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Commit 918ad6c5 authored by Joerg Roedel's avatar Joerg Roedel Committed by Ingo Molnar
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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: default avatarJoerg 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: default avatarIngo Molnar <mingo@elte.hu>
parent ae7877de

arch/x86/kernel/amd_iommu_init.c

+34 −0
Original line number Diff line number Diff line
@@ -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);