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()
84 		return -1;  in save_trace_to_file()
113  * collect_registered_events - call the existing callback function for the event
123 	struct trace_seq *s = trace->seq;  in collect_registered_events()
125 	trace->processed_events++;  in collect_registered_events()
127 	if (!event->handler)  in collect_registered_events()
130 	event->handler(s, record, event, context);  in collect_registered_events()
136  * collect_missed_events - record number of missed events
148 	if (trace->missed_events == UINT64_MAX)  in collect_missed_events()
151 	if (record->missed_events > 0)  in collect_missed_events()
152 		trace->missed_events += record->missed_events;  in collect_missed_events()
155 		trace->missed_events = UINT64_MAX;  in collect_missed_events()
161  * trace_instance_destroy - destroy and free a rtla trace instance
165 	if (trace->inst) {  in trace_instance_destroy()
166 		disable_tracer(trace->inst);  in trace_instance_destroy()
167 		destroy_instance(trace->inst);  in trace_instance_destroy()
168 		trace->inst = NULL;  in trace_instance_destroy()
171 	if (trace->seq) {  in trace_instance_destroy()
172 		free(trace->seq);  in trace_instance_destroy()
173 		trace->seq = NULL;  in trace_instance_destroy()
176 	if (trace->tep) {  in trace_instance_destroy()
177 		tep_free(trace->tep);  in trace_instance_destroy()
178 		trace->tep = NULL;  in trace_instance_destroy()
183  * trace_instance_init - create an rtla trace instance
195 	trace->seq = calloc(1, sizeof(*trace->seq));  in trace_instance_init()
196 	if (!trace->seq)  in trace_instance_init()
199 	trace_seq_init(trace->seq);  in trace_instance_init()
201 	trace->inst = create_instance(tool_name);  in trace_instance_init()
202 	if (!trace->inst)  in trace_instance_init()
205 	trace->tep = tracefs_local_events(NULL);  in trace_instance_init()
206 	if (!trace->tep)  in trace_instance_init()
213 	tracefs_trace_off(trace->inst);  in trace_instance_init()
219 	trace->missed_events = 0;  in trace_instance_init()
220 	tracefs_follow_missed_events(trace->inst,  in trace_instance_init()
224 	trace->processed_events = 0;  in trace_instance_init()
234  * trace_instance_start - start tracing a given rtla instance
238 	return tracefs_trace_on(trace->inst);  in trace_instance_start()
242  * trace_instance_stop - stop tracing a given rtla instance
246 	return tracefs_trace_off(trace->inst);  in trace_instance_stop()
250  * trace_events_free - free a list of trace events
260 		tevent = tevent->next;  in trace_events_free()
262 		if (free_event->filter)  in trace_events_free()
263 			free(free_event->filter);  in trace_events_free()
264 		if (free_event->trigger)  in trace_events_free()
265 			free(free_event->trigger);  in trace_events_free()
266 		free(free_event->system);  in trace_events_free()
272  * trace_event_alloc - alloc and parse a single trace event
282 	tevent->system = strdup(event_string);  in trace_event_alloc()
283 	if (!tevent->system) {  in trace_event_alloc()
288 	tevent->event = strstr(tevent->system, ":");  in trace_event_alloc()
289 	if (tevent->event) {  in trace_event_alloc()
290 		*tevent->event = '\0';  in trace_event_alloc()
291 		tevent->event = &tevent->event[1];  in trace_event_alloc()
298  * trace_event_add_filter - record an event filter
302 	if (event->filter)  in trace_event_add_filter()
303 		free(event->filter);  in trace_event_add_filter()
305 	event->filter = strdup(filter);  in trace_event_add_filter()
306 	if (!event->filter)  in trace_event_add_filter()
313  * trace_event_add_trigger - record an event trigger action
315 int trace_event_add_trigger(struct trace_events *event, char *trigger)  in trace_event_add_trigger()  argument
317 	if (event->trigger)  in trace_event_add_trigger()
318 		free(event->trigger);  in trace_event_add_trigger()
320 	event->trigger = strdup(trigger);  in trace_event_add_trigger()
321 	if (!event->trigger)  in trace_event_add_trigger()
328  * trace_event_disable_filter - disable an event filter
336 	if (!tevent->filter)  in trace_event_disable_filter()
339 	if (!tevent->filter_enabled)  in trace_event_disable_filter()
342 	debug_msg("Disabling %s:%s filter %s\n", tevent->system,  in trace_event_disable_filter()
343 		  tevent->event ? : "*", tevent->filter);  in trace_event_disable_filter()
345 	snprintf(filter, 1024, "!%s\n", tevent->filter);  in trace_event_disable_filter()
347 	retval = tracefs_event_file_write(instance->inst, tevent->system,  in trace_event_disable_filter()
348 					  tevent->event, "filter", filter);  in trace_event_disable_filter()
350 		err_msg("Error disabling %s:%s filter %s\n", tevent->system,  in trace_event_disable_filter()
351 			tevent->event ? : "*", tevent->filter);  in trace_event_disable_filter()
355  * trace_event_save_hist - save the content of an event hist
357  * If the trigger is a hist: one, save the content of the hist file.
