[L0 v2] Make L0 v2 implementation a seperate adapter

Initially, L0 v2 adapter was supposed to reside in a separate
namespace but be a part of legacy L0 adapter (with runtime option
to switch between executing on legacy or v2). However, this
turns out to require a lot of changes in the legacy code to
allow for function dispatching to legacy/v2 implementations of
queue, event, etc.

This approach allows us to keep the implementations separate while
still resuing files when appropriate (e.g. for adapter.cpp or
platform.cpp).

CMakeLists.txt

@@ -51,6 +51,7 @@ option(UR_BUILD_ADAPTER_CUDA "Build the CUDA adapter" OFF)
 option(UR_BUILD_ADAPTER_HIP "Build the HIP adapter" OFF)
 option(UR_BUILD_ADAPTER_NATIVE_CPU "Build the Native-CPU adapter" OFF)
 option(UR_BUILD_ADAPTER_ALL "Build all currently supported adapters" OFF)
+option(UR_BUILD_ADAPTER_L0_V2 "Build the (experimental) Level-Zero v2 adapter" OFF)
 option(UR_BUILD_EXAMPLE_CODEGEN "Build the codegen example." OFF)
 option(VAL_USE_LIBBACKTRACE_BACKTRACE "enable libbacktrace validation backtrace for linux" OFF)
 option(UR_ENABLE_ASSERTIONS "Enable assertions for all build types" OFF)

scripts/generate_code.py

@@ -465,7 +465,7 @@ def generate_level_zero_queue_api(path, section, namespace, tags, version, specs
 
     name = "queue_api"
     filename = "queue_api.cpp"
-    layer_dstpath = os.path.join(path, "adapters/level_zero")
+    layer_dstpath = os.path.join(path, "adapters", "level_zero", "v2")
     os.makedirs(layer_dstpath, exist_ok=True)
     fout = os.path.join(layer_dstpath, filename)
 

source/adapters/level_zero/CMakeLists.txt

@@ -113,10 +113,6 @@ add_ur_adapter(${TARGET_NAME}
     ${CMAKE_CURRENT_SOURCE_DIR}/queue_api.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/queue.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/sampler.hpp
-    ${CMAKE_CURRENT_SOURCE_DIR}/v2/queue_immediate_in_order.hpp
-    ${CMAKE_CURRENT_SOURCE_DIR}/v2/queue_factory.hpp
-    ${CMAKE_CURRENT_SOURCE_DIR}/v2/context.hpp
-    ${CMAKE_CURRENT_SOURCE_DIR}/v2/command_list_cache.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/ur_level_zero.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/common.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/context.cpp
@@ -136,9 +132,6 @@ add_ur_adapter(${TARGET_NAME}
     ${CMAKE_CURRENT_SOURCE_DIR}/sampler.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/image.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/../../ur/ur.cpp
-    ${CMAKE_CURRENT_SOURCE_DIR}/v2/queue_immediate_in_order.cpp
-    ${CMAKE_CURRENT_SOURCE_DIR}/v2/context.cpp
-    ${CMAKE_CURRENT_SOURCE_DIR}/v2/command_list_cache.cpp
 )
 
 if(NOT WIN32)
@@ -175,3 +168,81 @@ target_include_directories(${TARGET_NAME} PRIVATE
     "${CMAKE_CURRENT_SOURCE_DIR}/../../"
     LevelZeroLoader-Headers
 )
+
+if(UR_BUILD_ADAPTER_L0_V2)
+    add_ur_adapter(ur_adapter_level_zero_v2
+        SHARED
+        # sources shared with legacy adapter
+        ${CMAKE_CURRENT_SOURCE_DIR}/adapter.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/common.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/device.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/platform.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/adapter.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/common.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/device.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/ur_interface_loader.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/platform.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/../../ur/ur.cpp
+        # v2-only sources
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/command_list_cache.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/context.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/event_pool_cache.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/event_pool.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/event_provider_counter.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/event_provider_normal.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/event_provider.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/event.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/queue_api.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/queue_immediate_in_order.hpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/api.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/command_list_cache.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/context.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/event_pool_cache.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/event_pool.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/event_provider_counter.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/event_provider_normal.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/event.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/queue_api.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/queue_create.cpp
+        ${CMAKE_CURRENT_SOURCE_DIR}/v2/queue_immediate_in_order.cpp
+    )
+
+    # api.cpp contains NOT_SUPPORTED functions-only
+    set_source_files_properties(${CMAKE_CURRENT_SOURCE_DIR}/v2/api.cpp
+        PROPERTIES APPEND_STRING PROPERTY COMPILE_FLAGS "-Wno-unused-parameter")
+
+    if(NOT WIN32)
+        target_sources(ur_adapter_level_zero_v2
+            PRIVATE
+                ${CMAKE_CURRENT_SOURCE_DIR}/adapter_lib_init_linux.cpp
+        )
+    endif()
+
+    # TODO: fix level_zero adapter conversion warnings
+    target_compile_options(ur_adapter_level_zero_v2 PRIVATE
+        $<$<CXX_COMPILER_ID:MSVC>:/wd4805 /wd4244>
+    )
+
+    set_target_properties(ur_adapter_level_zero_v2 PROPERTIES
+        VERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}"
+        SOVERSION "${PROJECT_VERSION_MAJOR}"
+    )
+
+    if (WIN32)
+    # 0x800: Search for the DLL only in the System32 folder
+    target_link_options(ur_adapter_level_zero_v2 PUBLIC /DEPENDENTLOADFLAG:0x800)
+    endif()
+
+    target_link_libraries(ur_adapter_level_zero_v2 PRIVATE
+        ${PROJECT_NAME}::headers
+        ${PROJECT_NAME}::common
+        ${PROJECT_NAME}::umf
+        LevelZeroLoader
+        LevelZeroLoader-Headers
+    )
+
+    target_include_directories(ur_adapter_level_zero_v2 PRIVATE
+        "${CMAKE_CURRENT_SOURCE_DIR}/../.."
+        LevelZeroLoader-Headers
+    )
+endif()

