ELC + ABS

In the Linux kernel, DMA controllers are handled through a framework called DMAEngine, which provides an API for other device drivers to perform DMA transfers. While this framework is critical to some drivers and use cases, it is also fairly obscure and under-documented.

This talk aims at giving an overview of this kernel framework, using the knowledge gathered during the development of a DMAEngine driver for the Allwinner ARM processors and the writing kernel documentation for this subsystem. We will see the main aspects of it, the different features and the recent developments in this framework.