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tpkessler / rocMLIR

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MLIR-based convolution and GEMM kernel generator for ROCm

This is the repository for a MLIR-based convolution and GEMM kernel generator targetting AMD hardware. This generator is mainly used from MIOpen and MIGraphX, but it can be used on a standalone basis. (The ability to use this code via torch-mlir is being investigated as well.)

Building (and testing)

To build the system

mkdir build
cd build
cmake -G Ninja .. -DCMAKE_BUILD_TYPE=RelWithDebInfo
ninja check-rocmlir

By default, xdlops tests are enabled on MI-100, MI-200, and any other system that supports mfma instructions. xdlops tests are disabled on GPUs that do not support mfma instructions. To disable xdlops tests on GPUs that supports mfma instructions, add -DROCMLIR_GEN_FLAGS="-mfma=off" to the cmake invocation above.

To not actually run the tests, use check-rocmlir-build-only.

To build the static library that is used by MIOpen

mkdir build
cd build
cmake -G Ninja .. -DBUILD_FAT_LIBROCKCOMPILER -DCMAKE_BUILD_TYPE=Release
ninja librockCompiler

and to install it so MIOpen can find it

cmake --install . --component librockCompiler --prefix [your MIOpen deps]

Standalone usage

For usage examples, see mlir/test/rocmlir-driver, especiallly the files sanity.mlir and the contents of the e2e_for_pr directory.

This project also includes cod that translates from TOSA to kernels, see mlir/test/fusion for examples of how to invoke it.

In general (with all invocations given from the build directory)

  • ./bin/rocmlir-gen generates high-level convolution operations and host code. Many of the options control data layout, size, etc, but some other useful flags are:
    • -mfma=on (which enables mfma usage)
    • -mfma=off (which disables mfma usage)
    • -ph (which causes host code to be generated)
    • -pv (which makes the host code validtae the results against a reference)
    • -pv_with_gpu (which uses a GPU validator instead)
    • -pr (which prints kkrnel results)
  • ./bin/rocmlir-driver is a wrapper around the kernel generation pipeline. Use -c (or --kernel-pipeline=full --host-pipeline=runner) to run the default pipeline

The result of the above pipeline can be passed to ./external/llvm-project/llvm/bin/mlir-cpu-runner .

mlir-cpu-runner needs to link the generated host code against libraries that map from MLIR operations to the HIP runtime. The required command-line arguments (if running from build/) are

./external/llvm-project/llvm/bin/mlir-cpu-runner --shared-libs=./external/llvm-project/llvm/lib/libmlir_rocm_runtime.so,./lib/libconv-validation-wrappers.so,./external/llvm-project/llvm/lib/libmlir_runner_utils.so --entry-point-result=void

Adding --debug-only=serialize-to-blob to the rocmlir-driver invocation will cause the GCN assembly code for the kernels being executed to be dumped to standard error.

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