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These Licensed Deliverables are a * "commercial item" as that term is defined at 48 C.F.R. 2.101 (OCT * 1995), consisting of "commercial computer software" and "commercial * computer software documentation" as such terms are used in 48 * C.F.R. 12.212 (SEPT 1995) and is provided to the U.S. Government * only as a commercial end item. Consistent with 48 C.F.R.12.212 and * 48 C.F.R. 227.7202-1 through 227.7202-4 (JUNE 1995), all * U.S. Government End Users acquire the Licensed Deliverables with * only those rights set forth herein. * * Any use of the Licensed Deliverables in individual and commercial * software must include, in the user documentation and internal * comments to the code, the above Disclaimer and U.S. Government End * Users Notice. */ /** * @file cufile.h * @brief cuFile C APIs * * This file contains all the C APIs to perform GPUDirect Storage supported IO operations */ #ifdef __cplusplus extern "C" { #endif /// @cond DOXYGEN_SKIP_MACRO #ifndef __CUFILE_H_ #define __CUFILE_H_ #include #include #include #include #include #define CUFILEOP_BASE_ERR 5000 //Note :Data path errors are captured via standard error codes #define CUFILEOP_STATUS_ENTRIES \ CUFILE_OP(0, CU_FILE_SUCCESS, cufile success) \ CUFILE_OP(CUFILEOP_BASE_ERR + 1, CU_FILE_DRIVER_NOT_INITIALIZED, nvidia-fs driver is not loaded. Set allow_compat_mode to true in cufile.json file to enable compatible mode) \ CUFILE_OP(CUFILEOP_BASE_ERR + 2, CU_FILE_DRIVER_INVALID_PROPS, invalid property) \ CUFILE_OP(CUFILEOP_BASE_ERR + 3, CU_FILE_DRIVER_UNSUPPORTED_LIMIT, property range error) \ CUFILE_OP(CUFILEOP_BASE_ERR + 4, CU_FILE_DRIVER_VERSION_MISMATCH, nvidia-fs driver version mismatch) \ CUFILE_OP(CUFILEOP_BASE_ERR + 5, CU_FILE_DRIVER_VERSION_READ_ERROR, nvidia-fs driver version read error) \ CUFILE_OP(CUFILEOP_BASE_ERR + 6, CU_FILE_DRIVER_CLOSING, driver shutdown in progress) \ CUFILE_OP(CUFILEOP_BASE_ERR + 7, CU_FILE_PLATFORM_NOT_SUPPORTED, GPUDirect Storage not supported on current platform) \ CUFILE_OP(CUFILEOP_BASE_ERR + 8, CU_FILE_IO_NOT_SUPPORTED, GPUDirect Storage not supported on current file) \ CUFILE_OP(CUFILEOP_BASE_ERR + 9, CU_FILE_DEVICE_NOT_SUPPORTED, GPUDirect Storage not supported on current GPU) \ CUFILE_OP(CUFILEOP_BASE_ERR + 10, CU_FILE_NVFS_DRIVER_ERROR, nvidia-fs driver ioctl error) \ CUFILE_OP(CUFILEOP_BASE_ERR + 11, CU_FILE_CUDA_DRIVER_ERROR, CUDA Driver API error) \ CUFILE_OP(CUFILEOP_BASE_ERR + 12, CU_FILE_CUDA_POINTER_INVALID, invalid device pointer) \ CUFILE_OP(CUFILEOP_BASE_ERR + 13, CU_FILE_CUDA_MEMORY_TYPE_INVALID, invalid pointer memory type) \ CUFILE_OP(CUFILEOP_BASE_ERR + 14, CU_FILE_CUDA_POINTER_RANGE_ERROR, pointer range exceeds allocated address range) \ CUFILE_OP(CUFILEOP_BASE_ERR + 15, CU_FILE_CUDA_CONTEXT_MISMATCH, cuda context mismatch) \ CUFILE_OP(CUFILEOP_BASE_ERR + 16, CU_FILE_INVALID_MAPPING_SIZE, access beyond maximum pinned size) \ CUFILE_OP(CUFILEOP_BASE_ERR + 17, CU_FILE_INVALID_MAPPING_RANGE, access beyond mapped size) \ CUFILE_OP(CUFILEOP_BASE_ERR + 18, CU_FILE_INVALID_FILE_TYPE, unsupported file type) \ CUFILE_OP(CUFILEOP_BASE_ERR + 19, CU_FILE_INVALID_FILE_OPEN_FLAG, unsupported file open flags) \ CUFILE_OP(CUFILEOP_BASE_ERR + 20, CU_FILE_DIO_NOT_SET, fd direct IO not set) \ CUFILE_OP(CUFILEOP_BASE_ERR + 22, CU_FILE_INVALID_VALUE, invalid arguments) \ CUFILE_OP(CUFILEOP_BASE_ERR + 23, CU_FILE_MEMORY_ALREADY_REGISTERED, device pointer already registered) \ CUFILE_OP(CUFILEOP_BASE_ERR + 24, CU_FILE_MEMORY_NOT_REGISTERED, device pointer lookup failure) \ CUFILE_OP(CUFILEOP_BASE_ERR + 25, CU_FILE_PERMISSION_DENIED, driver or file access error) \ CUFILE_OP(CUFILEOP_BASE_ERR + 26, CU_FILE_DRIVER_ALREADY_OPEN, driver is already open) \ CUFILE_OP(CUFILEOP_BASE_ERR + 27, CU_FILE_HANDLE_NOT_REGISTERED, file descriptor is not registered) \ CUFILE_OP(CUFILEOP_BASE_ERR + 28, CU_FILE_HANDLE_ALREADY_REGISTERED, file descriptor is already registered) \ CUFILE_OP(CUFILEOP_BASE_ERR + 29, CU_FILE_DEVICE_NOT_FOUND, GPU device not found) \ CUFILE_OP(CUFILEOP_BASE_ERR + 30, CU_FILE_INTERNAL_ERROR, internal error) \ CUFILE_OP(CUFILEOP_BASE_ERR + 31, CU_FILE_GETNEWFD_FAILED, failed to obtain new file descriptor) \ CUFILE_OP(CUFILEOP_BASE_ERR + 33, CU_FILE_NVFS_SETUP_ERROR, NVFS driver initialization error) \ CUFILE_OP(CUFILEOP_BASE_ERR + 34, CU_FILE_IO_DISABLED, GPUDirect Storage disabled by config on current file)\ CUFILE_OP(CUFILEOP_BASE_ERR + 35, CU_FILE_BATCH_SUBMIT_FAILED, failed to submit batch operation)\ CUFILE_OP(CUFILEOP_BASE_ERR + 36, CU_FILE_GPU_MEMORY_PINNING_FAILED, failed to allocate pinned GPU Memory) \ CUFILE_OP(CUFILEOP_BASE_ERR + 37, CU_FILE_BATCH_FULL, queue full for batch operation) \ CUFILE_OP(CUFILEOP_BASE_ERR + 38, CU_FILE_ASYNC_NOT_SUPPORTED, cuFile stream operation not supported) \ CUFILE_OP(CUFILEOP_BASE_ERR + 39, CU_FILE_IO_MAX_ERROR, GPUDirect Storage Max Error) /** * @brief cufileop status enum * * @note on success the error code is set to @ref CU_FILE_SUCCESS. * @note The error code can be inspected using @ref IS_CUFILE_ERR and @ref CUFILE_ERRSTR. * @note The error code if set to @ref CU_FILE_CUDA_DRIVER_ERROR, then cuda error can be inspected using @ref IS_CUDA_ERR and @ref CU_FILE_CUDA_ERR. * @note Data path errors are captured via standard error codes */ typedef enum CUfileOpError { /// @cond DOXYGEN_SKIP_MACRO #define CUFILE_OP(code, name, string) name = code, CUFILEOP_STATUS_ENTRIES #undef CUFILE_OP ///@endcond } CUfileOpError; /// @endcond /** * @brief cufileop status string */ static inline const char *cufileop_status_error(CUfileOpError status) { switch (status) { /// @cond DOXYGEN_SKIP_MACRO #define CUFILE_OP(code, name, string) \ case name: return #string; CUFILEOP_STATUS_ENTRIES #undef CUFILE_OP ///@endcond default:return "unknown cufile error"; } } /** * @brief cufileop status string */ typedef struct CUfileError { CUfileOpError err; // cufile error CUresult cu_err; // cuda driver error }CUfileError_t; /** * @brief error macros to inspect error status of type @ref CUfileOpError */ #define IS_CUFILE_ERR(err) \ (abs((err)) > CUFILEOP_BASE_ERR) #define CUFILE_ERRSTR(err) \ cufileop_status_error((CUfileOpError)abs((err))) #define IS_CUDA_ERR(status) \ ((status).err == CU_FILE_CUDA_DRIVER_ERROR) #define CU_FILE_CUDA_ERR(status) ((status).cu_err) /* driver properties */ typedef enum CUfileDriverStatusFlags { CU_FILE_LUSTRE_SUPPORTED = 0, /*!< Support for DDN LUSTRE */ CU_FILE_WEKAFS_SUPPORTED = 1, /*!< Support for WEKAFS */ CU_FILE_NFS_SUPPORTED = 2, /*!< Support for NFS */ CU_FILE_GPFS_SUPPORTED = 3, /*! < Support for GPFS */ CU_FILE_NVME_SUPPORTED = 4, /*!