AMD IOMMU Version 2 driver

modulename: iommu_v2.ko

configname: CONFIG_AMD_IOMMU_V2

Linux Kernel Configuration
└─>Device Drivers
└─>IOMMU Hardware Support
└─>AMD IOMMU Version 2 driver
In linux kernel since version 3.1 (release Date: 2011-10-24)  
This option enables support for the AMD IOMMUv2 features of the IOMMU
hardware. Select this option if you want to use devices that support
the PCI PRI and PASID interface.

source code: