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lammps/lib/gpu/geryon/ocl_kernel.h

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/***************************************************************************
ocl_kernel.h
-------------------
W. Michael Brown
Utilities for dealing with OpenCL kernels
__________________________________________________________________________
This file is part of the Geryon Unified Coprocessor Library (UCL)
__________________________________________________________________________
begin : Sun Feb 7 2010
copyright : (C) 2010 by W. Michael Brown
email : brownw@ornl.gov
***************************************************************************/
/* -----------------------------------------------------------------------
Copyright (2010) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This software is distributed under
the Simplified BSD License.
----------------------------------------------------------------------- */
#ifndef OCL_KERNEL
#define OCL_KERNEL
#include "ocl_device.h"
#include <fstream>
namespace ucl_opencl {
/// Class storing 1 or more kernel functions from a single string or file
class UCL_Program {
public:
inline UCL_Program() : _init_done(false) {}
inline UCL_Program(UCL_Device &device) : _init_done(false) { init(device); }
inline ~UCL_Program() { clear(); }
/// Initialize the program with a device
inline void init(UCL_Device &device) {
clear();
_device=device.cl_device();
_context=device.context();
_cq=device.cq();
CL_SAFE_CALL(clRetainContext(_context));
CL_SAFE_CALL(clRetainCommandQueue(_cq));
_init_done=true;
}
/// Clear any data associated with program
/** \note Must call init() after each clear **/
inline void clear() {
if (_init_done) {
CL_DESTRUCT_CALL(clReleaseProgram(_program));
CL_DESTRUCT_CALL(clReleaseContext(_context));
CL_DESTRUCT_CALL(clReleaseCommandQueue(_cq));
_init_done=false;
}
}
/// Load a program from a file and compile with flags
inline int load(const char *filename, const char *flags="",
std::string *log=NULL) {
std::ifstream in(filename);
if (!in || in.is_open()==false) {
#ifndef UCL_NO_EXIT
std::cerr << "UCL Error: Could not open kernel file: "
<< filename << std::endl;
UCL_GERYON_EXIT;
#endif
return UCL_FILE_NOT_FOUND;
}
std::string program((std::istreambuf_iterator<char>(in)),
std::istreambuf_iterator<char>());
in.close();
return load_string(program.c_str(),flags,log);
}
/// Load a program from a string and compile with flags
inline int load_string(const char *program, const char *flags="",
std::string *log=NULL) {
cl_int error_flag;
const char *prog=program;
_program=clCreateProgramWithSource(_context,1,&prog,NULL,&error_flag);
CL_CHECK_ERR(error_flag);
error_flag = clBuildProgram(_program,1,&_device,flags,NULL,NULL);
if (error_flag!=-11)
CL_CHECK_ERR(error_flag);
cl_build_status build_status;
CL_SAFE_CALL(clGetProgramBuildInfo(_program,_device,
CL_PROGRAM_BUILD_STATUS,
sizeof(cl_build_status),&build_status,
NULL));
if (build_status != CL_SUCCESS || log!=NULL) {
size_t ms;
CL_SAFE_CALL(clGetProgramBuildInfo(_program,_device,CL_PROGRAM_BUILD_LOG,0,
NULL, &ms));
char build_log[ms];
CL_SAFE_CALL(clGetProgramBuildInfo(_program,_device,CL_PROGRAM_BUILD_LOG,ms,
build_log, NULL));
if (log!=NULL)
*log=std::string(build_log);
if (build_status != CL_SUCCESS) {
#ifndef UCL_NO_EXIT
std::cerr << std::endl
<< "----------------------------------------------------------\n"
<< " UCL Error: Error compiling OpenCL Program ("
<< build_status << ") ...\n"
<< "----------------------------------------------------------\n";
std::cerr << build_log << std::endl;
#endif
return UCL_COMPILE_ERROR;
}
}
return UCL_SUCCESS;
}
friend class UCL_Kernel;
private:
bool _init_done;
cl_program _program;
cl_device_id _device;
cl_context _context;
cl_command_queue _cq;
};
/// Class for dealing with OpenCL kernels
class UCL_Kernel {
public:
UCL_Kernel() : _dimensions(1), _function_set(false), _num_args(0)
{ _block_size[0]=0; _num_blocks[0]=0; }
inline UCL_Kernel(UCL_Program &program, const char *function) :
_dimensions(1), _function_set(false), _num_args(0)
{ _block_size[0]=0; _num_blocks[0]=0; set_function(program,function); }
inline ~UCL_Kernel() { clear(); }
/// Clear any function associated with the kernel
inline void clear() {
if (_function_set) {
clReleaseKernel(_kernel);
clReleaseProgram(_program);
clReleaseCommandQueue(_cq);
_function_set=false;
}
}
/// Get the kernel function from a program
/** \return UCL_ERROR_FLAG (UCL_SUCCESS, UCL_FILE_NOT_FOUND, UCL_ERROR) **/
inline int set_function(UCL_Program &program, const char *function);
/// Set the kernel argument.
