1 // SPDX-License-Identifier: GPL-2.0 2 #include <api/fs/fs.h> 3 #include "../perf.h" 4 #include "cpumap.h" 5 #include <assert.h> 6 #include <dirent.h> 7 #include <stdio.h> 8 #include <stdlib.h> 9 #include <linux/bitmap.h> 10 #include "asm/bug.h" 11 12 #include <linux/ctype.h> 13 #include <linux/zalloc.h> 14 15 static int max_cpu_num; 16 static int max_present_cpu_num; 17 static int max_node_num; 18 static int *cpunode_map; 19 20 static struct cpu_map *cpu_map__default_new(void) 21 { 22 struct cpu_map *cpus; 23 int nr_cpus; 24 25 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); 26 if (nr_cpus < 0) 27 return NULL; 28 29 cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int)); 30 if (cpus != NULL) { 31 int i; 32 for (i = 0; i < nr_cpus; ++i) 33 cpus->map[i] = i; 34 35 cpus->nr = nr_cpus; 36 refcount_set(&cpus->refcnt, 1); 37 } 38 39 return cpus; 40 } 41 42 static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus) 43 { 44 size_t payload_size = nr_cpus * sizeof(int); 45 struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size); 46 47 if (cpus != NULL) { 48 cpus->nr = nr_cpus; 49 memcpy(cpus->map, tmp_cpus, payload_size); 50 refcount_set(&cpus->refcnt, 1); 51 } 52 53 return cpus; 54 } 55 56 struct cpu_map *cpu_map__read(FILE *file) 57 { 58 struct cpu_map *cpus = NULL; 59 int nr_cpus = 0; 60 int *tmp_cpus = NULL, *tmp; 61 int max_entries = 0; 62 int n, cpu, prev; 63 char sep; 64 65 sep = 0; 66 prev = -1; 67 for (;;) { 68 n = fscanf(file, "%u%c", &cpu, &sep); 69 if (n <= 0) 70 break; 71 if (prev >= 0) { 72 int new_max = nr_cpus + cpu - prev - 1; 73 74 if (new_max >= max_entries) { 75 max_entries = new_max + MAX_NR_CPUS / 2; 76 tmp = realloc(tmp_cpus, max_entries * sizeof(int)); 77 if (tmp == NULL) 78 goto out_free_tmp; 79 tmp_cpus = tmp; 80 } 81 82 while (++prev < cpu) 83 tmp_cpus[nr_cpus++] = prev; 84 } 85 if (nr_cpus == max_entries) { 86 max_entries += MAX_NR_CPUS; 87 tmp = realloc(tmp_cpus, max_entries * sizeof(int)); 88 if (tmp == NULL) 89 goto out_free_tmp; 90 tmp_cpus = tmp; 91 } 92 93 tmp_cpus[nr_cpus++] = cpu; 94 if (n == 2 && sep == '-') 95 prev = cpu; 96 else 97 prev = -1; 98 if (n == 1 || sep == '\n') 99 break; 100 } 101 102 if (nr_cpus > 0) 103 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus); 104 else 105 cpus = cpu_map__default_new(); 106 out_free_tmp: 107 free(tmp_cpus); 108 return cpus; 109 } 110 111 static struct cpu_map *cpu_map__read_all_cpu_map(void) 112 { 113 struct cpu_map *cpus = NULL; 114 FILE *onlnf; 115 116 onlnf = fopen("/sys/devices/system/cpu/online", "r"); 117 if (!onlnf) 118 return cpu_map__default_new(); 119 120 cpus = cpu_map__read(onlnf); 121 fclose(onlnf); 122 return cpus; 123 } 124 125 struct cpu_map *cpu_map__new(const char *cpu_list) 126 { 127 struct cpu_map *cpus = NULL; 128 unsigned long start_cpu, end_cpu = 0; 129 char *p = NULL; 130 int i, nr_cpus = 0; 131 int *tmp_cpus = NULL, *tmp; 132 int max_entries = 0; 133 134 if (!cpu_list) 135 return cpu_map__read_all_cpu_map(); 136 137 /* 138 * must handle the case of empty cpumap to cover 139 * TOPOLOGY header for NUMA nodes with no CPU 140 * ( e.g., because of CPU hotplug) 141 */ 142 if (!isdigit(*cpu_list) && *cpu_list != '\0') 143 goto out; 144 145 while (isdigit(*cpu_list)) { 146 p = NULL; 147 start_cpu = strtoul(cpu_list, &p, 0); 148 if (start_cpu >= INT_MAX 149 || (*p != '\0' && *p != ',' && *p != '-')) 150 goto invalid; 151 152 if (*p == '-') { 153 cpu_list = ++p; 154 p = NULL; 155 end_cpu = strtoul(cpu_list, &p, 0); 