Commit | Line | Data |
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1da177e4 LT |
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 | ||
1da177e4 LT |
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> | |
129f6946 | 31 | #include <linux/module.h> |
1bc3b91a | 32 | #include <linux/kexec.h> |
22a9835c | 33 | #include <linux/pfn.h> |
28aa483f | 34 | #include <linux/swap.h> |
1b000a5d | 35 | #include <linux/acpi.h> |
1bc3b91a | 36 | |
1da177e4 LT |
37 | #include <asm/e820.h> |
38 | #include <asm/setup.h> | |
39 | #include <asm/mmzone.h> | |
ce3fe6b2 | 40 | #include <asm/bios_ebda.h> |
287572cb | 41 | #include <asm/proto.h> |
1da177e4 | 42 | |
6c231b7b | 43 | struct pglist_data *node_data[MAX_NUMNODES] __read_mostly; |
129f6946 | 44 | EXPORT_SYMBOL(node_data); |
1da177e4 LT |
45 | |
46 | /* | |
d254c8f7 | 47 | * numa interface - we expect the numa architecture specific code to have |
1da177e4 LT |
48 | * populated the following initialisation. |
49 | * | |
50 | * 1) node_online_map - the map of all nodes configured (online) in the system | |
05b79bdc | 51 | * 2) node_start_pfn - the starting page frame number for a node |
1da177e4 LT |
52 | * 3) node_end_pfn - the ending page fram number for a node |
53 | */ | |
6c231b7b RT |
54 | unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly; |
55 | unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly; | |
05b79bdc | 56 | |
1da177e4 | 57 | |
05b79bdc | 58 | #ifdef CONFIG_DISCONTIGMEM |
1da177e4 | 59 | /* |
05b79bdc | 60 | * 4) physnode_map - the mapping between a pfn and owning node |
1da177e4 | 61 | * physnode_map keeps track of the physical memory layout of a generic |
ba924c81 YL |
62 | * numa node on a 64Mb break (each element of the array will |
63 | * represent 64Mb of memory and will be marked by the node id. so, | |
1da177e4 LT |
64 | * if the first gig is on node 0, and the second gig is on node 1 |
65 | * physnode_map will contain: | |
66 | * | |
ba924c81 YL |
67 | * physnode_map[0-15] = 0; |
68 | * physnode_map[16-31] = 1; | |
69 | * physnode_map[32- ] = -1; | |
1da177e4 | 70 | */ |
6c231b7b | 71 | s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1}; |
129f6946 | 72 | EXPORT_SYMBOL(physnode_map); |
1da177e4 LT |
73 | |
74 | void memory_present(int nid, unsigned long start, unsigned long end) | |
75 | { | |
76 | unsigned long pfn; | |
77 | ||
c0943457 | 78 | printk(KERN_INFO "Node: %d, start_pfn: %lx, end_pfn: %lx\n", |
1da177e4 LT |
79 | nid, start, end); |
80 | printk(KERN_DEBUG " Setting physnode_map array to node %d for pfns:\n", nid); | |
81 | printk(KERN_DEBUG " "); | |
82 | for (pfn = start; pfn < end; pfn += PAGES_PER_ELEMENT) { | |
83 | physnode_map[pfn / PAGES_PER_ELEMENT] = nid; | |
c0943457 | 84 | printk(KERN_CONT "%lx ", pfn); |
1da177e4 | 85 | } |
ba924c81 | 86 | printk(KERN_CONT "\n"); |
1da177e4 LT |
87 | } |
88 | ||
89 | unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn, | |
90 | unsigned long end_pfn) | |
91 | { | |
