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Message-ID: <CAFA6WYMwWFRUo719wHHsjaAUOSdo4cMa8gdHBMWidP4vC4z31g@mail.gmail.com>
Date: Thu, 18 May 2023 11:52:16 +0530
From: Sumit Garg <sumit.garg@...aro.org>
To: Etienne Carriere <etienne.carriere@...aro.org>
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
op-tee@...ts.trustedfirmware.org,
Jens Wiklander <jens.wiklander@...aro.org>,
Sudeep Holla <sudeep.holla@....com>,
Cristian Marussi <cristian.marussi@....com>,
Vincent Guittot <vincent.guittot@...aro.org>
Subject: Re: [PATCH v8 1/4] tee: optee: system call property
On Tue, 16 May 2023 at 18:24, Etienne Carriere
<etienne.carriere@...aro.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
s/nor/not/
> hence no functional change.
>
> This change prepares management of system invocation proposed in a later
> change.
>
> Co-developed-by: Jens Wiklander <jens.wiklander@...aro.org>
> Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
> Signed-off-by: Etienne Carriere <etienne.carriere@...aro.org>
> ---
> No change since v7
Reviewed-by: Sumit Garg <sumit.garg@...aro.org>
-Sumit
>
> Changes since v6:
> - Squashed a part of patch v6 3/4 changes into this patch v7 1/4
> related to adding boolean system thread attribute into optee
> driver call queue and SMC/FF-A ABIs API functions.
> - Removed local variable sys_thread set to constant false value
> and use false straight as function argument instead.
> - Comment on struct optee_session::use_sys_thread being read with
> optee mutex locked is not addressed as still under discussion.
>
> 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 | 24 +++++++++++++++++-------
> drivers/tee/optee/core.c | 5 +++--
> drivers/tee/optee/ffa_abi.c | 10 ++++++----
> drivers/tee/optee/optee_private.h | 9 ++++++---
> drivers/tee/optee/smc_abi.c | 15 ++++++++-------
> 5 files changed, 40 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/tee/optee/call.c b/drivers/tee/optee/call.c
> index df5fb5410b72..152ae9bb1785 100644
> --- a/drivers/tee/optee/call.c
> +++ b/drivers/tee/optee/call.c
> @@ -40,7 +40,7 @@ struct optee_shm_arg_entry {
> };
>
> void optee_cq_wait_init(struct optee_call_queue *cq,
> - struct optee_call_waiter *w)
> + struct optee_call_waiter *w, bool sys_thread)
> {
> /*
> * We're preparing to make a call to secure world. In case we can't
> @@ -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)
> + system_thread = sess->use_sys_thread;
> mutex_unlock(&ctxdata->mutex);
> if (!sess)
> return -EINVAL;
> @@ -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)
> + 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..5fde9d4100e3 100644
> --- a/drivers/tee/optee/ffa_abi.c
> +++ b/drivers/tee/optee/ffa_abi.c
> @@ -528,7 +528,8 @@ static void optee_handle_ffa_rpc(struct tee_context *ctx, struct optee *optee,
>
> static int optee_ffa_yielding_call(struct tee_context *ctx,
> struct ffa_send_direct_data *data,
> - struct optee_msg_arg *rpc_arg)
> + struct optee_msg_arg *rpc_arg,
> + bool system_thread)
> {
> struct optee *optee = tee_get_drvdata(ctx->teedev);
> struct ffa_device *ffa_dev = optee->ffa.ffa_dev;
> @@ -541,7 +542,7 @@ static int optee_ffa_yielding_call(struct tee_context *ctx,
> int rc;
>
> /* Initialize waiter */
> - optee_cq_wait_init(&optee->call_queue, &w);
> + optee_cq_wait_init(&optee->call_queue, &w, system_thread);
> while (true) {
> rc = msg_ops->sync_send_receive(ffa_dev, data);
> if (rc)
> @@ -612,7 +613,8 @@ 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,
> @@ -642,7 +644,7 @@ static int optee_ffa_do_call_with_arg(struct tee_context *ctx,
> if (IS_ERR(rpc_arg))
> return PTR_ERR(rpc_arg);
>
> - return optee_ffa_yielding_call(ctx, &data, rpc_arg);
> + return optee_ffa_yielding_call(ctx, &data, rpc_arg, system_thread);
> }
>
> /*
> diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
> index 72685ee0d53f..b68273051454 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);
> @@ -301,7 +304,7 @@ static inline void optee_to_msg_param_value(struct optee_msg_param *mp,
> }
>
> void optee_cq_wait_init(struct optee_call_queue *cq,
> - struct optee_call_waiter *w);
> + struct optee_call_waiter *w, bool sys_thread);
> void optee_cq_wait_for_completion(struct optee_call_queue *cq,
> struct optee_call_waiter *w);
> void optee_cq_wait_final(struct optee_call_queue *cq,
> diff --git a/drivers/tee/optee/smc_abi.c b/drivers/tee/optee/smc_abi.c
> index 49702cb08f4f..e2763cdcf111 100644
> --- a/drivers/tee/optee/smc_abi.c
> +++ b/drivers/tee/optee/smc_abi.c
> @@ -283,7 +283,7 @@ static void optee_enable_shm_cache(struct optee *optee)
> struct optee_call_waiter w;
>
> /* We need to retry until secure world isn't busy. */
> - optee_cq_wait_init(&optee->call_queue, &w);
> + optee_cq_wait_init(&optee->call_queue, &w, false);
> while (true) {
> struct arm_smccc_res res;
>
> @@ -308,7 +308,7 @@ static void __optee_disable_shm_cache(struct optee *optee, bool is_mapped)
> struct optee_call_waiter w;
>
> /* We need to retry until secure world isn't busy. */
> - optee_cq_wait_init(&optee->call_queue, &w);
> + optee_cq_wait_init(&optee->call_queue, &w, false);
> while (true) {
> union {
> struct arm_smccc_res smccc;
> @@ -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;
> @@ -926,7 +927,7 @@ static int optee_smc_do_call_with_arg(struct tee_context *ctx,
> reg_pair_from_64(¶m.a1, ¶m.a2, parg);
> }
> /* Initialize waiter */
> - optee_cq_wait_init(&optee->call_queue, &w);
> + optee_cq_wait_init(&optee->call_queue, &w, system_thread);
> while (true) {
> struct arm_smccc_res res;
>
> @@ -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
>
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