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    SubjectRe: [PATCH v3 1/1] drm: msm: Replace dma_map_sg with dma_sync_sg*
    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.

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