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Wed, 3 Sep 2025 21:08:31 -0700 From: To: , , , , , , , CC: , , , , , , , , , , , , , , Subject: [RFC 07/14] vfio/nvgrace-egm: Register auxiliary driver ops Date: Thu, 4 Sep 2025 04:08:21 +0000 Message-ID: <20250904040828.319452-8-ankita@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20250904040828.319452-1-ankita@nvidia.com> References: <20250904040828.319452-1-ankita@nvidia.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SN1PEPF0002529D:EE_|MW4PR12MB7030:EE_ X-MS-Office365-Filtering-Correlation-Id: 881c359f-2940-4957-5a2c-08ddeb68bb49 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|36860700013|82310400026|376014|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?IrlW6iJ8cyUQK0d1TifnTG1VDoHw382s5mIh/VGnlGoQwbu42lW08FzNGu+D?= =?us-ascii?Q?546VVvXno7hmBu4ayTqY2pz0AHKSM/WwE+ys0YL7RN/bYDmZJi05wM38uuRX?= =?us-ascii?Q?qlavQQ04iv5D2ESZQf6ysZ9/xYMyOPX6RxvM6XDNR06Opj/3x7ZoKmOg1/1e?= =?us-ascii?Q?pvnJy50Mx2p/VqMjp3VTiNZ0ZBAa6VNbnXrJE4u7KQt7tkOOpeSl10Vr+cew?= =?us-ascii?Q?4IkSAhwM6G0SkmNMoIloYmjH1pvG7VcqySW133IaD6BQ1ckPTyRan+nlNgTt?= =?us-ascii?Q?nqaSfR3CyglgzB7f1FCwhdc5wffrZzWggunry3z19AzpOUNA6/46pQs+Tin1?= =?us-ascii?Q?j3o2vX7dKb9QV8gKFFrqLT72eBnSAxJBbMdYg2EKMPUAcoxrR6M94FA5hM2S?= =?us-ascii?Q?eOrBEoFZjBAF6GBNtNCjDVeSqV94tEd6QUVWYKd97DZhIOG0MwVb0MtQMyXV?= =?us-ascii?Q?Y+JH0xoD9a2GHgU8FsH/fNNmuLwP08cM3iY6wZOlR26Ql9+WhabCsyq20FOo?= =?us-ascii?Q?Qg4IFLENIPOkBKU8EG3YJ47wNJqE5gLERMz6pAAXU5Cdka0yG++nj5EfEXqo?= =?us-ascii?Q?rlYKHch68877wOg4KgJ8sX6t7lBogwWpzerlDbhfd72+wCKJuGOS57CfXiC1?= =?us-ascii?Q?E4UHS2HufzVqaV1196dpKF/B9h7RbiImI8pR9cX2Y9+x2JejU8d9FBXqjjkK?= =?us-ascii?Q?iwS96H8YZcgxh8mgmhKDWPqrufwmoDiW+KFyZk5HLJn3p86uor91mzUenrcH?= =?us-ascii?Q?i3/HxAjEn4DNFOsp+VWAC+D+ftTkMQVXYrUWPseiAZXYlpoa6ZqhcgbKcE6e?= =?us-ascii?Q?CZBMDMOy3zzjcm932md9v7Ki51D0V8zUkvPPaodrLdeW36GNzNYqkGlaKQOX?= =?us-ascii?Q?U1oB7A4BeUkks7dmYrtEpnxSSPB90X7HCy9qcbvacVktkmTB5/frV6t3n7/E?= =?us-ascii?Q?EgKrLxiyr8NiGSqkcnWzRa/Sluj72sTVEDnt+eWHu0b7COl1L2oRWrLPtv45?= =?us-ascii?Q?ifJPiSRaCxgjvKA2eUF0A2bmEpmlViZeYFwTCRj15qpsMHOHgwLOM91Mo9+l?= =?us-ascii?Q?iDZLxjt/++GYueONjMsq+Nkr3F0w+UwlNP1wWBnlMbfyiBSq4qnleA7/iwAO?= =?us-ascii?Q?JUUUV5JynDJx0dVBSNKqQRXJ1sve3Lz0/zzdv2jRtAAavirl9pgPSgKCKd8n?= =?us-ascii?Q?8pQOlnVdNPRjXl04Ll4WVH6gzp/Zesv4RcAq1h/frxGOqN8KTGYLGIqyVzbf?= =?us-ascii?Q?xoj2nbm9hIzZAYkaKWqg7DACr3LZjD25v/J3DAW90Kw3O4mw2Yej03Z6y/0K?= =?us-ascii?Q?fEW+/kp+AG/ghQ7FVEgRfq6V0uuTSizdRRMH1HCa5uMKNm9bVBJvYIzMXinx?= =?us-ascii?Q?zrU2XB68WJplaVtQUCUk4s31B8R3uW4pernMvZw7u6MBT7Xcb1102hiDzqHM?= =?us-ascii?Q?VeMnbGj+tzsGHvx59YFN2kTFFltPcLYpZXctEOQO9FFdq4nnhvjFbXt94i+V?