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Message-ID: <YoZXb44DCGDMYqtg@yaz-fattaah>
Date: Thu, 19 May 2022 14:42:55 +0000
From: Yazen Ghannam <yazen.ghannam@....com>
To: Borislav Petkov <bp@...en8.de>
Cc: linux-edac@...r.kernel.org, linux-kernel@...r.kernel.org,
Smita.KoralahalliChannabasappa@....com, muralidhara.mk@....com,
naveenkrishna.chatradhi@....com
Subject: Re: [PATCH 06/18] EDAC/amd64: Add prep_chip_selects() into pvt->ops
On Wed, May 18, 2022 at 10:10:05AM +0200, Borislav Petkov wrote:
> On Mon, May 09, 2022 at 02:55:22PM +0000, Yazen Ghannam wrote:
> > From: Muralidhara M K <muralidhara.mk@....com>
> >
> > GPU Nodes will need to set the number of available Chip Selects, i.e.
> > Base and Mask values, differently than existing systems. A function
> > pointer should be used rather than introduce another branching condition.
>
> Yeah, it looks to me like all that detection logic should be split
> eventually. Looking at read_mc_regs(), it has
>
> if (pvt->umc) {
> __read_mc_regs_df(pvt);
>
> goto skip;
> }
>
> at the top, then a whole bunch of legacy stuff and then at the skip
> label some common stuff...
>
> Another thing you could consider is to have common functionality carved
> out into helpers with "common" in the name and then call those from both
> UMC and DCT paths. Perhaps that'll help keep the init paths sane. That
> is, short of splitting this driver.
>
> We did the splitting for Intel and there we have a common, librarized
> code which gets linked into a couple of drivers. You don't have to do
> this too - just putting it out there as an alternative.
>
> The per-family function pointers design could be good too, if done
> right. The advantage being, you have a single driver for all, yadda
> yadda...
>
Yep, I've actually considered splitting this driver. But I think at this point
it'd be best to keep what we have, and then write a new driver if and when a
major change happens in future platforms.
> > Prepare for this by adding prep_chip_selects() to pvt->ops and set it
> > as needed based on currently supported systems.
> >
> > Use a "umc" prefix for modern systems, since these use Unified Memory
> > Controllers (UMCs).
> >
> > Use a "dct" prefix for newly-defined legacy functions, since these
> > systems use DRAM Controllers (DCTs).
> >
> > Signed-off-by: Muralidhara M K <muralidhara.mk@....com>
> > Signed-off-by: Naveen Krishna Chatradhi <naveenkrishna.chatradhi@....com>
>
> What does Naveen's SOB mean here? Co-developed-by perhaps?
>
Yes, that's right. Sorry I missed it. I'll include it in the next revision.
Thanks,
Yazen
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