linux-kernel - [PATCH v7 0/1] x86/PCI: Ignore E820 reservations for bridge windows on newer systems

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Date:   Thu,  5 May 2022 17:20:15 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Myron Stowe <myron.stowe@...hat.com>,
        Juha-Pekka Heikkila <juhapekka.heikkila@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>
Cc:     Hans de Goede <hdegoede@...hat.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: [PATCH v7 0/1] x86/PCI: Ignore E820 reservations for bridge windows on newer systems

Hi All,

Here is v7 of my patch to address the E820 reservations vs PCI host bridge
ranges issue which are causing touchpad and/or thunderbolt issues on many
different laptop models.

After previous attemps to identify these systems by looking for E820
reservations covering the entire bridge window, which broke the boot
on some coreboot based ChromeBooks we are now back to using a bios date
based approach, now combined with DMI quirks for systems after the
cutoff date which still report a wrong window from their _CRS method
despite them being new(ish).

This is based on top of Bjorn's pci/resource branch:
https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git/log/?h=pci/resource

Regards,

Hans


Hans de Goede (1):
  x86/PCI: Ignore E820 reservations for bridge windows on newer systems

 .../admin-guide/kernel-parameters.txt         |  9 +++
 arch/x86/include/asm/pci_x86.h                |  2 +
 arch/x86/pci/acpi.c                           | 74 ++++++++++++++++++-
 arch/x86/pci/common.c                         |  6 ++
 4 files changed, 89 insertions(+), 2 deletions(-)

-- 
2.36.0