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7681500ead
(ported from iris - airlied)
The MI_COPY_MEM_MEM version of resource_copy_region has known bugs:
It's failing to set valid_buffer_range correctly
It's missing iris_emit_buffer_barrier_for() for the source/destination, so there may be missing flushes.
There are some bad interactions with the tile cache and VF using L3.
Even with those fixed, if you expand the "no more than 16 bytes" restriction to allow copies up to 1024 bytes, then it starts failing Piglit tests on Icelake.
We could probably fix this. However, I had originally only measured a 0.689096% +/- 0.473968% (n=4) speedup in Shadow of Mordor's OpenGL port, which is already fairly small, especially before adding missing flushes. Further, some of that likely came from not switching between render and compute...which we'll soon be able to avoid thanks to BLOCS.
Folks were also worried that MI_COPY_MEM_MEM can't be pipelined, and that stalling the command streamer may actually slow things down, especially as the GPUs become more powerful. We aren't really sure about this, but it's another concern.
So, let's just get rid of this optimization. It seemed like a good idea at the time, but it's just causing issues for very little gain.
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13374>
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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.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.