linux/mm/memblock.c
Michal Hocko 864b9a393d mm: consider memblock reservations for deferred memory initialization sizing
We have seen an early OOM killer invocation on ppc64 systems with
crashkernel=4096M:

	kthreadd invoked oom-killer: gfp_mask=0x16040c0(GFP_KERNEL|__GFP_COMP|__GFP_NOTRACK), nodemask=7, order=0, oom_score_adj=0
	kthreadd cpuset=/ mems_allowed=7
	CPU: 0 PID: 2 Comm: kthreadd Not tainted 4.4.68-1.gd7fe927-default #1
	Call Trace:
	  dump_stack+0xb0/0xf0 (unreliable)
	  dump_header+0xb0/0x258
	  out_of_memory+0x5f0/0x640
	  __alloc_pages_nodemask+0xa8c/0xc80
	  kmem_getpages+0x84/0x1a0
	  fallback_alloc+0x2a4/0x320
	  kmem_cache_alloc_node+0xc0/0x2e0
	  copy_process.isra.25+0x260/0x1b30
	  _do_fork+0x94/0x470
	  kernel_thread+0x48/0x60
	  kthreadd+0x264/0x330
	  ret_from_kernel_thread+0x5c/0xa4

	Mem-Info:
	active_anon:0 inactive_anon:0 isolated_anon:0
	 active_file:0 inactive_file:0 isolated_file:0
	 unevictable:0 dirty:0 writeback:0 unstable:0
	 slab_reclaimable:5 slab_unreclaimable:73
	 mapped:0 shmem:0 pagetables:0 bounce:0
	 free:0 free_pcp:0 free_cma:0
	Node 7 DMA free:0kB min:0kB low:0kB high:0kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:52428800kB managed:110016kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:320kB slab_unreclaimable:4672kB kernel_stack:1152kB pagetables:0kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
	lowmem_reserve[]: 0 0 0 0
	Node 7 DMA: 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 0*8192kB 0*16384kB = 0kB
	0 total pagecache pages
	0 pages in swap cache
	Swap cache stats: add 0, delete 0, find 0/0
	Free swap  = 0kB
	Total swap = 0kB
	819200 pages RAM
	0 pages HighMem/MovableOnly
	817481 pages reserved
	0 pages cma reserved
	0 pages hwpoisoned

the reason is that the managed memory is too low (only 110MB) while the
rest of the the 50GB is still waiting for the deferred intialization to
be done.  update_defer_init estimates the initial memoty to initialize
to 2GB at least but it doesn't consider any memory allocated in that
range.  In this particular case we've had

	Reserving 4096MB of memory at 128MB for crashkernel (System RAM: 51200MB)

so the low 2GB is mostly depleted.

Fix this by considering memblock allocations in the initial static
initialization estimation.  Move the max_initialise to
reset_deferred_meminit and implement a simple memblock_reserved_memory
helper which iterates all reserved blocks and sums the size of all that
start below the given address.  The cumulative size is than added on top
of the initial estimation.  This is still not ideal because
reset_deferred_meminit doesn't consider holes and so reservation might
be above the initial estimation whihch we ignore but let's make the
logic simpler until we really need to handle more complicated cases.

Fixes: 3a80a7fa79 ("mm: meminit: initialise a subset of struct pages if CONFIG_DEFERRED_STRUCT_PAGE_INIT is set")
Link: http://lkml.kernel.org/r/20170531104010.GI27783@dhcp22.suse.cz
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Tested-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: <stable@vger.kernel.org>	[4.2+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-06-02 15:07:38 -07:00

1839 lines
51 KiB
C

/*
* 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>
#include <asm/sections.h>
#include <linux/io.h>
#include "internal.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;
#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
static struct memblock_region memblock_physmem_init_regions[INIT_PHYSMEM_REGIONS] __initdata_memblock;
#endif
struct memblock memblock __initdata_memblock = {
.memory.regions = memblock_memory_init_regions,
.memory.cnt = 1, /* empty dummy entry */
.memory.max = INIT_MEMBLOCK_REGIONS,
.memory.name = "memory",
.reserved.regions = memblock_reserved_init_regions,
.reserved.cnt = 1, /* empty dummy entry */
.reserved.max = INIT_MEMBLOCK_REGIONS,
.reserved.name = "reserved",
#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
.physmem.regions = memblock_physmem_init_regions,
.physmem.cnt = 1, /* empty dummy entry */
.physmem.max = INIT_PHYSMEM_REGIONS,
.physmem.name = "physmem",
#endif
.bottom_up = false,
.current_limit = MEMBLOCK_ALLOC_ANYWHERE,
};
int memblock_debug __initdata_memblock;
#ifdef CONFIG_MOVABLE_NODE
bool movable_node_enabled __initdata_memblock = false;
#endif
static bool system_has_some_mirror __initdata_memblock = false;
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;
ulong __init_memblock choose_memblock_flags(void)
{
return system_has_some_mirror ? MEMBLOCK_MIRROR : MEMBLOCK_NONE;
}
/* 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)));
}
bool __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++)
if (memblock_addrs_overlap(base, size, type->regions[i].base,
type->regions[i].size))
break;
return i < type->cnt;
}
/*
* __memblock_find_range_bottom_up - find free area utility in bottom-up
* @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, %NUMA_NO_NODE for any node
* @flags: pick from blocks based on memory attributes
*
* Utility called from memblock_find_in_range_node(), find free area bottom-up.
*
* RETURNS:
* Found address on success, 0 on failure.
*/
static phys_addr_t __init_memblock
__memblock_find_range_bottom_up(phys_addr_t start, phys_addr_t end,
phys_addr_t size, phys_addr_t align, int nid,
ulong flags)
{
phys_addr_t this_start, this_end, cand;
u64 i;
for_each_free_mem_range(i, nid, flags, &this_start, &this_end, NULL) {
this_start = clamp(this_start, start, end);
this_end = clamp(this_end, start, end);
cand = round_up(this_start, align);
if (cand < this_end && this_end - cand >= size)
return cand;
}
return 0;
}
/**
* __memblock_find_range_top_down - find free area utility, in top-down
* @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, %NUMA_NO_NODE for any node
* @flags: pick from blocks based on memory attributes
*
* Utility called from memblock_find_in_range_node(), find free area top-down.
*
* RETURNS:
* Found address on success, 0 on failure.
*/
static phys_addr_t __init_memblock
__memblock_find_range_top_down(phys_addr_t start, phys_addr_t end,
phys_addr_t size, phys_addr_t align, int nid,
ulong flags)
{
phys_addr_t this_start, this_end, cand;
u64 i;
for_each_free_mem_range_reverse(i, nid, flags, &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_node - find free area in given range and node
* @size: size of free area to find
* @align: alignment of free area to find
* @start: start of candidate range
* @end: end of candidate range, can be %MEMBLOCK_ALLOC_{ANYWHERE|ACCESSIBLE}
* @nid: nid of the free area to find, %NUMA_NO_NODE for any node
* @flags: pick from blocks based on memory attributes
*
* Find @size free area aligned to @align in the specified range and node.
*
* When allocation direction is bottom-up, the @start should be greater
* than the end of the kernel image. Otherwise, it will be trimmed. The
* reason is that we want the bottom-up allocation just near the kernel
* image so it is highly likely that the allocated memory and the kernel
* will reside in the same node.
*
* If bottom-up allocation failed, will try to allocate memory top-down.
*
* RETURNS:
* Found address on success, 0 on failure.
*/
phys_addr_t __init_memblock memblock_find_in_range_node(phys_addr_t size,
phys_addr_t align, phys_addr_t start,
phys_addr_t end, int nid, ulong flags)
{
phys_addr_t kernel_end, ret;
/* 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);
kernel_end = __pa_symbol(_end);
/*
* try bottom-up allocation only when bottom-up mode
* is set and @end is above the kernel image.
*/
if (memblock_bottom_up() && end > kernel_end) {
phys_addr_t bottom_up_start;
/* make sure we will allocate above the kernel */
bottom_up_start = max(start, kernel_end);
/* ok, try bottom-up allocation first */
ret = __memblock_find_range_bottom_up(bottom_up_start, end,
size, align, nid, flags);
if (ret)
return ret;
/*
* we always limit bottom-up allocation above the kernel,
* but top-down allocation doesn't have the limit, so
* retrying top-down allocation may succeed when bottom-up
* allocation failed.
*
* bottom-up allocation is expected to be fail very rarely,
* so we use WARN_ONCE() here to see the stack trace if
* fail happens.
*/
WARN_ONCE(1, "memblock: bottom-up allocation failed, memory hotunplug may be affected\n");
}
return __memblock_find_range_top_down(start, end, size, align, nid,
flags);
}
/**
* 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)
{
phys_addr_t ret;
ulong flags = choose_memblock_flags();
again:
ret = memblock_find_in_range_node(size, align, start, end,
NUMA_NO_NODE, flags);
if (!ret && (flags & MEMBLOCK_MIRROR)) {
pr_warn("Could not allocate %pap bytes of mirrored memory\n",
&size);
flags &= ~MEMBLOCK_MIRROR;
goto again;
}
return ret;
}
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;
type->regions[0].flags = 0;
memblock_set_region_node(&type->regions[0], MAX_NUMNODES);
}
}
#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK
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);
}
phys_addr_t __init_memblock get_allocated_memblock_memory_regions_info(
phys_addr_t *addr)
{
if (memblock.memory.regions == memblock_memory_init_regions)
return 0;
*addr = __pa(memblock.memory.regions);
return PAGE_ALIGN(sizeof(struct memblock_region) *
memblock.memory.max);
}
#endif
/**
* 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",
type->name, type->max, type->max * 2);
return -1;
}
memblock_dbg("memblock: %s is doubled to %ld at [%#010llx-%#010llx]",
type->name, 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) ||
this->flags != next->flags) {
BUG_ON(this->base + this->size > next->base);
i++;
continue;
}
this->size += next->size;
/* move forward from next + 1, index of which is i + 2 */
memmove(next, next + 1, (type->cnt - (i + 2)) * 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
* @nid: node id of the new region
* @flags: flags of the new region
*
* Insert new memblock region [@base,@base+@size) into @type at @idx.
* @type must already have extra room to accommodate 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, unsigned long flags)
{
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;
rgn->flags = flags;
memblock_set_region_node(rgn, nid);
type->cnt++;
type->total_size += size;
}
/**
* memblock_add_range - 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
* @flags: flags 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.
*/
int __init_memblock memblock_add_range(struct memblock_type *type,
phys_addr_t base, phys_addr_t size,
int nid, unsigned long flags)
{
bool insert = false;
phys_addr_t obase = base;
phys_addr_t end = base + memblock_cap_size(base, &size);
int idx, nr_new;
struct memblock_region *rgn;
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;
type->regions[0].flags = flags;
memblock_set_region_node(&type->regions[0], nid);
type->total_size = size;
return 0;
}
repeat:
/*
* The following is executed twice. Once with %false @insert and
* then with %true. The first counts the number of regions needed
* to accommodate the new area. The second actually inserts them.
*/
base = obase;
nr_new = 0;
for_each_memblock_type(type, rgn) {
phys_addr_t rbase = rgn->base;
phys_addr_t rend = rbase + rgn->size;
if (rbase >= end)
break;
if (rend <= base)
continue;
/*
* @rgn overlaps. If it separates the lower part of new
* area, insert that portion.
