linux-kernel - Re: [PATCH v2] Documentation: tpm

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Date: Thu, 21 Mar 2024 18:32:40 +0200
From: "Jarkko Sakkinen" <jarkko@...nel.org>
To: "Jarkko Sakkinen" <jarkko@...nel.org>, "Stefan Berger"
 <stefanb@...ux.ibm.com>, <linux-integrity@...r.kernel.org>
Cc: "Jonathan Corbet" <corbet@....net>, "Daniel P . Smith"
 <dpsmith@...rtussolutions.com>, "Lino Sanfilippo"
 <l.sanfilippo@...bus.com>, "Jason Gunthorpe" <jgg@...pe.ca>, "Peter Huewe"
 <peterhuewe@....de>, "James Bottomley"
 <James.Bottomley@...senPartnership.com>, "Alexander Steffen"
 <Alexander.Steffen@...ineon.com>, <keyrings@...r.kernel.org>,
 <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>, "Randy Dunlap"
 <rdunlap@...radead.org>
Subject: Re: [PATCH v2] Documentation: tpm_tis

On Thu Mar 21, 2024 at 6:24 PM EET, Jarkko Sakkinen wrote:
> On Thu Mar 21, 2024 at 6:09 PM EET, Stefan Berger wrote:
> >
> >
> > On 3/21/24 11:51, Jarkko Sakkinen wrote:
> > > On Wed Mar 20, 2024 at 6:15 PM EET, Stefan Berger wrote:
> > >>
> > >>
> > >> On 3/20/24 04:56, Jarkko Sakkinen wrote:
> > >>> Based recent discussions on LKML, provide preliminary bits of tpm_tis_core
> > >>> dependent drivers. Includes only bare essentials but can be extended later
> > >>> on case by case. This way some people may even want to read it later on.
> > >>>
> > >>> Cc: Jonathan Corbet <corbet@....net>
> > >>> CC: Daniel P. Smith <dpsmith@...rtussolutions.com>
> > >>> Cc: Lino Sanfilippo <l.sanfilippo@...bus.com>
> > >>> Cc: Jason Gunthorpe <jgg@...pe.ca>
> > >>> Cc: Peter Huewe <peterhuewe@....de>
> > >>> Cc: James Bottomley <James.Bottomley@...senPartnership.com>
> > >>> Cc: Alexander Steffen <Alexander.Steffen@...ineon.com>
> > >>> Cc: keyrings@...r.kernel.org
> > >>> Cc: linux-doc@...r.kernel.org
> > >>> Cc: linux-kernel@...r.kernel.org
> > >>> Cc: linux-integrity@...r.kernel.org
> > >>> Cc: Randy Dunlap <rdunlap@...radead.org>
> > >>> Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
> > >>> ---
> > >>> v2:
> > >>> - Fixed errors reported by Randy:
> > >>>     https://lore.kernel.org/all/aed28265-d677-491a-a045-24b351854b24@infradead.org/
> > >>> - Improved the text a bit to have a better presentation.
> > >>> ---
> > >>>    Documentation/security/tpm/index.rst   |  1 +
> > >>>    Documentation/security/tpm/tpm_tis.rst | 30 ++++++++++++++++++++++++++
> > >>>    2 files changed, 31 insertions(+)
> > >>>    create mode 100644 Documentation/security/tpm/tpm_tis.rst
> > >>>
> > >>> diff --git a/Documentation/security/tpm/index.rst b/Documentation/security/tpm/index.rst
> > >>> index fc40e9f23c85..f27a17f60a96 100644
> > >>> --- a/Documentation/security/tpm/index.rst
> > >>> +++ b/Documentation/security/tpm/index.rst
> > >>> @@ -5,6 +5,7 @@ Trusted Platform Module documentation
> > >>>    .. toctree::
> > >>>    
> > >>>       tpm_event_log
> > >>> +   tpm_tis
> > >>>       tpm_vtpm_proxy
> > >>>       xen-tpmfront
> > >>>       tpm_ftpm_tee
> > >>> diff --git a/Documentation/security/tpm/tpm_tis.rst b/Documentation/security/tpm/tpm_tis.rst
> > >>> new file mode 100644
> > >>> index 000000000000..b331813b3c45
> > >>> --- /dev/null
> > >>> +++ b/Documentation/security/tpm/tpm_tis.rst
> > >>> @@ -0,0 +1,30 @@
> > >>> +.. SPDX-License-Identifier: GPL-2.0
> > >>> +
> > >>> +=========================
> > >>> +TPM FIFO interface Driver
> > >>> +=========================
> > >>> +
> > >>> +FIFO (First-In-First-Out) is the name of the hardware interface used by the
> > >>
> > >> FIFO is the type. I am surprised you call it a 'name'. I would say TIS
> > >> is the 'name'.
> > > 
> > > It's what the official specification calls it [1].
> > > 
> > > 
> > >>
> > >>> +tpm_tis_core dependent drivers. The prefix "tis" comes from the TPM Interface
> > >>
> > >> tis is a tla -- a three letter *acronym*. You aren't using it as a 'prefix'.
> > > 
> > > I don't know what "tla" means.
> > > 
> > >>
> > >>> +Specification, which is the hardware interface specification for TPM 1.x chips.
> > >>
> > >> It's also available for TPM2.
> > >   
> > > Yes, but TIS is the name used by the legacy specification.
> >
> >
> > The point is that TIS is not just a TPM 1.x interface but also used for 
> > TPM 2.
>
>
> FIFO interface is what is  used in the spec so I'll stick to that.

E.g. Table 15 - *FIFO* Interface Identifier Register

Not *TIS* Inteface Identifier Register.

I don't want to invent my own terminology here and this the spec
that we usually refer in every possible discussion around the topic.

BR, Jarkko