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// Copyright 2019 The Dawn Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "dawn_native/vulkan/ResourceMemoryAllocatorVk.h"
#include "common/Math.h"
#include "dawn_native/BuddyMemoryAllocator.h"
#include "dawn_native/ResourceHeapAllocator.h"
#include "dawn_native/vulkan/DeviceVk.h"
#include "dawn_native/vulkan/FencedDeleter.h"
#include "dawn_native/vulkan/ResourceHeapVk.h"
#include "dawn_native/vulkan/VulkanError.h"
namespace dawn::native::vulkan {
namespace {
// TODO(crbug.com/dawn/849): This is a hardcoded heurstic to choose when to
// suballocate but it should ideally depend on the size of the memory heaps and other
// factors.
constexpr uint64_t kMaxSizeForSubAllocation = 4ull * 1024ull * 1024ull; // 4MiB
// Have each bucket of the buddy system allocate at least some resource of the maximum
// size
constexpr uint64_t kBuddyHeapsSize = 2 * kMaxSizeForSubAllocation;
} // anonymous namespace
// SingleTypeAllocator is a combination of a BuddyMemoryAllocator and its client and can
// service suballocation requests, but for a single Vulkan memory type.
class ResourceMemoryAllocator::SingleTypeAllocator : public ResourceHeapAllocator {
public:
SingleTypeAllocator(Device* device, size_t memoryTypeIndex, VkDeviceSize memoryHeapSize)
: mDevice(device),
mMemoryTypeIndex(memoryTypeIndex),
mMemoryHeapSize(memoryHeapSize),
mPooledMemoryAllocator(this),
mBuddySystem(
// Round down to a power of 2 that's <= mMemoryHeapSize. This will always
// be a multiple of kBuddyHeapsSize because kBuddyHeapsSize is a power of 2.
uint64_t(1) << Log2(mMemoryHeapSize),
// Take the min in the very unlikely case the memory heap is tiny.
std::min(uint64_t(1) << Log2(mMemoryHeapSize), kBuddyHeapsSize),
&mPooledMemoryAllocator) {
ASSERT(IsPowerOfTwo(kBuddyHeapsSize));
}
~SingleTypeAllocator() override = default;
void DestroyPool() {
mPooledMemoryAllocator.DestroyPool();
}
ResultOrError<ResourceMemoryAllocation> AllocateMemory(uint64_t size, uint64_t alignment) {
return mBuddySystem.Allocate(size, alignment);
}
void DeallocateMemory(const ResourceMemoryAllocation& allocation) {
mBuddySystem.Deallocate(allocation);
}
// Implementation of the MemoryAllocator interface to be a client of BuddyMemoryAllocator
ResultOrError<std::unique_ptr<ResourceHeapBase>> AllocateResourceHeap(
uint64_t size) override {
if (size > mMemoryHeapSize) {
return DAWN_OUT_OF_MEMORY_ERROR("Allocation size too large");
}
VkMemoryAllocateInfo allocateInfo;
allocateInfo.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
allocateInfo.pNext = nullptr;
allocateInfo.allocationSize = size;
allocateInfo.memoryTypeIndex = mMemoryTypeIndex;
VkDeviceMemory allocatedMemory = VK_NULL_HANDLE;
// First check OOM that we want to surface to the application.
DAWN_TRY(CheckVkOOMThenSuccess(
mDevice->fn.AllocateMemory(mDevice->GetVkDevice(), &allocateInfo, nullptr,
&*allocatedMemory),
"vkAllocateMemory"));
ASSERT(allocatedMemory != VK_NULL_HANDLE);
return {std::make_unique<ResourceHeap>(allocatedMemory, mMemoryTypeIndex)};
}
void DeallocateResourceHeap(std::unique_ptr<ResourceHeapBase> allocation) override {
mDevice->GetFencedDeleter()->DeleteWhenUnused(ToBackend(allocation.get())->GetMemory());
}
private:
Device* mDevice;
size_t mMemoryTypeIndex;
VkDeviceSize mMemoryHeapSize;
PooledResourceMemoryAllocator mPooledMemoryAllocator;
BuddyMemoryAllocator mBuddySystem;
};
// Implementation of ResourceMemoryAllocator
ResourceMemoryAllocator::ResourceMemoryAllocator(Device* device) : mDevice(device) {
const VulkanDeviceInfo& info = mDevice->GetDeviceInfo();
mAllocatorsPerType.reserve(info.memoryTypes.size());
for (size_t i = 0; i < info.memoryTypes.size(); i++) {
mAllocatorsPerType.emplace_back(std::make_unique<SingleTypeAllocator>(
mDevice, i, info.memoryHeaps[info.memoryTypes[i].heapIndex].size));
}
}
ResourceMemoryAllocator::~ResourceMemoryAllocator() = default;
ResultOrError<ResourceMemoryAllocation> ResourceMemoryAllocator::Allocate(
const VkMemoryRequirements& requirements,
MemoryKind kind) {
// The Vulkan spec guarantees at least on memory type is valid.
int memoryType = FindBestTypeIndex(requirements, kind);
ASSERT(memoryType >= 0);
VkDeviceSize size = requirements.size;
// Sub-allocate non-mappable resources because at the moment the mapped pointer
// is part of the resource and not the heap, which doesn't match the Vulkan model.
// TODO(crbug.com/dawn/849): allow sub-allocating mappable resources, maybe.
if (requirements.size < kMaxSizeForSubAllocation && kind != MemoryKind::LinearMappable) {
// When sub-allocating, Vulkan requires that we respect bufferImageGranularity. Some
// hardware puts information on the memory's page table entry and allocating a linear
// resource in the same page as a non-linear (aka opaque) resource can cause issues.
// Probably because some texture compression flags are stored on the page table entry,
// and allocating a linear resource removes these flags.
//
// Anyway, just to be safe we ask that all sub-allocated resources are allocated with at
// least this alignment. TODO(crbug.com/dawn/849): this is suboptimal because multiple
// linear (resp. opaque) resources can coexist in the same page. In particular Nvidia
// GPUs often use a granularity of 64k which will lead to a lot of wasted spec. Revisit
// with a more efficient algorithm later.
uint64_t alignment =
std::max(requirements.alignment,
mDevice->GetDeviceInfo().properties.limits.bufferImageGranularity);
ResourceMemoryAllocation subAllocation;
DAWN_TRY_ASSIGN(subAllocation, mAllocatorsPerType[memoryType]->AllocateMemory(
requirements.size, alignment));
if (subAllocation.GetInfo().mMethod != AllocationMethod::kInvalid) {
return std::move(subAllocation);
}
}
// If sub-allocation failed, allocate memory just for it.
std::unique_ptr<ResourceHeapBase> resourceHeap;
DAWN_TRY_ASSIGN(resourceHeap, mAllocatorsPerType[memoryType]->AllocateResourceHeap(size));
void* mappedPointer = nullptr;
if (kind == MemoryKind::LinearMappable) {
DAWN_TRY_WITH_CLEANUP(
CheckVkSuccess(mDevice->fn.MapMemory(mDevice->GetVkDevice(),
ToBackend(resourceHeap.get())->GetMemory(), 0,
size, 0, &mappedPointer),
"vkMapMemory"),
{
mAllocatorsPerType[memoryType]->DeallocateResourceHeap(std::move(resourceHeap));
});
}
AllocationInfo info;
info.mMethod = AllocationMethod::kDirect;
return ResourceMemoryAllocation(info, /*offset*/ 0, resourceHeap.release(),
static_cast<uint8_t*>(mappedPointer));
}
void ResourceMemoryAllocator::Deallocate(ResourceMemoryAllocation* allocation) {
switch (allocation->GetInfo().mMethod) {
// Some memory allocation can never be initialized, for example when wrapping
// swapchain VkImages with a Texture.
case AllocationMethod::kInvalid:
break;
// For direct allocation we can put the memory for deletion immediately and the fence
// deleter will make sure the resources are freed before the memory.
case AllocationMethod::kDirect: {
ResourceHeap* heap = ToBackend(allocation->GetResourceHeap());
allocation->Invalidate();
mDevice->GetFencedDeleter()->DeleteWhenUnused(heap->GetMemory());
delete heap;
break;
}
// Suballocations aren't freed immediately, otherwise another resource allocation could
// happen just after that aliases the old one and would require a barrier.
// TODO(crbug.com/dawn/851): Maybe we can produce the correct barriers to reduce the
// latency to reclaim memory.
case AllocationMethod::kSubAllocated:
mSubAllocationsToDelete.Enqueue(*allocation, mDevice->GetPendingCommandSerial());
break;
default:
UNREACHABLE();
break;
}
// Invalidate the underlying resource heap in case the client accidentally
// calls DeallocateMemory again using the same allocation.
allocation->Invalidate();
}
void ResourceMemoryAllocator::Tick(ExecutionSerial completedSerial) {
for (const ResourceMemoryAllocation& allocation :
mSubAllocationsToDelete.IterateUpTo(completedSerial)) {
ASSERT(allocation.GetInfo().mMethod == AllocationMethod::kSubAllocated);
size_t memoryType = ToBackend(allocation.GetResourceHeap())->GetMemoryType();
mAllocatorsPerType[memoryType]->DeallocateMemory(allocation);
}
mSubAllocationsToDelete.ClearUpTo(completedSerial);
}
int ResourceMemoryAllocator::FindBestTypeIndex(VkMemoryRequirements requirements,
MemoryKind kind) {
const VulkanDeviceInfo& info = mDevice->GetDeviceInfo();
bool mappable = kind == MemoryKind::LinearMappable;
// Find a suitable memory type for this allocation
int bestType = -1;
for (size_t i = 0; i < info.memoryTypes.size(); ++i) {
// Resource must support this memory type
if ((requirements.memoryTypeBits & (1 << i)) == 0) {
continue;
}
// Mappable resource must be host visible
if (mappable &&
(info.memoryTypes[i].propertyFlags & VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT) == 0) {
continue;
}
// Mappable must also be host coherent.
if (mappable &&
(info.memoryTypes[i].propertyFlags & VK_MEMORY_PROPERTY_HOST_COHERENT_BIT) == 0) {
continue;
}
// Found the first candidate memory type
if (bestType == -1) {
bestType = static_cast<int>(i);
continue;
}
// For non-mappable resources, favor device local memory.
bool currentDeviceLocal =
info.memoryTypes[i].propertyFlags & VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;
bool bestDeviceLocal =
info.memoryTypes[bestType].propertyFlags & VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;
if (!mappable && (currentDeviceLocal != bestDeviceLocal)) {
if (currentDeviceLocal) {
bestType = static_cast<int>(i);
}
continue;
}
// All things equal favor the memory in the biggest heap
VkDeviceSize bestTypeHeapSize =
info.memoryHeaps[info.memoryTypes[bestType].heapIndex].size;
VkDeviceSize candidateHeapSize = info.memoryHeaps[info.memoryTypes[i].heapIndex].size;
if (candidateHeapSize > bestTypeHeapSize) {
bestType = static_cast<int>(i);
continue;
}
}
return bestType;
}
void ResourceMemoryAllocator::DestroyPool() {
for (auto& alloc : mAllocatorsPerType) {
alloc->DestroyPool();
}
}
} // namespace dawn::native::vulkan