Re: [PATCH v2 0/2] msi: extend msi_irqs sysfs entries to platform devices

[Greg KH]

On Thu, Aug 12, 2021 at 10:53:39PM +1200, Barry Song wrote:
> From: Barry Song <song.bao.hua@xxxxxxxxxxxxx>
> 
> Just like pci devices have msi_irqs which can be used by userspace irq affinity
> tools or applications to bind irqs, platform devices also widely support msi
> irqs.
> For platform devices, for example ARM SMMU, userspaces also care about its msi
> irqs as applications can know the mapping between devices and irqs and then
> make smarter decision on handling irq affinity. For example, for SVA mode,
> it is better to pin io page fault to the numa node applications are running
> on. Otherwise, io page fault will get a remote page from the node iopf happens
> rather than from the node applications are running on.
> 
> The first patch extracts the sysfs populate/destory code from PCI to
> MSI core. The 2nd patch lets platform-msi export msi_irqs entry so that
> userspace can know the mapping between devices and irqs for platform
> devices.

Acked-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>