linux-kernel - RE: [tpmdd-devel] [PATCH] tpm: add documentation for sysfs interfaces

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Date:	Mon, 12 Nov 2012 16:36:49 +0000
From:	<Peter.Huewe@...ineon.com>
To:	<key@...ux.vnet.ibm.com>
CC:	<linux-kernel@...r.kernel.org>,
	<tpmdd-devel@...ts.sourceforge.net>,
	<linux-security-module@...r.kernel.org>
Subject: RE: [tpmdd-devel] [PATCH] tpm: add documentation for sysfs
 interfaces

Hi Kent,

> > > +What:            /sys/class/misc/tpmX/device/active
> > > +Date:            April 2006
> > > +KernelVersion:   2.6.17
> > > +Contact: tpmdd-devel@...ts.sf.net
> > > +Description:     The "active" property prints a '1' if the TPM chip is accepting
> > > +         commands. An inactive TPM chip still contains all the state of
> > > +         an active chip (Storage Root Key, NVRAM, etc), and can be
> > > +         visible to the OS, but will not accept commands.
> >
> > Hmm, I know this is a tricky one (enabled/activated).
> > maybe this would be better as:
> > -           visible to the OS, but will not accept commands.
> > +           visible to the OS, but will only accept a restricted set of commands.
> > +           See TCG specification(...) for more information.
>
>   Yeah that's more accurate. I'm just inclined to point to the design
> principles and structures spec here unless you have a better idea. Both
> have enabled/activated info scattered throughout them. Sigh. :)
>

Maybe refer to TPM Main - Part 2 TPM Structures_v1.2_rev116 - Section 17
The table of ordinals there has a special column named 'Avail Disabled' and 'Avail Deactivated' which describes quite good which commands can be used and which not.

Thanks,
Peter
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