tools/perf/util/parse-events.c

   1 #include "../../../include/linux/hw_breakpoint.h"
   2 #include "util.h"
   3 #include "../perf.h"
   4 #include "evlist.h"
   5 #include "evsel.h"
   6 #include "parse-options.h"
   7 #include "parse-events.h"
   8 #include "exec_cmd.h"
   9 #include "string.h"
  10 #include "symbol.h"
  11 #include "cache.h"
  12 #include "header.h"
  13 #include "debugfs.h"
  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   { CSW(ALIGNMENT_FAULTS),      "alignment-faults",     ""              },
  50   { CSW(EMULATION_FAULTS),      "emulation-faults",     ""              },
  51 };
  52
  53 #define __PERF_EVENT_FIELD(config, name) \
  54         ((config & PERF_EVENT_##name##_MASK) >> PERF_EVENT_##name##_SHIFT)
  55
  56 #define PERF_EVENT_RAW(config)  __PERF_EVENT_FIELD(config, RAW)
  57 #define PERF_EVENT_CONFIG(config)       __PERF_EVENT_FIELD(config, CONFIG)
  58 #define PERF_EVENT_TYPE(config) __PERF_EVENT_FIELD(config, TYPE)
  59 #define PERF_EVENT_ID(config)           __PERF_EVENT_FIELD(config, EVENT)
  60
  61 static const char *hw_event_names[] = {
  62         "cycles",
  63         "instructions",
  64         "cache-references",
  65         "cache-misses",
  66         "branches",
  67         "branch-misses",
  68         "bus-cycles",
  69 };
  70
  71 static const char *sw_event_names[] = {
  72         "cpu-clock-msecs",
  73         "task-clock-msecs",
  74         "page-faults",
  75         "context-switches",
  76         "CPU-migrations",
  77         "minor-faults",
  78         "major-faults",
  79         "alignment-faults",
  80         "emulation-faults",
  81 };
  82
  83 #define MAX_ALIASES 8
  84
  85 static const char *hw_cache[][MAX_ALIASES] = {
  86  { "L1-dcache", "l1-d",         "l1d",          "L1-data",              },
  87  { "L1-icache", "l1-i",         "l1i",          "L1-instruction",       },
  88  { "LLC",       "L2"                                                    },
  89  { "dTLB",      "d-tlb",        "Data-TLB",                             },
  90  { "iTLB",      "i-tlb",        "Instruction-TLB",                      },
  91  { "branch",    "branches",     "bpu",          "btb",          "bpc",  },
  92 };
  93
  94 static const char *hw_cache_op[][MAX_ALIASES] = {
  95  { "load",      "loads",        "read",                                 },
  96  { "store",     "stores",       "write",                                },
  97  { "prefetch",  "prefetches",   "speculative-read", "speculative-load", },
  98 };
  99
 100 static const char *hw_cache_result[][MAX_ALIASES] = {
 101  { "refs",      "Reference",    "ops",          "access",               },
 102  { "misses",    "miss",                                                 },
 103 };
 104
 105 #define C(x)            PERF_COUNT_HW_CACHE_##x
 106 #define CACHE_READ      (1 << C(OP_READ))
 107 #define CACHE_WRITE     (1 << C(OP_WRITE))
 108 #define CACHE_PREFETCH  (1 << C(OP_PREFETCH))
 109 #define COP(x)          (1 << x)
 110
 111 /*
 112  * cache operartion stat
 113  * L1I : Read and prefetch only
 114  * ITLB and BPU : Read-only
 115  */
 116 static unsigned long hw_cache_stat[C(MAX)] = {
 117  [C(L1D)]       = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 118  [C(L1I)]       = (CACHE_READ | CACHE_PREFETCH),
 119  [C(LL)]        = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 120  [C(DTLB)]      = (CACHE_READ | CACHE_WRITE | CACHE_PREFETCH),
 121  [C(ITLB)]      = (CACHE_READ),
 122  [C(BPU)]       = (CACHE_READ),
 123 };
 124
 125 #define for_each_subsystem(sys_dir, sys_dirent, sys_next)              \
 126         while (!readdir_r(sys_dir, &sys_dirent, &sys_next) && sys_next)        \
 127         if (sys_dirent.d_type == DT_DIR &&                                     \
 128            (strcmp(sys_dirent.d_name, ".")) &&                                 \
 129            (strcmp(sys_dirent.d_name, "..")))
