1 // Copyright (C) 2023 The Android Open Source Project 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License") override; 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #pragma once 16 17 #include <atomic> 18 #include <memory> 19 #include <unordered_set> 20 21 #include "DrmDevice.h" 22 #include "aemu/base/Compiler.h" 23 #include "aemu/base/ManagedDescriptor.hpp" 24 25 namespace gfxstream { 26 namespace magma { 27 28 class DrmDevice; 29 30 // Wraps a linux DRM (GEM) buffer. 31 class DrmBuffer { 32 public: 33 ~DrmBuffer(); 34 DISALLOW_COPY_AND_ASSIGN(DrmBuffer); 35 DrmBuffer(DrmBuffer&&) noexcept; 36 DrmBuffer& operator=(DrmBuffer&&) = delete; 37 38 // Creates a new buffer using the provided device. The device must remain valid for the lifetime 39 // of the buffer. 40 static std::unique_ptr<DrmBuffer> create(DrmDevice& device, uint32_t context_id, uint64_t size); 41 42 // Returns the gem handle for the buffer. 43 uint32_t getHandle(); 44 45 // Returns the allocated size of the buffer. 46 uint64_t size(); 47 48 // Returns the host address for the mapped buffer. 49 void* map(); 50 51 // Returns the host-guest shared buffer ID. 52 uint64_t getId(); 53 54 private: 55 DrmBuffer(DrmDevice& device); 56 57 DrmDevice& mDevice; 58 uint32_t mContextId; 59 uint32_t mGemHandle; 60 uint64_t mSize; 61 62 static std::atomic_uint64_t mIdNext; 63 void* mHva = nullptr; 64 uint64_t mId = 0; 65 }; 66 67 } // namespace magma 68 } // namespace gfxstream 69