On Tue, May 7, 2013 at 1:59 AM, Daniel Vetter daniel@ffwll.ch wrote:
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@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?
One that appears the same as a GEM object created by userspace. i.e. mmap works.
Dave.