 1687 struct gpd_link *l, *link;
f721889f
RW		 1688 int ret = -EINVAL;
1689
5063ce15 1690 if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain))
f721889f
RW		 1691 return -EINVAL;
1692
35241d12
LI		 1693 genpd_lock(subdomain);
1694 genpd_lock_nested(genpd, SINGLE_DEPTH_NESTING);
f721889f 1695
beda5fc1 1696 if (!list_empty(&subdomain->master_links) || subdomain->device_count) {
7a5bd127
JP		 1697 pr_warn("%s: unable to remove subdomain %s\n",
1698 genpd->name, subdomain->name);
30e7a65b
JH		 1699 ret = -EBUSY;
1700 goto out;
1701 }
1702
c6e83cac 1703 list_for_each_entry_safe(link, l, &genpd->master_links, master_node) {
5063ce15 1704 if (link->slave != subdomain)
f721889f
RW		 1705 continue;
1706
5063ce15
RW		 1707 list_del(&link->master_node);
1708 list_del(&link->slave_node);
1709 kfree(link);
41e2c8e0 1710 if (genpd_status_on(subdomain))
f721889f
RW		 1711 genpd_sd_counter_dec(genpd);
1712
f721889f
RW		 1713 ret = 0;
1714 break;
1715 }
1716
30e7a65b 1717out:
35241d12
LI		 1718 genpd_unlock(genpd);
1719 genpd_unlock(subdomain);
f721889f
RW		 1720
1721 return ret;
1722}
d60ee966 1723EXPORT_SYMBOL_GPL(pm_genpd_remove_subdomain);
f721889f 1724
49a27e27
UH		 1725static void genpd_free_default_power_state(struct genpd_power_state *states,
1726 unsigned int state_count)
1727{
1728 kfree(states);
1729}
1730
59d65b73
LI		 1731static int genpd_set_default_power_state(struct generic_pm_domain *genpd)
1732{
1733 struct genpd_power_state *state;
1734
1735 state = kzalloc(sizeof(*state), GFP_KERNEL);
1736 if (!state)
1737 return -ENOMEM;
1738
1739 genpd->states = state;
1740 genpd->state_count = 1;
49a27e27 1741 genpd->free_states = genpd_free_default_power_state;
59d65b73
LI		 1742
1743 return 0;
1744}
1745
d716f479
LI		 1746static void genpd_lock_init(struct generic_pm_domain *genpd)
1747{
1748 if (genpd->flags & GENPD_FLAG_IRQ_SAFE) {
1749 spin_lock_init(&genpd->slock);
1750 genpd->lock_ops = &genpd_spin_ops;
1751 } else {
1752 mutex_init(&genpd->mlock);
1753 genpd->lock_ops = &genpd_mtx_ops;
1754 }
1755}
1756
f721889f
RW		 1757/**
1758 * pm_genpd_init - Initialize a generic I/O PM domain object.
1759 * @genpd: PM domain object to initialize.
1760 * @gov: PM domain governor to associate with the domain (may be NULL).
1761 * @is_off: Initial value of the domain's power_is_off field.
7eb231c3
UH		 1762 *
1763 * Returns 0 on successful initialization, else a negative error code.
f721889f 1764 */
7eb231c3
UH		 1765int pm_genpd_init(struct generic_pm_domain *genpd,
1766 struct dev_power_governor *gov, bool is_off)
f721889f 1767{
59d65b73
LI		 1768 int ret;
1769
f721889f 1770 if (IS_ERR_OR_NULL(genpd))
7eb231c3 1771 return -EINVAL;
f721889f 1772
5063ce15
RW		 1773 INIT_LIST_HEAD(&genpd->master_links);
1774 INIT_LIST_HEAD(&genpd->slave_links);
f721889f 1775 INIT_LIST_HEAD(&genpd->dev_list);
d716f479 1776 genpd_lock_init(genpd);
f721889f
RW		 1777 genpd->gov = gov;
1778 INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn);
c4bb3160 1779 atomic_set(&genpd->sd_count, 0);
17b75eca 1780 genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE;
596ba34b 1781 genpd->device_count = 0;
221e9b58 1782 genpd->max_off_time_ns = -1;
6ff7bb0d 1783 genpd->max_off_time_changed = true;
de0aa06d
JH		 1784 genpd->provider = NULL;
1785 genpd->has_provider = false;
afece3ab 1786 genpd->accounting_time = ktime_get();
795bd2e7
UH		 1787 genpd->domain.ops.runtime_suspend = genpd_runtime_suspend;
1788 genpd->domain.ops.runtime_resume = genpd_runtime_resume;
9e9704ea
UH		 1789 genpd->domain.ops.prepare = genpd_prepare;
1790 genpd->domain.ops.suspend_noirq = genpd_suspend_noirq;
1791 genpd->domain.ops.resume_noirq = genpd_resume_noirq;
1792 genpd->domain.ops.freeze_noirq = genpd_freeze_noirq;
1793 genpd->domain.ops.thaw_noirq = genpd_thaw_noirq;
1794 genpd->domain.ops.poweroff_noirq = genpd_poweroff_noirq;
1795 genpd->domain.ops.restore_noirq = genpd_restore_noirq;
1796 genpd->domain.ops.complete = genpd_complete;
ea71c596 1797 genpd->domain.start = genpd_dev_pm_start;
c11f6f5b
UH		 1798
1799 if (genpd->flags & GENPD_FLAG_PM_CLK) {
1800 genpd->dev_ops.stop = pm_clk_suspend;
1801 genpd->dev_ops.start = pm_clk_resume;
1802 }
1803
ffaa42e8 1804 /* Always-on domains must be powered on at initialization. */
ed61e18a
LC		 1805 if ((genpd_is_always_on(genpd) || genpd_is_rpm_always_on(genpd)) &&
1806 !genpd_status_on(genpd))
ffaa42e8
UH		 1807 return -EINVAL;
1808
eb594b73
UH		 1809 if (genpd_is_cpu_domain(genpd) &&
1810 !zalloc_cpumask_var(&genpd->cpus, GFP_KERNEL))
1811 return -ENOMEM;
1812
fc5cbf0c 1813 /* Use only one "off" state if there were no states declared */
59d65b73
LI		 1814 if (genpd->state_count == 0) {
1815 ret = genpd_set_default_power_state(genpd);
eb594b73
UH		 1816 if (ret) {
1817 if (genpd_is_cpu_domain(genpd))
1818 free_cpumask_var(genpd->cpus);
59d65b73 1819 return ret;
eb594b73 1820 }
46b7fe94 1821 } else if (!gov && genpd->state_count > 1) {
7a5bd127 1822 pr_warn("%s: no governor for states\n", genpd->name);
59d65b73 1823 }
fc5cbf0c 1824
401ea157
VK		 1825 device_initialize(&genpd->dev);
1826 dev_set_name(&genpd->dev, "%s", genpd->name);
1827
5125bbf3
RW		 1828 mutex_lock(&gpd_list_lock);
1829 list_add(&genpd->gpd_list_node, &gpd_list);
1830 mutex_unlock(&gpd_list_lock);
7eb231c3
UH		 1831
1832 return 0;
5125bbf3 1833}
be5ed55d 1834EXPORT_SYMBOL_GPL(pm_genpd_init);
aa42240a 1835
3fe57710
JH		 1836static int genpd_remove(struct generic_pm_domain *genpd)
1837{
1838 struct gpd_link *l, *link;
1839
1840 if (IS_ERR_OR_NULL(genpd))
1841 return -EINVAL;
1842
35241d12 1843 genpd_lock(genpd);
3fe57710
JH		 1844
1845 if (genpd->has_provider) {
35241d12 1846 genpd_unlock(genpd);
3fe57710
JH		 1847 pr_err("Provider present, unable to remove %s\n", genpd->name);
1848 return -EBUSY;
1849 }
1850
1851 if (!list_empty(&genpd->master_links) || genpd->device_count) {
35241d12 1852 genpd_unlock(genpd);
3fe57710
JH		 1853 pr_err("%s: unable to remove %s\n", __func__, genpd->name);
1854 return -EBUSY;
1855 }
1856
1857 list_for_each_entry_safe(link, l, &genpd->slave_links, slave_node) {
1858 list_del(&link->master_node);
1859 list_del(&link->slave_node);
1860 kfree(link);
1861 }
1862
1863 list_del(&genpd->gpd_list_node);
35241d12 1864 genpd_unlock(genpd);
3fe57710 1865 cancel_work_sync(&genpd->power_off_work);
eb594b73
UH		 1866 if (genpd_is_cpu_domain(genpd))
1867 free_cpumask_var(genpd->cpus);
49a27e27
UH		 1868 if (genpd->free_states)
1869 genpd->free_states(genpd->states, genpd->state_count);
1870
3fe57710
JH		 1871 pr_debug("%s: removed %s\n", __func__, genpd->name);
1872
1873 return 0;
1874}
1875
1876/**
1877 * pm_genpd_remove - Remove a generic I/O PM domain
1878 * @genpd: Pointer to PM domain that is to be removed.
