1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/list.h> 3 #include <linux/compiler.h> 4 #include <linux/string.h> 5 #include <linux/zalloc.h> 6 #include <linux/ctype.h> 7 #include <sys/types.h> 8 #include <fcntl.h> 9 #include <sys/stat.h> 10 #include <unistd.h> 11 #include <stdio.h> 12 #include <stdbool.h> 13 #include <dirent.h> 14 #include <api/fs/fs.h> 15 #include <locale.h> 16 #include <fnmatch.h> 17 #include <math.h> 18 #include "debug.h" 19 #include "evsel.h" 20 #include "pmu.h" 21 #include "pmus.h" 22 #include "pmu-bison.h" 23 #include "pmu-flex.h" 24 #include "parse-events.h" 25 #include "print-events.h" 26 #include "header.h" 27 #include "string2.h" 28 #include "strbuf.h" 29 #include "fncache.h" 30 #include "util/evsel_config.h" 31 32 struct perf_pmu perf_pmu__fake; 33 34 /** 35 * struct perf_pmu_format - Values from a format file read from 36 * <sysfs>/devices/cpu/format/ held in struct perf_pmu. 37 * 38 * For example, the contents of <sysfs>/devices/cpu/format/event may be 39 * "config:0-7" and will be represented here as name="event", 40 * value=PERF_PMU_FORMAT_VALUE_CONFIG and bits 0 to 7 will be set. 41 */ 42 struct perf_pmu_format { 43 /** @name: The modifier/file name. */ 44 char *name; 45 /** 46 * @value : Which config value the format relates to. Supported values 47 * are from PERF_PMU_FORMAT_VALUE_CONFIG to 48 * PERF_PMU_FORMAT_VALUE_CONFIG_END. 49 */ 50 int value; 51 /** @bits: Which config bits are set by this format value. */ 52 DECLARE_BITMAP(bits, PERF_PMU_FORMAT_BITS); 53 /** @list: Element on list within struct perf_pmu. */ 54 struct list_head list; 55 }; 56 57 /* 58 * Parse & process all the sysfs attributes located under 59 * the directory specified in 'dir' parameter. 60 */ 61 int perf_pmu__format_parse(int dirfd, struct list_head *head) 62 { 63 struct dirent *evt_ent; 64 DIR *format_dir; 65 int ret = 0; 66 67 format_dir = fdopendir(dirfd); 68 if (!format_dir) 69 return -EINVAL; 70 71 while (!ret && (evt_ent = readdir(format_dir))) { 72 char *name = evt_ent->d_name; 73 int fd; 74 void *scanner; 75 FILE *file; 76 77 if (!strcmp(name, ".") || !strcmp(name, "..")) 78 continue; 79 80 81 ret = -EINVAL; 82 fd = openat(dirfd, name, O_RDONLY); 83 if (fd < 0) 84 break; 85 86 file = fdopen(fd, "r"); 87 if (!file) { 88 close(fd); 89 break; 90 } 91 92 ret = perf_pmu_lex_init(&scanner); 93 if (ret) { 94 fclose(file); 95 break; 96 } 97 98 perf_pmu_set_in(file, scanner); 99 ret = perf_pmu_parse(head, name, scanner); 100 perf_pmu_lex_destroy(scanner); 101 fclose(file); 102 } 103 104 closedir(format_dir); 105 return ret; 106 } 107 108 /* 109 * Reading/parsing the default pmu format definition, which should be 110 * located at: 111 * /sys/bus/event_source/devices/<dev>/format as sysfs group attributes. 112 */ 113 static int pmu_format(int dirfd, const char *name, struct list_head *format) 114 { 115 int fd; 116 117 fd = perf_pmu__pathname_fd(dirfd, name, "format", O_DIRECTORY); 118 if (fd < 0) 119 return 0; 120 121 /* it'll close the fd */ 122 if (perf_pmu__format_parse(fd, format)) 123 return -1; 124 125 return 0; 126 } 127 128 int perf_pmu__convert_scale(const char *scale, char **end, double *sval) 129 { 130 char *lc; 131 int ret = 0; 132 133 /* 134 * save current locale 135 */ 136 lc = setlocale(LC_NUMERIC, NULL); 137 138 /* 139 * The lc string may be allocated in static storage, 140 * so get a dynamic copy to make it survive setlocale 141 * call below. 142 */ 143 lc = strdup(lc); 144 if (!lc) { 145 ret = -ENOMEM; 146 goto out; 147 } 148 149 /* 150 * force to C locale to ensure kernel 151 * scale string is converted correctly. 152 * kernel uses default C locale. 153 */ 154 setlocale(LC_NUMERIC, "C"); 155 156 *sval = strtod(scale, end); 157 158 out: 159 /* restore locale */ 160 setlocale(LC_NUMERIC, lc); 161 free(lc); 162 return ret; 163 } 164 165 static int perf_pmu__parse_scale(struct perf_pmu_alias *alias, int dirfd, char *name) 166 { 167 struct stat st; 168 ssize_t sret; 169 char scale[128]; 170 int fd, ret = -1; 171 char path[PATH_MAX]; 172 173 scnprintf(path, PATH_MAX, "%s.scale", name); 174 175 fd = openat(dirfd, path, O_RDONLY); 176 if (fd == -1) 177 return -1; 178 179 if (fstat(fd, &st) < 0) 180 goto error; 181 182 sret = read(fd, scale, sizeof(scale)-1); 183 if (sret < 0) 184 goto error; 185 186 if (scale[sret - 1] == '\n') 187 scale[sret - 1] = '\0'; 188 else 189 scale[sret] = '\0'; 190 191 ret = perf_pmu__convert_scale(scale, NULL, &alias->scale); 192 error: 193 close(fd); 194 return ret; 195 } 196 197 static int perf_pmu__parse_unit(struct perf_pmu_alias *alias, int dirfd, char *name) 198 { 199 char path[PATH_MAX]; 200 ssize_t sret; 201 int fd; 202 203 scnprintf(path, PATH_MAX, "%s.unit", name); 204 205 fd = openat(dirfd, path, O_RDONLY); 206 if (fd == -1) 207 return -1; 208 209 sret = read(fd, alias->unit, UNIT_MAX_LEN); 210 if (sret < 0) 211 goto error; 212 213 close(fd); 214 215 if (alias->unit[sret - 1] == '\n') 216 alias->unit[sret - 1] = '\0'; 217 else 218 alias->unit[sret] = '\0'; 219 220 return 0; 221 error: 222 close(fd); 223 alias->unit[0] = '\0'; 224 return -1; 225 } 226 227 static int 228 perf_pmu__parse_per_pkg(struct perf_pmu_alias *alias, int dirfd, char *name) 229 { 230 char path[PATH_MAX]; 231 int fd; 232 233 scnprintf(path, PATH_MAX, "%s.per-pkg", name); 234 235 fd = openat(dirfd, path, O_RDONLY); 236 if (fd == -1) 237 return -1; 238 239 close(fd); 240 241 alias->per_pkg = true; 242 return 0; 243 } 244 245 static int perf_pmu__parse_snapshot(struct perf_pmu_alias *alias, 246 int dirfd, char *name) 247 { 248 char path[PATH_MAX]; 249 int fd; 250 251 scnprintf(path, PATH_MAX, "%s.snapshot", name); 252 253 fd = openat(dirfd, path, O_RDONLY); 254 if (fd == -1) 255 return -1; 256 257 alias->snapshot = true; 258 close(fd); 259 return 0; 260 } 261 262 static void perf_pmu_assign_str(char *name, const char *field, char **old_str, 263 char **new_str) 264 { 265 if (!