pci: Implementing Debug for PciBdf to aid with debugging

Signed-off-by: Arvind Vasudev <avasudev@crusoeenergy.com>

pci/src/lib.rs

@@ -16,7 +16,7 @@ mod msix;
 mod vfio;
 mod vfio_user;
 
-use std::fmt::{self, Display};
+use std::fmt::{self, Debug, Display};
 use std::num::ParseIntError;
 use std::str::FromStr;
 
@@ -152,6 +152,19 @@ impl From<&PciBdf> for u16 {
     }
 }
 
+impl Debug for PciBdf {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "{:04x}:{:02x}:{:02x}.{:01x}",
+            self.segment(),
+            self.bus(),
+            self.device(),
+            self.function()
+        )
+    }
+}
+
 impl Display for PciBdf {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(