xdma端口windows例子程序

以下是一个简单的 XDMA 端口 Windows 例子程序，它使用 OpenCL API 进行数据传输：

#include <CL/cl.h>
#include <stdio.h>
#include <stdlib.h>

#define DATA_SIZE   1024

const char *KernelSource = "\n" \
"__kernel void square( \n" \
"   __global float* input, \n" \
"   __global float* output, \n" \
"   const unsigned int count) \n" \
"{ \n" \
"   int i = get_global_id(0); \n" \
"   if(i < count) \n" \
"       output[i] = input[i] * input[i]; \n" \
"} \n" \
"\n";

int main()
{
    cl_context          context = NULL;
    cl_command_queue    commandQueue = NULL;
    cl_program          program = NULL;
    cl_kernel           kernel = NULL;
    cl_mem              input = NULL;
    cl_mem              output = NULL;
    cl_int              errNum;
    float               inputData[DATA_SIZE];
    float               results[DATA_SIZE];
    unsigned int        correct;

    for(int i = 0; i < DATA_SIZE; i++)
        inputData[i] = i;

    // 创建 OpenCL 上下文
    context = clCreateContextFromType(NULL, CL_DEVICE_TYPE_GPU, NULL, NULL, &errNum);
    if(errNum != CL_SUCCESS)
    {
        printf("Failed to create an OpenCL GPU context.\n");
        return 1;
    }

    // 获取 GPU 设备 ID
    size_t deviceBufferSize = -1;
    clGetContextInfo(context, CL_CONTEXT_DEVICES, 0, NULL, &deviceBufferSize);
    if(deviceBufferSize <= 0)
    {
        printf("No OpenCL compatible GPU devices found.\n");
        return 1;
    }

    cl_device_id *deviceIDs = (cl_device_id *)malloc(deviceBufferSize);
    clGetContextInfo(context, CL_CONTEXT_DEVICES, deviceBufferSize, deviceIDs, NULL);

    // 创建命令队列
    commandQueue = clCreateCommandQueue(context, deviceIDs[0], 0, NULL);
    if(commandQueue == NULL)
    {
        printf("Failed to create an OpenCL command queue.\n");
        return 1;
    }

    // 创建输入和输出缓冲区
    input = clCreateBuffer(context, CL_MEM_READ_ONLY | CL_MEM_COPY_HOST_PTR, sizeof(float) * DATA_SIZE, inputData, NULL);
    output = clCreateBuffer(context, CL_MEM_WRITE_ONLY, sizeof(float) * DATA_SIZE, NULL, NULL);
    if(input == NULL || output == NULL)
    {
        printf("Failed to create OpenCL input and/or output buffers.\n");
        return 1;
    }

    // 创建内核程序对象
    program = clCreateProgramWithSource(context, 1, (const char **)&KernelSource, NULL, &errNum);
    if(program == NULL)
    {
        printf("Failed to create OpenCL program object.\n");
        return 1;
    }

    // 编译内核程序
    errNum = clBuildProgram(program, 0, NULL, NULL, NULL, NULL);
    if(errNum != CL_SUCCESS)
    {
        char buildLog[16384];
        clGetProgramBuildInfo(program, deviceIDs[0], CL_PROGRAM_BUILD_LOG, sizeof(buildLog), buildLog, NULL);
        printf("Error in kernel: %s\n", buildLog);
        clReleaseProgram(program);
        clReleaseMemObject(input);
        clReleaseMemObject(output);
        clReleaseCommandQueue(commandQueue);
        clReleaseContext(context);
        return 1;
    }

    // 创建内核对象
    kernel = clCreateKernel(program, "square", NULL);
    if(kernel == NULL)
    {
        printf("Failed to create OpenCL kernel object.\n");
        clReleaseProgram(program);
        clReleaseMemObject(input);
        clReleaseMemObject(output);
        clReleaseCommandQueue(commandQueue);
        clReleaseContext(context);
        return 1;
    }

    // 设置内核参数
    errNum = clSetKernelArg(kernel, 0, sizeof(cl_mem), &input);
    errNum |= clSetKernelArg(kernel, 1, sizeof(cl_mem), &output);
    errNum |= clSetKernelArg(kernel, 2, sizeof(unsigned int), &DATA_SIZE);
    if(errNum != CL_SUCCESS)
    {
        printf("Error setting kernel arguments.\n");
        clReleaseKernel(kernel);
        clReleaseProgram(program);
        clReleaseMemObject(input);
        clReleaseMemObject(output);
        clReleaseCommandQueue(commandQueue);
        clReleaseContext(context);
        return 1;
    }

    // 执行内核
    size_t globalWorkSize[1] = { DATA_SIZE };
    size_t localWorkSize[1] = { 1 };
    errNum = clEnqueueNDRangeKernel(commandQueue, kernel, 1, NULL, globalWorkSize, localWorkSize, 0, NULL, NULL);
    if(errNum != CL_SUCCESS)
    {
        printf("Error queuing kernel for execution.\n");
        clReleaseKernel(kernel);
        clReleaseProgram(program);
        clReleaseMemObject(input);
        clReleaseMemObject(output);
        clReleaseCommandQueue(commandQueue);
        clReleaseContext(context);
        return 1;
    }

    // 读取输出缓冲区数据
    errNum = clEnqueueReadBuffer(commandQueue, output, CL_TRUE, 0, sizeof(float) * DATA_SIZE, results, 0, NULL, NULL);
    if(errNum != CL_SUCCESS)
    {
        printf("Error reading output buffer.\n");
        clReleaseKernel(kernel);
        clReleaseProgram(program);
        clReleaseMemObject(input);
        clReleaseMemObject(output);
        clReleaseCommandQueue(commandQueue);
        clReleaseContext(context);
        return 1;
    }

    // 验证结果
    correct = 0;
    for(int i = 0; i < DATA_SIZE; i++)
    {
        if(results[i] == inputData[i] * inputData[i])
            correct++;
    }

    printf("Computed '%d/%d' correct values!\n", correct, DATA_SIZE);

    // 释放资源
    clReleaseKernel(kernel);
    clReleaseProgram(program);
    clReleaseMemObject(input);
    clReleaseMemObject(output);
    clReleaseCommandQueue(commandQueue);
    clReleaseContext(context);

    return 0;
}

注意，此程序仅是一个示例，实际使用时需要根据具体的 XDMA 硬件和驱动程序进行修改。