Add tests exercising the PCI configuration space helpers.

Suggested-by: Danilo Krummrich <dakr@kernel.org>
Signed-off-by: Zhi Wang <zhiw@nvidia.com>
---
 samples/rust/rust_driver_pci.rs | 46 +++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/samples/rust/rust_driver_pci.rs b/samples/rust/rust_driver_pci.rs
index 528e672b6b89..6f0324b6bdf6 100644
--- a/samples/rust/rust_driver_pci.rs
+++ b/samples/rust/rust_driver_pci.rs
@@ -58,6 +58,50 @@ fn testdev(index: &TestIndex, bar: &Bar0) -> Result<u32> {
 
         Ok(bar.read32(Regs::COUNT))
     }
+
+    fn config_space(pdev: &pci::Device<Core>) -> Result {
+        let config = pdev.config_space()?;
+
+        // TODO: use the register!() macro for defining PCI configuration space registers once it
+        // has been move out of nova-core.
+        dev_info!(
+            pdev.as_ref(),
+            "pci-testdev config space read8 rev ID: {:x}\n",
+            config.read8(0x8)
+        );
+
+        dev_info!(
+            pdev.as_ref(),
+            "pci-testdev config space read16 vendor ID: {:x}\n",
+            config.read16(0)
+        );
+
+        dev_info!(
+            pdev.as_ref(),
+            "pci-testdev config space read32 BAR 0: {:x}\n",
+            config.read32(0x10)
+        );
+
+        dev_info!(
+            pdev.as_ref(),
+            "pci-testdev config space try_read8 rev ID: {:x}\n",
+            config.try_read8(0x8)?
+        );
+
+        dev_info!(
+            pdev.as_ref(),
+            "pci-testdev config space try_read16 vendor ID: {:x}\n",
+            config.try_read16(0)?
+        );
+
+        dev_info!(
+            pdev.as_ref(),
+            "pci-testdev config space try_read32 BAR 0: {:x}\n",
+            config.try_read32(0x10)?
+        );
+
+        Ok(())
+    }
 }
 
 impl pci::Driver for SampleDriver {
@@ -93,6 +137,8 @@ fn probe(pdev: &pci::Device<Core>, info: &Self::IdInfo) -> Result<Pin<KBox<Self>
             Self::testdev(info, bar)?
         );
 
+        Self::config_space(pdev)?;
+
         Ok(drvdata)
     }
 
-- 
2.51.0