linux-kernel - Re: [PATCH] x86-64: disable the GART in shutdown

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Date:	Sat, 23 Jun 2007 12:59:17 +0200
From:	Andi Kleen <ak@...e.de>
To:	Muli Ben-Yehuda <muli@...ibm.com>
Cc:	Yinghai Lu <Yinghai.Lu@....com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Vivek Goyal <vgoyal@...ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86-64: disable the GART in shutdown


> I'm going to need exactly the same hook fro Calgary, as well Intel for
> VT-d, and AMD for their upcoming IOMMU, etc. How about we do
> 
> struct iommu_ops {
>   struct dma_ops {
>     ...
>   }
>   void (*shutdown)(void);
> }
> 
> And then pci_iommu_shutdown() becomes
> 
> if (iommu_ops->shutdown)
>   iommu_ops->shutdown();

I think it's cleaner if everybody registers their own shutdown handler in sysfs
Don't see any value in going through a generic layer because there is no
shared code.

-Andi


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