tools/perf/util/pmu.c

   1
   2 #include <linux/list.h>
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <unistd.h>
   6 #include <stdio.h>
   7 #include <dirent.h>
   8 #include "sysfs.h"
   9 #include "util.h"
  10 #include "pmu.h"
  11 #include "parse-events.h"
  12
  13 int perf_pmu_parse(struct list_head *list, char *name);
  14 extern FILE *perf_pmu_in;
  15
  16 static LIST_HEAD(pmus);
  17
  18 /*
  19  * Parse & process all the sysfs attributes located under
  20  * the directory specified in 'dir' parameter.
  21  */
  22 static int pmu_format_parse(char *dir, struct list_head *head)
  23 {
  24         struct dirent *evt_ent;
  25         DIR *format_dir;
  26         int ret = 0;
  27
  28         format_dir = opendir(dir);
  29         if (!format_dir)
  30                 return -EINVAL;
  31
  32         while (!ret && (evt_ent = readdir(format_dir))) {
  33                 char path[PATH_MAX];
  34                 char *name = evt_ent->d_name;
  35                 FILE *file;
  36
  37                 if (!strcmp(name, ".") || !strcmp(name, ".."))
  38                         continue;
  39
  40                 snprintf(path, PATH_MAX, "%s/%s", dir, name);
  41
  42                 ret = -EINVAL;
  43                 file = fopen(path, "r");
  44                 if (!file)
  45                         break;
  46
  47                 perf_pmu_in = file;
  48                 ret = perf_pmu_parse(head, name);
  49                 fclose(file);
  50         }
  51
  52         closedir(format_dir);
  53         return ret;
  54 }
  55
  56 /*
  57  * Reading/parsing the default pmu format definition, which should be
  58  * located at:
  59  * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes.
  60  */
  61 static int pmu_format(char *name, struct list_head *format)
  62 {
  63         struct stat st;
  64         char path[PATH_MAX];
  65         const char *sysfs;
  66
  67         sysfs = sysfs_find_mountpoint();
  68         if (!sysfs)
  69                 return -1;
  70
  71         snprintf(path, PATH_MAX,
  72                  "%s/bus/event_source/devices/%s/format", sysfs, name);
  73
  74         if (stat(path, &st) < 0)
  75                 return 0;       /* no error if format does not exist */
  76
  77         if (pmu_format_parse(path, format))
  78                 return -1;
  79
  80         return 0;
  81 }
  82
  83 static int perf_pmu__new_alias(struct list_head *list, char *name, FILE *file)
  84 {
  85         struct perf_pmu__alias *alias;
  86         char buf[256];
  87         int ret;
  88
  89         ret = fread(buf, 1, sizeof(buf), file);
  90         if (ret == 0)
  91                 return -EINVAL;
  92         buf[ret] = 0;
  93
  94         alias = malloc(sizeof(*alias));
  95         if (!alias)
  96                 return -ENOMEM;
  97
  98         INIT_LIST_HEAD(&alias->terms);
  99         ret = parse_events_terms(&alias->terms, buf);
 100         if (ret) {
 101                 free(alias);
 102                 return ret;
 103         }
 104
 105         alias->name = strdup(name);
 106         list_add_tail(&alias->list, list);
 107         return 0;
 108 }
 109
 110 /*
 111  * Process all the sysfs attributes located under the directory
 112  * specified in 'dir' parameter.
 113  */
 114 static int pmu_aliases_parse(char *dir, struct list_head *head)
 115 {
 116         struct dirent *evt_ent;
 117         DIR *event_dir;
 118         int ret = 0;
 119
 120         event_dir = opendir(dir);
 121         if (!event_dir)
 122                 return -EINVAL;
 123
 124         while (!ret && (evt_ent = readdir(event_dir))) {
 125                 char path[PATH_MAX];
 126                 char *name = evt_ent->d_name;
 127                 FILE *file;
 128
 129                 if (!strcmp(name, ".") || !strcmp(name, ".."))
