// Copyright 2020 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <algorithm>
#include <array>
#include <cstring>
#include <iterator>
#include <list>
#include <memory>
#include <mutex>
#include <optional>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include "common/assert.h"
#include "common/settings.h"
#include "core/core.h"
#include "video_core/engines/maxwell_3d.h"
#include "video_core/gpu.h"
#include "video_core/memory_manager.h"
#include "video_core/rasterizer_interface.h"
namespace VideoCommon {
template <class QueryCache, class HostCounter>
class CounterStreamBase {
public:
explicit CounterStreamBase(QueryCache& cache_, VideoCore::QueryType type_)
: cache{cache_}, type{type_} {}
/// Updates the state of the stream, enabling or disabling as needed.
void Update(bool enabled) {
if (enabled) {
Enable();
} else {
Disable();
}
}
/// Resets the stream to zero. It doesn't disable the query after resetting.
void Reset() {
if (current) {
current->EndQuery();
// Immediately start a new query to avoid disabling its state.
current = cache.Counter(nullptr, type);
}
last = nullptr;
}
/// Returns the current counter slicing as needed.
std::shared_ptr<HostCounter> Current() {
if (!current) {
return nullptr;
}
current->EndQuery();
last = std::move(current);
current = cache.Counter(last, type);
return last;
}
/// Returns true when the counter stream is enabled.
bool IsEnabled() const {
return current != nullptr;
}
private:
/// Enables the stream.
void Enable() {
if (current) {
return;
}
current = cache.Counter(last, type);
}
// Disables the stream.
void Disable() {
if (current) {
current->EndQuery();
}
last = std::exchange(current, nullptr);
}
QueryCache& cache;
const VideoCore::QueryType type;
std::shared_ptr<HostCounter> current;
std::shared_ptr<HostCounter> last;
};
template <class QueryCache, class CachedQuery, class CounterStream, class HostCounter>
class QueryCacheBase {
public:
explicit QueryCacheBase(VideoCore::RasterizerInterface& rasterizer_,
Tegra::Engines::Maxwell3D& maxwell3d_,
Tegra::MemoryManager& gpu_memory_)
: rasterizer{rasterizer_}, maxwell3d{maxwell3d_},
gpu_memory{gpu_memory_}, streams{{CounterStream{static_cast<QueryCache&>(*this),
VideoCore::QueryType::SamplesPassed}}} {}
void InvalidateRegion(VAddr addr, std::size_t size) {
std::unique_lock lock{mutex};
FlushAndRemoveRegion(addr, size);
}
void FlushRegion(VAddr addr, std::size_t size) {
std::unique_lock lock{mutex};
FlushAndRemoveRegion(addr, size);
}
/**
* Records a query in GPU mapped memory, potentially marked with a timestamp.
* @param gpu_addr GPU address to flush to when the mapped memory is read.
* @param type Query type, e.g. SamplesPassed.
* @param timestamp Timestamp, when empty the flushed query is assumed to be short.
*/
void Query(GPUVAddr gpu_addr, VideoCore::QueryType type, std::optional<u64> timestamp) {
std::unique_lock lock{mutex};
const std::optional<VAddr> cpu_addr = gpu_memory.GpuToCpuAddress(gpu_addr);
ASSERT(cpu_addr);
CachedQuery* query = TryGet(*cpu_addr);
if (!query) {
ASSERT_OR_EXECUTE(cpu_addr, return;);
u8* const host_ptr = gpu_memory.GetPointer(gpu_addr);
query = Register(type, *cpu_addr, host_ptr, timestamp.has_value());
}
query->BindCounter(Stream(type).Current(), timestamp);
if (Settings::values.use_asynchronous_gpu_emulation.GetValue()) {
AsyncFlushQuery(*cpu_addr);
}
}
/// Updates counters from GPU state. Expected to be called once per draw, clear or dispatch.
void UpdateCounters() {
std::unique_lock lock{mutex};
const auto& regs = maxwell3d.regs;
Stream(VideoCore::QueryType::SamplesPassed).Update(regs.samplecnt_enable);
}
/// Resets a counter to zero. It doesn't disable the query after resetting.
void ResetCounter(VideoCore::QueryType type) {
std::unique_lock lock{mutex};
Stream(type).Reset();
}
/// Disable all active streams. Expected to be called at the end of a command buffer.
void DisableStreams() {
std::unique_lock lock{mutex};
for (auto& stream : streams) {
stream.Update(false);
}
}
/// Returns a new host counter.
std::shared_ptr<HostCounter> Counter(std::shared_ptr<HostCounter> dependency,
VideoCore::QueryType type) {
return std::make_shared<HostCounter>(static_cast<QueryCache&>(*this), std::move(dependency),
type);
}
/// Returns the counter stream of the specified type.
