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. */
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
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
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
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
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
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: %s\n", str,
215 strerror(errno));
216 return ret;
217 }
218 nsip = nsinfo__new(ns_pid);
219 if (nsip && nsinfo__need_setns(nsip))
220 params->nsi = nsinfo__get(nsip);
221 nsinfo__put(nsip);
222
223 ret = 0;
224 }
225
226 return ret;
227 }
228
229
230 /* Command option callbacks */
231
232 #ifdef HAVE_DWARF_SUPPORT
233 static int opt_show_lines(const struct option *opt,
234 const char *str, int unset __maybe_unused)
235 {
236 int ret = 0;
237
238 if (!str)
239 return 0;
240
241 if (params->command == 'L') {
242 pr_warning("Warning: more than one --line options are"
243 " detected. Only the first one is valid.\n");
244 return 0;
245 }
246
247 params->command = opt->short_name;
248 ret = parse_line_range_desc(str, ¶ms->line_range);
249
250 return ret;
251 }
252
253 static int opt_show_vars(const struct option *opt,
254 const char *str, int unset __maybe_unused)
255 {
256 struct perf_probe_event *pev = ¶ms->events[params->nevents];
257 int ret;
258
259 if (!str)
260 return 0;
261
262 ret = parse_probe_event(str);
263 if (!ret && pev->nargs != 0) {
264 pr_err(" Error: '--vars' doesn't accept arguments.\n");
265 return -EINVAL;
266 }
267 params->command = opt->short_name;
268
269 return ret;
270 }
271 #else
272 # define opt_show_lines NULL
273 # define opt_show_vars NULL
274 #endif
275 static int opt_add_probe_event(const struct option *opt,
276 const char *str, int unset __maybe_unused)
277 {
278 if (str) {
279 params->command = opt->short_name;
280 return parse_probe_event(str);
281 }
282
283 return 0;
284 }
285
286 static int opt_set_filter_with_command(const struct option *opt,
287 const char *str, int unset)
288 {
289 if (!unset)
290 params->command = opt->short_name;
291
292 if (str)
293 return params_add_filter(str);
294
295 return 0;
296 }
297
298 static int opt_set_filter(const struct option *opt __maybe_unused,
299 const char *str, int unset __maybe_unused)
300 {
301 if (str)
302 return params_add_filter(str);
303
304 return 0;
305 }
306
307 static int init_params(void)
308 {
309 int ret;
310
311 params = calloc(1, sizeof(*params));
312 if (!params)
313 return -ENOMEM;
314
315 ret = line_range__init(¶ms->line_range);
316 if (ret)
317 zfree(¶ms);
318 return ret;
319 }
320
321 static void cleanup_params(void)
322 {
323 int i;
324
325 for (i = 0; i < params->nevents; i++)
326 clear_perf_probe_event(params->events + i);
327 line_range__clear(¶ms->line_range);
328 zfree(¶ms->target);
329 strfilter__delete(params->filter);
330 nsinfo__put(params->nsi);
331 zfree(¶ms);
332 }
333
334 static void pr_err_with_code(const char *msg, int err)
335 {
336 char sbuf[STRERR_BUFSIZE];
337
338 pr_err("%s", msg);
339 pr_debug(" Reason: %s (Code: %d)",
340 str_error_r(-err, sbuf, sizeof(sbuf)), err);
341 pr_err("\n");
342 }
343
344 static int perf_add_probe_events(struct perf_probe_event *pevs, int npevs)
345 {
346 int ret;
347 int i, k;
348 const char *event = NULL, *group = NULL;
349
350 ret = init_probe_symbol_maps(pevs->uprobes);
351 if (ret < 0)
352 return ret;
353
354 ret = convert_perf_probe_events(pevs, npevs);
355 if (ret < 0)
356 goto out_cleanup;
357
358 if (params->command == 'D') { /* it shows definition */
359 if (probe_conf.bootconfig)
360 ret = show_bootconfig_events(pevs, npevs);
361 else
362 ret = show_probe_trace_events(pevs, npevs);
363 goto out_cleanup;
364 }
365
366 ret = apply_perf_probe_events(pevs, npevs);
367 if (ret < 0)
368 goto out_cleanup;
369
370 for (i = k = 0; i < npevs; i++)
371 k += pevs[i].ntevs;
372
373 pr_info("Added new event%s\n", (k > 1) ? "s:" : ":");
374 for (i = 0; i < npevs; i++) {
375 struct perf_probe_event *pev = &pevs[i];
376
377 for (k = 0; k < pev->ntevs; k++) {
378 struct probe_trace_event *tev = &pev->tevs[k];
379 /* Skipped events have no event name */
380 if (!tev->event)
381 continue;
382
383 /* We use tev's name for showing new events */
384 show_perf_probe_event(tev->group, tev->event, pev,
385 tev->point.module, false);
386
387 /* Save the last valid name */
388 event = tev->event;
389 group = tev->group;
390 }
391 }
392
393 /* Note that it is possible to skip all events because of blacklist */
394 if (event) {
395 #ifndef HAVE_LIBTRACEEVENT
396 pr_info("\nperf is not linked with libtraceevent, to use the new probe you can use tracefs:\n\n");
397 pr_info("\tcd /sys/kernel/tracing/\n");
398 pr_info("\techo 1 > events/%s/%s/enable\n", group, event);
399 pr_info("\techo 1 > tracing_on\n");
400 pr_info("\tcat trace_pipe\n");
401 pr_info("\tBefore removing the probe, echo 0 > events/%s/%s/enable\n", group, event);
402 #else
403 /* Show how to use the event. */
404 pr_info("\nYou can now use it in all perf tools, such as:\n\n");
405 pr_info("\tperf record -e %s:%s -aR sleep 1\n\n", group, event);
406 #endif
407 }
408
409 out_cleanup:
410 cleanup_perf_probe_events(pevs, npevs);
411 exit_probe_symbol_maps();
412 return ret;
413 }
414
415 static int del_perf_probe_caches(struct strfilter *filter)
416 {
417 struct probe_cache *cache;
418 struct strlist *bidlist;
419 struct str_node *nd;
420 int ret;
421
422 bidlist = build_id_cache__list_all(false);
423 if (!bidlist) {
424 ret = -errno;
425 pr_debug("Failed to get buildids: %d\n", ret);
426 return ret ?: -ENOMEM;
427 }
428
429 strlist__for_each_entry(nd, bidlist) {
430 cache = probe_cache__new(nd->s, NULL);
431 if (!cache)
432 continue;
433 if (probe_cache__filter_purge(cache, filter) < 0 ||
434 probe_cache__commit(cache) < 0)
435 pr_warning("Failed to remove entries for %s\n", nd->s);
436 probe_cache__delete(cache);
437 }
438 return 0;
439 }
440
441 static int perf_del_probe_events(struct strfilter *filter)
442 {
443 int ret, ret2, ufd = -1, kfd = -1;
444 char *str = strfilter__string(filter);
445 struct strlist *klist = NULL, *ulist = NULL;
446 struct str_node *ent;
447
448 if (!str)
449 return -EINVAL;
450
451 pr_debug("Delete filter: \'%s\'\n", str);
452
453 if (probe_conf.cache)
454 return del_perf_probe_caches(filter);
455
456 /* Get current event names */
457 ret = probe_file__open_both(&kfd, &ufd, PF_FL_RW);
458 if (ret < 0)
459 goto out;
460
461 klist = strlist__new(NULL, NULL);
462 ulist = strlist__new(NULL, NULL);
463 if (!klist || !ulist) {
464 ret = -ENOMEM;
465 goto out;
466 }
467
468 ret = probe_file__get_events(kfd, filter, klist);
469 if (ret == 0) {
470 strlist__for_each_entry(ent, klist)
471 pr_info("Removed event: %s\n", ent->s);
472
473 ret = probe_file__del_strlist(kfd, klist);
474 if (ret < 0)
475 goto error;
476 } else if (ret == -ENOMEM)
477 goto error;
478
479 ret2 = probe_file__get_events(ufd, filter, ulist);
480 if (ret2 == 0) {
481 strlist__for_each_entry(ent, ulist)
482 pr_info("Removed event: %s\n", ent->s);
483
484 ret2 = probe_file__del_strlist(ufd, ulist);
485 if (ret2 < 0)
486 goto error;
487 } else if (ret2 == -ENOMEM)
488 goto error;
489
490 if (ret == -ENOENT && ret2 == -ENOENT)
491 pr_warning("\"%s\" does not hit any event.\n", str);
492 else
493 ret = 0;
494
495 error:
496 if (kfd >= 0)
497 close(kfd);
498 if (ufd >= 0)
499 close(ufd);
500 out:
501 strlist__delete(klist);
502 strlist__delete(ulist);
503 free(str);
504
505 return ret;
506 }
507
508 #ifdef HAVE_DWARF_SUPPORT
509 #define PROBEDEF_STR \
510 "[EVENT=]FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT [[NAME=]ARG ...]"
511 #else
512 #define PROBEDEF_STR "[EVENT=]FUNC[+OFF|%return] [[NAME=]ARG ...]"
513 #endif
514
515
516 static int
517 __cmd_probe(int argc, const char **argv)
518 {
519 const char * const probe_usage[] = {
520 "perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]",
521 "perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
522 "perf probe [<options>] --del '[GROUP:]EVENT' ...",
523 "perf probe --list [GROUP:]EVENT ...",
524 #ifdef HAVE_DWARF_SUPPORT
525 "perf probe [<options>] --line 'LINEDESC'",
526 "perf probe [<options>] --vars 'PROBEPOINT'",
527 #endif
528 "perf probe [<options>] --funcs",
529 NULL
530 };
531 struct option options[] = {
532 OPT_INCR('v', "verbose", &verbose,
533 "be more verbose (show parsed arguments, etc)"),
534 OPT_BOOLEAN('q', "quiet", &quiet,
535 "be quiet (do not show any warnings or messages)"),
536 OPT_CALLBACK_DEFAULT('l', "list", NULL, "[GROUP:]EVENT",
537 "list up probe events",
538 opt_set_filter_with_command, DEFAULT_LIST_FILTER),
539 OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
540 opt_set_filter_with_command),
541 OPT_CALLBACK('a', "add", NULL, PROBEDEF_STR,
542 "probe point definition, where\n"
543 "\t\tGROUP:\tGroup name (optional)\n"
544 "\t\tEVENT:\tEvent name\n"
545 "\t\tFUNC:\tFunction name\n"
546 "\t\tOFF:\tOffset from function entry (in byte)\n"
547 "\t\t%return:\tPut the probe at function return\n"
548 #ifdef HAVE_DWARF_SUPPORT
549 "\t\tSRC:\tSource code path\n"
550 "\t\tRL:\tRelative line number from function entry.\n"
551 "\t\tAL:\tAbsolute line number in file.\n"
552 "\t\tPT:\tLazy expression of line code.\n"
553 "\t\tARG:\tProbe argument (local variable name or\n"
554 "\t\t\tkprobe-tracer argument format.)\n",
555 #else
556 "\t\tARG:\tProbe argument (kprobe-tracer argument format.)\n",
557 #endif
558 opt_add_probe_event),
559 OPT_CALLBACK('D', "definition", NULL, PROBEDEF_STR,
560 "Show trace event definition of given traceevent for k/uprobe_events.",
561 opt_add_probe_event),
562 OPT_BOOLEAN('f', "force", &probe_conf.force_add, "forcibly add events"
563 " with existing name"),
564 OPT_CALLBACK('L', "line", NULL,
565 "FUNC[:RLN[+NUM|-RLN2]]|SRC:ALN[+NUM|-ALN2]",
566 "Show source code lines.", opt_show_lines),
567 OPT_CALLBACK('V', "vars", NULL,
568 "FUNC[@SRC][+OFF|%return|:RL|;PT]|SRC:AL|SRC;PT",
569 "Show accessible variables on PROBEDEF", opt_show_vars),
570 OPT_BOOLEAN('\0', "externs", &probe_conf.show_ext_vars,
571 "Show external variables too (with --vars only)"),
572 OPT_BOOLEAN('\0', "range", &probe_conf.show_location_range,
573 "Show variables location range in scope (with --vars only)"),
574 OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
575 "file", "vmlinux pathname"),
576 OPT_STRING('s', "source", &symbol_conf.source_prefix,
577 "directory", "path to kernel source"),
578 OPT_BOOLEAN('\0', "no-inlines", &probe_conf.no_inlines,
579 "Don't search inlined functions"),
580 OPT__DRY_RUN(&probe_event_dry_run),
581 OPT_INTEGER('\0', "max-probes", &probe_conf.max_probes,
582 "Set how many probe points can be found for a probe."),
583 OPT_CALLBACK_DEFAULT('F', "funcs", NULL, "[FILTER]",
