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 <linux/ctype.h>
   7 #include <sys/types.h>
   8 #include <fcntl.h>
   9 #include <sys/stat.h>
  10 #include <unistd.h>
  11 #include <stdio.h>
  12 #include <stdbool.h>
  13 #include <dirent.h>
  14 #include <api/fs/fs.h>
  15 #include <locale.h>
  16 #include <fnmatch.h>
  17 #include <math.h>
  18 #include "debug.h"
  19 #include "evsel.h"
  20 #include "pmu.h"
  21 #include "pmus.h"
  22 #include <util/pmu-bison.h>
  23 #include <util/pmu-flex.h>
  24 #include "parse-events.h"
  25 #include "print-events.h"
  26 #include "header.h"
  27 #include "string2.h"
  28 #include "strbuf.h"
  29 #include "fncache.h"
  30 #include "util/evsel_config.h"
  31 #include <regex.h>
  32
  33 struct perf_pmu perf_pmu__fake = {
  34         .name = "fake",
  35 };
  36
  37 #define UNIT_MAX_LEN    31 /* max length for event unit name */
  38
  39 enum event_source {
  40         /* An event loaded from /sys/devices/<pmu>/events. */
  41         EVENT_SRC_SYSFS,
  42         /* An event loaded from a CPUID matched json file. */
  43         EVENT_SRC_CPU_JSON,
  44         /*
  45          * An event loaded from a /sys/devices/<pmu>/identifier matched json
  46          * file.
  47          */
  48         EVENT_SRC_SYS_JSON,
  49 };
  50
  51 /**
  52  * struct perf_pmu_alias - An event either read from sysfs or builtin in
  53  * pmu-events.c, created by parsing the pmu-events json files.
  54  */
  55 struct perf_pmu_alias {
  56         /** @name: Name of the event like "mem-loads". */
  57         char *name;
  58         /** @desc: Optional short description of the event. */
  59         char *desc;
  60         /** @long_desc: Optional long description. */
  61         char *long_desc;
  62         /**
  63          * @topic: Optional topic such as cache or pipeline, particularly for
  64          * json events.
  65          */
  66         char *topic;
  67         /** @terms: Owned list of the original parsed parameters. */
  68         struct parse_events_terms terms;
  69         /** @list: List element of struct perf_pmu aliases. */
  70         struct list_head list;
  71         /**
  72          * @pmu_name: The name copied from the json struct pmu_event. This can
  73          * differ from the PMU name as it won't have suffixes.
  74          */
  75         char *pmu_name;
  76         /** @unit: Units for the event, such as bytes or cache lines. */
  77         char unit[UNIT_MAX_LEN+1];
  78         /** @scale: Value to scale read counter values by. */
  79         double scale;
  80         /**
  81          * @per_pkg: Does the file
  82          * <sysfs>/bus/event_source/devices/<pmu_name>/events/<name>.per-pkg or
  83          * equivalent json value exist and have the value 1.
  84          */
  85         bool per_pkg;
  86         /**
  87          * @snapshot: Does the file
  88          * <sysfs>/bus/event_source/devices/<pmu_name>/events/<name>.snapshot
  89          * exist and have the value 1.
  90          */
  91         bool snapshot;
  92         /**
  93          * @deprecated: Is the event hidden and so not shown in perf list by
  94          * default.
  95          */
  96         bool deprecated;
  97         /** @from_sysfs: Was the alias from sysfs or a json event? */
  98         bool from_sysfs;
  99         /** @info_loaded: Have the scale, unit and other values been read from disk? */
 100         bool info_loaded;
 101 };
 102
 103 /**
 104  * struct perf_pmu_format - Values from a format file read from
 105  * <sysfs>/devices/cpu/format/ held in struct perf_pmu.
 106  *
 107  * For example, the contents of <sysfs>/devices/cpu/format/event may be
 108  * "config:0-7" and will be represented here as name="event",
 109  * value=PERF_PMU_FORMAT_VALUE_CONFIG and bits 0 to 7 will be set.
 110  */
 111 struct perf_pmu_format {
 112         /** @list: Element on list within struct perf_pmu. */
 113         struct list_head list;
 114         /** @bits: Which config bits are set by this format value. */
 115         DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS);
 116         /** @name: The modifier/file name. */
 117         char *name;
 118         /**
 119          * @value : Which config value the format relates to. Supported values
 120          * are from PERF_PMU_FORMAT_VALUE_CONFIG to
 121          * PERF_PMU_FORMAT_VALUE_CONFIG_END.
 122          */
 123         u16 value;
 124         /** @loaded: Has the contents been loaded/parsed. */
 125         bool loaded;
 126 };
 127
 128 static int pmu_aliases_parse(struct perf_pmu *pmu);
 129
 130 static struct perf_pmu_format *perf_pmu__new_format(struct list_head *list, char *name)
 131 {
 132         struct perf_pmu_format *format;
 133
 134         format = zalloc(sizeof(*format));
 135         if (!format)
 136                 return NULL;
 137
 138         format->name = strdup(name);
 139         if (!format->name) {
 140                 free(format);
 141                 return NULL;
 142         }
 143         list_add_tail(&format->list, list);
 144         return format;
 145 }
 146
 147 /* Called at the end of parsing a format. */
 148 void perf_pmu_format__set_value(void *vformat, int config, unsigned long *bits)
 149 {
 150         struct perf_pmu_format *format = vformat;
 151
 152         format->value = config;
 153         memcpy(format->bits, bits, sizeof(format->bits));
 154 }
 155
 156 static void __perf_pmu_format__load(struct perf_pmu_format *format, FILE *file)
 157 {
 158         void *scanner;
 159         int ret;
 160
 161         ret = perf_pmu_lex_init(&scanner);
 162         if (ret)
 163                 return;
 164
 165         perf_pmu_set_in(file, scanner);
 166         ret = perf_pmu_parse(format, scanner);
 167         perf_pmu_lex_destroy(scanner);
 168         format->loaded = true;
 169 }
 170
 171 static void perf_pmu_format__load(const struct perf_pmu *pmu, struct perf_pmu_format *format)
 172 {
 173         char path[PATH_MAX];
 174         FILE *file = NULL;
 175
 176         if (format->loaded)
 177                 return;
 178
 179         if (!perf_pmu__pathname_scnprintf(path, sizeof(path), pmu->name, "format"))
 180                 return;
 181
 182         assert(strlen(path) + strlen(format->name) + 2 < sizeof(path));
 183         strcat(path, "/");
 184         strcat(path, format->name);
 185
 186         file = fopen(path, "r");
 187         if (!file)
 188                 return;
 189         __perf_pmu_format__load(format, file);
 190         fclose(file);
 191 }
 192
 193 /*
 194  * Parse & process all the sysfs attributes located under
 195  * the directory specified in 'dir' parameter.
 196  */
 197 static int perf_pmu__format_parse(struct perf_pmu *pmu, int dirfd, bool eager_load)
 198 {
 199         struct dirent *evt_ent;
 200         DIR *format_dir;
 201         int ret = 0;
 202
 203         format_dir = fdopendir(dirfd);
 204         if (!format_dir)
 205                 return -EINVAL;
 206
 207         while ((evt_ent = readdir(format_dir)) != NULL) {
 208                 struct perf_pmu_format *format;
 209                 char *name = evt_ent->d_name;
 210
 211                 if (!strcmp(name, ".") || !strcmp(name, ".."))
 212                         continue;
 213
 214                 format = perf_pmu__new_format(&pmu->format, name);
 215                 if (!format) {
 216                         ret = -ENOMEM;
 217                         break;
 218                 }
 219
 220                 if (eager_load) {
 221                         FILE *file;
 222                         int fd = openat(dirfd, name, O_RDONLY);
 223
 224                         if (fd < 0) {
 225                                 ret = -errno;
 226                                 break;
 227                         }
 228                         file = fdopen(fd, "r");
 229                         if (!file) {
 230                                 close(fd);
 231                                 break;
 232                         }
 233                         __perf_pmu_format__load(format, file);
 234                         fclose(file);
 235                 }
 236         }
 237
 238         closedir(format_dir);
 239         return ret;
 240 }
 241
 242 /*
 243  * Reading/parsing the default pmu format definition, which should be
 244  * located at:
 245  * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
 246  */
 247 static int pmu_format(struct perf_pmu *pmu, int dirfd, const char *name, bool eager_load)
 248 {
 249         int fd;
 250
 251         fd = perf_pmu__pathname_fd(dirfd, name, "format", O_DIRECTORY);
 252         if (fd < 0)
 253                 return 0;
 254
 255         /* it'll close the fd */
 256         if (perf_pmu__format_parse(pmu, fd, eager_load))
 257                 return -1;
 258
 259         return 0;
 260 }
 261
 262 int perf_pmu__convert_scale(const char *scale, char **end, double *sval)
 263 {
 264         char *lc;
 265         int ret = 0;
 266
 267         /*
 268          * save current locale
 269          */
 270         lc = setlocale(LC_NUMERIC, NULL);
 271
 272         /*
 273          * The lc string may be allocated in static storage,
 274          * so get a dynamic copy to make it survive setlocale
 275          * call below.
 276          */
 277         lc = strdup(lc);
 278         if (!lc) {
 279                 ret = -ENOMEM;
 280                 goto out;
 281         }
 282
 283         /*
 284          * force to C locale to ensure kernel
 285          * scale string is converted correctly.
 286          * kernel uses default C locale.
 287          */
 288         setlocale(LC_NUMERIC, "C");
 289
 290         *sval = strtod(scale, end);
 291
 292 out:
 293         /* restore locale */
 294         setlocale(LC_NUMERIC, lc);
 295         free(lc);
 296         return ret;
 297 }
 298
 299 static int perf_pmu__parse_scale(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
 300 {
 301         struct stat st;
 302         ssize_t sret;
 303         size_t len;
 304         char scale[128];
 305         int fd, ret = -1;
 306         char path[PATH_MAX];
 307
 308         len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
 309         if (!len)
 310                 return 0;
 311         scnprintf(path + len, sizeof(path) - len, "%s/events/%s.scale", pmu->name, alias->name);
 312
 313         fd = open(path, O_RDONLY);
 314         if (fd == -1)
 315                 return -1;
 316
 317         if (fstat(fd, &st) < 0)
 318                 goto error;
 319
 320         sret = read(fd, scale, sizeof(scale)-1);
 321         if (sret < 0)
 322                 goto error;
 323
 324         if (scale[sret - 1] == '\n')
 325                 scale[sret - 1] = '\0';
 326         else
 327                 scale[sret] = '\0';
 328
 329         ret = perf_pmu__convert_scale(scale, NULL, &alias->scale);
 330 error:
 331         close(fd);
 332         return ret;
 333 }
 334
 335 static int perf_pmu__parse_unit(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
 336 {
 337         char path[PATH_MAX];
 338         size_t len;
 339         ssize_t sret;
 340         int fd;
 341
 342
 343         len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
 344         if (!len)
 345                 return 0;
 346         scnprintf(path + len, sizeof(path) - len, "%s/events/%s.unit", pmu->name, alias->name);
 347
 348         fd = open(path, O_RDONLY);
 349         if (fd == -1)
 350                 return -1;
 351
 352         sret = read(fd, alias->unit, UNIT_MAX_LEN);
 353         if (sret < 0)
 354                 goto error;
 355
 356         close(fd);
 357
 358         if (alias->unit[sret - 1] == '\n')
 359                 alias->unit[sret - 1] = '\0';
 360         else
 361                 alias->unit[sret] = '\0';
 362
 363         return 0;
 364 error:
 365         close(fd);
 366         alias->unit[0] = '\0';
 367         return -1;
 368 }
 369
 370 static int
 371 perf_pmu__parse_per_pkg(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
 372 {
 373         char path[PATH_MAX];
 374         size_t len;
 375         int fd;
 376
 377         len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
 378         if (!len)
 379                 return 0;
 380         scnprintf(path + len, sizeof(path) - len, "%s/events/%s.per-pkg", pmu->name, alias->name);
 381
 382         fd = open(path, O_RDONLY);
 383         if (fd == -1)
 384                 return -1;
 385
 386         close(fd);
 387
 388         alias->per_pkg = true;
 389         return 0;
 390 }
 391
 392 static int perf_pmu__parse_snapshot(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
 393 {
 394         char path[PATH_MAX];
 395         size_t len;
 396         int fd;
 397
 398         len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
 399         if (!len)
 400                 return 0;
 401         scnprintf(path + len, sizeof(path) - len, "%s/events/%s.snapshot", pmu->name, alias->name);
 402
 403         fd = open(path, O_RDONLY);
 404         if (fd == -1)
 405                 return -1;
 406
 407         alias->snapshot = true;
 408         close(fd);
 409         return 0;
 410 }
 411
 412 /* Delete an alias entry. */
 413 static void perf_pmu_free_alias(struct perf_pmu_alias *newalias)
 414 {
 415         zfree(&newalias->name);
 416         zfree(&newalias->desc);
 417         zfree(&newalias->long_desc);
 418         zfree(&newalias->topic);
 419         zfree(&newalias->pmu_name);
 420         parse_events_terms__exit(&newalias->terms);
 421         free(newalias);
 422 }
 423
 424 static void perf_pmu__del_aliases(struct perf_pmu *pmu)
 425 {
 426         struct perf_pmu_alias *alias, *tmp;
 427
 428         list_for_each_entry_safe(alias, tmp, &pmu->aliases, list) {
 429                 list_del(&alias->list);
 430                 perf_pmu_free_alias(alias);
 431         }
 432 }
 433
 434 static struct perf_pmu_alias *perf_pmu__find_alias(struct perf_pmu *pmu,
 435                                                    const char *name,
 436                                                    bool load)
 437 {
 438         struct perf_pmu_alias *alias;
 439
 440         if (load && !pmu->sysfs_aliases_loaded) {
 441                 bool has_sysfs_event;
 442                 char event_file_name[FILENAME_MAX + 8];
 443
 444                 /*
 445                  * Test if alias/event 'name' exists in the PMU's sysfs/events
 446                  * directory. If not skip parsing the sysfs aliases. Sysfs event
 447                  * name must be all lower or all upper case.
 448                  */
 449                 scnprintf(event_file_name, sizeof(event_file_name), "events/%s", name);
 450                 for (size_t i = 7, n = 7 + strlen(name); i < n; i++)
 451                         event_file_name[i] = tolower(event_file_name[i]);
 452
 453                 has_sysfs_event = perf_pmu__file_exists(pmu, event_file_name);
 454                 if (!has_sysfs_event) {
 455                         for (size_t i = 7, n = 7 + strlen(name); i < n; i++)
 456                                 event_file_name[i] = toupper(event_file_name[i]);
 457
 458                         has_sysfs_event = perf_pmu__file_exists(pmu, event_file_name);
 459                 }
 460                 if (has_sysfs_event)
 461                         pmu_aliases_parse(pmu);
 462
 463         }
 464         list_for_each_entry(alias, &pmu->aliases, list) {
 465                 if (!strcasecmp(alias->name, name))
 466                         return alias;
 467         }
 468         return NULL;
 469 }
 470
 471 static bool assign_str(const char *name, const char *field, char **old_str,
 472                                 const char *new_str)
 473 {
 474         if (!*old_str && new_str) {
 475                 *old_str = strdup(new_str);
 476                 return true;
 477         }
 478
 479         if (!new_str || !strcasecmp(*old_str, new_str))
 480                 return false; /* Nothing to update. */
 481
 482         pr_debug("alias %s differs in field '%s' ('%s' != '%s')\n",
 483                 name, field, *old_str, new_str);
 484         zfree(old_str);
 485         *old_str = strdup(new_str);
 486         return true;
 487 }
 488
 489 static void read_alias_info(struct perf_pmu *pmu, struct perf_pmu_alias *alias)
 490 {
 491         if (!alias->from_sysfs || alias->info_loaded)
 492                 return;
 493
 494         /*
 495          * load unit name and scale if available
 496          */
 497         perf_pmu__parse_unit(pmu, alias);
 498         perf_pmu__parse_scale(pmu, alias);
 499         perf_pmu__parse_per_pkg(pmu, alias);
 500         perf_pmu__parse_snapshot(pmu, alias);
 501 }
 502
 503 struct update_alias_data {
 504         struct perf_pmu *pmu;
 505         struct perf_pmu_alias *alias;
 506 };
 507
 508 static int update_alias(const struct pmu_event *pe,
 509                         const struct pmu_events_table *table __maybe_unused,
 510                         void *vdata)
 511 {
 512         struct update_alias_data *data = vdata;
 513         int ret = 0;
 514
 515         read_alias_info(data->pmu, data->alias);
 516         assign_str(pe->name, "desc", &data->alias->desc, pe->desc);
 517         assign_str(pe->name, "long_desc", &data->alias->long_desc, pe->long_desc);
 518         assign_str(pe->name, "topic", &data->alias->topic, pe->topic);
 519         data->alias->per_pkg = pe->perpkg;
 520         if (pe->event) {
 521                 parse_events_terms__exit(&data->alias->terms);
 522                 ret = parse_events_terms(&data->alias->terms, pe->event, /*input=*/NULL);
 523         }
 524         if (!ret && pe->unit) {
 525                 char *unit;
 526
 527                 ret = perf_pmu__convert_scale(pe->unit, &unit, &data->alias->scale);
 528                 if (!ret)
 529                         snprintf(data->alias->unit, sizeof(data->alias->unit), "%s", unit);
 530         }
 531         return ret;
 532 }
 533
 534 static int perf_pmu__new_alias(struct perf_pmu *pmu, const char *name,
 535                                 const char *desc, const char *val, FILE *val_fd,
 536                                 const struct pmu_event *pe, enum event_source src)
 537 {
 538         struct perf_pmu_alias *alias;
 539         int ret;
 540         const char *long_desc = NULL, *topic = NULL, *unit = NULL, *pmu_name = NULL;
 541         bool deprecated = false, perpkg = false;
 542
 543         if (perf_pmu__find_alias(pmu, name, /*load=*/ false)) {
 544                 /* Alias was already created/loaded. */
 545                 return 0;
 546         }
 547
 548         if (pe) {
 549                 long_desc = pe->long_desc;
 550                 topic = pe->topic;
 551                 unit = pe->unit;
 552                 perpkg = pe->perpkg;
 553                 deprecated = pe->deprecated;
 554                 if (pe->pmu && strcmp(pe->pmu, "default_core"))
 555                         pmu_name = pe->pmu;
 556         }
 557
 558         alias = zalloc(sizeof(*alias));
 559         if (!alias)
 560                 return -ENOMEM;
 561
 562         parse_events_terms__init(&alias->terms);
 563         alias->scale = 1.0;
 564         alias->unit[0] = '\0';
 565         alias->per_pkg = perpkg;
 566         alias->snapshot = false;
 567         alias->deprecated = deprecated;
 568
 569         ret = parse_events_terms(&alias->terms, val, val_fd);
 570         if (ret) {
 571                 pr_err("Cannot parse alias %s: %d\n", val, ret);
 572                 free(alias);
 573                 return ret;
 574         }
 575
 576         alias->name = strdup(name);
 577         alias->desc = desc ? strdup(desc) : NULL;
 578         alias->long_desc = long_desc ? strdup(long_desc) :
 579                                 desc ? strdup(desc) : NULL;
 580         alias->topic = topic ? strdup(topic) : NULL;
 581         alias->pmu_name = pmu_name ? strdup(pmu_name) : NULL;
 582         if (unit) {
 583                 if (perf_pmu__convert_scale(unit, (char **)&unit, &alias->scale) < 0) {
 584                         perf_pmu_free_alias(alias);
 585                         return -1;
 586                 }
 587                 snprintf(alias->unit, sizeof(alias->unit), "%s", unit);
 588         }
 589         switch (src) {
 590         default:
 591         case EVENT_SRC_SYSFS:
 592                 alias->from_sysfs = true;
 593                 if (pmu->events_table) {
 594                         /* Update an event from sysfs with json data. */
 595                         struct update_alias_data data = {
 596                                 .pmu = pmu,
 597                                 .alias = alias,
 598                         };
 599                         if (pmu_events_table__find_event(pmu->events_table, pmu, name,
 600                                                          update_alias, &data) == 0)
 601                                 pmu->cpu_json_aliases++;
 602                 }
 603                 pmu->sysfs_aliases++;
 604                 break;
 605         case  EVENT_SRC_CPU_JSON:
 606                 pmu->cpu_json_aliases++;
 607                 break;
 608         case  EVENT_SRC_SYS_JSON:
 609                 pmu->sys_json_aliases++;
 610                 break;
 611
 612         }
 613         list_add_tail(&alias->list, &pmu->aliases);
 614         return 0;
 615 }
 616
 617 static inline bool pmu_alias_info_file(const char *name)
 618 {
 619         size_t len;
 620
 621         len = strlen(name);
 622         if (len > 5 && !strcmp(name + len - 5, ".unit"))
 623                 return true;
 624         if (len > 6 && !strcmp(name + len - 6, ".scale"))
 625                 return true;
 626         if (len > 8 && !strcmp(name + len - 8, ".per-pkg"))
 627                 return true;
 628         if (len > 9 && !strcmp(name + len - 9, ".snapshot"))
 629                 return true;
 630
 631         return false;
 632 }
 633
 634 /*
 635  * Reading the pmu event aliases definition, which should be located at:
 636  * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
 637  */
 638 static int __pmu_aliases_parse(struct perf_pmu *pmu, int events_dir_fd)
 639 {
 640         struct dirent *evt_ent;
 641         DIR *event_dir;
 642
 643         event_dir = fdopendir(events_dir_fd);
 644         if (!event_dir)
 645                 return -EINVAL;
 646
 647         while ((evt_ent = readdir(event_dir))) {
 648                 char *name = evt_ent->d_name;
 649                 int fd;
 650                 FILE *file;
 651
 652                 if (!strcmp(name, ".") || !strcmp(name, ".."))
