From 0624c880bd5af45ae9095465e079fa55458515f6 Mon Sep 17 00:00:00 2001 From: Liam Date: Sun, 26 Jun 2022 18:52:16 -0400 Subject: [PATCH] kernel: use KScheduler from mesosphere --- src/core/arm/arm_interface.cpp | 3 +- src/core/cpu_manager.cpp | 169 ++-- src/core/cpu_manager.h | 14 +- .../hle/kernel/global_scheduler_context.cpp | 2 +- src/core/hle/kernel/k_interrupt_manager.cpp | 7 + src/core/hle/kernel/k_scheduler.cpp | 733 +++++++++--------- src/core/hle/kernel/k_scheduler.h | 220 +++--- src/core/hle/kernel/k_scheduler_lock.h | 2 + src/core/hle/kernel/k_thread.cpp | 11 +- src/core/hle/kernel/k_thread.h | 5 + src/core/hle/kernel/kernel.cpp | 10 +- src/core/hle/kernel/svc.cpp | 7 +- 12 files changed, 572 insertions(+), 611 deletions(-) diff --git a/src/core/arm/arm_interface.cpp b/src/core/arm/arm_interface.cpp index cef79b245..cdf388fb9 100644 --- a/src/core/arm/arm_interface.cpp +++ b/src/core/arm/arm_interface.cpp @@ -155,9 +155,10 @@ void ARM_Interface::Run() { break; } - // Handle syscalls and scheduling (this may change the current thread) + // Handle syscalls and scheduling (this may change the current thread/core) if (Has(hr, svc_call)) { Kernel::Svc::Call(system, GetSvcNumber()); + break; } if (Has(hr, break_loop) || !uses_wall_clock) { break; diff --git a/src/core/cpu_manager.cpp b/src/core/cpu_manager.cpp index 37d3d83b9..428194129 100644 --- a/src/core/cpu_manager.cpp +++ b/src/core/cpu_manager.cpp @@ -8,6 +8,7 @@ #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" @@ -41,6 +42,14 @@ void CpuManager::Shutdown() { } } +void CpuManager::GuestActivateFunction() { + if (is_multicore) { + MultiCoreGuestActivate(); + } else { + SingleCoreGuestActivate(); + } +} + void CpuManager::GuestThreadFunction() { if (is_multicore) { MultiCoreRunGuestThread(); @@ -49,36 +58,49 @@ void CpuManager::GuestThreadFunction() { } } -void CpuManager::GuestRewindFunction() { - if (is_multicore) { - MultiCoreRunGuestLoop(); - } else { - SingleCoreRunGuestLoop(); - } -} - -void CpuManager::IdleThreadFunction() { - if (is_multicore) { - MultiCoreRunIdleThread(); - } else { - SingleCoreRunIdleThread(); - } -} - void CpuManager::ShutdownThreadFunction() { ShutdownThread(); } +void CpuManager::WaitForAndHandleInterrupt() { + auto& kernel = system.Kernel(); + auto& physical_core = kernel.CurrentPhysicalCore(); + + ASSERT(Kernel::GetCurrentThread(kernel).GetDisableDispatchCount() == 1); + + if (!physical_core.IsInterrupted()) { + physical_core.Idle(); + } + + HandleInterrupt(); +} + +void CpuManager::HandleInterrupt() { + auto& kernel = system.Kernel(); + auto core_index = kernel.CurrentPhysicalCoreIndex(); + + Kernel::KInterruptManager::HandleInterrupt(kernel, static_cast(core_index)); +} + /////////////////////////////////////////////////////////////////////////////// /// MultiCore /// /////////////////////////////////////////////////////////////////////////////// -void CpuManager::MultiCoreRunGuestThread() { +void CpuManager::MultiCoreGuestActivate() { + // Similar to the HorizonKernelMain callback in HOS auto& kernel = system.Kernel(); - kernel.CurrentScheduler()->OnThreadStart(); - auto* thread = kernel.CurrentScheduler()->GetSchedulerCurrentThread(); - auto& host_context = thread->GetHostContext(); - host_context->SetRewindPoint([this] { GuestRewindFunction(); }); + auto* scheduler = kernel.CurrentScheduler(); + + scheduler->Activate(); + UNREACHABLE(); +} + +void CpuManager::MultiCoreRunGuestThread() { + // Similar to UserModeThreadStarter in HOS + auto& kernel = system.Kernel(); + auto* thread = kernel.GetCurrentEmuThread(); + thread->EnableDispatch(); + MultiCoreRunGuestLoop(); } @@ -91,18 +113,8 @@ void CpuManager::MultiCoreRunGuestLoop() { physical_core->Run(); physical_core = &kernel.CurrentPhysicalCore(); } - { - Kernel::KScopedDisableDispatch dd(kernel); - physical_core->ArmInterface().ClearExclusiveState(); - } - } -} -void CpuManager::MultiCoreRunIdleThread() { - auto& kernel = system.Kernel(); - while (true) { - Kernel::KScopedDisableDispatch dd(kernel); - kernel.CurrentPhysicalCore().Idle(); + HandleInterrupt(); } } @@ -110,83 +122,20 @@ void CpuManager::MultiCoreRunIdleThread() { /// SingleCore /// /////////////////////////////////////////////////////////////////////////////// -void CpuManager::SingleCoreRunGuestThread() { - auto& kernel = system.Kernel(); - kernel.CurrentScheduler()->OnThreadStart(); - auto* thread = kernel.CurrentScheduler()->GetSchedulerCurrentThread(); - auto& host_context = thread->GetHostContext(); - host_context->SetRewindPoint([this] { GuestRewindFunction(); }); - SingleCoreRunGuestLoop(); -} +void CpuManager::SingleCoreGuestActivate() {} -void CpuManager::SingleCoreRunGuestLoop() { - auto& kernel = system.Kernel(); - while (true) { - auto* physical_core = &kernel.CurrentPhysicalCore(); - if (!physical_core->IsInterrupted()) { - physical_core->Run(); - physical_core = &kernel.CurrentPhysicalCore(); - } - kernel.SetIsPhantomModeForSingleCore(true); - system.CoreTiming().Advance(); - kernel.SetIsPhantomModeForSingleCore(false); - physical_core->ArmInterface().ClearExclusiveState(); - PreemptSingleCore(); - auto& scheduler = kernel.Scheduler(current_core); - scheduler.RescheduleCurrentCore(); - } -} +void CpuManager::SingleCoreRunGuestThread() {} -void CpuManager::SingleCoreRunIdleThread() { - auto& kernel = system.Kernel(); - while (true) { - auto& physical_core = kernel.CurrentPhysicalCore(); - PreemptSingleCore(false); - system.CoreTiming().AddTicks(1000U); - idle_count++; - auto& scheduler = physical_core.Scheduler(); - scheduler.RescheduleCurrentCore(); - } -} +void CpuManager::SingleCoreRunGuestLoop() {} -void CpuManager::PreemptSingleCore(bool from_running_enviroment) { - { - auto& kernel = system.Kernel(); - auto& scheduler = kernel.Scheduler(current_core); - Kernel::KThread* current_thread = scheduler.GetSchedulerCurrentThread(); - if (idle_count >= 4 || from_running_enviroment) { - if (!from_running_enviroment) { - 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(); - scheduler.Unload(scheduler.GetSchedulerCurrentThread()); - - auto& next_scheduler = kernel.Scheduler(current_core); - Common::Fiber::YieldTo(current_thread->GetHostContext(), *next_scheduler.ControlContext()); - } - - // May have changed scheduler - { - auto& scheduler = system.Kernel().Scheduler(current_core); - scheduler.Reload(scheduler.GetSchedulerCurrentThread()); - if (!scheduler.IsIdle()) { - idle_count = 0; - } - } -} +void CpuManager::PreemptSingleCore(bool from_running_enviroment) {} void CpuManager::ShutdownThread() { auto& kernel = system.Kernel(); + auto* thread = kernel.GetCurrentEmuThread(); auto core = is_multicore ? kernel.CurrentPhysicalCoreIndex() : 0; - auto* current_thread = kernel.GetCurrentEmuThread(); - Common::Fiber::YieldTo(current_thread->GetHostContext(), *core_data[core].host_context); + Common::Fiber::YieldTo(thread->GetHostContext(), *core_data[core].host_context); UNREACHABLE(); } @@ -218,9 +167,21 @@ void CpuManager::RunThread(std::size_t core) { system.GPU().ObtainContext(); } - auto* current_thread = system.Kernel().CurrentScheduler()->GetIdleThread(); - Kernel::SetCurrentThread(system.Kernel(), current_thread); - Common::Fiber::YieldTo(data.host_context, *current_thread->GetHostContext()); + auto& kernel = system.Kernel(); + + auto* main_thread = Kernel::KThread::Create(kernel); + main_thread->SetName(fmt::format("MainThread:{}", core)); + ASSERT(Kernel::KThread::InitializeMainThread(system, main_thread, static_cast(core)) + .IsSuccess()); + + auto* idle_thread = Kernel::KThread::Create(kernel); + ASSERT(Kernel::KThread::InitializeIdleThread(system, idle_thread, static_cast(core)) + .IsSuccess()); + + kernel.SetCurrentEmuThread(main_thread); + kernel.CurrentScheduler()->Initialize(idle_thread); + + Common::Fiber::YieldTo(data.host_context, *main_thread->GetHostContext()); } } // namespace Core diff --git a/src/core/cpu_manager.h b/src/core/cpu_manager.h index 76dc58ee1..8143424af 100644 --- a/src/core/cpu_manager.h +++ b/src/core/cpu_manager.h @@ -5,6 +5,7 @@ #include #include +#include #include #include #include @@ -47,10 +48,14 @@ public: gpu_barrier->Sync(); } + void WaitForAndHandleInterrupt(); void Initialize(); void Shutdown(); - std::function GetGuestThreadStartFunc() { + std::function GetGuestActivateFunc() { + return [this] { GuestActivateFunction(); }; + } + std::function GetGuestThreadFunc() { return [this] { GuestThreadFunction(); }; } std::function GetIdleThreadStartFunc() { @@ -67,21 +72,22 @@ public: } private: + void GuestActivateFunction(); void GuestThreadFunction(); - void GuestRewindFunction(); void IdleThreadFunction(); void ShutdownThreadFunction(); + void MultiCoreGuestActivate(); void MultiCoreRunGuestThread(); void MultiCoreRunGuestLoop(); - void MultiCoreRunIdleThread(); + void SingleCoreGuestActivate(); void SingleCoreRunGuestThread(); void SingleCoreRunGuestLoop(); - void SingleCoreRunIdleThread(); static void ThreadStart(std::stop_token stop_token, CpuManager& cpu_manager, std::size_t core); + void HandleInterrupt(); void ShutdownThread(); void RunThread(std::size_t core); diff --git a/src/core/hle/kernel/global_scheduler_context.cpp b/src/core/hle/kernel/global_scheduler_context.cpp index 164436b26..21fd5cb67 100644 --- a/src/core/hle/kernel/global_scheduler_context.cpp +++ b/src/core/hle/kernel/global_scheduler_context.cpp @@ -41,7 +41,7 @@ void GlobalSchedulerContext::PreemptThreads() { ASSERT(IsLocked()); for (u32 core_id = 0; core_id < Core::Hardware::NUM_CPU_CORES; core_id++) { const u32 priority = preemption_priorities[core_id]; - kernel.Scheduler(core_id).RotateScheduledQueue(core_id, priority); + KScheduler::RotateScheduledQueue(kernel, core_id, priority); // Signal an interrupt occurred. For core 3, this is a certainty, as preemption will result // in the rotator thread being scheduled. For cores 0-2, this is to simulate or system diff --git a/src/core/hle/kernel/k_interrupt_manager.cpp b/src/core/hle/kernel/k_interrupt_manager.cpp index d606a7f86..1b577a5b3 100644 --- a/src/core/hle/kernel/k_interrupt_manager.cpp +++ b/src/core/hle/kernel/k_interrupt_manager.cpp @@ -6,6 +6,7 @@ #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" namespace Kernel::KInterruptManager { @@ -15,6 +16,9 @@ void HandleInterrupt(KernelCore& kernel, s32 core_id) { return; } + // Acknowledge the interrupt. + kernel.PhysicalCore(core_id).ClearInterrupt(); + auto& current_thread = GetCurrentThread(kernel); // If the user disable count is set, we may need to pin the current thread. @@ -27,6 +31,9 @@ void HandleInterrupt(KernelCore& kernel, s32 core_id) { // Set the interrupt flag for the thread. GetCurrentThread(kernel).SetInterruptFlag(); } + + // Request interrupt scheduling. + kernel.CurrentScheduler()->RequestScheduleOnInterrupt(); } } // namespace Kernel::KInterruptManager diff --git a/src/core/hle/kernel/k_scheduler.cpp b/src/core/hle/kernel/k_scheduler.cpp index d599d2bcb..13915dbd9 100644 --- a/src/core/hle/kernel/k_scheduler.cpp +++ b/src/core/hle/kernel/k_scheduler.cpp @@ -27,69 +27,162 @@ static void IncrementScheduledCount(Kernel::KThread* thread) { } } -void KScheduler::RescheduleCores(KernelCore& kernel, u64 cores_pending_reschedule) { - auto scheduler = kernel.CurrentScheduler(); - - u32 current_core{0xF}; - bool must_context_switch{}; - if (scheduler) { - current_core = scheduler->core_id; - // TODO(bunnei): Should be set to true when we deprecate single core - must_context_switch = !kernel.IsPhantomModeForSingleCore(); - } - - while (cores_pending_reschedule != 0) { - const auto core = static_cast(std::countr_zero(cores_pending_reschedule)); - ASSERT(core < Core::Hardware::NUM_CPU_CORES); - if (!must_context_switch || core != current_core) { - auto& phys_core = kernel.PhysicalCore(core); - phys_core.Interrupt(); +KScheduler::KScheduler(KernelCore& kernel_) : kernel{kernel_} { + m_idle_stack = std::make_shared([this] { + while (true) { + ScheduleImplOffStack(); } - cores_pending_reschedule &= ~(1ULL << core); - } + }); - for (std::size_t core_id = 0; core_id < Core::Hardware::NUM_CPU_CORES; ++core_id) { - if (kernel.PhysicalCore(core_id).IsInterrupted()) { - KInterruptManager::HandleInterrupt(kernel, static_cast(core_id)); - } - } + m_state.needs_scheduling = true; +} - if (must_context_switch) { - auto core_scheduler = kernel.CurrentScheduler(); - kernel.ExitSVCProfile(); - core_scheduler->RescheduleCurrentCore(); - kernel.EnterSVCProfile(); +KScheduler::~KScheduler() = default; + +void KScheduler::SetInterruptTaskRunnable() { + m_state.interrupt_task_runnable = true; + m_state.needs_scheduling = true; +} + +void KScheduler::RequestScheduleOnInterrupt() { + m_state.needs_scheduling = true; + + if (CanSchedule(kernel)) { + ScheduleOnInterrupt(); } } -u64 KScheduler::UpdateHighestPriorityThread(KThread* highest_thread) { - KScopedSpinLock lk{guard}; - if (KThread* prev_highest_thread = state.highest_priority_thread; - prev_highest_thread != highest_thread) { - if (prev_highest_thread != nullptr) { - IncrementScheduledCount(prev_highest_thread); - prev_highest_thread->SetLastScheduledTick(system.CoreTiming().GetCPUTicks()); +void KScheduler::DisableScheduling(KernelCore& kernel) { + ASSERT(GetCurrentThread(kernel).GetDisableDispatchCount() >= 0); + GetCurrentThread(kernel).DisableDispatch(); +} + +void KScheduler::EnableScheduling(KernelCore& kernel, u64 cores_needing_scheduling) { + ASSERT(GetCurrentThread(kernel).GetDisableDispatchCount() >= 1); + + auto* scheduler = kernel.CurrentScheduler(); + + if (!scheduler) { + // HACK: we cannot schedule from this thread, it is not a core thread + RescheduleCores(kernel, cores_needing_scheduling); + if (GetCurrentThread(kernel).GetDisableDispatchCount() == 1) { + // Special case to ensure dummy threads that are waiting block + GetCurrentThread(kernel).IfDummyThreadTryWait(); } - if (state.should_count_idle) { - if (highest_thread != nullptr) { + GetCurrentThread(kernel).EnableDispatch(); + return; + } + + scheduler->RescheduleOtherCores(cores_needing_scheduling); + + if (GetCurrentThread(kernel).GetDisableDispatchCount() > 1) { + GetCurrentThread(kernel).EnableDispatch(); + } else { + scheduler->RescheduleCurrentCore(); + } +} + +u64 KScheduler::UpdateHighestPriorityThreads(KernelCore& kernel) { + if (IsSchedulerUpdateNeeded(kernel)) { + return UpdateHighestPriorityThreadsImpl(kernel); + } else { + return 0; + } +} + +void KScheduler::Schedule() { + ASSERT(GetCurrentThread(kernel).GetDisableDispatchCount() == 1); + ASSERT(m_core_id == GetCurrentCoreId(kernel)); + + ScheduleImpl(); +} + +void KScheduler::ScheduleOnInterrupt() { + GetCurrentThread(kernel).DisableDispatch(); + Schedule(); + GetCurrentThread(kernel).EnableDispatch(); +} + +void