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Date:   Fri, 4 Nov 2016 21:01:15 -0600
From:   Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
To:     tpmdd-devel@...ts.sourceforge.net
Cc:     Jonathan Corbet <corbet@....net>,
        Stefan Berger <stefanb@...ux.vnet.ibm.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] tpm: transition tpm_vtpm_proxy documentation to the
 Sphinx

On Thu, Nov 03, 2016 at 05:57:51PM -0600, Jarkko Sakkinen wrote:
> Transitioned the tpm_vtpm_proxy documentation to the Sphinx
> infrastructure and removed parts from the documentation that are easier
> to pull from the sources. Restructured vtpm_proxy.h and tpm_vtpm_proxy.c
> to be compatible with this approach and wrote associated documentation
> comments.
> 
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>

Stefan?

/Jarkko

> ---
>  Documentation/index.rst                            |  1 +
>  Documentation/tpm/index.rst                        |  7 +++
>  .../tpm/{tpm_vtpm_proxy.txt => tpm_vtpm_proxy.rst} | 55 +++++++---------------
>  3 files changed, 25 insertions(+), 38 deletions(-)
>  create mode 100644 Documentation/tpm/index.rst
>  rename Documentation/tpm/{tpm_vtpm_proxy.txt => tpm_vtpm_proxy.rst} (53%)
> 
> diff --git a/Documentation/index.rst b/Documentation/index.rst
> index e0fc729..0058b65 100644
> --- a/Documentation/index.rst
> +++ b/Documentation/index.rst
> @@ -19,6 +19,7 @@ Contents:
>     media/dvb-drivers/index
>     media/v4l-drivers/index
>     gpu/index
> +   tpm/index
>  
>  Indices and tables
>  ==================
> diff --git a/Documentation/tpm/index.rst b/Documentation/tpm/index.rst
> new file mode 100644
> index 0000000..af77a7b
> --- /dev/null
> +++ b/Documentation/tpm/index.rst
> @@ -0,0 +1,7 @@
> +=====================================
> +Trusted Platform Module documentation
> +=====================================
> +
> +.. toctree::
> +
> +   tpm_vtpm_proxy
> diff --git a/Documentation/tpm/tpm_vtpm_proxy.txt b/Documentation/tpm/tpm_vtpm_proxy.rst
> similarity index 53%
> rename from Documentation/tpm/tpm_vtpm_proxy.txt
> rename to Documentation/tpm/tpm_vtpm_proxy.rst
> index 30d1902..ea08e76 100644
> --- a/Documentation/tpm/tpm_vtpm_proxy.txt
> +++ b/Documentation/tpm/tpm_vtpm_proxy.rst
> @@ -1,71 +1,50 @@
> +=============================================
>  Virtual TPM Proxy Driver for Linux Containers
> +=============================================
>  
> -Authors: Stefan Berger (IBM)
> +| Authors:
> +| Stefan Berger <stefanb@...ux.vnet.ibm.com>
>  
>  This document describes the virtual Trusted Platform Module (vTPM)
>  proxy device driver for Linux containers.
>  
> -INTRODUCTION
> -------------
> +Introduction
> +============
>  
>  The goal of this work is to provide TPM functionality to each Linux
>  container. This allows programs to interact with a TPM in a container
>  the same way they interact with a TPM on the physical system. Each
>  container gets its own unique, emulated, software TPM.
>  
> -
> -DESIGN
> -------
> +Design
> +======
>  
>  To make an emulated software TPM available to each container, the container
>  management stack needs to create a device pair consisting of a client TPM
> -character device /dev/tpmX (with X=0,1,2...) and a 'server side' file
> +character device ``/dev/tpmX`` (with X=0,1,2...) and a 'server side' file
>  descriptor. The former is moved into the container by creating a character
>  device with the appropriate major and minor numbers while the file descriptor
>  is passed to the TPM emulator. Software inside the container can then send
>  TPM commands using the character device and the emulator will receive the
>  commands via the file descriptor and use it for sending back responses.
>  
> -To support this, the virtual TPM proxy driver provides a device /dev/vtpmx
> +To support this, the virtual TPM proxy driver provides a device ``/dev/vtpmx``
>  that is used to create device pairs using an ioctl. The ioctl takes as
>  an input flags for configuring the device. The flags  for example indicate
>  whether TPM 1.2 or TPM 2 functionality is supported by the TPM emulator.
>  The result of the ioctl are the file descriptor for the 'server side'
>  as well as the major and minor numbers of the character device that was created.
> -Besides that the number of the TPM character device is return. If for
> -example /dev/tpm10 was created, the number (dev_num) 10 is returned.
> -
> -The following is the data structure of the TPM_PROXY_IOC_NEW_DEV ioctl:
> -
> -struct vtpm_proxy_new_dev {
> -	__u32 flags;         /* input */
> -	__u32 tpm_num;       /* output */
> -	__u32 fd;            /* output */
> -	__u32 major;         /* output */
> -	__u32 minor;         /* output */
> -};
> -
> -Note that if unsupported flags are passed to the device driver, the ioctl will
> -fail and errno will be set to EOPNOTSUPP. Similarly, if an unsupported ioctl is
> -called on the device driver, the ioctl will fail and errno will be set to
> -ENOTTY.
> -
> -See /usr/include/linux/vtpm_proxy.h for definitions related to the public interface
> -of this vTPM device driver.
> +Besides that the number of the TPM character device is returned. If for
> +example ``/dev/tpm10`` was created, the number (``dev_num``) 10 is returned.
>  
>  Once the device has been created, the driver will immediately try to talk
>  to the TPM. All commands from the driver can be read from the file descriptor
>  returned by the ioctl. The commands should be responded to immediately.
>  
> -Depending on the version of TPM the following commands will be sent by the
> -driver:
> +UAPI
> +====
>  
> -- TPM 1.2:
> -  - the driver will send a TPM_Startup command to the TPM emulator
> -  - the driver will send commands to read the command durations and
> -    interface timeouts from the TPM emulator
> -- TPM 2:
> -  - the driver will send a TPM2_Startup command to the TPM emulator
> +.. kernel-doc:: include/uapi/linux/vtpm_proxy.h
>  
> -The TPM device /dev/tpmX will only appear if all of the relevant commands
> -were responded to properly.
> +.. kernel-doc:: drivers/char/tpm/tpm_vtpm_proxy.c
> +   :functions: vtpmx_ioc_new_dev
> -- 
> 2.9.3
> 

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