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1da177e4 LT |
1 | /* |
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 | */ | |
1da177e4 LT |
17 | #include <linux/bootmem.h> |
18 | #include <linux/efi.h> | |
19 | #include <linux/mm.h> | |
99a19cf1 | 20 | #include <linux/nmi.h> |
1da177e4 LT |
21 | #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 | |
e44e41d0 | 30 | static unsigned long max_gap; |
1da177e4 LT |
31 | #endif |
32 | ||
33 | /** | |
f1c0afa2 | 34 | * show_mem - give short summary of memory stats |
1da177e4 | 35 | * |
f1c0afa2 GB |
36 | * 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. | |
1da177e4 | 38 | */ |
f1c0afa2 | 39 | void show_mem(void) |
1da177e4 | 40 | { |
f1c0afa2 GB |
41 | int i, total_reserved = 0; |
42 | int total_shared = 0, total_cached = 0; | |
43 | unsigned long total_present = 0; | |
44 | pg_data_t *pgdat; | |
1da177e4 | 45 | |
709a6c1c | 46 | printk(KERN_INFO "Mem-info:\n"); |
1da177e4 | 47 | show_free_areas(); |
f1c0afa2 GB |
48 | 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; | |
99a19cf1 PB |
58 | if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) |
59 | touch_nmi_watchdog(); | |
f1c0afa2 GB |
60 | if (pfn_valid(pgdat->node_start_pfn + i)) |
61 | page = pfn_to_page(pgdat->node_start_pfn + i); | |
62 | else { | |
e44e41d0 | 63 | #ifdef CONFIG_VIRTUAL_MEM_MAP |
f1c0afa2 GB |
64 | if (max_gap < LARGE_GAP) |
65 | continue; | |
e44e41d0 | 66 | #endif |
f1c0afa2 GB |
67 | 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; | |
e44e41d0 | 77 | } |
f1c0afa2 GB |
78 | 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); | |
1da177e4 | 86 | } |
f1c0afa2 GB |
87 | 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", | |
2bd62a40 | 92 | quicklist_total_size()); |
f1c0afa2 | 93 | printk(KERN_INFO "%d free buffer pages\n", nr_free_buffer_pages()); |
1da177e4 LT |
94 | } |
95 | ||
f1c0afa2 | 96 | |
1da177e4 LT |
97 | /* physical address where the bootmem map is located */ |
98 | unsigned long bootmap_start; | |
99 | ||
1da177e4 LT |
100 | /** |
101 | * 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 | */ | |
dae28066 | 109 | static int __init |
1da177e4 LT |
110 | find_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 | ||
4b9ddc7c TL |
147 | #ifdef CONFIG_SMP |
148 | static void *cpu_data; | |
149 | /** | |
150 | * per_cpu_init - setup per-cpu variables | |
151 | * | |
152 | * Allocate and setup per-cpu data areas. | |
153 | */ | |
154 | void * __cpuinit | |
155 | per_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) { | |
166 | first_time=0; | |
167 | for (cpu = 0; cpu < NR_CPUS; cpu++) { | |
168 | memcpy(cpu_data, __phys_per_cpu_start, __per_cpu_end - __per_cpu_start); | |
169 | __per_cpu_offset[cpu] = (char *) cpu_data - __per_cpu_start; | |
170 | cpu_data += PERCPU_PAGE_SIZE; | |
171 | per_cpu(local_per_cpu_offset, cpu) = __per_cpu_offset[cpu]; | |
172 | } | |
173 | } | |
174 | return __per_cpu_start + __per_cpu_offset[smp_processor_id()]; | |
175 | } | |
176 | ||
177 | static inline void | |
178 | alloc_per_cpu_data(void) | |
179 | { | |
180 | cpu_data = __alloc_bootmem(PERCPU_PAGE_SIZE * NR_CPUS, | |
181 | PERCPU_PAGE_SIZE, __pa(MAX_DMA_ADDRESS)); | |
182 | } | |
183 | #else | |
184 | #define alloc_per_cpu_data() do { } while (0) | |
185 | #endif /* CONFIG_SMP */ | |
186 | ||
1da177e4 LT |
187 | /** |
188 | * find_memory - setup memory map | |
189 | * | |
190 | * Walk the EFI memory map and find usable memory for the system, taking | |
191 | * into account reserved areas. | |
192 | */ | |
dae28066 | 193 | void __init |
1da177e4 LT |
194 | find_memory (void) |
195 | { | |
196 | unsigned long bootmap_size; | |
197 | ||
198 | reserve_memory(); | |
199 | ||
200 | /* first find highest page frame number */ | |
a3f5c338 ZN |
201 | min_low_pfn = ~0UL; |
202 | max_low_pfn = 0; | |
203 | efi_memmap_walk(find_max_min_low_pfn, NULL); | |
204 | max_pfn = max_low_pfn; | |
1da177e4 LT |
205 | /* how many bytes to cover all the pages */ |
206 | bootmap_size = bootmem_bootmap_pages(max_pfn) << PAGE_SHIFT; | |
207 | ||
208 | /* look for a location to hold the bootmap */ | |
209 | bootmap_start = ~0UL; | |
210 | efi_memmap_walk(find_bootmap_location, &bootmap_size); | |
211 | if (bootmap_start == ~0UL) | |
212 | panic("Cannot find %ld bytes for bootmap\n", bootmap_size); | |
213 | ||
a3f5c338 ZN |
214 | bootmap_size = init_bootmem_node(NODE_DATA(0), |
215 | (bootmap_start >> PAGE_SHIFT), 0, max_pfn); | |
1da177e4 LT |
216 | |
217 | /* Free all available memory, then mark bootmem-map as being in use. */ | |
218 | efi_memmap_walk(filter_rsvd_memory, free_bootmem); | |
72a7fe39 | 219 | reserve_bootmem(bootmap_start, bootmap_size, BOOTMEM_DEFAULT); |
1da177e4 LT |
220 | |
221 | find_initrd(); | |
45a98fc6 | 222 | |
4b9ddc7c | 223 | alloc_per_cpu_data(); |
1da177e4 LT |
224 | } |
225 | ||
1da177e4 LT |
226 | static int |
227 | count_pages (u64 start, u64 end, void *arg) | |
228 | { | |
229 | unsigned long *count = arg; | |
230 | ||
231 | *count += (end - start) >> PAGE_SHIFT; | |
232 | return 0; | |
233 | } | |
234 | ||
1da177e4 LT |
235 | /* |
236 | * Set up the page tables. | |
237 | */ | |
238 | ||
dae28066 | 239 | void __init |
1da177e4 LT |
240 | paging_init (void) |
241 | { | |
242 | unsigned long max_dma; | |
05e0caad | 243 | unsigned long max_zone_pfns[MAX_NR_ZONES]; |
1da177e4 LT |
244 | |
245 | num_physpages = 0; | |
246 | efi_memmap_walk(count_pages, &num_physpages); | |
247 | ||
6391af17 | 248 | memset(max_zone_pfns, 0, sizeof(max_zone_pfns)); |
09ae1f58 CL |
249 | #ifdef CONFIG_ZONE_DMA |
250 | max_dma = virt_to_phys((void *) MAX_DMA_ADDRESS) >> PAGE_SHIFT; | |
05e0caad | 251 | max_zone_pfns[ZONE_DMA] = max_dma; |
09ae1f58 | 252 | #endif |
05e0caad | 253 | max_zone_pfns[ZONE_NORMAL] = max_low_pfn; |
1da177e4 LT |
254 | |
255 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
98075d24 | 256 | efi_memmap_walk(filter_memory, register_active_ranges); |
1da177e4 LT |
257 | efi_memmap_walk(find_largest_hole, (u64 *)&max_gap); |
258 | if (max_gap < LARGE_GAP) { | |
259 | vmem_map = (struct page *) 0; | |
05e0caad | 260 | free_area_init_nodes(max_zone_pfns); |
1da177e4 LT |
261 | } else { |
262 | unsigned long map_size; | |
263 | ||
264 | /* allocate virtual_mem_map */ | |
265 | ||
921eea1c BP |
266 | map_size = PAGE_ALIGN(ALIGN(max_low_pfn, MAX_ORDER_NR_PAGES) * |
267 | sizeof(struct page)); | |
1da177e4 LT |
268 | vmalloc_end -= map_size; |
269 | vmem_map = (struct page *) vmalloc_end; | |
270 | efi_memmap_walk(create_mem_map_page_table, NULL); | |
271 | ||
05e0caad MG |
272 | /* |
273 | * alloc_node_mem_map makes an adjustment for mem_map | |
274 | * which isn't compatible with vmem_map. | |
275 | */ | |
276 | NODE_DATA(0)->node_mem_map = vmem_map + | |
277 | find_min_pfn_with_active_regions(); | |
278 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 LT |
279 | |
280 | printk("Virtual mem_map starts at 0x%p\n", mem_map); | |
281 | } | |
282 | #else /* !CONFIG_VIRTUAL_MEM_MAP */ | |
05e0caad MG |
283 | add_active_range(0, 0, max_low_pfn); |
284 | free_area_init_nodes(max_zone_pfns); | |
1da177e4 LT |
285 | #endif /* !CONFIG_VIRTUAL_MEM_MAP */ |
286 | zero_page_memmap_ptr = virt_to_page(ia64_imva(empty_zero_page)); | |
287 | } |