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/mm.h>
  26 #include <linux/bootmem.h>
  27 #include <linux/mmzone.h>
  28 #include <linux/highmem.h>
  29 #include <linux/initrd.h>
  30 #include <linux/nodemask.h>
  31 #include <linux/module.h>
  32 #include <linux/kexec.h>
  33 #include <linux/pfn.h>
  34
  35 #include <asm/e820.h>
  36 #include <asm/setup.h>
  37 #include <asm/mmzone.h>
  38 #include <bios_ebda.h>
  39
  40 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  41 EXPORT_SYMBOL(node_data);
  42 bootmem_data_t node0_bdata;
  43
  44 /*
  45  * numa interface - we expect the numa architecture specific code to have
  46  *                  populated the following initialisation.
  47  *
  48  * 1) node_online_map  - the map of all nodes configured (online) in the system
  49  * 2) node_start_pfn   - the starting page frame number for a node
  50  * 3) node_end_pfn     - the ending page fram number for a node
  51  */
  52 unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly;
  53 unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly;
  54
  55
  56 #ifdef CONFIG_DISCONTIGMEM
  57 /*
  58  * 4) physnode_map     - the mapping between a pfn and owning node
  59  * physnode_map keeps track of the physical memory layout of a generic
  60  * numa node on a 256Mb break (each element of the array will
  61  * represent 256Mb of memory and will be marked by the node id.  so,
  62  * if the first gig is on node 0, and the second gig is on node 1
  63  * physnode_map will contain:
  64  *
  65  *     physnode_map[0-3] = 0;
  66  *     physnode_map[4-7] = 1;
  67  *     physnode_map[8- ] = -1;
  68  */
  69 s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1};
  70 EXPORT_SYMBOL(physnode_map);
  71
  72 void memory_present(int nid, unsigned long start, unsigned long end)
  73 {
  74         unsigned long pfn;
  75
  76         printk(KERN_INFO "Node: %d, start_pfn: %ld, end_pfn: %ld\n",
  77                         nid, start, end);
  78         printk(KERN_DEBUG "  Setting physnode_map array to node %d for pfns:\n", nid);
  79         printk(KERN_DEBUG "  ");
  80         for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) {
  81                 physnode_map[pfn / PAGES_PER_ELEMENT] = nid;
  82                 printk("%ld ", pfn);
  83         }
  84         printk("\n");
  85 }
  86
  87 unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
  88                                               unsigned long end_pfn)
  89 {
  90         unsigned long nr_pages = end_pfn - start_pfn;
  91
  92         if (!nr_pages)
  93                 return 0;
  94
  95         return (nr_pages + 1) * sizeof(struct page);
  96 }
  97 #endif
  98
  99 extern unsigned long find_max_low_pfn(void);
 100 extern void find_max_pfn(void);
 101 extern void add_one_highpage_init(struct page *, int, int);
 102
 103 extern struct e820map e820;
 104 extern unsigned long highend_pfn, highstart_pfn;
 105 extern unsigned long max_low_pfn;
 106 extern unsigned long totalram_pages;
 107 extern unsigned long totalhigh_pages;
 108
 109 #define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE)
 110
 111 unsigned long node_remap_start_pfn[MAX_NUMNODES];
 112 unsigned long node_remap_size[MAX_NUMNODES];
 113 unsigned long node_remap_offset[MAX_NUMNODES];
 114 void *node_remap_start_vaddr[MAX_NUMNODES];
 115 void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
 116
 117 void *node_remap_end_vaddr[MAX_NUMNODES];
 118 void *node_remap_alloc_vaddr[MAX_NUMNODES];
 119 static unsigned long kva_start_pfn;
 120 static unsigned long kva_pages;
 121 /*
 122  * FLAT - support for basic PC memory model with discontig enabled, essentially
 123  *        a single node with all available processors in it with a flat
 124  *        memory map.
