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linux/Documentation/ABI/testing/sysfs-class-iommu-amd-iommu 

What:		/sys/class/iommu/<iommu>/amd-iommu/cap
Date:		June 2014
KernelVersion:	3.17
Contact:	Alex Williamson <[email protected]>
Description:
		IOMMU capability header as documented in the AMD IOMMU
		specification.  Format: %x

What:		/sys/class/iommu/<iommu>/amd-iommu/features
Date:		June 2014
KernelVersion:	3.17
Contact:	Alex Williamson <[email protected]>
Description:
		Extended features of the IOMMU.  Format: %llx