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Wed, 30 Oct 2024 14:35:47 -0700 From: Nicolin Chen To: , , CC: , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v6 06/10] iommufd/viommu: Add iommufd_viommu_find_dev helper Date: Wed, 30 Oct 2024 14:35:32 -0700 Message-ID: <3f0240cf9f2169750d929ecbc8cc658ed5bc3734.1730313494.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: CO1PEPF000066ED:EE_|PH8PR12MB8607:EE_ X-MS-Office365-Filtering-Correlation-Id: 6d3de943-6d18-4520-d9fa-08dcf92ae06f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|82310400026|1800799024|36860700013|376014|7416014; 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)(82310400026)(1800799024)(36860700013)(376014)(7416014); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 30 Oct 2024 21:36:12.8199 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6d3de943-6d18-4520-d9fa-08dcf92ae06f 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: CO1PEPF000066ED.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH8PR12MB8607 This avoids a bigger trouble of exposing struct iommufd_device and struct iommufd_vdevice in the public header. Reviewed-by: Kevin Tian 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 4e59af87a524..d263bd9fca6b 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -142,6 +142,8 @@ 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 */ static inline struct iommufd_ctx *iommufd_ctx_from_file(struct file *file) { @@ -189,6 +191,12 @@ _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 */ /* diff --git a/drivers/iommu/iommufd/driver.c b/drivers/iommu/iommufd/driver.c index 2bc47d92a0ab..7b67fdf44134 100644 --- a/drivers/iommu/iommufd/driver.c +++ b/drivers/iommu/iommufd/driver.c @@ -36,5 +36,18 @@ struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx, } 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_assert_held(&viommu->vdevs.xa_lock); + + vdev = xa_load(&viommu->vdevs, vdev_id); + return vdev ? vdev->dev : NULL; +} +EXPORT_SYMBOL_NS_GPL(iommufd_viommu_find_dev, IOMMUFD); + MODULE_DESCRIPTION("iommufd code shared with builtin modules"); MODULE_LICENSE("GPL");