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753 lines
19 KiB
753 lines
19 KiB
// 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 <[email protected]> |
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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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|
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#include "builtin.h" |
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#include "namespaces.h" |
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#include "util/build-id.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/symbol_conf.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/string.h> |
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#include <linux/zalloc.h> |
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|
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#define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*" |
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#define DEFAULT_FUNC_FILTER "!_* & !*@plt" |
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#define DEFAULT_LIST_FILTER "*" |
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|
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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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|
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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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|
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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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|
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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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|
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pev->nsi = nsinfo__get(params.nsi); |
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|
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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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/* |
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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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if (probe_conf.bootconfig) |
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ret = show_bootconfig_events(pevs, npevs); |
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else |
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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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/* Skipped events have no event name */ |
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if (!tev->event) |
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continue; |
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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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|
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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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} else if (ret == -ENOMEM) |
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goto error; |
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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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} else if (ret2 == -ENOMEM) |
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goto error; |
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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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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" |
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"\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" |
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#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", |
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#else |
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"\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n", |
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#endif |
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opt_add_probe_event), |
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OPT_CALLBACK('D', "definition", NULL, PROBEDEF_STR, |
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"Show trace event definition of given traceevent for k/uprobe_events.", |
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opt_add_probe_event), |
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OPT_BOOLEAN('f', "force", &probe_conf.force_add, "forcibly add events" |
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" with existing name"), |
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OPT_CALLBACK('L', "line", NULL, |
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"FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]", |
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"Show source code lines.", opt_show_lines), |
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OPT_CALLBACK('V', "vars", NULL, |
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"FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT", |
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"Show accessible variables on PROBEDEF", opt_show_vars), |
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OPT_BOOLEAN('\0', "externs", &probe_conf.show_ext_vars, |
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"Show external variables too (with --vars only)"), |
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OPT_BOOLEAN('\0', "range", &probe_conf.show_location_range, |
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"Show variables location range in scope (with --vars only)"), |
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OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name, |
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"file", "vmlinux pathname"), |
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OPT_STRING('s', "source", &symbol_conf.source_prefix, |
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"directory", "path to kernel source"), |
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OPT_BOOLEAN('\0', "no-inlines", &probe_conf.no_inlines, |
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"Don't search inlined functions"), |
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OPT__DRY_RUN(&probe_event_dry_run), |
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OPT_INTEGER('\0', "max-probes", &probe_conf.max_probes, |
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"Set how many probe points can be found for a probe."), |
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OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]", |
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"Show potential probe-able functions.", |
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opt_set_filter_with_command, DEFAULT_FUNC_FILTER), |
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OPT_CALLBACK('\0', "filter", NULL, |
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"[!]FILTER", "Set a filter (with --vars/funcs only)\n" |
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"\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n" |
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"\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)", |
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opt_set_filter), |
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OPT_CALLBACK('x', "exec", NULL, "executable|path", |
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"target executable name or path", opt_set_target), |
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OPT_CALLBACK('m', "module", NULL, "modname|path", |
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"target module name (for online) or path (for offline)", |
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opt_set_target), |
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OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle, |
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"Enable symbol demangling"), |
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OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel, |
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"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_BOOLEAN(0, "bootconfig", &probe_conf.bootconfig, |
|
"Output probe definition with bootconfig format"), |
|
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'; |
|
} |
|
|
|
ret = symbol__validate_sym_arguments(); |
|
if (ret) |
|
return ret; |
|
|
|
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': |
|
if (probe_conf.bootconfig && params.uprobes) { |
|
pr_err(" Error: --bootconfig doesn't support uprobes.\n"); |
|
return -EINVAL; |
|
} |
|
__fallthrough; |
|
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) { |
|
|
|
/* |
|
* When perf_add_probe_events() fails it calls |
|
* cleanup_perf_probe_events(pevs, npevs), i.e. |
|
* cleanup_perf_probe_events(params.events, params.nevents), which |
|
* will call clear_perf_probe_event(), so set nevents to zero |
|
* to avoid cleanup_params() to call clear_perf_probe_event() again |
|
* on the same pevs. |
|
*/ |
|
params.nevents = 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; |
|
}
|
|
|