Commit ae7877de authored Jun 26, 2008 by Joerg Roedel Committed by Ingo Molnar Jun 27, 2008

x86, AMD IOMMU: add early detection code

This patch adds code to detect an AMD IOMMU early during boot before the early
detection code of other IOMMUs run.

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>

parent fe74c9cf

arch/x86/kernel/amd_iommu_init.c

+20 −0

Original line number	Diff line number	Diff line
		@@ -769,3 +769,23 @@ int __init amd_iommu_init(void)
		goto out;
		}

		static int __init early_amd_iommu_detect(struct acpi_table_header *table)
		{
		return 0;
		}

		void __init amd_iommu_detect(void)
		{
		if (swiotlb \|\| no_iommu \|\| iommu_detected)
		return;

		if (amd_iommu_disable)
		return;

		if (acpi_table_parse("IVRS", early_amd_iommu_detect) == 0) {
		iommu_detected = 1;
		gart_iommu_aperture_disabled = 1;
		gart_iommu_aperture = 0;
		}
		}