Some fixes (and async testing (doesn't work))

src/video_core/buffer_cache/buffer_cache.cpp

@@ -553,7 +553,6 @@ void BufferCache::CreateFaultBuffers() {
         .offset = 0,
         .size = FAULT_READBACK_SIZE,
     };
-    staging_buffer.Commit();
     scheduler.EndRendering();
     const auto cmdbuf = scheduler.CommandBuffer();
     cmdbuf.pipelineBarrier2(vk::DependencyInfo{
@@ -562,35 +561,39 @@ void BufferCache::CreateFaultBuffers() {
         .pBufferMemoryBarriers = &barrier,
     });
     cmdbuf.copyBuffer(fault_readback_buffer.buffer, staging_buffer.Handle(), copy);
-    scheduler.Finish();
-    std::memcpy(fault_readback_cpu.data(), mapped, FAULT_READBACK_SIZE);
-    // Create the fault buffers batched
-    boost::icl::interval_set<VAddr> fault_ranges;
-    for (u64 i = 0; i < FAULT_READBACK_SIZE; ++i) {
-        if (fault_readback_cpu[i] == 0) {
-            continue;
-        }
-        // Each bit is a page
-        const u64 page = i * 8;
-        for (u8 j = 0; j < 8; ++j) {
-            if ((fault_readback_cpu[i] & (1 << j)) == 0) {
+    staging_buffer.Commit();
+    scheduler.DeferOperation([this, mapped]() {
+        std::memcpy(fault_readback_cpu.data(), mapped, FAULT_READBACK_SIZE);
+        // Create the fault buffers batched
+        boost::icl::interval_set<VAddr> fault_ranges;
+        for (u64 i = 0; i < FAULT_READBACK_SIZE; ++i) {
+            if (fault_readback_cpu[i] == 0) {
                 continue;
             }
-            const VAddr start = (page + j) << CACHING_PAGEBITS;
-            const VAddr end = start + CACHING_PAGESIZE;
-            fault_ranges += boost::icl::interval_set<VAddr>::interval_type::right_open(start, end);
-            LOG_WARNING(Render_Vulkan, "Accessed non GPU-local memory at {:#x}", start);
+            // Each bit is a page
+            const u64 page = i * 8;
+            for (u8 j = 0; j < 8; ++j) {
+                if ((fault_readback_cpu[i] & (1 << j)) == 0) {
+                    continue;
+                }
+                const VAddr start = (page + j) << CACHING_PAGEBITS;
+                const VAddr end = start + CACHING_PAGESIZE;
+                fault_ranges +=
+                    boost::icl::interval_set<VAddr>::interval_type::right_open(start, end);
+                 LOG_WARNING(Render_Vulkan, "Accessed non GPU-local memory at {:#x}", start);
+            }
         }
-    }
-    for (const auto& range : fault_ranges) {
-        const VAddr start = range.lower();
-        const u64 size = range.upper() - start;
-        // Buffer size is 32 bits
-        for (VAddr addr = start; addr < size; addr += std::numeric_limits<u32>::max()) {
-            const u32 size_buffer = std::min<u32>(size, std::numeric_limits<u32>::max());
-            CreateBuffer(addr, size_buffer);
+        for (const auto& range : fault_ranges) {
+            const VAddr start = range.lower();
+            const VAddr end = range.upper();
+            // Buffer size is 32 bits
+            for (VAddr addr = start; addr < end; addr += std::numeric_limits<u32>::max()) {
+                const u32 size_buffer = std::min<u32>(end - addr, std::numeric_limits<u32>::max());
+                CreateBuffer(addr, size_buffer);
+            }
         }
-    }
+    });
+    scheduler.Flush();
 }
 
 void BufferCache::ResetFaultReadbackBuffer() {

src/video_core/renderer_vulkan/vk_scheduler.cpp

@@ -70,6 +70,11 @@ void Scheduler::Flush(SubmitInfo& info) {
     SubmitExecution(info);
 }
 
+void Scheduler::Flush() {
+    SubmitInfo info{};
+    Flush(info);
+}
+
 void Scheduler::Finish() {
     // When finishing, we need to wait for the submission to have executed on the device.
     const u64 presubmit_tick = CurrentTick();
@@ -85,6 +90,12 @@ void Scheduler::Wait(u64 tick) {
         Flush(info);
     }
     master_semaphore.Wait(tick);
+
+    // Only apply pending operations until the current tick.
+    while (!pending_ops.empty() && pending_ops.front().gpu_tick <= tick) {
+        pending_ops.front().callback();
+        pending_ops.pop();
+    }
 }
 
 void Scheduler::AllocateWorkerCommandBuffers() {

src/video_core/renderer_vulkan/vk_scheduler.h

@@ -307,6 +307,10 @@ public:
     /// and increments the scheduler timeline semaphore.
     void Flush(SubmitInfo& info);
 
+    /// Sends the current execution context to the GPU
+    /// and increments the scheduler timeline semaphore.
+    void Flush();
+
     /// Sends the current execution context to the GPU and waits for it to complete.
     void Finish();