linux-kernel - Re: [PATCH 01/34] AMD IOMMU: add Kconfig entry

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Date:	Thu, 10 Jul 2008 09:50:50 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	mingo@...e.hu
Cc:	pavel@...e.cz, joerg.roedel@....com, tglx@...utronix.de,
	mingo@...hat.com, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, bhavna.sarathy@....com,
	Sebastian.Biemueller@....com, robert.richter@....com,
	joro@...tes.org
Subject: Re: [PATCH 01/34] AMD IOMMU: add Kconfig entry

On Wed, 9 Jul 2008 10:48:37 +0200
Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Pavel Machek <pavel@...e.cz> wrote:
> 
> > > +config AMD_IOMMU
> > > +	bool "AMD IOMMU support"
> > > +	select SWIOTL
> > 
> > SWIOTLB?
> 
> yep, that typo got already fixed via the patch below.
> 
> 	Ingo
> 
> --------------->
> commit 07c40e8a1acdb56fca485a6deeb252ebf19509a1
> Author: Ingo Molnar <mingo@...e.hu>
> Date:   Fri Jun 27 11:31:28 2008 +0200
> 
>     x86, AMD IOMMU: build fix #3
>     
>     fix typo causing:
>     
>     arch/x86/kernel/built-in.o: In function `__unmap_single':
>     amd_iommu.c:(.text+0x17771): undefined reference to `iommu_area_free'
>     arch/x86/kernel/built-in.o: In function `__map_single':
>     amd_iommu.c:(.text+0x1797a): undefined reference to `iommu_area_alloc'
>     amd_iommu.c:(.text+0x179a2): undefined reference to `iommu_area_alloc'
>     
>     Signed-off-by: Ingo Molnar <mingo@...e.hu>
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 62a2820..8aae462 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -551,7 +551,7 @@ config CALGARY_IOMMU_ENABLED_BY_DEFAULT
>  
>  config AMD_IOMMU
>  	bool "AMD IOMMU support"
> -	select SWIOTL
> +	select SWIOTLB
>  	depends on X86_64 && PCI && ACPI
>  	help
>  	  Select this to get support for AMD IOMMU hardware in your system.

This fix is fine though the explicit fix is that AMD_IOMMU depends on
IOMMU_HELPER since they are the IOMMU helper functions. SWIOTLB
requires IOMMU_HELPER so declaring that AMD_IOMMU depends on SWIOTLB
properly fixes the problems.


diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index f98e1c3..4d85501 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -579,7 +579,7 @@ config SWIOTLB
 	  3 GB of memory. If unsure, say Y.
 
 config IOMMU_HELPER
-	def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB)
+	def_bool (CALGARY_IOMMU || GART_IOMMU || SWIOTLB || AMD_IOMMU)
 config MAXSMP
 	bool "Configure Maximum number of SMP Processors and NUMA Nodes"
 	depends on X86_64 && SMP
--
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