aboutsummaryrefslogtreecommitdiff
path: root/mm/memblock.c
blob: ccbf97339592fe2335dfe6994fed8112f3ecdfc5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
/*
 * Procedures for maintaining information about logical memory blocks.
 *
 * Peter Bergner, IBM Corp.	June 2001.
 * Copyright (C) 2001 Peter Bergner.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/bitops.h>
#include <linux/poison.h>
#include <linux/pfn.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/memblock.h>

struct memblock memblock __initdata_memblock;

int memblock_debug __initdata_memblock;
int memblock_can_resize __initdata_memblock;
static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS + 1] __initdata_memblock;
static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS + 1] __initdata_memblock;

/* inline so we don't get a warning when pr_debug is compiled out */
static inline const char *memblock_type_name(struct memblock_type *type)
{
	if (type == &memblock.memory)
		return "memory";
	else if (type == &memblock.reserved)
		return "reserved";
	else
		return "unknown";
}

/*
 * Address comparison utilities
 */

static phys_addr_t __init_memblock memblock_align_down(phys_addr_t addr, phys_addr_t size)
{
	return addr & ~(size - 1);
}

static phys_addr_t __init_memblock memblock_align_up(phys_addr_t addr, phys_addr_t size)
{
	return (addr + (size - 1)) & ~(size - 1);
}

static unsigned long __init_memblock memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1,
				       phys_addr_t base2, phys_addr_t size2)
{
	return ((base1 < (base2 + size2)) && (base2 < (base1 + size1)));
}

long __init_memblock memblock_overlaps_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size)
{
	unsigned long i;

	for (i = 0; i < type->cnt; i++) {
		phys_addr_t rgnbase = type->regions[i].base;
		phys_addr_t rgnsize = type->regions[i].size;
		if (memblock_addrs_overlap(base, size, rgnbase, rgnsize))
			break;
	}

	return (i < type->cnt) ? i : -1;
}

/*
 * Find, allocate, deallocate or reserve unreserved regions. All allocations
 * are top-down.
 */

static phys_addr_t __init_memblock memblock_find_region(phys_addr_t start, phys_addr_t end,
					  phys_addr_t size, phys_addr_t align)
{
	phys_addr_t base, res_base;
	long j;

	/* In case, huge size is requested */
	if (end < size)
		return MEMBLOCK_ERROR;

	base = memblock_align_down((end - size), align);

	/* Prevent allocations returning 0 as it's also used to
	 * indicate an allocation failure
	 */
	if (start == 0)
		start = PAGE_SIZE;

	while (start <= base) {
		j = memblock_overlaps_region(&memblock.reserved, base, size);
		if (j < 0)
			return base;
		res_base = memblock.reserved.regions[j].base;
		if (res_base < size)
			break;
		base = memblock_align_down(res_base - size, align);
	}

	return MEMBLOCK_ERROR;
}

static phys_addr_t __init_memblock memblock_find_base(phys_addr_t size,
			phys_addr_t align, phys_addr_t start, phys_addr_t end)
{
	long i;

	BUG_ON(0 == size);

	/* Pump up max_addr */
	if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
		end = memblock.current_limit;

	/* We do a top-down search, this tends to limit memory
	 * fragmentation by keeping early boot allocs near the
	 * top of memory
	 */
	for (i = memblock.memory.cnt - 1; i >= 0; i--) {
		phys_addr_t memblockbase = memblock.memory.regions[i].base;
		phys_addr_t memblocksize = memblock.memory.regions[i].size;
		phys_addr_t bottom, top, found;

		if (memblocksize < size)
			continue;
		if ((memblockbase + memblocksize) <= start)
			break;
		bottom = max(memblockbase, start);
		top = min(memblockbase + memblocksize, end);
		if (bottom >= top)
			continue;
		found = memblock_find_region(bottom, top, size, align);
		if (found != MEMBLOCK_ERROR)
			return found;
	}
	return MEMBLOCK_ERROR;
}

/*
 * Find a free area with specified alignment in a specific range.
 */
u64 __init_memblock memblock_find_in_range(u64 start, u64 end, u64 size, u64 align)
{
	return memblock_find_base(size, align, start, end);
}

