tools/perf/util/pmu.c

   1 #include <linux/list.h>
   2 #include <linux/compiler.h>
   3 #include <sys/types.h>
   4 #include <unistd.h>
   5 #include <stdio.h>
   6 #include <stdbool.h>
   7 #include <stdarg.h>
   8 #include <dirent.h>
   9 #include <api/fs/fs.h>
  10 #include <locale.h>
  11 #include "util.h"
  12 #include "pmu.h"
  13 #include "parse-events.h"
  14 #include "cpumap.h"
  15
  16 struct perf_pmu_format {
  17         char *name;
  18         int value;
  19         DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
  20         struct list_head list;
  21 };
  22
  23 #define EVENT_SOURCE_DEVICE_PATH "/bus/event_source/devices/"
  24
  25 int perf_pmu_parse(struct list_head *list, char *name);
  26 extern FILE *perf_pmu_in;
  27
  28 static LIST_HEAD(pmus);
  29
  30 /*
  31  * Parse & process all the sysfs attributes located under
  32  * the directory specified in 'dir' parameter.
  33  */
  34 int perf_pmu__format_parse(char *dir, struct list_head *head)
  35 {
  36         struct dirent *evt_ent;
  37         DIR *format_dir;
  38         int ret = 0;
  39
  40         format_dir = opendir(dir);
  41         if (!format_dir)
  42                 return -EINVAL;
  43
  44         while (!ret && (evt_ent = readdir(format_dir))) {
  45                 char path[PATH_MAX];
  46                 char *name = evt_ent->d_name;
  47                 FILE *file;
  48
  49                 if (!strcmp(name, ".") || !strcmp(name, ".."))
  50                         continue;
  51
  52                 snprintf(path, PATH_MAX, "%s/%s", dir, name);
  53
  54                 ret = -EINVAL;
  55                 file = fopen(path, "r");
  56                 if (!file)
  57                         break;
  58
  59                 perf_pmu_in = file;
  60                 ret = perf_pmu_parse(head, name);
  61                 fclose(file);
  62         }
  63
  64         closedir(format_dir);
  65         return ret;
  66 }
  67
  68 /*
  69  * Reading/parsing the default pmu format definition, which should be
  70  * located at:
  71  * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
  72  */
  73 static int pmu_format(const char *name, struct list_head *format)
  74 {
  75         struct stat st;
  76         char path[PATH_MAX];
  77         const char *sysfs = sysfs__mountpoint();
  78
  79         if (!sysfs)
  80                 return -1;
  81
  82         snprintf(path, PATH_MAX,
  83                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);
  84
  85         if (stat(path, &st) < 0)
  86                 return 0;       /* no error if format does not exist */
  87
  88         if (perf_pmu__format_parse(path, format))
  89                 return -1;
  90
  91         return 0;
  92 }
  93
  94 static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *name)
  95 {
  96         struct stat st;
  97         ssize_t sret;
  98         char scale[128];
  99         int fd, ret = -1;
 100         char path[PATH_MAX];
 101         const char *lc;
 102
 103         snprintf(path, PATH_MAX, "%s/%s.scale", dir, name);
 104
 105         fd = open(path, O_RDONLY);
 106         if (fd == -1)
 107                 return -1;
 108
 109         if (fstat(fd, &st) < 0)
 110                 goto error;
 111
 112         sret = read(fd, scale, sizeof(scale)-1);
 113         if (sret < 0)
 114                 goto error;
 115
 116         if (scale[sret - 1] == '\n')
 117                 scale[sret - 1] = '\0';
 118         else
 119                 scale[sret] = '\0';
 120
 121         /*
 122          * save current locale
 123          */
 124         lc = setlocale(LC_NUMERIC, NULL);
 125
 126         /*
 127          * force to C locale to ensure kernel
 128          * scale string is converted correctly.
 129          * kernel uses default C locale.
