Use config changed callback to detect SD insertion/ejection

This saves the GUI from having to manually call SDIO_EventNotify.
With that out of the way, we can let users change the
"Insert SD Card" setting on Android while a game is running.

Source/Android/app/src/main/java/org/dolphinemu/dolphinemu/features/settings/model/BooleanSetting.java

@@ -228,7 +228,6 @@ public enum BooleanSetting implements AbstractBooleanSetting
           MAIN_CPU_THREAD,
           MAIN_ENABLE_CHEATS,
           MAIN_OVERRIDE_REGION_SETTINGS,
-          MAIN_WII_SD_CARD,  // Can actually be changed, but specialized code is required
           MAIN_MMU,
           MAIN_DSP_JIT,
   };

Source/Core/Core/IOS/IOS.cpp

@@ -63,7 +63,6 @@ static std::unique_ptr<EmulationKernel> s_ios;
 
 constexpr u64 ENQUEUE_REQUEST_FLAG = 0x100000000ULL;
 static CoreTiming::EventType* s_event_enqueue;
-static CoreTiming::EventType* s_event_sdio_notify;
 static CoreTiming::EventType* s_event_finish_ppc_bootstrap;
 static CoreTiming::EventType* s_event_finish_ios_boot;
 
@@ -789,14 +788,6 @@ void Kernel::UpdateWantDeterminism(const bool new_want_determinism)
     device.second->UpdateWantDeterminism(new_want_determinism);
 }
 
-void Kernel::SDIO_EventNotify()
-{
-  // TODO: Potential race condition: If IsRunning() becomes false after
-  // it's checked, an event may be scheduled after CoreTiming shuts down.
-  if (SConfig::GetInstance().bWii && Core::IsRunning())
-    CoreTiming::ScheduleEvent(0, s_event_sdio_notify, 0, CoreTiming::FromThread::NON_CPU);
-}
-
 void Kernel::DoState(PointerWrap& p)
 {
   p.Do(m_request_queue);
@@ -886,16 +877,6 @@ void Init()
       s_ios->HandleIPCEvent(userdata);
   });
 
-  s_event_sdio_notify = CoreTiming::RegisterEvent("SDIO_EventNotify", [](u64, s64) {
-    if (!s_ios)
-      return;
-
-    auto sdio_slot0 = s_ios->GetDeviceByName("/dev/sdio/slot0");
-    auto device = static_cast<SDIOSlot0Device*>(sdio_slot0.get());
-    if (device)
-      device->EventNotify();
-  });
-
   ESDevice::InitializeEmulationState();
 
   s_event_finish_ppc_bootstrap =

Source/Core/Core/IOS/IOS.h

@@ -125,8 +125,6 @@ public:
   std::shared_ptr<FSDevice> GetFSDevice();
   std::shared_ptr<ESDevice> GetES();
 
-  void SDIO_EventNotify();
-
   void EnqueueIPCRequest(u32 address);
   void EnqueueIPCReply(const Request& request, s32 return_value, s64 cycles_in_future = 0,
                        CoreTiming::FromThread from = CoreTiming::FromThread::CPU);

Source/Core/Core/IOS/SDIO/SDIOSlot0.cpp

@@ -14,8 +14,10 @@
 #include "Common/IOFile.h"
 #include "Common/Logging/Log.h"
 #include "Common/SDCardUtil.h"
+
 #include "Core/Config/MainSettings.h"
 #include "Core/Config/SessionSettings.h"
+#include "Core/Core.h"
 #include "Core/HW/Memmap.h"
 #include "Core/IOS/IOS.h"
 #include "Core/IOS/VersionInfo.h"
@@ -27,6 +29,29 @@ SDIOSlot0Device::SDIOSlot0Device(Kernel& ios, const std::string& device_name)
 {
   if (!Config::Get(Config::MAIN_ALLOW_SD_WRITES))
     INFO_LOG_FMT(IOS_SD, "Writes to SD card disabled by user");
+
+  m_config_callback_id = Config::AddConfigChangedCallback([this] { RefreshConfig(); });
+  m_sd_card_inserted = Config::Get(Config::MAIN_WII_SD_CARD);
+}
+
+SDIOSlot0Device::~SDIOSlot0Device()
+{
+  Config::RemoveConfigChangedCallback(m_config_callback_id);
+}
+
+void SDIOSlot0Device::RefreshConfig()
+{
+  if (m_sd_card_inserted != Config::Get(Config::MAIN_WII_SD_CARD))
+  {
+    Core::RunAsCPUThread([this] {
+      const bool sd_card_inserted = Config::Get(Config::MAIN_WII_SD_CARD);
+      if (m_sd_card_inserted != sd_card_inserted)
+      {
+        m_sd_card_inserted = sd_card_inserted;
+        EventNotify();
+      }
+    });
+  }
 }
 
 void SDIOSlot0Device::DoState(PointerWrap& p)
@@ -49,10 +74,14 @@ void SDIOSlot0Device::EventNotify()
   if (!m_event)
     return;
 
-  const bool sd_card_inserted = Config::Get(Config::MAIN_WII_SD_CARD);
-  if ((sd_card_inserted && m_event->type == EVENT_INSERT) ||
-      (!sd_card_inserted && m_event->type == EVENT_REMOVE))
+  if ((m_sd_card_inserted && m_event->type == EVENT_INSERT) ||
+      (!m_sd_card_inserted && m_event->type == EVENT_REMOVE))
   {
+    if (m_sd_card_inserted)
+      INFO_LOG_FMT(IOS_SD, "Notifying PPC of SD card insertion");
+    else
+      INFO_LOG_FMT(IOS_SD, "Notifying PPC of SD card removal");
+
     m_ios.EnqueueIPCReply(m_event->request, m_event->type);
     m_event.reset();
   }

Source/Core/Core/IOS/SDIO/SDIOSlot0.h

@@ -22,6 +22,7 @@ class SDIOSlot0Device : public Device
 {
 public:
   SDIOSlot0Device(Kernel& ios, const std::string& device_name);
+  ~SDIOSlot0Device() override;
 
   void DoState(PointerWrap& p) override;
 
@@ -30,8 +31,6 @@ public:
   std::optional<IPCReply> IOCtl(const IOCtlRequest& request) override;
   std::optional<IPCReply> IOCtlV(const IOCtlVRequest& request) override;
 
-  void EventNotify();
-
 private:
   // SD Host Controller Registers
   enum
@@ -124,6 +123,10 @@ private:
     Request request;
   };
 
+  void RefreshConfig();
+
+  void EventNotify();
+
   IPCReply WriteHCRegister(const IOCtlRequest& request);
   IPCReply ReadHCRegister(const IOCtlRequest& request);
   IPCReply ResetCard(const IOCtlRequest& request);
@@ -162,5 +165,8 @@ private:
   std::array<u32, 0x200 / sizeof(u32)> m_registers{};
 
   File::IOFile m_card;
+
+  size_t m_config_callback_id;
+  bool m_sd_card_inserted = false;
 };
 }  // namespace IOS::HLE

Source/Core/DolphinQt/Settings.cpp

@@ -705,10 +705,6 @@ void Settings::SetSDCardInserted(bool inserted)
   {
     Config::SetBaseOrCurrent(Config::MAIN_WII_SD_CARD, inserted);
     emit SDCardInsertionChanged(inserted);
-
-    auto* ios = IOS::HLE::GetIOS();
-    if (ios)
-      ios->SDIO_EventNotify();
   }
 }