[mlir][gpu] Remove old GPU serialization passes (#94998)

This patch removes the last vestiges of the old gpu serialization
pipeline. To compile GPU code use target attributes instead.

See [Compilation overview | 'gpu' Dialect - MLIR
docs](https://mlir.llvm.org/docs/Dialects/GPU/#compilation-overview) for
additional information on the target attributes compilation pipeline
that replaced the old serialization pipeline.

Author: fabianmcg

mlir/docs/Dialects/GPU.md

@@ -37,9 +37,6 @@ complex lifetime analysis following the principles of MLIR that promote
 structure and representing analysis results in the IR.
 
 ## GPU Compilation
-### Deprecation notice
-The `--gpu-to-(cubin|hsaco)` passes will be deprecated in a future release.
-
 ### Compilation overview
 The compilation process in the GPU dialect has two main stages: GPU module
 serialization and offloading operations translation. Together these stages can

mlir/include/mlir/Config/mlir-config.h.cmake

@@ -20,9 +20,6 @@
 #ifndef MLIR_CONFIG_H
 #define MLIR_CONFIG_H
 
-/* If set, enable deprecated serialization passes. */
-#cmakedefine01 MLIR_DEPRECATED_GPU_SERIALIZATION_ENABLE
-
 /* Enable expensive checks to detect invalid pattern API usage. Failed checks
    manifest as fatal errors or invalid memory accesses (e.g., accessing
    deallocated memory) that cause a crash. Running with ASAN is recommended for

mlir/include/mlir/Conversion/Passes.td

@@ -478,7 +478,7 @@ def GpuToLLVMConversionPass : Pass<"gpu-to-llvm", "ModuleOp"> {
            /*default=*/"false",
              "Use bare pointers to pass memref arguments to kernels. "
              "The kernel must use the same setting for this option."
-           >
+          >
   ];
 
   let dependentDialects = [

mlir/include/mlir/Dialect/GPU/Transforms/Passes.h

@@ -91,75 +91,12 @@ namespace gpu {
 LogicalResult transformGpuModulesToBinaries(
     Operation *op, OffloadingLLVMTranslationAttrInterface handler = nullptr,
     const gpu::TargetOptions &options = {});
-
-/// Base pass class to serialize kernel functions through LLVM into
-/// user-specified IR and add the resulting blob as module attribute.
-class SerializeToBlobPass : public OperationPass<gpu::GPUModuleOp> {
-public:
-  SerializeToBlobPass(TypeID passID);
-  SerializeToBlobPass(const SerializeToBlobPass &other);
-
-  void runOnOperation() final;
-
-protected:
-  /// Hook allowing the application of optimizations before codegen
-  /// By default, does nothing
-  virtual LogicalResult optimizeLlvm(llvm::Module &llvmModule,
-                                     llvm::TargetMachine &targetMachine);
-
-  /// Translates the 'getOperation()' result to an LLVM module.
-  virtual std::unique_ptr<llvm::Module>
-  translateToLLVMIR(llvm::LLVMContext &llvmContext);
-
-private:
-  /// Creates the LLVM target machine to generate the ISA.
-  std::unique_ptr<llvm::TargetMachine> createTargetMachine();
-
-  /// Translates the module to ISA
-  std::optional<std::string> translateToISA(llvm::Module &llvmModule,
-                                            llvm::TargetMachine &targetMachine);
-
-  /// Serializes the target ISA to binary form.
-  virtual std::unique_ptr<std::vector<char>>
-  serializeISA(const std::string &isa) = 0;
-
-protected:
-  Option<std::string> triple{*this, "triple",
-                             ::llvm::cl::desc("Target triple")};
-  Option<std::string> chip{*this, "chip",
-                           ::llvm::cl::desc("Target architecture")};
-  Option<std::string> features{*this, "features",
-                               ::llvm::cl::desc("Target features")};
-  Option<int> optLevel{*this, "opt-level",
-                       llvm::cl::desc("Optimization level for compilation"),
-                       llvm::cl::init(2)};
-  Option<std::string> gpuBinaryAnnotation{
-      *this, "gpu-binary-annotation",
-      llvm::cl::desc("Annotation attribute string for GPU binary"),
-      llvm::cl::init(getDefaultGpuBinaryAnnotation())};
-  Option<bool> dumpPtx{*this, "dump-ptx",
-                       ::llvm::cl::desc("Dump generated PTX"),
-                       llvm::cl::init(false)};
-};
 } // namespace gpu
 
