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         NODE_DATA(nodeid)->node_mem_map =
 192                 __alloc_bootmem_core(NODE_DATA(nodeid)->bdata,
 193                                 memmapsize, SMP_CACHE_BYTES,
 194                                 round_down(limit - memmapsize, PAGE_SIZE),
 195                                 limit);
 196
 197         size_zones(zones, holes, start_pfn, end_pfn);
 198         free_area_init_node(nodeid, NODE_DATA(nodeid), zones,
 199                             start_pfn, holes);
 200 }
 201
 202 void __init numa_init_array(void)
 203 {
 204         int rr, i;
 205         /* There are unfortunately some poorly designed mainboards around
 206            that only connect memory to a single CPU. This breaks the 1:1 cpu->node
 207            mapping. To avoid this fill in the mapping for all possible
 208            CPUs, as the number of CPUs is not known yet.
 209            We round robin the existing nodes. */
 210         rr = first_node(node_online_map);
 211         for (i = 0; i < NR_CPUS; i++) {
 212                 if (cpu_to_node[i] != NUMA_NO_NODE)
 213                         continue;
 214                 numa_set_node(i, rr);
 215                 rr = next_node(rr, node_online_map);
 216                 if (rr == MAX_NUMNODES)
 217                         rr = first_node(node_online_map);
 218         }
 219
 220 }
 221
 222 #ifdef CONFIG_NUMA_EMU
 223 int numa_fake __initdata = 0;
 224
 225 /* Numa emulation */
 226 static int numa_emulation(unsigned long start_pfn, unsigned long end_pfn)
 227 {
 228         int i;
 229         struct bootnode nodes[MAX_NUMNODES];
 230         unsigned long sz = ((end_pfn - start_pfn)<<PAGE_SHIFT) / numa_fake;
 231
 232         /* Kludge needed for the hash function */
 233         if (hweight64(sz) > 1) {
 234                 unsigned long x = 1;
 235                 while ((x << 1) < sz)
 236                         x <<= 1;
 237                 if (x < sz/2)
 238                         printk(KERN_ERR "Numa emulation unbalanced. Complain to maintainer\n");
 239                 sz = x;
 240         }
 241
 242         memset(&nodes,0,sizeof(nodes));
 243         for (i = 0; i < numa_fake; i++) {
 244                 nodes[i].start = (start_pfn<<PAGE_SHIFT) + i*sz;
 245                 if (i == numa_fake-1)
 246                         sz = (end_pfn<<PAGE_SHIFT) - nodes[i].start;
 247                 nodes[i].end = nodes[i].start + sz;
 248                 printk(KERN_INFO "Faking node %d at %016Lx-%016Lx (%LuMB)\n",
 249                        i,
 250                        nodes[i].start, nodes[i].end,
 251                        (nodes[i].end - nodes[i].start) >> 20);
 252                 node_set_online(i);
 253         }
 254         memnode_shift = compute_hash_shift(nodes, numa_fake);
 255         if (memnode_shift < 0) {
 256                 memnode_shift = 0;
 257                 printk(KERN_ERR "No NUMA hash function found. Emulation disabled.\n");
 258                 return -1;
 259         }
 260         for_each_online_node(i)
 261                 setup_node_bootmem(i, nodes[i].start, nodes[i].end);
 262         numa_init_array();
 263         return 0;
 264 }
 265 #endif
 266
 267 void __init numa_initmem_init(unsigned long start_pfn, unsigned long end_pfn)
 268 {
 269         int i;
 270
 271 #ifdef CONFIG_NUMA_EMU
 272         if (numa_fake && !numa_emulation(start_pfn, end_pfn))
 273                 return;
 274 #endif
 275
 276 #ifdef CONFIG_ACPI_NUMA
 277         if (!numa_off && !acpi_scan_nodes(start_pfn << PAGE_SHIFT,
 278                                           end_pfn << PAGE_SHIFT))
 279                 return;
 280 #endif
 281
 282 #ifdef CONFIG_K8_NUMA
 283         if (!numa_off && !k8_scan_nodes(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT))
 284                 return;
 285 #endif
 286         printk(KERN_INFO "%s\n",
 287                numa_off ? "NUMA turned off" : "No NUMA configuration found");
 288
 289         printk(KERN_INFO "Faking a node at %016lx-%016lx\n",
