dynamic DMA-buf sharing between devices

[Chunming Zhou]

Thanks Christian, great job. I will verify it this week when I finish my 
current work on hand.

-David

在 2019/4/17 2:38, Christian König wrote:
> Hi everybody,
>
> core idea in this patch set is that DMA-buf importers can now provide an optional invalidate callback. Using this callback and the reservation object exporters can now avoid pinning DMA-buf memory for a long time while sharing it between devices.
>
> I've already send out an older version roughly a year ago, but didn't had time to further look into cleaning this up.
>
> The last time a major problem was that we would had to fix up all drivers implementing DMA-buf at once.
>
> Now I avoid this by allowing mappings to be cached in the DMA-buf attachment and so driver can optionally move over to the new interface one by one.
>
> This is also a prerequisite to my patchset enabling sharing of device memory with DMA-buf.
>
> Please review and/or comment,
> Christian.
>
>
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