Quoting Chris Wilson (2021-01-20 18:06:08) > Quoting Matthew Auld (2021-01-20 17:46:10) > > On Wed, 20 Jan 2021 at 15:40, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> wrote: > > > > > > If we import a shmemfs object between devices, for example from > > > Tigerlake to DG1, we can simply reuse the native object and its backing > > > store. > > > > Hmmm interesting, so does that include re-using the actual sg mapping > > for the backing pages? Does that work out-of-the-box between different > > devices assuming we have iommu enabled? > > Indeed interesting; the dma_addr_t are supposed to be local to a device. On reflection, we are expected to use cross-device dma_addr_t with dma-buf. It's the exporter who assigns the dma_addr_t for the importer to use, and they are always given from the original device. Maybe not so bad. Definitely needs testing to see what happens in practice. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
