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References: <20230505173012.881083-1-etienne.carriere@linaro.org>
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From:   Sumit Garg <sumit.garg@linaro.org>
Date:   Wed, 10 May 2023 13:52:35 +0530
Message-ID: <CAFA6WYMGw5Dh09BfZwmYtdWQOLGvft4DPuQt4mUByk55vQwjJg@mail.gmail.com>
Subject: Re: [PATCH v6 1/4] tee: optee: system call property
To:     Etienne Carriere <etienne.carriere@linaro.org>
Cc:     linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        op-tee@lists.trustedfirmware.org,
        Jens Wiklander <jens.wiklander@linaro.org>,
        Sudeep Holla <sudeep.holla@arm.com>,
        Cristian Marussi <cristian.marussi@arm.com>
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Precedence: bulk

Hi Etienne,

Apologies for the late re-review for this patchset. It has been quite
a busy last month for me.

As a side note, I would appreciate it if you add a cover letter to
your patchset. A cover letter is generally preferred if there is a
patchset containing 2 or more patches.

On Fri, 5 May 2023 at 23:01, Etienne Carriere
<etienne.carriere@linaro.org> wrote:
>
> Adds an argument to do_call_with_arg() handler to tell whether the call
> is a system call or nor. This change always sets this info to false
> hence no functional change.
>
> This change prepares management of system invocation proposed in a later
> change.
>
> Co-developed-by: Jens Wiklander <jens.wiklander@linaro.org>
> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
> Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
> ---
> No changes since v5
>
> Changes since v4:
> - New change, extracted from PATCH v4 1/2 (tee: system invocation") and
>   revised to cover preparatory changes in optee driver for system session
>   support with contribution from Jens.
> ---
>  drivers/tee/optee/call.c          | 22 ++++++++++++++++------
>  drivers/tee/optee/core.c          |  5 +++--
>  drivers/tee/optee/ffa_abi.c       |  3 ++-
>  drivers/tee/optee/optee_private.h |  7 +++++--
>  drivers/tee/optee/smc_abi.c       |  9 +++++----
>  5 files changed, 31 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
> index df5fb5410b72..dba5339b61ae 100644
> --- a/drivers/tee/optee/call.c
> +++ b/drivers/tee/optee/call.c
> @@ -328,7 +328,8 @@ int optee_open_session(struct tee_context *ctx,
>                 goto out;
>         }
>
> -       if (optee->ops->do_call_with_arg(ctx, shm, offs)) {
> +       if (optee->ops->do_call_with_arg(ctx, shm, offs,
> +                                        sess->use_sys_thread)) {
>                 msg_arg->ret = TEEC_ERROR_COMMUNICATION;
>                 msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
>         }
> @@ -360,7 +361,8 @@ int optee_open_session(struct tee_context *ctx,
>         return rc;
>  }
>
> -int optee_close_session_helper(struct tee_context *ctx, u32 session)
> +int optee_close_session_helper(struct tee_context *ctx, u32 session,
> +                              bool system_thread)
>  {
>         struct optee *optee = tee_get_drvdata(ctx->teedev);
>         struct optee_shm_arg_entry *entry;
> @@ -374,7 +376,7 @@ int optee_close_session_helper(struct tee_context *ctx, u32 session)
>
>         msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
>         msg_arg->session = session;
> -       optee->ops->do_call_with_arg(ctx, shm, offs);
> +       optee->ops->do_call_with_arg(ctx, shm, offs, system_thread);
>
>         optee_free_msg_arg(ctx, entry, offs);
>
> @@ -385,6 +387,7 @@ int optee_close_session(struct tee_context *ctx, u32 session)
>  {
>         struct optee_context_data *ctxdata = ctx->data;
>         struct optee_session *sess;
> +       bool system_thread;
>
>         /* Check that the session is valid and remove it from the list */
>         mutex_lock(&ctxdata->mutex);
> @@ -394,9 +397,10 @@ int optee_close_session(struct tee_context *ctx, u32 session)
>         mutex_unlock(&ctxdata->mutex);
>         if (!sess)
>                 return -EINVAL;
> +       system_thread = sess->use_sys_thread;
>         kfree(sess);
>
> -       return optee_close_session_helper(ctx, session);
> +       return optee_close_session_helper(ctx, session, system_thread);
>  }
>
>  int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
> @@ -408,12 +412,15 @@ int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
>         struct optee_msg_arg *msg_arg;
>         struct optee_session *sess;
>         struct tee_shm *shm;
> +       bool system_thread;
>         u_int offs;
>         int rc;
>
>         /* Check that the session is valid */
>         mutex_lock(&ctxdata->mutex);
>         sess = find_session(ctxdata, arg->session);
> +       if (sess)

