Linux-Integrity Archive on lore.kernel.org
 help / color / Atom feed
From: Sumit Garg <sumit.garg@linaro.org>
To: Maxim Uvarov <maxim.uvarov@linaro.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	"tee-dev @ lists . linaro . org" <tee-dev@lists.linaro.org>,
	peterhuewe@gmx.de,
	Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
	jgg@ziepe.ca, Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jens Wiklander <jens.wiklander@linaro.org>,
	linux-integrity@vger.kernel.org, Arnd Bergmann <arnd@linaro.org>
Subject: Re: [PATCHv2 1/2] optee: do drivers initialization before and after tee-supplicant run
Date: Fri, 22 May 2020 17:10:42 +0530
Message-ID: <CAFA6WYOWj4umG+c7nDxeH-dm+W9uMxQPKvT_hKrYTd81af7HLA@mail.gmail.com> (raw)
In-Reply-To: <20200521064743.4769-2-maxim.uvarov@linaro.org>

Hi Maxim,

On Thu, 21 May 2020 at 12:17, Maxim Uvarov <maxim.uvarov@linaro.org> wrote:
>
> Some drivers (like ftpm) can operate only after tee-supplicant
> runs becase of tee-supplicant provides things like storage
> services.  This patch splits probe of non tee-supplicant dependable
> drivers to early stage, and after tee-supplicant run probe other
> drivers.
>
> Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>
> Suggested-by: Sumit Garg <sumit.garg@linaro.org>
> Suggested-by: Arnd Bergmann <arnd@linaro.org>
> ---
>  drivers/tee/optee/core.c          | 25 ++++++++++++++++++++++---
>  drivers/tee/optee/device.c        | 17 +++++++++++------
>  drivers/tee/optee/optee_private.h |  8 +++++++-
>  3 files changed, 40 insertions(+), 10 deletions(-)
>

This patch still doesn't seem to address the issue (duplicate devices
leading to sysfs registration failure) that was pointed during OP-TEE
patch review [1].

You could reproduce it simply with one TA having TA_FLAG_DEVICE_ENUM
flag and other TA having TA_FLAG_DEVICE_ENUM_SUPP flag.

