linux-kernel - Re: [PATCH 11/12] SFI, PCI: Hook MMCONFIG

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Date:	Fri, 10 Jul 2009 13:14:57 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Feng Tang <feng.tang@...el.com>
Cc:	Len Brown <lenb@...nel.org>, "x86@...nel.org" <x86@...nel.org>,
	"sfi-devel@...plefirmware.org" <sfi-devel@...plefirmware.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH 11/12] SFI, PCI: Hook MMCONFIG


* Feng Tang <feng.tang@...el.com> wrote:

> On Fri, 10 Jul 2009 13:52:29 +0800
> Ingo Molnar <mingo@...e.hu> wrote:
> 
> > 
> > > @@ -606,7 +607,9 @@ static void __init __pci_mmcfg_init(int early)
> > >  	}
> > >  
> > >  	if (!known_bridge)
> > > -		acpi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg);
> > > +		if (acpi_table_parse(ACPI_SIG_MCFG,
> > > pci_parse_mcfg))
> > > +			sfi_acpi_table_parse(ACPI_SIG_MCFG, NULL,
> > > NULL, 0,
> > > +				pci_parse_mcfg);
> > 
> > Please introduce one common/generic helper:
> > 
> > 		x86_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg);
> > 
> > and do the fallback in that helper. We generally want to try 
> > ACPI first, SFI second. That helper makes it easier to add such 
> > fallback in other places as well, and will de-uglify the above 
> > code as well.
> 
> Should we have a new acpi_sfi.c or .h to contain all these helper 
> functions? I think it is not appropriate to put it to either ACPI 
> or SFI code.

They are of the same family and there's reuse in terms of table 
parsing code, etc. Do you have some nice name that covers both? I 
didnt find any good one beyond the x86_table_*() namespace.

> Also, ACPI and SFI code under arch/x86/kernel have lots of similar 
> code in cpu/io-apic parsing, we thought about extracting these 
> sharable codes out and move them to apic.c/io_apic.c, but don't 
> know if this will uglify current apic/ioapic code? how do you 
> think about it?

it all depends on the patches ... and the APIC enumeration code 
definitely needs cleanups so if you can do it that would be welcome.

	Ingo
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