mm/memblock.c

   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/slab.h>
  15 #include <linux/init.h>
  16 #include <linux/bitops.h>
  17 #include <linux/poison.h>
  18 #include <linux/pfn.h>
  19 #include <linux/debugfs.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/memblock.h>
  22
  23 struct memblock memblock __initdata_memblock;
  24
  25 int memblock_debug __initdata_memblock;
  26 int memblock_can_resize __initdata_memblock;
  27 static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS + 1] __initdata_memblock;
  28 static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS + 1] __initdata_memblock;
  29
  30 /* inline so we don't get a warning when pr_debug is compiled out */
  31 static inline const char *memblock_type_name(struct memblock_type *type)
  32 {
  33         if (type == &memblock.memory)
  34                 return "memory";
  35         else if (type == &memblock.reserved)
  36                 return "reserved";
  37         else
  38                 return "unknown";
  39 }
  40
  41 /*
  42  * Address comparison utilities
  43  */
  44
  45 static phys_addr_t __init_memblock memblock_align_down(phys_addr_t addr, phys_addr_t size)
  46 {
  47         return addr & ~(size - 1);
  48 }
  49
  50 static phys_addr_t __init_memblock memblock_align_up(phys_addr_t addr, phys_addr_t size)
  51 {
  52         return (addr + (size - 1)) & ~(size - 1);
  53 }
  54
  55 static unsigned long __init_memblock memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1,
  56                                        phys_addr_t base2, phys_addr_t size2)
  57 {
  58         return ((base1 < (base2 + size2)) && (base2 < (base1 + size1)));
  59 }
  60
  61 long __init_memblock memblock_overlaps_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
  62 {
  63         unsigned long i;
  64
  65         for (i = 0; i < type->cnt; i++) {
  66                 phys_addr_t rgnbase = type->regions[i].base;
  67                 phys_addr_t rgnsize = type->regions[i].size;
  68                 if (memblock_addrs_overlap(base, size, rgnbase, rgnsize))
  69                         break;
  70         }
  71
  72         return (i < type->cnt) ? i : -1;
  73 }
  74
  75 /*
  76  * Find, allocate, deallocate or reserve unreserved regions. All allocations
  77  * are top-down.
  78  */
  79
  80 static phys_addr_t __init_memblock memblock_find_region(phys_addr_t start, phys_addr_t end,
  81                                           phys_addr_t size, phys_addr_t align)
  82 {
  83         phys_addr_t base, res_base;
  84         long j;
  85
  86         /* In case, huge size is requested */
  87         if (end < size)
  88                 return MEMBLOCK_ERROR;
  89
  90         base = memblock_align_down((end - size), align);
  91
  92         /* Prevent allocations returning 0 as it's also used to
  93          * indicate an allocation failure
  94          */
  95         if (start == 0)
  96                 start = PAGE_SIZE;
  97
  98         while (start <= base) {
  99                 j = memblock_overlaps_region(&memblock.reserved, base, size);
 100                 if (j < 0)
 101                         return base;
 102                 res_base = memblock.reserved.regions[j].base;
 103                 if (res_base < size)
 104                         break;
 105                 base = memblock_align_down(res_base - size, align);
 106         }
 107
 108         return MEMBLOCK_ERROR;
 109 }
 110
 111 static phys_addr_t __init_memblock memblock_find_base(phys_addr_t size,
 112                         phys_addr_t align, phys_addr_t start, phys_addr_t end)
 113 {
 114         long i;
 115
 116         BUG_ON(0 == size);
 117
 118         /* Pump up max_addr */
 119         if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
 120                 end = memblock.current_limit;
 121
 122         /* We do a top-down search, this tends to limit memory
 123          * fragmentation by keeping early boot allocs near the
 124          * top of memory
 125          */
 126         for (i = memblock.memory.cnt - 1; i >= 0; i--) {
 127                 phys_addr_t memblockbase = memblock.memory.regions[i].base;
 128                 phys_addr_t memblocksize = memblock.memory.regions[i].size;
 129                 phys_addr_t bottom, top, found;
 130
 131                 if (memblocksize < size)
 132                         continue;
 133                 if ((memblockbase + memblocksize) <= start)
 134                         break;
 135                 bottom = max(memblockbase, start);
 136                 top = min(memblockbase + memblocksize, end);
 137                 if (bottom >= top)
 138                         continue;
 139                 found = memblock_find_region(bottom, top, size, align);
 140                 if (found != MEMBLOCK_ERROR)
 141                         return found;
 142         }
 143         return MEMBLOCK_ERROR;
 144 }
 145
 146 /*
 147  * Find a free area with specified alignment in a specific range.
