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//                        Kokkos v. 2.0
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#ifndef KOKKOS_ROCMSPACE_HPP
#define KOKKOS_ROCMSPACE_HPP

#include <Kokkos_Core_fwd.hpp>

#if defined( KOKKOS_ENABLE_ROCM )

#include <iosfwd>
#include <typeinfo>
#include <string>

#include <Kokkos_HostSpace.hpp>


/*--------------------------------------------------------------------------*/

namespace Kokkos {
namespace Experimental {
/** \brief  ROCm on-device memory management */

class ROCmSpace {
public:

  //! Tag this class as a kokkos memory space
  typedef ROCmSpace             memory_space ;
  typedef Kokkos::Experimental::ROCm          execution_space ;
  typedef Kokkos::Device<execution_space,memory_space> device_type;

  typedef unsigned int          size_type ;

  /*--------------------------------*/

  ROCmSpace();
  ROCmSpace( ROCmSpace && rhs ) = default ;
  ROCmSpace( const ROCmSpace & rhs ) = default ;
  ROCmSpace & operator = ( ROCmSpace && rhs ) = default ;
  ROCmSpace & operator = ( const ROCmSpace & rhs ) = default ;
  ~ROCmSpace() = default ;

  /**\brief  Allocate untracked memory in the rocm space */
  void * allocate( const size_t arg_alloc_size ) const ;

  /**\brief  Deallocate untracked memory in the rocm space */
  void deallocate( void * const arg_alloc_ptr
                 , const size_t arg_alloc_size ) const ;

  /**\brief Return Name of the MemorySpace */
  static constexpr const char* name() { return m_name; };

  /*--------------------------------*/
  /** \brief  Error reporting for HostSpace attempt to access ROCmSpace */
  static void access_error();
  static void access_error( const void * const );

private:

  int  m_device ; ///< Which ROCm device

  static constexpr const char* m_name = "ROCm";
  friend class Kokkos::Impl::SharedAllocationRecord< Kokkos::Experimental::ROCmSpace , void > ;
};

} // namespace Experimental

namespace Impl {

void * rocm_device_allocate(int);
void * rocm_hostpinned_allocate(int);
void rocm_device_free(void * );

/// \brief Initialize lock array for arbitrary size atomics.
///
/// Arbitrary atomics are implemented using a hash table of locks
/// where the hash value is derived from the address of the
/// object for which an atomic operation is performed.
/// This function initializes the locks to zero (unset).
void init_lock_arrays_rocm_space();

/// \brief Retrieve the pointer to the lock array for arbitrary size atomics.
///
/// Arbitrary atomics are implemented using a hash table of locks
/// where the hash value is derived from the address of the
/// object for which an atomic operation is performed.
/// This function retrieves the lock array pointer.
/// If the array is not yet allocated it will do so.
int* atomic_lock_array_rocm_space_ptr(bool deallocate = false);

/// \brief Retrieve the pointer to the scratch array for team and thread private global memory.
///
/// Team and Thread private scratch allocations in
/// global memory are aquired via locks.
/// This function retrieves the lock array pointer.
/// If the array is not yet allocated it will do so.
int* scratch_lock_array_rocm_space_ptr(bool deallocate = false);

/// \brief Retrieve the pointer to the scratch array for unique identifiers.
///
/// Unique identifiers in the range 0-ROCm::concurrency
/// are provided via locks.
/// This function retrieves the lock array pointer.
/// If the array is not yet allocated it will do so.
int* threadid_lock_array_rocm_space_ptr(bool deallocate = false);
}
} // namespace Kokkos

/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/


namespace Kokkos {
namespace Experimental {
/** \brief  Host memory that is accessible to ROCm execution space
 *          through ROCm's host-pinned memory allocation.
 */
class ROCmHostPinnedSpace {
public:

  //! Tag this class as a kokkos memory space
  /** \brief  Memory is in HostSpace so use the HostSpace::execution_space */
  typedef HostSpace::execution_space  execution_space ;
  typedef ROCmHostPinnedSpace         memory_space ;
  typedef Kokkos::Device<execution_space,memory_space> device_type;
  typedef unsigned int                size_type ;