< Support for NVMe */ CU_FILE_NVMEOF_SUPPORTED = 5, /*!< Support for NVMeOF */ CU_FILE_SCSI_SUPPORTED = 6, /*!< Support for SCSI */ CU_FILE_SCALEFLUX_CSD_SUPPORTED = 7, /*!< Support for Scaleflux CSD*/ CU_FILE_NVMESH_SUPPORTED = 8, /*!< Support for NVMesh Block Dev*/ CU_FILE_BEEGFS_SUPPORTED = 9, /*!< Support for BeeGFS */ //10 is reserved for YRCloudFile CU_FILE_NVME_P2P_SUPPORTED = 11, /*!< Support for NVMe using PCI P2PDMA */ }CUfileDriverStatusFlags_t; typedef enum CUfileDriverControlFlags { CU_FILE_USE_POLL_MODE = 0 , /*!< use POLL mode. properties.use_poll_mode*/ CU_FILE_ALLOW_COMPAT_MODE = 1/*!< allow COMPATIBILITY mode. properties.allow_compat_mode*/ }CUfileDriverControlFlags_t; typedef enum CUfileFeatureFlags { CU_FILE_DYN_ROUTING_SUPPORTED = 0, /*!< Support for Dynamic routing to handle devices across the PCIe bridges */ CU_FILE_BATCH_IO_SUPPORTED = 1, /*!< Unsupported */ CU_FILE_STREAMS_SUPPORTED = 2, /*!< Unsupported */ CU_FILE_PARALLEL_IO_SUPPORTED = 3 /*!< Unsupported */ }CUfileFeatureFlags_t; typedef struct CUfileDrvProps { struct { unsigned int major_version; unsigned int minor_version; size_t poll_thresh_size; size_t max_direct_io_size; unsigned int dstatusflags; unsigned int dcontrolflags; } nvfs; unsigned int fflags; unsigned int max_device_cache_size; unsigned int per_buffer_cache_size; unsigned int max_device_pinned_mem_size; unsigned int max_batch_io_size; unsigned int max_batch_io_timeout_msecs; }CUfileDrvProps_t; typedef struct sockaddr sockaddr_t; typedef struct cufileRDMAInfo { int version; int desc_len; const char *desc_str; }cufileRDMAInfo_t; #define CU_FILE_RDMA_REGISTER 1 #define CU_FILE_RDMA_RELAXED_ORDERING (1<<1) typedef struct CUfileFSOps { /* NULL means discover using fstat */ const char* (*fs_type) (void *handle); /* list of host addresses to use, NULL means no restriction */ int (*getRDMADeviceList)(void *handle, sockaddr_t **hostaddrs); /* -1 no pref */ int (*getRDMADevicePriority)(void *handle, char*, size_t, loff_t, sockaddr_t* hostaddr); /* NULL means try VFS */ ssize_t (*read) (void *handle, char*, size_t, loff_t, cufileRDMAInfo_t*); ssize_t (*write) (void *handle, const char *, size_t, loff_t , cufileRDMAInfo_t*); }CUfileFSOps_t; /* File Handle */ enum CUfileFileHandleType { CU_FILE_HANDLE_TYPE_OPAQUE_FD = 1, /*!< Linux based fd */ CU_FILE_HANDLE_TYPE_OPAQUE_WIN32 = 2, /*!< Windows based handle (unsupported) */ CU_FILE_HANDLE_TYPE_USERSPACE_FS = 3, /* Userspace based FS */ }; typedef struct CUfileDescr_t { enum CUfileFileHandleType type; /* type of file being registered */ union { int fd; /* Linux */ void *handle; /* Windows */ } handle; const CUfileFSOps_t *fs_ops; /* file system operation table */ }CUfileDescr_t; /** * @brief File handle type * */ typedef void* CUfileHandle_t; #pragma GCC visibility push(default) /** * @brief cuFileHandleRegister is required, and performs extra checking that is memoized to provide increased performance on later cuFile operations. * * @param fh @ref CUfileHandle_t opaque file handle for IO operations * @param descr @ref CUfileDescr_t file descriptor (OS agnostic) * * @return CU_FILE_SUCCESS on successful completion. fh will be updated for use in @ref cuFileRead, @ref cuFileWrite, @ref cuFileHandleDeregister * @return CU_FILE_DRIVER_NOT_INITIALIZED