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         int hs = 0, stat = 0;
  41
  42         if (ts->resp == SAS_TASK_UNDELIVERED) {
  43                 /* transport error */
  44                 hs = DID_NO_CONNECT;
  45         } else { /* ts->resp == SAS_TASK_COMPLETE */
  46                 /* task delivered, what happened afterwards? */
  47                 switch (ts->stat) {
  48                 case SAS_DEV_NO_RESPONSE:
  49                 case SAS_INTERRUPTED:
  50                 case SAS_PHY_DOWN:
  51                 case SAS_NAK_R_ERR:
  52                 case SAS_OPEN_TO:
  53                         hs = DID_NO_CONNECT;
  54                         break;
  55                 case SAS_DATA_UNDERRUN:
  56                         scsi_set_resid(sc, ts->residual);
  57                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  58                                 hs = DID_ERROR;
  59                         break;
  60                 case SAS_DATA_OVERRUN:
  61                         hs = DID_ERROR;
  62                         break;
  63                 case SAS_QUEUE_FULL:
  64                         hs = DID_SOFT_ERROR; /* retry */
  65                         break;
  66                 case SAS_DEVICE_UNKNOWN:
  67                         hs = DID_BAD_TARGET;
  68                         break;
  69                 case SAS_SG_ERR:
  70                         hs = DID_PARITY;
  71                         break;
  72                 case SAS_OPEN_REJECT:
  73                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
  74                                 hs = DID_SOFT_ERROR; /* retry */
  75                         else
  76                                 hs = DID_ERROR;
  77                         break;
  78                 case SAS_PROTO_RESPONSE:
  79                         pr_notice("LLDD:%s sent SAS_PROTO_RESP for an SSP task; please report this\n",
  80                                   task->dev->port->ha->sas_ha_name);
  81                         break;
  82                 case SAS_ABORTED_TASK:
  83                         hs = DID_ABORT;
  84                         break;
  85                 case SAM_STAT_CHECK_CONDITION:
  86                         memcpy(sc->sense_buffer, ts->buf,
  87                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
  88                         stat = SAM_STAT_CHECK_CONDITION;
  89                         break;
  90                 default:
  91                         stat = ts->stat;
  92                         break;
  93                 }
  94         }
  95
  96         sc->result = (hs << 16) | stat;
  97         ASSIGN_SAS_TASK(sc, NULL);
  98         sas_free_task(task);
  99 }
 100
 101 static void sas_scsi_task_done(struct sas_task *task)
 102 {
 103         struct scsi_cmnd *sc = task->uldd_task;
 104         struct domain_device *dev = task->dev;
 105         struct sas_ha_struct *ha = dev->port->ha;
 106         unsigned long flags;
 107
 108         spin_lock_irqsave(&dev->done_lock, flags);
 109         if (test_bit(SAS_HA_FROZEN, &ha->state))
 110                 task = NULL;
 111         else
 112                 ASSIGN_SAS_TASK(sc, NULL);
 113         spin_unlock_irqrestore(&dev->done_lock, flags);
 114
 115         if (unlikely(!task)) {
 116                 /* task will be completed by the error handler */
 117                 pr_debug("task done but aborted\n");
 118                 return;
 119         }
 120
 121         if (unlikely(!sc)) {
 122                 pr_debug("task_done called with non existing SCSI cmnd!\n");
 123                 sas_free_task(task);
 124                 return;
 125         }
 126
 127         sas_end_task(sc, task);
 128         sc->scsi_done(sc);
 129 }
 130
 131 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 132                                                struct domain_device *dev,
 133                                                gfp_t gfp_flags)
 134 {
 135         struct sas_task *task = sas_alloc_task(gfp_flags);
 136         struct scsi_lun lun;
 137
 138         if (!task)
 139                 return NULL;
 140
 141         task->uldd_task = cmd;
 142         ASSIGN_SAS_TASK(cmd, task);
 143
 144         task->dev = dev;
 145         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 146
 147         task->ssp_task.retry_count = 1;
 148         int_to_scsilun(cmd->device->lun, &lun);
 149         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 150         task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
 151         task->ssp_task.cmd = cmd;
 152
 153         task->scatter = scsi_sglist(cmd);
 154         task->num_scatter = scsi_sg_count(cmd);
 155         task->total_xfer_len = scsi_bufflen(cmd);
 156         task->data_dir = cmd->sc_data_direction;
 157
 158         task->task_done = sas_scsi_task_done;
 159
 160         return task;
 161 }
 162
 163 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 164 {
 165         struct sas_internal *i = to_sas_internal(host->transportt);
 166         struct domain_device *dev = cmd_to_domain_dev(cmd);
 167         struct sas_task *task;
 168         int res = 0;
 169
 170         /* If the device fell off, no sense in issuing commands */
 171         if (test_bit(SAS_DEV_GONE, &dev->state)) {
 172                 cmd->result = DID_BAD_TARGET << 16;
 173                 goto out_done;
 174         }
 175
 176         if (dev_is_sata(dev)) {
 177                 spin_lock_irq(dev->sata_dev.ap->lock);
 178                 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
 179                 spin_unlock_irq(dev->sata_dev.ap->lock);
 180                 return res;
 181         }
 182
 183         task = sas_create_task(cmd, dev, GFP_ATOMIC);
 184         if (!task)
 185                 return SCSI_MLQUEUE_HOST_BUSY;
 186
 187         res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
 188         if (res)
 189                 goto out_free_task;
 190         return 0;
 191
 192 out_free_task:
 193         pr_debug("lldd_execute_task returned: %d\n", res);
 194         ASSIGN_SAS_TASK(cmd, NULL);
 195         sas_free_task(task);
 196         if (res == -SAS_QUEUE_FULL)
 197                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 198         else
 199                 cmd->result = DID_ERROR << 16;
 200 out_done:
 201         cmd->scsi_done(cmd);
 202         return 0;
 203 }
 204
 205 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
 206 {
 207         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
 208         struct domain_device *dev = cmd_to_domain_dev(cmd);
 209         struct sas_task *task = TO_SAS_TASK(cmd);
 210
 211         /* At this point, we only get called following an actual abort
 212          * of the task, so we should be guaranteed not to be racing with
 213          * any completions from the LLD.  Task is freed after this.
 214          */
 215         sas_end_task(cmd, task);
 216
 217         if (dev_is_sata(dev)) {
 218                 /* defer commands to libata so that libata EH can
 219                  * handle ata qcs correctly
 220                  */
 221                 list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
 222                 return;
 223         }
 224
 225         /* now finish the command and move it on to the error
 226          * handler done list, this also takes it off the
 227          * error handler pending list.
 228          */
 229         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
 230 }
 231
 232 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 233 {
 234         struct scsi_cmnd *cmd, *n;
 235
 236         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 237                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
 238                     cmd->device->lun == my_cmd->device->lun)
 239                         sas_eh_finish_cmd(cmd);
 240         }
 241 }
 242
 243 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 244                                      struct domain_device *dev)
 245 {
 246         struct scsi_cmnd *cmd, *n;
 247
 248         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 249                 struct domain_device *x = cmd_to_domain_dev(cmd);
 250
 251                 if (x == dev)
 252                         sas_eh_finish_cmd(cmd);
 253         }
 254 }
 255
 256 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 257                                       struct asd_sas_port *port)
 258 {
 259         struct scsi_cmnd *cmd, *n;
 260
 261         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 262                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 263                 struct asd_sas_port *x = dev->port;
 264
 265                 if (x == port)
 266                         sas_eh_finish_cmd(cmd);
 267         }
 268 }
 269
 270 enum task_disposition {
 271         TASK_IS_DONE,
 272         TASK_IS_ABORTED,
 273         TASK_IS_AT_LU,
 274         TASK_IS_NOT_AT_LU,
 275         TASK_ABORT_FAILED,
 276 };
 277
 278 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 279 {
 280         unsigned long flags;
 281         int i, res;
 282         struct sas_internal *si =
 283                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 284
 285         for (i = 0; i < 5; i++) {
 286                 pr_notice("%s: aborting task 0x%p\n", __func__, task);
 287                 res = si->dft->lldd_abort_task(task);
 288
 289                 spin_lock_irqsave(&task->task_state_lock, flags);
 290                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 291                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 292                         pr_debug("%s: task 0x%p is done\n", __func__, task);
 293                         return TASK_IS_DONE;
 294                 }
 295                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 296
 297                 if (res == TMF_RESP_FUNC_COMPLETE) {