[1] https://github.com/OP-TEE/optee_os/pull/3840#discussion_r425144487

-Sumit

> diff --git a/drivers/tee/optee/core.c b/drivers/tee/optee/core.c
> index 99698b8a3a74..dd2265c44907 100644
> --- a/drivers/tee/optee/core.c
> +++ b/drivers/tee/optee/core.c
> @@ -17,6 +17,7 @@
>  #include <linux/tee_drv.h>
>  #include <linux/types.h>
>  #include <linux/uaccess.h>
> +#include <linux/workqueue.h>
>  #include "optee_private.h"
>  #include "optee_smc.h"
>  #include "shm_pool.h"
> @@ -218,6 +219,15 @@ static void optee_get_version(struct tee_device *teedev,
>         *vers = v;
>  }
>
> +static void optee_bus_scan(struct work_struct *work)
> +{
> +       int rc;
> +
> +       rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES_SUPP);
> +       if (rc)
> +               pr_err("optee_enumerate_devices failed %d\n", rc);
> +}
> +
>  static int optee_open(struct tee_context *ctx)
>  {
>         struct optee_context_data *ctxdata;
> @@ -241,8 +251,15 @@ static int optee_open(struct tee_context *ctx)
>                         kfree(ctxdata);
>                         return -EBUSY;
>                 }
> -       }
>
> +               INIT_WORK(&optee->scan_bus_work, optee_bus_scan);
> +               optee->scan_bus_wq = create_workqueue("optee_bus_scan");
> +               if (!optee->scan_bus_wq) {
> +                       pr_err("optee: couldn't create workqueue\n");
> +                       return -ECHILD;
> +               }
> +               queue_work(optee->scan_bus_wq, &optee->scan_bus_work);
> +       }
>         mutex_init(&ctxdata->mutex);
>         INIT_LIST_HEAD(&ctxdata->sess_list);
>
> @@ -296,8 +313,10 @@ static void optee_release(struct tee_context *ctx)
>
>         ctx->data = NULL;
>
> -       if (teedev == optee->supp_teedev)
> +       if (teedev == optee->supp_teedev) {
> +               destroy_workqueue(optee->scan_bus_wq);
>                 optee_supp_release(&optee->supp);
> +       }
>  }
>
>  static const struct tee_driver_ops optee_ops = {
> @@ -675,7 +694,7 @@ static int optee_probe(struct platform_device *pdev)
>
>         platform_set_drvdata(pdev, optee);
>
> -       rc = optee_enumerate_devices();
> +       rc = optee_enumerate_devices(PTA_CMD_GET_DEVICES);
>         if (rc) {
>                 optee_remove(pdev);
>                 return rc;
> diff --git a/drivers/tee/optee/device.c b/drivers/tee/optee/device.c
> index e3a148521ec1..d4931dad07aa 100644
> --- a/drivers/tee/optee/device.c
> +++ b/drivers/tee/optee/device.c
> @@ -21,7 +21,6 @@
>   * TEE_ERROR_BAD_PARAMETERS - Incorrect input param
>   * TEE_ERROR_SHORT_BUFFER - Output buffer size less than required
>   */
> -#define PTA_CMD_GET_DEVICES            0x0
>
>  static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
>  {
> @@ -32,7 +31,8 @@ static int optee_ctx_match(struct tee_ioctl_version_data *ver, const void *data)
>  }
>
>  static int get_devices(struct tee_context *ctx, u32 session,
> -                      struct tee_shm *device_shm, u32 *shm_size)
> +                      struct tee_shm *device_shm, u32 *shm_size,
> +                      u32 func)
>  {
>         int ret = 0;
>         struct tee_ioctl_invoke_arg inv_arg;
> @@ -42,7 +42,7 @@ static int get_devices(struct tee_context *ctx, u32 session,
>         memset(&param, 0, sizeof(param));
>
>         /* Invoke PTA_CMD_GET_DEVICES function */
> -       inv_arg.func = PTA_CMD_GET_DEVICES;
> +       inv_arg.func = func;
>         inv_arg.session = session;
>         inv_arg.num_params = 4;
>
> @@ -87,7 +87,7 @@ static int optee_register_device(const uuid_t *device_uuid, u32 device_id)
>         return rc;
>  }
>
> -int optee_enumerate_devices(void)
> +static int __optee_enumerate_devices(u32 func)
>  {
>         const uuid_t pta_uuid =
>                 UUID_INIT(0x7011a688, 0xddde, 0x4053,
> @@ -118,7 +118,7 @@ int optee_enumerate_devices(void)
>                 goto out_ctx;
>         }
>
> -       rc = get_devices(ctx, sess_arg.session, NULL, &shm_size);
> +       rc = get_devices(ctx, sess_arg.session, NULL, &shm_size, func);
>         if (rc < 0 || !shm_size)
>                 goto out_sess;
>
> @@ -130,7 +130,7 @@ int optee_enumerate_devices(void)
>                 goto out_sess;
>         }
>
> -       rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size);
> +       rc = get_devices(ctx, sess_arg.session, device_shm, &shm_size, func);
>         if (rc < 0)
>                 goto out_shm;
>
> @@ -158,3 +158,8 @@ int optee_enumerate_devices(void)
>
>         return rc;
>  }
> +
> +int optee_enumerate_devices(u32 func)
> +{
> +       return  __optee_enumerate_devices(func);
> +}
> diff --git a/drivers/tee/optee/optee_private.h b/drivers/tee/optee/optee_private.h
> index d9c5037b4e03..6cdac4bb7253 100644
> --- a/drivers/tee/optee/optee_private.h
> +++ b/drivers/tee/optee/optee_private.h
> @@ -78,6 +78,8 @@ struct optee_supp {
>   * @memremaped_shm     virtual address of memory in shared memory pool
>   * @sec_caps:          secure world capabilities defined by
>   *                     OPTEE_SMC_SEC_CAP_* in optee_smc.h
> + * @scan_bus_wq                workqueue to scan optee bus and register optee drivers
> + * @scan_bus_work      workq to scan optee bus and register optee drivers
>   */
>  struct optee {
>         struct tee_device *supp_teedev;
> @@ -89,6 +91,8 @@ struct optee {
>         struct tee_shm_pool *pool;
>         void *memremaped_shm;
>         u32 sec_caps;
> +       struct workqueue_struct *scan_bus_wq;
> +       struct work_struct scan_bus_work;
>  };
>
>  struct optee_session {
> @@ -173,7 +177,9 @@ void optee_free_pages_list(void *array, size_t num_entries);
>  void optee_fill_pages_list(u64 *dst, struct page **pages, int num_pages,
>                            size_t page_offset);
>
> -int optee_enumerate_devices(void);
> +#define PTA_CMD_GET_DEVICES            0x0
> +#define PTA_CMD_GET_DEVICES_SUPP       0x1
> +int optee_enumerate_devices(u32 func);
>
>  /*
>   * Small helpers
> --
> 2.17.1
>

  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-21  6:47 [PATCHv2 0/2] optee: register drivers on optee bus Maxim Uvarov
2020-05-21  6:47 ` [PATCHv2 1/2] optee: do drivers initialization before and after tee-supplicant run Maxim Uvarov
2020-05-22 11:40   ` Sumit Garg [this message]
2020-05-22 12:23     ` Maxim Uvarov
2020-05-24  6:22   ` Jens Wiklander
2020-05-25  7:12     ` Maxim Uvarov
2020-05-21  6:47 ` [PATCH 2/2] tpm_ftpm_tee: register driver on tee bus Maxim Uvarov
2020-05-21  6:47 ` [PATCHv2 2/2] tpm_ftpm_tee: register driver on TEE bus Maxim Uvarov
2020-05-22 17:14   ` Jarkko Sakkinen
2020-05-22 19:29     ` Maxim Uvarov
2020-05-22 20:03       ` Jarkko Sakkinen
2020-05-25  6:50         ` Maxim Uvarov
2020-05-26  9:22           ` Sumit Garg
2020-05-27 19:42           ` Jarkko Sakkinen
2020-05-28  8:08             ` Maxim Uvarov
2020-05-28 10:11               ` Jens Wiklander
2020-05-29  5:28                 ` Sumit Garg

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CAFA6WYOWj4umG+c7nDxeH-dm+W9uMxQPKvT_hKrYTd81af7HLA@mail.gmail.com \
    --to=sumit.garg@linaro.org \
    --cc=arnd@linaro.org \
    --cc=gregkh@linuxfoundation.org \
    --cc=jarkko.sakkinen@linux.intel.com \
    --cc=jens.wiklander@linaro.org \
    --cc=jgg@ziepe.ca \
    --cc=linux-integrity@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=maxim.uvarov@linaro.org \
    --cc=peterhuewe@gmx.de \
    --cc=tee-dev@lists.linaro.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Integrity Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-integrity/0 linux-integrity/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-integrity linux-integrity/ https://lore.kernel.org/linux-integrity \
		linux-integrity@vger.kernel.org
	public-inbox-index linux-integrity

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-integrity


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git