From nobody Sat Feb 7 07:24:44 2026 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2074.outbound.protection.outlook.com [40.107.237.74]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9AD7F23B63E; Thu, 4 Sep 2025 04:08:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.237.74 ARC-Seal: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756958924; cv=fail; b=Sff7I8Y7z6nxX1BPcMJ593UdC/XaghHe+mJAbtdXijT9/ZJjn8VBXSMcGNTEBeWBdB+vIa7gMGsdQrc6Rej2F4LQe03NEi9aYKRfwmQxfTx8bNSbEVIuYAo6kwlk8nfplWJdpR7EOZFo/Gf4mleVSg53qgPrd7QkdBjAhjPcOKo= ARC-Message-Signature: i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756958924; c=relaxed/simple; bh=t/x3PIIH49dIA2r4AkyvHyyrIpBnkaK3FkdB7qGrKyo=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=du95RYJ52mXYk0xcQJKdJidc58q5I1c5PHGcnGJol/Kh4cl9grbOtO4VwJbOeH56A26jRihWJyjZC1ct1PzzVcjGxYhta0kB4gMWKfIqr7FQVmbf1lc/dZ3uSBPld36n7Hb50Z9y75BHSse6A5mllV7ZOXLr+2xjrUpB62UF3NU= ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=gNu5uFAJ; arc=fail smtp.client-ip=40.107.237.74 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="gNu5uFAJ" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=dCrUYxmEEzkBPvrQLA6k9DtYkK+OUrZv7lrXvgofYDDBSFjRVU5RnoJY0BVyIqz0i/RYEnMl+VwfIMDvaezoRfIRnqCwnaE9pVW105MXrCzL9M1vBYh0YSmoRcvHHU0zsxwTjcXETcLcr2WWkRrKWwlonOrxPiyPFglzdxGHxm1kC07nkNydFHtNV4i9t/DusEVPwNBNNkwNb89VJItwLRcoWgoTtV62VXv9qOolb84qzofi0oGcUeN3qmN6pvOLlLxFFhaB8f5cnVRBUuXQk99HdaI2Vs7OblRw64L4oZabzGoBk3Qdysm4/0/xhipwtc1ZuuqY4d60q9Po5jhA3w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=MzJ+e4pr6eIhdtuH+3dJ2Ii5jpfG5RP1f6Yx5bd3C50=; b=e894c2QyiNA2m3iTu+EJYvWsf/1J0aJ4NJmrfoRjw2TJdFd0CQPpM8OfCt1lPOTV+8BvYlOMI0+IVRDM+MrnLszfIsgthvjPSUacfVmDnhHhQOBkKW2cWOW4XVGckOEzeYu30ReijwXwl5vmHhNrOpELLAskndVROwg83lkOnwpDPp0HBXsOQueKFPibPnxSmO0Jyap30UJzEaMI6w8dNPmn6uF139lmCtDdcDQTBbd5AflvwKkDJx3Df0GVw9tZkE+VwSxqlky6sQzAnYcaOU2/iw9tTUwU7q3lC9xl5owksI5DkqA8HL0Z9MBSDNua0wsD71J4sMzSsFw0BYRtfg== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 216.228.118.233) smtp.rcpttodomain=vger.kernel.org smtp.mailfrom=nvidia.com; dmarc=pass (p=reject sp=reject pct=100) action=none header.from=nvidia.com; dkim=none (message not signed); arc=none (0) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=MzJ+e4pr6eIhdtuH+3dJ2Ii5jpfG5RP1f6Yx5bd3C50=; b=gNu5uFAJUOxjrkqagF3Zj0mRJsgQ7t++55LU5Hy+sPkTRNLHJ80Z4GOdUVn32TaWaZMd7boED/tqM2DhzETjAykiCUeXjVQFa/XJqwgCQM/7MUCz8+qEhIG4s7cwf0xRIWaT4KFwJmvqGuBUOnJFoM7CmoDzKffaEJpFlrwfn0yYSDte7q3ioGj54ocPF+7+2ao8VNtVuvAP72T+SUFYUtbtAWXYxzIiHwj8/nN5fl/ai6S1nAadsmECm3T/7YRQEj/nuHi1gI9xtPEBfpdR7Pusgv6ReBfcv1yoETkqwnT7ubbx+gsmxwlMmGrf5tWwS/0FmOO1ZU9SWUPW3PgXWw== Received: from SJ0PR13CA0175.namprd13.prod.outlook.com (2603:10b6:a03:2c7::30) by DS0PR12MB8477.namprd12.prod.outlook.com (2603:10b6:8:15b::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9094.18; Thu, 4 Sep 2025 04:08:38 +0000 Received: from SJ5PEPF000001D2.namprd05.prod.outlook.com (2603:10b6:a03:2c7:cafe::c8) by SJ0PR13CA0175.outlook.office365.com (2603:10b6:a03:2c7::30) with Microsoft SMTP Server (version=TLS1_3, cipher=TLS_AES_256_GCM_SHA384) id 15.20.9115.7 via Frontend Transport; Thu, 4 Sep 2025 04:08:38 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 216.228.118.233) smtp.mailfrom=nvidia.