mm/bootmem.c

   1 /*
   2  *  bootmem - A boot-time physical memory allocator and configurator
   3  *
   4  *  Copyright (C) 1999 Ingo Molnar
   5  *                1999 Kanoj Sarcar, SGI
   6  *                2008 Johannes Weiner
   7  *
   8  * Access to this subsystem has to be serialized externally (which is true
   9  * for the boot process anyway).
  10  */
  11 #include <linux/init.h>
  12 #include <linux/pfn.h>
  13 #include <linux/bootmem.h>
  14 #include <linux/module.h>
  15 #include <linux/kmemleak.h>
  16 #include <linux/range.h>
  17
  18 #include <asm/bug.h>
  19 #include <asm/io.h>
  20 #include <asm/processor.h>
  21
  22 #include "internal.h"
  23
  24 unsigned long max_low_pfn;
  25 unsigned long min_low_pfn;
  26 unsigned long max_pfn;
  27
  28 #ifdef CONFIG_CRASH_DUMP
  29 /*
  30  * If we have booted due to a crash, max_pfn will be a very low value. We need
  31  * to know the amount of memory that the previous kernel used.
  32  */
  33 unsigned long saved_max_pfn;
  34 #endif
  35
  36 #ifndef CONFIG_NO_BOOTMEM
  37 bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
  38
  39 static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);
  40
  41 static int bootmem_debug;
  42
  43 static int __init bootmem_debug_setup(char *buf)
  44 {
  45         bootmem_debug = 1;
  46         return 0;
  47 }
  48 early_param("bootmem_debug", bootmem_debug_setup);
  49
  50 #define bdebug(fmt, args...) ({                         \
  51         if (unlikely(bootmem_debug))                    \
  52                 printk(KERN_INFO                        \
  53                         "bootmem::%s " fmt,             \
  54                         __func__, ## args);             \
  55 })
  56
  57 static unsigned long __init bootmap_bytes(unsigned long pages)
  58 {
  59         unsigned long bytes = (pages + 7) / 8;
  60
  61         return ALIGN(bytes, sizeof(long));
  62 }
  63
  64 /**
  65  * bootmem_bootmap_pages - calculate bitmap size in pages
  66  * @pages: number of pages the bitmap has to represent
  67  */
  68 unsigned long __init bootmem_bootmap_pages(unsigned long pages)
  69 {
  70         unsigned long bytes = bootmap_bytes(pages);
  71
  72         return PAGE_ALIGN(bytes) >> PAGE_SHIFT;
  73 }
  74
  75 /*
  76  * link bdata in order
  77  */
  78 static void __init link_bootmem(bootmem_data_t *bdata)
  79 {
  80         struct list_head *iter;
  81
  82         list_for_each(iter, &bdata_list) {
  83                 bootmem_data_t *ent;
  84
  85                 ent = list_entry(iter, bootmem_data_t, list);
  86                 if (bdata->node_min_pfn < ent->node_min_pfn)
  87                         break;
  88         }
  89         list_add_tail(&bdata->list, iter);
  90 }
  91
  92 /*
  93  * Called once to set up the allocator itself.
  94  */
  95 static unsigned long __init init_bootmem_core(bootmem_data_t *bdata,
  96         unsigned long mapstart, unsigned long start, unsigned long end)
  97 {
  98         unsigned long mapsize;
  99
 100         mminit_validate_memmodel_limits(&start, &end);
 101         bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
 102         bdata->node_min_pfn = start;
 103         bdata->node_low_pfn = end;
 104         link_bootmem(bdata);
 105
 106         /*
 107          * Initially all pages are reserved - setup_arch() has to
 108          * register free RAM areas explicitly.
 109          */
 110         mapsize = bootmap_bytes(end - start);
 111         memset(bdata->node_bootmem_map, 0xff, mapsize);
 112
 113         bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n",
 114                 bdata - bootmem_node_data, start, mapstart, end, mapsize);
 115
 116         return mapsize;
 117 }
 118
 119 /**
 120  * init_bootmem_node - register a node as boot memory
 121  * @pgdat: node to register
 122  * @freepfn: pfn where the bitmap for this node is to be placed
 123  * @startpfn: first pfn on the node
 124  * @endpfn: first pfn after the node
 125  *
 126  * Returns the number of bytes needed to hold the bitmap for this node.
 127  */
 128 unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,
 129                                 unsigned long startpfn, unsigned long endpfn)
 130 {
 131         return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn);
 132 }
 133
 134 /**
 135  * init_bootmem - register boot memory
 136  * @start: pfn where the bitmap is to be placed
 137  * @pages: number of available physical pages
 138  *
 139  * Returns the number of bytes needed to hold the bitmap.
 140  */
 141 unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
 142 {
 143         max_low_pfn = pages;
 144         min_low_pfn = start;
 145         return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages);
 146 }
 147 #endif
 148 /*
 149  * free_bootmem_late - free bootmem pages directly to page allocator
 150  * @addr: starting address of the range
 151  * @size: size of the range in bytes
 152  *
 153  * This is only useful when the bootmem allocator has already been torn
 154  * down, but we are still initializing the system.  Pages are given directly
 155  * to the page allocator, no bootmem metadata is updated because it is gone.
 156  */
 157 void __init free_bootmem_late(unsigned long addr, unsigned long size)
 158 {
 159         unsigned long cursor, end;
 160
 161         kmemleak_free_part(__va(addr), size);
 162
 163         cursor = PFN_UP(addr);
 164         end = PFN_DOWN(addr + size);
 165
 166         for (; cursor < end; cursor++) {
 167                 __free_pages_bootmem(pfn_to_page(cursor), 0);
 168                 totalram_pages++;
 169         }
 170 }
 171
 172 #ifdef CONFIG_NO_BOOTMEM
 173 static void __init __free_pages_memory(unsigned long start, unsigned long end)
 174 {
 175         int i;
 176         unsigned long start_aligned, end_aligned;
 177         int order = ilog2(BITS_PER_LONG);
 178
 179         start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
 180         end_aligned = end & ~(BITS_PER_LONG - 1);
 181
 182         if (end_aligned <= start_aligned) {
 183 #if 1
 184                 printk(KERN_DEBUG " %lx - %lx\n", start, end);
 185 #endif
 186                 for (i = start; i < end; i++)
 187                         __free_pages_bootmem(pfn_to_page(i), 0);
 188
 189                 return;
 190         }
 191
 192 #if 1
 193         printk(KERN_DEBUG " %lx %lx - %lx %lx\n",
 194                  start, start_aligned, end_aligned, end);
 195 #endif
 196         for (i = start; i < start_aligned; i++)
 197                 __free_pages_bootmem(pfn_to_page(i), 0);
 198
 199         for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
 200                 __free_pages_bootmem(pfn_to_page(i), order);
 201
 202         for (i = end_aligned; i < end; i++)
 203                 __free_pages_bootmem(pfn_to_page(i), 0);
 204 }
 205
 206 unsigned long __init free_all_memory_core_early(int nodeid)
 207 {
 208         int i;
 209         u64 start, end;
 210         unsigned long count = 0;
 211         struct range *range = NULL;
 212         int nr_range;
 213
 214         nr_range = get_free_all_memory_range(&range, nodeid);
 215
 216         for (i = 0; i < nr_range; i++) {
 217                 start = range[i].start;
 218                 end = range[i].end;
 219                 count += end - start;
 220                 __free_pages_memory(start, end);
 221         }
 222
 223         return count;
 224 }
 225 #else
 226 static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
 227 {
 228         int aligned;
 229         struct page *page;
 230         unsigned long start, end, pages, count = 0;
 231
 232         if (!bdata->node_bootmem_map)
 233                 return 0;
 234
 235         start = bdata->node_min_pfn;
 236         end = bdata->node_low_pfn;
 237
 238         /*
 239          * If the start is aligned to the machines wordsize, we might
 240          * be able to free pages in bulks of that order.
