drm/xe: Stash GMD_ID value in xe_gt

Although we've stored the major and minor versions for graphics/media in
xe_device, it will be simpler to implement the uapi version query if we
also stash the raw register value in the GT itself.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240123204454.246788-4-jose.souza@intel.com
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>

drivers/gpu/drm/xe/xe_gt.c

@@ -399,6 +399,12 @@ static int gt_fw_domain_init(struct xe_gt *gt)
 	/* Initialize CCS mode sysfs after early initialization of HW engines */
 	xe_gt_ccs_mode_sysfs_init(gt);
 
+	/*
+	 * Stash hardware-reported version.  Since this register does not exist
+	 * on pre-MTL platforms, reading it there will (correctly) return 0.
+	 */
+	gt->info.gmdid = xe_mmio_read32(gt, GMD_ID);
+
 	err = xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
 	XE_WARN_ON(err);
 	xe_device_mem_access_put(gt_to_xe(gt));

drivers/gpu/drm/xe/xe_gt_types.h

@@ -117,6 +117,8 @@ struct xe_gt {
 		 * hwconfig blob.
 		 */
 		u64 __engine_mask;
+		/** @info.gmdid: raw GMD_ID value from hardware */
+		u32 gmdid;
 	} info;
 
 	/**