linux-kernel - Re: boot interrupt quirk (also in 4.19.y) breaks serial ports (was: [PATCH v2 0/2] pci: Add boot interrupt quirk mechanism for Xeon chipsets)

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Message-Id: <20220923192030.162412-1-ghalat@redhat.com>
Date:   Fri, 23 Sep 2022 21:20:30 +0200
From:   Grzegorz Halat <ghalat@...hat.com>
To:     stefan.buehler@....uni-stuttgart.de, sean.v.kelley@...ux.intel.com
Cc:     bhelgaas@...gle.com, bp@...en8.de, corbet@....net,
        gregkh@...uxfoundation.org, kar.hin.ong@...com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, mingo@...hat.com, sassmann@...nic.de,
        tglx@...utronix.de, x86@...nel.org,
        Grzegorz Halat <ghalat@...hat.com>
Subject: Re: boot interrupt quirk (also in 4.19.y) breaks serial ports (was: [PATCH v2 0/2] pci: Add boot interrupt quirk mechanism for Xeon chipsets)

Hi,

On Wed, Sep 16 2020 at 12:12, Stefan Bühler wrote:
> this quirk breaks our serial ports PCIe card (i.e. we don't see any
> output from the connected devices; no idea whether anything we send
> reaches them):

I have the same problem, also with a PCI serial adapter from Oxford Semiconductor.
I've bisected the kernel and it was introduced in b88bf6c3b6ff.
When the system is booted with "pci=noioapicquirk" then the PCI card works fine.
The CPU is Intel Xeon E5-2680 v3 @ 2.50GHz.

Sean, do you have any news about this issue?

Grzegorz