tools/perf/builtin-ftrace.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * builtin-ftrace.c
   4  *
   5  * Copyright (c) 2013  LG Electronics,  Namhyung Kim <namhyung@kernel.org>
   6  */
   7
   8 #include "builtin.h"
   9
  10 #include <errno.h>
  11 #include <unistd.h>
  12 #include <signal.h>
  13 #include <stdlib.h>
  14 #include <fcntl.h>
  15 #include <poll.h>
  16 #include <linux/capability.h>
  17 #include <linux/string.h>
  18
  19 #include "debug.h"
  20 #include <subcmd/pager.h>
  21 #include <subcmd/parse-options.h>
  22 #include <api/fs/tracing_path.h>
  23 #include "evlist.h"
  24 #include "target.h"
  25 #include "cpumap.h"
  26 #include "thread_map.h"
  27 #include "util/cap.h"
  28 #include "util/config.h"
  29 #include "util/units.h"
  30 #include "util/parse-sublevel-options.h"
  31
  32 #define DEFAULT_TRACER  "function_graph"
  33
  34 struct perf_ftrace {
  35         struct evlist           *evlist;
  36         struct target           target;
  37         const char              *tracer;
  38         bool                    list_avail_functions;
  39         struct list_head        filters;
  40         struct list_head        notrace;
  41         struct list_head        graph_funcs;
  42         struct list_head        nograph_funcs;
  43         int                     graph_depth;
  44         unsigned long           percpu_buffer_size;
  45         bool                    inherit;
  46         int                     func_stack_trace;
  47         int                     func_irq_info;
  48         int                     graph_nosleep_time;
  49         int                     graph_noirqs;
  50 };
  51
  52 struct filter_entry {
  53         struct list_head        list;
  54         char                    name[];
  55 };
  56
  57 static volatile int workload_exec_errno;
  58 static bool done;
  59
  60 static void sig_handler(int sig __maybe_unused)
  61 {
  62         done = true;
  63 }
  64
  65 /*
  66  * perf_evlist__prepare_workload will send a SIGUSR1 if the fork fails, since
  67  * we asked by setting its exec_error to the function below,
  68  * ftrace__workload_exec_failed_signal.
  69  *
  70  * XXX We need to handle this more appropriately, emitting an error, etc.
  71  */
  72 static void ftrace__workload_exec_failed_signal(int signo __maybe_unused,
  73                                                 siginfo_t *info __maybe_unused,
  74                                                 void *ucontext __maybe_unused)
  75 {
  76         workload_exec_errno = info->si_value.sival_int;
  77         done = true;
  78 }
  79
  80 static int __write_tracing_file(const char *name, const char *val, bool append)
  81 {
  82         char *file;
  83         int fd, ret = -1;
  84         ssize_t size = strlen(val);
  85         int flags = O_WRONLY;
  86         char errbuf[512];
  87         char *val_copy;
  88
  89         file = get_tracing_file(name);
  90         if (!file) {
  91                 pr_debug("cannot get tracing file: %s\n", name);
  92                 return -1;
  93         }
  94
  95         if (append)
  96                 flags |= O_APPEND;
  97         else
  98                 flags |= O_TRUNC;
  99
 100         fd = open(file, flags);
 101         if (fd < 0) {
 102                 pr_debug("cannot open tracing file: %s: %s\n",
 103                          name, str_error_r(errno, errbuf, sizeof(errbuf)));
 104                 goto out;
 105         }
 106
 107         /*
 108          * Copy the original value and append a '\n'. Without this,
 109          * the kernel can hide possible errors.
