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[S390] kdump backend code

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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>
This commit is contained in:
Michael Holzheu
2011-10-30 15:16:40 +01:00
committed by Martin Schwidefsky
parent 7f0bf656c6
commit 60a0c68df2
19 changed files with 1080 additions and 14 deletions
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19
arch/s390/kernel/smp.c
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@ -38,6 +38,7 @@
#include <linux/timex.h>
#include <linux/bootmem.h>
#include <linux/slab.h>
#include <linux/crash_dump.h>
#include <asm/asm-offsets.h>
#include <asm/ipl.h>
#include <asm/setup.h>
@ -304,11 +305,13 @@ void smp_ctl_clear_bit(int cr, int bit)
}
EXPORT_SYMBOL(smp_ctl_clear_bit);
#ifdef CONFIG_ZFCPDUMP
#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_CRASH_DUMP)
static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu)
{
if (ipl_info.type != IPL_TYPE_FCP_DUMP)
if (ipl_info.type != IPL_TYPE_FCP_DUMP && !OLDMEM_BASE)
return;
if (is_kdump_kernel())
return;
if (cpu >= NR_CPUS) {
pr_warning("CPU %i exceeds the maximum %i and is excluded from "
@ -426,6 +429,18 @@ static void __init smp_detect_cpus(void)
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (!info)
panic("smp_detect_cpus failed to allocate memory\n");
#ifdef CONFIG_CRASH_DUMP
if (OLDMEM_BASE && !is_kdump_kernel()) {
struct save_area *save_area;
save_area = kmalloc(sizeof(*save_area), GFP_KERNEL);
if (!save_area)
panic("could not allocate memory for save area\n");
copy_oldmem_page(1, (void *) save_area, sizeof(*save_area),
0x200, 0);
zfcpdump_save_areas[0] = save_area;
}
#endif
/* Use sigp detection algorithm if sclp doesn't work. */
if (sclp_get_cpu_info(info)) {
smp_use_sigp_detection = 1;