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  * @num: This parameter specifies the number of tasks to queue.
 121  * @gfp_flags: This parameter specifies the context of this call.
 122  *
 123  * status, zero indicates success.
 124  */
 125 int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags)
 126 {
 127         struct isci_host *ihost = dev_to_ihost(task->dev);
 128         struct isci_remote_device *idev;
 129         unsigned long flags;
 130         bool io_ready;
 131         u16 tag;
 132
 133         dev_dbg(&ihost->pdev->dev, "%s: num=%d\n", __func__, num);
 134
 135         for_each_sas_task(num, task) {
 136                 enum sci_status status = SCI_FAILURE;
 137
 138                 spin_lock_irqsave(&ihost->scic_lock, flags);
 139                 idev = isci_lookup_device(task->dev);
 140                 io_ready = isci_device_io_ready(idev, task);
 141                 tag = isci_alloc_tag(ihost);
 142                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 143
 144                 dev_dbg(&ihost->pdev->dev,
 145                         "task: %p, num: %d dev: %p idev: %p:%#lx cmd = %p\n",
 146                         task, num, task->dev, idev, idev ? idev->flags : 0,
 147                         task->uldd_task);
 148
 149                 if (!idev) {
 150                         isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
 151                                          SAS_DEVICE_UNKNOWN);
 152                 } else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
 153                         /* Indicate QUEUE_FULL so that the scsi midlayer
 154                          * retries.
 155                           */
 156                         isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
 157                                          SAS_QUEUE_FULL);
 158                 } else {
 159                         /* There is a device and it's ready for I/O. */
 160                         spin_lock_irqsave(&task->task_state_lock, flags);
 161
 162                         if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 163                                 /* The I/O was aborted. */
 164                                 spin_unlock_irqrestore(&task->task_state_lock,
 165                                                        flags);
 166
 167                                 isci_task_refuse(ihost, task,
 168                                                  SAS_TASK_UNDELIVERED,
 169                                                  SAM_STAT_TASK_ABORTED);
 170                         } else {
 171                                 task->task_state_flags |= SAS_TASK_AT_INITIATOR;
 172                                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 173
 174                                 /* build and send the request. */
 175                                 status = isci_request_execute(ihost, idev, task, tag);
 176
 177                                 if (status != SCI_SUCCESS) {
 178
 179                                         spin_lock_irqsave(&task->task_state_lock, flags);
 180                                         /* Did not really start this command. */
 181                                         task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 182                                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 183
 184                                         if (test_bit(IDEV_GONE, &idev->flags)) {
 185
 186                                                 /* Indicate that the device
 187                                                  * is gone.
 188                                                  */
 189                                                 isci_task_refuse(ihost, task,
 190                                                         SAS_TASK_UNDELIVERED,
 191                                                         SAS_DEVICE_UNKNOWN);
 192                                         } else {
 193                                                 /* Indicate QUEUE_FULL so that
 194                                                  * the scsi midlayer retries.
 195                                                  * If the request failed for
 196                                                  * remote device reasons, it
 197                                                  * gets returned as
 198                                                  * SAS_TASK_UNDELIVERED next
 199                                                  * time through.
