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