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 "evsel.h"
  22 #include "pmu.h"
  23 #include "parse-events.h"
  24 #include "header.h"
  25 #include "string2.h"
  26 #include "strbuf.h"
  27 #include "fncache.h"
  28
  29 struct perf_pmu perf_pmu__fake;
  30
  31 struct perf_pmu_format {
  32         char *name;
  33         int value;
  34         DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
  35         struct list_head list;
  36 };
  37
  38 int perf_pmu_parse(struct list_head *list, char *name);
  39 extern FILE *perf_pmu_in;
  40
  41 static LIST_HEAD(pmus);
  42
  43 /*
  44  * Parse & process all the sysfs attributes located under
  45  * the directory specified in 'dir' parameter.
  46  */
  47 int perf_pmu__format_parse(char *dir, struct list_head *head)
  48 {
  49         struct dirent *evt_ent;
  50         DIR *format_dir;
  51         int ret = 0;
  52
  53         format_dir = opendir(dir);
  54         if (!format_dir)
  55                 return -EINVAL;
  56
  57         while (!ret && (evt_ent = readdir(format_dir))) {
  58                 char path[PATH_MAX];
  59                 char *name = evt_ent->d_name;
  60                 FILE *file;
  61
  62                 if (!strcmp(name, ".") || !strcmp(name, ".."))
  63                         continue;
  64
  65                 snprintf(path, PATH_MAX, "%s/%s", dir, name);
  66
  67                 ret = -EINVAL;
  68                 file = fopen(path, "r");
  69                 if (!file)
  70                         break;
  71
  72                 perf_pmu_in = file;
  73                 ret = perf_pmu_parse(head, name);
  74                 fclose(file);
  75         }
  76
  77         closedir(format_dir);
  78         return ret;
  79 }
  80
  81 /*
  82  * Reading/parsing the default pmu format definition, which should be
  83  * located at:
  84  * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
  85  */
  86 static int pmu_format(const char *name, struct list_head *format)
  87 {
  88         char path[PATH_MAX];
  89         const char *sysfs = sysfs__mountpoint();
  90
  91         if (!sysfs)
  92                 return -1;
  93
  94         snprintf(path, PATH_MAX,
  95                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/format", sysfs, name);
  96
  97         if (!file_available(path))
  98                 return 0;
  99
 100         if (perf_pmu__format_parse(path, format))
 101                 return -1;
 102
 103         return 0;
 104 }
 105
 106 int perf_pmu__convert_scale(const char *scale, char **end, double *sval)
 107 {
 108         char *lc;
 109         int ret = 0;
 110
 111         /*
 112          * save current locale
 113          */
 114         lc = setlocale(LC_NUMERIC, NULL);
 115
 116         /*
 117          * The lc string may be allocated in static storage,
 118          * so get a dynamic copy to make it survive setlocale
 119          * call below.
 120          */
 121         lc = strdup(lc);
 122         if (!lc) {
 123                 ret = -ENOMEM;
 124                 goto out;
 125         }
 126
 127         /*
 128          * force to C locale to ensure kernel
 129          * scale string is converted correctly.
 130          * kernel uses default C locale.
 131          */
 132         setlocale(LC_NUMERIC, "C");
 133
 134         *sval = strtod(scale, end);
 135
 136 out:
 137         /* restore locale */
 138         setlocale(LC_NUMERIC, lc);
 139         free(lc);
 140         return ret;
 141 }
 142
 143 static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, char *dir, char *name)
 144 {
 145         struct stat st;
 146         ssize_t sret;
 147         char scale[128];
 148         int fd, ret = -1;
 149         char path[PATH_MAX];
 150
 151         scnprintf(path, PATH_MAX, "%s/%s.scale", dir, name);
 152
 153         fd = open(path, O_RDONLY);
 154         if (fd == -1)
 155                 return -1;
 156
 157         if (fstat(fd, &st) < 0)
 158                 goto error;
 159
 160         sret = read(fd, scale, sizeof(scale)-1);
 161         if (sret < 0)
 162                 goto error;
 163
 164         if (scale[sret - 1] == '\n')
 165                 scale[sret - 1] = '\0';
 166         else
 167                 scale[sret] = '\0';
 168
 169         ret = perf_pmu__convert_scale(scale, NULL, &alias->scale);
 170 error:
 171         close(fd);
 172         return ret;
 173 }
 174
 175 static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, char *dir, char *name)
 176 {
 177         char path[PATH_MAX];
 178         ssize_t sret;
 179         int fd;
 180
 181         scnprintf(path, PATH_MAX, "%s/%s.unit", dir, name);
 182
 183         fd = open(path, O_RDONLY);
 184         if (fd == -1)
 185                 return -1;
 186
 187         sret = read(fd, alias->unit, UNIT_MAX_LEN);
 188         if (sret < 0)
 189                 goto error;
 190
 191         close(fd);
 192
 193         if (alias->unit[sret - 1] == '\n')
 194                 alias->unit[sret - 1] = '\0';
 195         else
 196                 alias->unit[sret] = '\0';
 197
 198         return 0;
 199 error:
 200         close(fd);
 201         alias->unit[0] = '\0';
 202         return -1;
 203 }
 204
 205 static int
 206 perf_pmu__parse_per_pkg(struct perf_pmu_alias *alias, char *dir, char *name)
 207 {
 208         char path[PATH_MAX];
 209         int fd;
 210
 211         scnprintf(path, PATH_MAX, "%s/%s.per-pkg", dir, name);
 212
 213         fd = open(path, O_RDONLY);
 214         if (fd == -1)
 215                 return -1;
 216
 217         close(fd);
 218
 219         alias->per_pkg = true;
 220         return 0;
 221 }
 222
 223 static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias,
 224                                     char *dir, char *name)
 225 {
 226         char path[PATH_MAX];
 227         int fd;
 228
 229         scnprintf(path, PATH_MAX, "%s/%s.snapshot", dir, name);
 230
 231         fd = open(path, O_RDONLY);
 232         if (fd == -1)
 233                 return -1;
 234
 235         alias->snapshot = true;
 236         close(fd);
 237         return 0;
 238 }
 239
 240 static void perf_pmu_assign_str(char *name, const char *field, char **old_str,
 241                                 char **new_str)
 242 {
 243         if (!*old_str)
 244                 goto set_new;
 245
 246         if (*new_str) { /* Have new string, check with old */
 247                 if (strcasecmp(*old_str, *new_str))
 248                         pr_debug("alias %s differs in field '%s'\n",
 249                                  name, field);
 250                 zfree(old_str);
 251         } else          /* Nothing new --> keep old string */
 252                 return;
 253 set_new:
 254         *old_str = *new_str;
 255         *new_str = NULL;
 256 }
 257
 258 static void perf_pmu_update_alias(struct perf_pmu_alias *old,
 259                                   struct perf_pmu_alias *newalias)
 260 {
 261         perf_pmu_assign_str(old->name, "desc", &old->desc, &newalias->desc);
 262         perf_pmu_assign_str(old->name, "long_desc", &old->long_desc,
 263                             &newalias->long_desc);
 264         perf_pmu_assign_str(old->name, "topic", &old->topic, &newalias->topic);
 265         perf_pmu_assign_str(old->name, "metric_expr", &old->metric_expr,
 266                             &newalias->metric_expr);
 267         perf_pmu_assign_str(old->name, "metric_name", &old->metric_name,
 268                             &newalias->metric_name);
 269         perf_pmu_assign_str(old->name, "value", &old->str, &newalias->str);
 270         old->scale = newalias->scale;
 271         old->per_pkg = newalias->per_pkg;
 272         old->snapshot = newalias->snapshot;
 273         memcpy(old->unit, newalias->unit, sizeof(old->unit));
 274 }
 275
 276 /* Delete an alias entry. */
 277 static void perf_pmu_free_alias(struct perf_pmu_alias *newalias)
 278 {
 279         zfree(&newalias->name);
 280         zfree(&newalias->desc);
 281         zfree(&newalias->long_desc);
 282         zfree(&newalias->topic);
 283         zfree(&newalias->str);
 284         zfree(&newalias->metric_expr);
 285         zfree(&newalias->metric_name);
 286         parse_events_terms__purge(&newalias->terms);
 287         free(newalias);
 288 }
 289
 290 /* Merge an alias, search in alias list. If this name is already
 291  * present merge both of them to combine all information.