92 | unsigned long nr_pages = end_pfn - start_pfn; | |
93 | ||
94 | if (!nr_pages) | |
95 | return 0; | |
96 | ||
97 | return (nr_pages + 1) * sizeof(struct page); | |
98 | } | |
05b79bdc | 99 | #endif |
1da177e4 LT |
100 | |
101 | extern unsigned long find_max_low_pfn(void); | |
1da177e4 | 102 | extern unsigned long highend_pfn, highstart_pfn; |
1da177e4 LT |
103 | |
104 | #define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE) | |
105 | ||
1da177e4 | 106 | unsigned long node_remap_size[MAX_NUMNODES]; |
59659f14 | 107 | static void *node_remap_start_vaddr[MAX_NUMNODES]; |
1da177e4 LT |
108 | void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags); |
109 | ||
91023300 | 110 | static unsigned long kva_start_pfn; |
111 | static unsigned long kva_pages; | |
1da177e4 LT |
112 | /* |
113 | * FLAT - support for basic PC memory model with discontig enabled, essentially | |
114 | * a single node with all available processors in it with a flat | |
115 | * memory map. | |
116 | */ | |
117 | int __init get_memcfg_numa_flat(void) | |
118 | { | |
c0943457 | 119 | printk(KERN_DEBUG "NUMA - single node, flat memory mode\n"); |
1da177e4 | 120 | |
1da177e4 LT |
121 | node_start_pfn[0] = 0; |
122 | node_end_pfn[0] = max_pfn; | |
7b2a0a6c | 123 | e820_register_active_regions(0, 0, max_pfn); |
1da177e4 | 124 | memory_present(0, 0, max_pfn); |
b66cd720 | 125 | node_remap_size[0] = node_memmap_size_bytes(0, 0, max_pfn); |
1da177e4 LT |
126 | |
127 | /* Indicate there is one node available. */ | |
128 | nodes_clear(node_online_map); | |
129 | node_set_online(0); | |
130 | return 1; | |
131 | } | |
132 | ||
133 | /* | |
134 | * Find the highest page frame number we have available for the node | |
135 | */ | |
fa5c4639 | 136 | static void __init propagate_e820_map_node(int nid) |
1da177e4 LT |
137 | { |
138 | if (node_end_pfn[nid] > max_pfn) | |
139 | node_end_pfn[nid] = max_pfn; | |
140 | /* | |
141 | * if a user has given mem=XXXX, then we need to make sure | |
142 | * that the node _starts_ before that, too, not just ends | |
143 | */ | |
144 | if (node_start_pfn[nid] > max_pfn) | |
145 | node_start_pfn[nid] = max_pfn; | |
8d8f3cbe | 146 | BUG_ON(node_start_pfn[nid] > node_end_pfn[nid]); |
1da177e4 LT |
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 | */ | |
156 | static void __init allocate_pgdat(int nid) | |
157 | { | |
996cf443 YL |
158 | char buf[16]; |
159 | ||
160 | if (node_has_online_mem(nid) && node_remap_start_vaddr[nid]) | |
1da177e4 LT |
161 | NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid]; |
162 | else { | |
16387295 YL |
163 | unsigned long pgdat_phys; |
164 | pgdat_phys = find_e820_area(min_low_pfn<<PAGE_SHIFT, | |
996cf443 | 165 | max_pfn_mapped<<PAGE_SHIFT, |
6af61a76 | 166 | sizeof(pg_data_t), |
16387295 YL |
167 | PAGE_SIZE); |
168 | NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(pgdat_phys>>PAGE_SHIFT)); | |
996cf443 YL |
169 | memset(buf, 0, sizeof(buf)); |
170 | sprintf(buf, "NODE_DATA %d", nid); | |
171 | reserve_early(pgdat_phys, pgdat_phys + sizeof(pg_data_t), buf); | |
1da177e4 | 172 | } |
e8c27ac9 YL |
173 | printk(KERN_DEBUG "allocate_pgdat: node %d NODE_DATA %08lx\n", |
174 | nid, (unsigned long)NODE_DATA(nid)); | |
1da177e4 LT |
175 | } |
176 | ||
1b000a5d | 177 | /* |
b9ada428 AW |
178 | * In the DISCONTIGMEM and SPARSEMEM memory model, a portion of the kernel |
179 | * virtual address space (KVA) is reserved and portions of nodes are mapped | |
180 | * using it. This is to allow node-local memory to be allocated for | |
181 | * structures that would normally require ZONE_NORMAL. The memory is | |
182 | * allocated with alloc_remap() and callers should be prepared to allocate | |
183 | * from the bootmem allocator instead. | |
1b000a5d MG |
184 | */ |
185 | static unsigned long node_remap_start_pfn[MAX_NUMNODES]; | |
186 | static void *node_remap_end_vaddr[MAX_NUMNODES]; | |
187 | static void *node_remap_alloc_vaddr[MAX_NUMNODES]; | |
188 | static unsigned long node_remap_offset[MAX_NUMNODES]; | |
189 | ||
6f167ec7 DH |
190 | void *alloc_remap(int nid, unsigned long size) |
191 | { | |
192 | void *allocation = node_remap_alloc_vaddr[nid]; | |
193 | ||
194 | size = ALIGN(size, L1_CACHE_BYTES); | |
195 | ||
196 | if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid]) | |
2366c298 | 197 | return NULL; |
6f167ec7 DH |
198 | |
199 | node_remap_alloc_vaddr[nid] += size; | |
200 | memset(allocation, 0, size); | |
201 | ||
202 | return allocation; | |
203 | } | |
204 | ||
3a58a2a6 | 205 | static void __init remap_numa_kva(void) |
1da177e4 LT |
206 | { |
207 | void *vaddr; | |
208 | unsigned long pfn; | |
209 | int node; | |
210 | ||
211 | for_each_online_node(node) { | |
e8c27ac9 | 212 | printk(KERN_DEBUG "remap_numa_kva: node %d\n", node); |
1da177e4 LT |
213 | for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) { |
214 | vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT); | |
e8c27ac9 YL |
215 | printk(KERN_DEBUG "remap_numa_kva: %08lx to pfn %08lx\n", |
216 | (unsigned long)vaddr, | |
217 | node_remap_start_pfn[node] + pfn); | |
1da177e4 LT |
218 | set_pmd_pfn((ulong) vaddr, |
219 | node_remap_start_pfn[node] + pfn, | |
220 | PAGE_KERNEL_LARGE); | |
221 | } | |
222 | } | |
223 | } | |
224 | ||
97a70e54 RW |
225 | #ifdef CONFIG_HIBERNATION |
226 | /** | |
227 | * resume_map_numa_kva - add KVA mapping to the temporary page tables created | |
228 | * during resume from hibernation | |
229 | * @pgd_base - temporary resume page directory | |
230 | */ | |
231 | void resume_map_numa_kva(pgd_t *pgd_base) | |
232 | { | |
233 | int node; | |
234 | ||
235 | for_each_online_node(node) { | |
236 | unsigned long start_va, start_pfn, size, pfn; | |
237 | ||
238 | start_va = (unsigned long)node_remap_start_vaddr[node]; | |
239 | start_pfn = node_remap_start_pfn[node]; | |
240 | size = node_remap_size[node]; | |
241 | ||
9b4778f6 | 242 | printk(KERN_DEBUG "%s: node %d\n", __func__, node); |
97a70e54 RW |
243 | |
244 | for (pfn = 0; pfn < size; pfn += PTRS_PER_PTE) { | |
245 | unsigned long vaddr = start_va + (pfn << PAGE_SHIFT); | |
246 | pgd_t *pgd = pgd_base + pgd_index(vaddr); | |
247 | pud_t *pud = pud_offset(pgd, vaddr); | |
248 | pmd_t *pmd = pmd_offset(pud, vaddr); | |
249 | ||
250 | set_pmd(pmd, pfn_pmd(start_pfn + pfn, | |
251 | PAGE_KERNEL_LARGE_EXEC)); | |
252 | ||
253 | printk(KERN_DEBUG "%s: %08lx -> pfn %08lx\n", | |
9b4778f6 | 254 | __func__, vaddr, start_pfn + pfn); |
97a70e54 RW |
255 | } |
256 | } | |
257 | } | |
258 | #endif | |
259 | ||
a81b6314 | 260 | static __init unsigned long calculate_numa_remap_pages(void) |
1da177e4 LT |
261 | { |
262 | int nid; | |
263 | unsigned long size, reserve_pages = 0; | |
264 | ||
265 | for_each_online_node(nid) { | |
cc1050ba YL |
266 | u64 node_kva_target; |
267 | u64 node_kva_final; | |
4cfee88a | 268 | |
1da177e4 LT |
269 | /* |
270 | * The acpi/srat node info can show hot-add memroy zones | |
271 | * where memory could be added but not currently present. | |
272 | */ | |
c0943457 | 273 | printk(KERN_DEBUG "node %d pfn: [%lx - %lx]\n", |
9043f007 | 274 | nid, node_start_pfn[nid], node_end_pfn[nid]); |
1da177e4 LT |
275 | if (node_start_pfn[nid] > max_pfn) |
276 | continue; | |
9043f007 YL |
277 | if (!node_end_pfn[nid]) |
278 | continue; | |
1da177e4 LT |
279 | if (node_end_pfn[nid] > max_pfn) |
280 | node_end_pfn[nid] = max_pfn; | |
281 | ||
282 | /* ensure the remap includes space for the pgdat. */ | |
283 | size = node_remap_size[nid] + sizeof(pg_data_t); | |
284 | ||
285 | /* convert size to large (pmd size) pages, rounding up */ | |
286 | size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES; | |
287 | /* now the roundup is correct, convert to PAGE_SIZE pages */ | |
288 | size = size * PTRS_PER_PTE; | |
5b505b90 | 289 | |
cc1050ba | 290 | node_kva_target = round_down(node_end_pfn[nid] - size, |
9043f007 | 291 | PTRS_PER_PTE); |
cc1050ba | 292 | node_kva_target <<= PAGE_SHIFT; |
9043f007 | 293 | do { |
cc1050ba | 294 | node_kva_final = find_e820_area(node_kva_target, |
9043f007 YL |
295 | ((u64)node_end_pfn[nid])<<PAGE_SHIFT, |
296 | ((u64)size)<<PAGE_SHIFT, | |
297 | LARGE_PAGE_BYTES); | |
cc1050ba YL |
298 | node_kva_target -= LARGE_PAGE_BYTES; |
299 | } while (node_kva_final == -1ULL && | |
300 | (node_kva_target>>PAGE_SHIFT) > (node_start_pfn[nid])); | |
9043f007 | 301 | |
cc1050ba | 302 | if (node_kva_final == -1ULL) |
9043f007 | 303 | panic("Can not get kva ram\n"); |
5b505b90 | 304 | |
1da177e4 | 305 | node_remap_size[nid] = size; |
1da177e4 | 306 | node_remap_offset[nid] = reserve_pages; |
6f167ec7 | 307 | reserve_pages += size; |
c0943457 YL |
308 | printk(KERN_DEBUG "Reserving %ld pages of KVA for lmem_map of" |
309 | " node %d at %llx\n", | |
cc1050ba | 310 | size, nid, node_kva_final>>PAGE_SHIFT); |
9043f007 YL |
311 | |
312 | /* | |
313 | * prevent kva address below max_low_pfn want it on system | |
314 | * with less memory later. | |
