On Tue, Jul 09, 2013 at 11:10:13AM +0200, Daniel Vetter wrote: > One ugly part is that conceptually I think we want to support dma_buf > exporting of stolen memory objects. After all exporting scanout buffers > for rendering by the dgpu is the prime use-case of dma_buf. No. prime only exports an intermediate buffer, I don't see how you would maintain coherency between the display engine and a foriegn GPU, given the limited API. However fd passing remains a real issue. Do we not in that case simply resolve the fd into a new handle onto the old bo and discard the dma-buf? Phew we do, so that still works. The only case we have to worry about is exporting stolen over dma-buf to a discrete GPU, which will actually be rare and we could just forbid exporting the stolen bo? Better to fix it up from the start though. -Chris -- Chris Wilson, Intel Open Source Technology Centre