 130
 131 static int tp_event_has_id(struct dirent *sys_dir, struct dirent *evt_dir)
 132 {
 133         char evt_path[MAXPATHLEN];
 134         int fd;
 135
 136         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
 137                         sys_dir->d_name, evt_dir->d_name);
 138         fd = open(evt_path, O_RDONLY);
 139         if (fd < 0)
 140                 return -EINVAL;
 141         close(fd);
 142
 143         return 0;
 144 }
 145
 146 #define for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next)              \
 147         while (!readdir_r(evt_dir, &evt_dirent, &evt_next) && evt_next)        \
 148         if (evt_dirent.d_type == DT_DIR &&                                     \
 149            (strcmp(evt_dirent.d_name, ".")) &&                                 \
 150            (strcmp(evt_dirent.d_name, "..")) &&                                \
 151            (!tp_event_has_id(&sys_dirent, &evt_dirent)))
 152
 153 #define MAX_EVENT_LENGTH 512
 154
 155
 156 struct tracepoint_path *tracepoint_id_to_path(u64 config)
 157 {
 158         struct tracepoint_path *path = NULL;
 159         DIR *sys_dir, *evt_dir;
 160         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
 161         char id_buf[4];
 162         int fd;
 163         u64 id;
 164         char evt_path[MAXPATHLEN];
 165         char dir_path[MAXPATHLEN];
 166
 167         if (debugfs_valid_mountpoint(debugfs_path))
 168                 return NULL;
 169
 170         sys_dir = opendir(debugfs_path);
 171         if (!sys_dir)
 172                 return NULL;
 173
 174         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
 175
 176                 snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
 177                          sys_dirent.d_name);
 178                 evt_dir = opendir(dir_path);
 179                 if (!evt_dir)
 180                         continue;
 181
 182                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
 183
 184                         snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
 185                                  evt_dirent.d_name);
 186                         fd = open(evt_path, O_RDONLY);
 187                         if (fd < 0)
 188                                 continue;
 189                         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
 190                                 close(fd);
 191                                 continue;
 192                         }
 193                         close(fd);
 194                         id = atoll(id_buf);
 195                         if (id == config) {
 196                                 closedir(evt_dir);
 197                                 closedir(sys_dir);
 198                                 path = zalloc(sizeof(*path));
 199                                 path->system = malloc(MAX_EVENT_LENGTH);
 200                                 if (!path->system) {
 201                                         free(path);
 202                                         return NULL;
 203                                 }
 204                                 path->name = malloc(MAX_EVENT_LENGTH);
 205                                 if (!path->name) {
 206                                         free(path->system);
 207                                         free(path);
 208                                         return NULL;
 209                                 }
 210                                 strncpy(path->system, sys_dirent.d_name,
 211                                         MAX_EVENT_LENGTH);
 212                                 strncpy(path->name, evt_dirent.d_name,
 213                                         MAX_EVENT_LENGTH);
 214                                 return path;
 215                         }
 216                 }
 217                 closedir(evt_dir);
 218         }
 219
 220         closedir(sys_dir);
 221         return NULL;
 222 }
 223
 224 #define TP_PATH_LEN (MAX_EVENT_LENGTH * 2 + 1)
 225 static const char *tracepoint_id_to_name(u64 config)
 226 {
 227         static char buf[TP_PATH_LEN];
 228         struct tracepoint_path *path;
 229
 230         path = tracepoint_id_to_path(config);
 231         if (path) {
 232                 snprintf(buf, TP_PATH_LEN, "%s:%s", path->system, path->name);
 233                 free(path->name);
 234                 free(path->system);
 235                 free(path);
 236         } else
 237                 snprintf(buf, TP_PATH_LEN, "%s:%s", "unknown", "unknown");
 238
 239         return buf;
 240 }
 241
 242 static int is_cache_op_valid(u8 cache_type, u8 cache_op)
 243 {
 244         if (hw_cache_stat[cache_type] & COP(cache_op))
 245                 return 1;       /* valid */
 246         else
 247                 return 0;       /* invalid */
 248 }
 249
