/**
* 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 i;
*start_rgn = *end_rgn = 0;
/* we'll create at most two more regions */
while (type->cnt + 2 > type->max)
if (memblock_double_array(type) < 0)
return -ENOMEM;
for (i = 0; i < type->cnt; i++) {
struct memblock_region *rgn = &type->regions[i];
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, i, rbase, base - rbase,
memblock_get_region_node(rgn));
} 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, i--, rbase, end - rbase,
memblock_get_region_node(rgn));
} else {
/* @rgn is fully contained, record it */
if (!*end_rgn)
*start_rgn = i;
*end_rgn = i + 1;
}
}
return 0;
}
/**
* 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
* @nid: node ID to set
*
* Set the nid of memblock memory 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,
int nid)
{
struct memblock_type *type = &memblock.memory;
phys_addr_t end = base + size;
int i;
/* we'll create at most two more regions */
while (type->cnt + 2 > type->max)
if (memblock_double_array(type) < 0)
return -ENOMEM;
for (i = 0; i < type->cnt; i++) {
struct memblock_region *rgn = &type->regions[i];
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 = rend - rgn->base;
memblock_insert_region(type, i, rbase, base - rbase,
rgn->nid);
} else if (rend > end) {
/*
* @rgn intersects from above. Split and redo the
* current region - the new bottom half.
*/
rgn->base = end;
rgn->size = rend - rgn->base;
memblock_insert_region(type, i--, rbase, end - rbase,
rgn->nid);
} else {
/* @rgn is fully contained, set ->nid */
rgn->nid = nid;
}
}
memblock_merge_regions(type);
return 0;
}
static long __init_memblock memblock_add_region(struct memblock_type *type,
phys_addr_t base, phys_addr_t size)
{
phys_addr_t end = base + memblock_cap_size(base, &size);
int i, slot = -1;
/* First try and coalesce this MEMBLOCK with others */
for (i = 0; i < type->cnt; i++) {
struct memblock_region *rgn = &type->regions[i];
phys_addr_t rend = rgn->base + rgn->size;
/* Exit if there's no possible hits */
if (rgn->base > end || rgn->size == 0)
break;
/* Check if we are fully enclosed within an existing
* block
*/
if (rgn->base <= base && rend >= end)
return 0;
/* Check if we overlap or are adjacent with the bottom
* of a block.
*/
if (base < rgn->base && end >= rgn->base) {
/* If we can't coalesce, create a new block */
if (!memblock_memory_can_coalesce(base, size,
rgn->base,
rgn->size)) {
/* Overlap & can't coalesce are mutually
* exclusive, if you do that, be prepared
* for trouble
*/
WARN_ON(end != rgn->base);
goto new_block;
}
/* We extend the bottom of the block down to our
* base
*/
rgn->base = base;
rgn->size = rend - base;
/* Return if we have nothing else to allocate
* (fully coalesced)
*/
if (rend >= end)
return 0;
/* We continue processing from the end of the
* coalesced block.
*/
base = rend;
size = end - base;
}
/* Now check if we overlap or are adjacent with the
* top of a block
*/
if (base <= rend && end >= rend) {
/* If we can't coalesce, create a new block */
if (!memblock_memory_can_coalesce(rgn->base,
rgn->size,
base, size)) {
/* Overlap & can't coalesce are mutually
* exclusive, if you do that, be prepared
* for trouble
*/
WARN_ON(rend != base);
goto new_block;
}
/* We adjust our base down to enclose the
* original block and destroy it. It will be
* part of our new allocation. Since we've
* freed an entry, we know we won't fail
* to allocate one later, so we won't risk
* losing the original block allocation.
*/
size += (base - rgn->base);
base = rgn->base;
memblock_remove_region(type, i--);
}
}
/* If the array is empty, special case, replace the fake
* filler region and return
*/
if ((type->cnt == 1) && (type->regions[0].size == 0)) {
type->regions[0].base = base;
type->regions[0].size = size;
return 0;
}
new_block:
/* If we are out of space, we fail. It's too late to resize the array
* but then this shouldn't have happened in the first place.
*/
if (WARN_ON(type->cnt >= type->max))
return -1;
/* Couldn't coalesce the MEMBLOCK, so add it to the sorted table. */
for (i = type->cnt - 1; i >= 0; i--) {
if (base < type->regions[i].base) {
type->regions[i+1].base = type->regions[i].base;
type->regions[i+1].size = type->regions[i].size;
} else {
type->regions[i+1].base = base;
type->regions[i+1].size = size;
slot = i + 1;
break;
}
}
if (base < type->regions[0].base) {
type->regions[0].base = base;
type->regions[0].size = size;
slot = 0;
}
type->cnt++;
/* The array is full ? Try to resize it. If that fails, we undo
* our allocation and return an error
*/
if (type->cnt == type->max && memblock_double_array(type)) {
BUG_ON(slot < 0);
memblock_remove_region(type, slot);
return -1;
}
return 0;
}
/**
* memblock_add_region - add new memblock region
* @type: memblock type to add new region into
* @base: base address of the new region
* @size: size of the new region
* @nid: nid of the new region
*
* Add new memblock region [@base,@base+@size) into @type. The new region
* is allowed to overlap with existing ones - overlaps don't affect already
* existing regions. @type is guaranteed to be minimal (all neighbouring
* compatible regions are merged) after the addition.
*
* RETURNS:
* 0 on success, -errno on failure.
*/
static int __init_memblock memblock_add_region(struct memblock_type *type,
phys_addr_t base, phys_addr_t size, int nid)
{
bool insert = false;
phys_addr_t obase = base;
phys_addr_t end = base + memblock_cap_size(base, &size);
int i, nr_new;
/* 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;
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 accomodate the new area. The second actually inserts them.
*/
base = obase;
nr_new = 0;
for (i = 0; i < type->cnt; i++) {
struct memblock_region *rgn = &type->regions[i];
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) {
nr_new++;
if (insert)
memblock_insert_region(type, i++, base,
rbase - base, nid);
}
/* 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, i, base, end - base, nid);
}
/*
* 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) < 0)
return -ENOMEM;
insert = true;
goto repeat;
} else {
memblock_merge_regions(type);
return 0;
}
}
