[dxvk] Go back to fence-based command list synchronization

Timeline semaphores are too unreliable on 32-bit Proton builds.

src/dxvk/dxvk_cmdlist.cpp

@@ -39,6 +39,12 @@ namespace dxvk {
   }
 
 
+  void DxvkCommandSubmission::signalFence(
+          VkFence               fence) {
+    m_fence = fence;
+  }
+
+
   void DxvkCommandSubmission::executeCommandBuffer(
           VkCommandBuffer       commandBuffer) {
     VkCommandBufferSubmitInfo submitInfo = { VK_STRUCTURE_TYPE_COMMAND_BUFFER_SUBMIT_INFO };
@@ -73,7 +79,7 @@ namespace dxvk {
     VkResult vr = VK_SUCCESS;
 
     if (!this->isEmpty())
-      vr = vk->vkQueueSubmit2(queue, 1, &submitInfo, VK_NULL_HANDLE);
+      vr = vk->vkQueueSubmit2(queue, 1, &submitInfo, m_fence);
 
     this->reset();
     return vr;
@@ -81,6 +87,7 @@ namespace dxvk {
 
 
   void DxvkCommandSubmission::reset() {
+    m_fence = VK_NULL_HANDLE;
     m_semaphoreWaits.clear();
     m_semaphoreSignals.clear();
     m_commandBuffers.clear();
@@ -88,7 +95,8 @@ namespace dxvk {
 
 
   bool DxvkCommandSubmission::isEmpty() const {
-    return m_semaphoreWaits.empty()
+    return m_fence == VK_NULL_HANDLE
+        && m_semaphoreWaits.empty()
         && m_semaphoreSignals.empty()
         && m_commandBuffers.empty();
   }
@@ -171,6 +179,11 @@ namespace dxvk {
     if (m_vkd->vkCreateSemaphore(m_vkd->device(), &semaphoreInfo, nullptr, &m_sdmaSemaphore))
       throw DxvkError("DxvkCommandList: Failed to create semaphore");
 
+    VkFenceCreateInfo fenceInfo = { VK_STRUCTURE_TYPE_FENCE_CREATE_INFO };
+
+    if (m_vkd->vkCreateFence(m_vkd->device(), &fenceInfo, nullptr, &m_fence))
+      throw DxvkError("DxvkCommandList: Failed to create fence");
+
     m_graphicsPool = new DxvkCommandPool(device, graphicsQueue.queueFamily);
 
     if (transferQueue.queueFamily != graphicsQueue.queueFamily)
@@ -286,6 +299,9 @@ namespace dxvk {
           m_commandSubmission.signalSemaphore(m_wsiSemaphores.present,
             0, VK_PIPELINE_STAGE_2_BOTTOM_OF_PIPE_BIT);
         }
+
+        // Signal synchronization fence on final submission
+        m_commandSubmission.signalFence(m_fence);
       }
 
       // Finally, submit all graphics commands of the current submission
@@ -350,6 +366,11 @@ namespace dxvk {
   }
 
   
+  VkResult DxvkCommandList::synchronizeFence() {
+    return m_vkd->vkWaitForFences(m_vkd->device(), 1, &m_fence, VK_TRUE, ~0ull);
+  }
+
+
   void DxvkCommandList::reset() {
     // Free resources and other objects
     // that are no longer in use
@@ -389,6 +410,10 @@ namespace dxvk {
     // Reset actual command buffers and pools
     m_graphicsPool->reset();
     m_transferPool->reset();
+
+    // Reset fence
+    if (m_vkd->vkResetFences(m_vkd->device(), 1, &m_fence))
+      Logger::err("DxvkCommandList: Failed to reset fence");
   }
 
 

src/dxvk/dxvk_cmdlist.h

@@ -72,6 +72,13 @@ namespace dxvk {
             uint64_t              value,
             VkPipelineStageFlags2 stageMask);
 
+    /**
+     * \brief Adds a fence to signal
+     * \param [in] fence The fence
+     */
+    void signalFence(
+            VkFence               fence);
+
     /**
      * \brief Adds a command buffer to execute
      * \param [in] commandBuffer The command buffer
@@ -105,6 +112,7 @@ namespace dxvk {
 
   private:
 
