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 41struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; 42EXPORT_SYMBOL(node_data); 43bootmem_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 */ 53unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly; 54unsigned 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 */ 70s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1}; 71EXPORT_SYMBOL(physnode_map); 72 73void 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 88unsigned 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 100extern unsigned long find_max_low_pfn(void); 101extern void add_one_highpage_init(struct page *, int, int); 102extern unsigned long highend_pfn, highstart_pfn; 103 104#define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE) 105 106unsigned long node_remap_start_pfn[MAX_NUMNODES]; 107unsigned long node_remap_size[MAX_NUMNODES]; 108unsigned long node_remap_offset[MAX_NUMNODES]; 109void *node_remap_start_vaddr[MAX_NUMNODES]; 110void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags); 111 112void *node_remap_end_vaddr[MAX_NUMNODES]; 113void *node_remap_alloc_vaddr[MAX_NUMNODES]; 114static unsigned long kva_start_pfn; 115static 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 */ 121int __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 */ 140static 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 if (node_start_pfn[nid] > max_pfn) 145 node_start_pfn[nid] = max_pfn; 146 BUG_ON(node_start_pfn[nid] > node_end_pfn[nid]); 147} 148 149/* 150 * Allocate memory for the pg_data_t for this node via a crude pre-bootmem 151 * method. For node zero take this from the bottom of memory, for 152 * subsequent nodes place them at node_remap_start_vaddr which contains 153 * node local data in physically node local memory. See setup_memory() 154 * for details. 155 */ 156static void __init allocate_pgdat(int nid) 157{ 158 if (nid && node_has_online_mem(nid)) 159 NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid]; 160 else { 161 NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(min_low_pfn)); 162 min_low_pfn += PFN_UP(sizeof(pg_data_t)); 163 } 164} 165 166void *alloc_remap(int nid, unsigned long size) 167{ 168 void *allocation = node_remap_alloc_vaddr[nid]; 169 170 size = ALIGN(size, L1_CACHE_BYTES); 171 172 if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid]) 173 return 0; 174 175 node_remap_alloc_vaddr[nid] += size; 176 memset(allocation, 0, size); 177 178 return allocation; 179} 180 181void __init remap_numa_kva(void) 182{ 183 void *vaddr; 184 unsigned long pfn; 185 int node; 186 187 for_each_online_node(node) { 188 for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) { 189 vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT); 190 set_pmd_pfn((ulong) vaddr, 191 node_remap_start_pfn[node] + pfn, 192 PAGE_KERNEL_LARGE); 193 } 194 } 195} 196 197static unsigned long calculate_numa_remap_pages(void) 198{ 199 int nid; 200 unsigned long size, reserve_pages = 0; 201 unsigned long pfn; 202 203 for_each_online_node(nid) { 204 unsigned old_end_pfn = node_end_pfn[nid]; 205 206 /* 207 * The acpi/srat node info can show hot-add memroy zones 208 * where memory could be added but not currently present. 209 */ 210 if (node_start_pfn[nid] > max_pfn) 211 continue; 212 if (node_end_pfn[nid] > max_pfn) 213 node_end_pfn[nid] = max_pfn; 214 215 /* ensure the remap includes space for the pgdat. */ 216 size = node_remap_size[nid] + sizeof(pg_data_t); 217 218 /* convert size to large (pmd size) pages, rounding up */ 219 size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES; 220 /* now the roundup is correct, convert to PAGE_SIZE pages */ 221 size = size * PTRS_PER_PTE; 222 223 /* 224 * Validate the region we are allocating only contains valid 225 * pages. 226 */ 227 for (pfn = node_end_pfn[nid] - size; 228 pfn < node_end_pfn[nid]; pfn++) 229 if (!page_is_ram(pfn)) 230 break; 231 232 if (pfn != node_end_pfn[nid]) 233 size = 0; 234 235 printk("Reserving %ld pages of KVA for lmem_map of node %d\n", 236 size, nid); 237 node_remap_size[nid] = size; 238 node_remap_offset[nid] = reserve_pages; 239 reserve_pages += size; 240 printk("Shrinking node %d from %ld pages to %ld pages\n", 241 nid, node_end_pfn[nid], node_end_pfn[nid] - size); 242 243 if (node_end_pfn[nid] & (PTRS_PER_PTE-1)) { 244 /* 245 * Align node_end_pfn[] and node_remap_start_pfn[] to 246 * pmd boundary. remap_numa_kva will barf otherwise. 247 */ 248 printk("Shrinking node %d further by %ld pages for proper alignment\n", 249 nid, node_end_pfn[nid] & (PTRS_PER_PTE-1)); 250 size += node_end_pfn[nid] & (PTRS_PER_PTE-1); 251 } 252 253 node_end_pfn[nid] -= size; 254 node_remap_start_pfn[nid] = node_end_pfn[nid]; 255 shrink_active_range(nid, old_end_pfn, node_end_pfn[nid]); 256 } 257 printk("Reserving total of %ld pages for numa KVA remap\n", 258 reserve_pages); 259 return reserve_pages; 260} 261 262extern void setup_bootmem_allocator(void); 263unsigned long __init setup_memory(void) 264{ 265 int nid; 266 unsigned long system_start_pfn, system_max_low_pfn; 267 268 /* 269 * When mapping a NUMA machine we allocate the node_mem_map arrays 270 * from node local memory. They are then mapped directly into KVA 271 * between zone normal and vmalloc space. Calculate the size of 272 * this space and use it to adjust the boundry between ZONE_NORMAL 273 * and ZONE_HIGHMEM. 