Files
mesa/docs
Connor Abbott dbc4a2e30b tu: Initial support for VK_KHR_calibrated_timestamps on a750
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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