The allocation logic of the SPI does not take into account compute
user thread management settings for masking CUs with the exception of
skipping fully disabled SEs. This means that occupancy limited
dispatches such as cooperative launch may over allocate onto hardware
resources that are not immediately available, resulting in a potential
barrier logic hang as occupying work groups are waiting on enqueued
work groups to reach the barrier.
Further work will have to be done to get the per-SA CU enablement count
from the KFD in order to correctly clip the cooperative CU limit based
on the CU mask, which will require breaking the current ABI.
For now, report that cooperative launch is not supported while a CU
mask has been applied to prevent potential shader hangs.
Change-Id: I8be4bb47d65ceb62d805f36ef6ef3996d756021f
Jonathan Kim
2b75a73ce7