1879 *
1880 * To remove the PM domain, this function:
1881 * - Removes the PM domain as a subdomain to any parent domains,
1882 * if it was added.
1883 * - Removes the PM domain from the list of registered PM domains.
1884 *
1885 * The PM domain will only be removed, if the associated provider has
1886 * been removed, it is not a parent to any other PM domain and has no
1887 * devices associated with it.
1888 */
1889int pm_genpd_remove(struct generic_pm_domain *genpd)
1890{
1891 int ret;
1892
1893 mutex_lock(&gpd_list_lock);
1894 ret = genpd_remove(genpd);
1895 mutex_unlock(&gpd_list_lock);
1896
1897 return ret;
1898}
1899EXPORT_SYMBOL_GPL(pm_genpd_remove);
1900
aa42240a 1901#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
892ebdcc 1902
aa42240a
TF		 1903/*
1904 * Device Tree based PM domain providers.
1905 *
1906 * The code below implements generic device tree based PM domain providers that
1907 * bind device tree nodes with generic PM domains registered in the system.
1908 *
1909 * Any driver that registers generic PM domains and needs to support binding of
1910 * devices to these domains is supposed to register a PM domain provider, which
1911 * maps a PM domain specifier retrieved from the device tree to a PM domain.
1912 *
1913 * Two simple mapping functions have been provided for convenience:
892ebdcc
JH		 1914 * - genpd_xlate_simple() for 1:1 device tree node to PM domain mapping.
1915 * - genpd_xlate_onecell() for mapping of multiple PM domains per node by
aa42240a
TF		 1916 * index.
1917 */
1918
1919/**
1920 * struct of_genpd_provider - PM domain provider registration structure
1921 * @link: Entry in global list of PM domain providers
1922 * @node: Pointer to device tree node of PM domain provider
1923 * @xlate: Provider-specific xlate callback mapping a set of specifier cells
1924 * into a PM domain.
1925 * @data: context pointer to be passed into @xlate callback
1926 */
1927struct of_genpd_provider {
1928 struct list_head link;
1929 struct device_node *node;
1930 genpd_xlate_t xlate;
1931 void *data;
1932};
1933
1934/* List of registered PM domain providers. */
1935static LIST_HEAD(of_genpd_providers);
1936/* Mutex to protect the list above. */
1937static DEFINE_MUTEX(of_genpd_mutex);
1938
1939/**
892ebdcc 1940 * genpd_xlate_simple() - Xlate function for direct node-domain mapping
aa42240a
TF		 1941 * @genpdspec: OF phandle args to map into a PM domain
1942 * @data: xlate function private data - pointer to struct generic_pm_domain
1943 *
1944 * This is a generic xlate function that can be used to model PM domains that
1945 * have their own device tree nodes. The private data of xlate function needs
1946 * to be a valid pointer to struct generic_pm_domain.
1947 */
892ebdcc 1948static struct generic_pm_domain *genpd_xlate_simple(
aa42240a
TF		 1949 struct of_phandle_args *genpdspec,
1950 void *data)
1951{
aa42240a
TF		 1952 return data;
1953}
aa42240a
TF		 1954
1955/**
892ebdcc 1956 * genpd_xlate_onecell() - Xlate function using a single index.
aa42240a
TF		 1957 * @genpdspec: OF phandle args to map into a PM domain
1958 * @data: xlate function private data - pointer to struct genpd_onecell_data
1959 *
1960 * This is a generic xlate function that can be used to model simple PM domain
1961 * controllers that have one device tree node and provide multiple PM domains.
1962 * A single cell is used as an index into an array of PM domains specified in
1963 * the genpd_onecell_data struct when registering the provider.
1964 */
892ebdcc 1965static struct generic_pm_domain *genpd_xlate_onecell(
aa42240a
TF		 1966 struct of_phandle_args *genpdspec,
1967 void *data)
1968{
1969 struct genpd_onecell_data *genpd_data = data;
1970 unsigned int idx = genpdspec->args[0];
1971
1972 if (genpdspec->args_count != 1)
1973 return ERR_PTR(-EINVAL);
1974
1975 if (idx >= genpd_data->num_domains) {
1976 pr_err("%s: invalid domain index %u\n", __func__, idx);
1977 return ERR_PTR(-EINVAL);
1978 }
1979
1980 if (!genpd_data->domains[idx])
1981 return ERR_PTR(-ENOENT);
1982
1983 return genpd_data->domains[idx];
1984}
aa42240a
TF		 1985
1986/**
892ebdcc 1987 * genpd_add_provider() - Register a PM domain provider for a node
aa42240a
TF		 1988 * @np: Device node pointer associated with the PM domain provider.
1989 * @xlate: Callback for decoding PM domain from phandle arguments.
1990 * @data: Context pointer for @xlate callback.
1991 */
892ebdcc
JH		 1992static int genpd_add_provider(struct device_node *np, genpd_xlate_t xlate,
1993 void *data)
aa42240a
TF		 1994{
1995 struct of_genpd_provider *cp;
1996
1997 cp = kzalloc(sizeof(*cp), GFP_KERNEL);
1998 if (!cp)
1999 return -ENOMEM;
2000
2001 cp->node = of_node_get(np);
2002 cp->data = data;
2003 cp->xlate = xlate;
2004
2005 mutex_lock(&of_genpd_mutex);
2006 list_add(&cp->link, &of_genpd_providers);
2007 mutex_unlock(&of_genpd_mutex);
ea11e94b 2008 pr_debug("Added domain provider from %pOF\n", np);
aa42240a
TF		 2009
2010 return 0;
2011}
892ebdcc 2012
fe0c2baa
UH		 2013static bool genpd_present(const struct generic_pm_domain *genpd)
2014{
2015 const struct generic_pm_domain *gpd;
2016
2017 list_for_each_entry(gpd, &gpd_list, gpd_list_node)
2018 if (gpd == genpd)
2019 return true;
2020 return false;
2021}
2022
892ebdcc
JH		 2023/**
2024 * of_genpd_add_provider_simple() - Register a simple PM domain provider
2025 * @np: Device node pointer associated with the PM domain provider.
