Re: [Xen-devel] HVR-4000 DVB can't scan or tune (properly) with Xen

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Sun, Nov 13, 2011 at 06:47:14PM +0000, jonathanjstevens@xxxxxxxxx wrote:
> I've come across and issue and I think it may be Xen related. Hoping
> you can help.
> 
> I'm trying to use a couple of HVR-4000 with my Xen server.
> 
> I'm running Fedora 16:
> 
> Linux mythtvtuner.home 3.1.0-7.fc16.x86_64 #1 SMP Tue Nov 1 21:10:48
> UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
> 
> and the current packaged Xen is:
> 
> (XEN) Xen version 4.1.2 (mockbuild@xxxxxxxxxxxxxxxxxxxxxx) (gcc
> version 4.6.1 20111003 (Red Hat 4.6.1-10) (GCC) ) Fri Oct 21 21:56:01
> UTC 2011

Excellent. Everything that is new.

> 
> When I boot without Xen the DVB PCI cards can tune and scan perfectly.
> I also have a USB DVB unit, which can tune and scan regardless of
> whether Xen is running. However when I try to scan and tune with the
> PCI DVB cards it fails.

OK, and you are _not_ passing it to a guest right?

> 
> >From what I can tell the symptoms are exactly the same as in:
> 
> http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1786
> 
> I get the same "filter timeout" messages, and I also see similar
> messages in dmesg
> 
> [   26.572693] cx88[1]/1: IRQ loop detected, disabling interrupts
> [   26.574810] cx88[1]: irq aud [0x1001] dn_risci1* dn_sync*

Great. Can you do a couple of tests:

1). Boot your Linux machine with 'mem=3G' and see if that makes the issue
    disappear.

2). Tell me what is the 'scan' tool you use? Is it there a command
   line version of the tool that triggers this?

3). Or does this happend when you just load the module and it starts
   doing the IRQ loop detected' thingy?

> 
> I'm running a higher kernel than in the bug resolution though.
> 
> Any help appreciated!
> 
> Regards,
> Jon
> 
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