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 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 SYS_TEMPLATE_ID "./bus/event_source/devices/%s/identifier"
 601 #define CPUS_TEMPLATE_UNCORE    "%s/bus/event_source/devices/%s/cpumask"
 602 #define CPUS_TEMPLATE_CPU       "%s/bus/event_source/devices/%s/cpus"
 603
 604 static struct perf_cpu_map *pmu_cpumask(const char *name)
 605 {
 606         char path[PATH_MAX];
 607         struct perf_cpu_map *cpus;
 608         const char *sysfs = sysfs__mountpoint();
 609         const char *templates[] = {
 610                 CPUS_TEMPLATE_UNCORE,
 611                 CPUS_TEMPLATE_CPU,
 612                 NULL
 613         };
 614         const char **template;
 615
 616         if (!sysfs)
 617                 return NULL;
 618
 619         for (template = templates; *template; template++) {
 620                 snprintf(path, PATH_MAX, *template, sysfs, name);
 621                 cpus = __pmu_cpumask(path);
 622                 if (cpus)
 623                         return cpus;
 624         }
 625
 626         return NULL;
 627 }
 628
 629 static bool pmu_is_uncore(const char *name)
 630 {
 631         char path[PATH_MAX];
 632         const char *sysfs;
 633
 634         sysfs = sysfs__mountpoint();
 635         snprintf(path, PATH_MAX, CPUS_TEMPLATE_UNCORE, sysfs, name);
 636         return file_available(path);
 637 }
 638
 639 static char *pmu_id(const char *name)
 640 {
 641         char path[PATH_MAX], *str;
 642         size_t len;
 643
 644         snprintf(path, PATH_MAX, SYS_TEMPLATE_ID, name);
 645
 646         if (sysfs__read_str(path, &str, &len) < 0)
 647                 return NULL;
 648
 649         str[len - 1] = 0; /* remove line feed */
 650
 651         return str;
 652 }
 653
 654 /*
 655  *  PMU CORE devices have different name other than cpu in sysfs on some
 656  *  platforms.
 657  *  Looking for possible sysfs files to identify the arm core device.
 658  */
 659 static int is_arm_pmu_core(const char *name)
 660 {
 661         char path[PATH_MAX];
 662         const char *sysfs = sysfs__mountpoint();
 663
 664         if (!sysfs)
 665                 return 0;
 666
 667         /* Look for cpu sysfs (specific to arm) */
 668         scnprintf(path, PATH_MAX, "%s/bus/event_source/devices/%s/cpus",
 669                                 sysfs, name);
 670         return file_available(path);
 671 }
 672
 673 static char *perf_pmu__getcpuid(struct perf_pmu *pmu)
 674 {
 675         char *cpuid;
 676         static bool printed;
 677
 678         cpuid = getenv("PERF_CPUID");
 679         if (cpuid)
 680                 cpuid = strdup(cpuid);
 681         if (!cpuid)
 682                 cpuid = get_cpuid_str(pmu);
 683         if (!cpuid)
 684                 return NULL;
 685
 686         if (!printed) {
 687                 pr_debug("Using CPUID %s\n", cpuid);
 688                 printed = true;
 689         }
 690         return cpuid;
 691 }
 692
 693 struct pmu_events_map *perf_pmu__find_map(struct perf_pmu *pmu)
 694 {
 695         struct pmu_events_map *map;
 696         char *cpuid = perf_pmu__getcpuid(pmu);
 697         int i;
 698
 699         /* on some platforms which uses cpus map, cpuid can be NULL for
 700          * PMUs other than CORE PMUs.
 701          */
 702         if (!cpuid)
 703                 return NULL;
 704
 705         i = 0;
 706         for (;;) {
 707                 map = &pmu_events_map[i++];
 708                 if (!map->table) {
 709                         map = NULL;
 710                         break;
 711                 }
 712
 713                 if (!strcmp_cpuid_str(map->cpuid, cpuid))
 714                         break;
 715         }
 716         free(cpuid);
 717         return map;
 718 }
 719
 720 bool pmu_uncore_alias_match(const char *pmu_name, const char *name)
 721 {
 722         char *tmp = NULL, *tok, *str;
 723         bool res;
 724
 725         str = strdup(pmu_name);
 726         if (!str)
 727                 return false;
 728
 729         /*
 730          * uncore alias may be from different PMU with common prefix
 731          */
 732         tok = strtok_r(str, ",", &tmp);
 733         if (strncmp(pmu_name, tok, strlen(tok))) {
 734                 res = false;
 735                 goto out;
 736         }
 737
 738         /*
 739          * Match more complex aliases where the alias name is a comma-delimited
 740          * list of tokens, orderly contained in the matching PMU name.