 200                                                  */
 201                                                 isci_task_refuse(ihost, task,
 202                                                         SAS_TASK_COMPLETE,
 203                                                         SAS_QUEUE_FULL);
 204                                         }
 205                                 }
 206                         }
 207                 }
 208                 if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
 209                         spin_lock_irqsave(&ihost->scic_lock, flags);
 210                         /* command never hit the device, so just free
 211                          * the tci and skip the sequence increment
 212                          */
 213                         isci_tci_free(ihost, ISCI_TAG_TCI(tag));
 214                         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 215                 }
 216                 isci_put_device(idev);
 217         }
 218         return 0;
 219 }
 220
 221 static struct isci_request *isci_task_request_build(struct isci_host *ihost,
 222                                                     struct isci_remote_device *idev,
 223                                                     u16 tag, struct isci_tmf *isci_tmf)
 224 {
 225         enum sci_status status = SCI_FAILURE;
 226         struct isci_request *ireq = NULL;
 227         struct domain_device *dev;
 228
 229         dev_dbg(&ihost->pdev->dev,
 230                 "%s: isci_tmf = %p\n", __func__, isci_tmf);
 231
 232         dev = idev->domain_dev;
 233
 234         /* do common allocation and init of request object. */
 235         ireq = isci_tmf_request_from_tag(ihost, isci_tmf, tag);
 236         if (!ireq)
 237                 return NULL;
 238
 239         /* let the core do it's construct. */
 240         status = sci_task_request_construct(ihost, idev, tag,
 241                                              ireq);
 242
 243         if (status != SCI_SUCCESS) {
 244                 dev_warn(&ihost->pdev->dev,
 245                          "%s: sci_task_request_construct failed - "
 246                          "status = 0x%x\n",
 247                          __func__,
 248                          status);
 249                 return NULL;
 250         }
 251
 252         /* XXX convert to get this from task->tproto like other drivers */
 253         if (dev->dev_type == SAS_END_DEVICE) {
 254                 isci_tmf->proto = SAS_PROTOCOL_SSP;
 255                 status = sci_task_request_construct_ssp(ireq);
 256                 if (status != SCI_SUCCESS)
 257                         return NULL;
 258         }
 259
 260         return ireq;
 261 }
 262
 263 static int isci_task_execute_tmf(struct isci_host *ihost,
 264                                  struct isci_remote_device *idev,
 265                                  struct isci_tmf *tmf, unsigned long timeout_ms)
 266 {
 267         DECLARE_COMPLETION_ONSTACK(completion);
 268         enum sci_task_status status = SCI_TASK_FAILURE;
 269         struct isci_request *ireq;
 270         int ret = TMF_RESP_FUNC_FAILED;
 271         unsigned long flags;
 272         unsigned long timeleft;
 273         u16 tag;
 274
 275         spin_lock_irqsave(&ihost->scic_lock, flags);
 276         tag = isci_alloc_tag(ihost);
 277         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 278
 279         if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
 280                 return ret;
 281
 282         /* sanity check, return TMF_RESP_FUNC_FAILED
 283          * if the device is not there and ready.
 284          */
 285         if (!idev ||
 286             (!test_bit(IDEV_IO_READY, &idev->flags) &&
 287              !test_bit(IDEV_IO_NCQERROR, &idev->flags))) {
 288                 dev_dbg(&ihost->pdev->dev,
 289                         "%s: idev = %p not ready (%#lx)\n",
 290                         __func__,
 291                         idev, idev ? idev->flags : 0);
 292                 goto err_tci;
 293         } else
 294                 dev_dbg(&ihost->pdev->dev,
 295                         "%s: idev = %p\n",
 296                         __func__, idev);
 297
 298         /* Assign the pointer to the TMF's completion kernel wait structure. */
 299         tmf->complete = &completion;
 300         tmf->status = SCI_FAILURE_TIMEOUT;
 301
 302         ireq = isci_task_request_build(ihost, idev, tag, tmf);
 303         if (!ireq)
 304                 goto err_tci;
 305
 306         spin_lock_irqsave(&ihost->scic_lock, flags);
 307
 308         /* start the TMF io. */
 309         status = sci_controller_start_task(ihost, idev, ireq);
 310
 311         if (status != SCI_TASK_SUCCESS) {
 312                 dev_dbg(&ihost->pdev->dev,
 313                          "%s: start_io failed - status = 0x%x, request = %p\n",
 314                          __func__,
 315                          status,
 316                          ireq);
 317                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 318                 goto err_tci;
 319         }
 320         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 321
 322         /* The RNC must be unsuspended before the TMF can get a response. */
 323         isci_remote_device_resume_from_abort(ihost, idev);
 324
 325         /* Wait for the TMF to complete, or a timeout. */
 326         timeleft = wait_for_completion_timeout(&completion,
 327                                                msecs_to_jiffies(timeout_ms));
 328
 329         if (timeleft == 0) {
 330                 /* The TMF did not complete - this could be because
 331                  * of an unplug.  Terminate the TMF request now.
