drivers/scsi/isci/task.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 <linux/completion.h>
  57 #include <linux/irqflags.h>
  58 #include "sas.h"
  59 #include <scsi/libsas.h>
  60 #include "remote_device.h"
  61 #include "remote_node_context.h"
  62 #include "isci.h"
  63 #include "request.h"
  64 #include "task.h"
  65 #include "host.h"
  66
  67 /**
  68 * isci_task_refuse() - complete the request to the upper layer driver in
  69 *     the case where an I/O needs to be completed back in the submit path.
  70 * @ihost: host on which the the request was queued
  71 * @task: request to complete
  72 * @response: response code for the completed task.
  73 * @status: status code for the completed task.
  74 *
  75 */
  76 static void isci_task_refuse(struct isci_host *ihost, struct sas_task *task,
  77                              enum service_response response,
  78                              enum exec_status status)
  79
  80 {
  81         enum isci_completion_selection disposition;
  82
  83         disposition = isci_perform_normal_io_completion;
  84         disposition = isci_task_set_completion_status(task, response, status,
  85                                                       disposition);
  86
  87         /* Tasks aborted specifically by a call to the lldd_abort_task
  88          * function should not be completed to the host in the regular path.
  89          */
  90         switch (disposition) {
  91         case isci_perform_normal_io_completion:
  92                 /* Normal notification (task_done) */
  93                 dev_dbg(&ihost->pdev->dev,
  94                         "%s: Normal - task = %p, response=%d, "
  95                         "status=%d\n",
  96                         __func__, task, response, status);
  97
  98                 task->lldd_task = NULL;
  99                 task->task_done(task);
 100                 break;
 101
 102         case isci_perform_aborted_io_completion:
 103                 /*
 104                  * No notification because this request is already in the
 105                  * abort path.
 106                  */
 107                 dev_dbg(&ihost->pdev->dev,
 108                         "%s: Aborted - task = %p, response=%d, "
 109                         "status=%d\n",
 110                         __func__, task, response, status);
 111                 break;
 112
 113         case isci_perform_error_io_completion:
 114                 /* Use sas_task_abort */
 115                 dev_dbg(&ihost->pdev->dev,
 116                         "%s: Error - task = %p, response=%d, "
 117                         "status=%d\n",
 118                         __func__, task, response, status);
 119                 sas_task_abort(task);
 120                 break;
 121
 122         default:
 123                 dev_dbg(&ihost->pdev->dev,
 124                         "%s: isci task notification default case!",
 125                         __func__);
 126                 sas_task_abort(task);
 127                 break;
 128         }
 129 }
 130
 131 #define for_each_sas_task(num, task) \
 132         for (; num > 0; num--,\
 133              task = list_entry(task->list.next, struct sas_task, list))
 134
 135
 136 static inline int isci_device_io_ready(struct isci_remote_device *idev,
 137                                        struct sas_task *task)
 138 {
 139         return idev ? test_bit(IDEV_IO_READY, &idev->flags) ||
 140                       (test_bit(IDEV_IO_NCQERROR, &idev->flags) &&
 141                        isci_task_is_ncq_recovery(task))
 142                     : 0;
 143 }
 144 /**
 145  * isci_task_execute_task() - This function is one of the SAS Domain Template
 146  *    functions. This function is called by libsas to send a task down to
 147  *    hardware.
 148  * @task: This parameter specifies the SAS task to send.
 149  * @num: This parameter specifies the number of tasks to queue.
 150  * @gfp_flags: This parameter specifies the context of this call.
 151  *
 152  * status, zero indicates success.
 153  */
 154 int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
 155 {
 156         struct isci_host *ihost = dev_to_ihost(task->dev);
 157         struct isci_remote_device *idev;
 158         unsigned long flags;
 159         bool io_ready;
 160         u16 tag;
 161
 162         dev_dbg(&ihost->pdev->dev, "%s: num=%d\n", __func__, num);
 163
 164         for_each_sas_task(num, task) {
 165                 enum sci_status status = SCI_FAILURE;
 166
 167                 spin_lock_irqsave(&ihost->scic_lock, flags);
 168                 idev = isci_lookup_device(task->dev);
 169                 io_ready = isci_device_io_ready(idev, task);
 170                 tag = isci_alloc_tag(ihost);
 171                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 172
 173                 dev_dbg(&ihost->pdev->dev,
 174                         "task: %p, num: %d dev: %p idev: %p:%#lx cmd = %p\n",
 175                         task, num, task->dev, idev, idev ? idev->flags : 0,
 176                         task->uldd_task);
 177
 178                 if (!idev) {
 179                         isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
 180                                          SAS_DEVICE_UNKNOWN);
 181                 } else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
 182                         /* Indicate QUEUE_FULL so that the scsi midlayer
 183                          * retries.
 184                           */
 185                         isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
 186                                          SAS_QUEUE_FULL);
 187                 } else {
 188                         /* There is a device and it's ready for I/O. */
 189                         spin_lock_irqsave(&task->task_state_lock, flags);
 190
 191                         if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 192                                 /* The I/O was aborted. */
 193                                 spin_unlock_irqrestore(&task->task_state_lock,
 194                                                        flags);
 195
 196                                 isci_task_refuse(ihost, task,
 197                                                  SAS_TASK_UNDELIVERED,
 198                                                  SAM_STAT_TASK_ABORTED);
 199                         } else {
 200                                 task->task_state_flags |= SAS_TASK_AT_INITIATOR;
 201                                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 202
 203                                 /* build and send the request. */
 204                                 status = isci_request_execute(ihost, idev, task, tag);
 205
 206                                 if (status != SCI_SUCCESS) {
 207
 208                                         spin_lock_irqsave(&task->task_state_lock, flags);
 209                                         /* Did not really start this command. */
 210                                         task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 211                                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 212
 213                                         if (test_bit(IDEV_GONE, &idev->flags)) {
 214
 215                                                 /* Indicate that the device
 216                                                  * is gone.