 741          *
 742          * Example: For alias "socket,pmuname" and PMU "socketX_pmunameY", we
 743          *          match "socket" in "socketX_pmunameY" and then "pmuname" in
 744          *          "pmunameY".
 745          */
 746         for (; tok; name += strlen(tok), tok = strtok_r(NULL, ",", &tmp)) {
 747                 name = strstr(name, tok);
 748                 if (!name) {
 749                         res = false;
 750                         goto out;
 751                 }
 752         }
 753
 754         res = true;
 755 out:
 756         free(str);
 757         return res;
 758 }
 759
 760 /*
 761  * From the pmu_events_map, find the table of PMU events that corresponds
 762  * to the current running CPU. Then, add all PMU events from that table
 763  * as aliases.
 764  */
 765 void pmu_add_cpu_aliases_map(struct list_head *head, struct perf_pmu *pmu,
 766                              struct pmu_events_map *map)
 767 {
 768         int i;
 769         const char *name = pmu->name;
 770         /*
 771          * Found a matching PMU events table. Create aliases
 772          */
 773         i = 0;
 774         while (1) {
 775                 const char *cpu_name = is_arm_pmu_core(name) ? name : "cpu";
 776                 struct pmu_event *pe = &map->table[i++];
 777                 const char *pname = pe->pmu ? pe->pmu : cpu_name;
 778
 779                 if (!pe->name) {
 780                         if (pe->metric_group || pe->metric_name)
 781                                 continue;
 782                         break;
 783                 }
 784
 785                 if (pmu_is_uncore(name) &&
 786                     pmu_uncore_alias_match(pname, name))
 787                         goto new_alias;
 788
 789                 if (strcmp(pname, name))
 790                         continue;
 791
 792 new_alias:
 793                 /* need type casts to override 'const' */
 794                 __perf_pmu__new_alias(head, NULL, (char *)pe->name,
 795                                 (char *)pe->desc, (char *)pe->event,
 796                                 (char *)pe->long_desc, (char *)pe->topic,
 797                                 (char *)pe->unit, (char *)pe->perpkg,
 798                                 (char *)pe->metric_expr,
 799                                 (char *)pe->metric_name,
 800                                 (char *)pe->deprecated);
 801         }
 802 }
 803
 804 static void pmu_add_cpu_aliases(struct list_head *head, struct perf_pmu *pmu)
 805 {
 806         struct pmu_events_map *map;
 807
 808         map = perf_pmu__find_map(pmu);
 809         if (!map)
 810                 return;
 811
 812         pmu_add_cpu_aliases_map(head, pmu, map);
 813 }
 814
 815 struct perf_event_attr * __weak
 816 perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
 817 {
 818         return NULL;
 819 }
 820
 821 static int pmu_max_precise(const char *name)
 822 {
 823         char path[PATH_MAX];
 824         int max_precise = -1;
 825
 826         scnprintf(path, PATH_MAX,
 827                  "bus/event_source/devices/%s/caps/max_precise",
 828                  name);
 829
 830         sysfs__read_int(path, &max_precise);
 831         return max_precise;
 832 }
 833
 834 static struct perf_pmu *pmu_lookup(const char *name)
 835 {
 836         struct perf_pmu *pmu;
 837         LIST_HEAD(format);
 838         LIST_HEAD(aliases);
 839         __u32 type;
 840
 841         /*
 842          * The pmu data we store & need consists of the pmu
 843          * type value and format definitions. Load both right
 844          * now.
 845          */
 846         if (pmu_format(name, &format))
 847                 return NULL;
 848
 849         /*
 850          * Check the type first to avoid unnecessary work.
