sys/kern/subr_cpu_topology.c

   1 /*
   2  * Copyright (c) 2012 The DragonFly Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in
  12  *    the documentation and/or other materials provided with the
  13  *    distribution.
  14  * 3. Neither the name of The DragonFly Project nor the names of its
  15  *    contributors may be used to endorse or promote products derived
  16  *    from this software without specific, prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  19  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  21  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  22  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  23  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  28  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  *
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/sysctl.h>
  37 #include <sys/sbuf.h>
  38 #include <sys/cpu_topology.h>
  39
  40 #include <machine/smp.h>
  41
  42 #ifndef NAPICID
  43 #define NAPICID 256
  44 #endif
  45
  46 #define INDENT_BUF_SIZE LEVEL_NO*3
  47 #define INVALID_ID -1
  48
  49 /* Per-cpu sysctl nodes and info */
  50 struct per_cpu_sysctl_info {
  51         struct sysctl_ctx_list sysctl_ctx;
  52         struct sysctl_oid *sysctl_tree;
  53         char cpu_name[32];
  54         int physical_id;
  55         int core_id;
  56         char physical_siblings[8*MAXCPU];
  57         char core_siblings[8*MAXCPU];
  58 };
  59 typedef struct per_cpu_sysctl_info per_cpu_sysctl_info_t;
  60
  61 static cpu_node_t cpu_topology_nodes[MAXCPU];   /* Memory for topology */
  62 static cpu_node_t *cpu_root_node;               /* Root node pointer */
  63
  64 static struct sysctl_ctx_list cpu_topology_sysctl_ctx;
  65 static struct sysctl_oid *cpu_topology_sysctl_tree;
  66 static char cpu_topology_members[8*MAXCPU];
  67 static per_cpu_sysctl_info_t *pcpu_sysctl;
  68 static void sbuf_print_cpuset(struct sbuf *sb, cpumask_t *mask);
  69
  70 int cpu_topology_levels_number = 1;
  71 int cpu_topology_core_ids;
  72 int cpu_topology_phys_ids;
  73 cpu_node_t *root_cpu_node;
  74
  75 MALLOC_DEFINE(M_PCPUSYS, "pcpusys", "pcpu sysctl topology");
  76
  77 SYSCTL_INT(_hw, OID_AUTO, cpu_topology_core_ids, CTLFLAG_RW,
  78            &cpu_topology_core_ids, 0, "# of real cores per package");
  79 SYSCTL_INT(_hw, OID_AUTO, cpu_topology_phys_ids, CTLFLAG_RW,
  80            &cpu_topology_phys_ids, 0, "# of physical packages");
  81
  82 /* Get the next valid apicid starting
  83  * from current apicid (curr_apicid
  84  */
  85 static int
  86 get_next_valid_apicid(int curr_apicid)
  87 {
  88         int next_apicid = curr_apicid;
  89         do {
  90                 next_apicid++;
  91         }
  92         while(get_cpuid_from_apicid(next_apicid) == -1 &&
  93            next_apicid < NAPICID);
  94         if (next_apicid == NAPICID) {
  95                 kprintf("Warning: No next valid APICID found. Returning -1\n");
  96                 return -1;
  97         }
  98         return next_apicid;
  99 }
 100
 101 /* Generic topology tree. The parameters have the following meaning:
 102  * - children_no_per_level : the number of children on each level
 103  * - level_types : the type of the level (THREAD, CORE, CHIP, etc)
 104  * - cur_level : the current level of the tree
 105  * - node : the current node
 106  * - last_free_node : the last free node in the global array.
