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
 100                 isci_execpath_callback(ihost, task, task->task_done);
 101                 break;
 102
 103         case isci_perform_aborted_io_completion:
 104                 /*
 105                  * No notification because this request is already in the
 106                  * abort path.
 107                  */
 108                 dev_dbg(&ihost->pdev->dev,
 109                         "%s: Aborted - task = %p, response=%d, "
 110                         "status=%d\n",
 111                         __func__, task, response, status);
 112                 break;
 113
 114         case isci_perform_error_io_completion:
 115                 /* Use sas_task_abort */
 116                 dev_dbg(&ihost->pdev->dev,
 117                         "%s: Error - task = %p, response=%d, "
 118                         "status=%d\n",
 119                         __func__, task, response, status);
 120
 121                 isci_execpath_callback(ihost, task, sas_task_abort);
 122                 break;
 123
 124         default:
 125                 dev_dbg(&ihost->pdev->dev,
 126                         "%s: isci task notification default case!",
 127                         __func__);
 128                 sas_task_abort(task);
 129                 break;
 130         }
 131 }
 132
 133 #define for_each_sas_task(num, task) \
 134         for (; num > 0; num--,\
 135              task = list_entry(task->list.next, struct sas_task, list))
 136
 137
 138 static inline int isci_device_io_ready(struct isci_remote_device *idev,
 139                                        struct sas_task *task)
 140 {
 141         return idev ? test_bit(IDEV_IO_READY, &idev->flags) ||
 142                       (test_bit(IDEV_IO_NCQERROR, &idev->flags) &&
 143                        isci_task_is_ncq_recovery(task))
 144                     : 0;
 145 }
 146 /**
 147  * isci_task_execute_task() - This function is one of the SAS Domain Template
 148  *    functions. This function is called by libsas to send a task down to
 149  *    hardware.
 150  * @task: This parameter specifies the SAS task to send.
 151  * @num: This parameter specifies the number of tasks to queue.
 152  * @gfp_flags: This parameter specifies the context of this call.
 153  *
 154  * status, zero indicates success.
 155  */
 156 int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
 157 {
 158         struct isci_host *ihost = dev_to_ihost(task->dev);
 159         struct isci_remote_device *idev;
 160         unsigned long flags;
 161         bool io_ready;
 162         u16 tag;
 163
 164         dev_dbg(&ihost->pdev->dev, "%s: num=%d\n", __func__, num);
 165
 166         for_each_sas_task(num, task) {
 167                 enum sci_status status = SCI_FAILURE;
 168
 169                 spin_lock_irqsave(&ihost->scic_lock, flags);
 170                 idev = isci_lookup_device(task->dev);
 171                 io_ready = isci_device_io_ready(idev, task);
 172                 tag = isci_alloc_tag(ihost);
 173                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 174
 175                 dev_dbg(&ihost->pdev->dev,
 176                         "task: %p, num: %d dev: %p idev: %p:%#lx cmd = %p\n",
 177                         task, num, task->dev, idev, idev ? idev->flags : 0,
 178                         task->uldd_task);
 179
 180                 if (!idev) {
 181                         isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
 182                                          SAS_DEVICE_UNKNOWN);
 183                 } else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
 184                         /* Indicate QUEUE_FULL so that the scsi midlayer
 185                          * retries.
 186                           */
 187                         isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
 188                                          SAS_QUEUE_FULL);
 189                 } else {
 190                         /* There is a device and it's ready for I/O. */
 191                         spin_lock_irqsave(&task->task_state_lock, flags);
 192
 193                         if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 194                                 /* The I/O was aborted. */
 195                                 spin_unlock_irqrestore(&task->task_state_lock,
 196                                                        flags);
 197
 198                                 isci_task_refuse(ihost, task,
 199                                                  SAS_TASK_UNDELIVERED,
 200                                                  SAM_STAT_TASK_ABORTED);
 201                         } else {
 202                                 task->task_state_flags |= SAS_TASK_AT_INITIATOR;
 203                                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 204
 205                                 /* build and send the request. */
 206                                 status = isci_request_execute(ihost, idev, task, tag);
 207
 208                                 if (status != SCI_SUCCESS) {
 209
 210                                         spin_lock_irqsave(&task->task_state_lock, flags);
 211                                         /* Did not really start this command. */
 212                                         task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 213                                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 214
 215                                         if (test_bit(IDEV_GONE, &idev->flags)) {
 216
 217                                                 /* Indicate that the device
 218                                                  * is gone.
 219                                                  */
 220                                                 isci_task_refuse(ihost, task,
 221                                                         SAS_TASK_UNDELIVERED,
 222                                                         SAS_DEVICE_UNKNOWN);
 223                                         } else {
 224                                                 /* Indicate QUEUE_FULL so that
 225                                                  * the scsi midlayer retries.
 226                                                  * If the request failed for
 227                                                  * remote device reasons, it
 228                                                  * gets returned as
 229                                                  * SAS_TASK_UNDELIVERED next
 230                                                  * time through.
 231                                                  */
 232                                                 isci_task_refuse(ihost, task,
 233                                                         SAS_TASK_COMPLETE,
 234                                                         SAS_QUEUE_FULL);
 235                                         }
 236                                 }
 237                         }
 238                 }
 239                 if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
 240                         spin_lock_irqsave(&ihost->scic_lock, flags);
 241                         /* command never hit the device, so just free
 242                          * the tci and skip the sequence increment
 243                          */
 244                         isci_tci_free(ihost, ISCI_TAG_TCI(tag));
 245                         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 246                 }
 247                 isci_put_device(idev);
 248         }
 249         return 0;
 250 }
 251
 252 static enum sci_status isci_sata_management_task_request_build(struct isci_request *ireq)
 253 {
 254         struct isci_tmf *isci_tmf;
 255         enum sci_status status;
 256
 257         if (!test_bit(IREQ_TMF, &ireq->flags))
 258                 return SCI_FAILURE;
 259
 260         isci_tmf = isci_request_access_tmf(ireq);
 261
 262         switch (isci_tmf->tmf_code) {
 263
 264         case isci_tmf_sata_srst_high:
 265         case isci_tmf_sata_srst_low: {
 266                 struct host_to_dev_fis *fis = &ireq->stp.cmd;
 267
 268                 memset(fis, 0, sizeof(*fis));
 269
 270                 fis->fis_type  =  0x27;
 271                 fis->flags     &= ~0x80;
 272                 fis->flags     &= 0xF0;
 273                 if (isci_tmf->tmf_code == isci_tmf_sata_srst_high)
 274                         fis->control |= ATA_SRST;
 275                 else
 276                         fis->control &= ~ATA_SRST;
 277                 break;
 278         }
 279         /* other management commnd go here... */
 280         default:
 281                 return SCI_FAILURE;
 282         }
 283
 284         /* core builds the protocol specific request
 285          *  based on the h2d fis.
