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->device->sdev_target == my_cmd->device->sdev_target &&
 284                     cmd->device->lun == my_cmd->device->lun)
 285                         sas_eh_finish_cmd(cmd);
 286         }
 287 }
 288
 289 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 290                                      struct domain_device *dev)
 291 {
 292         struct scsi_cmnd *cmd, *n;
 293
 294         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 295                 struct domain_device *x = cmd_to_domain_dev(cmd);
 296
 297                 if (x == dev)
 298                         sas_eh_finish_cmd(cmd);
 299         }
 300 }
 301
 302 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 303                                       struct asd_sas_port *port)
 304 {
 305         struct scsi_cmnd *cmd, *n;
 306
 307         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 308                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 309                 struct asd_sas_port *x = dev->port;
 310
 311                 if (x == port)
 312                         sas_eh_finish_cmd(cmd);
 313         }
 314 }
 315
 316 enum task_disposition {
 317         TASK_IS_DONE,
 318         TASK_IS_ABORTED,
 319         TASK_IS_AT_LU,
 320         TASK_IS_NOT_AT_LU,
 321         TASK_ABORT_FAILED,
 322 };
 323
 324 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 325 {
 326         struct sas_ha_struct *ha = task->dev->port->ha;
 327         unsigned long flags;
 328         int i, res;
 329         struct sas_internal *si =
 330                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 331
 332         if (ha->lldd_max_execute_num > 1) {
 333                 struct scsi_core *core = &ha->core;
 334                 struct sas_task *t, *n;
 335
 336                 spin_lock_irqsave(&core->task_queue_lock, flags);
 337                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 338                         if (task == t) {
 339                                 list_del_init(&t->list);
 340                                 spin_unlock_irqrestore(&core->task_queue_lock,
 341                                                        flags);
 342                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 343                                             "task_queue\n",
 344                                             __FUNCTION__, task);
 345                                 return TASK_IS_ABORTED;
 346                         }
 347                 }
 348                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 349         }
 350
 351         for (i = 0; i < 5; i++) {
 352                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 353                 res = si->dft->lldd_abort_task(task);
 354
 355                 spin_lock_irqsave(&task->task_state_lock, flags);
 356                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 357                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 358                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 359                                     task);
 360                         return TASK_IS_DONE;
 361                 }
 362                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 363
 364                 if (res == TMF_RESP_FUNC_COMPLETE) {
 365                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 366                                     __FUNCTION__, task);
 367                         return TASK_IS_ABORTED;
 368                 } else if (si->dft->lldd_query_task) {
 369                         SAS_DPRINTK("%s: querying task 0x%p\n",
 370                                     __FUNCTION__, task);
 371                         res = si->dft->lldd_query_task(task);
 372                         switch (res) {
 373                         case TMF_RESP_FUNC_SUCC:
 374                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 375                                             __FUNCTION__, task);
 376                                 return TASK_IS_AT_LU;
 377                         case TMF_RESP_FUNC_COMPLETE:
 378                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 379                                             __FUNCTION__, task);
 380                                 return TASK_IS_NOT_AT_LU;
 381                         case TMF_RESP_FUNC_FAILED:
 382                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 383                                                 __FUNCTION__, task);
 384                                 return TASK_ABORT_FAILED;
 385                         }
 386
 387                 }
 388         }
 389         return res;
 390 }
 391
 392 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 393 {
 394         int res = TMF_RESP_FUNC_FAILED;
 395         struct scsi_lun lun;
 396         struct sas_internal *i =
 397                 to_sas_internal(dev->port->ha->core.shost->transportt);
 398
 399         int_to_scsilun(cmd->device->lun, &lun);
 400
 401         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 402                     SAS_ADDR(dev->sas_addr),
 403                     cmd->device->lun);
 404
 405         if (i->dft->lldd_abort_task_set)
 406                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 407
 408         if (res == TMF_RESP_FUNC_FAILED) {
 409                 if (i->dft->lldd_clear_task_set)
 410                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 411         }
 412
 413         if (res == TMF_RESP_FUNC_FAILED) {
 414                 if (i->dft->lldd_lu_reset)
 415                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 416         }
