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