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Date: Fri, 15 Dec 2023 14:36:38 +0100
From: Igor Mammedov <imammedo@redhat.com>
To: Jonathan Woithe <jwoithe@just42.net>
Cc: bhelgaas@google.com, linux-pci@vger.kernel.org,
 linux-kernel@vger.kernel.org
Subject: Re: [Regression] Commit 40613da52b13 ("PCI: acpiphp: Reassign
 resources on bridge if necessary")
Message-ID: <20231215143638.032028eb@imammedo.users.ipa.redhat.com>
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On Fri, 15 Dec 2023 21:57:43 +1030
Jonathan Woithe <jwoithe@just42.net> wrote:

> On Fri, Dec 15, 2023 at 08:43:29AM +1030, Jonathan Woithe wrote:
> > On Thu, Dec 14, 2023 at 02:32:05PM +0100, Igor Mammedov wrote:  
> > > On Thu, 14 Dec 2023 11:58:20 +1030 Jonathan Woithe wrote:  
> > > > 
> > > > Following an update from 5.15.72 to 5.15.139 on one of my machines, the  
> > > 
> > > looks like you are running downstream kernel, can you file bug report
> > > with distro that you use (with a link posed here as well).  
> > 
> > I am running Slackware64 15.0.  The kernels supplied by that distribution
> > are unmodified kernel.org kernels.
> >   
> > > For now offending patches are being reverted, so downstream bug will help
> > > with tracking it and reverting it there.   
> > 
> > The patches will be reverted in Slackware as a matter of course when a
> > kernel.org "-stable" kernel with the fix is adopted.  Slackware does not
> > apply any patches to kernel.org kernels.  Nevertheless, I will raise a post
> > in the forum, hopefully later today.  
> 
> This has now been done:
> 
>   https://www.linuxquestions.org/questions/slackware-14/heads-up-pci-regression-introduced-in-or-around-5-15-129-commit-40613da52b13-4175731828/#post6470559
> 
> > > > The output of lspci is given at the end of this post[1].  The CPU is an
> > > > "Intel(R) Core(TM) i7-5930K CPU @ 3.50GHz" which is not overclocked.  Please
> > > > let me know if you'd like more information about the affected machine.  I
> > > > can also perform additional tests if required, although for various reasons
> > > > these can only be done on Thursdays at present.
> > > > 
> > > > The kernel configuration file can easily be supplied if that would be
> > > > useful.  
> > > 
> > > full dmesg log and used config might help down the road (preferably with current
> > > upstream kernel), as I will be looking into fixing related issues.
> > > 
> > > Perhaps a better way for taking this issue and collecting logs, will be
> > > opening a separate bug at https://bugzilla.kernel.org (pls CC me as well)  
> > 
> > Sure, will do.  I'll be able to get the dmesg log from my earlier tests and
> > config easily enough.  Testing with another kernel will have to wait until
> > next Thursday as that is when I'll next have physical access to the machine.  
> 
> A bug has been opened at bugzilla.kernel.org as requested.  The logs, kernel
> configuration and the "lspci -tv" output (requested in a subsequent email)
> have been added.  The logs and kernel configuration are from the kernel.org
> 5.15.139 kernel.  You have been added to the bug's CC.  The bug number is
> 218268:
> 
>   https://bugzilla.kernel.org/show_bug.cgi?id=218268
> 
> As mentioned, testing another kernel can only happen next Thursday.  If
> you would like other tests done let me know and I'll do them at the same
> time.  I have remote access to the machine, so it's possible to retrieve
> information from it at any time.

lets wait till you can get logs with dyndbg='...' (I've asked for earlier)
and one more test with "pci=realloc" on kernel CLI to see if that helps.

> Let me know if there's anything else I can do to assist.

It looks like  pci_assign_unassigned_bridge_resources() messed up BIOS configured
resources. And then didn't manage to reconfigure bridges correctly, which led to
unassigned BARs => thunderbolt/VGA issues.

Something in ACPI tables must be triggering acpiphp hotplug path during boot.
Can you dump DSDT + SSDT tables and attach them to BZ.
PS:
to dump tables you can use command from acpica-tools (not sure how it's called in Slackware) 
 acpidump -b
which will dump all tables in binary format (so attach those or 'iasl -d' de-compiled ones)

> 
> Regards
>   jonathan
>