Reland [mlir][Target] Improve ROCDL gpu serialization API #95813
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@llvm/pr-subscribers-mlir-gpu @llvm/pr-subscribers-mlir-llvm Author: Fabian Mora (fabianmcg) ChangesReland: #95456 This patch improves the ROCDL gpu serialization API by:
Patch is 24.31 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/95813.diff 4 Files Affected:
diff --git a/mlir/include/mlir/Target/LLVM/ROCDL/Utils.h b/mlir/include/mlir/Target/LLVM/ROCDL/Utils.h
index 374fa65bd02e3..44c9ded317fa5 100644
--- a/mlir/include/mlir/Target/LLVM/ROCDL/Utils.h
+++ b/mlir/include/mlir/Target/LLVM/ROCDL/Utils.h
@@ -27,6 +27,19 @@ namespace ROCDL {
/// 5. Returns an empty string.
StringRef getROCMPath();
+/// Helper enum for specifying the AMD GCN device libraries required for
+/// compilation.
+enum class AMDGCNLibraries : uint32_t {
+ None = 0,
+ Ockl = 1,
+ Ocml = 2,
+ OpenCL = 4,
+ Hip = 8,
+ LastLib = Hip,
+ LLVM_MARK_AS_BITMASK_ENUM(LastLib),
+ All = (LastLib << 1) - 1
+};
+
/// Base class for all ROCDL serializations from GPU modules into binary
/// strings. By default this class serializes into LLVM bitcode.
class SerializeGPUModuleBase : public LLVM::ModuleToObject {
@@ -49,8 +62,8 @@ class SerializeGPUModuleBase : public LLVM::ModuleToObject {
/// Returns the bitcode files to be loaded.
ArrayRef<std::string> getFileList() const;
- /// Appends standard ROCm device libraries like `ocml.bc`, `ockl.bc`, etc.
- LogicalResult appendStandardLibs();
+ /// Appends standard ROCm device libraries to `fileList`.
+ LogicalResult appendStandardLibs(AMDGCNLibraries libs);
/// Loads the bitcode files in `fileList`.
virtual std::optional<SmallVector<std::unique_ptr<llvm::Module>>>
@@ -63,15 +76,20 @@ class SerializeGPUModuleBase : public LLVM::ModuleToObject {
LogicalResult handleBitcodeFile(llvm::Module &module) override;
protected:
- /// Appends the paths of common ROCm device libraries to `libs`.
- LogicalResult getCommonBitcodeLibs(llvm::SmallVector<std::string> &libs,
- SmallVector<char, 256> &libPath,
- StringRef isaVersion);
-
/// Adds `oclc` control variables to the LLVM module.
- void addControlVariables(llvm::Module &module, bool wave64, bool daz,
- bool finiteOnly, bool unsafeMath, bool fastMath,
- bool correctSqrt, StringRef abiVer);
+ void addControlVariables(llvm::Module &module, AMDGCNLibraries libs,
+ bool wave64, bool daz, bool finiteOnly,
+ bool unsafeMath, bool fastMath, bool correctSqrt,
+ StringRef abiVer);
+
+ /// Compiles assembly to a binary.
+ virtual std::optional<SmallVector<char, 0>>
+ compileToBinary(const std::string &serializedISA);
+
+ /// Default implementation of `ModuleToObject::moduleToObject`.
+ std::optional<SmallVector<char, 0>>
+ moduleToObjectImpl(const gpu::TargetOptions &targetOptions,
+ llvm::Module &llvmModule);
/// Returns the assembled ISA.
std::optional<SmallVector<char, 0>> assembleIsa(StringRef isa);
@@ -84,6 +102,9 @@ class SerializeGPUModuleBase : public LLVM::ModuleToObject {
/// List of LLVM bitcode files to link to.
SmallVector<std::string> fileList;
+
+ /// AMD GCN libraries to use when linking, the default is using none.
