PLX ExpressLane PEX Switch DMA Engine Support

modulename: plx_dma.ko

configname: CONFIG_PLX_DMA

Linux Kernel Configuration
└─>Device Drivers
└─>DMA Engine support
└─>PCI support
└─>PLX ExpressLane PEX Switch DMA Engine Support
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Some PLX ExpressLane PCI Switches support additional DMA engines.
These are exposed via extra functions on the switch's
upstream port. Each function exposes one DMA channel.

source code: