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

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Message-Id: <200901051155.26209.jbarnes@virtuousgeek.org>
Date:	Mon, 5 Jan 2009 11:55:25 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Linux PCI <linux-pci@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86 PCI: Do not use interrupt links for devices using MSI-X

On Monday, January 5, 2009 5:50 am Rafael J. Wysocki wrote:
> On Monday 05 January 2009, Ingo Molnar wrote:
> > * Rafael J. Wysocki <rjw@...k.pl> wrote:
> > > From: Rafael J. Wysocki <rjw@...k.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@...k.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@...k.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@...k.pl>

Looks good, applied this one.

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

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