mm/memblock.c



95f72d1ed41a


142b45a72e22
95f72d1ed41a

449e8df39d3f
c196f76fd5ec
6d03b885f092

95f72d1ed41a

fe091c208a40


95f72d1ed41a
10d0643988e9
1aadc0560f46
181eb39425f2

95f72d1ed41a
142b45a72e22
c22331166b49

142b45a72e22


eb18f1b5bfb9


6ed311b28221


10d0643988e9
2898cc4cdf20
95f72d1ed41a


2d7d3eb2bad1

6ed311b28221


7bd0b0f0da3b


6ed311b28221
7bd0b0f0da3b


6ed311b28221
7bd0b0f0da3b

6ed311b28221
7bd0b0f0da3b


f1af98c7629a
5d53cb27d849

7bd0b0f0da3b
f1af98c7629a
7bd0b0f0da3b


6ed311b28221
5d53cb27d849


7bd0b0f0da3b


1f5026a7e21e
6ed311b28221

7bd0b0f0da3b


fc769a8e70a3
7bd0b0f0da3b


6ed311b28221
7bd0b0f0da3b

6ed311b28221

10d0643988e9
95f72d1ed41a
1440c4e2c918
7c0caeb866b0

e3239ff92a17
95f72d1ed41a
8f7a66051b75

1440c4e2c918
8f7a66051b75


7c0caeb866b0
8f7a66051b75
95f72d1ed41a

29f6738609e4


48c3b583bbdd


142b45a72e22

29f6738609e4
142b45a72e22

181eb39425f2
142b45a72e22


142b45a72e22


29f6738609e4


142b45a72e22
181eb39425f2


142b45a72e22


fd07383b6bbc


142b45a72e22

fd07383b6bbc

142b45a72e22


1f5026a7e21e
4e2f07750d9a
48c3b583bbdd


29f6738609e4
48c3b583bbdd

fd07383b6bbc

48c3b583bbdd
15674868d6c5
4e2f07750d9a
1f5026a7e21e
142b45a72e22


142b45a72e22
fd07383b6bbc


ea9e4376bb54
fd07383b6bbc


142b45a72e22


fd07383b6bbc
181eb39425f2


29f6738609e4
142b45a72e22
fd07383b6bbc


181eb39425f2

29f6738609e4
181eb39425f2


142b45a72e22


784656f9c680


95f72d1ed41a
784656f9c680
95f72d1ed41a
784656f9c680


95f72d1ed41a
7c0caeb866b0


784656f9c680


8f7a66051b75

784656f9c680


95f72d1ed41a
784656f9c680
95f72d1ed41a
784656f9c680


7c0caeb866b0
784656f9c680


7c0caeb866b0
784656f9c680
1440c4e2c918
784656f9c680


7fb0bc3f06fd
784656f9c680


581adcbe1218
7fb0bc3f06fd
784656f9c680

eb18f1b5bfb9

784656f9c680

b3dc627cabb3


784656f9c680

1440c4e2c918
8f7a66051b75

7fb0bc3f06fd
1440c4e2c918
8f7a66051b75
95f72d1ed41a
784656f9c680


142b45a72e22
784656f9c680

95f72d1ed41a
784656f9c680


95f72d1ed41a
784656f9c680


7fb0bc3f06fd
95f72d1ed41a
784656f9c680

95f72d1ed41a
784656f9c680


7fb0bc3f06fd
95f72d1ed41a
95f72d1ed41a
784656f9c680


142b45a72e22
784656f9c680

48c3b583bbdd
784656f9c680


142b45a72e22
95f72d1ed41a

7fb0bc3f06fd


581adcbe1218
95f72d1ed41a
7fb0bc3f06fd
95f72d1ed41a

6a9ceb31c06f


eb18f1b5bfb9
6a9ceb31c06f


b3dc627cabb3


6a9ceb31c06f

48c3b583bbdd
6a9ceb31c06f


1440c4e2c918

6a9ceb31c06f
719361809fde
6a9ceb31c06f


1440c4e2c918

6a9ceb31c06f
719361809fde
6a9ceb31c06f


6a9ceb31c06f
581adcbe1218

95f72d1ed41a
719361809fde

95f72d1ed41a
719361809fde


95f72d1ed41a
719361809fde

8f7a66051b75
95f72d1ed41a

581adcbe1218
95f72d1ed41a


581adcbe1218
95f72d1ed41a
24aa07882b67
a150439c4a97


24aa07882b67
95f72d1ed41a


581adcbe1218
95f72d1ed41a
e3239ff92a17
95f72d1ed41a
24aa07882b67
a150439c4a97


95f72d1ed41a
7fb0bc3f06fd
95f72d1ed41a

35fd0808d7d8


dad7557eb705


35fd0808d7d8


7bd0b0f0da3b


dad7557eb705


7bd0b0f0da3b


7c0caeb866b0


6a9ceb31c06f

7c0caeb866b0
6a9ceb31c06f


7c0caeb866b0
6a9ceb31c06f
e9d24ad30fc5
7c0caeb866b0


7bd0b0f0da3b


95f72d1ed41a
6ed311b28221
95f72d1ed41a
847854f5988a


7bd0b0f0da3b
9c8c27e2b89b
6ed311b28221
95f72d1ed41a
6ed311b28221
95f72d1ed41a

7bd0b0f0da3b


6ed311b28221
95f72d1ed41a
6ed311b28221


95f72d1ed41a

6ed311b28221
95f72d1ed41a
6ed311b28221

95f72d1ed41a
9d1e24928e6a


15fb09722df3
95f72d1ed41a

9d1e24928e6a


2898cc4cdf20
95f72d1ed41a
1440c4e2c918
95f72d1ed41a

0a93ebef698b


10d0643988e9
95f72d1ed41a


e3239ff92a17
95f72d1ed41a

c0ce8fef5589
95f72d1ed41a

c0ce8fef5589
95f72d1ed41a
c0ce8fef5589
95f72d1ed41a

c0ce8fef5589
95f72d1ed41a
c0ce8fef5589
95f72d1ed41a
c0ce8fef5589


95f72d1ed41a
c0ce8fef5589
95f72d1ed41a
c0ce8fef5589


95f72d1ed41a

cd79481d27b9
72d4b0b4e0e7


2898cc4cdf20
95f72d1ed41a
72d4b0b4e0e7

95f72d1ed41a
3661ca66a42e
72d4b0b4e0e7


eab309494ae2


3661ca66a42e
72d4b0b4e0e7
abb65272a190
eb18f1b5bfb9
72d4b0b4e0e7


abb65272a190

eb18f1b5bfb9
95f72d1ed41a

eab309494ae2


10d0643988e9
95f72d1ed41a
eb18f1b5bfb9
f1c2c19c498e
95f72d1ed41a

6ede1fd3cb40


e63075a3c937
3661ca66a42e
e63075a3c937


7c0caeb866b0
6ed311b28221


7c0caeb866b0
6ed311b28221
7c0caeb866b0


6ed311b28221


4ff7b82f1e5f
6ed311b28221
6ed311b28221
1440c4e2c918


6ed311b28221


1aadc0560f46
6ed311b28221
142b45a72e22
6ed311b28221

6ed311b28221


c378ddd53f9b
6d03b885f092


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
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058


/*
 * 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>

static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;

struct memblock memblock __initdata_memblock = {
	.memory.regions		= memblock_memory_init_regions,
	.memory.cnt		= 1,	/* empty dummy entry */
	.memory.max		= INIT_MEMBLOCK_REGIONS,

	.reserved.regions	= memblock_reserved_init_regions,
	.reserved.cnt		= 1,	/* empty dummy entry */
	.reserved.max		= INIT_MEMBLOCK_REGIONS,

	.current_limit		= MEMBLOCK_ALLOC_ANYWHERE,
};

int memblock_debug __initdata_memblock;
static int memblock_can_resize __initdata_memblock;
static int memblock_memory_in_slab __initdata_memblock = 0;
static int memblock_reserved_in_slab __initdata_memblock = 0;

/* inline so we don't get a warning when pr_debug is compiled out */
static __init_memblock 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";
}

