FreeBSD/Linux Kernel Cross Reference
sys/dev/isci/isci_io_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_io_request.c 244129 2012-12-12 00:39:32Z jimharris $");
    
    #include <dev/isci/isci.h>
    
    #include <cam/scsi/scsi_all.h>
    #include <cam/scsi/scsi_message.h>
    
    #include <dev/isci/scil/intel_sas.h>
    
    #include <dev/isci/scil/sci_util.h>
    
    #include <dev/isci/scil/scif_io_request.h>
    #include <dev/isci/scil/scif_controller.h>
    #include <dev/isci/scil/scif_remote_device.h>
    #include <dev/isci/scil/scif_user_callback.h>
    
    #include <dev/isci/scil/scic_io_request.h>
    #include <dev/isci/scil/scic_user_callback.h>
    
    /**
     * @brief This user callback will inform the user that an IO request has
     *        completed.
     *
     * @param[in]  controller This parameter specifies the controller on
     *             which the IO request is completing.
     * @param[in]  remote_device This parameter specifies the remote device on
     *             which this request is completing.
     * @param[in]  io_request This parameter specifies the IO request that has
     *             completed.
     * @param[in]  completion_status This parameter specifies the results of
     *             the IO request operation.  SCI_IO_SUCCESS indicates
     *             successful completion.
     *
     * @return none
     */
    void
    scif_cb_io_request_complete(SCI_CONTROLLER_HANDLE_T scif_controller,
        SCI_REMOTE_DEVICE_HANDLE_T remote_device,
        SCI_IO_REQUEST_HANDLE_T io_request, SCI_IO_STATUS completion_status)
    {
            struct ISCI_IO_REQUEST *isci_request =
                (struct ISCI_IO_REQUEST *)sci_object_get_association(io_request);
    
            scif_controller_complete_io(scif_controller, remote_device, io_request);
            isci_io_request_complete(scif_controller, remote_device, isci_request,
                completion_status);
    }
    
    void
    isci_io_request_complete(SCI_CONTROLLER_HANDLE_T scif_controller,
        SCI_REMOTE_DEVICE_HANDLE_T remote_device,
        struct ISCI_IO_REQUEST *isci_request, SCI_IO_STATUS completion_status)
    {
            struct ISCI_CONTROLLER *isci_controller;
            struct ISCI_REMOTE_DEVICE *isci_remote_device;
            union ccb *ccb;
            BOOL complete_ccb;
    
            complete_ccb = TRUE;
            isci_controller = (struct ISCI_CONTROLLER *) sci_object_get_association(scif_controller);
            isci_remote_device =
                    (struct ISCI_REMOTE_DEVICE *) sci_object_get_association(remote_device);
    
            ccb = isci_request->ccb;
    
            ccb->ccb_h.status &= ~CAM_STATUS_MASK;
    
            switch (completion_status) {
           case SCI_IO_SUCCESS:
           case SCI_IO_SUCCESS_COMPLETE_BEFORE_START:
   #if __FreeBSD_version >= 900026
                   if (ccb->ccb_h.func_code == XPT_SMP_IO) {
                           void *smp_response =
                               scif_io_request_get_response_iu_address(
                                   isci_request->sci_object);
   
                           memcpy(ccb->smpio.smp_response, smp_response,
                               ccb->smpio.smp_response_len);
                   }
   #endif
                   ccb->ccb_h.status |= CAM_REQ_CMP;
                   break;
   
           case SCI_IO_SUCCESS_IO_DONE_EARLY:
                   ccb->ccb_h.status |= CAM_REQ_CMP;
                   ccb->csio.resid = ccb->csio.dxfer_len -
                       scif_io_request_get_number_of_bytes_transferred(
                           isci_request->sci_object);
                   break;
   
           case SCI_IO_FAILURE_RESPONSE_VALID:
           {
                   SCI_SSP_RESPONSE_IU_T * response_buffer;
                   uint32_t sense_length;
                   int error_code, sense_key, asc, ascq;
                   struct ccb_scsiio *csio = &ccb->csio;
   
                   response_buffer = (SCI_SSP_RESPONSE_IU_T *)
                       scif_io_request_get_response_iu_address(
                           isci_request->sci_object);
   
                   sense_length = sci_ssp_get_sense_data_length(
                       response_buffer->sense_data_length);
   
                   sense_length = MIN(csio->sense_len, sense_length);
   
                   memcpy(&csio->sense_data, response_buffer->data, sense_length);
   
                   csio->sense_resid = csio->sense_len - sense_length;
                   csio->scsi_status = response_buffer->status;
                   ccb->ccb_h.status |= CAM_SCSI_STATUS_ERROR;
                   ccb->ccb_h.status |= CAM_AUTOSNS_VALID;
                   scsi_extract_sense( &csio->sense_data, &error_code, &sense_key,
                       &asc, &ascq );
                   isci_log_message(1, "ISCI",
                       "isci: bus=%x target=%x lun=%x cdb[0]=%x status=%x key=%x asc=%x ascq=%x\n",
                       ccb->ccb_h.path_id, ccb->ccb_h.target_id,
                       ccb->ccb_h.target_lun, csio->cdb_io.cdb_bytes[0],
                       csio->scsi_status, sense_key, asc, ascq);
                   break;
           }
   
           case SCI_IO_FAILURE_REMOTE_DEVICE_RESET_REQUIRED:
                   isci_remote_device_reset(isci_remote_device, NULL);
   
                   /* drop through */
           case SCI_IO_FAILURE_TERMINATED:
                   ccb->ccb_h.status |= CAM_REQ_TERMIO;
                   isci_log_message(1, "ISCI",
                       "isci: bus=%x target=%x lun=%x cdb[0]=%x terminated\n",
                       ccb->ccb_h.path_id, ccb->ccb_h.target_id,
                       ccb->ccb_h.target_lun, ccb->csio.cdb_io.cdb_bytes[0]);
                   break;
   
           case SCI_IO_FAILURE_INVALID_STATE:
           case SCI_IO_FAILURE_INSUFFICIENT_RESOURCES:
                   complete_ccb = FALSE;
                   break;
   
           case SCI_IO_FAILURE_INVALID_REMOTE_DEVICE:
                   ccb->ccb_h.status |= CAM_DEV_NOT_THERE;
                   break;
   
           case SCI_IO_FAILURE_NO_NCQ_TAG_AVAILABLE:
                   {
                           struct ccb_relsim ccb_relsim;
                           struct cam_path *path;
   
                           xpt_create_path(&path, NULL,
                               cam_sim_path(isci_controller->sim),
                               isci_remote_device->index, 0);
   
                           xpt_setup_ccb(&ccb_relsim.ccb_h, path, 5);
                           ccb_relsim.ccb_h.func_code = XPT_REL_SIMQ;
                           ccb_relsim.ccb_h.flags = CAM_DEV_QFREEZE;
                           ccb_relsim.release_flags = RELSIM_ADJUST_OPENINGS;
                           ccb_relsim.openings =
                               scif_remote_device_get_max_queue_depth(remote_device);
                           xpt_action((union ccb *)&ccb_relsim);
                           xpt_free_path(path);
                           complete_ccb = FALSE;
                   }
                   break;
   
           case SCI_IO_FAILURE:
           case SCI_IO_FAILURE_REQUIRES_SCSI_ABORT:
           case SCI_IO_FAILURE_UNSUPPORTED_PROTOCOL:
           case SCI_IO_FAILURE_PROTOCOL_VIOLATION:
           case SCI_IO_FAILURE_INVALID_PARAMETER_VALUE:
           case SCI_IO_FAILURE_CONTROLLER_SPECIFIC_ERR:
           default:
                   isci_log_message(1, "ISCI",
                       "isci: bus=%x target=%x lun=%x cdb[0]=%x completion status=%x\n",
                       ccb->ccb_h.path_id, ccb->ccb_h.target_id,
                       ccb->ccb_h.target_lun, ccb->csio.cdb_io.cdb_bytes[0],
                       completion_status);
                   ccb->ccb_h.status |= CAM_REQ_CMP_ERR;
                   break;
           }
   
           callout_stop(&isci_request->parent.timer);
           bus_dmamap_sync(isci_request->parent.dma_tag,
               isci_request->parent.dma_map,
               BUS_DMASYNC_POSTREAD | BUS_DMASYNC_POSTWRITE);
   
           bus_dmamap_unload(isci_request->parent.dma_tag,
               isci_request->parent.dma_map);
   
           isci_request->ccb = NULL;
   
           sci_pool_put(isci_controller->request_pool,
               (struct ISCI_REQUEST *)isci_request);
   
           if (complete_ccb) {
                   if ((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
                           /* ccb will be completed with some type of non-success
                            *  status.  So temporarily freeze the queue until the
                            *  upper layers can act on the status.  The
                            *  CAM_DEV_QFRZN flag will then release the queue
                            *  after the status is acted upon.
                            */
                           ccb->ccb_h.status |= CAM_DEV_QFRZN;
                           xpt_freeze_devq(ccb->ccb_h.path, 1);
                   }
   
                   if (ccb->ccb_h.status & CAM_SIM_QUEUED) {
   
                           KASSERT(ccb == isci_remote_device->queued_ccb_in_progress,
                               ("multiple internally queued ccbs in flight"));
   
