On Mon, May 06, 2019 at 03:09:20PM +0200, Thomas Zimmermann wrote: > Hi > > Am 06.05.19 um 14:22 schrieb Gerd Hoffmann: > >> GEM VRAM could implement PRIME helpers, which would allow for using > >> the generic fbcon. > > > > bochs_gem_prime_*() functions with this series applied look like you can > > just rename them & move over to vram helpers. > > > > It's not a full prime implementation, specifically actual export/import > > isn't there. But pin+vmap (needed by generic fbcon) is implemented. > > I did have a patch to do this, but then I read that prime requires DMA > for buffer sharing and bochs works only because it's emulated. For actual buffer sharing with other drivers yes because dma-bufs typically are a bunch of pages (struct page**) and live in RAM. Not sure whenever it is possible or useful to place the vram in ZONE_DEVICE to get page structs for it, then export buffers located in vram that way without copying them over to main memory. I suspect most importers would fail to properly setup PCI-PCI dma in that case. > If bochs' implementation is complete enough to be useful for other > drivers, I'll add it to the patch set. It's good enough for generic fbcon. cheers, Gerd _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