*old_str) 266 goto set_new; 267 268 if (*new_str) { /* Have new string, check with old */ 269 if (strcasecmp(*old_str, *new_str)) 270 pr_debug("alias %s differs in field '%s'\n", 271 name, field); 272 zfree(old_str); 273 } else /* Nothing new --> keep old string */ 274 return; 275 set_new: 276 *old_str = *new_str; 277 *new_str = NULL; 278 } 279 280 static void perf_pmu_update_alias(struct perf_pmu_alias *old, 281 struct perf_pmu_alias *newalias) 282 { 283 perf_pmu_assign_str(old->name, "desc", &old->desc, &newalias->desc); 284 perf_pmu_assign_str(old->name, "long_desc", &old->long_desc, 285 &newalias->long_desc); 286 perf_pmu_assign_str(old->name, "topic", &old->topic, &newalias->topic); 287 perf_pmu_assign_str(old->name, "value", &old->str, &newalias->str); 288 old->scale = newalias->scale; 289 old->per_pkg = newalias->per_pkg; 290 old->snapshot = newalias->snapshot; 291 memcpy(old->unit, newalias->unit, sizeof(old->unit)); 292 } 293 294 /* Delete an alias entry. */ 295 void perf_pmu_free_alias(struct perf_pmu_alias *newalias) 296 { 297 zfree(&newalias->name); 298 zfree(&newalias->desc); 299 zfree(&newalias->long_desc); 300 zfree(&newalias->topic); 301 zfree(&newalias->str); 302 zfree(&newalias->pmu_name); 303 parse_events_terms__purge(&newalias->terms); 304 free(newalias); 305 } 306 307 static void perf_pmu__del_aliases(struct perf_pmu *pmu) 308 { 309 struct perf_pmu_alias *alias, *tmp; 310 311 list_for_each_entry_safe(alias, tmp, &pmu->aliases, list) { 312 list_del(&alias->list); 313 perf_pmu_free_alias(alias); 314 } 315 } 316 317 /* Merge an alias, search in alias list. If this name is already 318 * present merge both of them to combine all information. 319 */ 320 static bool perf_pmu_merge_alias(struct perf_pmu_alias *newalias, 321 struct list_head *alist) 322 { 323 struct perf_pmu_alias *a; 324 325 list_for_each_entry(a, alist, list) { 326 if (!strcasecmp(newalias->name, a->name)) { 327 if (newalias->pmu_name && a->pmu_name && 328 !strcasecmp(newalias->pmu_name, a->pmu_name)) { 329 continue; 330 } 331 perf_pmu_update_alias(a, newalias); 332 perf_pmu_free_alias(newalias); 333 return true; 334 } 335 } 336 return false; 337 } 338 339 static int __perf_pmu__new_alias(struct list_head *list, int dirfd, char *name, 340 char *desc, char *val, const struct pmu_event *pe) 341 { 342 struct parse_events_term *term; 343 struct perf_pmu_alias *alias; 344 int ret; 345 char newval[256]; 346 const char *long_desc = NULL, *topic = NULL, *unit = NULL, *pmu_name = NULL; 347 bool deprecated = false, perpkg = false; 348 349 if (pe) { 350 long_desc = pe->long_desc; 351 topic = pe->topic; 352 unit = pe->unit; 353 perpkg = pe->perpkg; 354 deprecated = pe->deprecated; 355 pmu_name = pe->pmu; 356 } 357 358 alias = malloc(sizeof(*alias)); 359 if (!alias) 360 return -ENOMEM; 361 362 INIT_LIST_HEAD(&alias->terms); 363 alias->scale = 1.0; 364 alias->unit[0] = '\0'; 365 alias->per_pkg = perpkg; 366 alias->snapshot = false; 367 alias->deprecated = deprecated; 368 369 ret = parse_events_terms(&alias->terms, val); 370 if (ret) { 371 pr_err("Cannot parse alias %s: %d\n", val, ret); 372 free(alias); 373 return ret; 374 } 375 376 /* Scan event and remove leading zeroes, spaces, newlines, some 377 * platforms have terms specified as 378 * event=0x0091 (read from files ../<PMU>/events/<FILE> 379 * and terms specified as event=0x91 (read from JSON files). 380 * 381 * Rebuild string to make alias->str member comparable. 382 */ 383 memset(newval, 0, sizeof(newval)); 384 ret = 0; 385 list_for_each_entry(term, &alias->terms, list) { 386 if (ret) 387 ret += scnprintf(newval + ret, sizeof(newval) - ret, 388 ","); 389 if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) 390 ret += scnprintf(newval + ret, sizeof(newval) - ret, 391 "%s=%#x", term->config, term->val.num); 392 else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) 393 ret += scnprintf(newval + ret, sizeof(newval) - ret, 394 "%s=%s", term->config, term->val.str); 395 } 396 397 alias->name = strdup(name); 398 if (dirfd >= 0) { 399 /* 400 * load unit name and scale if available 401 */ 402 perf_pmu__parse_unit(alias, dirfd, name); 403 perf_pmu__parse_scale(alias, dirfd, name); 404 perf_pmu__parse_per_pkg(alias, dirfd, name); 405 perf_pmu__parse_snapshot(alias, dirfd, name); 406 } 407 408 alias->desc = desc ? strdup(desc) : NULL; 409 alias->long_desc = long_desc ? strdup(long_desc) : 410 desc ? strdup(desc) : NULL; 411 alias->topic = topic ? strdup(topic) : NULL; 412 if (unit) { 413 if (perf_pmu__convert_scale(unit, (char **)&unit, &alias->scale) < 0) 414 return -1; 415 snprintf(alias->unit, sizeof(alias->unit), "%s", unit); 416 } 417 alias->str = strdup(newval); 418 alias->pmu_name = pmu_name ? strdup(pmu_name) : NULL; 419 420 if (!perf_pmu_merge_alias(alias, list)) 421 list_add_tail(&alias->list, list); 422 423 return 0; 424 } 425 426 static int perf_pmu__new_alias(struct list_head *list, int dirfd, char *name, FILE *file) 427 { 428 char buf[256]; 429 int ret; 430 431 ret = fread(buf, 1, sizeof(buf), file); 432 if (ret == 0) 433 return -EINVAL; 434 435 buf[ret] = 0; 436 437 /* Remove trailing newline from sysfs file */ 438 strim(buf); 439 440 return __perf_pmu__new_alias(list, dirfd, name, NULL, buf, NULL); 441 } 442 443 static inline bool pmu_alias_info_file(char *name) 444 { 445 size_t len; 446 447 len = strlen(name); 448 if (len > 5 && !strcmp(name + len - 5, ".unit")) 449 return true; 450 if (len > 6 && !strcmp(name + len - 6, ".scale")) 451 return true; 452 if (len > 8 && !strcmp(name + len - 8, ".per-pkg")) 453 return true; 454 if (len > 9 && !strcmp(name + len - 9, ".snapshot")) 455 return true; 456 457 return false; 458 } 459 460 /* 461 * Process all the sysfs attributes located under the directory 462 * specified in 'dir' parameter. 