[Bug 779146] dmabuf: be able to negotiate tiled surfaces

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779146

--- Comment #57 from Daniel Stone <daniel at fooishbar.org> ---
> We also implement a dmabuf map check, thinking that a dmabuf may or may not be mappable. I'm still to find a non-mappable dmabuf in any upstream driver.

dmabufs you come across in the wild will generally be mappable. There are
explicit ioctls to manage CPU <-> device cache coherency:
https://cgit.freedesktop.org/drm/drm-tip/tree/include/uapi/linux/dma-buf.h#n25

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