SAFE public projects git trees. - safe/jmp/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_ata.h>
  38 #include "../scsi_sas_internal.h"
  39 #include "../scsi_transport_api.h"
  40 #include "../scsi_priv.h"
  41
  42 #include <linux/err.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/freezer.h>
  45 #include <linux/scatterlist.h>
  46 #include <linux/libata.h>
  47
  48 /* ---------- SCSI Host glue ---------- */
  49
  50 static void sas_scsi_task_done(struct sas_task *task)
  51 {
  52         struct task_status_struct *ts = &task->task_status;
  53         struct scsi_cmnd *sc = task->uldd_task;
  54         int hs = 0, stat = 0;
  55
  56         if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
  57                 /* Aborted tasks will be completed by the error handler */
  58                 SAS_DPRINTK("task done but aborted\n");
  59                 return;
  60         }
  61
  62         if (unlikely(!sc)) {
  63                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  64                 list_del_init(&task->list);
  65                 sas_free_task(task);
  66                 return;
  67         }
  68
  69         if (ts->resp == SAS_TASK_UNDELIVERED) {
  70                 /* transport error */
  71                 hs = DID_NO_CONNECT;
  72         } else { /* ts->resp == SAS_TASK_COMPLETE */
  73                 /* task delivered, what happened afterwards? */
  74                 switch (ts->stat) {
  75                 case SAS_DEV_NO_RESPONSE:
  76                 case SAS_INTERRUPTED:
  77                 case SAS_PHY_DOWN:
  78                 case SAS_NAK_R_ERR:
  79                 case SAS_OPEN_TO:
  80                         hs = DID_NO_CONNECT;
  81                         break;
  82                 case SAS_DATA_UNDERRUN:
  83                         scsi_set_resid(sc, ts->residual);
  84                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  85                                 hs = DID_ERROR;
  86                         break;
  87                 case SAS_DATA_OVERRUN:
  88                         hs = DID_ERROR;
  89                         break;
  90                 case SAS_QUEUE_FULL:
  91                         hs = DID_SOFT_ERROR; /* retry */
  92                         break;
  93                 case SAS_DEVICE_UNKNOWN:
  94                         hs = DID_BAD_TARGET;
  95                         break;
  96                 case SAS_SG_ERR:
  97                         hs = DID_PARITY;
  98                         break;
  99                 case SAS_OPEN_REJECT:
 100                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
 101                                 hs = DID_SOFT_ERROR; /* retry */
 102                         else
 103                                 hs = DID_ERROR;
 104                         break;
 105                 case SAS_PROTO_RESPONSE:
 106                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
 107                                     "task; please report this\n",
 108                                     task->dev->port->ha->sas_ha_name);
 109                         break;
 110                 case SAS_ABORTED_TASK:
 111                         hs = DID_ABORT;
 112                         break;
 113                 case SAM_CHECK_COND:
 114                         memcpy(sc->sense_buffer, ts->buf,
 115                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 116                         stat = SAM_CHECK_COND;
 117                         break;
 118                 default:
 119                         stat = ts->stat;
 120                         break;
 121                 }
 122         }
 123         ASSIGN_SAS_TASK(sc, NULL);
 124         sc->result = (hs << 16) | stat;
 125         list_del_init(&task->list);
 126         sas_free_task(task);
 127         sc->scsi_done(sc);
 128 }
 129
 130 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
 131 {
 132         enum task_attribute ta = TASK_ATTR_SIMPLE;
 133         if (cmd->request && blk_rq_tagged(cmd->request)) {
 134                 if (cmd->device->ordered_tags &&
 135                     (cmd->request->cmd_flags & REQ_HARDBARRIER))
 136                         ta = TASK_ATTR_ORDERED;
 137         }
 138         return ta;
 139 }
 140
 141 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 142                                                struct domain_device *dev,
 143                                                gfp_t gfp_flags)
 144 {
 145         struct sas_task *task = sas_alloc_task(gfp_flags);
 146         struct scsi_lun lun;
 147
 148         if (!task)
 149                 return NULL;
 150
 151         task->uldd_task = cmd;
 152         ASSIGN_SAS_TASK(cmd, task);
 153
 154         task->dev = dev;
 155         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 156
 157         task->ssp_task.retry_count = 1;
 158         int_to_scsilun(cmd->device->lun, &lun);
 159         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 160         task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
 161         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 162
 163         task->scatter = scsi_sglist(cmd);
 164         task->num_scatter = scsi_sg_count(cmd);
 165         task->total_xfer_len = scsi_bufflen(cmd);
 166         task->data_dir = cmd->sc_data_direction;
 167
 168         task->task_done = sas_scsi_task_done;
 169
 170         return task;
 171 }
 172
 173 int sas_queue_up(struct sas_task *task)
 174 {
 175         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 176         struct scsi_core *core = &sas_ha->core;
 177         unsigned long flags;
 178         LIST_HEAD(list);
 179
 180         spin_lock_irqsave(&core->task_queue_lock, flags);
 181         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 182                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 183                 return -SAS_QUEUE_FULL;
 184         }
 185         list_add_tail(&task->list, &core->task_queue);
 186         core->task_queue_size += 1;
 187         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 188         wake_up_process(core->queue_thread);
 189
 190         return 0;
 191 }
 192
 193 /**
 194  * sas_queuecommand -- Enqueue a command for processing
 195  * @parameters: See SCSI Core documentation
 196  *
 197  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
 198  * call us without holding an IRQ spinlock...
 199  */
 200 int sas_queuecommand(struct scsi_cmnd *cmd,
 201                      void (*scsi_done)(struct scsi_cmnd *))
 202         __releases(host->host_lock)
 203         __acquires(dev->sata_dev.ap->lock)
 204         __releases(dev->sata_dev.ap->lock)
 205         __acquires(host->host_lock)
 206 {
 207         int res = 0;
 208         struct domain_device *dev = cmd_to_domain_dev(cmd);
 209         struct Scsi_Host *host = cmd->device->host;
 210         struct sas_internal *i = to_sas_internal(host->transportt);
 211
 212         spin_unlock_irq(host->host_lock);
 213
 214         {
 215                 struct sas_ha_struct *sas_ha = dev->port->ha;
 216                 struct sas_task *task;
 217
 218                 if (dev_is_sata(dev)) {
 219                         unsigned long flags;
 220
 221                         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 222                         res = ata_sas_queuecmd(cmd, scsi_done,
 223                                                dev->sata_dev.ap);
 224                         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 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_eh_finish_cmd(struct scsi_cmnd *cmd)
 259 {
 260         struct sas_task *task = TO_SAS_TASK(cmd);
 261         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
 262
 263         /* remove the aborted task flag to allow the task to be
 264          * completed now. At this point, we only get called following
 265          * an actual abort of the task, so we should be guaranteed not
 266          * to be racing with any completions from the LLD (hence we
 267          * don't need the task state lock to clear the flag) */
 268         task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 269         /* Now call task_done.  However, task will be free'd after
 270          * this */
 271         task->task_done(task);
 272         /* now finish the command and move it on to the error
 273          * handler done list, this also takes it off the
 274          * error handler pending list */
 275         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
 276 }
 277
 278 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 279 {
 280         struct scsi_cmnd *cmd, *n;
 281
 282         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 283                 if (cmd == my_cmd)
 284                         sas_eh_finish_cmd(cmd);
 285         }
 286 }
 287
 288 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 289                                      struct domain_device *dev)
 290 {
 291         struct scsi_cmnd *cmd, *n;
 292
 293         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 294                 struct domain_device *x = cmd_to_domain_dev(cmd);
 295
 296                 if (x == dev)
 297                         sas_eh_finish_cmd(cmd);
 298         }
 299 }
 300
 301 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 302                                       struct asd_sas_port *port)
 303 {
 304         struct scsi_cmnd *cmd, *n;
 305
 306         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 307                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 308                 struct asd_sas_port *x = dev->port;
 309
 310                 if (x == port)
 311                         sas_eh_finish_cmd(cmd);
 312         }
 313 }
 314
 315 enum task_disposition {
 316         TASK_IS_DONE,
 317         TASK_IS_ABORTED,
 318         TASK_IS_AT_LU,
 319         TASK_IS_NOT_AT_LU,
 320         TASK_ABORT_FAILED,
 321 };
 322
 323 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 324 {
 325         struct sas_ha_struct *ha = task->dev->port->ha;
 326         unsigned long flags;
 327         int i, res;
 328         struct sas_internal *si =
 329                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 330
 331         if (ha->lldd_max_execute_num > 1) {
 332                 struct scsi_core *core = &ha->core;
 333                 struct sas_task *t, *n;
 334
 335                 spin_lock_irqsave(&core->task_queue_lock, flags);
 336                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 337                         if (task == t) {
 338                                 list_del_init(&t->list);
 339                                 spin_unlock_irqrestore(&core->task_queue_lock,
 340                                                        flags);
 341                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 342                                             "task_queue\n",
 343                                             __FUNCTION__, task);
 344                                 return TASK_IS_ABORTED;
 345                         }
 346                 }
 347                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 348         }
 349
 350         for (i = 0; i < 5; i++) {
 351                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 352                 res = si->dft->lldd_abort_task(task);
 353
 354                 spin_lock_irqsave(&task->task_state_lock, flags);
 355                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 356                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 357                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 358                                     task);
 359                         return TASK_IS_DONE;
 360                 }
 361                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 362
 363                 if (res == TMF_RESP_FUNC_COMPLETE) {
 364                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 365                                     __FUNCTION__, task);
 366                         return TASK_IS_ABORTED;
 367                 } else if (si->dft->lldd_query_task) {
 368                         SAS_DPRINTK("%s: querying task 0x%p\n",
 369                                     __FUNCTION__, task);
 370                         res = si->dft->lldd_query_task(task);
 371                         switch (res) {
 372                         case TMF_RESP_FUNC_SUCC:
 373                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 374                                             __FUNCTION__, task);
 375                                 return TASK_IS_AT_LU;
 376                         case TMF_RESP_FUNC_COMPLETE:
 377                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 378                                             __FUNCTION__, task);
 379                                 return TASK_IS_NOT_AT_LU;
 380                         case TMF_RESP_FUNC_FAILED:
 381                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 382                                                 __FUNCTION__, task);
 383                                 return TASK_ABORT_FAILED;
 384                         }
 385
 386                 }
 387         }
 388         return res;
 389 }
 390
 391 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 392 {
 393         int res = TMF_RESP_FUNC_FAILED;
 394         struct scsi_lun lun;
 395         struct sas_internal *i =
 396                 to_sas_internal(dev->port->ha->core.shost->transportt);
 397
 398         int_to_scsilun(cmd->device->lun, &lun);
 399
 400         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 401                     SAS_ADDR(dev->sas_addr),
 402                     cmd->device->lun);
 403
 404         if (i->dft->lldd_abort_task_set)
 405                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 406
 407         if (res == TMF_RESP_FUNC_FAILED) {
 408                 if (i->dft->lldd_clear_task_set)
 409                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 410         }
 411
 412         if (res == TMF_RESP_FUNC_FAILED) {
 413                 if (i->dft->lldd_lu_reset)
 414                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 415         }
 416
 417         return res;
 418 }
 419
 420 static int sas_recover_I_T(struct domain_device *dev)
 421 {
 422         int res = TMF_RESP_FUNC_FAILED;
 423         struct sas_internal *i =
 424                 to_sas_internal(dev->port->ha->core.shost->transportt);
 425
 426         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 427                     SAS_ADDR(dev->sas_addr));
 428
 429         if (i->dft->lldd_I_T_nexus_reset)
 430                 res = i->dft->lldd_I_T_nexus_reset(dev);
 431
 432         return res;
 433 }
 434
 435 /* Find the sas_phy that's attached to this device */
 436 static struct sas_phy *find_local_sas_phy(struct domain_device *dev)
 437 {
 438         struct domain_device *pdev = dev->parent;
 439         struct ex_phy *exphy = NULL;
 440         int i;
 441
 442         /* Directly attached device */
 443         if (!pdev)
 444                 return dev->port->phy;
 445
 446         /* Otherwise look in the expander */
 447         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 448                 if (!memcmp(dev->sas_addr,
 449                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 450                             SAS_ADDR_SIZE)) {
 451                         exphy = &pdev->ex_dev.ex_phy[i];
 452                         break;
 453                 }
 454
 455         BUG_ON(!exphy);
 456         return exphy->phy;
 457 }
 458
 459 /* Attempt to send a LUN reset message to a device */
 460 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 461 {
 462         struct domain_device *dev = cmd_to_domain_dev(cmd);
 463         struct sas_internal *i =
 464                 to_sas_internal(dev->port->ha->core.shost->transportt);
 465         struct scsi_lun lun;
 466         int res;
 467
 468         int_to_scsilun(cmd->device->lun, &lun);
 469
 470         if (!i->dft->lldd_lu_reset)
 471                 return FAILED;
 472
 473         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 474         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 475                 return SUCCESS;
 476
 477         return FAILED;
 478 }
 479
 480 /* Attempt to send a phy (bus) reset */
 481 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 482 {
 483         struct domain_device *dev = cmd_to_domain_dev(cmd);
 484         struct sas_phy *phy = find_local_sas_phy(dev);
 485         int res;
 486
 487         res = sas_phy_reset(phy, 1);
 488         if (res)
 489                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 490                             kobject_name(&phy->dev.kobj),
 491                             res);
 492         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 493                 return SUCCESS;
 494
 495         return FAILED;
 496 }
 497
 498 /* Try to reset a device */
 499 static int try_to_reset_cmd_device(struct Scsi_Host *shost,
 500                                    struct scsi_cmnd *cmd)
 501 {
 502         int res;
 503
 504         if (!shost->hostt->eh_device_reset_handler)
 505                 goto try_bus_reset;
 506
 507         res = shost->hostt->eh_device_reset_handler(cmd);
 508         if (res == SUCCESS)
 509                 return res;
 510
 511 try_bus_reset:
 512         if (shost->hostt->eh_bus_reset_handler)
 513                 return shost->hostt->eh_bus_reset_handler(cmd);
 514
 515         return FAILED;
 516 }
 517
 518 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 519                                     struct list_head *work_q,
 520                                     struct list_head *done_q)
 521 {
 522         struct scsi_cmnd *cmd, *n;
 523         enum task_disposition res = TASK_IS_DONE;
 524         int tmf_resp, need_reset;
 525         struct sas_internal *i = to_sas_internal(shost->transportt);
 526         unsigned long flags;
 527         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 528
 529 Again:
 530         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 531                 struct sas_task *task = TO_SAS_TASK(cmd);
 532
 533                 if (!task)
 534                         continue;
 535
 536                 list_del_init(&cmd->eh_entry);
 537
 538                 spin_lock_irqsave(&task->task_state_lock, flags);
 539                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 540                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 541
 542                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 543                 res = sas_scsi_find_task(task);
 544
 545                 cmd->eh_eflags = 0;
 546
 547                 switch (res) {
 548                 case TASK_IS_DONE:
 549                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 550                                     task);
 551                         sas_eh_finish_cmd(cmd);
 552                         if (need_reset)
 553                                 try_to_reset_cmd_device(shost, cmd);
 554                         continue;
 555                 case TASK_IS_ABORTED:
 556                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 557                                     __FUNCTION__, task);
 558                         sas_eh_finish_cmd(cmd);
 559                         if (need_reset)
 560                                 try_to_reset_cmd_device(shost, cmd);
 561                         continue;
 562                 case TASK_IS_AT_LU:
 563                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 564                         tmf_resp = sas_recover_lu(task->dev, cmd);
 565                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 566                                 SAS_DPRINTK("dev %016llx LU %x is "
 567                                             "recovered\n",
 568                                             SAS_ADDR(task->dev),
 569                                             cmd->device->lun);
 570                                 sas_eh_finish_cmd(cmd);
 571                                 if (need_reset)
 572                                         try_to_reset_cmd_device(shost, cmd);