 417
 418         return res;
 419 }
 420
 421 static int sas_recover_I_T(struct domain_device *dev)
 422 {
 423         int res = TMF_RESP_FUNC_FAILED;
 424         struct sas_internal *i =
 425                 to_sas_internal(dev->port->ha->core.shost->transportt);
 426
 427         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 428                     SAS_ADDR(dev->sas_addr));
 429
 430         if (i->dft->lldd_I_T_nexus_reset)
 431                 res = i->dft->lldd_I_T_nexus_reset(dev);
 432
 433         return res;
 434 }
 435
 436 /* Find the sas_phy that's attached to this device */
 437 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
 438 {
 439         struct domain_device *pdev = dev->parent;
 440         struct ex_phy *exphy = NULL;
 441         int i;
 442
 443         /* Directly attached device */
 444         if (!pdev)
 445                 return dev->port->phy;
 446
 447         /* Otherwise look in the expander */
 448         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 449                 if (!memcmp(dev->sas_addr,
 450                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 451                             SAS_ADDR_SIZE)) {
 452                         exphy = &pdev->ex_dev.ex_phy[i];
 453                         break;
 454                 }
 455
 456         BUG_ON(!exphy);
 457         return exphy->phy;
 458 }
 459 EXPORT_SYMBOL_GPL(sas_find_local_phy);
 460
 461 /* Attempt to send a LUN reset message to a device */
 462 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 463 {
 464         struct domain_device *dev = cmd_to_domain_dev(cmd);
 465         struct sas_internal *i =
 466                 to_sas_internal(dev->port->ha->core.shost->transportt);
 467         struct scsi_lun lun;
 468         int res;
 469
 470         int_to_scsilun(cmd->device->lun, &lun);
 471
 472         if (!i->dft->lldd_lu_reset)
 473                 return FAILED;
 474
 475         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 476         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 477                 return SUCCESS;
 478
 479         return FAILED;
 480 }
 481
 482 /* Attempt to send a phy (bus) reset */
 483 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 484 {
 485         struct domain_device *dev = cmd_to_domain_dev(cmd);
 486         struct sas_phy *phy = sas_find_local_phy(dev);
 487         int res;
 488
 489         res = sas_phy_reset(phy, 1);
 490         if (res)
 491                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 492                             kobject_name(&phy->dev.kobj),
 493                             res);
 494         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 495                 return SUCCESS;
 496
 497         return FAILED;
 498 }
 499
 500 /* Try to reset a device */
 501 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
 502 {
 503         int res;
 504         struct Scsi_Host *shost = cmd->device->host;
 505
 506         if (!shost->hostt->eh_device_reset_handler)
 507                 goto try_bus_reset;
 508
 509         res = shost->hostt->eh_device_reset_handler(cmd);
 510         if (res == SUCCESS)
 511                 return res;
 512
 513 try_bus_reset:
 514         if (shost->hostt->eh_bus_reset_handler)
 515                 return shost->hostt->eh_bus_reset_handler(cmd);
 516
 517         return FAILED;
 518 }
 519
 520 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 521                                     struct list_head *work_q,
 522                                     struct list_head *done_q)
 523 {
 524         struct scsi_cmnd *cmd, *n;
 525         enum task_disposition res = TASK_IS_DONE;
 526         int tmf_resp, need_reset;
 527         struct sas_internal *i = to_sas_internal(shost->transportt);
 528         unsigned long flags;
 529         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 530
 531 Again:
 532         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 533                 struct sas_task *task = TO_SAS_TASK(cmd);
 534
 535                 if (!task)
 536                         continue;
 537
 538                 list_del_init(&cmd->eh_entry);
 539
 540                 spin_lock_irqsave(&task->task_state_lock, flags);
 541                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 542                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 543
 544                 if (need_reset) {
 545                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
 546                                     __FUNCTION__, task);
 547                         goto reset;
 548                 }
 549
 550                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 551                 res = sas_scsi_find_task(task);
 552
 553                 cmd->eh_eflags = 0;
 554
 555                 switch (res) {
 556                 case TASK_IS_DONE:
 557                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 558                                     task);
 559                         sas_eh_finish_cmd(cmd);
 560                         continue;
 561                 case TASK_IS_ABORTED:
 562                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 563                                     __FUNCTION__, task);
 564                         sas_eh_finish_cmd(cmd);
 565                         continue;
 566                 case TASK_IS_AT_LU:
 567                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 568  reset:
 569                         tmf_resp = sas_recover_lu(task->dev, cmd);
 570                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 571                                 SAS_DPRINTK("dev %016llx LU %x is "
