linux-kernel - Re: [PATCH 1/3] EDAC/amd64: Print ECC enabled/disabled for nodes with enabled MCs

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Date:   Wed, 28 Mar 2018 17:43:49 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Ghannam, Yazen" <Yazen.Ghannam@....com>
Cc:     "linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] EDAC/amd64: Print ECC enabled/disabled for nodes
 with enabled MCs

On Wed, Mar 28, 2018 at 02:38:11PM +0000, Ghannam, Yazen wrote:
> In either of those cases we won't get to debug_display_dimm_sizes*
> because we won't initialize the instance.

So you move that code which accesses csrows up so that it has the
required information to query DIMM state/presence.

>                 /* Assume UMC MCA banks are enabled. */
>                 nb_mce_en = true;

Also, I don't like that assumption.

> This would work for Fam17h. For older systems I think we can look at
> D18F2x94_dct[1:0][DisDramInterface]
> 
> Or maybe we have a separate function to check for enabled memory controllers
> before we check for ECC?

The best would be to have a function which checks whether DIMMs are
present on the node and act accordingly. You can pull up some of the
work of caching registers which are used in debug_display_dimm_sizes*
and use that info to get the required DIMM state upfront.

Thx.

-- 
Regards/Gruss,
    Boris.

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