Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Procedures for maintaining information about logical memory blocks. |
| 3 | * |
| 4 | * Peter Bergner, IBM Corp. June 2001. |
| 5 | * Copyright (C) 2001 Peter Bergner. |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/init.h> |
| 15 | #include <linux/bitops.h> |
| 16 | #include <linux/memblock.h> |
| 17 | |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 18 | struct memblock memblock; |
| 19 | |
| 20 | static int memblock_debug; |
| 21 | |
| 22 | static int __init early_memblock(char *p) |
| 23 | { |
| 24 | if (p && strstr(p, "debug")) |
| 25 | memblock_debug = 1; |
| 26 | return 0; |
| 27 | } |
| 28 | early_param("memblock", early_memblock); |
| 29 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 30 | static void memblock_dump(struct memblock_type *region, char *name) |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 31 | { |
| 32 | unsigned long long base, size; |
| 33 | int i; |
| 34 | |
| 35 | pr_info(" %s.cnt = 0x%lx\n", name, region->cnt); |
| 36 | |
| 37 | for (i = 0; i < region->cnt; i++) { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 38 | base = region->regions[i].base; |
| 39 | size = region->regions[i].size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 40 | |
| 41 | pr_info(" %s[0x%x]\t0x%016llx - 0x%016llx, 0x%llx bytes\n", |
| 42 | name, i, base, base + size - 1, size); |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | void memblock_dump_all(void) |
| 47 | { |
| 48 | if (!memblock_debug) |
| 49 | return; |
| 50 | |
| 51 | pr_info("MEMBLOCK configuration:\n"); |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 52 | pr_info(" memory.size = 0x%llx\n", (unsigned long long)memblock.memory.size); |
| 53 | |
| 54 | memblock_dump(&memblock.memory, "memory"); |
| 55 | memblock_dump(&memblock.reserved, "reserved"); |
| 56 | } |
| 57 | |
| 58 | static unsigned long memblock_addrs_overlap(u64 base1, u64 size1, u64 base2, |
| 59 | u64 size2) |
| 60 | { |
| 61 | return ((base1 < (base2 + size2)) && (base2 < (base1 + size1))); |
| 62 | } |
| 63 | |
| 64 | static long memblock_addrs_adjacent(u64 base1, u64 size1, u64 base2, u64 size2) |
| 65 | { |
| 66 | if (base2 == base1 + size1) |
| 67 | return 1; |
| 68 | else if (base1 == base2 + size2) |
| 69 | return -1; |
| 70 | |
| 71 | return 0; |
| 72 | } |
| 73 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 74 | static long memblock_regions_adjacent(struct memblock_type *type, |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 75 | unsigned long r1, unsigned long r2) |
| 76 | { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 77 | u64 base1 = type->regions[r1].base; |
| 78 | u64 size1 = type->regions[r1].size; |
| 79 | u64 base2 = type->regions[r2].base; |
| 80 | u64 size2 = type->regions[r2].size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 81 | |
| 82 | return memblock_addrs_adjacent(base1, size1, base2, size2); |
| 83 | } |
| 84 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 85 | static void memblock_remove_region(struct memblock_type *type, unsigned long r) |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 86 | { |
| 87 | unsigned long i; |
| 88 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 89 | for (i = r; i < type->cnt - 1; i++) { |
| 90 | type->regions[i].base = type->regions[i + 1].base; |
| 91 | type->regions[i].size = type->regions[i + 1].size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 92 | } |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 93 | type->cnt--; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 94 | } |
| 95 | |
| 96 | /* Assumption: base addr of region 1 < base addr of region 2 */ |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 97 | static void memblock_coalesce_regions(struct memblock_type *type, |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 98 | unsigned long r1, unsigned long r2) |
| 99 | { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 100 | type->regions[r1].size += type->regions[r2].size; |
| 101 | memblock_remove_region(type, r2); |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 102 | } |
| 103 | |
| 104 | void __init memblock_init(void) |
| 105 | { |
| 106 | /* Create a dummy zero size MEMBLOCK which will get coalesced away later. |
| 107 | * This simplifies the memblock_add() code below... |
| 108 | */ |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 109 | memblock.memory.regions[0].base = 0; |
| 110 | memblock.memory.regions[0].size = 0; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 111 | memblock.memory.cnt = 1; |
| 112 | |
| 113 | /* Ditto. */ |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 114 | memblock.reserved.regions[0].base = 0; |
| 115 | memblock.reserved.regions[0].size = 0; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 116 | memblock.reserved.cnt = 1; |
Benjamin Herrenschmidt | e63075a | 2010-07-06 15:39:01 -0700 | [diff] [blame] | 117 | |
| 118 | memblock.current_limit = MEMBLOCK_ALLOC_ANYWHERE; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 119 | } |
| 120 | |
| 121 | void __init memblock_analyze(void) |
| 122 | { |
| 123 | int i; |
| 124 | |
| 125 | memblock.memory.size = 0; |
| 126 | |
| 127 | for (i = 0; i < memblock.memory.cnt; i++) |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 128 | memblock.memory.size += memblock.memory.regions[i].size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 129 | } |
| 130 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 131 | static long memblock_add_region(struct memblock_type *type, u64 base, u64 size) |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 132 | { |
| 133 | unsigned long coalesced = 0; |
| 134 | long adjacent, i; |
| 135 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 136 | if ((type->cnt == 1) && (type->regions[0].size == 0)) { |
| 137 | type->regions[0].base = base; |
| 138 | type->regions[0].size = size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | /* First try and coalesce this MEMBLOCK with another. */ |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 143 | for (i = 0; i < type->cnt; i++) { |
| 144 | u64 rgnbase = type->regions[i].base; |
| 145 | u64 rgnsize = type->regions[i].size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 146 | |
| 147 | if ((rgnbase == base) && (rgnsize == size)) |
| 148 | /* Already have this region, so we're done */ |
| 149 | return 0; |
| 150 | |
| 151 | adjacent = memblock_addrs_adjacent(base, size, rgnbase, rgnsize); |
| 152 | if (adjacent > 0) { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 153 | type->regions[i].base -= size; |
| 154 | type->regions[i].size += size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 155 | coalesced++; |
| 156 | break; |
| 157 | } else if (adjacent < 0) { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 158 | type->regions[i].size += size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 159 | coalesced++; |
| 160 | break; |
| 161 | } |
| 162 | } |
| 163 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 164 | if ((i < type->cnt - 1) && memblock_regions_adjacent(type, i, i+1)) { |
| 165 | memblock_coalesce_regions(type, i, i+1); |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 166 | coalesced++; |
| 167 | } |
| 168 | |
| 169 | if (coalesced) |
| 170 | return coalesced; |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 171 | if (type->cnt >= MAX_MEMBLOCK_REGIONS) |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 172 | return -1; |
| 173 | |
| 174 | /* Couldn't coalesce the MEMBLOCK, so add it to the sorted table. */ |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 175 | for (i = type->cnt - 1; i >= 0; i--) { |
| 176 | if (base < type->regions[i].base) { |
| 177 | type->regions[i+1].base = type->regions[i].base; |
| 178 | type->regions[i+1].size = type->regions[i].size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 179 | } else { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 180 | type->regions[i+1].base = base; |
| 181 | type->regions[i+1].size = size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 182 | break; |
| 183 | } |
| 184 | } |
| 185 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 186 | if (base < type->regions[0].base) { |
| 187 | type->regions[0].base = base; |
| 188 | type->regions[0].size = size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 189 | } |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 190 | type->cnt++; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 191 | |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | long memblock_add(u64 base, u64 size) |
| 196 | { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 197 | return memblock_add_region(&memblock.memory, base, size); |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 198 | |
| 199 | } |
| 200 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 201 | static long __memblock_remove(struct memblock_type *type, u64 base, u64 size) |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 202 | { |
| 203 | u64 rgnbegin, rgnend; |
| 204 | u64 end = base + size; |
| 205 | int i; |
| 206 | |
| 207 | rgnbegin = rgnend = 0; /* supress gcc warnings */ |
| 208 | |
