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083bbd1e8df9c5a38826b071545879233e49fa54
triton/lib/driver/module.cc
Philippe Tillet 083bbd1e8d [GENERAL] Merged v1.0alpha into master. Added features are: 
- A100 support via mma.16816
- Thread swizzling for conflict-free shared memory accesses without
padding
- Complete overhaul of the LLVM code generation in
codegen/selection/generator.cc to remove overengineering
- Added debugging capabilities in the Python binding
- Compilation error for kernels that spill
2021-07-27 12:38:48 -07:00

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/* Copyright 2015-2017 Philippe Tillet
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <fstream>
#include <unistd.h>
#include <memory>
#include <regex>
#include "triton/driver/module.h"
#include "triton/driver/context.h"
#include "triton/driver/error.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Verifier.h"
#include "llvm/IR/IRPrintingPasses.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CodeGen.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/SourceMgr.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/ExecutionEngine/ExecutionEngine.h"
#include "llvm/ExecutionEngine/SectionMemoryManager.h"
#include "llvm/Transforms/Utils/Cloning.h"
std::string exec(const char* cmd) {
std::array<char, 128> buffer;
std::string result;
std::unique_ptr<FILE, decltype(&pclose)> pipe(popen(cmd, "r"), pclose);
if (!pipe) {
throw std::runtime_error("popen() failed!");
}
while (fgets(buffer.data(), buffer.size(), pipe.get()) != nullptr) {
result += buffer.data();
}
return result;
}
namespace triton
{
namespace driver
{
/* ------------------------ */
// Base //
/* ------------------------ */
void module::init_llvm() {
static bool init = false;
if(!init){
llvm::InitializeAllTargetInfos();
llvm::InitializeAllTargets();
llvm::InitializeAllTargetMCs();
llvm::InitializeAllAsmParsers();
llvm::InitializeAllAsmPrinters();
init = true;
}
}
module::module(CUmodule mod, bool has_ownership)
: polymorphic_resource(mod, has_ownership), spilled_(0) {
}
module::module(host_module_t mod, bool has_ownership)
: polymorphic_resource(mod, has_ownership), spilled_(0) {
}
module* module::create(driver::device* device, std::unique_ptr<llvm::Module> src) {
switch(device->backend()){
case CUDA: return new cu_module(device, std::move(src));
case Host: return new host_module(std::move(src));
default: throw std::runtime_error("unknown backend");
}
}
void module::compile_llvm_module(std::unique_ptr<llvm::Module> module, const std::string& triple,
const std::string &proc, std::string layout,
llvm::SmallVectorImpl<char> &buffer,
const std::string& features,
file_type_t ft) {
init_llvm();
// // debug
llvm::legacy::PassManager pm;
std::string tmp;
// llvm::raw_string_ostream oss(llir_);
// pm.add(llvm::createPrintModulePass(llvm::outs()));
pm.add(llvm::createVerifierPass());
pm.run(*module);
// create machine
module->setTargetTriple(triple);
std::string error;
auto target = llvm::TargetRegistry::lookupTarget(module->getTargetTriple(), error);
llvm::TargetOptions opt;
opt.AllowFPOpFusion = llvm::FPOpFusion::Fast;
opt.UnsafeFPMath = false;
opt.NoInfsFPMath = false;
opt.NoNaNsFPMath = true;
llvm::TargetMachine *machine = target->createTargetMachine(module->getTargetTriple(), proc, features, opt,
llvm::Reloc::PIC_, llvm::None, llvm::CodeGenOpt::Aggressive);
// set data layout
if(layout.empty())
module->setDataLayout(machine->createDataLayout());
else
module->setDataLayout(layout);
// emit machine code
for (llvm::Function &f : module->functions())
f.addFnAttr(llvm::Attribute::AlwaysInline);
llvm::legacy::PassManager pass;
llvm::raw_svector_ostream stream(buffer);
// convert triton file type to llvm file type
auto ll_file_type = [&](module::file_type_t type){
if(type == Object)
return llvm::CodeGenFileType::CGFT_ObjectFile;
return llvm::CodeGenFileType::CGFT_AssemblyFile;
};
// emit
machine->addPassesToEmitFile(pass, stream, nullptr, ll_file_type(ft));
pass.run(*module);
}
/* ------------------------ */
// Host //
/* ------------------------ */
host_module::host_module(std::unique_ptr<llvm::Module> src): module(host_module_t(), true) {
init_llvm();
// create kernel wrapper
