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// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "common/fiber.h"
#include "common/microprofile.h"
#include "common/scope_exit.h"
#include "common/thread.h"
#include "core/core.h"
#include "core/core_timing.h"
#include "core/cpu_manager.h"
#include "core/hle/kernel/k_interrupt_manager.h"
#include "core/hle/kernel/k_scheduler.h"
#include "core/hle/kernel/k_thread.h"
#include "core/hle/kernel/kernel.h"
#include "core/hle/kernel/physical_core.h"
#include "video_core/gpu.h"
namespace Core {
CpuManager::CpuManager(System& system_) : system{system_} {}
CpuManager::~CpuManager() = default;
void CpuManager::Initialize() {
num_cores = is_multicore ? Core::Hardware::NUM_CPU_CORES : 1;
gpu_barrier = std::make_unique<Common::Barrier>(num_cores + 1);
for (std::size_t core = 0; core < num_cores; core++) {
core_data[core].host_thread =
std::jthread([this, core](std::stop_token token) { RunThread(token, core); });
}
}
void CpuManager::Shutdown() {
for (std::size_t core = 0; core < num_cores; core++) {
if (core_data[core].host_thread.joinable()) {
core_data[core].host_thread.request_stop();
core_data[core].host_thread.join();
}
}
}
void CpuManager::GuestThreadFunction() {
if (is_multicore) {
MultiCoreRunGuestThread();
} else {
SingleCoreRunGuestThread();
}
}
void CpuManager::IdleThreadFunction() {
if (is_multicore) {
MultiCoreRunIdleThread();
} else {
SingleCoreRunIdleThread();
}
}
void CpuManager::ShutdownThreadFunction() {
ShutdownThread();
}
void CpuManager::HandleInterrupt() {
auto& kernel = system.Kernel();
auto core_index = kernel.CurrentPhysicalCoreIndex();
Kernel::KInterruptManager::HandleInterrupt(kernel, static_cast<s32>(core_index));
}
///////////////////////////////////////////////////////////////////////////////
/// MultiCore ///
///////////////////////////////////////////////////////////////////////////////
void CpuManager::MultiCoreRunGuestThread() {
// Similar to UserModeThreadStarter in HOS
auto& kernel = system.Kernel();
auto* thread = Kernel::GetCurrentThreadPointer(kernel);
kernel.CurrentScheduler()->OnThreadStart();
while (true) {
auto* physical_core = &kernel.CurrentPhysicalCore();
while (!physical_core->IsInterrupted()) {
physical_core->RunThread(thread);
physical_core = &kernel.CurrentPhysicalCore();
}
HandleInterrupt();
}
}
void CpuManager::MultiCoreRunIdleThread() {
// Not accurate to HOS. Remove this entire method when singlecore is removed.
// See notes in KScheduler::ScheduleImpl for more information about why this
// is inaccurate.
auto& kernel = system.Kernel();
kernel.CurrentScheduler()->OnThreadStart();
while (true) {
auto& physical_core = kernel.CurrentPhysicalCore();
if (!physical_core.IsInterrupted()) {
physical_core.Idle();
}
HandleInterrupt();
}
}
///////////////////////////////////////////////////////////////////////////////
/// SingleCore ///
///////////////////////////////////////////////////////////////////////////////
void CpuManager::SingleCoreRunGuestThread() {
auto& kernel = system.Kernel();
auto* thread = Kernel::GetCurrentThreadPointer(kernel);
kernel.CurrentScheduler()->OnThreadStart();
while (true) {
auto* physical_core = &kernel.CurrentPhysicalCore();
if (!physical_core->IsInterrupted()) {
physical_core->RunThread(thread);
physical_core = &kernel.CurrentPhysicalCore();
}
kernel.SetIsPhantomModeForSingleCore(true);
system.CoreTiming().Advance();
kernel.SetIsPhantomModeForSingleCore(false);
PreemptSingleCore();
HandleInterrupt();
}
}
void CpuManager::SingleCoreRunIdleThread() {
auto& kernel = system.Kernel();
kernel.CurrentScheduler()->OnThreadStart();
while (true) {
PreemptSingleCore(false);
system.CoreTiming().AddTicks(1000U);
idle_count++;
HandleInterrupt();
}
}
void CpuManager::PreemptSingleCore(bool from_running_environment) {
auto& kernel = system.Kernel();
if (idle_count >= 4 || from_running_environment) {
if (!from_running_environment) {
system.CoreTiming().Idle();
idle_count = 0;
}
kernel.SetIsPhantomModeForSingleCore(true);
system.CoreTiming().Advance();
kernel.SetIsPhantomModeForSingleCore(false);
}
current_core.store((current_core + 1) % Core::Hardware::NUM_CPU_CORES);
system.CoreTiming().ResetTicks();
kernel.Scheduler(current_core).PreemptSingleCore();
// We've now been scheduled again, and we may have exchanged schedulers.
// Reload the scheduler in case it's different.
if (!kernel.Scheduler(current_core).IsIdle()) {
idle_count = 0;
}
}
void CpuManager::GuestActivate() {
// Similar to the HorizonKernelMain callback in HOS
auto& kernel = system.Kernel();
auto* scheduler = kernel.CurrentScheduler();
scheduler->Activate();
UNREACHABLE();
}
void CpuManager::ShutdownThread() {
auto& kernel = system.Kernel();
auto* thread = kernel.GetCurrentEmuThread();
auto core = is_multicore ? kernel.CurrentPhysicalCoreIndex() : 0;
Common::Fiber::YieldTo(thread->GetHostContext(), *core_data[core].host_context);
UNREACHABLE();
}
void CpuManager::RunThread(std::stop_token token, std::size_t core) {
/// Initialization
system.RegisterCoreThread(core);
std::string name;
if (is_multicore) {
name = "CPUCore_" + std::to_string(core);
} else {
name = "CPUThread";
}
MicroProfileOnThreadCreate(name.c_str());
Common::SetCurrentThreadName(name.c_str());
Common::SetCurrentThreadPriority(Common::ThreadPriority::Critical);
auto& data = core_data[core];
data.host_context = Common::Fiber::ThreadToFiber();
// Cleanup
SCOPE_EXIT {
data.host_context->Exit();
MicroProfileOnThreadExit();
};
// Running
if (!gpu_barrier->Sync(token)) {
return;
}
if (!is_async_gpu && !is_multicore) {
system.GPU().ObtainContext();
}
auto& kernel = system.Kernel();
auto& scheduler = *kernel.CurrentScheduler();
auto* thread = scheduler.GetSchedulerCurrentThread();
Kernel::SetCurrentThread(kernel, thread);
Common::Fiber::YieldTo(data.host_context, *thread->GetHostContext());
}
} // namespace Core
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