2 * Procedures for maintaining information about logical memory blocks.
4 * Peter Bergner, IBM Corp. June 2001.
5 * Copyright (C) 2001 Peter Bergner.
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License
9 * as published by the Free Software Foundation; either version
10 * 2 of the License, or (at your option) any later version.
13 #include <linux/kernel.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/bitops.h>
17 #include <linux/poison.h>
18 #include <linux/pfn.h>
19 #include <linux/debugfs.h>
20 #include <linux/seq_file.h>
21 #include <linux/memblock.h>
23 #include <asm/sections.h>
28 static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
29 static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
30 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
31 static struct memblock_region memblock_physmem_init_regions[INIT_PHYSMEM_REGIONS] __initdata_memblock;
34 struct memblock memblock __initdata_memblock = {
35 .memory.regions = memblock_memory_init_regions,
36 .memory.cnt = 1, /* empty dummy entry */
37 .memory.max = INIT_MEMBLOCK_REGIONS,
38 .memory.name = "memory",
40 .reserved.regions = memblock_reserved_init_regions,
41 .reserved.cnt = 1, /* empty dummy entry */
42 .reserved.max = INIT_MEMBLOCK_REGIONS,
43 .reserved.name = "reserved",
45 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
46 .physmem.regions = memblock_physmem_init_regions,
47 .physmem.cnt = 1, /* empty dummy entry */
48 .physmem.max = INIT_PHYSMEM_REGIONS,
49 .physmem.name = "physmem",
53 .current_limit = MEMBLOCK_ALLOC_ANYWHERE,
56 int memblock_debug __initdata_memblock;
57 #ifdef CONFIG_MOVABLE_NODE
58 bool movable_node_enabled __initdata_memblock = false;
60 static bool system_has_some_mirror __initdata_memblock = false;
61 static int memblock_can_resize __initdata_memblock;
62 static int memblock_memory_in_slab __initdata_memblock = 0;
63 static int memblock_reserved_in_slab __initdata_memblock = 0;
65 ulong __init_memblock choose_memblock_flags(void)
67 return system_has_some_mirror ? MEMBLOCK_MIRROR : MEMBLOCK_NONE;
70 /* adjust *@size so that (@base + *@size) doesn't overflow, return new size */
71 static inline phys_addr_t memblock_cap_size(phys_addr_t base, phys_addr_t *size)
73 return *size = min(*size, (phys_addr_t)ULLONG_MAX - base);
77 * Address comparison utilities
79 static unsigned long __init_memblock memblock_addrs_overlap(phys_addr_t base1, phys_addr_t size1,
80 phys_addr_t base2, phys_addr_t size2)
82 return ((base1 < (base2 + size2)) && (base2 < (base1 + size1)));
85 bool __init_memblock memblock_overlaps_region(struct memblock_type *type,
86 phys_addr_t base, phys_addr_t size)
90 for (i = 0; i < type->cnt; i++)
91 if (memblock_addrs_overlap(base, size, type->regions[i].base,
92 type->regions[i].size))
98 * __memblock_find_range_bottom_up - find free area utility in bottom-up
99 * @start: start of candidate range
100 * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
101 * @size: size of free area to find
102 * @align: alignment of free area to find
103 * @nid: nid of the free area to find, %NUMA_NO_NODE for any node
104 * @flags: pick from blocks based on memory attributes
106 * Utility called from memblock_find_in_range_node(), find free area bottom-up.
109 * Found address on success, 0 on failure.
111 static phys_addr_t __init_memblock
112 __memblock_find_range_bottom_up(phys_addr_t start, phys_addr_t end,
113 phys_addr_t size, phys_addr_t align, int nid,
116 phys_addr_t this_start, this_end, cand;
119 for_each_free_mem_range(i, nid, flags, &this_start, &this_end, NULL) {
120 this_start = clamp(this_start, start, end);
121 this_end = clamp(this_end, start, end);
123 cand = round_up(this_start, align);
124 if (cand < this_end && this_end - cand >= size)
132 * __memblock_find_range_top_down - find free area utility, in top-down
133 * @start: start of candidate range
134 * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
135 * @size: size of free area to find
136 * @align: alignment of free area to find
137 * @nid: nid of the free area to find, %NUMA_NO_NODE for any node
138 * @flags: pick from blocks based on memory attributes
140 * Utility called from memblock_find_in_range_node(), find free area top-down.
143 * Found address on success, 0 on failure.
145 static phys_addr_t __init_memblock
146 __memblock_find_range_top_down(phys_addr_t start, phys_addr_t end,
147 phys_addr_t size, phys_addr_t align, int nid,
150 phys_addr_t this_start, this_end, cand;
153 for_each_free_mem_range_reverse(i, nid, flags, &this_start, &this_end,
155 this_start = clamp(this_start, start, end);
156 this_end = clamp(this_end, start, end);
161 cand = round_down(this_end - size, align);
162 if (cand >= this_start)
170 * memblock_find_in_range_node - find free area in given range and node
171 * @size: size of free area to find
172 * @align: alignment of free area to find
173 * @start: start of candidate range
174 * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
175 * @nid: nid of the free area to find, %NUMA_NO_NODE for any node
176 * @flags: pick from blocks based on memory attributes
178 * Find @size free area aligned to @align in the specified range and node.
180 * When allocation direction is bottom-up, the @start should be greater
181 * than the end of the kernel image. Otherwise, it will be trimmed. The
182 * reason is that we want the bottom-up allocation just near the kernel
183 * image so it is highly likely that the allocated memory and the kernel
184 * will reside in the same node.
186 * If bottom-up allocation failed, will try to allocate memory top-down.
189 * Found address on success, 0 on failure.
191 phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t size,
192 phys_addr_t align, phys_addr_t start,
193 phys_addr_t end, int nid, ulong flags)
195 phys_addr_t kernel_end, ret;
198 if (end == MEMBLOCK_ALLOC_ACCESSIBLE)
199 end = memblock.current_limit;
201 /* avoid allocating the first page */
202 start = max_t(phys_addr_t, start, PAGE_SIZE);
203 end = max(start, end);
204 kernel_end = __pa_symbol(_end);
207 * try bottom-up allocation only when bottom-up mode
208 * is set and @end is above the kernel image.
