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 sys_dir_fd, fd;
 169         u64 id;
 170         char evt_path[MAXPATHLEN];
 171
 172         if (valid_debugfs_mount(debugfs_path))
 173                 return NULL;
 174
 175         sys_dir = opendir(debugfs_path);
 176         if (!sys_dir)
 177                 goto cleanup;
 178         sys_dir_fd = dirfd(sys_dir);
 179
 180         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
 181                 int dfd = openat(sys_dir_fd, sys_dirent.d_name,
 182                                  O_RDONLY|O_DIRECTORY), evt_dir_fd;
 183                 if (dfd == -1)
 184                         continue;
 185                 evt_dir = fdopendir(dfd);
 186                 if (!evt_dir) {
 187                         close(dfd);
 188                         continue;
 189                 }
 190                 evt_dir_fd = dirfd(evt_dir);
 191                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
 192                         snprintf(evt_path, MAXPATHLEN, "%s/id",
 193                                  evt_dirent.d_name);
 194                         fd = openat(evt_dir_fd, evt_path, O_RDONLY);
 195                         if (fd < 0)
 196                                 continue;
 197                         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
 198                                 close(fd);
 199                                 continue;
 200                         }
 201                         close(fd);
 202                         id = atoll(id_buf);
 203                         if (id == config) {
 204                                 closedir(evt_dir);
 205                                 closedir(sys_dir);
 206                                 path = calloc(1, sizeof(path));
 207                                 path->system = malloc(MAX_EVENT_LENGTH);
 208                                 if (!path->system) {
 209                                         free(path);
 210                                         return NULL;
 211                                 }
 212                                 path->name = malloc(MAX_EVENT_LENGTH);
 213                                 if (!path->name) {
 214                                         free(path->system);
 215                                         free(path);
 216                                         return NULL;
 217                                 }
 218                                 strncpy(path->system, sys_dirent.d_name,
 219                                         MAX_EVENT_LENGTH);
 220                                 strncpy(path->name, evt_dirent.d_name,
 221                                         MAX_EVENT_LENGTH);
 222                                 return path;
 223                         }
 224                 }
 225                 closedir(evt_dir);
 226         }
 227
 228 cleanup:
 229         closedir(sys_dir);
 230         return NULL;
 231 }
 232
 233 #define TP_PATH_LEN (MAX_EVENT_LENGTH * 2 + 1)
 234 static const char *tracepoint_id_to_name(u64 config)
 235 {
 236         static char buf[TP_PATH_LEN];
 237         struct tracepoint_path *path;
 238
 239         path = tracepoint_id_to_path(config);
 240         if (path) {
 241                 snprintf(buf, TP_PATH_LEN, "%s:%s", path->system, path->name);
 242                 free(path->name);
 243                 free(path->system);
 244                 free(path);
 245         } else
 246                 snprintf(buf, TP_PATH_LEN, "%s:%s", "unknown", "unknown");
 247
 248         return buf;
 249 }
 250
 251 static int is_cache_op_valid(u8 cache_type, u8 cache_op)
 252 {
 253         if (hw_cache_stat[cache_type] & COP(cache_op))
 254                 return 1;       /* valid */
 255         else
 256                 return 0;       /* invalid */
 257 }
 258
 259 static char *event_cache_name(u8 cache_type, u8 cache_op, u8 cache_result)
 260 {
 261         static char name[50];
 262
 263         if (cache_result) {
 264                 sprintf(name, "%s-%s-%s", hw_cache[cache_type][0],
 265                         hw_cache_op[cache_op][0],
 266                         hw_cache_result[cache_result][0]);
 267         } else {
 268                 sprintf(name, "%s-%s", hw_cache[cache_type][0],
 269                         hw_cache_op[cache_op][1]);
 270         }
 271
 272         return name;
 273 }
 274
 275 const char *event_name(int counter)
 276 {
 277         u64 config = attrs[counter].config;
 278         int type = attrs[counter].type;
 279
 280         return __event_name(type, config);
 281 }
 282
 283 const char *__event_name(int type, u64 config)
 284 {
 285         static char buf[32];
 286
 287         if (type == PERF_TYPE_RAW) {
 288                 sprintf(buf, "raw 0x%llx", config);
 289                 return buf;
 290         }
 291
 292         switch (type) {
 293         case PERF_TYPE_HARDWARE:
 294                 if (config < PERF_COUNT_HW_MAX)
 295                         return hw_event_names[config];
 296                 return "unknown-hardware";
 297
 298         case PERF_TYPE_HW_CACHE: {
 299                 u8 cache_type, cache_op, cache_result;
 300
 301                 cache_type   = (config >>  0) & 0xff;
 302                 if (cache_type > PERF_COUNT_HW_CACHE_MAX)
 303                         return "unknown-ext-hardware-cache-type";
 304
 305                 cache_op     = (config >>  8) & 0xff;
 306                 if (cache_op > PERF_COUNT_HW_CACHE_OP_MAX)
 307                         return "unknown-ext-hardware-cache-op";
 308
 309                 cache_result = (config >> 16) & 0xff;
 310                 if (cache_result > PERF_COUNT_HW_CACHE_RESULT_MAX)
 311                         return "unknown-ext-hardware-cache-result";
 312
 313                 if (!is_cache_op_valid(cache_type, cache_op))
 314                         return "invalid-cache";
 315
 316                 return event_cache_name(cache_type, cache_op, cache_result);
 317         }
 318
 319         case PERF_TYPE_SOFTWARE:
 320                 if (config < PERF_COUNT_SW_MAX)
 321                         return sw_event_names[config];
 322                 return "unknown-software";
 323
 324         case PERF_TYPE_TRACEPOINT:
 325                 return tracepoint_id_to_name(config);
 326
 327         default:
 328                 break;
 329         }
 330
 331         return "unknown";
 332 }
 333
 334 static int parse_aliases(const char **str, const char *names[][MAX_ALIASES], int size)
 335 {
 336         int i, j;
 337         int n, longest = -1;
 338
 339         for (i = 0; i < size; i++) {
 340                 for (j = 0; j < MAX_ALIASES && names[i][j]; j++) {
 341                         n = strlen(names[i][j]);
 342                         if (n > longest && !strncasecmp(*str, names[i][j], n))
 343                                 longest = n;
 344                 }
 345                 if (longest > 0) {
 346                         *str += longest;
 347                         return i;
 348                 }
 349         }
 350
 351         return -1;
 352 }
 353
 354 static enum event_result
 355 parse_generic_hw_event(const char **str, struct perf_event_attr *attr)
 356 {
 357         const char *s = *str;
 358         int cache_type = -1, cache_op = -1, cache_result = -1;
 359
 360         cache_type = parse_aliases(&s, hw_cache, PERF_COUNT_HW_CACHE_MAX);
 361         /*
 362          * No fallback - if we cannot get a clear cache type
 363          * then bail out:
 364          */
 365         if (cache_type == -1)
 366                 return EVT_FAILED;
 367
 368         while ((cache_op == -1 || cache_result == -1) && *s == '-') {
 369                 ++s;
 370
 371                 if (cache_op == -1) {
 372                         cache_op = parse_aliases(&s, hw_cache_op,
 373                                                 PERF_COUNT_HW_CACHE_OP_MAX);
 374                         if (cache_op >= 0) {
 375                                 if (!is_cache_op_valid(cache_type, cache_op))
 376                                         return 0;
 377                                 continue;
 378                         }
 379                 }
 380
 381                 if (cache_result == -1) {
 382                         cache_result = parse_aliases(&s, hw_cache_result,
 383                                                 PERF_COUNT_HW_CACHE_RESULT_MAX);
 384                         if (cache_result >= 0)
 385                                 continue;
 386                 }
 387
 388                 /*
 389                  * Can't parse this as a cache op or result, so back up
 390                  * to the '-'.
