linux-kernel - PCI bridge window issue (Was: Re: [PATCH] PCI: Fix PCI bridges not to go to D3Hot on older RISC systems)

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Message-ID: <9c120cee-dadf-e5e4-3e27-f817499d27ec@linux.intel.com>
Date: Tue, 2 Dec 2025 20:20:09 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: René Rebe <rene@...ctco.de>
cc: glaubitz@...sik.fu-berlin.de, linux-pci@...r.kernel.org, 
    LKML <linux-kernel@...r.kernel.org>, bhelgaas@...gle.com, 
    riccardo.mottola@...ero.it
Subject: PCI bridge window issue (Was: Re: [PATCH] PCI: Fix PCI bridges not
 to go to D3Hot on older RISC systems)

On Tue, 2 Dec 2025, René Rebe wrote:

> s390x. Maybe users of those want to allow list after testing? Now that
> I think about it I was wondering why ALSA RAD1 audio is not longer
> working in my Sgi Octane with the PCI window not being enabled. Would
> not suprise me it was some change like this, too. Should bisect next

Hi René,

Could you please send me a dmesg and contents of the /proc/iomem (taken 
with root right so it shows the real addresses) so I can look at this PCI 
bridge window issue. If you know a working kernel, having logs from 
working and broken case would be very helpful to easily locate the 
differences.

At this point, no need to bisect as I might be able to figure it out even 
without pinpointing the commit. To avoid spending on issues that are 
already know and have a fix, please check you're not running somewhat old 
kernel as I've already fixed a few things that have gotten broken due to 
recent made PCI bridge window fitting and assignment algorithm changes.

-- 
 i.