linux-kernel - Re: [PATCH 1/1] tee: add cancellation support to client interface

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Date:   Thu, 24 Jan 2019 17:19:31 +0100
From:   Jens Wiklander <jens.wiklander@...aro.org>
To:     Igor Opaniuk <igor.opaniuk@...aro.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        tee-dev@...ts.linaro.org,
        Jerome Forissier <jerome.forissier@...aro.org>,
        "Zengtao (B)" <prime.zeng@...ilicon.com>,
        Sumit Garg <sumit.garg@...aro.org>
Subject: Re: [PATCH 1/1] tee: add cancellation support to client interface

On Thu, Jan 24, 2019 at 2:11 PM Igor Opaniuk <igor.opaniuk@...aro.org> wrote:
>
> Add support of cancellation request to the TEE kernel internal
> client interface. Can be used by software TPM drivers, that leverage
> TEE under the hood (for instance in TPM2.0 mobile profile), for requesting
> cancellation of time-consuming operations (RSA key-pair generation etc.).
>
> Signed-off-by: Igor Opaniuk <igor.opaniuk@...aro.org>
> ---
>  drivers/tee/tee_core.c  | 12 ++++++++++++
>  include/linux/tee_drv.h | 14 ++++++++++++++
>  2 files changed, 26 insertions(+)
>
> diff --git a/drivers/tee/tee_core.c b/drivers/tee/tee_core.c
> index 7b2bb4c..aba71a8 100644
> --- a/drivers/tee/tee_core.c
> +++ b/drivers/tee/tee_core.c
> @@ -1027,6 +1027,18 @@ int tee_client_invoke_func(struct tee_context *ctx,
>  }
>  EXPORT_SYMBOL_GPL(tee_client_invoke_func);
>
> +int tee_client_cancel_req(struct tee_context *ctx,
> +                         u32 cancel_id,
> +                         u32 session)
> +{
> +
> +       if (!ctx->teedev->desc->ops->cancel_req)
> +               return -EINVAL;
> +       return ctx->teedev->desc->ops->cancel_req(ctx, cancel_id,
> +                                                 session);
> +}
> +EXPORT_SYMBOL_GPL(tee_client_cancel_req);
> +
>  static int __init tee_init(void)
>  {
>         int rc;
> diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
> index 6cfe058..62a0b56 100644
> --- a/include/linux/tee_drv.h
> +++ b/include/linux/tee_drv.h
> @@ -526,6 +526,20 @@ int tee_client_invoke_func(struct tee_context *ctx,
>                            struct tee_ioctl_invoke_arg *arg,
>                            struct tee_param *param);
>
> +/**
> + * tee_client_cancel_req() - Request cancellation of the previous open-session
> + * or invoke-command operations in a Trusted Application
> + * @ctx:       TEE Context
> + * @arg:       Unique cancel request id
> + * @param:     Session id

These need to be updated, see struct tee_ioctl_cancel_arg in
include/uapi/linux/tee.h

Thanks,
Jens

> + *
> + * Returns < 0 on error else see @arg->ret for result.
> + */
> +int tee_client_cancel_req(struct tee_context *ctx,
> +                         u32 cancel_id,
> +                         u32 session);
> +
> +
>  static inline bool tee_param_is_memref(struct tee_param *param)
>  {
>         switch (param->attr & TEE_IOCTL_PARAM_ATTR_TYPE_MASK) {
> --
> 2.7.4
>