| // Copyright 2019 The Dawn & Tint Authors |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are met: |
| // |
| // 1. Redistributions of source code must retain the above copyright notice, this |
| // list of conditions and the following disclaimer. |
| // |
| // 2. Redistributions in binary form must reproduce the above copyright notice, |
| // this list of conditions and the following disclaimer in the documentation |
| // and/or other materials provided with the distribution. |
| // |
| // 3. Neither the name of the copyright holder nor the names of its |
| // contributors may be used to endorse or promote products derived from |
| // this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE |
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #ifndef SRC_DAWN_NATIVE_BUDDYMEMORYALLOCATOR_H_ |
| #define SRC_DAWN_NATIVE_BUDDYMEMORYALLOCATOR_H_ |
| |
| #include <memory> |
| #include <vector> |
| |
| #include "dawn/native/BuddyAllocator.h" |
| #include "dawn/native/Error.h" |
| #include "dawn/native/ResourceMemoryAllocation.h" |
| #include "partition_alloc/pointers/raw_ptr.h" |
| |
| namespace dawn::native { |
| |
| class ResourceHeapAllocator; |
| |
| // BuddyMemoryAllocator uses the buddy allocator to sub-allocate blocks of device |
| // memory created by MemoryAllocator clients. It creates a very large buddy system |
| // where backing device memory blocks equal a specified level in the system. |
| // |
| // Upon sub-allocating, the offset gets mapped to device memory by computing the corresponding |
| // memory index and should the memory not exist, it is created. If two sub-allocations share the |
| // same memory index, the memory refcount is incremented to ensure de-allocating one doesn't |
| // release the other prematurely. |
| // |
| // The MemoryAllocator should return ResourceHeaps that are all compatible with each other. |
| // It should also outlive all the resources that are in the buddy allocator. |
| class BuddyMemoryAllocator { |
| public: |
| BuddyMemoryAllocator(uint64_t maxSystemSize, |
| uint64_t memoryBlockSize, |
| ResourceHeapAllocator* heapAllocator); |
| ~BuddyMemoryAllocator(); |
| |
| ResultOrError<ResourceMemoryAllocation> Allocate(uint64_t allocationSize, uint64_t alignment); |
| void Deallocate(const ResourceMemoryAllocation& allocation); |
| |
| uint64_t GetMemoryBlockSize() const; |
| |
| // For testing purposes. |
| uint64_t ComputeTotalNumOfHeapsForTesting() const; |
| |
| private: |
| uint64_t GetMemoryIndex(uint64_t offset) const; |
| |
| uint64_t mMemoryBlockSize = 0; |
| |
| BuddyAllocator mBuddyBlockAllocator; |
| raw_ptr<ResourceHeapAllocator> mHeapAllocator; |
| |
| struct TrackedSubAllocations { |
| size_t refcount = 0; |
| std::unique_ptr<ResourceHeapBase> mMemoryAllocation; |
| }; |
| |
| std::vector<TrackedSubAllocations> mTrackedSubAllocations; |
| }; |
| |
| } // namespace dawn::native |
| |
| #endif // SRC_DAWN_NATIVE_BUDDYMEMORYALLOCATOR_H_ |