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[S390] Add vmpanic parameter. 

Implementation of new kernel parameter vmpanic that provides a means to
perform a z/VM CP command after a kernel panic occurred.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Peter Oberparleiter 2006-06-29 15:08:25 +02:00 committed by Martin Schwidefsky
parent 405455734e
commit 585c3047a8
2 changed files with 41 additions and 2 deletions
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9
Documentation/kernel-parameters.txt
View File

@ -1689,9 +1689,14 @@ running once the system is up.
decrease the size and leave more room for directly
mapped kernel RAM.
vmhalt= [KNL,S390]
vmhalt= [KNL,S390] Perform z/VM CP command after system halt.
Format: <command>
vmpoff= [KNL,S390]
vmpanic= [KNL,S390] Perform z/VM CP command after kernel panic.
Format: <command>
vmpoff= [KNL,S390] Perform z/VM CP command after power off.
Format: <command>
waveartist= [HW,OSS]
Format: <io>,<irq>,<dma>,<dma2>

34
arch/s390/kernel/setup.c
View File

@ -37,6 +37,7 @@
#include <linux/seq_file.h>
#include <linux/kernel_stat.h>
#include <linux/device.h>
#include <linux/notifier.h>
#include <asm/uaccess.h>
#include <asm/system.h>
@ -115,6 +116,7 @@ void __devinit cpu_init (void)
*/
char vmhalt_cmd[128] = "";
char vmpoff_cmd[128] = "";
char vmpanic_cmd[128] = "";
static inline void strncpy_skip_quote(char *dst, char *src, int n)
{
@ -146,6 +148,38 @@ static int __init vmpoff_setup(char *str)
__setup("vmpoff=", vmpoff_setup);
static int vmpanic_notify(struct notifier_block *self, unsigned long event,
void *data)
{
if (MACHINE_IS_VM && strlen(vmpanic_cmd) > 0)
cpcmd(vmpanic_cmd, NULL, 0, NULL);
return NOTIFY_OK;
}
#define PANIC_PRI_VMPANIC 0
static struct notifier_block vmpanic_nb = {
.notifier_call = vmpanic_notify,
.priority = PANIC_PRI_VMPANIC
};
static int __init vmpanic_setup(char *str)
{
static int register_done __initdata = 0;
strncpy_skip_quote(vmpanic_cmd, str, 127);
vmpanic_cmd[127] = 0;
if (!register_done) {
register_done = 1;
atomic_notifier_chain_register(&panic_notifier_list,
&vmpanic_nb);
}
return 1;
}
__setup("vmpanic=", vmpanic_setup);
/*
* condev= and conmode= setup parameter.
*/