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| author | Etienne Carriere <etienne.carriere@foss.st.com> | 2023-10-30 09:48:10 +0100 |
|---|---|---|
| committer | Jens Wiklander <jens.wiklander@linaro.org> | 2023-11-17 15:48:03 +0100 |
| commit | a9214a8883ceb82df55aa90d1c49ddb85fc1e3d5 (patch) | |
| tree | 9ab8c6ba9404ef07f2e82b89216e198fafea8a9f /drivers/tee | |
| parent | tee: optee: system thread call property (diff) | |
| download | linux-a9214a8883ceb82df55aa90d1c49ddb85fc1e3d5.tar.xz linux-a9214a8883ceb82df55aa90d1c49ddb85fc1e3d5.zip | |
tee: system session
Adds kernel client API function tee_client_system_session() for a client
to request a system service entry in TEE context.
This feature is needed to prevent a system deadlock when several TEE
client applications invoke TEE, consuming all TEE thread contexts
available in the secure world. The deadlock can happen in the OP-TEE
driver for example if all these TEE threads issue an RPC call from TEE
to Linux OS to access an eMMC RPMB partition (TEE secure storage) which
device clock or regulator controller is accessed through an OP-TEE SCMI
services. In that case, Linux SCMI driver must reach OP-TEE SCMI service
without waiting until one of the consumed TEE threads is freed.
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Co-developed-by: Jens Wiklander <jens.wiklander@linaro.org>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'drivers/tee')
| -rw-r--r-- | drivers/tee/tee_core.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c index 5ddfd5d9ac7f..792d6fae4354 100644 --- a/drivers/tee/tee_core.c +++ b/drivers/tee/tee_core.c @@ -1173,6 +1173,14 @@ int tee_client_close_session(struct tee_context *ctx, u32 session) } EXPORT_SYMBOL_GPL(tee_client_close_session); +int tee_client_system_session(struct tee_context *ctx, u32 session) +{ + if (!ctx->teedev->desc->ops->system_session) + return -EINVAL; + return ctx->teedev->desc->ops->system_session(ctx, session); +} +EXPORT_SYMBOL_GPL(tee_client_system_session); + int tee_client_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg, struct tee_param *param) |