 130          */
 131         setlocale(LC_NUMERIC, "C");
 132
 133         alias->scale = strtod(scale, NULL);
 134
 135         /* restore locale */
 136         setlocale(LC_NUMERIC, lc);
 137
 138         ret = 0;
 139 error:
 140         close(fd);
 141         return ret;
 142 }
 143
 144 static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, char *dir, char *name)
 145 {
 146         char path[PATH_MAX];
 147         ssize_t sret;
 148         int fd;
 149
 150         snprintf(path, PATH_MAX, "%s/%s.unit", dir, name);
 151
 152         fd = open(path, O_RDONLY);
 153         if (fd == -1)
 154                 return -1;
 155
 156                 sret = read(fd, alias->unit, UNIT_MAX_LEN);
 157         if (sret < 0)
 158                 goto error;
 159
 160         close(fd);
 161
 162         if (alias->unit[sret - 1] == '\n')
 163                 alias->unit[sret - 1] = '\0';
 164         else
 165                 alias->unit[sret] = '\0';
 166
 167         return 0;
 168 error:
 169         close(fd);
 170         alias->unit[0] = '\0';
 171         return -1;
 172 }
 173
 174 static int
 175 perf_pmu__parse_per_pkg(struct perf_pmu_alias *alias, char *dir, char *name)
 176 {
 177         char path[PATH_MAX];
 178         int fd;
 179
 180         snprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, name);
 181
 182         fd = open(path, O_RDONLY);
 183         if (fd == -1)
 184                 return -1;
 185
 186         close(fd);
 187
 188         alias->per_pkg = true;
 189         return 0;
 190 }
 191
 192 static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias,
 193                                     char *dir, char *name)
 194 {
 195         char path[PATH_MAX];
 196         int fd;
 197
 198         snprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name);
 199
 200         fd = open(path, O_RDONLY);
 201         if (fd == -1)
 202                 return -1;
 203
 204         alias->snapshot = true;
 205         close(fd);
 206         return 0;
 207 }
 208
 209 static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
 210                                  char *desc __maybe_unused, char *val)
 211 {
 212         struct perf_pmu_alias *alias;
 213         int ret;
 214
 215         alias = malloc(sizeof(*alias));
 216         if (!alias)
 217                 return -ENOMEM;
 218
 219         INIT_LIST_HEAD(&alias->terms);
 220         alias->scale = 1.0;
 221         alias->unit[0] = '\0';
 222         alias->per_pkg = false;
 223         alias->snapshot = false;
 224
 225         ret = parse_events_terms(&alias->terms, val);
 226         if (ret) {
 227                 pr_err("Cannot parse alias %s: %d\n", val, ret);
 228                 free(alias);
 229                 return ret;
 230         }
 231
 232         alias->name = strdup(name);
 233         if (dir) {
 234                 /*
 235                  * load unit name and scale if available
 236                  */
 237                 perf_pmu__parse_unit(alias, dir, name);
 238                 perf_pmu__parse_scale(alias, dir, name);
 239                 perf_pmu__parse_per_pkg(alias, dir, name);
 240                 perf_pmu__parse_snapshot(alias, dir, name);
 241         }
 242
 243         list_add_tail(&alias->list, list);
 244
 245         return 0;
 246 }
 247
 248 static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
 249 {
 250         char buf[256];
 251         int ret;
 252
 253         ret = fread(buf, 1, sizeof(buf), file);
 254         if (ret == 0)
 255                 return -EINVAL;
 256
 257         buf[ret] = 0;
 258
 259         return __perf_pmu__new_alias(list, dir, name, NULL, buf);
 260 }
 261
 262 static inline bool pmu_alias_info_file(char *name)
 263 {
 264         size_t len;
 265
 266         len = strlen(name);
 267         if (len > 5 && !strcmp(name + len - 5, ".unit"))
 268                 return true;
 269         if (len > 6 && !strcmp(name + len - 6, ".scale"))
 270                 return true;
 271         if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
 272                 return true;
 273         if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
 274                 return true;
 275
 276         return false;
 277 }
 278
 279 /*
 280  * Process all the sysfs attributes located under the directory
 281  * specified in 'dir' parameter.
