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 #include "header.h"
  10
  11 int                                     nr_counters;
  12
  13 struct perf_event_attr          attrs[MAX_COUNTERS];
  14
  15 struct event_symbol {
  16         u8              type;
  17         u64             config;
  18         const char      *symbol;
  19         const char      *alias;
  20 };
  21
  22 enum event_result {
  23         EVT_FAILED,
  24         EVT_HANDLED,
  25         EVT_HANDLED_ALL
  26 };
  27
  28 char debugfs_path[MAXPATHLEN];
  29
  30 #define CHW(x) .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_##x
  31 #define CSW(x) .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_##x
  32
  33 static struct event_symbol event_symbols[] = {
  34   { CHW(CPU_CYCLES),            "cpu-cycles",           "cycles"        },
  35   { CHW(INSTRUCTIONS),          "instructions",         ""              },
  36   { CHW(CACHE_REFERENCES),      "cache-references",     ""              },
  37   { CHW(CACHE_MISSES),          "cache-misses",         ""              },
  38   { CHW(BRANCH_INSTRUCTIONS),   "branch-instructions",  "branches"      },
  39   { CHW(BRANCH_MISSES),         "branch-misses",        ""              },
  40   { CHW(BUS_CYCLES),            "bus-cycles",           ""              },
  41
  42   { CSW(CPU_CLOCK),             "cpu-clock",            ""              },
  43   { CSW(TASK_CLOCK),            "task-clock",           ""              },
  44   { CSW(PAGE_FAULTS),           "page-faults",          "faults"        },
  45   { CSW(PAGE_FAULTS_MIN),       "minor-faults",         ""              },
  46   { CSW(PAGE_FAULTS_MAJ),       "major-faults",         ""              },
  47   { CSW(CONTEXT_SWITCHES),      "context-switches",     "cs"            },
  48   { CSW(CPU_MIGRATIONS),        "cpu-migrations",       "migrations"    },
  49 };
  50
  51 #define __PERF_EVENT_FIELD(config, name) \
  52         ((config & PERF_EVENT_##name##_MASK) >> PERF_EVENT_##name##_SHIFT)
  53
  54 #define PERF_EVENT_RAW(config)  __PERF_EVENT_FIELD(config, RAW)
  55 #define PERF_EVENT_CONFIG(config)       __PERF_EVENT_FIELD(config, CONFIG)
  56 #define PERF_EVENT_TYPE(config) __PERF_EVENT_FIELD(config, TYPE)
  57 #define PERF_EVENT_ID(config)           __PERF_EVENT_FIELD(config, EVENT)
  58
  59 static const char *hw_event_names[] = {
  60         "cycles",
  61         "instructions",
  62         "cache-references",
  63         "cache-misses",
  64         "branches",
  65         "branch-misses",
  66         "bus-cycles",
  67 };
  68
  69 static const char *sw_event_names[] = {
  70         "cpu-clock-msecs",
  71         "task-clock-msecs",
  72         "page-faults",
  73         "context-switches",
  74         "CPU-migrations",
  75         "minor-faults",
  76         "major-faults",
  77 };
  78
  79 #define MAX_ALIASES 8
  80
  81 static const char *hw_cache[][MAX_ALIASES] = {
  82  { "L1-dcache", "l1-d",         "l1d",          "L1-data",              },
  83  { "L1-icache", "l1-i",         "l1i",          "L1-instruction",       },
  84  { "LLC",       "L2"                                                    },
  85  { "dTLB",      "d-tlb",        "Data-TLB",                             },
  86  { "iTLB",      "i-tlb",        "Instruction-TLB",                      },
  87  { "branch",    "branches",     "bpu",          "btb",          "bpc",  },
  88 };
  89
  90 static const char *hw_cache_op[][MAX_ALIASES] = {
  91  { "load",      "loads",        "read",                                 },
  92  { "store",     "stores",       "write",                                },
  93  { "prefetch",  "prefetches",   "speculative-read", "speculative-load", },
  94 };
  95
  96 static const char *hw_cache_result[][MAX_ALIASES] = {
  97  { "refs",      "Reference",    "ops",          "access",               },
  98  { "misses",    "miss",                                                 },
  99 };
 100
 101 #define C(x)            PERF_COUNT_HW_CACHE_##x
 102 #define CACHE_READ      (1 << C(OP_READ))
 103 #define CACHE_WRITE     (1 << C(OP_WRITE))
 104 #define CACHE_PREFETCH  (1 << C(OP_PREFETCH))
 105 #define COP(x)          (1 << x)
 106
 107 /*
 108  * cache operartion stat
 109  * L1I : Read and prefetch only
 110  * ITLB and BPU : Read-only
 111  */
 112 static unsigned long hw_cache_stat[C(MAX)] = {
 113  [C(L1D)]       = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 114  [C(L1I)]       = (CACHE_READ | CACHE_PREFETCH),
 115  [C(LL)]        = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 116  [C(DTLB)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 117  [C(ITLB)]      = (CACHE_READ),
 118  [C(BPU)]       = (CACHE_READ),
 119 };
 120
 121 #define for_each_subsystem(sys_dir, sys_dirent, sys_next)              \
 122         while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next)        \
 123         if (sys_dirent.d_type == DT_DIR &&                                     \
 124            (strcmp(sys_dirent.d_name, ".")) &&                                 \
 125            (strcmp(sys_dirent.d_name, "..")))
 126
 127 static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
 128 {
 129         char evt_path[MAXPATHLEN];
 130         int fd;
 131
 132         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
 133                         sys_dir->d_name, evt_dir->d_name);
 134         fd = open(evt_path, O_RDONLY);
 135         if (fd < 0)
 136                 return -EINVAL;
 137         close(fd);
 138
 139         return 0;
 140 }
 141
 142 #define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next)              \
 143         while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next)        \
 144         if (evt_dirent.d_type == DT_DIR &&                                     \
 145            (strcmp(evt_dirent.d_name, ".")) &&                                 \
 146            (strcmp(evt_dirent.d_name, "..")) &&                                \
 147            (!tp_event_has_id(&sys_dirent, &evt_dirent)))
 148
 149 #define MAX_EVENT_LENGTH 512
 150
 151 int valid_debugfs_mount(const char *debugfs)
 152 {
 153         struct statfs st_fs;
 154
 155         if (statfs(debugfs, &st_fs) < 0)
 156                 return -ENOENT;
 157         else if (st_fs.f_type != (long) DEBUGFS_MAGIC)
 158                 return -ENOENT;
 159         return 0;
 160 }
 161
 162 struct tracepoint_path *tracepoint_id_to_path(u64 config)
 163 {
 164         struct tracepoint_path *path = NULL;
 165         DIR *sys_dir, *evt_dir;
 166         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
 167         char id_buf[4];
 168         int fd;
 169         u64 id;
 170         char evt_path[MAXPATHLEN];
 171         char dir_path[MAXPATHLEN];
 172
 173         if (valid_debugfs_mount(debugfs_path))
 174                 return NULL;
 175
 176         sys_dir = opendir(debugfs_path);
 177         if (!sys_dir)
 178                 return NULL;
 179
 180         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
 181
 182                 snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
 183                          sys_dirent.d_name);
 184                 evt_dir = opendir(dir_path);
 185                 if (!evt_dir)
 186                         continue;
 187
 188                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
 189
 190                         snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
 191                                  evt_dirent.d_name);
 192                         fd = open(evt_path, O_RDONLY);
 193                         if (fd < 0)
 194                                 continue;
 195                         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
 196                                 close(fd);
 197                                 continue;
 198                         }
 199                         close(fd);
 200                         id = atoll(id_buf);
 201                         if (id == config) {
 202                                 closedir(evt_dir);
 203                                 closedir(sys_dir);
 204                                 path = calloc(1, sizeof(path));
 205                                 path->system = malloc(MAX_EVENT_LENGTH);
 206                                 if (!path->system) {
 207                                         free(path);
 208                                         return NULL;
 209                                 }
 210                                 path->name = malloc(MAX_EVENT_LENGTH);
 211                                 if (!path->name) {
 212                                         free(path->system);
 213                                         free(path);
 214                                         return NULL;
 215                                 }
 216                                 strncpy(path->system, sys_dirent.d_name,
 217                                         MAX_EVENT_LENGTH);
