drivers/scsi/libsas/sas_scsi_host.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Serial Attached SCSI (SAS) class SCSI Host glue.
   4  *
   5  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   6  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   7  */
   8
   9 #include <linux/kthread.h>
  10 #include <linux/firmware.h>
  11 #include <linux/export.h>
  12 #include <linux/ctype.h>
  13 #include <linux/kernel.h>
  14
  15 #include "sas_internal.h"
  16
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_tcq.h>
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_eh.h>
  22 #include <scsi/scsi_transport.h>
  23 #include <scsi/scsi_transport_sas.h>
  24 #include <scsi/sas_ata.h>
  25 #include "scsi_sas_internal.h"
  26 #include "scsi_transport_api.h"
  27 #include "scsi_priv.h"
  28
  29 #include <linux/err.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/freezer.h>
  32 #include <linux/gfp.h>
  33 #include <linux/scatterlist.h>
  34 #include <linux/libata.h>
  35
  36 /* record final status and free the task */
  37 static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
  38 {
  39         struct task_status_struct *ts = &task->task_status;
  40         enum scsi_host_status hs = DID_OK;
  41         enum exec_status stat = SAS_SAM_STAT_GOOD;
  42
  43         if (ts->resp == SAS_TASK_UNDELIVERED) {
  44                 /* transport error */
  45                 hs = DID_NO_CONNECT;
  46         } else { /* ts->resp == SAS_TASK_COMPLETE */
  47                 /* task delivered, what happened afterwards? */
  48                 switch (ts->stat) {
  49                 case SAS_DEV_NO_RESPONSE:
  50                 case SAS_INTERRUPTED:
  51                 case SAS_PHY_DOWN:
  52                 case SAS_NAK_R_ERR:
  53                 case SAS_OPEN_TO:
  54                         hs = DID_NO_CONNECT;
  55                         break;
  56                 case SAS_DATA_UNDERRUN:
  57                         scsi_set_resid(sc, ts->residual);
  58                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  59                                 hs = DID_ERROR;
  60                         break;
  61                 case SAS_DATA_OVERRUN:
  62                         hs = DID_ERROR;
  63                         break;
  64                 case SAS_QUEUE_FULL:
  65                         hs = DID_SOFT_ERROR; /* retry */
  66                         break;
  67                 case SAS_DEVICE_UNKNOWN:
  68                         hs = DID_BAD_TARGET;
  69                         break;
  70                 case SAS_OPEN_REJECT:
  71                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
  72                                 hs = DID_SOFT_ERROR; /* retry */
  73                         else
  74                                 hs = DID_ERROR;
  75                         break;
  76                 case SAS_PROTO_RESPONSE:
  77                         pr_notice("LLDD:%s sent SAS_PROTO_RESP for an SSP task; please report this\n",
  78                                   task->dev->port->ha->sas_ha_name);
  79                         break;
  80                 case SAS_ABORTED_TASK:
  81                         hs = DID_ABORT;
  82                         break;
  83                 case SAS_SAM_STAT_CHECK_CONDITION:
  84                         memcpy(sc->sense_buffer, ts->buf,
  85                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
  86                         stat = SAS_SAM_STAT_CHECK_CONDITION;
  87                         break;
  88                 default:
  89                         stat = ts->stat;
  90                         break;
  91                 }
  92         }
  93
  94         sc->result = (hs << 16) | stat;
  95         ASSIGN_SAS_TASK(sc, NULL);
  96         sas_free_task(task);
  97 }
  98
  99 static void sas_scsi_task_done(struct sas_task *task)
 100 {
 101         struct scsi_cmnd *sc = task->uldd_task;
 102         struct domain_device *dev = task->dev;
 103         struct sas_ha_struct *ha = dev->port->ha;
 104         unsigned long flags;
 105
 106         spin_lock_irqsave(&dev->done_lock, flags);
 107         if (test_bit(SAS_HA_FROZEN, &ha->state))
 108                 task = NULL;
 109         else
 110                 ASSIGN_SAS_TASK(sc, NULL);
 111         spin_unlock_irqrestore(&dev->done_lock, flags);
 112
 113         if (unlikely(!task)) {
 114                 /* task will be completed by the error handler */
 115                 pr_debug("task done but aborted\n");
 116                 return;
 117         }
 118
 119         if (unlikely(!sc)) {
 120                 pr_debug("task_done called with non existing SCSI cmnd!\n");
 121                 sas_free_task(task);
 122                 return;
 123         }
 124
 125         sas_end_task(sc, task);
 126         scsi_done(sc);
 127 }
 128
 129 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 130                                                struct domain_device *dev,
 131                                                gfp_t gfp_flags)
 132 {
 133         struct sas_task *task = sas_alloc_task(gfp_flags);
 134         struct scsi_lun lun;
 135
 136         if (!task)
 137                 return NULL;
 138
 139         task->uldd_task = cmd;
 140         ASSIGN_SAS_TASK(cmd, task);
 141
 142         task->dev = dev;
 143         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 144
 145         task->ssp_task.retry_count = 1;
 146         int_to_scsilun(cmd->device->lun, &lun);
 147         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 148         task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
 149         task->ssp_task.cmd = cmd;
 150
 151         task->scatter = scsi_sglist(cmd);
 152         task->num_scatter = scsi_sg_count(cmd);
 153         task->total_xfer_len = scsi_bufflen(cmd);
 154         task->data_dir = cmd->sc_data_direction;
 155
 156         task->task_done = sas_scsi_task_done;
 157
 158         return task;
 159 }
 160
 161 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 162 {
 163         struct sas_internal *i = to_sas_internal(host->transportt);
 164         struct domain_device *dev = cmd_to_domain_dev(cmd);
 165         struct sas_task *task;
 166         int res = 0;
 167
 168         /* If the device fell off, no sense in issuing commands */
 169         if (test_bit(SAS_DEV_GONE, &dev->state)) {
 170                 cmd->result = DID_BAD_TARGET << 16;
 171                 goto out_done;
 172         }
 173
 174         if (dev_is_sata(dev)) {
 175                 spin_lock_irq(dev->sata_dev.ap->lock);
 176                 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
 177                 spin_unlock_irq(dev->sata_dev.ap->lock);
 178                 return res;
 179         }
 180
 181         task = sas_create_task(cmd, dev, GFP_ATOMIC);
 182         if (!task)
 183                 return SCSI_MLQUEUE_HOST_BUSY;
 184
 185         res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
 186         if (res)
 187                 goto out_free_task;
 188         return 0;
 189
 190 out_free_task:
 191         pr_debug("lldd_execute_task returned: %d\n", res);
 192         ASSIGN_SAS_TASK(cmd, NULL);
 193         sas_free_task(task);
 194         if (res == -SAS_QUEUE_FULL)
 195                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 196         else
 197                 cmd->result = DID_ERROR << 16;
 198 out_done:
 199         scsi_done(cmd);
 200         return 0;
 201 }
 202 EXPORT_SYMBOL_GPL(sas_queuecommand);
 203
 204 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
 205 {
 206         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
 207         struct domain_device *dev = cmd_to_domain_dev(cmd);
 208         struct sas_task *task = TO_SAS_TASK(cmd);
 209
 210         /* At this point, we only get called following an actual abort
 211          * of the task, so we should be guaranteed not to be racing with
 212          * any completions from the LLD.  Task is freed after this.
 213          */
 214         sas_end_task(cmd, task);
 215
 216         if (dev_is_sata(dev)) {
 217                 /* defer commands to libata so that libata EH can
 218                  * handle ata qcs correctly
 219                  */
 220                 list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
 221                 return;
 222         }
 223
 224         /* now finish the command and move it on to the error
 225          * handler done list, this also takes it off the
 226          * error handler pending list.
 227          */
 228         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
 229 }
 230
 231 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 232 {
 233         struct scsi_cmnd *cmd, *n;
 234
 235         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 236                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
 237                     cmd->device->lun == my_cmd->device->lun)
 238                         sas_eh_finish_cmd(cmd);
 239         }
 240 }
 241
 242 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 243                                      struct domain_device *dev)
 244 {
 245         struct scsi_cmnd *cmd, *n;
 246
 247         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 248                 struct domain_device *x = cmd_to_domain_dev(cmd);
 249
 250                 if (x == dev)
 251                         sas_eh_finish_cmd(cmd);
 252         }
 253 }
 254
 255 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 256                                       struct asd_sas_port *port)
 257 {
 258         struct scsi_cmnd *cmd, *n;
 259
 260         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 261                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 262                 struct asd_sas_port *x = dev->port;
 263
 264                 if (x == port)
 265                         sas_eh_finish_cmd(cmd);
 266         }
 267 }
 268
 269 enum task_disposition {
 270         TASK_IS_DONE,
 271         TASK_IS_ABORTED,
 272         TASK_IS_AT_LU,
 273         TASK_IS_NOT_AT_LU,
 274         TASK_ABORT_FAILED,
 275 };
 276
 277 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 278 {
 279         unsigned long flags;
 280         int i, res;
 281         struct sas_internal *si =
 282                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 283
 284         for (i = 0; i < 5; i++) {
 285                 pr_notice("%s: aborting task 0x%p\n", __func__, task);
 286                 res = si->dft->lldd_abort_task(task);
 287
 288                 spin_lock_irqsave(&task->task_state_lock, flags);
 289                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 290                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 291                         pr_debug("%s: task 0x%p is done\n", __func__, task);
 292                         return TASK_IS_DONE;
 293                 }
 294                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 295
 296                 if (res == TMF_RESP_FUNC_COMPLETE) {
 297                         pr_notice("%s: task 0x%p is aborted\n",
 298                                   __func__, task);
 299                         return TASK_IS_ABORTED;
 300                 } else if (si->dft->lldd_query_task) {
 301                         pr_notice("%s: querying task 0x%p\n", __func__, task);
 302                         res = si->dft->lldd_query_task(task);
 303                         switch (res) {
 304                         case TMF_RESP_FUNC_SUCC:
 305                                 pr_notice("%s: task 0x%p at LU\n", __func__,
 306                                           task);
 307                                 return TASK_IS_AT_LU;
 308                         case TMF_RESP_FUNC_COMPLETE:
 309                                 pr_notice("%s: task 0x%p not at LU\n",
 310                                           __func__, task);
 311                                 return TASK_IS_NOT_AT_LU;
 312                         case TMF_RESP_FUNC_FAILED:
 313                                 pr_notice("%s: task 0x%p failed to abort\n",
 314                                           __func__, task);
 315                                 return TASK_ABORT_FAILED;
 316                         default:
 317                                 pr_notice("%s: task 0x%p result code %d not handled\n",
 318                                           __func__, task, res);
 319                         }
 320                 }
 321         }
 322         return TASK_ABORT_FAILED;
 323 }
 324
 325 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 326 {
 327         int res = TMF_RESP_FUNC_FAILED;
 328         struct scsi_lun lun;
 329         struct sas_internal *i =
 330                 to_sas_internal(dev->port->ha->core.shost->transportt);
 331
 332         int_to_scsilun(cmd->device->lun, &lun);
 333
 334         pr_notice("eh: device %016llx LUN 0x%llx has the task\n",
 335                   SAS_ADDR(dev->sas_addr),
 336                   cmd->device->lun);
 337
 338         if (i->dft->lldd_abort_task_set)
 339                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 340
 341         if (res == TMF_RESP_FUNC_FAILED) {
 342                 if (i->dft->lldd_clear_task_set)
 343                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 344         }
 345
 346         if (res == TMF_RESP_FUNC_FAILED) {
 347                 if (i->dft->lldd_lu_reset)
 348                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 349         }
 350
 351         return res;
 352 }
 353
 354 static int sas_recover_I_T(struct domain_device *dev)
 355 {
 356         int res = TMF_RESP_FUNC_FAILED;
 357         struct sas_internal *i =
 358                 to_sas_internal(dev->port->ha->core.shost->transportt);
 359
 360         pr_notice("I_T nexus reset for dev %016llx\n",
 361                   SAS_ADDR(dev->sas_addr));
 362
 363         if (i->dft->lldd_I_T_nexus_reset)
 364                 res = i->dft->lldd_I_T_nexus_reset(dev);
 365
 366         return res;
 367 }
 368
 369 /* take a reference on the last known good phy for this device */
 370 struct sas_phy *sas_get_local_phy(struct domain_device *dev)
 371 {
 372         struct sas_ha_struct *ha = dev->port->ha;
 373         struct sas_phy *phy;
 374         unsigned long flags;
 375
 376         /* a published domain device always has a valid phy, it may be
 377          * stale, but it is never NULL
 378          */
 379         BUG_ON(!dev->phy);
 380
 381         spin_lock_irqsave(&ha->phy_port_lock, flags);
 382         phy = dev->phy;
 383         get_device(&phy->dev);
 384         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 385
 386         return phy;
 387 }
 388 EXPORT_SYMBOL_GPL(sas_get_local_phy);
 389
 390 static void sas_wait_eh(struct domain_device *dev)
 391 {
 392         struct sas_ha_struct *ha = dev->port->ha;
 393         DEFINE_WAIT(wait);
 394
 395         if (dev_is_sata(dev)) {
 396                 ata_port_wait_eh(dev->sata_dev.ap);
 397                 return;
 398         }
 399  retry:
 400         spin_lock_irq(&ha->lock);
 401
 402         while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
 403                 prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
 404                 spin_unlock_irq(&ha->lock);
 405                 schedule();
 406                 spin_lock_irq(&ha->lock);
 407         }
 408         finish_wait(&ha->eh_wait_q, &wait);
 409
 410         spin_unlock_irq(&ha->lock);
 411
 412         /* make sure SCSI EH is complete */
 413         if (scsi_host_in_recovery(ha->core.shost)) {
 414                 msleep(10);
 415                 goto retry;
 416         }
 417 }
 418
 419 static int sas_queue_reset(struct domain_device *dev, int reset_type,
 420                            u64 lun, int wait)
 421 {
 422         struct sas_ha_struct *ha = dev->port->ha;
 423         int scheduled = 0, tries = 100;
 424
 425         /* ata: promote lun reset to bus reset */
 426         if (dev_is_sata(dev)) {
 427                 sas_ata_schedule_reset(dev);
 428                 if (wait)
 429                         sas_ata_wait_eh(dev);
 430                 return SUCCESS;
 431         }
 432
 433         while (!scheduled && tries--) {
 434                 spin_lock_irq(&ha->lock);
 435                 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
 436                     !test_bit(reset_type, &dev->state)) {
 437                         scheduled = 1;
 438                         ha->eh_active++;
 439                         list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
 440                         set_bit(SAS_DEV_EH_PENDING, &dev->state);
 441                         set_bit(reset_type, &dev->state);
 442                         int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
 443                         scsi_schedule_eh(ha->core.shost);
 444                 }
 445                 spin_unlock_irq(&ha->lock);
 446
 447                 if (wait)
 448                         sas_wait_eh(dev);
 449
 450                 if (scheduled)
 451                         return SUCCESS;
 452         }
 453
 454         pr_warn("%s reset of %s failed\n",
 455                 reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
 456                 dev_name(&dev->rphy->dev));
 457
 458         return FAILED;
 459 }
 460
 461 int sas_eh_abort_handler(struct scsi_cmnd *cmd)
 462 {
 463         int res = TMF_RESP_FUNC_FAILED;
 464         struct sas_task *task = TO_SAS_TASK(cmd);
 465         struct Scsi_Host *host = cmd->device->host;
 466         struct domain_device *dev = cmd_to_domain_dev(cmd);
 467         struct sas_internal *i = to_sas_internal(host->transportt);
 468         unsigned long flags;
 469
 470         if (!i->dft->lldd_abort_task)
 471                 return FAILED;
 472
 473         spin_lock_irqsave(host->host_lock, flags);
 474         /* We cannot do async aborts for SATA devices */
 475         if (dev_is_sata(dev) && !host->host_eh_scheduled) {
 476                 spin_unlock_irqrestore(host->host_lock, flags);
 477                 return FAILED;
 478         }
 479         spin_unlock_irqrestore(host->host_lock, flags);
 480
 481         if (task)
 482                 res = i->dft->lldd_abort_task(task);
 483         else
 484                 pr_notice("no task to abort\n");
 485         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 486                 return SUCCESS;
 487
 488         return FAILED;
 489 }
 490 EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
 491
 492 /* Attempt to send a LUN reset message to a device */
 493 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 494 {
 495         int res;
 496         struct scsi_lun lun;
 497         struct Scsi_Host *host = cmd->device->host;
 498         struct domain_device *dev = cmd_to_domain_dev(cmd);
 499         struct sas_internal *i = to_sas_internal(host->transportt);
 500
 501         if (current != host->ehandler)
 502                 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
 503
 504         int_to_scsilun(cmd->device->lun, &lun);
 505
 506         if (!i->dft->lldd_lu_reset)
 507                 return FAILED;
 508
 509         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 510         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 511                 return SUCCESS;
 512
 513         return FAILED;
 514 }
 515 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
 516
 517 int sas_eh_target_reset_handler(struct scsi_cmnd *cmd)
 518 {
 519         int res;
 520         struct Scsi_Host *host = cmd->device->host;
 521         struct domain_device *dev = cmd_to_domain_dev(cmd);
 522         struct sas_internal *i = to_sas_internal(host->transportt);
 523
 524         if (current != host->ehandler)
 525                 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
 526
 527         if (!i->dft->lldd_I_T_nexus_reset)
 528                 return FAILED;
 529
 530         res = i->dft->lldd_I_T_nexus_reset(dev);
 531         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
 532             res == -ENODEV)
