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

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Message-ID: <0113ca60-acf2-f4db-3230-959e9bb15726@o2.pl>
Date:   Mon, 23 Jan 2023 22:00:43 +0100
From:   Mateusz Jończyk <mat.jonczyk@...pl>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-acpi@...r.kernel.org, linux-i2c@...r.kernel.org,
        "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

W dniu 23.01.2023 o 21:33, Bjorn Helgaas pisze:
> 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

The hardware in question has a working Windows XP installation,
and I could in theory check which interrupt vector it uses - but
I think that such reverse engineering is forbidden by Windows' EULA.

Greetings,
Mateusz