x86, AMD IOMMU: add kernel command line parameters for AMD IOMMU
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> Cc: iommu@lists.linux-foundation.org Cc: bhavna.sarathy@amd.com Cc: Sebastian.Biemueller@amd.com Cc: robert.richter@amd.com Cc: joro@8bytes.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -789,3 +789,37 @@ void __init amd_iommu_detect(void)
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}
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}
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static int __init parse_amd_iommu_options(char *str)
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{
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for (; *str; ++str) {
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if (strcmp(str, "off") == 0)
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amd_iommu_disable = 1;
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if (strcmp(str, "isolate") == 0)
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amd_iommu_isolate = 1;
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}
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return 1;
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}
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static int __init parse_amd_iommu_size_options(char *str)
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{
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for (; *str; ++str) {
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if (strcmp(str, "32M") == 0)
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amd_iommu_aperture_order = 25;
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if (strcmp(str, "64M") == 0)
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amd_iommu_aperture_order = 26;
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if (strcmp(str, "128M") == 0)
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amd_iommu_aperture_order = 27;
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if (strcmp(str, "256M") == 0)
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amd_iommu_aperture_order = 28;
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if (strcmp(str, "512M") == 0)
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amd_iommu_aperture_order = 29;
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if (strcmp(str, "1G") == 0)
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amd_iommu_aperture_order = 30;
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}
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return 1;
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}
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__setup("amd_iommu=", parse_amd_iommu_options);
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__setup("amd_iommu_size=", parse_amd_iommu_size_options);
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