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 5865712..33fac6b 100644 (file)
--- 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