CounterStream& Stream(VideoCore::QueryType type) {
return streams[static_cast<std::size_t>(type)];
}
/// Returns the counter stream of the specified type.
const CounterStream& Stream(VideoCore::QueryType type) const {
return streams[static_cast<std::size_t>(type)];
}
void CommitAsyncFlushes() {
committed_flushes.push_back(uncommitted_flushes);
uncommitted_flushes.reset();
}
bool HasUncommittedFlushes() const {
return uncommitted_flushes != nullptr;
}
bool ShouldWaitAsyncFlushes() const {
if (committed_flushes.empty()) {
return false;
}
return committed_flushes.front() != nullptr;
}
void PopAsyncFlushes() {
if (committed_flushes.empty()) {
return;
}
auto& flush_list = committed_flushes.front();
if (!flush_list) {
committed_flushes.pop_front();
return;
}
for (VAddr query_address : *flush_list) {
FlushAndRemoveRegion(query_address, 4);
}
committed_flushes.pop_front();
}
private:
/// Flushes a memory range to guest memory and removes it from the cache.
void FlushAndRemoveRegion(VAddr addr, std::size_t size) {
const u64 addr_begin = addr;
const u64 addr_end = addr_begin + size;
const auto in_range = [addr_begin, addr_end](const CachedQuery& query) {
const u64 cache_begin = query.GetCpuAddr();
const u64 cache_end = cache_begin + query.SizeInBytes();
return cache_begin < addr_end && addr_begin < cache_end;
};
const u64 page_end = addr_end >> PAGE_BITS;
for (u64 page = addr_begin >> PAGE_BITS; page <= page_end; ++page) {
const auto& it = cached_queries.find(page);
if (it == std::end(cached_queries)) {
continue;
}
auto& contents = it->second;
for (auto& query : contents) {
if (!in_range(query)) {
continue;
}
rasterizer.UpdatePagesCachedCount(query.GetCpuAddr(), query.SizeInBytes(), -1);
query.Flush();
}
std::erase_if(contents, in_range);
}
}
/// Registers the passed parameters as cached and returns a pointer to the stored cached query.
CachedQuery* Register(VideoCore::QueryType type, VAddr cpu_addr, u8* host_ptr, bool timestamp) {
rasterizer.UpdatePagesCachedCount(cpu_addr, CachedQuery::SizeInBytes(timestamp), 1);
const u64 page = static_cast<u64>(cpu_addr) >> PAGE_BITS;
return &cached_queries[page].emplace_back(static_cast<QueryCache&>(*this), type, cpu_addr,
host_ptr);
}
/// Tries to a get a cached query. Returns nullptr on failure.
CachedQuery* TryGet(VAddr addr) {
const u64 page = static_cast<u64>(addr) >> PAGE_BITS;
const auto it = cached_queries.find(page);
if (it == std::end(cached_queries)) {
return nullptr;
}
auto& contents = it->second;
const auto found = std::find_if(std::begin(contents), std::end(contents),
[addr](auto& query) { return query.GetCpuAddr() == addr; });
return found != std::end(contents) ? &*found : nullptr;
}
void AsyncFlushQuery(VAddr addr) {
if (!uncommitted_flushes) {
uncommitted_flushes = std::make_shared<std::unordered_set<VAddr>>();
}
uncommitted_flushes->insert(addr);
}
static constexpr std::uintptr_t PAGE_SIZE = 4096;
static constexpr unsigned PAGE_BITS = 12;
VideoCore::RasterizerInterface& rasterizer;
Tegra::Engines::Maxwell3D& maxwell3d;
Tegra::MemoryManager& gpu_memory;
std::recursive_mutex mutex;
std::unordered_map<u64, std::vector<CachedQuery>> cached_queries;
std::array<CounterStream, VideoCore::NumQueryTypes> streams;
std::shared_ptr<std::unordered_set<VAddr>> uncommitted_flushes{};
std::list<std::shared_ptr<std::unordered_set<VAddr>>> committed_flushes;
};
template <class QueryCache, class HostCounter>
class HostCounterBase {
public:
explicit HostCounterBase(std::shared_ptr<HostCounter> dependency_)
: dependency{std::move(dependency_)}, depth{dependency ? (dependency->Depth() + 1) : 0} {
// Avoid nesting too many dependencies to avoid a stack overflow when these are deleted.