source/adapters/level_zero/context.cpp

@@ -18,8 +18,6 @@
 #include "queue.hpp"
 #include "ur_level_zero.hpp"
 
-#include "v2/context.hpp"
-
 UR_APIEXPORT ur_result_t UR_APICALL urContextCreate(
     uint32_t DeviceCount, ///< [in] the number of devices given in phDevices
     const ur_device_handle_t
@@ -38,7 +36,7 @@ UR_APIEXPORT ur_result_t UR_APICALL urContextCreate(
   ZE2UR_CALL(zeContextCreate, (Platform->ZeDriver, &ContextDesc, &ZeContext));
   try {
     ur_context_handle_t_ *Context =
-        new v2::ur_context_handle_t_(ZeContext, DeviceCount, Devices, true);
+        new ur_context_handle_t_(ZeContext, DeviceCount, Devices, true);
 
     Context->initialize();
     *RetContext = reinterpret_cast<ur_context_handle_t>(Context);

source/adapters/level_zero/queue.cpp

@@ -24,8 +24,6 @@
 #include "ur_util.hpp"
 #include "ze_api.h"
 
-#include "v2/queue_factory.hpp"
-
 // Hard limit for the event completion batches.
 static const uint64_t CompletionBatchesMax = [] {
   // Default value chosen empirically to maximize the number of asynchronous
@@ -501,12 +499,6 @@ UR_APIEXPORT ur_result_t UR_APICALL urQueueCreate(
 
   UR_ASSERT(Context->isValidDevice(Device), UR_RESULT_ERROR_INVALID_DEVICE);
 
-  // optimized path for immediate, in-order command lists
-  if (v2::shouldUseQueueV2(Device, Flags)) {
-    *Queue = v2::createQueue(Context, Device, Props);
-    return UR_RESULT_SUCCESS;
-  }
-
   // Create placeholder queues in the compute queue group.
   // Actual L0 queues will be created at first use.
   std::vector<ze_command_queue_handle_t> ZeComputeCommandQueues(

source/adapters/level_zero/v2/README.md

@@ -2,13 +2,14 @@
 
 This is the home directory for L0 v2 adapter sources. This is a redesigned version of the L0 adapter that focuses on maximizing the performance of each queue mode individually (immediate/batched, in-order/out-of-order).
 
-L0 v2 adapter can be enabled by setting `UR_L0_USE_QUEUE_V2=1` env variable. If the variable is not set, legacy path will be used.
+L0 v2 adapter can be enabled by setting passing `UR_BUILD_ADAPTER_L0_V2=1` option to cmake. When enabled, `libur_adapter_level_zero_v2.[so|dll]` will be created.
 
 # Code structure
 
-v2 adapter only rewrites certain functions (mostly urEnqueue* functions) while reusing the rest. `ur_queue_handle_t` has become an abstract class and each enqueue function a virtual function.
+v2 adapters is is a standalone adapter but reuses some logic from the legacy L0 adapter implementation - most notably: adapter.cpp, platform.cpp, device.cpp
 
-Legacy enqeue path is implemented in `ur_queue_handle_legacy_t` which inherits from `ur_queue_handle_t`. For new, optimized path, each queue mode will be implemented as a separate queue class (e.g. `v2::ur_queue_immediate_in_order_t`) inheriting from `ur_queue_handle_t`.
+Each queue mode will be implemented as a separate queue class (e.g. `v2::ur_queue_immediate_in_order_t`) inheriting from `ur_queue_handle_t` which is an abstract class
+in v2 adapter.
 
 `ur_queue_handle_t` is auto-generated by `make generate-code` - for every API function that accepts `ur_queue_handle_t` as a first parameter, new pure virtual method is created. The API function is then
-auto-implemented (see ../queue_api.cpp) by dispatching to that virtual method. Developer is only responsbile for implementing that virtual function for every queue base class.
+auto-implemented (see ./queue_api.cpp) by dispatching to that virtual method. Developer is only responsbile for implementing that virtual function for every queue base class.