diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-12 11:15:12 +0900 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-11-12 11:15:12 +0900 |
| commit | 339a4b72c83dc7d8b29f43f7417add791e201ad3 (patch) | |
| tree | 7e1cf20b82fbe42ed96b246a86e0cccadb3912de /arch | |
| parent | dba538ff5610ee126e33a28fe713b3f108d31f2c (diff) | |
| parent | ced3c42c9fcba049ec9c76c8461ac194cafb20ba (diff) | |
Merge branch 'x86-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 iommu changes from Ingo Molnar:
"Make it easier to turn off the old AMD GART code"
* 'x86-iommu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/iommu: Clean up the CONFIG_GART_IOMMU config option a bit
x86/iommu: Don't make AMD_GART depend on EXPERT and default y
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/Kconfig | 27 |
1 files changed, 16 insertions, 11 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index dddba2663bbf..725e1573ea85 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -757,20 +757,25 @@ config DMI BIOS code. config GART_IOMMU - bool "GART IOMMU support" if EXPERT - default y + bool "Old AMD GART IOMMU support" 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 AMD Athlon64/Opteron/Turion/Sempron GART - based hardware IOMMU and a software bounce buffer based IOMMU used - on Intel systems and as fallback. - 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" |