 217                                                  */
 218                                                 isci_task_refuse(ihost, task,
 219                                                         SAS_TASK_UNDELIVERED,
 220                                                         SAS_DEVICE_UNKNOWN);
 221                                         } else {
 222                                                 /* Indicate QUEUE_FULL so that
 223                                                  * the scsi midlayer retries.
 224                                                  * If the request failed for
 225                                                  * remote device reasons, it
 226                                                  * gets returned as
 227                                                  * SAS_TASK_UNDELIVERED next
 228                                                  * time through.
 229                                                  */
 230                                                 isci_task_refuse(ihost, task,
 231                                                         SAS_TASK_COMPLETE,
 232                                                         SAS_QUEUE_FULL);
 233                                         }
 234                                 }
 235                         }
 236                 }
 237                 if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
 238                         spin_lock_irqsave(&ihost->scic_lock, flags);
 239                         /* command never hit the device, so just free
 240                          * the tci and skip the sequence increment
 241                          */
 242                         isci_tci_free(ihost, ISCI_TAG_TCI(tag));
 243                         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 244                 }
 245                 isci_put_device(idev);
 246         }
 247         return 0;
 248 }
 249
 250 static struct isci_request *isci_task_request_build(struct isci_host *ihost,
 251                                                     struct isci_remote_device *idev,
 252                                                     u16 tag, struct isci_tmf *isci_tmf)
 253 {
 254         enum sci_status status = SCI_FAILURE;
 255         struct isci_request *ireq = NULL;
 256         struct domain_device *dev;
 257
 258         dev_dbg(&ihost->pdev->dev,
 259                 "%s: isci_tmf = %p\n", __func__, isci_tmf);
 260
 261         dev = idev->domain_dev;
 262
 263         /* do common allocation and init of request object. */
 264         ireq = isci_tmf_request_from_tag(ihost, isci_tmf, tag);
 265         if (!ireq)
 266                 return NULL;
 267
 268         /* let the core do it's construct. */
 269         status = sci_task_request_construct(ihost, idev, tag,
 270                                              ireq);
 271
 272         if (status != SCI_SUCCESS) {
 273                 dev_warn(&ihost->pdev->dev,
 274                          "%s: sci_task_request_construct failed - "
 275                          "status = 0x%x\n",
 276                          __func__,
 277                          status);
 278                 return NULL;
 279         }
 280
 281         /* XXX convert to get this from task->tproto like other drivers */
 282         if (dev->dev_type == SAS_END_DEV) {
 283                 isci_tmf->proto = SAS_PROTOCOL_SSP;
 284                 status = sci_task_request_construct_ssp(ireq);
 285                 if (status != SCI_SUCCESS)
 286                         return NULL;
 287         }
 288
 289         return ireq;
 290 }
 291
 292 /**
 293 * isci_request_mark_zombie() - This function must be called with scic_lock held.
 294 */
 295 static void isci_request_mark_zombie(struct isci_host *ihost, struct isci_request *ireq)
 296 {
 297         struct completion *tmf_completion = NULL;
 298         struct completion *req_completion;
 299
 300         /* Set the request state to "dead". */
 301         ireq->status = dead;
 302
 303         req_completion = ireq->io_request_completion;
 304         ireq->io_request_completion = NULL;
 305
 306         if (test_bit(IREQ_TMF, &ireq->flags)) {
 307                 /* Break links with the TMF request. */
 308                 struct isci_tmf *tmf = isci_request_access_tmf(ireq);
 309
 310                 /* In the case where a task request is dying,
 311                  * the thread waiting on the complete will sit and
 312                  * timeout unless we wake it now.  Since the TMF
 313                  * has a default error status, complete it here
 314                  * to wake the waiting thread.
 315                  */
 316                 if (tmf) {
 317                         tmf_completion = tmf->complete;
 318                         tmf->complete = NULL;
 319                 }
 320                 ireq->ttype_ptr.tmf_task_ptr = NULL;
 321                 dev_dbg(&ihost->pdev->dev, "%s: tmf_code %d, managed tag %#x\n",
 322                         __func__, tmf->tmf_code, tmf->io_tag);
 323         } else {
 324                 /* Break links with the sas_task - the callback is done
 325                  * elsewhere.
 326                  */
 327                 struct sas_task *task = isci_request_access_task(ireq);
 328
 329                 if (task)
 330                         task->lldd_task = NULL;
 331
 332                 ireq->ttype_ptr.io_task_ptr = NULL;
 333         }
 334
 335         dev_warn(&ihost->pdev->dev, "task context unrecoverable (tag: %#x)\n",
 336                  ireq->io_tag);
 337
 338         /* Don't force waiting threads to timeout. */
 339         if (req_completion)
 340                 complete(req_completion);
 341
 342         if (tmf_completion != NULL)
 343                 complete(tmf_completion);
 344 }
 345
 346 static int isci_task_execute_tmf(struct isci_host *ihost,
 347                                  struct isci_remote_device *idev,
 348                                  struct isci_tmf *tmf, unsigned long timeout_ms)
 349 {
 350         DECLARE_COMPLETION_ONSTACK(completion);
 351         enum sci_task_status status = SCI_TASK_FAILURE;
 352         struct isci_request *ireq;
 353         int ret = TMF_RESP_FUNC_FAILED;
 354         unsigned long flags;
 355         unsigned long timeleft;
 356         u16 tag;
 357
 358         spin_lock_irqsave(&ihost->scic_lock, flags);
 359         tag = isci_alloc_tag(ihost);
 360         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 361
 362         if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
 363                 return ret;
 364
 365         /* sanity check, return TMF_RESP_FUNC_FAILED
 366          * if the device is not there and ready.
