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Linux/tools/perf/builtin-probe.c

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

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