 653                         continue;
 654
 655                 /*
 656                  * skip info files parsed in perf_pmu__new_alias()
 657                  */
 658                 if (pmu_alias_info_file(name))
 659                         continue;
 660
 661                 fd = openat(events_dir_fd, name, O_RDONLY);
 662                 if (fd == -1) {
 663                         pr_debug("Cannot open %s\n", name);
 664                         continue;
 665                 }
 666                 file = fdopen(fd, "r");
 667                 if (!file) {
 668                         close(fd);
 669                         continue;
 670                 }
 671
 672                 if (perf_pmu__new_alias(pmu, name, /*desc=*/ NULL,
 673                                         /*val=*/ NULL, file, /*pe=*/ NULL,
 674                                         EVENT_SRC_SYSFS) < 0)
 675                         pr_debug("Cannot set up %s\n", name);
 676                 fclose(file);
 677         }
 678
 679         closedir(event_dir);
 680         pmu->sysfs_aliases_loaded = true;
 681         return 0;
 682 }
 683
 684 static int pmu_aliases_parse(struct perf_pmu *pmu)
 685 {
 686         char path[PATH_MAX];
 687         size_t len;
 688         int events_dir_fd, ret;
 689
 690         if (pmu->sysfs_aliases_loaded)
 691                 return 0;
 692
 693         len = perf_pmu__event_source_devices_scnprintf(path, sizeof(path));
 694         if (!len)
 695                 return 0;
 696         scnprintf(path + len, sizeof(path) - len, "%s/events", pmu->name);
 697
 698         events_dir_fd = open(path, O_DIRECTORY);
 699         if (events_dir_fd == -1) {
 700                 pmu->sysfs_aliases_loaded = true;
 701                 return 0;
 702         }
 703         ret = __pmu_aliases_parse(pmu, events_dir_fd);
 704         close(events_dir_fd);
 705         return ret;
 706 }
 707
 708 static int pmu_aliases_parse_eager(struct perf_pmu *pmu, int sysfs_fd)
 709 {
 710         char path[FILENAME_MAX + 7];
 711         int ret, events_dir_fd;
 712
 713         scnprintf(path, sizeof(path), "%s/events", pmu->name);
 714         events_dir_fd = openat(sysfs_fd, path, O_DIRECTORY, 0);
 715         if (events_dir_fd == -1) {
 716                 pmu->sysfs_aliases_loaded = true;
 717                 return 0;
 718         }
 719         ret = __pmu_aliases_parse(pmu, events_dir_fd);
 720         close(events_dir_fd);
 721         return ret;
 722 }
 723
 724 static int pmu_alias_terms(struct perf_pmu_alias *alias, int err_loc, struct list_head *terms)
 725 {
 726         struct parse_events_term *term, *cloned;
 727         struct parse_events_terms clone_terms;
 728
 729         parse_events_terms__init(&clone_terms);
 730         list_for_each_entry(term, &alias->terms.terms, list) {
 731                 int ret = parse_events_term__clone(&cloned, term);
 732
 733                 if (ret) {
 734                         parse_events_terms__exit(&clone_terms);
 735                         return ret;
 736                 }
 737                 /*
 738                  * Weak terms don't override command line options,
 739                  * which we don't want for implicit terms in aliases.
 740                  */
 741                 cloned->weak = true;
 742                 cloned->err_term = cloned->err_val = err_loc;
 743                 list_add_tail(&cloned->list, &clone_terms.terms);
 744         }
 745         list_splice_init(&clone_terms.terms, terms);
 746         parse_events_terms__exit(&clone_terms);
 747         return 0;
 748 }
 749
 750 /*
 751  * Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64)
 752  * may have a "cpus" file.
 753  */
 754 static struct perf_cpu_map *pmu_cpumask(int dirfd, const char *name, bool is_core)
 755 {
 756         struct perf_cpu_map *cpus;
 757         const char *templates[] = {
 758                 "cpumask",
 759                 "cpus",
 760                 NULL
 761         };
 762         const char **template;
 763         char pmu_name[PATH_MAX];
 764         struct perf_pmu pmu = {.name = pmu_name};
 765         FILE *file;
 766
 767         strlcpy(pmu_name, name, sizeof(pmu_name));
 768         for (template = templates; *template; template++) {
 769                 file = perf_pmu__open_file_at(&pmu, dirfd, *template);
 770                 if (!file)
 771                         continue;
 772                 cpus = perf_cpu_map__read(file);
 773                 fclose(file);
 774                 if (cpus)
 775                         return cpus;
 776         }
 777
 778         /* Nothing found, for core PMUs assume this means all CPUs. */
 779         return is_core ? perf_cpu_map__get(cpu_map__online()) : NULL;
 780 }
 781
 782 static bool pmu_is_uncore(int dirfd, const char *name)
 783 {
 784         int fd;
 785
 786         fd = perf_pmu__pathname_fd(dirfd, name, "cpumask", O_PATH);
 787         if (fd < 0)
 788                 return false;
 789
 790         close(fd);
 791         return true;
 792 }
 793
 794 static char *pmu_id(const char *name)
 795 {
 796         char path[PATH_MAX], *str;
 797         size_t len;
 798
 799         perf_pmu__pathname_scnprintf(path, sizeof(path), name, "identifier");
 800
 801         if (filename__read_str(path, &str, &len) < 0)
 802                 return NULL;
 803
 804         str[len - 1] = 0; /* remove line feed */
 805
 806         return str;
 807 }
 808
 809 /**
 810  * is_sysfs_pmu_core() - PMU CORE devices have different name other than cpu in
 811  *         sysfs on some platforms like ARM or Intel hybrid. Looking for
 812  *         possible the cpus file in sysfs files to identify whether this is a
 813  *         core device.
 814  * @name: The PMU name such as "cpu_atom".
 815  */
 816 static int is_sysfs_pmu_core(const char *name)
 817 {
 818         char path[PATH_MAX];
 819
 820         if (!perf_pmu__pathname_scnprintf(path, sizeof(path), name, "cpus"))
 821                 return 0;
 822         return file_available(path);
 823 }
 824
 825 char *perf_pmu__getcpuid(struct perf_pmu *pmu)
 826 {
 827         char *cpuid;
 828         static bool printed;
 829
 830         cpuid = getenv("PERF_CPUID");
 831         if (cpuid)
 832                 cpuid = strdup(cpuid);
 833         if (!cpuid)
 834                 cpuid = get_cpuid_str(pmu);
 835         if (!cpuid)
 836                 return NULL;
 837
 838         if (!printed) {
 839                 pr_debug("Using CPUID %s\n", cpuid);
 840                 printed = true;
 841         }
 842         return cpuid;
 843 }
 844
 845 __weak const struct pmu_metrics_table *pmu_metrics_table__find(void)
 846 {
 847         return perf_pmu__find_metrics_table(NULL);
 848 }
 849
 850 /**
 851  * perf_pmu__match_ignoring_suffix - Does the pmu_name match tok ignoring any
 852  *                                   trailing suffix? The Suffix must be in form
 853  *                                   tok_{digits}, or tok{digits}.
 854  * @pmu_name: The pmu_name with possible suffix.
 855  * @tok: The possible match to pmu_name without suffix.
 856  */
 857 static bool perf_pmu__match_ignoring_suffix(const char *pmu_name, const char *tok)
 858 {
 859         const char *p;
 860
 861         if (strncmp(pmu_name, tok, strlen(tok)))
 862                 return false;
 863
 864         p = pmu_name + strlen(tok);
 865         if (*p == 0)
 866                 return true;
 867
 868         if (*p == '_')
 869                 ++p;
 870
 871         /* Ensure we end in a number */
 872         while (1) {
 873                 if (!isdigit(*p))
 874                         return false;
 875                 if (*(++p) == 0)
 876                         break;
 877         }
 878
 879         return true;
 880 }
 881
 882 /**
 883  * pmu_uncore_alias_match - does name match the PMU name?
 884  * @pmu_name: the json struct pmu_event name. This may lack a suffix (which
 885  *            matches) or be of the form "socket,pmuname" which will match
 886  *            "socketX_pmunameY".
 887  * @name: a real full PMU name as from sysfs.
 888  */
 889 static bool pmu_uncore_alias_match(const char *pmu_name, const char *name)
 890 {
 891         char *tmp = NULL, *tok, *str;
 892         bool res;
 893
 894         if (strchr(pmu_name, ',') == NULL)
 895                 return perf_pmu__match_ignoring_suffix(name, pmu_name);
 896
 897         str = strdup(pmu_name);
 898         if (!str)
 899                 return false;
 900
 901         /*
 902          * uncore alias may be from different PMU with common prefix
 903          */
 904         tok = strtok_r(str, ",", &tmp);
 905         if (strncmp(pmu_name, tok, strlen(tok))) {
 906                 res = false;
 907                 goto out;
 908         }
 909
 910         /*
 911          * Match more complex aliases where the alias name is a comma-delimited
 912          * list of tokens, orderly contained in the matching PMU name.
 913          *
 914          * Example: For alias "socket,pmuname" and PMU "socketX_pmunameY", we
 915          *          match "socket" in "socketX_pmunameY" and then "pmuname" in
 916          *          "pmunameY".
 917          */
 918         while (1) {
 919                 char *next_tok = strtok_r(NULL, ",", &tmp);
 920
 921                 name = strstr(name, tok);
 922                 if (!name ||
 923                     (!next_tok && !perf_pmu__match_ignoring_suffix(name, tok))) {
 924                         res = false;
 925                         goto out;
 926                 }
 927                 if (!next_tok)
 928                         break;
 929                 tok = next_tok;
 930                 name += strlen(tok);
 931         }
 932
 933         res = true;
 934 out:
 935         free(str);
 936         return res;
 937 }
 938
 939 bool pmu_uncore_identifier_match(const char *compat, const char *id)
 940 {
 941         regex_t re;
 942         regmatch_t pmatch[1];
 943         int match;
 944
 945         if (regcomp(&re, compat, REG_EXTENDED) != 0) {
 946                 /* Warn unable to generate match particular string. */
 947                 pr_info("Invalid regular expression %s\n", compat);
 948                 return false;
 949         }
 950
 951         match = !regexec(&re, id, 1, pmatch, 0);
 952         if (match) {
 953                 /* Ensure a full match. */
 954                 match = pmatch[0].rm_so == 0 && (size_t)pmatch[0].rm_eo == strlen(id);
 955         }
 956         regfree(&re);
 957
 958         return match;
 959 }
 960
 961 static int pmu_add_cpu_aliases_map_callback(const struct pmu_event *pe,
 962                                         const struct pmu_events_table *table __maybe_unused,
 963                                         void *vdata)
 964 {
 965         struct perf_pmu *pmu = vdata;
 966
 967         perf_pmu__new_alias(pmu, pe->name, pe->desc, pe->event, /*val_fd=*/ NULL,
 968                             pe, EVENT_SRC_CPU_JSON);
 969         return 0;
 970 }
 971
 972 /*
 973  * From the pmu_events_table, find the events that correspond to the given
 974  * PMU and add them to the list 'head'.
 975  */
 976 void pmu_add_cpu_aliases_table(struct perf_pmu *pmu, const struct pmu_events_table *table)
 977 {
 978         pmu_events_table__for_each_event(table, pmu, pmu_add_cpu_aliases_map_callback, pmu);
 979 }
 980
 981 static void pmu_add_cpu_aliases(struct perf_pmu *pmu)
 982 {
 983         if (!pmu->events_table)
 984                 return;
 985
 986         if (pmu->cpu_aliases_added)
 987                 return;
 988
 989         pmu_add_cpu_aliases_table(pmu, pmu->events_table);
 990         pmu->cpu_aliases_added = true;
 991 }
 992
 993 static int pmu_add_sys_aliases_iter_fn(const struct pmu_event *pe,
 994                                        const struct pmu_events_table *table __maybe_unused,
 995                                        void *vdata)
 996 {
 997         struct perf_pmu *pmu = vdata;
 998
 999         if (!pe->compat || !pe->pmu)
1000                 return 0;
1001
1002         if (pmu_uncore_alias_match(pe->pmu, pmu->name) &&
1003             pmu_uncore_identifier_match(pe->compat, pmu->id)) {
1004                 perf_pmu__new_alias(pmu,
1005                                 pe->name,
1006                                 pe->desc,
1007                                 pe->event,
1008                                 /*val_fd=*/ NULL,
1009                                 pe,
1010                                 EVENT_SRC_SYS_JSON);
1011         }
1012
1013         return 0;
1014 }
1015
1016 void pmu_add_sys_aliases(struct perf_pmu *pmu)
1017 {
1018         if (!pmu->id)
1019                 return;
1020
1021         pmu_for_each_sys_event(pmu_add_sys_aliases_iter_fn, pmu);
1022 }
1023
1024 static char *pmu_find_alias_name(struct perf_pmu *pmu, int dirfd)
1025 {
1026         FILE *file = perf_pmu__open_file_at(pmu, dirfd, "alias");
1027         char *line = NULL;
1028         size_t line_len = 0;
1029         ssize_t ret;
1030
1031         if (!file)
1032                 return NULL;
1033
1034         ret = getline(&line, &line_len, file);
1035         if (ret < 0) {
1036                 fclose(file);
1037                 return NULL;
1038         }
1039         /* Remove trailing newline. */
1040         if (ret > 0 && line[ret - 1] == '\n')
1041                 line[--ret] = '\0';
1042
1043         fclose(file);
1044         return line;
1045 }
1046
1047 static int pmu_max_precise(int dirfd, struct perf_pmu *pmu)
1048 {
1049         int max_precise = -1;
1050
1051         perf_pmu__scan_file_at(pmu, dirfd, "caps/max_precise", "%d", &max_precise);
1052         return max_precise;
1053 }
1054
1055 void __weak
1056 perf_pmu__arch_init(struct perf_pmu *pmu)
1057 {
1058         if (pmu->is_core)
1059                 pmu->mem_events = perf_mem_events;
1060 }
1061
1062 struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char *name,
1063                                   bool eager_load)
1064 {
1065         struct perf_pmu *pmu;
1066         __u32 type;
1067
1068         pmu = zalloc(sizeof(*pmu));
1069         if (!pmu)
1070                 return NULL;
1071
1072         pmu->name = strdup(name);
1073         if (!pmu->name)
1074                 goto err;
1075
1076         /*
1077          * Read type early to fail fast if a lookup name isn't a PMU. Ensure
1078          * that type value is successfully assigned (return 1).
1079          */
1080         if (perf_pmu__scan_file_at(pmu, dirfd, "type", "%u", &type) != 1)
1081                 goto err;
1082
1083         INIT_LIST_HEAD(&pmu->format);
1084         INIT_LIST_HEAD(&pmu->aliases);
1085         INIT_LIST_HEAD(&pmu->caps);
1086
1087         /*
1088          * The pmu data we store & need consists of the pmu
1089          * type value and format definitions. Load both right
1090          * now.
1091          */
1092         if (pmu_format(pmu, dirfd, name, eager_load))
1093                 goto err;
1094
1095         pmu->is_core = is_pmu_core(name);
1096         pmu->cpus = pmu_cpumask(dirfd, name, pmu->is_core);
1097
1098         pmu->type = type;
1099         pmu->is_uncore = pmu_is_uncore(dirfd, name);
1100         if (pmu->is_uncore)
1101                 pmu->id = pmu_id(name);
1102         pmu->max_precise = pmu_max_precise(dirfd, pmu);
1103         pmu->alias_name = pmu_find_alias_name(pmu, dirfd);
1104         pmu->events_table = perf_pmu__find_events_table(pmu);
1105         /*
1106          * Load the sys json events/aliases when loading the PMU as each event
1107          * may have a different compat regular expression. We therefore can't
1108          * know the number of sys json events/aliases without computing the
1109          * regular expressions for them all.
