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
 224         ret = parse_events_terms(&alias->terms, val);
 225         if (ret) {
 226                 pr_err("Cannot parse alias %s: %d\n", val, ret);
 227                 free(alias);
 228                 return ret;
 229         }
 230
 231         alias->name = strdup(name);
 232         if (dir) {
 233                 /*
 234                  * load unit name and scale if available
 235                  */
 236                 perf_pmu__parse_unit(alias, dir, name);
 237                 perf_pmu__parse_scale(alias, dir, name);
 238                 perf_pmu__parse_per_pkg(alias, dir, name);
 239                 perf_pmu__parse_snapshot(alias, dir, name);
 240         }
 241
 242         list_add_tail(&alias->list, list);
 243
 244         return 0;
 245 }
 246
 247 static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
 248 {
 249         char buf[256];
 250         int ret;
 251
 252         ret = fread(buf, 1, sizeof(buf), file);
 253         if (ret == 0)
 254                 return -EINVAL;
 255
 256         buf[ret] = 0;
 257
 258         return __perf_pmu__new_alias(list, dir, name, NULL, buf);
 259 }
 260
 261 static inline bool pmu_alias_info_file(char *name)
 262 {
 263         size_t len;
 264
 265         len = strlen(name);
 266         if (len > 5 && !strcmp(name + len - 5, ".unit"))
 267                 return true;
 268         if (len > 6 && !strcmp(name + len - 6, ".scale"))
 269                 return true;
 270         if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
 271                 return true;
 272         if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
 273                 return true;
 274
 275         return false;
 276 }
 277
 278 /*
 279  * Process all the sysfs attributes located under the directory
 280  * specified in 'dir' parameter.
 281  */
 282 static int pmu_aliases_parse(char *dir, struct list_head *head)
 283 {
 284         struct dirent *evt_ent;
 285         DIR *event_dir;
 286         int ret = 0;
 287
 288         event_dir = opendir(dir);
 289         if (!event_dir)
 290                 return -EINVAL;
 291
 292         while (!ret && (evt_ent = readdir(event_dir))) {
 293                 char path[PATH_MAX];
 294                 char *name = evt_ent->d_name;
 295                 FILE *file;
 296
 297                 if (!strcmp(name, ".") || !strcmp(name, ".."))
 298                         continue;
 299
 300                 /*
 301                  * skip info files parsed in perf_pmu__new_alias()
 302                  */
 303                 if (pmu_alias_info_file(name))
 304                         continue;
 305
 306                 snprintf(path, PATH_MAX, "%s/%s", dir, name);
 307
 308                 ret = -EINVAL;
 309                 file = fopen(path, "r");
 310                 if (!file)
 311                         break;
 312
 313                 ret = perf_pmu__new_alias(head, dir, name, file);
 314                 fclose(file);
 315         }
 316
 317         closedir(event_dir);
 318         return ret;
 319 }
 320
 321 /*
 322  * Reading the pmu event aliases definition, which should be located at:
 323  * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
 324  */
 325 static int pmu_aliases(const char *name, struct list_head *head)
 326 {
 327         struct stat st;
 328         char path[PATH_MAX];
 329         const char *sysfs = sysfs__mountpoint();
 330
 331         if (!sysfs)
 332                 return -1;
 333
 334         snprintf(path, PATH_MAX,
 335                  "%s/bus/event_source/devices/%s/events", sysfs, name);
 336
 337         if (stat(path, &st) < 0)
 338                 return 0;        /* no error if 'events' does not exist */
 339
 340         if (pmu_aliases_parse(path, head))
 341                 return -1;
 342
 343         return 0;
 344 }
 345
 346 static int pmu_alias_terms(struct perf_pmu_alias *alias,
 347                            struct list_head *terms)
 348 {
 349         struct parse_events_term *term, *cloned;
 350         LIST_HEAD(list);
 351         int ret;
 352
 353         list_for_each_entry(term, &alias->terms, list) {
 354                 ret = parse_events_term__clone(&cloned, term);
 355                 if (ret) {
 356                         parse_events__free_terms(&list);
 357                         return ret;
 358                 }
 359                 list_add_tail(&cloned->list, &list);
 360         }
 361         list_splice(&list, terms);
