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From:   "Duan, Zhenzhong" <zhenzhong.duan@intel.com>
To:     "bhelgaas@google.com" <bhelgaas@google.com>
CC:     "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "Yang, Lixiao" <lixiao.yang@intel.com>,
        "Peng, Chao P" <chao.p.peng@intel.com>
Subject: RESEND: MMCONFIG related question
Thread-Topic: RESEND: MMCONFIG related question
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Date:   Fri, 13 Jan 2023 10:15:45 +0000
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(Resend due to format issue)

Hi Helgaas,

Recently Lixiao reported sriov disappered for cards which supported sriov. =
We found it's related to commit "07eab0901ed efi/x86: Remove EfiMemoryMappe=
dIO from E820 map" which removed EfiMemoryMappedIO regions from E820 map wh=
ich lead to pci_mmcfg_reject_broken() check failed, raw_pci_ext_ops isn't s=
et to pci_mmcfg finally, below is the related log. I know maybe bios should=
 add MMCONFIG region into ACPI motherboard resources, just want to ask if w=
e would support the case when MMCONFIG is missed in ACPI motherboard resour=
ces as I see it's treated as "Firmware Info" not "Firmware bug". Thanks

Also has another question, if MMCONFIG happened to be in EfiMemoryMappedIO,=
 even if it's removed from E820 map so that there is no CRS clip for that r=
egion, could it be used for BAR space? Will there be conflict for BAR and M=
MCONFIG access?

[    0.000000] efi: EFI v2.60 by EDK II BIOS ID:SE5C620.86B.01.00.0763.0224=
20181017
[    0.000000] efi: SMBIOS=3D0x6ae78000 ACPI=3D0x6bbab000 ACPI 2.0=3D0x6bba=
b014 MEMATTR=3D0x67e99018 MOKvar=3D0x67b2d000
[    0.000000] efi: Not removing mem06: MMIO range=3D[0xfe000000-0xfe010fff=
] (68KB) from e820 map
[    0.000000] efi: Remove mem09: MMIO range=3D[0x80000000-0x8fffffff] (256=
MB) from e820 map
[    0.000000] e820: remove [mem 0x80000000-0x8fffffff] reserved
[    3.351098] PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem 0x80000000=
-0x8fffffff] (base 0x80000000)
[    3.351742] PCI: not using MMCONFIG
[    4.867853] PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem 0x80000000=
-0x8fffffff] (base 0x80000000)
[    4.904325] [Firmware Info]: PCI: MMCONFIG at [mem 0x80000000-0x8fffffff=
] not reserved in ACPI motherboard resources
[    4.905061] PCI: not using MMCONFIG

Regards
Zhenzhong