556 lines
18 KiB
C
556 lines
18 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* pm_runtime.h - Device run-time power management helper functions.
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*
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* Copyright (C) 2009 Rafael J. Wysocki <rjw@sisk.pl>
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*/
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#ifndef _LINUX_PM_RUNTIME_H
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#define _LINUX_PM_RUNTIME_H
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#include <linux/device.h>
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#include <linux/notifier.h>
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#include <linux/pm.h>
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#include <linux/jiffies.h>
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/* Runtime PM flag argument bits */
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#define RPM_ASYNC 0x01 /* Request is asynchronous */
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#define RPM_NOWAIT 0x02 /* Don't wait for concurrent
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state change */
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#define RPM_GET_PUT 0x04 /* Increment/decrement the
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usage_count */
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#define RPM_AUTO 0x08 /* Use autosuspend_delay */
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#ifdef CONFIG_PM
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extern struct workqueue_struct *pm_wq;
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static inline bool queue_pm_work(struct work_struct *work)
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{
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return queue_work(pm_wq, work);
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}
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extern int pm_generic_runtime_suspend(struct device *dev);
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extern int pm_generic_runtime_resume(struct device *dev);
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extern int pm_runtime_force_suspend(struct device *dev);
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extern int pm_runtime_force_resume(struct device *dev);
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extern int __pm_runtime_idle(struct device *dev, int rpmflags);
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extern int __pm_runtime_suspend(struct device *dev, int rpmflags);
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extern int __pm_runtime_resume(struct device *dev, int rpmflags);
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extern int pm_runtime_get_if_active(struct device *dev, bool ign_usage_count);
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extern int pm_schedule_suspend(struct device *dev, unsigned int delay);
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extern int __pm_runtime_set_status(struct device *dev, unsigned int status);
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extern int pm_runtime_barrier(struct device *dev);
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extern void pm_runtime_enable(struct device *dev);
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extern void __pm_runtime_disable(struct device *dev, bool check_resume);
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extern void pm_runtime_allow(struct device *dev);
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extern void pm_runtime_forbid(struct device *dev);
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extern void pm_runtime_no_callbacks(struct device *dev);
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extern void pm_runtime_irq_safe(struct device *dev);
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extern void __pm_runtime_use_autosuspend(struct device *dev, bool use);
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extern void pm_runtime_set_autosuspend_delay(struct device *dev, int delay);
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extern u64 pm_runtime_autosuspend_expiration(struct device *dev);
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extern void pm_runtime_update_max_time_suspended(struct device *dev,
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s64 delta_ns);
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extern void pm_runtime_set_memalloc_noio(struct device *dev, bool enable);
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extern void pm_runtime_get_suppliers(struct device *dev);
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extern void pm_runtime_put_suppliers(struct device *dev);
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extern void pm_runtime_new_link(struct device *dev);
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extern void pm_runtime_drop_link(struct device_link *link);
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/**
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* pm_runtime_get_if_in_use - Conditionally bump up runtime PM usage counter.
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* @dev: Target device.
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*
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* Increment the runtime PM usage counter of @dev if its runtime PM status is
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* %RPM_ACTIVE and its runtime PM usage counter is greater than 0.
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*/
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static inline int pm_runtime_get_if_in_use(struct device *dev)
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{
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return pm_runtime_get_if_active(dev, false);
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}
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/**
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* pm_suspend_ignore_children - Set runtime PM behavior regarding children.
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* @dev: Target device.
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* @enable: Whether or not to ignore possible dependencies on children.
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*
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* The dependencies of @dev on its children will not be taken into account by
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* the runtime PM framework going forward if @enable is %true, or they will
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* be taken into account otherwise.
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*/
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static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
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{
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dev->power.ignore_children = enable;
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}
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/**
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* pm_runtime_get_noresume - Bump up runtime PM usage counter of a device.
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* @dev: Target device.
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*/
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static inline void pm_runtime_get_noresume(struct device *dev)
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{
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atomic_inc(&dev->power.usage_count);
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}
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/**
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* pm_runtime_put_noidle - Drop runtime PM usage counter of a device.
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* @dev: Target device.
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*
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* Decrement the runtime PM usage counter of @dev unless it is 0 already.