                           TAILQ_REMOVE(&isci_remote_device->queued_ccbs,
                               &ccb->ccb_h, sim_links.tqe);
                           ccb->ccb_h.status &= ~CAM_SIM_QUEUED;
   
                           /*
                            * This CCB that was in the queue was completed, so
                            *  set the in_progress pointer to NULL denoting that
                            *  we can retry another CCB from the queue.  We only
                            *  allow one CCB at a time from the queue to be
                            *  in progress so that we can effectively maintain
                            *  ordering.
                            */
                           isci_remote_device->queued_ccb_in_progress = NULL;
                   }
   
                   if (isci_remote_device->frozen_lun_mask != 0) {
                           isci_remote_device_release_device_queue(isci_remote_device);
                   }
   
                   xpt_done(ccb);
   
                   if (isci_controller->is_frozen == TRUE) {
                           isci_controller->is_frozen = FALSE;
                           xpt_release_simq(isci_controller->sim, TRUE);
                   }
           } else {
                   isci_remote_device_freeze_lun_queue(isci_remote_device,
                       ccb->ccb_h.target_lun);
   
                   if (ccb->ccb_h.status & CAM_SIM_QUEUED) {
   
                           KASSERT(ccb == isci_remote_device->queued_ccb_in_progress,
                               ("multiple internally queued ccbs in flight"));
   
                           /*
                            *  Do nothing, CCB is already on the device's queue.
                            *   We leave it on the queue, to be retried again
                            *   next time a CCB on this device completes, or we
                            *   get a ready notification for this device.
                            */
                           isci_log_message(1, "ISCI", "already queued %p %x\n",
                               ccb, ccb->csio.cdb_io.cdb_bytes[0]);
   
                           isci_remote_device->queued_ccb_in_progress = NULL;
   
                   } else {
                           isci_log_message(1, "ISCI", "queue %p %x\n", ccb,
                               ccb->csio.cdb_io.cdb_bytes[0]);
                           ccb->ccb_h.status |= CAM_SIM_QUEUED;
   
                           TAILQ_INSERT_TAIL(&isci_remote_device->queued_ccbs,
                               &ccb->ccb_h, sim_links.tqe);
                   }
           }
   }
   
   /**
    * @brief This callback method asks the user to provide the physical
    *        address for the supplied virtual address when building an
    *        io request object.
    *
    * @param[in] controller This parameter is the core controller object
    *            handle.
    * @param[in] io_request This parameter is the io request object handle
    *            for which the physical address is being requested.
    * @param[in] virtual_address This paramter is the virtual address which
    *            is to be returned as a physical address.
    * @param[out] physical_address The physical address for the supplied virtual
    *             address.
    *
    * @return None.
    */
   void
   scic_cb_io_request_get_physical_address(SCI_CONTROLLER_HANDLE_T controller,
       SCI_IO_REQUEST_HANDLE_T io_request, void *virtual_address,
       SCI_PHYSICAL_ADDRESS *physical_address)
   {
           SCI_IO_REQUEST_HANDLE_T scif_request =
               sci_object_get_association(io_request);
           struct ISCI_REQUEST *isci_request =
               sci_object_get_association(scif_request);
   
           if(isci_request != NULL) {
                   /* isci_request is not NULL, meaning this is a request initiated
                    *  by CAM or the isci layer (i.e. device reset for I/O
                    *  timeout).  Therefore we can calculate the physical address
                    *  based on the address we stored in the struct ISCI_REQUEST
                    *  object.
                    */
                   *physical_address = isci_request->physical_address +
                       (uintptr_t)virtual_address -
                       (uintptr_t)isci_request;
           } else {
                   /* isci_request is NULL, meaning this is a request generated
                    *  internally by SCIL (i.e. for SMP requests or NCQ error
                    *  recovery).  Therefore we calculate the physical address
                    *  based on the controller's uncached controller memory buffer,
                    *  since we know that this is what SCIL uses for internal
                    *  framework requests.
                    */
                   SCI_CONTROLLER_HANDLE_T scif_controller =
                       (SCI_CONTROLLER_HANDLE_T) sci_object_get_association(controller);
                   struct ISCI_CONTROLLER *isci_controller =
                       (struct ISCI_CONTROLLER *)sci_object_get_association(scif_controller);
                   U64 virt_addr_offset = (uintptr_t)virtual_address -
                       (U64)isci_controller->uncached_controller_memory.virtual_address;
   
                   *physical_address =
                       isci_controller->uncached_controller_memory.physical_address
                       + virt_addr_offset;
           }
   }
   
