tools/perf/util/parse-events.c

   1
   2 #include "util.h"
   3 #include "../perf.h"
   4 #include "parse-options.h"
   5 #include "parse-events.h"
   6 #include "exec_cmd.h"
   7 #include "string.h"
   8 #include "cache.h"
   9
  10 int                                     nr_counters;
  11
  12 struct perf_counter_attr                attrs[MAX_COUNTERS];
  13
  14 struct event_symbol {
  15         u8              type;
  16         u64             config;
  17         const char      *symbol;
  18         const char      *alias;
  19 };
  20
  21 enum event_result {
  22         EVT_FAILED,
  23         EVT_HANDLED,
  24         EVT_HANDLED_ALL
  25 };
  26
  27 char debugfs_path[MAXPATHLEN];
  28
  29 #define CHW(x) .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_##x
  30 #define CSW(x) .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_##x
  31
  32 static struct event_symbol event_symbols[] = {
  33   { CHW(CPU_CYCLES),            "cpu-cycles",           "cycles"        },
  34   { CHW(INSTRUCTIONS),          "instructions",         ""              },
  35   { CHW(CACHE_REFERENCES),      "cache-references",     ""              },
  36   { CHW(CACHE_MISSES),          "cache-misses",         ""              },
  37   { CHW(BRANCH_INSTRUCTIONS),   "branch-instructions",  "branches"      },
  38   { CHW(BRANCH_MISSES),         "branch-misses",        ""              },
  39   { CHW(BUS_CYCLES),            "bus-cycles",           ""              },
  40
  41   { CSW(CPU_CLOCK),             "cpu-clock",            ""              },
  42   { CSW(TASK_CLOCK),            "task-clock",           ""              },
  43   { CSW(PAGE_FAULTS),           "page-faults",          "faults"        },
  44   { CSW(PAGE_FAULTS_MIN),       "minor-faults",         ""              },
  45   { CSW(PAGE_FAULTS_MAJ),       "major-faults",         ""              },
  46   { CSW(CONTEXT_SWITCHES),      "context-switches",     "cs"            },
  47   { CSW(CPU_MIGRATIONS),        "cpu-migrations",       "migrations"    },
  48 };
  49
  50 #define __PERF_COUNTER_FIELD(config, name) \
  51         ((config & PERF_COUNTER_##name##_MASK) >> PERF_COUNTER_##name##_SHIFT)
  52
  53 #define PERF_COUNTER_RAW(config)        __PERF_COUNTER_FIELD(config, RAW)
  54 #define PERF_COUNTER_CONFIG(config)     __PERF_COUNTER_FIELD(config, CONFIG)
  55 #define PERF_COUNTER_TYPE(config)       __PERF_COUNTER_FIELD(config, TYPE)
  56 #define PERF_COUNTER_ID(config)         __PERF_COUNTER_FIELD(config, EVENT)
  57
  58 static const char *hw_event_names[] = {
  59         "cycles",
  60         "instructions",
  61         "cache-references",
  62         "cache-misses",
  63         "branches",
  64         "branch-misses",
  65         "bus-cycles",
  66 };
  67
  68 static const char *sw_event_names[] = {
  69         "cpu-clock-msecs",
  70         "task-clock-msecs",
  71         "page-faults",
  72         "context-switches",
  73         "CPU-migrations",
  74         "minor-faults",
  75         "major-faults",
  76 };
  77
  78 #define MAX_ALIASES 8
  79
  80 static const char *hw_cache[][MAX_ALIASES] = {
  81  { "L1-dcache", "l1-d",         "l1d",          "L1-data",              },
  82  { "L1-icache", "l1-i",         "l1i",          "L1-instruction",       },
  83  { "LLC",       "L2"                                                    },
  84  { "dTLB",      "d-tlb",        "Data-TLB",                             },
  85  { "iTLB",      "i-tlb",        "Instruction-TLB",                      },
  86  { "branch",    "branches",     "bpu",          "btb",          "bpc",  },
  87 };
  88
  89 static const char *hw_cache_op[][MAX_ALIASES] = {
  90  { "load",      "loads",        "read",                                 },
  91  { "store",     "stores",       "write",                                },
  92  { "prefetch",  "prefetches",   "speculative-read", "speculative-load", },
  93 };
  94
  95 static const char *hw_cache_result[][MAX_ALIASES] = {
  96  { "refs",      "Reference",    "ops",          "access",               },
  97  { "misses",    "miss",                                                 },
  98 };
  99
 100 #define C(x)            PERF_COUNT_HW_CACHE_##x
 101 #define CACHE_READ      (1 << C(OP_READ))
 102 #define CACHE_WRITE     (1 << C(OP_WRITE))
 103 #define CACHE_PREFETCH  (1 << C(OP_PREFETCH))