on failure to load driver * @return CU_FILE_IO_NOT_SUPPORTED - if filesystem is not supported * @return CU_FILE_INVALID_VALUE if null or bad api arguments * @return CU_FILE_INVALID_FILE_OPEN_FLAG if file is opened with unsupported modes like no O_DIRECT * @return CU_FILE_INVALID_FILE_TYPE if filepath is not valid or is not a regular file * @return CU_FILE_HANDLE_ALREADY_REGISTERED if file handle/descriptor is already registered * * Description * cuFileHandleRegister registers the open file descriptor for use with cuFile IO operations. * * This API will ensure that the file’s descriptor is checked for GPUDirect Storage support and returns a valid file handle on CU_FILE_SUCCESS. * * @note the file needs to be opened in O_DIRECT mode to support GPUDirect Storage. * * @see cuFileRead * @see cuFileWrite * @see cuFileHandleDeregister * */ CUfileError_t cuFileHandleRegister(CUfileHandle_t *fh, CUfileDescr_t *descr); /** * @brief releases a registered filehandle from cuFile * * @param fh @ref CUfileHandle_t file handle * * @return void * * @see cuFileHandleRegister */ void cuFileHandleDeregister(CUfileHandle_t fh); /** * @brief register an existing cudaMalloced memory with cuFile to pin for GPUDirect Storage access or * register host allocated memory with cuFile. * * @param bufPtr_base buffer pointer allocated * @param length size of memory region from the above specified bufPtr * @param flags CU_FILE_RDMA_REGISTER * * @return CU_FILE_SUCCESS on success * @return CU_FILE_NVFS_DRIVER_ERROR * @return CU_FILE_INVALID_VALUE * @return CU_FILE_CUDA_ERROR for unsuported memory type * @return CU_FILE_MEMORY_ALREADY_REGISTERED on error * @return CU_FILE_GPU_MEMORY_PINNING_FAILED if not enough pinned memory is available * @note This memory will be use to perform GPU direct DMA from the supported storage. * @warning This API is intended for usecases where the memory is used as streaming buffer that is reused across multiple cuFile IO operations before calling @ref cuFileBufDeregister * * @see cuFileBufDeregister * @see cuFileRead * @see cuFileWrite */ CUfileError_t cuFileBufRegister(const void *bufPtr_base, size_t length, int flags); /** * @brief deregister an already registered device or host memory from cuFile * * @param bufPtr_base buffer pointer to deregister * * @return CU_FILE_SUCCESS on success * @return CU_FILE_INVALID_VALUE on invalid memory pointer or unregistered memory pointer * * @see cuFileBufRegister * @see cuFileRead * @see cuFileWrite */ CUfileError_t cuFileBufDeregister(const void *bufPtr_base); /** * @brief read data from a registered file handle to a specified device or host memory * * @param fh @ref CUfileHandle_t opaque file handle * @param bufPtr_base base address of buffer in device or host memory * @param size size bytes to read * @param file_offset file-offset from begining of the file * @param bufPtr_offset offset relative to the bufPtr_base pointer to read into. * * @return size of bytes successfully read * @return -1 on error, in which case errno is set to indicate filesystem errors. * @return all other errors will return a negative integer value of @ref CUfileOpError enum value. * * @note If the bufPtr is not registered with @ref cuFileBufRegister, the data will be buffered through preallocated pinned buffers if needed. * @note This is useful for applications that need to perform IO to unaligned file offsets and/or size. This is also recommended * for cases where the BAR1 memory size is smaller than the size of the allocated memory. * * @see cuFileBufRegister * @see cuFileHandleRegister * @see cuFileWrite */ ssize_t cuFileRead(CUfileHandle_t fh, void *bufPtr_base, size_t size, off_t file_offset, off_t bufPtr_offset); /** * @brief write data from a specified device or host memory to a registered file handle * * @param fh @ref CUfileHandle_t opaque file handle * @param bufPtr_base base address of buffer in device or host memory * @param size size bytes to write * @param file_offset file-offset from begining of the file * @param bufPtr_offset offset relative to the bufPtr_base pointer to write from. * * @return size of bytes successfully written * @return -1 on error, in which case errno is set to indicate filesystem errors. * @return all other errors will return a negative integer value of @ref CUfileOpError enum value. * * @note If the bufPtr is not registered with @ref cuFileBufRegister, the data will be buffered through preallocated pinned buffers if needed. * @note This is useful for applications that need to perform IO to unaligned file offsets and/or size. This is also recommended * for cases where the BAR1 memory size is smaller than the size of the allocated memory. * * @see cuFileBufRegister * @see cuFileHandleRegister * @see cuFileRead */ ssize_t cuFileWrite(CUfileHandle_t fh, const void *bufPtr_base, size_t size, off_t file_offset, off_t bufPtr_offset); // CUFile Driver APIs /** * @brief * Initialize the cuFile library and open the nvidia-fs driver * * @return CU_FILE_SUCCESS on success * @return CU_FILE_DRIVER_NOT_INITIALIZED * @return CU_FILE_DRIVER_VERSION_MISMATCH on driver version mismatch error * * @see cuFileDriverClose */ CUfileError_t cuFileDriverOpen(void); CUfileError_t cuFileDriverClose(void); #define cuFileDriverClose cuFileDriverClose_v2 /** * @brief * reset the cuFile library and release the nvidia-fs driver * * @return CU_FILE_SUCCESS on success * @return CU_FILE_DRIVER_CLOSING if there are any active IO operations using @ref cuFileRead or @ref cuFileWrite * * @see cuFileDriverOpen */ CUfileError_t cuFileDriverClose(void); /** * @brief * returns use count of cufile drivers at that moment by the process. */ long cuFileUseCount(void); /** * @brief * Gets the Driver session properties * * @return CU_FILE_SUCCESS on success * * @see cuFileDriverSetPollMode * @see cuFileDriverSetMaxDirectIOSize * @see cuFileDriverSetMaxCacheSize * @see cuFileDriverSetMaxPinnedMemSize */ CUfileError_t cuFileDriverGetProperties(CUfileDrvProps_t *props); /** * @brief * Sets whether the Read/Write APIs use polling to do IO operations * * @param poll boolean to indicate whether to use poll mode or not * @param poll_threshold_size max IO size to use for POLLING mode in KB * * @return CU_FILE_SUCCESS on success * @return CU_FILE_DRIVER_NOT_INITIALIZED if the driver is not initialized * @return CU_FILE_DRIVER_VERSION_MISMATCH, CU_FILE_DRIVER_UNSUPPORTED_LIMIT on error * * @warning This is an advanced command and should be tuned based on available system memory * * @see cuFileDriverGetProperties */ CUfileError_t cuFileDriverSetPollMode(bool poll, size_t poll_threshold_size); /** * @brief * Control parameter to set max IO size(KB) used by the library to talk to nvidia-fs driver * * @param max_direct_io_size maximum allowed direct io size in KB * * @return CU_FILE_SUCCESS on success * @return CU_FILE_DRIVER_NOT_INITIALIZED if the driver is not initialized * @return CU_FILE_DRIVER_VERSION_MISMATCH, CU_FILE_DRIVER_UNSUPPORTED_LIMIT on error * * @warning This is an advanced command and should be tuned based on available system memory * * @see cuFileDriverGetProperties * */ CUfileError_t cuFileDriverSetMaxDirectIOSize(size_t max_direct_io_size); /** * @brief * Control parameter to set maximum GPU memory reserved per device by the library for internal buffering * * @param max_cache_size The maximum GPU buffer space per device used for internal use in KB * * @return CU_FILE_SUCCESS on success * @return CU_FILE_DRIVER_NOT_INITIALIZED if the driver is not initialized * @return CU_FILE_DRIVER_VERSION_MISMATCH, CU_FILE_DRIVER_UNSUPPORTED_LIMIT on error * * @warning This is an advanced command and should be tuned based on supported GPU memory * * @see cuFileDriverGetProperties */ CUfileError_t cuFileDriverSetMaxCacheSize(size_t max_cache_size); /** * @brief * Sets maximum buffer space that is pinned in KB for use by @ref cuFileBufRegister * * @param max_pinned_size maximum buffer space that is pinned in KB * * @return CU_FILE_SUCCESS on success * @return CU_FILE_DRIVER_NOT_INITIALIZED if the driver is not initialized * @return CU_FILE_DRIVER_VERSION_MISMATCH, CU_FILE_DRIVER_UNSUPPORTED_LIMIT on error * * @warning This is an advanced command and should be tuned based on supported GPU memory * * @see cuFileDriverGetProperties * */ CUfileError_t cuFileDriverSetMaxPinnedMemSize(size_t max_pinned_size); //Experimental Batch API's typedef enum CUfileOpcode { CUFILE_READ = 0, CUFILE_WRITE }CUfileOpcode_t; typedef enum CUFILEStatus_enum { CUFILE_WAITING = 0x000001, /* required value prior to submission */ CUFILE_PENDING = 0x000002, /* once enqueued */ CUFILE_INVALID = 0x000004, /* request was ill-formed or could not be enqueued */ CUFILE_CANCELED = 0x000008, /* request successfully canceled */ CUFILE_COMPLETE = 0x0000010, /* request successfully completed */ CUFILE_TIMEOUT = 0x0000020, /* request timed out */ CUFILE_FAILED = 0x0000040 /* unable to complete */ }CUfileStatus_t; typedef enum cufileBatchMode { CUFILE_BATCH = 1, } CUfileBatchMode_t; typedef struct CUfileIOParams { CUfileBatchMode_t mode; // Must be the very first field. union { struct { void *devPtr_base; //This can be a device memory or a host memory pointer. off_t file_offset; off_t devPtr_offset; size_t size; }batch; }u; CUfileHandle_t fh; CUfileOpcode_t opcode; void *cookie; }CUfileIOParams_t; typedef struct CUfileIOEvents { void *cookie; CUfileStatus_t status; /* status of the operation */ size_t ret; /* -ve error or amount of I/O done. */ }CUfileIOEvents_t; typedef void* CUfileBatchHandle_t; CUfileError_t cuFileBatchIOSetUp(CUfileBatchHandle_t *batch_idp, unsigned nr); CUfileError_t cuFileBatchIOSubmit(CUfileBatchHandle_t batch_idp, unsigned nr, CUfileIOParams_t *iocbp, unsigned int flags); CUfileError_t cuFileBatchIOGetStatus(CUfileBatchHandle_t batch_idp, unsigned min_nr, unsigned* nr, CUfileIOEvents_t *iocbp, struct timespec* timeout); CUfileError_t cuFileBatchIOCancel(CUfileBatchHandle_t batch_idp); void