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PM: Introduce generic "noirq" callback routines for subsystems (v2)

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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>
This commit is contained in:
Rafael J. Wysocki 2011-07-01 22:12:59 +02:00
parent f721889ff6
commit e529192883
3 changed files with 119 additions and 17 deletions
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32
Documentation/power/runtime_pm.txt
View file

@ -606,32 +606,60 @@ driver/base/power/generic_ops.c:
callback provided by its driver and return its result, or return 0 if not
defined
int pm_generic_suspend_noirq(struct device *dev);
- if pm_runtime_suspended(dev) returns "false", invoke the ->suspend_noirq()
callback provided by the device's driver and return its result, or return
0 if not defined
int pm_generic_resume(struct device *dev);
- invoke the ->resume() callback provided by the driver of this device and,
if successful, change the device's runtime PM status to 'active'
int pm_generic_resume_noirq(struct device *dev);
- invoke the ->resume_noirq() callback provided by the driver of this device
int pm_generic_freeze(struct device *dev);
- if the device has not been suspended at run time, invoke the ->freeze()
callback provided by its driver and return its result, or return 0 if not
defined
int pm_generic_freeze_noirq(struct device *dev);
- if pm_runtime_suspended(dev) returns "false", invoke the ->freeze_noirq()
callback provided by the device's driver and return its result, or return
0 if not defined
int pm_generic_thaw(struct device *dev);
- if the device has not been suspended at run time, invoke the ->thaw()
callback provided by its driver and return its result, or return 0 if not
defined
int pm_generic_thaw_noirq(struct device *dev);
- if pm_runtime_suspended(dev) returns "false", invoke the ->thaw_noirq()
callback provided by the device's driver and return its result, or return
0 if not defined
int pm_generic_poweroff(struct device *dev);
- if the device has not been suspended at run time, invoke the ->poweroff()
callback provided by its driver and return its result, or return 0 if not
defined
int pm_generic_poweroff_noirq(struct device *dev);
- if pm_runtime_suspended(dev) returns "false", run the ->poweroff_noirq()
callback provided by the device's driver and return its result, or return
0 if not defined
int pm_generic_restore(struct device *dev);
- invoke the ->restore() callback provided by the driver of this device and,
if successful, change the device's runtime PM status to 'active'
int pm_generic_restore_noirq(struct device *dev);
- invoke the ->restore_noirq() callback provided by the device's driver
These functions can be assigned to the ->runtime_idle(), ->runtime_suspend(),
->runtime_resume(), ->suspend(), ->resume(), ->freeze(), ->thaw(), ->poweroff(),
or ->restore() callback pointers in the subsystem-level dev_pm_ops structures.
->runtime_resume(), ->suspend(), ->suspend_noirq(), ->resume(),
->resume_noirq(), ->freeze(), ->freeze_noirq(), ->thaw(), ->thaw_noirq(),
->poweroff(), ->poweroff_noirq(), ->restore(), ->restore_noirq() callback
pointers in the subsystem-level dev_pm_ops structures.
If a subsystem wishes to use all of them at the same time, it can simply assign
the GENERIC_SUBSYS_PM_OPS macro, defined in include/linux/pm.h, to its

98
drivers/base/power/generic_ops.c
View file

@ -94,12 +94,13 @@ int pm_generic_prepare(struct device *dev)
* __pm_generic_call - Generic suspend/freeze/poweroff/thaw subsystem callback.
* @dev: Device to handle.
* @event: PM transition of the system under way.
* @bool: Whether or not this is the "noirq" stage.
*
* If the device has not been suspended at run time, execute the
* suspend/freeze/poweroff/thaw callback provided by its driver, if defined, and
* return its error code. Otherwise, return zero.
*/
static int __pm_generic_call(struct device *dev, int event)
static int __pm_generic_call(struct device *dev, int event, bool noirq)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int (*callback)(struct device *);
@ -109,16 +110,16 @@ static int __pm_generic_call(struct device *dev, int event)
switch (event) {
case PM_EVENT_SUSPEND:
callback = pm->suspend;
callback = noirq ? pm->suspend_noirq : pm->suspend;
break;
case PM_EVENT_FREEZE:
callback = pm->freeze;
callback = noirq ? pm->freeze_noirq : pm->freeze;
break;
case PM_EVENT_HIBERNATE:
callback = pm->poweroff;
callback = noirq ? pm->poweroff_noirq : pm->poweroff;
break;
case PM_EVENT_THAW:
callback = pm->thaw;
callback = noirq ? pm->thaw_noirq : pm->thaw;
break;
default:
callback = NULL;
@ -128,43 +129,83 @@ static int __pm_generic_call(struct device *dev, int event)
return callback ? callback(dev) : 0;
}
/**
* pm_generic_suspend_noirq - Generic suspend_noirq callback for subsystems.
* @dev: Device to suspend.
*/
int pm_generic_suspend_noirq(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_SUSPEND, true);
}
EXPORT_SYMBOL_GPL(pm_generic_suspend_noirq);
/**
* pm_generic_suspend - Generic suspend callback for subsystems.
* @dev: Device to suspend.
*/
int pm_generic_suspend(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_SUSPEND);
return __pm_generic_call(dev, PM_EVENT_SUSPEND, false);
}
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)
{
return __pm_generic_call(dev, PM_EVENT_FREEZE, true);
}
EXPORT_SYMBOL_GPL(pm_generic_freeze_noirq);
/**
* pm_generic_freeze - Generic freeze callback for subsystems.
* @dev: Device to freeze.
*/
int pm_generic_freeze(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_FREEZE);
return __pm_generic_call(dev, PM_EVENT_FREEZE, false);
}
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)
{
return __pm_generic_call(dev, PM_EVENT_HIBERNATE, true);
}
EXPORT_SYMBOL_GPL(pm_generic_poweroff_noirq);
/**
* pm_generic_poweroff - Generic poweroff callback for subsystems.
* @dev: Device to handle.
*/
int pm_generic_poweroff(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_HIBERNATE);
return __pm_generic_call(dev, PM_EVENT_HIBERNATE, false);
}
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)
{
return __pm_generic_call(dev, PM_EVENT_THAW, true);
}
EXPORT_SYMBOL_GPL(pm_generic_thaw_noirq);
/**
* pm_generic_thaw - Generic thaw callback for subsystems.
* @dev: Device to thaw.
*/
int pm_generic_thaw(struct device *dev)
{
return __pm_generic_call(dev, PM_EVENT_THAW);
return __pm_generic_call(dev, PM_EVENT_THAW, false);
}
EXPORT_SYMBOL_GPL(pm_generic_thaw);
@ -172,12 +213,13 @@ EXPORT_SYMBOL_GPL(pm_generic_thaw);
* __pm_generic_resume - Generic resume/restore callback for subsystems.
* @dev: Device to handle.
* @event: PM transition of the system under way.
* @bool: Whether or not this is the "noirq" stage.
*
* Execute the resume/resotre callback provided by the @dev's driver, if
* defined. If it returns 0, change the device's runtime PM status to 'active'.
* Return the callback's error code.
*/
static int __pm_generic_resume(struct device *dev, int event)
static int __pm_generic_resume(struct device *dev, int event, bool noirq)
{
const struct dev_pm_ops *pm = dev->driver ? dev->driver->pm : NULL;
int (*callback)(struct device *);
@ -188,10 +230,10 @@ static int __pm_generic_resume(struct device *dev, int event)
switch (event) {
case PM_EVENT_RESUME:
callback = pm->resume;
callback = noirq ? pm->resume_noirq : pm->resume;
break;
case PM_EVENT_RESTORE:
callback = pm->restore;
callback = noirq ? pm->restore_noirq : pm->restore;
break;
default:
callback = NULL;
@ -202,7 +244,7 @@ static int __pm_generic_resume(struct device *dev, int event)
return 0;
ret = callback(dev);
if (!ret && pm_runtime_enabled(dev)) {
if (!ret && !noirq && pm_runtime_enabled(dev)) {
pm_runtime_disable(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
@ -211,23 +253,43 @@ static int __pm_generic_resume(struct device *dev, int event)
return ret;
}
/**
* pm_generic_resume_noirq - Generic resume_noirq callback for subsystems.
* @dev: Device to resume.
*/
int pm_generic_resume_noirq(struct device *dev)
{
return __pm_generic_resume(dev, PM_EVENT_RESUME, true);
}
EXPORT_SYMBOL_GPL(pm_generic_resume_noirq);
/**
* pm_generic_resume - Generic resume callback for subsystems.
* @dev: Device to resume.
*/
int pm_generic_resume(struct device *dev)
{
return __pm_generic_resume(dev, PM_EVENT_RESUME);
return __pm_generic_resume(dev, PM_EVENT_RESUME, false);
}
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)
{
return __pm_generic_resume(dev, PM_EVENT_RESTORE, true);
}
EXPORT_SYMBOL_GPL(pm_generic_restore_noirq);
/**
* pm_generic_restore - Generic restore callback for subsystems.
* @dev: Device to restore.
*/
int pm_generic_restore(struct device *dev)
{
return __pm_generic_resume(dev, PM_EVENT_RESTORE);
return __pm_generic_resume(dev, PM_EVENT_RESTORE, false);
}
EXPORT_SYMBOL_GPL(pm_generic_restore);
@ -256,11 +318,17 @@ struct dev_pm_ops generic_subsys_pm_ops = {
#ifdef CONFIG_PM_SLEEP
.prepare = pm_generic_prepare,
.suspend = pm_generic_suspend,
.suspend_noirq = pm_generic_suspend_noirq,
.resume = pm_generic_resume,
.resume_noirq = pm_generic_resume_noirq,
.freeze = pm_generic_freeze,
.freeze_noirq = pm_generic_freeze_noirq,
.thaw = pm_generic_thaw,
.thaw_noirq = pm_generic_thaw_noirq,
.poweroff = pm_generic_poweroff,
.poweroff_noirq = pm_generic_poweroff_noirq,
.restore = pm_generic_restore,
.restore_noirq = pm_generic_restore_noirq,
.complete = pm_generic_complete,
#endif
#ifdef CONFIG_PM_RUNTIME

6
include/linux/pm.h
View file

@ -553,11 +553,17 @@ extern void __suspend_report_result(const char *function, void *fn, int ret);
extern int device_pm_wait_for_dev(struct device *sub, struct device *dev);
extern int pm_generic_prepare(struct device *dev);
extern int pm_generic_suspend_noirq(struct device *dev);
extern int pm_generic_suspend(struct device *dev);
extern int pm_generic_resume_noirq(struct device *dev);
extern int pm_generic_resume(struct device *dev);
extern int pm_generic_freeze_noirq(struct device *dev);
extern int pm_generic_freeze(struct device *dev);
extern int pm_generic_thaw_noirq(struct device *dev);
extern int pm_generic_thaw(struct device *dev);
extern int pm_generic_restore_noirq(struct device *dev);
extern int pm_generic_restore(struct device *dev);
extern int pm_generic_poweroff_noirq(struct device *dev);
extern int pm_generic_poweroff(struct device *dev);
extern void pm_generic_complete(struct device *dev);