mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-04 07:16:45 +07:00
60a0c68df2
This patch provides the architecture specific part of the s390 kdump support. Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/*
|
|
* Copyright IBM Corp. 2008, 2009
|
|
*
|
|
* Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <asm/ipl.h>
|
|
#include <asm/sclp.h>
|
|
#include <asm/setup.h>
|
|
|
|
#define ADDR2G (1ULL << 31)
|
|
|
|
static void find_memory_chunks(struct mem_chunk chunk[])
|
|
{
|
|
unsigned long long memsize, rnmax, rzm;
|
|
unsigned long addr = 0, size;
|
|
int i = 0, type;
|
|
|
|
rzm = sclp_get_rzm();
|
|
rnmax = sclp_get_rnmax();
|
|
memsize = rzm * rnmax;
|
|
if (!rzm)
|
|
rzm = 1ULL << 17;
|
|
if (sizeof(long) == 4) {
|
|
rzm = min(ADDR2G, rzm);
|
|
memsize = memsize ? min(ADDR2G, memsize) : ADDR2G;
|
|
}
|
|
do {
|
|
size = 0;
|
|
type = tprot(addr);
|
|
do {
|
|
size += rzm;
|
|
if (memsize && addr + size >= memsize)
|
|
break;
|
|
} while (type == tprot(addr + size));
|
|
if (type == CHUNK_READ_WRITE || type == CHUNK_READ_ONLY) {
|
|
chunk[i].addr = addr;
|
|
chunk[i].size = size;
|
|
chunk[i].type = type;
|
|
i++;
|
|
}
|
|
addr += size;
|
|
} while (addr < memsize && i < MEMORY_CHUNKS);
|
|
}
|
|
|
|
void detect_memory_layout(struct mem_chunk chunk[])
|
|
{
|
|
unsigned long flags, cr0;
|
|
|
|
memset(chunk, 0, MEMORY_CHUNKS * sizeof(struct mem_chunk));
|
|
/* Disable IRQs, DAT and low address protection so tprot does the
|
|
* right thing and we don't get scheduled away with low address
|
|
* protection disabled.
|
|
*/
|
|
flags = __arch_local_irq_stnsm(0xf8);
|
|
__ctl_store(cr0, 0, 0);
|
|
__ctl_clear_bit(0, 28);
|
|
find_memory_chunks(chunk);
|
|
__ctl_load(cr0, 0, 0);
|
|
arch_local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL(detect_memory_layout);
|
|
|
|
/*
|
|
* Create memory hole with given address, size, and type
|
|
*/
|
|
void create_mem_hole(struct mem_chunk chunks[], unsigned long addr,
|
|
unsigned long size, int type)
|
|
{
|
|
unsigned long start, end, new_size;
|
|
int i;
|
|
|
|
for (i = 0; i < MEMORY_CHUNKS; i++) {
|
|
if (chunks[i].size == 0)
|
|
continue;
|
|
if (addr + size < chunks[i].addr)
|
|
continue;
|
|
if (addr >= chunks[i].addr + chunks[i].size)
|
|
continue;
|
|
start = max(addr, chunks[i].addr);
|
|
end = min(addr + size, chunks[i].addr + chunks[i].size);
|
|
new_size = end - start;
|
|
if (new_size == 0)
|
|
continue;
|
|
if (start == chunks[i].addr &&
|
|
end == chunks[i].addr + chunks[i].size) {
|
|
/* Remove chunk */
|
|
chunks[i].type = type;
|
|
} else if (start == chunks[i].addr) {
|
|
/* Make chunk smaller at start */
|
|
if (i >= MEMORY_CHUNKS - 1)
|
|
panic("Unable to create memory hole");
|
|
memmove(&chunks[i + 1], &chunks[i],
|
|
sizeof(struct mem_chunk) *
|
|
(MEMORY_CHUNKS - (i + 1)));
|
|
chunks[i + 1].addr = chunks[i].addr + new_size;
|
|
chunks[i + 1].size = chunks[i].size - new_size;
|
|
chunks[i].size = new_size;
|
|
chunks[i].type = type;
|
|
i += 1;
|
|
} else if (end == chunks[i].addr + chunks[i].size) {
|
|
/* Make chunk smaller at end */
|
|
if (i >= MEMORY_CHUNKS - 1)
|
|
panic("Unable to create memory hole");
|
|
memmove(&chunks[i + 1], &chunks[i],
|
|
sizeof(struct mem_chunk) *
|
|
(MEMORY_CHUNKS - (i + 1)));
|
|
chunks[i + 1].addr = start;
|
|
chunks[i + 1].size = new_size;
|
|
chunks[i + 1].type = type;
|
|
chunks[i].size -= new_size;
|
|
i += 1;
|
|
} else {
|
|
/* Create memory hole */
|
|
if (i >= MEMORY_CHUNKS - 2)
|
|
panic("Unable to create memory hole");
|
|
memmove(&chunks[i + 2], &chunks[i],
|
|
sizeof(struct mem_chunk) *
|
|
(MEMORY_CHUNKS - (i + 2)));
|
|
chunks[i + 1].addr = addr;
|
|
chunks[i + 1].size = size;
|
|
chunks[i + 1].type = type;
|
|
chunks[i + 2].addr = addr + size;
|
|
chunks[i + 2].size =
|
|
chunks[i].addr + chunks[i].size - (addr + size);
|
|
chunks[i + 2].type = chunks[i].type;
|
|
chunks[i].size = addr - chunks[i].addr;
|
|
i += 2;
|
|
}
|
|
}
|
|
}
|