From:   Etienne Carriere <etienne.carriere@linaro.org>
To:     linux-kernel@vger.kernel.org
Cc:     linux-arm-kernel@lists.infradead.org,
        Jens Wiklander <jens.wiklander@linaro.org>,
        Sumit Garg <sumit.garg@linaro.org>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Cristian Marussi <cristian.marussi@arm.com>,
        Etienne Carriere <etienne.carriere@linaro.org>
Subject: [PATCH 2/2] firmware: arm_scmi: optee: use optee system invocation
Date:   Mon, 30 Jan 2023 10:41:57 +0100
Message-Id: <20230130094157.1082712-2-etienne.carriere@linaro.org>
In-Reply-To: <20230130094157.1082712-1-etienne.carriere@linaro.org>
References: <20230130094157.1082712-1-etienne.carriere@linaro.org>
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Changes SCMI optee transport to enable sys_service capability of
its tee context to leverage provisioned system resources in OP-TEE
preventing possible deadlock.

Such deadlock could happen when many Linux clients invoke OP-TEE are
are all suspended waiting for an OP-TEE RPC request access an SCMI
resource through the SCMI OP-TEE PTA service.

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
---
 drivers/firmware/arm_scmi/optee.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/firmware/arm_scmi/optee.c b/drivers/firmware/arm_scmi/optee.c
index 2a7aeab40e54..91840345e946 100644
--- a/drivers/firmware/arm_scmi/optee.c
+++ b/drivers/firmware/arm_scmi/optee.c
@@ -559,6 +559,9 @@ static int scmi_optee_service_probe(struct device *dev)
 	if (IS_ERR(tee_ctx))
 		return -ENODEV;
 
+	/* SCMI agent can used TEE system service resources */
+	tee_ctx->sys_service = true;
+
 	agent = devm_kzalloc(dev, sizeof(*agent), GFP_KERNEL);
 	if (!agent) {
 		ret = -ENOMEM;
-- 
2.25.1