linux-kernel - Re: sharing interrupt between PCI device

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Message-ID: <8d6898730811092247u2d376f60u6bb74dd40fe81326@mail.gmail.com>
Date:	Mon, 10 Nov 2008 12:17:10 +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

Version of the running kernel 2.6.18-92.el5.

Thanks

On Mon, Nov 10, 2008 at 12:09 PM, Nobin Mathew <nobin.mathew@...il.com> wrote:
> lspci -vs 1:4 is taken before inserting the drivers.
>
> Thanks
>
> On Mon, Nov 10, 2008 at 12:05 PM, Nobin Mathew <nobin.mathew@...il.com> wrote:
>> 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
>>>
>>
>
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