/*
 * Free memblock.reserved.regions
 */
int __init_memblock memblock_free_reserved_regions(void)
{
	if (memblock.reserved.regions == memblock_reserved_init_regions)
		return 0;

	return memblock_free(__pa(memblock.reserved.regions),
		 sizeof(struct memblock_region) * memblock.reserved.max);
}

/*
 * Reserve memblock.reserved.regions
 */
int __init_memblock memblock_reserve_reserved_regions(void)
{
	if (memblock.reserved.regions == memblock_reserved_init_regions)
		return 0;

	return memblock_reserve(__pa(memblock.reserved.regions),
		 sizeof(struct memblock_region) * memblock.reserved.max);
}

static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r)
{
	unsigned long i;

	for (i = r; i < type->cnt - 1; i++) {
		type->regions[i].base = type->regions[i + 1].base;
		type->regions[i].size = type->regions[i + 1].size;
	}
	type->cnt--;

	/* Special case for empty arrays */
	if (type->cnt == 0) {
		type->cnt = 1;
		type->regions[0].base = 0;
		type->regions[0].size = 0;
	}
}

/* Defined below but needed now */
static long memblock_add_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size);

static int __init_memblock memblock_double_array(struct memblock_type *type)
{
	struct memblock_region *new_array, *old_array;
	phys_addr_t old_size, new_size, addr;
	int use_slab = slab_is_available();

	/* We don't allow resizing until we know about the reserved regions
	 * of memory that aren't suitable for allocation
	 */
	if (!memblock_can_resize)
		return -1;

	/* Calculate new doubled size */
	old_size = type->max * sizeof(struct memblock_region);
	new_size = old_size << 1;

	/* Try to find some space for it.
	 *
	 * WARNING: We assume that either slab_is_available() and we use it or
	 * we use MEMBLOCK for allocations. That means that this is unsafe to use
	 * when bootmem is currently active (unless bootmem itself is implemented
	 * on top of MEMBLOCK which isn't the case yet)
	 *
	 * This should however not be an issue for now, as we currently only
	 * call into MEMBLOCK while it's still active, or much later when slab is
	 * active for memory hotplug operations
	 */
	if (use_slab) {
		new_array = kmalloc(new_size, GFP_KERNEL);
		addr = new_array == NULL ? MEMBLOCK_ERROR : __pa(new_array);
	} else
		addr = memblock_find_base(new_size, sizeof(phys_addr_t), 0, MEMBLOCK_ALLOC_ACCESSIBLE);
	if (addr == MEMBLOCK_ERROR) {
		pr_err("memblock: Failed to double %s array from %ld to %ld entries !\n",
		       memblock_type_name(type), type->max, type->max * 2);
		return -1;
	}
	new_array = __va(addr);

	memblock_dbg("memblock: %s array is doubled to %ld at [%#010llx-%#010llx]",
		 memblock_type_name(type), type->max * 2, (u64)addr, (u64)addr + new_size - 1);

	/* Found space, we now need to move the array over before
	 * we add the reserved region since it may be our reserved
	 * array itself that is full.
	 */
	memcpy(new_array, type->regions, old_size);
	memset(new_array + type->max, 0, old_size);
	old_array = type->regions;
	type->regions = new_array;
	type->max <<= 1;

	/* If we use SLAB that's it, we are done */
	if (use_slab)
		return 0;

	/* Add the new reserved region now. Should not fail ! */
	BUG_ON(memblock_add_region(&memblock.reserved, addr, new_size));

	/* If the array wasn't our static init one, then free it. We only do
	 * that before SLAB is available as later on, we don't know whether
	 * to use kfree or free_bootmem_pages(). Shouldn't be a big deal
	 * anyways
	 */
	if (old_array != memblock_memory_init_regions &&
	    old_array != memblock_reserved_init_regions)
		memblock_free(__pa(old_array), old_size);

	return 0;
}

extern int __init_memblock __weak memblock_memory_can_coalesce(phys_addr_t addr1, phys_addr_t size1,
					  phys_addr_t addr2, phys_addr_t size2)
{
	return 1;
}

static long __init_memblock memblock_add_region(struct memblock_type *type,
						phys_addr_t base, phys_addr_t size)
{
	phys_addr_t end = base + size;
	int i, slot = -1;