 292  */
 293 static bool perf_pmu_merge_alias(struct perf_pmu_alias *newalias,
 294                                  struct list_head *alist)
 295 {
 296         struct perf_pmu_alias *a;
 297
 298         list_for_each_entry(a, alist, list) {
 299                 if (!strcasecmp(newalias->name, a->name)) {
 300                         perf_pmu_update_alias(a, newalias);
 301                         perf_pmu_free_alias(newalias);
 302                         return true;
 303                 }
 304         }
 305         return false;
 306 }
 307
 308 static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
 309                                  char *desc, char *val,
 310                                  char *long_desc, char *topic,
 311                                  char *unit, char *perpkg,
 312                                  char *metric_expr,
 313                                  char *metric_name,
 314                                  char *deprecated)
 315 {
 316         struct parse_events_term *term;
 317         struct perf_pmu_alias *alias;
 318         int ret;
 319         int num;
 320         char newval[256];
 321
 322         alias = malloc(sizeof(*alias));
 323         if (!alias)
 324                 return -ENOMEM;
 325
 326         INIT_LIST_HEAD(&alias->terms);
 327         alias->scale = 1.0;
 328         alias->unit[0] = '\0';
 329         alias->per_pkg = false;
 330         alias->snapshot = false;
 331         alias->deprecated = false;
 332
 333         ret = parse_events_terms(&alias->terms, val);
 334         if (ret) {
 335                 pr_err("Cannot parse alias %s: %d\n", val, ret);
 336                 free(alias);
 337                 return ret;
 338         }
 339
 340         /* Scan event and remove leading zeroes, spaces, newlines, some
 341          * platforms have terms specified as
 342          * event=0x0091 (read from files ../<PMU>/events/<FILE>
 343          * and terms specified as event=0x91 (read from JSON files).
 344          *
 345          * Rebuild string to make alias->str member comparable.
 346          */
 347         memset(newval, 0, sizeof(newval));
 348         ret = 0;
 349         list_for_each_entry(term, &alias->terms, list) {
 350                 if (ret)
 351                         ret += scnprintf(newval + ret, sizeof(newval) - ret,
 352                                          ",");
 353                 if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM)
 354                         ret += scnprintf(newval + ret, sizeof(newval) - ret,
 355                                          "%s=%#x", term->config, term->val.num);
 356                 else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
 357                         ret += scnprintf(newval + ret, sizeof(newval) - ret,
 358                                          "%s=%s", term->config, term->val.str);
 359         }
 360
 361         alias->name = strdup(name);
 362         if (dir) {
 363                 /*
 364                  * load unit name and scale if available
 365                  */
 366                 perf_pmu__parse_unit(alias, dir, name);
 367                 perf_pmu__parse_scale(alias, dir, name);
 368                 perf_pmu__parse_per_pkg(alias, dir, name);
 369                 perf_pmu__parse_snapshot(alias, dir, name);
 370         }
 371
 372         alias->metric_expr = metric_expr ? strdup(metric_expr) : NULL;
 373         alias->metric_name = metric_name ? strdup(metric_name): NULL;
 374         alias->desc = desc ? strdup(desc) : NULL;
 375         alias->long_desc = long_desc ? strdup(long_desc) :
 376                                 desc ? strdup(desc) : NULL;
 377         alias->topic = topic ? strdup(topic) : NULL;
 378         if (unit) {
 379                 if (perf_pmu__convert_scale(unit, &unit, &alias->scale) < 0)
 380                         return -1;
 381                 snprintf(alias->unit, sizeof(alias->unit), "%s", unit);
 382         }
 383         alias->per_pkg = perpkg && sscanf(perpkg, "%d", &num) == 1 && num == 1;
 384         alias->str = strdup(newval);
 385
 386         if (deprecated)
 387                 alias->deprecated = true;
 388
 389         if (!perf_pmu_merge_alias(alias, list))
 390                 list_add_tail(&alias->list, list);
 391
 392         return 0;
 393 }
 394
 395 static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FILE *file)
 396 {
 397         char buf[256];
 398         int ret;
 399
 400         ret = fread(buf, 1, sizeof(buf), file);
 401         if (ret == 0)
 402                 return -EINVAL;
 403
 404         buf[ret] = 0;
 405
 406         /* Remove trailing newline from sysfs file */
 407         strim(buf);
 408
 409         return __perf_pmu__new_alias(list, dir, name, NULL, buf, NULL, NULL, NULL,
 410                                      NULL, NULL, NULL, NULL);
 411 }
 412
 413 static inline bool pmu_alias_info_file(char *name)
 414 {
 415         size_t len;
 416
 417         len = strlen(name);
 418         if (len > 5 && !strcmp(name + len - 5, ".unit"))
 419                 return true;
 420         if (len > 6 && !strcmp(name + len - 6, ".scale"))
 421                 return true;
 422         if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
 423                 return true;
 424         if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
 425                 return true;
 426
 427         return false;
 428 }
 429
 430 /*
 431  * Process all the sysfs attributes located under the directory
 432  * specified in 'dir' parameter.
