drivers/scsi/isci/core/scic_sds_smp_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 "remote_device.h"
  61 #include "scic_sds_request.h"
  62 #include "scic_sds_smp_request.h"
  63 #include "sci_environment.h"
  64 #include "sci_util.h"
  65 #include "scu_completion_codes.h"
  66 #include "scu_task_context.h"
  67
  68 static void scu_smp_request_construct_task_context(
  69         struct scic_sds_request *sci_req,
  70         struct smp_request *smp_request);
  71
  72 /**
  73  *
  74  *
  75  * This method return the memory space required for STP PIO requests. u32
  76  */
  77 u32 scic_sds_smp_request_get_object_size(void)
  78 {
  79         return sizeof(struct scic_sds_request)
  80                + sizeof(struct smp_request)
  81                + sizeof(struct smp_response)
  82                + sizeof(struct scu_task_context)
  83                + SMP_CACHE_BYTES;
  84 }
  85
  86 /**
  87  * scic_sds_smp_request_get_command_buffer() -
  88  *
  89  * This macro returns the address of the smp command buffer in the smp request
  90  * memory. No need to cast to SMP request type.
  91  */
  92 #define scic_sds_smp_request_get_command_buffer(memory) \
  93         (((char *)(memory)) + sizeof(struct scic_sds_request))
  94
  95 /**
  96  * scic_sds_smp_request_get_response_buffer() -
  97  *
  98  * This macro returns the address of the smp response buffer in the smp request
  99  * memory.
 100  */
 101 #define scic_sds_smp_request_get_response_buffer(memory) \
 102         (((char *)(scic_sds_smp_request_get_command_buffer(memory))) \
 103          + sizeof(struct smp_request))
 104
 105 /**
 106  * scic_sds_smp_request_get_task_context_buffer() -
 107  *
 108  * This macro returs the task context buffer for the SMP request.
 109  */
 110 #define scic_sds_smp_request_get_task_context_buffer(memory) \
 111         ((struct scu_task_context *)(\
 112                  ((char *)(scic_sds_smp_request_get_response_buffer(memory))) \
 113                  + sizeof(struct smp_response) \
 114                  ))
 115
 116
 117
 118 /**
 119  * This method build the remainder of the IO request object.
 120  * @sci_req: This parameter specifies the request object being constructed.
 121  *
 122  * The scic_sds_general_request_construct() must be called before this call is
 123  * valid. none
 124  */
 125
 126 void scic_sds_smp_request_assign_buffers(
 127         struct scic_sds_request *sci_req)
 128 {
 129         /* Assign all of the buffer pointers */
 130         sci_req->command_buffer =
 131                 scic_sds_smp_request_get_command_buffer(sci_req);
 132         sci_req->response_buffer =
 133                 scic_sds_smp_request_get_response_buffer(sci_req);
 134         sci_req->sgl_element_pair_buffer = NULL;
 135
 136         if (sci_req->was_tag_assigned_by_user == false) {
 137                 sci_req->task_context_buffer =
 138                         scic_sds_smp_request_get_task_context_buffer(sci_req);
 139                 sci_req->task_context_buffer =
 140                         PTR_ALIGN(sci_req->task_context_buffer, SMP_CACHE_BYTES);
 141         }
 142
 143 }
 144
 145 /**
 146  * This method is called by the SCI user to build an SMP pass-through IO
 147  *    request.
 148  * @scic_smp_request: This parameter specifies the handle to the io request
 149  *    object to be built.
 150  * @passthru_cb: This parameter specifies the pointer to the callback structure
 151  *    that contains the function pointers
 152  *
 153  * - The user must have previously called scic_io_request_construct() on the
 154  * supplied IO request. Indicate if the controller successfully built the IO
 155  * request.
 156  */
 157
 158 /**
 159  * This method will fill in the SCU Task Context for a SMP request. The
 160  *    following important settings are utilized: -# task_type ==
 161  *    SCU_TASK_TYPE_SMP.  This simply indicates that a normal request type
 162  *    (i.e. non-raw frame) is being utilized to perform task management. -#
 163  *    control_frame == 1.  This ensures that the proper endianess is set so
 164  *    that the bytes are transmitted in the right order for a smp request frame.
 165  * @sci_req: This parameter specifies the smp request object being
 166  *    constructed.
