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

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Message-ID: <20080627142558.GG18644@cs181140183.pp.htv.fi>
Date:	Fri, 27 Jun 2008 17:25:58 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	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 Thu, Jun 26, 2008 at 09:27:37PM +0200, Joerg Roedel wrote:
> This patch adds the Kconfig entry for the AMD IOMMU driver.
> 
> Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> ---
>  arch/x86/Kconfig |    7 +++++++
>  1 files changed, 7 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index e0edaaa..5a82f18 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -549,6 +549,13 @@ config CALGARY_IOMMU_ENABLED_BY_DEFAULT
>  	  Calgary anyway, pass 'iommu=calgary' on the kernel command line.
>  	  If unsure, say Y.
>  
> +config AMD_IOMMU
> +	bool "AMD IOMMU support"
> +	select SWIOTL
> +	depends on X86_64 && PCI
> +	help
> +	  Select this to get support for AMD IOMMU hardware in your system.
> +
>...

This tells neither what as IOMMU is nor whether my system actually has 
one.

Please shortly describe in the help text what an IOMMU is and which
AMD systems have an IOMMU.

The goal is that a system administrator building a kernel for his system 
gets enough information for deciding whether to enable or disable this 
option.

Thanks
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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