x86, AMD IOMMU: add dma_ops initialization function

This patch adds the function to initialize the dma_ops for 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.c b/arch/x86/kernel/amd_iommu.c
index bed5f820898ddfa68c3c9a8a9d3bbc76b7668b94..c282bdec1650e076796053758487640a052e89bc 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -906,3 +906,49 @@ void prealloc_protection_domains(void)
        }
 }
 
+static struct dma_mapping_ops amd_iommu_dma_ops = {
+       .alloc_coherent = alloc_coherent,
+       .free_coherent = free_coherent,
+       .map_single = map_single,
+       .unmap_single = unmap_single,
+       .map_sg = map_sg,
+       .unmap_sg = unmap_sg,
+};
+
+int __init amd_iommu_init_dma_ops(void)
+{
+       struct amd_iommu *iommu;
+       int order = amd_iommu_aperture_order;
+       int ret;
+
+       list_for_each_entry(iommu, &amd_iommu_list, list) {
+               iommu->default_dom = dma_ops_domain_alloc(iommu, order);
+               if (iommu->default_dom == NULL)
+                       return -ENOMEM;
+               ret = iommu_init_unity_mappings(iommu);
+               if (ret)
+                       goto free_domains;
+       }
+
+       if (amd_iommu_isolate)
+               prealloc_protection_domains();
+
+       iommu_detected = 1;
+       force_iommu = 1;
+       bad_dma_address = 0;
+       gart_iommu_aperture_disabled = 1;
+       gart_iommu_aperture = 0;
+
+       dma_ops = &amd_iommu_dma_ops;
+
+       return 0;
+
+free_domains:
+
+       list_for_each_entry(iommu, &amd_iommu_list, list) {
+               if (iommu->default_dom)
+                       dma_ops_domain_free(iommu->default_dom);
+       }
+
+       return ret;
+}