arch/x86/mm/numa_64.c

   1 /*
   2  * Generic VM initialization for x86-64 NUMA setups.
   3  * Copyright 2002,2003 Andi Kleen, SuSE Labs.
   4  */
   5 #include <linux/kernel.h>
   6 #include <linux/mm.h>
   7 #include <linux/string.h>
   8 #include <linux/init.h>
   9 #include <linux/bootmem.h>
  10 #include <linux/mmzone.h>
  11 #include <linux/ctype.h>
  12 #include <linux/module.h>
  13 #include <linux/nodemask.h>
  14 #include <linux/sched.h>
  15
  16 #include <asm/e820.h>
  17 #include <asm/proto.h>
  18 #include <asm/dma.h>
  19 #include <asm/numa.h>
  20 #include <asm/acpi.h>
  21 #include <asm/k8.h>
  22
  23 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  24 EXPORT_SYMBOL(node_data);
  25
  26 struct memnode memnode;
  27
  28 s16 apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
  29         [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
  30 };
  31
  32 int numa_off __initdata;
  33 static unsigned long __initdata nodemap_addr;
  34 static unsigned long __initdata nodemap_size;
  35
  36 DEFINE_PER_CPU(int, node_number) = 0;
  37 EXPORT_PER_CPU_SYMBOL(node_number);
  38
  39 /*
  40  * Map cpu index to node index
  41  */
  42 DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE);
  43 EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map);
  44
  45 /*
  46  * Given a shift value, try to populate memnodemap[]
  47  * Returns :
  48  * 1 if OK
  49  * 0 if memnodmap[] too small (of shift too small)
  50  * -1 if node overlap or lost ram (shift too big)
  51  */
  52 static int __init populate_memnodemap(const struct bootnode *nodes,
  53                                       int numnodes, int shift, int *nodeids)
  54 {
  55         unsigned long addr, end;
  56         int i, res = -1;
  57
  58         memset(memnodemap, 0xff, sizeof(s16)*memnodemapsize);
  59         for (i = 0; i < numnodes; i++) {
  60                 addr = nodes[i].start;
  61                 end = nodes[i].end;
  62                 if (addr >= end)
  63                         continue;
  64                 if ((end >> shift) >= memnodemapsize)
  65                         return 0;
  66                 do {
  67                         if (memnodemap[addr >> shift] != NUMA_NO_NODE)
  68                                 return -1;
  69
  70                         if (!nodeids)
  71                                 memnodemap[addr >> shift] = i;
  72                         else
  73                                 memnodemap[addr >> shift] = nodeids[i];
  74
  75                         addr += (1UL << shift);
  76                 } while (addr < end);
  77                 res = 1;
  78         }
  79         return res;
  80 }
  81
  82 static int __init allocate_cachealigned_memnodemap(void)
  83 {
  84         unsigned long addr;
  85
  86         memnodemap = memnode.embedded_map;
  87         if (memnodemapsize <= ARRAY_SIZE(memnode.embedded_map))
  88                 return 0;
  89
  90         addr = 0x8000;
  91         nodemap_size = roundup(sizeof(s16) * memnodemapsize, L1_CACHE_BYTES);
  92         nodemap_addr = find_e820_area(addr, max_pfn<<PAGE_SHIFT,
  93                                       nodemap_size, L1_CACHE_BYTES);
  94         if (nodemap_addr == -1UL) {
  95                 printk(KERN_ERR
  96                        "NUMA: Unable to allocate Memory to Node hash map\n");
  97                 nodemap_addr = nodemap_size = 0;
  98                 return -1;
  99         }
 100         memnodemap = phys_to_virt(nodemap_addr);
 101         reserve_early(nodemap_addr, nodemap_addr + nodemap_size, "MEMNODEMAP");
 102
 103         printk(KERN_DEBUG "NUMA: Allocated memnodemap from %lx - %lx\n",
 104                nodemap_addr, nodemap_addr + nodemap_size);
 105         return 0;
 106 }
 107
 108 /*
 109  * The LSB of all start and end addresses in the node map is the value of the
 110  * maximum possible shift.
 111  */
 112 static int __init extract_lsb_from_nodes(const struct bootnode *nodes,
 113                                          int numnodes)
 114 {
 115         int i, nodes_used = 0;
 116         unsigned long start, end;
 117         unsigned long bitfield = 0, memtop = 0;
 118
 119         for (i = 0; i < numnodes; i++) {
 120                 start = nodes[i].start;
 121                 end = nodes[i].end;
 122                 if (start >= end)
 123                         continue;
 124                 bitfield |= start;
 125                 nodes_used++;
 126                 if (end > memtop)
 127                         memtop = end;
 128         }
 129         if (nodes_used <= 1)
 130                 i = 63;
 131         else
 132                 i = find_first_bit(&bitfield, sizeof(unsigned long)*8);
 133         memnodemapsize = (memtop >> i)+1;
 134         return i;
 135 }
 136
 137 int __init compute_hash_shift(struct bootnode *nodes, int numnodes,
 138                               int *nodeids)
 139 {
 140         int shift;
 141
 142         shift = extract_lsb_from_nodes(nodes, numnodes);
 143         if (allocate_cachealigned_memnodemap())
 144                 return -1;
 145         printk(KERN_DEBUG "NUMA: Using %d for the hash shift.\n",
 146                 shift);
 147
 148         if (populate_memnodemap(nodes, numnodes, shift, nodeids) != 1) {
 149                 printk(KERN_INFO "Your memory is not aligned you need to "
 150                        "rebuild your kernel with a bigger NODEMAPSIZE "
 151                        "shift=%d\n", shift);
 152                 return -1;
 153         }
 154         return shift;
 155 }
 156
 157 int __meminit  __early_pfn_to_nid(unsigned long pfn)
 158 {
 159         return phys_to_nid(pfn << PAGE_SHIFT);
 160 }
 161
 162 static void * __init early_node_mem(int nodeid, unsigned long start,
 163                                     unsigned long end, unsigned long size,
 164                                     unsigned long align)
 165 {
 166         unsigned long mem = find_e820_area(start, end, size, align);
 167         void *ptr;
 168
 169         if (mem != -1L)
 170                 return __va(mem);
 171
 172         ptr = __alloc_bootmem_nopanic(size, align, __pa(MAX_DMA_ADDRESS));
 173         if (ptr == NULL) {
 174                 printk(KERN_ERR "Cannot find %lu bytes in node %d\n",
 175                        size, nodeid);
 176                 return NULL;
 177         }
 178         return ptr;
 179 }
 180
 181 /* Initialize bootmem allocator for a node */
 182 void __init setup_node_bootmem(int nodeid, unsigned long start,
 183                                unsigned long end)
 184 {
 185         unsigned long start_pfn, last_pfn, bootmap_pages, bootmap_size;
 186         unsigned long bootmap_start, nodedata_phys;
 187         void *bootmap;
 188         const int pgdat_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
 189         int nid;
 190
 191         if (!end)
 192                 return;
 193
 194         start = roundup(start, ZONE_ALIGN);
 195
 196         printk(KERN_INFO "Bootmem setup node %d %016lx-%016lx\n", nodeid,
 197                start, end);
 198
 199         start_pfn = start >> PAGE_SHIFT;
 200         last_pfn = end >> PAGE_SHIFT;
 201
 202         node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size,
 203                                            SMP_CACHE_BYTES);
 204         if (node_data[nodeid] == NULL)
 205                 return;
 206         nodedata_phys = __pa(node_data[nodeid]);
 207         printk(KERN_INFO "  NODE_DATA [%016lx - %016lx]\n", nodedata_phys,
 208                 nodedata_phys + pgdat_size - 1);
 209
 210         memset(NODE_DATA(nodeid), 0, sizeof(pg_data_t));
 211         NODE_DATA(nodeid)->bdata = &bootmem_node_data[nodeid];
 212         NODE_DATA(nodeid)->node_start_pfn = start_pfn;
 213         NODE_DATA(nodeid)->node_spanned_pages = last_pfn - start_pfn;
 214
 215         /*
 216          * Find a place for the bootmem map
 217          * nodedata_phys could be on other nodes by alloc_bootmem,
 218          * so need to sure bootmap_start not to be small, otherwise
 219          * early_node_mem will get that with find_e820_area instead
 220          * of alloc_bootmem, that could clash with reserved range
 221          */
 222         bootmap_pages = bootmem_bootmap_pages(last_pfn - start_pfn);
 223         nid = phys_to_nid(nodedata_phys);
 224         if (nid == nodeid)
 225                 bootmap_start = roundup(nodedata_phys + pgdat_size, PAGE_SIZE);
 226         else
 227                 bootmap_start = roundup(start, PAGE_SIZE);
 228         /*
 229          * SMP_CACHE_BYTES could be enough, but init_bootmem_node like
 230          * to use that to align to PAGE_SIZE
 231          */
 232         bootmap = early_node_mem(nodeid, bootmap_start, end,
 233                                  bootmap_pages<<PAGE_SHIFT, PAGE_SIZE);
 234         if (bootmap == NULL)  {
 235                 if (nodedata_phys < start || nodedata_phys >= end)
 236                         free_bootmem(nodedata_phys, pgdat_size);
 237                 node_data[nodeid] = NULL;
 238                 return;
 239         }
 240         bootmap_start = __pa(bootmap);
 241
 242         bootmap_size = init_bootmem_node(NODE_DATA(nodeid),
 243                                          bootmap_start >> PAGE_SHIFT,
 244                                          start_pfn, last_pfn);
 245
 246         printk(KERN_INFO "  bootmap [%016lx -  %016lx] pages %lx\n",
 247                  bootmap_start, bootmap_start + bootmap_size - 1,
 248                  bootmap_pages);
 249
 250         free_bootmem_with_active_regions(nodeid, end);
 251
 252         /*
 253          * convert early reserve to bootmem reserve earlier
 254          * otherwise early_node_mem could use early reserved mem
 255          * on previous node
 256          */
 257         early_res_to_bootmem(start, end);
 258
 259         /*
 260          * in some case early_node_mem could use alloc_bootmem
 261          * to get range on other node, don't reserve that again
 262          */
 263         if (nid != nodeid)
 264                 printk(KERN_INFO "    NODE_DATA(%d) on node %d\n", nodeid, nid);
 265         else
 266                 reserve_bootmem_node(NODE_DATA(nodeid), nodedata_phys,
 267                                         pgdat_size, BOOTMEM_DEFAULT);
 268         nid = phys_to_nid(bootmap_start);
 269         if (nid != nodeid)
 270                 printk(KERN_INFO "    bootmap(%d) on node %d\n", nodeid, nid);
 271         else
 272                 reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start,
 273                                  bootmap_pages<<PAGE_SHIFT, BOOTMEM_DEFAULT);
 274
 275 #ifdef CONFIG_ACPI_NUMA
 276         srat_reserve_add_area(nodeid);
 277 #endif
 278         node_set_online(nodeid);
 279 }
 280
 281 /*
 282  * There are unfortunately some poorly designed mainboards around that
 283  * only connect memory to a single CPU. This breaks the 1:1 cpu->node
 284  * mapping. To avoid this fill in the mapping for all possible CPUs,
 285  * as the number of CPUs is not known yet. We round robin the existing
 286  * nodes.
 287  */
 288 void __init numa_init_array(void)
 289 {
 290         int rr, i;
 291
 292         rr = first_node(node_online_map);
 293         for (i = 0; i < nr_cpu_ids; i++) {
 294                 if (early_cpu_to_node(i) != NUMA_NO_NODE)
 295                         continue;
 296                 numa_set_node(i, rr);
 297                 rr = next_node(rr, node_online_map);
 298                 if (rr == MAX_NUMNODES)
 299                         rr = first_node(node_online_map);
 300         }
 301 }
 302
 303 #ifdef CONFIG_NUMA_EMU
 304 /* Numa emulation */
 305 static char *cmdline __initdata;
 306
 307 /*
 308  * Setups up nid to range from addr to addr + size.  If the end
 309  * boundary is greater than max_addr, then max_addr is used instead.
 310  * The return value is 0 if there is additional memory left for
 311  * allocation past addr and -1 otherwise.  addr is adjusted to be at
 312  * the end of the node.
 313  */
 314 static int __init setup_node_range(int nid, struct bootnode *nodes, u64 *addr,
 315                                    u64 size, u64 max_addr)
 316 {
 317         int ret = 0;
 318
 319         nodes[nid].start = *addr;
 320         *addr += size;
 321         if (*addr >= max_addr) {
 322                 *addr = max_addr;
 323                 ret = -1;
 324         }
 325         nodes[nid].end = *addr;
 326         node_set(nid, node_possible_map);
 327         printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n", nid,
 328                nodes[nid].start, nodes[nid].end,
 329                (nodes[nid].end - nodes[nid].start) >> 20);
 330         return ret;
 331 }
 332
 333 /*
 334  * Splits num_nodes nodes up equally starting at node_start.  The return value
 335  * is the number of nodes split up and addr is adjusted to be at the end of the
 336  * last node allocated.
 337  */
 338 static int __init split_nodes_equally(struct bootnode *nodes, u64 *addr,
 339                                       u64 max_addr, int node_start,
 340                                       int num_nodes)
 341 {
 342         unsigned int big;
 343         u64 size;
 344         int i;
 345
 346         if (num_nodes <= 0)
 347                 return -1;
 348         if (num_nodes > MAX_NUMNODES)
 349                 num_nodes = MAX_NUMNODES;
 350         size = (max_addr - *addr - e820_hole_size(*addr, max_addr)) /
 351                num_nodes;
 352         /*
 353          * Calculate the number of big nodes that can be allocated as a result
 354          * of consolidating the leftovers.
 355          */
 356         big = ((size & ~FAKE_NODE_MIN_HASH_MASK) * num_nodes) /
 357               FAKE_NODE_MIN_SIZE;
 358
 359         /* Round down to nearest FAKE_NODE_MIN_SIZE. */
 360         size &= FAKE_NODE_MIN_HASH_MASK;
 361         if (!size) {
 362                 printk(KERN_ERR "Not enough memory for each node.  "
 363                        "NUMA emulation disabled.\n");
 364                 return -1;
 365         }
 366
 367         for (i = node_start; i < num_nodes + node_start; i++) {
 368                 u64 end = *addr + size;
 369
 370                 if (i < big)
 371                         end += FAKE_NODE_MIN_SIZE;
 372                 /*
 373                  * The final node can have the remaining system RAM.  Other
 374                  * nodes receive roughly the same amount of available pages.
 375                  */
 376                 if (i == num_nodes + node_start - 1)
 377                         end = max_addr;
 378                 else
 379                         while (end - *addr - e820_hole_size(*addr, end) <
 380                                size) {
 381                                 end += FAKE_NODE_MIN_SIZE;
 382                                 if (end > max_addr) {
 383                                         end = max_addr;
 384                                         break;
 385                                 }
 386                         }
 387                 if (setup_node_range(i, nodes, addr, end - *addr, max_addr) < 0)
 388                         break;
 389         }
 390         return i - node_start + 1;
 391 }
 392
 393 /*
 394  * Splits the remaining system RAM into chunks of size.  The remaining memory is
 395  * always assigned to a final node and can be asymmetric.  Returns the number of
 396  * nodes split.
 397  */
 398 static int __init split_nodes_by_size(struct bootnode *nodes, u64 *addr,
 399                                       u64 max_addr, int node_start, u64 size)
 400 {
 401         int i = node_start;
 402         size = (size << 20) & FAKE_NODE_MIN_HASH_MASK;
 403         while (!setup_node_range(i++, nodes, addr, size, max_addr))
 404                 ;
 405         return i - node_start;
 406 }
 407
 408 /*
 409  * Sets up the system RAM area from start_pfn to last_pfn according to the
 410  * numa=fake command-line option.
