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Midgard supports two modes of operation, 32-bit mode and 64-bit mode. The GPU is natively 64-bit, but job descriptors can be submitted in 32-bit mode. Among other changes, 32-bit mode shortens pointer sizes to use 32-bit pointers rather than the full 64-bit range. The blob decides which mode to use based on the CPU bitness, so an armhf system uses 32-bit descriptors and an aarch64 system uses 64-bit descriptors. For a while, we mimicked this, bu inevitably this caused the 32-bit support to lag behind as our reference platform is 64-bit. To combat the code staleness, we traced an older GPU paired with a 64-bit CPU (the Midgard T720 on-board the sunxi H64). From there, we could tell which fields were really about hardware and which fields were simply reflections of the descriptor bitness. From there, we decided to remove support for 32-bit descriptors entirely, using 64-bit descriptors unconditionally. There is minimal performance penalty for this in practice, and it allows us to unify these disparate code paths. This fixes: - T860 + armhf - T820 + armhf - T760 + aarch64 And will help bringup of 1st/2nd generation Midgard regardless of CPU. [Work done by Tomeu. Commit message written by Alyssa.] v2: Add comments preserving information about the old behaviour for future reference. Fix a compiler warning. (Alyssa) Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com> |
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`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library ====================================================== Source ------ This repository lives at https://gitlab.freedesktop.org/mesa/mesa. Other repositories are likely forks, and code found there is not supported. Build & install --------------- You can find more information in our documentation (`docs/install.html <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.html <https://mesa3d.org/meson.html>`_): .. code-block:: sh $ mkdir build $ cd build $ meson .. $ sudo ninja install Support ------- Many Mesa devs hang on IRC; if you're not sure which channel is appropriate, you should ask your question on `Freenode's #dri-devel <irc://chat.freenode.net#dri-devel>`_, someone will redirect you if necessary. Remember that not everyone is in the same timezone as you, so it might take a while before someone qualified sees your question. To figure out who you're talking to, or which nick to ping for your question, check out `Who's Who on IRC <https://dri.freedesktop.org/wiki/WhosWho/>`_. The next best option is to ask your question in an email to the mailing lists: `mesa-dev\@lists.freedesktop.org <https://lists.freedesktop.org/mailman/listinfo/mesa-dev>`_ Bug reports ----------- If you think something isn't working properly, please file a bug report (`docs/bugs.html <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.html <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses email mailing-lists for patches submission, review and discussions.