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_core(struct perf_cpu_map *map, int idx, void *data) 210 { 211 int cpu, s_die; 212 213 if (idx > map->nr) 214 return -1; 215 216 cpu = map->map[idx]; 217 218 cpu = cpu_map__get_core_id(cpu); 219 220 /* s_die is the combination of socket + die id */ 221 s_die = cpu_map__get_die(map, idx, data); 222 if (s_die == -1) 223 return -1; 224 225 /* 226 * encode socket in bit range 31:24 227 * encode die id in bit range 23:16 228 * core_id is relative to socket and die, 229 * we need a global id. So we combine 230 * socket + die id + core id 231 */ 232 if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n")) 233 return -1; 234 235 return (s_die << 16) | (cpu & 0xffff); 236 } 237 238 int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct perf_cpu_map **sockp) 239 { 240 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL); 241 } 242 243 int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct perf_cpu_map **diep) 244 { 245 return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL); 246 } 247 248 int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct perf_cpu_map **corep) 249 { 250 return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL); 251 } 252 253 /* setup simple routines to easily access node numbers given a cpu number */ 254 static int get_max_num(char *path, int *max) 255 { 256 size_t num; 257 char *buf; 258 int err = 0; 259 260 if (filename__read_str(path, &buf, &num)) 261 return -1; 262 263 buf[num] = '\0'; 264 265 /* start on the right, to find highest node num */ 266 while (--num) { 267 if ((buf[num] == ',') || (buf[num] == '-')) { 268 num++; 269 break; 270 } 271 } 272 if (sscanf(&buf[num], "%d", max) < 1) { 273 err = -1; 274 goto out; 275 } 276 277 /* convert from 0-based to 1-based */ 278 (*max)++; 279 280 out: 281 free(buf); 282 return err; 283 } 284 285 /* Determine highest possible cpu in the system for sparse allocation */ 286 static void set_max_cpu_num(void) 287 { 288 const char *mnt; 289 char path[PATH_MAX]; 290 int ret = -1; 291 292 /* set up default */ 293 max_cpu_num = 4096; 294 max_present_cpu_num = 4096; 295 296 mnt = sysfs__mountpoint(); 297 if (!mnt) 298 goto out; 299 300 /* get the highest possible cpu number for a sparse allocation */ 301 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt); 302 if (ret == PATH_MAX) { 303 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 304 goto out; 305 } 306 307 ret = get_max_num(path, &max_cpu_num); 308 if (ret) 309 goto out; 310 311 /* get the highest present cpu number for a sparse allocation */ 312 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt); 313 if (ret == PATH_MAX) { 314 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 315 goto out; 316 } 317 318 ret = get_max_num(path, &max_present_cpu_num); 319 320 out: 321 if (ret) 322 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num); 323 } 324 325 /* Determine highest possible node in the system for sparse allocation */ 326 static void set_max_node_num(void) 327 { 328 const char *mnt; 329 char path[PATH_MAX]; 330 int ret = -1; 331 332 /* set up default */ 333 max_node_num = 8; 334 335 mnt = sysfs__mountpoint(); 336 if (!mnt) 337 goto out; 338 339 /* get the highest possible cpu number for a sparse allocation */ 340 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt); 341 if (ret == PATH_MAX) { 342 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 343 goto out; 344 } 345 346 ret = get_max_num(path, &max_node_num); 347 348 out: 349 if (ret) 350 pr_err("Failed to read max nodes, using default of %d\n", max_node_num); 351 } 352 353 int cpu__max_node(void) 354 { 355 if (unlikely(!max_node_num)) 356 set_max_node_num(); 357 358 return max_node_num; 359 } 360 361 int cpu__max_cpu(void) 362 { 363 if (unlikely(!max_cpu_num)) 364 set_max_cpu_num(); 365 366 return max_cpu_num; 367 } 368 369 int cpu__max_present_cpu(void) 370 { 371 if (unlikely(!max_present_cpu_num)) 372 set_max_cpu_num(); 373 374 return max_present_cpu_num; 375 } 376 377 378 int cpu__get_node(int cpu) 379 { 380 if (unlikely(cpunode_map == NULL)) { 381 pr_debug("cpu_map not initialized\n"); 382 return -1; 383 } 384 385 return cpunode_map[cpu]; 386 } 387 388 static int init_cpunode_map(void) 389 { 390 int i; 391 392 set_max_cpu_num(); 393 set_max_node_num(); 394 395 cpunode_map = calloc(max_cpu_num, sizeof(int)); 396 if (!cpunode_map) { 397 pr_err("%s: calloc failed\n", __func__); 398 return -1; 399 } 400 401 for (i = 0; i < max_cpu_num; i++) 402 cpunode_map[i] = -1; 403 404 return 0; 405 } 406 407 int cpu__setup_cpunode_map(void) 408 { 409 struct dirent *dent1, *dent2; 410 DIR *dir1, *dir2; 411 unsigned int cpu, mem; 412 char buf[PATH_MAX]; 413 char path[PATH_MAX]; 414 const char *mnt; 415 int n; 416 417 /* initialize globals */ 418 if (init_cpunode_map()) 419 return -1; 420 421 mnt = sysfs__mountpoint(); 422 if (!mnt) 423 return 0; 424 425 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt); 426 if (n == PATH_MAX) { 427 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 428 return -1; 429 } 430 431 dir1 = opendir(path); 432 if (!dir1) 433 return 0; 434 435 /* walk tree and setup map */ 436 while ((dent1 = readdir(dir1)) != NULL) { 437 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1) 438 continue; 439 440 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name); 441 if (n == PATH_MAX) { 442 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 443 continue; 444 } 445 446 dir2 = opendir(buf); 447 if (!dir2) 448 continue; 449 while ((dent2 = readdir(dir2)) != NULL) { 450 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1) 451 continue; 452 cpunode_map[cpu] = mem; 453 } 454 closedir(dir2); 455 } 456 closedir(dir1); 457 return 0; 458 } 459 460 bool cpu_map__has(struct perf_cpu_map *cpus, int cpu) 461 { 462 return perf_cpu_map__idx(cpus, cpu) != -1; 463 } 464 465 int cpu_map__cpu(struct perf_cpu_map *cpus, int idx) 466 { 467 return cpus->map[idx]; 468 } 469 470 size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size) 471 { 472 int i, cpu, start = -1; 473 bool first = true; 474 size_t ret = 0; 475 476 #define COMMA first ? "" : "," 477 478 for (i = 0; i < map->nr + 1; i++) { 479 bool last = i == map->nr; 480 481 cpu = last ? INT_MAX : map->map[i]; 482 483 if (start == -1) { 484 start = i; 485 if (last) { 486 ret += snprintf(buf + ret, size - ret, 487 "%s%d", COMMA, 488 map->map[i]); 489 } 490 } else if (((i - start) != (cpu - map->map[start])) || last) { 491 int end = i - 1; 492 493 if (start == end) { 494 ret += snprintf(buf + ret, size - ret, 495 "%s%d", COMMA, 496 map->map[start]); 497 } else { 498 ret += snprintf(buf + ret, size - ret, 499 "%s%d-%d", COMMA, 500 map->map[start], map->map[end]); 501 } 502 first = false; 503 start = i; 504 } 505 } 506 507 #undef COMMA 508 509 pr_debug2("cpumask list: %s\n", buf); 510 return ret; 511 } 512 513 static char hex_char(unsigned char val) 514 { 515 if (val < 10) 516 return val + '0'; 517 if (val < 16) 518 return val - 10 + 'a'; 519 return '?'; 520 } 521 522 size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size) 523 { 524 int i, cpu; 525 char *ptr = buf; 526 unsigned char *bitmap; 527 int last_cpu = cpu_map__cpu(map, map->nr - 1); 528 529 if (buf == NULL) 530 return 0; 531 532 bitmap = zalloc(last_cpu / 8 + 1); 533 if (bitmap == NULL) { 534 buf[0] = '\0'; 535 return 0; 536 } 537 538 for (i = 0; i < map->nr; i++) { 539 cpu = cpu_map__cpu(map, i); 540 bitmap[cpu / 8] |= 1 << (cpu % 8); 541 } 542 543 for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) { 544 unsigned char bits = bitmap[cpu / 8]; 545 546 if (cpu % 8) 547 bits >>= 4; 548 else 549 bits &= 0xf; 550 551 *ptr++ = hex_char(bits); 552 if ((cpu % 32) == 0 && cpu > 0) 553 *ptr++ = ','; 554 } 555 *ptr = '\0'; 556 free(bitmap); 557 558 buf[size - 1] = '\0'; 559 return ptr - buf; 560 } 561 562 const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */ 563 { 564 static const struct perf_cpu_map *online = NULL; 565 566 if (!online) 567 online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */ 568 569 return online; 570 } 571