Michael Cree and I have been debugging FDO bug 26403 [1]. I tried booting with `radeon.test=1` and found this, which I think is related:
> [drm] Tested GTT->VRAM and VRAM->GTT copy for GTT offset 0x202000 > [drm] Tested GTT->VRAM and VRAM->GTT copy for GTT offset 0x302000 [snip] > [drm] Tested GTT->VRAM and VRAM->GTT copy for GTT offset 0xfd02000 > [drm] Tested GTT->VRAM and VRAM->GTT copy for GTT offset 0xfe02000 > pci_map_single failed: could not allocate dma page tables > [drm:radeon_ttm_backend_bind] *ERROR* failed to bind 128 pages at 0x0FF02000 > [TTM] Couldn't bind backend. > radeon 0000:00:07.0: object_init failed for (1048576, 0x00000002) > [drm:radeon_test_moves] *ERROR* Failed to create GTT object 253 > Error while testing BO move.
