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s390/mem_detect: remove artificial kdump memory types

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Simplify the memory detection code a bit by removing the CHUNK_OLDMEM
and CHUNK_CRASHK memory types.
They are not needed. Everything that is needed is a mechanism to
insert holes into the detected memory.

Reviewed-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2013-04-30 19:19:58 +02:00 • committed by Martin Schwidefsky
parent d3383632d4
commit 996b4a7d8f
5 changed files with 41 additions and 103 deletions
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98
arch/s390/mm/mem_detect.c
View file

@ -95,82 +95,40 @@ out:
EXPORT_SYMBOL(detect_memory_layout);
/*
* Move memory chunks array from index "from" to index "to"
* Create memory hole with given address and size.
*/
static void mem_chunk_move(struct mem_chunk chunk[], int to, int from)
void create_mem_hole(struct mem_chunk mem_chunk[], unsigned long addr,
unsigned long size)
{
int cnt = MEMORY_CHUNKS - to;
memmove(&chunk[to], &chunk[from], cnt * sizeof(struct mem_chunk));
}
/*
* Initialize memory chunk
*/
static void mem_chunk_init(struct mem_chunk *chunk, unsigned long addr,
unsigned long size, int type)
{
chunk->type = type;
chunk->addr = addr;
chunk->size = size;
}
/*
* Create memory hole with given address, size, and type
*/
void create_mem_hole(struct mem_chunk chunk[], unsigned long addr,
unsigned long size, int type)
{
unsigned long lh_start, lh_end, lh_size, ch_start, ch_end, ch_size;
int i, ch_type;
int i;
for (i = 0; i < MEMORY_CHUNKS; i++) {
if (chunk[i].size == 0)
struct mem_chunk *chunk = &mem_chunk[i];
if (chunk->size == 0)
continue;
if (addr > chunk->addr + chunk->size)
continue;
if (addr + size <= chunk->addr)
continue;
/* Split */
if ((addr > chunk->addr) &&
(addr + size < chunk->addr + chunk->size)) {
struct mem_chunk *new = chunk + 1;
/* Define chunk properties */
ch_start = chunk[i].addr;
ch_size = chunk[i].size;
ch_end = ch_start + ch_size - 1;
ch_type = chunk[i].type;
/* Is memory chunk hit by memory hole? */
if (addr + size <= ch_start)
continue; /* No: memory hole in front of chunk */
if (addr > ch_end)
continue; /* No: memory hole after chunk */
/* Yes: Define local hole properties */
lh_start = max(addr, chunk[i].addr);
lh_end = min(addr + size - 1, ch_end);
lh_size = lh_end - lh_start + 1;
if (lh_start == ch_start && lh_end == ch_end) {
/* Hole covers complete memory chunk */
mem_chunk_init(&chunk[i], lh_start, lh_size, type);
} else if (lh_end == ch_end) {
/* Hole starts in memory chunk and convers chunk end */
mem_chunk_move(chunk, i + 1, i);
mem_chunk_init(&chunk[i], ch_start, ch_size - lh_size,
ch_type);
mem_chunk_init(&chunk[i + 1], lh_start, lh_size, type);
i += 1;
} else if (lh_start == ch_start) {
/* Hole ends in memory chunk */
mem_chunk_move(chunk, i + 1, i);
mem_chunk_init(&chunk[i], lh_start, lh_size, type);
mem_chunk_init(&chunk[i + 1], lh_end + 1,
ch_size - lh_size, ch_type);
break;
} else {
/* Hole splits memory chunk */
mem_chunk_move(chunk, i + 2, i);
mem_chunk_init(&chunk[i], ch_start,
lh_start - ch_start, ch_type);
mem_chunk_init(&chunk[i + 1], lh_start, lh_size, type);
mem_chunk_init(&chunk[i + 2], lh_end + 1,
ch_end - lh_end, ch_type);
break;
memmove(new, chunk, (MEMORY_CHUNKS-i-1) * sizeof(*new));
new->addr = addr + size;
new->size = chunk->addr + chunk->size - new->addr;
chunk->size = addr - chunk->addr;
continue;
} else if ((addr <= chunk->addr) &&
(addr + size >= chunk->addr + chunk->size)) {
memset(chunk, 0 , sizeof(*chunk));
} else if (addr + size < chunk->addr + chunk->size) {
chunk->size = chunk->addr + chunk->size - addr - size;
chunk->addr = addr + size;
} else if (addr > chunk->addr) {
chunk->size = addr - chunk->addr;
}
}
}