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UMD Direct Submission "Proof Of Concept" For The Intel Xe Linux Driver

One of the interesting Intel Xe Linux kernel graphics driver patches that was volleyed for discussion last month is working on user-mode driver (UMD) direct submission support for allowing work to be directly submitted from user-space to the GPU hardware and avoiding some of the overhead of the kernel driver interactions.

This Intel Xe driver work is similar to the AMDGPU user direct submission work with user-mode queues as well as the Arm Panthor driver's user submission handling for letting the queue ring buffers be exposed directly to user-space. These request for comments (RFC) patches are also described as "possibly even a proof of concept" for user-mode direct submission support with the Xe driver. One idea that was discussed is a common user fence interface based around DRM syncobjs, which will likely be explored further as UMD engagement begins.

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