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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e529192883
Introduce generic "noirq" power management callback routines for subsystems in addition to the "regular" generic PM callback routines. The new routines will be used, among other things, for implementing system-wide PM transitions support for generic PM domains. Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
341 lines
8.7 KiB
C
341 lines
8.7 KiB
C
/*
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* drivers/base/power/generic_ops.c - Generic PM callbacks for subsystems
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*
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* Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
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*
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* This file is released under the GPLv2.
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*/
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#include <linux/pm.h>
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#include <linux/pm_runtime.h>
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#ifdef CONFIG_PM_RUNTIME
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/**
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* pm_generic_runtime_idle - Generic runtime idle callback for subsystems.
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* @dev: Device to handle.
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*
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* If PM operations are defined for the @dev's driver and they include
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* ->runtime_idle(), execute it and return its error code, if nonzero.
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* Otherwise, execute pm_runtime_suspend() for the device and return 0.
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*/
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int pm_generic_runtime_idle(struct device *dev)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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if (pm && pm->runtime_idle) {
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int ret = pm->runtime_idle(dev);
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if (ret)
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return ret;
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}
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pm_runtime_suspend(dev);
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return 0;
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}
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EXPORT_SYMBOL_GPL(pm_generic_runtime_idle);
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/**
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* pm_generic_runtime_suspend - Generic runtime suspend callback for subsystems.
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* @dev: Device to suspend.
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*
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* If PM operations are defined for the @dev's driver and they include
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* ->runtime_suspend(), execute it and return its error code. Otherwise,
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* return 0.
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*/
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int pm_generic_runtime_suspend(struct device *dev)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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int ret;
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ret = pm && pm->runtime_suspend ? pm->runtime_suspend(dev) : 0;
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return ret;
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}
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EXPORT_SYMBOL_GPL(pm_generic_runtime_suspend);
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/**
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* pm_generic_runtime_resume - Generic runtime resume callback for subsystems.
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* @dev: Device to resume.
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*
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* If PM operations are defined for the @dev's driver and they include
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* ->runtime_resume(), execute it and return its error code. Otherwise,
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* return 0.
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*/
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int pm_generic_runtime_resume(struct device *dev)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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int ret;
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ret = pm && pm->runtime_resume ? pm->runtime_resume(dev) : 0;
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return ret;
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}
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EXPORT_SYMBOL_GPL(pm_generic_runtime_resume);
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#endif /* CONFIG_PM_RUNTIME */
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#ifdef CONFIG_PM_SLEEP
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/**
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* pm_generic_prepare - Generic routine preparing a device for power transition.
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* @dev: Device to prepare.
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*
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* Prepare a device for a system-wide power transition.
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*/
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int pm_generic_prepare(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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int ret = 0;
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if (drv && drv->pm && drv->pm->prepare)
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ret = drv->pm->prepare(dev);
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return ret;
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}
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/**
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* __pm_generic_call - Generic suspend/freeze/poweroff/thaw subsystem callback.
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* @dev: Device to handle.
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* @event: PM transition of the system under way.
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* @bool: Whether or not this is the "noirq" stage.
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*
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* If the device has not been suspended at run time, execute the
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* suspend/freeze/poweroff/thaw callback provided by its driver, if defined, and
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* return its error code. Otherwise, return zero.
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*/
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static int __pm_generic_call(struct device *dev, int event, bool noirq)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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int (*callback)(struct device *);
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if (!pm || pm_runtime_suspended(dev))
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return 0;
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switch (event) {
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case PM_EVENT_SUSPEND:
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callback = noirq ? pm->suspend_noirq : pm->suspend;
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break;
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case PM_EVENT_FREEZE:
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callback = noirq ? pm->freeze_noirq : pm->freeze;
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break;
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case PM_EVENT_HIBERNATE:
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callback = noirq ? pm->poweroff_noirq : pm->poweroff;
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break;
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case PM_EVENT_THAW:
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callback = noirq ? pm->thaw_noirq : pm->thaw;
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break;
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default:
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callback = NULL;
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break;
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}
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return callback ? callback(dev) : 0;
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}
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/**
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* pm_generic_suspend_noirq - Generic suspend_noirq callback for subsystems.
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* @dev: Device to suspend.
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*/
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int pm_generic_suspend_noirq(struct device *dev)
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{
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return __pm_generic_call(dev, PM_EVENT_SUSPEND, true);
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}
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EXPORT_SYMBOL_GPL(pm_generic_suspend_noirq);
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/**
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* pm_generic_suspend - Generic suspend callback for subsystems.
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* @dev: Device to suspend.
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*/
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int pm_generic_suspend(struct device *dev)
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{
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return __pm_generic_call(dev, PM_EVENT_SUSPEND, false);
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}
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EXPORT_SYMBOL_GPL(pm_generic_suspend);
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/**
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* pm_generic_freeze_noirq - Generic freeze_noirq callback for subsystems.
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* @dev: Device to freeze.
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*/
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int pm_generic_freeze_noirq(struct device *dev)
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{
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return __pm_generic_call(dev, PM_EVENT_FREEZE, true);
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}
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EXPORT_SYMBOL_GPL(pm_generic_freeze_noirq);
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/**
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* pm_generic_freeze - Generic freeze callback for subsystems.
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* @dev: Device to freeze.
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*/
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int pm_generic_freeze(struct device *dev)
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{
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return __pm_generic_call(dev, PM_EVENT_FREEZE, false);
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}
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EXPORT_SYMBOL_GPL(pm_generic_freeze);
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/**
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* pm_generic_poweroff_noirq - Generic poweroff_noirq callback for subsystems.
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* @dev: Device to handle.
