CONFIG_DMA_PERDEV_COHERENT is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_DMA_PERDEV_COHERENT (not configurable)

configname: CONFIG_DMA_PERDEV_COHERENT

Linux Kernel Configuration
└─>DMA_PERDEV_COHERENT
In linux kernel since version 4.1 (release Date: 2015-06-21)