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_clean_up_links(struct device *dev);
58 extern void pm_runtime_get_suppliers(struct device *dev);
59 extern void pm_runtime_put_suppliers(struct device *dev);
60 extern void pm_runtime_new_link(struct device *dev);
61 extern void pm_runtime_drop_link(struct device *dev);
64 * pm_runtime_get_if_in_use - Conditionally bump up runtime PM usage counter.
65 * @dev: Target device.
67 * Increment the runtime PM usage counter of @dev if its runtime PM status is
68 * %RPM_ACTIVE and its runtime PM usage counter is greater than 0.
70 static inline int pm_runtime_get_if_in_use(struct device *dev)
72 return pm_runtime_get_if_active(dev, false);
76 * pm_suspend_ignore_children - Set runtime PM behavior regarding children.
77 * @dev: Target device.
78 * @enable: Whether or not to ignore possible dependencies on children.
80 * The dependencies of @dev on its children will not be taken into account by
81 * the runtime PM framework going forward if @enable is %true, or they will
82 * be taken into account otherwise.
84 static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
86 dev->power.ignore_children = enable;
90 * pm_runtime_get_noresume - Bump up runtime PM usage counter of a device.
91 * @dev: Target device.
93 static inline void pm_runtime_get_noresume(struct device *dev)
95 atomic_inc(&dev->power.usage_count);
99 * pm_runtime_put_noidle - Drop runtime PM usage counter of a device.
100 * @dev: Target device.
102 * Decrement the runtime PM usage counter of @dev unless it is 0 already.
104 static inline void pm_runtime_put_noidle(struct device *dev)
106 atomic_add_unless(&dev->power.usage_count, -1, 0);
110 * pm_runtime_suspended - Check whether or not a device is runtime-suspended.
111 * @dev: Target device.
113 * Return %true if runtime PM is enabled for @dev and its runtime PM status is
114 * %RPM_SUSPENDED, or %false otherwise.
116 * Note that the return value of this function can only be trusted if it is
117 * called under the runtime PM lock of @dev or under conditions in which
118 * runtime PM cannot be either disabled or enabled for @dev and its runtime PM
119 * status cannot change.
121 static inline bool pm_runtime_suspended(struct device *dev)
123 return dev->power.runtime_status == RPM_SUSPENDED
124 && !dev->power.disable_depth;
128 * pm_runtime_active - Check whether or not a device is runtime-active.
129 * @dev: Target device.
131 * Return %true if runtime PM is enabled for @dev and its runtime PM status is
132 * %RPM_ACTIVE, or %false otherwise.
134 * Note that the return value of this function can only be trusted if it is
135 * called under the runtime PM lock of @dev or under conditions in which
136 * runtime PM cannot be either disabled or enabled for @dev and its runtime PM
137 * status cannot change.
139 static inline bool pm_runtime_active(struct device *dev)
141 return dev->power.runtime_status == RPM_ACTIVE
142 || dev->power.disable_depth;
146 * pm_runtime_status_suspended - Check if runtime PM status is "suspended".
147 * @dev: Target device.
149 * Return %true if the runtime PM status of @dev is %RPM_SUSPENDED, or %false
150 * otherwise, regardless of whether or not runtime PM has been enabled for @dev.
152 * Note that the return value of this function can only be trusted if it is
153 * called under the runtime PM lock of @dev or under conditions in which the
154 * runtime PM status of @dev cannot change.
156 static inline bool pm_runtime_status_suspended(struct device *dev)
158 return dev->power.runtime_status == RPM_SUSPENDED;
162 * pm_runtime_enabled - Check if runtime PM is enabled.
163 * @dev: Target device.
165 * Return %true if runtime PM is enabled for @dev or %false otherwise.
167 * Note that the return value of this function can only be trusted if it is
168 * called under the runtime PM lock of @dev or under conditions in which
169 * runtime PM cannot be either disabled or enabled for @dev.
