From: <Peter.Huewe@infineon.com>
To: <key@linux.vnet.ibm.com>
CC: <linux-kernel@vger.kernel.org>, <tpmdd-devel@lists.sourceforge.net>,
        <linux-security-module@vger.kernel.org>
Subject: RE: [tpmdd-devel] [PATCH] tpm: add documentation for sysfs
 interfaces
Thread-Topic: [tpmdd-devel] [PATCH] tpm: add documentation for sysfs
 interfaces
Thread-Index: AQHNvdXCMTFMLtSZ0U2RcQhDHKg9R5fl6MHQgABc1gCAAB8NIA==
Date: Mon, 12 Nov 2012 16:36:49 +0000
Message-ID: <74A44E99E3274B4CB570415926B37D440F6AD6@MUCSE501.eu.infineon.com>
References: <20121108171006.GA30286@ennui.austin.ibm.com>
 <74A44E99E3274B4CB570415926B37D440F6973@MUCSE501.eu.infineon.com>
 <20121112151846.GA31987@ennui.austin.ibm.com>
In-Reply-To: <20121112151846.GA31987@ennui.austin.ibm.com>
Accept-Language: de-DE, en-US
Content-Language: de-DE
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 8BIT
MIME-Version: 1.0
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1510
Lines: 32

Hi Kent,

> > > +What:            /sys/class/misc/tpmX/device/active
> > > +Date:            April 2006
> > > +KernelVersion:   2.6.17
> > > +Contact: tpmdd-devel@lists.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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/