 250 static char *event_cache_name(u8 cache_type, u8 cache_op, u8 cache_result)
 251 {
 252         static char name[50];
 253
 254         if (cache_result) {
 255                 sprintf(name, "%s-%s-%s", hw_cache[cache_type][0],
 256                         hw_cache_op[cache_op][0],
 257                         hw_cache_result[cache_result][0]);
 258         } else {
 259                 sprintf(name, "%s-%s", hw_cache[cache_type][0],
 260                         hw_cache_op[cache_op][1]);
 261         }
 262
 263         return name;
 264 }
 265
 266 const char *event_name(struct perf_evsel *evsel)
 267 {
 268         u64 config = evsel->attr.config;
 269         int type = evsel->attr.type;
 270
 271         return __event_name(type, config);
 272 }
 273
 274 const char *__event_name(int type, u64 config)
 275 {
 276         static char buf[32];
 277
 278         if (type == PERF_TYPE_RAW) {
 279                 sprintf(buf, "raw 0x%" PRIx64, config);
 280                 return buf;
 281         }
 282
 283         switch (type) {
 284         case PERF_TYPE_HARDWARE:
 285                 if (config < PERF_COUNT_HW_MAX)
 286                         return hw_event_names[config];
 287                 return "unknown-hardware";
 288
 289         case PERF_TYPE_HW_CACHE: {
 290                 u8 cache_type, cache_op, cache_result;
 291
 292                 cache_type   = (config >>  0) & 0xff;
 293                 if (cache_type > PERF_COUNT_HW_CACHE_MAX)
 294                         return "unknown-ext-hardware-cache-type";
 295
 296                 cache_op     = (config >>  8) & 0xff;
 297                 if (cache_op > PERF_COUNT_HW_CACHE_OP_MAX)
 298                         return "unknown-ext-hardware-cache-op";
 299
 300                 cache_result = (config >> 16) & 0xff;
 301                 if (cache_result > PERF_COUNT_HW_CACHE_RESULT_MAX)
 302                         return "unknown-ext-hardware-cache-result";
 303
 304                 if (!is_cache_op_valid(cache_type, cache_op))
 305                         return "invalid-cache";
 306
 307                 return event_cache_name(cache_type, cache_op, cache_result);
 308         }
 309
 310         case PERF_TYPE_SOFTWARE:
 311                 if (config < PERF_COUNT_SW_MAX)
 312                         return sw_event_names[config];
 313                 return "unknown-software";
 314
 315         case PERF_TYPE_TRACEPOINT:
 316                 return tracepoint_id_to_name(config);
 317
 318         default:
 319                 break;
 320         }
 321
 322         return "unknown";
 323 }
 324
 325 static int parse_aliases(const char **str, const char *names[][MAX_ALIASES], int size)
 326 {
 327         int i, j;
 328         int n, longest = -1;
 329
 330         for (i = 0; i < size; i++) {
 331                 for (j = 0; j < MAX_ALIASES && names[i][j]; j++) {
 332                         n = strlen(names[i][j]);
 333                         if (n > longest && !strncasecmp(*str, names[i][j], n))
 334                                 longest = n;
 335                 }
 336                 if (longest > 0) {
 337                         *str += longest;
 338                         return i;
 339                 }
 340         }
 341
 342         return -1;
 343 }
 344
 345 static enum event_result
 346 parse_generic_hw_event(const char **str, struct perf_event_attr *attr)
 347 {
 348         const char *s = *str;
 349         int cache_type = -1, cache_op = -1, cache_result = -1;
 350
 351         cache_type = parse_aliases(&s, hw_cache, PERF_COUNT_HW_CACHE_MAX);
 352         /*
 353          * No fallback - if we cannot get a clear cache type
 354          * then bail out:
 355          */
 356         if (cache_type == -1)
 357                 return EVT_FAILED;
 358
 359         while ((cache_op == -1 || cache_result == -1) && *s == '-') {
 360                 ++s;
 361
 362                 if (cache_op == -1) {
 363                         cache_op = parse_aliases(&s, hw_cache_op,
 364                                                 PERF_COUNT_HW_CACHE_OP_MAX);
 365                         if (cache_op >= 0) {
 366                                 if (!is_cache_op_valid(cache_type, cache_op))
 367                                         return 0;
 368                                 continue;
 369                         }
 370                 }
 371
 372                 if (cache_result == -1) {
 373                         cache_result = parse_aliases(&s, hw_cache_result,
 374                                                 PERF_COUNT_HW_CACHE_RESULT_MAX);
 375                         if (cache_result >= 0)
 376                                 continue;
 377                 }
 378
 379                 /*
 380                  * Can't parse this as a cache op or result, so back up
 381                  * to the '-'.
