linux-kernel - Re: [PATCH 3/3] ie31200

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Date:	Wed, 09 Apr 2014 18:15:31 -0400
From:	Jason Baron <jbaron@...mai.com>
To:	"Luck, Tony" <tony.luck@...el.com>
CC:	Borislav Petkov <bp@...en8.de>, Aristeu Rozanski <aris@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"mingo@...nel.org" <mingo@...nel.org>,
	"dougthompson@...ssion.com" <dougthompson@...ssion.com>,
	"m.chehab@...sung.com" <m.chehab@...sung.com>,
	"mitake@....info.waseda.ac.jp" <mitake@....info.waseda.ac.jp>,
	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] ie31200_edac: Add driver

On 04/09/2014 05:33 PM, Luck, Tony wrote:
>> Unfortunately, the box reporting the ue errors just went into transit (so
>> that I can better examine this issue), so I will probably not be able to
>> run this experiment on that specific box until next week.
> 
> Do you have any other logs from this machine.  Is there something
> logged in one (or more) of the machine check banks when your EDAC
> driver says that there are uncorrected errors?
>
> When the box is back  online again - I'd be interested to know if mcelog(8)
> daemon reports any errors.   Grab the latest from mcelog.org, compile
> and run as "mcelog --daemon".  Logs show up in /var/log/mcelog
>


So when the driver sees uncorrected errors, I'm also seeing them in my
memory scanning program - so they correspond nicely. I didn't see anything
logged in /var/log/mcelog, but I will update to the latest when possible.

 
>> # ./rdmsr 0x179
>> c09
> 
> So this processor does support CMCI - next question is whether each
> bank support it (and got enabled by Linux) [can run on any system ... don't
> need to wait for the one to finish transit)]
> 
> # for I in `seq 0 8`
> do
>        ./rdmsr 0x28$i
> done
> 
> will print the MCi_CTL2 registers from each bank. Bit 30 (0x40000000)
> shows CMCI enabled.
>

>From the similar system:

# for i in `seq 0 8`; do ./rdmsr 0x28$i; done
40000001
40000001
0
40000001
0
40000001
40000001
40000001
40000001

So looks like cmci is eenabled on the banks. But like I said on the box with the ue errors I
didn't see 'THR' or 'MCE' increment in /proc/interrupts.

 
> On the name of the driver - can you throw in an underscore: ie3_12xx.c ?
> 
> Do you have systems from Sandy Bridge, Ivy Bridge and Haswell generations
> (no suffix for Sandy Bridge, then v2 and v3) ... and does this driver work across all of
> them?  If it is just for Haswell ... then "ie3_12xx_v3.c" might be a better name.
> 

I do have all the above systems. The one with the memory errors in a Sandy Bridge. On
the other systems I can only say that the driver loads and reports the rank information
correctly. IE I haven't hit the error paths on those.

Thanks,

-Jason

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