463 */ 464 static int pmu_aliases_parse(int dirfd, struct list_head *head) 465 { 466 struct dirent *evt_ent; 467 DIR *event_dir; 468 int fd; 469 470 event_dir = fdopendir(dirfd); 471 if (!event_dir) 472 return -EINVAL; 473 474 while ((evt_ent = readdir(event_dir))) { 475 char *name = evt_ent->d_name; 476 FILE *file; 477 478 if (!strcmp(name, ".") || !strcmp(name, "..")) 479 continue; 480 481 /* 482 * skip info files parsed in perf_pmu__new_alias() 483 */ 484 if (pmu_alias_info_file(name)) 485 continue; 486 487 fd = openat(dirfd, name, O_RDONLY); 488 if (fd == -1) { 489 pr_debug("Cannot open %s\n", name); 490 continue; 491 } 492 file = fdopen(fd, "r"); 493 if (!file) { 494 close(fd); 495 continue; 496 } 497 498 if (perf_pmu__new_alias(head, dirfd, name, file) < 0) 499 pr_debug("Cannot set up %s\n", name); 500 fclose(file); 501 } 502 503 closedir(event_dir); 504 return 0; 505 } 506 507 /* 508 * Reading the pmu event aliases definition, which should be located at: 509 * /sys/bus/event_source/devices/<dev>/events as sysfs group attributes. 510 */ 511 static int pmu_aliases(int dirfd, const char *name, struct list_head *head) 512 { 513 int fd; 514 515 fd = perf_pmu__pathname_fd(dirfd, name, "events", O_DIRECTORY); 516 if (fd < 0) 517 return 0; 518 519 /* it'll close the fd */ 520 if (pmu_aliases_parse(fd, head)) 521 return -1; 522 523 return 0; 524 } 525 526 static int pmu_alias_terms(struct perf_pmu_alias *alias, 527 struct list_head *terms) 528 { 529 struct parse_events_term *term, *cloned; 530 LIST_HEAD(list); 531 int ret; 532 533 list_for_each_entry(term, &alias->terms, list) { 534 ret = parse_events_term__clone(&cloned, term); 535 if (ret) { 536 parse_events_terms__purge(&list); 537 return ret; 538 } 539 /* 540 * Weak terms don't override command line options, 541 * which we don't want for implicit terms in aliases. 542 */ 543 cloned->weak = true; 544 list_add_tail(&cloned->list, &list); 545 } 546 list_splice(&list, terms); 547 return 0; 548 } 549 550 /* 551 * Uncore PMUs have a "cpumask" file under sysfs. CPU PMUs (e.g. on arm/arm64) 552 * may have a "cpus" file. 553 */ 554 static struct perf_cpu_map *pmu_cpumask(int dirfd, const char *name, bool is_core) 555 { 556 struct perf_cpu_map *cpus; 557 const char *templates[] = { 558 "cpumask", 559 "cpus", 560 NULL 561 }; 562 const char **template; 563 char pmu_name[PATH_MAX]; 564 struct perf_pmu pmu = {.name = pmu_name}; 565 FILE *file; 566 567 strlcpy(pmu_name, name, sizeof(pmu_name)); 568 for (template = templates; *template; template++) { 569 file = perf_pmu__open_file_at(&pmu, dirfd, *template); 570 if (!file) 571 continue; 572 cpus = perf_cpu_map__read(file); 573 fclose(file); 574 if (cpus) 575 return cpus; 576 } 577 578 /* Nothing found, for core PMUs assume this means all CPUs. */ 579 return is_core ? perf_cpu_map__get(cpu_map__online()) : NULL; 580 } 581 582 static bool pmu_is_uncore(int dirfd, const char *name) 583 { 584 int fd; 585 586 fd = perf_pmu__pathname_fd(dirfd, name, "cpumask", O_PATH); 587 if (fd < 0) 588 return false; 589 590 close(fd); 591 return true; 592 } 593 594 static char *pmu_id(const char *name) 595 { 596 char path[PATH_MAX], *str; 597 size_t len; 598 599 perf_pmu__pathname_scnprintf(path, sizeof(path), name, "identifier"); 600 601 if (filename__read_str(path, &str, &len) < 0) 602 return NULL; 603 604 str[len - 1] = 0; /* remove line feed */ 605 606 return str; 607 } 608 609 /** 610 * is_sysfs_pmu_core() - PMU CORE devices have different name other than cpu in 611 * sysfs on some platforms like ARM or Intel hybrid. Looking for 612 * possible the cpus file in sysfs files to identify whether this is a 613 * core device. 614 * @name: The PMU name such as "cpu_atom". 615 */ 616 static int is_sysfs_pmu_core(const char *name) 617 { 618 char path[PATH_MAX]; 619 620 if (!perf_pmu__pathname_scnprintf(path, sizeof(path), name, "cpus")) 621 return 0; 622 return file_available(path); 623 } 624 625 char *perf_pmu__getcpuid(struct perf_pmu *pmu) 626 { 627 char *cpuid; 628 static bool printed; 629 630 cpuid = getenv("PERF_CPUID"); 631 if (cpuid) 632 cpuid = strdup(cpuid); 633 if (!cpuid) 634 cpuid = get_cpuid_str(pmu); 635 if (!cpuid) 636 return NULL; 637 638 if (!printed) { 639 pr_debug("Using CPUID %s\n", cpuid); 640 printed = true; 641 } 642 return cpuid; 643 } 644 645 __weak const struct pmu_events_table *pmu_events_table__find(void) 646 { 647 return perf_pmu__find_events_table(NULL); 648 } 649 650 __weak const struct pmu_metrics_table *pmu_metrics_table__find(void) 651 { 652 return perf_pmu__find_metrics_table(NULL); 653 } 654 655 /** 656 * perf_pmu__match_ignoring_suffix - Does the pmu_name match tok ignoring any 657 * trailing suffix? The Suffix must be in form 658 * tok_{digits}, or tok{digits}. 659 * @pmu_name: The pmu_name with possible suffix. 660 * @tok: The possible match to pmu_name without suffix. 