tools/perf/util/cpumap.c

   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_node_id(int cpu)
 210 {
 211         return cpu__get_node(cpu);
 212 }
 213
 214 int cpu_map__get_core(struct perf_cpu_map *map, int idx, void *data)
 215 {
 216         int cpu, s_die;
 217
 218         if (idx > map->nr)
 219                 return -1;
 220
 221         cpu = map->map[idx];
 222
 223         cpu = cpu_map__get_core_id(cpu);
 224
 225         /* s_die is the combination of socket + die id */
 226         s_die = cpu_map__get_die(map, idx, data);
 227         if (s_die == -1)
 228                 return -1;
 229
 230         /*
 231          * encode socket in bit range 31:24
 232          * encode die id in bit range 23:16
 233          * core_id is relative to socket and die,
 234          * we need a global id. So we combine
 235          * socket + die id + core id
 236          */
 237         if (WARN_ONCE(cpu >> 16, "The core id number is too big.\n"))
 238                 return -1;
 239
 240         return (s_die << 16) | (cpu & 0xffff);
 241 }
 242
 243 int cpu_map__get_node(struct perf_cpu_map *map, int idx, void *data __maybe_unused)
 244 {
 245         if (idx < 0 || idx >= map->nr)
 246                 return -1;
 247
 248         return cpu_map__get_node_id(map->map[idx]);
 249 }
 250
 251 int cpu_map__build_socket_map(struct perf_cpu_map *cpus, struct perf_cpu_map **sockp)
 252 {
 253         return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
 254 }
 255
 256 int cpu_map__build_die_map(struct perf_cpu_map *cpus, struct perf_cpu_map **diep)
 257 {
 258         return cpu_map__build_map(cpus, diep, cpu_map__get_die, NULL);
 259 }
 260
 261 int cpu_map__build_core_map(struct perf_cpu_map *cpus, struct perf_cpu_map **corep)
 262 {
 263         return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
 264 }
 265
 266 int cpu_map__build_node_map(struct perf_cpu_map *cpus, struct perf_cpu_map **numap)
 267 {
 268         return cpu_map__build_map(cpus, numap, cpu_map__get_node, NULL);
 269 }
 270
 271 /* setup simple routines to easily access node numbers given a cpu number */
 272 static int get_max_num(char *path, int *max)
 273 {
 274         size_t num;
 275         char *buf;
 276         int err = 0;
 277
 278         if (filename__read_str(path, &buf, &num))
 279                 return -1;
 280
 281         buf[num] = '\0';
 282
 283         /* start on the right, to find highest node num */
 284         while (--num) {
 285                 if ((buf[num] == ',') || (buf[num] == '-')) {
 286                         num++;
 287                         break;
 288                 }
 289         }
 290         if (sscanf(&buf[num], "%d", max) < 1) {
 291                 err = -1;
 292                 goto out;
 293         }
 294
 295         /* convert from 0-based to 1-based */
 296         (*max)++;
 297
 298 out:
 299         free(buf);
 300         return err;
 301 }
 302
 303 /* Determine highest possible cpu in the system for sparse allocation */
 304 static void set_max_cpu_num(void)
 305 {
 306         const char *mnt;
 307         char path[PATH_MAX];
 308         int ret = -1;
 309
 310         /* set up default */
 311         max_cpu_num = 4096;
 312         max_present_cpu_num = 4096;
 313
 314         mnt = sysfs__mountpoint();
 315         if (!mnt)
 316                 goto out;
 317
 318         /* get the highest possible cpu number for a sparse allocation */
 319         ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
 320         if (ret >= PATH_MAX) {
 321                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 322                 goto out;
 323         }
 324
 325         ret = get_max_num(path, &max_cpu_num);
 326         if (ret)
 327                 goto out;
 328
 329         /* get the highest present cpu number for a sparse allocation */
 330         ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/present", mnt);
 331         if (ret >= PATH_MAX) {
 332                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 333                 goto out;
 334         }
 335
 336         ret = get_max_num(path, &max_present_cpu_num);
 337
 338 out:
 339         if (ret)
 340                 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
 341 }
 342
 343 /* Determine highest possible node in the system for sparse allocation */
 344 static void set_max_node_num(void)
 345 {
 346         const char *mnt;
 347         char path[PATH_MAX];
 348         int ret = -1;
 349
 350         /* set up default */
 351         max_node_num = 8;
 352
 353         mnt = sysfs__mountpoint();
 354         if (!mnt)
 355                 goto out;
 356
 357         /* get the highest possible cpu number for a sparse allocation */
 358         ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
 359         if (ret >= PATH_MAX) {
 360                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 361                 goto out;
 362         }
 363
 364         ret = get_max_num(path, &max_node_num);
 365
 366 out:
 367         if (ret)
 368                 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
 369 }
 370
 371 int cpu__max_node(void)
 372 {
 373         if (unlikely(!max_node_num))
 374                 set_max_node_num();
 375
 376         return max_node_num;
 377 }
 378
 379 int cpu__max_cpu(void)
 380 {
 381         if (unlikely(!max_cpu_num))
 382                 set_max_cpu_num();
 383
 384         return max_cpu_num;
 385 }
 386
 387 int cpu__max_present_cpu(void)
 388 {
 389         if (unlikely(!max_present_cpu_num))
 390                 set_max_cpu_num();
 391
 392         return max_present_cpu_num;
 393 }
 394
 395
 396 int cpu__get_node(int cpu)
 397 {
 398         if (unlikely(cpunode_map == NULL)) {
 399                 pr_debug("cpu_map not initialized\n");
 400                 return -1;
 401         }
 402
 403         return cpunode_map[cpu];
 404 }
 405
 406 static int init_cpunode_map(void)
 407 {
 408         int i;
 409
 410         set_max_cpu_num();
 411         set_max_node_num();
 412
 413         cpunode_map = calloc(max_cpu_num, sizeof(int));
 414         if (!cpunode_map) {
 415                 pr_err("%s: calloc failed\n", __func__);
 416                 return -1;
 417         }
 418
 419         for (i = 0; i < max_cpu_num; i++)
 420                 cpunode_map[i] = -1;
 421
 422         return 0;
 423 }
 424
 425 int cpu__setup_cpunode_map(void)
 426 {
 427         struct dirent *dent1, *dent2;
 428         DIR *dir1, *dir2;
 429         unsigned int cpu, mem;
 430         char buf[PATH_MAX];
 431         char path[PATH_MAX];
 432         const char *mnt;
 433         int n;
 434
 435         /* initialize globals */
 436         if (init_cpunode_map())
 437                 return -1;
 438
 439         mnt = sysfs__mountpoint();
 440         if (!mnt)
 441                 return 0;
 442
 443         n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
 444         if (n >= PATH_MAX) {
 445                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 446                 return -1;
 447         }
 448
 449         dir1 = opendir(path);
 450         if (!dir1)
 451                 return 0;
 452
 453         /* walk tree and setup map */
 454         while ((dent1 = readdir(dir1)) != NULL) {
 455                 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
 456                         continue;
 457
 458                 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
 459                 if (n >= PATH_MAX) {
 460                         pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 461                         continue;
 462                 }
 463
 464                 dir2 = opendir(buf);
 465                 if (!dir2)
 466                         continue;
 467                 while ((dent2 = readdir(dir2)) != NULL) {
 468                         if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
 469                                 continue;
 470                         cpunode_map[cpu] = mem;
 471                 }
 472                 closedir(dir2);
 473         }
 474         closedir(dir1);
 475         return 0;
 476 }
 477
 478 bool cpu_map__has(struct perf_cpu_map *cpus, int cpu)
 479 {
 480         return perf_cpu_map__idx(cpus, cpu) != -1;
 481 }
 482
 483 int cpu_map__cpu(struct perf_cpu_map *cpus, int idx)
 484 {
 485         return cpus->map[idx];
 486 }
 487
 488 size_t cpu_map__snprint(struct perf_cpu_map *map, char *buf, size_t size)
 489 {
 490         int i, cpu, start = -1;
 491         bool first = true;
 492         size_t ret = 0;
 493
 494 #define COMMA first ? "" : ","
 495
 496         for (i = 0; i < map->nr + 1; i++) {
 497                 bool last = i == map->nr;
 498
 499                 cpu = last ? INT_MAX : map->map[i];
 500
 501                 if (start == -1) {
 502                         start = i;
 503                         if (last) {
 504                                 ret += snprintf(buf + ret, size - ret,
 505                                                 "%s%d", COMMA,
 506                                                 map->map[i]);
 507                         }
 508                 } else if (((i - start) != (cpu - map->map[start])) || last) {
 509                         int end = i - 1;
 510
 511                         if (start == end) {
 512                                 ret += snprintf(buf + ret, size - ret,
 513                                                 "%s%d", COMMA,
 514                                                 map->map[start]);
 515                         } else {
 516                                 ret += snprintf(buf + ret, size - ret,
 517                                                 "%s%d-%d", COMMA,
 518                                                 map->map[start], map->map[end]);
 519                         }
 520                         first = false;
 521                         start = i;
 522                 }
 523         }
 524
 525 #undef COMMA
 526
 527         pr_debug2("cpumask list: %s\n", buf);
 528         return ret;
 529 }
 530
 531 static char hex_char(unsigned char val)
 532 {
 533         if (val < 10)
 534                 return val + '0';
 535         if (val < 16)
 536                 return val - 10 + 'a';
 537         return '?';
 538 }
 539
 540 size_t cpu_map__snprint_mask(struct perf_cpu_map *map, char *buf, size_t size)
 541 {
 542         int i, cpu;
 543         char *ptr = buf;
 544         unsigned char *bitmap;
 545         int last_cpu = cpu_map__cpu(map, map->nr - 1);
 546
 547         if (buf == NULL)
 548                 return 0;
 549
 550         bitmap = zalloc(last_cpu / 8 + 1);
 551         if (bitmap == NULL) {
 552                 buf[0] = '\0';
 553                 return 0;
 554         }
 555
 556         for (i = 0; i < map->nr; i++) {
 557                 cpu = cpu_map__cpu(map, i);
 558                 bitmap[cpu / 8] |= 1 << (cpu % 8);
 559         }
 560
 561         for (cpu = last_cpu / 4 * 4; cpu >= 0; cpu -= 4) {
 562                 unsigned char bits = bitmap[cpu / 8];
 563
 564                 if (cpu % 8)
 565                         bits >>= 4;
 566                 else
 567                         bits &= 0xf;
 568
 569                 *ptr++ = hex_char(bits);
 570                 if ((cpu % 32) == 0 && cpu > 0)
 571                         *ptr++ = ',';
 572         }
 573         *ptr = '\0';
 574         free(bitmap);
 575
 576         buf[size - 1] = '\0';
 577         return ptr - buf;
 578 }
 579
 580 const struct perf_cpu_map *cpu_map__online(void) /* thread unsafe */
 581 {
 582         static const struct perf_cpu_map *online = NULL;
 583
 584         if (!online)
 585                 online = perf_cpu_map__new(NULL); /* from /sys/devices/system/cpu/online */
 586
 587         return online;
 588 }