d7b7cdea06
Because of a design change for stand-alone kdump the function that was done by the OS info init function is moved to the boot loader code. This has two implications that are implemented by this patch: a) The OS info init function is no longer called by the kernel b) The diag 308 subcode 1 reset is no longer done by the kdump boot code. This is necessary because otherwise the operation that is done now by the boot loader would be reversed. For the normal kexec based kdump mechansim the reset is already done by the kdump trigger code (e.g. panic or PSW restart). Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
168 lines
3.9 KiB
C
168 lines
3.9 KiB
C
/*
|
|
* OS info memory interface
|
|
*
|
|
* Copyright IBM Corp. 2012
|
|
* Author(s): Michael Holzheu <holzheu@linux.vnet.ibm.com>
|
|
*/
|
|
|
|
#define KMSG_COMPONENT "os_info"
|
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
|
|
|
#include <linux/crash_dump.h>
|
|
#include <linux/kernel.h>
|
|
#include <asm/checksum.h>
|
|
#include <asm/lowcore.h>
|
|
#include <asm/os_info.h>
|
|
|
|
/*
|
|
* OS info structure has to be page aligned
|
|
*/
|
|
static struct os_info os_info __page_aligned_data;
|
|
|
|
/*
|
|
* Compute checksum over OS info structure
|
|
*/
|
|
u32 os_info_csum(struct os_info *os_info)
|
|
{
|
|
int size = sizeof(*os_info) - offsetof(struct os_info, version_major);
|
|
return csum_partial(&os_info->version_major, size, 0);
|
|
}
|
|
|
|
/*
|
|
* Add crashkernel info to OS info and update checksum
|
|
*/
|
|
void os_info_crashkernel_add(unsigned long base, unsigned long size)
|
|
{
|
|
os_info.crashkernel_addr = (u64)(unsigned long)base;
|
|
os_info.crashkernel_size = (u64)(unsigned long)size;
|
|
os_info.csum = os_info_csum(&os_info);
|
|
}
|
|
|
|
/*
|
|
* Add OS info entry and update checksum
|
|
*/
|
|
void os_info_entry_add(int nr, void *ptr, u64 size)
|
|
{
|
|
os_info.entry[nr].addr = (u64)(unsigned long)ptr;
|
|
os_info.entry[nr].size = size;
|
|
os_info.entry[nr].csum = csum_partial(ptr, size, 0);
|
|
os_info.csum = os_info_csum(&os_info);
|
|
}
|
|
|
|
/*
|
|
* Initialize OS info struture and set lowcore pointer
|
|
*/
|
|
void __init os_info_init(void)
|
|
{
|
|
void *ptr = &os_info;
|
|
|
|
os_info.version_major = OS_INFO_VERSION_MAJOR;
|
|
os_info.version_minor = OS_INFO_VERSION_MINOR;
|
|
os_info.magic = OS_INFO_MAGIC;
|
|
os_info.csum = os_info_csum(&os_info);
|
|
copy_to_absolute_zero(&S390_lowcore.os_info, &ptr, sizeof(ptr));
|
|
}
|
|
|
|
#ifdef CONFIG_CRASH_DUMP
|
|
|
|
static struct os_info *os_info_old;
|
|
|
|
/*
|
|
* Allocate and copy OS info entry from oldmem
|
|
*/
|
|
static void os_info_old_alloc(int nr, int align)
|
|
{
|
|
unsigned long addr, size = 0;
|
|
char *buf, *buf_align, *msg;
|
|
u32 csum;
|
|
|
|
addr = os_info_old->entry[nr].addr;
|
|
if (!addr) {
|
|
msg = "not available";
|
|
goto fail;
|
|
}
|
|
size = os_info_old->entry[nr].size;
|
|
buf = kmalloc(size + align - 1, GFP_KERNEL);
|
|
if (!buf) {
|
|
msg = "alloc failed";
|
|
goto fail;
|
|
}
|
|
buf_align = PTR_ALIGN(buf, align);
|
|
if (copy_from_oldmem(buf_align, (void *) addr, size)) {
|
|
msg = "copy failed";
|
|
goto fail_free;
|
|
}
|
|
csum = csum_partial(buf_align, size, 0);
|
|
if (csum != os_info_old->entry[nr].csum) {
|
|
msg = "checksum failed";
|
|
goto fail_free;
|
|
}
|
|
os_info_old->entry[nr].addr = (u64)(unsigned long)buf_align;
|
|
msg = "copied";
|
|
goto out;
|
|
fail_free:
|
|
kfree(buf);
|
|
fail:
|
|
os_info_old->entry[nr].addr = 0;
|
|
out:
|
|
pr_info("entry %i: %s (addr=0x%lx size=%lu)\n",
|
|
nr, msg, addr, size);
|
|
}
|
|
|
|
/*
|
|
* Initialize os info and os info entries from oldmem
|
|
*/
|
|
static void os_info_old_init(void)
|
|
{
|
|
static int os_info_init;
|
|
unsigned long addr;
|
|
|
|
if (os_info_init)
|
|
return;
|
|
if (!OLDMEM_BASE)
|
|
goto fail;
|
|
if (copy_from_oldmem(&addr, &S390_lowcore.os_info, sizeof(addr)))
|
|
goto fail;
|
|
if (addr == 0 || addr % PAGE_SIZE)
|
|
goto fail;
|
|
os_info_old = kzalloc(sizeof(*os_info_old), GFP_KERNEL);
|
|
if (!os_info_old)
|
|
goto fail;
|
|
if (copy_from_oldmem(os_info_old, (void *) addr, sizeof(*os_info_old)))
|
|
goto fail_free;
|
|
if (os_info_old->magic != OS_INFO_MAGIC)
|
|
goto fail_free;
|
|
if (os_info_old->csum != os_info_csum(os_info_old))
|
|
goto fail_free;
|
|
if (os_info_old->version_major > OS_INFO_VERSION_MAJOR)
|
|
goto fail_free;
|
|
os_info_old_alloc(OS_INFO_VMCOREINFO, 1);
|
|
os_info_old_alloc(OS_INFO_REIPL_BLOCK, 1);
|
|
pr_info("crashkernel: addr=0x%lx size=%lu\n",
|
|
(unsigned long) os_info_old->crashkernel_addr,
|
|
(unsigned long) os_info_old->crashkernel_size);
|
|
os_info_init = 1;
|
|
return;
|
|
fail_free:
|
|
kfree(os_info_old);
|
|
fail:
|
|
os_info_init = 1;
|
|
os_info_old = NULL;
|
|
}
|
|
|
|
/*
|
|
* Return pointer to os infor entry and its size
|
|
*/
|
|
void *os_info_old_entry(int nr, unsigned long *size)
|
|
{
|
|
os_info_old_init();
|
|
|
|
if (!os_info_old)
|
|
return NULL;
|
|
if (!os_info_old->entry[nr].addr)
|
|
return NULL;
|
|
*size = (unsigned long) os_info_old->entry[nr].size;
|
|
return (void *)(unsigned long)os_info_old->entry[nr].addr;
|
|
}
|
|
#endif
|