   /**
    * @brief This callback method asks the user to provide the address for
    *        the command descriptor block (CDB) associated with this IO request.
    *
    * @param[in] scif_user_io_request This parameter points to the user's
    *            IO 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 of the CDB.
    */
   void *
   scif_cb_io_request_get_cdb_address(void * scif_user_io_request)
   {
           struct ISCI_IO_REQUEST *isci_request =
               (struct ISCI_IO_REQUEST *)scif_user_io_request;
   
           return (isci_request->ccb->csio.cdb_io.cdb_bytes);
   }
   
   /**
    * @brief This callback method asks the user to provide the length of
    *        the command descriptor block (CDB) associated with this IO request.
    *
    * @param[in] scif_user_io_request This parameter points to the user's
    *            IO 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 CDB.
    */
   uint32_t
   scif_cb_io_request_get_cdb_length(void * scif_user_io_request)
   {
           struct ISCI_IO_REQUEST *isci_request =
               (struct ISCI_IO_REQUEST *)scif_user_io_request;
   
           return (isci_request->ccb->csio.cdb_len);
   }
   
   /**
    * @brief This callback method asks the user to provide the Logical Unit (LUN)
    *        associated with this IO 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 command information unit description
    *       in the associated standard.
    *
    * @param[in] scif_user_io_request This parameter points to the user's
    *            IO 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.
    */
   uint32_t
   scif_cb_io_request_get_lun(void * scif_user_io_request)
   {
           struct ISCI_IO_REQUEST *isci_request =
               (struct ISCI_IO_REQUEST *)scif_user_io_request;
   
           return (isci_request->ccb->ccb_h.target_lun);
   }
   
   /**
    * @brief This callback method asks the user to provide the task attribute
    *        associated with this IO 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 command information unit description
    *       in the associated standard.
    *
    * @param[in] scif_user_io_request This parameter points to the user's
    *            IO request object.  It is a cookie that allows the user to
    *            provide the necessary information for this callback.
    *
    * @return This method returns the task attribute associated with this
    *         IO request.
    */
   uint32_t
   scif_cb_io_request_get_task_attribute(void * scif_user_io_request)
   {
           struct ISCI_IO_REQUEST *isci_request =
               (struct ISCI_IO_REQUEST *)scif_user_io_request;
           uint32_t task_attribute;
   
           if((isci_request->ccb->ccb_h.flags & CAM_TAG_ACTION_VALID) != 0)
                   switch(isci_request->ccb->csio.tag_action) {
                   case MSG_HEAD_OF_Q_TAG:
                           task_attribute = SCI_SAS_HEAD_OF_QUEUE_ATTRIBUTE;
                           break;
   
                   case MSG_ORDERED_Q_TAG:
                           task_attribute = SCI_SAS_ORDERED_ATTRIBUTE;
                           break;
   
                   case MSG_ACA_TASK:
                           task_attribute = SCI_SAS_ACA_ATTRIBUTE;
                           break;
   
                   default:
                           task_attribute = SCI_SAS_SIMPLE_ATTRIBUTE;
                           break;
                   }
           else
                   task_attribute = SCI_SAS_SIMPLE_ATTRIBUTE;
   
           return (task_attribute);
   }
   
   /**
    * @brief This callback method asks the user to provide the command priority
    *        associated with this IO 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 command information unit description
    *       in the associated standard.
    *
    * @param[in] scif_user_io_request This parameter points to the user's
    *            IO request object.  It is a cookie that allows the user to
    *            provide the necessary information for this callback.
    *
    * @return This method returns the command priority associated with this
    *         IO request.
    */
   uint32_t
   scif_cb_io_request_get_command_priority(void * scif_user_io_request)
   {
           return (0);
   }
   
   /**
    * @brief This method simply returns the virtual address associated
    *        with the scsi_io and byte_offset supplied parameters.
    *
    * @note This callback is not utilized in the fast path.  The expectation
    *       is that this method is utilized for items such as SCSI to ATA
    *       translation for commands like INQUIRY, READ CAPACITY, etc.
    *
    * @param[in] scif_user_io_request This parameter points to the user's
    *            IO request object.  It is a cookie that allows the user to
    *            provide the necessary information for this callback.
    * @param[in] byte_offset This parameter specifies the offset into the data
    *            buffers pointed to by the SGL.  The byte offset starts at 0
    *            and continues until the last byte pointed to be the last SGL
    *            element.
    *
    * @return A virtual address pointer to the location specified by the
    *         parameters.
    */
   uint8_t *
   scif_cb_io_request_get_virtual_address_from_sgl(void * scif_user_io_request,
       uint32_t byte_offset)
   {
           struct ISCI_IO_REQUEST *isci_request =
               (struct ISCI_IO_REQUEST *)scif_user_io_request;
   
