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 "SupportLibrary.h"
18
19 #include <android-base/logging.h>
20
21 #include <dlfcn.h>
22
23 #include <cstring>
24 #include <memory>
25 #include <string>
26
NnApiSupportLibrary(const NnApiSLDriverImplFL5 & impl,void * libHandle)27 NnApiSupportLibrary::NnApiSupportLibrary(const NnApiSLDriverImplFL5& impl, void* libHandle)
28 : NnApiSLDriverImplFL5(impl), libHandle(libHandle) {
29 base.implFeatureLevel = ANEURALNETWORKS_FEATURE_LEVEL_5;
30 }
31
~NnApiSupportLibrary()32 NnApiSupportLibrary::~NnApiSupportLibrary() {
33 if (libHandle != nullptr) {
34 dlclose(libHandle);
35 libHandle = nullptr;
36 }
37 }
38
loadNnApiSupportLibrary(const std::string & libName)39 std::unique_ptr<const NnApiSupportLibrary> loadNnApiSupportLibrary(const std::string& libName) {
40 void* libHandle = dlopen(libName.c_str(), RTLD_LAZY | RTLD_LOCAL);
41 if (libHandle == nullptr) {
42 LOG(ERROR) << "nnapi error: unable to open library " << libName.c_str() << " " << dlerror();
43 return nullptr;
44 }
45
46 auto result = loadNnApiSupportLibrary(libHandle);
47 if (!result) {
48 dlclose(libHandle);
49 }
50 return result;
51 }
52
loadNnApiSupportLibrary(void * libHandle)53 std::unique_ptr<const NnApiSupportLibrary> loadNnApiSupportLibrary(void* libHandle) {
54 NnApiSLDriverImpl* (*getSlDriverImpl)();
55 getSlDriverImpl = reinterpret_cast<decltype(getSlDriverImpl)>(
56 dlsym(libHandle, "ANeuralNetworks_getSLDriverImpl"));
57 if (getSlDriverImpl == nullptr) {
58 LOG(ERROR) << "Failed to find ANeuralNetworks_getSLDriverImpl symbol";
59 return nullptr;
60 }
61
62 NnApiSLDriverImpl* impl = getSlDriverImpl();
63 if (impl == nullptr) {
64 LOG(ERROR) << "ANeuralNetworks_getSLDriverImpl returned nullptr";
65 return nullptr;
66 }
67
68 if (impl->implFeatureLevel != ANEURALNETWORKS_FEATURE_LEVEL_5) {
69 LOG(ERROR) << "Unsupported NnApiSLDriverImpl->implFeatureLevel: " << impl->implFeatureLevel;
70 return nullptr;
71 }
72
73 return std::make_unique<NnApiSupportLibrary>(*reinterpret_cast<NnApiSLDriverImplFL5*>(impl),
74 libHandle);
75 }
76