On 25.06.2025 15:18, Leon Romanovsky wrote: > This series refactors the DMA mapping to use physical addresses > as the primary interface instead of page+offset parameters. This > change aligns the DMA API with the underlying hardware reality where > DMA operations work with physical addresses, not page structures. > > The series consists of 8 patches that progressively convert the DMA > mapping infrastructure from page-based to physical address-based APIs: > > The series maintains backward compatibility by keeping the old > page-based API as wrapper functions around the new physical > address-based implementations.
Thanks for this rework! I assume that the next step is to add map_phys callback also to the dma_map_ops and teach various dma-mapping providers to use it to avoid more phys-to-page-to-phys conversions. I only wonder if this newly introduced dma_map_phys()/dma_unmap_phys() API is also suitable for the recently discussed PCI P2P DMA? While adding a new API maybe we should take this into account? My main concern is the lack of the source phys addr passed to the dma_unmap_phys() function and I'm aware that this might complicate a bit code conversion from old dma_map/unmap_page() API. Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland
