Re: [PATCH] x86 PCI: Do not use interrupt links for devices using MSI-X

Jesse Barnes
2009-01-05T19:55:37Z

On Monday, January 5, 2009 5:50 am Rafael J. Wysocki wrote:
> On Monday 05 January 2009, Ingo Molnar wrote:
> > * Rafael J. Wysocki <rjw@sisk.pl> wrote:
> > > From: Rafael J. Wysocki <rjw@sisk.pl>
> > >
> > > pcibios_enable_device() and pcibios_disable_device() don't handle
> > > IRQs for devices that have MSI enabled and it should tread the
> >
> > s/tread/treat
>
> Ah, thanks.
>
> > > devices with MSI-X enabled in the same way.
> > >
> > > Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
> > > ---
> > > arch/x86/pci/common.c | 4 ++--
> > > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > looks good - Jesse, what do you think?
> >
> > Rafael, i'm curious is this in response to some regression/bug? Did some
> > box or driver get confused by us enabling/disabling the GSI? Some IRQ
> > flood perhaps?
>
> Well, I don't have any MSI-X capable boxes around. :-)
>
> I was just reviewing the code and spotted this.
>
> > btw., there's a small observation:
> > > + if (!dev->msi_enabled && !dev->msix_enabled)
> >
> > maybe a "pci_has_gsi_irq()" wrapper would make these checks cleaner and
> > would make things more robust, should there be any new IRQ delivery
> > method be introduced in the future?
>
> Well, perhaps something like the patch below?
>
> Thanks,
> Rafael
>
> ---
> Subject: x86 PCI: Do not use interrupt links for devices using MSI-X (rev.
> 2) From: Rafael J. Wysocki <rjw@sisk.pl>
>
> pcibios_enable_device() and pcibios_disable_device() don't handle
> IRQs for devices that have MSI enabled and it should treat the
> devices with MSI-X enabled in the same way.
>
> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>

Looks good, applied this one.

Thanks,
--
Jesse Barnes, Intel Open Source Technology Center