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Mon, 8 May 2023 21:51:55 -0700 From: Nicolin Chen To: , CC: , , , , , , , , , , Subject: [PATCH RFC v4 1/4] iommu: Add set/unset_dev_user_data ops Date: Mon, 8 May 2023 21:51:47 -0700 Message-ID: X-Mailer: git-send-email 2.40.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT078:EE_|PH7PR12MB6933:EE_ X-MS-Office365-Filtering-Correlation-Id: 40c8e7c2-1559-4be3-f825-08db5049250c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 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)(39860400002)(346002)(396003)(136003)(376002)(451199021)(46966006)(36840700001)(40470700004)(82310400005)(7696005)(6666004)(5660300002)(7416002)(40460700003)(8936002)(8676002)(478600001)(54906003)(110136005)(82740400003)(7636003)(40480700001)(316002)(356005)(41300700001)(4326008)(36756003)(70586007)(70206006)(2616005)(86362001)(2906002)(186003)(83380400001)(47076005)(336012)(36860700001)(426003)(26005);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 May 2023 04:52:08.5623 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 40c8e7c2-1559-4be3-f825-08db5049250c 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: BN8NAM11FT078.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB6933 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 1131476017e2..1e1124f79b56 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -260,6 +260,15 @@ 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 request= s. + * 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 t= he + * include/uapi/linux/iommufd.h. This is used by iommu= fd + * 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 @@ -307,6 +316,10 @@ struct iommu_ops { int (*def_domain_type)(struct device *dev); void (*remove_dev_pasid)(struct device *dev, ioasid_t pasid); =20 + 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; --=20 2.40.1