linux-kernel - [PATCH v5 0/2] x86/PCI: Ignore E820 reservations for bridge windows on newer systems

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Message-Id: <20211014183943.27717-1-hdegoede@redhat.com>
Date:   Thu, 14 Oct 2021 20:39:41 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     "Rafael J . Wysocki" <rjw@...ysocki.net>,
        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>, linux-acpi@...r.kernel.org,
        linux-pci@...r.kernel.org, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v5 0/2] x86/PCI: Ignore E820 reservations for bridge windows on newer systems

Hi All,

Here is v5 of my patch to address the E820 reservations vs PCI host bridge
windows issue which is causing touchpad and/or thunderbolt issues on many
different laptop models.

Changes in v5:
- Drop mention of Windows behavior from the commit msg, replace with a
  reference to the specs
- Improve documentation in Documentation/admin-guide/kernel-parameters.txt
- Reword the big comment added, use "PCI host bridge window" in it and drop
  all references to Windows
- Add a second patch moving the arch/x86/pci/acpi.c printk-s to pr_info/warn

Changes in v4:
- Rewrap the big comment block to fit in 80 columns

I believe that this is ready for merging now.

Bjorn, can you review/ack this please ?

x86/tip folks it would be ideal if you can pick this up and send at
least the first patch as a fix to Linus for 5.15. This fixes a bug which
has been plaguing a lot of users (see all the bug links in the commit msg).

Regards,

Hans


Hans de Goede (2):
  x86/PCI: Ignore E820 reservations for bridge windows on newer systems
  x86/PCI/ACPI: Replace printk calls with pr_info/pr_warn calls

 .../admin-guide/kernel-parameters.txt         |  9 ++++
 arch/x86/include/asm/pci_x86.h                | 10 ++++
 arch/x86/kernel/resource.c                    |  4 ++
 arch/x86/pci/acpi.c                           | 49 +++++++++++++++----
 arch/x86/pci/common.c                         |  6 +++
 5 files changed, 68 insertions(+), 10 deletions(-)

-- 
2.31.1