2026 * @genpd: Pointer to PM domain associated with the PM domain provider.
2027 */
2028int of_genpd_add_provider_simple(struct device_node *np,
2029 struct generic_pm_domain *genpd)
2030{
0159ec67
JH		 2031 int ret = -EINVAL;
2032
2033 if (!np || !genpd)
2034 return -EINVAL;
2035
2036 mutex_lock(&gpd_list_lock);
2037
6a0ae73d
VK		 2038 if (!genpd_present(genpd))
2039 goto unlock;
2040
2041 genpd->dev.of_node = np;
2042
2043 /* Parse genpd OPP table */
2044 if (genpd->set_performance_state) {
2045 ret = dev_pm_opp_of_add_table(&genpd->dev);
2046 if (ret) {
2047 dev_err(&genpd->dev, "Failed to add OPP table: %d\n",
2048 ret);
2049 goto unlock;
8ce95844 2050 }
1067ae3e
VK		 2051
2052 /*
2053 * Save table for faster processing while setting performance
2054 * state.
2055 */
2056 genpd->opp_table = dev_pm_opp_get_opp_table(&genpd->dev);
2057 WARN_ON(!genpd->opp_table);
de0aa06d
JH		 2058 }
2059
6a0ae73d
VK		 2060 ret = genpd_add_provider(np, genpd_xlate_simple, genpd);
2061 if (ret) {
1067ae3e
VK		 2062 if (genpd->set_performance_state) {
2063 dev_pm_opp_put_opp_table(genpd->opp_table);
6a0ae73d 2064 dev_pm_opp_of_remove_table(&genpd->dev);
1067ae3e 2065 }
6a0ae73d
VK		 2066
2067 goto unlock;
2068 }
2069
2070 genpd->provider = &np->fwnode;
2071 genpd->has_provider = true;
2072
2073unlock:
0159ec67
JH		 2074 mutex_unlock(&gpd_list_lock);
2075
2076 return ret;
892ebdcc
JH		 2077}
2078EXPORT_SYMBOL_GPL(of_genpd_add_provider_simple);
2079
2080/**
2081 * of_genpd_add_provider_onecell() - Register a onecell PM domain provider
2082 * @np: Device node pointer associated with the PM domain provider.
2083 * @data: Pointer to the data associated with the PM domain provider.
2084 */
2085int of_genpd_add_provider_onecell(struct device_node *np,
2086 struct genpd_onecell_data *data)
2087{
6a0ae73d 2088 struct generic_pm_domain *genpd;
0159ec67 2089 unsigned int i;
de0aa06d 2090 int ret = -EINVAL;
0159ec67
JH		 2091
2092 if (!np || !data)
2093 return -EINVAL;
2094
2095 mutex_lock(&gpd_list_lock);
2096
40845524
TR		 2097 if (!data->xlate)
2098 data->xlate = genpd_xlate_onecell;
2099
0159ec67 2100 for (i = 0; i < data->num_domains; i++) {
6a0ae73d
VK		 2101 genpd = data->domains[i];
2102
2103 if (!genpd)
609bed67 2104 continue;
6a0ae73d 2105 if (!genpd_present(genpd))
de0aa06d
JH		 2106 goto error;
2107
6a0ae73d
VK		 2108 genpd->dev.of_node = np;
2109
2110 /* Parse genpd OPP table */
2111 if (genpd->set_performance_state) {
2112 ret = dev_pm_opp_of_add_table_indexed(&genpd->dev, i);
2113 if (ret) {
2114 dev_err(&genpd->dev, "Failed to add OPP table for index %d: %d\n",
2115 i, ret);
2116 goto error;
2117 }
1067ae3e
VK		 2118
2119 /*
2120 * Save table for faster processing while setting
2121 * performance state.
2122 */
2123 genpd->opp_table = dev_pm_opp_get_opp_table_indexed(&genpd->dev, i);
2124 WARN_ON(!genpd->opp_table);
6a0ae73d
VK		 2125 }
2126
2127 genpd->provider = &np->fwnode;
2128 genpd->has_provider = true;
0159ec67
JH		 2129 }
2130
40845524 2131 ret = genpd_add_provider(np, data->xlate, data);
de0aa06d
JH		 2132 if (ret < 0)
2133 goto error;
2134
2135 mutex_unlock(&gpd_list_lock);
2136
2137 return 0;
2138
2139error:
2140 while (i--) {
6a0ae73d
VK		 2141 genpd = data->domains[i];
2142
2143 if (!genpd)
609bed67 2144 continue;
6a0ae73d
VK		 2145
2146 genpd->provider = NULL;
2147 genpd->has_provider = false;
2148
1067ae3e
VK		 2149 if (genpd->set_performance_state) {
2150 dev_pm_opp_put_opp_table(genpd->opp_table);
6a0ae73d 2151 dev_pm_opp_of_remove_table(&genpd->dev);
1067ae3e 2152 }
de0aa06d 2153 }
0159ec67
JH		 2154
2155 mutex_unlock(&gpd_list_lock);
2156
2157 return ret;
892ebdcc
JH		 2158}
2159EXPORT_SYMBOL_GPL(of_genpd_add_provider_onecell);
aa42240a
TF		 2160
2161/**
2162 * of_genpd_del_provider() - Remove a previously registered PM domain provider
2163 * @np: Device node pointer associated with the PM domain provider
2164 */
2165void of_genpd_del_provider(struct device_node *np)
2166{
b556b15d 2167 struct of_genpd_provider *cp, *tmp;
de0aa06d 2168 struct generic_pm_domain *gpd;
aa42240a 2169
de0aa06d 2170 mutex_lock(&gpd_list_lock);
aa42240a 2171 mutex_lock(&of_genpd_mutex);
b556b15d 2172 list_for_each_entry_safe(cp, tmp, &of_genpd_providers, link) {
aa42240a 2173 if (cp->node == np) {
de0aa06d
JH		 2174 /*
2175 * For each PM domain associated with the
2176 * provider, set the 'has_provider' to false
2177 * so that the PM domain can be safely removed.
2178 */
6a0ae73d
VK		 2179 list_for_each_entry(gpd, &gpd_list, gpd_list_node) {
2180 if (gpd->provider == &np->fwnode) {
de0aa06d
JH		 2181 gpd->has_provider = false;
2182
6a0ae73d
VK		 2183 if (!gpd->set_performance_state)
2184 continue;
2185
1067ae3e 2186 dev_pm_opp_put_opp_table(gpd->opp_table);
6a0ae73d
VK		 2187 dev_pm_opp_of_remove_table(&gpd->dev);
2188 }
2189 }
2190
aa42240a
TF		 2191 list_del(&cp->link);
2192 of_node_put(cp->node);
2193 kfree(cp);
2194 break;
2195 }
2196 }
2197 mutex_unlock(&of_genpd_mutex);
de0aa06d 2198 mutex_unlock(&gpd_list_lock);
aa42240a
TF		 2199}
2200EXPORT_SYMBOL_GPL(of_genpd_del_provider);
2201
2202/**
f58d4e5a 2203 * genpd_get_from_provider() - Look-up PM domain
aa42240a
TF		 2204 * @genpdspec: OF phandle args to use for look-up
2205 *
2206 * Looks for a PM domain provider under the node specified by @genpdspec and if
2207 * found, uses xlate function of the provider to map phandle args to a PM
2208 * domain.
