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// 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.
#include "dawn/native/BuddyMemoryAllocator.h"
#include <utility>
#include "dawn/common/Math.h"
#include "dawn/native/ResourceHeapAllocator.h"
namespace dawn::native {
BuddyMemoryAllocator::BuddyMemoryAllocator(uint64_t maxSystemSize,
uint64_t memoryBlockSize,
ResourceHeapAllocator* heapAllocator)
: mMemoryBlockSize(memoryBlockSize),
mBuddyBlockAllocator(maxSystemSize),
mHeapAllocator(heapAllocator) {
DAWN_ASSERT(memoryBlockSize <= maxSystemSize);
DAWN_ASSERT(IsPowerOfTwo(mMemoryBlockSize));
DAWN_ASSERT(maxSystemSize % mMemoryBlockSize == 0);
mTrackedSubAllocations.resize(maxSystemSize / mMemoryBlockSize);
}
BuddyMemoryAllocator::~BuddyMemoryAllocator() = default;
uint64_t BuddyMemoryAllocator::GetMemoryIndex(uint64_t offset) const {
DAWN_ASSERT(offset != BuddyAllocator::kInvalidOffset);
return offset / mMemoryBlockSize;
}
ResultOrError<ResourceMemoryAllocation> BuddyMemoryAllocator::Allocate(uint64_t allocationSize,
uint64_t alignment) {
ResourceMemoryAllocation invalidAllocation = ResourceMemoryAllocation{};
if (allocationSize == 0) {
return std::move(invalidAllocation);
}
// Check the unaligned size to avoid overflowing NextPowerOfTwo.
if (allocationSize > mMemoryBlockSize) {
return std::move(invalidAllocation);
}
// Round allocation size to nearest power-of-two.
allocationSize = NextPowerOfTwo(allocationSize);
// Allocation cannot exceed the memory size.
if (allocationSize > mMemoryBlockSize) {
return std::move(invalidAllocation);
}
// Attempt to sub-allocate a block of the requested size.
const uint64_t blockOffset = mBuddyBlockAllocator.Allocate(allocationSize, alignment);
if (blockOffset == BuddyAllocator::kInvalidOffset) {
return std::move(invalidAllocation);
}
const uint64_t memoryIndex = GetMemoryIndex(blockOffset);
if (mTrackedSubAllocations[memoryIndex].refcount == 0) {
// Transfer ownership to this allocator
std::unique_ptr<ResourceHeapBase> memory;
DAWN_TRY_ASSIGN(memory, mHeapAllocator->AllocateResourceHeap(mMemoryBlockSize));
mTrackedSubAllocations[memoryIndex] = {/*refcount*/ 0, std::move(memory)};
}
mTrackedSubAllocations[memoryIndex].refcount++;
AllocationInfo info;
info.mBlockOffset = blockOffset;
info.mMethod = AllocationMethod::kSubAllocated;
// Allocation offset is always local to the memory.
const uint64_t memoryOffset = blockOffset % mMemoryBlockSize;
return ResourceMemoryAllocation{info, memoryOffset,
mTrackedSubAllocations[memoryIndex].mMemoryAllocation.get()};
}
void BuddyMemoryAllocator::Deallocate(const ResourceMemoryAllocation& allocation) {
const AllocationInfo info = allocation.GetInfo();
DAWN_ASSERT(info.mMethod == AllocationMethod::kSubAllocated);
const uint64_t memoryIndex = GetMemoryIndex(info.mBlockOffset);
DAWN_ASSERT(mTrackedSubAllocations[memoryIndex].refcount > 0);
mTrackedSubAllocations[memoryIndex].refcount--;
if (mTrackedSubAllocations[memoryIndex].refcount == 0) {
mHeapAllocator->DeallocateResourceHeap(
std::move(mTrackedSubAllocations[memoryIndex].mMemoryAllocation));
}
mBuddyBlockAllocator.Deallocate(info.mBlockOffset);
}
uint64_t BuddyMemoryAllocator::GetMemoryBlockSize() const {
return mMemoryBlockSize;
}
uint64_t BuddyMemoryAllocator::ComputeTotalNumOfHeapsForTesting() const {
uint64_t count = 0;
for (const TrackedSubAllocations& allocation : mTrackedSubAllocations) {
if (allocation.refcount > 0) {
count++;
}
}
return count;
}
} // namespace dawn::native