 391                  */
 392                 --s;
 393                 break;
 394         }
 395
 396         /*
 397          * Fall back to reads:
 398          */
 399         if (cache_op == -1)
 400                 cache_op = PERF_COUNT_HW_CACHE_OP_READ;
 401
 402         /*
 403          * Fall back to accesses:
 404          */
 405         if (cache_result == -1)
 406                 cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;
 407
 408         attr->config = cache_type | (cache_op << 8) | (cache_result << 16);
 409         attr->type = PERF_TYPE_HW_CACHE;
 410
 411         *str = s;
 412         return EVT_HANDLED;
 413 }
 414
 415 static enum event_result
 416 parse_single_tracepoint_event(char *sys_name,
 417                               const char *evt_name,
 418                               unsigned int evt_length,
 419                               char *flags,
 420                               struct perf_event_attr *attr,
 421                               const char **strp)
 422 {
 423         char evt_path[MAXPATHLEN];
 424         char id_buf[4];
 425         u64 id;
 426         int fd;
 427
 428         if (flags) {
 429                 if (!strncmp(flags, "record", strlen(flags))) {
 430                         attr->sample_type |= PERF_SAMPLE_RAW;
 431                         attr->sample_type |= PERF_SAMPLE_TIME;
 432                         attr->sample_type |= PERF_SAMPLE_CPU;
 433                 }
 434         }
 435
 436         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
 437                  sys_name, evt_name);
 438
 439         fd = open(evt_path, O_RDONLY);
 440         if (fd < 0)
 441                 return EVT_FAILED;
 442
 443         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
 444                 close(fd);
 445                 return EVT_FAILED;
 446         }
 447
 448         close(fd);
 449         id = atoll(id_buf);
 450         attr->config = id;
 451         attr->type = PERF_TYPE_TRACEPOINT;
 452         *strp = evt_name + evt_length;
 453
 454         return EVT_HANDLED;
 455 }
 456
 457 /* sys + ':' + event + ':' + flags*/
 458 #define MAX_EVOPT_LEN   (MAX_EVENT_LENGTH * 2 + 2 + 128)
 459 static enum event_result
 460 parse_subsystem_tracepoint_event(char *sys_name, char *flags)
 461 {
 462         char evt_path[MAXPATHLEN];
 463         struct dirent *evt_ent;
 464         DIR *evt_dir;
 465
 466         snprintf(evt_path, MAXPATHLEN, "%s/%s", debugfs_path, sys_name);
 467         evt_dir = opendir(evt_path);
 468
 469         if (!evt_dir) {
 470                 perror("Can't open event dir");
 471                 return EVT_FAILED;
 472         }
 473
 474         while ((evt_ent = readdir(evt_dir))) {
 475                 char event_opt[MAX_EVOPT_LEN + 1];
 476                 int len;
 477                 unsigned int rem = MAX_EVOPT_LEN;
 478
 479                 if (!strcmp(evt_ent->d_name, ".")
 480                     || !strcmp(evt_ent->d_name, "..")
 481                     || !strcmp(evt_ent->d_name, "enable")
 482                     || !strcmp(evt_ent->d_name, "filter"))
 483                         continue;
 484
 485                 len = snprintf(event_opt, MAX_EVOPT_LEN, "%s:%s", sys_name,
 486                                evt_ent->d_name);
 487                 if (len < 0)
 488                         return EVT_FAILED;
 489
 490                 rem -= len;
 491                 if (flags) {
 492                         if (rem < strlen(flags) + 1)
 493                                 return EVT_FAILED;
 494
 495                         strcat(event_opt, ":");
 496                         strcat(event_opt, flags);
 497                 }
 498
 499                 if (parse_events(NULL, event_opt, 0))
 500                         return EVT_FAILED;
 501         }
 502
 503         return EVT_HANDLED_ALL;
 504 }
 505
 506
 507 static enum event_result parse_tracepoint_event(const char **strp,
 508                                     struct perf_event_attr *attr)
 509 {
 510         const char *evt_name;
 511         char *flags;
 512         char sys_name[MAX_EVENT_LENGTH];
 513         unsigned int sys_length, evt_length;
 514
 515         if (valid_debugfs_mount(debugfs_path))
 516                 return 0;
 517
 518         evt_name = strchr(*strp, ':');
 519         if (!evt_name)
 520                 return EVT_FAILED;
 521
 522         sys_length = evt_name - *strp;
 523         if (sys_length >= MAX_EVENT_LENGTH)
 524                 return 0;
 525
 526         strncpy(sys_name, *strp, sys_length);
 527         sys_name[sys_length] = '\0';
 528         evt_name = evt_name + 1;
 529
 530         flags = strchr(evt_name, ':');
 531         if (flags) {
 532                 /* split it out: */
 533                 evt_name = strndup(evt_name, flags - evt_name);
 534                 flags++;
 535         }
 536
 537         evt_length = strlen(evt_name);
 538         if (evt_length >= MAX_EVENT_LENGTH)
 539                 return EVT_FAILED;
 540
 541         if (!strcmp(evt_name, "*")) {
 542                 *strp = evt_name + evt_length;
 543                 return parse_subsystem_tracepoint_event(sys_name, flags);
