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/memblock.h> 28 #include <linux/mmzone.h> 29 #include <linux/highmem.h> 30 #include <linux/initrd.h> 31 #include <linux/nodemask.h> 32 #include <linux/module.h> 33 #include <linux/kexec.h> 34 #include <linux/pfn.h> 35 #include <linux/swap.h> 36 #include <linux/acpi.h> 37 38 #include <asm/e820.h> 39 #include <asm/setup.h> 40 #include <asm/mmzone.h> 41 #include <asm/bios_ebda.h> 42 #include <asm/proto.h> 43 44 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; 45 EXPORT_SYMBOL(node_data); 46 47 /* 48 * numa interface - we expect the numa architecture specific code to have 49 * populated the following initialisation. 50 * 51 * 1) node_online_map - the map of all nodes configured (online) in the system 52 * 2) node_start_pfn - the starting page frame number for a node 53 * 3) node_end_pfn - the ending page fram number for a node 54 */ 55 unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly; 56 unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly; 57 58 59 #ifdef CONFIG_DISCONTIGMEM 60 /* 61 * 4) physnode_map - the mapping between a pfn and owning node 62 * physnode_map keeps track of the physical memory layout of a generic 63 * numa node on a 64Mb break (each element of the array will 64 * represent 64Mb of memory and will be marked by the node id. so, 65 * if the first gig is on node 0, and the second gig is on node 1 66 * physnode_map will contain: 67 * 68 * physnode_map[0-15] = 0; 69 * physnode_map[16-31] = 1; 70 * physnode_map[32- ] = -1; 71 */ 72 s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1}; 73 EXPORT_SYMBOL(physnode_map); 74 75 void memory_present(int nid, unsigned long start, unsigned long end) 76 { 77 unsigned long pfn; 78 79 printk(KERN_INFO "Node: %d, start_pfn: %lx, end_pfn: %lx\n", 80 nid, start, end); 81 printk(KERN_DEBUG " Setting physnode_map array to node %d for pfns:\n", nid); 82 printk(KERN_DEBUG " "); 83 for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) { 84 physnode_map[pfn / PAGES_PER_ELEMENT] = nid; 85 printk(KERN_CONT "%lx ", pfn); 86 } 87 printk(KERN_CONT "\n"); 88 } 89 90 unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn, 91 unsigned long end_pfn) 92 { 93 unsigned long nr_pages = end_pfn - start_pfn; 94 95 if (!nr_pages) 96 return 0; 97 98 return (nr_pages + 1) * sizeof(struct page); 99 } 100 #endif 101 102 extern unsigned long find_max_low_pfn(void); 103 extern unsigned long highend_pfn, highstart_pfn; 104 105 #define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE) 106 107 unsigned long node_remap_size[MAX_NUMNODES]; 108 static void *node_remap_start_vaddr[MAX_NUMNODES]; 109 void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags); 110 111 static unsigned long kva_start_pfn; 112 static unsigned long kva_pages; 113 /* 114 * FLAT - support for basic PC memory model with discontig enabled, essentially 115 * a single node with all available processors in it with a flat 116 * memory map. 117 */ 118 int __init get_memcfg_numa_flat(void) 119 { 120 printk(KERN_DEBUG "NUMA - single node, flat memory mode\n"); 121 122 node_start_pfn[0] = 0; 123 node_end_pfn[0] = max_pfn; 124 memblock_x86_register_active_regions(0, 0, max_pfn); 125 memory_present(0, 0, max_pfn); 126 node_remap_size[0] = node_memmap_size_bytes(0, 0, max_pfn); 127 128 /* Indicate there is one node available. */ 129 nodes_clear(node_online_map); 130 node_set_online(0); 131 return 1; 132 } 133 134 /* 135 * Find the highest