forked from suyu/suyu
(wall, native)_clock: Rework NativeClock
This commit is contained in:
Morph
parent
dd12dd4c67
commit
1492a65454
5 changed files with 94 additions and 259 deletions
|
|
@ -28,13 +28,12 @@ static s64 GetSystemTimeNS() {
|
|||
// GetSystemTimePreciseAsFileTime returns the file time in 100ns units.
|
||||
static constexpr s64 Multiplier = 100;
|
||||
// Convert Windows epoch to Unix epoch.
|
||||
static constexpr s64 WindowsEpochToUnixEpochNS = 0x19DB1DED53E8000LL;
|
||||
static constexpr s64 WindowsEpochToUnixEpoch = 0x19DB1DED53E8000LL;
|
||||
|
||||
FILETIME filetime;
|
||||
GetSystemTimePreciseAsFileTime(&filetime);
|
||||
return Multiplier * ((static_cast<s64>(filetime.dwHighDateTime) << 32) +
|
||||
static_cast<s64>(filetime.dwLowDateTime)) -
|
||||
WindowsEpochToUnixEpochNS;
|
||||
static_cast<s64>(filetime.dwLowDateTime) - WindowsEpochToUnixEpoch);
|
||||
}
|
||||
#endif
|
||||
|
||||
|
|
|
|||
|
|
@ -2,88 +2,71 @@
|
|||
// SPDX-License-Identifier: GPL-2.0-or-later
|
||||
|
||||
#include "common/steady_clock.h"
|
||||
#include "common/uint128.h"
|
||||
#include "common/wall_clock.h"
|
||||
|
||||
#ifdef ARCHITECTURE_x86_64
|
||||
#include "common/x64/cpu_detect.h"
|
||||
#include "common/x64/native_clock.h"
|
||||
#include "common/x64/rdtsc.h"
|
||||
#endif
|
||||
|
||||
namespace Common {
|
||||
|
||||
class StandardWallClock final : public WallClock {
|
||||
public:
|
||||
explicit StandardWallClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_)
|
||||
: WallClock{emulated_cpu_frequency_, emulated_clock_frequency_, false},
|
||||
start_time{SteadyClock::Now()} {}
|
||||
explicit StandardWallClock() : start_time{SteadyClock::Now()} {}
|
||||
|
||||
std::chrono::nanoseconds GetTimeNS() override {
|
||||
std::chrono::nanoseconds GetTimeNS() const override {
|
||||
return SteadyClock::Now() - start_time;
|
||||
}
|
||||
|
||||
std::chrono::microseconds GetTimeUS() override {
|
||||
return std::chrono::duration_cast<std::chrono::microseconds>(GetTimeNS());
|
||||
std::chrono::microseconds GetTimeUS() const override {
|
||||
return static_cast<std::chrono::microseconds>(GetHostTicksElapsed() / NsToUsRatio::den);
|
||||
}
|
||||
|
||||
std::chrono::milliseconds GetTimeMS() override {
|
||||
return std::chrono::duration_cast<std::chrono::milliseconds>(GetTimeNS());
|
||||
std::chrono::milliseconds GetTimeMS() const override {
|
||||
return static_cast<std::chrono::milliseconds>(GetHostTicksElapsed() / NsToMsRatio::den);
|
||||
}
|
||||
|
||||
u64 GetClockCycles() override {
|
||||
const u128 temp = Common::Multiply64Into128(GetTimeNS().count(), emulated_clock_frequency);
|
||||
return Common::Divide128On32(temp, NS_RATIO).first;
|
||||
u64 GetCNTPCT() const override {
|
||||
return GetHostTicksElapsed() * NsToCNTPCTRatio::num / NsToCNTPCTRatio::den;
|
||||
}
|
||||
|
||||
u64 GetCPUCycles() override {
|
||||
const u128 temp = Common::Multiply64Into128(GetTimeNS().count(), emulated_cpu_frequency);
|
||||
return Common::Divide128On32(temp, NS_RATIO).first;
|
||||
u64 GetHostTicksNow() const override {
|
||||
return static_cast<u64>(SteadyClock::Now().time_since_epoch().count());
|
||||
}
|
||||
|
||||
void Pause([[maybe_unused]] bool is_paused) override {
|
||||
// Do nothing in this clock type.
|
||||
u64 GetHostTicksElapsed() const override {
|
||||
return static_cast<u64>(GetTimeNS().count());
|
||||
}
|
||||
|
||||
bool IsNative() const override {
|
||||
return false;
|
||||
}
|
||||
|
||||
private:
|
||||
SteadyClock::time_point start_time;
|
||||
};
|
||||
|
||||
std::unique_ptr<WallClock> CreateOptimalClock() {
|
||||
#ifdef ARCHITECTURE_x86_64
|
||||
|
||||
std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency,
|
||||
u64 emulated_clock_frequency) {
|
||||
const auto& caps = GetCPUCaps();
|
||||
u64 rtsc_frequency = 0;
|
||||
if (caps.invariant_tsc) {
|
||||
rtsc_frequency = caps.tsc_frequency ? caps.tsc_frequency : EstimateRDTSCFrequency();
|
||||
}
|
||||
|
||||
// Fallback to StandardWallClock if the hardware TSC does not have the precision greater than:
|
||||
// - A nanosecond
|
||||
// - The emulated CPU frequency
|
||||
// - The emulated clock counter frequency (CNTFRQ)
|
||||
if (rtsc_frequency <= WallClock::NS_RATIO || rtsc_frequency <= emulated_cpu_frequency ||
|
||||
rtsc_frequency <= emulated_clock_frequency) {
|
||||
return std::make_unique<StandardWallClock>(emulated_cpu_frequency,
|
||||
emulated_clock_frequency);
|
||||
if (caps.invariant_tsc && caps.tsc_frequency >= WallClock::CNTFRQ) {
|
||||
return std::make_unique<X64::NativeClock>(caps.tsc_frequency);
|
||||
} else {
|
||||
return std::make_unique<X64::NativeClock>(emulated_cpu_frequency, emulated_clock_frequency,
|
||||
rtsc_frequency);
|
||||
// Fallback to StandardWallClock if the hardware TSC
|
||||
// - Is not invariant
|
||||
// - Is not more precise than CNTFRQ
|
||||
return std::make_unique<StandardWallClock>();
|
||||
}
|
||||
}
|
||||
|
||||
#else
|
||||
|
||||
std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency,
|
||||
u64 emulated_clock_frequency) {
|
||||
return std::make_unique<StandardWallClock>(emulated_cpu_frequency, emulated_clock_frequency);
|
||||
return std::make_unique<StandardWallClock>();
|
||||
#endif
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
std::unique_ptr<WallClock> CreateStandardWallClock(u64 emulated_cpu_frequency,
|
||||
u64 emulated_clock_frequency) {
|
||||
return std::make_unique<StandardWallClock>(emulated_cpu_frequency, emulated_clock_frequency);
|
||||
std::unique_ptr<WallClock> CreateStandardWallClock() {
|
||||
return std::make_unique<StandardWallClock>();
|
||||
}
|
||||
|
||||
} // namespace Common
|
||||
|
|
|
|||
|
|
@ -5,6 +5,7 @@
|
|||
|
||||
#include <chrono>
|
||||
#include <memory>
|
||||
#include <ratio>
|
||||
|
||||
#include "common/common_types.h"
|
||||
|
||||
|
|
@ -12,50 +13,43 @@ namespace Common {
|
|||
|
||||
class WallClock {
|
||||
public:
|
||||
static constexpr u64 NS_RATIO = 1'000'000'000;
|
||||
static constexpr u64 US_RATIO = 1'000'000;
|
||||
static constexpr u64 MS_RATIO = 1'000;
|
||||
static constexpr u64 CNTFRQ = 19'200'000; // CNTPCT_EL0 Frequency = 19.2 MHz
|
||||
|
||||
virtual ~WallClock() = default;
|
||||
|
||||
/// Returns current wall time in nanoseconds
|
||||
[[nodiscard]] virtual std::chrono::nanoseconds GetTimeNS() = 0;
|
||||
/// @returns The time in nanoseconds since the construction of this clock.
