On Tue, May 7, 2013 at 1:59 AM, Daniel Vetter <daniel@xxxxxxxx> 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@xxxxxxxxxx> >> > >> > 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. -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
