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    SubjectRe: [Linaro-mm-sig] [RFC v2 1/2] dma-buf: Introduce dma buffer sharing mechanism
    > I still don't think that's possible. Please explain how you expect
    > to change the semantics of the streaming mapping API to allow multiple
    > mappers without having explicit serialization points that are visible
    > to all users. For simplicity, let's assume a cache coherent system

    I would agree. It's not just about barriers but in many cases where you
    have multiple mappings by hardware devices the actual hardware interface
    is specific to the devices. Just take a look at the fencing in TTM and
    the graphics drivers.

    Its not something the low level API can deal with, it requires high level
    knowledge.

    Alan


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