|
||||
virtual std::chrono::nanoseconds GetTimeNS() const = 0;
|
||||
|
||||
/// Returns current wall time in microseconds
|
||||
[[nodiscard]] virtual std::chrono::microseconds GetTimeUS() = 0;
|
||||
/// @returns The time in microseconds since the construction of this clock.
|
||||
virtual std::chrono::microseconds GetTimeUS() const = 0;
|
||||
|
||||
/// Returns current wall time in milliseconds
|
||||
[[nodiscard]] virtual std::chrono::milliseconds GetTimeMS() = 0;
|
||||
/// @returns The time in milliseconds since the construction of this clock.
|
||||
virtual std::chrono::milliseconds GetTimeMS() const = 0;
|
||||
|
||||
/// Returns current wall time in emulated clock cycles
|
||||
[[nodiscard]] virtual u64 GetClockCycles() = 0;
|
||||
/// @returns The guest CNTPCT ticks since the construction of this clock.
|
||||
virtual u64 GetCNTPCT() const = 0;
|
||||
|
||||
/// Returns current wall time in emulated cpu cycles
|
||||
[[nodiscard]] virtual u64 GetCPUCycles() = 0;
|
||||
/// @returns The raw host timer ticks since an indeterminate epoch.
|
||||
virtual u64 GetHostTicksNow() const = 0;
|
||||
|
||||
virtual void Pause(bool is_paused) = 0;
|
||||
/// @returns The raw host timer ticks since the construction of this clock.
|
||||
virtual u64 GetHostTicksElapsed() const = 0;
|
||||
|
||||
/// Tells if the wall clock, uses the host CPU's hardware clock
|
||||
[[nodiscard]] bool IsNative() const {
|
||||
return is_native;
|
||||
}
|
||||
/// @returns Whether the clock directly uses the host's hardware clock.
|
||||
virtual bool IsNative() const = 0;
|
||||
|
||||
protected:
|
||||
explicit WallClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_, bool is_native_)
|
||||
: emulated_cpu_frequency{emulated_cpu_frequency_},
|
||||
emulated_clock_frequency{emulated_clock_frequency_}, is_native{is_native_} {}
|
||||
using NsRatio = std::nano;
|
||||
using UsRatio = std::micro;
|
||||
using MsRatio = std::milli;
|
||||
|
||||
u64 emulated_cpu_frequency;
|
||||
u64 emulated_clock_frequency;
|
||||
|
||||
private:
|
||||
bool is_native;
|
||||
using NsToUsRatio = std::ratio_divide<std::nano, std::micro>;
|
||||
using NsToMsRatio = std::ratio_divide<std::nano, std::milli>;
|
||||
using NsToCNTPCTRatio = std::ratio<CNTFRQ, std::nano::den>;
|
||||
};
|
||||
|
||||
[[nodiscard]] std::unique_ptr<WallClock> CreateBestMatchingClock(u64 emulated_cpu_frequency,
|
||||
u64 emulated_clock_frequency);
|
||||
std::unique_ptr<WallClock> CreateOptimalClock();
|
||||
|
||||
[[nodiscard]] std::unique_ptr<WallClock> CreateStandardWallClock(u64 emulated_cpu_frequency,
|
||||
u64 emulated_clock_frequency);
|
||||
std::unique_ptr<WallClock> CreateStandardWallClock();
|
||||
|
||||
} // namespace Common
|
||||
|
|
|
|||
|
|
@ -1,164 +1,45 @@
|
|||
// SPDX-FileCopyrightText: Copyright 2020 yuzu Emulator Project
|
||||
// SPDX-License-Identifier: GPL-2.0-or-later
|
||||
|
||||
#include <array>
|
||||
#include <chrono>
|
||||
#include <thread>
|
||||
|
||||
#include "common/atomic_ops.h"
|
||||
#include "common/steady_clock.h"
|
||||
#include "common/uint128.h"
|
||||
#include "common/x64/native_clock.h"
|
||||
#include "common/x64/rdtsc.h"
|
||||
|
||||
#ifdef _MSC_VER
|
||||
#include <intrin.h>
|
||||
#endif
|
||||
namespace Common::X64 {
|
||||
|
||||
namespace Common {
|
||||
NativeClock::NativeClock(u64 rdtsc_frequency_)
|
||||
: start_ticks{FencedRDTSC()}, rdtsc_frequency{rdtsc_frequency_},
|
||||
ns_rdtsc_factor{GetFixedPoint64Factor(NsRatio::den, rdtsc_frequency)},
|
||||
us_rdtsc_factor{GetFixedPoint64Factor(UsRatio::den, rdtsc_frequency)},
|
||||
ms_rdtsc_factor{GetFixedPoint64Factor(MsRatio::den, rdtsc_frequency)},
|
||||
cntpct_rdtsc_factor{GetFixedPoint64Factor(CNTFRQ, rdtsc_frequency)} {}
|
||||
|
||||
#ifdef _MSC_VER
|
||||
__forceinline static u64 FencedRDTSC() {
|
||||
_mm_lfence();
|
||||
_ReadWriteBarrier();
|
||||
const u64 result = __rdtsc();
|
||||
_mm_lfence();
|
||||
_ReadWriteBarrier();
|
||||
return result;
|
||||
}
|
||||
#else
|
||||
static u64 FencedRDTSC() {
|
||||
u64 eax;
|
||||
u64 edx;
|
||||
asm volatile("lfence\n\t"
|
||||
"rdtsc\n\t"
|
||||
"lfence\n\t"
|
||||
: "=a"(eax), "=d"(edx));
|
||||
return (edx << 32) | eax;
|
||||
}
|
||||
#endif
|
||||
|
||||
template <u64 Nearest>
|
||||
static u64 RoundToNearest(u64 value) {
|
||||
const auto mod = value % Nearest;
|
||||
return mod >= (Nearest / 2) ? (value - mod + Nearest) : (value - mod);
|
||||
std::chrono::nanoseconds NativeClock::GetTimeNS() const {
|
||||
return std::chrono::nanoseconds{MultiplyHigh(GetHostTicksElapsed(), ns_rdtsc_factor)};
|
||||
}
|
||||
|
||||
u64 EstimateRDTSCFrequency() {
|
||||
// Discard the first result measuring the rdtsc.
|
||||
FencedRDTSC();
|
||||
std::this_thread::sleep_for(std::chrono::milliseconds{1});
|
||||
FencedRDTSC();
|
||||
|
||||
// Get the current time.
|
||||
const auto start_time = Common::RealTimeClock::Now();
|
||||
const u64 tsc_start = FencedRDTSC();
|
||||
// Wait for 250 milliseconds.
|
||||
std::this_thread::sleep_for(std::chrono::milliseconds{250});
|
||||
const auto end_time = Common::RealTimeClock::Now();
|
||||
const u64 tsc_end = FencedRDTSC();
|
||||
// Calculate differences.
|
||||
const u64 timer_diff = static_cast<u64>(
|
||||
std::chrono::duration_cast<std::chrono::nanoseconds>(end_time - start_time).count());
|
||||
const u64 tsc_diff = tsc_end - tsc_start;
|
||||
const u64 tsc_freq = MultiplyAndDivide64(tsc_diff, 1000000000ULL, timer_diff);
|
||||
return RoundToNearest<1000>(tsc_freq);
|
||||
std::chrono::microseconds NativeClock::GetTimeUS() const {
|
||||
return std::chrono::microseconds{MultiplyHigh(GetHostTicksElapsed(), us_rdtsc_factor)};
|
||||
}
|
||||
|
||||
namespace X64 {
|
||||
NativeClock::NativeClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_,
|
||||
u64 rtsc_frequency_)
|
||||
: WallClock(emulated_cpu_frequency_, emulated_clock_frequency_, true), rtsc_frequency{
|
||||
rtsc_frequency_} {
|
||||
// Thread to re-adjust the RDTSC frequency after 10 seconds has elapsed.
|
||||
time_sync_thread = std::jthread{[this](std::stop_token token) {
|
||||
// Get the current time.
|
||||
const auto start_time = Common::RealTimeClock::Now();
|
||||
const u64 tsc_start = FencedRDTSC();
|
||||
// Wait for 10 seconds.
|
||||
if (!Common::StoppableTimedWait(token, std::chrono::seconds{10})) {
|
||||
return;
|
||||
}
|
||||
const auto end_time = Common::RealTimeClock::Now();
|
||||
const u64 tsc_end = FencedRDTSC();
|
||||
// Calculate differences.