= =?us-ascii?Q?18kLPNgqMneCsjqaAht2wGpFwglgg4hjbanw?= 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)(36860700013)(82310400026)(376014)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Sep 2025 04:08:40.6323 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 881c359f-2940-4957-5a2c-08ddeb68bb49 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: SN1PEPF0002529D.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7030 Content-Type: text/plain; charset="utf-8" From: Ankit Agrawal Setup dummy auxiliary device ops to be able to get probed by the nvgrace-egm auxiliary driver. Both nvgrace-gpu and the out-of-tree nvidia-vgpu-vfio will make use of the EGM for device assignment and the SRIOV vGPU virtualization solutions respectively. Hence allow auxiliary device probing for both. Signed-off-by: Ankit Agrawal --- drivers/vfio/pci/nvgrace-gpu/egm.c | 39 +++++++++++++++++++++++++++--- 1 file changed, 36 insertions(+), 3 deletions(-) diff --git a/drivers/vfio/pci/nvgrace-gpu/egm.c b/drivers/vfio/pci/nvgrace-= gpu/egm.c index 6bab4d94cb99..12d4e6e83fff 100644 --- a/drivers/vfio/pci/nvgrace-gpu/egm.c +++ b/drivers/vfio/pci/nvgrace-gpu/egm.c @@ -11,6 +11,30 @@ static dev_t dev; static struct class *class; =20 +static int egm_driver_probe(struct auxiliary_device *aux_dev, + const struct auxiliary_device_id *id) +{ + return 0; +} + +static void egm_driver_remove(struct auxiliary_device *aux_dev) +{ +} + +static const struct auxiliary_device_id egm_id_table[] =3D { + { .name =3D "nvgrace_gpu_vfio_pci.egm" }, + { .name =3D "nvidia_vgpu_vfio.egm" }, + { }, +}; +MODULE_DEVICE_TABLE(auxiliary, egm_id_table); + +static struct auxiliary_driver egm_driver =3D { + .name =3D KBUILD_MODNAME, + .id_table =3D egm_id_table, + .probe =3D egm_driver_probe, + .remove =3D egm_driver_remove, +}; + static char *egm_devnode(const struct device *device, umode_t *mode) { if (mode) @@ -35,19 +59,28 @@ static int __init nvgrace_egm_init(void) =20 class =3D class_create(NVGRACE_EGM_DEV_NAME); if (IS_ERR(class)) { - unregister_chrdev_region(dev, MAX_EGM_NODES); - return PTR_ERR(class); + ret =3D PTR_ERR(class); + goto unregister_chrdev; } =20 class->devnode =3D egm_devnode; =20 - return 0; + ret =3D auxiliary_driver_register(&egm_driver); + if (!ret) + goto fn_exit; + + class_destroy(class); +unregister_chrdev: + unregister_chrdev_region(dev, MAX_EGM_NODES); +fn_exit: + return ret; } =20 static void __exit nvgrace_egm_cleanup(void) { class_destroy(class); unregister_chrdev_region(dev, MAX_EGM_NODES); + auxiliary_driver_unregister(&egm_driver); } =20 module_init(nvgrace_egm_init); --=20 2.34.1