210 if (memblock_bottom_up() && end > kernel_end) {
211 phys_addr_t bottom_up_start;
213 /* make sure we will allocate above the kernel */
214 bottom_up_start = max(start, kernel_end);
216 /* ok, try bottom-up allocation first */
217 ret = __memblock_find_range_bottom_up(bottom_up_start, end,
218 size, align, nid, flags);
223 * we always limit bottom-up allocation above the kernel,
224 * but top-down allocation doesn't have the limit, so
225 * retrying top-down allocation may succeed when bottom-up
228 * bottom-up allocation is expected to be fail very rarely,
229 * so we use WARN_ONCE() here to see the stack trace if
232 WARN_ONCE(1, "memblock: bottom-up allocation failed, memory hotunplug may be affected\n");
235 return __memblock_find_range_top_down(start, end, size, align, nid,
240 * memblock_find_in_range - find free area in given range
241 * @start: start of candidate range
242 * @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
243 * @size: size of free area to find
244 * @align: alignment of free area to find
246 * Find @size free area aligned to @align in the specified range.
249 * Found address on success, 0 on failure.
251 phys_addr_t __init_memblock memblock_find_in_range(phys_addr_t start,
252 phys_addr_t end, phys_addr_t size,
256 ulong flags = choose_memblock_flags();
259 ret = memblock_find_in_range_node(size, align, start, end,
260 NUMA_NO_NODE, flags);
262 if (!ret && (flags & MEMBLOCK_MIRROR)) {
263 pr_warn("Could not allocate %pap bytes of mirrored memory\n",
265 flags &= ~MEMBLOCK_MIRROR;
272 static void __init_memblock memblock_remove_region(struct memblock_type *type, unsigned long r)
274 type->total_size -= type->regions[r].size;
275 memmove(&type->regions[r], &type->regions[r + 1],
276 (type->cnt - (r + 1)) * sizeof(type->regions[r]));
279 /* Special case for empty arrays */
280 if (type->cnt == 0) {
281 WARN_ON(type->total_size != 0);
283 type->regions[0].base = 0;
284 type->regions[0].size = 0;
285 type->regions[0].flags = 0;
286 memblock_set_region_node(&type->regions[0], MAX_NUMNODES);
290 #ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
292 phys_addr_t __init_memblock get_allocated_memblock_reserved_regions_info(
295 if (memblock.reserved.regions == memblock_reserved_init_regions)
298 *addr = __pa(memblock.reserved.regions);
300 return PAGE_ALIGN(sizeof(struct memblock_region) *
301 memblock.reserved.max);
304 phys_addr_t __init_memblock get_allocated_memblock_memory_regions_info(
307 if (memblock.memory.regions == memblock_memory_init_regions)
310 *addr = __pa(memblock.memory.regions);
312 return PAGE_ALIGN(sizeof(struct memblock_region) *
313 memblock.memory.max);
319 * memblock_double_array - double the size of the memblock regions array
320 * @type: memblock type of the regions array being doubled
321 * @new_area_start: starting address of memory range to avoid overlap with
322 * @new_area_size: size of memory range to avoid overlap with
324 * Double the size of the @type regions array. If memblock is being used to
325 * allocate memory for a new reserved regions array and there is a previously
326 * allocated memory range [@new_area_start,@new_area_start+@new_area_size]
327 * waiting to be reserved, ensure the memory used by the new array does
331 * 0 on success, -1 on failure.
333 static int __init_memblock memblock_double_array(struct memblock_type *type,
334 phys_addr_t new_area_start,
335 phys_addr_t new_area_size)
337 struct memblock_region *new_array, *old_array;
338 phys_addr_t old_alloc_size, new_alloc_size;
339 phys_addr_t old_size, new_size, addr;
340 int use_slab = slab_is_available();
343 /* We don't allow resizing until we know about the reserved regions
344 * of memory that aren't suitable for allocation
346 if (!memblock_can_resize)
349 /* Calculate new doubled size */
350 old_size = type->max * sizeof(struct memblock_region);
351 new_size = old_size << 1;
353 * We need to allocated new one align to PAGE_SIZE,
354 * so we can free them completely later.
356 old_alloc_size = PAGE_ALIGN(old_size);
357 new_alloc_size = PAGE_ALIGN(new_size);
359 /* Retrieve the slab flag */
360 if (type == &memblock.memory)
361 in_slab = &memblock_memory_in_slab;
363 in_slab = &memblock_reserved_in_slab;
365 /* Try to find some space for it.
367 * WARNING: We assume that either slab_is_available() and we use it or
368 * we use MEMBLOCK for allocations. That means that this is unsafe to
369 * use when bootmem is currently active (unless bootmem itself is
370 * implemented on top of MEMBLOCK which isn't the case yet)
372 * This should however not be an issue for now, as we currently only
373 * call into MEMBLOCK while it's still active, or much later when slab
374 * is active for memory hotplug operations
377 new_array = kmalloc(new_size, GFP_KERNEL);
378 addr = new_array ? __pa(new_array) : 0;
380 /* only exclude range when trying to double reserved.regions */
381 if (type != &memblock.reserved)
382 new_area_start = new_area_size = 0;
384 addr = memblock_find_in_range(new_area_start + new_area_size,
385 memblock.current_limit,
386 new_alloc_size, PAGE_SIZE);
387 if (!addr && new_area_size)
388 addr = memblock_find_in_range(0,
389 min(new_area_start, memblock.current_limit),
390 new_alloc_size, PAGE_SIZE);
392 new_array = addr ? __va(addr) : NULL;
395 pr_err("memblock: Failed to double %s array from %ld to %ld entries !\n",
396 type->name, type->max, type->max * 2);
400 memblock_dbg("memblock: %s is doubled to %ld at [%#010llx-%#010llx]",
401 type->name, type->max * 2, (u64)addr,
402 (u64)addr + new_size - 1);
405 * Found space, we now need to move the array over before we add the
406 * reserved region since it may be our reserved array itself that is
409 memcpy(new_array, type->regions, old_size);
410 memset(new_array + type->max, 0, old_size);
411 old_array = type->regions;
412 type->regions = new_array;
415 /* Free old array. We needn't free it if the array is the static one */
418 else if (old_array != memblock_memory_init_regions &&
419 old_array != memblock_reserved_init_regions)
420 memblock_free(__pa(old_array), old_alloc_size);
423 * Reserve the new array if that comes from the memblock. Otherwise, we
427 BUG_ON(memblock_reserve(addr, new_alloc_size));
429 /* Update slab flag */
436 * memblock_merge_regions - merge neighboring compatible regions
437 * @type: memblock type to scan
439 * Scan @type and merge neighboring compatible regions.
441 static void __init_memblock memblock_merge_regions(struct memblock_type *type)
445 /* cnt never goes below 1 */
446 while (i < type->cnt - 1) {
447 struct memblock_region *this = &type->regions[i];
448 struct memblock_region *next = &type->regions[i + 1];
450 if (this->base + this->size != next->base ||
451 memblock_get_region_node(this) !=
452 memblock_get_region_node(next) ||
453 this->flags != next->flags) {
454 BUG_ON(this->base + this->size > next->base);
459 this->size += next->size;
460 /* move forward from next + 1, index of which is i + 2 */
461 memmove(next, next + 1, (type->cnt - (i + 2)) * sizeof(*next));
467 * memblock_insert_region - insert new memblock region
468 * @type: memblock type to insert into
469 * @idx: index for the insertion point
470 * @base: base address of the new region
471 * @size: size of the new region
472 * @nid: node id of the new region
473 * @flags: flags of the new region
475 * Insert new memblock region [@base,@base+@size) into @type at @idx.
476 * @type must already have extra room to accommodate the new region.
478 static void __init_memblock memblock_insert_region(struct memblock_type *type,
479 int idx, phys_addr_t base,
481 int nid, unsigned long flags)
483 struct memblock_region *rgn = &type->regions[idx];
485 BUG_ON(type->cnt >= type->max);
486 memmove(rgn + 1, rgn, (type->cnt - idx) * sizeof(*rgn));
490 memblock_set_region_node(rgn, nid);
492 type->total_size += size;
496 * memblock_add_range - add new memblock region
497 * @type: memblock type to add new region into
498 * @base: base address of the new region
499 * @size: size of the new region
500 * @nid: nid of the new region
501 * @flags: flags of the new region
503 * Add new memblock region [@base,@base+@size) into @type. The new region
504 * is allowed to overlap with existing ones - overlaps don't affect already
505 * existing regions. @type is guaranteed to be minimal (all neighbouring
506 * compatible regions are merged) after the addition.
509 * 0 on success, -errno on failure.
511 int __init_memblock memblock_add_range(struct memblock_type *type,
512 phys_addr_t base, phys_addr_t size,
513 int nid, unsigned long flags)
516 phys_addr_t obase = base;
517 phys_addr_t end = base + memblock_cap_size(base, &size);
519 struct memblock_region *rgn;
524 /* special case for empty array */
525 if (type->regions[0].size == 0) {
526 WARN_ON(type->cnt != 1 || type->total_size);
527 type->regions[0].base = base;
528 type->regions[0].size = size;
529 type->regions[0].flags = flags;
530 memblock_set_region_node(&type->regions[0], nid);
531 type->total_size = size;
536 * The following is executed twice. Once with %false @insert and
537 * then with %true. The first counts the number of regions needed
538 * to accommodate the new area. The second actually inserts them.
543 for_each_memblock_type(type, rgn) {
544 phys_addr_t rbase = rgn->base;
545 phys_addr_t rend = rbase + rgn->size;
552 * @rgn overlaps. If it separates the lower part of new
553 * area, insert that portion.
556 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
557 WARN_ON(nid != memblock_get_region_node(rgn));
559 WARN_ON(flags != rgn->flags);
562 memblock_insert_region(type, idx++, base,
566 /* area below @rend is dealt with, forget about it */
567 base = min(rend, end);
570 /* insert the remaining portion */
574 memblock_insert_region(type, idx, base, end - base,
582 * If this was the first round, resize array and repeat for actual
583 * insertions; otherwise, merge and return.
586 while (type->cnt + nr_new > type->max)
587 if (memblock_double_array(type, obase, size) < 0)
592 memblock_merge_regions(type);
597 int __init_memblock memblock_add_node(phys_addr_t base, phys_addr_t size,
600 return memblock_add_range(&memblock.memory, base, size, nid, 0);
603 int __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
605 phys_addr_t end = base + size - 1;
607 memblock_dbg("memblock_add: [%pa-%pa] %pF\n",
608 &base, &end, (void *)_RET_IP_);
610 return memblock_add_range(&memblock.memory, base, size, MAX_NUMNODES, 0);
614 * memblock_isolate_range - isolate given range into disjoint memblocks
615 * @type: memblock type to isolate range for
616 * @base: base of range to isolate
617 * @size: size of range to isolate
618 * @start_rgn: out parameter for the start of isolated region
619 * @end_rgn: out parameter for the end of isolated region
621 * Walk @type and ensure that regions don't cross the boundaries defined by
622 * [@base,@base+@size). Crossing regions are split at the boundaries,
623 * which may create at most two more regions. The index of the first
624 * region inside the range is returned in *@start_rgn and end in *@end_rgn.
627 * 0 on success, -errno on failure.
629 static int __init_memblock memblock_isolate_range(struct memblock_type *type,
630 phys_addr_t base, phys_addr_t size,
631 int *start_rgn, int *end_rgn)
633 phys_addr_t end = base + memblock_cap_size(base, &size);
635 struct memblock_region *rgn;
637 *start_rgn = *end_rgn = 0;
642 /* we'll create at most two more regions */
643 while (type->cnt + 2 > type->max)
644 if (memblock_double_array(type, base, size) < 0)
647 for_each_memblock_type(type, rgn) {
648 phys_addr_t rbase = rgn->base;
649 phys_addr_t rend = rbase + rgn->size;
658 * @rgn intersects from below. Split and continue
659 * to process the next region - the new top half.
662 rgn->size -= base - rbase;
663 type->total_size -= base - rbase;
664 memblock_insert_region(type, idx, rbase, base - rbase,
665 memblock_get_region_node(rgn),
667 } else if (rend > end) {
669 * @rgn intersects from above. Split and redo the
670 * current region - the new bottom half.
