diff options
Diffstat (limited to 'arch/x86_64/Kconfig')
| -rw-r--r-- | arch/x86_64/Kconfig | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig index e8c52a1eec0..ccc4a7fb97a 100644 --- a/arch/x86_64/Kconfig +++ b/arch/x86_64/Kconfig @@ -405,6 +405,25 @@ config IOMMU device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified too. +config CALGARY_IOMMU + bool "IBM Calgary IOMMU support" + default y + select SWIOTLB + depends on PCI && EXPERIMENTAL + help + Support for hardware IOMMUs in IBM's xSeries x366 and x460 + systems. Needed to run systems with more than 3GB of memory + properly with 32-bit PCI devices that do not support DAC + (Double Address Cycle). Calgary also supports bus level + isolation, where all DMAs pass through the IOMMU. This + prevents them from going anywhere except their intended + destination. This catches hard-to-find kernel bugs and + mis-behaving drivers and devices that do not use the DMA-API + properly to set up their DMA buffers. The IOMMU can be + turned off at boot time with the iommu=off parameter. + Normally the kernel will make the right choice by itself. + If unsure, say Y. + # need this always selected by IOMMU for the VIA workaround config SWIOTLB bool |