 148  */
 149 u64 __init_memblock memblock_find_in_range(u64 start, u64 end, u64 size, u64 align)
 150 {
 151         return memblock_find_base(size, align, start, end);
 152 }
 153
 154 /*
 155  * Free memblock.reserved.regions
 156  */
 157 int __init_memblock memblock_free_reserved_regions(void)
 158 {
 159         if (memblock.reserved.regions == memblock_reserved_init_regions)
 160                 return 0;
 161
 162         return memblock_free(__pa(memblock.reserved.regions),
 163                  sizeof(struct memblock_region) * memblock.reserved.max);
 164 }
 165
 166 /*
 167  * Reserve memblock.reserved.regions
 168  */
 169 int __init_memblock memblock_reserve_reserved_regions(void)
 170 {
 171         if (memblock.reserved.regions == memblock_reserved_init_regions)
 172                 return 0;
 173
 174         return memblock_reserve(__pa(memblock.reserved.regions),
 175                  sizeof(struct memblock_region) * memblock.reserved.max);
 176 }
 177
 178 static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r)
 179 {
 180         unsigned long i;
 181
 182         for (i = r; i < type->cnt - 1; i++) {
 183                 type->regions[i].base = type->regions[i + 1].base;
 184                 type->regions[i].size = type->regions[i + 1].size;
 185         }
 186         type->cnt--;
 187
 188         /* Special case for empty arrays */
 189         if (type->cnt == 0) {
 190                 type->cnt = 1;
 191                 type->regions[0].base = 0;
 192                 type->regions[0].size = 0;
 193         }
 194 }
 195
 196 /* Defined below but needed now */
 197 static long memblock_add_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size);
 198
 199 static int __init_memblock memblock_double_array(struct memblock_type *type)
 200 {
 201         struct memblock_region *new_array, *old_array;
 202         phys_addr_t old_size, new_size, addr;
 203         int use_slab = slab_is_available();
 204
 205         /* We don't allow resizing until we know about the reserved regions
 206          * of memory that aren't suitable for allocation
 207          */
 208         if (!memblock_can_resize)
 209                 return -1;
 210
 211         /* Calculate new doubled size */
 212         old_size = type->max * sizeof(struct memblock_region);
 213         new_size = old_size << 1;
 214
 215         /* Try to find some space for it.
 216          *
 217          * WARNING: We assume that either slab_is_available() and we use it or
 218          * we use MEMBLOCK for allocations. That means that this is unsafe to use
 219          * when bootmem is currently active (unless bootmem itself is implemented
 220          * on top of MEMBLOCK which isn't the case yet)
 221          *
 222          * This should however not be an issue for now, as we currently only
 223          * call into MEMBLOCK while it's still active, or much later when slab is
 224          * active for memory hotplug operations
 225          */
 226         if (use_slab) {
 227                 new_array = kmalloc(new_size, GFP_KERNEL);
 228                 addr = new_array == NULL ? MEMBLOCK_ERROR : __pa(new_array);
 229         } else
 230                 addr = memblock_find_base(new_size, sizeof(phys_addr_t), 0, MEMBLOCK_ALLOC_ACCESSIBLE);
 231         if (addr == MEMBLOCK_ERROR) {
 232                 pr_err("memblock: Failed to double %s array from %ld to %ld entries !\n",
 233                        memblock_type_name(type), type->max, type->max * 2);
 234                 return -1;
 235         }
 236         new_array = __va(addr);
 237
 238         memblock_dbg("memblock: %s array is doubled to %ld at [%#010llx-%#010llx]",
 239                  memblock_type_name(type), type->max * 2, (u64)addr, (u64)addr + new_size - 1);
 240
 241         /* Found space, we now need to move the array over before
 242          * we add the reserved region since it may be our reserved
 243          * array itself that is full.
