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1 | /* |
2 | * drivers/base/power/domain.c - Common code related to device power domains. |
3 | * |
4 | * Copyright (C) 2011 Rafael J. Wysocki <rjw@sisk.pl>, Renesas Electronics Corp. |
5 | * |
6 | * This file is released under the GPLv2. |
7 | */ |
8 | |
9 | #include <linux/init.h> |
10 | #include <linux/kernel.h> |
11 | #include <linux/io.h> |
12 | #include <linux/pm_runtime.h> |
13 | #include <linux/pm_domain.h> |
14 | #include <linux/pm_qos.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/err.h> |
17 | #include <linux/sched.h> |
18 | #include <linux/suspend.h> |
19 | #include <linux/export.h> |
20 | |
21 | #define GENPD_DEV_CALLBACK(genpd, type, callback, dev) \ |
22 | ({ \ |
23 | type (*__routine)(struct device *__d); \ |
24 | type __ret = (type)0; \ |
25 | \ |
26 | __routine = genpd->dev_ops.callback; \ |
27 | if (__routine) { \ |
28 | __ret = __routine(dev); \ |
29 | } else { \ |
30 | __routine = dev_gpd_data(dev)->ops.callback; \ |
31 | if (__routine) \ |
32 | __ret = __routine(dev); \ |
33 | } \ |
34 | __ret; \ |
35 | }) |
36 | |
37 | #define GENPD_DEV_TIMED_CALLBACK(genpd, type, callback, dev, field, name) \ |
38 | ({ \ |
39 | ktime_t __start = ktime_get(); \ |
40 | type __retval = GENPD_DEV_CALLBACK(genpd, type, callback, dev); \ |
41 | s64 __elapsed = ktime_to_ns(ktime_sub(ktime_get(), __start)); \ |
42 | struct gpd_timing_data *__td = &dev_gpd_data(dev)->td; \ |
43 | if (!__retval && __elapsed > __td->field) { \ |
44 | __td->field = __elapsed; \ |
45 | dev_warn(dev, name " latency exceeded, new value %lld ns\n", \ |
46 | __elapsed); \ |
47 | genpd->max_off_time_changed = true; \ |
48 | __td->constraint_changed = true; \ |
49 | } \ |
50 | __retval; \ |
51 | }) |
52 | |
53 | static LIST_HEAD(gpd_list); |
54 | static DEFINE_MUTEX(gpd_list_lock); |
55 | |
56 | static struct generic_pm_domain *pm_genpd_lookup_name(const char *domain_name) |
57 | { |
58 | struct generic_pm_domain *genpd = NULL, *gpd; |
59 | |
60 | if (IS_ERR_OR_NULL(domain_name)) |
61 | return NULL; |
62 | |
63 | mutex_lock(&gpd_list_lock); |
64 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
65 | if (!strcmp(gpd->name, domain_name)) { |
66 | genpd = gpd; |
67 | break; |
68 | } |
69 | } |
70 | mutex_unlock(&gpd_list_lock); |
71 | return genpd; |
72 | } |
73 | |
74 | #ifdef CONFIG_PM |
75 | |
76 | struct generic_pm_domain *dev_to_genpd(struct device *dev) |
77 | { |
78 | if (IS_ERR_OR_NULL(dev->pm_domain)) |
79 | return ERR_PTR(-EINVAL); |
80 | |
81 | return pd_to_genpd(dev->pm_domain); |
82 | } |
83 | |
84 | static int genpd_stop_dev(struct generic_pm_domain *genpd, struct device *dev) |
85 | { |
86 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, stop, dev, |
87 | stop_latency_ns, "stop"); |
88 | } |
89 | |
90 | static int genpd_start_dev(struct generic_pm_domain *genpd, struct device *dev) |
91 | { |
92 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, start, dev, |
93 | start_latency_ns, "start"); |
94 | } |
95 | |
96 | static bool genpd_sd_counter_dec(struct generic_pm_domain *genpd) |
97 | { |
98 | bool ret = false; |
99 | |
100 | if (!WARN_ON(atomic_read(&genpd->sd_count) == 0)) |
101 | ret = !!atomic_dec_and_test(&genpd->sd_count); |
102 | |
103 | return ret; |
104 | } |
105 | |
106 | static void genpd_sd_counter_inc(struct generic_pm_domain *genpd) |
107 | { |
108 | atomic_inc(&genpd->sd_count); |
109 | smp_mb__after_atomic_inc(); |
110 | } |
111 | |
112 | static void genpd_acquire_lock(struct generic_pm_domain *genpd) |
113 | { |
114 | DEFINE_WAIT(wait); |
115 | |
116 | mutex_lock(&genpd->lock); |
117 | /* |
118 | * Wait for the domain to transition into either the active, |
119 | * or the power off state. |
120 | */ |
121 | for (;;) { |
122 | prepare_to_wait(&genpd->status_wait_queue, &wait, |
123 | TASK_UNINTERRUPTIBLE); |
124 | if (genpd->status == GPD_STATE_ACTIVE |
125 | || genpd->status == GPD_STATE_POWER_OFF) |
126 | break; |
127 | mutex_unlock(&genpd->lock); |
128 | |
129 | schedule(); |
130 | |
131 | mutex_lock(&genpd->lock); |
132 | } |
133 | finish_wait(&genpd->status_wait_queue, &wait); |
134 | } |
135 | |
136 | static void genpd_release_lock(struct generic_pm_domain *genpd) |
137 | { |
138 | mutex_unlock(&genpd->lock); |
139 | } |
140 | |
141 | static void genpd_set_active(struct generic_pm_domain *genpd) |
142 | { |
143 | if (genpd->resume_count == 0) |
144 | genpd->status = GPD_STATE_ACTIVE; |
145 | } |
146 | |
147 | static void genpd_recalc_cpu_exit_latency(struct generic_pm_domain *genpd) |
148 | { |
149 | s64 usecs64; |
150 | |
151 | if (!genpd->cpu_data) |
152 | return; |
153 | |
154 | usecs64 = genpd->power_on_latency_ns; |
155 | do_div(usecs64, NSEC_PER_USEC); |
156 | usecs64 += genpd->cpu_data->saved_exit_latency; |
157 | genpd->cpu_data->idle_state->exit_latency = usecs64; |
158 | } |
159 | |
160 | /** |
161 | * __pm_genpd_poweron - Restore power to a given PM domain and its masters. |
162 | * @genpd: PM domain to power up. |
163 | * |
164 | * Restore power to @genpd and all of its masters so that it is possible to |
165 | * resume a device belonging to it. |
166 | */ |
167 | static int __pm_genpd_poweron(struct generic_pm_domain *genpd) |
168 | __releases(&genpd->lock) __acquires(&genpd->lock) |
169 | { |
170 | struct gpd_link *link; |
171 | DEFINE_WAIT(wait); |
172 | int ret = 0; |
173 | |
174 | /* If the domain's master is being waited for, we have to wait too. */ |
175 | for (;;) { |
176 | prepare_to_wait(&genpd->status_wait_queue, &wait, |
177 | TASK_UNINTERRUPTIBLE); |
178 | if (genpd->status != GPD_STATE_WAIT_MASTER) |
179 | break; |
180 | mutex_unlock(&genpd->lock); |
181 | |
182 | schedule(); |
183 | |
184 | mutex_lock(&genpd->lock); |
185 | } |
186 | finish_wait(&genpd->status_wait_queue, &wait); |
187 | |
188 | if (genpd->status == GPD_STATE_ACTIVE |
189 | || (genpd->prepared_count > 0 && genpd->suspend_power_off)) |
190 | return 0; |
191 | |
192 | if (genpd->status != GPD_STATE_POWER_OFF) { |
193 | genpd_set_active(genpd); |
194 | return 0; |
195 | } |
196 | |
197 | if (genpd->cpu_data) { |
198 | cpuidle_pause_and_lock(); |
199 | genpd->cpu_data->idle_state->disabled = true; |
200 | cpuidle_resume_and_unlock(); |
201 | goto out; |
202 | } |
203 | |
204 | /* |
205 | * The list is guaranteed not to change while the loop below is being |
206 | * executed, unless one of the masters' .power_on() callbacks fiddles |
207 | * with it. |
208 | */ |
209 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
210 | genpd_sd_counter_inc(link->master); |
211 | genpd->status = GPD_STATE_WAIT_MASTER; |
212 | |
213 | mutex_unlock(&genpd->lock); |
214 | |
215 | ret = pm_genpd_poweron(link->master); |
216 | |
217 | mutex_lock(&genpd->lock); |
218 | |
219 | /* |
220 | * The "wait for parent" status is guaranteed not to change |
221 | * while the master is powering on. |
222 | */ |
223 | genpd->status = GPD_STATE_POWER_OFF; |
224 | wake_up_all(&genpd->status_wait_queue); |
225 | if (ret) { |
226 | genpd_sd_counter_dec(link->master); |
227 | goto err; |
228 | } |
229 | } |
230 | |
231 | if (genpd->power_on) { |
232 | ktime_t time_start = ktime_get(); |
233 | s64 elapsed_ns; |
234 | |
235 | ret = genpd->power_on(genpd); |
236 | if (ret) |
237 | goto err; |
238 | |
239 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
240 | if (elapsed_ns > genpd->power_on_latency_ns) { |
241 | genpd->power_on_latency_ns = elapsed_ns; |
242 | genpd->max_off_time_changed = true; |
243 | genpd_recalc_cpu_exit_latency(genpd); |
244 | if (genpd->name) |
245 | pr_warning("%s: Power-on latency exceeded, " |
246 | "new value %lld ns\n", genpd->name, |
247 | elapsed_ns); |
248 | } |
249 | } |
250 | |
251 | out: |
252 | genpd_set_active(genpd); |
253 | |
254 | return 0; |
255 | |
256 | err: |
257 | list_for_each_entry_continue_reverse(link, &genpd->slave_links, slave_node) |
258 | genpd_sd_counter_dec(link->master); |
259 | |
260 | return ret; |
261 | } |
262 | |
263 | /** |
264 | * pm_genpd_poweron - Restore power to a given PM domain and its masters. |
265 | * @genpd: PM domain to power up. |
266 | */ |
267 | int pm_genpd_poweron(struct generic_pm_domain *genpd) |
268 | { |
269 | int ret; |
270 | |
271 | mutex_lock(&genpd->lock); |
272 | ret = __pm_genpd_poweron(genpd); |
273 | mutex_unlock(&genpd->lock); |
274 | return ret; |
275 | } |
276 | |
277 | /** |
278 | * pm_genpd_name_poweron - Restore power to a given PM domain and its masters. |
279 | * @domain_name: Name of the PM domain to power up. |
280 | */ |
281 | int pm_genpd_name_poweron(const char *domain_name) |
282 | { |
283 | struct generic_pm_domain *genpd; |
284 | |
285 | genpd = pm_genpd_lookup_name(domain_name); |
286 | return genpd ? pm_genpd_poweron(genpd) : -EINVAL; |
287 | } |
288 | |
289 | #endif /* CONFIG_PM */ |
290 | |
291 | #ifdef CONFIG_PM_RUNTIME |
292 | |
293 | static int genpd_start_dev_no_timing(struct generic_pm_domain *genpd, |
294 | struct device *dev) |
295 | { |
296 | return GENPD_DEV_CALLBACK(genpd, int, start, dev); |
297 | } |
298 | |
299 | static int genpd_save_dev(struct generic_pm_domain *genpd, struct device *dev) |
