Add a set of helper functions to allow rtla tools to filter events
in the trace instance.
Cc: Daniel Bristot de Oliveira <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Signed-off-by: Daniel Bristot de Oliveira <[email protected]>
---
tools/tracing/rtla/src/trace.c | 83 ++++++++++++++++++++++++++++++++++
tools/tracing/rtla/src/trace.h | 3 ++
2 files changed, 86 insertions(+)
diff --git a/tools/tracing/rtla/src/trace.c b/tools/tracing/rtla/src/trace.c
index 7f8661b2724d..ef44bab0c404 100644
--- a/tools/tracing/rtla/src/trace.c
+++ b/tools/tracing/rtla/src/trace.c
@@ -204,6 +204,8 @@ static void trace_events_free(struct trace_events *events)
tevent = tevent->next;
+ if (free_event->filter)
+ free(free_event->filter);
if (free_event->trigger)
free(free_event->trigger);
free(free_event->system);
@@ -237,6 +239,21 @@ struct trace_events *trace_event_alloc(const char *event_string)
return tevent;
}
+/*
+ * trace_event_add_filter - record an event filter
+ */
+int trace_event_add_filter(struct trace_events *event, char *filter)
+{
+ if (event->filter)
+ free(event->filter);
+
+ event->filter = strdup(filter);
+ if (!event->filter)
+ return 1;
+
+ return 0;
+}
+
/*
* trace_event_add_trigger - record an event trigger action
*/
@@ -252,6 +269,33 @@ int trace_event_add_trigger(struct trace_events *event, char *trigger)
return 0;
}
+/*
+ * trace_event_disable_filter - disable an event filter
+ */
+static void trace_event_disable_filter(struct trace_instance *instance,
+ struct trace_events *tevent)
+{
+ char filter[1024];
+ int retval;
+
+ if (!tevent->filter)
+ return;
+
+ if (!tevent->filter_enabled)
+ return;
+
+ debug_msg("Disabling %s:%s filter %s\n", tevent->system,
+ tevent->event ? : "*", tevent->filter);
+
+ snprintf(filter, 1024, "!%s\n", tevent->filter);
+
+ retval = tracefs_event_file_write(instance->inst, tevent->system,
+ tevent->event, "filter", filter);
+ if (retval < 0)
+ err_msg("Error disabling %s:%s filter %s\n", tevent->system,
+ tevent->event ? : "*", tevent->filter);
+}
+
/*
* trace_event_disable_trigger - disable an event trigger
*/
@@ -293,6 +337,7 @@ void trace_events_disable(struct trace_instance *instance,
while (tevent) {
debug_msg("Disabling event %s:%s\n", tevent->system, tevent->event ? : "*");
if (tevent->enabled) {
+ trace_event_disable_filter(instance, tevent);
trace_event_disable_trigger(instance, tevent);
tracefs_event_disable(instance->inst, tevent->system, tevent->event);
}
@@ -302,6 +347,41 @@ void trace_events_disable(struct trace_instance *instance,
}
}
+/*
+ * trace_event_enable_filter - enable an event filter associated with an event
+ */
+static int trace_event_enable_filter(struct trace_instance *instance,
+ struct trace_events *tevent)
+{
+ char filter[1024];
+ int retval;
+
+ if (!tevent->filter)
+ return 0;
+
+ if (!tevent->event) {
+ err_msg("Filter %s applies only for single events, not for all %s:* events\n",
+ tevent->filter, tevent->system);
+ return 1;
+ }
+
+ snprintf(filter, 1024, "%s\n", tevent->filter);
+
+ debug_msg("Enabling %s:%s filter %s\n", tevent->system,
+ tevent->event ? : "*", tevent->filter);
+
+ retval = tracefs_event_file_write(instance->inst, tevent->system,
+ tevent->event, "filter", filter);
+ if (retval < 0) {
+ err_msg("Error enabling %s:%s filter %s\n", tevent->system,
+ tevent->event ? : "*", tevent->filter);
+ return 1;
+ }
+
+ tevent->filter_enabled = 1;
+ return 0;
+}
+
/*
* trace_event_enable_trigger - enable an event trigger associated with an event
*/
@@ -356,6 +436,9 @@ int trace_events_enable(struct trace_instance *instance,
return 1;
}
+ retval = trace_event_enable_filter(instance, tevent);
+ if (retval)
+ return 1;
retval = trace_event_enable_trigger(instance, tevent);
if (retval)
diff --git a/tools/tracing/rtla/src/trace.h b/tools/tracing/rtla/src/trace.h
index 856b26d93064..51ad344c600b 100644
--- a/tools/tracing/rtla/src/trace.h
+++ b/tools/tracing/rtla/src/trace.h
@@ -6,8 +6,10 @@ struct trace_events {
struct trace_events *next;
char *system;
char *event;
+ char *filter;
char *trigger;
char enabled;
+ char filter_enabled;
char trigger_enabled;
};
@@ -43,4 +45,5 @@ void trace_events_destroy(struct trace_instance *instance,
int trace_events_enable(struct trace_instance *instance,
struct trace_events *events);
+int trace_event_add_filter(struct trace_events *event, char *filter);
int trace_event_add_trigger(struct trace_events *event, char *trigger);
--
2.34.1