xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[S390] kernel: Add OS info memory interface

Browse Source 
In order to allow kdump based stand-alone dump, some information
has to be passed from the old kernel to the new dump kernel. This
is done via a the struct "os_info" that contains the following fields:
 * crashkernel base and size
 * reipl block
 * vmcoreinfo
 * init function
A pointer to os_info is stored at a well known storage location
and the whole structure as well as all fields are secured with
checksums.

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
2012-03-11 11:59:34 -04:00
committed by Martin Schwidefsky
parent ad252ffa2a
commit 4857d4bbe9
8 changed files with 304 additions and 20 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
arch/s390/kernel/crash_dump.c
View File

@@ -14,6 +14,7 @@
#include <linux/bootmem.h>
#include <linux/elf.h>
#include <asm/ipl.h>
#include <asm/os_info.h>
#define PTR_ADD(x, y) (((char *) (x)) + ((unsigned long) (y)))
#define PTR_SUB(x, y) (((char *) (x)) - ((unsigned long) (y)))
@@ -51,7 +52,7 @@ ssize_t copy_oldmem_page(unsigned long pfn, char *buf,
/*
* Copy memory from old kernel
*/
static int copy_from_oldmem(void *dest, void *src, size_t count)
int copy_from_oldmem(void *dest, void *src, size_t count)
{
unsigned long copied = 0;
int rc;
@@ -224,28 +225,44 @@ static void *nt_prpsinfo(void *ptr)
}
/*
* Initialize vmcoreinfo note (new kernel)
* Get vmcoreinfo using lowcore->vmcore_info (new kernel)
*/
static void *nt_vmcoreinfo(void *ptr)
static void *get_vmcoreinfo_old(unsigned long *size)
{
char nt_name[11], *vmcoreinfo;
Elf64_Nhdr note;
void *addr;
if (copy_from_oldmem(&addr, &S390_lowcore.vmcore_info, sizeof(addr)))
return ptr;
return NULL;
memset(nt_name, 0, sizeof(nt_name));
if (copy_from_oldmem(&note, addr, sizeof(note)))
return ptr;
return NULL;
if (copy_from_oldmem(nt_name, addr + sizeof(note), sizeof(nt_name) - 1))
return ptr;
return NULL;
if (strcmp(nt_name, "VMCOREINFO") != 0)
return ptr;
vmcoreinfo = kzalloc_panic(note.n_descsz + 1);
return NULL;
vmcoreinfo = kzalloc_panic(note.n_descsz);
if (copy_from_oldmem(vmcoreinfo, addr + 24, note.n_descsz))
return NULL;
*size = note.n_descsz;
return vmcoreinfo;
}
/*
* Initialize vmcoreinfo note (new kernel)
*/
static void *nt_vmcoreinfo(void *ptr)
{
unsigned long size;
void *vmcoreinfo;
vmcoreinfo = os_info_old_entry(OS_INFO_VMCOREINFO, &size);
if (!vmcoreinfo)
vmcoreinfo = get_vmcoreinfo_old(&size);
if (!vmcoreinfo)
return ptr;
vmcoreinfo[note.n_descsz + 1] = 0;
return nt_init(ptr, 0, vmcoreinfo, note.n_descsz, "VMCOREINFO");
return nt_init(ptr, 0, vmcoreinfo, size, "VMCOREINFO");
}
/*