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 "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 struct cpu_map *cpu_map__empty_new(int nr)
 207 {
 208         struct cpu_map *cpus = malloc(sizeof(*cpus) + sizeof(int) * nr);
 209
 210         if (cpus != NULL) {
 211                 int i;
 212
 213                 cpus->nr = nr;
 214                 for (i = 0; i < nr; i++)
 215                         cpus->map[i] = -1;
 216
 217                 atomic_set(&cpus->refcnt, 1);
 218         }
 219
 220         return cpus;
 221 }
 222
 223 static void cpu_map__delete(struct cpu_map *map)
 224 {
 225         if (map) {
 226                 WARN_ONCE(atomic_read(&map->refcnt) != 0,
 227                           "cpu_map refcnt unbalanced\n");
 228                 free(map);
 229         }
 230 }
 231
 232 struct cpu_map *cpu_map__get(struct cpu_map *map)
 233 {
 234         if (map)
 235                 atomic_inc(&map->refcnt);
 236         return map;
 237 }
 238
 239 void cpu_map__put(struct cpu_map *map)
 240 {
 241         if (map && atomic_dec_and_test(&map->refcnt))
 242                 cpu_map__delete(map);
 243 }
 244
 245 static int cpu__get_topology_int(int cpu, const char *name, int *value)
 246 {
 247         char path[PATH_MAX];
 248
 249         snprintf(path, PATH_MAX,
 250                 "devices/system/cpu/cpu%d/topology/%s", cpu, name);
 251
 252         return sysfs__read_int(path, value);
 253 }
 254
 255 int cpu_map__get_socket_id(int cpu)
 256 {
 257         int value, ret = cpu__get_topology_int(cpu, "physical_package_id", &value);
 258         return ret ?: value;
 259 }
 260
 261 int cpu_map__get_socket(struct cpu_map *map, int idx, void *data __maybe_unused)
 262 {
 263         int cpu;
 264
 265         if (idx > map->nr)
 266                 return -1;
 267
 268         cpu = map->map[idx];
 269
 270         return cpu_map__get_socket_id(cpu);
 271 }
 272
 273 static int cmp_ids(const void *a, const void *b)
 274 {
 275         return *(int *)a - *(int *)b;
 276 }
 277
 278 int cpu_map__build_map(struct cpu_map *cpus, struct cpu_map **res,
 279                        int (*f)(struct cpu_map *map, int cpu, void *data),
 280                        void *data)
 281 {
 282         struct cpu_map *c;
 283         int nr = cpus->nr;
 284         int cpu, s1, s2;
 285
 286         /* allocate as much as possible */
 287         c = calloc(1, sizeof(*c) + nr * sizeof(int));
 288         if (!c)
 289                 return -1;
 290
 291         for (cpu = 0; cpu < nr; cpu++) {
 292                 s1 = f(cpus, cpu, data);
 293                 for (s2 = 0; s2 < c->nr; s2++) {
 294                         if (s1 == c->map[s2])
 295                                 break;
 296                 }
 297                 if (s2 == c->nr) {
 298                         c->map[c->nr] = s1;
 299                         c->nr++;
 300                 }
 301         }
 302         /* ensure we process id in increasing order */
 303         qsort(c->map, c->nr, sizeof(int), cmp_ids);
 304
 305         atomic_set(&c->refcnt, 1);
 306         *res = c;
 307         return 0;
 308 }
 309
 310 int cpu_map__get_core_id(int cpu)
 311 {
 312         int value, ret = cpu__get_topology_int(cpu, "core_id", &value);
 313         return ret ?: value;
 314 }
 315
 316 int cpu_map__get_core(struct cpu_map *map, int idx, void *data)
 317 {
 318         int cpu, s;
 319
 320         if (idx > map->nr)
 321                 return -1;
 322
 323         cpu = map->map[idx];
 324
 325         cpu = cpu_map__get_core_id(cpu);
 326
 327         s = cpu_map__get_socket(map, idx, data);
 328         if (s == -1)
 329                 return -1;
 330
 331         /*
 332          * encode socket in upper 16 bits
 333          * core_id is relative to socket, and
 334          * we need a global id. So we combine
 335          * socket+ core id
 336          */
 337         return (s << 16) | (cpu & 0xffff);
 338 }
 339
 340 int cpu_map__build_socket_map(struct cpu_map *cpus, struct cpu_map **sockp)
 341 {
 342         return cpu_map__build_map(cpus, sockp, cpu_map__get_socket, NULL);
 343 }
 344
 345 int cpu_map__build_core_map(struct cpu_map *cpus, struct cpu_map **corep)
 346 {
 347         return cpu_map__build_map(cpus, corep, cpu_map__get_core, NULL);
 348 }
 349
 350 /* setup simple routines to easily access node numbers given a cpu number */
 351 static int get_max_num(char *path, int *max)
 352 {
 353         size_t num;
 354         char *buf;
 355         int err = 0;
 356
 357         if (filename__read_str(path, &buf, &num))
 358                 return -1;
 359
 360         buf[num] = '\0';
 361
 362         /* start on the right, to find highest node num */
 363         while (--num) {
 364                 if ((buf[num] == ',') || (buf[num] == '-')) {
 365                         num++;
 366                         break;
 367                 }
 368         }
 369         if (sscanf(&buf[num], "%d", max) < 1) {
 370                 err = -1;
 371                 goto out;
 372         }
 373
 374         /* convert from 0-based to 1-based */
 375         (*max)++;
 376
 377 out:
 378         free(buf);
 379         return err;
 380 }
 381
 382 /* Determine highest possible cpu in the system for sparse allocation */
 383 static void set_max_cpu_num(void)
 384 {
 385         const char *mnt;
 386         char path[PATH_MAX];
 387         int ret = -1;
 388
 389         /* set up default */
 390         max_cpu_num = 4096;
 391
 392         mnt = sysfs__mountpoint();
 393         if (!mnt)
 394                 goto out;
 395
 396         /* get the highest possible cpu number for a sparse allocation */
 397         ret = snprintf(path, PATH_MAX, "%s/devices/system/cpu/possible", mnt);
 398         if (ret == PATH_MAX) {
 399                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 400                 goto out;
 401         }
 402
 403         ret = get_max_num(path, &max_cpu_num);
 404
 405 out:
 406         if (ret)
 407                 pr_err("Failed to read max cpus, using default of %d\n", max_cpu_num);
 408 }
 409
 410 /* Determine highest possible node in the system for sparse allocation */
 411 static void set_max_node_num(void)
 412 {
 413         const char *mnt;
 414         char path[PATH_MAX];
 415         int ret = -1;
 416
 417         /* set up default */
 418         max_node_num = 8;
 419
 420         mnt = sysfs__mountpoint();
 421         if (!mnt)
 422                 goto out;
 423
 424         /* get the highest possible cpu number for a sparse allocation */
 425         ret = snprintf(path, PATH_MAX, "%s/devices/system/node/possible", mnt);
 426         if (ret == PATH_MAX) {
 427                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 428                 goto out;
 429         }
 430
 431         ret = get_max_num(path, &max_node_num);
 432
 433 out:
 434         if (ret)
 435                 pr_err("Failed to read max nodes, using default of %d\n", max_node_num);
 436 }
 437
 438 static int init_cpunode_map(void)
 439 {
 440         int i;
 441
 442         set_max_cpu_num();
 443         set_max_node_num();
 444
 445         cpunode_map = calloc(max_cpu_num, sizeof(int));
 446         if (!cpunode_map) {
 447                 pr_err("%s: calloc failed\n", __func__);
 448                 return -1;
 449         }
 450
 451         for (i = 0; i < max_cpu_num; i++)
 452                 cpunode_map[i] = -1;
 453
 454         return 0;
 455 }
 456
 457 int cpu__setup_cpunode_map(void)
 458 {
 459         struct dirent *dent1, *dent2;
 460         DIR *dir1, *dir2;
 461         unsigned int cpu, mem;
 462         char buf[PATH_MAX];
 463         char path[PATH_MAX];
 464         const char *mnt;
 465         int n;
 466
 467         /* initialize globals */
 468         if (init_cpunode_map())
 469                 return -1;
 470
 471         mnt = sysfs__mountpoint();
 472         if (!mnt)
 473                 return 0;
 474
 475         n = snprintf(path, PATH_MAX, "%s/devices/system/node", mnt);
 476         if (n == PATH_MAX) {
 477                 pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 478                 return -1;
 479         }
 480
 481         dir1 = opendir(path);
 482         if (!dir1)
 483                 return 0;
 484
 485         /* walk tree and setup map */
 486         while ((dent1 = readdir(dir1)) != NULL) {
 487                 if (dent1->d_type != DT_DIR || sscanf(dent1->d_name, "node%u", &mem) < 1)
 488                         continue;
 489
 490                 n = snprintf(buf, PATH_MAX, "%s/%s", path, dent1->d_name);
 491                 if (n == PATH_MAX) {
 492                         pr_err("sysfs path crossed PATH_MAX(%d) size\n", PATH_MAX);
 493                         continue;
 494                 }
 495
 496                 dir2 = opendir(buf);
 497                 if (!dir2)
 498                         continue;
 499                 while ((dent2 = readdir(dir2)) != NULL) {
 500                         if (dent2->d_type != DT_LNK || sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
 501                                 continue;
 502                         cpunode_map[cpu] = mem;
 503                 }
 504                 closedir(dir2);
 505         }
 506         closedir(dir1);
 507         return 0;
 508 }