 167  *
 168  */
 169 static void scu_smp_request_construct_task_context(
 170         struct scic_sds_request *sds_request,
 171         struct smp_request *smp_request)
 172 {
 173         dma_addr_t dma_addr;
 174         struct scic_sds_controller *controller;
 175         struct scic_sds_remote_device *sci_dev;
 176         struct scic_sds_port *target_port;
 177         struct scu_task_context *task_context;
 178
 179         /* byte swap the smp request. */
 180         scic_word_copy_with_swap(sds_request->command_buffer,
 181                                  (u32 *)smp_request,
 182                                  sizeof(struct smp_request) / sizeof(u32));
 183
 184         task_context = scic_sds_request_get_task_context(sds_request);
 185
 186         controller = scic_sds_request_get_controller(sds_request);
 187         sci_dev = scic_sds_request_get_device(sds_request);
 188         target_port = scic_sds_request_get_port(sds_request);
 189
 190         /*
 191          * Fill in the TC with the its required data
 192          * 00h
 193          */
 194         task_context->priority = 0;
 195         task_context->initiator_request = 1;
 196         task_context->connection_rate =
 197                 scic_remote_device_get_connection_rate(sci_dev);
 198         task_context->protocol_engine_index =
 199                 scic_sds_controller_get_protocol_engine_group(controller);
 200         task_context->logical_port_index =
 201                 scic_sds_port_get_index(target_port);
 202         task_context->protocol_type = SCU_TASK_CONTEXT_PROTOCOL_SMP;
 203         task_context->abort = 0;
 204         task_context->valid = SCU_TASK_CONTEXT_VALID;
 205         task_context->context_type = SCU_TASK_CONTEXT_TYPE;
 206
 207         /* 04h */
 208         task_context->remote_node_index = sci_dev->rnc.remote_node_index;
 209         task_context->command_code = 0;
 210         task_context->task_type = SCU_TASK_TYPE_SMP_REQUEST;
 211
 212         /* 08h */
 213         task_context->link_layer_control = 0;
 214         task_context->do_not_dma_ssp_good_response = 1;
 215         task_context->strict_ordering = 0;
 216         task_context->control_frame = 1;
 217         task_context->timeout_enable = 0;
 218         task_context->block_guard_enable = 0;
 219
 220         /* 0ch */
 221         task_context->address_modifier = 0;
 222
 223         /* 10h */
 224         task_context->ssp_command_iu_length =
 225                 smp_request->header.request_length;
 226
 227         /* 14h */
 228         task_context->transfer_length_bytes = 0;
 229
 230         /*
 231          * 18h ~ 30h, protocol specific
 232          * since commandIU has been build by framework at this point, we just
 233          * copy the frist DWord from command IU to this location. */
 234         memcpy((void *)(&task_context->type.smp),
 235                sds_request->command_buffer,
 236                sizeof(u32));
 237
 238         /*
 239          * 40h
 240          * "For SMP you could program it to zero. We would prefer that way
 241          * so that done code will be consistent." - Venki
 242          */
 243         task_context->task_phase = 0;
 244
 245         if (sds_request->was_tag_assigned_by_user) {
 246                 /*
 247                  * Build the task context now since we have already read
 248                  * the data
 249                  */
 250                 sds_request->post_context =
 251                         (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
 252                          (scic_sds_controller_get_protocol_engine_group(
 253                                                         controller) <<
 254                           SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
 255                          (scic_sds_port_get_index(target_port) <<
 256                           SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT) |
 257                          scic_sds_io_tag_get_index(sds_request->io_tag));
 258         } else {
 259                 /*
 260                  * Build the task context now since we have already read
 261                  * the data.
 262                  * I/O tag index is not assigned because we have to wait
 263                  * until we get a TCi.
 264                  */
 265                 sds_request->post_context =
 266                         (SCU_CONTEXT_COMMAND_REQUEST_TYPE_POST_TC |
 267                          (scic_sds_controller_get_protocol_engine_group(
 268                                                         controller) <<
 269                           SCU_CONTEXT_COMMAND_PROTOCOL_ENGINE_GROUP_SHIFT) |
 270                          (scic_sds_port_get_index(target_port) <<
 271                           SCU_CONTEXT_COMMAND_LOGICAL_PORT_SHIFT));
 272         }
 273
 274         /*
 275          * Copy the physical address for the command buffer to the SCU Task
 276          * Context command buffer should not contain command header.
 277          */
 278         dma_addr = scic_io_request_get_dma_addr(sds_request,
 279                                                 (char *)
 280                                                 (sds_request->command_buffer) +
 281                                                 sizeof(u32));
 282
 283         task_context->command_iu_upper = upper_32_bits(dma_addr);
 284         task_context->command_iu_lower = lower_32_bits(dma_addr);
 285
 286         /* SMP response comes as UF, so no need to set response IU address. */
 287         task_context->response_iu_upper = 0;
 288         task_context->response_iu_lower = 0;
 289 }
 290
 291 /**
 292  * This method processes an unsolicited frame while the SMP request is waiting
 293  *    for a response frame.  It will copy the response data, release the
 294  *    unsolicited frame, and transition the request to the
 295  *    SCI_BASE_REQUEST_STATE_COMPLETED state.
