Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Johannes Weiner | 57cfc29 | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 2 | * bootmem - A boot-time physical memory allocator and configurator |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 1999 Ingo Molnar |
Johannes Weiner | 57cfc29 | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 5 | * 1999 Kanoj Sarcar, SGI |
| 6 | * 2008 Johannes Weiner |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
Johannes Weiner | 57cfc29 | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 8 | * Access to this subsystem has to be serialized externally (which is true |
| 9 | * for the boot process anyway). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | #include <linux/init.h> |
Franck Bui-Huu | bbc7b92 | 2006-09-25 23:31:07 -0700 | [diff] [blame] | 12 | #include <linux/pfn.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/bootmem.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/module.h> |
Franck Bui-Huu | e786e86 | 2006-09-25 23:31:06 -0700 | [diff] [blame] | 15 | |
| 16 | #include <asm/bug.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <asm/io.h> |
Heiko Carstens | dfd54cb | 2006-09-25 23:31:33 -0700 | [diff] [blame] | 18 | #include <asm/processor.h> |
Franck Bui-Huu | e786e86 | 2006-09-25 23:31:06 -0700 | [diff] [blame] | 19 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include "internal.h" |
| 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | unsigned long max_low_pfn; |
| 23 | unsigned long min_low_pfn; |
| 24 | unsigned long max_pfn; |
| 25 | |
Vivek Goyal | 92aa63a | 2005-06-25 14:58:18 -0700 | [diff] [blame] | 26 | #ifdef CONFIG_CRASH_DUMP |
| 27 | /* |
| 28 | * If we have booted due to a crash, max_pfn will be a very low value. We need |
| 29 | * to know the amount of memory that the previous kernel used. |
| 30 | */ |
| 31 | unsigned long saved_max_pfn; |
| 32 | #endif |
| 33 | |
Johannes Weiner | b61bfa3 | 2008-07-23 21:26:55 -0700 | [diff] [blame] | 34 | bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata; |
| 35 | |
Johannes Weiner | 636cc40 | 2008-07-23 21:28:03 -0700 | [diff] [blame] | 36 | static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list); |
| 37 | |
Johannes Weiner | 2e5237d | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 38 | static int bootmem_debug; |
| 39 | |
| 40 | static int __init bootmem_debug_setup(char *buf) |
| 41 | { |
| 42 | bootmem_debug = 1; |
| 43 | return 0; |
| 44 | } |
| 45 | early_param("bootmem_debug", bootmem_debug_setup); |
| 46 | |
| 47 | #define bdebug(fmt, args...) ({ \ |
| 48 | if (unlikely(bootmem_debug)) \ |
| 49 | printk(KERN_INFO \ |
| 50 | "bootmem::%s " fmt, \ |
| 51 | __FUNCTION__, ## args); \ |
| 52 | }) |
| 53 | |
Johannes Weiner | df049a5 | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 54 | static unsigned long __init bootmap_bytes(unsigned long pages) |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 55 | { |
Johannes Weiner | df049a5 | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 56 | unsigned long bytes = (pages + 7) / 8; |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 57 | |
Johannes Weiner | df049a5 | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 58 | return ALIGN(bytes, sizeof(long)); |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 59 | } |
| 60 | |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 61 | /** |
| 62 | * bootmem_bootmap_pages - calculate bitmap size in pages |
| 63 | * @pages: number of pages the bitmap has to represent |
| 64 | */ |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 65 | unsigned long __init bootmem_bootmap_pages(unsigned long pages) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | { |
Johannes Weiner | df049a5 | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 67 | unsigned long bytes = bootmap_bytes(pages); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Johannes Weiner | df049a5 | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 69 | return PAGE_ALIGN(bytes) >> PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | } |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 71 | |
KAMEZAWA Hiroyuki | 679bc9f | 2006-03-27 01:15:58 -0800 | [diff] [blame] | 72 | /* |
| 73 | * link bdata in order |
| 74 | */ |
Franck Bui-Huu | 69d49e6 | 2006-09-25 23:31:04 -0700 | [diff] [blame] | 75 | static void __init link_bootmem(bootmem_data_t *bdata) |
KAMEZAWA Hiroyuki | 679bc9f | 2006-03-27 01:15:58 -0800 | [diff] [blame] | 76 | { |
Johannes Weiner | 636cc40 | 2008-07-23 21:28:03 -0700 | [diff] [blame] | 77 | struct list_head *iter; |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 78 | |
Johannes Weiner | 636cc40 | 2008-07-23 21:28:03 -0700 | [diff] [blame] | 79 | list_for_each(iter, &bdata_list) { |
| 80 | bootmem_data_t *ent; |
| 81 | |
| 82 | ent = list_entry(iter, bootmem_data_t, list); |
| 83 | if (bdata->node_boot_start < ent->node_boot_start) |
| 84 | break; |
KAMEZAWA Hiroyuki | 679bc9f | 2006-03-27 01:15:58 -0800 | [diff] [blame] | 85 | } |
Johannes Weiner | 636cc40 | 2008-07-23 21:28:03 -0700 | [diff] [blame] | 86 | list_add_tail(&bdata->list, iter); |
