Mailing List Archive: PCI device access and debugging output

PCI device access and debugging output

Jul 12, 2005, 12:47 PM

Post #1 of 3 (311 views)

Hello all. I've reached a problem I haven't found in the docs or on the
user's list. I have a Zapata Telephony FXO interface in a PCI card. I
would like an unprivleged domain to have access to it. I hid the device
from Domain 0 like so:
(without the line wrap)
kernel /boot/xen.gz dom0_mem=128000
physdev_dom0_hide='(00:06.0)'

Domain 0 forgot about it and I told vm 1 about the same device in its
configuration file:
pci = [ '00,06,00' ]

When I boot vm 1, I see this in the xend log:
[2005-07-12 14:44:52 xend] DEBUG (XendDomainInfo:1178) Creating pci
device dom=3 bus=0 dev=6 func=0

I built the device driver in Domain 0 against the kernel source for
xen-U and the driver loads and claims to see the card. But the
application I need to access it claims it can't open the device.

Before I go to the application developer (Asterisk, if you're
interested), I want to confirm that my xen-U domain really does know
about the device and the driver is being properly loaded. How would I do
this beyond the output I pasted above? Is there any way at all?

Thanks for any help you can offer.

--
Lee Azzarello
Network Engineer
Progressive Solutions
+1 212 937 8939

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Re: PCI device access and debugging output [ In reply to ]

mark.williamson at cl

Jul 14, 2005, 5:59 PM

Post #2 of 3 (306 views)

Permalink

> Domain 0 forgot about it

Good.

> When I boot vm 1, I see this in the xend log:
> [2005-07-12 14:44:52 xend] DEBUG (XendDomainInfo:1178) Creating pci
> device dom=3 bus=0 dev=6 func=0
Good.

> I built the device driver in Domain 0 against the kernel source for
> xen-U and the driver loads and claims to see the card. But the
> application I need to access it claims it can't open the device.

Interesting.

> Before I go to the application developer (Asterisk, if you're
> interested), I want to confirm that my xen-U domain really does know
> about the device and the driver is being properly loaded. How would I do
> this beyond the output I pasted above? Is there any way at all?

Check the dmesg output and see what it says - should have some blurb following
the point where you loaded the module.

Does the driver work in dom0 OK? Some DMA issues have been fixed in the
2.0-testing tree recently, so you might want to try that out.

Cheers,
Mark

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Re: PCI device access and debugging output [ In reply to ]

lee.azzarello at ps-solved

Jul 18, 2005, 6:28 AM

Post #3 of 3 (303 views)

Permalink

On Fri, 2005-07-15 at 01:59 +0100, Mark Williamson wrote:
>
> > I built the device driver in Domain 0 against the kernel source for
> > xen-U and the driver loads and claims to see the card. But the
> > application I need to access it claims it can't open the device.
>
> Interesting.
>
> > Before I go to the application developer (Asterisk, if you're
> > interested), I want to confirm that my xen-U domain really does know
> > about the device and the driver is being properly loaded. How would I do
> > this beyond the output I pasted above? Is there any way at all?
>
> Check the dmesg output and see what it says - should have some blurb following
> the point where you loaded the module.
>
> Does the driver work in dom0 OK? Some DMA issues have been fixed in the
> 2.0-testing tree recently, so you might want to try that out.

No. After some further testing, it turns out it was the application
developer's fault. I updated their latest driver from CVS and the card
was recognized on a non-xen system. I'll try it on the xen dom0 kernel
when I can get over to the box.

--
Lee Azzarello
Network Engineer
Progressive Solutions
+1 212 937 8939

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