x86, AMD IOMMU: initialize dma_ops from IOMMU initialization and enable IOMMUs

This patch adds a call to the driver specific dma_ops initialization routine
from the AMD IOMMU hardware initialization. Further it adds the necessary code
to finally enable AMD IOMMU hardware.

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>

arch/x86/kernel/amd_iommu_init.c

@@ -644,6 +644,16 @@ static int __init init_memory_definitions(struct acpi_table_header *table)
 	return 0;
 }
 
+static void __init enable_iommus(void)
+{
+	struct amd_iommu *iommu;
+
+	list_for_each_entry(iommu, &amd_iommu_list, list) {
+		iommu_set_exclusion_range(iommu);
+		iommu_enable(iommu);
+	}
+}
+
 int __init amd_iommu_init(void)
 {
 	int i, ret = 0;
@@ -731,6 +741,12 @@ int __init amd_iommu_init(void)
 	if (acpi_table_parse("IVRS", init_memory_definitions) != 0)
 		goto free;
 
+	ret = amd_iommu_init_dma_ops();
+	if (ret)
+		goto free;
+
+	enable_iommus();
+
 	printk(KERN_INFO "AMD IOMMU: aperture size is %d MB\n",
 			(1 << (amd_iommu_aperture_order-20)));