 367          */
 368         if (!idev ||
 369             (!test_bit(IDEV_IO_READY, &idev->flags) &&
 370              !test_bit(IDEV_IO_NCQERROR, &idev->flags))) {
 371                 dev_dbg(&ihost->pdev->dev,
 372                         "%s: idev = %p not ready (%#lx)\n",
 373                         __func__,
 374                         idev, idev ? idev->flags : 0);
 375                 goto err_tci;
 376         } else
 377                 dev_dbg(&ihost->pdev->dev,
 378                         "%s: idev = %p\n",
 379                         __func__, idev);
 380
 381         /* Assign the pointer to the TMF's completion kernel wait structure. */
 382         tmf->complete = &completion;
 383         tmf->status = SCI_FAILURE_TIMEOUT;
 384
 385         ireq = isci_task_request_build(ihost, idev, tag, tmf);
 386         if (!ireq)
 387                 goto err_tci;
 388
 389         spin_lock_irqsave(&ihost->scic_lock, flags);
 390
 391         /* start the TMF io. */
 392         status = sci_controller_start_task(ihost, idev, ireq);
 393
 394         if (status != SCI_TASK_SUCCESS) {
 395                 dev_dbg(&ihost->pdev->dev,
 396                          "%s: start_io failed - status = 0x%x, request = %p\n",
 397                          __func__,
 398                          status,
 399                          ireq);
 400                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 401                 goto err_tci;
 402         }
 403
 404         if (tmf->cb_state_func != NULL)
 405                 tmf->cb_state_func(isci_tmf_started, tmf, tmf->cb_data);
 406
 407         isci_request_change_state(ireq, started);
 408
 409         /* add the request to the remote device request list. */
 410         list_add(&ireq->dev_node, &idev->reqs_in_process);
 411
 412         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 413
 414         /* Wait for the TMF to complete, or a timeout. */
 415         timeleft = wait_for_completion_timeout(&completion,
 416                                                msecs_to_jiffies(timeout_ms));
 417
 418         if (timeleft == 0) {
 419                 /* The TMF did not complete - this could be because
 420                  * of an unplug.  Terminate the TMF request now.
 421                  */
 422                 spin_lock_irqsave(&ihost->scic_lock, flags);
 423
 424                 if (tmf->cb_state_func != NULL)
 425                         tmf->cb_state_func(isci_tmf_timed_out, tmf,
 426                                            tmf->cb_data);
 427
 428                 sci_controller_terminate_request(ihost, idev, ireq);
 429
 430                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 431
 432                 timeleft = wait_for_completion_timeout(
 433                         &completion,
 434                         msecs_to_jiffies(ISCI_TERMINATION_TIMEOUT_MSEC));
 435
 436                 if (!timeleft) {
 437                         /* Strange condition - the termination of the TMF
 438                          * request timed-out.
 439                          */
 440                         spin_lock_irqsave(&ihost->scic_lock, flags);
 441
 442                         /* If the TMF status has not changed, kill it. */
 443                         if (tmf->status == SCI_FAILURE_TIMEOUT)
 444                                 isci_request_mark_zombie(ihost, ireq);
 445
 446                         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 447                 }
 448         }
 449
 450         isci_print_tmf(ihost, tmf);
 451
 452         if (tmf->status == SCI_SUCCESS)
 453                 ret =  TMF_RESP_FUNC_COMPLETE;
 454         else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
 455                 dev_dbg(&ihost->pdev->dev,
 456                         "%s: tmf.status == "
 457                         "SCI_FAILURE_IO_RESPONSE_VALID\n",
 458                         __func__);
 459                 ret =  TMF_RESP_FUNC_COMPLETE;
 460         }
 461         /* Else - leave the default "failed" status alone. */
 462
 463         dev_dbg(&ihost->pdev->dev,
 464                 "%s: completed request = %p\n",
 465                 __func__,
 466                 ireq);
 467
 468         return ret;
 469
 470  err_tci:
 471         spin_lock_irqsave(&ihost->scic_lock, flags);
 472         isci_tci_free(ihost, ISCI_TAG_TCI(tag));
 473         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 474
 475         return ret;
 476 }
 477
 478 static void isci_task_build_tmf(struct isci_tmf *tmf,
 479                                 enum isci_tmf_function_codes code,
 480                                 void (*tmf_sent_cb)(enum isci_tmf_cb_state,
 481                                                     struct isci_tmf *,
 482                                                     void *),
 483                                 void *cb_data)
 484 {
 485         memset(tmf, 0, sizeof(*tmf));
 486
 487         tmf->tmf_code      = code;
 488         tmf->cb_state_func = tmf_sent_cb;
 489         tmf->cb_data       = cb_data;
 490 }
 491
 492 static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf,
 493                                            enum isci_tmf_function_codes code,
 494                                            void (*tmf_sent_cb)(enum isci_tmf_cb_state,
 495                                                                struct isci_tmf *,
 496                                                                void *),
 497                                            struct isci_request *old_request)
 498 {
 499         isci_task_build_tmf(tmf, code, tmf_sent_cb, old_request);
 500         tmf->io_tag = old_request->io_tag;
 501 }
 502
 503 /**
 504  * isci_task_validate_request_to_abort() - This function checks the given I/O
 505  *    against the "started" state.  If the request is still "started", it's
 506  *    state is changed to aborted. NOTE: isci_host->scic_lock MUST BE HELD
 507  *    BEFORE CALLING THIS FUNCTION.
 508  * @isci_request: This parameter specifies the request object to control.
 509  * @isci_host: This parameter specifies the ISCI host object
 510  * @isci_device: This is the device to which the request is pending.
 511  * @aborted_io_completion: This is a completion structure that will be added to
 512  *    the request in case it is changed to aborting; this completion is
 513  *    triggered when the request is fully completed.
 514  *
 515  * Either "started" on successful change of the task status to "aborted", or
 516  * "unallocated" if the task cannot be controlled.
 517  */
 518 static enum isci_request_status isci_task_validate_request_to_abort(
 519         struct isci_request *isci_request,
 520         struct isci_host *isci_host,
 521         struct isci_remote_device *isci_device,
 522         struct completion *aborted_io_completion)
 523 {
 524         enum isci_request_status old_state = unallocated;
 525
 526         /* Only abort the task if it's in the
 527          *  device's request_in_process list
 528          */
 529         if (isci_request && !list_empty(&isci_request->dev_node)) {
 530                 old_state = isci_request_change_started_to_aborted(
 531                         isci_request, aborted_io_completion);
 532
 533         }
 534
 535         return old_state;
 536 }
 537
 538 static int isci_request_is_dealloc_managed(enum isci_request_status stat)
 539 {
 540         switch (stat) {
 541         case aborted:
 542         case aborting:
 543         case terminating:
 544         case completed:
 545         case dead:
 546                 return true;
 547         default:
 548                 return false;
 549         }
 550 }
 551
 552 /**
 553  * isci_terminate_request_core() - This function will terminate the given
 554  *    request, and wait for it to complete.  This function must only be called
 555  *    from a thread that can wait.  Note that the request is terminated and
 556  *    completed (back to the host, if started there).
 557  * @ihost: This SCU.
 558  * @idev: The target.
 559  * @isci_request: The I/O request to be terminated.
 560  *
 561  */
 562 static void isci_terminate_request_core(struct isci_host *ihost,
 563                                         struct isci_remote_device *idev,
 564                                         struct isci_request *isci_request)
 565 {
 566         enum sci_status status      = SCI_SUCCESS;
 567         bool was_terminated         = false;
 568         bool needs_cleanup_handling = false;
 569         unsigned long     flags;
 570         unsigned long     termination_completed = 1;
 571         struct completion *io_request_completion;
 572
 573         dev_dbg(&ihost->pdev->dev,
 574                 "%s: device = %p; request = %p\n",
 575                 __func__, idev, isci_request);
 576
 577         spin_lock_irqsave(&ihost->scic_lock, flags);
 578
 579         io_request_completion = isci_request->io_request_completion;
 580
 581         /* Note that we are not going to control
 582          * the target to abort the request.
 583          */
 584         set_bit(IREQ_COMPLETE_IN_TARGET, &isci_request->flags);
 585
 586         /* Make sure the request wasn't just sitting around signalling
 587          * device condition (if the request handle is NULL, then the
 588          * request completed but needed additional handling here).
 589          */
 590         if (!test_bit(IREQ_TERMINATED, &isci_request->flags)) {
 591                 was_terminated = true;
 592                 needs_cleanup_handling = true;
 593                 status = sci_controller_terminate_request(ihost,
 594                                                            idev,
 595                                                            isci_request);
 596         }
 597         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 598
 599         /*
 600          * The only time the request to terminate will
 601          * fail is when the io request is completed and
 602          * being aborted.
 603          */
 604         if (status != SCI_SUCCESS) {
 605                 dev_dbg(&ihost->pdev->dev,
 606                         "%s: sci_controller_terminate_request"
 607                         " returned = 0x%x\n",
 608                         __func__, status);
 609
 610                 isci_request->io_request_completion = NULL;
 611
 612         } else {
 613                 if (was_terminated) {
 614                         dev_dbg(&ihost->pdev->dev,
 615                                 "%s: before completion wait (%p/%p)\n",
 616                                 __func__, isci_request, io_request_completion);
 617
 618                         /* Wait here for the request to complete. */
 619                         termination_completed
 620                                 = wait_for_completion_timeout(
 621                                    io_request_completion,
 622                                    msecs_to_jiffies(ISCI_TERMINATION_TIMEOUT_MSEC));
 623
 624                         if (!termination_completed) {
 625
 626                                 /* The request to terminate has timed out.  */
 627                                 spin_lock_irqsave(&ihost->scic_lock, flags);
 628
 629                                 /* Check for state changes. */
 630                                 if (!test_bit(IREQ_TERMINATED,
 631                                               &isci_request->flags)) {
 632
 633                                         /* The best we can do is to have the
 634                                          * request die a silent death if it
 635                                          * ever really completes.
 636                                          */
 637                                         isci_request_mark_zombie(ihost,
 638                                                                  isci_request);
 639                                         needs_cleanup_handling = true;
 640                                 } else
 641                                         termination_completed = 1;
 642
 643                                 spin_unlock_irqrestore(&ihost->scic_lock,
 644                                                        flags);
 645
 646                                 if (!termination_completed) {
 647
 648                                         dev_dbg(&ihost->pdev->dev,
 649                                                 "%s: *** Timeout waiting for "
 650                                                 "termination(%p/%p)\n",
 651                                                 __func__, io_request_completion,
 652                                                 isci_request);
 653
 654                                         /* The request can no longer be referenced
 655                                          * safely since it may go away if the
 656                                          * termination every really does complete.
 657                                          */
 658                                         isci_request = NULL;
 659                                 }
 660                         }
 661                         if (termination_completed)
 662                                 dev_dbg(&ihost->pdev->dev,
 663                                         "%s: after completion wait (%p/%p)\n",
 664                                         __func__, isci_request, io_request_completion);
 665                 }
 666
 667                 if (termination_completed) {
 668
 669                         isci_request->io_request_completion = NULL;
 670
 671                         /* Peek at the status of the request.  This will tell
 672                          * us if there was special handling on the request such that it
 673                          * needs to be detached and freed here.
 674                          */
 675                         spin_lock_irqsave(&isci_request->state_lock, flags);
 676
 677                         needs_cleanup_handling
 678                                 = isci_request_is_dealloc_managed(
 679                                         isci_request->status);
 680
 681                         spin_unlock_irqrestore(&isci_request->state_lock, flags);
 682
 683                 }
 684                 if (needs_cleanup_handling) {
 685
 686                         dev_dbg(&ihost->pdev->dev,
 687                                 "%s: cleanup isci_device=%p, request=%p\n",
 688                                 __func__, idev, isci_request);
 689
 690                         if (isci_request != NULL) {
 691                                 spin_lock_irqsave(&ihost->scic_lock, flags);
 692                                 isci_free_tag(ihost, isci_request->io_tag);
 693                                 isci_request_change_state(isci_request, unallocated);
 694                                 list_del_init(&isci_request->dev_node);
 695                                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 696                         }
 697                 }
 698         }
 699 }
 700
 701 /**
 702  * isci_terminate_pending_requests() - This function will change the all of the
 703  *    requests on the given device's state to "aborting", will terminate the
 704  *    requests, and wait for them to complete.  This function must only be
 705  *    called from a thread that can wait.  Note that the requests are all
 706  *    terminated and completed (back to the host, if started there).