 573                                 sas_scsi_clear_queue_lu(work_q, cmd);
 574                                 goto Again;
 575                         }
 576                         /* fallthrough */
 577                 case TASK_IS_NOT_AT_LU:
 578                 case TASK_ABORT_FAILED:
 579                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 580                                     task);
 581                         tmf_resp = sas_recover_I_T(task->dev);
 582                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 583                                 SAS_DPRINTK("I_T %016llx recovered\n",
 584                                             SAS_ADDR(task->dev->sas_addr));
 585                                 sas_eh_finish_cmd(cmd);
 586                                 if (need_reset)
 587                                         try_to_reset_cmd_device(shost, cmd);
 588                                 sas_scsi_clear_queue_I_T(work_q, task->dev);
 589                                 goto Again;
 590                         }
 591                         /* Hammer time :-) */
 592                         if (i->dft->lldd_clear_nexus_port) {
 593                                 struct asd_sas_port *port = task->dev->port;
 594                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 595                                             port->id);
 596                                 res = i->dft->lldd_clear_nexus_port(port);
 597                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 598                                         SAS_DPRINTK("clear nexus port:%d "
 599                                                     "succeeded\n", port->id);
 600                                         sas_eh_finish_cmd(cmd);
 601                                         if (need_reset)
 602                                                 try_to_reset_cmd_device(shost, cmd);
 603                                         sas_scsi_clear_queue_port(work_q,
 604                                                                   port);
 605                                         goto Again;
 606                                 }
 607                         }
 608                         if (i->dft->lldd_clear_nexus_ha) {
 609                                 SAS_DPRINTK("clear nexus ha\n");
 610                                 res = i->dft->lldd_clear_nexus_ha(ha);
 611                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 612                                         SAS_DPRINTK("clear nexus ha "
 613                                                     "succeeded\n");
 614                                         sas_eh_finish_cmd(cmd);
 615                                         if (need_reset)
 616                                                 try_to_reset_cmd_device(shost, cmd);
 617                                         goto clear_q;
 618                                 }
 619                         }
 620                         /* If we are here -- this means that no amount
 621                          * of effort could recover from errors.  Quite
 622                          * possibly the HA just disappeared.
 623                          */
 624                         SAS_DPRINTK("error from  device %llx, LUN %x "
 625                                     "couldn't be recovered in any way\n",
 626                                     SAS_ADDR(task->dev->sas_addr),
 627                                     cmd->device->lun);
 628
 629                         sas_eh_finish_cmd(cmd);
 630                         if (need_reset)
 631                                 try_to_reset_cmd_device(shost, cmd);
 632                         goto clear_q;
 633                 }
 634         }
 635         return list_empty(work_q);
 636 clear_q:
 637         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 638         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 639                 sas_eh_finish_cmd(cmd);
 640
 641         return list_empty(work_q);
 642 }
 643
 644 void sas_scsi_recover_host(struct Scsi_Host *shost)
 645 {
 646         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 647         unsigned long flags;
 648         LIST_HEAD(eh_work_q);
 649
 650         spin_lock_irqsave(shost->host_lock, flags);
 651         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 652         spin_unlock_irqrestore(shost->host_lock, flags);
 653
 654         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 655         /*
 656          * Deal with commands that still have SAS tasks (i.e. they didn't
 657          * complete via the normal sas_task completion mechanism)
 658          */
 659         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 660                 goto out;
 661
 662         /*
 663          * Now deal with SCSI commands that completed ok but have a an error
 664          * code (and hopefully sense data) attached.  This is roughly what
 665          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 666          * command we see here has no sas_task and is thus unknown to the HA.