page frame number we have available for the node 136 */ 137 static void __init propagate_e820_map_node(int nid) 138 { 139 if (node_end_pfn[nid] > max_pfn) 140 node_end_pfn[nid] = max_pfn; 141 /* 142 * if a user has given mem=XXXX, then we need to make sure 143 * that the node _starts_ before that, too, not just ends 144 */ 145 if (node_start_pfn[nid] > max_pfn) 146 node_start_pfn[nid] = max_pfn; 147 BUG_ON(node_start_pfn[nid] > node_end_pfn[nid]); 148 } 149 150 /* 151 * Allocate memory for the pg_data_t for this node via a crude pre-bootmem 152 * method. For node zero take this from the bottom of memory, for 153 * subsequent nodes place them at node_remap_start_vaddr which contains 154 * node local data in physically node local memory. See setup_memory() 155 * for details. 156 */ 157 static void __init allocate_pgdat(int nid) 158 { 159 char buf[16]; 160 161 if (node_has_online_mem(nid) && node_remap_start_vaddr[nid]) 162 NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid]; 163 else { 164 unsigned long pgdat_phys; 165 pgdat_phys = memblock_find_in_range(min_low_pfn<<PAGE_SHIFT, 166 max_pfn_mapped<<PAGE_SHIFT, 167 sizeof(pg_data_t), 168 PAGE_SIZE); 169 NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(pgdat_phys>>PAGE_SHIFT)); 170 memset(buf, 0, sizeof(buf)); 171 sprintf(buf, "NODE_DATA %d", nid); 172 memblock_x86_reserve_range(pgdat_phys, pgdat_phys + sizeof(pg_data_t), buf); 173 } 174 printk(KERN_DEBUG "allocate_pgdat: node %d NODE_DATA %08lx\n", 175 nid, (unsigned long)NODE_DATA(nid)); 176 } 177 178 /* 179 * In the DISCONTIGMEM and SPARSEMEM memory model, a portion of the kernel 180 * virtual address space (KVA) is reserved and portions of nodes are mapped 181 * using it. This is to allow node-local memory to be allocated for 182 * structures that would normally require ZONE_NORMAL. The memory is 183 * allocated with alloc_remap() and callers should be prepared to allocate 184 * from the bootmem allocator instead. 185 */ 186 static unsigned long node_remap_start_pfn[MAX_NUMNODES]; 187 static void *node_remap_end_vaddr[MAX_NUMNODES]; 188 static void *node_remap_alloc_vaddr[MAX_NUMNODES]; 189 static unsigned long node_remap_offset[MAX_NUMNODES]; 190 191 void *alloc_remap(int nid, unsigned long size) 192 { 193 void *allocation = node_remap_alloc_vaddr[nid]; 194 195 size = ALIGN(size, L1_CACHE_BYTES); 196 197 if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid]) 198 return NULL; 199 200 node_remap_alloc_vaddr[nid] += size; 201 memset(allocation, 0, size); 202 203 return allocation; 204 } 205 206 static void __init remap_numa_kva(void) 207 { 208 void *vaddr; 209 unsigned long pfn; 210 int node; 211 212 for_each_online_node(node) { 213 printk(KERN_DEBUG "remap_numa_kva: node %d\n", node); 214 for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) { 215 vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT); 216 printk(KERN_DEBUG "remap_numa_kva: %08lx to pfn %08lx\n", 217 (unsigned long)vaddr, 218 node_remap_start_pfn[node] + pfn); 219 set_pmd_pfn((ulong) vaddr, 220 node_remap_start_pfn[node] + pfn, 221 PAGE_KERNEL_LARGE); 222 } 223 } 224 } 225 226 #ifdef CONFIG_HIBERNATION 227 /** 228 * resume_map_numa_kva - add KVA mapping to the temporary page tables created 229 * during resume from hibernation 230 * @pgd_base - temporary resume page directory 231 */ 232 void resume_map_numa_kva(pgd_t *pgd_base) 233 { 234 int node; 235 236 for_each_online_node(node) { 237 unsigned long