156 157 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ',')) 158 goto invalid; 159 160 if (end_cpu < start_cpu) 161 goto invalid; 162 } else { 163 end_cpu = start_cpu; 164 } 165 166 for (; start_cpu <= end_cpu; start_cpu++) { 167 /* check for duplicates */ 168 for (i = 0; i < nr_cpus; i++) 169 if (tmp_cpus[i] == (int)start_cpu) 170 goto invalid; 171 172 if (nr_cpus == max_entries) { 173 max_entries += MAX_NR_CPUS; 174 tmp = realloc(tmp_cpus, max_entries * sizeof(int)); 175 if (tmp == NULL) 176 goto invalid; 177 tmp_cpus = tmp; 178 } 179 tmp_cpus[nr_cpus++] = (int)start_cpu; 180 } 181 if (*p) 182 ++p; 183 184 cpu_list = p; 185 } 186 187 if (nr_cpus > 0) 188 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus); 189 else if (*cpu_list != '\0') 190 cpus = cpu_map__default_new(); 191 else 192 cpus = cpu_map__dummy_new(); 193 invalid: 194 free(tmp_cpus); 195 out: 196 return cpus; 197 } 198 199 static struct cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus) 200 { 201 struct cpu_map *map; 202 203 map = cpu_map__empty_new(cpus->nr); 204 if (map) { 205 unsigned i; 206 207 for (i = 0; i < cpus->nr; i++) { 208 /* 209 * Special treatment for -1, which is not real cpu number, 210 * and we need to use (int) -1 to initialize map[i], 211 * otherwise it would become 65535. 212 */ 213 if (cpus->cpu[i] == (u16) -1) 214 map->map[i] = -1; 215 else 216 map->map[i] = (int) cpus->cpu[i]; 217 } 218 } 219 220 return map; 221 } 222 223 static struct cpu_map *cpu_map__from_mask(struct cpu_map_mask *mask) 224 { 225 struct cpu_map *map; 226 int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE; 227 228 nr = bitmap_weight(mask->mask, nbits); 229 230 map = cpu_map__empty_new(nr); 231 if (map) { 232 int cpu, i = 0; 233 234 for_each_set_bit(cpu, mask->mask, nbits) 235 map->map[i++] = cpu; 236 } 237 return map; 238 239 } 240 241 struct cpu_map *cpu_map__new_data(struct cpu_map_data *data) 242 { 243 if (data->type == PERF_CPU_MAP__CPUS) 244 return cpu_map__from_entries((struct cpu_map_entries *)data->data); 245 else 246 return cpu_map__from_mask((struct cpu_map_mask *)data->data); 247 } 248 249 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp) 250 { 251 #define BUFSIZE 1024 252 char buf[BUFSIZE]; 253 254 cpu_map__snprint(map, buf, sizeof(buf)); 255 return fprintf(fp, "%s\n", buf); 256 #undef BUFSIZE 257 } 258 259 struct cpu_map *cpu_map__dummy_new(void) 260 { 261 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int)); 262 263 if (cpus != NULL) { 264 cpus->nr = 1; 265 cpus->map[0] = -1; 266 refcount_set(&cpus->refcnt, 1); 267 } 268 269 return cpus; 270 } 271 272 struct cpu_map *cpu_map__empty_new(int nr) 273 { 274 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr); 275 276 if (cpus != NULL) { 277 int i; 278 279 cpus->nr = nr; 280 for (i = 0; i < nr; i++) 281 cpus->map[i] = -1; 282 283 refcount_set(&cpus->refcnt, 1); 284 } 285 286 return cpus; 287 } 288 289 static void cpu_map__delete(struct cpu_map *map) 290 { 291 if (map) { 292 WARN_ONCE(refcount_read(&map->refcnt) != 0, 293 "cpu_map refcnt unbalanced\n"); 294 free(map); 295 } 296 } 297 298 struct cpu_map *cpu_map__get(struct cpu_map *map) 299 { 300 if (map) 301 refcount_inc(&map->refcnt); 302 return map; 303 } 304 305 void cpu_map__put(struct cpu_map *map) 306 { 307 if (map && refcount_dec_and_test(&map->refcnt)) 308 cpu_map__delete(map); 309 } 310 311 static int cpu__get_topology_int(int cpu, const char *name, int *value) 312 { 313 char path[PATH_MAX]; 314 315 snprintf(path, PATH_MAX, 