 110          */
 111         val_copy = strdup(val);
 112         if (!val_copy)
 113                 goto out_close;
 114         val_copy[size] = '\n';
 115
 116         if (write(fd, val_copy, size + 1) == size + 1)
 117                 ret = 0;
 118         else
 119                 pr_debug("write '%s' to tracing/%s failed: %s\n",
 120                          val, name, str_error_r(errno, errbuf, sizeof(errbuf)));
 121
 122         free(val_copy);
 123 out_close:
 124         close(fd);
 125 out:
 126         put_tracing_file(file);
 127         return ret;
 128 }
 129
 130 static int write_tracing_file(const char *name, const char *val)
 131 {
 132         return __write_tracing_file(name, val, false);
 133 }
 134
 135 static int append_tracing_file(const char *name, const char *val)
 136 {
 137         return __write_tracing_file(name, val, true);
 138 }
 139
 140 static int read_tracing_file_to_stdout(const char *name)
 141 {
 142         char buf[4096];
 143         char *file;
 144         int fd;
 145         int ret = -1;
 146
 147         file = get_tracing_file(name);
 148         if (!file) {
 149                 pr_debug("cannot get tracing file: %s\n", name);
 150                 return -1;
 151         }
 152
 153         fd = open(file, O_RDONLY);
 154         if (fd < 0) {
 155                 pr_debug("cannot open tracing file: %s: %s\n",
 156                          name, str_error_r(errno, buf, sizeof(buf)));
 157                 goto out;
 158         }
 159
 160         /* read contents to stdout */
 161         while (true) {
 162                 int n = read(fd, buf, sizeof(buf));
 163                 if (n == 0)
 164                         break;
 165                 else if (n < 0)
 166                         goto out_close;
 167
 168                 if (fwrite(buf, n, 1, stdout) != 1)
 169                         goto out_close;
 170         }
 171         ret = 0;
 172
 173 out_close:
 174         close(fd);
 175 out:
 176         put_tracing_file(file);
 177         return ret;
 178 }
 179
 180 static int write_tracing_file_int(const char *name, int value)
 181 {
 182         char buf[16];
 183
 184         snprintf(buf, sizeof(buf), "%d", value);
 185         if (write_tracing_file(name, buf) < 0)
 186                 return -1;
 187
 188         return 0;
 189 }
 190
 191 static int write_tracing_option_file(const char *name, const char *val)
 192 {
 193         char *file;
 194         int ret;
 195
 196         if (asprintf(&file, "options/%s", name) < 0)
 197                 return -1;
 198
 199         ret = __write_tracing_file(file, val, false);
 200         free(file);
 201         return ret;
 202 }
 203
 204 static int reset_tracing_cpu(void);
 205 static void reset_tracing_filters(void);
 206
 207 static void reset_tracing_options(struct perf_ftrace *ftrace __maybe_unused)
 208 {
 209         write_tracing_option_file("function-fork", "0");
 210         write_tracing_option_file("func_stack_trace", "0");
 211         write_tracing_option_file("sleep-time", "1");
 212         write_tracing_option_file("funcgraph-irqs", "1");
 213         write_tracing_option_file("irq-info", "0");
 214 }
 215
 216 static int reset_tracing_files(struct perf_ftrace *ftrace __maybe_unused)
 217 {
 218         if (write_tracing_file("tracing_on", "0") < 0)
 219                 return -1;
 220
 221         if (write_tracing_file("current_tracer", "nop") < 0)
 222                 return -1;
 223
 224         if (write_tracing_file("set_ftrace_pid", " ") < 0)
 225                 return -1;
 226
 227         if (reset_tracing_cpu() < 0)
 228                 return -1;
 229
 230         if (write_tracing_file("max_graph_depth", "0") < 0)
 231                 return -1;
 232
 233         reset_tracing_filters();
 234         reset_tracing_options(ftrace);
 235         return 0;
 236 }
 237
 238 static int set_tracing_pid(struct perf_ftrace *ftrace)
