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/*!
* \file cudalibxt.h  
* \brief Public header file for the NVIDIA library multi-GPU support structures  
*/

#ifndef _CUDA_LIB_XT_H_
#define _CUDA_LIB_XT_H_
#include <cuda_runtime.h>

#define CUDA_XT_DESCRIPTOR_VERSION 0x01000000 // This is added to CUDART_VERSION

enum cudaXtCopyType_t {
    LIB_XT_COPY_HOST_TO_DEVICE,
    LIB_XT_COPY_DEVICE_TO_HOST,
    LIB_XT_COPY_DEVICE_TO_DEVICE
} ;
typedef enum cudaXtCopyType_t cudaLibXtCopyType;

enum libFormat_t {
    LIB_FORMAT_CUFFT        = 0x0,
    LIB_FORMAT_UNDEFINED    = 0x1
};

typedef enum libFormat_t libFormat;

#define MAX_CUDA_DESCRIPTOR_GPUS 64

struct cudaXtDesc_t{
    int version;                             //descriptor version
    int nGPUs;                               //number of GPUs 
    int GPUs[MAX_CUDA_DESCRIPTOR_GPUS];      //array of device IDs
    void *data[MAX_CUDA_DESCRIPTOR_GPUS];    //array of pointers to data, one per GPU
    size_t size[MAX_CUDA_DESCRIPTOR_GPUS];   //array of data sizes, one per GPU
    void *cudaXtState;                       //opaque CUDA utility structure
};
typedef struct cudaXtDesc_t cudaXtDesc;

struct cudaLibXtDesc_t{
    int version;                //descriptor version
    cudaXtDesc *descriptor;     //multi-GPU memory descriptor
    libFormat library;          //which library recognizes the format
    int subFormat;              //library specific enumerator of sub formats
    void *libDescriptor;        //library specific descriptor e.g. FFT transform plan object
};
typedef struct cudaLibXtDesc_t cudaLibXtDesc;

#endif

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