1: #include <petscmat.h>

  3: /*@
  4:   MatCreateDenseFromVecType - Create a matrix that matches the type of a Vec.

  6:   Collective

  8:   Input Parameters:
  9: + comm  - the communicator
 10: . vtype - the vector type
 11: . m     - number of local rows (or `PETSC_DECIDE` to have calculated if `M` is given)
 12: . n     - number of local columns (or `PETSC_DECIDE` to have calculated if `N` is given)
 13: . M     - number of global rows (or `PETSC_DECIDE` to have calculated if `m` is given)
 14: . N     - number of global columns (or `PETSC_DECIDE` to have calculated if `n` is given)
 15: . lda   - optional leading dimension. Pass any non-positive number to use the default.
 16: - data  - optional location of matrix data, which should have the same memory type as the vector. Pass `NULL` to have PETSc take care of matrix memory allocation.

 18:   Output Parameter:
 19: . A - the dense matrix

 21:   Level: advanced

 23: .seealso: [](ch_matrices), `Mat`, `MatCreateDense()`, `MatCreateDenseCUDA()`, `MatCreateDenseHIP()`, `PetscMemType`
 24: @*/
 25: PetscErrorCode MatCreateDenseFromVecType(MPI_Comm comm, VecType vtype, PetscInt m, PetscInt n, PetscInt M, PetscInt N, PetscInt lda, PetscScalar *data, Mat *A)
 26: {
 27:   VecType   root_type = VECSTANDARD;
 28:   PetscBool isstd, iscuda, iship, iskokkos;

 30:   PetscFunctionBegin;
 31:   PetscCall(PetscStrcmpAny(vtype, &isstd, VECSTANDARD, VECMPI, VECSEQ, ""));
 32:   PetscCall(PetscStrcmpAny(vtype, &iscuda, VECCUDA, VECMPICUDA, VECSEQCUDA, ""));
 33:   PetscCall(PetscStrcmpAny(vtype, &iship, VECHIP, VECMPIHIP, VECSEQHIP, ""));
 34:   PetscCall(PetscStrcmpAny(vtype, &iskokkos, VECKOKKOS, VECMPIKOKKOS, VECSEQKOKKOS, ""));
 35:   PetscCheck(isstd || iscuda || iship || iskokkos, comm, PETSC_ERR_SUP, "Not for type %s", vtype);
 36:   if (iscuda) root_type = VECCUDA;
 37:   else if (iship) root_type = VECHIP;
 38:   else if (iskokkos) {
 39:     /* We support only one type of kokkos device */
 40:     PetscCheck(!PetscDefined(HAVE_MACRO_KOKKOS_ENABLE_SYCL), comm, PETSC_ERR_SUP, "Not for sycl backend");
 41:     if (PetscDefined(HAVE_MACRO_KOKKOS_ENABLE_CUDA)) iscuda = PETSC_TRUE;
 42:     else if (PetscDefined(HAVE_MACRO_KOKKOS_ENABLE_HIP)) iship = PETSC_TRUE;
 43:     else isstd = PETSC_TRUE;
 44:     root_type = VECKOKKOS;
 45:   }
 46:   PetscCall(MatCreate(comm, A));
 47:   PetscCall(MatSetSizes(*A, m, n, M, N));
 48:   if (isstd) {
 49:     PetscCall(MatSetType(*A, MATDENSE));
 50:     if (lda > 0) PetscCall(MatDenseSetLDA(*A, lda));
 51:     PetscCall(MatSeqDenseSetPreallocation(*A, data));
 52:     PetscCall(MatMPIDenseSetPreallocation(*A, data));
 53:   } else if (iscuda) {
 54:     PetscCheck(PetscDefined(HAVE_CUDA), comm, PETSC_ERR_SUP, "PETSc not compiled with CUDA support");
 55: #if defined(PETSC_HAVE_CUDA)
 56:     PetscCall(MatSetType(*A, MATDENSECUDA));
 57:     if (lda > 0) PetscCall(MatDenseSetLDA(*A, lda));
 58:     PetscCall(MatDenseCUDASetPreallocation(*A, data));
 59: #endif
 60:   } else if (iship) {
 61:     PetscCheck(PetscDefined(HAVE_HIP), comm, PETSC_ERR_SUP, "PETSc not compiled with HIP support");
 62: #if defined(PETSC_HAVE_HIP)
 63:     PetscCall(MatSetType(*A, MATDENSEHIP));
 64:     if (lda > 0) PetscCall(MatDenseSetLDA(*A, lda));
 65:     PetscCall(MatDenseHIPSetPreallocation(*A, data));
 66: #endif
 67:   }
 68:   PetscCall(MatSetVecType(*A, root_type));
 69:   PetscFunctionReturn(PETSC_SUCCESS);
 70: }