2020-01-11 00:06:17 +08:00
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// SPDX-License-Identifier: GPL-2.0
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/*
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* trace_boot.c
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* Tracing kernel boot-time
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*/
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#define pr_fmt(fmt) "trace_boot: " fmt
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2020-01-29 17:36:35 +08:00
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#include <linux/bootconfig.h>
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#include <linux/cpumask.h>
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2020-01-11 00:06:17 +08:00
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#include <linux/ftrace.h>
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#include <linux/init.h>
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2020-01-29 17:36:35 +08:00
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#include <linux/kernel.h>
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#include <linux/mutex.h>
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#include <linux/string.h>
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#include <linux/slab.h>
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#include <linux/trace.h>
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#include <linux/trace_events.h>
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2020-01-11 00:06:17 +08:00
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#include "trace.h"
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#define MAX_BUF_LEN 256
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static void __init
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2020-01-11 00:07:04 +08:00
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trace_boot_set_instance_options(struct trace_array *tr, struct xbc_node *node)
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2020-01-11 00:06:17 +08:00
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{
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struct xbc_node *anode;
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const char *p;
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char buf[MAX_BUF_LEN];
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unsigned long v = 0;
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/* Common ftrace options */
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xbc_node_for_each_array_value(node, "options", anode, p) {
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if (strlcpy(buf, p, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf)) {
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pr_err("String is too long: %s\n", p);
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continue;
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}
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if (trace_set_options(tr, buf) < 0)
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pr_err("Failed to set option: %s\n", buf);
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}
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p = xbc_node_find_value(node, "trace_clock", NULL);
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if (p && *p != '\0') {
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if (tracing_set_clock(tr, p) < 0)
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pr_err("Failed to set trace clock: %s\n", p);
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}
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p = xbc_node_find_value(node, "buffer_size", NULL);
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if (p && *p != '\0') {
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v = memparse(p, NULL);
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if (v < PAGE_SIZE)
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pr_err("Buffer size is too small: %s\n", p);
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if (tracing_resize_ring_buffer(tr, v, RING_BUFFER_ALL_CPUS) < 0)
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pr_err("Failed to resize trace buffer to %s\n", p);
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}
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2020-01-11 00:07:16 +08:00
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p = xbc_node_find_value(node, "cpumask", NULL);
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if (p && *p != '\0') {
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cpumask_var_t new_mask;
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if (alloc_cpumask_var(&new_mask, GFP_KERNEL)) {
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if (cpumask_parse(p, new_mask) < 0 ||
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tracing_set_cpumask(tr, new_mask) < 0)
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pr_err("Failed to set new CPU mask %s\n", p);
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free_cpumask_var(new_mask);
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}
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}
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2020-01-11 00:06:17 +08:00
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}
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#ifdef CONFIG_EVENT_TRACING
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static void __init
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trace_boot_enable_events(struct trace_array *tr, struct xbc_node *node)
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{
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struct xbc_node *anode;
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char buf[MAX_BUF_LEN];
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const char *p;
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xbc_node_for_each_array_value(node, "events", anode, p) {
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if (strlcpy(buf, p, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf)) {
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pr_err("String is too long: %s\n", p);
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continue;
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}
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if (ftrace_set_clr_event(tr, buf, 1) < 0)
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pr_err("Failed to enable event: %s\n", p);
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}
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}
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2020-01-11 00:06:29 +08:00
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2020-01-11 00:06:41 +08:00
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#ifdef CONFIG_KPROBE_EVENTS
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extern int trace_kprobe_run_command(const char *command);
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static int __init
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trace_boot_add_kprobe_event(struct xbc_node *node, const char *event)
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{
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struct xbc_node *anode;
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char buf[MAX_BUF_LEN];
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const char *val;
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char *p;
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int len;
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len = snprintf(buf, ARRAY_SIZE(buf) - 1, "p:kprobes/%s ", event);
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if (len >= ARRAY_SIZE(buf)) {
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pr_err("Event name is too long: %s\n", event);
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return -E2BIG;
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}
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p = buf + len;
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len = ARRAY_SIZE(buf) - len;
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xbc_node_for_each_array_value(node, "probes", anode, val) {
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if (strlcpy(p, val, len) >= len) {
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pr_err("Probe definition is too long: %s\n", val);
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return -E2BIG;
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}
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if (trace_kprobe_run_command(buf) < 0) {
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pr_err("Failed to add probe: %s\n", buf);
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return -EINVAL;
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}
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}
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return 0;
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}
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#else
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static inline int __init
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trace_boot_add_kprobe_event(struct xbc_node *node, const char *event)
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{
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pr_err("Kprobe event is not supported.\n");
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return -ENOTSUPP;
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}
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#endif
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2020-01-11 00:06:52 +08:00
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#ifdef CONFIG_HIST_TRIGGERS
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extern int synth_event_run_command(const char *command);
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static int __init
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trace_boot_add_synth_event(struct xbc_node *node, const char *event)
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{
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struct xbc_node *anode;
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char buf[MAX_BUF_LEN], *q;
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const char *p;
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int len, delta, ret;
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len = ARRAY_SIZE(buf);
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delta = snprintf(buf, len, "%s", event);
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if (delta >= len) {
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pr_err("Event name is too long: %s\n", event);
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return -E2BIG;
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}
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len -= delta; q = buf + delta;
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xbc_node_for_each_array_value(node, "fields", anode, p) {
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delta = snprintf(q, len, " %s;", p);
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if (delta >= len) {
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pr_err("fields string is too long: %s\n", p);
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return -E2BIG;
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}
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len -= delta; q += delta;
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}
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ret = synth_event_run_command(buf);
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if (ret < 0)
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pr_err("Failed to add synthetic event: %s\n", buf);
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return ret;
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}
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#else
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static inline int __init
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trace_boot_add_synth_event(struct xbc_node *node, const char *event)
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{
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pr_err("Synthetic event is not supported.\n");
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return -ENOTSUPP;
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}
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#endif
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2020-01-11 00:06:29 +08:00
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static void __init
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trace_boot_init_one_event(struct trace_array *tr, struct xbc_node *gnode,
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struct xbc_node *enode)
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{
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struct trace_event_file *file;
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struct xbc_node *anode;
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char buf[MAX_BUF_LEN];
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const char *p, *group, *event;
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group = xbc_node_get_data(gnode);
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event = xbc_node_get_data(enode);
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2020-01-11 00:06:41 +08:00
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if (!strcmp(group, "kprobes"))
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if (trace_boot_add_kprobe_event(enode, event) < 0)
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return;
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2020-01-11 00:06:52 +08:00
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if (!strcmp(group, "synthetic"))
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if (trace_boot_add_synth_event(enode, event) < 0)
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return;
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2020-01-11 00:06:41 +08:00
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2020-01-11 00:06:29 +08:00
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mutex_lock(&event_mutex);
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file = find_event_file(tr, group, event);
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if (!file) {
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pr_err("Failed to find event: %s:%s\n", group, event);
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goto out;
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}
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p = xbc_node_find_value(enode, "filter", NULL);
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if (p && *p != '\0') {
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if (strlcpy(buf, p, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf))
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pr_err("filter string is too long: %s\n", p);
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else if (apply_event_filter(file, buf) < 0)
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pr_err("Failed to apply filter: %s\n", buf);
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}
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xbc_node_for_each_array_value(enode, "actions", anode, p) {
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if (strlcpy(buf, p, ARRAY_SIZE(buf)) >= ARRAY_SIZE(buf))
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pr_err("action string is too long: %s\n", p);
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else if (trigger_process_regex(file, buf) < 0)
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pr_err("Failed to apply an action: %s\n", buf);
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}
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if (xbc_node_find_value(enode, "enable", NULL)) {
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if (trace_event_enable_disable(file, 1, 0) < 0)
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pr_err("Failed to enable event node: %s:%s\n",
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group, event);
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}
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out:
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mutex_unlock(&event_mutex);
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}
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static void __init
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trace_boot_init_events(struct trace_array *tr, struct xbc_node *node)
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{
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struct xbc_node *gnode, *enode;
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node = xbc_node_find_child(node, "event");
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if (!node)
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return;
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/* per-event key starts with "event.GROUP.EVENT" */
