Splitting StandardPreconditioners to make it specializable for GPU

tests/gpuistl/test_preconditioner_factory_gpu.cpp

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+/*
+  Copyright 2025 Equinor ASA
+
+  This file is part of the Open Porous Media project (OPM).
+  OPM is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+  OPM is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+  You should have received a copy of the GNU General Public License
+  along with OPM.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include <boost/test/tools/old/interface.hpp>
+#include <config.h>
+#include <cstddef>
+#include <stdexcept>
+
+#define BOOST_TEST_MODULE TestPreconditionerFactoryGPU
+
+#include <boost/test/unit_test.hpp>
+#include <cuda.h>
+#include <cuda_runtime.h>
+
+#include <opm/simulators/linalg/PreconditionerFactory.hpp>
+#include <opm/simulators/linalg/PreconditionerFactory_impl.hpp>
+
+using Scalar = double;
+constexpr static int Dim = 3;
+using MatrixTypeCPU = Dune::BCRSMatrix<Dune::FieldMatrix<Scalar, Dim, Dim>>;
+// using VectorType = Dune::BlockVector<Dune::FieldVector<Scalar, Dim>>;
+using CommSeq = Dune::Amg::SequentialInformation;
+// using GpuOperator = Dune::MatrixAdapter<MatrixType,
+//                                    VectorType,
+//                                    VectorType>;
+
+using GpuMatrixType = Opm::gpuistl::GpuSparseMatrix<Scalar>;
+using GpuVectorType = Opm::gpuistl::GpuVector<Scalar>;
+using GpuOperatorType = Dune::MatrixAdapter<GpuMatrixType, GpuVectorType, GpuVectorType>;
+using FactoryTypeGpu = Opm::PreconditionerFactory<GpuOperatorType, CommSeq>;
+
+BOOST_AUTO_TEST_CASE(TestMatrixAdapter)
+{
+    const std::size_t N = 10;
+    const std::size_t nonZeroes = N * 3 - 2;
+    MatrixTypeCPU matrix(N, N, nonZeroes, MatrixTypeCPU::row_wise);
+    for (auto row = matrix.createbegin(); row != matrix.createend(); ++row) {
+        // Add nonzeros for left neighbour, diagonal and right neighbour
+        if (row.index() > 0) {
+            row.insert(row.index() - 1);
+        }
+        row.insert(row.index());
+        if (row.index() < matrix.N() - 1) {
+            row.insert(row.index() + 1);
+        }
+    }
+
+    for (std::size_t i = 0; i < N; ++i) {
+        matrix[i][i] = -2;
+        if (i < int(N) - 1) {
+            matrix[i][i + 1] = 1;
+        }
+
+        if (i > 0) {
+            matrix[i][i - 1] = 1;
+        }
+    }
+    GpuMatrixType gpuMatrix = GpuMatrixType::fromMatrix(matrix);
+    Dune::MatrixAdapter<GpuMatrixType, GpuVectorType, GpuVectorType> gpuOp(gpuMatrix);
+
+    Opm::PropertyTree prm;
+    prm.put(std::string("preconditioner"), std::string("DILU"));
+    auto weightsCalculator = []() { return GpuVectorType(10); };
+
+    // TODO: Once the GPU preconditioners are implemented, we can remove the check throw
+    // and actually test the preconditioner creation.
+    BOOST_CHECK_THROW(FactoryTypeGpu::create(gpuOp, prm, weightsCalculator), std::invalid_argument);
+}