1 // Copyright (c) 2017-2024, 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 const 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 CeedCallBackend(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 { 47 char *source; 48 49 CeedCallBackend(CeedLoadSourceToBuffer(ceed, read_write_kernel_path, &source)); 50 read_write_kernel_source = source; 51 } 52 CeedDebug256(ceed, CEED_DEBUG_COLOR_SUCCESS, "----- Loading QFunction Read/Write Kernel Source Complete! -----\n"); 53 string qfunction_source(data->qfunction_source); 54 string qfunction_name(data->qfunction_name); 55 string read_write(read_write_kernel_source); 56 string kernel_name = "CeedKernelCudaRefQFunction_" + qfunction_name; 57 ostringstream code; 58 59 // Defintions 60 code << read_write; 61 code << qfunction_source; 62 code << "\n"; 63 code << "extern \"C\" __global__ void " << kernel_name << "(void *ctx, CeedInt Q, Fields_Cuda fields) {\n"; 64 65 // Inputs 66 code << " // Input fields\n"; 67 for (CeedInt i = 0; i < num_input_fields; i++) { 68 CeedCallBackend(CeedQFunctionFieldGetSize(input_fields[i], &size)); 69 code << " const CeedInt size_input_" << i << " = " << size << ";\n"; 70 code << " CeedScalar input_" << i << "[size_input_" << i << "];\n"; 71 } 72 code << " const CeedScalar* inputs[" << num_input_fields << "];\n"; 73 for (CeedInt i = 0; i < num_input_fields; i++) { 74 code << " inputs[" << i << "] = input_" << i << ";\n"; 75 } 76 code << "\n"; 77 78 // Outputs 79 code << " // Output fields\n"; 80 for (CeedInt i = 0; i < num_output_fields; i++) { 81 CeedCallBackend(CeedQFunctionFieldGetSize(output_fields[i], &size)); 82 code << " const CeedInt size_output_" << i << " = " << size << ";\n"; 83 code << " CeedScalar output_" << i << "[size_output_" << i << "];\n"; 84 } 85 code << " CeedScalar* outputs[" << num_output_fields << "];\n"; 86 for (CeedInt i = 0; i < num_output_fields; i++) { 87 code << " outputs[" << i << "] = output_" << i << ";\n"; 88 } 89 code << "\n"; 90 91 // Loop over quadrature points 92 code << " // Loop over quadrature points\n"; 93 code << " for (CeedInt q = blockIdx.x * blockDim.x + threadIdx.x; q < Q; q += blockDim.x * gridDim.x) {\n"; 94 95 // Load inputs 96 code << " // -- Load inputs\n"; 97 for (CeedInt i = 0; i < num_input_fields; i++) { 98 code << " readQuads<size_input_" << i << ">(q, Q, fields.inputs[" << i << "], input_" << i << ");\n"; 99 } 100 code << "\n"; 101 102 // QFunction 103 code << " // -- Call QFunction\n"; 104 code << " " << qfunction_name << "(ctx, 1, inputs, outputs);\n\n"; 105 106 // Write outputs 107 code << " // -- Write outputs\n"; 108 for (CeedInt i = 0; i < num_output_fields; i++) { 109 code << " writeQuads<size_output_" << i << ">(q, Q, output_" << i << ", fields.outputs[" << i << "]);\n"; 110 } 111 code << " }\n"; 112 code << "}\n"; 113 114 // View kernel for debugging 115 CeedDebug256(ceed, CEED_DEBUG_COLOR_SUCCESS, "Generated QFunction Kernels:\n"); 116 CeedDebug(ceed, code.str().c_str()); 117 118 // Compile kernel 119 CeedCallBackend(CeedCompile_Cuda(ceed, code.str().c_str(), &data->module, 0)); 120 CeedCallBackend(CeedGetKernel_Cuda(ceed, data->module, kernel_name.c_str(), &data->QFunction)); 121 122 // Cleanup 123 CeedCallBackend(CeedFree(&data->qfunction_source)); 124 CeedCallBackend(CeedFree(&read_write_kernel_path)); 125 CeedCallBackend(CeedFree(&read_write_kernel_source)); 126 return CEED_ERROR_SUCCESS; 127 } 128 129 //------------------------------------------------------------------------------ 130