 //===----------------------------------------------------------------------===//
 // Registration
 //===----------------------------------------------------------------------===//
 
-/// Register pass to serialize GPU kernel functions to a HSAco binary
-/// annotation.
-LLVM_DEPRECATED("use Target attributes instead", "")
-void registerGpuSerializeToHsacoPass();
-
-/// Create an instance of the GPU kernel function to HSAco binary serialization
-/// pass.
-LLVM_DEPRECATED("use Target attributes instead", "")
-std::unique_ptr<Pass> createGpuSerializeToHsacoPass(StringRef triple,
-                                                    StringRef arch,
-                                                    StringRef features,
-                                                    int optLevel);
-
 /// Collect a set of patterns to decompose memrefs ops.
 void populateGpuDecomposeMemrefsPatterns(RewritePatternSet &patterns);
 

mlir/include/mlir/Dialect/GPU/Transforms/Utils.h

@@ -28,9 +28,6 @@ namespace gpu {
 class GPUFuncOp;
 class LaunchOp;
 
-/// Returns the default annotation name for GPU binary blobs.
-std::string getDefaultGpuBinaryAnnotation();
-
 /// Returns the matching vector combining kind.
 vector::CombiningKind convertReductionKind(gpu::AllReduceOperation mode);
 } // namespace gpu

mlir/lib/Dialect/GPU/CMakeLists.txt

@@ -1,17 +1,3 @@
-if (MLIR_ENABLE_ROCM_CONVERSIONS)
-  set(AMDGPU_LIBS
-    IRReader
-    IPO
-    linker
-    MCParser
-    AMDGPUAsmParser
-    AMDGPUCodeGen
-    AMDGPUDesc
-    AMDGPUInfo
-    target
-  )
-endif()
-
 add_mlir_dialect_library(MLIRGPUDialect
   IR/GPUDialect.cpp
   IR/InferIntRangeInterfaceImpls.cpp
@@ -51,8 +37,6 @@ add_mlir_dialect_library(MLIRGPUTransforms
   Transforms/NVVMAttachTarget.cpp
   Transforms/ParallelLoopMapper.cpp
   Transforms/ROCDLAttachTarget.cpp
-  Transforms/SerializeToBlob.cpp
-  Transforms/SerializeToHsaco.cpp
   Transforms/ShuffleRewriter.cpp
   Transforms/SPIRVAttachTarget.cpp
   Transforms/SubgroupReduceLowering.cpp
@@ -63,12 +47,6 @@ add_mlir_dialect_library(MLIRGPUTransforms
   ADDITIONAL_HEADER_DIRS
   ${MLIR_MAIN_INCLUDE_DIR}/mlir/Dialect/GPU
 
-  LINK_COMPONENTS
-  Core
-  MC
-  Target
-  ${AMDGPU_LIBS}
-
   DEPENDS
   MLIRGPUPassIncGen
   MLIRParallelLoopMapperEnumsGen
@@ -78,15 +56,12 @@ add_mlir_dialect_library(MLIRGPUTransforms
   MLIRArithDialect
   MLIRAsyncDialect
   MLIRBufferizationDialect
-  MLIRBuiltinToLLVMIRTranslation
   MLIRDataLayoutInterfaces
   MLIRExecutionEngineUtils
   MLIRGPUDialect
   MLIRIR
   MLIRIndexDialect
   MLIRLLVMDialect
-  MLIRGPUToLLVMIRTranslation
-  MLIRLLVMToLLVMIRTranslation
   MLIRMemRefDialect
   MLIRNVVMTarget
   MLIRPass
@@ -101,21 +76,3 @@ add_mlir_dialect_library(MLIRGPUTransforms
 
 add_subdirectory(TransformOps)
 add_subdirectory(Pipelines)
-
-if(MLIR_ENABLE_ROCM_CONVERSIONS)
-  if (NOT ("AMDGPU" IN_LIST LLVM_TARGETS_TO_BUILD))
-    message(SEND_ERROR
-      "Building mlir with ROCm support requires the AMDGPU backend")
-  endif()
-
-  set(DEFAULT_ROCM_PATH "/opt/rocm" CACHE PATH "Fallback path to search for ROCm installs")
-  target_compile_definitions(obj.MLIRGPUTransforms
-    PRIVATE
-    __DEFAULT_ROCM_PATH__="${DEFAULT_ROCM_PATH}"
-  )
-
-  target_link_libraries(MLIRGPUTransforms
-    PRIVATE
-    MLIRROCDLToLLVMIRTranslation
-  )
-endif()