  /*--------------------------------*/

  ROCmHostPinnedSpace();
  ROCmHostPinnedSpace( ROCmHostPinnedSpace && rhs ) = default ;
  ROCmHostPinnedSpace( const ROCmHostPinnedSpace & rhs ) = default ;
  ROCmHostPinnedSpace & operator = ( ROCmHostPinnedSpace && rhs ) = default ;
  ROCmHostPinnedSpace & operator = ( const ROCmHostPinnedSpace & rhs ) = default ;
  ~ROCmHostPinnedSpace() = default ;

  /**\brief  Allocate untracked memory in the space */
  void * allocate( const size_t arg_alloc_size ) const ;

  /**\brief  Deallocate untracked memory in the space */
  void deallocate( void * const arg_alloc_ptr
                 , const size_t arg_alloc_size ) const ;

  /**\brief Return Name of the MemorySpace */
  static constexpr const char* name() { return m_name; };

private:

  static constexpr const char* m_name = "ROCmHostPinned";

  /*--------------------------------*/
};
} // namespace Experimental
} // namespace Kokkos

/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/

namespace Kokkos {
namespace Impl {

static_assert( Kokkos::Impl::MemorySpaceAccess< Kokkos::Experimental::ROCmSpace , Kokkos::Experimental::ROCmSpace >::assignable , "" );

//----------------------------------------

template<>
struct MemorySpaceAccess< Kokkos::HostSpace , Kokkos::Experimental::ROCmSpace > {
  enum { assignable = false };
  enum { accessible = false };
  enum { deepcopy   = true };
};

template<>
struct MemorySpaceAccess< Kokkos::HostSpace , Kokkos::Experimental::ROCmHostPinnedSpace > {
  // HostSpace::execution_space == ROCmHostPinnedSpace::execution_space
  enum { assignable = true };
  enum { accessible = true };
  enum { deepcopy   = true };
};

//----------------------------------------

template<>
struct MemorySpaceAccess< Kokkos::Experimental::ROCmSpace , Kokkos::HostSpace > {
  enum { assignable = false };
  enum { accessible = false };
  enum { deepcopy   = true };
};

template<>
struct MemorySpaceAccess< Kokkos::Experimental::ROCmSpace , Kokkos::Experimental::ROCmHostPinnedSpace > {
  // ROCmSpace::execution_space != ROCmHostPinnedSpace::execution_space
  enum { assignable = false };
  enum { accessible = true }; // ROCmSpace::execution_space
  enum { deepcopy   = true };
};


//----------------------------------------
// ROCmHostPinnedSpace::execution_space == HostSpace::execution_space
// ROCmHostPinnedSpace accessible to both ROCm and Host

template<>
struct MemorySpaceAccess< Kokkos::Experimental::ROCmHostPinnedSpace , Kokkos::HostSpace > {
  enum { assignable = false }; // Cannot access from ROCm
  enum { accessible = true };  // ROCmHostPinnedSpace::execution_space
  enum { deepcopy   = true };
};

template<>
struct MemorySpaceAccess< Kokkos::Experimental::ROCmHostPinnedSpace , Kokkos::Experimental::ROCmSpace > {
  enum { assignable = false }; // Cannot access from Host
  enum { accessible = false };
  enum { deepcopy   = true };
};