1110          */
1111         pmu_add_sys_aliases(pmu);
1112         list_add_tail(&pmu->list, pmus);
1113
1114         perf_pmu__arch_init(pmu);
1115
1116         if (eager_load)
1117                 pmu_aliases_parse_eager(pmu, dirfd);
1118
1119         return pmu;
1120 err:
1121         zfree(&pmu->name);
1122         free(pmu);
1123         return NULL;
1124 }
1125
1126 /* Creates the PMU when sysfs scanning fails. */
1127 struct perf_pmu *perf_pmu__create_placeholder_core_pmu(struct list_head *core_pmus)
1128 {
1129         struct perf_pmu *pmu = zalloc(sizeof(*pmu));
1130
1131         if (!pmu)
1132                 return NULL;
1133
1134         pmu->name = strdup("cpu");
1135         if (!pmu->name) {
1136                 free(pmu);
1137                 return NULL;
1138         }
1139
1140         pmu->is_core = true;
1141         pmu->type = PERF_TYPE_RAW;
1142         pmu->cpus = cpu_map__online();
1143
1144         INIT_LIST_HEAD(&pmu->format);
1145         INIT_LIST_HEAD(&pmu->aliases);
1146         INIT_LIST_HEAD(&pmu->caps);
1147         list_add_tail(&pmu->list, core_pmus);
1148         return pmu;
1149 }
1150
1151 void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu)
1152 {
1153         struct perf_pmu_format *format;
1154
1155         if (pmu->formats_checked)
1156                 return;
1157
1158         pmu->formats_checked = true;
1159
1160         /* fake pmu doesn't have format list */
1161         if (pmu == &perf_pmu__fake)
1162                 return;
1163
1164         list_for_each_entry(format, &pmu->format, list) {
1165                 perf_pmu_format__load(pmu, format);
1166                 if (format->value >= PERF_PMU_FORMAT_VALUE_CONFIG_END) {
1167                         pr_warning("WARNING: '%s' format '%s' requires 'perf_event_attr::config%d'"
1168                                    "which is not supported by this version of perf!\n",
1169                                    pmu->name, format->name, format->value);
1170                         return;
1171                 }
1172         }
1173 }
1174
1175 bool evsel__is_aux_event(const struct evsel *evsel)
1176 {
1177         struct perf_pmu *pmu = evsel__find_pmu(evsel);
1178
1179         return pmu && pmu->auxtrace;
1180 }
1181
1182 /*
1183  * Set @config_name to @val as long as the user hasn't already set or cleared it
1184  * by passing a config term on the command line.
1185  *
1186  * @val is the value to put into the bits specified by @config_name rather than
1187  * the bit pattern. It is shifted into position by this function, so to set
1188  * something to true, pass 1 for val rather than a pre shifted value.
1189  */
1190 #define field_prep(_mask, _val) (((_val) << (ffsll(_mask) - 1)) & (_mask))
1191 void evsel__set_config_if_unset(struct perf_pmu *pmu, struct evsel *evsel,
1192                                 const char *config_name, u64 val)
1193 {
1194         u64 user_bits = 0, bits;
1195         struct evsel_config_term *term = evsel__get_config_term(evsel, CFG_CHG);
1196
1197         if (term)
1198                 user_bits = term->val.cfg_chg;
1199
1200         bits = perf_pmu__format_bits(pmu, config_name);
1201
1202         /* Do nothing if the user changed the value */
1203         if (bits & user_bits)
1204                 return;
1205
1206         /* Otherwise replace it */
1207         evsel->core.attr.config &= ~bits;
1208         evsel->core.attr.config |= field_prep(bits, val);
1209 }
1210
1211 static struct perf_pmu_format *
1212 pmu_find_format(const struct list_head *formats, const char *name)
1213 {
1214         struct perf_pmu_format *format;
1215
1216         list_for_each_entry(format, formats, list)
1217                 if (!strcmp(format->name, name))
1218                         return format;
1219
1220         return NULL;
1221 }
1222
1223 __u64 perf_pmu__format_bits(struct perf_pmu *pmu, const char *name)
1224 {
1225         struct perf_pmu_format *format = pmu_find_format(&pmu->format, name);
1226         __u64 bits = 0;
1227         int fbit;
1228
1229         if (!format)
1230                 return 0;
1231
1232         for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS)
1233                 bits |= 1ULL << fbit;
1234
1235         return bits;
1236 }
1237
1238 int perf_pmu__format_type(struct perf_pmu *pmu, const char *name)
1239 {
1240         struct perf_pmu_format *format = pmu_find_format(&pmu->format, name);
1241
1242         if (!format)
1243                 return -1;
1244
1245         perf_pmu_format__load(pmu, format);
1246         return format->value;
1247 }
1248
1249 /*
1250  * Sets value based on the format definition (format parameter)
1251  * and unformatted value (value parameter).
1252  */
1253 static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v,
1254                              bool zero)
1255 {
1256         unsigned long fbit, vbit;
1257
1258         for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
1259
1260                 if (!test_bit(fbit, format))
1261                         continue;
1262
1263                 if (value & (1llu << vbit++))
1264                         *v |= (1llu << fbit);
1265                 else if (zero)
1266                         *v &= ~(1llu << fbit);
1267         }
1268 }
1269
1270 static __u64 pmu_format_max_value(const unsigned long *format)
1271 {
1272         int w;
1273
1274         w = bitmap_weight(format, PERF_PMU_FORMAT_BITS);
1275         if (!w)
1276                 return 0;
1277         if (w < 64)
1278                 return (1ULL << w) - 1;
1279         return -1;
1280 }
1281
1282 /*
1283  * Term is a string term, and might be a param-term. Try to look up it's value
1284  * in the remaining terms.
1285  * - We have a term like "base-or-format-term=param-term",
1286  * - We need to find the value supplied for "param-term" (with param-term named
1287  *   in a config string) later on in the term list.
1288  */
1289 static int pmu_resolve_param_term(struct parse_events_term *term,
1290                                   struct parse_events_terms *head_terms,
1291                                   __u64 *value)
1292 {
1293         struct parse_events_term *t;
1294
1295         list_for_each_entry(t, &head_terms->terms, list) {
1296                 if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM &&
1297                     t->config && !strcmp(t->config, term->config)) {
1298                         t->used = true;
1299                         *value = t->val.num;
1300                         return 0;
1301                 }
1302         }
1303
1304         if (verbose > 0)
1305                 printf("Required parameter '%s' not specified\n", term->config);
1306
1307         return -1;
1308 }
1309
1310 static char *pmu_formats_string(const struct list_head *formats)
1311 {
1312         struct perf_pmu_format *format;
1313         char *str = NULL;
1314         struct strbuf buf = STRBUF_INIT;
1315         unsigned int i = 0;
1316
1317         if (!formats)
1318                 return NULL;
1319
1320         /* sysfs exported terms */
1321         list_for_each_entry(format, formats, list)
1322                 if (strbuf_addf(&buf, i++ ? ",%s" : "%s", format->name) < 0)
1323                         goto error;
1324
1325         str = strbuf_detach(&buf, NULL);
1326 error:
1327         strbuf_release(&buf);
1328
1329         return str;
1330 }
1331
1332 /*
1333  * Setup one of config[12] attr members based on the
1334  * user input data - term parameter.
1335  */
1336 static int pmu_config_term(const struct perf_pmu *pmu,
1337                            struct perf_event_attr *attr,
1338                            struct parse_events_term *term,
1339                            struct parse_events_terms *head_terms,
1340                            bool zero, struct parse_events_error *err)
1341 {
1342         struct perf_pmu_format *format;
1343         __u64 *vp;
1344         __u64 val, max_val;
1345
1346         /*
1347          * If this is a parameter we've already used for parameterized-eval,
1348          * skip it in normal eval.
1349          */
1350         if (term->used)
1351                 return 0;
1352
1353         /*
1354          * Hardcoded terms should be already in, so nothing
1355          * to be done for them.
1356          */
1357         if (parse_events__is_hardcoded_term(term))
1358                 return 0;
1359
1360         format = pmu_find_format(&pmu->format, term->config);
1361         if (!format) {
1362                 char *pmu_term = pmu_formats_string(&pmu->format);
1363                 char *unknown_term;
1364                 char *help_msg;
1365
1366                 if (asprintf(&unknown_term,
1367                                 "unknown term '%s' for pmu '%s'",
1368                                 term->config, pmu->name) < 0)
1369                         unknown_term = NULL;
1370                 help_msg = parse_events_formats_error_string(pmu_term);
1371                 if (err) {
1372                         parse_events_error__handle(err, term->err_term,
1373                                                    unknown_term,
1374                                                    help_msg);
1375                 } else {
1376                         pr_debug("%s (%s)\n", unknown_term, help_msg);
1377                         free(unknown_term);
1378                 }
1379                 free(pmu_term);
1380                 return -EINVAL;
1381         }
1382         perf_pmu_format__load(pmu, format);
1383         switch (format->value) {
1384         case PERF_PMU_FORMAT_VALUE_CONFIG:
1385                 vp = &attr->config;
1386                 break;
1387         case PERF_PMU_FORMAT_VALUE_CONFIG1:
1388                 vp = &attr->config1;
1389                 break;
1390         case PERF_PMU_FORMAT_VALUE_CONFIG2:
1391                 vp = &attr->config2;
1392                 break;
1393         case PERF_PMU_FORMAT_VALUE_CONFIG3:
1394                 vp = &attr->config3;
1395                 break;
1396         default:
1397                 return -EINVAL;
1398         }
1399
1400         /*
1401          * Either directly use a numeric term, or try to translate string terms
1402          * using event parameters.