 707  * @isci_host: This parameter specifies SCU.
 708  * @idev: This parameter specifies the target.
 709  *
 710  */
 711 void isci_terminate_pending_requests(struct isci_host *ihost,
 712                                      struct isci_remote_device *idev)
 713 {
 714         struct completion request_completion;
 715         enum isci_request_status old_state;
 716         unsigned long flags;
 717         LIST_HEAD(list);
 718
 719         isci_remote_device_suspend(ihost, idev);
 720
 721         spin_lock_irqsave(&ihost->scic_lock, flags);
 722         list_splice_init(&idev->reqs_in_process, &list);
 723
 724         /* assumes that isci_terminate_request_core deletes from the list */
 725         while (!list_empty(&list)) {
 726                 struct isci_request *ireq = list_entry(list.next, typeof(*ireq), dev_node);
 727
 728                 /* Change state to "terminating" if it is currently
 729                  * "started".
 730                  */
 731                 old_state = isci_request_change_started_to_newstate(ireq,
 732                                                                     &request_completion,
 733                                                                     terminating);
 734                 switch (old_state) {
 735                 case started:
 736                 case completed:
 737                 case aborting:
 738                         break;
 739                 default:
 740                         /* termination in progress, or otherwise dispositioned.
 741                          * We know the request was on 'list' so should be safe
 742                          * to move it back to reqs_in_process
 743                          */
 744                         list_move(&ireq->dev_node, &idev->reqs_in_process);
 745                         ireq = NULL;
 746                         break;
 747                 }
 748
 749                 if (!ireq)
 750                         continue;
 751                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 752
 753                 init_completion(&request_completion);
 754
 755                 dev_dbg(&ihost->pdev->dev,
 756                          "%s: idev=%p request=%p; task=%p old_state=%d\n",
 757                          __func__, idev, ireq,
 758                         (!test_bit(IREQ_TMF, &ireq->flags)
 759                                 ? isci_request_access_task(ireq)
 760                                 : NULL),
 761                         old_state);
 762
 763                 /* If the old_state is started:
 764                  * This request was not already being aborted. If it had been,
 765                  * then the aborting I/O (ie. the TMF request) would not be in
 766                  * the aborting state, and thus would be terminated here.  Note
 767                  * that since the TMF completion's call to the kernel function
 768                  * "complete()" does not happen until the pending I/O request
 769                  * terminate fully completes, we do not have to implement a
 770                  * special wait here for already aborting requests - the
 771                  * termination of the TMF request will force the request
 772                  * to finish it's already started terminate.
 773                  *
 774                  * If old_state == completed:
 775                  * This request completed from the SCU hardware perspective
 776                  * and now just needs cleaning up in terms of freeing the
 777                  * request and potentially calling up to libsas.
 778                  *
 779                  * If old_state == aborting:
 780                  * This request has already gone through a TMF timeout, but may
 781                  * not have been terminated; needs cleaning up at least.
 782                  */
 783                 isci_terminate_request_core(ihost, idev, ireq);
 784                 spin_lock_irqsave(&ihost->scic_lock, flags);
 785         }
 786         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 787 }
 788
 789 /**
 790  * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain
 791  *    Template functions.
 792  * @lun: This parameter specifies the lun to be reset.
 793  *
 794  * status, zero indicates success.
 795  */
 796 static int isci_task_send_lu_reset_sas(
 797         struct isci_host *isci_host,
 798         struct isci_remote_device *isci_device,
 799         u8 *lun)
 800 {
 801         struct isci_tmf tmf;
 802         int ret = TMF_RESP_FUNC_FAILED;
 803
 804         dev_dbg(&isci_host->pdev->dev,
 805                 "%s: isci_host = %p, isci_device = %p\n",
 806                 __func__, isci_host, isci_device);
 807         /* Send the LUN reset to the target.  By the time the call returns,
 808          * the TMF has fully exected in the target (in which case the return
 809          * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
 810          * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
 811          */
 812         isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset, NULL, NULL);
 813
 814         #define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
 815         ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
 816
 817         if (ret == TMF_RESP_FUNC_COMPLETE)
 818                 dev_dbg(&isci_host->pdev->dev,
 819                         "%s: %p: TMF_LU_RESET passed\n",
 820                         __func__, isci_device);
 821         else
 822                 dev_dbg(&isci_host->pdev->dev,
 823                         "%s: %p: TMF_LU_RESET failed (%x)\n",
 824                         __func__, isci_device, ret);
 825
 826         return ret;
 827 }
 828
 829 int isci_task_lu_reset(struct domain_device *dev, u8 *lun)
 830 {
 831         struct isci_host *ihost = dev_to_ihost(dev);
 832         struct isci_remote_device *isci_device;
 833         unsigned long flags;
 834         int ret;
 835
 836         spin_lock_irqsave(&ihost->scic_lock, flags);
 837         isci_device = isci_lookup_device(dev);
 838         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 839
 840         dev_dbg(&ihost->pdev->dev,
 841                 "%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
 842                 __func__, dev, ihost, isci_device);
 843
 844         if (!isci_device) {
 845                 /* If the device is gone, stop the escalations. */
 846                 dev_dbg(&ihost->pdev->dev, "%s: No dev\n", __func__);
 847
 848                 ret = TMF_RESP_FUNC_COMPLETE;
 849                 goto out;
 850         }
 851         if (isci_remote_device_suspend(ihost, isci_device) != SCI_SUCCESS) {
 852                 dev_dbg(&ihost->pdev->dev,
 853                         "%s:  device = %p; failed to suspend\n",
 854                         __func__, isci_device);
 855                 ret = TMF_RESP_FUNC_FAILED;
 856                 goto out;
 857         }
 858
 859         /* Send the task management part of the reset. */
 860         if (dev_is_sata(dev)) {
 861                 sas_ata_schedule_reset(dev);
 862                 ret = TMF_RESP_FUNC_COMPLETE;
 863         } else
 864                 ret = isci_task_send_lu_reset_sas(ihost, isci_device, lun);
 865
 866         /* If the LUN reset worked, all the I/O can now be terminated. */
 867         if (ret == TMF_RESP_FUNC_COMPLETE) {
 868                 /* Terminate all I/O now. */
 869                 isci_terminate_pending_requests(ihost, isci_device);
 870                 isci_remote_device_resume(ihost, isci_device, NULL, NULL);
 871         }
 872  out:
 873         isci_put_device(isci_device);
 874         return ret;
 875 }
 876
 877
 878 /*       int (*lldd_clear_nexus_port)(struct asd_sas_port *); */
 879 int isci_task_clear_nexus_port(struct asd_sas_port *port)
 880 {
 881         return TMF_RESP_FUNC_FAILED;
 882 }
 883
 884
 885
 886 int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
 887 {
 888         return TMF_RESP_FUNC_FAILED;
 889 }
 890
 891 /* Task Management Functions. Must be called from process context.       */
 892
 893 /**
 894  * isci_abort_task_process_cb() - This is a helper function for the abort task
 895  *    TMF command.  It manages the request state with respect to the successful
 896  *    transmission / completion of the abort task request.