 382                  */
 383                 --s;
 384                 break;
 385         }
 386
 387         /*
 388          * Fall back to reads:
 389          */
 390         if (cache_op == -1)
 391                 cache_op = PERF_COUNT_HW_CACHE_OP_READ;
 392
 393         /*
 394          * Fall back to accesses:
 395          */
 396         if (cache_result == -1)
 397                 cache_result = PERF_COUNT_HW_CACHE_RESULT_ACCESS;
 398
 399         attr->config = cache_type | (cache_op << 8) | (cache_result << 16);
 400         attr->type = PERF_TYPE_HW_CACHE;
 401
 402         *str = s;
 403         return EVT_HANDLED;
 404 }
 405
 406 static enum event_result
 407 parse_single_tracepoint_event(char *sys_name,
 408                               const char *evt_name,
 409                               unsigned int evt_length,
 410                               struct perf_event_attr *attr,
 411                               const char **strp)
 412 {
 413         char evt_path[MAXPATHLEN];
 414         char id_buf[4];
 415         u64 id;
 416         int fd;
 417
 418         snprintf(evt_path, MAXPATHLEN, "%s/%s/%s/id", debugfs_path,
 419                  sys_name, evt_name);
 420
 421         fd = open(evt_path, O_RDONLY);
 422         if (fd < 0)
 423                 return EVT_FAILED;
 424
 425         if (read(fd, id_buf, sizeof(id_buf)) < 0) {
 426                 close(fd);
 427                 return EVT_FAILED;
 428         }
 429
 430         close(fd);
 431         id = atoll(id_buf);
 432         attr->config = id;
 433         attr->type = PERF_TYPE_TRACEPOINT;
 434         *strp += strlen(sys_name) + evt_length + 1; /* + 1 for the ':' */
 435
 436         attr->sample_type |= PERF_SAMPLE_RAW;
 437         attr->sample_type |= PERF_SAMPLE_TIME;
 438         attr->sample_type |= PERF_SAMPLE_CPU;
 439
 440         attr->sample_period = 1;
 441
 442
 443         return EVT_HANDLED;
 444 }
 445
 446 /* sys + ':' + event + ':' + flags*/
 447 #define MAX_EVOPT_LEN   (MAX_EVENT_LENGTH * 2 + 2 + 128)
 448 static enum event_result
 449 parse_multiple_tracepoint_event(char *sys_name, const char *evt_exp,
 450                                 char *flags)
 451 {
 452         char evt_path[MAXPATHLEN];
 453         struct dirent *evt_ent;
 454         DIR *evt_dir;
 455
 456         snprintf(evt_path, MAXPATHLEN, "%s/%s", debugfs_path, sys_name);
 457         evt_dir = opendir(evt_path);
 458
 459         if (!evt_dir) {
 460                 perror("Can't open event dir");
 461                 return EVT_FAILED;
 462         }
 463
 464         while ((evt_ent = readdir(evt_dir))) {
 465                 char event_opt[MAX_EVOPT_LEN + 1];
 466                 int len;
 467
 468                 if (!strcmp(evt_ent->d_name, ".")
 469                     || !strcmp(evt_ent->d_name, "..")