673 rgn->size -= end - rbase;
674 type->total_size -= end - rbase;
675 memblock_insert_region(type, idx--, rbase, end - rbase,
676 memblock_get_region_node(rgn),
679 /* @rgn is fully contained, record it */
689 static int __init_memblock memblock_remove_range(struct memblock_type *type,
690 phys_addr_t base, phys_addr_t size)
692 int start_rgn, end_rgn;
695 ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
699 for (i = end_rgn - 1; i >= start_rgn; i--)
700 memblock_remove_region(type, i);
704 int __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size)
706 return memblock_remove_range(&memblock.memory, base, size);
710 int __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
712 phys_addr_t end = base + size - 1;
714 memblock_dbg(" memblock_free: [%pa-%pa] %pF\n",
715 &base, &end, (void *)_RET_IP_);
717 kmemleak_free_part_phys(base, size);
718 return memblock_remove_range(&memblock.reserved, base, size);
721 int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
723 phys_addr_t end = base + size - 1;
725 memblock_dbg("memblock_reserve: [%pa-%pa] %pF\n",
726 &base, &end, (void *)_RET_IP_);
728 return memblock_add_range(&memblock.reserved, base, size, MAX_NUMNODES, 0);
733 * This function isolates region [@base, @base + @size), and sets/clears flag
735 * Return 0 on success, -errno on failure.
737 static int __init_memblock memblock_setclr_flag(phys_addr_t base,
738 phys_addr_t size, int set, int flag)
740 struct memblock_type *type = &memblock.memory;
741 int i, ret, start_rgn, end_rgn;
743 ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
747 for (i = start_rgn; i < end_rgn; i++)
749 memblock_set_region_flags(&type->regions[i], flag);
751 memblock_clear_region_flags(&type->regions[i], flag);
753 memblock_merge_regions(type);
758 * memblock_mark_hotplug - Mark hotpluggable memory with flag MEMBLOCK_HOTPLUG.
759 * @base: the base phys addr of the region
760 * @size: the size of the region
762 * Return 0 on success, -errno on failure.
764 int __init_memblock memblock_mark_hotplug(phys_addr_t base, phys_addr_t size)
766 return memblock_setclr_flag(base, size, 1, MEMBLOCK_HOTPLUG);
770 * memblock_clear_hotplug - Clear flag MEMBLOCK_HOTPLUG for a specified region.
771 * @base: the base phys addr of the region
772 * @size: the size of the region
774 * Return 0 on success, -errno on failure.
776 int __init_memblock memblock_clear_hotplug(phys_addr_t base, phys_addr_t size)
778 return memblock_setclr_flag(base, size, 0, MEMBLOCK_HOTPLUG);
782 * memblock_mark_mirror - Mark mirrored memory with flag MEMBLOCK_MIRROR.
783 * @base: the base phys addr of the region
784 * @size: the size of the region
786 * Return 0 on success, -errno on failure.
788 int __init_memblock memblock_mark_mirror(phys_addr_t base, phys_addr_t size)
790 system_has_some_mirror = true;
792 return memblock_setclr_flag(base, size, 1, MEMBLOCK_MIRROR);
796 * memblock_mark_nomap - Mark a memory region with flag MEMBLOCK_NOMAP.
797 * @base: the base phys addr of the region
798 * @size: the size of the region
800 * Return 0 on success, -errno on failure.
802 int __init_memblock memblock_mark_nomap(phys_addr_t base, phys_addr_t size)
804 return memblock_setclr_flag(base, size, 1, MEMBLOCK_NOMAP);
808 * memblock_clear_nomap - Clear flag MEMBLOCK_NOMAP for a specified region.
809 * @base: the base phys addr of the region
810 * @size: the size of the region
812 * Return 0 on success, -errno on failure.
814 int __init_memblock memblock_clear_nomap(phys_addr_t base, phys_addr_t size)
816 return memblock_setclr_flag(base, size, 0, MEMBLOCK_NOMAP);
820 * __next_reserved_mem_region - next function for for_each_reserved_region()
821 * @idx: pointer to u64 loop variable
822 * @out_start: ptr to phys_addr_t for start address of the region, can be %NULL
823 * @out_end: ptr to phys_addr_t for end address of the region, can be %NULL
825 * Iterate over all reserved memory regions.
827 void __init_memblock __next_reserved_mem_region(u64 *idx,
828 phys_addr_t *out_start,
829 phys_addr_t *out_end)
831 struct memblock_type *type = &memblock.reserved;
833 if (*idx < type->cnt) {
834 struct memblock_region *r = &type->regions[*idx];
835 phys_addr_t base = r->base;
836 phys_addr_t size = r->size;
841 *out_end = base + size - 1;
847 /* signal end of iteration */
852 * __next__mem_range - next function for for_each_free_mem_range() etc.
853 * @idx: pointer to u64 loop variable
854 * @nid: node selector, %NUMA_NO_NODE for all nodes
855 * @flags: pick from blocks based on memory attributes
856 * @type_a: pointer to memblock_type from where the range is taken
857 * @type_b: pointer to memblock_type which excludes memory from being taken
858 * @out_start: ptr to phys_addr_t for start address of the range, can be %NULL
859 * @out_end: ptr to phys_addr_t for end address of the range, can be %NULL
860 * @out_nid: ptr to int for nid of the range, can be %NULL
862 * Find the first area from *@idx which matches @nid, fill the out
863 * parameters, and update *@idx for the next iteration. The lower 32bit of
864 * *@idx contains index into type_a and the upper 32bit indexes the
865 * areas before each region in type_b. For example, if type_b regions
866 * look like the following,
868 * 0:[0-16), 1:[32-48), 2:[128-130)
870 * The upper 32bit indexes the following regions.
872 * 0:[0-0), 1:[16-32), 2:[48-128), 3:[130-MAX)
874 * As both region arrays are sorted, the function advances the two indices
875 * in lockstep and returns each intersection.
877 void __init_memblock __next_mem_range(u64 *idx, int nid, ulong flags,
878 struct memblock_type *type_a,
879 struct memblock_type *type_b,
880 phys_addr_t *out_start,
881 phys_addr_t *out_end, int *out_nid)
883 int idx_a = *idx & 0xffffffff;
884 int idx_b = *idx >> 32;
886 if (WARN_ONCE(nid == MAX_NUMNODES,
887 "Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
890 for (; idx_a < type_a->cnt; idx_a++) {
891 struct memblock_region *m = &type_a->regions[idx_a];
893 phys_addr_t m_start = m->base;
894 phys_addr_t m_end = m->base + m->size;
895 int m_nid = memblock_get_region_node(m);
897 /* only memory regions are associated with nodes, check it */
898 if (nid != NUMA_NO_NODE && nid != m_nid)
901 /* skip hotpluggable memory regions if needed */
902 if (movable_node_is_enabled() && memblock_is_hotpluggable(m))
905 /* if we want mirror memory skip non-mirror memory regions */
906 if ((flags & MEMBLOCK_MIRROR) && !memblock_is_mirror(m))
909 /* skip nomap memory unless we were asked for it explicitly */
910 if (!(flags & MEMBLOCK_NOMAP) && memblock_is_nomap(m))
915 *out_start = m_start;
921 *idx = (u32)idx_a | (u64)idx_b << 32;
925 /* scan areas before each reservation */
926 for (; idx_b < type_b->cnt + 1; idx_b++) {
927 struct memblock_region *r;
931 r = &type_b->regions[idx_b];
932 r_start = idx_b ? r[-1].base + r[-1].size : 0;
933 r_end = idx_b < type_b->cnt ?
934 r->base : ULLONG_MAX;
937 * if idx_b advanced past idx_a,
938 * break out to advance idx_a
940 if (r_start >= m_end)
942 /* if the two regions intersect, we're done */
943 if (m_start < r_end) {
946 max(m_start, r_start);
948 *out_end = min(m_end, r_end);
952 * The region which ends first is
953 * advanced for the next iteration.
959 *idx = (u32)idx_a | (u64)idx_b << 32;
965 /* signal end of iteration */
970 * __next_mem_range_rev - generic next function for for_each_*_range_rev()
972 * Finds the next range from type_a which is not marked as unsuitable
975 * @idx: pointer to u64 loop variable
976 * @nid: node selector, %NUMA_NO_NODE for all nodes
977 * @flags: pick from blocks based on memory attributes
978 * @type_a: pointer to memblock_type from where the range is taken
979 * @type_b: pointer to memblock_type which excludes memory from being taken
980 * @out_start: ptr to phys_addr_t for start address of the range, can be %NULL
981 * @out_end: ptr to phys_addr_t for end address of the range, can be %NULL
982 * @out_nid: ptr to int for nid of the range, can be %NULL
984 * Reverse of __next_mem_range().
986 void __init_memblock __next_mem_range_rev(u64 *idx, int nid, ulong flags,
987 struct memblock_type *type_a,
988 struct memblock_type *type_b,
989 phys_addr_t *out_start,
990 phys_addr_t *out_end, int *out_nid)
992 int idx_a = *idx & 0xffffffff;
993 int idx_b = *idx >> 32;
995 if (WARN_ONCE(nid == MAX_NUMNODES, "Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
998 if (*idx == (u64)ULLONG_MAX) {
999 idx_a = type_a->cnt - 1;
1001 idx_b = type_b->cnt;
1006 for (; idx_a >= 0; idx_a--) {
1007 struct memblock_region *m = &type_a->regions[idx_a];
1009 phys_addr_t m_start = m->base;
1010 phys_addr_t m_end = m->base + m->size;
1011 int m_nid = memblock_get_region_node(m);
1013 /* only memory regions are associated with nodes, check it */
1014 if (nid != NUMA_NO_NODE && nid != m_nid)
1017 /* skip hotpluggable memory regions if needed */
1018 if (movable_node_is_enabled() && memblock_is_hotpluggable(m))
1021 /* if we want mirror memory skip non-mirror memory regions */
1022 if ((flags & MEMBLOCK_MIRROR) && !memblock_is_mirror(m))
1025 /* skip nomap memory unless we were asked for it explicitly */
1026 if (!(flags & MEMBLOCK_NOMAP) && memblock_is_nomap(m))
1031 *out_start = m_start;
1037 *idx = (u32)idx_a | (u64)idx_b << 32;
1041 /* scan areas before each reservation */
1042 for (; idx_b >= 0; idx_b--) {
1043 struct memblock_region *r;
1044 phys_addr_t r_start;
1047 r = &type_b->regions[idx_b];
1048 r_start = idx_b ? r[-1].base + r[-1].size : 0;
1049 r_end = idx_b < type_b->cnt ?
1050 r->base : ULLONG_MAX;
1052 * if idx_b advanced past idx_a,
1053 * break out to advance idx_a
1056 if (r_end <= m_start)
1058 /* if the two regions intersect, we're done */
1059 if (m_end > r_start) {
1061 *out_start = max(m_start, r_start);
1063 *out_end = min(m_end, r_end);
1066 if (m_start >= r_start)
1070 *idx = (u32)idx_a | (u64)idx_b << 32;
1075 /* signal end of iteration */
1079 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1081 * Common iterator interface used to define for_each_mem_range().
1083 void __init_memblock __next_mem_pfn_range(int *idx, int nid,
1084 unsigned long *out_start_pfn,
1085 unsigned long *out_end_pfn, int *out_nid)
1087 struct memblock_type *type = &memblock.memory;
1088 struct memblock_region *r;
1090 while (++*idx < type->cnt) {
1091 r = &type->regions[*idx];
1093 if (PFN_UP(r->base) >= PFN_DOWN(r->base + r->size))
1095 if (nid == MAX_NUMNODES || nid == r->nid)
1098 if (*idx >= type->cnt) {
1104 *out_start_pfn = PFN_UP(r->base);
1106 *out_end_pfn = PFN_DOWN(r->base + r->size);
1111 unsigned long __init_memblock memblock_next_valid_pfn(unsigned long pfn,
1112 unsigned long max_pfn)
1114 struct memblock_type *type = &memblock.memory;
1115 unsigned int right = type->cnt;
1116 unsigned int mid, left = 0;
1117 phys_addr_t addr = PFN_PHYS(pfn + 1);
1120 mid = (right + left) / 2;
1122 if (addr < type->regions[mid].base)
1124 else if (addr >= (type->regions[mid].base +
1125 type->regions[mid].size))
1128 /* addr is within the region, so pfn + 1 is valid */
1129 return min(pfn + 1, max_pfn);
1131 } while (left < right);
1133 if (right == type->cnt)
1136 return min(PHYS_PFN(type->regions[right].base), max_pfn);
1140 * memblock_set_node - set node ID on memblock regions
1141 * @base: base of area to set node ID for
1142 * @size: size of area to set node ID for
1143 * @type: memblock type to set node ID for
1144 * @nid: node ID to set
1146 * Set the nid of memblock @type regions in [@base,@base+@size) to @nid.
1147 * Regions which cross the area boundaries are split as necessary.
1150 * 0 on success, -errno on failure.
1152 int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size,
1153 struct memblock_type *type, int nid)
1155 int start_rgn, end_rgn;
1158 ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
1162 for (i = start_rgn; i < end_rgn; i++)
1163 memblock_set_region_node(&type->regions[i], nid);
1165 memblock_merge_regions(type);
1168 #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
1170 static phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size,
1171 phys_addr_t align, phys_addr_t start,
1172 phys_addr_t end, int nid, ulong flags)
1177 align = SMP_CACHE_BYTES;
1179 found = memblock_find_in_range_node(size, align, start, end, nid,
1181 if (found && !memblock_reserve(found, size)) {
1183 * The min_count is set to 0 so that memblock allocations are
1184 * never reported as leaks.
1186 kmemleak_alloc_phys(found, size, 0, 0);
1192 phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align,
1193 phys_addr_t start, phys_addr_t end,
1196 return memblock_alloc_range_nid(size, align, start, end, NUMA_NO_NODE,
1200 static phys_addr_t __init memblock_alloc_base_nid(phys_addr_t size,
1201 phys_addr_t align, phys_addr_t max_addr,
1202 int nid, ulong flags)
1204 return memblock_alloc_range_nid(size, align, 0, max_addr, nid, flags);
1207 phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
1209 ulong flags = choose_memblock_flags();
1213 ret = memblock_alloc_base_nid(size, align, MEMBLOCK_ALLOC_ACCESSIBLE,
1216 if (!ret && (flags & MEMBLOCK_MIRROR)) {
1217 flags &= ~MEMBLOCK_MIRROR;
1223 phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
1225 return memblock_alloc_base_nid(size, align, max_addr, NUMA_NO_NODE,
1229 phys_addr_t __init memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
1233 alloc = __memblock_alloc_base(size, align, max_addr);
1236 panic("ERROR: Failed to allocate %pa bytes below %pa.\n",
1242 phys_addr_t __init memblock_alloc(phys_addr_t size, phys_addr_t align)
1244 return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
1247 phys_addr_t __init memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid)
1249 phys_addr_t res = memblock_alloc_nid(size, align, nid);
1253 return memblock_alloc_base(size, align, MEMBLOCK_ALLOC_ACCESSIBLE);
1257 * memblock_virt_alloc_internal - allocate boot memory block
1258 * @size: size of memory block to be allocated in bytes
1259 * @align: alignment of the region and block's size
1260 * @min_addr: the lower bound of the memory region to allocate (phys address)
1261 * @max_addr: the upper bound of the memory region to allocate (phys address)
1262 * @nid: nid of the free area to find, %NUMA_NO_NODE for any node
1264 * The @min_addr limit is dropped if it can not be satisfied and the allocation
1265 * will fall back to memory below @min_addr. Also, allocation may fall back
1266 * to any node in the system if the specified node can not
1267 * hold the requested memory.
1269 * The allocation is performed from memory region limited by
1270 * memblock.current_limit if @max_addr == %BOOTMEM_ALLOC_ACCESSIBLE.
1272 * The memory block is aligned on SMP_CACHE_BYTES if @align == 0.
1274 * The phys address of allocated boot memory block is converted to virtual and
1275 * allocated memory is reset to 0.
1277 * In addition, function sets the min_count to 0 using kmemleak_alloc for
1278 * allocated boot memory block, so that it is never reported as leaks.
1281 * Virtual address of allocated memory block on success, NULL on failure.
1283 static void * __init memblock_virt_alloc_internal(
1284 phys_addr_t size, phys_addr_t align,
1285 phys_addr_t min_addr, phys_addr_t max_addr,
1290 ulong flags = choose_memblock_flags();
1292 if (WARN_ONCE(nid == MAX_NUMNODES, "Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
1296 * Detect any accidental use of these APIs after slab is ready, as at
1297 * this moment memblock may be deinitialized already and its
1298 * internal data may be destroyed (after execution of free_all_bootmem)
1300 if (WARN_ON_ONCE(slab_is_available()))
1301 return kzalloc_node(size, GFP_NOWAIT, nid);
1304 align = SMP_CACHE_BYTES;
1306 if (max_addr > memblock.current_limit)
1307 max_addr = memblock.current_limit;
1309 alloc = memblock_find_in_range_node(size, align, min_addr, max_addr,
1311 if (alloc && !memblock_reserve(alloc, size))
1314 if (nid != NUMA_NO_NODE) {
1315 alloc = memblock_find_in_range_node(size, align, min_addr,
1316 max_addr, NUMA_NO_NODE,
1318 if (alloc && !memblock_reserve(alloc, size))
1327 if (flags & MEMBLOCK_MIRROR) {
1328 flags &= ~MEMBLOCK_MIRROR;
1329 pr_warn("Could not allocate %pap bytes of mirrored memory\n",
1336 ptr = phys_to_virt(alloc);
1337 memset(ptr, 0, size);
1340 * The min_count is set to 0 so that bootmem allocated blocks
1341 * are never reported as leaks. This is because many of these blocks
1342 * are only referred via the physical address which is not
1343 * looked up by kmemleak.
1345 kmemleak_alloc(ptr, size, 0, 0);
1351 * memblock_virt_alloc_try_nid_nopanic - allocate boot memory block
1352 * @size: size of memory block to be allocated in bytes
1353 * @align: alignment of the region and block's size
1354 * @min_addr: the lower bound of the memory region from where the allocation
1355 * is preferred (phys address)
1356 * @max_addr: the upper bound of the memory region from where the allocation
1357 * is preferred (phys address), or %BOOTMEM_ALLOC_ACCESSIBLE to
1358 * allocate only from memory limited by memblock.current_limit value
1359 * @nid: nid of the free area to find, %NUMA_NO_NODE for any node
1361 * Public version of _memblock_virt_alloc_try_nid_nopanic() which provides
1362 * additional debug information (including caller info), if enabled.
1365 * Virtual address of allocated memory block on success, NULL on failure.
1367 void * __init memblock_virt_alloc_try_nid_nopanic(
1368 phys_addr_t size, phys_addr_t align,
1369 phys_addr_t min_addr, phys_addr_t max_addr,
1372 memblock_dbg("%s: %llu bytes align=0x%llx nid=%d from=0x%llx max_addr=0x%llx %pF\n",
1373 __func__, (u64)size, (u64)align, nid, (u64)min_addr,
1374 (u64)max_addr, (void *)_RET_IP_);
1375 return memblock_virt_alloc_internal(size, align, min_addr,
1380 * memblock_virt_alloc_try_nid - allocate boot memory block with panicking
1381 * @size: size of memory block to be allocated in bytes
1382 * @align: alignment of the region and block's size
1383 * @min_addr: the lower bound of the memory region from where the allocation
1384 * is preferred (phys address)
1385 * @max_addr: the upper bound of the memory region from where the allocation
1386 * is preferred (phys address), or %BOOTMEM_ALLOC_ACCESSIBLE to
1387 * allocate only from memory limited by memblock.current_limit value
1388 * @nid: nid of the free area to find, %NUMA_NO_NODE for any node
1390 * Public panicking version of _memblock_virt_alloc_try_nid_nopanic()
1391 * which provides debug information (including caller info), if enabled,
1392 * and panics if the request can not be satisfied.
1395 * Virtual address of allocated memory block on success, NULL on failure.
1397 void * __init memblock_virt_alloc_try_nid(
1398 phys_addr_t size, phys_addr_t align,
1399 phys_addr_t min_addr, phys_addr_t max_addr,
1404 memblock_dbg("%s: %llu bytes align=0x%llx nid=%d from=0x%llx max_addr=0x%llx %pF\n",
1405 __func__, (u64)size, (u64)align, nid, (u64)min_addr,
1406 (u64)max_addr, (void *)_RET_IP_);
1407 ptr = memblock_virt_alloc_internal(size, align,
1408 min_addr, max_addr, nid);
1412 panic("%s: Failed to allocate %llu bytes align=0x%llx nid=%d from=0x%llx max_addr=0x%llx\n",
1413 __func__, (u64)size, (u64)align, nid, (u64)min_addr,
1419 * __memblock_free_early - free boot memory block
1420 * @base: phys starting address of the boot memory block
1421 * @size: size of the boot memory block in bytes
1423 * Free boot memory block previously allocated by memblock_virt_alloc_xx() API.
1424 * The freeing memory will not be released to the buddy allocator.
1426 void __init __memblock_free_early(phys_addr_t base, phys_addr_t size)
1428 memblock_dbg("%s: [%#016llx-%#016llx] %pF\n",
1429 __func__, (u64)base, (u64)base + size - 1,
1431 kmemleak_free_part_phys(base, size);
1432 memblock_remove_range(&memblock.reserved, base, size);
1436 * __memblock_free_late - free bootmem block pages directly to buddy allocator
1437 * @addr: phys starting address of the boot memory block
1438 * @size: size of the boot memory block in bytes
1440 * This is only useful when the bootmem allocator has already been torn
1441 * down, but we are still initializing the system. Pages are released directly
1442 * to the buddy allocator, no bootmem metadata is updated because it is gone.
1444 void __init __memblock_free_late(phys_addr_t base, phys_addr_t size)
1448 memblock_dbg("%s: [%#016llx-%#016llx] %pF\n",
1449 __func__, (u64)base, (u64)base + size - 1,
1451 kmemleak_free_part_phys(base, size);
1452 cursor = PFN_UP(base);
1453 end = PFN_DOWN(base + size);
1455 for (; cursor < end; cursor++) {
1456 __free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
1462 * Remaining API functions
1465 phys_addr_t __init_memblock memblock_phys_mem_size(void)
1467 return memblock.memory.total_size;
1470 phys_addr_t __init_memblock memblock_reserved_size(void)
1472 return memblock.reserved.total_size;
1475 phys_addr_t __init memblock_mem_size(unsigned long limit_pfn)
1477 unsigned long pages = 0;
1478 struct memblock_region *r;
1479 unsigned long start_pfn, end_pfn;
1481 for_each_memblock(memory, r) {
1482 start_pfn = memblock_region_memory_base_pfn(r);
1483 end_pfn = memblock_region_memory_end_pfn(r);
1484 start_pfn = min_t(unsigned long, start_pfn, limit_pfn);
1485 end_pfn = min_t(unsigned long, end_pfn, limit_pfn);
1486 pages += end_pfn - start_pfn;
1489 return PFN_PHYS(pages);
1492 /* lowest address */
1493 phys_addr_t __init_memblock memblock_start_of_DRAM(void)
1495 return memblock.memory.regions[0].base;
1498 phys_addr_t __init_memblock memblock_end_of_DRAM(void)
1500 int idx = memblock.memory.cnt - 1;
1502 return (memblock.memory.regions[idx].base + memblock.memory.regions[idx].size);
1505 static phys_addr_t __init_memblock __find_max_addr(phys_addr_t limit)
1507 phys_addr_t max_addr = (phys_addr_t)ULLONG_MAX;
1508 struct memblock_region *r;
1511 * translate the memory @limit size into the max address within one of
1512 * the memory memblock regions, if the @limit exceeds the total size
1513 * of those regions, max_addr will keep original value ULLONG_MAX
1515 for_each_memblock(memory, r) {
1516 if (limit <= r->size) {
1517 max_addr = r->base + limit;
1526 void __init memblock_enforce_memory_limit(phys_addr_t limit)
1528 phys_addr_t max_addr = (phys_addr_t)ULLONG_MAX;
1533 max_addr = __find_max_addr(limit);
1535 /* @limit exceeds the total size of the memory, do nothing */
1536 if (max_addr == (phys_addr_t)ULLONG_MAX)
1539 /* truncate both memory and reserved regions */
1540 memblock_remove_range(&memblock.memory, max_addr,
1541 (phys_addr_t)ULLONG_MAX);
1542 memblock_remove_range(&memblock.reserved, max_addr,
1543 (phys_addr_t)ULLONG_MAX);
1546 void __init memblock_cap_memory_range(phys_addr_t base, phys_addr_t size)
1548 int start_rgn, end_rgn;
1554 ret = memblock_isolate_range(&memblock.memory, base, size,
1555 &start_rgn, &end_rgn);
1559 /* remove all the MAP regions */
1560 for (i = memblock.memory.cnt - 1; i >= end_rgn; i--)
1561 if (!memblock_is_nomap(&memblock.memory.regions[i]))
1562 memblock_remove_region(&memblock.memory, i);
1564 for (i = start_rgn - 1; i >= 0; i--)
1565 if (!memblock_is_nomap(&memblock.memory.regions[i]))
1566 memblock_remove_region(&memblock.memory, i);
1568 /* truncate the reserved regions */
