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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
4 * for more details.
5 *
6 * Copyright (C) 1998-2003 Hewlett-Packard Co
7 * David Mosberger-Tang <davidm@hpl.hp.com>
8 * Stephane Eranian <eranian@hpl.hp.com>
9 * Copyright (C) 2000, Rohit Seth <rohit.seth@intel.com>
10 * Copyright (C) 1999 VA Linux Systems
11 * Copyright (C) 1999 Walt Drummond <drummond@valinux.com>
12 * Copyright (C) 2003 Silicon Graphics, Inc. All rights reserved.
13 *
14 * Routines used by ia64 machines with contiguous (or virtually contiguous)
15 * memory.
16 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/bootmem.h>
18#include <linux/efi.h>
19#include <linux/mm.h>
Prarit Bhargava99a19cf2007-08-22 14:34:38 -040020#include <linux/nmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include <linux/swap.h>
22
23#include <asm/meminit.h>
24#include <asm/pgalloc.h>
25#include <asm/pgtable.h>
26#include <asm/sections.h>
27#include <asm/mca.h>
28
29#ifdef CONFIG_VIRTUAL_MEM_MAP
Bob Piccoe44e41d2006-06-28 12:55:43 -040030static unsigned long max_gap;
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#endif
32
33/**
George Beshersf1c0afa2007-02-05 16:20:04 -080034 * show_mem - give short summary of memory stats
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 *
George Beshersf1c0afa2007-02-05 16:20:04 -080036 * Shows a simple page count of reserved and used pages in the system.
37 * For discontig machines, it does this on a per-pgdat basis.
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 */
George Beshersf1c0afa2007-02-05 16:20:04 -080039void show_mem(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070040{
George Beshersf1c0afa2007-02-05 16:20:04 -080041 int i, total_reserved = 0;
42 int total_shared = 0, total_cached = 0;
43 unsigned long total_present = 0;
44 pg_data_t *pgdat;
Linus Torvalds1da177e2005-04-16 15:20:36 -070045
Jes Sorensen709a6c12006-09-13 08:43:42 -040046 printk(KERN_INFO "Mem-info:\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 show_free_areas();
Jes Sorensen709a6c12006-09-13 08:43:42 -040048 printk(KERN_INFO "Free swap: %6ldkB\n",
49 nr_swap_pages<<(PAGE_SHIFT-10));
George Beshersf1c0afa2007-02-05 16:20:04 -080050 printk(KERN_INFO "Node memory in pages:\n");
51 for_each_online_pgdat(pgdat) {
52 unsigned long present;
53 unsigned long flags;
54 int shared = 0, cached = 0, reserved = 0;
55
56 pgdat_resize_lock(pgdat, &flags);
57 present = pgdat->node_present_pages;
58 for(i = 0; i < pgdat->node_spanned_pages; i++) {
59 struct page *page;
Prarit Bhargava99a19cf2007-08-22 14:34:38 -040060 if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
61 touch_nmi_watchdog();
George Beshersf1c0afa2007-02-05 16:20:04 -080062 if (pfn_valid(pgdat->node_start_pfn + i))
63 page = pfn_to_page(pgdat->node_start_pfn + i);
64 else {
Bob Piccoe44e41d2006-06-28 12:55:43 -040065#ifdef CONFIG_VIRTUAL_MEM_MAP
George Beshersf1c0afa2007-02-05 16:20:04 -080066 if (max_gap < LARGE_GAP)
67 continue;
Bob Piccoe44e41d2006-06-28 12:55:43 -040068#endif
George Beshersf1c0afa2007-02-05 16:20:04 -080069 i = vmemmap_find_next_valid_pfn(pgdat->node_id,
70 i) - 1;
71 continue;
72 }
73 if (PageReserved(page))
74 reserved++;
75 else if (PageSwapCache(page))
76 cached++;
77 else if (page_count(page))
78 shared += page_count(page)-1;
Bob Piccoe44e41d2006-06-28 12:55:43 -040079 }
George Beshersf1c0afa2007-02-05 16:20:04 -080080 pgdat_resize_unlock(pgdat, &flags);
81 total_present += present;
82 total_reserved += reserved;
83 total_cached += cached;
84 total_shared += shared;
85 printk(KERN_INFO "Node %4d: RAM: %11ld, rsvd: %8d, "
86 "shrd: %10d, swpd: %10d\n", pgdat->node_id,
87 present, reserved, shared, cached);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 }
George Beshersf1c0afa2007-02-05 16:20:04 -080089 printk(KERN_INFO "%ld pages of RAM\n", total_present);
90 printk(KERN_INFO "%d reserved pages\n", total_reserved);
91 printk(KERN_INFO "%d pages shared\n", total_shared);
92 printk(KERN_INFO "%d pages swap cached\n", total_cached);
93 printk(KERN_INFO "Total of %ld pages in page table cache\n",
Christoph Lameter2bd62a42007-05-10 22:42:53 -070094 quicklist_total_size());
George Beshersf1c0afa2007-02-05 16:20:04 -080095 printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages());
Linus Torvalds1da177e2005-04-16 15:20:36 -070096}
97
George Beshersf1c0afa2007-02-05 16:20:04 -080098
Linus Torvalds1da177e2005-04-16 15:20:36 -070099/* physical address where the bootmem map is located */
100unsigned long bootmap_start;
101
102/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 * find_bootmap_location - callback to find a memory area for the bootmap
104 * @start: start of region
105 * @end: end of region
106 * @arg: unused callback data
107 *
108 * Find a place to put the bootmap and return its starting address in
109 * bootmap_start. This address must be page-aligned.
110 */
Chen, Kenneth Wdae280662006-03-22 16:54:15 -0800111static int __init
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112find_bootmap_location (unsigned long start, unsigned long end, void *arg)
113{
114 unsigned long needed = *(unsigned long *)arg;
115 unsigned long range_start, range_end, free_start;
116 int i;
117
118#if IGNORE_PFN0
119 if (start == PAGE_OFFSET) {
120 start += PAGE_SIZE;
121 if (start >= end)
122 return 0;
123 }
124#endif
125
126 free_start = PAGE_OFFSET;
127
128 for (i = 0; i < num_rsvd_regions; i++) {
129 range_start = max(start, free_start);
130 range_end = min(end, rsvd_region[i].start & PAGE_MASK);
131
132 free_start = PAGE_ALIGN(rsvd_region[i].end);
133
134 if (range_end <= range_start)
135 continue; /* skip over empty range */
136
137 if (range_end - range_start >= needed) {
138 bootmap_start = __pa(range_start);
139 return -1; /* done */
140 }
141
142 /* nothing more available in this segment */
143 if (range_end == end)
144 return 0;
145 }
146 return 0;
147}
148
Tony Luck4b9ddc72007-11-06 15:14:45 -0800149#ifdef CONFIG_SMP
150static void *cpu_data;
151/**
152 * per_cpu_init - setup per-cpu variables
153 *
154 * Allocate and setup per-cpu data areas.
155 */
156void * __cpuinit
157per_cpu_init (void)
158{
159 int cpu;
160 static int first_time=1;
161
162 /*
163 * get_free_pages() cannot be used before cpu_init() done. BSP
164 * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
165 * get_zeroed_page().
166 */
167 if (first_time) {
168 first_time=0;
169 for (cpu = 0; cpu < NR_CPUS; cpu++) {
170 memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
171 __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
172 cpu_data += PERCPU_PAGE_SIZE;
173 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
174 }
175 }
176 return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
177}
178
179static inline void
180alloc_per_cpu_data(void)
181{
182 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS,
183 PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
184}
185#else
186#define alloc_per_cpu_data() do { } while (0)
187#endif /* CONFIG_SMP */
188
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189/**
190 * find_memory - setup memory map
191 *
192 * Walk the EFI memory map and find usable memory for the system, taking
193 * into account reserved areas.