 470                     || !strcmp(evt_ent->d_name, "enable")
 471                     || !strcmp(evt_ent->d_name, "filter"))
 472                         continue;
 473
 474                 if (!strglobmatch(evt_ent->d_name, evt_exp))
 475                         continue;
 476
 477                 len = snprintf(event_opt, MAX_EVOPT_LEN, "%s:%s%s%s", sys_name,
 478                                evt_ent->d_name, flags ? ":" : "",
 479                                flags ?: "");
 480                 if (len < 0)
 481                         return EVT_FAILED;
 482
 483                 if (parse_events(NULL, event_opt, 0))
 484                         return EVT_FAILED;
 485         }
 486
 487         return EVT_HANDLED_ALL;
 488 }
 489
 490 static enum event_result parse_tracepoint_event(const char **strp,
 491                                     struct perf_event_attr *attr)
 492 {
 493         const char *evt_name;
 494         char *flags = NULL, *comma_loc;
 495         char sys_name[MAX_EVENT_LENGTH];
 496         unsigned int sys_length, evt_length;
 497
 498         if (debugfs_valid_mountpoint(debugfs_path))
 499                 return 0;
 500
 501         evt_name = strchr(*strp, ':');
 502         if (!evt_name)
 503                 return EVT_FAILED;
 504
 505         sys_length = evt_name - *strp;
 506         if (sys_length >= MAX_EVENT_LENGTH)
 507                 return 0;
 508
 509         strncpy(sys_name, *strp, sys_length);
 510         sys_name[sys_length] = '\0';
 511         evt_name = evt_name + 1;
 512
 513         comma_loc = strchr(evt_name, ',');
 514         if (comma_loc) {
 515                 /* take the event name up to the comma */
 516                 evt_name = strndup(evt_name, comma_loc - evt_name);
 517         }
 518         flags = strchr(evt_name, ':');
 519         if (flags) {
 520                 /* split it out: */
 521                 evt_name = strndup(evt_name, flags - evt_name);
 522                 flags++;
 523         }
 524
 525         evt_length = strlen(evt_name);
 526         if (evt_length >= MAX_EVENT_LENGTH)
 527                 return EVT_FAILED;
 528         if (strpbrk(evt_name, "*?")) {
 529                 *strp += strlen(sys_name) + evt_length + 1; /* 1 == the ':' */
 530                 return parse_multiple_tracepoint_event(sys_name, evt_name,
 531                                                        flags);
 532         } else {
 533                 return parse_single_tracepoint_event(sys_name, evt_name,
 534                                                      evt_length, attr, strp);
 535         }
 536 }
 537
 538 static enum event_result
 539 parse_breakpoint_type(const char *type, const char **strp,
 540                       struct perf_event_attr *attr)
 541 {
 542         int i;
 543
 544         for (i = 0; i < 3; i++) {
 545                 if (!type[i])
 546                         break;
 547
 548                 switch (type[i]) {
 549                 case 'r':
 550                         attr->bp_type |= HW_BREAKPOINT_R;
 551                         break;
 552                 case 'w':
 553                         attr->bp_type |= HW_BREAKPOINT_W;
 554                         break;
 555                 case 'x':
 556                         attr->bp_type |= HW_BREAKPOINT_X;
 557                         break;
 558                 default:
 559                         return EVT_FAILED;
 560                 }
 561         }
 562         if (!attr->bp_type) /* Default */
 563                 attr->bp_type = HW_BREAKPOINT_R | HW_BREAKPOINT_W;
 564
 565         *strp = type + i;
 566
 567         return EVT_HANDLED;
 568 }
 569
 570 static enum event_result
 571 parse_breakpoint_event(const char **strp, struct perf_event_attr *attr)
 572 {
 573         const char *target;
 574         const char *type;
 575         char *endaddr;
 576         u64 addr;
 577         enum event_result err;
 578
 579         target = strchr(*strp, ':');
 580         if (!target)
 581                 return EVT_FAILED;
 582
 583         if (strncmp(*strp, "mem", target - *strp) != 0)
 584                 return EVT_FAILED;
 585
 586         target++;
 587
 588         addr = strtoull(target, &endaddr, 0);
 589         if (target == endaddr)
 590                 return EVT_FAILED;
 591
 592         attr->bp_addr = addr;
 593         *strp = endaddr;
 594
 595         type = strchr(target, ':');
 596
 597         /* If no type is defined, just rw as default */
 598         if (!type) {
 599                 attr->bp_type = HW_BREAKPOINT_R | HW_BREAKPOINT_W;