 332                  */
 333                 isci_remote_device_suspend_terminate(ihost, idev, ireq);
 334         }
 335
 336         isci_print_tmf(ihost, tmf);
 337
 338         if (tmf->status == SCI_SUCCESS)
 339                 ret =  TMF_RESP_FUNC_COMPLETE;
 340         else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
 341                 dev_dbg(&ihost->pdev->dev,
 342                         "%s: tmf.status == "
 343                         "SCI_FAILURE_IO_RESPONSE_VALID\n",
 344                         __func__);
 345                 ret =  TMF_RESP_FUNC_COMPLETE;
 346         }
 347         /* Else - leave the default "failed" status alone. */
 348
 349         dev_dbg(&ihost->pdev->dev,
 350                 "%s: completed request = %p\n",
 351                 __func__,
 352                 ireq);
 353
 354         return ret;
 355
 356  err_tci:
 357         spin_lock_irqsave(&ihost->scic_lock, flags);
 358         isci_tci_free(ihost, ISCI_TAG_TCI(tag));
 359         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 360
 361         return ret;
 362 }
 363
 364 static void isci_task_build_tmf(struct isci_tmf *tmf,
 365                                 enum isci_tmf_function_codes code)
 366 {
 367         memset(tmf, 0, sizeof(*tmf));
 368         tmf->tmf_code = code;
 369 }
 370
 371 static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf,
 372                                            enum isci_tmf_function_codes code,
 373                                            struct isci_request *old_request)
 374 {
 375         isci_task_build_tmf(tmf, code);
 376         tmf->io_tag = old_request->io_tag;
 377 }
 378
 379 /**
 380  * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain
 381  *    Template functions.
 382  * @lun: This parameter specifies the lun to be reset.
 383  *
 384  * status, zero indicates success.
 385  */
 386 static int isci_task_send_lu_reset_sas(
 387         struct isci_host *isci_host,
 388         struct isci_remote_device *isci_device,
 389         u8 *lun)
 390 {
 391         struct isci_tmf tmf;
 392         int ret = TMF_RESP_FUNC_FAILED;
 393
 394         dev_dbg(&isci_host->pdev->dev,
 395                 "%s: isci_host = %p, isci_device = %p\n",
 396                 __func__, isci_host, isci_device);
 397         /* Send the LUN reset to the target.  By the time the call returns,
 398          * the TMF has fully exected in the target (in which case the return
 399          * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
 400          * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
 401          */
 402         isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset);
 403
 404         #define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
 405         ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
 406
 407         if (ret == TMF_RESP_FUNC_COMPLETE)
 408                 dev_dbg(&isci_host->pdev->dev,
 409                         "%s: %p: TMF_LU_RESET passed\n",
 410                         __func__, isci_device);
 411         else
 412                 dev_dbg(&isci_host->pdev->dev,
 413                         "%s: %p: TMF_LU_RESET failed (%x)\n",
 414                         __func__, isci_device, ret);
 415
 416         return ret;
 417 }
 418
 419 int isci_task_lu_reset(struct domain_device *dev, u8 *lun)
 420 {
 421         struct isci_host *ihost = dev_to_ihost(dev);
 422         struct isci_remote_device *idev;
 423         unsigned long flags;
 424         int ret = TMF_RESP_FUNC_COMPLETE;
 425
 426         spin_lock_irqsave(&ihost->scic_lock, flags);
 427         idev = isci_get_device(dev->lldd_dev);
 428         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 429
 430         dev_dbg(&ihost->pdev->dev,
 431                 "%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
 432                 __func__, dev, ihost, idev);
 433
 434         if (!idev) {
 435                 /* If the device is gone, escalate to I_T_Nexus_Reset. */
 436                 dev_dbg(&ihost->pdev->dev, "%s: No dev\n", __func__);
 437
 438                 ret = TMF_RESP_FUNC_FAILED;
 439                 goto out;
 440         }
 441
 442         /* Suspend the RNC, kill all TCs */
 443         if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
 444             != SCI_SUCCESS) {
 445                 /* The suspend/terminate only fails if isci_get_device fails */
 446                 ret = TMF_RESP_FUNC_FAILED;
 447                 goto out;
 448         }
 449         /* All pending I/Os have been terminated and cleaned up. */
 450         if (!test_bit(IDEV_GONE, &idev->flags)) {
 451                 if (dev_is_sata(dev))
 452                         sas_ata_schedule_reset(dev);
 453                 else
 454                         /* Send the task management part of the reset. */
 455                         ret = isci_task_send_lu_reset_sas(ihost, idev, lun);
 456         }
 457  out:
 458         isci_put_device(idev);
 459         return ret;
 460 }
 461
 462
 463 /*       int (*lldd_clear_nexus_port)(struct asd_sas_port *); */
 464 int isci_task_clear_nexus_port(struct asd_sas_port *port)
 465 {
 466         return TMF_RESP_FUNC_FAILED;
 467 }
 468
 469
 470
 471 int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
 472 {
 473         return TMF_RESP_FUNC_FAILED;
 474 }
 475
 476 /* Task Management Functions. Must be called from process context.       */
 477
 478 /**
 479  * isci_task_abort_task() - This function is one of the SAS Domain Template
 480  *    functions. This function is called by libsas to abort a specified task.
 481  * @task: This parameter specifies the SAS task to abort.
 482  *
 483  * status, zero indicates success.
 484  */
 485 int isci_task_abort_task(struct sas_task *task)
 486 {
 487         struct isci_host *ihost = dev_to_ihost(task->dev);
 488         DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
 489         struct isci_request       *old_request = NULL;
 490         struct isci_remote_device *idev = NULL;
 491         struct isci_tmf           tmf;
 492         int                       ret = TMF_RESP_FUNC_FAILED;
 493         unsigned long             flags;
 494         int                       target_done_already = 0;
 495
 496         /* Get the isci_request reference from the task.  Note that
 497          * this check does not depend on the pending request list
 498          * in the device, because tasks driving resets may land here
 499          * after completion in the core.
 500          */
 501         spin_lock_irqsave(&ihost->scic_lock, flags);
 502         spin_lock(&task->task_state_lock);
 503
 504         old_request = task->lldd_task;
 505
 506         /* If task is already done, the request isn't valid */
 507         if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
 508             (task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
 509             old_request) {
 510                 idev = isci_get_device(task->dev->lldd_dev);
 511                 target_done_already = test_bit(IREQ_COMPLETE_IN_TARGET,
 512                                                &old_request->flags);
 513         }
 514         spin_unlock(&task->task_state_lock);
 515         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 516
 517         dev_warn(&ihost->pdev->dev,
 518                  "%s: dev = %p (%s%s), task = %p, old_request == %p\n",
 519                  __func__, idev,
 520                  (dev_is_sata(task->dev) ? "STP/SATA"
 521                                          : ((dev_is_expander(task->dev))
 522                                                 ? "SMP"
 523                                                 : "SSP")),
 524                  ((idev) ? ((test_bit(IDEV_GONE, &idev->flags))
 525                            ? " IDEV_GONE"
 526                            : "")
 527                          : " <NULL>"),
 528                  task, old_request);
 529
 530         /* Device reset conditions signalled in task_state_flags are the
 531          * responsbility of libsas to observe at the start of the error
 532          * handler thread.
 533          */
 534         if (!idev || !old_request) {
 535                 /* The request has already completed and there
 536                 * is nothing to do here other than to set the task
 537                 * done bit, and indicate that the task abort function
 538                 * was successful.
 539                 */
 540                 spin_lock_irqsave(&task->task_state_lock, flags);
 541                 task->task_state_flags |= SAS_TASK_STATE_DONE;
 542                 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
 543                                             SAS_TASK_STATE_PENDING);
 544                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 545
 546                 ret = TMF_RESP_FUNC_COMPLETE;
 547
 548                 dev_warn(&ihost->pdev->dev,
 549                          "%s: abort task not needed for %p\n",
 550                          __func__, task);
 551                 goto out;
 552         }
 553         /* Suspend the RNC, kill the TC */
 554         if (isci_remote_device_suspend_terminate(ihost, idev, old_request)
 555             != SCI_SUCCESS) {
 556                 dev_warn(&ihost->pdev->dev,
 557                          "%s: isci_remote_device_reset_terminate(dev=%p, "
 558                                  "req=%p, task=%p) failed\n",
 559                          __func__, idev, old_request, task);
 560                 ret = TMF_RESP_FUNC_FAILED;
 561                 goto out;
 562         }
 563         spin_lock_irqsave(&ihost->scic_lock, flags);
 564
 565         if (task->task_proto == SAS_PROTOCOL_SMP ||
 566             sas_protocol_ata(task->task_proto) ||
 567             target_done_already ||
 568             test_bit(IDEV_GONE, &idev->flags)) {
 569
 570                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 571
 572                 /* No task to send, so explicitly resume the device here */
 573                 isci_remote_device_resume_from_abort(ihost, idev);
 574
 575                 dev_warn(&ihost->pdev->dev,
 576                          "%s: %s request"
 577                                  " or complete_in_target (%d), "
 578                                  "or IDEV_GONE (%d), thus no TMF\n",
 579                          __func__,
 580                          ((task->task_proto == SAS_PROTOCOL_SMP)
 581                           ? "SMP"
