net: ipv6 bind to device issue
[linux-2.6-block.git] / mm / bootmem.c
CommitLineData
1da177e4 1/*
57cfc29e 2 * bootmem - A boot-time physical memory allocator and configurator
1da177e4
LT
3 *
4 * Copyright (C) 1999 Ingo Molnar
57cfc29e
JW
5 * 1999 Kanoj Sarcar, SGI
6 * 2008 Johannes Weiner
1da177e4 7 *
57cfc29e
JW
8 * Access to this subsystem has to be serialized externally (which is true
9 * for the boot process anyway).
1da177e4 10 */
1da177e4 11#include <linux/init.h>
bbc7b92e 12#include <linux/pfn.h>
5a0e3ad6 13#include <linux/slab.h>
1da177e4 14#include <linux/bootmem.h>
1da177e4 15#include <linux/module.h>
ec3a354b 16#include <linux/kmemleak.h>
08677214 17#include <linux/range.h>
e786e86a
FBH
18
19#include <asm/bug.h>
1da177e4 20#include <asm/io.h>
dfd54cbc 21#include <asm/processor.h>
e786e86a 22
1da177e4
LT
23#include "internal.h"
24
1da177e4
LT
25unsigned long max_low_pfn;
26unsigned long min_low_pfn;
27unsigned long max_pfn;
28
92aa63a5
VG
29#ifdef CONFIG_CRASH_DUMP
30/*
31 * If we have booted due to a crash, max_pfn will be a very low value. We need
32 * to know the amount of memory that the previous kernel used.
33 */
34unsigned long saved_max_pfn;
35#endif
36
08677214 37#ifndef CONFIG_NO_BOOTMEM
b61bfa3c
JW
38bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
39
636cc40c
JW
40static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);
41
2e5237da
JW
42static int bootmem_debug;
43
44static int __init bootmem_debug_setup(char *buf)
45{
46 bootmem_debug = 1;
47 return 0;
48}
49early_param("bootmem_debug", bootmem_debug_setup);
50
51#define bdebug(fmt, args...) ({ \
52 if (unlikely(bootmem_debug)) \
53 printk(KERN_INFO \
54 "bootmem::%s " fmt, \
80a914dc 55 __func__, ## args); \
2e5237da
JW
56})
57
df049a5f 58static unsigned long __init bootmap_bytes(unsigned long pages)
223e8dc9 59{
df049a5f 60 unsigned long bytes = (pages + 7) / 8;
223e8dc9 61
df049a5f 62 return ALIGN(bytes, sizeof(long));
223e8dc9
JW
63}
64
a66fd7da
JW
65/**
66 * bootmem_bootmap_pages - calculate bitmap size in pages
67 * @pages: number of pages the bitmap has to represent
68 */
f71bf0ca 69unsigned long __init bootmem_bootmap_pages(unsigned long pages)
1da177e4 70{
df049a5f 71 unsigned long bytes = bootmap_bytes(pages);
1da177e4 72
df049a5f 73 return PAGE_ALIGN(bytes) >> PAGE_SHIFT;
1da177e4 74}
f71bf0ca 75
679bc9fb
KH
76/*
77 * link bdata in order
78 */
69d49e68 79static void __init link_bootmem(bootmem_data_t *bdata)
679bc9fb 80{
636cc40c 81 struct list_head *iter;
f71bf0ca 82
636cc40c
JW
83 list_for_each(iter, &bdata_list) {
84 bootmem_data_t *ent;
85
86 ent = list_entry(iter, bootmem_data_t, list);
3560e249 87 if (bdata->node_min_pfn < ent->node_min_pfn)
636cc40c 88 break;
679bc9fb 89 }
636cc40c 90 list_add_tail(&bdata->list, iter);
679bc9fb
KH
91}
92
1da177e4
LT
93/*
94 * Called once to set up the allocator itself.
95 */
8ae04463 96static unsigned long __init init_bootmem_core(bootmem_data_t *bdata,
1da177e4
LT
97 unsigned long mapstart, unsigned long start, unsigned long end)
98{
bbc7b92e 99 unsigned long mapsize;
1da177e4 100
2dbb51c4 101 mminit_validate_memmodel_limits(&start, &end);
bbc7b92e 102 bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
3560e249 103 bdata->node_min_pfn = start;
1da177e4 104 bdata->node_low_pfn = end;
679bc9fb 105 link_bootmem(bdata);
1da177e4
LT
106
107 /*
108 * Initially all pages are reserved - setup_arch() has to
109 * register free RAM areas explicitly.