 125  */
 126 int __init get_memcfg_numa_flat(void)
 127 {
 128         printk("NUMA - single node, flat memory mode\n");
 129
 130         /* Run the memory configuration and find the top of memory. */
 131         find_max_pfn();
 132         node_start_pfn[0] = 0;
 133         node_end_pfn[0] = max_pfn;
 134         memory_present(0, 0, max_pfn);
 135
 136         /* Indicate there is one node available. */
 137         nodes_clear(node_online_map);
 138         node_set_online(0);
 139         return 1;
 140 }
 141
 142 /*
 143  * Find the highest page frame number we have available for the node
 144  */
 145 static void __init find_max_pfn_node(int nid)
 146 {
 147         if (node_end_pfn[nid] > max_pfn)
 148                 node_end_pfn[nid] = max_pfn;
 149         /*
 150          * if a user has given mem=XXXX, then we need to make sure
 151          * that the node _starts_ before that, too, not just ends
 152          */
 153         if (node_start_pfn[nid] > max_pfn)
 154                 node_start_pfn[nid] = max_pfn;
 155         BUG_ON(node_start_pfn[nid] > node_end_pfn[nid]);
 156 }
 157
 158 /*
 159  * Allocate memory for the pg_data_t for this node via a crude pre-bootmem
 160  * method.  For node zero take this from the bottom of memory, for
 161  * subsequent nodes place them at node_remap_start_vaddr which contains
 162  * node local data in physically node local memory.  See setup_memory()
 163  * for details.
 164  */
 165 static void __init allocate_pgdat(int nid)
 166 {
 167         if (nid && node_has_online_mem(nid))
 168                 NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
 169         else {
 170                 NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(min_low_pfn));
 171                 min_low_pfn += PFN_UP(sizeof(pg_data_t));
 172         }
 173 }
 174
 175 void *alloc_remap(int nid, unsigned long size)
 176 {
 177         void *allocation = node_remap_alloc_vaddr[nid];
 178
 179         size = ALIGN(size, L1_CACHE_BYTES);
 180
 181         if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid])
 182                 return 0;
 183
 184         node_remap_alloc_vaddr[nid] += size;
 185         memset(allocation, 0, size);
 186
 187         return allocation;
 188 }
 189
 190 void __init remap_numa_kva(void)
 191 {
 192         void *vaddr;
 193         unsigned long pfn;
 194         int node;
 195
 196         for_each_online_node(node) {
 197                 for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) {
 198                         vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT);
 199                         set_pmd_pfn((ulong) vaddr,
 200                                 node_remap_start_pfn[node] + pfn,
 201                                 PAGE_KERNEL_LARGE);
 202                 }
 203         }
 204 }
 205
 206 static unsigned long calculate_numa_remap_pages(void)
 207 {
 208         int nid;
 209         unsigned long size, reserve_pages = 0;
 210         unsigned long pfn;
 211
 212         for_each_online_node(nid) {
 213                 unsigned old_end_pfn = node_end_pfn[nid];
 214
 215                 /*
 216                  * The acpi/srat node info can show hot-add memroy zones
 217                  * where memory could be added but not currently present.
 218                  */
 219                 if (node_start_pfn[nid] > max_pfn)
 220                         continue;
 221                 if (node_end_pfn[nid] > max_pfn)
 222                         node_end_pfn[nid] = max_pfn;
 223
 224                 /* ensure the remap includes space for the pgdat. */
 225                 size = node_remap_size[nid] + sizeof(pg_data_t);
 226
 227                 /* convert size to large (pmd size) pages, rounding up */
 228                 size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES;
 229                 /* now the roundup is correct, convert to PAGE_SIZE pages */
 230                 size = size * PTRS_PER_PTE;
 231
 232                 /*
 233                  * Validate the region we are allocating only contains valid
 234                  * pages.
 235                  */
 236                 for (pfn = node_end_pfn[nid] - size;
 237                      pfn < node_end_pfn[nid]; pfn++)
 238                         if (!page_is_ram(pfn))
 239                                 break;
 240
 241                 if (pfn != node_end_pfn[nid])
 242                         size = 0;
 243
 244                 printk("Reserving %ld pages of KVA for lmem_map of node %d\n",
 245                                 size, nid);
 246                 node_remap_size[nid] = size;
 247                 node_remap_offset[nid] = reserve_pages;
 248                 reserve_pages += size;
 249                 printk("Shrinking node %d from %ld pages to %ld pages\n",
 250                         nid, node_end_pfn[nid], node_end_pfn[nid] - size);
 251
 252                 if (node_end_pfn[nid] & (PTRS_PER_PTE-1)) {
 253                         /*
 254                          * Align node_end_pfn[] and node_remap_start_pfn[] to
 255                          * pmd boundary. remap_numa_kva will barf otherwise.
 256                          */
 257                         printk("Shrinking node %d further by %ld pages for proper alignment\n",
 258                                 nid, node_end_pfn[nid] & (PTRS_PER_PTE-1));
 259                         size +=  node_end_pfn[nid] & (PTRS_PER_PTE-1);
 260                 }
 261
 262                 node_end_pfn[nid] -= size;
 263                 node_remap_start_pfn[nid] = node_end_pfn[nid];
 264                 shrink_active_range(nid, old_end_pfn, node_end_pfn[nid]);
 265         }
 266         printk("Reserving total of %ld pages for numa KVA remap\n",
 267                         reserve_pages);
 268         return reserve_pages;
 269 }
 270
 271 extern void setup_bootmem_allocator(void);
 272 unsigned long __init setup_memory(void)
 273 {
 274         int nid;
 275         unsigned long system_start_pfn, system_max_low_pfn;
 276
 277         /*
 278          * When mapping a NUMA machine we allocate the node_mem_map arrays
 279          * from node local memory.  They are then mapped directly into KVA
 280          * between zone normal and vmalloc space.  Calculate the size of
 281          * this space and use it to adjust the boundry between ZONE_NORMAL
 282          * and ZONE_HIGHMEM.
 283          */
 284         find_max_pfn();
 285         get_memcfg_numa();
 286
 287         kva_pages = calculate_numa_remap_pages();
 288
 289         /* partially used pages are not usable - thus round upwards */
 290         system_start_pfn = min_low_pfn = PFN_UP(init_pg_tables_end);
 291
 292         kva_start_pfn = find_max_low_pfn() - kva_pages;
 293
 294 #ifdef CONFIG_BLK_DEV_INITRD
 295         /* Numa kva area is below the initrd */
 296         if (LOADER_TYPE && INITRD_START)
 297                 kva_start_pfn = PFN_DOWN(INITRD_START)  - kva_pages;
 298 #endif
 299         kva_start_pfn -= kva_start_pfn & (PTRS_PER_PTE-1);
 300
 301         system_max_low_pfn = max_low_pfn = find_max_low_pfn();
 302         printk("kva_start_pfn ~ %ld find_max_low_pfn() ~ %ld\n",
 303                 kva_start_pfn, max_low_pfn);
 304         printk("max_pfn = %ld\n", max_pfn);
 305 #ifdef CONFIG_HIGHMEM
 306         highstart_pfn = highend_pfn = max_pfn;
 307         if (max_pfn > system_max_low_pfn)
 308                 highstart_pfn = system_max_low_pfn;
 309         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 310                pages_to_mb(highend_pfn - highstart_pfn));
 311         num_physpages = highend_pfn;
 312         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 313 #else
 314         num_physpages = system_max_low_pfn;
 315         high_memory = (void *) __va(system_max_low_pfn * PAGE_SIZE - 1) + 1;
 316 #endif
 317         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 318                         pages_to_mb(system_max_low_pfn));
 319         printk("min_low_pfn = %ld, max_low_pfn = %ld, highstart_pfn = %ld\n",
 320                         min_low_pfn, max_low_pfn, highstart_pfn);
 321
 322         printk("Low memory ends at vaddr %08lx\n",
 323                         (ulong) pfn_to_kaddr(max_low_pfn));
 324         for_each_online_node(nid) {
 325                 node_remap_start_vaddr[nid] = pfn_to_kaddr(