+    VkFence                                m_fence = VK_NULL_HANDLE;
     std::vector<VkSemaphoreSubmitInfo>     m_semaphoreWaits;
     std::vector<VkSemaphoreSubmitInfo>     m_semaphoreSignals;
     std::vector<VkCommandBufferSubmitInfo> m_commandBuffers;
@@ -359,6 +367,12 @@ namespace dxvk {
       m_wsiSemaphores = wsiSemaphores;
     }
 
+    /**
+     * \brief Synchronizes with command list fence
+     * \returns Return value of vkWaitForFences call
+     */
+    VkResult synchronizeFence();
+
     /**
      * \brief Resets the command list
      * 
@@ -996,6 +1010,7 @@ namespace dxvk {
     Rc<DxvkCommandPool>       m_transferPool;
 
     VkSemaphore               m_sdmaSemaphore = VK_NULL_HANDLE;
+    VkFence                   m_fence         = VK_NULL_HANDLE;
 
     DxvkCommandSubmissionInfo m_cmd;
 

src/dxvk/dxvk_queue.cpp

@@ -32,8 +32,6 @@ namespace dxvk {
     m_submitThread.join();
     m_finishThread.join();
 
-    synchronizeSemaphore(m_semaphoreValue);
-
     vk->vkDestroySemaphore(vk->device(), m_semaphore, nullptr);
   }
   
@@ -95,30 +93,6 @@ namespace dxvk {
   }
 
 
-  VkResult DxvkSubmissionQueue::synchronizeSemaphore(
-          uint64_t        semaphoreValue) {
-    auto vk = m_device->vkd();
-
-    VkSemaphoreWaitInfo waitInfo = { VK_STRUCTURE_TYPE_SEMAPHORE_WAIT_INFO };
-    waitInfo.semaphoreCount = 1;
-    waitInfo.pSemaphores = &m_semaphore;
-    waitInfo.pValues = &semaphoreValue;
-
-    // 32-bit winevulkan on Proton seems to be broken here
-    // and returns with VK_TIMEOUT, even though the timeout
-    // is infinite. Work around this by spinning.
-    VkResult vr = VK_TIMEOUT;
-
-    while (vr == VK_TIMEOUT)
-      vr = vk->vkWaitSemaphores(vk->device(), &waitInfo, ~0ull);
-
-    if (vr)
-      Logger::err(str::format("Failed to synchronize with global timeline semaphore: ", vr));
-
-    return vr;
-  }
-
-
   void DxvkSubmissionQueue::submitCmdLists() {
     env::setThreadName("dxvk-submit");
 
@@ -141,12 +115,10 @@ namespace dxvk {
       if (m_lastError != VK_ERROR_DEVICE_LOST) {
         std::lock_guard<dxvk::mutex> lock(m_mutexQueue);
 
-        if (entry.submit.cmdList != nullptr) {
+        if (entry.submit.cmdList != nullptr)
           status = entry.submit.cmdList->submit(m_semaphore, m_semaphoreValue);
-          entry.submit.semaphoreValue = m_semaphoreValue;
-        } else if (entry.present.presenter != nullptr) {
+        else if (entry.present.presenter != nullptr)
           status = entry.present.presenter->presentImage();
-        }
       } else {
         // Don't submit anything after device loss
         // so that drivers get a chance to recover
@@ -200,7 +172,7 @@ namespace dxvk {
       VkResult status = m_lastError.load();
       
       if (status != VK_ERROR_DEVICE_LOST)
-        status = synchronizeSemaphore(entry.submit.semaphoreValue);
+        status = entry.submit.cmdList->synchronizeFence();
       
       if (status != VK_SUCCESS) {
         m_lastError = status;

src/dxvk/dxvk_queue.h

@@ -33,7 +33,6 @@ namespace dxvk {
    */
   struct DxvkSubmitInfo {
     Rc<DxvkCommandList> cmdList;
-    uint64_t semaphoreValue;
   };
   
   
@@ -200,9 +199,6 @@ namespace dxvk {
     dxvk::thread                m_submitThread;
     dxvk::thread                m_finishThread;
 
-    VkResult synchronizeSemaphore(
-            uint64_t        semaphoreValue);
-
     void submitCmdLists();
 
     void finishCmdLists();