274 */ 275 find_max_pfn(); 276 get_memcfg_numa(); 277 278 kva_pages = calculate_numa_remap_pages(); 279 280 /* partially used pages are not usable - thus round upwards */ 281 system_start_pfn = min_low_pfn = PFN_UP(init_pg_tables_end); 282 283 kva_start_pfn = find_max_low_pfn() - kva_pages; 284 285#ifdef CONFIG_BLK_DEV_INITRD 286 /* Numa kva area is below the initrd */ 287 if (LOADER_TYPE && INITRD_START) 288 kva_start_pfn = PFN_DOWN(INITRD_START) - kva_pages; 289#endif 290 kva_start_pfn -= kva_start_pfn & (PTRS_PER_PTE-1); 291 292 system_max_low_pfn = max_low_pfn = find_max_low_pfn(); 293 printk("kva_start_pfn ~ %ld find_max_low_pfn() ~ %ld\n", 294 kva_start_pfn, max_low_pfn); 295 printk("max_pfn = %ld\n", max_pfn); 296#ifdef CONFIG_HIGHMEM 297 highstart_pfn = highend_pfn = max_pfn; 298 if (max_pfn > system_max_low_pfn) 299 highstart_pfn = system_max_low_pfn; 300 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", 301 pages_to_mb(highend_pfn - highstart_pfn)); 302 num_physpages = highend_pfn; 303 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; 304#else 305 num_physpages = system_max_low_pfn; 306 high_memory = (void *) __va(system_max_low_pfn * PAGE_SIZE - 1) + 1; 307#endif 308 printk(KERN_NOTICE "%ldMB LOWMEM available.\n", 309 pages_to_mb(system_max_low_pfn)); 310 printk("min_low_pfn = %ld, max_low_pfn = %ld, highstart_pfn = %ld\n", 311 min_low_pfn, max_low_pfn, highstart_pfn); 312 313 printk("Low memory ends at vaddr %08lx\n", 314 (ulong) pfn_to_kaddr(max_low_pfn)); 315 for_each_online_node(nid) { 316 node_remap_start_vaddr[nid] = pfn_to_kaddr( 317 kva_start_pfn + node_remap_offset[nid]); 318 /* Init the node remap allocator */ 319 node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] + 320 (node_remap_size[nid] * PAGE_SIZE); 321 node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] + 322 ALIGN(sizeof(pg_data_t), PAGE_SIZE); 323 324 allocate_pgdat(nid); 325 printk ("node %d will remap to vaddr %08lx - %08lx\n", nid, 326 (ulong) node_remap_start_vaddr[nid], 327 (ulong) pfn_to_kaddr(highstart_pfn 328 + node_remap_offset[nid] + node_remap_size[nid])); 329 } 330 printk("High memory starts at vaddr %08lx\n", 331 (ulong) pfn_to_kaddr(highstart_pfn)); 332 for_each_online_node(nid) 333 find_max_pfn_node(nid); 334 335 memset(NODE_DATA(0), 0, sizeof(struct pglist_data)); 336 NODE_DATA(0)->bdata = &node0_bdata; 337 setup_bootmem_allocator(); 338 return max_low_pfn; 339} 340 341void __init numa_kva_reserve(void) 342{ 343 reserve_bootmem(PFN_PHYS(kva_start_pfn),PFN_PHYS(kva_pages)); 344} 345 346void __init zone_sizes_init(void) 347{ 348 int nid; 349 unsigned long max_zone_pfns[MAX_NR_ZONES]; 350 memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); 351 max_zone_pfns[ZONE_DMA] = 352 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT; 353 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 354#ifdef CONFIG_HIGHMEM 355 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn; 356#endif 357 358 /* If SRAT has not registered memory, register it now */ 359 if (find_max_pfn_with_active_regions() == 0) { 360 for_each_online_node(nid) { 361 if (node_has_online_mem(nid)) 362 add_active_range(nid, node_start_pfn[nid], 363 node_end_pfn[nid]); 364 } 365 } 366 367 free_area_init_nodes(max_zone_pfns); 368 return; 369} 370 371void __init set_highmem_pages_init(int bad_ppro) 372{ 373#ifdef CONFIG_HIGHMEM 374 struct zone *zone; 375 struct page *page; 376 377 for_each_zone(zone) { 378 unsigned long node_pfn, zone_start_pfn, zone_end_pfn; 379 380 if (!is_highmem(zone)) 381 continue; 382 383 zone_start_pfn = zone->zone_start_pfn; 384 zone_end_pfn = zone_start_pfn + zone->spanned_pages; 385 386 printk("Initializing %s for node %d (%08lx:%08lx)\n", 387 zone->name, zone_to_nid(zone), 388 zone_start_pfn, zone_end_pfn); 389 390 for (node_pfn = zone_start_pfn; node_pfn < zone_end_pfn; node_pfn++) { 391 if (!pfn_valid(node_pfn)) 392 continue; 393 page = pfn_to_page(node_pfn); 394 add_one_highpage_init(page, node_pfn, bad_ppro); 395 } 396 } 397 totalram_pages += totalhigh_pages; 398#endif 399} 400 401#ifdef CONFIG_MEMORY_HOTPLUG 402int paddr_to_nid(u64 addr) 403{ 404 int nid; 405 unsigned long pfn = PFN_DOWN(addr); 406 407 for_each_node(nid) 408 if (node_start_pfn[nid] <= pfn && 409 pfn < node_end_pfn[nid]) 410 return nid; 411 412 return -1; 413} 414 415/* 416 * This function is used to ask node id BEFORE memmap and mem_section's 417 * initialization (pfn_to_nid() can't be used yet). 418 * If _PXM is not defined on ACPI's DSDT, node id must be found by this. 419 */ 420int memory_add_physaddr_to_nid(u64 addr) 421{ 422 int nid = paddr_to_nid(addr); 423 return (nid >= 0) ? nid : 0; 424} 425 426EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 427#endif 428