[PATCH 02/10] drm/xe: Define Virtual Function Identifier

[Michal Wajdeczko]

According to the PCI Express specification, the SR-IOV Virtual
Functions (VFs) are numbered starting with 1 (VF1, VF2, ...).
Additionally, both driver and GuC will refer to Physical Function
(PF) as VF0. Define helper macro to represent VFn and PF.

Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
---
 drivers/gpu/drm/xe/xe_sriov_types.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_sriov_types.h b/drivers/gpu/drm/xe/xe_sriov_types.h
index 999a4311b98b..fbeebdb12166 100644
--- a/drivers/gpu/drm/xe/xe_sriov_types.h
+++ b/drivers/gpu/drm/xe/xe_sriov_types.h
@@ -8,6 +8,18 @@
 
 #include <linux/build_bug.h>
 
+/**
+ * VFID - Virtual Function Identifier
+ * @n: VF number
+ *
+ * Helper macro to represent Virtual Function (VF) Indentifier.
+ * VFID(0) is used as alias to the PFID that represents Physical Function.
+ *
+ * Note: According to PCI spec, SR-IOV VF's numbers are 1-based (VF1, VF2, ...).
+ */
+#define VFID(n)		(n)
+#define PFID		VFID(0)
+
 /**
  * enum xe_sriov_mode - SR-IOV mode
  * @XE_SRIOV_MODE_NONE: bare-metal mode (non-virtualized)
-- 
2.25.1