tools/perf/util/pmu.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/list.h>
   3 #include <linux/compiler.h>
   4 #include <linux/string.h>
   5 #include <linux/zalloc.h>
   6 #include <subcmd/pager.h>
   7 #include <sys/types.h>
   8 #include <errno.h>
   9 #include <fcntl.h>
  10 #include <sys/stat.h>
  11 #include <unistd.h>
  12 #include <stdio.h>
  13 #include <stdbool.h>
  14 #include <stdarg.h>
  15 #include <dirent.h>
  16 #include <api/fs/fs.h>
  17 #include <locale.h>
  18 #include <regex.h>
  19 #include <perf/cpumap.h>
  20 #include "debug.h"
  21 #include "pmu.h"
  22 #include "parse-events.h"
  23 #include "header.h"
  24 #include "pmu-events/pmu-events.h"
  25 #include "string2.h"
  26 #include "strbuf.h"
  27 #include "fncache.h"
  28
  29 struct perf_pmu_format {
  30         char *name;
  31         int value;
  32         DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
  33         struct list_head list;
  34 };
  35
  36 int perf_pmu_parse(struct list_head *list, char *name);
  37 extern FILE *perf_pmu_in;
  38
  39 static LIST_HEAD(pmus);
  40
  41 /*
  42  * Parse & process all the sysfs attributes located under
  43  * the directory specified in 'dir' parameter.
  44  */
  45 int perf_pmu__format_parse(char *dir, struct list_head *head)
  46 {
  47         struct dirent *evt_ent;
  48         DIR *format_dir;
  49         int ret = 0;
  50
  51         format_dir = opendir(dir);
  52         if (!format_dir)
  53                 return -EINVAL;
  54
  55         while (!ret && (evt_ent = readdir(format_dir))) {
  56                 char path[PATH_MAX];
  57                 char *name = evt_ent->d_name;
  58                 FILE *file;
  59
  60                 if (!strcmp(name, ".") || !strcmp(name, ".."))
  61                         continue;
  62
  63                 snprintf(path, PATH_MAX, "%s/%s", dir, name);
  64
  65                 ret = -EINVAL;
  66                 file = fopen(path, "r");
  67                 if (!file)
  68                         break;
  69
  70                 perf_pmu_in = file;
  71                 ret = perf_pmu_parse(head, name);
  72                 fclose(file);
  73         }
  74
  75         closedir(format_dir);
  76         return ret;
  77 }
  78
  79 /*
  80  * Reading/parsing the default pmu format definition, which should be
  81  * located at:
  82  * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
  83  */
  84 static int pmu_format(const char *name, struct list_head *format)
  85 {
  86         char path[PATH_MAX];
  87         const char *sysfs = sysfs__mountpoint();
  88
  89         if (!sysfs)
  90                 return -1;
  91
  92         snprintf(path, PATH_MAX,
  93                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);
  94
  95         if (!file_available(path))
  96                 return 0;
  97
  98         if (perf_pmu__format_parse(path, format))
  99                 return -1;
 100
 101         return 0;
 102 }
 103
 104 int perf_pmu__convert_scale(const char *scale, char **end, double *sval)
 105 {
 106         char *lc;
 107         int ret = 0;
 108
 109         /*
 110          * save current locale
 111          */
 112         lc = setlocale(LC_NUMERIC, NULL);
 113
 114         /*
 115          * The lc string may be allocated in static storage,
 116          * so get a dynamic copy to make it survive setlocale
 117          * call below.
 118          */
 119         lc = strdup(lc);
 120         if (!lc) {
 121                 ret = -ENOMEM;
 122                 goto out;
 123         }
 124
 125         /*
 126          * force to C locale to ensure kernel
 127          * scale string is converted correctly.
 128          * kernel uses default C locale.
 129          */
 130         setlocale(LC_NUMERIC, "C");
 131
 132         *sval = strtod(scale, end);
 133
 134 out:
 135         /* restore locale */
 136         setlocale(LC_NUMERIC, lc);
 137         free(lc);
 138         return ret;
 139 }
 140
 141 static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *name)
 142 {
 143         struct stat st;
 144         ssize_t sret;
 145         char scale[128];
 146         int fd, ret = -1;
 147         char path[PATH_MAX];
 148
 149         scnprintf(path, PATH_MAX, "%s/%s.scale", dir, name);
 150
 151         fd = open(path, O_RDONLY);
 152         if (fd == -1)
 153                 return -1;
 154
 155         if (fstat(fd, &st) < 0)
 156                 goto error;
 157
 158         sret = read(fd, scale, sizeof(scale)-1);
 159         if (sret < 0)
 160                 goto error;
 161
 162         if (scale[sret - 1] == '\n')
 163                 scale[sret - 1] = '\0';
 164         else
 165                 scale[sret] = '\0';
 166
 167         ret = perf_pmu__convert_scale(scale, NULL, &alias->scale);
 168 error:
 169         close(fd);
 170         return ret;
 171 }
 172
 173 static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, char *dir, char *name)
 174 {
 175         char path[PATH_MAX];
 176         ssize_t sret;
 177         int fd;
 178
 179         scnprintf(path, PATH_MAX, "%s/%s.unit", dir, name);
 180
 181         fd = open(path, O_RDONLY);
 182         if (fd == -1)
 183                 return -1;
 184
 185         sret = read(fd, alias->unit, UNIT_MAX_LEN);
 186         if (sret < 0)
 187                 goto error;
 188
 189         close(fd);
 190
 191         if (alias->unit[sret - 1] == '\n')
 192                 alias->unit[sret - 1] = '\0';
 193         else