 282  */
 283 static int pmu_aliases_parse(char *dir, struct list_head *head)
 284 {
 285         struct dirent *evt_ent;
 286         DIR *event_dir;
 287         int ret = 0;
 288
 289         event_dir = opendir(dir);
 290         if (!event_dir)
 291                 return -EINVAL;
 292
 293         while (!ret && (evt_ent = readdir(event_dir))) {
 294                 char path[PATH_MAX];
 295                 char *name = evt_ent->d_name;
 296                 FILE *file;
 297
 298                 if (!strcmp(name, ".") || !strcmp(name, ".."))
 299                         continue;
 300
 301                 /*
 302                  * skip info files parsed in perf_pmu__new_alias()
 303                  */
 304                 if (pmu_alias_info_file(name))
 305                         continue;
 306
 307                 snprintf(path, PATH_MAX, "%s/%s", dir, name);
 308
 309                 ret = -EINVAL;
 310                 file = fopen(path, "r");
 311                 if (!file)
 312                         break;
 313
 314                 ret = perf_pmu__new_alias(head, dir, name, file);
 315                 fclose(file);
 316         }
 317
 318         closedir(event_dir);
 319         return ret;
 320 }
 321
 322 /*
 323  * Reading the pmu event aliases definition, which should be located at:
 324  * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
 325  */
 326 static int pmu_aliases(const char *name, struct list_head *head)
 327 {
 328         struct stat st;
 329         char path[PATH_MAX];
 330         const char *sysfs = sysfs__mountpoint();
 331
 332         if (!sysfs)
 333                 return -1;
 334
 335         snprintf(path, PATH_MAX,
 336                  "%s/bus/event_source/devices/%s/events", sysfs, name);
 337
 338         if (stat(path, &st) < 0)
 339                 return 0;        /* no error if 'events' does not exist */
 340
 341         if (pmu_aliases_parse(path, head))
 342                 return -1;
 343
 344         return 0;
 345 }
 346
 347 static int pmu_alias_terms(struct perf_pmu_alias *alias,
 348                            struct list_head *terms)
 349 {
 350         struct parse_events_term *term, *cloned;
 351         LIST_HEAD(list);
 352         int ret;
 353
 354         list_for_each_entry(term, &alias->terms, list) {
 355                 ret = parse_events_term__clone(&cloned, term);
 356                 if (ret) {
 357                         parse_events__free_terms(&list);
 358                         return ret;
 359                 }
 360                 list_add_tail(&cloned->list, &list);
 361         }
 362         list_splice(&list, terms);
 363         return 0;
 364 }
 365
 366 /*
 367  * Reading/parsing the default pmu type value, which should be
 368  * located at:
 369  * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
 370  */
 371 static int pmu_type(const char *name, __u32 *type)
 372 {
 373         struct stat st;
 374         char path[PATH_MAX];
 375         FILE *file;
 376         int ret = 0;
 377         const char *sysfs = sysfs__mountpoint();
 378
 379         if (!sysfs)
 380                 return -1;
 381
 382         snprintf(path, PATH_MAX,
 383                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
 384
 385         if (stat(path, &st) < 0)
 386                 return -1;
 387
 388         file = fopen(path, "r");
 389         if (!file)
 390                 return -EINVAL;
 391
 392         if (1 != fscanf(file, "%u", type))
 393                 ret = -1;
 394
 395         fclose(file);
 396         return ret;
 397 }
 398
 399 /* Add all pmus in sysfs to pmu list: */
 400 static void pmu_read_sysfs(void)
 401 {
 402         char path[PATH_MAX];
 403         DIR *dir;
 404         struct dirent *dent;
 405         const char *sysfs = sysfs__mountpoint();
 406
 407         if (!sysfs)
 408                 return;
 409
 410         snprintf(path, PATH_MAX,
 411                  "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
 412
 413         dir = opendir(path);
 414         if (!dir)
 415                 return;
 416
 417         while ((dent = readdir(dir))) {
 418                 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
 419                         continue;
 420                 /* add to static LIST_HEAD(pmus): */
