linux-kernel - Re: [PATCH v3 3/3] PCI: dwc: Enable MSI affinity support

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Message-ID: <cfe44924-3419-4f31-8ab3-87b769d21a5b@nvidia.com>
Date: Wed, 21 Jan 2026 14:00:06 +0000
From: Jon Hunter <jonathanh@...dia.com>
To: Radu Rendec <rrendec@...hat.com>, Thomas Gleixner <tglx@...utronix.de>,
 Manivannan Sadhasivam <mani@...nel.org>
Cc: Daniel Tsai <danielsftsai@...gle.com>, Marek Behún
 <kabel@...nel.org>, Krishna Chaitanya Chundru <quic_krichai@...cinc.com>,
 Bjorn Helgaas <bhelgaas@...gle.com>, Rob Herring <robh@...nel.org>,
 Krzysztof Wilczyński <kwilczynski@...nel.org>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>, Jingoo Han
 <jingoohan1@...il.com>, Brian Masney <bmasney@...hat.com>,
 Eric Chanudet <echanude@...hat.com>,
 Alessandro Carminati <acarmina@...hat.com>, Jared Kangas
 <jkangas@...hat.com>, linux-pci@...r.kernel.org,
 linux-kernel@...r.kernel.org,
 "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v3 3/3] PCI: dwc: Enable MSI affinity support


On 20/01/2026 22:30, Radu Rendec wrote:

...

>> So it looks like it is hanging when disabling the non-boot CPUs. So far
>> it only appears to happen on Tegra194.
>>
>> Let me know if you have any suggestions.
> 
> Ouch. I'm afraid this is going to be much harder to figure out than the
> previous one, especially since I can't get access easily to a board to
> test on. I will try to reserve a board and reproduce the bug.
> 
> Meanwhile, if you (or someone else in your team) can spare a few cycles,
> could you please try to reproduce the bug again with the debug patch
> below applied, and a few other changes:
>   * enable debug messages in kernel/irq/cpuhotplug.c;
>   * save the contents of /proc/interrupts to a file before suspending;
>   * add "no_console_suspend" to the kernel command line (although it
>     looks like you already have it).
> 
> It will be much more verbose during suspend but hopefully we can at
> least figure out how far along it goes and how it's related to the MSI
> affinity configuration.


Thanks. I have dumped the boot log with the prints here:

https://pastebin.com/G8c2ssdt

And the dump of /proc/interrupts here:

https://pastebin.com/Wqzxw3r6

Looks like the last thing I see entering suspend is ...

  irq_chip_redirect_set_affinity: irq 162 mask 0x7f

That appears to be a PCIe interrupt. Let me know if there are more tests 
I can run.

Cheers
Jon

-- 
nvpublic