2209 *
2210 * Returns a valid pointer to struct generic_pm_domain on success or ERR_PTR()
2211 * on failure.
2212 */
f58d4e5a 2213static struct generic_pm_domain *genpd_get_from_provider(
aa42240a
TF		 2214 struct of_phandle_args *genpdspec)
2215{
2216 struct generic_pm_domain *genpd = ERR_PTR(-ENOENT);
2217 struct of_genpd_provider *provider;
2218
41795a8a
JH		 2219 if (!genpdspec)
2220 return ERR_PTR(-EINVAL);
2221
aa42240a
TF		 2222 mutex_lock(&of_genpd_mutex);
2223
2224 /* Check if we have such a provider in our array */
2225 list_for_each_entry(provider, &of_genpd_providers, link) {
2226 if (provider->node == genpdspec->np)
2227 genpd = provider->xlate(genpdspec, provider->data);
2228 if (!IS_ERR(genpd))
2229 break;
2230 }
2231
2232 mutex_unlock(&of_genpd_mutex);
2233
2234 return genpd;
2235}
2236
ec69572b
JH		 2237/**
2238 * of_genpd_add_device() - Add a device to an I/O PM domain
2239 * @genpdspec: OF phandle args to use for look-up PM domain
2240 * @dev: Device to be added.
2241 *
2242 * Looks-up an I/O PM domain based upon phandle args provided and adds
2243 * the device to the PM domain. Returns a negative error code on failure.
2244 */
2245int of_genpd_add_device(struct of_phandle_args *genpdspec, struct device *dev)
2246{
2247 struct generic_pm_domain *genpd;
19efa5ff
JH		 2248 int ret;
2249
2250 mutex_lock(&gpd_list_lock);
ec69572b 2251
f58d4e5a 2252 genpd = genpd_get_from_provider(genpdspec);
19efa5ff
JH		 2253 if (IS_ERR(genpd)) {
2254 ret = PTR_ERR(genpd);
2255 goto out;
2256 }
2257
f9ccd7c3 2258 ret = genpd_add_device(genpd, dev, dev);
ec69572b 2259
19efa5ff
JH		 2260out:
2261 mutex_unlock(&gpd_list_lock);
2262
2263 return ret;
ec69572b
JH		 2264}
2265EXPORT_SYMBOL_GPL(of_genpd_add_device);
2266
2267/**
2268 * of_genpd_add_subdomain - Add a subdomain to an I/O PM domain.
2269 * @parent_spec: OF phandle args to use for parent PM domain look-up
2270 * @subdomain_spec: OF phandle args to use for subdomain look-up
2271 *
2272 * Looks-up a parent PM domain and subdomain based upon phandle args
2273 * provided and adds the subdomain to the parent PM domain. Returns a
2274 * negative error code on failure.
2275 */
2276int of_genpd_add_subdomain(struct of_phandle_args *parent_spec,
2277 struct of_phandle_args *subdomain_spec)
2278{
2279 struct generic_pm_domain *parent, *subdomain;
19efa5ff
JH		 2280 int ret;
2281
2282 mutex_lock(&gpd_list_lock);
ec69572b 2283
f58d4e5a 2284 parent = genpd_get_from_provider(parent_spec);
19efa5ff
JH		 2285 if (IS_ERR(parent)) {
2286 ret = PTR_ERR(parent);
2287 goto out;
2288 }
ec69572b 2289
f58d4e5a 2290 subdomain = genpd_get_from_provider(subdomain_spec);
19efa5ff
JH		 2291 if (IS_ERR(subdomain)) {
2292 ret = PTR_ERR(subdomain);
2293 goto out;
2294 }
2295
2296 ret = genpd_add_subdomain(parent, subdomain);
ec69572b 2297
19efa5ff
JH		 2298out:
2299 mutex_unlock(&gpd_list_lock);
2300
2301 return ret;
ec69572b
JH		 2302}
2303EXPORT_SYMBOL_GPL(of_genpd_add_subdomain);
2304
dedd1492
UH		 2305/**
2306 * of_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain.
2307 * @parent_spec: OF phandle args to use for parent PM domain look-up
2308 * @subdomain_spec: OF phandle args to use for subdomain look-up
2309 *
2310 * Looks-up a parent PM domain and subdomain based upon phandle args
2311 * provided and removes the subdomain from the parent PM domain. Returns a
2312 * negative error code on failure.
2313 */
2314int of_genpd_remove_subdomain(struct of_phandle_args *parent_spec,
2315 struct of_phandle_args *subdomain_spec)
2316{
2317 struct generic_pm_domain *parent, *subdomain;
2318 int ret;
2319
2320 mutex_lock(&gpd_list_lock);
2321
2322 parent = genpd_get_from_provider(parent_spec);
2323 if (IS_ERR(parent)) {
2324 ret = PTR_ERR(parent);
2325 goto out;
2326 }
2327
2328 subdomain = genpd_get_from_provider(subdomain_spec);
2329 if (IS_ERR(subdomain)) {
2330 ret = PTR_ERR(subdomain);
2331 goto out;
2332 }
2333
2334 ret = pm_genpd_remove_subdomain(parent, subdomain);
2335
2336out:
2337 mutex_unlock(&gpd_list_lock);
2338
2339 return ret;
2340}
2341EXPORT_SYMBOL_GPL(of_genpd_remove_subdomain);
2342
17926551
JH		 2343/**
2344 * of_genpd_remove_last - Remove the last PM domain registered for a provider
2345 * @provider: Pointer to device structure associated with provider
2346 *
2347 * Find the last PM domain that was added by a particular provider and
2348 * remove this PM domain from the list of PM domains. The provider is
2349 * identified by the 'provider' device structure that is passed. The PM
2350 * domain will only be removed, if the provider associated with domain
2351 * has been removed.
2352 *
2353 * Returns a valid pointer to struct generic_pm_domain on success or
2354 * ERR_PTR() on failure.
2355 */
2356struct generic_pm_domain *of_genpd_remove_last(struct device_node *np)
2357{
a7e2d1bc 2358 struct generic_pm_domain *gpd, *tmp, *genpd = ERR_PTR(-ENOENT);
17926551
JH		 2359 int ret;
2360
2361 if (IS_ERR_OR_NULL(np))
2362 return ERR_PTR(-EINVAL);
2363
2364 mutex_lock(&gpd_list_lock);
a7e2d1bc 2365 list_for_each_entry_safe(gpd, tmp, &gpd_list, gpd_list_node) {
17926551
JH		 2366 if (gpd->provider == &np->fwnode) {
2367 ret = genpd_remove(gpd);
2368 genpd = ret ? ERR_PTR(ret) : gpd;
2369 break;
2370 }
2371 }
2372 mutex_unlock(&gpd_list_lock);
2373
2374 return genpd;
2375}
2376EXPORT_SYMBOL_GPL(of_genpd_remove_last);
2377
3c095f32
UH		 2378static void genpd_release_dev(struct device *dev)
2379{
e8b04de9 2380 of_node_put(dev->of_node);
3c095f32
UH		 2381 kfree(dev);
2382}
2383
2384static struct bus_type genpd_bus_type = {
2385 .name = "genpd",
2386};
2387
aa42240a
TF		 2388/**
2389 * genpd_dev_pm_detach - Detach a device from its PM domain.
