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

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Date:	Mon, 12 Nov 2012 09:18:48 -0600
From:	Kent Yoder <key@...ux.vnet.ibm.com>
To:	Peter.Huewe@...ineon.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 Peter,

On Mon, Nov 12, 2012 at 08:47:55AM +0000, Peter.Huewe@...ineon.com wrote:
> Hi Kent,
> 
> thanks a lot for this effort!
> I really appreciate it.
> 
> > +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. :)

> 
> 
> > +What:		/sys/class/misc/tpmX/device/cancel
> > +Date:		June 2005
> > +KernelVersion:	2.6.13
> > +Contact:	tpmdd-devel@...ts.sf.net
> > +Description:	The "cancel" property allows you to cancel the currently
> > +		pending TPM command. Echoing any value to cancel will call the
> > +		TPM vendor specific cancel operation.
> 
> I'd go for writing instead of echoing but this might only be bike-shedding.
> -		pending TPM command. Echoing any value to cancel will call the
> +		pending TPM command. Writing any value to cancel will call the

  Sounds good.

Thanks,
Kent

> 
> The rest is great.
> Reviewed-by: Peter Huewe <peter.huewe@...ineon.com>
> Signed-off-by: Peter Huewe <peter.huewe@...ineon.com> 
> 	
> 
> Thanks,
> Peter
> 

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