110 */
df049a5f 111 mapsize = bootmap_bytes(end - start);
1da177e4
LT
112 memset(bdata->node_bootmem_map, 0xff, mapsize);
113
2e5237da
JW
114 bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n",
115 bdata - bootmem_node_data, start, mapstart, end, mapsize);
116
1da177e4
LT
117 return mapsize;
118}
119
a66fd7da
JW
120/**
121 * init_bootmem_node - register a node as boot memory
122 * @pgdat: node to register
123 * @freepfn: pfn where the bitmap for this node is to be placed
124 * @startpfn: first pfn on the node
125 * @endpfn: first pfn after the node
126 *
127 * Returns the number of bytes needed to hold the bitmap for this node.
128 */
223e8dc9
JW
129unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,
130 unsigned long startpfn, unsigned long endpfn)
131{
132 return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn);
133}
134
a66fd7da
JW
135/**
136 * init_bootmem - register boot memory
137 * @start: pfn where the bitmap is to be placed
138 * @pages: number of available physical pages
139 *
140 * Returns the number of bytes needed to hold the bitmap.
141 */
223e8dc9
JW
142unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
143{
144 max_low_pfn = pages;
145 min_low_pfn = start;
146 return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages);
147}
08677214 148#endif
9f993ac3
FT
149/*
150 * free_bootmem_late - free bootmem pages directly to page allocator
151 * @addr: starting address of the range
152 * @size: size of the range in bytes
153 *
154 * This is only useful when the bootmem allocator has already been torn
155 * down, but we are still initializing the system. Pages are given directly
156 * to the page allocator, no bootmem metadata is updated because it is gone.
157 */
158void __init free_bootmem_late(unsigned long addr, unsigned long size)
159{
160 unsigned long cursor, end;
161
162 kmemleak_free_part(__va(addr), size);
163
164 cursor = PFN_UP(addr);
165 end = PFN_DOWN(addr + size);
166
167 for (; cursor < end; cursor++) {
168 __free_pages_bootmem(pfn_to_page(cursor), 0);
169 totalram_pages++;
170 }
171}
172
08677214
YL
173#ifdef CONFIG_NO_BOOTMEM
174static void __init __free_pages_memory(unsigned long start, unsigned long end)
175{
176 int i;
177 unsigned long start_aligned, end_aligned;
178 int order = ilog2(BITS_PER_LONG);
179
180 start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);
181 end_aligned = end & ~(BITS_PER_LONG - 1);
182
183 if (end_aligned <= start_aligned) {
08677214
YL
184 for (i = start; i < end; i++)
185 __free_pages_bootmem(pfn_to_page(i), 0);
186
187 return;
188 }
189
08677214
YL
190 for (i = start; i < start_aligned; i++)
191 __free_pages_bootmem(pfn_to_page(i), 0);
192
193 for (i = start_aligned; i < end_aligned; i += BITS_PER_LONG)
194 __free_pages_bootmem(pfn_to_page(i), order);
195
196 for (i = end_aligned; i < end; i++)
197 __free_pages_bootmem(pfn_to_page(i), 0);
198}
199
200unsigned long __init free_all_memory_core_early(int nodeid)
201{
202 int i;
203 u64 start, end;
204 unsigned long count = 0;
205 struct range *range = NULL;
206 int nr_range;
207
208 nr_range = get_free_all_memory_range(&range, nodeid);
209
210 for (i = 0; i < nr_range; i++) {
211 start = range[i].start;
212 end = range[i].end;
213 count += end - start;
214 __free_pages_memory(start, end);
215 }
216
217 return count;
218}
219#else
223e8dc9
JW
220static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
221{
41546c17 222 int aligned;
223e8dc9 223 struct page *page;
41546c17
JW
224 unsigned long start, end, pages, count = 0;
225
226 if (!bdata->node_bootmem_map)
227 return 0;
228
3560e249 229 start = bdata->node_min_pfn;
41546c17
JW
230 end = bdata->node_low_pfn;
231
223e8dc9 232 /*
41546c17
JW
233 * If the start is aligned to the machines wordsize, we might
234 * be able to free pages in bulks of that order.