 582                           : (sas_protocol_ata(task->task_proto)
 583                                 ? "SATA/STP"
 584                                 : "<other>")
 585                           ),
 586                          test_bit(IREQ_COMPLETE_IN_TARGET,
 587                                   &old_request->flags),
 588                          test_bit(IDEV_GONE, &idev->flags));
 589
 590                 spin_lock_irqsave(&task->task_state_lock, flags);
 591                 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
 592                                             SAS_TASK_STATE_PENDING);
 593                 task->task_state_flags |= SAS_TASK_STATE_DONE;
 594                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 595
 596                 ret = TMF_RESP_FUNC_COMPLETE;
 597         } else {
 598                 /* Fill in the tmf stucture */
 599                 isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
 600                                                old_request);
 601
 602                 spin_unlock_irqrestore(&ihost->scic_lock, flags);
 603
 604                 /* Send the task management request. */
 605                 #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */
 606                 ret = isci_task_execute_tmf(ihost, idev, &tmf,
 607                                             ISCI_ABORT_TASK_TIMEOUT_MS);
 608         }
 609 out:
 610         dev_warn(&ihost->pdev->dev,
 611                  "%s: Done; dev = %p, task = %p , old_request == %p\n",
 612                  __func__, idev, task, old_request);
 613         isci_put_device(idev);
 614         return ret;
 615 }
 616
 617 /**
 618  * isci_task_abort_task_set() - This function is one of the SAS Domain Template
 619  *    functions. This is one of the Task Management functoins called by libsas,
 620  *    to abort all task for the given lun.
 621  * @d_device: This parameter specifies the domain device associated with this
 622  *    request.
 623  * @lun: This parameter specifies the lun associated with this request.
 624  *
 625  * status, zero indicates success.
 626  */
 627 int isci_task_abort_task_set(
 628         struct domain_device *d_device,
 629         u8 *lun)
 630 {
 631         return TMF_RESP_FUNC_FAILED;
 632 }
 633
 634
 635 /**
 636  * isci_task_clear_aca() - This function is one of the SAS Domain Template
 637  *    functions. This is one of the Task Management functoins called by libsas.
 638  * @d_device: This parameter specifies the domain device associated with this
 639  *    request.
 640  * @lun: This parameter specifies the lun        associated with this request.
 641  *
 642  * status, zero indicates success.
 643  */
 644 int isci_task_clear_aca(
 645         struct domain_device *d_device,
 646         u8 *lun)
 647 {
 648         return TMF_RESP_FUNC_FAILED;
 649 }
 650
 651
 652
 653 /**
 654  * isci_task_clear_task_set() - This function is one of the SAS Domain Template
 655  *    functions. This is one of the Task Management functoins called by libsas.
 656  * @d_device: This parameter specifies the domain device associated with this
 657  *    request.
 658  * @lun: This parameter specifies the lun        associated with this request.
 659  *
 660  * status, zero indicates success.
 661  */
 662 int isci_task_clear_task_set(
 663         struct domain_device *d_device,
 664         u8 *lun)
 665 {
 666         return TMF_RESP_FUNC_FAILED;
 667 }
 668
 669
 670 /**
 671  * isci_task_query_task() - This function is implemented to cause libsas to
 672  *    correctly escalate the failed abort to a LUN or target reset (this is
 673  *    because sas_scsi_find_task libsas function does not correctly interpret
 674  *    all return codes from the abort task call).  When TMF_RESP_FUNC_SUCC is
 675  *    returned, libsas turns this into a LUN reset; when FUNC_FAILED is
 676  *    returned, libsas will turn this into a target reset
 677  * @task: This parameter specifies the sas task being queried.
 678  * @lun: This parameter specifies the lun associated with this request.
 679  *
 680  * status, zero indicates success.
 681  */
 682 int isci_task_query_task(
 683         struct sas_task *task)
 684 {
 685         /* See if there is a pending device reset for this device. */
 686         if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
 687                 return TMF_RESP_FUNC_FAILED;
 688         else
 689                 return TMF_RESP_FUNC_SUCC;
 690 }
 691
 692 /*
 693  * isci_task_request_complete() - This function is called by the sci core when
 694  *    an task request completes.
 695  * @ihost: This parameter specifies the ISCI host object
 696  * @ireq: This parameter is the completed isci_request object.
 697  * @completion_status: This parameter specifies the completion status from the
 698  *    sci core.
 699  *
 700  * none.
