chore: Update isIntegratedGPU for readability

Signed-off-by: Evan Lezar <elezar@nvidia.com>

Author: elezar

pkg/nvcdi/lib-csv.go

@@ -373,7 +373,12 @@ func isOrinGPUID(id device.Identifier) bool {
 }
 
 // isIntegratedGPU checks whether the specified device is an integrated GPU.
-// As a proxy we check the PCI Bus if for thes
+// The following heuristic is followed:
+//   - If the device does not support getting PCI bus information, we fall back to
+//     checking the device name and consider Orin and Thor devices iGPUs.
+//   - If the device does support PCI bus information, we check for a specific
+//     bus ID that is associated with Thor devices.
+//
 // TODO: This should be replaced by an explicit NVML call once available.
 func isIntegratedGPU(d nvml.Device) (bool, error) {
 	pciInfo, ret := d.GetPciInfo()
@@ -387,7 +392,11 @@ func isIntegratedGPU(d nvml.Device) (bool, error) {
 	if ret != nvml.SUCCESS {
 		return false, fmt.Errorf("failed to get PCI info: %v", ret)
 	}
-
+	// On Thor-based systems, the iGPU always has the PCI bus ID '0000:01:00.0'.
+	// We explicitly handle this case.
+	if pciInfo.Domain == 0 && pciInfo.Bus == 1 && pciInfo.Device == 0 {
+		return true, nil
+	}
 	if pciInfo.Domain != 0 {
 		return false, nil
 	}