Re: [PATCH 0/3] x86, MSI: Support multiple MSIs in presense of IRQremapping

From: Alexander Gordeev
Date: Wed Aug 01 2012 - 05:10:39 EST


On Tue, Jul 31, 2012 at 02:12:49PM -0700, Suresh Siddha wrote:
> On Tue, 2012-07-31 at 13:41 +0200, Alexander Gordeev wrote:
> > Currently multiple MSI mode is limited to a single vector per device (at
> > least on x86 and PPC). This series breathes life into pci_enable_msi_block()
> > and makes it possible to set interrupt affinity for multiple IRQs, similarly
> > to MSI-X. Yet, only for x86 and only when IOMMUs are present.
> >
> > Although IRQ and PCI subsystems are modified, the current behaviour left
> > intact. The drivers could just start using multiple MSIs just by following
> > the existing documentation.
>
> So while I am ok with the proposed changes, I will hold off acking until
> I see the corresponding driver changes (using pci_enable_msi_block()
> etc) that take advantage of these changes ;)

Well, I make Broadcom driver believe it is running MSI-X while it is running
multipe MSIs in fact. This is not at all a decent patch, just to make debugging
possible.