 362         return 0;
 363 }
 364
 365 /*
 366  * Reading/parsing the default pmu type value, which should be
 367  * located at:
 368  * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
 369  */
 370 static int pmu_type(const char *name, __u32 *type)
 371 {
 372         struct stat st;
 373         char path[PATH_MAX];
 374         FILE *file;
 375         int ret = 0;
 376         const char *sysfs = sysfs__mountpoint();
 377
 378         if (!sysfs)
 379                 return -1;
 380
 381         snprintf(path, PATH_MAX,
 382                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
 383
 384         if (stat(path, &st) < 0)
 385                 return -1;
 386
 387         file = fopen(path, "r");
 388         if (!file)
 389                 return -EINVAL;
 390
 391         if (1 != fscanf(file, "%u", type))
 392                 ret = -1;
 393
 394         fclose(file);
 395         return ret;
 396 }
 397
 398 /* Add all pmus in sysfs to pmu list: */
 399 static void pmu_read_sysfs(void)
 400 {
 401         char path[PATH_MAX];
 402         DIR *dir;
 403         struct dirent *dent;
 404         const char *sysfs = sysfs__mountpoint();
 405
 406         if (!sysfs)
 407                 return;
 408
 409         snprintf(path, PATH_MAX,
 410                  "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
 411
 412         dir = opendir(path);
 413         if (!dir)
 414                 return;
 415
 416         while ((dent = readdir(dir))) {
 417                 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
 418                         continue;
 419                 /* add to static LIST_HEAD(pmus): */
 420                 perf_pmu__find(dent->d_name);
 421         }
 422
 423         closedir(dir);
 424 }
 425
 426 static struct cpu_map *pmu_cpumask(const char *name)
 427 {
 428         struct stat st;
 429         char path[PATH_MAX];
 430         FILE *file;
 431         struct cpu_map *cpus;
 432         const char *sysfs = sysfs__mountpoint();
 433
 434         if (!sysfs)
 435                 return NULL;
 436
 437         snprintf(path, PATH_MAX,
 438                  "%s/bus/event_source/devices/%s/cpumask", sysfs, name);
 439
 440         if (stat(path, &st) < 0)
 441                 return NULL;
 442
 443         file = fopen(path, "r");
 444         if (!file)
 445                 return NULL;
 446
 447         cpus = cpu_map__read(file);
 448         fclose(file);
 449         return cpus;
 450 }
 451
 452 struct perf_event_attr * __weak
 453 perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
 454 {
 455         return NULL;
 456 }
 457
 458 static struct perf_pmu *pmu_lookup(const char *name)
 459 {
 460         struct perf_pmu *pmu;
 461         LIST_HEAD(format);
 462         LIST_HEAD(aliases);
 463         __u32 type;
 464
 465         /* No support for intel_bts or intel_pt so disallow them */
 466         if (!strcmp(name, "intel_bts") || !strcmp(name, "intel_pt"))
 467                 return NULL;
 468
 469         /*
 470          * The pmu data we store & need consists of the pmu
 471          * type value and format definitions. Load both right
 472          * now.
 473          */
 474         if (pmu_format(name, &format))
 475                 return NULL;
 476
 477         if (pmu_aliases(name, &aliases))
 478                 return NULL;
 479
 480         if (pmu_type(name, &type))
 481                 return NULL;
 482
 483         pmu = zalloc(sizeof(*pmu));
 484         if (!pmu)
 485                 return NULL;
 486
 487         pmu->cpus = pmu_cpumask(name);
 488
 489         INIT_LIST_HEAD(&pmu->format);
 490         INIT_LIST_HEAD(&pmu->aliases);
 491         list_splice(&format, &pmu->format);
 492         list_splice(&aliases, &pmu->aliases);
 493         pmu->name = strdup(name);
 494         pmu->type = type;
 495         list_add_tail(&pmu->list, &pmus);
 496
 497         pmu->default_config = perf_pmu__get_default_config(pmu);
 498
 499         return pmu;
 500 }
 501
 502 static struct perf_pmu *pmu_find(const char *name)
 503 {
 504         struct perf_pmu *pmu;
 505
 506         list_for_each_entry(pmu, &pmus, list)
 507                 if (!strcmp(pmu->name, name))
 508                         return pmu;
 509
 510         return NULL;
 511 }
 512
 513 struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
 514 {
 515         /*
 516          * pmu iterator: If pmu is NULL, we start at the begin,
 517          * otherwise return the next pmu. Returns NULL on end.
 518          */
 519         if (!pmu) {
 520                 pmu_read_sysfs();
 521                 pmu = list_prepare_entry(pmu, &pmus, list);
 522         }
 523         list_for_each_entry_continue(pmu, &pmus, list)
 524                 return pmu;
 525         return NULL;
 526 }
 527
 528 struct perf_pmu *perf_pmu__find(const char *name)
 529 {
 530         struct perf_pmu *pmu;
 531
 532         /*
 533          * Once PMU is loaded it stays in the list,
 534          * so we keep us from multiple reading/parsing
 535          * the pmu format definitions.
 536          */
 537         pmu = pmu_find(name);
 538         if (pmu)
 539                 return pmu;
 540
 541         return pmu_lookup(name);
 542 }
 543
 544 static struct perf_pmu_format *
 545 pmu_find_format(struct list_head *formats, char *name)
 546 {
 547         struct perf_pmu_format *format;
 548
 549         list_for_each_entry(format, formats, list)
 550                 if (!strcmp(format->name, name))
 551                         return format;
 552
 553         return NULL;
 554 }
 555
 556 /*
 557  * Sets value based on the format definition (format parameter)
 558  * and unformated value (value parameter).
 559  */
 560 static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
 561                              bool zero)
 562 {
 563         unsigned long fbit, vbit;
 564
 565         for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
 566
 567                 if (!test_bit(fbit, format))
 568                         continue;
 569
 570                 if (value & (1llu << vbit++))
 571                         *v |= (1llu << fbit);
 572                 else if (zero)
 573                         *v &= ~(1llu << fbit);
 574         }
 575 }
 576
 577 /*
 578  * Term is a string term, and might be a param-term. Try to look up it's value
 579  * in the remaining terms.
 580  * - We have a term like "base-or-format-term=param-term",
 581  * - We need to find the value supplied for "param-term" (with param-term named
 582  *   in a config string) later on in the term list.
 583  */
 584 static int pmu_resolve_param_term(struct parse_events_term *term,
 585                                   struct list_head *head_terms,
 586                                   __u64 *value)
 587 {
 588         struct parse_events_term *t;
 589
 590         list_for_each_entry(t, head_terms, list) {
 591                 if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
 592                         if (!strcmp(t->config, term->config)) {
 593                                 t->used = true;
 594                                 *value = t->val.num;
 595                                 return 0;
 596                         }
 597                 }
 598         }
 599
 600         if (verbose)
 601                 printf("Required parameter '%s' not specified\n", term->config);
 602
 603         return -1;
 604 }
 605
 606 static char *formats_error_string(struct list_head *formats)
 607 {
 608         struct perf_pmu_format *format;
 609         char *err, *str;
 610         static const char *static_terms = "config,config1,config2,name,period,branch_type\n";
 611         unsigned i = 0;
 612
 613         if (!asprintf(&str, "valid terms:"))
 614                 return NULL;
 615
 616         /* sysfs exported terms */
 617         list_for_each_entry(format, formats, list) {
 618                 char c = i++ ? ',' : ' ';
 619
 620                 err = str;
 621                 if (!asprintf(&str, "%s%c%s", err, c, format->name))
 622                         goto fail;
 623                 free(err);
 624         }
 625
 626         /* static terms */
 627         err = str;
 628         if (!asprintf(&str, "%s,%s", err, static_terms))
 629                 goto fail;
 630
 631         free(err);
 632         return str;
 633 fail:
 634         free(err);
 635         return NULL;
 636 }
 637
 638 /*
 639  * Setup one of config[12] attr members based on the
 640  * user input data - term parameter.
 641  */
 642 static int pmu_config_term(struct list_head *formats,
 643                            struct perf_event_attr *attr,
 644                            struct parse_events_term *term,
 645                            struct list_head *head_terms,
 646                            bool zero, struct parse_events_error *err)
 647 {
 648         struct perf_pmu_format *format;
 649         __u64 *vp;
 650         __u64 val;
 651
 652         /*
 653          * If this is a parameter we've already used for parameterized-eval,
 654          * skip it in normal eval.
 655          */
 656         if (term->used)
 657                 return 0;
 658
 659         /*
 660          * Hardcoded terms should be already in, so nothing
 661          * to be done for them.
 662          */
 663         if (parse_events__is_hardcoded_term(term))
 664                 return 0;
 665
 666         format = pmu_find_format(formats, term->config);
 667         if (!format) {
 668                 if (verbose)
 669                         printf("Invalid event/parameter '%s'\n", term->config);
 670                 if (err) {
 671                         err->idx  = term->err_term;
 672                         err->str  = strdup("unknown term");
 673                         err->help = formats_error_string(formats);
 674                 }
 675                 return -EINVAL;
 676         }
 677
 678         switch (format->value) {
 679         case PERF_PMU_FORMAT_VALUE_CONFIG:
 680                 vp = &attr->config;
 681                 break;
 682         case PERF_PMU_FORMAT_VALUE_CONFIG1:
 683                 vp = &attr->config1;
 684                 break;
 685         case PERF_PMU_FORMAT_VALUE_CONFIG2:
 686                 vp = &attr->config2;
 687                 break;
 688         default:
 689                 return -EINVAL;
 690         }
 691
 692         /*
 693          * Either directly use a numeric term, or try to translate string terms
 694          * using event parameters.
 695          */
 696         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
 697                 val = term->val.num;
 698         else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
 699                 if (strcmp(term->val.str, "?")) {
 700                         if (verbose) {
 701                                 pr_info("Invalid sysfs entry %s=%s\n",
 702                                                 term->config, term->val.str);
 703                         }
 704                         if (err) {
 705                                 err->idx = term->err_val;
 706                                 err->str = strdup("expected numeric value");
 707                         }
 708                         return -EINVAL;
 709                 }
 710
 711                 if (pmu_resolve_param_term(term, head_terms, &val))
 712                         return -EINVAL;
 713         } else
 714                 return -EINVAL;
 715
 716         pmu_format_value(format->bits, val, vp, zero);
 717         return 0;
 718 }
 719
 720 int perf_pmu__config_terms(struct list_head *formats,
 721                            struct perf_event_attr *attr,
 722                            struct list_head *head_terms,
 723                            bool zero, struct parse_events_error *err)
 724 {
 725         struct parse_events_term *term;
 726
 727         list_for_each_entry(term, head_terms, list) {
 728                 if (pmu_config_term(formats, attr, term, head_terms,
 729                                     zero, err))
 730                         return -EINVAL;
 731         }
 732
 733         return 0;
 734 }
 735
 736 /*
 737  * Configures event's 'attr' parameter based on the:
 738  * 1) users input - specified in terms parameter
 739  * 2) pmu format definitions - specified by pmu parameter
 740  */
 741 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
 742                      struct list_head *head_terms,
 743                      struct parse_events_error *err)
 744 {
 745         bool zero = !!pmu->default_config;
 746
 747         attr->type = pmu->type;
 748         return perf_pmu__config_terms(&pmu->format, attr, head_terms,
 749                                       zero, err);
 750 }
 751
 752 static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
 753                                              struct parse_events_term *term)
 754 {
 755         struct perf_pmu_alias *alias;
 756         char *name;
 757
 758         if (parse_events__is_hardcoded_term(term))
 759                 return NULL;
 760
 761         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
 762                 if (term->val.num != 1)
 763                         return NULL;
 764                 if (pmu_find_format(&pmu->format, term->config))
 765                         return NULL;
 766                 name = term->config;
 767         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
 768                 if (strcasecmp(term->config, "event"))
 769                         return NULL;
 770                 name = term->val.str;
 771         } else {
 772                 return NULL;
 773         }
 774
 775         list_for_each_entry(alias, &pmu->aliases, list) {
 776                 if (!strcasecmp(alias->name, name))
 777                         return alias;
 778         }
 779         return NULL;
 780 }
 781
 782
 783 static int check_info_data(struct perf_pmu_alias *alias,
 784                            struct perf_pmu_info *info)
 785 {
 786         /*
 787          * Only one term in event definition can
 788          * define unit, scale and snapshot, fail
 789          * if there's more than one.
 790          */
 791         if ((info->unit && alias->unit) ||
 792             (info->scale && alias->scale) ||
 793             (info->snapshot && alias->snapshot))
 794                 return -EINVAL;
 795
 796         if (alias->unit)
 797                 info->unit = alias->unit;
 798
 799         if (alias->scale)
 800                 info->scale = alias->scale;
 801
 802         if (alias->snapshot)
 803                 info->snapshot = alias->snapshot;
 804
 805         return 0;
 806 }
 807
 808 /*
 809  * Find alias in the terms list and replace it with the terms
 810  * defined for the alias
 811  */
 812 int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
 813                           struct perf_pmu_info *info)
 814 {
 815         struct parse_events_term *term, *h;
 816         struct perf_pmu_alias *alias;
 817         int ret;
 818
 819         info->per_pkg = false;
 820
 821         /*
 822          * Mark unit and scale as not set
 823          * (different from default values, see below)
 824          */
 825         info->unit     = NULL;
 826         info->scale    = 0.0;
 827         info->snapshot = false;
 828
 829         list_for_each_entry_safe(term, h, head_terms, list) {
 830                 alias = pmu_find_alias(pmu, term);
 831                 if (!alias)
 832                         continue;
 833                 ret = pmu_alias_terms(alias, &term->list);
 834                 if (ret)
 835                         return ret;
 836
 837                 ret = check_info_data(alias, info);
 838                 if (ret)
 839                         return ret;
 840
 841                 if (alias->per_pkg)
 842                         info->per_pkg = true;
 843
 844                 list_del(&term->list);
 845                 free(term);
 846         }
 847
 848         /*
 849          * if no unit or scale foundin aliases, then
 850          * set defaults as for evsel
 851          * unit cannot left to NULL
 852          */
 853         if (info->unit == NULL)
 854                 info->unit   = "";
 855
 856         if (info->scale == 0.0)
 857                 info->scale  = 1.0;
 858
 859         return 0;
 860 }
 861
 862 int perf_pmu__new_format(struct list_head *list, char *name,
 863                          int config, unsigned long *bits)
 864 {
 865         struct perf_pmu_format *format;
 866
 867         format = zalloc(sizeof(*format));
 868         if (!format)
 869                 return -ENOMEM;
 870
 871         format->name = strdup(name);
 872         format->value = config;
 873         memcpy(format->bits, bits, sizeof(format->bits));
 874
 875         list_add_tail(&format->list, list);
 876         return 0;
 877 }
 878
 879 void perf_pmu__set_format(unsigned long *bits, long from, long to)
 880 {
 881         long b;
 882
 883         if (!to)
 884                 to = from;
 885
 886         memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
 887         for (b = from; b <= to; b++)
 888                 set_bit(b, bits);
 889 }
 890
 891 static int sub_non_neg(int a, int b)
 892 {
 893         if (b > a)
 894                 return 0;
 895         return a - b;
 896 }
 897
 898 static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
 899                           struct perf_pmu_alias *alias)
 900 {
 901         struct parse_events_term *term;
 902         int used = snprintf(buf, len, "%s/%s", pmu->name, alias->name);
 903
 904         list_for_each_entry(term, &alias->terms, list) {
 905                 if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
 906                         used += snprintf(buf + used, sub_non_neg(len, used),
 907                                         ",%s=%s", term->config,
 908                                         term->val.str);
 909         }
 910
 911         if (sub_non_neg(len, used) > 0) {
 912                 buf[used] = '/';
 913                 used++;
 914         }
 915         if (sub_non_neg(len, used) > 0) {
 916                 buf[used] = '\0';
 917                 used++;
 918         } else
 919                 buf[len - 1] = '\0';
 920
 921         return buf;
 922 }
 923
 924 static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
 925                              struct perf_pmu_alias *alias)
 926 {
 927         snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
 928         return buf;
 929 }
 930
 931 static int cmp_string(const void *a, const void *b)
 932 {
 933         const char * const *as = a;
 934         const char * const *bs = b;
 935         return strcmp(*as, *bs);
 936 }
 937
 938 void print_pmu_events(const char *event_glob, bool name_only)
 939 {
 940         struct perf_pmu *pmu;
 941         struct perf_pmu_alias *alias;
 942         char buf[1024];
 943         int printed = 0;
 944         int len, j;
 945         char **aliases;
 946
 947         pmu = NULL;
 948         len = 0;
 949         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
 950                 list_for_each_entry(alias, &pmu->aliases, list)
 951                         len++;
 952                 if (pmu->selectable)
 953                         len++;
 954         }
 955         aliases = zalloc(sizeof(char *) * len);
 956         if (!aliases)
 957                 goto out_enomem;
 958         pmu = NULL;
 959         j = 0;
 960         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
 961                 list_for_each_entry(alias, &pmu->aliases, list) {
 962                         char *name = format_alias(buf, sizeof(buf), pmu, alias);
 963                         bool is_cpu = !strcmp(pmu->name, "cpu");
 964
 965                         if (event_glob != NULL &&
 966                             !(strglobmatch(name, event_glob) ||
 967                               (!is_cpu && strglobmatch(alias->name,
 968                                                        event_glob))))
 969                                 continue;
 970
 971                         if (is_cpu && !name_only)
 972                                 name = format_alias_or(buf, sizeof(buf), pmu, alias);
 973
 974                         aliases[j] = strdup(name);
 975                         if (aliases[j] == NULL)
 976                                 goto out_enomem;
 977                         j++;
 978                 }
 979                 if (pmu->selectable) {
 980                         char *s;
 981                         if (asprintf(&s, "%s//", pmu->name) < 0)
 982                                 goto out_enomem;
 983                         aliases[j] = s;
 984                         j++;
 985                 }
 986         }
 987         len = j;
 988         qsort(aliases, len, sizeof(char *), cmp_string);
 989         for (j = 0; j < len; j++) {
 990                 if (name_only) {
 991                         printf("%s ", aliases[j]);
 992                         continue;
 993                 }
 994                 printf("  %-50s [Kernel PMU event]\n", aliases[j]);
 995                 printed++;
 996         }
 997         if (printed)
 998                 printf("\n");
 999 out_free:
1000         for (j = 0; j < len; j++)
1001                 zfree(&aliases[j]);
1002         zfree(&aliases);
1003         return;
1004
1005 out_enomem:
1006         printf("FATAL: not enough memory to print PMU events\n");
1007         if (aliases)
1008                 goto out_free;
1009 }
1010
1011 bool pmu_have_event(const char *pname, const char *name)
1012 {
1013         struct perf_pmu *pmu;
1014         struct perf_pmu_alias *alias;
1015
1016         pmu = NULL;
1017         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1018                 if (strcmp(pname, pmu->name))
1019                         continue;
1020                 list_for_each_entry(alias, &pmu->aliases, list)
1021                         if (!strcmp(alias->name, name))
1022                                 return true;
1023         }
1024         return false;
1025 }
1026
1027 static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
1028 {
1029         struct stat st;
1030         char path[PATH_MAX];
1031         const char *sysfs;
1032
1033         sysfs = sysfs__mountpoint();
1034         if (!sysfs)
1035                 return NULL;
1036
1037         snprintf(path, PATH_MAX,
1038                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/%s", sysfs, pmu->name, name);
1039
1040         if (stat(path, &st) < 0)
1041                 return NULL;
1042
1043         return fopen(path, "r");
1044 }
1045
1046 int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
1047                         ...)
1048 {
1049         va_list args;
1050         FILE *file;
1051         int ret = EOF;
1052
1053         va_start(args, fmt);
1054         file = perf_pmu__open_file(pmu, name);
1055         if (file) {
1056                 ret = vfscanf(file, fmt, args);
1057                 fclose(file);
1058         }
1059         va_end(args);
1060         return ret;
1061 }