 600         } else {
 601                 err = parse_breakpoint_type(++type, strp, attr);
 602                 if (err == EVT_FAILED)
 603                         return EVT_FAILED;
 604         }
 605
 606         /*
 607          * We should find a nice way to override the access length
 608          * Provide some defaults for now
 609          */
 610         if (attr->bp_type == HW_BREAKPOINT_X)
 611                 attr->bp_len = sizeof(long);
 612         else
 613                 attr->bp_len = HW_BREAKPOINT_LEN_4;
 614
 615         attr->type = PERF_TYPE_BREAKPOINT;
 616
 617         return EVT_HANDLED;
 618 }
 619
 620 static int check_events(const char *str, unsigned int i)
 621 {
 622         int n;
 623
 624         n = strlen(event_symbols[i].symbol);
 625         if (!strncmp(str, event_symbols[i].symbol, n))
 626                 return n;
 627
 628         n = strlen(event_symbols[i].alias);
 629         if (n)
 630                 if (!strncmp(str, event_symbols[i].alias, n))
 631                         return n;
 632         return 0;
 633 }
 634
 635 static enum event_result
 636 parse_symbolic_event(const char **strp, struct perf_event_attr *attr)
 637 {
 638         const char *str = *strp;
 639         unsigned int i;
 640         int n;
 641
 642         for (i = 0; i < ARRAY_SIZE(event_symbols); i++) {
 643                 n = check_events(str, i);
 644                 if (n > 0) {
 645                         attr->type = event_symbols[i].type;
 646                         attr->config = event_symbols[i].config;
 647                         *strp = str + n;
 648                         return EVT_HANDLED;
 649                 }
 650         }
 651         return EVT_FAILED;
 652 }
 653
 654 static enum event_result
 655 parse_raw_event(const char **strp, struct perf_event_attr *attr)
 656 {
 657         const char *str = *strp;
 658         u64 config;
 659         int n;
 660
 661         if (*str != 'r')
 662                 return EVT_FAILED;
 663         n = hex2u64(str + 1, &config);
 664         if (n > 0) {
 665                 *strp = str + n + 1;
 666                 attr->type = PERF_TYPE_RAW;
 667                 attr->config = config;
 668                 return EVT_HANDLED;
 669         }
 670         return EVT_FAILED;
 671 }
 672
 673 static enum event_result
 674 parse_numeric_event(const char **strp, struct perf_event_attr *attr)
 675 {
 676         const char *str = *strp;
 677         char *endp;
 678         unsigned long type;
 679         u64 config;
 680
 681         type = strtoul(str, &endp, 0);
 682         if (endp > str && type < PERF_TYPE_MAX && *endp == ':') {
 683                 str = endp + 1;
 684                 config = strtoul(str, &endp, 0);
 685                 if (endp > str) {
 686                         attr->type = type;
 687                         attr->config = config;
 688                         *strp = endp;
 689                         return EVT_HANDLED;
 690                 }
 691         }
 692         return EVT_FAILED;
 693 }
 694
 695 static enum event_result
 696 parse_event_modifier(const char **strp, struct perf_event_attr *attr)
 697 {
 698         const char *str = *strp;
 699         int exclude = 0;
 700         int eu = 0, ek = 0, eh = 0, precise = 0;
 701
 702         if (*str++ != ':')
 703                 return 0;
 704         while (*str) {
 705                 if (*str == 'u') {
 706                         if (!exclude)
 707                                 exclude = eu = ek = eh = 1;
 708                         eu = 0;
 709                 } else if (*str == 'k') {
 710                         if (!exclude)
 711                                 exclude = eu = ek = eh = 1;
 712                         ek = 0;
 713                 } else if (*str == 'h') {
 714                         if (!exclude)
 715                                 exclude = eu = ek = eh = 1;
 716                         eh = 0;
 717                 } else if (*str == 'p') {
 718                         precise++;
 719                 } else
 720                         break;
 721
 722                 ++str;
 723         }
 724         if (str >= *strp + 2) {
 725                 *strp = str;
 726                 attr->exclude_user   = eu;
 727                 attr->exclude_kernel = ek;
 728                 attr->exclude_hv     = eh;
 729                 attr->precise_ip     = precise;
 730                 return 1;
 731         }
 732         return 0;
 733 }
 734
 735 /*
 736  * Each event can have multiple symbolic names.
 737  * Symbolic names are (almost) exactly matched.
 738  */
 739 static enum event_result
 740 parse_event_symbols(const char **str, struct perf_event_attr *attr)
 741 {
 742         enum event_result ret;
 743
 744         ret = parse_tracepoint_event(str, attr);
 745         if (ret != EVT_FAILED)
 746                 goto modifier;
 747
 748         ret = parse_raw_event(str, attr);
 749         if (ret != EVT_FAILED)
 750                 goto modifier;
 751
 752         ret = parse_numeric_event(str, attr);
 753         if (ret != EVT_FAILED)
 754                 goto modifier;
 755
 756         ret = parse_symbolic_event(str, attr);
 757         if (ret != EVT_FAILED)
 758                 goto modifier;
 759
 760         ret = parse_generic_hw_event(str, attr);
 761         if (ret != EVT_FAILED)
 762                 goto modifier;
 763
 764         ret = parse_breakpoint_event(str, attr);
 765         if (ret != EVT_FAILED)
 766                 goto modifier;
 767
 768         fprintf(stderr, "invalid or unsupported event: '%s'\n", *str);
 769         fprintf(stderr, "Run 'perf list' for a list of valid events\n");
 770         return EVT_FAILED;
 771
 772 modifier:
 773         parse_event_modifier(str, attr);
 774
 775         return ret;
 776 }
 777
 778 int parse_events(const struct option *opt, const char *str, int unset __used)
 779 {
 780         struct perf_evlist *evlist = *(struct perf_evlist **)opt->value;
 781         struct perf_event_attr attr;
 782         enum event_result ret;
 783
 784         for (;;) {
 785                 memset(&attr, 0, sizeof(attr));
 786                 ret = parse_event_symbols(&str, &attr);
 787                 if (ret == EVT_FAILED)
 788                         return -1;
 789
 790                 if (!(*str == 0 || *str == ',' || isspace(*str)))
 791                         return -1;
 792
 793                 if (ret != EVT_HANDLED_ALL) {
 794                         struct perf_evsel *evsel;
 795                         evsel = perf_evsel__new(&attr, evlist->nr_entries);
 796                         if (evsel == NULL)
 797                                 return -1;
 798                         perf_evlist__add(evlist, evsel);
 799                 }
 800
 801                 if (*str == 0)
 802                         break;
 803                 if (*str == ',')
 804                         ++str;
 805                 while (isspace(*str))
 806                         ++str;
 807         }
 808
 809         return 0;
 810 }
 811
 812 int parse_filter(const struct option *opt, const char *str,
 813                  int unset __used)
 814 {
 815         struct perf_evlist *evlist = *(struct perf_evlist **)opt->value;
 816         struct perf_evsel *last = NULL;
 817
 818         if (evlist->nr_entries > 0)
 819                 last = list_entry(evlist->entries.prev, struct perf_evsel, node);
 820
 821         if (last == NULL || last->attr.type != PERF_TYPE_TRACEPOINT) {
 822                 fprintf(stderr,
 823                         "-F option should follow a -e tracepoint option\n");
 824                 return -1;
 825         }
 826
 827         last->filter = strdup(str);
 828         if (last->filter == NULL) {
 829                 fprintf(stderr, "not enough memory to hold filter string\n");
 830                 return -1;
 831         }
 832
 833         return 0;
 834 }
 835
 836 static const char * const event_type_descriptors[] = {
 837         "Hardware event",
 838         "Software event",
 839         "Tracepoint event",
 840         "Hardware cache event",
 841         "Raw hardware event descriptor",
 842         "Hardware breakpoint",
 843 };
 844
 845 /*
 846  * Print the events from <debugfs_mount_point>/tracing/events
 847  */
 848
 849 static void print_tracepoint_events(void)
 850 {
 851         DIR *sys_dir, *evt_dir;
 852         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
 853         char evt_path[MAXPATHLEN];
 854         char dir_path[MAXPATHLEN];
 855
 856         if (debugfs_valid_mountpoint(debugfs_path))
 857                 return;
 858
 859         sys_dir = opendir(debugfs_path);
 860         if (!sys_dir)
 861                 return;
 862
 863         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
 864
 865                 snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