 107  * - cpuid : basicly this are the ids of the leafs
 108  */
 109 static void
 110 build_topology_tree(int *children_no_per_level,
 111    uint8_t *level_types,
 112    int cur_level,
 113    cpu_node_t *node,
 114    cpu_node_t **last_free_node,
 115    int *apicid)
 116 {
 117         int i;
 118
 119         node->child_no = children_no_per_level[cur_level];
 120         node->type = level_types[cur_level];
 121         CPUMASK_ASSZERO(node->members);
 122         node->compute_unit_id = -1;
 123
 124         if (node->child_no == 0) {
 125                 *apicid = get_next_valid_apicid(*apicid);
 126                 CPUMASK_ASSBIT(node->members, get_cpuid_from_apicid(*apicid));
 127                 return;
 128         }
 129
 130         if (node->parent_node == NULL)
 131                 root_cpu_node = node;
 132
 133         for (i = 0; i < node->child_no; i++) {
 134                 node->child_node[i] = *last_free_node;
 135                 (*last_free_node)++;
 136
 137                 node->child_node[i]->parent_node = node;
 138
 139                 build_topology_tree(children_no_per_level,
 140                     level_types,
 141                     cur_level + 1,
 142                     node->child_node[i],
 143                     last_free_node,
 144                     apicid);
 145
 146                 CPUMASK_ORMASK(node->members, node->child_node[i]->members);
 147         }
 148 }
 149
 150 #if defined(__x86_64__) && !defined(_KERNEL_VIRTUAL)
 151 static void
 152 migrate_elements(cpu_node_t **a, int n, int pos)
 153 {
 154         int i;
 155
 156         for (i = pos; i < n - 1 ; i++) {
 157                 a[i] = a[i+1];
 158         }
 159         a[i] = NULL;
 160 }
 161 #endif
 162
 163 /* Build CPU topology. The detection is made by comparing the
 164  * chip, core and logical IDs of each CPU with the IDs of the
 165  * BSP. When we found a match, at that level the CPUs are siblings.
 166  */
 167 static void
 168 build_cpu_topology(int assumed_ncpus)
 169 {
 170         int i;
 171         int BSPID = 0;
 172         int threads_per_core = 0;
 173         int cores_per_chip = 0;
 174         int chips_per_package = 0;
 175         int children_no_per_level[LEVEL_NO];
 176         uint8_t level_types[LEVEL_NO];
 177         int apicid = -1;
 178         cpu_node_t *root = &cpu_topology_nodes[0];
 179         cpu_node_t *last_free_node = root + 1;
 180
 181         detect_cpu_topology();
 182
 183         /*
 184          * Assume that the topology is uniform.
 185          * Find the number of siblings within chip
 186          * and witin core to build up the topology.
 187          */
 188         for (i = 0; i < assumed_ncpus; i++) {
 189                 cpumask_t mask;
 190
 191                 CPUMASK_ASSBIT(mask, i);
 192
 193 #if 0
 194                 /* smp_active_mask has not been initialized yet, ignore */
 195                 if (CPUMASK_TESTMASK(mask, smp_active_mask) == 0)
 196                         continue;
 197 #endif
 198
 199                 if (get_chip_ID(BSPID) == get_chip_ID(i))
 200                         cores_per_chip++;
 201                 else
 202                         continue;
 203
 204                 if (get_core_number_within_chip(BSPID) ==
 205                     get_core_number_within_chip(i))
 206                         threads_per_core++;
 207         }
 208
 209         cores_per_chip /= threads_per_core;
 210         chips_per_package = assumed_ncpus / (cores_per_chip * threads_per_core);
 211
 212         if (bootverbose)
 213                 kprintf("CPU Topology: cores_per_chip: %d; threads_per_core: %d; chips_per_package: %d;\n",
 214                     cores_per_chip, threads_per_core, chips_per_package);
 215
 216         if (threads_per_core > 1) { /* HT available - 4 levels */
 217
 218                 children_no_per_level[0] = chips_per_package;
 219                 children_no_per_level[1] = cores_per_chip;
 220                 children_no_per_level[2] = threads_per_core;
 221                 children_no_per_level[3] = 0;
 222
 223                 level_types[0] = PACKAGE_LEVEL;
 224                 level_types[1] = CHIP_LEVEL;
 225                 level_types[2] = CORE_LEVEL;
 226                 level_types[3] = THREAD_LEVEL;
 227
 228                 build_topology_tree(children_no_per_level,
 229                     level_types,
 230                     0,
 231                     root,
 232                     &last_free_node,
 233                     &apicid);
 234
 235                 cpu_topology_levels_number = 4;
 236
 237         } else if (cores_per_chip > 1) { /* No HT available - 3 levels */
 238
 239                 children_no_per_level[0] = chips_per_package;
 240                 children_no_per_level[1] = cores_per_chip;
 241                 children_no_per_level[2] = 0;
 242
 243                 level_types[0] = PACKAGE_LEVEL;
 244                 level_types[1] = CHIP_LEVEL;
 245                 level_types[2] = CORE_LEVEL;
 246
 247                 build_topology_tree(children_no_per_level,
 248                     level_types,
 249                     0,
 250                     root,
 251                     &last_free_node,
 252                     &apicid);
 253
 254                 cpu_topology_levels_number = 3;
 255
 256         } else { /* No HT and no Multi-Core - 2 levels */
 257
 258                 children_no_per_level[0] = chips_per_package;
 259                 children_no_per_level[1] = 0;
 260
 261                 level_types[0] = PACKAGE_LEVEL;
 262                 level_types[1] = CHIP_LEVEL;
 263
 264                 build_topology_tree(children_no_per_level,
 265                     level_types,
 266                     0,
 267                     root,
 268                     &last_free_node,
 269                     &apicid);
 270
 271                 cpu_topology_levels_number = 2;
 272
 273         }
 274
 275         cpu_root_node = root;
 276
 277
 278 #if defined(__x86_64__) && !defined(_KERNEL_VIRTUAL)
 279         if (fix_amd_topology() == 0) {
 280                 int visited[MAXCPU], i, j, pos, cpuid;
 281                 cpu_node_t *leaf, *parent;
 282
 283                 bzero(visited, MAXCPU * sizeof(int));
 284
 285                 for (i = 0; i < assumed_ncpus; i++) {
 286                         if (visited[i] == 0) {
 287                                 pos = 0;
 288                                 visited[i] = 1;
 289                                 leaf = get_cpu_node_by_cpuid(i);
 290
 291                                 if (leaf->type == CORE_LEVEL) {
 292                                         parent = leaf->parent_node;
 293
 294                                         last_free_node->child_node[0] = leaf;
 295                                         last_free_node->child_no = 1;
 296                                         last_free_node->members = leaf->members;
 297                                         last_free_node->compute_unit_id = leaf->compute_unit_id;
 298                                         last_free_node->parent_node = parent;
 299                                         last_free_node->type = CORE_LEVEL;
 300
 301
 302                                         for (j = 0; j < parent->child_no; j++) {
 303                                                 if (parent->child_node[j] != leaf) {
 304
 305                                                         cpuid = BSFCPUMASK(parent->child_node[j]->members);
 306                                                         if (visited[cpuid] == 0 &&
 307                                                             parent->child_node[j]->compute_unit_id == leaf->compute_unit_id) {
 308
 309                                                                 last_free_node->child_node[last_free_node->child_no] = parent->child_node[j];
 310                                                                 last_free_node->child_no++;
 311                                                                 CPUMASK_ORMASK(last_free_node->members, parent->child_node[j]->members);
 312
 313                                                                 parent->child_node[j]->type = THREAD_LEVEL;
 314                                                                 parent->child_node[j]->parent_node = last_free_node;
 315                                                                 visited[cpuid] = 1;
 316
 317                                                                 migrate_elements(parent->child_node, parent->child_no, j);
 318                                                                 parent->child_no--;
 319                                                                 j--;
 320                                                         }
 321                                                 } else {
 322                                                         pos = j;
 323                                                 }
 324                                         }
 325                                         if (last_free_node->child_no > 1) {
 326                                                 parent->child_node[pos] = last_free_node;
 327                                                 leaf->type = THREAD_LEVEL;
 328                                                 leaf->parent_node = last_free_node;
 329                                                 last_free_node++;
 330                                         }
 331                                 }
 332                         }
