[PATCH 2/2] gpu: nova-core: reject binding to SR-IOV Virtual Functions

[John Hubbard]

Nova-core must only bind to Physical Functions (PFs) and regular PCI
devices, not to Virtual Functions (VFs) created through SR-IOV.

Detect VFs using the newly added is_virtfn() method, and leave them
unclaimed. This allows a VFIO kernel module to claim the VFs instead.

Signed-off-by: John Hubbard <jhubbard@xxxxxxxxxx>
---
 drivers/gpu/nova-core/driver.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/nova-core/driver.rs b/drivers/gpu/nova-core/driver.rs
index 5d23a91f51dd..004c15763694 100644
--- a/drivers/gpu/nova-core/driver.rs
+++ b/drivers/gpu/nova-core/driver.rs
@@ -54,6 +54,11 @@ impl pci::Driver for NovaCore {
     fn probe(pdev: &pci::Device<Core>, _info: &Self::IdInfo) -> Result<Pin<KBox<Self>>> {
         dev_dbg!(pdev.as_ref(), "Probe Nova Core GPU driver.\n");
 
+        // NovaCore must only bind to Physical Functions (PFs), not Virtual Functions (VFs)
+        if pdev.is_virtfn() {
+            return Err(ENODEV);
+        }
+
         pdev.enable_device_mem()?;
         pdev.set_master();
 
-- 
2.51.0