 533                 return SUCCESS;
 534
 535         return FAILED;
 536 }
 537 EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
 538
 539 /* Try to reset a device */
 540 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
 541 {
 542         int res;
 543         struct Scsi_Host *shost = cmd->device->host;
 544
 545         if (!shost->hostt->eh_device_reset_handler)
 546                 goto try_target_reset;
 547
 548         res = shost->hostt->eh_device_reset_handler(cmd);
 549         if (res == SUCCESS)
 550                 return res;
 551
 552 try_target_reset:
 553         if (shost->hostt->eh_target_reset_handler)
 554                 return shost->hostt->eh_target_reset_handler(cmd);
 555
 556         return FAILED;
 557 }
 558
 559 static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
 560 {
 561         struct scsi_cmnd *cmd, *n;
 562         enum task_disposition res = TASK_IS_DONE;
 563         int tmf_resp, need_reset;
 564         struct sas_internal *i = to_sas_internal(shost->transportt);
 565         unsigned long flags;
 566         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 567         LIST_HEAD(done);
 568
 569         /* clean out any commands that won the completion vs eh race */
 570         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 571                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 572                 struct sas_task *task;
 573
 574                 spin_lock_irqsave(&dev->done_lock, flags);
 575                 /* by this point the lldd has either observed
 576                  * SAS_HA_FROZEN and is leaving the task alone, or has
 577                  * won the race with eh and decided to complete it
 578                  */
 579                 task = TO_SAS_TASK(cmd);
 580                 spin_unlock_irqrestore(&dev->done_lock, flags);
 581
 582                 if (!task)
 583                         list_move_tail(&cmd->eh_entry, &done);
 584         }
 585
 586  Again:
 587         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 588                 struct sas_task *task = TO_SAS_TASK(cmd);
 589
 590                 list_del_init(&cmd->eh_entry);
 591
 592                 spin_lock_irqsave(&task->task_state_lock, flags);
 593                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 594                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 595
 596                 if (need_reset) {
 597                         pr_notice("%s: task 0x%p requests reset\n",
 598                                   __func__, task);
 599                         goto reset;
 600                 }
 601
 602                 pr_debug("trying to find task 0x%p\n", task);
 603                 res = sas_scsi_find_task(task);
 604
 605                 switch (res) {
 606                 case TASK_IS_DONE:
 607                         pr_notice("%s: task 0x%p is done\n", __func__,
 608                                     task);
 609                         sas_eh_finish_cmd(cmd);
 610                         continue;
 611                 case TASK_IS_ABORTED:
 612                         pr_notice("%s: task 0x%p is aborted\n",
 613                                   __func__, task);
 614                         sas_eh_finish_cmd(cmd);
 615                         continue;
 616                 case TASK_IS_AT_LU:
 617                         pr_info("task 0x%p is at LU: lu recover\n", task);
 618  reset:
 619                         tmf_resp = sas_recover_lu(task->dev, cmd);
 620                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 621                                 pr_notice("dev %016llx LU 0x%llx is recovered\n",
 622                                           SAS_ADDR(task->dev),
 623                                           cmd->device->lun);
 624                                 sas_eh_finish_cmd(cmd);
 625                                 sas_scsi_clear_queue_lu(work_q, cmd);
 626                                 goto Again;
 627                         }
 628                         fallthrough;
 629                 case TASK_IS_NOT_AT_LU:
 630                 case TASK_ABORT_FAILED:
 631                         pr_notice("task 0x%p is not at LU: I_T recover\n",
 632                                   task);
 633                         tmf_resp = sas_recover_I_T(task->dev);
 634                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
 635                             tmf_resp == -ENODEV) {
 636                                 struct domain_device *dev = task->dev;
 637                                 pr_notice("I_T %016llx recovered\n",
 638                                           SAS_ADDR(task->dev->sas_addr));
 639                                 sas_eh_finish_cmd(cmd);
 640                                 sas_scsi_clear_queue_I_T(work_q, dev);
 641                                 goto Again;
 642                         }
 643                         /* Hammer time :-) */
 644                         try_to_reset_cmd_device(cmd);
 645                         if (i->dft->lldd_clear_nexus_port) {
 646                                 struct asd_sas_port *port = task->dev->port;
 647                                 pr_debug("clearing nexus for port:%d\n",
 648                                           port->id);
 649                                 res = i->dft->lldd_clear_nexus_port(port);
 650                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 651                                         pr_notice("clear nexus port:%d succeeded\n",
 652                                                   port->id);
 653                                         sas_eh_finish_cmd(cmd);
 654                                         sas_scsi_clear_queue_port(work_q,
 655                                                                   port);
 656                                         goto Again;
 657                                 }
 658                         }
 659                         if (i->dft->lldd_clear_nexus_ha) {
 660                                 pr_debug("clear nexus ha\n");
 661                                 res = i->dft->lldd_clear_nexus_ha(ha);
 662                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 663                                         pr_notice("clear nexus ha succeeded\n");
 664                                         sas_eh_finish_cmd(cmd);
 665                                         goto clear_q;
 666                                 }
 667                         }
 668                         /* If we are here -- this means that no amount
 669                          * of effort could recover from errors.  Quite
 670                          * possibly the HA just disappeared.
 671                          */
 672                         pr_err("error from device %016llx, LUN 0x%llx couldn't be recovered in any way\n",
 673                                SAS_ADDR(task->dev->sas_addr),
 674                                cmd->device->lun);
 675
 676                         sas_eh_finish_cmd(cmd);
 677                         goto clear_q;
 678                 }
 679         }
 680  out:
 681         list_splice_tail(&done, work_q);
 682         list_splice_tail_init(&ha->eh_ata_q, work_q);
 683         return;
 684
 685  clear_q:
 686         pr_debug("--- Exit %s -- clear_q\n", __func__);
 687         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 688                 sas_eh_finish_cmd(cmd);
 689         goto out;
 690 }
 691
 692 static void sas_eh_handle_resets(struct Scsi_Host *shost)
 693 {
 694         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 695         struct sas_internal *i = to_sas_internal(shost->transportt);
 696
 697         /* handle directed resets to sas devices */
 698         spin_lock_irq(&ha->lock);
 699         while (!list_empty(&ha->eh_dev_q)) {
 700                 struct domain_device *dev;
 701                 struct ssp_device *ssp;
 702
 703                 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
 704                 list_del_init(&ssp->eh_list_node);
 705                 dev = container_of(ssp, typeof(*dev), ssp_dev);
 706                 kref_get(&dev->kref);
 707                 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
 708
 709                 spin_unlock_irq(&ha->lock);
 710
 711                 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
 712                         i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
 713
 714                 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
 715                         i->dft->lldd_I_T_nexus_reset(dev);
 716
 717                 sas_put_device(dev);
 718                 spin_lock_irq(&ha->lock);
 719                 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
 720                 ha->eh_active--;
 721         }
 722         spin_unlock_irq(&ha->lock);
 723 }
 724
 725
 726 void sas_scsi_recover_host(struct Scsi_Host *shost)
 727 {
 728         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 729         LIST_HEAD(eh_work_q);
 730         int tries = 0;
 731         bool retry;
 732
 733 retry:
 734         tries++;
 735         retry = true;
 736         spin_lock_irq(shost->host_lock);
 737         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 738         spin_unlock_irq(shost->host_lock);
 739
 740         pr_notice("Enter %s busy: %d failed: %d\n",
 741                   __func__, scsi_host_busy(shost), shost->host_failed);
 742         /*
 743          * Deal with commands that still have SAS tasks (i.e. they didn't
 744          * complete via the normal sas_task completion mechanism),
 745          * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
 746          */
 747         set_bit(SAS_HA_FROZEN, &ha->state);
 748         sas_eh_handle_sas_errors(shost, &eh_work_q);
 749         clear_bit(SAS_HA_FROZEN, &ha->state);
 750         if (list_empty(&eh_work_q))
 751                 goto out;
 752
 753         /*
 754          * Now deal with SCSI commands that completed ok but have a an error
 755          * code (and hopefully sense data) attached.  This is roughly what
 756          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 757          * command we see here has no sas_task and is thus unknown to the HA.
 758          */
 759         sas_ata_eh(shost, &eh_work_q);
 760         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 761                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 762
 763 out:
 764         sas_eh_handle_resets(shost);
 765
 766         /* now link into libata eh --- if we have any ata devices */
 767         sas_ata_strategy_handler(shost);
 768
 769         scsi_eh_flush_done_q(&ha->eh_done_q);
 770
 771         /* check if any new eh work was scheduled during the last run */
 772         spin_lock_irq(&ha->lock);
 773         if (ha->eh_active == 0) {
 774                 shost->host_eh_scheduled = 0;
 775                 retry = false;
 776         }
 777         spin_unlock_irq(&ha->lock);
 778
 779         if (retry)
 780                 goto retry;
 781
 782         pr_notice("--- Exit %s: busy: %d failed: %d tries: %d\n",
 783                   __func__, scsi_host_busy(shost),
 784                   shost->host_failed, tries);
 785 }
 786
 787 int sas_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg)
 788 {
 789         struct domain_device *dev = sdev_to_domain_dev(sdev);
 790
 791         if (dev_is_sata(dev))
 792                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
 793
 794         return -EINVAL;
 795 }
 796 EXPORT_SYMBOL_GPL(sas_ioctl);
 797
 798 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 799 {
 800         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 801         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 802         struct domain_device *found_dev = NULL;
 803         int i;
 804         unsigned long flags;
 805
 806         spin_lock_irqsave(&ha->phy_port_lock, flags);
 807         for (i = 0; i < ha->num_phys; i++) {
 808                 struct asd_sas_port *port = ha->sas_port[i];
 809                 struct domain_device *dev;
 810
 811                 spin_lock(&port->dev_list_lock);
 812                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 813                         if (rphy == dev->rphy) {
 814                                 found_dev = dev;
 815                                 spin_unlock(&port->dev_list_lock);
 816                                 goto found;
 817                         }
 818                 }
 819                 spin_unlock(&port->dev_list_lock);
 820         }
