a07d06f103
We use a mix of MI & PIPE_CONTROL commands to write our queries' data
(results & availability). Those commands' memory write order is not
guaranteed with regard to their order in the command stream, unless CS
stalls are inserted between them. This is problematic for 2 reasons :
1. We copy results from the device using MI commands even though
the values are generated from PIPE_CONTROL, meaning we could
copy unlanded values into the results and then copy the
availability that is inconsistent with the values.
2. We allow the user to poll on the availability values of the
query pool from the CPU. If the availability lands in memory
before the values then we could return invalid values.
This change does 2 things to address this problem :
- We use either PIPE_CONTROL or MI commands to write both
queries values and availability, so that the ordering of the
memory writes guarantees that if availability is visible,
results are also visible.
- For the occlusion & timestamp queries we apply a CS stall
before copying the results on the device, to ensure copying
with MI commands see the correct values of previous
PIPE_CONTROL writes of availability (required by the Vulkan
spec).
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reported-by: Iago Toral Quiroga <itoral@igalia.com>
Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
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