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