 851          */
 852         if (pmu_type(name, &type))
 853                 return NULL;
 854
 855         if (pmu_aliases(name, &aliases))
 856                 return NULL;
 857
 858         pmu = zalloc(sizeof(*pmu));
 859         if (!pmu)
 860                 return NULL;
 861
 862         pmu->cpus = pmu_cpumask(name);
 863         pmu->name = strdup(name);
 864         pmu->type = type;
 865         pmu->is_uncore = pmu_is_uncore(name);
 866         if (pmu->is_uncore)
 867                 pmu->id = pmu_id(name);
 868         pmu->max_precise = pmu_max_precise(name);
 869         pmu_add_cpu_aliases(&aliases, pmu);
 870
 871         INIT_LIST_HEAD(&pmu->format);
 872         INIT_LIST_HEAD(&pmu->aliases);
 873         INIT_LIST_HEAD(&pmu->caps);
 874         list_splice(&format, &pmu->format);
 875         list_splice(&aliases, &pmu->aliases);
 876         list_add_tail(&pmu->list, &pmus);
 877
 878         pmu->default_config = perf_pmu__get_default_config(pmu);
 879
 880         return pmu;
 881 }
 882
 883 static struct perf_pmu *pmu_find(const char *name)
 884 {
 885         struct perf_pmu *pmu;
 886
 887         list_for_each_entry(pmu, &pmus, list)
 888                 if (!strcmp(pmu->name, name))
 889                         return pmu;
 890
 891         return NULL;
 892 }
 893
 894 struct perf_pmu *perf_pmu__find_by_type(unsigned int type)
 895 {
 896         struct perf_pmu *pmu;
 897
 898         list_for_each_entry(pmu, &pmus, list)
 899                 if (pmu->type == type)
 900                         return pmu;
 901
 902         return NULL;
 903 }
 904
 905 struct perf_pmu *perf_pmu__scan(struct perf_pmu *pmu)
 906 {
 907         /*
 908          * pmu iterator: If pmu is NULL, we start at the begin,
 909          * otherwise return the next pmu. Returns NULL on end.
 910          */
 911         if (!pmu) {
 912                 pmu_read_sysfs();
 913                 pmu = list_prepare_entry(pmu, &pmus, list);
 914         }
 915         list_for_each_entry_continue(pmu, &pmus, list)
 916                 return pmu;
 917         return NULL;
 918 }
 919
 920 struct perf_pmu *evsel__find_pmu(struct evsel *evsel)
 921 {
 922         struct perf_pmu *pmu = NULL;
 923
 924         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
 925                 if (pmu->type == evsel->core.attr.type)
 926                         break;
 927         }
 928
 929         return pmu;
 930 }
 931
 932 bool evsel__is_aux_event(struct evsel *evsel)
 933 {
 934         struct perf_pmu *pmu = evsel__find_pmu(evsel);
 935
 936         return pmu && pmu->auxtrace;
 937 }
 938
 939 struct perf_pmu *perf_pmu__find(const char *name)
 940 {
 941         struct perf_pmu *pmu;
 942
 943         /*
 944          * Once PMU is loaded it stays in the list,
 945          * so we keep us from multiple reading/parsing
 946          * the pmu format definitions.
 947          */
 948         pmu = pmu_find(name);
 949         if (pmu)
 950                 return pmu;
 951
 952         return pmu_lookup(name);
 953 }
 954
 955 static struct perf_pmu_format *
 956 pmu_find_format(struct list_head *formats, const char *name)
 957 {
 958         struct perf_pmu_format *format;
 959
 960         list_for_each_entry(format, formats, list)
 961                 if (!strcmp(format->name, name))
 962                         return format;
 963
 964         return NULL;
 965 }
 966
 967 __u64 perf_pmu__format_bits(struct list_head *formats, const char *name)
 968 {
 969         struct perf_pmu_format *format = pmu_find_format(formats, name);
 970         __u64 bits = 0;
 971         int fbit;
 972
 973         if (!format)
 974                 return 0;
 975
 976         for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
 977                 bits |= 1ULL << fbit;
 978
 979         return bits;
 980 }
 981
 982 int perf_pmu__format_type(struct list_head *formats, const char *name)
 983 {
 984         struct perf_pmu_format *format = pmu_find_format(formats, name);
 985
 986         if (!format)
 987                 return -1;
 988
 989         return format->value;
 990 }
 991
 992 /*
 993  * Sets value based on the format definition (format parameter)
 994  * and unformated value (value parameter).
 995  */
 996 static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
 997                              bool zero)
 998 {
 999         unsigned long fbit, vbit;
1000
1001         for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
1002
1003                 if (!test_bit(fbit, format))
1004                         continue;
1005
1006                 if (value & (1llu << vbit++))
1007                         *v |= (1llu << fbit);
1008                 else if (zero)
1009                         *v &= ~(1llu << fbit);
1010         }
1011 }
1012
1013 static __u64 pmu_format_max_value(const unsigned long *format)
1014 {
1015         int w;
1016
1017         w = bitmap_weight(format, PERF_PMU_FORMAT_BITS);
1018         if (!w)
1019                 return 0;
1020         if (w < 64)
1021                 return (1ULL << w) - 1;
1022         return -1;
1023 }
1024
1025 /*
1026  * Term is a string term, and might be a param-term. Try to look up it's value
1027  * in the remaining terms.
1028  * - We have a term like "base-or-format-term=param-term",
1029  * - We need to find the value supplied for "param-term" (with param-term named
1030  *   in a config string) later on in the term list.
