AMD IOMMU support

modulename: amd_iommu_init.ko

configname: CONFIG_AMD_IOMMU

Linux Kernel Configuration
└─>Processor type and features
└─>AMD IOMMU support
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
With this option you can enable support for AMD IOMMU hardware in
your system. An IOMMU is a hardware component which provides
remapping of DMA memory accesses from devices. With an AMD IOMMU you
can isolate the the DMA memory of different devices and protect the
system from misbehaving device drivers or hardware.

You can find out if your system has an AMD IOMMU if you look into
your BIOS for an option to enable it or if you have an IVRS ACPI
table.

source code:
selects
CONFIG_SWIOTLB
CONFIG_PCI_MSI

depends
CONFIG_ACPI
CONFIG_PCI
CONFIG_X86_64

is selected by
CONFIG_AMD_IOMMU_STATS