tools/perf/util/pmu.c

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