On Thu, Jan 31, 2019 at 02:35:14PM -0500, Jerome Glisse wrote: > > Basically invert the API flow - the DMA map would be done close to > > GUP, not buried in the driver. This absolutely doesn't work for every > > flow we have, but it does enable the ones that people seem to care > > about when talking about P2P. > > This does not work for GPU really i do not want to have to rewrite GPU > driver for this. Struct page is a burden and it does not bring anything > to the table. I rather provide an all in one stop for driver to use > this without having to worry between regular vma and special vma. I'm talking about almost exactly what you've done in here - make a 'sgl' that is dma addresses only. In these VMA patches you used a simple array of physical addreses - I'm only talking about moving that array into a 'dma sgl'. The flow is still basically the same - the driver directly gets DMA physical addresses with no possibility to get a struct page or CPU memory. And then we can build more stuff around the 'dma sgl', including the in-kernel users Logan is worrying about. Jason _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
