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36 /*! \libinternal \file
37 * \brief Declare utility routines for OpenCL
39 * \author Anca Hamuraru <anca@streamcomputing.eu>
42 #ifndef GMX_GPU_UTILS_OCLUTILS_H
43 #define GMX_GPU_UTILS_OCLUTILS_H
47 #include "gromacs/gpu_utils/gmxopencl.h"
48 #include "gromacs/gpu_utils/gputraits_ocl.h"
49 #include "gromacs/utility/exceptions.h"
50 #include "gromacs/utility/gmxassert.h"
52 enum class GpuApiCallBehavior;
55 * \brief OpenCL GPU runtime data
57 * The device runtime data is meant to hold objects associated with a GROMACS rank's
58 * (thread or process) use of a single device (multiple devices per rank is not
59 * implemented). These objects should be constructed at ther point where a device
60 * dets assigned to a rank and released at when this assignment is no longer valid
61 * (i.e. at cleanup in the current implementation).
64 struct gmx_device_runtime_data_t
66 cl_context context; /**< OpenCL context */
67 cl_program program; /**< OpenCL program */
70 /*! \brief Launches synchronous or asynchronous device to host memory copy.
72 * If copy_event is not NULL, on return it will contain an event object
73 * identifying this particular device to host operation. The event can further
74 * be used to queue a wait for this operation or to query profiling information.
76 int ocl_copy_D2H(void* h_dest,
80 GpuApiCallBehavior transferKind,
81 cl_command_queue command_queue,
82 cl_event* copy_event);
85 /*! \brief Launches asynchronous device to host memory copy. */
86 int ocl_copy_D2H_async(void* h_dest,
90 cl_command_queue command_queue,
91 cl_event* copy_event);
93 /*! \brief Launches synchronous or asynchronous host to device memory copy.
95 * If copy_event is not NULL, on return it will contain an event object
96 * identifying this particular host to device operation. The event can further
97 * be used to queue a wait for this operation or to query profiling information.
99 int ocl_copy_H2D(cl_mem d_dest,
103 GpuApiCallBehavior transferKind,
104 cl_command_queue command_queue,
105 cl_event* copy_event);
107 /*! \brief Launches asynchronous host to device memory copy. */
108 int ocl_copy_H2D_async(cl_mem d_dest,
112 cl_command_queue command_queue,
113 cl_event* copy_event);
115 /*! \brief Launches synchronous host to device memory copy. */
116 int ocl_copy_H2D_sync(cl_mem d_dest, const void* h_src, size_t offset, size_t bytes, cl_command_queue command_queue);
118 /*! \brief Allocate host memory in malloc style */
119 void pmalloc(void** h_ptr, size_t nbytes);
121 /*! \brief Free host memory in malloc style */
122 void pfree(void* h_ptr);
124 /*! \brief Convert error code to diagnostic string */
125 std::string ocl_get_error_string(cl_int error);
127 /*! \brief Calls clFinish() in the stream \p s.
129 * \param[in] s stream to synchronize with
131 static inline void gpuStreamSynchronize(cl_command_queue s)
133 cl_int cl_error = clFinish(s);
134 GMX_RELEASE_ASSERT(CL_SUCCESS == cl_error,
135 ("Error caught during clFinish:" + ocl_get_error_string(cl_error)).c_str());
138 //! A debug checker to track cl_events being released correctly
139 inline void ensureReferenceCount(const cl_event& event, unsigned int refCount)
142 cl_int clError = clGetEventInfo(event, CL_EVENT_REFERENCE_COUNT, sizeof(refCount), &refCount, nullptr);
143 GMX_ASSERT(CL_SUCCESS == clError, ocl_get_error_string(clError).c_str());
144 GMX_ASSERT(refCount == refCount, "Unexpected reference count");
146 GMX_UNUSED_VALUE(event);
147 GMX_UNUSED_VALUE(refCount);
151 /*! \brief Pretend to synchronize an OpenCL stream (dummy implementation).
153 * \param[in] s queue to check
155 * \returns True if all tasks enqueued in the stream \p s (at the time of this call) have completed.
157 static inline bool haveStreamTasksCompleted(cl_command_queue gmx_unused s)
159 GMX_RELEASE_ASSERT(false, "haveStreamTasksCompleted is not implemented for OpenCL");
163 /* Kernel launch helpers */
166 * A function for setting up a single OpenCL kernel argument.
167 * This is the tail of the compile-time recursive function below.
168 * It has to be seen by the compiler first.
169 * As NB kernels might be using dynamic local memory as the last argument,
170 * this function also manages that, using sharedMemorySize from \p config.