 104 #define COP(x)          (1 << x)
 105
 106 /*
 107  * cache operartion stat
 108  * L1I : Read and prefetch only
 109  * ITLB and BPU : Read-only
 110  */
 111 static unsigned long hw_cache_stat[C(MAX)] = {
 112  [C(L1D)]       = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 113  [C(L1I)]       = (CACHE_READ | CACHE_PREFETCH),
 114  [C(LL)]        = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 115  [C(DTLB)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 116  [C(ITLB)]      = (CACHE_READ),
 117  [C(BPU)]       = (CACHE_READ),
 118 };
 119
 120 #define for_each_subsystem(sys_dir, sys_dirent, sys_next)              \
 121         while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next)        \
 122         if (sys_dirent.d_type == DT_DIR &&                                     \
 123            (strcmp(sys_dirent.d_name, ".")) &&                                 \
 124            (strcmp(sys_dirent.d_name, "..")))
 125
 126 static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
 127 {
 128         char evt_path[MAXPATHLEN];
 129         int fd;
 130
 131         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
 132                         sys_dir->d_name, evt_dir->d_name);
 133         fd = open(evt_path, O_RDONLY);
 134         if (fd < 0)
 135                 return -EINVAL;
 136         close(fd);
 137
 138         return 0;
 139 }
 140
 141 #define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next)              \
 142         while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next)        \
 143         if (evt_dirent.d_type == DT_DIR &&                                     \
 144            (strcmp(evt_dirent.d_name, ".")) &&                                 \
 145            (strcmp(evt_dirent.d_name, "..")) &&                                \
 146            (!tp_event_has_id(&sys_dirent, &evt_dirent)))
 147
 148 #define MAX_EVENT_LENGTH 512
 149
 150 int valid_debugfs_mount(const char *debugfs)
 151 {
 152         struct statfs st_fs;
 153
 154         if (statfs(debugfs, &st_fs) < 0)
 155                 return -ENOENT;
 156         else if (st_fs.f_type != (long) DEBUGFS_MAGIC)
 157                 return -ENOENT;
 158         return 0;
 159 }
 160
 161 struct tracepoint_path *tracepoint_id_to_path(u64 config)
 162 {
 163         struct tracepoint_path *path = NULL;
 164         DIR *sys_dir, *evt_dir;
 165         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
 166         char id_buf[4];
 167         int sys_dir_fd, fd;
 168         u64 id;
 169         char evt_path[MAXPATHLEN];
 170
 171         if (valid_debugfs_mount(debugfs_path))
 172                 return NULL;
 173
 174         sys_dir = opendir(debugfs_path);
 175         if (!sys_dir)
 176                 goto cleanup;
 177         sys_dir_fd = dirfd(sys_dir);
 178
 179         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
 180                 int dfd = openat(sys_dir_fd, sys_dirent.d_name,
 181                                  O_RDONLY|O_DIRECTORY), evt_dir_fd;
 182                 if (dfd == -1)
 183                         continue;
 184                 evt_dir = fdopendir(dfd);
 185                 if (!evt_dir) {
 186                         close(dfd);
 187                         continue;
 188                 }
 189                 evt_dir_fd = dirfd(evt_dir);
 190                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
 191                         snprintf(evt_path, MAXPATHLEN, "%s/id",
 192                                  evt_dirent.d_name);
 193                         fd = openat(evt_dir_fd, evt_path, O_RDONLY);
 194                         if (fd < 0)
 195                                 continue;
 196                         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
 197                                 close(fd);
 198                                 continue;
 199                         }
 200                         close(fd);
 201                         id = atoll(id_buf);
 202                         if (id == config) {
 203                                 closedir(evt_dir);
 204                                 closedir(sys_dir);
 205                                 path = calloc(1, sizeof(path));
 206                                 path->system = malloc(MAX_EVENT_LENGTH);
