PSU (PMBus) fault monitoring / logging

[Brandon Wyman]

The IBM systems use an ibm-cffps device driver:

https://github.com/openbmc/linux/blob/dev-5.4/drivers/hwmon/pmbus/ibm-cffps.c

There are some other power supply PMBus hwmon drivers, check the parent 
directory.

There were some other non-standard or MFR SPECIFIC items that were 
needed/desired, so those ended up being put in a /sys/kernel/debug tree.

This device driver was introduced for the Witherspoon system, and has 
had some updates since then.

The repository for looking at the STATUS_WORD and other PMBus 
commands/registers was called witherspoon-pfault-analysis, renamed to 
phosphor-power. I am not certain how that relates to the psusensor daemon.

https://github.com/openbmc/witherspoon-pfault-analysis

https://github.ibm.com/openbmc/phosphor-power

https://github.com/openbmc/dbus-sensors/tree/master/src

The hwmon specific information that Witherspoon used for telemetry data 
was updated via the phosphor-hwmon application:

https://github.com/openbmc/phosphor-hwmon

https://github.com/openbmc/openbmc/tree/master/meta-ibm/meta-witherspoon/recipes-phosphor/sensors/phosphor-hwmon/witherspoon/obmc/hwmon/ahb/apb/bus%401e78a000/i2c-bus%40100

https://github.com/openbmc/openbmc/tree/master/meta-inspur/meta-fp5280g2/recipes-phosphor/sensors/phosphor-hwmon/obmc/hwmon/ahb/apb/bus%401e78a000/i2c-bus%40400

On 2020-04-17 18:29, Patrick Voelker wrote:
>
> Thanks Vijay, that was really helpful.
>
> I’m specifically looking for how the PMBus STATUS_WORD and 
> sub-registers are monitored and represented in OpenBMC but it’s not 
> jumping out at me.
>
> *From:*Vijay Khemka [mailto:vijaykhemka at fb.com]
> *Sent:* Friday, April 17, 2020 11:07 AM
> *To:* Patrick Voelker; openbmc at lists.ozlabs.org
> *Subject:* Re: PSU (PMBus) fault monitoring / logging
>
> There are psusensor daemon who monitors these PSU sensors.
>
> *From: *openbmc <openbmc-bounces+vijaykhemka=fb.com at lists.ozlabs.org> 
> on behalf of Patrick Voelker <Patrick_Voelker at phoenix.com>
> *Date: *Thursday, April 16, 2020 at 7:40 PM
> *To: *"openbmc at lists.ozlabs.org" <openbmc at lists.ozlabs.org>
> *Subject: *PSU (PMBus) fault monitoring / logging
>
> Is there a module that instantiates sensors for PSU PMBus based faults 
> after the entity-manager probes the busses and finds the PSUs by FRU
>
> I'm looking for the method by which the faults are monitored and 
> logged.  I see that there’s kernel hwmon support for PMBus but I’m 
> trying to understand how IPMI sensors and logging tie in.
>
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