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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 LY0PR12MB427268.namprd12.prod.outlook.com (2603:10b6:408:3b9::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.21.615.9; Wed, 11 Nov 2026 20:05:53 +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 15.21.0615.007; Wed, 11 Nov 2026 20:05:53 +0000 From: John Hubbard To: Danilo Krummrich Cc: Alexandre Courbot , Timur Tabi , Alistair Popple , Eliot Courtney , Zhi Wang , David Airlie , Simona Vetter , Bjorn Helgaas , =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?q?Bj=C3=B6rn=20Roy=20Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Daniel Almeida , Tamir Duberstein , =?UTF-8?q?Onur=20=C3=96zkan?= , linux-pci@vger.kernel.org, rust-for-linux@vger.kernel.org, nova-gpu@lists.linux.dev, dri-devel@lists.freedesktop.org, LKML , John Hubbard Subject: [PATCH v2 1/1] rust: pci: add domain_nr() accessor Date: Wed, 11 Nov 2026 12:05:49 -0800 Message-ID: <20261111200549.160806-2-jhubbard@nvidia.com> X-Mailer: git-send-email 2.56.1 In-Reply-To: <20261111200549.160806-1-jhubbard@nvidia.com> References: <20261111200549.160806-1-jhubbard@nvidia.com> X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SA1P222CA0172.NAMP222.PROD.OUTLOOK.COM (2603:10b6:806:3c3::28) 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_|LY0PR12MB427268:EE_ X-MS-Office365-Filtering-Correlation-Id: e18a709e-6fba-4f21-98a8-08df402f304f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|23010399003|10070799003|7416014|366016|18002099003|22082099003|6133799003|261009223027099003|11063799006|56012099006|10067099003|261028144727099003|261026140227099003|261102123227099003|261026121527099003|261022105027099003|261021121427099003; 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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?sZXBtRMdSsSL6IE/ghsDYWbqhPWcbd93RmDPKx6y6oJ9gybk1/E06KRxNvp9?= =?us-ascii?Q?d4otbfZs7ZalAeDjtLVLix4sjU9I7tlqhv/ko7jGoNC3zLkKN+HA7pLoKZsP?= =?us-ascii?Q?utq3aqw9m2evrcxrFr+e1uL+TTLwtboil2Tora7RhBKaOjftByD0nWlJcLBY?= =?us-ascii?Q?jPOmi30eicSQOHCKfAJC/eSxV919oUftvA3j9Ve/WuTadvEIsPC2fXoPl3zX?= =?us-ascii?Q?2ShjeKoxG8h64BpOYp/YJgaIU4OH5kEBrNcWYylTLHHatgI4RiaKrPjoc1HW?= =?us-ascii?Q?GYvnFP+0aOgk1T0EDy8OjPHf8EYjUECtUTn5Dy+RKGtjLfLPidRUeZBzZkM7?= =?us-ascii?Q?o/PzqIWWL0aFrXfcUyC1WUGrBOKjxLotEqjzYhdTsC07+BrudHZpnBmfCXfp?= =?us-ascii?Q?XO02jn4QZ7yiE8YbAEr9coVXbG5CMHLuFzwkt3mab+AVZbF9m/ohYu7dwNTU?= =?us-ascii?Q?yVF1POrn2THqtTqsW4AYFm0s53ry0eHyh1fYKmBfSFuPZ8AuddezRh1i8rdF?= =?us-ascii?Q?hW2WPsV31CWJhmkq1XQCGHjM+eQFIVHwRBD/6J9v8VMneuAjOtjbIHqvCQgQ?= =?us-ascii?Q?y34uvlkDfc4JmeFKLZN2V8hqIkURA0zef7ZxVJVTQPgIxq2NuL6FKRfycGzd?= =?us-ascii?Q?mdazNi12h6br2YS6tToYfqSVIU1YrZ48I4oFSZMrgtaUszSpQMsN+sDD1HLM?= =?us-ascii?Q?ly1lDpBvEb0TbopRgQEEv+NT7GpTuldEK98Ic9A1TalXV81CP6DaoVshAxB8?= =?us-ascii?Q?ZDteb7p/yZX9uQt939O3fwZxJAwdnUWf68yvaZfhfcUlWUbmrZOAcsfF+7Dx?