| 209 | /* Find the region where (base, size) belongs to */ |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 210 | for (i=0; i < type->cnt; i++) { |
| 211 | rgnbegin = type->regions[i].base; |
| 212 | rgnend = rgnbegin + type->regions[i].size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 213 | |
| 214 | if ((rgnbegin <= base) && (end <= rgnend)) |
| 215 | break; |
| 216 | } |
| 217 | |
| 218 | /* Didn't find the region */ |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 219 | if (i == type->cnt) |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 220 | return -1; |
| 221 | |
| 222 | /* Check to see if we are removing entire region */ |
| 223 | if ((rgnbegin == base) && (rgnend == end)) { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 224 | memblock_remove_region(type, i); |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | /* Check to see if region is matching at the front */ |
| 229 | if (rgnbegin == base) { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 230 | type->regions[i].base = end; |
| 231 | type->regions[i].size -= size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | /* Check to see if the region is matching at the end */ |
| 236 | if (rgnend == end) { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 237 | type->regions[i].size -= size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 238 | return 0; |
| 239 | } |
| 240 | |
| 241 | /* |
| 242 | * We need to split the entry - adjust the current one to the |
| 243 | * beginging of the hole and add the region after hole. |
| 244 | */ |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 245 | type->regions[i].size = base - type->regions[i].base; |
| 246 | return memblock_add_region(type, end, rgnend - end); |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 247 | } |
| 248 | |
| 249 | long memblock_remove(u64 base, u64 size) |
| 250 | { |
| 251 | return __memblock_remove(&memblock.memory, base, size); |
| 252 | } |
| 253 | |
| 254 | long __init memblock_free(u64 base, u64 size) |
| 255 | { |
| 256 | return __memblock_remove(&memblock.reserved, base, size); |
| 257 | } |
| 258 | |
| 259 | long __init memblock_reserve(u64 base, u64 size) |
| 260 | { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 261 | struct memblock_type *_rgn = &memblock.reserved; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 262 | |
| 263 | BUG_ON(0 == size); |
| 264 | |
| 265 | return memblock_add_region(_rgn, base, size); |
| 266 | } |
| 267 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 268 | long memblock_overlaps_region(struct memblock_type *type, u64 base, u64 size) |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 269 | { |
| 270 | unsigned long i; |
| 271 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 272 | for (i = 0; i < type->cnt; i++) { |
| 273 | u64 rgnbase = type->regions[i].base; |
| 274 | u64 rgnsize = type->regions[i].size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 275 | if (memblock_addrs_overlap(base, size, rgnbase, rgnsize)) |
| 276 | break; |
| 277 | } |
| 278 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 279 | return (i < type->cnt) ? i : -1; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | static u64 memblock_align_down(u64 addr, u64 size) |
| 283 | { |
| 284 | return addr & ~(size - 1); |
| 285 | } |
| 286 | |
| 287 | static u64 memblock_align_up(u64 addr, u64 size) |
| 288 | { |
| 289 | return (addr + (size - 1)) & ~(size - 1); |
| 290 | } |
| 291 | |
Benjamin Herrenschmidt | c3f72b5 | 2010-07-06 15:38:59 -0700 | [diff] [blame] | 292 | static u64 __init memblock_alloc_region(u64 start, u64 end, |
| 293 | u64 size, u64 align) |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 294 | { |
| 295 | u64 base, res_base; |
| 296 | long j; |
| 297 | |
| 298 | base = memblock_align_down((end - size), align); |
| 299 | while (start <= base) { |
| 300 | j = memblock_overlaps_region(&memblock.reserved, base, size); |
| 301 | if (j < 0) { |
| 302 | /* this area isn't reserved, take it */ |
| 303 | if (memblock_add_region(&memblock.reserved, base, size) < 0) |
| 304 | base = ~(u64)0; |
| 305 | return base; |
| 306 | } |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 307 | res_base = memblock.reserved.regions[j].base; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 308 | if (res_base < size) |
| 309 | break; |
| 310 | base = memblock_align_down(res_base - size, align); |
| 311 | } |
| 312 | |
| 313 | return ~(u64)0; |
| 314 | } |
| 315 | |
Benjamin Herrenschmidt | c3f72b5 | 2010-07-06 15:38:59 -0700 | [diff] [blame] | 316 | u64 __weak __init memblock_nid_range(u64 start, u64 end, int *nid) |
| 317 | { |
| 318 | *nid = 0; |
| 319 | |
| 320 | return end; |
| 321 | } |
| 322 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 323 | static u64 __init memblock_alloc_nid_region(struct memblock_region *mp, |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 324 | u64 size, u64 align, int nid) |
| 325 | { |
| 326 | u64 start, end; |
| 327 | |
| 328 | start = mp->base; |
| 329 | end = start + mp->size; |
| 330 | |
| 331 | start = memblock_align_up(start, align); |
| 332 | while (start < end) { |
| 333 | u64 this_end; |
| 334 | int this_nid; |
| 335 | |
Benjamin Herrenschmidt | 35a1f0b | 2010-07-06 15:38:58 -0700 | [diff] [blame] | 336 | this_end = memblock_nid_range(start, end, &this_nid); |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 337 | if (this_nid == nid) { |
Benjamin Herrenschmidt | c3f72b5 | 2010-07-06 15:38:59 -0700 | [diff] [blame] | 338 | u64 ret = memblock_alloc_region(start, this_end, size, align); |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 339 | if (ret != ~(u64)0) |
| 340 | return ret; |
| 341 | } |
| 342 | start = this_end; |
| 343 | } |
| 344 | |
| 345 | return ~(u64)0; |
| 346 | } |
| 347 | |
Benjamin Herrenschmidt | 35a1f0b | 2010-07-06 15:38:58 -0700 | [diff] [blame] | 348 | u64 __init memblock_alloc_nid(u64 size, u64 align, int nid) |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 349 | { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 350 | struct memblock_type *mem = &memblock.memory; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 351 | int i; |
| 352 | |
| 353 | BUG_ON(0 == size); |
| 354 | |
Benjamin Herrenschmidt | c3f72b5 | 2010-07-06 15:38:59 -0700 | [diff] [blame] | 355 | /* We do a bottom-up search for a region with the right |
| 356 | * nid since that's easier considering how memblock_nid_range() |
| 357 | * works |
| 358 | */ |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 359 | size = memblock_align_up(size, align); |
| 360 | |
| 361 | for (i = 0; i < mem->cnt; i++) { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 362 | u64 ret = memblock_alloc_nid_region(&mem->regions[i], |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 363 | size, align, nid); |
| 364 | if (ret != ~(u64)0) |
| 365 | return ret; |
| 366 | } |
| 367 | |
| 368 | return memblock_alloc(size, align); |
| 369 | } |
| 370 | |
| 371 | u64 __init memblock_alloc(u64 size, u64 align) |
| 372 | { |
Benjamin Herrenschmidt | e63075a | 2010-07-06 15:39:01 -0700 | [diff] [blame] | 373 | return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE); |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 374 | } |
| 375 | |
| 376 | u64 __init memblock_alloc_base(u64 size, u64 align, u64 max_addr) |
| 377 | { |
| 378 | u64 alloc; |
| 379 | |
| 380 | alloc = __memblock_alloc_base(size, align, max_addr); |
| 381 | |
| 382 | if (alloc == 0) |
| 383 | panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n", |
| 384 | (unsigned long long) size, (unsigned long long) max_addr); |
| 385 | |
| 386 | return alloc; |
| 387 | } |
| 388 | |
| 389 | u64 __init __memblock_alloc_base(u64 size, u64 align, u64 max_addr) |
| 390 | { |
Benjamin Herrenschmidt | c3f72b5 | 2010-07-06 15:38:59 -0700 | [diff] [blame] | 391 | long i; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 392 | u64 base = 0; |
| 393 | u64 res_base; |
| 394 | |
| 395 | BUG_ON(0 == size); |
| 396 | |
| 397 | size = memblock_align_up(size, align); |
| 398 | |
Benjamin Herrenschmidt | c3f72b5 | 2010-07-06 15:38:59 -0700 | [diff] [blame] | 399 | /* Pump up max_addr */ |
Benjamin Herrenschmidt | e63075a | 2010-07-06 15:39:01 -0700 | [diff] [blame] | 400 | if (max_addr == MEMBLOCK_ALLOC_ACCESSIBLE) |
| 401 | max_addr = memblock.current_limit; |
Benjamin Herrenschmidt | c3f72b5 | 2010-07-06 15:38:59 -0700 | [diff] [blame] | 402 | |
| 403 | /* We do a top-down search, this tends to limit memory |
| 404 | * fragmentation by keeping early boot allocs near the |
| 405 | * top of memory |
| 406 | */ |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 407 | for (i = memblock.memory.cnt - 1; i >= 0; i--) { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 408 | u64 memblockbase = memblock.memory.regions[i].base; |
| 409 | u64 memblocksize = memblock.memory.regions[i].size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 410 | |
| 411 | if (memblocksize < size) |
| 412 | continue; |
Benjamin Herrenschmidt | c3f72b5 | 2010-07-06 15:38:59 -0700 | [diff] [blame] | 413 | base = min(memblockbase + memblocksize, max_addr); |
| 414 | res_base = memblock_alloc_region(memblockbase, base, size, align); |
