The hardware gets given a session context from userspace in each
submission, but if the session context changes the hardware wants
a FENCE to be emitted to know it can give up the current session.
IF a test submits interleaved session ctx access and uses a single
vulkan submit the hardware crashes, unless each IB is submitted
in a separate submission so the fence can be sent.
In theory it could be possible to construct a single command buffer
to trigger this so I do think the hardware should be smarter here.
Should this be fixed in the kernel to always emit a fence between
IBs?
Fixes: dEQP-VK.video.decode.h264_interleaved
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/23641>
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