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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 device identificator
57 * An OpenCL device is identified by its ID.
58 * The platform ID is also included for caching reasons.
62 cl_platform_id ocl_platform_id; /**< Platform ID */
63 cl_device_id ocl_device_id; /**< Device ID */
67 * \brief OpenCL device information.
69 * The OpenCL device information is queried and set at detection and contains
70 * both information about the device/hardware returned by the runtime as well
71 * as additional data like support status.
73 struct gmx_device_info_t
75 ocl_gpu_id_t ocl_gpu_id; /**< device ID assigned at detection */
76 char device_name[256]; /**< device name */
77 char device_version[256]; /**< device version */
78 char vendorName[256]; /**< device vendor */
79 int compute_units; /**< number of compute units */
80 int adress_bits; /**< number of adress bits the device is capable of */
81 int stat; /**< device status takes values of e_gpu_detect_res_t */
82 DeviceVendor deviceVendor; /**< device vendor */
83 size_t maxWorkItemSizes[3]; /**< workgroup size limits (CL_DEVICE_MAX_WORK_ITEM_SIZES) */
84 size_t maxWorkGroupSize; /**< workgroup total size limit (CL_DEVICE_MAX_WORK_GROUP_SIZE) */
88 * \brief OpenCL GPU runtime data
90 * The device runtime data is meant to hold objects associated with a GROMACS rank's
91 * (thread or process) use of a single device (multiple devices per rank is not
92 * implemented). These objects should be constructed at ther point where a device
93 * dets assigned to a rank and released at when this assignment is no longer valid
94 * (i.e. at cleanup in the current implementation).
97 struct gmx_device_runtime_data_t
99 cl_context context; /**< OpenCL context */
100 cl_program program; /**< OpenCL program */
103 /*! \brief Launches synchronous or asynchronous device to host memory copy.
105 * If copy_event is not NULL, on return it will contain an event object
106 * identifying this particular device to host operation. The event can further
107 * be used to queue a wait for this operation or to query profiling information.
109 int ocl_copy_D2H(void* h_dest,
113 GpuApiCallBehavior transferKind,
114 cl_command_queue command_queue,
115 cl_event* copy_event);
118 /*! \brief Launches asynchronous device to host memory copy. */
119 int ocl_copy_D2H_async(void* h_dest,
123 cl_command_queue command_queue,
124 cl_event* copy_event);
126 /*! \brief Launches synchronous or asynchronous host to device memory copy.
128 * If copy_event is not NULL, on return it will contain an event object
129 * identifying this particular host to device operation. The event can further
130 * be used to queue a wait for this operation or to query profiling information.
132 int ocl_copy_H2D(cl_mem d_dest,
136 GpuApiCallBehavior transferKind,
137 cl_command_queue command_queue,
138 cl_event* copy_event);
140 /*! \brief Launches asynchronous host to device memory copy. */
141 int ocl_copy_H2D_async(cl_mem d_dest,
145 cl_command_queue command_queue,
146 cl_event* copy_event);
148 /*! \brief Launches synchronous host to device memory copy. */
149 int ocl_copy_H2D_sync(cl_mem d_dest, const void* h_src, size_t offset, size_t bytes, cl_command_queue command_queue);
151 /*! \brief Allocate host memory in malloc style */
152 void pmalloc(void** h_ptr, size_t nbytes);
154 /*! \brief Free host memory in malloc style */
155 void pfree(void* h_ptr);
157 /*! \brief Convert error code to diagnostic string */
158 std::string ocl_get_error_string(cl_int error);
160 /*! \brief Calls clFinish() in the stream \p s.
162 * \param[in] s stream to synchronize with
164 static inline void gpuStreamSynchronize(cl_command_queue s)
166 cl_int cl_error = clFinish(s);
167 GMX_RELEASE_ASSERT(CL_SUCCESS == cl_error,
168 ("Error caught during clFinish:" + ocl_get_error_string(cl_error)).c_str());
171 //! A debug checker to track cl_events being released correctly
172 inline void ensureReferenceCount(const cl_event& event, unsigned int refCount)
175 cl_int clError = clGetEventInfo(event, CL_EVENT_REFERENCE_COUNT, sizeof(refCount), &refCount, nullptr);
176 GMX_ASSERT(CL_SUCCESS == clError, ocl_get_error_string(clError).c_str());
177 GMX_ASSERT(refCount == refCount, "Unexpected reference count");
179 GMX_UNUSED_VALUE(event);
180 GMX_UNUSED_VALUE(refCount);
184 /*! \brief Pretend to synchronize an OpenCL stream (dummy implementation).
186 * \param[in] s queue to check
188 * \returns True if all tasks enqueued in the stream \p s (at the time of this call) have completed.
190 static inline bool haveStreamTasksCompleted(cl_command_queue gmx_unused s)
192 GMX_RELEASE_ASSERT(false, "haveStreamTasksCompleted is not implemented for OpenCL");
196 /* Kernel launch helpers */
199 * A function for setting up a single OpenCL kernel argument.