584 "Show potential probe-able functions.",
585 opt_set_filter_with_command, DEFAULT_FUNC_FILTER),
586 OPT_CALLBACK('\0', "filter", NULL,
587 "[!]FILTER", "Set a filter (with --vars/funcs only)\n"
588 "\t\t\t(default: \"" DEFAULT_VAR_FILTER "\" for --vars,\n"
589 "\t\t\t \"" DEFAULT_FUNC_FILTER "\" for --funcs)",
590 opt_set_filter),
591 OPT_CALLBACK('x', "exec", NULL, "executable|path",
592 "target executable name or path", opt_set_target),
593 OPT_CALLBACK('m', "module", NULL, "modname|path",
594 "target module name (for online) or path (for offline)",
595 opt_set_target),
596 OPT_BOOLEAN(0, "demangle", &symbol_conf.demangle,
597 "Enable symbol demangling"),
598 OPT_BOOLEAN(0, "demangle-kernel", &symbol_conf.demangle_kernel,
599 "Enable kernel symbol demangling"),
600 OPT_BOOLEAN(0, "cache", &probe_conf.cache, "Manipulate probe cache"),
601 OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
602 "Look for files with symbols relative to this directory"),
603 OPT_CALLBACK(0, "target-ns", NULL, "pid",
604 "target pid for namespace contexts", opt_set_target_ns),
605 OPT_BOOLEAN(0, "bootconfig", &probe_conf.bootconfig,
606 "Output probe definition with bootconfig format"),
607 OPT_END()
608 };
609 int ret;
610
611 set_option_flag(options, 'a', "add", PARSE_OPT_EXCLUSIVE);
612 set_option_flag(options, 'd', "del", PARSE_OPT_EXCLUSIVE);
613 set_option_flag(options, 'D', "definition", PARSE_OPT_EXCLUSIVE);
614 set_option_flag(options, 'l', "list", PARSE_OPT_EXCLUSIVE);
615 #ifdef HAVE_DWARF_SUPPORT
616 set_option_flag(options, 'L', "line", PARSE_OPT_EXCLUSIVE);
617 set_option_flag(options, 'V', "vars", PARSE_OPT_EXCLUSIVE);
618 #else
619 # define set_nobuild(s, l, c) set_option_nobuild(options, s, l, "NO_DWARF=1", c)
620 set_nobuild('L', "line", false);
621 set_nobuild('V', "vars", false);
622 set_nobuild('\0', "externs", false);
623 set_nobuild('\0', "range", false);
624 set_nobuild('k', "vmlinux", true);
625 set_nobuild('s', "source", true);
626 set_nobuild('\0', "no-inlines", true);
627 # undef set_nobuild
628 #endif
629 set_option_flag(options, 'F', "funcs", PARSE_OPT_EXCLUSIVE);
630
631 argc = parse_options(argc, argv, options, probe_usage,
632 PARSE_OPT_STOP_AT_NON_OPTION);
633
634 if (quiet) {
635 if (verbose != 0) {
636 pr_err(" Error: -v and -q are exclusive.\n");
637 return -EINVAL;
638 }
639 verbose = -1;
640 }
641
642 if (argc > 0) {
643 if (strcmp(argv[0], "-") == 0) {
644 usage_with_options_msg(probe_usage, options,
645 "'-' is not supported.\n");
646 }
647 if (params->command && params->command != 'a') {
648 usage_with_options_msg(probe_usage, options,
649 "another command except --add is set.\n");
650 }
651 ret = parse_probe_event_argv(argc, argv);
652 if (ret < 0) {
653 pr_err_with_code(" Error: Command Parse Error.", ret);
654 return ret;
655 }
656 params->command = 'a';
657 }
658
659 ret = symbol__validate_sym_arguments();
660 if (ret)
661 return ret;
662
663 if (probe_conf.max_probes == 0)
664 probe_conf.max_probes = MAX_PROBES;
665
666 /*
667 * Only consider the user's kernel image path if given.
