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If a CPU job comes first in a command buffer with a semaphore wait operation we need to wait on the CPU for the semaphore to be signaled before we process the job. We have been doing this with a WaitForIdle operation, but that only works if the semaphore has been submitted for signaling from the same instance of the driver. If we have an imported payload from another instance in our semaphore however, waitForIdle may return too early since the submission to signal the semaphore may have been submitted by a different instance of the driver as well, and our wait for idle checks only know about this instance submissions. To fix this, we always submit a noop job from our instance that waits on the semaphores on the GPU and follow up with WaitForIdle to wait for that to complete. Fixes test failures and/or assert crashes in: dEQP-VK.synchronization.cross_instance.* (when enabling support for semaphore imports) Reviewed-by: Melissa Wen <mwen@igalia.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/15342> |
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