KScheduler::RescheduleCurrentCore() { + ASSERT(GetCurrentThread(kernel).GetDisableDispatchCount() == 1); + + GetCurrentThread(kernel).EnableDispatch(); + + if (m_state.needs_scheduling.load()) { + // Disable interrupts, and then check again if rescheduling is needed. + // KScopedInterruptDisable intr_disable; + + kernel.CurrentScheduler()->RescheduleCurrentCoreImpl(); + } +} + +void KScheduler::RescheduleCurrentCoreImpl() { + // Check that scheduling is needed. + if (m_state.needs_scheduling.load()) [[likely]] { + GetCurrentThread(kernel).DisableDispatch(); + Schedule(); + GetCurrentThread(kernel).EnableDispatch(); + } +} + +void KScheduler::Initialize(KThread* idle_thread) { + // Set core ID/idle thread/interrupt task manager. + m_core_id = GetCurrentCoreId(kernel); + m_idle_thread = idle_thread; + // m_state.idle_thread_stack = m_idle_thread->GetStackTop(); + // m_state.interrupt_task_manager = &kernel.GetInterruptTaskManager(); + + // Insert the main thread into the priority queue. + // { + // KScopedSchedulerLock lk{kernel}; + // GetPriorityQueue(kernel).PushBack(GetCurrentThreadPointer(kernel)); + // SetSchedulerUpdateNeeded(kernel); + // } + + // Bind interrupt handler. + // kernel.GetInterruptManager().BindHandler( + // GetSchedulerInterruptHandler(kernel), KInterruptName::Scheduler, m_core_id, + // KInterruptController::PriorityLevel_Scheduler, false, false); + + // Set the current thread. + m_current_thread = GetCurrentThreadPointer(kernel); +} + +void KScheduler::Activate() { + ASSERT(GetCurrentThread(kernel).GetDisableDispatchCount() == 1); + + // m_state.should_count_idle = KTargetSystem::IsDebugMode(); + m_is_active = true; + RescheduleCurrentCore(); +} + +u64 KScheduler::UpdateHighestPriorityThread(KThread* highest_thread) { + if (KThread* prev_highest_thread = m_state.highest_priority_thread; + prev_highest_thread != highest_thread) [[likely]] { + if (prev_highest_thread != nullptr) [[likely]] { + IncrementScheduledCount(prev_highest_thread); + prev_highest_thread->SetLastScheduledTick(kernel.System().CoreTiming().GetCPUTicks()); + } + if (m_state.should_count_idle) { + if (highest_thread != nullptr) [[likely]] { if (KProcess* process = highest_thread->GetOwnerProcess(); process != nullptr) { - process->SetRunningThread(core_id, highest_thread, state.idle_count); + process->SetRunningThread(m_core_id, highest_thread, m_state.idle_count); } } else { - state.idle_count++; + m_state.idle_count++; } } - state.highest_priority_thread = highest_thread; - state.needs_scheduling.store(true); - return (1ULL << core_id); + m_state.highest_priority_thread = highest_thread; + m_state.needs_scheduling = true; + return (1ULL << m_core_id); } else { return 0; } } u64 KScheduler::UpdateHighestPriorityThreadsImpl(KernelCore& kernel) { - ASSERT(kernel.GlobalSchedulerContext().IsLocked()); + ASSERT(IsSchedulerLockedByCurrentThread(kernel)); // Clear that we need to update. ClearSchedulerUpdateNeeded(kernel); @@ -98,18 +191,20 @@ u64 KScheduler::UpdateHighestPriorityThreadsImpl(KernelCore& kernel) { KThread* top_threads[Core::Hardware::NUM_CPU_CORES]; auto& priority_queue = GetPriorityQueue(kernel); - /// We want to go over all cores, finding the highest priority thread and determining if - /// scheduling is needed for that core. + // We want to go over all cores, finding the highest priority thread and determining if + // scheduling is needed for that core. for (size_t core_id = 0; core_id < Core::Hardware::NUM_CPU_CORES; core_id++) { KThread* top_thread = priority_queue.GetScheduledFront(static_cast(core_id)); if (top_thread != nullptr) { - // If the thread has no waiters, we need to check if the process has a thread pinned. - if (top_thread->GetNumKernelWaiters() == 0) { - if (KProcess* parent = top_thread->GetOwnerProcess(); parent != nullptr) { - if (KThread* pinned = parent->GetPinnedThread(static_cast(core_id)); - pinned != nullptr && pinned != top_thread) { - // We prefer our parent's pinned thread if possible. However, we also don't - // want to schedule un-runnable threads. + // We need to check if the thread's process has a pinned thread. + if (KProcess* parent = top_thread->GetOwnerProcess()) { + // Check that there's a pinned thread other than the current top thread. + if (KThread* pinned = parent->GetPinnedThread(static_cast(core_id)); + pinned != nullptr && pinned != top_thread) { + // We need to prefer threads with kernel waiters to the pinned thread. + if (top_thread->GetNumKernelWaiters() == + 0 /* && top_thread != parent->GetExceptionThread() */) { + // If the pinned thread is runnable, use it. if (pinned->GetRawState() == ThreadState::Runnable) { top_thread = pinned; } else { @@ -129,7 +224,8 @@ u64 KScheduler::UpdateHighestPriorityThreadsImpl(KernelCore& kernel) { // Idle cores are bad. We're going to try to migrate threads to each idle core in turn. while (idle_cores != 0) { - const auto core_id = static_cast(std::countr_zero(idle_cores)); + const s32 core_id = static_cast(std::countr_zero(idle_cores)); + if (KThread* suggested = priority_queue.GetSuggestedFront(core_id); suggested != nullptr) { s32 migration_candidates[Core::Hardware::NUM_CPU_CORES]; size_t num_candidates = 0; @@ -150,7 +246,6 @@ u64 KScheduler::UpdateHighestPriorityThreadsImpl(KernelCore& kernel) { // The suggested thread isn't bound to its core, so we can migrate it! suggested->SetActiveCore(core_id); priority_queue.ChangeCore(suggested_core, suggested); - top_threads[core_id] = suggested; cores_needing_scheduling |= kernel.Scheduler(core_id).UpdateHighestPriorityThread(top_threads[core_id]); @@ -183,7 +278,6 @@ u64 KScheduler::UpdateHighestPriorityThreadsImpl(KernelCore& kernel) { // Perform the migration. suggested->SetActiveCore(core_id); priority_queue.ChangeCore(candidate_core, suggested); - top_threads[core_id] = suggested; cores_needing_scheduling |= kernel.Scheduler(core_id).UpdateHighestPriorityThread( @@ -200,24 +294,223 @@ u64 KScheduler::UpdateHighestPriorityThreadsImpl(KernelCore& kernel) { return cores_needing_scheduling; } +void KScheduler::SwitchThread(KThread* next_thread) { + KProcess* const cur_process = kernel.CurrentProcess(); + KThread* const cur_thread = GetCurrentThreadPointer(kernel); + + // We never want to schedule a null thread, so use the idle thread if we don't have a next. + if (next_thread == nullptr) { + next_thread = m_idle_thread; + } + + if (next_thread->GetCurrentCore() != m_core_id) { + next_thread->SetCurrentCore(m_core_id); + } + + // If we're not actually switching thread, there's nothing to do. + if (next_thread == cur_thread) { + return; + } + + // Next thread is now known not to be nullptr, and must not be dispatchable. + ASSERT(next_thread->GetDisableDispatchCount() == 1); + ASSERT(!next_thread->IsDummyThread()); + + // Update the CPU time tracking variables. + const s64 prev_tick = m_last_context_switch_time; + const s64 cur_tick = kernel.System().CoreTiming().GetCPUTicks(); + const s64 tick_diff = cur_tick - prev_tick; + cur_thread->AddCpuTime(m_core_id, tick_diff); + if (cur_process != nullptr) { + cur_process->UpdateCPUTimeTicks(tick_diff); + } + m_last_context_switch_time = cur_tick; + + // Update our previous thread. + if (cur_process != nullptr) { + if (!cur_thread->IsTerminationRequested() && cur_thread->GetActiveCore() == m_core_id) + [[likely]] { + m_state.prev_thread = cur_thread; + } else { + m_state.prev_thread = nullptr; + } + } + + // Switch