linux-kernel - Re: [RFC][Intel-IOMMU] Fix for IOMMU early crash

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Date:	Mon, 10 Sep 2007 08:43:59 -0700
From:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>
To:	Muli Ben-Yehuda <muli@...ibm.com>
Cc:	"Keshavamurthy, Anil S" <anil.s.keshavamurthy@...el.com>,
	akpm@...l.org, Greg KH <greg@...ah.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	kristen.c.accardi@...el.com
Subject: Re: [RFC][Intel-IOMMU] Fix for IOMMU early crash

On Sun, Sep 09, 2007 at 02:16:19PM +0300, Muli Ben-Yehuda wrote:
> On Sat, Sep 08, 2007 at 01:05:24PM -0700, Keshavamurthy, Anil S wrote:
> 
> > Subject: [RFC][Intel-IOMMU] Fix for IOMMU early crash
> 
> This patch feels like a huge hack. See below.
You seem to be jumping to conclusion without going
in detail. The pci_dev struct contains pointer to sysdata,
which in turn points to the copy of its parent's bus sysdata.
So technically speaking we can eliminate sysdata pointer from
pci_dev struct which is what one portion of this patch does.

> 
> > This patch removes sysdata from pci_dev struct and creates a new
> > field called sys_data which is exclusively used by IOMMU driver to
> > keep its per device context pointer.
> 
> Hmpf, why is this needed? with the pci_sysdata work that recently went
> into mainline we have a void *iommu member in pci_sysdata which should
> be all that's needed. Please elaborate if it's not enough for your
> needs.
I looked at your patch and it was not suitable because I need to store
iommu private pointer in pci_dev and not in the pci_bus. So I have added
a new member sys_data in the pci_dev struct. I can change the name from 
sys_dev to iomu_priv to clear the confusion. Do let me know.


-Anil






> 
> Thanks,
> Muli
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