mirror of https://gitlab.freedesktop.org/mesa/mesa
2c446b6636
When more than 8 registers are used, Midgard can only fit 64 threads in a thread group. For barriers to work properly, a threadgroup must fit an entire work group. The GL driver configures the hardware to have threadgroups the size of work groups. That means if more than 64 threads are used in a workgroup, and more than 8 registers are used, the hardware will fault spawning threads. To workaround this hardware limitation, we need to limit the number of work registers used depending on the size of the workgroup. Typically, the work group size is known at compile-time so that determination can usually be made without variants. To avoid variants, we make a pessimistic estimate in the case when it's not known at compile-time. shader-db shows 6 shaders affected. I expect that all of these would fault with DATA_INVALID_FAULT if they tried to execute before this patch, due to the oversize local size, and faulting is even slower than spilling ;-) Fixes dEQP-GLES31.functional.synchronization.* on Mali-T860. instructions HURT: shaders/android/gfxbench/carchase/6.shader_test MESA_SHADER_COMPUTE: 121 -> 157 (29.75%) instructions HURT: shaders/android/gfxbench/carchase/386.shader_test MESA_SHADER_COMPUTE: 121 -> 157 (29.75%) instructions HURT: shaders/android/gfxbench/carchase/374.shader_test MESA_SHADER_COMPUTE: 141 -> 184 (30.50%) instructions HURT: shaders/android/gfxbench/carchase/4-1.shader_test MESA_SHADER_COMPUTE: 141 -> 184 (30.50%) instructions HURT: shaders/android/com.miHoYo.GenshinImpact/18.shader_test MESA_SHADER_COMPUTE: 513 -> 933 (81.87%) instructions HURT: shaders/android/com.miHoYo.GenshinImpact/16.shader_test MESA_SHADER_COMPUTE: 505 -> 1002 (98.42%) bundles HURT: shaders/android/gfxbench/carchase/374.shader_test MESA_SHADER_COMPUTE: 73 -> 116 (58.90%) bundles HURT: shaders/android/gfxbench/carchase/4-1.shader_test MESA_SHADER_COMPUTE: 73 -> 116 (58.90%) bundles HURT: shaders/android/gfxbench/carchase/6.shader_test MESA_SHADER_COMPUTE: 61 -> 97 (59.02%) bundles HURT: shaders/android/gfxbench/carchase/386.shader_test MESA_SHADER_COMPUTE: 61 -> 97 (59.02%) bundles HURT: shaders/android/com.miHoYo.GenshinImpact/18.shader_test MESA_SHADER_COMPUTE: 281 -> 701 (149.47%) bundles HURT: shaders/android/com.miHoYo.GenshinImpact/16.shader_test MESA_SHADER_COMPUTE: 278 -> 775 (178.78%) registers helped: shaders/android/gfxbench/carchase/374.shader_test MESA_SHADER_COMPUTE: 11 -> 8 (-27.27%) registers helped: shaders/android/gfxbench/carchase/4-1.shader_test MESA_SHADER_COMPUTE: 11 -> 8 (-27.27%) registers helped: shaders/android/gfxbench/carchase/6.shader_test MESA_SHADER_COMPUTE: 14 -> 8 (-42.86%) registers helped: shaders/android/gfxbench/carchase/386.shader_test MESA_SHADER_COMPUTE: 14 -> 8 (-42.86%) registers helped: shaders/android/com.miHoYo.GenshinImpact/16.shader_test MESA_SHADER_COMPUTE: 16 -> 8 (-50.00%) registers helped: shaders/android/com.miHoYo.GenshinImpact/18.shader_test MESA_SHADER_COMPUTE: 16 -> 8 (-50.00%) threads helped: shaders/android/gfxbench/carchase/6.shader_test MESA_SHADER_COMPUTE: 1 -> 2 (100.00%) threads helped: shaders/android/gfxbench/carchase/386.shader_test MESA_SHADER_COMPUTE: 1 -> 2 (100.00%) threads helped: shaders/android/gfxbench/carchase/374.shader_test MESA_SHADER_COMPUTE: 1 -> 2 (100.00%) threads helped: shaders/android/gfxbench/carchase/4-1.shader_test MESA_SHADER_COMPUTE: 1 -> 2 (100.00%) threads