1 // SPDX-License-Identifier: GPL-2.0
4  * Tracing kernel boot-time
11 #include <linux/ftrace.h>
32 	/* Common ftrace options */  in trace_boot_set_instance_options()
63 			pr_err("Buffer size is too small: %s\n", p);  in trace_boot_set_instance_options()
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] {
329  *	sort = <SORT-KEY>[,...]
330  *	size = <ENTRIES>
346 trace_boot_compose_hist_cmd(struct xbc_node *hnode, char *buf, size_t size)  in trace_boot_compose_hist_cmd()  argument
349 	char *end = buf + size;  in trace_boot_compose_hist_cmd()
357 		if (ret == -ENOENT)  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()
369 	p = xbc_node_find_value(hnode, "size", NULL);  in trace_boot_compose_hist_cmd()
371 		append_printf(&buf, end, ":size=%s", p);  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()
420 			   struct xbc_node *hnode, char *buf, size_t size)  in trace_boot_init_histograms()  argument
431 		if (trace_boot_compose_hist_cmd(node, buf, size) == 0) {  in trace_boot_init_histograms()
442 		if (trace_boot_compose_hist_cmd(hnode, buf, size) == 0) {  in trace_boot_init_histograms()
455 			   struct xbc_node *hnode, char *buf, size_t size)  in trace_boot_init_histograms()  argument
527 	/* per-event key starts with "event.GROUP.EVENT" */  in trace_boot_init_events()
566 	xbc_node_for_each_array_value(node, "ftrace.filters", anode, p) {  in trace_boot_set_ftrace_filter()
570 		if (ftrace_set_filter(tr->ops, q, strlen(q), 0) < 0)  in trace_boot_set_ftrace_filter()
571 			pr_err("Failed to add %s to ftrace filter\n", p);  in trace_boot_set_ftrace_filter()
576 	xbc_node_for_each_array_value(node, "ftrace.notraces", anode, p) {  in trace_boot_set_ftrace_filter()
580 		if (ftrace_set_notrace(tr->ops, q, strlen(q), 0) < 0)  in trace_boot_set_ftrace_filter()
581 			pr_err("Failed to add %s to ftrace filter\n", p);  in trace_boot_set_ftrace_filter()
651 	trace_node = xbc_find_node("ftrace");  in trace_boot_init()
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