 296  * @sci_req: This parameter specifies the request for which the
 297  *    unsolicited frame was received.
 298  * @frame_index: This parameter indicates the unsolicited frame index that
 299  *    should contain the response.
 300  *
 301  * This method returns an indication of whether the response frame was handled
 302  * successfully or not. SCI_SUCCESS Currently this value is always returned and
 303  * indicates successful processing of the TC response.
 304  */
 305 static enum sci_status scic_sds_smp_request_await_response_frame_handler(
 306         struct scic_sds_request *sci_req,
 307         u32 frame_index)
 308 {
 309         enum sci_status status;
 310         void *frame_header;
 311         struct smp_response_header *rsp_hdr;
 312         u8 *user_smp_buffer = sci_req->response_buffer;
 313
 314         status = scic_sds_unsolicited_frame_control_get_header(
 315                 &(scic_sds_request_get_controller(sci_req)->uf_control),
 316                 frame_index,
 317                 &frame_header
 318                 );
 319
 320         /* byte swap the header. */
 321         scic_word_copy_with_swap(
 322                 (u32 *)user_smp_buffer,
 323                 frame_header,
 324                 sizeof(struct smp_response_header) / sizeof(u32)
 325                 );
 326         rsp_hdr = (struct smp_response_header *)user_smp_buffer;
 327
 328         if (rsp_hdr->smp_frame_type == SMP_FRAME_TYPE_RESPONSE) {
 329                 void *smp_response_buffer;
 330
 331                 status = scic_sds_unsolicited_frame_control_get_buffer(
 332                         &(scic_sds_request_get_controller(sci_req)->uf_control),
 333                         frame_index,
 334                         &smp_response_buffer
 335                         );
 336
 337                 scic_word_copy_with_swap(
 338                         (u32 *)(user_smp_buffer + sizeof(struct smp_response_header)),
 339                         smp_response_buffer,
 340                         sizeof(union smp_response_body) / sizeof(u32)
 341                         );
 342                 /*
 343                  * Don't need to copy to user space. User instead will refer to
 344                  * core request's response buffer. */
 345
 346                 /*
 347                  * copy the smp response to framework smp request's response buffer.
 348                  * scic_sds_smp_request_copy_response(sci_req); */
 349
 350                 scic_sds_request_set_status(
 351                         sci_req, SCU_TASK_DONE_GOOD, SCI_SUCCESS
 352                         );
 353
 354                 sci_base_state_machine_change_state(
 355                         &sci_req->started_substate_machine,
 356                         SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION
 357                         );
 358         } else {
 359                 /* This was not a response frame why did it get forwarded? */
 360                 dev_err(scic_to_dev(sci_req->owning_controller),
 361                         "%s: SCIC SMP Request 0x%p received unexpected frame "
 362                         "%d type 0x%02x\n",
 363                         __func__,
 364                         sci_req,
 365                         frame_index,
 366                         rsp_hdr->smp_frame_type);
 367
 368                 scic_sds_request_set_status(
 369                         sci_req,
 370                         SCU_TASK_DONE_SMP_FRM_TYPE_ERR,
 371                         SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR
 372                         );
 373
 374                 sci_base_state_machine_change_state(
 375                         &sci_req->state_machine,
 376                         SCI_BASE_REQUEST_STATE_COMPLETED
 377                         );
 378         }
 379
 380         scic_sds_controller_release_frame(
 381                 sci_req->owning_controller, frame_index
 382                 );
 383
 384         return SCI_SUCCESS;
 385 }
 386
 387
 388 /**
 389  * This method processes an abnormal TC completion while the SMP request is
 390  *    waiting for a response frame.  It decides what happened to the IO based
 391  *    on TC completion status.
 392  * @sci_req: This parameter specifies the request for which the TC
 393  *    completion was received.
 394  * @completion_code: This parameter indicates the completion status information
 395  *    for the TC.
 396  *
 397  * Indicate if the tc completion handler was successful. SCI_SUCCESS currently
 398  * this method always returns success.
 399  */
 400 static enum sci_status scic_sds_smp_request_await_response_tc_completion_handler(
 401         struct scic_sds_request *sci_req,
 402         u32 completion_code)
 403 {
 404         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
 405         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
 406                 /*
 407                  * In the AWAIT RESPONSE state, any TC completion is unexpected.
 408                  * but if the TC has success status, we complete the IO anyway. */
 409                 scic_sds_request_set_status(
 410                         sci_req, SCU_TASK_DONE_GOOD, SCI_SUCCESS
 411                         );
 412
 413                 sci_base_state_machine_change_state(
 414                         &sci_req->state_machine,
 415                         SCI_BASE_REQUEST_STATE_COMPLETED);
 416                 break;
 417
 418         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_RESP_TO_ERR):
 419         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_UFI_ERR):
 420         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_FRM_TYPE_ERR):
 421         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_SMP_LL_RX_ERR):
 422                 /*
 423                  * These status has been seen in a specific LSI expander, which sometimes
 424                  * is not able to send smp response within 2 ms. This causes our hardware
 425                  * break the connection and set TC completion with one of these SMP_XXX_XX_ERR
 426                  * status. For these type of error, we ask scic user to retry the request. */
 427                 scic_sds_request_set_status(
 428                         sci_req, SCU_TASK_DONE_SMP_RESP_TO_ERR, SCI_FAILURE_RETRY_REQUIRED
 429                         );
 430
 431                 sci_base_state_machine_change_state(
 432                         &sci_req->state_machine,
 433                         SCI_BASE_REQUEST_STATE_COMPLETED);
 434                 break;
 435
 436         default:
 437                 /*
 438                  * All other completion status cause the IO to be complete.  If a NAK
 439                  * was received, then it is up to the user to retry the request. */
 440                 scic_sds_request_set_status(
 441                         sci_req,
 442                         SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
 443                         SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR
 444                         );
 445
 446                 sci_base_state_machine_change_state(
 447                         &sci_req->state_machine,
 448                         SCI_BASE_REQUEST_STATE_COMPLETED);
 449                 break;
 450         }
 451
 452         return SCI_SUCCESS;
 453 }
 454
 455
 456 /**
 457  * This method processes the completions transport layer (TL) status to
 458  *    determine if the SMP request was sent successfully. If the SMP request
 459  *    was sent successfully, then the state for the SMP request transits to
 460  *    waiting for a response frame.
 461  * @sci_req: This parameter specifies the request for which the TC
 462  *    completion was received.
 463  * @completion_code: This parameter indicates the completion status information
 464  *    for the TC.
 465  *
 466  * Indicate if the tc completion handler was successful. SCI_SUCCESS currently
 467  * this method always returns success.
 468  */
 469 static enum sci_status scic_sds_smp_request_await_tc_completion_tc_completion_handler(
 470         struct scic_sds_request *sci_req,
 471         u32 completion_code)
 472 {
 473         switch (SCU_GET_COMPLETION_TL_STATUS(completion_code)) {
 474         case SCU_MAKE_COMPLETION_STATUS(SCU_TASK_DONE_GOOD):
 475                 scic_sds_request_set_status(
 476                         sci_req, SCU_TASK_DONE_GOOD, SCI_SUCCESS
 477                         );
 478
 479                 sci_base_state_machine_change_state(
 480                         &sci_req->state_machine,
 481                         SCI_BASE_REQUEST_STATE_COMPLETED);
 482                 break;
 483
 484         default:
 485                 /*
 486                  * All other completion status cause the IO to be complete.  If a NAK
 487                  * was received, then it is up to the user to retry the request. */
 488                 scic_sds_request_set_status(
 489                         sci_req,
 490                         SCU_NORMALIZE_COMPLETION_STATUS(completion_code),
 491                         SCI_FAILURE_CONTROLLER_SPECIFIC_IO_ERR
 492                         );
 493
 494                 sci_base_state_machine_change_state(
 495                         &sci_req->state_machine,
 496                         SCI_BASE_REQUEST_STATE_COMPLETED);
 497                 break;
 498         }
 499
 500         return SCI_SUCCESS;
 501 }
 502
 503
 504 static const struct scic_sds_io_request_state_handler scic_sds_smp_request_started_substate_handler_table[] = {
 505         [SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE] = {
 506                 .abort_handler          = scic_sds_request_started_state_abort_handler,
 507                 .tc_completion_handler  = scic_sds_smp_request_await_response_tc_completion_handler,
 508                 .frame_handler          = scic_sds_smp_request_await_response_frame_handler,
 509         },
 510         [SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION] = {
 511                 .abort_handler          = scic_sds_request_started_state_abort_handler,
 512                 .tc_completion_handler  =  scic_sds_smp_request_await_tc_completion_tc_completion_handler,
 513         }
 514 };
 515
 516 /**
 517  * This method performs the actions required when entering the
 518  *    SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_RESPONSE sub-state. This
 519  *    includes setting the IO request state handlers for this sub-state.
 520  * @object: This parameter specifies the request object for which the sub-state
 521  *    change is occurring.
 522  *
 523  * none.
 524  */
 525 static void scic_sds_smp_request_started_await_response_substate_enter(
 526         void *object)
 527 {
 528         struct scic_sds_request *sci_req = object;
 529
 530         SET_STATE_HANDLER(
 531                 sci_req,
 532                 scic_sds_smp_request_started_substate_handler_table,
 533                 SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE
 534                 );
 535 }
 536
 537 /**
 538  * This method performs the actions required when entering the
 539  *    SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION sub-state.
 540  *    This includes setting the SMP request state handlers for this sub-state.
 541  * @object: This parameter specifies the request object for which the sub-state
 542  *    change is occurring.
 543  *
 544  * none.
 545  */
 546 static void scic_sds_smp_request_started_await_tc_completion_substate_enter(
 547         void *object)
 548 {
 549         struct scic_sds_request *sci_req = object;
 550
 551         SET_STATE_HANDLER(
 552                 sci_req,
 553                 scic_sds_smp_request_started_substate_handler_table,
 554                 SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION
 555                 );
 556 }
 557
 558 static const struct sci_base_state scic_sds_smp_request_started_substate_table[] = {
 559         [SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE] = {
 560                 .enter_state = scic_sds_smp_request_started_await_response_substate_enter,
 561         },
 562         [SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_TC_COMPLETION] = {
 563                 .enter_state = scic_sds_smp_request_started_await_tc_completion_substate_enter,
 564         },
 565 };
 566
 567 /**
 568  * This method is called by the SCI user to build an SMP IO request.
 569  *
 570  * - The user must have previously called scic_io_request_construct() on the
 571  * supplied IO request. Indicate if the controller successfully built the IO
 572  * request. SCI_SUCCESS This value is returned if the IO request was
 573  * successfully built. SCI_FAILURE_UNSUPPORTED_PROTOCOL This value is returned
 574  * if the remote_device does not support the SMP protocol.
 575  * SCI_FAILURE_INVALID_ASSOCIATION This value is returned if the user did not
 576  * properly set the association between the SCIC IO request and the user's IO
 577  * request.  Please refer to the sci_object_set_association() routine for more
 578  * information.
 579  */
 580 enum sci_status scic_io_request_construct_smp(struct scic_sds_request *sci_req)
 581 {
 582         struct smp_request *smp_req = kmalloc(sizeof(*smp_req), GFP_KERNEL);
 583
 584         if (!smp_req)
 585                 return SCI_FAILURE_INSUFFICIENT_RESOURCES;
 586
 587         sci_req->protocol                     = SCIC_SMP_PROTOCOL;
 588         sci_req->has_started_substate_machine = true;
 589
 590         /* Construct the started sub-state machine. */
 591         sci_base_state_machine_construct(
 592                 &sci_req->started_substate_machine,
 593                 sci_req,
 594                 scic_sds_smp_request_started_substate_table,
 595                 SCIC_SDS_SMP_REQUEST_STARTED_SUBSTATE_AWAIT_RESPONSE
 596                 );
 597
 598         /* Construct the SMP SCU Task Context */
 599         memcpy(smp_req, sci_req->command_buffer, sizeof(*smp_req));
 600
 601         /*
 602          * Look at the SMP requests' header fields; for certain SAS 1.x SMP
 603          * functions under SAS 2.0, a zero request length really indicates
 604          * a non-zero default length. */
 605         if (smp_req->header.request_length == 0) {
 606                 switch (smp_req->header.function) {
 607                 case SMP_FUNCTION_DISCOVER:
 608                 case SMP_FUNCTION_REPORT_PHY_ERROR_LOG:
 609                 case SMP_FUNCTION_REPORT_PHY_SATA:
 610                 case SMP_FUNCTION_REPORT_ROUTE_INFORMATION:
 611                         smp_req->header.request_length = 2;
 612                         break;
 613                 case SMP_FUNCTION_CONFIGURE_ROUTE_INFORMATION:
 614                 case SMP_FUNCTION_PHY_CONTROL:
 615                 case SMP_FUNCTION_PHY_TEST:
 616                         smp_req->header.request_length = 9;
 617                         break;
 618                         /* Default - zero is a valid default for 2.0. */
 619                 }
 620         }
 621
 622         scu_smp_request_construct_task_context(sci_req, smp_req);
 623
 624         sci_base_state_machine_change_state(&sci_req->state_machine,
 625                 SCI_BASE_REQUEST_STATE_CONSTRUCTED);
 626
 627         kfree(smp_req);
 628
 629         return SCI_SUCCESS;
 630 }