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*/
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static inline void pm_runtime_put_noidle(struct device *dev)
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{
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atomic_add_unless(&dev->power.usage_count, -1, 0);
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}
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/**
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* pm_runtime_suspended - Check whether or not a device is runtime-suspended.
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* @dev: Target device.
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*
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* Return %true if runtime PM is enabled for @dev and its runtime PM status is
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* %RPM_SUSPENDED, or %false otherwise.
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*
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* Note that the return value of this function can only be trusted if it is
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* called under the runtime PM lock of @dev or under conditions in which
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* runtime PM cannot be either disabled or enabled for @dev and its runtime PM
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* status cannot change.
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*/
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static inline bool pm_runtime_suspended(struct device *dev)
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{
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return dev->power.runtime_status == RPM_SUSPENDED
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&& !dev->power.disable_depth;
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}
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/**
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* pm_runtime_active - Check whether or not a device is runtime-active.
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* @dev: Target device.
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*
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* Return %true if runtime PM is enabled for @dev and its runtime PM status is
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* %RPM_ACTIVE, or %false otherwise.
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*
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* Note that the return value of this function can only be trusted if it is
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* called under the runtime PM lock of @dev or under conditions in which
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* runtime PM cannot be either disabled or enabled for @dev and its runtime PM
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* status cannot change.
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*/
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static inline bool pm_runtime_active(struct device *dev)
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{
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return dev->power.runtime_status == RPM_ACTIVE
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|| dev->power.disable_depth;
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}
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/**
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* pm_runtime_status_suspended - Check if runtime PM status is "suspended".
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* @dev: Target device.
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*
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* Return %true if the runtime PM status of @dev is %RPM_SUSPENDED, or %false
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* otherwise, regardless of whether or not runtime PM has been enabled for @dev.
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*
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* Note that the return value of this function can only be trusted if it is
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* called under the runtime PM lock of @dev or under conditions in which the
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* runtime PM status of @dev cannot change.
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*/
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static inline bool pm_runtime_status_suspended(struct device *dev)
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{
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return dev->power.runtime_status == RPM_SUSPENDED;
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}
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/**
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* pm_runtime_enabled - Check if runtime PM is enabled.
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* @dev: Target device.
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*
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* Return %true if runtime PM is enabled for @dev or %false otherwise.
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*
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* Note that the return value of this function can only be trusted if it is
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* called under the runtime PM lock of @dev or under conditions in which
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* runtime PM cannot be either disabled or enabled for @dev.
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*/
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static inline bool pm_runtime_enabled(struct device *dev)
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{
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return !dev->power.disable_depth;
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}
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/**
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* pm_runtime_has_no_callbacks - Check if runtime PM callbacks may be present.
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* @dev: Target device.
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*
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* Return %true if @dev is a special device without runtime PM callbacks or
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* %false otherwise.
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*/
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static inline bool pm_runtime_has_no_callbacks(struct device *dev)
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{
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return dev->power.no_callbacks;
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}
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/**
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* pm_runtime_mark_last_busy - Update the last access time of a device.
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* @dev: Target device.
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*
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* Update the last access time of @dev used by the runtime PM autosuspend
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* mechanism to the current time as returned by ktime_get_mono_fast_ns().
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*/
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static inline void pm_runtime_mark_last_busy(struct device *dev)
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{
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WRITE_ONCE(dev->power.last_busy, ktime_get_mono_fast_ns());
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}
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/**
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* pm_runtime_is_irq_safe - Check if runtime PM can work in interrupt context.
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* @dev: Target device.
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*
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* Return %true if @dev has been marked as an "IRQ-safe" device (with respect
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* to runtime PM), in which case its runtime PM callabcks can be expected to
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* work correctly when invoked from interrupt handlers.