 333                 }
 334         }
 335 #endif
 336 }
 337
 338 /* Recursive function helper to print the CPU topology tree */
 339 static void
 340 print_cpu_topology_tree_sysctl_helper(cpu_node_t *node,
 341     struct sbuf *sb,
 342     char * buf,
 343     int buf_len,
 344     int last)
 345 {
 346         int i;
 347         int bsr_member;
 348
 349         sbuf_bcat(sb, buf, buf_len);
 350         if (last) {
 351                 sbuf_printf(sb, "\\-");
 352                 buf[buf_len] = ' ';buf_len++;
 353                 buf[buf_len] = ' ';buf_len++;
 354         } else {
 355                 sbuf_printf(sb, "|-");
 356                 buf[buf_len] = '|';buf_len++;
 357                 buf[buf_len] = ' ';buf_len++;
 358         }
 359
 360         bsr_member = BSRCPUMASK(node->members);
 361
 362         if (node->type == PACKAGE_LEVEL) {
 363                 sbuf_printf(sb,"PACKAGE MEMBERS: ");
 364         } else if (node->type == CHIP_LEVEL) {
 365                 sbuf_printf(sb,"CHIP ID %d: ",
 366                         get_chip_ID(bsr_member));
 367         } else if (node->type == CORE_LEVEL) {
 368                 if (node->compute_unit_id != (uint8_t)-1) {
 369                         sbuf_printf(sb,"Compute Unit ID %d: ",
 370                                 node->compute_unit_id);
 371                 } else {
 372                         sbuf_printf(sb,"CORE ID %d: ",
 373                                 get_core_number_within_chip(bsr_member));
 374                 }
 375         } else if (node->type == THREAD_LEVEL) {
 376                 if (node->compute_unit_id != (uint8_t)-1) {
 377                         sbuf_printf(sb,"CORE ID %d: ",
 378                                 get_core_number_within_chip(bsr_member));
 379                 } else {
 380                         sbuf_printf(sb,"THREAD ID %d: ",
 381                                 get_logical_CPU_number_within_core(bsr_member));
 382                 }
 383         } else {
 384                 sbuf_printf(sb,"UNKNOWN: ");
 385         }
 386         sbuf_print_cpuset(sb, &node->members);
 387         sbuf_printf(sb,"\n");
 388
 389         for (i = 0; i < node->child_no; i++) {
 390                 print_cpu_topology_tree_sysctl_helper(node->child_node[i],
 391                     sb, buf, buf_len, i == (node->child_no -1));
 392         }
 393 }
 394
 395 /* SYSCTL PROCEDURE for printing the CPU Topology tree */
 396 static int
 397 print_cpu_topology_tree_sysctl(SYSCTL_HANDLER_ARGS)
 398 {
 399         struct sbuf *sb;
 400         int ret;
 401         char buf[INDENT_BUF_SIZE];
 402
 403         KASSERT(cpu_root_node != NULL, ("cpu_root_node isn't initialized"));
 404
 405         sb = sbuf_new(NULL, NULL, 500, SBUF_AUTOEXTEND);
 406         if (sb == NULL) {
 407                 return (ENOMEM);
 408         }
 409         sbuf_printf(sb,"\n");
 410         print_cpu_topology_tree_sysctl_helper(cpu_root_node, sb, buf, 0, 1);
 411
 412         sbuf_finish(sb);
 413
 414         ret = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb));
 415
 416         sbuf_delete(sb);
 417
 418         return ret;
 419 }
 420
 421 /* SYSCTL PROCEDURE for printing the CPU Topology level description */
 422 static int
 423 print_cpu_topology_level_description_sysctl(SYSCTL_HANDLER_ARGS)
 424 {
 425         struct sbuf *sb;
 426         int ret;
 427
 428         sb = sbuf_new(NULL, NULL, 500, SBUF_AUTOEXTEND);
 429         if (sb == NULL)
 430                 return (ENOMEM);
 431
 432         if (cpu_topology_levels_number == 4) /* HT available */
 433                 sbuf_printf(sb, "0 - thread; 1 - core; 2 - socket; 3 - anything");
 434         else if (cpu_topology_levels_number == 3) /* No HT available */
 435                 sbuf_printf(sb, "0 - core; 1 - socket; 2 - anything");
 436         else if (cpu_topology_levels_number == 2) /* No HT and no Multi-Core */
 437                 sbuf_printf(sb, "0 - socket; 1 - anything");
 438         else
 439                 sbuf_printf(sb, "Unknown");
 440
 441         sbuf_finish(sb);
 442
 443         ret = SYSCTL_OUT(req, sbuf_data(sb), sbuf_len(sb));
 444
 445         sbuf_delete(sb);
 446
 447         return ret;
 448 }
 449
 450 /* Find a cpu_node_t by a mask */
 451 static cpu_node_t *
 452 get_cpu_node_by_cpumask(cpu_node_t * node,
 453                         cpumask_t mask) {
 454
 455         cpu_node_t * found = NULL;
 456         int i;
 457
 458         if (CPUMASK_CMPMASKEQ(node->members, mask))
 459                 return node;
 460
 461         for (i = 0; i < node->child_no; i++) {
 462                 found = get_cpu_node_by_cpumask(node->child_node[i], mask);
 463                 if (found != NULL) {
 464                         return found;
 465                 }
 466         }
 467         return NULL;
 468 }
 469
 470 cpu_node_t *
 471 get_cpu_node_by_cpuid(int cpuid) {
 472         cpumask_t mask;
 473
 474         CPUMASK_ASSBIT(mask, cpuid);
 475
 476         KASSERT(cpu_root_node != NULL, ("cpu_root_node isn't initialized"));
 477
 478         return get_cpu_node_by_cpumask(cpu_root_node, mask);
 479 }
 480
 481 /* Get the mask of siblings for level_type of a cpuid */
 482 cpumask_t
 483 get_cpumask_from_level(int cpuid,
 484                         uint8_t level_type)
 485 {
 486         cpu_node_t * node;
 487         cpumask_t mask;
 488
 489         CPUMASK_ASSBIT(mask, cpuid);
 490
 491         KASSERT(cpu_root_node != NULL, ("cpu_root_node isn't initialized"));
 492
 493         node = get_cpu_node_by_cpumask(cpu_root_node, mask);
 494
 495         if (node == NULL) {
 496                 CPUMASK_ASSZERO(mask);
 497                 return mask;
 498         }
 499
 500         while (node != NULL) {
 501                 if (node->type == level_type) {
 502                         return node->members;
 503                 }
 504                 node = node->parent_node;
 505         }
 506         CPUMASK_ASSZERO(mask);
 507
 508         return mask;
 509 }
 510
 511 static const cpu_node_t *
 512 get_cpu_node_by_chipid2(const cpu_node_t *node, int chip_id)
 513 {
 514         int cpuid;
 515
 516         if (node->type != CHIP_LEVEL) {
 517                 const cpu_node_t *ret = NULL;
 518                 int i;
 519
 520                 for (i = 0; i < node->child_no; ++i) {
 521                         ret = get_cpu_node_by_chipid2(node->child_node[i],
 522                             chip_id);
 523                         if (ret != NULL)
 524                                 break;
 525                 }
 526                 return ret;
 527         }
 528
 529         cpuid = BSRCPUMASK(node->members);
 530         if (get_chip_ID(cpuid) == chip_id)
 531                 return node;
 532         return NULL;
 533 }
 534
 535 const cpu_node_t *
 536 get_cpu_node_by_chipid(int chip_id)
 537 {
 538         KASSERT(cpu_root_node != NULL, ("cpu_root_node isn't initialized"));
 539         return get_cpu_node_by_chipid2(cpu_root_node, chip_id);
 540 }
 541
 542 /* init pcpu_sysctl structure info */
 543 static void
 544 init_pcpu_topology_sysctl(int assumed_ncpus)
 545 {
 546         struct sbuf sb;
 547         cpumask_t mask;
 548         int min_id = -1;
 549         int max_id = -1;
 550         int i;
 551         int phys_id;
 552
 553         pcpu_sysctl = kmalloc(sizeof(*pcpu_sysctl) * MAXCPU, M_PCPUSYS,
 554                               M_INTWAIT | M_ZERO);
 555
 556         for (i = 0; i < assumed_ncpus; i++) {
 557                 sbuf_new(&sb, pcpu_sysctl[i].cpu_name,
 558                     sizeof(pcpu_sysctl[i].cpu_name), SBUF_FIXEDLEN);
 559                 sbuf_printf(&sb,"cpu%d", i);
 560                 sbuf_finish(&sb);
 561
 562
 563                 /* Get physical siblings */
 564                 mask = get_cpumask_from_level(i, CHIP_LEVEL);
 565                 if (CPUMASK_TESTZERO(mask)) {
 566                         pcpu_sysctl[i].physical_id = INVALID_ID;
 567                         continue;
 568                 }
 569
 570                 sbuf_new(&sb, pcpu_sysctl[i].physical_siblings,
 571                     sizeof(pcpu_sysctl[i].physical_siblings), SBUF_FIXEDLEN);
 572                 sbuf_print_cpuset(&sb, &mask);
 573                 sbuf_trim(&sb);
 574                 sbuf_finish(&sb);
 575
 576                 phys_id = get_chip_ID(i);
 577                 pcpu_sysctl[i].physical_id = phys_id;
 578                 if (min_id < 0 || min_id > phys_id)
 579                         min_id = phys_id;
 580                 if (max_id < 0 || max_id < phys_id)
 581                         max_id = phys_id;
 582
 583                 /* Get core siblings */
 584                 mask = get_cpumask_from_level(i, CORE_LEVEL);
 585                 if (CPUMASK_TESTZERO(mask)) {
 586                         pcpu_sysctl[i].core_id = INVALID_ID;
 587                         continue;
 588                 }
 589
 590                 sbuf_new(&sb, pcpu_sysctl[i].core_siblings,
 591                     sizeof(pcpu_sysctl[i].core_siblings), SBUF_FIXEDLEN);
 592                 sbuf_print_cpuset(&sb, &mask);
 593                 sbuf_trim(&sb);
 594                 sbuf_finish(&sb);
 595
 596                 pcpu_sysctl[i].core_id = get_core_number_within_chip(i);
 597                 if (cpu_topology_core_ids < pcpu_sysctl[i].core_id)
 598                         cpu_topology_core_ids = pcpu_sysctl[i].core_id + 1;
 599
 600         }
 601
 602         /*
 603          * Normalize physical ids so they can be used by the VM system.
 604          * Some systems number starting at 0 others number starting at 1.
 605          */
 606         cpu_topology_phys_ids = max_id - min_id + 1;
 607         if (cpu_topology_phys_ids <= 0)         /* don't crash */
 608                 cpu_topology_phys_ids = 1;
 609         for (i = 0; i < assumed_ncpus; i++) {
 610                 pcpu_sysctl[i].physical_id %= cpu_topology_phys_ids;
 611         }
 612 }
 613
 614 /* Build SYSCTL structure for revealing
 615  * the CPU Topology to user-space.
 616  */
 617 static void
 618 build_sysctl_cpu_topology(int assumed_ncpus)
 619 {
 620         int i;
 621         struct sbuf sb;
 622
 623         /* SYSCTL new leaf for "cpu_topology" */
 624         sysctl_ctx_init(&cpu_topology_sysctl_ctx);
 625         cpu_topology_sysctl_tree = SYSCTL_ADD_NODE(&cpu_topology_sysctl_ctx,
 626             SYSCTL_STATIC_CHILDREN(_hw),
 627             OID_AUTO,
 628             "cpu_topology",
 629             CTLFLAG_RD, 0, "");
 630
 631         /* SYSCTL cpu_topology "tree" entry */
 632         SYSCTL_ADD_PROC(&cpu_topology_sysctl_ctx,
 633             SYSCTL_CHILDREN(cpu_topology_sysctl_tree),
 634             OID_AUTO, "tree", CTLTYPE_STRING | CTLFLAG_RD,
 635             NULL, 0, print_cpu_topology_tree_sysctl, "A",
 636             "Tree print of CPU topology");
 637
 638         /* SYSCTL cpu_topology "level_description" entry */
 639         SYSCTL_ADD_PROC(&cpu_topology_sysctl_ctx,
 640             SYSCTL_CHILDREN(cpu_topology_sysctl_tree),
 641             OID_AUTO, "level_description", CTLTYPE_STRING | CTLFLAG_RD,
 642             NULL, 0, print_cpu_topology_level_description_sysctl, "A",
 643             "Level description of CPU topology");
 644
 645         /* SYSCTL cpu_topology "members" entry */
 646         sbuf_new(&sb, cpu_topology_members,
 647             sizeof(cpu_topology_members), SBUF_FIXEDLEN);
 648         sbuf_print_cpuset(&sb, &cpu_root_node->members);
 649         sbuf_trim(&sb);
 650         sbuf_finish(&sb);
 651         SYSCTL_ADD_STRING(&cpu_topology_sysctl_ctx,
 652             SYSCTL_CHILDREN(cpu_topology_sysctl_tree),
 653             OID_AUTO, "members", CTLFLAG_RD,
 654             cpu_topology_members, 0,
 655             "Members of the CPU Topology");
 656
 657         /* SYSCTL per_cpu info */
 658         for (i = 0; i < assumed_ncpus; i++) {
 659                 /* New leaf : hw.cpu_topology.cpux */
 660                 sysctl_ctx_init(&pcpu_sysctl[i].sysctl_ctx);
 661                 pcpu_sysctl[i].sysctl_tree = SYSCTL_ADD_NODE(&pcpu_sysctl[i].sysctl_ctx,
 662                     SYSCTL_CHILDREN(cpu_topology_sysctl_tree),
 663                     OID_AUTO,
 664                     pcpu_sysctl[i].cpu_name,
 665                     CTLFLAG_RD, 0, "");
 666
 667                 /* Check if the physical_id found is valid */
 668                 if (pcpu_sysctl[i].physical_id == INVALID_ID) {
 669                         continue;
 670                 }
 671
 672                 /* Add physical id info */
 673                 SYSCTL_ADD_INT(&pcpu_sysctl[i].sysctl_ctx,
 674                     SYSCTL_CHILDREN(pcpu_sysctl[i].sysctl_tree),
 675                     OID_AUTO, "physical_id", CTLFLAG_RD,
 676                     &pcpu_sysctl[i].physical_id, 0,
 677                     "Physical ID");
 678
 679                 /* Add physical siblings */
