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         unsigned long flags;
  82
  83         /* Normal notification (task_done) */
  84         dev_dbg(&ihost->pdev->dev, "%s: task = %p, response=%d, status=%d\n",
  85                 __func__, task, response, status);
  86
  87         spin_lock_irqsave(&task->task_state_lock, flags);
  88
  89         task->task_status.resp = response;
  90         task->task_status.stat = status;
  91
  92         /* Normal notification (task_done) */
  93         task->task_state_flags |= SAS_TASK_STATE_DONE;
  94         task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
  95                                     SAS_TASK_STATE_PENDING);
  96         task->lldd_task = NULL;
  97         spin_unlock_irqrestore(&task->task_state_lock, flags);
  98
  99         task->task_done(task);
 100 }
 101
 102 #define for_each_sas_task(num, task) \
 103         for (; num > 0; num--,\
 104              task = list_entry(task->list.next, struct sas_task, list))
 105
 106
 107 static inline int isci_device_io_ready(struct isci_remote_device *idev,
 108                                        struct sas_task *task)
 109 {
 110         return idev ? test_bit(IDEV_IO_READY, &idev->flags) ||
 111                       (test_bit(IDEV_IO_NCQERROR, &idev->flags) &&
 112                        isci_task_is_ncq_recovery(task))
 113                     : 0;
 114 }
 115 /**
 116  * isci_task_execute_task() - This function is one of the SAS Domain Template
 117  *    functions. This function is called by libsas to send a task down to
 118  *    hardware.
 119  * @task: This parameter specifies the SAS task to send.
 120  * @gfp_flags: This parameter specifies the context of this call.
 121  *
 122  * status, zero indicates success.
 123  */
 124 int isci_task_execute_task(struct sas_task *task, gfp_t gfp_flags)
 125 {
 126         struct isci_host *ihost = dev_to_ihost(task->dev);
 127         struct isci_remote_device *idev;
 128         unsigned long flags;
 129         enum sci_status status = SCI_FAILURE;
 130         bool io_ready;
 131         u16 tag;
 132
 133         spin_lock_irqsave(&ihost->scic_lock, flags);
 134         idev = isci_lookup_device(task->dev);
 135         io_ready = isci_device_io_ready(idev, task);
 136         tag = isci_alloc_tag(ihost);
 137         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 138
 139         dev_dbg(&ihost->pdev->dev,
 140                 "task: %p, dev: %p idev: %p:%#lx cmd = %p\n",
 141                 task, task->dev, idev, idev ? idev->flags : 0,
 142                 task->uldd_task);
 143
 144         if (!idev) {
 145                 isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
 146                                  SAS_DEVICE_UNKNOWN);
 147         } else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
 148                 /* Indicate QUEUE_FULL so that the scsi midlayer
 149                  * retries.
 150                   */
 151                 isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
 152                                  SAS_QUEUE_FULL);
 153         } else {
 154                 /* There is a device and it's ready for I/O. */
 155                 spin_lock_irqsave(&task->task_state_lock, flags);
 156
 157                 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 158                         /* The I/O was aborted. */
 159                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 160
 161                         isci_task_refuse(ihost, task,
 162                                          SAS_TASK_UNDELIVERED,
 163                                          SAM_STAT_TASK_ABORTED);
 164                 } else {
 165                         task->task_state_flags |= SAS_TASK_AT_INITIATOR;
 166                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 167
 168                         /* build and send the request. */
 169                         status = isci_request_execute(ihost, idev, task, tag);
 170
 171                         if (status != SCI_SUCCESS) {
 172                                 spin_lock_irqsave(&task->task_state_lock, flags);
 173                                 /* Did not really start this command. */
 174                                 task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 175                                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 176
 177                                 if (test_bit(IDEV_GONE, &idev->flags)) {
 178                                         /* Indicate that the device
 179                                          * is gone.