|
||||
const u64 timer_diff = static_cast<u64>(
|
||||
std::chrono::duration_cast<std::chrono::nanoseconds>(end_time - start_time).count());
|
||||
const u64 tsc_diff = tsc_end - tsc_start;
|
||||
const u64 tsc_freq = MultiplyAndDivide64(tsc_diff, 1000000000ULL, timer_diff);
|
||||
rtsc_frequency = tsc_freq;
|
||||
CalculateAndSetFactors();
|
||||
}};
|
||||
|
||||
time_point.inner.last_measure = FencedRDTSC();
|
||||
time_point.inner.accumulated_ticks = 0U;
|
||||
CalculateAndSetFactors();
|
||||
std::chrono::milliseconds NativeClock::GetTimeMS() const {
|
||||
return std::chrono::milliseconds{MultiplyHigh(GetHostTicksElapsed(), ms_rdtsc_factor)};
|
||||
}
|
||||
|
||||
u64 NativeClock::GetRTSC() {
|
||||
TimePoint new_time_point{};
|
||||
TimePoint current_time_point{};
|
||||
|
||||
current_time_point.pack = Common::AtomicLoad128(time_point.pack.data());
|
||||
do {
|
||||
const u64 current_measure = FencedRDTSC();
|
||||
u64 diff = current_measure - current_time_point.inner.last_measure;
|
||||
diff = diff & ~static_cast<u64>(static_cast<s64>(diff) >> 63); // max(diff, 0)
|
||||
new_time_point.inner.last_measure = current_measure > current_time_point.inner.last_measure
|
||||
? current_measure
|
||||
: current_time_point.inner.last_measure;
|
||||
new_time_point.inner.accumulated_ticks = current_time_point.inner.accumulated_ticks + diff;
|
||||
} while (!Common::AtomicCompareAndSwap(time_point.pack.data(), new_time_point.pack,
|
||||
current_time_point.pack, current_time_point.pack));
|
||||
return new_time_point.inner.accumulated_ticks;
|
||||
u64 NativeClock::GetCNTPCT() const {
|
||||
return MultiplyHigh(GetHostTicksElapsed(), cntpct_rdtsc_factor);
|
||||
}
|
||||
|
||||
void NativeClock::Pause(bool is_paused) {
|
||||
if (!is_paused) {
|
||||
TimePoint current_time_point{};
|
||||
TimePoint new_time_point{};
|
||||
|
||||
current_time_point.pack = Common::AtomicLoad128(time_point.pack.data());
|
||||
do {
|
||||
new_time_point.pack = current_time_point.pack;
|
||||
new_time_point.inner.last_measure = FencedRDTSC();
|
||||
} while (!Common::AtomicCompareAndSwap(time_point.pack.data(), new_time_point.pack,
|
||||
current_time_point.pack, current_time_point.pack));
|
||||
}
|
||||
u64 NativeClock::GetHostTicksNow() const {
|
||||
return FencedRDTSC();
|
||||
}
|
||||
|
||||
std::chrono::nanoseconds NativeClock::GetTimeNS() {
|
||||
const u64 rtsc_value = GetRTSC();
|
||||
return std::chrono::nanoseconds{MultiplyHigh(rtsc_value, ns_rtsc_factor)};
|
||||
u64 NativeClock::GetHostTicksElapsed() const {
|
||||
return FencedRDTSC() - start_ticks;
|
||||
}
|
||||
|
||||
std::chrono::microseconds NativeClock::GetTimeUS() {
|
||||
const u64 rtsc_value = GetRTSC();
|
||||
return std::chrono::microseconds{MultiplyHigh(rtsc_value, us_rtsc_factor)};
|
||||
bool NativeClock::IsNative() const {
|
||||
return true;
|
||||
}
|
||||
|
||||
std::chrono::milliseconds NativeClock::GetTimeMS() {
|
||||
const u64 rtsc_value = GetRTSC();
|
||||
return std::chrono::milliseconds{MultiplyHigh(rtsc_value, ms_rtsc_factor)};
