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

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Message-ID: <53459481.9020908@akamai.com>
Date:	Wed, 09 Apr 2014 14:42:09 -0400
From:	Jason Baron <jbaron@...mai.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	"tony.luck@...el.com" <tony.luck@...el.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 07:35 AM, Borislav Petkov wrote:
> On Fri, Apr 04, 2014 at 09:14:04PM +0000, Jason Baron wrote:
>> Add 'ie31200_edac' driver for the E3-1200 series of Intel processors. Driver
>> is based on the following E3-1200 specs:
>>
>> http://www.intel.com/content/www/us/en/processors/xeon/xeon-e3-1200-family-vol-2-datasheet.html
>> http://www.intel.com/content/www/us/en/processors/xeon/xeon-e3-1200v3-vol-2-datasheet.html
>>
>> I've tested this on bad memory hardware, and observed correlating bad reads
>> and uncorrected memory errors as reported by the driver.
>>
>> Signed-off-by: Jason Baron <jbaron@...mai.com>
>> ---
>>  drivers/edac/Kconfig        |   7 +
>>  drivers/edac/Makefile       |   1 +
>>  drivers/edac/ie31200_edac.c | 540 ++++++++++++++++++++++++++++++++++++++++++++
>>  3 files changed, 548 insertions(+)
>>  create mode 100644 drivers/edac/ie31200_edac.c
>>
>> diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
>> index 878f090..27f44a1 100644
>> --- a/drivers/edac/Kconfig
>> +++ b/drivers/edac/Kconfig
>> @@ -186,6 +186,13 @@ config EDAC_I3200
>>  	  Support for error detection and correction on the Intel
>>  	  3200 and 3210 server chipsets.
>>  
>> +config EDAC_IE31200
>> +	tristate "Intel e312xx"
>> +	depends on EDAC_MM_EDAC && PCI && X86
>> +	help
>> +	  Support for error detection and correction on the Intel
>> +	  E3-1200 processor.
>> +
>>  config EDAC_X38
>>  	tristate "Intel X38"
>>  	depends on EDAC_MM_EDAC && PCI && X86
>> diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile
>> index 4154ed6..c479a24 100644
>> --- a/drivers/edac/Makefile
>> +++ b/drivers/edac/Makefile
>> @@ -37,6 +37,7 @@ obj-$(CONFIG_EDAC_I82875P)		+= i82875p_edac.o
>>  obj-$(CONFIG_EDAC_I82975X)		+= i82975x_edac.o
>>  obj-$(CONFIG_EDAC_I3000)		+= i3000_edac.o
>>  obj-$(CONFIG_EDAC_I3200)		+= i3200_edac.o
>> +obj-$(CONFIG_EDAC_IE31200)		+= ie31200_edac.o
>>  obj-$(CONFIG_EDAC_X38)			+= x38_edac.o
>>  obj-$(CONFIG_EDAC_I82860)		+= i82860_edac.o
>>  obj-$(CONFIG_EDAC_R82600)		+= r82600_edac.o
>> diff --git a/drivers/edac/ie31200_edac.c b/drivers/edac/ie31200_edac.c
>> new file mode 100644
>> index 0000000..ae03d21
>> --- /dev/null
>> +++ b/drivers/edac/ie31200_edac.c
>> @@ -0,0 +1,540 @@
>> +/*
>> + * Intel E3-1200
>> + * Copyright (C) 2014 Jason Baron <jbaron@...mai.com>
>> + *
>> + * Support for the E3-1200 processor family. Heavily based on previous
>> + * Intel EDAC drivers.
> 
> Btw, remind me again why this isn't part of the sb_edac? AFAICT, the
> e3-12xx thing is a Sandybridge, right?
> 

So, I *think* that the E3-12xx processors cross microarchitectures.
So while E3-1270 is sandy bridge, the E3-1270 v3 is Haswell, and
the E3-1270 v2 is Ivy Bridge.

> Why not put it into sb_edac - it is small enough and if you're lucky,
> you might even share functionality?
> 

As far as I understand the sb_edac driver is decoding MCEs via a registration
function with the core MCE code.

However, we have a number of E3-12xx boxes, and we have not seen a MCE
generated on ue or ce errors.

Thanks,

-Jason




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