8bb6944e 2390 * @dev: Device to detach.
aa42240a
TF		 2391 * @power_off: Currently not used
2392 *
2393 * Try to locate a corresponding generic PM domain, which the device was
2394 * attached to previously. If such is found, the device is detached from it.
2395 */
2396static void genpd_dev_pm_detach(struct device *dev, bool power_off)
2397{
446d999c 2398 struct generic_pm_domain *pd;
93af5e93 2399 unsigned int i;
aa42240a
TF		 2400 int ret = 0;
2401
85168d56
UH		 2402 pd = dev_to_genpd(dev);
2403 if (IS_ERR(pd))
aa42240a
TF		 2404 return;
2405
2406 dev_dbg(dev, "removing from PM domain %s\n", pd->name);
2407
93af5e93 2408 for (i = 1; i < GENPD_RETRY_MAX_MS; i <<= 1) {
85168d56 2409 ret = genpd_remove_device(pd, dev);
aa42240a
TF		 2410 if (ret != -EAGAIN)
2411 break;
93af5e93
GU		 2412
2413 mdelay(i);
aa42240a
TF		 2414 cond_resched();
2415 }
2416
2417 if (ret < 0) {
2418 dev_err(dev, "failed to remove from PM domain %s: %d",
2419 pd->name, ret);
2420 return;
2421 }
2422
2423 /* Check if PM domain can be powered off after removing this device. */
2424 genpd_queue_power_off_work(pd);
3c095f32
UH		 2425
2426 /* Unregister the device if it was created by genpd. */
2427 if (dev->bus == &genpd_bus_type)
2428 device_unregister(dev);
aa42240a
TF		 2429}
2430
632f7ce3
RK		 2431static void genpd_dev_pm_sync(struct device *dev)
2432{
2433 struct generic_pm_domain *pd;
2434
2435 pd = dev_to_genpd(dev);
2436 if (IS_ERR(pd))
2437 return;
2438
2439 genpd_queue_power_off_work(pd);
2440}
2441
51dcf748
UH		 2442static int __genpd_dev_pm_attach(struct device *dev, struct device *base_dev,
2443 unsigned int index, bool power_on)
aa42240a
TF		 2444{
2445 struct of_phandle_args pd_args;
2446 struct generic_pm_domain *pd;
2447 int ret;
2448
e8b04de9 2449 ret = of_parse_phandle_with_args(dev->of_node, "power-domains",
8cb1cbd6 2450 "#power-domain-cells", index, &pd_args);
001d50c9 2451 if (ret < 0)
bcd931f2 2452 return ret;
aa42240a 2453
19efa5ff 2454 mutex_lock(&gpd_list_lock);
f58d4e5a 2455 pd = genpd_get_from_provider(&pd_args);
265e2cf6 2456 of_node_put(pd_args.np);
aa42240a 2457 if (IS_ERR(pd)) {
19efa5ff 2458 mutex_unlock(&gpd_list_lock);
aa42240a
TF		 2459 dev_dbg(dev, "%s() failed to find PM domain: %ld\n",
2460 __func__, PTR_ERR(pd));
51dcf748 2461 return driver_deferred_probe_check_state(base_dev);
aa42240a
TF		 2462 }
2463
2464 dev_dbg(dev, "adding to PM domain %s\n", pd->name);
2465
f9ccd7c3 2466 ret = genpd_add_device(pd, dev, base_dev);
19efa5ff 2467 mutex_unlock(&gpd_list_lock);
aa42240a
TF		 2468
2469 if (ret < 0) {
34994692
GU		 2470 if (ret != -EPROBE_DEFER)
2471 dev_err(dev, "failed to add to PM domain %s: %d",
2472 pd->name, ret);
919b7308 2473 return ret;
aa42240a
TF		 2474 }
2475
2476 dev->pm_domain->detach = genpd_dev_pm_detach;
632f7ce3 2477 dev->pm_domain->sync = genpd_dev_pm_sync;
aa42240a 2478
895b6612
UH		 2479 if (power_on) {
2480 genpd_lock(pd);
2481 ret = genpd_power_on(pd, 0);
2482 genpd_unlock(pd);
2483 }
72038df3
UH		 2484
2485 if (ret)
2486 genpd_remove_device(pd, dev);
919b7308
UH		 2487
2488 return ret ? -EPROBE_DEFER : 1;
aa42240a 2489}
8cb1cbd6
UH		 2490
2491/**
2492 * genpd_dev_pm_attach - Attach a device to its PM domain using DT.
2493 * @dev: Device to attach.
2494 *
2495 * Parse device's OF node to find a PM domain specifier. If such is found,
2496 * attaches the device to retrieved pm_domain ops.
2497 *
2498 * Returns 1 on successfully attached PM domain, 0 when the device don't need a
2499 * PM domain or when multiple power-domains exists for it, else a negative error
2500 * code. Note that if a power-domain exists for the device, but it cannot be
2501 * found or turned on, then return -EPROBE_DEFER to ensure that the device is
2502 * not probed and to re-try again later.
2503 */
2504int genpd_dev_pm_attach(struct device *dev)
2505{
2506 if (!dev->of_node)
2507 return 0;
2508
2509 /*
2510 * Devices with multiple PM domains must be attached separately, as we
2511 * can only attach one PM domain per device.
2512 */
2513 if (of_count_phandle_with_args(dev->of_node, "power-domains",
2514 "#power-domain-cells") != 1)
2515 return 0;
2516
51dcf748 2517 return __genpd_dev_pm_attach(dev, dev, 0, true);
8cb1cbd6 2518}
aa42240a 2519EXPORT_SYMBOL_GPL(genpd_dev_pm_attach);
30f60428 2520
3c095f32
UH		 2521/**
2522 * genpd_dev_pm_attach_by_id - Associate a device with one of its PM domains.
2523 * @dev: The device used to lookup the PM domain.
2524 * @index: The index of the PM domain.
2525 *
2526 * Parse device's OF node to find a PM domain specifier at the provided @index.
2527 * If such is found, creates a virtual device and attaches it to the retrieved
2528 * pm_domain ops. To deal with detaching of the virtual device, the ->detach()
2529 * callback in the struct dev_pm_domain are assigned to genpd_dev_pm_detach().
2530 *
2531 * Returns the created virtual device if successfully attached PM domain, NULL
2532 * when the device don't need a PM domain, else an ERR_PTR() in case of
2533 * failures. If a power-domain exists for the device, but cannot be found or
2534 * turned on, then ERR_PTR(-EPROBE_DEFER) is returned to ensure that the device
2535 * is not probed and to re-try again later.
