gs_device.F90

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module gs_device
  use neko_config
  use num_types
  use gs_bcknd
  use device
  use gs_ops
  use utils
  use, intrinsic :: iso_c_binding, only : c_ptr, c_int, c_null_ptr, &
                                          c_associated
  implicit none
  private
 
  type, public, extends(gs_bcknd_t) :: gs_device_t
     integer, allocatable :: local_blk_off(:)
     integer, allocatable :: shared_blk_off(:)
     type(c_ptr) :: local_gs_d = c_null_ptr      
     type(c_ptr) :: local_dof_gs_d = c_null_ptr  
     type(c_ptr) :: local_gs_dof_d = c_null_ptr  
     type(c_ptr) :: shared_gs_d = c_null_ptr     
     type(c_ptr) :: shared_dof_gs_d = c_null_ptr 
     type(c_ptr) :: shared_gs_dof_d = c_null_ptr 
     type(c_ptr) :: local_blk_len_d = c_null_ptr 
     type(c_ptr) :: shared_blk_len_d = c_null_ptr
     type(c_ptr) :: local_blk_off_d = c_null_ptr 
     type(c_ptr) :: shared_blk_off_d = c_null_ptr
     integer :: nlocal
     integer :: nshared
     logical :: shared_on_host
   contains
     procedure, pass(this) :: init => gs_device_init
     procedure, pass(this) :: free => gs_device_free
     procedure, pass(this) :: gather => gs_gather_device
     procedure, pass(this) :: scatter => gs_scatter_device
  end type gs_device_t
 
#ifdef HAVE_HIP
  interface
     subroutine hip_gather_kernel(v, m, o, dg, u, n, gd, nb, b, bo, op, strm) &
          bind(c, name='hip_gather_kernel')
       use, intrinsic :: iso_c_binding
       implicit none
       integer(c_int) :: m, n, nb, o, op
       type(c_ptr), value :: v, u, dg, gd, b, bo, strm
     end subroutine hip_gather_kernel
  end interface
 
  interface
     subroutine hip_scatter_kernel(v, m, dg, u, n, gd, nb, b, bo, strm) &
          bind(c, name='hip_scatter_kernel')
       use, intrinsic :: iso_c_binding
       implicit none
       integer(c_int) :: m, n, nb
       type(c_ptr), value :: v, u, dg, gd, b, bo, strm
     end subroutine hip_scatter_kernel
  end interface
 
#elif HAVE_CUDA
  interface
     subroutine cuda_gather_kernel(v, m, o, dg, u, n, gd, nb, b, bo, op, strm) &
          bind(c, name='cuda_gather_kernel')
       use, intrinsic :: iso_c_binding
       implicit none
       integer(c_int) :: m, n, nb, o, op
       type(c_ptr), value :: v, u, dg, gd, b, bo, strm
     end subroutine cuda_gather_kernel
  end interface
 
  interface
     subroutine cuda_scatter_kernel(v, m, dg, u, n, gd, nb, b, bo, strm) &
          bind(c, name='cuda_scatter_kernel')
       use, intrinsic :: iso_c_binding
       implicit none
       integer(c_int) :: m, n, nb
       type(c_ptr), value :: v, u, dg, gd, b, bo, strm
     end subroutine cuda_scatter_kernel
  end interface
#elif HAVE_OPENCL
  interface
     subroutine opencl_gather_kernel(v, m, o, dg, u, n, gd, nb, b, bo, op) &
          bind(c, name='opencl_gather_kernel')
       use, intrinsic :: iso_c_binding
       implicit none
       integer(c_int) :: m, n, nb, o, op
       type(c_ptr), value :: v, u, dg, gd, b, bo
     end subroutine opencl_gather_kernel
  end interface
 
  interface
     subroutine opencl_scatter_kernel(v, m, dg, u, n, gd, nb, b, bo) &
          bind(c, name='opencl_scatter_kernel')
       use, intrinsic :: iso_c_binding
       implicit none
       integer(c_int) :: m, n, nb
       type(c_ptr), value :: v, u, dg, gd, b, bo
     end subroutine opencl_scatter_kernel
  end interface
#endif
 
contains
 
  subroutine gs_device_init(this, nlocal, nshared, nlcl_blks, nshrd_blks)
    class(gs_device_t), intent(inout) :: this
    integer, intent(in) :: nlocal
    integer, intent(in) :: nshared
    integer, intent(in) :: nlcl_blks
    integer, intent(in) :: nshrd_blks
 
    call this%free()
 
    this%nlocal = nlocal
    this%nshared = nshared
 
    allocate(this%local_blk_off(nlcl_blks))
    allocate(this%shared_blk_off(nshrd_blks))
 
    this%local_gs_d = c_null_ptr
    this%local_dof_gs_d = c_null_ptr
    this%local_gs_dof_d = c_null_ptr
    this%local_blk_len_d = c_null_ptr
    this%local_blk_off_d = c_null_ptr
    this%shared_gs_d = c_null_ptr
    this%shared_dof_gs_d = c_null_ptr
    this%shared_gs_dof_d = c_null_ptr
    this%shared_blk_len_d = c_null_ptr
    this%shared_blk_off_d = c_null_ptr
 
    this%shared_on_host = .true.
 
    call device_event_create(this%gather_event, 2)
    call device_event_create(this%scatter_event, 2)
 
    this%gs_stream = glb_cmd_queue
 
  end subroutine gs_device_init
 
  subroutine gs_device_free(this)
    class(gs_device_t), intent(inout) :: this
 
    if (allocated(this%local_blk_off)) then
       deallocate(this%local_blk_off)
    end if
 
    if (allocated(this%shared_blk_off)) then
       deallocate(this%shared_blk_off)
    end if
 
    if (c_associated(this%local_gs_d)) then
       call device_free(this%local_gs_d)
    end if
 
    if (c_associated(this%local_dof_gs_d)) then
       call device_free(this%local_dof_gs_d)
    end if
 
    if (c_associated(this%local_gs_dof_d)) then
       call device_free(this%local_gs_dof_d)
    end if
 
    if (c_associated(this%local_blk_len_d)) then
       call device_free(this%local_blk_len_d)
    end if
 
    if (c_associated(this%shared_blk_len_d)) then
       call device_free(this%shared_blk_len_d)
    end if
 
    if (c_associated(this%local_blk_off_d)) then
       call device_free(this%local_blk_off_d)
    end if
 
    if (c_associated(this%shared_blk_off_d)) then
       call device_free(this%shared_blk_off_d)
    end if
 
    this%nlocal = 0
    this%nshared = 0
 
    if (c_associated(this%gather_event)) then
       call device_event_destroy(this%gather_event)
    end if
 
    if (c_associated(this%scatter_event)) then
       call device_event_destroy(this%scatter_event)
    end if
 
    if (c_associated(this%gs_stream)) then
       this%gs_stream = c_null_ptr
    end if
 
  end subroutine gs_device_free
 
  subroutine gs_gather_device(this, v, m, o, dg, u, n, gd, nb, b, op, shrd)
    integer, intent(in) :: m
    integer, intent(in) :: n
    integer, intent(in) :: nb
    class(gs_device_t), intent(inout) :: this
    real(kind=rp), dimension(m), intent(inout) :: v
    integer, dimension(m), intent(inout) :: dg
    real(kind=rp), dimension(n), intent(inout) :: u
    integer, dimension(m), intent(inout) :: gd
    integer, dimension(nb), intent(inout) :: b
    integer, intent(in) :: o
    integer, intent(in) :: op
    logical, intent(in) :: shrd
    integer :: i
    type(c_ptr) :: u_d
 
    u_d = device_get_ptr(u)
 
    if (.not. shrd) then
       associate(v_d=>this%local_gs_d, dg_d=>this%local_dof_gs_d, &
            gd_d=>this%local_gs_dof_d, b_d=>this%local_blk_len_d, &
            bo=>this%local_blk_off, bo_d=>this%local_blk_off_d, &
            strm=>this%gs_stream)
 
         if (.not. c_associated(v_d)) then
            call device_map(v, v_d, m)
         end if
 
         if (.not. c_associated(dg_d)) then
            call device_map(dg, dg_d, m)
            call device_memcpy(dg, dg_d, m, host_to_device, &
                               sync=.false., strm=strm)
         end if
 
         if (.not. c_associated(gd_d)) then
            call device_map(gd, gd_d, m)
            call device_memcpy(gd, gd_d, m, host_to_device, &
                               sync=.false., strm=strm)
         end if
 
         if (.not. c_associated(b_d)) then
            call device_map(b, b_d, nb)
            call device_memcpy(b, b_d, nb, host_to_device, &
                               sync=.false., strm=strm)
         end if
 
         if (.not. c_associated(bo_d)) then
            call device_map(bo, bo_d, nb)
            bo(1) = 0
            do  i = 2, nb
               bo(i) = bo(i - 1) + b(i - 1)
            end do
            call device_memcpy(bo, bo_d, nb, host_to_device, &
                               sync=.false., strm=strm)
         end if
 
#ifdef HAVE_HIP
         call hip_gather_kernel(v_d, m, o, dg_d, u_d, n, gd_d, &
                                nb, b_d, bo_d, op, strm)
#elif HAVE_CUDA
         call cuda_gather_kernel(v_d, m, o, dg_d, u_d, n, gd_d, &
              nb, b_d, bo_d, op, strm)
#elif HAVE_OPENCL
         call opencl_gather_kernel(v_d, m, o, dg_d, u_d, n, gd_d, &
                                   nb, b_d, bo_d, op)
#else
         call neko_error('No device backend configured')
#endif
 
       end associate
    else if (shrd) then
       associate(v_d=>this%shared_gs_d, dg_d=>this%shared_dof_gs_d, &
            gd_d=>this%shared_gs_dof_d, b_d=>this%shared_blk_len_d, &
            bo=>this%shared_blk_off, bo_d=>this%shared_blk_off_d, &
            strm=>this%gs_stream)
 
         if (.not. c_associated(v_d)) then
            call device_map(v, v_d, m)
         end if
 
         if (.not. c_associated(dg_d)) then
            call device_map(dg, dg_d, m)
            call device_memcpy(dg, dg_d, m, host_to_device, &
                               sync=.false., strm=strm)
         end if
 
         if (.not. c_associated(gd_d)) then
            call device_map(gd, gd_d, m)
            call device_memcpy(gd, gd_d, m, host_to_device, &
                               sync=.false., strm=strm)
         end if
 
         if (.not. c_associated(b_d)) then
            call device_map(b, b_d, nb)
            call device_memcpy(b, b_d, nb, host_to_device, &
                               sync=.false., strm=strm)
         end if
 
         if (.not. c_associated(bo_d)) then
            call device_map(bo, bo_d, nb)
            bo(1) = 0
            do  i = 2, nb
               bo(i) = bo(i - 1) + b(i - 1)
            end do
            call device_memcpy(bo, bo_d, nb, host_to_device, &
                               sync=.false., strm=strm)
         end if
 
 
#ifdef HAVE_HIP
         call hip_gather_kernel(v_d, m, o, dg_d, u_d, n, gd_d, &
                                nb, b_d, bo_d, op, strm)
#elif HAVE_CUDA
         call cuda_gather_kernel(v_d, m, o, dg_d, u_d, n, gd_d, &
              nb, b_d, bo_d, op, strm)
#elif HAVE_OPENCL
         call opencl_gather_kernel(v_d, m, o, dg_d, u_d, n, gd_d, &
                                   nb, b_d, bo_d, op)
#else
         call neko_error('No device backend configured')
#endif
 
         call device_event_record(this%gather_event, strm)
 
         if (this%shared_on_host) then
            if (this%nshared .eq. m) then
               call device_memcpy(v, v_d, m, device_to_host, &
                                  sync=.true., strm=strm)
            end if
         end if
 
       end associate
    end if
 
  end subroutine gs_gather_device
 
  subroutine gs_scatter_device(this, v, m, dg, u, n, gd, nb, b, shrd, event)
    integer, intent(in) :: m
    integer, intent(in) :: n
    integer, intent(in) :: nb
    class(gs_device_t), intent(inout) :: this
    real(kind=rp), dimension(m), intent(inout) :: v
    integer, dimension(m), intent(inout) :: dg
    real(kind=rp), dimension(n), intent(inout) :: u
    integer, dimension(m), intent(inout) :: gd
    integer, dimension(nb), intent(inout) :: b
    logical, intent(in) :: shrd
    type(c_ptr) :: event
    type(c_ptr) :: u_d
 
    u_d = device_get_ptr(u)
 
    if (.not. shrd) then
       associate(v_d=>this%local_gs_d, dg_d=>this%local_dof_gs_d, &
            gd_d=>this%local_gs_dof_d, b_d=>this%local_blk_len_d, &
            bo_d=>this%local_blk_off_d, strm=>this%gs_stream)
#ifdef HAVE_HIP
         call hip_scatter_kernel(v_d, m, dg_d, u_d, n, gd_d, nb, b_d, bo_d, strm)
#elif HAVE_CUDA
         call cuda_scatter_kernel(v_d, m, dg_d, u_d, n, gd_d, nb, b_d, bo_d, strm)
#elif HAVE_OPENCL
         call opencl_scatter_kernel(v_d, m, dg_d, u_d, n, gd_d, nb, b_d, bo_d)
#else
         call neko_error('No device backend configured')
#endif
       end associate
    else if (shrd) then
       associate(v_d=>this%shared_gs_d, dg_d=>this%shared_dof_gs_d, &
            gd_d=>this%shared_gs_dof_d, b_d=>this%shared_blk_len_d, &
            bo_d=>this%shared_blk_off_d, strm=>this%gs_stream)
 
         if (this%shared_on_host) then
            call device_memcpy(v, v_d, m, host_to_device, &
                               sync=.false., strm=strm)
         end if
 
#ifdef HAVE_HIP
         call hip_scatter_kernel(v_d, m, dg_d, u_d, n, gd_d, nb, b_d, bo_d, strm)
#elif HAVE_CUDA
         call cuda_scatter_kernel(v_d, m, dg_d, u_d, n, gd_d, nb, b_d, bo_d, strm)
#elif HAVE_OPENCL
         call opencl_scatter_kernel(v_d, m, dg_d, u_d, n, gd_d, nb, b_d, bo_d)
#else
         call neko_error('No device backend configured')
#endif
 
         if (c_associated(event)) then
            call device_event_record(event, strm)
         else
            call device_sync(strm)
         end if
 
       end associate
    end if
 
  end subroutine gs_scatter_device
 
end module gs_device