guc_to_drm
struct drm_device *drm = guc_to_drm(guc);
guc->capture = drmm_kzalloc(guc_to_drm(guc), sizeof(*guc->capture), GFP_KERNEL);
caplist = drmm_kzalloc(guc_to_drm(guc), size, GFP_KERNEL);
null_header = drmm_kzalloc(guc_to_drm(guc), tmp, GFP_KERNEL);