DRM Render Nodes For Linux Move Close To Rendering
Written by Michael Larabel in Linux Kernel on 23 August 2013 at 01:04 PM EDT. 1 Comment
David Herrmann continues his GSoC summer project of implementing DRM Render Nodes support and as part of that VMA Access Management for the Linux kernel.

Herrmann, the developer known for his DRM terminal emulator work in the past and other projects for killing the Linux kernel console, has been hard at work on the render nodes initiative.

This render/mode-set node work comes down to allowing GPGPU compute support without needing a compositor/display active along with being able to perform multi-seat computing off a single display controller and efficient compositor stacking. The work basically comes down to splitting up the kernel drivers' mode-setting and rendering interfaces.

Back in July were some early patches by David for managing this feat while today he's published the second version of these kernel patches to the DRM subsystem.

The v2 patches reduce the VMA Access Management changes while integrating nicely for both TTM and GEM drivers, With the patches, drm.rnodes=1 must be set as a kernel parameter for enabling render-nodes or adjusting sysfs, at which point render-nodes will be created when loading the supported DRM drivers (Radeon / Intel / Nouveau) and thus can toy with the render-node API.
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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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