*/
if (rbase > base) {
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
WARN_ON(nid != memblock_get_region_node(rgn));
#endif
WARN_ON(flags != rgn->flags);
nr_new++;
if (insert)
memblock_insert_region(type, idx++, base,
rbase - base, nid,
flags);
}
/* area below @rend is dealt with, forget about it */
base = min(rend, end);
}
/* insert the remaining portion */
if (base < end) {
nr_new++;
if (insert)
memblock_insert_region(type, idx, base, end - base,
nid, flags);
}
if (!nr_new)
return 0;
/*
* If this was the first round, resize array and repeat for actual
* insertions; otherwise, merge and return.
*/
if (!insert) {
while (type->cnt + nr_new > type->max)
if (memblock_double_array(type, obase, size) < 0)
return -ENOMEM;
insert = true;
goto repeat;
} else {
memblock_merge_regions(type);
return 0;
}
}
int __init_memblock memblock_add_node(phys_addr_t base, phys_addr_t size,
int nid)
{
return memblock_add_range(&memblock.memory, base, size, nid, 0);
}
int __init_memblock memblock_add(phys_addr_t base, phys_addr_t size)
{
phys_addr_t end = base + size - 1;
memblock_dbg("memblock_add: [%pa-%pa] %pF\n",
&base, &end, (void *)_RET_IP_);
return memblock_add_range(&memblock.memory, base, size, MAX_NUMNODES, 0);
}
/**
* memblock_isolate_range - isolate given range into disjoint memblocks
* @type: memblock type to isolate range for
* @base: base of range to isolate
* @size: size of range to isolate
* @start_rgn: out parameter for the start of isolated region
* @end_rgn: out parameter for the end of isolated region
*
* Walk @type and ensure that regions don't cross the boundaries defined by
* [@base,@base+@size). Crossing regions are split at the boundaries,
* which may create at most two more regions. The index of the first
* region inside the range is returned in *@start_rgn and end in *@end_rgn.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
static int __init_memblock memblock_isolate_range(struct memblock_type *type,
phys_addr_t base, phys_addr_t size,
int *start_rgn, int *end_rgn)
{
phys_addr_t end = base + memblock_cap_size(base, &size);
int idx;
struct memblock_region *rgn;
*start_rgn = *end_rgn = 0;
if (!size)
return 0;
/* we'll create at most two more regions */
while (type->cnt + 2 > type->max)
if (memblock_double_array(type, base, size) < 0)
return -ENOMEM;
for_each_memblock_type(type, rgn) {
phys_addr_t rbase = rgn->base;
phys_addr_t rend = rbase + rgn->size;
if (rbase >= end)
break;
if (rend <= base)
continue;
if (rbase < base) {
/*
* @rgn intersects from below. Split and continue
* to process the next region - the new top half.
*/
rgn->base = base;
rgn->size -= base - rbase;
type->total_size -= base - rbase;
memblock_insert_region(type, idx, rbase, base - rbase,
memblock_get_region_node(rgn),
rgn->flags);
} else if (rend > end) {
/*
* @rgn intersects from above. Split and redo the
* current region - the new bottom half.
*/
rgn->base = end;
rgn->size -= end - rbase;
type->total_size -= end - rbase;
memblock_insert_region(type, idx--, rbase, end - rbase,
memblock_get_region_node(rgn),
rgn->flags);
} else {
/* @rgn is fully contained, record it */
if (!*end_rgn)
*start_rgn = idx;
*end_rgn = idx + 1;
}
}
return 0;
}
static int __init_memblock memblock_remove_range(struct memblock_type *type,
phys_addr_t base, phys_addr_t size)
{
int start_rgn, end_rgn;
int i, ret;
ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
if (ret)
return ret;
for (i = end_rgn - 1; i >= start_rgn; i--)
memblock_remove_region(type, i);
return 0;
}
int __init_memblock memblock_remove(phys_addr_t base, phys_addr_t size)
{
return memblock_remove_range(&memblock.memory, base, size);
}
int __init_memblock memblock_free(phys_addr_t base, phys_addr_t size)
{
phys_addr_t end = base + size - 1;
memblock_dbg(" memblock_free: [%pa-%pa] %pF\n",
&base, &end, (void *)_RET_IP_);
kmemleak_free_part_phys(base, size);
return memblock_remove_range(&memblock.reserved, base, size);
}
int __init_memblock memblock_reserve(phys_addr_t base, phys_addr_t size)
{
phys_addr_t end = base + size - 1;
memblock_dbg("memblock_reserve: [%pa-%pa] %pF\n",
&base, &end, (void *)_RET_IP_);
return memblock_add_range(&memblock.reserved, base, size, MAX_NUMNODES, 0);
}
/**
*
* This function isolates region [@base, @base + @size), and sets/clears flag
*
* Return 0 on success, -errno on failure.
*/
static int __init_memblock memblock_setclr_flag(phys_addr_t base,
phys_addr_t size, int set, int flag)
{
struct memblock_type *type = &memblock.memory;
int i, ret, start_rgn, end_rgn;
ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
if (ret)
return ret;
for (i = start_rgn; i < end_rgn; i++)
if (set)
memblock_set_region_flags(&type->regions[i], flag);
else
memblock_clear_region_flags(&type->regions[i], flag);
memblock_merge_regions(type);
return 0;
}
/**
* memblock_mark_hotplug - Mark hotpluggable memory with flag MEMBLOCK_HOTPLUG.
* @base: the base phys addr of the region
* @size: the size of the region
*
* Return 0 on success, -errno on failure.
*/
int __init_memblock memblock_mark_hotplug(phys_addr_t base, phys_addr_t size)
{
return memblock_setclr_flag(base, size, 1, MEMBLOCK_HOTPLUG);
}
/**
* memblock_clear_hotplug - Clear flag MEMBLOCK_HOTPLUG for a specified region.
* @base: the base phys addr of the region
* @size: the size of the region
*
* Return 0 on success, -errno on failure.
*/
int __init_memblock memblock_clear_hotplug(phys_addr_t base, phys_addr_t size)
{
return memblock_setclr_flag(base, size, 0, MEMBLOCK_HOTPLUG);
}
/**
* memblock_mark_mirror - Mark mirrored memory with flag MEMBLOCK_MIRROR.
* @base: the base phys addr of the region
* @size: the size of the region
*
* Return 0 on success, -errno on failure.
*/
int __init_memblock memblock_mark_mirror(phys_addr_t base, phys_addr_t size)
{
system_has_some_mirror = true;
return memblock_setclr_flag(base, size, 1, MEMBLOCK_MIRROR);
}
/**
* memblock_mark_nomap - Mark a memory region with flag MEMBLOCK_NOMAP.
* @base: the base phys addr of the region
* @size: the size of the region
*
* Return 0 on success, -errno on failure.
*/
int __init_memblock memblock_mark_nomap(phys_addr_t base, phys_addr_t size)
{
return memblock_setclr_flag(base, size, 1, MEMBLOCK_NOMAP);
}
/**
* memblock_clear_nomap - Clear flag MEMBLOCK_NOMAP for a specified region.
* @base: the base phys addr of the region
* @size: the size of the region
*
* Return 0 on success, -errno on failure.
*/
int __init_memblock memblock_clear_nomap(phys_addr_t base, phys_addr_t size)
{
return memblock_setclr_flag(base, size, 0, MEMBLOCK_NOMAP);
}
/**
* __next_reserved_mem_region - next function for for_each_reserved_region()
* @idx: pointer to u64 loop variable
* @out_start: ptr to phys_addr_t for start address of the region, can be %NULL
* @out_end: ptr to phys_addr_t for end address of the region, can be %NULL
*
* Iterate over all reserved memory regions.
*/
void __init_memblock __next_reserved_mem_region(u64 *idx,
phys_addr_t *out_start,
phys_addr_t *out_end)
{
struct memblock_type *type = &memblock.reserved;
if (*idx < type->cnt) {
struct memblock_region *r = &type->regions[*idx];
phys_addr_t base = r->base;
phys_addr_t size = r->size;
if (out_start)
*out_start = base;
if (out_end)
*out_end = base + size - 1;
*idx += 1;
return;
}
/* signal end of iteration */
*idx = ULLONG_MAX;
}
/**
* __next__mem_range - next function for for_each_free_mem_range() etc.
* @idx: pointer to u64 loop variable
* @nid: node selector, %NUMA_NO_NODE for all nodes
* @flags: pick from blocks based on memory attributes
* @type_a: pointer to memblock_type from where the range is taken
* @type_b: pointer to memblock_type which excludes memory from being taken
* @out_start: ptr to phys_addr_t for start address of the range, can be %NULL
* @out_end: ptr to phys_addr_t for end address of the range, can be %NULL
* @out_nid: ptr to int for nid of the range, can be %NULL
*
* Find the first area from *@idx which matches @nid, fill the out
* parameters, and update *@idx for the next iteration. The lower 32bit of
* *@idx contains index into type_a and the upper 32bit indexes the
* areas before each region in type_b. For example, if type_b regions
* look like the following,
*
* 0:[0-16), 1:[32-48), 2:[128-130)
*
* The upper 32bit indexes the following regions.
*
* 0:[0-0), 1:[16-32), 2:[48-128), 3:[130-MAX)
*
* As both region arrays are sorted, the function advances the two indices
* in lockstep and returns each intersection.
*/
void __init_memblock __next_mem_range(u64 *idx, int nid, ulong flags,
struct memblock_type *type_a,
struct memblock_type *type_b,
phys_addr_t *out_start,
phys_addr_t *out_end, int *out_nid)
{
int idx_a = *idx & 0xffffffff;
int idx_b = *idx >> 32;
if (WARN_ONCE(nid == MAX_NUMNODES,
"Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
nid = NUMA_NO_NODE;
for (; idx_a < type_a->cnt; idx_a++) {
struct memblock_region *m = &type_a->regions[idx_a];
phys_addr_t m_start = m->base;
phys_addr_t m_end = m->base + m->size;
int m_nid = memblock_get_region_node(m);
/* only memory regions are associated with nodes, check it */
if (nid != NUMA_NO_NODE && nid != m_nid)
continue;
/* skip hotpluggable memory regions if needed */
if (movable_node_is_enabled() && memblock_is_hotpluggable(m))
continue;
/* if we want mirror memory skip non-mirror memory regions */
if ((flags & MEMBLOCK_MIRROR) && !memblock_is_mirror(m))
continue;
/* skip nomap memory unless we were asked for it explicitly */
if (!(flags & MEMBLOCK_NOMAP) && memblock_is_nomap(m))
continue;
if (!type_b) {
if (out_start)
*out_start = m_start;
if (out_end)
*out_end = m_end;
if (out_nid)
*out_nid = m_nid;
idx_a++;
*idx = (u32)idx_a | (u64)idx_b << 32;
return;
}
/* scan areas before each reservation */
for (; idx_b < type_b->cnt + 1; idx_b++) {
struct memblock_region *r;
phys_addr_t r_start;
phys_addr_t r_end;
r = &type_b->regions[idx_b];
r_start = idx_b ? r[-1].base + r[-1].size : 0;
r_end = idx_b < type_b->cnt ?
r->base : ULLONG_MAX;
/*
* if idx_b advanced past idx_a,
* break out to advance idx_a
*/
if (r_start >= m_end)
break;
/* if the two regions intersect, we're done */
if (m_start < r_end) {
if (out_start)
*out_start =
max(m_start, r_start);
if (out_end)
*out_end = min(m_end, r_end);
if (out_nid)
*out_nid = m_nid;
/*
* The region which ends first is
* advanced for the next iteration.
*/
if (m_end <= r_end)
idx_a++;
else
idx_b++;
*idx = (u32)idx_a | (u64)idx_b << 32;
return;
}
}
}
/* signal end of iteration */
*idx = ULLONG_MAX;
}
/**
* __next_mem_range_rev - generic next function for for_each_*_range_rev()
*
* Finds the next range from type_a which is not marked as unsuitable
* in type_b.
*
* @idx: pointer to u64 loop variable
* @nid: node selector, %NUMA_NO_NODE for all nodes
* @flags: pick from blocks based on memory attributes
* @type_a: pointer to memblock_type from where the range is taken
* @type_b: pointer to memblock_type which excludes memory from being taken
* @out_start: ptr to phys_addr_t for start address of the range, can be %NULL
* @out_end: ptr to phys_addr_t for end address of the range, can be %NULL
* @out_nid: ptr to int for nid of the range, can be %NULL
*
* Reverse of __next_mem_range().
*/
void __init_memblock __next_mem_range_rev(u64 *idx, int nid, ulong flags,
struct memblock_type *type_a,
struct memblock_type *type_b,
phys_addr_t *out_start,
phys_addr_t *out_end, int *out_nid)
{
int idx_a = *idx & 0xffffffff;
int idx_b = *idx >> 32;
if (WARN_ONCE(nid == MAX_NUMNODES, "Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
nid = NUMA_NO_NODE;
if (*idx == (u64)ULLONG_MAX) {
idx_a = type_a->cnt - 1;
if (type_b != NULL)
idx_b = type_b->cnt;
else
idx_b = 0;
}
for (; idx_a >= 0; idx_a--) {
struct memblock_region *m = &type_a->regions[idx_a];
phys_addr_t m_start = m->base;
phys_addr_t m_end = m->base + m->size;
int m_nid = memblock_get_region_node(m);
/* only memory regions are associated with nodes, check it */
if (nid != NUMA_NO_NODE && nid != m_nid)
continue;
/* skip hotpluggable memory regions if needed */
if (movable_node_is_enabled() && memblock_is_hotpluggable(m))
continue;
/* if we want mirror memory skip non-mirror memory regions */
if ((flags & MEMBLOCK_MIRROR) && !memblock_is_mirror(m))
continue;
/* skip nomap memory unless we were asked for it explicitly */
if (!(flags & MEMBLOCK_NOMAP) && memblock_is_nomap(m))
continue;
if (!type_b) {
if (out_start)
*out_start = m_start;
if (out_end)
*out_end = m_end;
if (out_nid)
*out_nid = m_nid;
idx_a--;
*idx = (u32)idx_a | (u64)idx_b << 32;
return;
}
/* scan areas before each reservation */
for (; idx_b >= 0; idx_b--) {
struct memblock_region *r;
phys_addr_t r_start;
phys_addr_t r_end;
r = &type_b->regions[idx_b];
r_start = idx_b ? r[-1].base + r[-1].size : 0;
r_end = idx_b < type_b->cnt ?
r->base : ULLONG_MAX;
/*
* if idx_b advanced past idx_a,
* break out to advance idx_a
*/
if (r_end <= m_start)
break;
/* if the two regions intersect, we're done */
if (m_end > r_start) {
if (out_start)
*out_start = max(m_start, r_start);
if (out_end)
*out_end = min(m_end, r_end);
if (out_nid)
*out_nid = m_nid;
if (m_start >= r_start)
idx_a--;
else
idx_b--;
*idx = (u32)idx_a | (u64)idx_b << 32;
return;
}
}
}
/* signal end of iteration */
*idx = ULLONG_MAX;
}
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
/*
* Common iterator interface used to define for_each_mem_range().
*/
void __init_memblock __next_mem_pfn_range(int *idx, int nid,
unsigned long *out_start_pfn,
unsigned long *out_end_pfn, int *out_nid)
{
struct memblock_type *type = &memblock.memory;
struct memblock_region *r;
while (++*idx < type->cnt) {
r = &type->regions[*idx];
if (PFN_UP(r->base) >= PFN_DOWN(r->base + r->size))
continue;
if (nid == MAX_NUMNODES || nid == r->nid)
break;
}
if (*idx >= type->cnt) {
*idx = -1;
return;
}
if (out_start_pfn)
*out_start_pfn = PFN_UP(r->base);
if (out_end_pfn)
*out_end_pfn = PFN_DOWN(r->base + r->size);
if (out_nid)
*out_nid = r->nid;
}
unsigned long __init_memblock memblock_next_valid_pfn(unsigned long pfn,
unsigned long max_pfn)
{
struct memblock_type *type = &memblock.memory;
unsigned int right = type->cnt;
unsigned int mid, left = 0;
phys_addr_t addr = PFN_PHYS(pfn + 1);
do {
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 {
/* addr is within the region, so pfn + 1 is valid */
return min(pfn + 1, max_pfn);
}
} while (left < right);
if (right == type->cnt)
return max_pfn;
else
return min(PHYS_PFN(type->regions[right].base), max_pfn);
}
/**
* memblock_set_node - set node ID on memblock regions
* @base: base of area to set node ID for
* @size: size of area to set node ID for
* @type: memblock type to set node ID for
* @nid: node ID to set
*
* Set the nid of memblock @type regions in [@base,@base+@size) to @nid.
* Regions which cross the area boundaries are split as necessary.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
int __init_memblock memblock_set_node(phys_addr_t base, phys_addr_t size,
struct memblock_type *type, int nid)
{
int start_rgn, end_rgn;
int i, ret;
ret = memblock_isolate_range(type, base, size, &start_rgn, &end_rgn);
if (ret)
return ret;
for (i = start_rgn; i < end_rgn; i++)
memblock_set_region_node(&type->regions[i], nid);
memblock_merge_regions(type);
return 0;
}
#endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */
static phys_addr_t __init memblock_alloc_range_nid(phys_addr_t size,
phys_addr_t align, phys_addr_t start,
phys_addr_t end, int nid, ulong flags)
{
phys_addr_t found;
if (!align)
align = SMP_CACHE_BYTES;
found = memblock_find_in_range_node(size, align, start, end, nid,
flags);
if (found && !memblock_reserve(found, size)) {
/*
* The min_count is set to 0 so that memblock allocations are
* never reported as leaks.
*/
kmemleak_alloc_phys(found, size, 0, 0);
return found;
}
return 0;
}
phys_addr_t __init memblock_alloc_range(phys_addr_t size, phys_addr_t align,
phys_addr_t start, phys_addr_t end,
ulong flags)
{
return memblock_alloc_range_nid(size, align, start, end, NUMA_NO_NODE,
flags);
}
static phys_addr_t __init memblock_alloc_base_nid(phys_addr_t size,
phys_addr_t align, phys_addr_t max_addr,
int nid, ulong flags)
{
return memblock_alloc_range_nid(size, align, 0, max_addr, nid, flags);
}
phys_addr_t __init memblock_alloc_nid(phys_addr_t size, phys_addr_t align, int nid)
{
ulong flags = choose_memblock_flags();
phys_addr_t ret;
again:
ret = memblock_alloc_base_nid(size, align, MEMBLOCK_ALLOC_ACCESSIBLE,
nid, flags);
if (!ret && (flags & MEMBLOCK_MIRROR)) {
flags &= ~MEMBLOCK_MIRROR;
goto again;
}
return ret;
}
phys_addr_t __init __memblock_alloc_base(phys_addr_t size, phys_addr_t align, phys_addr_t max_addr)
{
return memblock_alloc_base_nid(size, align, max_addr, NUMA_NO_NODE,
MEMBLOCK_NONE);
}
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 %pa bytes below %pa.\n",
&size, &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);
}
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_ACCESSIBLE);
}
/**
* memblock_virt_alloc_internal - allocate boot memory block
* @size: size of memory block to be allocated in bytes
* @align: alignment of the region and block's size
* @min_addr: the lower bound of the memory region to allocate (phys address)
* @max_addr: the upper bound of the memory region to allocate (phys address)
* @nid: nid of the free area to find, %NUMA_NO_NODE for any node
*
* The @min_addr limit is dropped if it can not be satisfied and the allocation
* will fall back to memory below @min_addr. Also, allocation may fall back
* to any node in the system if the specified node can not
* hold the requested memory.
*
* The allocation is performed from memory region limited by
* memblock.current_limit if @max_addr == %BOOTMEM_ALLOC_ACCESSIBLE.
*
* The memory block is aligned on SMP_CACHE_BYTES if @align == 0.
*
* The phys address of allocated boot memory block is converted to virtual and
* allocated memory is reset to 0.
*
* In addition, function sets the min_count to 0 using kmemleak_alloc for
* allocated boot memory block, so that it is never reported as leaks.
*
* RETURNS:
* Virtual address of allocated memory block on success, NULL on failure.
*/
static void * __init memblock_virt_alloc_internal(
phys_addr_t size, phys_addr_t align,
phys_addr_t min_addr, phys_addr_t max_addr,
int nid)
{
phys_addr_t alloc;
void *ptr;
ulong flags = choose_memblock_flags();
if (WARN_ONCE(nid == MAX_NUMNODES, "Usage of MAX_NUMNODES is deprecated. Use NUMA_NO_NODE instead\n"))
nid = NUMA_NO_NODE;
/*
* Detect any accidental use of these APIs after slab is ready, as at
* this moment memblock may be deinitialized already and its
* internal data may be destroyed (after execution of free_all_bootmem)
*/
if (WARN_ON_ONCE(slab_is_available()))
return kzalloc_node(size, GFP_NOWAIT, nid);
if (!align)
align = SMP_CACHE_BYTES;
if (max_addr > memblock.current_limit)
max_addr = memblock.current_limit;
again:
alloc = memblock_find_in_range_node(size, align, min_addr, max_addr,
nid, flags);
if (alloc && !memblock_reserve(alloc, size))
goto done;
if (nid != NUMA_NO_NODE) {
alloc = memblock_find_in_range_node(size, align, min_addr,
max_addr, NUMA_NO_NODE,
flags);
if (alloc && !memblock_reserve(alloc, size))
goto done;
}
if (min_addr) {
min_addr = 0;
goto again;
}
if (flags & MEMBLOCK_MIRROR) {
flags &= ~MEMBLOCK_MIRROR;
pr_warn("Could not allocate %pap bytes of mirrored memory\n",
&size);
goto again;
}
return NULL;
done:
ptr = phys_to_virt(alloc);
memset(ptr, 0, size);
/*
* The min_count is set to 0 so that bootmem allocated blocks
* are never reported as leaks. This is because many of these blocks
* are only referred via the physical address which is not
* looked up by kmemleak.
*/
kmemleak_alloc(ptr, size, 0, 0);
return ptr;
}
/**
* memblock_virt_alloc_try_nid_nopanic - allocate boot memory block
* @size: size of memory block to be allocated in bytes
* @align: alignment of the region and block's size
* @min_addr: the lower bound of the memory region from where the allocation
* is preferred (phys address)
* @max_addr: the upper bound of the memory region from where the allocation
* is preferred (phys address), or %BOOTMEM_ALLOC_ACCESSIBLE to
* allocate only from memory limited by memblock.current_limit value
* @nid: nid of the free area to find, %NUMA_NO_NODE for any node
*
* Public version of _memblock_virt_alloc_try_nid_nopanic() which provides
* additional debug information (including caller info), if enabled.
*
* RETURNS:
* Virtual address of allocated memory block on success, NULL on failure.
*/
void * __init memblock_virt_alloc_try_nid_nopanic(
phys_addr_t size, phys_addr_t align,
phys_addr_t min_addr, phys_addr_t max_addr,
int nid)
{
memblock_dbg("%s: %llu bytes align=0x%llx nid=%d from=0x%llx max_addr=0x%llx %pF\n",
__func__, (u64)size, (u64)align, nid, (u64)min_addr,
(u64)max_addr, (void *)_RET_IP_);
return memblock_virt_alloc_internal(size, align, min_addr,
max_addr, nid);
}
/**
* memblock_virt_alloc_try_nid - allocate boot memory block with panicking
* @size: size of memory block to be allocated in bytes
* @align: alignment of the region and block's size
* @min_addr: the lower bound of the memory region from where the allocation
* is preferred (phys address)
* @max_addr: the upper bound of the memory region from where the allocation
* is preferred (phys address), or %BOOTMEM_ALLOC_ACCESSIBLE to
* allocate only from memory limited by memblock.current_limit value
* @nid: nid of the free area to find, %NUMA_NO_NODE for any node
*
* Public panicking version of _memblock_virt_alloc_try_nid_nopanic()
* which provides debug information (including caller info), if enabled,
* and panics if the request can not be satisfied.
*
* RETURNS:
* Virtual address of allocated memory block on success, NULL on failure.
*/
void * __init memblock_virt_alloc_try_nid(
phys_addr_t size, phys_addr_t align,
phys_addr_t min_addr, phys_addr_t max_addr,
int nid)
{
void *ptr;
memblock_dbg("%s: %llu bytes align=0x%llx nid=%d from=0x%llx max_addr=0x%llx %pF\n",
__func__, (u64)size, (u64)align, nid, (u64)min_addr,
(u64)max_addr, (void *)_RET_IP_);
ptr = memblock_virt_alloc_internal(size, align,
min_addr, max_addr, nid);
if (ptr)
return ptr;
panic("%s: Failed to allocate %llu bytes align=0x%llx nid=%d from=0x%llx max_addr=0x%llx\n",
__func__, (u64)size, (u64)align, nid, (u64)min_addr,
(u64)max_addr);
return NULL;
}
/**
* __memblock_free_early - free boot memory block
* @base: phys starting address of the boot memory block
* @size: size of the boot memory block in bytes
*
* Free boot memory block previously allocated by memblock_virt_alloc_xx() API.
* The freeing memory will not be released to the buddy allocator.
*/
void __init __memblock_free_early(phys_addr_t base, phys_addr_t size)
{
memblock_dbg("%s: [%#016llx-%#016llx] %pF\n",
__func__, (u64)base, (u64)base + size - 1,
(void *)_RET_IP_);
kmemleak_free_part_phys(base, size);
memblock_remove_range(&memblock.reserved, base, size);
}
/*
* __memblock_free_late - free bootmem block pages directly to buddy allocator
* @addr: phys starting address of the boot memory block
* @size: size of the boot memory block in bytes
*
* This is only useful when the bootmem allocator has already been torn
* down, but we are still initializing the system. Pages are released directly
* to the buddy allocator, no bootmem metadata is updated because it is gone.
*/
void __init __memblock_free_late(phys_addr_t base, phys_addr_t size)
{
u64 cursor, end;
memblock_dbg("%s: [%#016llx-%#016llx] %pF\n",
__func__, (u64)base, (u64)base + size - 1,
(void *)_RET_IP_);
kmemleak_free_part_phys(base, size);
cursor = PFN_UP(base);
end = PFN_DOWN(base + size);
for (; cursor < end; cursor++) {
__free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
totalram_pages++;
}
}
/*
* Remaining API functions
*/
phys_addr_t __init_memblock memblock_phys_mem_size(void)
{
return memblock.memory.total_size;
}
phys_addr_t __init_memblock memblock_reserved_size(void)
{
return memblock.reserved.total_size;
}
phys_addr_t __init memblock_mem_size(unsigned long limit_pfn)
{
unsigned long pages = 0;
struct memblock_region *r;
unsigned long start_pfn, end_pfn;
for_each_memblock(memory, r) {
start_pfn = memblock_region_memory_base_pfn(r);
end_pfn = memblock_region_memory_end_pfn(r);
start_pfn = min_t(unsigned long, start_pfn, limit_pfn);
end_pfn = min_t(unsigned long, end_pfn, limit_pfn);
pages += end_pfn - start_pfn;
}
return PFN_PHYS(pages);
}
/* lowest address */
phys_addr_t __init_memblock memblock_start_of_DRAM(void)
{
return memblock.memory.regions[0].base;
}
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);
}
static phys_addr_t __init_memblock __find_max_addr(phys_addr_t limit)
{
phys_addr_t max_addr = (phys_addr_t)ULLONG_MAX;
struct memblock_region *r;
/*
* translate the memory @limit size into the max address within one of
* the memory memblock regions, if the @limit exceeds the total size
* of those regions, max_addr will keep original value ULLONG_MAX
*/
for_each_memblock(memory, r) {
if (limit <= r->size) {
max_addr = r->base + limit;
break;
}
limit -= r->size;
}
return max_addr;
}
void __init memblock_enforce_memory_limit(phys_addr_t limit)
{
phys_addr_t max_addr = (phys_addr_t)ULLONG_MAX;
if (!limit)
return;
max_addr = __find_max_addr(limit);
/* @limit exceeds the total size of the memory, do nothing */
if (max_addr == (phys_addr_t)ULLONG_MAX)
return;
/* truncate both memory and reserved regions */
memblock_remove_range(&memblock.memory, max_addr,
(phys_addr_t)ULLONG_MAX);
memblock_remove_range(&memblock.reserved, max_addr,
(phys_addr_t)ULLONG_MAX);
}
void __init memblock_cap_memory_range(phys_addr_t base, phys_addr_t size)
{
int start_rgn, end_rgn;
int i, ret;
if (!size)
return;
ret = memblock_isolate_range(&memblock.memory, base, size,
&start_rgn, &end_rgn);
if (ret)
return;
/* remove all the MAP regions */
for (i = memblock.memory.cnt - 1; i >= end_rgn; i--)
if (!memblock_is_nomap(&memblock.memory.regions[i]))