300 | { |
301 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, save_state, dev, |
302 | save_state_latency_ns, "state save"); |
303 | } |
304 | |
305 | static int genpd_restore_dev(struct generic_pm_domain *genpd, struct device *dev) |
306 | { |
307 | return GENPD_DEV_TIMED_CALLBACK(genpd, int, restore_state, dev, |
308 | restore_state_latency_ns, |
309 | "state restore"); |
310 | } |
311 | |
312 | static int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
313 | unsigned long val, void *ptr) |
314 | { |
315 | struct generic_pm_domain_data *gpd_data; |
316 | struct device *dev; |
317 | |
318 | gpd_data = container_of(nb, struct generic_pm_domain_data, nb); |
319 | |
320 | mutex_lock(&gpd_data->lock); |
321 | dev = gpd_data->base.dev; |
322 | if (!dev) { |
323 | mutex_unlock(&gpd_data->lock); |
324 | return NOTIFY_DONE; |
325 | } |
326 | mutex_unlock(&gpd_data->lock); |
327 | |
328 | for (;;) { |
329 | struct generic_pm_domain *genpd; |
330 | struct pm_domain_data *pdd; |
331 | |
332 | spin_lock_irq(&dev->power.lock); |
333 | |
334 | pdd = dev->power.subsys_data ? |
335 | dev->power.subsys_data->domain_data : NULL; |
336 | if (pdd && pdd->dev) { |
337 | to_gpd_data(pdd)->td.constraint_changed = true; |
338 | genpd = dev_to_genpd(dev); |
339 | } else { |
340 | genpd = ERR_PTR(-ENODATA); |
341 | } |
342 | |
343 | spin_unlock_irq(&dev->power.lock); |
344 | |
345 | if (!IS_ERR(genpd)) { |
346 | mutex_lock(&genpd->lock); |
347 | genpd->max_off_time_changed = true; |
348 | mutex_unlock(&genpd->lock); |
349 | } |
350 | |
351 | dev = dev->parent; |
352 | if (!dev || dev->power.ignore_children) |
353 | break; |
354 | } |
355 | |
356 | return NOTIFY_DONE; |
357 | } |
358 | |
359 | /** |
360 | * __pm_genpd_save_device - Save the pre-suspend state of a device. |
361 | * @pdd: Domain data of the device to save the state of. |
362 | * @genpd: PM domain the device belongs to. |
363 | */ |
364 | static int __pm_genpd_save_device(struct pm_domain_data *pdd, |
365 | struct generic_pm_domain *genpd) |
366 | __releases(&genpd->lock) __acquires(&genpd->lock) |
367 | { |
368 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
369 | struct device *dev = pdd->dev; |
370 | int ret = 0; |
371 | |
372 | if (gpd_data->need_restore) |
373 | return 0; |
374 | |
375 | mutex_unlock(&genpd->lock); |
376 | |
377 | genpd_start_dev(genpd, dev); |
378 | ret = genpd_save_dev(genpd, dev); |
379 | genpd_stop_dev(genpd, dev); |
380 | |
381 | mutex_lock(&genpd->lock); |
382 | |
383 | if (!ret) |
384 | gpd_data->need_restore = true; |
385 | |
386 | return ret; |
387 | } |
388 | |
389 | /** |
390 | * __pm_genpd_restore_device - Restore the pre-suspend state of a device. |
391 | * @pdd: Domain data of the device to restore the state of. |
392 | * @genpd: PM domain the device belongs to. |
393 | */ |
394 | static void __pm_genpd_restore_device(struct pm_domain_data *pdd, |
395 | struct generic_pm_domain *genpd) |
396 | __releases(&genpd->lock) __acquires(&genpd->lock) |
397 | { |
398 | struct generic_pm_domain_data *gpd_data = to_gpd_data(pdd); |
399 | struct device *dev = pdd->dev; |
400 | bool need_restore = gpd_data->need_restore; |
401 | |
402 | gpd_data->need_restore = false; |
403 | mutex_unlock(&genpd->lock); |
404 | |
405 | genpd_start_dev(genpd, dev); |
406 | if (need_restore) |
407 | genpd_restore_dev(genpd, dev); |
408 | |
409 | mutex_lock(&genpd->lock); |
410 | } |
411 | |
412 | /** |
413 | * genpd_abort_poweroff - Check if a PM domain power off should be aborted. |
414 | * @genpd: PM domain to check. |
415 | * |
416 | * Return true if a PM domain's status changed to GPD_STATE_ACTIVE during |
417 | * a "power off" operation, which means that a "power on" has occured in the |
418 | * meantime, or if its resume_count field is different from zero, which means |
419 | * that one of its devices has been resumed in the meantime. |
420 | */ |
421 | static bool genpd_abort_poweroff(struct generic_pm_domain *genpd) |
422 | { |
423 | return genpd->status == GPD_STATE_WAIT_MASTER |
424 | || genpd->status == GPD_STATE_ACTIVE || genpd->resume_count > 0; |
425 | } |
426 | |
427 | /** |
428 | * genpd_queue_power_off_work - Queue up the execution of pm_genpd_poweroff(). |
429 | * @genpd: PM domait to power off. |
430 | * |
431 | * Queue up the execution of pm_genpd_poweroff() unless it's already been done |
432 | * before. |
433 | */ |
434 | void genpd_queue_power_off_work(struct generic_pm_domain *genpd) |
435 | { |
436 | queue_work(pm_wq, &genpd->power_off_work); |
437 | } |
438 | |
439 | /** |
440 | * pm_genpd_poweroff - Remove power from a given PM domain. |
441 | * @genpd: PM domain to power down. |
442 | * |
443 | * If all of the @genpd's devices have been suspended and all of its subdomains |
444 | * have been powered down, run the runtime suspend callbacks provided by all of |
445 | * the @genpd's devices' drivers and remove power from @genpd. |
446 | */ |
447 | static int pm_genpd_poweroff(struct generic_pm_domain *genpd) |
448 | __releases(&genpd->lock) __acquires(&genpd->lock) |
449 | { |
450 | struct pm_domain_data *pdd; |
451 | struct gpd_link *link; |
452 | unsigned int not_suspended; |
453 | int ret = 0; |
454 | |
455 | start: |
456 | /* |
457 | * Do not try to power off the domain in the following situations: |
458 | * (1) The domain is already in the "power off" state. |
459 | * (2) The domain is waiting for its master to power up. |
460 | * (3) One of the domain's devices is being resumed right now. |
461 | * (4) System suspend is in progress. |
462 | */ |
463 | if (genpd->status == GPD_STATE_POWER_OFF |
464 | || genpd->status == GPD_STATE_WAIT_MASTER |
465 | || genpd->resume_count > 0 || genpd->prepared_count > 0) |
466 | return 0; |
467 | |
468 | if (atomic_read(&genpd->sd_count) > 0) |
469 | return -EBUSY; |
470 | |
471 | not_suspended = 0; |
472 | list_for_each_entry(pdd, &genpd->dev_list, list_node) { |
473 | enum pm_qos_flags_status stat; |
474 | |
475 | stat = dev_pm_qos_flags(pdd->dev, |
476 | PM_QOS_FLAG_NO_POWER_OFF |
477 | | PM_QOS_FLAG_REMOTE_WAKEUP); |
478 | if (stat > PM_QOS_FLAGS_NONE) |
479 | return -EBUSY; |
480 | |
481 | if (pdd->dev->driver && (!pm_runtime_suspended(pdd->dev) |
482 | || pdd->dev->power.irq_safe)) |
483 | not_suspended++; |
484 | } |
485 | |
486 | if (not_suspended > genpd->in_progress) |
487 | return -EBUSY; |
488 | |
489 | if (genpd->poweroff_task) { |
490 | /* |
491 | * Another instance of pm_genpd_poweroff() is executing |
492 | * callbacks, so tell it to start over and return. |
493 | */ |
494 | genpd->status = GPD_STATE_REPEAT; |
495 | return 0; |
496 | } |
497 | |
498 | if (genpd->gov && genpd->gov->power_down_ok) { |
499 | if (!genpd->gov->power_down_ok(&genpd->domain)) |
500 | return -EAGAIN; |
501 | } |
502 | |
503 | genpd->status = GPD_STATE_BUSY; |
504 | genpd->poweroff_task = current; |
505 | |
506 | list_for_each_entry_reverse(pdd, &genpd->dev_list, list_node) { |
507 | ret = atomic_read(&genpd->sd_count) == 0 ? |
508 | __pm_genpd_save_device(pdd, genpd) : -EBUSY; |
509 | |
510 | if (genpd_abort_poweroff(genpd)) |
511 | goto out; |
512 | |
513 | if (ret) { |
514 | genpd_set_active(genpd); |
515 | goto out; |
516 | } |
517 | |
518 | if (genpd->status == GPD_STATE_REPEAT) { |
519 | genpd->poweroff_task = NULL; |
520 | goto start; |
521 | } |
522 | } |
523 | |
524 | if (genpd->cpu_data) { |
525 | /* |
526 | * If cpu_data is set, cpuidle should turn the domain off when |
527 | * the CPU in it is idle. In that case we don't decrement the |
528 | * subdomain counts of the master domains, so that power is not |
529 | * removed from the current domain prematurely as a result of |
530 | * cutting off the masters' power. |
531 | */ |
532 | genpd->status = GPD_STATE_POWER_OFF; |
533 | cpuidle_pause_and_lock(); |
534 | genpd->cpu_data->idle_state->disabled = false; |
535 | cpuidle_resume_and_unlock(); |
536 | goto out; |
537 | } |
538 | |
539 | if (genpd->power_off) { |
540 | ktime_t time_start; |
541 | s64 elapsed_ns; |
542 | |
543 | if (atomic_read(&genpd->sd_count) > 0) { |
544 | ret = -EBUSY; |
545 | goto out; |
546 | } |
547 | |
548 | time_start = ktime_get(); |
549 | |
550 | /* |
551 | * If sd_count > 0 at this point, one of the subdomains hasn't |
552 | * managed to call pm_genpd_poweron() for the master yet after |
553 | * incrementing it. In that case pm_genpd_poweron() will wait |
554 | * for us to drop the lock, so we can call .power_off() and let |
555 | * the pm_genpd_poweron() restore power for us (this shouldn't |
556 | * happen very often). |
557 | */ |
558 | ret = genpd->power_off(genpd); |
559 | if (ret == -EBUSY) { |
560 | genpd_set_active(genpd); |
561 | goto out; |
562 | } |
563 | |
564 | elapsed_ns = ktime_to_ns(ktime_sub(ktime_get(), time_start)); |
565 | if (elapsed_ns > genpd->power_off_latency_ns) { |
566 | genpd->power_off_latency_ns = elapsed_ns; |
567 | genpd->max_off_time_changed = true; |
568 | if (genpd->name) |
569 | pr_warning("%s: Power-off latency exceeded, " |
570 | "new value %lld ns\n", genpd->name, |
571 | elapsed_ns); |