1569 memblock_remove_range(&memblock.reserved, 0, base);
1570 memblock_remove_range(&memblock.reserved,
1571 base + size, (phys_addr_t)ULLONG_MAX);
1574 void __init memblock_mem_limit_remove_map(phys_addr_t limit)
1576 phys_addr_t max_addr;
1581 max_addr = __find_max_addr(limit);
1583 /* @limit exceeds the total size of the memory, do nothing */
1584 if (max_addr == (phys_addr_t)ULLONG_MAX)
1587 memblock_cap_memory_range(0, max_addr);
1590 static int __init_memblock memblock_search(struct memblock_type *type, phys_addr_t addr)
1592 unsigned int left = 0, right = type->cnt;
1595 unsigned int mid = (right + left) / 2;
1597 if (addr < type->regions[mid].base)
1599 else if (addr >= (type->regions[mid].base +
1600 type->regions[mid].size))
1604 } while (left < right);
1608 bool __init memblock_is_reserved(phys_addr_t addr)
1610 return memblock_search(&memblock.reserved, addr) != -1;
1613 bool __init_memblock memblock_is_memory(phys_addr_t addr)
1615 return memblock_search(&memblock.memory, addr) != -1;
1618 int __init_memblock memblock_is_map_memory(phys_addr_t addr)
1620 int i = memblock_search(&memblock.memory, addr);
1624 return !memblock_is_nomap(&memblock.memory.regions[i]);
1627 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1628 int __init_memblock memblock_search_pfn_nid(unsigned long pfn,
1629 unsigned long *start_pfn, unsigned long *end_pfn)
1631 struct memblock_type *type = &memblock.memory;
1632 int mid = memblock_search(type, PFN_PHYS(pfn));
1637 *start_pfn = PFN_DOWN(type->regions[mid].base);
1638 *end_pfn = PFN_DOWN(type->regions[mid].base + type->regions[mid].size);
1640 return type->regions[mid].nid;
1645 * memblock_is_region_memory - check if a region is a subset of memory
1646 * @base: base of region to check
1647 * @size: size of region to check
1649 * Check if the region [@base, @base+@size) is a subset of a memory block.
1652 * 0 if false, non-zero if true
1654 int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
1656 int idx = memblock_search(&memblock.memory, base);
1657 phys_addr_t end = base + memblock_cap_size(base, &size);
1661 return (memblock.memory.regions[idx].base +
1662 memblock.memory.regions[idx].size) >= end;
1666 * memblock_is_region_reserved - check if a region intersects reserved memory
1667 * @base: base of region to check
1668 * @size: size of region to check
1670 * Check if the region [@base, @base+@size) intersects a reserved memory block.
1673 * True if they intersect, false if not.
1675 bool __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
1677 memblock_cap_size(base, &size);
1678 return memblock_overlaps_region(&memblock.reserved, base, size);
1681 void __init_memblock memblock_trim_memory(phys_addr_t align)
1683 phys_addr_t start, end, orig_start, orig_end;
1684 struct memblock_region *r;
1686 for_each_memblock(memory, r) {
1687 orig_start = r->base;
1688 orig_end = r->base + r->size;
1689 start = round_up(orig_start, align);
1690 end = round_down(orig_end, align);
1692 if (start == orig_start && end == orig_end)
1697 r->size = end - start;
1699 memblock_remove_region(&memblock.memory,
1700 r - memblock.memory.regions);
1706 void __init_memblock memblock_set_current_limit(phys_addr_t limit)
1708 memblock.current_limit = limit;
1711 phys_addr_t __init_memblock memblock_get_current_limit(void)
1713 return memblock.current_limit;
1716 static void __init_memblock memblock_dump(struct memblock_type *type)
1718 phys_addr_t base, end, size;
1719 unsigned long flags;
1721 struct memblock_region *rgn;
1723 pr_info(" %s.cnt = 0x%lx\n", type->name, type->cnt);
1725 for_each_memblock_type(type, rgn) {
1726 char nid_buf[32] = "";
1730 end = base + size - 1;
1732 #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
1733 if (memblock_get_region_node(rgn) != MAX_NUMNODES)
1734 snprintf(nid_buf, sizeof(nid_buf), " on node %d",
1735 memblock_get_region_node(rgn));
1737 pr_info(" %s[%#x]\t[%pa-%pa], %pa bytes%s flags: %#lx\n",
1738 type->name, idx, &base, &end, &size, nid_buf, flags);
1742 void __init_memblock __memblock_dump_all(void)
1744 pr_info("MEMBLOCK configuration:\n");
1745 pr_info(" memory size = %pa reserved size = %pa\n",
1746 &memblock.memory.total_size,
1747 &memblock.reserved.total_size);
1749 memblock_dump(&memblock.memory);
1750 memblock_dump(&memblock.reserved);
1751 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
1752 memblock_dump(&memblock.physmem);
1756 void __init memblock_allow_resize(void)
1758 memblock_can_resize = 1;
1761 static int __init early_memblock(char *p)
1763 if (p && strstr(p, "debug"))
1767 early_param("memblock", early_memblock);
1769 #if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_ARCH_DISCARD_MEMBLOCK)
1771 static int memblock_debug_show(struct seq_file *m, void *private)
1773 struct memblock_type *type = m->private;
1774 struct memblock_region *reg;
1778 for (i = 0; i < type->cnt; i++) {
1779 reg = &type->regions[i];
1780 end = reg->base + reg->size - 1;
1782 seq_printf(m, "%4d: ", i);
1783 seq_printf(m, "%pa..%pa\n", ®->base, &end);
1788 static int memblock_debug_open(struct inode *inode, struct file *file)
1790 return single_open(file, memblock_debug_show, inode->i_private);
1793 static const struct file_operations memblock_debug_fops = {
1794 .open = memblock_debug_open,
1796 .llseek = seq_lseek,
1797 .release = single_release,
1800 static int __init memblock_init_debugfs(void)
1802 struct dentry *root = debugfs_create_dir("memblock", NULL);
1805 debugfs_create_file("memory", S_IRUGO, root, &memblock.memory, &memblock_debug_fops);
1806 debugfs_create_file("reserved", S_IRUGO, root, &memblock.reserved, &memblock_debug_fops);
1807 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
1808 debugfs_create_file("physmem", S_IRUGO, root, &memblock.physmem, &memblock_debug_fops);
1813 __initcall(memblock_init_debugfs);
1815 #endif /* CONFIG_DEBUG_FS */