linux-kernel - Re: [tip: irq/msi] PCI: dwc: Enable MSI affinity support

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Message-ID: <44509520-f29b-4b8a-8986-5eae3e022eb7@nvidia.com>
Date: Tue, 6 Jan 2026 09:53:23 +0000
From: Jon Hunter <jonathanh@...dia.com>
To: linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
 Radu Rendec <rrendec@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
 "linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>
Subject: Re: [tip: irq/msi] PCI: dwc: Enable MSI affinity support

Hi Radu,

On 15/12/2025 21:34, tip-bot2 for Radu Rendec wrote:
> The following commit has been merged into the irq/msi branch of tip:
> 
> Commit-ID:     eaf290c404f7c39f23292e9ce83b8b5b51ab598a
> Gitweb:        https://git.kernel.org/tip/eaf290c404f7c39f23292e9ce83b8b5b51ab598a
> Author:        Radu Rendec <rrendec@...hat.com>
> AuthorDate:    Fri, 28 Nov 2025 16:20:55 -05:00
> Committer:     Thomas Gleixner <tglx@...utronix.de>
> CommitterDate: Mon, 15 Dec 2025 22:30:48 +01:00
> 
> PCI: dwc: Enable MSI affinity support
> 
> Leverage the interrupt redirection infrastructure to enable CPU affinity
> support for MSI interrupts. Since the parent interrupt affinity cannot
> be changed, affinity control for the child interrupt (MSI) is achieved
> by redirecting the handler to run in IRQ work context on the target CPU.
> 
> This patch was originally prepared by Thomas Gleixner (see Link tag below)
> in a patch series that was never submitted as is, and only parts of that
> series have made it upstream so far.
> 
> Originally-by: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Radu Rendec <rrendec@...hat.com>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Link: https://lore.kernel.org/linux-pci/878qpg4o4t.ffs@tglx/
> Link: https://patch.msgid.link/20251128212055.1409093-4-rrendec@redhat.com


With next-20260105 I am observing the following warning on the Tegra194 
Jetson AGX platform ...

  WARNING KERN genirq: irq_chip DW-PCI-MSI-0001:01:00.0 did not update
   eff. affinity mask of irq 171

Bisect is point to this commit. This platform is using the driver 
drivers/pci/controller/dwc/pcie-tegra194.c. Is there some default 
affinity that we should be setting to avoid this warning?

Thanks
Jon

-- 
nvpublic