 421                 perf_pmu__find(dent->d_name);
 422         }
 423
 424         closedir(dir);
 425 }
 426
 427 static struct cpu_map *pmu_cpumask(const char *name)
 428 {
 429         struct stat st;
 430         char path[PATH_MAX];
 431         FILE *file;
 432         struct cpu_map *cpus;
 433         const char *sysfs = sysfs__mountpoint();
 434
 435         if (!sysfs)
 436                 return NULL;
 437
 438         snprintf(path, PATH_MAX,
 439                  "%s/bus/event_source/devices/%s/cpumask", sysfs, name);
 440
 441         if (stat(path, &st) < 0)
 442                 return NULL;
 443
 444         file = fopen(path, "r");
 445         if (!file)
 446                 return NULL;
 447
 448         cpus = cpu_map__read(file);
 449         fclose(file);
 450         return cpus;
 451 }
 452
 453 struct perf_event_attr * __weak
 454 perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
 455 {
 456         return NULL;
 457 }
 458
 459 static struct perf_pmu *pmu_lookup(const char *name)
 460 {
 461         struct perf_pmu *pmu;
 462         LIST_HEAD(format);
 463         LIST_HEAD(aliases);
 464         __u32 type;
 465
 466         /*
 467          * The pmu data we store & need consists of the pmu
 468          * type value and format definitions. Load both right
 469          * now.
 470          */
 471         if (pmu_format(name, &format))
 472                 return NULL;
 473
 474         if (pmu_aliases(name, &aliases))
 475                 return NULL;
 476
 477         if (pmu_type(name, &type))
 478                 return NULL;
 479
 480         pmu = zalloc(sizeof(*pmu));
 481         if (!pmu)
 482                 return NULL;
 483
 484         pmu->cpus = pmu_cpumask(name);
 485
 486         INIT_LIST_HEAD(&pmu->format);
 487         INIT_LIST_HEAD(&pmu->aliases);
 488         list_splice(&format, &pmu->format);
 489         list_splice(&aliases, &pmu->aliases);
 490         pmu->name = strdup(name);
 491         pmu->type = type;
 492         list_add_tail(&pmu->list, &pmus);
 493
 494         pmu->default_config = perf_pmu__get_default_config(pmu);
 495
 496         return pmu;
 497 }
 498
 499 static struct perf_pmu *pmu_find(const char *name)
 500 {
 501         struct perf_pmu *pmu;
 502
 503         list_for_each_entry(pmu, &pmus, list)
 504                 if (!strcmp(pmu->name, name))
 505                         return pmu;
 506
 507         return NULL;
 508 }
 509
 510 struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
 511 {
 512         /*
 513          * pmu iterator: If pmu is NULL, we start at the begin,
 514          * otherwise return the next pmu. Returns NULL on end.
 515          */
 516         if (!pmu) {
 517                 pmu_read_sysfs();
 518                 pmu = list_prepare_entry(pmu, &pmus, list);
 519         }
 520         list_for_each_entry_continue(pmu, &pmus, list)
 521                 return pmu;
 522         return NULL;
 523 }
 524
 525 struct perf_pmu *perf_pmu__find(const char *name)
 526 {
 527         struct perf_pmu *pmu;
 528
 529         /*
 530          * Once PMU is loaded it stays in the list,
 531          * so we keep us from multiple reading/parsing
 532          * the pmu format definitions.
 533          */
 534         pmu = pmu_find(name);
 535         if (pmu)
 536                 return pmu;
 537
 538         return pmu_lookup(name);
 539 }
 540
 541 static struct perf_pmu_format *
 542 pmu_find_format(struct list_head *formats, const char *name)
 543 {
 544         struct perf_pmu_format *format;
 545
 546         list_for_each_entry(format, formats, list)
 547                 if (!strcmp(format->name, name))
 548                         return format;
 549
 550         return NULL;
 551 }
 552
 553 __u64 perf_pmu__format_bits(struct list_head *formats, const char *name)
 554 {
 555         struct perf_pmu_format *format = pmu_find_format(formats, name);
 556         __u64 bits = 0;
 557         int fbit;
 558
 559         if (!format)
 560                 return 0;
 561
 562         for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
 563                 bits |= 1ULL << fbit;
 564
 565         return bits;
 566 }
 567
 568 /*
 569  * Sets value based on the format definition (format parameter)
 570  * and unformated value (value parameter).
 571  */
 572 static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
 573                              bool zero)
 574 {
 575         unsigned long fbit, vbit;
 576
 577         for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
 578
 579                 if (!test_bit(fbit, format))
 580                         continue;
 581
 582                 if (value & (1llu << vbit++))
 583                         *v |= (1llu << fbit);
 584                 else if (zero)
 585                         *v &= ~(1llu << fbit);
 586         }
 587 }
 588
 589 static __u64 pmu_format_max_value(const unsigned long *format)
 590 {
 591         int w;
 592
 593         w = bitmap_weight(format, PERF_PMU_FORMAT_BITS);
 594         if (!w)
 595                 return 0;
 596         if (w < 64)
 597                 return (1ULL << w) - 1;
 598         return -1;
 599 }
 600
 601 /*
 602  * Term is a string term, and might be a param-term. Try to look up it's value
 603  * in the remaining terms.
 604  * - We have a term like "base-or-format-term=param-term",
 605  * - We need to find the value supplied for "param-term" (with param-term named
 606  *   in a config string) later on in the term list.
 607  */
 608 static int pmu_resolve_param_term(struct parse_events_term *term,
 609                                   struct list_head *head_terms,
 610                                   __u64 *value)
 611 {
 612         struct parse_events_term *t;
 613
 614         list_for_each_entry(t, head_terms, list) {
 615                 if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
 616                         if (!strcmp(t->config, term->config)) {
 617                                 t->used = true;
 618                                 *value = t->val.num;
 619                                 return 0;
 620                         }
 621                 }
 622         }
 623
 624         if (verbose)
 625                 printf("Required parameter '%s' not specified\n", term->config);
 626
 627         return -1;
 628 }
 629
 630 static char *pmu_formats_string(struct list_head *formats)
 631 {
 632         struct perf_pmu_format *format;
 633         char *str;
 634         struct strbuf buf;
 635         unsigned i = 0;
 636
 637         if (!formats)
 638                 return NULL;
 639
 640         strbuf_init(&buf, 0);
 641         /* sysfs exported terms */
 642         list_for_each_entry(format, formats, list)
 643                 strbuf_addf(&buf, i++ ? ",%s" : "%s",
 644                             format->name);
 645
 646         str = strbuf_detach(&buf, NULL);
 647         strbuf_release(&buf);
 648
 649         return str;
 650 }
 651
 652 /*
 653  * Setup one of config[12] attr members based on the
 654  * user input data - term parameter.
 655  */
 656 static int pmu_config_term(struct list_head *formats,
 657                            struct perf_event_attr *attr,
 658                            struct parse_events_term *term,
 659                            struct list_head *head_terms,
 660                            bool zero, struct parse_events_error *err)
 661 {
 662         struct perf_pmu_format *format;
 663         __u64 *vp;
 664         __u64 val, max_val;
 665
 666         /*
 667          * If this is a parameter we've already used for parameterized-eval,
 668          * skip it in normal eval.
 669          */
 670         if (term->used)
 671                 return 0;
 672
 673         /*
 674          * Hardcoded terms should be already in, so nothing
 675          * to be done for them.
 676          */
 677         if (parse_events__is_hardcoded_term(term))
 678                 return 0;
 679
 680         format = pmu_find_format(formats, term->config);
 681         if (!format) {
 682                 if (verbose)
 683                         printf("Invalid event/parameter '%s'\n", term->config);
 684                 if (err) {
 685                         char *pmu_term = pmu_formats_string(formats);
 686
 687                         err->idx  = term->err_term;
 688                         err->str  = strdup("unknown term");
 689                         err->help = parse_events_formats_error_string(pmu_term);
 690                         free(pmu_term);
 691                 }
 692                 return -EINVAL;
 693         }
 694
 695         switch (format->value) {
 696         case PERF_PMU_FORMAT_VALUE_CONFIG:
 697                 vp = &attr->config;
 698                 break;
 699         case PERF_PMU_FORMAT_VALUE_CONFIG1:
 700                 vp = &attr->config1;
 701                 break;
 702         case PERF_PMU_FORMAT_VALUE_CONFIG2:
 703                 vp = &attr->config2;
 704                 break;
 705         default:
 706                 return -EINVAL;
 707         }
 708
 709         /*
 710          * Either directly use a numeric term, or try to translate string terms
 711          * using event parameters.
 712          */
 713         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
 714                 val = term->val.num;
 715         else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
 716                 if (strcmp(term->val.str, "?")) {
 717                         if (verbose) {
 718                                 pr_info("Invalid sysfs entry %s=%s\n",
 719                                                 term->config, term->val.str);
 720                         }
 721                         if (err) {
 722                                 err->idx = term->err_val;
 723                                 err->str = strdup("expected numeric value");
 724                         }
 725                         return -EINVAL;
 726                 }
 727
 728                 if (pmu_resolve_param_term(term, head_terms, &val))
 729                         return -EINVAL;
 730         } else
 731                 return -EINVAL;
 732
 733         max_val = pmu_format_max_value(format->bits);
 734         if (val > max_val) {
 735                 if (err) {
 736                         err->idx = term->err_val;
 737                         if (asprintf(&err->str,
 738                                      "value too big for format, maximum is %llu",
 739                                      (unsigned long long)max_val) < 0)
 740                                 err->str = strdup("value too big for format");
 741                         return -EINVAL;
 742                 }
 743                 /*
 744                  * Assume we don't care if !err, in which case the value will be
 745                  * silently truncated.
 746                  */
 747         }
 748
 749         pmu_format_value(format->bits, val, vp, zero);
 750         return 0;
 751 }
 752
 753 int perf_pmu__config_terms(struct list_head *formats,
 754                            struct perf_event_attr *attr,
 755                            struct list_head *head_terms,
 756                            bool zero, struct parse_events_error *err)
 757 {
 758         struct parse_events_term *term;
 759
 760         list_for_each_entry(term, head_terms, list) {
 761                 if (pmu_config_term(formats, attr, term, head_terms,
 762                                     zero, err))
 763                         return -EINVAL;
 764         }
 765
 766         return 0;
 767 }
 768
 769 /*
 770  * Configures event's 'attr' parameter based on the:
 771  * 1) users input - specified in terms parameter
 772  * 2) pmu format definitions - specified by pmu parameter
 773  */
 774 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
 775                      struct list_head *head_terms,
 776                      struct parse_events_error *err)
 777 {
 778         bool zero = !!pmu->default_config;
 779
 780         attr->type = pmu->type;
 781         return perf_pmu__config_terms(&pmu->format, attr, head_terms,
 782                                       zero, err);
 783 }
 784
 785 static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
 786                                              struct parse_events_term *term)
 787 {
 788         struct perf_pmu_alias *alias;
 789         char *name;
 790
 791         if (parse_events__is_hardcoded_term(term))
 792                 return NULL;
 793
 794         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
 795                 if (term->val.num != 1)
 796                         return NULL;
 797                 if (pmu_find_format(&pmu->format, term->config))
 798                         return NULL;
 799                 name = term->config;
 800         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
 801                 if (strcasecmp(term->config, "event"))
 802                         return NULL;
 803                 name = term->val.str;
 804         } else {
 805                 return NULL;
 806         }
 807
 808         list_for_each_entry(alias, &pmu->aliases, list) {
 809                 if (!strcasecmp(alias->name, name))
 810                         return alias;
 811         }
 812         return NULL;
 813 }
 814
 815
 816 static int check_info_data(struct perf_pmu_alias *alias,
 817                            struct perf_pmu_info *info)
 818 {
 819         /*
 820          * Only one term in event definition can
 821          * define unit, scale and snapshot, fail
 822          * if there's more than one.