| 415 | if (res_base != ~(u64)0) |
| 416 | return res_base; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 417 | } |
| 418 | return 0; |
| 419 | } |
| 420 | |
| 421 | /* You must call memblock_analyze() before this. */ |
| 422 | u64 __init memblock_phys_mem_size(void) |
| 423 | { |
| 424 | return memblock.memory.size; |
| 425 | } |
| 426 | |
| 427 | u64 memblock_end_of_DRAM(void) |
| 428 | { |
| 429 | int idx = memblock.memory.cnt - 1; |
| 430 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 431 | return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size); |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 432 | } |
| 433 | |
| 434 | /* You must call memblock_analyze() after this. */ |
| 435 | void __init memblock_enforce_memory_limit(u64 memory_limit) |
| 436 | { |
| 437 | unsigned long i; |
| 438 | u64 limit; |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 439 | struct memblock_region *p; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 440 | |
| 441 | if (!memory_limit) |
| 442 | return; |
| 443 | |
| 444 | /* Truncate the memblock regions to satisfy the memory limit. */ |
| 445 | limit = memory_limit; |
| 446 | for (i = 0; i < memblock.memory.cnt; i++) { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 447 | if (limit > memblock.memory.regions[i].size) { |
| 448 | limit -= memblock.memory.regions[i].size; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 449 | continue; |
| 450 | } |
| 451 | |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 452 | memblock.memory.regions[i].size = limit; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 453 | memblock.memory.cnt = i + 1; |
| 454 | break; |
| 455 | } |
| 456 | |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 457 | memory_limit = memblock_end_of_DRAM(); |
| 458 | |
| 459 | /* And truncate any reserves above the limit also. */ |
| 460 | for (i = 0; i < memblock.reserved.cnt; i++) { |
Benjamin Herrenschmidt | e3239ff | 2010-08-04 14:06:41 +1000 | [diff] [blame] | 461 | p = &memblock.reserved.regions[i]; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 462 | |
| 463 | if (p->base > memory_limit) |
| 464 | p->size = 0; |
| 465 | else if ((p->base + p->size) > memory_limit) |
| 466 | p->size = memory_limit - p->base; |
| 467 | |
| 468 | if (p->size == 0) { |
| 469 | memblock_remove_region(&memblock.reserved, i); |
| 470 | i--; |
| 471 | } |
| 472 | } |
| 473 | } |
| 474 | |
Benjamin Herrenschmidt | 72d4b0b | 2010-08-04 14:38:47 +1000 | [diff] [blame] | 475 | static int memblock_search(struct memblock_type *type, u64 addr) |
| 476 | { |
| 477 | unsigned int left = 0, right = type->cnt; |
| 478 | |
| 479 | do { |
| 480 | unsigned int mid = (right + left) / 2; |
| 481 | |
| 482 | if (addr < type->regions[mid].base) |
| 483 | right = mid; |
| 484 | else if (addr >= (type->regions[mid].base + |
| 485 | type->regions[mid].size)) |
| 486 | left = mid + 1; |
| 487 | else |
| 488 | return mid; |
| 489 | } while (left < right); |
| 490 | return -1; |
| 491 | } |
| 492 | |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 493 | int __init memblock_is_reserved(u64 addr) |
| 494 | { |
Benjamin Herrenschmidt | 72d4b0b | 2010-08-04 14:38:47 +1000 | [diff] [blame] | 495 | return memblock_search(&memblock.reserved, addr) != -1; |
| 496 | } |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 497 | |
Benjamin Herrenschmidt | 72d4b0b | 2010-08-04 14:38:47 +1000 | [diff] [blame] | 498 | int memblock_is_memory(u64 addr) |
| 499 | { |
| 500 | return memblock_search(&memblock.memory, addr) != -1; |
| 501 | } |
| 502 | |
| 503 | int memblock_is_region_memory(u64 base, u64 size) |
| 504 | { |
| 505 | int idx = memblock_search(&memblock.reserved, base); |
| 506 | |
| 507 | if (idx == -1) |
| 508 | return 0; |
| 509 | return memblock.reserved.regions[idx].base <= base && |
| 510 | (memblock.reserved.regions[idx].base + |
| 511 | memblock.reserved.regions[idx].size) >= (base + size); |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 512 | } |
| 513 | |
| 514 | int memblock_is_region_reserved(u64 base, u64 size) |
| 515 | { |
Benjamin Herrenschmidt | f1c2c19 | 2010-08-04 14:17:17 +1000 | [diff] [blame] | 516 | return memblock_overlaps_region(&memblock.reserved, base, size) >= 0; |
Yinghai Lu | 95f72d1 | 2010-07-12 14:36:09 +1000 | [diff] [blame] | 517 | } |
| 518 | |
Benjamin Herrenschmidt | e63075a | 2010-07-06 15:39:01 -0700 | [diff] [blame] | 519 | |
| 520 | void __init memblock_set_current_limit(u64 limit) |
| 521 | { |
| 522 | memblock.current_limit = limit; |
| 523 | } |
| 524 | |