arch/x86/mm/discontig_32.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 #include <linux/swap.h>
  35
  36 #include <asm/e820.h>
  37 #include <asm/setup.h>
  38 #include <asm/mmzone.h>
  39 #include <bios_ebda.h>
  40
  41 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
  42 EXPORT_SYMBOL(node_data);
  43 static bootmem_data_t node0_bdata;
  44
  45 /*
  46  * numa interface - we expect the numa architecture specific code to have
  47  *                  populated the following initialisation.
  48  *
  49  * 1) node_online_map  - the map of all nodes configured (online) in the system
  50  * 2) node_start_pfn   - the starting page frame number for a node
  51  * 3) node_end_pfn     - the ending page fram number for a node
  52  */
  53 unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly;
  54 unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly;
  55
  56
  57 #ifdef CONFIG_DISCONTIGMEM
  58 /*
  59  * 4) physnode_map     - the mapping between a pfn and owning node
  60  * physnode_map keeps track of the physical memory layout of a generic
  61  * numa node on a 256Mb break (each element of the array will
  62  * represent 256Mb of memory and will be marked by the node id.  so,
  63  * if the first gig is on node 0, and the second gig is on node 1
  64  * physnode_map will contain:
  65  *
  66  *     physnode_map[0-3] = 0;
  67  *     physnode_map[4-7] = 1;
  68  *     physnode_map[8- ] = -1;
  69  */
  70 s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1};
  71 EXPORT_SYMBOL(physnode_map);
  72
  73 void memory_present(int nid, unsigned long start, unsigned long end)
  74 {
  75         unsigned long pfn;
  76
  77         printk(KERN_INFO "Node: %d, start_pfn: %ld, end_pfn: %ld\n",
  78                         nid, start, end);
  79         printk(KERN_DEBUG "  Setting physnode_map array to node %d for pfns:\n", nid);
  80         printk(KERN_DEBUG "  ");
  81         for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) {
  82                 physnode_map[pfn / PAGES_PER_ELEMENT] = nid;
  83                 printk("%ld ", pfn);
  84         }
  85         printk("\n");
  86 }
  87
  88 unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
  89                                               unsigned long end_pfn)
  90 {
  91         unsigned long nr_pages = end_pfn - start_pfn;
  92
  93         if (!nr_pages)
  94                 return 0;
  95
  96         return (nr_pages + 1) * sizeof(struct page);
  97 }
  98 #endif
  99
 100 extern unsigned long find_max_low_pfn(void);
 101 extern void add_one_highpage_init(struct page *, int, int);
 102 extern unsigned long highend_pfn, highstart_pfn;
 103
 104 #define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE)
 105
 106 static unsigned long node_remap_start_pfn[MAX_NUMNODES];
 107 unsigned long node_remap_size[MAX_NUMNODES];
 108 static unsigned long node_remap_offset[MAX_NUMNODES];
 109 static void *node_remap_start_vaddr[MAX_NUMNODES];
 110 void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
 111
 112 static void *node_remap_end_vaddr[MAX_NUMNODES];
 113 static void *node_remap_alloc_vaddr[MAX_NUMNODES];
 114 static unsigned long kva_start_pfn;
 115 static unsigned long kva_pages;
 116 /*
 117  * FLAT - support for basic PC memory model with discontig enabled, essentially
 118  *        a single node with all available processors in it with a flat
 119  *        memory map.
 120  */
 121 int __init get_memcfg_numa_flat(void)
 122 {
 123         printk("NUMA - single node, flat memory mode\n");
 124
 125         /* Run the memory configuration and find the top of memory. */
 126         find_max_pfn();
 127         node_start_pfn[0] = 0;
 128         node_end_pfn[0] = max_pfn;
 129         memory_present(0, 0, max_pfn);
 130
 131         /* Indicate there is one node available. */
 132         nodes_clear(node_online_map);
 133         node_set_online(0);
 134         return 1;
 135 }
 136
 137 /*
 138  * Find the highest page frame number we have available for the node
 139  */
 140 static void __init find_max_pfn_node(int nid)
 141 {
 142         if (node_end_pfn[nid] > max_pfn)
 143                 node_end_pfn[nid] = max_pfn;
 144         /*
 145          * if a user has given mem=XXXX, then we need to make sure
 146          * that the node _starts_ before that, too, not just ends
 147          */
 148         if (node_start_pfn[nid] > max_pfn)
 149                 node_start_pfn[nid] = max_pfn;
 150         BUG_ON(node_start_pfn[nid] > node_end_pfn[nid]);
 151 }
 152
 153 /*
 154  * Allocate memory for the pg_data_t for this node via a crude pre-bootmem
 155  * method.  For node zero take this from the bottom of memory, for
 156  * subsequent nodes place them at node_remap_start_vaddr which contains
 157  * node local data in physically node local memory.  See setup_memory()
 158  * for details.
 159  */
 160 static void __init allocate_pgdat(int nid)
 161 {
 162         if (nid && node_has_online_mem(nid))
 163                 NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
 164         else {
 165                 NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(min_low_pfn));
 166                 min_low_pfn += PFN_UP(sizeof(pg_data_t));
 167         }
 168 }
 169
 170 void *alloc_remap(int nid, unsigned long size)
 171 {
 172         void *allocation = node_remap_alloc_vaddr[nid];
 173
 174         size = ALIGN(size, L1_CACHE_BYTES);
 175
 176         if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid])
 177                 return 0;
 178
 179         node_remap_alloc_vaddr[nid] += size;
 180         memset(allocation, 0, size);
 181
 182         return allocation;
 183 }
 184
 185 void __init remap_numa_kva(void)
 186 {
 187         void *vaddr;
 188         unsigned long pfn;
 189         int node;
 190
 191         for_each_online_node(node) {
 192                 for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) {
 193                         vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT);
 194                         set_pmd_pfn((ulong) vaddr,
 195                                 node_remap_start_pfn[node] + pfn,
 196                                 PAGE_KERNEL_LARGE);
 197                 }
 198         }
 199 }
 200
 201 static unsigned long calculate_numa_remap_pages(void)
 202 {
 203         int nid;
 204         unsigned long size, reserve_pages = 0;
 205         unsigned long pfn;
 206
 207         for_each_online_node(nid) {
 208                 unsigned old_end_pfn = node_end_pfn[nid];
 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
 227                 /*
 228                  * Validate the region we are allocating only contains valid
 229                  * pages.
 230                  */
 231                 for (pfn = node_end_pfn[nid] - size;
 232                      pfn < node_end_pfn[nid]; pfn++)
 233                         if (!page_is_ram(pfn))
 234                                 break;
 235
 236                 if (pfn != node_end_pfn[nid])
 237                         size = 0;
 238
 239                 printk("Reserving %ld pages of KVA for lmem_map of node %d\n",
 240                                 size, nid);
 241                 node_remap_size[nid] = size;
 242                 node_remap_offset[nid] = reserve_pages;
 243                 reserve_pages += size;
 244                 printk("Shrinking node %d from %ld pages to %ld pages\n",
 245                         nid, node_end_pfn[nid], node_end_pfn[nid] - size);
 246
 247                 if (node_end_pfn[nid] & (PTRS_PER_PTE-1)) {
 248                         /*
 249                          * Align node_end_pfn[] and node_remap_start_pfn[] to
 250                          * pmd boundary. remap_numa_kva will barf otherwise.
 251                          */
 252                         printk("Shrinking node %d further by %ld pages for proper alignment\n",
 253                                 nid, node_end_pfn[nid] & (PTRS_PER_PTE-1));
 254                         size +=  node_end_pfn[nid] & (PTRS_PER_PTE-1);
 255                 }
 256
 257                 node_end_pfn[nid] -= size;
 258                 node_remap_start_pfn[nid] = node_end_pfn[nid];
 259                 shrink_active_range(nid, old_end_pfn, node_end_pfn[nid]);
 260         }
 261         printk("Reserving total of %ld pages for numa KVA remap\n",
 262                         reserve_pages);
 263         return reserve_pages;
 264 }
 265
 266 extern void setup_bootmem_allocator(void);
 267 unsigned long __init setup_memory(void)
 268 {
 269         int nid;
 270         unsigned long system_start_pfn, system_max_low_pfn;
 271
 272         /*
 273          * When mapping a NUMA machine we allocate the node_mem_map arrays
 274          * from node local memory.  They are then mapped directly into KVA
 275          * between zone normal and vmalloc space.  Calculate the size of
 276          * this space and use it to adjust the boundary between ZONE_NORMAL
 277          * and ZONE_HIGHMEM.
