1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * builtin-probe.c
4 *
5 * Builtin probe command: Set up probe events by C expression
6 *
7 * Written by Masami Hiramatsu <mhiramat@redhat.com>
8 */
9 #include <sys/utsname.h>
10 #include <sys/types.h>
11 #include <sys/stat.h>
12 #include <fcntl.h>
13 #include <errno.h>
14 #include <stdio.h>
15 #include <unistd.h>
16 #include <stdlib.h>
17 #include <string.h>
18
19 #include "builtin.h"
20 #include "namespaces.h"
21 #include "util/build-id.h"
22 #include "util/strlist.h"
23 #include "util/strfilter.h"
24 #include "util/symbol.h"
25 #include "util/symbol_conf.h"
26 #include "util/debug.h"
27 #include <subcmd/parse-options.h>
28 #include "util/probe-finder.h"
29 #include "util/probe-event.h"
30 #include "util/probe-file.h"
31 #include <linux/string.h>
32 #include <linux/zalloc.h>
33
34 #define DEFAULT_VAR_FILTER "!__k???tab_* & !__crc_*"
35 #define DEFAULT_FUNC_FILTER "!_* & !*@plt"
36 #define DEFAULT_LIST_FILTER "*"
37
38 /* Session management structure */
39 static struct {
40 int command; /* Command short_name */
41 bool list_events;
42 bool uprobes;
43 bool target_used;
44 int nevents;
45 struct perf_probe_event events[MAX_PROBES];
46 struct line_range line_range;
47 char *target;
48 struct strfilter *filter;
49 struct nsinfo *nsi;
50 } *params;
51
52 /* Parse an event definition. Note that any error must die. */
parse_probe_event(const char * str)53 static int parse_probe_event(const char *str)
54 {
55 struct perf_probe_event *pev = ¶ms->events[params->nevents];
56 int ret;
57
58 pr_debug("probe-definition(%d): %s\n", params->nevents, str);
59 if (++params->nevents == MAX_PROBES) {
60 pr_err("Too many probes (> %d) were specified.", MAX_PROBES);
61 return -1;
62 }
63
64 pev->uprobes = params->uprobes;
65 if (params->target) {
66 pev->target = strdup(params->target);
67 if (!pev->target)
68 return -ENOMEM;
69 params->target_used = true;
70 }
71
72 pev->nsi = nsinfo__get(params->nsi);
73
74 /* Parse a perf-probe command into event */
75 ret = parse_perf_probe_command(str, pev);
76 pr_debug("%d arguments\n", pev->nargs);
77
78 return ret;
79 }
80
params_add_filter(const char * str)81 static int params_add_filter(const char *str)
82 {
83 const char *err = NULL;
84 int ret = 0;
85
86 pr_debug2("Add filter: %s\n", str);
87 if (!params->filter) {
88 params->filter = strfilter__new(str, &err);
89 if (!params->filter)
90 ret = err ? -EINVAL : -ENOMEM;
91 } else
92 ret = strfilter__or(params->filter, str, &err);
93
94 if (ret == -EINVAL) {
95 pr_err("Filter parse error at %td.\n", err - str + 1);
96 pr_err("Source: \"%s\"\n", str);
97 pr_err(" %*c\n", (int)(err - str + 1), '^');
98 }
99
100 return ret;
101 }
102
set_target(const char * ptr)103 static int set_target(const char *ptr)
104 {
105 int found = 0;
106 const char *buf;
107
108 /*
109 * The first argument after options can be an absolute path
110 * to an executable / library or kernel module.
111 *
112 * TODO: Support relative path, and $PATH, $LD_LIBRARY_PATH,
113 * short module name.
