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         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          * The lc string may be allocated in static storage,
 128          * so get a dynamic copy to make it survive setlocale
 129          * call below.
 130          */
 131         lc = strdup(lc);
 132         if (!lc) {
 133                 ret = -ENOMEM;
 134                 goto error;
 135         }
 136
 137         /*
 138          * force to C locale to ensure kernel
 139          * scale string is converted correctly.
 140          * kernel uses default C locale.
 141          */
 142         setlocale(LC_NUMERIC, "C");
 143
 144         alias->scale = strtod(scale, NULL);
 145
 146         /* restore locale */
 147         setlocale(LC_NUMERIC, lc);
 148
 149         free(lc);
 150
 151         ret = 0;
 152 error:
 153         close(fd);
 154         return ret;
 155 }
 156
 157 static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, char *dir, char *name)
 158 {
 159         char path[PATH_MAX];
 160         ssize_t sret;
 161         int fd;
 162
 163         snprintf(path, PATH_MAX, "%s/%s.unit", dir, name);
 164
 165         fd = open(path, O_RDONLY);
 166         if (fd == -1)
 167                 return -1;
 168
 169         sret = read(fd, alias->unit, UNIT_MAX_LEN);
 170         if (sret < 0)
 171                 goto error;
 172
 173         close(fd);
 174
 175         if (alias->unit[sret - 1] == '\n')
 176                 alias->unit[sret - 1] = '\0';
 177         else
 178                 alias->unit[sret] = '\0';
 179
 180         return 0;
 181 error:
 182         close(fd);
 183         alias->unit[0] = '\0';
 184         return -1;
 185 }
 186
 187 static int
 188 perf_pmu__parse_per_pkg(struct perf_pmu_alias *alias, char *dir, char *name)
 189 {
 190         char path[PATH_MAX];
 191         int fd;
 192
 193         snprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, name);
 194
 195         fd = open(path, O_RDONLY);
 196         if (fd == -1)
 197                 return -1;
 198
 199         close(fd);
 200
 201         alias->per_pkg = true;
 202         return 0;
 203 }
 204
 205 static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias,
 206                                     char *dir, char *name)
 207 {
 208         char path[PATH_MAX];
 209         int fd;
 210
 211         snprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name);
 212
 213         fd = open(path, O_RDONLY);
 214         if (fd == -1)
 215                 return -1;
 216
 217         alias->snapshot = true;
 218         close(fd);
 219         return 0;
 220 }
 221
 222 static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
 223                                  char *desc __maybe_unused, char *val)
 224 {
 225         struct perf_pmu_alias *alias;
 226         int ret;
 227
 228         alias = malloc(sizeof(*alias));
 229         if (!alias)
 230                 return -ENOMEM;
 231
 232         INIT_LIST_HEAD(&alias->terms);
 233         alias->scale = 1.0;
 234         alias->unit[0] = '\0';
 235         alias->per_pkg = false;
 236         alias->snapshot = false;
 237
 238         ret = parse_events_terms(&alias->terms, val);
 239         if (ret) {
 240                 pr_err("Cannot parse alias %s: %d\n", val, ret);
 241                 free(alias);
 242                 return ret;
 243         }
 244
 245         alias->name = strdup(name);
 246         if (dir) {
 247                 /*
 248                  * load unit name and scale if available
 249                  */
 250                 perf_pmu__parse_unit(alias, dir, name);
 251                 perf_pmu__parse_scale(alias, dir, name);
 252                 perf_pmu__parse_per_pkg(alias, dir, name);
 253                 perf_pmu__parse_snapshot(alias, dir, name);
 254         }
 255
 256         list_add_tail(&alias->list, list);
 257
 258         return 0;
 259 }
 260
 261 static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
 262 {
 263         char buf[256];
 264         int ret;
 265
 266         ret = fread(buf, 1, sizeof(buf), file);
 267         if (ret == 0)
 268                 return -EINVAL;
 269
 270         buf[ret] = 0;
 271
 272         return __perf_pmu__new_alias(list, dir, name, NULL, buf);
 273 }
 274
 275 static inline bool pmu_alias_info_file(char *name)
 276 {
 277         size_t len;
 278
 279         len = strlen(name);
 280         if (len > 5 && !strcmp(name + len - 5, ".unit"))
 281                 return true;
 282         if (len > 6 && !strcmp(name + len - 6, ".scale"))
 283                 return true;
 284         if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
 285                 return true;
 286         if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
 287                 return true;
 288
 289         return false;
 290 }
 291
 292 /*
 293  * Process all the sysfs attributes located under the directory
 294  * specified in 'dir' parameter.
