Add a method to check if a PCI device is a Physical Function (PF).

Reviewed-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Peter Colberg <pcolberg@redhat.com>
---
Changes in v2:
- Replace VF -> PF in doc comment of is_physfn().
- Add #[inline] to is_physfn().
---
 rust/kernel/pci.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/rust/kernel/pci.rs b/rust/kernel/pci.rs
index db05641186c3a42922e2b6a463de9c1b099a4673..df39ad3f0d5fd898b034609efb03368f83c2a2e9 100644
--- a/rust/kernel/pci.rs
+++ b/rust/kernel/pci.rs
@@ -484,6 +484,13 @@ pub fn resource_start(&self, bar: u32) -> Result<bindings::resource_size_t> {
         Ok(unsafe { bindings::pci_resource_start(self.as_raw(), bar.try_into()?) })
     }
 
+    /// Returns `true` if this device is a Physical Function (PF).
+    #[inline]
+    pub 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 {

-- 
2.52.0