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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * pm_runtime.h - Device run-time power management helper functions.
4 *
5 * Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>
6 */
7
8#ifndef _LINUX_PM_RUNTIME_H
9#define _LINUX_PM_RUNTIME_H
10
11#include <linux/device.h>
12#include <linux/notifier.h>
13#include <linux/pm.h>
14
15#include <linux/jiffies.h>
16
17/* Runtime PM flag argument bits */
18#define RPM_ASYNC 0x01 /* Request is asynchronous */
19#define RPM_NOWAIT 0x02 /* Don't wait for concurrent
20 state change */
21#define RPM_GET_PUT 0x04 /* Increment/decrement the
22 usage_count */
23#define RPM_AUTO 0x08 /* Use autosuspend_delay */
24
25/*
26 * Use this for defining a set of PM operations to be used in all situations
27 * (system suspend, hibernation or runtime PM).
28 *
29 * Note that the behaviour differs from the deprecated UNIVERSAL_DEV_PM_OPS()
30 * macro, which uses the provided callbacks for both runtime PM and system
31 * sleep, while DEFINE_RUNTIME_DEV_PM_OPS() uses pm_runtime_force_suspend()
32 * and pm_runtime_force_resume() for its system sleep callbacks.
33 *
34 * If the underlying dev_pm_ops struct symbol has to be exported, use
35 * EXPORT_RUNTIME_DEV_PM_OPS() or EXPORT_GPL_RUNTIME_DEV_PM_OPS() instead.
36 */
37#define DEFINE_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
38 _DEFINE_DEV_PM_OPS(name, pm_runtime_force_suspend, \
39 pm_runtime_force_resume, suspend_fn, \
40 resume_fn, idle_fn)
41
42#define EXPORT_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
43 _EXPORT_DEV_PM_OPS(name, pm_runtime_force_suspend, pm_runtime_force_resume, \
44 suspend_fn, resume_fn, idle_fn, "")
45#define EXPORT_GPL_RUNTIME_DEV_PM_OPS(name, suspend_fn, resume_fn, idle_fn) \
46 _EXPORT_DEV_PM_OPS(name, pm_runtime_force_suspend, pm_runtime_force_resume, \
47 suspend_fn, resume_fn, idle_fn, "_gpl")
48
49#ifdef CONFIG_PM
50extern struct workqueue_struct *pm_wq;
51
52static inline bool queue_pm_work(struct work_struct *work)
53{
54 return queue_work(pm_wq, work);
55}
56
57extern int pm_generic_runtime_suspend(struct device *dev);
58extern int pm_generic_runtime_resume(struct device *dev);
59extern int pm_runtime_force_suspend(struct device *dev);
60extern int pm_runtime_force_resume(struct device *dev);
61
62extern int __pm_runtime_idle(struct device *dev, int rpmflags);
63extern int __pm_runtime_suspend(struct device *dev, int rpmflags);
64extern int __pm_runtime_resume(struct device *dev, int rpmflags);
65extern int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count);
66extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
67extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
68extern int pm_runtime_barrier(struct device *dev);
69extern void pm_runtime_enable(struct device *dev);
70extern void __pm_runtime_disable(struct device *dev, bool check_resume);
71extern void pm_runtime_allow(struct device *dev);
72extern void pm_runtime_forbid(struct device *dev);
73extern void pm_runtime_no_callbacks(struct device *dev);
74extern void pm_runtime_irq_safe(struct device *dev);
75extern void __pm_runtime_use_autosuspend(struct device *dev, bool use);
76extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay);
77extern u64 pm_runtime_autosuspend_expiration(struct device *dev);
78extern void pm_runtime_update_max_time_suspended(struct device *dev,
79 s64 delta_ns);
80extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable);
81extern void pm_runtime_get_suppliers(struct device *dev);
82extern void pm_runtime_put_suppliers(struct device *dev);
83extern void pm_runtime_new_link(struct device *dev);
84extern void pm_runtime_drop_link(struct device_link *link);
85extern void pm_runtime_release_supplier(struct device_link *link, bool check_idle);
86
87extern int devm_pm_runtime_enable(struct device *dev);
88
89/**
90 * pm_runtime_get_if_in_use - Conditionally bump up runtime PM usage counter.
91 * @dev: Target device.
92 *
93 * Increment the runtime PM usage counter of @dev if its runtime PM status is
94 * %RPM_ACTIVE and its runtime PM usage counter is greater than 0.
95 */
96static inline int pm_runtime_get_if_in_use(struct device *dev)
97{
98 return pm_runtime_get_if_active(dev, false);
99}
100
101/**
102 * pm_suspend_ignore_children - Set runtime PM behavior regarding children.
103 * @dev: Target device.
104 * @enable: Whether or not to ignore possible dependencies on children.
105 *
106 * The dependencies of @dev on its children will not be taken into account by
107 * the runtime PM framework going forward if @enable is %true, or they will
108 * be taken into account otherwise.
109 */
110static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
111{
112 dev->power.ignore_children = enable;
113}
114
115/**
116 * pm_runtime_get_noresume - Bump up runtime PM usage counter of a device.
117 * @dev: Target device.
118 */
119static inline void pm_runtime_get_noresume(struct device *dev)
120{
121 atomic_inc(&dev->power.usage_count);
122}
123
124/**
125 * pm_runtime_put_noidle - Drop runtime PM usage counter of a device.
126 * @dev: Target device.
127 *
128 * Decrement the runtime PM usage counter of @dev unless it is 0 already.
129 */
130static inline void pm_runtime_put_noidle(struct device *dev)
131{
132 atomic_add_unless(&dev->power.usage_count, -1, 0);
133}
134
135/**
136 * pm_runtime_suspended - Check whether or not a device is runtime-suspended.
137 * @dev: Target device.
138 *
139 * Return %true if runtime PM is enabled for @dev and its runtime PM status is
140 * %RPM_SUSPENDED, or %false otherwise.
141 *
142 * Note that the return value of this function can only be trusted if it is
143 * called under the runtime PM lock of @dev or under conditions in which
144 * runtime PM cannot be either disabled or enabled for @dev and its runtime PM
145 * status cannot change.
146 */
147static inline bool pm_runtime_suspended(struct device *dev)
148{
149 return dev->power.runtime_status == RPM_SUSPENDED
150 && !dev->power.disable_depth;
151}
152
153/**
154 * pm_runtime_active - Check whether or not a device is runtime-active.
155 * @dev: Target device.
156 *
157 * Return %true if runtime PM is disabled for @dev or its runtime PM status is
158 * %RPM_ACTIVE, or %false otherwise.
159 *
160 * Note that the return value of this function can only be trusted if it is
161 * called under the runtime PM lock of @dev or under conditions in which
162 * runtime PM cannot be either disabled or enabled for @dev and its runtime PM
163 * status cannot change.
164 */
165static inline bool pm_runtime_active(struct device *dev)
166{
167 return dev->power.runtime_status == RPM_ACTIVE
168 || dev->power.disable_depth;
169}
170
171/**
172 * pm_runtime_status_suspended - Check if runtime PM status is "suspended".
173 * @dev: Target device.
174 *
175 * Return %true if the runtime PM status of @dev is %RPM_SUSPENDED, or %false
176 * otherwise, regardless of whether or not runtime PM has been enabled for @dev.
177 *
178 * Note that the return value of this function can only be trusted if it is
179 * called under the runtime PM lock of @dev or under conditions in which the
180 * runtime PM status of @dev cannot change.
181 */
182static inline bool pm_runtime_status_suspended(struct device *dev)
183{
184 return dev->power.runtime_status == RPM_SUSPENDED;
185}
186
187/**
188 * pm_runtime_enabled - Check if runtime PM is enabled.
189 * @dev: Target device.
190 *
191 * Return %true if runtime PM is enabled for @dev or %false otherwise.
192 *
193 * Note that the return value of this function can only be trusted if it is
194 * called under the runtime PM lock of @dev or under conditions in which
195 * runtime PM cannot be either disabled or enabled for @dev.
196 */
197static inline bool pm_runtime_enabled(struct device *dev)
198{
199 return !dev->power.disable_depth;
200}
201
202/**
203 * pm_runtime_has_no_callbacks - Check if runtime PM callbacks may be present.
204 * @dev: Target device.
205 *
206 * Return %true if @dev is a special device without runtime PM callbacks or
207 * %false otherwise.
208 */
209static inline bool pm_runtime_has_no_callbacks(struct device *dev)
210{
211 return dev->power.no_callbacks;
212}
213
214/**
215 * pm_runtime_mark_last_busy - Update the last access time of a device.
216 * @dev: Target device.
217 *
218 * Update the last access time of @dev used by the runtime PM autosuspend
219 * mechanism to the current time as returned by ktime_get_mono_fast_ns().