cuFileBatchIODestroy(CUfileBatchHandle_t batch_idp); //Async API's with cuda streams // cuFile stream API registration flags // buffer pointer offset is set at submission time #define CU_FILE_STREAM_FIXED_BUF_OFFSET 1 // file offset is set at submission time #define CU_FILE_STREAM_FIXED_FILE_OFFSET 2 // file size is set at submission time #define CU_FILE_STREAM_FIXED_FILE_SIZE 4 // size, offset and buffer offset are 4k aligned #define CU_FILE_STREAM_PAGE_ALIGNED_INPUTS 8 /** *@brief * @param fh The cuFile handle for the file. * @param bufPtr_base base address of buffer in device or host memory * @param size_p pointer to size bytes to read * @note *size_p if the size is not known at the time of submission, then must provide the max possible size for I/O request. * @param file_offset_p pointer to file-offset from begining of the file * @param bufPtr_offset_p pointer to offset relative to the bufPtr_base pointer to read into. * @param bytes_read_p pointer to the number of bytes that were successfully read. * @param CUstream stream cuda stream for the operation. * * @return size of bytes successfully read in *bytes_read_p * @return -1 on error, in which case errno is set to indicate filesystem errors. * @return all other errors will return a negative integer value of @ref CUfileOpError enum value. * * @note If the bufPtr_base is not registered with @ref cuFileBufRegister, the data will be buffered through preallocated pinned buffers. * @note This is useful for applications that need to perform IO to unaligned file offsets and/or size. This is also recommended * for cases where the BAR1 memory size is smaller than the size of the allocated memory. * @note If the stream is registered with cuFileStreamRegister, the IO setup and teardown overhead will be reduced. * @note on cuda stream errors, the user must call cuFileStreamDeregister to release any outstanding cuFile resources for the stream. * * * @see cuFileBufRegister * @see cuFileHandleRegister * @see cuFileRead * @see cuFileStreamRegister * @see cuFileStreamDeregister */ CUfileError_t cuFileReadAsync(CUfileHandle_t fh, void *bufPtr_base, size_t *size_p, off_t *file_offset_p, off_t *bufPtr_offset_p, ssize_t *bytes_read_p, CUstream stream); /** *@brief * @param fh The cuFile handle for the file. * @param bufPtr_base base address of buffer in device or host memory * @param size_p pointer to size bytes to write. * @note *size_p if the size is not known at the time of submission, then must provide the max possible size for I/O request. * @param file_offset_p pointer to file-offset from begining of the file * @param bufPtr_offset_p pointer to offset relative to the bufPtr_base pointer to write from. * @param bytes_written_p pointer to the number of bytes that were successfully written. * @param CUstream cuda stream for the operation. * * @return size of bytes successfully written in *bytes_written_p * @return -1 on error, in which case errno is set to indicate filesystem errors. * @return all other errors will return a negative integer value of @ref CUfileOpError enum value. * * @note If the bufPtr_base is not registered with @ref cuFileBufRegister, the data will be buffered through preallocated pinned buffers. * @note This is useful for applications that need to perform IO to unaligned file offsets and/or