1031  */
1032 static int pmu_resolve_param_term(struct parse_events_term *term,
1033                                   struct list_head *head_terms,
1034                                   __u64 *value)
1035 {
1036         struct parse_events_term *t;
1037
1038         list_for_each_entry(t, head_terms, list) {
1039                 if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM &&
1040                     t->config && !strcmp(t->config, term->config)) {
1041                         t->used = true;
1042                         *value = t->val.num;
1043                         return 0;
1044                 }
1045         }
1046
1047         if (verbose > 0)
1048                 printf("Required parameter '%s' not specified\n", term->config);
1049
1050         return -1;
1051 }
1052
1053 static char *pmu_formats_string(struct list_head *formats)
1054 {
1055         struct perf_pmu_format *format;
1056         char *str = NULL;
1057         struct strbuf buf = STRBUF_INIT;
1058         unsigned i = 0;
1059
1060         if (!formats)
1061                 return NULL;
1062
1063         /* sysfs exported terms */
1064         list_for_each_entry(format, formats, list)
1065                 if (strbuf_addf(&buf, i++ ? ",%s" : "%s", format->name) < 0)
1066                         goto error;
1067
1068         str = strbuf_detach(&buf, NULL);
1069 error:
1070         strbuf_release(&buf);
1071
1072         return str;
1073 }
1074
1075 /*
1076  * Setup one of config[12] attr members based on the
1077  * user input data - term parameter.
1078  */
1079 static int pmu_config_term(const char *pmu_name,
1080                            struct list_head *formats,
1081                            struct perf_event_attr *attr,
1082                            struct parse_events_term *term,
1083                            struct list_head *head_terms,
1084                            bool zero, struct parse_events_error *err)
1085 {
1086         struct perf_pmu_format *format;
1087         __u64 *vp;
1088         __u64 val, max_val;
1089
1090         /*
1091          * If this is a parameter we've already used for parameterized-eval,
1092          * skip it in normal eval.
1093          */
1094         if (term->used)
1095                 return 0;
1096
1097         /*
1098          * Hardcoded terms should be already in, so nothing
1099          * to be done for them.
1100          */
1101         if (parse_events__is_hardcoded_term(term))
1102                 return 0;
1103
1104         format = pmu_find_format(formats, term->config);
1105         if (!format) {
1106                 char *pmu_term = pmu_formats_string(formats);
1107                 char *unknown_term;
1108                 char *help_msg;
1109
1110                 if (asprintf(&unknown_term,
1111                                 "unknown term '%s' for pmu '%s'",
1112                                 term->config, pmu_name) < 0)
1113                         unknown_term = NULL;
1114                 help_msg = parse_events_formats_error_string(pmu_term);
1115                 if (err) {
1116                         parse_events__handle_error(err, term->err_term,
1117                                                    unknown_term,
1118                                                    help_msg);
1119                 } else {
1120                         pr_debug("%s (%s)\n", unknown_term, help_msg);
1121                         free(unknown_term);
1122                 }
1123                 free(pmu_term);
1124                 return -EINVAL;
1125         }
1126
1127         switch (format->value) {
1128         case PERF_PMU_FORMAT_VALUE_CONFIG:
1129                 vp = &attr->config;
1130                 break;
1131         case PERF_PMU_FORMAT_VALUE_CONFIG1:
1132                 vp = &attr->config1;
1133                 break;
1134         case PERF_PMU_FORMAT_VALUE_CONFIG2:
1135                 vp = &attr->config2;
1136                 break;
1137         default:
1138                 return -EINVAL;
1139         }
1140
1141         /*
1142          * Either directly use a numeric term, or try to translate string terms
1143          * using event parameters.
1144          */
1145         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
1146                 if (term->no_value &&
1147                     bitmap_weight(format->bits, PERF_PMU_FORMAT_BITS) > 1) {
1148                         if (err) {
1149                                 parse_events__handle_error(err, term->err_val,
1150                                            strdup("no value assigned for term"),
1151                                            NULL);
1152                         }
1153                         return -EINVAL;
1154                 }
1155
1156                 val = term->val.num;
1157         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
1158                 if (strcmp(term->val.str, "?")) {
1159                         if (verbose > 0) {
1160                                 pr_info("Invalid sysfs entry %s=%s\n",
1161                                                 term->config, term->val.str);
1162                         }
1163                         if (err) {
1164                                 parse_events__handle_error(err, term->err_val,
1165                                         strdup("expected numeric value"),
1166                                         NULL);
1167                         }
1168                         return -EINVAL;
1169                 }
1170
1171                 if (pmu_resolve_param_term(term, head_terms, &val))
1172                         return -EINVAL;
1173         } else
1174                 return -EINVAL;
1175
1176         max_val = pmu_format_max_value(format->bits);
1177         if (val > max_val) {
1178                 if (err) {
1179                         char *err_str;
1180
1181                         parse_events__handle_error(err, term->err_val,
1182                                 asprintf(&err_str,
1183                                     "value too big for format, maximum is %llu",
1184                                     (unsigned long long)max_val) < 0
1185                                     ? strdup("value too big for format")
1186                                     : err_str,
1187                                     NULL);
1188                         return -EINVAL;
1189                 }
1190                 /*
1191                  * Assume we don't care if !err, in which case the value will be
1192                  * silently truncated.
1193                  */
1194         }
1195
1196         pmu_format_value(format->bits, val, vp, zero);
1197         return 0;
1198 }
1199
1200 int perf_pmu__config_terms(const char *pmu_name, struct list_head *formats,
1201                            struct perf_event_attr *attr,
1202                            struct list_head *head_terms,
1203                            bool zero, struct parse_events_error *err)
1204 {
1205         struct parse_events_term *term;
1206
1207         list_for_each_entry(term, head_terms, list) {
1208                 if (pmu_config_term(pmu_name, formats, attr, term, head_terms,
1209                                     zero, err))
1210                         return -EINVAL;
1211         }
1212
1213         return 0;
1214 }
1215
1216 /*
1217  * Configures event's 'attr' parameter based on the:
1218  * 1) users input - specified in terms parameter
1219  * 2) pmu format definitions - specified by pmu parameter
1220  */
1221 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
1222                      struct list_head *head_terms,
1223                      struct parse_events_error *err)
1224 {
1225         bool zero = !!pmu->default_config;
1226
1227         attr->type = pmu->type;
1228         return perf_pmu__config_terms(pmu->name, &pmu->format, attr,
1229                                       head_terms, zero, err);
1230 }
1231
1232 static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
1233                                              struct parse_events_term *term)
1234 {
1235         struct perf_pmu_alias *alias;
1236         char *name;
1237
1238         if (parse_events__is_hardcoded_term(term))
1239                 return NULL;
1240
1241         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
1242                 if (term->val.num != 1)
1243                         return NULL;
1244                 if (pmu_find_format(&pmu->format, term->config))
1245                         return NULL;
1246                 name = term->config;
1247         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
1248                 if (strcasecmp(term->config, "event"))
1249                         return NULL;
1250                 name = term->val.str;
1251         } else {
1252                 return NULL;
1253         }
1254
1255         list_for_each_entry(alias, &pmu->aliases, list) {
1256                 if (!strcasecmp(alias->name, name))
1257                         return alias;
1258         }
1259         return NULL;
1260 }
1261
1262
1263 static int check_info_data(struct perf_pmu_alias *alias,
1264                            struct perf_pmu_info *info)
1265 {
1266         /*
1267          * Only one term in event definition can
1268          * define unit, scale and snapshot, fail
1269          * if there's more than one.
1270          */
1271         if ((info->unit && alias->unit[0]) ||
1272             (info->scale && alias->scale) ||
1273             (info->snapshot && alias->snapshot))
1274                 return -EINVAL;
1275
1276         if (alias->unit[0])
1277                 info->unit = alias->unit;
1278
1279         if (alias->scale)
1280                 info->scale = alias->scale;
1281
1282         if (alias->snapshot)
1283                 info->snapshot = alias->snapshot;
1284
1285         return 0;
1286 }
1287
1288 /*
1289  * Find alias in the terms list and replace it with the terms
1290  * defined for the alias
1291  */
1292 int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms,
1293                           struct perf_pmu_info *info)
1294 {
1295         struct parse_events_term *term, *h;
1296         struct perf_pmu_alias *alias;
1297         int ret;
1298
1299         info->per_pkg = false;
1300
1301         /*
1302          * Mark unit and scale as not set
1303          * (different from default values, see below)
1304          */
1305         info->unit     = NULL;
1306         info->scale    = 0.0;
1307         info->snapshot = false;
1308         info->metric_expr = NULL;
1309         info->metric_name = NULL;
1310
1311         list_for_each_entry_safe(term, h, head_terms, list) {
1312                 alias = pmu_find_alias(pmu, term);
1313                 if (!alias)
1314                         continue;
1315                 ret = pmu_alias_terms(alias, &term->list);
1316                 if (ret)
1317                         return ret;
1318
1319                 ret = check_info_data(alias, info);
1320                 if (ret)
1321                         return ret;
1322
1323                 if (alias->per_pkg)
1324                         info->per_pkg = true;
1325                 info->metric_expr = alias->metric_expr;
1326                 info->metric_name = alias->metric_name;
1327
1328                 list_del_init(&term->list);
1329                 parse_events_term__delete(term);
1330         }
1331
1332         /*
1333          * if no unit or scale foundin aliases, then
1334          * set defaults as for evsel
1335          * unit cannot left to NULL
1336          */
1337         if (info->unit == NULL)
1338                 info->unit   = "";
1339
1340         if (info->scale == 0.0)
1341                 info->scale  = 1.0;
1342
1343         return 0;
1344 }
1345
1346 int perf_pmu__new_format(struct list_head *list, char *name,
1347                          int config, unsigned long *bits)
1348 {
1349         struct perf_pmu_format *format;
1350
1351         format = zalloc(sizeof(*format));
1352         if (!format)
1353                 return -ENOMEM;
1354
1355         format->name = strdup(name);
1356         format->value = config;
1357         memcpy(format->bits, bits, sizeof(format->bits));
1358
1359         list_add_tail(&format->list, list);
1360         return 0;
1361 }
1362
1363 void perf_pmu__set_format(unsigned long *bits, long from, long to)
1364 {
1365         long b;
1366
1367         if (!to)
1368                 to = from;
1369
1370         memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS));
1371         for (b = from; b <= to; b++)
1372                 set_bit(b, bits);
1373 }
1374
1375 void perf_pmu__del_formats(struct list_head *formats)
1376 {
1377         struct perf_pmu_format *fmt, *tmp;
1378
1379         list_for_each_entry_safe(fmt, tmp, formats, list) {
1380                 list_del(&fmt->list);
1381                 free(fmt->name);
1382                 free(fmt);
1383         }
1384 }
1385
1386 static int sub_non_neg(int a, int b)
1387 {
1388         if (b > a)
1389                 return 0;
1390         return a - b;
1391 }
1392
1393 static char *format_alias(char *buf, int len, struct perf_pmu *pmu,
1394                           struct perf_pmu_alias *alias)
1395 {
1396         struct parse_events_term *term;
1397         int used = snprintf(buf, len, "%s/%s", pmu->name, alias->name);
1398
1399         list_for_each_entry(term, &alias->terms, list) {
1400                 if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
1401                         used += snprintf(buf + used, sub_non_neg(len, used),
1402                                         ",%s=%s", term->config,
1403                                         term->val.str);
1404         }
1405
1406         if (sub_non_neg(len, used) > 0) {
1407                 buf[used] = '/';
1408                 used++;
1409         }
1410         if (sub_non_neg(len, used) > 0) {
1411                 buf[used] = '\0';
1412                 used++;
1413         } else
1414                 buf[len - 1] = '\0';
1415
1416         return buf;
1417 }
1418
1419 static char *format_alias_or(char *buf, int len, struct perf_pmu *pmu,
1420                              struct perf_pmu_alias *alias)
1421 {
1422         snprintf(buf, len, "%s OR %s/%s/", alias->name, pmu->name, alias->name);
1423         return buf;
1424 }
1425
1426 struct sevent {
1427         char *name;
1428         char *desc;
1429         char *topic;
1430         char *str;
1431         char *pmu;
1432         char *metric_expr;
1433         char *metric_name;
1434         int is_cpu;
1435 };
1436
1437 static int cmp_sevent(const void *a, const void *b)
1438 {
1439         const struct sevent *as = a;
1440         const struct sevent *bs = b;
1441
1442         /* Put extra events last */
1443         if (!!as->desc != !!bs->desc)
1444                 return !!as->desc - !!bs->desc;
1445         if (as->topic && bs->topic) {
1446                 int n = strcmp(as->topic, bs->topic);
1447
1448                 if (n)
1449                         return n;
1450         }
1451
1452         /* Order CPU core events to be first */
1453         if (as->is_cpu != bs->is_cpu)
1454                 return bs->is_cpu - as->is_cpu;
1455
1456         return strcmp(as->name, bs->name);
1457 }
1458
1459 static void wordwrap(char *s, int start, int max, int corr)
1460 {
1461         int column = start;
1462         int n;
1463
1464         while (*s) {
1465                 int wlen = strcspn(s, " \t");
1466
1467                 if (column + wlen >= max && column > start) {
1468                         printf("\n%*s", start, "");
1469                         column = start + corr;
1470                 }
1471                 n = printf("%s%.*s", column > start ? " " : "", wlen, s);
1472                 if (n <= 0)
1473                         break;
1474                 s += wlen;
1475                 column += n;
1476                 s = skip_spaces(s);
1477         }
1478 }
1479
1480 bool is_pmu_core(const char *name)
1481 {
1482         return !strcmp(name, "cpu") || is_arm_pmu_core(name);
1483 }
1484
1485 void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
1486                         bool long_desc, bool details_flag, bool deprecated)
1487 {
1488         struct perf_pmu *pmu;
1489         struct perf_pmu_alias *alias;