 207                                 if (!path->system) {
 208                                         free(path);
 209                                         return NULL;
 210                                 }
 211                                 path->name = malloc(MAX_EVENT_LENGTH);
 212                                 if (!path->name) {
 213                                         free(path->system);
 214                                         free(path);
 215                                         return NULL;
 216                                 }
 217                                 strncpy(path->system, sys_dirent.d_name,
 218                                         MAX_EVENT_LENGTH);
 219                                 strncpy(path->name, evt_dirent.d_name,
 220                                         MAX_EVENT_LENGTH);
 221                                 return path;
 222                         }
 223                 }
 224                 closedir(evt_dir);
 225         }
 226
 227 cleanup:
 228         closedir(sys_dir);
 229         return NULL;
 230 }
 231
 232 #define TP_PATH_LEN (MAX_EVENT_LENGTH * 2 + 1)
 233 static const char *tracepoint_id_to_name(u64 config)
 234 {
 235         static char buf[TP_PATH_LEN];
 236         struct tracepoint_path *path;
 237
 238         path = tracepoint_id_to_path(config);
 239         if (path) {
 240                 snprintf(buf, TP_PATH_LEN, "%s:%s", path->system, path->name);
 241                 free(path->name);
 242                 free(path->system);
 243                 free(path);
 244         } else
 245                 snprintf(buf, TP_PATH_LEN, "%s:%s", "unknown", "unknown");
 246
 247         return buf;
 248 }
 249
 250 static int is_cache_op_valid(u8 cache_type, u8 cache_op)
 251 {
 252         if (hw_cache_stat[cache_type] & COP(cache_op))
 253                 return 1;       /* valid */
 254         else
 255                 return 0;       /* invalid */
 256 }
 257
 258 static char *event_cache_name(u8 cache_type, u8 cache_op, u8 cache_result)
 259 {
 260         static char name[50];
 261
 262         if (cache_result) {
 263                 sprintf(name, "%s-%s-%s", hw_cache[cache_type][0],
 264                         hw_cache_op[cache_op][0],
 265                         hw_cache_result[cache_result][0]);
 266         } else {
 267                 sprintf(name, "%s-%s", hw_cache[cache_type][0],
 268                         hw_cache_op[cache_op][1]);
 269         }
 270
 271         return name;
 272 }
 273
 274 const char *event_name(int counter)
 275 {
 276         u64 config = attrs[counter].config;
 277         int type = attrs[counter].type;
 278
 279         return __event_name(type, config);
 280 }
 281
 282 const char *__event_name(int type, u64 config)
 283 {
 284         static char buf[32];
 285
 286         if (type == PERF_TYPE_RAW) {
 287                 sprintf(buf, "raw 0x%llx", config);
 288                 return buf;
 289         }
 290
 291         switch (type) {
 292         case PERF_TYPE_HARDWARE:
 293                 if (config < PERF_COUNT_HW_MAX)
 294                         return hw_event_names[config];
 295                 return "unknown-hardware";
 296
 297         case PERF_TYPE_HW_CACHE: {
 298                 u8 cache_type, cache_op, cache_result;
 299
 300                 cache_type   = (config >>  0) & 0xff;
 301                 if (cache_type > PERF_COUNT_HW_CACHE_MAX)
 302                         return "unknown-ext-hardware-cache-type";
 303
 304                 cache_op     = (config >>  8) & 0xff;
 305                 if (cache_op > PERF_COUNT_HW_CACHE_OP_MAX)
 306                         return "unknown-ext-hardware-cache-op";
 307
 308                 cache_result = (config >> 16) & 0xff;
 309                 if (cache_result > PERF_COUNT_HW_CACHE_RESULT_MAX)
 310                         return "unknown-ext-hardware-cache-result";
 311
 312                 if (!is_cache_op_valid(cache_type, cache_op))
 313                         return "invalid-cache";
 314
 315                 return event_cache_name(cache_type, cache_op, cache_result);
 316         }
 317
 318         case PERF_TYPE_SOFTWARE:
 319                 if (config < PERF_COUNT_SW_MAX)
 320                         return sw_event_names[config];
 321                 return "unknown-software";
