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

[Jon Hunter]

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@xxxxxxxxxx>
> AuthorDate:    Fri, 28 Nov 2025 16:20:55 -05:00
> Committer:     Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> 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@xxxxxxxxxxxxx>
> Signed-off-by: Radu Rendec <rrendec@xxxxxxxxxx>
> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Link: https://lore.kernel.org/linux-pci/878qpg4o4t.ffs@tglx/
> Link: https://patch.msgid.link/20251128212055.1409093-4-rrendec@xxxxxxxxxx


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