1490         char buf[1024];
1491         int printed = 0;
1492         int len, j;
1493         struct sevent *aliases;
1494         int numdesc = 0;
1495         int columns = pager_get_columns();
1496         char *topic = NULL;
1497
1498         pmu = NULL;
1499         len = 0;
1500         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1501                 list_for_each_entry(alias, &pmu->aliases, list)
1502                         len++;
1503                 if (pmu->selectable)
1504                         len++;
1505         }
1506         aliases = zalloc(sizeof(struct sevent) * len);
1507         if (!aliases)
1508                 goto out_enomem;
1509         pmu = NULL;
1510         j = 0;
1511         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1512                 list_for_each_entry(alias, &pmu->aliases, list) {
1513                         char *name = alias->desc ? alias->name :
1514                                 format_alias(buf, sizeof(buf), pmu, alias);
1515                         bool is_cpu = is_pmu_core(pmu->name);
1516
1517                         if (alias->deprecated && !deprecated)
1518                                 continue;
1519
1520                         if (event_glob != NULL &&
1521                             !(strglobmatch_nocase(name, event_glob) ||
1522                               (!is_cpu && strglobmatch_nocase(alias->name,
1523                                                        event_glob)) ||
1524                               (alias->topic &&
1525                                strglobmatch_nocase(alias->topic, event_glob))))
1526                                 continue;
1527
1528                         if (is_cpu && !name_only && !alias->desc)
1529                                 name = format_alias_or(buf, sizeof(buf), pmu, alias);
1530
1531                         aliases[j].name = name;
1532                         if (is_cpu && !name_only && !alias->desc)
1533                                 aliases[j].name = format_alias_or(buf,
1534                                                                   sizeof(buf),
1535                                                                   pmu, alias);
1536                         aliases[j].name = strdup(aliases[j].name);
1537                         if (!aliases[j].name)
1538                                 goto out_enomem;
1539
1540                         aliases[j].desc = long_desc ? alias->long_desc :
1541                                                 alias->desc;
1542                         aliases[j].topic = alias->topic;
1543                         aliases[j].str = alias->str;
1544                         aliases[j].pmu = pmu->name;
1545                         aliases[j].metric_expr = alias->metric_expr;
1546                         aliases[j].metric_name = alias->metric_name;
1547                         aliases[j].is_cpu = is_cpu;
1548                         j++;
1549                 }
1550                 if (pmu->selectable &&
1551                     (event_glob == NULL || strglobmatch(pmu->name, event_glob))) {
1552                         char *s;
1553                         if (asprintf(&s, "%s//", pmu->name) < 0)
1554                                 goto out_enomem;
1555                         aliases[j].name = s;
1556                         j++;
1557                 }
1558         }
1559         len = j;
1560         qsort(aliases, len, sizeof(struct sevent), cmp_sevent);
1561         for (j = 0; j < len; j++) {
1562                 /* Skip duplicates */
1563                 if (j > 0 && !strcmp(aliases[j].name, aliases[j - 1].name))
1564                         continue;
1565                 if (name_only) {
1566                         printf("%s ", aliases[j].name);
1567                         continue;
1568                 }
1569                 if (aliases[j].desc && !quiet_flag) {
1570                         if (numdesc++ == 0)
1571                                 printf("\n");
1572                         if (aliases[j].topic && (!topic ||
1573                                         strcmp(topic, aliases[j].topic))) {
1574                                 printf("%s%s:\n", topic ? "\n" : "",
1575                                                 aliases[j].topic);
1576                                 topic = aliases[j].topic;
1577                         }
1578                         printf("  %-50s\n", aliases[j].name);
1579                         printf("%*s", 8, "[");
1580                         wordwrap(aliases[j].desc, 8, columns, 0);
1581                         printf("]\n");
1582                         if (details_flag) {
1583                                 printf("%*s%s/%s/ ", 8, "", aliases[j].pmu, aliases[j].str);
1584                                 if (aliases[j].metric_name)
1585                                         printf(" MetricName: %s", aliases[j].metric_name);
