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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 00/16] dma-mapping: migrate to physical address-based API Message-ID: <20250829131625.GK9469@nvidia.com> References: Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-ClientProxiedBy: SA1P222CA0056.NAMP222.PROD.OUTLOOK.COM (2603:10b6:806:2c1::8) To MW6PR12MB8663.namprd12.prod.outlook.com (2603:10b6:303:240::9) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MW6PR12MB8663:EE_|CY5PR12MB6430:EE_ X-MS-Office365-Filtering-Correlation-Id: ba19d7ec-1bfe-485d-d6d3-08dde6fe431b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|366016|7416014|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?j9VFqPDzvWCSugcsFZk8FRKZSbP5XUc8PO8hHBRkFrxG3PV5kB5sPfbUJe92?= =?us-ascii?Q?qM0CxUgtXXI7t6zdv+qXHeS/lN53bNx212jQJ9v3L+Hc23xLOb6UUptvjU7z?= =?us-ascii?Q?0nsgu+opQ/YYez+5mzeYkADogU4B0i8D47uiMeLy3LzYnrQIHKgNCHcZO1yS?= =?us-ascii?Q?LG+8lbyIJozKkFtjoIotPpC8K7NYZDG3KtJT/WWPuHQAmo46MyGR4IofXut3?= =?us-ascii?Q?je1OWIV0WSsYK4ukVbnQg9ZYQKr1OHm1DjwIwiNTrnp0NQuUIZCsF156iBEm?= =?us-ascii?Q?B8zNikV+SA+/4Qfwqp1NmUkOyiagQH1plfZRm+LUo92lJgB0Qmsd6LcX62LM?= =?us-ascii?Q?gFbiQevxrEKfmYj1RUUU/xOL69n3rNSrLKiIMqnNrjV5yPGaNa0tzyi1F94a?= =?us-ascii?Q?GhaoOM2I7fQIqxQndqWWMESGG9xiRwa+Mv7ozbT7r5zo4wd2ti8QljFc6LFK?= =?us-ascii?Q?+wn3vHsEe708TW+TVt8bXIzew8QVhx/fZXNI9i92CwccGJWNDdsx0NC+PZlU?= =?us-ascii?Q?C7506ogxRZvWMiEuEXkVNtzx1EYNVX96/n0U5mktuMVXhwoipSXKnH1qojab?= =?us-ascii?Q?9J+silk9IMFoa7A2k/W4/Iu6i3P/NWeoYoz+XNtLBXHhL1S0XYt6tO/4UOme?= =?us-ascii?Q?vomWDP8TRhDyKciwsbOZP62Raiqxx50YaH4V0R8YQlVytdSGZ6IWiLNLDq5C?= =?us-ascii?Q?ptw+3qyhWSPC8kqhCRYqnIpFWRA4W9rsv93pjkTAGdMdDINsZgliTFijLYPv?= =?us-ascii?Q?8cO+ic2nAYNeAqOUPe4ghcpxyfBDkc00HL0cBBk8DGw7IeHTTfUaoBi2/2KR?= =?us-ascii?Q?La1M+ngOqXBhts99xfBpbxRqrscFL+7GndFI1b4IhwodO4ZeJCWWJpgzLchS?= =?us-ascii?Q?t2gNzDyQyP/cUQKoiEA8/KXW613z9c0e2fdluhgpvOFziWzkd+DF9VHwC036?= =?us-ascii?Q?6QsIpabpQEIBVuiY92nH4XHlDFfHHtnflDSIhb+QGgYzGrFrfjm+eD4qIlGe?= =?us-ascii?Q?m81qxYrhAb8gguLUv/gIorbJbOcg5qFMCQ+XYOqnf6h8JIy2Yt6IiULdW4FJ?= =?us-ascii?Q?fUIra0gq8JbHZh8RLxzKzBKYbsAopMLfMzMIrtW9vzvoaGSaeEEHPlnZGemP?= =?us-ascii?Q?BY7rtxngUTeL+OLq6/F1QQ1vhjSpdEGRDcuzi5cvww3rf31DNcAIW/bBi/RS?= =?us-ascii?Q?oa0KPVhb5LjKn7l+XAT6kwi1xZXdX+e1YiaCFNymCyhy7vWtGJLN6SmQvgjh?= =?us-ascii?Q?AnFWFiC7U0Td8YqtXX8z0/U4aw5aqUJKg4CW4H4Vsxj9dKoA86MQ0BYy6gcN?= =?us-ascii?Q?/zaqzKi5XiCdWrHgiug0Ss0YQ/LjuLyIZRVRTNPlsL4woMRNUGzxojLdJzi5?= =?us-ascii?Q?j8gdLTa8o2fZ6t83iMuZyGW3j57C6es60RHXRnyS9nDqS+Gufqi6TATubaAG?= =?us-ascii?Q?9Pk99+LH3rc=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:MW6PR12MB8663.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(376014)(366016)(7416014)(1800799024);DIR:OUT;SFP:1101; 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A followup series > will give the same treatment to the legacy dma_ops implementation. I took a quick check over this to see that it is sane. I think using phys is an improvement for most of the dma_ops implemenations. arch/sparc/kernel/pci_sun4v.c arch/sparc/kernel/iommu.c Uses __pa to get phys from the page, never touches page arch/alpha/kernel/pci_iommu.c arch/sparc/mm/io-unit.c drivers/parisc/ccio-dma.c drivers/parisc/sba_iommu.c Does page_addres() and later does __pa on it. Doesn't touch struct page arch/x86/kernel/amd_gart_64.c drivers/xen/swiotlb-xen.c arch/mips/jazz/jazzdma.c Immediately does page_to_phys(), never touches struct page drivers/vdpa/vdpa_user/vduse_dev.c Does page_to_phys() to call iommu_map() drivers/xen/grant-dma-ops.c Does page_to_pfn() and nothing else arch/powerpc/platforms/ps3/system-bus.c This is a maze but I think it wants only phys and the virt is only used for debug prints. The above all never touch a KVA and just want a phys_addr_t. The below are touching the KVA somehow: arch/sparc/mm/iommu.c arch/arm/mm/dma-mapping.c Uses page_address to cache flush, would be happy with phys_to_virt() and a PhysHighMem() arch/powerpc/kernel/dma-iommu.c arch/powerpc/platforms/pseries/vio.c Uses iommu_map_page() which wants phys_to_virt(), doesn't touch struct page arch/powerpc/platforms/pseries/ibmebus.c Returns phys_to_virt() as dma_addr_t. The two PPC ones are weird, I didn't figure out how that was working.. It would be easy to make map_phys patches for about half of these, in the first grouping. Doing so would also grant those arches map_resource capability. Overall I didn't think there was any reduction in maintainability in these places. Most are improvements eliminating code, and some are just switching to phys_to_virt() from page_address(), which we could further guard with DMA_ATTR_MMIO and a check for highmem. Jason