[dxvk] Add option to disable workaround for NVIDIA HVV bug

Adds a new dxvk.halveNvidiaHVVHeap option.

Reviewed-by: Arthur Huillet <ahuillet@nvidia.com>

dxvk.conf

@@ -206,6 +206,20 @@
 # dxvk.useEarlyDiscard = Auto
 
 
+# Controls workaround for NVIDIA HVV Heap bug.
+#
+# Limits the budget of NVIDIA's HVV (host-visible,
+# device-local) heap to be half of the reported size. This is
+# needed to avoid NVIDIA driver bug 3114283, and defaults to
+# being enabled on all affected drivers.
+#
+# Supported values:
+# - Auto: Don't change the default
+# - True, False: Always enable / disable
+
+# dxvk.halveNvidiaHVVHeap = Auto
+
+
 # Sets enabled HUD elements
 # 
 # Behaves like the DXVK_HUD environment variable if the

src/dxvk/dxvk_memory.cpp

@@ -180,7 +180,11 @@ namespace dxvk {
     /* Work around an issue on Nvidia drivers where using the entire
      * device_local | host_visible heap can cause crashes, presumably
      * due to subsequent internal driver allocations failing */
-    if (m_device->properties().core.properties.vendorID == uint16_t(DxvkGpuVendor::Nvidia)) {
+    bool nvidiaBug3114283Active = true;
+    applyTristate(nvidiaBug3114283Active, device->config().halveNvidiaHVVHeap);
+
+    if ((m_device->properties().core.properties.vendorID == uint16_t(DxvkGpuVendor::Nvidia))
+     && (nvidiaBug3114283Active)) {
       for (uint32_t i = 0; i < m_memProps.memoryTypeCount; i++) {
         constexpr VkMemoryPropertyFlags flags = VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT | VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT;
 
@@ -432,4 +436,4 @@ namespace dxvk {
     return chunkSize;
   }
   
-}
+}

src/dxvk/dxvk_options.cpp

@@ -9,7 +9,8 @@ namespace dxvk {
     numCompilerThreads    = config.getOption<int32_t> ("dxvk.numCompilerThreads",     0);
     useRawSsbo            = config.getOption<Tristate>("dxvk.useRawSsbo",             Tristate::Auto);
     useEarlyDiscard       = config.getOption<Tristate>("dxvk.useEarlyDiscard",        Tristate::Auto);
+    halveNvidiaHVVHeap    = config.getOption<Tristate>("dxvk.halveNvidiaHVVHeap",     Tristate::Auto);
     hud                   = config.getOption<std::string>("dxvk.hud", "");
   }
 
-}
+}

src/dxvk/dxvk_options.h

@@ -25,8 +25,14 @@ namespace dxvk {
     Tristate useRawSsbo;
     Tristate useEarlyDiscard;
 
+    /// Workaround for NVIDIA driver
+    /// bug 3114283. Cut usable HVV
+    /// (Host-Visible Vidmem) heap
+    /// in half to avoid crash
+    Tristate halveNvidiaHVVHeap;
+
     /// HUD elements
     std::string hud;
   };
 
-}
+}