linux-kernel - Re: [PATCH] optee: support wq_sleep

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Message-ID: <CAHUa44EcGnOno8TQ-wPE8Q_ghG8t5J5uRLqnYduAnQXx6oRATg@mail.gmail.com>
Date: Thu, 25 Jan 2024 16:02:08 +0100
From: Jens Wiklander <jens.wiklander@...aro.org>
To: "gavin.liu" <gavin.liu@...iatek.com>
Cc: Sumit Garg <sumit.garg@...aro.org>, Matthias Brugger <matthias.bgg@...il.com>, 
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>, op-tee@...ts.trustedfirmware.org, 
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
	linux-mediatek@...ts.infradead.org, 
	Project_Global_Chrome_Upstream_Group@...iatek.com, 
	Jerome Forissier <jerome.forissier@...aro.org>
Subject: Re: [PATCH] optee: support wq_sleep_timeout

On Thu, Jan 25, 2024 at 6:28 AM gavin.liu <gavin.liu@...iatek.com> wrote:
>
> From: Gavin Liu <gavin.liu@...iatek.com>
>
> Add wq_sleep_timeout to support self waking when timeout for secure
> driver usage.
>
> Signed-off-by: Gavin Liu <gavin.liu@...iatek.com>
> ---
>  drivers/tee/optee/notif.c         |  9 +++++++--
>  drivers/tee/optee/optee_private.h |  2 +-
>  drivers/tee/optee/rpc.c           | 10 ++++++++--
>  3 files changed, 16 insertions(+), 5 deletions(-)

I'd like to see the corresponding secure world changes taking
advantage of this ABI change before we take this any further.

Thanks,
Jens

>
> diff --git a/drivers/tee/optee/notif.c b/drivers/tee/optee/notif.c
> index 05212842b0a5..d5e5c0645609 100644
> --- a/drivers/tee/optee/notif.c
> +++ b/drivers/tee/optee/notif.c
> @@ -29,7 +29,7 @@ static bool have_key(struct optee *optee, u_int key)
>         return false;
>  }
>
> -int optee_notif_wait(struct optee *optee, u_int key)
> +int optee_notif_wait(struct optee *optee, u_int key, u32 timeout)
>  {
>         unsigned long flags;
>         struct notif_entry *entry;
> @@ -70,7 +70,12 @@ int optee_notif_wait(struct optee *optee, u_int key)
>          * Unlock temporarily and wait for completion.
>          */
>         spin_unlock_irqrestore(&optee->notif.lock, flags);
> -       wait_for_completion(&entry->c);
> +       if (timeout != 0) {
> +               if (!wait_for_completion_timeout(&entry->c, timeout))
> +                       rc = -ETIMEDOUT;
> +       } else {
> +               wait_for_completion(&entry->c);
> +       }
>         spin_lock_irqsave(&optee->notif.lock, flags);
>
>         list_del(&entry->link);
> diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
> index 7a5243c78b55..da990c4016ec 100644
> --- a/drivers/tee/optee/optee_private.h
> +++ b/drivers/tee/optee/optee_private.h
> @@ -252,7 +252,7 @@ struct optee_call_ctx {
>
>  int optee_notif_init(struct optee *optee, u_int max_key);
>  void optee_notif_uninit(struct optee *optee);
> -int optee_notif_wait(struct optee *optee, u_int key);
> +int optee_notif_wait(struct optee *optee, u_int key, u32 timeout);
>  int optee_notif_send(struct optee *optee, u_int key);
>
>  u32 optee_supp_thrd_req(struct tee_context *ctx, u32 func, size_t num_params,
> diff --git a/drivers/tee/optee/rpc.c b/drivers/tee/optee/rpc.c
> index e69bc6380683..14e6246aaf05 100644
> --- a/drivers/tee/optee/rpc.c
> +++ b/drivers/tee/optee/rpc.c
> @@ -130,6 +130,8 @@ static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
>  static void handle_rpc_func_cmd_wq(struct optee *optee,
>                                    struct optee_msg_arg *arg)
>  {
> +       int rc = 0;
> +
>         if (arg->num_params != 1)
>                 goto bad;
>
> @@ -139,7 +141,8 @@ static void handle_rpc_func_cmd_wq(struct optee *optee,
>
>         switch (arg->params[0].u.value.a) {
>         case OPTEE_RPC_NOTIFICATION_WAIT:
> -               if (optee_notif_wait(optee, arg->params[0].u.value.b))
> +               rc = optee_notif_wait(optee, arg->params[0].u.value.b, arg->params[0].u.value.c);
> +               if (rc)
>                         goto bad;
>                 break;
>         case OPTEE_RPC_NOTIFICATION_SEND:
> @@ -153,7 +156,10 @@ static void handle_rpc_func_cmd_wq(struct optee *optee,
>         arg->ret = TEEC_SUCCESS;
>         return;
>  bad:
> -       arg->ret = TEEC_ERROR_BAD_PARAMETERS;
> +       if (rc == -ETIMEDOUT)
> +               arg->ret = TEEC_ERROR_BUSY;
> +       else
> +               arg->ret = TEEC_ERROR_BAD_PARAMETERS;
>  }
>
>  static void handle_rpc_func_cmd_wait(struct optee_msg_arg *arg)
> --
> 2.18.0
>