Enable NN VTS and utility code to use lazy services

This CL enables VtsHalNeuralnetworksTargetTest to use lazy services by
changing from AServiceManager_getService (which will return nullptr for
the service if the service is not able to be loaded within a short
amount of time) to AServiceManager_waitForService (which will wait for a
longer time, allowing lazy services to start up).

Similarly, the utility code is changed from using
AServiceManager_getService to AServiceManager_waitForService where
possible.

This CL also introduces an "InvalidDevice" utility class to the
nnapi/hal/aidl utility code. InvalidDevices are minimal devices that
support no functionality but are still able to pass VTS tests.

Bug: 170696939
Test: mma
Test: VtsHalNeuralnetworksTargetTest
Change-Id: I4f806b104ef6af863ec55c2c3f2a2dd1f72b9633

1 files changed, 16 insertions, 5 deletions

diff --git a/neuralnetworks/aidl/utils/src/Service.cpp b/neuralnetworks/aidl/utils/src/Service.cpp
index 511de559a6..ac182a205e 100644
--- a/neuralnetworks/aidl/utils/src/Service.cpp
+++ b/neuralnetworks/aidl/utils/src/Service.cpp
@@ -16,6 +16,7 @@
 
 #include "Service.h"
 
+#include <AndroidVersionUtil.h>
 #include <android/binder_auto_utils.h>
 #include <android/binder_manager.h>
 #include <android/binder_process.h>
@@ -35,13 +36,23 @@ nn::GeneralResult<nn::SharedDevice> getDevice(const std::string& instanceName) {
     hal::utils::ResilientDevice::Factory makeDevice =
             [instanceName,
              name = std::move(fullName)](bool blocking) -> nn::GeneralResult<nn::SharedDevice> {
-        const auto& getService =
-                blocking ? AServiceManager_getService : AServiceManager_checkService;
+        std::add_pointer_t<AIBinder*(const char*)> getService;
+        if (blocking) {
+            if (__builtin_available(android __NNAPI_AIDL_MIN_ANDROID_API__, *)) {
+                getService = AServiceManager_waitForService;
+            } else {
+                getService = AServiceManager_getService;
+            }
+        } else {
+            getService = AServiceManager_checkService;
+        }
+
         auto service = IDevice::fromBinder(ndk::SpAIBinder(getService(name.c_str())));
         if (service == nullptr) {
-            return NN_ERROR() << (blocking ? "AServiceManager_getService"
-                                           : "AServiceManager_checkService")
-                              << " returned nullptr";
+            return NN_ERROR()
+                   << (blocking ? "AServiceManager_waitForService (or AServiceManager_getService)"
+                                : "AServiceManager_checkService")
+                   << " returned nullptr";
         }
         ABinderProcess_startThreadPool();
         return Device::create(instanceName, std::move(service));