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

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Date:	Fri, 10 Jul 2009 15:17:53 +0800
From:	Feng Tang <feng.tang@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
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

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.

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?

Thanks,
Feng 
 
> 	Ingo
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