200 * This is the tail of the compile-time recursive function below.
201 * It has to be seen by the compiler first.
202 * As NB kernels might be using dynamic local memory as the last argument,
203 * this function also manages that, using sharedMemorySize from \p config.
205 * \param[in] kernel Kernel function handle
206 * \param[in] config Kernel configuration for launching
207 * \param[in] argIndex Index of the current argument
209 void inline prepareGpuKernelArgument(cl_kernel kernel, const KernelLaunchConfig& config, size_t argIndex)
211 if (config.sharedMemorySize > 0)
213 cl_int gmx_used_in_debug clError =
214 clSetKernelArg(kernel, argIndex, config.sharedMemorySize, nullptr);
215 GMX_ASSERT(CL_SUCCESS == clError, ocl_get_error_string(clError).c_str());
220 * Compile-time recursive function for setting up a single OpenCL kernel argument.
221 * This function uses one kernel argument pointer \p argPtr to call clSetKernelArg(),
222 * and calls itself on the next argument, eventually calling the tail function above.
224 * \tparam CurrentArg Type of the current argument
225 * \tparam RemainingArgs Types of remaining arguments after the current one
226 * \param[in] kernel Kernel function handle
227 * \param[in] config Kernel configuration for launching
228 * \param[in] argIndex Index of the current argument
229 * \param[in] argPtr Pointer to the current argument
230 * \param[in] otherArgsPtrs Pack of pointers to arguments remaining to process after the current one
232 template<typename CurrentArg, typename... RemainingArgs>
233 void prepareGpuKernelArgument(cl_kernel kernel,
234 const KernelLaunchConfig& config,
236 const CurrentArg* argPtr,
237 const RemainingArgs*... otherArgsPtrs)
239 cl_int gmx_used_in_debug clError = clSetKernelArg(kernel, argIndex, sizeof(CurrentArg), argPtr);
240 GMX_ASSERT(CL_SUCCESS == clError, ocl_get_error_string(clError).c_str());
242 // Assert on types not allowed to be passed to a kernel
243 // (as per section 6.9 of the OpenCL spec).
244 static_assert(!std::is_same<CurrentArg, bool>::value && !std::is_same<CurrentArg, size_t>::value
245 && !std::is_same<CurrentArg, ptrdiff_t>::value
246 && !std::is_same<CurrentArg, intptr_t>::value
247 && !std::is_same<CurrentArg, uintptr_t>::value,
248 "Invalid type passed to OpenCL kernel functions (see OpenCL spec section 6.9).");
250 prepareGpuKernelArgument(kernel, config, argIndex + 1, otherArgsPtrs...);
254 * A wrapper function for setting up all the OpenCL kernel arguments.
255 * Calls the recursive functions above.
257 * \tparam Args Types of all the kernel arguments
258 * \param[in] kernel Kernel function handle
259 * \param[in] config Kernel configuration for launching
260 * \param[in] argsPtrs Pointers to all the kernel arguments
261 * \returns A handle for the prepared parameter pack to be used with launchGpuKernel() as the last argument
262 * - currently always nullptr for OpenCL, as it manages kernel/arguments association by itself.
264 template<typename... Args>
265 void* prepareGpuKernelArguments(cl_kernel kernel, const KernelLaunchConfig& config, const Args*... argsPtrs)
267 prepareGpuKernelArgument(kernel, config, 0, argsPtrs...);
271 /*! \brief Launches the OpenCL kernel and handles the errors.
273 * \param[in] kernel Kernel function handle
274 * \param[in] config Kernel configuration for launching
275 * \param[in] timingEvent Timing event, fetched from GpuRegionTimer
276 * \param[in] kernelName Human readable kernel description, for error handling only
277 * \throws gmx::InternalError on kernel launch failure
279 inline void launchGpuKernel(cl_kernel kernel,
280 const KernelLaunchConfig& config,
281 CommandEvent* timingEvent,
282 const char* kernelName,
283 const void* /*kernelArgs*/)
285 const int workDimensions = 3;
286 const size_t* globalWorkOffset = nullptr;
287 const size_t waitListSize = 0;
288 const cl_event* waitList = nullptr;
289 size_t globalWorkSize[3];
290 for (int i = 0; i < workDimensions; i++)
292 globalWorkSize[i] = config.gridSize[i] * config.blockSize[i];
294 cl_int clError = clEnqueueNDRangeKernel(config.stream, kernel, workDimensions, globalWorkOffset,
295 globalWorkSize, config.blockSize, waitListSize,
296 waitList, timingEvent);
297 if (CL_SUCCESS != clError)
299 const std::string errorMessage = "GPU kernel (" + std::string(kernelName)
300 + ") failed to launch: " + ocl_get_error_string(clError);
301 GMX_THROW(gmx::InternalError(errorMessage));