From: Joerg Roedel <joerg.roedel@amd.com>
Date: Fri, 22 May 2009 10:15:49 +0000 (+0200)
Subject: x86/iommu: add IOMMU_STRESS Kconfig entry
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=2be69c79e9a46a554fc3ff57d886e65e7a73eb72;p=deliverable%2Flinux.git

x86/iommu: add IOMMU_STRESS Kconfig entry

This Kconfig option is intended to enable various code paths or
parameters in IOMMU implementations to stress test the code and/or the
hardware. This can also be done by disabling optimizations in the code
when this option is switched on.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
---

diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 5865712d105d..33fac6bbe1c2 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -159,6 +159,14 @@ config IOMMU_DEBUG
 	  options. See Documentation/x86_64/boot-options.txt for more
 	  details.
 
+config IOMMU_STRESS
+	bool "Enable IOMMU stress-test mode"
+	---help---
+	  This option disables various optimizations in IOMMU related
+	  code to do real stress testing of the IOMMU code. This option
+	  will cause a performance drop and should only be enabled for
+	  testing.
+
 config IOMMU_LEAK
 	bool "IOMMU leak tracing"
 	depends on IOMMU_DEBUG && DMA_API_DEBUG