= =?us-ascii?Q?F0flLyHmSSKYKQYNbrfpiNkhHX614oI8d+mErqLV/cI/dJB/HEKYWR5VDDKf?= =?us-ascii?Q?bDsgXgG4BcEdZJLD6cS4B1nqOWU2X3/aNMtTNf1uWn23KTbQIOcu9lYUHPKQ?= =?us-ascii?Q?OiY42+upO4rbK0WfBJBc89rKTEoAv44mFnQvrjhsUS9Z0VzbwAojJmjUCcuc?= =?us-ascii?Q?SSmURaLU01YIxN8o1pAYLG4DIdoPbPD6mI6gn2CZhXbLVjkeuBuZF/slm00W?= =?us-ascii?Q?18BYscToCm0QtO36xdj6AVTGtcWuIRQ637/cfdHje5q2Ddneu1Bn+Gwn+pWU?= =?us-ascii?Q?NyjguI1HyJQUXAxUDH8r6HR7efLerCKtt7tSx4w7lXujjRAD1MSrpS4LHqAq?= =?us-ascii?Q?SLsSF2EhHLSA+8Ycp/qD4AhDdSWzASDvTQaSSA7NAmD0jdGWCrIsaMFu7Wxt?= =?us-ascii?Q?/ECt3tfIm7WJggGeessvU7FJOolU014FBsu7MA0cDMlA+P9jGZkMxplloSrW?= =?us-ascii?Q?pZBcxNpkt5JV2Icvui2jK9T377E1t/aLgoTMVSblyRfIWF8vDsO50y4RxIOK?= =?us-ascii?Q?Nf+eR1xiKFAidqXNUrIYnw0JWvBGXQkcSWCxaJL+FoPzXxyu76k648gRzIcf?= =?us-ascii?Q?48XfrwYzzeOOlAB6hcyPfkEKXUSggsXmeWMQSin/gnSm8wXsWze+s1Qboqny?= =?us-ascii?Q?2tbgza8som7NltrDtR4gRSHDBCkVrJ/ugEV7BXz/UmEnYxAzKkgZnUAo/Lcn?= =?us-ascii?Q?qT3fi6S9MFdGcS3k6fNyfqX+yCTg2mIUC8bWwY3DFyJll5C+haeE87x8AO3y?= =?us-ascii?Q?Bs40f7zdiM2T+p0JE+mwtLQWdjW4I/hOtkAcn2u+6Yr8GFlySH7gFjxTjEQk?= =?us-ascii?Q?oLz5gEoVqc+p61mu2LFKwHOw+sSd+kLoVnh6CB6utrP9rJnmFPd0wbcRL0Ed?= =?us-ascii?Q?mI+M9l3WYDee2k2ALzbIqSKP5/50J0Y=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: e18a709e-6fba-4f21-98a8-08df402f304f X-MS-Exchange-CrossTenant-AuthSource: SA1PR12MB5614.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Nov 2026 20:05:52.9276 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: l0Na1KFRtfCZCuOlAQmQMlpaUcqLUOq9JGcGSInABMxWooTpcrXys02zDtFazMekRX9n++GgASH7B6k25v30Mg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: LY0PR12MB427268 The nova-core driver has to send the GPU's PCI location to the GPU's firmware as one word that holds the domain, the bus and the device number. 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. Signed-off-by: John Hubbard --- rust/helpers/pci.c | 5 +++++ rust/kernel/pci.rs | 16 ++++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/rust/helpers/pci.c b/rust/helpers/pci.c index a8540f90b13c..a1e033531419 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_bus *bus) +{ + return pci_domain_nr(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..60e0d8518266 100644 --- a/rust/kernel/pci.rs +++ b/rust/kernel/pci.rs @@ -408,6 +408,22 @@ 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`, which holds a reference to the `struct pci_bus` that its `bus` field + // points to. + let domain_nr = unsafe { bindings::pci_domain_nr((*self.as_raw()).bus) }; + + debug_assert!(domain_nr >= 0); + + // CAST: `pci_domain_nr()` returns an `int`, but a registered bus never has a negative + // domain. A negative value here is a kernel bug rather than a condition for a caller to + // handle. + domain_nr as u32 + } + /// Returns the PCI subsystem vendor ID. #[inline] pub fn subsystem_vendor_id(&self) -> u16 { -- 2.56.1