llvm::LLVMContext &ctx = src->getContext();
llvm::Type *void_ty = llvm::Type::getVoidTy(ctx);
llvm::Type *args_ty = llvm::Type::getInt8PtrTy(ctx)->getPointerTo();
llvm::Type *int32_ty = llvm::Type::getInt32Ty(ctx);
std::vector<llvm::Type*> tys = {args_ty, int32_ty, int32_ty, int32_ty};
llvm::FunctionType *main_ty = llvm::FunctionType::get(void_ty, tys, false);
llvm::Function* main = llvm::Function::Create(main_ty, llvm::Function::ExternalLinkage, "_main", &*src);
llvm::Function* fn = &*src->getFunctionList().begin();
llvm::FunctionType *fn_ty = fn->getFunctionType();
std::vector<llvm::Value*> fn_args(fn_ty->getNumParams());
std::vector<llvm::Value*> ptrs(fn_args.size() - 3);
llvm::BasicBlock* entry = llvm::BasicBlock::Create(ctx, "entry", main);
llvm::IRBuilder<> ir_builder(ctx);
ir_builder.SetInsertPoint(entry);
auto get_size = [](llvm::Type* ty) { return ty->isPointerTy() ? sizeof(char*) : ty->getPrimitiveSizeInBits() / 8; };
llvm::Value* base = main->arg_begin();
llvm::Value* args_base = ir_builder.CreateBitCast(base, base->getType()->getPointerElementType());
size_t offset = 0;
for(unsigned i = 0; i < ptrs.size(); i++){
ptrs[i] = ir_builder.CreateGEP(args_base, ir_builder.getInt32(offset));
size_t nbytes = get_size(fn_ty->getParamType(i));
offset += nbytes;
if(i < ptrs.size() - 1){
size_t np1bytes = get_size(fn_ty->getParamType(i+1));
offset = (offset + np1bytes - 1) / np1bytes * np1bytes;
}
}
for(unsigned i = 0; i < ptrs.size(); i++)
ptrs[i] = ir_builder.CreateBitCast(ptrs[i], fn_ty->getParamType(i)->getPointerTo());
for(unsigned i = 0; i < ptrs.size(); i++)
fn_args[i] = ir_builder.CreateLoad(ptrs[i]);
fn_args[fn_args.size() - 3] = main->arg_begin() + 1;
fn_args[fn_args.size() - 2] = main->arg_begin() + 2;
fn_args[fn_args.size() - 1] = main->arg_begin() + 3;
ir_builder.CreateCall(fn, fn_args);
ir_builder.CreateRetVoid();
// llvm::legacy::PassManager pm;
// pm.add(llvm::createPrintModulePass(llvm::outs()));
// pm.add(llvm::createVerifierPass());
// pm.run(*src);
// create execution engine
for(llvm::Function& fn: src->functions())
hst_->functions[fn.getName().str()] = &fn;
// llvm::orc::JITTargetMachineBuilder JTMB = *llvm::orc::JITTargetMachineBuilder::detectHost();
// auto DL = JTMB.getDefaultDataLayoutForTarget();
// auto CIRC = std::unique_ptr<llvm::orc::ConcurrentIRCompiler>(new llvm::orc::ConcurrentIRCompiler(JTMB));
// hst_->ES = new llvm::orc::ExecutionSession();
// hst_->ObjectLayer = new llvm::orc::RTDyldObjectLinkingLayer(*hst_->ES, []() { return std::unique_ptr<llvm::SectionMemoryManager>(new llvm::SectionMemoryManager()); });
// hst_->CompileLayer = new llvm::orc::IRCompileLayer(*hst_->ES, *hst_->ObjectLayer, *CIRC);
// hst_->DL = new llvm::DataLayout(std::move(*DL));
// hst_->Mangle = new llvm::orc::MangleAndInterner(*hst_->ES, *hst_->DL);
// hst_->Ctx = new llvm::orc::ThreadSafeContext(std::unique_ptr<llvm::LLVMContext>(new llvm::LLVMContext()));
// hst_->MainJD = &hst_->ES->createJITDylib("<main>");
// hst_->MainJD->setGenerator(llvm::cantFail(llvm::orc::DynamicLibrarySearchGenerator::GetForCurrentProcess(
// hst_->DL->getGlobalPrefix())));
// llvm::cantFail(hst_->CompileLayer->add(*hst_->MainJD, llvm::orc::ThreadSafeModule(std::move(src), *hst_->Ctx)));
// hst_->fn = (void(*)(char**, int32_t, int32_t, int32_t))(hst_->ES->lookup({hst_->MainJD}, (*hst_->Mangle)("_main"))->getAddress());
llvm::EngineBuilder builder(std::move(src));
builder.setErrorStr(&hst_->error);
builder.setMCJITMemoryManager(std::make_unique<llvm::SectionMemoryManager>());
builder.setOptLevel(llvm::CodeGenOpt::Aggressive);
builder.setEngineKind(llvm::EngineKind::JIT);
hst_->engine = builder.create();
hst_->fn = (void(*)(char**, int32_t, int32_t, int32_t))(hst_->engine->getFunctionAddress("_main"));
}
std::unique_ptr<buffer> host_module::symbol(const char *name) const {
throw std::runtime_error("not implemented");
}
/* ------------------------ */
// CUDA //
/* ------------------------ */
static bool find_and_replace(std::string& str, const std::string& begin, const std::string& end, const std::string& target){
size_t start_replace = str.find(begin);
size_t end_replace = str.find(end, start_replace);
if(start_replace == std::string::npos)
return false;