	/* First try and coalesce this MEMBLOCK with others */
	for (i = 0; i < type->cnt; i++) {
		struct memblock_region *rgn = &type->regions[i];
		phys_addr_t rend = rgn->base + rgn->size;

		/* Exit if there's no possible hits */
		if (rgn->base > end || rgn->size == 0)
			break;

		/* Check if we are fully enclosed within an existing
		 * block
		 */
		if (rgn->base <= base && rend >= end)
			return 0;

		/* Check if we overlap or are adjacent with the bottom
		 * of a block.
		 */
		if (base < rgn->base && end >= rgn->base) {
			/* If we can't coalesce, create a new block */
			if (!memblock_memory_can_coalesce(base, size,
							  rgn->base,
							  rgn->size)) {
				/* Overlap & can't coalesce are mutually
				 * exclusive, if you do that, be prepared
				 * for trouble
				 */
				WARN_ON(end != rgn->base);
				goto new_block;
			}
			/* We extend the bottom of the block down to our
			 * base
			 */
			rgn->base = base;
			rgn->size = rend - base;

			/* Return if we have nothing else to allocate
			 * (fully coalesced)
			 */
			if (rend >= end)
				return 0;

			/* We continue processing from the end of the
			 * coalesced block.
			 */
			base = rend;
			size = end - base;
		}

		/* Now check if we overlap or are adjacent with the
		 * top of a block
		 */
		if (base <= rend && end >= rend) {
			/* If we can't coalesce, create a new block */
			if (!memblock_memory_can_coalesce(rgn->base,
							  rgn->size,
							  base, size)) {
				/* Overlap & can't coalesce are mutually
				 * exclusive, if you do that, be prepared
				 * for trouble
				 */
				WARN_ON(rend != base);
				goto new_block;
			}
			/* We adjust our base down to enclose the
			 * original block and destroy it. It will be
			 * part of our new allocation. Since we've
			 * freed an entry, we know we won't fail
			 * to allocate one later, so we won't risk
			 * losing the original block allocation.
			 */
			size += (base - rgn->base);
			base = rgn->base;
			memblock_remove_region(type, i--);
		}
	}

	/* If the array is empty, special case, replace the fake
	 * filler region and return
	 */
	if ((type->cnt == 1) && (type->regions[0].size == 0)) {
		type->regions[0].base = base;
		type->regions[0].size = size;
		return 0;
	}

 new_block:
	/* If we are out of space, we fail. It's too late to resize the array
	 * but then this shouldn't have happened in the first place.
	 */
	if (WARN_ON(type->cnt >= type->max))
		return -1;

	/* Couldn't coalesce the MEMBLOCK, so add it to the sorted table. */
	for (i = type->cnt - 1; i >= 0; i--) {
		if (base < type->regions[i].base) {
			type->regions[i+1].base = type->regions[i].base;
			type->regions[i+1].size = type->regions[i].size;
		} else {
			type->regions[i+1].base = base;
			type->regions[i+1].size = size;
			slot = i + 1;
			break;
		}
	}
	if (base < type->regions[0].base) {
		type->regions[0].base = base;
		type->regions[0].size = size;
		slot = 0;
	}
	type->cnt++;

	/* The array is full ? Try to resize it. If that fails, we undo
	 * our allocation and return an error
	 */
	if (type->cnt == type->max && memblock_double_array(type)) {
		BUG_ON(slot < 0);
		memblock_remove_region(type, slot);
		return -1;
	}

	return 0;
}

long __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
{
	return memblock_add_region(&memblock.memory, base, size);

}

static long __init_memblock __memblock_remove(struct memblock_type *type,
					      phys_addr_t base, phys_addr_t size)
{
	phys_addr_t end = base + size;
	int i;

