tracing: Add basic event trigger framework

[~andy/linux] / kernel / trace / trace_events.c

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index a11800ae96de5d1f098153aaacdb715ba5098493..442775c9dbf378a44fd024553879244f28716d16 100644 (file)
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -342,6 +342,12 @@ static int __ftrace_event_enable_disable(struct ftrace_event_file *file,
        return ret;
 }
 
+int trace_event_enable_disable(struct ftrace_event_file *file,
+                              int enable, int soft_disable)
+{
+       return __ftrace_event_enable_disable(file, enable, soft_disable);
+}
+
 static int ftrace_event_enable_disable(struct ftrace_event_file *file,
                                       int enable)
 {
@@ -421,11 +427,6 @@ static void remove_subsystem(struct ftrace_subsystem_dir *dir)
        }
 }
 
-static void *event_file_data(struct file *filp)
-{
-       return ACCESS_ONCE(file_inode(filp)->i_private);
-}
-
 static void remove_event_file_dir(struct ftrace_event_file *file)
 {
        struct dentry *dir = file->dir;
@@ -1549,6 +1550,9 @@ event_create_dir(struct dentry *parent, struct ftrace_event_file *file)
        trace_create_file("filter", 0644, file->dir, file,
                          &ftrace_event_filter_fops);
 
+       trace_create_file("trigger", 0644, file->dir, file,
+                         &event_trigger_fops);
+
        trace_create_file("format", 0444, file->dir, call,
                          &ftrace_event_format_fops);
 
@@ -1645,6 +1649,8 @@ trace_create_new_event(struct ftrace_event_call *call,
        file->event_call = call;
        file->tr = tr;
        atomic_set(&file->sm_ref, 0);
+       atomic_set(&file->tm_ref, 0);
+       INIT_LIST_HEAD(&file->triggers);
        list_add(&file->list, &tr->events);
 
        return file;
@@ -2311,6 +2317,9 @@ int event_trace_del_tracer(struct trace_array *tr)
 {
        mutex_lock(&event_mutex);
 
+       /* Disable any event triggers and associated soft-disabled events */
+       clear_event_triggers(tr);
+
        /* Disable any running events */
        __ftrace_set_clr_event_nolock(tr, NULL, NULL, NULL, 0);
 
@@ -2377,6 +2386,8 @@ static __init int event_trace_enable(void)
 
        register_event_cmds();
 
+       register_trigger_cmds();
+
        return 0;
 }