1 #include "util.h" 2 #include <api/fs/fs.h> 3 #include "../perf.h" 4 #include "cpumap.h" 5 #include <assert.h> 6 #include <stdio.h> 7 #include <stdlib.h> 8 #include "asm/bug.h" 9 10 static struct cpu_map *cpu_map__default_new(void) 11 { 12 struct cpu_map *cpus; 13 int nr_cpus; 14 15 nr_cpus = sysconf(_SC_NPROCESSORS_ONLN); 16 if (nr_cpus < 0) 17 return NULL; 18 19 cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int)); 20 if (cpus != NULL) { 21 int i; 22 for (i = 0; i < nr_cpus; ++i) 23 cpus->map[i] = i; 24 25 cpus->nr = nr_cpus; 26 atomic_set(&cpus->refcnt, 1); 27 } 28 29 return cpus; 30 } 31 32 static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus) 33 { 34 size_t payload_size = nr_cpus * sizeof(int); 35 struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size); 36 37 if (cpus != NULL) { 38 cpus->nr = nr_cpus; 39 memcpy(cpus->map, tmp_cpus, payload_size); 40 atomic_set(&cpus->refcnt, 1); 41 } 42 43 return cpus; 44 } 45 46 struct cpu_map *cpu_map__read(FILE *file) 47 { 48 struct cpu_map *cpus = NULL; 49 int nr_cpus = 0; 50 int *tmp_cpus = NULL, *tmp; 51 int max_entries = 0; 52 int n, cpu, prev; 53 char sep; 54 55 sep = 0; 56 prev = -1; 57 for (;;) { 58 n = fscanf(file, "%u%c", &cpu, &sep); 59 if (n <= 0) 60 break; 61 if (prev >= 0) { 62 int new_max = nr_cpus + cpu - prev - 1; 63 64 if (new_max >= max_entries) { 65 max_entries = new_max + MAX_NR_CPUS / 2; 66 tmp = realloc(tmp_cpus, max_entries * sizeof(int)); 67 if (tmp == NULL) 68 goto out_free_tmp; 69 tmp_cpus = tmp; 70 } 71 72 while (++prev < cpu) 73 tmp_cpus[nr_cpus++] = prev; 74 } 75 if (nr_cpus == max_entries) { 76 max_entries += MAX_NR_CPUS; 77 tmp = realloc(tmp_cpus, max_entries * sizeof(int)); 78 if (tmp == NULL) 79 goto out_free_tmp; 80 tmp_cpus = tmp; 81 } 82 83 tmp_cpus[nr_cpus++] = cpu; 84 if (n == 2 && sep == '-') 85 prev = cpu; 86 else 87 prev = -1; 88 if (n == 1 || sep == '\n') 89 break; 90 } 91 92 if (nr_cpus > 0) 93 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus); 94 else 95 cpus = cpu_map__default_new(); 96 out_free_tmp: 97 free(tmp_cpus); 98 return cpus; 99 } 100 101 static struct cpu_map *cpu_map__read_all_cpu_map(void) 102 { 103 struct cpu_map *cpus = NULL; 104 FILE *onlnf; 105 106 onlnf = fopen("/sys/devices/system/cpu/online", "r"); 107 if (!onlnf) 108 return cpu_map__default_new(); 109 110 cpus = cpu_map__read(onlnf); 111 fclose(onlnf); 112 return cpus; 113 } 114 115 struct cpu_map *cpu_map__new(const char *cpu_list) 116 { 117 struct cpu_map *cpus = NULL; 118 unsigned long start_cpu, end_cpu = 0; 119 char *p = NULL; 120 int i, nr_cpus = 0; 121 int *tmp_cpus = NULL, *tmp; 122 int max_entries = 0; 123 124 if (!cpu_list) 125 return cpu_map__read_all_cpu_map(); 126 127 if (!isdigit(*cpu_list)) 128 goto out; 129 130 while (isdigit(*cpu_list)) { 131 p = NULL; 132 start_cpu = strtoul(cpu_list, &p, 0); 133 if (start_cpu >= INT_MAX 134 || (*p != '\0' && *p != ',' && *p != '-')) 135 goto invalid; 136 137 if (*p == '-') { 138 cpu_list = ++p; 139 p = NULL; 140 end_cpu = strtoul(cpu_list, &p, 0); 141 142 if (end_cpu >= INT_MAX || (*p != '\0' && *p != ',')) 143 goto invalid; 144 145 if (end_cpu < start_cpu) 146 goto invalid; 147 } else { 148 end_cpu = start_cpu; 149 } 150 151 for (; start_cpu <= end_cpu; start_cpu++) { 152 /* check for duplicates */ 153 for (i = 0; i < nr_cpus; i++) 154 if (tmp_cpus[i] == (int)start_cpu) 155 goto invalid; 156 157 if (nr_cpus == max_entries) { 158 max_entries += MAX_NR_CPUS; 159 tmp = realloc(tmp_cpus, max_entries * sizeof(int)); 160 if (tmp == NULL) 161 goto invalid; 162 tmp_cpus = tmp; 163 } 164 tmp_cpus[nr_cpus++] = (int)start_cpu; 165 } 166 if (*p) 167 ++p; 168 169 cpu_list = p; 170 } 171 172 if (nr_cpus > 0) 173 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus); 174 else 175 cpus = cpu_map__default_new(); 176 invalid: 177 free(tmp_cpus); 178 out: 179 return cpus; 180 } 181 182 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp) 183 { 184 int i; 185 size_t printed = fprintf(fp, "%d cpu%s: ", 186 map->nr, map->nr > 1 ? "s" : ""); 187 for (i = 0; i < map->nr; ++i) 188 printed += fprintf(fp, "%s%d", i ? ", " : "", map->map[i]); 189 190 return printed + fprintf(fp, "\n"); 191 } 192 193 struct cpu_map *cpu_map__dummy_new(void) 194 { 195 struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int)); 196 197 if (cpus != NULL) { 198 cpus->nr = 1; 199 cpus->map[0] = -1; 200 atomic_set(&cpus->refcnt, 1); 201 } 202 203 return cpus; 204 } 205 206 static void cpu_map__delete(struct cpu_map *map) 207 { 208 if (map) { 209 WARN_ONCE(atomic_read(&map->refcnt) != 0, 210 "cpu_map refcnt unbalanced\n"); 211 free(map); 212 } 213 } 214 215 struct cpu_map *cpu_map__get(struct cpu_map *map) 216 { 217 if (map) 218 atomic_inc(&map->refcnt); 219 return map; 220 } 221 222 void cpu_map__put(struct cpu_map *map) 223 { 224 if (map && atomic_dec_and_test(&map->refcnt)) 225 cpu_map__delete(map); 226 } 227 228 static int cpu__get_topology_int(int cpu, const char *name, int *value) 229 { 230 char path[PATH_MAX]; 231 232 snprintf(path, PATH_MAX, 233 "devices/system/cpu/cpu%d/topology/%s", cpu, name); 234 235 return sysfs__read_int(path, value); 236 } 237 238 int cpu_map__get_socket_id(int cpu) 239 { 240 int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value); 241 return ret ?: value; 242 } 243 244 int cpu_map__get_socket(struct cpu_map *map, int idx) 245 { 246 int cpu; 247 248 if (idx > map->nr) 249 return -1; 250 251 cpu = map->map[idx]; 252 253 return cpu_map__get_socket_id(cpu); 254 } 255 256 static int cmp_ids(const void *a, const void *b) 257 { 258 return *(int *)a - *(int *)b; 259 } 260 261 static int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res, 262 int (*f)(struct cpu_map *map, int cpu)) 263 { 264 struct cpu_map *c; 265 int nr = cpus->nr; 266 int cpu, s1, s2; 267 268 /* allocate as much as possible */ 269 c = calloc(1, sizeof(*c) + nr * sizeof(int)); 270 if (!c) 271 return -1; 272 273 for (cpu = 0; cpu < nr; cpu++) { 274 s1 = f(cpus, cpu); 275 for (s2 = 0; s2 < c->nr; s2++) { 276 if (s1 == c->map[s2]) 277 break; 278 } 279 if (s2 == c->nr) { 280 c->map[c->nr] = s1; 281 c->nr++; 282 } 283 } 284 /* ensure we process id in increasing order */ 285 qsort(c->map, c->nr, sizeof(int), cmp_ids); 286 287 atomic_set(&cpus->refcnt, 1); 288 *res = c; 289 return 0; 290 } 291 292 int cpu_map__get_core_id(int cpu) 293 { 294 int value, ret = cpu__get_topology_int(cpu, "core_id", &value); 295 return ret ?: value; 296 } 297 298 int cpu_map__get_core(struct cpu_map *map, int idx) 299 { 300 int cpu, s; 301 302 if (idx > map->nr) 303 return -1; 304 305 cpu = map->map[idx]; 306 307 cpu = cpu_map__get_core_id(cpu); 308 309 s = cpu_map__get_socket(map, idx); 310 if (s == -1) 311 return -1; 312 313 /* 314 * encode socket in upper 16 bits 315 * core_id is relative to socket, and 316 * we need a global id. So we combine 317 * socket+ core id 318 */ 319 return (s << 16) | (cpu & 0xffff); 320 } 321 322 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp) 323 { 324 return cpu_map__build_map(cpus, sockp, cpu_map__get_socket); 325 } 326 327 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep) 328 { 329 return cpu_map__build_map(cpus, corep, cpu_map__get_core); 