 286          */
 287         status = sci_task_request_construct_sata(ireq);
 288
 289         return status;
 290 }
 291
 292 static struct isci_request *isci_task_request_build(struct isci_host *ihost,
 293                                                     struct isci_remote_device *idev,
 294                                                     u16 tag, struct isci_tmf *isci_tmf)
 295 {
 296         enum sci_status status = SCI_FAILURE;
 297         struct isci_request *ireq = NULL;
 298         struct domain_device *dev;
 299
 300         dev_dbg(&ihost->pdev->dev,
 301                 "%s: isci_tmf = %p\n", __func__, isci_tmf);
 302
 303         dev = idev->domain_dev;
 304
 305         /* do common allocation and init of request object. */
 306         ireq = isci_tmf_request_from_tag(ihost, isci_tmf, tag);
 307         if (!ireq)
 308                 return NULL;
 309
 310         /* let the core do it's construct. */
 311         status = sci_task_request_construct(ihost, idev, tag,
 312                                              ireq);
 313
 314         if (status != SCI_SUCCESS) {
 315                 dev_warn(&ihost->pdev->dev,
 316                          "%s: sci_task_request_construct failed - "
 317                          "status = 0x%x\n",
 318                          __func__,
 319                          status);
 320                 return NULL;
 321         }
 322
 323         /* XXX convert to get this from task->tproto like other drivers */
 324         if (dev->dev_type == SAS_END_DEV) {
 325                 isci_tmf->proto = SAS_PROTOCOL_SSP;
 326                 status = sci_task_request_construct_ssp(ireq);
 327                 if (status != SCI_SUCCESS)
 328                         return NULL;
 329         }
 330
 331         if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) {
 332                 isci_tmf->proto = SAS_PROTOCOL_SATA;
 333                 status = isci_sata_management_task_request_build(ireq);
 334
 335                 if (status != SCI_SUCCESS)
 336                         return NULL;
 337         }
 338         return ireq;
 339 }
 340
 341 /**
 342 * isci_request_mark_zombie() - This function must be called with scic_lock held.
 343 */
 344 static void isci_request_mark_zombie(struct isci_host *ihost, struct isci_request *ireq)
 345 {
 346         struct completion *tmf_completion = NULL;
 347         struct completion *req_completion;
 348
 349         /* Set the request state to "dead". */
 350         ireq->status = dead;
 351
 352         req_completion = ireq->io_request_completion;
 353         ireq->io_request_completion = NULL;
 354
 355         if (test_bit(IREQ_TMF, &ireq->flags)) {
 356                 /* Break links with the TMF request. */
 357                 struct isci_tmf *tmf = isci_request_access_tmf(ireq);
 358
 359                 /* In the case where a task request is dying,
 360                  * the thread waiting on the complete will sit and
 361                  * timeout unless we wake it now.  Since the TMF
 362                  * has a default error status, complete it here
 363                  * to wake the waiting thread.
 364                  */
 365                 if (tmf) {
 366                         tmf_completion = tmf->complete;
 367                         tmf->complete = NULL;
 368                 }
 369                 ireq->ttype_ptr.tmf_task_ptr = NULL;
 370                 dev_dbg(&ihost->pdev->dev, "%s: tmf_code %d, managed tag %#x\n",
 371                         __func__, tmf->tmf_code, tmf->io_tag);
 372         } else {
 373                 /* Break links with the sas_task - the callback is done
 374                  * elsewhere.
 375                  */
 376                 struct sas_task *task = isci_request_access_task(ireq);
 377
 378                 if (task)
 379                         task->lldd_task = NULL;
 380
 381                 ireq->ttype_ptr.io_task_ptr = NULL;
 382         }
 383
 384         dev_warn(&ihost->pdev->dev, "task context unrecoverable (tag: %#x)\n",
 385                  ireq->io_tag);
 386
 387         /* Don't force waiting threads to timeout. */
 388         if (req_completion)
 389                 complete(req_completion);
 390
 391         if (tmf_completion != NULL)
 392                 complete(tmf_completion);
 393 }
 394
 395 static int isci_task_execute_tmf(struct isci_host *ihost,
 396                                  struct isci_remote_device *idev,
 397                                  struct isci_tmf *tmf, unsigned long timeout_ms)
 398 {
 399         DECLARE_COMPLETION_ONSTACK(completion);
 400         enum sci_task_status status = SCI_TASK_FAILURE;
 401         struct isci_request *ireq;
 402         int ret = TMF_RESP_FUNC_FAILED;
 403         unsigned long flags;
 404         unsigned long timeleft;
 405         u16 tag;
 406
 407         spin_lock_irqsave(&ihost->scic_lock, flags);
 408         tag = isci_alloc_tag(ihost);
 409         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 410
 411         if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
 412                 return ret;
 413
 414         /* sanity check, return TMF_RESP_FUNC_FAILED
 415          * if the device is not there and ready.
