linux-kernel - Re: [PATCH 16/34] AMD IOMMU: add kernel command line parameters for AMD IOMMU

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Date:	Thu, 10 Jul 2008 13:25:23 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	akpm@...ux-foundation.org
Cc:	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 16/34] AMD IOMMU: add kernel command line parameters
 for AMD IOMMU

On Wed, 9 Jul 2008 18:56:34 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Thu, 26 Jun 2008 21:27:52 +0200 Joerg Roedel <joerg.roedel@....com> wrote:
> 
> > This patch adds two parameters to the kernel command line to control behavior
> > of the AMD IOMMU.
> > 
> > Signed-off-by: Joerg Roedel <joerg.roedel@....com>
> > ---
> >  arch/x86/kernel/amd_iommu_init.c |   34 ++++++++++++++++++++++++++++++++++
> >  1 files changed, 34 insertions(+), 0 deletions(-)
> > 
> > diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
> > index d7a75bf..ec6f13b 100644
> > --- a/arch/x86/kernel/amd_iommu_init.c
> > +++ b/arch/x86/kernel/amd_iommu_init.c
> > @@ -789,3 +789,37 @@ void __init amd_iommu_detect(void)
> >  	}
> >  }
> >  
> > +static int __init parse_amd_iommu_options(char *str)
> > +{
> > +	for (; *str; ++str) {
> > +		if (strcmp(str, "off") == 0)
> > +			amd_iommu_disable = 1;
> > +		if (strcmp(str, "isolate") == 0)
> > +			amd_iommu_isolate = 1;
> > +	}
> > +
> > +	return 1;
> > +}
> > +
> > +static int __init parse_amd_iommu_size_options(char *str)
> > +{
> > +	for (; *str; ++str) {
> > +		if (strcmp(str, "32M") == 0)
> > +			amd_iommu_aperture_order = 25;
> > +		if (strcmp(str, "64M") == 0)
> > +			amd_iommu_aperture_order = 26;
> > +		if (strcmp(str, "128M") == 0)
> > +			amd_iommu_aperture_order = 27;
> > +		if (strcmp(str, "256M") == 0)
> > +			amd_iommu_aperture_order = 28;
> > +		if (strcmp(str, "512M") == 0)
> > +			amd_iommu_aperture_order = 29;
> > +		if (strcmp(str, "1G") == 0)
> > +			amd_iommu_aperture_order = 30;
> > +	}
> > +
> > +	return 1;
> > +}
> > +
> > +__setup("amd_iommu=", parse_amd_iommu_options);
> > +__setup("amd_iommu_size=", parse_amd_iommu_size_options);
> 
> Please document kernel boot parameters in Documentation/kernel-parameters.txt.

[PATCH 34/34] does (this should have included [PATCH 34/34], I guess).

I have one related question, we should document all the kernel boot
parameters in Documentation/kernel-parameters.txt?

Some of x86_64 boot parameters are in
Documentations/x86/x86_64/boot-options.txt. The parameters of IOMMUs
are scattered. It's confusing.

http://marc.info/?t=121541873700001&r=1&w=2
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