315 | * layout will be: KVA address , KVA RAM | |
cc1050ba YL |
316 | * |
317 | * we are supposed to only record the one less then max_low_pfn | |
318 | * but we could have some hole in high memory, and it will only | |
319 | * check page_is_ram(pfn) && !page_is_reserved_early(pfn) to decide | |
320 | * to use it as free. | |
321 | * So reserve_early here, hope we don't run out of that array | |
9043f007 | 322 | */ |
cc1050ba YL |
323 | reserve_early(node_kva_final, |
324 | node_kva_final+(((u64)size)<<PAGE_SHIFT), | |
325 | "KVA RAM"); | |
4b0271eb | 326 | |
cc1050ba YL |
327 | node_remap_start_pfn[nid] = node_kva_final>>PAGE_SHIFT; |
328 | remove_active_range(nid, node_remap_start_pfn[nid], | |
329 | node_remap_start_pfn[nid] + size); | |
1da177e4 | 330 | } |
c0943457 | 331 | printk(KERN_INFO "Reserving total of %lx pages for numa KVA remap\n", |
1da177e4 LT |
332 | reserve_pages); |
333 | return reserve_pages; | |
334 | } | |
335 | ||
1b000a5d MG |
336 | static void init_remap_allocator(int nid) |
337 | { | |
338 | node_remap_start_vaddr[nid] = pfn_to_kaddr( | |
339 | kva_start_pfn + node_remap_offset[nid]); | |
340 | node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] + | |
341 | (node_remap_size[nid] * PAGE_SIZE); | |
342 | node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] + | |
343 | ALIGN(sizeof(pg_data_t), PAGE_SIZE); | |
344 | ||
c0943457 | 345 | printk(KERN_DEBUG "node %d will remap to vaddr %08lx - %08lx\n", nid, |
1b000a5d | 346 | (ulong) node_remap_start_vaddr[nid], |
e8c27ac9 | 347 | (ulong) node_remap_end_vaddr[nid]); |
1b000a5d | 348 | } |
1b000a5d | 349 | |
2ec65f8b | 350 | void __init initmem_init(unsigned long start_pfn, |
b2ac82a0 | 351 | unsigned long end_pfn) |
1da177e4 LT |
352 | { |
353 | int nid; | |
84b56fa4 | 354 | long kva_target_pfn; |
1da177e4 LT |
355 | |
356 | /* | |
357 | * When mapping a NUMA machine we allocate the node_mem_map arrays | |
358 | * from node local memory. They are then mapped directly into KVA | |
359 | * between zone normal and vmalloc space. Calculate the size of | |
27b46d76 | 360 | * this space and use it to adjust the boundary between ZONE_NORMAL |
1da177e4 LT |
361 | * and ZONE_HIGHMEM. |
362 | */ | |
7b2a0a6c | 363 | |
1da177e4 LT |
364 | get_memcfg_numa(); |
365 | ||
17f3ab74 | 366 | kva_pages = roundup(calculate_numa_remap_pages(), PTRS_PER_PTE); |
1da177e4 | 367 | |
84b56fa4 YL |
368 | kva_target_pfn = round_down(max_low_pfn - kva_pages, PTRS_PER_PTE); |
369 | do { | |
370 | kva_start_pfn = find_e820_area(kva_target_pfn<<PAGE_SHIFT, | |
371 | max_low_pfn<<PAGE_SHIFT, | |
372 | kva_pages<<PAGE_SHIFT, | |
373 | PTRS_PER_PTE<<PAGE_SHIFT) >> PAGE_SHIFT; | |
374 | kva_target_pfn -= PTRS_PER_PTE; | |
375 | } while (kva_start_pfn == -1UL && kva_target_pfn > min_low_pfn); | |
bac4894d | 376 | |
84b56fa4 YL |
377 | if (kva_start_pfn == -1UL) |
378 | panic("Can not get kva space\n"); | |
91023300 | 379 | |