 218                                 strncpy(path->name, evt_dirent.d_name,
 219                                         MAX_EVENT_LENGTH);
 220                                 return path;
 221                         }
 222                 }
 223                 closedir(evt_dir);
 224         }
 225
 226         closedir(sys_dir);
 227         return NULL;
 228 }
 229
 230 #define TP_PATH_LEN (MAX_EVENT_LENGTH * 2 + 1)
 231 static const char *tracepoint_id_to_name(u64 config)
 232 {
 233         static char buf[TP_PATH_LEN];
 234         struct tracepoint_path *path;
 235
 236         path = tracepoint_id_to_path(config);
 237         if (path) {
 238                 snprintf(buf, TP_PATH_LEN, "%s:%s", path->system, path->name);
 239                 free(path->name);
 240                 free(path->system);
 241                 free(path);
 242         } else
 243                 snprintf(buf, TP_PATH_LEN, "%s:%s", "unknown", "unknown");
 244
 245         return buf;
 246 }
 247
 248 static int is_cache_op_valid(u8 cache_type, u8 cache_op)
 249 {
 250         if (hw_cache_stat[cache_type] & COP(cache_op))
 251                 return 1;       /* valid */
 252         else
 253                 return 0;       /* invalid */
 254 }
 255
 256 static char *event_cache_name(u8 cache_type, u8 cache_op, u8 cache_result)
 257 {
 258         static char name[50];
 259
 260         if (cache_result) {
 261                 sprintf(name, "%s-%s-%s", hw_cache[cache_type][0],
 262                         hw_cache_op[cache_op][0],
 263                         hw_cache_result[cache_result][0]);
 264         } else {
 265                 sprintf(name, "%s-%s", hw_cache[cache_type][0],
 266                         hw_cache_op[cache_op][1]);
 267         }
 268
 269         return name;
 270 }
 271
 272 const char *event_name(int counter)
 273 {
 274         u64 config = attrs[counter].config;
 275         int type = attrs[counter].type;
 276
 277         return __event_name(type, config);
 278 }
 279
 280 const char *__event_name(int type, u64 config)
 281 {
 282         static char buf[32];
 283
 284         if (type == PERF_TYPE_RAW) {
 285                 sprintf(buf, "raw 0x%llx", config);
 286                 return buf;
 287         }
 288
 289         switch (type) {
 290         case PERF_TYPE_HARDWARE:
 291                 if (config < PERF_COUNT_HW_MAX)
 292                         return hw_event_names[config];
 293                 return "unknown-hardware";
 294
 295         case PERF_TYPE_HW_CACHE: {
 296                 u8 cache_type, cache_op, cache_result;
 297
 298                 cache_type   = (config >>  0) & 0xff;
 299                 if (cache_type > PERF_COUNT_HW_CACHE_MAX)
 300                         return "unknown-ext-hardware-cache-type";
 301
 302                 cache_op     = (config >>  8) & 0xff;
 303                 if (cache_op > PERF_COUNT_HW_CACHE_OP_MAX)
 304                         return "unknown-ext-hardware-cache-op";
 305
 306                 cache_result = (config >> 16) & 0xff;
 307                 if (cache_result > PERF_COUNT_HW_CACHE_RESULT_MAX)
 308                         return "unknown-ext-hardware-cache-result";
 309
 310                 if (!is_cache_op_valid(cache_type, cache_op))
 311                         return "invalid-cache";
 312
 313                 return event_cache_name(cache_type, cache_op, cache_result);
 314         }
 315
 316         case PERF_TYPE_SOFTWARE:
 317                 if (config < PERF_COUNT_SW_MAX)
 318                         return sw_event_names[config];
 319                 return "unknown-software";
 320
 321         case PERF_TYPE_TRACEPOINT:
 322                 return tracepoint_id_to_name(config);
 323
 324         default:
 325                 break;
 326         }
 327
 328         return "unknown";
 329 }
 330
 331 static int parse_aliases(const char **str, const char *names[][MAX_ALIASES], int size)
 332 {
 333         int i, j;
 334         int n, longest = -1;
 335
 336         for (i = 0; i < size; i++) {
 337                 for (j = 0; j < MAX_ALIASES && names[i][j]; j++) {
 338                         n = strlen(names[i][j]);
 339                         if (n > longest && !strncasecmp(*str, names[i][j], n))
 340                                 longest = n;
 341                 }
 342                 if (longest > 0) {
 343                         *str += longest;
 344                         return i;
 345                 }
 346         }
 347
 348         return -1;
 349 }
 350
