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Subject[PATCHv6 2/9] devfreq: event: Add the list of supported devfreq-event type
Date
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@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
---
drivers/devfreq/devfreq-event.c | 58 ++++++++++++++++++++++++++++++++++++-----
include/linux/devfreq-event.h | 25 +++++++++++++++---
2 files changed, 73 insertions(+), 10 deletions(-)

diff --git a/drivers/devfreq/devfreq-event.c b/drivers/devfreq/devfreq-event.c
index 81448ba..64c1764 100644
--- a/drivers/devfreq/devfreq-event.c
+++ b/drivers/devfreq/devfreq-event.c
@@ -20,6 +20,9 @@
#include <linux/list.h>
#include <linux/of.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 */
@@ -132,7 +135,8 @@ 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;

@@ -146,7 +150,15 @@ 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;
@@ -162,6 +174,7 @@ 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;
@@ -175,18 +188,49 @@ 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-event.h b/include/linux/devfreq-event.h
index 6023be8..6b86c1d 100644
--- a/include/linux/devfreq-event.h
+++ b/include/linux/devfreq-event.h
@@ -36,6 +36,14 @@ 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
*
@@ -69,8 +77,10 @@ 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);
};

@@ -79,6 +89,10 @@ 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.
@@ -87,6 +101,7 @@ struct devfreq_event_ops {
struct devfreq_event_desc {
const char *name;
void *driver_data;
+ enum devfreq_event_type type;

struct devfreq_event_ops *ops;
};
@@ -95,8 +110,10 @@ struct devfreq_event_desc {
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);
@@ -123,12 +140,14 @@ 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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