 680                 SYSCTL_ADD_STRING(&pcpu_sysctl[i].sysctl_ctx,
 681                     SYSCTL_CHILDREN(pcpu_sysctl[i].sysctl_tree),
 682                     OID_AUTO, "physical_siblings", CTLFLAG_RD,
 683                     pcpu_sysctl[i].physical_siblings, 0,
 684                     "Physical siblings");
 685
 686                 /* Check if the core_id found is valid */
 687                 if (pcpu_sysctl[i].core_id == INVALID_ID) {
 688                         continue;
 689                 }
 690
 691                 /* Add core id info */
 692                 SYSCTL_ADD_INT(&pcpu_sysctl[i].sysctl_ctx,
 693                     SYSCTL_CHILDREN(pcpu_sysctl[i].sysctl_tree),
 694                     OID_AUTO, "core_id", CTLFLAG_RD,
 695                     &pcpu_sysctl[i].core_id, 0,
 696                     "Core ID");
 697
 698                 /*Add core siblings */
 699                 SYSCTL_ADD_STRING(&pcpu_sysctl[i].sysctl_ctx,
 700                     SYSCTL_CHILDREN(pcpu_sysctl[i].sysctl_tree),
 701                     OID_AUTO, "core_siblings", CTLFLAG_RD,
 702                     pcpu_sysctl[i].core_siblings, 0,
 703                     "Core siblings");
 704         }
 705 }
 706
 707 static
 708 void
 709 sbuf_print_cpuset(struct sbuf *sb, cpumask_t *mask)
 710 {
 711         int i;
 712         int b = -1;
 713         int e = -1;
 714         int more = 0;
 715
 716         sbuf_printf(sb, "cpus(");
 717         CPUSET_FOREACH(i, *mask) {
 718                 if (b < 0) {
 719                         b = i;
 720                         e = b + 1;
 721                         continue;
 722                 }
 723                 if (e == i) {
 724                         ++e;
 725                         continue;
 726                 }
 727                 if (more)
 728                         sbuf_printf(sb, ", ");
 729                 if (b == e - 1) {
 730                         sbuf_printf(sb, "%d", b);
 731                 } else {
 732                         sbuf_printf(sb, "%d-%d", b, e - 1);
 733                 }
 734                 more = 1;
 735                 b = i;
 736                 e = b + 1;
 737         }
 738         if (more)
 739                 sbuf_printf(sb, ", ");
 740         if (b >= 0) {
 741                 if (b == e - 1) {
 742                         sbuf_printf(sb, "%d", b);
 743                 } else {
 744                         sbuf_printf(sb, "%d-%d", b, e - 1);
 745                 }
 746         }
 747         sbuf_printf(sb, ") ");
 748 }
 749
 750 int
 751 get_cpu_core_id(int cpuid)
 752 {
 753         if (pcpu_sysctl)
 754                 return(pcpu_sysctl[cpuid].core_id);
 755         return(0);
 756 }
 757
 758 int
 759 get_cpu_phys_id(int cpuid)
 760 {
 761         if (pcpu_sysctl)
 762                 return(pcpu_sysctl[cpuid].physical_id);
 763         return(0);
 764 }
 765
 766 extern int naps;
 767
 768 /* Build the CPU Topology and SYSCTL Topology tree */
 769 static void
 770 init_cpu_topology(void)
 771 {
 772         int assumed_ncpus;
 773
 774         assumed_ncpus = naps + 1;
 775
 776         build_cpu_topology(assumed_ncpus);
 777         init_pcpu_topology_sysctl(assumed_ncpus);
 778         build_sysctl_cpu_topology(assumed_ncpus);
 779 }
 780 SYSINIT(cpu_topology, SI_BOOT2_CPU_TOPOLOGY, SI_ORDER_FIRST,
 781     init_cpu_topology, NULL);