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*/
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static inline bool pm_runtime_is_irq_safe(struct device *dev)
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{
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return dev->power.irq_safe;
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}
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extern u64 pm_runtime_suspended_time(struct device *dev);
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#else /* !CONFIG_PM */
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static inline bool queue_pm_work(struct work_struct *work) { return false; }
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static inline int pm_generic_runtime_suspend(struct device *dev) { return 0; }
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static inline int pm_generic_runtime_resume(struct device *dev) { return 0; }
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static inline int pm_runtime_force_suspend(struct device *dev) { return 0; }
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static inline int pm_runtime_force_resume(struct device *dev) { return 0; }
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static inline int __pm_runtime_idle(struct device *dev, int rpmflags)
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{
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return -ENOSYS;
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}
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static inline int __pm_runtime_suspend(struct device *dev, int rpmflags)
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{
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return -ENOSYS;
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}
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static inline int __pm_runtime_resume(struct device *dev, int rpmflags)
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{
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return 1;
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}
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static inline int pm_schedule_suspend(struct device *dev, unsigned int delay)
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{
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return -ENOSYS;
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}
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static inline int pm_runtime_get_if_in_use(struct device *dev)
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{
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return -EINVAL;
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}
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static inline int pm_runtime_get_if_active(struct device *dev,
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bool ign_usage_count)
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{
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return -EINVAL;
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}
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static inline int __pm_runtime_set_status(struct device *dev,
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unsigned int status) { return 0; }
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static inline int pm_runtime_barrier(struct device *dev) { return 0; }
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static inline void pm_runtime_enable(struct device *dev) {}
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static inline void __pm_runtime_disable(struct device *dev, bool c) {}
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static inline void pm_runtime_allow(struct device *dev) {}
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static inline void pm_runtime_forbid(struct device *dev) {}
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static inline void pm_suspend_ignore_children(struct device *dev, bool enable) {}
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static inline void pm_runtime_get_noresume(struct device *dev) {}
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static inline void pm_runtime_put_noidle(struct device *dev) {}
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static inline bool pm_runtime_suspended(struct device *dev) { return false; }
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static inline bool pm_runtime_active(struct device *dev) { return true; }
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static inline bool pm_runtime_status_suspended(struct device *dev) { return false; }
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static inline bool pm_runtime_enabled(struct device *dev) { return false; }
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static inline void pm_runtime_no_callbacks(struct device *dev) {}
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static inline void pm_runtime_irq_safe(struct device *dev) {}
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static inline bool pm_runtime_is_irq_safe(struct device *dev) { return false; }
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static inline bool pm_runtime_has_no_callbacks(struct device *dev) { return false; }
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static inline void pm_runtime_mark_last_busy(struct device *dev) {}
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static inline void __pm_runtime_use_autosuspend(struct device *dev,
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bool use) {}
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static inline void pm_runtime_set_autosuspend_delay(struct device *dev,
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int delay) {}
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static inline u64 pm_runtime_autosuspend_expiration(
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struct device *dev) { return 0; }
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static inline void pm_runtime_set_memalloc_noio(struct device *dev,
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bool enable){}
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static inline void pm_runtime_get_suppliers(struct device *dev) {}
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static inline void pm_runtime_put_suppliers(struct device *dev) {}
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static inline void pm_runtime_new_link(struct device *dev) {}
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static inline void pm_runtime_drop_link(struct device_link *link) {}
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#endif /* !CONFIG_PM */
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/**
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* pm_runtime_idle - Conditionally set up autosuspend of a device or suspend it.
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* @dev: Target device.
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*
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* Invoke the "idle check" callback of @dev and, depending on its return value,
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* set up autosuspend of @dev or suspend it (depending on whether or not
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* autosuspend has been enabled for it).
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*/
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static inline int pm_runtime_idle(struct device *dev)
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{
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return __pm_runtime_idle(dev, 0);
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}
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/**
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* pm_runtime_suspend - Suspend a device synchronously.
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* @dev: Target device.
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*/
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static inline int pm_runtime_suspend(struct device *dev)
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{
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return __pm_runtime_suspend(dev, 0);
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}
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/**
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* pm_runtime_autosuspend - Set up autosuspend of a device or suspend it.
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* @dev: Target device.
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*
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* Set up autosuspend of @dev or suspend it (depending on whether or not
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* autosuspend is enabled for it) without engaging its "idle check" callback.
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*/
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static inline int pm_runtime_autosuspend(struct device *dev)
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{
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return __pm_runtime_suspend(dev, RPM_AUTO);
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}
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/**
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* pm_runtime_resume - Resume a device synchronously.
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* @dev: Target device.
