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Fri, 25 Oct 2024 16:50:56 -0700 From: Nicolin Chen To: , , CC: , , , , , , , , , , , , , , , , , , , Subject: [PATCH v5 07/13] iommufd/viommu: Add iommufd_viommu_find_dev helper Date: Fri, 25 Oct 2024 16:50:36 -0700 Message-ID: <384f7b4333a1f75da09e390902b8f82be21a0dd3.1729897278.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: SJ1PEPF000023CF:EE_|CY8PR12MB7731:EE_ X-MS-Office365-Filtering-Correlation-Id: 006ed9b0-b188-461b-0c50-08dcf54fe412 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|36860700013|82310400026|7416014|376014; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.118.232;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(36860700013)(82310400026)(7416014)(376014);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Oct 2024 23:51:05.7064 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 006ed9b0-b188-461b-0c50-08dcf54fe412 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.232];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF000023CF.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7731 This avoids a bigger trouble of exposing struct iommufd_device and struct iommufd_vdevice in the public header. Signed-off-by: Nicolin Chen --- include/linux/iommufd.h | 8 ++++++++ drivers/iommu/iommufd/driver.c | 13 +++++++++++++ 2 files changed, 21 insertions(+) diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 0287a6d00192..dc174d02132b 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -184,6 +184,8 @@ static inline int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx) struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size, enum iommufd_object_type type); +struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu, + unsigned long vdev_id); #else /* !CONFIG_IOMMUFD_DRIVER */ static inline struct iommufd_object * _iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size, @@ -191,6 +193,12 @@ _iommufd_object_alloc(struct iommufd_ctx *ictx, size_t size, { return ERR_PTR(-EOPNOTSUPP); } + +static inline struct device * +iommufd_viommu_find_dev(struct iommufd_viommu *viommu, unsigned long vdev_id) +{ + return NULL; +} #endif /* CONFIG_IOMMUFD_DRIVER */ /* diff --git a/drivers/iommu/iommufd/driver.c b/drivers/iommu/iommufd/driver.c index c0876d3f91c7..3604443f82a1 100644 --- a/drivers/iommu/iommufd/driver.c +++ b/drivers/iommu/iommufd/driver.c @@ -36,3 +36,16 @@ struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx, return ERR_PTR(rc); } EXPORT_SYMBOL_NS_GPL(_iommufd_object_alloc, IOMMUFD); + +/* Caller should xa_lock(&viommu->vdevs) to protect the return value */ +struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu, + unsigned long vdev_id) +{ + struct iommufd_vdevice *vdev; + + lockdep_is_held(&viommu->vdevs.xa_lock); + + vdev = xa_load(&viommu->vdevs, vdev_id); + return vdev ? vdev->idev->dev : NULL; +} +EXPORT_SYMBOL_NS_GPL(iommufd_viommu_find_dev, IOMMUFD);