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Mon, 21 Oct 2024 17:20:36 -0700 From: Nicolin Chen To: , , CC: , , , , , , , , , , , , , , , , , , , Subject: [PATCH v4 07/14] iommu: Add iommu_copy_struct_from_full_user_array helper Date: Mon, 21 Oct 2024 17:20:16 -0700 Message-ID: <63579e493cd66965cc830906fd1f152d9467bace.1729555967.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: BL02EPF0001A108:EE_|DS0PR12MB7677:EE_ X-MS-Office365-Filtering-Correlation-Id: 9a1554a0-64c6-4fdf-1a62-08dcf22f63b9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|36860700013|7416014|376014|82310400026|1800799024; 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)(36860700013)(7416014)(376014)(82310400026)(1800799024); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Oct 2024 00:20:52.8196 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9a1554a0-64c6-4fdf-1a62-08dcf22f63b9 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: BL02EPF0001A108.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB7677 From: Jason Gunthorpe The iommu_copy_struct_from_user_array helper can be used to copy a single entry from a user array which might not be efficient if the array is big. Add a new iommu_copy_struct_from_full_user_array to copy the entire user array at once. Update the existing iommu_copy_struct_from_user_array kdoc accordingly. Signed-off-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- include/linux/iommu.h | 49 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 48 insertions(+), 1 deletion(-) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 14f24b5cd16f..8105079ba5d9 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -493,7 +493,9 @@ static inline int __iommu_copy_struct_from_user_array( * @index: Index to the location in the array to copy user data from * @min_last: The last member of the data structure @kdst points in the * initial version. - * Return 0 for success, otherwise -error. + * + * Copy a single entry from a user array. Return 0 for success, otherwise + * -error. */ #define iommu_copy_struct_from_user_array(kdst, user_array, data_type, index, \ min_last) \ @@ -501,6 +503,51 @@ static inline int __iommu_copy_struct_from_user_array( kdst, user_array, data_type, index, sizeof(*(kdst)), \ offsetofend(typeof(*(kdst)), min_last)) + +/** + * iommu_copy_struct_from_full_user_array - Copy iommu driver specific user + * space data from an iommu_user_data_array + * @kdst: Pointer to an iommu driver specific user data that is defined in + * include/uapi/linux/iommufd.h + * @kdst_entry_size: sizeof(*kdst) + * @user_array: Pointer to a struct iommu_user_data_array for a user space + * array + * @data_type: The data type of the @kdst. Must match with @user_array->type + * + * Copy the entire user array. kdst must have room for kdst_entry_size * + * user_array->entry_num bytes. Return 0 for success, otherwise -error. + */ +static inline int +iommu_copy_struct_from_full_user_array(void *kdst, size_t kdst_entry_size, + struct iommu_user_data_array *user_array, + unsigned int data_type) +{ + unsigned int i; + int ret; + + if (user_array->type != data_type) + return -EINVAL; + if (!user_array->entry_num) + return -EINVAL; + if (likely(user_array->entry_len == kdst_entry_size)) { + if (copy_from_user(kdst, user_array->uptr, + user_array->entry_num * + user_array->entry_len)) + return -EFAULT; + } + + /* Copy item by item */ + for (i = 0; i != user_array->entry_num; i++) { + ret = copy_struct_from_user( + kdst + kdst_entry_size * i, kdst_entry_size, + user_array->uptr + user_array->entry_len * i, + user_array->entry_len); + if (ret) + return ret; + } + return 0; +} + /** * struct iommu_ops - iommu ops and capabilities * @capable: check capability