drivers/scsi/isci/core/scic_sds_ssp_request.c

   1 /*
   2  * This file is provided under a dual BSD/GPLv2 license.  When using or
   3  * redistributing this file, you may do so under either license.
   4  *
   5  * GPL LICENSE SUMMARY
   6  *
   7  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of version 2 of the GNU General Public License as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  21  * The full GNU General Public License is included in this distribution
  22  * in the file called LICENSE.GPL.
  23  *
  24  * BSD LICENSE
  25  *
  26  * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved.
  27  * All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  *
  33  *   * Redistributions of source code must retain the above copyright
  34  *     notice, this list of conditions and the following disclaimer.
  35  *   * Redistributions in binary form must reproduce the above copyright
  36  *     notice, this list of conditions and the following disclaimer in
  37  *     the documentation and/or other materials provided with the
  38  *     distribution.
  39  *   * Neither the name of Intel Corporation nor the names of its
  40  *     contributors may be used to endorse or promote products derived
  41  *     from this software without specific prior written permission.
  42  *
  43  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  44  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  45  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  46  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  47  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  48  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  49  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  50  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  51  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  52  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  53  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  54  */
  55
  56 #include "intel_sas.h"
  57 #include "sci_base_state_machine.h"
  58 #include "scic_controller.h"
  59 #include "scic_sds_controller.h"
  60 #include "scic_sds_request.h"
  61 #include "sci_environment.h"
  62 #include "scu_completion_codes.h"
  63 #include "scu_task_context.h"
  64
  65 /**
  66  * This method processes the completions transport layer (TL) status to
  67  *    determine if the RAW task management frame was sent successfully. If the
  68  *    raw frame was sent successfully, then the state for the task request
  69  *    transitions to waiting for a response frame.
  70  * @sci_req: This parameter specifies the request for which the TC
  71  *    completion was received.
  72  * @completion_code: This parameter indicates the completion status information
  73  *    for the TC.
  74  *
  75  * Indicate if the tc completion handler was successful. SCI_SUCCESS currently
  76  * this method always returns success.
  77  */
  78 static enum sci_status scic_sds_ssp_task_request_await_tc_completion_tc_completion_handler(
  79         struct scic_sds_request *sci_req,
  80         u32 completion_code)
  81 {
  82         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
  83         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
  84                 scic_sds_request_set_status(
  85                         sci_req, SCU_TASK_DONE_GOOD, SCI_SUCCESS
  86                         );
  87
  88                 sci_base_state_machine_change_state(
  89                         &sci_req->started_substate_machine,
  90                         SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_RESPONSE
  91                         );
  92                 break;
  93
  94         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_ACK_NAK_TO):
  95                 /*
  96                  * Currently, the decision is to simply allow the task request to
  97                  * timeout if the task IU wasn't received successfully.
  98                  * There is a potential for receiving multiple task responses if we
  99                  * decide to send the task IU again. */
 100                 dev_warn(scic_to_dev(sci_req->owning_controller),
 101                          "%s: TaskRequest:0x%p CompletionCode:%x - "
 102                          "ACK/NAK timeout\n",
 103                          __func__,
 104                          sci_req,
 105                          completion_code);
 106
 107                 sci_base_state_machine_change_state(
 108                         &sci_req->started_substate_machine,
 109                         SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_RESPONSE
 110                         );
 111                 break;
 112
 113         default:
 114                 /*
 115                  * All other completion status cause the IO to be complete.  If a NAK
 116                  * was received, then it is up to the user to retry the request. */
 117                 scic_sds_request_set_status(
 118                         sci_req,
 119                         SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
 120                         SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR
 121                         );
 122
 123                 sci_base_state_machine_change_state(&sci_req->state_machine,
 124                         SCI_BASE_REQUEST_STATE_COMPLETED);
 125                 break;
 126         }
 127
 128         return SCI_SUCCESS;
 129 }
 130
 131 /**
 132  * This method is responsible for processing a terminate/abort request for this
 133  *    TC while the request is waiting for the task management response
 134  *    unsolicited frame.
 135  * @sci_req: This parameter specifies the request for which the
 136  *    termination was requested.
 137  *
 138  * This method returns an indication as to whether the abort request was
 139  * successfully handled. need to update to ensure the received UF doesn't cause
 140  * damage to subsequent requests (i.e. put the extended tag in a holding
 141  * pattern for this particular device).