370 	/* trigger enables hist */  in trace_event_save_hist()
371 	if (!tevent->trigger)  in trace_event_save_hist()
374 	/* is this a hist: trigger? */  in trace_event_save_hist()
375 	retval = strncmp(tevent->trigger, "hist:", strlen("hist:"));  in trace_event_save_hist()
379 	snprintf(path, 1024, "%s_%s_hist.txt", tevent->system, tevent->event);  in trace_event_save_hist()
381 	printf("  Saving event %s:%s hist to %s\n", tevent->system, tevent->event, path);  in trace_event_save_hist()
389 	hist = tracefs_event_file_read(instance->inst, tevent->system, tevent->event, "hist", 0);  in trace_event_save_hist()
391 		err_msg("  Failed to read %s:%s hist file\n", tevent->system, tevent->event);  in trace_event_save_hist()
397 		index += write(out_fd, &hist[index], strlen(hist) - index);  in trace_event_save_hist()
406  * trace_event_disable_trigger - disable an event trigger
411 	char trigger[1024];  in trace_event_disable_trigger()  local
414 	if (!tevent->trigger)  in trace_event_disable_trigger()
417 	if (!tevent->trigger_enabled)  in trace_event_disable_trigger()
420 	debug_msg("Disabling %s:%s trigger %s\n", tevent->system,  in trace_event_disable_trigger()
421 		  tevent->event ? : "*", tevent->trigger);  in trace_event_disable_trigger()
425 	snprintf(trigger, 1024, "!%s\n", tevent->trigger);  in trace_event_disable_trigger()
427 	retval = tracefs_event_file_write(instance->inst, tevent->system,  in trace_event_disable_trigger()
428 					  tevent->event, "trigger", trigger);  in trace_event_disable_trigger()
430 		err_msg("Error disabling %s:%s trigger %s\n", tevent->system,  in trace_event_disable_trigger()
431 			tevent->event ? : "*", tevent->trigger);  in trace_event_disable_trigger()
435  * trace_events_disable - disable all trace events
446 		debug_msg("Disabling event %s:%s\n", tevent->system, tevent->event ? : "*");  in trace_events_disable()
447 		if (tevent->enabled) {  in trace_events_disable()
450 			tracefs_event_disable(instance->inst, tevent->system, tevent->event);  in trace_events_disable()
453 		tevent->enabled = 0;  in trace_events_disable()
454 		tevent = tevent->next;  in trace_events_disable()
459  * trace_event_enable_filter - enable an event filter associated with an event
467 	if (!tevent->filter)  in trace_event_enable_filter()
470 	if (!tevent->event) {  in trace_event_enable_filter()
471 		err_msg("Filter %s applies only for single events, not for all %s:* events\n",  in trace_event_enable_filter()
472 			tevent->filter, tevent->system);  in trace_event_enable_filter()
476 	snprintf(filter, 1024, "%s\n", tevent->filter);  in trace_event_enable_filter()
478 	debug_msg("Enabling %s:%s filter %s\n", tevent->system,  in trace_event_enable_filter()
479 		  tevent->event ? : "*", tevent->filter);  in trace_event_enable_filter()
481 	retval = tracefs_event_file_write(instance->inst, tevent->system,  in trace_event_enable_filter()
482 					  tevent->event, "filter", filter);  in trace_event_enable_filter()
484 		err_msg("Error enabling %s:%s filter %s\n", tevent->system,  in trace_event_enable_filter()
485 			tevent->event ? : "*", tevent->filter);  in trace_event_enable_filter()
489 	tevent->filter_enabled = 1;  in trace_event_enable_filter()
494  * trace_event_enable_trigger - enable an event trigger associated with an event
499 	char trigger[1024];  in trace_event_enable_trigger()  local
502 	if (!tevent->trigger)  in trace_event_enable_trigger()
505 	if (!tevent->event) {  in trace_event_enable_trigger()
506 		err_msg("Trigger %s applies only for single events, not for all %s:* events\n",  in trace_event_enable_trigger()
507 			tevent->trigger, tevent->system);  in trace_event_enable_trigger()
511 	snprintf(trigger, 1024, "%s\n", tevent->trigger);  in trace_event_enable_trigger()
513 	debug_msg("Enabling %s:%s trigger %s\n", tevent->system,  in trace_event_enable_trigger()
514 		  tevent->event ? : "*", tevent->trigger);  in trace_event_enable_trigger()
516 	retval = tracefs_event_file_write(instance->inst, tevent->system,  in trace_event_enable_trigger()
517 					  tevent->event, "trigger", trigger);  in trace_event_enable_trigger()
519 		err_msg("Error enabling %s:%s trigger %s\n", tevent->system,  in trace_event_enable_trigger()
520 			tevent->event ? : "*", tevent->trigger);  in trace_event_enable_trigger()
524 	tevent->trigger_enabled = 1;  in trace_event_enable_trigger()
530  * trace_events_enable - enable all events
539 		debug_msg("Enabling event %s:%s\n", tevent->system, tevent->event ? : "*");  in trace_events_enable()
540 		retval = tracefs_event_enable(instance->inst, tevent->system, tevent->event);  in trace_events_enable()
542 			err_msg("Error enabling event %s:%s\n", tevent->system,  in trace_events_enable()
543 				tevent->event ? : "*");  in trace_events_enable()
555 		tevent->enabled = 1;  in trace_events_enable()
556 		tevent = tevent->next;  in trace_events_enable()
563  * trace_events_destroy - disable and free all trace events
576  * trace_set_buffer_size - set the per-cpu tracing buffer size.
583 	retval = tracefs_instance_set_buffer_size(trace->inst, size, -1);  in trace_set_buffer_size()