Add preview of the OpenCL adapter to the adapters branch

CMakeLists.txt

@@ -39,6 +39,7 @@ option(UMF_ENABLE_POOL_TRACKING "Build UMF with pool tracking" OFF)
 option(UR_BUILD_ADAPTER_L0 "build level 0 adapter from SYCL" OFF)
 option(UR_BUILD_ADAPTER_CUDA "build cuda adapter from SYCL" OFF)
 option(UR_BUILD_ADAPTER_HIP "build hip adapter from SYCL" OFF)
+option(UR_BUILD_ADAPTER_OPENCL "build opencl adapter from SYCL" OFF)
 
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)

source/adapters/CMakeLists.txt

@@ -36,6 +36,13 @@ if(UR_BUILD_ADAPTER_L0 OR UR_BUILD_ADAPTER_CUDA OR UR_BUILD_ADAPTER_HIP)
     FetchSource(https://github.com/intel/llvm.git nightly-2023-08-01 "sycl/plugins/unified_runtime/ur" ${SYCL_ADAPTER_DIR})
 endif()
 
+# Temporarily fetch the opencl adapter from a fork until the PR has been merged.
+if(UR_BUILD_ADAPTER_OPENCL)
+    # fetch adapter sources from SYCL
+    set(SYCL_ADAPTER_DIR "${CMAKE_CURRENT_SOURCE_DIR}/external")
+    FetchSource(https://github.com/fabiomestre/llvm.git opencl_adapter_unofficial "sycl/plugins/unified_runtime/ur" ${SYCL_ADAPTER_DIR})
+endif()
+
 if(UR_BUILD_ADAPTER_L0)
     add_subdirectory(level_zero)
 endif()
@@ -47,3 +54,7 @@ endif()
 if(UR_BUILD_ADAPTER_HIP)
     add_subdirectory(hip)
 endif()
+
+if(UR_BUILD_ADAPTER_OPENCL)
+    add_subdirectory(opencl)
+endif()

source/adapters/opencl/CMakeLists.txt

@@ -0,0 +1,90 @@
+# Copyright (C) 2023 Intel Corporation
+# Part of the Unified-Runtime Project, under the Apache License v2.0 with LLVM Exceptions.
+# See LICENSE.TXT
+# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+set(OPENCL_DIR "${SYCL_ADAPTER_DIR}/sycl/plugins/unified_runtime/ur/adapters/opencl" CACHE PATH "OpenCL adapter directory")
+
+set(TARGET_NAME ur_adapter_opencl)
+
+add_ur_adapter(${TARGET_NAME}
+        SHARED
+        ${OPENCL_DIR}/ur_interface_loader.cpp
+        ${OPENCL_DIR}/adapter.hpp
+        ${OPENCL_DIR}/adapter.cpp
+        ${OPENCL_DIR}/command_buffer.hpp
+        ${OPENCL_DIR}/command_buffer.cpp
+        ${OPENCL_DIR}/common.hpp
+        ${OPENCL_DIR}/common.cpp
+        ${OPENCL_DIR}/context.cpp
+        ${OPENCL_DIR}/context.hpp
+        ${OPENCL_DIR}/device.cpp
+        ${OPENCL_DIR}/device.hpp
+        ${OPENCL_DIR}/enqueue.cpp
+        ${OPENCL_DIR}/event.cpp
+        ${OPENCL_DIR}/image.cpp
+        ${OPENCL_DIR}/kernel.cpp
+        ${OPENCL_DIR}/memory.cpp
+        ${OPENCL_DIR}/platform.cpp
+        ${OPENCL_DIR}/platform.hpp
+        ${OPENCL_DIR}/program.cpp
+        ${OPENCL_DIR}/queue.cpp
+        ${OPENCL_DIR}/sampler.cpp
+        ${OPENCL_DIR}/usm.cpp
+        ${OPENCL_DIR}/usm_p2p.cpp
+        ${OPENCL_DIR}/../../ur.cpp
+        ${OPENCL_DIR}/../../ur.hpp
+        ${OPENCL_DIR}/../../ur.hpp
+)
+
+set_target_properties(${TARGET_NAME} PROPERTIES
+        VERSION "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}"
+        SOVERSION "${PROJECT_VERSION_MAJOR}"
+)
+
+find_package(Threads REQUIRED)
+
+if (NOT DEFINED OpenCL_LIBRARY OR NOT DEFINED OpenCL_INCLUDE_DIR)
+    message(WARNING "OpenCL_LIBRARY and OpenCL_INCLUDE_DIR are not set. Using find_package() to find an OpenCL installation in the system.")
+    find_package(OpenCL REQUIRED)
+endif()
+
+message(STATUS "OpenCL_LIBRARY: ${OpenCL_LIBRARY}")
+message(STATUS "OpenCL_INCLUDE_DIR: ${OpenCL_INCLUDE_DIR}")
+
+if (NOT OpenCL_HEADERS)
+    FetchContent_Declare(ocl-headers
+            GIT_REPOSITORY    ${OCL_HEADERS_REPO}
+            GIT_TAG           ${OCL_HEADERS_TAG}
+    )
+endif()
+
+# Make imported library global to use it within the project.
+add_library(OpenCL-ICD SHARED IMPORTED GLOBAL)
+
+if (WIN32)
+    set_target_properties(
+            OpenCL-ICD PROPERTIES
+            IMPORTED_IMPLIB               ${OpenCL_LIBRARY}
+            INTERFACE_INCLUDE_DIRECTORIES ${OpenCL_INCLUDE_DIR}
+    )
+else()
+    set_target_properties(
+            OpenCL-ICD PROPERTIES
+            IMPORTED_LOCATION             ${OpenCL_LIBRARY}
+            INTERFACE_INCLUDE_DIRECTORIES ${OpenCL_INCLUDE_DIR}
+    )
+endif()
+
+target_link_libraries(${TARGET_NAME} PRIVATE
+        ${PROJECT_NAME}::headers
+        ${PROJECT_NAME}::common
+        ${PROJECT_NAME}::unified_malloc_framework
+        Threads::Threads
+        OpenCL-ICD
+)
+
+target_include_directories(${TARGET_NAME} PRIVATE
+        ${OPENCL_DIR}/../../../
+        ${OpenCL_INCLUDE_DIR}
+)