On Thu, Nov 29, 2018 at 09:42:50AM -0500, Rob Clark wrote: > Maybe the thing we need to do is just implement a blacklist of > compatible strings for devices which should skip the automatic > iommu/dma hookup. Maybe a bit ugly, but it would also solve a problem > preventing us from enabling per-process pagetables for a5xx (where we > need to control the domain/context-bank that is allocated by the dma > api). You can detach from the dma map attachment using arm_iommu_detach_device, which a few drm drivers do, but I don't think this is the problem.