 194                 alias->unit[sret] = '\0';
 195
 196         return 0;
 197 error:
 198         close(fd);
 199         alias->unit[0] = '\0';
 200         return -1;
 201 }
 202
 203 static int
 204 perf_pmu__parse_per_pkg(struct perf_pmu_alias *alias, char *dir, char *name)
 205 {
 206         char path[PATH_MAX];
 207         int fd;
 208
 209         scnprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, name);
 210
 211         fd = open(path, O_RDONLY);
 212         if (fd == -1)
 213                 return -1;
 214
 215         close(fd);
 216
 217         alias->per_pkg = true;
 218         return 0;
 219 }
 220
 221 static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias,
 222                                     char *dir, char *name)
 223 {
 224         char path[PATH_MAX];
 225         int fd;
 226
 227         scnprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name);
 228
 229         fd = open(path, O_RDONLY);
 230         if (fd == -1)
 231                 return -1;
 232
 233         alias->snapshot = true;
 234         close(fd);
 235         return 0;
 236 }
 237
 238 static void perf_pmu_assign_str(char *name, const char *field, char **old_str,
 239                                 char **new_str)
 240 {
 241         if (!*old_str)
 242                 goto set_new;
 243
 244         if (*new_str) { /* Have new string, check with old */
 245                 if (strcasecmp(*old_str, *new_str))
 246                         pr_debug("alias %s differs in field '%s'\n",
 247                                  name, field);
 248                 zfree(old_str);
 249         } else          /* Nothing new --> keep old string */
 250                 return;
 251 set_new:
 252         *old_str = *new_str;
 253         *new_str = NULL;
 254 }
 255
 256 static void perf_pmu_update_alias(struct perf_pmu_alias *old,
 257                                   struct perf_pmu_alias *newalias)
 258 {
 259         perf_pmu_assign_str(old->name, "desc", &old->desc, &newalias->desc);
 260         perf_pmu_assign_str(old->name, "long_desc", &old->long_desc,
 261                             &newalias->long_desc);
 262         perf_pmu_assign_str(old->name, "topic", &old->topic, &newalias->topic);
 263         perf_pmu_assign_str(old->name, "metric_expr", &old->metric_expr,
 264                             &newalias->metric_expr);
 265         perf_pmu_assign_str(old->name, "metric_name", &old->metric_name,
 266                             &newalias->metric_name);
 267         perf_pmu_assign_str(old->name, "value", &old->str, &newalias->str);
 268         old->scale = newalias->scale;
 269         old->per_pkg = newalias->per_pkg;
 270         old->snapshot = newalias->snapshot;
 271         memcpy(old->unit, newalias->unit, sizeof(old->unit));
 272 }
 273
 274 /* Delete an alias entry. */
 275 static void perf_pmu_free_alias(struct perf_pmu_alias *newalias)
 276 {
 277         zfree(&newalias->name);
 278         zfree(&newalias->desc);
 279         zfree(&newalias->long_desc);
 280         zfree(&newalias->topic);
 281         zfree(&newalias->str);
 282         zfree(&newalias->metric_expr);
 283         zfree(&newalias->metric_name);
 284         parse_events_terms__purge(&newalias->terms);
 285         free(newalias);
 286 }
 287
 288 /* Merge an alias, search in alias list. If this name is already
 289  * present merge both of them to combine all information.
 290  */
 291 static bool perf_pmu_merge_alias(struct perf_pmu_alias *newalias,
 292                                  struct list_head *alist)
 293 {
 294         struct perf_pmu_alias *a;
 295
 296         list_for_each_entry(a, alist, list) {
 297                 if (!strcasecmp(newalias->name, a->name)) {
 298                         perf_pmu_update_alias(a, newalias);
 299                         perf_pmu_free_alias(newalias);
 300                         return true;
 301                 }
 302         }
 303         return false;
 304 }
 305
 306 static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
 307                                  char *desc, char *val,
 308                                  char *long_desc, char *topic,
 309                                  char *unit, char *perpkg,
 310                                  char *metric_expr,
 311                                  char *metric_name,
 312                                  char *deprecated)
 313 {
 314         struct parse_events_term *term;
 315         struct perf_pmu_alias *alias;
 316         int ret;
 317         int num;
 318         char newval[256];
 319
 320         alias = malloc(sizeof(*alias));
 321         if (!alias)
 322                 return -ENOMEM;
 323
 324         INIT_LIST_HEAD(&alias->terms);
 325         alias->scale = 1.0;
 326         alias->unit[0] = '\0';
 327         alias->per_pkg = false;
 328         alias->snapshot = false;
 329         alias->deprecated = false;
 330
 331         ret = parse_events_terms(&alias->terms, val);
 332         if (ret) {
 333                 pr_err("Cannot parse alias %s: %d\n", val, ret);
 334                 free(alias);
 335                 return ret;
 336         }
 337
 338         /* Scan event and remove leading zeroes, spaces, newlines, some
 339          * platforms have terms specified as
 340          * event=0x0091 (read from files ../<PMU>/events/<FILE>
 341          * and terms specified as event=0x91 (read from JSON files).
 342          *
 343          * Rebuild string to make alias->str member comparable.
 344          */
 345         memset(newval, 0, sizeof(newval));
 346         ret = 0;
 347         list_for_each_entry(term, &alias->terms, list) {
 348                 if (ret)
 349                         ret += scnprintf(newval + ret, sizeof(newval) - ret,
 350                                          ",");
 351                 if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
 352                         ret += scnprintf(newval + ret, sizeof(newval) - ret,
 353                                          "%s=%#x", term->config, term->val.num);
 354                 else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
 355                         ret += scnprintf(newval + ret, sizeof(newval) - ret,
 356                                          "%s=%s", term->config, term->val.str);
 357         }
 358
 359         alias->name = strdup(name);
 360         if (dir) {
 361                 /*
 362                  * load unit name and scale if available
 363                  */
 364                 perf_pmu__parse_unit(alias, dir, name);
 365                 perf_pmu__parse_scale(alias, dir, name);
 366                 perf_pmu__parse_per_pkg(alias, dir, name);
 367                 perf_pmu__parse_snapshot(alias, dir, name);
 368         }
 369
 370         alias->metric_expr = metric_expr ? strdup(metric_expr) : NULL;
 371         alias->metric_name = metric_name ? strdup(metric_name): NULL;
 372         alias->desc = desc ? strdup(desc) : NULL;
 373         alias->long_desc = long_desc ? strdup(long_desc) :
 374                                 desc ? strdup(desc) : NULL;
 375         alias->topic = topic ? strdup(topic) : NULL;
 376         if (unit) {
 377                 if (perf_pmu__convert_scale(unit, &unit, &alias->scale) < 0)
 378                         return -1;
 379                 snprintf(alias->unit, sizeof(alias->unit), "%s", unit);
 380         }
 381         alias->per_pkg = perpkg && sscanf(perpkg, "%d", &num) == 1 && num == 1;
 382         alias->str = strdup(newval);
 383
 384         if (deprecated)
 385                 alias->deprecated = true;
 386
 387         if (!perf_pmu_merge_alias(alias, list))
 388                 list_add_tail(&alias->list, list);
 389
 390         return 0;
 391 }
 392
 393 static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
 394 {
 395         char buf[256];
 396         int ret;
 397
 398         ret = fread(buf, 1, sizeof(buf), file);
 399         if (ret == 0)
 400                 return -EINVAL;
 401
 402         buf[ret] = 0;
 403
 404         /* Remove trailing newline from sysfs file */
 405         strim(buf);
 406
 407         return __perf_pmu__new_alias(list, dir, name, NULL, buf, NULL, NULL, NULL,
 408                                      NULL, NULL, NULL, NULL);
 409 }
 410
 411 static inline bool pmu_alias_info_file(char *name)
 412 {
 413         size_t len;
 414
 415         len = strlen(name);
 416         if (len > 5 && !strcmp(name + len - 5, ".unit"))
 417                 return true;
 418         if (len > 6 && !strcmp(name + len - 6, ".scale"))
 419                 return true;
 420         if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
 421                 return true;
 422         if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
 423                 return true;
 424
 425         return false;
 426 }
 427
 428 /*
 429  * Process all the sysfs attributes located under the directory
 430  * specified in 'dir' parameter.
 431  */
 432 static int pmu_aliases_parse(char *dir, struct list_head *head)
 433 {
 434         struct dirent *evt_ent;
 435         DIR *event_dir;
 436
 437         event_dir = opendir(dir);
 438         if (!event_dir)
 439                 return -EINVAL;
 440
 441         while ((evt_ent = readdir(event_dir))) {
 442                 char path[PATH_MAX];
 443                 char *name = evt_ent->d_name;
 444                 FILE *file;
 445
 446                 if (!strcmp(name, ".") || !strcmp(name, ".."))
 447                         continue;
 448
 449                 /*
 450                  * skip info files parsed in perf_pmu__new_alias()
 451                  */
 452                 if (pmu_alias_info_file(name))
 453                         continue;
 454
 455                 scnprintf(path, PATH_MAX, "%s/%s", dir, name);
 456
 457                 file = fopen(path, "r");
 458                 if (!file) {
 459                         pr_debug("Cannot open %s\n", path);
 460                         continue;
 461                 }
 462
 463                 if (perf_pmu__new_alias(head, dir, name, file) < 0)
 464                         pr_debug("Cannot set up %s\n", name);
 465                 fclose(file);
 466         }
 467
 468         closedir(event_dir);
 469         return 0;
 470 }
 471
 472 /*
 473  * Reading the pmu event aliases definition, which should be located at:
 474  * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
 475  */
 476 static int pmu_aliases(const char *name, struct list_head *head)
 477 {
 478         char path[PATH_MAX];
 479         const char *sysfs = sysfs__mountpoint();
 480
 481         if (!sysfs)
 482                 return -1;
 483
 484         snprintf(path, PATH_MAX,
 485                  "%s/bus/event_source/devices/%s/events", sysfs, name);
 486
 487         if (!file_available(path))
 488                 return 0;
 489
 490         if (pmu_aliases_parse(path, head))
 491                 return -1;
 492
 493         return 0;
 494 }
 495
 496 static int pmu_alias_terms(struct perf_pmu_alias *alias,
 497                            struct list_head *terms)
 498 {
 499         struct parse_events_term *term, *cloned;
 500         LIST_HEAD(list);
 501         int ret;
 502
 503         list_for_each_entry(term, &alias->terms, list) {
 504                 ret = parse_events_term__clone(&cloned, term);
 505                 if (ret) {
 506                         parse_events_terms__purge(&list);
 507                         return ret;
 508                 }
 509                 /*
 510                  * Weak terms don't override command line options,
 511                  * which we don't want for implicit terms in aliases.
 512                  */
 513                 cloned->weak = true;
 514                 list_add_tail(&cloned->list, &list);
 515         }
 516         list_splice(&list, terms);
 517         return 0;
 518 }
 519
 520 /*
 521  * Reading/parsing the default pmu type value, which should be
 522  * located at:
 523  * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
 524  */
 525 static int pmu_type(const char *name, __u32 *type)
 526 {
 527         char path[PATH_MAX];
 528         FILE *file;
 529         int ret = 0;
 530         const char *sysfs = sysfs__mountpoint();
 531
 532         if (!sysfs)
 533                 return -1;
 534
 535         snprintf(path, PATH_MAX,
 536                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
 537
 538         if (access(path, R_OK) < 0)
 539                 return -1;
 540
 541         file = fopen(path, "r");
 542         if (!file)
 543                 return -EINVAL;
 544
 545         if (1 != fscanf(file, "%u", type))
 546                 ret = -1;
 547
 548         fclose(file);
 549         return ret;
 550 }
 551
 552 /* Add all pmus in sysfs to pmu list: */
 553 static void pmu_read_sysfs(void)
 554 {
 555         char path[PATH_MAX];
 556         DIR *dir;
 557         struct dirent *dent;
 558         const char *sysfs = sysfs__mountpoint();
 559
 560         if (!sysfs)
 561                 return;
 562
 563         snprintf(path, PATH_MAX,
 564                  "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
 565
 566         dir = opendir(path);
 567         if (!dir)
 568                 return;
 569
 570         while ((dent = readdir(dir))) {
 571                 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
 572                         continue;
 573                 /* add to static LIST_HEAD(pmus): */
 574                 perf_pmu__find(dent->d_name);
 575         }
 576
 577         closedir(dir);
 578 }
 579
 580 static struct perf_cpu_map *__pmu_cpumask(const char *path)
 581 {
 582         FILE *file;
 583         struct perf_cpu_map *cpus;
 584
 585         file = fopen(path, "r");
 586         if (!file)
 587                 return NULL;
 588
 589         cpus = perf_cpu_map__read(file);
 590         fclose(file);
 591         return cpus;
 592 }
 593
 594 /*
 595  * Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64)
 596  * may have a "cpus" file.
 597  */
 598 #define CPUS_TEMPLATE_UNCORE    "%s/bus/event_source/devices/%s/cpumask"
 599 #define CPUS_TEMPLATE_CPU       "%s/bus/event_source/devices/%s/cpus"
 600
 601 static struct perf_cpu_map *pmu_cpumask(const char *name)
 602 {
 603         char path[PATH_MAX];
 604         struct perf_cpu_map *cpus;
 605         const char *sysfs = sysfs__mountpoint();
 606         const char *templates[] = {
 607                 CPUS_TEMPLATE_UNCORE,
 608                 CPUS_TEMPLATE_CPU,
 609                 NULL
 610         };
 611         const char **template;
 612
 613         if (!sysfs)
 614                 return NULL;
 615
 616         for (template = templates; *template; template++) {
 617                 snprintf(path, PATH_MAX, *template, sysfs, name);
 618                 cpus = __pmu_cpumask(path);
 619                 if (cpus)
 620                         return cpus;
 621         }
 622
 623         return NULL;
 624 }
 625
 626 static bool pmu_is_uncore(const char *name)
 627 {
 628         char path[PATH_MAX];
 629         const char *sysfs;
 630
 631         sysfs = sysfs__mountpoint();
 632         snprintf(path, PATH_MAX, CPUS_TEMPLATE_UNCORE, sysfs, name);
 633         return file_available(path);
 634 }
 635
 636 /*
 637  *  PMU CORE devices have different name other than cpu in sysfs on some
 638  *  platforms.
 639  *  Looking for possible sysfs files to identify the arm core device.
 640  */
 641 static int is_arm_pmu_core(const char *name)
 642 {
 643         char path[PATH_MAX];
 644         const char *sysfs = sysfs__mountpoint();
 645
 646         if (!sysfs)
 647                 return 0;
 648
 649         /* Look for cpu sysfs (specific to arm) */
 650         scnprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/cpus",
 651                                 sysfs, name);
 652         return file_available(path);
 653 }
 654
 655 static char *perf_pmu__getcpuid(struct perf_pmu *pmu)
 656 {
 657         char *cpuid;
 658         static bool printed;
 659
 660         cpuid = getenv("PERF_CPUID");
 661         if (cpuid)
 662                 cpuid = strdup(cpuid);
 663         if (!cpuid)
 664                 cpuid = get_cpuid_str(pmu);
 665         if (!cpuid)
 666                 return NULL;
 667
 668         if (!printed) {
 669                 pr_debug("Using CPUID %s\n", cpuid);
 670                 printed = true;
 671         }
 672         return cpuid;
 673 }
 674
 675 struct pmu_events_map *perf_pmu__find_map(struct perf_pmu *pmu)
 676 {
 677         struct pmu_events_map *map;
 678         char *cpuid = perf_pmu__getcpuid(pmu);
 679         int i;
 680
 681         /* on some platforms which uses cpus map, cpuid can be NULL for
 682          * PMUs other than CORE PMUs.
 683          */
 684         if (!cpuid)
 685                 return NULL;
 686
 687         i = 0;
 688         for (;;) {
 689                 map = &pmu_events_map[i++];
 690                 if (!map->table) {
 691                         map = NULL;
 692                         break;
 693                 }
 694
 695                 if (!strcmp_cpuid_str(map->cpuid, cpuid))
 696                         break;
 697         }
 698         free(cpuid);
 699         return map;
 700 }
 701
 702 static bool pmu_uncore_alias_match(const char *pmu_name, const char *name)
 703 {
 704         char *tmp = NULL, *tok, *str;
 705         bool res;
 706
 707         str = strdup(pmu_name);
 708         if (!str)
 709                 return false;
 710
 711         /*
 712          * uncore alias may be from different PMU with common prefix
 713          */
 714         tok = strtok_r(str, ",", &tmp);
 715         if (strncmp(pmu_name, tok, strlen(tok))) {
 716                 res = false;
 717                 goto out;
 718         }
 719
 720         /*
 721          * Match more complex aliases where the alias name is a comma-delimited
 722          * list of tokens, orderly contained in the matching PMU name.
 723          *
 724          * Example: For alias "socket,pmuname" and PMU "socketX_pmunameY", we
 725          *          match "socket" in "socketX_pmunameY" and then "pmuname" in
 726          *          "pmunameY".
 727          */
 728         for (; tok; name += strlen(tok), tok = strtok_r(NULL, ",", &tmp)) {
 729                 name = strstr(name, tok);
 730                 if (!name) {
 731                         res = false;
 732                         goto out;
 733                 }
 734         }
 735
 736         res = true;
 737 out:
 738         free(str);
 739         return res;
 740 }
 741
 742 /*
 743  * From the pmu_events_map, find the table of PMU events that corresponds
 744  * to the current running CPU. Then, add all PMU events from that table
 745  * as aliases.
 746  */
 747 static void pmu_add_cpu_aliases(struct list_head *head, struct perf_pmu *pmu)
 748 {
 749         int i;
 750         struct pmu_events_map *map;
 751         const char *name = pmu->name;
 752
 753         map = perf_pmu__find_map(pmu);
 754         if (!map)
 755                 return;
 756
 757         /*
 758          * Found a matching PMU events table. Create aliases
 759          */
 760         i = 0;
 761         while (1) {
 762                 const char *cpu_name = is_arm_pmu_core(name) ? name : "cpu";
 763                 struct pmu_event *pe = &map->table[i++];
 764                 const char *pname = pe->pmu ? pe->pmu : cpu_name;
 765
 766                 if (!pe->name) {
 767                         if (pe->metric_group || pe->metric_name)
 768                                 continue;
 769                         break;
 770                 }
 771
 772                 if (pmu_is_uncore(name) &&
 773                     pmu_uncore_alias_match(pname, name))
 774                         goto new_alias;
 775
 776                 if (strcmp(pname, name))
 777                         continue;
 778
 779 new_alias:
 780                 /* need type casts to override 'const' */
 781                 __perf_pmu__new_alias(head, NULL, (char *)pe->name,
 782                                 (char *)pe->desc, (char *)pe->event,
 783                                 (char *)pe->long_desc, (char *)pe->topic,
 784                                 (char *)pe->unit, (char *)pe->perpkg,
 785                                 (char *)pe->metric_expr,
 786                                 (char *)pe->metric_name,
 787                                 (char *)pe->deprecated);
 788         }
 789 }
 790
 791 struct perf_event_attr * __weak
 792 perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
 793 {
 794         return NULL;
 795 }
 796
 797 static int pmu_max_precise(const char *name)
 798 {
 799         char path[PATH_MAX];
 800         int max_precise = -1;
 801
 802         scnprintf(path, PATH_MAX,
 803                  "bus/event_source/devices/%s/caps/max_precise",
 804                  name);
 805
 806         sysfs__read_int(path, &max_precise);
 807         return max_precise;
 808 }
 809
 810 static struct perf_pmu *pmu_lookup(const char *name)
 811 {
 812         struct perf_pmu *pmu;
 813         LIST_HEAD(format);
 814         LIST_HEAD(aliases);
 815         __u32 type;
 816
 817         /*
 818          * The pmu data we store & need consists of the pmu
 819          * type value and format definitions. Load both right
 820          * now.
 821          */
 822         if (pmu_format(name, &format))
 823                 return NULL;
 824
 825         /*
 826          * Check the type first to avoid unnecessary work.
 827          */
 828         if (pmu_type(name, &type))
 829                 return NULL;
 830
 831         if (pmu_aliases(name, &aliases))
 832                 return NULL;
 833
 834         pmu = zalloc(sizeof(*pmu));
 835         if (!pmu)
 836                 return NULL;
 837
 838         pmu->cpus = pmu_cpumask(name);
 839         pmu->name = strdup(name);
 840         pmu->type = type;
 841         pmu->is_uncore = pmu_is_uncore(name);
 842         pmu->max_precise = pmu_max_precise(name);
 843         pmu_add_cpu_aliases(&aliases, pmu);
 844
 845         INIT_LIST_HEAD(&pmu->format);
 846         INIT_LIST_HEAD(&pmu->aliases);
 847         list_splice(&format, &pmu->format);
 848         list_splice(&aliases, &pmu->aliases);
 849         list_add_tail(&pmu->list, &pmus);
 850
 851         pmu->default_config = perf_pmu__get_default_config(pmu);
 852
 853         return pmu;
 854 }
 855
 856 static struct perf_pmu *pmu_find(const char *name)
 857 {
 858         struct perf_pmu *pmu;
 859
 860         list_for_each_entry(pmu, &pmus, list)
 861                 if (!strcmp(pmu->name, name))
 862                         return pmu;
 863
 864         return NULL;
 865 }
 866
 867 struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
 868 {
 869         /*
 870          * pmu iterator: If pmu is NULL, we start at the begin,
 871          * otherwise return the next pmu. Returns NULL on end.
 872          */
 873         if (!pmu) {
 874                 pmu_read_sysfs();
 875                 pmu = list_prepare_entry(pmu, &pmus, list);
 876         }
 877         list_for_each_entry_continue(pmu, &pmus, list)
 878                 return pmu;
 879         return NULL;
 880 }
 881
 882 struct perf_pmu *perf_pmu__find(const char *name)
 883 {
 884         struct perf_pmu *pmu;
 885
 886         /*
 887          * Once PMU is loaded it stays in the list,
 888          * so we keep us from multiple reading/parsing
 889          * the pmu format definitions.
 890          */
 891         pmu = pmu_find(name);
 892         if (pmu)
 893                 return pmu;
 894
 895         return pmu_lookup(name);
 896 }
 897
 898 static struct perf_pmu_format *
 899 pmu_find_format(struct list_head *formats, const char *name)
 900 {
 901         struct perf_pmu_format *format;
 902
 903         list_for_each_entry(format, formats, list)
 904                 if (!strcmp(format->name, name))
 905                         return format;
 906
 907         return NULL;
 908 }
 909
 910 __u64 perf_pmu__format_bits(struct list_head *formats, const char *name)
 911 {
 912         struct perf_pmu_format *format = pmu_find_format(formats, name);
 913         __u64 bits = 0;
 914         int fbit;
 915
 916         if (!format)
 917                 return 0;
 918
 919         for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
 920                 bits |= 1ULL << fbit;
 921
 922         return bits;
 923 }
 924
 925 int perf_pmu__format_type(struct list_head *formats, const char *name)
 926 {
 927         struct perf_pmu_format *format = pmu_find_format(formats, name);
 928
 929         if (!format)
 930                 return -1;
 931
 932         return format->value;
 933 }
 934
 935 /*
 936  * Sets value based on the format definition (format parameter)
 937  * and unformated value (value parameter).
 938  */
 939 static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
 940                              bool zero)
 941 {
 942         unsigned long fbit, vbit;
 943
 944         for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
 945
 946                 if (!test_bit(fbit, format))
 947                         continue;
 948
 949                 if (value & (1llu << vbit++))
 950                         *v |= (1llu << fbit);
 951                 else if (zero)
 952                         *v &= ~(1llu << fbit);
 953         }
 954 }
 955
 956 static __u64 pmu_format_max_value(const unsigned long *format)
 957 {
 958         int w;
 959
 960         w = bitmap_weight(format, PERF_PMU_FORMAT_BITS);
 961         if (!w)
 962                 return 0;
 963         if (w < 64)
 964                 return (1ULL << w) - 1;
 965         return -1;
 966 }
 967
 968 /*
 969  * Term is a string term, and might be a param-term. Try to look up it's value
 970  * in the remaining terms.
 971  * - We have a term like "base-or-format-term=param-term",
 972  * - We need to find the value supplied for "param-term" (with param-term named
 973  *   in a config string) later on in the term list.
 974  */
 975 static int pmu_resolve_param_term(struct parse_events_term *term,
 976                                   struct list_head *head_terms,
 977                                   __u64 *value)
 978 {
 979         struct parse_events_term *t;
 980
 981         list_for_each_entry(t, head_terms, list) {
 982                 if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
 983                         if (!strcmp(t->config, term->config)) {
 984                                 t->used = true;
 985                                 *value = t->val.num;
 986                                 return 0;
 987                         }
 988                 }
 989         }
 990
 991         if (verbose > 0)
 992                 printf("Required parameter '%s' not specified\n", term->config);
 993
 994         return -1;
 995 }
 996
 997 static char *pmu_formats_string(struct list_head *formats)
 998 {
 999         struct perf_pmu_format *format;
1000         char *str = NULL;
1001         struct strbuf buf = STRBUF_INIT;
1002         unsigned i = 0;
1003
1004         if (!formats)
1005                 return NULL;
1006
1007         /* sysfs exported terms */
1008         list_for_each_entry(format, formats, list)
1009                 if (strbuf_addf(&buf, i++ ? ",%s" : "%s", format->name) < 0)
1010                         goto error;
1011
1012         str = strbuf_detach(&buf, NULL);
1013 error:
1014         strbuf_release(&buf);
1015
1016         return str;
1017 }
1018
1019 /*
1020  * Setup one of config[12] attr members based on the
1021  * user input data - term parameter.
1022  */
1023 static int pmu_config_term(struct list_head *formats,
1024                            struct perf_event_attr *attr,
1025                            struct parse_events_term *term,
1026                            struct list_head *head_terms,
1027                            bool zero, struct parse_events_error *err)
1028 {
1029         struct perf_pmu_format *format;
1030         __u64 *vp;
1031         __u64 val, max_val;
1032
1033         /*
1034          * If this is a parameter we've already used for parameterized-eval,
1035          * skip it in normal eval.
1036          */
1037         if (term->used)
1038                 return 0;
1039
1040         /*
1041          * Hardcoded terms should be already in, so nothing
1042          * to be done for them.
1043          */
1044         if (parse_events__is_hardcoded_term(term))
1045                 return 0;
1046
1047         format = pmu_find_format(formats, term->config);
1048         if (!format) {
1049                 if (verbose > 0)
1050                         printf("Invalid event/parameter '%s'\n", term->config);
1051                 if (err) {
1052                         char *pmu_term = pmu_formats_string(formats);
1053
1054                         parse_events__handle_error(err, term->err_term,
1055                                 strdup("unknown term"),
1056                                 parse_events_formats_error_string(pmu_term));
1057                         free(pmu_term);
1058                 }
1059                 return -EINVAL;
1060         }
1061
1062         switch (format->value) {
1063         case PERF_PMU_FORMAT_VALUE_CONFIG:
1064                 vp = &attr->config;
1065                 break;
1066         case PERF_PMU_FORMAT_VALUE_CONFIG1:
1067                 vp = &attr->config1;
1068                 break;
1069         case PERF_PMU_FORMAT_VALUE_CONFIG2:
1070                 vp = &attr->config2;
1071                 break;
1072         default:
1073                 return -EINVAL;
1074         }
1075
1076         /*
1077          * Either directly use a numeric term, or try to translate string terms
1078          * using event parameters.
1079          */
1080         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
1081                 if (term->no_value &&
1082                     bitmap_weight(format->bits, PERF_PMU_FORMAT_BITS) > 1) {
1083                         if (err) {
1084                                 parse_events__handle_error(err, term->err_val,
1085                                            strdup("no value assigned for term"),
1086                                            NULL);
1087                         }
1088                         return -EINVAL;
1089                 }
1090
1091                 val = term->val.num;
1092         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
1093                 if (strcmp(term->val.str, "?")) {
1094                         if (verbose > 0) {
1095                                 pr_info("Invalid sysfs entry %s=%s\n",
1096                                                 term->config, term->val.str);
1097                         }
1098                         if (err) {
1099                                 parse_events__handle_error(err, term->err_val,
1100                                         strdup("expected numeric value"),
1101                                         NULL);
1102                         }
1103                         return -EINVAL;
1104                 }
1105
1106                 if (pmu_resolve_param_term(term, head_terms, &val))
1107                         return -EINVAL;
1108         } else
1109                 return -EINVAL;
1110
1111         max_val = pmu_format_max_value(format->bits);
1112         if (val > max_val) {
1113                 if (err) {
1114                         char *err_str;
1115
1116                         parse_events__handle_error(err, term->err_val,
1117                                 asprintf(&err_str,
1118                                     "value too big for format, maximum is %llu",
1119                                     (unsigned long long)max_val) < 0
1120                                     ? strdup("value too big for format")
1121                                     : err_str,
1122                                     NULL);
1123                         return -EINVAL;
1124                 }
1125                 /*
1126                  * Assume we don't care if !err, in which case the value will be
1127                  * silently truncated.
1128                  */
1129         }
1130
1131         pmu_format_value(format->bits, val, vp, zero);
1132         return 0;
1133 }
1134
1135 int perf_pmu__config_terms(struct list_head *formats,
1136                            struct perf_event_attr *attr,
1137                            struct list_head *head_terms,
1138                            bool zero, struct parse_events_error *err)
1139 {
1140         struct parse_events_term *term;
1141
1142         list_for_each_entry(term, head_terms, list) {
1143                 if (pmu_config_term(formats, attr, term, head_terms,
1144                                     zero, err))
1145                         return -EINVAL;
1146         }
1147
1148         return 0;
1149 }
1150
1151 /*
1152  * Configures event's 'attr' parameter based on the:
1153  * 1) users input - specified in terms parameter
1154  * 2) pmu format definitions - specified by pmu parameter
1155  */
1156 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
1157                      struct list_head *head_terms,
1158                      struct parse_events_error *err)
1159 {
1160         bool zero = !!pmu->default_config;
1161
1162         attr->type = pmu->type;
1163         return perf_pmu__config_terms(&pmu->format, attr, head_terms,
1164                                       zero, err);
1165 }
1166
1167 static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
1168                                              struct parse_events_term *term)
1169 {
1170         struct perf_pmu_alias *alias;
1171         char *name;
1172
1173         if (parse_events__is_hardcoded_term(term))
1174                 return NULL;
1175
1176         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
1177                 if (term->val.num != 1)
1178                         return NULL;
1179                 if (pmu_find_format(&pmu->format, term->config))
1180                         return NULL;
1181                 name = term->config;
1182         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
1183                 if (strcasecmp(term->config, "event"))
1184                         return NULL;
1185                 name = term->val.str;
1186         } else {
1187                 return NULL;
1188         }
1189
1190         list_for_each_entry(alias, &pmu->aliases, list) {
1191                 if (!strcasecmp(alias->name, name))
1192                         return alias;
1193         }
1194         return NULL;
1195 }
1196
1197
1198 static int check_info_data(struct perf_pmu_alias *alias,
1199                            struct perf_pmu_info *info)
1200 {
1201         /*
1202          * Only one term in event definition can
1203          * define unit, scale and snapshot, fail
1204          * if there's more than one.
1205          */
1206         if ((info->unit && alias->unit[0]) ||
1207             (info->scale && alias->scale) ||
1208             (info->snapshot && alias->snapshot))
1209                 return -EINVAL;
1210
1211         if (alias->unit[0])
1212                 info->unit = alias->unit;
1213
1214         if (alias->scale)
1215                 info->scale = alias->scale;
1216
1217         if (alias->snapshot)
1218                 info->snapshot = alias->snapshot;
1219
1220         return 0;
1221 }
1222
1223 /*
1224  * Find alias in the terms list and replace it with the terms
1225  * defined for the alias
1226  */
1227 int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
1228                           struct perf_pmu_info *info)
1229 {
1230         struct parse_events_term *term, *h;
1231         struct perf_pmu_alias *alias;
1232         int ret;
1233
1234         info->per_pkg = false;
1235
1236         /*
1237          * Mark unit and scale as not set
1238          * (different from default values, see below)
1239          */
1240         info->unit     = NULL;
1241         info->scale    = 0.0;
1242         info->snapshot = false;
1243         info->metric_expr = NULL;
1244         info->metric_name = NULL;
1245
1246         list_for_each_entry_safe(term, h, head_terms, list) {
1247                 alias = pmu_find_alias(pmu, term);
1248                 if (!alias)
1249                         continue;
1250                 ret = pmu_alias_terms(alias, &term->list);
1251                 if (ret)
1252                         return ret;
1253
1254                 ret = check_info_data(alias, info);
1255                 if (ret)
1256                         return ret;
1257
1258                 if (alias->per_pkg)
1259                         info->per_pkg = true;
1260                 info->metric_expr = alias->metric_expr;
1261                 info->metric_name = alias->metric_name;
1262
1263                 list_del_init(&term->list);
1264                 parse_events_term__delete(term);
1265         }
1266
1267         /*
1268          * if no unit or scale foundin aliases, then
1269          * set defaults as for evsel
1270          * unit cannot left to NULL
1271          */
1272         if (info->unit == NULL)
1273                 info->unit   = "";
1274
1275         if (info->scale == 0.0)
1276                 info->scale  = 1.0;
1277
1278         return 0;
1279 }
1280
1281 int perf_pmu__new_format(struct list_head *list, char *name,
1282                          int config, unsigned long *bits)
1283 {
1284         struct perf_pmu_format *format;
1285
1286         format = zalloc(sizeof(*format));
1287         if (!format)
1288                 return -ENOMEM;
1289
1290         format->name = strdup(name);
1291         format->value = config;
1292         memcpy(format->bits, bits, sizeof(format->bits));
1293
1294         list_add_tail(&format->list, list);
1295         return 0;
1296 }
1297
1298 void perf_pmu__set_format(unsigned long *bits, long from, long to)
1299 {
1300         long b;
1301
1302         if (!to)
1303                 to = from;
1304
1305         memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
1306         for (b = from; b <= to; b++)
1307                 set_bit(b, bits);
1308 }
1309
1310 static int sub_non_neg(int a, int b)
1311 {
1312         if (b > a)
1313                 return 0;
1314         return a - b;
1315 }
1316
1317 static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
1318                           struct perf_pmu_alias *alias)
1319 {
1320         struct parse_events_term *term;
1321         int used = snprintf(buf, len, "%s/%s", pmu->name, alias->name);
1322
1323         list_for_each_entry(term, &alias->terms, list) {
1324                 if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
1325                         used += snprintf(buf + used, sub_non_neg(len, used),
1326                                         ",%s=%s", term->config,
1327                                         term->val.str);
1328         }
1329
1330         if (sub_non_neg(len, used) > 0) {
1331                 buf[used] = '/';
1332                 used++;
1333         }
1334         if (sub_non_neg(len, used) > 0) {
1335                 buf[used] = '\0';
1336                 used++;
1337         } else
1338                 buf[len - 1] = '\0';
1339
1340         return buf;
1341 }
1342
1343 static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
1344                              struct perf_pmu_alias *alias)
1345 {
1346         snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
1347         return buf;
1348 }
1349
1350 struct sevent {
1351         char *name;
1352         char *desc;
1353         char *topic;
1354         char *str;
1355         char *pmu;
1356         char *metric_expr;
1357         char *metric_name;
1358 };
1359
1360 static int cmp_sevent(const void *a, const void *b)
1361 {
1362         const struct sevent *as = a;
1363         const struct sevent *bs = b;
1364
1365         /* Put extra events last */
1366         if (!!as->desc != !!bs->desc)
1367                 return !!as->desc - !!bs->desc;
1368         if (as->topic && bs->topic) {
1369                 int n = strcmp(as->topic, bs->topic);
1370
1371                 if (n)
1372                         return n;
1373         }
1374         return strcmp(as->name, bs->name);
1375 }
1376
1377 static void wordwrap(char *s, int start, int max, int corr)
1378 {
1379         int column = start;
1380         int n;
1381
1382         while (*s) {
1383                 int wlen = strcspn(s, " \t");
1384
1385                 if (column + wlen >= max && column > start) {
1386                         printf("\n%*s", start, "");
1387                         column = start + corr;
1388                 }
1389                 n = printf("%s%.*s", column > start ? " " : "", wlen, s);
1390                 if (n <= 0)
1391                         break;
1392                 s += wlen;
1393                 column += n;
1394                 s = skip_spaces(s);
1395         }
1396 }
1397
1398 void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
1399                         bool long_desc, bool details_flag, bool deprecated)
1400 {
1401         struct perf_pmu *pmu;
1402         struct perf_pmu_alias *alias;
1403         char buf[1024];
1404         int printed = 0;
1405         int len, j;
1406         struct sevent *aliases;
1407         int numdesc = 0;
1408         int columns = pager_get_columns();
1409         char *topic = NULL;
1410
1411         pmu = NULL;
1412         len = 0;
1413         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1414                 list_for_each_entry(alias, &pmu->aliases, list)
1415                         len++;
1416                 if (pmu->selectable)
1417                         len++;
1418         }
1419         aliases = zalloc(sizeof(struct sevent) * len);
1420         if (!aliases)
1421                 goto out_enomem;
1422         pmu = NULL;
1423         j = 0;
1424         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1425                 list_for_each_entry(alias, &pmu->aliases, list) {
1426                         char *name = alias->desc ? alias->name :
1427                                 format_alias(buf, sizeof(buf), pmu, alias);
1428                         bool is_cpu = !strcmp(pmu->name, "cpu");
1429
1430                         if (alias->deprecated && !deprecated)
1431                                 continue;
1432
1433                         if (event_glob != NULL &&
1434                             !(strglobmatch_nocase(name, event_glob) ||
1435                               (!is_cpu && strglobmatch_nocase(alias->name,
1436                                                        event_glob)) ||
1437                               (alias->topic &&
1438                                strglobmatch_nocase(alias->topic, event_glob))))
1439                                 continue;
1440
1441                         if (is_cpu && !name_only && !alias->desc)
1442                                 name = format_alias_or(buf, sizeof(buf), pmu, alias);
1443
1444                         aliases[j].name = name;
1445                         if (is_cpu && !name_only && !alias->desc)
1446                                 aliases[j].name = format_alias_or(buf,
1447                                                                   sizeof(buf),
1448                                                                   pmu, alias);
1449                         aliases[j].name = strdup(aliases[j].name);
1450                         if (!aliases[j].name)
1451                                 goto out_enomem;
1452
1453                         aliases[j].desc = long_desc ? alias->long_desc :
1454                                                 alias->desc;
1455                         aliases[j].topic = alias->topic;
1456                         aliases[j].str = alias->str;
1457                         aliases[j].pmu = pmu->name;
1458                         aliases[j].metric_expr = alias->metric_expr;
1459                         aliases[j].metric_name = alias->metric_name;
1460                         j++;
1461                 }
1462                 if (pmu->selectable &&
1463                     (event_glob == NULL || strglobmatch(pmu->name, event_glob))) {
1464                         char *s;
1465                         if (asprintf(&s, "%s//", pmu->name) < 0)
1466                                 goto out_enomem;
1467                         aliases[j].name = s;
1468                         j++;
1469                 }
1470         }
1471         len = j;
1472         qsort(aliases, len, sizeof(struct sevent), cmp_sevent);
1473         for (j = 0; j < len; j++) {
1474                 /* Skip duplicates */
1475                 if (j > 0 && !strcmp(aliases[j].name, aliases[j - 1].name))
1476                         continue;
1477                 if (name_only) {
1478                         printf("%s ", aliases[j].name);
1479                         continue;
1480                 }
1481                 if (aliases[j].desc && !quiet_flag) {
1482                         if (numdesc++ == 0)
1483                                 printf("\n");
1484                         if (aliases[j].topic && (!topic ||
1485                                         strcmp(topic, aliases[j].topic))) {
1486                                 printf("%s%s:\n", topic ? "\n" : "",
1487                                                 aliases[j].topic);
1488                                 topic = aliases[j].topic;
1489                         }
1490                         printf("  %-50s\n", aliases[j].name);
1491                         printf("%*s", 8, "[");
1492                         wordwrap(aliases[j].desc, 8, columns, 0);
1493                         printf("]\n");
1494                         if (details_flag) {
1495                                 printf("%*s%s/%s/ ", 8, "", aliases[j].pmu, aliases[j].str);
1496                                 if (aliases[j].metric_name)
1497                                         printf(" MetricName: %s", aliases[j].metric_name);
1498                                 if (aliases[j].metric_expr)
1499                                         printf(" MetricExpr: %s", aliases[j].metric_expr);
1500                                 putchar('\n');
1501                         }
1502                 } else
1503                         printf("  %-50s [Kernel PMU event]\n", aliases[j].name);
1504                 printed++;
1505         }
1506         if (printed && pager_in_use())
1507                 printf("\n");
1508 out_free:
1509         for (j = 0; j < len; j++)
1510                 zfree(&aliases[j].name);
1511         zfree(&aliases);
1512         return;
1513
1514 out_enomem:
1515         printf("FATAL: not enough memory to print PMU events\n");
1516         if (aliases)
1517                 goto out_free;
1518 }
1519
1520 bool pmu_have_event(const char *pname, const char *name)
1521 {
1522         struct perf_pmu *pmu;
1523         struct perf_pmu_alias *alias;
1524
1525         pmu = NULL;
1526         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1527                 if (strcmp(pname, pmu->name))
1528                         continue;
1529                 list_for_each_entry(alias, &pmu->aliases, list)
1530                         if (!strcmp(alias->name, name))
1531                                 return true;
1532         }
1533         return false;
1534 }
1535
1536 static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
1537 {
1538         char path[PATH_MAX];
1539         const char *sysfs;
1540
1541         sysfs = sysfs__mountpoint();
1542         if (!sysfs)
1543                 return NULL;
1544
1545         snprintf(path, PATH_MAX,
1546                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/%s", sysfs, pmu->name, name);
1547         if (!file_available(path))
1548                 return NULL;
1549         return fopen(path, "r");
1550 }
1551
1552 int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
1553                         ...)
1554 {
1555         va_list args;
1556         FILE *file;
1557         int ret = EOF;
1558
1559         va_start(args, fmt);
1560         file = perf_pmu__open_file(pmu, name);
1561         if (file) {
1562                 ret = vfscanf(file, fmt, args);
1563                 fclose(file);
1564         }
1565         va_end(args);
1566         return ret;
1567 }