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
 183 setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)
 184 {
 185         unsigned long start_pfn, last_pfn, bootmap_pages, bootmap_size;
 186         const int pgdat_size = roundup(sizeof(pg_data_t), PAGE_SIZE);
 187         unsigned long bootmap_start, nodedata_phys;
 188         void *bootmap;
 189         int nid;
 190
 191         if (!end)
 192                 return;
 193
 194         /*
 195          * Don't confuse VM with a node that doesn't have the
 196          * minimum amount of memory:
 197          */
 198         if (end && (end - start) < NODE_MIN_SIZE)
 199                 return;
 200
 201         start = roundup(start, ZONE_ALIGN);
 202
 203         printk(KERN_INFO "Bootmem setup node %d %016lx-%016lx\n", nodeid,
 204                start, end);
 205
 206         start_pfn = start >> PAGE_SHIFT;
 207         last_pfn = end >> PAGE_SHIFT;
 208
 209         node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size,
 210                                            SMP_CACHE_BYTES);
 211         if (node_data[nodeid] == NULL)
 212                 return;
 213         nodedata_phys = __pa(node_data[nodeid]);
 214         printk(KERN_INFO "  NODE_DATA [%016lx - %016lx]\n", nodedata_phys,
 215                 nodedata_phys + pgdat_size - 1);
 216
 217         memset(NODE_DATA(nodeid), 0, sizeof(pg_data_t));
 218         NODE_DATA(nodeid)->bdata = &bootmem_node_data[nodeid];
 219         NODE_DATA(nodeid)->node_start_pfn = start_pfn;
 220         NODE_DATA(nodeid)->node_spanned_pages = last_pfn - start_pfn;
 221
 222         /*
 223          * Find a place for the bootmem map
 224          * nodedata_phys could be on other nodes by alloc_bootmem,
 225          * so need to sure bootmap_start not to be small, otherwise
 226          * early_node_mem will get that with find_e820_area instead
 227          * of alloc_bootmem, that could clash with reserved range
 228          */
 229         bootmap_pages = bootmem_bootmap_pages(last_pfn - start_pfn);
 230         nid = phys_to_nid(nodedata_phys);
 231         if (nid == nodeid)
 232                 bootmap_start = roundup(nodedata_phys + pgdat_size, PAGE_SIZE);
 233         else
 234                 bootmap_start = roundup(start, PAGE_SIZE);
 235         /*
 236          * SMP_CACHE_BYTES could be enough, but init_bootmem_node like
 237          * to use that to align to PAGE_SIZE
 238          */
 239         bootmap = early_node_mem(nodeid, bootmap_start, end,
 240                                  bootmap_pages<<PAGE_SHIFT, PAGE_SIZE);
 241         if (bootmap == NULL)  {
 242                 if (nodedata_phys < start || nodedata_phys >= end)
 243                         free_bootmem(nodedata_phys, pgdat_size);
 244                 node_data[nodeid] = NULL;
 245                 return;
 246         }
 247         bootmap_start = __pa(bootmap);
 248
 249         bootmap_size = init_bootmem_node(NODE_DATA(nodeid),
 250                                          bootmap_start >> PAGE_SHIFT,
 251                                          start_pfn, last_pfn);
 252
 253         printk(KERN_INFO "  bootmap [%016lx -  %016lx] pages %lx\n",
 254                  bootmap_start, bootmap_start + bootmap_size - 1,
 255                  bootmap_pages);
 256
 257         free_bootmem_with_active_regions(nodeid, end);
 258
 259         /*
 260          * convert early reserve to bootmem reserve earlier
 261          * otherwise early_node_mem could use early reserved mem
 262          * on previous node
 263          */
 264         early_res_to_bootmem(start, end);
 265
 266         /*
 267          * in some case early_node_mem could use alloc_bootmem
 268          * to get range on other node, don't reserve that again
 269          */
 270         if (nid != nodeid)
 271                 printk(KERN_INFO "    NODE_DATA(%d) on node %d\n", nodeid, nid);
 272         else
 273                 reserve_bootmem_node(NODE_DATA(nodeid), nodedata_phys,
 274                                         pgdat_size, BOOTMEM_DEFAULT);
 275         nid = phys_to_nid(bootmap_start);
 276         if (nid != nodeid)
 277                 printk(KERN_INFO "    bootmap(%d) on node %d\n", nodeid, nid);
 278         else
 279                 reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start,
 280                                  bootmap_pages<<PAGE_SHIFT, BOOTMEM_DEFAULT);
 281
 282         node_set_online(nodeid);
 283 }
 284
 285 /*
 286  * There are unfortunately some poorly designed mainboards around that
 287  * only connect memory to a single CPU. This breaks the 1:1 cpu->node
 288  * mapping. To avoid this fill in the mapping for all possible CPUs,
 289  * as the number of CPUs is not known yet. We round robin the existing
 290  * nodes.