 322
 323         case PERF_TYPE_TRACEPOINT:
 324                 return tracepoint_id_to_name(config);
 325
 326         default:
 327                 break;
 328         }
 329
 330         return "unknown";
 331 }
 332
 333 static int parse_aliases(const char **str, const char *names[][MAX_ALIASES], int size)
 334 {
 335         int i, j;
 336         int n, longest = -1;
 337
 338         for (i = 0; i < size; i++) {
 339                 for (j = 0; j < MAX_ALIASES && names[i][j]; j++) {
 340                         n = strlen(names[i][j]);
 341                         if (n > longest && !strncasecmp(*str, names[i][j], n))
 342                                 longest = n;
 343                 }
 344                 if (longest > 0) {
 345                         *str += longest;
 346                         return i;
 347                 }
 348         }
 349
 350         return -1;
 351 }
 352
 353 static enum event_result
 354 parse_generic_hw_event(const char **str, struct perf_counter_attr *attr)
 355 {
 356         const char *s = *str;
 357         int cache_type = -1, cache_op = -1, cache_result = -1;
 358
 359         cache_type = parse_aliases(&s, hw_cache, PERF_COUNT_HW_CACHE_MAX);
 360         /*
 361          * No fallback - if we cannot get a clear cache type
 362          * then bail out:
 363          */
 364         if (cache_type == -1)
 365                 return EVT_FAILED;
 366
 367         while ((cache_op == -1 || cache_result == -1) && *s == '-') {
 368                 ++s;
 369
 370                 if (cache_op == -1) {
 371                         cache_op = parse_aliases(&s, hw_cache_op,
 372                                                 PERF_COUNT_HW_CACHE_OP_MAX);
 373                         if (cache_op >= 0) {
 374                                 if (!is_cache_op_valid(cache_type, cache_op))
 375                                         return 0;
 376                                 continue;
 377                         }
 378                 }
 379
 380                 if (cache_result == -1) {
 381                         cache_result = parse_aliases(&s, hw_cache_result,
 382                                                 PERF_COUNT_HW_CACHE_RESULT_MAX);
 383                         if (cache_result >= 0)
 384                                 continue;
 385                 }
 386
 387                 /*
 388                  * Can't parse this as a cache op or result, so back up
 389                  * to the '-'.
 390                  */
 391                 --s;
 392                 break;
 393         }
 394
 395         /*
 396          * Fall back to reads:
 397          */
 398         if (cache_op == -1)
 399                 cache_op = PERF_COUNT_HW_CACHE_OP_READ;
 400
 401         /*
 402          * Fall back to accesses:
 403          */
 404         if (cache_result == -1)
 405                 cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;
 406
 407         attr->config = cache_type | (cache_op << 8) | (cache_result << 16);
 408         attr->type = PERF_TYPE_HW_CACHE;
 409
 410         *str = s;
 411         return EVT_HANDLED;
 412 }
 413
 414 static enum event_result
 415 parse_single_tracepoint_event(char *sys_name,
 416                               const char *evt_name,
 417                               unsigned int evt_length,
 418                               char *flags,
 419                               struct perf_counter_attr *attr,
 420                               const char **strp)
 421 {
 422         char evt_path[MAXPATHLEN];
 423         char id_buf[4];
 424         u64 id;
 425         int fd;
 426
 427         if (flags) {
 428                 if (!strncmp(flags, "record", strlen(flags))) {
 429                         attr->sample_type |= PERF_SAMPLE_RAW;
 430                         attr->sample_type |= PERF_SAMPLE_TIME;
 431                         attr->sample_type |= PERF_SAMPLE_CPU;
 432                 }
 433         }
 434
 435         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
 436                  sys_name, evt_name);
 437
 438         fd = open(evt_path, O_RDONLY);
 439         if (fd < 0)
 440                 return EVT_FAILED;
 441
 442         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
 443                 close(fd);
 444                 return EVT_FAILED;
 445         }
 446
 447         close(fd);
 448         id = atoll(id_buf);
 449         attr->config = id;
 450         attr->type = PERF_TYPE_TRACEPOINT;
 451         *strp = evt_name + evt_length;
 452
 453         return EVT_HANDLED;
 454 }
 455
 456 /* sys + ':' + event + ':' + flags*/
 457 #define MAX_EVOPT_LEN   (MAX_EVENT_LENGTH * 2 + 2 + 128)
 458 static enum event_result
 459 parse_subsystem_tracepoint_event(char *sys_name, char *flags)
 460 {
 461         char evt_path[MAXPATHLEN];
 462         struct dirent *evt_ent;
 463         DIR *evt_dir;
 464
 465         snprintf(evt_path, MAXPATHLEN, "%s/%s", debugfs_path, sys_name);
 466         evt_dir = opendir(evt_path);
 467
 468         if (!evt_dir) {
 469                 perror("Can't open event dir");
 470                 return EVT_FAILED;
 471         }
 472
 473         while ((evt_ent = readdir(evt_dir))) {
 474                 char event_opt[MAX_EVOPT_LEN + 1];
 475                 int len;
 476                 unsigned int rem = MAX_EVOPT_LEN;
 477
 478                 if (!strcmp(evt_ent->d_name, ".")
 479                     || !strcmp(evt_ent->d_name, "..")
 480                     || !strcmp(evt_ent->d_name, "enable")
 481                     || !strcmp(evt_ent->d_name, "filter"))
 482                         continue;
 483
 484                 len = snprintf(event_opt, MAX_EVOPT_LEN, "%s:%s", sys_name,
 485                                evt_ent->d_name);
 486                 if (len < 0)
 487                         return EVT_FAILED;
 488
 489                 rem -= len;
 490                 if (flags) {
 491                         if (rem < strlen(flags) + 1)
 492                                 return EVT_FAILED;
 493
 494                         strcat(event_opt, ":");
 495                         strcat(event_opt, flags);
 496                 }
 497
 498                 if (parse_events(NULL, event_opt, 0))
 499                         return EVT_FAILED;
 500         }
 501
 502         return EVT_HANDLED_ALL;
 503 }
 504
 505
 506 static enum event_result parse_tracepoint_event(const char **strp,
 507                                     struct perf_counter_attr *attr)
 508 {
 509         const char *evt_name;
 510         char *flags;
 511         char sys_name[MAX_EVENT_LENGTH];
 512         unsigned int sys_length, evt_length;
 513
 514         if (valid_debugfs_mount(debugfs_path))
 515                 return 0;
 516
 517         evt_name = strchr(*strp, ':');
 518         if (!evt_name)
 519                 return EVT_FAILED;
 520
 521         sys_length = evt_name - *strp;
 522         if (sys_length >= MAX_EVENT_LENGTH)
 523                 return 0;
 524
 525         strncpy(sys_name, *strp, sys_length);
 526         sys_name[sys_length] = '\0';
 527         evt_name = evt_name + 1;
 528
 529         flags = strchr(evt_name, ':');
 530         if (flags) {
 531                 /* split it out: */
 532                 evt_name = strndup(evt_name, flags - evt_name);
 533                 flags++;
 534         }
 535
 536         evt_length = strlen(evt_name);
 537         if (evt_length >= MAX_EVENT_LENGTH)
 538                 return EVT_FAILED;
 539
 540         if (!strcmp(evt_name, "*")) {
 541                 *strp = evt_name + evt_length;
 542                 return parse_subsystem_tracepoint_event(sys_name, flags);
 543         } else
 544                 return parse_single_tracepoint_event(sys_name, evt_name,
 545                                                      evt_length, flags,
 546                                                      attr, strp);
 547 }
 548
 549 static int check_events(const char *str, unsigned int i)
 550 {
 551         int n;
 552
 553         n = strlen(event_symbols[i].symbol);
 554         if (!strncmp(str, event_symbols[i].symbol, n))
 555                 return n;
 556
 557         n = strlen(event_symbols[i].alias);
 558         if (n)
 559                 if (!strncmp(str, event_symbols[i].alias, n))
 560                         return n;
 561         return 0;
 562 }
 563
 564 static enum event_result
 565 parse_symbolic_event(const char **strp, struct perf_counter_attr *attr)
 566 {
 567         const char *str = *strp;
 568         unsigned int i;
 569         int n;
 570
 571         for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
 572                 n = check_events(str, i);
 573                 if (n > 0) {
 574                         attr->type = event_symbols[i].type;
 575                         attr->config = event_symbols[i].config;
 576                         *strp = str + n;
 577                         return EVT_HANDLED;
 578                 }
 579         }
 580         return EVT_FAILED;
 581 }
 582
 583 static enum event_result
 584 parse_raw_event(const char **strp, struct perf_counter_attr *attr)
 585 {
 586         const char *str = *strp;
 587         u64 config;
 588         int n;
 589
 590         if (*str != 'r')
 591                 return EVT_FAILED;
 592         n = hex2u64(str + 1, &config);
 593         if (n > 0) {
 594                 *strp = str + n + 1;
 595                 attr->type = PERF_TYPE_RAW;
 596                 attr->config = config;
 597                 return EVT_HANDLED;
 598         }
 599         return EVT_FAILED;
 600 }
 601
 602 static enum event_result
 603 parse_numeric_event(const char **strp, struct perf_counter_attr *attr)
 604 {
 605         const char *str = *strp;
 606         char *endp;
 607         unsigned long type;
 608         u64 config;
 609
 610         type = strtoul(str, &endp, 0);
 611         if (endp > str && type < PERF_TYPE_MAX && *endp == ':') {
 612                 str = endp + 1;
 613                 config = strtoul(str, &endp, 0);
 614                 if (endp > str) {
 615                         attr->type = type;
 616                         attr->config = config;
 617                         *strp = endp;
 618                         return EVT_HANDLED;
 619                 }
 620         }
 621         return EVT_FAILED;
 622 }
 623
 624 static enum event_result
 625 parse_event_modifier(const char **strp, struct perf_counter_attr *attr)
 626 {
 627         const char *str = *strp;
 628         int eu = 1, ek = 1, eh = 1;
 629
 630         if (*str++ != ':')
 631                 return 0;
 632         while (*str) {
 633                 if (*str == 'u')
 634                         eu = 0;
 635                 else if (*str == 'k')
 636                         ek = 0;
 637                 else if (*str == 'h')
 638                         eh = 0;
 639                 else
 640                         break;
 641                 ++str;
 642         }
 643         if (str >= *strp + 2) {
 644                 *strp = str;
 645                 attr->exclude_user   = eu;
 646                 attr->exclude_kernel = ek;
 647                 attr->exclude_hv     = eh;
 648                 return 1;
 649         }
 650         return 0;
 651 }
 652
 653 /*
 654  * Each event can have multiple symbolic names.
 655  * Symbolic names are (almost) exactly matched.
 656  */
 657 static enum event_result
 658 parse_event_symbols(const char **str, struct perf_counter_attr *attr)
 659 {
 660         enum event_result ret;
 661
 662         ret = parse_tracepoint_event(str, attr);
 663         if (ret != EVT_FAILED)
 664                 goto modifier;
 665
 666         ret = parse_raw_event(str, attr);
 667         if (ret != EVT_FAILED)
 668                 goto modifier;
 669
 670         ret = parse_numeric_event(str, attr);
 671         if (ret != EVT_FAILED)
 672                 goto modifier;
 673
 674         ret = parse_symbolic_event(str, attr);
 675         if (ret != EVT_FAILED)
 676                 goto modifier;
 677
 678         ret = parse_generic_hw_event(str, attr);
 679         if (ret != EVT_FAILED)
 680                 goto modifier;
 681
 682         return EVT_FAILED;
 683
 684 modifier:
 685         parse_event_modifier(str, attr);
 686
 687         return ret;
 688 }
 689
 690 int parse_events(const struct option *opt __used, const char *str, int unset __used)
 691 {
 692         struct perf_counter_attr attr;
 693         enum event_result ret;
 694
 695         for (;;) {
 696                 if (nr_counters == MAX_COUNTERS)
 697                         return -1;
 698
 699                 memset(&attr, 0, sizeof(attr));
 700                 ret = parse_event_symbols(&str, &attr);
 701                 if (ret == EVT_FAILED)
 702                         return -1;
 703
 704                 if (!(*str == 0 || *str == ',' || isspace(*str)))
 705                         return -1;
 706
