Merge "Revert^2 "Provide explicitly versioned NNAPI AIDL utils libs -- HAL.""

1 files changed, 28 insertions, 1 deletions

diff --git a/neuralnetworks/aidl/utils/src/Service.cpp b/neuralnetworks/aidl/utils/src/Service.cpp
index ac182a205e..01772eed53 100644
--- a/neuralnetworks/aidl/utils/src/Service.cpp
+++ b/neuralnetworks/aidl/utils/src/Service.cpp
@@ -17,6 +17,7 @@
 #include "Service.h"
 
 #include <AndroidVersionUtil.h>
+#include <aidl/android/hardware/neuralnetworks/IDevice.h>
 #include <android/binder_auto_utils.h>
 #include <android/binder_manager.h>
 #include <android/binder_process.h>
@@ -28,8 +29,33 @@
 #include <string>
 
 #include "Device.h"
+#include "Utils.h"
 
 namespace aidl::android::hardware::neuralnetworks::utils {
+namespace {
+
+// Map the AIDL version of an IDevice to NNAPI canonical feature level.
+nn::GeneralResult<nn::Version> getAidlServiceFeatureLevel(IDevice* service) {
+    CHECK(service != nullptr);
+    int aidlVersion;
+    const auto ret = service->getInterfaceVersion(&aidlVersion);
+    HANDLE_ASTATUS(ret) << "getInterfaceVersion failed";
+
+    // For service AIDL versions greater than or equal to the AIDL library version that the runtime
+    // was built against, clamp it to the runtime AIDL library version.
+    aidlVersion = std::min(aidlVersion, IDevice::version);
+
+    // Map stable AIDL versions to canonical versions.
+    switch (aidlVersion) {
+        case 1:
+            return nn::Version::ANDROID_S;
+        case 2:
+            return nn::Version::FEATURE_LEVEL_6;
+    }
+    return NN_ERROR() << "Unknown AIDL service version: " << aidlVersion;
+}
+
+}  // namespace
 
 nn::GeneralResult<nn::SharedDevice> getDevice(const std::string& instanceName) {
     auto fullName = std::string(IDevice::descriptor) + "/" + instanceName;
@@ -55,7 +81,8 @@ nn::GeneralResult<nn::SharedDevice> getDevice(const std::string& instanceName) {
                    << " returned nullptr";
         }
         ABinderProcess_startThreadPool();
-        return Device::create(instanceName, std::move(service));
+        const auto featureLevel = NN_TRY(getAidlServiceFeatureLevel(service.get()));
+        return Device::create(instanceName, std::move(service), featureLevel);
     };
 
     return hal::utils::ResilientDevice::create(std::move(makeDevice));