linux-kernel - Re: [patch take 2][Intel-IOMMU] Fix for IOMMU early crash

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Date:	Wed, 3 Oct 2007 18:36:07 -0700
From:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, Greg KH <greg@...ah.com>,
	muli@...ibm.com, paulus@...ba.org, kristen.c.accardi@...el.com
Subject: Re: [patch take 2][Intel-IOMMU] Fix for IOMMU early crash

On Thu, Oct 04, 2007 at 11:19:33AM +1000, Benjamin Herrenschmidt wrote:
> > Index: 2.6-mm/include/linux/pci.h
> > ===================================================================
> > --- 2.6-mm.orig/include/linux/pci.h	2007-10-03 13:48:20.000000000 -0700
> > +++ 2.6-mm/include/linux/pci.h	2007-10-03 13:49:08.000000000 -0700
> > @@ -195,6 +195,7 @@
> >  #ifdef CONFIG_PCI_MSI
> >  	struct list_head msi_list;
> >  #endif
> > +	void		*iommu_private;	/* hook for IOMMU specific extension */
> >  };
> 
> I'm not fan of this. That would imply that iommu stuff is specific to
> PCI or that sort of thing.
> 
> Why don't you use the new struct dev_archdata mechanism ? That's what I
> use on powerpc to provide optional iommu linkage to any device in the
> system.
Good one. I will certainly try out your idea and will update the list
tomorrow.

-Anil
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