optee: add timeout value to optee_notif_wait() to support timeout

Add timeout value to support self waking when timeout to avoid waiting
indefinitely.
Signed-off-by: Gavin Liu <gavin.liu@mediatek.com>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

drivers/tee/optee/notif.c

@@ -29,7 +29,7 @@ static bool have_key(struct optee *optee, u_int key)
 	return false;
 }
 
-int optee_notif_wait(struct optee *optee, u_int key)
+int optee_notif_wait(struct optee *optee, u_int key, u32 timeout)
 {
 	unsigned long flags;
 	struct notif_entry *entry;
@@ -70,7 +70,12 @@ int optee_notif_wait(struct optee *optee, u_int key)
 	 * Unlock temporarily and wait for completion.
 	 */
 	spin_unlock_irqrestore(&optee->notif.lock, flags);
+	if (timeout != 0) {
+		if (!wait_for_completion_timeout(&entry->c, timeout))
+			rc = -ETIMEDOUT;
+	} else {
 		wait_for_completion(&entry->c);
+	}
 	spin_lock_irqsave(&optee->notif.lock, flags);
 
 	list_del(&entry->link);

drivers/tee/optee/optee_private.h

@@ -26,6 +26,9 @@
 #define TEEC_ERROR_BUSY			0xFFFF000D
 #define TEEC_ERROR_SHORT_BUFFER		0xFFFF0010
 
+/* API Return Codes are from the GP TEE Internal Core API Specification */
+#define TEE_ERROR_TIMEOUT		0xFFFF3001
+
 #define TEEC_ORIGIN_COMMS		0x00000002
 
 /*
@@ -252,7 +255,7 @@ struct optee_call_ctx {
 
 int optee_notif_init(struct optee *optee, u_int max_key);
 void optee_notif_uninit(struct optee *optee);
-int optee_notif_wait(struct optee *optee, u_int key);
+int optee_notif_wait(struct optee *optee, u_int key, u32 timeout);
 int optee_notif_send(struct optee *optee, u_int key);
 
 u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params,

drivers/tee/optee/optee_rpc_cmd.h

@@ -41,6 +41,7 @@
  * Waiting on notification
  * [in]    value[0].a	    OPTEE_RPC_NOTIFICATION_WAIT
  * [in]    value[0].b	    notification value
+ * [in]    value[0].c	    timeout in milliseconds or 0 if no timeout
  *
  * Sending a synchronous notification
  * [in]    value[0].a	    OPTEE_RPC_NOTIFICATION_SEND

drivers/tee/optee/rpc.c

@@ -130,6 +130,8 @@ static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
 static void handle_rpc_func_cmd_wq(struct optee *optee,
 				   struct optee_msg_arg *arg)
 {
+	int rc = 0;
+
 	if (arg->num_params != 1)
 		goto bad;
 
@@ -139,7 +141,8 @@ static void handle_rpc_func_cmd_wq(struct optee *optee,
 
 	switch (arg->params[0].u.value.a) {
 	case OPTEE_RPC_NOTIFICATION_WAIT:
-		if (optee_notif_wait(optee, arg->params[0].u.value.b))
+		rc = optee_notif_wait(optee, arg->params[0].u.value.b, arg->params[0].u.value.c);
+		if (rc)
 			goto bad;
 		break;
 	case OPTEE_RPC_NOTIFICATION_SEND:
@@ -153,6 +156,9 @@ static void handle_rpc_func_cmd_wq(struct optee *optee,
 	arg->ret = TEEC_SUCCESS;
 	return;
 bad:
+	if (rc == -ETIMEDOUT)
+		arg->ret = TEE_ERROR_TIMEOUT;
+	else
 		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
 }