 326                                 kva_start_pfn + node_remap_offset[nid]);
 327                 /* Init the node remap allocator */
 328                 node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] +
 329                         (node_remap_size[nid] * PAGE_SIZE);
 330                 node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] +
 331                         ALIGN(sizeof(pg_data_t), PAGE_SIZE);
 332
 333                 allocate_pgdat(nid);
 334                 printk ("node %d will remap to vaddr %08lx - %08lx\n", nid,
 335                         (ulong) node_remap_start_vaddr[nid],
 336                         (ulong) pfn_to_kaddr(highstart_pfn
 337                            + node_remap_offset[nid] + node_remap_size[nid]));
 338         }
 339         printk("High memory starts at vaddr %08lx\n",
 340                         (ulong) pfn_to_kaddr(highstart_pfn));
 341         for_each_online_node(nid)
 342                 find_max_pfn_node(nid);
 343
 344         memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
 345         NODE_DATA(0)->bdata = &node0_bdata;
 346         setup_bootmem_allocator();
 347         return max_low_pfn;
 348 }
 349
 350 void __init numa_kva_reserve(void)
 351 {
 352         reserve_bootmem(PFN_PHYS(kva_start_pfn),PFN_PHYS(kva_pages));
 353 }
 354
 355 void __init zone_sizes_init(void)
 356 {
 357         int nid;
 358         unsigned long max_zone_pfns[MAX_NR_ZONES];
 359         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 360         max_zone_pfns[ZONE_DMA] =
 361                 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 362         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 363         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
 364
 365         /* If SRAT has not registered memory, register it now */
 366         if (find_max_pfn_with_active_regions() == 0) {
 367                 for_each_online_node(nid) {
 368                         if (node_has_online_mem(nid))
 369                                 add_active_range(nid, node_start_pfn[nid],
 370                                                         node_end_pfn[nid]);
 371                 }
 372         }
 373
 374         free_area_init_nodes(max_zone_pfns);
 375         return;
 376 }
 377
 378 void __init set_highmem_pages_init(int bad_ppro)
 379 {
 380 #ifdef CONFIG_HIGHMEM
 381         struct zone *zone;
 382         struct page *page;
 383
 384         for_each_zone(zone) {
 385                 unsigned long node_pfn, zone_start_pfn, zone_end_pfn;
 386
 387                 if (!is_highmem(zone))
 388                         continue;
 389
 390                 zone_start_pfn = zone->zone_start_pfn;
 391                 zone_end_pfn = zone_start_pfn + zone->spanned_pages;
 392
 393                 printk("Initializing %s for node %d (%08lx:%08lx)\n",
 394                                 zone->name, zone_to_nid(zone),
 395                                 zone_start_pfn, zone_end_pfn);
 396
 397                 for (node_pfn = zone_start_pfn; node_pfn < zone_end_pfn; node_pfn++) {
 398                         if (!pfn_valid(node_pfn))
 399                                 continue;
 400                         page = pfn_to_page(node_pfn);
 401                         add_one_highpage_init(page, node_pfn, bad_ppro);
 402                 }
 403         }
 404         totalram_pages += totalhigh_pages;
 405 #endif
 406 }
 407
 408 #ifdef CONFIG_MEMORY_HOTPLUG
 409 int paddr_to_nid(u64 addr)
 410 {
 411         int nid;
 412         unsigned long pfn = PFN_DOWN(addr);
 413
 414         for_each_node(nid)
 415                 if (node_start_pfn[nid] <= pfn &&
 416                     pfn < node_end_pfn[nid])
 417                         return nid;
 418
 419         return -1;
 420 }
 421
 422 /*
 423  * This function is used to ask node id BEFORE memmap and mem_section's
 424  * initialization (pfn_to_nid() can't be used yet).
 425  * If _PXM is not defined on ACPI's DSDT, node id must be found by this.
 426  */
 427 int memory_add_physaddr_to_nid(u64 addr)
 428 {
 429         int nid = paddr_to_nid(addr);
 430         return (nid >= 0) ? nid : 0;
 431 }
 432
 433 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 434 #endif