1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * pm_runtime.h - Device run-time power management helper functions.
8 #ifndef _LINUX_PM_RUNTIME_H
9 #define _LINUX_PM_RUNTIME_H
11 #include <linux/device.h>
12 #include <linux/notifier.h>
15 #include <linux/jiffies.h>
17 /* Runtime PM flag argument bits */
18 #define RPM_ASYNC 0x01 /* Request is asynchronous */
19 #define RPM_NOWAIT 0x02 /* Don't wait for concurrent
21 #define RPM_GET_PUT 0x04 /* Increment/decrement the
23 #define RPM_AUTO 0x08 /* Use autosuspend_delay */
26 extern struct workqueue_struct *pm_wq;
28 static inline bool queue_pm_work(struct work_struct *work)
30 return queue_work(pm_wq, work);
33 extern int pm_generic_runtime_suspend(struct device *dev);
34 extern int pm_generic_runtime_resume(struct device *dev);
35 extern int pm_runtime_force_suspend(struct device *dev);
36 extern int pm_runtime_force_resume(struct device *dev);
38 extern int __pm_runtime_idle(struct device *dev, int rpmflags);
39 extern int __pm_runtime_suspend(struct device *dev, int rpmflags);
40 extern int __pm_runtime_resume(struct device *dev, int rpmflags);
41 extern int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count);
42 extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
43 extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
44 extern int pm_runtime_barrier(struct device *dev);
45 extern void pm_runtime_enable(struct device *dev);
46 extern void __pm_runtime_disable(struct device *dev, bool check_resume);
47 extern void pm_runtime_allow(struct device *dev);
48 extern void pm_runtime_forbid(struct device *dev);
49 extern void pm_runtime_no_callbacks(struct device *dev);
50 extern void pm_runtime_irq_safe(struct device *dev);
51 extern void __pm_runtime_use_autosuspend(struct device *dev, bool use);
52 extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay);
53 extern u64 pm_runtime_autosuspend_expiration(struct device *dev);
54 extern void pm_runtime_update_max_time_suspended(struct device *dev,
56 extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable);
57 extern void pm_runtime_get_suppliers(struct device *dev);
58 extern void pm_runtime_put_suppliers(struct device *dev);
59 extern void pm_runtime_new_link(struct device *dev);
60 extern void pm_runtime_drop_link(struct device_link *link);
63 * pm_runtime_get_if_in_use - Conditionally bump up runtime PM usage counter.
64 * @dev: Target device.
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.
69 static inline int pm_runtime_get_if_in_use(struct device *dev)
71 return pm_runtime_get_if_active(dev, false);
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.
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.
83 static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
85 dev->power.ignore_children = enable;
89 * pm_runtime_get_noresume - Bump up runtime PM usage counter of a device.
90 * @dev: Target device.
92 static inline void pm_runtime_get_noresume(struct device *dev)
94 atomic_inc(&dev->power.usage_count);
98 * pm_runtime_put_noidle - Drop runtime PM usage counter of a device.
99 * @dev: Target device.
101 * Decrement the runtime PM usage counter of @dev unless it is 0 already.
103 static inline void pm_runtime_put_noidle(struct device *dev)
105 atomic_add_unless(&dev->power.usage_count, -1, 0);
109 * pm_runtime_suspended - Check whether or not a device is runtime-suspended.
110 * @dev: Target device.
112 * Return %true if runtime PM is enabled for @dev and its runtime PM status is
113 * %RPM_SUSPENDED, or %false otherwise.
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.
120 static inline bool pm_runtime_suspended(struct device *dev)
122 return dev->power.runtime_status == RPM_SUSPENDED
123 && !dev->power.disable_depth;
127 * pm_runtime_active - Check whether or not a device is runtime-active.
128 * @dev: Target device.
130 * Return %true if runtime PM is enabled for @dev and its runtime PM status is
131 * %RPM_ACTIVE, or %false otherwise.
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.
138 static inline bool pm_runtime_active(struct device *dev)
140 return dev->power.runtime_status == RPM_ACTIVE
141 || dev->power.disable_depth;
145 * pm_runtime_status_suspended - Check if runtime PM status is "suspended".
146 * @dev: Target device.
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.
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.
155 static inline bool pm_runtime_status_suspended(struct device *dev)
157 return dev->power.runtime_status == RPM_SUSPENDED;
161 * pm_runtime_enabled - Check if runtime PM is enabled.
162 * @dev: Target device.
164 * Return %true if runtime PM is enabled for @dev or %false otherwise.
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.
170 static inline bool pm_runtime_enabled(struct device *dev)
172 return !dev->power.disable_depth;
176 * pm_runtime_has_no_callbacks - Check if runtime PM callbacks may be present.
177 * @dev: Target device.
179 * Return %true if @dev is a special device without runtime PM callbacks or
182 static inline bool pm_runtime_has_no_callbacks(struct device *dev)
184 return dev->power.no_callbacks;
188 * pm_runtime_mark_last_busy - Update the last access time of a device.
189 * @dev: Target device.
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().
194 static inline void pm_runtime_mark_last_busy(struct device *dev)
196 WRITE_ONCE(dev->power.last_busy, ktime_get_mono_fast_ns());
200 * pm_runtime_is_irq_safe - Check if runtime PM can work in interrupt context.
201 * @dev: Target device.
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.
207 static inline bool pm_runtime_is_irq_safe(struct device *dev)
209 return dev->power.irq_safe;
212 extern u64 pm_runtime_suspended_time(struct device *dev);
214 #else /* !CONFIG_PM */
216 static inline bool queue_pm_work(struct work_struct *work) { return false; }
218 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
219 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
220 static inline int pm_runtime_force_suspend(struct device *dev) { return 0; }
221 static inline int pm_runtime_force_resume(struct device *dev) { return 0; }
223 static inline int __pm_runtime_idle(struct device *dev, int rpmflags)
227 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags)
231 static inline int __pm_runtime_resume(struct device *dev, int rpmflags)
235 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
239 static inline int pm_runtime_get_if_in_use(struct device *dev)
243 static inline int pm_runtime_get_if_active(struct device *dev,
244 bool ign_usage_count)
248 static inline int __pm_runtime_set_status(struct device *dev,
249 unsigned int status) { return 0; }
250 static inline int pm_runtime_barrier(struct device *dev) { return 0; }
251 static inline void pm_runtime_enable(struct device *dev) {}
252 static inline void __pm_runtime_disable(struct device *dev, bool c) {}
253 static inline void pm_runtime_allow(struct device *dev) {}
254 static inline void pm_runtime_forbid(struct device *dev) {}
256 static inline void pm_suspend_ignore_children(struct device *dev, bool enable) {}
257 static inline void pm_runtime_get_noresume(struct device *dev) {}
258 static inline void pm_runtime_put_noidle(struct device *dev) {}
259 static inline bool pm_runtime_suspended(struct device *dev) { return false; }
260 static inline bool pm_runtime_active(struct device *dev) { return true; }
261 static inline bool pm_runtime_status_suspended(struct device *dev) { return false; }
262 static inline bool pm_runtime_enabled(struct device *dev) { return false; }
264 static inline void pm_runtime_no_callbacks(struct device *dev) {}
265 static inline void pm_runtime_irq_safe(struct device *dev) {}
266 static inline bool pm_runtime_is_irq_safe(struct device *dev) { return false; }
268 static inline bool pm_runtime_has_no_callbacks(struct device *dev) { return false; }
269 static inline void pm_runtime_mark_last_busy(struct device *dev) {}
270 static inline void __pm_runtime_use_autosuspend(struct device *dev,
272 static inline void pm_runtime_set_autosuspend_delay(struct device *dev,
274 static inline u64 pm_runtime_autosuspend_expiration(
275 struct device *dev) { return 0; }
276 static inline void pm_runtime_set_memalloc_noio(struct device *dev,
278 static inline void pm_runtime_get_suppliers(struct device *dev) {}
279 static inline void pm_runtime_put_suppliers(struct device *dev) {}
280 static inline void pm_runtime_new_link(struct device *dev) {}
281 static inline void pm_runtime_drop_link(struct device_link *link) {}
283 #endif /* !CONFIG_PM */
286 * pm_runtime_idle - Conditionally set up autosuspend of a device or suspend it.