 295  */
 296 static int pmu_aliases_parse(char *dir, struct list_head *head)
 297 {
 298         struct dirent *evt_ent;
 299         DIR *event_dir;
 300
 301         event_dir = opendir(dir);
 302         if (!event_dir)
 303                 return -EINVAL;
 304
 305         while ((evt_ent = readdir(event_dir))) {
 306                 char path[PATH_MAX];
 307                 char *name = evt_ent->d_name;
 308                 FILE *file;
 309
 310                 if (!strcmp(name, ".") || !strcmp(name, ".."))
 311                         continue;
 312
 313                 /*
 314                  * skip info files parsed in perf_pmu__new_alias()
 315                  */
 316                 if (pmu_alias_info_file(name))
 317                         continue;
 318
 319                 snprintf(path, PATH_MAX, "%s/%s", dir, name);
 320
 321                 file = fopen(path, "r");
 322                 if (!file) {
 323                         pr_debug("Cannot open %s\n", path);
 324                         continue;
 325                 }
 326
 327                 if (perf_pmu__new_alias(head, dir, name, file) < 0)
 328                         pr_debug("Cannot set up %s\n", name);
 329                 fclose(file);
 330         }
 331
 332         closedir(event_dir);
 333         return 0;
 334 }
 335
 336 /*
 337  * Reading the pmu event aliases definition, which should be located at:
 338  * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
 339  */
 340 static int pmu_aliases(const char *name, struct list_head *head)
 341 {
 342         struct stat st;
 343         char path[PATH_MAX];
 344         const char *sysfs = sysfs__mountpoint();
 345
 346         if (!sysfs)
 347                 return -1;
 348
 349         snprintf(path, PATH_MAX,
 350                  "%s/bus/event_source/devices/%s/events", sysfs, name);
 351
 352         if (stat(path, &st) < 0)
 353                 return 0;        /* no error if 'events' does not exist */
 354
 355         if (pmu_aliases_parse(path, head))
 356                 return -1;
 357
 358         return 0;
 359 }
 360
 361 static int pmu_alias_terms(struct perf_pmu_alias *alias,
 362                            struct list_head *terms)
 363 {
 364         struct parse_events_term *term, *cloned;
 365         LIST_HEAD(list);
 366         int ret;
 367
 368         list_for_each_entry(term, &alias->terms, list) {
 369                 ret = parse_events_term__clone(&cloned, term);
 370                 if (ret) {
 371                         parse_events_terms__purge(&list);
 372                         return ret;
 373                 }
 374                 list_add_tail(&cloned->list, &list);
 375         }
 376         list_splice(&list, terms);
 377         return 0;
 378 }
 379
 380 /*
 381  * Reading/parsing the default pmu type value, which should be
 382  * located at:
 383  * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
 384  */
 385 static int pmu_type(const char *name, __u32 *type)
 386 {
 387         struct stat st;
 388         char path[PATH_MAX];
 389         FILE *file;
 390         int ret = 0;
 391         const char *sysfs = sysfs__mountpoint();
 392
 393         if (!sysfs)
 394                 return -1;
 395
 396         snprintf(path, PATH_MAX,
 397                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
 398
 399         if (stat(path, &st) < 0)
 400                 return -1;
 401
 402         file = fopen(path, "r");
 403         if (!file)
 404                 return -EINVAL;
 405
 406         if (1 != fscanf(file, "%u", type))
 407                 ret = -1;
 408
 409         fclose(file);
 410         return ret;
 411 }
 412
 413 /* Add all pmus in sysfs to pmu list: */
 414 static void pmu_read_sysfs(void)
 415 {
 416         char path[PATH_MAX];
 417         DIR *dir;
