723 lines
18 KiB
C
723 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* builtin-probe.c
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*
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* Builtin probe command: Set up probe events by C expression
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*
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* Written by Masami Hiramatsu <mhiramat@redhat.com>
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*/
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#include <sys/utsname.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include "perf.h"
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#include "builtin.h"
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#include "namespaces.h"
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#include "util/strlist.h"
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#include "util/strfilter.h"
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#include "util/symbol.h"
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#include "util/debug.h"
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#include <subcmd/parse-options.h>
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#include "util/probe-finder.h"
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#include "util/probe-event.h"
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#include "util/probe-file.h"
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#include <linux/zalloc.h>
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#define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
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#define DEFAULT_FUNC_FILTER "!_*"
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#define DEFAULT_LIST_FILTER "*"
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/* Session management structure */
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static struct {
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int command; /* Command short_name */
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bool list_events;
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bool uprobes;
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bool quiet;
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bool target_used;
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int nevents;
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struct perf_probe_event events[MAX_PROBES];
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struct line_range line_range;
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char *target;
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struct strfilter *filter;
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struct nsinfo *nsi;
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} params;
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/* Parse an event definition. Note that any error must die. */
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static int parse_probe_event(const char *str)
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{
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struct perf_probe_event *pev = ¶ms.events[params.nevents];
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int ret;
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pr_debug("probe-definition(%d): %s\n", params.nevents, str);
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if (++params.nevents == MAX_PROBES) {
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pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
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return -1;
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}
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pev->uprobes = params.uprobes;
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if (params.target) {
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pev->target = strdup(params.target);
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if (!pev->target)
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return -ENOMEM;
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params.target_used = true;
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}
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pev->nsi = nsinfo__get(params.nsi);
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/* Parse a perf-probe command into event */
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ret = parse_perf_probe_command(str, pev);
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pr_debug("%d arguments\n", pev->nargs);
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return ret;
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}
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static int params_add_filter(const char *str)
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{
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const char *err = NULL;
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int ret = 0;
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pr_debug2("Add filter: %s\n", str);
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if (!params.filter) {
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params.filter = strfilter__new(str, &err);
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if (!params.filter)
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ret = err ? -EINVAL : -ENOMEM;
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} else
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ret = strfilter__or(params.filter, str, &err);
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if (ret == -EINVAL) {
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pr_err("Filter parse error at %td.\n", err - str + 1);
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pr_err("Source: \"%s\"\n", str);
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pr_err(" %*c\n", (int)(err - str + 1), '^');
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}
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return ret;
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}
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static int set_target(const char *ptr)
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{
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int found = 0;
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const char *buf;
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/*
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* The first argument after options can be an absolute path
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* to an executable / library or kernel module.
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*
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* TODO: Support relative path, and $PATH, $LD_LIBRARY_PATH,
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* short module name.
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*/
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if (!params.target && ptr && *ptr == '/') {
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params.target = strdup(ptr);
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if (!params.target)
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return -ENOMEM;
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params.target_used = false;
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found = 1;
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buf = ptr + (strlen(ptr) - 3);
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if (strcmp(buf, ".ko"))
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params.uprobes = true;
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}
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return found;
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}
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static int parse_probe_event_argv(int argc, const char **argv)
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{
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int i, len, ret, found_target;
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char *buf;
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found_target = set_target(argv[0]);
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if (found_target < 0)
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return found_target;
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if (found_target && argc == 1)
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return 0;
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/* Bind up rest arguments */
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len = 0;
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for (i = 0; i < argc; i++) {
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if (i == 0 && found_target)
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continue;
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len += strlen(argv[i]) + 1;
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}
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buf = zalloc(len + 1);
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if (buf == NULL)
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return -ENOMEM;
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len = 0;
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for (i = 0; i < argc; i++) {
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if (i == 0 && found_target)
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continue;
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len += sprintf(&buf[len], "%s ", argv[i]);
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}
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ret = parse_probe_event(buf);
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free(buf);
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return ret;
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}
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static int opt_set_target(const struct option *opt, const char *str,
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int unset __maybe_unused)
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{
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int ret = -ENOENT;
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char *tmp;
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if (str) {
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if (!strcmp(opt->long_name, "exec"))
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params.uprobes = true;
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else if (!strcmp(opt->long_name, "module"))
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params.uprobes = false;
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else
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return ret;
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/* Expand given path to absolute path, except for modulename */
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if (params.uprobes || strchr(str, '/')) {
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tmp = nsinfo__realpath(str, params.nsi);
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if (!tmp) {
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pr_warning("Failed to get the absolute path of %s: %m\n", str);
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return ret;
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}
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} else {
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tmp = strdup(str);
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if (!tmp)
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return -ENOMEM;
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}
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free(params.target);
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params.target = tmp;
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params.target_used = false;
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ret = 0;
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}
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return ret;
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}
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static int opt_set_target_ns(const struct option *opt __maybe_unused,
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const char *str, int unset __maybe_unused)
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{
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int ret = -ENOENT;
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pid_t ns_pid;
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struct nsinfo *nsip;
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if (str) {
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errno = 0;
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ns_pid = (pid_t)strtol(str, NULL, 10);
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if (errno != 0) {
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ret = -errno;
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pr_warning("Failed to parse %s as a pid: %s\n", str,
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strerror(errno));
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return ret;
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}
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nsip = nsinfo__new(ns_pid);
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if (nsip && nsip->need_setns)
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params.nsi = nsinfo__get(nsip);
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nsinfo__put(nsip);
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ret = 0;
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}
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return ret;
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}
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/* Command option callbacks */
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#ifdef HAVE_DWARF_SUPPORT
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static int opt_show_lines(const struct option *opt,
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const char *str, int unset __maybe_unused)
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{
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int ret = 0;
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if (!str)
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return 0;
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if (params.command == 'L') {
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pr_warning("Warning: more than one --line options are"
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" detected. Only the first one is valid.\n");
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return 0;
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}
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params.command = opt->short_name;
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ret = parse_line_range_desc(str, ¶ms.line_range);
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return ret;
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}
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static int opt_show_vars(const struct option *opt,
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const char *str, int unset __maybe_unused)
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{
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struct perf_probe_event *pev = ¶ms.events[params.nevents];
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int ret;
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if (!str)
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return 0;
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ret = parse_probe_event(str);
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if (!ret && pev->nargs != 0) {
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pr_err(" Error: '--vars' doesn't accept arguments.\n");
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return -EINVAL;
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}
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params.command = opt->short_name;
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return ret;
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}
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#else
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# define opt_show_lines NULL
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# define opt_show_vars NULL
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#endif
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static int opt_add_probe_event(const struct option *opt,
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const char *str, int unset __maybe_unused)
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{
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if (str) {
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params.command = opt->short_name;
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return parse_probe_event(str);
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}
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return 0;
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}
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static int opt_set_filter_with_command(const struct option *opt,
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const char *str, int unset)
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{
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if (!unset)
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params.command = opt->short_name;
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if (str)
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return params_add_filter(str);
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return 0;
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}
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static int opt_set_filter(const struct option *opt __maybe_unused,
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const char *str, int unset __maybe_unused)
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{
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if (str)
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return params_add_filter(str);
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return 0;
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}
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static int init_params(void)
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{
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return line_range__init(¶ms.line_range);
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}
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static void cleanup_params(void)
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{
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int i;
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for (i = 0; i < params.nevents; i++)
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clear_perf_probe_event(params.events + i);
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line_range__clear(¶ms.line_range);
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free(params.target);
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strfilter__delete(params.filter);
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nsinfo__put(params.nsi);
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memset(¶ms, 0, sizeof(params));
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}
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static void pr_err_with_code(const char *msg, int err)
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{
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char sbuf[STRERR_BUFSIZE];
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pr_err("%s", msg);
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pr_debug(" Reason: %s (Code: %d)",
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str_error_r(-err, sbuf, sizeof(sbuf)), err);
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pr_err("\n");
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}
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static int perf_add_probe_events(struct perf_probe_event *pevs, int npevs)
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{
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int ret;
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int i, k;
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const char *event = NULL, *group = NULL;
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ret = init_probe_symbol_maps(pevs->uprobes);
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if (ret < 0)
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return ret;
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ret = convert_perf_probe_events(pevs, npevs);
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if (ret < 0)
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goto out_cleanup;
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if (params.command == 'D') { /* it shows definition */
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ret = show_probe_trace_events(pevs, npevs);
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goto out_cleanup;
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}
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ret = apply_perf_probe_events(pevs, npevs);
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if (ret < 0)
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goto out_cleanup;
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for (i = k = 0; i < npevs; i++)
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k += pevs[i].ntevs;
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pr_info("Added new event%s\n", (k > 1) ? "s:" : ":");
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for (i = 0; i < npevs; i++) {
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struct perf_probe_event *pev = &pevs[i];
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for (k = 0; k < pev->ntevs; k++) {
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struct probe_trace_event *tev = &pev->tevs[k];
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/* We use tev's name for showing new events */
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show_perf_probe_event(tev->group, tev->event, pev,
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tev->point.module, false);
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/* Save the last valid name */
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event = tev->event;
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group = tev->group;
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}
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}
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/* Note that it is possible to skip all events because of blacklist */
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if (event) {
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/* Show how to use the event. */
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pr_info("\nYou can now use it in all perf tools, such as:\n\n");
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pr_info("\tperf record -e %s:%s -aR sleep 1\n\n", group, event);
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}
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out_cleanup:
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cleanup_perf_probe_events(pevs, npevs);
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exit_probe_symbol_maps();
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return ret;
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}
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static int del_perf_probe_caches(struct strfilter *filter)
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{
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struct probe_cache *cache;
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struct strlist *bidlist;
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struct str_node *nd;
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int ret;
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bidlist = build_id_cache__list_all(false);
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if (!bidlist) {
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ret = -errno;
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pr_debug("Failed to get buildids: %d\n", ret);
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return ret ?: -ENOMEM;
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}
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strlist__for_each_entry(nd, bidlist) {
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cache = probe_cache__new(nd->s, NULL);
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if (!cache)
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continue;
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if (probe_cache__filter_purge(cache, filter) < 0 ||
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probe_cache__commit(cache) < 0)
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pr_warning("Failed to remove entries for %s\n", nd->s);
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probe_cache__delete(cache);
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}
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return 0;
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}
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static int perf_del_probe_events(struct strfilter *filter)
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{
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int ret, ret2, ufd = -1, kfd = -1;
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char *str = strfilter__string(filter);
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struct strlist *klist = NULL, *ulist = NULL;
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struct str_node *ent;
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if (!str)
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return -EINVAL;
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pr_debug("Delete filter: \'%s\'\n", str);
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if (probe_conf.cache)
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return del_perf_probe_caches(filter);
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/* Get current event names */
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ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
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if (ret < 0)
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goto out;
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klist = strlist__new(NULL, NULL);
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ulist = strlist__new(NULL, NULL);
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if (!klist || !ulist) {
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ret = -ENOMEM;
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goto out;
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}
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ret = probe_file__get_events(kfd, filter, klist);
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if (ret == 0) {
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strlist__for_each_entry(ent, klist)
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pr_info("Removed event: %s\n", ent->s);
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ret = probe_file__del_strlist(kfd, klist);
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if (ret < 0)
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goto error;
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}
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ret2 = probe_file__get_events(ufd, filter, ulist);
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if (ret2 == 0) {
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strlist__for_each_entry(ent, ulist)
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pr_info("Removed event: %s\n", ent->s);
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ret2 = probe_file__del_strlist(ufd, ulist);
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if (ret2 < 0)
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goto error;
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}
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if (ret == -ENOENT && ret2 == -ENOENT)
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pr_warning("\"%s\" does not hit any event.\n", str);
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else
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ret = 0;
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error:
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if (kfd >= 0)
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close(kfd);
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if (ufd >= 0)
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close(ufd);
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out:
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strlist__delete(klist);
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strlist__delete(ulist);
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free(str);
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return ret;
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}
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#ifdef HAVE_DWARF_SUPPORT
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#define PROBEDEF_STR \
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"[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT [[NAME=]ARG ...]"
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#else
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#define PROBEDEF_STR "[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]"
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#endif
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|
|
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static int
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__cmd_probe(int argc, const char **argv)
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{
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const char * const probe_usage[] = {
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"perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
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"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
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"perf probe [<options>] --del '[GROUP:]EVENT' ...",
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"perf probe --list [GROUP:]EVENT ...",
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#ifdef HAVE_DWARF_SUPPORT
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|
"perf probe [<options>] --line 'LINEDESC'",
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"perf probe [<options>] --vars 'PROBEPOINT'",
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#endif
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"perf probe [<options>] --funcs",
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NULL
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};
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struct option options[] = {
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|
OPT_INCR('v', "verbose", &verbose,
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"be more verbose (show parsed arguments, etc)"),
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OPT_BOOLEAN('q', "quiet", ¶ms.quiet,
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|
"be quiet (do not show any messages)"),
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OPT_CALLBACK_DEFAULT('l', "list", NULL, "[GROUP:]EVENT",
|
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"list up probe events",
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opt_set_filter_with_command, DEFAULT_LIST_FILTER),
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OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
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opt_set_filter_with_command),
