From af42482565daf646d89a0a3cd8001a527ab76621 Mon Sep 17 00:00:00 2001
From: Liam <byteslice@airmail.cc>
Date: Wed, 14 Feb 2024 16:57:20 -0500
Subject: kernel: add and enable system suspend type

---
 src/core/core.cpp              | 10 ++++----
 src/core/hle/kernel/k_thread.h |  4 ++-
 src/core/hle/kernel/kernel.cpp | 57 ++++++++++++++++++++++++------------------
 src/core/hle/kernel/kernel.h   |  4 +--
 4 files changed, 43 insertions(+), 32 deletions(-)

diff --git a/src/core/core.cpp b/src/core/core.cpp
index 435ef6793..bd5f11d53 100644
--- a/src/core/core.cpp
+++ b/src/core/core.cpp
@@ -242,7 +242,7 @@ struct System::Impl {
     void Run() {
         std::unique_lock<std::mutex> lk(suspend_guard);
 
-        kernel.SuspendApplication(false);
+        kernel.SuspendEmulation(false);
         core_timing.SyncPause(false);
         is_paused.store(false, std::memory_order_relaxed);
     }
@@ -251,7 +251,7 @@ struct System::Impl {
         std::unique_lock<std::mutex> lk(suspend_guard);
 
         core_timing.SyncPause(true);
-        kernel.SuspendApplication(true);
+        kernel.SuspendEmulation(true);
         is_paused.store(true, std::memory_order_relaxed);
     }
 
@@ -261,7 +261,7 @@ struct System::Impl {
 
     std::unique_lock<std::mutex> StallApplication() {
         std::unique_lock<std::mutex> lk(suspend_guard);
-        kernel.SuspendApplication(true);
+        kernel.SuspendEmulation(true);
         core_timing.SyncPause(true);
         return lk;
     }
@@ -269,7 +269,7 @@ struct System::Impl {
     void UnstallApplication() {
         if (!IsPaused()) {
             core_timing.SyncPause(false);
-            kernel.SuspendApplication(false);
+            kernel.SuspendEmulation(false);
         }
     }
 
@@ -459,7 +459,7 @@ struct System::Impl {
         }
 
         Network::CancelPendingSocketOperations();
-        kernel.SuspendApplication(true);
+        kernel.SuspendEmulation(true);
         if (services) {
             services->KillNVNFlinger();
         }
diff --git a/src/core/hle/kernel/k_thread.h b/src/core/hle/kernel/k_thread.h
index f13e232b2..e928cfebc 100644
--- a/src/core/hle/kernel/k_thread.h
+++ b/src/core/hle/kernel/k_thread.h
@@ -66,6 +66,7 @@ enum class SuspendType : u32 {
     Debug = 2,
     Backtrace = 3,
     Init = 4,
+    System = 5,
 
     Count,
 };
@@ -84,8 +85,9 @@ enum class ThreadState : u16 {
     DebugSuspended = (1 << (2 + SuspendShift)),
     BacktraceSuspended = (1 << (3 + SuspendShift)),
     InitSuspended = (1 << (4 + SuspendShift)),
+    SystemSuspended = (1 << (5 + SuspendShift)),
 
-    SuspendFlagMask = ((1 << 5) - 1) << SuspendShift,
+    SuspendFlagMask = ((1 << 6) - 1) << SuspendShift,
 };
 DECLARE_ENUM_FLAG_OPERATORS(ThreadState);
 
diff --git a/src/core/hle/kernel/kernel.cpp b/src/core/hle/kernel/kernel.cpp
index 34b25be66..4f4b02fac 100644
--- a/src/core/hle/kernel/kernel.cpp
+++ b/src/core/hle/kernel/kernel.cpp
@@ -1204,39 +1204,48 @@ const Kernel::KSharedMemory& KernelCore::GetHidBusSharedMem() const {
     return *impl->hidbus_shared_mem;
 }
 
-void KernelCore::SuspendApplication(bool suspended) {
+void KernelCore::SuspendEmulation(bool suspended) {
     const bool should_suspend{exception_exited || suspended};
-    const auto activity =
-        should_suspend ? Svc::ProcessActivity::Paused : Svc::ProcessActivity::Runnable;
+    auto processes = GetProcessList();
 
-    // Get the application process.
-    KScopedAutoObject<KProcess> process = ApplicationProcess();
-    if (process.IsNull()) {
-        return;
+    for (auto& process : processes) {
+        KScopedLightLock ll{process->GetListLock()};
+
+        for (auto& thread : process->GetThreadList()) {
+            if (should_suspend) {
+                thread.RequestSuspend(SuspendType::System);
+            } else {
+                thread.Resume(SuspendType::System);
+            }
+        }
     }
 
-    // Set the new activity.
-    process->SetActivity(activity);
+    if (!should_suspend) {
+        return;
+    }
 
     // Wait for process execution to stop.
-    bool must_wait{should_suspend};
-
-    // KernelCore::SuspendApplication must be called from locked context,
-    // or we could race another call to SetActivity, interfering with waiting.
-    while (must_wait) {
+    // KernelCore::SuspendEmulation must be called from locked context,
+    // or we could race another call, interfering with waiting.
+    const auto TryWait = [&]() {
         KScopedSchedulerLock sl{*this};
 
-        // Assume that all threads have finished running.
-        must_wait = false;
-
-        for (auto i = 0; i < static_cast<s32>(Core::Hardware::NUM_CPU_CORES); ++i) {
-            if (Scheduler(i).GetSchedulerCurrentThread()->GetOwnerProcess() ==
-                process.GetPointerUnsafe()) {
-                // A thread has not finished running yet.
-                // Continue waiting.
-                must_wait = true;
+        for (auto& process : processes) {
+            for (auto i = 0; i < static_cast<s32>(Core::Hardware::NUM_CPU_CORES); ++i) {
+                if (Scheduler(i).GetSchedulerCurrentThread()->GetOwnerProcess() ==
+                    process.GetPointerUnsafe()) {
+                    // A thread has not finished running yet.
+                    // Continue waiting.
+                    return false;
+                }
             }
         }
+
+        return true;
+    };
+
+    while (!TryWait()) {
+        // ...
     }
 }
 
@@ -1260,7 +1269,7 @@ bool KernelCore::IsShuttingDown() const {
 
 void KernelCore::ExceptionalExitApplication() {
     exception_exited = true;
-    SuspendApplication(true);
+    SuspendEmulation(true);
 }
 
 void KernelCore::EnterSVCProfile() {
diff --git a/src/core/hle/kernel/kernel.h b/src/core/hle/kernel/kernel.h
index 8ea5bed1c..57182c0c8 100644
--- a/src/core/hle/kernel/kernel.h
+++ b/src/core/hle/kernel/kernel.h
@@ -258,8 +258,8 @@ public:
     /// Gets the shared memory object for HIDBus services.
     const Kernel::KSharedMemory& GetHidBusSharedMem() const;
 
-    /// Suspend/unsuspend application process.
-    void SuspendApplication(bool suspend);
+    /// Suspend/unsuspend emulated processes.
+    void SuspendEmulation(bool suspend);
 
     /// Exceptional exit application process.
     void ExceptionalExitApplication();
-- 
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