linux-kernel - Re: [PATCH] amd64_edac: Memory size reported double on processor family 0Fh

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Message-ID: <20120914154044.GD8789@aftab.osrc.amd.com>
Date:	Fri, 14 Sep 2012 17:40:44 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Josh Hunt <johunt@...mai.com>
Cc:	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] amd64_edac: Memory size reported double on processor
 family 0Fh

On Fri, Sep 14, 2012 at 09:39:00AM -0500, Josh Hunt wrote:
> On 09/14/2012 07:55 AM, Josh Hunt wrote:
> >
> >Thanks to your help I was able to test your branch, but it still does
> >not resolve the problem. Removal of the "factor=1" workaround fixes the
> >memory size reporting on boot, but the sysfs values are still incorrect.
> >
> 
> Please disregard what I said earlier about the shift still being
> wrong. Looking at the dmesg more I see now that the # of pages are
> correctly reported (262144), however sysfs is still wrong.
> 
> [   25.837588] EDAC DEBUG: init_csrows: MC node: 0, csrow: 0
> [   25.837589] EDAC DEBUG: amd64_csrow_nr_pages: csrow: 0, channel:
> 0, DBAM idx: 2
> [   25.837591] EDAC DEBUG: amd64_csrow_nr_pages: nr_pages/channel: 262144
> [   25.837592] EDAC amd64: CS0: Unbuffered DDR2 RAM
> [   25.837724] EDAC DEBUG: init_csrows: Total csrow0 pages: 262144
> [   25.837725] DBG: init_csrows: channel_count:2
> [   25.837856] DBG: init_csrows: channel_count:2
> [   25.837988] EDAC DEBUG: init_csrows: MC node: 0, csrow: 1
> [   25.837989] EDAC DEBUG: amd64_csrow_nr_pages: csrow: 1, channel:
> 0, DBAM idx: 2
> [   25.837991] EDAC DEBUG: amd64_csrow_nr_pages: nr_pages/channel: 262144
> [   25.837992] EDAC amd64: CS1: Unbuffered DDR2 RAM
> [   25.838157] EDAC DEBUG: init_csrows: Total csrow1 pages: 262144
> [   25.838158] DBG: init_csrows: channel_count:2
> [   25.838289] DBG: init_csrows: channel_count:2
> [   25.838421] EDAC DEBUG: init_csrows: MC node: 0, csrow: 2
> [   25.838422] EDAC DEBUG: amd64_csrow_nr_pages: csrow: 2, channel:
> 0, DBAM idx: 2
> [   25.838424] EDAC DEBUG: amd64_csrow_nr_pages: nr_pages/channel: 262144
> [   25.838425] EDAC amd64: CS2: Unbuffered DDR2 RAM
> [   25.838556] EDAC DEBUG: init_csrows: Total csrow2 pages: 262144
> [   25.838558] DBG: init_csrows: channel_count:2
> [   25.838689] DBG: init_csrows: channel_count:2
> [   25.838820] EDAC DEBUG: init_csrows: MC node: 0, csrow: 3
> [   25.838822] EDAC DEBUG: amd64_csrow_nr_pages: csrow: 3, channel:
> 0, DBAM idx: 2
> [   25.838823] EDAC DEBUG: amd64_csrow_nr_pages: nr_pages/channel: 262144
> [   25.838824] EDAC amd64: CS3: Unbuffered DDR2 RAM
> [   25.838957] EDAC DEBUG: init_csrows: Total csrow3 pages: 262144
> 
> I looked into this and see that sysfs is doing the double counting
> b/c it loops over the # of channels:
> 
> [  131.423949] DBG: csrow_size_show: i:0 nr_pages:262144 nr_channels:2
> [  131.424112] DBG: csrow_size_show: i:1 nr_pages:524288 nr_channels:2
> 
> I verified this in init_csrows:
> [   25.838958] DBG: init_csrows: channel_count:2
> 
> Since I don't know the details of the hardware here it's hard for me
> to suggest a fix, but it would seem that k8_early_channel_count()
> needs to be modified to only return 1 in this case?

Yeah, there are still some issues after the whole change to per-dimm
accounting came in. I'm looking into it.

Thanks for testing and reporting. If you see anything else out of the
ordinary, let me know too so that I can fix it.

Thanks.

-- 
Regards/Gruss,
Boris.

Advanced Micro Devices GmbH
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