start_va, start_pfn, size, pfn; 238 239 start_va = (unsigned long)node_remap_start_vaddr[node]; 240 start_pfn = node_remap_start_pfn[node]; 241 size = node_remap_size[node]; 242 243 printk(KERN_DEBUG "%s: node %d\n", __func__, node); 244 245 for (pfn = 0; pfn < size; pfn += PTRS_PER_PTE) { 246 unsigned long vaddr = start_va + (pfn << PAGE_SHIFT); 247 pgd_t *pgd = pgd_base + pgd_index(vaddr); 248 pud_t *pud = pud_offset(pgd, vaddr); 249 pmd_t *pmd = pmd_offset(pud, vaddr); 250 251 set_pmd(pmd, pfn_pmd(start_pfn + pfn, 252 PAGE_KERNEL_LARGE_EXEC)); 253 254 printk(KERN_DEBUG "%s: %08lx -> pfn %08lx\n", 255 __func__, vaddr, start_pfn + pfn); 256 } 257 } 258 } 259 #endif 260 261 static __init unsigned long calculate_numa_remap_pages(void) 262 { 263 int nid; 264 unsigned long size, reserve_pages = 0; 265 266 for_each_online_node(nid) { 267 u64 node_kva_target; 268 u64 node_kva_final; 269 270 /* 271 * The acpi/srat node info can show hot-add memroy zones 272 * where memory could be added but not currently present. 273 */ 274 printk(KERN_DEBUG "node %d pfn: [%lx - %lx]\n", 275 nid, node_start_pfn[nid], node_end_pfn[nid]); 276 if (node_start_pfn[nid] > max_pfn) 277 continue; 278 if (!node_end_pfn[nid]) 279 continue; 280 if (node_end_pfn[nid] > max_pfn) 281 node_end_pfn[nid] = max_pfn; 282 283 /* ensure the remap includes space for the pgdat. */ 284 size = node_remap_size[nid] + sizeof(pg_data_t); 285 286 /* convert size to large (pmd size) pages, rounding up */ 287 size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES; 288 /* now the roundup is correct, convert to PAGE_SIZE pages */ 289 size = size * PTRS_PER_PTE; 290 291 node_kva_target = round_down(node_end_pfn[nid] - size, 292 PTRS_PER_PTE); 293 node_kva_target <<= PAGE_SHIFT; 294 do { 295 node_kva_final = memblock_find_in_range(node_kva_target, 296 ((u64)node_end_pfn[nid])<<PAGE_SHIFT, 297 ((u64)size)<<PAGE_SHIFT, 298 LARGE_PAGE_BYTES); 299 node_kva_target -= LARGE_PAGE_BYTES; 300 } while (node_kva_final == MEMBLOCK_ERROR && 301 (node_kva_target>>PAGE_SHIFT) > (node_start_pfn[nid])); 302 303 if (node_kva_final == MEMBLOCK_ERROR) 304 panic("Can not get kva ram\n"); 305 306 node_remap_size[nid] = size; 307 node_remap_offset[nid] = reserve_pages; 308 reserve_pages += size; 309 printk(KERN_DEBUG "Reserving %ld pages of KVA for lmem_map of" 310 " node %d at %llx\n", 311 size, nid, node_kva_final>>PAGE_SHIFT); 312 313 /* 314 * prevent kva address below max_low_pfn want it on system 315 * with less memory later. 316 * layout will be: KVA address , KVA RAM 317 * 318 * we are supposed to only record the one less then max_low_pfn 319 * but we could have some hole in high memory, and it will only 320 * check page_is_ram(pfn) && !page_is_reserved_early(pfn) to decide 321 * to use it as free. 322 * So memblock_x86_reserve_range here, hope we don't run out of that array 323 */ 324 memblock_x86_reserve_range(node_kva_final, 325 node_kva_final+(((u64)size)<<PAGE_SHIFT), 326 "KVA RAM"); 327 328 node_remap_start_pfn[nid] = node_kva_final>>PAGE_SHIFT; 329 } 330 printk(KERN_INFO "Reserving total of %lx pages for numa KVA remap\n", 331 reserve_pages); 332 return reserve_pages; 333 } 334 335 static void init_remap_allocator(int nid) 336 { 337 node_remap_start_vaddr[nid] = pfn_to_kaddr( 338 kva_start_pfn + node_remap_offset[nid]); 339 node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] + 340 (node_remap_size[nid] * PAGE_SIZE); 341 node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] + 342 ALIGN(sizeof(pg_data_t), PAGE_SIZE); 343 344 printk(KERN_DEBUG "node %d will remap to vaddr %08lx - %08lx\n", nid, 345 (ulong) node_remap_start_vaddr[nid], 346 (ulong) node_remap_end_vaddr[nid]); 347 } 348 349 void __init initmem_init(unsigned long start_pfn, unsigned long end_pfn, 350 int acpi, int k8) 351 { 352 int nid; 353 long kva_target_pfn; 354 355 /* 356 * When mapping a NUMA machine we allocate the node_mem_map arrays 357 * from node local memory. They are then mapped directly into KVA 358 * between zone normal and vmalloc space. Calculate the size of 359 * this space and use it to adjust the boundary between ZONE_NORMAL 360 * and ZONE_HIGHMEM. 361 */ 362 363 get_memcfg_numa(); 364 365 kva_pages = roundup(calculate_numa_remap_pages(), PTRS_PER_PTE); 366 367 kva_target_pfn = round_down(max_low_pfn - kva_pages, PTRS_PER_PTE); 368 do { 369 kva_start_pfn = memblock_find_in_range(kva_target_pfn<<PAGE_SHIFT, 370 max_low_pfn<<PAGE_SHIFT, 371 kva_pages<<PAGE_SHIFT, 372 PTRS_PER_PTE<<PAGE_SHIFT) >> PAGE_SHIFT; 373 kva_target_pfn -= PTRS_PER_PTE; 374 } while (kva_start_pfn == MEMBLOCK_ERROR && kva_target_pfn > min_low_pfn); 375 376 if (kva_start_pfn == MEMBLOCK_ERROR) 377 panic("Can not get kva space\n"); 378 379 printk(KERN_INFO "kva_start_pfn ~ %lx max_low_pfn ~ %lx\n", 380 kva_start_pfn, max_low_pfn); 381 printk(KERN_INFO "max_pfn = %lx\n", max_pfn); 382 383 /* avoid clash with initrd */ 384 memblock_x86_reserve_range(kva_start_pfn<<PAGE_SHIFT, 385 (kva_start_pfn + kva_pages)<<PAGE_SHIFT, 386 "KVA PG"); 387 #ifdef CONFIG_HIGHMEM 388 highstart_pfn = highend_pfn = max_pfn; 389 if (max_pfn > max_low_pfn) 390 highstart_pfn = max_low_pfn; 391 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", 392 pages_to_mb(highend_pfn - highstart_pfn)); 393 num_physpages = highend_pfn; 394 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; 395 #else 396 num_physpages = max_low_pfn; 397 high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; 398 #endif 399 printk(KERN_NOTICE "%ldMB LOWMEM available.\n", 400 pages_to_mb(max_low_pfn)); 401 printk(KERN_DEBUG "max_low_pfn = %lx, highstart_pfn = %lx\n", 402 max_low_pfn, highstart_pfn); 403 404 printk(KERN_DEBUG "Low memory ends at vaddr %08lx\n", 405 (ulong) pfn_to_kaddr(max_low_pfn)); 406 for_each_online_node(nid) { 407 init_remap_allocator(nid); 408 409 allocate_pgdat(nid); 410 } 411 remap_numa_kva(); 412 413 printk(KERN_DEBUG "High memory starts at vaddr %08lx\n", 414 (ulong) pfn_to_kaddr(highstart_pfn)); 415 for_each_online_node(nid) 416 propagate_e820_map_node(nid); 417 418 for_each_online_node(nid) { 419 memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); 420 NODE_DATA(nid)->node_id = nid; 421 } 422 423 setup_bootmem_allocator(); 424 } 425 426 #ifdef CONFIG_MEMORY_HOTPLUG 427 static int paddr_to_nid(u64 addr) 428 { 429 int nid; 430 unsigned long pfn = PFN_DOWN(addr); 431 432 for_each_node(nid) 433 if (node_start_pfn[nid] <= pfn && 434 pfn < node_end_pfn[nid]) 435 return nid; 436 437 return -1; 438 } 439 440 /* 441 * This function is used to ask node id BEFORE memmap and mem_section's 442 * initialization (pfn_to_nid() can't be used yet). 443 * If _PXM is not defined on ACPI's DSDT, node id must be found by this. 444 */ 445 int memory_add_physaddr_to_nid(u64 addr) 446 { 447 int nid = paddr_to_nid(addr); 448 return (nid >= 0) ? nid : 0; 449 } 450 451 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); 452 #endif 453 454