[PATCH] rtpm-core: enable counters for PM state transitions

[Sundar Iyer <sundar.iyer@xxxxxxxxx>]

Add usage counters for every runtime suspend/resume
to enable runtime characteristics debug

Change-Id: I174dbf3ffc4161eb9baf597ae545a1bc4108e516
Signed-off-by: Sundar Iyer <sundar.iyer@xxxxxxxxx>
---
 drivers/base/power/runtime.c |    6 +++++
 drivers/base/power/sysfs.c   |   44 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/pm.h           |    2 +
 3 files changed, 52 insertions(+), 0 deletions(-)

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 1f339d5..5895bc2 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -52,6 +52,10 @@ static void __update_runtime_status(struct device *dev, enum rpm_status status)
 	update_pm_runtime_accounting(dev);
 	trace_runtime_pm_status(dev, status);
 	dev->power.runtime_status = status;
+	if (status == RPM_SUSPENDED)
+		atomic_inc(&dev->power.suspend_transition_count);
+	else if (status == RPM_ACTIVE)
+		atomic_inc(&dev->power.resume_transition_count);
 }
 
 /**
@@ -1240,6 +1244,8 @@ void pm_runtime_init(struct device *dev)
 
 	dev->power.disable_depth = 1;
 	atomic_set(&dev->power.usage_count, 0);
+	atomic_set(&dev->power.suspend_transition_count, 0);
+	atomic_set(&dev->power.resume_transition_count, 0);
 
 	dev->power.runtime_error = 0;
 
diff --git a/drivers/base/power/sysfs.c b/drivers/base/power/sysfs.c
index a9f5b89..32c372e 100644
--- a/drivers/base/power/sysfs.c
+++ b/drivers/base/power/sysfs.c
@@ -186,6 +186,46 @@ static ssize_t rtpm_status_show(struct device *dev,
 
 static DEVICE_ATTR(runtime_status, 0444, rtpm_status_show, NULL);
 
+static ssize_t suspend_transition_count_store(struct device *dev,
+		struct device_attribute *attr, char *buf, size_t n)
+{
+	atomic_set(&dev->power.suspend_transition_count, 0);
+
+	return n;
+}
+
+static ssize_t suspend_transition_count_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n",
+			atomic_read(&dev->power.suspend_transition_count));
+}
+
+static DEVICE_ATTR(runtime_suspend_transition, 0644,
+		suspend_transition_count_show,
+		suspend_transition_count_store);
+
+static ssize_t resume_transition_count_store(struct device *dev,
+		struct device_attribute *attr, char *buf, size_t n)
+{
+	atomic_set(&dev->power.resume_transition_count, 0);
+
+	return n;
+}
+
+
+static ssize_t resume_transition_count_show(struct device *dev,
+		struct device_attribute *attr, char *buf)
+{
+	return sprintf(buf, "%d\n",
+			atomic_read(&dev->power.resume_transition_count));
+}
+
+static DEVICE_ATTR(runtime_resume_transition, 0644,
+		resume_transition_count_show,
+		resume_transition_count_store);
+
+
 static ssize_t autosuspend_delay_ms_show(struct device *dev,
 		struct device_attribute *attr, char *buf)
 {
@@ -438,6 +478,8 @@ static struct attribute *power_attrs[] = {
 #endif
 #ifdef CONFIG_PM_RUNTIME
 	&dev_attr_runtime_status.attr,
+	&dev_attr_runtime_suspend_transition.attr,
+	&dev_attr_runtime_resume_transition.attr,
 	&dev_attr_runtime_usage.attr,
 	&dev_attr_runtime_active_kids.attr,
 	&dev_attr_runtime_enabled.attr,
@@ -472,6 +514,8 @@ static struct attribute *runtime_attrs[] = {
 #ifdef CONFIG_PM_RUNTIME
 #ifndef CONFIG_PM_ADVANCED_DEBUG
 	&dev_attr_runtime_status.attr,
+	&dev_attr_runtime_suspend_transition.attr,
+	&dev_attr_runtime_resume_transition.attr,
 #endif
 	&dev_attr_control.attr,
 	&dev_attr_runtime_suspended_time.attr,
diff --git a/include/linux/pm.h b/include/linux/pm.h
index 411e4f4..4001ba2 100644
--- a/include/linux/pm.h
+++ b/include/linux/pm.h
@@ -442,6 +442,8 @@ struct dev_pm_info {
 	wait_queue_head_t	wait_queue;
 	atomic_t		usage_count;
 	atomic_t		child_count;
+	atomic_t		suspend_transition_count;
+	atomic_t		resume_transition_count;
 	unsigned int		disable_depth:3;
 	unsigned int		ignore_children:1;
 	unsigned int		idle_notification:1;
-- 
1.7.0.4