[PATCH 15/34] AMD IOMMU: add early detection code

[Joerg Roedel]

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@xxxxxxx>
---
 arch/x86/kernel/amd_iommu_init.c |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index c792ddc..d7a75bf 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -769,3 +769,23 @@ free:
 	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;
+	}
+}
+
-- 
1.5.3.7


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