[PATCH v3 04/10] rust: pci: add is_physfn(), to check for PFs

[Zhi Wang]

From: Peter Colberg <peter@xxxxxxxxxxx>

Add an internal method to check if a PCI device is a Physical Function
(PF). The SR-IOV implementation uses this role check to validate
configuration requests.

Reviewed-by: Joel Fernandes <joelagnelf@xxxxxxxxxx>
Signed-off-by: Peter Colberg <peter@xxxxxxxxxxx>
Signed-off-by: Zhi Wang <zhiw@xxxxxxxxxx>
---
 rust/kernel/pci/iov.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/rust/kernel/pci/iov.rs b/rust/kernel/pci/iov.rs
index 272ed677f145..a4a23a9ea77a 100644
--- a/rust/kernel/pci/iov.rs
+++ b/rust/kernel/pci/iov.rs
@@ -12,6 +12,14 @@
 };
 
 impl Device {
+    /// Returns `true` if this device is a Physical Function (PF).
+    #[inline]
+    #[expect(dead_code)]
+    pub(crate) fn is_physfn(&self) -> bool {
+        // SAFETY: `self.as_raw` is a valid pointer to a `struct pci_dev`.
+        unsafe { (*self.as_raw()).is_physfn() != 0 }
+    }
+
     /// Returns `true` if this device is a Virtual Function (VF).
     #[inline]
     pub fn is_virtfn(&self) -> bool {
-- 
2.53.0