When looking at a pair of GPU writes, where we want to make sure that
the clean cacheline is invalidated automatically, we want to reuse that
cacheline whilst we know it remains valid (i.e. repeat the test using a
new value to the same location).
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Since the value in the bo may be altered by the test, we only want to
repeat phases of the test to avoid breaking the test itself.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Alternate between two values written by the GPU so that we can look for
stale cachelines without having to overwrite the value with the CPU.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
A basic check that the execbuf flushes writes from the batch and that
they are coherent afterwards.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