|
||||
}
|
||||
|
||||
u64 NativeClock::GetClockCycles() {
|
||||
const u64 rtsc_value = GetRTSC();
|
||||
return MultiplyHigh(rtsc_value, clock_rtsc_factor);
|
||||
}
|
||||
|
||||
u64 NativeClock::GetCPUCycles() {
|
||||
const u64 rtsc_value = GetRTSC();
|
||||
return MultiplyHigh(rtsc_value, cpu_rtsc_factor);
|
||||
}
|
||||
|
||||
void NativeClock::CalculateAndSetFactors() {
|
||||
ns_rtsc_factor = GetFixedPoint64Factor(NS_RATIO, rtsc_frequency);
|
||||
us_rtsc_factor = GetFixedPoint64Factor(US_RATIO, rtsc_frequency);
|
||||
ms_rtsc_factor = GetFixedPoint64Factor(MS_RATIO, rtsc_frequency);
|
||||
clock_rtsc_factor = GetFixedPoint64Factor(emulated_clock_frequency, rtsc_frequency);
|
||||
cpu_rtsc_factor = GetFixedPoint64Factor(emulated_cpu_frequency, rtsc_frequency);
|
||||
}
|
||||
|
||||
} // namespace X64
|
||||
|
||||
} // namespace Common
|
||||
} // namespace Common::X64
|
||||
|
|
|
|||
|
|
@ -3,58 +3,36 @@
|
|||
|
||||
#pragma once
|
||||
|
||||
#include "common/polyfill_thread.h"
|
||||
#include "common/wall_clock.h"
|
||||
|
||||
namespace Common {
|
||||
namespace Common::X64 {
|
||||
|
||||
namespace X64 {
|
||||
class NativeClock final : public WallClock {
|
||||
public:
|
||||
explicit NativeClock(u64 emulated_cpu_frequency_, u64 emulated_clock_frequency_,
|
||||
u64 rtsc_frequency_);
|
||||
explicit NativeClock(u64 rdtsc_frequency_);
|
||||
|
||||
std::chrono::nanoseconds GetTimeNS() override;
|
||||
std::chrono::nanoseconds GetTimeNS() const override;
|
||||
|
||||
std::chrono::microseconds GetTimeUS() override;
|
||||
std::chrono::microseconds GetTimeUS() const override;
|
||||
|
||||
std::chrono::milliseconds GetTimeMS() override;
|
||||
std::chrono::milliseconds GetTimeMS() const override;
|
||||
|
||||
u64 GetClockCycles() override;
|
||||
u64 GetCNTPCT() const override;
|
||||
|
||||
u64 GetCPUCycles() override;
|
||||
u64 GetHostTicksNow() const override;
|
||||
|
||||
void Pause(bool is_paused) override;
|
||||
u64 GetHostTicksElapsed() const override;
|
||||
|
||||
bool IsNative() const override;
|
||||
|
||||
private:
|
||||
u64 GetRTSC();
|
||||
u64 start_ticks;
|
||||
u64 rdtsc_frequency;
|
||||
|
||||
void CalculateAndSetFactors();
|
||||
|
||||
union alignas(16) TimePoint {
|
||||
TimePoint() : pack{} {}
|
||||
u128 pack{};
|
||||
struct Inner {
|
||||
u64 last_measure{};
|
||||
u64 accumulated_ticks{};
|
||||
} inner;
|
||||
};
|
||||
|
||||
TimePoint time_point;
|
||||
|
||||
// factors
|
||||
u64 clock_rtsc_factor{};
|
||||
u64 cpu_rtsc_factor{};
|
||||
u64 ns_rtsc_factor{};
|
||||
u64 us_rtsc_factor{};
|
||||
u64 ms_rtsc_factor{};
|
||||
|
||||
u64 rtsc_frequency;
|
||||
|
||||
std::jthread time_sync_thread;
|
||||
u64 ns_rdtsc_factor;
|
||||
u64 us_rdtsc_factor;
|
||||
u64 ms_rdtsc_factor;
|
||||
u64 cntpct_rdtsc_factor;
|
||||
};
|
||||
} // namespace X64
|
||||
|
||||
u64 EstimateRDTSCFrequency();
|
||||
|
||||
} // namespace Common
|
||||
} // namespace Common::X64
|
||||
|
|
|
|||
Loading…
Reference in a new issue