linux-kernel - Re: [PATCH RFC 1/2] drivers/edac: Add L1 and L2 error detection for A53 and A57

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Message-ID: <20180315101725.GC27816@pd.tnic>
Date:   Thu, 15 Mar 2018 11:17:25 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     York Sun <york.sun@....com>
Cc:     "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        James Morse <james.morse@....com>
Subject: Re: [PATCH RFC 1/2] drivers/edac: Add L1 and L2 error detection for
 A53 and A57

On Thu, Mar 15, 2018 at 01:20:18AM +0000, York Sun wrote:
> The discussion led to using device tree to specify which cores have this
> feature. Since this feature is "implementation dependent", I can only
> confirm it is available on A53 core, and partially on A57 core (lacking
> error injection). It is not generic to ARM64 cores.

So my ARM person is telling me A53 is little and A57 is big.

In any case, I'd like to have a sane collection of RAS functionality,
either per uarch or per vendor. So I can imagine having edac_a53,
edac_a57, etc.

But not per functional unit. Especially if the functionality is shared
between core designs.

In that case, we'll have to do something like fsl_ddr_edac being shared
between MPC85xx and layerscape.

> We can leave this patch floating. If someone else finds it useful, we
> can resume the discussion on how to generalize it.

Yes. If you want to do a nxp_edac or so which supports your hardware,
that's fine. And then have the different functional units get built into
a final edac driver, that's fine with me too. Other drivers will reuse
those functional units since they're stock and should adhere to the
design...

Thx.

-- 
Regards/Gruss,
    Boris.

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