Freedreno Works On Context Priority Support, Plumbs Into Gallium3D
Written by Michael Larabel in Mesa on 25 October 2017 at 05:59 AM EDT. 3 Comments
MESA --
There's been a theme recently with the open-source graphics drivers of working on priority scheduling support from AMDGPU priority scheduling for VR use-cases and tied into RADV to Intel also allowing context priority support that in turn is exposed through EGL. The Freedreno driver has also been working on a context priority implementation.

Rob Clark of the Freedreno project this week posted new patches for implementing context priority support for his Gallium3D driver with supported Qualcomm Adreno hardware and on a supported kernel with the MSM DRM code. The work also includes some generic Gallium3D plumbing for adding a new capability for drivers that want to expose per-context priorities. This Gallium3D driver implementation allows for low, medium, and high context priorities or for all non-Freedreno drivers right now just doesn't expose the cap.

Only with Freedreno for now it's wired in. For now he hasn't plumbed this context priority support to any EGL extension or the like but for now can be tested with the FD_MESA_DEBUG=hiprio environment variable if wanting to give a particular OpenGL application higher priority over the rest of the graphics work.

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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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