cuXtra is a utility that provides some unrevealed functionalities of NVIDIA devices, including GPUs and DLA. cuXtra makes use of the CUDA export tables and specific driver ioctls.
cuXtra is currently closed-source and is only for learning and research purposes, not for commercial use.
If you're interested in its implementation, you can discuss it with the author (Weihang Shen, email: shenwhang@sjtu.edu.cn).