linux-kernel - Re: [PATCH v3 00/13] Introduce PECI subsystem

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Date:   Wed, 17 Nov 2021 23:25:35 +0000
From:   "Winiarska, Iwona" <iwona.winiarska@...el.com>
To:     "zweiss@...inix.com" <zweiss@...inix.com>
CC:     "corbet@....net" <corbet@....net>,
        "jae.hyun.yoo@...ux.intel.com" <jae.hyun.yoo@...ux.intel.com>,
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        "andrew@...id.au" <andrew@...id.au>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
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Subject: Re: [PATCH v3 00/13] Introduce PECI subsystem

On Wed, 2021-11-17 at 03:56 +0000, Zev Weiss wrote:
> On Mon, Nov 15, 2021 at 10:25:39AM PST, Iwona Winiarska wrote:
> > Hi,
> > 
> > This is a third round of patches introducing PECI subsystem.
> > Sorry for the delay between v2 and v3.
> > 
> 
> Hi Iwona,
> 
> I've done some testing of these patches on my AST2500/E-2778G OpenBMC
> platform -- I had to do a small bit of hacking to add support for
> INTEL_FAM6_KABYLAKE, but with that in place the newly-added code for the
> 8.8 format seems to work as it should.  Thanks!

Thanks for the report and testing :)

> 
> In poking at it a bit further I encountered some sub-optimal behavior
> w.r.t. to host power state transitions and timeouts though --
> essentially, if I ever hit a timeout in aspeed_peci_xfer() (for example
> on a read of a hwmon tempX_input file after an unexpected host
> shutdown), it seems to get stuck in a state where even if the host comes
> back online, all attempted PECI transfers continue just timing out.
> (Rebooting the BMC seems to resolve the problem.)  This also happens if
> I remove the peci client device via the 'remove' sysfs file, shut down
> the host, and then do a rescan via sysfs while the host is off (i.e.
> another operation that times out).
> 
> Let me know if there's any other info that would be helpful for
> debugging.

That's unexpected. I do have an idea what might have caused that. Let me fix it
in v4.

Thanks
-Iwona

> 
> 
> Thanks,
> Zev