From 8e56a84566036cfff0aa5c3d80ae1b051d2bd0bf Mon Sep 17 00:00:00 2001 From: Morph <39850852+Morph1984@users.noreply.github.com> Date: Sun, 23 Apr 2023 00:01:08 -0400 Subject: core_timing: Use CNTPCT as the guest CPU tick Previously, we were mixing the raw CPU frequency and CNTFRQ. The raw CPU frequency (1020 MHz) should've never been used as CNTPCT (whose frequency is CNTFRQ) is the only counter available. --- src/video_core/gpu.cpp | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) (limited to 'src/video_core') diff --git a/src/video_core/gpu.cpp b/src/video_core/gpu.cpp index 456f733cf..70762c51a 100644 --- a/src/video_core/gpu.cpp +++ b/src/video_core/gpu.cpp @@ -194,17 +194,17 @@ struct GPU::Impl { [[nodiscard]] u64 GetTicks() const { // This values were reversed engineered by fincs from NVN - // The gpu clock is reported in units of 385/625 nanoseconds - constexpr u64 gpu_ticks_num = 384; - constexpr u64 gpu_ticks_den = 625; + // The GPU clock is 614.4 MHz + using NsToGPUTickRatio = std::ratio<614'400'000, std::nano::den>; + static_assert(NsToGPUTickRatio::num == 384 && NsToGPUTickRatio::den == 625); + + u64 nanoseconds = system.CoreTiming().GetGlobalTimeNs().count(); - u64 nanoseconds = system.CoreTiming().GetCPUTimeNs().count(); if (Settings::values.use_fast_gpu_time.GetValue()) { nanoseconds /= 256; } - const u64 nanoseconds_num = nanoseconds / gpu_ticks_den; - const u64 nanoseconds_rem = nanoseconds % gpu_ticks_den; - return nanoseconds_num * gpu_ticks_num + (nanoseconds_rem * gpu_ticks_num) / gpu_ticks_den; + + return nanoseconds * NsToGPUTickRatio::num / NsToGPUTickRatio::den; } [[nodiscard]] bool IsAsync() const { -- cgit v1.2.3 From 907507886d755fa56099713c4b8f05bb640a8b7d Mon Sep 17 00:00:00 2001 From: Morph <39850852+Morph1984@users.noreply.github.com> Date: Sun, 28 May 2023 17:45:47 -0400 Subject: (wall, native)_clock: Add GetGPUTick Allows us to directly calculate the GPU tick without double conversion to and from the host clock tick. --- src/common/wall_clock.cpp | 8 ++++++-- src/common/wall_clock.h | 20 +++++++++++++++++++- src/common/x64/native_clock.cpp | 7 ++++++- src/common/x64/native_clock.h | 3 +++ src/core/core_timing.cpp | 7 +++++++ src/core/core_timing.h | 3 +++ src/video_core/gpu.cpp | 11 +++-------- 7 files changed, 47 insertions(+), 12 deletions(-) (limited to 'src/video_core') diff --git a/src/common/wall_clock.cpp b/src/common/wall_clock.cpp index ad8db06b0..dc0dcbd68 100644 --- a/src/common/wall_clock.cpp +++ b/src/common/wall_clock.cpp @@ -32,6 +32,10 @@ public: return GetHostTicksElapsed() * NsToCNTPCTRatio::num / NsToCNTPCTRatio::den; } + u64 GetGPUTick() const override { + return GetHostTicksElapsed() * NsToGPUTickRatio::num / NsToGPUTickRatio::den; + } + u64 GetHostTicksNow() const override { return static_cast(SteadyClock::Now().time_since_epoch().count()); } @@ -52,12 +56,12 @@ std::unique_ptr CreateOptimalClock() { #ifdef ARCHITECTURE_x86_64 const auto& caps = GetCPUCaps(); - if (caps.invariant_tsc && caps.tsc_frequency >= WallClock::CNTFRQ) { + if (caps.invariant_tsc && caps.tsc_frequency >= WallClock::GPUTickFreq) { return std::make_unique(caps.tsc_frequency); } else { // Fallback to StandardWallClock if the hardware TSC // - Is not invariant - // - Is not more precise than CNTFRQ + // - Is not more precise than GPUTickFreq return std::make_unique(); } #else diff --git a/src/common/wall_clock.h b/src/common/wall_clock.h index 56c18ca25..fcfdd637c 100644 --- a/src/common/wall_clock.h +++ b/src/common/wall_clock.h @@ -13,7 +13,8 @@ namespace Common { class WallClock { public: - static constexpr u64 CNTFRQ = 19'200'000; // CNTPCT_EL0 Frequency = 19.2 MHz + static constexpr u64 CNTFRQ = 19'200'000; // CNTPCT_EL0 Frequency = 19.2 MHz + static constexpr u64 GPUTickFreq = 614'400'000; // GM20B GPU Tick Frequency = 614.4 MHz virtual ~WallClock() = default; @@ -29,6 +30,9 @@ public: /// @returns The guest CNTPCT ticks since the construction of this clock. virtual u64 GetCNTPCT() const = 0; + /// @returns The guest GPU ticks since the construction of this clock. + virtual u64 GetGPUTick() const = 0; + /// @returns The raw host timer ticks since an indeterminate epoch. virtual