220 */
221static inline void pm_runtime_mark_last_busy(struct device *dev)
222{
223 WRITE_ONCE(dev->power.last_busy, ktime_get_mono_fast_ns());
224}
225
226/**
227 * pm_runtime_is_irq_safe - Check if runtime PM can work in interrupt context.
228 * @dev: Target device.
229 *
230 * Return %true if @dev has been marked as an "IRQ-safe" device (with respect
231 * to runtime PM), in which case its runtime PM callabcks can be expected to
232 * work correctly when invoked from interrupt handlers.
233 */
234static inline bool pm_runtime_is_irq_safe(struct device *dev)
235{
236 return dev->power.irq_safe;
237}
238
239extern u64 pm_runtime_suspended_time(struct device *dev);
240
241#else /* !CONFIG_PM */
242
243static inline bool queue_pm_work(struct work_struct *work) { return false; }
244
245static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
246static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
247static inline int pm_runtime_force_suspend(struct device *dev) { return 0; }
248static inline int pm_runtime_force_resume(struct device *dev) { return 0; }
249
250static inline int __pm_runtime_idle(struct device *dev, int rpmflags)
251{
252 return -ENOSYS;
253}
254static inline int __pm_runtime_suspend(struct device *dev, int rpmflags)
255{
256 return -ENOSYS;
257}
258static inline int __pm_runtime_resume(struct device *dev, int rpmflags)
259{
260 return 1;
261}
262static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
263{
264 return -ENOSYS;
265}
266static inline int pm_runtime_get_if_in_use(struct device *dev)
267{
268 return -EINVAL;
269}
270static inline int pm_runtime_get_if_active(struct device *dev,
271 bool ign_usage_count)
272{
273 return -EINVAL;
274}
275static inline int __pm_runtime_set_status(struct device *dev,
276 unsigned int status) { return 0; }
277static inline int pm_runtime_barrier(struct device *dev) { return 0; }
278static inline void pm_runtime_enable(struct device *dev) {}
279static inline void __pm_runtime_disable(struct device *dev, bool c) {}
280static inline void pm_runtime_allow(struct device *dev) {}
281static inline void pm_runtime_forbid(struct device *dev) {}
282
283static inline int devm_pm_runtime_enable(struct device *dev) { return 0; }
284
285static inline void pm_suspend_ignore_children(struct device *dev, bool enable) {}
286static inline void pm_runtime_get_noresume(struct device *dev) {}
287static inline void pm_runtime_put_noidle(struct device *dev) {}
288static inline bool pm_runtime_suspended(struct device *dev) { return false; }
289static inline bool pm_runtime_active(struct device *dev) { return true; }
290static inline bool pm_runtime_status_suspended(struct device *dev) { return false; }
291static inline bool pm_runtime_enabled(struct device *dev) { return false; }
292
293static inline void pm_runtime_no_callbacks(struct device *dev) {}
294static inline void pm_runtime_irq_safe(struct device *dev) {}
295static inline bool pm_runtime_is_irq_safe(struct device *dev) { return false; }
296
297static inline bool pm_runtime_has_no_callbacks(struct device *dev) { return false; }
298static inline void pm_runtime_mark_last_busy(struct device *dev) {}
299static inline void __pm_runtime_use_autosuspend(struct device *dev,
300 bool use) {}
301static inline void pm_runtime_set_autosuspend_delay(struct device *dev,
302 int delay) {}
303static inline u64 pm_runtime_autosuspend_expiration(
304 struct device *dev) { return 0; }
305static inline void pm_runtime_set_memalloc_noio(struct device *dev,
306 bool enable){}
307static inline void pm_runtime_get_suppliers(struct device *dev) {}
308static inline void pm_runtime_put_suppliers(struct device *dev) {}
309static inline void pm_runtime_new_link(struct device *dev) {}
310static inline void pm_runtime_drop_link(struct device_link *link) {}
311static inline void pm_runtime_release_supplier(struct device_link *link,
312 bool check_idle) {}
313
314#endif /* !CONFIG_PM */
315
316/**
317 * pm_runtime_idle - Conditionally set up autosuspend of a device or suspend it.
318 * @dev: Target device.
319 *
320 * Invoke the "idle check" callback of @dev and, depending on its return value,
321 * set up autosuspend of @dev or suspend it (depending on whether or not
322 * autosuspend has been enabled for it).
323 */
324static inline int pm_runtime_idle(struct device *dev)
325{
326 return __pm_runtime_idle(dev, 0);
327}
328
329/**
330 * pm_runtime_suspend - Suspend a device synchronously.
331 * @dev: Target device.