the current process, if we're switching processes. + // if (KProcess *next_process = next_thread->GetOwnerProcess(); next_process != cur_process) { + // KProcess::Switch(cur_process, next_process); + // } + + // Set the new thread. + SetCurrentThread(kernel, next_thread); + m_current_thread = next_thread; + + // Set the new Thread Local region. + // cpu::SwitchThreadLocalRegion(GetInteger(next_thread->GetThreadLocalRegionAddress())); +} + +void KScheduler::ScheduleImpl() { + // First, clear the needs scheduling bool. + m_state.needs_scheduling.store(false, std::memory_order_seq_cst); + + // Load the appropriate thread pointers for scheduling. + KThread* const cur_thread{GetCurrentThreadPointer(kernel)}; + KThread* highest_priority_thread{m_state.highest_priority_thread}; + + // Check whether there are runnable interrupt tasks. + if (m_state.interrupt_task_runnable) { + // The interrupt task is runnable. + // We want to switch to the interrupt task/idle thread. + highest_priority_thread = nullptr; + } + + // If there aren't, we want to check if the highest priority thread is the same as the current + // thread. + if (highest_priority_thread == cur_thread) { + // If they're the same, then we can just return. + return; + } + + // The highest priority thread is not the same as the current thread. + // Switch to the idle thread stack and continue executing from there. + m_idle_cur_thread = cur_thread; + m_idle_highest_priority_thread = highest_priority_thread; + Common::Fiber::YieldTo(cur_thread->host_context, *m_idle_stack); + + // Returning from ScheduleImpl occurs after this thread has been scheduled again. +} + +void KScheduler::ScheduleImplOffStack() { + KThread* const cur_thread{m_idle_cur_thread}; + KThread* highest_priority_thread{m_idle_highest_priority_thread}; + + // Get a reference to the current thread's stack parameters. + auto& sp{cur_thread->GetStackParameters()}; + + // Save the original thread context. + { + auto& physical_core = kernel.System().CurrentPhysicalCore(); + auto& cpu_core = physical_core.ArmInterface(); + cpu_core.SaveContext(cur_thread->GetContext32()); + cpu_core.SaveContext(cur_thread->GetContext64()); + // Save the TPIDR_EL0 system register in case it was modified. + cur_thread->SetTPIDR_EL0(cpu_core.GetTPIDR_EL0()); + cpu_core.ClearExclusiveState(); + } + + // Check if the thread is terminated by checking the DPC flags. + if ((sp.dpc_flags & static_cast(DpcFlag::Terminated)) == 0) { + // The thread isn't terminated, so we want to unlock it. + sp.m_lock.store(false, std::memory_order_seq_cst); + } + + // The current thread's context has been entirely taken care of. + // Now we want to loop until we successfully switch the thread context. + while (true) { + // We're starting to try to do the context switch. + // Check if the highest priority thread is null. + if (!highest_priority_thread) { + // The next thread is nullptr! + // Switch to nullptr. This will actually switch to the idle thread. + SwitchThread(nullptr); + + // We've switched to the idle thread, so we want to process interrupt tasks until we + // schedule a non-idle thread. + while (!m_state.interrupt_task_runnable) { + // Check if we need scheduling. + if (m_state.needs_scheduling.load(std::memory_order_seq_cst)) { + goto retry; + } + + // Clear the previous thread. + m_state.prev_thread = nullptr; + + // Wait for an interrupt before checking again. + kernel.System().GetCpuManager().WaitForAndHandleInterrupt(); + } + + // Execute any pending interrupt tasks. + // m_state.interrupt_task_manager->DoTasks(); + + // Clear the interrupt task thread as runnable. + m_state.interrupt_task_runnable = false; + + // Retry the scheduling loop. + goto retry; + } else { + // We want to try to lock the highest priority thread's context. + // Try to take it. + bool expected{false}; + while (!highest_priority_thread->stack_parameters.m_lock.compare_exchange_strong( + expected, true, std::memory_order_seq_cst)) { + // The highest priority thread's context is already locked. + // Check if we need scheduling. If we don't, we can retry directly. + if (m_state.needs_scheduling.load(std::memory_order_seq_cst)) { + // If we do, another core is interfering, and we must start again. + goto retry; + } + expected = false; + } + + // It's time to switch the thread. + // Switch to the highest priority thread. + SwitchThread(highest_priority_thread); + + // Check if we need scheduling. If we do, then we can't complete the switch and should + // retry. + if (m_state.needs_scheduling.load(std::memory_order_seq_cst)) { + // Our switch failed. + // We should unlock the thread context, and then retry. + highest_priority_thread->stack_parameters.m_lock.store(false, + std::memory_order_seq_cst); + goto retry; + } else { + break; + } + } + + retry: + + // We failed to successfully do the context switch, and need to retry. + // Clear needs_scheduling. + m_state.needs_scheduling.store(false, std::memory_order_seq_cst); + + // Refresh the highest priority thread. + highest_priority_thread = m_state.highest_priority_thread; + } + + // Reload the guest thread context. + { + auto& cpu_core = kernel.System().CurrentArmInterface(); + cpu_core.LoadContext(highest_priority_thread->GetContext32()); + cpu_core.LoadContext(highest_priority_thread->GetContext64()); + cpu_core.SetTlsAddress(highest_priority_thread->GetTLSAddress()); + cpu_core.SetTPIDR_EL0(highest_priority_thread->GetTPIDR_EL0()); + cpu_core.LoadWatchpointArray(highest_priority_thread->GetOwnerProcess()->GetWatchpoints()); + cpu_core.ClearExclusiveState(); + } + + // Reload the host thread. + Common::Fiber::YieldTo(m_idle_stack, *highest_priority_thread->host_context); +} + void KScheduler::ClearPreviousThread(KernelCore& kernel, KThread* thread) { - ASSERT(kernel.GlobalSchedulerContext().IsLocked()); + ASSERT(IsSchedulerLockedByCurrentThread(kernel)); for (size_t i = 0; i < Core::Hardware::NUM_CPU_CORES; ++i) { // Get an atomic reference to the core scheduler's previous thread. - std::atomic_ref prev_thread(kernel.Scheduler(static_cast(i)).prev_thread); - static_assert(std::atomic_ref::is_always_lock_free); + auto& prev_thread{kernel.Scheduler(i).m_state.prev_thread}; // Atomically clear the previous thread if it's our target. KThread* compare = thread; - prev_thread.compare_exchange_strong(compare, nullptr); + prev_thread.compare_exchange_strong(compare, nullptr, std::memory_order_seq_cst); } } void KScheduler::OnThreadStateChanged(KernelCore& kernel, KThread* thread, ThreadState old_state) { - ASSERT(kernel.GlobalSchedulerContext().IsLocked()); + ASSERT(IsSchedulerLockedByCurrentThread(kernel)); // Check if the state has changed, because if it hasn't there's nothing to do. - const auto cur_state = thread->GetRawState(); + const ThreadState cur_state = thread->GetRawState(); if (cur_state == old_state) { return; } @@ -237,12 +530,12 @@ void KScheduler::OnThreadStateChanged(KernelCore& kernel, KThread* thread, Threa } void KScheduler::OnThreadPriorityChanged(KernelCore& kernel, KThread* thread, s32 old_priority) { - ASSERT(kernel.GlobalSchedulerContext().IsLocked()); + ASSERT(IsSchedulerLockedByCurrentThread(kernel)); // If the thread is runnable, we want to change its priority in the queue. if (thread->GetRawState() == ThreadState::Runnable) { GetPriorityQueue(kernel).ChangePriority(old_priority, - thread == kernel.GetCurrentEmuThread(), thread); + thread == GetCurrentThreadPointer(kernel), thread); IncrementScheduledCount(thread); SetSchedulerUpdateNeeded(kernel); } @@ -250,7 +543,7 @@ void KScheduler::OnThreadPriorityChanged(KernelCore& kernel, KThread* thread, s3 void KScheduler::OnThreadAffinityMaskChanged(KernelCore& kernel, KThread* thread, const KAffinityMask& old_affinity, s32 old_core) { - ASSERT(kernel.GlobalSchedulerContext().IsLocked()); + ASSERT(IsSchedulerLockedByCurrentThread(kernel)); // If the thread is runnable, we want to change its affinity in the queue. if (thread->GetRawState() == ThreadState::Runnable) { @@ -260,15 +553,14 @@ void KScheduler::OnThreadAffinityMaskChanged(KernelCore& kernel, KThread* thread } } -void KScheduler::RotateScheduledQueue(s32 cpu_core_id, s32 priority) { - ASSERT(system.GlobalSchedulerContext().IsLocked()); +void KScheduler::RotateScheduledQueue(KernelCore& kernel, s32 core_id, s32 priority) { + ASSERT(IsSchedulerLockedByCurrentThread(kernel)); // Get a reference to the priority queue. - auto& kernel = system.Kernel(); auto& priority_queue = GetPriorityQueue(kernel); // Rotate the front of the queue to the end. - KThread* top_thread = priority_queue.GetScheduledFront(cpu_core_id, priority); + KThread* top_thread = priority_queue.GetScheduledFront(core_id, priority); KThread* next_thread = nullptr; if (top_thread != nullptr) { next_thread = priority_queue.MoveToScheduledBack(top_thread); @@ -280,7 +572,7 @@ void KScheduler::RotateScheduledQueue(s32 cpu_core_id, s32 priority) { // While we have a suggested thread, try to migrate it! { - KThread* suggested = priority_queue.GetSuggestedFront(cpu_core_id, priority); + KThread* suggested = priority_queue.GetSuggestedFront(core_id, priority); while (suggested != nullptr) { // Check if the suggested thread is the top thread on its core. const s32 suggested_core = suggested->GetActiveCore(); @@ -301,7 +593,7 @@ void KScheduler::RotateScheduledQueue(s32 cpu_core_id, s32 priority) { // to the front of the queue. if (top_on_suggested_core == nullptr || top_on_suggested_core->GetPriority() >= HighestCoreMigrationAllowedPriority) { - suggested->SetActiveCore(cpu_core_id); + suggested->SetActiveCore(core_id); priority_queue.ChangeCore(suggested_core, suggested, true); IncrementScheduledCount(suggested); break; @@ -309,22 +601,21 @@ void KScheduler::RotateScheduledQueue(s32 cpu_core_id, s32 priority) { } // Get the next suggestion. - suggested = priority_queue.GetSamePriorityNext(cpu_core_id, suggested); + suggested = priority_queue.GetSamePriorityNext(core_id, suggested); } } // Now that we might have migrated a thread with the same priority, check if we can do better. - { - KThread* best_thread = priority_queue.GetScheduledFront(cpu_core_id); + KThread* best_thread = priority_queue.GetScheduledFront(core_id); if (best_thread == GetCurrentThreadPointer(kernel)) { - best_thread = priority_queue.GetScheduledNext(cpu_core_id, best_thread); + best_thread = priority_queue.GetScheduledNext(core_id, best_thread); } // If the best thread we can choose has a priority the same or worse than ours, try to // migrate a higher priority thread. if (best_thread != nullptr && best_thread->GetPriority() >= priority) { - KThread* suggested = priority_queue.GetSuggestedFront(cpu_core_id); + KThread* suggested = priority_queue.GetSuggestedFront(core_id); while (suggested != nullptr) { // If the suggestion's priority is the same as ours, don't bother. if (suggested->GetPriority() >= best_thread->GetPriority()) { @@ -343,7 +634,7 @@ void KScheduler::RotateScheduledQueue(s32 cpu_core_id, s32 priority) { if (top_on_suggested_core == nullptr || top_on_suggested_core->GetPriority() >= HighestCoreMigrationAllowedPriority) { - suggested->SetActiveCore(cpu_core_id); + suggested->SetActiveCore(core_id); priority_queue.ChangeCore(suggested_core, suggested, true); IncrementScheduledCount(suggested); break; @@ -351,7 +642,7 @@ void KScheduler::RotateScheduledQueue(s32 cpu_core_id, s32 priority) { } // Get the next suggestion. - suggested = priority_queue.GetSuggestedNext(cpu_core_id, suggested); + suggested = priority_queue.GetSuggestedNext(core_id, suggested); } } } @@ -360,64 +651,6 @@ void KScheduler::RotateScheduledQueue(s32 cpu_core_id, s32 priority) { SetSchedulerUpdateNeeded(kernel); } -bool KScheduler::CanSchedule(KernelCore& kernel) { - return kernel.GetCurrentEmuThread()->GetDisableDispatchCount() <= 1; -} - -bool KScheduler::IsSchedulerUpdateNeeded(const KernelCore& kernel) { - return kernel.GlobalSchedulerContext().scheduler_update_needed.load(std::memory_order_acquire); -} - -void KScheduler::SetSchedulerUpdateNeeded(KernelCore& kernel) { - kernel.GlobalSchedulerContext().scheduler_update_needed.store(true, std::memory_order_release); -} - -void KScheduler::ClearSchedulerUpdateNeeded(KernelCore& kernel) { - kernel.GlobalSchedulerContext().scheduler_update_needed.store(false, std::memory_order_release); -} - -void KScheduler::DisableScheduling(KernelCore& kernel) { - // If we are shutting down the kernel, none of this is relevant anymore. - if (kernel.IsShuttingDown()) { - return; - } - - ASSERT(GetCurrentThreadPointer(kernel)->GetDisableDispatchCount() >= 0); - GetCurrentThreadPointer(kernel)->DisableDispatch(); -} - -void KScheduler::EnableScheduling(KernelCore& kernel, u64 cores_needing_scheduling) { - // If we are shutting down the kernel, none of this is relevant anymore. - if (kernel.IsShuttingDown()) { - return; - } - - auto* current_thread = GetCurrentThreadPointer(kernel); - - ASSERT(current_thread->GetDisableDispatchCount() >= 1); - - if (current_thread->GetDisableDispatchCount() > 1) { - current_thread->EnableDispatch(); - } else { - RescheduleCores(kernel, cores_needing_scheduling); - } - - // Special case to ensure dummy threads that are waiting block. - current_thread->IfDummyThreadTryWait(); -} - -u64 KScheduler::UpdateHighestPriorityThreads(KernelCore& kernel) { - if (IsSchedulerUpdateNeeded(kernel)) { - return UpdateHighestPriorityThreadsImpl(kernel); - } else { - return 0; - } -} - -KSchedulerPriorityQueue& KScheduler::GetPriorityQueue(KernelCore& kernel) { - return kernel.GlobalSchedulerContext().priority_queue; -} - void KScheduler::YieldWithoutCoreMigration(KernelCore& kernel) { // Validate preconditions. ASSERT(CanSchedule(kernel)); @@ -437,7 +670,7 @@ void KScheduler::YieldWithoutCoreMigration(KernelCore& kernel) { // Perform the yield. { - KScopedSchedulerLock lock(kernel); + KScopedSchedulerLock sl{kernel}; const auto cur_state = cur_thread.GetRawState(); if (cur_state == ThreadState::Runnable) { @@ -476,7 +709,7 @@ void KScheduler::YieldWithCoreMigration(KernelCore& kernel) { // Perform the yield. { - KScopedSchedulerLock lock(kernel); + KScopedSchedulerLock sl{kernel}; const auto cur_state = cur_thread.GetRawState(); if (cur_state == ThreadState::Runnable) { @@ -496,7 +729,7 @@ void KScheduler::YieldWithCoreMigration(KernelCore& kernel) { if (KThread* running_on_suggested_core = (suggested_core >= 0) - ? kernel.Scheduler(suggested_core).state.highest_priority_thread + ? kernel.Scheduler(suggested_core).m_state.highest_priority_thread : nullptr; running_on_suggested_core != suggested) { // If the current thread's priority is higher than our suggestion's we prefer @@ -564,7 +797,7 @@ void KScheduler::YieldToAnyThread(KernelCore& kernel) { // Perform the yield. { - KScopedSchedulerLock