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Fri, 25 Oct 2024 16:50:55 -0700 From: Nicolin Chen To: , , CC: , , , , , , , , , , , , , , , , , , , Subject: [PATCH v5 06/13] iommu: Add iommu_copy_struct_from_full_user_array helper Date: Fri, 25 Oct 2024 16:50:35 -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: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF000023CF:EE_|DM3PR12MB9286:EE_ X-MS-Office365-Filtering-Correlation-Id: c41ae62f-8913-4f9c-6040-08dcf54fe3a4 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: ChXZONn76KBOjkwoLR5vTSqntVxZQW2paeEF1wk+QUyAvO/l1034OpnrN+QtJOcg8OD5fjh14H0dHYdVY7Mz/N1NpZLSX6MhKVwaWWB1Kvl7jP2HxzIWrs8jXnzxgr9D7837fdPs1LXSttYHTPQNDmLyAjxedpKoNvIQcffaPpfWZYuf/m0b8az/McJiUwzUdAglNbxYQU3EMt77QxVaVhrdtJ22f4USRiZx9KrP4IIvwHJ4XlK7IAXBQ8qOh5tURq6lrzw217eU3vBgsClufAgGjRQOVYi83XOYqKWRUesgXtxKKFb4d17L4JAp47eKNH9ELHwzQ0wfR9XhxxR3xL4JSYw5lW8LRxSKYb5v/ARPGulEu8oJQAr2Qxv25r7OREflmwqoZ+NKJnsDKQOxfpghpiPvNIvOHck4mSdnyVJlczQoC+BSDYPltR/xYm4d5N0/VeHJU8wKGnkY44CPyHaFPxq0WZqB5/vAEIdvkSCH1ev7oLhdOzXbShF7F3YRylWkhL++ih5eS6vppMxNRIgq72KUyeJq4H/0hXDDZTtcuIU2OhzZzAMswBO5hCnIuhaL0OT3hBTeA1EGFuPhWuVU1mg++eQTwMDl9fuDg/JYO4Y9wJDCH+T7wrcyJkz+DOqdgwn0bi4d3xWxpRFlCbcjLpJwHjURm7x0OfQnvLcbukFPriDNq5gAa5dtkYOcnw5TBWj97wPNaFPegi/oHqCWZoNjdy9jHdtHoLFVdzcqGaOfVi//CpvrfG3i9ZhCLKZqnB4dFyKIXoa2WFrZH6tQh46iCXGbvPBIdTMx3AhouVC4BIarjxkncwDFsVPww/D/U6FRhacB7Zcf94UCkM4eYyZGUbgHaaDh1+tCyYPkMmLSFIyE7Mki1ju3KSyXuAdlZH7yjjkcqk0o5jlXwupeoS8X/xz0eib2VkxwBNJogRBIdkGLCWzjSlT3aedNkutoqZysls9cmz7RLCs0TnVL5wacnj0VDreywmN0FjHFednELyHGDJXu1OzbnZapkJI2aFnojiTGVLFjSmq8ILnQN5DVg6C7lb94GtSzcWmxYHLswUrooFinkPWP9lRkmlOhcGNQ4jyPcj78tFWMmFW7ha0Isxh1XlT8Gw1stbeodJvgaPXjb5VQmMK+tCmxJLTg5f2OUMWYTDlP30KmKFYn4Dc6U1s6sYuvTPGd0i8yWiWJ3jKUFe7lZpLRGsr2Sir9w6hgMPb4MMFu/PTdTVtCL8BDaoqundsvgzLVviq1R/tX2HM+avK5mQm8H6QdSxrSdG7lUTYIoU+ktM47LF/7L0SAOGRCG2O86EWEbmdyiwlqfLyrwKLhFop+Qprf60aOjltn1aaJtK/UFDlHxHUg75GTX8MFpc8MHaQgbhail44z6OWv25ptreWry5qBJB1rNIPDhGtO105yoxZU2A== 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 23:51:04.9721 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c41ae62f-8913-4f9c-6040-08dcf54fe3a4 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: DM3PR12MB9286 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 | 48 ++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 47 insertions(+), 1 deletion(-) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 14f24b5cd16f..3c3d5d0849d7 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 +503,50 @@ 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