 291  */
 292 void __init numa_init_array(void)
 293 {
 294         int rr, i;
 295
 296         rr = first_node(node_online_map);
 297         for (i = 0; i < nr_cpu_ids; i++) {
 298                 if (early_cpu_to_node(i) != NUMA_NO_NODE)
 299                         continue;
 300                 numa_set_node(i, rr);
 301                 rr = next_node(rr, node_online_map);
 302                 if (rr == MAX_NUMNODES)
 303                         rr = first_node(node_online_map);
 304         }
 305 }
 306
 307 #ifdef CONFIG_NUMA_EMU
 308 /* Numa emulation */
 309 static char *cmdline __initdata;
 310
 311 /*
 312  * Setups up nid to range from addr to addr + size.  If the end
 313  * boundary is greater than max_addr, then max_addr is used instead.
 314  * The return value is 0 if there is additional memory left for
 315  * allocation past addr and -1 otherwise.  addr is adjusted to be at
 316  * the end of the node.
 317  */
 318 static int __init setup_node_range(int nid, struct bootnode *nodes, u64 *addr,
 319                                    u64 size, u64 max_addr)
 320 {
 321         int ret = 0;
 322
 323         nodes[nid].start = *addr;
 324         *addr += size;
 325         if (*addr >= max_addr) {
 326                 *addr = max_addr;
 327                 ret = -1;
 328         }
 329         nodes[nid].end = *addr;
 330         node_set(nid, node_possible_map);
 331         printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n", nid,
 332                nodes[nid].start, nodes[nid].end,
 333                (nodes[nid].end - nodes[nid].start) >> 20);
 334         return ret;
 335 }
 336
 337 /*
 338  * Splits num_nodes nodes up equally starting at node_start.  The return value
 339  * is the number of nodes split up and addr is adjusted to be at the end of the
 340  * last node allocated.
 341  */
 342 static int __init split_nodes_equally(struct bootnode *nodes, u64 *addr,
 343                                       u64 max_addr, int node_start,
 344                                       int num_nodes)
 345 {
 346         unsigned int big;
 347         u64 size;
 348         int i;
 349
 350         if (num_nodes <= 0)
 351                 return -1;
 352         if (num_nodes > MAX_NUMNODES)
 353                 num_nodes = MAX_NUMNODES;
 354         size = (max_addr - *addr - e820_hole_size(*addr, max_addr)) /
 355                num_nodes;
 356         /*
 357          * Calculate the number of big nodes that can be allocated as a result
 358          * of consolidating the leftovers.
 359          */
 360         big = ((size & ~FAKE_NODE_MIN_HASH_MASK) * num_nodes) /
 361               FAKE_NODE_MIN_SIZE;
 362
 363         /* Round down to nearest FAKE_NODE_MIN_SIZE. */
 364         size &= FAKE_NODE_MIN_HASH_MASK;
 365         if (!size) {
 366                 printk(KERN_ERR "Not enough memory for each node.  "
 367                        "NUMA emulation disabled.\n");
 368                 return -1;
 369         }
 370
 371         for (i = node_start; i < num_nodes + node_start; i++) {
 372                 u64 end = *addr + size;
 373
 374                 if (i < big)
 375                         end += FAKE_NODE_MIN_SIZE;
 376                 /*
 377                  * The final node can have the remaining system RAM.  Other
 378                  * nodes receive roughly the same amount of available pages.
 379                  */
 380                 if (i == num_nodes + node_start - 1)
 381                         end = max_addr;
 382                 else
 383                         while (end - *addr - e820_hole_size(*addr, end) <
 384                                size) {
 385                                 end += FAKE_NODE_MIN_SIZE;
 386                                 if (end > max_addr) {
 387                                         end = max_addr;
 388                                         break;
 389                                 }
 390                         }
 391                 if (setup_node_range(i, nodes, addr, end - *addr, max_addr) < 0)
 392                         break;
 393         }
 394         return i - node_start + 1;
 395 }
 396
 397 /*
 398  * Splits the remaining system RAM into chunks of size.  The remaining memory is
 399  * always assigned to a final node and can be asymmetric.  Returns the number of
 400  * nodes split.
