From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
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@xxxxxxxxx>
Reviewed-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
---
v1 -> v2: Add the R-by, no other changes.
---
drivers/base/power/runtime.c | 17 +++++++++++++++++
include/linux/pm_runtime.h | 2 ++
2 files changed, 19 insertions(+)
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1555,6 +1555,23 @@
}
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);
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -81,6 +81,7 @@
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_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) {}
