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Commit 585c3047 authored by Peter Oberparleiter's avatar Peter Oberparleiter Committed by Martin Schwidefsky
Browse files

[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: default avatarPeter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 40545573

Documentation/kernel-parameters.txt

+7 −2
Original line number Diff line number Diff line
@@ -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>

arch/s390/kernel/setup.c

+34 −0
Original line number Diff line number Diff line
@@ -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.

 */