1 // SPDX-License-Identifier: GPL-2.0 2 #include <api/fs/fs.h> 3 #include "cpumap.h" 4 #include "debug.h" 5 #include "event.h" 6 #include <assert.h> 7 #include <dirent.h> 8 #include <stdio.h> 9 #include <stdlib.h> 10 #include <linux/bitmap.h> 11 #include "asm/bug.h" 12 13 #include <linux/ctype.h> 14 #include <linux/zalloc.h> 15 16 static int max_cpu_num; 17 static int max_present_cpu_num; 18 static int max_node_num; 19 static int *cpunode_map; 20 21 static struct perf_cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus) 22 { 23 struct perf_cpu_map *map; 24 25 map = perf_cpu_map__empty_new(cpus->nr); 26 if (map) { 27 unsigned i; 28 29 for (i = 0; i < cpus->nr; i++) { 30 /* 31 * Special treatment for -1, which is not real cpu number, 32 * and we need to use (int) -1 to initialize map[i], 33 * otherwise it would become 65535. 34 */ 35 if (cpus->cpu[i] == (u16) -1) 36 map->map[i] = -1; 37 else 38 map->map[i] = (int) cpus->cpu[i]; 39 } 40 } 41 42 return map; 43 } 44 45 static struct perf_cpu_map *cpu_map__from_mask(struct perf_record_record_cpu_map *mask) 46 { 47 struct perf_cpu_map *map; 48 int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE; 49 50 nr = bitmap_weight(mask->mask, nbits); 51 52 map = perf_cpu_map__empty_new(nr); 53 if (map) { 54 int cpu, i = 0; 55 56 for_each_set_bit(cpu, mask->mask, nbits) 57 map->map[i++] = cpu; 58 } 59 return map; 60 61 } 62 63 struct perf_cpu_map *cpu_map__new_data(struct perf_record_cpu_map_data *data) 64 { 65 if (data->type == PERF_CPU_MAP__CPUS) 66 return cpu_map__from_entries((struct cpu_map_entries *)data->data); 67 else 68 return cpu_map__from_mask((struct perf_record_record_cpu_map *)data->data); 69 } 70 71 size_t cpu_map__fprintf(struct perf_cpu_map *map, FILE *fp) 72 { 73 #define BUFSIZE 1024 74 char buf[BUFSIZE]; 75 76 cpu_map__snprint(map, buf, sizeof(buf)); 77 return fprintf(fp, "%s\n", buf); 78 #undef BUFSIZE 79 } 80 81 struct perf_cpu_map *perf_cpu_map__empty_new(int nr) 82 { 83 struct perf_cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr); 84 85 if (cpus != NULL) { 86 int i; 87 88 cpus->nr = nr; 89 for (i = 0; i < nr; i++) 90 cpus->map[i] = -1; 91 92 refcount_set(&cpus->refcnt, 1); 93 } 94 95 return cpus; 96 } 97 98 static int cpu__get_topology_int(int cpu, const char *name, int *value) 99 { 100 char path[PATH_MAX]; 101 102 snprintf(path, PATH_MAX, 103 "devices/system/cpu/cpu%d/topology/%s", cpu, name); 104 105 return sysfs__read_int(path, value); 106 } 107 108 int cpu_map__get_socket_id(int cpu) 109 { 110 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value); 111 return ret ?: value; 112 } 113 114 int cpu_map__get_socket(struct perf_cpu_map *map, int idx, void *data __maybe_unused) 115 { 116 int cpu; 117 118 if (idx > map->nr) 119 return -1; 120 121 cpu = map->map[idx]; 122 123 return cpu_map__get_socket_id(cpu); 124 } 125 126 static int cmp_ids(const void *a, const void *b) 127 { 128 return *(int *)a - *(int *)b; 129 } 130 131 int cpu_map__build_map(struct perf_cpu_map *cpus, struct perf_cpu_map **res, 132 int (*f)(struct perf_cpu_map *map, int cpu, void *data), 133 void *data) 134 { 135 struct perf_cpu_map *c; 136 int nr = cpus->nr; 137 int cpu, s1, s2; 138 139 /* allocate as much as possible */ 140 c = calloc(1, sizeof(*c) + nr * sizeof(int)); 141 if (!c) 142 return -1; 143 144 