223e8dc9 235 */
41546c17 236 aligned = !(start & (BITS_PER_LONG - 1));
223e8dc9 237
41546c17
JW
238 bdebug("nid=%td start=%lx end=%lx aligned=%d\n",
239 bdata - bootmem_node_data, start, end, aligned);
223e8dc9 240
41546c17
JW
241 while (start < end) {
242 unsigned long *map, idx, vec;
223e8dc9 243
41546c17 244 map = bdata->node_bootmem_map;
3560e249 245 idx = start - bdata->node_min_pfn;
41546c17
JW
246 vec = ~map[idx / BITS_PER_LONG];
247
248 if (aligned && vec == ~0UL && start + BITS_PER_LONG < end) {
249 int order = ilog2(BITS_PER_LONG);
250
251 __free_pages_bootmem(pfn_to_page(start), order);
223e8dc9 252 count += BITS_PER_LONG;
41546c17
JW
253 } else {
254 unsigned long off = 0;
255
256 while (vec && off < BITS_PER_LONG) {
257 if (vec & 1) {
258 page = pfn_to_page(start + off);
223e8dc9 259 __free_pages_bootmem(page, 0);
41546c17 260 count++;
223e8dc9 261 }
41546c17
JW
262 vec >>= 1;
263 off++;
223e8dc9 264 }
223e8dc9 265 }
41546c17 266 start += BITS_PER_LONG;
223e8dc9
JW
267 }
268
223e8dc9 269 page = virt_to_page(bdata->node_bootmem_map);
3560e249 270 pages = bdata->node_low_pfn - bdata->node_min_pfn;
41546c17
JW
271 pages = bootmem_bootmap_pages(pages);
272 count += pages;
273 while (pages--)
274 __free_pages_bootmem(page++, 0);
223e8dc9 275
2e5237da
JW
276 bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
277
223e8dc9
JW
278 return count;
279}
08677214 280#endif
223e8dc9 281
a66fd7da
JW
282/**
283 * free_all_bootmem_node - release a node's free pages to the buddy allocator
284 * @pgdat: node to be released
285 *
286 * Returns the number of pages actually released.
287 */
223e8dc9
JW
288unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
289{
290 register_page_bootmem_info_node(pgdat);
08677214
YL
291#ifdef CONFIG_NO_BOOTMEM
292 /* free_all_memory_core_early(MAX_NUMNODES) will be called later */
293 return 0;
294#else
223e8dc9 295 return free_all_bootmem_core(pgdat->bdata);
08677214 296#endif
223e8dc9
JW
297}
298
a66fd7da
JW
299/**
300 * free_all_bootmem - release free pages to the buddy allocator
301 *
302 * Returns the number of pages actually released.
303 */
223e8dc9
JW
304unsigned long __init free_all_bootmem(void)
305{
08677214 306#ifdef CONFIG_NO_BOOTMEM
33799858
YL
307 /*
308 * We need to use MAX_NUMNODES instead of NODE_DATA(0)->node_id
309 * because in some case like Node0 doesnt have RAM installed
310 * low ram will be on Node1
311 * Use MAX_NUMNODES will make sure all ranges in early_node_map[]
312 * will be used instead of only Node0 related
313 */
314 return free_all_memory_core_early(MAX_NUMNODES);
08677214 315#else
aa235fc7
YL
316 unsigned long total_pages = 0;
317 bootmem_data_t *bdata;
318
319 list_for_each_entry(bdata, &bdata_list, list)
320 total_pages += free_all_bootmem_core(bdata);
321
322 return total_pages;
08677214 323#endif
223e8dc9
JW
324}
325
08677214 326#ifndef CONFIG_NO_BOOTMEM
d747fa4b
JW
327static void __init __free(bootmem_data_t *bdata,
328 unsigned long sidx, unsigned long eidx)
329{
330 unsigned long idx;
331
332 bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
3560e249
JW
333 sidx + bdata->node_min_pfn,
334 eidx + bdata->node_min_pfn);
d747fa4b 335
e2bf3cae
JW
336 if (bdata->hint_idx > sidx)
337 bdata->hint_idx = sidx;
338
d747fa4b
JW
339 for (idx = sidx; idx < eidx; idx++)
340 if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
341 BUG();
342}
343
344static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
345 unsigned long eidx, int flags)
346{
347 unsigned long idx;
348 int exclusive = flags & BOOTMEM_EXCLUSIVE;
349
350 bdebug("nid=%td start=%lx end=%lx flags=%x\n",
351 bdata - bootmem_node_data,
3560e249
JW
352 sidx + bdata->node_min_pfn,
353 eidx + bdata->node_min_pfn,
d747fa4b
JW
354 flags);
355
356 for (idx = sidx; idx < eidx; idx++)
357 if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
358 if (exclusive) {
359 __free(bdata, sidx, idx);
360 return -EBUSY;
361 }
362 bdebug("silent double reserve of PFN %lx\n",
3560e249 363 idx + bdata->node_min_pfn);
d747fa4b
JW
364 }
365 return 0;
366}
367
e2bf3cae
JW
368static int __init mark_bootmem_node(bootmem_data_t *bdata,
369 unsigned long start, unsigned long end,
370 int reserve, int flags)
223e8dc9
JW
371{
372 unsigned long sidx, eidx;
223e8dc9 373
e2bf3cae
JW
374 bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
375 bdata - bootmem_node_data, start, end, reserve, flags);
223e8dc9 376
3560e249 377 BUG_ON(start < bdata->node_min_pfn);
e2bf3cae 378 BUG_ON(end > bdata->node_low_pfn);
223e8dc9 379
3560e249
JW
380 sidx = start - bdata->node_min_pfn;
381 eidx = end - bdata->node_min_pfn;
223e8dc9 382
e2bf3cae
JW
383 if (reserve)
384 return __reserve(bdata, sidx, eidx, flags);
223e8dc9 385 else
e2bf3cae
JW
386 __free(bdata, sidx, eidx);
387 return 0;
388}
389
390static int __init mark_bootmem(unsigned long start, unsigned long end,
391 int reserve, int flags)
392{
393 unsigned long pos;
394 bootmem_data_t *bdata;
395
396 pos = start;
397 list_for_each_entry(bdata, &bdata_list, list) {
398 int err;
399 unsigned long max;
400
3560e249
JW
401 if (pos < bdata->node_min_pfn ||
402 pos >= bdata->node_low_pfn) {
e2bf3cae
JW
403 BUG_ON(pos != start);
404 continue;
405 }
406
407 max = min(bdata->node_low_pfn, end);
223e8dc9 408
e2bf3cae
JW
409 err = mark_bootmem_node(bdata, pos, max, reserve, flags);
410 if (reserve && err) {
411 mark_bootmem(start, pos, 0, 0);
412 return err;
413 }
223e8dc9 414
e2bf3cae
JW
415 if (max == end)
416 return 0;
417 pos = bdata->node_low_pfn;
418 }
419 BUG();
223e8dc9 420}
08677214 421#endif
223e8dc9 422
a66fd7da
JW
423/**
424 * free_bootmem_node - mark a page range as usable
425 * @pgdat: node the range resides on
426 * @physaddr: starting address of the range
427 * @size: size of the range in bytes
428 *
429 * Partial pages will be considered reserved and left as they are.
430 *
e2bf3cae 431 * The range must reside completely on the specified node.
a66fd7da 432 */
223e8dc9
JW
433void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
434 unsigned long size)
435{
08677214
YL
436#ifdef CONFIG_NO_BOOTMEM
437 free_early(physaddr, physaddr + size);
08677214 438#else
e2bf3cae
JW
439 unsigned long start, end;
440
ec3a354b
CM
441 kmemleak_free_part(__va(physaddr), size);
442
e2bf3cae
JW
443 start = PFN_UP(physaddr);
444 end = PFN_DOWN(physaddr + size);
445
446 mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
08677214 447#endif
223e8dc9
JW
448}
449
a66fd7da
JW
450/**
451 * free_bootmem - mark a page range as usable
452 * @addr: starting address of the range
453 * @size: size of the range in bytes
454 *
455 * Partial pages will be considered reserved and left as they are.
456 *
e2bf3cae 457 * The range must be contiguous but may span node boundaries.
a66fd7da 458 */
223e8dc9
JW
459void __init free_bootmem(unsigned long addr, unsigned long size)
460{
08677214
YL
461#ifdef CONFIG_NO_BOOTMEM
462 free_early(addr, addr + size);
08677214 463#else
e2bf3cae 464 unsigned long start, end;
a5645a61 465
ec3a354b
CM
466 kmemleak_free_part(__va(addr), size);
467
e2bf3cae
JW
468 start = PFN_UP(addr);
469 end = PFN_DOWN(addr + size);
1da177e4 470
e2bf3cae 471 mark_bootmem(start, end, 0, 0);
08677214 472#endif
1da177e4
LT
473}
474
a66fd7da
JW
475/**
476 * reserve_bootmem_node - mark a page range as reserved
477 * @pgdat: node the range resides on
478 * @physaddr: starting address of the range
479 * @size: size of the range in bytes
480 * @flags: reservation flags (see linux/bootmem.h)
481 *
482 * Partial pages will be reserved.
483 *
e2bf3cae 484 * The range must reside completely on the specified node.
a66fd7da 485 */
223e8dc9
JW
486int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
487 unsigned long size, int flags)
1da177e4 488{
08677214
YL
489#ifdef CONFIG_NO_BOOTMEM
490 panic("no bootmem");
491 return 0;
492#else
e2bf3cae 493 unsigned long start, end;
1da177e4 494
e2bf3cae
JW
495 start = PFN_DOWN(physaddr);
496 end = PFN_UP(physaddr + size);
497
498 return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
08677214 499#endif
223e8dc9 500}
5a982cbc 501
a66fd7da
JW
502/**
503 * reserve_bootmem - mark a page range as usable
504 * @addr: starting address of the range
505 * @size: size of the range in bytes
506 * @flags: reservation flags (see linux/bootmem.h)
507 *
508 * Partial pages will be reserved.
509 *
e2bf3cae 510 * The range must be contiguous but may span node boundaries.
a66fd7da 511 */
223e8dc9
JW
512int __init reserve_bootmem(unsigned long addr, unsigned long size,
513 int flags)
514{
08677214
YL
515#ifdef CONFIG_NO_BOOTMEM
516 panic("no bootmem");
517 return 0;
518#else
e2bf3cae 519 unsigned long start, end;
1da177e4 520
e2bf3cae
JW
521 start = PFN_DOWN(addr);
522 end = PFN_UP(addr + size);
223e8dc9 523
e2bf3cae 524 return mark_bootmem(start, end, 1, flags);
08677214 525#endif
1da177e4
LT
526}
527
08677214 528#ifndef CONFIG_NO_BOOTMEM
8aa043d7
JB
529static unsigned long __init align_idx(struct bootmem_data *bdata,
530 unsigned long idx, unsigned long step)
481ebd0d
JW
531{
532 unsigned long base = bdata->node_min_pfn;
533
534 /*
535 * Align the index with respect to the node start so that the
536 * combination of both satisfies the requested alignment.
537 */
538
539 return ALIGN(base + idx, step) - base;
540}
541
8aa043d7
JB
542static unsigned long __init align_off(struct bootmem_data *bdata,
543 unsigned long off, unsigned long align)
481ebd0d
JW
544{
545 unsigned long base = PFN_PHYS(bdata->node_min_pfn);
546
547 /* Same as align_idx for byte offsets */
548
549 return ALIGN(base + off, align) - base;
550}
551
d0c4f570
TH
552static void * __init alloc_bootmem_core(struct bootmem_data *bdata,
553 unsigned long size, unsigned long align,
554 unsigned long goal, unsigned long limit)
1da177e4 555{
0f3caba2 556 unsigned long fallback = 0;
5f2809e6
JW
557 unsigned long min, max, start, sidx, midx, step;
558
594fe1a0
JW
559 bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
560 bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
561 align, goal, limit);
562
5f2809e6
JW
563 BUG_ON(!size);
564 BUG_ON(align & (align - 1));
565 BUG_ON(limit && goal + size > limit);
1da177e4 566
7c309a64
CK
567 if (!bdata->node_bootmem_map)
568 return NULL;
569
3560e249 570 min = bdata->node_min_pfn;
5f2809e6 571 max = bdata->node_low_pfn;
9a2dc04c 572
5f2809e6
JW
573 goal >>= PAGE_SHIFT;
574 limit >>= PAGE_SHIFT;
575
576 if (limit && max > limit)
577 max = limit;
578 if (max <= min)
9a2dc04c
YL
579 return NULL;
580
5f2809e6 581 step = max(align >> PAGE_SHIFT, 1UL);
281dd25c 582
5f2809e6
JW
583 if (goal && min < goal && goal < max)
584 start = ALIGN(goal, step);
585 else
586 start = ALIGN(min, step);
1da177e4 587
481ebd0d 588 sidx = start - bdata->node_min_pfn;
3560e249 589 midx = max - bdata->node_min_pfn;
1da177e4 590
5f2809e6 591 if (bdata->hint_idx > sidx) {
0f3caba2
JW
592 /*
593 * Handle the valid case of sidx being zero and still
594 * catch the fallback below.
595 */
596 fallback = sidx + 1;
481ebd0d 597 sidx = align_idx(bdata, bdata->hint_idx, step);
5f2809e6 598 }
1da177e4 599
5f2809e6
JW
600 while (1) {
601 int merge;
602 void *region;
603 unsigned long eidx, i, start_off, end_off;
604find_block:
605 sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
481ebd0d 606 sidx = align_idx(bdata, sidx, step);
5f2809e6 607 eidx = sidx + PFN_UP(size);
ad09315c 608
5f2809e6 609 if (sidx >= midx || eidx > midx)
66d43e98 610 break;
1da177e4 611
5f2809e6
JW
612 for (i = sidx; i < eidx; i++)
613 if (test_bit(i, bdata->node_bootmem_map)) {
481ebd0d 614 sidx = align_idx(bdata, i, step);
5f2809e6
JW
615 if (sidx == i)
616 sidx += step;
617 goto find_block;
618 }
1da177e4 619
627240aa 620 if (bdata->last_end_off & (PAGE_SIZE - 1) &&
5f2809e6 621 PFN_DOWN(bdata->last_end_off) + 1 == sidx)
481ebd0d 622 start_off = align_off(bdata, bdata->last_end_off, align);
5f2809e6
JW
623 else
624 start_off = PFN_PHYS(sidx);
625
626 merge = PFN_DOWN(start_off) < sidx;
627 end_off = start_off + size;
628
629 bdata->last_end_off = end_off;
630 bdata->hint_idx = PFN_UP(end_off);
631
632 /*
633 * Reserve the area now:
634 */
d747fa4b
JW
635 if (__reserve(bdata, PFN_DOWN(start_off) + merge,
636 PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
637 BUG();
5f2809e6 638
3560e249
JW
639 region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
640 start_off);
5f2809e6 641 memset(region, 0, size);
008139d9
CM
642 /*
643 * The min_count is set to 0 so that bootmem allocated blocks
644 * are never reported as leaks.
645 */
646 kmemleak_alloc(region, size, 0, 0);
5f2809e6 647 return region;
1da177e4
LT
648 }
649
0f3caba2 650 if (fallback) {
481ebd0d 651 sidx = align_idx(bdata, fallback - 1, step);
0f3caba2
JW
652 fallback = 0;
653 goto find_block;
654 }
655
656 return NULL;
657}
658
d0c4f570
TH
659static void * __init alloc_arch_preferred_bootmem(bootmem_data_t *bdata,
660 unsigned long size, unsigned long align,
661 unsigned long goal, unsigned long limit)
662{
441c7e0a
PE
663 if (WARN_ON_ONCE(slab_is_available()))
664 return kzalloc(size, GFP_NOWAIT);
665
d0c4f570 666#ifdef CONFIG_HAVE_ARCH_BOOTMEM
433f13a7
JP
667 {
668 bootmem_data_t *p_bdata;
669
670 p_bdata = bootmem_arch_preferred_node(bdata, size, align,
671 goal, limit);
672 if (p_bdata)
673 return alloc_bootmem_core(p_bdata, size, align,
674 goal, limit);
675 }
d0c4f570
TH
676#endif
677 return NULL;
678}
08677214 679#endif
d0c4f570 680
0f3caba2
JW
681static void * __init ___alloc_bootmem_nopanic(unsigned long size,
682 unsigned long align,
683 unsigned long goal,
684 unsigned long limit)
685{
08677214
YL
686#ifdef CONFIG_NO_BOOTMEM
687 void *ptr;
688
689 if (WARN_ON_ONCE(slab_is_available()))
690 return kzalloc(size, GFP_NOWAIT);
691
692restart:
693
694 ptr = __alloc_memory_core_early(MAX_NUMNODES, size, align, goal, limit);
695
696 if (ptr)
697 return ptr;
698
699 if (goal != 0) {
700 goal = 0;
701 goto restart;
702 }
703
704 return NULL;
705#else
0f3caba2 706 bootmem_data_t *bdata;
d0c4f570 707 void *region;
0f3caba2
JW
708
709restart:
d0c4f570
TH
710 region = alloc_arch_preferred_bootmem(NULL, size, align, goal, limit);
711 if (region)
712 return region;
0f3caba2 713
d0c4f570 714 list_for_each_entry(bdata, &bdata_list, list) {
0f3caba2
JW
715 if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
716 continue;
3560e249 717 if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
0f3caba2
JW
718 break;
719
720 region = alloc_bootmem_core(bdata, size, align, goal, limit);
721 if (region)
722 return region;
723 }
724
5f2809e6
JW
725 if (goal) {
726 goal = 0;
0f3caba2 727 goto restart;
5f2809e6 728 }
2e5237da 729
5f2809e6 730 return NULL;
08677214 731#endif
1da177e4
LT
732}
733
a66fd7da
JW
734/**
735 * __alloc_bootmem_nopanic - allocate boot memory without panicking
736 * @size: size of the request in bytes
737 * @align: alignment of the region
738 * @goal: preferred starting address of the region
739 *
740 * The goal is dropped if it can not be satisfied and the allocation will
741 * fall back to memory below @goal.
742 *
743 * Allocation may happen on any node in the system.
744 *
745 * Returns NULL on failure.
746 */
bb0923a6 747void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
0f3caba2 748 unsigned long goal)
1da177e4 749{
08677214
YL
750 unsigned long limit = 0;
751
752#ifdef CONFIG_NO_BOOTMEM
753 limit = -1UL;
754#endif
755
756 return ___alloc_bootmem_nopanic(size, align, goal, limit);
0f3caba2 757}
1da177e4 758
0f3caba2
JW
759static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
760 unsigned long goal, unsigned long limit)
761{
762 void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
763
764 if (mem)
765 return mem;
766 /*
767 * Whoops, we cannot satisfy the allocation request.
768 */
769 printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
770 panic("Out of memory");
a8062231
AK
771 return NULL;
772}
1da177e4 773
a66fd7da
JW
774/**
775 * __alloc_bootmem - allocate boot memory
776 * @size: size of the request in bytes
777 * @align: alignment of the region
778 * @goal: preferred starting address of the region
779 *
780 * The goal is dropped if it can not be satisfied and the allocation will
781 * fall back to memory below @goal.
782 *
783 * Allocation may happen on any node in the system.
784 *
785 * The function panics if the request can not be satisfied.
786 */
bb0923a6
FBH
787void * __init __alloc_bootmem(unsigned long size, unsigned long align,
788 unsigned long goal)
a8062231 789{
08677214
YL
790 unsigned long limit = 0;
791
792#ifdef CONFIG_NO_BOOTMEM
793 limit = -1UL;
794#endif
795
796 return ___alloc_bootmem(size, align, goal, limit);
1da177e4
LT
797}
798
08677214 799#ifndef CONFIG_NO_BOOTMEM
4cc278b7
JW
800static void * __init ___alloc_bootmem_node(bootmem_data_t *bdata,
801 unsigned long size, unsigned long align,
802 unsigned long goal, unsigned long limit)
803{
804 void *ptr;
805
d0c4f570
TH
806 ptr = alloc_arch_preferred_bootmem(bdata, size, align, goal, limit);
807 if (ptr)
808 return ptr;
809
4cc278b7
JW
810 ptr = alloc_bootmem_core(bdata, size, align, goal, limit);
811 if (ptr)
812 return ptr;
813
814 return ___alloc_bootmem(size, align, goal, limit);
815}
08677214 816#endif
4cc278b7 817
a66fd7da
JW
818/**
819 * __alloc_bootmem_node - allocate boot memory from a specific node
820 * @pgdat: node to allocate from
821 * @size: size of the request in bytes
822 * @align: alignment of the region
823 * @goal: preferred starting address of the region
824 *
825 * The goal is dropped if it can not be satisfied and the allocation will
826 * fall back to memory below @goal.
827 *
828 * Allocation may fall back to any node in the system if the specified node
829 * can not hold the requested memory.
830 *
831 * The function panics if the request can not be satisfied.
832 */
bb0923a6
FBH
833void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
834 unsigned long align, unsigned long goal)
1da177e4 835{
c91c4773
PE
836 if (WARN_ON_ONCE(slab_is_available()))
837 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
838
08677214
YL
839#ifdef CONFIG_NO_BOOTMEM
840 return __alloc_memory_core_early(pgdat->node_id, size, align,
841 goal, -1ULL);
842#else
4cc278b7 843 return ___alloc_bootmem_node(pgdat->bdata, size, align, goal, 0);
08677214
YL
844#endif
845}
846
847void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
848 unsigned long align, unsigned long goal)
849{
850#ifdef MAX_DMA32_PFN
851 unsigned long end_pfn;
852
853 if (WARN_ON_ONCE(slab_is_available()))
854 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
855
856 /* update goal according ...MAX_DMA32_PFN */
857 end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages;
858
859 if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
860 (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
861 void *ptr;
862 unsigned long new_goal;
863
864 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
865#ifdef CONFIG_NO_BOOTMEM
866 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
867 new_goal, -1ULL);
868#else
869 ptr = alloc_bootmem_core(pgdat->bdata, size, align,
870 new_goal, 0);
871#endif
872 if (ptr)
873 return ptr;
874 }
875#endif
876
877 return __alloc_bootmem_node(pgdat, size, align, goal);
878
1da177e4
LT
879}
880
e70260aa 881#ifdef CONFIG_SPARSEMEM
a66fd7da
JW
882/**
883 * alloc_bootmem_section - allocate boot memory from a specific section
884 * @size: size of the request in bytes
885 * @section_nr: sparse map section to allocate from
886 *
887 * Return NULL on failure.
