Message-ID: <4B1DA310.7050408@kernel.org>
Date: Mon, 07 Dec 2009 16:51:28 -0800
From: Yinghai Lu <yinghai@kernel.org>
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To: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
CC: mingo@elte.hu, linux-kernel@vger.kernel.org
Subject: Re: [PATCH -tip] x86: fix iommu=soft boot option
References: <20091202162510Q.fujita.tomonori@lab.ntt.co.jp>	<4B161D70.3030301@kernel.org>	<20091202170715K.fujita.tomonori@lab.ntt.co.jp> <20091208092438Z.fujita.tomonori@lab.ntt.co.jp>
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FUJITA Tomonori wrote:
> On Wed, 2 Dec 2009 17:07:24 +0900
> FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> wrote:
> 
>> On Tue, 01 Dec 2009 23:55:28 -0800
>> Yinghai Lu <yinghai@kernel.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?

gart can do hw translation...

YH
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