 278          */
 279         find_max_pfn();
 280         get_memcfg_numa();
 281
 282         kva_pages = calculate_numa_remap_pages();
 283
 284         /* partially used pages are not usable - thus round upwards */
 285         system_start_pfn = min_low_pfn = PFN_UP(init_pg_tables_end);
 286
 287         kva_start_pfn = find_max_low_pfn() - kva_pages;
 288
 289 #ifdef CONFIG_BLK_DEV_INITRD
 290         /* Numa kva area is below the initrd */
 291         if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image)
 292                 kva_start_pfn = PFN_DOWN(boot_params.hdr.ramdisk_image)
 293                         - kva_pages;
 294 #endif
 295         kva_start_pfn -= kva_start_pfn & (PTRS_PER_PTE-1);
 296
 297         system_max_low_pfn = max_low_pfn = find_max_low_pfn();
 298         printk("kva_start_pfn ~ %ld find_max_low_pfn() ~ %ld\n",
 299                 kva_start_pfn, max_low_pfn);
 300         printk("max_pfn = %ld\n", max_pfn);
 301 #ifdef CONFIG_HIGHMEM
 302         highstart_pfn = highend_pfn = max_pfn;
 303         if (max_pfn > system_max_low_pfn)
 304                 highstart_pfn = system_max_low_pfn;
 305         printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
 306                pages_to_mb(highend_pfn - highstart_pfn));
 307         num_physpages = highend_pfn;
 308         high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
 309 #else
 310         num_physpages = system_max_low_pfn;
 311         high_memory = (void *) __va(system_max_low_pfn * PAGE_SIZE - 1) + 1;
 312 #endif
 313         printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
 314                         pages_to_mb(system_max_low_pfn));
 315         printk("min_low_pfn = %ld, max_low_pfn = %ld, highstart_pfn = %ld\n",
 316                         min_low_pfn, max_low_pfn, highstart_pfn);
 317
 318         printk("Low memory ends at vaddr %08lx\n",
 319                         (ulong) pfn_to_kaddr(max_low_pfn));
 320         for_each_online_node(nid) {
 321                 node_remap_start_vaddr[nid] = pfn_to_kaddr(
 322                                 kva_start_pfn + node_remap_offset[nid]);
 323                 /* Init the node remap allocator */
 324                 node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] +
 325                         (node_remap_size[nid] * PAGE_SIZE);
 326                 node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] +
 327                         ALIGN(sizeof(pg_data_t), PAGE_SIZE);
 328
 329                 allocate_pgdat(nid);
 330                 printk ("node %d will remap to vaddr %08lx - %08lx\n", nid,
 331                         (ulong) node_remap_start_vaddr[nid],
 332                         (ulong) pfn_to_kaddr(highstart_pfn
 333                            + node_remap_offset[nid] + node_remap_size[nid]));
 334         }
 335         printk("High memory starts at vaddr %08lx\n",
 336                         (ulong) pfn_to_kaddr(highstart_pfn));
 337         for_each_online_node(nid)
 338                 find_max_pfn_node(nid);
 339
 340         memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
 341         NODE_DATA(0)->bdata = &node0_bdata;
 342         setup_bootmem_allocator();
 343         return max_low_pfn;
 344 }
 345
 346 void __init numa_kva_reserve(void)
 347 {
 348         reserve_bootmem(PFN_PHYS(kva_start_pfn),PFN_PHYS(kva_pages));
 349 }
 350
 351 void __init zone_sizes_init(void)
 352 {
 353         int nid;
 354         unsigned long max_zone_pfns[MAX_NR_ZONES];
 355         memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
 356         max_zone_pfns[ZONE_DMA] =
 357                 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
 358         max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
 359 #ifdef CONFIG_HIGHMEM
 360         max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
 361 #endif
 362
 363         /* If SRAT has not registered memory, register it now */
 364         if (find_max_pfn_with_active_regions() == 0) {
 365                 for_each_online_node(nid) {
 366                         if (node_has_online_mem(nid))
 367                                 add_active_range(nid, node_start_pfn[nid],
 368                                                         node_end_pfn[nid]);
 369                 }
 370         }
 371
 372         free_area_init_nodes(max_zone_pfns);
 373         return;
 374 }
 375
 376 void __init set_highmem_pages_init(int bad_ppro)
 377 {
 378 #ifdef CONFIG_HIGHMEM
 379         struct zone *zone;
 380         struct page *page;
 381
 382         for_each_zone(zone) {
 383                 unsigned long node_pfn, zone_start_pfn, zone_end_pfn;
 384
 385                 if (!is_highmem(zone))
 386                         continue;
 387
 388                 zone_start_pfn = zone->zone_start_pfn;
 389                 zone_end_pfn = zone_start_pfn + zone->spanned_pages;
 390
 391                 printk("Initializing %s for node %d (%08lx:%08lx)\n",
 392                                 zone->name, zone_to_nid(zone),
 393                                 zone_start_pfn, zone_end_pfn);
 394
 395                 for (node_pfn = zone_start_pfn; node_pfn < zone_end_pfn; node_pfn++) {
 396                         if (!pfn_valid(node_pfn))
 397                                 continue;
 398                         page = pfn_to_page(node_pfn);
 399                         add_one_highpage_init(page, node_pfn, bad_ppro);
 400                 }
 401         }
 402         totalram_pages += totalhigh_pages;
 403 #endif
 404 }
 405
 406 #ifdef CONFIG_MEMORY_HOTPLUG
 407 static int paddr_to_nid(u64 addr)
 408 {
 409         int nid;
 410         unsigned long pfn = PFN_DOWN(addr);
 411
 412         for_each_node(nid)
 413                 if (node_start_pfn[nid] <= pfn &&
 414                     pfn < node_end_pfn[nid])
 415                         return nid;
 416
 417         return -1;
 418 }
 419
 420 /*
 421  * This function is used to ask node id BEFORE memmap and mem_section's
 422  * initialization (pfn_to_nid() can't be used yet).
 423  * If _PXM is not defined on ACPI's DSDT, node id must be found by this.
 424  */
 425 int memory_add_physaddr_to_nid(u64 addr)
 426 {
 427         int nid = paddr_to_nid(addr);
 428         return (nid >= 0) ? nid : 0;
 429 }
 430
 431 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 432 #endif