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test/amdgpu: Add emit mem sync flag for test IB

Jinzhou Su requested to merge Joe_jinzhou/drm:master into master

In syncobj test, 3 threads will be created. Sometimes the first gfx IB and the third sdma IB will use same physical page. There will be risk that sdma engine will read gfx IB in the same physical page. So better to flush the cache before commit the sdma IB.

Signed-off-by: Jinzhou Su Jinzhou.Su@amd.com

Reviewed-by: Huang Rui ray.huang@amd.com

Acked-by: Alex Deucher alexander.deucher@amd.com

Edited by Jinzhou Su

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