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>
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 @@
}
}
+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);