tools/perf/util/pmu.c

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