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Graphics: Intel, AMD and Zink

Submitted by Roy Schestowitz on Thursday 14th of January 2021 07:48:21 PM Filed under
Graphics/Benchmarks
  • Intel Sends In Another Batch Of Graphics Work For Linux 5.12 - More Display Fixes - Phoronix

    At the start of the month Intel sent out their initial graphics driver changes targeting Linux 5.12 while now a secondary set of changes have been sent to DRM-Next.

    That initial pull included restoring Tiger Lake Gen12 frame-buffer compression, HDR display support for select Intel Gen9 graphics hardware support, atomic mode-setting improvements for Big Joiner, and other changes.

  • AMDGPU Working On "Secure Display" Functionality - Phoronix

    The AMD Radeon "AMDGPU" open-source Linux kernel driver is tacking on another new feature: Secure Display TA.

    Over the past two years we have seen AMD Linux driver developers work on more "security" features that at least initially appeared to be driven by AMD picking up Chromebook design wins and needing to support this functionality for those use-cases. There has been HDCP display support for APUs to land as well as Trusted Memory Zones - TMZ for securing video memory buffers. The latest feature being tackled is "Secure Display TA".

  • Mike Blumenkrantz: Overhead

    As in all software, overhead is the performance penalty that is incurred as compared to a baseline measurement. In Mesa, a lot of people know of driver overhead as “Gallium sucks” and/or “A Gallium-based driver is slow” due to the fact that Gallium does incur some amount of overhead as compared to the old-style immediate mode DRI drivers.

    While it’s true that there is an amount of performance lost by using Gallium in this sense, it’s also true that the performance gained is much greater. The reason for this is that Gallium is able to batch commands and state changes for every driver using it, allowing redundant calls to avoid triggering any work in the GPU.

    It also makes for an easier time profiling and improving upon the CPU usage that’s required to handle the state changes emitted by Gallium. Instead of having a ton of core Mesa callbacks which need to be handled, each one potentially leading to a no-op that can be analyzed and deferred by the driver, Gallium provides a more cohesive API where each driver hook is a necessary change that must be handled. Because of this, the job of optimizing for those changes is simplified.

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