lock(kernel); + KScopedSchedulerLock sl{kernel}; const auto cur_state = cur_thread.GetRawState(); if (cur_state == ThreadState::Runnable) { @@ -621,223 +854,19 @@ void KScheduler::YieldToAnyThread(KernelCore& kernel) { } } -KScheduler::KScheduler(Core::System& system_, s32 core_id_) : system{system_}, core_id{core_id_} { - switch_fiber = std::make_shared([this] { SwitchToCurrent(); }); - state.needs_scheduling.store(true); - state.interrupt_task_thread_runnable = false; - state.should_count_idle = false; - state.idle_count = 0; - state.idle_thread_stack = nullptr; - state.highest_priority_thread = nullptr; -} - -void KScheduler::Finalize() { - if (idle_thread) { - idle_thread->Close(); - idle_thread = nullptr; +void KScheduler::RescheduleOtherCores(u64 cores_needing_scheduling) { + if (const u64 core_mask = cores_needing_scheduling & ~(1ULL << m_core_id); core_mask != 0) { + RescheduleCores(kernel, core_mask); } } -KScheduler::~KScheduler() { - ASSERT(!idle_thread); -} - -KThread* KScheduler::GetSchedulerCurrentThread() const { - if (auto result = current_thread.load(); result) { - return result; - } - return idle_thread; -} - -u64 KScheduler::GetLastContextSwitchTicks() const { - return last_context_switch_time; -} - -void KScheduler::RescheduleCurrentCore() { - ASSERT(GetCurrentThread(system.Kernel()).GetDisableDispatchCount() == 1); - - auto& phys_core = system.Kernel().PhysicalCore(core_id); - if (phys_core.IsInterrupted()) { - phys_core.ClearInterrupt(); - } - - guard.Lock(); - if (state.needs_scheduling.load()) { - Schedule(); - } else { - GetCurrentThread(system.Kernel()).EnableDispatch(); - guard.Unlock(); - } -} - -void KScheduler::OnThreadStart() { - SwitchContextStep2(); -} - -void KScheduler::Unload(KThread* thread) { - ASSERT(thread); - - LOG_TRACE(Kernel, "core {}, unload thread {}", core_id, thread ? thread->GetName() : "nullptr"); - - if (thread->IsCallingSvc()) { - thread->ClearIsCallingSvc(); - } - - auto& physical_core = system.Kernel().PhysicalCore(core_id); - if (!physical_core.IsInitialized()) { - return; - } - - Core::ARM_Interface& cpu_core = physical_core.ArmInterface(); - cpu_core.SaveContext(thread->GetContext32()); - cpu_core.SaveContext(thread->GetContext64()); - // Save the TPIDR_EL0 system register in case it was modified. - thread->SetTPIDR_EL0(cpu_core.GetTPIDR_EL0()); - cpu_core.ClearExclusiveState(); - - if (!thread->IsTerminationRequested() && thread->GetActiveCore() == core_id) { - prev_thread = thread; - } else { - prev_thread = nullptr; - } - - thread->context_guard.unlock(); -} - -void KScheduler::Reload(KThread* thread) { - LOG_TRACE(Kernel, "core {}, reload thread {}", core_id, thread->GetName()); - - Core::ARM_Interface& cpu_core = system.ArmInterface(core_id); - cpu_core.LoadContext(thread->GetContext32()); - cpu_core.LoadContext(thread->GetContext64()); - cpu_core.LoadWatchpointArray(thread->GetOwnerProcess()->GetWatchpoints()); - cpu_core.SetTlsAddress(thread->GetTLSAddress()); - cpu_core.SetTPIDR_EL0(thread->GetTPIDR_EL0()); - cpu_core.ClearExclusiveState(); -} - -void KScheduler::SwitchContextStep2() { - // Load context of new thread - Reload(GetCurrentThreadPointer(system.Kernel())); - - RescheduleCurrentCore(); -} - -void KScheduler::Schedule() { - ASSERT(GetCurrentThread(system.Kernel()).GetDisableDispatchCount() == 1); - this->ScheduleImpl(); -} - -void KScheduler::ScheduleImpl() { - KThread* previous_thread = GetCurrentThreadPointer(system.Kernel()); - KThread* next_thread = state.highest_priority_thread; - - state.needs_scheduling.store(false); - - // We never want to schedule a null thread, so use the idle thread if we don't have a next. - if (next_thread == nullptr) { - next_thread = idle_thread; - } - - if (next_thread->GetCurrentCore() != core_id) { - next_thread->SetCurrentCore(core_id); - } - - // We never want to schedule a dummy thread, as these are only used by host threads for locking. - if (next_thread->GetThreadType() == ThreadType::Dummy) { - ASSERT_MSG(false, "Dummy threads should never be scheduled!"); - next_thread = idle_thread; - } - - // If we're not actually switching thread, there's nothing to do. - if (next_thread == current_thread.load()) { - previous_thread->EnableDispatch(); - guard.Unlock(); - return; - } - - // Update the CPU time tracking variables. - KProcess* const previous_process = system.Kernel().CurrentProcess(); - UpdateLastContextSwitchTime(previous_thread, previous_process); - - // Save context for previous thread - Unload(previous_thread); - - std::shared_ptr* old_context; - old_context = &previous_thread->GetHostContext(); - - // Set the new thread. - SetCurrentThread(system.Kernel(), next_thread); - current_thread.store(next_thread); - - guard.Unlock(); - - Common::Fiber::YieldTo(*old_context, *switch_fiber); - /// When a thread wakes up, the scheduler may have changed to other in another core. - auto& next_scheduler = *system.Kernel().CurrentScheduler(); - next_scheduler.SwitchContextStep2(); -} - -void KScheduler::SwitchToCurrent() { - while (true) { - { - KScopedSpinLock lk{guard}; - current_thread.store(state.highest_priority_thread); - state.needs_scheduling.store(false); +void KScheduler::RescheduleCores(KernelCore& kernel, u64 core_mask) { + // Send IPI + for (size_t i = 0; i < Core::Hardware::NUM_CPU_CORES; i++) { + if (core_mask & (1ULL << i)) { + kernel.PhysicalCore(i).Interrupt(); } - const auto is_switch_pending = [this] { - KScopedSpinLock lk{guard}; - return state.needs_scheduling.load(); - }; - do { - auto next_thread = current_thread.load(); - if (next_thread != nullptr) { - const auto locked = next_thread->context_guard.try_lock(); - if (state.needs_scheduling.load()) { - next_thread->context_guard.unlock(); - break; - } - if (next_thread->GetActiveCore() != core_id) { - next_thread->context_guard.unlock(); - break; - } - if (!locked) { - continue; - } - } - auto thread = next_thread ? next_thread : idle_thread; - SetCurrentThread(system.Kernel(), thread); - Common::Fiber::YieldTo(switch_fiber, *thread->GetHostContext()); - } while (!is_switch_pending()); } } -void KScheduler::UpdateLastContextSwitchTime(KThread* thread, KProcess* process) { - const u64 prev_switch_ticks = last_context_switch_time; - const u64 most_recent_switch_ticks = system.CoreTiming().GetCPUTicks(); - const u64 update_ticks = most_recent_switch_ticks - prev_switch_ticks; - - if (thread != nullptr) { - thread->AddCpuTime(core_id, update_ticks); - } - - if (process != nullptr) { - process->UpdateCPUTimeTicks(update_ticks); - } - - last_context_switch_time = most_recent_switch_ticks; -} - -void KScheduler::Initialize() { - idle_thread = KThread::Create(system.Kernel()); - ASSERT(KThread::InitializeIdleThread(system, idle_thread, core_id).IsSuccess()); - idle_thread->SetName(fmt::format("IdleThread:{}", core_id)); - idle_thread->EnableDispatch(); -} - -KScopedSchedulerLock::KScopedSchedulerLock(KernelCore& kernel) - : KScopedLock(kernel.GlobalSchedulerContext().SchedulerLock()) {} - -KScopedSchedulerLock::~KScopedSchedulerLock() = default; - } // namespace Kernel diff --git a/src/core/hle/kernel/k_scheduler.h b/src/core/hle/kernel/k_scheduler.h index 6a4760eca..8f4eebf6a 100644 --- a/src/core/hle/kernel/k_scheduler.h +++ b/src/core/hle/kernel/k_scheduler.h @@ -11,6 +11,7 @@ #include "core/hle/kernel/k_scheduler_lock.h" #include "core/hle/kernel/k_scoped_lock.h" #include "core/hle/kernel/k_spin_lock.h" +#include "core/hle/kernel/k_thread.h" namespace Common { class Fiber; @@ -23,184 +24,139 @@ class System; namespace Kernel { class KernelCore; +class KInterruptTaskManager; class KProcess; -class SchedulerLock; class KThread; +class KScopedDisableDispatch; +class KScopedSchedulerLock; +class KScopedSchedulerLockAndSleep; class KScheduler final { public: - explicit KScheduler(Core::System& system_, s32 core_id_); + YUZU_NON_COPYABLE(KScheduler); + YUZU_NON_MOVEABLE(KScheduler); + + using LockType = KAbstractSchedulerLock; + + explicit KScheduler(KernelCore& kernel); ~KScheduler(); - void Finalize(); + void Initialize(KThread* idle_thread); + void Activate(); - /// Reschedules to the next available thread (call after current thread is suspended) - void RescheduleCurrentCore(); + void SetInterruptTaskRunnable(); + void RequestScheduleOnInterrupt(); - /// Reschedules cores pending reschedule, to be called on EnableScheduling. - static void RescheduleCores(KernelCore& kernel, u64 cores_pending_reschedule); - - /// The next two are for SingleCore Only. - /// Unload current thread before preempting core. - void Unload(KThread* thread); - - /// Reload current thread after core preemption. - void Reload(KThread* thread); - - /// Gets the current running thread - [[nodiscard]] KThread* GetSchedulerCurrentThread() const; - - /// Gets the idle thread - [[nodiscard]] KThread* GetIdleThread() const { - return idle_thread; + u64 GetIdleCount() { + return m_state.idle_count; } - /// Returns true if the scheduler is idle - [[nodiscard]] bool IsIdle() const { - return GetSchedulerCurrentThread() == idle_thread; + KThread* GetIdleThread() const { + return m_idle_thread; } - /// Gets the timestamp for the last context switch in ticks. - [[nodiscard]] u64 GetLastContextSwitchTicks() const; - - [[nodiscard]] bool ContextSwitchPending() const { - return state.needs_scheduling.load(std::memory_order_relaxed); + KThread* GetPreviousThread() const { + return m_state.prev_thread; } - void Initialize(); - - void OnThreadStart(); - - [[nodiscard]] std::shared_ptr& ControlContext() { - return switch_fiber; + KThread* GetSchedulerCurrentThread() const { + return m_current_thread.load(); } - [[nodiscard]] const std::shared_ptr& ControlContext() const { - return switch_fiber; + s64 GetLastContextSwitchTime() const { + return m_last_context_switch_time; } - [[nodiscard]] u64 UpdateHighestPriorityThread(KThread* highest_thread); + // Static public API. + static bool CanSchedule(KernelCore& kernel) { + return kernel.GetCurrentEmuThread()->GetDisableDispatchCount() == 0; + } + static bool IsSchedulerLockedByCurrentThread(KernelCore& kernel) { + return kernel.GlobalSchedulerContext().scheduler_lock.IsLockedByCurrentThread(); + } - /** - * Takes a thread and moves it to the back of the it's priority list. - * - * @note This operation can be redundant and no scheduling is changed if marked as so. - */ - static void YieldWithoutCoreMigration(KernelCore& kernel); + static bool IsSchedulerUpdateNeeded(KernelCore& kernel) { + return kernel.GlobalSchedulerContext().scheduler_update_needed; + } + static void SetSchedulerUpdateNeeded(KernelCore& kernel) { + kernel.GlobalSchedulerContext().scheduler_update_needed = true; + } + static void ClearSchedulerUpdateNeeded(KernelCore& kernel) { + kernel.GlobalSchedulerContext().scheduler_update_needed = false; + } - /** - * Takes a thread and moves it to the back of the it's priority list. - * Afterwards, tries to pick a suggested thread from the suggested queue that has worse time or - * a better priority than the next thread in the core. - * - * @note This operation can be redundant and no scheduling is changed if marked as so. - */ - static void YieldWithCoreMigration(KernelCore& kernel); + static void DisableScheduling(KernelCore& kernel); + static void EnableScheduling(KernelCore& kernel, u64 cores_needing_scheduling); - /** - * Takes a thread and moves it out of the scheduling queue. - * and into the suggested queue. If no thread can be scheduled afterwards in that core, - * a suggested thread is obtained instead. - * - * @note This operation can be redundant and no scheduling is changed if marked as so. - */ - static void YieldToAnyThread(KernelCore& kernel); + static u64 UpdateHighestPriorityThreads(KernelCore& kernel); static void ClearPreviousThread(KernelCore& kernel, KThread* thread); - /// Notify the scheduler a thread's status has changed. static void OnThreadStateChanged(KernelCore& kernel, KThread* thread, ThreadState old_state); - - /// Notify the scheduler a thread's priority has changed. static void OnThreadPriorityChanged(KernelCore& kernel, KThread* thread, s32 old_priority); - - /// Notify the scheduler a thread's core and/or affinity mask has changed. static void OnThreadAffinityMaskChanged(KernelCore& kernel, KThread* thread, const KAffinityMask& old_affinity, s32 old_core); - static bool CanSchedule(KernelCore& kernel); - static bool IsSchedulerUpdateNeeded(const KernelCore& kernel); - static void SetSchedulerUpdateNeeded(KernelCore& kernel); - static void ClearSchedulerUpdateNeeded(KernelCore& kernel); - static void DisableScheduling(KernelCore& kernel); - static void EnableScheduling(KernelCore& kernel, u64 cores_needing_scheduling); - [[nodiscard]] static u64 UpdateHighestPriorityThreads(KernelCore& kernel); + static void RotateScheduledQueue(KernelCore& kernel, s32 core_id, s32 priority); + static void RescheduleCores(KernelCore& kernel, u64 cores_needing_scheduling); + + static void YieldWithoutCoreMigration(KernelCore& kernel); + static void YieldWithCoreMigration(KernelCore& kernel); + static void YieldToAnyThread(KernelCore& kernel); private: - friend class GlobalSchedulerContext; + // Static private API. + static KSchedulerPriorityQueue& GetPriorityQueue(KernelCore& kernel) { + return kernel.GlobalSchedulerContext().priority_queue; + } + static u64 UpdateHighestPriorityThreadsImpl(KernelCore& kernel); - /** - * Takes care of selecting the new scheduled threads in three steps: - * - * 1. First a thread is selected from the top of the priority queue. If no thread - * is obtained then we move to step two, else we are done. - * - * 2. Second we try to get a suggested thread that's not assigned to any core or - * that is not the top thread in that core. - * - * 3. Third is no suggested thread is found, we do a second pass and pick a running - * thread in another core and swap it with its current thread. - * - * returns the cores needing scheduling. - */ - [[nodiscard]] static u64 UpdateHighestPriorityThreadsImpl(KernelCore& kernel); - - [[nodiscard]] static KSchedulerPriorityQueue& GetPriorityQueue(KernelCore& kernel); - - void RotateScheduledQueue(s32 cpu_core_id, s32 priority); + // Instanced private API. + void ScheduleImpl(); + void ScheduleImplOffStack(); + void SwitchThread(KThread* next_thread); void Schedule(); + void ScheduleOnInterrupt(); - /// Switches the CPU's active thread context to that of the specified thread - void ScheduleImpl(); + void RescheduleOtherCores(u64 cores_needing_scheduling); + void RescheduleCurrentCore(); + void RescheduleCurrentCoreImpl(); - /// When a thread wakes up, it must run this through it's new scheduler - void SwitchContextStep2(); + u64 UpdateHighestPriorityThread(KThread* thread); - /** - * Called on every context switch to update