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>