171 static inline bool pm_runtime_enabled(struct device *dev)
173 return !dev->power.disable_depth;
177 * pm_runtime_has_no_callbacks - Check if runtime PM callbacks may be present.
178 * @dev: Target device.
180 * Return %true if @dev is a special device without runtime PM callbacks or
183 static inline bool pm_runtime_has_no_callbacks(struct device *dev)
185 return dev->power.no_callbacks;
189 * pm_runtime_mark_last_busy - Update the last access time of a device.
190 * @dev: Target device.
192 * Update the last access time of @dev used by the runtime PM autosuspend
193 * mechanism to the current time as returned by ktime_get_mono_fast_ns().
195 static inline void pm_runtime_mark_last_busy(struct device *dev)
197 WRITE_ONCE(dev->power.last_busy, ktime_get_mono_fast_ns());
201 * pm_runtime_is_irq_safe - Check if runtime PM can work in interrupt context.
202 * @dev: Target device.
204 * Return %true if @dev has been marked as an "IRQ-safe" device (with respect
205 * to runtime PM), in which case its runtime PM callabcks can be expected to
206 * work correctly when invoked from interrupt handlers.
208 static inline bool pm_runtime_is_irq_safe(struct device *dev)
210 return dev->power.irq_safe;
213 extern u64 pm_runtime_suspended_time(struct device *dev);
215 #else /* !CONFIG_PM */
217 static inline bool queue_pm_work(struct work_struct *work) { return false; }
219 static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
220 static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
221 static inline int pm_runtime_force_suspend(struct device *dev) { return 0; }
222 static inline int pm_runtime_force_resume(struct device *dev) { return 0; }
224 static inline int __pm_runtime_idle(struct device *dev, int rpmflags)
228 static inline int __pm_runtime_suspend(struct device *dev, int rpmflags)
232 static inline int __pm_runtime_resume(struct device *dev, int rpmflags)
236 static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
240 static inline int pm_runtime_get_if_in_use(struct device *dev)
244 static inline int pm_runtime_get_if_active(struct device *dev,
245 bool ign_usage_count)
249 static inline int __pm_runtime_set_status(struct device *dev,
250 unsigned int status) { return 0; }
251 static inline int pm_runtime_barrier(struct device *dev) { return 0; }
252 static inline void pm_runtime_enable(struct device *dev) {}
253 static inline void __pm_runtime_disable(struct device *dev, bool c) {}
254 static inline void pm_runtime_allow(struct device *dev) {}
255 static inline void pm_runtime_forbid(struct device *dev) {}
257 static inline void pm_suspend_ignore_children(struct device *dev, bool enable) {}
258 static inline void pm_runtime_get_noresume(struct device *dev) {}
259 static inline void pm_runtime_put_noidle(struct device *dev) {}
260 static inline bool pm_runtime_suspended(struct device *dev) { return false; }
261 static inline bool pm_runtime_active(struct device *dev) { return true; }
262 static inline bool pm_runtime_status_suspended(struct device *dev) { return false; }
263 static inline bool pm_runtime_enabled(struct device *dev) { return false; }
265 static inline void pm_runtime_no_callbacks(struct device *dev) {}
266 static inline void pm_runtime_irq_safe(struct device *dev) {}
267 static inline bool pm_runtime_is_irq_safe(struct device *dev) { return false; }
269 static inline bool pm_runtime_callbacks_present(struct device *dev) { return false; }
270 static inline void pm_runtime_mark_last_busy(struct device *dev) {}
271 static inline void __pm_runtime_use_autosuspend(struct device *dev,
273 static inline void pm_runtime_set_autosuspend_delay(struct device *dev,
275 static inline u64 pm_runtime_autosuspend_expiration(
276 struct device *dev) { return 0; }
277 static inline void pm_runtime_set_memalloc_noio(struct device *dev,
279 static inline void pm_runtime_clean_up_links(struct device *dev) {}
280 static inline void pm_runtime_get_suppliers(struct device *dev) {}
281 static inline void pm_runtime_put_suppliers(struct device *dev) {}
282 static inline void pm_runtime_new_link(struct device *dev) {}
283 static inline void pm_runtime_drop_link(struct device *dev) {}
285 #endif /* !CONFIG_PM */
288 * pm_runtime_idle - Conditionally set up autosuspend of a device or suspend it.
