[Bug 768794] ion: DMA Buf allocator based on ion

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=768794

--- Comment #23 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
I think we need to ask ourself what we want to do. Turning an ION allocation
into a DMABuf FD is cheap and make the exchange very generic. So for that case,
it should sublclass DMABuf allocator. Note, I didn't add any vfunc, if needed
we can fix that. In general, I don't think it's needed.

Exposing the ION handles would probably be different, I'm not sure how those
handles works really. Also, I don't have any plan yet how to handle mutable
memory. So far they are all mutable to DMABuf so it make sense to just expose
the dmabuf.

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