size. This is also recommended * for cases where the BAR1 memory size is smaller than the size of the allocated memory. * @note If the stream is registered with cuFileStreamRegister prior to this call, the IO setup and teardown overhead will be reduced. * @note on cuda stream errors, the user must call cuFileStreamDeregister to release any outstanding cuFile resources for the stream. * * @see cuFileBufRegister * @see cuFileHandleRegister * @see cuFileWrite * @see cuFileStreamRegister * @see cuFileStreamDeregister */ CUfileError_t cuFileWriteAsync(CUfileHandle_t fh, void *bufPtr_base, size_t *size_p, off_t *file_offset_p, off_t *bufPtr_offset_p, ssize_t *bytes_written_p, CUstream stream); /** *@brief * @param CUstream cuda stream for the operation. * @param flags for the stream to improve the stream execution of IO based on input parameters. * @note supported FLAGS are * @note CU_FILE_STREAM_FIXED_BUF_OFFSET - buffer pointer offset is set at submission time * @note CU_FILE_STREAM_FIXED_FILE_OFFSET - file offset is set at submission time * @note CU_FILE_STREAM_FIXED_FILE_SIZE - file size is set at submission time * @note CU_FILE_STREAM_PAGE_ALIGNED_INPUTS - size, offset and buffer offset are 4k aligned * * @note allocates resources needed to support cuFile operations asynchronously for the cuda stream * @note This is useful for applications that need to perform IO to unaligned file offsets and/or size. This is also recommended * for cases where the BAR1 memory size is smaller than the size of the allocated memory. * * @return CU_FILE_SUCCESS on success * @return CU_FILE_DRIVER_NOT_INITIALIZED if the driver is not initialized * @return CU_FILE_INVALID_VALUE if the stream is invalid * * @see cuFileReadAsync * @see cuFileWriteAsync * @see cuFileStreamDeregister */ CUfileError_t cuFileStreamRegister(CUstream stream, unsigned flags); /** *@brief * @param CUstream cuda stream for the operation. * * @note deallocates resources used by previous cuFile asynchronous operations for the cuda stream * @note highly recommend to call after cuda stream errors to release any outstanding cuFile resources for this stream * @note must be called before cuStreamDestroy call for the specified stream. * @note This is useful for applications that need to perform IO to unaligned file offsets and/or size. This is also recommended * for cases where the BAR1 memory size is smaller than the size of the allocated memory. * * @return CU_FILE_SUCCESS on success * @return CU_FILE_DRIVER_NOT_INITIALIZED if the driver is not initialized * @return CU_FILE_INVALID_VALUE if the stream is invalid * * @see cuFileReadAsync * @see cuFileWriteAsync * @see cuFileStreamRegister */ CUfileError_t cuFileStreamDeregister(CUstream stream); /** *@brief * @returns cufile library version. * * @The version is returned as (1000 major + 10 minor). * @For example, CUFILE 1.7.0 would be represented by 1070. * @note This is useful for applications that need to inquire the library. * * @return CU_FILE_SUCCESS on success * @return CU_FILE_INVALID_VALUE if the input parameter is null. * @return CU_FILE_DRIVER_VERSION_READ_ERROR if the version is not available. * */ CUfileError_t cuFileGetVersion(int *version); #pragma GCC visibility pop /// @cond DOXYGEN_SKIP_MACRO #endif // CUFILE_H /// @endcond #ifdef __cplusplus } #endif