114 */
115 if (!params->target && ptr && *ptr == '/') {
116 params->target = strdup(ptr);
117 if (!params->target)
118 return -ENOMEM;
119 params->target_used = false;
120
121 found = 1;
122 buf = ptr + (strlen(ptr) - 3);
123
124 if (strcmp(buf, ".ko"))
125 params->uprobes = true;
126
127 }
128
129 return found;
130 }
131
parse_probe_event_argv(int argc,const char ** argv)132 static int parse_probe_event_argv(int argc, const char **argv)
133 {
134 int i, len, ret, found_target;
135 char *buf;
136
137 found_target = set_target(argv[0]);
138 if (found_target < 0)
139 return found_target;
140
141 if (found_target && argc == 1)
142 return 0;
143
144 /* Bind up rest arguments */
145 len = 0;
146 for (i = 0; i < argc; i++) {
147 if (i == 0 && found_target)
148 continue;
149
150 len += strlen(argv[i]) + 1;
151 }
152 buf = zalloc(len + 1);
153 if (buf == NULL)
154 return -ENOMEM;
155 len = 0;
156 for (i = 0; i < argc; i++) {
157 if (i == 0 && found_target)
158 continue;
159
160 len += sprintf(&buf[len], "%s ", argv[i]);
161 }
162 ret = parse_probe_event(buf);
163 free(buf);
164 return ret;
165 }
166
opt_set_target(const struct option * opt,const char * str,int unset __maybe_unused)167 static int opt_set_target(const struct option *opt, const char *str,
168 int unset __maybe_unused)
169 {
170 int ret = -ENOENT;
171 char *tmp;
172
173 if (str) {
174 if (!strcmp(opt->long_name, "exec"))
175 params->uprobes = true;
176 else if (!strcmp(opt->long_name, "module"))
177 params->uprobes = false;
178 else
179 return ret;
180
181 /* Expand given path to absolute path, except for modulename */
182 if (params->uprobes || strchr(str, '/')) {
183 tmp = nsinfo__realpath(str, params->nsi);
184 if (!tmp) {
185 pr_warning("Failed to get the absolute path of %s: %m\n", str);
186 return ret;
187 }
188 } else {
189 tmp = strdup(str);
190 if (!tmp)
191 return -ENOMEM;
192 }
193 free(params->target);
194 params->target = tmp;
195 params->target_used = false;
196 ret = 0;
197 }
198
199 return ret;
200 }
201
opt_set_target_ns(const struct option * opt __maybe_unused,const char * str,int unset __maybe_unused)202 static int opt_set_target_ns(const struct option *opt __maybe_unused,
203 const char *str, int unset __maybe_unused)
204 {
205 int ret = -ENOENT;
206 pid_t ns_pid;
207 struct nsinfo *nsip;
208
209 if (str) {
210 errno = 0;
211 ns_pid = (pid_t)strtol(str, NULL, 10);
212 if (errno != 0) {
213 ret = -errno;
214 pr_warning("Failed to parse %s as a pid: %m\n", str);
215 return ret;
216 }
217 nsip = nsinfo__new(ns_pid);
218 if (nsip && nsinfo__need_setns(nsip))
219 params->nsi = nsinfo__get(nsip);
220 nsinfo__put(nsip);
221
222 ret = 0;
223 }
224
225 return ret;
226 }
227
228
229 /* Command option callbacks */
230
231 #ifdef HAVE_LIBDW_SUPPORT
opt_show_lines(const struct option * opt,const char * str,int unset __maybe_unused)232 static int opt_show_lines(const struct option *opt,
233 const char *str, int unset __maybe_unused)
234 {
235 int ret = 0;
236
237 if (!str)
238 return 0;
239
240 if (params->command == 'L') {
241 pr_warning("Warning: more than one --line options are"
242 " detected. Only the first one is valid.\n");
243 return 0;
244 }
245
246 params->command = opt->short_name;
247 ret = parse_line_range_desc(str, ¶ms->line_range);
248
249 return ret;
250 }
251
opt_show_vars(const struct option * opt,const char * str,int unset __maybe_unused)252 static int opt_show_vars(const struct option *opt,
253 const char *str, int unset __maybe_unused)
254 {
255 struct perf_probe_event *pev = ¶ms->events[params->nevents];
256 int ret;
257
258 if (!str)
259 return 0;
260
261 ret = parse_probe_event(str);
262 if (!ret && pev->nargs != 0) {
263 pr_err(" Error: '--vars' doesn't accept arguments.\n");
264 return -EINVAL;
265 }
266 params->command = opt->short_name;
267
268 return ret;
269 }
270 #else
271 # define opt_show_lines NULL
272 # define opt_show_vars NULL
273 #endif
opt_add_probe_event(const struct option * opt,const char * str,int unset __maybe_unused)274 static int opt_add_probe_event(const struct option *opt,
275 const char *str, int unset __maybe_unused)
276 {
277 if (str) {
278 params->command = opt->short_name;
