!                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:
!      1. Redistributions of source code must retain the above copyright
!         notice, this list of conditions and the following disclaimer.
!      2. Redistributions in binary form must reproduce the above copyright
!         notice, this list of conditions, and the following disclaimer in the
!         documentation and/or other materials provided with the distribution.
!      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
!    TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
!    PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PSBLAS GROUP OR ITS CONTRIBUTORS
!    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
!    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
!    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
!    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
!    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
!    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
!    POSSIBILITY OF SUCH DAMAGE.
!   
  

subroutine  psb_s_elg_allocate_mnnz(m,n,a,nz) 
  
  use psb_base_mod
#ifdef HAVE_SPGPU
  use elldev_mod
  use psb_vectordev_mod
  use psb_s_elg_mat_mod, psb_protect_name => psb_s_elg_allocate_mnnz
#else 
  use psb_s_elg_mat_mod
#endif
  implicit none 
  integer(psb_ipk_), intent(in) :: m,n
  class(psb_s_elg_sparse_mat), intent(inout) :: a
  integer(psb_ipk_), intent(in), optional :: nz
  Integer(Psb_ipk_) :: err_act, info, nz_,ld
  character(len=20)  :: name='allocate_mnz'
  logical, parameter :: debug=.false.
#ifdef HAVE_SPGPU
  type(elldev_parms) :: gpu_parms
#endif

  call psb_erractionsave(err_act)
  info = psb_success_
  if (m < 0) then 
    info = psb_err_iarg_neg_
    call psb_errpush(info,name,i_err=(/ione,izero,izero,izero,izero/))
    goto 9999
  endif
  if (n < 0) then 
    info = psb_err_iarg_neg_
    call psb_errpush(info,name,i_err=(/2*ione,izero,izero,izero,izero/))
    goto 9999
  endif
  if (present(nz)) then 
    nz_ = (max(nz,ione) + m -1 )/m
  else
    nz_ = (max(7*m,7*n,ione)+m-1)/m
  end if
  if (nz_ < 0) then 
    info = psb_err_iarg_neg_
    call psb_errpush(info,name,i_err=(/3*ione,izero,izero,izero,izero/))
    goto 9999
  endif

#ifdef HAVE_SPGPU
  gpu_parms = FgetEllDeviceParams(m,nz_,nz_*m,n,spgpu_type_float,1)
  ld  = gpu_parms%pitch
  nz_ = gpu_parms%maxRowSize
#else
  ld = m
#endif

  if (info == psb_success_) call psb_realloc(m,a%irn,info)
  if (info == psb_success_) call psb_realloc(m,a%idiag,info)
  if (info == psb_success_) call psb_realloc(ld,nz_,a%ja,info)
  if (info == psb_success_) call psb_realloc(ld,nz_,a%val,info)
  if (info == psb_success_) then 
    a%irn   = 0
    a%idiag = 0
    a%nzt = 0
    call a%set_nrows(m)
    call a%set_ncols(n)
    call a%set_bld()
    call a%set_triangle(.false.)
    call a%set_unit(.false.)
    call a%set_dupl(psb_dupl_def_)
  end if

#ifdef HAVE_SPGPU
  call a%to_gpu(info,nzrm=nz_)
  if (info /= 0) goto 9999
#endif

  call psb_erractionrestore(err_act)
  return

9999 call psb_error_handler(err_act)

  return

end subroutine psb_s_elg_allocate_mnnz