 433  */
 434 static int pmu_aliases_parse(char *dir, struct list_head *head)
 435 {
 436         struct dirent *evt_ent;
 437         DIR *event_dir;
 438
 439         event_dir = opendir(dir);
 440         if (!event_dir)
 441                 return -EINVAL;
 442
 443         while ((evt_ent = readdir(event_dir))) {
 444                 char path[PATH_MAX];
 445                 char *name = evt_ent->d_name;
 446                 FILE *file;
 447
 448                 if (!strcmp(name, ".") || !strcmp(name, ".."))
 449                         continue;
 450
 451                 /*
 452                  * skip info files parsed in perf_pmu__new_alias()
 453                  */
 454                 if (pmu_alias_info_file(name))
 455                         continue;
 456
 457                 scnprintf(path, PATH_MAX, "%s/%s", dir, name);
 458
 459                 file = fopen(path, "r");
 460                 if (!file) {
 461                         pr_debug("Cannot open %s\n", path);
 462                         continue;
 463                 }
 464
 465                 if (perf_pmu__new_alias(head, dir, name, file) < 0)
 466                         pr_debug("Cannot set up %s\n", name);
 467                 fclose(file);
 468         }
 469
 470         closedir(event_dir);
 471         return 0;
 472 }
 473
 474 /*
 475  * Reading the pmu event aliases definition, which should be located at:
 476  * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
 477  */
 478 static int pmu_aliases(const char *name, struct list_head *head)
 479 {
 480         char path[PATH_MAX];
 481         const char *sysfs = sysfs__mountpoint();
 482
 483         if (!sysfs)
 484                 return -1;
 485
 486         snprintf(path, PATH_MAX,
 487                  "%s/bus/event_source/devices/%s/events", sysfs, name);
 488
 489         if (!file_available(path))
 490                 return 0;
 491
 492         if (pmu_aliases_parse(path, head))
 493                 return -1;
 494
 495         return 0;
 496 }
 497
 498 static int pmu_alias_terms(struct perf_pmu_alias *alias,
 499                            struct list_head *terms)
 500 {
 501         struct parse_events_term *term, *cloned;
 502         LIST_HEAD(list);
 503         int ret;
 504
 505         list_for_each_entry(term, &alias->terms, list) {
 506                 ret = parse_events_term__clone(&cloned, term);
 507                 if (ret) {
 508                         parse_events_terms__purge(&list);
 509                         return ret;
 510                 }
 511                 /*
 512                  * Weak terms don't override command line options,
 513                  * which we don't want for implicit terms in aliases.
 514                  */
 515                 cloned->weak = true;
 516                 list_add_tail(&cloned->list, &list);
 517         }
 518         list_splice(&list, terms);
 519         return 0;
 520 }
 521
 522 /*
 523  * Reading/parsing the default pmu type value, which should be
 524  * located at:
 525  * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
 526  */
 527 static int pmu_type(const char *name, __u32 *type)
 528 {
 529         char path[PATH_MAX];
 530         FILE *file;
 531         int ret = 0;
 532         const char *sysfs = sysfs__mountpoint();
 533
 534         if (!sysfs)
 535                 return -1;
 536
 537         snprintf(path, PATH_MAX,
 538                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/type", sysfs, name);
 539
 540         if (access(path, R_OK) < 0)
 541                 return -1;
 542
 543         file = fopen(path, "r");
 544         if (!file)
 545                 return -EINVAL;
 546
 547         if (1 != fscanf(file, "%u", type))
 548                 ret = -1;
 549
 550         fclose(file);
 551         return ret;
 552 }
 553
 554 /* Add all pmus in sysfs to pmu list: */
 555 static void pmu_read_sysfs(void)
 556 {
 557         char path[PATH_MAX];
 558         DIR *dir;
 559         struct dirent *dent;
 560         const char *sysfs = sysfs__mountpoint();
 561
 562         if (!sysfs)
 563                 return;
 564
 565         snprintf(path, PATH_MAX,
 566                  "%s" EVENT_SOURCE_DEVICE_PATH, sysfs);
 567
 568         dir = opendir(path);
 569         if (!dir)
 570                 return;
 571
 572         while ((dent = readdir(dir))) {
 573                 if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
 574                         continue;
 575                 /* add to static LIST_HEAD(pmus): */
 576                 perf_pmu__find(dent->d_name);
 577         }
 578
 579         closedir(dir);
 580 }
 581
 582 static struct perf_cpu_map *__pmu_cpumask(const char *path)
 583 {
 584         FILE *file;
 585         struct perf_cpu_map *cpus;
 586
 587         file = fopen(path, "r");
 588         if (!file)
 589                 return NULL;
 590
 591         cpus = perf_cpu_map__read(file);
 592         fclose(file);
 593         return cpus;
 594 }
 595
 596 /*
 597  * Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64)
 598  * may have a "cpus" file.
 599  */
 600 #define CPUS_TEMPLATE_UNCORE    "%s/bus/event_source/devices/%s/cpumask"
 601 #define CPUS_TEMPLATE_CPU       "%s/bus/event_source/devices/%s/cpus"
 602
 603 static struct perf_cpu_map *pmu_cpumask(const char *name)
 604 {
 605         char path[PATH_MAX];
 606         struct perf_cpu_map *cpus;
 607         const char *sysfs = sysfs__mountpoint();
 608         const char *templates[] = {
 609                 CPUS_TEMPLATE_UNCORE,
 610                 CPUS_TEMPLATE_CPU,
 611                 NULL
 612         };
 613         const char **template;
 614
 615         if (!sysfs)
 616                 return NULL;
 617
 618         for (template = templates; *template; template++) {
 619                 snprintf(path, PATH_MAX, *template, sysfs, name);
 620                 cpus = __pmu_cpumask(path);
 621                 if (cpus)
 622                         return cpus;
 623         }
 624
 625         return NULL;
 626 }
 627
 628 static bool pmu_is_uncore(const char *name)
 629 {
 630         char path[PATH_MAX];
 631         const char *sysfs;
 632
 633         sysfs = sysfs__mountpoint();
 634         snprintf(path, PATH_MAX, CPUS_TEMPLATE_UNCORE, sysfs, name);
 635         return file_available(path);
 636 }
 637
 638 /*
 639  *  PMU CORE devices have different name other than cpu in sysfs on some
 640  *  platforms.
 641  *  Looking for possible sysfs files to identify the arm core device.
 642  */
 643 static int is_arm_pmu_core(const char *name)
 644 {
 645         char path[PATH_MAX];
 646         const char *sysfs = sysfs__mountpoint();
 647
 648         if (!sysfs)
 649                 return 0;
 650
 651         /* Look for cpu sysfs (specific to arm) */
 652         scnprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/cpus",
 653                                 sysfs, name);
 654         return file_available(path);
 655 }
 656
 657 static char *perf_pmu__getcpuid(struct perf_pmu *pmu)
 658 {
 659         char *cpuid;
 660         static bool printed;
 661
 662         cpuid = getenv("PERF_CPUID");
 663         if (cpuid)
 664                 cpuid = strdup(cpuid);
 665         if (!cpuid)
 666                 cpuid = get_cpuid_str(pmu);
 667         if (!cpuid)
 668                 return NULL;
 669
 670         if (!printed) {
 671                 pr_debug("Using CPUID %s\n", cpuid);
 672                 printed = true;
 673         }
 674         return cpuid;
 675 }
 676
 677 struct pmu_events_map *perf_pmu__find_map(struct perf_pmu *pmu)
 678 {
 679         struct pmu_events_map *map;
 680         char *cpuid = perf_pmu__getcpuid(pmu);
 681         int i;
 682
 683         /* on some platforms which uses cpus map, cpuid can be NULL for
 684          * PMUs other than CORE PMUs.
 685          */
 686         if (!cpuid)
 687                 return NULL;
 688
 689         i = 0;
 690         for (;;) {
 691                 map = &pmu_events_map[i++];
 692                 if (!map->table) {
 693                         map = NULL;
 694                         break;
 695                 }
 696
 697                 if (!strcmp_cpuid_str(map->cpuid, cpuid))
 698                         break;
 699         }
 700         free(cpuid);
 701         return map;
 702 }
 703
 704 bool pmu_uncore_alias_match(const char *pmu_name, const char *name)
 705 {
 706         char *tmp = NULL, *tok, *str;
 707         bool res;
 708
 709         str = strdup(pmu_name);
 710         if (!str)
 711                 return false;
 712
 713         /*
 714          * uncore alias may be from different PMU with common prefix
 715          */
 716         tok = strtok_r(str, ",", &tmp);
 717         if (strncmp(pmu_name, tok, strlen(tok))) {
 718                 res = false;
 719                 goto out;
 720         }
 721
 722         /*
 723          * Match more complex aliases where the alias name is a comma-delimited
 724          * list of tokens, orderly contained in the matching PMU name.
 725          *
 726          * Example: For alias "socket,pmuname" and PMU "socketX_pmunameY", we
 727          *          match "socket" in "socketX_pmunameY" and then "pmuname" in
 728          *          "pmunameY".
 729          */
 730         for (; tok; name += strlen(tok), tok = strtok_r(NULL, ",", &tmp)) {
 731                 name = strstr(name, tok);
 732                 if (!name) {
 733                         res = false;
 734                         goto out;
 735                 }
 736         }
 737
 738         res = true;
 739 out:
 740         free(str);
 741         return res;
 742 }
 743
 744 /*
 745  * From the pmu_events_map, find the table of PMU events that corresponds
 746  * to the current running CPU. Then, add all PMU events from that table
 747  * as aliases.
 748  */
 749 void pmu_add_cpu_aliases_map(struct list_head *head, struct perf_pmu *pmu,
 750                              struct pmu_events_map *map)
 751 {
 752         int i;
 753         const char *name = pmu->name;
 754         /*
 755          * Found a matching PMU events table. Create aliases
 756          */
 757         i = 0;
 758         while (1) {
 759                 const char *cpu_name = is_arm_pmu_core(name) ? name : "cpu";
 760                 struct pmu_event *pe = &map->table[i++];
 761                 const char *pname = pe->pmu ? pe->pmu : cpu_name;
 762
 763                 if (!pe->name) {
 764                         if (pe->metric_group || pe->metric_name)
 765                                 continue;
 766                         break;
 767                 }
 768
 769                 if (pmu_is_uncore(name) &&
 770                     pmu_uncore_alias_match(pname, name))
 771                         goto new_alias;
 772
 773                 if (strcmp(pname, name))
 774                         continue;
 775
 776 new_alias:
 777                 /* need type casts to override 'const' */
 778                 __perf_pmu__new_alias(head, NULL, (char *)pe->name,
 779                                 (char *)pe->desc, (char *)pe->event,
 780                                 (char *)pe->long_desc, (char *)pe->topic,
 781                                 (char *)pe->unit, (char *)pe->perpkg,
 782                                 (char *)pe->metric_expr,
 783                                 (char *)pe->metric_name,
 784                                 (char *)pe->deprecated);
 785         }
 786 }
 787
 788 static void pmu_add_cpu_aliases(struct list_head *head, struct perf_pmu *pmu)
 789 {
 790         struct pmu_events_map *map;
 791
 792         map = perf_pmu__find_map(pmu);
 793         if (!map)
 794                 return;
 795
 796         pmu_add_cpu_aliases_map(head, pmu, map);
 797 }
 798
 799 struct perf_event_attr * __weak
 800 perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
 801 {
 802         return NULL;
 803 }
 804
 805 static int pmu_max_precise(const char *name)
 806 {
 807         char path[PATH_MAX];
 808         int max_precise = -1;
 809
 810         scnprintf(path, PATH_MAX,
 811                  "bus/event_source/devices/%s/caps/max_precise",
 812                  name);
 813
 814         sysfs__read_int(path, &max_precise);
 815         return max_precise;
 816 }
 817
 818 static struct perf_pmu *pmu_lookup(const char *name)
 819 {
 820         struct perf_pmu *pmu;
 821         LIST_HEAD(format);
 822         LIST_HEAD(aliases);
 823         __u32 type;
 824
 825         /*
 826          * The pmu data we store & need consists of the pmu
 827          * type value and format definitions. Load both right
 828          * now.
 829          */
 830         if (pmu_format(name, &format))
 831                 return NULL;
 832
 833         /*
 834          * Check the type first to avoid unnecessary work.
 835          */
 836         if (pmu_type(name, &type))
 837                 return NULL;
 838
 839         if (pmu_aliases(name, &aliases))
 840                 return NULL;
 841
 842         pmu = zalloc(sizeof(*pmu));
 843         if (!pmu)
 844                 return NULL;
 845
 846         pmu->cpus = pmu_cpumask(name);
 847         pmu->name = strdup(name);
 848         pmu->type = type;
 849         pmu->is_uncore = pmu_is_uncore(name);
 850         pmu->max_precise = pmu_max_precise(name);
 851         pmu_add_cpu_aliases(&aliases, pmu);
 852
 853         INIT_LIST_HEAD(&pmu->format);
 854         INIT_LIST_HEAD(&pmu->aliases);
 855         INIT_LIST_HEAD(&pmu->caps);
 856         list_splice(&format, &pmu->format);
 857         list_splice(&aliases, &pmu->aliases);
 858         list_add_tail(&pmu->list, &pmus);
 859
 860         pmu->default_config = perf_pmu__get_default_config(pmu);
 861
 862         return pmu;
 863 }
 864
 865 static struct perf_pmu *pmu_find(const char *name)
 866 {
 867         struct perf_pmu *pmu;
 868
 869         list_for_each_entry(pmu, &pmus, list)
 870                 if (!strcmp(pmu->name, name))
 871                         return pmu;
 872
 873         return NULL;
 874 }
 875
 876 struct perf_pmu *perf_pmu__find_by_type(unsigned int type)
 877 {
 878         struct perf_pmu *pmu;
 879
 880         list_for_each_entry(pmu, &pmus, list)
 881                 if (pmu->type == type)
 882                         return pmu;
 883
 884         return NULL;
 885 }
 886
 887 struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
 888 {
 889         /*
 890          * pmu iterator: If pmu is NULL, we start at the begin,
 891          * otherwise return the next pmu. Returns NULL on end.
 892          */
 893         if (!pmu) {
 894                 pmu_read_sysfs();
 895                 pmu = list_prepare_entry(pmu, &pmus, list);
 896         }
 897         list_for_each_entry_continue(pmu, &pmus, list)
 898                 return pmu;
 899         return NULL;
 900 }
 901
 902 struct perf_pmu *evsel__find_pmu(struct evsel *evsel)
 903 {
 904         struct perf_pmu *pmu = NULL;
 905
 906         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
 907                 if (pmu->type == evsel->core.attr.type)
 908                         break;
 909         }
 910
 911         return pmu;
 912 }
 913
 914 bool evsel__is_aux_event(struct evsel *evsel)
 915 {
 916         struct perf_pmu *pmu = evsel__find_pmu(evsel);
 917
 918         return pmu && pmu->auxtrace;
 919 }
 920
 921 struct perf_pmu *perf_pmu__find(const char *name)
 922 {
 923         struct perf_pmu *pmu;
 924
 925         /*
 926          * Once PMU is loaded it stays in the list,
 927          * so we keep us from multiple reading/parsing
 928          * the pmu format definitions.
 929          */
 930         pmu = pmu_find(name);
 931         if (pmu)
 932                 return pmu;
 933
 934         return pmu_lookup(name);
 935 }
 936
 937 static struct perf_pmu_format *
 938 pmu_find_format(struct list_head *formats, const char *name)
 939 {
 940         struct perf_pmu_format *format;
 941
 942         list_for_each_entry(format, formats, list)
 943                 if (!strcmp(format->name, name))
 944                         return format;
 945
 946         return NULL;
 947 }
 948
 949 __u64 perf_pmu__format_bits(struct list_head *formats, const char *name)
 950 {
 951         struct perf_pmu_format *format = pmu_find_format(formats, name);
 952         __u64 bits = 0;
 953         int fbit;
 954
 955         if (!format)
 956                 return 0;
 957
 958         for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
 959                 bits |= 1ULL << fbit;
 960
 961         return bits;
 962 }
 963
 964 int perf_pmu__format_type(struct list_head *formats, const char *name)
 965 {
 966         struct perf_pmu_format *format = pmu_find_format(formats, name);
 967
 968         if (!format)
 969                 return -1;
 970
 971         return format->value;
 972 }
 973
 974 /*
 975  * Sets value based on the format definition (format parameter)
 976  * and unformated value (value parameter).
 977  */
 978 static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
 979                              bool zero)
 980 {
 981         unsigned long fbit, vbit;
 982
 983         for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
 984
 985                 if (!test_bit(fbit, format))
 986                         continue;
 987
 988                 if (value & (1llu << vbit++))
 989                         *v |= (1llu << fbit);
 990                 else if (zero)
 991                         *v &= ~(1llu << fbit);
 992         }
 993 }
 994
 995 static __u64 pmu_format_max_value(const unsigned long *format)
 996 {
 997         int w;
 998
 999         w = bitmap_weight(format, PERF_PMU_FORMAT_BITS);
1000         if (!w)
1001                 return 0;
1002         if (w < 64)
1003                 return (1ULL << w) - 1;
1004         return -1;
1005 }
1006
1007 /*
1008  * Term is a string term, and might be a param-term. Try to look up it's value
1009  * in the remaining terms.
1010  * - We have a term like "base-or-format-term=param-term",
1011  * - We need to find the value supplied for "param-term" (with param-term named
1012  *   in a config string) later on in the term list.
1013  */
1014 static int pmu_resolve_param_term(struct parse_events_term *term,
1015                                   struct list_head *head_terms,
1016                                   __u64 *value)
1017 {
1018         struct parse_events_term *t;
1019
1020         list_for_each_entry(t, head_terms, list) {
1021                 if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM &&
1022                     t->config && !strcmp(t->config, term->config)) {
1023                         t->used = true;
1024                         *value = t->val.num;
1025                         return 0;
1026                 }
1027         }
1028
1029         if (verbose > 0)
1030                 printf("Required parameter '%s' not specified\n", term->config);
1031
1032         return -1;
1033 }
1034
1035 static char *pmu_formats_string(struct list_head *formats)
1036 {
1037         struct perf_pmu_format *format;
1038         char *str = NULL;
1039         struct strbuf buf = STRBUF_INIT;
1040         unsigned i = 0;
1041
1042         if (!formats)
1043                 return NULL;
1044
1045         /* sysfs exported terms */
1046         list_for_each_entry(format, formats, list)
1047                 if (strbuf_addf(&buf, i++ ? ",%s" : "%s", format->name) < 0)
1048                         goto error;
1049
1050         str = strbuf_detach(&buf, NULL);
1051 error:
1052         strbuf_release(&buf);
1053
1054         return str;
1055 }
1056
1057 /*
1058  * Setup one of config[12] attr members based on the
1059  * user input data - term parameter.
1060  */
1061 static int pmu_config_term(const char *pmu_name,
1062                            struct list_head *formats,
1063                            struct perf_event_attr *attr,
1064                            struct parse_events_term *term,
1065                            struct list_head *head_terms,
1066                            bool zero, struct parse_events_error *err)
1067 {
1068         struct perf_pmu_format *format;
1069         __u64 *vp;
1070         __u64 val, max_val;
1071
1072         /*
1073          * If this is a parameter we've already used for parameterized-eval,
1074          * skip it in normal eval.
