/* StarPU --- Runtime system for heterogeneous multicore architectures.
 *
 * Copyright (C) 2010-2012, 2014, 2016  Université de Bordeaux
 * Copyright (C) 2012       INRIA
 * Copyright (C) 2016  CNRS
 *
 * StarPU is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version.
 *
 * StarPU is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * See the GNU Lesser General Public License in COPYING.LGPL for more details.
 */

#include <config.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <starpu.h>
#include <stdlib.h>
#include "../helper.h"

/*
 * Trigger lazy allocation by registering NULL, then setting a value, and
 * then checking it
 */

#define VECTORSIZE	1024

static starpu_data_handle_t v_handle;

/*
 *	Memset
 */

#ifdef STARPU_USE_CUDA
static void cuda_memset_codelet(void *descr[], STARPU_ATTRIBUTE_UNUSED void *_args)
{
	STARPU_SKIP_IF_VALGRIND;

	char *buf = (char *)STARPU_VECTOR_GET_PTR(descr[0]);
	unsigned length = STARPU_VECTOR_GET_NX(descr[0]);

	cudaMemsetAsync(buf, 42, length, starpu_cuda_get_local_stream());
}
#endif

#ifdef STARPU_USE_OPENCL
static void opencl_memset_codelet(void *buffers[], void *args)
{
	(void) args;

	cl_command_queue queue;
	int id = starpu_worker_get_id_check();
	int devid = starpu_worker_get_devid(id);
	starpu_opencl_get_queue(devid, &queue);

	cl_mem buffer = (cl_mem) STARPU_VECTOR_GET_DEV_HANDLE(buffers[0]);
	unsigned length = STARPU_VECTOR_GET_NX(buffers[0]);
	char *v = malloc(length);
	STARPU_ASSERT(v != NULL);
	memset(v, 42, length);

	clEnqueueWriteBuffer(queue,
			     buffer,
			     CL_FALSE,
			     0,      /* offset */
			     length, /* sizeof (char) */
			     v,
			     0,      /* num_events_in_wait_list */
			     NULL,   /* event_wait_list */
			     NULL    /* event */);
}
#endif

void cpu_memset_codelet(void *descr[], STARPU_ATTRIBUTE_UNUSED void *_args)
{
	STARPU_SKIP_IF_VALGRIND;

	char *buf = (char *)STARPU_VECTOR_GET_PTR(descr[0]);
	unsigned length = STARPU_VECTOR_GET_NX(descr[0]);

	memset(buf, 42, length * sizeof(*buf));
}

static struct starpu_codelet memset_cl =
{
	.cpu_funcs = {cpu_memset_codelet},
#ifdef STARPU_USE_CUDA
	.cuda_funcs = {cuda_memset_codelet},
	.cuda_flags = {STARPU_CUDA_ASYNC},
#endif
#ifdef STARPU_USE_OPENCL
	.opencl_funcs = {opencl_memset_codelet},
	.opencl_flags = {STARPU_OPENCL_ASYNC},
#endif
	.cpu_funcs_name = {"cpu_memset_codelet"},
	.nbuffers = 1,
	.modes = {STARPU_W}
};

/*
 *	Check content
 */

void cpu_check_content_codelet(void *descr[], STARPU_ATTRIBUTE_UNUSED void *_args)
{
	STARPU_SKIP_IF_VALGRIND;

	char *buf = (char *)STARPU_VECTOR_GET_PTR(descr[0]);
	unsigned length = STARPU_VECTOR_GET_NX(descr[0]);

	unsigned i;
	for (i = 0; i < length; i++)
	{
		if (buf[i] != 42)
		{
			FPRINTF(stderr, "buf[%u] is %c while it should be %c\n", i, buf[i], 42);
			exit(-1);
		}
	}
}

#ifdef STARPU_USE_CUDA
static void cuda_check_content_codelet(void *descr[], STARPU_ATTRIBUTE_UNUSED void *_args)
{
	STARPU_SKIP_IF_VALGRIND;

	char *buf = (char *)STARPU_VECTOR_GET_PTR(descr[0]);
	unsigned length = STARPU_VECTOR_GET_NX(descr[0]);

	unsigned i;
	for (i = 0; i < length; i++)
	{
		char dst;
		cudaMemcpyAsync(&dst, &buf[i], sizeof(char), cudaMemcpyDeviceToHost, starpu_cuda_get_local_stream());
		cudaStreamSynchronize(starpu_cuda_get_local_stream());
		if (dst != 42)
		{
			FPRINTF(stderr, "buf[%u] is %c while it should be %c\n", i, dst, 42);
			exit(-1);
		}
	}
}
#endif
#ifdef STARPU_USE_OPENCL
static void opencl_check_content_codelet(void *buffers[], void *args)
{
	STARPU_SKIP_IF_VALGRIND;

	cl_command_queue queue;
	int id = starpu_worker_get_id_check();
	int devid = starpu_worker_get_devid(id);
	starpu_opencl_get_queue(devid, &queue);

	cl_mem buf = (cl_mem) STARPU_VECTOR_GET_DEV_HANDLE(buffers[0]);
	unsigned length = STARPU_VECTOR_GET_NX(buffers[0]);

	unsigned i;
	for (i = 0; i < length; i++)
	{
		char dst;
		clEnqueueReadBuffer(queue,
				    buf,
				    CL_FALSE,
				    i * sizeof(dst),
				    sizeof(dst),
				    &dst,
				    0,      /* num_events_in_wait_list */
				    NULL,   /* event_wait_list */
				    NULL    /* event */);
		clFinish(queue);
		if (dst != 42)
		{
			FPRINTF(stderr, "buf[%u] is '%c' while it should be '%c'\n", i, dst, 42);
			exit(-1);
		}
	}
}
#endif

static struct starpu_codelet check_content_cl =
{
	.cpu_funcs = {cpu_check_content_codelet},
#ifdef STARPU_USE_CUDA
	.cuda_funcs = {cuda_check_content_codelet},
#endif
#ifdef STARPU_USE_OPENCL
	.opencl_funcs = {opencl_check_content_codelet},
#endif
	.cpu_funcs_name = {"cpu_check_content_codelet"},
	.nbuffers = 1,
	.modes = {STARPU_R}
};


int main(int argc, char **argv)
{
	int ret;

	ret = starpu_initialize(NULL, &argc, &argv);
	if (ret == -ENODEV) return STARPU_TEST_SKIPPED;
	STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");

	starpu_vector_data_register(&v_handle, (uint32_t)-1, (uintptr_t)NULL, VECTORSIZE, sizeof(char));

	ret = starpu_task_insert(&memset_cl, STARPU_W, v_handle, 0);
	if (ret == -ENODEV)
		return STARPU_TEST_SKIPPED;
	STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_insert");

        ret = starpu_task_wait_for_all();
	STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_wait_for_all");

	ret = starpu_task_insert(&check_content_cl, STARPU_R, v_handle, 0);
	STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_insert");

        ret = starpu_task_wait_for_all();
	STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_wait_for_all");

	starpu_data_unregister(v_handle);

	starpu_shutdown();
	return EXIT_SUCCESS;
}
