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

[FUJITA Tomonori]

On Tue, 01 Dec 2009 23:55:28 -0800
Yinghai Lu <yinghai@xxxxxxxxxx> 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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/