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

What:		/sys/class/iommu/<iommu>/devices/
Date:		June 2014
KernelVersion:	3.17
Contact:	Alex Williamson <[email protected]>
Description:
		IOMMU drivers are able to link devices managed by a
		given IOMMU here to allow association of IOMMU to
		device.

What:		/sys/devices/.../iommu
Date:		June 2014
KernelVersion:	3.17
Contact:	Alex Williamson <[email protected]>
Description:
		IOMMU drivers are able to link the IOMMU for a
		given device here to allow association of device to
		IOMMU.