 241          */
 242         aligned = !(start & (BITS_PER_LONG - 1));
 243
 244         bdebug("nid=%td start=%lx end=%lx aligned=%d\n",
 245                 bdata - bootmem_node_data, start, end, aligned);
 246
 247         while (start < end) {
 248                 unsigned long *map, idx, vec;
 249
 250                 map = bdata->node_bootmem_map;
 251                 idx = start - bdata->node_min_pfn;
 252                 vec = ~map[idx / BITS_PER_LONG];
 253
 254                 if (aligned && vec == ~0UL && start + BITS_PER_LONG < end) {
 255                         int order = ilog2(BITS_PER_LONG);
 256
 257                         __free_pages_bootmem(pfn_to_page(start), order);
 258                         count += BITS_PER_LONG;
 259                 } else {
 260                         unsigned long off = 0;
 261
 262                         while (vec && off < BITS_PER_LONG) {
 263                                 if (vec & 1) {
 264                                         page = pfn_to_page(start + off);
 265                                         __free_pages_bootmem(page, 0);
 266                                         count++;
 267                                 }
 268                                 vec >>= 1;
 269                                 off++;
 270                         }
 271                 }
 272                 start += BITS_PER_LONG;
 273         }
 274
 275         page = virt_to_page(bdata->node_bootmem_map);
 276         pages = bdata->node_low_pfn - bdata->node_min_pfn;
 277         pages = bootmem_bootmap_pages(pages);
 278         count += pages;
 279         while (pages--)
 280                 __free_pages_bootmem(page++, 0);
 281
 282         bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
 283
 284         return count;
 285 }
 286 #endif
 287
 288 /**
 289  * free_all_bootmem_node - release a node's free pages to the buddy allocator
 290  * @pgdat: node to be released
 291  *
 292  * Returns the number of pages actually released.
 293  */
 294 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
 295 {
 296         register_page_bootmem_info_node(pgdat);
 297 #ifdef CONFIG_NO_BOOTMEM
 298         /* free_all_memory_core_early(MAX_NUMNODES) will be called later */
 299         return 0;
 300 #else
 301         return free_all_bootmem_core(pgdat->bdata);
 302 #endif
 303 }
 304
 305 /**
 306  * free_all_bootmem - release free pages to the buddy allocator
 307  *
 308  * Returns the number of pages actually released.
 309  */
 310 unsigned long __init free_all_bootmem(void)
 311 {
 312 #ifdef CONFIG_NO_BOOTMEM
 313         return free_all_memory_core_early(NODE_DATA(0)->node_id);
 314 #else
 315         return free_all_bootmem_core(NODE_DATA(0)->bdata);
 316 #endif
 317 }
 318
 319 #ifndef CONFIG_NO_BOOTMEM
 320 static void __init __free(bootmem_data_t *bdata,
 321                         unsigned long sidx, unsigned long eidx)
 322 {
 323         unsigned long idx;
 324
 325         bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
 326                 sidx + bdata->node_min_pfn,
 327                 eidx + bdata->node_min_pfn);
 328
 329         if (bdata->hint_idx > sidx)
 330                 bdata->hint_idx = sidx;
 331
 332         for (idx = sidx; idx < eidx; idx++)
 333                 if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
 334                         BUG();
 335 }
 336
 337 static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
 338                         unsigned long eidx, int flags)
 339 {
 340         unsigned long idx;
 341         int exclusive = flags & BOOTMEM_EXCLUSIVE;
 342
 343         bdebug("nid=%td start=%lx end=%lx flags=%x\n",
 344                 bdata - bootmem_node_data,
 345                 sidx + bdata->node_min_pfn,
 346                 eidx + bdata->node_min_pfn,
 347                 flags);
 348
 349         for (idx = sidx; idx < eidx; idx++)
 350                 if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
 351                         if (exclusive) {
 352                                 __free(bdata, sidx, idx);
 353                                 return -EBUSY;
