On Wed, Oct 7, 2020 at 8:21 AM Christoph Hellwig <hch@xxxxxx> wrote: > > On Tue, Oct 06, 2020 at 10:56:04PM +0200, Tomasz Figa wrote: > > > Yes. And make sure the API isn't implemented when VIVT caches are > > > used, but that isn't really different from the current interface. > > > > Okay, thanks. Let's see if we can make necessary changes to the videobuf2. > > > > +Sergey Senozhatsky for awareness too. > > I can defer the changes a bit to see if you'd really much prefer > the former interface. I think for now the most important thing is > that it works properly for the potential users, and the prime one is > videobuf2 for now. drm also seems like a big potential users, but I > had a really hard time getting the developers to engage in API > development. My initial feeling is that it should work, but we'll give you a definitive answer once we prototype it. :) We might actually give it a try in the USB HCD subsystem as well, to implement usb_alloc_noncoherent(), as an optimization for drivers which have to perform multiple random accesses to the URB buffers. I think you might recall discussing this by the way of the pwc and uvcvideo camera drivers. Best regards, Tomasz
