[L0] Add support for in-order lists using L0 driver

Signed-off-by: Raiyan Latif <raiyan.latif@intel.com>

source/adapters/level_zero/device.cpp

@@ -1029,6 +1029,19 @@ bool ur_device_handle_t_::useRelaxedAllocationLimits() {
  return EnableRelaxedAllocationLimits;
 }
 
+bool ur_device_handle_t_::useDriverInOrderLists() {
+ // Use in-order lists implementation from L0 driver instead
+ // of adapter's implementation.
+ static const bool UseDriverInOrderLists = [] {
+ const char *UrRet = std::getenv("UR_L0_USE_DRIVER_INORDER_LISTS");
+ if (!UrRet)
+ return false;
+ return std::atoi(UrRet) != 0;
+ }();
+
+ return UseDriverInOrderLists;
+}
+
 ur_result_t ur_device_handle_t_::initialize(int SubSubDeviceOrdinal,
  int SubSubDeviceIndex) {
  // Maintain various device properties cache.

source/adapters/level_zero/device.hpp

@@ -143,6 +143,9 @@ struct ur_device_handle_t_ : _ur_object {
  // Read env settings to select immediate commandlist mode.
  ImmCmdlistMode useImmediateCommandLists();
 
+ // Whether Adapter uses driver's implementation of in-order lists or not
+ bool useDriverInOrderLists();
+
  // Returns whether immediate command lists are used on this device.
  ImmCmdlistMode ImmCommandListUsed{};
 

source/adapters/level_zero/kernel.cpp

@@ -191,9 +191,28 @@ UR_APIEXPORT ur_result_t UR_APICALL urEnqueueKernelLaunch(
  ZE2UR_CALL(zeKernelSetGroupSize, (ZeKernel, WG[0], WG[1], WG[2]));
 
  bool UseCopyEngine = false;
+
+ bool UseTmpWaitList = false;
+ if (Queue->Device->useDriverInOrderLists() && Queue->isInOrderQueue()) {
+ for (uint32_t i = 0; i < NumEventsInWaitList; i++) {
+ auto EventQueue = EventWaitList[i]->UrQueue;
+ if (Queue != EventQueue) {
+ UseTmpWaitList = true;
+ break;
+ }
+ }
+ } else {
+ UseTmpWaitList = true;
+ }
+
  _ur_ze_event_list_t TmpWaitList;
- UR_CALL(TmpWaitList.createAndRetainUrZeEventList(
- NumEventsInWaitList, EventWaitList, Queue, UseCopyEngine));
+ TmpWaitList.ZeEventList = nullptr;
+ TmpWaitList.Length = 0;
+
+ if (UseTmpWaitList) {
+ UR_CALL(TmpWaitList.createAndRetainUrZeEventList(
+ NumEventsInWaitList, EventWaitList, Queue, UseCopyEngine));
+ }
 
  // Get a new command list to be used on this call
  ur_command_list_ptr_t CommandList{};
@@ -208,14 +227,17 @@ UR_APIEXPORT ur_result_t UR_APICALL urEnqueueKernelLaunch(
  UR_CALL(createEventAndAssociateQueue(Queue, Event, UR_COMMAND_KERNEL_LAUNCH,
  CommandList, IsInternal, false));
  ZeEvent = (*Event)->ZeEvent;
+
+ // If UseTmpWaitList is false, then it will leave TmpWaitList.ZeEventList as
+ // nullptr and TmpWaitList.Length as 0 (i.e. an empty WaitList)
  (*Event)->WaitList = TmpWaitList;
 
  // Save the kernel in the event, so that when the event is signalled
  // the code can do a urKernelRelease on this kernel.
  (*Event)->CommandData = (void *)Kernel;
 
- // Increment the reference count of the Kernel and indicate that the Kernel is
- // in use. Once the event has been signalled, the code in
+ // Increment the reference count of the Kernel and indicate that the Kernel
+ // is in use. Once the event has been signalled, the code in
  // CleanupCompletedEvent(Event) will do a urKernelRelease to update the
  // reference count on the kernel, using the kernel saved in CommandData.
  UR_CALL(urKernelRetain(Kernel));

source/adapters/level_zero/queue.cpp

@@ -1893,6 +1893,10 @@ ur_result_t ur_queue_handle_t_::createCommandList(
  ZeStruct<ze_command_list_desc_t> ZeCommandListDesc;
  ZeCommandListDesc.commandQueueGroupOrdinal = QueueGroupOrdinal;
 
+ if (Device->useDriverInOrderLists() && isInOrderQueue()) {
+ ZeCommandListDesc.flags = ZE_COMMAND_LIST_FLAG_IN_ORDER;
+ }
+
  ZE2UR_CALL(zeCommandListCreate, (Context->ZeContext, Device->ZeDevice,
  &ZeCommandListDesc, &ZeCommandList));
 
@@ -2006,8 +2010,11 @@ ur_command_list_ptr_t &ur_queue_handle_t_::ur_queue_group_t::getImmCmdList() {
  Priority = "High";
  }
 
- // Evaluate performance of explicit usage for "0" index.
- if (QueueIndex != 0) {
+ if (Queue->Device->useDriverInOrderLists() && Queue->isInOrderQueue()) {
+ ZeCommandQueueDesc.flags = ZE_COMMAND_QUEUE_FLAG_IN_ORDER;
+ urPrint("Using in-order driver implementation\n");
+ } else if (QueueIndex != 0) {
+ // Evaluate performance of explicit usage for "0" index.
  ZeCommandQueueDesc.flags = ZE_COMMAND_QUEUE_FLAG_EXPLICIT_ONLY;
  }