};
//----------------------------------------

} // namespace Kokkos::Impl

/*--------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------*/

namespace Kokkos {
namespace Impl {

hc::completion_future DeepCopyAsyncROCm( void * dst , const void * src , size_t n);

template<> struct DeepCopy< Kokkos::Experimental::ROCmSpace , Kokkos::Experimental::ROCmSpace , Kokkos::Experimental::ROCm>
{
  DeepCopy( void * dst , const void * src , size_t );
  DeepCopy( const Kokkos::Experimental::ROCm & , void * dst , const void * src , size_t );
};

template<> struct DeepCopy< Kokkos::Experimental::ROCmSpace , HostSpace , Kokkos::Experimental::ROCm >
{
  DeepCopy( void * dst , const void * src , size_t );
  DeepCopy( const Kokkos::Experimental::ROCm & , void * dst , const void * src , size_t );
};

template<> struct DeepCopy< HostSpace , Kokkos::Experimental::ROCmSpace , Kokkos::Experimental::ROCm >
{
  DeepCopy( void * dst , const void * src , size_t );
  DeepCopy( const Kokkos::Experimental::ROCm & , void * dst , const void * src , size_t );
};

template<class ExecutionSpace> struct DeepCopy< Kokkos::Experimental::ROCmSpace , Kokkos::Experimental::ROCmSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< Kokkos::Experimental::ROCmSpace , Kokkos::Experimental::ROCmSpace , Kokkos::Experimental::ROCm >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    hc::completion_future fut = DeepCopyAsyncROCm (dst,src,n);
    fut.wait();
//    DeepCopy (dst,src,n);
  }
};

template<class ExecutionSpace> struct DeepCopy< Kokkos::Experimental::ROCmSpace , HostSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< Kokkos::Experimental::ROCmSpace , HostSpace , Kokkos::Experimental::ROCm>( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopy (dst,src,n);
  }
};

template<class ExecutionSpace>
struct DeepCopy< HostSpace , Kokkos::Experimental::ROCmSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< HostSpace , Kokkos::Experimental::ROCmSpace , Kokkos::Experimental::ROCm >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopy (dst,src,n);
  }
};

template<> struct DeepCopy< Kokkos::Experimental::ROCmHostPinnedSpace , Kokkos::Experimental::ROCmHostPinnedSpace , Kokkos::Experimental::ROCm>
{
  DeepCopy( void * dst , const void * src , size_t );
  DeepCopy( const Kokkos::Experimental::ROCm & , void * dst , const void * src , size_t );
};

template<> struct DeepCopy< Kokkos::Experimental::ROCmHostPinnedSpace , HostSpace , Kokkos::Experimental::ROCm >
{
  DeepCopy( void * dst , const void * src , size_t );
  DeepCopy( const Kokkos::Experimental::ROCm & , void * dst , const void * src , size_t );
};

template<> struct DeepCopy< HostSpace , Kokkos::Experimental::ROCmHostPinnedSpace , Kokkos::Experimental::ROCm >
{
  DeepCopy( void * dst , const void * src , size_t );
  DeepCopy( const Kokkos::Experimental::ROCm & , void * dst , const void * src , size_t );
};

template<class ExecutionSpace>
struct DeepCopy< Kokkos::Experimental::ROCmSpace , Kokkos::Experimental::ROCmHostPinnedSpace , ExecutionSpace>
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< Kokkos::Experimental::ROCmSpace , HostSpace , Kokkos::Experimental::ROCm >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    hc::completion_future fut = DeepCopyAsyncROCm (dst,src,n);
    fut.wait();
//    DeepCopyROCm (dst,src,n);
  }
};

template<class ExecutionSpace> struct DeepCopy< Kokkos::Experimental::ROCmHostPinnedSpace , Kokkos::Experimental::ROCmSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< HostSpace , Kokkos::Experimental::ROCmSpace , Kokkos::Experimental::ROCm >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    hc::completion_future fut = DeepCopyAsyncROCm (dst,src,n);
    fut.wait();
//    DeepCopyROCm (dst,src,n);
  }
};



template<class ExecutionSpace> struct DeepCopy< Kokkos::Experimental::ROCmHostPinnedSpace , Kokkos::Experimental::ROCmHostPinnedSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< Kokkos::Experimental::ROCmHostPinnedSpace , Kokkos::Experimental::ROCmHostPinnedSpace , Kokkos::Experimental::ROCm >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
//    hc::completion_future fut = DeepCopyAsyncROCm (dst,src,n);
//    fut.wait();
//    DeepCopyAsyncROCm (dst,src,n);
    DeepCopy (dst,src,n);
  }
};

