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 	trace->processed_events++;  in collect_registered_events()
123 	if (!event->handler)  in collect_registered_events()
126 	event->handler(s, record, event, context);  in collect_registered_events()
132  * collect_missed_events - record number of missed events
144 	if (trace->missed_events == UINT64_MAX)  in collect_missed_events()
147 	if (record->missed_events > 0)  in collect_missed_events()
148 		trace->missed_events += record->missed_events;  in collect_missed_events()
151 		trace->missed_events = UINT64_MAX;  in collect_missed_events()
157  * trace_instance_destroy - destroy and free a rtla trace instance
161 	if (trace->inst) {  in trace_instance_destroy()
162 		disable_tracer(trace->inst);  in trace_instance_destroy()
163 		destroy_instance(trace->inst);  in trace_instance_destroy()
164 		trace->inst = NULL;  in trace_instance_destroy()
167 	if (trace->seq) {  in trace_instance_destroy()
168 		free(trace->seq);  in trace_instance_destroy()
169 		trace->seq = NULL;  in trace_instance_destroy()
172 	if (trace->tep) {  in trace_instance_destroy()
173 		tep_free(trace->tep);  in trace_instance_destroy()
174 		trace->tep = NULL;  in trace_instance_destroy()
179  * trace_instance_init - create an rtla trace instance
191 	trace->seq = calloc(1, sizeof(*trace->seq));  in trace_instance_init()
192 	if (!trace->seq)  in trace_instance_init()
195 	trace_seq_init(trace->seq);  in trace_instance_init()
197 	trace->inst = create_instance(tool_name);  in trace_instance_init()
198 	if (!trace->inst)  in trace_instance_init()
201 	trace->tep = tracefs_local_events(NULL);  in trace_instance_init()
202 	if (!trace->tep)  in trace_instance_init()
209 	tracefs_trace_off(trace->inst);  in trace_instance_init()
215 	trace->missed_events = 0;  in trace_instance_init()
216 	tracefs_follow_missed_events(trace->inst,  in trace_instance_init()
220 	trace->processed_events = 0;  in trace_instance_init()
230  * trace_instance_start - start tracing a given rtla instance
234 	return tracefs_trace_on(trace->inst);  in trace_instance_start()
238  * trace_instance_stop - stop tracing a given rtla instance
242 	return tracefs_trace_off(trace->inst);  in trace_instance_stop()
246  * trace_events_free - free a list of trace events
256 		tevent = tevent->next;  in trace_events_free()
258 		if (free_event->filter)  in trace_events_free()
259 			free(free_event->filter);  in trace_events_free()
260 		if (free_event->trigger)  in trace_events_free()
261 			free(free_event->trigger);  in trace_events_free()
262 		free(free_event->system);  in trace_events_free()
268  * trace_event_alloc - alloc and parse a single trace event
278 	tevent->system = strdup(event_string);  in trace_event_alloc()
279 	if (!tevent->system) {  in trace_event_alloc()
284 	tevent->event = strstr(tevent->system, ":");  in trace_event_alloc()
285 	if (tevent->event) {  in trace_event_alloc()
286 		*tevent->event = '\0';  in trace_event_alloc()
287 		tevent->event = &tevent->event[1];  in trace_event_alloc()
294  * trace_event_add_filter - record an event filter
298 	if (event->filter)  in trace_event_add_filter()
299 		free(event->filter);  in trace_event_add_filter()
301 	event->filter = strdup(filter);  in trace_event_add_filter()
302 	if (!event->filter)  in trace_event_add_filter()
309  * trace_event_add_trigger - record an event trigger action
311 int trace_event_add_trigger(struct trace_events *event, char *trigger)  in trace_event_add_trigger()  argument
313 	if (event->trigger)  in trace_event_add_trigger()
314 		free(event->trigger);  in trace_event_add_trigger()
316 	event->trigger = strdup(trigger);  in trace_event_add_trigger()
317 	if (!event->trigger)  in trace_event_add_trigger()
324  * trace_event_disable_filter - disable an event filter
332 	if (!tevent->filter)  in trace_event_disable_filter()
335 	if (!tevent->filter_enabled)  in trace_event_disable_filter()
338 	debug_msg("Disabling %s:%s filter %s\n", tevent->system,  in trace_event_disable_filter()
339 		  tevent->event ? : "*", tevent->filter);  in trace_event_disable_filter()
341 	snprintf(filter, 1024, "!%s\n", tevent->filter);  in trace_event_disable_filter()
343 	retval = tracefs_event_file_write(instance->inst, tevent->system,  in trace_event_disable_filter()
344 					  tevent->event, "filter", filter);  in trace_event_disable_filter()
346 		err_msg("Error disabling %s:%s filter %s\n", tevent->system,  in trace_event_disable_filter()
347 			tevent->event ? : "*", tevent->filter);  in trace_event_disable_filter()
351  * trace_event_save_hist - save the content of an event hist
353  * If the trigger is a hist: one, save the content of the hist file.
