linux-kernel - RE: Bug report: the extended PCI config space is missed with 6.2-rc2

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Message-ID: <SJ1PR11MB608347C8A95717A8BEE3BF2DFCFA9@SJ1PR11MB6083.namprd11.prod.outlook.com>
Date:   Thu, 5 Jan 2023 19:58:47 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Williams, Dan J" <dan.j.williams@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>
CC:     "Liang, Kan" <kan.liang@...ux.intel.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "hdegoede@...hat.com" <hdegoede@...hat.com>,
        "kernelorg@...ead.fr" <kernelorg@...ead.fr>,
        "kjhambrick@...il.com" <kjhambrick@...il.com>,
        "2lprbe78@...k.com" <2lprbe78@...k.com>,
        "nicholas.johnson-opensource@...look.com.au" 
        <nicholas.johnson-opensource@...look.com.au>,
        "benoitg@...us.ca" <benoitg@...us.ca>,
        "mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>,
        "wse@...edocomputers.com" <wse@...edocomputers.com>,
        "mumblingdrunkard@...tonmail.com" <mumblingdrunkard@...tonmail.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Box, David E" <david.e.box@...el.com>,
        "Sun, Yunying" <yunying.sun@...el.com>
Subject: RE: Bug report: the extended PCI config space is missed with 6.2-rc2

> Definitely an ambiguity / conflict, but not sure it is a bug when you
> look at from the perspective of how would an EFI runtime service use
> ECAM/MMCONFIG space? 
>
> Would it be enough to add this clarification in "EFI 2.9 Table 7-6
> Memory Type Usage after ExitBootServices()"?
>
> s/This memory is not used by the OS./This memory is not used by the OS,
> unless ACPI declares it for another purpose./

In the case of the EDAC driver there isn't any ACPI declaration.  It just does
pci_get_device() to find the devices it needs to use with a lookup based on
vendor-id and device-id.

and then uses	pci_read_config_dword() to read various offsets from config
space, some of which are in PCIe extended config space.

-Tony