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Tue, 13 Sep 2022 01:24:58 -0700 From: Nicolin Chen To: , , , , , , , , , , , , , , , , , , CC: , , , , , , , , , , , , , , , , Subject: [PATCH 3/5] iommu: Add return errno rules to ->attach_dev ops Date: Tue, 13 Sep 2022 01:24:46 -0700 Message-ID: <20220913082448.31120-4-nicolinc@nvidia.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220913082448.31120-1-nicolinc@nvidia.com> References: <20220913082448.31120-1-nicolinc@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN8NAM11FT087:EE_|BN9PR12MB5244:EE_ X-MS-Office365-Filtering-Correlation-Id: e4a303aa-49a3-482a-f547-08da956173cf 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:12.22.5.234;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230022)(4636009)(136003)(376002)(346002)(39860400002)(396003)(451199015)(46966006)(40470700004)(36840700001)(316002)(5660300002)(70206006)(40460700003)(7416002)(186003)(426003)(7696005)(40480700001)(336012)(478600001)(36756003)(82310400005)(4326008)(110136005)(47076005)(921005)(83380400001)(1076003)(356005)(8676002)(7406005)(36860700001)(70586007)(2616005)(41300700001)(26005)(2906002)(86362001)(54906003)(82740400003)(6666004)(81166007)(8936002)(36900700001)(2101003)(83996005);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Sep 2022 08:25:01.1846 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e4a303aa-49a3-482a-f547-08da956173cf X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.234];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT087.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN9PR12MB5244 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 errno to ->attach_dev ops. 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..c5d7ec0187c7 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 + * Rules of its return errno: + * EINVAL - Exclusively, device and domain are incompatible= . Must + * avoid kernel prints along with this errno. Any = EINVAL + * returned from kAPIs 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 ch= anged + * ENODEV - Device specific errors, not able to be attached + * - Treated as ENODEV by the caller. Use is discour= aged * @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 --=20 2.17.1