 354                         }
 355                         bdebug("silent double reserve of PFN %lx\n",
 356                                 idx + bdata->node_min_pfn);
 357                 }
 358         return 0;
 359 }
 360
 361 static int __init mark_bootmem_node(bootmem_data_t *bdata,
 362                                 unsigned long start, unsigned long end,
 363                                 int reserve, int flags)
 364 {
 365         unsigned long sidx, eidx;
 366
 367         bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
 368                 bdata - bootmem_node_data, start, end, reserve, flags);
 369
 370         BUG_ON(start < bdata->node_min_pfn);
 371         BUG_ON(end > bdata->node_low_pfn);
 372
 373         sidx = start - bdata->node_min_pfn;
 374         eidx = end - bdata->node_min_pfn;
 375
 376         if (reserve)
 377                 return __reserve(bdata, sidx, eidx, flags);
 378         else
 379                 __free(bdata, sidx, eidx);
 380         return 0;
 381 }
 382
 383 static int __init mark_bootmem(unsigned long start, unsigned long end,
 384                                 int reserve, int flags)
 385 {
 386         unsigned long pos;
 387         bootmem_data_t *bdata;
 388
 389         pos = start;
 390         list_for_each_entry(bdata, &bdata_list, list) {
 391                 int err;
 392                 unsigned long max;
 393
 394                 if (pos < bdata->node_min_pfn ||
 395                     pos >= bdata->node_low_pfn) {
 396                         BUG_ON(pos != start);
 397                         continue;
 398                 }
 399
 400                 max = min(bdata->node_low_pfn, end);
 401
 402                 err = mark_bootmem_node(bdata, pos, max, reserve, flags);
 403                 if (reserve && err) {
 404                         mark_bootmem(start, pos, 0, 0);
 405                         return err;
 406                 }
 407
 408                 if (max == end)
 409                         return 0;
 410                 pos = bdata->node_low_pfn;
 411         }
 412         BUG();
 413 }
 414 #endif
 415
 416 /**
 417  * free_bootmem_node - mark a page range as usable
 418  * @pgdat: node the range resides on
 419  * @physaddr: starting address of the range
 420  * @size: size of the range in bytes
 421  *
 422  * Partial pages will be considered reserved and left as they are.
 423  *
 424  * The range must reside completely on the specified node.
 425  */
 426 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 427                               unsigned long size)
 428 {
 429 #ifdef CONFIG_NO_BOOTMEM
 430         free_early(physaddr, physaddr + size);
 431 #if 0
 432         printk(KERN_DEBUG "free %lx %lx\n", physaddr, size);
 433 #endif
 434 #else
 435         unsigned long start, end;
 436
 437         kmemleak_free_part(__va(physaddr), size);
 438
 439         start = PFN_UP(physaddr);
 440         end = PFN_DOWN(physaddr + size);
 441
 442         mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
 443 #endif
 444 }
 445
 446 /**
 447  * free_bootmem - mark a page range as usable
 448  * @addr: starting address of the range
 449  * @size: size of the range in bytes
 450  *
 451  * Partial pages will be considered reserved and left as they are.
 452  *
 453  * The range must be contiguous but may span node boundaries.
 454  */
 455 void __init free_bootmem(unsigned long addr, unsigned long size)
 456 {
 457 #ifdef CONFIG_NO_BOOTMEM
 458         free_early(addr, addr + size);
 459 #if 0
 460         printk(KERN_DEBUG "free %lx %lx\n", addr, size);
 461 #endif
 462 #else
 463         unsigned long start, end;
 464
 465         kmemleak_free_part(__va(addr), size);
 466
 467         start = PFN_UP(addr);
 468         end = PFN_DOWN(addr + size);
 469
 470         mark_bootmem(start, end, 0, 0);
 471 #endif
 472 }
 473
 474 /**
 475  * reserve_bootmem_node - mark a page range as reserved
 476  * @pgdat: node the range resides on
 477  * @physaddr: starting address of the range
 478  * @size: size of the range in bytes
 479  * @flags: reservation flags (see linux/bootmem.h)
 480  *
 481  * Partial pages will be reserved.
 482  *
 483  * The range must reside completely on the specified node.
 484  */
 485 int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 486                                  unsigned long size, int flags)
 487 {
 488 #ifdef CONFIG_NO_BOOTMEM
 489         panic("no bootmem");
 490         return 0;
 491 #else
 492         unsigned long start, end;
 493
 494         start = PFN_DOWN(physaddr);
 495         end = PFN_UP(physaddr + size);
 496
 497         return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
 498 #endif
 499 }
 500
 501 /**
 502  * reserve_bootmem - mark a page range as usable
 503  * @addr: starting address of the range
 504  * @size: size of the range in bytes
 505  * @flags: reservation flags (see linux/bootmem.h)
 506  *
 507  * Partial pages will be reserved.
 508  *
 509  * The range must be contiguous but may span node boundaries.
 510  */
 511 int __init reserve_bootmem(unsigned long addr, unsigned long size,
 512                             int flags)
 513 {
 514 #ifdef CONFIG_NO_BOOTMEM
 515         panic("no bootmem");
 516         return 0;
 517 #else
 518         unsigned long start, end;
 519
 520         start = PFN_DOWN(addr);
 521         end = PFN_UP(addr + size);
 522
 523         return mark_bootmem(start, end, 1, flags);
 524 #endif
 525 }
 526
 527 #ifndef CONFIG_NO_BOOTMEM
 528 static unsigned long __init align_idx(struct bootmem_data *bdata,
 529                                       unsigned long idx, unsigned long step)
 530 {
 531         unsigned long base = bdata->node_min_pfn;
 532
 533         /*
 534          * Align the index with respect to the node start so that the
 535          * combination of both satisfies the requested alignment.
 536          */
 537
 538         return ALIGN(base + idx, step) - base;
 539 }
 540
 541 static unsigned long __init align_off(struct bootmem_data *bdata,
 542                                       unsigned long off, unsigned long align)
 543 {
 544         unsigned long base = PFN_PHYS(bdata->node_min_pfn);
 545
 546         /* Same as align_idx for byte offsets */
 547
 548         return ALIGN(base + off, align) - base;
 549 }
 550
 551 static void * __init alloc_bootmem_core(struct bootmem_data *bdata,
 552                                         unsigned long size, unsigned long align,
 553                                         unsigned long goal, unsigned long limit)
 554 {
 555         unsigned long fallback = 0;
 556         unsigned long min, max, start, sidx, midx, step;
 557
 558         bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
 559                 bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
 560                 align, goal, limit);
 561
 562         BUG_ON(!size);
 563         BUG_ON(align & (align - 1));
 564         BUG_ON(limit && goal + size > limit);
 565
 566         if (!bdata->node_bootmem_map)
 567                 return NULL;
 568
 569         min = bdata->node_min_pfn;
 570         max = bdata->node_low_pfn;
 571
 572         goal >>= PAGE_SHIFT;
 573         limit >>= PAGE_SHIFT;
 574
 575         if (limit && max > limit)
 576                 max = limit;
 577         if (max <= min)
 578                 return NULL;
 579
 580         step = max(align >> PAGE_SHIFT, 1UL);
 581
 582         if (goal && min < goal && goal < max)
 583                 start = ALIGN(goal, step);
 584         else
 585                 start = ALIGN(min, step);
 586
 587         sidx = start - bdata->node_min_pfn;
 588         midx = max - bdata->node_min_pfn;
 589
 590         if (bdata->hint_idx > sidx) {
 591                 /*
 592                  * Handle the valid case of sidx being zero and still
 593                  * catch the fallback below.
 594                  */
 595                 fallback = sidx + 1;
 596                 sidx = align_idx(bdata, bdata->hint_idx, step);
 597         }
 598
 599         while (1) {
 600                 int merge;
 601                 void *region;
 602                 unsigned long eidx, i, start_off, end_off;
 603 find_block:
 604                 sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
 605                 sidx = align_idx(bdata, sidx, step);
 606                 eidx = sidx + PFN_UP(size);
 607
 608                 if (sidx >= midx || eidx > midx)
 609                         break;
 610
 611                 for (i = sidx; i < eidx; i++)
 612                         if (test_bit(i, bdata->node_bootmem_map)) {
 613                                 sidx = align_idx(bdata, i, step);
 614                                 if (sidx == i)
 615                                         sidx += step;
 616                                 goto find_block;
 617                         }
 618
 619                 if (bdata->last_end_off & (PAGE_SIZE - 1) &&
 620                                 PFN_DOWN(bdata->last_end_off) + 1 == sidx)
 621                         start_off = align_off(bdata, bdata->last_end_off, align);
 622                 else
 623                         start_off = PFN_PHYS(sidx);
 624
 625                 merge = PFN_DOWN(start_off) < sidx;
 626                 end_off = start_off + size;
 627
 628                 bdata->last_end_off = end_off;
 629                 bdata->hint_idx = PFN_UP(end_off);
 630
 631                 /*
 632                  * Reserve the area now:
 633                  */
 634                 if (__reserve(bdata, PFN_DOWN(start_off) + merge,
 635                                 PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
 636                         BUG();
 637
 638                 region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
 639                                 start_off);
 640                 memset(region, 0, size);
 641                 /*
 642                  * The min_count is set to 0 so that bootmem allocated blocks
 643                  * are never reported as leaks.
 644                  */
 645                 kmemleak_alloc(region, size, 0, 0);
 646                 return region;
 647         }
 648
 649         if (fallback) {
 650                 sidx = align_idx(bdata, fallback - 1, step);
 651                 fallback = 0;
 652                 goto find_block;
 653         }
 654
 655         return NULL;
 656 }
 657
 658 static void * __init alloc_arch_preferred_bootmem(bootmem_data_t *bdata,
 659                                         unsigned long size, unsigned long align,
 660                                         unsigned long goal, unsigned long limit)
 661 {
 662         if (WARN_ON_ONCE(slab_is_available()))
 663                 return kzalloc(size, GFP_NOWAIT);
 664
 665 #ifdef CONFIG_HAVE_ARCH_BOOTMEM
 666         {
 667                 bootmem_data_t *p_bdata;
 668
 669                 p_bdata = bootmem_arch_preferred_node(bdata, size, align,
 670                                                         goal, limit);
 671                 if (p_bdata)
 672                         return alloc_bootmem_core(p_bdata, size, align,
 673                                                         goal, limit);
 674         }
 675 #endif
 676         return NULL;
 677 }
 678 #endif
 679
 680 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 681                                         unsigned long align,
 682                                         unsigned long goal,
 683                                         unsigned long limit)
 684 {
 685 #ifdef CONFIG_NO_BOOTMEM
 686         void *ptr;
 687
 688         if (WARN_ON_ONCE(slab_is_available()))
 689                 return kzalloc(size, GFP_NOWAIT);
 690
 691 restart:
 692
 693         ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
 694
 695         if (ptr)
 696                 return ptr;
 697
 698         if (goal != 0) {
 699                 goal = 0;
 700                 goto restart;
 701         }
 702
 703         return NULL;
 704 #else
 705         bootmem_data_t *bdata;
 706         void *region;
 707
 708 restart:
 709         region = alloc_arch_preferred_bootmem(NULL, size, align, goal, limit);
 710         if (region)
 711                 return region;
 712
 713         list_for_each_entry(bdata, &bdata_list, list) {
 714                 if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
 715                         continue;
 716                 if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
 717                         break;
 718
 719                 region = alloc_bootmem_core(bdata, size, align, goal, limit);
 720                 if (region)
 721                         return region;
 722         }
 723
 724         if (goal) {
 725                 goal = 0;
 726                 goto restart;
 727         }
 728
 729         return NULL;
 730 #endif
 731 }
 732
 733 /**
 734  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 735  * @size: size of the request in bytes
 736  * @align: alignment of the region
 737  * @goal: preferred starting address of the region
 738  *
 739  * The goal is dropped if it can not be satisfied and the allocation will
 740  * fall back to memory below @goal.
 741  *
 742  * Allocation may happen on any node in the system.
 743  *
 744  * Returns NULL on failure.
 745  */
 746 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 747                                         unsigned long goal)
 748 {
 749         unsigned long limit = 0;
 750
 751 #ifdef CONFIG_NO_BOOTMEM
 752         limit = -1UL;
 753 #endif
 754
 755         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 756 }
 757
 758 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 759                                         unsigned long goal, unsigned long limit)
 760 {
 761         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 762
 763         if (mem)
 764                 return mem;
 765         /*
 766          * Whoops, we cannot satisfy the allocation request.
 767          */
 768         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 769         panic("Out of memory");
 770         return NULL;
 771 }
 772
 773 /**
 774  * __alloc_bootmem - allocate boot memory
 775  * @size: size of the request in bytes
 776  * @align: alignment of the region
 777  * @goal: preferred starting address of the region
 778  *
 779  * The goal is dropped if it can not be satisfied and the allocation will
 780  * fall back to memory below @goal.
 781  *
 782  * Allocation may happen on any node in the system.
 783  *
 784  * The function panics if the request can not be satisfied.
 785  */
 786 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 787                               unsigned long goal)
 788 {
 789         unsigned long limit = 0;
 790
 791 #ifdef CONFIG_NO_BOOTMEM
 792         limit = -1UL;
 793 #endif
 794
 795         return ___alloc_bootmem(size, align, goal, limit);
 796 }
 797
 798 #ifndef CONFIG_NO_BOOTMEM
 799 static void * __init ___alloc_bootmem_node(bootmem_data_t *bdata,
 800                                 unsigned long size, unsigned long align,
 801                                 unsigned long goal, unsigned long limit)
 802 {
 803         void *ptr;
 804
 805         ptr = alloc_arch_preferred_bootmem(bdata, size, align, goal, limit);
 806         if (ptr)
 807                 return ptr;
 808
 809         ptr = alloc_bootmem_core(bdata, size, align, goal, limit);
 810         if (ptr)
 811                 return ptr;
 812
 813         return ___alloc_bootmem(size, align, goal, limit);
 814 }
 815 #endif
 816
 817 /**
 818  * __alloc_bootmem_node - allocate boot memory from a specific node
 819  * @pgdat: node to allocate from
 820  * @size: size of the request in bytes
 821  * @align: alignment of the region
 822  * @goal: preferred starting address of the region
 823  *
 824  * The goal is dropped if it can not be satisfied and the allocation will
 825  * fall back to memory below @goal.
 826  *
 827  * Allocation may fall back to any node in the system if the specified node
 828  * can not hold the requested memory.
 829  *
 830  * The function panics if the request can not be satisfied.
 831  */
 832 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 833                                    unsigned long align, unsigned long goal)
 834 {
 835         if (WARN_ON_ONCE(slab_is_available()))
 836                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 837
 838 #ifdef CONFIG_NO_BOOTMEM
 839         return __alloc_memory_core_early(pgdat->node_id, size, align,
 840                                          goal, -1ULL);
 841 #else
 842         return ___alloc_bootmem_node(pgdat->bdata, size, align, goal, 0);
 843 #endif
 844 }
 845
 846 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 847                                    unsigned long align, unsigned long goal)
 848 {
 849 #ifdef MAX_DMA32_PFN
 850         unsigned long end_pfn;
 851
 852         if (WARN_ON_ONCE(slab_is_available()))
 853                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 854
 855         /* update goal according ...MAX_DMA32_PFN */
 856         end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages;
 857
 858         if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
 859             (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
 860                 void *ptr;
 861                 unsigned long new_goal;
 862
 863                 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
 864 #ifdef CONFIG_NO_BOOTMEM
 865                 ptr =  __alloc_memory_core_early(pgdat->node_id, size, align,
 866                                                  new_goal, -1ULL);
 867 #else
 868                 ptr = alloc_bootmem_core(pgdat->bdata, size, align,
 869                                                  new_goal, 0);
 870 #endif
 871                 if (ptr)
 872                         return ptr;
 873         }
 874 #endif
 875
 876         return __alloc_bootmem_node(pgdat, size, align, goal);
 877
 878 }
 879
 880 #ifdef CONFIG_SPARSEMEM
 881 /**
 882  * alloc_bootmem_section - allocate boot memory from a specific section
 883  * @size: size of the request in bytes
 884  * @section_nr: sparse map section to allocate from
 885  *
 886  * Return NULL on failure.
 887  */
 888 void * __init alloc_bootmem_section(unsigned long size,
 889                                     unsigned long section_nr)
 890 {
 891 #ifdef CONFIG_NO_BOOTMEM
 892         unsigned long pfn, goal, limit;
 893
 894         pfn = section_nr_to_pfn(section_nr);
 895         goal = pfn << PAGE_SHIFT;
 896         limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
 897
 898         return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
 899                                          SMP_CACHE_BYTES, goal, limit);
 900 #else
 901         bootmem_data_t *bdata;
 902         unsigned long pfn, goal, limit;
 903
 904         pfn = section_nr_to_pfn(section_nr);
 905         goal = pfn << PAGE_SHIFT;
 906         limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
 907         bdata = &bootmem_node_data[early_pfn_to_nid(pfn)];
 908
 909         return alloc_bootmem_core(bdata, size, SMP_CACHE_BYTES, goal, limit);
 910 #endif
 911 }
 912 #endif
 913
 914 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 915                                    unsigned long align, unsigned long goal)
 916 {
 917         void *ptr;
 918
 919         if (WARN_ON_ONCE(slab_is_available()))
 920                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 921
 922 #ifdef CONFIG_NO_BOOTMEM
 923         ptr =  __alloc_memory_core_early(pgdat->node_id, size, align,
 924                                                  goal, -1ULL);
 925 #else
 926         ptr = alloc_arch_preferred_bootmem(pgdat->bdata, size, align, goal, 0);
 927         if (ptr)
 928                 return ptr;
 929
 930         ptr = alloc_bootmem_core(pgdat->bdata, size, align, goal, 0);
 931 #endif
 932         if (ptr)
 933                 return ptr;
 934
 935         return __alloc_bootmem_nopanic(size, align, goal);
 936 }
 937
 938 #ifndef ARCH_LOW_ADDRESS_LIMIT
 939 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 940 #endif
 941
 942 /**
 943  * __alloc_bootmem_low - allocate low boot memory
 944  * @size: size of the request in bytes
 945  * @align: alignment of the region
 946  * @goal: preferred starting address of the region
 947  *
 948  * The goal is dropped if it can not be satisfied and the allocation will
 949  * fall back to memory below @goal.
 950  *
 951  * Allocation may happen on any node in the system.
 952  *
 953  * The function panics if the request can not be satisfied.
 954  */
 955 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 956                                   unsigned long goal)
 957 {
 958         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 959 }
 960
 961 /**
 962  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 963  * @pgdat: node to allocate from
 964  * @size: size of the request in bytes
 965  * @align: alignment of the region
 966  * @goal: preferred starting address of the region
 967  *
 968  * The goal is dropped if it can not be satisfied and the allocation will
 969  * fall back to memory below @goal.
 970  *
 971  * Allocation may fall back to any node in the system if the specified node
 972  * can not hold the requested memory.
 973  *
 974  * The function panics if the request can not be satisfied.
 975  */
 976 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 977                                        unsigned long align, unsigned long goal)
 978 {
 979         if (WARN_ON_ONCE(slab_is_available()))
 980                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 981
 982 #ifdef CONFIG_NO_BOOTMEM
 983         return __alloc_memory_core_early(pgdat->node_id, size, align,
 984                                 goal, ARCH_LOW_ADDRESS_LIMIT);
 985 #else
 986         return ___alloc_bootmem_node(pgdat->bdata, size, align,
 987                                 goal, ARCH_LOW_ADDRESS_LIMIT);
 988 #endif
 989 }