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    SubjectRe: [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@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;
    > + }

    could use
    memparse(str, &str);

    and weight...

    YH


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