CONFIG_IOMMU_DMA (not configurable)

modulename: dma-iommu.ko

configname: CONFIG_IOMMU_DMA

Linux Kernel Configuration
└─>Device Drivers
└─>IOMMU Hardware Support
└─>IOMMU_DMA
In linux kernel since version 3.10 (release Date: 2013-06-30)  
source code:
drivers/iommu/dma-iommu.c