 351 static enum event_result
 352 parse_generic_hw_event(const char **str, struct perf_event_attr *attr)
 353 {
 354         const char *s = *str;
 355         int cache_type = -1, cache_op = -1, cache_result = -1;
 356
 357         cache_type = parse_aliases(&s, hw_cache, PERF_COUNT_HW_CACHE_MAX);
 358         /*
 359          * No fallback - if we cannot get a clear cache type
 360          * then bail out:
 361          */
 362         if (cache_type == -1)
 363                 return EVT_FAILED;
 364
 365         while ((cache_op == -1 || cache_result == -1) && *s == '-') {
 366                 ++s;
 367
 368                 if (cache_op == -1) {
 369                         cache_op = parse_aliases(&s, hw_cache_op,
 370                                                 PERF_COUNT_HW_CACHE_OP_MAX);
 371                         if (cache_op >= 0) {
 372                                 if (!is_cache_op_valid(cache_type, cache_op))
 373                                         return 0;
 374                                 continue;
 375                         }
 376                 }
 377
 378                 if (cache_result == -1) {
 379                         cache_result = parse_aliases(&s, hw_cache_result,
 380                                                 PERF_COUNT_HW_CACHE_RESULT_MAX);
 381                         if (cache_result >= 0)
 382                                 continue;
 383                 }
 384
 385                 /*
 386                  * Can't parse this as a cache op or result, so back up
 387                  * to the '-'.
 388                  */
 389                 --s;
 390                 break;
 391         }
 392
 393         /*
 394          * Fall back to reads:
 395          */
 396         if (cache_op == -1)
 397                 cache_op = PERF_COUNT_HW_CACHE_OP_READ;
 398
 399         /*
 400          * Fall back to accesses:
 401          */
 402         if (cache_result == -1)
 403                 cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;
 404
 405         attr->config = cache_type | (cache_op << 8) | (cache_result << 16);
 406         attr->type = PERF_TYPE_HW_CACHE;
 407
 408         *str = s;
 409         return EVT_HANDLED;
 410 }
 411
 412 static enum event_result
 413 parse_single_tracepoint_event(char *sys_name,
 414                               const char *evt_name,
 415                               unsigned int evt_length,
 416                               char *flags,
 417                               struct perf_event_attr *attr,
 418                               const char **strp)
 419 {
 420         char evt_path[MAXPATHLEN];
 421         char id_buf[4];
 422         u64 id;
 423         int fd;
 424
 425         if (flags) {
 426                 if (!strncmp(flags, "record", strlen(flags))) {
 427                         attr->sample_type |= PERF_SAMPLE_RAW;
 428                         attr->sample_type |= PERF_SAMPLE_TIME;
 429                         attr->sample_type |= PERF_SAMPLE_CPU;
 430                 }
 431         }
 432
 433         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
 434                  sys_name, evt_name);
 435
 436         fd = open(evt_path, O_RDONLY);
 437         if (fd < 0)
 438                 return EVT_FAILED;
 439
 440         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
 441                 close(fd);
 442                 return EVT_FAILED;
 443         }
 444
 445         close(fd);
 446         id = atoll(id_buf);
 447         attr->config = id;
 448         attr->type = PERF_TYPE_TRACEPOINT;
 449         *strp = evt_name + evt_length;
 450
 451         return EVT_HANDLED;
 452 }
 453
 454 /* sys + ':' + event + ':' + flags*/
 455 #define MAX_EVOPT_LEN   (MAX_EVENT_LENGTH * 2 + 2 + 128)
 456 static enum event_result
 457 parse_subsystem_tracepoint_event(char *sys_name, char *flags)
 458 {
 459         char evt_path[MAXPATHLEN];
 460         struct dirent *evt_ent;
 461         DIR *evt_dir;
 462
 463         snprintf(evt_path, MAXPATHLEN, "%s/%s", debugfs_path, sys_name);
 464         evt_dir = opendir(evt_path);
 465
 466         if (!evt_dir) {
 467                 perror("Can't open event dir");
 468                 return EVT_FAILED;
 469         }
 470
 471         while ((evt_ent = readdir(evt_dir))) {
 472                 char event_opt[MAX_EVOPT_LEN + 1];
 473                 int len;
 474                 unsigned int rem = MAX_EVOPT_LEN;
 475
 476                 if (!strcmp(evt_ent->d_name, ".")