366 	/* trigger enables hist */  in trace_event_save_hist()
367 	if (!tevent->trigger)  in trace_event_save_hist()
370 	/* is this a hist: trigger? */  in trace_event_save_hist()
371 	retval = strncmp(tevent->trigger, "hist:", strlen("hist:"));  in trace_event_save_hist()
375 	snprintf(path, 1024, "%s_%s_hist.txt", tevent->system, tevent->event);  in trace_event_save_hist()
377 	printf("  Saving event %s:%s hist to %s\n", tevent->system, tevent->event, path);  in trace_event_save_hist()
385 	hist = tracefs_event_file_read(instance->inst, tevent->system, tevent->event, "hist", 0);  in trace_event_save_hist()
387 		err_msg("  Failed to read %s:%s hist file\n", tevent->system, tevent->event);  in trace_event_save_hist()
393 		index += write(out_fd, &hist[index], strlen(hist) - index);  in trace_event_save_hist()
402  * trace_event_disable_trigger - disable an event trigger
407 	char trigger[1024];  in trace_event_disable_trigger()  local
410 	if (!tevent->trigger)  in trace_event_disable_trigger()
413 	if (!tevent->trigger_enabled)  in trace_event_disable_trigger()
416 	debug_msg("Disabling %s:%s trigger %s\n", tevent->system,  in trace_event_disable_trigger()
417 		  tevent->event ? : "*", tevent->trigger);  in trace_event_disable_trigger()
421 	snprintf(trigger, 1024, "!%s\n", tevent->trigger);  in trace_event_disable_trigger()
423 	retval = tracefs_event_file_write(instance->inst, tevent->system,  in trace_event_disable_trigger()
424 					  tevent->event, "trigger", trigger);  in trace_event_disable_trigger()
426 		err_msg("Error disabling %s:%s trigger %s\n", tevent->system,  in trace_event_disable_trigger()
427 			tevent->event ? : "*", tevent->trigger);  in trace_event_disable_trigger()
431  * trace_events_disable - disable all trace events
442 		debug_msg("Disabling event %s:%s\n", tevent->system, tevent->event ? : "*");  in trace_events_disable()
443 		if (tevent->enabled) {  in trace_events_disable()
446 			tracefs_event_disable(instance->inst, tevent->system, tevent->event);  in trace_events_disable()
449 		tevent->enabled = 0;  in trace_events_disable()
450 		tevent = tevent->next;  in trace_events_disable()
455  * trace_event_enable_filter - enable an event filter associated with an event
463 	if (!tevent->filter)  in trace_event_enable_filter()
466 	if (!tevent->event) {  in trace_event_enable_filter()
467 		err_msg("Filter %s applies only for single events, not for all %s:* events\n",  in trace_event_enable_filter()
468 			tevent->filter, tevent->system);  in trace_event_enable_filter()
472 	snprintf(filter, 1024, "%s\n", tevent->filter);  in trace_event_enable_filter()
474 	debug_msg("Enabling %s:%s filter %s\n", tevent->system,  in trace_event_enable_filter()
475 		  tevent->event ? : "*", tevent->filter);  in trace_event_enable_filter()
477 	retval = tracefs_event_file_write(instance->inst, tevent->system,  in trace_event_enable_filter()
478 					  tevent->event, "filter", filter);  in trace_event_enable_filter()
480 		err_msg("Error enabling %s:%s filter %s\n", tevent->system,  in trace_event_enable_filter()
481 			tevent->event ? : "*", tevent->filter);  in trace_event_enable_filter()
485 	tevent->filter_enabled = 1;  in trace_event_enable_filter()
490  * trace_event_enable_trigger - enable an event trigger associated with an event
495 	char trigger[1024];  in trace_event_enable_trigger()  local
498 	if (!tevent->trigger)  in trace_event_enable_trigger()
501 	if (!tevent->event) {  in trace_event_enable_trigger()
502 		err_msg("Trigger %s applies only for single events, not for all %s:* events\n",  in trace_event_enable_trigger()
503 			tevent->trigger, tevent->system);  in trace_event_enable_trigger()
507 	snprintf(trigger, 1024, "%s\n", tevent->trigger);  in trace_event_enable_trigger()
509 	debug_msg("Enabling %s:%s trigger %s\n", tevent->system,  in trace_event_enable_trigger()
510 		  tevent->event ? : "*", tevent->trigger);  in trace_event_enable_trigger()
512 	retval = tracefs_event_file_write(instance->inst, tevent->system,  in trace_event_enable_trigger()
513 					  tevent->event, "trigger", trigger);  in trace_event_enable_trigger()
515 		err_msg("Error enabling %s:%s trigger %s\n", tevent->system,  in trace_event_enable_trigger()
516 			tevent->event ? : "*", tevent->trigger);  in trace_event_enable_trigger()
520 	tevent->trigger_enabled = 1;  in trace_event_enable_trigger()
526  * trace_events_enable - enable all events
535 		debug_msg("Enabling event %s:%s\n", tevent->system, tevent->event ? : "*");  in trace_events_enable()
536 		retval = tracefs_event_enable(instance->inst, tevent->system, tevent->event);  in trace_events_enable()
538 			err_msg("Error enabling event %s:%s\n", tevent->system,  in trace_events_enable()
539 				tevent->event ? : "*");  in trace_events_enable()
551 		tevent->enabled = 1;  in trace_events_enable()
552 		tevent = tevent->next;  in trace_events_enable()
559  * trace_events_destroy - disable and free all trace events
572  * trace_set_buffer_size - set the per-cpu tracing buffer size.
579 	retval = tracefs_instance_set_buffer_size(trace->inst, size, -1);  in trace_set_buffer_size()