4 * Builtin probe command: Set up probe events by C expression
6 * Written by Masami Hiramatsu <mhiramat@redhat.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
24 #include <sys/utsname.h>
25 #include <sys/types.h>
37 #include "util/util.h"
38 #include "util/strlist.h"
39 #include "util/strfilter.h"
40 #include "util/symbol.h"
41 #include "util/debug.h"
42 #include "util/debugfs.h"
43 #include "util/parse-options.h"
44 #include "util/probe-finder.h"
45 #include "util/probe-event.h"
47 #define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
48 #define DEFAULT_FUNC_FILTER "!_*"
49 #define MAX_PATH_LEN 256
51 /* Session management structure */
61 struct perf_probe_event events[MAX_PROBES];
62 struct strlist *dellist;
63 struct line_range line_range;
64 const char *target_module;
66 struct strfilter *filter;
69 /* Parse an event definition. Note that any error must die. */
70 static int parse_probe_event(const char *str)
72 struct perf_probe_event *pev = ¶ms.events[params.nevents];
75 pr_debug("probe-definition(%d): %s\n", params.nevents, str);
76 if (++params.nevents == MAX_PROBES) {
77 pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
81 /* Parse a perf-probe command into event */
82 ret = parse_perf_probe_command(str, pev);
83 pr_debug("%d arguments\n", pev->nargs);
88 static int parse_probe_event_argv(int argc, const char **argv)
93 /* Bind up rest arguments */
95 for (i = 0; i < argc; i++)
96 len += strlen(argv[i]) + 1;
97 buf = zalloc(len + 1);
101 for (i = 0; i < argc; i++)
102 len += sprintf(&buf[len], "%s ", argv[i]);
103 params.mod_events = true;
104 ret = parse_probe_event(buf);
109 static int opt_add_probe_event(const struct option *opt __used,
110 const char *str, int unset __used)
113 params.mod_events = true;
114 return parse_probe_event(str);
119 static int opt_del_probe_event(const struct option *opt __used,
120 const char *str, int unset __used)
123 params.mod_events = true;
125 params.dellist = strlist__new(true, NULL);
126 strlist__add(params.dellist, str);
132 static int opt_show_lines(const struct option *opt __used,
133 const char *str, int unset __used)
138 ret = parse_line_range_desc(str, ¶ms.line_range);
139 INIT_LIST_HEAD(¶ms.line_range.line_list);
140 params.show_lines = true;
145 static int opt_show_vars(const struct option *opt __used,
146 const char *str, int unset __used)
148 struct perf_probe_event *pev = ¶ms.events[params.nevents];
154 ret = parse_probe_event(str);
155 if (!ret && pev->nargs != 0) {
156 pr_err(" Error: '--vars' doesn't accept arguments.\n");
159 params.show_vars = true;
165 static int opt_set_filter(const struct option *opt __used,
166 const char *str, int unset __used)
171 pr_debug2("Set filter: %s\n", str);
173 strfilter__delete(params.filter);
174 params.filter = strfilter__new(str, &err);
175 if (!params.filter) {
176 pr_err("Filter parse error at %td.\n", err - str + 1);
177 pr_err("Source: \"%s\"\n", str);
178 pr_err(" %*c\n", (int)(err - str + 1), '^');
186 static const char * const probe_usage[] = {
187 "perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
188 "perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
189 "perf probe [<options>] --del '[GROUP:]EVENT' ...",
192 "perf probe [<options>] --line 'LINEDESC'",
193 "perf probe [<options>] --vars 'PROBEPOINT'",
198 static const struct option options[] = {
199 OPT_INCR('v', "verbose", &verbose,
200 "be more verbose (show parsed arguments, etc)"),
201 OPT_BOOLEAN('l', "list", ¶ms.list_events,
202 "list up current probe events"),
203 OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
204 opt_del_probe_event),
205 OPT_CALLBACK('a', "add", NULL,
207 "[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT"
210 "[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]",
212 "probe point definition, where\n"
213 "\t\tGROUP:\tGroup name (optional)\n"
214 "\t\tEVENT:\tEvent name\n"
215 "\t\tFUNC:\tFunction name\n"
216 "\t\tOFF:\tOffset from function entry (in byte)\n"
217 "\t\t%return:\tPut the probe at function return\n"
219 "\t\tSRC:\tSource code path\n"
220 "\t\tRL:\tRelative line number from function entry.\n"
221 "\t\tAL:\tAbsolute line number in file.\n"
222 "\t\tPT:\tLazy expression of line code.\n"
223 "\t\tARG:\tProbe argument (local variable name or\n"
224 "\t\t\tkprobe-tracer argument format.)\n",
226 "\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
228 opt_add_probe_event),
229 OPT_BOOLEAN('f', "force", ¶ms.force_add, "forcibly add events"
