linux-kernel - Re: linux-next: Tree for June 13: IO APIC breakage on HP nx6325

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Message-ID: <20080621123822.GA27686@srcf.ucam.org>
Date:	Sat, 21 Jun 2008 13:38:22 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: linux-next: Tree for June 13: IO APIC breakage on HP nx6325

On Sat, Jun 21, 2008 at 03:41:37AM +0100, Maciej W. Rozycki wrote:

>  Maybe, though your code seems to match product IDs rather than the broken
> DSDT itself.  I think the latter would be preferable as it would cover all
> the pieces of equipment using the broken piece of firmware rather than
> ones we have already tracked down.  Perhaps the version could be included
> too, but that would only make sense if the breakage ever gets fixed -- the
> use of the through-8259A mode for the 8254 timer would allow this piece of
> equipment to benefit from the I/O APIC driven NMI watchdog.

I haven't seen any other machines with this issue, so I suspect that 
this is HP-specific code. I'll look into what would need doing to quirk 
it off the DSDT strings, though.

>  Not exactly.  The IRQ0->2 mapping is certainly wrong here, but so is the
> identity IRQ0->0 one.  Which means it should not be recorded in
> mp_config_acpi_legacy_irqs() at all.  I can cook this part if you'd rather
> not to, if you do the ACPI part.  If you think there is no easy way to
> match the DSDT rather than the product ID -- we are trying to cope with
> outright breakage here after all, so any amount of effort is too much ;)  
> -- I can update your proposal with what I have in mind.

Ok, that works for me.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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