KAMEZAWA Hiroyuki | 679bc9f | 2006-03-27 01:15:58 -0800 | [diff] [blame] | 87 | } |
| 88 | |
Franck Bui-Huu | bbc7b92 | 2006-09-25 23:31:07 -0700 | [diff] [blame] | 89 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | * Called once to set up the allocator itself. |
| 91 | */ |
Johannes Weiner | 8ae0446 | 2008-07-23 21:26:59 -0700 | [diff] [blame] | 92 | static unsigned long __init init_bootmem_core(bootmem_data_t *bdata, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | unsigned long mapstart, unsigned long start, unsigned long end) |
| 94 | { |
Franck Bui-Huu | bbc7b92 | 2006-09-25 23:31:07 -0700 | [diff] [blame] | 95 | unsigned long mapsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
Mel Gorman | 2dbb51c | 2008-07-23 21:26:52 -0700 | [diff] [blame] | 97 | mminit_validate_memmodel_limits(&start, &end); |
Franck Bui-Huu | bbc7b92 | 2006-09-25 23:31:07 -0700 | [diff] [blame] | 98 | bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart)); |
| 99 | bdata->node_boot_start = PFN_PHYS(start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | bdata->node_low_pfn = end; |
KAMEZAWA Hiroyuki | 679bc9f | 2006-03-27 01:15:58 -0800 | [diff] [blame] | 101 | link_bootmem(bdata); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
| 103 | /* |
| 104 | * Initially all pages are reserved - setup_arch() has to |
| 105 | * register free RAM areas explicitly. |
| 106 | */ |
Johannes Weiner | df049a5 | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 107 | mapsize = bootmap_bytes(end - start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | memset(bdata->node_bootmem_map, 0xff, mapsize); |
| 109 | |
Johannes Weiner | 2e5237d | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 110 | bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n", |
| 111 | bdata - bootmem_node_data, start, mapstart, end, mapsize); |
| 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | return mapsize; |
| 114 | } |
| 115 | |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 116 | /** |
| 117 | * init_bootmem_node - register a node as boot memory |
| 118 | * @pgdat: node to register |
| 119 | * @freepfn: pfn where the bitmap for this node is to be placed |
| 120 | * @startpfn: first pfn on the node |
| 121 | * @endpfn: first pfn after the node |
| 122 | * |
| 123 | * Returns the number of bytes needed to hold the bitmap for this node. |
| 124 | */ |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 125 | unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn, |
| 126 | unsigned long startpfn, unsigned long endpfn) |
| 127 | { |
| 128 | return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn); |
| 129 | } |
| 130 | |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 131 | /** |
| 132 | * init_bootmem - register boot memory |
| 133 | * @start: pfn where the bitmap is to be placed |
| 134 | * @pages: number of available physical pages |
| 135 | * |
| 136 | * Returns the number of bytes needed to hold the bitmap. |
| 137 | */ |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 138 | unsigned long __init init_bootmem(unsigned long start, unsigned long pages) |
| 139 | { |
| 140 | max_low_pfn = pages; |
| 141 | min_low_pfn = start; |
| 142 | return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages); |
| 143 | } |
| 144 | |
| 145 | static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata) |
| 146 | { |
Johannes Weiner | 41546c1 | 2008-07-23 21:28:03 -0700 | [diff] [blame^] | 147 | int aligned; |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 148 | struct page *page; |
Johannes Weiner | 41546c1 | 2008-07-23 21:28:03 -0700 | [diff] [blame^] | 149 | unsigned long start, end, pages, count = 0; |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 150 | |
Johannes Weiner | 41546c1 | 2008-07-23 21:28:03 -0700 | [diff] [blame^] | 151 | if (!bdata->node_bootmem_map) |
| 152 | return 0; |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 153 | |
Johannes Weiner | 41546c1 | 2008-07-23 21:28:03 -0700 | [diff] [blame^] | 154 | start = PFN_DOWN(bdata->node_boot_start); |
| 155 | end = bdata->node_low_pfn; |
| 156 | |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 157 | /* |
Johannes Weiner | 41546c1 | 2008-07-23 21:28:03 -0700 | [diff] [blame^] | 158 | * If the start is aligned to the machines wordsize, we might |
| 159 | * be able to free pages in bulks of that order. |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 160 | */ |
Johannes Weiner | 41546c1 | 2008-07-23 21:28:03 -0700 | [diff] [blame^] | 161 | aligned = !(start & (BITS_PER_LONG - 1)); |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 162 | |
Johannes Weiner | 41546c1 | 2008-07-23 21:28:03 -0700 | [diff] [blame^] | 163 | bdebug("nid=%td start=%lx end=%lx aligned=%d\n", |
| 164 | bdata - bootmem_node_data, start, end, aligned); |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 165 | |
Johannes Weiner | 41546c1 | 2008-07-23 21:28:03 -0700 | [diff] [blame^] | 166 | while (start < end) { |
| 167 | unsigned long *map, idx, vec; |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 168 | |
Johannes Weiner | 41546c1 | 2008-07-23 21:28:03 -0700 | [diff] [blame^] | 169 | map = bdata->node_bootmem_map; |