 418         struct dirent *dent;
 419         const char *sysfs = sysfs__mountpoint();
 420
 421         if (!sysfs)
 422                 return;
 423
 424         snprintf(path, PATH_MAX,
 425                  "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
 426
 427         dir = opendir(path);
 428         if (!dir)
 429                 return;
 430
 431         while ((dent = readdir(dir))) {
 432                 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
 433                         continue;
 434                 /* add to static LIST_HEAD(pmus): */
 435                 perf_pmu__find(dent->d_name);
 436         }
 437
 438         closedir(dir);
 439 }
 440
 441 static struct cpu_map *pmu_cpumask(const char *name)
 442 {
 443         struct stat st;
 444         char path[PATH_MAX];
 445         FILE *file;
 446         struct cpu_map *cpus;
 447         const char *sysfs = sysfs__mountpoint();
 448
 449         if (!sysfs)
 450                 return NULL;
 451
 452         snprintf(path, PATH_MAX,
 453                  "%s/bus/event_source/devices/%s/cpumask", sysfs, name);
 454
 455         if (stat(path, &st) < 0)
 456                 return NULL;
 457
 458         file = fopen(path, "r");
 459         if (!file)
 460                 return NULL;
 461
 462         cpus = cpu_map__read(file);
 463         fclose(file);
 464         return cpus;
 465 }
 466
 467 struct perf_event_attr * __weak
 468 perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
 469 {
 470         return NULL;
 471 }
 472
 473 static struct perf_pmu *pmu_lookup(const char *name)
 474 {
 475         struct perf_pmu *pmu;
 476         LIST_HEAD(format);
 477         LIST_HEAD(aliases);
 478         __u32 type;
 479
 480         /*
 481          * The pmu data we store & need consists of the pmu
 482          * type value and format definitions. Load both right
 483          * now.
 484          */
 485         if (pmu_format(name, &format))
 486                 return NULL;
 487
 488         if (pmu_aliases(name, &aliases))
 489                 return NULL;
 490
 491         if (pmu_type(name, &type))
 492                 return NULL;
 493
 494         pmu = zalloc(sizeof(*pmu));
 495         if (!pmu)
 496                 return NULL;
 497
 498         pmu->cpus = pmu_cpumask(name);
 499
 500         INIT_LIST_HEAD(&pmu->format);
 501         INIT_LIST_HEAD(&pmu->aliases);
 502         list_splice(&format, &pmu->format);
 503         list_splice(&aliases, &pmu->aliases);
 504         pmu->name = strdup(name);
 505         pmu->type = type;
 506         list_add_tail(&pmu->list, &pmus);
 507
 508         pmu->default_config = perf_pmu__get_default_config(pmu);
 509
 510         return pmu;
 511 }
 512
 513 static struct perf_pmu *pmu_find(const char *name)
 514 {
 515         struct perf_pmu *pmu;
 516
 517         list_for_each_entry(pmu, &pmus, list)
 518                 if (!strcmp(pmu->name, name))
 519                         return pmu;
 520
 521         return NULL;
 522 }
 523
 524 struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
 525 {
 526         /*
 527          * pmu iterator: If pmu is NULL, we start at the begin,
 528          * otherwise return the next pmu. Returns NULL on end.
 529          */
 530         if (!pmu) {
 531                 pmu_read_sysfs();
 532                 pmu = list_prepare_entry(pmu, &pmus, list);
 533         }
 534         list_for_each_entry_continue(pmu, &pmus, list)
 535                 return pmu;
 536         return NULL;
 537 }
 538
 539 struct perf_pmu *perf_pmu__find(const char *name)
 540 {
 541         struct perf_pmu *pmu;
 542
 543         /*
 544          * Once PMU is loaded it stays in the list,
 545          * so we keep us from multiple reading/parsing
 546          * the pmu format definitions.
 547          */
 548         pmu = pmu_find(name);
 549         if (pmu)
 550                 return pmu;
 551
 552         return pmu_lookup(name);
 553 }
 554
 555 static struct perf_pmu_format *
 556 pmu_find_format(struct list_head *formats, const char *name)
 557 {
 558         struct perf_pmu_format *format;
 559
 560         list_for_each_entry(format, formats, list)
 561                 if (!strcmp(format->name, name))
 562                         return format;
 563
 564         return NULL;
 565 }
 566
 567 __u64 perf_pmu__format_bits(struct list_head *formats, const char *name)
 568 {
 569         struct perf_pmu_format *format = pmu_find_format(formats, name);
 570         __u64 bits = 0;
 571         int fbit;
 572
 573         if (!format)
 574                 return 0;
 575
 576         for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
 577                 bits |= 1ULL << fbit;
 578
 579         return bits;
 580 }
 581
 582 /*
 583  * Sets value based on the format definition (format parameter)
 584  * and unformated value (value parameter).
 585  */
 586 static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
 587                              bool zero)
 588 {
 589         unsigned long fbit, vbit;
 590
 591         for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
 592
 593                 if (!test_bit(fbit, format))
 594                         continue;
 595
 596                 if (value & (1llu << vbit++))
 597                         *v |= (1llu << fbit);
 598                 else if (zero)
 599                         *v &= ~(1llu << fbit);
 600         }
 601 }
 602
 603 static __u64 pmu_format_max_value(const unsigned long *format)
 604 {
 605         __u64 w = 0;
 606         int fbit;
 607
 608         for_each_set_bit(fbit, format, PERF_PMU_FORMAT_BITS)
 609                 w |= (1ULL << fbit);
 610
 611         return w;
 612 }
 613
 614 /*
 615  * Term is a string term, and might be a param-term. Try to look up it's value
 616  * in the remaining terms.
 617  * - We have a term like "base-or-format-term=param-term",
 618  * - We need to find the value supplied for "param-term" (with param-term named
 619  *   in a config string) later on in the term list.
 620  */
 621 static int pmu_resolve_param_term(struct parse_events_term *term,
 622                                   struct list_head *head_terms,
 623                                   __u64 *value)
 624 {
 625         struct parse_events_term *t;
 626
 627         list_for_each_entry(t, head_terms, list) {
 628                 if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
 629                         if (!strcmp(t->config, term->config)) {
 630                                 t->used = true;
 631                                 *value = t->val.num;
 632                                 return 0;
 633                         }
 634                 }
 635         }
 636
 637         if (verbose)
 638                 printf("Required parameter '%s' not specified\n", term->config);
 639
 640         return -1;
 641 }
 642
 643 static char *pmu_formats_string(struct list_head *formats)
 644 {
 645         struct perf_pmu_format *format;
 646         char *str = NULL;
 647         struct strbuf buf = STRBUF_INIT;
 648         unsigned i = 0;
 649
 650         if (!formats)
 651                 return NULL;
 652
 653         /* sysfs exported terms */
 654         list_for_each_entry(format, formats, list)
 655                 if (strbuf_addf(&buf, i++ ? ",%s" : "%s", format->name) < 0)
 656                         goto error;
 657
 658         str = strbuf_detach(&buf, NULL);
 659 error:
 660         strbuf_release(&buf);
 661
 662         return str;
 663 }
 664
 665 /*
 666  * Setup one of config[12] attr members based on the
 667  * user input data - term parameter.
 668  */
 669 static int pmu_config_term(struct list_head *formats,
 670                            struct perf_event_attr *attr,
 671                            struct parse_events_term *term,
 672                            struct list_head *head_terms,
 673                            bool zero, struct parse_events_error *err)
 674 {
 675         struct perf_pmu_format *format;
 676         __u64 *vp;
 677         __u64 val, max_val;
 678
 679         /*
 680          * If this is a parameter we've already used for parameterized-eval,
 681          * skip it in normal eval.
 682          */
 683         if (term->used)
 684                 return 0;
 685
 686         /*
 687          * Hardcoded terms should be already in, so nothing
 688          * to be done for them.
 689          */
 690         if (parse_events__is_hardcoded_term(term))
 691                 return 0;
 692
 693         format = pmu_find_format(formats, term->config);
 694         if (!format) {
 695                 if (verbose)
 696                         printf("Invalid event/parameter '%s'\n", term->config);
 697                 if (err) {
 698                         char *pmu_term = pmu_formats_string(formats);
 699
 700                         err->idx  = term->err_term;
 701                         err->str  = strdup("unknown term");
 702                         err->help = parse_events_formats_error_string(pmu_term);
 703                         free(pmu_term);
 704                 }
 705                 return -EINVAL;
 706         }
 707
 708         switch (format->value) {
 709         case PERF_PMU_FORMAT_VALUE_CONFIG:
 710                 vp = &attr->config;
 711                 break;
 712         case PERF_PMU_FORMAT_VALUE_CONFIG1:
 713                 vp = &attr->config1;
 714                 break;
 715         case PERF_PMU_FORMAT_VALUE_CONFIG2:
 716                 vp = &attr->config2;
 717                 break;
 718         default:
 719                 return -EINVAL;
 720         }
 721
 722         /*
 723          * Either directly use a numeric term, or try to translate string terms
 724          * using event parameters.
 725          */
 726         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
 727                 val = term->val.num;
 728         else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
 729                 if (strcmp(term->val.str, "?")) {
 730                         if (verbose) {
 731                                 pr_info("Invalid sysfs entry %s=%s\n",
 732                                                 term->config, term->val.str);
 733                         }
 734                         if (err) {
 735                                 err->idx = term->err_val;
 736                                 err->str = strdup("expected numeric value");
 737                         }
 738                         return -EINVAL;
 739                 }
 740
 741                 if (pmu_resolve_param_term(term, head_terms, &val))
 742                         return -EINVAL;
 743         } else
 744                 return -EINVAL;
 745
 746         max_val = pmu_format_max_value(format->bits);
 747         if (val > max_val) {
 748                 if (err) {
 749                         err->idx = term->err_val;
 750                         if (asprintf(&err->str,
 751                                      "value too big for format, maximum is %llu",
 752                                      (unsigned long long)max_val) < 0)
 753                                 err->str = strdup("value too big for format");
 754                         return -EINVAL;
 755                 }
 756                 /*
 757                  * Assume we don't care if !err, in which case the value will be
 758                  * silently truncated.
 759                  */
 760         }
 761
 762         pmu_format_value(format->bits, val, vp, zero);
 763         return 0;
 764 }
 765
 766 int perf_pmu__config_terms(struct list_head *formats,
 767                            struct perf_event_attr *attr,
 768                            struct list_head *head_terms,
 769                            bool zero, struct parse_events_error *err)
 770 {
 771         struct parse_events_term *term;
 772
 773         list_for_each_entry(term, head_terms, list) {
 774                 if (pmu_config_term(formats, attr, term, head_terms,
 775                                     zero, err))
 776                         return -EINVAL;
 777         }
 778
 779         return 0;
 780 }
 781
 782 /*
 783  * Configures event's 'attr' parameter based on the:
 784  * 1) users input - specified in terms parameter
 785  * 2) pmu format definitions - specified by pmu parameter
 786  */
 787 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
 788                      struct list_head *head_terms,
 789                      struct parse_events_error *err)
 790 {
 791         bool zero = !!pmu->default_config;
 792
 793         attr->type = pmu->type;
 794         return perf_pmu__config_terms(&pmu->format, attr, head_terms,
 795                                       zero, err);
 796 }
 797
 798 static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
 799                                              struct parse_events_term *term)
 800 {
 801         struct perf_pmu_alias *alias;
 802         char *name;
 803
 804         if (parse_events__is_hardcoded_term(term))
 805                 return NULL;
 806
 807         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
 808                 if (term->val.num != 1)
 809                         return NULL;
 810                 if (pmu_find_format(&pmu->format, term->config))
 811                         return NULL;
 812                 name = term->config;
 813         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
 814                 if (strcasecmp(term->config, "event"))
 815                         return NULL;
 816                 name = term->val.str;
 817         } else {
 818                 return NULL;
 819         }
 820
 821         list_for_each_entry(alias, &pmu->aliases, list) {
 822                 if (!strcasecmp(alias->name, name))
 823                         return alias;
 824         }
 825         return NULL;
 826 }
 827
 828
 829 static int check_info_data(struct perf_pmu_alias *alias,
 830                            struct perf_pmu_info *info)
 831 {
 832         /*
 833          * Only one term in event definition can
 834          * define unit, scale and snapshot, fail
 835          * if there's more than one.
