linux-kernel - [RFC 0/2] x86/PCI: Ignore EFI memmap MMIO entries

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Date:   Mon, 14 Feb 2022 16:17:57 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     Hans de Goede <hdegoede@...hat.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Myron Stowe <myron.stowe@...hat.com>,
        Juha-Pekka Heikkila <juhapekka.heikkila@...il.com>,
        Benoit Grégoire <benoitg@...us.ca>,
        Hui Wang <hui.wang@...onical.com>, linux-acpi@...r.kernel.org,
        linux-pci@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC 0/2] x86/PCI: Ignore EFI memmap MMIO entries

Hi All,

Here is a new attempt at fixing the issue where on some laptops
there are EFI memmap MMIO entries covering the entire PCI bridge
mem window, causing Linux to be unable to find free space to
assign to unassigned BARs.

This is marked as RFC atm because I'm waiting for feedback from
testers.

Regards,

Hans


Hans de Goede (2):
  x86/e820: Map EFI_MEMORY_MAPPED_IO to a new E820_TYPE_MMIO type
  x86/PCI: Ignore EFI memmap MMIO entries

 arch/x86/include/asm/e820/types.h       |  3 +++
 arch/x86/include/asm/iommu.h            |  3 ++-
 arch/x86/kernel/e820.c                  |  5 +++++
 arch/x86/kernel/resource.c              |  4 ++++
 arch/x86/mm/ioremap.c                   |  1 +
 arch/x86/pci/mmconfig-shared.c          | 15 +++++++++++----
 arch/x86/platform/efi/efi.c             |  5 ++++-
 drivers/firmware/efi/libstub/x86-stub.c |  5 ++++-
 8 files changed, 34 insertions(+), 7 deletions(-)

-- 
2.33.1