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From: Lin Ming on 22 Jul 2010 07:20
perf: core, add functions to export events via sysfs

---
include/linux/perf_event.h | 13 +++++
kernel/perf_event.c | 110 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 123 insertions(+), 0 deletions(-)

diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
index 0ed315e..5e9f5c6 100644
--- a/include/linux/perf_event.h
+++ b/include/linux/perf_event.h
@@ -1057,6 +1057,9 @@ extern int perf_swevent_get_recursion_context(void);
extern void perf_swevent_put_recursion_context(int rctx);
extern void perf_event_enable(struct perf_event *event);
extern void perf_event_disable(struct perf_event *event);
+
+extern struct kobject *perf_sys_create_events_dir(struct kobject *parent);
+extern int perf_sys_add_event(struct kobject *parent, char *name, u64 config, int type);
#else
static inline void
perf_event_task_sched_in(struct task_struct *task) { }
@@ -1092,6 +1095,16 @@ static inline int perf_swevent_get_recursion_context(void) { return -1; }
static inline void perf_swevent_put_recursion_context(int rctx) { }
static inline void perf_event_enable(struct perf_event *event) { }
static inline void perf_event_disable(struct perf_event *event) { }
+
+static inline int perf_sys_add_event(struct kobject *parent, char *name, u64 config, int type)
+{
+ return 0;
+}
+
+static inline struct kobject *perf_sys_create_events_dir(struct kobject *parent)
+{
+ return NULL;
+}
#endif

#define perf_output_put(handle, x) \
diff --git a/kernel/perf_event.c b/kernel/perf_event.c
index 10945db..26c15a0 100644
--- a/kernel/perf_event.c
+++ b/kernel/perf_event.c
@@ -5888,3 +5888,113 @@ static int __init perf_event_sysfs_init(void)
&perfclass_attr_group);
}
device_initcall(perf_event_sysfs_init);
+
+struct event_kobject {
+ struct kobject *kobj;
+
+ u64 config;
+ int type;
+
+ struct event_kobject *next;
+};
+
+static struct event_kobject *event_kobject_list;
+
+static struct event_kobject *perf_sys_find_event_kobj(struct kobject *kobj)
+{
+ struct event_kobject *event_kobj;
+
+ event_kobj = event_kobject_list;
+
+ while (event_kobj) {
+ if (kobj == event_kobj->kobj)
+ return event_kobj;
+
+ event_kobj = event_kobj->next;
+ }
+
+ return NULL;
+}
+
+#define EVENT_ATTR_RO(_name) \
+ static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
+
+static ssize_t config_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct event_kobject *event_kobj;
+
+ event_kobj = perf_sys_find_event_kobj(kobj);
+
+ return sprintf(buf, "%llx\n", event_kobj->config);
+}
+EVENT_ATTR_RO(config);
+
+static ssize_t type_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct event_kobject *event_kobj;
+
+ event_kobj = perf_sys_find_event_kobj(kobj);
+
+ return sprintf(buf, "%d\n", event_kobj->type);
+}
+EVENT_ATTR_RO(type);
+
+static struct attribute *event_attrs[] = {
+ &config_attr.attr,
+ &type_attr.attr,
+ NULL,
+};
+
+static struct attribute_group event_attr_group = {
+ .attrs = event_attrs,
+};
+
+#define EVENTS_DIR "events"
+struct kobject *perf_sys_create_events_dir(struct kobject *parent)
+{
+ if (!parent)
+ return NULL;
+
+ return kobject_create_and_add(EVENTS_DIR, parent);
+}
+
+static DEFINE_SPINLOCK(sys_events_lock);
+
+int perf_sys_add_event(struct kobject *parent, char *name, u64 config, int type)
+{
+ struct event_kobject *event_kobj;
+ struct kobject *kobj;
+ int err;
+
+ if (!name)
+ return -1;
+
+ kobj = kobject_create_and_add(name, parent);
+ if (!kobj)
+ return -ENOMEM;
+ err = sysfs_create_group(kobj, &event_attr_group);
+ if (err) {
+ kobject_put(kobj);
+ return -ENOMEM;
+ }
+
+ event_kobj = kmalloc(sizeof(*event_kobj), GFP_KERNEL);
+ if (!event_kobj) {
+ kobject_put(kobj);
+ return -ENOMEM;
+ }
+
+ spin_lock(&sys_events_lock);
+
+ event_kobj->kobj = kobj;
+ event_kobj->config = config;
+ event_kobj->type = type;
+ event_kobj->next = event_kobject_list;
+ event_kobject_list = event_kobj;
+
+ spin_unlock(&sys_events_lock);
+
+ return 0;
+}




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Prev: [RFC][PATCH v1 00/15] perf: export events in a structured way via sysfs
Next: perf: export tracepoint events via sysfs: iwlwifi and iwlwifi_io