230 " with existing name"),
232 OPT_CALLBACK('L', "line", NULL,
233 "FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
234 "Show source code lines.", opt_show_lines),
235 OPT_CALLBACK('V', "vars", NULL,
236 "FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
237 "Show accessible variables on PROBEDEF", opt_show_vars),
238 OPT_BOOLEAN('\0', "externs", ¶ms.show_ext_vars,
239 "Show external variables too (with --vars only)"),
240 OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
241 "file", "vmlinux pathname"),
242 OPT_STRING('s', "source", &symbol_conf.source_prefix,
243 "directory", "path to kernel source"),
244 OPT_STRING('m', "module", ¶ms.target_module,
245 "modname", "target module name"),
247 OPT__DRY_RUN(&probe_event_dry_run),
248 OPT_INTEGER('\0', "max-probes", ¶ms.max_probe_points,
249 "Set how many probe points can be found for a probe."),
250 OPT_BOOLEAN('F', "funcs", ¶ms.show_funcs,
251 "Show potential probe-able functions."),
252 OPT_CALLBACK('\0', "filter", NULL,
253 "[!]FILTER", "Set a filter (with --vars/funcs only)\n"
254 "\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
255 "\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
260 int cmd_probe(int argc, const char **argv, const char *prefix __used)
264 argc = parse_options(argc, argv, options, probe_usage,
265 PARSE_OPT_STOP_AT_NON_OPTION);
267 if (strcmp(argv[0], "-") == 0) {
268 pr_warning(" Error: '-' is not supported.\n");
269 usage_with_options(probe_usage, options);
271 ret = parse_probe_event_argv(argc, argv);
273 pr_err(" Error: Parse Error. (%d)\n", ret);
278 if (params.max_probe_points == 0)
279 params.max_probe_points = MAX_PROBES;
281 if ((!params.nevents && !params.dellist && !params.list_events &&
282 !params.show_lines && !params.show_funcs))
283 usage_with_options(probe_usage, options);
286 * Only consider the user's kernel image path if given.
288 symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
290 if (params.list_events) {
291 if (params.mod_events) {
292 pr_err(" Error: Don't use --list with --add/--del.\n");
293 usage_with_options(probe_usage, options);
295 if (params.show_lines) {
296 pr_err(" Error: Don't use --list with --line.\n");
297 usage_with_options(probe_usage, options);
299 if (params.show_vars) {
300 pr_err(" Error: Don't use --list with --vars.\n");
301 usage_with_options(probe_usage, options);
303 if (params.show_funcs) {
304 pr_err(" Error: Don't use --list with --funcs.\n");
305 usage_with_options(probe_usage, options);
307 ret = show_perf_probe_events();
309 pr_err(" Error: Failed to show event list. (%d)\n",
313 if (params.show_funcs) {
314 if (params.nevents != 0 || params.dellist) {
315 pr_err(" Error: Don't use --funcs with"
317 usage_with_options(probe_usage, options);
319 if (params.show_lines) {
320 pr_err(" Error: Don't use --funcs with --line.\n");
321 usage_with_options(probe_usage, options);
323 if (params.show_vars) {
324 pr_err(" Error: Don't use --funcs with --vars.\n");
325 usage_with_options(probe_usage, options);
328 params.filter = strfilter__new(DEFAULT_FUNC_FILTER,
330 ret = show_available_funcs(params.target_module,
332 strfilter__delete(params.filter);
334 pr_err(" Error: Failed to show functions."
340 if (params.show_lines) {
341 if (params.mod_events) {
342 pr_err(" Error: Don't use --line with"
344 usage_with_options(probe_usage, options);
346 if (params.show_vars) {
347 pr_err(" Error: Don't use --line with --vars.\n");
348 usage_with_options(probe_usage, options);
351 ret = show_line_range(¶ms.line_range, params.target_module);
353 pr_err(" Error: Failed to show lines. (%d)\n", ret);
356 if (params.show_vars) {
357 if (params.mod_events) {
358 pr_err(" Error: Don't use --vars with"
360 usage_with_options(probe_usage, options);
363 params.filter = strfilter__new(DEFAULT_VAR_FILTER,
366 ret = show_available_vars(params.events, params.nevents,
367 params.max_probe_points,
368 params.target_module,
370 params.show_ext_vars);
371 strfilter__delete(params.filter);
373 pr_err(" Error: Failed to show vars. (%d)\n", ret);
378 if (params.dellist) {
379 ret = del_perf_probe_events(params.dellist);
380 strlist__delete(params.dellist);
382 pr_err(" Error: Failed to delete events. (%d)\n", ret);
387 if (params.nevents) {
388 ret = add_perf_probe_events(params.events, params.nevents,
389 params.max_probe_points,
390 params.target_module,
393 pr_err(" Error: Failed to add events. (%d)\n", ret);