drm/xe: Extend uAPI to query HuC micro-controler firmware version

The infrastructure to query GuC firmware version is already in place. It
is extended with a new micro-controller type to query the HuC firmware
version. It can be used from user space to know if HuC is running.

Cc: John Harrison <John.C.Harrison@Intel.com>
Cc: Francois Dugast <francois.dugast@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Francois Dugast <francois.dugast@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240208183539.185095-2-jose.souza@intel.com

drivers/gpu/drm/xe/xe_query.c

@@ -540,14 +540,44 @@ query_uc_fw_version(struct xe_device *xe, struct drm_xe_device_query *query)
 		version = &guc->fw.versions.found[XE_UC_FW_VER_COMPATIBILITY];
 		break;
 	}
+	case XE_QUERY_UC_TYPE_HUC: {
+		struct xe_gt *media_gt = NULL;
+		struct xe_huc *huc;
+
+		if (MEDIA_VER(xe) >= 13) {
+			struct xe_tile *tile;
+			u8 gt_id;
+
+			for_each_tile(tile, xe, gt_id) {
+				if (tile->media_gt) {
+					media_gt = tile->media_gt;
+					break;
+				}
+			}
+		} else {
+			media_gt = xe->tiles[0].primary_gt;
+		}
+
+		if (!media_gt)
+			break;
+
+		huc = &media_gt->uc.huc;
+		if (huc->fw.status == XE_UC_FIRMWARE_RUNNING)
+			version = &huc->fw.versions.found[XE_UC_FW_VER_RELEASE];
+		break;
+	}
 	default:
 		return -EINVAL;
 	}
 
-	resp.branch_ver = 0;
-	resp.major_ver = version->major;
-	resp.minor_ver = version->minor;
-	resp.patch_ver = version->patch;
+	if (version) {
+		resp.branch_ver = 0;
+		resp.major_ver = version->major;
+		resp.minor_ver = version->minor;
+		resp.patch_ver = version->patch;
+	} else {
+		return -ENODEV;
+	}
 
 	if (copy_to_user(query_ptr, &resp, size))
 		return -EFAULT;

include/uapi/drm/xe_drm.h

@@ -583,6 +583,7 @@ struct drm_xe_query_engine_cycles {
 struct drm_xe_query_uc_fw_version {
 	/** @uc_type: The micro-controller type to query firmware version */
 #define XE_QUERY_UC_TYPE_GUC_SUBMISSION 0
+#define XE_QUERY_UC_TYPE_HUC 1
 	__u16 uc_type;
 
 	/** @pad: MBZ */