Hi, Christoph, On Sat, 2019-01-05 at 09:01 +0100, Christoph Hellwig wrote: > Hi Thomas, > > vmwgfx has been doing some odd checks based on DMA ops which rely > on deep DMA mapping layer internals, and I think the changes in > Linux 4.21 finally broke most of these implicit assumptions. Thanks. What we're really trying to do here is to try to detect the situation where DMA remapping using hardware IOMMUs is going on but memory is still coherent, since the driver can currently only work with coherent memory[1]. Currently we use intel_iommu_enabled to detect this situation, but it would be really helpful if there were a generic bool that advertizes this situation since we need to deal with other IOMMUs as well going forward. Any suggestion? Comments on the patches separately. Thanks, Thomas > > The real fix is in patch 3, but I think the others are important > to make it clear what is actually going on. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