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*/
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static inline int pm_runtime_resume(struct device *dev)
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{
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return __pm_runtime_resume(dev, 0);
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}
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/**
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* pm_request_idle - Queue up "idle check" execution for a device.
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* @dev: Target device.
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*
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* Queue up a work item to run an equivalent of pm_runtime_idle() for @dev
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* asynchronously.
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*/
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static inline int pm_request_idle(struct device *dev)
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{
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return __pm_runtime_idle(dev, RPM_ASYNC);
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}
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/**
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* pm_request_resume - Queue up runtime-resume of a device.
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* @dev: Target device.
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*/
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static inline int pm_request_resume(struct device *dev)
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{
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return __pm_runtime_resume(dev, RPM_ASYNC);
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}
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/**
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* pm_request_autosuspend - Queue up autosuspend of a device.
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* @dev: Target device.
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*
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* Queue up a work item to run an equivalent pm_runtime_autosuspend() for @dev
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* asynchronously.
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*/
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static inline int pm_request_autosuspend(struct device *dev)
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{
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return __pm_runtime_suspend(dev, RPM_ASYNC | RPM_AUTO);
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}
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/**
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* pm_runtime_get - Bump up usage counter and queue up resume of a device.
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* @dev: Target device.
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*
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* Bump up the runtime PM usage counter of @dev and queue up a work item to
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* carry out runtime-resume of it.
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*/
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static inline int pm_runtime_get(struct device *dev)
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{
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return __pm_runtime_resume(dev, RPM_GET_PUT | RPM_ASYNC);
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}
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/**
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* pm_runtime_get_sync - Bump up usage counter of a device and resume it.
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* @dev: Target device.
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*
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* Bump up the runtime PM usage counter of @dev and carry out runtime-resume of
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* it synchronously.
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*
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* The possible return values of this function are the same as for
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* pm_runtime_resume() and the runtime PM usage counter of @dev remains
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* incremented in all cases, even if it returns an error code.
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*/
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static inline int pm_runtime_get_sync(struct device *dev)
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{
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return __pm_runtime_resume(dev, RPM_GET_PUT);
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}
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/**
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* pm_runtime_resume_and_get - Bump up usage counter of a device and resume it.
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* @dev: Target device.
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*
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* Resume @dev synchronously and if that is successful, increment its runtime
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* PM usage counter. Return 0 if the runtime PM usage counter of @dev has been
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* incremented or a negative error code otherwise.
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*/
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static inline int pm_runtime_resume_and_get(struct device *dev)
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{
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int ret;
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ret = __pm_runtime_resume(dev, RPM_GET_PUT);
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if (ret < 0) {
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pm_runtime_put_noidle(dev);
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return ret;
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}
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return 0;
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}
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/**
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* pm_runtime_put - Drop device usage counter and queue up "idle check" if 0.
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* @dev: Target device.
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*
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* Decrement the runtime PM usage counter of @dev and if it turns out to be
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* equal to 0, queue up a work item for @dev like in pm_request_idle().
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*/
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static inline int pm_runtime_put(struct device *dev)
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{
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return __pm_runtime_idle(dev, RPM_GET_PUT | RPM_ASYNC);
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}
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/**
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* pm_runtime_put_autosuspend - Drop device usage counter and queue autosuspend if 0.
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* @dev: Target device.
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*
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* Decrement the runtime PM usage counter of @dev and if it turns out to be
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* equal to 0, queue up a work item for @dev like in pm_request_autosuspend().
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*/
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static inline int pm_runtime_put_autosuspend(struct device *dev)
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{
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return __pm_runtime_suspend(dev,
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RPM_GET_PUT | RPM_ASYNC | RPM_AUTO);
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}
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/**
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* pm_runtime_put_sync - Drop device usage counter and run "idle check" if 0.
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* @dev: Target device.
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*
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* Decrement the runtime PM usage counter of @dev and if it turns out to be
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* equal to 0, invoke the "idle check" callback of @dev and, depending on its
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* return value, set up autosuspend of @dev or suspend it (depending on whether
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* or not autosuspend has been enabled for it).
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*
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* The possible return values of this function are the same as for
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* pm_runtime_idle() and the runtime PM usage counter of @dev remains
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* decremented in all cases, even if it returns an error code.
