linux-kernel - [PATCH 0/2] PCI: MSI: Deal with devices lying about their masking capability

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Date:   Thu,  4 Nov 2021 18:01:28 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Rui Salvaterra <rsalvaterra@...il.com>, kernel-team@...roid.com
Subject: [PATCH 0/2] PCI: MSI: Deal with devices lying about their masking capability

Rui reported[1] that his Nvidia ION system stopped working with 5.15,
with the AHCI device failing to get any MSI. A rapid investigation
revealed that although the device doesn't advertise MSI masking, it
actually needs it. Quality hardware indeed.

Anyway, the couple of patches below are an attempt at dealing with the
issue in a more or less generic way.

[1] https://lore.kernel.org/r/CALjTZvbzYfBuLB+H=fj2J+9=DxjQ2Uqcy0if_PvmJ-nU-qEgkg@mail.gmail.com

Marc Zyngier (2):
  PCI: MSI: Deal with devices lying about their MSI mask capability
  PCI: Add MSI masking quirk for Nvidia ION AHCI

 drivers/pci/msi.c    | 3 +++
 drivers/pci/quirks.c | 6 ++++++
 include/linux/pci.h  | 2 ++
 3 files changed, 11 insertions(+)

-- 
2.30.2