 821  found:
 822         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 823
 824         return found_dev;
 825 }
 826
 827 int sas_target_alloc(struct scsi_target *starget)
 828 {
 829         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 830         struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
 831
 832         if (!found_dev)
 833                 return -ENODEV;
 834
 835         kref_get(&found_dev->kref);
 836         starget->hostdata = found_dev;
 837         return 0;
 838 }
 839 EXPORT_SYMBOL_GPL(sas_target_alloc);
 840
 841 #define SAS_DEF_QD 256
 842
 843 int sas_slave_configure(struct scsi_device *scsi_dev)
 844 {
 845         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 846
 847         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 848
 849         if (dev_is_sata(dev)) {
 850                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 851                 return 0;
 852         }
 853
 854         sas_read_port_mode_page(scsi_dev);
 855
 856         if (scsi_dev->tagged_supported) {
 857                 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
 858         } else {
 859                 pr_notice("device %016llx, LUN 0x%llx doesn't support TCQ\n",
 860                           SAS_ADDR(dev->sas_addr), scsi_dev->lun);
 861                 scsi_change_queue_depth(scsi_dev, 1);
 862         }
 863
 864         scsi_dev->allow_restart = 1;
 865
 866         return 0;
 867 }
 868 EXPORT_SYMBOL_GPL(sas_slave_configure);
 869
 870 int sas_change_queue_depth(struct scsi_device *sdev, int depth)
 871 {
 872         struct domain_device *dev = sdev_to_domain_dev(sdev);
 873
 874         if (dev_is_sata(dev))
 875                 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
 876
 877         if (!sdev->tagged_supported)
 878                 depth = 1;
 879         return scsi_change_queue_depth(sdev, depth);
 880 }
 881 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
 882
 883 int sas_bios_param(struct scsi_device *scsi_dev,
 884                           struct block_device *bdev,
 885                           sector_t capacity, int *hsc)
 886 {
 887         hsc[0] = 255;
 888         hsc[1] = 63;
 889         sector_div(capacity, 255*63);
 890         hsc[2] = capacity;
 891
 892         return 0;
 893 }
 894 EXPORT_SYMBOL_GPL(sas_bios_param);
 895
 896 void sas_task_internal_done(struct sas_task *task)
 897 {
 898         del_timer(&task->slow_task->timer);
 899         complete(&task->slow_task->completion);
 900 }
 901
 902 void sas_task_internal_timedout(struct timer_list *t)
 903 {
 904         struct sas_task_slow *slow = from_timer(slow, t, timer);
 905         struct sas_task *task = slow->task;
 906         bool is_completed = true;
 907         unsigned long flags;
 908
 909         spin_lock_irqsave(&task->task_state_lock, flags);
 910         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
 911                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 912                 is_completed = false;
 913         }
 914         spin_unlock_irqrestore(&task->task_state_lock, flags);
 915
 916         if (!is_completed)
 917                 complete(&task->slow_task->completion);
 918 }
 919
 920 #define TASK_TIMEOUT                    (20 * HZ)
 921 #define TASK_RETRY                      3
 922
 923 static int sas_execute_internal_abort(struct domain_device *device,
 924                                       enum sas_internal_abort type, u16 tag,
 925                                       unsigned int qid, void *data)
 926 {
 927         struct sas_ha_struct *ha = device->port->ha;
 928         struct sas_internal *i = to_sas_internal(ha->core.shost->transportt);
 929         struct sas_task *task = NULL;
 930         int res, retry;
 931
 932         for (retry = 0; retry < TASK_RETRY; retry++) {
 933                 task = sas_alloc_slow_task(GFP_KERNEL);
 934                 if (!task)
 935                         return -ENOMEM;
 936
 937                 task->dev = device;
 938                 task->task_proto = SAS_PROTOCOL_INTERNAL_ABORT;
 939                 task->task_done = sas_task_internal_done;
 940                 task->slow_task->timer.function = sas_task_internal_timedout;
 941                 task->slow_task->timer.expires = jiffies + TASK_TIMEOUT;
 942                 add_timer(&task->slow_task->timer);
 943
 944                 task->abort_task.tag = tag;
 945                 task->abort_task.type = type;
 946                 task->abort_task.qid = qid;
 947
 948                 res = i->dft->lldd_execute_task(task, GFP_KERNEL);
 949                 if (res) {
 950                         del_timer_sync(&task->slow_task->timer);
 951                         pr_err("Executing internal abort failed %016llx (%d)\n",
 952                                SAS_ADDR(device->sas_addr), res);
 953                         break;
 954                 }
 955
 956                 wait_for_completion(&task->slow_task->completion);
 957                 res = TMF_RESP_FUNC_FAILED;
 958
 959                 /* Even if the internal abort timed out, return direct. */
 960                 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 961                         bool quit = true;
 962
 963                         if (i->dft->lldd_abort_timeout)
 964                                 quit = i->dft->lldd_abort_timeout(task, data);
 965                         else
 966                                 pr_err("Internal abort: timeout %016llx\n",
 967                                        SAS_ADDR(device->sas_addr));
 968                         res = -EIO;
 969                         if (quit)
 970                                 break;
 971                 }
 972
 973                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
 974                         task->task_status.stat == SAS_SAM_STAT_GOOD) {