 180                                          */
 181                                         isci_task_refuse(ihost, task,
 182                                                 SAS_TASK_UNDELIVERED,
 183                                                 SAS_DEVICE_UNKNOWN);
 184                                 } else {
 185                                         /* Indicate QUEUE_FULL so that
 186                                          * the scsi midlayer retries.
 187                                          * If the request failed for
 188                                          * remote device reasons, it
 189                                          * gets returned as
 190                                          * SAS_TASK_UNDELIVERED next
 191                                          * time through.
 192                                          */
 193                                         isci_task_refuse(ihost, task,
 194                                                 SAS_TASK_COMPLETE,
 195                                                 SAS_QUEUE_FULL);
 196                                 }
 197                         }
 198                 }
 199         }
 200
 201         if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
 202                 spin_lock_irqsave(&ihost->scic_lock, flags);
 203                 /* command never hit the device, so just free
 204                  * the tci and skip the sequence increment
 205                  */
 206                 isci_tci_free(ihost, ISCI_TAG_TCI(tag));
 207                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 208         }
 209
 210         isci_put_device(idev);
 211         return 0;
 212 }
 213
 214 static struct isci_request *isci_task_request_build(struct isci_host *ihost,
 215                                                     struct isci_remote_device *idev,
 216                                                     u16 tag, struct isci_tmf *isci_tmf)
 217 {
 218         enum sci_status status = SCI_FAILURE;
 219         struct isci_request *ireq = NULL;
 220         struct domain_device *dev;
 221
 222         dev_dbg(&ihost->pdev->dev,
 223                 "%s: isci_tmf = %p\n", __func__, isci_tmf);
 224
 225         dev = idev->domain_dev;
 226
 227         /* do common allocation and init of request object. */
 228         ireq = isci_tmf_request_from_tag(ihost, isci_tmf, tag);
 229         if (!ireq)
 230                 return NULL;
 231
 232         /* let the core do it's construct. */
 233         status = sci_task_request_construct(ihost, idev, tag,
 234                                              ireq);
 235
 236         if (status != SCI_SUCCESS) {
 237                 dev_warn(&ihost->pdev->dev,
 238                          "%s: sci_task_request_construct failed - "
 239                          "status = 0x%x\n",
 240                          __func__,
 241                          status);
 242                 return NULL;
 243         }
 244
 245         /* XXX convert to get this from task->tproto like other drivers */
 246         if (dev->dev_type == SAS_END_DEVICE) {
 247                 isci_tmf->proto = SAS_PROTOCOL_SSP;
 248                 status = sci_task_request_construct_ssp(ireq);
 249                 if (status != SCI_SUCCESS)
 250                         return NULL;
 251         }
 252
 253         return ireq;
 254 }
 255
 256 static int isci_task_execute_tmf(struct isci_host *ihost,
 257                                  struct isci_remote_device *idev,
 258                                  struct isci_tmf *tmf, unsigned long timeout_ms)
 259 {
 260         DECLARE_COMPLETION_ONSTACK(completion);
 261         enum sci_task_status status = SCI_TASK_FAILURE;
 262         struct isci_request *ireq;
 263         int ret = TMF_RESP_FUNC_FAILED;
 264         unsigned long flags;
 265         unsigned long timeleft;
 266         u16 tag;
 267
 268         spin_lock_irqsave(&ihost->scic_lock, flags);
 269         tag = isci_alloc_tag(ihost);
 270         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 271
 272         if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
 273                 return ret;
 274
 275         /* sanity check, return TMF_RESP_FUNC_FAILED
 276          * if the device is not there and ready.