661 */ 662 static bool perf_pmu__match_ignoring_suffix(const char *pmu_name, const char *tok) 663 { 664 const char *p; 665 666 if (strncmp(pmu_name, tok, strlen(tok))) 667 return false; 668 669 p = pmu_name + strlen(tok); 670 if (*p == 0) 671 return true; 672 673 if (*p == '_') 674 ++p; 675 676 /* Ensure we end in a number */ 677 while (1) { 678 if (!isdigit(*p)) 679 return false; 680 if (*(++p) == 0) 681 break; 682 } 683 684 return true; 685 } 686 687 /** 688 * pmu_uncore_alias_match - does name match the PMU name? 689 * @pmu_name: the json struct pmu_event name. This may lack a suffix (which 690 * matches) or be of the form "socket,pmuname" which will match 691 * "socketX_pmunameY". 692 * @name: a real full PMU name as from sysfs. 693 */ 694 static bool pmu_uncore_alias_match(const char *pmu_name, const char *name) 695 { 696 char *tmp = NULL, *tok, *str; 697 bool res; 698 699 if (strchr(pmu_name, ',') == NULL) 700 return perf_pmu__match_ignoring_suffix(name, pmu_name); 701 702 str = strdup(pmu_name); 703 if (!str) 704 return false; 705 706 /* 707 * uncore alias may be from different PMU with common prefix 708 */ 709 tok = strtok_r(str, ",", &tmp); 710 if (strncmp(pmu_name, tok, strlen(tok))) { 711 res = false; 712 goto out; 713 } 714 715 /* 716 * Match more complex aliases where the alias name is a comma-delimited 717 * list of tokens, orderly contained in the matching PMU name. 718 * 719 * Example: For alias "socket,pmuname" and PMU "socketX_pmunameY", we 720 * match "socket" in "socketX_pmunameY" and then "pmuname" in 721 * "pmunameY". 722 */ 723 while (1) { 724 char *next_tok = strtok_r(NULL, ",", &tmp); 725 726 name = strstr(name, tok); 727 if (!name || 728 (!next_tok && !perf_pmu__match_ignoring_suffix(name, tok))) { 729 res = false; 730 goto out; 731 } 732 if (!next_tok) 733 break; 734 tok = next_tok; 735 name += strlen(tok); 736 } 737 738 res = true; 739 out: 740 free(str); 741 return res; 742 } 743 744 struct pmu_add_cpu_aliases_map_data { 745 /* List being added to. */ 746 struct list_head *head; 747 /* If a pmu_event lacks a given PMU the default used. */ 748 char *default_pmu_name; 749 /* The PMU that we're searching for events for. */ 750 struct perf_pmu *pmu; 751 }; 752 753 static int pmu_add_cpu_aliases_map_callback(const struct pmu_event *pe, 754 const struct pmu_events_table *table __maybe_unused, 755 void *vdata) 756 { 757 struct pmu_add_cpu_aliases_map_data *data = vdata; 758 const char *pname = pe->pmu ?: data->default_pmu_name; 759 760 if (!strcmp(pname, data->pmu->name) || 761 (data->pmu->is_uncore && pmu_uncore_alias_match(pname, data->pmu->name))) { 762 /* need type casts to override 'const' */ 763 __perf_pmu__new_alias(data->head, -1, (char *)pe->name, (char *)pe->desc, 764 (char *)pe->event, pe); 765 } 766 return 0; 767 } 768 769 /* 770 * From the pmu_events_table, find the events that correspond to the given 771 * PMU and add them to the list 'head'. 772 */ 773 void pmu_add_cpu_aliases_table(struct list_head *head, struct perf_pmu *pmu, 774 const struct pmu_events_table *table) 775 { 776 struct pmu_add_cpu_aliases_map_data data = { 777 .head = head, 778 .default_pmu_name = perf_pmus__default_pmu_name(), 779 .pmu = pmu, 780 }; 781 782 pmu_events_table_for_each_event(table, pmu_add_cpu_aliases_map_callback, &data); 783 free(data.default_pmu_name); 784 } 785 786 static void pmu_add_cpu_aliases(struct list_head *head, struct perf_pmu *pmu) 787 { 788 const struct pmu_events_table *table; 789 790 table = perf_pmu__find_events_table(pmu); 791 if (!table) 792 return; 793 794 pmu_add_cpu_aliases_table(head, pmu, table); 795 } 796 797 struct pmu_sys_event_iter_data { 798 struct list_head *head; 799 struct perf_pmu *pmu; 800 }; 801 802 static int pmu_add_sys_aliases_iter_fn(const struct pmu_event *pe, 803 const struct pmu_events_table *table __maybe_unused, 804 void *data) 805 { 806 struct pmu_sys_event_iter_data *idata = data; 807 struct perf_pmu *pmu = idata->pmu; 808 809 if (!pe->compat || !pe->pmu) 810 return 0; 811 812 if (!strcmp(pmu->id, pe->compat) && 813 pmu_uncore_alias_match(pe->pmu, pmu->name)) { 814 __perf_pmu__new_alias(idata->head, -1, 815 (char *)pe->name, 816 (char *)pe->desc, 817 (char *)pe->event, 818 pe); 819 } 820 821 return 0; 822 } 823 824 void pmu_add_sys_aliases(struct list_head *head, struct perf_pmu *pmu) 825 { 826 struct pmu_sys_event_iter_data idata = { 827 .head = head, 828 .pmu = pmu, 829 }; 830 831 if (!pmu->id) 832 return; 833 834 pmu_for_each_sys_event(pmu_add_sys_aliases_iter_fn, &idata); 835 } 836 837 struct perf_event_attr * __weak 838 perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused) 839 { 840 return NULL; 841 } 842 843 char * __weak 844 pmu_find_real_name(const char *name) 845 { 846 return (char *)name; 847 } 848 849 char * __weak 850 pmu_find_alias_name(const char *name __maybe_unused) 851 { 852 return NULL; 853 } 854 855 static int pmu_max_precise(int dirfd, struct perf_pmu *pmu) 856 { 857 int max_precise = -1; 858 859 perf_pmu__scan_file_at(pmu, dirfd, "caps/max_precise", "%d", &max_precise); 860 return max_precise; 861 } 862 863 struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char *lookup_name) 864 { 865 struct perf_pmu *pmu; 866 LIST_HEAD(format); 867 LIST_HEAD(aliases); 868 __u32 type; 869 char *name = pmu_find_real_name(lookup_name); 870 char *alias_name; 871 872 /* 873 * The pmu data we store & need consists of the pmu 874 * type value and format definitions. Load both right 875 * now. 876 */ 877 if (pmu_format(dirfd, name, &format)) 878 return NULL; 879 880 /* 881 * Check the aliases first to avoid unnecessary work. 882 */ 883 if (pmu_aliases(dirfd, name, &aliases)) 884 return NULL; 885 886 pmu = zalloc(sizeof(*pmu)); 887 if (!pmu) 888 return NULL; 889 890 pmu->is_core = is_pmu_core(name); 891 pmu->cpus = pmu_cpumask(dirfd, name, pmu->is_core); 892 pmu->name = strdup(name); 893 if (!pmu->name) 894 goto err; 895 896 /* Read type, and ensure that type value is successfully assigned (return 1) */ 897 if (perf_pmu__scan_file_at(pmu, dirfd, "type", "%u", &type) != 1) 898 goto err; 899 900 alias_name = pmu_find_alias_name(name); 901 if (alias_name) { 902 pmu->alias_name = strdup(alias_name); 903 if (!pmu->alias_name) 904 goto err; 905 } 906 907 pmu->type = type; 908 pmu->is_uncore = pmu_is_uncore(dirfd, name); 909 if (pmu->is_uncore) 910 pmu->id = pmu_id(name); 911 pmu->max_precise = pmu_max_precise(dirfd, pmu); 912 pmu_add_cpu_aliases(&aliases, pmu); 913 pmu_add_sys_aliases(&aliases, pmu); 914 915 INIT_LIST_HEAD(&pmu->format); 916 INIT_LIST_HEAD(&pmu->aliases); 917 INIT_LIST_HEAD(&pmu->caps); 918 list_splice(&format, &pmu->format); 919 list_splice(&aliases, &pmu->aliases); 920 list_add_tail(&pmu->list, pmus); 921 922 pmu->default_config = perf_pmu__get_default_config(pmu); 923 924 return pmu; 925 err: 926 zfree(&pmu->name); 927 free(pmu); 928 return NULL; 929 } 930 931 void perf_pmu__warn_invalid_formats(struct perf_pmu *pmu) 932 { 933 struct perf_pmu_format *format; 934 935 if (pmu->formats_checked) 936 return; 937 938 pmu->formats_checked = true; 939 940 /* fake pmu doesn't have format list */ 941 if (pmu == &perf_pmu__fake) 942 return; 943 944 list_for_each_entry(format, &pmu->format, list) 945 if (format->value >= PERF_PMU_FORMAT_VALUE_CONFIG_END) { 946 pr_warning("WARNING: '%s' format '%s' requires 'perf_event_attr::config%d'" 947 "which is not supported by this version of perf!\n", 948 pmu->name, format->name, format->value); 949 return; 950 } 951 } 952 953 bool evsel__is_aux_event(const struct evsel *evsel) 954 { 955 struct perf_pmu *pmu = evsel__find_pmu(evsel); 956 957 return pmu && pmu->auxtrace; 958 } 959 960 /* 961 * Set @config_name to @val as long as the user hasn't already set or cleared it 962 * by passing a config term on the command line. 963 * 964 * @val is the value to put into the bits specified by @config_name rather than 965 * the bit pattern. It is shifted into position by this function, so to set 966 * something to true, pass 1 for val rather than a pre shifted value. 967 */ 968 #define field_prep(_mask, _val) (((_val) << (ffsll(_mask) - 1)) & (_mask)) 969 void evsel__set_config_if_unset(struct perf_pmu *pmu, struct evsel *evsel, 970 const char *config_name, u64 val) 971 { 972 u64 user_bits = 0, bits; 973 struct evsel_config_term *term = evsel__get_config_term(evsel, CFG_CHG); 974 975 if (term) 976 user_bits = term->val.cfg_chg; 977 978 bits = perf_pmu__format_bits(&pmu->format, config_name); 979 980 /* Do nothing if the user changed the value */ 981 if (bits & user_bits) 982 return; 983 984 /* Otherwise replace it */ 985 evsel->core.attr.config &= ~bits; 986 evsel->core.attr.config |= field_prep(bits, val); 987 } 988 989 static struct perf_pmu_format * 990 pmu_find_format(struct list_head *formats, const char *name) 991 { 992 struct perf_pmu_format *format; 993 994 list_for_each_entry(format, formats, list) 995 if (!strcmp(format->name, name)) 996 return format; 997 998 return NULL; 999 } 1000 1001 __u64 perf_pmu__format_bits(struct list_head *formats, const char *name) 1002 { 1003 struct perf_pmu_format *format = pmu_find_format(formats, name); 1004 __u64 bits = 0; 1005 int fbit; 1006 1007 if (!format) 1008 return 0; 1009 1010 for_each_set_bit(fbit, format->bits, PERF_PMU_FORMAT_BITS) 1011 bits |= 1ULL << fbit; 1012 1013 return bits; 1014 } 1015 1016 int perf_pmu__format_type(struct list_head *formats, const char *name) 1017 { 1018 struct perf_pmu_format *format = pmu_find_format(formats, name); 1019 1020 if (!format) 1021 return -1; 1022 1023 return format->value; 1024 } 1025 1026 /* 1027 * Sets value based on the format definition (format parameter) 1028 * and unformatted value (value parameter). 1029 */ 1030 static void pmu_format_value(unsigned long *format, __u64 value, __u64 *v, 1031 bool zero) 1032 { 1033 unsigned long fbit, vbit; 1034 1035 for (fbit = 0, vbit = 0; fbit < PERF_PMU_FORMAT_BITS; fbit++) { 1036 1037 if (!test_bit(fbit, format)) 1038 continue; 1039 1040 if (value & (1llu << vbit++)) 1041 *v |= (1llu << fbit); 1042 else if (zero) 1043 *v &= ~(1llu << fbit); 1044 } 1045 } 1046 1047 static __u64 pmu_format_max_value(const unsigned long *format) 1048 { 1049 int w; 1050 1051 w = bitmap_weight(format, PERF_PMU_FORMAT_BITS); 1052 if (!w) 1053 return 0; 1054 if (w < 64) 1055 return (1ULL << w) - 1; 1056 return -1; 1057 } 1058 1059 /* 1060 * Term is a string term, and might be a param-term. Try to look up it's value 1061 * in the remaining terms. 1062 * - We have a term like "base-or-format-term=param-term", 1063 * - We need to find the value supplied for "param-term" (with param-term named 1064 * in a config string) later on in the term list. 1065 */ 1066 static int pmu_resolve_param_term(struct parse_events_term *term, 1067 struct list_head *head_terms, 1068 __u64 *value) 1069 { 1070 struct parse_events_term *t; 1071 1072 list_for_each_entry(t, head_terms, list) { 1073 if (t->type_val == PARSE_EVENTS__TERM_TYPE_NUM && 1074 t->config && !strcmp(t->config, term->config)) { 1075 t->used = true; 1076 *value = t->val.num; 1077 return 0; 1078 } 1079 } 1080 1081 if (verbose > 0) 1082 printf("Required parameter '%s' not specified\n", term->config); 1083 1084 return -1; 1085 } 1086 1087 static char *pmu_formats_string(struct list_head *formats) 1088 { 1089 struct perf_pmu_format *format; 1090 char *str = NULL; 1091 struct strbuf buf = STRBUF_INIT; 1092 unsigned int i = 0; 1093 1094 if (!formats) 1095 return NULL; 1096 1097 /* sysfs exported terms */ 1098 list_for_each_entry(format, formats, list) 1099 if (strbuf_addf(&buf, i++ ? ",%s" : "%s", format->name) < 0) 1100 goto error; 1101 1102 str = strbuf_detach(&buf, NULL); 1103 error: 1104 strbuf_release(&buf); 1105 1106 return str; 1107 } 1108 1109 /* 1110 * Setup one of config[12] attr members based on the 1111 * user input data - term parameter. 