+ AMDGCNLibraries deviceLibs = AMDGCNLibraries::None;
};
} // namespace ROCDL
} // namespace mlir
diff --git a/mlir/lib/Dialect/GPU/CMakeLists.txt b/mlir/lib/Dialect/GPU/CMakeLists.txt
index 61ab298ebfb98..08c8aea36fac9 100644
--- a/mlir/lib/Dialect/GPU/CMakeLists.txt
+++ b/mlir/lib/Dialect/GPU/CMakeLists.txt
@@ -106,7 +106,7 @@ if(MLIR_ENABLE_ROCM_CONVERSIONS)
"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")
+ set(DEFAULT_ROCM_PATH "" CACHE PATH "Fallback path to search for ROCm installs")
target_compile_definitions(obj.MLIRGPUTransforms
PRIVATE
__DEFAULT_ROCM_PATH__="${DEFAULT_ROCM_PATH}"
diff --git a/mlir/lib/Target/LLVM/CMakeLists.txt b/mlir/lib/Target/LLVM/CMakeLists.txt
index 5a3fa160850b4..6e146710d67af 100644
--- a/mlir/lib/Target/LLVM/CMakeLists.txt
+++ b/mlir/lib/Target/LLVM/CMakeLists.txt
@@ -123,17 +123,18 @@ add_mlir_dialect_library(MLIRROCDLTarget
)
if(MLIR_ENABLE_ROCM_CONVERSIONS)
- if (NOT ("AMDGPU" IN_LIST LLVM_TARGETS_TO_BUILD))
- message(SEND_ERROR
- "Building mlir with ROCm support requires the AMDGPU backend")
- endif()
-
if (DEFINED ROCM_PATH)
set(DEFAULT_ROCM_PATH "${ROCM_PATH}" CACHE PATH "Fallback path to search for ROCm installs")
elseif(DEFINED ENV{ROCM_PATH})
set(DEFAULT_ROCM_PATH "$ENV{ROCM_PATH}" CACHE PATH "Fallback path to search for ROCm installs")
else()
- set(DEFAULT_ROCM_PATH "/opt/rocm" CACHE PATH "Fallback path to search for ROCm installs")
+ IF (WIN32)
+ # Avoid setting an UNIX path for Windows.
+ # TODO: Eventually migrate to FindHIP once it becomes a part of CMake.
+ set(DEFAULT_ROCM_PATH "" CACHE PATH "Fallback path to search for ROCm installs")
+ else()
+ set(DEFAULT_ROCM_PATH "/opt/rocm" CACHE PATH "Fallback path to search for ROCm installs")
+ endif()
endif()
message(VERBOSE "MLIR Default ROCM toolkit path: ${DEFAULT_ROCM_PATH}")
diff --git a/mlir/lib/Target/LLVM/ROCDL/Target.cpp b/mlir/lib/Target/LLVM/ROCDL/Target.cpp
index cc13e5b7436ea..6784f3668bde3 100644
--- a/mlir/lib/Target/LLVM/ROCDL/Target.cpp
+++ b/mlir/lib/Target/LLVM/ROCDL/Target.cpp
@@ -17,9 +17,6 @@
#include "mlir/Dialect/LLVMIR/ROCDLDialect.h"
#include "mlir/Support/FileUtilities.h"
#include "mlir/Target/LLVM/ROCDL/Utils.h"
-#include "mlir/Target/LLVMIR/Dialect/GPU/GPUToLLVMIRTranslation.h"
-#include "mlir/Target/LLVMIR/Dialect/LLVMIR/LLVMToLLVMIRTranslation.h"
-#include "mlir/Target/LLVMIR/Dialect/ROCDL/ROCDLToLLVMIRTranslation.h"
#include "mlir/Target/LLVMIR/Export.h"
#include "llvm/IR/Constants.h"
@@ -112,8 +109,9 @@ SerializeGPUModuleBase::SerializeGPUModuleBase(
if (auto file = dyn_cast<StringAttr>(attr))
fileList.push_back(file.str());
- // Append standard ROCm device bitcode libraries to the files to be loaded.
- (void)appendStandardLibs();
+ // By default add all libraries if the toolkit path is not empty.
+ if (!getToolkitPath().empty())
+ deviceLibs = AMDGCNLibraries::All;
}
void SerializeGPUModuleBase::init() {
@@ -138,29 +136,67 @@ ArrayRef<std::string> SerializeGPUModuleBase::getFileList() const {
return fileList;
}
-LogicalResult SerializeGPUModuleBase::appendStandardLibs() {
+LogicalResult SerializeGPUModuleBase::appendStandardLibs(AMDGCNLibraries libs) {
+ if (libs == AMDGCNLibraries::None)
+ return success();
StringRef pathRef = getToolkitPath();
- if (!pathRef.empty()) {
- SmallVector<char, 256> path;
- path.insert(path.begin(), pathRef.begin(), pathRef.end());
- llvm::sys::path::append(path, "amdgcn", "bitcode");
- pathRef = StringRef(path.data(), path.size());
- if (!llvm::sys::fs::is_directory(pathRef)) {
- getOperation().emitRemark() << "ROCm amdgcn bitcode path: " << pathRef
- << " does not exist or is not a directory.";
- return failure();
- }
- StringRef isaVersion =
- llvm::AMDGPU::getArchNameAMDGCN(llvm::AMDGPU::parseArchAMDGCN(chip));
- isaVersion.consume_front("gfx");
- return getCommonBitcodeLibs(fileList, path, isaVersion);
+ // Fail if the toolkit is empty.
+ if (pathRef.empty())
+ return failure();
+
+ // Get the path for the device libraries
+ SmallString<256> path;
+ path.insert(path.begin(), pathRef.begin(), pathRef.end());
+ llvm::sys::path::append(path, "amdgcn", "bitcode");
+ pathRef = StringRef(path.data(), path.size());
+
+ // Fail if the path is invalid.
+ if (!llvm::sys::fs::is_directory(pathRef)) {
+ getOperation().emitRemark() << "ROCm amdgcn bitcode path: " << pathRef
+ << " does not exist or is not a directory";
+ return failure();
}
+
+ // Get the ISA version.
+ StringRef isaVersion =
+ llvm::AMDGPU::getArchNameAMDGCN(llvm::AMDGPU::parseArchAMDGCN(chip));
+ isaVersion.consume_front("gfx");
+
+ // Helper function for adding a library.
+ auto addLib = [&](const Twine &lib) -> bool {
+ auto baseSize = path.size();
+ llvm::sys::path::append(path, lib);
+ StringRef pathRef(path.data(), path.size());
+ if (!llvm::sys::fs::is_regular_file(pathRef)) {
+ getOperation().emitRemark() << "bitcode library path: " << pathRef
+ << " does not exist or is not a file";
+ return true;
+ }
+ fileList.push_back(pathRef.str());
+ path.truncate(baseSize);
+ return false;
+ };
+
+ // Add ROCm device libraries. Fail if any of the libraries is not found, ie.
+ // if any of the `addLib` failed.
+ if ((any(libs & AMDGCNLibraries::Ocml) && addLib("ocml.bc")) ||
+ (any(libs & AMDGCNLibraries::Ockl) && addLib("ockl.bc")) ||
+ (any(libs & AMDGCNLibraries::Hip) && addLib("hip.bc")) ||
+ (any(libs & AMDGCNLibraries::OpenCL) && addLib("opencl.bc")) ||
+ (any(libs & (AMDGCNLibraries::Ocml | AMDGCNLibraries::Ockl)) &&
+ addLib("oclc_isa_version_" + isaVersion + ".bc")))
+ return failure();
return success();
}
std::optional<SmallVector<std::unique_ptr<llvm::Module>>>
SerializeGPUModuleBase::loadBitcodeFiles(llvm::Module &module) {
SmallVector<std::unique_ptr<llvm::Module>> bcFiles;
+ // Return if there are no libs to load.
+ if (deviceLibs == AMDGCNLibraries::None && fileList.empty())
+ return bcFiles;
+ if (failed(appendStandardLibs(deviceLibs)))
+ return std::nullopt;
if (failed(loadBitcodeFilesFromList(module.getContext(), fileList, bcFiles,
true)))
return std::nullopt;
@@ -174,80 +210,76 @@ LogicalResult SerializeGPUModuleBase::handleBitcodeFile(llvm::Module &module) {
// Stop spamming us with clang version numbers
if (auto *ident = module.getNamedMetadata("llvm.ident"))
module.eraseNamedMetadata(ident);
+ // Override the libModules datalayout and target triple with the compiler's
+ // data layout should there be a discrepency.
+ setDataLayoutAndTriple(module);
return success();
}
void SerializeGPUModuleBase::handleModulePreLink(llvm::Module &module) {
- [[maybe_unused]] std::optional<llvm::TargetMachine *> targetMachine =
- getOrCreateTargetMachine();
- assert(targetMachine && "expect a TargetMachine");
- addControlVariables(module, target.hasWave64(), target.hasDaz(),
+ // If all libraries are not set, traverse the module to determine which
+ // libraries are required.
+ if (deviceLibs != AMDGCNLibraries::All) {
+ for (llvm::Function &f : module.functions()) {
+ if (f.hasExternalLinkage() && f.hasName() && !f.hasExactDefinition()) {
+ StringRef funcName = f.getName();
+ if ("printf" == funcName)
+ deviceLibs |= AMDGCNLibraries::OpenCL | AMDGCNLibraries::Ockl |
+ AMDGCNLibraries::Ocml;
+ if (funcName.starts_with("__ockl_"))
+ deviceLibs |= AMDGCNLibraries::Ockl;
+ if (funcName.starts_with("__ocml_"))
+ deviceLibs |= AMDGCNLibraries::Ocml;
+ }
+ }
+ }
+ addControlVariables(module, deviceLibs, target.hasWave64(), target.hasDaz(),
target.hasFiniteOnly(), target.hasUnsafeMath(),
target.hasFastMath(), target.hasCorrectSqrt(),
target.getAbi());
}
-// Get the paths of ROCm device libraries.
-LogicalResult SerializeGPUModuleBase::getCommonBitcodeLibs(
- llvm::SmallVector<std::string> &libs, SmallVector<char, 256> &libPath,
- StringRef isaVersion) {
- auto addLib = [&](StringRef path) -> bool {
- if (!llvm::sys::fs::is_regular_file(path)) {
- getOperation().emitRemark() << "Bitcode library path: " << path
- << " does not exist or is not a file.\n";
- return true;
- }
- libs.push_back(path.str());
- return false;
- };
- auto getLibPath = [&libPath](Twine lib) {
- auto baseSize = libPath.size();
- llvm::sys::path::append(libPath, lib + ".bc");
- std::string path(StringRef(libPath.data(), libPath.size()).str());
- libPath.truncate(baseSize);
- return path;
- };
-
- // Add ROCm device libraries. Fail if any of the libraries is not found.
- if (addLib(getLibPath("ocml")) || addLib(getLibPath("ockl")) ||
- addLib(getLibPath("hip")) || addLib(getLibPath("opencl")) ||
- addLib(getLibPath("oclc_isa_version_" + isaVersion)))
- return failure();
- return success();
-}
-
void SerializeGPUModuleBase::addControlVariables(
- llvm::Module &module, bool wave64, bool daz, bool finiteOnly,
- bool unsafeMath, bool fastMath, bool correctSqrt, StringRef abiVer) {
- llvm::Type *i8Ty = llvm::Type::getInt8Ty(module.getContext());
- auto addControlVariable = [i8Ty, &module](StringRef name, bool enable) {
+ llvm::Module &module, AMDGCNLibraries libs, bool wave64, bool daz,
+ bool finiteOnly, bool unsafeMath, bool fastMath, bool correctSqrt,
+ StringRef abiVer) {
+ // Return if no device libraries are required.
+ if (libs == AMDGCNLibraries::None)
+ return;
+ // Helper function for adding control variables.
+ auto addControlVariable = [&module](StringRef name, uint32_t value,
+ uint32_t bitwidth) {
+ if (module.getNamedGlobal(name)) {
+ return;
+ }
+ llvm::IntegerType *type =
+ llvm::IntegerType::getIntNTy(module.getContext(), bitwidth);
llvm::GlobalVariable *controlVariable = new llvm::GlobalVariable(
- module, i8Ty, true, llvm::GlobalValue::LinkageTypes::LinkOnceODRLinkage,
- llvm::ConstantInt::get(i8Ty, enable), name, nullptr,
- llvm::GlobalValue::ThreadLocalMode::NotThreadLocal, 4);
+ module, /*isConstant=*/type, true,
+ llvm::GlobalValue::LinkageTypes::LinkOnceODRLinkage,
+ llvm::ConstantInt::get(type, value), name, /*before=*/nullptr,
+ /*threadLocalMode=*/llvm::GlobalValue::ThreadLocalMode::NotThreadLocal,
+ /*addressSpace=*/4);
controlVariable->setVisibility(
llvm::GlobalValue::VisibilityTypes::ProtectedVisibility);
- controlVariable->setAlignment(llvm::MaybeAlign(1));
+ controlVariable->setAlignment(llvm::MaybeAlign(bitwidth / 8));
controlVariable->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Local);
};
- addControlVariable("__oclc_finite_only_opt", finiteOnly || fastMath);
- addControlVariable("__oclc_unsafe_math_opt", unsafeMath || fastMath);
- addControlVariable("__oclc_daz_opt", daz || fastMath);
- addControlVariable("__oclc_correctly_rounded_sqrt32",
- correctSqrt && !fastMath);
- addControlVariable("__oclc_wavefrontsize64", wave64);
-
- llvm::Type *i32Ty = llvm::Type::getInt32Ty(module.getContext());
- int abi = 500;
- abiVer.getAsInteger(0, abi);
- llvm::GlobalVariable *abiVersion = new llvm::GlobalVariable(
- module, i32Ty, true, llvm::GlobalValue::LinkageTypes::LinkOnceODRLinkage,
- llvm::ConstantInt::get(i32Ty, abi), "__oclc_ABI_version", nullptr,
- llvm::GlobalValue::ThreadLocalMode::NotThreadLocal, 4);
- abiVersion->setVisibility(
- llvm::GlobalValue::VisibilityTypes::ProtectedVisibility);
- abiVersion->setAlignment(llvm::MaybeAlign(4));
- abiVersion->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Local);
+ // Add ocml related control variables.
+ if (any(libs & AMDGCNLibraries::Ocml)) {
+ addControlVariable("__oclc_finite_only_opt", finiteOnly || fastMath, 8);
+ addControlVariable("__oclc_daz_opt", daz || fastMath, 8);
+ addControlVariable("__oclc_correctly_rounded_sqrt32",
+ correctSqrt && !fastMath, 8);
+ addControlVariable("__oclc_unsafe_math_opt", unsafeMath || fastMath, 8);
+ }
+ // Add ocml or ockl related control variables.
+ if (any(libs & (AMDGCNLibraries::Ocml | AMDGCNLibraries::Ockl))) {
+ addControlVariable("__oclc_wavefrontsize64", wave64, 8);
+ int abi = 500;
+ abiVer.getAsInteger(0, abi);
+ addControlVariable("__oclc_ABI_version", abi, 32);
+ }
}
std::optional<SmallVector<char, 0>>
@@ -312,48 +344,16 @@ SerializeGPUModuleBase::assembleIsa(StringRef isa) {
parser->setTargetParser(*tap);
parser->Run(false);
-
return result;
}
-#if MLIR_ENABLE_ROCM_CONVERSIONS
-namespace {
-class AMDGPUSerializer : public SerializeGPUModuleBase {
-public:
- AMDGPUSerializer(Operation &module, ROCDLTargetAttr target,
- const gpu::TargetOptions &targetOptions);
-
- gpu::GPUModuleOp getOperation();
-
- // Compile to HSA.
- std::optional<SmallVector<char, 0>>
- compileToBinary(const std::string &serializedISA);
-
- std::optional<SmallVector<char, 0>>
- moduleToObject(llvm::Module &llvmModule) override;
-
-private:
- // Target options.
- gpu::TargetOptions targetOptions;
-};
-} // namespace
-
-AMDGPUSerializer::AMDGPUSerializer(Operation &module, ROCDLTargetAttr target,
- const gpu::TargetOptions &targetOptions)
- : SerializeGPUModuleBase(module, target, targetOptions),
- targetOptions(targetOptions) {}
-
-gpu::GPUModuleOp AMDGPUSerializer::getOperation() {
- return dyn_cast<gpu::GPUModuleOp>(&SerializeGPUModuleBase::getOperation());
-}
-
std::optional<SmallVector<char, 0>>
-AMDGPUSerializer::compileToBinary(const std::string &serializedISA) {
+SerializeGPUModuleBase::compileToBinary(const std::string &serializedISA) {
// Assemble the ISA.
