Add OpenCL runtime

README.md

@@ -58,7 +58,15 @@ cmake --build . --target gc-check
 Notes:
  * `/PATH/TO/llvm-project/llvm-install` should be the install path of LLVM. If you installed LLVM elsewhere by `-DCMAKE_INSTALL_PREFIX` option when building LLVM, you need to change the path in `-DMLIR_DIR` accordingly.
  *  The cmake option `-DLLVM_EXTERNAL_LIT` is for the tests of this project. It requires the `lit` tool to be installed in the system. You can install it via `pip install lit`. If you don't need to run the tests of this repo, you can omit this option in the command line.
- * If GPU components are on (`-DGC_USE_GPU=ON`), make sure the Level-zero runtime is installed in your system. Either install Level-zero runtime via system package managers (e.g. `apt`), or follow the instructions of [IMEX](https://github.com/intel/mlir-extensions).
+
+More notes if GPU components are on (`-DGC_USE_GPU=ON`):
+ * make sure the OpenCL runtime is installed in your system. You can either
+  install using OS-provided package (Ubuntu 22.04)
+```sh
+sudo apt install -y intel-opencl-icd opencl-c-headers
+```
+  Or, download and install package from: https://github.com/intel/compute-runtime/releases
+ * the LLVM codebase needs to be patched to support XeGPU lowering (from IMEX). Please follow instructions of [IMEX](https://github.com/intel/mlir-extensions) on patching LLVM.
 
 Graph Compiler supports the following build-time options.
 

cmake/imex.cmake

@@ -4,11 +4,11 @@ get_property(IMEX_INCLUDES GLOBAL PROPERTY IMEX_INCLUDES)
 if (NOT DEFINED IMEX_INCLUDES)
     include(functions)
     set(IMEX_CHECK_LLVM_VERSION ON)
-    set(IMEX_ENABLE_L0_RUNTIME 1)
+    set(IMEX_ENABLE_L0_RUNTIME 0)
     # TODO: Change to main https://github.com/oneapi-src/oneDNN.git when all the
     # required functionality is merged.
     gc_fetch_content(imex 496b240093b5e132b60c5ee69878300fe69be300 https://github.com/Menooker/mlir-extensions
-            CMAKE_ARGS "-DMLIR_DIR=${MLIR_DIR};-DIMEX_CHECK_LLVM_VERSION=ON;-DIMEX_ENABLE_L0_RUNTIME=1"
+            CMAKE_ARGS "-DMLIR_DIR=${MLIR_DIR};-DIMEX_CHECK_LLVM_VERSION=ON;-DIMEX_ENABLE_L0_RUNTIME=0"
     )
 
     set(IMEX_INCLUDES

lib/gc/ExecutionEngine/CMakeLists.txt

@@ -1,2 +1,5 @@
 add_subdirectory(CPURuntime)
-add_subdirectory(Driver)
+add_subdirectory(Driver)
+if(GC_USE_GPU)
+    add_subdirectory(OpenCLRuntime)
+endif()

lib/gc/ExecutionEngine/OpenCLRuntime/CMakeLists.txt

@@ -0,0 +1,26 @@
+find_package(OpenCL REQUIRED)
+
+if(NOT OpenCL_FOUND)
+    message(FATAL_ERROR "OpenCL not found.")
+endif()
+
+add_mlir_library(opencl-runtime
+    SHARED
+    OpenCLRuntimeWrappers.cpp
+
+    EXCLUDE_FROM_LIBMLIR
+  )
+
+check_cxx_compiler_flag("-frtti" CXX_HAS_FRTTI_FLAG)
+if(NOT CXX_HAS_FRTTI_FLAG)
+    message(FATAL_ERROR "CXX compiler does not accept flag -frtti")
+endif()
+target_compile_options (opencl-runtime PUBLIC -fexceptions -frtti)
+
+target_include_directories(opencl-runtime PRIVATE
+    ${MLIR_INCLUDE_DIRS}
+    ${OpenCL_INCLUDE_DIRS}
+    )
+
+message(STATUS "OpenCL Libraries: ${OpenCL_LIBRARIES}")
+target_link_libraries(opencl-runtime PRIVATE ${OpenCL_LIBRARIES})