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OpenCloudOS-Kernel
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[S390] Add architecture code for unmapping crashkernel memory 

This patch implements the crash_map_pages() function for s390.
KEXEC_CRASH_MEM_ALIGN is set to HPAGE_SIZE, in order to support
kernel mappings that use large pages. We also use HPAGE_SIZE alignment
for CONFIG_HUGETLB_PAGE=n in order to have the same 1 MiB alignment on
all s390 systems.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu 2011-10-30 15:16:44 +01:00 committed by Martin Schwidefsky
parent 558df7209e
commit dab7a7b153
3 changed files with 40 additions and 4 deletions
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3
arch/s390/include/asm/kexec.h
View File

@ -36,6 +36,9 @@
/* Allocate one page for the pdp and the second for the code */
#define KEXEC_CONTROL_PAGE_SIZE 4096
/* Alignment of crashkernel memory */
#define KEXEC_CRASH_MEM_ALIGN HPAGE_SIZE
/* The native architecture */
#define KEXEC_ARCH KEXEC_ARCH_S390

31
arch/s390/kernel/machine_kexec.c
View File

@ -132,6 +132,37 @@ static int kdump_csum_valid(struct kimage *image)
#endif
}
/*
* Map or unmap crashkernel memory
*/
static void crash_map_pages(int enable)
{
unsigned long size = resource_size(&crashk_res);
BUG_ON(crashk_res.start % KEXEC_CRASH_MEM_ALIGN ||
size % KEXEC_CRASH_MEM_ALIGN);
if (enable)
vmem_add_mapping(crashk_res.start, size);
else
vmem_remove_mapping(crashk_res.start, size);
}
/*
* Map crashkernel memory
*/
void crash_map_reserved_pages(void)
{
crash_map_pages(1);
}
/*
* Unmap crashkernel memory
*/
void crash_unmap_reserved_pages(void)
{
crash_map_pages(0);
}
/*
* Give back memory to hypervisor before new kdump is loaded
*/

10
arch/s390/kernel/setup.c
View File

@ -446,6 +446,7 @@ static void __init setup_resources(void)
res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
switch (memory_chunk[i].type) {
case CHUNK_READ_WRITE:
case CHUNK_CRASHK:
res->name = "System RAM";
break;
case CHUNK_READ_ONLY:
@ -720,8 +721,8 @@ static void __init reserve_crashkernel(void)
&crash_base);
if (rc || crash_size == 0)
return;
crash_base = PAGE_ALIGN(crash_base);
crash_size = PAGE_ALIGN(crash_size);
crash_base = ALIGN(crash_base, KEXEC_CRASH_MEM_ALIGN);
crash_size = ALIGN(crash_size, KEXEC_CRASH_MEM_ALIGN);
if (register_memory_notifier(&kdump_mem_nb))
return;
if (!crash_base)
@ -741,7 +742,7 @@ static void __init reserve_crashkernel(void)
crashk_res.start = crash_base;
crashk_res.end = crash_base + crash_size - 1;
insert_resource(&iomem_resource, &crashk_res);
reserve_kdump_bootmem(crash_base, crash_size, CHUNK_READ_WRITE);
reserve_kdump_bootmem(crash_base, crash_size, CHUNK_CRASHK);
pr_info("Reserving %lluMB of memory at %lluMB "
"for crashkernel (System RAM: %luMB)\n",
crash_size >> 20, crash_base >> 20, memory_end >> 20);
@ -816,7 +817,8 @@ setup_memory(void)
for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
unsigned long start_chunk, end_chunk, pfn;
if (memory_chunk[i].type != CHUNK_READ_WRITE)
if (memory_chunk[i].type != CHUNK_READ_WRITE &&
memory_chunk[i].type != CHUNK_CRASHK)
continue;
start_chunk = PFN_DOWN(memory_chunk[i].addr);
end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);