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![Namhyung Kim](/assets/img/avatar_default.png)
The init/exit_symbols_maps() functions are to setup and cleanup necessary info for probe events. But they need to be called from out of the probe code now, so this patch exports them. However the names are too generic, so change them to have 'probe'. :) Signed-off-by: Namhyung Kim <namhyung@kernel.org> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/1441852026-28974-2-git-send-email-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
632 lines
16 KiB
C
632 lines
16 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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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 "util/util.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 "util/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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#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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} 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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/* 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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#ifdef HAVE_DWARF_SUPPORT
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else if (!strcmp(opt->long_name, "module"))
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params.uprobes = false;
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#endif
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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 = realpath(str, NULL);
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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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/* 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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#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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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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strerror_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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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 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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/* 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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if (!klist)
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return -ENOMEM;
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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(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(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_debug("\"%s\" does not hit any event.\n", str);
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/* Note that this is silently ignored */
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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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static int
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__cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
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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 mesages)"),
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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,
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#ifdef HAVE_DWARF_SUPPORT
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"[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT"
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" [[NAME=]ARG ...]",
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#else
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"[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]",
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#endif
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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_BOOLEAN('f', "force", &probe_conf.force_add, "forcibly add events"
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" with existing name"),
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#ifdef HAVE_DWARF_SUPPORT
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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_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', "no-inlines", &probe_conf.no_inlines,
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"Don't search inlined functions"),
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#endif
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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)",
|
|
opt_set_filter),
|
|
OPT_CALLBACK('x', "exec", NULL, "executable|path",
|
|
"target executable name or path", 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_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, '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);
|
|
#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) {
|
|
pr_warning(" Error: '-' is not supported.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
if (params.command && params.command != 'a') {
|
|
pr_warning(" Error: another command except --add is set.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
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);
|
|
|
|
switch (params.command) {
|
|
case 'l':
|
|
if (params.uprobes) {
|
|
pr_warning(" Error: Don't use --list with --exec.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
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.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.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 'a':
|
|
/* Ensure the last given target is used */
|
|
if (params.target && !params.target_used) {
|
|
pr_warning(" Error: -x/-m must follow the probe definitions.\n");
|
|
usage_with_options(probe_usage, options);
|
|
}
|
|
|
|
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, const char *prefix)
|
|
{
|
|
int ret;
|
|
|
|
ret = init_params();
|
|
if (!ret) {
|
|
ret = __cmd_probe(argc, argv, prefix);
|
|
cleanup_params();
|
|
}
|
|
|
|
return ret < 0 ? ret : 0;
|
|
}
|