/** If not a device pointer, this must be repeated each time the argument
* changes **/
template <class dtype>
inline void set_arg(const cl_uint index, dtype *arg) {
CL_SAFE_CALL(clSetKernelArg(_kernel,index,sizeof(dtype),arg));
if (index>_num_args) _num_args=index;
}
/// Add a kernel argument.
template <class dtype>
inline void add_arg(dtype *arg) {
CL_SAFE_CALL(clSetKernelArg(_kernel,_num_args,sizeof(dtype),arg));
_num_args++;
}
/// Set the number of thread blocks and the number of threads in each block
inline void set_size(const size_t num_blocks, const size_t block_size) {
_dimensions=1;
_num_blocks[0]=num_blocks*block_size;
_block_size[0]=block_size;
}
/// Set the number of thread blocks and the number of threads in each block
inline void set_size(const size_t num_blocks_x, const size_t num_blocks_y,
const size_t block_size_x, const size_t block_size_y) {
_dimensions=2;
_num_blocks[0]=num_blocks_x*block_size_x;
_block_size[0]=block_size_x;
_num_blocks[1]=num_blocks_y*block_size_y;
_block_size[1]=block_size_y;
}
/// Set the number of thread blocks and the number of threads in each block
inline void set_size(const size_t num_blocks_x, const size_t num_blocks_y,
const size_t block_size_x,
const size_t block_size_y, const size_t block_size_z) {
_dimensions=3;
const size_t num_blocks_z=1;
_num_blocks[0]=num_blocks_x*block_size_x;
_block_size[0]=block_size_x;
_num_blocks[1]=num_blocks_y*block_size_y;
_block_size[1]=block_size_y;
_num_blocks[2]=num_blocks_z*block_size_z;
_block_size[2]=block_size_z;
}
/// Run the kernel in the default command queue
inline void run() {
run(_cq);
}
/// Run the kernel in the specified command queue
inline void run(command_queue &cq) {
CL_SAFE_CALL(clEnqueueNDRangeKernel(cq,_kernel,_dimensions,NULL,
_num_blocks,_block_size,0,NULL,NULL));
}
/// Clear any arguments associated with the kernel
inline void clear_args() { _num_args=0; }
#include "ucl_arg_kludge.h"
private:
cl_kernel _kernel;
cl_program _program;
cl_uint _dimensions;
size_t _block_size[3];
size_t _num_blocks[3];
bool _function_set;
cl_command_queue _cq; // The default command queue for this kernel
unsigned _num_args;
};
inline int UCL_Kernel::set_function(UCL_Program &program, const char *function) {
clear();
_function_set=true;
_cq=program._cq;
CL_SAFE_CALL(clRetainCommandQueue(_cq));
_program=program._program;
CL_SAFE_CALL(clRetainProgram(_program));
cl_int error_flag;
_kernel=clCreateKernel(program._program,function,&error_flag);
if (error_flag!=CL_SUCCESS) {
#ifndef UCL_NO_EXIT
std::cerr << "UCL Error: Could not find function: " << function
<< " in program.\n";
UCL_GERYON_EXIT;
#endif
return UCL_FUNCTION_NOT_FOUND;
}
return UCL_SUCCESS;
}
} // namespace
#endif
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