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Commit ced3c42c authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86/iommu: Clean up the CONFIG_GART_IOMMU config option a bit 

Improve the explanation of this config option.

Cc: Andi Kleen <ak@linux.intel.com>
Cc: Borislav Petkov <borislav.petkov@amd.com>
Link: http://lkml.kernel.org/n/tip-gUMmysvsbl3mccbyf6olmxqg@git.kernel.org


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 38901f1c

arch/x86/Kconfig

+15 −9
Original line number Diff line number Diff line
@@ -760,15 +760,21 @@ config GART_IOMMU 
	select SWIOTLB

	depends on X86_64 && PCI && AMD_NB

	---help---

	  Support for full DMA access of devices with 32bit memory access only

	  on systems with more than 3GB. This is usually needed for USB,

	  sound, many IDE/SATA chipsets and some other devices.

	  Provides a driver for the older AMD Athlon64/Opteron/Turion/Sempron GART

	  based hardware IOMMU.

	  Newer systems typically have a better AMD IOMMU.

	  The code is only active when needed (enough memory and limited

	  device) unless CONFIG_IOMMU_DEBUG or iommu=force is specified

	  too.

	  Provides a driver for older AMD Athlon64/Opteron/Turion/Sempron

	  GART based hardware IOMMUs.



	  The GART supports full DMA access for devices with 32-bit access

	  limitations, on systems with more than 3 GB. This is usually needed

	  for USB, sound, many IDE/SATA chipsets and some other devices.



	  Newer systems typically have a modern AMD IOMMU, supported via

	  the CONFIG_AMD_IOMMU=y config option.



	  In normal configurations this driver is only active when needed:

	  there's more than 3 GB of memory and the system contains a

	  32-bit limited device.



	  If unsure, say Y.



config CALGARY_IOMMU

	bool "IBM Calgary IOMMU support"