/* adjust *@size so that (@base + *@size) doesn't overflow, return new size */
static inline phys_addr_t memblock_cap_size(phys_addr_t base, phys_addr_t *size)
{
	return *size = min(*size, (phys_addr_t)ULLONG_MAX - base);
}

/*
 * Address comparison utilities
 */
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)));
}

static 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;
}

/**
 * memblock_find_in_range_node - find free area in given range and node
 * @start: start of candidate range
 * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
 * @size: size of free area to find
 * @align: alignment of free area to find
 * @nid: nid of the free area to find, %MAX_NUMNODES for any node
 *
 * Find @size free area aligned to @align in the specified range and node.
 *
 * RETURNS:
 * Found address on success, %0 on failure.
 */
phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t start,
					phys_addr_t end, phys_addr_t size,
					phys_addr_t align, int nid)
{
	phys_addr_t this_start, this_end, cand;
	u64 i;

	/* pump up @end */
	if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
		end = memblock.current_limit;

	/* avoid allocating the first page */
	start = max_t(phys_addr_t, start, PAGE_SIZE);
	end = max(start, end);

	for_each_free_mem_range_reverse(i, nid, &this_start, &this_end, NULL) {
		this_start = clamp(this_start, start, end);
		this_end = clamp(this_end, start, end);

		if (this_end < size)
			continue;

		cand = round_down(this_end - size, align);
		if (cand >= this_start)
			return cand;
	}
	return 0;
}

/**
 * memblock_find_in_range - find free area in given range
 * @start: start of candidate range
 * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
 * @size: size of free area to find
 * @align: alignment of free area to find
 *
 * Find @size free area aligned to @align in the specified range.
 *
 * RETURNS:
 * Found address on success, %0 on failure.
 */
phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start,
					phys_addr_t end, phys_addr_t size,
					phys_addr_t align)
{
	return memblock_find_in_range_node(start, end, size, align,
					   MAX_NUMNODES);
}

static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r)
{
	type->total_size -= type->regions[r].size;
	memmove(&type->regions[r], &type->regions[r + 1],
		(type->cnt - (r + 1)) * sizeof(type->regions[r]));
	type->cnt--;

	/* Special case for empty arrays */
	if (type->cnt == 0) {
		WARN_ON(type->total_size != 0);
		type->cnt = 1;
		type->regions[0].base = 0;
		type->regions[0].size = 0;
		memblock_set_region_node(&type->regions[0], MAX_NUMNODES);
	}
}

phys_addr_t __init_memblock get_allocated_memblock_reserved_regions_info(
					phys_addr_t *addr)
{
	if (memblock.reserved.regions == memblock_reserved_init_regions)
		return 0;

	*addr = __pa(memblock.reserved.regions);

	return PAGE_ALIGN(sizeof(struct memblock_region) *
			  memblock.reserved.max);
}

/**
 * memblock_double_array - double the size of the memblock regions array
 * @type: memblock type of the regions array being doubled
 * @new_area_start: starting address of memory range to avoid overlap with
 * @new_area_size: size of memory range to avoid overlap with
 *
 * Double the size of the @type regions array. If memblock is being used to
 * allocate memory for a new reserved regions array and there is a previously
 * allocated memory range [@new_area_start,@new_area_start+@new_area_size]
 * waiting to be reserved, ensure the memory used by the new array does
 * not overlap.
 *
 * RETURNS:
 * 0 on success, -1 on failure.
 */
static int __init_memblock memblock_double_array(struct memblock_type *type,
						phys_addr_t new_area_start,
						phys_addr_t new_area_size)
{
	struct memblock_region *new_array, *old_array;
	phys_addr_t old_alloc_size, new_alloc_size;
	phys_addr_t old_size, new_size, addr;
	int use_slab = slab_is_available();
	int *in_slab;

	/* 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;
	/*
	 * We need to allocated new one align to PAGE_SIZE,
	 *   so we can free them completely later.
	 */
	old_alloc_size = PAGE_ALIGN(old_size);
	new_alloc_size = PAGE_ALIGN(new_size);

	/* Retrieve the slab flag */
	if (type == &memblock.memory)
		in_slab = &memblock_memory_in_slab;
	else
		in_slab = &memblock_reserved_in_slab;

	/* 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 ? __pa(new_array) : 0;
	} else {
		/* only exclude range when trying to double reserved.regions */
		if (type != &memblock.reserved)
			new_area_start = new_area_size = 0;

		addr = memblock_find_in_range(new_area_start + new_area_size,
						memblock.current_limit,
						new_alloc_size, PAGE_SIZE);
		if (!addr && new_area_size)
			addr = memblock_find_in_range(0,
				min(new_area_start, memblock.current_limit),
				new_alloc_size, PAGE_SIZE);

		new_array = addr ? __va(addr) : NULL;
	}
	if (!addr) {
		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;
	}

	memblock_dbg("memblock: %s 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;

	/* Free old array. We needn't free it if the array is the static one */
	if (*in_slab)
		kfree(old_array);
	else if (old_array != memblock_memory_init_regions &&
		 old_array != memblock_reserved_init_regions)
		memblock_free(__pa(old_array), old_alloc_size);

	/*
	 * Reserve the new array if that comes from the memblock.  Otherwise, we
	 * needn't do it
	 */
	if (!use_slab)
		BUG_ON(memblock_reserve(addr, new_alloc_size));

	/* Update slab flag */
	*in_slab = use_slab;

	return 0;
}

/**
 * memblock_merge_regions - merge neighboring compatible regions
 * @type: memblock type to scan
 *
 * Scan @type and merge neighboring compatible regions.
 */
static void __init_memblock memblock_merge_regions(struct memblock_type *type)
{
	int i = 0;

	/* cnt never goes below 1 */
	while (i < type->cnt - 1) {
		struct memblock_region *this = &type->regions[i];
		struct memblock_region *next = &type->regions[i + 1];

		if (this->base + this->size != next->base ||
		    memblock_get_region_node(this) !=
		    memblock_get_region_node(next)) {
			BUG_ON(this->base + this->size > next->base);
			i++;
			continue;
		}

		this->size += next->size;
		memmove(next, next + 1, (type->cnt - (i + 1)) * sizeof(*next));
		type->cnt--;
	}
}

/**
 * memblock_insert_region - insert new memblock region
 * @type: memblock type to insert into
 * @idx: index for the insertion point
 * @base: base address of the new region
 * @size: size of the new region
 *
 * Insert new memblock region [@base,@base+@size) into @type at @idx.
 * @type must already have extra room to accomodate the new region.
 */
static void __init_memblock memblock_insert_region(struct memblock_type *type,
						   int idx, phys_addr_t base,
						   phys_addr_t size, int nid)
{
	struct memblock_region *rgn = &type->regions[idx];

	BUG_ON(type->cnt >= type->max);
	memmove(rgn + 1, rgn, (type->cnt - idx) * sizeof(*rgn));
	rgn->base = base;
	rgn->size = size;
	memblock_set_region_node(rgn, nid);
	type->cnt++;
	type->total_size += size;
}

/**
 * memblock_add_region - add new memblock region
 * @type: memblock type to add new region into
 * @base: base address of the new region
 * @size: size of the new region
 * @nid: nid of the new region
 *
 * Add new memblock region [@base,@base+@size) into @type.  The new region
 * is allowed to overlap with existing ones - overlaps don't affect already
 * existing regions.  @type is guaranteed to be minimal (all neighbouring
 * compatible regions are merged) after the addition.
 *
 * RETURNS:
 * 0 on success, -errno on failure.
 */
static int __init_memblock memblock_add_region(struct memblock_type *type,
				phys_addr_t base, phys_addr_t size, int nid)
{
	bool insert = false;
	phys_addr_t obase = base;
	phys_addr_t end = base + memblock_cap_size(base, &size);
	int i, nr_new;

	if (!size)
		return 0;

	/* special case for empty array */
	if (type->regions[0].size == 0) {
		WARN_ON(type->cnt != 1 || type->total_size);
		type->regions[0].base = base;
		type->regions[0].size = size;