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Thu, 17 Oct 2024 11:48:25 -0700 Date: Thu, 17 Oct 2024 11:48:24 -0700 From: Nicolin Chen To: Jason Gunthorpe CC: , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v3 11/11] iommu/arm-smmu-v3: Add IOMMU_VIOMMU_TYPE_ARM_SMMUV3 support Message-ID: References: <562f2bfae1661e6ff6abdb280faa0dd49df9fbdc.1728491453.git.nicolinc@nvidia.com> <20241017184015.GP3559746@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20241017184015.GP3559746@nvidia.com> X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF0002636C:EE_|SN7PR12MB7449:EE_ X-MS-Office365-Filtering-Correlation-Id: fbf0ceac-a503-425c-1abe-08dceedc4b68 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|376014|7416014|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?idzURIIiLrjSNXF7YXh9oYT6jX7An6jytHLCsMvulPHTHsUxngWVSOKv3Yv7?= =?us-ascii?Q?K3FiTOh0Ia9crVXlVdCuDg9iVwq0ibIxJTHopJYowXO/E09G2+1rVl4XJrBh?= =?us-ascii?Q?3ybzwIE8JK1msg/RlVWBi27r2Q2Vf6Egcl8ngWFoiZzVxlJpb3vlDUwIlWr1?= =?us-ascii?Q?qiCqsqGO8Vz/gBNIZZ3EivF5vr/Pz8fZkbjNDNywlJgkOpFpwQZX6VqVmKLC?= =?us-ascii?Q?AfE25fd6RlRQL4jtt/FkgNewwNrXif+XdM60BOQnkRRd8NNge0eRS4CX3MeL?= =?us-ascii?Q?hD2Cs7Z/gGhKJxR8fPI9nDzzGBj1hEdb2ELNdbU6+Ww2QGNxDbCQImDwvwaH?= =?us-ascii?Q?olYxhL96RVzNbMKsJnCUZC95eRJjJ+RHUPGHp1HGnMspvrJQQsT9KpuDBl4V?= =?us-ascii?Q?4568EB/J+1IvixaxAau0jNc46q8wtImyVjDNIr4xMrBTpMoR0s4NxvICbMuU?= =?us-ascii?Q?JZI97mukGZdVFC5qIi2gyuXEKv/VsgmP0ZLg8bn/oMr9sDW30dpJLKrFiQSs?= =?us-ascii?Q?+mRlFRITQxtYtHqi31DnNhf6ovgRSgw5lg2v+p/DeIVFdh85vLDLVUq2xaNP?= =?us-ascii?Q?uD60qPbaVLzwFiFtoRPB7WMRsccOWnvKduGk59cfjtEpffGVyda5WJDlF5dn?= =?us-ascii?Q?iRDAyYALwyVDB1fiojLGWJVWoPI1Lj/bPbn1ire+GwoDGQCBuLgnFeeB8eCd?= =?us-ascii?Q?FWlXKiX2jznlVUWNp85lwTfsLBjFWV/xot9VfEW8dbNYs+UHMtyjBHANz5Ky?= =?us-ascii?Q?o2zrNO3ygABY9jYW4VCiDRalajJ0BwHq0iy/l+mTuwqJkUV9Wx3awJgAnuk3?= =?us-ascii?Q?K064UXlBaiRYOnBXoD3nlB1MduoD5QtwQ96xDidfo8Rptx/kufFqWjfiPYqN?= =?us-ascii?Q?pt6YLUA8LsYRBtryDkD84wZPj0Pw3oQ2nuC4kUnTEWu0ttLJADtudqtNSfpB?= =?us-ascii?Q?0jq7DE3DFT18FoKmAAvsBBqT449iKJ8PrWG1RrXLd21BUvPm5YY5KLTRsTnQ?= =?us-ascii?Q?RBs4TTm0cR8WmKqQCEAB1Duo5cNa6U8WKZr5pFvEv3/kEVVcowdCcDrETEH5?= =?us-ascii?Q?zeAX1h8+i0wJN+GlS1ss+h7bWPLXf4mVwE6y/UJuaKD98MWFYbX2YhPpbp0u?= =?us-ascii?Q?g6/m+9IYHhodEKAj8LCqSOf0wiJ2N5h3ngl6DK8FOVWW84UPIF1GF0QXQ7xg?= =?us-ascii?Q?Q0fPf5v6UE9wtTiqc6h5t7fyP60Txt8ZXCTSH3y98VmcATH7h6Z0nUOE30lF?= =?us-ascii?Q?+UyWsECaIz0DshKBrLRBp58xOvF8+Or3ir9YU/+B0EOIOkGQmqUdrAOWFlOO?= =?us-ascii?Q?nd0OomPOwB6rDJJWr/0qveQbChpg4XuAHOUBMIXfKmnT5FitVDhvbRbl6ASe?= =?us-ascii?Q?UNP70x3OERrYcqMsaGA/XzybcQUVnceAFuUgATu+i+k/B7KCIA=3D=3D?= X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230040)(82310400026)(36860700013)(376014)(7416014)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Oct 2024 18:48:30.3847 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fbf0ceac-a503-425c-1abe-08dceedc4b68 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SN1PEPF0002636C.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB7449 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241017_114836_377793_0E811FA1 X-CRM114-Status: GOOD ( 16.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, Oct 17, 2024 at 03:40:15PM -0300, Jason Gunthorpe wrote: > On Wed, Oct 09, 2024 at 09:38:11AM -0700, Nicolin Chen wrote: > > Add a new driver-type for ARM SMMUv3 to enum iommu_viommu_type. Implement > > +static inline struct iommufd_viommu * > > +arm_vsmmu_alloc(struct iommu_device *iommu_dev, struct iommu_domain *parent, > > + struct iommufd_ctx *ictx, unsigned int viommu_type) > > +{ > > + return ERR_PTR(-EOPNOTSUPP); > > +} > > Let's do #define NULL here instead so we don't get an op at all. Ack. > > +struct iommufd_viommu * > > +arm_vsmmu_alloc(struct iommu_device *iommu_dev, struct iommu_domain *parent, > > + struct iommufd_ctx *ictx, unsigned int viommu_type) > > +{ > > + struct arm_smmu_device *smmu = > > + container_of(iommu_dev, struct arm_smmu_device, iommu); > > + struct arm_smmu_domain *s2_parent = to_smmu_domain(parent); > > + struct arm_vsmmu *vsmmu; > > + > > + if (viommu_type != IOMMU_VIOMMU_TYPE_ARM_SMMUV3) > > + return ERR_PTR(-EOPNOTSUPP); > > So what happens if the user tries to create a default domain? > > It skips this and just creates an normal viommu object > > But then what? The driver needs to make sure it never casts that to a > arm_vsmmu ? How? So long as a driver doesn't provide iommu_ops->default_viommu_ops, it should be fine. We may also block DEFAULT viommu allocations in the core if the driver doesn't provide that default_viommu_ops. Nicolin