(In reply to comment #55)
> Do the messages like "[  124.822006] [drm] Tested GTT->VRAM and VRAM->GTT
> copy for GTT offset 0x3fe98000" and "[  124.822010] [drm] Testing syncing
> between rings 1 and 0..." mean that the test are actually passed ?

Yes the DMA actually seems to work when used for buffer moves.

The second message is from the second test which tries semaphore sync between
the different engines.

What the last message logged when you try to load the module?

Also please try radeon.test=1 and radeon.test=2 separately.