On Tue, Aug 19, 2025 at 08:36:55PM +0300, Leon Romanovsky wrote: > From: Leon Romanovsky <leo...@nvidia.com> > > Introduce new DMA mapping functions dma_map_phys() and dma_unmap_phys() > that operate directly on physical addresses instead of page+offset > parameters. This provides a more efficient interface for drivers that > already have physical addresses available. > > The new functions are implemented as the primary mapping layer, with > the existing dma_map_page_attrs()/dma_map_resource() and > dma_unmap_page_attrs()/dma_unmap_resource() functions converted to simple > wrappers around the phys-based implementations. > > In case dma_map_page_attrs(), the struct page is converted to physical > address with help of page_to_phys() function and dma_map_resource() > provides physical address as is together with addition of DMA_ATTR_MMIO > attribute. > > The old page-based API is preserved in mapping.c to ensure that existing > code won't be affected by changing EXPORT_SYMBOL to EXPORT_SYMBOL_GPL > variant for dma_*map_phys().
Looks good. Reviewed-by: Keith Busch <kbu...@kernel.org>