| 170 | idx = start - PFN_DOWN(bdata->node_boot_start); |
| 171 | vec = ~map[idx / BITS_PER_LONG]; |
| 172 | |
| 173 | if (aligned && vec == ~0UL && start + BITS_PER_LONG < end) { |
| 174 | int order = ilog2(BITS_PER_LONG); |
| 175 | |
| 176 | __free_pages_bootmem(pfn_to_page(start), order); |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 177 | count += BITS_PER_LONG; |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 178 | } else { |
Johannes Weiner | 41546c1 | 2008-07-23 21:28:03 -0700 | [diff] [blame^] | 179 | unsigned long off = 0; |
| 180 | |
| 181 | while (vec && off < BITS_PER_LONG) { |
| 182 | if (vec & 1) { |
| 183 | page = pfn_to_page(start + off); |
| 184 | __free_pages_bootmem(page, 0); |
| 185 | count++; |
| 186 | } |
| 187 | vec >>= 1; |
| 188 | off++; |
| 189 | } |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 190 | } |
Johannes Weiner | 41546c1 | 2008-07-23 21:28:03 -0700 | [diff] [blame^] | 191 | start += BITS_PER_LONG; |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 192 | } |
| 193 | |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 194 | page = virt_to_page(bdata->node_bootmem_map); |
Johannes Weiner | df049a5 | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 195 | pages = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start); |
Johannes Weiner | 41546c1 | 2008-07-23 21:28:03 -0700 | [diff] [blame^] | 196 | pages = bootmem_bootmap_pages(pages); |
| 197 | count += pages; |
| 198 | while (pages--) |
| 199 | __free_pages_bootmem(page++, 0); |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 200 | |
Johannes Weiner | 2e5237d | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 201 | bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count); |
| 202 | |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 203 | return count; |
| 204 | } |
| 205 | |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 206 | /** |
| 207 | * free_all_bootmem_node - release a node's free pages to the buddy allocator |
| 208 | * @pgdat: node to be released |
| 209 | * |
| 210 | * Returns the number of pages actually released. |
| 211 | */ |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 212 | unsigned long __init free_all_bootmem_node(pg_data_t *pgdat) |
| 213 | { |
| 214 | register_page_bootmem_info_node(pgdat); |
| 215 | return free_all_bootmem_core(pgdat->bdata); |
| 216 | } |
| 217 | |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 218 | /** |
| 219 | * free_all_bootmem - release free pages to the buddy allocator |
| 220 | * |
| 221 | * Returns the number of pages actually released. |
| 222 | */ |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 223 | unsigned long __init free_all_bootmem(void) |
| 224 | { |
| 225 | return free_all_bootmem_core(NODE_DATA(0)->bdata); |
| 226 | } |
| 227 | |
| 228 | static void __init free_bootmem_core(bootmem_data_t *bdata, unsigned long addr, |
| 229 | unsigned long size) |
| 230 | { |
| 231 | unsigned long sidx, eidx; |
| 232 | unsigned long i; |
| 233 | |
| 234 | BUG_ON(!size); |
| 235 | |
| 236 | /* out range */ |
| 237 | if (addr + size < bdata->node_boot_start || |
| 238 | PFN_DOWN(addr) > bdata->node_low_pfn) |
| 239 | return; |
| 240 | /* |
| 241 | * round down end of usable mem, partially free pages are |
| 242 | * considered reserved. |
| 243 | */ |
| 244 | |
| 245 | if (addr >= bdata->node_boot_start && addr < bdata->last_success) |
| 246 | bdata->last_success = addr; |
| 247 | |
| 248 | /* |
| 249 | * Round up to index to the range. |
| 250 | */ |
| 251 | if (PFN_UP(addr) > PFN_DOWN(bdata->node_boot_start)) |
| 252 | sidx = PFN_UP(addr) - PFN_DOWN(bdata->node_boot_start); |
| 253 | else |
| 254 | sidx = 0; |
| 255 | |
| 256 | eidx = PFN_DOWN(addr + size - bdata->node_boot_start); |
| 257 | if (eidx > bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start)) |
| 258 | eidx = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start); |
| 259 | |
Johannes Weiner | 2e5237d | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 260 | bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data, |
| 261 | sidx + PFN_DOWN(bdata->node_boot_start), |
| 262 | eidx + PFN_DOWN(bdata->node_boot_start)); |
| 263 | |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 264 | for (i = sidx; i < eidx; i++) { |
| 265 | if (unlikely(!test_and_clear_bit(i, bdata->node_bootmem_map))) |
| 266 | BUG(); |
| 267 | } |
| 268 | } |
| 269 | |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 270 | /** |
| 271 | * free_bootmem_node - mark a page range as usable |
| 272 | * @pgdat: node the range resides on |
| 273 | * @physaddr: starting address of the range |
| 274 | * @size: size of the range in bytes |
| 275 | * |
| 276 | * Partial pages will be considered reserved and left as they are. |
| 277 | * |
| 278 | * Only physical pages that actually reside on @pgdat are marked. |
| 279 | */ |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 280 | void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, |
| 281 | unsigned long size) |
| 282 | { |
| 283 | free_bootmem_core(pgdat->bdata, physaddr, size); |
| 284 | } |
| 285 | |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 286 | /** |
| 287 | * free_bootmem - mark a page range as usable |
| 288 | * @addr: starting address of the range |
| 289 | * @size: size of the range in bytes |
| 290 | * |
| 291 | * Partial pages will be considered reserved and left as they are. |
| 292 | * |
| 293 | * All physical pages within the range are marked, no matter what |
| 294 | * node they reside on. |
| 295 | */ |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 296 | void __init free_bootmem(unsigned long addr, unsigned long size) |
| 297 | { |
| 298 | bootmem_data_t *bdata; |
| 299 | list_for_each_entry(bdata, &bdata_list, list) |
| 300 | free_bootmem_core(bdata, addr, size); |
| 301 | } |
| 302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | /* |
| 304 | * Marks a particular physical memory range as unallocatable. Usable RAM |
| 305 | * might be used for boot-time allocations - or it might get added |
| 306 | * to the free page pool later on. |
| 307 | */ |
Yinghai Lu | a5645a6 | 2008-03-18 12:49:12 -0700 | [diff] [blame] | 308 | static int __init can_reserve_bootmem_core(bootmem_data_t *bdata, |
Bernhard Walle | 72a7fe3 | 2008-02-07 00:15:17 -0800 | [diff] [blame] | 309 | unsigned long addr, unsigned long size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | { |
Franck Bui-Huu | bbc7b92 | 2006-09-25 23:31:07 -0700 | [diff] [blame] | 311 | unsigned long sidx, eidx; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | unsigned long i; |
Yinghai Lu | a5645a6 | 2008-03-18 12:49:12 -0700 | [diff] [blame] | 313 | |
| 314 | BUG_ON(!size); |
| 315 | |
| 316 | /* out of range, don't hold other */ |
| 317 | if (addr + size < bdata->node_boot_start || |
| 318 | PFN_DOWN(addr) > bdata->node_low_pfn) |
| 319 | return 0; |
Franck Bui-Huu | bbc7b92 | 2006-09-25 23:31:07 -0700 | [diff] [blame] | 320 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | /* |
Yinghai Lu | a5645a6 | 2008-03-18 12:49:12 -0700 | [diff] [blame] | 322 | * Round up to index to the range. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | */ |
Yinghai Lu | a5645a6 | 2008-03-18 12:49:12 -0700 | [diff] [blame] | 324 | if (addr > bdata->node_boot_start) |
| 325 | sidx= PFN_DOWN(addr - bdata->node_boot_start); |
| 326 | else |
| 327 | sidx = 0; |
Franck Bui-Huu | bbc7b92 | 2006-09-25 23:31:07 -0700 | [diff] [blame] | 328 | |
Franck Bui-Huu | bbc7b92 | 2006-09-25 23:31:07 -0700 | [diff] [blame] | 329 | eidx = PFN_UP(addr + size - bdata->node_boot_start); |
Yinghai Lu | a5645a6 | 2008-03-18 12:49:12 -0700 | [diff] [blame] | 330 | if (eidx > bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start)) |
| 331 | eidx = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | |
Yinghai Lu | a5645a6 | 2008-03-18 12:49:12 -0700 | [diff] [blame] | 333 | for (i = sidx; i < eidx; i++) { |
| 334 | if (test_bit(i, bdata->node_bootmem_map)) { |
| 335 | if (flags & BOOTMEM_EXCLUSIVE) |
| 336 | return -EBUSY; |
| 337 | } |
| 338 | } |
| 339 | |
| 340 | return 0; |
| 341 | |
| 342 | } |
| 343 | |
| 344 | static void __init reserve_bootmem_core(bootmem_data_t *bdata, |
| 345 | unsigned long addr, unsigned long size, int flags) |
| 346 | { |
| 347 | unsigned long sidx, eidx; |
| 348 | unsigned long i; |
| 349 | |
| 350 | BUG_ON(!size); |
| 351 | |
| 352 | /* out of range */ |
| 353 | if (addr + size < bdata->node_boot_start || |
| 354 | PFN_DOWN(addr) > bdata->node_low_pfn) |
| 355 | return; |
| 356 | |
| 357 | /* |
| 358 | * Round up to index to the range. |
| 359 | */ |
| 360 | if (addr > bdata->node_boot_start) |
| 361 | sidx= PFN_DOWN(addr - bdata->node_boot_start); |
| 362 | else |
| 363 | sidx = 0; |
| 364 | |
| 365 | eidx = PFN_UP(addr + size - bdata->node_boot_start); |
| 366 | if (eidx > bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start)) |
| 367 | eidx = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start); |
| 368 | |
Johannes Weiner | 2e5237d | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 369 | bdebug("nid=%td start=%lx end=%lx flags=%x\n", |
| 370 | bdata - bootmem_node_data, |
| 371 | sidx + PFN_DOWN(bdata->node_boot_start), |
| 372 | eidx + PFN_DOWN(bdata->node_boot_start), |
| 373 | flags); |
| 374 | |
| 375 | for (i = sidx; i < eidx; i++) |
| 376 | if (test_and_set_bit(i, bdata->node_bootmem_map)) |
| 377 | bdebug("hm, page %lx reserved twice.\n", |
| 378 | PFN_DOWN(bdata->node_boot_start) + i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | } |
| 380 | |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 381 | /** |
| 382 | * reserve_bootmem_node - mark a page range as reserved |
| 383 | * @pgdat: node the range resides on |
| 384 | * @physaddr: starting address of the range |
| 385 | * @size: size of the range in bytes |
| 386 | * @flags: reservation flags (see linux/bootmem.h) |
| 387 | * |
| 388 | * Partial pages will be reserved. |
| 389 | * |
| 390 | * Only physical pages that actually reside on @pgdat are marked. |
| 391 | */ |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 392 | int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr, |
| 393 | unsigned long size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | { |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 395 | int ret; |
Franck Bui-Huu | bbc7b92 | 2006-09-25 23:31:07 -0700 | [diff] [blame] | 396 | |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 397 | ret = can_reserve_bootmem_core(pgdat->bdata, physaddr, size, flags); |
| 398 | if (ret < 0) |
| 399 | return -ENOMEM; |
| 400 | reserve_bootmem_core(pgdat->bdata, physaddr, size, flags); |
| 401 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | } |
| 403 | |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 404 | #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 405 | /** |
| 406 | * reserve_bootmem - mark a page range as usable |
| 407 | * @addr: starting address of the range |
| 408 | * @size: size of the range in bytes |
| 409 | * @flags: reservation flags (see linux/bootmem.h) |
| 410 | * |
| 411 | * Partial pages will be reserved. |
| 412 | * |
| 413 | * All physical pages within the range are marked, no matter what |
| 414 | * node they reside on. |
| 415 | */ |
Johannes Weiner | 223e8dc | 2008-07-23 21:28:00 -0700 | [diff] [blame] | 416 | int __init reserve_bootmem(unsigned long addr, unsigned long size, |
| 417 | int flags) |
| 418 | { |
| 419 | bootmem_data_t *bdata; |
| 420 | int ret; |
| 421 | |
| 422 | list_for_each_entry(bdata, &bdata_list, list) { |
| 423 | ret = can_reserve_bootmem_core(bdata, addr, size, flags); |
| 424 | if (ret < 0) |
| 425 | return ret; |
| 426 | } |
| 427 | list_for_each_entry(bdata, &bdata_list, list) |
| 428 | reserve_bootmem_core(bdata, addr, size, flags); |
| 429 | |
| 430 | return 0; |
| 431 | } |
| 432 | #endif /* !CONFIG_HAVE_ARCH_BOOTMEM_NODE */ |
| 433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | /* |
| 435 | * We 'merge' subsequent allocations to save space. We might 'lose' |
| 436 | * some fraction of a page if allocations cannot be satisfied due to |
| 437 | * size constraints on boxes where there is physical RAM space |
| 438 | * fragmentation - in these cases (mostly large memory boxes) this |
| 439 | * is not a problem. |
| 440 | * |
| 441 | * On low memory boxes we get it right in 100% of the cases. |
| 442 | * |
| 443 | * alignment has to be a power of 2 value. |
| 444 | * |
| 445 | * NOTE: This function is _not_ reentrant. |
| 446 | */ |
Johannes Weiner | ffc6421 | 2008-07-23 21:26:59 -0700 | [diff] [blame] | 447 | static void * __init |
| 448 | alloc_bootmem_core(struct bootmem_data *bdata, unsigned long size, |
| 449 | unsigned long align, unsigned long goal, unsigned long limit) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | { |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 451 | unsigned long areasize, preferred; |
Franck Bui-Huu | bbc7b92 | 2006-09-25 23:31:07 -0700 | [diff] [blame] | 452 | unsigned long i, start = 0, incr, eidx, end_pfn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | void *ret; |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 454 | unsigned long node_boot_start; |
| 455 | void *node_bootmem_map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 457 | if (!size) { |
Johannes Weiner | ffc6421 | 2008-07-23 21:26:59 -0700 | [diff] [blame] | 458 | printk("alloc_bootmem_core(): zero-sized request\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | BUG(); |
| 460 | } |
| 461 | BUG_ON(align & (align-1)); |
| 462 | |
Christian Krafft | 7c309a6 | 2006-12-06 20:32:41 -0800 | [diff] [blame] | 463 | /* on nodes without memory - bootmem_map is NULL */ |
| 464 | if (!bdata->node_bootmem_map) |
| 465 | return NULL; |
| 466 | |
Johannes Weiner | 2e5237d | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 467 | bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n", |
| 468 | bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT, |
| 469 | align, goal, limit); |
| 470 | |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 471 | /* bdata->node_boot_start is supposed to be (12+6)bits alignment on x86_64 ? */ |
| 472 | node_boot_start = bdata->node_boot_start; |
| 473 | node_bootmem_map = bdata->node_bootmem_map; |
| 474 | if (align) { |
| 475 | node_boot_start = ALIGN(bdata->node_boot_start, align); |
| 476 | if (node_boot_start > bdata->node_boot_start) |
| 477 | node_bootmem_map = (unsigned long *)bdata->node_bootmem_map + |
| 478 | PFN_DOWN(node_boot_start - bdata->node_boot_start)/BITS_PER_LONG; |
| 479 | } |
| 480 | |
| 481 | if (limit && node_boot_start >= limit) |
| 482 | return NULL; |
| 483 | |
Franck Bui-Huu | bbc7b92 | 2006-09-25 23:31:07 -0700 | [diff] [blame] | 484 | end_pfn = bdata->node_low_pfn; |
| 485 | limit = PFN_DOWN(limit); |
Yasunori Goto | 281dd25 | 2005-10-19 15:52:18 -0700 | [diff] [blame] | 486 | if (limit && end_pfn > limit) |
| 487 | end_pfn = limit; |
| 488 | |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 489 | eidx = end_pfn - PFN_DOWN(node_boot_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | |
| 491 | /* |
| 492 | * We try to allocate bootmem pages above 'goal' |
| 493 | * first, then we try to allocate lower pages. |
| 494 | */ |
Yinghai Lu | ad09315 | 2008-03-10 23:23:42 -0700 | [diff] [blame] | 495 | preferred = 0; |
