linux-kernel - Re: [RFC PATCH] edac: add support for ARM PL310 L2 cache parity

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Message-ID: <CAHLkNHJTA5bGD1zAfzE2JrDFAWvmgYyYjir+4vR-d9Fe2-E48g@mail.gmail.com>
Date:	Wed, 9 Apr 2014 22:59:49 +0530
From:	Punnaiah Choudary <kpc528@...il.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Rob Herring <robherring2@...il.com>,
	Punnaiah Choudary Kalluri 
	<punnaiah.choudary.kalluri@...inx.com>,
	Doug Thompson <dougthompson@...ssion.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-edac@...r.kernel.org, Michal Simek <michal.simek@...inx.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>,
	punnaiah choudary kalluri <kalluripunnaiahchoudary@...il.com>,
	punnaiah choudary kalluri <punnaia@...inx.com>
Subject: Re: [RFC PATCH] edac: add support for ARM PL310 L2 cache parity

There is a driver file cache-l2x0.c under arch/arm/mm for pl310 cache
configuration and management. Russel king had suggested to use
single driver file for both pl310 edac implementation and cache-l2x0.c
Here is the thread
http://www.spinics.net/lists/arm-kernel/msg320407.html

please provide your inputs

Thanks,
Punnaiah

On Wed, Apr 9, 2014 at 8:49 PM, Borislav Petkov <bp@...en8.de> wrote:
> On Wed, Apr 09, 2014 at 08:18:28AM -0500, Rob Herring wrote:
>> I don't think so, the PL310 is present on lots of ARM chips besides
>> Xilinx. I don't know how many support parity as that is optional. In
>> fact the highbank_l2_edac.c is for the PL310 as well, but the
>> registers it uses is all custom logic added for ECC and there is no
>> part of the PL310 h/w used by the driver.
>
> Oh ok, so highbank_l2 and PL310 could theoretically be merged together
> in one compilation unit, even if they don't really share code at all...
>
>> If there is lots duplication, then that's a sign the framework needs
>> to handle more of the boilerplate pieces. There could be a "simple"
>> driver/library for devices which are no more than some registers, an
>> interrupt handler and static information about the type of EDAC
>> device.
>
> Yeah, it's not that - I'm just getting worried that I'm receiving an
> EDAC driver for each piece of silicon out there and would like to still
> keep drivers/edac/ sane and be able to control that wild growth.
>
> I'm just thinking out loud here, bear with me pls:
>
> Frankly, having a single compilation unit contain similar silicon
> functionality could be a good way to put a hold on the growth but the
> disadvantage of this is fatter drivers. Which wouldn't matter all too
> much but after a certain level of fat, they might need splitting.
>
> And the highbank version is nothing but the big probe routine and a
> small irq handler.
>
> And the PL310 is similar but also with a poller.
>
> I guess, if they don't share functionality at all, putting them together
> might not be worth it. Hohummm.
>
> Thanks.
>
> --
> Regards/Gruss,
>     Boris.
>
> Sent from a fat crate under my desk. Formatting is fine.
> --
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