tools/perf/builtin-probe.c

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