 477                     || !strcmp(evt_ent->d_name, "..")
 478                     || !strcmp(evt_ent->d_name, "enable")
 479                     || !strcmp(evt_ent->d_name, "filter"))
 480                         continue;
 481
 482                 len = snprintf(event_opt, MAX_EVOPT_LEN, "%s:%s", sys_name,
 483                                evt_ent->d_name);
 484                 if (len < 0)
 485                         return EVT_FAILED;
 486
 487                 rem -= len;
 488                 if (flags) {
 489                         if (rem < strlen(flags) + 1)
 490                                 return EVT_FAILED;
 491
 492                         strcat(event_opt, ":");
 493                         strcat(event_opt, flags);
 494                 }
 495
 496                 if (parse_events(NULL, event_opt, 0))
 497                         return EVT_FAILED;
 498         }
 499
 500         return EVT_HANDLED_ALL;
 501 }
 502
 503
 504 static enum event_result parse_tracepoint_event(const char **strp,
 505                                     struct perf_event_attr *attr)
 506 {
 507         const char *evt_name;
 508         char *flags;
 509         char sys_name[MAX_EVENT_LENGTH];
 510         unsigned int sys_length, evt_length;
 511
 512         if (valid_debugfs_mount(debugfs_path))
 513                 return 0;
 514
 515         evt_name = strchr(*strp, ':');
 516         if (!evt_name)
 517                 return EVT_FAILED;
 518
 519         sys_length = evt_name - *strp;
 520         if (sys_length >= MAX_EVENT_LENGTH)
 521                 return 0;
 522
 523         strncpy(sys_name, *strp, sys_length);
 524         sys_name[sys_length] = '\0';
 525         evt_name = evt_name + 1;
 526
 527         flags = strchr(evt_name, ':');
 528         if (flags) {
 529                 /* split it out: */
 530                 evt_name = strndup(evt_name, flags - evt_name);
 531                 flags++;
 532         }
 533
 534         evt_length = strlen(evt_name);
 535         if (evt_length >= MAX_EVENT_LENGTH)
 536                 return EVT_FAILED;
 537
 538         if (!strcmp(evt_name, "*")) {
 539                 *strp = evt_name + evt_length;
 540                 return parse_subsystem_tracepoint_event(sys_name, flags);
 541         } else
 542                 return parse_single_tracepoint_event(sys_name, evt_name,
 543                                                      evt_length, flags,
 544                                                      attr, strp);
 545 }
 546
 547 static int check_events(const char *str, unsigned int i)
 548 {
 549         int n;
 550
 551         n = strlen(event_symbols[i].symbol);
 552         if (!strncmp(str, event_symbols[i].symbol, n))
 553                 return n;
 554
 555         n = strlen(event_symbols[i].alias);
 556         if (n)
 557                 if (!strncmp(str, event_symbols[i].alias, n))
 558                         return n;
 559         return 0;
 560 }
 561
 562 static enum event_result
 563 parse_symbolic_event(const char **strp, struct perf_event_attr *attr)
 564 {
 565         const char *str = *strp;
 566         unsigned int i;
 567         int n;
 568
 569         for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
 570                 n = check_events(str, i);
 571                 if (n > 0) {
 572                         attr->type = event_symbols[i].type;
 573                         attr->config = event_symbols[i].config;
 574                         *strp = str + n;
 575                         return EVT_HANDLED;
 576                 }
 577         }
 578         return EVT_FAILED;
 579 }
 580
 581 static enum event_result
 582 parse_raw_event(const char **strp, struct perf_event_attr *attr)
 583 {
 584         const char *str = *strp;
 585         u64 config;
 586         int n;
 587
 588         if (*str != 'r')
 589                 return EVT_FAILED;
 590         n = hex2u64(str + 1, &config);
 591         if (n > 0) {
 592                 *strp = str + n + 1;
 593                 attr->type = PERF_TYPE_RAW;
 594                 attr->config = config;
