static long __init_memblock __memblock_remove(struct memblock_type *type,
phys_addr_t base, phys_addr_t size)
{
phys_addr_t end = base + memblock_cap_size(base, &size);
int i;
/* Walk through the array for collisions */
for (i = 0; i < type->cnt; i++) {
struct memblock_region *rgn = &type->regions[i];
phys_addr_t rend = rgn->base + rgn->size;
/* Nothing more to do, exit */
if (rgn->base > end || rgn->size == 0)
break;
/* If we fully enclose the block, drop it */
if (base <= rgn->base && end >= rend) {
memblock_remove_region(type, i--);
continue;
}
/* If we are fully enclosed within a block
* then we need to split it and we are done
*/
if (base > rgn->base && end < rend) {
rgn->size = base - rgn->base;
if (!memblock_add_region(type, end, rend - end))
return 0;
/* Failure to split is bad, we at least
* restore the block before erroring
*/
rgn->size = rend - rgn->base;
WARN_ON(1);
return -1;
}
/* Check if we need to trim the bottom of a block */
if (rgn->base < end && rend > end) {
rgn->size -= end - rgn->base;
rgn->base = end;
break;
}
/* And check if we need to trim the top of a block */
if (base < rend)
rgn->size -= rend - base;
}
return 0;
}
static int __init_memblock __memblock_remove(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;
}
static long __memblock_remove(struct memblock_region *rgn, u64 base, u64 size)
{
u64 rgnbegin, rgnend;
u64 end = base + size;
int i;
rgnbegin = rgnend = 0; /* supress gcc warnings */
/* Find the region where (base, size) belongs to */
for (i=0; i < rgn->cnt; i++) {
rgnbegin = rgn->region[i].base;
rgnend = rgnbegin + rgn->region[i].size;
if ((rgnbegin <= base) && (end <= rgnend))
break;
}
/* Didn't find the region */
if (i == rgn->cnt)
return -1;
/* Check to see if we are removing entire region */
if ((rgnbegin == base) && (rgnend == end)) {
memblock_remove_region(rgn, i);
return 0;
}
/* Check to see if region is matching at the front */
if (rgnbegin == base) {
rgn->region[i].base = end;
rgn->region[i].size -= size;
return 0;
}
/* Check to see if the region is matching at the end */
if (rgnend == end) {
rgn->region[i].size -= size;
return 0;
}
/*
* We need to split the entry - adjust the current one to the
* beginging of the hole and add the region after hole.
*/
rgn->region[i].size = base - rgn->region[i].base;
return memblock_add_region(rgn, end, rgnend - end);
}
/* You must call memblock_analyze() after this. */
void __init memblock_enforce_memory_limit(u64 memory_limit)
{
unsigned long i;
u64 limit;
struct memblock_property *p;
if (!memory_limit)
return;
/* Truncate the memblock regions to satisfy the memory limit. */
limit = memory_limit;
for (i = 0; i < memblock.memory.cnt; i++) {
if (limit > memblock.memory.region[i].size) {
limit -= memblock.memory.region[i].size;
continue;
}
memblock.memory.region[i].size = limit;
memblock.memory.cnt = i + 1;
break;
}
if (memblock.memory.region[0].size < memblock.rmo_size)
memblock.rmo_size = memblock.memory.region[0].size;
memory_limit = memblock_end_of_DRAM();
/* And truncate any reserves above the limit also. */
for (i = 0; i < memblock.reserved.cnt; i++) {
p = &memblock.reserved.region[i];
if (p->base > memory_limit)
p->size = 0;
else if ((p->base + p->size) > memory_limit)
p->size = memory_limit - p->base;
if (p->size == 0) {
memblock_remove_region(&memblock.reserved, i);
i--;
}
}
}
static 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;
}
/* Assumption: base addr of region 1 < base addr of region 2 */
static void memblock_coalesce_regions(struct memblock_region *rgn,
unsigned long r1, unsigned long r2)
{
rgn->region[r1].size += rgn->region[r2].size;
memblock_remove_region(rgn, r2);
}