 239 {
 240         int i;
 241         char buf[16];
 242
 243         if (target__has_cpu(&ftrace->target))
 244                 return 0;
 245
 246         for (i = 0; i < perf_thread_map__nr(ftrace->evlist->core.threads); i++) {
 247                 scnprintf(buf, sizeof(buf), "%d",
 248                           ftrace->evlist->core.threads->map[i]);
 249                 if (append_tracing_file("set_ftrace_pid", buf) < 0)
 250                         return -1;
 251         }
 252         return 0;
 253 }
 254
 255 static int set_tracing_cpumask(struct perf_cpu_map *cpumap)
 256 {
 257         char *cpumask;
 258         size_t mask_size;
 259         int ret;
 260         int last_cpu;
 261
 262         last_cpu = cpu_map__cpu(cpumap, cpumap->nr - 1);
 263         mask_size = last_cpu / 4 + 2; /* one more byte for EOS */
 264         mask_size += last_cpu / 32; /* ',' is needed for every 32th cpus */
 265
 266         cpumask = malloc(mask_size);
 267         if (cpumask == NULL) {
 268                 pr_debug("failed to allocate cpu mask\n");
 269                 return -1;
 270         }
 271
 272         cpu_map__snprint_mask(cpumap, cpumask, mask_size);
 273
 274         ret = write_tracing_file("tracing_cpumask", cpumask);
 275
 276         free(cpumask);
 277         return ret;
 278 }
 279
 280 static int set_tracing_cpu(struct perf_ftrace *ftrace)
 281 {
 282         struct perf_cpu_map *cpumap = ftrace->evlist->core.cpus;
 283
 284         if (!target__has_cpu(&ftrace->target))
 285                 return 0;
 286
 287         return set_tracing_cpumask(cpumap);
 288 }
 289
 290 static int set_tracing_func_stack_trace(struct perf_ftrace *ftrace)
 291 {
 292         if (!ftrace->func_stack_trace)
 293                 return 0;
 294
 295         if (write_tracing_option_file("func_stack_trace", "1") < 0)
 296                 return -1;
 297
 298         return 0;
 299 }
 300
 301 static int set_tracing_func_irqinfo(struct perf_ftrace *ftrace)
 302 {
 303         if (!ftrace->func_irq_info)
 304                 return 0;
 305
 306         if (write_tracing_option_file("irq-info", "1") < 0)
 307                 return -1;
 308
 309         return 0;
 310 }
 311
 312 static int reset_tracing_cpu(void)
 313 {
 314         struct perf_cpu_map *cpumap = perf_cpu_map__new(NULL);
 315         int ret;
 316
 317         ret = set_tracing_cpumask(cpumap);
 318         perf_cpu_map__put(cpumap);
 319         return ret;
 320 }
 321
 322 static int __set_tracing_filter(const char *filter_file, struct list_head *funcs)
 323 {
 324         struct filter_entry *pos;
 325
 326         list_for_each_entry(pos, funcs, list) {
 327                 if (append_tracing_file(filter_file, pos->name) < 0)
 328                         return -1;
 329         }
 330
 331         return 0;
 332 }
 333
 334 static int set_tracing_filters(struct perf_ftrace *ftrace)
 335 {
 336         int ret;
 337
 338         ret = __set_tracing_filter("set_ftrace_filter", &ftrace->filters);
 339         if (ret < 0)
 340                 return ret;
 341
 342         ret = __set_tracing_filter("set_ftrace_notrace", &ftrace->notrace);
 343         if (ret < 0)
 344                 return ret;
 345
 346         ret = __set_tracing_filter("set_graph_function", &ftrace->graph_funcs);
 347         if (ret < 0)
 348                 return ret;
 349
 350         /* old kernels do not have this filter */
 351         __set_tracing_filter("set_graph_notrace", &ftrace->nograph_funcs);
 352
 353         return ret;
 354 }
 355
 356 static void reset_tracing_filters(void)
 357 {
 358         write_tracing_file("set_ftrace_filter", " ");
 359         write_tracing_file("set_ftrace_notrace", " ");
 360         write_tracing_file("set_graph_function", " ");
 361         write_tracing_file("set_graph_notrace", " ");
 362 }
 363
 364 static int set_tracing_depth(struct perf_ftrace *ftrace)