| 496 | if (goal && PFN_DOWN(goal) < end_pfn) { |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 497 | if (goal > node_boot_start) |
| 498 | preferred = goal - node_boot_start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 500 | if (bdata->last_success > node_boot_start && |
| 501 | bdata->last_success - node_boot_start >= preferred) |
Yasunori Goto | 281dd25 | 2005-10-19 15:52:18 -0700 | [diff] [blame] | 502 | if (!limit || (limit && limit > bdata->last_success)) |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 503 | preferred = bdata->last_success - node_boot_start; |
Yinghai Lu | ad09315 | 2008-03-10 23:23:42 -0700 | [diff] [blame] | 504 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 506 | preferred = PFN_DOWN(ALIGN(preferred, align)); |
Franck Bui-Huu | bbc7b92 | 2006-09-25 23:31:07 -0700 | [diff] [blame] | 507 | areasize = (size + PAGE_SIZE-1) / PAGE_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | incr = align >> PAGE_SHIFT ? : 1; |
| 509 | |
| 510 | restart_scan: |
Yinghai Lu | ad09315 | 2008-03-10 23:23:42 -0700 | [diff] [blame] | 511 | for (i = preferred; i < eidx;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | unsigned long j; |
Yinghai Lu | ad09315 | 2008-03-10 23:23:42 -0700 | [diff] [blame] | 513 | |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 514 | i = find_next_zero_bit(node_bootmem_map, eidx, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | i = ALIGN(i, incr); |
Haren Myneni | 66d43e9 | 2005-12-12 00:37:39 -0800 | [diff] [blame] | 516 | if (i >= eidx) |
| 517 | break; |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 518 | if (test_bit(i, node_bootmem_map)) { |
Yinghai Lu | ad09315 | 2008-03-10 23:23:42 -0700 | [diff] [blame] | 519 | i += incr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 520 | continue; |
Yinghai Lu | ad09315 | 2008-03-10 23:23:42 -0700 | [diff] [blame] | 521 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | for (j = i + 1; j < i + areasize; ++j) { |
| 523 | if (j >= eidx) |
| 524 | goto fail_block; |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 525 | if (test_bit(j, node_bootmem_map)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | goto fail_block; |
| 527 | } |
| 528 | start = i; |
| 529 | goto found; |
| 530 | fail_block: |
| 531 | i = ALIGN(j, incr); |
Yinghai Lu | ad09315 | 2008-03-10 23:23:42 -0700 | [diff] [blame] | 532 | if (i == j) |
| 533 | i += incr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | } |
| 535 | |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 536 | if (preferred > 0) { |
| 537 | preferred = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | goto restart_scan; |
| 539 | } |
| 540 | return NULL; |
| 541 | |
| 542 | found: |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 543 | bdata->last_success = PFN_PHYS(start) + node_boot_start; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | BUG_ON(start >= eidx); |
| 545 | |
| 546 | /* |
| 547 | * Is the next page of the previous allocation-end the start |
| 548 | * of this allocation's buffer? If yes then we can 'merge' |
| 549 | * the previous partial page with this allocation. |
| 550 | */ |
| 551 | if (align < PAGE_SIZE && |
| 552 | bdata->last_offset && bdata->last_pos+1 == start) { |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 553 | unsigned long offset, remaining_size; |
Nick Wilson | 8c0e33c | 2005-06-25 14:59:00 -0700 | [diff] [blame] | 554 | offset = ALIGN(bdata->last_offset, align); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | BUG_ON(offset > PAGE_SIZE); |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 556 | remaining_size = PAGE_SIZE - offset; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | if (size < remaining_size) { |
| 558 | areasize = 0; |
| 559 | /* last_pos unchanged */ |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 560 | bdata->last_offset = offset + size; |
| 561 | ret = phys_to_virt(bdata->last_pos * PAGE_SIZE + |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 562 | offset + node_boot_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } else { |
| 564 | remaining_size = size - remaining_size; |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 565 | areasize = (remaining_size + PAGE_SIZE-1) / PAGE_SIZE; |
| 566 | ret = phys_to_virt(bdata->last_pos * PAGE_SIZE + |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 567 | offset + node_boot_start); |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 568 | bdata->last_pos = start + areasize - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | bdata->last_offset = remaining_size; |
| 570 | } |
| 571 | bdata->last_offset &= ~PAGE_MASK; |
| 572 | } else { |
| 573 | bdata->last_pos = start + areasize - 1; |
| 574 | bdata->last_offset = size & ~PAGE_MASK; |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 575 | ret = phys_to_virt(start * PAGE_SIZE + node_boot_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | } |
| 577 | |
Johannes Weiner | 2e5237d | 2008-07-23 21:28:02 -0700 | [diff] [blame] | 578 | bdebug("nid=%td start=%lx end=%lx\n", |
| 579 | bdata - bootmem_node_data, |
| 580 | start + PFN_DOWN(bdata->node_boot_start), |
