linux-kernel - Re: sharing interrupt between PCI device

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Date:	Mon, 10 Nov 2008 12:05:59 +0530
From:	"Nobin Mathew" <nobin.mathew@...il.com>
To:	"Grant Grundler" <grundler@...isc-linux.org>
Cc:	"Jiri Slaby" <jirislaby@...il.com>, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, "Robert Hancock" <hancockr@...w.ca>
Subject: Re: sharing interrupt between PCI device

lspci output

[root@...alhost ~]# lspci -vs 1:4
01:04.0 System peripheral: Compaq Computer Corporation Integrated
Lights Out Controller (rev 03)
        Subsystem: Hewlett-Packard Company Unknown device 3305
        Flags: medium devsel, IRQ 11
        I/O ports at 2800 [size=256]
        Memory at fdee0000 (32-bit, non-prefetchable) [size=512]
        Capabilities: [f0] Power Management version 3

01:04.2 System peripheral: Compaq Computer Corporation Integrated
Lights Out  Processor (rev 03)
        Subsystem: Hewlett-Packard Company Unknown device 3305
        Flags: medium devsel, IRQ 225
        BIST result: 00
        I/O ports at 1400 [disabled] [size=256]
        Memory at fded0000 (32-bit, non-prefetchable) [disabled] [size=2K]
        Memory at fdec0000 (32-bit, non-prefetchable) [disabled] [size=8K]
        Memory at fde00000 (32-bit, non-prefetchable) [disabled] [size=512K]
        [virtual] Expansion ROM at fdd20000 [disabled] [size=64K]
        Capabilities: [f0] Power Management version 3

01:04.4 USB Controller: Hewlett-Packard Company Proliant iLO2 virtual
USB controller (prog-if 00 [UHCI])
        Subsystem: Hewlett-Packard Company Unknown device 3305
        Flags: medium devsel, IRQ 225
        I/O ports at 1800 [disabled] [size=32]
        Capabilities: [f0] Power Management version 3

01:04.6 IPMI SMIC interface: Hewlett-Packard Company Proliant iLO2
virtual UART (prog-if 01)
        Subsystem: Hewlett-Packard Company Unknown device 3305
        Flags: medium devsel, IRQ 50
        Memory at fddf0000 (32-bit, non-prefetchable) [size=256]
        Capabilities: [f0] Power Management version 3

dmesg messages and /proc/interupts are attached.


command sequence just for reference

insmod hpilo
insmod uhci_hcd
cat /proc/interrupts
dmesg
rmmod hpilo
rmmod uhci_hcd
dmesg

Thanks
Nobin Mathew

On Sun, Nov 9, 2008 at 12:45 AM, Grant Grundler
<grundler@...isc-linux.org> wrote:
> On Sat, Nov 08, 2008 at 08:10:54PM +0100, Jiri Slaby wrote:
>> Grant Grundler napsal(a):
>> > So I see how the IRQ is enabled and disabled. I still don't see where
>> > an interrupt handler is bound to IRQ 225 (output you posted today in
>> > another email).
>>
>> This irq setup is done during pci_enable_device.
>
> Sorry, I wasn't quite correct: pci_enable_device() should only assign IRQs,
> not enable them. request_irq() would enable them.
>
>> > Nobin, can you dump /proc/interrupts when both drivers
>> > are loaded and also send the dmesg output after both are loaded?
>>
>> This won't show the hp driver as it doesn't request_irq.
>
> Yup - that's what I expect too. But I was afraid something else might
> be calling request_irq() and I'm just not seeing it. :)
>
> grant
>

View attachment "demsg_all_in" of type "text/plain" (2925 bytes)

View attachment "interrupts_out" of type "text/plain" (799 bytes)

View attachment "demsg_all_out" of type "text/plain" (3918 bytes)