Re: [PATCH 3/3] mce: acpi/apei: trace: Enable ghes memory error trace event

Mauro Carvalho Chehab
2013-08-13T12:42:27Z

Em Tue, 13 Aug 2013 17:11:18 +0530
"Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com> escreveu:

> On 08/12/2013 08:14 PM, Mauro Carvalho Chehab wrote:
> >> But, this only seems to expose the APEI data as a string
> >> and doesn't look to really make all the fields available to user-space
> >> in a raw manner. Not sure how well this can be utilised by a user-space
> >> tool. Do you have suggestions on how we can do this?
> >
> > There's already an userspace tool that handes it:
> > https://git.fedorahosted.org/cgit/rasdaemon.git/
> >
> > What is missing there on the current version is the bits that would allow
> > to translate from APEI way to report an error (memory node, card, module,
> > bank, device) into a DIMM label[1].
>
> If I'm reading this right, all APEI data seems to be squashed into a
> string in mc_event.

Yes. We had lots of discussion about how to map memory errors over the
last couple years. Basically, it was decided that the information that
could be decoded into a DIMM to be mapped as integers, and all other
driver-specific data to be added as strings.

On the tests I did, different machines/vendors fill the APEI data on
a different way, with makes harder to associate them to a DIMM.

> Also, the fru id/text don't seem to be passed to user-space.

That's likely because on the systems I tested, those fields were not
filled (or maybe they appeared on a latter ACPI version). We should add
them also the same string as the other fields there at ghes_edac.

Regards,
Mauro