Timur Kristóf
7cb128ffb1
Add new preambles and postambles for synchronizing gang members in a gang submission using semaphores. These semaphores are both located in a small BO. Gang wait preambles: - gang leader writes 1 to a semaphore - gang member waits for it to be written When task shaders are used, make sure ACE waits until GFX starts to execute. Userspace is required to emit this wait to make sure it behaves correctly in a multi-process environment, because task shader dispatches are not meant to be executed on multiple compute engines at the same time. Gang wait postambles: - gang member writes 1 to a semaphore - gang leader waits for it to be written This ensures that the gang leader waits for the whole gang, which is necessary because the kernel signals the userspace fence as soon as the gang leader is done, which may lead to bugs because the same command buffers could be submitted again while still being executed. Signed-off-by: Timur Kristóf <timur.kristof@gmail.com> Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20010>
`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.