1112 */ 1113 static int pmu_config_term(const char *pmu_name, 1114 struct list_head *formats, 1115 struct perf_event_attr *attr, 1116 struct parse_events_term *term, 1117 struct list_head *head_terms, 1118 bool zero, struct parse_events_error *err) 1119 { 1120 struct perf_pmu_format *format; 1121 __u64 *vp; 1122 __u64 val, max_val; 1123 1124 /* 1125 * If this is a parameter we've already used for parameterized-eval, 1126 * skip it in normal eval. 1127 */ 1128 if (term->used) 1129 return 0; 1130 1131 /* 1132 * Hardcoded terms should be already in, so nothing 1133 * to be done for them. 1134 */ 1135 if (parse_events__is_hardcoded_term(term)) 1136 return 0; 1137 1138 format = pmu_find_format(formats, term->config); 1139 if (!format) { 1140 char *pmu_term = pmu_formats_string(formats); 1141 char *unknown_term; 1142 char *help_msg; 1143 1144 if (asprintf(&unknown_term, 1145 "unknown term '%s' for pmu '%s'", 1146 term->config, pmu_name) < 0) 1147 unknown_term = NULL; 1148 help_msg = parse_events_formats_error_string(pmu_term); 1149 if (err) { 1150 parse_events_error__handle(err, term->err_term, 1151 unknown_term, 1152 help_msg); 1153 } else { 1154 pr_debug("%s (%s)\n", unknown_term, help_msg); 1155 free(unknown_term); 1156 } 1157 free(pmu_term); 1158 return -EINVAL; 1159 } 1160 1161 switch (format->value) { 1162 case PERF_PMU_FORMAT_VALUE_CONFIG: 1163 vp = &attr->config; 1164 break; 1165 case PERF_PMU_FORMAT_VALUE_CONFIG1: 1166 vp = &attr->config1; 1167 break; 1168 case PERF_PMU_FORMAT_VALUE_CONFIG2: 1169 vp = &attr->config2; 1170 break; 1171 case PERF_PMU_FORMAT_VALUE_CONFIG3: 1172 vp = &attr->config3; 1173 break; 1174 default: 1175 return -EINVAL; 1176 } 1177 1178 /* 1179 * Either directly use a numeric term, or try to translate string terms 1180 * using event parameters. 1181 */ 1182 if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) { 1183 if (term->no_value && 1184 bitmap_weight(format->bits, PERF_PMU_FORMAT_BITS) > 1) { 1185 if (err) { 1186 parse_events_error__handle(err, term->err_val, 1187 strdup("no value assigned for term"), 1188 NULL); 1189 } 1190 return -EINVAL; 1191 } 1192 1193 val = term->val.num; 1194 } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) { 1195 if (strcmp(term->val.str, "?")) { 1196 if (verbose > 0) { 1197 pr_info("Invalid sysfs entry %s=%s\n", 1198 term->config, term->val.str); 1199 } 1200 if (err) { 1201 parse_events_error__handle(err, term->err_val, 1202 strdup("expected numeric value"), 1203 NULL); 1204 } 1205 return -EINVAL; 1206 } 1207 1208 if (pmu_resolve_param_term(term, head_terms, &val)) 1209 return -EINVAL; 1210 } else 1211 return -EINVAL; 1212 1213 max_val = pmu_format_max_value(format->bits); 1214 if (val > max_val) { 1215 if (err) { 1216 char *err_str; 1217 1218 parse_events_error__handle(err, term->err_val, 1219 asprintf(&err_str, 1220 "value too big for format, maximum is %llu", 1221 (unsigned long long)max_val) < 0 1222 ? strdup("value too big for format") 1223 : err_str, 1224 NULL); 1225 return -EINVAL; 1226 } 1227 /* 1228 * Assume we don't care if !err, in which case the value will be 1229 * silently truncated. 1230 */ 1231 } 1232 1233 pmu_format_value(format->bits, val, vp, zero); 1234 return 0; 1235 } 1236 1237 int perf_pmu__config_terms(const char *pmu_name, struct list_head *formats, 1238 struct perf_event_attr *attr, 1239 struct list_head *head_terms, 1240 bool zero, struct parse_events_error *err) 1241 { 1242 struct parse_events_term *term; 1243 1244 list_for_each_entry(term, head_terms, list) { 1245 if (pmu_config_term(pmu_name, formats, attr, term, head_terms, 1246 zero, err)) 1247 return -EINVAL; 1248 } 1249 1250 return 0; 1251 } 1252 1253 /* 1254 * Configures event's 'attr' parameter based on the: 1255 * 1) users input - specified in terms parameter 1256 * 2) pmu format definitions - specified by pmu parameter 1257 */ 1258 int perf_pmu__config(struct perf_pmu *pmu, struct perf_event_attr *attr, 1259 struct list_head *head_terms, 1260 struct parse_events_error *err) 1261 { 1262 bool zero = !!pmu->default_config; 1263 1264 return perf_pmu__config_terms(pmu->name, &pmu->format, attr, 1265 head_terms, zero, err); 1266 } 1267 1268 static struct perf_pmu_alias *pmu_find_alias(struct perf_pmu *pmu, 1269 struct parse_events_term *term) 1270 { 1271 struct perf_pmu_alias *alias; 1272 char *name; 1273 1274 if (parse_events__is_hardcoded_term(term)) 1275 return NULL; 1276 1277 if (term->type_val == PARSE_EVENTS__TERM_TYPE_NUM) { 1278 if (term->val.num != 1) 1279 return NULL; 1280 if (pmu_find_format(&pmu->format, term->config)) 1281 return NULL; 1282 name = term->config; 1283 } else if (term->type_val == PARSE_EVENTS__TERM_TYPE_STR) { 1284 if (strcasecmp(term->config, "event")) 1285 return NULL; 1286 name = term->val.str; 1287 } else { 1288 return NULL; 1289 } 1290 1291 list_for_each_entry(alias, &pmu->aliases, list) { 1292 if (!strcasecmp(alias->name, name)) 1293 return alias; 1294 } 1295 return NULL; 1296 } 1297 1298 1299 static int check_info_data(struct perf_pmu_alias *alias, 1300 struct perf_pmu_info *info) 1301 { 1302 /* 1303 * Only one term in event definition can 1304 * define unit, scale and snapshot, fail 1305 * if there's more than one. 1306 */ 1307 if ((info->unit && alias->unit[0]) || 1308 (info->scale && alias->scale) || 1309 (info->snapshot && alias->snapshot)) 1310 return -EINVAL; 1311 1312 if (alias->unit[0]) 1313 info->unit = alias->unit; 1314 1315 if (alias->scale) 1316 info->scale = alias->scale; 1317 1318 if (alias->snapshot) 1319 info->snapshot = alias->snapshot; 1320 1321 return 0; 1322 } 1323 1324 /* 1325 * Find alias in the terms list and replace it with the terms 1326 * defined for the alias 1327 */ 1328 int perf_pmu__check_alias(struct perf_pmu *pmu, struct list_head *head_terms, 1329 struct perf_pmu_info *info) 1330 { 1331 struct parse_events_term *term, *h; 1332 struct perf_pmu_alias *alias; 1333 int ret; 1334 1335 info->per_pkg = false; 1336 1337 /* 1338 * Mark unit and scale as not set 1339 * (different from default values, see below) 1340 */ 1341 info->unit = NULL; 1342 info->scale = 0.0; 1343 info->snapshot = false; 1344 1345 list_for_each_entry_safe(term, h, head_terms, list) { 1346 alias = pmu_find_alias(pmu, term); 1347 if (!alias) 1348 continue; 1349 ret = pmu_alias_terms(alias, &term->list); 1350 if (ret) 1351 return ret; 1352 1353 ret = check_info_data(alias, info); 1354 if (ret) 1355 return ret; 1356 1357 if (alias->per_pkg) 1358 info->per_pkg = true; 1359 1360 list_del_init(&term->list); 1361 parse_events_term__delete(term); 1362 } 1363 1364 /* 1365 * if no unit or scale found in aliases, then 1366 * set defaults as for evsel 1367 * unit cannot left to NULL 1368 */ 1369 if (info->unit == NULL) 1370 info->unit = ""; 1371 1372 if (info->scale == 0.0) 1373 info->scale = 1.0; 1374 1375 return 0; 1376 } 1377 1378 int perf_pmu__new_format(struct list_head *list, char *name, 1379 int config, unsigned long *bits) 1380 { 1381 struct perf_pmu_format *format; 1382 1383 format = zalloc(sizeof(*format)); 1384 if (!format) 1385 return -ENOMEM; 1386 1387 format->name = strdup(name); 1388 format->value = config; 1389 memcpy(format->bits, bits, sizeof(format->bits)); 1390 1391 list_add_tail(&format->list, list); 1392 return 0; 1393 } 1394 1395 void perf_pmu__set_format(unsigned long *bits, long from, long to) 1396 { 1397 long b; 1398 1399 if (!to) 1400 to = from; 1401 1402 memset(bits, 0, BITS_TO_BYTES(PERF_PMU_FORMAT_BITS)); 1403 for (b = from; b <= to; b++) 1404 __set_bit(b, bits); 1405 } 1406 1407 void perf_pmu__del_formats(struct list_head *formats) 1408 { 1409 struct perf_pmu_format *fmt, *tmp; 1410 1411 list_for_each_entry_safe(fmt, tmp, formats, list) { 1412 list_del(&fmt->list); 1413 zfree(&fmt->name); 1414 free(fmt); 1415 } 1416 } 1417 1418 bool is_pmu_core(const char *name) 1419 { 1420 return !strcmp(name, "cpu") || !strcmp(name, "cpum_cf") || is_sysfs_pmu_core(name); 1421 } 1422 1423 bool perf_pmu__supports_legacy_cache(const struct perf_pmu *pmu) 1424 { 1425 return pmu->is_core; 1426 } 1427 1428 bool perf_pmu__auto_merge_stats(const struct perf_pmu *pmu) 1429 { 1430 return pmu->is_core && perf_pmus__num_core_pmus() == 1; 1431 } 1432 1433 bool perf_pmu__have_event(const struct perf_pmu *pmu, const char *name) 1434 { 1435 struct perf_pmu_alias *alias; 1436 1437 list_for_each_entry(alias, &pmu->aliases, list) { 1438 if (!strcmp(alias->name, name)) 1439 return true; 1440 } 1441 return false; 1442 } 1443 1444 bool perf_pmu__is_software(const struct perf_pmu *pmu) 1445 { 1446 if (pmu->is_core || pmu->is_uncore || pmu->auxtrace) 1447 return false; 1448 switch (pmu->type) { 1449 case PERF_TYPE_HARDWARE: return false; 1450 case PERF_TYPE_SOFTWARE: return true; 1451 case PERF_TYPE_TRACEPOINT: return true; 1452 case PERF_TYPE_HW_CACHE: return false; 1453 case PERF_TYPE_RAW: return false; 1454 case PERF_TYPE_BREAKPOINT: return true; 1455 default: break; 1456 } 1457 return !strcmp(pmu->name, "kprobe") || !strcmp(pmu->name, "uprobe"); 1458 } 1459 1460 FILE *perf_pmu__open_file(struct perf_pmu *pmu, const char *name) 1461 { 1462 char path[PATH_MAX]; 1463 1464 if (!perf_pmu__pathname_scnprintf(path, sizeof(path), pmu->name, name) || 1465 !file_available(path)) 1466 return NULL; 1467 1468 return fopen(path, "r"); 1469 } 1470 1471 FILE *perf_pmu__open_file_at(struct perf_pmu *pmu, int dirfd, const char *name) 1472 { 1473 int fd; 1474 1475 fd = perf_pmu__pathname_fd(dirfd, pmu->name, name, O_RDONLY); 1476 if (fd < 0) 1477 return NULL; 1478 1479 return fdopen(fd, "r"); 1480 } 1481 1482 int perf_pmu__scan_file(struct perf_pmu *pmu, const char *name, const char *fmt, 1483 ...) 1484 { 1485 va_list args; 1486 FILE *file; 1487 int ret = EOF; 1488 1489 va_start(args, fmt); 1490 file = perf_pmu__open_file(pmu, name); 1491 if (file) { 1492 ret = vfscanf(file, fmt, args); 1493 fclose(file); 1494 } 1495 va_end(args); 1496 return ret; 1497 } 1498 1499 int perf_pmu__scan_file_at(struct perf_pmu *pmu, int dirfd, const char *name, 1500 const char *fmt, ...) 1501 { 1502 va_list args; 1503 FILE *file; 1504 int ret = EOF; 1505 1506 va_start(args, fmt); 1507 file = perf_pmu__open_file_at(pmu, dirfd, name); 1508 if (file) { 1509 ret = vfscanf(file, fmt, args); 1510 fclose(file); 1511 } 1512 va_end(args); 1513 return ret; 1514 } 1515 1516 bool perf_pmu__file_exists(struct perf_pmu *pmu, const char *name) 1517 { 1518 char path[PATH_MAX]; 1519 1520 if (!perf_pmu__pathname_scnprintf(path, sizeof(path), pmu->name, name)) 1521 return false; 1522 1523 return file_available(path); 1524 } 1525 1526 static int perf_pmu__new_caps(struct list_head *list, char *name, char *value) 1527 { 1528 struct perf_pmu_caps *caps = zalloc(sizeof(*caps)); 1529 1530 if (!caps) 1531 return -ENOMEM; 1532 1533 caps->name = strdup(name); 1534 if (!caps->name) 1535 goto free_caps; 1536 caps->value = strndup(value, strlen(value) - 1); 1537 if (!caps->value) 1538 goto free_name; 1539 list_add_tail(&caps->list, list); 1540 return 0; 1541 1542 free_name: 1543 zfree(&caps->name); 1544 free_caps: 1545 free(caps); 1546 1547 return -ENOMEM; 1548 } 1549 1550 static void perf_pmu__del_caps(struct perf_pmu *pmu) 1551 { 1552 struct perf_pmu_caps *caps, *tmp; 1553 1554 list_for_each_entry_safe(caps, tmp, &pmu->caps, list) { 1555 list_del(&caps->list); 1556 zfree(&caps->name); 1557 zfree(&caps->value); 1558 free(caps); 1559 } 1560 } 1561 1562 /* 1563 * Reading/parsing the given pmu capabilities, which should be located at: 1564 * /sys/bus/event_source/devices/<dev>/caps as sysfs group attributes. 1565 * Return the number of capabilities 1566 */ 1567 int perf_pmu__caps_parse(struct perf_pmu *pmu) 1568 { 1569 struct stat st; 1570 char caps_path[PATH_MAX]; 1571 DIR *caps_dir; 1572 struct dirent *evt_ent; 1573 int caps_fd; 1574 1575 if (pmu->caps_initialized) 1576 return pmu->nr_caps; 1577 1578 pmu->nr_caps = 0; 1579 1580 if (!perf_pmu__pathname_scnprintf(caps_path, sizeof(caps_path), pmu->name, "caps")) 1581 return -1; 1582 1583 if (stat(caps_path, &st) < 0) { 1584 pmu->caps_initialized = true; 1585 return 0; /* no error if caps does not exist */ 1586 } 1587 1588 caps_dir = opendir(caps_path); 1589 if (!caps_dir) 1590 return -EINVAL; 1591 1592 caps_fd = dirfd(caps_dir); 1593 1594 while ((evt_ent = readdir(caps_dir)) != NULL) { 1595 char *name = evt_ent->d_name; 1596 char value[128]; 1597 FILE *file; 1598 int fd; 1599 1600 if (!strcmp(name, ".") || !strcmp(name, "..")) 1601 continue; 1602 1603 fd = openat(caps_fd, name, O_RDONLY); 1604 if (fd == -1) 1605 continue; 1606 file = fdopen(fd, "r"); 1607 if (!file) { 1608 close(fd); 1609 continue; 1610 } 1611 1612 if (!fgets(value, sizeof(value), file) || 1613 (perf_pmu__new_caps(&pmu->caps, name, value) < 0)) { 1614 fclose(file); 1615 continue; 1616 } 1617 1618 pmu->nr_caps++; 1619 fclose(file); 1620 } 1621 1622 closedir(caps_dir); 1623 1624 pmu->caps_initialized = true; 1625 return pmu->nr_caps; 1626 } 1627 1628 static void perf_pmu__compute_config_masks(struct perf_pmu *pmu) 1629 { 1630 struct perf_pmu_format *format; 1631 1632 if (pmu->config_masks_computed) 1633 return; 1634 1635 list_for_each_entry(format, &pmu->format, list) { 1636 unsigned int i; 1637 __u64 *mask; 1638 1639 if (format->value >= PERF_PMU_FORMAT_VALUE_CONFIG_END) 1640 continue; 1641 1642 pmu->config_masks_present = true; 1643 mask = &pmu->config_masks[format->value]; 1644 1645 for_each_set_bit(i, format->bits, PERF_PMU_FORMAT_BITS) 1646 *mask |= 1ULL << i; 1647 } 1648 pmu->config_masks_computed = true; 1649 } 1650 1651 void perf_pmu__warn_invalid_config(struct perf_pmu *pmu, __u64 config, 1652 const char *name, int config_num, 1653 const char *config_name) 1654 { 1655 __u64 bits; 1656 char buf[100]; 1657 1658 perf_pmu__compute_config_masks(pmu); 1659 1660 /* 1661 * Kernel doesn't export any valid format bits. 1662 */ 1663 if (!pmu->config_masks_present) 1664 return; 1665 1666 bits = config & ~pmu->config_masks[config_num]; 1667 if (bits == 0) 1668 return; 1669 1670 bitmap_scnprintf((unsigned long *)&bits, sizeof(bits) * 8, buf, sizeof(buf)); 1671 1672 pr_warning("WARNING: event '%s' not valid (bits %s of %s " 1673 "'%llx' not supported by kernel)!\n", 1674 name ?: "N/A", buf, config_name, config); 1675 } 1676 1677 int perf_pmu__match(char *pattern, char *name, char *tok) 1678 { 1679 if (!name) 1680 return -1; 1681 1682 if (fnmatch(pattern, name, 0)) 1683 return -1; 1684 1685 if (tok && !perf_pmu__match_ignoring_suffix(name, tok)) 1686 return -1; 1687 1688 return 0; 1689 } 1690 1691 double __weak perf_pmu__cpu_slots_per_cycle(void) 1692 { 1693 return NAN; 1694 } 1695 1696 int perf_pmu__event_source_devices_scnprintf(char *pathname, size_t size) 1697 { 1698 const char *sysfs = sysfs__mountpoint(); 1699 1700 if (!sysfs) 1701 return 0; 1702 return scnprintf(pathname, size, "%s/bus/event_source/devices/", sysfs); 1703 } 1704 1705 int perf_pmu__event_source_devices_fd(void) 1706 { 1707 char path[PATH_MAX]; 1708 const char *sysfs = sysfs__mountpoint(); 1709 1710 if (!sysfs) 1711 return -1; 1712 1713 scnprintf(path, sizeof(path), "%s/bus/event_source/devices/", sysfs); 1714 return open(path, O_DIRECTORY); 1715 } 1716 1717 /* 1718 * Fill 'buf' with the path to a file or folder in 'pmu_name' in 1719 * sysfs. For example if pmu_name = "cs_etm" and 'filename' = "format" 1720 * then pathname will be filled with 1721 * "/sys/bus/event_source/devices/cs_etm/format" 1722 * 1723 * Return 0 if the sysfs mountpoint couldn't be found or if no 1724 * characters were written. 1725 */ 1726 int perf_pmu__pathname_scnprintf(char *buf, size_t size, 1727 const char *pmu_name, const char *filename) 1728 { 1729 char base_path[PATH_MAX]; 1730 1731 if (!perf_pmu__event_source_devices_scnprintf(base_path, sizeof(base_path))) 1732 return 0; 1733 return scnprintf(buf, size, "%s%s/%s", base_path, pmu_name, filename); 1734 } 1735 1736 int perf_pmu__pathname_fd(int dirfd, const char *pmu_name, const char *filename, int flags) 1737 { 1738 char path[PATH_MAX]; 1739 1740 scnprintf(path, sizeof(path), "%s/%s", pmu_name, filename); 1741 return openat(dirfd, path, flags); 1742 } 1743 1744 void perf_pmu__delete(struct perf_pmu *pmu) 1745 { 1746 perf_pmu__del_formats(&pmu->format); 1747 perf_pmu__del_aliases(pmu); 1748 perf_pmu__del_caps(pmu); 1749 1750 perf_cpu_map__put(pmu->cpus); 1751 1752 zfree(&pmu->default_config); 1753 zfree(&pmu->name); 1754 zfree(&pmu->alias_name); 1755 free(pmu); 1756 } 1757