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 #define BUFSIZE 1024
 240         char buf[BUFSIZE];
 241
 242         cpu_map__snprint(map, buf, sizeof(buf));
 243         return fprintf(fp, "%s\n", buf);
 244 #undef BUFSIZE
 245 }
 246
 247 struct cpu_map *cpu_map__dummy_new(void)
 248 {
 249         struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
 250
 251         if (cpus != NULL) {
 252                 cpus->nr = 1;
 253                 cpus->map[0] = -1;
 254                 atomic_set(&cpus->refcnt, 1);
 255         }
 256
 257         return cpus;
 258 }
 259
 260 struct cpu_map *cpu_map__empty_new(int nr)
 261 {
 262         struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
 263
 264         if (cpus != NULL) {
 265                 int i;
 266
 267                 cpus->nr = nr;
 268                 for (i = 0; i < nr; i++)
 269                         cpus->map[i] = -1;
 270
 271                 atomic_set(&cpus->refcnt, 1);
 272         }
 273
 274         return cpus;
 275 }
 276
 277 static void cpu_map__delete(struct cpu_map *map)
 278 {
 279         if (map) {
 280                 WARN_ONCE(atomic_read(&map->refcnt) != 0,
 281                           "cpu_map refcnt unbalanced\n");
 282                 free(map);
 283         }
 284 }
 285
 286 struct cpu_map *cpu_map__get(struct cpu_map *map)
 287 {
 288         if (map)
 289                 atomic_inc(&map->refcnt);
 290         return map;
 291 }
 292
 293 void cpu_map__put(struct cpu_map *map)
 294 {
 295         if (map && atomic_dec_and_test(&map->refcnt))
 296                 cpu_map__delete(map);
 297 }
 298
 299 static int cpu__get_topology_int(int cpu, const char *name, int *value)
 300 {
 301         char path[PATH_MAX];
 302
 303         snprintf(path, PATH_MAX,
 304                 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
 305
 306         return sysfs__read_int(path, value);
 307 }
 308
 309 int cpu_map__get_socket_id(int cpu)
 310 {
 311         int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
 312         return ret ?: value;
 313 }
 314
 315 int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused)
 316 {
 317         int cpu;
 318
 319         if (idx > map->nr)
 320                 return -1;
 321
 322         cpu = map->map[idx];
 323
 324         return cpu_map__get_socket_id(cpu);
 325 }
 326
 327 static int cmp_ids(const void *a, const void *b)
 328 {
 329         return *(int *)a - *(int *)b;
 330 }
 331
 332 int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
 333                        int (*f)(struct cpu_map *map, int cpu, void *data),
 334                        void *data)
 335 {
 336         struct cpu_map *c;
 337         int nr = cpus->nr;
 338         int cpu, s1, s2;
 339
 340         /* allocate as much as possible */
 341         c = calloc(1, sizeof(*c) + nr * sizeof(int));
 342         if (!c)
 343                 return -1;
 344
 345         for (cpu = 0; cpu < nr; cpu++) {
 346                 s1 = f(cpus, cpu, data);
 347                 for (s2 = 0; s2 < c->nr; s2++) {
 348                         if (s1 == c->map[s2])
 349                                 break;
 350                 }
 351                 if (s2 == c->nr) {
 352                         c->map[c->nr] = s1;
 353                         c->nr++;
 354                 }
 355         }
 356         /* ensure we process id in increasing order */
 357         qsort(c->map, c->nr, sizeof(int), cmp_ids);
 358
 359         atomic_set(&c->refcnt, 1);
 360         *res = c;
 361         return 0;
 362 }
 363
 364 int cpu_map__get_core_id(int cpu)
 365 {
 366         int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
 367         return ret ?: value;
 368 }
 369
 370 int cpu_map__get_core(struct cpu_map *map, int idx, void *data)
 371 {
 372         int cpu, s;
 373
 374         if (idx > map->nr)
 375                 return -1;
 376
 377         cpu = map->map[idx];
 378
 379         cpu = cpu_map__get_core_id(cpu);
 380
 381         s = cpu_map__get_socket(map, idx, data);
 382         if (s == -1)
 383                 return -1;
 384
 385         /*
 386          * encode socket in upper 16 bits
 387          * core_id is relative to socket, and
 388          * we need a global id. So we combine
 389          * socket+ core id
 390          */
 391         return (s << 16) | (cpu & 0xffff);
 392 }
 393
 394 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
 395 {
 396         return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
 397 }
 398
 399 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
 400 {
 401         return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
 402 }
 403
 404 /* setup simple routines to easily access node numbers given a cpu number */
 405 static int get_max_num(char *path, int *max)
 406 {
 407         size_t num;
 408         char *buf;
 409         int err = 0;
 410
 411         if (filename__read_str(path, &buf, &num))
 412                 return -1;
 413
 414         buf[num] = '\0';
 415
 416         /* start on the right, to find highest node num */
 417         while (--num) {
 418                 if ((buf[num] == ',') || (buf[num] == '-')) {
 419                         num++;
 420                         break;
 421                 }
 422         }
 423         if (sscanf(&buf[num], "%d", max) < 1) {
 424                 err = -1;
 425                 goto out;
 426         }
 427
 428         /* convert from 0-based to 1-based */
 429         (*max)++;
 430
 431 out:
 432         free(buf);
 433         return err;
 434 }
 435
 436 /* Determine highest possible cpu in the system for sparse allocation */
 437 static void set_max_cpu_num(void)
 438 {
 439         const char *mnt;
 440         char path[PATH_MAX];
 441         int ret = -1;
 442
 443         /* set up default */
 444         max_cpu_num = 4096;
 445
 446         mnt = sysfs__mountpoint();
 447         if (!mnt)
 448                 goto out;
 449
 450         /* get the highest possible cpu number for a sparse allocation */
 451         ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
 452         if (ret == PATH_MAX) {
 453                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 454                 goto out;
 455         }
 456
 457         ret = get_max_num(path, &max_cpu_num);
 458
 459 out:
 460         if (ret)
 461                 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
 462 }
 463
 464 /* Determine highest possible node in the system for sparse allocation */
 465 static void set_max_node_num(void)
 466 {
 467         const char *mnt;
 468         char path[PATH_MAX];
 469         int ret = -1;
 470
 471         /* set up default */
 472         max_node_num = 8;
 473
 474         mnt = sysfs__mountpoint();
 475         if (!mnt)
 476                 goto out;
 477
 478         /* get the highest possible cpu number for a sparse allocation */
 479         ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
 480         if (ret == PATH_MAX) {
 481                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 482                 goto out;
 483         }
 484
 485         ret = get_max_num(path, &max_node_num);
 486
 487 out:
 488         if (ret)
 489                 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
 490 }
 491
 492 int cpu__max_node(void)
 493 {
 494         if (unlikely(!max_node_num))
 495                 set_max_node_num();
 496
 497         return max_node_num;
 498 }
 499
 500 int cpu__max_cpu(void)
 501 {
 502         if (unlikely(!max_cpu_num))
 503                 set_max_cpu_num();
 504
 505         return max_cpu_num;
 506 }
 507
 508 int cpu__get_node(int cpu)
 509 {
 510         if (unlikely(cpunode_map == NULL)) {
 511                 pr_debug("cpu_map not initialized\n");
 512                 return -1;
 513         }
 514
 515         return cpunode_map[cpu];
 516 }
 517
 518 static int init_cpunode_map(void)
 519 {
 520         int i;
 521
 522         set_max_cpu_num();
 523         set_max_node_num();
 524
 525         cpunode_map = calloc(max_cpu_num, sizeof(int));
 526         if (!cpunode_map) {
 527                 pr_err("%s: calloc failed\n", __func__);
 528                 return -1;
 529         }
 530
 531         for (i = 0; i < max_cpu_num; i++)
 532                 cpunode_map[i] = -1;
 533
 534         return 0;
 535 }
 536
 537 int cpu__setup_cpunode_map(void)
 538 {
 539         struct dirent *dent1, *dent2;
 540         DIR *dir1, *dir2;
 541         unsigned int cpu, mem;
 542         char buf[PATH_MAX];
 543         char path[PATH_MAX];
 544         const char *mnt;
 545         int n;
 546
 547         /* initialize globals */
 548         if (init_cpunode_map())
 549                 return -1;
 550
 551         mnt = sysfs__mountpoint();
 552         if (!mnt)
 553                 return 0;
 554
 555         n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
 556         if (n == PATH_MAX) {
 557                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 558                 return -1;
 559         }
 560
 561         dir1 = opendir(path);
 562         if (!dir1)
 563                 return 0;
 564
 565         /* walk tree and setup map */
 566         while ((dent1 = readdir(dir1)) != NULL) {
 567                 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
 568                         continue;
 569
 570                 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
 571                 if (n == PATH_MAX) {
 572                         pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 573                         continue;
 574                 }
 575
 576                 dir2 = opendir(buf);
 577                 if (!dir2)
 578                         continue;
 579                 while ((dent2 = readdir(dir2)) != NULL) {
 580                         if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
 581                                 continue;
 582                         cpunode_map[cpu] = mem;
 583                 }
 584                 closedir(dir2);
 585         }
 586         closedir(dir1);
 587         return 0;
 588 }
 589
 590 bool cpu_map__has(struct cpu_map *cpus, int cpu)
 591 {
 592         return cpu_map__idx(cpus, cpu) != -1;
 593 }
 594
 595 int cpu_map__idx(struct cpu_map *cpus, int cpu)
 596 {
 597         int i;
 598
 599         for (i = 0; i < cpus->nr; ++i) {
 600                 if (cpus->map[i] == cpu)
 601                         return i;
 602         }
 603
 604         return -1;
 605 }
 606
 607 int cpu_map__cpu(struct cpu_map *cpus, int idx)
 608 {
 609         return cpus->map[idx];
 610 }
 611
 612 size_t cpu_map__snprint(struct cpu_map *map, char *buf, size_t size)
 613 {
 614         int i, cpu, start = -1;
 615         bool first = true;
 616         size_t ret = 0;
 617
 618 #define COMMA first ? "" : ","
 619
 620         for (i = 0; i < map->nr + 1; i++) {
 621                 bool last = i == map->nr;
 622
 623                 cpu = last ? INT_MAX : map->map[i];
 624
 625                 if (start == -1) {
 626                         start = i;
 627                         if (last) {
 628                                 ret += snprintf(buf + ret, size - ret,
 629                                                 "%s%d", COMMA,
 630                                                 map->map[i]);
 631                         }
 632                 } else if (((i - start) != (cpu - map->map[start])) || last) {
 633                         int end = i - 1;
 634
 635                         if (start == end) {
 636                                 ret += snprintf(buf + ret, size - ret,
 637                                                 "%s%d", COMMA,
 638                                                 map->map[start]);
 639                         } else {
 640                                 ret += snprintf(buf + ret, size - ret,
 641                                                 "%s%d-%d", COMMA,
 642                                                 map->map[start], map->map[end]);
 643                         }
 644                         first = false;
 645                         start = i;
 646                 }
 647         }
 648
 649 #undef COMMA
 650
 651         pr_debug("cpumask list: %s\n", buf);
 652         return ret;
 653 }