tools/perf/util/cpumap.c

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