linux-kernel - Re: Aw: Re: [tpmdd-devel] [PATCH] tpm: improve tpm_tis send() performance by ignoring burstcount

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Message-Id: <9cb350b6-32fd-529e-eb31-6800339cddb2@linux.vnet.ibm.com>
Date:   Fri, 11 Aug 2017 17:32:12 -0400
From:   Ken Goldman <kgold@...ux.vnet.ibm.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     linux-ima-devel@...ts.sourceforge.net,
        linux-security-module@...r.kernel.org,
        tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: Aw: Re: [tpmdd-devel] [PATCH] tpm: improve tpm_tis send()
 performance by ignoring burstcount

On 8/9/2017 5:00 PM, Peter Huewe wrote:
> 
> Since we are the linux kernel, we do have to care for legacy
> devices. And a system with LPC, PS2Mouse on SuperIO and a TPM are not
> that uncommon.
> 
> And heck, we even have support for 1.1b TPM devices....

Understood.  However, remember that SuperIO is a 1980's device that
predates the TPM.  Since the TPM requires special LPC bus cycles, it's
even less likely that an old chipset has an attached TPM.

> Interesting - let me check with Georg tomorrow. Unfortunately I do
> not have access to my tcg mails from home (since I'm not working :), 
> but did you _explicitly_ talk about LPC and the system? I'm sure the
> TPM does not care about the waitstates...

Yes, Infineon was one of the 3 TPM vendors who confirmed this.