Hi Robin, On Wed, Jul 29, 2015 at 07:46:04PM +0100, Robin Murphy wrote: > Currently, users of the LPAE page table code are (ab)using dma_map_page() > as a means to flush page table updates for non-coherent IOMMUs. Since > from the CPU's point of view, creating IOMMU page tables *is* passing > DMA buffers to a device (the IOMMU's page table walker), there's little > reason not to use the DMA API correctly. > > Allow IOMMU drivers to opt into DMA API operations for page table > allocation and updates by providing their appropriate device pointer. > The expectation is that an LPAE IOMMU should have a full view of system > memory, so use streaming mappings to avoid unnecessary pressure on > ZONE_DMA, and treat any DMA translation as a warning sign. > > Signed-off-by: Robin Murphy <robin.mur...@arm.com> > --- > > Changes since v1[1]: > - Make device pointer mandatory and use DMA API unconditionally > - Remove flush_pgtable callback entirely > - Style, consistency and typo fixes
I think this is looking good now, thanks. I'll add it to my ARM SMMU queue for 4.3. Will _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
