linux-kernel - Re: [PATCHv2] PCI: QDF2432 32 bit config space accessors

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Date:   Thu, 1 Dec 2016 23:58:52 -0500
From:   Jon Masters <jcm@...hat.com>
To:     Bjorn Helgaas <helgaas@...nel.org>,
        Sinan Kaya <okaya@...eaurora.org>
Cc:     cov@...eaurora.org, Tomasz Nowicki <tn@...ihalf.com>,
        will.deacon@....com, catalin.marinas@....com, rafael@...nel.org,
        Lorenzo.Pieralisi@....com, arnd@...db.de, hanjun.guo@...aro.org,
        jchandra@...adcom.com, dhdang@....com, ard.biesheuvel@...aro.org,
        robert.richter@...iumnetworks.com, mw@...ihalf.com,
        Liviu.Dudau@....com, ddaney@...iumnetworks.com,
        wangyijing@...wei.com, msalter@...hat.com,
        linux-pci@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linaro-acpi@...ts.linaro.org, andrea.gallo@...aro.org,
        jeremy.linton@....com, liudongdong3@...wei.com,
        gabriele.paoloni@...wei.com, jhugo@...eaurora.org,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] PCI: QDF2432 32 bit config space accessors

On 11/03/2016 10:00 AM, Bjorn Helgaas wrote:

> It turns out that we can't use the _CRS of host bridges because of the
> Producer/Consumer bit screwup [1].  So the fallback is to include the
> ECAM space in the _CRS of a PNP0C02 device.  This is what the PCI
> Firmware spec r3.0, Table 4-2, footnote 2 is talking about.
> 
> Bjorn
> 
> [1] The original ACPI spec intent was that Consumer resources would be
> space like ECAM that is consumed directly by the bridge, and Producer
> resources would be the windows forwarded down to PCI.  But BIOSes
> didn't use the Producer/Consumer bit consistently, so we have to
> assume that all resources in host bridge _CRS are windows, which
> leaves us no way to describe the Consumer resources.

Aside - and now I realize you'd called this out as recently as last
month. Alas the HPE m400 I reference on the other thread about the
APM quirks doesn't have the motherboard resource entry so we're
stuck with exactly the situation you describe above there.

Jon.

-- 
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