Commit-ID: ced3c42c9fcba049ec9c76c8461ac194cafb20ba Gitweb: http://git.kernel.org/tip/ced3c42c9fcba049ec9c76c8461ac194cafb20ba Author: Ingo Molnar <mingo@xxxxxxxxxx> AuthorDate: Sun, 6 Oct 2013 11:45:20 +0200 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Sun, 6 Oct 2013 15:58:41 +0200 x86/iommu: Clean up the CONFIG_GART_IOMMU config option a bit Improve the explanation of this config option. Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx> Cc: Borislav Petkov <borislav.petkov@xxxxxxx> Link: http://lkml.kernel.org/n/tip-gUMmysvsbl3mccbyf6olmxqg@xxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- arch/x86/Kconfig | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index c9d2b81..7081958 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -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" -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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