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

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Date:	Tue, 13 Aug 2013 09:41:47 -0300
From:	Mauro Carvalho Chehab <m.chehab@...sung.com>
To:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:	Borislav Petkov <bp@...en8.de>, tony.luck@...el.com,
	bhelgaas@...gle.com, rostedt@...dmis.org, rjw@...k.pl,
	lance.ortiz@...com, linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
	Aristeu Rozanski Filho <arozansk@...hat.com>
Subject: Re: [PATCH 3/3] mce: acpi/apei: trace: Enable ghes memory error trace
 event

Em Tue, 13 Aug 2013 17:11:18 +0530
"Naveen N. Rao" <naveen.n.rao@...ux.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
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