 277          */
 278         if (!idev ||
 279             (!test_bit(IDEV_IO_READY, &idev->flags) &&
 280              !test_bit(IDEV_IO_NCQERROR, &idev->flags))) {
 281                 dev_dbg(&ihost->pdev->dev,
 282                         "%s: idev = %p not ready (%#lx)\n",
 283                         __func__,
 284                         idev, idev ? idev->flags : 0);
 285                 goto err_tci;
 286         } else
 287                 dev_dbg(&ihost->pdev->dev,
 288                         "%s: idev = %p\n",
 289                         __func__, idev);
 290
 291         /* Assign the pointer to the TMF's completion kernel wait structure. */
 292         tmf->complete = &completion;
 293         tmf->status = SCI_FAILURE_TIMEOUT;
 294
 295         ireq = isci_task_request_build(ihost, idev, tag, tmf);
 296         if (!ireq)
 297                 goto err_tci;
 298
 299         spin_lock_irqsave(&ihost->scic_lock, flags);
 300
 301         /* start the TMF io. */
 302         status = sci_controller_start_task(ihost, idev, ireq);
 303
 304         if (status != SCI_TASK_SUCCESS) {
 305                 dev_dbg(&ihost->pdev->dev,
 306                          "%s: start_io failed - status = 0x%x, request = %p\n",
 307                          __func__,
 308                          status,
 309                          ireq);
 310                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 311                 goto err_tci;
 312         }
 313         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 314
 315         /* The RNC must be unsuspended before the TMF can get a response. */
 316         isci_remote_device_resume_from_abort(ihost, idev);
 317
 318         /* Wait for the TMF to complete, or a timeout. */
 319         timeleft = wait_for_completion_timeout(&completion,
 320                                                msecs_to_jiffies(timeout_ms));
 321
 322         if (timeleft == 0) {
 323                 /* The TMF did not complete - this could be because
 324                  * of an unplug.  Terminate the TMF request now.
 325                  */
 326                 isci_remote_device_suspend_terminate(ihost, idev, ireq);
 327         }
 328
 329         isci_print_tmf(ihost, tmf);
 330
 331         if (tmf->status == SCI_SUCCESS)
 332                 ret =  TMF_RESP_FUNC_COMPLETE;
 333         else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
 334                 dev_dbg(&ihost->pdev->dev,
 335                         "%s: tmf.status == "
 336                         "SCI_FAILURE_IO_RESPONSE_VALID\n",
 337                         __func__);
 338                 ret =  TMF_RESP_FUNC_COMPLETE;
 339         }
 340         /* Else - leave the default "failed" status alone. */
 341
 342         dev_dbg(&ihost->pdev->dev,
 343                 "%s: completed request = %p\n",
 344                 __func__,
 345                 ireq);
 346
 347         return ret;
 348
 349  err_tci:
 350         spin_lock_irqsave(&ihost->scic_lock, flags);
 351         isci_tci_free(ihost, ISCI_TAG_TCI(tag));
 352         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 353
 354         return ret;
 355 }
 356
 357 static void isci_task_build_tmf(struct isci_tmf *tmf,
 358                                 enum isci_tmf_function_codes code)
 359 {
 360         memset(tmf, 0, sizeof(*tmf));
 361         tmf->tmf_code = code;
 362 }
 363
 364 static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf,
 365                                            enum isci_tmf_function_codes code,
 366                                            struct isci_request *old_request)
 367 {
 368         isci_task_build_tmf(tmf, code);
 369         tmf->io_tag = old_request->io_tag;
 370 }
 371
 372 /**
 373  * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain
 374  *    Template functions.
 375  * @lun: This parameter specifies the lun to be reset.
 376  *
 377  * status, zero indicates success.
