linux-kernel - Re: [PATCH v3 RESEND] acpi,pci: warn about duplicate IRQ routing entries returned from

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Message-ID: <20230123203301.GA909338@bhelgaas>
Date:   Mon, 23 Jan 2023 14:33:01 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Mateusz Jończyk <mat.jonczyk@...pl>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-i2c@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>, Borislav Petkov <bp@...e.de>,
        Jean Delvare <jdelvare@...e.com>,
        Jean Delvare <jdelvare@...e.de>
Subject: Re: [PATCH v3 RESEND] acpi,pci: warn about duplicate IRQ routing
 entries returned from _PRT

On Sat, Jan 21, 2023 at 04:33:14PM +0100, Mateusz Jończyk wrote:
> On some platforms, the ACPI _PRT function returns duplicate interrupt
> routing entries. Linux uses the first matching entry, but sometimes the
> second matching entry contains the correct interrupt vector.
>
> Print an error to dmesg if duplicate interrupt routing entries are
> present, so that we could check how many models are affected.

It shouldn't be too hard to use qemu to figure out whether Windows
uses the last matching entry, i.e., treating _PRT entries as
assignments.  If so, maybe Linux could just do the same.

Is anybody up for that?

Bjorn