572 | } |
573 | } |
574 | |
575 | genpd->status = GPD_STATE_POWER_OFF; |
576 | |
577 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
578 | genpd_sd_counter_dec(link->master); |
579 | genpd_queue_power_off_work(link->master); |
580 | } |
581 | |
582 | out: |
583 | genpd->poweroff_task = NULL; |
584 | wake_up_all(&genpd->status_wait_queue); |
585 | return ret; |
586 | } |
587 | |
588 | /** |
589 | * genpd_power_off_work_fn - Power off PM domain whose subdomain count is 0. |
590 | * @work: Work structure used for scheduling the execution of this function. |
591 | */ |
592 | static void genpd_power_off_work_fn(struct work_struct *work) |
593 | { |
594 | struct generic_pm_domain *genpd; |
595 | |
596 | genpd = container_of(work, struct generic_pm_domain, power_off_work); |
597 | |
598 | genpd_acquire_lock(genpd); |
599 | pm_genpd_poweroff(genpd); |
600 | genpd_release_lock(genpd); |
601 | } |
602 | |
603 | /** |
604 | * pm_genpd_runtime_suspend - Suspend a device belonging to I/O PM domain. |
605 | * @dev: Device to suspend. |
606 | * |
607 | * Carry out a runtime suspend of a device under the assumption that its |
608 | * pm_domain field points to the domain member of an object of type |
609 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. |
610 | */ |
611 | static int pm_genpd_runtime_suspend(struct device *dev) |
612 | { |
613 | struct generic_pm_domain *genpd; |
614 | bool (*stop_ok)(struct device *__dev); |
615 | int ret; |
616 | |
617 | dev_dbg(dev, "%s()\n", __func__); |
618 | |
619 | genpd = dev_to_genpd(dev); |
620 | if (IS_ERR(genpd)) |
621 | return -EINVAL; |
622 | |
623 | might_sleep_if(!genpd->dev_irq_safe); |
624 | |
625 | stop_ok = genpd->gov ? genpd->gov->stop_ok : NULL; |
626 | if (stop_ok && !stop_ok(dev)) |
627 | return -EBUSY; |
628 | |
629 | ret = genpd_stop_dev(genpd, dev); |
630 | if (ret) |
631 | return ret; |
632 | |
633 | /* |
634 | * If power.irq_safe is set, this routine will be run with interrupts |
635 | * off, so it can't use mutexes. |
636 | */ |
637 | if (dev->power.irq_safe) |
638 | return 0; |
639 | |
640 | mutex_lock(&genpd->lock); |
641 | genpd->in_progress++; |
642 | pm_genpd_poweroff(genpd); |
643 | genpd->in_progress--; |
644 | mutex_unlock(&genpd->lock); |
645 | |
646 | return 0; |
647 | } |
648 | |
649 | /** |
650 | * pm_genpd_runtime_resume - Resume a device belonging to I/O PM domain. |
651 | * @dev: Device to resume. |
652 | * |
653 | * Carry out a runtime resume of a device under the assumption that its |
654 | * pm_domain field points to the domain member of an object of type |
655 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. |
656 | */ |
657 | static int pm_genpd_runtime_resume(struct device *dev) |
658 | { |
659 | struct generic_pm_domain *genpd; |
660 | DEFINE_WAIT(wait); |
661 | int ret; |
662 | |
663 | dev_dbg(dev, "%s()\n", __func__); |
664 | |
665 | genpd = dev_to_genpd(dev); |
666 | if (IS_ERR(genpd)) |
667 | return -EINVAL; |
668 | |
669 | might_sleep_if(!genpd->dev_irq_safe); |
670 | |
671 | /* If power.irq_safe, the PM domain is never powered off. */ |
672 | if (dev->power.irq_safe) |
673 | return genpd_start_dev_no_timing(genpd, dev); |
674 | |
675 | mutex_lock(&genpd->lock); |
676 | ret = __pm_genpd_poweron(genpd); |
677 | if (ret) { |
678 | mutex_unlock(&genpd->lock); |
679 | return ret; |
680 | } |
681 | genpd->status = GPD_STATE_BUSY; |
682 | genpd->resume_count++; |
683 | for (;;) { |
684 | prepare_to_wait(&genpd->status_wait_queue, &wait, |
685 | TASK_UNINTERRUPTIBLE); |
686 | /* |
687 | * If current is the powering off task, we have been called |
688 | * reentrantly from one of the device callbacks, so we should |
689 | * not wait. |
690 | */ |
691 | if (!genpd->poweroff_task || genpd->poweroff_task == current) |
692 | break; |
693 | mutex_unlock(&genpd->lock); |
694 | |
695 | schedule(); |
696 | |
697 | mutex_lock(&genpd->lock); |
698 | } |
699 | finish_wait(&genpd->status_wait_queue, &wait); |
700 | __pm_genpd_restore_device(dev->power.subsys_data->domain_data, genpd); |
701 | genpd->resume_count--; |
702 | genpd_set_active(genpd); |
703 | wake_up_all(&genpd->status_wait_queue); |
704 | mutex_unlock(&genpd->lock); |
705 | |
706 | return 0; |
707 | } |
708 | |
709 | /** |
710 | * pm_genpd_poweroff_unused - Power off all PM domains with no devices in use. |
711 | */ |
712 | void pm_genpd_poweroff_unused(void) |
713 | { |
714 | struct generic_pm_domain *genpd; |
715 | |
716 | mutex_lock(&gpd_list_lock); |
717 | |
718 | list_for_each_entry(genpd, &gpd_list, gpd_list_node) |
719 | genpd_queue_power_off_work(genpd); |
720 | |
721 | mutex_unlock(&gpd_list_lock); |
722 | } |
723 | |
724 | #else |
725 | |
726 | static inline int genpd_dev_pm_qos_notifier(struct notifier_block *nb, |
727 | unsigned long val, void *ptr) |
728 | { |
729 | return NOTIFY_DONE; |
730 | } |
731 | |
732 | static inline void genpd_power_off_work_fn(struct work_struct *work) {} |
733 | |
734 | #define pm_genpd_runtime_suspend NULL |
735 | #define pm_genpd_runtime_resume NULL |
736 | |
737 | #endif /* CONFIG_PM_RUNTIME */ |
738 | |
739 | #ifdef CONFIG_PM_SLEEP |
740 | |
741 | /** |
742 | * pm_genpd_present - Check if the given PM domain has been initialized. |
743 | * @genpd: PM domain to check. |
744 | */ |
745 | static bool pm_genpd_present(struct generic_pm_domain *genpd) |
746 | { |
747 | struct generic_pm_domain *gpd; |
748 | |
749 | if (IS_ERR_OR_NULL(genpd)) |
750 | return false; |
751 | |
752 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) |
753 | if (gpd == genpd) |
754 | return true; |
755 | |
756 | return false; |
757 | } |
758 | |
759 | static bool genpd_dev_active_wakeup(struct generic_pm_domain *genpd, |
760 | struct device *dev) |
761 | { |
762 | return GENPD_DEV_CALLBACK(genpd, bool, active_wakeup, dev); |
763 | } |
764 | |
765 | static int genpd_suspend_dev(struct generic_pm_domain *genpd, struct device *dev) |
766 | { |
767 | return GENPD_DEV_CALLBACK(genpd, int, suspend, dev); |
768 | } |
769 | |
770 | static int genpd_suspend_late(struct generic_pm_domain *genpd, struct device *dev) |
771 | { |
772 | return GENPD_DEV_CALLBACK(genpd, int, suspend_late, dev); |
773 | } |
774 | |
775 | static int genpd_resume_early(struct generic_pm_domain *genpd, struct device *dev) |
776 | { |
777 | return GENPD_DEV_CALLBACK(genpd, int, resume_early, dev); |
778 | } |
779 | |
780 | static int genpd_resume_dev(struct generic_pm_domain *genpd, struct device *dev) |
781 | { |
782 | return GENPD_DEV_CALLBACK(genpd, int, resume, dev); |
783 | } |
784 | |
785 | static int genpd_freeze_dev(struct generic_pm_domain *genpd, struct device *dev) |
786 | { |
787 | return GENPD_DEV_CALLBACK(genpd, int, freeze, dev); |
788 | } |
789 | |
790 | static int genpd_freeze_late(struct generic_pm_domain *genpd, struct device *dev) |
791 | { |
792 | return GENPD_DEV_CALLBACK(genpd, int, freeze_late, dev); |
793 | } |
794 | |
795 | static int genpd_thaw_early(struct generic_pm_domain *genpd, struct device *dev) |
796 | { |
797 | return GENPD_DEV_CALLBACK(genpd, int, thaw_early, dev); |
798 | } |
799 | |
800 | static int genpd_thaw_dev(struct generic_pm_domain *genpd, struct device *dev) |
801 | { |
802 | return GENPD_DEV_CALLBACK(genpd, int, thaw, dev); |
803 | } |
804 | |
805 | /** |
806 | * pm_genpd_sync_poweroff - Synchronously power off a PM domain and its masters. |
807 | * @genpd: PM domain to power off, if possible. |
808 | * |
809 | * Check if the given PM domain can be powered off (during system suspend or |
810 | * hibernation) and do that if so. Also, in that case propagate to its masters. |
811 | * |
812 | * This function is only called in "noirq" and "syscore" stages of system power |
813 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are |
814 | * executed sequentially, so it is guaranteed that it will never run twice in |
815 | * parallel). |
816 | */ |
817 | static void pm_genpd_sync_poweroff(struct generic_pm_domain *genpd) |
818 | { |
819 | struct gpd_link *link; |
820 | |
821 | if (genpd->status == GPD_STATE_POWER_OFF) |
822 | return; |
823 | |
824 | if (genpd->suspended_count != genpd->device_count |
825 | || atomic_read(&genpd->sd_count) > 0) |
826 | return; |
827 | |
828 | if (genpd->power_off) |
829 | genpd->power_off(genpd); |
830 | |
831 | genpd->status = GPD_STATE_POWER_OFF; |
832 | |
833 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
834 | genpd_sd_counter_dec(link->master); |
835 | pm_genpd_sync_poweroff(link->master); |
836 | } |
837 | } |
838 | |
839 | /** |
840 | * pm_genpd_sync_poweron - Synchronously power on a PM domain and its masters. |
841 | * @genpd: PM domain to power on. |
842 | * |
843 | * This function is only called in "noirq" and "syscore" stages of system power |
844 | * transitions, so it need not acquire locks (all of the "noirq" callbacks are |
845 | * executed sequentially, so it is guaranteed that it will never run twice in |
846 | * parallel). |
847 | */ |
848 | static void pm_genpd_sync_poweron(struct generic_pm_domain *genpd) |
849 | { |
850 | struct gpd_link *link; |
851 | |
852 | if (genpd->status != GPD_STATE_POWER_OFF) |
853 | return; |
854 | |
855 | list_for_each_entry(link, &genpd->slave_links, slave_node) { |
856 | pm_genpd_sync_poweron(link->master); |
857 | genpd_sd_counter_inc(link->master); |
858 | } |
859 | |
860 | if (genpd->power_on) |
861 | genpd->power_on(genpd); |
862 | |
863 | genpd->status = GPD_STATE_ACTIVE; |
864 | } |
865 | |
866 | /** |
867 | * resume_needed - Check whether to resume a device before system suspend. |
868 | * @dev: Device to check. |
869 | * @genpd: PM domain the device belongs to. |
870 | * |
871 | * There are two cases in which a device that can wake up the system from sleep |
872 | * states should be resumed by pm_genpd_prepare(): (1) if the device is enabled |
873 | * to wake up the system and it has to remain active for this purpose while the |
874 | * system is in the sleep state and (2) if the device is not enabled to wake up |
875 | * the system from sleep states and it generally doesn't generate wakeup signals |
876 | * by itself (those signals are generated on its behalf by other parts of the |
877 | * system). In the latter case it may be necessary to reconfigure the device's |
878 | * wakeup settings during system suspend, because it may have been set up to |
879 | * signal remote wakeup from the system's working state as needed by runtime PM. |
880 | * Return 'true' in either of the above cases. |
881 | */ |
882 | static bool resume_needed(struct device *dev, struct generic_pm_domain *genpd) |
883 | { |
884 | bool active_wakeup; |
885 | |
886 | if (!device_can_wakeup(dev)) |
887 | return false; |
888 | |
889 | active_wakeup = genpd_dev_active_wakeup(genpd, dev); |
890 | return device_may_wakeup(dev) ? active_wakeup : !active_wakeup; |
891 | } |
892 | |
893 | /** |
894 | * pm_genpd_prepare - Start power transition of a device in a PM domain. |
895 | * @dev: Device to start the transition of. |
896 | * |
897 | * Start a power transition of a device (during a system-wide power transition) |
898 | * under the assumption that its pm_domain field points to the domain member of |
899 | * an object of type struct generic_pm_domain representing a PM domain |
900 | * consisting of I/O devices. |
901 | */ |
902 | static int pm_genpd_prepare(struct device *dev) |
903 | { |
904 | struct generic_pm_domain *genpd; |
905 | int ret; |
906 | |
907 | dev_dbg(dev, "%s()\n", __func__); |
908 | |
909 | genpd = dev_to_genpd(dev); |
910 | if (IS_ERR(genpd)) |
911 | return -EINVAL; |
912 | |
913 | /* |
914 | * If a wakeup request is pending for the device, it should be woken up |
915 | * at this point and a system wakeup event should be reported if it's |
916 | * set up to wake up the system from sleep states. |
917 | */ |
918 | pm_runtime_get_noresume(dev); |
919 | if (pm_runtime_barrier(dev) && device_may_wakeup(dev)) |
920 | pm_wakeup_event(dev, 0); |
921 | |
922 | if (pm_wakeup_pending()) { |
923 | pm_runtime_put_sync(dev); |
924 | return -EBUSY; |
925 | } |
926 | |
927 | if (resume_needed(dev, genpd)) |
928 | pm_runtime_resume(dev); |
929 | |
930 | genpd_acquire_lock(genpd); |
931 | |
932 | if (genpd->prepared_count++ == 0) { |
933 | genpd->suspended_count = 0; |
934 | genpd->suspend_power_off = genpd->status == GPD_STATE_POWER_OFF; |
935 | } |
936 | |
937 | genpd_release_lock(genpd); |
938 | |
939 | if (genpd->suspend_power_off) { |
940 | pm_runtime_put_noidle(dev); |
941 | return 0; |
942 | } |
943 | |
944 | /* |
945 | * The PM domain must be in the GPD_STATE_ACTIVE state at this point, |
946 | * so pm_genpd_poweron() will return immediately, but if the device |
947 | * is suspended (e.g. it's been stopped by genpd_stop_dev()), we need |
948 | * to make it operational. |
949 | */ |
950 | pm_runtime_resume(dev); |
951 | __pm_runtime_disable(dev, false); |
952 | |
953 | ret = pm_generic_prepare(dev); |
954 | if (ret) { |
955 | mutex_lock(&genpd->lock); |
956 | |
957 | if (--genpd->prepared_count == 0) |
958 | genpd->suspend_power_off = false; |
959 | |
960 | mutex_unlock(&genpd->lock); |
961 | pm_runtime_enable(dev); |
962 | } |
963 | |
964 | pm_runtime_put_sync(dev); |
965 | return ret; |
966 | } |
967 | |
968 | /** |
969 | * pm_genpd_suspend - Suspend a device belonging to an I/O PM domain. |
970 | * @dev: Device to suspend. |
971 | * |
972 | * Suspend a device under the assumption that its pm_domain field points to the |
973 | * domain member of an object of type struct generic_pm_domain representing |
974 | * a PM domain consisting of I/O devices. |
975 | */ |
976 | static int pm_genpd_suspend(struct device *dev) |
977 | { |
978 | struct generic_pm_domain *genpd; |
979 | |
980 | dev_dbg(dev, "%s()\n", __func__); |
981 | |
982 | genpd = dev_to_genpd(dev); |
983 | if (IS_ERR(genpd)) |
984 | return -EINVAL; |
985 | |
986 | return genpd->suspend_power_off ? 0 : genpd_suspend_dev(genpd, dev); |
987 | } |
988 | |
989 | /** |
990 | * pm_genpd_suspend_late - Late suspend of a device from an I/O PM domain. |
991 | * @dev: Device to suspend. |
992 | * |
993 | * Carry out a late suspend of a device under the assumption that its |
994 | * pm_domain field points to the domain member of an object of type |
995 | * struct generic_pm_domain representing a PM domain consisting of I/O devices. |
996 | */ |
997 | static int pm_genpd_suspend_late(struct device *dev) |
998 | { |
999 | struct generic_pm_domain *genpd; |
1000 | |
1001 | dev_dbg(dev, "%s()\n", __func__); |
1002 | |
1003 | genpd = dev_to_genpd(dev); |
1004 | if (IS_ERR(genpd)) |
1005 | return -EINVAL; |
1006 | |
1007 | return genpd->suspend_power_off ? 0 : genpd_suspend_late(genpd, dev); |
1008 | } |
1009 | |
1010 | /** |
1011 | * pm_genpd_suspend_noirq - Completion of suspend of device in an I/O PM domain. |
1012 | * @dev: Device to suspend. |
1013 | * |
1014 | * Stop the device and remove power from the domain if all devices in it have |
1015 | * been stopped. |
1016 | */ |
1017 | static int pm_genpd_suspend_noirq(struct device *dev) |
1018 | { |
1019 | struct generic_pm_domain *genpd; |
1020 | |
1021 | dev_dbg(dev, "%s()\n", __func__); |
1022 | |
1023 | genpd = dev_to_genpd(dev); |
1024 | if (IS_ERR(genpd)) |
1025 | return -EINVAL; |
1026 | |
1027 | if (genpd->suspend_power_off |
1028 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
1029 | return 0; |
1030 | |
1031 | genpd_stop_dev(genpd, dev); |
1032 | |
1033 | /* |
1034 | * Since all of the "noirq" callbacks are executed sequentially, it is |
1035 | * guaranteed that this function will never run twice in parallel for |
1036 | * the same PM domain, so it is not necessary to use locking here. |
1037 | */ |
1038 | genpd->suspended_count++; |
1039 | pm_genpd_sync_poweroff(genpd); |
1040 | |
1041 | return 0; |
1042 | } |
1043 | |
1044 | /** |
1045 | * pm_genpd_resume_noirq - Start of resume of device in an I/O PM domain. |
1046 | * @dev: Device to resume. |
1047 | * |
1048 | * Restore power to the device's PM domain, if necessary, and start the device. |
1049 | */ |
1050 | static int pm_genpd_resume_noirq(struct device *dev) |
1051 | { |
1052 | struct generic_pm_domain *genpd; |
1053 | |
1054 | dev_dbg(dev, "%s()\n", __func__); |
1055 | |
1056 | genpd = dev_to_genpd(dev); |
1057 | if (IS_ERR(genpd)) |
1058 | return -EINVAL; |
1059 | |
1060 | if (genpd->suspend_power_off |
1061 | || (dev->power.wakeup_path && genpd_dev_active_wakeup(genpd, dev))) |
1062 | return 0; |
1063 | |
1064 | /* |
1065 | * Since all of the "noirq" callbacks are executed sequentially, it is |
1066 | * guaranteed that this function will never run twice in parallel for |
1067 | * the same PM domain, so it is not necessary to use locking here. |
1068 | */ |
1069 | pm_genpd_sync_poweron(genpd); |
1070 | genpd->suspended_count--; |
1071 | |
1072 | return genpd_start_dev(genpd, dev); |
1073 | } |
1074 | |
1075 | /** |
1076 | * pm_genpd_resume_early - Early resume of a device in an I/O PM domain. |
1077 | * @dev: Device to resume. |
1078 | * |
1079 | * Carry out an early resume of a device under the assumption that its |
1080 | * pm_domain field points to the domain member of an object of type |
1081 | * struct generic_pm_domain representing a power domain consisting of I/O |
1082 | * devices. |
1083 | */ |
1084 | static int pm_genpd_resume_early(struct device *dev) |
1085 | { |
1086 | struct generic_pm_domain *genpd; |
1087 | |
1088 | dev_dbg(dev, "%s()\n", __func__); |
1089 | |
1090 | genpd = dev_to_genpd(dev); |
1091 | if (IS_ERR(genpd)) |
1092 | return -EINVAL; |
1093 | |
1094 | return genpd->suspend_power_off ? 0 : genpd_resume_early(genpd, dev); |
1095 | } |
1096 | |
1097 | /** |
1098 | * pm_genpd_resume - Resume of device in an I/O PM domain. |
1099 | * @dev: Device to resume. |
1100 | * |
1101 | * Resume a device under the assumption that its pm_domain field points to the |
1102 | * domain member of an object of type struct generic_pm_domain representing |
1103 | * a power domain consisting of I/O devices. |
1104 | */ |
1105 | static int pm_genpd_resume(struct device *dev) |
1106 | { |
1107 | struct generic_pm_domain *genpd; |
1108 | |
1109 | dev_dbg(dev, "%s()\n", __func__); |
1110 | |
1111 | genpd = dev_to_genpd(dev); |
1112 | if (IS_ERR(genpd)) |
1113 | return -EINVAL; |
1114 | |
1115 | return genpd->suspend_power_off ? 0 : genpd_resume_dev(genpd, dev); |
1116 | } |
1117 | |
1118 | /** |
1119 | * pm_genpd_freeze - Freezing a device in an I/O PM domain. |
1120 | * @dev: Device to freeze. |
1121 | * |
1122 | * Freeze a device under the assumption that its pm_domain field points to the |
1123 | * domain member of an object of type struct generic_pm_domain representing |
1124 | * a power domain consisting of I/O devices. |
1125 | */ |
1126 | static int pm_genpd_freeze(struct device *dev) |
1127 | { |
1128 | struct generic_pm_domain *genpd; |
1129 | |
1130 | dev_dbg(dev, "%s()\n", __func__); |
1131 | |
1132 | genpd = dev_to_genpd(dev); |
1133 | if (IS_ERR(genpd)) |
1134 | return -EINVAL; |
1135 | |
1136 | return genpd->suspend_power_off ? 0 : genpd_freeze_dev(genpd, dev); |
1137 | } |
1138 | |
1139 | /** |
1140 | * pm_genpd_freeze_late - Late freeze of a device in an I/O PM domain. |
1141 | * @dev: Device to freeze. |
1142 | * |
1143 | * Carry out a late freeze of a device under the assumption that its |
1144 | * pm_domain field points to the domain member of an object of type |
1145 | * struct generic_pm_domain representing a power domain consisting of I/O |
1146 | * devices. |
1147 | */ |
1148 | static int pm_genpd_freeze_late(struct device *dev) |
1149 | { |
1150 | struct generic_pm_domain *genpd; |
1151 | |
1152 | dev_dbg(dev, "%s()\n", __func__); |
1153 | |
1154 | genpd = dev_to_genpd(dev); |
1155 | if (IS_ERR(genpd)) |
1156 | return -EINVAL; |
1157 | |
1158 | return genpd->suspend_power_off ? 0 : genpd_freeze_late(genpd, dev); |
1159 | } |
1160 | |
1161 | /** |
1162 | * pm_genpd_freeze_noirq - Completion of freezing a device in an I/O PM domain. |
1163 | * @dev: Device to freeze. |
1164 | * |
1165 | * Carry out a late freeze of a device under the assumption that its |
1166 | * pm_domain field points to the domain member of an object of type |
1167 | * struct generic_pm_domain representing a power domain consisting of I/O |
1168 | * devices. |
1169 | */ |
1170 | static int pm_genpd_freeze_noirq(struct device *dev) |
1171 | { |
1172 | struct generic_pm_domain *genpd; |
1173 | |
1174 | dev_dbg(dev, "%s()\n", __func__); |
1175 | |
1176 | genpd = dev_to_genpd(dev); |
1177 | if (IS_ERR(genpd)) |
1178 | return -EINVAL; |
1179 | |
1180 | return genpd->suspend_power_off ? 0 : genpd_stop_dev(genpd, dev); |
1181 | } |
1182 | |
1183 | /** |
1184 | * pm_genpd_thaw_noirq - Early thaw of device in an I/O PM domain. |
1185 | * @dev: Device to thaw. |
1186 | * |
1187 | * Start the device, unless power has been removed from the domain already |
1188 | * before the system transition. |
1189 | */ |
1190 | static int pm_genpd_thaw_noirq(struct device *dev) |
1191 | { |
1192 | struct generic_pm_domain *genpd; |
1193 | |
1194 | dev_dbg(dev, "%s()\n", __func__); |
1195 | |
1196 | genpd = dev_to_genpd(dev); |
1197 | if (IS_ERR(genpd)) |
1198 | return -EINVAL; |
1199 | |
1200 | return genpd->suspend_power_off ? 0 : genpd_start_dev(genpd, dev); |
1201 | } |
1202 | |
1203 | /** |
1204 | * pm_genpd_thaw_early - Early thaw of device in an I/O PM domain. |
1205 | * @dev: Device to thaw. |
1206 | * |
1207 | * Carry out an early thaw of a device under the assumption that its |
1208 | * pm_domain field points to the domain member of an object of type |
1209 | * struct generic_pm_domain representing a power domain consisting of I/O |
1210 | * devices. |
1211 | */ |
1212 | static int pm_genpd_thaw_early(struct device *dev) |
1213 | { |
1214 | struct generic_pm_domain *genpd; |
1215 | |
1216 | dev_dbg(dev, "%s()\n", __func__); |
1217 | |
1218 | genpd = dev_to_genpd(dev); |
1219 | if (IS_ERR(genpd)) |
1220 | return -EINVAL; |
1221 | |
1222 | return genpd->suspend_power_off ? 0 : genpd_thaw_early(genpd, dev); |
1223 | } |
1224 | |
1225 | /** |
1226 | * pm_genpd_thaw - Thaw a device belonging to an I/O power domain. |
1227 | * @dev: Device to thaw. |
1228 | * |
1229 | * Thaw a device under the assumption that its pm_domain field points to the |
1230 | * domain member of an object of type struct generic_pm_domain representing |
1231 | * a power domain consisting of I/O devices. |
1232 | */ |
1233 | static int pm_genpd_thaw(struct device *dev) |
1234 | { |
1235 | struct generic_pm_domain *genpd; |
1236 | |
1237 | dev_dbg(dev, "%s()\n", __func__); |
1238 | |
1239 | genpd = dev_to_genpd(dev); |
1240 | if (IS_ERR(genpd)) |
1241 | return -EINVAL; |
1242 | |
1243 | return genpd->suspend_power_off ? 0 : genpd_thaw_dev(genpd, dev); |
1244 | } |
1245 | |
1246 | /** |
1247 | * pm_genpd_restore_noirq - Start of restore of device in an I/O PM domain. |
1248 | * @dev: Device to resume. |
1249 | * |
1250 | * Make sure the domain will be in the same power state as before the |
1251 | * hibernation the system is resuming from and start the device if necessary. |
1252 | */ |
1253 | static int pm_genpd_restore_noirq(struct device *dev) |
1254 | { |
1255 | struct generic_pm_domain *genpd; |
1256 | |
1257 | dev_dbg(dev, "%s()\n", __func__); |
1258 | |
1259 | genpd = dev_to_genpd(dev); |
1260 | if (IS_ERR(genpd)) |
1261 | return -EINVAL; |
1262 | |
1263 | /* |
1264 | * Since all of the "noirq" callbacks are executed sequentially, it is |
1265 | * guaranteed that this function will never run twice in parallel for |
1266 | * the same PM domain, so it is not necessary to use locking here. |
1267 | * |
1268 | * At this point suspended_count == 0 means we are being run for the |
1269 | * first time for the given domain in the present cycle. |
1270 | */ |
1271 | if (genpd->suspended_count++ == 0) { |
1272 | /* |
1273 | * The boot kernel might put the domain into arbitrary state, |
1274 | * so make it appear as powered off to pm_genpd_sync_poweron(), |
1275 | * so that it tries to power it on in case it was really off. |
1276 | */ |
1277 | genpd->status = GPD_STATE_POWER_OFF; |
1278 | if (genpd->suspend_power_off) { |
1279 | /* |
1280 | * If the domain was off before the hibernation, make |
1281 | * sure it will be off going forward. |
1282 | */ |
1283 | if (genpd->power_off) |
1284 | genpd->power_off(genpd); |
1285 | |
1286 | return 0; |
1287 | } |
1288 | } |
1289 | |
1290 | if (genpd->suspend_power_off) |
1291 | return 0; |
1292 | |
1293 | pm_genpd_sync_poweron(genpd); |
1294 | |
1295 | return genpd_start_dev(genpd, dev); |
1296 | } |
1297 | |
1298 | /** |
1299 | * pm_genpd_complete - Complete power transition of a device in a power domain. |
1300 | * @dev: Device to complete the transition of. |
1301 | * |
1302 | * Complete a power transition of a device (during a system-wide power |
1303 | * transition) under the assumption that its pm_domain field points to the |
1304 | * domain member of an object of type struct generic_pm_domain representing |
1305 | * a power domain consisting of I/O devices. |
1306 | */ |
1307 | static void pm_genpd_complete(struct device *dev) |
1308 | { |
1309 | struct generic_pm_domain *genpd; |
1310 | bool run_complete; |
1311 | |
1312 | dev_dbg(dev, "%s()\n", __func__); |
1313 | |
1314 | genpd = dev_to_genpd(dev); |
1315 | if (IS_ERR(genpd)) |
1316 | return; |
1317 | |
1318 | mutex_lock(&genpd->lock); |
1319 | |
1320 | run_complete = !genpd->suspend_power_off; |
1321 | if (--genpd->prepared_count == 0) |
1322 | genpd->suspend_power_off = false; |
1323 | |
1324 | mutex_unlock(&genpd->lock); |
1325 | |
1326 | if (run_complete) { |
1327 | pm_generic_complete(dev); |
1328 | pm_runtime_set_active(dev); |
1329 | pm_runtime_enable(dev); |
1330 | pm_runtime_idle(dev); |
1331 | } |
1332 | } |
1333 | |
1334 | /** |
1335 | * pm_genpd_syscore_switch - Switch power during system core suspend or resume. |
1336 | * @dev: Device that normally is marked as "always on" to switch power for. |
1337 | * |
1338 | * This routine may only be called during the system core (syscore) suspend or |
1339 | * resume phase for devices whose "always on" flags are set. |
1340 | */ |
1341 | void pm_genpd_syscore_switch(struct device *dev, bool suspend) |
1342 | { |
1343 | struct generic_pm_domain *genpd; |
1344 | |
1345 | genpd = dev_to_genpd(dev); |
1346 | if (!pm_genpd_present(genpd)) |
1347 | return; |
1348 | |
1349 | if (suspend) { |
1350 | genpd->suspended_count++; |
1351 | pm_genpd_sync_poweroff(genpd); |
1352 | } else { |
1353 | pm_genpd_sync_poweron(genpd); |
1354 | genpd->suspended_count--; |
1355 | } |
1356 | } |
1357 | EXPORT_SYMBOL_GPL(pm_genpd_syscore_switch); |
1358 | |
1359 | #else |
1360 | |
1361 | #define pm_genpd_prepare NULL |
1362 | #define pm_genpd_suspend NULL |
1363 | #define pm_genpd_suspend_late NULL |
1364 | #define pm_genpd_suspend_noirq NULL |
1365 | #define pm_genpd_resume_early NULL |
1366 | #define pm_genpd_resume_noirq NULL |
1367 | #define pm_genpd_resume NULL |
1368 | #define pm_genpd_freeze NULL |
1369 | #define pm_genpd_freeze_late NULL |
1370 | #define pm_genpd_freeze_noirq NULL |
1371 | #define pm_genpd_thaw_early NULL |
1372 | #define pm_genpd_thaw_noirq NULL |
1373 | #define pm_genpd_thaw NULL |
1374 | #define pm_genpd_restore_noirq NULL |
1375 | #define pm_genpd_complete NULL |
1376 | |
1377 | #endif /* CONFIG_PM_SLEEP */ |
1378 | |
1379 | static struct generic_pm_domain_data *__pm_genpd_alloc_dev_data(struct device *dev) |
1380 | { |
1381 | struct generic_pm_domain_data *gpd_data; |
1382 | |
1383 | gpd_data = kzalloc(sizeof(*gpd_data), GFP_KERNEL); |
1384 | if (!gpd_data) |
1385 | return NULL; |
1386 | |
1387 | mutex_init(&gpd_data->lock); |
1388 | gpd_data->nb.notifier_call = genpd_dev_pm_qos_notifier; |
1389 | dev_pm_qos_add_notifier(dev, &gpd_data->nb); |
1390 | return gpd_data; |
1391 | } |
1392 | |
1393 | static void __pm_genpd_free_dev_data(struct device *dev, |
1394 | struct generic_pm_domain_data *gpd_data) |
1395 | { |
1396 | dev_pm_qos_remove_notifier(dev, &gpd_data->nb); |
1397 | kfree(gpd_data); |
1398 | } |
1399 | |
1400 | /** |
1401 | * __pm_genpd_add_device - Add a device to an I/O PM domain. |
1402 | * @genpd: PM domain to add the device to. |
1403 | * @dev: Device to be added. |
1404 | * @td: Set of PM QoS timing parameters to attach to the device. |
1405 | */ |
1406 | int __pm_genpd_add_device(struct generic_pm_domain *genpd, struct device *dev, |
1407 | struct gpd_timing_data *td) |
1408 | { |
1409 | struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL; |
1410 | struct pm_domain_data *pdd; |
1411 | int ret = 0; |
1412 | |
1413 | dev_dbg(dev, "%s()\n", __func__); |
1414 | |
1415 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev)) |
1416 | return -EINVAL; |
1417 | |
1418 | gpd_data_new = __pm_genpd_alloc_dev_data(dev); |
1419 | if (!gpd_data_new) |
1420 | return -ENOMEM; |
1421 | |
1422 | genpd_acquire_lock(genpd); |
1423 | |
1424 | if (genpd->prepared_count > 0) { |
1425 | ret = -EAGAIN; |
1426 | goto out; |
1427 | } |
1428 | |
1429 | list_for_each_entry(pdd, &genpd->dev_list, list_node) |
1430 | if (pdd->dev == dev) { |
1431 | ret = -EINVAL; |
1432 | goto out; |
1433 | } |
1434 | |
1435 | ret = dev_pm_get_subsys_data(dev); |
1436 | if (ret) |
1437 | goto out; |
1438 | |
1439 | genpd->device_count++; |
1440 | genpd->max_off_time_changed = true; |
1441 | |
1442 | spin_lock_irq(&dev->power.lock); |
1443 | |
1444 | dev->pm_domain = &genpd->domain; |
1445 | if (dev->power.subsys_data->domain_data) { |
1446 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); |
1447 | } else { |
1448 | gpd_data = gpd_data_new; |
1449 | dev->power.subsys_data->domain_data = &gpd_data->base; |
1450 | } |
1451 | gpd_data->refcount++; |
1452 | if (td) |
1453 | gpd_data->td = *td; |
1454 | |
1455 | spin_unlock_irq(&dev->power.lock); |
1456 | |
1457 | mutex_lock(&gpd_data->lock); |
1458 | gpd_data->base.dev = dev; |
1459 | list_add_tail(&gpd_data->base.list_node, &genpd->dev_list); |
1460 | gpd_data->need_restore = genpd->status == GPD_STATE_POWER_OFF; |
1461 | gpd_data->td.constraint_changed = true; |
1462 | gpd_data->td.effective_constraint_ns = -1; |
1463 | mutex_unlock(&gpd_data->lock); |
1464 | |
1465 | out: |
1466 | genpd_release_lock(genpd); |
1467 | |
1468 | if (gpd_data != gpd_data_new) |
1469 | __pm_genpd_free_dev_data(dev, gpd_data_new); |
1470 | |
1471 | return ret; |
1472 | } |
1473 | |
1474 | /** |
1475 | * __pm_genpd_of_add_device - Add a device to an I/O PM domain. |
1476 | * @genpd_node: Device tree node pointer representing a PM domain to which the |
1477 | * the device is added to. |
1478 | * @dev: Device to be added. |
1479 | * @td: Set of PM QoS timing parameters to attach to the device. |
1480 | */ |
1481 | int __pm_genpd_of_add_device(struct device_node *genpd_node, struct device *dev, |
1482 | struct gpd_timing_data *td) |
1483 | { |
1484 | struct generic_pm_domain *genpd = NULL, *gpd; |
1485 | |
1486 | dev_dbg(dev, "%s()\n", __func__); |
1487 | |
1488 | if (IS_ERR_OR_NULL(genpd_node) || IS_ERR_OR_NULL(dev)) |
1489 | return -EINVAL; |
1490 | |
1491 | mutex_lock(&gpd_list_lock); |
1492 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
1493 | if (gpd->of_node == genpd_node) { |
1494 | genpd = gpd; |
1495 | break; |
1496 | } |
1497 | } |
1498 | mutex_unlock(&gpd_list_lock); |
1499 | |
1500 | if (!genpd) |
1501 | return -EINVAL; |
1502 | |
1503 | return __pm_genpd_add_device(genpd, dev, td); |
1504 | } |
1505 | |
1506 | |
1507 | /** |
1508 | * __pm_genpd_name_add_device - Find I/O PM domain and add a device to it. |
1509 | * @domain_name: Name of the PM domain to add the device to. |
1510 | * @dev: Device to be added. |
1511 | * @td: Set of PM QoS timing parameters to attach to the device. |
1512 | */ |
1513 | int __pm_genpd_name_add_device(const char *domain_name, struct device *dev, |
1514 | struct gpd_timing_data *td) |
1515 | { |
1516 | return __pm_genpd_add_device(pm_genpd_lookup_name(domain_name), dev, td); |
1517 | } |
1518 | |
1519 | /** |
1520 | * pm_genpd_remove_device - Remove a device from an I/O PM domain. |
1521 | * @genpd: PM domain to remove the device from. |
1522 | * @dev: Device to be removed. |
1523 | */ |
1524 | int pm_genpd_remove_device(struct generic_pm_domain *genpd, |
1525 | struct device *dev) |
1526 | { |
1527 | struct generic_pm_domain_data *gpd_data; |
1528 | struct pm_domain_data *pdd; |
1529 | bool remove = false; |
1530 | int ret = 0; |
1531 | |
1532 | dev_dbg(dev, "%s()\n", __func__); |
1533 | |
1534 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(dev) |
1535 | || IS_ERR_OR_NULL(dev->pm_domain) |
1536 | || pd_to_genpd(dev->pm_domain) != genpd) |
1537 | return -EINVAL; |
1538 | |
1539 | genpd_acquire_lock(genpd); |
1540 | |
1541 | if (genpd->prepared_count > 0) { |
1542 | ret = -EAGAIN; |
1543 | goto out; |
1544 | } |
1545 | |
1546 | genpd->device_count--; |
1547 | genpd->max_off_time_changed = true; |
1548 | |
1549 | spin_lock_irq(&dev->power.lock); |
1550 | |
1551 | dev->pm_domain = NULL; |
1552 | pdd = dev->power.subsys_data->domain_data; |
1553 | list_del_init(&pdd->list_node); |
1554 | gpd_data = to_gpd_data(pdd); |
1555 | if (--gpd_data->refcount == 0) { |
1556 | dev->power.subsys_data->domain_data = NULL; |
1557 | remove = true; |
1558 | } |
1559 | |
1560 | spin_unlock_irq(&dev->power.lock); |
1561 | |
1562 | mutex_lock(&gpd_data->lock); |
1563 | pdd->dev = NULL; |
1564 | mutex_unlock(&gpd_data->lock); |
1565 | |
1566 | genpd_release_lock(genpd); |
1567 | |
1568 | dev_pm_put_subsys_data(dev); |
1569 | if (remove) |
1570 | __pm_genpd_free_dev_data(dev, gpd_data); |
1571 | |
1572 | return 0; |
1573 | |
1574 | out: |
1575 | genpd_release_lock(genpd); |
1576 | |
1577 | return ret; |
1578 | } |
1579 | |
1580 | /** |
1581 | * pm_genpd_dev_need_restore - Set/unset the device's "need restore" flag. |
1582 | * @dev: Device to set/unset the flag for. |
1583 | * @val: The new value of the device's "need restore" flag. |
1584 | */ |
1585 | void pm_genpd_dev_need_restore(struct device *dev, bool val) |
1586 | { |
1587 | struct pm_subsys_data *psd; |
1588 | unsigned long flags; |
1589 | |
1590 | spin_lock_irqsave(&dev->power.lock, flags); |
1591 | |
1592 | psd = dev_to_psd(dev); |
1593 | if (psd && psd->domain_data) |
1594 | to_gpd_data(psd->domain_data)->need_restore = val; |
1595 | |
1596 | spin_unlock_irqrestore(&dev->power.lock, flags); |
1597 | } |
1598 | EXPORT_SYMBOL_GPL(pm_genpd_dev_need_restore); |
1599 | |
1600 | /** |
1601 | * pm_genpd_add_subdomain - Add a subdomain to an I/O PM domain. |
1602 | * @genpd: Master PM domain to add the subdomain to. |
1603 | * @subdomain: Subdomain to be added. |
1604 | */ |
1605 | int pm_genpd_add_subdomain(struct generic_pm_domain *genpd, |
1606 | struct generic_pm_domain *subdomain) |
1607 | { |
1608 | struct gpd_link *link; |
1609 | int ret = 0; |
1610 | |
1611 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain) |
1612 | || genpd == subdomain) |
1613 | return -EINVAL; |
1614 | |
1615 | start: |
1616 | genpd_acquire_lock(genpd); |
1617 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
1618 | |
1619 | if (subdomain->status != GPD_STATE_POWER_OFF |
1620 | && subdomain->status != GPD_STATE_ACTIVE) { |
1621 | mutex_unlock(&subdomain->lock); |
1622 | genpd_release_lock(genpd); |
1623 | goto start; |
1624 | } |
1625 | |
1626 | if (genpd->status == GPD_STATE_POWER_OFF |
1627 | && subdomain->status != GPD_STATE_POWER_OFF) { |
1628 | ret = -EINVAL; |
1629 | goto out; |
1630 | } |
1631 | |
1632 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1633 | if (link->slave == subdomain && link->master == genpd) { |
1634 | ret = -EINVAL; |
1635 | goto out; |
1636 | } |
1637 | } |
1638 | |
1639 | link = kzalloc(sizeof(*link), GFP_KERNEL); |
1640 | if (!link) { |
1641 | ret = -ENOMEM; |
1642 | goto out; |
1643 | } |
1644 | link->master = genpd; |
1645 | list_add_tail(&link->master_node, &genpd->master_links); |
1646 | link->slave = subdomain; |
1647 | list_add_tail(&link->slave_node, &subdomain->slave_links); |
1648 | if (subdomain->status != GPD_STATE_POWER_OFF) |
1649 | genpd_sd_counter_inc(genpd); |
1650 | |
1651 | out: |
1652 | mutex_unlock(&subdomain->lock); |
1653 | genpd_release_lock(genpd); |
1654 | |
1655 | return ret; |
1656 | } |
1657 | |
1658 | /** |
1659 | * pm_genpd_add_subdomain_names - Add a subdomain to an I/O PM domain. |
1660 | * @master_name: Name of the master PM domain to add the subdomain to. |
1661 | * @subdomain_name: Name of the subdomain to be added. |
1662 | */ |
1663 | int pm_genpd_add_subdomain_names(const char *master_name, |
1664 | const char *subdomain_name) |
1665 | { |
1666 | struct generic_pm_domain *master = NULL, *subdomain = NULL, *gpd; |
1667 | |
1668 | if (IS_ERR_OR_NULL(master_name) || IS_ERR_OR_NULL(subdomain_name)) |
1669 | return -EINVAL; |
1670 | |
1671 | mutex_lock(&gpd_list_lock); |
1672 | list_for_each_entry(gpd, &gpd_list, gpd_list_node) { |
1673 | if (!master && !strcmp(gpd->name, master_name)) |
1674 | master = gpd; |
1675 | |
1676 | if (!subdomain && !strcmp(gpd->name, subdomain_name)) |
1677 | subdomain = gpd; |
1678 | |
1679 | if (master && subdomain) |
1680 | break; |
1681 | } |
1682 | mutex_unlock(&gpd_list_lock); |
1683 | |
1684 | return pm_genpd_add_subdomain(master, subdomain); |
1685 | } |
1686 | |
1687 | /** |
1688 | * pm_genpd_remove_subdomain - Remove a subdomain from an I/O PM domain. |
1689 | * @genpd: Master PM domain to remove the subdomain from. |
1690 | * @subdomain: Subdomain to be removed. |
1691 | */ |
1692 | int pm_genpd_remove_subdomain(struct generic_pm_domain *genpd, |
1693 | struct generic_pm_domain *subdomain) |
1694 | { |
1695 | struct gpd_link *link; |
1696 | int ret = -EINVAL; |
1697 | |
1698 | if (IS_ERR_OR_NULL(genpd) || IS_ERR_OR_NULL(subdomain)) |
1699 | return -EINVAL; |
1700 | |
1701 | start: |
1702 | genpd_acquire_lock(genpd); |
1703 | |
1704 | list_for_each_entry(link, &genpd->master_links, master_node) { |
1705 | if (link->slave != subdomain) |
1706 | continue; |
1707 | |
1708 | mutex_lock_nested(&subdomain->lock, SINGLE_DEPTH_NESTING); |
1709 | |
1710 | if (subdomain->status != GPD_STATE_POWER_OFF |
1711 | && subdomain->status != GPD_STATE_ACTIVE) { |
1712 | mutex_unlock(&subdomain->lock); |
1713 | genpd_release_lock(genpd); |
1714 | goto start; |
1715 | } |
1716 | |
1717 | list_del(&link->master_node); |
1718 | list_del(&link->slave_node); |
1719 | kfree(link); |
1720 | if (subdomain->status != GPD_STATE_POWER_OFF) |
1721 | genpd_sd_counter_dec(genpd); |
1722 | |
1723 | mutex_unlock(&subdomain->lock); |
1724 | |
1725 | ret = 0; |
1726 | break; |
1727 | } |
1728 | |
1729 | genpd_release_lock(genpd); |
1730 | |
1731 | return ret; |
1732 | } |
1733 | |
1734 | /** |
1735 | * pm_genpd_add_callbacks - Add PM domain callbacks to a given device. |
1736 | * @dev: Device to add the callbacks to. |
1737 | * @ops: Set of callbacks to add. |
1738 | * @td: Timing data to add to the device along with the callbacks (optional). |
1739 | * |
1740 | * Every call to this routine should be balanced with a call to |
1741 | * __pm_genpd_remove_callbacks() and they must not be nested. |
1742 | */ |
1743 | int pm_genpd_add_callbacks(struct device *dev, struct gpd_dev_ops *ops, |
1744 | struct gpd_timing_data *td) |
1745 | { |
1746 | struct generic_pm_domain_data *gpd_data_new, *gpd_data = NULL; |
1747 | int ret = 0; |
1748 | |
1749 | if (!(dev && ops)) |
1750 | return -EINVAL; |
1751 | |
1752 | gpd_data_new = __pm_genpd_alloc_dev_data(dev); |
1753 | if (!gpd_data_new) |
1754 | return -ENOMEM; |
1755 | |
1756 | pm_runtime_disable(dev); |
1757 | device_pm_lock(); |
1758 | |
1759 | ret = dev_pm_get_subsys_data(dev); |
1760 | if (ret) |
1761 | goto out; |
1762 | |
1763 | spin_lock_irq(&dev->power.lock); |
1764 | |
1765 | if (dev->power.subsys_data->domain_data) { |
1766 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); |
1767 | } else { |
1768 | gpd_data = gpd_data_new; |
1769 | dev->power.subsys_data->domain_data = &gpd_data->base; |
1770 | } |
1771 | gpd_data->refcount++; |
1772 | gpd_data->ops = *ops; |
1773 | if (td) |
1774 | gpd_data->td = *td; |
1775 | |
1776 | spin_unlock_irq(&dev->power.lock); |
1777 | |
1778 | out: |
1779 | device_pm_unlock(); |
1780 | pm_runtime_enable(dev); |
1781 | |
1782 | if (gpd_data != gpd_data_new) |
1783 | __pm_genpd_free_dev_data(dev, gpd_data_new); |
1784 | |
1785 | return ret; |
1786 | } |
1787 | EXPORT_SYMBOL_GPL(pm_genpd_add_callbacks); |
1788 | |
1789 | /** |
1790 | * __pm_genpd_remove_callbacks - Remove PM domain callbacks from a given device. |
1791 | * @dev: Device to remove the callbacks from. |
1792 | * @clear_td: If set, clear the device's timing data too. |
1793 | * |
1794 | * This routine can only be called after pm_genpd_add_callbacks(). |
1795 | */ |
1796 | int __pm_genpd_remove_callbacks(struct device *dev, bool clear_td) |
1797 | { |
1798 | struct generic_pm_domain_data *gpd_data = NULL; |
1799 | bool remove = false; |
1800 | int ret = 0; |
1801 | |
1802 | if (!(dev && dev->power.subsys_data)) |
1803 | return -EINVAL; |
1804 | |
1805 | pm_runtime_disable(dev); |
1806 | device_pm_lock(); |
1807 | |
1808 | spin_lock_irq(&dev->power.lock); |
1809 | |
1810 | if (dev->power.subsys_data->domain_data) { |
1811 | gpd_data = to_gpd_data(dev->power.subsys_data->domain_data); |
1812 | gpd_data->ops = (struct gpd_dev_ops){ NULL }; |
1813 | if (clear_td) |
1814 | gpd_data->td = (struct gpd_timing_data){ 0 }; |
1815 | |
1816 | if (--gpd_data->refcount == 0) { |
1817 | dev->power.subsys_data->domain_data = NULL; |
1818 | remove = true; |
1819 | } |
1820 | } else { |
1821 | ret = -EINVAL; |
1822 | } |
1823 | |
1824 | spin_unlock_irq(&dev->power.lock); |
1825 | |
1826 | device_pm_unlock(); |
1827 | pm_runtime_enable(dev); |
1828 | |
1829 | if (ret) |
1830 | return ret; |
1831 | |
1832 | dev_pm_put_subsys_data(dev); |
1833 | if (remove) |
1834 | __pm_genpd_free_dev_data(dev, gpd_data); |
1835 | |
1836 | return 0; |
1837 | } |
1838 | EXPORT_SYMBOL_GPL(__pm_genpd_remove_callbacks); |
1839 | |
1840 | /** |
1841 | * pm_genpd_attach_cpuidle - Connect the given PM domain with cpuidle. |
1842 | * @genpd: PM domain to be connected with cpuidle. |
1843 | * @state: cpuidle state this domain can disable/enable. |
1844 | * |
1845 | * Make a PM domain behave as though it contained a CPU core, that is, instead |
1846 | * of calling its power down routine it will enable the given cpuidle state so |
1847 | * that the cpuidle subsystem can power it down (if possible and desirable). |
1848 | */ |
1849 | int pm_genpd_attach_cpuidle(struct generic_pm_domain *genpd, int state) |
1850 | { |
1851 | struct cpuidle_driver *cpuidle_drv; |
1852 | struct gpd_cpu_data *cpu_data; |
1853 | struct cpuidle_state *idle_state; |
1854 | int ret = 0; |
1855 | |
1856 | if (IS_ERR_OR_NULL(genpd) || state < 0) |
1857 | return -EINVAL; |
1858 | |
1859 | genpd_acquire_lock(genpd); |
1860 | |
1861 | if (genpd->cpu_data) { |
1862 | ret = -EEXIST; |
1863 | goto out; |
1864 | } |
1865 | cpu_data = kzalloc(sizeof(*cpu_data), GFP_KERNEL); |
1866 | if (!cpu_data) { |
1867 | ret = -ENOMEM; |
1868 | goto out; |
1869 | } |
1870 | cpuidle_drv = cpuidle_driver_ref(); |
1871 | if (!cpuidle_drv) { |
1872 | ret = -ENODEV; |
1873 | goto err_drv; |
1874 | } |
1875 | if (cpuidle_drv->state_count <= state) { |
1876 | ret = -EINVAL; |
1877 | goto err; |
1878 | } |
1879 | idle_state = &cpuidle_drv->states[state]; |
1880 | if (!idle_state->disabled) { |
1881 | ret = -EAGAIN; |
1882 | goto err; |
1883 | } |
1884 | cpu_data->idle_state = idle_state; |
1885 | cpu_data->saved_exit_latency = idle_state->exit_latency; |
1886 | genpd->cpu_data = cpu_data; |
1887 | genpd_recalc_cpu_exit_latency(genpd); |
1888 | |
1889 | out: |
1890 | genpd_release_lock(genpd); |
1891 | return ret; |
1892 | |
1893 | err: |
1894 | cpuidle_driver_unref(); |
1895 | |
1896 | err_drv: |
1897 | kfree(cpu_data); |
1898 | goto out; |
1899 | } |
1900 | |
1901 | /** |
1902 | * pm_genpd_name_attach_cpuidle - Find PM domain and connect cpuidle to it. |
1903 | * @name: Name of the domain to connect to cpuidle. |
1904 | * @state: cpuidle state this domain can manipulate. |
1905 | */ |
1906 | int pm_genpd_name_attach_cpuidle(const char *name, int state) |
1907 | { |
1908 | return pm_genpd_attach_cpuidle(pm_genpd_lookup_name(name), state); |
1909 | } |
1910 | |
1911 | /** |
1912 | * pm_genpd_detach_cpuidle - Remove the cpuidle connection from a PM domain. |
1913 | * @genpd: PM domain to remove the cpuidle connection from. |
1914 | * |
1915 | * Remove the cpuidle connection set up by pm_genpd_attach_cpuidle() from the |
1916 | * given PM domain. |
1917 | */ |
1918 | int pm_genpd_detach_cpuidle(struct generic_pm_domain *genpd) |
1919 | { |
1920 | struct gpd_cpu_data *cpu_data; |
1921 | struct cpuidle_state *idle_state; |
1922 | int ret = 0; |
1923 | |
1924 | if (IS_ERR_OR_NULL(genpd)) |
1925 | return -EINVAL; |
1926 | |
1927 | genpd_acquire_lock(genpd); |
1928 | |
1929 | cpu_data = genpd->cpu_data; |
1930 | if (!cpu_data) { |
1931 | ret = -ENODEV; |
1932 | goto out; |
1933 | } |
1934 | idle_state = cpu_data->idle_state; |
1935 | if (!idle_state->disabled) { |
1936 | ret = -EAGAIN; |
1937 | goto out; |
1938 | } |
1939 | idle_state->exit_latency = cpu_data->saved_exit_latency; |
1940 | cpuidle_driver_unref(); |
1941 | genpd->cpu_data = NULL; |
1942 | kfree(cpu_data); |
1943 | |
1944 | out: |
1945 | genpd_release_lock(genpd); |
1946 | return ret; |