for (cpu = 0; cpu < nr; cpu++) { 145 s1 = f(cpus, cpu, data); 146 for (s2 = 0; s2 < c->nr; s2++) { 147 if (s1 == c->map[s2]) 148 break; 149 } 150 if (s2 == c->nr) { 151 c->map[c->nr] = s1; 152 c->nr++; 153 } 154 } 155 /* ensure we process id in increasing order */ 156 qsort(c->map, c->nr, sizeof(int), cmp_ids); 157 158 refcount_set(&c->refcnt, 1); 159 *res = c; 160 return 0; 161 } 162 163 int cpu_map__get_die_id(int cpu) 164 { 165 int value, ret = cpu__get_topology_int(cpu, "die_id", &value); 166 167 return ret ?: value; 168 } 169 170 int cpu_map__get_die(struct perf_cpu_map *map, int idx, void *data) 171 { 172 int cpu, die_id, s; 173 174 if (idx > map->nr) 175 return -1; 176 177 cpu = map->map[idx]; 178 179 die_id = cpu_map__get_die_id(cpu); 180 /* There is no die_id on legacy system. */ 181 if (die_id == -1) 182 die_id = 0; 183 184 s = cpu_map__get_socket(map, idx, data); 185 if (s == -1) 186 return -1; 187 188 /* 189 * Encode socket in bit range 15:8 190 * die_id is relative to socket, and 191 * we need a global id. So we combine 192 * socket + die id 193 */ 194 if (WARN_ONCE(die_id >> 8, "The die id number is too big.\n")) 195 return -1; 196 197 if (WARN_ONCE(s >> 8, "The socket id number is too big.\n")) 198 return -1; 199 200 return (s << 8) | (die_id & 0xff); 201 } 202 203 int cpu_map__get_core_id(int cpu) 204 { 205 int value, ret = cpu__get_topology_int(cpu, "core_id", &value); 206 return ret ?: value; 207 } 208 209 int cpu_map__get_node_id(int cpu) 210 { 211 return cpu__get_node(cpu); 212 } 213 214 int cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data) 215 { 216 int cpu, s_die; 217 218 if (idx > map->nr) 219 return -1; 220 221 cpu = map->map[idx]; 222 223 cpu = cpu_map__get_core_id(cpu); 224 225 /* s_die is the combination of socket + die id */ 226 s_die = cpu_map__get_die(map, idx, data); 227 if (s_die == -1) 228 return -1; 229 230 /* 231 * encode socket in bit range 31:24 232 * encode die id in bit range 23:16 233 * core_id is relative to socket and die, 234 * we need a global id. So we combine 235 * socket + die id + core id 236 */ 237 if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n")) 238 return -1; 239 240 return (s_die << 16) | (cpu & 0xffff); 241 } 242 243 int cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data __maybe_unused) 244 { 245 if (idx < 0 || idx >= map->nr) 246 return -1; 247 248 return cpu_map__get_node_id(map->map[idx]); 249 } 250 251 int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct perf_cpu_map **sockp) 252 { 253 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL); 254 } 255 256 int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct perf_cpu_map **diep) 257 { 258 return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL); 259 } 260 261 int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct perf_cpu_map **corep) 262 { 263 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL); 264 } 265 266 int cpu_map__build_node_map(struct perf_cpu_map *cpus, struct perf_cpu_map **numap) 267 { 268 return cpu_map__build_map(cpus, numap, cpu_map__get_node, NULL); 269 } 270 271 /* setup simple routines to easily access node numbers given a cpu number */ 272 static int get_max_num(char *path, int *max) 273 { 274 size_t num; 275 char *buf; 276 int err = 0; 277 278 if (filename__read_str(path, &buf, &num)) 279 return -1; 280 281 buf[num] = '\0'; 282 283 /* start on the right, to find highest node num */ 284 while (--num) { 285 if ((buf[num] == ',') || (buf[num] == '-')) { 286 num++; 287 break; 288 } 289 } 290 if (sscanf(&buf[num], "%d", max) < 1) { 291 err = -1; 292 goto out; 293 } 294 295 /* convert from 0-based to 1-based */ 296 (*max)++; 297 298 out: 299 free(buf); 300 return err; 301 } 302 303 /* Determine highest possible cpu in the system for sparse allocation */ 304 static void set_max_cpu_num(void) 305 { 306 const char *mnt; 307 char path[PATH_MAX]; 308 int ret = -1; 309 310 /* set up default */ 311 max_cpu_num = 4096; 312 max_present_cpu_num = 4096; 313 314 mnt = sysfs__mountpoint(); 315 if (!mnt) 316 goto out; 317 318 /* get the highest possible cpu number for a sparse allocation */ 319 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt); 320 if (ret == PATH_MAX) { 321 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 322 goto out; 323 } 324 325 ret = get_max_num(path, &max_cpu_num); 326 if (ret) 327 goto out; 328 329 /* get the highest present cpu number for a sparse allocation */ 330 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt); 331 if (ret == PATH_MAX) { 332 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 333 goto out; 334 } 335 336 ret = get_max_num(path, &max_present_cpu_num); 337 338 out: 339 if (ret) 340 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num); 341 } 342 343 /* Determine highest possible node in the system for sparse allocation */ 344 static void set_max_node_num(void) 345 { 346 const char *mnt; 347 char path[PATH_MAX]; 348 int ret = -1; 349 350 /* set up default */ 351 max_node_num = 8; 352 353 mnt = sysfs__mountpoint(); 354 if (!mnt) 355 goto out; 356 357 /* get the highest possible cpu number for a sparse allocation */ 358 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt); 359 if (ret == PATH_MAX) { 360 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 361 goto out; 362 } 363 364 ret = get_max_num(path, &max_node_num); 365 366 out: 367 if (ret) 368 pr_err("Failed to read max nodes, using default of %d\n", max_node_num); 369 } 370 371 int cpu__max_node(void) 372 { 373 if (unlikely(!max_node_num)) 374 set_max_node_num(); 375 376 return max_node_num; 377 } 378 379 int cpu__max_cpu(void) 380 { 381 if (unlikely(!max_cpu_num)) 382 set_max_cpu_num(); 383 384 return max_cpu_num; 385 } 386 387 int cpu__max_present_cpu(void) 388 { 389 if (unlikely(!max_present_cpu_num)) 390 set_max_cpu_num(); 391 392 return max_present_cpu_num; 393 } 394 395 396 int cpu__get_node(int cpu) 397 { 398 if (unlikely(cpunode_map == NULL)) { 399 pr_debug("cpu_map not initialized\n"); 400 return -1; 401 } 402 403 return cpunode_map[cpu]; 404 } 405 406 static int init_cpunode_map(void) 407 { 408 int i; 409 410 set_max_cpu_num(); 411 set_max_node_num(); 412 413 cpunode_map = calloc(max_cpu_num, sizeof(int)); 414 if (!cpunode_map) { 415 pr_err("%s: calloc failed\n", __func__); 416 return -1; 417 } 418 419 for (i = 0; i < max_cpu_num; i++) 420 cpunode_map[i] = -1; 421 422 return 0; 423 } 424 425 int cpu__setup_cpunode_map(void) 426 { 427 struct dirent *dent1, *dent2; 428 DIR *dir1, *dir2; 429 unsigned int cpu, mem; 430 char buf[PATH_MAX]; 431 char path[PATH_MAX]; 432 const char *mnt; 433 int n; 434 435 /* initialize globals */ 436 if (init_cpunode_map()) 437 return -1; 438 439 mnt = sysfs__mountpoint(); 440 if (!mnt) 441 return 0; 442 443 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt); 444 if (n == PATH_MAX) { 445 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 446 return -1; 447 } 448 449 dir1 = opendir(path); 450 if (!dir1) 451 return 0; 452 453 /* walk tree and setup map */ 454 while ((dent1 = readdir(dir1)) != NULL) { 455 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1) 456 continue; 457 458 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name); 459 if (n == PATH_MAX) { 460 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 461 continue; 462 } 463 464 dir2 = opendir(buf); 465 if (!dir2) 466 continue; 467 while ((dent2 = readdir(dir2)) != NULL) { 468 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1) 469 continue; 470 cpunode_map[cpu] = mem; 471 } 472 closedir(dir2); 473 } 474 closedir(dir1); 475 return 0; 476 } 477 478 bool cpu_map__has(struct perf_cpu_map *cpus, int cpu) 479 { 480 return perf_cpu_map__idx(cpus, cpu) != -1; 481 } 482 483 int cpu_map__cpu(struct perf_cpu_map *cpus, int idx) 484 { 485 return cpus->map[idx]; 486 } 487 488 size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size) 489 { 490 int i, cpu, start = -1; 491 bool first = true; 492 size_t ret = 0; 493 494 #define COMMA first ? "" : "," 495 496 for (i = 0; i < map->nr + 1; i++) { 497 bool last = i == map->nr; 498 499 cpu = last ? INT_MAX : map->map[i]; 500 501 if (start == -1) { 502 start = i; 503 if (last) { 504 ret += snprintf(buf + ret, size - ret, 505 "%s%d", COMMA, 506 map->map[i]); 507 } 508 } else if (((i - start) != (cpu - map->map[start])) || last) { 509 int end = i - 1; 510 511 if (start == end) { 512 ret += snprintf(buf + ret, size - ret, 513 "%s%d", COMMA, 514 map->map[start]); 515 } else { 516 ret += snprintf(buf + ret, size - ret, 517 "%s%d-%d", COMMA, 518 map->map[start], map->map[end]); 519 } 520 first = false; 521 start = i; 522 } 523 } 524 525 #undef COMMA 526 527 pr_debug2("cpumask list: %s\n", buf); 528 return ret; 529 } 530 531 static char hex_char(unsigned char val) 532 { 533 if (val < 10) 534 return val + '0'; 535 if (val < 16) 536 return val - 10 + 'a'; 537 return '?'; 538 } 539 540 size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size) 541 { 542 int i, cpu; 543 char *ptr = buf; 544 unsigned char *bitmap; 545 int last_cpu = cpu_map__cpu(map, map->nr - 1); 546 547 if (buf == NULL) 548 return 0; 549 550 bitmap = zalloc(last_cpu / 8 + 1); 551 if (bitmap == NULL) { 552 buf[0] = '\0'; 553 return 0; 554 } 555 556 for (i = 0; i < map->nr; i++) { 557 cpu = cpu_map__cpu(map, i); 558 bitmap[cpu / 8] |= 1 << (cpu % 8); 559 } 560 561 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) { 562 unsigned char bits = bitmap[cpu / 8]; 563 564 if (cpu % 8) 565 bits >>= 4; 566 else 567 bits &= 0xf; 568 569 *ptr++ = hex_char(bits); 570 if ((cpu % 32) == 0 && cpu > 0) 571 *ptr++ = ','; 572 } 573 *ptr = '\0'; 574 free(bitmap); 575 576 buf[size - 1] = '\0'; 577 return ptr - buf; 578 } 579 580 const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */ 581 { 582 static const struct perf_cpu_map *online = NULL; 583 584 if (!online) 585 online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */ 586 587 return online; 588 } 589