           return (isci_request->ccb->csio.data_ptr + byte_offset);
   }
   
   /**
    * @brief This callback method asks the user to provide the number of
    *        bytes to be transfered as part of this request.
    *
    * @param[in] scif_user_io_request This parameter points to the user's
    *            IO request object.  It is a cookie that allows the user to
    *            provide the necessary information for this callback.
    *
    * @return This method returns the number of payload data bytes to be
    *         transfered for this IO request.
    */
   uint32_t
   scif_cb_io_request_get_transfer_length(void * scif_user_io_request)
   {
           struct ISCI_IO_REQUEST *isci_request =
               (struct ISCI_IO_REQUEST *)scif_user_io_request;
   
           return (isci_request->ccb->csio.dxfer_len);
   
   }
   
   /**
    * @brief This callback method asks the user to provide the data direction
    *        for this request.
    *
    * @param[in] scif_user_io_request This parameter points to the user's
    *            IO request object.  It is a cookie that allows the user to
    *            provide the necessary information for this callback.
    *
    * @return This method returns the value of SCI_IO_REQUEST_DATA_OUT,
    *         SCI_IO_REQUEST_DATA_IN, or SCI_IO_REQUEST_NO_DATA.
    */
   SCI_IO_REQUEST_DATA_DIRECTION
   scif_cb_io_request_get_data_direction(void * scif_user_io_request)
   {
           struct ISCI_IO_REQUEST *isci_request =
               (struct ISCI_IO_REQUEST *)scif_user_io_request;
   
           switch (isci_request->ccb->ccb_h.flags & CAM_DIR_MASK) {
           case CAM_DIR_IN:
                   return (SCI_IO_REQUEST_DATA_IN);
           case CAM_DIR_OUT:
                   return (SCI_IO_REQUEST_DATA_OUT);
           default:
                   return (SCI_IO_REQUEST_NO_DATA);
           }
   }
   
   /**
    * @brief This callback method asks the user to provide the address
    *        to where the next Scatter-Gather Element is located.
    *
    * Details regarding usage:
    *   - Regarding the first SGE: the user should initialize an index,
    *     or a pointer, prior to construction of the request that will
    *     reference the very first scatter-gather element.  This is
    *     important since this method is called for every scatter-gather
    *     element, including the first element.
    *   - Regarding the last SGE: the user should return NULL from this
    *     method when this method is called and the SGL has exhausted
    *     all elements.
    *
    * @param[in] scif_user_io_request This parameter points to the user's
    *            IO request object.  It is a cookie that allows the user to
    *            provide the necessary information for this callback.
    * @param[in] current_sge_address This parameter specifies the address for
    *            the current SGE (i.e. the one that has just processed).
    * @param[out] next_sge An address specifying the location for the next scatter
    *             gather element to be processed.
    *
    * @return None.
    */
   void
   scif_cb_io_request_get_next_sge(void * scif_user_io_request,
       void * current_sge_address, void ** next_sge)
   {
           struct ISCI_IO_REQUEST *isci_request =
               (struct ISCI_IO_REQUEST *)scif_user_io_request;
   
           if (isci_request->current_sge_index == isci_request->num_segments)
                   *next_sge = NULL;
           else {
                   bus_dma_segment_t *sge =
                       &isci_request->sge[isci_request->current_sge_index];
   
                   isci_request->current_sge_index++;
                   *next_sge = sge;
           }
   }
   
   /**
    * @brief This callback method asks the user to provide the contents of the
    *        "address" field in the Scatter-Gather Element.
    *
    * @param[in] scif_user_io_request This parameter points to the user's
    *            IO request object.  It is a cookie that allows the user to
    *            provide the necessary information for this callback.
    * @param[in] sge_address This parameter specifies the address for the
    *            SGE from which to retrieve the address field.
    *
    * @return A physical address specifying the contents of the SGE's address
    *         field.
    */
   SCI_PHYSICAL_ADDRESS
   scif_cb_sge_get_address_field(void *scif_user_io_request, void *sge_address)
   {
           bus_dma_segment_t *sge = (bus_dma_segment_t *)sge_address;
   
           return ((SCI_PHYSICAL_ADDRESS)sge->ds_addr);
   }
   
   /**
    * @brief This callback method asks the user to provide the contents of the
    *        "length" field in the Scatter-Gather Element.
    *
    * @param[in] scif_user_io_request This parameter points to the user's
    *            IO request object.  It is a cookie that allows the user to
    *            provide the necessary information for this callback.
    * @param[in] sge_address This parameter specifies the address for the
    *            SGE from which to retrieve the address field.
    *
    * @return This method returns the length field specified inside the SGE
    *         referenced by the sge_address parameter.
    */
   uint32_t
   scif_cb_sge_get_length_field(void *scif_user_io_request, void *sge_address)
   {
           bus_dma_segment_t *sge = (bus_dma_segment_t *)sge_address;
   