 244          */
 245         memcpy(new_array, type->regions, old_size);
 246         memset(new_array + type->max, 0, old_size);
 247         old_array = type->regions;
 248         type->regions = new_array;
 249         type->max <<= 1;
 250
 251         /* If we use SLAB that's it, we are done */
 252         if (use_slab)
 253                 return 0;
 254
 255         /* Add the new reserved region now. Should not fail ! */
 256         BUG_ON(memblock_add_region(&memblock.reserved, addr, new_size));
 257
 258         /* If the array wasn't our static init one, then free it. We only do
 259          * that before SLAB is available as later on, we don't know whether
 260          * to use kfree or free_bootmem_pages(). Shouldn't be a big deal
 261          * anyways
 262          */
 263         if (old_array != memblock_memory_init_regions &&
 264             old_array != memblock_reserved_init_regions)
 265                 memblock_free(__pa(old_array), old_size);
 266
 267         return 0;
 268 }
 269
 270 extern int __init_memblock __weak memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
 271                                           phys_addr_t addr2, phys_addr_t size2)
 272 {
 273         return 1;
 274 }
 275
 276 static long __init_memblock memblock_add_region(struct memblock_type *type,
 277                                                 phys_addr_t base, phys_addr_t size)
 278 {
 279         phys_addr_t end = base + size;
 280         int i, slot = -1;
 281
 282         /* First try and coalesce this MEMBLOCK with others */
 283         for (i = 0; i < type->cnt; i++) {
 284                 struct memblock_region *rgn = &type->regions[i];
 285                 phys_addr_t rend = rgn->base + rgn->size;
 286
 287                 /* Exit if there's no possible hits */
 288                 if (rgn->base > end || rgn->size == 0)
 289                         break;
 290
 291                 /* Check if we are fully enclosed within an existing
 292                  * block
 293                  */
 294                 if (rgn->base <= base && rend >= end)
 295                         return 0;
 296
 297                 /* Check if we overlap or are adjacent with the bottom
 298                  * of a block.
 299                  */
 300                 if (base < rgn->base && end >= rgn->base) {
 301                         /* If we can't coalesce, create a new block */
 302                         if (!memblock_memory_can_coalesce(base, size,
 303                                                           rgn->base,
 304                                                           rgn->size)) {
 305                                 /* Overlap & can't coalesce are mutually
 306                                  * exclusive, if you do that, be prepared
 307                                  * for trouble
 308                                  */
 309                                 WARN_ON(end != rgn->base);
 310                                 goto new_block;
 311                         }
 312                         /* We extend the bottom of the block down to our
 313                          * base
 314                          */
 315                         rgn->base = base;
 316                         rgn->size = rend - base;
 317
 318                         /* Return if we have nothing else to allocate
 319                          * (fully coalesced)
 320                          */
 321                         if (rend >= end)
 322                                 return 0;
 323
 324                         /* We continue processing from the end of the
 325                          * coalesced block.
 326                          */
 327                         base = rend;
 328                         size = end - base;
 329                 }
 330
 331                 /* Now check if we overlap or are adjacent with the
 332                  * top of a block
 333                  */
 334                 if (base <= rend && end >= rend) {
 335                         /* If we can't coalesce, create a new block */
 336                         if (!memblock_memory_can_coalesce(rgn->base,
 337                                                           rgn->size,
 338                                                           base, size)) {
 339                                 /* Overlap & can't coalesce are mutually
 340                                  * exclusive, if you do that, be prepared
 341                                  * for trouble
 342                                  */
 343                                 WARN_ON(rend != base);
 344                                 goto new_block;
 345                         }
 346                         /* We adjust our base down to enclose the
 347                          * original block and destroy it. It will be
 348                          * part of our new allocation. Since we've
 349                          * freed an entry, we know we won't fail
 350                          * to allocate one later, so we won't risk
 351                          * losing the original block allocation.
 352                          */
 353                         size += (base - rgn->base);
 354                         base = rgn->base;
 355                         memblock_remove_region(type, i--);
 356                 }
 357         }
 358
 359         /* If the array is empty, special case, replace the fake
 360          * filler region and return
 361          */
 362         if ((type->cnt == 1) && (type->regions[0].size == 0)) {
 363                 type->regions[0].base = base;
 364                 type->regions[0].size = size;
 365                 return 0;
 366         }
 367
 368  new_block:
 369         /* If we are out of space, we fail. It's too late to resize the array
 370          * but then this shouldn't have happened in the first place.
 371          */
 372         if (WARN_ON(type->cnt >= type->max))
 373                 return -1;
 374
 375         /* Couldn't coalesce the MEMBLOCK, so add it to the sorted table. */
 376         for (i = type->cnt - 1; i >= 0; i--) {
 377                 if (base < type->regions[i].base) {
 378                         type->regions[i+1].base = type->regions[i].base;
 379                         type->regions[i+1].size = type->regions[i].size;
 380                 } else {
 381                         type->regions[i+1].base = base;
 382                         type->regions[i+1].size = size;
 383                         slot = i + 1;
 384                         break;
 385                 }
 386         }
 387         if (base < type->regions[0].base) {
 388                 type->regions[0].base = base;
 389                 type->regions[0].size = size;
 390                 slot = 0;
 391         }
 392         type->cnt++;
 393
 394         /* The array is full ? Try to resize it. If that fails, we undo
 395          * our allocation and return an error
 396          */
 397         if (type->cnt == type->max && memblock_double_array(type)) {
 398                 BUG_ON(slot < 0);
 399                 memblock_remove_region(type, slot);
 400                 return -1;
 401         }
 402
 403         return 0;
 404 }
 405
 406 long __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
 407 {
 408         return memblock_add_region(&memblock.memory, base, size);
 409
 410 }
 411
 412 static long __init_memblock __memblock_remove(struct memblock_type *type,
 413                                               phys_addr_t base, phys_addr_t size)
 414 {
 415         phys_addr_t end = base + size;
 416         int i;
 417
 418         /* Walk through the array for collisions */
 419         for (i = 0; i < type->cnt; i++) {
 420                 struct memblock_region *rgn = &type->regions[i];
 421                 phys_addr_t rend = rgn->base + rgn->size;
 422
 423                 /* Nothing more to do, exit */
 424                 if (rgn->base > end || rgn->size == 0)
 425                         break;
 426
 427                 /* If we fully enclose the block, drop it */
 428                 if (base <= rgn->base && end >= rend) {
 429                         memblock_remove_region(type, i--);
 430                         continue;
 431                 }
 432
 433                 /* If we are fully enclosed within a block
 434                  * then we need to split it and we are done
 435                  */
 436                 if (base > rgn->base && end < rend) {
 437                         rgn->size = base - rgn->base;
 438                         if (!memblock_add_region(type, end, rend - end))
 439                                 return 0;
 440                         /* Failure to split is bad, we at least
 441                          * restore the block before erroring
 442                          */
 443                         rgn->size = rend - rgn->base;
 444                         WARN_ON(1);
 445                         return -1;
 446                 }
 447
 448                 /* Check if we need to trim the bottom of a block */
 449                 if (rgn->base < end && rend > end) {
 450                         rgn->size -= end - rgn->base;
 451                         rgn->base = end;
 452                         break;
 453                 }
 454
 455                 /* And check if we need to trim the top of a block */
 456                 if (base < rend)
 457                         rgn->size -= rend - base;
 458
 459         }
 460         return 0;
 461 }
 462
 463 long __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size)
 464 {
 465         return __memblock_remove(&memblock.memory, base, size);
 466 }
 467
 468 long __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
 469 {
 470         return __memblock_remove(&memblock.reserved, base, size);
 471 }
 472
 473 long __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
 474 {
 475         struct memblock_type *_rgn = &memblock.reserved;
 476
 477         BUG_ON(0 == size);
 478
 479         return memblock_add_region(_rgn, base, size);
 480 }
 481
 482 phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
 483 {
 484         phys_addr_t found;
 485
 486         /* We align the size to limit fragmentation. Without this, a lot of
 487          * small allocs quickly eat up the whole reserve array on sparc
 488          */
 489         size = memblock_align_up(size, align);
 490
 491         found = memblock_find_base(size, align, 0, max_addr);
 492         if (found != MEMBLOCK_ERROR &&
 493             !memblock_add_region(&memblock.reserved, found, size))
 494                 return found;
 495
 496         return 0;
 497 }
 498
 499 phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
 500 {
 501         phys_addr_t alloc;
 502
 503         alloc = __memblock_alloc_base(size, align, max_addr);
 504
 505         if (alloc == 0)
 506                 panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n",
 507                       (unsigned long long) size, (unsigned long long) max_addr);
 508
 509         return alloc;
 510 }
 511
 512 phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align)
 513 {
 514         return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
 515 }
 516
 517
 518 /*
 519  * Additional node-local allocators. Search for node memory is bottom up
 520  * and walks memblock regions within that node bottom-up as well, but allocation
 521  * within an memblock region is top-down. XXX I plan to fix that at some stage
 522  *
 523  * WARNING: Only available after early_node_map[] has been populated,
 524  * on some architectures, that is after all the calls to add_active_range()
 525  * have been done to populate it.
 526  */
 527
 528 phys_addr_t __weak __init memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid)
 529 {
 530 #ifdef CONFIG_ARCH_POPULATES_NODE_MAP
 531         /*
 532          * This code originates from sparc which really wants use to walk by addresses
 533          * and returns the nid. This is not very convenient for early_pfn_map[] users
 534          * as the map isn't sorted yet, and it really wants to be walked by nid.
 535          *
 536          * For now, I implement the inefficient method below which walks the early
 537          * map multiple times. Eventually we may want to use an ARCH config option
 538          * to implement a completely different method for both case.
 539          */
 540         unsigned long start_pfn, end_pfn;
 541         int i;
 542
 543         for (i = 0; i < MAX_NUMNODES; i++) {
 544                 get_pfn_range_for_nid(i, &start_pfn, &end_pfn);
 545                 if (start < PFN_PHYS(start_pfn) || start >= PFN_PHYS(end_pfn))
 546                         continue;
 547                 *nid = i;
 548                 return min(end, PFN_PHYS(end_pfn));
 549         }
 550 #endif
 551         *nid = 0;
 552
 553         return end;
 554 }
 555
 556 static phys_addr_t __init memblock_alloc_nid_region(struct memblock_region *mp,
 557                                                phys_addr_t size,
 558                                                phys_addr_t align, int nid)
 559 {
 560         phys_addr_t start, end;
 561
 562         start = mp->base;
 563         end = start + mp->size;
 564
 565         start = memblock_align_up(start, align);
 566         while (start < end) {
 567                 phys_addr_t this_end;
 568                 int this_nid;
 569
 570                 this_end = memblock_nid_range(start, end, &this_nid);
 571                 if (this_nid == nid) {
 572                         phys_addr_t ret = memblock_find_region(start, this_end, size, align);
 573                         if (ret != MEMBLOCK_ERROR &&
 574                             !memblock_add_region(&memblock.reserved, ret, size))
 575                                 return ret;
 576                 }
 577                 start = this_end;
 578         }
 579
 580         return MEMBLOCK_ERROR;
 581 }
 582
 583 phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
 584 {
 585         struct memblock_type *mem = &memblock.memory;
 586         int i;
 587
 588         BUG_ON(0 == size);
 589
 590         /* We align the size to limit fragmentation. Without this, a lot of
 591          * small allocs quickly eat up the whole reserve array on sparc
 592          */
 593         size = memblock_align_up(size, align);
 594
 595         /* We do a bottom-up search for a region with the right
 596          * nid since that's easier considering how memblock_nid_range()
 597          * works
 598          */
 599         for (i = 0; i < mem->cnt; i++) {
 600                 phys_addr_t ret = memblock_alloc_nid_region(&mem->regions[i],
 601                                                size, align, nid);
 602                 if (ret != MEMBLOCK_ERROR)
 603                         return ret;
 604         }
 605
 606         return 0;
 607 }
 608
 609 phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid)
 610 {
 611         phys_addr_t res = memblock_alloc_nid(size, align, nid);
 612
 613         if (res)
 614                 return res;
 615         return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
 616 }
 617
 618
 619 /*
 620  * Remaining API functions
 621  */
 622
 623 /* You must call memblock_analyze() before this. */
 624 phys_addr_t __init memblock_phys_mem_size(void)
 625 {
 626         return memblock.memory_size;
 627 }
 628
 629 /* lowest address */
 630 phys_addr_t __init_memblock memblock_start_of_DRAM(void)
 631 {
 632         return memblock.memory.regions[0].base;
 633 }
 634
 635 phys_addr_t __init_memblock memblock_end_of_DRAM(void)
 636 {
 637         int idx = memblock.memory.cnt - 1;
 638
 639         return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size);
 640 }
 641
 642 /* You must call memblock_analyze() after this. */
 643 void __init memblock_enforce_memory_limit(phys_addr_t memory_limit)
 644 {
 645         unsigned long i;
 646         phys_addr_t limit;
 647         struct memblock_region *p;
 648
 649         if (!memory_limit)
 650                 return;
 651
 652         /* Truncate the memblock regions to satisfy the memory limit. */
 653         limit = memory_limit;
 654         for (i = 0; i < memblock.memory.cnt; i++) {
 655                 if (limit > memblock.memory.regions[i].size) {
 656                         limit -= memblock.memory.regions[i].size;
 657                         continue;
 658                 }
 659
 660                 memblock.memory.regions[i].size = limit;
 661                 memblock.memory.cnt = i + 1;
 662                 break;
 663         }
 664
 665         memory_limit = memblock_end_of_DRAM();
 666
 667         /* And truncate any reserves above the limit also. */
 668         for (i = 0; i < memblock.reserved.cnt; i++) {
 669                 p = &memblock.reserved.regions[i];
 670
 671                 if (p->base > memory_limit)
 672                         p->size = 0;
 673                 else if ((p->base + p->size) > memory_limit)
 674                         p->size = memory_limit - p->base;
 675
 676                 if (p->size == 0) {
 677                         memblock_remove_region(&memblock.reserved, i);
 678                         i--;
 679                 }
 680         }
 681 }
 682
 683 static int __init_memblock memblock_search(struct memblock_type *type, phys_addr_t addr)
 684 {
 685         unsigned int left = 0, right = type->cnt;
 686
 687         do {
 688                 unsigned int mid = (right + left) / 2;
 689
 690                 if (addr < type->regions[mid].base)
 691                         right = mid;
 692                 else if (addr >= (type->regions[mid].base +
 693                                   type->regions[mid].size))
 694                         left = mid + 1;
 695                 else
 696                         return mid;
 697         } while (left < right);
 698         return -1;
 699 }
 700
 701 int __init memblock_is_reserved(phys_addr_t addr)
 702 {
 703         return memblock_search(&memblock.reserved, addr) != -1;
 704 }
 705
 706 int __init_memblock memblock_is_memory(phys_addr_t addr)
 707 {
 708         return memblock_search(&memblock.memory, addr) != -1;
 709 }
 710
 711 int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
 712 {
 713         int idx = memblock_search(&memblock.memory, base);
 714
 715         if (idx == -1)
 716                 return 0;
 717         return memblock.memory.regions[idx].base <= base &&
 718                 (memblock.memory.regions[idx].base +
 719                  memblock.memory.regions[idx].size) >= (base + size);
 720 }
 721
 722 int __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
 723 {
 724         return memblock_overlaps_region(&memblock.reserved, base, size) >= 0;
 725 }
 726
 727
 728 void __init_memblock memblock_set_current_limit(phys_addr_t limit)
 729 {
 730         memblock.current_limit = limit;
 731 }
 732
 733 static void __init_memblock memblock_dump(struct memblock_type *region, char *name)
 734 {
 735         unsigned long long base, size;
 736         int i;
 737
 738         pr_info(" %s.cnt  = 0x%lx\n", name, region->cnt);
 739
 740         for (i = 0; i < region->cnt; i++) {
 741                 base = region->regions[i].base;
 742                 size = region->regions[i].size;
 743
 744                 pr_info(" %s[%#x]\t[%#016llx-%#016llx], %#llx bytes\n",
 745                     name, i, base, base + size - 1, size);
 746         }
 747 }
 748
 749 void __init_memblock memblock_dump_all(void)
 750 {
 751         if (!memblock_debug)
 752                 return;
 753
 754         pr_info("MEMBLOCK configuration:\n");
 755         pr_info(" memory size = 0x%llx\n", (unsigned long long)memblock.memory_size);
 756
 757         memblock_dump(&memblock.memory, "memory");
 758         memblock_dump(&memblock.reserved, "reserved");
 759 }
 760
 761 void __init memblock_analyze(void)
 762 {
 763         int i;
 764
 765         /* Check marker in the unused last array entry */
 766         WARN_ON(memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS].base
 767                 != MEMBLOCK_INACTIVE);
 768         WARN_ON(memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS].base
 769                 != MEMBLOCK_INACTIVE);
 770
 771         memblock.memory_size = 0;
 772
 773         for (i = 0; i < memblock.memory.cnt; i++)
 774                 memblock.memory_size += memblock.memory.regions[i].size;
 775
 776         /* We allow resizing from there */
 777         memblock_can_resize = 1;
 778 }
 779
 780 void __init memblock_init(void)
 781 {
 782         static int init_done __initdata = 0;
 783
 784         if (init_done)
 785                 return;
 786         init_done = 1;
 787
 788         /* Hookup the initial arrays */
 789         memblock.memory.regions = memblock_memory_init_regions;
 790         memblock.memory.max             = INIT_MEMBLOCK_REGIONS;
 791         memblock.reserved.regions       = memblock_reserved_init_regions;
 792         memblock.reserved.max   = INIT_MEMBLOCK_REGIONS;
 793
 794         /* Write a marker in the unused last array entry */
 795         memblock.memory.regions[INIT_MEMBLOCK_REGIONS].base = MEMBLOCK_INACTIVE;
 796         memblock.reserved.regions[INIT_MEMBLOCK_REGIONS].base = MEMBLOCK_INACTIVE;
 797
 798         /* Create a dummy zero size MEMBLOCK which will get coalesced away later.
 799          * This simplifies the memblock_add() code below...
 800          */
 801         memblock.memory.regions[0].base = 0;
 802         memblock.memory.regions[0].size = 0;
 803         memblock.memory.cnt = 1;
 804
 805         /* Ditto. */
 806         memblock.reserved.regions[0].base = 0;
 807         memblock.reserved.regions[0].size = 0;
 808         memblock.reserved.cnt = 1;
 809
 810         memblock.current_limit = MEMBLOCK_ALLOC_ANYWHERE;
 811 }
 812
 813 static int __init early_memblock(char *p)
 814 {
 815         if (p && strstr(p, "debug"))
 816                 memblock_debug = 1;
 817         return 0;
 818 }
 819 early_param("memblock", early_memblock);
 820
 821 #if defined(CONFIG_DEBUG_FS) && !defined(ARCH_DISCARD_MEMBLOCK)
 822
 823 static int memblock_debug_show(struct seq_file *m, void *private)
 824 {
 825         struct memblock_type *type = m->private;
 826         struct memblock_region *reg;
 827         int i;
 828
 829         for (i = 0; i < type->cnt; i++) {
 830                 reg = &type->regions[i];
 831                 seq_printf(m, "%4d: ", i);
 832                 if (sizeof(phys_addr_t) == 4)
 833                         seq_printf(m, "0x%08lx..0x%08lx\n",
 834                                    (unsigned long)reg->base,
 835                                    (unsigned long)(reg->base + reg->size - 1));
 836                 else
 837                         seq_printf(m, "0x%016llx..0x%016llx\n",
 838                                    (unsigned long long)reg->base,
 839                                    (unsigned long long)(reg->base + reg->size - 1));
 840
 841         }
 842         return 0;
 843 }
 844
 845 static int memblock_debug_open(struct inode *inode, struct file *file)
 846 {
 847         return single_open(file, memblock_debug_show, inode->i_private);
 848 }
 849
 850 static const struct file_operations memblock_debug_fops = {
 851         .open = memblock_debug_open,
 852         .read = seq_read,
 853         .llseek = seq_lseek,
 854         .release = single_release,
 855 };
 856
 857 static int __init memblock_init_debugfs(void)
 858 {
 859         struct dentry *root = debugfs_create_dir("memblock", NULL);
 860         if (!root)
 861                 return -ENXIO;
 862         debugfs_create_file("memory", S_IRUGO, root, &memblock.memory, &memblock_debug_fops);
 863         debugfs_create_file("reserved", S_IRUGO, root, &memblock.reserved, &memblock_debug_fops);
 864
 865         return 0;
 866 }
 867 __initcall(memblock_init_debugfs);
 868
 869 #endif /* CONFIG_DEBUG_FS */