xref: /freebsd-10.0-release/sys/dev/isci/scil/scic_task_request.h

/*-
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 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
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#ifndef _SCIC_TASK_REQUEST_H_
#define _SCIC_TASK_REQUEST_H_

/**
 * @file
 *
 * @brief This file contains the structures and interface methods that
 *        can be referenced and used by the SCI user for to utilize
 *        task management requests.
 */

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

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

#if !defined(DISABLE_TASK_MANAGEMENT)

/**
 * @brief This method simply returns the size required to build an SCI
 *        based task managment request object.
 *
 * @return Return the size of the SCIC task request object.
 */
U32 scic_task_request_get_object_size(
   void
);

/**
 * @brief This method is called by the SCI user to construct all SCI Core
 *        task management requests, regardless of protocol.  Memory
 *        initialization and functionality common to all task request types
 *        is performed in this method.
 *
 * @note  The SCI core implementation will create an association between
 *        the user task request object and the core task request object.
 *
 * @param[in]  scic_controller the handle to the core controller object
 *             for which to build the task managmement request.
 * @param[in]  scic_remote_device the handle to the core remote device
 *             object for which to build the task management request.
 *             passed, then a copy of the request is built internally.  The
 *             request will be copied into the actual controller request
 *             memory when the task is allocated internally during the
 *             scic_controller_start_task() method.
 * @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
 *             scic_controller_start_io() method.
 * @param[in]  user_task_request_object This parameter specifies the user
 *             task request to be utilized during construction.  This task
 *             pointer will become the associated object for the core
 *             task request object.
 * @param[in]  scic_task_request_memory This parameter specifies the memory
 *             location to be utilized when building the core request.
 * @param[out] new_scic_task_request_handle This parameter specifies a
 *             pointer to the handle the core will expect in further
 *             interactions with the core task request object.
 *
 * @return Indicate if the controller successfully built the task request.
 * @retval SCI_SUCCESS This value is returned if the task request was
 *         successfully built.
 */
SCI_STATUS scic_task_request_construct(
   SCI_CONTROLLER_HANDLE_T      scic_controller,
   SCI_REMOTE_DEVICE_HANDLE_T   scic_remote_device,
   U16                          io_tag,
   void                       * user_task_request_object,
   void                       * scic_task_request_memory,
   SCI_TASK_REQUEST_HANDLE_T  * new_scic_task_request_handle
);

/**
 * @brief This method is called by the SCI user to construct all SCI Core
 *        SSP task management requests.  Memory initialization and
 *        functionality common to all task request types is performed in
 *        this method.
 *
 * @param[out] scic_task_request This parameter specifies the handle
 *             to the core task request object for which to construct
 *             a SATA specific task management request.
 *
 * @return Indicate if the controller successfully built the task request.
 * @retval SCI_SUCCESS This value is returned if the task request was
 *         successfully built.
 */
SCI_STATUS scic_task_request_construct_ssp(
   SCI_TASK_REQUEST_HANDLE_T  scic_task_request
);

/**
 * @brief This method is called by the SCI user to construct all SCI Core
 *        SATA task management requests.  Memory initialization and
 *        functionality common to all task request types is performed in
 *        this method.
 *
 * @param[out] scic_task_request_handle This parameter specifies the
 *             handle to the core task request object for which to construct
 *             a SATA specific task management request.
 *
 * @return Indicate if the controller successfully built the task request.
 * @retval SCI_SUCCESS This value is returned if the task request was
 *         successfully built.
 */
SCI_STATUS scic_task_request_construct_sata(
   SCI_TASK_REQUEST_HANDLE_T  scic_task_request_handle
);

#else // !defined(DISABLE_TASK_MANAGEMENT)

#define scic_task_request_get_object_size() 0
#define scic_task_request_construct(controller, dev, tag, task, mem, handle) \
        SCI_FAILURE
#define scic_task_request_construct_ssp(task) SCI_FAILURE
#define scic_task_request_construct_sata(task) SCI_FAILURE

#endif // !defined(DISABLE_TASK_MANAGEMENT)

#ifdef __cplusplus
}
#endif // __cplusplus

#endif // _SCIC_TASK_REQUEST_H_