 298                         pr_notice("%s: task 0x%p is aborted\n",
 299                                   __func__, task);
 300                         return TASK_IS_ABORTED;
 301                 } else if (si->dft->lldd_query_task) {
 302                         pr_notice("%s: querying task 0x%p\n", __func__, task);
 303                         res = si->dft->lldd_query_task(task);
 304                         switch (res) {
 305                         case TMF_RESP_FUNC_SUCC:
 306                                 pr_notice("%s: task 0x%p at LU\n", __func__,
 307                                           task);
 308                                 return TASK_IS_AT_LU;
 309                         case TMF_RESP_FUNC_COMPLETE:
 310                                 pr_notice("%s: task 0x%p not at LU\n",
 311                                           __func__, task);
 312                                 return TASK_IS_NOT_AT_LU;
 313                         case TMF_RESP_FUNC_FAILED:
 314                                 pr_notice("%s: task 0x%p failed to abort\n",
 315                                           __func__, task);
 316                                 return TASK_ABORT_FAILED;
 317                         }
 318
 319                 }
 320         }
 321         return res;
 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->core.shost->transportt);
 330
 331         int_to_scsilun(cmd->device->lun, &lun);
 332
 333         pr_notice("eh: device %llx LUN %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->core.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 void sas_wait_eh(struct domain_device *dev)
 390 {
 391         struct sas_ha_struct *ha = dev->port->ha;
 392         DEFINE_WAIT(wait);
 393
 394         if (dev_is_sata(dev)) {
 395                 ata_port_wait_eh(dev->sata_dev.ap);
 396                 return;
 397         }
 398  retry:
 399         spin_lock_irq(&ha->lock);
 400
 401         while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
 402                 prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
 403                 spin_unlock_irq(&ha->lock);
 404                 schedule();
 405                 spin_lock_irq(&ha->lock);
 406         }
 407         finish_wait(&ha->eh_wait_q, &wait);
 408
 409         spin_unlock_irq(&ha->lock);
 410
 411         /* make sure SCSI EH is complete */
 412         if (scsi_host_in_recovery(ha->core.shost)) {
 413                 msleep(10);
 414                 goto retry;
 415         }
 416 }
 417 EXPORT_SYMBOL(sas_wait_eh);
 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
 516 int sas_eh_target_reset_handler(struct scsi_cmnd *cmd)
 517 {
 518         int res;
 519         struct Scsi_Host *host = cmd->device->host;
 520         struct domain_device *dev = cmd_to_domain_dev(cmd);
 521         struct sas_internal *i = to_sas_internal(host->transportt);
 522
 523         if (current != host->ehandler)
 524                 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
 525
 526         if (!i->dft->lldd_I_T_nexus_reset)
 527                 return FAILED;
 528
 529         res = i->dft->lldd_I_T_nexus_reset(dev);
 530         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
 531             res == -ENODEV)
 532                 return SUCCESS;
 533
 534         return FAILED;
 535 }
 536
 537 /* Try to reset a device */
 538 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
 539 {
 540         int res;
 541         struct Scsi_Host *shost = cmd->device->host;
 542
 543         if (!shost->hostt->eh_device_reset_handler)
 544                 goto try_target_reset;
 545
 546         res = shost->hostt->eh_device_reset_handler(cmd);
 547         if (res == SUCCESS)
 548                 return res;
 549
 550 try_target_reset:
 551         if (shost->hostt->eh_target_reset_handler)
 552                 return shost->hostt->eh_target_reset_handler(cmd);
 553
 554         return FAILED;
 555 }
 556
 557 static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
 558 {
 559         struct scsi_cmnd *cmd, *n;
 560         enum task_disposition res = TASK_IS_DONE;
 561         int tmf_resp, need_reset;
 562         struct sas_internal *i = to_sas_internal(shost->transportt);
 563         unsigned long flags;
 564         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 565         LIST_HEAD(done);
 566
 567         /* clean out any commands that won the completion vs eh race */
 568         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 569                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 570                 struct sas_task *task;
 571
 572                 spin_lock_irqsave(&dev->done_lock, flags);
 573                 /* by this point the lldd has either observed
 574                  * SAS_HA_FROZEN and is leaving the task alone, or has
 575                  * won the race with eh and decided to complete it
 576                  */
 577                 task = TO_SAS_TASK(cmd);