 130                         continue;
 131
 132                 snprintf(path, PATH_MAX, "%s/%s", dir, name);
 133
 134                 ret = -EINVAL;
 135                 file = fopen(path, "r");
 136                 if (!file)
 137                         break;
 138                 ret = perf_pmu__new_alias(head, name, file);
 139                 fclose(file);
 140         }
 141
 142         closedir(event_dir);
 143         return ret;
 144 }
 145
 146 /*
 147  * Reading the pmu event aliases definition, which should be located at:
 148  * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes.
 149  */
 150 static int pmu_aliases(char *name, struct list_head *head)
 151 {
 152         struct stat st;
 153         char path[PATH_MAX];
 154         const char *sysfs;
 155
 156         sysfs = sysfs_find_mountpoint();
 157         if (!sysfs)
 158                 return -1;
 159
 160         snprintf(path, PATH_MAX,
 161                  "%s/bus/event_source/devices/%s/events", sysfs, name);
 162
 163         if (stat(path, &st) < 0)
 164                 return -1;
 165
 166         if (pmu_aliases_parse(path, head))
 167                 return -1;
 168
 169         return 0;
 170 }
 171
 172 static int pmu_alias_terms(struct perf_pmu__alias *alias,
 173                            struct list_head *terms)
 174 {
 175         struct parse_events__term *term, *clone;
 176         LIST_HEAD(list);
 177         int ret;
 178
 179         list_for_each_entry(term, &alias->terms, list) {
 180                 ret = parse_events__term_clone(&clone, term);
 181                 if (ret) {
 182                         parse_events__free_terms(&list);
 183                         return ret;
 184                 }
 185                 list_add_tail(&clone->list, &list);
 186         }
 187         list_splice(&list, terms);
 188         return 0;
 189 }
 190
 191 /*
 192  * Reading/parsing the default pmu type value, which should be
 193  * located at:
 194  * /sys/bus/event_source/devices/<dev>/type as sysfs attribute.
 195  */
 196 static int pmu_type(char *name, __u32 *type)
 197 {
 198         struct stat st;
 199         char path[PATH_MAX];
 200         const char *sysfs;
 201         FILE *file;
 202         int ret = 0;
 203
 204         sysfs = sysfs_find_mountpoint();
 205         if (!sysfs)
 206                 return -1;
 207
 208         snprintf(path, PATH_MAX,
 209                  "%s/bus/event_source/devices/%s/type", sysfs, name);
 210
 211         if (stat(path, &st) < 0)
 212                 return -1;
 213
 214         file = fopen(path, "r");
 215         if (!file)
 216                 return -EINVAL;
 217
 218         if (1 != fscanf(file, "%u", type))
 219                 ret = -1;
 220
 221         fclose(file);
 222         return ret;
 223 }
 224
 225 static struct perf_pmu *pmu_lookup(char *name)
 226 {
 227         struct perf_pmu *pmu;
 228         LIST_HEAD(format);
 229         LIST_HEAD(aliases);
 230         __u32 type;
 231
 232         /*
 233          * The pmu data we store & need consists of the pmu
 234          * type value and format definitions. Load both right
 235          * now.
 236          */
 237         if (pmu_format(name, &format))
 238                 return NULL;
 239
 240         if (pmu_type(name, &type))
 241                 return NULL;
 242
 243         pmu = zalloc(sizeof(*pmu));
 244         if (!pmu)
 245                 return NULL;
 246
 247         pmu_aliases(name, &aliases);
 248
 249         INIT_LIST_HEAD(&pmu->format);
 250         INIT_LIST_HEAD(&pmu->aliases);
 251         list_splice(&format, &pmu->format);
 252         list_splice(&aliases, &pmu->aliases);
 253         pmu->name = strdup(name);
 254         pmu->type = type;
 255         list_add_tail(&pmu->list, &pmus);
 256         return pmu;
 257 }
 258
 259 static struct perf_pmu *pmu_find(char *name)
 260 {
 261         struct perf_pmu *pmu;
 262
 263         list_for_each_entry(pmu, &pmus, list)
 264                 if (!strcmp(pmu->name, name))
 265                         return pmu;
 266
 267         return NULL;
 268 }
 269
 270 struct perf_pmu *perf_pmu__find(char *name)
 271 {
 272         struct perf_pmu *pmu;
 273
 274         /*
 275          * Once PMU is loaded it stays in the list,
 276          * so we keep us from multiple reading/parsing
 277          * the pmu format definitions.
 278          */
 279         pmu = pmu_find(name);
 280         if (pmu)
 281                 return pmu;
 282
 283         return pmu_lookup(name);
 284 }
 285
 286 static struct perf_pmu__format*
 287 pmu_find_format(struct list_head *formats, char *name)
 288 {
 289         struct perf_pmu__format *format;
 290
 291         list_for_each_entry(format, formats, list)
 292                 if (!strcmp(format->name, name))
 293                         return format;
 294
 295         return NULL;
 296 }
 297
 298 /*
 299  * Returns value based on the format definition (format parameter)
 300  * and unformated value (value parameter).
 301  *
 302  * TODO maybe optimize a little ;)
 303  */
 304 static __u64 pmu_format_value(unsigned long *format, __u64 value)
 305 {
 306         unsigned long fbit, vbit;
 307         __u64 v = 0;
 308
 309         for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) {
 310
 311                 if (!test_bit(fbit, format))
 312                         continue;
 313
 314                 if (!(value & (1llu << vbit++)))
 315                         continue;
 316
 317                 v |= (1llu << fbit);
 318         }
 319
 320         return v;
 321 }
 322
 323 /*
 324  * Setup one of config[12] attr members based on the
 325  * user input data - temr parameter.
 326  */
 327 static int pmu_config_term(struct list_head *formats,
 328                            struct perf_event_attr *attr,
 329                            struct parse_events__term *term)
 330 {
 331         struct perf_pmu__format *format;
 332         __u64 *vp;
 333
 334         /*
 335          * Support only for hardcoded and numnerial terms.
 336          * Hardcoded terms should be already in, so nothing
 337          * to be done for them.
 338          */
 339         if (parse_events__is_hardcoded_term(term))
 340                 return 0;
 341
 342         if (term->type_val != PARSE_EVENTS__TERM_TYPE_NUM)
 343                 return -EINVAL;
 344
 345         format = pmu_find_format(formats, term->config);
 346         if (!format)
 347                 return -EINVAL;
 348
 349         switch (format->value) {
 350         case PERF_PMU_FORMAT_VALUE_CONFIG:
 351                 vp = &attr->config;
 352                 break;
 353         case PERF_PMU_FORMAT_VALUE_CONFIG1:
 354                 vp = &attr->config1;
 355                 break;
 356         case PERF_PMU_FORMAT_VALUE_CONFIG2:
 357                 vp = &attr->config2;
 358                 break;
 359         default:
 360                 return -EINVAL;
 361         }
 362
 363         /*
 364          * XXX If we ever decide to go with string values for
 365          * non-hardcoded terms, here's the place to translate
 366          * them into value.
 367          */
 368         *vp |= pmu_format_value(format->bits, term->val.num);
 369         return 0;
 370 }
 371
 372 static int pmu_config(struct list_head *formats, struct perf_event_attr *attr,
 373                       struct list_head *head_terms)
 374 {
 375         struct parse_events__term *term;
 376
 377         list_for_each_entry(term, head_terms, list)
 378                 if (pmu_config_term(formats, attr, term))
 379                         return -EINVAL;
 380
 381         return 0;
 382 }
 383
 384 /*
 385  * Configures event's 'attr' parameter based on the:
 386  * 1) users input - specified in terms parameter
 387  * 2) pmu format definitions - specified by pmu parameter
 388  */
 389 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr,
 390                      struct list_head *head_terms)
 391 {
 392         attr->type = pmu->type;
 393         return pmu_config(&pmu->format, attr, head_terms);
 394 }
 395
 396 static struct perf_pmu__alias *pmu_find_alias(struct perf_pmu *pmu,
 397                                               struct parse_events__term *term)
 398 {
 399         struct perf_pmu__alias *alias;
 400         char *name;
 401
 402         if (parse_events__is_hardcoded_term(term))
 403                 return NULL;
 404
 405         if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) {
 406                 if (term->val.num != 1)
 407                         return NULL;
 408                 if (pmu_find_format(&pmu->format, term->config))
 409                         return NULL;
 410                 name = term->config;
 411         } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) {
 412                 if (strcasecmp(term->config, "event"))
 413                         return NULL;
 414                 name = term->val.str;
 415         } else {
 416                 return NULL;
 417         }
 418
 419         list_for_each_entry(alias, &pmu->aliases, list) {
 420                 if (!strcasecmp(alias->name, name))
 421                         return alias;
 422         }
 423         return NULL;
 424 }
 425
 426 /*
 427  * Find alias in the terms list and replace it with the terms
 428  * defined for the alias
 429  */
 430 int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms)
 431 {
 432         struct parse_events__term *term, *h;
 433         struct perf_pmu__alias *alias;
 434         int ret;
 435
 436         list_for_each_entry_safe(term, h, head_terms, list) {
 437                 alias = pmu_find_alias(pmu, term);
 438                 if (!alias)
 439                         continue;
 440                 ret = pmu_alias_terms(alias, &term->list);
 441                 if (ret)
 442                         return ret;
 443                 list_del(&term->list);
 444                 free(term);
 445         }
 446         return 0;
 447 }
 448
 449 int perf_pmu__new_format(struct list_head *list, char *name,
 450                          int config, unsigned long *bits)
 451 {
 452         struct perf_pmu__format *format;
 453
 454         format = zalloc(sizeof(*format));
 455         if (!format)
 456                 return -ENOMEM;
 457
 458         format->name = strdup(name);
 459         format->value = config;
 460         memcpy(format->bits, bits, sizeof(format->bits));
 461
 462         list_add_tail(&format->list, list);
 463         return 0;
 464 }
 465
 466 void perf_pmu__set_format(unsigned long *bits, long from, long to)
 467 {
 468         long b;
 469
 470         if (!to)
 471                 to = from;
 472
 473         memset(bits, 0, BITS_TO_LONGS(PERF_PMU_FORMAT_BITS));
 474         for (b = from; b <= to; b++)
 475                 set_bit(b, bits);
 476 }
 477
 478 /* Simulated format definitions. */
 479 static struct test_format {
 480         const char *name;
 481         const char *value;
 482 } test_formats[] = {
 483         { "krava01", "config:0-1,62-63\n", },
 484         { "krava02", "config:10-17\n", },
 485         { "krava03", "config:5\n", },
 486         { "krava11", "config1:0,2,4,6,8,20-28\n", },
 487         { "krava12", "config1:63\n", },
 488         { "krava13", "config1:45-47\n", },
 489         { "krava21", "config2:0-3,10-13,20-23,30-33,40-43,50-53,60-63\n", },
 490         { "krava22", "config2:8,18,48,58\n", },
 491         { "krava23", "config2:28-29,38\n", },
 492 };
 493
 494 #define TEST_FORMATS_CNT (sizeof(test_formats) / sizeof(struct test_format))
 495
 496 /* Simulated users input. */
 497 static struct parse_events__term test_terms[] = {
 498         {
 499                 .config    = (char *) "krava01",
 500                 .val.num   = 15,
 501                 .type_val  = PARSE_EVENTS__TERM_TYPE_NUM,
 502                 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
 503         },
 504         {
 505                 .config    = (char *) "krava02",
 506                 .val.num   = 170,
 507                 .type_val  = PARSE_EVENTS__TERM_TYPE_NUM,
 508                 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
 509         },
 510         {
 511                 .config    = (char *) "krava03",
 512                 .val.num   = 1,
 513                 .type_val  = PARSE_EVENTS__TERM_TYPE_NUM,
 514                 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
 515         },
 516         {
 517                 .config    = (char *) "krava11",
 518                 .val.num   = 27,
 519                 .type_val  = PARSE_EVENTS__TERM_TYPE_NUM,
 520                 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
 521         },
 522         {
 523                 .config    = (char *) "krava12",
 524                 .val.num   = 1,
 525                 .type_val  = PARSE_EVENTS__TERM_TYPE_NUM,
 526                 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
 527         },
 528         {
 529                 .config    = (char *) "krava13",
 530                 .val.num   = 2,
 531                 .type_val  = PARSE_EVENTS__TERM_TYPE_NUM,
 532                 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
 533         },
 534         {
 535                 .config    = (char *) "krava21",
 536                 .val.num   = 119,
 537                 .type_val  = PARSE_EVENTS__TERM_TYPE_NUM,
 538                 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
 539         },
 540         {
 541                 .config    = (char *) "krava22",
 542                 .val.num   = 11,
 543                 .type_val  = PARSE_EVENTS__TERM_TYPE_NUM,
 544                 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
 545         },
 546         {
 547                 .config    = (char *) "krava23",
 548                 .val.num   = 2,
 549                 .type_val  = PARSE_EVENTS__TERM_TYPE_NUM,
 550                 .type_term = PARSE_EVENTS__TERM_TYPE_USER,
 551         },
 552 };
 553 #define TERMS_CNT (sizeof(test_terms) / sizeof(struct parse_events__term))
 554
 555 /*
 556  * Prepare format directory data, exported by kernel
 557  * at /sys/bus/event_source/devices/<dev>/format.
 558  */
 559 static char *test_format_dir_get(void)
 560 {
 561         static char dir[PATH_MAX];
 562         unsigned int i;
 563
 564         snprintf(dir, PATH_MAX, "/tmp/perf-pmu-test-format-XXXXXX");
 565         if (!mkdtemp(dir))
 566                 return NULL;
 567
 568         for (i = 0; i < TEST_FORMATS_CNT; i++) {
 569                 static char name[PATH_MAX];
 570                 struct test_format *format = &test_formats[i];
 571                 FILE *file;
 572
 573                 snprintf(name, PATH_MAX, "%s/%s", dir, format->name);
 574
 575                 file = fopen(name, "w");
 576                 if (!file)
 577                         return NULL;
 578
 579                 if (1 != fwrite(format->value, strlen(format->value), 1, file))
 580                         break;
 581
 582                 fclose(file);
 583         }
 584
 585         return dir;
 586 }
 587
 588 /* Cleanup format directory. */
 589 static int test_format_dir_put(char *dir)
 590 {
 591         char buf[PATH_MAX];
 592         snprintf(buf, PATH_MAX, "rm -f %s/*\n", dir);
 593         if (system(buf))
 594                 return -1;
 595
 596         snprintf(buf, PATH_MAX, "rmdir %s\n", dir);
 597         return system(buf);
 598 }
 599
 600 static struct list_head *test_terms_list(void)
 601 {
 602         static LIST_HEAD(terms);
 603         unsigned int i;
 604
 605         for (i = 0; i < TERMS_CNT; i++)
 606                 list_add_tail(&test_terms[i].list, &terms);
 607
 608         return &terms;
 609 }
 610
 611 #undef TERMS_CNT
 612
 613 int perf_pmu__test(void)
 614 {
 615         char *format = test_format_dir_get();
 616         LIST_HEAD(formats);
 617         struct list_head *terms = test_terms_list();
 618         int ret;
 619
 620         if (!format)
 621                 return -EINVAL;
 622
 623         do {
 624                 struct perf_event_attr attr;
 625
 626                 memset(&attr, 0, sizeof(attr));
 627
 628                 ret = pmu_format_parse(format, &formats);
 629                 if (ret)
 630                         break;
 631
 632                 ret = pmu_config(&formats, &attr, terms);
 633                 if (ret)
 634                         break;
 635
 636                 ret = -EINVAL;
 637
 638                 if (attr.config  != 0xc00000000002a823)
 639                         break;
 640                 if (attr.config1 != 0x8000400000000145)
 641                         break;
 642                 if (attr.config2 != 0x0400000020041d07)
 643                         break;
 644
 645                 ret = 0;
 646         } while (0);
 647
 648         test_format_dir_put(format);
 649         return ret;
 650 }