 701  */
 702 void
 703 isci_task_request_complete(struct isci_host *ihost,
 704                            struct isci_request *ireq,
 705                            enum sci_task_status completion_status)
 706 {
 707         struct isci_tmf *tmf = isci_request_access_tmf(ireq);
 708         struct completion *tmf_complete = NULL;
 709
 710         dev_dbg(&ihost->pdev->dev,
 711                 "%s: request = %p, status=%d\n",
 712                 __func__, ireq, completion_status);
 713
 714         set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
 715
 716         if (tmf) {
 717                 tmf->status = completion_status;
 718
 719                 if (tmf->proto == SAS_PROTOCOL_SSP) {
 720                         memcpy(&tmf->resp.resp_iu,
 721                                &ireq->ssp.rsp,
 722                                SSP_RESP_IU_MAX_SIZE);
 723                 } else if (tmf->proto == SAS_PROTOCOL_SATA) {
 724                         memcpy(&tmf->resp.d2h_fis,
 725                                &ireq->stp.rsp,
 726                                sizeof(struct dev_to_host_fis));
 727                 }
 728                 /* PRINT_TMF( ((struct isci_tmf *)request->task)); */
 729                 tmf_complete = tmf->complete;
 730         }
 731         sci_controller_complete_io(ihost, ireq->target_device, ireq);
 732         /* set the 'terminated' flag handle to make sure it cannot be terminated
 733          *  or completed again.
 734          */
 735         set_bit(IREQ_TERMINATED, &ireq->flags);
 736
 737         if (test_and_clear_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags))
 738                 wake_up_all(&ihost->eventq);
 739
 740         if (!test_bit(IREQ_NO_AUTO_FREE_TAG, &ireq->flags))
 741                 isci_free_tag(ihost, ireq->io_tag);
 742
 743         /* The task management part completes last. */
 744         if (tmf_complete)
 745                 complete(tmf_complete);
 746 }
 747
 748 static int isci_reset_device(struct isci_host *ihost,
 749                              struct domain_device *dev,
 750                              struct isci_remote_device *idev)
 751 {
 752         int rc = TMF_RESP_FUNC_COMPLETE, reset_stat = -1;
 753         struct sas_phy *phy = sas_get_local_phy(dev);
 754         struct isci_port *iport = dev->port->lldd_port;
 755
 756         dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
 757
 758         /* Suspend the RNC, terminate all outstanding TCs. */
 759         if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
 760             != SCI_SUCCESS) {
 761                 rc = TMF_RESP_FUNC_FAILED;
 762                 goto out;
 763         }
 764         /* Note that since the termination for outstanding requests succeeded,
 765          * this function will return success.  This is because the resets will
 766          * only fail if the device has been removed (ie. hotplug), and the
 767          * primary duty of this function is to cleanup tasks, so that is the
 768          * relevant status.
 769          */
 770         if (!test_bit(IDEV_GONE, &idev->flags)) {
 771                 if (scsi_is_sas_phy_local(phy)) {
 772                         struct isci_phy *iphy = &ihost->phys[phy->number];
 773
 774                         reset_stat = isci_port_perform_hard_reset(ihost, iport,
 775                                                                   iphy);
 776                 } else
 777                         reset_stat = sas_phy_reset(phy, !dev_is_sata(dev));
 778         }
 779         /* Explicitly resume the RNC here, since there was no task sent. */
 780         isci_remote_device_resume_from_abort(ihost, idev);
 781
 782         dev_dbg(&ihost->pdev->dev, "%s: idev %p complete, reset_stat=%d.\n",
 783                 __func__, idev, reset_stat);
 784  out:
 785         sas_put_local_phy(phy);
 786         return rc;
 787 }
 788
 789 int isci_task_I_T_nexus_reset(struct domain_device *dev)
 790 {
 791         struct isci_host *ihost = dev_to_ihost(dev);
 792         struct isci_remote_device *idev;
 793         unsigned long flags;
 794         int ret;
 795
 796         spin_lock_irqsave(&ihost->scic_lock, flags);
 797         idev = isci_get_device(dev->lldd_dev);
 798         spin_unlock_irqrestore(&ihost->scic_lock, flags);
 799
 800         if (!idev) {
 801                 /* XXX: need to cleanup any ireqs targeting this
 802                  * domain_device
 803                  */
 804                 ret = TMF_RESP_FUNC_COMPLETE;
 805                 goto out;
 806         }
 807
 808         ret = isci_reset_device(ihost, dev, idev);
 809  out:
 810         isci_put_device(idev);
 811         return ret;
 812 }