 378  */
 379 static int isci_task_send_lu_reset_sas(
 380         struct isci_host *isci_host,
 381         struct isci_remote_device *isci_device,
 382         u8 *lun)
 383 {
 384         struct isci_tmf tmf;
 385         int ret = TMF_RESP_FUNC_FAILED;
 386
 387         dev_dbg(&isci_host->pdev->dev,
 388                 "%s: isci_host = %p, isci_device = %p\n",
 389                 __func__, isci_host, isci_device);
 390         /* Send the LUN reset to the target.  By the time the call returns,
 391          * the TMF has fully exected in the target (in which case the return
 392          * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
 393          * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
 394          */
 395         isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset);
 396
 397         #define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
 398         ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
 399
 400         if (ret == TMF_RESP_FUNC_COMPLETE)
 401                 dev_dbg(&isci_host->pdev->dev,
 402                         "%s: %p: TMF_LU_RESET passed\n",
 403                         __func__, isci_device);
 404         else
 405                 dev_dbg(&isci_host->pdev->dev,
 406                         "%s: %p: TMF_LU_RESET failed (%x)\n",
 407                         __func__, isci_device, ret);
 408
 409         return ret;
 410 }
 411
 412 int isci_task_lu_reset(struct domain_device *dev, u8 *lun)
 413 {
 414         struct isci_host *ihost = dev_to_ihost(dev);
 415         struct isci_remote_device *idev;
 416         unsigned long flags;
 417         int ret = TMF_RESP_FUNC_COMPLETE;
 418
 419         spin_lock_irqsave(&ihost->scic_lock, flags);
 420         idev = isci_get_device(dev->lldd_dev);
 421         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 422
 423         dev_dbg(&ihost->pdev->dev,
 424                 "%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
 425                 __func__, dev, ihost, idev);
 426
 427         if (!idev) {
 428                 /* If the device is gone, escalate to I_T_Nexus_Reset. */
 429                 dev_dbg(&ihost->pdev->dev, "%s: No dev\n", __func__);
 430
 431                 ret = TMF_RESP_FUNC_FAILED;
 432                 goto out;
 433         }
 434
 435         /* Suspend the RNC, kill all TCs */
 436         if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
 437             != SCI_SUCCESS) {
 438                 /* The suspend/terminate only fails if isci_get_device fails */
 439                 ret = TMF_RESP_FUNC_FAILED;
 440                 goto out;
 441         }
 442         /* All pending I/Os have been terminated and cleaned up. */
 443         if (!test_bit(IDEV_GONE, &idev->flags)) {
 444                 if (dev_is_sata(dev))
 445                         sas_ata_schedule_reset(dev);
 446                 else
 447                         /* Send the task management part of the reset. */
 448                         ret = isci_task_send_lu_reset_sas(ihost, idev, lun);
 449         }
 450  out:
 451         isci_put_device(idev);
 452         return ret;
 453 }
 454
 455
 456 /*       int (*lldd_clear_nexus_port)(struct asd_sas_port *); */
 457 int isci_task_clear_nexus_port(struct asd_sas_port *port)
 458 {
 459         return TMF_RESP_FUNC_FAILED;
 460 }
 461
 462
 463
 464 int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
 465 {
 466         return TMF_RESP_FUNC_FAILED;
 467 }
 468
 469 /* Task Management Functions. Must be called from process context.       */
 470
 471 /**
 472  * isci_task_abort_task() - This function is one of the SAS Domain Template
 473  *    functions. This function is called by libsas to abort a specified task.
 474  * @task: This parameter specifies the SAS task to abort.
 475  *
 476  * status, zero indicates success.
 477  */
 478 int isci_task_abort_task(struct sas_task *task)
 479 {
 480         struct isci_host *ihost = dev_to_ihost(task->dev);
 481         DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
 482         struct isci_request       *old_request = NULL;
 483         struct isci_remote_device *idev = NULL;
 484         struct isci_tmf           tmf;
 485         int                       ret = TMF_RESP_FUNC_FAILED;
 486         unsigned long             flags;
 487         int                       target_done_already = 0;
 488
 489         /* Get the isci_request reference from the task.  Note that
 490          * this check does not depend on the pending request list
 491          * in the device, because tasks driving resets may land here
 492          * after completion in the core.
