linux-kernel - Re: [PATCH 2/2 v2] tpm_tis: override durations for STM tpm with firmware 1.2.8.28

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Date:   Thu, 29 Aug 2019 11:04:44 -0700
From:   Jerry Snitselaar <jsnitsel@...hat.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        Peter Huewe <peterhuewe@....de>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Alexey Klimov <aklimov@...hat.com>
Subject: Re: [PATCH 2/2 v2] tpm_tis: override durations for STM tpm with
 firmware 1.2.8.28

On Thu Aug 29 19, Jarkko Sakkinen wrote:
>On Thu, Aug 29, 2019 at 05:40:40PM +0300, Jarkko Sakkinen wrote:
>> On Tue, Aug 27, 2019 at 05:46:21PM -0700, Jerry Snitselaar wrote:
>> > There was revealed a bug in the STM TPM chipset used in Dell R415s.
>> > Bug is observed so far only on chipset firmware 1.2.8.28
>> > (1.2 TPM, device-id 0x0, rev-id 78). After some number of
>> > operations chipset hangs and stays in inconsistent state:
>> >
>> > tpm_tis 00:09: Operation Timed out
>> > tpm_tis 00:09: tpm_transmit: tpm_send: error -5
>> >
>> > Durations returned by the chip are the same like on other
>> > firmware revisions but apparently with specifically 1.2.8.28 fw
>> > durations should be reset to 2 minutes to enable tpm chip work
>> > properly. No working way of updating firmware was found.
>> >
>> > This patch adds implementation of ->update_durations method
>> > that matches only STM devices with specific firmware version.
>> >
>> > Cc: Peter Huewe <peterhuewe@....de>
>> > Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
>> > Cc: Jason Gunthorpe <jgg@...pe.ca>
>> > Signed-off-by: Alexey Klimov <aklimov@...hat.com>
>> > Signed-off-by: Jerry Snitselaar <jsnitsel@...hat.com>
>> > ---
>> > v2: Make suggested changes from Jarkko
>> >     - change struct field name to durations from durs
>> >     - formatting cleanups
>> >     - turn into void function like update_timeouts and
>> >       use chip->duration_adjusted to track whether adjustment occurred.
>>
>> The code repetition looks horrible so I wrote a patch that should help:
>>
>> https://patchwork.kernel.org/patch/11121475/
>>
>> Read the remar that prepends the diffstat.
>
>Forgot from that remark that I did not have TPM 1.x available at hand
>(WFH today) so please also review and test it.
>
>/Jrakko

I will test it this morning, and once that is done I'll submit a v3 that
cleans up the version comparison in the update_durations function.