NvHost: Try a different approach to blocking.

src/core/hle/service/nvdrv/devices/nvhost_ctrl.cpp

@@ -91,7 +91,7 @@ NvResult nvhost_ctrl::IocCtrlEventWait(const std::vector<u8>& input, std::vector
     if (syncpoint_manager.IsSyncpointExpired(params.syncpt_id, params.threshold)) {
         params.value = syncpoint_manager.GetSyncpointMin(params.syncpt_id);
         std::memcpy(output.data(), &params, sizeof(params));
-        events_interface.failed[event_id] = false;
+        events_interface.fails[event_id] = 0;
         return NvResult::Success;
     }
 
@@ -99,29 +99,26 @@ NvResult nvhost_ctrl::IocCtrlEventWait(const std::vector<u8>& input, std::vector
         syncpoint_manager.IsSyncpointExpired(params.syncpt_id, params.threshold)) {
         params.value = new_value;
         std::memcpy(output.data(), &params, sizeof(params));
-        events_interface.failed[event_id] = false;
+        events_interface.fails[event_id] = 0;
         return NvResult::Success;
     }
 
-    auto& event = events_interface.events[event_id];
     auto& gpu = system.GPU();
-    const u32 current_syncpoint_value = event.fence.value;
-    const s32 diff = current_syncpoint_value - params.threshold;
-    const u32 target_value = params.value;
+    const u32 target_value = syncpoint_manager.GetSyncpointMax(params.syncpt_id);
 
     if (!is_async) {
         params.value = 0;
     }
 
     const auto check_failing = [&]() {
-        if (events_interface.failed[event_id]) {
+        if (events_interface.fails[event_id] > 1) {
             {
                 auto lk = system.StallProcesses();
                 gpu.WaitFence(params.syncpt_id, target_value);
                 system.UnstallProcesses();
             }
             std::memcpy(output.data(), &params, sizeof(params));
-            events_interface.failed[event_id] = false;
+            events_interface.fails[event_id] = 0;
             return true;
         }
         return false;
@@ -207,7 +204,7 @@ NvResult nvhost_ctrl::IocCtrlClearEventWait(const std::vector<u8>& input, std::v
     if (events_interface.status[event_id] == EventState::Waiting) {
         events_interface.LiberateEvent(event_id);
     }
-    events_interface.failed[event_id] = true;
+    events_interface.fails[event_id]++;
 
     syncpoint_manager.RefreshSyncpoint(events_interface.events[event_id].fence.id);
 

src/core/hle/service/nvdrv/nvdrv.h

@@ -50,7 +50,7 @@ struct EventInterface {
     // Tells if an NVEvent is registered or not
     std::array<bool, MaxNvEvents> registered{};
     // Tells the NVEvent that it has failed.
-    std::array<bool, MaxNvEvents> failed{};
+    std::array<u32, MaxNvEvents> fails{};
     // When an NVEvent is waiting on GPU interrupt, this is the sync_point
     // associated with it.
     std::array<u32, MaxNvEvents> assigned_syncpt{};