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

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Date:   Fri, 6 Jan 2023 00:22:09 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Williams, Dan J" <dan.j.williams@...el.com>,
        Bjorn Helgaas <helgaas@...nel.org>,
        "Liang, Kan" <kan.liang@...ux.intel.com>
CC:     "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>,
        "Jiang, Dave" <dave.jiang@...el.com>
Subject: RE: Bug report: the extended PCI config space is missed with 6.2-rc2

> ...and Dave, who reported that CXL enumeration was busted in -rc2, says
> this patch fixes that. So you can also add:
>
> Tested-by: Dave Jiang <dave.jiang@...el.com>

Also seems good for my Broadwell/EDAC system.

Boot messages mentioning MMCONFIG are:

$ dmesg | grep MMCONFIG
[   12.280360] PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem 0x80000000-0x8fffffff] (base 0x80000000)
[   12.291606] PCI: not using MMCONFIG
[   12.873676] PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem 0x80000000-0x8fffffff] (base 0x80000000)
[   12.893266] PCI: MMCONFIG at [mem 0x80000000-0x8fffffff] reserved in ACPI motherboard resources or EFI
[   12.903601] PCI: MMCONFIG for 0000 [bus00-7f] at [mem 0x80000000-0x87ffffff] (base 0x80000000) (size reduced!)
[   13.385616] acpi PNP0A03:00: fail to add MMCONFIG information, can't access extended configuration space under this bridge
[   14.115617] acpi PNP0A03:01: fail to add MMCONFIG information, can't access extended configuration space under this bridge
[   17.969639] acpi PNP0A08:02: fail to add MMCONFIG information, can't access extended configuration space under this bridge
[   18.298640] acpi PNP0A08:03: fail to add MMCONFIG information, can't access extended configuration space under this bridge

The EDAC driver works with this patch applied.

Tested-by: Tony Luck <tony.luck@...el.com>

-Tony