tools/perf/util/cpumap.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include "util.h"
   3 #include <api/fs/fs.h>
   4 #include "../perf.h"
   5 #include "cpumap.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 "sane_ctype.h"
  14
  15 static int max_cpu_num;
  16 static int max_present_cpu_num;
  17 static int max_node_num;
  18 static int *cpunode_map;
  19
  20 static struct cpu_map *cpu_map__default_new(void)
  21 {
  22         struct cpu_map *cpus;
  23         int nr_cpus;
  24
  25         nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
  26         if (nr_cpus < 0)
  27                 return NULL;
  28
  29         cpus = malloc(sizeof(*cpus) + nr_cpus * sizeof(int));
  30         if (cpus != NULL) {
  31                 int i;
  32                 for (i = 0; i < nr_cpus; ++i)
  33                         cpus->map[i] = i;
  34
  35                 cpus->nr = nr_cpus;
  36                 refcount_set(&cpus->refcnt, 1);
  37         }
  38
  39         return cpus;
  40 }
  41
  42 static struct cpu_map *cpu_map__trim_new(int nr_cpus, int *tmp_cpus)
  43 {
  44         size_t payload_size = nr_cpus * sizeof(int);
  45         struct cpu_map *cpus = malloc(sizeof(*cpus) + payload_size);
  46
  47         if (cpus != NULL) {
  48                 cpus->nr = nr_cpus;
  49                 memcpy(cpus->map, tmp_cpus, payload_size);
  50                 refcount_set(&cpus->refcnt, 1);
  51         }
  52
  53         return cpus;
  54 }
  55
  56 struct cpu_map *cpu_map__read(FILE *file)
  57 {
  58         struct cpu_map *cpus = NULL;
  59         int nr_cpus = 0;
  60         int *tmp_cpus = NULL, *tmp;
  61         int max_entries = 0;
  62         int n, cpu, prev;
  63         char sep;
  64
  65         sep = 0;
  66         prev = -1;
  67         for (;;) {
  68                 n = fscanf(file, "%u%c", &cpu, &sep);
  69                 if (n <= 0)
  70                         break;
  71                 if (prev >= 0) {
  72                         int new_max = nr_cpus + cpu - prev - 1;
  73
  74                         if (new_max >= max_entries) {
  75                                 max_entries = new_max + MAX_NR_CPUS / 2;
  76                                 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
  77                                 if (tmp == NULL)
  78                                         goto out_free_tmp;
  79                                 tmp_cpus = tmp;
  80                         }
  81
  82                         while (++prev < cpu)
  83                                 tmp_cpus[nr_cpus++] = prev;
  84                 }
  85                 if (nr_cpus == max_entries) {
  86                         max_entries += MAX_NR_CPUS;
  87                         tmp = realloc(tmp_cpus, max_entries * sizeof(int));
  88                         if (tmp == NULL)
  89                                 goto out_free_tmp;
  90                         tmp_cpus = tmp;
  91                 }
  92
  93                 tmp_cpus[nr_cpus++] = cpu;
  94                 if (n == 2 && sep == '-')
  95                         prev = cpu;
  96                 else
  97                         prev = -1;
  98                 if (n == 1 || sep == '\n')
  99                         break;
 100         }
 101
 102         if (nr_cpus > 0)
 103                 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
 104         else
 105                 cpus = cpu_map__default_new();
 106 out_free_tmp:
 107         free(tmp_cpus);
 108         return cpus;
 109 }
 110
 111 static struct cpu_map *cpu_map__read_all_cpu_map(void)
 112 {
 113         struct cpu_map *cpus = NULL;
 114         FILE *onlnf;
 115
 116         onlnf = fopen("/sys/devices/system/cpu/online", "r");
 117         if (!onlnf)
 118                 return cpu_map__default_new();
 119
 120         cpus = cpu_map__read(onlnf);
 121         fclose(onlnf);
 122         return cpus;
 123 }
 124
 125 struct cpu_map *cpu_map__new(const char *cpu_list)
 126 {
 127         struct cpu_map *cpus = NULL;
 128         unsigned long start_cpu, end_cpu = 0;
 129         char *p = NULL;
 130         int i, nr_cpus = 0;
 131         int *tmp_cpus = NULL, *tmp;
 132         int max_entries = 0;
 133
 134         if (!cpu_list)
 135                 return cpu_map__read_all_cpu_map();
 136
 137         if (!isdigit(*cpu_list))
 138                 goto out;
 139
 140         while (isdigit(*cpu_list)) {
 141                 p = NULL;
 142                 start_cpu = strtoul(cpu_list, &p, 0);
 143                 if (start_cpu >= INT_MAX
 144                     || (*p != '\0' && *p != ',' && *p != '-'))
 145                         goto invalid;
 146
 147                 if (*p == '-') {
 148                         cpu_list = ++p;
 149                         p = NULL;
 150                         end_cpu = strtoul(cpu_list, &p, 0);
 151
 152                         if (end_cpu >= INT_MAX || (*p != '\0' && *p != ','))
 153                                 goto invalid;
 154
 155                         if (end_cpu < start_cpu)
 156                                 goto invalid;
 157                 } else {
 158                         end_cpu = start_cpu;
 159                 }
 160
 161                 for (; start_cpu <= end_cpu; start_cpu++) {
 162                         /* check for duplicates */
 163                         for (i = 0; i < nr_cpus; i++)
 164                                 if (tmp_cpus[i] == (int)start_cpu)
 165                                         goto invalid;
 166
 167                         if (nr_cpus == max_entries) {
 168                                 max_entries += MAX_NR_CPUS;
 169                                 tmp = realloc(tmp_cpus, max_entries * sizeof(int));
 170                                 if (tmp == NULL)
 171                                         goto invalid;
 172                                 tmp_cpus = tmp;
 173                         }
 174                         tmp_cpus[nr_cpus++] = (int)start_cpu;
 175                 }
 176                 if (*p)
 177                         ++p;
 178
 179                 cpu_list = p;
 180         }
 181
 182         if (nr_cpus > 0)
 183                 cpus = cpu_map__trim_new(nr_cpus, tmp_cpus);
 184         else
 185                 cpus = cpu_map__default_new();
 186 invalid:
 187         free(tmp_cpus);
 188 out:
 189         return cpus;
 190 }
 191
 192 static struct cpu_map *cpu_map__from_entries(struct cpu_map_entries *cpus)
 193 {
 194         struct cpu_map *map;
 195
 196         map = cpu_map__empty_new(cpus->nr);
 197         if (map) {
 198                 unsigned i;
 199
 200                 for (i = 0; i < cpus->nr; i++) {
 201                         /*
 202                          * Special treatment for -1, which is not real cpu number,
 203                          * and we need to use (int) -1 to initialize map[i],
 204                          * otherwise it would become 65535.
 205                          */
 206                         if (cpus->cpu[i] == (u16) -1)
 207                                 map->map[i] = -1;
 208                         else
 209                                 map->map[i] = (int) cpus->cpu[i];
 210                 }
 211         }
 212
 213         return map;
 214 }
 215
 216 static struct cpu_map *cpu_map__from_mask(struct cpu_map_mask *mask)
 217 {
 218         struct cpu_map *map;
 219         int nr, nbits = mask->nr * mask->long_size * BITS_PER_BYTE;
 220
 221         nr = bitmap_weight(mask->mask, nbits);
 222
 223         map = cpu_map__empty_new(nr);
 224         if (map) {
 225                 int cpu, i = 0;
 226
 227                 for_each_set_bit(cpu, mask->mask, nbits)
 228                         map->map[i++] = cpu;
 229         }
 230         return map;
 231
 232 }
 233
 234 struct cpu_map *cpu_map__new_data(struct cpu_map_data *data)
 235 {
 236         if (data->type == PERF_CPU_MAP__CPUS)
 237                 return cpu_map__from_entries((struct cpu_map_entries *)data->data);
 238         else
 239                 return cpu_map__from_mask((struct cpu_map_mask *)data->data);
 240 }
 241
 242 size_t cpu_map__fprintf(struct cpu_map *map, FILE *fp)
 243 {
 244 #define BUFSIZE 1024
 245         char buf[BUFSIZE];
 246
 247         cpu_map__snprint(map, buf, sizeof(buf));
 248         return fprintf(fp, "%s\n", buf);
 249 #undef BUFSIZE
 250 }
 251
 252 struct cpu_map *cpu_map__dummy_new(void)
 253 {
 254         struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int));
 255
 256         if (cpus != NULL) {
 257                 cpus->nr = 1;
 258                 cpus->map[0] = -1;
 259                 refcount_set(&cpus->refcnt, 1);
 260         }
 261
 262         return cpus;
 263 }
 264
 265 struct cpu_map *cpu_map__empty_new(int nr)
 266 {
 267         struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
 268
 269         if (cpus != NULL) {
 270                 int i;
 271
 272                 cpus->nr = nr;
 273                 for (i = 0; i < nr; i++)
 274                         cpus->map[i] = -1;
 275
 276                 refcount_set(&cpus->refcnt, 1);
 277         }
 278
 279         return cpus;
 280 }
 281
 282 static void cpu_map__delete(struct cpu_map *map)
 283 {
 284         if (map) {
 285                 WARN_ONCE(refcount_read(&map->refcnt) != 0,
 286                           "cpu_map refcnt unbalanced\n");
 287                 free(map);
 288         }
 289 }
 290
 291 struct cpu_map *cpu_map__get(struct cpu_map *map)
 292 {
 293         if (map)
 294                 refcount_inc(&map->refcnt);
 295         return map;
 296 }
 297
 298 void cpu_map__put(struct cpu_map *map)
 299 {
 300         if (map && refcount_dec_and_test(&map->refcnt))
 301                 cpu_map__delete(map);
 302 }
 303
 304 static int cpu__get_topology_int(int cpu, const char *name, int *value)
 305 {
 306         char path[PATH_MAX];
 307
 308         snprintf(path, PATH_MAX,
 309                 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
 310
 311         return sysfs__read_int(path, value);
 312 }
 313
 314 int cpu_map__get_socket_id(int cpu)
 315 {
 316         int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
 317         return ret ?: value;
 318 }
 319
 320 int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused)
 321 {
 322         int cpu;
 323
 324         if (idx > map->nr)
 325                 return -1;
 326
 327         cpu = map->map[idx];
 328
 329         return cpu_map__get_socket_id(cpu);
 330 }
 331
 332 static int cmp_ids(const void *a, const void *b)
 333 {
 334         return *(int *)a - *(int *)b;
 335 }
 336
 337 int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
 338                        int (*f)(struct cpu_map *map, int cpu, void *data),
 339                        void *data)
 340 {
 341         struct cpu_map *c;
 342         int nr = cpus->nr;
 343         int cpu, s1, s2;
 344
 345         /* allocate as much as possible */
 346         c = calloc(1, sizeof(*c) + nr * sizeof(int));
 347         if (!c)
 348                 return -1;
 349
 350         for (cpu = 0; cpu < nr; cpu++) {
 351                 s1 = f(cpus, cpu, data);
 352                 for (s2 = 0; s2 < c->nr; s2++) {
 353                         if (s1 == c->map[s2])
 354                                 break;
 355                 }
 356                 if (s2 == c->nr) {
 357                         c->map[c->nr] = s1;
 358                         c->nr++;
 359                 }
 360         }
 361         /* ensure we process id in increasing order */
 362         qsort(c->map, c->nr, sizeof(int), cmp_ids);
 363
 364         refcount_set(&c->refcnt, 1);
 365         *res = c;
 366         return 0;
 367 }
 368
 369 int cpu_map__get_core_id(int cpu)
 370 {
 371         int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
 372         return ret ?: value;
 373 }
 374
 375 int cpu_map__get_core(struct cpu_map *map, int idx, void *data)
 376 {
 377         int cpu, s;
 378
 379         if (idx > map->nr)
 380                 return -1;
 381
 382         cpu = map->map[idx];
 383
 384         cpu = cpu_map__get_core_id(cpu);
 385
 386         s = cpu_map__get_socket(map, idx, data);
 387         if (s == -1)
 388                 return -1;
 389
 390         /*
 391          * encode socket in upper 16 bits
 392          * core_id is relative to socket, and
 393          * we need a global id. So we combine
 394          * socket+ core id
 395          */
 396         return (s << 16) | (cpu & 0xffff);
 397 }
 398
 399 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
 400 {
 401         return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
 402 }
 403
 404 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
 405 {
 406         return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
 407 }
 408
 409 /* setup simple routines to easily access node numbers given a cpu number */
 410 static int get_max_num(char *path, int *max)
 411 {
 412         size_t num;
 413         char *buf;
 414         int err = 0;
 415
 416         if (filename__read_str(path, &buf, &num))
 417                 return -1;
 418
 419         buf[num] = '\0';
 420
 421         /* start on the right, to find highest node num */
 422         while (--num) {
 423                 if ((buf[num] == ',') || (buf[num] == '-')) {
 424                         num++;
 425                         break;
 426                 }
 427         }
 428         if (sscanf(&buf[num], "%d", max) < 1) {
 429                 err = -1;
 430                 goto out;
 431         }
 432
 433         /* convert from 0-based to 1-based */
 434         (*max)++;
 435
 436 out:
 437         free(buf);
 438         return err;
 439 }
 440
 441 /* Determine highest possible cpu in the system for sparse allocation */
 442 static void set_max_cpu_num(void)
 443 {
 444         const char *mnt;
 445         char path[PATH_MAX];
 446         int ret = -1;
 447
 448         /* set up default */
 449         max_cpu_num = 4096;
 450         max_present_cpu_num = 4096;
 451
 452         mnt = sysfs__mountpoint();
 453         if (!mnt)
 454                 goto out;
 455
 456         /* get the highest possible cpu number for a sparse allocation */
 457         ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
 458         if (ret == PATH_MAX) {
 459                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 460                 goto out;
 461         }
 462
 463         ret = get_max_num(path, &max_cpu_num);
 464         if (ret)
 465                 goto out;
 466
 467         /* get the highest present cpu number for a sparse allocation */
 468         ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
 469         if (ret == PATH_MAX) {
 470                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 471                 goto out;
 472         }
 473
 474         ret = get_max_num(path, &max_present_cpu_num);
 475
 476 out:
 477         if (ret)
 478                 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
 479 }
 480
 481 /* Determine highest possible node in the system for sparse allocation */
 482 static void set_max_node_num(void)
 483 {
 484         const char *mnt;
 485         char path[PATH_MAX];
 486         int ret = -1;
 487
 488         /* set up default */
 489         max_node_num = 8;
 490
 491         mnt = sysfs__mountpoint();
 492         if (!mnt)
 493                 goto out;
 494
 495         /* get the highest possible cpu number for a sparse allocation */
 496         ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
 497         if (ret == PATH_MAX) {
 498                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 499                 goto out;
 500         }
 501
 502         ret = get_max_num(path, &max_node_num);
 503
 504 out:
 505         if (ret)
 506                 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
 507 }
 508
 509 int cpu__max_node(void)
 510 {
 511         if (unlikely(!max_node_num))
 512                 set_max_node_num();
 513
 514         return max_node_num;
 515 }
 516
 517 int cpu__max_cpu(void)
 518 {
 519         if (unlikely(!max_cpu_num))
 520                 set_max_cpu_num();
 521
 522         return max_cpu_num;
 523 }
 524
 525 int cpu__max_present_cpu(void)
 526 {
 527         if (unlikely(!max_present_cpu_num))
 528                 set_max_cpu_num();
 529
 530         return max_present_cpu_num;
 531 }
 532
 533
 534 int cpu__get_node(int cpu)
 535 {
 536         if (unlikely(cpunode_map == NULL)) {
 537                 pr_debug("cpu_map not initialized\n");
 538                 return -1;
 539         }
 540
 541         return cpunode_map[cpu];
 542 }
 543
 544 static int init_cpunode_map(void)
 545 {
 546         int i;
 547
 548         set_max_cpu_num();
 549         set_max_node_num();
 550
 551         cpunode_map = calloc(max_cpu_num, sizeof(int));
 552         if (!cpunode_map) {
 553                 pr_err("%s: calloc failed\n", __func__);
 554                 return -1;
 555         }
 556
 557         for (i = 0; i < max_cpu_num; i++)
 558                 cpunode_map[i] = -1;
 559
 560         return 0;
 561 }
 562
 563 int cpu__setup_cpunode_map(void)
 564 {
 565         struct dirent *dent1, *dent2;
 566         DIR *dir1, *dir2;
 567         unsigned int cpu, mem;
 568         char buf[PATH_MAX];
 569         char path[PATH_MAX];
 570         const char *mnt;
 571         int n;
 572
 573         /* initialize globals */
 574         if (init_cpunode_map())
 575                 return -1;
 576
 577         mnt = sysfs__mountpoint();
 578         if (!mnt)
 579                 return 0;
 580
 581         n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
 582         if (n == PATH_MAX) {
 583                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 584                 return -1;
 585         }
 586
 587         dir1 = opendir(path);
 588         if (!dir1)
 589                 return 0;
 590
 591         /* walk tree and setup map */
 592         while ((dent1 = readdir(dir1)) != NULL) {
 593                 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
 594                         continue;
 595
 596                 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
 597                 if (n == PATH_MAX) {
 598                         pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 599                         continue;
 600                 }
 601
 602                 dir2 = opendir(buf);
 603                 if (!dir2)
 604                         continue;
 605                 while ((dent2 = readdir(dir2)) != NULL) {
 606                         if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
 607                                 continue;
 608                         cpunode_map[cpu] = mem;
 609                 }
 610                 closedir(dir2);
 611         }
 612         closedir(dir1);
 613         return 0;
 614 }
 615
 616 bool cpu_map__has(struct cpu_map *cpus, int cpu)
 617 {
 618         return cpu_map__idx(cpus, cpu) != -1;
 619 }
 620
 621 int cpu_map__idx(struct cpu_map *cpus, int cpu)
 622 {
 623         int i;
 624
 625         for (i = 0; i < cpus->nr; ++i) {
 626                 if (cpus->map[i] == cpu)
 627                         return i;
 628         }
 629
 630         return -1;
 631 }
 632
 633 int cpu_map__cpu(struct cpu_map *cpus, int idx)
 634 {
 635         return cpus->map[idx];
 636 }
 637
 638 size_t cpu_map__snprint(struct cpu_map *map, char *buf, size_t size)
 639 {
 640         int i, cpu, start = -1;
 641         bool first = true;
 642         size_t ret = 0;
 643
 644 #define COMMA first ? "" : ","
 645
 646         for (i = 0; i < map->nr + 1; i++) {
 647                 bool last = i == map->nr;
 648
 649                 cpu = last ? INT_MAX : map->map[i];
 650
 651                 if (start == -1) {
 652                         start = i;
 653                         if (last) {
 654                                 ret += snprintf(buf + ret, size - ret,
 655                                                 "%s%d", COMMA,
 656                                                 map->map[i]);
 657                         }
 658                 } else if (((i - start) != (cpu - map->map[start])) || last) {
 659                         int end = i - 1;
 660
 661                         if (start == end) {
 662                                 ret += snprintf(buf + ret, size - ret,
 663                                                 "%s%d", COMMA,
 664                                                 map->map[start]);
 665                         } else {
 666                                 ret += snprintf(buf + ret, size - ret,
 667                                                 "%s%d-%d", COMMA,
 668                                                 map->map[start], map->map[end]);
 669                         }
 670                         first = false;
 671                         start = i;
 672                 }
 673         }
 674
 675 #undef COMMA
 676
 677         pr_debug("cpumask list: %s\n", buf);
 678         return ret;
 679 }
 680
 681 static char hex_char(unsigned char val)
 682 {
 683         if (val < 10)
 684                 return val + '0';
 685         if (val < 16)
 686                 return val - 10 + 'a';
 687         return '?';
 688 }
 689
 690 size_t cpu_map__snprint_mask(struct cpu_map *map, char *buf, size_t size)
 691 {
 692         int i, cpu;
 693         char *ptr = buf;
 694         unsigned char *bitmap;
 695         int last_cpu = cpu_map__cpu(map, map->nr - 1);
 696
 697         bitmap = zalloc((last_cpu + 7) / 8);
 698         if (bitmap == NULL) {
 699                 buf[0] = '\0';
 700                 return 0;
 701         }
 702
 703         for (i = 0; i < map->nr; i++) {
 704                 cpu = cpu_map__cpu(map, i);
 705                 bitmap[cpu / 8] |= 1 << (cpu % 8);
 706         }
 707
 708         for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
 709                 unsigned char bits = bitmap[cpu / 8];
 710
 711                 if (cpu % 8)
 712                         bits >>= 4;
 713                 else
 714                         bits &= 0xf;
 715
 716                 *ptr++ = hex_char(bits);
 717                 if ((cpu % 32) == 0 && cpu > 0)
 718                         *ptr++ = ',';
 719         }
 720         *ptr = '\0';
 721         free(bitmap);
 722
 723         buf[size - 1] = '\0';
 724         return ptr - buf;
 725 }