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Kernel: Linux and AMD/Radeon Bits

Submitted by Roy Schestowitz on Tuesday 28th of September 2021 11:28:15 PM Filed under
Graphics/Benchmarks
Linux
  • Linux 5.16 To Expose AMD PSF Disable Bit To KVM Guests - Phoronix

    While the Linux kernel still hasn't added any formal control yet for AMD Predictive Store Forwarding to disable it short of also toggling Spectre V4 / SSBD, with the Linux 5.16 kernel the AMD PSF bit will now be exposed to KVM guest virtual machines so that they -- either with a patched/future kernel or for other operating systems -- may choose to toggle explicitly disable this AMD CPU feature.

    Predictive Store Forwarding is the Zen 3 feature in the name of performance that AMD provided a security analysis of earlier this year and the (small) possibility it could lead to incorrect CPU speculation. More than a half-year later, there still are no indications of any real-world attack on AMD PSF and the functionality remains enabled by default. But efforts to expose a PSF option for disabling it under Linux if so desired (aside from also engaging SSBD) have stalled.

  • RadeonSI Driver Merges NGG Improvements, Other Optimizations For Mesa 21.3 - Phoronix

    AMD open-source driver developers today merged another big set of patches providing various micro-optimizations and other enhancements to the RadeonSI Gallium3D driver.

    Ahead of Mesa 21.3 branching in a few weeks, the latest Mesa Git code saw a big set of patches today for the open-source RadeonSI driver. As with recent Mesa activity, there has been much work around SPECViewPerf/workstation optimizations and also further maturing the open-source driver's NGG (Next-Gen Geometry) handling.

  • AMD Posts Code Enabling "Cyan Skillfish" Display Support Due To Different DCN2 Variant - Phoronix

    ince July we've seen AMD open-source driver engineers posting code for "Cyan Skillfish" as an APU with Navi 1x graphics. While initial support for Cyan Skillfish was merged for Linux 5.15, it turns out the display code isn't yet wired up due to being a different DCN2 variant for its display block.

    Cyan Skillfish is in a bit of an odd position since its a Navi 1x RDNA APU where as other leaks/rumors showed AMD moving straight from the existing Vega-based APUs over to Navi 2x / RDNA2 and not matching with other road-map expectations... Especially with the AMDGPU Linux driver stack already busy preparing for Yellow Carp / Rembrandt and Van Gogh. Possibly pointing to Cyan Skillfish being more of a custom APU design is that it has slightly different display IP compared to existing RDNA/RDNA2 hardware.

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