332 */
333static inline int pm_runtime_suspend(struct device *dev)
334{
335 return __pm_runtime_suspend(dev, 0);
336}
337
338/**
339 * pm_runtime_autosuspend - Set up autosuspend of a device or suspend it.
340 * @dev: Target device.
341 *
342 * Set up autosuspend of @dev or suspend it (depending on whether or not
343 * autosuspend is enabled for it) without engaging its "idle check" callback.
344 */
345static inline int pm_runtime_autosuspend(struct device *dev)
346{
347 return __pm_runtime_suspend(dev, RPM_AUTO);
348}
349
350/**
351 * pm_runtime_resume - Resume a device synchronously.
352 * @dev: Target device.
353 */
354static inline int pm_runtime_resume(struct device *dev)
355{
356 return __pm_runtime_resume(dev, 0);
357}
358
359/**
360 * pm_request_idle - Queue up "idle check" execution for a device.
361 * @dev: Target device.
362 *
363 * Queue up a work item to run an equivalent of pm_runtime_idle() for @dev
364 * asynchronously.
365 */
366static inline int pm_request_idle(struct device *dev)
367{
368 return __pm_runtime_idle(dev, RPM_ASYNC);
369}
370
371/**
372 * pm_request_resume - Queue up runtime-resume of a device.
373 * @dev: Target device.
374 */
375static inline int pm_request_resume(struct device *dev)
376{
377 return __pm_runtime_resume(dev, RPM_ASYNC);
378}
379
380/**
381 * pm_request_autosuspend - Queue up autosuspend of a device.
382 * @dev: Target device.
383 *
384 * Queue up a work item to run an equivalent pm_runtime_autosuspend() for @dev
385 * asynchronously.
386 */
387static inline int pm_request_autosuspend(struct device *dev)
388{
389 return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO);
390}
391
392/**
393 * pm_runtime_get - Bump up usage counter and queue up resume of a device.
394 * @dev: Target device.
395 *
396 * Bump up the runtime PM usage counter of @dev and queue up a work item to
397 * carry out runtime-resume of it.
398 */
399static inline int pm_runtime_get(struct device *dev)
400{
401 return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC);
402}
403
404/**
405 * pm_runtime_get_sync - Bump up usage counter of a device and resume it.
406 * @dev: Target device.
407 *
408 * Bump up the runtime PM usage counter of @dev and carry out runtime-resume of
409 * it synchronously.
410 *
411 * The possible return values of this function are the same as for
412 * pm_runtime_resume() and the runtime PM usage counter of @dev remains
413 * incremented in all cases, even if it returns an error code.
414 * Consider using pm_runtime_resume_and_get() instead of it, especially
415 * if its return value is checked by the caller, as this is likely to result
416 * in cleaner code.
417 */
418static inline int pm_runtime_get_sync(struct device *dev)
419{
420 return __pm_runtime_resume(dev, RPM_GET_PUT);
421}
422
423/**
424 * pm_runtime_resume_and_get - Bump up usage counter of a device and resume it.
425 * @dev: Target device.
426 *
427 * Resume @dev synchronously and if that is successful, increment its runtime
428 * PM usage counter. Return 0 if the runtime PM usage counter of @dev has been
429 * incremented or a negative error code otherwise.
430 */
431static inline int pm_runtime_resume_and_get(struct device *dev)
432{
433 int ret;
434
435 ret = __pm_runtime_resume(dev, RPM_GET_PUT);
436 if (ret < 0) {
437 pm_runtime_put_noidle(dev);
438 return ret;
439 }
440
441 return 0;
442}
443
444/**
445 * pm_runtime_put - Drop device usage counter and queue up "idle check" if 0.
446 * @dev: Target device.
447 *
448 * Decrement the runtime PM usage counter of @dev and if it turns out to be
449 * equal to 0, queue up a work item for @dev like in pm_request_idle().
450 */
451static inline int pm_runtime_put(struct device *dev)
452{
453 return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC);
454}
455
456/**
457 * pm_runtime_put_autosuspend - Drop device usage counter and queue autosuspend if 0.
458 * @dev: Target device.
459 *
460 * Decrement the runtime PM usage counter of @dev and if it turns out to be
461 * equal to 0, queue up a work item for @dev like in pm_request_autosuspend().
462 */
463static inline int pm_runtime_put_autosuspend(struct device *dev)
464{
465 return __pm_runtime_suspend(dev,
466 RPM_GET_PUT | RPM_ASYNC | RPM_AUTO);
467}
468
469/**
470 * pm_runtime_put_sync - Drop device usage counter and run "idle check" if 0.
471 * @dev: Target device.
472 *
473 * Decrement the runtime PM usage counter of @dev and if it turns out to be
474 * equal to 0, invoke the "idle check" callback of @dev and, depending on its
475 * return value, set up autosuspend of @dev or suspend it (depending on whether
476 * or not autosuspend has been enabled for it).
477 *
478 * The possible return values of this function are the same as for
479 * pm_runtime_idle() and the runtime PM usage counter of @dev remains
480 * decremented in all cases, even if it returns an error code.
481 */
482static inline int pm_runtime_put_sync(struct device *dev)
483{
484 return __pm_runtime_idle(dev, RPM_GET_PUT);
485}
486
487/**
488 * pm_runtime_put_sync_suspend - Drop device usage counter and suspend if 0.
489 * @dev: Target device.
490 *
491 * Decrement the runtime PM usage counter of @dev and if it turns out to be
492 * equal to 0, carry out runtime-suspend of @dev synchronously.
493 *
494 * The possible return values of this function are the same as for
495 * pm_runtime_suspend() and the runtime PM usage counter of @dev remains
496 * decremented in all cases, even if it returns an error code.
497 */
498static inline int pm_runtime_put_sync_suspend(struct device *dev)
499{
500 return __pm_runtime_suspend(dev, RPM_GET_PUT);
501}
502
503/**
504 * pm_runtime_put_sync_autosuspend - Drop device usage counter and autosuspend if 0.
505 * @dev: Target device.
506 *
507 * Decrement the runtime PM usage counter of @dev and if it turns out to be
508 * equal to 0, set up autosuspend of @dev or suspend it synchronously (depending
509 * on whether or not autosuspend has been enabled for it).
510 *
511 * The possible return values of this function are the same as for
512 * pm_runtime_autosuspend() and the runtime PM usage counter of @dev remains
513 * decremented in all cases, even if it returns an error code.
514 */
515static inline int pm_runtime_put_sync_autosuspend(struct device *dev)
516{
517 return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO);
518}
519
520/**
521 * pm_runtime_set_active - Set runtime PM status to "active".
522 * @dev: Target device.
523 *
524 * Set the runtime PM status of @dev to %RPM_ACTIVE and ensure that dependencies
525 * of it will be taken into account.
526 *
527 * It is not valid to call this function for devices with runtime PM enabled.
528 */
529static inline int pm_runtime_set_active(struct device *dev)
530{
531 return __pm_runtime_set_status(dev, RPM_ACTIVE);
532}
533
534/**
535 * pm_runtime_set_suspended - Set runtime PM status to "suspended".
536 * @dev: Target device.
537 *
538 * Set the runtime PM status of @dev to %RPM_SUSPENDED and ensure that
539 * dependencies of it will be taken into account.
540 *
541 * It is not valid to call this function for devices with runtime PM enabled.
542 */
543static inline int pm_runtime_set_suspended(struct device *dev)
544{
545 return __pm_runtime_set_status(dev, RPM_SUSPENDED);
546}
547
548/**
549 * pm_runtime_disable - Disable runtime PM for a device.
550 * @dev: Target device.
551 *
552 * Prevent the runtime PM framework from working with @dev (by incrementing its
553 * "blocking" counter).
554 *
555 * For each invocation of this function for @dev there must be a matching
556 * pm_runtime_enable() call in order for runtime PM to be enabled for it.
557 */
558static inline void pm_runtime_disable(struct device *dev)
559{
560 __pm_runtime_disable(dev, true);
561}
562
563/**
564 * pm_runtime_use_autosuspend - Allow autosuspend to be used for a device.
565 * @dev: Target device.
566 *
567 * Allow the runtime PM autosuspend mechanism to be used for @dev whenever
568 * requested (or "autosuspend" will be handled as direct runtime-suspend for
569 * it).
570 */
571static inline void pm_runtime_use_autosuspend(struct device *dev)
572{
573 __pm_runtime_use_autosuspend(dev, true);
574}
575
576/**
577 * pm_runtime_dont_use_autosuspend - Prevent autosuspend from being used.
578 * @dev: Target device.
579 *
580 * Prevent the runtime PM autosuspend mechanism from being used for @dev which
581 * means that "autosuspend" will be handled as direct runtime-suspend for it
582 * going forward.
583 */
584static inline void pm_runtime_dont_use_autosuspend(struct device *dev)
585{
586 __pm_runtime_use_autosuspend(dev, false);
587}
588
589#endif