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Implement access-driven Buffer synchronization

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Similar to constant redundant synchronization for textures, there is a lot of redundant synchronization of buffers. Albeit, buffer synchronization is far cheaper than texture synchronization it still has associated costs which have now been reduced by only synchronizing on access.
This commit is contained in:
PixelyIon
2022-03-06 21:07:37 +05:30
parent 7532eaf050
commit 881bb969c4
3 changed files with 79 additions and 28 deletions
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78
app/src/main/cpp/skyline/gpu/buffer.cpp
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@ -45,20 +45,39 @@ namespace skyline::gpu {
alignedMirror = gpu.state.process->memory.CreateMirrors(alignedMappings);
mirror = alignedMirror.subspan(static_cast<size_t>(frontMapping.data() - alignedData), totalSize);
}
trapHandle = gpu.state.nce->TrapRegions(mappings, true, [this] {
std::lock_guard lock(*this);
SynchronizeGuest(true); // We can skip trapping since the caller will do it
WaitOnFence();
}, [this] {
std::lock_guard lock(*this);
SynchronizeGuest(true);
dirtyState = DirtyState::CpuDirty; // We need to assume the buffer is dirty since we don't know what the guest is writing
WaitOnFence();
});
}
Buffer::Buffer(GPU &gpu, GuestBuffer guest) : gpu(gpu), size(guest.BufferSize()), backing(gpu.memory.AllocateBuffer(size)), guest(std::move(guest)) {
SetupGuestMappings();
SynchronizeHost();
}
Buffer::~Buffer() {
std::lock_guard lock(*this);
if (trapHandle)
gpu.state.nce->DeleteTrap(*trapHandle);
SynchronizeGuest(true);
if (alignedMirror.valid())
munmap(alignedMirror.data(), alignedMirror.size());
}
void Buffer::MarkGpuDirty() {
if (dirtyState == DirtyState::GpuDirty)
return;
gpu.state.nce->RetrapRegions(*trapHandle, false);
dirtyState = DirtyState::GpuDirty;
}
void Buffer::WaitOnFence() {
TRACE_EVENT("gpu", "Buffer::WaitOnFence");
@ -69,44 +88,58 @@ namespace skyline::gpu {
}
}
void Buffer::SynchronizeHost() {
void Buffer::SynchronizeHost(bool rwTrap) {
if (dirtyState != DirtyState::CpuDirty)
return; // If the buffer has not been modified on the CPU, there is no need to synchronize it
WaitOnFence();
TRACE_EVENT("gpu", "Buffer::SynchronizeHost");
auto host{backing.data()};
for (auto &mapping : guest.mappings) {
auto mappingSize{mapping.size_bytes()};
std::memcpy(host, mapping.data(), mappingSize);
host += mappingSize;
std::memcpy(backing.data(), mirror.data(), mirror.size());
if (rwTrap) {
gpu.state.nce->RetrapRegions(*trapHandle, false);
dirtyState = DirtyState::GpuDirty;
} else {
gpu.state.nce->RetrapRegions(*trapHandle, true);
dirtyState = DirtyState::Clean;
}
}
void Buffer::SynchronizeHostWithCycle(const std::shared_ptr<FenceCycle> &pCycle) {
void Buffer::SynchronizeHostWithCycle(const std::shared_ptr<FenceCycle> &pCycle, bool rwTrap) {
if (dirtyState != DirtyState::CpuDirty)
return;
if (pCycle != cycle.lock())
WaitOnFence();
TRACE_EVENT("gpu", "Buffer::SynchronizeHostWithCycle");
auto host{backing.data()};
for (auto &mapping : guest.mappings) {
auto mappingSize{mapping.size_bytes()};
std::memcpy(host, mapping.data(), mappingSize);
host += mappingSize;
std::memcpy(backing.data(), mirror.data(), mirror.size());
if (rwTrap) {
gpu.state.nce->RetrapRegions(*trapHandle, false);
dirtyState = DirtyState::GpuDirty;
} else {
gpu.state.nce->RetrapRegions(*trapHandle, true);
dirtyState = DirtyState::Clean;
}
}
void Buffer::SynchronizeGuest() {
void Buffer::SynchronizeGuest(bool skipTrap) {
if (dirtyState != DirtyState::GpuDirty)
return; // If the buffer has not been used on the GPU, there is no need to synchronize it
WaitOnFence();
TRACE_EVENT("gpu", "Buffer::SynchronizeGuest");
auto host{backing.data()};
for (auto &mapping : guest.mappings) {
auto mappingSize{mapping.size_bytes()};
std::memcpy(mapping.data(), host, mappingSize);
host += mappingSize;
}
std::memcpy(mirror.data(), backing.data(), mirror.size());
if (!skipTrap)
gpu.state.nce->RetrapRegions(*trapHandle, true);
dirtyState = DirtyState::Clean;
}
/**
@ -132,7 +165,10 @@ namespace skyline::gpu {
}
void Buffer::Write(span<u8> data, vk::DeviceSize offset) {
std::memcpy(mirror.data() + offset, data.data(), data.size());
if (dirtyState == DirtyState::CpuDirty || dirtyState == DirtyState::Clean)
std::memcpy(mirror.data() + offset, data.data(), data.size());
if (dirtyState == DirtyState::GpuDirty || dirtyState == DirtyState::Clean)
std::memcpy(backing.data() + offset, data.data(), data.size());
}
std::shared_ptr<BufferView> Buffer::GetView(vk::DeviceSize offset, vk::DeviceSize range, vk::Format format) {