2536 */
2537struct device *genpd_dev_pm_attach_by_id(struct device *dev,
2538 unsigned int index)
2539{
560928b2 2540 struct device *virt_dev;
3c095f32
UH		 2541 int num_domains;
2542 int ret;
2543
2544 if (!dev->of_node)
2545 return NULL;
2546
3ccf3f0c 2547 /* Verify that the index is within a valid range. */
3c095f32
UH		 2548 num_domains = of_count_phandle_with_args(dev->of_node, "power-domains",
2549 "#power-domain-cells");
3ccf3f0c 2550 if (index >= num_domains)
3c095f32
UH		 2551 return NULL;
2552
2553 /* Allocate and register device on the genpd bus. */
560928b2
VK		 2554 virt_dev = kzalloc(sizeof(*virt_dev), GFP_KERNEL);
2555 if (!virt_dev)
3c095f32
UH		 2556 return ERR_PTR(-ENOMEM);
2557
560928b2
VK		 2558 dev_set_name(virt_dev, "genpd:%u:%s", index, dev_name(dev));
2559 virt_dev->bus = &genpd_bus_type;
2560 virt_dev->release = genpd_release_dev;
e8b04de9 2561 virt_dev->of_node = of_node_get(dev->of_node);
3c095f32 2562
560928b2 2563 ret = device_register(virt_dev);
3c095f32 2564 if (ret) {
71b77697 2565 put_device(virt_dev);
3c095f32
UH		 2566 return ERR_PTR(ret);
2567 }
2568
2569 /* Try to attach the device to the PM domain at the specified index. */
51dcf748 2570 ret = __genpd_dev_pm_attach(virt_dev, dev, index, false);
3c095f32 2571 if (ret < 1) {
560928b2 2572 device_unregister(virt_dev);
3c095f32
UH		 2573 return ret ? ERR_PTR(ret) : NULL;
2574 }
2575
560928b2
VK		 2576 pm_runtime_enable(virt_dev);
2577 genpd_queue_power_off_work(dev_to_genpd(virt_dev));
3c095f32 2578
560928b2 2579 return virt_dev;
3c095f32
UH		 2580}
2581EXPORT_SYMBOL_GPL(genpd_dev_pm_attach_by_id);
2582
5d6be70a
UH		 2583/**
2584 * genpd_dev_pm_attach_by_name - Associate a device with one of its PM domains.
2585 * @dev: The device used to lookup the PM domain.
2586 * @name: The name of the PM domain.
2587 *
2588 * Parse device's OF node to find a PM domain specifier using the
2589 * power-domain-names DT property. For further description see
2590 * genpd_dev_pm_attach_by_id().
2591 */
7416f1f2 2592struct device *genpd_dev_pm_attach_by_name(struct device *dev, const char *name)
5d6be70a
UH		 2593{
2594 int index;
2595
2596 if (!dev->of_node)
2597 return NULL;
2598
2599 index = of_property_match_string(dev->of_node, "power-domain-names",
2600 name);
2601 if (index < 0)
2602 return NULL;
2603
2604 return genpd_dev_pm_attach_by_id(dev, index);
2605}
2606
30f60428 2607static const struct of_device_id idle_state_match[] = {
598da548 2608 { .compatible = "domain-idle-state", },
30f60428
LI		 2609 { }
2610};
2611
2612static int genpd_parse_state(struct genpd_power_state *genpd_state,
2613 struct device_node *state_node)
2614{
2615 int err;
2616 u32 residency;
2617 u32 entry_latency, exit_latency;
30f60428
LI		 2618
2619 err = of_property_read_u32(state_node, "entry-latency-us",
2620 &entry_latency);
2621 if (err) {
ea11e94b 2622 pr_debug(" * %pOF missing entry-latency-us property\n",
7a5bd127 2623 state_node);
30f60428
LI		 2624 return -EINVAL;
2625 }
2626
2627 err = of_property_read_u32(state_node, "exit-latency-us",
2628 &exit_latency);
2629 if (err) {
ea11e94b 2630 pr_debug(" * %pOF missing exit-latency-us property\n",
7a5bd127 2631 state_node);
30f60428
LI		 2632 return -EINVAL;
2633 }
2634
2635 err = of_property_read_u32(state_node, "min-residency-us", &residency);
2636 if (!err)
2637 genpd_state->residency_ns = 1000 * residency;
2638
2639 genpd_state->power_on_latency_ns = 1000 * exit_latency;
2640 genpd_state->power_off_latency_ns = 1000 * entry_latency;
0c9b694a 2641 genpd_state->fwnode = &state_node->fwnode;
30f60428
LI		 2642
2643 return 0;
2644}
2645
a3381e3a
UH		 2646static int genpd_iterate_idle_states(struct device_node *dn,
2647 struct genpd_power_state *states)
2648{
2649 int ret;
2650 struct of_phandle_iterator it;
2651 struct device_node *np;
2652 int i = 0;
2653
2654 ret = of_count_phandle_with_args(dn, "domain-idle-states", NULL);
2655 if (ret <= 0)
2656 return ret;
2657
2658 /* Loop over the phandles until all the requested entry is found */
2659 of_for_each_phandle(&it, ret, dn, "domain-idle-states", NULL, 0) {
2660 np = it.node;
2661 if (!of_match_node(idle_state_match, np))
2662 continue;
2663 if (states) {
2664 ret = genpd_parse_state(&states[i], np);
2665 if (ret) {
2666 pr_err("Parsing idle state node %pOF failed with err %d\n",
2667 np, ret);
2668 of_node_put(np);
2669 return ret;
2670 }
2671 }
2672 i++;
2673 }
2674
2675 return i;
2676}
2677
30f60428
LI		 2678/**
2679 * of_genpd_parse_idle_states: Return array of idle states for the genpd.
2680 *
2681 * @dn: The genpd device node
2682 * @states: The pointer to which the state array will be saved.
2683 * @n: The count of elements in the array returned from this function.
2684 *
2685 * Returns the device states parsed from the OF node. The memory for the states
2686 * is allocated by this function and is the responsibility of the caller to
2c361684
UH		 2687 * free the memory after use. If any or zero compatible domain idle states is
2688 * found it returns 0 and in case of errors, a negative error code is returned.
30f60428
LI		 2689 */
2690int of_genpd_parse_idle_states(struct device_node *dn,
2691 struct genpd_power_state **states, int *n)
2692{
2693 struct genpd_power_state *st;
a3381e3a 2694 int ret;
30f60428 2695
a3381e3a 2696 ret = genpd_iterate_idle_states(dn, NULL);
2c361684
UH		 2697 if (ret < 0)
2698 return ret;
2699
2700 if (!ret) {
2701 *states = NULL;
2702 *n = 0;
2703 return 0;
2704 }
30f60428 2705
a3381e3a 2706 st = kcalloc(ret, sizeof(*st), GFP_KERNEL);
30f60428
LI		 2707 if (!st)
2708 return -ENOMEM;
2709
a3381e3a
UH		 2710 ret = genpd_iterate_idle_states(dn, st);
2711 if (ret <= 0) {
2712 kfree(st);
2713 return ret < 0 ? ret : -EINVAL;
30f60428
LI		 2714 }
2715
a3381e3a
UH		 2716 *states = st;
2717 *n = ret;
30f60428
LI		 2718
2719 return 0;
2720}
2721EXPORT_SYMBOL_GPL(of_genpd_parse_idle_states);
2722
e38f89d3
VK		 2723/**
2724 * pm_genpd_opp_to_performance_state - Gets performance state of the genpd from its OPP node.
2725 *
2726 * @genpd_dev: Genpd's device for which the performance-state needs to be found.
2727 * @opp: struct dev_pm_opp of the OPP for which we need to find performance
2728 * state.
2729 *
2730 * Returns performance state encoded in the OPP of the genpd. This calls
2731 * platform specific genpd->opp_to_performance_state() callback to translate
2732 * power domain OPP to performance state.
2733 *
2734 * Returns performance state on success and 0 on failure.
