@@ -204,6 +204,8 @@ static void trace_events_free(struct trace_events *events)
tevent = tevent->next;
+ if (free_event->trigger)
+ free(free_event->trigger);
free(free_event->system);
free(free_event);
}
@@ -235,6 +237,48 @@ struct trace_events *trace_event_alloc(const char *event_string)
return tevent;
}
+/*
+ * trace_event_add_trigger - record an event trigger action
+ */
+int trace_event_add_trigger(struct trace_events *event, char *trigger)
+{
+ if (event->trigger)
+ free(event->trigger);
+
+ event->trigger = strdup(trigger);
+ if (!event->trigger)
+ return 1;
+
+ return 0;
+}
+
+/*
+ * trace_event_disable_trigger - disable an event trigger
+ */
+static void trace_event_disable_trigger(struct trace_instance *instance,
+ struct trace_events *tevent)
+{
+ char trigger[1024];
+ int retval;
+
+ if (!tevent->trigger)
+ return;
+
+ if (!tevent->trigger_enabled)
+ return;
+
+ debug_msg("Disabling %s:%s trigger %s\n", tevent->system,
+ tevent->event ? : "*", tevent->trigger);
+
+ snprintf(trigger, 1024, "!%s\n", tevent->trigger);
+
+ retval = tracefs_event_file_write(instance->inst, tevent->system,
+ tevent->event, "trigger", trigger);
+ if (retval < 0)
+ err_msg("Error disabling %s:%s trigger %s\n", tevent->system,
+ tevent->event ? : "*", tevent->trigger);
+}
+
/*
* trace_events_disable - disable all trace events
*/
@@ -248,14 +292,52 @@ void trace_events_disable(struct trace_instance *instance,
while (tevent) {
debug_msg("Disabling event %s:%s\n", tevent->system, tevent->event ? : "*");
- if (tevent->enabled)
+ if (tevent->enabled) {
+ trace_event_disable_trigger(instance, tevent);
tracefs_event_disable(instance->inst, tevent->system, tevent->event);
+ }
tevent->enabled = 0;
tevent = tevent->next;
}
}
+/*
+ * trace_event_enable_trigger - enable an event trigger associated with an event
+ */
+static int trace_event_enable_trigger(struct trace_instance *instance,
+ struct trace_events *tevent)
+{
+ char trigger[1024];
+ int retval;
+
+ if (!tevent->trigger)
+ return 0;
+
+ if (!tevent->event) {
+ err_msg("Trigger %s applies only for single events, not for all %s:* events\n",
+ tevent->trigger, tevent->system);
+ return 1;
+ }
+
+ snprintf(trigger, 1024, "%s\n", tevent->trigger);
+
+ debug_msg("Enabling %s:%s trigger %s\n", tevent->system,
+ tevent->event ? : "*", tevent->trigger);
+
+ retval = tracefs_event_file_write(instance->inst, tevent->system,
+ tevent->event, "trigger", trigger);
+ if (retval < 0) {
+ err_msg("Error enabling %s:%s trigger %s\n", tevent->system,
+ tevent->event ? : "*", tevent->trigger);
+ return 1;
+ }
+
+ tevent->trigger_enabled = 1;
+
+ return 0;
+}
+
/*
* trace_events_enable - enable all events
*/
@@ -275,6 +357,10 @@ int trace_events_enable(struct trace_instance *instance,
}
+ retval = trace_event_enable_trigger(instance, tevent);
+ if (retval)
+ return 1;
+
tevent->enabled = 1;
tevent = tevent->next;
}
@@ -6,7 +6,9 @@ struct trace_events {
struct trace_events *next;
char *system;
char *event;
+ char *trigger;
char enabled;
+ char trigger_enabled;
};
struct trace_instance {
@@ -40,3 +42,5 @@ void trace_events_destroy(struct trace_instance *instance,
struct trace_events *events);
int trace_events_enable(struct trace_instance *instance,
struct trace_events *events);
+
+int trace_event_add_trigger(struct trace_events *event, char *trigger);
Add a set of helper functions to allow rtla tools to trigger event actions in the trace instance. Cc: Daniel Bristot de Oliveira <bristot@kernel.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Daniel Bristot de Oliveira <bristot@kernel.org> --- tools/tracing/rtla/src/trace.c | 88 +++++++++++++++++++++++++++++++++- tools/tracing/rtla/src/trace.h | 4 ++ 2 files changed, 91 insertions(+), 1 deletion(-)