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

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Date:	Tue, 8 Dec 2009 09:24:47 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	yinghai@...nel.org
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -tip] x86: fix iommu=soft boot option

On Wed, 2 Dec 2009 17:07:24 +0900
FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> wrote:

> 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?

Ping?

I don't understand the above but the patch is fine about fixing two
things:

- swiotlb wrongly steals the preallocate memory for broken gart.

- a system without agp should disable gart on shutdown.
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