2735 */
2736unsigned int pm_genpd_opp_to_performance_state(struct device *genpd_dev,
2737 struct dev_pm_opp *opp)
2738{
2739 struct generic_pm_domain *genpd = NULL;
2740 int state;
2741
2742 genpd = container_of(genpd_dev, struct generic_pm_domain, dev);
2743
2744 if (unlikely(!genpd->opp_to_performance_state))
2745 return 0;
2746
2747 genpd_lock(genpd);
2748 state = genpd->opp_to_performance_state(genpd, opp);
2749 genpd_unlock(genpd);
2750
2751 return state;
2752}
2753EXPORT_SYMBOL_GPL(pm_genpd_opp_to_performance_state);
2754
3c095f32
UH		 2755static int __init genpd_bus_init(void)
2756{
2757 return bus_register(&genpd_bus_type);
2758}
2759core_initcall(genpd_bus_init);
2760
d30d819d 2761#endif /* CONFIG_PM_GENERIC_DOMAINS_OF */
2bd5306a
MM		 2762
2763
2764/*** debugfs support ***/
2765
8b0510b5 2766#ifdef CONFIG_DEBUG_FS
2bd5306a
MM		 2767#include <linux/pm.h>
2768#include <linux/device.h>
2769#include <linux/debugfs.h>
2770#include <linux/seq_file.h>
2771#include <linux/init.h>
2772#include <linux/kobject.h>
9e9704ea 2773static struct dentry *genpd_debugfs_dir;
2bd5306a
MM		 2774
2775/*
2776 * TODO: This function is a slightly modified version of rtpm_status_show
d30d819d 2777 * from sysfs.c, so generalize it.
2bd5306a 2778 */
2bd5306a
MM		 2779static void rtpm_status_str(struct seq_file *s, struct device *dev)
2780{
2781 static const char * const status_lookup[] = {
2782 [RPM_ACTIVE] = "active",
2783 [RPM_RESUMING] = "resuming",
2784 [RPM_SUSPENDED] = "suspended",
2785 [RPM_SUSPENDING] = "suspending"
2786 };
2787 const char *p = "";
2788
2789 if (dev->power.runtime_error)
2790 p = "error";
2791 else if (dev->power.disable_depth)
2792 p = "unsupported";
2793 else if (dev->power.runtime_status < ARRAY_SIZE(status_lookup))
2794 p = status_lookup[dev->power.runtime_status];
2795 else
2796 WARN_ON(1);
2797
2798 seq_puts(s, p);
2799}
2bd5306a 2800
9e9704ea
UH		 2801static int genpd_summary_one(struct seq_file *s,
2802 struct generic_pm_domain *genpd)
2bd5306a
MM		 2803{
2804 static const char * const status_lookup[] = {
2805 [GPD_STATE_ACTIVE] = "on",
2bd5306a
MM		 2806 [GPD_STATE_POWER_OFF] = "off"
2807 };
2808 struct pm_domain_data *pm_data;
2809 const char *kobj_path;
2810 struct gpd_link *link;
6954d432 2811 char state[16];
2bd5306a
MM		 2812 int ret;
2813
35241d12 2814 ret = genpd_lock_interruptible(genpd);
2bd5306a
MM		 2815 if (ret)
2816 return -ERESTARTSYS;
2817
66a5ca4b 2818 if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup)))
2bd5306a 2819 goto exit;
41e2c8e0 2820 if (!genpd_status_on(genpd))
0ba554e4 2821 snprintf(state, sizeof(state), "%s-%u",
6954d432 2822 status_lookup[genpd->status], genpd->state_idx);
fc5cbf0c 2823 else
6954d432
GU		 2824 snprintf(state, sizeof(state), "%s",
2825 status_lookup[genpd->status]);
2826 seq_printf(s, "%-30s %-15s ", genpd->name, state);
2bd5306a
MM		 2827
2828 /*
2829 * Modifications on the list require holding locks on both
2830 * master and slave, so we are safe.
66a5ca4b 2831 * Also genpd->name is immutable.
2bd5306a 2832 */
66a5ca4b 2833 list_for_each_entry(link, &genpd->master_links, master_node) {
2bd5306a 2834 seq_printf(s, "%s", link->slave->name);
66a5ca4b 2835 if (!list_is_last(&link->master_node, &genpd->master_links))
2bd5306a
MM		 2836 seq_puts(s, ", ");
2837 }
2838
66a5ca4b 2839 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
d716f479
LI		 2840 kobj_path = kobject_get_path(&pm_data->dev->kobj,
2841 genpd_is_irq_safe(genpd) ?
2842 GFP_ATOMIC : GFP_KERNEL);
2bd5306a
MM		 2843 if (kobj_path == NULL)
2844 continue;
2845
2846 seq_printf(s, "\n %-50s ", kobj_path);
2847 rtpm_status_str(s, pm_data->dev);
2848 kfree(kobj_path);
2849 }
2850
2851 seq_puts(s, "\n");
2852exit:
35241d12 2853 genpd_unlock(genpd);
2bd5306a
MM		 2854
2855 return 0;
2856}
2857
d32dcc6c 2858static int summary_show(struct seq_file *s, void *data)
2bd5306a 2859{
66a5ca4b 2860 struct generic_pm_domain *genpd;
2bd5306a
MM		 2861 int ret = 0;
2862
15dec67a
GU		 2863 seq_puts(s, "domain status slaves\n");
2864 seq_puts(s, " /device runtime status\n");
2bd5306a
MM		 2865 seq_puts(s, "----------------------------------------------------------------------\n");
2866
2867 ret = mutex_lock_interruptible(&gpd_list_lock);
2868 if (ret)
2869 return -ERESTARTSYS;
2870
66a5ca4b 2871 list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
9e9704ea 2872 ret = genpd_summary_one(s, genpd);
2bd5306a
MM		 2873 if (ret)
2874 break;
2875 }
2876 mutex_unlock(&gpd_list_lock);
2877
2878 return ret;
2879}
2880
d32dcc6c 2881static int status_show(struct seq_file *s, void *data)
2bd5306a 2882{
b6a1d093
TG		 2883 static const char * const status_lookup[] = {
2884 [GPD_STATE_ACTIVE] = "on",
2885 [GPD_STATE_POWER_OFF] = "off"
2886 };
2887
2888 struct generic_pm_domain *genpd = s->private;
2889 int ret = 0;
2890
2891 ret = genpd_lock_interruptible(genpd);
2892 if (ret)
2893 return -ERESTARTSYS;
2894
2895 if (WARN_ON_ONCE(genpd->status >= ARRAY_SIZE(status_lookup)))
2896 goto exit;
2897
2898 if (genpd->status == GPD_STATE_POWER_OFF)
2899 seq_printf(s, "%s-%u\n", status_lookup[genpd->status],
2900 genpd->state_idx);
2901 else
2902 seq_printf(s, "%s\n", status_lookup[genpd->status]);
2903exit:
2904 genpd_unlock(genpd);
2905 return ret;
2bd5306a
MM		 2906}
2907
d32dcc6c 2908static int sub_domains_show(struct seq_file *s, void *data)
b6a1d093
TG		 2909{