 707                 if (ret != EVT_HANDLED_ALL) {
 708                         attrs[nr_counters] = attr;
 709                         nr_counters++;
 710                 }
 711
 712                 if (*str == 0)
 713                         break;
 714                 if (*str == ',')
 715                         ++str;
 716                 while (isspace(*str))
 717                         ++str;
 718         }
 719
 720         return 0;
 721 }
 722
 723 static const char * const event_type_descriptors[] = {
 724         "",
 725         "Hardware event",
 726         "Software event",
 727         "Tracepoint event",
 728         "Hardware cache event",
 729 };
 730
 731 /*
 732  * Print the events from <debugfs_mount_point>/tracing/events
 733  */
 734
 735 static void print_tracepoint_events(void)
 736 {
 737         DIR *sys_dir, *evt_dir;
 738         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
 739         int sys_dir_fd;
 740         char evt_path[MAXPATHLEN];
 741
 742         if (valid_debugfs_mount(debugfs_path))
 743                 return;
 744
 745         sys_dir = opendir(debugfs_path);
 746         if (!sys_dir)
 747                 goto cleanup;
 748         sys_dir_fd = dirfd(sys_dir);
 749
 750         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
 751                 int dfd = openat(sys_dir_fd, sys_dirent.d_name,
 752                                  O_RDONLY|O_DIRECTORY), evt_dir_fd;
 753                 if (dfd == -1)
 754                         continue;
 755                 evt_dir = fdopendir(dfd);
 756                 if (!evt_dir) {
 757                         close(dfd);
 758                         continue;
 759                 }
 760                 evt_dir_fd = dirfd(evt_dir);
 761                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
 762                         snprintf(evt_path, MAXPATHLEN, "%s:%s",
 763                                  sys_dirent.d_name, evt_dirent.d_name);
 764                         fprintf(stderr, "  %-42s [%s]\n", evt_path,
 765                                 event_type_descriptors[PERF_TYPE_TRACEPOINT+1]);
 766                 }
 767                 closedir(evt_dir);
 768         }
 769
 770 cleanup:
 771         closedir(sys_dir);
 772 }
 773
 774 /*
 775  * Print the help text for the event symbols:
 776  */
 777 void print_events(void)
 778 {
 779         struct event_symbol *syms = event_symbols;
 780         unsigned int i, type, op, prev_type = -1;
 781         char name[40];
 782
 783         fprintf(stderr, "\n");
 784         fprintf(stderr, "List of pre-defined events (to be used in -e):\n");
 785
 786         for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
 787                 type = syms->type + 1;
 788                 if (type >= ARRAY_SIZE(event_type_descriptors))
 789                         type = 0;
 790
 791                 if (type != prev_type)
 792                         fprintf(stderr, "\n");
 793
 794                 if (strlen(syms->alias))
 795                         sprintf(name, "%s OR %s", syms->symbol, syms->alias);
 796                 else
 797                         strcpy(name, syms->symbol);
 798                 fprintf(stderr, "  %-42s [%s]\n", name,
 799                         event_type_descriptors[type]);
 800
 801                 prev_type = type;
 802         }
 803
 804         fprintf(stderr, "\n");
 805         for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
 806                 for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
 807                         /* skip invalid cache type */
 808                         if (!is_cache_op_valid(type, op))
 809                                 continue;
 810
 811                         for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
 812                                 fprintf(stderr, "  %-42s [%s]\n",
 813                                         event_cache_name(type, op, i),
 814                                         event_type_descriptors[4]);
 815                         }
 816                 }
 817         }
 818
 819         fprintf(stderr, "\n");
 820         fprintf(stderr, "  %-42s [raw hardware event descriptor]\n",
 821                 "rNNN");
 822         fprintf(stderr, "\n");
 823
 824         print_tracepoint_events();
 825
 826         exit(129);
 827 }