316 "devices/system/cpu/cpu%d/topology/%s", cpu, name); 317 318 return sysfs__read_int(path, value); 319 } 320 321 int cpu_map__get_socket_id(int cpu) 322 { 323 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value); 324 return ret ?: value; 325 } 326 327 int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused) 328 { 329 int cpu; 330 331 if (idx > map->nr) 332 return -1; 333 334 cpu = map->map[idx]; 335 336 return cpu_map__get_socket_id(cpu); 337 } 338 339 static int cmp_ids(const void *a, const void *b) 340 { 341 return *(int *)a - *(int *)b; 342 } 343 344 int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res, 345 int (*f)(struct cpu_map *map, int cpu, void *data), 346 void *data) 347 { 348 struct cpu_map *c; 349 int nr = cpus->nr; 350 int cpu, s1, s2; 351 352 /* allocate as much as possible */ 353 c = calloc(1, sizeof(*c) + nr * sizeof(int)); 354 if (!c) 355 return -1; 356 357 for (cpu = 0; cpu < nr; cpu++) { 358 s1 = f(cpus, cpu, data); 359 for (s2 = 0; s2 < c->nr; s2++) { 360 if (s1 == c->map[s2]) 361 break; 362 } 363 if (s2 == c->nr) { 364 c->map[c->nr] = s1; 365 c->nr++; 366 } 367 } 368 /* ensure we process id in increasing order */ 369 qsort(c->map, c->nr, sizeof(int), cmp_ids); 370 371 refcount_set(&c->refcnt, 1); 372 *res = c; 373 return 0; 374 } 375 376 int cpu_map__get_die_id(int cpu) 377 { 378 int value, ret = cpu__get_topology_int(cpu, "die_id", &value); 379 380 return ret ?: value; 381 } 382 383 int cpu_map__get_die(struct cpu_map *map, int idx, void *data) 384 { 385 int cpu, die_id, s; 386 387 if (idx > map->nr) 388 return -1; 389 390 cpu = map->map[idx]; 391 392 die_id = cpu_map__get_die_id(cpu); 393 /* There is no die_id on legacy system. */ 394 if (die_id == -1) 395 die_id = 0; 396 397 s = cpu_map__get_socket(map, idx, data); 398 if (s == -1) 399 return -1; 400 401 /* 402 * Encode socket in bit range 15:8 403 * die_id is relative to socket, and 404 * we need a global id. So we combine 405 * socket + die id 406 */ 407 if (WARN_ONCE(die_id >> 8, "The die id number is too big.\n")) 408 return -1; 409 410 if (WARN_ONCE(s >> 8, "The socket id number is too big.\n")) 411 return -1; 412 413 return (s << 8) | (die_id & 0xff); 414 } 415 416 int cpu_map__get_core_id(int cpu) 417 { 418 int value, ret = cpu__get_topology_int(cpu, "core_id", &value); 419 return ret ?: value; 420 } 421 422 int cpu_map__get_core(struct cpu_map *map, int idx, void *data) 423 { 424 int cpu, s_die; 425 426 if (idx > map->nr) 427 return -1; 428 429 cpu = map->map[idx]; 430 431 cpu = cpu_map__get_core_id(cpu); 432 433 /* s_die is the combination of socket + die id */ 434 s_die = cpu_map__get_die(map, idx, data); 435 if (s_die == -1) 436 return -1; 437 438 /* 439 * encode socket in bit range 31:24 440 * encode die id in bit range 23:16 441 * core_id is relative to socket and die, 442 * we need a global id. So we combine 443 * socket + die id + core id 444 */ 445 if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n")) 446 return -1; 447 448 return (s_die << 16) | (cpu & 0xffff); 449 } 450 451 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp) 452 { 453 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL); 454 } 455 456 int cpu_map__build_die_map(struct cpu_map *cpus, struct cpu_map **diep) 457 { 458 return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL); 459 } 460 461 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep) 462 { 463 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL); 464 } 465 466 /* setup simple routines to easily access node numbers given a cpu number */ 467 static int get_max_num(char *path, int *max) 468 { 469 size_t num; 470 char *buf; 471 int err = 0; 472 473 if (filename__read_str(path, &buf, &num)) 474 return -1; 475 476 buf[num] = '\0'; 477 478 /* start on the right, to find highest node num */ 479 while (--num) { 480 if ((buf[num] == ',') || (buf[num] == '-')) { 481 num++; 482 break; 483 } 484 } 485 if (sscanf(&buf[num], "%d", max) < 1) { 486 err = -1; 487 goto out; 488 } 489 490 /* convert from 0-based to 1-based */ 491 (*max)++; 492 493 out: 494 free(buf); 495 return err; 496 } 497 498 /* Determine highest possible cpu in the system for sparse allocation */ 499 static void set_max_cpu_num(void) 500 { 501 const char *mnt; 502 char path[PATH_MAX]; 503 int ret = -1; 504 505 /* set up default */ 506 max_cpu_num = 4096; 507 max_present_cpu_num = 4096; 508 509 mnt = sysfs__mountpoint(); 510 if (!mnt) 511 goto out; 512 513 /* get the highest possible cpu number for a sparse allocation */ 514 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt); 515 if (ret == PATH_MAX) { 516 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 517 goto out; 518 } 519 520 ret = get_max_num(path, &max_cpu_num); 521 if (ret) 522 goto out; 523 524 /* get the highest present cpu number for a sparse allocation */ 525 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt); 526 if (ret == PATH_MAX) { 527 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 528 goto out; 529 } 530 531 ret = get_max_num(path, &max_present_cpu_num); 532 533 out: 534 if (ret) 535 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num); 536 } 537 538 /* Determine highest possible node in the system for sparse allocation */ 539 static void set_max_node_num(void) 540 { 541 const char *mnt; 542 char path[PATH_MAX]; 543 int ret = -1; 544 545 /* set up default */ 546 max_node_num = 8; 547 548 mnt = sysfs__mountpoint(); 549 if (!mnt) 550 goto out; 551 552 /* get the highest possible cpu number for a sparse allocation */ 553 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt); 554 if (ret == PATH_MAX) { 555 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 556 goto out; 557 } 558 559 ret = get_max_num(path, &max_node_num); 560 561 out: 562 if (ret) 563 pr_err("Failed to read max nodes, using default of %d\n", max_node_num); 564 } 565 566 int cpu__max_node(void) 567 { 568 if (unlikely(!max_node_num)) 569 set_max_node_num(); 570 571 return max_node_num; 572 } 573 574 int cpu__max_cpu(void) 575 { 576 if (unlikely(!max_cpu_num)) 577 set_max_cpu_num(); 578 579 return max_cpu_num; 580 } 581 582 int cpu__max_present_cpu(void) 583 { 584 if (unlikely(!max_present_cpu_num)) 585 set_max_cpu_num(); 586 587 return max_present_cpu_num; 588 } 589 590 591 int cpu__get_node(int cpu) 592 { 593 if (unlikely(cpunode_map == NULL)) { 594 pr_debug("cpu_map not initialized\n"); 595 return -1; 596 } 597 598 return cpunode_map[cpu]; 599 } 600 601 static int init_cpunode_map(void) 602 { 603 int i; 604 605 set_max_cpu_num(); 606 set_max_node_num(); 607 608 cpunode_map = calloc(max_cpu_num, sizeof(int)); 609 if (!cpunode_map) { 610 pr_err("%s: calloc failed\n", __func__); 611 return -1; 612 } 613 614 for (i = 0; i < max_cpu_num; i++) 615 cpunode_map[i] = -1; 616 617 return 0; 618 } 619 620 int cpu__setup_cpunode_map(void) 621 { 622 struct dirent *dent1, *dent2; 623 DIR *dir1, *dir2; 624 unsigned int cpu, mem; 625 char buf[PATH_MAX]; 626 char path[PATH_MAX]; 627 const char *mnt; 628 int n; 629 630 /* initialize globals */ 631 if (init_cpunode_map()) 632 return -1; 633 634 mnt = sysfs__mountpoint(); 635 if (!mnt) 636 return 0; 637 638 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt); 639 if (n == PATH_MAX) { 640 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 641 return -1; 642 } 643 644 dir1 = opendir(path); 645 if (!dir1) 646 return 0; 647 648 /* walk tree and setup map */ 649 while ((dent1 = readdir(dir1)) != NULL) { 650 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1) 651 continue; 652 653 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name); 654 if (n == PATH_MAX) { 655 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 656 continue; 657 } 658 659 dir2 = opendir(buf); 660 if (!dir2) 661 continue; 662 while ((dent2 = readdir(dir2)) != NULL) { 663 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1) 664 continue; 665 cpunode_map[cpu] = mem; 666 } 667 closedir(dir2); 668 } 669 closedir(dir1); 670 return 0; 671 } 672 673 bool cpu_map__has(struct cpu_map *cpus, int cpu) 674 { 675 return cpu_map__idx(cpus, cpu) != -1; 676 } 677 678 int cpu_map__idx(struct cpu_map *cpus, int cpu) 679 { 680 int i; 681 682 for (i = 0; i < cpus->nr; ++i) { 683 if (cpus->map[i] == cpu) 684 return i; 685 } 686 687 return -1; 688 } 689 690 int cpu_map__cpu(struct cpu_map *cpus, int idx) 691 { 692 return cpus->map[idx]; 693 } 694 695 size_t cpu_map__snprint(struct cpu_map *map, char *buf, size_t size) 696 { 697 int i, cpu, start = -1; 698 bool first = true; 699 size_t ret = 0; 700 701 #define COMMA first ? "" : "," 702 703 for (i = 0; i < map->nr + 1; i++) { 704 bool last = i == map->nr; 705 706 cpu = last ? INT_MAX : map->map[i]; 707 708 if (start == -1) { 709 start = i; 710 if (last) { 711 ret += snprintf(buf + ret, size - ret, 712 "%s%d", COMMA, 713 map->map[i]); 714 } 715 } else if (((i - start) != (cpu - map->map[start])) || last) { 716 int end = i - 1; 717 718 if (start == end) { 719 ret += snprintf(buf + ret, size - ret, 720 "%s%d", COMMA, 721 map->map[start]); 722 } else { 723 ret += snprintf(buf + ret, size - ret, 724 "%s%d-%d", COMMA, 725 map->map[start], map->map[end]); 726 } 727 first = false; 728 start = i; 729 } 730 } 731 732 #undef COMMA 733 734 pr_debug2("cpumask list: %s\n", buf); 735 return ret; 736 } 737 738 static char hex_char(unsigned char val) 739 { 740 if (val < 10) 741 return val + '0'; 742 if (val < 16) 743 return val - 10 + 'a'; 744 return '?'; 745 } 746 747 size_t cpu_map__snprint_mask(struct cpu_map *map, char *buf, size_t size) 748 { 749 int i, cpu; 750 char *ptr = buf; 751 unsigned char *bitmap; 752 int last_cpu = cpu_map__cpu(map, map->nr - 1); 753 754 bitmap = zalloc((last_cpu + 7) / 8); 755 if (bitmap == NULL) { 756 buf[0] = '\0'; 757 return 0; 758 } 759 760 for (i = 0; i < map->nr; i++) { 761 cpu = cpu_map__cpu(map, i); 762 bitmap[cpu / 8] |= 1 << (cpu % 8); 763 } 764 765 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) { 766 unsigned char bits = bitmap[cpu / 8]; 767 768 if (cpu % 8) 769 bits >>= 4; 770 else 771 bits &= 0xf; 772 773 *ptr++ = hex_char(bits); 774 if ((cpu % 32) == 0 && cpu > 0) 775 *ptr++ = ','; 776 } 777 *ptr = '\0'; 778 free(bitmap); 779 780 buf[size - 1] = '\0'; 781 return ptr - buf; 782 } 783 784 const struct cpu_map *cpu_map__online(void) /* thread unsafe */ 785 { 786 static const struct cpu_map *online = NULL; 787 788 if (!online) 789 online = cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */ 790 791 return online; 792 } 793