drm/vmwgfx: Allow checking for gl43 contexts

To make sure we're running on top of hardware that can support
GL4.3 we need to add a way of querying for those capabilities.
DRM_VMW_PARAM_GL43 allows userspace to check for presence of
GL4.3 capable contexts.

Signed-off-by: Zack Rusin <[e-mail]>
Reviewed-by: Charmaine Lee <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/vmwgfx/vmwgfx_ioctl.c

···
 	case DRM_VMW_PARAM_SM5:
 		param->value = has_sm5_context(dev_priv);
 		break;
+	case DRM_VMW_PARAM_GL43:
+		param->value = has_gl43_context(dev_priv);
+		break;
 	default:
 		return -EINVAL;
 	}

include/uapi/drm/vmwgfx_drm.h

···
 #define DRM_VMW_PARAM_HW_CAPS2         13
 #define DRM_VMW_PARAM_SM4_1            14
 #define DRM_VMW_PARAM_SM5              15
+#define DRM_VMW_PARAM_GL43             16
 
 /**
  * enum drm_vmw_handle_type - handle type for ref ioctls