279 return parse_probe_event(str);
280 }
281
282 return 0;
283 }
284
opt_set_filter_with_command(const struct option * opt,const char * str,int unset)285 static int opt_set_filter_with_command(const struct option *opt,
286 const char *str, int unset)
287 {
288 if (!unset)
289 params->command = opt->short_name;
290
291 if (str)
292 return params_add_filter(str);
293
294 return 0;
295 }
296
opt_set_filter(const struct option * opt __maybe_unused,const char * str,int unset __maybe_unused)297 static int opt_set_filter(const struct option *opt __maybe_unused,
298 const char *str, int unset __maybe_unused)
299 {
300 if (str)
301 return params_add_filter(str);
302
303 return 0;
304 }
305
init_params(void)306 static int init_params(void)
307 {
308 int ret;
309
310 params = calloc(1, sizeof(*params));
311 if (!params)
312 return -ENOMEM;
313
314 ret = line_range__init(¶ms->line_range);
315 if (ret)
316 zfree(¶ms);
317 return ret;
318 }
319
cleanup_params(void)320 static void cleanup_params(void)
321 {
322 int i;
323
324 for (i = 0; i < params->nevents; i++)
325 clear_perf_probe_event(params->events + i);
326 line_range__clear(¶ms->line_range);
327 zfree(¶ms->target);
328 strfilter__delete(params->filter);
329 nsinfo__put(params->nsi);
330 zfree(¶ms);
331 }
332
pr_err_with_code(const char * msg,int err)333 static void pr_err_with_code(const char *msg, int err)
334 {
335 char sbuf[STRERR_BUFSIZE];
336
337 pr_err("%s", msg);
338 pr_debug(" Reason: %s (Code: %d)",
339 str_error_r(-err, sbuf, sizeof(sbuf)), err);
340 pr_err("\n");
341 }
342
perf_add_probe_events(struct perf_probe_event * pevs,int npevs)343 static int perf_add_probe_events(struct perf_probe_event *pevs, int npevs)
344 {
345 int ret;
346 int i, k;
347 const char *event = NULL, *group = NULL;
348
349 ret = init_probe_symbol_maps(pevs->uprobes);
350 if (ret < 0)
351 return ret;
352
353 ret = convert_perf_probe_events(pevs, npevs);
354 if (ret < 0)
355 goto out_cleanup;
356
357 if (params->command == 'D') { /* it shows definition */
358 if (probe_conf.bootconfig)
359 ret = show_bootconfig_events(pevs, npevs);
360 else
361 ret = show_probe_trace_events(pevs, npevs);
362 goto out_cleanup;
363 }
364
365 ret = apply_perf_probe_events(pevs, npevs);
366 if (ret < 0)
367 goto out_cleanup;
368
369 for (i = k = 0; i < npevs; i++)
370 k += pevs[i].ntevs;
371
372 pr_info("Added new event%s\n", (k > 1) ? "s:" : ":");
373 for (i = 0; i < npevs; i++) {
374 struct perf_probe_event *pev = &pevs[i];
375
376 for (k = 0; k < pev->ntevs; k++) {
377 struct probe_trace_event *tev = &pev->tevs[k];
378 /* Skipped events have no event name */
379 if (!tev->event)
380 continue;
381
382 /* We use tev's name for showing new events */
383 show_perf_probe_event(tev->group, tev->event, pev,
384 tev->point.module, false);
385
386 /* Save the last valid name */
387 event = tev->event;
388 group = tev->group;
389 }
390 }
391
392 /* Note that it is possible to skip all events because of blacklist */
393 if (event) {
394 #ifndef HAVE_LIBTRACEEVENT
395 pr_info("\nperf is not linked with libtraceevent, to use the new probe you can use tracefs:\n\n");
396 pr_info("\tcd /sys/kernel/tracing/\n");
397 pr_info("\techo 1 > events/%s/%s/enable\n", group, event);
398 pr_info("\techo 1 > tracing_on\n");
399 pr_info("\tcat trace_pipe\n");
400 pr_info("\tBefore removing the probe, echo 0 > events/%s/%s/enable\n", group, event);
401 #else
402 /* Show how to use the event. */
403 pr_info("\nYou can now use it in all perf tools, such as:\n\n");
404 pr_info("\tperf record -e %s:%s -aR sleep 1\n\n", group, event);
405 #endif
406 }
407
408 out_cleanup:
409 cleanup_perf_probe_events(pevs, npevs);
410 exit_probe_symbol_maps();
411 return ret;
412 }
413
del_perf_probe_caches(struct strfilter * filter)414 static int del_perf_probe_caches(struct strfilter *filter)
415 {
416 struct probe_cache *cache;
417 struct strlist *bidlist;
418 struct str_node *nd;
419 int ret;
420
421 bidlist = build_id_cache__list_all(false);
422 if (!bidlist) {
423 ret = -errno;
424 pr_debug("Failed to get buildids: %d\n", ret);
425 return ret ?: -ENOMEM;
426 }
427
428 strlist__for_each_entry(nd, bidlist) {
