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Starting with a750, the ALWAYS_ON counter is initialized from a loadable counter in CX power domain, which is never turned off except during a GPU reset. This means that timestamps should always be monotonic except if the GPU resets, in which case subsequent submits should return DEVICE_LOST anyway. Thus it should be good enough to satisfy the Vulkan requirement that vkCmdWriteTimestamp is monotonic. kgsl tries to synchronize the CX counter to the CPU counter, and additionally adds a synchronization ioctl to improve the accuracy. I'm not sure whether the former is really useful for us, but the latter should eventually be implemented in drm/msm. However for now we can expose the extension without any kernel support. Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/31100> |
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| _extra | ||
| _exts | ||
| ci | ||
| drivers | ||
| gallium | ||
| header-stubs | ||
| isl | ||
| mesa3d_theme | ||
| nir | ||
| relnotes | ||
| vulkan | ||
| amber.rst | ||
| android.rst | ||
| application-issues.rst | ||
| ARB_color_buffer_float.txt | ||
| bugs.rst | ||
| codingstyle.rst | ||
| conf.py | ||
| conform.rst | ||
| debugging.rst | ||
| devinfo.rst | ||
| dispatch.rst | ||
| download.rst | ||
| egl.rst | ||
| envvars.rst | ||
| extensions.rst | ||
| faq.rst | ||
| favicon.ico | ||
| favicon.svg | ||
| features.txt | ||
| gallium-nine.rst | ||
| gitlab-ci.yml | ||
| gpu-perf-tracing.rst | ||
| gpuvis.rst | ||
| helpwanted.rst | ||
| history.rst | ||
| index.rst | ||
| install.rst | ||
| isaspec.rst | ||
| libGL.txt | ||
| license.rst | ||
| lists.rst | ||
| macos.rst | ||
| meson.build | ||
| meson.rst | ||
| opengles.rst | ||
| osmesa.rst | ||
| perf.rst | ||
| perfetto.rst | ||
| precompiled.rst | ||
| README.UVD | ||
| README.VCE | ||
| release-calendar.csv | ||
| release-calendar.rst | ||
| release-maintainers-keys.asc | ||
| releasing.rst | ||
| relnotes.rst | ||
| repository.rst | ||
| rust.rst | ||
| rusticl.rst | ||
| shading.rst | ||
| sourcetree.rst | ||
| submittingpatches.rst | ||
| systems.rst | ||
| teflon.rst | ||
| u_trace.rst | ||
| utilities.rst | ||
| viewperf.rst | ||
| xlibdriver.rst | ||
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