Re: [PATCH] PPC: PCI: Fix pcibios_io_space_offset() so it works for 32-bit ptr/64-bit rsrcs

On Fri, 2012-06-08 at 14:38 -0400, Ben Collins wrote:

quoted

quoted

pci_bus 0000:00: root bus resource [io  0xffbeb000-0xffbfafff] (bus
address [0x100000000-0x10000ffff])

I only have one PCIe RAID card on the bare metal system. Not
surprising I never noticed the problem on it directly.

Can you show me the device-tree node for that PCI host bridge ?

It's a p4080ds, so it's in arch/powerpc/boot/

And that means that this bug affects a real hardware platform, so I
think it makes it more valid to include it. The only reason it didn't
affect me directly is because my only PCIe card doesn't have io, just
mem BARs. 

Something doesn't make sense. The bus address printed above are clearly
not right, the .dts contains for the "ranges" entries for IO space of
all 3 bridges:

  0x01000000 0 0x00000000 0xf 0xf8000000 0x0 0x00010000
  0x01000000 0 0x00000000 0xf 0xf8010000 0x0 0x00010000
  0x01000000 0 0x00000000 0xf 0xf8020000 0x0 0x00010000

So something is wrong with the printing of the bus address, there's a
stale top bit (overflow from the 64-bit substraction somewhere ?)

Cheers,
Ben.