Merge tag 'trace-v5.15' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...

[linux-2.6-microblaze.git] / include / linux / trace_events.h

diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index 8e0631a..3e475ee 100644 (file)
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -310,8 +310,10 @@ enum {
        TRACE_EVENT_FL_NO_SET_FILTER_BIT,
        TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
        TRACE_EVENT_FL_TRACEPOINT_BIT,
+       TRACE_EVENT_FL_DYNAMIC_BIT,
        TRACE_EVENT_FL_KPROBE_BIT,
        TRACE_EVENT_FL_UPROBE_BIT,
+       TRACE_EVENT_FL_EPROBE_BIT,
 };
 
 /*
@@ -321,8 +323,10 @@ enum {
  *  NO_SET_FILTER - Set when filter has error and is to be ignored
  *  IGNORE_ENABLE - For trace internal events, do not enable with debugfs file
  *  TRACEPOINT    - Event is a tracepoint
+ *  DYNAMIC       - Event is a dynamic event (created at run time)
  *  KPROBE        - Event is a kprobe
  *  UPROBE        - Event is a uprobe
+ *  EPROBE        - Event is an event probe
  */
 enum {
        TRACE_EVENT_FL_FILTERED         = (1 << TRACE_EVENT_FL_FILTERED_BIT),
@@ -330,8 +334,10 @@ enum {
        TRACE_EVENT_FL_NO_SET_FILTER    = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
        TRACE_EVENT_FL_IGNORE_ENABLE    = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
        TRACE_EVENT_FL_TRACEPOINT       = (1 << TRACE_EVENT_FL_TRACEPOINT_BIT),
+       TRACE_EVENT_FL_DYNAMIC          = (1 << TRACE_EVENT_FL_DYNAMIC_BIT),
        TRACE_EVENT_FL_KPROBE           = (1 << TRACE_EVENT_FL_KPROBE_BIT),
        TRACE_EVENT_FL_UPROBE           = (1 << TRACE_EVENT_FL_UPROBE_BIT),
+       TRACE_EVENT_FL_EPROBE           = (1 << TRACE_EVENT_FL_EPROBE_BIT),
 };
 
 #define TRACE_EVENT_FL_UKPROBE (TRACE_EVENT_FL_KPROBE | TRACE_EVENT_FL_UPROBE)
@@ -347,7 +353,14 @@ struct trace_event_call {
        struct trace_event      event;
        char                    *print_fmt;
        struct event_filter     *filter;
-       void                    *mod;
+       /*
+        * Static events can disappear with modules,
+        * where as dynamic ones need their own ref count.
+        */
+       union {
+               void                            *module;
+               atomic_t                        refcnt;
+       };
        void                    *data;
 
        /* See the TRACE_EVENT_FL_* flags above */
@@ -363,6 +376,42 @@ struct trace_event_call {
 #endif
 };
 
+#ifdef CONFIG_DYNAMIC_EVENTS
+bool trace_event_dyn_try_get_ref(struct trace_event_call *call);
+void trace_event_dyn_put_ref(struct trace_event_call *call);
+bool trace_event_dyn_busy(struct trace_event_call *call);
+#else
+static inline bool trace_event_dyn_try_get_ref(struct trace_event_call *call)
+{
+       /* Without DYNAMIC_EVENTS configured, nothing should be calling this */
+       return false;
+}
+static inline void trace_event_dyn_put_ref(struct trace_event_call *call)
+{
+}
+static inline bool trace_event_dyn_busy(struct trace_event_call *call)
+{
+       /* Nothing should call this without DYNAIMIC_EVENTS configured. */
+       return true;
+}
+#endif
+
+static inline bool trace_event_try_get_ref(struct trace_event_call *call)
+{
+       if (call->flags & TRACE_EVENT_FL_DYNAMIC)
+               return trace_event_dyn_try_get_ref(call);
+       else
+               return try_module_get(call->module);
+}
+
+static inline void trace_event_put_ref(struct trace_event_call *call)
+{
+       if (call->flags & TRACE_EVENT_FL_DYNAMIC)
+               trace_event_dyn_put_ref(call);
+       else
+               module_put(call->module);
+}
+
 #ifdef CONFIG_PERF_EVENTS
 static inline bool bpf_prog_array_valid(struct trace_event_call *call)
 {
@@ -634,6 +683,7 @@ enum event_trigger_type {
        ETT_EVENT_ENABLE        = (1 << 3),
        ETT_EVENT_HIST          = (1 << 4),
        ETT_HIST_ENABLE         = (1 << 5),
+       ETT_EVENT_EPROBE        = (1 << 6),
 };
 
 extern int filter_match_preds(struct event_filter *filter, void *rec);