1403          */
1404         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
1405                 if (term->no_value &&
1406                     bitmap_weight(format->bits, PERF_PMU_FORMAT_BITS) > 1) {
1407                         if (err) {
1408                                 parse_events_error__handle(err, term->err_val,
1409                                            strdup("no value assigned for term"),
1410                                            NULL);
1411                         }
1412                         return -EINVAL;
1413                 }
1414
1415                 val = term->val.num;
1416         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
1417                 if (strcmp(term->val.str, "?")) {
1418                         if (verbose > 0) {
1419                                 pr_info("Invalid sysfs entry %s=%s\n",
1420                                                 term->config, term->val.str);
1421                         }
1422                         if (err) {
1423                                 parse_events_error__handle(err, term->err_val,
1424                                         strdup("expected numeric value"),
1425                                         NULL);
1426                         }
1427                         return -EINVAL;
1428                 }
1429
1430                 if (pmu_resolve_param_term(term, head_terms, &val))
1431                         return -EINVAL;
1432         } else
1433                 return -EINVAL;
1434
1435         max_val = pmu_format_max_value(format->bits);
1436         if (val > max_val) {
1437                 if (err) {
1438                         char *err_str;
1439
1440                         parse_events_error__handle(err, term->err_val,
1441                                 asprintf(&err_str,
1442                                     "value too big for format (%s), maximum is %llu",
1443                                     format->name, (unsigned long long)max_val) < 0
1444                                     ? strdup("value too big for format")
1445                                     : err_str,
1446                                     NULL);
1447                         return -EINVAL;
1448                 }
1449                 /*
1450                  * Assume we don't care if !err, in which case the value will be
1451                  * silently truncated.
1452                  */
1453         }
1454
1455         pmu_format_value(format->bits, val, vp, zero);
1456         return 0;
1457 }
1458
1459 int perf_pmu__config_terms(const struct perf_pmu *pmu,
1460                            struct perf_event_attr *attr,
1461                            struct parse_events_terms *terms,
1462                            bool zero, struct parse_events_error *err)
1463 {
1464         struct parse_events_term *term;
1465
1466         list_for_each_entry(term, &terms->terms, list) {
1467                 if (pmu_config_term(pmu, attr, term, terms, zero, err))
1468                         return -EINVAL;
1469         }
1470
1471         return 0;
1472 }
1473
1474 /*
1475  * Configures event's 'attr' parameter based on the:
1476  * 1) users input - specified in terms parameter
1477  * 2) pmu format definitions - specified by pmu parameter
1478  */
1479 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
1480                      struct parse_events_terms *head_terms,
1481                      struct parse_events_error *err)
1482 {
1483         bool zero = !!pmu->perf_event_attr_init_default;
1484
1485         return perf_pmu__config_terms(pmu, attr, head_terms, zero, err);
1486 }
1487
1488 static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu,
1489                                              struct parse_events_term *term)
1490 {
1491         struct perf_pmu_alias *alias;
1492         const char *name;
1493
1494         if (parse_events__is_hardcoded_term(term))
1495                 return NULL;
1496
1497         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
1498                 if (!term->no_value)
1499                         return NULL;
1500                 if (pmu_find_format(&pmu->format, term->config))
1501                         return NULL;
1502                 name = term->config;
1503
1504         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
1505                 if (strcasecmp(term->config, "event"))
1506                         return NULL;
1507                 name = term->val.str;
1508         } else {
1509                 return NULL;
1510         }
1511
1512         alias = perf_pmu__find_alias(pmu, name, /*load=*/ true);
1513         if (alias || pmu->cpu_aliases_added)
1514                 return alias;
1515
1516         /* Alias doesn't exist, try to get it from the json events. */
1517         if (pmu->events_table &&
1518             pmu_events_table__find_event(pmu->events_table, pmu, name,
1519                                          pmu_add_cpu_aliases_map_callback,
1520                                          pmu) == 0) {
1521                 alias = perf_pmu__find_alias(pmu, name, /*load=*/ false);
1522         }
1523         return alias;
1524 }
1525
1526
1527 static int check_info_data(struct perf_pmu *pmu,
1528                            struct perf_pmu_alias *alias,
1529                            struct perf_pmu_info *info,
1530                            struct parse_events_error *err,
1531                            int column)
1532 {
1533         read_alias_info(pmu, alias);
1534         /*
1535          * Only one term in event definition can
1536          * define unit, scale and snapshot, fail
1537          * if there's more than one.
1538          */
1539         if (info->unit && alias->unit[0]) {
1540                 parse_events_error__handle(err, column,
1541                                         strdup("Attempt to set event's unit twice"),
1542                                         NULL);
1543                 return -EINVAL;
1544         }
1545         if (info->scale && alias->scale) {
1546                 parse_events_error__handle(err, column,
1547                                         strdup("Attempt to set event's scale twice"),
1548                                         NULL);
1549                 return -EINVAL;
1550         }
1551         if (info->snapshot && alias->snapshot) {
1552                 parse_events_error__handle(err, column,
1553                                         strdup("Attempt to set event snapshot twice"),
1554                                         NULL);
1555                 return -EINVAL;
1556         }
1557
1558         if (alias->unit[0])
1559                 info->unit = alias->unit;
1560
1561         if (alias->scale)
1562                 info->scale = alias->scale;
1563
1564         if (alias->snapshot)
1565                 info->snapshot = alias->snapshot;
1566
1567         return 0;
1568 }
1569
1570 /*
1571  * Find alias in the terms list and replace it with the terms
1572  * defined for the alias
1573  */
1574 int perf_pmu__check_alias(struct perf_pmu *pmu, struct parse_events_terms *head_terms,
1575                           struct perf_pmu_info *info, bool *rewrote_terms,
1576                           struct parse_events_error *err)
1577 {
1578         struct parse_events_term *term, *h;
1579         struct perf_pmu_alias *alias;
1580         int ret;
1581
1582         *rewrote_terms = false;
1583         info->per_pkg = false;
1584
1585         /*
1586          * Mark unit and scale as not set
1587          * (different from default values, see below)
1588          */
1589         info->unit     = NULL;
1590         info->scale    = 0.0;
1591         info->snapshot = false;
1592
1593         list_for_each_entry_safe(term, h, &head_terms->terms, list) {
1594                 alias = pmu_find_alias(pmu, term);
1595                 if (!alias)
1596                         continue;
1597                 ret = pmu_alias_terms(alias, term->err_term, &term->list);
1598                 if (ret) {
1599                         parse_events_error__handle(err, term->err_term,
1600                                                 strdup("Failure to duplicate terms"),
1601                                                 NULL);
1602                         return ret;
1603                 }
1604                 *rewrote_terms = true;
1605                 ret = check_info_data(pmu, alias, info, err, term->err_term);
1606                 if (ret)
1607                         return ret;
1608
1609                 if (alias->per_pkg)
1610                         info->per_pkg = true;
1611
1612                 list_del_init(&term->list);
1613                 parse_events_term__delete(term);
1614         }
1615
1616         /*
1617          * if no unit or scale found in aliases, then
1618          * set defaults as for evsel
1619          * unit cannot left to NULL
1620          */
1621         if (info->unit == NULL)
1622                 info->unit   = "";
1623
1624         if (info->scale == 0.0)
1625                 info->scale  = 1.0;
1626
1627         return 0;
1628 }
1629
1630 struct find_event_args {
1631         const char *event;
1632         void *state;
1633         pmu_event_callback cb;
1634 };
1635
1636 static int find_event_callback(void *state, struct pmu_event_info *info)
1637 {
1638         struct find_event_args *args = state;
1639
1640         if (!strcmp(args->event, info->name))
1641                 return args->cb(args->state, info);
1642
1643         return 0;
1644 }
1645
1646 int perf_pmu__find_event(struct perf_pmu *pmu, const char *event, void *state, pmu_event_callback cb)
1647 {
1648         struct find_event_args args = {
1649                 .event = event,
1650                 .state = state,
1651                 .cb = cb,
1652         };
1653
1654         /* Sub-optimal, but function is only used by tests. */
1655         return perf_pmu__for_each_event(pmu, /*skip_duplicate_pmus=*/ false,
1656                                         &args, find_event_callback);
1657 }
1658
1659 static void perf_pmu__del_formats(struct list_head *formats)
1660 {
1661         struct perf_pmu_format *fmt, *tmp;
1662
1663         list_for_each_entry_safe(fmt, tmp, formats, list) {
1664                 list_del(&fmt->list);
1665                 zfree(&fmt->name);
1666                 free(fmt);
1667         }
1668 }
1669
1670 bool perf_pmu__has_format(const struct perf_pmu *pmu, const char *name)
1671 {
1672         struct perf_pmu_format *format;
1673
1674         list_for_each_entry(format, &pmu->format, list) {
1675                 if (!strcmp(format->name, name))
1676                         return true;
1677         }
1678         return false;
1679 }
1680
1681 int perf_pmu__for_each_format(struct perf_pmu *pmu, void *state, pmu_format_callback cb)
1682 {
1683         static const char *const terms[] = {
1684                 "config=0..0xffffffffffffffff",
1685                 "config1=0..0xffffffffffffffff",
1686                 "config2=0..0xffffffffffffffff",
1687                 "config3=0..0xffffffffffffffff",
1688                 "name=string",
1689                 "period=number",
1690                 "freq=number",
1691                 "branch_type=(u|k|hv|any|...)",
1692                 "time",
1693                 "call-graph=(fp|dwarf|lbr)",
1694                 "stack-size=number",
1695                 "max-stack=number",
1696                 "nr=number",
1697                 "inherit",
1698                 "no-inherit",
1699                 "overwrite",
1700                 "no-overwrite",
1701                 "percore",
1702                 "aux-output",
1703                 "aux-sample-size=number",
1704         };
1705         struct perf_pmu_format *format;
1706         int ret;
1707
1708         /*
1709          * max-events and driver-config are missing above as are the internal
1710          * types user, metric-id, raw, legacy cache and hardware. Assert against
1711          * the enum parse_events__term_type so they are kept in sync.
