[openib-general] [discuss] Re: 2.6.19-rc4: known unfixed regressions (v3)

[Matthew Wilcox]

On Wed, Nov 08, 2006 at 12:57:03AM +0800, Jeff Chua wrote:
> 2) this fails ...
> 
> e0000000-efffffff : 0000:00:02.0
> f0000000-ffffffff : PCI MMCONFIG 0
>    fed00000-fed003ff : HPET 0

Heh, no kidding ...

                num_buses = pci_mmcfg_config[i].end_bus_number -
                    pci_mmcfg_config[i].start_bus_number + 1;
                res->start = pci_mmcfg_config[i].base_address;
                res->end = res->start + (num_buses << 20) - 1;
                res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
                insert_resource(&iomem_resource, res);

So if we have 256 busses assigned, then we request 256MB and, well,
there's no room for anyone else.  This code was added by Andi in commit
de09bddb9d6f96785be470c832b881e6d72d589f

Hopefully he'll have a good idea how to restrict it.  Given your "working"
resource map, it seems like it should be limited to 16MB (and thus 16 busses).
But how to figure that out?