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[Xen-devel] pci adapter not working in dom0. works under plain Linux.

  • To: "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>
  • From: James Harper <james@xxxxxxxxxxxxxxxxx>
  • Date: Sun, 8 Jun 2014 11:01:25 +0000
  • Accept-language: en-AU, en-US
  • Delivery-date: Sun, 08 Jun 2014 11:45:08 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xen.org>
  • Thread-index: Ac+DCNWNPHJYbVrFQ8CYCy7O42ilYw==
  • Thread-topic: pci adapter not working in dom0. works under plain Linux.

I bought an unsupported DVB card (by mistake - I bought the v2 version instead 
of the supported v1 version), and I've just finished getting it working under 
Linux, but spent the last day or so trying to figure out why it keeps dropping 
buffers even though the reception is perfect. As soon as I noticed that the 
lost data is always in PAGE_SIZE multiples, I figured I'd better boot in plain 
Linux instead of Xen, and when I did that it worked perfectly.

The card is based on the cx23885 chipset, which is already supported (my work 
is just porting a different tuner/demod), so I suspect it's actually a bug in 
the existing cx23885 driver. I'm hoping there is just a flag missing or 
something when the adapter allocates buffers for DMA. Can anyone offer any 
suggestions as to what I'm looking for before I dive in?



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