194 */
Chen, Kenneth Wdae280662006-03-22 16:54:15 -0800195void __init
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196find_memory (void)
197{
198 unsigned long bootmap_size;
199
200 reserve_memory();
201
202 /* first find highest page frame number */
Zou Nan haia3f5c332007-03-20 13:41:57 -0700203 min_low_pfn = ~0UL;
204 max_low_pfn = 0;
205 efi_memmap_walk(find_max_min_low_pfn, NULL);
206 max_pfn = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 /* how many bytes to cover all the pages */
208 bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
209
210 /* look for a location to hold the bootmap */
211 bootmap_start = ~0UL;
212 efi_memmap_walk(find_bootmap_location, &bootmap_size);
213 if (bootmap_start == ~0UL)
214 panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
215
Zou Nan haia3f5c332007-03-20 13:41:57 -0700216 bootmap_size = init_bootmem_node(NODE_DATA(0),
217 (bootmap_start >> PAGE_SHIFT), 0, max_pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
219 /* Free all available memory, then mark bootmem-map as being in use. */
220 efi_memmap_walk(filter_rsvd_memory, free_bootmem);
221 reserve_bootmem(bootmap_start, bootmap_size);
222
223 find_initrd();
Horms45a98fc2006-12-12 17:49:03 +0900224
Tony Luck4b9ddc72007-11-06 15:14:45 -0800225 alloc_per_cpu_data();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226}
227
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228static int
229count_pages (u64 start, u64 end, void *arg)
230{
231 unsigned long *count = arg;
232
233 *count += (end - start) >> PAGE_SHIFT;
234 return 0;
235}
236
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237/*
238 * Set up the page tables.
239 */
240
Chen, Kenneth Wdae280662006-03-22 16:54:15 -0800241void __init
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242paging_init (void)
243{
244 unsigned long max_dma;
Mel Gorman05e0caa2006-09-27 01:49:54 -0700245 unsigned long max_zone_pfns[MAX_NR_ZONES];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246
247 num_physpages = 0;
248 efi_memmap_walk(count_pages, &num_physpages);
249
Mel Gorman6391af12006-10-11 01:20:39 -0700250 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
Christoph Lameter09ae1f52007-02-10 01:43:11 -0800251#ifdef CONFIG_ZONE_DMA
252 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
Mel Gorman05e0caa2006-09-27 01:49:54 -0700253 max_zone_pfns[ZONE_DMA] = max_dma;
Christoph Lameter09ae1f52007-02-10 01:43:11 -0800254#endif
Mel Gorman05e0caa2006-09-27 01:49:54 -0700255 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257#ifdef CONFIG_VIRTUAL_MEM_MAP
Tony Luck8b9c1062006-12-12 11:18:55 -0800258 efi_memmap_walk(register_active_ranges, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
260 if (max_gap < LARGE_GAP) {
261 vmem_map = (struct page *) 0;
Mel Gorman05e0caa2006-09-27 01:49:54 -0700262 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 } else {
264 unsigned long map_size;
265
266 /* allocate virtual_mem_map */
267
Bob Picco921eea12006-06-28 12:54:55 -0400268 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
269 sizeof(struct page));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 vmalloc_end -= map_size;
271 vmem_map = (struct page *) vmalloc_end;
272 efi_memmap_walk(create_mem_map_page_table, NULL);
273
Mel Gorman05e0caa2006-09-27 01:49:54 -0700274 /*
275 * alloc_node_mem_map makes an adjustment for mem_map
276 * which isn't compatible with vmem_map.
277 */
278 NODE_DATA(0)->node_mem_map = vmem_map +
279 find_min_pfn_with_active_regions();
280 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281
282 printk("Virtual mem_map starts at 0x%p\n", mem_map);
283 }
284#else /* !CONFIG_VIRTUAL_MEM_MAP */
Mel Gorman05e0caa2006-09-27 01:49:54 -0700285 add_active_range(0, 0, max_low_pfn);
286 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287#endif /* !CONFIG_VIRTUAL_MEM_MAP */
288 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
289}