Add query for IOMMU support

Reporting whether IOMMU V2 is supported.
IOMMU V1 support is not relevant to user, so not reporting it.

Change-Id: I77389484a87a352da9c2f7b2a5d9de264f90ee53

runtime/hsa-runtime/core/runtime/amd_cpu_agent.cpp

@@ -376,6 +376,9 @@ hsa_status_t CpuAgent::GetInfo(hsa_agent_info_t attribute, void* value) const {
     case HSA_AMD_AGENT_INFO_SDMA_UCODE_VERSION:
       *((uint32_t*)value) = 0;
       break;
+    case HSA_AMD_AGENT_INFO_IOMMU_SUPPORT:
+      *((hsa_amd_iommu_version_t*)value) = HSA_IOMMU_SUPPORT_NONE;
+      break;
     default:
       return HSA_STATUS_ERROR_INVALID_ARGUMENT;
       break;

runtime/hsa-runtime/core/runtime/amd_gpu_agent.cpp

@@ -1111,6 +1111,12 @@ hsa_status_t GpuAgent::GetInfo(hsa_agent_info_t attribute, void* value) const {
     case HSA_AMD_AGENT_INFO_SDMA_UCODE_VERSION:
       *((uint32_t*)value) = static_cast<uint32_t>(properties_.uCodeEngineVersions.uCodeSDMA);
       break;
+    case HSA_AMD_AGENT_INFO_IOMMU_SUPPORT:
+      if (properties_.Capability.ui32.HSAMMUPresent)
+        *((hsa_amd_iommu_version_t*)value) = HSA_IOMMU_SUPPORT_V2;
+      else
+        *((hsa_amd_iommu_version_t*)value) = HSA_IOMMU_SUPPORT_NONE;
+      break;
     default:
       return HSA_STATUS_ERROR_INVALID_ARGUMENT;
       break;