This check is redundant if we move the assignment below...

> +               system_thread = sess->use_sys_thread;
>         mutex_unlock(&ctxdata->mutex);
>         if (!sess)
>                 return -EINVAL;

...here as:
           system_thread = sess->use_sys_thread;

> @@ -432,7 +439,7 @@ int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
>         if (rc)
>                 goto out;
>
> -       if (optee->ops->do_call_with_arg(ctx, shm, offs)) {
> +       if (optee->ops->do_call_with_arg(ctx, shm, offs, system_thread)) {
>                 msg_arg->ret = TEEC_ERROR_COMMUNICATION;
>                 msg_arg->ret_origin = TEEC_ORIGIN_COMMS;
>         }
> @@ -457,12 +464,15 @@ int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
>         struct optee_shm_arg_entry *entry;
>         struct optee_msg_arg *msg_arg;
>         struct optee_session *sess;
> +       bool system_thread;
>         struct tee_shm *shm;
>         u_int offs;
>
>         /* Check that the session is valid */
>         mutex_lock(&ctxdata->mutex);
>         sess = find_session(ctxdata, session);
> +       if (sess)

Ditto.

-Sumit

> +               system_thread = sess->use_sys_thread;
>         mutex_unlock(&ctxdata->mutex);
>         if (!sess)
>                 return -EINVAL;
> @@ -474,7 +484,7 @@ int optee_cancel_req(struct tee_context *ctx, u32 cancel_id, u32 session)
>         msg_arg->cmd = OPTEE_MSG_CMD_CANCEL;
>         msg_arg->session = session;
>         msg_arg->cancel_id = cancel_id;
> -       optee->ops->do_call_with_arg(ctx, shm, offs);
> +       optee->ops->do_call_with_arg(ctx, shm, offs, system_thread);
>
>         optee_free_msg_arg(ctx, entry, offs);
>         return 0;
> diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> index 2a258bd3b6b5..d01ca47f7bde 100644
> --- a/drivers/tee/optee/core.c
> +++ b/drivers/tee/optee/core.c
> @@ -129,7 +129,8 @@ int optee_open(struct tee_context *ctx, bool cap_memref_null)
>
>  static void optee_release_helper(struct tee_context *ctx,
>                                  int (*close_session)(struct tee_context *ctx,
> -                                                     u32 session))
> +                                                     u32 session,
> +                                                     bool system_thread))
>  {
>         struct optee_context_data *ctxdata = ctx->data;
>         struct optee_session *sess;
> @@ -141,7 +142,7 @@ static void optee_release_helper(struct tee_context *ctx,
>         list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
>                                  list_node) {
>                 list_del(&sess->list_node);
> -               close_session(ctx, sess->session_id);
> +               close_session(ctx, sess->session_id, sess->use_sys_thread);
>                 kfree(sess);
>         }
>         kfree(ctxdata);
> diff --git a/drivers/tee/optee/ffa_abi.c b/drivers/tee/optee/ffa_abi.c
> index 0828240f27e6..52cec9d06041 100644
> --- a/drivers/tee/optee/ffa_abi.c
> +++ b/drivers/tee/optee/ffa_abi.c
> @@ -612,7 +612,8 @@ static int optee_ffa_yielding_call(struct tee_context *ctx,
>   */
>
>  static int optee_ffa_do_call_with_arg(struct tee_context *ctx,
> -                                     struct tee_shm *shm, u_int offs)
> +                                     struct tee_shm *shm, u_int offs,
> +                                     bool system_thread)
>  {
>         struct ffa_send_direct_data data = {
>                 .data0 = OPTEE_FFA_YIELDING_CALL_WITH_ARG,
> diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
> index 72685ee0d53f..3da7960ab34a 100644
> --- a/drivers/tee/optee/optee_private.h
> +++ b/drivers/tee/optee/optee_private.h
> @@ -154,7 +154,8 @@ struct optee;
>   */
>  struct optee_ops {
>         int (*do_call_with_arg)(struct tee_context *ctx,
> -                               struct tee_shm *shm_arg, u_int offs);
> +                               struct tee_shm *shm_arg, u_int offs,
> +                               bool system_thread);
>         int (*to_msg_param)(struct optee *optee,
>                             struct optee_msg_param *msg_params,
>                             size_t num_params, const struct tee_param *params);
> @@ -204,6 +205,7 @@ struct optee {
>  struct optee_session {
>         struct list_head list_node;
>         u32 session_id;
> +       bool use_sys_thread;
>  };
>
>  struct optee_context_data {
> @@ -252,7 +254,8 @@ int optee_supp_send(struct tee_context *ctx, u32 ret, u32 num_params,
>  int optee_open_session(struct tee_context *ctx,
>                        struct tee_ioctl_open_session_arg *arg,
>                        struct tee_param *param);
> -int optee_close_session_helper(struct tee_context *ctx, u32 session);
> +int optee_close_session_helper(struct tee_context *ctx, u32 session,
> +                              bool system_thread);
>  int optee_close_session(struct tee_context *ctx, u32 session);
>  int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
>                       struct tee_param *param);
> diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c
> index 49702cb08f4f..56ebbb96ac97 100644
> --- a/drivers/tee/optee/smc_abi.c
> +++ b/drivers/tee/optee/smc_abi.c
> @@ -507,7 +507,7 @@ static int optee_shm_register(struct tee_context *ctx, struct tee_shm *shm,
>         msg_arg->params->u.tmem.buf_ptr = virt_to_phys(pages_list) |
>           (tee_shm_get_page_offset(shm) & (OPTEE_MSG_NONCONTIG_PAGE_SIZE - 1));
>
> -       if (optee->ops->do_call_with_arg(ctx, shm_arg, 0) ||
> +       if (optee->ops->do_call_with_arg(ctx, shm_arg, 0, false) ||
>             msg_arg->ret != TEEC_SUCCESS)
>                 rc = -EINVAL;
>
> @@ -550,7 +550,7 @@ static int optee_shm_unregister(struct tee_context *ctx, struct tee_shm *shm)
>         msg_arg->params[0].attr = OPTEE_MSG_ATTR_TYPE_RMEM_INPUT;
>         msg_arg->params[0].u.rmem.shm_ref = (unsigned long)shm;
>
> -       if (optee->ops->do_call_with_arg(ctx, shm_arg, 0) ||
> +       if (optee->ops->do_call_with_arg(ctx, shm_arg, 0, false) ||
>             msg_arg->ret != TEEC_SUCCESS)
>                 rc = -EINVAL;
>  out:
> @@ -885,7 +885,8 @@ static void optee_handle_rpc(struct tee_context *ctx,
>   * Returns return code from secure world, 0 is OK
>   */
>  static int optee_smc_do_call_with_arg(struct tee_context *ctx,
> -                                     struct tee_shm *shm, u_int offs)
> +                                     struct tee_shm *shm, u_int offs,
> +                                     bool system_thread)
>  {
>         struct optee *optee = tee_get_drvdata(ctx->teedev);
>         struct optee_call_waiter w;
> @@ -977,7 +978,7 @@ static int simple_call_with_arg(struct tee_context *ctx, u32 cmd)
>                 return PTR_ERR(msg_arg);
>
>         msg_arg->cmd = cmd;
> -       optee_smc_do_call_with_arg(ctx, shm, offs);
> +       optee_smc_do_call_with_arg(ctx, shm, offs, false);
>
>         optee_free_msg_arg(ctx, entry, offs);
>         return 0;
> --
> 2.25.1
>