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    Subject[PATCH 16/34] AMD IOMMU: add kernel command line parameters for AMD IOMMU
    Date
    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);
    --
    1.5.3.7



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