FreeBSD/Linux Kernel Cross Reference
sys/dev/isci/isci_task_request.c

     /*-
      * BSD LICENSE
      *
      * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
     *
     *   * Redistributions of source code must retain the above copyright
     *     notice, this list of conditions and the following disclaimer.
     *   * Redistributions in binary form must reproduce the above copyright
     *     notice, this list of conditions and the following disclaimer in
     *     the documentation and/or other materials provided with the
     *     distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/8.4/sys/dev/isci/isci_task_request.c 231688 2012-02-14 15:56:01Z jimharris $");
    
    #include <dev/isci/isci.h>
    
    #include <dev/isci/scil/scif_controller.h>
    #include <dev/isci/scil/scif_user_callback.h>
    
    /**
     * @brief This user callback will inform the user that a task management
     *        request completed.
     *
     * @param[in]  controller This parameter specifies the controller on
     *             which the task management request is completing.
     * @param[in]  remote_device This parameter specifies the remote device on
     *             which this task management request is completing.
     * @param[in]  task_request This parameter specifies the task management
     *             request that has completed.
     * @param[in]  completion_status This parameter specifies the results of
     *             the IO request operation.  SCI_TASK_SUCCESS indicates
     *             successful completion.
     *
     * @return none
     */
    void
    scif_cb_task_request_complete(SCI_CONTROLLER_HANDLE_T controller,
        SCI_REMOTE_DEVICE_HANDLE_T remote_device,
        SCI_TASK_REQUEST_HANDLE_T task_request, SCI_TASK_STATUS completion_status)
    {
    
            scif_controller_complete_task(controller, remote_device, task_request);
            isci_task_request_complete(controller, remote_device, task_request,
                completion_status);
    }
    
    /**
     * @brief This method returns the Logical Unit to be utilized for this
     *        task management request.
     *
     * @note The contents of the value returned from this callback are defined
     *       by the protocol standard (e.g. T10 SAS specification).  Please
     *       refer to the transport task information unit description
     *       in the associated standard.
     *
     * @param[in] scif_user_task_request This parameter points to the user's
     *            task request object.  It is a cookie that allows the user to
     *            provide the necessary information for this callback.
     *
     * @return This method returns the LUN associated with this request.
     * @todo This should be U64?
     */
    uint32_t
    scif_cb_task_request_get_lun(void * scif_user_task_request)
    {
    
            /* Currently we are only doing hard resets, not LUN resets.  So
             *  always returning 0 is OK here, since LUN doesn't matter for
             *  a hard device reset.
             */
            return (0);
    }
    
    /**
     * @brief This method returns the task management function to be utilized
     *        for this task request.
     *
     * @note The contents of the value returned from this callback are defined
     *       by the protocol standard (e.g. T10 SAS specification).  Please
     *       refer to the transport task information unit description
    *       in the associated standard.
    *
    * @param[in] scif_user_task_request This parameter points to the user's
    *            task request object.  It is a cookie that allows the user to
    *            provide the necessary information for this callback.
    *
    * @return This method returns an unsigned byte representing the task
    *         management function to be performed.
    */
   uint8_t scif_cb_task_request_get_function(void * scif_user_task_request)
   {
           /* SCIL supports many types of task management functions, but this
            *  driver only uses HARD_RESET.
            */
           return (SCI_SAS_HARD_RESET);
   }
   
   /**
    * @brief This method returns the task management IO tag to be managed.
    *        Depending upon the task management function the value returned
    *        from this method may be ignored.
    *
    * @param[in] scif_user_task_request This parameter points to the user's
    *            task request object.  It is a cookie that allows the user to
    *            provide the necessary information for this callback.
    *
    * @return This method returns an unsigned 16-bit word depicting the IO
    *         tag to be managed.
    */
   uint16_t
   scif_cb_task_request_get_io_tag_to_manage(void * scif_user_task_request)
   {
   
           return (0);
   }
   
   /**
    * @brief This callback method asks the user to provide the virtual
    *        address of the response data buffer for the supplied IO request.
    *
    * @param[in] scif_user_task_request This parameter points to the user's
    *            task request object.  It is a cookie that allows the user to
    *            provide the necessary information for this callback.
    *
    * @return This method returns the virtual address for the response data buffer
    *         associated with this IO request.
    */
   void *
   scif_cb_task_request_get_response_data_address(void * scif_user_task_request)
   {
           struct ISCI_TASK_REQUEST *task_request =
               (struct ISCI_TASK_REQUEST *)scif_user_task_request;
   
           return (&task_request->sense_data);
   }
   
   /**
    * @brief This callback method asks the user to provide the length of the
    *        response data buffer for the supplied IO request.
    *
    * @param[in] scif_user_task_request This parameter points to the user's
    *            task request object.  It is a cookie that allows the user to
    *            provide the necessary information for this callback.
    *
    * @return This method returns the length of the response buffer data
    *         associated with this IO request.
    */
   uint32_t
   scif_cb_task_request_get_response_data_length(void * scif_user_task_request)
   {
   
           return (sizeof(struct scsi_sense_data));
   }
   
   void
   isci_task_request_complete(SCI_CONTROLLER_HANDLE_T scif_controller,
       SCI_REMOTE_DEVICE_HANDLE_T remote_device,
       SCI_TASK_REQUEST_HANDLE_T task_request, SCI_TASK_STATUS completion_status)
   {
           struct ISCI_TASK_REQUEST *isci_task_request =
                   (struct ISCI_TASK_REQUEST *)sci_object_get_association(task_request);
           struct ISCI_CONTROLLER *isci_controller =
                   (struct ISCI_CONTROLLER *)sci_object_get_association(scif_controller);
           struct ISCI_REMOTE_DEVICE *isci_remote_device =
                   (struct ISCI_REMOTE_DEVICE *)sci_object_get_association(remote_device);
           struct ISCI_REMOTE_DEVICE *pending_remote_device;
           BOOL retry_task = FALSE;
           union ccb *ccb = isci_task_request->ccb;
   
           isci_remote_device->is_resetting = FALSE;
   
           switch (completion_status) {
           case SCI_TASK_SUCCESS:
           case SCI_TASK_FAILURE_RESPONSE_VALID:
                   break;
   
           case SCI_TASK_FAILURE_INVALID_STATE:
           case SCI_TASK_FAILURE_INSUFFICIENT_RESOURCES:
           case SCI_FAILURE_TIMEOUT:
                   retry_task = TRUE;
                   isci_log_message(0, "ISCI",
                       "unhandled task completion code 0x%x\n", completion_status);
                   break;
   
           case SCI_TASK_FAILURE:
           case SCI_TASK_FAILURE_UNSUPPORTED_PROTOCOL:
           case SCI_TASK_FAILURE_INVALID_TAG:
           case SCI_TASK_FAILURE_CONTROLLER_SPECIFIC_ERR:
           case SCI_TASK_FAILURE_TERMINATED:
           case SCI_TASK_FAILURE_INVALID_PARAMETER_VALUE:
                   isci_log_message(0, "ISCI",
                       "unhandled task completion code 0x%x\n", completion_status);
                   break;
   
           default:
                   isci_log_message(0, "ISCI",
                       "unhandled task completion code 0x%x\n", completion_status);
                   break;
           }
   
           if (isci_controller->is_frozen == TRUE) {
                   isci_controller->is_frozen = FALSE;
                   xpt_release_simq(isci_controller->sim, TRUE);
           }
   
           sci_pool_put(isci_controller->request_pool,
               (struct ISCI_REQUEST *)isci_task_request);
   
           /* Make sure we release the device queue, since it may have been frozen
            *  if someone tried to start an I/O while the task was in progress.
            */
           isci_remote_device_release_device_queue(isci_remote_device);
   
           if (retry_task == TRUE)
                   isci_remote_device_reset(isci_remote_device, ccb);
           else {
                   pending_remote_device = sci_fast_list_remove_head(
                       &isci_controller->pending_device_reset_list);
   
                   if (pending_remote_device != NULL) {
                           /* Any resets that were triggered from an XPT_RESET_DEV
                            *  CCB are never put in the pending list if the request
                            *  pool is empty - they are given back to CAM to be
                            *  requeued.  So we will alawys pass NULL here,
                            *  denoting that there is no CCB associated with the
                            *  device reset.
                            */
                           isci_remote_device_reset(pending_remote_device, NULL);
                   } else if (ccb != NULL) {
                           /* There was a CCB associated with this reset, so mark
                            *  it complete and return it to CAM.
                            */
                           ccb->ccb_h.status &= ~CAM_STATUS_MASK;
                           ccb->ccb_h.status |= CAM_REQ_CMP;
                           xpt_done(ccb);
                   }
           }
   }
   

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