pci: Arch hook to determine config space size

[Brian King]

Matthew Wilcox wrote:
> Basically, ppc64's config ops are broken and need to check the offset
> being read.  Here's i386:
> 
> static int pci_conf1_write (int seg, int bus, int devfn, int reg, int len, u32 v
> alue)
> {
>         unsigned long flags;
> 
>         if ((bus > 255) || (devfn > 255) || (reg > 255)) 
>                 return -EINVAL;

Here is a pure ppc64 implementation that does this.

> 
> I think all the config ops in ppc64 are broken and need to check for these
> limits.  Also, it does some checks that are already performed by upper layers:
> 
>         if (where & (size - 1))
>                 return PCIBIOS_BAD_REGISTER_NUMBER;
> 
> is checked for in drivers/pci/access.c

I can submit a separate patch to clean that up.

-- 
Brian King
eServer Storage I/O
IBM Linux Technology Center
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