 975                         res = TMF_RESP_FUNC_COMPLETE;
 976                         break;
 977                 }
 978
 979                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
 980                         task->task_status.stat == TMF_RESP_FUNC_SUCC) {
 981                         res = TMF_RESP_FUNC_SUCC;
 982                         break;
 983                 }
 984
 985                 pr_err("Internal abort: task to dev %016llx response: 0x%x status 0x%x\n",
 986                        SAS_ADDR(device->sas_addr), task->task_status.resp,
 987                        task->task_status.stat);
 988                 sas_free_task(task);
 989                 task = NULL;
 990         }
 991         BUG_ON(retry == TASK_RETRY && task != NULL);
 992         sas_free_task(task);
 993         return res;
 994 }
 995
 996 int sas_execute_internal_abort_single(struct domain_device *device, u16 tag,
 997                                       unsigned int qid, void *data)
 998 {
 999         return sas_execute_internal_abort(device, SAS_INTERNAL_ABORT_SINGLE,
1000                                           tag, qid, data);
1001 }
1002 EXPORT_SYMBOL_GPL(sas_execute_internal_abort_single);
1003
1004 int sas_execute_internal_abort_dev(struct domain_device *device,
1005                                    unsigned int qid, void *data)
1006 {
1007         return sas_execute_internal_abort(device, SAS_INTERNAL_ABORT_DEV,
1008                                           SCSI_NO_TAG, qid, data);
1009 }
1010 EXPORT_SYMBOL_GPL(sas_execute_internal_abort_dev);
1011
1012 int sas_execute_tmf(struct domain_device *device, void *parameter,
1013                     int para_len, int force_phy_id,
1014                     struct sas_tmf_task *tmf)
1015 {
1016         struct sas_task *task;
1017         struct sas_internal *i =
1018                 to_sas_internal(device->port->ha->core.shost->transportt);
1019         int res, retry;
1020
1021         for (retry = 0; retry < TASK_RETRY; retry++) {
1022                 task = sas_alloc_slow_task(GFP_KERNEL);
1023                 if (!task)
1024                         return -ENOMEM;
1025
1026                 task->dev = device;
1027                 task->task_proto = device->tproto;
1028
1029                 if (dev_is_sata(device)) {
1030                         task->ata_task.device_control_reg_update = 1;
1031                         if (force_phy_id >= 0) {
1032                                 task->ata_task.force_phy = true;
1033                                 task->ata_task.force_phy_id = force_phy_id;
1034                         }
1035                         memcpy(&task->ata_task.fis, parameter, para_len);
1036                 } else {
1037                         memcpy(&task->ssp_task, parameter, para_len);
1038                 }
1039
1040                 task->task_done = sas_task_internal_done;
1041                 task->tmf = tmf;
1042
1043                 task->slow_task->timer.function = sas_task_internal_timedout;
1044                 task->slow_task->timer.expires = jiffies + TASK_TIMEOUT;
1045                 add_timer(&task->slow_task->timer);
1046
1047                 res = i->dft->lldd_execute_task(task, GFP_KERNEL);
1048                 if (res) {
1049                         del_timer_sync(&task->slow_task->timer);
1050                         pr_err("executing TMF task failed %016llx (%d)\n",
1051                                SAS_ADDR(device->sas_addr), res);
1052                         break;
1053                 }
1054
1055                 wait_for_completion(&task->slow_task->completion);
1056
1057                 if (i->dft->lldd_tmf_exec_complete)
1058                         i->dft->lldd_tmf_exec_complete(device);
1059
1060                 res = TMF_RESP_FUNC_FAILED;
1061
1062                 if ((task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
1063                         if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) {
1064                                 pr_err("TMF task timeout for %016llx and not done\n",
1065                                        SAS_ADDR(device->sas_addr));
1066                                 if (i->dft->lldd_tmf_aborted)
1067                                         i->dft->lldd_tmf_aborted(task);
1068                                 break;
1069                         }
1070                         pr_warn("TMF task timeout for %016llx and done\n",
1071                                 SAS_ADDR(device->sas_addr));
1072                 }
1073
1074                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1075                     task->task_status.stat == TMF_RESP_FUNC_COMPLETE) {
1076                         res = TMF_RESP_FUNC_COMPLETE;
1077                         break;
1078                 }
1079
1080                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1081                     task->task_status.stat == TMF_RESP_FUNC_SUCC) {
1082                         res = TMF_RESP_FUNC_SUCC;
1083                         break;
1084                 }
1085
1086                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1087                     task->task_status.stat == SAS_DATA_UNDERRUN) {
1088                         /* no error, but return the number of bytes of
1089                          * underrun
1090                          */
1091                         pr_warn("TMF task to dev %016llx resp: 0x%x sts 0x%x underrun\n",
1092                                 SAS_ADDR(device->sas_addr),
1093                                 task->task_status.resp,
1094                                 task->task_status.stat);
1095                         res = task->task_status.residual;
1096                         break;
1097                 }
1098
1099                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1100                     task->task_status.stat == SAS_DATA_OVERRUN) {