287 * @dev: Target device.
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).
293 static inline int pm_runtime_idle(struct device *dev)
295 return __pm_runtime_idle(dev, 0);
299 * pm_runtime_suspend - Suspend a device synchronously.
300 * @dev: Target device.
302 static inline int pm_runtime_suspend(struct device *dev)
304 return __pm_runtime_suspend(dev, 0);
308 * pm_runtime_autosuspend - Set up autosuspend of a device or suspend it.
309 * @dev: Target device.
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.
314 static inline int pm_runtime_autosuspend(struct device *dev)
316 return __pm_runtime_suspend(dev, RPM_AUTO);
320 * pm_runtime_resume - Resume a device synchronously.
321 * @dev: Target device.
323 static inline int pm_runtime_resume(struct device *dev)
325 return __pm_runtime_resume(dev, 0);
329 * pm_request_idle - Queue up "idle check" execution for a device.
330 * @dev: Target device.
332 * Queue up a work item to run an equivalent of pm_runtime_idle() for @dev
335 static inline int pm_request_idle(struct device *dev)
337 return __pm_runtime_idle(dev, RPM_ASYNC);
341 * pm_request_resume - Queue up runtime-resume of a device.
342 * @dev: Target device.
344 static inline int pm_request_resume(struct device *dev)
346 return __pm_runtime_resume(dev, RPM_ASYNC);
350 * pm_request_autosuspend - Queue up autosuspend of a device.
351 * @dev: Target device.
353 * Queue up a work item to run an equivalent pm_runtime_autosuspend() for @dev
356 static inline int pm_request_autosuspend(struct device *dev)
358 return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO);
362 * pm_runtime_get - Bump up usage counter and queue up resume of a device.
363 * @dev: Target device.
365 * Bump up the runtime PM usage counter of @dev and queue up a work item to
366 * carry out runtime-resume of it.
368 static inline int pm_runtime_get(struct device *dev)
370 return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC);
374 * pm_runtime_get_sync - Bump up usage counter of a device and resume it.
375 * @dev: Target device.
377 * Bump up the runtime PM usage counter of @dev and carry out runtime-resume of
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 * Consider using pm_runtime_resume_and_get() instead of it, especially
384 * if its return value is checked by the caller, as this is likely to result
387 static inline int pm_runtime_get_sync(struct device *dev)
389 return __pm_runtime_resume(dev, RPM_GET_PUT);
393 * pm_runtime_resume_and_get - Bump up usage counter of a device and resume it.
394 * @dev: Target device.
396 * Resume @dev synchronously and if that is successful, increment its runtime
397 * PM usage counter. Return 0 if the runtime PM usage counter of @dev has been
398 * incremented or a negative error code otherwise.
400 static inline int pm_runtime_resume_and_get(struct device *dev)
404 ret = __pm_runtime_resume(dev, RPM_GET_PUT);
406 pm_runtime_put_noidle(dev);
414 * pm_runtime_put - Drop device usage counter and queue up "idle check" if 0.
415 * @dev: Target device.
417 * Decrement the runtime PM usage counter of @dev and if it turns out to be
418 * equal to 0, queue up a work item for @dev like in pm_request_idle().
420 static inline int pm_runtime_put(struct device *dev)
422 return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC);
426 * pm_runtime_put_autosuspend - Drop device usage counter and queue autosuspend if 0.
427 * @dev: Target device.
429 * Decrement the runtime PM usage counter of @dev and if it turns out to be
430 * equal to 0, queue up a work item for @dev like in pm_request_autosuspend().
432 static inline int pm_runtime_put_autosuspend(struct device *dev)
434 return __pm_runtime_suspend(dev,
435 RPM_GET_PUT | RPM_ASYNC | RPM_AUTO);
439 * pm_runtime_put_sync - Drop device usage counter and run "idle check" if 0.
