Adjust gpfifo WFI to only do a pipeline barrier

app/src/main/cpp/skyline/gpu/interconnect/command_executor.cpp

@@ -443,6 +443,17 @@ namespace skyline::gpu::interconnect {
         slot->nodes.emplace_back(std::in_place_type_t<node::FunctionNode>(), std::forward<decltype(function)>(function));
     }
 
+    void CommandExecutor::AddFullBarrier() {
+        AddOutsideRpCommand([](vk::raii::CommandBuffer &commandBuffer, const std::shared_ptr<FenceCycle> &, GPU &) {
+            commandBuffer.pipelineBarrier(
+                vk::PipelineStageFlagBits::eAllCommands, vk::PipelineStageFlagBits::eAllCommands, {}, vk::MemoryBarrier{
+                    .srcAccessMask = vk::AccessFlagBits::eMemoryRead | vk::AccessFlagBits::eMemoryWrite,
+                    .dstAccessMask = vk::AccessFlagBits::eMemoryRead | vk::AccessFlagBits::eMemoryWrite,
+                }, {}, {}
+            );
+        });
+    }
+
     void CommandExecutor::AddClearColorSubpass(TextureView *attachment, const vk::ClearColorValue &value) {
         bool gotoNext{CreateRenderPassWithSubpass(vk::Rect2D{.extent = attachment->texture->dimensions}, {}, {}, attachment, nullptr)};
         if (renderPass->ClearColorAttachment(0, value, gpu)) {

app/src/main/cpp/skyline/gpu/interconnect/command_executor.h

@@ -284,6 +284,11 @@ namespace skyline::gpu::interconnect {
          */
         void AddOutsideRpCommand(std::function<void(vk::raii::CommandBuffer &, const std::shared_ptr<FenceCycle> &, GPU &)> &&function);
 
+        /**
+         * @brief Adds a full pipeline barrier to the command buffer
+         */
+        void AddFullBarrier();
+
         /**
          * @brief Adds a persistent callback that will be called at the start of Execute in order to flush data required for recording
          */

app/src/main/cpp/skyline/soc/gm20b/engines/gpfifo.cpp

@@ -118,7 +118,7 @@ namespace skyline::soc::gm20b::engine {
                 }
             })
             ENGINE_CASE(wfi, {
-                channelCtx.executor.Submit();
+                channelCtx.executor.AddFullBarrier();
             })
             ENGINE_CASE(setReference, {
                 channelCtx.executor.Submit();