 290                start_pfn << PAGE_SHIFT,
 291                end_pfn << PAGE_SHIFT);
 292                 /* setup dummy node covering all memory */
 293         memnode_shift = 63;
 294         memnodemap[0] = 0;
 295         nodes_clear(node_online_map);
 296         node_set_online(0);
 297         for (i = 0; i < NR_CPUS; i++)
 298                 numa_set_node(i, 0);
 299         node_to_cpumask[0] = cpumask_of_cpu(0);
 300         setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT);
 301 }
 302
 303 __cpuinit void numa_add_cpu(int cpu)
 304 {
 305         set_bit(cpu, &node_to_cpumask[cpu_to_node(cpu)]);
 306 }
 307
 308 void __cpuinit numa_set_node(int cpu, int node)
 309 {
 310         cpu_pda(cpu)->nodenumber = node;
 311         cpu_to_node[cpu] = node;
 312 }
 313
 314 unsigned long __init numa_free_all_bootmem(void)
 315 {
 316         int i;
 317         unsigned long pages = 0;
 318         for_each_online_node(i) {
 319                 pages += free_all_bootmem_node(NODE_DATA(i));
 320         }
 321         return pages;
 322 }
 323
 324 #ifdef CONFIG_SPARSEMEM
 325 static void __init arch_sparse_init(void)
 326 {
 327         int i;
 328
 329         for_each_online_node(i)
 330                 memory_present(i, node_start_pfn(i), node_end_pfn(i));
 331
 332         sparse_init();
 333 }
 334 #else
 335 #define arch_sparse_init() do {} while (0)
 336 #endif
 337
 338 void __init paging_init(void)
 339 {
 340         int i;
 341
 342         arch_sparse_init();
 343
 344         for_each_online_node(i) {
 345                 setup_node_zones(i);
 346         }
 347 }
 348
 349 /* [numa=off] */
 350 __init int numa_setup(char *opt)
 351 {
 352         if (!strncmp(opt,"off",3))
 353                 numa_off = 1;
 354 #ifdef CONFIG_NUMA_EMU
 355         if(!strncmp(opt, "fake=", 5)) {
 356                 numa_fake = simple_strtoul(opt+5,NULL,0); ;
 357                 if (numa_fake >= MAX_NUMNODES)
 358                         numa_fake = MAX_NUMNODES;
 359         }
 360 #endif
 361 #ifdef CONFIG_ACPI_NUMA
 362         if (!strncmp(opt,"noacpi",6))
 363                 acpi_numa = -1;
 364         if (!strncmp(opt,"hotadd=", 7))
 365                 hotadd_percent = simple_strtoul(opt+7, NULL, 10);
 366 #endif
 367         return 1;
 368 }
 369
 370 /*
 371  * Setup early cpu_to_node.
 372  *
 373  * Populate cpu_to_node[] only if x86_cpu_to_apicid[],
 374  * and apicid_to_node[] tables have valid entries for a CPU.
 375  * This means we skip cpu_to_node[] initialisation for NUMA
 376  * emulation and faking node case (when running a kernel compiled
 377  * for NUMA on a non NUMA box), which is OK as cpu_to_node[]
 378  * is already initialized in a round robin manner at numa_init_array,
 379  * prior to this call, and this initialization is good enough
 380  * for the fake NUMA cases.
 381  */
 382 void __init init_cpu_to_node(void)
 383 {
 384         int i;
 385         for (i = 0; i < NR_CPUS; i++) {
 386                 u8 apicid = x86_cpu_to_apicid[i];
 387                 if (apicid == BAD_APICID)
 388                         continue;
 389                 if (apicid_to_node[apicid] == NUMA_NO_NODE)
 390                         continue;
 391                 numa_set_node(i,apicid_to_node[apicid]);
 392         }
 393 }
 394
 395 EXPORT_SYMBOL(cpu_to_node);
 396 EXPORT_SYMBOL(node_to_cpumask);
 397 EXPORT_SYMBOL(memnode);
 398 EXPORT_SYMBOL(node_data);
 399
 400 #ifdef CONFIG_DISCONTIGMEM
 401 /*
 402  * Functions to convert PFNs from/to per node page addresses.
 403  * These are out of line because they are quite big.
 404  * They could be all tuned by pre caching more state.
 405  * Should do that.
 406  */
 407
 408 int pfn_valid(unsigned long pfn)
 409 {
 410         unsigned nid;
 411         if (pfn >= num_physpages)
 412                 return 0;
 413         nid = pfn_to_nid(pfn);
 414         if (nid == 0xff)
 415                 return 0;
 416         return pfn >= node_start_pfn(nid) && (pfn) < node_end_pfn(nid);
 417 }
 418 EXPORT_SYMBOL(pfn_valid);
 419 #endif