irqmask doesn't work

irqmask doesn't work

[Jing Xu]

Hello, 

I'm having some trouble with PCI IRQ's and I was
hoping someone here could help. 

I'm running linux 2.4.20 and rtai 24.1.11. My linux
kernel module needs to use IRQ 9 10 11 for AGP graphic
card, sound card and PCI-Dio24 IO card. These irqs are
also shared by USB controllers. My module hangs when
it tries to request the above irqs used by USB
devices. I figured it would be a good idea to remove
this apparent conflict. I have scoured the web and
found that I can reserve these IRQs by specifying
pci=irqmask=0xxxxx on the kernel boot line.

I have tried to set "pci=irqmask=0xf1e8" to reserve
Irq 9 10 11 4 from my driver, and it hasn't had any
effect - those irqs are still used by usb controllers
on initialization. 

How do I change these IRQ's?  Is there some other
configuration file I haven't found? If anyone can
provide any insight into this, I would appreciate it
greatly. Let me know what/if any details you need - I
am by no means an expert in this area and didn't want
to post reams of irrelevant information, but if there
is something I'm missing let me know and I'll get
it...

Thanks in advance,

jing 

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Re: irqmask doesn't work

[Art Wildman]

Try 'man sysctl'
http://www.redhat.com/docs/manuals/linux/RHL-7.3-Manual/ref-guide/s1-proc-sysctl.html

Sometimes it is more difficult to juggle these things in software than to make 
sure the machine is doing PnP properly. USB is a 'WinTel' standard & broken on 
many older motherboards. Check your BIOS for updates and settings to make sure 
Plug-n-Play is enabled, legacy IRQs are not reserved. Sometimes moving a card 
from one PCI slot to another enables PnP to overcome conficts, in redhat 'kudzu' 
should detect changes. -Art@JAX

Jing Xu wrote:

> Hello, 
> 
> I'm having some trouble with PCI IRQ's and I was
> hoping someone here could help. 
> 
> I'm running linux 2.4.20 and rtai 24.1.11. My linux
> kernel module needs to use IRQ 9 10 11 for AGP graphic
> card, sound card and PCI-Dio24 IO card. These irqs are
> also shared by USB controllers. My module hangs when
> it tries to request the above irqs used by USB
> devices. I figured it would be a good idea to remove
> this apparent conflict. I have scoured the web and
> found that I can reserve these IRQs by specifying
> pci=irqmask=0xxxxx on the kernel boot line.
> 
> I have tried to set "pci=irqmask=0xf1e8" to reserve
> Irq 9 10 11 4 from my driver, and it hasn't had any
> effect - those irqs are still used by usb controllers
> on initialization. 
> 
> How do I change these IRQ's?  Is there some other
> configuration file I haven't found? If anyone can
> provide any insight into this, I would appreciate it
> greatly. Let me know what/if any details you need - I
> am by no means an expert in this area and didn't want
> to post reams of irrelevant information, but if there
> is something I'm missing let me know and I'll get
> it...
> 
> Thanks in advance,
> 
> jing