Re: ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 11, why not in 9 ?

[Stian Jordet <liste@jordet.net>]

tor, 14,.09.2006 kl. 20.43 +0100, skrev Sergio Monteiro Basto:
> drivers/acpi/pci_link.c, line #583
> acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
>         printk(PREFIX "%s [%s] enabled at IRQ %d\n",
>                acpi_device_name(link->device),
>                acpi_device_bid(link->device), link->irq.active);
> 
> any clue about this problem ? 

I think you might be on to something here, but doesn't seem like anyone
with the right skills has anything to add :( But it seems obvious that
it's somewhat related to the fact that LNKD is enabled on irq11, even
though it seems like it should have been irq9. Weird, but I don't
understand nada :(

Thanks for looking into it, though.

-Stian


> -------- Forwarded Message --------
> From: Sergio Monteiro Basto 
> Subject: Re: [PATCH V3] VIA IRQ quirk behaviour change
> Date: Wed, 13 Sep 2006 01:48:28 +0100
> 
> On Tue, 2006-09-12 at 23:38 +0200, Stian Jordet wrote:
> > On tir, 2006-09-12 at 13:37 +0100, Sergio Monteiro Basto wrote:
> > > Ok, as a quick answer, you have a very primitive VIA SMP board, which
> > > make me remember my old laptop. 
> > > I maintain what a had write in previous emails about this system. 
> > > Seeing the configuration of irqs on windows, USB are in 9, so could be a
> > > clue.
> > > If I had your board, I'll try not quirk USB (cause quirk put USB in 11)
> > > and make USB interrupts work as IO-APIC-edge.
> > > 9:       nnnn       nnnn   IO-APIC-edge  uhci_hcd:usb1, uhci_hcd:usb2,
> > > uhci_hcd:usb3
> > 
> > The point is, that even when I do not quirk (just insert return at the
> > top of the quirk-function), usb still uses irq 11 (as I wrote here:
> > http://lkml.org/lkml/2006/9/6/49 ), but won't work. And acpi (on
> > interrupt 9) gets an interrupt storm, and gets disabled.
> > 
> 
> Good point , you got on your dmesg of kernel 2.6.18-rc6
> (http://lkml.org/lkml/2006/9/10/120)
> 
> USB Universal Host Controller Interface driver v3.0
> ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 11
> ACPI: PCI Interrupt 0000:00:11.2[D] -> Link [LNKD] -> GSI 11 (level, low) -> IRQ 11
> PCI: VIA IRQ fixup for 0000:00:11.2, from 9 to 11
> uhci_hcd 0000:00:11.2: UHCI Host Controller
> uhci_hcd 0000:00:11.2: new USB bus registered, assigned bus number 1
> uhci_hcd 0000:00:11.2: irq 11, io base 0x00009800
> usb usb1: configuration #1 chosen from 1 choice
> hub 1-0:1.0: USB hub found
> hub 1-0:1.0: 2 ports detected
> 
> but before 
> 
> ACPI: PCI Interrupt Link [LNKA] (IRQs 3 4 5 6 7 9 10 *11 12 14 15)
> ACPI: PCI Interrupt Link [LNKB] (IRQs 3 4 5 6 7 9 *10 11 12 14 15)
> ACPI: PCI Interrupt Link [LNKC] (IRQs 3 4 *5 6 7 9 10 11 12 14 15)
> ACPI: PCI Interrupt Link [LNKD] (IRQs 3 4 5 6 7 *9 10 11 12 14 15)
> 
> LNKD was on 9, so may be the bug is on ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 11
> you have to investigate :) 
> 
> Further more, your interrupts have 4 steps  
> ACPI: PCI Interrupt 0000:00:11.2[D] -> Link [LNKD] -> GSI 11 (level, low) -> IRQ 11
> and mine just got 3 
> ACPI: PCI Interrupt 0000:00:10.1[A] -> GSI 21 (level, low) -> IRQ 201
> 
> > But if I somehow got usb using irq 9, all my problems might vanish...
> > 
> > -Stian
> > 
> 
>