template<class ExecutionSpace> struct DeepCopy< Kokkos::Experimental::ROCmHostPinnedSpace , HostSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< Kokkos::Experimental::ROCmHostPinnedSpace , HostSpace , Kokkos::Experimental::ROCm>( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopy (dst,src,n);
  }
};

template<class ExecutionSpace>
struct DeepCopy< HostSpace , Kokkos::Experimental::ROCmHostPinnedSpace , ExecutionSpace >
{
  inline
  DeepCopy( void * dst , const void * src , size_t n )
  { (void) DeepCopy< HostSpace , Kokkos::Experimental::ROCmHostPinnedSpace , Kokkos::Experimental::ROCm >( dst , src , n ); }

  inline
  DeepCopy( const ExecutionSpace& exec, void * dst , const void * src , size_t n )
  {
    exec.fence();
    DeepCopy (dst,src,n);
  }
};
} // namespace Impl
} // namespace Kokkos

//----------------------------------------------------------------------------
//----------------------------------------------------------------------------

namespace Kokkos {
namespace Impl {

/** Running in ROCmSpace attempting to access HostSpace: error */
template<>
struct VerifyExecutionCanAccessMemorySpace< Kokkos::Experimental::ROCmSpace , Kokkos::HostSpace >
{
  enum { value = false };
  KOKKOS_INLINE_FUNCTION static void verify( void )
    { Kokkos::abort("ROCm code attempted to access HostSpace memory"); }

  KOKKOS_INLINE_FUNCTION static void verify( const void * )
    { Kokkos::abort("ROCm code attempted to access HostSpace memory"); }
};

/** Running in ROCmSpace accessing ROCmHostPinnedSpace: ok */
template<>
struct VerifyExecutionCanAccessMemorySpace< Kokkos::Experimental::ROCmSpace , Kokkos::Experimental::ROCmHostPinnedSpace >
{
  enum { value = true };
  KOKKOS_INLINE_FUNCTION static void verify( void ) { }
  KOKKOS_INLINE_FUNCTION static void verify( const void * ) { }
};

/** Running in ROCmSpace attempting to access an unknown space: error */
template< class OtherSpace >
struct VerifyExecutionCanAccessMemorySpace<
  typename enable_if< ! is_same<Kokkos::Experimental::ROCmSpace,OtherSpace>::value , Kokkos::Experimental::ROCmSpace >::type ,
  OtherSpace >
{
  enum { value = false };
  KOKKOS_INLINE_FUNCTION static void verify( void )
    { Kokkos::abort("ROCm code attempted to access unknown Space memory"); }

  KOKKOS_INLINE_FUNCTION static void verify( const void * )
    { Kokkos::abort("ROCm code attempted to access unknown Space memory"); }
};

//----------------------------------------------------------------------------
/** Running in HostSpace attempting to access ROCmSpace */
template<>
struct VerifyExecutionCanAccessMemorySpace< Kokkos::HostSpace , Kokkos::Experimental::ROCmSpace >
{
  enum { value = false };
  inline static void verify( void ) { Kokkos::Experimental::ROCmSpace::access_error(); }
  inline static void verify( const void * p ) { Kokkos::Experimental::ROCmSpace::access_error(p); }
};

/** Running in HostSpace accessing ROCmHostPinnedSpace is OK */
template<>
struct VerifyExecutionCanAccessMemorySpace< Kokkos::HostSpace , Kokkos::Experimental::ROCmHostPinnedSpace >
{
  enum { value = true };
  KOKKOS_INLINE_FUNCTION static void verify( void ) {}
  KOKKOS_INLINE_FUNCTION static void verify( const void * ) {}
};
} // namespace Impl
} // namespace Kokkos

//----------------------------------------------------------------------------
//----------------------------------------------------------------------------

namespace Kokkos {
namespace Impl {

template<>
class SharedAllocationRecord< Kokkos::Experimental::ROCmSpace , void >
  : public SharedAllocationRecord< void , void >
{
private:


  typedef SharedAllocationRecord< void , void >  RecordBase ;