 667          */
 668         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 669                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 670
 671 out:
 672         scsi_eh_flush_done_q(&ha->eh_done_q);
 673         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 674         return;
 675 }
 676
 677 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 678 {
 679         struct sas_task *task = TO_SAS_TASK(cmd);
 680         unsigned long flags;
 681
 682         if (!task) {
 683                 cmd->timeout_per_command /= 2;
 684                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 685                             cmd, task, (cmd->timeout_per_command ?
 686                             "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
 687                 if (!cmd->timeout_per_command)
 688                         return EH_NOT_HANDLED;
 689                 return EH_RESET_TIMER;
 690         }
 691
 692         spin_lock_irqsave(&task->task_state_lock, flags);
 693         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 694         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 695                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 696                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 697                             cmd, task);
 698                 return EH_HANDLED;
 699         }
 700         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 701                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 702                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 703                             "EH_RESET_TIMER\n",
 704                             cmd, task);
 705                 return EH_RESET_TIMER;
 706         }
 707         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 708         spin_unlock_irqrestore(&task->task_state_lock, flags);
 709
 710         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 711                     cmd, task);
 712
 713         return EH_NOT_HANDLED;
 714 }
 715
 716 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 717 {
 718         struct domain_device *dev = sdev_to_domain_dev(sdev);
 719
 720         if (dev_is_sata(dev))
 721                 return ata_scsi_ioctl(sdev, cmd, arg);
 722
 723         return -EINVAL;
 724 }
 725
 726 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 727 {
 728         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 729         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 730         struct domain_device *found_dev = NULL;
 731         int i;
 732         unsigned long flags;
 733
 734         spin_lock_irqsave(&ha->phy_port_lock, flags);
 735         for (i = 0; i < ha->num_phys; i++) {
 736                 struct asd_sas_port *port = ha->sas_port[i];
 737                 struct domain_device *dev;
 738
 739                 spin_lock(&port->dev_list_lock);
 740                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 741                         if (rphy == dev->rphy) {
 742                                 found_dev = dev;
 743                                 spin_unlock(&port->dev_list_lock);
 744                                 goto found;
 745                         }
 746                 }
 747                 spin_unlock(&port->dev_list_lock);
 748         }
 749  found:
 750         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 751
 752         return found_dev;
 753 }
 754
 755 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 756 {
 757         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 758
 759         return sas_find_dev_by_rphy(rphy);
 760 }
 761
 762 int sas_target_alloc(struct scsi_target *starget)
 763 {
 764         struct domain_device *found_dev = sas_find_target(starget);
 765         int res;
 766
 767         if (!found_dev)
 768                 return -ENODEV;
 769
 770         if (dev_is_sata(found_dev)) {
 771                 res = sas_ata_init_host_and_port(found_dev, starget);
 772                 if (res)
 773                         return res;
 774         }
 775
 776         starget->hostdata = found_dev;
 777         return 0;
 778 }
 779
 780 #define SAS_DEF_QD 32
 781 #define SAS_MAX_QD 64
 782
 783 int sas_slave_configure(struct scsi_device *scsi_dev)
 784 {
 785         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 786         struct sas_ha_struct *sas_ha;
 787
 788         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 789
 790         if (dev_is_sata(dev)) {
 791                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 792                 return 0;
 793         }
 794
 795         sas_ha = dev->port->ha;
 796
 797         sas_read_port_mode_page(scsi_dev);
 798
 799         if (scsi_dev->tagged_supported) {
 800                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 801                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 802         } else {
 803                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 804                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 805                             scsi_dev->lun);
 806                 scsi_dev->tagged_supported = 0;
 807                 scsi_set_tag_type(scsi_dev, 0);
 808                 scsi_deactivate_tcq(scsi_dev, 1);
 809         }
 810
 811         scsi_dev->allow_restart = 1;
 812
 813         return 0;
 814 }
 815
 816 void sas_slave_destroy(struct scsi_device *scsi_dev)
 817 {
 818         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 819
 820         if (dev_is_sata(dev))
 821                 ata_port_disable(dev->sata_dev.ap);
 822 }
 823
 824 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
 825 {
 826         int res = min(new_depth, SAS_MAX_QD);
 827
 828         if (scsi_dev->tagged_supported)