u64 GetHostTicksNow() const = 0; @@ -46,6 +50,10 @@ public: return us * UsToCNTPCTRatio::num / UsToCNTPCTRatio::den; } + static inline u64 NSToGPUTick(u64 ns) { + return ns * NsToGPUTickRatio::num / NsToGPUTickRatio::den; + } + static inline u64 CNTPCTToNS(u64 cntpct) { return cntpct * NsToCNTPCTRatio::den / NsToCNTPCTRatio::num; } @@ -54,6 +62,14 @@ public: return cntpct * UsToCNTPCTRatio::den / UsToCNTPCTRatio::num; } + static inline u64 GPUTickToNS(u64 gpu_tick) { + return gpu_tick * NsToGPUTickRatio::den / NsToGPUTickRatio::num; + } + + static inline u64 CNTPCTToGPUTick(u64 cntpct) { + return cntpct * CNTPCTToGPUTickRatio::num / CNTPCTToGPUTickRatio::den; + } + protected: using NsRatio = std::nano; using UsRatio = std::micro; @@ -63,6 +79,8 @@ protected: using NsToMsRatio = std::ratio_divide; using NsToCNTPCTRatio = std::ratio; using UsToCNTPCTRatio = std::ratio; + using NsToGPUTickRatio = std::ratio; + using CNTPCTToGPUTickRatio = std::ratio; }; std::unique_ptr CreateOptimalClock(); diff --git a/src/common/x64/native_clock.cpp b/src/common/x64/native_clock.cpp index 5d1eb0590..7d2a26bd9 100644 --- a/src/common/x64/native_clock.cpp +++ b/src/common/x64/native_clock.cpp @@ -12,7 +12,8 @@ NativeClock::NativeClock(u64 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)} {} + cntpct_rdtsc_factor{GetFixedPoint64Factor(CNTFRQ, rdtsc_frequency)}, + gputick_rdtsc_factor{GetFixedPoint64Factor(GPUTickFreq, rdtsc_frequency)} {} std::chrono::nanoseconds NativeClock::GetTimeNS() const { return std::chrono::nanoseconds{MultiplyHigh(GetHostTicksElapsed(), ns_rdtsc_factor)}; @@ -30,6 +31,10 @@ u64 NativeClock::GetCNTPCT() const { return MultiplyHigh(GetHostTicksElapsed(), cntpct_rdtsc_factor); } +u64 NativeClock::GetGPUTick() const { + return MultiplyHigh(GetHostTicksElapsed(), gputick_rdtsc_factor); +} + u64 NativeClock::GetHostTicksNow() const { return FencedRDTSC(); } diff --git a/src/common/x64/native_clock.h b/src/common/x64/native_clock.h index d6f8626c1..334415eff 100644 --- a/src/common/x64/native_clock.h +++ b/src/common/x64/native_clock.h @@ -19,6 +19,8 @@ public: u64 GetCNTPCT() const override; + u64 GetGPUTick() const override; + u64 GetHostTicksNow() const override; u64 GetHostTicksElapsed() const override; @@ -33,6 +35,7 @@ private: u64 us_rdtsc_factor; u64 ms_rdtsc_factor; u64 cntpct_rdtsc_factor; + u64 gputick_rdtsc_factor; }; } // namespace Common::X64 diff --git a/src/core/core_timing.cpp b/src/core/core_timing.cpp index 9a1d5a69a..e57bca70a 100644 --- a/src/core/core_timing.cpp +++ b/src/core/core_timing.cpp @@ -197,6 +197,13 @@ u64 CoreTiming::GetClockTicks() const { return ticks; } +u64 CoreTiming::GetGPUTicks() const { + if (is_multicore) [[likely]] { + return clock->GetGPUTick(); + } + return Common::WallClock::CNTPCTToGPUTick(ticks); +} + std::optional CoreTiming::Advance() { std::scoped_lock lock{advance_lock, basic_lock}; global_timer = GetGlobalTimeNs().count(); diff --git a/src/core/core_timing.h b/src/core/core_timing.h index fdacdd94a..1873852c4 100644 --- a/src/core/core_timing.h +++ b/src/core/core_timing.h @@ -119,6 +119,9 @@ public: /// Returns the current CNTPCT tick value. u64 GetClockTicks() const; + /// Returns the current GPU tick value. + u64 GetGPUTicks() const; + /// Returns current time in microseconds. std::chrono::microseconds GetGlobalTimeUs() const; diff --git a/src/video_core/gpu.cpp b/src/video_core/gpu.cpp index 70762c51a..db385076d 100644 --- a/src/video_core/gpu.cpp +++ b/src/video_core/gpu.cpp @@ -193,18 +193,13 @@ struct GPU::Impl { } [[nodiscard]] u64 GetTicks() const { - // This values were reversed engineered by fincs from NVN - // The GPU clock is 614.4 MHz - using NsToGPUTickRatio = std::ratio<614'400'000, std::nano::den>; - static_assert(NsToGPUTickRatio::num == 384 && NsToGPUTickRatio::den == 625); - - u64 nanoseconds = system.CoreTiming().GetGlobalTimeNs().count(); + u64 gpu_tick = system.CoreTiming().GetGPUTicks(); if (Settings::values.use_fast_gpu_time.GetValue()) { - nanoseconds /= 256; + gpu_tick /= 256; } - return nanoseconds * NsToGPUTickRatio::num / NsToGPUTickRatio::den; + return gpu_tick; } [[nodiscard]] bool IsAsync() const { -- cgit v1.2.3