1 // SPDX-License-Identifier: GPL-2.0
23 static int dma_latency_fd = -1;
26  * timerlat_apply_config - apply common configs to the initialized tool
35 	 * If BPF enablement fails, fall back to tracefs mode.  in timerlat_apply_config()
39 		params->mode = TRACING_MODE_TRACEFS;  in timerlat_apply_config()
40 	} else if (!tep_find_event_by_name(tool->trace.tep, "osnoise", "timerlat_sample")) {  in timerlat_apply_config()
42 		params->mode = TRACING_MODE_TRACEFS;  in timerlat_apply_config()
47 			params->mode = TRACING_MODE_TRACEFS;  in timerlat_apply_config()
51 	if (params->mode != TRACING_MODE_BPF) {  in timerlat_apply_config()
53 		 * In tracefs and mixed mode, timerlat tracer handles stopping  in timerlat_apply_config()
56 		retval = osnoise_set_stop_us(tool->context, params->common.stop_us);  in timerlat_apply_config()
58 			err_msg("Failed to set stop us\n");  in timerlat_apply_config()
62 		retval = osnoise_set_stop_total_us(tool->context, params->common.stop_total_us);  in timerlat_apply_config()
64 			err_msg("Failed to set stop total us\n");  in timerlat_apply_config()
70 	retval = osnoise_set_timerlat_period_us(tool->context,  in timerlat_apply_config()
71 						params->timerlat_period_us ?  in timerlat_apply_config()
72 						params->timerlat_period_us :  in timerlat_apply_config()
80 	retval = osnoise_set_print_stack(tool->context, params->print_stack);  in timerlat_apply_config()
87 	 * If the user did not specify a type of thread, try user-threads first.  in timerlat_apply_config()
90 	if (!params->common.kernel_workload && !params->common.user_data) {  in timerlat_apply_config()
93 			debug_msg("User-space interface detected, setting user-threads\n");  in timerlat_apply_config()
94 			params->common.user_workload = 1;  in timerlat_apply_config()
95 			params->common.user_data = 1;  in timerlat_apply_config()
97 			debug_msg("User-space interface not detected, setting kernel-threads\n");  in timerlat_apply_config()
98 			params->common.kernel_workload = 1;  in timerlat_apply_config()
102 	return common_apply_config(tool, &params->common);  in timerlat_apply_config()
105 	return -1;  in timerlat_apply_config()
110 	struct timerlat_params *params = to_timerlat_params(tool->params);  in timerlat_enable()
113 	if (params->dma_latency >= 0) {  in timerlat_enable()
114 		dma_latency_fd = set_cpu_dma_latency(params->dma_latency);  in timerlat_enable()
117 			return -1;  in timerlat_enable()
121 	if (params->deepest_idle_state >= -1) {  in timerlat_enable()
123 			err_msg("rtla built without libcpupower, --deepest-idle-state is not supported\n");  in timerlat_enable()
124 			return -1;  in timerlat_enable()
130 			if (params->common.cpus && !CPU_ISSET(i, &params->common.monitored_cpus))  in timerlat_enable()
134 				return -1;  in timerlat_enable()
136 			if (set_deepest_cpu_idle_state(i, params->deepest_idle_state) < 0) {  in timerlat_enable()
138 				return -1;  in timerlat_enable()
143 	if (!params->no_aa) {  in timerlat_enable()
144 		tool->aa = osnoise_init_tool("timerlat_aa");  in timerlat_enable()
145 		if (!tool->aa)  in timerlat_enable()
146 			return -1;  in timerlat_enable()
148 		retval = timerlat_aa_init(tool->aa, params->dump_tasks);  in timerlat_enable()
154 		retval = enable_tracer_by_name(tool->aa->trace.inst, "timerlat");  in timerlat_enable()
161 	if (params->common.warmup > 0) {  in timerlat_enable()
162 		debug_msg("Warming up for %d seconds\n", params->common.warmup);  in timerlat_enable()
163 		sleep(params->common.warmup);  in timerlat_enable()
165 			return -1;  in timerlat_enable()
171 	 * Let the trace instance start first for the case of hitting a stop  in timerlat_enable()
175 	if (tool->record)  in timerlat_enable()
176 		trace_instance_start(&tool->record->trace);  in timerlat_enable()
177 	if (!params->no_aa)  in timerlat_enable()
178 		trace_instance_start(&tool->aa->trace);  in timerlat_enable()
179 	if (params->mode == TRACING_MODE_TRACEFS) {  in timerlat_enable()
180 		trace_instance_start(&tool->trace);  in timerlat_enable()
194 	struct timerlat_params *params = to_timerlat_params(tool->params);  in timerlat_analyze()
197 		if (!params->no_aa)  in timerlat_analyze()
198 			timerlat_auto_analysis(params->common.stop_us,  in timerlat_analyze()
199 					       params->common.stop_total_us);  in timerlat_analyze()
200 	} else if (params->common.aa_only) {  in timerlat_analyze()
204 		 * If the trace did not stop with --aa-only, at least print  in timerlat_analyze()
207 		max_lat = tracefs_instance_file_read(trace_inst->inst, "tracing_max_latency", NULL);  in timerlat_analyze()
217 	struct timerlat_params *params = to_timerlat_params(tool->params);  in timerlat_free()
223 	if (params->deepest_idle_state >= -1) {  in timerlat_free()
225 			if (params->common.cpus &&  in timerlat_free()
226 			    !CPU_ISSET(i, &params->common.monitored_cpus))  in timerlat_free()
232 	osnoise_destroy_tool(tool->aa);  in timerlat_free()
234 	if (params->mode != TRACING_MODE_TRACEFS)  in timerlat_free()
247 		"  usage: [rtla] timerlat [MODE] ...",  in timerlat_usage()
250 		"     top   - prints the summary from timerlat tracer",  in timerlat_usage()
251 		"     hist  - prints a histogram of timer latencies",  in timerlat_usage()
253 		"if no MODE is given, the top mode is called, passing the arguments",  in timerlat_usage()
276 	if ((strcmp(argv[1], "-h") == 0) || (strcmp(argv[1], "--help") == 0)) {  in timerlat_main()
278 	} else if (strncmp(argv[1], "-", 1) == 0) {  in timerlat_main()
283 		run_tool(&timerlat_top_ops, argc-1, &argv[1]);  in timerlat_main()
286 		run_tool(&timerlat_hist_ops, argc-1, &argv[1]);  in timerlat_main()