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SubjectRe: [PATCH 16/34] AMD IOMMU: add kernel command line parameters for AMD IOMMU
On Thu, 26 Jun 2008 21:27:52 +0200 Joerg Roedel <joerg.roedel@amd.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@amd.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.

I think you just reimplemented memparse().


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