 897  * @cb_state: This parameter specifies when this function was called - after
 898  *    the TMF request has been started and after it has timed-out.
 899  * @tmf: This parameter specifies the TMF in progress.
 900  *
 901  *
 902  */
 903 static void isci_abort_task_process_cb(
 904         enum isci_tmf_cb_state cb_state,
 905         struct isci_tmf *tmf,
 906         void *cb_data)
 907 {
 908         struct isci_request *old_request;
 909
 910         old_request = (struct isci_request *)cb_data;
 911
 912         dev_dbg(&old_request->isci_host->pdev->dev,
 913                 "%s: tmf=%p, old_request=%p\n",
 914                 __func__, tmf, old_request);
 915
 916         switch (cb_state) {
 917
 918         case isci_tmf_started:
 919                 /* The TMF has been started.  Nothing to do here, since the
 920                  * request state was already set to "aborted" by the abort
 921                  * task function.
 922                  */
 923                 if ((old_request->status != aborted)
 924                         && (old_request->status != completed))
 925                         dev_dbg(&old_request->isci_host->pdev->dev,
 926                                 "%s: Bad request status (%d): tmf=%p, old_request=%p\n",
 927                                 __func__, old_request->status, tmf, old_request);
 928                 break;
 929
 930         case isci_tmf_timed_out:
 931
 932                 /* Set the task's state to "aborting", since the abort task
 933                  * function thread set it to "aborted" (above) in anticipation
 934                  * of the task management request working correctly.  Since the
 935                  * timeout has now fired, the TMF request failed.  We set the
 936                  * state such that the request completion will indicate the
 937                  * device is no longer present.
 938                  */
 939                 isci_request_change_state(old_request, aborting);
 940                 break;
 941
 942         default:
 943                 dev_dbg(&old_request->isci_host->pdev->dev,
 944                         "%s: Bad cb_state (%d): tmf=%p, old_request=%p\n",
 945                         __func__, cb_state, tmf, old_request);
 946                 break;
 947         }
 948 }
 949
 950 /**
 951  * isci_task_abort_task() - This function is one of the SAS Domain Template
 952  *    functions. This function is called by libsas to abort a specified task.
 953  * @task: This parameter specifies the SAS task to abort.
 954  *
 955  * status, zero indicates success.
 956  */
 957 int isci_task_abort_task(struct sas_task *task)
 958 {
 959         struct isci_host *isci_host = dev_to_ihost(task->dev);
 960         DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
 961         struct isci_request       *old_request = NULL;
 962         enum isci_request_status  old_state;
 963         struct isci_remote_device *isci_device = NULL;
 964         struct isci_tmf           tmf;
 965         int                       ret = TMF_RESP_FUNC_FAILED;
 966         unsigned long             flags;
 967         int                       perform_termination = 0;
 968
 969         /* Get the isci_request reference from the task.  Note that
 970          * this check does not depend on the pending request list
 971          * in the device, because tasks driving resets may land here
 972          * after completion in the core.
 973          */
 974         spin_lock_irqsave(&isci_host->scic_lock, flags);
 975         spin_lock(&task->task_state_lock);
 976
 977         old_request = task->lldd_task;
 978
 979         /* If task is already done, the request isn't valid */
 980         if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
 981             (task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
 982             old_request)
 983                 isci_device = isci_lookup_device(task->dev);
 984
 985         spin_unlock(&task->task_state_lock);
 986         spin_unlock_irqrestore(&isci_host->scic_lock, flags);
 987
 988         dev_warn(&isci_host->pdev->dev,
 989                 "%s: dev = %p, task = %p, old_request == %p\n",
 990                 __func__, isci_device, task, old_request);
 991
 992         /* Device reset conditions signalled in task_state_flags are the
 993          * responsbility of libsas to observe at the start of the error
 994          * handler thread.
 995          */
 996         if (!isci_device || !old_request) {
 997                 /* The request has already completed and there
 998                 * is nothing to do here other than to set the task
 999                 * done bit, and indicate that the task abort function
1000                 * was sucessful.
1001                 */
1002                 spin_lock_irqsave(&task->task_state_lock, flags);
1003                 task->task_state_flags |= SAS_TASK_STATE_DONE;
1004                 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
1005                                             SAS_TASK_STATE_PENDING);
1006                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1007
1008                 ret = TMF_RESP_FUNC_COMPLETE;
1009
1010                 dev_warn(&isci_host->pdev->dev,
1011                         "%s: abort task not needed for %p\n",
1012                         __func__, task);
1013                 goto out;
1014         }
1015
1016         spin_lock_irqsave(&isci_host->scic_lock, flags);
1017
1018         /* Check the request status and change to "aborted" if currently
1019          * "starting"; if true then set the I/O kernel completion
1020          * struct that will be triggered when the request completes.
1021          */
1022         old_state = isci_task_validate_request_to_abort(
1023                                 old_request, isci_host, isci_device,
1024                                 &aborted_io_completion);
1025         if ((old_state != started) &&
1026             (old_state != completed) &&
1027             (old_state != aborting)) {
1028
1029                 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1030
1031                 /* The request was already being handled by someone else (because
1032                 * they got to set the state away from started).
1033                 */
1034                 dev_warn(&isci_host->pdev->dev,
1035                         "%s:  device = %p; old_request %p already being aborted\n",
1036                         __func__,
1037                         isci_device, old_request);
1038                 ret = TMF_RESP_FUNC_COMPLETE;
1039                 goto out;
1040         }
1041         if (task->task_proto == SAS_PROTOCOL_SMP ||
1042             sas_protocol_ata(task->task_proto) ||
1043             test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
1044
1045                 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1046
1047                 dev_warn(&isci_host->pdev->dev,
1048                         "%s: %s request"
1049                         " or complete_in_target (%d), thus no TMF\n",
1050                         __func__,
1051                         ((task->task_proto == SAS_PROTOCOL_SMP)
1052                                 ? "SMP"
1053                                 : (sas_protocol_ata(task->task_proto)
1054                                         ? "SATA/STP"
1055                                         : "<other>")
1056                          ),
1057                         test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags));
1058
1059                 if (test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
1060                         spin_lock_irqsave(&task->task_state_lock, flags);
1061                         task->task_state_flags |= SAS_TASK_STATE_DONE;
1062                         task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
1063                                                     SAS_TASK_STATE_PENDING);
1064                         spin_unlock_irqrestore(&task->task_state_lock, flags);
1065                         ret = TMF_RESP_FUNC_COMPLETE;
1066                 } else {
1067                         spin_lock_irqsave(&task->task_state_lock, flags);
1068                         task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
1069                                                     SAS_TASK_STATE_PENDING);
1070                         spin_unlock_irqrestore(&task->task_state_lock, flags);
1071                 }
1072
1073                 /* STP and SMP devices are not sent a TMF, but the
1074                  * outstanding I/O request is terminated below.  This is
1075                  * because SATA/STP and SMP discovery path timeouts directly
1076                  * call the abort task interface for cleanup.
1077                  */
1078                 perform_termination = 1;
1079
1080                 if (isci_device && !test_bit(IDEV_GONE, &isci_device->flags) &&
1081                     (isci_remote_device_suspend(isci_host, isci_device)
1082                      != SCI_SUCCESS)) {
1083                         dev_warn(&isci_host->pdev->dev,
1084                                 "%s:  device = %p; failed to suspend\n",
1085                                 __func__, isci_device);
1086                         goto out;
1087                 }
1088
1089         } else {
1090                 /* Fill in the tmf stucture */
1091                 isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
1092                                                isci_abort_task_process_cb,
1093                                                old_request);
1094
1095                 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1096
1097                 if (isci_remote_device_suspend(isci_host, isci_device)
1098                     != SCI_SUCCESS) {
1099                         dev_warn(&isci_host->pdev->dev,
1100                                 "%s:  device = %p; failed to suspend\n",
1101                                 __func__, isci_device);
1102                         goto out;
1103                 }
1104
1105                 #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */
1106                 ret = isci_task_execute_tmf(isci_host, isci_device, &tmf,
1107                                             ISCI_ABORT_TASK_TIMEOUT_MS);
1108
1109                 if (ret == TMF_RESP_FUNC_COMPLETE)
1110                         perform_termination = 1;
1111                 else
1112                         dev_warn(&isci_host->pdev->dev,
1113                                 "%s: isci_task_send_tmf failed\n", __func__);
1114         }
1115         if (perform_termination) {
1116                 set_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags);
1117
1118                 /* Clean up the request on our side, and wait for the aborted
1119                  * I/O to complete.
1120                  */
1121                 isci_terminate_request_core(isci_host, isci_device,
1122                                             old_request);
1123                 isci_remote_device_resume(isci_host, isci_device, NULL, NULL);
1124         }
1125
1126         /* Make sure we do not leave a reference to aborted_io_completion */
1127         old_request->io_request_completion = NULL;
1128  out:
1129         isci_put_device(isci_device);
1130         return ret;
1131 }
1132
1133 /**
1134  * isci_task_abort_task_set() - This function is one of the SAS Domain Template
1135  *    functions. This is one of the Task Management functoins called by libsas,
1136  *    to abort all task for the given lun.
1137  * @d_device: This parameter specifies the domain device associated with this
1138  *    request.
1139  * @lun: This parameter specifies the lun associated with this request.
1140  *
1141  * status, zero indicates success.
1142  */
1143 int isci_task_abort_task_set(
1144         struct domain_device *d_device,
1145         u8 *lun)
1146 {
1147         return TMF_RESP_FUNC_FAILED;
1148 }
1149
1150
1151 /**
1152  * isci_task_clear_aca() - This function is one of the SAS Domain Template
1153  *    functions. This is one of the Task Management functoins called by libsas.
1154  * @d_device: This parameter specifies the domain device associated with this
1155  *    request.
1156  * @lun: This parameter specifies the lun        associated with this request.
1157  *
1158  * status, zero indicates success.
1159  */
1160 int isci_task_clear_aca(
1161         struct domain_device *d_device,
1162         u8 *lun)
1163 {
1164         return TMF_RESP_FUNC_FAILED;
1165 }
1166
1167
1168
1169 /**
1170  * isci_task_clear_task_set() - This function is one of the SAS Domain Template
1171  *    functions. This is one of the Task Management functoins called by libsas.
1172  * @d_device: This parameter specifies the domain device associated with this
1173  *    request.
1174  * @lun: This parameter specifies the lun        associated with this request.
1175  *
1176  * status, zero indicates success.
