arch/i386/mm/discontig.c

   1 /*
   2  * Written by: Patricia Gaughen <gone@us.ibm.com>, IBM Corporation
   3  * August 2002: added remote node KVA remap - Martin J. Bligh
   4  *
   5  * Copyright (C) 2002, IBM Corp.
   6  *
   7  * All rights reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  17  * NON INFRINGEMENT.  See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  */
  24
  25 #include <linux/config.h>
  26 #include <linux/mm.h>
  27 #include <linux/bootmem.h>
  28 #include <linux/mmzone.h>
  29 #include <linux/highmem.h>
  30 #include <linux/initrd.h>
  31 #include <linux/nodemask.h>
  32 #include <asm/e820.h>
  33 #include <asm/setup.h>
  34 #include <asm/mmzone.h>
  35 #include <bios_ebda.h>
  36
  37 struct pglist_data *node_data[MAX_NUMNODES];
  38 bootmem_data_t node0_bdata;
  39
  40 /*
  41  * numa interface - we expect the numa architecture specfic code to have
  42  *                  populated the following initialisation.
  43  *
  44  * 1) node_online_map  - the map of all nodes configured (online) in the system
  45  * 2) physnode_map     - the mapping between a pfn and owning node
  46  * 3) node_start_pfn   - the starting page frame number for a node
  47  * 3) node_end_pfn     - the ending page fram number for a node
  48  */
  49
  50 /*
  51  * physnode_map keeps track of the physical memory layout of a generic
  52  * numa node on a 256Mb break (each element of the array will
  53  * represent 256Mb of memory and will be marked by the node id.  so,
  54  * if the first gig is on node 0, and the second gig is on node 1
  55  * physnode_map will contain:
  56  *
  57  *     physnode_map[0-3] = 0;
  58  *     physnode_map[4-7] = 1;
  59  *     physnode_map[8- ] = -1;
  60  */
  61 s8 physnode_map[MAX_ELEMENTS] = { [0 ... (MAX_ELEMENTS - 1)] = -1};
  62
  63 void memory_present(int nid, unsigned long start, unsigned long end)
  64 {
  65         unsigned long pfn;
  66
  67         printk(KERN_INFO "Node: %d, start_pfn: %ld, end_pfn: %ld\n",
  68                         nid, start, end);
  69         printk(KERN_DEBUG "  Setting physnode_map array to node %d for pfns:\n", nid);
  70         printk(KERN_DEBUG "  ");
  71         for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) {
  72                 physnode_map[pfn / PAGES_PER_ELEMENT] = nid;
  73                 printk("%ld ", pfn);
  74         }
  75         printk("\n");
  76 }
  77
  78 unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
  79                                               unsigned long end_pfn)
  80 {
  81         unsigned long nr_pages = end_pfn - start_pfn;
  82
  83         if (!nr_pages)
  84                 return 0;
  85
  86         return (nr_pages + 1) * sizeof(struct page);
  87 }
  88
  89 unsigned long node_start_pfn[MAX_NUMNODES];
  90 unsigned long node_end_pfn[MAX_NUMNODES];
  91
  92 extern unsigned long find_max_low_pfn(void);
  93 extern void find_max_pfn(void);
  94 extern void one_highpage_init(struct page *, int, int);
  95
  96 extern struct e820map e820;
  97 extern unsigned long init_pg_tables_end;
  98 extern unsigned long highend_pfn, highstart_pfn;
  99 extern unsigned long max_low_pfn;
 100 extern unsigned long totalram_pages;
 101 extern unsigned long totalhigh_pages;
 102
 103 #define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE)
 104
 105 unsigned long node_remap_start_pfn[MAX_NUMNODES];
 106 unsigned long node_remap_size[MAX_NUMNODES];
 107 unsigned long node_remap_offset[MAX_NUMNODES];
 108 void *node_remap_start_vaddr[MAX_NUMNODES];
 109 void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
 110
 111 /*
 112  * FLAT - support for basic PC memory model with discontig enabled, essentially
 113  *        a single node with all available processors in it with a flat
 114  *        memory map.
 115  */
 116 int __init get_memcfg_numa_flat(void)
 117 {
 118         printk("NUMA - single node, flat memory mode\n");
 119
 120         /* Run the memory configuration and find the top of memory. */
 121         find_max_pfn();
 122         node_start_pfn[0] = 0;
 123         node_end_pfn[0] = max_pfn;
 124         memory_present(0, 0, max_pfn);
 125
 126         /* Indicate there is one node available. */
 127         nodes_clear(node_online_map);
 128         node_set_online(0);
 129         return 1;
 130 }
 131
 132 /*
 133  * Find the highest page frame number we have available for the node
 134  */
 135 static void __init find_max_pfn_node(int nid)
 136 {
 137         if (node_end_pfn[nid] > max_pfn)
 138                 node_end_pfn[nid] = max_pfn;
 139         /*
 140          * if a user has given mem=XXXX, then we need to make sure
 141          * that the node _starts_ before that, too, not just ends
 142          */
 143         if (node_start_pfn[nid] > max_pfn)
 144                 node_start_pfn[nid] = max_pfn;
 145         if (node_start_pfn[nid] > node_end_pfn[nid])
 146                 BUG();
 147 }
 148
 149 /* Find the owning node for a pfn. */
 150 int early_pfn_to_nid(unsigned long pfn)
 151 {
 152         int nid;
 153
 154         for_each_node(nid) {
 155                 if (node_end_pfn[nid] == 0)
 156                         break;
 157                 if (node_start_pfn[nid] <= pfn && node_end_pfn[nid] >= pfn)
 158                         return nid;
 159         }
 160
 161         return 0;
 162 }
 163
 164 /*
 165  * Allocate memory for the pg_data_t for this node via a crude pre-bootmem
 166  * method.  For node zero take this from the bottom of memory, for
 167  * subsequent nodes place them at node_remap_start_vaddr which contains
 168  * node local data in physically node local memory.  See setup_memory()
 169  * for details.
 170  */
 171 static void __init allocate_pgdat(int nid)
 172 {
 173         if (nid && node_has_online_mem(nid))
 174                 NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
 175         else {
 176                 NODE_DATA(nid) = (pg_data_t *)(__va(min_low_pfn << PAGE_SHIFT));
 177                 min_low_pfn += PFN_UP(sizeof(pg_data_t));
 178         }
 179 }
 180
 181 void __init remap_numa_kva(void)
 182 {
 183         void *vaddr;
 184         unsigned long pfn;
 185         int node;
 186
 187         for_each_online_node(node) {
 188                 if (node == 0)
 189                         continue;
 190                 for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) {
 191                         vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT);
 192                         set_pmd_pfn((ulong) vaddr,
 193                                 node_remap_start_pfn[node] + pfn,
 194                                 PAGE_KERNEL_LARGE);
 195                 }
 196         }
 197 }
 198
 199 static unsigned long calculate_numa_remap_pages(void)
 200 {
 201         int nid;
 202         unsigned long size, reserve_pages = 0;
 203
 204         for_each_online_node(nid) {
 205                 if (nid == 0)
 206                         continue;
 207                 if (!node_remap_size[nid])
 208                         continue;
 209
 210                 /*
 211                  * The acpi/srat node info can show hot-add memroy zones
 212                  * where memory could be added but not currently present.
 213                  */
 214                 if (node_start_pfn[nid] > max_pfn)
 215                         continue;
 216                 if (node_end_pfn[nid] > max_pfn)
 217                         node_end_pfn[nid] = max_pfn;
 218
 219                 /* ensure the remap includes space for the pgdat. */
 220                 size = node_remap_size[nid] + sizeof(pg_data_t);
 221
 222                 /* convert size to large (pmd size) pages, rounding up */
 223                 size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES;
 224                 /* now the roundup is correct, convert to PAGE_SIZE pages */
 225                 size = size * PTRS_PER_PTE;
 226                 printk("Reserving %ld pages of KVA for lmem_map of node %d\n",
 227                                 size, nid);
 228                 node_remap_size[nid] = size;
 229                 reserve_pages += size;
 230                 node_remap_offset[nid] = reserve_pages;
 231                 printk("Shrinking node %d from %ld pages to %ld pages\n",
 232                         nid, node_end_pfn[nid], node_end_pfn[nid] - size);
 233                 node_end_pfn[nid] -= size;
 234                 node_remap_start_pfn[nid] = node_end_pfn[nid];
 235         }
 236         printk("Reserving total of %ld pages for numa KVA remap\n",
 237                         reserve_pages);
 238         return reserve_pages;
 239 }
 240
 241 extern void setup_bootmem_allocator(void);
 242 unsigned long __init setup_memory(void)
 243 {
 244         int nid;
 245         unsigned long system_start_pfn, system_max_low_pfn;
 246         unsigned long reserve_pages;
 247
 248         /*
 249          * When mapping a NUMA machine we allocate the node_mem_map arrays
 250          * from node local memory.  They are then mapped directly into KVA
 251          * between zone normal and vmalloc space.  Calculate the size of
 252          * this space and use it to adjust the boundry between ZONE_NORMAL
 253          * and ZONE_HIGHMEM.
 254          */
 255         find_max_pfn();
 256         get_memcfg_numa();
 257
 258         reserve_pages = calculate_numa_remap_pages();
 259
 260         /* partially used pages are not usable - thus round upwards */
 261         system_start_pfn = min_low_pfn = PFN_UP(init_pg_tables_end);
 262
 263         system_max_low_pfn = max_low_pfn = find_max_low_pfn() - reserve_pages;
 264         printk("reserve_pages = %ld find_max_low_pfn() ~ %ld\n",
 265                         reserve_pages, max_low_pfn + reserve_pages);
 266         printk("max_pfn = %ld\n", max_pfn);
 267 #ifdef CONFIG_HIGHMEM
 268         highstart_pfn = highend_pfn = max_pfn;
 269         if (max_pfn > system_max_low_pfn)
 270                 highstart_pfn = system_max_low_pfn;
 271         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 272                pages_to_mb(highend_pfn - highstart_pfn));
 273 #endif
 274         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 275                         pages_to_mb(system_max_low_pfn));
 276         printk("min_low_pfn = %ld, max_low_pfn = %ld, highstart_pfn = %ld\n",
 277                         min_low_pfn, max_low_pfn, highstart_pfn);
 278
 279         printk("Low memory ends at vaddr %08lx\n",
 280                         (ulong) pfn_to_kaddr(max_low_pfn));
 281         for_each_online_node(nid) {
 282                 node_remap_start_vaddr[nid] = pfn_to_kaddr(
 283                         (highstart_pfn + reserve_pages) - node_remap_offset[nid]);
 284                 allocate_pgdat(nid);
 285                 printk ("node %d will remap to vaddr %08lx - %08lx\n", nid,
 286                         (ulong) node_remap_start_vaddr[nid],
 287                         (ulong) pfn_to_kaddr(highstart_pfn + reserve_pages
 288                             - node_remap_offset[nid] + node_remap_size[nid]));
 289         }
 290         printk("High memory starts at vaddr %08lx\n",
 291                         (ulong) pfn_to_kaddr(highstart_pfn));
 292         vmalloc_earlyreserve = reserve_pages * PAGE_SIZE;
 293         for_each_online_node(nid)
 294                 find_max_pfn_node(nid);
 295
 296         memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
 297         NODE_DATA(0)->bdata = &node0_bdata;
 298         setup_bootmem_allocator();
 299         return max_low_pfn;
 300 }
 301
 302 void __init zone_sizes_init(void)
 303 {
 304         int nid;
 305
 306         /*
 307          * Insert nodes into pgdat_list backward so they appear in order.
