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Tue, 13 Sep 2022 22:12:38 -0700 Received: from drhqmail201.nvidia.com (10.126.190.180) by rnnvmail204.nvidia.com (10.129.68.6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.29; Tue, 13 Sep 2022 22:12:38 -0700 Received: from drhqmail201.nvidia.com (10.126.190.180) by drhqmail201.nvidia.com (10.126.190.180) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.29; Tue, 13 Sep 2022 22:12:37 -0700 Received: from Asurada-Nvidia.nvidia.com (10.127.8.11) by mail.nvidia.com (10.126.190.180) with Microsoft SMTP Server id 15.2.986.29 via Frontend Transport; Tue, 13 Sep 2022 22:12:36 -0700 From: Nicolin Chen To: , , , , , , , , , , , , , , , , , , CC: , , , , , , , , , , , , , , , , , , Subject: [PATCH v2 03/13] iommu: Add return value rules to attach_dev op Date: Tue, 13 Sep 2022 22:12:34 -0700 Message-ID: <20220914051234.10006-2-nicolinc@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220914051234.10006-1-nicolinc@nvidia.com> References: <20220914051234.10006-1-nicolinc@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT096:EE_|BY5PR12MB4273:EE_ X-MS-Office365-Filtering-Correlation-Id: 8d251b98-5dd8-492c-c823-08da960fc751 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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PTR:dc6edge2.nvidia.com; CAT:NONE; SFS:(13230022)(4636009)(39860400002)(376002)(136003)(346002)(396003)(451199015)(46966006)(40470700004)(36840700001)(36860700001)(40460700003)(36756003)(40480700001)(356005)(921005)(7636003)(86362001)(82740400003)(41300700001)(70586007)(70206006)(8936002)(4326008)(8676002)(5660300002)(26005)(7406005)(7416002)(82310400005)(7696005)(110136005)(478600001)(54906003)(83380400001)(2906002)(47076005)(426003)(316002)(2616005)(336012)(1076003)(186003)(83996005)(2101003); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Sep 2022 05:12:53.7016 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8d251b98-5dd8-492c-c823-08da960fc751 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: BN8NAM11FT096.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4273 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Cases like VFIO wish to attach a device to an existing domain that was not allocated specifically from the device. This raises a condition where the IOMMU driver can fail the domain attach because the domain and device are incompatible with each other. This is a soft failure that can be resolved by using a different domain. Provide a dedicated errno EINVAL from the IOMMU driver during attach that the reason attached failed is because of domain incompatability. VFIO can use this to know attach is a soft failure and it should continue searching. Otherwise the attach will be a hard failure and VFIO will return the code to userspace. Update kdocs first to add rules of return value to the attach_dev op. Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- include/linux/iommu.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/iommu.h b/include/linux/iommu.h index ea30f00dc145..aacf9a2b151f 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -266,6 +266,17 @@ struct iommu_ops { /** * struct iommu_domain_ops - domain specific operations * @attach_dev: attach an iommu domain to a device + * Return: + * * 0 - success + * * EINVAL - exclusively, device and domain are incompatible. Must avoid + * kernel prints along with this errno. Any EINVAL returned from + * a kAPI must be converted to ENODEV if it is device-specific, + * or to some other reasonable errno being listed below + * * ENOMEM - out of memory + * * ENOSPC - no space left on device + * * EBUSY - device is attached to a domain and cannot be changed + * * ENODEV - device specific errors, not able to be attached + * * - treated as ENODEV by the caller. Use is discouraged * @detach_dev: detach an iommu domain from a device * @map: map a physically contiguous memory region to an iommu domain * @map_pages: map a physically contiguous set of pages of the same size to