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[87.88.164.239]) by smtp.gmail.com with ESMTPSA id r18-20020a056000015200b003047d5b8817sm2521963wrx.80.2023.05.16.05.54.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 16 May 2023 05:54:11 -0700 (PDT) From: Etienne Carriere To: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, op-tee@lists.trustedfirmware.org, Sumit Garg , Jens Wiklander , Sudeep Holla , Cristian Marussi , Vincent Guittot , Etienne Carriere Subject: [PATCH v8 4/4] firmware: arm_scmi: optee: use optee system invocation Date: Tue, 16 May 2023 14:51:11 +0200 Message-Id: <20230516125111.2690204-5-etienne.carriere@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230516125111.2690204-1-etienne.carriere@linaro.org> References: <20230516125111.2690204-1-etienne.carriere@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" Changes SCMI optee transport to call tee_client_system_session() to request optee driver to provision an entry context in OP-TEE for processing OP-TEE messages. This prevents possible deadlock in case OP-TEE threads are all consumed while these may be waiting for a clock or regulator to be enable which SCMI OP-TEE service which requires a free thread context to execute. Acked-by: Sudeep Holla Signed-off-by: Etienne Carriere Reviewed-by: Sumit Garg --- No change since v7 No change since v6 Changes since v5: - Applied Sudeep's review tag Changes since v4: - Updated to new API function tee_client_system_session() introduced in patch v5 2/3. No change since v3 Changes since v2: - Fixed syntax issues (missing ';' chars), reported by kernel test robot. Changes since v1: - Updated to use new tee API functions tee_client_request_system_context() and tee_client_release_system_context(). --- drivers/firmware/arm_scmi/optee.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/firmware/arm_scmi/optee.c b/drivers/firmware/arm_scmi/= optee.c index e123de6e8c67..25bfb465484d 100644 --- a/drivers/firmware/arm_scmi/optee.c +++ b/drivers/firmware/arm_scmi/optee.c @@ -440,6 +440,10 @@ static int scmi_optee_chan_setup(struct scmi_chan_info= *cinfo, struct device *de if (ret) goto err_free_shm; =20 + ret =3D tee_client_system_session(scmi_optee_private->tee_ctx, channel->t= ee_session); + if (ret) + dev_warn(dev, "Could not switch to system session, do best effort\n"); + ret =3D get_channel(channel); if (ret) goto err_close_sess; --=20 2.25.1