On Sat, Jan 12, 2013 at 09:12:25PM +0000, Arnd Bergmann wrote:
> On Saturday 12 January 2013, Thierry Reding wrote:
> > > I already hinted at that in one of the other subthreads. Having such a
> > > multiplex would also allow the driver to be built as a module. I had
> > > already thought about this when I was working on an earlier version of
> > > these patches. Basically these would be two ops attached to the host
> > > bridge, and the generic arch_setup_msi_irq() could then look that up
> > > given the struct pci_dev that is passed to it and call this new per-
> > > host bridge .setup_msi_irq().
> > 
> > struct pci_ops looks like a good place to put these. They'll be
> > available from each struct pci_bus, so should be easy to call from
> > arch_setup_msi_irq().
> > 
> > Any objections?
> > 
> 
> struct pci_ops has a long history of being specifically about
> config space read/write operations, so on the one hand it does
> not feel like the right place to put interrupt specific operations,
> but on the other hand, the name sounds appropriate and I cannot
> think of any other place to put this, so it's fine with me.
> 
> The only alternative I can think of is to introduce a new
> structure next to it in struct pci_bus, but that feels a bit
> pointless. Maybe Bjorn has a preference one way or the other.

The name pci_ops is certainly generic enough. Also the comment above the
structure declaration says "Low-level architecture-dependent routines",
which applies to the MSI functions as well.

Thierry