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Sat, 17 May 2025 20:22:00 -0700 From: Nicolin Chen To: , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v5 04/29] iommu: Add iommu_copy_struct_to_user helper Date: Sat, 17 May 2025 20:21:21 -0700 Message-ID: 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: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF00017090:EE_|CY8PR12MB7337:EE_ X-MS-Office365-Filtering-Correlation-Id: 04f16a45-cca6-41db-b526-08dd95bb2d3c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|82310400026|376014|36860700013|1800799024|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)(376014)(36860700013)(1800799024)(7416014); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 May 2025 03:22:10.5268 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 04f16a45-cca6-41db-b526-08dd95bb2d3c 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: DS1PEPF00017090.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7337 Similar to the iommu_copy_struct_from_user helper receiving data from the user space, add an iommu_copy_struct_to_user helper to report output data back to the user space data pointer. Reviewed-by: Jason Gunthorpe Reviewed-by: Lu Baolu Reviewed-by: Pranjal Shrivastava Reviewed-by: Kevin Tian Signed-off-by: Nicolin Chen --- include/linux/iommu.h | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 0db39f922775..5f9c4eaaaaff 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -562,6 +562,46 @@ iommu_copy_struct_from_full_user_array(void *kdst, size_t kdst_entry_size, return 0; } +/** + * __iommu_copy_struct_to_user - Report iommu driver specific user space data + * @dst_data: Pointer to a struct iommu_user_data for user space data location + * @src_data: Pointer to an iommu driver specific user data that is defined in + * include/uapi/linux/iommufd.h + * @data_type: The data type of the @src_data. Must match with @dst_data.type + * @data_len: Length of current user data structure, i.e. sizeof(struct _src) + * @min_len: Initial length of user data structure for backward compatibility. + * This should be offsetofend using the last member in the user data + * struct that was initially added to include/uapi/linux/iommufd.h + */ +static inline int +__iommu_copy_struct_to_user(const struct iommu_user_data *dst_data, + void *src_data, unsigned int data_type, + size_t data_len, size_t min_len) +{ + if (WARN_ON(!dst_data || !src_data)) + return -EINVAL; + if (dst_data->type != data_type) + return -EINVAL; + if (dst_data->len < min_len || data_len < dst_data->len) + return -EINVAL; + return copy_struct_to_user(dst_data->uptr, dst_data->len, src_data, + data_len, NULL); +} + +/** + * iommu_copy_struct_to_user - Report iommu driver specific user space data + * @user_data: Pointer to a struct iommu_user_data for user space data location + * @ksrc: Pointer to an iommu driver specific user data that is defined in + * include/uapi/linux/iommufd.h + * @data_type: The data type of the @ksrc. Must match with @user_data->type + * @min_last: The last member of the data structure @ksrc points in the initial + * version. + * Return 0 for success, otherwise -error. + */ +#define iommu_copy_struct_to_user(user_data, ksrc, data_type, min_last) \ + __iommu_copy_struct_to_user(user_data, ksrc, data_type, sizeof(*ksrc), \ + offsetofend(typeof(*ksrc), min_last)) + /** * struct iommu_ops - iommu ops and capabilities * @capable: check capability