 416          */
 417         if (!idev ||
 418             (!test_bit(IDEV_IO_READY, &idev->flags) &&
 419              !test_bit(IDEV_IO_NCQERROR, &idev->flags))) {
 420                 dev_dbg(&ihost->pdev->dev,
 421                         "%s: idev = %p not ready (%#lx)\n",
 422                         __func__,
 423                         idev, idev ? idev->flags : 0);
 424                 goto err_tci;
 425         } else
 426                 dev_dbg(&ihost->pdev->dev,
 427                         "%s: idev = %p\n",
 428                         __func__, idev);
 429
 430         /* Assign the pointer to the TMF's completion kernel wait structure. */
 431         tmf->complete = &completion;
 432         tmf->status = SCI_FAILURE_TIMEOUT;
 433
 434         ireq = isci_task_request_build(ihost, idev, tag, tmf);
 435         if (!ireq)
 436                 goto err_tci;
 437
 438         spin_lock_irqsave(&ihost->scic_lock, flags);
 439
 440         /* start the TMF io. */
 441         status = sci_controller_start_task(ihost, idev, ireq);
 442
 443         if (status != SCI_TASK_SUCCESS) {
 444                 dev_dbg(&ihost->pdev->dev,
 445                          "%s: start_io failed - status = 0x%x, request = %p\n",
 446                          __func__,
 447                          status,
 448                          ireq);
 449                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 450                 goto err_tci;
 451         }
 452
 453         if (tmf->cb_state_func != NULL)
 454                 tmf->cb_state_func(isci_tmf_started, tmf, tmf->cb_data);
 455
 456         isci_request_change_state(ireq, started);
 457
 458         /* add the request to the remote device request list. */
 459         list_add(&ireq->dev_node, &idev->reqs_in_process);
 460
 461         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 462
 463         /* Wait for the TMF to complete, or a timeout. */
 464         timeleft = wait_for_completion_timeout(&completion,
 465                                                msecs_to_jiffies(timeout_ms));
 466
 467         if (timeleft == 0) {
 468                 /* The TMF did not complete - this could be because
 469                  * of an unplug.  Terminate the TMF request now.
 470                  */
 471                 spin_lock_irqsave(&ihost->scic_lock, flags);
 472
 473                 if (tmf->cb_state_func != NULL)
 474                         tmf->cb_state_func(isci_tmf_timed_out, tmf,
 475                                            tmf->cb_data);
 476
 477                 sci_controller_terminate_request(ihost, idev, ireq);
 478
 479                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 480
 481                 timeleft = wait_for_completion_timeout(
 482                         &completion,
 483                         msecs_to_jiffies(ISCI_TERMINATION_TIMEOUT_MSEC));
 484
 485                 if (!timeleft) {
 486                         /* Strange condition - the termination of the TMF
 487                          * request timed-out.
 488                          */
 489                         spin_lock_irqsave(&ihost->scic_lock, flags);
 490
 491                         /* If the TMF status has not changed, kill it. */
 492                         if (tmf->status == SCI_FAILURE_TIMEOUT)
 493                                 isci_request_mark_zombie(ihost, ireq);
 494
 495                         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 496                 }
 497         }
 498
 499         isci_print_tmf(tmf);
 500
 501         if (tmf->status == SCI_SUCCESS)
 502                 ret =  TMF_RESP_FUNC_COMPLETE;
 503         else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
 504                 dev_dbg(&ihost->pdev->dev,
 505                         "%s: tmf.status == "
 506                         "SCI_FAILURE_IO_RESPONSE_VALID\n",
 507                         __func__);
 508                 ret =  TMF_RESP_FUNC_COMPLETE;
 509         }
 510         /* Else - leave the default "failed" status alone. */
 511
 512         dev_dbg(&ihost->pdev->dev,
 513                 "%s: completed request = %p\n",
 514                 __func__,
 515                 ireq);
 516
 517         return ret;
 518
 519  err_tci:
 520         spin_lock_irqsave(&ihost->scic_lock, flags);
 521         isci_tci_free(ihost, ISCI_TAG_TCI(tag));
 522         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 523
 524         return ret;
 525 }
 526
 527 static void isci_task_build_tmf(struct isci_tmf *tmf,
 528                                 enum isci_tmf_function_codes code,
 529                                 void (*tmf_sent_cb)(enum isci_tmf_cb_state,
 530                                                     struct isci_tmf *,
 531                                                     void *),
 532                                 void *cb_data)
 533 {
 534         memset(tmf, 0, sizeof(*tmf));
 535
 536         tmf->tmf_code      = code;
 537         tmf->cb_state_func = tmf_sent_cb;
 538         tmf->cb_data       = cb_data;
 539 }
 540
 541 static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf,
 542                                            enum isci_tmf_function_codes code,
 543                                            void (*tmf_sent_cb)(enum isci_tmf_cb_state,
 544                                                                struct isci_tmf *,
 545                                                                void *),
 546                                            struct isci_request *old_request)
 547 {
 548         isci_task_build_tmf(tmf, code, tmf_sent_cb, old_request);
 549         tmf->io_tag = old_request->io_tag;
 550 }
 551
 552 /**
 553  * isci_task_validate_request_to_abort() - This function checks the given I/O
 554  *    against the "started" state.  If the request is still "started", it's
 555  *    state is changed to aborted. NOTE: isci_host->scic_lock MUST BE HELD
 556  *    BEFORE CALLING THIS FUNCTION.
 557  * @isci_request: This parameter specifies the request object to control.
 558  * @isci_host: This parameter specifies the ISCI host object
 559  * @isci_device: This is the device to which the request is pending.
 560  * @aborted_io_completion: This is a completion structure that will be added to
 561  *    the request in case it is changed to aborting; this completion is
 562  *    triggered when the request is fully completed.
 563  *
 564  * Either "started" on successful change of the task status to "aborted", or
 565  * "unallocated" if the task cannot be controlled.
 566  */
 567 static enum isci_request_status isci_task_validate_request_to_abort(
 568         struct isci_request *isci_request,
 569         struct isci_host *isci_host,
 570         struct isci_remote_device *isci_device,
 571         struct completion *aborted_io_completion)
 572 {
 573         enum isci_request_status old_state = unallocated;
 574
 575         /* Only abort the task if it's in the
 576          *  device's request_in_process list
 577          */
 578         if (isci_request && !list_empty(&isci_request->dev_node)) {
 579                 old_state = isci_request_change_started_to_aborted(
 580                         isci_request, aborted_io_completion);
 581
 582         }
 583
 584         return old_state;
 585 }
 586
 587 static int isci_request_is_dealloc_managed(enum isci_request_status stat)
 588 {
 589         switch (stat) {
 590         case aborted:
 591         case aborting:
 592         case terminating:
 593         case completed:
 594         case dead:
 595                 return true;
 596         default:
 597                 return false;
 598         }
 599 }
 600
 601 /**
 602  * isci_terminate_request_core() - This function will terminate the given
 603  *    request, and wait for it to complete.  This function must only be called
 604  *    from a thread that can wait.  Note that the request is terminated and
 605  *    completed (back to the host, if started there).
 606  * @ihost: This SCU.
 607  * @idev: The target.
 608  * @isci_request: The I/O request to be terminated.
 609  *
 610  */
 611 static void isci_terminate_request_core(struct isci_host *ihost,
 612                                         struct isci_remote_device *idev,
 613                                         struct isci_request *isci_request)
 614 {
 615         enum sci_status status      = SCI_SUCCESS;
 616         bool was_terminated         = false;
 617         bool needs_cleanup_handling = false;
 618         unsigned long     flags;
 619         unsigned long     termination_completed = 1;
 620         struct completion *io_request_completion;
 621
 622         dev_dbg(&ihost->pdev->dev,
 623                 "%s: device = %p; request = %p\n",
 624                 __func__, idev, isci_request);
 625
 626         spin_lock_irqsave(&ihost->scic_lock, flags);
 627
 628         io_request_completion = isci_request->io_request_completion;
 629
 630         /* Note that we are not going to control
 631          * the target to abort the request.
 632          */
 633         set_bit(IREQ_COMPLETE_IN_TARGET, &isci_request->flags);
 634
 635         /* Make sure the request wasn't just sitting around signalling
 636          * device condition (if the request handle is NULL, then the
 637          * request completed but needed additional handling here).
 638          */
 639         if (!test_bit(IREQ_TERMINATED, &isci_request->flags)) {
 640                 was_terminated = true;
 641                 needs_cleanup_handling = true;
 642                 status = sci_controller_terminate_request(ihost,
 643                                                            idev,
 644                                                            isci_request);
 645         }
 646         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 647
 648         /*
 649          * The only time the request to terminate will
 650          * fail is when the io request is completed and
 651          * being aborted.
 652          */
 653         if (status != SCI_SUCCESS) {
 654                 dev_dbg(&ihost->pdev->dev,
 655                         "%s: sci_controller_terminate_request"
 656                         " returned = 0x%x\n",
 657                         __func__, status);
 658
 659                 isci_request->io_request_completion = NULL;
 660
 661         } else {
 662                 if (was_terminated) {
 663                         dev_dbg(&ihost->pdev->dev,
 664                                 "%s: before completion wait (%p/%p)\n",
 665                                 __func__, isci_request, io_request_completion);
 666
 667                         /* Wait here for the request to complete. */
 668                         termination_completed
 669                                 = wait_for_completion_timeout(
 670                                    io_request_completion,
 671                                    msecs_to_jiffies(ISCI_TERMINATION_TIMEOUT_MSEC));
 672
 673                         if (!termination_completed) {
 674
 675                                 /* The request to terminate has timed out.  */
 676                                 spin_lock_irqsave(&ihost->scic_lock, flags);
 677
 678                                 /* Check for state changes. */
 679                                 if (!test_bit(IREQ_TERMINATED,
 680                                               &isci_request->flags)) {
 681
 682                                         /* The best we can do is to have the
 683                                          * request die a silent death if it
 684                                          * ever really completes.
 685                                          */
 686                                         isci_request_mark_zombie(ihost,
 687                                                                  isci_request);
 688                                         needs_cleanup_handling = true;
 689                                 } else
 690                                         termination_completed = 1;
 691
 692                                 spin_unlock_irqrestore(&ihost->scic_lock,
 693                                                        flags);
 694
 695                                 if (!termination_completed) {
 696
 697                                         dev_dbg(&ihost->pdev->dev,
 698                                                 "%s: *** Timeout waiting for "
 699                                                 "termination(%p/%p)\n",
 700                                                 __func__, io_request_completion,
 701                                                 isci_request);
 702
 703                                         /* The request can no longer be referenced
 704                                          * safely since it may go away if the
 705                                          * termination every really does complete.
 706                                          */
 707                                         isci_request = NULL;
 708                                 }
 709                         }
 710                         if (termination_completed)
 711                                 dev_dbg(&ihost->pdev->dev,
 712                                         "%s: after completion wait (%p/%p)\n",
 713                                         __func__, isci_request, io_request_completion);
 714                 }
 715
 716                 if (termination_completed) {
 717
 718                         isci_request->io_request_completion = NULL;
 719
 720                         /* Peek at the status of the request.  This will tell
 721                          * us if there was special handling on the request such that it
 722                          * needs to be detached and freed here.
 723                          */
 724                         spin_lock_irqsave(&isci_request->state_lock, flags);
 725
 726                         needs_cleanup_handling
 727                                 = isci_request_is_dealloc_managed(
 728                                         isci_request->status);
 729
 730                         spin_unlock_irqrestore(&isci_request->state_lock, flags);
 731
 732                 }
 733                 if (needs_cleanup_handling) {
 734
 735                         dev_dbg(&ihost->pdev->dev,
 736                                 "%s: cleanup isci_device=%p, request=%p\n",
 737                                 __func__, idev, isci_request);
 738
 739                         if (isci_request != NULL) {
 740                                 spin_lock_irqsave(&ihost->scic_lock, flags);
 741                                 isci_free_tag(ihost, isci_request->io_tag);
 742                                 isci_request_change_state(isci_request, unallocated);
 743                                 list_del_init(&isci_request->dev_node);
 744                                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 745                         }
 746                 }
 747         }
 748 }
 749
 750 /**
 751  * isci_terminate_pending_requests() - This function will change the all of the
 752  *    requests on the given device's state to "aborting", will terminate the
 753  *    requests, and wait for them to complete.  This function must only be
 754  *    called from a thread that can wait.  Note that the requests are all
 755  *    terminated and completed (back to the host, if started there).
 756  * @isci_host: This parameter specifies SCU.
 757  * @idev: This parameter specifies the target.