1712          */
1713         _Static_assert(ARRAY_SIZE(terms) == __PARSE_EVENTS__TERM_TYPE_NR - 6,
1714                        "perf_pmu__for_each_format()'s terms must be kept in sync with enum parse_events__term_type");
1715         list_for_each_entry(format, &pmu->format, list) {
1716                 perf_pmu_format__load(pmu, format);
1717                 ret = cb(state, format->name, (int)format->value, format->bits);
1718                 if (ret)
1719                         return ret;
1720         }
1721         if (!pmu->is_core)
1722                 return 0;
1723
1724         for (size_t i = 0; i < ARRAY_SIZE(terms); i++) {
1725                 int config = PERF_PMU_FORMAT_VALUE_CONFIG;
1726
1727                 if (i < PERF_PMU_FORMAT_VALUE_CONFIG_END)
1728                         config = i;
1729
1730                 ret = cb(state, terms[i], config, /*bits=*/NULL);
1731                 if (ret)
1732                         return ret;
1733         }
1734         return 0;
1735 }
1736
1737 bool is_pmu_core(const char *name)
1738 {
1739         return !strcmp(name, "cpu") || !strcmp(name, "cpum_cf") || is_sysfs_pmu_core(name);
1740 }
1741
1742 bool perf_pmu__supports_legacy_cache(const struct perf_pmu *pmu)
1743 {
1744         return pmu->is_core;
1745 }
1746
1747 bool perf_pmu__auto_merge_stats(const struct perf_pmu *pmu)
1748 {
1749         return !pmu->is_core || perf_pmus__num_core_pmus() == 1;
1750 }
1751
1752 bool perf_pmu__have_event(struct perf_pmu *pmu, const char *name)
1753 {
1754         if (!name)
1755                 return false;
1756         if (perf_pmu__find_alias(pmu, name, /*load=*/ true) != NULL)
1757                 return true;
1758         if (pmu->cpu_aliases_added || !pmu->events_table)
1759                 return false;
1760         return pmu_events_table__find_event(pmu->events_table, pmu, name, NULL, NULL) == 0;
1761 }
1762
1763 size_t perf_pmu__num_events(struct perf_pmu *pmu)
1764 {
1765         size_t nr;
1766
1767         pmu_aliases_parse(pmu);
1768         nr = pmu->sysfs_aliases + pmu->sys_json_aliases;;
1769
1770         if (pmu->cpu_aliases_added)
1771                  nr += pmu->cpu_json_aliases;
1772         else if (pmu->events_table)
1773                 nr += pmu_events_table__num_events(pmu->events_table, pmu) - pmu->cpu_json_aliases;
1774         else
1775                 assert(pmu->cpu_json_aliases == 0);
1776
1777         return pmu->selectable ? nr + 1 : nr;
1778 }
1779
1780 static int sub_non_neg(int a, int b)
1781 {
1782         if (b > a)
1783                 return 0;
1784         return a - b;
1785 }
1786
1787 static char *format_alias(char *buf, int len, const struct perf_pmu *pmu,
1788                           const struct perf_pmu_alias *alias, bool skip_duplicate_pmus)
1789 {
1790         struct parse_events_term *term;
1791         int pmu_name_len = skip_duplicate_pmus
1792                 ? pmu_name_len_no_suffix(pmu->name, /*num=*/NULL)
1793                 : (int)strlen(pmu->name);
1794         int used = snprintf(buf, len, "%.*s/%s", pmu_name_len, pmu->name, alias->name);
1795
1796         list_for_each_entry(term, &alias->terms.terms, list) {
1797                 if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR)
1798                         used += snprintf(buf + used, sub_non_neg(len, used),
1799                                         ",%s=%s", term->config,
1800                                         term->val.str);
1801         }
1802
1803         if (sub_non_neg(len, used) > 0) {
1804                 buf[used] = '/';
1805                 used++;
1806         }
1807         if (sub_non_neg(len, used) > 0) {
1808                 buf[used] = '\0';
1809                 used++;
1810         } else
1811                 buf[len - 1] = '\0';
1812
1813         return buf;
1814 }
1815
1816 int perf_pmu__for_each_event(struct perf_pmu *pmu, bool skip_duplicate_pmus,
1817                              void *state, pmu_event_callback cb)
1818 {
1819         char buf[1024];
1820         struct perf_pmu_alias *event;
1821         struct pmu_event_info info = {
1822                 .pmu = pmu,
1823         };
1824         int ret = 0;
1825         struct strbuf sb;
1826
1827         strbuf_init(&sb, /*hint=*/ 0);
1828         pmu_aliases_parse(pmu);
1829         pmu_add_cpu_aliases(pmu);
1830         list_for_each_entry(event, &pmu->aliases, list) {
1831                 size_t buf_used;
1832                 int pmu_name_len;
1833
1834                 info.pmu_name = event->pmu_name ?: pmu->name;
1835                 pmu_name_len = skip_duplicate_pmus
1836                         ? pmu_name_len_no_suffix(info.pmu_name, /*num=*/NULL)
1837                         : (int)strlen(info.pmu_name);
1838                 info.alias = NULL;
1839                 if (event->desc) {
1840                         info.name = event->name;
1841                         buf_used = 0;
1842                 } else {
1843                         info.name = format_alias(buf, sizeof(buf), pmu, event,
1844                                                  skip_duplicate_pmus);
1845                         if (pmu->is_core) {
1846                                 info.alias = info.name;
1847                                 info.name = event->name;
1848                         }
1849                         buf_used = strlen(buf) + 1;
1850                 }
1851                 info.scale_unit = NULL;
1852                 if (strlen(event->unit) || event->scale != 1.0) {
1853                         info.scale_unit = buf + buf_used;
1854                         buf_used += snprintf(buf + buf_used, sizeof(buf) - buf_used,
1855                                         "%G%s", event->scale, event->unit) + 1;
1856                 }
1857                 info.desc = event->desc;
1858                 info.long_desc = event->long_desc;
1859                 info.encoding_desc = buf + buf_used;
1860                 parse_events_terms__to_strbuf(&event->terms, &sb);
1861                 buf_used += snprintf(buf + buf_used, sizeof(buf) - buf_used,
1862                                 "%.*s/%s/", pmu_name_len, info.pmu_name, sb.buf) + 1;
1863                 info.topic = event->topic;
1864                 info.str = sb.buf;
1865                 info.deprecated = event->deprecated;
1866                 ret = cb(state, &info);
1867                 if (ret)
1868                         goto out;
1869                 strbuf_setlen(&sb, /*len=*/ 0);
1870         }
1871         if (pmu->selectable) {
1872                 info.name = buf;
1873                 snprintf(buf, sizeof(buf), "%s//", pmu->name);
1874                 info.alias = NULL;
1875                 info.scale_unit = NULL;
1876                 info.desc = NULL;
1877                 info.long_desc = NULL;
1878                 info.encoding_desc = NULL;
1879                 info.topic = NULL;
1880                 info.pmu_name = pmu->name;
1881                 info.deprecated = false;
1882                 ret = cb(state, &info);
1883         }
1884 out:
1885         strbuf_release(&sb);
1886         return ret;
1887 }
1888
1889 bool pmu__name_match(const struct perf_pmu *pmu, const char *pmu_name)
1890 {
1891         return !strcmp(pmu->name, pmu_name) ||
1892                 (pmu->is_uncore && pmu_uncore_alias_match(pmu_name, pmu->name)) ||
1893                 /*
1894                  * jevents and tests use default_core as a marker for any core
1895                  * PMU as the PMU name varies across architectures.
1896                  */
1897                 (pmu->is_core && !strcmp(pmu_name, "default_core"));
1898 }
1899
1900 bool perf_pmu__is_software(const struct perf_pmu *pmu)
1901 {
1902         const char *known_sw_pmus[] = {
1903                 "kprobe",
1904                 "msr",
1905                 "uprobe",
1906         };
1907
1908         if (pmu->is_core || pmu->is_uncore || pmu->auxtrace)
1909                 return false;
1910         switch (pmu->type) {
1911         case PERF_TYPE_HARDWARE:        return false;
1912         case PERF_TYPE_SOFTWARE:        return true;
1913         case PERF_TYPE_TRACEPOINT:      return true;
1914         case PERF_TYPE_HW_CACHE:        return false;
1915         case PERF_TYPE_RAW:             return false;
1916         case PERF_TYPE_BREAKPOINT:      return true;
1917         default: break;
1918         }
1919         for (size_t i = 0; i < ARRAY_SIZE(known_sw_pmus); i++) {
1920                 if (!strcmp(pmu->name, known_sw_pmus[i]))
1921                         return true;
1922         }
1923         return false;
1924 }
1925
1926 FILE *perf_pmu__open_file(const struct perf_pmu *pmu, const char *name)
1927 {
1928         char path[PATH_MAX];
1929
1930         if (!perf_pmu__pathname_scnprintf(path, sizeof(path), pmu->name, name) ||
1931             !file_available(path))
1932                 return NULL;
1933
1934         return fopen(path, "r");
1935 }
1936
1937 FILE *perf_pmu__open_file_at(const struct perf_pmu *pmu, int dirfd, const char *name)
1938 {
1939         int fd;
1940
1941         fd = perf_pmu__pathname_fd(dirfd, pmu->name, name, O_RDONLY);
1942         if (fd < 0)
1943                 return NULL;
1944
1945         return fdopen(fd, "r");
1946 }
1947
1948 int perf_pmu__scan_file(const struct perf_pmu *pmu, const char *name, const char *fmt,
1949                         ...)
1950 {
1951         va_list args;
1952         FILE *file;
1953         int ret = EOF;
1954
1955         va_start(args, fmt);
1956         file = perf_pmu__open_file(pmu, name);
1957         if (file) {
1958                 ret = vfscanf(file, fmt, args);
1959                 fclose(file);
1960         }
1961         va_end(args);
1962         return ret;
1963 }
1964
1965 int perf_pmu__scan_file_at(const struct perf_pmu *pmu, int dirfd, const char *name,
1966                            const char *fmt, ...)