helped: shaders/android/com.miHoYo.GenshinImpact/16.shader_test MESA_SHADER_COMPUTE: 1 -> 2 (100.00%) threads helped: shaders/android/com.miHoYo.GenshinImpact/18.shader_test MESA_SHADER_COMPUTE: 1 -> 2 (100.00%) spills HURT: shaders/android/gfxbench/carchase/374.shader_test MESA_SHADER_COMPUTE: 0 -> 5 spills HURT: shaders/android/gfxbench/carchase/4-1.shader_test MESA_SHADER_COMPUTE: 0 -> 5 spills HURT: shaders/android/gfxbench/carchase/6.shader_test MESA_SHADER_COMPUTE: 0 -> 8 spills HURT: shaders/android/gfxbench/carchase/386.shader_test MESA_SHADER_COMPUTE: 0 -> 8 spills HURT: shaders/android/com.miHoYo.GenshinImpact/18.shader_test MESA_SHADER_COMPUTE: 0 -> 112 spills HURT: shaders/android/com.miHoYo.GenshinImpact/16.shader_test MESA_SHADER_COMPUTE: 0 -> 146 fills HURT: shaders/android/gfxbench/carchase/6.shader_test MESA_SHADER_COMPUTE: 0 -> 26 fills HURT: shaders/android/gfxbench/carchase/386.shader_test MESA_SHADER_COMPUTE: 0 -> 26 fills HURT: shaders/android/gfxbench/carchase/374.shader_test MESA_SHADER_COMPUTE: 0 -> 33 fills HURT: shaders/android/gfxbench/carchase/4-1.shader_test MESA_SHADER_COMPUTE: 0 -> 33 fills HURT: shaders/android/com.miHoYo.GenshinImpact/18.shader_test MESA_SHADER_COMPUTE: 0 -> 209 fills HURT: shaders/android/com.miHoYo.GenshinImpact/16.shader_test MESA_SHADER_COMPUTE: 0 -> 234 total instructions in shared programs: 1521691 -> 1522766 (0.07%) instructions in affected programs: 1542 -> 2617 (69.71%) helped: 0 HURT: 6 HURT stats (abs) min: 36.0 max: 497.0 x̄: 179.17 x̃: 43 HURT stats (rel) min: 29.75% max: 98.42% x̄: 50.13% x̃: 30.50% 95% mean confidence interval for instructions value: -49.36 407.69 95% mean confidence interval for instructions %-change: 17.14% 83.12% Inconclusive result (value mean confidence interval includes 0). total bundles in shared programs: 649296 -> 650371 (0.17%) bundles in affected programs: 827 -> 1902 (129.99%) helped: 0 HURT: 6 HURT stats (abs) min: 36.0 max: 497.0 x̄: 179.17 x̃: 43 HURT stats (rel) min: 58.90% max: 178.78% x̄: 94.01% x̃: 59.02% 95% mean confidence interval for bundles value: -49.36 407.69 95% mean confidence interval for bundles %-change: 36.20% 151.83% Inconclusive result (value mean confidence interval includes 0). total registers in shared programs: 90681 -> 90647 (-0.04%) registers in affected programs: 82 -> 48 (-41.46%) helped: 6 HURT: 0 helped stats (abs) min: 3.0 max: 8.0 x̄: 5.67 x̃: 6 helped stats (rel) min: 27.27% max: 50.00% x̄: 40.04% x̃: 42.86% 95% mean confidence interval for registers value: -8.03 -3.30 95% mean confidence interval for registers %-change: -50.95% -29.13% Registers are helped. total threads in shared programs: 55717 -> 55723 (0.01%) threads in affected programs: 6 -> 12 (100.00%) helped: 6 HURT: 0 helped stats (abs) min: 1.0 max: 1.0 x̄: 1.00 x̃: 1 helped stats (rel) min: 100.00% max: 100.00% x̄: 100.00% x̃: 100.00% 95% mean confidence interval for threads value: 1.00 1.00 95% mean confidence interval for threads %-change: 100.00% 100.00% Threads are helped. total spills in shared programs: 1108 -> 1392 (25.63%) spills in affected programs: 0 -> 284 helped: 0 HURT: 6 total fills in shared programs: 4721 -> 5282 (11.88%) fills in affected programs: 0 -> 561 helped: 0 HURT: 6 Cc: mesa-stable Closes: #7228 Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19092> |
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README.rst
`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.