tftf: spci: probe if SPMC is OP-TEE at S-EL1
For pre-Armv8.4 platform, the supported model is that SPMC runs at
S-EL1. The candidate is OP-TEE with SPCI protocol adaptation. This patch
performs a version check through direct messaging and determines if
OP-TEE runs as SPMC by checking version responses. If this does not
match, then it assumes SPMC runs at S-EL2 with two Cactus instances
running at S-EL1.
Signed-off-by: Olivier Deprez <olivier.deprez@arm.com>
Change-Id: I34194b6e8b3d447a25f2153bbac1be2631cd7a5e
diff --git a/tftf/tests/runtime_services/secure_service/test_spci_direct_messaging.c b/tftf/tests/runtime_services/secure_service/test_spci_direct_messaging.c
index 7c0e973..e085226 100644
--- a/tftf/tests/runtime_services/secure_service/test_spci_direct_messaging.c
+++ b/tftf/tests/runtime_services/secure_service/test_spci_direct_messaging.c
@@ -22,6 +22,11 @@
#define DIRECT_MSG_TEST_PATTERN2 (0xbbbb0000)
#define DIRECT_MSG_TEST_PATTERN3 (0xcccc0000)
+#define OPTEE_SPCI_GET_API_VERSION (0)
+#define OPTEE_SPCI_GET_OS_VERSION (1)
+#define OPTEE_SPCI_GET_OS_VERSION_MAJOR (3)
+#define OPTEE_SPCI_GET_OS_VERSION_MINOR (8)
+
static test_result_t send_receive_direct_msg(unsigned int sp_id,
unsigned int test_pattern)
{
@@ -52,6 +57,49 @@
return TEST_RESULT_SUCCESS;
}
+/*
+ * check_spmc_execution_level
+ *
+ * Attempt sending impdef protocol messages to OP-TEE through direct messaging.
+ * Criteria for detecting OP-TEE presence is that responses match defined
+ * version values. In the case of SPMC running at S-EL2 (and Cactus instances
+ * running at S-EL1) the response will not match the pre-defined version IDs.
+ *
+ * Returns true if SPMC is probed as being OP-TEE at S-EL1.
+ *
+ */
+static bool check_spmc_execution_level(void)
+{
+ unsigned int is_optee_spmc_criteria = 0;
+ smc_ret_values ret_values;
+
+ /*
+ * Send a first OP-TEE-defined protocol message through
+ * SPCI direct message.
+ *
+ */
+ ret_values = spci_msg_send_direct_req(HYP_ID, SP_ID(1),
+ OPTEE_SPCI_GET_API_VERSION);
+ if ((ret_values.ret3 == SPCI_VERSION_MAJOR) &&
+ (ret_values.ret4 == SPCI_VERSION_MINOR)) {
+ is_optee_spmc_criteria++;
+ }
+
+ /*
+ * Send a second OP-TEE-defined protocol message through
+ * SPCI direct message.
+ *
+ */
+ ret_values = spci_msg_send_direct_req(HYP_ID, SP_ID(1),
+ OPTEE_SPCI_GET_OS_VERSION);
+ if ((ret_values.ret3 == OPTEE_SPCI_GET_OS_VERSION_MAJOR) &&
+ (ret_values.ret4 == OPTEE_SPCI_GET_OS_VERSION_MINOR)) {
+ is_optee_spmc_criteria++;
+ }
+
+ return (is_optee_spmc_criteria == 2);
+}
+
test_result_t test_spci_direct_messaging(void)
{
smc_ret_values ret_values;
@@ -62,6 +110,18 @@
**********************************************************************/
SKIP_TEST_IF_SPCI_VERSION_LESS_THAN(0, 9);
+ /* Check if SPMC is OP-TEE at S-EL1 */
+ if (check_spmc_execution_level()) {
+ /* Direct messaging is successfully verified for OP-TEE */
+ return TEST_RESULT_SUCCESS;
+ }
+
+ /*
+ * From this point assume SPMC runs at S-EL2 and two Cactus instances
+ * are loaded at S-EL1.
+ *
+ */
+
/**********************************************************************
* Send a message to SP1 through direct messaging
**********************************************************************/