330 } 331 332 /* setup simple routines to easily access node numbers given a cpu number */ 333 static int get_max_num(char *path, int *max) 334 { 335 size_t num; 336 char *buf; 337 int err = 0; 338 339 if (filename__read_str(path, &buf, &num)) 340 return -1; 341 342 buf[num] = '\0'; 343 344 /* start on the right, to find highest node num */ 345 while (--num) { 346 if ((buf[num] == ',') || (buf[num] == '-')) { 347 num++; 348 break; 349 } 350 } 351 if (sscanf(&buf[num], "%d", max) < 1) { 352 err = -1; 353 goto out; 354 } 355 356 /* convert from 0-based to 1-based */ 357 (*max)++; 358 359 out: 360 free(buf); 361 return err; 362 } 363 364 /* Determine highest possible cpu in the system for sparse allocation */ 365 static void set_max_cpu_num(void) 366 { 367 const char *mnt; 368 char path[PATH_MAX]; 369 int ret = -1; 370 371 /* set up default */ 372 max_cpu_num = 4096; 373 374 mnt = sysfs__mountpoint(); 375 if (!mnt) 376 goto out; 377 378 /* get the highest possible cpu number for a sparse allocation */ 379 ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt); 380 if (ret == PATH_MAX) { 381 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 382 goto out; 383 } 384 385 ret = get_max_num(path, &max_cpu_num); 386 387 out: 388 if (ret) 389 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num); 390 } 391 392 /* Determine highest possible node in the system for sparse allocation */ 393 static void set_max_node_num(void) 394 { 395 const char *mnt; 396 char path[PATH_MAX]; 397 int ret = -1; 398 399 /* set up default */ 400 max_node_num = 8; 401 402 mnt = sysfs__mountpoint(); 403 if (!mnt) 404 goto out; 405 406 /* get the highest possible cpu number for a sparse allocation */ 407 ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt); 408 if (ret == PATH_MAX) { 409 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 410 goto out; 411 } 412 413 ret = get_max_num(path, &max_node_num); 414 415 out: 416 if (ret) 417 pr_err("Failed to read max nodes, using default of %d\n", max_node_num); 418 } 419 420 static int init_cpunode_map(void) 421 { 422 int i; 423 424 set_max_cpu_num(); 425 set_max_node_num(); 426 427 cpunode_map = calloc(max_cpu_num, sizeof(int)); 428 if (!cpunode_map) { 429 pr_err("%s: calloc failed\n", __func__); 430 return -1; 431 } 432 433 for (i = 0; i < max_cpu_num; i++) 434 cpunode_map[i] = -1; 435 436 return 0; 437 } 438 439 int cpu__setup_cpunode_map(void) 440 { 441 struct dirent *dent1, *dent2; 442 DIR *dir1, *dir2; 443 unsigned int cpu, mem; 444 char buf[PATH_MAX]; 445 char path[PATH_MAX]; 446 const char *mnt; 447 int n; 448 449 /* initialize globals */ 450 if (init_cpunode_map()) 451 return -1; 452 453 mnt = sysfs__mountpoint(); 454 if (!mnt) 455 return 0; 456 457 n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt); 458 if (n == PATH_MAX) { 459 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 460 return -1; 461 } 462 463 dir1 = opendir(path); 464 if (!dir1) 465 return 0; 466 467 /* walk tree and setup map */ 468 while ((dent1 = readdir(dir1)) != NULL) { 469 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1) 470 continue; 471 472 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name); 473 if (n == PATH_MAX) { 474 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX); 475 continue; 476 } 477 478 dir2 = opendir(buf); 479 if (!dir2) 480 continue; 481 while ((dent2 = readdir(dir2)) != NULL) { 482 if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1) 483 continue; 484 cpunode_map[cpu] = mem; 485 } 486 closedir(dir2); 487 } 488 closedir(dir1); 489 return 0; 490 } 491