440 * @dev: Target device.
442 * Decrement the runtime PM usage counter of @dev and if it turns out to be
443 * equal to 0, invoke the "idle check" callback of @dev and, depending on its
444 * return value, set up autosuspend of @dev or suspend it (depending on whether
445 * or not autosuspend has been enabled for it).
447 * The possible return values of this function are the same as for
448 * pm_runtime_idle() and the runtime PM usage counter of @dev remains
449 * decremented in all cases, even if it returns an error code.
451 static inline int pm_runtime_put_sync(struct device *dev)
453 return __pm_runtime_idle(dev, RPM_GET_PUT);
457 * pm_runtime_put_sync_suspend - Drop device usage counter and suspend if 0.
458 * @dev: Target device.
460 * Decrement the runtime PM usage counter of @dev and if it turns out to be
461 * equal to 0, carry out runtime-suspend of @dev synchronously.
463 * The possible return values of this function are the same as for
464 * pm_runtime_suspend() and the runtime PM usage counter of @dev remains
465 * decremented in all cases, even if it returns an error code.
467 static inline int pm_runtime_put_sync_suspend(struct device *dev)
469 return __pm_runtime_suspend(dev, RPM_GET_PUT);
473 * pm_runtime_put_sync_autosuspend - Drop device usage counter and autosuspend if 0.
474 * @dev: Target device.
476 * Decrement the runtime PM usage counter of @dev and if it turns out to be
477 * equal to 0, set up autosuspend of @dev or suspend it synchronously (depending
478 * on whether or not autosuspend has been enabled for it).
480 * The possible return values of this function are the same as for
481 * pm_runtime_autosuspend() and the runtime PM usage counter of @dev remains
482 * decremented in all cases, even if it returns an error code.
484 static inline int pm_runtime_put_sync_autosuspend(struct device *dev)
486 return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO);
490 * pm_runtime_set_active - Set runtime PM status to "active".
491 * @dev: Target device.
493 * Set the runtime PM status of @dev to %RPM_ACTIVE and ensure that dependencies
494 * of it will be taken into account.
496 * It is not valid to call this function for devices with runtime PM enabled.
498 static inline int pm_runtime_set_active(struct device *dev)
500 return __pm_runtime_set_status(dev, RPM_ACTIVE);
504 * pm_runtime_set_suspended - Set runtime PM status to "suspended".
505 * @dev: Target device.
507 * Set the runtime PM status of @dev to %RPM_SUSPENDED and ensure that
508 * dependencies of it will be taken into account.
510 * It is not valid to call this function for devices with runtime PM enabled.
512 static inline int pm_runtime_set_suspended(struct device *dev)
514 return __pm_runtime_set_status(dev, RPM_SUSPENDED);
518 * pm_runtime_disable - Disable runtime PM for a device.
519 * @dev: Target device.
521 * Prevent the runtime PM framework from working with @dev (by incrementing its
522 * "blocking" counter).
524 * For each invocation of this function for @dev there must be a matching
525 * pm_runtime_enable() call in order for runtime PM to be enabled for it.
527 static inline void pm_runtime_disable(struct device *dev)
529 __pm_runtime_disable(dev, true);
533 * pm_runtime_use_autosuspend - Allow autosuspend to be used for a device.
534 * @dev: Target device.
536 * Allow the runtime PM autosuspend mechanism to be used for @dev whenever
537 * requested (or "autosuspend" will be handled as direct runtime-suspend for
540 static inline void pm_runtime_use_autosuspend(struct device *dev)
542 __pm_runtime_use_autosuspend(dev, true);
546 * pm_runtime_dont_use_autosuspend - Prevent autosuspend from being used.
547 * @dev: Target device.
549 * Prevent the runtime PM autosuspend mechanism from being used for @dev which
550 * means that "autosuspend" will be handled as direct runtime-suspend for it
553 static inline void pm_runtime_dont_use_autosuspend(struct device *dev)
555 __pm_runtime_use_autosuspend(dev, false);