tee: add TEE_IOCTL_PARAM_ATTR_META

Adds TEE_IOCTL_PARAM_ATTR_META which can be used to indicate meta
parameters when communicating with user space. These meta parameters can
be used by supplicant support multiple parallel requests at a time.

Reviewed-by: Etienne Carriere <etienne.carriere@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

include/uapi/linux/tee.h

@@ -154,6 +154,13 @@ struct tee_ioctl_buf_data {
  */
 #define TEE_IOCTL_PARAM_ATTR_TYPE_MASK		0xff
 
+/* Meta parameter carrying extra information about the message. */
+#define TEE_IOCTL_PARAM_ATTR_META		0x100
+
+/* Mask of all known attr bits */
+#define TEE_IOCTL_PARAM_ATTR_MASK \
+	(TEE_IOCTL_PARAM_ATTR_TYPE_MASK | TEE_IOCTL_PARAM_ATTR_META)
+
 /*
  * Matches TEEC_LOGIN_* in GP TEE Client API
  * Are only defined for GP compliant TEEs