 829                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 830                                         res);
 831         else {
 832                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 833                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 834                            SAS_ADDR(dev->sas_addr),
 835                            scsi_dev->lun);
 836                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 837                 res = 1;
 838         }
 839
 840         return res;
 841 }
 842
 843 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 844 {
 845         if (!scsi_dev->tagged_supported)
 846                 return 0;
 847
 848         scsi_deactivate_tcq(scsi_dev, 1);
 849
 850         scsi_set_tag_type(scsi_dev, qt);
 851         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 852
 853         return qt;
 854 }
 855
 856 int sas_bios_param(struct scsi_device *scsi_dev,
 857                           struct block_device *bdev,
 858                           sector_t capacity, int *hsc)
 859 {
 860         hsc[0] = 255;
 861         hsc[1] = 63;
 862         sector_div(capacity, 255*63);
 863         hsc[2] = capacity;
 864
 865         return 0;
 866 }
 867
 868 /* ---------- Task Collector Thread implementation ---------- */
 869
 870 static void sas_queue(struct sas_ha_struct *sas_ha)
 871 {
 872         struct scsi_core *core = &sas_ha->core;
 873         unsigned long flags;
 874         LIST_HEAD(q);
 875         int can_queue;
 876         int res;
 877         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 878
 879         spin_lock_irqsave(&core->task_queue_lock, flags);
 880         while (!kthread_should_stop() &&
 881                !list_empty(&core->task_queue)) {
 882
 883                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 884                 if (can_queue >= 0) {
 885                         can_queue = core->task_queue_size;
 886                         list_splice_init(&core->task_queue, &q);
 887                 } else {
 888                         struct list_head *a, *n;
 889
 890                         can_queue = sas_ha->lldd_queue_size;
 891                         list_for_each_safe(a, n, &core->task_queue) {
 892                                 list_move_tail(a, &q);
 893                                 if (--can_queue == 0)
 894                                         break;
 895                         }
 896                         can_queue = sas_ha->lldd_queue_size;
 897                 }
 898                 core->task_queue_size -= can_queue;
 899                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 900                 {
 901                         struct sas_task *task = list_entry(q.next,
 902                                                            struct sas_task,
 903                                                            list);
 904                         list_del_init(&q);
 905                         res = i->dft->lldd_execute_task(task, can_queue,
 906                                                         GFP_KERNEL);
 907                         if (unlikely(res))
 908                                 __list_add(&q, task->list.prev, &task->list);
 909                 }
 910                 spin_lock_irqsave(&core->task_queue_lock, flags);
 911                 if (res) {
 912                         list_splice_init(&q, &core->task_queue); /*at head*/
 913                         core->task_queue_size += can_queue;
 914                 }
 915         }
 916         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 917 }
 918
 919 /**
 920  * sas_queue_thread -- The Task Collector thread
 921  * @_sas_ha: pointer to struct sas_ha
 922  */
 923 static int sas_queue_thread(void *_sas_ha)
 924 {
 925         struct sas_ha_struct *sas_ha = _sas_ha;
 926
 927         while (1) {
 928                 set_current_state(TASK_INTERRUPTIBLE);
 929                 schedule();
 930                 sas_queue(sas_ha);
 931                 if (kthread_should_stop())
 932                         break;
 933         }
 934
 935         return 0;
 936 }
 937
 938 int sas_init_queue(struct sas_ha_struct *sas_ha)
 939 {
 940         struct scsi_core *core = &sas_ha->core;
 941
 942         spin_lock_init(&core->task_queue_lock);
 943         core->task_queue_size = 0;
 944         INIT_LIST_HEAD(&core->task_queue);
 945
 946         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 947                                          "sas_queue_%d", core->shost->host_no);
 948         if (IS_ERR(core->queue_thread))
 949                 return PTR_ERR(core->queue_thread);
 950         return 0;
 951 }
 952
 953 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 954 {
 955         unsigned long flags;
 956         struct scsi_core *core = &sas_ha->core;
 957         struct sas_task *task, *n;
 958
 959         kthread_stop(core->queue_thread);
 960
 961         if (!list_empty(&core->task_queue))
 962                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 963                             SAS_ADDR(sas_ha->sas_addr));
 964
 965         spin_lock_irqsave(&core->task_queue_lock, flags);
 966         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 967                 struct scsi_cmnd *cmd = task->uldd_task;
 968
 969                 list_del_init(&task->list);
 970
 971                 ASSIGN_SAS_TASK(cmd, NULL);
 972                 sas_free_task(task);
 973                 cmd->result = DID_ABORT << 16;
 974                 cmd->scsi_done(cmd);
 975         }
 976         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 977 }
 978
 979 /*
 980  * Call the LLDD task abort routine directly.  This function is intended for
 981  * use by upper layers that need to tell the LLDD to abort a task.
 982  */
 983 int __sas_task_abort(struct sas_task *task)
 984 {
 985         struct sas_internal *si =
 986                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 987         unsigned long flags;
 988         int res;
 989
 990         spin_lock_irqsave(&task->task_state_lock, flags);
 991         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 992             task->task_state_flags & SAS_TASK_STATE_DONE) {
 993                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 994                 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
 995                             task);
 996                 return 0;
 997         }
 998         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 999         spin_unlock_irqrestore(&task->task_state_lock, flags);
1000
1001         if (!si->dft->lldd_abort_task)
1002                 return -ENODEV;
1003
1004         res = si->dft->lldd_abort_task(task);
1005
1006         spin_lock_irqsave(&task->task_state_lock, flags);
1007         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1008             (res == TMF_RESP_FUNC_COMPLETE))
1009         {
1010                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1011                 task->task_done(task);
1012                 return 0;
1013         }
1014
1015         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1016                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1017         spin_unlock_irqrestore(&task->task_state_lock, flags);
1018
1019         return -EAGAIN;
1020 }
1021
1022 /*
1023  * Tell an upper layer that it needs to initiate an abort for a given task.
1024  * This should only ever be called by an LLDD.
1025  */
1026 void sas_task_abort(struct sas_task *task)
1027 {
1028         struct scsi_cmnd *sc = task->uldd_task;
1029
1030         /* Escape for libsas internal commands */
1031         if (!sc) {
1032                 if (!del_timer(&task->timer))
1033                         return;
1034                 task->timer.function(task->timer.data);
1035                 return;
1036         }
1037
1038         if (dev_is_sata(task->dev)) {
1039                 sas_ata_task_abort(task);
1040                 return;
1041         }
1042
1043         scsi_req_abort_cmd(sc);
1044         scsi_schedule_eh(sc->device->host);
1045 }
1046
1047 int sas_slave_alloc(struct scsi_device *scsi_dev)
1048 {
1049         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1050
1051         if (dev_is_sata(dev))
1052                 return ata_sas_port_init(dev->sata_dev.ap);
1053
1054         return 0;
1055 }
1056
1057 void sas_target_destroy(struct scsi_target *starget)
1058 {
1059         struct domain_device *found_dev = sas_find_target(starget);
1060
1061         if (!found_dev)
1062                 return;
1063
1064         if (dev_is_sata(found_dev))
1065                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1066
1067         return;
1068 }
1069
1070 EXPORT_SYMBOL_GPL(sas_queuecommand);
1071 EXPORT_SYMBOL_GPL(sas_target_alloc);
1072 EXPORT_SYMBOL_GPL(sas_slave_configure);
1073 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1074 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1075 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1076 EXPORT_SYMBOL_GPL(sas_bios_param);
1077 EXPORT_SYMBOL_GPL(__sas_task_abort);
1078 EXPORT_SYMBOL_GPL(sas_task_abort);
1079 EXPORT_SYMBOL_GPL(sas_phy_reset);
1080 EXPORT_SYMBOL_GPL(sas_phy_enable);
1081 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1082 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1083 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1084 EXPORT_SYMBOL_GPL(sas_target_destroy);
1085 EXPORT_SYMBOL_GPL(sas_ioctl);