On Fri, Jun 11, 2010 at 2:49 PM, Bjorn Helgaas <bjorn.helgaas@hp.com> wrote:
quoted text
> [If you haven't been following this bug, the report is at [3].]
>
> Here's a theory.  I'm not an expert in HyperTransport, so maybe somebody
> who knows HyperTransport and/or VIA chipsets can validate or refute it.
>
> This is based on the _HyperTransport I/O Link Specification_, rev 3.10b [1],
> and the _BIOS and Kernel Developer's Guide (BKDG) for AMD Family 10h
> Processors_ [2].
>
> In a nutshell, I think the problem is that amd_bus.c treats a
> HyperTransport (HT) host bridge as though it were a PCI host bridge.  In
> particular, when an HT chain contains more than one PCI host bridge, the
> HT host bridge apertures encompass all the PCI host bridges, but
> amd_bus.c mistakenly assigns all those resources to one PCI host bridge.

I don't think so. that system only have one HT chain.

May 19 23:20:33 ocham kernel: pci 0000:00:18.1 config space:
May 19 23:20:33 ocham kernel: 00: 22 10 01 11 00 00 00 00 00 00 00 06
00 00 80 00
May 19 23:20:33 ocham kernel: 10: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: 20: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: 30: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: 40: 03 00 00 00 00 00 7f 00 00 00 00 00
01 00 00 00
May 19 23:20:33 ocham kernel: 50: 00 00 00 00 02 00 00 00 00 00 00 00
03 00 00 00
May 19 23:20:33 ocham kernel: 60: 00 00 00 00 04 00 00 00 00 00 00 00
05 00 00 00
May 19 23:20:33 ocham kernel: 70: 00 00 00 00 06 00 00 00 00 00 00 00
07 00 00 00
May 19 23:20:33 ocham kernel: 80: 03 00 e0 00 80 ff ef 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: 90: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: a0: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: b0: 03 0a 00 00 00 0b 00 00 03 00 80 00
00 ff ff 00
May 19 23:20:33 ocham kernel: c0: 13 10 00 00 00 f0 ff 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: d0: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: e0: 03 00 00 ff 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: f0: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00

the (0xe4) =  ff 00 00 03

mean it will route pci operation all to node0 link0.

that chip from VIA has some design problem that will produce one orphan device.

May 19 23:20:33 ocham kernel: pci 0000:80:01.0 config space:
May 19 23:20:33 ocham kernel: 00: 06 11 88 32 06 00 10 00 10 00 03 04
10 00 00 00
May 19 23:20:33 ocham kernel: 10: 04 c0 bf fe 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: 20: 00 00 00 00 00 00 00 00 00 00 00 00
49 18 88 08
May 19 23:20:33 ocham kernel: 30: 00 00 00 00 50 00 00 00 00 00 00 00
0b 01 00 00
May 19 23:20:33 ocham kernel: 40: 00 30 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: 50: 01 60 42 c8 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: 60: 05 70 80 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: 70: 10 00 91 00 00 00 00 00 00 00 30 00
00 00 00 00
May 19 23:20:33 ocham kernel: 80: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: 90: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: a0: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: b0: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: c0: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: d0: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: e0: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00
May 19 23:20:33 ocham kernel: f0: 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00

YH
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