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Tsirkin" , Miguel Ojeda , Robin Murphy , rust-for-linux@vger.kernel.org, Sagi Grimberg , Stefano Stabellini , Steven Rostedt , virtualization@lists.linux.dev, Will Deacon , xen-devel@lists.xenproject.org Subject: Re: [PATCH v4 11/16] dma-mapping: export new dma_*map_phys() interface Message-ID: References: X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Aug 19, 2025 at 08:36:55PM +0300, Leon Romanovsky wrote: > From: Leon Romanovsky > > 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