1101                         pr_warn("TMF task blocked task error %016llx\n",
1102                                 SAS_ADDR(device->sas_addr));
1103                         res = -EMSGSIZE;
1104                         break;
1105                 }
1106
1107                 if (task->task_status.resp == SAS_TASK_COMPLETE &&
1108                     task->task_status.stat == SAS_OPEN_REJECT) {
1109                         pr_warn("TMF task open reject failed  %016llx\n",
1110                                 SAS_ADDR(device->sas_addr));
1111                         res = -EIO;
1112                 } else {
1113                         pr_warn("TMF task to dev %016llx resp: 0x%x status 0x%x\n",
1114                                 SAS_ADDR(device->sas_addr),
1115                                 task->task_status.resp,
1116                                 task->task_status.stat);
1117                 }
1118                 sas_free_task(task);
1119                 task = NULL;
1120         }
1121
1122         if (retry == TASK_RETRY)
1123                 pr_warn("executing TMF for %016llx failed after %d attempts!\n",
1124                         SAS_ADDR(device->sas_addr), TASK_RETRY);
1125         sas_free_task(task);
1126
1127         return res;
1128 }
1129
1130 static int sas_execute_ssp_tmf(struct domain_device *device, u8 *lun,
1131                                struct sas_tmf_task *tmf)
1132 {
1133         struct sas_ssp_task ssp_task;
1134
1135         if (!(device->tproto & SAS_PROTOCOL_SSP))
1136                 return TMF_RESP_FUNC_ESUPP;
1137
1138         memcpy(ssp_task.LUN, lun, 8);
1139
1140         return sas_execute_tmf(device, &ssp_task, sizeof(ssp_task), -1, tmf);
1141 }
1142
1143 int sas_abort_task_set(struct domain_device *dev, u8 *lun)
1144 {
1145         struct sas_tmf_task tmf_task = {
1146                 .tmf = TMF_ABORT_TASK_SET,
1147         };
1148
1149         return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1150 }
1151 EXPORT_SYMBOL_GPL(sas_abort_task_set);
1152
1153 int sas_clear_task_set(struct domain_device *dev, u8 *lun)
1154 {
1155         struct sas_tmf_task tmf_task = {
1156                 .tmf = TMF_CLEAR_TASK_SET,
1157         };
1158
1159         return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1160 }
1161 EXPORT_SYMBOL_GPL(sas_clear_task_set);
1162
1163 int sas_lu_reset(struct domain_device *dev, u8 *lun)
1164 {
1165         struct sas_tmf_task tmf_task = {
1166                 .tmf = TMF_LU_RESET,
1167         };
1168
1169         return sas_execute_ssp_tmf(dev, lun, &tmf_task);
1170 }
1171 EXPORT_SYMBOL_GPL(sas_lu_reset);
1172
1173 int sas_query_task(struct sas_task *task, u16 tag)
1174 {
1175         struct sas_tmf_task tmf_task = {
1176                 .tmf = TMF_QUERY_TASK,
1177                 .tag_of_task_to_be_managed = tag,
1178         };
1179         struct scsi_cmnd *cmnd = task->uldd_task;
1180         struct domain_device *dev = task->dev;
1181         struct scsi_lun lun;
1182
1183         int_to_scsilun(cmnd->device->lun, &lun);
1184
1185         return sas_execute_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
1186 }
1187 EXPORT_SYMBOL_GPL(sas_query_task);
1188
1189 int sas_abort_task(struct sas_task *task, u16 tag)
1190 {
1191         struct sas_tmf_task tmf_task = {
1192                 .tmf = TMF_ABORT_TASK,
1193                 .tag_of_task_to_be_managed = tag,
1194         };
1195         struct scsi_cmnd *cmnd = task->uldd_task;
1196         struct domain_device *dev = task->dev;
1197         struct scsi_lun lun;
1198
1199         int_to_scsilun(cmnd->device->lun, &lun);
1200
1201         return sas_execute_ssp_tmf(dev, lun.scsi_lun, &tmf_task);
1202 }
1203 EXPORT_SYMBOL_GPL(sas_abort_task);
1204
1205 /*
1206  * Tell an upper layer that it needs to initiate an abort for a given task.
1207  * This should only ever be called by an LLDD.
1208  */
1209 void sas_task_abort(struct sas_task *task)
1210 {
1211         struct scsi_cmnd *sc = task->uldd_task;
1212
1213         /* Escape for libsas internal commands */
1214         if (!sc) {
1215                 struct sas_task_slow *slow = task->slow_task;
1216
1217                 if (!slow)
1218                         return;
1219                 if (!del_timer(&slow->timer))
1220                         return;
1221                 slow->timer.function(&slow->timer);
1222                 return;
1223         }
1224
1225         if (dev_is_sata(task->dev))
1226                 sas_ata_task_abort(task);
1227         else
1228                 blk_abort_request(scsi_cmd_to_rq(sc));
1229 }
1230 EXPORT_SYMBOL_GPL(sas_task_abort);
1231
1232 int sas_slave_alloc(struct scsi_device *sdev)
1233 {
1234         if (dev_is_sata(sdev_to_domain_dev(sdev)) && sdev->lun)
1235                 return -ENXIO;
1236
1237         return 0;
1238 }
1239 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1240
1241 void sas_target_destroy(struct scsi_target *starget)
1242 {
1243         struct domain_device *found_dev = starget->hostdata;
1244
1245         if (!found_dev)
1246                 return;
1247
1248         starget->hostdata = NULL;
1249         sas_put_device(found_dev);
1250 }
1251 EXPORT_SYMBOL_GPL(sas_target_destroy);
1252
1253 #define SAS_STRING_ADDR_SIZE    16
1254
1255 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1256 {
1257         int res;
1258         const struct firmware *fw;
1259
1260         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1261         if (res)
1262                 return res;
1263
1264         if (fw->size < SAS_STRING_ADDR_SIZE) {
1265                 res = -ENODEV;
1266                 goto out;
1267         }
1268
1269         res = hex2bin(addr, fw->data, strnlen(fw->data, SAS_ADDR_SIZE * 2) / 2);
1270         if (res)
1271                 goto out;
1272
1273 out:
1274         release_firmware(fw);
1275         return res;
1276 }
1277 EXPORT_SYMBOL_GPL(sas_request_addr);
1278