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Commit 5d05f4de authored by Jon Mason's avatar Jon Mason Committed by Linus Torvalds
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[PATCH] x86_64: Make GART_IOMMU kconfig help text more specific (trivial) 



Have the GART_IOMMU help text specify that this is the hardware IOMMU in
amd64 processors.  This will be significant if/when other IOMMUs are
added to the x86-64 architecture. :-)

Also, note that the previous help text stated that IOMMU was needed for
>3GB memory instead of >4GB.  This is fixed in the newer version.

Signed-off-by: default avatarJon Mason <jdmason@us.ibm.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent ba22f135

arch/x86_64/Kconfig

+9 −7
Original line number Diff line number Diff line
@@ -364,13 +364,15 @@ config GART_IOMMU 
	select SWIOTLB

	depends on PCI

	help

	  Support the IOMMU. Needed to run systems with more than 3GB of memory

	  properly with 32-bit PCI devices that do not support DAC (Double Address

	  Cycle). The IOMMU can be turned off at runtime with the iommu=off parameter.

	  Support for hardware IOMMU in AMD's Opteron/Athlon64 Processors

	  and for the bounce buffering software IOMMU.

	  Needed to run systems with more than 3GB of memory properly with

	  32-bit PCI devices that do not support DAC (Double Address Cycle).

	  The IOMMU can be turned off at runtime with the iommu=off parameter.

  	  Normally the kernel will take the right choice by itself.

	  This option includes a driver for the AMD Opteron/Athlon64 northbridge IOMMU

	  and a software emulation used on other systems.

	  If unsure, say Y.

  	  This option includes a driver for the AMD Opteron/Athlon64 IOMMU

  	  northbridge and a software emulation used on other systems without

	  hardware IOMMU.  If unsure, say Y.



# need this always enabled with GART_IOMMU for the VIA workaround

config SWIOTLB