1075          */
1076         if (term->used)
1077                 return 0;
1078
1079         /*
1080          * Hardcoded terms should be already in, so nothing
1081          * to be done for them.
1082          */
1083         if (parse_events__is_hardcoded_term(term))
1084                 return 0;
1085
1086         format = pmu_find_format(formats, term->config);
1087         if (!format) {
1088                 char *pmu_term = pmu_formats_string(formats);
1089                 char *unknown_term;
1090                 char *help_msg;
1091
1092                 if (asprintf(&unknown_term,
1093                                 "unknown term '%s' for pmu '%s'",
1094                                 term->config, pmu_name) < 0)
1095                         unknown_term = NULL;
1096                 help_msg = parse_events_formats_error_string(pmu_term);
1097                 if (err) {
1098                         parse_events__handle_error(err, term->err_term,
1099                                                    unknown_term,
1100                                                    help_msg);
1101                 } else {
1102                         pr_debug("%s (%s)\n", unknown_term, help_msg);
1103                         free(unknown_term);
1104                 }
1105                 free(pmu_term);
1106                 return -EINVAL;
1107         }
1108
1109         switch (format->value) {
1110         case PERF_PMU_FORMAT_VALUE_CONFIG:
1111                 vp = &attr->config;
1112                 break;
1113         case PERF_PMU_FORMAT_VALUE_CONFIG1:
1114                 vp = &attr->config1;
1115                 break;
1116         case PERF_PMU_FORMAT_VALUE_CONFIG2:
1117                 vp = &attr->config2;
1118                 break;
1119         default:
1120                 return -EINVAL;
1121         }
1122
1123         /*
1124          * Either directly use a numeric term, or try to translate string terms
1125          * using event parameters.
1126          */
1127         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
1128                 if (term->no_value &&
1129                     bitmap_weight(format->bits, PERF_PMU_FORMAT_BITS) > 1) {
1130                         if (err) {
1131                                 parse_events__handle_error(err, term->err_val,
1132                                            strdup("no value assigned for term"),
1133                                            NULL);
1134                         }
1135                         return -EINVAL;
1136                 }
1137
1138                 val = term->val.num;
1139         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
1140                 if (strcmp(term->val.str, "?")) {
1141                         if (verbose > 0) {
1142                                 pr_info("Invalid sysfs entry %s=%s\n",
1143                                                 term->config, term->val.str);
1144                         }
1145                         if (err) {
1146                                 parse_events__handle_error(err, term->err_val,
1147                                         strdup("expected numeric value"),
1148                                         NULL);
1149                         }
1150                         return -EINVAL;
1151                 }
1152
1153                 if (pmu_resolve_param_term(term, head_terms, &val))
1154                         return -EINVAL;
1155         } else
1156                 return -EINVAL;
1157
1158         max_val = pmu_format_max_value(format->bits);
1159         if (val > max_val) {
1160                 if (err) {
1161                         char *err_str;
1162
1163                         parse_events__handle_error(err, term->err_val,
1164                                 asprintf(&err_str,
1165                                     "value too big for format, maximum is %llu",
1166                                     (unsigned long long)max_val) < 0
1167                                     ? strdup("value too big for format")
1168                                     : err_str,
1169                                     NULL);
1170                         return -EINVAL;
1171                 }
1172                 /*
1173                  * Assume we don't care if !err, in which case the value will be
1174                  * silently truncated.
1175                  */
1176         }
1177
1178         pmu_format_value(format->bits, val, vp, zero);
1179         return 0;
1180 }
1181
1182 int perf_pmu__config_terms(const char *pmu_name, struct list_head *formats,
1183                            struct perf_event_attr *attr,
1184                            struct list_head *head_terms,
1185                            bool zero, struct parse_events_error *err)
1186 {
1187         struct parse_events_term *term;
1188
1189         list_for_each_entry(term, head_terms, list) {
1190                 if (pmu_config_term(pmu_name, formats, attr, term, head_terms,
1191                                     zero, err))
1192                         return -EINVAL;
1193         }
1194
1195         return 0;
1196 }
1197
1198 /*
1199  * Configures event's 'attr' parameter based on the:
1200  * 1) users input - specified in terms parameter
1201  * 2) pmu format definitions - specified by pmu parameter
1202  */
1203 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
1204                      struct list_head *head_terms,
1205                      struct parse_events_error *err)
1206 {
1207         bool zero = !!pmu->default_config;
1208
1209         attr->type = pmu->type;
1210         return perf_pmu__config_terms(pmu->name, &pmu->format, attr,
1211                                       head_terms, zero, err);
1212 }
1213
1214 static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
1215                                              struct parse_events_term *term)
1216 {
1217         struct perf_pmu_alias *alias;
1218         char *name;
1219
1220         if (parse_events__is_hardcoded_term(term))
1221                 return NULL;
1222
1223         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
1224                 if (term->val.num != 1)
1225                         return NULL;
1226                 if (pmu_find_format(&pmu->format, term->config))
1227                         return NULL;
1228                 name = term->config;
1229         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
1230                 if (strcasecmp(term->config, "event"))
1231                         return NULL;
1232                 name = term->val.str;
1233         } else {
1234                 return NULL;
1235         }
1236
1237         list_for_each_entry(alias, &pmu->aliases, list) {
1238                 if (!strcasecmp(alias->name, name))
1239                         return alias;
1240         }
1241         return NULL;
1242 }
1243
1244
1245 static int check_info_data(struct perf_pmu_alias *alias,
1246                            struct perf_pmu_info *info)
1247 {
1248         /*
1249          * Only one term in event definition can
1250          * define unit, scale and snapshot, fail
1251          * if there's more than one.
1252          */
1253         if ((info->unit && alias->unit[0]) ||
1254             (info->scale && alias->scale) ||
1255             (info->snapshot && alias->snapshot))
1256                 return -EINVAL;
1257
1258         if (alias->unit[0])
1259                 info->unit = alias->unit;
1260
1261         if (alias->scale)
1262                 info->scale = alias->scale;
1263
1264         if (alias->snapshot)
1265                 info->snapshot = alias->snapshot;
1266
1267         return 0;
1268 }
1269
1270 /*
1271  * Find alias in the terms list and replace it with the terms
1272  * defined for the alias
1273  */
1274 int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
1275                           struct perf_pmu_info *info)
1276 {
1277         struct parse_events_term *term, *h;
1278         struct perf_pmu_alias *alias;
1279         int ret;
1280
1281         info->per_pkg = false;
1282
1283         /*
1284          * Mark unit and scale as not set
1285          * (different from default values, see below)
1286          */
1287         info->unit     = NULL;
1288         info->scale    = 0.0;
1289         info->snapshot = false;
1290         info->metric_expr = NULL;
1291         info->metric_name = NULL;
1292
1293         list_for_each_entry_safe(term, h, head_terms, list) {
1294                 alias = pmu_find_alias(pmu, term);
1295                 if (!alias)
1296                         continue;
1297                 ret = pmu_alias_terms(alias, &term->list);
1298                 if (ret)
1299                         return ret;
1300
1301                 ret = check_info_data(alias, info);
1302                 if (ret)
1303                         return ret;
1304
1305                 if (alias->per_pkg)
1306                         info->per_pkg = true;
1307                 info->metric_expr = alias->metric_expr;
1308                 info->metric_name = alias->metric_name;
1309
1310                 list_del_init(&term->list);
1311                 parse_events_term__delete(term);
1312         }
1313
1314         /*
1315          * if no unit or scale foundin aliases, then
1316          * set defaults as for evsel
1317          * unit cannot left to NULL
1318          */
1319         if (info->unit == NULL)
1320                 info->unit   = "";
1321
1322         if (info->scale == 0.0)
1323                 info->scale  = 1.0;
1324
1325         return 0;
1326 }
1327
1328 int perf_pmu__new_format(struct list_head *list, char *name,
1329                          int config, unsigned long *bits)
1330 {
1331         struct perf_pmu_format *format;
1332
1333         format = zalloc(sizeof(*format));
1334         if (!format)
1335                 return -ENOMEM;
1336
1337         format->name = strdup(name);
1338         format->value = config;
1339         memcpy(format->bits, bits, sizeof(format->bits));
1340
1341         list_add_tail(&format->list, list);
1342         return 0;
1343 }
1344
1345 void perf_pmu__set_format(unsigned long *bits, long from, long to)
1346 {
1347         long b;
1348
1349         if (!to)
1350                 to = from;
1351
1352         memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
1353         for (b = from; b <= to; b++)
1354                 set_bit(b, bits);
1355 }
1356
1357 static int sub_non_neg(int a, int b)
1358 {
1359         if (b > a)
1360                 return 0;
1361         return a - b;
1362 }
1363
1364 static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
1365                           struct perf_pmu_alias *alias)
1366 {
1367         struct parse_events_term *term;
1368         int used = snprintf(buf, len, "%s/%s", pmu->name, alias->name);
1369
1370         list_for_each_entry(term, &alias->terms, list) {
1371                 if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
1372                         used += snprintf(buf + used, sub_non_neg(len, used),
1373                                         ",%s=%s", term->config,
1374                                         term->val.str);
1375         }
1376
1377         if (sub_non_neg(len, used) > 0) {
1378                 buf[used] = '/';
1379                 used++;
1380         }
1381         if (sub_non_neg(len, used) > 0) {
1382                 buf[used] = '\0';
1383                 used++;
1384         } else
1385                 buf[len - 1] = '\0';
1386
1387         return buf;
1388 }
1389
1390 static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
1391                              struct perf_pmu_alias *alias)
1392 {
1393         snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
1394         return buf;
1395 }
1396
1397 struct sevent {
1398         char *name;
1399         char *desc;
1400         char *topic;
1401         char *str;
1402         char *pmu;
1403         char *metric_expr;
1404         char *metric_name;
1405 };
1406
1407 static int cmp_sevent(const void *a, const void *b)
1408 {
1409         const struct sevent *as = a;
1410         const struct sevent *bs = b;
1411
1412         /* Put extra events last */
1413         if (!!as->desc != !!bs->desc)
1414                 return !!as->desc - !!bs->desc;
1415         if (as->topic && bs->topic) {
1416                 int n = strcmp(as->topic, bs->topic);
1417
1418                 if (n)
1419                         return n;
1420         }
1421         return strcmp(as->name, bs->name);
1422 }
1423
1424 static void wordwrap(char *s, int start, int max, int corr)
1425 {
1426         int column = start;
1427         int n;
1428
1429         while (*s) {
1430                 int wlen = strcspn(s, " \t");
1431
1432                 if (column + wlen >= max && column > start) {
1433                         printf("\n%*s", start, "");
1434                         column = start + corr;
1435                 }
1436                 n = printf("%s%.*s", column > start ? " " : "", wlen, s);
1437                 if (n <= 0)
1438                         break;
1439                 s += wlen;
1440                 column += n;
1441                 s = skip_spaces(s);
1442         }
1443 }
1444
1445 bool is_pmu_core(const char *name)
1446 {
1447         return !strcmp(name, "cpu") || is_arm_pmu_core(name);
1448 }
1449
1450 void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
1451                         bool long_desc, bool details_flag, bool deprecated)
1452 {
1453         struct perf_pmu *pmu;
1454         struct perf_pmu_alias *alias;
1455         char buf[1024];
1456         int printed = 0;
1457         int len, j;
1458         struct sevent *aliases;
1459         int numdesc = 0;
1460         int columns = pager_get_columns();
1461         char *topic = NULL;
1462
1463         pmu = NULL;
1464         len = 0;
1465         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1466                 list_for_each_entry(alias, &pmu->aliases, list)
1467                         len++;
1468                 if (pmu->selectable)
1469                         len++;
1470         }
1471         aliases = zalloc(sizeof(struct sevent) * len);
1472         if (!aliases)
1473                 goto out_enomem;
1474         pmu = NULL;
1475         j = 0;
1476         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1477                 list_for_each_entry(alias, &pmu->aliases, list) {
1478                         char *name = alias->desc ? alias->name :
1479                                 format_alias(buf, sizeof(buf), pmu, alias);
1480                         bool is_cpu = !strcmp(pmu->name, "cpu");
1481
1482                         if (alias->deprecated && !deprecated)
1483                                 continue;
1484
1485                         if (event_glob != NULL &&
1486                             !(strglobmatch_nocase(name, event_glob) ||
1487                               (!is_cpu && strglobmatch_nocase(alias->name,
1488                                                        event_glob)) ||
1489                               (alias->topic &&
1490                                strglobmatch_nocase(alias->topic, event_glob))))
1491                                 continue;
1492
1493                         if (is_cpu && !name_only && !alias->desc)
1494                                 name = format_alias_or(buf, sizeof(buf), pmu, alias);
1495
1496                         aliases[j].name = name;
1497                         if (is_cpu && !name_only && !alias->desc)
1498                                 aliases[j].name = format_alias_or(buf,
1499                                                                   sizeof(buf),
1500                                                                   pmu, alias);
1501                         aliases[j].name = strdup(aliases[j].name);
1502                         if (!aliases[j].name)
1503                                 goto out_enomem;
1504
1505                         aliases[j].desc = long_desc ? alias->long_desc :
1506                                                 alias->desc;
1507                         aliases[j].topic = alias->topic;
1508                         aliases[j].str = alias->str;
1509                         aliases[j].pmu = pmu->name;
1510                         aliases[j].metric_expr = alias->metric_expr;
1511                         aliases[j].metric_name = alias->metric_name;
1512                         j++;
1513                 }
1514                 if (pmu->selectable &&
1515                     (event_glob == NULL || strglobmatch(pmu->name, event_glob))) {
1516                         char *s;
1517                         if (asprintf(&s, "%s//", pmu->name) < 0)
1518                                 goto out_enomem;
1519                         aliases[j].name = s;
1520                         j++;
1521                 }
1522         }
1523         len = j;
1524         qsort(aliases, len, sizeof(struct sevent), cmp_sevent);
1525         for (j = 0; j < len; j++) {
1526                 /* Skip duplicates */
1527                 if (j > 0 && !strcmp(aliases[j].name, aliases[j - 1].name))
1528                         continue;
1529                 if (name_only) {
1530                         printf("%s ", aliases[j].name);
1531                         continue;
1532                 }
1533                 if (aliases[j].desc && !quiet_flag) {
1534                         if (numdesc++ == 0)
1535                                 printf("\n");
1536                         if (aliases[j].topic && (!topic ||
1537                                         strcmp(topic, aliases[j].topic))) {
1538                                 printf("%s%s:\n", topic ? "\n" : "",
1539                                                 aliases[j].topic);
1540                                 topic = aliases[j].topic;
1541                         }
1542                         printf("  %-50s\n", aliases[j].name);
1543                         printf("%*s", 8, "[");
1544                         wordwrap(aliases[j].desc, 8, columns, 0);
1545                         printf("]\n");
1546                         if (details_flag) {
1547                                 printf("%*s%s/%s/ ", 8, "", aliases[j].pmu, aliases[j].str);
1548                                 if (aliases[j].metric_name)
1549                                         printf(" MetricName: %s", aliases[j].metric_name);
1550                                 if (aliases[j].metric_expr)
1551                                         printf(" MetricExpr: %s", aliases[j].metric_expr);
1552                                 putchar('\n');
1553                         }
1554                 } else
1555                         printf("  %-50s [Kernel PMU event]\n", aliases[j].name);
1556                 printed++;
1557         }
1558         if (printed && pager_in_use())
1559                 printf("\n");
1560 out_free:
1561         for (j = 0; j < len; j++)
1562                 zfree(&aliases[j].name);
1563         zfree(&aliases);
1564         return;
1565
1566 out_enomem:
1567         printf("FATAL: not enough memory to print PMU events\n");
1568         if (aliases)
1569                 goto out_free;
1570 }
1571
1572 bool pmu_have_event(const char *pname, const char *name)
1573 {
1574         struct perf_pmu *pmu;
1575         struct perf_pmu_alias *alias;
1576
1577         pmu = NULL;
1578         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1579                 if (strcmp(pname, pmu->name))
1580                         continue;
1581                 list_for_each_entry(alias, &pmu->aliases, list)
1582                         if (!strcmp(alias->name, name))
1583                                 return true;
1584         }
1585         return false;
1586 }
1587
1588 static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
1589 {
1590         char path[PATH_MAX];
1591         const char *sysfs;
1592
1593         sysfs = sysfs__mountpoint();
1594         if (!sysfs)
1595                 return NULL;
1596
1597         snprintf(path, PATH_MAX,
1598                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/%s", sysfs, pmu->name, name);
1599         if (!file_available(path))
1600                 return NULL;
1601         return fopen(path, "r");
1602 }
1603
1604 int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
1605                         ...)
1606 {
1607         va_list args;
1608         FILE *file;
1609         int ret = EOF;
1610
1611         va_start(args, fmt);
1612         file = perf_pmu__open_file(pmu, name);
1613         if (file) {
1614                 ret = vfscanf(file, fmt, args);
1615                 fclose(file);
1616         }
1617         va_end(args);
1618         return ret;
1619 }
1620
1621 static int perf_pmu__new_caps(struct list_head *list, char *name, char *value)
1622 {
1623         struct perf_pmu_caps *caps = zalloc(sizeof(*caps));
1624
1625         if (!caps)
1626                 return -ENOMEM;
1627
1628         caps->name = strdup(name);
1629         if (!caps->name)
1630                 goto free_caps;
1631         caps->value = strndup(value, strlen(value) - 1);
1632         if (!caps->value)
1633                 goto free_name;
1634         list_add_tail(&caps->list, list);
1635         return 0;
1636
1637 free_name:
1638         zfree(caps->name);
1639 free_caps:
1640         free(caps);
1641
1642         return -ENOMEM;
1643 }
1644
1645 /*
1646  * Reading/parsing the given pmu capabilities, which should be located at:
1647  * /sys/bus/event_source/devices/<dev>/caps as sysfs group attributes.
1648  * Return the number of capabilities
1649  */
1650 int perf_pmu__caps_parse(struct perf_pmu *pmu)
1651 {
1652         struct stat st;
1653         char caps_path[PATH_MAX];
1654         const char *sysfs = sysfs__mountpoint();
1655         DIR *caps_dir;
1656         struct dirent *evt_ent;
1657         int nr_caps = 0;
1658
1659         if (!sysfs)
1660                 return -1;
1661
1662         snprintf(caps_path, PATH_MAX,
1663                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/caps", sysfs, pmu->name);
1664
1665         if (stat(caps_path, &st) < 0)
1666                 return 0;       /* no error if caps does not exist */
1667
1668         caps_dir = opendir(caps_path);
1669         if (!caps_dir)
1670                 return -EINVAL;
1671
1672         while ((evt_ent = readdir(caps_dir)) != NULL) {
1673                 char path[PATH_MAX + NAME_MAX + 1];
1674                 char *name = evt_ent->d_name;
1675                 char value[128];
1676                 FILE *file;
1677
1678                 if (!strcmp(name, ".") || !strcmp(name, ".."))
1679                         continue;
1680
1681                 snprintf(path, sizeof(path), "%s/%s", caps_path, name);
1682
1683                 file = fopen(path, "r");
1684                 if (!file)
1685                         continue;
1686
1687                 if (!fgets(value, sizeof(value), file) ||
1688                     (perf_pmu__new_caps(&pmu->caps, name, value) < 0)) {
1689                         fclose(file);
1690                         continue;
1691                 }
1692
1693                 nr_caps++;
1694                 fclose(file);
1695         }
1696
1697         closedir(caps_dir);
1698
1699         return nr_caps;
1700 }