kbuild: introduce __init_refok/__initdata_refok to supress section mismatch warnings
[linux-2.6/sactl.git] / arch / i386 / mm / discontig.c
blob860e912a3fbb4471ec5b683542b3dfa7c71598d4
1 /*
2 * Written by: Patricia Gaughen <gone@us.ibm.com>, IBM Corporation
3 * August 2002: added remote node KVA remap - Martin J. Bligh
5 * Copyright (C) 2002, IBM Corp.
7 * All rights reserved.
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.
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.
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.
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>
36 #include <asm/e820.h>
37 #include <asm/setup.h>
38 #include <asm/mmzone.h>
39 #include <bios_ebda.h>
41 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
42 EXPORT_SYMBOL(node_data);
43 bootmem_data_t node0_bdata;
46 * numa interface - we expect the numa architecture specific code to have
47 * populated the following initialisation.
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
53 unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly;
54 unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly;
57 #ifdef CONFIG_DISCONTIGMEM
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:
66 * physnode_map[0-3] = 0;
67 * physnode_map[4-7] = 1;
68 * physnode_map[8- ] = -1;
70 s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1};
71 EXPORT_SYMBOL(physnode_map);
73 void memory_present(int nid, unsigned long start, unsigned long end)
75 unsigned long pfn;
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);
85 printk("\n");
88 unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
89 unsigned long end_pfn)
91 unsigned long nr_pages = end_pfn - start_pfn;
93 if (!nr_pages)
94 return 0;
96 return (nr_pages + 1) * sizeof(struct page);
98 #endif
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;
104 #define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE)
106 unsigned long node_remap_start_pfn[MAX_NUMNODES];
107 unsigned long node_remap_size[MAX_NUMNODES];
108 unsigned long node_remap_offset[MAX_NUMNODES];
109 void *node_remap_start_vaddr[MAX_NUMNODES];
110 void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
112 void *node_remap_end_vaddr[MAX_NUMNODES];
113 void *node_remap_alloc_vaddr[MAX_NUMNODES];
114 static unsigned long kva_start_pfn;
115 static unsigned long kva_pages;
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.
121 int __init get_memcfg_numa_flat(void)
123 printk("NUMA - single node, flat memory mode\n");
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);
131 /* Indicate there is one node available. */
132 nodes_clear(node_online_map);
133 node_set_online(0);
134 return 1;
138 * Find the highest page frame number we have available for the node
140 static void __init find_max_pfn_node(int nid)
142 if (node_end_pfn[nid] > max_pfn)
143 node_end_pfn[nid] = max_pfn;
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
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]);
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.
160 static void __init allocate_pgdat(int nid)
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));
170 void *alloc_remap(int nid, unsigned long size)
172 void *allocation = node_remap_alloc_vaddr[nid];
174 size = ALIGN(size, L1_CACHE_BYTES);
176 if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid])
177 return 0;
179 node_remap_alloc_vaddr[nid] += size;
180 memset(allocation, 0, size);
182 return allocation;
185 void __init remap_numa_kva(void)
187 void *vaddr;
188 unsigned long pfn;
189 int node;
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);
201 static unsigned long calculate_numa_remap_pages(void)
203 int nid;
204 unsigned long size, reserve_pages = 0;
205 unsigned long pfn;
207 for_each_online_node(nid) {
208 unsigned old_end_pfn = node_end_pfn[nid];
211 * The acpi/srat node info can show hot-add memroy zones
212 * where memory could be added but not currently present.
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;
219 /* ensure the remap includes space for the pgdat. */
220 size = node_remap_size[nid] + sizeof(pg_data_t);
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;
228 * Validate the region we are allocating only contains valid
229 * pages.
231 for (pfn = node_end_pfn[nid] - size;
232 pfn < node_end_pfn[nid]; pfn++)
233 if (!page_is_ram(pfn))
234 break;
236 if (pfn != node_end_pfn[nid])
237 size = 0;
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);
247 if (node_end_pfn[nid] & (PTRS_PER_PTE-1)) {
249 * Align node_end_pfn[] and node_remap_start_pfn[] to
250 * pmd boundary. remap_numa_kva will barf otherwise.
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);
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]);
261 printk("Reserving total of %ld pages for numa KVA remap\n",
262 reserve_pages);
263 return reserve_pages;
266 extern void setup_bootmem_allocator(void);
267 unsigned long __init setup_memory(void)
269 int nid;
270 unsigned long system_start_pfn, system_max_low_pfn;
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 boundry between ZONE_NORMAL
277 * and ZONE_HIGHMEM.
279 find_max_pfn();
280 get_memcfg_numa();
282 kva_pages = calculate_numa_remap_pages();
284 /* partially used pages are not usable - thus round upwards */
285 system_start_pfn = min_low_pfn = PFN_UP(init_pg_tables_end);
287 kva_start_pfn = find_max_low_pfn() - kva_pages;
289 #ifdef CONFIG_BLK_DEV_INITRD
290 /* Numa kva area is below the initrd */
291 if (LOADER_TYPE && INITRD_START)
292 kva_start_pfn = PFN_DOWN(INITRD_START) - kva_pages;
293 #endif
294 kva_start_pfn -= kva_start_pfn & (PTRS_PER_PTE-1);
296 system_max_low_pfn = max_low_pfn = find_max_low_pfn();
297 printk("kva_start_pfn ~ %ld find_max_low_pfn() ~ %ld\n",
298 kva_start_pfn, max_low_pfn);
299 printk("max_pfn = %ld\n", max_pfn);
300 #ifdef CONFIG_HIGHMEM
301 highstart_pfn = highend_pfn = max_pfn;
302 if (max_pfn > system_max_low_pfn)
303 highstart_pfn = system_max_low_pfn;
304 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
305 pages_to_mb(highend_pfn - highstart_pfn));
306 num_physpages = highend_pfn;
307 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
308 #else
309 num_physpages = system_max_low_pfn;
310 high_memory = (void *) __va(system_max_low_pfn * PAGE_SIZE - 1) + 1;
311 #endif
312 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
313 pages_to_mb(system_max_low_pfn));
314 printk("min_low_pfn = %ld, max_low_pfn = %ld, highstart_pfn = %ld\n",
315 min_low_pfn, max_low_pfn, highstart_pfn);
317 printk("Low memory ends at vaddr %08lx\n",
318 (ulong) pfn_to_kaddr(max_low_pfn));
319 for_each_online_node(nid) {
320 node_remap_start_vaddr[nid] = pfn_to_kaddr(
321 kva_start_pfn + node_remap_offset[nid]);
322 /* Init the node remap allocator */
323 node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] +
324 (node_remap_size[nid] * PAGE_SIZE);
325 node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] +
326 ALIGN(sizeof(pg_data_t), PAGE_SIZE);
328 allocate_pgdat(nid);
329 printk ("node %d will remap to vaddr %08lx - %08lx\n", nid,
330 (ulong) node_remap_start_vaddr[nid],
331 (ulong) pfn_to_kaddr(highstart_pfn
332 + node_remap_offset[nid] + node_remap_size[nid]));
334 printk("High memory starts at vaddr %08lx\n",
335 (ulong) pfn_to_kaddr(highstart_pfn));
336 for_each_online_node(nid)
337 find_max_pfn_node(nid);
339 memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
340 NODE_DATA(0)->bdata = &node0_bdata;
341 setup_bootmem_allocator();
342 return max_low_pfn;
345 void __init numa_kva_reserve(void)
347 reserve_bootmem(PFN_PHYS(kva_start_pfn),PFN_PHYS(kva_pages));
350 void __init zone_sizes_init(void)
352 int nid;
353 unsigned long max_zone_pfns[MAX_NR_ZONES];
354 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
355 max_zone_pfns[ZONE_DMA] =
356 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
357 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
358 #ifdef CONFIG_HIGHMEM
359 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
360 #endif
362 /* If SRAT has not registered memory, register it now */
363 if (find_max_pfn_with_active_regions() == 0) {
364 for_each_online_node(nid) {
365 if (node_has_online_mem(nid))
366 add_active_range(nid, node_start_pfn[nid],
367 node_end_pfn[nid]);
371 free_area_init_nodes(max_zone_pfns);
372 return;
375 void __init set_highmem_pages_init(int bad_ppro)
377 #ifdef CONFIG_HIGHMEM
378 struct zone *zone;
379 struct page *page;
381 for_each_zone(zone) {
382 unsigned long node_pfn, zone_start_pfn, zone_end_pfn;
384 if (!is_highmem(zone))
385 continue;
387 zone_start_pfn = zone->zone_start_pfn;
388 zone_end_pfn = zone_start_pfn + zone->spanned_pages;
390 printk("Initializing %s for node %d (%08lx:%08lx)\n",
391 zone->name, zone_to_nid(zone),
392 zone_start_pfn, zone_end_pfn);
394 for (node_pfn = zone_start_pfn; node_pfn < zone_end_pfn; node_pfn++) {
395 if (!pfn_valid(node_pfn))
396 continue;
397 page = pfn_to_page(node_pfn);
398 add_one_highpage_init(page, node_pfn, bad_ppro);
401 totalram_pages += totalhigh_pages;
402 #endif
405 #ifdef CONFIG_MEMORY_HOTPLUG
406 int paddr_to_nid(u64 addr)
408 int nid;
409 unsigned long pfn = PFN_DOWN(addr);
411 for_each_node(nid)
412 if (node_start_pfn[nid] <= pfn &&
413 pfn < node_end_pfn[nid])
414 return nid;
416 return -1;
420 * This function is used to ask node id BEFORE memmap and mem_section's
421 * initialization (pfn_to_nid() can't be used yet).
422 * If _PXM is not defined on ACPI's DSDT, node id must be found by this.
424 int memory_add_physaddr_to_nid(u64 addr)
426 int nid = paddr_to_nid(addr);
427 return (nid >= 0) ? nid : 0;
430 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
431 #endif