 411  */
 412 static struct bootnode nodes[MAX_NUMNODES] __initdata;
 413
 414 static int __init numa_emulation(unsigned long start_pfn, unsigned long last_pfn)
 415 {
 416         u64 size, addr = start_pfn << PAGE_SHIFT;
 417         u64 max_addr = last_pfn << PAGE_SHIFT;
 418         int num_nodes = 0, num = 0, coeff_flag, coeff = -1, i;
 419
 420         memset(&nodes, 0, sizeof(nodes));
 421         /*
 422          * If the numa=fake command-line is just a single number N, split the
 423          * system RAM into N fake nodes.
 424          */
 425         if (!strchr(cmdline, '*') && !strchr(cmdline, ',')) {
 426                 long n = simple_strtol(cmdline, NULL, 0);
 427
 428                 num_nodes = split_nodes_equally(nodes, &addr, max_addr, 0, n);
 429                 if (num_nodes < 0)
 430                         return num_nodes;
 431                 goto out;
 432         }
 433
 434         /* Parse the command line. */
 435         for (coeff_flag = 0; ; cmdline++) {
 436                 if (*cmdline && isdigit(*cmdline)) {
 437                         num = num * 10 + *cmdline - '0';
 438                         continue;
 439                 }
 440                 if (*cmdline == '*') {
 441                         if (num > 0)
 442                                 coeff = num;
 443                         coeff_flag = 1;
 444                 }
 445                 if (!*cmdline || *cmdline == ',') {
 446                         if (!coeff_flag)
 447                                 coeff = 1;
 448                         /*
 449                          * Round down to the nearest FAKE_NODE_MIN_SIZE.
 450                          * Command-line coefficients are in megabytes.
 451                          */
 452                         size = ((u64)num << 20) & FAKE_NODE_MIN_HASH_MASK;
 453                         if (size)
 454                                 for (i = 0; i < coeff; i++, num_nodes++)
 455                                         if (setup_node_range(num_nodes, nodes,
 456                                                 &addr, size, max_addr) < 0)
 457                                                 goto done;
 458                         if (!*cmdline)
 459                                 break;
 460                         coeff_flag = 0;
 461                         coeff = -1;
 462                 }
 463                 num = 0;
 464         }
 465 done:
 466         if (!num_nodes)
 467                 return -1;
 468         /* Fill remainder of system RAM, if appropriate. */
 469         if (addr < max_addr) {
 470                 if (coeff_flag && coeff < 0) {
 471                         /* Split remaining nodes into num-sized chunks */
 472                         num_nodes += split_nodes_by_size(nodes, &addr, max_addr,
 473                                                          num_nodes, num);
 474                         goto out;
 475                 }
 476                 switch (*(cmdline - 1)) {
 477                 case '*':
 478                         /* Split remaining nodes into coeff chunks */
 479                         if (coeff <= 0)
 480                                 break;
 481                         num_nodes += split_nodes_equally(nodes, &addr, max_addr,
 482                                                          num_nodes, coeff);
 483                         break;
 484                 case ',':
 485                         /* Do not allocate remaining system RAM */
 486                         break;
 487                 default:
 488                         /* Give one final node */
 489                         setup_node_range(num_nodes, nodes, &addr,
 490                                          max_addr - addr, max_addr);
 491                         num_nodes++;
 492                 }
 493         }
 494 out:
 495         memnode_shift = compute_hash_shift(nodes, num_nodes, NULL);
 496         if (memnode_shift < 0) {
 497                 memnode_shift = 0;
 498                 printk(KERN_ERR "No NUMA hash function found.  NUMA emulation "
 499                        "disabled.\n");
 500                 return -1;
 501         }
 502
 503         /*
 504          * We need to vacate all active ranges that may have been registered by
 505          * SRAT and set acpi_numa to -1 so that srat_disabled() always returns
 506          * true.  NUMA emulation has succeeded so we will not scan ACPI nodes.
 507          */
 508         remove_all_active_ranges();
 509 #ifdef CONFIG_ACPI_NUMA
 510         acpi_numa = -1;
 511 #endif
 512         for_each_node_mask(i, node_possible_map) {
 513                 e820_register_active_regions(i, nodes[i].start >> PAGE_SHIFT,
 514                                                 nodes[i].end >> PAGE_SHIFT);
 515                 setup_node_bootmem(i, nodes[i].start, nodes[i].end);
 516         }
 517         acpi_fake_nodes(nodes, num_nodes);
 518         numa_init_array();
 519         return 0;
 520 }
 521 #endif /* CONFIG_NUMA_EMU */
 522
 523 void __init initmem_init(unsigned long start_pfn, unsigned long last_pfn)
 524 {
 525         int i;
 526
 527         nodes_clear(node_possible_map);
 528         nodes_clear(node_online_map);
 529
 530 #ifdef CONFIG_NUMA_EMU
 531         if (cmdline && !numa_emulation(start_pfn, last_pfn))
 532                 return;
 533         nodes_clear(node_possible_map);
 534         nodes_clear(node_online_map);
 535 #endif
 536
 537 #ifdef CONFIG_ACPI_NUMA
 538         if (!numa_off && !acpi_scan_nodes(start_pfn << PAGE_SHIFT,
 539                                           last_pfn << PAGE_SHIFT))
 540                 return;
 541         nodes_clear(node_possible_map);
 542         nodes_clear(node_online_map);
 543 #endif
 544
 545 #ifdef CONFIG_K8_NUMA
 546         if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT,
 547                                         last_pfn<<PAGE_SHIFT))
 548                 return;
 549         nodes_clear(node_possible_map);
 550         nodes_clear(node_online_map);
 551 #endif
 552         printk(KERN_INFO "%s\n",
 553                numa_off ? "NUMA turned off" : "No NUMA configuration found");
 554
 555         printk(KERN_INFO "Faking a node at %016lx-%016lx\n",
 556                start_pfn << PAGE_SHIFT,
 557                last_pfn << PAGE_SHIFT);
 558         /* setup dummy node covering all memory */
 559         memnode_shift = 63;
 560         memnodemap = memnode.embedded_map;
 561         memnodemap[0] = 0;
 562         node_set_online(0);
 563         node_set(0, node_possible_map);
 564         for (i = 0; i < nr_cpu_ids; i++)
 565                 numa_set_node(i, 0);
 566         e820_register_active_regions(0, start_pfn, last_pfn);
 567         setup_node_bootmem(0, start_pfn << PAGE_SHIFT, last_pfn << PAGE_SHIFT);
 568 }
 569
 570 unsigned long __init numa_free_all_bootmem(void)
 571 {
 572         unsigned long pages = 0;
 573         int i;
 574
 575         for_each_online_node(i)
 576                 pages += free_all_bootmem_node(NODE_DATA(i));
 577
 578         return pages;
 579 }
 580
 581 static __init int numa_setup(char *opt)
 582 {
 583         if (!opt)
 584                 return -EINVAL;
 585         if (!strncmp(opt, "off", 3))
 586                 numa_off = 1;
 587 #ifdef CONFIG_NUMA_EMU
 588         if (!strncmp(opt, "fake=", 5))
 589                 cmdline = opt + 5;
 590 #endif
 591 #ifdef CONFIG_ACPI_NUMA
 592         if (!strncmp(opt, "noacpi", 6))
 593                 acpi_numa = -1;
 594         if (!strncmp(opt, "hotadd=", 7))
 595                 hotadd_percent = simple_strtoul(opt+7, NULL, 10);
 596 #endif
 597         return 0;
 598 }
 599 early_param("numa", numa_setup);
 600
 601 #ifdef CONFIG_NUMA
 602 /*
 603  * Setup early cpu_to_node.
 604  *
 605  * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
 606  * and apicid_to_node[] tables have valid entries for a CPU.
 607  * This means we skip cpu_to_node[] initialisation for NUMA
 608  * emulation and faking node case (when running a kernel compiled
 609  * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
 610  * is already initialized in a round robin manner at numa_init_array,
 611  * prior to this call, and this initialization is good enough
 612  * for the fake NUMA cases.
 613  *
 614  * Called before the per_cpu areas are setup.
