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iris: Check data offset alignment for copy_mem_mem

Robert Tarasov requested to merge tutankhamen/mesa:br_check_align into main

Check both source and destination data offsets are aligned for iris_copy_mem_mem (MI_COPY_MEM_MEM operates on DWords). This patch fixes dEQP-GLES{2|3}.functional.buffer.write.random.* tests failures while run on guest side with virgl.

Fixes: 9b1b9714 ("iris: Use MI_COPY_MEM_MEM for tiny resource_copy_region calls.") Cc: Reviewed-by: Lionel Landwerlin Reviewed-by: Marcin Ślusarz

Edited by Robert Tarasov

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