289 * @dev: Target device.
291 * Invoke the "idle check" callback of @dev and, depending on its return value,
292 * set up autosuspend of @dev or suspend it (depending on whether or not
293 * autosuspend has been enabled for it).
295 static inline int pm_runtime_idle(struct device *dev)
297 return __pm_runtime_idle(dev, 0);
301 * pm_runtime_suspend - Suspend a device synchronously.
302 * @dev: Target device.
304 static inline int pm_runtime_suspend(struct device *dev)
306 return __pm_runtime_suspend(dev, 0);
310 * pm_runtime_autosuspend - Set up autosuspend of a device or suspend it.
311 * @dev: Target device.
313 * Set up autosuspend of @dev or suspend it (depending on whether or not
314 * autosuspend is enabled for it) without engaging its "idle check" callback.
316 static inline int pm_runtime_autosuspend(struct device *dev)
318 return __pm_runtime_suspend(dev, RPM_AUTO);
322 * pm_runtime_resume - Resume a device synchronously.
323 * @dev: Target device.
325 static inline int pm_runtime_resume(struct device *dev)
327 return __pm_runtime_resume(dev, 0);
331 * pm_request_idle - Queue up "idle check" execution for a device.
332 * @dev: Target device.
334 * Queue up a work item to run an equivalent of pm_runtime_idle() for @dev
337 static inline int pm_request_idle(struct device *dev)
339 return __pm_runtime_idle(dev, RPM_ASYNC);
343 * pm_request_resume - Queue up runtime-resume of a device.
344 * @dev: Target device.
346 static inline int pm_request_resume(struct device *dev)
348 return __pm_runtime_resume(dev, RPM_ASYNC);
352 * pm_request_autosuspend - Queue up autosuspend of a device.
353 * @dev: Target device.
355 * Queue up a work item to run an equivalent pm_runtime_autosuspend() for @dev
358 static inline int pm_request_autosuspend(struct device *dev)
360 return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO);
364 * pm_runtime_get - Bump up usage counter and queue up resume of a device.
365 * @dev: Target device.
367 * Bump up the runtime PM usage counter of @dev and queue up a work item to
368 * carry out runtime-resume of it.
370 static inline int pm_runtime_get(struct device *dev)
372 return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC);
376 * pm_runtime_get_sync - Bump up usage counter of a device and resume it.
377 * @dev: Target device.
379 * Bump up the runtime PM usage counter of @dev and carry out runtime-resume of
382 * The possible return values of this function are the same as for
383 * pm_runtime_resume() and the runtime PM usage counter of @dev remains
384 * incremented in all cases, even if it returns an error code.
386 static inline int pm_runtime_get_sync(struct device *dev)
388 return __pm_runtime_resume(dev, RPM_GET_PUT);
392 * pm_runtime_put - Drop device usage counter and queue up "idle check" if 0.
393 * @dev: Target device.
395 * Decrement the runtime PM usage counter of @dev and if it turns out to be
396 * equal to 0, queue up a work item for @dev like in pm_request_idle().
398 static inline int pm_runtime_put(struct device *dev)
400 return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC);
404 * pm_runtime_put_autosuspend - Drop device usage counter and queue autosuspend if 0.
405 * @dev: Target device.
407 * Decrement the runtime PM usage counter of @dev and if it turns out to be
408 * equal to 0, queue up a work item for @dev like in pm_request_autosuspend().
410 static inline int pm_runtime_put_autosuspend(struct device *dev)
412 return __pm_runtime_suspend(dev,
413 RPM_GET_PUT | RPM_ASYNC | RPM_AUTO);
417 * pm_runtime_put_sync - Drop device usage counter and run "idle check" if 0.
418 * @dev: Target device.
420 * Decrement the runtime PM usage counter of @dev and if it turns out to be
421 * equal to 0, invoke the "idle check" callback of @dev and, depending on its
422 * return value, set up autosuspend of @dev or suspend it (depending on whether
423 * or not autosuspend has been enabled for it).
425 * The possible return values of this function are the same as for
426 * pm_runtime_idle() and the runtime PM usage counter of @dev remains
427 * decremented in all cases, even if it returns an error code.
429 static inline int pm_runtime_put_sync(struct device *dev)
431 return __pm_runtime_idle(dev, RPM_GET_PUT);
435 * pm_runtime_put_sync_suspend - Drop device usage counter and suspend if 0.
436 * @dev: Target device.
438 * Decrement the runtime PM usage counter of @dev and if it turns out to be
439 * equal to 0, carry out runtime-suspend of @dev synchronously.
441 * The possible return values of this function are the same as for
442 * pm_runtime_suspend() and the runtime PM usage counter of @dev remains
443 * decremented in all cases, even if it returns an error code.
445 static inline int pm_runtime_put_sync_suspend(struct device *dev)
447 return __pm_runtime_suspend(dev, RPM_GET_PUT);
451 * pm_runtime_put_sync_autosuspend - Drop device usage counter and autosuspend if 0.
452 * @dev: Target device.
454 * Decrement the runtime PM usage counter of @dev and if it turns out to be
455 * equal to 0, set up autosuspend of @dev or suspend it synchronously (depending
456 * on whether or not autosuspend has been enabled for it).
458 * The possible return values of this function are the same as for
459 * pm_runtime_autosuspend() and the runtime PM usage counter of @dev remains
460 * decremented in all cases, even if it returns an error code.
462 static inline int pm_runtime_put_sync_autosuspend(struct device *dev)
464 return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO);
468 * pm_runtime_set_active - Set runtime PM status to "active".
469 * @dev: Target device.
471 * Set the runtime PM status of @dev to %RPM_ACTIVE and ensure that dependencies
472 * of it will be taken into account.
474 * It is not valid to call this function for devices with runtime PM enabled.
476 static inline int pm_runtime_set_active(struct device *dev)
478 return __pm_runtime_set_status(dev, RPM_ACTIVE);
482 * pm_runtime_set_suspended - Set runtime PM status to "active".
483 * @dev: Target device.
485 * Set the runtime PM status of @dev to %RPM_SUSPENDED and ensure that
486 * dependencies of it will be taken into account.
488 * It is not valid to call this function for devices with runtime PM enabled.
490 static inline int pm_runtime_set_suspended(struct device *dev)
492 return __pm_runtime_set_status(dev, RPM_SUSPENDED);
496 * pm_runtime_disable - Disable runtime PM for a device.
497 * @dev: Target device.
499 * Prevent the runtime PM framework from working with @dev (by incrementing its
500 * "blocking" counter).
502 * For each invocation of this function for @dev there must be a matching
503 * pm_runtime_enable() call in order for runtime PM to be enabled for it.
505 static inline void pm_runtime_disable(struct device *dev)
507 __pm_runtime_disable(dev, true);
511 * pm_runtime_use_autosuspend - Allow autosuspend to be used for a device.
512 * @dev: Target device.
514 * Allow the runtime PM autosuspend mechanism to be used for @dev whenever
515 * requested (or "autosuspend" will be handled as direct runtime-suspend for
518 static inline void pm_runtime_use_autosuspend(struct device *dev)
520 __pm_runtime_use_autosuspend(dev, true);
524 * pm_runtime_dont_use_autosuspend - Prevent autosuspend from being used.
525 * @dev: Target device.
527 * Prevent the runtime PM autosuspend mechanism from being used for @dev which
528 * means that "autosuspend" will be handled as direct runtime-suspend for it
531 static inline void pm_runtime_dont_use_autosuspend(struct device *dev)
533 __pm_runtime_use_autosuspend(dev, false);