 308          * Clobber node 0's links and NULL out pgdat_list before starting.
 309          */
 310         pgdat_list = NULL;
 311         for (nid = MAX_NUMNODES - 1; nid >= 0; nid--) {
 312                 if (!node_online(nid))
 313                         continue;
 314                 NODE_DATA(nid)->pgdat_next = pgdat_list;
 315                 pgdat_list = NODE_DATA(nid);
 316         }
 317
 318         for_each_online_node(nid) {
 319                 unsigned long zones_size[MAX_NR_ZONES] = {0, 0, 0};
 320                 unsigned long *zholes_size;
 321                 unsigned int max_dma;
 322
 323                 unsigned long low = max_low_pfn;
 324                 unsigned long start = node_start_pfn[nid];
 325                 unsigned long high = node_end_pfn[nid];
 326
 327                 max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 328
 329                 if (node_has_online_mem(nid)){
 330                         if (start > low) {
 331 #ifdef CONFIG_HIGHMEM
 332                                 BUG_ON(start > high);
 333                                 zones_size[ZONE_HIGHMEM] = high - start;
 334 #endif
 335                         } else {
 336                                 if (low < max_dma)
 337                                         zones_size[ZONE_DMA] = low;
 338                                 else {
 339                                         BUG_ON(max_dma > low);
 340                                         BUG_ON(low > high);
 341                                         zones_size[ZONE_DMA] = max_dma;
 342                                         zones_size[ZONE_NORMAL] = low - max_dma;
 343 #ifdef CONFIG_HIGHMEM
 344                                         zones_size[ZONE_HIGHMEM] = high - low;
 345 #endif
 346                                 }
 347                         }
 348                 }
 349
 350                 zholes_size = get_zholes_size(nid);
 351                 /*
 352                  * We let the lmem_map for node 0 be allocated from the
 353                  * normal bootmem allocator, but other nodes come from the
 354                  * remapped KVA area - mbligh
 355                  */
 356                 if (!nid)
 357                         free_area_init_node(nid, NODE_DATA(nid),
 358                                         zones_size, start, zholes_size);
 359                 else {
 360                         unsigned long lmem_map;
 361                         lmem_map = (unsigned long)node_remap_start_vaddr[nid];
 362                         lmem_map += sizeof(pg_data_t) + PAGE_SIZE - 1;
 363                         lmem_map &= PAGE_MASK;
 364                         NODE_DATA(nid)->node_mem_map = (struct page *)lmem_map;
 365                         free_area_init_node(nid, NODE_DATA(nid), zones_size,
 366                                 start, zholes_size);
 367                 }
 368         }
 369         return;
 370 }
 371
 372 void __init set_highmem_pages_init(int bad_ppro)
 373 {
 374 #ifdef CONFIG_HIGHMEM
 375         struct zone *zone;
 376
 377         for_each_zone(zone) {
 378                 unsigned long node_pfn, node_high_size, zone_start_pfn;
 379                 struct page * zone_mem_map;
 380
 381                 if (!is_highmem(zone))
 382                         continue;
 383
 384                 printk("Initializing %s for node %d\n", zone->name,
 385                         zone->zone_pgdat->node_id);
 386
 387                 node_high_size = zone->spanned_pages;
 388                 zone_mem_map = zone->zone_mem_map;
 389                 zone_start_pfn = zone->zone_start_pfn;
 390
 391                 for (node_pfn = 0; node_pfn < node_high_size; node_pfn++) {
 392                         one_highpage_init((struct page *)(zone_mem_map + node_pfn),
 393                                           zone_start_pfn + node_pfn, bad_ppro);
 394                 }
 395         }
 396         totalram_pages += totalhigh_pages;
 397 #endif
 398 }