[RFC][PATCH v1 15/15] perf: export tracepoint events via sysfs: mac80211

[Lin Ming <ming.m.lin@intel.com>]

mac80211 tracepoint events are exported like below,

/sys/class/ieee80211/events/
|-- api_beacon_loss
|   |-- config
|   |-- type
....
....
|-- drv_add_interface
|   |-- config
|   |-- type
....
....
|-- stop_queue
|   |-- config
|   |-- type
|-- wake_queue
|   |-- config
|   |-- type
---
 drivers/base/class.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/drivers/base/class.c b/drivers/base/class.c
index 8e231d0..57ada53 100644
--- a/drivers/base/class.c
+++ b/drivers/base/class.c
@@ -19,6 +19,7 @@
 #include <linux/slab.h>
 #include <linux/genhd.h>
 #include <linux/mutex.h>
+#include <linux/perf_event.h>
 #include "base.h"
 
 #define to_class_attr(_attr) container_of(_attr, struct class_attribute, attr)
@@ -160,6 +161,14 @@ static void klist_class_dev_put(struct klist_node *n)
 	put_device(dev);
 }
 
+extern struct class ieee80211_class;
+
+static void class_sys_add_tp(struct kobject *class_kobj, struct class *cls)
+{
+	if (cls == &ieee80211_class)
+		perf_sys_add_tp(class_kobj, "mac80211");
+}
+
 int __class_register(struct class *cls, struct lock_class_key *key)
 {
 	struct class_private *cp;
@@ -202,6 +211,9 @@ int __class_register(struct class *cls, struct lock_class_key *key)
 	}
 	error = add_class_attrs(class_get(cls));
 	class_put(cls);
+
+	class_sys_add_tp(&cp->class_subsys.kobj, cls);
+
 	return error;
 }
 EXPORT_SYMBOL_GPL(__class_register);