Chia-I Wu
5ae953b5e9
amdgpu enables gfxoff by default and the feature resets the RLC clock counter on idle on raven/raven2. Querying AMDGPU_INFO_TIMESTAMP does not work as expected on those platforms. There was an attempt in amdgpu to read from the TSC register instead, but it did not work without a firmware update[1]. Another possible solution is to disable the clock counter reset by clearing AMD_PG_SUPPORT_RLC_SMU_HS, but that causes a 0.2W increase of power consumption on idle which is undesirable. The clock counter reset affects vkCmdWriteTimestamp as well. The spec is vague on whether that is allowed or not. The WG is aware of the issue[2] but never really addresses it. [1] https://lists.freedesktop.org/archives/amd-gfx/2023-May/093731.html [2] https://github.com/KhronosGroup/Vulkan-Docs/issues/216 Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23481>
`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.rst <https://mesa3d.org/install.html>`_), but the recommended way is to use Meson (`docs/meson.rst <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 `OFTC's #dri-devel <irc://irc.oftc.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.rst <https://mesa3d.org/bugs.html>`_). Contributing ------------ Contributions are welcome, and step-by-step instructions can be found in our documentation (`docs/submittingpatches.rst <https://mesa3d.org/submittingpatches.html>`_). Note that Mesa uses gitlab for patches submission, review and discussions.