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dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from SA1PR12MB5614.namprd12.prod.outlook.com (2603:10b6:806:228::7) by SA1PR12MB9514.namprd12.prod.outlook.com (2603:10b6:806:458::7) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.592.13; Tue, 10 Nov 2026 03:37:00 +0000 Received: from SA1PR12MB5614.namprd12.prod.outlook.com ([fe80::1a0c:e9e8:f3a5:d9d6]) by SA1PR12MB5614.namprd12.prod.outlook.com ([fe80::1a0c:e9e8:f3a5:d9d6%6]) with mapi id 15.21.0592.010; Tue, 10 Nov 2026 03:37:00 +0000 From: John Hubbard To: Danilo Krummrich , Alexandre Courbot Cc: Timur Tabi , Alistair Popple , Eliot Courtney , Zhi Wang , David Airlie , Simona Vetter , Bjorn Helgaas , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , nova-gpu@lists.linux.dev, dri-devel@lists.freedesktop.org, LKML , linux-pci@vger.kernel.org, rust-for-linux@vger.kernel.org, John Hubbard Subject: [PATCH 1/2] rust: pci: add domain_nr() accessor Date: Mon, 9 Nov 2026 19:36:53 -0800 Message-ID: <20261110033655.148487-2-jhubbard@nvidia.com> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261110033655.148487-1-jhubbard@nvidia.com> References: <20261110033655.148487-1-jhubbard@nvidia.com> X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BY3PR04CA0029.namprd04.prod.outlook.com (2603:10b6:a03:217::34) To SA1PR12MB5614.namprd12.prod.outlook.com (2603:10b6:806:228::7) X-Mailing-List: nova-gpu@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA1PR12MB5614:EE_|SA1PR12MB9514:EE_ X-MS-Office365-Filtering-Correlation-Id: e3975605-a176-449e-43ef-08df3edbe0ff X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|7416014|376014|23010399003|18002099003|22082099003|6133799003|10067099003|11063799006|56012099006|261102123227099003|261026121527099003|261028144727099003|261022105027099003|261009223027099003|261021121427099003|261026140227099003; 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The PCI abstraction has dev_id(), which packs the bus, the device and the function into one value. It has no accessor that reports the domain. Add an accessor for the domain number. Suggested-by: Miguel Ojeda Signed-off-by: John Hubbard --- rust/helpers/pci.c | 5 +++++ rust/kernel/pci.rs | 14 ++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/rust/helpers/pci.c b/rust/helpers/pci.c index a8540f90b13c..49f2c089d236 100644 --- a/rust/helpers/pci.c +++ b/rust/helpers/pci.c @@ -7,6 +7,11 @@ __rust_helper u16 rust_helper_pci_dev_id(struct pci_dev *dev) return PCI_DEVID(dev->bus->number, dev->devfn); } +__rust_helper int rust_helper_pci_domain_nr(struct pci_dev *dev) +{ + return pci_domain_nr(dev->bus); +} + __rust_helper resource_size_t rust_helper_pci_resource_start(struct pci_dev *pdev, int bar) { diff --git a/rust/kernel/pci.rs b/rust/kernel/pci.rs index 769d01d23429..57718e48208d 100644 --- a/rust/kernel/pci.rs +++ b/rust/kernel/pci.rs @@ -408,6 +408,20 @@ pub fn dev_id(&self) -> u16 { unsafe { bindings::pci_dev_id(self.as_raw()) } } + /// Returns the PCI domain number of the bus that this device is on. + #[inline] + pub fn domain_nr(&self) -> u32 { + // SAFETY: By its type invariant `self.as_raw` is always a valid pointer to a + // `struct pci_dev`. + let domain_nr = unsafe { bindings::pci_domain_nr(self.as_raw()) }; + + // CAST: `pci_domain_nr()` returns an `int`, but a registered bus never has a negative + // domain, because `pci_register_host_bridge()` fails when the domain allocation fails. + // A negative value here is a kernel bug rather than a condition for a caller to handle. + debug_assert!(domain_nr >= 0); + domain_nr as u32 + } + /// Returns the PCI subsystem vendor ID. #[inline] pub fn subsystem_vendor_id(&self) -> u16 { -- 2.56.0