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charset=UTF-8 Date: Sun, 06 Sep 2026 10:24:39 +0900 Message-Id: Cc: , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v9 1/1] rust: pci: add extended capability and SR-IOV support From: "Alexandre Courbot" To: "Zhi Wang" References: <2e9d992509299c2f13de48109c4c933f53817acb.1787830828.git.zhiw@nvidia.com> In-Reply-To: <2e9d992509299c2f13de48109c4c933f53817acb.1787830828.git.zhiw@nvidia.com> X-ClientProxiedBy: TY6PR01CA0014.jpnprd01.prod.outlook.com (2603:1096:405:3bc::7) To MW4PR12MB6873.namprd12.prod.outlook.com (2603:10b6:303:20c::17) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: MW4PR12MB6873:EE_|CYYPR12MB8937:EE_ X-MS-Office365-Filtering-Correlation-Id: aa26effd-3e7e-4323-7845-08df0bb5a0bd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|376014|1800799024|10070799003|23010399003|366016|22082099003|18002099003|6133799003|11063799006|4143699003|56012099006|10067099003; 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Expose > this information through the Rust PCI abstraction so drivers can use the > existing typed configuration-space accessors instead of raw bindings. > > Define ExtCapability to associate a capability ID with a register layout, > and add ConfigSpace::find_ext_capability() to locate and project that > layout. Bound the view at the next capability or the end of extended > configuration space. Add ExtSriovRegs and a decoded VF BAR iterator that > reads and validates all six VF BAR register slots up front, yields decode= d > BAR addresses and widths in logical order, and keeps the raw > configuration-space slot advancement internal. Since PCI_EXT_CAP_NEXT() i= s > a function-like macro, expose it through a Rust helper. > > Keep raw SR-IOV registers private because PCI core owns their state. Expo= se > the current First VF Offset through a read-only accessor because the Nova > GSP ABI needs the raw 16-bit First VF Offset in Routing ID space. The > pci_iov_virtfn_devfn() helper instead returns the low eight bits of a > calculated VF Routing ID. > > Link: https://lore.kernel.org/rust-for-linux/20260818084633.1673214-2-zhi= w@nvidia.com/ > Cc: Alexandre Courbot > Cc: Gary Guo > Signed-off-by: Zhi Wang Reviewed-by: Alexandre Courbot