linux-kernel - Re: Questions about function detect_intel

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Message-ID: <CAEk7JKYQVj6E-QoA+-5EwMGXXdN-6Yt_9_kUcsyZ7x89p=OOFQ@mail.gmail.com>
Date:	Mon, 26 Nov 2012 16:44:08 +0800
From:	"Li, Zhen-Hua" <lizhenhua.dev@...il.com>
To:	Dave Airlie <airlied@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Questions about function detect_intel_iommu(void)

I read the code of kernel 3.5.2, and found this function is only
called in function void __init pci_iommu_alloc(void) in file
arch/ia64/kernel/pci-dma.c .
So I think it is only called on IA64 system.


On Mon, Nov 26, 2012 at 4:25 PM, Dave Airlie <airlied@...il.com> wrote:
> On Mon, Nov 26, 2012 at 4:36 PM, Li, Zhen-Hua <lizhenhua.dev@...il.com> wrote:
>> Hi all,
>>      I am debugging a bug about iommu recently and got a question
>> about the function detect_intel_opmmu,  Could anybody kindly help me?
>>
>>      In dmar.c, this function :
>>                 void __init detect_intel_iommu(void)
>>      In 2.6.32 and redhat enterprise kernel 2.6.18, it is called by
>> x86_64 system . But in kernel 3.5.2, it is only needed on IA64 system.
>>
>>     And my question is: is this function really needed for x86_64 and
>> i386 in 2.6.32?
>
> Not sure why you think its IA64, its called from the iommu init code
> in 3.x here.
>
> via the IOMMU_INIT_POST macro
> Dave.
>>
>>
>> Thanks and Regards.
>>
>> Li, Zhen-Hua
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