err.no Git - linux-2.6/blob - drivers/scsi/libsas/sas_scsi_host.c

   1 /*
   2  * Serial Attached SCSI (SAS) class SCSI Host glue.
   3  *
   4  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   5  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   6  *
   7  * This file is licensed under GPLv2.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22  * USA
  23  *
  24  */
  25
  26 #include <linux/kthread.h>
  27
  28 #include "sas_internal.h"
  29
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_device.h>
  32 #include <scsi/scsi_tcq.h>
  33 #include <scsi/scsi.h>
  34 #include <scsi/scsi_eh.h>
  35 #include <scsi/scsi_transport.h>
  36 #include <scsi/scsi_transport_sas.h>
  37 #include "../scsi_sas_internal.h"
  38 #include "../scsi_transport_api.h"
  39 #include "../scsi_priv.h"
  40
  41 #include <linux/err.h>
  42 #include <linux/blkdev.h>
  43 #include <linux/freezer.h>
  44 #include <linux/scatterlist.h>
  45 #include <linux/libata.h>
  46
  47 /* ---------- SCSI Host glue ---------- */
  48
  49 #define TO_SAS_TASK(_scsi_cmd)  ((void *)(_scsi_cmd)->host_scribble)
  50 #define ASSIGN_SAS_TASK(_sc, _t) do { (_sc)->host_scribble = (void *) _t; } while (0)
  51
  52 static void sas_scsi_task_done(struct sas_task *task)
  53 {
  54         struct task_status_struct *ts = &task->task_status;
  55         struct scsi_cmnd *sc = task->uldd_task;
  56         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(sc->device->host);
  57         unsigned ts_flags = task->task_state_flags;
  58         int hs = 0, stat = 0;
  59
  60         if (unlikely(!sc)) {
  61                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  62                 list_del_init(&task->list);
  63                 sas_free_task(task);
  64                 return;
  65         }
  66
  67         if (ts->resp == SAS_TASK_UNDELIVERED) {
  68                 /* transport error */
  69                 hs = DID_NO_CONNECT;
  70         } else { /* ts->resp == SAS_TASK_COMPLETE */
  71                 /* task delivered, what happened afterwards? */
  72                 switch (ts->stat) {
  73                 case SAS_DEV_NO_RESPONSE:
  74                 case SAS_INTERRUPTED:
  75                 case SAS_PHY_DOWN:
  76                 case SAS_NAK_R_ERR:
  77                 case SAS_OPEN_TO:
  78                         hs = DID_NO_CONNECT;
  79                         break;
  80                 case SAS_DATA_UNDERRUN:
  81                         scsi_set_resid(sc, ts->residual);
  82                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  83                                 hs = DID_ERROR;
  84                         break;
  85                 case SAS_DATA_OVERRUN:
  86                         hs = DID_ERROR;
  87                         break;
  88                 case SAS_QUEUE_FULL:
  89                         hs = DID_SOFT_ERROR; /* retry */
  90                         break;
  91                 case SAS_DEVICE_UNKNOWN:
  92                         hs = DID_BAD_TARGET;
  93                         break;
  94                 case SAS_SG_ERR:
  95                         hs = DID_PARITY;
  96                         break;
  97                 case SAS_OPEN_REJECT:
  98                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
  99                                 hs = DID_SOFT_ERROR; /* retry */
 100                         else
 101                                 hs = DID_ERROR;
 102                         break;
 103                 case SAS_PROTO_RESPONSE:
 104                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
 105                                     "task; please report this\n",
 106                                     task->dev->port->ha->sas_ha_name);
 107                         break;
 108                 case SAS_ABORTED_TASK:
 109                         hs = DID_ABORT;
 110                         break;
 111                 case SAM_CHECK_COND:
 112                         memcpy(sc->sense_buffer, ts->buf,
 113                                max(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 114                         stat = SAM_CHECK_COND;
 115                         break;
 116                 default:
 117                         stat = ts->stat;
 118                         break;
 119                 }
 120         }
 121         ASSIGN_SAS_TASK(sc, NULL);
 122         sc->result = (hs << 16) | stat;
 123         list_del_init(&task->list);
 124         sas_free_task(task);
 125         /* This is very ugly but this is how SCSI Core works. */
 126         if (ts_flags & SAS_TASK_STATE_ABORTED)
 127                 scsi_eh_finish_cmd(sc, &sas_ha->eh_done_q);
 128         else
 129                 sc->scsi_done(sc);
 130 }
 131
 132 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
 133 {
 134         enum task_attribute ta = TASK_ATTR_SIMPLE;
 135         if (cmd->request && blk_rq_tagged(cmd->request)) {
 136                 if (cmd->device->ordered_tags &&
 137                     (cmd->request->cmd_flags & REQ_HARDBARRIER))
 138                         ta = TASK_ATTR_ORDERED;
 139         }
 140         return ta;
 141 }
 142
 143 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 144                                                struct domain_device *dev,
 145                                                gfp_t gfp_flags)
 146 {
 147         struct sas_task *task = sas_alloc_task(gfp_flags);
 148         struct scsi_lun lun;
 149
 150         if (!task)
 151                 return NULL;
 152
 153         *(u32 *)cmd->sense_buffer = 0;
 154         task->uldd_task = cmd;
 155         ASSIGN_SAS_TASK(cmd, task);
 156
 157         task->dev = dev;
 158         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 159
 160         task->ssp_task.retry_count = 1;
 161         int_to_scsilun(cmd->device->lun, &lun);
 162         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 163         task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
 164         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 165
 166         task->scatter = scsi_sglist(cmd);
 167         task->num_scatter = scsi_sg_count(cmd);
 168         task->total_xfer_len = scsi_bufflen(cmd);
 169         task->data_dir = cmd->sc_data_direction;
 170
 171         task->task_done = sas_scsi_task_done;
 172
 173         return task;
 174 }
 175
 176 static int sas_queue_up(struct sas_task *task)
 177 {
 178         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 179         struct scsi_core *core = &sas_ha->core;
 180         unsigned long flags;
 181         LIST_HEAD(list);
 182
 183         spin_lock_irqsave(&core->task_queue_lock, flags);
 184         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 185                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 186                 return -SAS_QUEUE_FULL;
 187         }
 188         list_add_tail(&task->list, &core->task_queue);
 189         core->task_queue_size += 1;
 190         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 191         wake_up_process(core->queue_thread);
 192
 193         return 0;
 194 }
 195
 196 static inline int dev_is_sata(struct domain_device *dev)
 197 {
 198         return (dev->rphy->identify.target_port_protocols & SAS_PROTOCOL_SATA);
 199 }
 200
 201 /**
 202  * sas_queuecommand -- Enqueue a command for processing
 203  * @parameters: See SCSI Core documentation
 204  *
 205  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
 206  * call us without holding an IRQ spinlock...