 866                          sys_dirent.d_name);
 867                 evt_dir = opendir(dir_path);
 868                 if (!evt_dir)
 869                         continue;
 870
 871                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
 872                         snprintf(evt_path, MAXPATHLEN, "%s:%s",
 873                                  sys_dirent.d_name, evt_dirent.d_name);
 874                         printf("  %-42s [%s]\n", evt_path,
 875                                 event_type_descriptors[PERF_TYPE_TRACEPOINT]);
 876                 }
 877                 closedir(evt_dir);
 878         }
 879         closedir(sys_dir);
 880 }
 881
 882 /*
 883  * Check whether event is in <debugfs_mount_point>/tracing/events
 884  */
 885
 886 int is_valid_tracepoint(const char *event_string)
 887 {
 888         DIR *sys_dir, *evt_dir;
 889         struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
 890         char evt_path[MAXPATHLEN];
 891         char dir_path[MAXPATHLEN];
 892
 893         if (debugfs_valid_mountpoint(debugfs_path))
 894                 return 0;
 895
 896         sys_dir = opendir(debugfs_path);
 897         if (!sys_dir)
 898                 return 0;
 899
 900         for_each_subsystem(sys_dir, sys_dirent, sys_next) {
 901
 902                 snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
 903                          sys_dirent.d_name);
 904                 evt_dir = opendir(dir_path);
 905                 if (!evt_dir)
 906                         continue;
 907
 908                 for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
 909                         snprintf(evt_path, MAXPATHLEN, "%s:%s",
 910                                  sys_dirent.d_name, evt_dirent.d_name);
 911                         if (!strcmp(evt_path, event_string)) {
 912                                 closedir(evt_dir);
 913                                 closedir(sys_dir);
 914                                 return 1;
 915                         }
 916                 }
 917                 closedir(evt_dir);
 918         }
 919         closedir(sys_dir);
 920         return 0;
 921 }
 922
 923 /*
 924  * Print the help text for the event symbols:
 925  */
 926 void print_events(void)
 927 {
 928         struct event_symbol *syms = event_symbols;
 929         unsigned int i, type, op, prev_type = -1;
 930         char name[40];
 931
 932         printf("\n");
 933         printf("List of pre-defined events (to be used in -e):\n");
 934
 935         for (i = 0; i < ARRAY_SIZE(event_symbols); i++, syms++) {
 936                 type = syms->type;
 937
 938                 if (type != prev_type)
 939                         printf("\n");
 940
 941                 if (strlen(syms->alias))
 942                         sprintf(name, "%s OR %s", syms->symbol, syms->alias);
 943                 else
 944                         strcpy(name, syms->symbol);
 945                 printf("  %-42s [%s]\n", name,
 946                         event_type_descriptors[type]);
 947
 948                 prev_type = type;
 949         }
 950
 951         printf("\n");
 952         for (type = 0; type < PERF_COUNT_HW_CACHE_MAX; type++) {
 953                 for (op = 0; op < PERF_COUNT_HW_CACHE_OP_MAX; op++) {
 954                         /* skip invalid cache type */
 955                         if (!is_cache_op_valid(type, op))
 956                                 continue;
 957
 958                         for (i = 0; i < PERF_COUNT_HW_CACHE_RESULT_MAX; i++) {
 959                                 printf("  %-42s [%s]\n",
 960                                         event_cache_name(type, op, i),
 961                                         event_type_descriptors[PERF_TYPE_HW_CACHE]);
 962                         }
 963                 }
 964         }
 965
 966         printf("\n");
 967         printf("  %-42s [%s]\n",
 968                 "rNNN (see 'perf list --help' on how to encode it)",
 969                event_type_descriptors[PERF_TYPE_RAW]);
 970         printf("\n");
 971
 972         printf("  %-42s [%s]\n",
 973                         "mem:<addr>[:access]",
 974                         event_type_descriptors[PERF_TYPE_BREAKPOINT]);
 975         printf("\n");
 976
 977         print_tracepoint_events();
 978
 979         exit(129);
 980 }