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

[Gordan Bobic <gordan@xxxxxxxxxx>]

On 12/13/2013 02:56 PM, Jan Beulich wrote:
> > > > 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.
Not sure about multiple intermediate PCI-PCI bridges, but I can confirm 
that multiuple intermediate PCIe bridge setup works fine,
e.g. Intel X58 -> Nvidia NF200 -> PLX -> GPU (GTX690)

Gordan


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