Re: [PATCH 1/2] cxl/pci: Add generic MSI-X/MSI irq support

[Bjorn Helgaas]

On Wed, Nov 02, 2022 at 10:15:24AM -0700, Davidlohr Bueso wrote:
> On Tue, 25 Oct 2022, Bjorn Helgaas wrote:
> ...

> > The MSI case is ugly because the Interrupt Message Number can change
> > when we set Multiple Message Enable.  Maybe we can separate it out and
> > have a less than optimal solution for this case, like allocating one
> > or two vectors and polling if that's not enough.  I expect most
> > devices will support MSI-X.
> 
> Would only supporting MSI-X be so terrible?

My gut feeling is that polling when MSI-X isn't supported wouldn't be
terrible, but I have no data on how common devices that only support
MSI are.

Bjorn