On Mon, Feb 15, 2021 at 12:58 AM Christian König <christian.koenig@xxxxxxx> wrote: > > Hi guys, > > we are currently working an Freesync and direct scan out from system > memory on AMD APUs in A+A laptops. > > On problem we stumbled over is that our display hardware needs to scan > out from uncached system memory and we currently don't have a way to > communicate that through DMA-buf. > > For our specific use case at hand we are going to implement something > driver specific, but the question is should we have something more > generic for this? I'm a bit late to this party (and sorry, I didn't read the entire thread), but it occurs to me that dmabuf mmap_info[1] would also get you what you need, ie. display importing dma-buf could check whether the exporter is mapping cached or not, and reject the import if needed? [1] https://patchwork.freedesktop.org/patch/496069/?series=106847&rev=2 > After all the system memory access pattern is a PCIe extension and as > such something generic. > > Regards, > Christian. > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/dri-devel
