linux-kernel - Re: v2.6.26-rc9: ACPI PCI irq routing on NUMA? + early

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Message-ID: <Pine.LNX.4.55.0807181302020.12125@cliff.in.clinika.pl>
Date:	Fri, 18 Jul 2008 13:59:12 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Vegard Nossum <vegard.nossum@...il.com>
cc:	Bjorn Helgaas <bjorn.helgaas@...com>, Ingo Molnar <mingo@...e.hu>,
	Alexey Starikovskiy <astarikovskiy@...e.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	venkatesh.pallipadi@...el.com, Huang Ying <ying.huang@...el.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	linux-acpi@...r.kernel.org
Subject: Re: v2.6.26-rc9: ACPI PCI irq routing on NUMA? + early_ioremap
 trouble

On Fri, 18 Jul 2008, Vegard Nossum wrote:

> I have done this for the bad case:
> http://folk.uio.no/vegardno/linux/netconsole2.txt

 Thanks.  The MP table looks broken:

Bus #4 is ISA
I/O APIC #32 Version 32 at 0xFEC00000.
Int: type 3, pol 1, trig 1, bus 4, IRQ 00, APIC ID 2, APIC INT 00

etc. (notice the different I/O APIC IDs reported), so any changes to our
code are not at fault.  I suggest you ask your vendor to fix it up (did
they test it at all? -- it has no chance to work) or stick to ACPI (I can
see it has been automatically disabled for some reason).

 Anyway, the piece of I/O APIC code in question should not poke at the
local APIC, so I'll prepare a fix to make it check for the APIC ID being
-1.

> (I added a warning for certain APIC errors as well. Not that it adds
> much in this particular case, but I think it would be good to have in
> mainline anyway, to highlight these error cases in the future...)

 It might be useful indeed.

  Maciej
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