1967 {
1968         va_list args;
1969         FILE *file;
1970         int ret = EOF;
1971
1972         va_start(args, fmt);
1973         file = perf_pmu__open_file_at(pmu, dirfd, name);
1974         if (file) {
1975                 ret = vfscanf(file, fmt, args);
1976                 fclose(file);
1977         }
1978         va_end(args);
1979         return ret;
1980 }
1981
1982 bool perf_pmu__file_exists(const struct perf_pmu *pmu, const char *name)
1983 {
1984         char path[PATH_MAX];
1985
1986         if (!perf_pmu__pathname_scnprintf(path, sizeof(path), pmu->name, name))
1987                 return false;
1988
1989         return file_available(path);
1990 }
1991
1992 static int perf_pmu__new_caps(struct list_head *list, char *name, char *value)
1993 {
1994         struct perf_pmu_caps *caps = zalloc(sizeof(*caps));
1995
1996         if (!caps)
1997                 return -ENOMEM;
1998
1999         caps->name = strdup(name);
2000         if (!caps->name)
2001                 goto free_caps;
2002         caps->value = strndup(value, strlen(value) - 1);
2003         if (!caps->value)
2004                 goto free_name;
2005         list_add_tail(&caps->list, list);
2006         return 0;
2007
2008 free_name:
2009         zfree(&caps->name);
2010 free_caps:
2011         free(caps);
2012
2013         return -ENOMEM;
2014 }
2015
2016 static void perf_pmu__del_caps(struct perf_pmu *pmu)
2017 {
2018         struct perf_pmu_caps *caps, *tmp;
2019
2020         list_for_each_entry_safe(caps, tmp, &pmu->caps, list) {
2021                 list_del(&caps->list);
2022                 zfree(&caps->name);
2023                 zfree(&caps->value);
2024                 free(caps);
2025         }
2026 }
2027
2028 /*
2029  * Reading/parsing the given pmu capabilities, which should be located at:
2030  * /sys/bus/event_source/devices/<dev>/caps as sysfs group attributes.
2031  * Return the number of capabilities
2032  */
2033 int perf_pmu__caps_parse(struct perf_pmu *pmu)
2034 {
2035         struct stat st;
2036         char caps_path[PATH_MAX];
2037         DIR *caps_dir;
2038         struct dirent *evt_ent;
2039         int caps_fd;
2040
2041         if (pmu->caps_initialized)
2042                 return pmu->nr_caps;
2043
2044         pmu->nr_caps = 0;
2045
2046         if (!perf_pmu__pathname_scnprintf(caps_path, sizeof(caps_path), pmu->name, "caps"))
2047                 return -1;
2048
2049         if (stat(caps_path, &st) < 0) {
2050                 pmu->caps_initialized = true;
2051                 return 0;       /* no error if caps does not exist */
2052         }
2053
2054         caps_dir = opendir(caps_path);
2055         if (!caps_dir)
2056                 return -EINVAL;
2057
2058         caps_fd = dirfd(caps_dir);
2059
2060         while ((evt_ent = readdir(caps_dir)) != NULL) {
2061                 char *name = evt_ent->d_name;
2062                 char value[128];
2063                 FILE *file;
2064                 int fd;
2065
2066                 if (!strcmp(name, ".") || !strcmp(name, ".."))
2067                         continue;
2068
2069                 fd = openat(caps_fd, name, O_RDONLY);
2070                 if (fd == -1)
2071                         continue;
2072                 file = fdopen(fd, "r");
2073                 if (!file) {
2074                         close(fd);
2075                         continue;
2076                 }
2077
2078                 if (!fgets(value, sizeof(value), file) ||
2079                     (perf_pmu__new_caps(&pmu->caps, name, value) < 0)) {
2080                         fclose(file);
2081                         continue;
2082                 }
2083
2084                 pmu->nr_caps++;
2085                 fclose(file);
2086         }
2087
2088         closedir(caps_dir);
2089
2090         pmu->caps_initialized = true;
2091         return pmu->nr_caps;
2092 }
2093
2094 static void perf_pmu__compute_config_masks(struct perf_pmu *pmu)
2095 {
2096         struct perf_pmu_format *format;
2097
2098         if (pmu->config_masks_computed)
2099                 return;
2100
2101         list_for_each_entry(format, &pmu->format, list) {
2102                 unsigned int i;
2103                 __u64 *mask;
2104
2105                 if (format->value >= PERF_PMU_FORMAT_VALUE_CONFIG_END)
2106                         continue;
2107
2108                 pmu->config_masks_present = true;
2109                 mask = &pmu->config_masks[format->value];
2110
2111                 for_each_set_bit(i, format->bits, PERF_PMU_FORMAT_BITS)
2112                         *mask |= 1ULL << i;
2113         }
2114         pmu->config_masks_computed = true;
2115 }
2116
2117 void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config,
2118                                    const char *name, int config_num,
2119                                    const char *config_name)
2120 {
2121         __u64 bits;
2122         char buf[100];
2123
2124         perf_pmu__compute_config_masks(pmu);
2125
2126         /*
2127          * Kernel doesn't export any valid format bits.
2128          */
2129         if (!pmu->config_masks_present)
2130                 return;
2131
2132         bits = config & ~pmu->config_masks[config_num];
2133         if (bits == 0)
2134                 return;
2135
2136         bitmap_scnprintf((unsigned long *)&bits, sizeof(bits) * 8, buf, sizeof(buf));
2137
2138         pr_warning("WARNING: event '%s' not valid (bits %s of %s "
2139                    "'%llx' not supported by kernel)!\n",
2140                    name ?: "N/A", buf, config_name, config);
2141 }
2142
2143 bool perf_pmu__match(const struct perf_pmu *pmu, const char *tok)
2144 {
2145         const char *name = pmu->name;
2146         bool need_fnmatch = strchr(tok, '*') != NULL;
2147
2148         if (!strncmp(tok, "uncore_", 7))
2149                 tok += 7;
2150         if (!strncmp(name, "uncore_", 7))
2151                 name += 7;
2152
2153         if (perf_pmu__match_ignoring_suffix(name, tok) ||
2154             (need_fnmatch && !fnmatch(tok, name, 0)))
2155                 return true;
2156
2157         name = pmu->alias_name;
2158         if (!name)
2159                 return false;
2160
2161         if (!strncmp(name, "uncore_", 7))
2162                 name += 7;
2163
2164         return perf_pmu__match_ignoring_suffix(name, tok) ||
2165                 (need_fnmatch && !fnmatch(tok, name, 0));
2166 }
2167
2168 double __weak perf_pmu__cpu_slots_per_cycle(void)
2169 {
2170         return NAN;
2171 }
2172
2173 int perf_pmu__event_source_devices_scnprintf(char *pathname, size_t size)
2174 {
2175         const char *sysfs = sysfs__mountpoint();
2176
2177         if (!sysfs)
2178                 return 0;
2179         return scnprintf(pathname, size, "%s/bus/event_source/devices/", sysfs);
2180 }
2181
2182 int perf_pmu__event_source_devices_fd(void)
2183 {
2184         char path[PATH_MAX];
2185         const char *sysfs = sysfs__mountpoint();
2186
2187         if (!sysfs)
2188                 return -1;
2189
2190         scnprintf(path, sizeof(path), "%s/bus/event_source/devices/", sysfs);
2191         return open(path, O_DIRECTORY);
2192 }
2193
2194 /*
2195  * Fill 'buf' with the path to a file or folder in 'pmu_name' in
2196  * sysfs. For example if pmu_name = "cs_etm" and 'filename' = "format"
2197  * then pathname will be filled with
2198  * "/sys/bus/event_source/devices/cs_etm/format"
2199  *
2200  * Return 0 if the sysfs mountpoint couldn't be found, if no characters were
2201  * written or if the buffer size is exceeded.
2202  */
2203 int perf_pmu__pathname_scnprintf(char *buf, size_t size,
2204                                  const char *pmu_name, const char *filename)
2205 {
2206         size_t len;
2207
2208         len = perf_pmu__event_source_devices_scnprintf(buf, size);
2209         if (!len || (len + strlen(pmu_name) + strlen(filename) + 1)  >= size)
2210                 return 0;
2211
2212         return scnprintf(buf + len, size - len, "%s/%s", pmu_name, filename);
2213 }
2214
2215 int perf_pmu__pathname_fd(int dirfd, const char *pmu_name, const char *filename, int flags)
2216 {
2217         char path[PATH_MAX];
2218
2219         scnprintf(path, sizeof(path), "%s/%s", pmu_name, filename);
2220         return openat(dirfd, path, flags);
2221 }
2222
2223 void perf_pmu__delete(struct perf_pmu *pmu)
2224 {
2225         perf_pmu__del_formats(&pmu->format);
2226         perf_pmu__del_aliases(pmu);
2227         perf_pmu__del_caps(pmu);
2228
2229         perf_cpu_map__put(pmu->cpus);
2230
2231         zfree(&pmu->name);
2232         zfree(&pmu->alias_name);
2233         zfree(&pmu->id);
2234         free(pmu);
2235 }
2236
2237 const char *perf_pmu__name_from_config(struct perf_pmu *pmu, u64 config)
2238 {
2239         struct perf_pmu_alias *event;
2240
2241         if (!pmu)
2242                 return NULL;
2243
2244         pmu_aliases_parse(pmu);
2245         pmu_add_cpu_aliases(pmu);
2246         list_for_each_entry(event, &pmu->aliases, list) {
2247                 struct perf_event_attr attr = {.config = 0,};
2248                 int ret = perf_pmu__config(pmu, &attr, &event->terms, NULL);
2249
2250                 if (ret == 0 && config == attr.config)
2251                         return event->name;
2252         }
2253         return NULL;
2254 }