 823          */
 824         if ((info->unit && alias->unit) ||
 825             (info->scale && alias->scale) ||
 826             (info->snapshot && alias->snapshot))
 827                 return -EINVAL;
 828
 829         if (alias->unit)
 830                 info->unit = alias->unit;
 831
 832         if (alias->scale)
 833                 info->scale = alias->scale;
 834
 835         if (alias->snapshot)
 836                 info->snapshot = alias->snapshot;
 837
 838         return 0;
 839 }
 840
 841 /*
 842  * Find alias in the terms list and replace it with the terms
 843  * defined for the alias
 844  */
 845 int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
 846                           struct perf_pmu_info *info)
 847 {
 848         struct parse_events_term *term, *h;
 849         struct perf_pmu_alias *alias;
 850         int ret;
 851
 852         info->per_pkg = false;
 853
 854         /*
 855          * Mark unit and scale as not set
 856          * (different from default values, see below)
 857          */
 858         info->unit     = NULL;
 859         info->scale    = 0.0;
 860         info->snapshot = false;
 861
 862         list_for_each_entry_safe(term, h, head_terms, list) {
 863                 alias = pmu_find_alias(pmu, term);
 864                 if (!alias)
 865                         continue;
 866                 ret = pmu_alias_terms(alias, &term->list);
 867                 if (ret)
 868                         return ret;
 869
 870                 ret = check_info_data(alias, info);
 871                 if (ret)
 872                         return ret;
 873
 874                 if (alias->per_pkg)
 875                         info->per_pkg = true;
 876
 877                 list_del(&term->list);
 878                 free(term);
 879         }
 880
 881         /*
 882          * if no unit or scale foundin aliases, then
 883          * set defaults as for evsel
 884          * unit cannot left to NULL
 885          */
 886         if (info->unit == NULL)
 887                 info->unit   = "";
 888
 889         if (info->scale == 0.0)
 890                 info->scale  = 1.0;
 891
 892         return 0;
 893 }
 894
 895 int perf_pmu__new_format(struct list_head *list, char *name,
 896                          int config, unsigned long *bits)
 897 {
 898         struct perf_pmu_format *format;
 899
 900         format = zalloc(sizeof(*format));
 901         if (!format)
 902                 return -ENOMEM;
 903
 904         format->name = strdup(name);
 905         format->value = config;
 906         memcpy(format->bits, bits, sizeof(format->bits));
 907
 908         list_add_tail(&format->list, list);
 909         return 0;
 910 }
 911
 912 void perf_pmu__set_format(unsigned long *bits, long from, long to)
 913 {
 914         long b;
 915
 916         if (!to)
 917                 to = from;
 918
 919         memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
 920         for (b = from; b <= to; b++)
 921                 set_bit(b, bits);
 922 }
 923
 924 static int sub_non_neg(int a, int b)
 925 {
 926         if (b > a)
 927                 return 0;
 928         return a - b;
 929 }
 930
 931 static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
 932                           struct perf_pmu_alias *alias)
 933 {
 934         struct parse_events_term *term;
 935         int used = snprintf(buf, len, "%s/%s", pmu->name, alias->name);
 936
 937         list_for_each_entry(term, &alias->terms, list) {
 938                 if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
 939                         used += snprintf(buf + used, sub_non_neg(len, used),
 940                                         ",%s=%s", term->config,
 941                                         term->val.str);
 942         }
 943
 944         if (sub_non_neg(len, used) > 0) {
 945                 buf[used] = '/';
 946                 used++;
 947         }
 948         if (sub_non_neg(len, used) > 0) {
 949                 buf[used] = '\0';
 950                 used++;
 951         } else
 952                 buf[len - 1] = '\0';
 953
 954         return buf;
 955 }
 956
 957 static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
 958                              struct perf_pmu_alias *alias)
 959 {
 960         snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
 961         return buf;
 962 }
 963
 964 static int cmp_string(const void *a, const void *b)
 965 {
 966         const char * const *as = a;
 967         const char * const *bs = b;
 968         return strcmp(*as, *bs);
 969 }
 970
 971 void print_pmu_events(const char *event_glob, bool name_only)
 972 {
 973         struct perf_pmu *pmu;
 974         struct perf_pmu_alias *alias;
 975         char buf[1024];
 976         int printed = 0;
 977         int len, j;
 978         char **aliases;
 979
 980         pmu = NULL;
 981         len = 0;
 982         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
 983                 list_for_each_entry(alias, &pmu->aliases, list)
 984                         len++;
 985                 if (pmu->selectable)
 986                         len++;
 987         }
 988         aliases = zalloc(sizeof(char *) * len);
 989         if (!aliases)
 990                 goto out_enomem;
 991         pmu = NULL;
 992         j = 0;
 993         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
 994                 list_for_each_entry(alias, &pmu->aliases, list) {
 995                         char *name = format_alias(buf, sizeof(buf), pmu, alias);
 996                         bool is_cpu = !strcmp(pmu->name, "cpu");
 997
 998                         if (event_glob != NULL &&
 999                             !(strglobmatch(name, event_glob) ||
1000                               (!is_cpu && strglobmatch(alias->name,
1001                                                        event_glob))))
1002                                 continue;
1003
1004                         if (is_cpu && !name_only)
1005                                 name = format_alias_or(buf, sizeof(buf), pmu, alias);
1006
1007                         aliases[j] = strdup(name);
1008                         if (aliases[j] == NULL)
1009                                 goto out_enomem;
1010                         j++;
1011                 }
1012                 if (pmu->selectable &&
1013                     (event_glob == NULL || strglobmatch(pmu->name, event_glob))) {
1014                         char *s;
1015                         if (asprintf(&s, "%s//", pmu->name) < 0)
1016                                 goto out_enomem;
1017                         aliases[j] = s;
1018                         j++;
1019                 }
1020         }
1021         len = j;
1022         qsort(aliases, len, sizeof(char *), cmp_string);
1023         for (j = 0; j < len; j++) {
1024                 if (name_only) {
1025                         printf("%s ", aliases[j]);
1026                         continue;
1027                 }
1028                 printf("  %-50s [Kernel PMU event]\n", aliases[j]);
1029                 printed++;
1030         }
1031         if (printed && pager_in_use())
1032                 printf("\n");
1033 out_free:
1034         for (j = 0; j < len; j++)
1035                 zfree(&aliases[j]);
1036         zfree(&aliases);
1037         return;
1038
1039 out_enomem:
1040         printf("FATAL: not enough memory to print PMU events\n");
1041         if (aliases)
1042                 goto out_free;
1043 }
1044
1045 bool pmu_have_event(const char *pname, const char *name)
1046 {
1047         struct perf_pmu *pmu;
1048         struct perf_pmu_alias *alias;
1049
1050         pmu = NULL;
1051         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1052                 if (strcmp(pname, pmu->name))
1053                         continue;
1054                 list_for_each_entry(alias, &pmu->aliases, list)
1055                         if (!strcmp(alias->name, name))
1056                                 return true;
1057         }
1058         return false;
1059 }
1060
1061 static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
1062 {
1063         struct stat st;
1064         char path[PATH_MAX];
1065         const char *sysfs;
1066
1067         sysfs = sysfs__mountpoint();
1068         if (!sysfs)
1069                 return NULL;
1070
1071         snprintf(path, PATH_MAX,
1072                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/%s", sysfs, pmu->name, name);
1073
1074         if (stat(path, &st) < 0)
1075                 return NULL;
1076
1077         return fopen(path, "r");
1078 }
1079
1080 int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
1081                         ...)
1082 {
1083         va_list args;
1084         FILE *file;
1085         int ret = EOF;
1086
1087         va_start(args, fmt);
1088         file = perf_pmu__open_file(pmu, name);
1089         if (file) {
1090                 ret = vfscanf(file, fmt, args);
1091                 fclose(file);
1092         }
1093         va_end(args);
1094         return ret;
1095 }