Re: [Xen-devel] Multi-bridged PCIe devices (Was: Re: iommuu/vt-d issues with LSI MegaSAS (PERC5i))

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.12.13 at 15:43, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> wrote:
> -[0000:00]-+-00.0  Intel Corporation 4th Gen Core Processor DRAM Controller
>            +-01.0-[01]--+-00.0  Intel Corporation 82571EB Gigabit Ethernet 
> Controller
>            |            \-00.1  Intel Corporation 82571EB Gigabit Ethernet 
> Controller
>            +-01.1-[02]----00.0  LSI Logic / Symbios Logic SAS2008 PCI-Express 
> Fusion-MPT SAS-2 [Falcon]
>            +-02.0  Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor 
> Integrated Graphics Controller
>            +-03.0  Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor 
> HD Audio Controller
>            +-14.0  Intel Corporation 8 Series/C220 Series Chipset Family USB 
> xHCI
>            +-16.0  Intel Corporation 8 Series/C220 Series Chipset Family MEI 
> Controller #1
>            +-16.3  Intel Corporation 8 Series/C220 Series Chipset Family KT 
> Controller
>            +-19.0  Intel Corporation Ethernet Connection I217-LM
>            +-1a.0  Intel Corporation 8 Series/C220 Series Chipset Family USB 
> EHCI #2
>            +-1b.0  Intel Corporation 8 Series/C220 Series Chipset High 
> Definition Audio Controller
>            +-1c.0-[03]----00.0  Intel Corporation 82574L Gigabit Network 
> Connection
>            +-1c.1-[04]----00.0  Intel Corporation 82574L Gigabit Network 
> Connection
>            +-1c.3-[05]----00.0  Intel Corporation I210 Gigabit Network 
> Connection
>            +-1c.4-[06]----00.0  Intel Corporation 82572EI Gigabit Ethernet 
> Controller (Copper)
>            +-1c.5-[07-09]----00.0-[08-09]--+-01.0-[09]--+-08.0  Brooktree 
> Corporation Bt878 Video Capture
>            |                               |            +-08.1  Brooktree 
> Corporation Bt878 Audio Capture
>            |                               |            +-09.0  Brooktree 
> Corporation Bt878 Video Capture
>            |                               |            +-09.1  Brooktree 
> Corporation Bt878 Audio Capture
>            |                               |            +-0a.0  Brooktree 
> Corporation Bt878 Video Capture
>            |                               |            +-0a.1  Brooktree 
> Corporation Bt878 Audio Capture
>            |                               |            +-0b.0  Brooktree 
> Corporation Bt878 Video Capture
>            |                               |            \-0b.1  Brooktree 
> Corporation Bt878 Audio Capture

So 00:1c.5 is the PCIe->PCI bridge, 07:00.0 and 08:01.0 are
PCI-PCI bridges, the capture devices are ordinary ones. The only
possibly unexpected aspect I can see here is that there are two
intermediate PCI-PCI bridges, but iirc this should be handled by
the VT-d code. You'd therefore mainly want to look at
find_upstream_bridge() getting things wrong, or
pseg->bus2bridge[] not getting set up correctly.

Jan


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