linux-kernel - Re: [PATCH -tip] x86: fix iommu=soft boot option

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Message-Id: <20091202170715K.fujita.tomonori@lab.ntt.co.jp>
Date:	Wed, 2 Dec 2009 17:07:24 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	yinghai@...nel.org
Cc:	fujita.tomonori@....ntt.co.jp, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -tip] x86: fix iommu=soft boot option

On Tue, 01 Dec 2009 23:55:28 -0800
Yinghai Lu <yinghai@...nel.org> wrote:

> >>>> amd 64 systems that
> >>>> 1. do not have  AGP
> >>>> 2. do not have IOMMU
> >>>> 3. mem > 4g
> >>>> 4. BIOS do not allocate  correct gart in NB.
> >>>> will leave them to use SWIOTLB forcely.
> >>> As I asked earlier, can you tell me what dma ops such system is
> >>> supposed to use?
> >> gart_dma_ops
> > 
> > How does gart_dma_ops work on systems without IOMMU?
> 
> ?

If a system doesn't have IOMMU, what does gart_dma_ops do?


> >>>> -v4: disable translating in early_gart_iommu_check according to FUJITA
> >>> Why can't we always disable translation in early_gart_iommu_check? We
> >>> really need search_agp_bridge() in early_gart_iommu_check()?
> >> just don't want to messed them up.
> > 
> > Sorry, I can't follow you. What does 'always disabling' mess up?
> 
> the AMD K8 system with AGP etc...those systems are some kind of 5 years old.
> 
> and don't have those kind of system to verify...

Ok.
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