668 */
669 symbol_conf.try_vmlinux_path = (symbol_conf.vmlinux_name == NULL);
670
671 /*
672 * Except for --list, --del and --add, other command doesn't depend
673 * nor change running kernel. So if user gives offline vmlinux,
674 * ignore its buildid.
675 */
676 if (!strchr("lda", params->command) && symbol_conf.vmlinux_name)
677 symbol_conf.ignore_vmlinux_buildid = true;
678
679 switch (params->command) {
680 case 'l':
681 if (params->uprobes) {
682 pr_err(" Error: Don't use --list with --exec.\n");
683 parse_options_usage(probe_usage, options, "l", true);
684 parse_options_usage(NULL, options, "x", true);
685 return -EINVAL;
686 }
687 ret = show_perf_probe_events(params->filter);
688 if (ret < 0)
689 pr_err_with_code(" Error: Failed to show event list.", ret);
690 return ret;
691 case 'F':
692 ret = show_available_funcs(params->target, params->nsi,
693 params->filter, params->uprobes);
694 if (ret < 0)
695 pr_err_with_code(" Error: Failed to show functions.", ret);
696 return ret;
697 #ifdef HAVE_DWARF_SUPPORT
698 case 'L':
699 ret = show_line_range(¶ms->line_range, params->target,
700 params->nsi, params->uprobes);
701 if (ret < 0)
702 pr_err_with_code(" Error: Failed to show lines.", ret);
703 return ret;
704 case 'V':
705 if (!params->filter)
706 params->filter = strfilter__new(DEFAULT_VAR_FILTER,
707 NULL);
708
709 ret = show_available_vars(params->events, params->nevents,
710 params->filter);
711 if (ret < 0)
712 pr_err_with_code(" Error: Failed to show vars.", ret);
713 return ret;
714 #endif
715 case 'd':
716 ret = perf_del_probe_events(params->filter);
717 if (ret < 0) {
718 pr_err_with_code(" Error: Failed to delete events.", ret);
719 return ret;
720 }
721 break;
722 case 'D':
723 if (probe_conf.bootconfig && params->uprobes) {
724 pr_err(" Error: --bootconfig doesn't support uprobes.\n");
725 return -EINVAL;
726 }
727 fallthrough;
728 case 'a':
729
730 /* Ensure the last given target is used */
731 if (params->target && !params->target_used) {
732 pr_err(" Error: -x/-m must follow the probe definitions.\n");
733 parse_options_usage(probe_usage, options, "m", true);
734 parse_options_usage(NULL, options, "x", true);
735 return -EINVAL;
736 }
737
738 ret = perf_add_probe_events(params->events, params->nevents);
739 if (ret < 0) {
740
741 /*
742 * When perf_add_probe_events() fails it calls
743 * cleanup_perf_probe_events(pevs, npevs), i.e.
744 * cleanup_perf_probe_events(params->events, params->nevents), which
745 * will call clear_perf_probe_event(), so set nevents to zero
746 * to avoid cleanup_params() to call clear_perf_probe_event() again
747 * on the same pevs.
748 */
749 params->nevents = 0;
750 pr_err_with_code(" Error: Failed to add events.", ret);
751 return ret;
752 }
753 break;
754 default:
755 usage_with_options(probe_usage, options);
756 }
757 return 0;
758 }
759
760 int cmd_probe(int argc, const char **argv)
761 {
762 int ret;
763
764 ret = init_params();
765 if (!ret) {
766 ret = __cmd_probe(argc, argv);
767 cleanup_params();
768 }
769
770 return ret < 0 ? ret : 0;
771 }
772
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