1947 | } |
1948 | |
1949 | /** |
1950 | * pm_genpd_name_detach_cpuidle - Find PM domain and disconnect cpuidle from it. |
1951 | * @name: Name of the domain to disconnect cpuidle from. |
1952 | */ |
1953 | int pm_genpd_name_detach_cpuidle(const char *name) |
1954 | { |
1955 | return pm_genpd_detach_cpuidle(pm_genpd_lookup_name(name)); |
1956 | } |
1957 | |
1958 | /* Default device callbacks for generic PM domains. */ |
1959 | |
1960 | /** |
1961 | * pm_genpd_default_save_state - Default "save device state" for PM domians. |
1962 | * @dev: Device to handle. |
1963 | */ |
1964 | static int pm_genpd_default_save_state(struct device *dev) |
1965 | { |
1966 | int (*cb)(struct device *__dev); |
1967 | |
1968 | cb = dev_gpd_data(dev)->ops.save_state; |
1969 | if (cb) |
1970 | return cb(dev); |
1971 | |
1972 | if (dev->type && dev->type->pm) |
1973 | cb = dev->type->pm->runtime_suspend; |
1974 | else if (dev->class && dev->class->pm) |
1975 | cb = dev->class->pm->runtime_suspend; |
1976 | else if (dev->bus && dev->bus->pm) |
1977 | cb = dev->bus->pm->runtime_suspend; |
1978 | else |
1979 | cb = NULL; |
1980 | |
1981 | if (!cb && dev->driver && dev->driver->pm) |
1982 | cb = dev->driver->pm->runtime_suspend; |
1983 | |
1984 | return cb ? cb(dev) : 0; |
1985 | } |
1986 | |
1987 | /** |
1988 | * pm_genpd_default_restore_state - Default PM domians "restore device state". |
1989 | * @dev: Device to handle. |
1990 | */ |
1991 | static int pm_genpd_default_restore_state(struct device *dev) |
1992 | { |
1993 | int (*cb)(struct device *__dev); |
1994 | |
1995 | cb = dev_gpd_data(dev)->ops.restore_state; |
1996 | if (cb) |
1997 | return cb(dev); |
1998 | |
1999 | if (dev->type && dev->type->pm) |
2000 | cb = dev->type->pm->runtime_resume; |
2001 | else if (dev->class && dev->class->pm) |
2002 | cb = dev->class->pm->runtime_resume; |
2003 | else if (dev->bus && dev->bus->pm) |
2004 | cb = dev->bus->pm->runtime_resume; |
2005 | else |
2006 | cb = NULL; |
2007 | |
2008 | if (!cb && dev->driver && dev->driver->pm) |
2009 | cb = dev->driver->pm->runtime_resume; |
2010 | |
2011 | return cb ? cb(dev) : 0; |
2012 | } |
2013 | |
2014 | #ifdef CONFIG_PM_SLEEP |
2015 | |
2016 | /** |
2017 | * pm_genpd_default_suspend - Default "device suspend" for PM domians. |
2018 | * @dev: Device to handle. |
2019 | */ |
2020 | static int pm_genpd_default_suspend(struct device *dev) |
2021 | { |
2022 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend; |
2023 | |
2024 | return cb ? cb(dev) : pm_generic_suspend(dev); |
2025 | } |
2026 | |
2027 | /** |
2028 | * pm_genpd_default_suspend_late - Default "late device suspend" for PM domians. |
2029 | * @dev: Device to handle. |
2030 | */ |
2031 | static int pm_genpd_default_suspend_late(struct device *dev) |
2032 | { |
2033 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.suspend_late; |
2034 | |
2035 | return cb ? cb(dev) : pm_generic_suspend_late(dev); |
2036 | } |
2037 | |
2038 | /** |
2039 | * pm_genpd_default_resume_early - Default "early device resume" for PM domians. |
2040 | * @dev: Device to handle. |
2041 | */ |
2042 | static int pm_genpd_default_resume_early(struct device *dev) |
2043 | { |
2044 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume_early; |
2045 | |
2046 | return cb ? cb(dev) : pm_generic_resume_early(dev); |
2047 | } |
2048 | |
2049 | /** |
2050 | * pm_genpd_default_resume - Default "device resume" for PM domians. |
2051 | * @dev: Device to handle. |
2052 | */ |
2053 | static int pm_genpd_default_resume(struct device *dev) |
2054 | { |
2055 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.resume; |
2056 | |
2057 | return cb ? cb(dev) : pm_generic_resume(dev); |
2058 | } |
2059 | |
2060 | /** |
2061 | * pm_genpd_default_freeze - Default "device freeze" for PM domians. |
2062 | * @dev: Device to handle. |
2063 | */ |
2064 | static int pm_genpd_default_freeze(struct device *dev) |
2065 | { |
2066 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze; |
2067 | |
2068 | return cb ? cb(dev) : pm_generic_freeze(dev); |
2069 | } |
2070 | |
2071 | /** |
2072 | * pm_genpd_default_freeze_late - Default "late device freeze" for PM domians. |
2073 | * @dev: Device to handle. |
2074 | */ |
2075 | static int pm_genpd_default_freeze_late(struct device *dev) |
2076 | { |
2077 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.freeze_late; |
2078 | |
2079 | return cb ? cb(dev) : pm_generic_freeze_late(dev); |
2080 | } |
2081 | |
2082 | /** |
2083 | * pm_genpd_default_thaw_early - Default "early device thaw" for PM domians. |
2084 | * @dev: Device to handle. |
2085 | */ |
2086 | static int pm_genpd_default_thaw_early(struct device *dev) |
2087 | { |
2088 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw_early; |
2089 | |
2090 | return cb ? cb(dev) : pm_generic_thaw_early(dev); |
2091 | } |
2092 | |
2093 | /** |
2094 | * pm_genpd_default_thaw - Default "device thaw" for PM domians. |
2095 | * @dev: Device to handle. |
2096 | */ |
2097 | static int pm_genpd_default_thaw(struct device *dev) |
2098 | { |
2099 | int (*cb)(struct device *__dev) = dev_gpd_data(dev)->ops.thaw; |
2100 | |
2101 | return cb ? cb(dev) : pm_generic_thaw(dev); |
2102 | } |
2103 | |
2104 | #else /* !CONFIG_PM_SLEEP */ |
2105 | |
2106 | #define pm_genpd_default_suspend NULL |
2107 | #define pm_genpd_default_suspend_late NULL |
2108 | #define pm_genpd_default_resume_early NULL |
2109 | #define pm_genpd_default_resume NULL |
2110 | #define pm_genpd_default_freeze NULL |
2111 | #define pm_genpd_default_freeze_late NULL |
2112 | #define pm_genpd_default_thaw_early NULL |
2113 | #define pm_genpd_default_thaw NULL |
2114 | |
2115 | #endif /* !CONFIG_PM_SLEEP */ |
2116 | |
2117 | /** |
2118 | * pm_genpd_init - Initialize a generic I/O PM domain object. |
2119 | * @genpd: PM domain object to initialize. |
2120 | * @gov: PM domain governor to associate with the domain (may be NULL). |
2121 | * @is_off: Initial value of the domain's power_is_off field. |
2122 | */ |
2123 | void pm_genpd_init(struct generic_pm_domain *genpd, |
2124 | struct dev_power_governor *gov, bool is_off) |
2125 | { |
2126 | if (IS_ERR_OR_NULL(genpd)) |
2127 | return; |
2128 | |
2129 | INIT_LIST_HEAD(&genpd->master_links); |
2130 | INIT_LIST_HEAD(&genpd->slave_links); |
2131 | INIT_LIST_HEAD(&genpd->dev_list); |
2132 | mutex_init(&genpd->lock); |
2133 | genpd->gov = gov; |
2134 | INIT_WORK(&genpd->power_off_work, genpd_power_off_work_fn); |
2135 | genpd->in_progress = 0; |
2136 | atomic_set(&genpd->sd_count, 0); |
2137 | genpd->status = is_off ? GPD_STATE_POWER_OFF : GPD_STATE_ACTIVE; |
2138 | init_waitqueue_head(&genpd->status_wait_queue); |
2139 | genpd->poweroff_task = NULL; |
2140 | genpd->resume_count = 0; |
2141 | genpd->device_count = 0; |
2142 | genpd->max_off_time_ns = -1; |
2143 | genpd->max_off_time_changed = true; |
2144 | genpd->domain.ops.runtime_suspend = pm_genpd_runtime_suspend; |
2145 | genpd->domain.ops.runtime_resume = pm_genpd_runtime_resume; |
2146 | genpd->domain.ops.runtime_idle = pm_generic_runtime_idle; |
2147 | genpd->domain.ops.prepare = pm_genpd_prepare; |
2148 | genpd->domain.ops.suspend = pm_genpd_suspend; |
2149 | genpd->domain.ops.suspend_late = pm_genpd_suspend_late; |
2150 | genpd->domain.ops.suspend_noirq = pm_genpd_suspend_noirq; |
2151 | genpd->domain.ops.resume_noirq = pm_genpd_resume_noirq; |
2152 | genpd->domain.ops.resume_early = pm_genpd_resume_early; |
2153 | genpd->domain.ops.resume = pm_genpd_resume; |
2154 | genpd->domain.ops.freeze = pm_genpd_freeze; |
2155 | genpd->domain.ops.freeze_late = pm_genpd_freeze_late; |
2156 | genpd->domain.ops.freeze_noirq = pm_genpd_freeze_noirq; |
2157 | genpd->domain.ops.thaw_noirq = pm_genpd_thaw_noirq; |
2158 | genpd->domain.ops.thaw_early = pm_genpd_thaw_early; |
2159 | genpd->domain.ops.thaw = pm_genpd_thaw; |
2160 | genpd->domain.ops.poweroff = pm_genpd_suspend; |
2161 | genpd->domain.ops.poweroff_late = pm_genpd_suspend_late; |
2162 | genpd->domain.ops.poweroff_noirq = pm_genpd_suspend_noirq; |
2163 | genpd->domain.ops.restore_noirq = pm_genpd_restore_noirq; |
2164 | genpd->domain.ops.restore_early = pm_genpd_resume_early; |
2165 | genpd->domain.ops.restore = pm_genpd_resume; |
2166 | genpd->domain.ops.complete = pm_genpd_complete; |
2167 | genpd->dev_ops.save_state = pm_genpd_default_save_state; |
2168 | genpd->dev_ops.restore_state = pm_genpd_default_restore_state; |
2169 | genpd->dev_ops.suspend = pm_genpd_default_suspend; |
2170 | genpd->dev_ops.suspend_late = pm_genpd_default_suspend_late; |
2171 | genpd->dev_ops.resume_early = pm_genpd_default_resume_early; |
2172 | genpd->dev_ops.resume = pm_genpd_default_resume; |
2173 | genpd->dev_ops.freeze = pm_genpd_default_freeze; |
2174 | genpd->dev_ops.freeze_late = pm_genpd_default_freeze_late; |
2175 | genpd->dev_ops.thaw_early = pm_genpd_default_thaw_early; |
2176 | genpd->dev_ops.thaw = pm_genpd_default_thaw; |
2177 | mutex_lock(&gpd_list_lock); |
2178 | list_add(&genpd->gpd_list_node, &gpd_list); |
2179 | mutex_unlock(&gpd_list_lock); |
2180 | } |
2181 |
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