iommu: Add IOMMU index concept to IOMMU API

If an IOMMU supports mappings that care about the memory
transaction attributes, then it no longer has a unique
address -> output mapping, but more than one. We can
represent these using an IOMMU index, analogous to TCG's
mmu indexes.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-id: 20180604152941.20374-2-peter.maydell@linaro.org

1 files changed, 23 insertions, 0 deletions

diff --git a/memory.c b/memory.c
index 3212acc7f4..64f4a55d54 100644
--- a/memory.c
+++ b/memory.c
@@ -1915,6 +1915,29 @@ int memory_region_iommu_get_attr(IOMMUMemoryRegion *iommu_mr,
     return imrc->get_attr(iommu_mr, attr, data);
 }
 
+int memory_region_iommu_attrs_to_index(IOMMUMemoryRegion *iommu_mr,
+                                       MemTxAttrs attrs)
+{
+    IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_GET_CLASS(iommu_mr);
+
+    if (!imrc->attrs_to_index) {
+        return 0;
+    }
+
+    return imrc->attrs_to_index(iommu_mr, attrs);
+}
+
+int memory_region_iommu_num_indexes(IOMMUMemoryRegion *iommu_mr)
+{
+    IOMMUMemoryRegionClass *imrc = IOMMU_MEMORY_REGION_GET_CLASS(iommu_mr);
+
+    if (!imrc->num_indexes) {
+        return 1;
+    }
+
+    return imrc->num_indexes(iommu_mr);
+}
+
 void memory_region_set_log(MemoryRegion *mr, bool log, unsigned client)
 {
     uint8_t mask = 1 << client;