1 // SPDX-License-Identifier: GPL-2.0
4  * Tracing kernel boot-time
133 	return -ENOTSUPP;  in trace_boot_add_kprobe_event()
170 	return -ENOTSUPP;  in trace_boot_add_synth_event()
182 		return -ENOSPC;  in append_printf()
185 	ret = vsnprintf(*bufp, end - *bufp, fmt, args);  in append_printf()
186 	if (ret < end - *bufp) {  in append_printf()
190 		ret = -ERANGE;  in append_printf()
203 	while (p < end - 1 && *str != '\0') {  in append_str_nospace()
209 	if (p == end - 1) {  in append_str_nospace()
211 		return -ENOSPC;  in append_str_nospace()
213 	len = p - *bufp;  in append_str_nospace()
230 			return -EINVAL;  in trace_boot_hist_add_array()
241 		return -ENOENT;  in trace_boot_hist_add_array()
260 		return -EINVAL;  in trace_boot_hist_add_one_handler()
275 			return -EINVAL;  in trace_boot_hist_add_one_handler()
291 		return -EINVAL;  in trace_boot_hist_add_one_handler()
326  * ftrace.[instance.INSTANCE.]event.GROUP.EVENT.hist[.N] {
327  *	keys = <KEY>[,...]
329  *	sort = <SORT-KEY>[,...]
355 	ret = trace_boot_hist_add_array(hnode, &buf, end, "keys");  in trace_boot_compose_hist_cmd()
357 		if (ret == -ENOENT)  in trace_boot_compose_hist_cmd()
358 			pr_err("hist requires keys.\n");  in trace_boot_compose_hist_cmd()
359 		return -EINVAL;  in trace_boot_compose_hist_cmd()
363 	if (ret == -EINVAL)  in trace_boot_compose_hist_cmd()
366 	if (ret == -EINVAL)  in trace_boot_compose_hist_cmd()
398 		return -EINVAL;  in trace_boot_compose_hist_cmd()
401 		return -EINVAL;  in trace_boot_compose_hist_cmd()
404 		return -EINVAL;  in trace_boot_compose_hist_cmd()
412 		return -E2BIG;  in trace_boot_compose_hist_cmd()
441 	if (xbc_node_find_subkey(hnode, "keys")) {  in trace_boot_init_histograms()
468 	const char *p, *group, *event;  in trace_boot_init_one_event()  local
470 	group = xbc_node_get_data(gnode);  in trace_boot_init_one_event()
473 	if (!strcmp(group, "kprobes"))  in trace_boot_init_one_event()
476 	if (!strcmp(group, "synthetic"))  in trace_boot_init_one_event()
481 	file = find_event_file(tr, group, event);  in trace_boot_init_one_event()
483 		pr_err("Failed to find event: %s:%s\n", group, event);  in trace_boot_init_one_event()
511 				group, event);  in trace_boot_init_one_event()
527 	/* per-event key starts with "event.GROUP.EVENT" */  in trace_boot_init_events()
570 		if (ftrace_set_filter(tr->ops, q, strlen(q), 0) < 0)  in trace_boot_set_ftrace_filter()
580 		if (ftrace_set_notrace(tr->ops, q, strlen(q), 0) < 0)  in trace_boot_set_ftrace_filter()
663 	disable_tracing_selftest("running boot-time tracing");  in trace_boot_init()
668  * Start tracing at the end of core-initcall, so that it starts tracing