	/* Walk through the array for collisions */
	for (i = 0; i < type->cnt; i++) {
		struct memblock_region *rgn = &type->regions[i];
		phys_addr_t rend = rgn->base + rgn->size;

		/* Nothing more to do, exit */
		if (rgn->base > end || rgn->size == 0)
			break;

		/* If we fully enclose the block, drop it */
		if (base <= rgn->base && end >= rend) {
			memblock_remove_region(type, i--);
			continue;
		}

		/* If we are fully enclosed within a block
		 * then we need to split it and we are done
		 */
		if (base > rgn->base && end < rend) {
			rgn->size = base - rgn->base;
			if (!memblock_add_region(type, end, rend - end))
				return 0;
			/* Failure to split is bad, we at least
			 * restore the block before erroring
			 */
			rgn->size = rend - rgn->base;
			WARN_ON(1);
			return -1;
		}

		/* Check if we need to trim the bottom of a block */
		if (rgn->base < end && rend > end) {
			rgn->size -= end - rgn->base;
			rgn->base = end;
			break;
		}

		/* And check if we need to trim the top of a block */
		if (base < rend)
			rgn->size -= rend - base;

	}
	return 0;
}

long __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size)
{
	return __memblock_remove(&memblock.memory, base, size);
}

long __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
{
	return __memblock_remove(&memblock.reserved, base, size);
}

long __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
{
	struct memblock_type *_rgn = &memblock.reserved;

	BUG_ON(0 == size);

	return memblock_add_region(_rgn, base, size);
}

phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
{
	phys_addr_t found;

	/* We align the size to limit fragmentation. Without this, a lot of
	 * small allocs quickly eat up the whole reserve array on sparc
	 */
	size = memblock_align_up(size, align);

	found = memblock_find_base(size, align, 0, max_addr);
	if (found != MEMBLOCK_ERROR &&
	    !memblock_add_region(&memblock.reserved, found, size))
		return found;

	return 0;
}

phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
{
	phys_addr_t alloc;

	alloc = __memblock_alloc_base(size, align, max_addr);

	if (alloc == 0)
		panic("ERROR: Failed to allocate 0x%llx bytes below 0x%llx.\n",
		      (unsigned long long) size, (unsigned long long) max_addr);

	return alloc;
}

phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align)
{
	return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
}


/*
 * Additional node-local allocators. Search for node memory is bottom up
 * and walks memblock regions within that node bottom-up as well, but allocation
 * within an memblock region is top-down. XXX I plan to fix that at some stage
 *
 * WARNING: Only available after early_node_map[] has been populated,
 * on some architectures, that is after all the calls to add_active_range()
 * have been done to populate it.
 */

phys_addr_t __weak __init memblock_nid_range(phys_addr_t start, phys_addr_t end, int *nid)
{
#ifdef CONFIG_ARCH_POPULATES_NODE_MAP
	/*
	 * This code originates from sparc which really wants use to walk by addresses
	 * and returns the nid. This is not very convenient for early_pfn_map[] users
	 * as the map isn't sorted yet, and it really wants to be walked by nid.
	 *
	 * For now, I implement the inefficient method below which walks the early
	 * map multiple times. Eventually we may want to use an ARCH config option
	 * to implement a completely different method for both case.
	 */
	unsigned long start_pfn, end_pfn;
	int i;

	for (i = 0; i < MAX_NUMNODES; i++) {
		get_pfn_range_for_nid(i, &start_pfn, &end_pfn);
		if (start < PFN_PHYS(start_pfn) || start >= PFN_PHYS(end_pfn))
			continue;
		*nid = i;
		return min(end, PFN_PHYS(end_pfn));
	}
#endif
	*nid = 0;

	return end;
}

static phys_addr_t __init memblock_alloc_nid_region(struct memblock_region *mp,
					       phys_addr_t size,
					       phys_addr_t align, int nid)
{
	phys_addr_t start, end;

	start = mp->base;
	end = start + mp->size;

	start = memblock_align_up(start, align);
	while (start < end) {
		phys_addr_t this_end;
		int this_nid;

		this_end = memblock_nid_range(start, end, &this_nid);
		if (this_nid == nid) {
			phys_addr_t ret = memblock_find_region(start, this_end, size, align);
			if (ret != MEMBLOCK_ERROR &&
			    !memblock_add_region(&memblock.reserved, ret, size))
				return ret;
		}
		start = this_end;
	}

	return MEMBLOCK_ERROR;
}

phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
{
	struct memblock_type *mem = &memblock.memory;
	int i;

