kernel_program_cache.hpp

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//==--- kernel_program_cache.hpp - Cache for kernel and program -*- C++-*---==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#pragma once
 
#include <CL/sycl/detail/common.hpp>
#include <CL/sycl/detail/locked.hpp>
#include <CL/sycl/detail/os_util.hpp>
#include <CL/sycl/detail/pi.hpp>
#include <CL/sycl/detail/util.hpp>
#include <detail/platform_impl.hpp>
 
#include <atomic>
#include <condition_variable>
#include <map>
#include <mutex>
#include <type_traits>
 
// For testing purposes
class MockKernelProgramCache;
 
__SYCL_INLINE_NAMESPACE(cl) {
namespace sycl {
namespace detail {
class context_impl;
class KernelProgramCache {
public:
  struct BuildError {
    std::string Msg;
    pi_int32 Code;
 
    bool isFilledIn() const {
      return !Msg.empty();
    }
  };
 
  template <typename T> struct BuildResult {
    std::atomic<T *> Ptr;
    std::atomic<int> State;
    BuildError Error;
 
    std::condition_variable MBuildCV;
    std::mutex MBuildResultMutex;
 
    BuildResult(T* P, int S) : Ptr{P}, State{S}, Error{"", 0} {}
  };
 
  using PiProgramT = std::remove_pointer<RT::PiProgram>::type;
  using PiProgramPtrT = std::atomic<PiProgramT *>;
  using ProgramWithBuildStateT = BuildResult<PiProgramT>;
  using ProgramCacheKeyT = std::pair<std::pair<SerializedObj, KernelSetId>,
                                     std::pair<RT::PiDevice, std::string>>;
  using ProgramCacheT = std::map<ProgramCacheKeyT, ProgramWithBuildStateT>;
  using ContextPtr = context_impl *;
 
  using PiKernelT = std::remove_pointer<RT::PiKernel>::type;
 
  using PiKernelPtrT = std::atomic<PiKernelT *>;
  using KernelWithBuildStateT = BuildResult<PiKernelT>;
  using KernelByNameT = std::map<std::string, KernelWithBuildStateT>;
  using KernelCacheT = std::map<RT::PiProgram, KernelByNameT>;
 
  using KernelFastCacheKeyT =
      std::tuple<SerializedObj, OSModuleHandle, RT::PiDevice, std::string,
                 std::string>;
  using KernelFastCacheValT =
      std::tuple<RT::PiKernel, std::mutex *, RT::PiProgram>;
  using KernelFastCacheT = std::map<KernelFastCacheKeyT, KernelFastCacheValT>;
 
  ~KernelProgramCache();
 
  void setContextPtr(const ContextPtr &AContext) { MParentContext = AContext; }
 
  Locked<ProgramCacheT> acquireCachedPrograms() {
    return {MCachedPrograms, MProgramCacheMutex};
  }
 
  Locked<KernelCacheT> acquireKernelsPerProgramCache() {
    return {MKernelsPerProgramCache, MKernelsPerProgramCacheMutex};
  }
 
  template <typename T, class Predicate>
  void waitUntilBuilt(BuildResult<T> &BR, Predicate Pred) const {
    std::unique_lock<std::mutex> Lock(BR.MBuildResultMutex);
 
    BR.MBuildCV.wait(Lock, Pred);
  }
 
  template <typename T> void notifyAllBuild(BuildResult<T> &BR) const {
    BR.MBuildCV.notify_all();
  }
 
  template <typename KeyT>
  KernelFastCacheValT tryToGetKernelFast(KeyT &&CacheKey) {
    std::unique_lock<std::mutex> Lock(MKernelFastCacheMutex);
    auto It = MKernelFastCache.find(CacheKey);
    if (It != MKernelFastCache.end()) {
      return It->second;
    }
    return std::make_tuple(nullptr, nullptr, nullptr);
  }
 
  template <typename KeyT, typename ValT>
  void saveKernel(KeyT &&CacheKey, ValT &&CacheVal) {
    std::unique_lock<std::mutex> Lock(MKernelFastCacheMutex);
    // if no insertion took place, thus some other thread has already inserted
    // smth in the cache
    MKernelFastCache.emplace(CacheKey, CacheVal);
  }
 
  void reset() {
    MCachedPrograms = ProgramCacheT{};
    MKernelsPerProgramCache = KernelCacheT{};
    MKernelFastCache = KernelFastCacheT{};
  }
 
private:
  std::mutex MProgramCacheMutex;
  std::mutex MKernelsPerProgramCacheMutex;
 
  ProgramCacheT MCachedPrograms;
  KernelCacheT MKernelsPerProgramCache;
  ContextPtr MParentContext;
 
  std::mutex MKernelFastCacheMutex;
  KernelFastCacheT MKernelFastCache;
  friend class ::MockKernelProgramCache;
};
} // namespace detail
} // namespace sycl
} // __SYCL_INLINE_NAMESPACE(cl)