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.
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
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.
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 #include <linux/acpi.h>
38 #include <asm/setup.h>
39 #include <asm/mmzone.h>
40 #include <asm/bios_ebda.h>
42 struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
43 EXPORT_SYMBOL(node_data);
44 static bootmem_data_t node0_bdata;
47 * numa interface - we expect the numa architecture specific code to have
48 * populated the following initialisation.
50 * 1) node_online_map - the map of all nodes configured (online) in the system
51 * 2) node_start_pfn - the starting page frame number for a node
52 * 3) node_end_pfn - the ending page fram number for a node
54 unsigned long node_start_pfn[MAX_NUMNODES] __read_mostly;
55 unsigned long node_end_pfn[MAX_NUMNODES] __read_mostly;
58 #ifdef CONFIG_DISCONTIGMEM
60 * 4) physnode_map - the mapping between a pfn and owning node
61 * physnode_map keeps track of the physical memory layout of a generic
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,
64 * if the first gig is on node 0, and the second gig is on node 1
65 * physnode_map will contain:
67 * physnode_map[0-15] = 0;
68 * physnode_map[16-31] = 1;
69 * physnode_map[32- ] = -1;
71 s8 physnode_map[MAX_ELEMENTS] __read_mostly = { [0 ... (MAX_ELEMENTS - 1)] = -1};
72 EXPORT_SYMBOL(physnode_map);
74 void memory_present(int nid, unsigned long start, unsigned long end)
78 printk(KERN_INFO "Node: %d, start_pfn: %ld, end_pfn: %ld\n",
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;
84 printk(KERN_CONT "%ld ", pfn);
86 printk(KERN_CONT "\n");
89 unsigned long node_memmap_size_bytes(int nid, unsigned long start_pfn,
90 unsigned long end_pfn)
92 unsigned long nr_pages = end_pfn - start_pfn;
97 return (nr_pages + 1) * sizeof(struct page);
101 extern unsigned long find_max_low_pfn(void);
102 extern void add_one_highpage_init(struct page *, int, int);
103 extern unsigned long highend_pfn, highstart_pfn;
105 #define LARGE_PAGE_BYTES (PTRS_PER_PTE * PAGE_SIZE)
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);
111 static unsigned long kva_start_pfn;
112 static unsigned long kva_pages;
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
118 int __init get_memcfg_numa_flat(void)
120 printk("NUMA - single node, flat memory mode\n");
122 /* Run the memory configuration and find the top of memory. */
124 node_start_pfn[0] = 0;
125 node_end_pfn[0] = max_pfn;
126 memory_present(0, 0, max_pfn);
127 node_remap_size[0] = node_memmap_size_bytes(0, 0, max_pfn);
129 /* Indicate there is one node available. */
130 nodes_clear(node_online_map);
136 * Find the highest page frame number we have available for the node
138 static void __init propagate_e820_map_node(int nid)
140 if (node_end_pfn[nid] > max_pfn)
141 node_end_pfn[nid] = max_pfn;
143 * if a user has given mem=XXXX, then we need to make sure
144 * that the node _starts_ before that, too, not just ends
146 if (node_start_pfn[nid] > max_pfn)
147 node_start_pfn[nid] = max_pfn;
148 BUG_ON(node_start_pfn[nid] > node_end_pfn[nid]);
152 * Allocate memory for the pg_data_t for this node via a crude pre-bootmem
153 * method. For node zero take this from the bottom of memory, for
154 * subsequent nodes place them at node_remap_start_vaddr which contains
155 * node local data in physically node local memory. See setup_memory()
158 static void __init allocate_pgdat(int nid)
160 if (nid && node_has_online_mem(nid))
161 NODE_DATA(nid) = (pg_data_t *)node_remap_start_vaddr[nid];
163 unsigned long pgdat_phys;
164 pgdat_phys = find_e820_area(min_low_pfn<<PAGE_SHIFT,
165 max_low_pfn<<PAGE_SHIFT, sizeof(pg_data_t),
167 NODE_DATA(nid) = (pg_data_t *)(pfn_to_kaddr(pgdat_phys>>PAGE_SHIFT));
168 reserve_early(pgdat_phys, pgdat_phys + sizeof(pg_data_t),
173 #ifdef CONFIG_DISCONTIGMEM
175 * In the discontig memory model, a portion of the kernel virtual area (KVA)
176 * is reserved and portions of nodes are mapped using it. This is to allow
177 * node-local memory to be allocated for structures that would normally require
178 * ZONE_NORMAL. The memory is allocated with alloc_remap() and callers
179 * should be prepared to allocate from the bootmem allocator instead. This KVA
180 * mechanism is incompatible with SPARSEMEM as it makes assumptions about the
181 * layout of memory that are broken if alloc_remap() succeeds for some of the
182 * map and fails for others
184 static unsigned long node_remap_start_pfn[MAX_NUMNODES];
185 static void *node_remap_end_vaddr[MAX_NUMNODES];
186 static void *node_remap_alloc_vaddr[MAX_NUMNODES];
187 static unsigned long node_remap_offset[MAX_NUMNODES];
189 void *alloc_remap(int nid, unsigned long size)
191 void *allocation = node_remap_alloc_vaddr[nid];
193 size = ALIGN(size, L1_CACHE_BYTES);
195 if (!allocation || (allocation + size) >= node_remap_end_vaddr[nid])
198 node_remap_alloc_vaddr[nid] += size;
199 memset(allocation, 0, size);
204 void __init remap_numa_kva(void)
210 for_each_online_node(node) {
211 for (pfn=0; pfn < node_remap_size[node]; pfn += PTRS_PER_PTE) {
212 vaddr = node_remap_start_vaddr[node]+(pfn<<PAGE_SHIFT);
213 set_pmd_pfn((ulong) vaddr,
214 node_remap_start_pfn[node] + pfn,
220 static unsigned long calculate_numa_remap_pages(void)
223 unsigned long size, reserve_pages = 0;
226 for_each_online_node(nid) {
227 unsigned old_end_pfn = node_end_pfn[nid];
230 * The acpi/srat node info can show hot-add memroy zones
231 * where memory could be added but not currently present.
233 if (node_start_pfn[nid] > max_pfn)
235 if (node_end_pfn[nid] > max_pfn)
236 node_end_pfn[nid] = max_pfn;
238 /* ensure the remap includes space for the pgdat. */
239 size = node_remap_size[nid] + sizeof(pg_data_t);
241 /* convert size to large (pmd size) pages, rounding up */
242 size = (size + LARGE_PAGE_BYTES - 1) / LARGE_PAGE_BYTES;
243 /* now the roundup is correct, convert to PAGE_SIZE pages */
244 size = size * PTRS_PER_PTE;
247 * Validate the region we are allocating only contains valid
250 for (pfn = node_end_pfn[nid] - size;
251 pfn < node_end_pfn[nid]; pfn++)
252 if (!page_is_ram(pfn))
255 if (pfn != node_end_pfn[nid])
258 printk("Reserving %ld pages of KVA for lmem_map of node %d\n",
260 node_remap_size[nid] = size;
261 node_remap_offset[nid] = reserve_pages;
262 reserve_pages += size;
263 printk("Shrinking node %d from %ld pages to %ld pages\n",
264 nid, node_end_pfn[nid], node_end_pfn[nid] - size);
266 if (node_end_pfn[nid] & (PTRS_PER_PTE-1)) {
268 * Align node_end_pfn[] and node_remap_start_pfn[] to
269 * pmd boundary. remap_numa_kva will barf otherwise.
271 printk("Shrinking node %d further by %ld pages for proper alignment\n",
272 nid, node_end_pfn[nid] & (PTRS_PER_PTE-1));
273 size += node_end_pfn[nid] & (PTRS_PER_PTE-1);
276 node_end_pfn[nid] -= size;
277 node_remap_start_pfn[nid] = node_end_pfn[nid];
278 shrink_active_range(nid, old_end_pfn, node_end_pfn[nid]);
280 printk("Reserving total of %ld pages for numa KVA remap\n",
282 return reserve_pages;
285 static void init_remap_allocator(int nid)
287 node_remap_start_vaddr[nid] = pfn_to_kaddr(
288 kva_start_pfn + node_remap_offset[nid]);
289 node_remap_end_vaddr[nid] = node_remap_start_vaddr[nid] +
290 (node_remap_size[nid] * PAGE_SIZE);
291 node_remap_alloc_vaddr[nid] = node_remap_start_vaddr[nid] +
292 ALIGN(sizeof(pg_data_t), PAGE_SIZE);
294 printk ("node %d will remap to vaddr %08lx - %08lx\n", nid,
295 (ulong) node_remap_start_vaddr[nid],
296 (ulong) pfn_to_kaddr(highstart_pfn
297 + node_remap_offset[nid] + node_remap_size[nid]));
300 void *alloc_remap(int nid, unsigned long size)
305 static unsigned long calculate_numa_remap_pages(void)
310 static void init_remap_allocator(int nid)
314 void __init remap_numa_kva(void)
317 #endif /* CONFIG_DISCONTIGMEM */
319 extern void setup_bootmem_allocator(void);
320 unsigned long __init setup_memory(void)
323 unsigned long system_start_pfn, system_max_low_pfn;
324 unsigned long wasted_pages;
327 * When mapping a NUMA machine we allocate the node_mem_map arrays
328 * from node local memory. They are then mapped directly into KVA
329 * between zone normal and vmalloc space. Calculate the size of
330 * this space and use it to adjust the boundary between ZONE_NORMAL
335 kva_pages = calculate_numa_remap_pages();
337 /* partially used pages are not usable - thus round upwards */
338 system_start_pfn = min_low_pfn = PFN_UP(init_pg_tables_end);
340 kva_start_pfn = find_max_low_pfn() - kva_pages;
342 #ifdef CONFIG_BLK_DEV_INITRD
343 /* Numa kva area is below the initrd */
345 kva_start_pfn = PFN_DOWN(initrd_start - PAGE_OFFSET)
350 * We waste pages past at the end of the KVA for no good reason other
351 * than how it is located. This is bad.
353 wasted_pages = kva_start_pfn & (PTRS_PER_PTE-1);
354 kva_start_pfn -= wasted_pages;
355 kva_pages += wasted_pages;
357 system_max_low_pfn = max_low_pfn = find_max_low_pfn();
358 printk("kva_start_pfn ~ %ld find_max_low_pfn() ~ %ld\n",
359 kva_start_pfn, max_low_pfn);
360 printk("max_pfn = %ld\n", max_pfn);
362 /* avoid clash with initrd */
363 reserve_early(kva_start_pfn<<PAGE_SHIFT,
364 (kva_start_pfn + kva_pages)<<PAGE_SHIFT,
366 #ifdef CONFIG_HIGHMEM
367 highstart_pfn = highend_pfn = max_pfn;
368 if (max_pfn > system_max_low_pfn)
369 highstart_pfn = system_max_low_pfn;
370 printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
371 pages_to_mb(highend_pfn - highstart_pfn));
372 num_physpages = highend_pfn;
373 high_memory = (void *) __va(highstart_pfn * PAGE_SIZE - 1) + 1;
375 num_physpages = system_max_low_pfn;
376 high_memory = (void *) __va(system_max_low_pfn * PAGE_SIZE - 1) + 1;
378 printk(KERN_NOTICE "%ldMB LOWMEM available.\n",
379 pages_to_mb(system_max_low_pfn));
380 printk("min_low_pfn = %ld, max_low_pfn = %ld, highstart_pfn = %ld\n",
381 min_low_pfn, max_low_pfn, highstart_pfn);
383 printk("Low memory ends at vaddr %08lx\n",
384 (ulong) pfn_to_kaddr(max_low_pfn));
385 for_each_online_node(nid) {
386 init_remap_allocator(nid);
390 printk("High memory starts at vaddr %08lx\n",
391 (ulong) pfn_to_kaddr(highstart_pfn));
392 for_each_online_node(nid)
393 propagate_e820_map_node(nid);
395 memset(NODE_DATA(0), 0, sizeof(struct pglist_data));
396 NODE_DATA(0)->bdata = &node0_bdata;
397 setup_bootmem_allocator();
401 void __init zone_sizes_init(void)
404 unsigned long max_zone_pfns[MAX_NR_ZONES];
405 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
406 max_zone_pfns[ZONE_DMA] =
407 virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
408 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
409 #ifdef CONFIG_HIGHMEM
410 max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
413 /* If SRAT has not registered memory, register it now */
414 if (find_max_pfn_with_active_regions() == 0) {
415 for_each_online_node(nid) {
416 if (node_has_online_mem(nid))
417 add_active_range(nid, node_start_pfn[nid],
422 free_area_init_nodes(max_zone_pfns);
426 void __init set_highmem_pages_init(int bad_ppro)
428 #ifdef CONFIG_HIGHMEM
432 for_each_zone(zone) {
433 unsigned long node_pfn, zone_start_pfn, zone_end_pfn;
435 if (!is_highmem(zone))
438 zone_start_pfn = zone->zone_start_pfn;
439 zone_end_pfn = zone_start_pfn + zone->spanned_pages;
441 printk("Initializing %s for node %d (%08lx:%08lx)\n",
442 zone->name, zone_to_nid(zone),
443 zone_start_pfn, zone_end_pfn);
445 for (node_pfn = zone_start_pfn; node_pfn < zone_end_pfn; node_pfn++) {
446 if (!pfn_valid(node_pfn))
448 page = pfn_to_page(node_pfn);
449 add_one_highpage_init(page, node_pfn, bad_ppro);
452 totalram_pages += totalhigh_pages;
456 #ifdef CONFIG_MEMORY_HOTPLUG
457 static int paddr_to_nid(u64 addr)
460 unsigned long pfn = PFN_DOWN(addr);
463 if (node_start_pfn[nid] <= pfn &&
464 pfn < node_end_pfn[nid])
471 * This function is used to ask node id BEFORE memmap and mem_section's
472 * initialization (pfn_to_nid() can't be used yet).
473 * If _PXM is not defined on ACPI's DSDT, node id must be found by this.
475 int memory_add_physaddr_to_nid(u64 addr)
477 int nid = paddr_to_nid(addr);
478 return (nid >= 0) ? nid : 0;
481 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);