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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 Bhargava99a19cf12007-08-22 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();
George Beshersf1c0afa2007-02-05 16:20:04 -080048 printk(KERN_INFO "Node memory in pages:\n");
49 for_each_online_pgdat(pgdat) {
50 unsigned long present;
51 unsigned long flags;
52 int shared = 0, cached = 0, reserved = 0;
53
54 pgdat_resize_lock(pgdat, &flags);
55 present = pgdat->node_present_pages;
56 for(i = 0; i < pgdat->node_spanned_pages; i++) {
57 struct page *page;
Prarit Bhargava99a19cf12007-08-22 14:34:38 -040058 if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
59 touch_nmi_watchdog();
George Beshersf1c0afa2007-02-05 16:20:04 -080060 if (pfn_valid(pgdat->node_start_pfn + i))
61 page = pfn_to_page(pgdat->node_start_pfn + i);
62 else {
Bob Piccoe44e41d2006-06-28 12:55:43 -040063#ifdef CONFIG_VIRTUAL_MEM_MAP
George Beshersf1c0afa2007-02-05 16:20:04 -080064 if (max_gap < LARGE_GAP)
65 continue;
Bob Piccoe44e41d2006-06-28 12:55:43 -040066#endif
George Beshersf1c0afa2007-02-05 16:20:04 -080067 i = vmemmap_find_next_valid_pfn(pgdat->node_id,
68 i) - 1;
69 continue;
70 }
71 if (PageReserved(page))
72 reserved++;
73 else if (PageSwapCache(page))
74 cached++;
75 else if (page_count(page))
76 shared += page_count(page)-1;
Bob Piccoe44e41d2006-06-28 12:55:43 -040077 }
George Beshersf1c0afa2007-02-05 16:20:04 -080078 pgdat_resize_unlock(pgdat, &flags);
79 total_present += present;
80 total_reserved += reserved;
81 total_cached += cached;
82 total_shared += shared;
83 printk(KERN_INFO "Node %4d: RAM: %11ld, rsvd: %8d, "
84 "shrd: %10d, swpd: %10d\n", pgdat->node_id,
85 present, reserved, shared, cached);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 }
George Beshersf1c0afa2007-02-05 16:20:04 -080087 printk(KERN_INFO "%ld pages of RAM\n", total_present);
88 printk(KERN_INFO "%d reserved pages\n", total_reserved);
89 printk(KERN_INFO "%d pages shared\n", total_shared);
90 printk(KERN_INFO "%d pages swap cached\n", total_cached);
91 printk(KERN_INFO "Total of %ld pages in page table cache\n",
Christoph Lameter2bd62a42007-05-10 22:42:53 -070092 quicklist_total_size());
George Beshersf1c0afa2007-02-05 16:20:04 -080093 printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages());
Linus Torvalds1da177e2005-04-16 15:20:36 -070094}
95
George Beshersf1c0afa2007-02-05 16:20:04 -080096
Linus Torvalds1da177e2005-04-16 15:20:36 -070097/* physical address where the bootmem map is located */
98unsigned long bootmap_start;
99
100/**
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 * find_bootmap_location - callback to find a memory area for the bootmap
102 * @start: start of region
103 * @end: end of region
104 * @arg: unused callback data
105 *
106 * Find a place to put the bootmap and return its starting address in
107 * bootmap_start. This address must be page-aligned.
108 */
Chen, Kenneth Wdae28062006-03-22 16:54:15 -0800109static int __init
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110find_bootmap_location (unsigned long start, unsigned long end, void *arg)
111{
112 unsigned long needed = *(unsigned long *)arg;
113 unsigned long range_start, range_end, free_start;
114 int i;
115
116#if IGNORE_PFN0
117 if (start == PAGE_OFFSET) {
118 start += PAGE_SIZE;
119 if (start >= end)
120 return 0;
121 }
122#endif
123
124 free_start = PAGE_OFFSET;
125
126 for (i = 0; i < num_rsvd_regions; i++) {
127 range_start = max(start, free_start);
128 range_end = min(end, rsvd_region[i].start & PAGE_MASK);
129
130 free_start = PAGE_ALIGN(rsvd_region[i].end);
131
132 if (range_end <= range_start)
133 continue; /* skip over empty range */
134
135 if (range_end - range_start >= needed) {
136 bootmap_start = __pa(range_start);
137 return -1; /* done */
138 }
139
140 /* nothing more available in this segment */
141 if (range_end == end)
142 return 0;
143 }
144 return 0;
145}
146
Tony Luck4b9ddc72007-11-06 15:14:45 -0800147#ifdef CONFIG_SMP
148static void *cpu_data;
149/**
150 * per_cpu_init - setup per-cpu variables
151 *
152 * Allocate and setup per-cpu data areas.
153 */
154void * __cpuinit
155per_cpu_init (void)
156{
157 int cpu;
158 static int first_time=1;
159
160 /*
161 * get_free_pages() cannot be used before cpu_init() done. BSP
162 * allocates "NR_CPUS" pages for all CPUs to avoid that AP calls
163 * get_zeroed_page().
164 */
165 if (first_time) {
Tony Luck10617bb2008-08-12 10:34:20 -0700166 void *cpu0_data = __phys_per_cpu_start - PERCPU_PAGE_SIZE;
167
Tony Luck4b9ddc72007-11-06 15:14:45 -0800168 first_time=0;
Tony Luck10617bb2008-08-12 10:34:20 -0700169
170 __per_cpu_offset[0] = (char *) cpu0_data - __per_cpu_start;
171 per_cpu(local_per_cpu_offset, 0) = __per_cpu_offset[0];
172
173 for (cpu = 1; cpu < NR_CPUS; cpu++) {
Tony Luck4b9ddc72007-11-06 15:14:45 -0800174 memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start);
175 __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start;
176 cpu_data += PERCPU_PAGE_SIZE;
177 per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu];
178 }
179 }
180 return __per_cpu_start + __per_cpu_offset[smp_processor_id()];
181}
182
183static inline void
184alloc_per_cpu_data(void)
185{
Tony Luck10617bb2008-08-12 10:34:20 -0700186 cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS-1,
Tony Luck4b9ddc72007-11-06 15:14:45 -0800187 PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS));
188}
189#else
190#define alloc_per_cpu_data() do { } while (0)
191#endif /* CONFIG_SMP */
192
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193/**
194 * find_memory - setup memory map
195 *
196 * Walk the EFI memory map and find usable memory for the system, taking
197 * into account reserved areas.
198 */
Chen, Kenneth Wdae28062006-03-22 16:54:15 -0800199void __init
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200find_memory (void)
201{
202 unsigned long bootmap_size;
203
204 reserve_memory();
205
206 /* first find highest page frame number */
Zou Nan haia3f5c332007-03-20 13:41:57 -0700207 min_low_pfn = ~0UL;
208 max_low_pfn = 0;
209 efi_memmap_walk(find_max_min_low_pfn, NULL);
210 max_pfn = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 /* how many bytes to cover all the pages */
212 bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT;
213
214 /* look for a location to hold the bootmap */
215 bootmap_start = ~0UL;
216 efi_memmap_walk(find_bootmap_location, &bootmap_size);
217 if (bootmap_start == ~0UL)
218 panic("Cannot find %ld bytes for bootmap\n", bootmap_size);
219
Zou Nan haia3f5c332007-03-20 13:41:57 -0700220 bootmap_size = init_bootmem_node(NODE_DATA(0),
221 (bootmap_start >> PAGE_SHIFT), 0, max_pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
223 /* Free all available memory, then mark bootmem-map as being in use. */
224 efi_memmap_walk(filter_rsvd_memory, free_bootmem);
Bernhard Walle72a7fe32008-02-07 00:15:17 -0800225 reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227 find_initrd();
Horms45a98fc2006-12-12 17:49:03 +0900228
Tony Luck4b9ddc72007-11-06 15:14:45 -0800229 alloc_per_cpu_data();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230}
231
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232static int
233count_pages (u64 start, u64 end, void *arg)
234{
235 unsigned long *count = arg;
236
237 *count += (end - start) >> PAGE_SHIFT;
238 return 0;
239}
240
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241/*
242 * Set up the page tables.
243 */
244
Chen, Kenneth Wdae28062006-03-22 16:54:15 -0800245void __init
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246paging_init (void)
247{
248 unsigned long max_dma;
Mel Gorman05e0caa2006-09-27 01:49:54 -0700249 unsigned long max_zone_pfns[MAX_NR_ZONES];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251 num_physpages = 0;
252 efi_memmap_walk(count_pages, &num_physpages);
253
Mel Gorman6391af12006-10-11 01:20:39 -0700254 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
Christoph Lameter09ae1f52007-02-10 01:43:11 -0800255#ifdef CONFIG_ZONE_DMA
256 max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT;
Mel Gorman05e0caa2006-09-27 01:49:54 -0700257 max_zone_pfns[ZONE_DMA] = max_dma;
Christoph Lameter09ae1f52007-02-10 01:43:11 -0800258#endif
Mel Gorman05e0caa2006-09-27 01:49:54 -0700259 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
261#ifdef CONFIG_VIRTUAL_MEM_MAP
Zoltan Menyhart98075d22008-04-11 15:21:35 -0700262 efi_memmap_walk(filter_memory, register_active_ranges);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 efi_memmap_walk(find_largest_hole, (u64 *)&max_gap);
264 if (max_gap < LARGE_GAP) {
265 vmem_map = (struct page *) 0;
Mel Gorman05e0caa2006-09-27 01:49:54 -0700266 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 } else {
268 unsigned long map_size;
269
270 /* allocate virtual_mem_map */
271
Bob Picco921eea12006-06-28 12:54:55 -0400272 map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) *
273 sizeof(struct page));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 vmalloc_end -= map_size;
275 vmem_map = (struct page *) vmalloc_end;
276 efi_memmap_walk(create_mem_map_page_table, NULL);
277
Mel Gorman05e0caa2006-09-27 01:49:54 -0700278 /*
279 * alloc_node_mem_map makes an adjustment for mem_map
280 * which isn't compatible with vmem_map.
281 */
282 NODE_DATA(0)->node_mem_map = vmem_map +
283 find_min_pfn_with_active_regions();
284 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
286 printk("Virtual mem_map starts at 0x%p\n", mem_map);
287 }
288#else /* !CONFIG_VIRTUAL_MEM_MAP */
Mel Gorman05e0caa2006-09-27 01:49:54 -0700289 add_active_range(0, 0, max_low_pfn);
290 free_area_init_nodes(max_zone_pfns);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291#endif /* !CONFIG_VIRTUAL_MEM_MAP */
292 zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page));
293}