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Tue, 27 Aug 2024 10:02:27 -0700 From: Nicolin Chen To: , , CC: , , , , , , , , , , , , , , , , Subject: [PATCH v1 05/10] iommufd/viommu: Add iommufd_vdev_id_to_dev helper Date: Tue, 27 Aug 2024 10:02:07 -0700 Message-ID: <0079015047db9981c111f09414a863b644c038ef.1724777091.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS3PEPF000099D6:EE_|IA1PR12MB6387:EE_ X-MS-Office365-Filtering-Correlation-Id: 6c1c7aa8-3382-4c97-35b9-08dcc6ba1335 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|376014|7416014|82310400026; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(36860700013)(376014)(7416014)(82310400026);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Aug 2024 17:02:46.6519 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6c1c7aa8-3382-4c97-35b9-08dcc6ba1335 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DS3PEPF000099D6.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6387 This helps drivers to get the dev pointer held by the vdev_id structure. Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/viommu_api.c | 14 ++++++++++++++ include/linux/iommufd.h | 7 +++++++ 2 files changed, 21 insertions(+) diff --git a/drivers/iommu/iommufd/viommu_api.c b/drivers/iommu/iommufd/viommu_api.c index 3772a5892a6c..82eb33e047cf 100644 --- a/drivers/iommu/iommufd/viommu_api.c +++ b/drivers/iommu/iommufd/viommu_api.c @@ -51,3 +51,17 @@ iommufd_viommu_to_parent_domain(struct iommufd_viommu *viommu) return viommu->hwpt->common.domain; } EXPORT_SYMBOL_NS_GPL(iommufd_viommu_to_parent_domain, IOMMUFD); + +/* + * Fetch the dev pointer in the vdev_id structure. Caller must make ensure the + * lifecycle of the vdev_id structure, likely by adding a driver-level lock to + * protect the passed-in vdev_id for any race against a potential unset_vdev_id + * callback. + */ +struct device *iommufd_vdev_id_to_dev(struct iommufd_vdev_id *vdev_id) +{ + if (!vdev_id || !vdev_id->viommu) + return NULL; + return vdev_id->idev->dev; +} +EXPORT_SYMBOL_NS_GPL(iommufd_vdev_id_to_dev, IOMMUFD); diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index c89583c7c792..88d6586a424f 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -99,6 +99,7 @@ void iommufd_access_unpin_pages(struct iommufd_access *access, unsigned long iova, unsigned long length); int iommufd_access_rw(struct iommufd_access *access, unsigned long iova, void *data, size_t len, unsigned int flags); +struct device *iommufd_vdev_id_to_dev(struct iommufd_vdev_id *vdev_id); int iommufd_vfio_compat_ioas_get_id(struct iommufd_ctx *ictx, u32 *out_ioas_id); int iommufd_vfio_compat_ioas_create(struct iommufd_ctx *ictx); int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx); @@ -138,6 +139,12 @@ static inline int iommufd_access_rw(struct iommufd_access *access, unsigned long return -EOPNOTSUPP; } +static inline struct device * +iommufd_vdev_id_to_dev(struct iommufd_vdev_id *vdev_id) +{ + return NULL; +} + static inline int iommufd_vfio_compat_ioas_create(struct iommufd_ctx *ictx) { return -EOPNOTSUPP;