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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 CY4PEPF0000E9DB.mail.protection.outlook.com (10.167.241.74) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.315.6 via Frontend Transport; Tue, 11 Aug 2026 16:47:29 +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 15.2.2562.45; Tue, 11 Aug 2026 09:47:08 -0700 Received: from vidyas-server.nvidia.com (10.126.231.37) 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; Tue, 11 Aug 2026 09:47:05 -0700 From: Vidya Sagar To: CC: , , , , , , , , Vidya Sagar Subject: [PATCH V2 1/4] PCI: Add DEV3 14-Bit Tag Requester register definitions Date: Tue, 11 Aug 2026 22:16:37 +0530 Message-ID: <20260811164640.587078-2-vidyas@nvidia.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260512163012.2336191-1-vidyas@nvidia.com> References: <20260512163012.2336191-1-vidyas@nvidia.com> Precedence: bulk X-Mailing-List: linux-pci@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public 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: CY4PEPF0000E9DB:EE_|MW4PR12MB7214:EE_ X-MS-Office365-Filtering-Correlation-Id: f2b94c9b-e088-4061-4d1e-08def7c83b69 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|23010399003|376014|36860700016|1800799024|82310400026|6133799003|10067099003|56012099006|11063799006|5023799004|22082099003|18002099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: TaHo98nznY9RBl640dfWCU14alF/Wuq+XIxyt3PUkHt0apy/Xol/XmxpjPVQWr2/45v9aeKj5tfBfZ2zPILXjl9nLY3RzFTor5UpmOK4zSnNkmXzsJFy8/BlkTL/DFZA5kGL6Q5zu/dlgYe+Oj2YnUp/pBhz9FAsVMCug97fV99QAS6g/LkPDxPfQcqoQCgpImKtBBo/fLFQOgm/+3owysBZ7MD60sMKzlTedKzGLlSGFeE5WSne8poLsHpwtghRr9UuybgpSH7IPbNUsAcPX1KNTMEI9VfijVqL5peKg6hndFwP7aabGHisRyv8QNmgoGmaqNZZtsC70uXElBD6Ei6kKiQGrtybhHlnxzBO6ve3o+HUnmKrrtC5NSvqfIri8SXCWMqTFsss4XeRPM8qWombIRbDyi7oM5lCt2daubensCpc4peQTzsVhiDQ5dK8 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Aug 2026 16:47:29.4108 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f2b94c9b-e088-4061-4d1e-08def7c83b69 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: CY4PEPF0000E9DB.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7214 The Device 3 Extended Capability advertises 14-Bit Tag Requester support in bit 2 of the Device 3 Capabilities register and carries the matching enable in bit 2 of the Device 3 Control register. Only the register offsets and DEV3_STA.Segment Captured are defined today. Add both 14-Bit Tag Requester bit definitions. There is deliberately no completer counterpart: a completer reflects the Tag field of the request it answers, so the spec defines a 14-Bit Tag Completer Supported bit but no completer enable, and software has nothing to program there. No functional change. Signed-off-by: Vidya Sagar --- V2: * New patch as a result of splitting the V1 monolithic patch include/uapi/linux/pci_regs.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h index facaa324bd86..b2ba5c2642f0 100644 --- a/include/uapi/linux/pci_regs.h +++ b/include/uapi/linux/pci_regs.h @@ -1254,7 +1254,9 @@ /* Device 3 Extended Capability */ #define PCI_DEV3_CAP 0x04 /* Device 3 Capabilities Register */ +#define PCI_DEV3_CAP_14BIT_TAG_REQ 0x00000004 /* 14-Bit Tag Requester Supported */ #define PCI_DEV3_CTL 0x08 /* Device 3 Control Register */ +#define PCI_DEV3_CTL_14BIT_TAG_REQ_EN 0x00000004 /* 14-Bit Tag Requester Enable */ #define PCI_DEV3_STA 0x0c /* Device 3 Status Register */ #define PCI_DEV3_STA_SEGMENT 0x8 /* Segment Captured (end-to-end flit-mode detected) */ -- 2.43.0