Re: [PATCH v11 04/60] sparc/PCI: Use correct offset for bus address to resource

[David Miller]

From: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Date: Wed, 04 May 2016 10:37:40 +1000

> On Tue, 2016-05-03 at 15:52 -0700, Yinghai Lu wrote:
>> BenH and DavidM,
>> Are you ok to let /proc/bus/pci/devices to expose resource value
>> instead of
>> BAR value?
>> powerpc already expose MMIO as resource value, but still keep IO as
>> BAR value?
>> 
>> Or can we just dump /proc/bus/pci support from now?
> 
> The problem tends to be old Xserver expectations...
> 
> That stuff has been a can of worms over the years and we did things in
> the kernel to work around X limitations. I'm not that keen on touching
> /proc at all in that regard. Leave it there do what it does today, it's
> a user visible ABI, don't change it.

I agree with Ben, whatever procfs is exporting in the past is what
the Xserver and other things expect on sparc64 and therefore is a
user facing ABI that can't be changed.