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=nvidia.com; Received-SPF: Pass (protection.outlook.com: domain of nvidia.com designates 216.228.118.233 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.118.233; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.118.233) by SJ5PEPF000001D2.mail.protection.outlook.com (10.167.242.54) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9094.14 via Frontend Transport; Thu, 4 Sep 2025 04:08:38 +0000 Received: from drhqmail202.nvidia.com (10.126.190.181) by mail.nvidia.com (10.127.129.6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.14; Wed, 3 Sep 2025 21:08:31 -0700 Received: from drhqmail202.nvidia.com (10.126.190.181) by drhqmail202.nvidia.com (10.126.190.181) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.14; Wed, 3 Sep 2025 21:08:31 -0700 Received: from localhost.nvidia.com (10.127.8.12) by mail.nvidia.com (10.126.190.181) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.14 via Frontend Transport; Wed, 3 Sep 2025 21:08:31 -0700 From: To: , , , , , , , CC: , , , , , , , , , , , , , , Subject: [RFC 06/14] vfio/nvgrace-egm: Introduce egm class and register char device numbers Date: Thu, 4 Sep 2025 04:08:20 +0000 Message-ID: <20250904040828.319452-7-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: SJ5PEPF000001D2:EE_|DS0PR12MB8477:EE_ X-MS-Office365-Filtering-Correlation-Id: b0696b30-f381-4c83-1f0c-08ddeb68b9c5 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|82310400026|376014|36860700013; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?N47in0NsYCmiq33J9wNHeYK7qZsbwZECWHTI2ZUaQ4kSPtBA2RiIlOwOaase?= =?us-ascii?Q?utJFqCDwXfCNvIrqGWKv6NVpohV/9vl6vUIh/E0d49M543gwz3zbRo38G0U0?= =?us-ascii?Q?9n4nvKJV933oPan86xlS4QXPfssBCt7er32rRuFUPMrXtDwRE6oQfJGeJYIj?= =?us-ascii?Q?UkAx5QCgCcp0QOQQmQh3Lt0L1pEJVi1YwycAC0Cclvo2R/WBuRXhb0cKVPFL?= =?us-ascii?Q?e7m9mY/HUcdJgNl92+3Ee6RE1puQw+8mtBYqnWHd2VEqD/CDeO0Bd7rEogtH?= =?us-ascii?Q?C+kdkPye0isb8Gx0WXYvaI46EJNecIpI86iWlWKf9MygFGe1cpXqJjzHauN2?= =?us-ascii?Q?LCiIn3Q+K/lGu9QB3cfnl6PFCsqtjCJcH7Em9lkh7GeJQtXGvsMH1ib081cq?= =?us-ascii?Q?Gp21+sOwETlG74Q81kBZkQaQnEjsSOszkSdw9f0pItqZazjy9ooB4vdMG2z6?= =?us-ascii?Q?ZBasAX4pk1NGoWC/A9f6EWWumRpLmjZGlN16jZVI9Il+GKiuGcb+a669xQHt?= =?us-ascii?Q?r/C/A5JJrkVoTHAO9VEU0kAjo6wH/i+iCjcYz7a3MCbkNs92qB9hf4CV2nka?= =?us-ascii?Q?pMaGQQVFLh3/eXPHSrSvNZyV4LUanp3lxM0UzKMr/TRVRPn3szCBVLV48MAk?= =?us-ascii?Q?0msNCV8S0W2Amur96SrbQZDkPPQF1JLTq+FkT2HW94RF1yOMFeqAPJnM1s7y?= =?us-ascii?Q?bOAFnjixbO6UTgL3wxqmPjprFtu/PziA7RIdaO866y4Z6x60Mg7FsQEbtP6q?= =?us-ascii?Q?T/0FuUKsauOzXjuuQ+XlKr1X33dqF/6sCVls6+jw1xqogFLvMFmA11MD8NP3?= =?us-ascii?Q?SK0odpYxZMmX01uD5Uds8ZmWS+E4XbSM9yX+AzzouAojkyQKErkNOYamxhbe?= =?us-ascii?Q?4RMVVB2HGloxqlNtzo9fu/4j/5Fmv3tORwEUa0a6VNQ3AuNigs7sa2KBFlhq?= =?us-ascii?Q?lb9Ypb4Pa+j4TIWDafmWWFyuMqnXA5TKs488CTzuFBjEO+Oy1UzYZI7t29TH?= =?us-ascii?Q?G2sowUObw7P8GI90WbSnMHklJnZ3AyRILeRS1R8qKut65ZsJZmoKfJhgsRIs?= =?us-ascii?Q?k1XUW52wHVVIoDUupLO9QEhq0Elv6Gw7yMcG00foYaOlYOXujDRlw7WNANbe?= =?us-ascii?Q?HFnIOcLFq5ZUodTl3mfFcBvtaGTCXjlPAEuC4tB1orKX23AZKFqPwcT2FzwJ?= =?us-ascii?Q?KO8t19EYmvYMvoDCyX/Vc1Ngo8gcr7xcGNlA/+fExuBRxdoCjVpdntvMlkV9?= =?us-ascii?Q?k11tmZy7omLWASqLn4qnxfHJVtVLABcoAM0X0NXQNtxqvPDCQvcRbWHDifeF?= =?us-ascii?Q?32QGjWFolxxiKCxJMjsmAYk8OEsiNCuGY874lOOxMjErscWrA80OxMg3c6d7?= =?us-ascii?Q?/+vnBRaqP/M1+stlx+/E9ekF+E6zoUazzBpDGbcfeNARA2lQh/k/3giQMAM/?= =?us-ascii?Q?iF/9gkf+R/3Wcx+cz6Y4Cw10X4+JYPo8A0EhFSfJGGKdQz6w8x3hnN0alrOa?= =?us-ascii?Q?2EXJXXKqDA3s706p+quBC0L9jc68xi6ADruk?= X-Forefront-Antispam-Report: CIP:216.228.118.233;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc7edge2.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(82310400026)(376014)(36860700013);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 04 Sep 2025 04:08:38.2101 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b0696b30-f381-4c83-1f0c-08ddeb68b9c5 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.118.233];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: SJ5PEPF000001D2.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB8477 Content-Type: text/plain; charset="utf-8" From: Ankit Agrawal The EGM regions are exposed to the userspace as char devices. A unique char device with a different minor number is assigned to EGM region belonging to a different Grace socket. Add a new egm class and register a range of char device numbers for the same. Setting MAX_EGM_NODES as 4 as the 4-socket is the largest configuration on Grace based systems. Suggested-by: Aniket Agashe Signed-off-by: Ankit Agrawal --- drivers/vfio/pci/nvgrace-gpu/egm.c | 36 ++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/drivers/vfio/pci/nvgrace-gpu/egm.c b/drivers/vfio/pci/nvgrace-= gpu/egm.c index 999808807019..6bab4d94cb99 100644 --- a/drivers/vfio/pci/nvgrace-gpu/egm.c +++ b/drivers/vfio/pci/nvgrace-gpu/egm.c @@ -4,14 +4,50 @@ */ =20 #include +#include + +#define MAX_EGM_NODES 4 + +static dev_t dev; +static struct class *class; + +static char *egm_devnode(const struct device *device, umode_t *mode) +{ + if (mode) + *mode =3D 0600; + + return NULL; +} =20 static int __init nvgrace_egm_init(void) { + int ret; + + /* + * Each EGM region on a system is represented with a unique + * char device with a different minor number. Allow a range + * of char device creation. + */ + ret =3D alloc_chrdev_region(&dev, 0, MAX_EGM_NODES, + NVGRACE_EGM_DEV_NAME); + if (ret < 0) + return ret; + + class =3D class_create(NVGRACE_EGM_DEV_NAME); + if (IS_ERR(class)) { + unregister_chrdev_region(dev, MAX_EGM_NODES); + return PTR_ERR(class); + } + + class->devnode =3D egm_devnode; + return 0; } =20 static void __exit nvgrace_egm_cleanup(void) { + class_destroy(class); + unregister_chrdev_region(dev, MAX_EGM_NODES); } =20 module_init(nvgrace_egm_init); --=20 2.34.1