 207  */
 208 int sas_queuecommand(struct scsi_cmnd *cmd,
 209                      void (*scsi_done)(struct scsi_cmnd *))
 210 {
 211         int res = 0;
 212         struct domain_device *dev = cmd_to_domain_dev(cmd);
 213         struct Scsi_Host *host = cmd->device->host;
 214         struct sas_internal *i = to_sas_internal(host->transportt);
 215
 216         spin_unlock_irq(host->host_lock);
 217
 218         {
 219                 struct sas_ha_struct *sas_ha = dev->port->ha;
 220                 struct sas_task *task;
 221
 222                 if (dev_is_sata(dev)) {
 223                         res = ata_sas_queuecmd(cmd, scsi_done,
 224                                                dev->sata_dev.ap);
 225                         goto out;
 226                 }
 227
 228                 res = -ENOMEM;
 229                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
 230                 if (!task)
 231                         goto out;
 232
 233                 cmd->scsi_done = scsi_done;
 234                 /* Queue up, Direct Mode or Task Collector Mode. */
 235                 if (sas_ha->lldd_max_execute_num < 2)
 236                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 237                 else
 238                         res = sas_queue_up(task);
 239
 240                 /* Examine */
 241                 if (res) {
 242                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 243                         ASSIGN_SAS_TASK(cmd, NULL);
 244                         sas_free_task(task);
 245                         if (res == -SAS_QUEUE_FULL) {
 246                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 247                                 res = 0;
 248                                 scsi_done(cmd);
 249                         }
 250                         goto out;
 251                 }
 252         }
 253 out:
 254         spin_lock_irq(host->host_lock);
 255         return res;
 256 }
 257
 258 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 259 {
 260         struct scsi_cmnd *cmd, *n;
 261
 262         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 263                 if (cmd == my_cmd)
 264                         list_del_init(&cmd->eh_entry);
 265         }
 266 }
 267
 268 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 269                                      struct domain_device *dev)
 270 {
 271         struct scsi_cmnd *cmd, *n;
 272
 273         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 274                 struct domain_device *x = cmd_to_domain_dev(cmd);
 275
 276                 if (x == dev)
 277                         list_del_init(&cmd->eh_entry);
 278         }
 279 }
 280
 281 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 282                                       struct asd_sas_port *port)
 283 {
 284         struct scsi_cmnd *cmd, *n;
 285
 286         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 287                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 288                 struct asd_sas_port *x = dev->port;
 289
 290                 if (x == port)
 291                         list_del_init(&cmd->eh_entry);
 292         }
 293 }
 294
 295 enum task_disposition {
 296         TASK_IS_DONE,
 297         TASK_IS_ABORTED,
 298         TASK_IS_AT_LU,
 299         TASK_IS_NOT_AT_LU,
 300         TASK_ABORT_FAILED,
 301 };
 302
 303 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 304 {
 305         struct sas_ha_struct *ha = task->dev->port->ha;
 306         unsigned long flags;
 307         int i, res;
 308         struct sas_internal *si =
 309                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 310
 311         if (ha->lldd_max_execute_num > 1) {
 312                 struct scsi_core *core = &ha->core;
 313                 struct sas_task *t, *n;
 314
 315                 spin_lock_irqsave(&core->task_queue_lock, flags);
 316                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 317                         if (task == t) {
 318                                 list_del_init(&t->list);
 319                                 spin_unlock_irqrestore(&core->task_queue_lock,
 320                                                        flags);
 321                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 322                                             "task_queue\n",
 323                                             __FUNCTION__, task);
 324                                 return TASK_IS_ABORTED;
 325                         }
 326                 }
 327                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 328         }
 329
 330         for (i = 0; i < 5; i++) {
 331                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 332                 res = si->dft->lldd_abort_task(task);
 333
 334                 spin_lock_irqsave(&task->task_state_lock, flags);
 335                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 336                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 337                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 338                                     task);
 339                         return TASK_IS_DONE;
 340                 }
 341                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 342
 343                 if (res == TMF_RESP_FUNC_COMPLETE) {
 344                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 345                                     __FUNCTION__, task);
 346                         return TASK_IS_ABORTED;
 347                 } else if (si->dft->lldd_query_task) {
 348                         SAS_DPRINTK("%s: querying task 0x%p\n",
 349                                     __FUNCTION__, task);
 350                         res = si->dft->lldd_query_task(task);
 351                         switch (res) {
 352                         case TMF_RESP_FUNC_SUCC:
 353                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 354                                             __FUNCTION__, task);
 355                                 return TASK_IS_AT_LU;
 356                         case TMF_RESP_FUNC_COMPLETE:
 357                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 358                                             __FUNCTION__, task);
 359                                 return TASK_IS_NOT_AT_LU;
 360                         case TMF_RESP_FUNC_FAILED:
 361                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 362                                                 __FUNCTION__, task);