172 * \param[in] kernel Kernel function handle
173 * \param[in] config Kernel configuration for launching
174 * \param[in] argIndex Index of the current argument
176 void inline prepareGpuKernelArgument(cl_kernel kernel, const KernelLaunchConfig& config, size_t argIndex)
178 if (config.sharedMemorySize > 0)
180 cl_int gmx_used_in_debug clError =
181 clSetKernelArg(kernel, argIndex, config.sharedMemorySize, nullptr);
182 GMX_ASSERT(CL_SUCCESS == clError, ocl_get_error_string(clError).c_str());
187 * Compile-time recursive function for setting up a single OpenCL kernel argument.
188 * This function uses one kernel argument pointer \p argPtr to call clSetKernelArg(),
189 * and calls itself on the next argument, eventually calling the tail function above.
191 * \tparam CurrentArg Type of the current argument
192 * \tparam RemainingArgs Types of remaining arguments after the current one
193 * \param[in] kernel Kernel function handle
194 * \param[in] config Kernel configuration for launching
195 * \param[in] argIndex Index of the current argument
196 * \param[in] argPtr Pointer to the current argument
197 * \param[in] otherArgsPtrs Pack of pointers to arguments remaining to process after the current one
199 template<typename CurrentArg, typename... RemainingArgs>
200 void prepareGpuKernelArgument(cl_kernel kernel,
201 const KernelLaunchConfig& config,
203 const CurrentArg* argPtr,
204 const RemainingArgs*... otherArgsPtrs)
206 cl_int gmx_used_in_debug clError = clSetKernelArg(kernel, argIndex, sizeof(CurrentArg), argPtr);
207 GMX_ASSERT(CL_SUCCESS == clError, ocl_get_error_string(clError).c_str());
209 // Assert on types not allowed to be passed to a kernel
210 // (as per section 6.9 of the OpenCL spec).
211 static_assert(!std::is_same<CurrentArg, bool>::value && !std::is_same<CurrentArg, size_t>::value
212 && !std::is_same<CurrentArg, ptrdiff_t>::value
213 && !std::is_same<CurrentArg, intptr_t>::value
214 && !std::is_same<CurrentArg, uintptr_t>::value,
215 "Invalid type passed to OpenCL kernel functions (see OpenCL spec section 6.9).");
217 prepareGpuKernelArgument(kernel, config, argIndex + 1, otherArgsPtrs...);
221 * A wrapper function for setting up all the OpenCL kernel arguments.
222 * Calls the recursive functions above.
224 * \tparam Args Types of all the kernel arguments
225 * \param[in] kernel Kernel function handle
226 * \param[in] config Kernel configuration for launching
227 * \param[in] argsPtrs Pointers to all the kernel arguments
228 * \returns A handle for the prepared parameter pack to be used with launchGpuKernel() as the last argument
229 * - currently always nullptr for OpenCL, as it manages kernel/arguments association by itself.
231 template<typename... Args>
232 void* prepareGpuKernelArguments(cl_kernel kernel, const KernelLaunchConfig& config, const Args*... argsPtrs)
234 prepareGpuKernelArgument(kernel, config, 0, argsPtrs...);
238 /*! \brief Launches the OpenCL kernel and handles the errors.
240 * \param[in] kernel Kernel function handle
241 * \param[in] config Kernel configuration for launching
242 * \param[in] timingEvent Timing event, fetched from GpuRegionTimer
243 * \param[in] kernelName Human readable kernel description, for error handling only
244 * \throws gmx::InternalError on kernel launch failure
246 inline void launchGpuKernel(cl_kernel kernel,
247 const KernelLaunchConfig& config,
248 CommandEvent* timingEvent,
249 const char* kernelName,
250 const void* /*kernelArgs*/)
252 const int workDimensions = 3;
253 const size_t* globalWorkOffset = nullptr;
254 const size_t waitListSize = 0;
255 const cl_event* waitList = nullptr;
256 size_t globalWorkSize[3];
257 for (int i = 0; i < workDimensions; i++)
259 globalWorkSize[i] = config.gridSize[i] * config.blockSize[i];
261 cl_int clError = clEnqueueNDRangeKernel(config.stream, kernel, workDimensions, globalWorkOffset,
262 globalWorkSize, config.blockSize, waitListSize,
263 waitList, timingEvent);
264 if (CL_SUCCESS != clError)
266 const std::string errorMessage = "GPU kernel (" + std::string(kernelName)
267 + ") failed to launch: " + ocl_get_error_string(clError);
268 GMX_THROW(gmx::InternalError(errorMessage));