           return ((uint32_t)sge->ds_len);
   }
   
   void
   isci_request_construct(struct ISCI_REQUEST *request,
       SCI_CONTROLLER_HANDLE_T scif_controller_handle,
       bus_dma_tag_t io_buffer_dma_tag, bus_addr_t physical_address)
   {
   
           request->controller_handle = scif_controller_handle;
           request->dma_tag = io_buffer_dma_tag;
           request->physical_address = physical_address;
           bus_dmamap_create(request->dma_tag, 0, &request->dma_map);
           callout_init(&request->timer, CALLOUT_MPSAFE);
   }
   
   static void
   isci_io_request_construct(void *arg, bus_dma_segment_t *seg, int nseg,
       int error)
   {
           union ccb *ccb;
           struct ISCI_IO_REQUEST *io_request = (struct ISCI_IO_REQUEST *)arg;
           SCI_REMOTE_DEVICE_HANDLE_T *device = io_request->parent.remote_device_handle;
           SCI_STATUS status;
   
           io_request->num_segments = nseg;
           io_request->sge = seg;
           ccb = io_request->ccb;
   
           if (error != 0) {
                   ccb->ccb_h.status = CAM_REQ_INVALID;
                   xpt_done(ccb);
                   return;
           }
   
           status = scif_io_request_construct(
               io_request->parent.controller_handle,
               io_request->parent.remote_device_handle,
               SCI_CONTROLLER_INVALID_IO_TAG, (void *)io_request,
               (void *)((char*)io_request + sizeof(struct ISCI_IO_REQUEST)),
               &io_request->sci_object);
   
           if (status != SCI_SUCCESS) {
                   isci_io_request_complete(io_request->parent.controller_handle,
                       device, io_request, (SCI_IO_STATUS)status);
                   return;
           }
   
           sci_object_set_association(io_request->sci_object, io_request);
   
           bus_dmamap_sync(io_request->parent.dma_tag, io_request->parent.dma_map,
               BUS_DMASYNC_PREREAD | BUS_DMASYNC_PREWRITE);
   
           status = (SCI_STATUS)scif_controller_start_io(
               io_request->parent.controller_handle, device,
               io_request->sci_object, SCI_CONTROLLER_INVALID_IO_TAG);
   
           if (status != SCI_SUCCESS) {
                   isci_io_request_complete(io_request->parent.controller_handle,
                       device, io_request, (SCI_IO_STATUS)status);
                   return;
           }
   
           if (ccb->ccb_h.timeout != CAM_TIME_INFINITY)
                   callout_reset(&io_request->parent.timer, ccb->ccb_h.timeout,
                       isci_io_request_timeout, io_request);
   }
   
   void
   isci_io_request_execute_scsi_io(union ccb *ccb,
       struct ISCI_CONTROLLER *controller)
   {
           struct ccb_scsiio *csio = &ccb->csio;
           target_id_t target_id = ccb->ccb_h.target_id;
           struct ISCI_REQUEST *request;
           struct ISCI_IO_REQUEST *io_request;
           struct ISCI_REMOTE_DEVICE *device =
               controller->remote_device[target_id];
           int error;
   
           if (device == NULL) {
                   ccb->ccb_h.status &= ~CAM_SIM_QUEUED;
                   ccb->ccb_h.status &= ~CAM_STATUS_MASK;
                   ccb->ccb_h.status |= CAM_DEV_NOT_THERE;
                   xpt_done(ccb);
                   return;
           }
   
           if (sci_pool_empty(controller->request_pool)) {
                   ccb->ccb_h.status &= ~CAM_SIM_QUEUED;
                   ccb->ccb_h.status &= ~CAM_STATUS_MASK;
                   ccb->ccb_h.status |= CAM_REQUEUE_REQ;
                   xpt_freeze_simq(controller->sim, 1);
                   controller->is_frozen = TRUE;
                   xpt_done(ccb);
                   return;
           }
   
