3 files changed, 31 insertions, 5 deletions

diff --git a/src/video_core/renderer_vulkan/vk_pipeline_cache.cpp b/src/video_core/renderer_vulkan/vk_pipeline_cache.cpp
index 22bf8cc77..16ad8d625 100644
--- a/src/video_core/renderer_vulkan/vk_pipeline_cache.cpp
+++ b/src/video_core/renderer_vulkan/vk_pipeline_cache.cpp
@@ -263,6 +263,22 @@ Shader::RuntimeInfo MakeRuntimeInfo(std::span<const Shader::IR::Program> program
     info.y_negate = key.state.y_negate != 0;
     return info;
 }
+
+size_t GetTotalPipelineWorkers() {
+    const size_t max_core_threads =
+        std::max<size_t>(static_cast<size_t>(std::thread::hardware_concurrency()), 2ULL) - 1ULL;
+#ifdef ANDROID
+    // Leave at least a few cores free in android
+    constexpr size_t free_cores = 3ULL;
+    if (max_core_threads <= free_cores) {
+        return 1ULL;
+    }
+    return max_core_threads - free_cores;
+#else
+    return max_core_threads;
+#endif
+}
+
 } // Anonymous namespace
 
 size_t ComputePipelineCacheKey::Hash() const noexcept {
@@ -294,11 +310,8 @@ PipelineCache::PipelineCache(RasterizerVulkan& rasterizer_, const Device& device
       texture_cache{texture_cache_}, shader_notify{shader_notify_},
       use_asynchronous_shaders{Settings::values.use_asynchronous_shaders.GetValue()},
       use_vulkan_pipeline_cache{Settings::values.use_vulkan_driver_pipeline_cache.GetValue()},
-#ifdef ANDROID
-      workers(1, "VkPipelineBuilder"),
-#else
-      workers(std::max(std::thread::hardware_concurrency(), 2U) - 1, "VkPipelineBuilder"),
-#endif
+      workers(device.HasBrokenParallelShaderCompiling() ? 1ULL : GetTotalPipelineWorkers(),
+              "VkPipelineBuilder"),
       serialization_thread(1, "VkPipelineSerialization") {
     const auto& float_control{device.FloatControlProperties()};
     const VkDriverId driver_id{device.GetDriverID()};
diff --git a/src/video_core/vulkan_common/vulkan_device.cpp b/src/video_core/vulkan_common/vulkan_device.cpp
index e518756d2..6900b8ffa 100644
--- a/src/video_core/vulkan_common/vulkan_device.cpp
+++ b/src/video_core/vulkan_common/vulkan_device.cpp
@@ -635,6 +635,12 @@ Device::Device(VkInstance instance_, vk::PhysicalDevice physical_, VkSurfaceKHR
             has_broken_cube_compatibility = true;
         }
     }
+    if (is_qualcomm) {
+        const u32 version = (properties.properties.driverVersion << 3) >> 3;
+        if (version < VK_MAKE_API_VERSION(0, 255, 615, 512)) {
+            has_broken_parallel_compiling = true;
+        }
+    }
     if (extensions.sampler_filter_minmax && is_amd) {
         // Disable ext_sampler_filter_minmax on AMD GCN4 and lower as it is broken.
         if (!features.shader_float16_int8.shaderFloat16) {
diff --git a/src/video_core/vulkan_common/vulkan_device.h b/src/video_core/vulkan_common/vulkan_device.h
index b213ed7dd..355de0616 100644
--- a/src/video_core/vulkan_common/vulkan_device.h
+++ b/src/video_core/vulkan_common/vulkan_device.h
@@ -102,6 +102,7 @@ VK_DEFINE_HANDLE(VmaAllocator)
     EXTENSION_NAME(VK_EXT_EXTENDED_DYNAMIC_STATE_EXTENSION_NAME)                                   \
     EXTENSION_NAME(VK_EXT_EXTENDED_DYNAMIC_STATE_2_EXTENSION_NAME)                                 \
     EXTENSION_NAME(VK_EXT_EXTENDED_DYNAMIC_STATE_3_EXTENSION_NAME)                                 \
+    EXTENSION_NAME(VK_EXT_EXTERNAL_MEMORY_HOST_EXTENSION_NAME)                                     \
     EXTENSION_NAME(VK_EXT_4444_FORMATS_EXTENSION_NAME)                                             \
     EXTENSION_NAME(VK_EXT_LINE_RASTERIZATION_EXTENSION_NAME)                                       \
     EXTENSION_NAME(VK_EXT_ROBUSTNESS_2_EXTENSION_NAME)                                             \
@@ -599,6 +600,11 @@ public:
         return has_broken_cube_compatibility;
     }
 
+    /// Returns true if parallel shader compiling has issues with the current driver.
+    bool HasBrokenParallelShaderCompiling() const {
+        return has_broken_parallel_compiling;
+    }
+
     /// Returns the vendor name reported from Vulkan.
     std::string_view GetVendorName() const {
         return properties.driver.driverName;
@@ -794,6 +800,7 @@ private:
     bool is_non_gpu{};                         ///< Is SoftwareRasterizer, FPGA, non-GPU device.
     bool has_broken_compute{};                 ///< Compute shaders can cause crashes
     bool has_broken_cube_compatibility{};      ///< Has broken cube compatibility bit
+    bool has_broken_parallel_compiling{};      ///< Has broken parallel shader compiling.
     bool has_renderdoc{};                      ///< Has RenderDoc attached
     bool has_nsight_graphics{};                ///< Has Nsight Graphics attached
     bool supports_d24_depth{};                 ///< Supports D24 depth buffers.