linux-kernel - [RFC PATCH 10/10] fadump: Introduce config option for firmware assisted dump feature

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Date:	Wed, 13 Jul 2011 23:38:46 +0530
From:	Mahesh J Salgaonkar <mahesh@...ux.vnet.ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Cc:	Michael Ellerman <michael@...erman.id.au>,
	Haren Myneni <hbabu@...ibm.com>,
	Anton Blanchard <anton@...ba.org>,
	Milton Miller <miltonm@....com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [RFC PATCH 10/10] fadump: Introduce config option for firmware
	assisted dump feature

From: Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>

This patch introduces a new config option CONFIG_FA_DUMP for firmware
assisted dump feature on Powerpc (ppc64) architecture.

Signed-off-by: Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>
---
 arch/powerpc/Kconfig |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 2729c66..a424ad3 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -376,6 +376,19 @@ config PHYP_DUMP
 
 	  If unsure, say "N"
 
+config FA_DUMP
+	bool "Firmware-assisted dump"
+	depends on PPC64 || PPC_RTAS || CRASH_DUMP
+	help
+	  A robust mechanism to get reliable kernel crash dump with
+	  assistance from firmware. This approach does not use kexec,
+	  instead firmware assists in booting the kdump kernel
+	  while preserving memory contents. Firmware-assisted dump
+	  is meant to be a kdump replacement offering robustness and
+	  speed not possible without system firmware assistance.
+
+	  If unsure, say "N"
+
 config PPCBUG_NVRAM
 	bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
 	default y if PPC_PREP

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