1 /*
2 * Copyright (C) 2021 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "Service.h"
18
19 #include <AndroidVersionUtil.h>
20 #include <aidl/android/hardware/neuralnetworks/IDevice.h>
21 #include <android/binder_auto_utils.h>
22 #include <android/binder_manager.h>
23 #include <android/binder_process.h>
24
25 #include <nnapi/IDevice.h>
26 #include <nnapi/Result.h>
27 #include <nnapi/Types.h>
28 #include <nnapi/hal/ResilientDevice.h>
29 #include <string>
30
31 #include "Device.h"
32 #include "Utils.h"
33
34 namespace aidl::android::hardware::neuralnetworks::utils {
35 namespace {
36
37 // Map the AIDL version of an IDevice to NNAPI canonical feature level.
getAidlServiceFeatureLevel(IDevice * service)38 nn::GeneralResult<nn::Version> getAidlServiceFeatureLevel(IDevice* service) {
39 CHECK(service != nullptr);
40 int aidlVersion;
41 const auto ret = service->getInterfaceVersion(&aidlVersion);
42 HANDLE_ASTATUS(ret) << "getInterfaceVersion failed";
43
44 // For service AIDL versions greater than or equal to the AIDL library version that the runtime
45 // was built against, clamp it to the runtime AIDL library version.
46 aidlVersion = std::min(aidlVersion, IDevice::version);
47
48 // Map stable AIDL versions to canonical versions.
49 auto version = aidlVersionToCanonicalVersion(aidlVersion);
50 if (!version.has_value()) {
51 return NN_ERROR() << "Unknown AIDL service version: " << aidlVersion;
52 }
53 return version.value();
54 }
55
56 } // namespace
57
getDevice(const std::string & instanceName,::android::nn::Version::Level maxFeatureLevelAllowed)58 nn::GeneralResult<nn::SharedDevice> getDevice(
59 const std::string& instanceName, ::android::nn::Version::Level maxFeatureLevelAllowed) {
60 auto fullName = std::string(IDevice::descriptor) + "/" + instanceName;
61 hal::utils::ResilientDevice::Factory makeDevice =
62 [instanceName, name = std::move(fullName),
63 maxFeatureLevelAllowed](bool blocking) -> nn::GeneralResult<nn::SharedDevice> {
64 std::add_pointer_t<AIBinder*(const char*)> getService;
65 if (blocking) {
66 if (__builtin_available(android __NNAPI_AIDL_MIN_ANDROID_API__, *)) {
67 getService = AServiceManager_waitForService;
68 } else {
69 getService = AServiceManager_getService;
70 }
71 } else {
72 getService = AServiceManager_checkService;
73 }
74
75 auto service = IDevice::fromBinder(ndk::SpAIBinder(getService(name.c_str())));
76 if (service == nullptr) {
77 return NN_ERROR()
78 << (blocking ? "AServiceManager_waitForService (or AServiceManager_getService)"
79 : "AServiceManager_checkService")
80 << " returned nullptr";
81 }
82 ABinderProcess_startThreadPool();
83 auto featureLevel = NN_TRY(getAidlServiceFeatureLevel(service.get()));
84 featureLevel.level = std::min(featureLevel.level, maxFeatureLevelAllowed);
85 return Device::create(instanceName, std::move(service), featureLevel);
86 };
87
88 return hal::utils::ResilientDevice::create(std::move(makeDevice));
89 }
90
91 } // namespace aidl::android::hardware::neuralnetworks::utils
92