linux-kernel - Re: PCI bridge window issue

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Message-Id: <20251202.192907.1946164892504460809.rene@exactco.de>
Date: Tue, 02 Dec 2025 19:29:07 +0100 (CET)
From: René Rebe <rene@...ctco.de>
To: ilpo.jarvinen@...ux.intel.com
Cc: glaubitz@...sik.fu-berlin.de, linux-pci@...r.kernel.org,
 linux-kernel@...r.kernel.org, bhelgaas@...gle.com,
 riccardo.mottola@...ero.it
Subject: Re: PCI bridge window issue

Hi Ilpo,

On Tue, 2 Dec 2025 20:20:09 +0200 (EET), Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com> wrote:

> 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.

Thank you so much for offering help with that different
issue. Sgi/Octane IP30 only went upstream some years ago. I only have
the likewise not upstream snd-rad1 working with much older out of tree
kernels. Thanks you for the hints, I'll try to find some time to to
further debug this soon to bring the snd-rad1 ALSA driver upstream,
too.

> 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 can not easily bisect mips64 sgi-ip30 anyway. As it was out of tree
for 20y and the uptreamed code changed a lot during cleanup for
merging.

Good to have a contact to look into this next.

Thanks!
	René

-- 
René Rebe, ExactCODE GmbH, Berlin, Germany
https://exactco.de • https://t2linux.com • https://patreon.com/renerebe