From: Hans-Joachim Picht <hpicht@redhat.com>
Date: Fri, 16 Nov 2007 13:56:57 +0100
Subject: [s390] fix dump on panic for DASDs under LPAR
Message-id: 20071116125657.GP6053@redhat.com
O-Subject: [RHEL5 U2 PATCH 8/14] s390 - Fix dump on panic for DASDs under LPAR.
Bugzilla: 250352

Description
============

Currently the ccw method is used to ipl the DASD dump record under LPAR.
This mechanism is not reliable, which can cause dump failures. This fix
now uses the diag 308 ipl method for all machines, which have diag308
subcode 5 and 4 support.

Bugzilla
=========

BZ 250352
https://bugzilla.redhat.com/show_bug.cgi?id=250352

Upstream status of the patch:
=============================
Patch included in git as commit e3d3683d1402c1737687cb698451d545f57c32a7

Test status:
============
Kernel with patch was built and successfully tested

Please ACK.

With best regards,

Hans

diff --git a/arch/s390/kernel/ipl.c b/arch/s390/kernel/ipl.c
index 6537581..a06f364 100644
--- a/arch/s390/kernel/ipl.c
+++ b/arch/s390/kernel/ipl.c
@@ -589,6 +589,8 @@ static int dump_set_type(enum dump_type type)
 	case DUMP_TYPE_CCW:
 		if (MACHINE_IS_VM)
 			dump_method = DUMP_METHOD_CCW_VM;
+		else if (diag308_set_works)
+			dump_method = DUMP_METHOD_CCW_DIAG;
 		else
 			dump_method = DUMP_METHOD_CCW_CIO;
 		break;