[PATCH] drm/udl: avoid swiotlb for imported vmap buffers.

[Daniel Vetter]

On Mon, May 06, 2013 at 10:35:35AM +1000, Dave Airlie wrote:
> >>
> >> However if we don't set a dma mask on the usb device, the mapping
> >> ends up using swiotlb on machines that have it enabled, which
> >> is less than desireable.
> >>
> >> Signed-off-by: Dave Airlie <airlied at redhat.com>
> >
> > Fyi for everyone else who was not on irc when Dave&I discussed this:
> > This really shouldn't be required and I think the real issue is that
> > udl creates a dma_buf attachement (which is needed for device dma
> > only), but only really wants to do cpu access through vmap/kmap. So
> > not attached the device should be good enough. Cc'ing a few more lists
> > for better fyi ;-)
> 
> Though I've looked at this a bit more, and since I want to be able to expose
> shared objects as proper GEM objects from the import side I really
> need that list of pages.

Hm, what does "proper GEM object" mean in the context of udl?
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch