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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>
This commit is contained in:
Joerg Roedel 2008-06-26 21:27:52 +02:00 committed by Ingo Molnar
parent ae7877de9c
commit 918ad6c54d
1 changed files with 34 additions and 0 deletions
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34
arch/x86/kernel/amd_iommu_init.c
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@ -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);