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

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Message-ID: <20170201165013.GB13183@bhelgaas-glaptop.roam.corp.google.com>
Date:   Wed, 1 Feb 2017 10:50:13 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Jon Masters <jcm@...masters.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Gabriele Paoloni <gabriele.paoloni@...wei.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>, Duc Dang <dhdang@....com>,
        linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
        linux-acpi@...r.kernel.org,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Lv Zheng <lv.zheng@...el.com>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] PCI: Add information about describing PCI in ACPI

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