memblock_remove_region(&memblock.memory, i);
for (i = start_rgn - 1; i >= 0; i--)
if (!memblock_is_nomap(&memblock.memory.regions[i]))
memblock_remove_region(&memblock.memory, i);
/* truncate the reserved regions */
memblock_remove_range(&memblock.reserved, 0, base);
memblock_remove_range(&memblock.reserved,
base + size, (phys_addr_t)ULLONG_MAX);
}
void __init memblock_mem_limit_remove_map(phys_addr_t limit)
{
phys_addr_t max_addr;
if (!limit)
return;
max_addr = __find_max_addr(limit);
/* @limit exceeds the total size of the memory, do nothing */
if (max_addr == (phys_addr_t)ULLONG_MAX)
return;
memblock_cap_memory_range(0, max_addr);
}
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;
}
bool __init memblock_is_reserved(phys_addr_t addr)
{
return memblock_search(&memblock.reserved, addr) != -1;
}
bool __init_memblock memblock_is_memory(phys_addr_t addr)
{
return memblock_search(&memblock.memory, addr) != -1;
}
int __init_memblock memblock_is_map_memory(phys_addr_t addr)
{
int i = memblock_search(&memblock.memory, addr);
if (i == -1)
return false;
return !memblock_is_nomap(&memblock.memory.regions[i]);
}
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
int __init_memblock memblock_search_pfn_nid(unsigned long pfn,
unsigned long *start_pfn, unsigned long *end_pfn)
{
struct memblock_type *type = &memblock.memory;
int mid = memblock_search(type, PFN_PHYS(pfn));
if (mid == -1)
return -1;
*start_pfn = PFN_DOWN(type->regions[mid].base);
*end_pfn = PFN_DOWN(type->regions[mid].base + type->regions[mid].size);
return type->regions[mid].nid;
}
#endif
/**
* memblock_is_region_memory - check if a region is a subset of memory
* @base: base of region to check
* @size: size of region to check
*
* Check if the region [@base, @base+@size) is a subset of a memory block.
*
* RETURNS:
* 0 if false, non-zero if true
*/
int __init_memblock memblock_is_region_memory(phys_addr_t base, phys_addr_t size)
{
int idx = memblock_search(&memblock.memory, base);
phys_addr_t end = base + memblock_cap_size(base, &size);
if (idx == -1)
return 0;
return (memblock.memory.regions[idx].base +
memblock.memory.regions[idx].size) >= end;
}
/**
* memblock_is_region_reserved - check if a region intersects reserved memory
* @base: base of region to check
* @size: size of region to check
*
* Check if the region [@base, @base+@size) intersects a reserved memory block.
*
* RETURNS:
* True if they intersect, false if not.
*/
bool __init_memblock memblock_is_region_reserved(phys_addr_t base, phys_addr_t size)
{
memblock_cap_size(base, &size);
return memblock_overlaps_region(&memblock.reserved, base, size);
}
void __init_memblock memblock_trim_memory(phys_addr_t align)
{
phys_addr_t start, end, orig_start, orig_end;
struct memblock_region *r;
for_each_memblock(memory, r) {
orig_start = r->base;
orig_end = r->base + r->size;
start = round_up(orig_start, align);
end = round_down(orig_end, align);
if (start == orig_start && end == orig_end)
continue;
if (start < end) {
r->base = start;
r->size = end - start;
} else {
memblock_remove_region(&memblock.memory,
r - memblock.memory.regions);
r--;
}
}
}
void __init_memblock memblock_set_current_limit(phys_addr_t limit)
{
memblock.current_limit = limit;
}
phys_addr_t __init_memblock memblock_get_current_limit(void)
{
return memblock.current_limit;
}
static void __init_memblock memblock_dump(struct memblock_type *type)
{
phys_addr_t base, end, size;
unsigned long flags;
int idx;
struct memblock_region *rgn;
pr_info(" %s.cnt = 0x%lx\n", type->name, type->cnt);
for_each_memblock_type(type, rgn) {
char nid_buf[32] = "";
base = rgn->base;
size = rgn->size;
end = base + size - 1;
flags = rgn->flags;
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
if (memblock_get_region_node(rgn) != MAX_NUMNODES)
snprintf(nid_buf, sizeof(nid_buf), " on node %d",
memblock_get_region_node(rgn));
#endif
pr_info(" %s[%#x]\t[%pa-%pa], %pa bytes%s flags: %#lx\n",
type->name, idx, &base, &end, &size, nid_buf, flags);
}
}
extern unsigned long __init_memblock
memblock_reserved_memory_within(phys_addr_t start_addr, phys_addr_t end_addr)
{
struct memblock_region *rgn;
unsigned long size = 0;
int idx;
for_each_memblock_type((&memblock.reserved), rgn) {
phys_addr_t start, end;
if (rgn->base + rgn->size < start_addr)
continue;
if (rgn->base > end_addr)
continue;
start = rgn->base;
end = start + rgn->size;
size += end - start;
}
return size;
}
void __init_memblock __memblock_dump_all(void)
{
pr_info("MEMBLOCK configuration:\n");
pr_info(" memory size = %pa reserved size = %pa\n",
&memblock.memory.total_size,
&memblock.reserved.total_size);
memblock_dump(&memblock.memory);
memblock_dump(&memblock.reserved);
#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
memblock_dump(&memblock.physmem);
#endif
}
void __init memblock_allow_resize(void)
{
memblock_can_resize = 1;
}
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(CONFIG_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;
phys_addr_t end;
for (i = 0; i < type->cnt; i++) {
reg = &type->regions[i];
end = reg->base + reg->size - 1;
seq_printf(m, "%4d: ", i);
seq_printf(m, "%pa..%pa\n", &reg->base, &end);
}
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);
#ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
debugfs_create_file("physmem", S_IRUGO, root, &memblock.physmem, &memblock_debug_fops);
#endif
return 0;
}
__initcall(memblock_init_debugfs);
#endif /* CONFIG_DEBUG_FS */