AMD Stages Latest Radeon/AMDGPU Changes For Linux 4.21 Kernel

Written by Michael Larabel in Radeon on 14 November 2018 at 03:33 PM EST. 50 Comments
AMD has posted their initial set of AMDGPU driver changes slated to go into the future Linux 4.21 kernel by way of DRM-Next.

This is the first of likely two or three feature pull requests to DRM-Next for staging until the Linux 4.21 kernel cycle kicks off in the final days of 2018 or early 2019. Initial work includes:

- Support for the SDMA paging queue on Vega GPUs.

- Putting compute EOP buffers into vRAM as a performance optimization.

- Sharing more code between AMDGPU and the AMDKFD "Kernel Fusion Driver" compute code as part of the recent effort to unify these drivers.

- Support for scanout with DCC on Vega/GFX9 hardware.

- Initial kernel documentation on the "DC" display code.

- Updated SMU firmware support for GFX8 hardware.

- Reworking CSA handling in preparation for preemption support.

- PSP (Platform Security Processor) support for the xGMI interconnect for that PCIe alternative with Vega 20 hardware.

- Cleaned up RLC handling.

- Enabling GPU reset by default for Volcanis Islands and other hardware.

- Scheduler improvements for finding out if schedulers are ready for work and timeout/fault handling as part of the GPU recovery process.

The complete list of patches can be found via this pull request.
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Michael Larabel is the principal author of and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 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 automated benchmarking software. He can be followed via Twitter, LinkedIn, or contacted via

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