 578                 spin_unlock_irqrestore(&dev->done_lock, flags);
 579
 580                 if (!task)
 581                         list_move_tail(&cmd->eh_entry, &done);
 582         }
 583
 584  Again:
 585         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 586                 struct sas_task *task = TO_SAS_TASK(cmd);
 587
 588                 list_del_init(&cmd->eh_entry);
 589
 590                 spin_lock_irqsave(&task->task_state_lock, flags);
 591                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 592                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 593
 594                 if (need_reset) {
 595                         pr_notice("%s: task 0x%p requests reset\n",
 596                                   __func__, task);
 597                         goto reset;
 598                 }
 599
 600                 pr_debug("trying to find task 0x%p\n", task);
 601                 res = sas_scsi_find_task(task);
 602
 603                 switch (res) {
 604                 case TASK_IS_DONE:
 605                         pr_notice("%s: task 0x%p is done\n", __func__,
 606                                     task);
 607                         sas_eh_finish_cmd(cmd);
 608                         continue;
 609                 case TASK_IS_ABORTED:
 610                         pr_notice("%s: task 0x%p is aborted\n",
 611                                   __func__, task);
 612                         sas_eh_finish_cmd(cmd);
 613                         continue;
 614                 case TASK_IS_AT_LU:
 615                         pr_info("task 0x%p is at LU: lu recover\n", task);
 616  reset:
 617                         tmf_resp = sas_recover_lu(task->dev, cmd);
 618                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 619                                 pr_notice("dev %016llx LU %llx is recovered\n",
 620                                           SAS_ADDR(task->dev),
 621                                           cmd->device->lun);
 622                                 sas_eh_finish_cmd(cmd);
 623                                 sas_scsi_clear_queue_lu(work_q, cmd);
 624                                 goto Again;
 625                         }
 626                         /* fallthrough */
 627                 case TASK_IS_NOT_AT_LU:
 628                 case TASK_ABORT_FAILED:
 629                         pr_notice("task 0x%p is not at LU: I_T recover\n",
 630                                   task);
 631                         tmf_resp = sas_recover_I_T(task->dev);
 632                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
 633                             tmf_resp == -ENODEV) {
 634                                 struct domain_device *dev = task->dev;
 635                                 pr_notice("I_T %016llx recovered\n",
 636                                           SAS_ADDR(task->dev->sas_addr));
 637                                 sas_eh_finish_cmd(cmd);
 638                                 sas_scsi_clear_queue_I_T(work_q, dev);
 639                                 goto Again;
 640                         }
 641                         /* Hammer time :-) */
 642                         try_to_reset_cmd_device(cmd);
 643                         if (i->dft->lldd_clear_nexus_port) {
 644                                 struct asd_sas_port *port = task->dev->port;
 645                                 pr_debug("clearing nexus for port:%d\n",
 646                                           port->id);
 647                                 res = i->dft->lldd_clear_nexus_port(port);
 648                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 649                                         pr_notice("clear nexus port:%d succeeded\n",
 650                                                   port->id);
 651                                         sas_eh_finish_cmd(cmd);
 652                                         sas_scsi_clear_queue_port(work_q,
 653                                                                   port);
 654                                         goto Again;
 655                                 }
 656                         }
 657                         if (i->dft->lldd_clear_nexus_ha) {
 658                                 pr_debug("clear nexus ha\n");
 659                                 res = i->dft->lldd_clear_nexus_ha(ha);
 660                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 661                                         pr_notice("clear nexus ha succeeded\n");
 662                                         sas_eh_finish_cmd(cmd);
 663                                         goto clear_q;
 664                                 }
 665                         }
 666                         /* If we are here -- this means that no amount
 667                          * of effort could recover from errors.  Quite
 668                          * possibly the HA just disappeared.
 669                          */
 670                         pr_err("error from  device %llx, LUN %llx couldn't be recovered in any way\n",
 671                                SAS_ADDR(task->dev->sas_addr),
 672                                cmd->device->lun);
 673
 674                         sas_eh_finish_cmd(cmd);
 675                         goto clear_q;
 676                 }
 677         }
 678  out:
 679         list_splice_tail(&done, work_q);
 680         list_splice_tail_init(&ha->eh_ata_q, work_q);
 681         return;
 682
 683  clear_q:
 684         pr_debug("--- Exit %s -- clear_q\n", __func__);
 685         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 686                 sas_eh_finish_cmd(cmd);
 687         goto out;
 688 }
 689
 690 static void sas_eh_handle_resets(struct Scsi_Host *shost)
 691 {
 692         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 693         struct sas_internal *i = to_sas_internal(shost->transportt);
 694
 695         /* handle directed resets to sas devices */
 696         spin_lock_irq(&ha->lock);
 697         while (!list_empty(&ha->eh_dev_q)) {
 698                 struct domain_device *dev;
 699                 struct ssp_device *ssp;
 700
 701                 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
 702                 list_del_init(&ssp->eh_list_node);
 703                 dev = container_of(ssp, typeof(*dev), ssp_dev);
 704                 kref_get(&dev->kref);
 705                 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
 706
 707                 spin_unlock_irq(&ha->lock);
 708
 709                 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
 710                         i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
 711
 712                 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
 713                         i->dft->lldd_I_T_nexus_reset(dev);
 714
 715                 sas_put_device(dev);
 716                 spin_lock_irq(&ha->lock);
 717                 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
 718                 ha->eh_active--;
 719         }
 720         spin_unlock_irq(&ha->lock);
 721 }
 722
 723
 724 void sas_scsi_recover_host(struct Scsi_Host *shost)
 725 {
 726         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 727         LIST_HEAD(eh_work_q);
 728         int tries = 0;
 729         bool retry;
 730
 731 retry:
 732         tries++;
 733         retry = true;
 734         spin_lock_irq(shost->host_lock);
 735         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 736         spin_unlock_irq(shost->host_lock);
 737
 738         pr_notice("Enter %s busy: %d failed: %d\n",
 739                   __func__, scsi_host_busy(shost), shost->host_failed);
 740         /*
 741          * Deal with commands that still have SAS tasks (i.e. they didn't
 742          * complete via the normal sas_task completion mechanism),
 743          * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
 744          */
 745         set_bit(SAS_HA_FROZEN, &ha->state);
 746         sas_eh_handle_sas_errors(shost, &eh_work_q);
 747         clear_bit(SAS_HA_FROZEN, &ha->state);
 748         if (list_empty(&eh_work_q))
 749                 goto out;
 750
 751         /*
 752          * Now deal with SCSI commands that completed ok but have a an error
 753          * code (and hopefully sense data) attached.  This is roughly what
 754          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 755          * command we see here has no sas_task and is thus unknown to the HA.
 756          */
 757         sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
 758         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 759                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 760
 761 out:
 762         sas_eh_handle_resets(shost);
 763
 764         /* now link into libata eh --- if we have any ata devices */
 765         sas_ata_strategy_handler(shost);
 766
 767         scsi_eh_flush_done_q(&ha->eh_done_q);
 768
 769         /* check if any new eh work was scheduled during the last run */
 770         spin_lock_irq(&ha->lock);
 771         if (ha->eh_active == 0) {
 772                 shost->host_eh_scheduled = 0;
 773                 retry = false;
 774         }
 775         spin_unlock_irq(&ha->lock);
 776
 777         if (retry)
 778                 goto retry;
 779
 780         pr_notice("--- Exit %s: busy: %d failed: %d tries: %d\n",
 781                   __func__, scsi_host_busy(shost),
 782                   shost->host_failed, tries);
 783 }
 784
 785 int sas_ioctl(struct scsi_device *sdev, unsigned int cmd, void __user *arg)
 786 {
 787         struct domain_device *dev = sdev_to_domain_dev(sdev);
 788
 789         if (dev_is_sata(dev))
 790                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
 791
 792         return -EINVAL;
 793 }
 794
 795 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 796 {
 797         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 798         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 799         struct domain_device *found_dev = NULL;
 800         int i;
 801         unsigned long flags;
 802