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xbc_node_for_each_child(node, gnode)
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xbc_node_for_each_child(gnode, enode)
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trace_boot_init_one_event(tr, gnode, enode);
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}
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2020-01-11 00:06:17 +08:00
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#else
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#define trace_boot_enable_events(tr, node) do {} while (0)
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2020-01-11 00:06:29 +08:00
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#define trace_boot_init_events(tr, node) do {} while (0)
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2020-01-11 00:06:17 +08:00
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#endif
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2020-01-11 00:07:28 +08:00
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#ifdef CONFIG_DYNAMIC_FTRACE
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static void __init
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trace_boot_set_ftrace_filter(struct trace_array *tr, struct xbc_node *node)
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{
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struct xbc_node *anode;
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const char *p;
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char *q;
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xbc_node_for_each_array_value(node, "ftrace.filters", anode, p) {
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q = kstrdup(p, GFP_KERNEL);
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if (!q)
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return;
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if (ftrace_set_filter(tr->ops, q, strlen(q), 0) < 0)
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pr_err("Failed to add %s to ftrace filter\n", p);
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else
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ftrace_filter_param = true;
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kfree(q);
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}
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xbc_node_for_each_array_value(node, "ftrace.notraces", anode, p) {
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q = kstrdup(p, GFP_KERNEL);
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if (!q)
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return;
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if (ftrace_set_notrace(tr->ops, q, strlen(q), 0) < 0)
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pr_err("Failed to add %s to ftrace filter\n", p);
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else
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ftrace_filter_param = true;
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kfree(q);
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}
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}
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#else
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#define trace_boot_set_ftrace_filter(tr, node) do {} while (0)
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#endif
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2020-01-11 00:06:17 +08:00
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static void __init
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trace_boot_enable_tracer(struct trace_array *tr, struct xbc_node *node)
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{
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const char *p;
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2020-01-11 00:07:28 +08:00
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trace_boot_set_ftrace_filter(tr, node);
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2020-01-11 00:06:17 +08:00
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p = xbc_node_find_value(node, "tracer", NULL);
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if (p && *p != '\0') {
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if (tracing_set_tracer(tr, p) < 0)
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pr_err("Failed to set given tracer: %s\n", p);
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}
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}
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2020-01-11 00:07:04 +08:00
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static void __init
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trace_boot_init_one_instance(struct trace_array *tr, struct xbc_node *node)
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{
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trace_boot_set_instance_options(tr, node);
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trace_boot_init_events(tr, node);
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trace_boot_enable_events(tr, node);
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trace_boot_enable_tracer(tr, node);
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}
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static void __init
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trace_boot_init_instances(struct xbc_node *node)
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{
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struct xbc_node *inode;
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struct trace_array *tr;
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const char *p;
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node = xbc_node_find_child(node, "instance");
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if (!node)
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return;
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xbc_node_for_each_child(node, inode) {
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p = xbc_node_get_data(inode);
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if (!p || *p == '\0')
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continue;
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tr = trace_array_get_by_name(p);
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2020-01-17 13:30:07 +08:00
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if (!tr) {
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2020-01-11 00:07:04 +08:00
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pr_err("Failed to get trace instance %s\n", p);
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continue;
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}
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trace_boot_init_one_instance(tr, inode);
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2020-01-25 09:47:46 +08:00
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trace_array_put(tr);
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2020-01-11 00:07:04 +08:00
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}
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}
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2020-01-11 00:06:17 +08:00
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static int __init trace_boot_init(void)
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{
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struct xbc_node *trace_node;
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struct trace_array *tr;
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trace_node = xbc_find_node("ftrace");
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if (!trace_node)
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return 0;
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tr = top_trace_array();
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if (!tr)
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return 0;
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2020-01-11 00:07:04 +08:00
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/* Global trace array is also one instance */
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trace_boot_init_one_instance(tr, trace_node);
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trace_boot_init_instances(trace_node);
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2020-01-11 00:06:17 +08:00
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return 0;
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}
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fs_initcall(trace_boot_init);
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