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Re: [Qemu-devel] Re: AHCI support integration

From: Christoph Egger
Subject: Re: [Qemu-devel] Re: AHCI support integration
Date: Mon, 10 May 2010 10:12:32 +0200
User-agent: KMail/1.9.10

On Sunday 09 May 2010 21:11:17 Alexander Graf wrote:
> Sebastian Herbszt wrote:
> > The ICH6 AHCI implementation submitted by Chong is an all-in-one
> > attempt (ahci.c).
> > It includes all needed parts of the ICH6, AHCI, SATA and ATA
> > specification.
> > The code in hw/ide/* on the other hand is split (or could be split)
> > into smaller parts like
> > port based and bus master access, IDE and ATA core.
> > I think it might be reasonable to split ahci.c into ICH6, AHCI and
> > SATA parts and strip the
> > limited ATA support and reuse it from the ide core.
> > This would give us something like the following:
> >
> > hw/ide/piix.c (PIIX3 and PIIX4)
> > hw/ide/pci.c and core.c (IDE, BM)
> > hw/ata-core.c (ATA)
> > hw/sata/ich6.c (ICH6)
> > hw/sata-core.c (SATA)
> > hw/ahci-core.c (AHCI)
> >
> > Should this be a goal or am i over-engineering here?
> [CC'ing Tejun - he volunteered to help out on this topic as well]
> I think there's no need to split sata and ahci.
> Apart from that, I think we should take things incrementally. For now
> there's no need to split IDE further until we hit a technical limit. I
> have yet to see a patch trying to reuse the IDE command processing, so
> depending on how the respective person implements that, I'm open to
> suggenstions.
> So as far as I'm concerned, I'd prefer to model things after they're
> developed. That way we know the pitfalls.

You missed Sebastians point. His question is related to software design.


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