 758  *
 759  */
 760 void isci_terminate_pending_requests(struct isci_host *ihost,
 761                                      struct isci_remote_device *idev)
 762 {
 763         struct completion request_completion;
 764         enum isci_request_status old_state;
 765         unsigned long flags;
 766         LIST_HEAD(list);
 767
 768         spin_lock_irqsave(&ihost->scic_lock, flags);
 769         list_splice_init(&idev->reqs_in_process, &list);
 770
 771         /* assumes that isci_terminate_request_core deletes from the list */
 772         while (!list_empty(&list)) {
 773                 struct isci_request *ireq = list_entry(list.next, typeof(*ireq), dev_node);
 774
 775                 /* Change state to "terminating" if it is currently
 776                  * "started".
 777                  */
 778                 old_state = isci_request_change_started_to_newstate(ireq,
 779                                                                     &request_completion,
 780                                                                     terminating);
 781                 switch (old_state) {
 782                 case started:
 783                 case completed:
 784                 case aborting:
 785                         break;
 786                 default:
 787                         /* termination in progress, or otherwise dispositioned.
 788                          * We know the request was on 'list' so should be safe
 789                          * to move it back to reqs_in_process
 790                          */
 791                         list_move(&ireq->dev_node, &idev->reqs_in_process);
 792                         ireq = NULL;
 793                         break;
 794                 }
 795
 796                 if (!ireq)
 797                         continue;
 798                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 799
 800                 init_completion(&request_completion);
 801
 802                 dev_dbg(&ihost->pdev->dev,
 803                          "%s: idev=%p request=%p; task=%p old_state=%d\n",
 804                          __func__, idev, ireq,
 805                         (!test_bit(IREQ_TMF, &ireq->flags)
 806                                 ? isci_request_access_task(ireq)
 807                                 : NULL),
 808                         old_state);
 809
 810                 /* If the old_state is started:
 811                  * This request was not already being aborted. If it had been,
 812                  * then the aborting I/O (ie. the TMF request) would not be in
 813                  * the aborting state, and thus would be terminated here.  Note
 814                  * that since the TMF completion's call to the kernel function
 815                  * "complete()" does not happen until the pending I/O request
 816                  * terminate fully completes, we do not have to implement a
 817                  * special wait here for already aborting requests - the
 818                  * termination of the TMF request will force the request
 819                  * to finish it's already started terminate.
 820                  *
 821                  * If old_state == completed:
 822                  * This request completed from the SCU hardware perspective
 823                  * and now just needs cleaning up in terms of freeing the
 824                  * request and potentially calling up to libsas.
 825                  *
 826                  * If old_state == aborting:
 827                  * This request has already gone through a TMF timeout, but may
 828                  * not have been terminated; needs cleaning up at least.
 829                  */
 830                 isci_terminate_request_core(ihost, idev, ireq);
 831                 spin_lock_irqsave(&ihost->scic_lock, flags);
 832         }
 833         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 834 }
 835
 836 /**
 837  * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain
 838  *    Template functions.
 839  * @lun: This parameter specifies the lun to be reset.
 840  *
 841  * status, zero indicates success.
 842  */
 843 static int isci_task_send_lu_reset_sas(
 844         struct isci_host *isci_host,
 845         struct isci_remote_device *isci_device,
 846         u8 *lun)
 847 {
 848         struct isci_tmf tmf;
 849         int ret = TMF_RESP_FUNC_FAILED;
 850
 851         dev_dbg(&isci_host->pdev->dev,
 852                 "%s: isci_host = %p, isci_device = %p\n",
 853                 __func__, isci_host, isci_device);
 854         /* Send the LUN reset to the target.  By the time the call returns,
 855          * the TMF has fully exected in the target (in which case the return
 856          * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
 857          * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
 858          */
 859         isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset, NULL, NULL);
 860
 861         #define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
 862         ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
 863
 864         if (ret == TMF_RESP_FUNC_COMPLETE)
 865                 dev_dbg(&isci_host->pdev->dev,
 866                         "%s: %p: TMF_LU_RESET passed\n",
 867                         __func__, isci_device);
 868         else
 869                 dev_dbg(&isci_host->pdev->dev,
 870                         "%s: %p: TMF_LU_RESET failed (%x)\n",
 871                         __func__, isci_device, ret);
 872
 873         return ret;
 874 }
 875
 876 static int isci_task_send_lu_reset_sata(struct isci_host *ihost,
 877                                  struct isci_remote_device *idev, u8 *lun)
 878 {
 879         int ret = TMF_RESP_FUNC_FAILED;
 880         struct isci_tmf tmf;
 881
 882         /* Send the soft reset to the target */
 883         #define ISCI_SRST_TIMEOUT_MS 25000 /* 25 second timeout. */
 884         isci_task_build_tmf(&tmf, isci_tmf_sata_srst_high, NULL, NULL);
 885
 886         ret = isci_task_execute_tmf(ihost, idev, &tmf, ISCI_SRST_TIMEOUT_MS);
 887
 888         if (ret != TMF_RESP_FUNC_COMPLETE) {
 889                 dev_dbg(&ihost->pdev->dev,
 890                          "%s: Assert SRST failed (%p) = %x",
 891                          __func__, idev, ret);
 892
 893                 /* Return the failure so that the LUN reset is escalated
 894                  * to a target reset.
 895                  */
 896         }
 897         return ret;
 898 }
 899
 900 /**
 901  * isci_task_lu_reset() - This function is one of the SAS Domain Template
 902  *    functions. This is one of the Task Management functoins called by libsas,
 903  *    to reset the given lun. Note the assumption that while this call is
 904  *    executing, no I/O will be sent by the host to the device.
 905  * @lun: This parameter specifies the lun to be reset.
 906  *
 907  * status, zero indicates success.