std::optional<SmallVector<char, 0>> isaBinary = assembleIsa(serializedISA);
if (!isaBinary) {
- getOperation().emitError() << "Failed during ISA assembling.";
+ getOperation().emitError() << "failed during ISA assembling";
return std::nullopt;
}
@@ -363,7 +363,7 @@ AMDGPUSerializer::compileToBinary(const std::string &serializedISA) {
if (llvm::sys::fs::createTemporaryFile("kernel%%", "o", tempIsaBinaryFd,
tempIsaBinaryFilename)) {
getOperation().emitError()
- << "Failed to create a temporary file for dumping the ISA binary.";
+ << "failed to create a temporary file for dumping the ISA binary";
return std::nullopt;
}
llvm::FileRemover cleanupIsaBinary(tempIsaBinaryFilename);
@@ -378,7 +378,7 @@ AMDGPUSerializer::compileToBinary(const std::string &serializedISA) {
if (llvm::sys::fs::createTemporaryFile("kernel", "hsaco",
tempHsacoFilename)) {
getOperation().emitError()
- << "Failed to create a temporary file for the HSA code object.";
+ << "failed to create a temporary file for the HSA code object";
return std::nullopt;
}
llvm::FileRemover cleanupHsaco(tempHsacoFilename);
@@ -389,7 +389,7 @@ AMDGPUSerializer::compileToBinary(const std::string &serializedISA) {
lldPath,
{"ld.lld", "-shared", tempIsaBinaryFilename, "-o", tempHsacoFilename});
if (lldResult != 0) {
- getOperation().emitError() << "lld invocation failed.";
+ getOperation().emitError() << "lld invocation failed";
return std::nullopt;
}
@@ -398,7 +398,7 @@ AMDGPUSerializer::compileToBinary(const std::string &serializedISA) {
llvm::MemoryBuffer::getFile(tempHsacoFilename, /*IsText=*/false);
if (!hsacoFile) {
getOperation().emitError()
- << "Failed to read the HSA code object from the temp file.";
+ << "failed to read the HSA code object from the temp file";
return std::nullopt;
}
@@ -407,13 +407,13 @@ AMDGPUSerializer::compileToBinary(const std::string &serializedISA) {
return SmallVector<char, 0>(buffer.begin(), buffer.end());
}
-std::optional<SmallVector<char, 0>>
-AMDGPUSerializer::moduleToObject(llvm::Module &llvmModule) {
+std::optional<SmallVector<char, 0>> SerializeGPUModuleBase::moduleToObjectImpl(
+ const gpu::TargetOptions &targetOptions, llvm::Module &llvmModule) {
// Return LLVM IR if the compilation target is offload.
#define DEBUG_TYPE "serialize-to-llvm"
LLVM_DEBUG({
- llvm::dbgs() << "LLVM IR for module: " << getOperation().getNameAttr()
- << "\n"
+ llvm::dbgs() << "LLVM IR for module: "
+ << cast<gpu::GPUModuleOp>(getOperation()).getNameAttr() << "\n"
<< llvmModule << "\n";
});
#undef DEBUG_TYPE
@@ -423,8 +423,8 @@ AMDGPUSerializer::moduleToObject(llvm::Module &llvmModule) {
std::optional<llvm::TargetMachine *> targetMachine =
getOrCreateTargetMachine();
if (!targetMachine) {
- getOperation().emitError() << "Target Machine unavailable for t...
[truncated]
|
krzysz00
approved these changes
Jun 17, 2024
fabianmcg
added a commit
that referenced
this pull request
Jun 17, 2024
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Reland: #95456
This patch improves the ROCDL gpu serialization API by:
AMDGCNLibrariesfor specifying the AMD GCN device code libraries to use during linking.getCommonBitcodeLibsin favor ofAMDGCNLibraries. PreviouslygetCommonBitcodeLibswould try to load all AMD GCN bitcode librariesm now it will only load the requested libraries.compileToBinarymethod and making it virtual, allowing downstream users to re-use this method.moduleToObjectImpl, this method provides a prototype flow for compiling to binary, allowing downstream users to re-use this method.