str.replace(start_replace, end_replace + 1 - start_replace, target);
return true;
}
static std::map<int, int> vptx = {
{10000, 63},
{10010, 64},
{10020, 65},
{11000, 70},
{11010, 71},
{11020, 72}
};
std::string cu_module::compile_llvm_module(std::unique_ptr<llvm::Module> module, driver::device* device) {
// LLVM version in use may not officially support target hardware
int max_nvvm_cc = 75;
int max_nvvm_ptx = 64;
// options
auto options = llvm::cl::getRegisteredOptions();
auto* short_ptr = static_cast<llvm::cl::opt<bool>*>(options["nvptx-short-ptr"]);
assert(short_ptr);
short_ptr->setValue(true);
// compute capability
int cc = ((driver::cu_device*)device)->compute_capability();
std::string sm = "sm_" + std::to_string(cc);
// driver version
int version;
dispatch::cuDriverGetVersion(&version);
int major = version / 1000;
int minor = (version - major*1000) / 10;
if(major < 10)
throw std::runtime_error("Triton requires CUDA 10+");
// PTX version
int ptx = vptx.at(version);
int ptx_major = ptx / 10;
int ptx_minor = ptx % 10;
// create
llvm::SmallVector<char, 0> buffer;
module::compile_llvm_module(std::move(module), "nvptx64-nvidia-cuda", "sm_" + std::to_string(std::min(cc, max_nvvm_cc)), "", buffer, "+ptx" + std::to_string(std::min(ptx, max_nvvm_ptx)), Assembly);
std::string result(buffer.begin(), buffer.end());
find_and_replace(result, ".version", "\n", ".version " + std::to_string(ptx_major) + "." + std::to_string(ptx_minor) + "\n");
find_and_replace(result, ".target", "\n", ".target " + sm + "\n");
while(find_and_replace(result, "\t// begin inline asm", "\n", ""));
while(find_and_replace(result, "\t// end inline asm", "\n", ""));
return result;
}
cu_module::cu_module(driver::device* device, std::unique_ptr<llvm::Module> ll_module): cu_module(device, compile_llvm_module(std::move(ll_module), device)) { }
cu_module::cu_module(driver::device* device, std::string const & source) : module(CUmodule(), true), ptx_(source){
// JIT compile source-code
try{
// // compile ptx with ptxas
// char _fsrc[] = "/tmp/triton_k_XXXXXX";
// char _flog[] = "/tmp/triton_l_XXXXXX";
// int fdsrc = mkstemp(_fsrc);
// int fdlog = mkstemp(_flog);
// std::string fsrc = _fsrc;
// std::string flog = _flog;
// std::ofstream ofs(fsrc);
// ofs << source;
// ofs.close();
// std::string cmd;
// int err;
// driver::cu_device* cu_device = (driver::cu_device*)device;
// cmd = "ptxas -v --gpu-name=sm_" + std::to_string(cu_device->compute_capability()) + " " + fsrc + " -o " + fsrc + ".o 2> " + flog;
// err = system(cmd.c_str());
// dispatch::cuModuleLoad(&*cu_, (fsrc + ".o").c_str());
// std::ifstream file(flog);
// std::string log;
// if(file)
// while (!file.eof()) log.push_back(file.get());
// unlink(_fsrc);
// unlink(_flog);
// std::smatch match;
// std::regex expr ("\\b([0-9]+) bytes spill");
// spilled_ = 0;
// while (std::regex_search (log,match,expr)){
// spilled_ += std::stoi(match[1]);
// log = match.suffix();
// }
// std::cout << log << std::endl;
CUjit_option opt[] = {CU_JIT_ERROR_LOG_BUFFER_SIZE_BYTES, CU_JIT_ERROR_LOG_BUFFER,
CU_JIT_INFO_LOG_BUFFER_SIZE_BYTES, CU_JIT_INFO_LOG_BUFFER,
CU_JIT_LOG_VERBOSE};
unsigned int errbufsize = 8192;
unsigned int logbufsize = 8192;
char _err[errbufsize];
char _log[logbufsize];
void* optval[] = {(void*)(uintptr_t)errbufsize, (void*)_err, (void*)(uintptr_t)logbufsize, (void*)_log, (void*)1};
dispatch::cuModuleLoadDataEx(&*cu_, ptx_.data(), 5, opt, optval);
std::string err(_err);
std::string log(_log);
// std::cout << log << std::endl;
std::smatch match;
std::regex expr ("\\b([0-9]+) bytes spill");
spilled_ = 0;
while (std::regex_search(log,match,expr)){
spilled_ += std::stoi(match[1]);
log = match.suffix();
}
}
catch(exception::cuda::invalid_ptx const &){
//#ifdef TRITON_LOG_PTX_ERROR
std::cout << source << std::endl;
std::cerr << "It appears that Triton produced invalid PTX code:" << std::endl;
// exit(1);
//#endif
throw;
}
}
std::unique_ptr<buffer> cu_module::symbol(const char *name) const{
CUdeviceptr handle;
size_t size;
dispatch::cuModuleGetGlobal_v2(&handle, &size, *cu_, name);
std::unique_ptr<buffer> res(new cu_buffer(size, handle, false));
return std::move(res);
}
}
}
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