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From:   Thomas Gleixner <tglx@linutronix.de>
To:     Marc Zyngier <maz@kernel.org>, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org
Cc:     Bjorn Helgaas <bhelgaas@google.com>,
        Rui Salvaterra <rsalvaterra@gmail.com>, kernel-team@android.com
Subject: Re: [PATCH 0/2] PCI: MSI: Deal with devices lying about their
 masking capability
In-Reply-To: <20211104180130.3825416-1-maz@kernel.org>
References: <20211104180130.3825416-1-maz@kernel.org>
Date:   Fri, 05 Nov 2021 14:14:02 +0100
Message-ID: <87ilx64ued.ffs@tglx>
MIME-Version: 1.0
Content-Type: text/plain
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On Thu, Nov 04 2021 at 18:01, Marc Zyngier wrote:
> 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(+)

Groan.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>