linux-kernel - Re: [PATCH] IR: Disallow interrupt remapping if not all ioapic under interrupt remapping

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Message-ID: <20090920003737.GB21419@youquan-linux.bj.intel.com>
Date:	Sat, 19 Sep 2009 20:37:37 -0400
From:	"Youquan,Song" <youquan.song@...ux.intel.com>
To:	dwmw2@...radead.org, Suresh Siddha <suresh.b.siddha@...el.com>
Cc:	"Song, Youquan" <youquan.song@...el.com>,
	"mingo@...e.hu" <mingo@...e.hu>, "hpa@...or.com" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dwmw2@...radead.org" <dwmw2@...radead.org>
Subject: Re: [PATCH] IR: Disallow interrupt remapping if not all ioapic under interrupt remapping

On Wed, Sep 09, 2009 at 02:42:55PM -0700, Suresh Siddha wrote:
> On Mon, 2009-09-07 at 07:58 -0700, Song, Youquan wrote:
> > Current kernel enable interrupt remapping only when all the vt-d unit support
> > interrupt remapping. So it is reasonable we should also disallow enabling
> > intr-remapping if there any io-apics that are not listed under vt-d units. 
> > Otherwise we can run into issues.
> > 
> > Acked-by: Suresh Siddha <suresh.b.siddha@...el.com> 
> > Signed-off-by: Youquan Song <youquan.song@...el.com>
> > ---
> > 
> > diff --git a/drivers/pci/dmar.c b/drivers/pci/dmar.c
> > index 7b287cb..a8a4383 100644
> > --- a/drivers/pci/dmar.c
> > +++ b/drivers/pci/dmar.c
> > @@ -570,9 +570,6 @@ int __init dmar_table_init(void)
> >  		printk(KERN_INFO PREFIX "No ATSR found\n");
> >  #endif
> >  
> > -#ifdef CONFIG_INTR_REMAP
> > -	parse_ioapics_under_ir();
> > -#endif
> >  	return 0;
> >  }
> >  
> > diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
> > index 4f5b871..ebfa47b 100644
> > --- a/drivers/pci/intr_remapping.c
> > +++ b/drivers/pci/intr_remapping.c
> > @@ -626,6 +626,11 @@ int __init enable_intr_remapping(int eim)
> >  	struct dmar_drhd_unit *drhd;
> >  	int setup = 0;
> >  
> > +	if (parse_ioapics_under_ir() != 1) {
> > +		printk(KERN_INFO "Not enable interrupt remapping\n");
> > +		return -1;
> > +	}
> > +
> >  	for_each_drhd_unit(drhd) {
> >  		struct intel_iommu *iommu = drhd->iommu;
> >  
> 
> David, Can you also pick this up please?
> 
> thanks,
> suresh

Change the patch title to short one.
David, Couly you please also pick this up? Sorry, if you have done.

Thanks.


> 
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