psblas3/cuda/impl/psb_s_cuda_elg_from_gpu.F90

!                Parallel Sparse BLAS   GPU plugin 
!      (C) Copyright 2013
!  
!                         Salvatore Filippone
!                         Alessandro Fanfarillo
!   
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!    modification, are permitted provided that the following conditions
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!         software without specific written permission.
!   
!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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!   
  

subroutine psb_s_cuda_elg_from_gpu(a,info) 
  
  use psb_base_mod
#ifdef HAVE_SPGPU
  use elldev_mod
  use psb_vectordev_mod
  use psb_s_cuda_elg_mat_mod, psb_protect_name => psb_s_cuda_elg_from_gpu
#else 
  use psb_s_cuda_elg_mat_mod
#endif
  implicit none 
  class(psb_s_cuda_elg_sparse_mat), intent(inout) :: a
  integer(psb_ipk_), intent(out)             :: info

  integer(psb_ipk_)  :: m, nzm, n, pitch,maxrowsize

  info = 0

#ifdef HAVE_SPGPU
  if (.not.(c_associated(a%deviceMat))) then 
    call a%free()
    return
  end if
  
  m   = a%get_nrows()
  nzm = psb_size(a%val,2)
  n   = a%get_ncols()
  
  pitch      = getEllDevicePitch(a%deviceMat)
  maxrowsize = getEllDeviceMaxRowSize(a%deviceMat)

  if ((pitch /= psb_size(a%val,1)).or.(maxrowsize /= psb_size(a%val,2))) then 
    call psb_realloc(pitch,maxrowsize,a%val,info)
    if (info == 0) call psb_realloc(pitch,maxrowsize,a%ja,info)
    if (info == 0) call psb_realloc(pitch,a%irn,info)
  end if
  if (info == 0)  info = &
       & readEllDevice(a%deviceMat,a%val,a%ja,pitch,a%irn,a%idiag)
  call a%set_sync()
#endif

end subroutine psb_s_cuda_elg_from_gpu