  SharedAllocationRecord( const SharedAllocationRecord & ) = delete ;
  SharedAllocationRecord & operator = ( const SharedAllocationRecord & ) = delete ;

  static void deallocate( RecordBase * );

  static RecordBase s_root_record ;

  const Kokkos::Experimental::ROCmSpace m_space ;

protected:

  ~SharedAllocationRecord();

  SharedAllocationRecord( const Kokkos::Experimental::ROCmSpace        & arg_space
                        , const std::string              & arg_label
                        , const size_t                     arg_alloc_size
                        , const RecordBase::function_type  arg_dealloc = & deallocate
                        );

public:

  std::string get_label() const ;

  static SharedAllocationRecord * allocate( const Kokkos::Experimental::ROCmSpace &  arg_space
                                          , const std::string       &  arg_label
                                          , const size_t               arg_alloc_size );

  /**\brief  Allocate tracked memory in the space */
  static
  void * allocate_tracked( const Kokkos::Experimental::ROCmSpace & arg_space
                         , const std::string & arg_label
                         , const size_t arg_alloc_size );

  /**\brief  Reallocate tracked memory in the space */
  static
  void * reallocate_tracked( void * const arg_alloc_ptr
                           , const size_t arg_alloc_size );

  /**\brief  Deallocate tracked memory in the space */
  static
  void deallocate_tracked( void * const arg_alloc_ptr );

  static SharedAllocationRecord * get_record( void * arg_alloc_ptr );

  static void print_records( std::ostream & , const Kokkos::Experimental::ROCmSpace & , bool detail = false );
};

template<>
class SharedAllocationRecord< Kokkos::Experimental::ROCmHostPinnedSpace , void >
  : public SharedAllocationRecord< void , void >
{
private:

  typedef SharedAllocationRecord< void , void >  RecordBase ;

  SharedAllocationRecord( const SharedAllocationRecord & ) = delete ;
  SharedAllocationRecord & operator = ( const SharedAllocationRecord & ) = delete ;

  static void deallocate( RecordBase * );

  static RecordBase s_root_record ;

  const Kokkos::Experimental::ROCmHostPinnedSpace m_space ;

protected:

  ~SharedAllocationRecord();
  SharedAllocationRecord() : RecordBase(), m_space() {}

  SharedAllocationRecord( const Kokkos::Experimental::ROCmHostPinnedSpace     & arg_space
                        , const std::string              & arg_label
                        , const size_t                     arg_alloc_size
                        , const RecordBase::function_type  arg_dealloc = & deallocate
                        );

public:

  std::string get_label() const ;

  static SharedAllocationRecord * allocate( const Kokkos::Experimental::ROCmHostPinnedSpace &  arg_space
                                          , const std::string          &  arg_label
                                          , const size_t                  arg_alloc_size
                                          );
  /**\brief  Allocate tracked memory in the space */
  static
  void * allocate_tracked( const Kokkos::Experimental::ROCmHostPinnedSpace & arg_space
                         , const std::string & arg_label
                         , const size_t arg_alloc_size );

  /**\brief  Reallocate tracked memory in the space */
  static
  void * reallocate_tracked( void * const arg_alloc_ptr
                           , const size_t arg_alloc_size );

  /**\brief  Deallocate tracked memory in the space */
  static
  void deallocate_tracked( void * const arg_alloc_ptr );


  static SharedAllocationRecord * get_record( void * arg_alloc_ptr );

  static void print_records( std::ostream & , const Kokkos::Experimental::ROCmHostPinnedSpace & , bool detail = false );
};
} // namespace Impl
} // namespace Kokkos

//----------------------------------------------------------------------------
//----------------------------------------------------------------------------

#endif /* #if defined( KOKKOS_ENABLE_ROCM ) */
#endif /* #define KOKKOS_ROCMSPACE_HPP */