 363                                 return TASK_ABORT_FAILED;
 364                         }
 365
 366                 }
 367         }
 368         return res;
 369 }
 370
 371 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 372 {
 373         int res = TMF_RESP_FUNC_FAILED;
 374         struct scsi_lun lun;
 375         struct sas_internal *i =
 376                 to_sas_internal(dev->port->ha->core.shost->transportt);
 377
 378         int_to_scsilun(cmd->device->lun, &lun);
 379
 380         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 381                     SAS_ADDR(dev->sas_addr),
 382                     cmd->device->lun);
 383
 384         if (i->dft->lldd_abort_task_set)
 385                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 386
 387         if (res == TMF_RESP_FUNC_FAILED) {
 388                 if (i->dft->lldd_clear_task_set)
 389                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 390         }
 391
 392         if (res == TMF_RESP_FUNC_FAILED) {
 393                 if (i->dft->lldd_lu_reset)
 394                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 395         }
 396
 397         return res;
 398 }
 399
 400 static int sas_recover_I_T(struct domain_device *dev)
 401 {
 402         int res = TMF_RESP_FUNC_FAILED;
 403         struct sas_internal *i =
 404                 to_sas_internal(dev->port->ha->core.shost->transportt);
 405
 406         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 407                     SAS_ADDR(dev->sas_addr));
 408
 409         if (i->dft->lldd_I_T_nexus_reset)
 410                 res = i->dft->lldd_I_T_nexus_reset(dev);
 411
 412         return res;
 413 }
 414
 415 /* Find the sas_phy that's attached to this device */
 416 struct sas_phy *find_local_sas_phy(struct domain_device *dev)
 417 {
 418         struct domain_device *pdev = dev->parent;
 419         struct ex_phy *exphy = NULL;
 420         int i;
 421
 422         /* Directly attached device */
 423         if (!pdev)
 424                 return dev->port->phy;
 425
 426         /* Otherwise look in the expander */
 427         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 428                 if (!memcmp(dev->sas_addr,
 429                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 430                             SAS_ADDR_SIZE)) {
 431                         exphy = &pdev->ex_dev.ex_phy[i];
 432                         break;
 433                 }
 434
 435         BUG_ON(!exphy);
 436         return exphy->phy;
 437 }
 438
 439 /* Attempt to send a LUN reset message to a device */
 440 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 441 {
 442         struct domain_device *dev = cmd_to_domain_dev(cmd);
 443         struct sas_internal *i =
 444                 to_sas_internal(dev->port->ha->core.shost->transportt);
 445         struct scsi_lun lun;
 446         int res;
 447
 448         int_to_scsilun(cmd->device->lun, &lun);
 449
 450         if (!i->dft->lldd_lu_reset)
 451                 return FAILED;
 452
 453         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 454         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 455                 return SUCCESS;
 456
 457         return FAILED;
 458 }
 459
 460 /* Attempt to send a phy (bus) reset */
 461 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 462 {
 463         struct domain_device *dev = cmd_to_domain_dev(cmd);
 464         struct sas_phy *phy = find_local_sas_phy(dev);
 465         int res;
 466
 467         res = sas_phy_reset(phy, 1);
 468         if (res)
 469                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 470                             phy->dev.kobj.k_name,
 471                             res);
 472         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 473                 return SUCCESS;
 474
 475         return FAILED;
 476 }
 477
 478 /* Try to reset a device */
 479 static int try_to_reset_cmd_device(struct Scsi_Host *shost,
 480                                    struct scsi_cmnd *cmd)
 481 {
 482         int res;
 483
 484         if (!shost->hostt->eh_device_reset_handler)
 485                 goto try_bus_reset;
 486
 487         res = shost->hostt->eh_device_reset_handler(cmd);
 488         if (res == SUCCESS)
 489                 return res;
 490
 491 try_bus_reset:
 492         if (shost->hostt->eh_bus_reset_handler)
 493                 return shost->hostt->eh_bus_reset_handler(cmd);
 494
 495         return FAILED;
 496 }
 497
 498 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 499                                     struct list_head *work_q,
 500                                     struct list_head *done_q)
 501 {
 502         struct scsi_cmnd *cmd, *n;
 503         enum task_disposition res = TASK_IS_DONE;
 504         int tmf_resp, need_reset;
 505         struct sas_internal *i = to_sas_internal(shost->transportt);
 506         unsigned long flags;
 507         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 508
 509 Again:
 510         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 511                 struct sas_task *task = TO_SAS_TASK(cmd);
 512
 513                 if (!task)
 514                         continue;
 515
 516                 list_del_init(&cmd->eh_entry);
 517
 518                 spin_lock_irqsave(&task->task_state_lock, flags);
 519                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 520                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 521
 522                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 523                 res = sas_scsi_find_task(task);
 524
 525                 cmd->eh_eflags = 0;
 526
 527                 switch (res) {
 528                 case TASK_IS_DONE:
 529                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 530                                     task);
 531                         task->task_done(task);
 532                         if (need_reset)
 533                                 try_to_reset_cmd_device(shost, cmd);
 534                         continue;
 535                 case TASK_IS_ABORTED:
 536                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 537                                     __FUNCTION__, task);
 538                         task->task_done(task);
 539                         if (need_reset)
 540                                 try_to_reset_cmd_device(shost, cmd);
 541                         continue;
 542                 case TASK_IS_AT_LU:
 543                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 544                         tmf_resp = sas_recover_lu(task->dev, cmd);
 545                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 546                                 SAS_DPRINTK("dev %016llx LU %x is "
 547                                             "recovered\n",
 548                                             SAS_ADDR(task->dev),
 549                                             cmd->device->lun);
 550                                 task->task_done(task);
 551                                 if (need_reset)
 552                                         try_to_reset_cmd_device(shost, cmd);
 553                                 sas_scsi_clear_queue_lu(work_q, cmd);
 554                                 goto Again;
 555                         }
 556                         /* fallthrough */
 557                 case TASK_IS_NOT_AT_LU:
 558                 case TASK_ABORT_FAILED:
 559                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 560                                     task);
 561                         tmf_resp = sas_recover_I_T(task->dev);
 562                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 563                                 SAS_DPRINTK("I_T %016llx recovered\n",
 564                                             SAS_ADDR(task->dev->sas_addr));
 565                                 task->task_done(task);
 566                                 if (need_reset)
 567                                         try_to_reset_cmd_device(shost, cmd);
 568                                 sas_scsi_clear_queue_I_T(work_q, task->dev);
 569                                 goto Again;
 570                         }
 571                         /* Hammer time :-) */
 572                         if (i->dft->lldd_clear_nexus_port) {
 573                                 struct asd_sas_port *port = task->dev->port;
 574                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 575                                             port->id);
 576                                 res = i->dft->lldd_clear_nexus_port(port);
 577                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 578                                         SAS_DPRINTK("clear nexus port:%d "
 579                                                     "succeeded\n", port->id);
 580                                         task->task_done(task);
 581                                         if (need_reset)
 582                                                 try_to_reset_cmd_device(shost, cmd);
 583                                         sas_scsi_clear_queue_port(work_q,
 584                                                                   port);
 585                                         goto Again;
 586                                 }
 587                         }
 588                         if (i->dft->lldd_clear_nexus_ha) {
 589                                 SAS_DPRINTK("clear nexus ha\n");
 590                                 res = i->dft->lldd_clear_nexus_ha(ha);
 591                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 592                                         SAS_DPRINTK("clear nexus ha "
 593                                                     "succeeded\n");
 594                                         task->task_done(task);
 595                                         if (need_reset)
 596                                                 try_to_reset_cmd_device(shost, cmd);
 597                                         goto out;
 598                                 }
 599                         }
 600                         /* If we are here -- this means that no amount
 601                          * of effort could recover from errors.  Quite
 602                          * possibly the HA just disappeared.
 603                          */
 604                         SAS_DPRINTK("error from  device %llx, LUN %x "
 605                                     "couldn't be recovered in any way\n",
 606                                     SAS_ADDR(task->dev->sas_addr),
 607                                     cmd->device->lun);
 608
 609                         task->task_done(task);
 610                         if (need_reset)
 611                                 try_to_reset_cmd_device(shost, cmd);
 612                         goto clear_q;
 613                 }
 614         }
 615 out:
 616         return list_empty(work_q);
 617 clear_q:
 618         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 619         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 620                 struct sas_task *task = TO_SAS_TASK(cmd);
 621                 list_del_init(&cmd->eh_entry);
 622                 task->task_done(task);
 623         }
 624         return list_empty(work_q);
 625 }
 626
 627 void sas_scsi_recover_host(struct Scsi_Host *shost)
 628 {
 629         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 630         unsigned long flags;
 631         LIST_HEAD(eh_work_q);
 632
 633         spin_lock_irqsave(shost->host_lock, flags);
 634         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 635         spin_unlock_irqrestore(shost->host_lock, flags);
 636
 637         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 638         /*
 639          * Deal with commands that still have SAS tasks (i.e. they didn't
 640          * complete via the normal sas_task completion mechanism)
 641          */
 642         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 643                 goto out;
 644
 645         /*
 646          * Now deal with SCSI commands that completed ok but have a an error
 647          * code (and hopefully sense data) attached.  This is roughly what
 648          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 649          * command we see here has no sas_task and is thus unknown to the HA.
 650          */
 651         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 652                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 653
 654 out:
 655         scsi_eh_flush_done_q(&ha->eh_done_q);
 656         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 657         return;
 658 }
 659
 660 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 661 {
 662         struct sas_task *task = TO_SAS_TASK(cmd);
 663         unsigned long flags;
 664
 665         if (!task) {
 666                 cmd->timeout_per_command /= 2;
 667                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 668                             cmd, task, (cmd->timeout_per_command ?
