[PATCHv4 2/8] devfreq: event: Add the list of supported devfreq-event type
From: Chanwoo Choi
Date: Tue Dec 16 2014 - 18:27:50 EST
This patch adds the list of supported devfreq-event type as following.
Each devfreq-event device driver would support the various devfreq-event type
for devfreq governor at the same time.
- DEVFREQ_EVENT_TYPE_RAW_DATA
- DEVFREQ_EVENT_TYPE_UTILIZATION
- DEVFREQ_EVENT_TYPE_BANDWIDTH
- DEVFREQ_EVENT_TYPE_LATENCY
Cc: MyungJoo Ham <myungjoo.ham@xxxxxxxxxxx>
Cc: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
---
drivers/devfreq/devfreq-event.c | 58 ++++++++++++++++++++++++++++++++++++-----
include/linux/devfreq.h | 25 +++++++++++++++---
2 files changed, 73 insertions(+), 10 deletions(-)
diff --git a/drivers/devfreq/devfreq-event.c b/drivers/devfreq/devfreq-event.c
index 0e1948e..5b93f1f 100644
--- a/drivers/devfreq/devfreq-event.c
+++ b/drivers/devfreq/devfreq-event.c
@@ -29,6 +29,9 @@
#include <linux/of.h>
#include "governor.h"
+#define EVENT_TYPE_RAW_DATA_MAX ULONG_MAX
+#define EVENT_TYPE_UTILIZATION_MAX 100
+
static struct class *devfreq_event_class;
/* The list of all devfreq event list */
@@ -144,7 +147,8 @@ EXPORT_SYMBOL_GPL(devfreq_event_is_enabled);
* Note that this function set the event to the devfreq-event device to start
* for getting the event data which could be various event type.
*/
-int devfreq_event_set_event(struct devfreq_event_dev *edev)
+int devfreq_event_set_event(struct devfreq_event_dev *edev,
+ enum devfreq_event_type type)
{
int ret;
@@ -158,7 +162,15 @@ int devfreq_event_set_event(struct devfreq_event_dev *edev)
return -EPERM;
mutex_lock(&edev->lock);
- ret = edev->desc->ops->set_event(edev);
+
+ if ((edev->desc->type & type) == 0) {
+ dev_err(&edev->dev, "unsupported devfreq-event type\n");
+ mutex_unlock(&edev->lock);
+ return -EINVAL;
+ }
+
+ ret = edev->desc->ops->set_event(edev, type);
+
mutex_unlock(&edev->lock);
return ret;
@@ -174,6 +186,7 @@ EXPORT_SYMBOL_GPL(devfreq_event_set_event);
* after stoping the progress of whole sequence of devfreq-event dev.
*/
int devfreq_event_get_event(struct devfreq_event_dev *edev,
+ enum devfreq_event_type type,
struct devfreq_event_data *edata)
{
int ret;
@@ -187,18 +200,49 @@ int devfreq_event_get_event(struct devfreq_event_dev *edev,
if (!devfreq_event_is_enabled(edev))
return -EINVAL;
+ mutex_lock(&edev->lock);
+
+ if ((edev->desc->type & type) == 0) {
+ dev_err(&edev->dev, "unsupported devfreq-event type\n");
+ return -EINVAL;
+ }
+
edata->event = edata->total_event = 0;
+ ret = edev->desc->ops->get_event(edev, type, edata);
+ if (ret < 0
+ || edata->total_event <= 0
+ || edata->event > edata->total_event) {
+ edata->event = edata->total_event = 0;
+ mutex_unlock(&edev->lock);
+ return -EINVAL;
+ }
- mutex_lock(&edev->lock);
- ret = edev->desc->ops->get_event(edev, edata);
- mutex_unlock(&edev->lock);
+ switch (type) {
+ case DEVFREQ_EVENT_TYPE_RAW_DATA:
+ case DEVFREQ_EVENT_TYPE_BANDWIDTH:
+ case DEVFREQ_EVENT_TYPE_LATENCY:
+ if ((edata->event > EVENT_TYPE_RAW_DATA_MAX) ||
+ (edata->total_event > EVENT_TYPE_RAW_DATA_MAX)) {
+ edata->event = edata->total_event = 0;
+ ret = -EINVAL;
+ }
+ break;
+ case DEVFREQ_EVENT_TYPE_UTILIZATION:
+ edata->total_event = EVENT_TYPE_UTILIZATION_MAX;
- if ((edata->total_event <= 0)
- || (edata->event > edata->total_event)) {
+ if (edata->event > EVENT_TYPE_UTILIZATION_MAX) {
+ edata->event = edata->total_event = 0;
+ ret = -EINVAL;
+ }
+ break;
+ default:
edata->event = edata->total_event = 0;
ret = -EINVAL;
+ break;
}
+ mutex_unlock(&edev->lock);
+
return ret;
}
EXPORT_SYMBOL_GPL(devfreq_event_get_event);
diff --git a/include/linux/devfreq.h b/include/linux/devfreq.h
index ed85a8c..b424b0d 100644
--- a/include/linux/devfreq.h
+++ b/include/linux/devfreq.h
@@ -197,6 +197,14 @@ struct devfreq_event_dev {
const struct devfreq_event_desc *desc;
};
+/* The supported type by devfreq-event device */
+enum devfreq_event_type {
+ DEVFREQ_EVENT_TYPE_RAW_DATA = BIT(0),
+ DEVFREQ_EVENT_TYPE_UTILIZATION = BIT(1),
+ DEVFREQ_EVENT_TYPE_BANDWIDTH = BIT(2),
+ DEVFREQ_EVENT_TYPE_LATENCY = BIT(3),
+};
+
/**
* struct devfreq_event_data - the devfreq-event data
*
@@ -232,8 +240,10 @@ struct devfreq_event_ops {
int (*reset)(struct devfreq_event_dev *edev);
/* Mandatory functions */
- int (*set_event)(struct devfreq_event_dev *edev);
+ int (*set_event)(struct devfreq_event_dev *edev,
+ enum devfreq_event_type type);
int (*get_event)(struct devfreq_event_dev *edev,
+ enum devfreq_event_type type,
struct devfreq_event_data *edata);
};
@@ -242,6 +252,10 @@ struct devfreq_event_ops {
*
* @name : the name of devfreq-event device.
* @driver_data : the private data for devfreq-event driver.
+ * @event_type : the supported devfreq-event type among as following
+ * - DEVFREQ_EVENT_TYPE_UTILIZATION
+ * - DEVFREQ_EVENT_TYPE_BANDWIDTH
+ * - DEVFREQ_EVENT_TYPE_LATENCY
* @ops : the operation to control devfreq-event device.
*
* Each devfreq-event device is described with a this structure.
@@ -250,6 +264,7 @@ struct devfreq_event_ops {
struct devfreq_event_desc {
const char *name;
void *driver_data;
+ enum devfreq_event_type type;
struct devfreq_event_ops *ops;
};
@@ -287,8 +302,10 @@ extern void devm_devfreq_unregister_opp_notifier(struct device *dev,
extern int devfreq_event_enable_edev(struct devfreq_event_dev *edev);
extern int devfreq_event_disable_edev(struct devfreq_event_dev *edev);
extern bool devfreq_event_is_enabled(struct devfreq_event_dev *edev);
-extern int devfreq_event_set_event(struct devfreq_event_dev *edev);
+extern int devfreq_event_set_event(struct devfreq_event_dev *edev,
+ enum devfreq_event_type type);
extern int devfreq_event_get_event(struct devfreq_event_dev *edev,
+ enum devfreq_event_type type,
struct devfreq_event_data *edata);
extern int devfreq_event_reset_event(struct devfreq_event_dev *edev);
extern void *devfreq_event_get_drvdata(struct devfreq_event_dev *edev);
@@ -411,12 +428,14 @@ static inline bool devfreq_event_is_enabled(struct devfreq_event_dev *edev);
return false;
}
-static inline int devfreq_event_set_event(struct devfreq_event_dev *edev);
+static inline int devfreq_event_set_event(struct devfreq_event_dev *edev,
+ enum devfreq_event_type type)
{
return -EINVAL;
}
static inline int devfreq_event_get_event(struct devfreq_event_dev *edev,
+ enum devfreq_event_type type,
struct devfreq_event_data *edata)
{
return -EINVAL;
--
1.8.5.5
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