 401  */
 402 static int __init split_nodes_by_size(struct bootnode *nodes, u64 *addr,
 403                                       u64 max_addr, int node_start, u64 size)
 404 {
 405         int i = node_start;
 406         size = (size << 20) & FAKE_NODE_MIN_HASH_MASK;
 407         while (!setup_node_range(i++, nodes, addr, size, max_addr))
 408                 ;
 409         return i - node_start;
 410 }
 411
 412 /*
 413  * Sets up the system RAM area from start_pfn to last_pfn according to the
 414  * numa=fake command-line option.
 415  */
 416 static struct bootnode nodes[MAX_NUMNODES] __initdata;
 417
 418 static int __init numa_emulation(unsigned long start_pfn, unsigned long last_pfn)
 419 {
 420         u64 size, addr = start_pfn << PAGE_SHIFT;
 421         u64 max_addr = last_pfn << PAGE_SHIFT;
 422         int num_nodes = 0, num = 0, coeff_flag, coeff = -1, i;
 423
 424         memset(&nodes, 0, sizeof(nodes));
 425         /*
 426          * If the numa=fake command-line is just a single number N, split the
 427          * system RAM into N fake nodes.
 428          */
 429         if (!strchr(cmdline, '*') && !strchr(cmdline, ',')) {
 430                 long n = simple_strtol(cmdline, NULL, 0);
 431
 432                 num_nodes = split_nodes_equally(nodes, &addr, max_addr, 0, n);
 433                 if (num_nodes < 0)
 434                         return num_nodes;
 435                 goto out;
 436         }
 437
 438         /* Parse the command line. */
 439         for (coeff_flag = 0; ; cmdline++) {
 440                 if (*cmdline && isdigit(*cmdline)) {
 441                         num = num * 10 + *cmdline - '0';
 442                         continue;
 443                 }
 444                 if (*cmdline == '*') {
 445                         if (num > 0)
 446                                 coeff = num;
 447                         coeff_flag = 1;
 448                 }
 449                 if (!*cmdline || *cmdline == ',') {
 450                         if (!coeff_flag)
 451                                 coeff = 1;
 452                         /*
 453                          * Round down to the nearest FAKE_NODE_MIN_SIZE.
 454                          * Command-line coefficients are in megabytes.
 455                          */
 456                         size = ((u64)num << 20) & FAKE_NODE_MIN_HASH_MASK;
 457                         if (size)
 458                                 for (i = 0; i < coeff; i++, num_nodes++)
 459                                         if (setup_node_range(num_nodes, nodes,
 460                                                 &addr, size, max_addr) < 0)
 461                                                 goto done;
 462                         if (!*cmdline)
 463                                 break;
 464                         coeff_flag = 0;
 465                         coeff = -1;
 466                 }
 467                 num = 0;
 468         }
 469 done:
 470         if (!num_nodes)
 471                 return -1;
 472         /* Fill remainder of system RAM, if appropriate. */
 473         if (addr < max_addr) {
 474                 if (coeff_flag && coeff < 0) {
 475                         /* Split remaining nodes into num-sized chunks */
 476                         num_nodes += split_nodes_by_size(nodes, &addr, max_addr,
 477                                                          num_nodes, num);
 478                         goto out;
 479                 }
 480                 switch (*(cmdline - 1)) {
 481                 case '*':
 482                         /* Split remaining nodes into coeff chunks */
 483                         if (coeff <= 0)
 484                                 break;
 485                         num_nodes += split_nodes_equally(nodes, &addr, max_addr,
 486                                                          num_nodes, coeff);
 487                         break;
 488                 case ',':
 489                         /* Do not allocate remaining system RAM */
 490                         break;
 491                 default:
 492                         /* Give one final node */
 493                         setup_node_range(num_nodes, nodes, &addr,
 494                                          max_addr - addr, max_addr);
 495                         num_nodes++;
 496                 }
 497         }
 498 out:
 499         memnode_shift = compute_hash_shift(nodes, num_nodes, NULL);
 500         if (memnode_shift < 0) {
 501                 memnode_shift = 0;
 502                 printk(KERN_ERR "No NUMA hash function found.  NUMA emulation "
 503                        "disabled.\n");
 504                 return -1;
 505         }
 506
 507         /*
 508          * We need to vacate all active ranges that may have been registered by
 509          * SRAT and set acpi_numa to -1 so that srat_disabled() always returns
 510          * true.  NUMA emulation has succeeded so we will not scan ACPI nodes.
 511          */
 512         remove_all_active_ranges();
 513 #ifdef CONFIG_ACPI_NUMA
 514         acpi_numa = -1;
 515 #endif
 516         for_each_node_mask(i, node_possible_map) {
 517                 e820_register_active_regions(i, nodes[i].start >> PAGE_SHIFT,
 518                                                 nodes[i].end >> PAGE_SHIFT);
 519                 setup_node_bootmem(i, nodes[i].start, nodes[i].end);
 520         }
 521         acpi_fake_nodes(nodes, num_nodes);
 522         numa_init_array();
 523         return 0;
 524 }
 525 #endif /* CONFIG_NUMA_EMU */
 526
 527 void __init initmem_init(unsigned long start_pfn, unsigned long last_pfn)
 528 {
 529         int i;
 530
 531         nodes_clear(node_possible_map);
 532         nodes_clear(node_online_map);
 533
 534 #ifdef CONFIG_NUMA_EMU
 535         if (cmdline && !numa_emulation(start_pfn, last_pfn))
 536                 return;
 537         nodes_clear(node_possible_map);
 538         nodes_clear(node_online_map);
 539 #endif
 540
 541 #ifdef CONFIG_ACPI_NUMA
 542         if (!numa_off && !acpi_scan_nodes(start_pfn << PAGE_SHIFT,
 543                                           last_pfn << PAGE_SHIFT))
 544                 return;
 545         nodes_clear(node_possible_map);
 546         nodes_clear(node_online_map);
 547 #endif
 548
 549 #ifdef CONFIG_K8_NUMA
 550         if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT,
 551                                         last_pfn<<PAGE_SHIFT))
 552                 return;
 553         nodes_clear(node_possible_map);
 554         nodes_clear(node_online_map);
 555 #endif
 556         printk(KERN_INFO "%s\n",
 557                numa_off ? "NUMA turned off" : "No NUMA configuration found");
 558
 559         printk(KERN_INFO "Faking a node at %016lx-%016lx\n",
 560                start_pfn << PAGE_SHIFT,
 561                last_pfn << PAGE_SHIFT);
 562         /* setup dummy node covering all memory */
 563         memnode_shift = 63;
 564         memnodemap = memnode.embedded_map;
 565         memnodemap[0] = 0;
 566         node_set_online(0);
 567         node_set(0, node_possible_map);
 568         for (i = 0; i < nr_cpu_ids; i++)
 569                 numa_set_node(i, 0);
 570         e820_register_active_regions(0, start_pfn, last_pfn);
 571         setup_node_bootmem(0, start_pfn << PAGE_SHIFT, last_pfn << PAGE_SHIFT);
 572 }
 573
 574 unsigned long __init numa_free_all_bootmem(void)
 575 {
 576         unsigned long pages = 0;
 577         int i;
 578
 579         for_each_online_node(i)
 580                 pages += free_all_bootmem_node(NODE_DATA(i));
 581
 582         return pages;
 583 }
 584
 585 static __init int numa_setup(char *opt)
 586 {
 587         if (!opt)
 588                 return -EINVAL;
 589         if (!strncmp(opt, "off", 3))
 590                 numa_off = 1;
 591 #ifdef CONFIG_NUMA_EMU
 592         if (!strncmp(opt, "fake=", 5))
 593                 cmdline = opt + 5;
 594 #endif
 595 #ifdef CONFIG_ACPI_NUMA
 596         if (!strncmp(opt, "noacpi", 6))
 597                 acpi_numa = -1;
 598 #endif
 599         return 0;
 600 }
 601 early_param("numa", numa_setup);
 602
 603 #ifdef CONFIG_NUMA
 604 /*
 605  * Setup early cpu_to_node.
 606  *
 607  * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
 608  * and apicid_to_node[] tables have valid entries for a CPU.
 609  * This means we skip cpu_to_node[] initialisation for NUMA
 610  * emulation and faking node case (when running a kernel compiled
 611  * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
 612  * is already initialized in a round robin manner at numa_init_array,
 613  * prior to this call, and this initialization is good enough
 614  * for the fake NUMA cases.
 615  *
 616  * Called before the per_cpu areas are setup.
 617  */
 618 void __init init_cpu_to_node(void)
 619 {
 620         int cpu;
 621         u16 *cpu_to_apicid = early_per_cpu_ptr(x86_cpu_to_apicid);
 622
 623         BUG_ON(cpu_to_apicid == NULL);
 624
 625         for_each_possible_cpu(cpu) {
 626                 int node;
 627                 u16 apicid = cpu_to_apicid[cpu];
 628
 629                 if (apicid == BAD_APICID)
 630                         continue;
 631                 node = apicid_to_node[apicid];
 632                 if (node == NUMA_NO_NODE)
 633                         continue;
 634                 if (!node_online(node))
 635                         continue;
 636                 numa_set_node(cpu, node);
 637         }
 638 }
 639 #endif
 640
 641
 642 void __cpuinit numa_set_node(int cpu, int node)
 643 {
 644         int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map);
 645
 646         /* early setting, no percpu area yet */
 647         if (cpu_to_node_map) {
 648                 cpu_to_node_map[cpu] = node;
 649                 return;
 650         }
 651
 652 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
 653         if (cpu >= nr_cpu_ids || !cpu_possible(cpu)) {
 654                 printk(KERN_ERR "numa_set_node: invalid cpu# (%d)\n", cpu);
 655                 dump_stack();
 656                 return;
 657         }
 658 #endif
 659         per_cpu(x86_cpu_to_node_map, cpu) = node;
 660
 661         if (node != NUMA_NO_NODE)
 662                 per_cpu(node_number, cpu) = node;
 663 }
 664
 665 void __cpuinit numa_clear_node(int cpu)
 666 {
 667         numa_set_node(cpu, NUMA_NO_NODE);
 668 }
 669
 670 #ifndef CONFIG_DEBUG_PER_CPU_MAPS
 671
 672 void __cpuinit numa_add_cpu(int cpu)
 673 {
 674         cpumask_set_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
 675 }
 676
 677 void __cpuinit numa_remove_cpu(int cpu)
 678 {
 679         cpumask_clear_cpu(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]);
 680 }
 681
 682 #else /* CONFIG_DEBUG_PER_CPU_MAPS */
 683
 684 /*
 685  * --------- debug versions of the numa functions ---------
 686  */
 687 static void __cpuinit numa_set_cpumask(int cpu, int enable)
 688 {
 689         int node = early_cpu_to_node(cpu);
 690         struct cpumask *mask;
 691         char buf[64];
 692
 693         mask = node_to_cpumask_map[node];
 694         if (mask == NULL) {
 695                 printk(KERN_ERR "node_to_cpumask_map[%i] NULL\n", node);
 696                 dump_stack();
 697                 return;
 698         }
 699
 700         if (enable)
 701                 cpumask_set_cpu(cpu, mask);
 702         else
 703                 cpumask_clear_cpu(cpu, mask);
 704
 705         cpulist_scnprintf(buf, sizeof(buf), mask);
 706         printk(KERN_DEBUG "%s cpu %d node %d: mask now %s\n",
 707                 enable ? "numa_add_cpu" : "numa_remove_cpu", cpu, node, buf);
 708 }
 709
 710 void __cpuinit numa_add_cpu(int cpu)
 711 {
 712         numa_set_cpumask(cpu, 1);
 713 }
 714
 715 void __cpuinit numa_remove_cpu(int cpu)
 716 {
 717         numa_set_cpumask(cpu, 0);
 718 }
 719
 720 int cpu_to_node(int cpu)
 721 {
 722         if (early_per_cpu_ptr(x86_cpu_to_node_map)) {
 723                 printk(KERN_WARNING
 724                         "cpu_to_node(%d): usage too early!\n", cpu);
 725                 dump_stack();
 726                 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
 727         }
 728         return per_cpu(x86_cpu_to_node_map, cpu);
 729 }
 730 EXPORT_SYMBOL(cpu_to_node);
 731
 732 /*
 733  * Same function as cpu_to_node() but used if called before the
 734  * per_cpu areas are setup.
 735  */
 736 int early_cpu_to_node(int cpu)
 737 {
 738         if (early_per_cpu_ptr(x86_cpu_to_node_map))
 739                 return early_per_cpu_ptr(x86_cpu_to_node_map)[cpu];
 740
 741         if (!cpu_possible(cpu)) {
 742                 printk(KERN_WARNING
 743                         "early_cpu_to_node(%d): no per_cpu area!\n", cpu);
 744                 dump_stack();
 745                 return NUMA_NO_NODE;
 746         }
 747         return per_cpu(x86_cpu_to_node_map, cpu);
 748 }
 749
 750 /*
 751  * --------- end of debug versions of the numa functions ---------
 752  */
 753
 754 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */