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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 216.228.117.160 as permitted sender) receiver=protection.outlook.com; client-ip=216.228.117.160; helo=mail.nvidia.com; pr=C Received: from mail.nvidia.com (216.228.117.160) by MWH0EPF000C6195.mail.protection.outlook.com (10.167.249.105) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9791.48 via Frontend Transport; Mon, 20 Apr 2026 13:20:56 +0000 Received: from rnnvmail201.nvidia.com (10.129.68.8) by mail.nvidia.com (10.129.200.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Mon, 20 Apr 2026 06:20:33 -0700 Received: from 82875d6-lcedt.nvidia.com (10.126.230.37) by rnnvmail201.nvidia.com (10.129.68.8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.20; Mon, 20 Apr 2026 06:20:32 -0700 From: Nirmoy Das To: CC: , , , , , , , , , Nirmoy Das Subject: Re: [PATCH v3 1/1] vfio/nvgrace-gpu: Add Blackwell-Next GPU readiness check via CXL DVSEC Date: Mon, 20 Apr 2026 06:20:08 -0700 Message-ID: <20260420132008.521631-1-nirmoyd@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260416014504.63067-1-ankita@nvidia.com> References: <20260416014504.63067-1-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: 8bit Content-Type: text/plain X-ClientProxiedBy: rnnvmail203.nvidia.com (10.129.68.9) To rnnvmail201.nvidia.com (10.129.68.8) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MWH0EPF000C6195:EE_|DM4PR12MB5817:EE_ X-MS-Office365-Filtering-Correlation-Id: 35e9238f-c145-43ef-8f45-08de9edfa7eb X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|36860700016|82310400026|22082099003|56012099003|18002099003; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge1.nvidia.com;CAT:NONE;SFS:(13230040)(1800799024)(376014)(36860700016)(82310400026)(22082099003)(56012099003)(18002099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 1i8ErW+6m9EnCGKewreepWtDLRM5z21juXiCX0taQ2fIQ2q9nf/SqFFz/xdo/2dfonccLB2x+yGoN4OLeRSTu9pAPcAmzfTWSJmjLxOEMZ9CJictIeApYec5gsXi0ulTlgJo7wmb77HNRJmI+fOkH0ledUgPLINvA8ca3lJ2nN/SgXLIrf/vmRKH+9LcoACNAgm2mmX9G+ACb3qAEEzRdHO9NUnphpxe5TMFp0XjvLl0HzItypRgtwLBIyZVx0fe1/fS1/dngW7i4Fcpi52848d+5v5tDWFtmLUimDTRQf0DXl4GwGEMFyWfoPnHNJGrrhPTOObW9Vr5szh3KEncCsuAG0sNn4OsH+p69FxnsiycacLMRQxciKCjvwfbbDgztj+Pm5+Rv1AEHI753WVgIJAmlbbXzXlcu45ekpwm0gDr41KnbqThShyq2lmXZg4+ X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Apr 2026 13:20:56.4946 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 35e9238f-c145-43ef-8f45-08de9edfa7eb X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.160];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: MWH0EPF000C6195.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB5817 On Thu, 16 Apr 2026 01:45:04 +0000, Ankit Agrawal wrote: > Add a CXL DVSEC-based readiness check for Blackwell-Next GPUs alongside > the existing legacy BAR0 polling path. On probe and after reset, the > driver reads the CXL Device DVSEC capability to determine whether the > GPU memory is valid. This is checked by polling on the Memory_Active bit > based on the Memory_Active_Timeout. Also check if MEM_INFO_VALID is set > within 1 second per CXL spec 4.0 Tables 8-13. If not, return error. > > A static inline wrapper dispatches to the appropriate readiness check > based on whether the CXL DVSEC capability is present. > > Add PCI_DVSEC_CXL_MEM_ACTIVE_TIMEOUT to pci_regs.h for the timeout > field encoding. > > Signed-off-by: Ankit Agrawal Tested-and-Acked-by: Nirmoy Das