Re: [PATCH v2] PCI: Add information about describing PCI in ACPI

[Bjorn Helgaas]

On Tue, Dec 13, 2016 at 04:09:39AM -0500, Jon Masters wrote:
> On 11/29/2016 04:39 PM, Bjorn Helgaas wrote:
> 
> > +New architectures should be able to use "Consumer" Extended Address Space
> > +descriptors in the PNP0A03 device for bridge registers, including ECAM,
> > +although a strict interpretation of [6] might prohibit this.  Old x86 and
> > +ia64 kernels assume all address space descriptors, including "Consumer"
> > +Extended Address Space ones, are windows, so it would not be safe to
> > +describe bridge registers this way on those architectures.
> 
> <snip>
> 
> > +[6] PCI Firmware 3.0, sec 4.1.2:
> 
> <snip>
> 
> Thanks for the revised writeup, Bjorn. It's great. I'm trying to get the
> above clarified explicitly in terms of the spec, and in terms of what
> other Operating Systems would like to see as general preference.

Any feedback on this?  I'd like to post a revised version soon for v4.11.

Bjorn