c0943457 | 380 | printk(KERN_INFO "kva_start_pfn ~ %lx max_low_pfn ~ %lx\n", |
91023300 | 381 | kva_start_pfn, max_low_pfn); |
c0943457 | 382 | printk(KERN_INFO "max_pfn = %lx\n", max_pfn); |
a5481280 YL |
383 | |
384 | /* avoid clash with initrd */ | |
385 | reserve_early(kva_start_pfn<<PAGE_SHIFT, | |
386 | (kva_start_pfn + kva_pages)<<PAGE_SHIFT, | |
387 | "KVA PG"); | |
1da177e4 LT |
388 | #ifdef CONFIG_HIGHMEM |
389 | highstart_pfn = highend_pfn = max_pfn; | |
2ec65f8b YL |
390 | if (max_pfn > max_low_pfn) |
391 | highstart_pfn = max_low_pfn; | |
1da177e4 LT |
392 | printk(KERN_NOTICE "%ldMB HIGHMEM available.\n", |
393 | pages_to_mb(highend_pfn - highstart_pfn)); | |
ba9c231f JB |
394 | num_physpages = highend_pfn; |
395 | high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1; | |
396 | #else | |
2ec65f8b YL |
397 | num_physpages = max_low_pfn; |
398 | high_memory = (void *) __va(max_low_pfn * PAGE_SIZE - 1) + 1; | |
1da177e4 LT |
399 | #endif |
400 | printk(KERN_NOTICE "%ldMB LOWMEM available.\n", | |
2ec65f8b | 401 | pages_to_mb(max_low_pfn)); |
c0943457 YL |
402 | printk(KERN_DEBUG "max_low_pfn = %lx, highstart_pfn = %lx\n", |
403 | max_low_pfn, highstart_pfn); | |
1da177e4 | 404 | |
c0943457 | 405 | printk(KERN_DEBUG "Low memory ends at vaddr %08lx\n", |
1da177e4 LT |
406 | (ulong) pfn_to_kaddr(max_low_pfn)); |
407 | for_each_online_node(nid) { | |
1b000a5d | 408 | init_remap_allocator(nid); |
6f167ec7 | 409 | |
1da177e4 | 410 | allocate_pgdat(nid); |
1da177e4 | 411 | } |
3a58a2a6 YL |
412 | remap_numa_kva(); |
413 | ||
c0943457 | 414 | printk(KERN_DEBUG "High memory starts at vaddr %08lx\n", |
1da177e4 | 415 | (ulong) pfn_to_kaddr(highstart_pfn)); |
1da177e4 | 416 | for_each_online_node(nid) |
fa5c4639 | 417 | propagate_e820_map_node(nid); |
1da177e4 | 418 | |
a71edd1f | 419 | for_each_online_node(nid) { |
3a58a2a6 | 420 | memset(NODE_DATA(nid), 0, sizeof(struct pglist_data)); |
a71edd1f YL |
421 | NODE_DATA(nid)->bdata = &bootmem_node_data[nid]; |
422 | } | |
3a58a2a6 | 423 | |
1da177e4 | 424 | setup_bootmem_allocator(); |
1da177e4 LT |
425 | } |
426 | ||
7c7e9425 | 427 | #ifdef CONFIG_MEMORY_HOTPLUG |
fb8c177f | 428 | static int paddr_to_nid(u64 addr) |
7c7e9425 YG |
429 | { |
430 | int nid; | |
431 | unsigned long pfn = PFN_DOWN(addr); | |
432 | ||
433 | for_each_node(nid) | |
434 | if (node_start_pfn[nid] <= pfn && | |
435 | pfn < node_end_pfn[nid]) | |
436 | return nid; | |
437 | ||
438 | return -1; | |
439 | } | |
440 | ||
441 | /* | |
442 | * This function is used to ask node id BEFORE memmap and mem_section's | |
443 | * initialization (pfn_to_nid() can't be used yet). | |
444 | * If _PXM is not defined on ACPI's DSDT, node id must be found by this. | |
445 | */ | |
446 | int memory_add_physaddr_to_nid(u64 addr) | |
447 | { | |
448 | int nid = paddr_to_nid(addr); | |
449 | return (nid >= 0) ? nid : 0; | |
450 | } | |
451 | ||
452 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); | |
453 | #endif | |
2772f54b | 454 |