	BUG_ON(0 == size);

	/* We align the size to limit fragmentation. Without this, a lot of
	 * small allocs quickly eat up the whole reserve array on sparc
	 */
	size = memblock_align_up(size, align);

	/* We do a bottom-up search for a region with the right
	 * nid since that's easier considering how memblock_nid_range()
	 * works
	 */
	for (i = 0; i < mem->cnt; i++) {
		phys_addr_t ret = memblock_alloc_nid_region(&mem->regions[i],
					       size, align, nid);
		if (ret != MEMBLOCK_ERROR)
			return ret;
	}

	return 0;
}

phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid)
{
	phys_addr_t res = memblock_alloc_nid(size, align, nid);

	if (res)
		return res;
	return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ANYWHERE);
}


/*
 * Remaining API functions
 */

/* You must call memblock_analyze() before this. */
phys_addr_t __init memblock_phys_mem_size(void)
{
	return memblock.memory_size;
}

phys_addr_t __init_memblock memblock_end_of_DRAM(void)
{
	int idx = memblock.memory.cnt - 1;

	return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size);
}

/* You must call memblock_analyze() after this. */
void __init memblock_enforce_memory_limit(phys_addr_t memory_limit)
{
	unsigned long i;
	phys_addr_t limit;
	struct memblock_region *p;

	if (!memory_limit)
		return;

	/* Truncate the memblock regions to satisfy the memory limit. */
	limit = memory_limit;
	for (i = 0; i < memblock.memory.cnt; i++) {
		if (limit > memblock.memory.regions[i].size) {
			limit -= memblock.memory.regions[i].size;
			continue;
		}

		memblock.memory.regions[i].size = limit;
		memblock.memory.cnt = i + 1;
		break;
	}

	memory_limit = memblock_end_of_DRAM();

	/* And truncate any reserves above the limit also. */
	for (i = 0; i < memblock.reserved.cnt; i++) {
		p = &memblock.reserved.regions[i];

		if (p->base > memory_limit)
			p->size = 0;
		else if ((p->base + p->size) > memory_limit)
			p->size = memory_limit - p->base;

		if (p->size == 0) {
			memblock_remove_region(&memblock.reserved, i);
			i--;
		}
	}
}

static int __init_memblock memblock_search(struct memblock_type *type, phys_addr_t addr)
{
	unsigned int left = 0, right = type->cnt;

	do {
		unsigned int mid = (right + left) / 2;

		if (addr < type->regions[mid].base)
			right = mid;
		else if (addr >= (type->regions[mid].base +
				  type->regions[mid].size))
			left = mid + 1;
		else
			return mid;
	} while (left < right);
	return -1;
}

int __init memblock_is_reserved(phys_addr_t addr)
{
	return memblock_search(&memblock.reserved, addr) != -1;
}

int __init_memblock memblock_is_memory(phys_addr_t addr)
{
	return memblock_search(&memblock.memory, addr) != -1;
}

int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
{
	int idx = memblock_search(&memblock.memory, base);

	if (idx == -1)
		return 0;
	return memblock.memory.regions[idx].base <= base &&
		(memblock.memory.regions[idx].base +
		 memblock.memory.regions[idx].size) >= (base + size);
}

int __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
{
	return memblock_overlaps_region(&memblock.reserved, base, size) >= 0;
}


void __init_memblock memblock_set_current_limit(phys_addr_t limit)
{
	memblock.current_limit = limit;
}

static void __init_memblock memblock_dump(struct memblock_type *region, char *name)
{
	unsigned long long base, size;
	int i;

	pr_info(" %s.cnt  = 0x%lx\n", name, region->cnt);

	for (i = 0; i < region->cnt; i++) {
		base = region->regions[i].base;
		size = region->regions[i].size;