 544         } else
 545                 return parse_single_tracepoint_event(sys_name, evt_name,
 546                                                      evt_length, flags,
 547                                                      attr, strp);
 548 }
 549
 550 static int check_events(const char *str, unsigned int i)
 551 {
 552         int n;
 553
 554         n = strlen(event_symbols[i].symbol);
 555         if (!strncmp(str, event_symbols[i].symbol, n))
 556                 return n;
 557
 558         n = strlen(event_symbols[i].alias);
 559         if (n)
 560                 if (!strncmp(str, event_symbols[i].alias, n))
 561                         return n;
 562         return 0;
 563 }
 564
 565 static enum event_result
 566 parse_symbolic_event(const char **strp, struct perf_event_attr *attr)
 567 {
 568         const char *str = *strp;
 569         unsigned int i;
 570         int n;
 571
 572         for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
 573                 n = check_events(str, i);
 574                 if (n > 0) {
 575                         attr->type = event_symbols[i].type;
 576                         attr->config = event_symbols[i].config;
 577                         *strp = str + n;
 578                         return EVT_HANDLED;
 579                 }
 580         }
 581         return EVT_FAILED;
 582 }
 583
 584 static enum event_result
 585 parse_raw_event(const char **strp, struct perf_event_attr *attr)
 586 {
 587         const char *str = *strp;
 588         u64 config;
 589         int n;
 590
 591         if (*str != 'r')
 592                 return EVT_FAILED;
 593         n = hex2u64(str + 1, &config);
 594         if (n > 0) {
 595                 *strp = str + n + 1;
 596                 attr->type = PERF_TYPE_RAW;
 597                 attr->config = config;
 598                 return EVT_HANDLED;
 599         }
 600         return EVT_FAILED;
 601 }
 602
 603 static enum event_result
 604 parse_numeric_event(const char **strp, struct perf_event_attr *attr)
 605 {
 606         const char *str = *strp;
 607         char *endp;
 608         unsigned long type;
 609         u64 config;
 610
 611         type = strtoul(str, &endp, 0);
 612         if (endp > str && type < PERF_TYPE_MAX && *endp == ':') {
 613                 str = endp + 1;
 614                 config = strtoul(str, &endp, 0);
 615                 if (endp > str) {
 616                         attr->type = type;
 617                         attr->config = config;
 618                         *strp = endp;
 619                         return EVT_HANDLED;
 620                 }
 621         }
 622         return EVT_FAILED;
 623 }
 624
 625 static enum event_result
 626 parse_event_modifier(const char **strp, struct perf_event_attr *attr)
 627 {
 628         const char *str = *strp;
 629         int eu = 1, ek = 1, eh = 1;
 630
 631         if (*str++ != ':')
 632                 return 0;
 633         while (*str) {
 634                 if (*str == 'u')
 635                         eu = 0;
 636                 else if (*str == 'k')
 637                         ek = 0;
 638                 else if (*str == 'h')
 639                         eh = 0;
 640                 else
 641                         break;
 642                 ++str;
 643         }
 644         if (str >= *strp + 2) {
 645                 *strp = str;
 646                 attr->exclude_user   = eu;
 647                 attr->exclude_kernel = ek;
 648                 attr->exclude_hv     = eh;
 649                 return 1;
 650         }
 651         return 0;
 652 }
 653
 654 /*
 655  * Each event can have multiple symbolic names.
 656  * Symbolic names are (almost) exactly matched.
 657  */
 658 static enum event_result
 659 parse_event_symbols(const char **str, struct perf_event_attr *attr)
 660 {
 661         enum event_result ret;
 662
 663         ret = parse_tracepoint_event(str, attr);
 664         if (ret != EVT_FAILED)
 665                 goto modifier;
 666
 667         ret = parse_raw_event(str, attr);
 668         if (ret != EVT_FAILED)
 669                 goto modifier;
 670
 671         ret = parse_numeric_event(str, attr);
 672         if (ret != EVT_FAILED)
 673                 goto modifier;
 674
 675         ret = parse_symbolic_event(str, attr);
 676         if (ret != EVT_FAILED)
 677                 goto modifier;
 678
 679         ret = parse_generic_hw_event(str, attr);
 680         if (ret != EVT_FAILED)
 681                 goto modifier;
 682
 683         return EVT_FAILED;
 684
 685 modifier:
 686         parse_event_modifier(str, attr);
 687
 688         return ret;
 689 }
 690
 691 static void store_event_type(const char *orgname)
 692 {
 693         char filename[PATH_MAX], *c;
 694         FILE *file;
 695         int id;
 696
 697         sprintf(filename, "/sys/kernel/debug/tracing/events/%s/id", orgname);
 698         c = strchr(filename, ':');
 699         if (c)
 700                 *c = '/';
 701
 702         file = fopen(filename, "r");
 703         if (!file)
 704                 return;
 705         if (fscanf(file, "%i", &id) < 1)
 706                 die("cannot store event ID");
 707         fclose(file);
 708         perf_header__push_event(id, orgname);
 709 }
 710
 711
 712 int parse_events(const struct option *opt __used, const char *str, int unset __used)
 713 {
 714         struct perf_event_attr attr;
 715         enum event_result ret;
 716
 717         if (strchr(str, ':'))
 718                 store_event_type(str);
 719
 720         for (;;) {
 721                 if (nr_counters == MAX_COUNTERS)
 722                         return -1;
 723
 724                 memset(&attr, 0, sizeof(attr));
 725                 ret = parse_event_symbols(&str, &attr);
 726                 if (ret == EVT_FAILED)
 727                         return -1;
 728
 729                 if (!(*str == 0 || *str == ',' || isspace(*str)))
 730                         return -1;
 731
 732                 if (ret != EVT_HANDLED_ALL) {
 733                         attrs[nr_counters] = attr;
 734                         nr_counters++;
 735                 }
 736
 737                 if (*str == 0)
 738                         break;
 739                 if (*str == ',')
 740                         ++str;
 741                 while (isspace(*str))
 742                         ++str;
 743         }
 744
 745         return 0;
 746 }
 747
 748 static const char * const event_type_descriptors[] = {
 749         "",
 750         "Hardware event",
 751         "Software event",
 752         "Tracepoint event",
 753         "Hardware cache event",
 754 };
 755
 756 /*
 757  * Print the events from <debugfs_mount_point>/tracing/events
 758  */
 759
 760 static void print_tracepoint_events(void)
 761 {
 762         DIR *sys_dir, *evt_dir;
 763         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
 764         int sys_dir_fd;
 765         char evt_path[MAXPATHLEN];
 766
 767         if (valid_debugfs_mount(debugfs_path))
 768                 return;
 769
 770         sys_dir = opendir(debugfs_path);
 771         if (!sys_dir)
 772                 goto cleanup;
 773         sys_dir_fd = dirfd(sys_dir);
 774
 775         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
 776                 int dfd = openat(sys_dir_fd, sys_dirent.d_name,
 777                                  O_RDONLY|O_DIRECTORY), evt_dir_fd;
 778                 if (dfd == -1)
 779                         continue;
 780                 evt_dir = fdopendir(dfd);
 781                 if (!evt_dir) {
 782                         close(dfd);
 783                         continue;
 784                 }
 785                 evt_dir_fd = dirfd(evt_dir);
 786                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
 787                         snprintf(evt_path, MAXPATHLEN, "%s:%s",
 788                                  sys_dirent.d_name, evt_dirent.d_name);
 789                         fprintf(stderr, "  %-42s [%s]\n", evt_path,
 790                                 event_type_descriptors[PERF_TYPE_TRACEPOINT+1]);
 791                 }
 792                 closedir(evt_dir);
 793         }
 794
 795 cleanup:
 796         closedir(sys_dir);
 797 }
 798
 799 /*
 800  * Print the help text for the event symbols:
 801  */
 802 void print_events(void)
 803 {
 804         struct event_symbol *syms = event_symbols;
 805         unsigned int i, type, op, prev_type = -1;
 806         char name[40];
 807
 808         fprintf(stderr, "\n");
 809         fprintf(stderr, "List of pre-defined events (to be used in -e):\n");
 810
 811         for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
 812                 type = syms->type + 1;
 813                 if (type >= ARRAY_SIZE(event_type_descriptors))
 814                         type = 0;
 815
 816                 if (type != prev_type)
 817                         fprintf(stderr, "\n");
 818
 819                 if (strlen(syms->alias))
 820                         sprintf(name, "%s OR %s", syms->symbol, syms->alias);
 821                 else
 822                         strcpy(name, syms->symbol);
 823                 fprintf(stderr, "  %-42s [%s]\n", name,
 824                         event_type_descriptors[type]);
 825
 826                 prev_type = type;
 827         }
 828
 829         fprintf(stderr, "\n");
 830         for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
 831                 for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
 832                         /* skip invalid cache type */
 833                         if (!is_cache_op_valid(type, op))
 834                                 continue;
 835
 836                         for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
 837                                 fprintf(stderr, "  %-42s [%s]\n",
 838                                         event_cache_name(type, op, i),
 839                                         event_type_descriptors[4]);
 840                         }
 841                 }
 842         }
 843
 844         fprintf(stderr, "\n");
 845         fprintf(stderr, "  %-42s [raw hardware event descriptor]\n",
 846                 "rNNN");
 847         fprintf(stderr, "\n");
 848
 849         print_tracepoint_events();
 850
 851         exit(129);
 852 }