 365 {
 366         if (ftrace->graph_depth == 0)
 367                 return 0;
 368
 369         if (ftrace->graph_depth < 0) {
 370                 pr_err("invalid graph depth: %d\n", ftrace->graph_depth);
 371                 return -1;
 372         }
 373
 374         if (write_tracing_file_int("max_graph_depth", ftrace->graph_depth) < 0)
 375                 return -1;
 376
 377         return 0;
 378 }
 379
 380 static int set_tracing_percpu_buffer_size(struct perf_ftrace *ftrace)
 381 {
 382         int ret;
 383
 384         if (ftrace->percpu_buffer_size == 0)
 385                 return 0;
 386
 387         ret = write_tracing_file_int("buffer_size_kb",
 388                                      ftrace->percpu_buffer_size / 1024);
 389         if (ret < 0)
 390                 return ret;
 391
 392         return 0;
 393 }
 394
 395 static int set_tracing_trace_inherit(struct perf_ftrace *ftrace)
 396 {
 397         if (!ftrace->inherit)
 398                 return 0;
 399
 400         if (write_tracing_option_file("function-fork", "1") < 0)
 401                 return -1;
 402
 403         return 0;
 404 }
 405
 406 static int set_tracing_sleep_time(struct perf_ftrace *ftrace)
 407 {
 408         if (!ftrace->graph_nosleep_time)
 409                 return 0;
 410
 411         if (write_tracing_option_file("sleep-time", "0") < 0)
 412                 return -1;
 413
 414         return 0;
 415 }
 416
 417 static int set_tracing_funcgraph_irqs(struct perf_ftrace *ftrace)
 418 {
 419         if (!ftrace->graph_noirqs)
 420                 return 0;
 421
 422         if (write_tracing_option_file("funcgraph-irqs", "0") < 0)
 423                 return -1;
 424
 425         return 0;
 426 }
 427
 428 static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char **argv)
 429 {
 430         char *trace_file;
 431         int trace_fd;
 432         char buf[4096];
 433         struct pollfd pollfd = {
 434                 .events = POLLIN,
 435         };
 436
 437         if (!(perf_cap__capable(CAP_PERFMON) ||
 438               perf_cap__capable(CAP_SYS_ADMIN))) {
 439                 pr_err("ftrace only works for %s!\n",
 440 #ifdef HAVE_LIBCAP_SUPPORT
 441                 "users with the CAP_PERFMON or CAP_SYS_ADMIN capability"
 442 #else
 443                 "root"
 444 #endif
 445                 );
 446                 return -1;
 447         }
 448
 449         signal(SIGINT, sig_handler);
 450         signal(SIGUSR1, sig_handler);
 451         signal(SIGCHLD, sig_handler);
 452         signal(SIGPIPE, sig_handler);
 453
 454         if (ftrace->list_avail_functions)
 455                 return read_tracing_file_to_stdout("available_filter_functions");
 456
 457         if (reset_tracing_files(ftrace) < 0) {
 458                 pr_err("failed to reset ftrace\n");
 459                 goto out;
 460         }
 461
 462         /* reset ftrace buffer */
 463         if (write_tracing_file("trace", "0") < 0)
 464                 goto out;
 465
 466         if (argc && perf_evlist__prepare_workload(ftrace->evlist,
 467                                 &ftrace->target, argv, false,
 468                                 ftrace__workload_exec_failed_signal) < 0) {
 469                 goto out;
 470         }
 471
 472         if (set_tracing_pid(ftrace) < 0) {
 473                 pr_err("failed to set ftrace pid\n");
 474                 goto out_reset;
 475         }
 476
 477         if (set_tracing_cpu(ftrace) < 0) {
 478                 pr_err("failed to set tracing cpumask\n");
 479                 goto out_reset;
 480         }
 481
 482         if (set_tracing_func_stack_trace(ftrace) < 0) {
 483                 pr_err("failed to set tracing option func_stack_trace\n");
 484                 goto out_reset;
 485         }
 486
 487         if (set_tracing_func_irqinfo(ftrace) < 0) {
 488                 pr_err("failed to set tracing option irq-info\n");