 493          */
 494         spin_lock_irqsave(&ihost->scic_lock, flags);
 495         spin_lock(&task->task_state_lock);
 496
 497         old_request = task->lldd_task;
 498
 499         /* If task is already done, the request isn't valid */
 500         if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
 501             (task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
 502             old_request) {
 503                 idev = isci_get_device(task->dev->lldd_dev);
 504                 target_done_already = test_bit(IREQ_COMPLETE_IN_TARGET,
 505                                                &old_request->flags);
 506         }
 507         spin_unlock(&task->task_state_lock);
 508         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 509
 510         dev_warn(&ihost->pdev->dev,
 511                  "%s: dev = %p (%s%s), task = %p, old_request == %p\n",
 512                  __func__, idev,
 513                  (dev_is_sata(task->dev) ? "STP/SATA"
 514                                          : ((dev_is_expander(task->dev))
 515                                                 ? "SMP"
 516                                                 : "SSP")),
 517                  ((idev) ? ((test_bit(IDEV_GONE, &idev->flags))
 518                            ? " IDEV_GONE"
 519                            : "")
 520                          : " <NULL>"),
 521                  task, old_request);
 522
 523         /* Device reset conditions signalled in task_state_flags are the
 524          * responsbility of libsas to observe at the start of the error
 525          * handler thread.
 526          */
 527         if (!idev || !old_request) {
 528                 /* The request has already completed and there
 529                 * is nothing to do here other than to set the task
 530                 * done bit, and indicate that the task abort function
 531                 * was successful.
 532                 */
 533                 spin_lock_irqsave(&task->task_state_lock, flags);
 534                 task->task_state_flags |= SAS_TASK_STATE_DONE;
 535                 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
 536                                             SAS_TASK_STATE_PENDING);
 537                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 538
 539                 ret = TMF_RESP_FUNC_COMPLETE;
 540
 541                 dev_warn(&ihost->pdev->dev,
 542                          "%s: abort task not needed for %p\n",
 543                          __func__, task);
 544                 goto out;
 545         }
 546         /* Suspend the RNC, kill the TC */
 547         if (isci_remote_device_suspend_terminate(ihost, idev, old_request)
 548             != SCI_SUCCESS) {
 549                 dev_warn(&ihost->pdev->dev,
 550                          "%s: isci_remote_device_reset_terminate(dev=%p, "
 551                                  "req=%p, task=%p) failed\n",
 552                          __func__, idev, old_request, task);
 553                 ret = TMF_RESP_FUNC_FAILED;
 554                 goto out;
 555         }
 556         spin_lock_irqsave(&ihost->scic_lock, flags);
 557
 558         if (task->task_proto == SAS_PROTOCOL_SMP ||
 559             sas_protocol_ata(task->task_proto) ||
 560             target_done_already ||
 561             test_bit(IDEV_GONE, &idev->flags)) {
 562
 563                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 564
 565                 /* No task to send, so explicitly resume the device here */
 566                 isci_remote_device_resume_from_abort(ihost, idev);
 567
 568                 dev_warn(&ihost->pdev->dev,
 569                          "%s: %s request"
 570                                  " or complete_in_target (%d), "
 571                                  "or IDEV_GONE (%d), thus no TMF\n",
 572                          __func__,
 573                          ((task->task_proto == SAS_PROTOCOL_SMP)
 574                           ? "SMP"
 575                           : (sas_protocol_ata(task->task_proto)
 576                                 ? "SATA/STP"
 577                                 : "<other>")
 578                           ),
 579                          test_bit(IREQ_COMPLETE_IN_TARGET,
 580                                   &old_request->flags),
 581                          test_bit(IDEV_GONE, &idev->flags));
 582
 583                 spin_lock_irqsave(&task->task_state_lock, flags);
 584                 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
 585                                             SAS_TASK_STATE_PENDING);
 586                 task->task_state_flags |= SAS_TASK_STATE_DONE;
 587                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 588
 589                 ret = TMF_RESP_FUNC_COMPLETE;
 590         } else {
 591                 /* Fill in the tmf structure */
 592                 isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
 593                                                old_request);
 594
 595                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 596
 597                 /* Send the task management request. */
 598                 #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */
 599                 ret = isci_task_execute_tmf(ihost, idev, &tmf,
 600                                             ISCI_ABORT_TASK_TIMEOUT_MS);
 601         }
 602 out:
 603         dev_warn(&ihost->pdev->dev,
 604                  "%s: Done; dev = %p, task = %p , old_request == %p\n",
 605                  __func__, idev, task, old_request);
 606         isci_put_device(idev);
 607         return ret;
 608 }
 609
 610 /**
 611  * isci_task_abort_task_set() - This function is one of the SAS Domain Template
 612  *    functions. This is one of the Task Management functoins called by libsas,
 613  *    to abort all task for the given lun.