| 581 | start + areasize + PFN_DOWN(bdata->node_boot_start)); |
| 582 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | /* |
| 584 | * Reserve the area now: |
| 585 | */ |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 586 | for (i = start; i < start + areasize; i++) |
Yinghai Lu | 9a2dc04 | 2008-03-18 12:44:48 -0700 | [diff] [blame] | 587 | if (unlikely(test_and_set_bit(i, node_bootmem_map))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | BUG(); |
| 589 | memset(ret, 0, size); |
| 590 | return ret; |
| 591 | } |
| 592 | |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 593 | /** |
| 594 | * __alloc_bootmem_nopanic - allocate boot memory without panicking |
| 595 | * @size: size of the request in bytes |
| 596 | * @align: alignment of the region |
| 597 | * @goal: preferred starting address of the region |
| 598 | * |
| 599 | * The goal is dropped if it can not be satisfied and the allocation will |
| 600 | * fall back to memory below @goal. |
| 601 | * |
| 602 | * Allocation may happen on any node in the system. |
| 603 | * |
| 604 | * Returns NULL on failure. |
| 605 | */ |
Franck Bui-Huu | bb0923a | 2006-09-25 23:31:05 -0700 | [diff] [blame] | 606 | void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align, |
| 607 | unsigned long goal) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | { |
KAMEZAWA Hiroyuki | 679bc9f | 2006-03-27 01:15:58 -0800 | [diff] [blame] | 609 | bootmem_data_t *bdata; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | void *ptr; |
| 611 | |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 612 | list_for_each_entry(bdata, &bdata_list, list) { |
Johannes Weiner | ffc6421 | 2008-07-23 21:26:59 -0700 | [diff] [blame] | 613 | ptr = alloc_bootmem_core(bdata, size, align, goal, 0); |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 614 | if (ptr) |
| 615 | return ptr; |
| 616 | } |
Andi Kleen | a806223 | 2006-04-07 19:49:21 +0200 | [diff] [blame] | 617 | return NULL; |
| 618 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 620 | /** |
| 621 | * __alloc_bootmem - allocate boot memory |
| 622 | * @size: size of the request in bytes |
| 623 | * @align: alignment of the region |
| 624 | * @goal: preferred starting address of the region |
| 625 | * |
| 626 | * The goal is dropped if it can not be satisfied and the allocation will |
| 627 | * fall back to memory below @goal. |
| 628 | * |
| 629 | * Allocation may happen on any node in the system. |
| 630 | * |
| 631 | * The function panics if the request can not be satisfied. |
| 632 | */ |
Franck Bui-Huu | bb0923a | 2006-09-25 23:31:05 -0700 | [diff] [blame] | 633 | void * __init __alloc_bootmem(unsigned long size, unsigned long align, |
| 634 | unsigned long goal) |
Andi Kleen | a806223 | 2006-04-07 19:49:21 +0200 | [diff] [blame] | 635 | { |
| 636 | void *mem = __alloc_bootmem_nopanic(size,align,goal); |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 637 | |
Andi Kleen | a806223 | 2006-04-07 19:49:21 +0200 | [diff] [blame] | 638 | if (mem) |
| 639 | return mem; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | /* |
| 641 | * Whoops, we cannot satisfy the allocation request. |
| 642 | */ |
| 643 | printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size); |
| 644 | panic("Out of memory"); |
| 645 | return NULL; |
| 646 | } |
| 647 | |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 648 | /** |
| 649 | * __alloc_bootmem_node - allocate boot memory from a specific node |
| 650 | * @pgdat: node to allocate from |
| 651 | * @size: size of the request in bytes |
| 652 | * @align: alignment of the region |
| 653 | * @goal: preferred starting address of the region |
| 654 | * |
| 655 | * The goal is dropped if it can not be satisfied and the allocation will |
| 656 | * fall back to memory below @goal. |
| 657 | * |
| 658 | * Allocation may fall back to any node in the system if the specified node |
| 659 | * can not hold the requested memory. |
| 660 | * |
| 661 | * The function panics if the request can not be satisfied. |
| 662 | */ |
Franck Bui-Huu | bb0923a | 2006-09-25 23:31:05 -0700 | [diff] [blame] | 663 | void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size, |
| 664 | unsigned long align, unsigned long goal) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | { |
| 666 | void *ptr; |
| 667 | |
Johannes Weiner | ffc6421 | 2008-07-23 21:26:59 -0700 | [diff] [blame] | 668 | ptr = alloc_bootmem_core(pgdat->bdata, size, align, goal, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | if (ptr) |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 670 | return ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | |
Ravikiran G Thirumalai | 008857c | 2006-01-06 00:11:01 -0800 | [diff] [blame] | 672 | return __alloc_bootmem(size, align, goal); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | } |
| 674 | |
Yasunori Goto | e70260a | 2008-04-28 02:13:32 -0700 | [diff] [blame] | 675 | #ifdef CONFIG_SPARSEMEM |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 676 | /** |
| 677 | * alloc_bootmem_section - allocate boot memory from a specific section |
| 678 | * @size: size of the request in bytes |
| 679 | * @section_nr: sparse map section to allocate from |
| 680 | * |
| 681 | * Return NULL on failure. |
| 682 | */ |
Yasunori Goto | e70260a | 2008-04-28 02:13:32 -0700 | [diff] [blame] | 683 | void * __init alloc_bootmem_section(unsigned long size, |
| 684 | unsigned long section_nr) |
| 685 | { |
| 686 | void *ptr; |
| 687 | unsigned long limit, goal, start_nr, end_nr, pfn; |
| 688 | struct pglist_data *pgdat; |
| 689 | |
| 690 | pfn = section_nr_to_pfn(section_nr); |
| 691 | goal = PFN_PHYS(pfn); |
| 692 | limit = PFN_PHYS(section_nr_to_pfn(section_nr + 1)) - 1; |
| 693 | pgdat = NODE_DATA(early_pfn_to_nid(pfn)); |
Johannes Weiner | ffc6421 | 2008-07-23 21:26:59 -0700 | [diff] [blame] | 694 | ptr = alloc_bootmem_core(pgdat->bdata, size, SMP_CACHE_BYTES, goal, |
| 695 | limit); |
Yasunori Goto | e70260a | 2008-04-28 02:13:32 -0700 | [diff] [blame] | 696 | |
| 697 | if (!ptr) |
| 698 | return NULL; |
| 699 | |
| 700 | start_nr = pfn_to_section_nr(PFN_DOWN(__pa(ptr))); |
| 701 | end_nr = pfn_to_section_nr(PFN_DOWN(__pa(ptr) + size)); |
| 702 | if (start_nr != section_nr || end_nr != section_nr) { |
| 703 | printk(KERN_WARNING "alloc_bootmem failed on section %ld.\n", |
| 704 | section_nr); |
| 705 | free_bootmem_core(pgdat->bdata, __pa(ptr), size); |
| 706 | ptr = NULL; |
| 707 | } |
| 708 | |
| 709 | return ptr; |
| 710 | } |
| 711 | #endif |
| 712 | |
Andi Kleen | b54bbf7 | 2008-07-23 21:27:45 -0700 | [diff] [blame] | 713 | void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size, |
| 714 | unsigned long align, unsigned long goal) |
| 715 | { |
| 716 | void *ptr; |
| 717 | |
| 718 | ptr = alloc_bootmem_core(pgdat->bdata, size, align, goal, 0); |
| 719 | if (ptr) |
| 720 | return ptr; |
| 721 | |
| 722 | return __alloc_bootmem_nopanic(size, align, goal); |
| 723 | } |
| 724 | |
Heiko Carstens | dfd54cb | 2006-09-25 23:31:33 -0700 | [diff] [blame] | 725 | #ifndef ARCH_LOW_ADDRESS_LIMIT |
| 726 | #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL |
| 727 | #endif |
Ravikiran G Thirumalai | 008857c | 2006-01-06 00:11:01 -0800 | [diff] [blame] | 728 | |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 729 | /** |
| 730 | * __alloc_bootmem_low - allocate low boot memory |
| 731 | * @size: size of the request in bytes |
| 732 | * @align: alignment of the region |
| 733 | * @goal: preferred starting address of the region |
| 734 | * |
| 735 | * The goal is dropped if it can not be satisfied and the allocation will |
| 736 | * fall back to memory below @goal. |
| 737 | * |
| 738 | * Allocation may happen on any node in the system. |
| 739 | * |
| 740 | * The function panics if the request can not be satisfied. |
| 741 | */ |
Franck Bui-Huu | bb0923a | 2006-09-25 23:31:05 -0700 | [diff] [blame] | 742 | void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, |
| 743 | unsigned long goal) |
Ravikiran G Thirumalai | 008857c | 2006-01-06 00:11:01 -0800 | [diff] [blame] | 744 | { |
KAMEZAWA Hiroyuki | 679bc9f | 2006-03-27 01:15:58 -0800 | [diff] [blame] | 745 | bootmem_data_t *bdata; |
Ravikiran G Thirumalai | 008857c | 2006-01-06 00:11:01 -0800 | [diff] [blame] | 746 | void *ptr; |
| 747 | |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 748 | list_for_each_entry(bdata, &bdata_list, list) { |
Johannes Weiner | ffc6421 | 2008-07-23 21:26:59 -0700 | [diff] [blame] | 749 | ptr = alloc_bootmem_core(bdata, size, align, goal, |
| 750 | ARCH_LOW_ADDRESS_LIMIT); |
Franck Bui-Huu | f71bf0c | 2006-09-25 23:31:08 -0700 | [diff] [blame] | 751 | if (ptr) |
| 752 | return ptr; |
| 753 | } |
Ravikiran G Thirumalai | 008857c | 2006-01-06 00:11:01 -0800 | [diff] [blame] | 754 | |
| 755 | /* |
| 756 | * Whoops, we cannot satisfy the allocation request. |
| 757 | */ |
| 758 | printk(KERN_ALERT "low bootmem alloc of %lu bytes failed!\n", size); |
| 759 | panic("Out of low memory"); |
| 760 | return NULL; |
| 761 | } |
| 762 | |
Johannes Weiner | a66fd7d | 2008-07-23 21:28:01 -0700 | [diff] [blame] | 763 | /** |
| 764 | * __alloc_bootmem_low_node - allocate low boot memory from a specific node |
| 765 | * @pgdat: node to allocate from |
| 766 | * @size: size of the request in bytes |
| 767 | * @align: alignment of the region |
| 768 | * @goal: preferred starting address of the region |
| 769 | * |
| 770 | * The goal is dropped if it can not be satisfied and the allocation will |
| 771 | * fall back to memory below @goal. |
| 772 | * |
| 773 | * Allocation may fall back to any node in the system if the specified node |
| 774 | * can not hold the requested memory. |
| 775 | * |
| 776 | * The function panics if the request can not be satisfied. |
| 777 | */ |
Ravikiran G Thirumalai | 008857c | 2006-01-06 00:11:01 -0800 | [diff] [blame] | 778 | void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size, |
| 779 | unsigned long align, unsigned long goal) |
| 780 | { |
Johannes Weiner | ffc6421 | 2008-07-23 21:26:59 -0700 | [diff] [blame] | 781 | return alloc_bootmem_core(pgdat->bdata, size, align, goal, |
| 782 | ARCH_LOW_ADDRESS_LIMIT); |
Ravikiran G Thirumalai | 008857c | 2006-01-06 00:11:01 -0800 | [diff] [blame] | 783 | } |