1586                                 if (aliases[j].metric_expr)
1587                                         printf(" MetricExpr: %s", aliases[j].metric_expr);
1588                                 putchar('\n');
1589                         }
1590                 } else
1591                         printf("  %-50s [Kernel PMU event]\n", aliases[j].name);
1592                 printed++;
1593         }
1594         if (printed && pager_in_use())
1595                 printf("\n");
1596 out_free:
1597         for (j = 0; j < len; j++)
1598                 zfree(&aliases[j].name);
1599         zfree(&aliases);
1600         return;
1601
1602 out_enomem:
1603         printf("FATAL: not enough memory to print PMU events\n");
1604         if (aliases)
1605                 goto out_free;
1606 }
1607
1608 bool pmu_have_event(const char *pname, const char *name)
1609 {
1610         struct perf_pmu *pmu;
1611         struct perf_pmu_alias *alias;
1612
1613         pmu = NULL;
1614         while ((pmu = perf_pmu__scan(pmu)) != NULL) {
1615                 if (strcmp(pname, pmu->name))
1616                         continue;
1617                 list_for_each_entry(alias, &pmu->aliases, list)
1618                         if (!strcmp(alias->name, name))
1619                                 return true;
1620         }
1621         return false;
1622 }
1623
1624 static FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name)
1625 {
1626         char path[PATH_MAX];
1627         const char *sysfs;
1628
1629         sysfs = sysfs__mountpoint();
1630         if (!sysfs)
1631                 return NULL;
1632
1633         snprintf(path, PATH_MAX,
1634                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/%s", sysfs, pmu->name, name);
1635         if (!file_available(path))
1636                 return NULL;
1637         return fopen(path, "r");
1638 }
1639
1640 int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt,
1641                         ...)
1642 {
1643         va_list args;
1644         FILE *file;
1645         int ret = EOF;
1646
1647         va_start(args, fmt);
1648         file = perf_pmu__open_file(pmu, name);
1649         if (file) {
1650                 ret = vfscanf(file, fmt, args);
1651                 fclose(file);
1652         }
1653         va_end(args);
1654         return ret;
1655 }
1656
1657 static int perf_pmu__new_caps(struct list_head *list, char *name, char *value)
1658 {
1659         struct perf_pmu_caps *caps = zalloc(sizeof(*caps));
1660
1661         if (!caps)
1662                 return -ENOMEM;
1663
1664         caps->name = strdup(name);
1665         if (!caps->name)
1666                 goto free_caps;
1667         caps->value = strndup(value, strlen(value) - 1);
1668         if (!caps->value)
1669                 goto free_name;
1670         list_add_tail(&caps->list, list);
1671         return 0;
1672
1673 free_name:
1674         zfree(caps->name);
1675 free_caps:
1676         free(caps);
1677
1678         return -ENOMEM;
1679 }
1680
1681 /*
1682  * Reading/parsing the given pmu capabilities, which should be located at:
1683  * /sys/bus/event_source/devices/<dev>/caps as sysfs group attributes.
1684  * Return the number of capabilities
1685  */
1686 int perf_pmu__caps_parse(struct perf_pmu *pmu)
1687 {
1688         struct stat st;
1689         char caps_path[PATH_MAX];
1690         const char *sysfs = sysfs__mountpoint();
1691         DIR *caps_dir;
1692         struct dirent *evt_ent;
1693         int nr_caps = 0;
1694
1695         if (!sysfs)
1696                 return -1;
1697
1698         snprintf(caps_path, PATH_MAX,
1699                  "%s" EVENT_SOURCE_DEVICE_PATH "%s/caps", sysfs, pmu->name);
1700
1701         if (stat(caps_path, &st) < 0)
1702                 return 0;       /* no error if caps does not exist */
1703
1704         caps_dir = opendir(caps_path);
1705         if (!caps_dir)
1706                 return -EINVAL;
1707
1708         while ((evt_ent = readdir(caps_dir)) != NULL) {
1709                 char path[PATH_MAX + NAME_MAX + 1];
1710                 char *name = evt_ent->d_name;
1711                 char value[128];
1712                 FILE *file;
1713
1714                 if (!strcmp(name, ".") || !strcmp(name, ".."))
1715                         continue;
1716
1717                 snprintf(path, sizeof(path), "%s/%s", caps_path, name);
1718
1719                 file = fopen(path, "r");
1720                 if (!file)
1721                         continue;
1722
1723                 if (!fgets(value, sizeof(value), file) ||
1724                     (perf_pmu__new_caps(&pmu->caps, name, value) < 0)) {
1725                         fclose(file);
1726                         continue;
1727                 }
1728
1729                 nr_caps++;
1730                 fclose(file);
1731         }
1732
1733         closedir(caps_dir);
1734
1735         return nr_caps;
1736 }