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*/
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static inline int pm_runtime_put_sync(struct device *dev)
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{
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return __pm_runtime_idle(dev, RPM_GET_PUT);
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}
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/**
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* pm_runtime_put_sync_suspend - Drop device usage counter and suspend if 0.
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* @dev: Target device.
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*
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* Decrement the runtime PM usage counter of @dev and if it turns out to be
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* equal to 0, carry out runtime-suspend of @dev synchronously.
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*
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* The possible return values of this function are the same as for
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* pm_runtime_suspend() and the runtime PM usage counter of @dev remains
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* decremented in all cases, even if it returns an error code.
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*/
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static inline int pm_runtime_put_sync_suspend(struct device *dev)
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{
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return __pm_runtime_suspend(dev, RPM_GET_PUT);
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}
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/**
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* pm_runtime_put_sync_autosuspend - Drop device usage counter and autosuspend if 0.
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* @dev: Target device.
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*
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* Decrement the runtime PM usage counter of @dev and if it turns out to be
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* equal to 0, set up autosuspend of @dev or suspend it synchronously (depending
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* on whether or not autosuspend has been enabled for it).
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*
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* The possible return values of this function are the same as for
|
|
* pm_runtime_autosuspend() and the runtime PM usage counter of @dev remains
|
|
* decremented in all cases, even if it returns an error code.
|
|
*/
|
|
static inline int pm_runtime_put_sync_autosuspend(struct device *dev)
|
|
{
|
|
return __pm_runtime_suspend(dev, RPM_GET_PUT | RPM_AUTO);
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_set_active - Set runtime PM status to "active".
|
|
* @dev: Target device.
|
|
*
|
|
* Set the runtime PM status of @dev to %RPM_ACTIVE and ensure that dependencies
|
|
* of it will be taken into account.
|
|
*
|
|
* It is not valid to call this function for devices with runtime PM enabled.
|
|
*/
|
|
static inline int pm_runtime_set_active(struct device *dev)
|
|
{
|
|
return __pm_runtime_set_status(dev, RPM_ACTIVE);
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_set_suspended - Set runtime PM status to "suspended".
|
|
* @dev: Target device.
|
|
*
|
|
* Set the runtime PM status of @dev to %RPM_SUSPENDED and ensure that
|
|
* dependencies of it will be taken into account.
|
|
*
|
|
* It is not valid to call this function for devices with runtime PM enabled.
|
|
*/
|
|
static inline int pm_runtime_set_suspended(struct device *dev)
|
|
{
|
|
return __pm_runtime_set_status(dev, RPM_SUSPENDED);
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_disable - Disable runtime PM for a device.
|
|
* @dev: Target device.
|
|
*
|
|
* Prevent the runtime PM framework from working with @dev (by incrementing its
|
|
* "blocking" counter).
|
|
*
|
|
* For each invocation of this function for @dev there must be a matching
|
|
* pm_runtime_enable() call in order for runtime PM to be enabled for it.
|
|
*/
|
|
static inline void pm_runtime_disable(struct device *dev)
|
|
{
|
|
__pm_runtime_disable(dev, true);
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_use_autosuspend - Allow autosuspend to be used for a device.
|
|
* @dev: Target device.
|
|
*
|
|
* Allow the runtime PM autosuspend mechanism to be used for @dev whenever
|
|
* requested (or "autosuspend" will be handled as direct runtime-suspend for
|
|
* it).
|
|
*/
|
|
static inline void pm_runtime_use_autosuspend(struct device *dev)
|
|
{
|
|
__pm_runtime_use_autosuspend(dev, true);
|
|
}
|
|
|
|
/**
|
|
* pm_runtime_dont_use_autosuspend - Prevent autosuspend from being used.
|
|
* @dev: Target device.
|
|
*
|
|
* Prevent the runtime PM autosuspend mechanism from being used for @dev which
|
|
* means that "autosuspend" will be handled as direct runtime-suspend for it
|
|
* going forward.
|
|
*/
|
|
static inline void pm_runtime_dont_use_autosuspend(struct device *dev)
|
|
{
|
|
__pm_runtime_use_autosuspend(dev, false);
|
|
}
|
|
|
|
#endif
|