 614  * @d_device: This parameter specifies the domain device associated with this
 615  *    request.
 616  * @lun: This parameter specifies the lun associated with this request.
 617  *
 618  * status, zero indicates success.
 619  */
 620 int isci_task_abort_task_set(
 621         struct domain_device *d_device,
 622         u8 *lun)
 623 {
 624         return TMF_RESP_FUNC_FAILED;
 625 }
 626
 627
 628 /**
 629  * isci_task_clear_aca() - This function is one of the SAS Domain Template
 630  *    functions. This is one of the Task Management functoins called by libsas.
 631  * @d_device: This parameter specifies the domain device associated with this
 632  *    request.
 633  * @lun: This parameter specifies the lun        associated with this request.
 634  *
 635  * status, zero indicates success.
 636  */
 637 int isci_task_clear_aca(
 638         struct domain_device *d_device,
 639         u8 *lun)
 640 {
 641         return TMF_RESP_FUNC_FAILED;
 642 }
 643
 644
 645
 646 /**
 647  * isci_task_clear_task_set() - This function is one of the SAS Domain Template
 648  *    functions. This is one of the Task Management functoins called by libsas.
 649  * @d_device: This parameter specifies the domain device associated with this
 650  *    request.
 651  * @lun: This parameter specifies the lun        associated with this request.
 652  *
 653  * status, zero indicates success.
 654  */
 655 int isci_task_clear_task_set(
 656         struct domain_device *d_device,
 657         u8 *lun)
 658 {
 659         return TMF_RESP_FUNC_FAILED;
 660 }
 661
 662
 663 /**
 664  * isci_task_query_task() - This function is implemented to cause libsas to
 665  *    correctly escalate the failed abort to a LUN or target reset (this is
 666  *    because sas_scsi_find_task libsas function does not correctly interpret
 667  *    all return codes from the abort task call).  When TMF_RESP_FUNC_SUCC is
 668  *    returned, libsas turns this into a LUN reset; when FUNC_FAILED is
 669  *    returned, libsas will turn this into a target reset
 670  * @task: This parameter specifies the sas task being queried.
 671  * @lun: This parameter specifies the lun associated with this request.
 672  *
 673  * status, zero indicates success.
 674  */
 675 int isci_task_query_task(
 676         struct sas_task *task)
 677 {
 678         /* See if there is a pending device reset for this device. */
 679         if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
 680                 return TMF_RESP_FUNC_FAILED;
 681         else
 682                 return TMF_RESP_FUNC_SUCC;
 683 }
 684
 685 /*
 686  * isci_task_request_complete() - This function is called by the sci core when
 687  *    an task request completes.
 688  * @ihost: This parameter specifies the ISCI host object
 689  * @ireq: This parameter is the completed isci_request object.
 690  * @completion_status: This parameter specifies the completion status from the
 691  *    sci core.
 692  *
 693  * none.