 669                             "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
 670                 if (!cmd->timeout_per_command)
 671                         return EH_NOT_HANDLED;
 672                 return EH_RESET_TIMER;
 673         }
 674
 675         spin_lock_irqsave(&task->task_state_lock, flags);
 676         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 677         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 678                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 679                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 680                             cmd, task);
 681                 return EH_HANDLED;
 682         }
 683         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 684                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 685                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 686                             "EH_RESET_TIMER\n",
 687                             cmd, task);
 688                 return EH_RESET_TIMER;
 689         }
 690         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 691         spin_unlock_irqrestore(&task->task_state_lock, flags);
 692
 693         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 694                     cmd, task);
 695
 696         return EH_NOT_HANDLED;
 697 }
 698
 699
 700 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
 701 {
 702         /* Cheesy attempt to translate SAS errors into ATA.  Hah! */
 703
 704         /* transport error */
 705         if (ts->resp == SAS_TASK_UNDELIVERED)
 706                 return AC_ERR_ATA_BUS;
 707
 708         /* ts->resp == SAS_TASK_COMPLETE */
 709         /* task delivered, what happened afterwards? */
 710         switch (ts->stat) {
 711                 case SAS_DEV_NO_RESPONSE:
 712                         return AC_ERR_TIMEOUT;
 713
 714                 case SAS_INTERRUPTED:
 715                 case SAS_PHY_DOWN:
 716                 case SAS_NAK_R_ERR:
 717                         return AC_ERR_ATA_BUS;
 718
 719
 720                 case SAS_DATA_UNDERRUN:
 721                         /*
 722                          * Some programs that use the taskfile interface
 723                          * (smartctl in particular) can cause underrun
 724                          * problems.  Ignore these errors, perhaps at our
 725                          * peril.
 726                          */
 727                         return 0;
 728
 729                 case SAS_DATA_OVERRUN:
 730                 case SAS_QUEUE_FULL:
 731                 case SAS_DEVICE_UNKNOWN:
 732                 case SAS_SG_ERR:
 733                         return AC_ERR_INVALID;
 734
 735                 case SAM_CHECK_COND:
 736                 case SAS_OPEN_TO:
 737                 case SAS_OPEN_REJECT:
 738                 case SAS_PROTO_RESPONSE:
 739                         SAS_DPRINTK("%s: Saw error %d.  What to do?\n",
 740                                     __FUNCTION__, ts->stat);
 741                         return AC_ERR_OTHER;
 742
 743                 case SAS_ABORTED_TASK:
 744                         return AC_ERR_DEV;
 745
 746                 default:
 747                         return 0;
 748         }
 749 }
 750
 751 static void sas_ata_task_done(struct sas_task *task)
 752 {
 753         struct ata_queued_cmd *qc = task->uldd_task;
 754         struct domain_device *dev = qc->ap->private_data;
 755         struct task_status_struct *stat = &task->task_status;
 756         struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
 757         enum ata_completion_errors ac;
 758
 759         ac = sas_to_ata_err(stat);
 760         if (ac) {
 761                 SAS_DPRINTK("%s: SAS error %x\n", __FUNCTION__, stat->stat);
 762                 /* We saw a SAS error. Send a vague error. */
 763                 qc->err_mask = ac;
 764                 dev->sata_dev.tf.feature = 0x04; /* status err */
 765                 dev->sata_dev.tf.command = ATA_ERR;
 766                 goto end;
 767         }
 768
 769         ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
 770         qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
 771         dev->sata_dev.sstatus = resp->sstatus;
 772         dev->sata_dev.serror = resp->serror;
 773         dev->sata_dev.scontrol = resp->scontrol;
 774         dev->sata_dev.ap->sactive = resp->sactive;
 775 end:
 776         ata_qc_complete(qc);
 777         list_del_init(&task->list);
 778         sas_free_task(task);
 779 }
 780
 781 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 782 {
 783         struct domain_device *dev = sdev_to_domain_dev(sdev);
 784
 785         if (dev_is_sata(dev))
 786                 return ata_scsi_ioctl(sdev, cmd, arg);
 787
 788         return -EINVAL;
 789 }
 790
 791 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 792 {
 793         int res = -ENOMEM;
 794         struct sas_task *task;
 795         struct domain_device *dev = qc->ap->private_data;
 796         struct sas_ha_struct *sas_ha = dev->port->ha;
 797         struct Scsi_Host *host = sas_ha->core.shost;
 798         struct sas_internal *i = to_sas_internal(host->transportt);
 799         struct scatterlist *sg;
 800         unsigned int num = 0;
 801         unsigned int xfer = 0;
 802
 803         task = sas_alloc_task(GFP_ATOMIC);
 804         if (!task)
 805                 goto out;
 806         task->dev = dev;
 807         task->task_proto = SAS_PROTOCOL_STP;
 808         task->task_done = sas_ata_task_done;
 809
 810         ata_tf_to_fis(&qc->tf, (u8*)&task->ata_task.fis, 0);
 811         task->uldd_task = qc;
 812         if (is_atapi_taskfile(&qc->tf)) {
 813                 memcpy(task->ata_task.atapi_packet, qc->cdb, ATAPI_CDB_LEN);
 814                 task->total_xfer_len = qc->nbytes + qc->pad_len;
 815                 task->num_scatter = qc->pad_len ? qc->n_elem + 1 : qc->n_elem;
 816         } else {
 817                 ata_for_each_sg(sg, qc) {
 818                         num++;
 819                         xfer += sg->length;
 820                 }
 821
 822                 task->total_xfer_len = xfer;
 823                 task->num_scatter = num;
 824         }
 825
 826         task->data_dir = qc->dma_dir;
 827         task->scatter = qc->__sg;
 828         task->ata_task.retry_count = 1;
 829         task->task_state_flags = SAS_TASK_STATE_PENDING;
 830
 831         switch (qc->tf.protocol) {
