[PATCH v3 08/11] vfio: selftests: Add dev_dbg

Enable it with a #define DEBUG at the top of the file. Allows leaving
behind debugging prints that are useful in case future changes are
required.

Assisted-by: Claude:claude-opus-4.6
Reviewed-by: David Matlack <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
---
 .../vfio/lib/include/libvfio/vfio_pci_device.h        | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/testing/selftests/vfio/lib/include/libvfio/vfio_pci_device.h b/tools/testing/selftests/vfio/lib/include/libvfio/vfio_pci_device.h
index 3eabead717bbda..2a72b76c0e96bd 100644
--- a/tools/testing/selftests/vfio/lib/include/libvfio/vfio_pci_device.h
+++ b/tools/testing/selftests/vfio/lib/include/libvfio/vfio_pci_device.h
@@ -40,6 +40,17 @@ struct vfio_pci_device {
 
 struct vfio_pci_device *vfio_pci_device_alloc(const char *bdf, struct iommu *iommu);
 void vfio_pci_device_free(struct vfio_pci_device *device);
+
+#ifdef DEBUG
+#define dev_dbg dev_info
+#else
+#define dev_dbg(_dev, _fmt, ...)                             \
+	do {                                                 \
+		if (0)                                       \
+			dev_info(_dev, _fmt, ##__VA_ARGS__); \
+	} while (0)
+#endif
+
 struct vfio_pci_device *vfio_pci_device_init(const char *bdf, struct iommu *iommu);
 void vfio_pci_device_cleanup(struct vfio_pci_device *device);
 
-- 
2.43.0