path: root/arch/x86_64/Kconfig
diff options
authorJon Mason <jdmason@us.ibm.com>2006-06-26 13:58:14 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 10:48:19 -0700
commite465058d55a88feb4c7ecabe63eea7ea7147e206 (patch)
treed431ed689e072415915694eecdfbcb9304287f01 /arch/x86_64/Kconfig
parent0dc243ae10c8309c170a3af9f1adad1924a9f217 (diff)
[PATCH] x86_64: Calgary IOMMU - Calgary specific bits
This patch hooks Calgary into the build, the x86-64 IOMMU initialization paths, and introduces the Calgary specific bits. The implementation draws inspiration from both PPC (which has support for the same chip but requires firmware support which we don't have on x86-64) and gart. Calgary is different from gart in that it support a translation table per PHB, as opposed to the single gart aperture. Changes from previous version: * Addition of boot-time disablement for bus-level translation/isolation (e.g, enable userspace DMA for things like X) * Usage of newer IOMMU abstraction functions Signed-off-by: Muli Ben-Yehuda <muli@il.ibm.com> Signed-off-by: Jon Mason <jdmason@us.ibm.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/x86_64/Kconfig')
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/x86_64/Kconfig b/arch/x86_64/Kconfig
index e8c52a1eec06..ccc4a7fb97a3 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
+ 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