 832         case ATA_PROT_NCQ:
 833                 task->ata_task.use_ncq = 1;
 834                 /* fall through */
 835         case ATA_PROT_DMA:
 836                 task->ata_task.dma_xfer = 1;
 837                 break;
 838         }
 839
 840         if (sas_ha->lldd_max_execute_num < 2)
 841                 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 842         else
 843                 res = sas_queue_up(task);
 844
 845         /* Examine */
 846         if (res) {
 847                 SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 848
 849                 sas_free_task(task);
 850                 if (res == -SAS_QUEUE_FULL)
 851                         return -ENOMEM;
 852         }
 853
 854 out:
 855         return res;
 856 }
 857
 858 static u8 sas_ata_check_status(struct ata_port *ap)
 859 {
 860         struct domain_device *dev = ap->private_data;
 861         return dev->sata_dev.tf.command;
 862 }
 863
 864 static void sas_ata_phy_reset(struct ata_port *ap)
 865 {
 866         struct domain_device *dev = ap->private_data;
 867         struct sas_internal *i =
 868                 to_sas_internal(dev->port->ha->core.shost->transportt);
 869         int res = 0;
 870
 871         if (i->dft->lldd_I_T_nexus_reset)
 872                 res = i->dft->lldd_I_T_nexus_reset(dev);
 873
 874         if (res)
 875                 SAS_DPRINTK("%s: Unable to reset I T nexus?\n", __FUNCTION__);
 876
 877         switch (dev->sata_dev.command_set) {
 878                 case ATA_COMMAND_SET:
 879                         SAS_DPRINTK("%s: Found ATA device.\n", __FUNCTION__);
 880                         ap->device[0].class = ATA_DEV_ATA;
 881                         break;
 882                 case ATAPI_COMMAND_SET:
 883                         SAS_DPRINTK("%s: Found ATAPI device.\n", __FUNCTION__);
 884                         ap->device[0].class = ATA_DEV_ATAPI;
 885                         break;
 886                 default:
 887                         SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
 888                                     __FUNCTION__,
 889                                     dev->sata_dev.command_set);
 890                         ap->device[0].class = ATA_DEV_ATA;
 891                         break;
 892         }
 893
 894         ap->cbl = ATA_CBL_SATA;
 895 }
 896
 897 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 898 {
 899         if (qc->flags & ATA_QCFLAG_FAILED)
 900                 qc->err_mask |= AC_ERR_OTHER;
 901
 902         if (qc->err_mask)
 903                 SAS_DPRINTK("%s: Failure; reset phy!\n", __FUNCTION__);
 904 }
 905
 906 static void sas_ata_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
 907 {
 908         struct domain_device *dev = ap->private_data;
 909         memcpy(tf, &dev->sata_dev.tf, sizeof (*tf));
 910 }
 911
 912 static void sas_ata_scr_write(struct ata_port *ap, unsigned int sc_reg_in,
 913                               u32 val)
 914 {
 915         struct domain_device *dev = ap->private_data;
 916
 917         SAS_DPRINTK("STUB %s\n", __FUNCTION__);
 918         switch (sc_reg_in) {
 919                 case SCR_STATUS:
 920                         dev->sata_dev.sstatus = val;
 921                         break;
 922                 case SCR_CONTROL:
 923                         dev->sata_dev.scontrol = val;
 924                         break;
 925                 case SCR_ERROR:
 926                         dev->sata_dev.serror = val;
 927                         break;
 928                 case SCR_ACTIVE:
 929                         dev->sata_dev.ap->sactive = val;
 930                         break;
 931         }
 932 }
 933
 934 static u32 sas_ata_scr_read(struct ata_port *ap, unsigned int sc_reg_in)
 935 {
 936         struct domain_device *dev = ap->private_data;
 937
 938         SAS_DPRINTK("STUB %s\n", __FUNCTION__);
 939         switch (sc_reg_in) {
 940                 case SCR_STATUS:
 941                         return dev->sata_dev.sstatus;
 942                 case SCR_CONTROL:
 943                         return dev->sata_dev.scontrol;
 944                 case SCR_ERROR:
 945                         return dev->sata_dev.serror;
 946                 case SCR_ACTIVE:
 947                         return dev->sata_dev.ap->sactive;
 948                 default:
 949                         return 0xffffffffU;
 950         }
 951 }
 952
 953 static struct ata_port_operations sas_sata_ops = {
 954         .port_disable           = ata_port_disable,
 955         .check_status           = sas_ata_check_status,
 956         .check_altstatus        = sas_ata_check_status,
 957         .dev_select             = ata_noop_dev_select,
 958         .phy_reset              = sas_ata_phy_reset,
 959         .post_internal_cmd      = sas_ata_post_internal,
 960         .tf_read                = sas_ata_tf_read,
 961         .qc_prep                = ata_noop_qc_prep,
 962         .qc_issue               = sas_ata_qc_issue,
 963         .port_start             = ata_sas_port_start,
 964         .port_stop              = ata_sas_port_stop,
 965         .scr_read               = sas_ata_scr_read,
 966         .scr_write              = sas_ata_scr_write
 967 };
 968
 969 static struct ata_port_info sata_port_info = {
 970         .flags = ATA_FLAG_SATA | ATA_FLAG_NO_LEGACY | ATA_FLAG_SATA_RESET |
 971                 ATA_FLAG_MMIO | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
 972         .pio_mask = 0x1f, /* PIO0-4 */
 973         .mwdma_mask = 0x07, /* MWDMA0-2 */
 974         .udma_mask = ATA_UDMA6,
 975         .port_ops = &sas_sata_ops
 976 };
 977
 978 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 979 {
 980         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 981         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 982         struct domain_device *found_dev = NULL;
 983         int i;
 984         unsigned long flags;
 985
 986         spin_lock_irqsave(&ha->phy_port_lock, flags);
 987         for (i = 0; i < ha->num_phys; i++) {
 988                 struct asd_sas_port *port = ha->sas_port[i];
 989                 struct domain_device *dev;
 990
 991                 spin_lock(&port->dev_list_lock);
 992                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 993                         if (rphy == dev->rphy) {
 994                                 found_dev = dev;
 995                                 spin_unlock(&port->dev_list_lock);
 996                                 goto found;
 997                         }
 998                 }
 999                 spin_unlock(&port->dev_list_lock);
1000         }
1001  found:
1002         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
1003
1004         return found_dev;
1005 }
1006
1007 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
1008 {
1009         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
1010
1011         return sas_find_dev_by_rphy(rphy);
1012 }
1013
1014 int sas_target_alloc(struct scsi_target *starget)
1015 {
1016         struct Scsi_Host *shost = dev_to_shost(&starget->dev);
1017         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
1018         struct domain_device *found_dev = sas_find_target(starget);
1019
1020         if (!found_dev)
1021                 return -ENODEV;
1022
1023         if (dev_is_sata(found_dev)) {
1024                 struct ata_port *ap;
1025
1026                 ata_host_init(&found_dev->sata_dev.ata_host,
1027                               &ha->pcidev->dev,
1028                               sata_port_info.flags,
1029                               &sas_sata_ops);
1030                 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
1031                                         &sata_port_info,
1032                                         shost);
1033                 if (!ap) {
1034                         SAS_DPRINTK("ata_sas_port_alloc failed.\n");
1035                         return -ENODEV;
1036                 }
1037
1038                 ap->private_data = found_dev;
1039                 ap->cbl = ATA_CBL_SATA;
1040                 ap->scsi_host = shost;
1041                 found_dev->sata_dev.ap = ap;
1042         }
1043
1044         starget->hostdata = found_dev;
1045         return 0;
1046 }
1047
1048 #define SAS_DEF_QD 32
1049 #define SAS_MAX_QD 64
1050
1051 int sas_slave_configure(struct scsi_device *scsi_dev)
1052 {
1053         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1054         struct sas_ha_struct *sas_ha;
1055
1056         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
1057
1058         if (dev_is_sata(dev)) {
1059                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
1060                 return 0;
1061         }
1062
1063         sas_ha = dev->port->ha;
1064
1065         sas_read_port_mode_page(scsi_dev);
1066
1067         if (scsi_dev->tagged_supported) {
1068                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
1069                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
1070         } else {
1071                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
1072                             "TCQ\n", SAS_ADDR(dev->sas_addr),
1073                             scsi_dev->lun);
1074                 scsi_dev->tagged_supported = 0;
1075                 scsi_set_tag_type(scsi_dev, 0);
1076                 scsi_deactivate_tcq(scsi_dev, 1);
1077         }
1078
1079         scsi_dev->allow_restart = 1;
1080
1081         return 0;
1082 }
1083
1084 void sas_slave_destroy(struct scsi_device *scsi_dev)
1085 {
1086         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1087
1088         if (dev_is_sata(dev))
1089                 ata_port_disable(dev->sata_dev.ap);
1090 }
1091
1092 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
1093 {
1094         int res = min(new_depth, SAS_MAX_QD);
1095
1096         if (scsi_dev->tagged_supported)
1097                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
1098                                         res);
1099         else {
1100                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1101                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
1102                            SAS_ADDR(dev->sas_addr),
1103                            scsi_dev->lun);
1104                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
1105                 res = 1;
1106         }
1107
1108         return res;
1109 }
1110
1111 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
1112 {
1113         if (!scsi_dev->tagged_supported)
1114                 return 0;
1115
1116         scsi_deactivate_tcq(scsi_dev, 1);
1117
1118         scsi_set_tag_type(scsi_dev, qt);
1119         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
1120
1121         return qt;
1122 }
1123
1124 int sas_bios_param(struct scsi_device *scsi_dev,
1125                           struct block_device *bdev,
1126                           sector_t capacity, int *hsc)
1127 {
1128         hsc[0] = 255;
1129         hsc[1] = 63;
1130         sector_div(capacity, 255*63);
1131         hsc[2] = capacity;
1132
1133         return 0;
1134 }
1135
1136 /* ---------- Task Collector Thread implementation ---------- */
1137
1138 static void sas_queue(struct sas_ha_struct *sas_ha)
1139 {
1140         struct scsi_core *core = &sas_ha->core;
1141         unsigned long flags;
1142         LIST_HEAD(q);
1143         int can_queue;
1144         int res;
1145         struct sas_internal *i = to_sas_internal(core->shost->transportt);
1146
1147         spin_lock_irqsave(&core->task_queue_lock, flags);
1148         while (!kthread_should_stop() &&
1149                !list_empty(&core->task_queue)) {
1150
1151                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
1152                 if (can_queue >= 0) {
1153                         can_queue = core->task_queue_size;
1154                         list_splice_init(&core->task_queue, &q);
1155                 } else {
1156                         struct list_head *a, *n;
1157
1158                         can_queue = sas_ha->lldd_queue_size;
1159                         list_for_each_safe(a, n, &core->task_queue) {
1160                                 list_move_tail(a, &q);
1161                                 if (--can_queue == 0)
1162                                         break;
1163                         }
1164                         can_queue = sas_ha->lldd_queue_size;
1165                 }
1166                 core->task_queue_size -= can_queue;
1167                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
1168                 {
1169                         struct sas_task *task = list_entry(q.next,
1170                                                            struct sas_task,
1171                                                            list);
1172                         list_del_init(&q);
