Update usage of zeCommandListImmediateAppendCommandListsExp to use dlsym

source/adapters/level_zero/command_buffer.cpp

@@ -26,14 +26,9 @@ namespace {
 // given Context and Device.
 bool checkImmediateAppendSupport(ur_context_handle_t Context,
                                  ur_device_handle_t Device) {
-  // TODO The L0 driver is not reporting this extension yet. Once it does,
-  // switch to using the variable zeDriverImmediateCommandListAppendFound.
 
-  // Minimum version that supports zeCommandListImmediateAppendCommandListsExp.
-  constexpr uint32_t MinDriverVersion = 30898;
   bool DriverSupportsImmediateAppend =
-      Context->getPlatform()->isDriverVersionNewerOrSimilar(1, 3,
-                                                            MinDriverVersion);
+      Context->getPlatform()->ZeCommandListImmediateAppendExt.Supported;
 
   // If this environment variable is:
   //   - Set to 1: the immediate append path will always be enabled as long the
@@ -58,10 +53,8 @@ bool checkImmediateAppendSupport(ur_context_handle_t Context,
     if (EnableAppendPath && !DriverSupportsImmediateAppend) {
       logger::error("{} is set but "
                     "the current driver does not support the "
-                    "zeCommandListImmediateAppendCommandListsExp entrypoint. A "
-                    "driver version of at least {} is required to use the "
-                    "immediate append path.",
-                    AppendEnvVarName, MinDriverVersion);
+                    "zeCommandListImmediateAppendCommandListsExp entrypoint.",
+                    AppendEnvVarName);
       std::abort();
     }
 
@@ -1569,7 +1562,10 @@ ur_result_t enqueueImmediateAppendPath(
     ur_event_handle_t *Event, ur_command_list_ptr_t CommandListHelper,
     bool DoProfiling) {
 
+  ur_platform_handle_t Platform = CommandBuffer->Context->getPlatform();
+
   assert(CommandListHelper->second.IsImmediate);
+  assert(Platform->ZeCommandListImmediateAppendExt.Supported);
 
   _ur_ze_event_list_t UrZeEventList;
   if (NumEventsInWaitList) {
@@ -1587,7 +1583,8 @@ ur_result_t enqueueImmediateAppendPath(
         nullptr /*ForcedCmdQueue*/));
     assert(ZeCopyEngineImmediateListHelper->second.IsImmediate);
 
-    ZE2UR_CALL(zeCommandListImmediateAppendCommandListsExp,
+    ZE2UR_CALL(Platform->ZeCommandListImmediateAppendExt
+                   .zeCommandListImmediateAppendCommandListsExp,
                (ZeCopyEngineImmediateListHelper->first, 1,
                 &CommandBuffer->ZeCopyCommandList, nullptr,
                 UrZeEventList.Length, UrZeEventList.ZeEventList));
@@ -1599,7 +1596,8 @@ ur_result_t enqueueImmediateAppendPath(
   ze_event_handle_t &EventToSignal =
       DoProfiling ? CommandBuffer->ComputeFinishedEvent->ZeEvent
                   : (*Event)->ZeEvent;
-  ZE2UR_CALL(zeCommandListImmediateAppendCommandListsExp,
+  ZE2UR_CALL(Platform->ZeCommandListImmediateAppendExt
+                 .zeCommandListImmediateAppendCommandListsExp,
              (CommandListHelper->first, 1, &CommandBuffer->ZeComputeCommandList,
               EventToSignal, WaitList.Length, WaitList.ZeEventList));
 
@@ -1616,7 +1614,8 @@ ur_result_t enqueueImmediateAppendPath(
                (CommandListHelper->first,
                 CommandBuffer->ExecutionFinishedEvent->ZeEvent, 0, nullptr));
 
-    ZE2UR_CALL(zeCommandListImmediateAppendCommandListsExp,
+    ZE2UR_CALL(Platform->ZeCommandListImmediateAppendExt
+                   .zeCommandListImmediateAppendCommandListsExp,
                (CommandListHelper->first, 1,
                 &CommandBuffer->ZeCommandListResetEvents, nullptr, 0, nullptr));
   }

source/adapters/level_zero/platform.cpp

@@ -224,6 +224,7 @@ ur_result_t ur_platform_handle_t_::initialize() {
 
   bool MutableCommandListSpecExtensionSupported = false;
   bool ZeIntelExternalSemaphoreExtensionSupported = false;
+  bool ZeImmediateCommandListAppendExtensionFound = false;
   for (auto &extension : ZeExtensions) {
     // Check if global offset extension is available
     if (strncmp(extension.name, ZE_GLOBAL_OFFSET_EXP_NAME,
@@ -248,6 +249,14 @@ ur_result_t ur_platform_handle_t_::initialize() {
         ZeDriverEventPoolCountingEventsExtensionFound = true;
       }
     }
+    // Check if the ImmediateAppendCommandLists extension is available.
+    if (strncmp(extension.name, ZE_IMMEDIATE_COMMAND_LIST_APPEND_EXP_NAME,
+                strlen(ZE_IMMEDIATE_COMMAND_LIST_APPEND_EXP_NAME) + 1) == 0) {
+      if (extension.version ==
+          ZE_IMMEDIATE_COMMAND_LIST_APPEND_EXP_VERSION_CURRENT) {
+        ZeImmediateCommandListAppendExtensionFound = true;
+      }
+    }
     // Check if extension is available for Mutable Command List v1.1.
     if (strncmp(extension.name, ZE_MUTABLE_COMMAND_LIST_EXP_NAME,
                 strlen(ZE_MUTABLE_COMMAND_LIST_EXP_NAME) + 1) == 0) {
@@ -427,6 +436,21 @@ ur_result_t ur_platform_handle_t_::initialize() {
                   &ZeMutableCmdListExt
                        .zexCommandListGetNextCommandIdWithKernelsExp))) == 0);
   }
+
+  // Check if ImmediateAppendCommandList is supported and initialize the
+  // function pointer.
+  if (ZeImmediateCommandListAppendExtensionFound) {
+    ZeCommandListImmediateAppendExt
+        .zeCommandListImmediateAppendCommandListsExp =
+        (ze_pfnCommandListImmediateAppendCommandListsExp_t)
+            ur_loader::LibLoader::getFunctionPtr(
+                GlobalAdapter->processHandle,
+                "zeCommandListImmediateAppendCommandListsExp");
+    ZeCommandListImmediateAppendExt.Supported =
+        ZeCommandListImmediateAppendExt
+            .zeCommandListImmediateAppendCommandListsExp != nullptr;
+  }
+
   return UR_RESULT_SUCCESS;
 }
 

source/adapters/level_zero/platform.hpp

@@ -134,4 +134,11 @@ struct ur_platform_handle_t_ : public _ur_platform {
     ze_result_t (*zexDeviceReleaseExternalSemaphoreExp)(
         ze_intel_external_semaphore_exp_handle_t);
   } ZeExternalSemaphoreExt;
-};
+
+  struct ZeCommandListImmediateAppendExtension {
+    bool Supported = false;
+    ze_result_t (*zeCommandListImmediateAppendCommandListsExp)(
+        ze_command_list_handle_t, uint32_t, ze_command_list_handle_t *,
+        ze_event_handle_t, uint32_t, ze_event_handle_t *);
+  } ZeCommandListImmediateAppendExt;
+};