1177  */
1178 int isci_task_clear_task_set(
1179         struct domain_device *d_device,
1180         u8 *lun)
1181 {
1182         return TMF_RESP_FUNC_FAILED;
1183 }
1184
1185
1186 /**
1187  * isci_task_query_task() - This function is implemented to cause libsas to
1188  *    correctly escalate the failed abort to a LUN or target reset (this is
1189  *    because sas_scsi_find_task libsas function does not correctly interpret
1190  *    all return codes from the abort task call).  When TMF_RESP_FUNC_SUCC is
1191  *    returned, libsas turns this into a LUN reset; when FUNC_FAILED is
1192  *    returned, libsas will turn this into a target reset
1193  * @task: This parameter specifies the sas task being queried.
1194  * @lun: This parameter specifies the lun associated with this request.
1195  *
1196  * status, zero indicates success.
1197  */
1198 int isci_task_query_task(
1199         struct sas_task *task)
1200 {
1201         /* See if there is a pending device reset for this device. */
1202         if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
1203                 return TMF_RESP_FUNC_FAILED;
1204         else
1205                 return TMF_RESP_FUNC_SUCC;
1206 }
1207
1208 /*
1209  * isci_task_request_complete() - This function is called by the sci core when
1210  *    an task request completes.
1211  * @ihost: This parameter specifies the ISCI host object
1212  * @ireq: This parameter is the completed isci_request object.
1213  * @completion_status: This parameter specifies the completion status from the
1214  *    sci core.
1215  *
1216  * none.
1217  */
1218 void
1219 isci_task_request_complete(struct isci_host *ihost,
1220                            struct isci_request *ireq,
1221                            enum sci_task_status completion_status)
1222 {
1223         struct isci_tmf *tmf = isci_request_access_tmf(ireq);
1224         struct completion *tmf_complete = NULL;
1225         struct completion *request_complete = ireq->io_request_completion;
1226
1227         dev_dbg(&ihost->pdev->dev,
1228                 "%s: request = %p, status=%d\n",
1229                 __func__, ireq, completion_status);
1230
1231         isci_request_change_state(ireq, completed);
1232
1233         set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
1234
1235         if (tmf) {
1236                 tmf->status = completion_status;
1237
1238                 if (tmf->proto == SAS_PROTOCOL_SSP) {
1239                         memcpy(&tmf->resp.resp_iu,
1240                                &ireq->ssp.rsp,
1241                                SSP_RESP_IU_MAX_SIZE);
1242                 } else if (tmf->proto == SAS_PROTOCOL_SATA) {
1243                         memcpy(&tmf->resp.d2h_fis,
1244                                &ireq->stp.rsp,
1245                                sizeof(struct dev_to_host_fis));
1246                 }
1247                 /* PRINT_TMF( ((struct isci_tmf *)request->task)); */
1248                 tmf_complete = tmf->complete;
1249         }
1250         sci_controller_complete_io(ihost, ireq->target_device, ireq);
1251         /* set the 'terminated' flag handle to make sure it cannot be terminated
1252          *  or completed again.
1253          */
1254         set_bit(IREQ_TERMINATED, &ireq->flags);
1255
1256         /* As soon as something is in the terminate path, deallocation is
1257          * managed there.  Note that the final non-managed state of a task
1258          * request is "completed".
1259          */
1260         if ((ireq->status == completed) ||
1261             !isci_request_is_dealloc_managed(ireq->status)) {
1262                 isci_request_change_state(ireq, unallocated);
1263                 isci_free_tag(ihost, ireq->io_tag);
1264                 list_del_init(&ireq->dev_node);
1265         }
1266
1267         /* "request_complete" is set if the task was being terminated. */
1268         if (request_complete)
1269                 complete(request_complete);
1270
1271         /* The task management part completes last. */
1272         if (tmf_complete)
1273                 complete(tmf_complete);
1274 }
1275
1276 static int isci_reset_device(struct isci_host *ihost,
1277                              struct domain_device *dev,
1278                              struct isci_remote_device *idev)
1279 {
1280         int rc;
1281         enum sci_status status;
1282         struct sas_phy *phy = sas_get_local_phy(dev);
1283         struct isci_port *iport = dev->port->lldd_port;
1284
1285         dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
1286
1287         if (isci_remote_device_reset(ihost, idev) != SCI_SUCCESS) {
1288                 rc = TMF_RESP_FUNC_FAILED;
1289                 goto out;
1290         }
1291
1292         if (scsi_is_sas_phy_local(phy)) {
1293                 struct isci_phy *iphy = &ihost->phys[phy->number];
1294
1295                 rc = isci_port_perform_hard_reset(ihost, iport, iphy);
1296         } else
1297                 rc = sas_phy_reset(phy, !dev_is_sata(dev));
1298
1299         /* Terminate in-progress I/O now. */
1300         isci_remote_device_nuke_requests(ihost, idev);
1301
1302         /* Since all pending TCs have been cleaned, resume the RNC. */
1303         status = isci_remote_device_reset_complete(ihost, idev);
1304
1305         if (status != SCI_SUCCESS)
1306                 dev_dbg(&ihost->pdev->dev,
1307                          "%s: isci_remote_device_reset_complete(%p) "
1308                          "returned %d!\n", __func__, idev, status);
1309
1310         dev_dbg(&ihost->pdev->dev, "%s: idev %p complete.\n", __func__, idev);
1311  out:
1312         sas_put_local_phy(phy);
1313         return rc;
1314 }
1315
1316 int isci_task_I_T_nexus_reset(struct domain_device *dev)
1317 {
1318         struct isci_host *ihost = dev_to_ihost(dev);
1319         struct isci_remote_device *idev;
1320         unsigned long flags;
1321         int ret;
1322
1323         spin_lock_irqsave(&ihost->scic_lock, flags);
1324         idev = isci_get_device(dev);
1325         spin_unlock_irqrestore(&ihost->scic_lock, flags);
1326
1327         if (!idev) {
1328                 /* XXX: need to cleanup any ireqs targeting this
1329                  * domain_device
1330                  */
1331                 ret = TMF_RESP_FUNC_COMPLETE;
1332                 goto out;
1333         }
1334
1335         ret = isci_reset_device(ihost, dev, idev);
1336  out:
1337         isci_put_device(idev);
1338         return ret;
1339 }