xref: /freebsd-10.1-release/sys/dev/isci/scil/scif_io_request.h

/*-
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 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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 * it under the terms of version 2 of the GNU General Public License as
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 * You should have received a copy of the GNU General Public License
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 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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#ifndef _SCIF_IO_REQUEST_H_
#define _SCIF_IO_REQUEST_H_

/**
 * @file
 *
 * @brief This file contains the structures and interface methods that
 *        can be referenced and used by the SCI user for the SCI IO request
 *        object.
 */

#ifdef __cplusplus
extern "C" {
#endif // __cplusplus

#include <dev/isci/scil/sci_types.h>
#include <dev/isci/scil/sci_status.h>


/**
 * @brief This method simply returns the size required to construct an SCI
 *        based IO request object (includes core & framework object size).
 *
 * @return Return the size of the SCI IO request object.
 */
U32 scif_io_request_get_object_size(
   void
);

/**
* @brief This method simply the number of data bytes transfered for a
*        STP or SSP io request.
*
* @param[in] scif_io_request This parameter specifies the framework IO
*            handle to retrieve the number of data bytes transferred.
*
* @return Return the number of data bytes transfered by the io request
*/
U32 scif_io_request_get_number_of_bytes_transferred(
   void * scif_io_request
);

/**
 * @brief This method is called by the SCIF user to construct an IO request.
 *        This method will construct a SCIC IO request internally.  The memory
 *        for the core IO request is passed as a parameter to this method.
 *
 * @note  The SCI framework implementation will create an association between
 *        the user IO request object and the framework IO request object.
 *
 * @param[in]  scif_controller the handle to the framework controller object
 *             for which to build an IO request.
 * @param[in]  scif_remote_device This parameter specifies the framework
 *             remote device with which this IO request is to be associated.
 * @param[in]  io_tag This parameter specifies the IO tag to be associated
 *             with this request.  If SCI_CONTROLLER_INVALID_IO_TAG is
 *             passed, then a copy of the request is built internally.  The
 *             request will be copied into the actual controller request
 *             memory when the IO tag is allocated internally during the
 *             scif_controller_start_io() method.
 * @param[in]  user_io_request_object This parameter specifies the user
 *             IO request to be utilized during IO construction.  This IO
 *             pointer will become the associated object for the framework
 *             IO request object.
 * @param[in]  io_request_memory This parameter specifies the memory
 *             to be utilized in the construction of the framework IO request.
 * @param[in]  scif_io_request This parameter specifies the handle to be
 *             utilized for all further interactions with this IO request
 *             object.
 *
 * @return Indicate if the controller successfully built the IO request.
 * @retval SCI_SUCCESS This value is returned if the IO request was
 *         successfully built.
 */
SCI_STATUS scif_io_request_construct(
   SCI_CONTROLLER_HANDLE_T      scif_controller,
   SCI_REMOTE_DEVICE_HANDLE_T   scif_remote_device,
   U16                          io_tag,
   void                       * user_io_request_object,
   void                       * io_request_memory,
   SCI_IO_REQUEST_HANDLE_T    * scif_io_request
);

/**
 * @brief This method simply returns the SCI Core object handle that is
 *        associated with the supplied SCI Framework object.
 *
 * @param[in]  scif_io_request This parameter specifies the framework IO
 *             for which to return the associated core IO request object.
 *
 * @return This method returns a handle to the core IO request object
 *         associated with the framework IO request object.
 * @retval SCI_INVALID_HANDLE This return value indicates that the SCI Core
 *         IO request handle for the supplied framework IO is invalid.
 */
SCI_IO_REQUEST_HANDLE_T scif_io_request_get_scic_handle(
   SCI_IO_REQUEST_HANDLE_T scif_io_request
);

/**
 * @brief This method returns the address of the response information unit.
 *        This call is only valid if the completion status for the io request
 *        is SCI_FAILURE_IO_RESPONSE_VALID.
 *
 * @param[in]  scif_io_request This parameter specifies the framework IO
 *             for which to return the associated core IO request object.
 *
 * @return The address for the response information unit.
 */
void * scif_io_request_get_response_iu_address(
   SCI_IO_REQUEST_HANDLE_T scif_io_request
);

/**
 * @brief This method will build an Framework SSP Passthrough IO request based
 *        on the user information supplied in the pass-through IO request object.
 *        In case of pass through request construction, the driver creates the
 *        sci core request object and pass that to the framework
 *
 * @pre
 *
 * @param[in]  scif_controller. Not used in the function but kept to maintain uniformity
 *             with other io construct functions
 * @param[in]  scif_remote_device. This parameter is the device.
 * @param[in]  scic_io_request. This parameter is the scic request already constructed
 * @param[in]  user_io_request_object, the user io request
 * @param[in]  io_request_memory, the scif offset in the user_io_request_object.
 *
 * @param[out]  the contructed scif request. This points to the same location as io_request_memory
 *
 * @return Indicate if framework IO request is successfully built.
 * @retval SCI_SUCCESS This value is returned if the IO request was
 *         successfully built.
 */
SCI_STATUS scif_io_request_construct_with_core (
   SCI_CONTROLLER_HANDLE_T      scif_controller,
   SCI_REMOTE_DEVICE_HANDLE_T   scif_remote_device,
   void                       * scic_io_request,
   void                       * user_io_request_object,
   void                       * io_request_memory,
   SCI_IO_REQUEST_HANDLE_T    * scif_io_request
);

/**
 * @brief This method will build the basic scif and scic io request object based
 *        on the user information supplied in the pass-through IO request object.
 *        This function will not build the protocol specific part of the request
 *        but set up the memory areas of scif and scic set the association.
 *
 * @pre
 *
 * @param[in]  scif_controller the handle to the framework controller object
 *             for which to build an IO request.
 * @param[in]  scif_remote_device This parameter specifies the framework
 *             remote device with which this IO request is to be associated.
 * @param[in]  io_tag This parameter specifies the IO tag to be associated
 *             with this request.  If SCI_CONTROLLER_INVALID_IO_TAG is
 *             passed, then a copy of the request is built internally.  The
 *             request will be copied into the actual controller request
 *             memory when the IO tag is allocated internally during the
 *             scif_controller_start_io() method.
 * @param[in]  user_io_request_object This parameter specifies the user
 *             IO request to be utilized during IO construction.  This IO
 *             pointer will become the associated object for the framework
 *             IO request object.
 * @param[in]  io_request_memory This parameter specifies the memory
 *             to be utilized in the construction of the framework IO request.
 * @param[in]  scif_io_request This parameter specifies the handle to be
 *             utilized for all further interactions with this IO request
 *             object.
 *
 * @return Indicate if the controller successfully built the IO request.
 * @retval SCI_SUCCESS This value is returned if the IO request was
 *         successfully built.
 */
SCI_STATUS scif_request_construct(
   SCI_CONTROLLER_HANDLE_T      scif_controller,
   SCI_REMOTE_DEVICE_HANDLE_T   scif_remote_device,
   U16                          io_tag,
   void                       * user_io_request_object,
   void                       * io_request_memory,
   SCI_IO_REQUEST_HANDLE_T    * scif_io_request
);

#ifdef __cplusplus
}
#endif // __cplusplus

#endif // _SCIF_IO_REQUEST_H_