linux-kernel - Re: [PATCH] EDAC: Add AMD Seattle SoC EDAC

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Date:	Tue, 20 Oct 2015 18:41:45 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Brijesh Singh <brijeshkumar.singh@....com>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org,
	linux-edac@...r.kernel.org, robh+dt@...nel.org, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	dougthompson@...ssion.com, mchehab@....samsung.com,
	linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org
Subject: Re: [PATCH] EDAC: Add AMD Seattle SoC EDAC

On Tue, Oct 20, 2015 at 07:36:39PM +0200, Borislav Petkov wrote:
> On Tue, Oct 20, 2015 at 06:26:55PM +0100, Mark Rutland wrote:
> > > Btw, how much of this is implementing generic A57 functionality?
> > 
> > The driver is entirely A57 generic.
> > 
> > > If a lot, can we make this a generic a57_edac driver so that multiple
> > > vendors can use it?
> > 
> > Yes.
> 
> Ok, cool.
> 
> > > How fast and how ugly can something like that become?
> > 
> > Not sure I follow.
> 
> In the sense that some vendor might require just a little bit different
> handling or maybe wants to read some vendor-specific registers in
> addition to the architectural ones.
> 
> Then we'll start adding vendor-specific hacks to that generic driver.
> And therefore the question how fast and how ugly such hacks would
> become.
> 
> I guess we'll worry about that when we get there...
> 
> So Brijesh, if you only need generic, architectural functionality,
> please call it arm64_edac or so and let's add it so that other arm64
> vendors can use it too.

Please note that this is specific to Cortex-A57, not ARMv8 or aarch64.

It is an IMPLEMENTATION DEFINED feature as implemented by Cortex-A57,
which by definition is not implemented by other CPUs. It is not provided
by the ARM architecture.

So this cannot be arm64_edac, but could potentially be cortex_a57_edac.

Thanks,
Mark.
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