 142  */
 143 static enum sci_status scic_sds_ssp_task_request_await_tc_response_abort_handler(
 144         struct scic_sds_request *request)
 145 {
 146         sci_base_state_machine_change_state(&request->state_machine,
 147                         SCI_BASE_REQUEST_STATE_ABORTING);
 148         sci_base_state_machine_change_state(&request->state_machine,
 149                         SCI_BASE_REQUEST_STATE_COMPLETED);
 150         return SCI_SUCCESS;
 151 }
 152
 153 /**
 154  * This method processes an unsolicited frame while the task mgmt request is
 155  *    waiting for a response frame.  It will copy the response data, release
 156  *    the unsolicited frame, and transition the request to the
 157  *    SCI_BASE_REQUEST_STATE_COMPLETED state.
 158  * @sci_req: This parameter specifies the request for which the
 159  *    unsolicited frame was received.
 160  * @frame_index: This parameter indicates the unsolicited frame index that
 161  *    should contain the response.
 162  *
 163  * This method returns an indication of whether the TC response frame was
 164  * handled successfully or not. SCI_SUCCESS Currently this value is always
 165  * returned and indicates successful processing of the TC response. Should
 166  * probably update to check frame type and make sure it is a response frame.
 167  */
 168 static enum sci_status scic_sds_ssp_task_request_await_tc_response_frame_handler(
 169         struct scic_sds_request *request,
 170         u32 frame_index)
 171 {
 172         scic_sds_io_request_copy_response(request);
 173
 174         sci_base_state_machine_change_state(&request->state_machine,
 175                 SCI_BASE_REQUEST_STATE_COMPLETED);
 176         scic_sds_controller_release_frame(request->owning_controller,
 177                         frame_index);
 178         return SCI_SUCCESS;
 179 }
 180
 181 static const struct scic_sds_io_request_state_handler scic_sds_ssp_task_request_started_substate_handler_table[] = {
 182         [SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_COMPLETION] = {
 183                 .abort_handler          = scic_sds_request_started_state_abort_handler,
 184                 .tc_completion_handler  = scic_sds_ssp_task_request_await_tc_completion_tc_completion_handler,
 185         },
 186         [SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_RESPONSE] = {
 187                 .abort_handler          = scic_sds_ssp_task_request_await_tc_response_abort_handler,
 188                 .frame_handler          = scic_sds_ssp_task_request_await_tc_response_frame_handler,
 189         }
 190 };
 191
 192 /**
 193  * This method performs the actions required when entering the
 194  *    SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_COMPLETION
 195  *    sub-state.  This includes setting the IO request state handlers for this
 196  *    sub-state.
 197  * @object: This parameter specifies the request object for which the sub-state
 198  *    change is occuring.
 199  *
 200  * none.
 201  */
 202 static void scic_sds_io_request_started_task_mgmt_await_tc_completion_substate_enter(
 203         struct sci_base_object *object)
 204 {
 205         struct scic_sds_request *sci_req = (struct scic_sds_request *)object;
 206
 207         SET_STATE_HANDLER(
 208                 sci_req,
 209                 scic_sds_ssp_task_request_started_substate_handler_table,
 210                 SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_COMPLETION
 211                 );
 212 }
 213
 214 /**
 215  * This method performs the actions required when entering the
 216  *    SCIC_SDS_IO_REQUEST_STARTED_SUBSTATE_AWAIT_TC_RESPONSE sub-state. This
 217  *    includes setting the IO request state handlers for this sub-state.
 218  * @object: This parameter specifies the request object for which the sub-state
 219  *    change is occuring.
 220  *
 221  * none.
 222  */
 223 static void scic_sds_io_request_started_task_mgmt_await_task_response_substate_enter(
 224         struct sci_base_object *object)
 225 {
 226         struct scic_sds_request *sci_req = (struct scic_sds_request *)object;
 227
 228         SET_STATE_HANDLER(
 229                 sci_req,
 230                 scic_sds_ssp_task_request_started_substate_handler_table,
 231                 SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_RESPONSE
 232                 );
 233 }
 234
 235 const struct sci_base_state scic_sds_io_request_started_task_mgmt_substate_table[] = {
 236         [SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_COMPLETION] = {
 237                 .enter_state = scic_sds_io_request_started_task_mgmt_await_tc_completion_substate_enter,
 238         },
 239         [SCIC_SDS_IO_REQUEST_STARTED_TASK_MGMT_SUBSTATE_AWAIT_TC_RESPONSE] = {
 240                 .enter_state = scic_sds_io_request_started_task_mgmt_await_task_response_substate_enter,
 241         },
 242 };
 243