429 cache = probe_cache__new(nd->s, NULL);
430 if (!cache)
431 continue;
432 if (probe_cache__filter_purge(cache, filter) < 0 ||
433 probe_cache__commit(cache) < 0)
434 pr_warning("Failed to remove entries for %s\n", nd->s);
435 probe_cache__delete(cache);
436 }
437 return 0;
438 }
439
perf_del_probe_events(struct strfilter * filter)440 static int perf_del_probe_events(struct strfilter *filter)
441 {
442 int ret, ret2, ufd = -1, kfd = -1;
443 char *str = strfilter__string(filter);
444 struct strlist *klist = NULL, *ulist = NULL;
445 struct str_node *ent;
446
447 if (!str)
448 return -EINVAL;
449
450 pr_debug("Delete filter: \'%s\'\n", str);
451
452 if (probe_conf.cache)
453 return del_perf_probe_caches(filter);
454
455 /* Get current event names */
456 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
457 if (ret < 0)
458 goto out;
459
460 klist = strlist__new(NULL, NULL);
461 ulist = strlist__new(NULL, NULL);
462 if (!klist || !ulist) {
463 ret = -ENOMEM;
464 goto out;
465 }
466
467 ret = probe_file__get_events(kfd, filter, klist);
468 if (ret == 0) {
469 strlist__for_each_entry(ent, klist)
470 pr_info("Removed event: %s\n", ent->s);
471
472 ret = probe_file__del_strlist(kfd, klist);
473 if (ret < 0)
474 goto error;
475 } else if (ret == -ENOMEM)
476 goto error;
477
478 ret2 = probe_file__get_events(ufd, filter, ulist);
479 if (ret2 == 0) {
480 strlist__for_each_entry(ent, ulist)
481 pr_info("Removed event: %s\n", ent->s);
482
483 ret2 = probe_file__del_strlist(ufd, ulist);
484 if (ret2 < 0)
485 goto error;
486 } else if (ret2 == -ENOMEM)
487 goto error;
488
489 if (ret == -ENOENT && ret2 == -ENOENT)
490 pr_warning("\"%s\" does not hit any event.\n", str);
491 else
492 ret = 0;
493
494 error:
495 if (kfd >= 0)
496 close(kfd);
497 if (ufd >= 0)
498 close(ufd);
499 out:
500 strlist__delete(klist);
501 strlist__delete(ulist);
502 free(str);
503
504 return ret;
505 }
506
507 #ifdef HAVE_LIBDW_SUPPORT
508 #define PROBEDEF_STR \
509 "[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT [[NAME=]ARG ...]"
510 #else
511 #define PROBEDEF_STR "[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]"
512 #endif
513
514
515 static int
__cmd_probe(int argc,const char ** argv)516 __cmd_probe(int argc, const char **argv)
517 {
518 const char * const probe_usage[] = {
519 "perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
520 "perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
521 "perf probe [<options>] --del '[GROUP:]EVENT' ...",
522 "perf probe --list [GROUP:]EVENT ...",
523 #ifdef HAVE_LIBDW_SUPPORT
524 "perf probe [<options>] --line 'LINEDESC'",
525 "perf probe [<options>] --vars 'PROBEPOINT'",
526 #endif
527 "perf probe [<options>] --funcs",
528 NULL
529 };
530 struct option options[] = {
531 OPT_INCR('v', "verbose", &verbose,
532 "be more verbose (show parsed arguments, etc)"),
533 OPT_BOOLEAN('q', "quiet", &quiet,
534 "be quiet (do not show any warnings or messages)"),
535 OPT_CALLBACK_DEFAULT('l', "list", NULL, "[GROUP:]EVENT",
536 "list up probe events",
537 opt_set_filter_with_command, DEFAULT_LIST_FILTER),
538 OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
539 opt_set_filter_with_command),
540 OPT_CALLBACK('a', "add", NULL, PROBEDEF_STR,
541 "probe point definition, where\n"
542 "\t\tGROUP:\tGroup name (optional)\n"
543 "\t\tEVENT:\tEvent name\n"
544 "\t\tFUNC:\tFunction name\n"
545 "\t\tOFF:\tOffset from function entry (in byte)\n"
546 "\t\t%return:\tPut the probe at function return\n"
547 #ifdef HAVE_LIBDW_SUPPORT
548 "\t\tSRC:\tSource code path\n"
549 "\t\tRL:\tRelative line number from function entry.\n"
550 "\t\tAL:\tAbsolute line number in file.\n"
551 "\t\tPT:\tLazy expression of line code.\n"
552 "\t\tARG:\tProbe argument (local variable name or\n"
553 "\t\t\tkprobe-tracer argument format.)\n",
554 #else
555 "\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
556 #endif
557 opt_add_probe_event),
558 OPT_CALLBACK('D', "definition", NULL, PROBEDEF_STR,
559 "Show trace event definition of given traceevent for k/uprobe_events.",
560 opt_add_probe_event),
561 OPT_BOOLEAN('f', "force", &probe_conf.force_add, "forcibly add events"
