1 // Copyright (c) 2017-2022, Lawrence Livermore National Security, LLC and other CEED contributors. 2 // All Rights Reserved. See the top-level LICENSE and NOTICE files for details. 3 // 4 // SPDX-License-Identifier: BSD-2-Clause 5 // 6 // This file is part of CEED: http://github.com/ceed 7 8 #include <ceed.h> 9 #include <ceed/backend.h> 10 #include <ceed/jit-tools.h> 11 #include <string.h> 12 13 #include <iostream> 14 #include <sstream> 15 16 #include "../cuda/ceed-cuda-compile.h" 17 #include "ceed-cuda-ref.h" 18 19 //------------------------------------------------------------------------------ 20 // Build QFunction kernel 21 //------------------------------------------------------------------------------ 22 extern "C" int CeedQFunctionBuildKernel_Cuda_ref(CeedQFunction qf) { 23 using std::ostringstream; 24 using std::string; 25 26 Ceed ceed; 27 char *read_write_kernel_path, *read_write_kernel_source; 28 CeedInt num_input_fields, num_output_fields, size; 29 CeedQFunctionField *input_fields, *output_fields; 30 CeedQFunction_Cuda *data; 31 32 CeedQFunctionGetCeed(qf, &ceed); 33 CeedCallBackend(CeedQFunctionGetData(qf, (void **)&data)); 34 35 // QFunction is built 36 if (data->QFunction) return CEED_ERROR_SUCCESS; 37 38 CeedCheck(data->qfunction_source, ceed, CEED_ERROR_BACKEND, "No QFunction source or CUfunction provided."); 39 40 // QFunction kernel generation 41 CeedCallBackend(CeedQFunctionGetFields(qf, &num_input_fields, &input_fields, &num_output_fields, &output_fields)); 42 43 // Build strings for final kernel 44 CeedCallBackend(CeedGetJitAbsolutePath(ceed, "ceed/jit-source/cuda/cuda-ref-qfunction.h", &read_write_kernel_path)); 45 CeedDebug256(ceed, CEED_DEBUG_COLOR_SUCCESS, "----- Loading QFunction Read/Write Kernel Source -----\n"); 46 CeedCallBackend(CeedLoadSourceToBuffer(ceed, read_write_kernel_path, &read_write_kernel_source)); 47 CeedDebug256(ceed, CEED_DEBUG_COLOR_SUCCESS, "----- Loading QFunction Read/Write Kernel Source Complete! -----\n"); 48 string qfunction_source(data->qfunction_source); 49 string qfunction_name(data->qfunction_name); 50 string read_write(read_write_kernel_source); 51 string kernel_name = "CeedKernelCudaRefQFunction_" + qfunction_name; 52 ostringstream code; 53 54 // Defintions 55 code << read_write; 56 code << qfunction_source; 57 code << "\n"; 58 code << "extern \"C\" __global__ void " << kernel_name << "(void *ctx, CeedInt Q, Fields_Cuda fields) {\n"; 59 60 // Inputs 61 code << " // Input fields\n"; 62 for (CeedInt i = 0; i < num_input_fields; i++) { 63 CeedCallBackend(CeedQFunctionFieldGetSize(input_fields[i], &size)); 64 code << " const CeedInt size_input_" << i << " = " << size << ";\n"; 65 code << " CeedScalar input_" << i << "[size_input_" << i << "];\n"; 66 } 67 code << " const CeedScalar* inputs[" << num_input_fields << "];\n"; 68 for (CeedInt i = 0; i < num_input_fields; i++) { 69 code << " inputs[" << i << "] = input_" << i << ";\n"; 70 } 71 code << "\n"; 72 73 // Outputs 74 code << " // Output fields\n"; 75 for (CeedInt i = 0; i < num_output_fields; i++) { 76 CeedCallBackend(CeedQFunctionFieldGetSize(output_fields[i], &size)); 77 code << " const CeedInt size_output_" << i << " = " << size << ";\n"; 78 code << " CeedScalar output_" << i << "[size_output_" << i << "];\n"; 79 } 80 code << " CeedScalar* outputs[" << num_output_fields << "];\n"; 81 for (CeedInt i = 0; i < num_output_fields; i++) { 82 code << " outputs[" << i << "] = output_" << i << ";\n"; 83 } 84 code << "\n"; 85 86 // Loop over quadrature points 87 code << " // Loop over quadrature points\n"; 88 code << " for (CeedInt q = blockIdx.x * blockDim.x + threadIdx.x; q < Q; q += blockDim.x * gridDim.x) {\n"; 89 90 // Load inputs 91 code << " // -- Load inputs\n"; 92 for (CeedInt i = 0; i < num_input_fields; i++) { 93 code << " readQuads<size_input_" << i << ">(q, Q, fields.inputs[" << i << "], input_" << i << ");\n"; 94 } 95 code << "\n"; 96 97 // QFunction 98 code << " // -- Call QFunction\n"; 99 code << " " << qfunction_name << "(ctx, 1, inputs, outputs);\n\n"; 100 101 // Write outputs 102 code << " // -- Write outputs\n"; 103 for (CeedInt i = 0; i < num_output_fields; i++) { 104 code << " writeQuads<size_output_" << i << ">(q, Q, output_" << i << ", fields.outputs[" << i << "]);\n"; 105 } 106 code << " }\n"; 107 code << "}\n"; 108 109 // View kernel for debugging 110 CeedDebug256(ceed, CEED_DEBUG_COLOR_SUCCESS, "Generated QFunction Kernels:\n"); 111 CeedDebug(ceed, code.str().c_str()); 112 113 // Compile kernel 114 CeedCallBackend(CeedCompile_Cuda(ceed, code.str().c_str(), &data->module, 0)); 115 CeedCallBackend(CeedGetKernel_Cuda(ceed, data->module, kernel_name.c_str(), &data->QFunction)); 116 117 // Cleanup 118 CeedCallBackend(CeedFree(&data->qfunction_source)); 119 CeedCallBackend(CeedFree(&read_write_kernel_path)); 120 CeedCallBackend(CeedFree(&read_write_kernel_source)); 121 return CEED_ERROR_SUCCESS; 122 } 123 124 //------------------------------------------------------------------------------ 125