 694  */
 695 void
 696 isci_task_request_complete(struct isci_host *ihost,
 697                            struct isci_request *ireq,
 698                            enum sci_task_status completion_status)
 699 {
 700         struct isci_tmf *tmf = isci_request_access_tmf(ireq);
 701         struct completion *tmf_complete = NULL;
 702
 703         dev_dbg(&ihost->pdev->dev,
 704                 "%s: request = %p, status=%d\n",
 705                 __func__, ireq, completion_status);
 706
 707         set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
 708
 709         if (tmf) {
 710                 tmf->status = completion_status;
 711
 712                 if (tmf->proto == SAS_PROTOCOL_SSP) {
 713                         memcpy(&tmf->resp.resp_iu,
 714                                &ireq->ssp.rsp,
 715                                SSP_RESP_IU_MAX_SIZE);
 716                 } else if (tmf->proto == SAS_PROTOCOL_SATA) {
 717                         memcpy(&tmf->resp.d2h_fis,
 718                                &ireq->stp.rsp,
 719                                sizeof(struct dev_to_host_fis));
 720                 }
 721                 /* PRINT_TMF( ((struct isci_tmf *)request->task)); */
 722                 tmf_complete = tmf->complete;
 723         }
 724         sci_controller_complete_io(ihost, ireq->target_device, ireq);
 725         /* set the 'terminated' flag handle to make sure it cannot be terminated
 726          *  or completed again.
 727          */
 728         set_bit(IREQ_TERMINATED, &ireq->flags);
 729
 730         if (test_and_clear_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags))
 731                 wake_up_all(&ihost->eventq);
 732
 733         if (!test_bit(IREQ_NO_AUTO_FREE_TAG, &ireq->flags))
 734                 isci_free_tag(ihost, ireq->io_tag);
 735
 736         /* The task management part completes last. */
 737         if (tmf_complete)
 738                 complete(tmf_complete);
 739 }
 740
 741 static int isci_reset_device(struct isci_host *ihost,
 742                              struct domain_device *dev,
 743                              struct isci_remote_device *idev)
 744 {
 745         int rc = TMF_RESP_FUNC_COMPLETE, reset_stat = -1;
 746         struct sas_phy *phy = sas_get_local_phy(dev);
 747         struct isci_port *iport = dev->port->lldd_port;
 748
 749         dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
 750
 751         /* Suspend the RNC, terminate all outstanding TCs. */
 752         if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
 753             != SCI_SUCCESS) {
 754                 rc = TMF_RESP_FUNC_FAILED;
 755                 goto out;
 756         }
 757         /* Note that since the termination for outstanding requests succeeded,
 758          * this function will return success.  This is because the resets will
 759          * only fail if the device has been removed (ie. hotplug), and the
 760          * primary duty of this function is to cleanup tasks, so that is the
 761          * relevant status.
 762          */
 763         if (!test_bit(IDEV_GONE, &idev->flags)) {
 764                 if (scsi_is_sas_phy_local(phy)) {
 765                         struct isci_phy *iphy = &ihost->phys[phy->number];
 766
 767                         reset_stat = isci_port_perform_hard_reset(ihost, iport,
 768                                                                   iphy);
 769                 } else
 770                         reset_stat = sas_phy_reset(phy, !dev_is_sata(dev));
 771         }
 772         /* Explicitly resume the RNC here, since there was no task sent. */
 773         isci_remote_device_resume_from_abort(ihost, idev);
 774
 775         dev_dbg(&ihost->pdev->dev, "%s: idev %p complete, reset_stat=%d.\n",
 776                 __func__, idev, reset_stat);
 777  out:
 778         sas_put_local_phy(phy);
 779         return rc;
 780 }
 781
 782 int isci_task_I_T_nexus_reset(struct domain_device *dev)
 783 {
 784         struct isci_host *ihost = dev_to_ihost(dev);
 785         struct isci_remote_device *idev;
 786         unsigned long flags;
 787         int ret;
 788
 789         spin_lock_irqsave(&ihost->scic_lock, flags);
 790         idev = isci_get_device(dev->lldd_dev);
 791         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 792
 793         if (!idev) {
 794                 /* XXX: need to cleanup any ireqs targeting this
 795                  * domain_device
 796                  */
 797                 ret = -ENODEV;
 798                 goto out;
 799         }
 800
 801         ret = isci_reset_device(ihost, dev, idev);
 802  out:
 803         isci_put_device(idev);
 804         return ret;
 805 }