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