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Date: Fri, 3 Feb 2023 12:27:28 +0100
From: Jens Wiklander <jens.wiklander@...aro.org>
To: Etienne Carriere <etienne.carriere@...aro.org>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
Sumit Garg <sumit.garg@...aro.org>,
Sudeep Holla <sudeep.holla@....com>,
Cristian Marussi <cristian.marussi@....com>
Subject: Re: [PATCH 1/2] tee: system invocation
On Mon, Jan 30, 2023 at 10:42 AM Etienne Carriere
<etienne.carriere@...aro.org> wrote:
>
> Adds TEE context flag sys_service to be enabled for invocation contexts
> that should used TEE provisioned system resources. OP-TEE SMC ABI entry
> rely this information to use a dedicated entry function to request
> allocation of a system thread from a dedicated system context pool.
>
> This feature is needed when a TEE invocation cannot afford to wait for
> a free TEE thread when all TEE threads context are used and suspended
> as these may be suspended waiting for a system service, as an SCMI clock
> or voltage regulator, to be enabled. An example is when OP-TEE invokes
> a Linux OS remove service (RPC) to access an eMMC RPMB partition and
> the eMMC device is supplied by an OP-TEE SCMI regulator.
>
> Signed-off-by: Etienne Carriere <etienne.carriere@...aro.org>
> ---
> drivers/tee/optee/optee_smc.h | 14 +++++++++++---
> drivers/tee/optee/smc_abi.c | 6 +++++-
> include/linux/tee_drv.h | 4 ++++
> 3 files changed, 20 insertions(+), 4 deletions(-)
Looks good to me.
Thanks,
Jens
>
> diff --git a/drivers/tee/optee/optee_smc.h b/drivers/tee/optee/optee_smc.h
> index 73b5e7760d10..7c7eedf183c5 100644
> --- a/drivers/tee/optee/optee_smc.h
> +++ b/drivers/tee/optee/optee_smc.h
> @@ -108,7 +108,8 @@ struct optee_smc_call_get_os_revision_result {
> * Call with struct optee_msg_arg as argument
> *
> * When called with OPTEE_SMC_CALL_WITH_RPC_ARG or
> - * OPTEE_SMC_CALL_WITH_REGD_ARG in a0 there is one RPC struct optee_msg_arg
> + * OPTEE_SMC_CALL_WITH_REGD_ARG or OPTEE_SMC_FUNCID_CALL_SYSTEM_WITH_REGD_ARG
> + * in a0 there is one RPC struct optee_msg_arg
> * following after the first struct optee_msg_arg. The RPC struct
> * optee_msg_arg has reserved space for the number of RPC parameters as
> * returned by OPTEE_SMC_EXCHANGE_CAPABILITIES.
> @@ -130,8 +131,8 @@ struct optee_smc_call_get_os_revision_result {
> * a4-6 Not used
> * a7 Hypervisor Client ID register
> *
> - * Call register usage, OPTEE_SMC_CALL_WITH_REGD_ARG:
> - * a0 SMC Function ID, OPTEE_SMC_CALL_WITH_REGD_ARG
> + * Call register usage, OPTEE_SMC_CALL_WITH_REGD_ARG and OPTEE_SMC_FUNCID_CALL_SYSTEM_WITH_REGD_ARG:
> + * a0 SMC Function ID, OPTEE_SMC_CALL_WITH_REGD_ARG or OPTEE_SMC_FUNCID_CALL_SYSTEM_WITH_REGD_ARG
> * a1 Upper 32 bits of a 64-bit shared memory cookie
> * a2 Lower 32 bits of a 64-bit shared memory cookie
> * a3 Offset of the struct optee_msg_arg in the shared memory with the
> @@ -175,6 +176,8 @@ struct optee_smc_call_get_os_revision_result {
> OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_WITH_RPC_ARG)
> #define OPTEE_SMC_CALL_WITH_REGD_ARG \
> OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_WITH_REGD_ARG)
> +#define OPTEE_SMC_CALL_SYSTEM_WITH_REGD_ARG \
> + OPTEE_SMC_STD_CALL_VAL(OPTEE_SMC_FUNCID_CALL_SYSTEM_WITH_REGD_ARG)
>
> /*
> * Get Shared Memory Config
> @@ -254,6 +257,8 @@ struct optee_smc_get_shm_config_result {
> #define OPTEE_SMC_SEC_CAP_ASYNC_NOTIF BIT(5)
> /* Secure world supports pre-allocating RPC arg struct */
> #define OPTEE_SMC_SEC_CAP_RPC_ARG BIT(6)
> +/* Secure world provisions thread for system service invocation */
> +#define OPTEE_SMC_SEC_CAP_SYSTEM_THREAD BIT(7)
>
> #define OPTEE_SMC_FUNCID_EXCHANGE_CAPABILITIES 9
> #define OPTEE_SMC_EXCHANGE_CAPABILITIES \
> @@ -426,6 +431,9 @@ struct optee_smc_disable_shm_cache_result {
> /* See OPTEE_SMC_CALL_WITH_REGD_ARG above */
> #define OPTEE_SMC_FUNCID_CALL_WITH_REGD_ARG 19
>
> +/* See OPTEE_SMC_CALL_SYSTEM_WITH_REGD_ARG above */
> +#define OPTEE_SMC_FUNCID_CALL_SYSTEM_WITH_REGD_ARG 20
> +
> /*
> * Resume from RPC (for example after processing a foreign interrupt)
> *
> diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c
> index a1c1fa1a9c28..513038a138f6 100644
> --- a/drivers/tee/optee/smc_abi.c
> +++ b/drivers/tee/optee/smc_abi.c
> @@ -889,7 +889,11 @@ static int optee_smc_do_call_with_arg(struct tee_context *ctx,
> }
>
> if (rpc_arg && tee_shm_is_dynamic(shm)) {
> - param.a0 = OPTEE_SMC_CALL_WITH_REGD_ARG;
> + if (ctx->sys_service &&
> + (optee->smc.sec_caps & OPTEE_SMC_SEC_CAP_SYSTEM_THREAD))
> + param.a0 = OPTEE_SMC_CALL_SYSTEM_WITH_REGD_ARG;
> + else
> + param.a0 = OPTEE_SMC_CALL_WITH_REGD_ARG;
> reg_pair_from_64(¶m.a1, ¶m.a2, (u_long)shm);
> param.a3 = offs;
> } else {
> diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
> index 17eb1c5205d3..1ff292ba7679 100644
> --- a/include/linux/tee_drv.h
> +++ b/include/linux/tee_drv.h
> @@ -47,6 +47,9 @@ struct tee_shm_pool;
> * non-blocking in nature.
> * @cap_memref_null: flag indicating if the TEE Client support shared
> * memory buffer with a NULL pointer.
> + * @sys_service: flag set by the TEE Client to indicate that it is part of
> + * a system service and that the TEE may use resources reserved
> + * for this.
> */
> struct tee_context {
> struct tee_device *teedev;
> @@ -55,6 +58,7 @@ struct tee_context {
> bool releasing;
> bool supp_nowait;
> bool cap_memref_null;
> + bool sys_service;
> };
>
> struct tee_param_memref {
> --
> 2.25.1
>
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