1173                         res = i->dft->lldd_execute_task(task, can_queue,
1174                                                         GFP_KERNEL);
1175                         if (unlikely(res))
1176                                 __list_add(&q, task->list.prev, &task->list);
1177                 }
1178                 spin_lock_irqsave(&core->task_queue_lock, flags);
1179                 if (res) {
1180                         list_splice_init(&q, &core->task_queue); /*at head*/
1181                         core->task_queue_size += can_queue;
1182                 }
1183         }
1184         spin_unlock_irqrestore(&core->task_queue_lock, flags);
1185 }
1186
1187 /**
1188  * sas_queue_thread -- The Task Collector thread
1189  * @_sas_ha: pointer to struct sas_ha
1190  */
1191 static int sas_queue_thread(void *_sas_ha)
1192 {
1193         struct sas_ha_struct *sas_ha = _sas_ha;
1194
1195         while (1) {
1196                 set_current_state(TASK_INTERRUPTIBLE);
1197                 schedule();
1198                 sas_queue(sas_ha);
1199                 if (kthread_should_stop())
1200                         break;
1201         }
1202
1203         return 0;
1204 }
1205
1206 int sas_init_queue(struct sas_ha_struct *sas_ha)
1207 {
1208         struct scsi_core *core = &sas_ha->core;
1209
1210         spin_lock_init(&core->task_queue_lock);
1211         core->task_queue_size = 0;
1212         INIT_LIST_HEAD(&core->task_queue);
1213
1214         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
1215                                          "sas_queue_%d", core->shost->host_no);
1216         if (IS_ERR(core->queue_thread))
1217                 return PTR_ERR(core->queue_thread);
1218         return 0;
1219 }
1220
1221 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
1222 {
1223         unsigned long flags;
1224         struct scsi_core *core = &sas_ha->core;
1225         struct sas_task *task, *n;
1226
1227         kthread_stop(core->queue_thread);
1228
1229         if (!list_empty(&core->task_queue))
1230                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
1231                             SAS_ADDR(sas_ha->sas_addr));
1232
1233         spin_lock_irqsave(&core->task_queue_lock, flags);
1234         list_for_each_entry_safe(task, n, &core->task_queue, list) {
1235                 struct scsi_cmnd *cmd = task->uldd_task;
1236
1237                 list_del_init(&task->list);
1238
1239                 ASSIGN_SAS_TASK(cmd, NULL);
1240                 sas_free_task(task);
1241                 cmd->result = DID_ABORT << 16;
1242                 cmd->scsi_done(cmd);
1243         }
1244         spin_unlock_irqrestore(&core->task_queue_lock, flags);
1245 }
1246
1247 /*
1248  * Call the LLDD task abort routine directly.  This function is intended for
1249  * use by upper layers that need to tell the LLDD to abort a task.
1250  */
1251 int __sas_task_abort(struct sas_task *task)
1252 {
1253         struct sas_internal *si =
1254                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
1255         unsigned long flags;
1256         int res;
1257
1258         spin_lock_irqsave(&task->task_state_lock, flags);
1259         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
1260             task->task_state_flags & SAS_TASK_STATE_DONE) {
1261                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1262                 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
1263                             task);
1264                 return 0;
1265         }
1266         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
1267         spin_unlock_irqrestore(&task->task_state_lock, flags);
1268
1269         if (!si->dft->lldd_abort_task)
1270                 return -ENODEV;
1271
1272         res = si->dft->lldd_abort_task(task);
1273
1274         spin_lock_irqsave(&task->task_state_lock, flags);
1275         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1276             (res == TMF_RESP_FUNC_COMPLETE))
1277         {
1278                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1279                 task->task_done(task);
1280                 return 0;
1281         }
1282
1283         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1284                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1285         spin_unlock_irqrestore(&task->task_state_lock, flags);
1286
1287         return -EAGAIN;
1288 }
1289
1290 /*
1291  * Tell an upper layer that it needs to initiate an abort for a given task.
1292  * This should only ever be called by an LLDD.
1293  */
1294 void sas_task_abort(struct sas_task *task)
1295 {
1296         struct scsi_cmnd *sc = task->uldd_task;
1297
1298         /* Escape for libsas internal commands */
1299         if (!sc) {
1300                 if (!del_timer(&task->timer))
1301                         return;
1302                 task->timer.function(task->timer.data);
1303                 return;
1304         }
1305
1306         scsi_req_abort_cmd(sc);
1307         scsi_schedule_eh(sc->device->host);
1308 }
1309
1310 int sas_slave_alloc(struct scsi_device *scsi_dev)
1311 {
1312         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1313
1314         if (dev_is_sata(dev))
1315                 return ata_sas_port_init(dev->sata_dev.ap);
1316
1317         return 0;
1318 }
1319
1320 void sas_target_destroy(struct scsi_target *starget)
1321 {
1322         struct domain_device *found_dev = sas_find_target(starget);
1323
1324         if (!found_dev)
1325                 return;
1326
1327         if (dev_is_sata(found_dev))
1328                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1329
1330         return;
1331 }
1332
1333 EXPORT_SYMBOL_GPL(sas_queuecommand);
1334 EXPORT_SYMBOL_GPL(sas_target_alloc);
1335 EXPORT_SYMBOL_GPL(sas_slave_configure);
1336 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1337 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1338 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1339 EXPORT_SYMBOL_GPL(sas_bios_param);
1340 EXPORT_SYMBOL_GPL(__sas_task_abort);
1341 EXPORT_SYMBOL_GPL(sas_task_abort);
1342 EXPORT_SYMBOL_GPL(sas_phy_reset);
1343 EXPORT_SYMBOL_GPL(sas_phy_enable);
1344 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1345 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1346 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1347 EXPORT_SYMBOL_GPL(sas_target_destroy);
1348 EXPORT_SYMBOL_GPL(sas_ioctl);