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PM: runtime: Introduce pm_runtime_blocked()

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Introduce a new helper function called pm_runtime_blocked()
for checking the power.last_status value indicating whether or not
enabling runtime PM for the given device has been blocked (which
happens in the "prepare" phase of system-wide suspend if runtime
PM is disabled for the given device at that point).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://patch.msgid.link/4632087.LvFx2qVVIh@rjwysocki.net
This commit is contained in:
Rafael J. Wysocki 2025-02-18 21:13:09 +01:00
parent 3e5eee147b
commit 758cc55ce3
2 changed files with 19 additions and 0 deletions
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17
drivers/base/power/runtime.c
View File

@ -1555,6 +1555,23 @@ void pm_runtime_enable(struct device *dev)
}
EXPORT_SYMBOL_GPL(pm_runtime_enable);
bool pm_runtime_blocked(struct device *dev)
{
bool ret;
/*
* dev->power.last_status is a bit field, so in case it is updated via
* RMW, read it under the spin lock.
*/
spin_lock_irq(&dev->power.lock);
ret = dev->power.last_status == RPM_BLOCKED;
spin_unlock_irq(&dev->power.lock);
return ret;
}
static void pm_runtime_disable_action(void *data)
{
pm_runtime_dont_use_autosuspend(data);

2
include/linux/pm_runtime.h
View File

@ -81,6 +81,7 @@ extern void pm_runtime_block_if_disabled(struct device *dev);
extern void pm_runtime_unblock(struct device *dev);
extern void pm_runtime_enable(struct device *dev);
extern void __pm_runtime_disable(struct device *dev, bool check_resume);
extern bool pm_runtime_blocked(struct device *dev);
extern void pm_runtime_allow(struct device *dev);
extern void pm_runtime_forbid(struct device *dev);
extern void pm_runtime_no_callbacks(struct device *dev);
@ -277,6 +278,7 @@ static inline void pm_runtime_block_if_disabled(struct device *dev) {}
static inline void pm_runtime_unblock(struct device *dev) {}
static inline void pm_runtime_enable(struct device *dev) {}
static inline void __pm_runtime_disable(struct device *dev, bool c) {}
static inline bool pm_runtime_blocked(struct device *dev) { return true; }
static inline void pm_runtime_allow(struct device *dev) {}
static inline void pm_runtime_forbid(struct device *dev) {}