 595                 return EVT_HANDLED;
 596         }
 597         return EVT_FAILED;
 598 }
 599
 600 static enum event_result
 601 parse_numeric_event(const char **strp, struct perf_event_attr *attr)
 602 {
 603         const char *str = *strp;
 604         char *endp;
 605         unsigned long type;
 606         u64 config;
 607
 608         type = strtoul(str, &endp, 0);
 609         if (endp > str && type < PERF_TYPE_MAX && *endp == ':') {
 610                 str = endp + 1;
 611                 config = strtoul(str, &endp, 0);
 612                 if (endp > str) {
 613                         attr->type = type;
 614                         attr->config = config;
 615                         *strp = endp;
 616                         return EVT_HANDLED;
 617                 }
 618         }
 619         return EVT_FAILED;
 620 }
 621
 622 static enum event_result
 623 parse_event_modifier(const char **strp, struct perf_event_attr *attr)
 624 {
 625         const char *str = *strp;
 626         int eu = 1, ek = 1, eh = 1;
 627
 628         if (*str++ != ':')
 629                 return 0;
 630         while (*str) {
 631                 if (*str == 'u')
 632                         eu = 0;
 633                 else if (*str == 'k')
 634                         ek = 0;
 635                 else if (*str == 'h')
 636                         eh = 0;
 637                 else
 638                         break;
 639                 ++str;
 640         }
 641         if (str >= *strp + 2) {
 642                 *strp = str;
 643                 attr->exclude_user   = eu;
 644                 attr->exclude_kernel = ek;
 645                 attr->exclude_hv     = eh;
 646                 return 1;
 647         }
 648         return 0;
 649 }
 650
 651 /*
 652  * Each event can have multiple symbolic names.
 653  * Symbolic names are (almost) exactly matched.
 654  */
 655 static enum event_result
 656 parse_event_symbols(const char **str, struct perf_event_attr *attr)
 657 {
 658         enum event_result ret;
 659
 660         ret = parse_tracepoint_event(str, attr);
 661         if (ret != EVT_FAILED)
 662                 goto modifier;
 663
 664         ret = parse_raw_event(str, attr);
 665         if (ret != EVT_FAILED)
 666                 goto modifier;
 667
 668         ret = parse_numeric_event(str, attr);
 669         if (ret != EVT_FAILED)
 670                 goto modifier;
 671
 672         ret = parse_symbolic_event(str, attr);
 673         if (ret != EVT_FAILED)
 674                 goto modifier;
 675
 676         ret = parse_generic_hw_event(str, attr);
 677         if (ret != EVT_FAILED)
 678                 goto modifier;
 679
 680         return EVT_FAILED;
 681
 682 modifier:
 683         parse_event_modifier(str, attr);
 684
 685         return ret;
 686 }
 687
 688 static void store_event_type(const char *orgname)
 689 {
 690         char filename[PATH_MAX], *c;
 691         FILE *file;
 692         int id;
 693
 694         sprintf(filename, "/sys/kernel/debug/tracing/events/%s/id", orgname);
 695         c = strchr(filename, ':');
 696         if (c)
 697                 *c = '/';
 698
 699         file = fopen(filename, "r");
 700         if (!file)
 701                 return;
 702         if (fscanf(file, "%i", &id) < 1)
 703                 die("cannot store event ID");
 704         fclose(file);
 705         perf_header__push_event(id, orgname);
 706 }
 707
 708
 709 int parse_events(const struct option *opt __used, const char *str, int unset __used)
 710 {
 711         struct perf_event_attr attr;
 712         enum event_result ret;
 713
 714         if (strchr(str, ':'))
 715                 store_event_type(str);
 716
 717         for (;;) {
 718                 if (nr_counters == MAX_COUNTERS)
 719                         return -1;
 720
 721                 memset(&attr, 0, sizeof(attr));
 722                 ret = parse_event_symbols(&str, &attr);
 723                 if (ret == EVT_FAILED)
 724                         return -1;
 725
 726                 if (!(*str == 0 || *str == ',' || isspace(*str)))
 727                         return -1;
