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Message-ID: <CAFA6WYOJ6At7p21UuWNp8k4=Qwcb_2VFuV78Z9hksyW76p-fKA@mail.gmail.com>
Date: Wed, 28 Jul 2021 14:15:47 +0530
From: Sumit Garg <sumit.garg@...aro.org>
To: Jens Wiklander <jens.wiklander@...aro.org>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
OP-TEE TrustedFirmware <op-tee@...ts.trustedfirmware.org>,
Sudeep Holla <sudeep.holla@....com>,
Marc Bonnici <marc.bonnici@....com>,
Jerome Forissier <jerome@...issier.org>,
Sughosh Ganu <sughosh.ganu@...aro.org>
Subject: Re: [PATCH v3 2/5] optee: simplify optee_release()
On Thu, 22 Jul 2021 at 17:48, Jens Wiklander <jens.wiklander@...aro.org> wrote:
>
> Simplifies optee_release() with a new helper function,
> optee_close_session_helper() which has been factored out from
> optee_close_session().
>
Simplification looks good to me.
> A separate optee_release_supp() is added for the supplicant device.
>
On similar terms, can we have separate optee_open_supp() for better
understanding?
-Sumit
> Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
> ---
> drivers/tee/optee/call.c | 31 ++++++++++-------
> drivers/tee/optee/core.c | 55 +++++++++++--------------------
> drivers/tee/optee/optee_private.h | 1 +
> 3 files changed, 39 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
> index 6e6eb836e9b6..9d8f5a95e42f 100644
> --- a/drivers/tee/optee/call.c
> +++ b/drivers/tee/optee/call.c
> @@ -288,12 +288,28 @@ int optee_open_session(struct tee_context *ctx,
> return rc;
> }
>
> -int optee_close_session(struct tee_context *ctx, u32 session)
> +int optee_close_session_helper(struct tee_context *ctx, u32 session)
> {
> - struct optee_context_data *ctxdata = ctx->data;
> struct tee_shm *shm;
> struct optee_msg_arg *msg_arg;
> phys_addr_t msg_parg;
> +
> + shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg);
> + if (IS_ERR(shm))
> + return PTR_ERR(shm);
> +
> + msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
> + msg_arg->session = session;
> + optee_do_call_with_arg(ctx, msg_parg);
> +
> + tee_shm_free(shm);
> +
> + return 0;
> +}
> +
> +int optee_close_session(struct tee_context *ctx, u32 session)
> +{
> + struct optee_context_data *ctxdata = ctx->data;
> struct optee_session *sess;
>
> /* Check that the session is valid and remove it from the list */
> @@ -306,16 +322,7 @@ int optee_close_session(struct tee_context *ctx, u32 session)
> return -EINVAL;
> kfree(sess);
>
> - shm = get_msg_arg(ctx, 0, &msg_arg, &msg_parg);
> - if (IS_ERR(shm))
> - return PTR_ERR(shm);
> -
> - msg_arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
> - msg_arg->session = session;
> - optee_do_call_with_arg(ctx, msg_parg);
> -
> - tee_shm_free(shm);
> - return 0;
> + return optee_close_session_helper(ctx, session);
> }
>
> int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
> diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> index ddb8f9ecf307..949223b214c3 100644
> --- a/drivers/tee/optee/core.c
> +++ b/drivers/tee/optee/core.c
> @@ -263,59 +263,42 @@ static int optee_open(struct tee_context *ctx)
> return 0;
> }
>
> -static void optee_release(struct tee_context *ctx)
> +static void optee_release_helper(struct tee_context *ctx,
> + int (*close_session)(struct tee_context *ctx,
> + u32 session))
> {
> struct optee_context_data *ctxdata = ctx->data;
> - struct tee_device *teedev = ctx->teedev;
> - struct optee *optee = tee_get_drvdata(teedev);
> - struct tee_shm *shm;
> - struct optee_msg_arg *arg = NULL;
> - phys_addr_t parg;
> struct optee_session *sess;
> struct optee_session *sess_tmp;
>
> if (!ctxdata)
> return;
>
> - shm = tee_shm_alloc(ctx, sizeof(struct optee_msg_arg), TEE_SHM_MAPPED);
> - if (!IS_ERR(shm)) {
> - arg = tee_shm_get_va(shm, 0);
> - /*
> - * If va2pa fails for some reason, we can't call into
> - * secure world, only free the memory. Secure OS will leak
> - * sessions and finally refuse more sessions, but we will
> - * at least let normal world reclaim its memory.
> - */
> - if (!IS_ERR(arg))
> - if (tee_shm_va2pa(shm, arg, &parg))
> - arg = NULL; /* prevent usage of parg below */
> - }
> -
> list_for_each_entry_safe(sess, sess_tmp, &ctxdata->sess_list,
> list_node) {
> list_del(&sess->list_node);
> - if (!IS_ERR_OR_NULL(arg)) {
> - memset(arg, 0, sizeof(*arg));
> - arg->cmd = OPTEE_MSG_CMD_CLOSE_SESSION;
> - arg->session = sess->session_id;
> - optee_do_call_with_arg(ctx, parg);
> - }
> + close_session(ctx, sess->session_id);
> kfree(sess);
> }
> kfree(ctxdata);
> + ctx->data = NULL;
> +}
>
> - if (!IS_ERR(shm))
> - tee_shm_free(shm);
> +static void optee_release(struct tee_context *ctx)
> +{
> + optee_release_helper(ctx, optee_close_session_helper);
> +}
>
> - ctx->data = NULL;
> +static void optee_release_supp(struct tee_context *ctx)
> +{
> + struct optee *optee = tee_get_drvdata(ctx->teedev);
>
> - if (teedev == optee->supp_teedev) {
> - if (optee->scan_bus_wq) {
> - destroy_workqueue(optee->scan_bus_wq);
> - optee->scan_bus_wq = NULL;
> - }
> - optee_supp_release(&optee->supp);
> + optee_release_helper(ctx, optee_close_session_helper);
> + if (optee->scan_bus_wq) {
> + destroy_workqueue(optee->scan_bus_wq);
> + optee->scan_bus_wq = NULL;
> }
> + optee_supp_release(&optee->supp);
> }
>
> static const struct tee_driver_ops optee_ops = {
> @@ -339,7 +322,7 @@ static const struct tee_desc optee_desc = {
> static const struct tee_driver_ops optee_supp_ops = {
> .get_version = optee_get_version,
> .open = optee_open,
> - .release = optee_release,
> + .release = optee_release_supp,
> .supp_recv = optee_supp_recv,
> .supp_send = optee_supp_send,
> .shm_register = optee_shm_register_supp,
> diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
> index e25b216a14ef..2b63b796645e 100644
> --- a/drivers/tee/optee/optee_private.h
> +++ b/drivers/tee/optee/optee_private.h
> @@ -152,6 +152,7 @@ u32 optee_do_call_with_arg(struct tee_context *ctx, phys_addr_t parg);
> 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(struct tee_context *ctx, u32 session);
> int optee_invoke_func(struct tee_context *ctx, struct tee_ioctl_invoke_arg *arg,
> struct tee_param *param);
> --
> 2.31.1
>
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