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OPT_CALLBACK('a', "add", NULL, PROBEDEF_STR,
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"probe point definition, where\n"
|
|
"\t\tGROUP:\tGroup name (optional)\n"
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|
"\t\tEVENT:\tEvent name\n"
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|
"\t\tFUNC:\tFunction name\n"
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"\t\tOFF:\tOffset from function entry (in byte)\n"
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|
"\t\t%return:\tPut the probe at function return\n"
|
|
#ifdef HAVE_DWARF_SUPPORT
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|
"\t\tSRC:\tSource code path\n"
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|
"\t\tRL:\tRelative line number from function entry.\n"
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|
"\t\tAL:\tAbsolute line number in file.\n"
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|
"\t\tPT:\tLazy expression of line code.\n"
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|
"\t\tARG:\tProbe argument (local variable name or\n"
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|
"\t\t\tkprobe-tracer argument format.)\n",
|
|
#else
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"\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
|
|
#endif
|
|
opt_add_probe_event),
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|
OPT_CALLBACK('D', "definition", NULL, PROBEDEF_STR,
|
|
"Show trace event definition of given traceevent for k/uprobe_events.",
|
|
opt_add_probe_event),
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|
OPT_BOOLEAN('f', "force", &probe_conf.force_add, "forcibly add events"
|
|
" with existing name"),
|
|
OPT_CALLBACK('L', "line", NULL,
|
|
"FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
|
|
"Show source code lines.", opt_show_lines),
|
|
OPT_CALLBACK('V', "vars", NULL,
|
|
"FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
|
|
"Show accessible variables on PROBEDEF", opt_show_vars),
|
|
OPT_BOOLEAN('\0', "externs", &probe_conf.show_ext_vars,
|
|
"Show external variables too (with --vars only)"),
|
|
OPT_BOOLEAN('\0', "range", &probe_conf.show_location_range,
|
|
"Show variables location range in scope (with --vars only)"),
|
|
OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
|
|
"file", "vmlinux pathname"),
|
|
OPT_STRING('s', "source", &symbol_conf.source_prefix,
|
|
"directory", "path to kernel source"),
|
|
OPT_BOOLEAN('\0', "no-inlines", &probe_conf.no_inlines,
|
|
"Don't search inlined functions"),
|
|
OPT__DRY_RUN(&probe_event_dry_run),
|
|
OPT_INTEGER('\0', "max-probes", &probe_conf.max_probes,
|
|
"Set how many probe points can be found for a probe."),
|
|
OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]",
|
|
"Show potential probe-able functions.",
|
|
opt_set_filter_with_command, DEFAULT_FUNC_FILTER),
|
|
OPT_CALLBACK('\0', "filter", NULL,
|
|
"[!]FILTER", "Set a filter (with --vars/funcs only)\n"
|
|
"\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
|
|
"\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
|
|
opt_set_filter),
|
|
OPT_CALLBACK('x', "exec", NULL, "executable|path",
|
|
"target executable name or path", opt_set_target),
|
|
OPT_CALLBACK('m', "module", NULL, "modname|path",
|
|
"target module name (for online) or path (for offline)",
|
|
opt_set_target),
|
|
OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
|
|
"Enable symbol demangling"),
|
|
OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
|
|
"Enable kernel symbol demangling"),
|
|
OPT_BOOLEAN(0, "cache", &probe_conf.cache, "Manipulate probe cache"),
|
|
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
|
|
"Look for files with symbols relative to this directory"),
|
|
OPT_CALLBACK(0, "target-ns", NULL, "pid",
|
|
"target pid for namespace contexts", opt_set_target_ns),
|
|
OPT_END()
|
|
};
|
|
int ret;
|
|
|
|
set_option_flag(options, 'a', "add", PARSE_OPT_EXCLUSIVE);
|
|
set_option_flag(options, 'd', "del", PARSE_OPT_EXCLUSIVE);
|
|
set_option_flag(options, 'D', "definition", PARSE_OPT_EXCLUSIVE);
|
|
set_option_flag(options, 'l', "list", PARSE_OPT_EXCLUSIVE);
|
|
#ifdef HAVE_DWARF_SUPPORT
|
|
set_option_flag(options, 'L', "line", PARSE_OPT_EXCLUSIVE);
|
|
set_option_flag(options, 'V', "vars", PARSE_OPT_EXCLUSIVE);
|
|
#else
|
|
# define set_nobuild(s, l, c) set_option_nobuild(options, s, l, "NO_DWARF=1", c)
|
|
set_nobuild('L', "line", false);
|
|
set_nobuild('V', "vars", false);
|
|
set_nobuild('\0', "externs", false);
|
|
set_nobuild('\0', "range", false);
|
|
set_nobuild('k', "vmlinux", true);
|
|
set_nobuild('s', "source", true);
|
|
set_nobuild('\0', "no-inlines", true);
|
|
# undef set_nobuild
|
|
#endif
|
|
set_option_flag(options, 'F', "funcs", PARSE_OPT_EXCLUSIVE);
|
|
|
|
argc = parse_options(argc, argv, options, probe_usage,
|
|
PARSE_OPT_STOP_AT_NON_OPTION);
|
|
if (argc > 0) {
|
|
if (strcmp(argv[0], "-") == 0) {
|
|
usage_with_options_msg(probe_usage, options,
|
|
"'-' is not supported.\n");
|
|
}
|
|
if (params.command && params.command != 'a') {
|
|
usage_with_options_msg(probe_usage, options,
|
|
"another command except --add is set.\n");
|
|
}
|
|
ret = parse_probe_event_argv(argc, argv);
|
|
if (ret < 0) {
|
|
pr_err_with_code(" Error: Command Parse Error.", ret);
|
|
return ret;
|
|
}
|
|
params.command = 'a';
|
|
}
|
|
|
|
if (params.quiet) {
|
|
if (verbose != 0) {
|
|
pr_err(" Error: -v and -q are exclusive.\n");
|
|
return -EINVAL;
|
|
}
|
|
verbose = -1;
|
|
}
|
|
|
|
if (probe_conf.max_probes == 0)
|
|
probe_conf.max_probes = MAX_PROBES;
|
|
|
|
/*
|
|
* Only consider the user's kernel image path if given.
|
|
*/
|
|
symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
|
|
|
|
/*
|
|
* Except for --list, --del and --add, other command doesn't depend
|
|
* nor change running kernel. So if user gives offline vmlinux,
|
|
* ignore its buildid.
|
|
*/
|
|
if (!strchr("lda", params.command) && symbol_conf.vmlinux_name)
|
|
symbol_conf.ignore_vmlinux_buildid = true;
|
|
|
|
switch (params.command) {
|
|
case 'l':
|
|
if (params.uprobes) {
|
|
pr_err(" Error: Don't use --list with --exec.\n");
|
|
parse_options_usage(probe_usage, options, "l", true);
|
|
parse_options_usage(NULL, options, "x", true);
|
|
return -EINVAL;
|
|
}
|
|
ret = show_perf_probe_events(params.filter);
|
|
if (ret < 0)
|
|
pr_err_with_code(" Error: Failed to show event list.", ret);
|
|
return ret;
|
|
case 'F':
|
|
ret = show_available_funcs(params.target, params.nsi,
|
|
params.filter, params.uprobes);
|
|
if (ret < 0)
|
|
pr_err_with_code(" Error: Failed to show functions.", ret);
|
|
return ret;
|
|
#ifdef HAVE_DWARF_SUPPORT
|
|
case 'L':
|
|
ret = show_line_range(¶ms.line_range, params.target,
|
|
params.nsi, params.uprobes);
|
|
if (ret < 0)
|
|
pr_err_with_code(" Error: Failed to show lines.", ret);
|
|
return ret;
|
|
case 'V':
|
|
if (!params.filter)
|
|
params.filter = strfilter__new(DEFAULT_VAR_FILTER,
|
|
NULL);
|
|
|
|
ret = show_available_vars(params.events, params.nevents,
|
|
params.filter);
|
|
if (ret < 0)
|
|
pr_err_with_code(" Error: Failed to show vars.", ret);
|
|
return ret;
|
|
#endif
|
|
case 'd':
|
|
ret = perf_del_probe_events(params.filter);
|
|
if (ret < 0) {
|
|
pr_err_with_code(" Error: Failed to delete events.", ret);
|
|
return ret;
|
|
}
|
|
break;
|
|
case 'D':
|
|
case 'a':
|
|
|
|
/* Ensure the last given target is used */
|
|
if (params.target && !params.target_used) {
|
|
pr_err(" Error: -x/-m must follow the probe definitions.\n");
|
|
parse_options_usage(probe_usage, options, "m", true);
|
|
parse_options_usage(NULL, options, "x", true);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = perf_add_probe_events(params.events, params.nevents);
|
|
if (ret < 0) {
|
|
pr_err_with_code(" Error: Failed to add events.", ret);
|
|
return ret;
|
|
}
|
|
break;
|
|
default:
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int cmd_probe(int argc, const char **argv)
|
|
{
|
|
int ret;
|
|
|
|
ret = init_params();
|
|
if (!ret) {
|
|
ret = __cmd_probe(argc, argv);
|
|
cleanup_params();
|
|
}
|
|
|
|
return ret < 0 ? ret : 0;
|
|
}
|