 728
 729                 if (ret != EVT_HANDLED_ALL) {
 730                         attrs[nr_counters] = attr;
 731                         nr_counters++;
 732                 }
 733
 734                 if (*str == 0)
 735                         break;
 736                 if (*str == ',')
 737                         ++str;
 738                 while (isspace(*str))
 739                         ++str;
 740         }
 741
 742         return 0;
 743 }
 744
 745 static const char * const event_type_descriptors[] = {
 746         "",
 747         "Hardware event",
 748         "Software event",
 749         "Tracepoint event",
 750         "Hardware cache event",
 751 };
 752
 753 /*
 754  * Print the events from <debugfs_mount_point>/tracing/events
 755  */
 756
 757 static void print_tracepoint_events(void)
 758 {
 759         DIR *sys_dir, *evt_dir;
 760         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
 761         char evt_path[MAXPATHLEN];
 762         char dir_path[MAXPATHLEN];
 763
 764         if (valid_debugfs_mount(debugfs_path))
 765                 return;
 766
 767         sys_dir = opendir(debugfs_path);
 768         if (!sys_dir)
 769                 return;
 770
 771         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
 772
 773                 snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
 774                          sys_dirent.d_name);
 775                 evt_dir = opendir(dir_path);
 776                 if (!evt_dir)
 777                         continue;
 778
 779                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
 780                         snprintf(evt_path, MAXPATHLEN, "%s:%s",
 781                                  sys_dirent.d_name, evt_dirent.d_name);
 782                         fprintf(stderr, "  %-42s [%s]\n", evt_path,
 783                                 event_type_descriptors[PERF_TYPE_TRACEPOINT+1]);
 784                 }
 785                 closedir(evt_dir);
 786         }
 787         closedir(sys_dir);
 788 }
 789
 790 /*
 791  * Print the help text for the event symbols:
 792  */
 793 void print_events(void)
 794 {
 795         struct event_symbol *syms = event_symbols;
 796         unsigned int i, type, op, prev_type = -1;
 797         char name[40];
 798
 799         fprintf(stderr, "\n");
 800         fprintf(stderr, "List of pre-defined events (to be used in -e):\n");
 801
 802         for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
 803                 type = syms->type + 1;
 804                 if (type >= ARRAY_SIZE(event_type_descriptors))
 805                         type = 0;
 806
 807                 if (type != prev_type)
 808                         fprintf(stderr, "\n");
 809
 810                 if (strlen(syms->alias))
 811                         sprintf(name, "%s OR %s", syms->symbol, syms->alias);
 812                 else
 813                         strcpy(name, syms->symbol);
 814                 fprintf(stderr, "  %-42s [%s]\n", name,
 815                         event_type_descriptors[type]);
 816
 817                 prev_type = type;
 818         }
 819
 820         fprintf(stderr, "\n");
 821         for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
 822                 for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
 823                         /* skip invalid cache type */
 824                         if (!is_cache_op_valid(type, op))
 825                                 continue;
 826
 827                         for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
 828                                 fprintf(stderr, "  %-42s [%s]\n",
 829                                         event_cache_name(type, op, i),
 830                                         event_type_descriptors[4]);
 831                         }
 832                 }
 833         }
 834
 835         fprintf(stderr, "\n");
 836         fprintf(stderr, "  %-42s [raw hardware event descriptor]\n",
 837                 "rNNN");
 838         fprintf(stderr, "\n");
 839
 840         print_tracepoint_events();
 841
 842         exit(129);
 843 }