 836          */
 837         if ((info->unit && alias->unit) ||
 838             (info->scale && alias->scale) ||
 839             (info->snapshot && alias->snapshot))
 840                 return -EINVAL;
 841
 842         if (alias->unit)
 843                 info->unit = alias->unit;
 844
 845         if (alias->scale)
 846                 info->scale = alias->scale;
 847
 848         if (alias->snapshot)
 849                 info->snapshot = alias->snapshot;
 850
 851         return 0;
 852 }
 853
 854 /*
 855  * Find alias in the terms list and replace it with the terms
 856  * defined for the alias
 857  */
 858 int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
 859                           struct perf_pmu_info *info)
 860 {
 861         struct parse_events_term *term, *h;
 862         struct perf_pmu_alias *alias;
 863         int ret;
 864
 865         info->per_pkg = false;
 866
 867         /*
 868          * Mark unit and scale as not set
 869          * (different from default values, see below)
 870          */
 871         info->unit     = NULL;
 872         info->scale    = 0.0;
 873         info->snapshot = false;
 874
 875         list_for_each_entry_safe(term, h, head_terms, list) {
 876                 alias = pmu_find_alias(pmu, term);
 877                 if (!alias)
 878                         continue;
 879                 ret = pmu_alias_terms(alias, &term->list);
 880                 if (ret)
 881                         return ret;
 882
 883                 ret = check_info_data(alias, info);
 884                 if (ret)
 885                         return ret;
 886
 887                 if (alias->per_pkg)
 888                         info->per_pkg = true;
 889
 890                 list_del(&term->list);
 891                 free(term);
 892         }
 893
 894         /*
 895          * if no unit or scale foundin aliases, then
 896          * set defaults as for evsel
 897          * unit cannot left to NULL
 898          */
 899         if (info->unit == NULL)
 900                 info->unit   = "";
 901
 902         if (info->scale == 0.0)
 903                 info->scale  = 1.0;
 904
 905         return 0;
 906 }
 907
 908 int perf_pmu__new_format(struct list_head *list, char *name,
 909                          int config, unsigned long *bits)
 910 {
 911         struct perf_pmu_format *format;
 912
 913         format = zalloc(sizeof(*format));
 914         if (!format)
 915                 return -ENOMEM;
 916
 917         format->name = strdup(name);
 918         format->value = config;
 919         memcpy(format->bits, bits, sizeof(format->bits));
 920
 921         list_add_tail(&format->list, list);
 922         return 0;
 923 }
 924
 925 void perf_pmu__set_format(unsigned long *bits, long from, long to)
 926 {
 927         long b;
 928
 929         if (!to)
 930                 to = from;
 931
 932         memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
 933         for (b = from; b <= to; b++)
 934                 set_bit(b, bits);
 935 }
 936
 937 static int sub_non_neg(int a, int b)
 938 {
 939         if (b > a)
 940                 return 0;
 941         return a - b;
 942 }
 943
 944 static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
 945                           struct perf_pmu_alias *alias)
 946 {
 947         struct parse_events_term *term;
 948         int used = snprintf(buf, len, "%s/%s", pmu->name, alias->name);
 949
 950         list_for_each_entry(term, &alias->terms, list) {
 951                 if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
 952                         used += snprintf(buf + used, sub_non_neg(len, used),
 953                                         ",%s=%s", term->config,
 954                                         term->val.str);
 955         }
 956
 957         if (sub_non_neg(len, used) > 0) {
 958                 buf[used] = '/';
 959                 used++;
 960         }
 961         if (sub_non_neg(len, used) > 0) {
 962                 buf[used] = '\0';
 963                 used++;
 964         } else
 965                 buf[len - 1] = '\0';
 966
 967         return buf;
 968 }
 969
 970 static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
 971                              struct perf_pmu_alias *alias)
 972 {
 973         snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
 974         return buf;
 975 }
 976
 977 static int cmp_string(const void *a, const void *b)
 978 {
 979         const char * const *as = a;
 980         const char * const *bs = b;
 981         return strcmp(*as, *bs);
 982 }
 983
 984 void print_pmu_events(const char *event_glob, bool name_only)
 985 {
 986         struct perf_pmu *pmu;
 987         struct perf_pmu_alias *alias;
 988         char buf[1024];
 989         int printed = 0;
 990         int len, j;
 991         char **aliases;
 992
 993         pmu = NULL;
 994         len = 0;
 995         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
 996                 list_for_each_entry(alias, &pmu->aliases, list)
 997                         len++;
 998                 if (pmu->selectable)
 999                         len++;
1000         }
1001         aliases = zalloc(sizeof(char *) * len);
1002         if (!aliases)
1003                 goto out_enomem;
1004         pmu = NULL;
1005         j = 0;
1006         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1007                 list_for_each_entry(alias, &pmu->aliases, list) {
1008                         char *name = format_alias(buf, sizeof(buf), pmu, alias);
1009                         bool is_cpu = !strcmp(pmu->name, "cpu");
1010
1011                         if (event_glob != NULL &&
1012                             !(strglobmatch(name, event_glob) ||
1013                               (!is_cpu && strglobmatch(alias->name,
1014                                                        event_glob))))
1015                                 continue;
1016
1017                         if (is_cpu && !name_only)
1018                                 name = format_alias_or(buf, sizeof(buf), pmu, alias);
1019
1020                         aliases[j] = strdup(name);
1021                         if (aliases[j] == NULL)
1022                                 goto out_enomem;
1023                         j++;
1024                 }
1025                 if (pmu->selectable &&
1026                     (event_glob == NULL || strglobmatch(pmu->name, event_glob))) {
1027                         char *s;
1028                         if (asprintf(&s, "%s//", pmu->name) < 0)
1029                                 goto out_enomem;
1030                         aliases[j] = s;
1031                         j++;
1032                 }
1033         }
1034         len = j;
1035         qsort(aliases, len, sizeof(char *), cmp_string);
1036         for (j = 0; j < len; j++) {
1037                 if (name_only) {
1038                         printf("%s ", aliases[j]);
1039                         continue;
1040                 }
1041                 printf("  %-50s [Kernel PMU event]\n", aliases[j]);
1042                 printed++;
1043         }
1044         if (printed && pager_in_use())
1045                 printf("\n");
1046 out_free:
1047         for (j = 0; j < len; j++)
1048                 zfree(&aliases[j]);
1049         zfree(&aliases);
1050         return;
1051
1052 out_enomem:
1053         printf("FATAL: not enough memory to print PMU events\n");
1054         if (aliases)
1055                 goto out_free;
1056 }
1057
1058 bool pmu_have_event(const char *pname, const char *name)
1059 {
1060         struct perf_pmu *pmu;
1061         struct perf_pmu_alias *alias;
1062
1063         pmu = NULL;
1064         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1065                 if (strcmp(pname, pmu->name))
1066                         continue;
1067                 list_for_each_entry(alias, &pmu->aliases, list)
1068                         if (!strcmp(alias->name, name))
1069                                 return true;
1070         }
1071         return false;
1072 }
1073
1074 static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
1075 {
1076         struct stat st;
1077         char path[PATH_MAX];
1078         const char *sysfs;
1079
1080         sysfs = sysfs__mountpoint();
1081         if (!sysfs)
1082                 return NULL;
1083
1084         snprintf(path, PATH_MAX,
1085                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/%s", sysfs, pmu->name, name);
1086
1087         if (stat(path, &st) < 0)
1088                 return NULL;
1089
1090         return fopen(path, "r");
1091 }
1092
1093 int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
1094                         ...)
1095 {
1096         va_list args;
1097         FILE *file;
1098         int ret = EOF;
1099
1100         va_start(args, fmt);
1101         file = perf_pmu__open_file(pmu, name);
1102         if (file) {
1103                 ret = vfscanf(file, fmt, args);
1104                 fclose(file);
1105         }
1106         va_end(args);
1107         return ret;
1108 }