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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