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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?2QsxhHaBdKBPTwR9sESsZJC8nVn452LUjnKgAMWr3RLE8dg1rAo3IJaJvvXP?= =?us-ascii?Q?DevS4VoJyApieGSq189l6Nio0jf6TqQQ3mF8byiLREQxDiULvAphb9kIzA3F?= =?us-ascii?Q?EMwos0xutpKq+8YP+a7Iyd59+qtT+4HrlCXNIOR1CuA2unHAQD1i//DVhkAE?= =?us-ascii?Q?UrSoXzW1cN39e1+yxuqc4Gs/NqPWJkxN7yxnwMDQZEruxbfRpK5wNDfz9kFW?= =?us-ascii?Q?9nkWsbEfQJ+znJ2ijE/iB0f9ozmSiNa9EYhyS9C1Eye6pNVzeAs8NYrXeu8D?= =?us-ascii?Q?EYFXuMFF7CxAxVTUnltjp/KHVMJGNabsskfENwSFNtl0quxXjldrb+i19kcx?= =?us-ascii?Q?WMLOdcWCe5k0C7Ih4BvdW3V7Eii7pTghRvTtksICCLNHYy6dyMkR88kk+gma?= =?us-ascii?Q?8DDsTKOQ7PYgp0pYE8vMwUyPnBGL7mtp9OLL8XYneZKguozgPu7WB0VnP44h?= =?us-ascii?Q?zhYQtFqpciWRGZvVlCBALCX5Zt1naLemKbdIQ/injCBx8W3muIFGLP5nzxy6?= =?us-ascii?Q?3gytYzAs7TEBcJhhDLJOnorwpgtonpGSS1GFRl17WJP7rmPfMUbdW6+/NIIH?= =?us-ascii?Q?YQ1PwM0KpSnwJ69TugCTKdGGaMkuO5qNSp/Ace+/cuPu0ygLgQNbJbVDtU+y?= =?us-ascii?Q?RfANHl5ZkFyIqnqCZ0jHU70ktyAhoKSlxHzka2x15VxfSwdhh6Mq5HN6psA2?= =?us-ascii?Q?hedVeDfPCJcjJH9cY/jNFCXFgOi34DHTRvIzQH8HeTqJR4i5kXV1xeEaPe2d?= =?us-ascii?Q?J6z+8VW4KivsOijTmNFsq5il2sfExLFO0acfgjEbEkChQQKYS5IKi6MCkqob?= =?us-ascii?Q?iI8IkeULImKxqoUqoxQTnNC+EWTfV3U+YmKCkaN0v3/rRyqTkPDCv8MMubi3?= =?us-ascii?Q?tHBs3/NqHLTQqV7sDJGMvbeupgZrlQ0JVh8EzK2R/IEbdEqKGN4e6Xcoovnu?= =?us-ascii?Q?unQ/fTmoI5omXp0vIB9j01/vCECl/M+lVTbdELccShMjp3TcV/kh1qtT52I+?= =?us-ascii?Q?3HJodujSLQsbkUn6dHuV+KexgSFrNfginaeSqDffwWK350zLyW3QWyGhpX9f?= =?us-ascii?Q?jOPIRNMYunCEA6hs3WcN6QvGg5fdJLE/eUG4sPDFELD8N5HIS2uddqmanNpP?= =?us-ascii?Q?raZK2xegS6Ed4CinrN3ZfV4sY3Ne5OsaT1q43bvPMWcRpJjStJWo4txmwVdo?= =?us-ascii?Q?+GCoMf4mv7nMrET9ugRENfKdGFl0X+WWqnhS9yHFlND6a0hdqsUcKtIcqVzP?= =?us-ascii?Q?Z2DkG+8JggUZo79Nbuwnw/yv5LlFXmRcxVfxYfLyI8aTLdcfoj/ZByq3yu+u?= =?us-ascii?Q?lGpQ7WrhBZO2UIL+VWdjqAgZ6JVaguQ+KR0OTrGNKaWwqxUh/WWr4RDLyaVj?= =?us-ascii?Q?eCQqJcIIJgAbeDtheQ19FWRO2T5dLCVhtwQxRn3H4kGbgOtLDsRMqrtIhx5c?= =?us-ascii?Q?tgLNJHRZ927xyosSMk+r5wnaVUkfA3DOAeVLpXMbukEoqZ3KNvOgzYXLaUSF?= =?us-ascii?Q?ihJoRBMBg0bYiytA0o2yXP2vlUxK0TNs0Q9NUUFhk8nyUOECYlzANI80FYDB?= =?us-ascii?Q?rKUl6/7Ws5mUWO8MnVhfMEnh24OiR1lKONGnSoZgzbZIpx2UYA35Podliipp?= =?us-ascii?Q?mNqqFK8Lgg9DlAGSnN2+LKlorR+vPEvA6z5Mh/0Vd+U3v+rxlCvSwneHOzHI?= =?us-ascii?Q?9rgXLzWJFmBXGGoFNpe99ONdIbHrZ+JlOUyHqoXuXDu+DhfQw6sRymPSb4cg?= =?us-ascii?Q?daOlVGaipA=3D=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: c06cc69f-9952-46d2-d87a-08da3d8ab6cd X-MS-Exchange-CrossTenant-AuthSource: MN2PR12MB4192.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 May 2022 13:38:40.9164 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: phH/bdk3jj6gQ1J2aPf64kkhBe7t1SP+EGhuPWW57dNzAQ5KGvlKq6Hu64TXGUh0 X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR12MB2438 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 24, 2022 at 09:39:52AM +0000, Tian, Kevin wrote: > > From: Lu Baolu > > Sent: Thursday, May 19, 2022 3:21 PM > > > > The iommu_sva_domain represents a hardware pagetable that the IOMMU > > hardware could use for SVA translation. This adds some infrastructure > > to support SVA domain in the iommu common layer. It includes: > > > > - Add a new struct iommu_sva_domain and new IOMMU_DOMAIN_SVA > > domain > > type. > > - Add a new domain ops pointer in iommu_ops. The IOMMU drivers that > > support SVA should provide the callbacks. > > - Add helpers to allocate and free an SVA domain. > > - Add helpers to set an SVA domain to a device and the reverse > > operation. > > > > Some buses, like PCI, route packets without considering the PASID value. > > Thus a DMA target address with PASID might be treated as P2P if the > > address falls into the MMIO BAR of other devices in the group. To make > > things simple, the attach/detach interfaces only apply to devices > > belonging to the singleton groups, and the singleton is immutable in > > fabric i.e. not affected by hotplug. > > > > The iommu_set/block_device_pasid() can be used for other purposes, > > such as kernel DMA with pasid, mediation device, etc. Hence, it is put > > in the iommu.c. > > usually we have 'set/clear' pair or 'allow/block'. Having 'set' paired > with 'block' doesn't read very clearly. I thought we agreed we'd use the blocking domain for this? Why did it go back to an op? 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Tue, May 24, 2022 at 09:39:52AM +0000, Tian, Kevin wrote: > > From: Lu Baolu > > Sent: Thursday, May 19, 2022 3:21 PM > > > > The iommu_sva_domain represents a hardware pagetable that the IOMMU > > hardware could use for SVA translation. This adds some infrastructure > > to support SVA domain in the iommu common layer. It includes: > > > > - Add a new struct iommu_sva_domain and new IOMMU_DOMAIN_SVA > > domain > > type. > > - Add a new domain ops pointer in iommu_ops. The IOMMU drivers that > > support SVA should provide the callbacks. > > - Add helpers to allocate and free an SVA domain. > > - Add helpers to set an SVA domain to a device and the reverse > > operation. > > > > Some buses, like PCI, route packets without considering the PASID value. > > Thus a DMA target address with PASID might be treated as P2P if the > > address falls into the MMIO BAR of other devices in the group. To make > > things simple, the attach/detach interfaces only apply to devices > > belonging to the singleton groups, and the singleton is immutable in > > fabric i.e. not affected by hotplug. > > > > The iommu_set/block_device_pasid() can be used for other purposes, > > such as kernel DMA with pasid, mediation device, etc. Hence, it is put > > in the iommu.c. > > usually we have 'set/clear' pair or 'allow/block'. Having 'set' paired > with 'block' doesn't read very clearly. I thought we agreed we'd use the blocking domain for this? Why did it go back to an op? Jason _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu