drm/xe/vf: Treat GMDID as another runtime register

While the GMDID registers are not part of the runtime register list
shared by the PF driver, we may still return cached values from our
VF specific read32() helper function.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240523192240.844-7-michal.wajdeczko@intel.com

drivers/gpu/drm/xe/xe_gt_sriov_vf.c

@@ -13,6 +13,7 @@
 #include "abi/guc_communication_mmio_abi.h"
 #include "abi/guc_klvs_abi.h"
 #include "abi/guc_relay_actions_abi.h"
+#include "regs/xe_gt_regs.h"
 
 #include "xe_assert.h"
 #include "xe_device.h"
@@ -764,6 +765,12 @@ u32 xe_gt_sriov_vf_read32(struct xe_gt *gt, struct xe_reg reg)
 	xe_gt_assert(gt, gt->sriov.vf.pf_version.major);
 	xe_gt_assert(gt, !reg.vf);
 
+	if (reg.addr == GMD_ID.addr) {
+		xe_gt_sriov_dbg_verbose(gt, "gmdid(%#x) = %#x\n",
+					addr, gt->sriov.vf.runtime.gmdid);
+		return gt->sriov.vf.runtime.gmdid;
+	}
+
 	rr = vf_lookup_reg(gt, addr);
 	if (!rr) {
 		xe_gt_WARN(gt, IS_ENABLED(CONFIG_DRM_XE_DEBUG),