 489                 goto out_reset;
 490         }
 491
 492         if (set_tracing_filters(ftrace) < 0) {
 493                 pr_err("failed to set tracing filters\n");
 494                 goto out_reset;
 495         }
 496
 497         if (set_tracing_depth(ftrace) < 0) {
 498                 pr_err("failed to set graph depth\n");
 499                 goto out_reset;
 500         }
 501
 502         if (set_tracing_percpu_buffer_size(ftrace) < 0) {
 503                 pr_err("failed to set tracing per-cpu buffer size\n");
 504                 goto out_reset;
 505         }
 506
 507         if (set_tracing_trace_inherit(ftrace) < 0) {
 508                 pr_err("failed to set tracing option function-fork\n");
 509                 goto out_reset;
 510         }
 511
 512         if (set_tracing_sleep_time(ftrace) < 0) {
 513                 pr_err("failed to set tracing option sleep-time\n");
 514                 goto out_reset;
 515         }
 516
 517         if (set_tracing_funcgraph_irqs(ftrace) < 0) {
 518                 pr_err("failed to set tracing option funcgraph-irqs\n");
 519                 goto out_reset;
 520         }
 521
 522         if (write_tracing_file("current_tracer", ftrace->tracer) < 0) {
 523                 pr_err("failed to set current_tracer to %s\n", ftrace->tracer);
 524                 goto out_reset;
 525         }
 526
 527         setup_pager();
 528
 529         trace_file = get_tracing_file("trace_pipe");
 530         if (!trace_file) {
 531                 pr_err("failed to open trace_pipe\n");
 532                 goto out_reset;
 533         }
 534
 535         trace_fd = open(trace_file, O_RDONLY);
 536
 537         put_tracing_file(trace_file);
 538
 539         if (trace_fd < 0) {
 540                 pr_err("failed to open trace_pipe\n");
 541                 goto out_reset;
 542         }
 543
 544         fcntl(trace_fd, F_SETFL, O_NONBLOCK);
 545         pollfd.fd = trace_fd;
 546
 547         /* display column headers */
 548         read_tracing_file_to_stdout("trace");
 549
 550         if (write_tracing_file("tracing_on", "1") < 0) {
 551                 pr_err("can't enable tracing\n");
 552                 goto out_close_fd;
 553         }
 554
 555         perf_evlist__start_workload(ftrace->evlist);
 556
 557         while (!done) {
 558                 if (poll(&pollfd, 1, -1) < 0)
 559                         break;
 560
 561                 if (pollfd.revents & POLLIN) {
 562                         int n = read(trace_fd, buf, sizeof(buf));
 563                         if (n < 0)
 564                                 break;
 565                         if (fwrite(buf, n, 1, stdout) != 1)
 566                                 break;
 567                 }
 568         }
 569
 570         write_tracing_file("tracing_on", "0");
 571
 572         if (workload_exec_errno) {
 573                 const char *emsg = str_error_r(workload_exec_errno, buf, sizeof(buf));
 574                 /* flush stdout first so below error msg appears at the end. */
 575                 fflush(stdout);
 576                 pr_err("workload failed: %s\n", emsg);
 577                 goto out_close_fd;
 578         }
 579
 580         /* read remaining buffer contents */
 581         while (true) {
 582                 int n = read(trace_fd, buf, sizeof(buf));
 583                 if (n <= 0)
 584                         break;
 585                 if (fwrite(buf, n, 1, stdout) != 1)
 586                         break;
 587         }
 588
 589 out_close_fd:
 590         close(trace_fd);
 591 out_reset:
 592         reset_tracing_files(ftrace);
 593 out:
 594         return (done && !workload_exec_errno) ? 0 : -1;
 595 }
 596
 597 static int perf_ftrace_config(const char *var, const char *value, void *cb)
 598 {
 599         struct perf_ftrace *ftrace = cb;
 600
 601         if (!strstarts(var, "ftrace."))
 602                 return 0;
 603
 604         if (strcmp(var, "ftrace.tracer"))
 605                 return -1;
 606
 607         if (!strcmp(value, "function_graph") ||
 608             !strcmp(value, "function")) {
 609                 ftrace->tracer = value;
 610                 return 0;
 611         }
 612
 613         pr_err("Please select \"function_graph\" (default) or \"function\"\n");
 614         return -1;
 615 }
 616
 617 static int parse_filter_func(const struct option *opt, const char *str,
 618                              int unset __maybe_unused)
 619 {
 620         struct list_head *head = opt->value;
 621         struct filter_entry *entry;
 622
 623         entry = malloc(sizeof(*entry) + strlen(str) + 1);
 624         if (entry == NULL)
 625                 return -ENOMEM;
 626
 627         strcpy(entry->name, str);
 628         list_add_tail(&entry->list, head);
 629
 630         return 0;
 631 }
 632
 633 static void delete_filter_func(struct list_head *head)
 634 {
 635         struct filter_entry *pos, *tmp;
 636
 637         list_for_each_entry_safe(pos, tmp, head, list) {
 638                 list_del_init(&pos->list);
 639                 free(pos);
 640         }
 641 }
 642
 643 static int parse_buffer_size(const struct option *opt,
 644                              const char *str, int unset)
 645 {
 646         unsigned long *s = (unsigned long *)opt->value;
 647         static struct parse_tag tags_size[] = {
 648                 { .tag  = 'B', .mult = 1       },
 649                 { .tag  = 'K', .mult = 1 << 10 },
 650                 { .tag  = 'M', .mult = 1 << 20 },
 651                 { .tag  = 'G', .mult = 1 << 30 },
 652                 { .tag  = 0 },
 653         };
 654         unsigned long val;
 655
 656         if (unset) {
 657                 *s = 0;
 658                 return 0;
 659         }
 660
 661         val = parse_tag_value(str, tags_size);
 662         if (val != (unsigned long) -1) {
 663                 if (val < 1024) {
 664                         pr_err("buffer size too small, must larger than 1KB.");
 665                         return -1;
 666                 }
 667                 *s = val;
 668                 return 0;
 669         }
 670
 671         return -1;
 672 }
 673
 674 static int parse_func_tracer_opts(const struct option *opt,
 675                                   const char *str, int unset)
 676 {
 677         int ret;
 678         struct perf_ftrace *ftrace = (struct perf_ftrace *) opt->value;
 679         struct sublevel_option func_tracer_opts[] = {
 680                 { .name = "call-graph", .value_ptr = &ftrace->func_stack_trace },
 681                 { .name = "irq-info",   .value_ptr = &ftrace->func_irq_info },
 682                 { .name = NULL, }
 683         };
 684
 685         if (unset)
 686                 return 0;
 687
 688         ret = perf_parse_sublevel_options(str, func_tracer_opts);
 689         if (ret)
 690                 return ret;
 691
 692         return 0;
 693 }
 694
 695 static int parse_graph_tracer_opts(const struct option *opt,
 696                                   const char *str, int unset)
 697 {
 698         int ret;
 699         struct perf_ftrace *ftrace = (struct perf_ftrace *) opt->value;
 700         struct sublevel_option graph_tracer_opts[] = {
 701                 { .name = "nosleep-time",       .value_ptr = &ftrace->graph_nosleep_time },
 702                 { .name = "noirqs",             .value_ptr = &ftrace->graph_noirqs },
 703                 { .name = NULL, }
 704         };
 705
 706         if (unset)
 707                 return 0;
 708
 709         ret = perf_parse_sublevel_options(str, graph_tracer_opts);
 710         if (ret)
 711                 return ret;
 712
 713         return 0;
 714 }
 715
 716 static void select_tracer(struct perf_ftrace *ftrace)
 717 {
 718         bool graph = !list_empty(&ftrace->graph_funcs) ||
 719                      !list_empty(&ftrace->nograph_funcs);
 720         bool func = !list_empty(&ftrace->filters) ||
 721                     !list_empty(&ftrace->notrace);
 722
 723         /* The function_graph has priority over function tracer. */
 724         if (graph)
 725                 ftrace->tracer = "function_graph";
 726         else if (func)
 727                 ftrace->tracer = "function";
 728         /* Otherwise, the default tracer is used. */
 729
 730         pr_debug("%s tracer is used\n", ftrace->tracer);
 731 }
 732
 733 int cmd_ftrace(int argc, const char **argv)
 734 {
 735         int ret;
 736         struct perf_ftrace ftrace = {
 737                 .tracer = DEFAULT_TRACER,
 738                 .target = { .uid = UINT_MAX, },
 739         };
 740         const char * const ftrace_usage[] = {
 741                 "perf ftrace [<options>] [<command>]",
 742                 "perf ftrace [<options>] -- <command> [<options>]",
 743                 NULL
 744         };
 745         const struct option ftrace_options[] = {
 746         OPT_STRING('t', "tracer", &ftrace.tracer, "tracer",
 747                    "tracer to use: function_graph(default) or function"),
 748         OPT_BOOLEAN('F', "funcs", &ftrace.list_avail_functions,
 749                     "Show available functions to filter"),
 750         OPT_STRING('p', "pid", &ftrace.target.pid, "pid",
 751                    "trace on existing process id"),
 752         OPT_INCR('v', "verbose", &verbose,
 753                  "be more verbose"),
 754         OPT_BOOLEAN('a', "all-cpus", &ftrace.target.system_wide,
 755                     "system-wide collection from all CPUs"),
 756         OPT_STRING('C', "cpu", &ftrace.target.cpu_list, "cpu",
 757                     "list of cpus to monitor"),
 758         OPT_CALLBACK('T', "trace-funcs", &ftrace.filters, "func",
 759                      "trace given functions using function tracer",
 760                      parse_filter_func),
 761         OPT_CALLBACK('N', "notrace-funcs", &ftrace.notrace, "func",
 762                      "do not trace given functions", parse_filter_func),
 763         OPT_CALLBACK(0, "func-opts", &ftrace, "options",
 764                      "function tracer options, available options: call-graph,irq-info",
 765                      parse_func_tracer_opts),
 766         OPT_CALLBACK('G', "graph-funcs", &ftrace.graph_funcs, "func",
 767                      "trace given functions using function_graph tracer",
 768                      parse_filter_func),
 769         OPT_CALLBACK('g', "nograph-funcs", &ftrace.nograph_funcs, "func",
 770                      "Set nograph filter on given functions", parse_filter_func),
 771         OPT_INTEGER('D', "graph-depth", &ftrace.graph_depth,
 772                     "Max depth for function graph tracer"),
 773         OPT_CALLBACK(0, "graph-opts", &ftrace, "options",
 774                      "graph tracer options, available options: nosleep-time,noirqs",
 775                      parse_graph_tracer_opts),
 776         OPT_CALLBACK('m', "buffer-size", &ftrace.percpu_buffer_size, "size",
 777                      "size of per cpu buffer", parse_buffer_size),
 778         OPT_BOOLEAN(0, "inherit", &ftrace.inherit,
 779                     "trace children processes"),
 780         OPT_END()
 781         };
 782
 783         INIT_LIST_HEAD(&ftrace.filters);
 784         INIT_LIST_HEAD(&ftrace.notrace);
 785         INIT_LIST_HEAD(&ftrace.graph_funcs);
 786         INIT_LIST_HEAD(&ftrace.nograph_funcs);
 787
 788         ret = perf_config(perf_ftrace_config, &ftrace);
 789         if (ret < 0)
 790                 return -1;
 791
 792         argc = parse_options(argc, argv, ftrace_options, ftrace_usage,
 793                             PARSE_OPT_STOP_AT_NON_OPTION);
 794         if (!argc && target__none(&ftrace.target))
 795                 ftrace.target.system_wide = true;
 796
 797         select_tracer(&ftrace);
 798
 799         ret = target__validate(&ftrace.target);
 800         if (ret) {
 801                 char errbuf[512];
 802
 803                 target__strerror(&ftrace.target, ret, errbuf, 512);
 804                 pr_err("%s\n", errbuf);
 805                 goto out_delete_filters;
 806         }
 807
 808         ftrace.evlist = evlist__new();
 809         if (ftrace.evlist == NULL) {
 810                 ret = -ENOMEM;
 811                 goto out_delete_filters;
 812         }
 813
 814         ret = perf_evlist__create_maps(ftrace.evlist, &ftrace.target);
 815         if (ret < 0)
 816                 goto out_delete_evlist;
 817
 818         ret = __cmd_ftrace(&ftrace, argc, argv);
 819
 820 out_delete_evlist:
 821         evlist__delete(ftrace.evlist);
 822
 823 out_delete_filters:
 824         delete_filter_func(&ftrace.filters);
 825         delete_filter_func(&ftrace.notrace);
 826         delete_filter_func(&ftrace.graph_funcs);
 827         delete_filter_func(&ftrace.nograph_funcs);
 828
 829         return ret;
 830 }