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Date: Thu, 13 Aug 2009 10:24:20 +0800
Message-ID: <3877989d0908121924t1589941fmcd45d3669b78bba4@mail.gmail.com>
Subject: Re: [RFC patch] init default dma_ops to prepare intel_iommu_init 
	failure
From: Luming Yu <luming.yu@gmail.com>
To: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: dwmw2@infradead.org, fenghua.yu@intel.com, tony.luck@intel.com,
       linux-kernel@vger.kernel.org, akpm@linux-foundation.org
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On Thu, Aug 13, 2009 at 10:11 AM, FUJITA
Tomonori<fujita.tomonori@lab.ntt.co.jp> wrote:
> On Wed, 12 Aug 2009 17:20:11 +0800
> Luming Yu <luming.yu@gmail.com> wrote:
>
>> Hi there,
>>
>> On ia64 platform with dmar table and new upstream
>> kernel(config_dmar_default_on enabled),
>> if intel_iommu_init ends up without dma_ops initialized or other iommu
>> failures.
>> We got nothing to fall back. The following patch fixes it.
>
> Hmm, I think that the current code should work.

Without the patch, I encounters boot failure with the following .config

162-CONFIG_IA64_GENERIC=y
163-# CONFIG_IA64_DIG is not set
164:# CONFIG_IA64_DIG_VTD is not set

> Note that IA64_DIG_VTD doesn't enable SWIOTLB so there is fall
> back. That's kinda the IA64 policy about non IA64_GENERIC kernel.
>
how comes?