1 /* 2 * Copyright (C) 2016 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 #define LOG_TAG "libhidlmemory" 17 18 #include <map> 19 #include <mutex> 20 #include <string> 21 22 #include <hidlmemory/mapping.h> 23 24 #include <android-base/logging.h> 25 #include <android/hidl/memory/1.0/IMapper.h> 26 #include <hidl/HidlSupport.h> 27 28 using android::sp; 29 using android::hidl::memory::V1_0::IMemory; 30 using android::hidl::memory::V1_0::IMapper; 31 32 namespace android { 33 namespace hardware { 34 35 static std::map<std::string, sp<IMapper>> gMappersByName; 36 static std::mutex gMutex; 37 getMapperService(const std::string & name)38static inline sp<IMapper> getMapperService(const std::string& name) { 39 std::unique_lock<std::mutex> _lock(gMutex); 40 auto iter = gMappersByName.find(name); 41 if (iter != gMappersByName.end()) { 42 return iter->second; 43 } 44 45 sp<IMapper> mapper = IMapper::getService(name, true /* getStub */); 46 if (mapper != nullptr) { 47 gMappersByName[name] = mapper; 48 } 49 return mapper; 50 } 51 mapMemory(const hidl_memory & memory)52sp<IMemory> mapMemory(const hidl_memory& memory) { 53 54 sp<IMapper> mapper = getMapperService(memory.name()); 55 56 if (mapper == nullptr) { 57 LOG(FATAL) << "Could not fetch mapper for " << memory.name() << " shared memory"; 58 } 59 60 if (mapper->isRemote()) { 61 LOG(FATAL) << "IMapper must be a passthrough service."; 62 } 63 64 Return<sp<IMemory>> ret = mapper->mapMemory(memory); 65 66 if (!ret.isOk()) { 67 LOG(FATAL) << "hidl_memory map returned transport error."; 68 } 69 70 return ret; 71 } 72 73 } // namespace hardware 74 } // namespace android 75