2910 struct generic_pm_domain *genpd = s->private;
2911 struct gpd_link *link;
2912 int ret = 0;
2913
2914 ret = genpd_lock_interruptible(genpd);
2915 if (ret)
2916 return -ERESTARTSYS;
2917
2918 list_for_each_entry(link, &genpd->master_links, master_node)
2919 seq_printf(s, "%s\n", link->slave->name);
2920
2921 genpd_unlock(genpd);
2922 return ret;
2923}
2924
d32dcc6c 2925static int idle_states_show(struct seq_file *s, void *data)
b6a1d093
TG		 2926{
2927 struct generic_pm_domain *genpd = s->private;
2928 unsigned int i;
2929 int ret = 0;
2930
2931 ret = genpd_lock_interruptible(genpd);
2932 if (ret)
2933 return -ERESTARTSYS;
2934
2935 seq_puts(s, "State Time Spent(ms)\n");
2936
2937 for (i = 0; i < genpd->state_count; i++) {
2938 ktime_t delta = 0;
2939 s64 msecs;
2940
2941 if ((genpd->status == GPD_STATE_POWER_OFF) &&
2942 (genpd->state_idx == i))
2943 delta = ktime_sub(ktime_get(), genpd->accounting_time);
2944
2945 msecs = ktime_to_ms(
2946 ktime_add(genpd->states[i].idle_time, delta));
2947 seq_printf(s, "S%-13i %lld\n", i, msecs);
2948 }
2949
2950 genpd_unlock(genpd);
2951 return ret;
2952}
2953
d32dcc6c 2954static int active_time_show(struct seq_file *s, void *data)
b6a1d093
TG		 2955{
2956 struct generic_pm_domain *genpd = s->private;
2957 ktime_t delta = 0;
2958 int ret = 0;
2959
2960 ret = genpd_lock_interruptible(genpd);
2961 if (ret)
2962 return -ERESTARTSYS;
2963
2964 if (genpd->status == GPD_STATE_ACTIVE)
2965 delta = ktime_sub(ktime_get(), genpd->accounting_time);
2966
2967 seq_printf(s, "%lld ms\n", ktime_to_ms(
2968 ktime_add(genpd->on_time, delta)));
2969
2970 genpd_unlock(genpd);
2971 return ret;
2972}
2973
d32dcc6c 2974static int total_idle_time_show(struct seq_file *s, void *data)
b6a1d093
TG		 2975{
2976 struct generic_pm_domain *genpd = s->private;
2977 ktime_t delta = 0, total = 0;
2978 unsigned int i;
2979 int ret = 0;
2980
2981 ret = genpd_lock_interruptible(genpd);
2982 if (ret)
2983 return -ERESTARTSYS;
2984
2985 for (i = 0; i < genpd->state_count; i++) {
2986
2987 if ((genpd->status == GPD_STATE_POWER_OFF) &&
2988 (genpd->state_idx == i))
2989 delta = ktime_sub(ktime_get(), genpd->accounting_time);
2990
2991 total = ktime_add(total, genpd->states[i].idle_time);
2992 }
2993 total = ktime_add(total, delta);
2994
2995 seq_printf(s, "%lld ms\n", ktime_to_ms(total));
2996
2997 genpd_unlock(genpd);
2998 return ret;
2999}
3000
3001
d32dcc6c 3002static int devices_show(struct seq_file *s, void *data)
b6a1d093
TG		 3003{
3004 struct generic_pm_domain *genpd = s->private;
3005 struct pm_domain_data *pm_data;
3006 const char *kobj_path;
3007 int ret = 0;
3008
3009 ret = genpd_lock_interruptible(genpd);
3010 if (ret)
3011 return -ERESTARTSYS;
3012
3013 list_for_each_entry(pm_data, &genpd->dev_list, list_node) {
3014 kobj_path = kobject_get_path(&pm_data->dev->kobj,
3015 genpd_is_irq_safe(genpd) ?
3016 GFP_ATOMIC : GFP_KERNEL);
3017 if (kobj_path == NULL)
3018 continue;
3019
3020 seq_printf(s, "%s\n", kobj_path);
3021 kfree(kobj_path);
3022 }
3023
3024 genpd_unlock(genpd);
3025 return ret;
3026}
3027
d32dcc6c 3028static int perf_state_show(struct seq_file *s, void *data)
e8912812
RN		 3029{
3030 struct generic_pm_domain *genpd = s->private;
3031
3032 if (genpd_lock_interruptible(genpd))
3033 return -ERESTARTSYS;
3034
3035 seq_printf(s, "%u\n", genpd->performance_state);
3036
3037 genpd_unlock(genpd);
3038 return 0;
3039}
3040
d32dcc6c
YL		 3041DEFINE_SHOW_ATTRIBUTE(summary);
3042DEFINE_SHOW_ATTRIBUTE(status);
3043DEFINE_SHOW_ATTRIBUTE(sub_domains);
3044DEFINE_SHOW_ATTRIBUTE(idle_states);
3045DEFINE_SHOW_ATTRIBUTE(active_time);
3046DEFINE_SHOW_ATTRIBUTE(total_idle_time);
3047DEFINE_SHOW_ATTRIBUTE(devices);
3048DEFINE_SHOW_ATTRIBUTE(perf_state);
2bd5306a 3049
9e9704ea 3050static int __init genpd_debug_init(void)
2bd5306a
MM		 3051{
3052 struct dentry *d;
b6a1d093 3053 struct generic_pm_domain *genpd;
2bd5306a 3054
9e9704ea 3055 genpd_debugfs_dir = debugfs_create_dir("pm_genpd", NULL);
2bd5306a 3056
e16a42c3
GKH		 3057 debugfs_create_file("pm_genpd_summary", S_IRUGO, genpd_debugfs_dir,
3058 NULL, &summary_fops);
2bd5306a 3059
b6a1d093 3060 list_for_each_entry(genpd, &gpd_list, gpd_list_node) {
9e9704ea 3061 d = debugfs_create_dir(genpd->name, genpd_debugfs_dir);
b6a1d093
TG		 3062
3063 debugfs_create_file("current_state", 0444,
d32dcc6c 3064 d, genpd, &status_fops);
b6a1d093 3065 debugfs_create_file("sub_domains", 0444,
d32dcc6c 3066 d, genpd, &sub_domains_fops);
b6a1d093 3067 debugfs_create_file("idle_states", 0444,
d32dcc6c 3068 d, genpd, &idle_states_fops);
b6a1d093 3069 debugfs_create_file("active_time", 0444,
d32dcc6c 3070 d, genpd, &active_time_fops);
b6a1d093 3071 debugfs_create_file("total_idle_time", 0444,
d32dcc6c 3072 d, genpd, &total_idle_time_fops);
b6a1d093 3073 debugfs_create_file("devices", 0444,
d32dcc6c 3074 d, genpd, &devices_fops);
e8912812
RN		 3075 if (genpd->set_performance_state)
3076 debugfs_create_file("perf_state", 0444,
d32dcc6c 3077 d, genpd, &perf_state_fops);
b6a1d093
TG		 3078 }
3079
2bd5306a
MM		 3080 return 0;
3081}
9e9704ea 3082late_initcall(genpd_debug_init);
2bd5306a 3083
9e9704ea 3084static void __exit genpd_debug_exit(void)
2bd5306a 3085{
9e9704ea 3086 debugfs_remove_recursive(genpd_debugfs_dir);
2bd5306a 3087}
9e9704ea 3088__exitcall(genpd_debug_exit);
8b0510b5 3089#endif /* CONFIG_DEBUG_FS */
Linux 6.x block layer and io_uring tree(s)