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Sun, 23 Apr 2023 00:41:08 -0700 From: Nicolin Chen To: , CC: , , , , , , , , , , Subject: [PATCH RFC v3 1/4] iommu: Add set/unset_dev_user_data ops Date: Sun, 23 Apr 2023 00:40:31 -0700 Message-ID: X-Mailer: git-send-email 2.40.0 In-Reply-To: References: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1NAM11FT028:EE_|PH7PR12MB5688:EE_ X-MS-Office365-Filtering-Correlation-Id: 091d7648-9c50-4458-9a72-08db43ce1f43 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: knqzOrVNz+MvWfR6iPRxLDkD/aQOs2k8sJOzDAzAMrgb1sOTSZpovMOq2fKRyw3XJchDgnhtJs/XNgm6Rrq8EoF0T4RF7jeawvAqmxGT/rrlbEfDRLNdWs/rmquaxNseTq0VGhWN8JdSQqVampufhFWTJZsDm0pDU5KCvksBhpQLR/KJx2qJ2OPNd8C703d3znYamvu87QlHUm5sv+b3DRi/ScT7FI6KPB1Ms1oX17NSleOr5Q3pcxl8oNyXQBVOXcYsV5Jgh/l2KZ3iTKaaOpp6GiJvFz6y1dRa0kbhK3tdcOz1X9UDaZh08K7Z77j20mdHuIWBamQUG0zEmXb+d2wqLHTGrshlVzQkiSBRtymefBjuYOpUKytrxFnt1rQ+Ds8mzmk8NES+rr7NIMs6dE4JGmWyKAnrayIDedPOyjQTWdO8ZUscc9UEFClRp7djzWNtkd29cTnICZbMG8WWC/o0p0/6cLBVTuFymgw83qp59h5UbcdsXWpg7jca3Z20/dwVCJdMtWAjsmZRQyyaJktKtUZzGtvfd5tIVfxDZHK0jQ/PTxvutaxQfBPPvW7IMxmCO50vH2s49zr+gHTS2XH+LjoW8JStNuibWIuhmPrpCR4S/k35r5vm5yIuRkJRUgNXzCcbdxO/xhKvSPxmyQETfpKpMok/w2L3wV1cSx1l1fXkqBbK2KH+aJexraVH4LQZhAcO/o+v05EsKGG0JVa88Rff0qydWyTyN9fZAfI= X-Forefront-Antispam-Report: CIP:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230028)(4636009)(376002)(396003)(39860400002)(136003)(346002)(451199021)(36840700001)(46966006)(40470700004)(86362001)(36756003)(82310400005)(2906002)(40480700001)(6666004)(7696005)(36860700001)(34020700004)(186003)(2616005)(47076005)(426003)(336012)(83380400001)(26005)(4326008)(70206006)(70586007)(110136005)(40460700003)(478600001)(316002)(41300700001)(5660300002)(82740400003)(356005)(7636003)(54906003)(7416002)(8936002)(8676002);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Apr 2023 07:41:16.8499 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 091d7648-9c50-4458-9a72-08db43ce1f43 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT028.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB5688 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230423_004123_528453_E6D0465C X-CRM114-Status: GOOD ( 15.45 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The device behind an IOMMU might be used in the user space by a VM. So, it might have some user space data. For example, a device behind an SMMU has a static stream ID. In a virtualization use case, both a host environment and a guest environment have their own Stream IDs. A link (a lookup table) between the physical Stream ID and the virtual (user) Stream ID is needed when the host handles the user cache invalidation commands. Add a pair of new ops to allow user space to forward user_data of a device via iommufd, and a new dev_user_data_len for data structure sanity done by the iommufd core. Signed-off-by: Nicolin Chen --- include/linux/iommu.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 5c99aeaccd1d..33b11d87b374 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -257,6 +257,15 @@ struct iommu_iotlb_gather { * @remove_dev_pasid: Remove any translation configurations of a specific * pasid, so that any DMA transactions with this pasid * will be blocked by the hardware. + * @set/unset_dev_user_data: set/unset an iommu specific device data from user + * space. The user device data info will be used by + * the driver to take care of user space requests. + * The device data structure must be defined in + * include/uapi/linux/iommufd.h. + * @dev_user_data_len: Length of the device data from user space (in bytes), + * simply the "sizeof" the data structure defined in the + * include/uapi/linux/iommufd.h. This is used by iommufd + * core to run a data length validation. * @hw_info_type: One of enum iommu_hw_info_type defined in * include/uapi/linux/iommufd.h. It is used to tag the type * of data returned by .hw_info callback. The drivers that @@ -303,6 +312,10 @@ struct iommu_ops { int (*def_domain_type)(struct device *dev); void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid); + int (*set_dev_user_data)(struct device *dev, const void *user_data); + void (*unset_dev_user_data)(struct device *dev); + size_t dev_user_data_len; + const struct iommu_domain_ops *default_domain_ops; enum iommu_hw_info_type hw_info_type; unsigned long long hwpt_type_bitmap;