 908  */
 909 int isci_task_lu_reset(struct domain_device *domain_device, u8 *lun)
 910 {
 911         struct isci_host *isci_host = dev_to_ihost(domain_device);
 912         struct isci_remote_device *isci_device;
 913         unsigned long flags;
 914         int ret;
 915
 916         spin_lock_irqsave(&isci_host->scic_lock, flags);
 917         isci_device = isci_lookup_device(domain_device);
 918         spin_unlock_irqrestore(&isci_host->scic_lock, flags);
 919
 920         dev_dbg(&isci_host->pdev->dev,
 921                 "%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
 922                  __func__, domain_device, isci_host, isci_device);
 923
 924         if (!isci_device) {
 925                 /* If the device is gone, stop the escalations. */
 926                 dev_dbg(&isci_host->pdev->dev, "%s: No dev\n", __func__);
 927
 928                 ret = TMF_RESP_FUNC_COMPLETE;
 929                 goto out;
 930         }
 931         set_bit(IDEV_EH, &isci_device->flags);
 932
 933         /* Send the task management part of the reset. */
 934         if (sas_protocol_ata(domain_device->tproto)) {
 935                 ret = isci_task_send_lu_reset_sata(isci_host, isci_device, lun);
 936         } else
 937                 ret = isci_task_send_lu_reset_sas(isci_host, isci_device, lun);
 938
 939         /* If the LUN reset worked, all the I/O can now be terminated. */
 940         if (ret == TMF_RESP_FUNC_COMPLETE)
 941                 /* Terminate all I/O now. */
 942                 isci_terminate_pending_requests(isci_host,
 943                                                 isci_device);
 944
 945  out:
 946         isci_put_device(isci_device);
 947         return ret;
 948 }
 949
 950
 951 /*       int (*lldd_clear_nexus_port)(struct asd_sas_port *); */
 952 int isci_task_clear_nexus_port(struct asd_sas_port *port)
 953 {
 954         return TMF_RESP_FUNC_FAILED;
 955 }
 956
 957
 958
 959 int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
 960 {
 961         return TMF_RESP_FUNC_FAILED;
 962 }
 963
 964 /* Task Management Functions. Must be called from process context.       */
 965
 966 /**
 967  * isci_abort_task_process_cb() - This is a helper function for the abort task
 968  *    TMF command.  It manages the request state with respect to the successful
 969  *    transmission / completion of the abort task request.
 970  * @cb_state: This parameter specifies when this function was called - after
 971  *    the TMF request has been started and after it has timed-out.
 972  * @tmf: This parameter specifies the TMF in progress.
 973  *
 974  *
 975  */
 976 static void isci_abort_task_process_cb(
 977         enum isci_tmf_cb_state cb_state,
 978         struct isci_tmf *tmf,
 979         void *cb_data)
 980 {
 981         struct isci_request *old_request;
 982
 983         old_request = (struct isci_request *)cb_data;
 984
 985         dev_dbg(&old_request->isci_host->pdev->dev,
 986                 "%s: tmf=%p, old_request=%p\n",
 987                 __func__, tmf, old_request);
 988
 989         switch (cb_state) {
 990
 991         case isci_tmf_started:
 992                 /* The TMF has been started.  Nothing to do here, since the
 993                  * request state was already set to "aborted" by the abort
 994                  * task function.
 995                  */
 996                 if ((old_request->status != aborted)
 997                         && (old_request->status != completed))
 998                         dev_dbg(&old_request->isci_host->pdev->dev,
 999                                 "%s: Bad request status (%d): tmf=%p, old_request=%p\n",
1000                                 __func__, old_request->status, tmf, old_request);
1001                 break;
1002
1003         case isci_tmf_timed_out:
1004
1005                 /* Set the task's state to "aborting", since the abort task
1006                  * function thread set it to "aborted" (above) in anticipation
1007                  * of the task management request working correctly.  Since the
1008                  * timeout has now fired, the TMF request failed.  We set the
1009                  * state such that the request completion will indicate the
1010                  * device is no longer present.
1011                  */
1012                 isci_request_change_state(old_request, aborting);
1013                 break;
1014
1015         default:
1016                 dev_dbg(&old_request->isci_host->pdev->dev,
1017                         "%s: Bad cb_state (%d): tmf=%p, old_request=%p\n",
1018                         __func__, cb_state, tmf, old_request);
1019                 break;
1020         }
1021 }
1022
1023 /**
1024  * isci_task_abort_task() - This function is one of the SAS Domain Template
1025  *    functions. This function is called by libsas to abort a specified task.
1026  * @task: This parameter specifies the SAS task to abort.
1027  *
1028  * status, zero indicates success.
1029  */
1030 int isci_task_abort_task(struct sas_task *task)
1031 {
1032         struct isci_host *isci_host = dev_to_ihost(task->dev);
1033         DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
1034         struct isci_request       *old_request = NULL;
1035         enum isci_request_status  old_state;
1036         struct isci_remote_device *isci_device = NULL;
1037         struct isci_tmf           tmf;
1038         int                       ret = TMF_RESP_FUNC_FAILED;
1039         unsigned long             flags;
1040         int                       perform_termination = 0;
1041
1042         /* Get the isci_request reference from the task.  Note that
1043          * this check does not depend on the pending request list
1044          * in the device, because tasks driving resets may land here
1045          * after completion in the core.
1046          */
1047         spin_lock_irqsave(&isci_host->scic_lock, flags);
1048         spin_lock(&task->task_state_lock);
1049
1050         old_request = task->lldd_task;
1051
1052         /* If task is already done, the request isn't valid */
1053         if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
1054             (task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
1055             old_request)
1056                 isci_device = isci_lookup_device(task->dev);
1057
1058         spin_unlock(&task->task_state_lock);
1059         spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1060
1061         dev_dbg(&isci_host->pdev->dev,
1062                 "%s: dev = %p, task = %p, old_request == %p\n",
1063                 __func__, isci_device, task, old_request);
1064
1065         if (isci_device)
1066                 set_bit(IDEV_EH, &isci_device->flags);
1067
1068         /* Device reset conditions signalled in task_state_flags are the
1069          * responsbility of libsas to observe at the start of the error
1070          * handler thread.
1071          */
1072         if (!isci_device || !old_request) {
1073                 /* The request has already completed and there
1074                 * is nothing to do here other than to set the task
1075                 * done bit, and indicate that the task abort function
1076                 * was sucessful.
1077                 */
1078                 spin_lock_irqsave(&task->task_state_lock, flags);
1079                 task->task_state_flags |= SAS_TASK_STATE_DONE;
1080                 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
1081                                             SAS_TASK_STATE_PENDING);
1082                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1083
1084                 ret = TMF_RESP_FUNC_COMPLETE;
1085
1086                 dev_dbg(&isci_host->pdev->dev,
1087                         "%s: abort task not needed for %p\n",
1088                         __func__, task);
1089                 goto out;
1090         }
1091
1092         spin_lock_irqsave(&isci_host->scic_lock, flags);
1093
1094         /* Check the request status and change to "aborted" if currently
1095          * "starting"; if true then set the I/O kernel completion
1096          * struct that will be triggered when the request completes.
