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355 lines
8.4 KiB
355 lines
8.4 KiB
// 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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#include <linux/bootconfig.h> |
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#include <linux/cpumask.h> |
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#include <linux/ftrace.h> |
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#include <linux/init.h> |
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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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#include "trace.h" |
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#define MAX_BUF_LEN 256 |
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static void __init |
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trace_boot_set_instance_options(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 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, "tracing_on", NULL); |
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if (p && *p != '\0') { |
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if (kstrtoul(p, 10, &v)) |
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pr_err("Failed to set tracing on: %s\n", p); |
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if (v) |
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tracer_tracing_on(tr); |
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else |
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tracer_tracing_off(tr); |
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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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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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} |
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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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#ifdef CONFIG_KPROBE_EVENTS |
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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 dynevent_cmd cmd; |
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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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int ret = 0; |
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xbc_node_for_each_array_value(node, "probes", anode, val) { |
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kprobe_event_cmd_init(&cmd, buf, MAX_BUF_LEN); |
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ret = kprobe_event_gen_cmd_start(&cmd, event, val); |
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if (ret) { |
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pr_err("Failed to generate probe: %s\n", buf); |
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break; |
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} |
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ret = kprobe_event_gen_cmd_end(&cmd); |
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if (ret) { |
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pr_err("Failed to add probe: %s\n", buf); |
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break; |
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} |
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} |
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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_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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#ifdef CONFIG_SYNTH_EVENTS |
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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 dynevent_cmd cmd; |
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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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int ret; |
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synth_event_cmd_init(&cmd, buf, MAX_BUF_LEN); |
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ret = synth_event_gen_cmd_start(&cmd, event, NULL); |
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if (ret) |
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return ret; |
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xbc_node_for_each_array_value(node, "fields", anode, p) { |
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ret = synth_event_add_field_str(&cmd, p); |
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if (ret) |
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return ret; |
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} |
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ret = synth_event_gen_cmd_end(&cmd); |
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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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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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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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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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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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#else |
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#define trace_boot_enable_events(tr, node) do {} while (0) |
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#define trace_boot_init_events(tr, node) do {} while (0) |
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#endif |
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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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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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trace_boot_set_ftrace_filter(tr, node); |
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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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/* Since tracer can free snapshot buffer, allocate snapshot here.*/ |
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if (xbc_node_find_value(node, "alloc_snapshot", NULL)) { |
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if (tracing_alloc_snapshot_instance(tr) < 0) |
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pr_err("Failed to allocate snapshot buffer\n"); |
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} |
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} |
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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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if (!tr) { |
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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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trace_array_put(tr); |
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} |
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} |
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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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/* 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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disable_tracing_selftest("running boot-time tracing"); |
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return 0; |
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} |
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/* |
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* Start tracing at the end of core-initcall, so that it starts tracing |
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* from the beginning of postcore_initcall. |
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*/ |
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core_initcall_sync(trace_boot_init);
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