1 // SPDX-License-Identifier: GPL-2.0
14  * enable_tracer_by_name - enable a tracer on the given instance
31 		return -1;  in enable_tracer_by_name()
38  * disable_tracer - set nop tracer to the insta
51  * create_instance - create a trace instance with *instance_name
59  * destroy_instance - remove a trace instance and free the data
68  * save_trace_to_file - save the trace output of the instance to the file
76 	int retval = -1;  in save_trace_to_file()
81 		return -1;  in save_trace_to_file()
109  * collect_registered_events - call the existing callback function for the event
119 	struct trace_seq *s = trace->seq;  in collect_registered_events()
121 	if (!event->handler)  in collect_registered_events()
124 	event->handler(s, record, event, context);  in collect_registered_events()
130  * trace_instance_destroy - destroy and free a rtla trace instance
134 	if (trace->inst) {  in trace_instance_destroy()
135 		disable_tracer(trace->inst);  in trace_instance_destroy()
136 		destroy_instance(trace->inst);  in trace_instance_destroy()
137 		trace->inst = NULL;  in trace_instance_destroy()
140 	if (trace->seq) {  in trace_instance_destroy()
141 		free(trace->seq);  in trace_instance_destroy()
142 		trace->seq = NULL;  in trace_instance_destroy()
145 	if (trace->tep) {  in trace_instance_destroy()
146 		tep_free(trace->tep);  in trace_instance_destroy()
147 		trace->tep = NULL;  in trace_instance_destroy()
152  * trace_instance_init - create an rtla trace instance
164 	trace->seq = calloc(1, sizeof(*trace->seq));  in trace_instance_init()
165 	if (!trace->seq)  in trace_instance_init()
168 	trace_seq_init(trace->seq);  in trace_instance_init()
170 	trace->inst = create_instance(tool_name);  in trace_instance_init()
171 	if (!trace->inst)  in trace_instance_init()
174 	trace->tep = tracefs_local_events(NULL);  in trace_instance_init()
175 	if (!trace->tep)  in trace_instance_init()
182 	tracefs_trace_off(trace->inst);  in trace_instance_init()
192  * trace_instance_start - start tracing a given rtla instance
196 	return tracefs_trace_on(trace->inst);  in trace_instance_start()
200  * trace_events_free - free a list of trace events
210 		tevent = tevent->next;  in trace_events_free()
212 		if (free_event->filter)  in trace_events_free()
213 			free(free_event->filter);  in trace_events_free()
214 		if (free_event->trigger)  in trace_events_free()
215 			free(free_event->trigger);  in trace_events_free()
216 		free(free_event->system);  in trace_events_free()
222  * trace_event_alloc - alloc and parse a single trace event
232 	tevent->system = strdup(event_string);  in trace_event_alloc()
233 	if (!tevent->system) {  in trace_event_alloc()
238 	tevent->event = strstr(tevent->system, ":");  in trace_event_alloc()
239 	if (tevent->event) {  in trace_event_alloc()
240 		*tevent->event = '\0';  in trace_event_alloc()
241 		tevent->event = &tevent->event[1];  in trace_event_alloc()
248  * trace_event_add_filter - record an event filter
252 	if (event->filter)  in trace_event_add_filter()
253 		free(event->filter);  in trace_event_add_filter()
255 	event->filter = strdup(filter);  in trace_event_add_filter()
256 	if (!event->filter)  in trace_event_add_filter()
263  * trace_event_add_trigger - record an event trigger action
265 int trace_event_add_trigger(struct trace_events *event, char *trigger)  in trace_event_add_trigger()  argument
267 	if (event->trigger)  in trace_event_add_trigger()
268 		free(event->trigger);  in trace_event_add_trigger()
270 	event->trigger = strdup(trigger);  in trace_event_add_trigger()
271 	if (!event->trigger)  in trace_event_add_trigger()
278  * trace_event_disable_filter - disable an event filter
286 	if (!tevent->filter)  in trace_event_disable_filter()
289 	if (!tevent->filter_enabled)  in trace_event_disable_filter()
292 	debug_msg("Disabling %s:%s filter %s\n", tevent->system,  in trace_event_disable_filter()
293 		  tevent->event ? : "*", tevent->filter);  in trace_event_disable_filter()
295 	snprintf(filter, 1024, "!%s\n", tevent->filter);  in trace_event_disable_filter()
297 	retval = tracefs_event_file_write(instance->inst, tevent->system,  in trace_event_disable_filter()
298 					  tevent->event, "filter", filter);  in trace_event_disable_filter()
300 		err_msg("Error disabling %s:%s filter %s\n", tevent->system,  in trace_event_disable_filter()
301 			tevent->event ? : "*", tevent->filter);  in trace_event_disable_filter()
305  * trace_event_save_hist - save the content of an event hist
307  * If the trigger is a hist: one, save the content of the hist file.
