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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 06/16] iommu/dma: extend iommu_dma_*map_phys API to handle MMIO memory Message-ID: <20250828134927.GE9469@nvidia.com> References: <4f84639baf6d5d0e107fd2001dff91b6538ff9ae.1755624249.git.leon@kernel.org> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4f84639baf6d5d0e107fd2001dff91b6538ff9ae.1755624249.git.leon@kernel.org> X-ClientProxiedBy: YT4PR01CA0489.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:10c::8) To CH3PR12MB8659.namprd12.prod.outlook.com (2603:10b6:610:17c::13) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PR12MB8659:EE_|LV8PR12MB9336:EE_ X-MS-Office365-Filtering-Correlation-Id: 10e3762c-9d9f-41d7-cb18-08dde639b556 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Aug 19, 2025 at 08:36:50PM +0300, Leon Romanovsky wrote: > From: Leon Romanovsky > > Combine iommu_dma_*map_phys with iommu_dma_*map_resource interfaces in > order to allow single phys_addr_t flow. > > In the following patches, the iommu_dma_map_resource() will be removed > in favour of iommu_dma_map_phys(..., attrs | DMA_ATTR_MMIO) flow. I would reword this a little bit iommu/dma: implement DMA_ATTR_MMIO for iommu_dma_(un)map_phys() Make iommu_dma_map_phys() and iommu_dma_unmap_phys() respect DMA_ATTR_MMIO. DMA_ATTR_MMIO makes the functions behave the same as iommu_dma_(un)map_resource(): - No swiotlb is possible - No cache flushing is done (ATTR_MMIO should not be cached memory) - prot for iommu_map() has IOMMU_MMIO not IOMMU_CACHE This is preperation for replacing iommu_dma_map_resource() callers with iommu_dma_map_phys(DMA_ATTR_MMIO) and removing iommu_dma_(un)map_resource(). Reviewed-by: Jason Gunthorpe Jason