linux-kernel - Re: PCI Interrupt

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Message-ID: <Pine.LNX.4.61.0709180955360.6632@chaos.analogic.com>
Date:	Tue, 18 Sep 2007 09:57:57 -0400
From:	"linux-os \(Dick Johnson\)" <linux-os@...logic.com>
To:	<Duncan.Perrett@...kta.com>
Cc:	"Linux kernel" <linux-kernel@...r.kernel.org>
Subject: Re: PCI Interrupt

On Tue, 18 Sep 2007 Duncan.Perrett@...kta.com wrote:

>
> I have a CAN PCI card installed on my Ubuntu box.
> I understand that PCI interrupts should be level rather than edge
> triggered.
>
> The output of cat /proc/interrupts is :-
>
>           CPU0
>  0:    1614601    IO-APIC-edge  timer
>  1:        164    IO-APIC-edge  i8042
>  8:          3    IO-APIC-edge  rtc
>  9:          1   IO-APIC-level  acpi
> 12:          0    IO-APIC-edge  CAN-ACx-PCI_01
> 14:      65786    IO-APIC-edge  ide0
> 169:       3220   IO-APIC-level  eth0, i915@pci:0000:00:02.0
> 177:      46459   IO-APIC-level  eth1
> 209:          0   IO-APIC-level  uhci_hcd:usb3, eth2
> 217:          2   IO-APIC-level  uhci_hcd:usb1, ehci_hcd:usb4
> 225:        697   IO-APIC-level  uhci_hcd:usb2
> NMI:          0
> LOC:    1614399
> ERR:          0
> MIS:          0
>
> You see that irq 12 CAN-ACx-PCI_01 is edge triggered.
> Is there any way of forcing the BIOS to see the interrupt as a
> level-triggered one?

It's done in the driver. IRQ12 can be shared, so the driver
needs to request the IRQ as a shared interrupt.

Cheers,
Dick Johnson
Penguin : Linux version 2.6.22.1 on an i686 machine (5588.30 BogoMips).
My book : http://www.AbominableFirebug.com/
_

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