CONFIG_IOMMU_API (not configurable)

modulename: iommu.ko

and/or

iommu-traces.ko

and/or

iommu-sysfs.ko

configname: CONFIG_IOMMU_API

Linux Kernel Configuration
└─>Device Drivers
└─>IOMMU_API
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
source code:
drivers/iommu/iommu.c