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*/
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int pm_generic_poweroff_noirq(struct device *dev)
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{
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return __pm_generic_call(dev, PM_EVENT_HIBERNATE, true);
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}
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EXPORT_SYMBOL_GPL(pm_generic_poweroff_noirq);
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/**
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* pm_generic_poweroff - Generic poweroff callback for subsystems.
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* @dev: Device to handle.
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*/
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int pm_generic_poweroff(struct device *dev)
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{
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return __pm_generic_call(dev, PM_EVENT_HIBERNATE, false);
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}
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EXPORT_SYMBOL_GPL(pm_generic_poweroff);
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/**
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* pm_generic_thaw_noirq - Generic thaw_noirq callback for subsystems.
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* @dev: Device to thaw.
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*/
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int pm_generic_thaw_noirq(struct device *dev)
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{
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return __pm_generic_call(dev, PM_EVENT_THAW, true);
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}
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EXPORT_SYMBOL_GPL(pm_generic_thaw_noirq);
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/**
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* pm_generic_thaw - Generic thaw callback for subsystems.
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* @dev: Device to thaw.
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*/
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int pm_generic_thaw(struct device *dev)
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{
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return __pm_generic_call(dev, PM_EVENT_THAW, false);
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}
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EXPORT_SYMBOL_GPL(pm_generic_thaw);
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/**
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* __pm_generic_resume - Generic resume/restore callback for subsystems.
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* @dev: Device to handle.
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* @event: PM transition of the system under way.
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* @bool: Whether or not this is the "noirq" stage.
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*
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* Execute the resume/resotre callback provided by the @dev's driver, if
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* defined. If it returns 0, change the device's runtime PM status to 'active'.
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* Return the callback's error code.
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*/
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static int __pm_generic_resume(struct device *dev, int event, bool noirq)
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{
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const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
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int (*callback)(struct device *);
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int ret;
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if (!pm)
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return 0;
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switch (event) {
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case PM_EVENT_RESUME:
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callback = noirq ? pm->resume_noirq : pm->resume;
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break;
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case PM_EVENT_RESTORE:
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callback = noirq ? pm->restore_noirq : pm->restore;
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break;
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default:
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callback = NULL;
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break;
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}
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if (!callback)
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return 0;
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ret = callback(dev);
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if (!ret && !noirq && pm_runtime_enabled(dev)) {
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pm_runtime_disable(dev);
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pm_runtime_set_active(dev);
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pm_runtime_enable(dev);
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}
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return ret;
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}
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/**
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* pm_generic_resume_noirq - Generic resume_noirq callback for subsystems.
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* @dev: Device to resume.
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*/
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int pm_generic_resume_noirq(struct device *dev)
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{
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return __pm_generic_resume(dev, PM_EVENT_RESUME, true);
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}
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EXPORT_SYMBOL_GPL(pm_generic_resume_noirq);
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/**
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* pm_generic_resume - Generic resume callback for subsystems.
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* @dev: Device to resume.
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*/
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int pm_generic_resume(struct device *dev)
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{
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return __pm_generic_resume(dev, PM_EVENT_RESUME, false);
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}
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EXPORT_SYMBOL_GPL(pm_generic_resume);
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/**
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* pm_generic_restore_noirq - Generic restore_noirq callback for subsystems.
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* @dev: Device to restore.
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*/
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int pm_generic_restore_noirq(struct device *dev)
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{
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return __pm_generic_resume(dev, PM_EVENT_RESTORE, true);
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}
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EXPORT_SYMBOL_GPL(pm_generic_restore_noirq);
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/**
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* pm_generic_restore - Generic restore callback for subsystems.
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* @dev: Device to restore.
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*/
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int pm_generic_restore(struct device *dev)
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{
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return __pm_generic_resume(dev, PM_EVENT_RESTORE, false);
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}
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EXPORT_SYMBOL_GPL(pm_generic_restore);
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/**
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* pm_generic_complete - Generic routine competing a device power transition.
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* @dev: Device to handle.
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*
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* Complete a device power transition during a system-wide power transition.
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*/
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void pm_generic_complete(struct device *dev)
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{
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struct device_driver *drv = dev->driver;
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if (drv && drv->pm && drv->pm->complete)
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drv->pm->complete(dev);
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/*
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* Let runtime PM try to suspend devices that haven't been in use before
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* going into the system-wide sleep state we're resuming from.
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*/
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pm_runtime_idle(dev);
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}
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#endif /* CONFIG_PM_SLEEP */
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struct dev_pm_ops generic_subsys_pm_ops = {
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#ifdef CONFIG_PM_SLEEP
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.prepare = pm_generic_prepare,
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.suspend = pm_generic_suspend,
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.suspend_noirq = pm_generic_suspend_noirq,
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.resume = pm_generic_resume,
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.resume_noirq = pm_generic_resume_noirq,
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.freeze = pm_generic_freeze,
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.freeze_noirq = pm_generic_freeze_noirq,
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.thaw = pm_generic_thaw,
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.thaw_noirq = pm_generic_thaw_noirq,
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.poweroff = pm_generic_poweroff,
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.poweroff_noirq = pm_generic_poweroff_noirq,
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.restore = pm_generic_restore,
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.restore_noirq = pm_generic_restore_noirq,
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.complete = pm_generic_complete,
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#endif
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#ifdef CONFIG_PM_RUNTIME
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.runtime_suspend = pm_generic_runtime_suspend,
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.runtime_resume = pm_generic_runtime_resume,
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.runtime_idle = pm_generic_runtime_idle,
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#endif
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};
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EXPORT_SYMBOL_GPL(generic_subsys_pm_ops);
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