562 " with existing name"),
563 OPT_CALLBACK('L', "line", NULL,
564 "FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
565 "Show source code lines.", opt_show_lines),
566 OPT_CALLBACK('V', "vars", NULL,
567 "FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
568 "Show accessible variables on PROBEDEF", opt_show_vars),
569 OPT_BOOLEAN('\0', "externs", &probe_conf.show_ext_vars,
570 "Show external variables too (with --vars only)"),
571 OPT_BOOLEAN('\0', "range", &probe_conf.show_location_range,
572 "Show variables location range in scope (with --vars only)"),
573 OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
574 "file", "vmlinux pathname"),
575 OPT_STRING('s', "source", &symbol_conf.source_prefix,
576 "directory", "path to kernel source"),
577 OPT_BOOLEAN('\0', "no-inlines", &probe_conf.no_inlines,
578 "Don't search inlined functions"),
579 OPT__DRY_RUN(&probe_event_dry_run),
580 OPT_INTEGER('\0', "max-probes", &probe_conf.max_probes,
581 "Set how many probe points can be found for a probe."),
582 OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]",
583 "Show potential probe-able functions.",
584 opt_set_filter_with_command, DEFAULT_FUNC_FILTER),
585 OPT_CALLBACK('\0', "filter", NULL,
586 "[!]FILTER", "Set a filter (with --vars/funcs only)\n"
587 "\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
588 "\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
589 opt_set_filter),
590 OPT_CALLBACK('x', "exec", NULL, "executable|path",
591 "target executable name or path", opt_set_target),
592 OPT_CALLBACK('m', "module", NULL, "modname|path",
593 "target module name (for online) or path (for offline)",
594 opt_set_target),
595 OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
596 "Enable symbol demangling"),
597 OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
598 "Enable kernel symbol demangling"),
599 OPT_BOOLEAN(0, "cache", &probe_conf.cache, "Manipulate probe cache"),
600 OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
601 "Look for files with symbols relative to this directory"),
602 OPT_CALLBACK(0, "target-ns", NULL, "pid",
603 "target pid for namespace contexts", opt_set_target_ns),
604 OPT_BOOLEAN(0, "bootconfig", &probe_conf.bootconfig,
605 "Output probe definition with bootconfig format"),
606 OPT_END()
607 };
608 int ret;
609
610 set_option_flag(options, 'a', "add", PARSE_OPT_EXCLUSIVE);
611 set_option_flag(options, 'd', "del", PARSE_OPT_EXCLUSIVE);
612 set_option_flag(options, 'D', "definition", PARSE_OPT_EXCLUSIVE);
613 set_option_flag(options, 'l', "list", PARSE_OPT_EXCLUSIVE);
614 #ifdef HAVE_LIBDW_SUPPORT
615 set_option_flag(options, 'L', "line", PARSE_OPT_EXCLUSIVE);
616 set_option_flag(options, 'V', "vars", PARSE_OPT_EXCLUSIVE);
617 #else
618 # define set_nobuild(s, l, c) set_option_nobuild(options, s, l, "NO_LIBDW=1", c)
619 set_nobuild('L', "line", false);
620 set_nobuild('V', "vars", false);
621 set_nobuild('\0', "externs", false);
622 set_nobuild('\0', "range", false);
623 set_nobuild('k', "vmlinux", true);
624 set_nobuild('s', "source", true);
625 set_nobuild('\0', "no-inlines", true);
626 # undef set_nobuild
627 #endif
628 set_option_flag(options, 'F', "funcs", PARSE_OPT_EXCLUSIVE);
629
630 argc = parse_options(argc, argv, options, probe_usage,
631 PARSE_OPT_STOP_AT_NON_OPTION);
632
633 if (quiet) {
634 if (verbose != 0) {
635 pr_err(" Error: -v and -q are exclusive.\n");
636 return -EINVAL;
637 }
638 verbose = -1;
639 }
640
641 if (argc > 0) {
642 if (strcmp(argv[0], "-") == 0) {
643 usage_with_options_msg(probe_usage, options,
644 "'-' is not supported.\n");
645 }
646 if (params->command && params->command != 'a') {
647 usage_with_options_msg(probe_usage, options,
648 "another command except --add is set.\n");
649 }
650 ret = parse_probe_event_argv(argc, argv);
651 if (ret < 0) {
652 pr_err_with_code(" Error: Command Parse Error.", ret);
653 return ret;
654 }
655 params->command = 'a';
656 }
657
658 ret = symbol__validate_sym_arguments();
659 if (ret)
660 return ret;
661
662 if (probe_conf.max_probes == 0)
663 probe_conf.max_probes = MAX_PROBES;
664
665 /*
666 * Only consider the user's kernel image path if given.
667 */
668 symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
669
670 /*
671 * Except for --list, --del and --add, other command doesn't depend
672 * nor change running kernel. So if user gives offline vmlinux,
673 * ignore its buildid.
674 */
675 if (!strchr("lda", params->command) && symbol_conf.vmlinux_name)
676 symbol_conf.ignore_vmlinux_buildid = true;
677
678 switch (params->command) {
679 case 'l':
680 if (params->uprobes) {
681 pr_err(" Error: Don't use --list with --exec.\n");
682 parse_options_usage(probe_usage, options, "l", true);
683 parse_options_usage(NULL, options, "x", true);
684 return -EINVAL;
685 }
686 ret = show_perf_probe_events(params->filter);
687 if (ret < 0)
688 pr_err_with_code(" Error: Failed to show event list.", ret);
689 return ret;
690 case 'F':
691 ret = show_available_funcs(params->target, params->nsi,
692 params->filter, params->uprobes);
693 if (ret < 0)
694 pr_err_with_code(" Error: Failed to show functions.", ret);
695 return ret;
696 #ifdef HAVE_LIBDW_SUPPORT
697 case 'L':
698 ret = show_line_range(¶ms->line_range, params->target,
699 params->nsi, params->uprobes);
700 if (ret < 0)
701 pr_err_with_code(" Error: Failed to show lines.", ret);
702 return ret;
703 case 'V':
704 if (!params->filter)
705 params->filter = strfilter__new(DEFAULT_VAR_FILTER,
706 NULL);
707
708 ret = show_available_vars(params->events, params->nevents,
709 params->filter);
710 if (ret < 0)
711 pr_err_with_code(" Error: Failed to show vars.", ret);
712 return ret;
713 #endif
714 case 'd':
715 ret = perf_del_probe_events(params->filter);
716 if (ret < 0) {
717 pr_err_with_code(" Error: Failed to delete events.", ret);
718 return ret;
719 }
720 break;
721 case 'D':
722 if (probe_conf.bootconfig && params->uprobes) {
723 pr_err(" Error: --bootconfig doesn't support uprobes.\n");
724 return -EINVAL;
725 }
726 fallthrough;
727 case 'a':
728
729 /* Ensure the last given target is used */
730 if (params->target && !params->target_used) {
731 pr_err(" Error: -x/-m must follow the probe definitions.\n");
732 parse_options_usage(probe_usage, options, "m", true);
733 parse_options_usage(NULL, options, "x", true);
734 return -EINVAL;
735 }
736
737 ret = perf_add_probe_events(params->events, params->nevents);
738 if (ret < 0) {
739
740 /*
741 * When perf_add_probe_events() fails it calls
742 * cleanup_perf_probe_events(pevs, npevs), i.e.
743 * cleanup_perf_probe_events(params->events, params->nevents), which
744 * will call clear_perf_probe_event(), so set nevents to zero
745 * to avoid cleanup_params() to call clear_perf_probe_event() again
746 * on the same pevs.
747 */
748 params->nevents = 0;
749 pr_err_with_code(" Error: Failed to add events.", ret);
750 return ret;
751 }
752 break;
753 default:
754 usage_with_options(probe_usage, options);
755 }
756 return 0;
757 }
758
cmd_probe(int argc,const char ** argv)759 int cmd_probe(int argc, const char **argv)
760 {
761 int ret;
762
763 ret = init_params();
764 if (!ret) {
765 ret = __cmd_probe(argc, argv);
766 cleanup_params();
767 }
768
769 return ret < 0 ? ret : 0;
770 }
771