// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// SPDX-FileCopyrightText: Copyright Contributors to the Kokkos project

#ifndef KOKKOS_IMPL_PUBLIC_INCLUDE
#define KOKKOS_IMPL_PUBLIC_INCLUDE
#endif

#include <Kokkos_Macros.hpp>

#include <Kokkos_HostSpace.hpp>
#include <SYCL/Kokkos_SYCL.hpp>
#include <SYCL/Kokkos_SYCL_Space.hpp>
#include <SYCL/Kokkos_SYCL_DeepCopy.hpp>
#include <SYCL/Kokkos_SYCL_Instance.hpp>
#include <impl/Kokkos_Profiling.hpp>

/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
namespace Kokkos {
namespace Impl {

void DeepCopySYCL(void* dst, const void* src, size_t n) {
  Impl::SYCLInternal::default_instance->m_queue.memcpy(dst, src, n);
}

void DeepCopyAsyncSYCL(const Kokkos::SYCL& instance, void* dst, const void* src,
                       size_t n) {
  sycl::queue& q = instance.sycl_queue();
  auto event     = q.memcpy(dst, src, n);
#ifndef KOKKOS_IMPL_SYCL_USE_IN_ORDER_QUEUES
  q.ext_oneapi_submit_barrier(std::vector<sycl::event>{event});
#endif
}

void DeepCopyAsyncSYCL(void* dst, const void* src, size_t n) {
  SYCL exec;
  exec.sycl_queue().memcpy(dst, src, n);
  exec.fence("Kokkos::Impl::DeepCopyAsyncSYCL: fence after memcpy");
}

}  // namespace Impl
}  // namespace Kokkos

/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/
namespace {

std::string_view get_memory_space_name(sycl::usm::alloc allocation_kind) {
  switch (allocation_kind) {
    case sycl::usm::alloc::host: return Kokkos::SYCLHostUSMSpace::name();
    case sycl::usm::alloc::device: return Kokkos::SYCLDeviceUSMSpace::name();
    case sycl::usm::alloc::shared: return Kokkos::SYCLSharedUSMSpace::name();
    default:
      Kokkos::abort("bug: unknown sycl allocation type");
      return "unreachable";
  }
}

}  // namespace

namespace Kokkos {

SYCLDeviceUSMSpace::SYCLDeviceUSMSpace() : m_queue(SYCL().sycl_queue()) {}
SYCLDeviceUSMSpace::SYCLDeviceUSMSpace(sycl::queue queue)
    : m_queue(std::move(queue)) {}

SYCLSharedUSMSpace::SYCLSharedUSMSpace() : m_queue(SYCL().sycl_queue()) {}
SYCLSharedUSMSpace::SYCLSharedUSMSpace(sycl::queue queue)
    : m_queue(std::move(queue)) {}

SYCLHostUSMSpace::SYCLHostUSMSpace() : m_queue(SYCL().sycl_queue()) {}
SYCLHostUSMSpace::SYCLHostUSMSpace(sycl::queue queue)
    : m_queue(std::move(queue)) {}

void* allocate_sycl(const char* arg_label, const size_t arg_alloc_size,
                    const size_t arg_logical_size,
                    const Kokkos::Tools::SpaceHandle arg_handle,
                    const sycl::usm::alloc allocation_kind,
                    const sycl::queue& queue) {
  void* const hostPtr = sycl::malloc(arg_alloc_size, queue, allocation_kind);

  if (hostPtr == nullptr) {
    Kokkos::Impl::throw_bad_alloc(get_memory_space_name(allocation_kind),
                                  arg_alloc_size, arg_label);
  }

  if (Kokkos::Profiling::profileLibraryLoaded()) {
    const size_t reported_size =
        (arg_logical_size > 0) ? arg_logical_size : arg_alloc_size;
    Kokkos::Profiling::allocateData(arg_handle, arg_label, hostPtr,
                                    reported_size);
  }

  return hostPtr;
}

void* SYCLDeviceUSMSpace::allocate(const Kokkos::SYCL& exec_space,
                                   const size_t arg_alloc_size) const {
  return allocate(exec_space, "[unlabeled]", arg_alloc_size);
}

void* SYCLDeviceUSMSpace::allocate(const Kokkos::SYCL& exec_space,
                                   const char* arg_label,
                                   const size_t arg_alloc_size,
                                   const size_t arg_logical_size) const {
  return allocate_sycl(arg_label, arg_alloc_size, arg_logical_size,
                       Kokkos::Tools::make_space_handle(name()),
                       sycl::usm::alloc::device, exec_space.sycl_queue());
}

void* SYCLDeviceUSMSpace::allocate(const size_t arg_alloc_size) const {
  return allocate("[unlabeled]", arg_alloc_size);
}

void* SYCLDeviceUSMSpace::allocate(const char* arg_label,
                                   const size_t arg_alloc_size,
                                   const size_t arg_logical_size) const {
  return allocate_sycl(arg_label, arg_alloc_size, arg_logical_size,
                       Kokkos::Tools::make_space_handle(name()),
                       sycl::usm::alloc::device, m_queue);
}

void* SYCLSharedUSMSpace::allocate(const SYCL& exec_space,
                                   const size_t arg_alloc_size) const {
  return allocate(exec_space, "[unlabeled]", arg_alloc_size);
}
void* SYCLSharedUSMSpace::allocate(const SYCL& exec_space,
                                   const char* arg_label,
                                   const size_t arg_alloc_size,
                                   const size_t arg_logical_size) const {
  return allocate_sycl(arg_label, arg_alloc_size, arg_logical_size,
                       Kokkos::Tools::make_space_handle(name()),
                       sycl::usm::alloc::shared, exec_space.sycl_queue());
}

void* SYCLSharedUSMSpace::allocate(const size_t arg_alloc_size) const {
  return allocate("[unlabeled]", arg_alloc_size);
}
void* SYCLSharedUSMSpace::allocate(const char* arg_label,
                                   const size_t arg_alloc_size,
                                   const size_t arg_logical_size) const {
  return allocate_sycl(arg_label, arg_alloc_size, arg_logical_size,
                       Kokkos::Tools::make_space_handle(name()),
                       sycl::usm::alloc::shared, m_queue);
}

void* SYCLHostUSMSpace::allocate(const SYCL& exec_space,
                                 const size_t arg_alloc_size) const {
  return allocate(exec_space, "[unlabeled]", arg_alloc_size);
}
void* SYCLHostUSMSpace::allocate(const SYCL& exec_space, const char* arg_label,
                                 const size_t arg_alloc_size,
                                 const size_t arg_logical_size) const {
  return allocate_sycl(arg_label, arg_alloc_size, arg_logical_size,
                       Kokkos::Tools::make_space_handle(name()),
                       sycl::usm::alloc::host, exec_space.sycl_queue());
}

void* SYCLHostUSMSpace::allocate(const size_t arg_alloc_size) const {
  return allocate("[unlabeled]", arg_alloc_size);
}
void* SYCLHostUSMSpace::allocate(const char* arg_label,
                                 const size_t arg_alloc_size,
                                 const size_t arg_logical_size) const {
  return allocate_sycl(arg_label, arg_alloc_size, arg_logical_size,
                       Kokkos::Tools::make_space_handle(name()),
                       sycl::usm::alloc::host, m_queue);
}

void sycl_deallocate(const char* arg_label, void* const arg_alloc_ptr,
                     const size_t arg_alloc_size, const size_t arg_logical_size,
                     const Kokkos::Tools::SpaceHandle arg_handle,
                     const sycl::queue& queue) {
  if (Kokkos::Profiling::profileLibraryLoaded()) {
    const size_t reported_size =
        (arg_logical_size > 0) ? arg_logical_size : arg_alloc_size;
    Kokkos::Profiling::deallocateData(arg_handle, arg_label, arg_alloc_ptr,
                                      reported_size);
  }

  SYCL::impl_static_fence(
      "Kokkos::Impl::sycl_deallocate: fence before deallocate");
  sycl::free(arg_alloc_ptr, queue);
}

void SYCLDeviceUSMSpace::deallocate(void* const arg_alloc_ptr,
                                    const size_t arg_alloc_size) const {
  deallocate("[unlabeled]", arg_alloc_ptr, arg_alloc_size);
}
void SYCLDeviceUSMSpace::deallocate(const char* arg_label,
                                    void* const arg_alloc_ptr,
                                    const size_t arg_alloc_size,
                                    const size_t arg_logical_size) const {
  sycl_deallocate(arg_label, arg_alloc_ptr, arg_alloc_size, arg_logical_size,
                  Kokkos::Tools::make_space_handle(name()), m_queue);
}

void SYCLSharedUSMSpace::deallocate(void* const arg_alloc_ptr,
                                    const size_t arg_alloc_size) const {
  deallocate("[unlabeled]", arg_alloc_ptr, arg_alloc_size);
}

void SYCLSharedUSMSpace::deallocate(const char* arg_label,
                                    void* const arg_alloc_ptr,
                                    const size_t arg_alloc_size,
                                    const size_t arg_logical_size) const {
  sycl_deallocate(arg_label, arg_alloc_ptr, arg_alloc_size, arg_logical_size,
                  Kokkos::Tools::make_space_handle(name()), m_queue);
}

void SYCLHostUSMSpace::deallocate(void* const arg_alloc_ptr,
                                  const size_t arg_alloc_size) const {
  deallocate("[unlabeled]", arg_alloc_ptr, arg_alloc_size);
}

void SYCLHostUSMSpace::deallocate(const char* arg_label,
                                  void* const arg_alloc_ptr,
                                  const size_t arg_alloc_size,
                                  const size_t arg_logical_size) const {
  sycl_deallocate(arg_label, arg_alloc_ptr, arg_alloc_size, arg_logical_size,
                  Kokkos::Tools::make_space_handle(name()), m_queue);
}

}  // namespace Kokkos

//==============================================================================
// <editor-fold desc="Explicit instantiations of CRTP Base classes"> {{{1

#include <impl/Kokkos_SharedAlloc_timpl.hpp>

KOKKOS_IMPL_HOST_INACCESSIBLE_SHARED_ALLOCATION_RECORD_EXPLICIT_INSTANTIATION(
    Kokkos::SYCLDeviceUSMSpace);
KOKKOS_IMPL_SHARED_ALLOCATION_RECORD_EXPLICIT_INSTANTIATION(
    Kokkos::SYCLSharedUSMSpace);
KOKKOS_IMPL_SHARED_ALLOCATION_RECORD_EXPLICIT_INSTANTIATION(
    Kokkos::SYCLHostUSMSpace);

// </editor-fold> end Explicit instantiations of CRTP Base classes }}}1
//==============================================================================