1097          */
1098         old_state = isci_task_validate_request_to_abort(
1099                                 old_request, isci_host, isci_device,
1100                                 &aborted_io_completion);
1101         if ((old_state != started) &&
1102             (old_state != completed) &&
1103             (old_state != aborting)) {
1104
1105                 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1106
1107                 /* The request was already being handled by someone else (because
1108                 * they got to set the state away from started).
1109                 */
1110                 dev_dbg(&isci_host->pdev->dev,
1111                         "%s:  device = %p; old_request %p already being aborted\n",
1112                         __func__,
1113                         isci_device, old_request);
1114                 ret = TMF_RESP_FUNC_COMPLETE;
1115                 goto out;
1116         }
1117         if (task->task_proto == SAS_PROTOCOL_SMP ||
1118             sas_protocol_ata(task->task_proto) ||
1119             test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
1120
1121                 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1122
1123                 dev_dbg(&isci_host->pdev->dev,
1124                         "%s: %s request"
1125                         " or complete_in_target (%d), thus no TMF\n",
1126                         __func__,
1127                         ((task->task_proto == SAS_PROTOCOL_SMP)
1128                                 ? "SMP"
1129                                 : (sas_protocol_ata(task->task_proto)
1130                                         ? "SATA/STP"
1131                                         : "<other>")
1132                          ),
1133                         test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags));
1134
1135                 if (test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) {
1136                         spin_lock_irqsave(&task->task_state_lock, flags);
1137                         task->task_state_flags |= SAS_TASK_STATE_DONE;
1138                         task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
1139                                                     SAS_TASK_STATE_PENDING);
1140                         spin_unlock_irqrestore(&task->task_state_lock, flags);
1141                         ret = TMF_RESP_FUNC_COMPLETE;
1142                 } else {
1143                         spin_lock_irqsave(&task->task_state_lock, flags);
1144                         task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
1145                                                     SAS_TASK_STATE_PENDING);
1146                         spin_unlock_irqrestore(&task->task_state_lock, flags);
1147                 }
1148
1149                 /* STP and SMP devices are not sent a TMF, but the
1150                  * outstanding I/O request is terminated below.  This is
1151                  * because SATA/STP and SMP discovery path timeouts directly
1152                  * call the abort task interface for cleanup.
1153                  */
1154                 perform_termination = 1;
1155
1156         } else {
1157                 /* Fill in the tmf stucture */
1158                 isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
1159                                                isci_abort_task_process_cb,
1160                                                old_request);
1161
1162                 spin_unlock_irqrestore(&isci_host->scic_lock, flags);
1163
1164                 #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */
1165                 ret = isci_task_execute_tmf(isci_host, isci_device, &tmf,
1166                                             ISCI_ABORT_TASK_TIMEOUT_MS);
1167
1168                 if (ret == TMF_RESP_FUNC_COMPLETE)
1169                         perform_termination = 1;
1170                 else
1171                         dev_dbg(&isci_host->pdev->dev,
1172                                 "%s: isci_task_send_tmf failed\n", __func__);
1173         }
1174         if (perform_termination) {
1175                 set_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags);
1176
1177                 /* Clean up the request on our side, and wait for the aborted
1178                  * I/O to complete.
1179                  */
1180                 isci_terminate_request_core(isci_host, isci_device,
1181                                             old_request);
1182         }
1183
1184         /* Make sure we do not leave a reference to aborted_io_completion */
1185         old_request->io_request_completion = NULL;
1186  out:
1187         isci_put_device(isci_device);
1188         return ret;
1189 }
1190
1191 /**
1192  * isci_task_abort_task_set() - This function is one of the SAS Domain Template
1193  *    functions. This is one of the Task Management functoins called by libsas,
1194  *    to abort all task for the given lun.
1195  * @d_device: This parameter specifies the domain device associated with this
1196  *    request.
1197  * @lun: This parameter specifies the lun associated with this request.
1198  *
1199  * status, zero indicates success.
1200  */
1201 int isci_task_abort_task_set(
1202         struct domain_device *d_device,
1203         u8 *lun)
1204 {
1205         return TMF_RESP_FUNC_FAILED;
1206 }
1207
1208
1209 /**
1210  * isci_task_clear_aca() - This function is one of the SAS Domain Template
1211  *    functions. This is one of the Task Management functoins called by libsas.
1212  * @d_device: This parameter specifies the domain device associated with this
1213  *    request.
1214  * @lun: This parameter specifies the lun        associated with this request.
1215  *
1216  * status, zero indicates success.
1217  */
1218 int isci_task_clear_aca(
1219         struct domain_device *d_device,
1220         u8 *lun)
1221 {
1222         return TMF_RESP_FUNC_FAILED;
1223 }
1224
1225
1226
1227 /**
1228  * isci_task_clear_task_set() - This function is one of the SAS Domain Template
1229  *    functions. This is one of the Task Management functoins called by libsas.
1230  * @d_device: This parameter specifies the domain device associated with this
1231  *    request.
1232  * @lun: This parameter specifies the lun        associated with this request.
1233  *
1234  * status, zero indicates success.
1235  */
1236 int isci_task_clear_task_set(
1237         struct domain_device *d_device,
1238         u8 *lun)
1239 {
1240         return TMF_RESP_FUNC_FAILED;
1241 }
1242
1243
1244 /**
1245  * isci_task_query_task() - This function is implemented to cause libsas to
1246  *    correctly escalate the failed abort to a LUN or target reset (this is
1247  *    because sas_scsi_find_task libsas function does not correctly interpret
1248  *    all return codes from the abort task call).  When TMF_RESP_FUNC_SUCC is
1249  *    returned, libsas turns this into a LUN reset; when FUNC_FAILED is
1250  *    returned, libsas will turn this into a target reset
1251  * @task: This parameter specifies the sas task being queried.
1252  * @lun: This parameter specifies the lun associated with this request.
1253  *
1254  * status, zero indicates success.
1255  */
1256 int isci_task_query_task(
1257         struct sas_task *task)
1258 {
1259         /* See if there is a pending device reset for this device. */
1260         if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
1261                 return TMF_RESP_FUNC_FAILED;
1262         else
1263                 return TMF_RESP_FUNC_SUCC;
1264 }
1265
1266 /*
1267  * isci_task_request_complete() - This function is called by the sci core when
1268  *    an task request completes.
1269  * @ihost: This parameter specifies the ISCI host object
1270  * @ireq: This parameter is the completed isci_request object.
1271  * @completion_status: This parameter specifies the completion status from the
1272  *    sci core.
1273  *
1274  * none.
1275  */
1276 void
1277 isci_task_request_complete(struct isci_host *ihost,
1278                            struct isci_request *ireq,
1279                            enum sci_task_status completion_status)
1280 {
1281         struct isci_tmf *tmf = isci_request_access_tmf(ireq);
1282         struct completion *tmf_complete = NULL;
1283         struct completion *request_complete = ireq->io_request_completion;
1284
1285         dev_dbg(&ihost->pdev->dev,
1286                 "%s: request = %p, status=%d\n",
1287                 __func__, ireq, completion_status);
1288
1289         isci_request_change_state(ireq, completed);
1290
1291         set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
1292
1293         if (tmf) {
1294                 tmf->status = completion_status;
1295
1296                 if (tmf->proto == SAS_PROTOCOL_SSP) {
1297                         memcpy(&tmf->resp.resp_iu,
1298                                &ireq->ssp.rsp,
1299                                SSP_RESP_IU_MAX_SIZE);
1300                 } else if (tmf->proto == SAS_PROTOCOL_SATA) {
1301                         memcpy(&tmf->resp.d2h_fis,
1302                                &ireq->stp.rsp,
1303                                sizeof(struct dev_to_host_fis));
1304                 }
1305                 /* PRINT_TMF( ((struct isci_tmf *)request->task)); */
1306                 tmf_complete = tmf->complete;
1307         }
1308         sci_controller_complete_io(ihost, ireq->target_device, ireq);
1309         /* set the 'terminated' flag handle to make sure it cannot be terminated
1310          *  or completed again.
1311          */
1312         set_bit(IREQ_TERMINATED, &ireq->flags);
1313
1314         /* As soon as something is in the terminate path, deallocation is
1315          * managed there.  Note that the final non-managed state of a task
1316          * request is "completed".
1317          */
1318         if ((ireq->status == completed) ||
1319             !isci_request_is_dealloc_managed(ireq->status)) {
1320                 isci_request_change_state(ireq, unallocated);
1321                 isci_free_tag(ihost, ireq->io_tag);
1322                 list_del_init(&ireq->dev_node);
1323         }
1324
1325         /* "request_complete" is set if the task was being terminated. */
1326         if (request_complete)
1327                 complete(request_complete);
1328
1329         /* The task management part completes last. */
1330         if (tmf_complete)
1331                 complete(tmf_complete);
1332 }
1333
1334 static int isci_reset_device(struct isci_host *ihost,
1335                              struct isci_remote_device *idev)
1336 {
1337         struct sas_phy *phy = sas_find_local_phy(idev->domain_dev);
1338         enum sci_status status;
1339         unsigned long flags;
1340         int rc;
1341
1342         dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
1343
1344         spin_lock_irqsave(&ihost->scic_lock, flags);
1345         status = sci_remote_device_reset(idev);
1346         if (status != SCI_SUCCESS) {
1347                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
1348
1349                 dev_dbg(&ihost->pdev->dev,
1350                          "%s: sci_remote_device_reset(%p) returned %d!\n",
1351                          __func__, idev, status);
1352
1353                 return TMF_RESP_FUNC_FAILED;
1354         }
1355         spin_unlock_irqrestore(&ihost->scic_lock, flags);
1356
1357         rc = sas_phy_reset(phy, true);
1358
1359         /* Terminate in-progress I/O now. */
1360         isci_remote_device_nuke_requests(ihost, idev);
1361
1362         /* Since all pending TCs have been cleaned, resume the RNC. */
1363         spin_lock_irqsave(&ihost->scic_lock, flags);
1364         status = sci_remote_device_reset_complete(idev);
1365         spin_unlock_irqrestore(&ihost->scic_lock, flags);
1366
1367         if (status != SCI_SUCCESS) {
1368                 dev_dbg(&ihost->pdev->dev,
1369                          "%s: sci_remote_device_reset_complete(%p) "
1370                          "returned %d!\n", __func__, idev, status);
1371         }
1372
1373         dev_dbg(&ihost->pdev->dev, "%s: idev %p complete.\n", __func__, idev);
1374
1375         return rc;
1376 }
1377
1378 int isci_task_I_T_nexus_reset(struct domain_device *dev)
1379 {
1380         struct isci_host *ihost = dev_to_ihost(dev);
1381         struct isci_remote_device *idev;
1382         unsigned long flags;
1383         int ret;
1384
1385         spin_lock_irqsave(&ihost->scic_lock, flags);
1386         idev = isci_lookup_device(dev);
1387         spin_unlock_irqrestore(&ihost->scic_lock, flags);
1388
1389         if (!idev || !test_bit(IDEV_EH, &idev->flags)) {
1390                 ret = TMF_RESP_FUNC_COMPLETE;
1391                 goto out;
1392         }
1393
1394         ret = isci_reset_device(ihost, idev);
1395  out:
1396         isci_put_device(idev);
1397         return ret;
1398 }
1399
1400 int isci_bus_reset_handler(struct scsi_cmnd *cmd)
1401 {
1402         struct domain_device *dev = sdev_to_domain_dev(cmd->device);
1403         struct isci_host *ihost = dev_to_ihost(dev);
1404         struct isci_remote_device *idev;
1405         unsigned long flags;
1406         int ret;
1407
1408         spin_lock_irqsave(&ihost->scic_lock, flags);
1409         idev = isci_lookup_device(dev);
1410         spin_unlock_irqrestore(&ihost->scic_lock, flags);
1411
1412         if (!idev) {
1413                 ret = TMF_RESP_FUNC_COMPLETE;
1414                 goto out;
1415         }
1416
1417         ret = isci_reset_device(ihost, idev);
1418  out:
1419         isci_put_device(idev);
1420         return ret;
1421 }