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linux-stable/drivers/base/power/generic_ops.c
Rafael J. Wysocki 58a1fbbb2e PM / PCI / ACPI: Kick devices that might have been reset by firmware 
There is a concern that if the platform firmware was involved in
the system resume that's being completed,  some devices might have
been reset by it and if those devices had the power.direct_complete
flag set during the preceding suspend transition, they may stay
in a reset-power-on state indefinitely (until they are runtime-resumed
and then suspended again).  That may not be a big deal from the
individual device's perspective, but if the system is an SoC, it may
be prevented from entering deep SoC-wide low-power states on idle
because of that.

The devices that are most likely to be affected by this issue are
PCI devices and ACPI-enumerated devices using the general ACPI PM
domain, so to prevent it from happening for those devices, force a
runtime resume for them if they have their power.direct_complete
flags set and the platform firmware was involved in the resume
transition currently in progress.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2015-10-14 02:17:34 +02:00

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/*
* drivers/base/power/generic_ops.c - Generic PM callbacks for subsystems
*
* Copyright (c) 2010 Rafael J. Wysocki <rjw@sisk.pl>, Novell Inc.
*
* This file is released under the GPLv2.
*/
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/export.h>
#include <linux/suspend.h>
#ifdef CONFIG_PM
/**
* pm_generic_runtime_suspend - Generic runtime suspend callback for subsystems.
* @dev: Device to suspend.
*
* If PM operations are defined for the @dev's driver and they include
* ->runtime_suspend(), execute it and return its error code. Otherwise,
* return 0.
*/
int pm_generic_runtime_suspend(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int ret;
ret = pm && pm->runtime_suspend ? pm->runtime_suspend(dev) : 0;
return ret;
}
EXPORT_SYMBOL_GPL(pm_generic_runtime_suspend);
/**
* pm_generic_runtime_resume - Generic runtime resume callback for subsystems.
* @dev: Device to resume.
*
* If PM operations are defined for the @dev's driver and they include
* ->runtime_resume(), execute it and return its error code. Otherwise,
* return 0.
*/
int pm_generic_runtime_resume(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int ret;
ret = pm && pm->runtime_resume ? pm->runtime_resume(dev) : 0;
return ret;
}
EXPORT_SYMBOL_GPL(pm_generic_runtime_resume);
#endif /* CONFIG_PM */
#ifdef CONFIG_PM_SLEEP
/**
* pm_generic_prepare - Generic routine preparing a device for power transition.
* @dev: Device to prepare.
*
* Prepare a device for a system-wide power transition.
*/
int pm_generic_prepare(struct device *dev)
{
struct device_driver *drv = dev->driver;
int ret = 0;
if (drv && drv->pm && drv->pm->prepare)
ret = drv->pm->prepare(dev);
return ret;
}
/**
* pm_generic_suspend_noirq - Generic suspend_noirq callback for subsystems.
* @dev: Device to suspend.
*/
int pm_generic_suspend_noirq(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->suspend_noirq ? pm->suspend_noirq(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_suspend_noirq);
/**
* pm_generic_suspend_late - Generic suspend_late callback for subsystems.
* @dev: Device to suspend.
*/
int pm_generic_suspend_late(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->suspend_late ? pm->suspend_late(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_suspend_late);
/**
* pm_generic_suspend - Generic suspend callback for subsystems.
* @dev: Device to suspend.
*/
int pm_generic_suspend(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->suspend ? pm->suspend(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_suspend);
/**
* pm_generic_freeze_noirq - Generic freeze_noirq callback for subsystems.
* @dev: Device to freeze.
*/
int pm_generic_freeze_noirq(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->freeze_noirq ? pm->freeze_noirq(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_freeze_noirq);
/**
* pm_generic_freeze_late - Generic freeze_late callback for subsystems.
* @dev: Device to freeze.
*/
int pm_generic_freeze_late(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->freeze_late ? pm->freeze_late(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_freeze_late);
/**
* pm_generic_freeze - Generic freeze callback for subsystems.
* @dev: Device to freeze.
*/
int pm_generic_freeze(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->freeze ? pm->freeze(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_freeze);
/**
* pm_generic_poweroff_noirq - Generic poweroff_noirq callback for subsystems.
* @dev: Device to handle.
*/
int pm_generic_poweroff_noirq(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->poweroff_noirq ? pm->poweroff_noirq(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_poweroff_noirq);
/**
* pm_generic_poweroff_late - Generic poweroff_late callback for subsystems.
* @dev: Device to handle.
*/
int pm_generic_poweroff_late(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->poweroff_late ? pm->poweroff_late(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_poweroff_late);
/**
* pm_generic_poweroff - Generic poweroff callback for subsystems.
* @dev: Device to handle.
*/
int pm_generic_poweroff(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->poweroff ? pm->poweroff(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_poweroff);
/**
* pm_generic_thaw_noirq - Generic thaw_noirq callback for subsystems.
* @dev: Device to thaw.
*/
int pm_generic_thaw_noirq(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->thaw_noirq ? pm->thaw_noirq(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_thaw_noirq);
/**
* pm_generic_thaw_early - Generic thaw_early callback for subsystems.
* @dev: Device to thaw.
*/
int pm_generic_thaw_early(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->thaw_early ? pm->thaw_early(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_thaw_early);
/**
* pm_generic_thaw - Generic thaw callback for subsystems.
* @dev: Device to thaw.
*/
int pm_generic_thaw(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->thaw ? pm->thaw(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_thaw);
/**
* pm_generic_resume_noirq - Generic resume_noirq callback for subsystems.
* @dev: Device to resume.
*/
int pm_generic_resume_noirq(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->resume_noirq ? pm->resume_noirq(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_resume_noirq);
/**
* pm_generic_resume_early - Generic resume_early callback for subsystems.
* @dev: Device to resume.
*/
int pm_generic_resume_early(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->resume_early ? pm->resume_early(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_resume_early);
/**
* pm_generic_resume - Generic resume callback for subsystems.
* @dev: Device to resume.
*/
int pm_generic_resume(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->resume ? pm->resume(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_resume);
/**
* pm_generic_restore_noirq - Generic restore_noirq callback for subsystems.
* @dev: Device to restore.
*/
int pm_generic_restore_noirq(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->restore_noirq ? pm->restore_noirq(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_restore_noirq);
/**
* pm_generic_restore_early - Generic restore_early callback for subsystems.
* @dev: Device to resume.
*/
int pm_generic_restore_early(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->restore_early ? pm->restore_early(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_restore_early);
/**
* pm_generic_restore - Generic restore callback for subsystems.
* @dev: Device to restore.
*/
int pm_generic_restore(struct device *dev)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
return pm && pm->restore ? pm->restore(dev) : 0;
}
EXPORT_SYMBOL_GPL(pm_generic_restore);
/**
* pm_generic_complete - Generic routine completing a device power transition.
* @dev: Device to handle.
*
* Complete a device power transition during a system-wide power transition.
*/
void pm_generic_complete(struct device *dev)
{
struct device_driver *drv = dev->driver;
if (drv && drv->pm && drv->pm->complete)
drv->pm->complete(dev);
}
/**
* pm_complete_with_resume_check - Complete a device power transition.
* @dev: Device to handle.
*
* Complete a device power transition during a system-wide power transition and
* optionally schedule a runtime resume of the device if the system resume in
* progress has been initated by the platform firmware and the device had its
* power.direct_complete flag set.
*/
void pm_complete_with_resume_check(struct device *dev)
{
pm_generic_complete(dev);
/*
* If the device had been runtime-suspended before the system went into
* the sleep state it is going out of and it has never been resumed till
* now, resume it in case the firmware powered it up.
*/
if (dev->power.direct_complete && pm_resume_via_firmware())
pm_request_resume(dev);
}
EXPORT_SYMBOL_GPL(pm_complete_with_resume_check);
#endif /* CONFIG_PM_SLEEP */
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