           ASSERT(device->is_resetting == FALSE);
   
           sci_pool_get(controller->request_pool, request);
           io_request = (struct ISCI_IO_REQUEST *)request;
   
           io_request->ccb = ccb;
           io_request->current_sge_index = 0;
           io_request->parent.remote_device_handle = device->sci_object;
   
           if ((ccb->ccb_h.flags & CAM_SCATTER_VALID) != 0)
                   panic("Unexpected CAM_SCATTER_VALID flag!  flags = 0x%x\n",
                       ccb->ccb_h.flags);
   
           if ((ccb->ccb_h.flags & CAM_DATA_PHYS) != 0)
                   panic("Unexpected CAM_DATA_PHYS flag!  flags = 0x%x\n",
                       ccb->ccb_h.flags);
   
           if ((ccb->ccb_h.flags & CAM_DIR_MASK) != CAM_DIR_NONE) {
                   error = bus_dmamap_load(io_request->parent.dma_tag,
                       io_request->parent.dma_map, csio->data_ptr, csio->dxfer_len,
                       isci_io_request_construct, io_request, 0x0);
   
                   /* A resource shortage from BUSDMA will be automatically
                    * continued at a later point, pushing the CCB processing
                    * forward, which will in turn unfreeze the simq.
                    */
                   if (error == EINPROGRESS) {
                           xpt_freeze_simq(controller->sim, 1);
                           ccb->ccb_h.flags |= CAM_RELEASE_SIMQ;
                   }
           } else
                   isci_io_request_construct(io_request, NULL, 0, 0);
   }
   
   void
   isci_io_request_timeout(void *arg)
   {
           struct ISCI_IO_REQUEST *request = (struct ISCI_IO_REQUEST *)arg;
           struct ISCI_REMOTE_DEVICE *remote_device = (struct ISCI_REMOTE_DEVICE *)
                   sci_object_get_association(request->parent.remote_device_handle);
           struct ISCI_CONTROLLER *controller = remote_device->domain->controller;
   
           mtx_lock(&controller->lock);
           isci_remote_device_reset(remote_device, NULL);
           mtx_unlock(&controller->lock);
   }
   
   #if __FreeBSD_version >= 900026
   /**
    * @brief This callback method gets the size of and pointer to the buffer
    *         (if any) containing the request buffer for an SMP request.
    *
    * @param[in]  core_request This parameter specifies the SCI core's request
    *             object associated with the SMP request.
    * @param[out] smp_request_buffer This parameter returns a pointer to the
    *             payload portion of the SMP request - i.e. everything after
    *             the SMP request header.
    *
    * @return Size of the request buffer in bytes.  This does *not* include
    *          the size of the SMP request header.
    */
   static uint32_t
   smp_io_request_cb_get_request_buffer(SCI_IO_REQUEST_HANDLE_T core_request,
       uint8_t ** smp_request_buffer)
   {
           struct ISCI_IO_REQUEST *isci_request = (struct ISCI_IO_REQUEST *)
               sci_object_get_association(sci_object_get_association(core_request));
   
           *smp_request_buffer = isci_request->ccb->smpio.smp_request +
               sizeof(SMP_REQUEST_HEADER_T);
   
           return (isci_request->ccb->smpio.smp_request_len -
               sizeof(SMP_REQUEST_HEADER_T));
   }
   
   /**
    * @brief This callback method gets the SMP function for an SMP request.
    *
    * @param[in]  core_request This parameter specifies the SCI core's request
    *             object associated with the SMP request.
    *
    * @return SMP function for the SMP request.
    */
   static uint8_t
   smp_io_request_cb_get_function(SCI_IO_REQUEST_HANDLE_T core_request)
   {
           struct ISCI_IO_REQUEST *isci_request = (struct ISCI_IO_REQUEST *)
               sci_object_get_association(sci_object_get_association(core_request));
           SMP_REQUEST_HEADER_T *header =
               (SMP_REQUEST_HEADER_T *)isci_request->ccb->smpio.smp_request;
   
           return (header->function);
   }
   
   /**
    * @brief This callback method gets the SMP frame type for an SMP request.
    *
    * @param[in]  core_request This parameter specifies the SCI core's request
    *             object associated with the SMP request.
    *
    * @return SMP frame type for the SMP request.
    */
   static uint8_t
   smp_io_request_cb_get_frame_type(SCI_IO_REQUEST_HANDLE_T core_request)
   {
           struct ISCI_IO_REQUEST *isci_request = (struct ISCI_IO_REQUEST *)
               sci_object_get_association(sci_object_get_association(core_request));
           SMP_REQUEST_HEADER_T *header =
               (SMP_REQUEST_HEADER_T *)isci_request->ccb->smpio.smp_request;
   
           return (header->smp_frame_type);
   }
   
   /**
    * @brief This callback method gets the allocated response length for an SMP request.
    *
    * @param[in]  core_request This parameter specifies the SCI core's request
    *             object associated with the SMP request.
    *
    * @return Allocated response length for the SMP request.
    */
   static uint8_t
   smp_io_request_cb_get_allocated_response_length(
       SCI_IO_REQUEST_HANDLE_T core_request)
   {
           struct ISCI_IO_REQUEST *isci_request = (struct ISCI_IO_REQUEST *)
               sci_object_get_association(sci_object_get_association(core_request));
           SMP_REQUEST_HEADER_T *header =
               (SMP_REQUEST_HEADER_T *)isci_request->ccb->smpio.smp_request;
   