 803         spin_lock_irqsave(&ha->phy_port_lock, flags);
 804         for (i = 0; i < ha->num_phys; i++) {
 805                 struct asd_sas_port *port = ha->sas_port[i];
 806                 struct domain_device *dev;
 807
 808                 spin_lock(&port->dev_list_lock);
 809                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 810                         if (rphy == dev->rphy) {
 811                                 found_dev = dev;
 812                                 spin_unlock(&port->dev_list_lock);
 813                                 goto found;
 814                         }
 815                 }
 816                 spin_unlock(&port->dev_list_lock);
 817         }
 818  found:
 819         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 820
 821         return found_dev;
 822 }
 823
 824 int sas_target_alloc(struct scsi_target *starget)
 825 {
 826         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 827         struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
 828
 829         if (!found_dev)
 830                 return -ENODEV;
 831
 832         kref_get(&found_dev->kref);
 833         starget->hostdata = found_dev;
 834         return 0;
 835 }
 836
 837 #define SAS_DEF_QD 256
 838
 839 int sas_slave_configure(struct scsi_device *scsi_dev)
 840 {
 841         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 842
 843         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 844
 845         if (dev_is_sata(dev)) {
 846                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 847                 return 0;
 848         }
 849
 850         sas_read_port_mode_page(scsi_dev);
 851
 852         if (scsi_dev->tagged_supported) {
 853                 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
 854         } else {
 855                 pr_notice("device %llx, LUN %llx doesn't support TCQ\n",
 856                           SAS_ADDR(dev->sas_addr), scsi_dev->lun);
 857                 scsi_change_queue_depth(scsi_dev, 1);
 858         }
 859
 860         scsi_dev->allow_restart = 1;
 861
 862         return 0;
 863 }
 864
 865 int sas_change_queue_depth(struct scsi_device *sdev, int depth)
 866 {
 867         struct domain_device *dev = sdev_to_domain_dev(sdev);
 868
 869         if (dev_is_sata(dev))
 870                 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
 871
 872         if (!sdev->tagged_supported)
 873                 depth = 1;
 874         return scsi_change_queue_depth(sdev, depth);
 875 }
 876
 877 int sas_bios_param(struct scsi_device *scsi_dev,
 878                           struct block_device *bdev,
 879                           sector_t capacity, int *hsc)
 880 {
 881         hsc[0] = 255;
 882         hsc[1] = 63;
 883         sector_div(capacity, 255*63);
 884         hsc[2] = capacity;
 885
 886         return 0;
 887 }
 888
 889 /*
 890  * Tell an upper layer that it needs to initiate an abort for a given task.
 891  * This should only ever be called by an LLDD.
 892  */
 893 void sas_task_abort(struct sas_task *task)
 894 {
 895         struct scsi_cmnd *sc = task->uldd_task;
 896
 897         /* Escape for libsas internal commands */
 898         if (!sc) {
 899                 struct sas_task_slow *slow = task->slow_task;
 900
 901                 if (!slow)
 902                         return;
 903                 if (!del_timer(&slow->timer))
 904                         return;
 905                 slow->timer.function(&slow->timer);
 906                 return;
 907         }
 908
 909         if (dev_is_sata(task->dev))
 910                 sas_ata_task_abort(task);
 911         else
 912                 blk_abort_request(sc->request);
 913 }
 914
 915 void sas_target_destroy(struct scsi_target *starget)
 916 {
 917         struct domain_device *found_dev = starget->hostdata;
 918
 919         if (!found_dev)
 920                 return;
 921
 922         starget->hostdata = NULL;
 923         sas_put_device(found_dev);
 924 }
 925
 926 #define SAS_STRING_ADDR_SIZE    16
 927
 928 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
 929 {
 930         int res;
 931         const struct firmware *fw;
 932
 933         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
 934         if (res)
 935                 return res;
 936
 937         if (fw->size < SAS_STRING_ADDR_SIZE) {
 938                 res = -ENODEV;
 939                 goto out;
 940         }
 941
 942         res = hex2bin(addr, fw->data, strnlen(fw->data, SAS_ADDR_SIZE * 2) / 2);
 943         if (res)
 944                 goto out;
 945
 946 out:
 947         release_firmware(fw);
 948         return res;
 949 }
 950 EXPORT_SYMBOL_GPL(sas_request_addr);
 951
 952 EXPORT_SYMBOL_GPL(sas_queuecommand);
 953 EXPORT_SYMBOL_GPL(sas_target_alloc);
 954 EXPORT_SYMBOL_GPL(sas_slave_configure);
 955 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
 956 EXPORT_SYMBOL_GPL(sas_bios_param);
 957 EXPORT_SYMBOL_GPL(sas_task_abort);
 958 EXPORT_SYMBOL_GPL(sas_phy_reset);
 959 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
 960 EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
 961 EXPORT_SYMBOL_GPL(sas_target_destroy);
 962 EXPORT_SYMBOL_GPL(sas_ioctl);