[Xen-users] DVB tuner not working in PV guest

[Simon Hobson <linux@xxxxxxxxxxxxxxxx>]

I'm trying to setup a new home server, and part one is getting a new 
version of MythTV running. Host is Debian with Xen4.0.1 and kernel 
2.6.32-5-xen-amd64, PV guest is also Debian with kernel 
2.6.32-5-xen-amd64. I have a DVB-T tuner (HVR-1200, PCIe card) I am 
trying to use in the guest with pciback.hide etc. The whole thing is 
running on an HP Proliant Microserver I bought while HP had a mail-in 
rebate going.
If I boot the host without Xen, I can access the card with dvbtune 
and it lists the channels in a multiplex :
> # dvbtune -f 801833000 -i
> Using DVB card "NXP TDA10048HN DVB-T"
> tuning DVB-T (in United Kingdom) to 801833000 Hz
> polling....
> Getting frontend event
> FE_STATUS:
> polling....
> Getting frontend event
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
> Bit error rate: 35
> Signal strength: 65278
> SNR: 246
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
> <transponder type="T" freq="801833000">
> <service id="4168" ca="0">
> <description tag="0x48" type="1" provider_name="BBC" service_name="BBC ONE" />
> <descriptor tag="0x73" data="66702e6262632e636f2e756b" text="fp.bbc.co.uk" />
> <stream type="2" pid="101">
> <stream_id id="1" />
> </stream>
And the card shows up in the boot log :
> 02:00.0 Multimedia video controller: Conexant Systems, Inc. CX23885 
> PCI Video and Audio Decoder (rev 02)
I've hidden the card from Dom0 by adding "xen-pciback.hide=(02:00.0)" 
to the grub config.
When I boot the guest, I can see it's tuner card
> eddi kernel: [   25.348011] cx23885[0]/0: found at 0000:00:00.0, 
> rev: 2, irq: 16, latency: 0, mmio: 0xfe600000
But if I try to access it with dvbtune, it can't detect any channels :

> # dvbtune -f 801833000 -i
> Using DVB card "NXP TDA10048HN DVB-T"
> tuning DVB-T (in United Kingdom) to 801833000 Hz
> polling....
> Getting frontend event
> FE_STATUS:
> polling....
> Getting frontend event
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
> Bit error rate: 1965
> Signal strength: 61680
> SNR: 131
> FE_STATUS: FE_HAS_SIGNAL FE_HAS_LOCK FE_HAS_CARRIER FE_HAS_VITERBI FE_HAS_SYNC
> <transponder type="T" freq="801833000">
> Nothing to read from fd_pat
> Nothing to read from fd_sdt
> </transponder>
Now, that looks very much to me like it recognises there is a signal 
(HAS_SIGNAL, HAS_LOCK, and so on), but it cannot read any data.
Does anyone have any suggestions what may be missing here ?
Is the "mmio: 0xfe600000" significant, or does that get handled 
automatically with the pciback stuff ?
--
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.

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