linux-kernel - Re: [PATCH 1/2] PCI: Setup bridge resources earlier

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Message-ID: <81fd91f2-638c-466d-9b27-705a44632713@gmail.com>
Date: Mon, 27 Oct 2025 13:40:10 +0530
From: Bhanu Seshu Kumar Valluri <bhanuseshukumar@...il.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Bjorn Helgaas <helgaas@...nel.org>, bhelgaas@...gle.com, kw@...ux.com,
 LKML <linux-kernel@...r.kernel.org>, linux-pci@...r.kernel.org,
 lucas.demarchi@...el.com, rafael.j.wysocki@...el.com,
 Manivannan Sadhasivam <mani@...nel.org>, bhanuseshukumar@...il.com
Subject: Re: [PATCH 1/2] PCI: Setup bridge resources earlier

On 21/10/25 00:16, Ilpo Järvinen wrote:
> On Sat, 18 Oct 2025, Bhanu Seshu Kumar Valluri wrote:
> 
>> On 18/10/25 00:22, Bjorn Helgaas wrote:
>>> On Fri, Oct 17, 2025 at 11:52:58PM +0530, Bhanu Seshu Kumar Valluri wrote:
>>>>
>>>> I want to report that this PATCH also break PCI RC port on TI-AM64-EVM.
>>>>
>>>> I did git bisect and it pointed to the a43ac325c7cb ("PCI: Set up bridge resources earlier")
>>>>
>>>> Happy to help if any testing or logs are required.
>>>
>>> Thanks for the report!  Can you test this patch?
>>>
>>>   https://patch.msgid.link/20251014163602.17138-1-ilpo.jarvinen@linux.intel.com
>>>
>>> That patch is queued up as
>>> https://git.kernel.org/pub/scm/linux/kernel/git/pci/pci.git/commit/?id=469276c06aff
>>> and should appear in v6.18-rc2 on Sunday if all goes well.
>>>
>>> If that doesn't work, let us know and we'll debug this further.
>>
>> I applied above patch on top of commit f406055cb18c ("Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux")
>>
>> Did pci rescan and run kselftest (pci_endpoint_test). It is working.
>>
>> Thanks for the patch.
> 
> Thanks for testing the revert.
> 
>> Happy to help if any testing or logs are required.
> 
> I'd be interested to understand what goes wrong with the change I was 
> trying to make as I want to attempt the same change later, but with all 
> known issues solved by supporting changes, obviously :-).
> 
> The log snippets you provided are unfortunately too short to contain all 
> the necessary information (missing e.g. root bus resources and possibly 
> other helpful details).
> 
> So if you could provide dmesg and /proc/iomem contents from broken and
> working (with the revert) cases to let me easily compare them, that would 
> help. Please take the dmesg with dyndbg="file drivers/pci/*.c +p" on 
> kernel's cmdline.
> 
> No further actions needed beyond that until later if I need to test some 
> of those supporting changes before retrying all this in the mainline. It 
> may take some time, even more than one kernel cycle as there have been 
> quite many regressions.
> 
> 
Hi

I captured logs with dyndbg="file drivers/pci/*.c +p. See the links below.

Working kernel logs
https://github.com/bhanuseshukumar/kernel_logs/blob/main/working_log

Non Working kernel logs
https://github.com/bhanuseshukumar/kernel_logs/blob/main/not_working_log

Happy to help if any testing or logs are required.

Regards,
Bhanu Seshu Kumvar Valluri