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 14:41:47 +0200
From:	Joerg Roedel <joerg.roedel@....com>
To:	Yinghai Lu <yhlu.kernel@...il.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 16/34] AMD IOMMU: add kernel command line parameters for AMD IOMMU

On Thu, Jul 10, 2008 at 12:04:17AM -0700, Yinghai Lu wrote:
> On Thu, Jun 26, 2008 at 12:27 PM, 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;
> > +       }
> 
> could use
> memparse(str, &str);
> 
> and weight...

Thanks for that hint. I wasn't aware of memparse.

Joerg

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