constexpr u64 depth_threshold = 96;
if (depth > depth_threshold) {
depth = 0;
base_result = dependency->Query();
dependency = nullptr;
}
}
virtual ~HostCounterBase() = default;
/// Returns the current value of the query.
u64 Query() {
if (result) {
return *result;
}
u64 value = BlockingQuery() + base_result;
if (dependency) {
value += dependency->Query();
dependency = nullptr;
}
result = value;
return *result;
}
/// Returns true when flushing this query will potentially wait.
bool WaitPending() const noexcept {
return result.has_value();
}
u64 Depth() const noexcept {
return depth;
}
protected:
/// Returns the value of query from the backend API blocking as needed.
virtual u64 BlockingQuery() const = 0;
private:
std::shared_ptr<HostCounter> dependency; ///< Counter to add to this value.
std::optional<u64> result; ///< Filled with the already returned value.
u64 depth; ///< Number of nested dependencies.
u64 base_result = 0; ///< Equivalent to nested dependencies value.
};
template <class HostCounter>
class CachedQueryBase {
public:
explicit CachedQueryBase(VAddr cpu_addr_, u8* host_ptr_)
: cpu_addr{cpu_addr_}, host_ptr{host_ptr_} {}
virtual ~CachedQueryBase() = default;
CachedQueryBase(CachedQueryBase&&) noexcept = default;
CachedQueryBase(const CachedQueryBase&) = delete;
CachedQueryBase& operator=(CachedQueryBase&&) noexcept = default;
CachedQueryBase& operator=(const CachedQueryBase&) = delete;
/// Flushes the query to guest memory.
virtual void Flush() {
// When counter is nullptr it means that it's just been reseted. We are supposed to write a
// zero in these cases.
const u64 value = counter ? counter->Query() : 0;
std::memcpy(host_ptr, &value, sizeof(u64));
if (timestamp) {
std::memcpy(host_ptr + TIMESTAMP_OFFSET, &*timestamp, sizeof(u64));
}
}
/// Binds a counter to this query.
void BindCounter(std::shared_ptr<HostCounter> counter_, std::optional<u64> timestamp_) {
if (counter) {
// If there's an old counter set it means the query is being rewritten by the game.
// To avoid losing the data forever, flush here.
Flush();
}
counter = std::move(counter_);
timestamp = timestamp_;
}
VAddr GetCpuAddr() const noexcept {
return cpu_addr;
}
u64 SizeInBytes() const noexcept {
return SizeInBytes(timestamp.has_value());
}
static constexpr u64 SizeInBytes(bool with_timestamp) noexcept {
return with_timestamp ? LARGE_QUERY_SIZE : SMALL_QUERY_SIZE;
}
protected:
/// Returns true when querying the counter may potentially block.
bool WaitPending() const noexcept {
return counter && counter->WaitPending();
}
private:
static constexpr std::size_t SMALL_QUERY_SIZE = 8; // Query size without timestamp.
static constexpr std::size_t LARGE_QUERY_SIZE = 16; // Query size with timestamp.
static constexpr std::intptr_t TIMESTAMP_OFFSET = 8; // Timestamp offset in a large query.
VAddr cpu_addr; ///< Guest CPU address.
u8* host_ptr; ///< Writable host pointer.
std::shared_ptr<HostCounter> counter; ///< Host counter to query, owns the dependency tree.
std::optional<u64> timestamp; ///< Timestamp to flush to guest memory.
};
} // namespace VideoCommon