 615  */
 616 void __init init_cpu_to_node(void)
 617 {
 618         int cpu;
 619         u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
 620
 621         BUG_ON(cpu_to_apicid == NULL);
 622
 623         for_each_possible_cpu(cpu) {
 624                 int node;
 625                 u16 apicid = cpu_to_apicid[cpu];
 626
 627                 if (apicid == BAD_APICID)
 628                         continue;
 629                 node = apicid_to_node[apicid];
 630                 if (node == NUMA_NO_NODE)
 631                         continue;
 632                 if (!node_online(node))
 633                         continue;
 634                 numa_set_node(cpu, node);
 635         }
 636 }
 637 #endif
 638
 639
 640 void __cpuinit numa_set_node(int cpu, int node)
 641 {
 642         int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
 643
 644         /* early setting, no percpu area yet */
 645         if (cpu_to_node_map) {
 646                 cpu_to_node_map[cpu] = node;
 647                 return;
 648         }
 649
 650 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
 651         if (cpu >= nr_cpu_ids || !cpu_possible(cpu)) {
 652                 printk(KERN_ERR "numa_set_node: invalid cpu# (%d)\n", cpu);
 653                 dump_stack();
 654                 return;
 655         }
 656 #endif
 657         per_cpu(x86_cpu_to_node_map, cpu) = node;
 658
 659         if (node != NUMA_NO_NODE)
 660                 per_cpu(node_number, cpu) = node;
 661 }
 662
 663 void __cpuinit numa_clear_node(int cpu)
 664 {
 665         numa_set_node(cpu, NUMA_NO_NODE);
 666 }
 667
 668 #ifndef CONFIG_DEBUG_PER_CPU_MAPS
 669
 670 void __cpuinit numa_add_cpu(int cpu)
 671 {
 672         cpumask_set_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
 673 }
 674
 675 void __cpuinit numa_remove_cpu(int cpu)
 676 {
 677         cpumask_clear_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
 678 }
 679
 680 #else /* CONFIG_DEBUG_PER_CPU_MAPS */
 681
 682 /*
 683  * --------- debug versions of the numa functions ---------
 684  */
 685 static void __cpuinit numa_set_cpumask(int cpu, int enable)
 686 {
 687         int node = early_cpu_to_node(cpu);
 688         struct cpumask *mask;
 689         char buf[64];
 690
 691         mask = node_to_cpumask_map[node];
 692         if (mask == NULL) {
 693                 printk(KERN_ERR "node_to_cpumask_map[%i] NULL\n", node);
 694                 dump_stack();
 695                 return;
 696         }
 697
 698         if (enable)
 699                 cpumask_set_cpu(cpu, mask);
 700         else
 701                 cpumask_clear_cpu(cpu, mask);
 702
 703         cpulist_scnprintf(buf, sizeof(buf), mask);
 704         printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
 705                 enable ? "numa_add_cpu" : "numa_remove_cpu", cpu, node, buf);
 706 }
 707
 708 void __cpuinit numa_add_cpu(int cpu)
 709 {
 710         numa_set_cpumask(cpu, 1);
 711 }
 712
 713 void __cpuinit numa_remove_cpu(int cpu)
 714 {
 715         numa_set_cpumask(cpu, 0);
 716 }
 717
 718 int cpu_to_node(int cpu)
 719 {
 720         if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
 721                 printk(KERN_WARNING
 722                         "cpu_to_node(%d): usage too early!\n", cpu);
 723                 dump_stack();
 724                 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
 725         }
 726         return per_cpu(x86_cpu_to_node_map, cpu);
 727 }
 728 EXPORT_SYMBOL(cpu_to_node);
 729
 730 /*
 731  * Same function as cpu_to_node() but used if called before the
 732  * per_cpu areas are setup.
 733  */
 734 int early_cpu_to_node(int cpu)
 735 {
 736         if (early_per_cpu_ptr(x86_cpu_to_node_map))
 737                 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
 738
 739         if (!cpu_possible(cpu)) {
 740                 printk(KERN_WARNING
 741                         "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
 742                 dump_stack();
 743                 return NUMA_NO_NODE;
 744         }
 745         return per_cpu(x86_cpu_to_node_map, cpu);
 746 }
 747
 748 /*
 749  * --------- end of debug versions of the numa functions ---------
 750  */
 751
 752 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */