2020-06-08 07:45:10

by Chen Yu

Subject: [PATCH 0/2][RFC v2] Change trace point to cover all runtime usage count

Currently some code flow of runtime usage count changes is not covered by
the rpm_runtime_usage tracepoints. Adjust corresponding tracepoints to monitor
all the runtime usage count changes.

Chen Yu (2):
PM-runtime: Move all runtime usage related function to runtime.c
PM-runtime: change the tracepoints to cover all usage_count

drivers/base/power/runtime.c | 50 ++++++++++++++++++++++++++----------
include/linux/pm_runtime.h | 12 ++-------
2 files changed, 38 insertions(+), 24 deletions(-)

--
2.17.1

2020-06-08 07:46:05

by Chen Yu

Subject: [PATCH 1/2][RFC v2] PM-runtime: Move all runtime usage related function to runtime.c

In order to track all the runtime usage count change, move the code
related to runtime usage count change from pm_runtime.h to runtime.c,
so that in runtime.c we can leverage trace event to do the tracking.
Meanwhile export pm_runtime_get_noresume() and pm_runtime_put_noidle()
so the module can use them.

No functional change.

Reported-by: kernel test robot <[email protected]>
Signed-off-by: Chen Yu <[email protected]>
---
drivers/base/power/runtime.c | 12 ++++++++++++
include/linux/pm_runtime.h | 12 ++----------
2 files changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 9f62790f644c..85a248e196ca 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -1738,6 +1738,18 @@ void pm_runtime_drop_link(struct device *dev)
spin_unlock_irq(&dev->power.lock);
}

+void pm_runtime_get_noresume(struct device *dev)
+{
+ atomic_inc(&dev->power.usage_count);
+}
+EXPORT_SYMBOL_GPL(pm_runtime_get_noresume);
+
+void pm_runtime_put_noidle(struct device *dev)
+{
+ atomic_add_unless(&dev->power.usage_count, -1, 0);
+}
+EXPORT_SYMBOL_GPL(pm_runtime_put_noidle);
+
static bool pm_runtime_need_not_resume(struct device *dev)
{
return atomic_read(&dev->power.usage_count) <= 1 &&
diff --git a/include/linux/pm_runtime.h b/include/linux/pm_runtime.h
index 3dbc207bff53..26510fef2acd 100644
--- a/include/linux/pm_runtime.h
+++ b/include/linux/pm_runtime.h
@@ -59,6 +59,8 @@ extern void pm_runtime_get_suppliers(struct device *dev);
extern void pm_runtime_put_suppliers(struct device *dev);
extern void pm_runtime_new_link(struct device *dev);
extern void pm_runtime_drop_link(struct device *dev);
+extern void pm_runtime_get_noresume(struct device *dev);
+extern void pm_runtime_put_noidle(struct device *dev);

static inline int pm_runtime_get_if_in_use(struct device *dev)
{
@@ -70,16 +72,6 @@ static inline void pm_suspend_ignore_children(struct device *dev, bool enable)
dev->power.ignore_children = enable;
}

-static inline void pm_runtime_get_noresume(struct device *dev)
-{
- atomic_inc(&dev->power.usage_count);
-}
-
-static inline void pm_runtime_put_noidle(struct device *dev)
-{
- atomic_add_unless(&dev->power.usage_count, -1, 0);
-}
-
static inline bool pm_runtime_suspended(struct device *dev)
{
return dev->power.runtime_status == RPM_SUSPENDED
--
2.17.1