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 00:04:17 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
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 16/34] AMD IOMMU: add kernel command line parameters for AMD IOMMU

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...

YH
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