TheRock/rocm-systems/projects/rocr-runtime/runtime/hsa-runtime/image/blit_src

OVERVIEW

This directory contains the CMakeLists.txt for automatically generating the ASCII code object file, "opencl_blit_objects.cpp", which contains the blobs of the code object of the Image BLIT kernels for the devices supported on ROCm. The blobs are loaded by the image library and required to update whenever a new device is introduced.

ADD NEW DEVICE

To add a new supported device, the following steps are required:

1. Declare an extern variable of the device XXX, by adding the line of "extern uint32_t ocl_blit_object_gfxNNN[];" in "blit_kernel.cpp".
2. Update the BlitKernel::GetPatchedBlitObject() function to support the device by assigning "blit_code_object" to "ocl_blit_object_gfxNNN[]".
3. Add the target to the TARGET_DEVICES list in CMakeLists.txt. Specify using the target ID syntax which is the target GFX IP name, optionally followed by the settings for the target features such as XNACK and SRAMECC. If omitted, a target feature defaults to producing code that will execute on any setting. For example, "gfx908" for code that will run on any setting, or "gfx908:sramecc+:xnack-" for code that will only run if SRAMECC is enabled and XNACK is disabled.
4. Rebuild the image library.

REQUIREMENT

In order to create the code object file, the bitcodes of the kernels are generated by the compiler and the following bitcode libraries are required,

opencl.bc ocml.bc irif.bc oclc_correctly_rounded_sqrt_off.bc oclc_daz_opt_on.bc oclc_finite_only_off.bc oclc_isa_version_.bc oclc_unsafe_math_off.bc

where is the gfxip number of the GPU. The directory contains the bitcode libraries is specified in a CMake varaible.

There are several variables are required for CMake to build the code object file. All of them have default values, and defined as following:

  OPENCL_DIR - the location of installed OpenCL
               (Default: /opt/rocm/opencl)
 BITCODE_DIR - the directory contains the bitcode library
               (Default: /opt/rocm/amdgcn/bitcode)
    LLVM_DIR - the directory contains the clang, llvm-link and llvm-dis
               executables
               (Default: ${PROJECT_BUILD_DIR}/../lightning/bin)

TARGET_DEVICES - list of gpu types for kernel builds (eg. "gfx900;gfx902") (Default: "gfx900;gfx902;gfx904")

STEPS TO BUILD

$ make build $ cd build $ cmake -D${OPENCL_DIR} -D${BITCODE_DIR} -D${LLVM_DIR} -D${TARGET_DEVICES} .. $ make opencl_blit_objects.cpp