psblas3/cuda/impl/psb_z_cuda_csrg_from_gpu.F90

!                Parallel Sparse BLAS   GPU plugin 
!      (C) Copyright 2013
!  
!                         Salvatore Filippone
!                         Alessandro Fanfarillo
!   
!    Redistribution and use in source and binary forms, with or without
!    modification, are permitted provided that the following conditions
!    are met:
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!         notice, this list of conditions and the following disclaimer.
!      2. Redistributions in binary form must reproduce the above copyright
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!      3. The name of the PSBLAS group or the names of its contributors may
!         not be used to endorse or promote products derived from this
!         software without specific written permission.
!   
!    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
!    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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!   
  

subroutine psb_z_cuda_csrg_from_gpu(a,info) 
  
  use psb_base_mod
  use elldev_mod
  use psb_vectordev_mod
  use psb_z_cuda_csrg_mat_mod, psb_protect_name => psb_z_cuda_csrg_from_gpu
  implicit none 
  class(psb_z_cuda_csrg_sparse_mat), intent(inout) :: a
  integer(psb_ipk_), intent(out)             :: info

  integer(psb_ipk_)  :: m, n, nz

  info = 0

  if (.not.(c_associated(a%deviceMat%mat))) then 
    call a%free()
    return
  end if

  info = CSRGDeviceGetParms(a%deviceMat,m,n,nz)
  if (info /= psb_success_) return
  
  if (info == 0) call psb_realloc(m+1,a%irp,info)
  if (info == 0) call psb_realloc(nz,a%ja,info)
  if (info == 0) call psb_realloc(nz,a%val,info)
  if (info == 0)  info = &
       & CSRGDevice2Host(a%deviceMat,m,n,nz,a%irp,a%ja,a%val)
#if (CUDA_SHORT_VERSION <= 10) || (CUDA_VERSION <  11030)
  a%irp(:) = a%irp(:)+1
  a%ja(:) = a%ja(:)+1
#endif

  call a%set_sync()

end subroutine psb_z_cuda_csrg_from_gpu