           return (header->allocated_response_length);
   }
   
   static SCI_STATUS
   isci_smp_request_construct(struct ISCI_IO_REQUEST *request)
   {
           SCI_STATUS status;
           SCIC_SMP_PASSTHRU_REQUEST_CALLBACKS_T callbacks;
   
           status = scif_request_construct(request->parent.controller_handle,
               request->parent.remote_device_handle, SCI_CONTROLLER_INVALID_IO_TAG,
               (void *)request,
               (void *)((char*)request + sizeof(struct ISCI_IO_REQUEST)),
               &request->sci_object);
   
           if (status == SCI_SUCCESS) {
                   callbacks.scic_cb_smp_passthru_get_request =
                       &smp_io_request_cb_get_request_buffer;
                   callbacks.scic_cb_smp_passthru_get_function =
                       &smp_io_request_cb_get_function;
                   callbacks.scic_cb_smp_passthru_get_frame_type =
                       &smp_io_request_cb_get_frame_type;
                   callbacks.scic_cb_smp_passthru_get_allocated_response_length =
                       &smp_io_request_cb_get_allocated_response_length;
   
                   /* create the smp passthrough part of the io request */
                   status = scic_io_request_construct_smp_pass_through(
                       scif_io_request_get_scic_handle(request->sci_object),
                       &callbacks);
           }
   
           return (status);
   }
   
   void
   isci_io_request_execute_smp_io(union ccb *ccb,
       struct ISCI_CONTROLLER *controller)
   {
           SCI_STATUS status;
           target_id_t target_id = ccb->ccb_h.target_id;
           struct ISCI_REQUEST *request;
           struct ISCI_IO_REQUEST *io_request;
           SCI_REMOTE_DEVICE_HANDLE_T smp_device_handle;
           struct ISCI_REMOTE_DEVICE *end_device = controller->remote_device[target_id];
   
           /* SMP commands are sent to an end device, because SMP devices are not
            *  exposed to the kernel.  It is our responsibility to use this method
            *  to get the SMP device that contains the specified end device.  If
            *  the device is direct-attached, the handle will come back NULL, and
            *  we'll just fail the SMP_IO with DEV_NOT_THERE.
            */
           scif_remote_device_get_containing_device(end_device->sci_object,
               &smp_device_handle);
   
           if (smp_device_handle == NULL) {
                   ccb->ccb_h.status &= ~CAM_SIM_QUEUED;
                   ccb->ccb_h.status &= ~CAM_STATUS_MASK;
                   ccb->ccb_h.status |= CAM_DEV_NOT_THERE;
                   xpt_done(ccb);
                   return;
           }
   
           if (sci_pool_empty(controller->request_pool)) {
                   ccb->ccb_h.status &= ~CAM_SIM_QUEUED;
                   ccb->ccb_h.status &= ~CAM_STATUS_MASK;
                   ccb->ccb_h.status |= CAM_REQUEUE_REQ;
                   xpt_freeze_simq(controller->sim, 1);
                   controller->is_frozen = TRUE;
                   xpt_done(ccb);
                   return;
           }
   
           ASSERT(device->is_resetting == FALSE);
   
           sci_pool_get(controller->request_pool, request);
           io_request = (struct ISCI_IO_REQUEST *)request;
   
           io_request->ccb = ccb;
           io_request->parent.remote_device_handle = smp_device_handle;
   
           status = isci_smp_request_construct(io_request);
   
           if (status != SCI_SUCCESS) {
                   isci_io_request_complete(controller->scif_controller_handle,
                       smp_device_handle, io_request, (SCI_IO_STATUS)status);
                   return;
           }
   
           sci_object_set_association(io_request->sci_object, io_request);
   
           status = (SCI_STATUS) scif_controller_start_io(
               controller->scif_controller_handle, smp_device_handle,
               io_request->sci_object, SCI_CONTROLLER_INVALID_IO_TAG);
   
           if (status != SCI_SUCCESS) {
                   isci_io_request_complete(controller->scif_controller_handle,
                       smp_device_handle, io_request, (SCI_IO_STATUS)status);
                   return;
           }
   
           if (ccb->ccb_h.timeout != CAM_TIME_INFINITY)
                   callout_reset(&io_request->parent.timer, ccb->ccb_h.timeout,
                       isci_io_request_timeout, request);
   }
   #endif

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