320 	/* trigger enables hist */  in trace_event_save_hist()
321 	if (!tevent->trigger)  in trace_event_save_hist()
324 	/* is this a hist: trigger? */  in trace_event_save_hist()
325 	retval = strncmp(tevent->trigger, "hist:", strlen("hist:"));  in trace_event_save_hist()
329 	snprintf(path, 1024, "%s_%s_hist.txt", tevent->system, tevent->event);  in trace_event_save_hist()
331 	printf("  Saving event %s:%s hist to %s\n", tevent->system, tevent->event, path);  in trace_event_save_hist()
339 	hist = tracefs_event_file_read(instance->inst, tevent->system, tevent->event, "hist", 0);  in trace_event_save_hist()
341 		err_msg("  Failed to read %s:%s hist file\n", tevent->system, tevent->event);  in trace_event_save_hist()
347 		index += write(out_fd, &hist[index], strlen(hist) - index);  in trace_event_save_hist()
356  * trace_event_disable_trigger - disable an event trigger
361 	char trigger[1024];  in trace_event_disable_trigger()  local
364 	if (!tevent->trigger)  in trace_event_disable_trigger()
367 	if (!tevent->trigger_enabled)  in trace_event_disable_trigger()
370 	debug_msg("Disabling %s:%s trigger %s\n", tevent->system,  in trace_event_disable_trigger()
371 		  tevent->event ? : "*", tevent->trigger);  in trace_event_disable_trigger()
375 	snprintf(trigger, 1024, "!%s\n", tevent->trigger);  in trace_event_disable_trigger()
377 	retval = tracefs_event_file_write(instance->inst, tevent->system,  in trace_event_disable_trigger()
378 					  tevent->event, "trigger", trigger);  in trace_event_disable_trigger()
380 		err_msg("Error disabling %s:%s trigger %s\n", tevent->system,  in trace_event_disable_trigger()
381 			tevent->event ? : "*", tevent->trigger);  in trace_event_disable_trigger()
385  * trace_events_disable - disable all trace events
396 		debug_msg("Disabling event %s:%s\n", tevent->system, tevent->event ? : "*");  in trace_events_disable()
397 		if (tevent->enabled) {  in trace_events_disable()
400 			tracefs_event_disable(instance->inst, tevent->system, tevent->event);  in trace_events_disable()
403 		tevent->enabled = 0;  in trace_events_disable()
404 		tevent = tevent->next;  in trace_events_disable()
409  * trace_event_enable_filter - enable an event filter associated with an event
417 	if (!tevent->filter)  in trace_event_enable_filter()
420 	if (!tevent->event) {  in trace_event_enable_filter()
421 		err_msg("Filter %s applies only for single events, not for all %s:* events\n",  in trace_event_enable_filter()
422 			tevent->filter, tevent->system);  in trace_event_enable_filter()
426 	snprintf(filter, 1024, "%s\n", tevent->filter);  in trace_event_enable_filter()
428 	debug_msg("Enabling %s:%s filter %s\n", tevent->system,  in trace_event_enable_filter()
429 		  tevent->event ? : "*", tevent->filter);  in trace_event_enable_filter()
431 	retval = tracefs_event_file_write(instance->inst, tevent->system,  in trace_event_enable_filter()
432 					  tevent->event, "filter", filter);  in trace_event_enable_filter()
434 		err_msg("Error enabling %s:%s filter %s\n", tevent->system,  in trace_event_enable_filter()
435 			tevent->event ? : "*", tevent->filter);  in trace_event_enable_filter()
439 	tevent->filter_enabled = 1;  in trace_event_enable_filter()
444  * trace_event_enable_trigger - enable an event trigger associated with an event
449 	char trigger[1024];  in trace_event_enable_trigger()  local
452 	if (!tevent->trigger)  in trace_event_enable_trigger()
455 	if (!tevent->event) {  in trace_event_enable_trigger()
456 		err_msg("Trigger %s applies only for single events, not for all %s:* events\n",  in trace_event_enable_trigger()
457 			tevent->trigger, tevent->system);  in trace_event_enable_trigger()
461 	snprintf(trigger, 1024, "%s\n", tevent->trigger);  in trace_event_enable_trigger()
463 	debug_msg("Enabling %s:%s trigger %s\n", tevent->system,  in trace_event_enable_trigger()
464 		  tevent->event ? : "*", tevent->trigger);  in trace_event_enable_trigger()
466 	retval = tracefs_event_file_write(instance->inst, tevent->system,  in trace_event_enable_trigger()
467 					  tevent->event, "trigger", trigger);  in trace_event_enable_trigger()
469 		err_msg("Error enabling %s:%s trigger %s\n", tevent->system,  in trace_event_enable_trigger()
470 			tevent->event ? : "*", tevent->trigger);  in trace_event_enable_trigger()
474 	tevent->trigger_enabled = 1;  in trace_event_enable_trigger()
480  * trace_events_enable - enable all events
489 		debug_msg("Enabling event %s:%s\n", tevent->system, tevent->event ? : "*");  in trace_events_enable()
490 		retval = tracefs_event_enable(instance->inst, tevent->system, tevent->event);  in trace_events_enable()
492 			err_msg("Error enabling event %s:%s\n", tevent->system,  in trace_events_enable()
493 				tevent->event ? : "*");  in trace_events_enable()
505 		tevent->enabled = 1;  in trace_events_enable()
506 		tevent = tevent->next;  in trace_events_enable()
513  * trace_events_destroy - disable and free all trace events
531 	if (!tracefs_trace_is_on(tool->inst))  in trace_is_off()
535 	 * The trace instance is only enabled when -t is set. IOW, when the system  in trace_is_off()
538 	if (trace && !tracefs_trace_is_on(trace->inst))  in trace_is_off()