arch/x86_64/mm/numa.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
  15 #include <asm/e820.h>
  16 #include <asm/proto.h>
  17 #include <asm/dma.h>
  18 #include <asm/numa.h>
  19 #include <asm/acpi.h>
  20
  21 #ifndef Dprintk
  22 #define Dprintk(x...)
  23 #endif
  24
  25 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  26 bootmem_data_t plat_node_bdata[MAX_NUMNODES];
  27
  28 struct memnode memnode;
  29
  30 unsigned char cpu_to_node[NR_CPUS] __read_mostly = {
  31         [0 ... NR_CPUS-1] = NUMA_NO_NODE
  32 };
  33 unsigned char apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
  34         [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
  35 };
  36 cpumask_t node_to_cpumask[MAX_NUMNODES] __read_mostly;
  37
  38 int numa_off __initdata;
  39
  40
  41 /*
  42  * Given a shift value, try to populate memnodemap[]
  43  * Returns :
  44  * 1 if OK
  45  * 0 if memnodmap[] too small (of shift too small)
  46  * -1 if node overlap or lost ram (shift too big)
  47  */
  48 static int __init
  49 populate_memnodemap(const struct bootnode *nodes, int numnodes, int shift)
  50 {
  51         int i;
  52         int res = -1;
  53         unsigned long addr, end;
  54
  55         if (shift >= 64)
  56                 return -1;
  57         memset(memnodemap, 0xff, sizeof(memnodemap));
  58         for (i = 0; i < numnodes; i++) {
  59                 addr = nodes[i].start;
  60                 end = nodes[i].end;
  61                 if (addr >= end)
  62                         continue;
  63                 if ((end >> shift) >= NODEMAPSIZE)
  64                         return 0;
  65                 do {
  66                         if (memnodemap[addr >> shift] != 0xff)
  67                                 return -1;
  68                         memnodemap[addr >> shift] = i;
  69                        addr += (1UL << shift);
  70                 } while (addr < end);
  71                 res = 1;
  72         }
  73         return res;
  74 }
  75
  76 int __init compute_hash_shift(struct bootnode *nodes, int numnodes)
  77 {
  78         int shift = 20;
  79
  80         while (populate_memnodemap(nodes, numnodes, shift + 1) >= 0)
  81                 shift++;
  82
  83         printk(KERN_DEBUG "NUMA: Using %d for the hash shift.\n",
  84                 shift);
  85
  86         if (populate_memnodemap(nodes, numnodes, shift) != 1) {
  87                 printk(KERN_INFO
  88         "Your memory is not aligned you need to rebuild your kernel "
  89         "with a bigger NODEMAPSIZE shift=%d\n",
  90                         shift);
  91                 return -1;
  92         }
  93         return shift;
  94 }
  95
  96 #ifdef CONFIG_SPARSEMEM
  97 int early_pfn_to_nid(unsigned long pfn)
  98 {
  99         return phys_to_nid(pfn << PAGE_SHIFT);
 100 }
 101 #endif
 102
 103 static void * __init
 104 early_node_mem(int nodeid, unsigned long start, unsigned long end,
 105               unsigned long size)
 106 {
 107         unsigned long mem = find_e820_area(start, end, size);
 108         void *ptr;
 109         if (mem != -1L)
 110                 return __va(mem);
 111         ptr = __alloc_bootmem_nopanic(size,
 112                                 SMP_CACHE_BYTES, __pa(MAX_DMA_ADDRESS));
 113         if (ptr == 0) {
 114                 printk(KERN_ERR "Cannot find %lu bytes in node %d\n",
 115                         size, nodeid);
 116                 return NULL;
 117         }
 118         return ptr;
 119 }
 120
 121 /* Initialize bootmem allocator for a node */
 122 void __init setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)
 123 {
 124         unsigned long start_pfn, end_pfn, bootmap_pages, bootmap_size, bootmap_start;
 125         unsigned long nodedata_phys;
 126         void *bootmap;
 127         const int pgdat_size = round_up(sizeof(pg_data_t), PAGE_SIZE);
 128
 129         start = round_up(start, ZONE_ALIGN);
 130
 131         printk(KERN_INFO "Bootmem setup node %d %016lx-%016lx\n", nodeid, start, end);
 132
 133         start_pfn = start >> PAGE_SHIFT;
 134         end_pfn = end >> PAGE_SHIFT;
 135
 136         node_data[nodeid] = early_node_mem(nodeid, start, end, pgdat_size);
 137         if (node_data[nodeid] == NULL)
 138                 return;
 139         nodedata_phys = __pa(node_data[nodeid]);
 140
 141         memset(NODE_DATA(nodeid), 0, sizeof(pg_data_t));
 142         NODE_DATA(nodeid)->bdata = &plat_node_bdata[nodeid];
 143         NODE_DATA(nodeid)->node_start_pfn = start_pfn;
 144         NODE_DATA(nodeid)->node_spanned_pages = end_pfn - start_pfn;
 145
 146         /* Find a place for the bootmem map */
 147         bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
 148         bootmap_start = round_up(nodedata_phys + pgdat_size, PAGE_SIZE);
 149         bootmap = early_node_mem(nodeid, bootmap_start, end,
 150                                         bootmap_pages<<PAGE_SHIFT);
 151         if (bootmap == NULL)  {
 152                 if (nodedata_phys < start || nodedata_phys >= end)
 153                         free_bootmem((unsigned long)node_data[nodeid],pgdat_size);
 154                 node_data[nodeid] = NULL;
 155                 return;
 156         }
 157         bootmap_start = __pa(bootmap);
 158         Dprintk("bootmap start %lu pages %lu\n", bootmap_start, bootmap_pages);
 159
 160         bootmap_size = init_bootmem_node(NODE_DATA(nodeid),
 161                                          bootmap_start >> PAGE_SHIFT,
 162                                          start_pfn, end_pfn);
 163
 164         e820_bootmem_free(NODE_DATA(nodeid), start, end);
 165
 166         reserve_bootmem_node(NODE_DATA(nodeid), nodedata_phys, pgdat_size);
 167         reserve_bootmem_node(NODE_DATA(nodeid), bootmap_start, bootmap_pages<<PAGE_SHIFT);
 168 #ifdef CONFIG_ACPI_NUMA
 169         srat_reserve_add_area(nodeid);
 170 #endif
 171         node_set_online(nodeid);
 172 }
 173
 174 /* Initialize final allocator for a zone */
 175 void __init setup_node_zones(int nodeid)
 176 {
 177         unsigned long start_pfn, end_pfn, memmapsize, limit;
 178         unsigned long zones[MAX_NR_ZONES];
 179         unsigned long holes[MAX_NR_ZONES];
 180
 181         start_pfn = node_start_pfn(nodeid);
 182         end_pfn = node_end_pfn(nodeid);
 183
 184         Dprintk(KERN_INFO "Setting up node %d %lx-%lx\n",
 185                 nodeid, start_pfn, end_pfn);
 186
 187         /* Try to allocate mem_map at end to not fill up precious <4GB
 188            memory. */
 189         memmapsize = sizeof(struct page) * (end_pfn-start_pfn);
 190         limit = end_pfn << PAGE_SHIFT;
 191 #ifdef CONFIG_FLAT_NODE_MEM_MAP
 192         NODE_DATA(nodeid)->node_mem_map =
 193                 __alloc_bootmem_core(NODE_DATA(nodeid)->bdata,
 194                                 memmapsize, SMP_CACHE_BYTES,
 195                                 round_down(limit - memmapsize, PAGE_SIZE),
 196                                 limit);
 197 #endif
 198
 199         size_zones(zones, holes, start_pfn, end_pfn);
 200         free_area_init_node(nodeid, NODE_DATA(nodeid), zones,
 201                             start_pfn, holes);
 202 }
 203
 204 void __init numa_init_array(void)
 205 {
 206         int rr, i;
 207         /* There are unfortunately some poorly designed mainboards around
 208            that only connect memory to a single CPU. This breaks the 1:1 cpu->node
 209            mapping. To avoid this fill in the mapping for all possible
 210            CPUs, as the number of CPUs is not known yet.
 211            We round robin the existing nodes. */
 212         rr = first_node(node_online_map);
 213         for (i = 0; i < NR_CPUS; i++) {
 214                 if (cpu_to_node[i] != NUMA_NO_NODE)
 215                         continue;
 216                 numa_set_node(i, rr);
 217                 rr = next_node(rr, node_online_map);
 218                 if (rr == MAX_NUMNODES)
 219                         rr = first_node(node_online_map);
 220         }
 221
 222 }
 223
 224 #ifdef CONFIG_NUMA_EMU
 225 int numa_fake __initdata = 0;
 226
 227 /* Numa emulation */
 228 static int numa_emulation(unsigned long start_pfn, unsigned long end_pfn)
 229 {
 230         int i;
 231         struct bootnode nodes[MAX_NUMNODES];
 232         unsigned long sz = ((end_pfn - start_pfn)<<PAGE_SHIFT) / numa_fake;
 233
 234         /* Kludge needed for the hash function */
 235         if (hweight64(sz) > 1) {
 236                 unsigned long x = 1;
 237                 while ((x << 1) < sz)
 238                         x <<= 1;
 239                 if (x < sz/2)
 240                         printk(KERN_ERR "Numa emulation unbalanced. Complain to maintainer\n");
 241                 sz = x;
 242         }
 243
 244         memset(&nodes,0,sizeof(nodes));
 245         for (i = 0; i < numa_fake; i++) {
 246                 nodes[i].start = (start_pfn<<PAGE_SHIFT) + i*sz;
 247                 if (i == numa_fake-1)
 248                         sz = (end_pfn<<PAGE_SHIFT) - nodes[i].start;
 249                 nodes[i].end = nodes[i].start + sz;
 250                 printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n",
 251                        i,
 252                        nodes[i].start, nodes[i].end,
 253                        (nodes[i].end - nodes[i].start) >> 20);
 254                 node_set_online(i);
 255         }
 256         memnode_shift = compute_hash_shift(nodes, numa_fake);
 257         if (memnode_shift < 0) {
 258                 memnode_shift = 0;
 259                 printk(KERN_ERR "No NUMA hash function found. Emulation disabled.\n");
 260                 return -1;
 261         }
 262         for_each_online_node(i)
 263                 setup_node_bootmem(i, nodes[i].start, nodes[i].end);
 264         numa_init_array();
 265         return 0;
 266 }
 267 #endif
 268
 269 void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
 270 {
 271         int i;
 272
 273 #ifdef CONFIG_NUMA_EMU
 274         if (numa_fake && !numa_emulation(start_pfn, end_pfn))
 275                 return;
 276 #endif
 277
 278 #ifdef CONFIG_ACPI_NUMA
 279         if (!numa_off && !acpi_scan_nodes(start_pfn << PAGE_SHIFT,
 280                                           end_pfn << PAGE_SHIFT))
 281                 return;
 282 #endif
 283
 284 #ifdef CONFIG_K8_NUMA
 285         if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT))
 286                 return;
 287 #endif
 288         printk(KERN_INFO "%s\n",
 289                numa_off ? "NUMA turned off" : "No NUMA configuration found");
 290
 291         printk(KERN_INFO "Faking a node at %016lx-%016lx\n",
 292                start_pfn << PAGE_SHIFT,
 293                end_pfn << PAGE_SHIFT);
 294                 /* setup dummy node covering all memory */
 295         memnode_shift = 63;
 296         memnodemap[0] = 0;
 297         nodes_clear(node_online_map);
 298         node_set_online(0);
 299         for (i = 0; i < NR_CPUS; i++)
 300                 numa_set_node(i, 0);
 301         node_to_cpumask[0] = cpumask_of_cpu(0);
 302         setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
 303 }
 304
 305 __cpuinit void numa_add_cpu(int cpu)
 306 {
 307         set_bit(cpu, &node_to_cpumask[cpu_to_node(cpu)]);
 308 }
 309
 310 void __cpuinit numa_set_node(int cpu, int node)
 311 {
 312         cpu_pda(cpu)->nodenumber = node;
 313         cpu_to_node[cpu] = node;
 314 }
 315
 316 unsigned long __init numa_free_all_bootmem(void)
 317 {
 318         int i;
 319         unsigned long pages = 0;
 320         for_each_online_node(i) {
 321                 pages += free_all_bootmem_node(NODE_DATA(i));
 322         }
 323         return pages;
 324 }
 325
 326 #ifdef CONFIG_SPARSEMEM
 327 static void __init arch_sparse_init(void)
 328 {
 329         int i;
 330
 331         for_each_online_node(i)
 332                 memory_present(i, node_start_pfn(i), node_end_pfn(i));
 333
 334         sparse_init();
 335 }
 336 #else
 337 #define arch_sparse_init() do {} while (0)
 338 #endif
 339
 340 void __init paging_init(void)
 341 {
 342         int i;
 343
 344         arch_sparse_init();
 345
 346         for_each_online_node(i) {
 347                 setup_node_zones(i);
 348         }
 349 }
 350
 351 /* [numa=off] */
 352 __init int numa_setup(char *opt)
 353 {
 354         if (!strncmp(opt,"off",3))
 355                 numa_off = 1;
 356 #ifdef CONFIG_NUMA_EMU
 357         if(!strncmp(opt, "fake=", 5)) {
 358                 numa_fake = simple_strtoul(opt+5,NULL,0); ;
 359                 if (numa_fake >= MAX_NUMNODES)
 360                         numa_fake = MAX_NUMNODES;
 361         }
 362 #endif
 363 #ifdef CONFIG_ACPI_NUMA
 364         if (!strncmp(opt,"noacpi",6))
 365                 acpi_numa = -1;
 366         if (!strncmp(opt,"hotadd=", 7))
 367                 hotadd_percent = simple_strtoul(opt+7, NULL, 10);
 368 #endif
 369         return 1;
 370 }
 371
 372 /*
 373  * Setup early cpu_to_node.
 374  *
 375  * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
 376  * and apicid_to_node[] tables have valid entries for a CPU.
 377  * This means we skip cpu_to_node[] initialisation for NUMA
 378  * emulation and faking node case (when running a kernel compiled
 379  * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
 380  * is already initialized in a round robin manner at numa_init_array,
 381  * prior to this call, and this initialization is good enough
 382  * for the fake NUMA cases.
 383  */
 384 void __init init_cpu_to_node(void)
 385 {
 386         int i;
 387         for (i = 0; i < NR_CPUS; i++) {
 388                 u8 apicid = x86_cpu_to_apicid[i];
 389                 if (apicid == BAD_APICID)
 390                         continue;
 391                 if (apicid_to_node[apicid] == NUMA_NO_NODE)
 392                         continue;
 393                 numa_set_node(i,apicid_to_node[apicid]);
 394         }
 395 }
 396
 397 EXPORT_SYMBOL(cpu_to_node);
 398 EXPORT_SYMBOL(node_to_cpumask);
 399 EXPORT_SYMBOL(memnode);
 400 EXPORT_SYMBOL(node_data);
 401
 402 #ifdef CONFIG_DISCONTIGMEM
 403 /*
 404  * Functions to convert PFNs from/to per node page addresses.
 405  * These are out of line because they are quite big.
 406  * They could be all tuned by pre caching more state.
 407  * Should do that.
 408  */
 409
 410 int pfn_valid(unsigned long pfn)
 411 {
 412         unsigned nid;
 413         if (pfn >= num_physpages)
 414                 return 0;
 415         nid = pfn_to_nid(pfn);
 416         if (nid == 0xff)
 417                 return 0;
 418         return pfn >= node_start_pfn(nid) && (pfn) < node_end_pfn(nid);
 419 }
 420 EXPORT_SYMBOL(pfn_valid);
 421 #endif