888 */
e70260aa
YG
889void * __init alloc_bootmem_section(unsigned long size,
890 unsigned long section_nr)
891{
08677214
YL
892#ifdef CONFIG_NO_BOOTMEM
893 unsigned long pfn, goal, limit;
894
895 pfn = section_nr_to_pfn(section_nr);
896 goal = pfn << PAGE_SHIFT;
897 limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
898
899 return __alloc_memory_core_early(early_pfn_to_nid(pfn), size,
900 SMP_CACHE_BYTES, goal, limit);
901#else
75a56cfe
JW
902 bootmem_data_t *bdata;
903 unsigned long pfn, goal, limit;
e70260aa
YG
904
905 pfn = section_nr_to_pfn(section_nr);
75a56cfe
JW
906 goal = pfn << PAGE_SHIFT;
907 limit = section_nr_to_pfn(section_nr + 1) << PAGE_SHIFT;
908 bdata = &bootmem_node_data[early_pfn_to_nid(pfn)];
e70260aa 909
75a56cfe 910 return alloc_bootmem_core(bdata, size, SMP_CACHE_BYTES, goal, limit);
08677214 911#endif
e70260aa
YG
912}
913#endif
914
b54bbf7b
AK
915void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
916 unsigned long align, unsigned long goal)
917{
918 void *ptr;
919
c91c4773
PE
920 if (WARN_ON_ONCE(slab_is_available()))
921 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
922
08677214
YL
923#ifdef CONFIG_NO_BOOTMEM
924 ptr = __alloc_memory_core_early(pgdat->node_id, size, align,
925 goal, -1ULL);
926#else
d0c4f570
TH
927 ptr = alloc_arch_preferred_bootmem(pgdat->bdata, size, align, goal, 0);
928 if (ptr)
929 return ptr;
930
b54bbf7b 931 ptr = alloc_bootmem_core(pgdat->bdata, size, align, goal, 0);
08677214 932#endif
b54bbf7b
AK
933 if (ptr)
934 return ptr;
935
936 return __alloc_bootmem_nopanic(size, align, goal);
937}
938
dfd54cbc
HC
939#ifndef ARCH_LOW_ADDRESS_LIMIT
940#define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL
941#endif
008857c1 942
a66fd7da
JW
943/**
944 * __alloc_bootmem_low - allocate low boot memory
945 * @size: size of the request in bytes
946 * @align: alignment of the region
947 * @goal: preferred starting address of the region
948 *
949 * The goal is dropped if it can not be satisfied and the allocation will
950 * fall back to memory below @goal.
951 *
952 * Allocation may happen on any node in the system.
953 *
954 * The function panics if the request can not be satisfied.
955 */
bb0923a6
FBH
956void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
957 unsigned long goal)
008857c1 958{
0f3caba2 959 return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
008857c1
RT
960}
961
a66fd7da
JW
962/**
963 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
964 * @pgdat: node to allocate from
965 * @size: size of the request in bytes
966 * @align: alignment of the region
967 * @goal: preferred starting address of the region
968 *
969 * The goal is dropped if it can not be satisfied and the allocation will
970 * fall back to memory below @goal.
971 *
972 * Allocation may fall back to any node in the system if the specified node
973 * can not hold the requested memory.
974 *
975 * The function panics if the request can not be satisfied.
976 */
008857c1
RT
977void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
978 unsigned long align, unsigned long goal)
979{
c91c4773
PE
980 if (WARN_ON_ONCE(slab_is_available()))
981 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
982
08677214
YL
983#ifdef CONFIG_NO_BOOTMEM
984 return __alloc_memory_core_early(pgdat->node_id, size, align,
985 goal, ARCH_LOW_ADDRESS_LIMIT);
986#else
4cc278b7
JW
987 return ___alloc_bootmem_node(pgdat->bdata, size, align,
988 goal, ARCH_LOW_ADDRESS_LIMIT);
08677214 989#endif
008857c1 990}