		pr_info(" %s[%#x]\t[%#016llx-%#016llx], %#llx bytes\n",
		    name, i, base, base + size - 1, size);
	}
}

void __init_memblock memblock_dump_all(void)
{
	if (!memblock_debug)
		return;

	pr_info("MEMBLOCK configuration:\n");
	pr_info(" memory size = 0x%llx\n", (unsigned long long)memblock.memory_size);

	memblock_dump(&memblock.memory, "memory");
	memblock_dump(&memblock.reserved, "reserved");
}

void __init memblock_analyze(void)
{
	int i;

	/* Check marker in the unused last array entry */
	WARN_ON(memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS].base
		!= MEMBLOCK_INACTIVE);
	WARN_ON(memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS].base
		!= MEMBLOCK_INACTIVE);

	memblock.memory_size = 0;

	for (i = 0; i < memblock.memory.cnt; i++)
		memblock.memory_size += memblock.memory.regions[i].size;

	/* We allow resizing from there */
	memblock_can_resize = 1;
}

void __init memblock_init(void)
{
	static int init_done __initdata = 0;

	if (init_done)
		return;
	init_done = 1;

	/* Hookup the initial arrays */
	memblock.memory.regions	= memblock_memory_init_regions;
	memblock.memory.max		= INIT_MEMBLOCK_REGIONS;
	memblock.reserved.regions	= memblock_reserved_init_regions;
	memblock.reserved.max	= INIT_MEMBLOCK_REGIONS;

	/* Write a marker in the unused last array entry */
	memblock.memory.regions[INIT_MEMBLOCK_REGIONS].base = MEMBLOCK_INACTIVE;
	memblock.reserved.regions[INIT_MEMBLOCK_REGIONS].base = MEMBLOCK_INACTIVE;

	/* Create a dummy zero size MEMBLOCK which will get coalesced away later.
	 * This simplifies the memblock_add() code below...
	 */
	memblock.memory.regions[0].base = 0;
	memblock.memory.regions[0].size = 0;
	memblock.memory.cnt = 1;

	/* Ditto. */
	memblock.reserved.regions[0].base = 0;
	memblock.reserved.regions[0].size = 0;
	memblock.reserved.cnt = 1;

	memblock.current_limit = MEMBLOCK_ALLOC_ANYWHERE;
}

static int __init early_memblock(char *p)
{
	if (p && strstr(p, "debug"))
		memblock_debug = 1;
	return 0;
}
early_param("memblock", early_memblock);

#if defined(CONFIG_DEBUG_FS) && !defined(ARCH_DISCARD_MEMBLOCK)

static int memblock_debug_show(struct seq_file *m, void *private)
{
	struct memblock_type *type = m->private;
	struct memblock_region *reg;
	int i;

	for (i = 0; i < type->cnt; i++) {
		reg = &type->regions[i];
		seq_printf(m, "%4d: ", i);
		if (sizeof(phys_addr_t) == 4)
			seq_printf(m, "0x%08lx..0x%08lx\n",
				   (unsigned long)reg->base,
				   (unsigned long)(reg->base + reg->size - 1));
		else
			seq_printf(m, "0x%016llx..0x%016llx\n",
				   (unsigned long long)reg->base,
				   (unsigned long long)(reg->base + reg->size - 1));

	}
	return 0;
}

static int memblock_debug_open(struct inode *inode, struct file *file)
{
	return single_open(file, memblock_debug_show, inode->i_private);
}

static const struct file_operations memblock_debug_fops = {
	.open = memblock_debug_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
};

static int __init memblock_init_debugfs(void)
{
	struct dentry *root = debugfs_create_dir("memblock", NULL);
	if (!root)
		return -ENXIO;
	debugfs_create_file("memory", S_IRUGO, root, &memblock.memory, &memblock_debug_fops);
	debugfs_create_file("reserved", S_IRUGO, root, &memblock.reserved, &memblock_debug_fops);

	return 0;
}
__initcall(memblock_init_debugfs);

#endif /* CONFIG_DEBUG_FS */