the internal timestamp - * This also updates the running time ticks for the given thread and - * process using the following difference: - * - * ticks += most_recent_ticks - last_context_switch_ticks - * - * The internal tick timestamp for the scheduler is simply the - * most recent tick count retrieved. No special arithmetic is - * applied to it. - */ - void UpdateLastContextSwitchTime(KThread* thread, KProcess* process); - - void SwitchToCurrent(); - - KThread* prev_thread{}; - std::atomic current_thread{}; - - KThread* idle_thread{}; - - std::shared_ptr switch_fiber{}; +private: + friend class KScopedDisableDispatch; struct SchedulingState { - std::atomic needs_scheduling{}; - bool interrupt_task_thread_runnable{}; - bool should_count_idle{}; - u64 idle_count{}; - KThread* highest_priority_thread{}; - void* idle_thread_stack{}; + std::atomic needs_scheduling{false}; + bool interrupt_task_runnable{false}; + bool should_count_idle{false}; + u64 idle_count{0}; + KThread* highest_priority_thread{nullptr}; + void* idle_thread_stack{nullptr}; + std::atomic prev_thread{nullptr}; + KInterruptTaskManager* interrupt_task_manager{nullptr}; }; - SchedulingState state; + KernelCore& kernel; + SchedulingState m_state; + bool m_is_active{false}; + s32 m_core_id{0}; + s64 m_last_context_switch_time{0}; + KThread* m_idle_thread{nullptr}; + std::atomic m_current_thread{nullptr}; - Core::System& system; - u64 last_context_switch_time{}; - const s32 core_id; - - KSpinLock guard{}; + std::shared_ptr m_idle_stack{}; + KThread* m_idle_cur_thread{}; + KThread* m_idle_highest_priority_thread{}; }; -class [[nodiscard]] KScopedSchedulerLock : KScopedLock { +class KScopedSchedulerLock : public KScopedLock { public: - explicit KScopedSchedulerLock(KernelCore& kernel); - ~KScopedSchedulerLock(); + explicit KScopedSchedulerLock(KernelCore& kernel) + : KScopedLock(kernel.GlobalSchedulerContext().scheduler_lock) {} + ~KScopedSchedulerLock() = default; }; } // namespace Kernel diff --git a/src/core/hle/kernel/k_scheduler_lock.h b/src/core/hle/kernel/k_scheduler_lock.h index 4fa256970..73314b45e 100644 --- a/src/core/hle/kernel/k_scheduler_lock.h +++ b/src/core/hle/kernel/k_scheduler_lock.h @@ -5,9 +5,11 @@ #include #include "common/assert.h" +#include "core/hle/kernel/k_interrupt_manager.h" #include "core/hle/kernel/k_spin_lock.h" #include "core/hle/kernel/k_thread.h" #include "core/hle/kernel/kernel.h" +#include "core/hle/kernel/physical_core.h" namespace Kernel { diff --git a/src/core/hle/kernel/k_thread.cpp b/src/core/hle/kernel/k_thread.cpp index 90de86770..9daa589b5 100644 --- a/src/core/hle/kernel/k_thread.cpp +++ b/src/core/hle/kernel/k_thread.cpp @@ -261,9 +261,14 @@ Result KThread::InitializeDummyThread(KThread* thread) { return thread->Initialize({}, {}, {}, DummyThreadPriority, 3, {}, ThreadType::Dummy); } +Result KThread::InitializeMainThread(Core::System& system, KThread* thread, s32 virt_core) { + return InitializeThread(thread, {}, {}, {}, IdleThreadPriority, virt_core, {}, ThreadType::Main, + system.GetCpuManager().GetGuestActivateFunc()); +} + Result KThread::InitializeIdleThread(Core::System& system, KThread* thread, s32 virt_core) { return InitializeThread(thread, {}, {}, {}, IdleThreadPriority, virt_core, {}, ThreadType::Main, - system.GetCpuManager().GetIdleThreadStartFunc()); + abort); } Result KThread::InitializeHighPriorityThread(Core::System& system, KThread* thread, @@ -277,7 +282,7 @@ Result KThread::InitializeUserThread(Core::System& system, KThread* thread, KThr KProcess* owner) { system.Kernel().GlobalSchedulerContext().AddThread(thread); return InitializeThread(thread, func, arg, user_stack_top, prio, virt_core, owner, - ThreadType::User, system.GetCpuManager().GetGuestThreadStartFunc()); + ThreadType::User, system.GetCpuManager().GetGuestThreadFunc()); } void KThread::PostDestroy(uintptr_t arg) { @@ -1058,6 +1063,8 @@ void KThread::Exit() { // Register the thread as a work task. KWorkerTaskManager::AddTask(kernel, KWorkerTaskManager::WorkerType::Exit, this); } + + UNREACHABLE_MSG("KThread::Exit() would return"); } Result KThread::Sleep(s64 timeout) { diff --git a/src/core/hle/kernel/k_thread.h b/src/core/hle/kernel/k_thread.h index 28cd7ecb0..416a861a9 100644 --- a/src/core/hle/kernel/k_thread.h +++ b/src/core/hle/kernel/k_thread.h @@ -110,6 +110,7 @@ void SetCurrentThread(KernelCore& kernel, KThread* thread); [[nodiscard]] KThread* GetCurrentThreadPointer(KernelCore& kernel); [[nodiscard]] KThread& GetCurrentThread(KernelCore& kernel); [[nodiscard]] s32 GetCurrentCoreId(KernelCore& kernel); +size_t CaptureBacktrace(void** buffer, size_t max); class KThread final : public KAutoObjectWithSlabHeapAndContainer, public boost::intrusive::list_base_hook<> { @@ -413,6 +414,9 @@ public: [[nodiscard]] static Result InitializeDummyThread(KThread* thread); + [[nodiscard]] static Result InitializeMainThread(Core::System& system, KThread* thread, + s32 virt_core); + [[nodiscard]] static Result InitializeIdleThread(Core::System& system, KThread* thread, s32 virt_core); @@ -435,6 +439,7 @@ public: bool is_pinned; s32 disable_count; KThread* cur_thread; + std::atomic m_lock; }; [[nodiscard]] StackParameters& GetStackParameters() { diff --git a/src/core/hle/kernel/kernel.cpp b/src/core/hle/kernel/kernel.cpp index 7307cf262..10e1f47f6 100644 --- a/src/core/hle/kernel/kernel.cpp +++ b/src/core/hle/kernel/kernel.cpp @@ -75,7 +75,6 @@ struct KernelCore::Impl { InitializeSystemResourceLimit(kernel, system.CoreTiming()); InitializeMemoryLayout(); Init::InitializeKPageBufferSlabHeap(system); - InitializeSchedulers(); InitializeShutdownThreads(); InitializePreemption(kernel); @@ -148,7 +147,6 @@ struct KernelCore::Impl { shutdown_threads[core_id] = nullptr; } - schedulers[core_id]->Finalize(); schedulers[core_id].reset(); } @@ -195,17 +193,11 @@ struct KernelCore::Impl { exclusive_monitor = Core::MakeExclusiveMonitor(system.Memory(), Core::Hardware::NUM_CPU_CORES); for (u32 i = 0; i < Core::Hardware::NUM_CPU_CORES; i++) { - schedulers[i] = std::make_unique(system, i); + schedulers[i] = std::make_unique(system.Kernel()); cores.emplace_back(i, system, *schedulers[i], interrupts); } } - void InitializeSchedulers() { - for (u32 i = 0; i < Core::Hardware::NUM_CPU_CORES; i++) { - cores[i].Scheduler().Initialize(); - } - } - // Creates the default system resource limit void InitializeSystemResourceLimit(KernelCore& kernel, const Core::Timing::CoreTiming& core_timing) { diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp index 8655506b0..27e5a805d 100644 --- a/src/core/hle/kernel/svc.cpp +++ b/src/core/hle/kernel/svc.cpp @@ -887,7 +887,7 @@ static Result GetInfo(Core::System& system, u64* result, u64 info_id, Handle han const auto* const current_thread = GetCurrentThreadPointer(system.Kernel()); const bool same_thread = current_thread == thread.GetPointerUnsafe(); - const u64 prev_ctx_ticks = scheduler.GetLastContextSwitchTicks(); + const u64 prev_ctx_ticks = scheduler.GetLastContextSwitchTime(); u64 out_ticks = 0; if (same_thread && info_sub_id == 0xFFFFFFFFFFFFFFFF) { const u64 thread_ticks = current_thread->GetCpuTime(); @@ -3026,11 +3026,6 @@ void Call(Core::System& system, u32 immediate) { } kernel.ExitSVCProfile(); - - if (!thread->IsCallingSvc()) { - auto* host_context = thread->GetHostContext().get(); - host_context->Rewind(); - } } } // namespace Kernel::Svc