 572                                             "recovered\n",
 573                                             SAS_ADDR(task->dev),
 574                                             cmd->device->lun);
 575                                 sas_eh_finish_cmd(cmd);
 576                                 sas_scsi_clear_queue_lu(work_q, cmd);
 577                                 goto Again;
 578                         }
 579                         /* fallthrough */
 580                 case TASK_IS_NOT_AT_LU:
 581                 case TASK_ABORT_FAILED:
 582                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 583                                     task);
 584                         tmf_resp = sas_recover_I_T(task->dev);
 585                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 586                                 struct domain_device *dev = task->dev;
 587                                 SAS_DPRINTK("I_T %016llx recovered\n",
 588                                             SAS_ADDR(task->dev->sas_addr));
 589                                 sas_eh_finish_cmd(cmd);
 590                                 sas_scsi_clear_queue_I_T(work_q, dev);
 591                                 goto Again;
 592                         }
 593                         /* Hammer time :-) */
 594                         try_to_reset_cmd_device(cmd);
 595                         if (i->dft->lldd_clear_nexus_port) {
 596                                 struct asd_sas_port *port = task->dev->port;
 597                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 598                                             port->id);
 599                                 res = i->dft->lldd_clear_nexus_port(port);
 600                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 601                                         SAS_DPRINTK("clear nexus port:%d "
 602                                                     "succeeded\n", port->id);
 603                                         sas_eh_finish_cmd(cmd);
 604                                         sas_scsi_clear_queue_port(work_q,
 605                                                                   port);
 606                                         goto Again;
 607                                 }
 608                         }
 609                         if (i->dft->lldd_clear_nexus_ha) {
 610                                 SAS_DPRINTK("clear nexus ha\n");
 611                                 res = i->dft->lldd_clear_nexus_ha(ha);
 612                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 613                                         SAS_DPRINTK("clear nexus ha "
 614                                                     "succeeded\n");
 615                                         sas_eh_finish_cmd(cmd);
 616                                         goto clear_q;
 617                                 }
 618                         }
 619                         /* If we are here -- this means that no amount
 620                          * of effort could recover from errors.  Quite
 621                          * possibly the HA just disappeared.
 622                          */
 623                         SAS_DPRINTK("error from  device %llx, LUN %x "
 624                                     "couldn't be recovered in any way\n",
 625                                     SAS_ADDR(task->dev->sas_addr),
 626                                     cmd->device->lun);
 627
 628                         sas_eh_finish_cmd(cmd);
 629                         goto clear_q;
 630                 }
 631         }
 632         return list_empty(work_q);
 633 clear_q:
 634         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 635         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 636                 sas_eh_finish_cmd(cmd);
 637
 638         return list_empty(work_q);
 639 }
 640
 641 void sas_scsi_recover_host(struct Scsi_Host *shost)
 642 {
 643         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 644         unsigned long flags;
 645         LIST_HEAD(eh_work_q);
 646
 647         spin_lock_irqsave(shost->host_lock, flags);
 648         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 649         spin_unlock_irqrestore(shost->host_lock, flags);
 650
 651         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 652         /*
 653          * Deal with commands that still have SAS tasks (i.e. they didn't
 654          * complete via the normal sas_task completion mechanism)
 655          */
 656         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 657                 goto out;
 658
 659         /*
 660          * Now deal with SCSI commands that completed ok but have a an error
 661          * code (and hopefully sense data) attached.  This is roughly what
 662          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 663          * command we see here has no sas_task and is thus unknown to the HA.
 664          */
 665         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 666                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 667
 668 out:
 669         scsi_eh_flush_done_q(&ha->eh_done_q);
 670         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 671         return;
 672 }
 673
 674 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 675 {
 676         struct sas_task *task = TO_SAS_TASK(cmd);
 677         unsigned long flags;
 678
 679         if (!task) {
 680                 cmd->timeout_per_command /= 2;
 681                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 682                             cmd, task, (cmd->timeout_per_command ?
 683                             "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
 684                 if (!cmd->timeout_per_command)
 685                         return EH_NOT_HANDLED;
 686                 return EH_RESET_TIMER;
 687         }
 688
 689         spin_lock_irqsave(&task->task_state_lock, flags);
 690         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 691         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 692                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 693                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 694                             cmd, task);
 695                 return EH_HANDLED;
 696         }
 697         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 698                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 699                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 700                             "EH_RESET_TIMER\n",
 701                             cmd, task);
 702                 return EH_RESET_TIMER;
 703         }
 704         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 705         spin_unlock_irqrestore(&task->task_state_lock, flags);
 706
 707         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 708                     cmd, task);
 709
 710         return EH_NOT_HANDLED;
 711 }
 712
 713 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 714 {
 715         struct domain_device *dev = sdev_to_domain_dev(sdev);
 716
 717         if (dev_is_sata(dev))
 718                 return ata_scsi_ioctl(sdev, cmd, arg);
 719
 720         return -EINVAL;
 721 }
 722
 723 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 724 {
 725         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 726         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 727         struct domain_device *found_dev = NULL;
 728         int i;
 729         unsigned long flags;
 730
 731         spin_lock_irqsave(&ha->phy_port_lock, flags);
 732         for (i = 0; i < ha->num_phys; i++) {
 733                 struct asd_sas_port *port = ha->sas_port[i];
 734                 struct domain_device *dev;
 735
 736                 spin_lock(&port->dev_list_lock);
 737                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 738                         if (rphy == dev->rphy) {
 739                                 found_dev = dev;
 740                                 spin_unlock(&port->dev_list_lock);
 741                                 goto found;
 742                         }
 743                 }
 744                 spin_unlock(&port->dev_list_lock);
 745         }
 746  found:
 747         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 748
 749         return found_dev;
 750 }
 751
 752 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 753 {
 754         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 755
 756         return sas_find_dev_by_rphy(rphy);
 757 }
 758
 759 int sas_target_alloc(struct scsi_target *starget)
 760 {
 761         struct domain_device *found_dev = sas_find_target(starget);
 762         int res;
 763
 764         if (!found_dev)
 765                 return -ENODEV;
 766
 767         if (dev_is_sata(found_dev)) {
 768                 res = sas_ata_init_host_and_port(found_dev, starget);
 769                 if (res)
 770                         return res;
 771         }
 772
 773         starget->hostdata = found_dev;
 774         return 0;
 775 }
 776
 777 #define SAS_DEF_QD 32
 778 #define SAS_MAX_QD 64
 779
 780 int sas_slave_configure(struct scsi_device *scsi_dev)
 781 {
 782         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 783         struct sas_ha_struct *sas_ha;
 784
 785         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 786
 787         if (dev_is_sata(dev)) {
 788                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 789                 return 0;
 790         }
 791
 792         sas_ha = dev->port->ha;
 793
 794         sas_read_port_mode_page(scsi_dev);
 795
 796         if (scsi_dev->tagged_supported) {
 797                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 798                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 799         } else {
 800                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 801                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 802                             scsi_dev->lun);
 803                 scsi_dev->tagged_supported = 0;
 804                 scsi_set_tag_type(scsi_dev, 0);
 805                 scsi_deactivate_tcq(scsi_dev, 1);
 806         }
 807
 808         scsi_dev->allow_restart = 1;
 809
 810         return 0;
 811 }
 812
 813 void sas_slave_destroy(struct scsi_device *scsi_dev)
 814 {
 815         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 816
 817         if (dev_is_sata(dev))
 818                 ata_port_disable(dev->sata_dev.ap);
 819 }
 820
 821 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
 822 {
 823         int res = min(new_depth, SAS_MAX_QD);
 824
 825         if (scsi_dev->tagged_supported)
 826                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 827                                         res);
 828         else {
 829                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 830                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 831                            SAS_ADDR(dev->sas_addr),
 832                            scsi_dev->lun);
 833                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 834                 res = 1;
 835         }
 836
 837         return res;
 838 }
 839
 840 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 841 {
 842         if (!scsi_dev->tagged_supported)
 843                 return 0;
 844
 845         scsi_deactivate_tcq(scsi_dev, 1);
 846
 847         scsi_set_tag_type(scsi_dev, qt);
 848         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 849
 850         return qt;
 851 }
 852
 853 int sas_bios_param(struct scsi_device *scsi_dev,
 854                           struct block_device *bdev,
 855                           sector_t capacity, int *hsc)
 856 {
 857         hsc[0] = 255;
 858         hsc[1] = 63;
 859         sector_div(capacity, 255*63);
 860         hsc[2] = capacity;
 861
 862         return 0;
 863 }
 864
 865 /* ---------- Task Collector Thread implementation ---------- */
 866
 867 static void sas_queue(struct sas_ha_struct *sas_ha)
 868 {
 869         struct scsi_core *core = &sas_ha->core;
 870         unsigned long flags;
 871         LIST_HEAD(q);
 872         int can_queue;
 873         int res;
 874         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 875
 876         spin_lock_irqsave(&core->task_queue_lock, flags);
 877         while (!kthread_should_stop() &&
 878                !list_empty(&core->task_queue)) {
 879
 880                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 881                 if (can_queue >= 0) {
 882                         can_queue = core->task_queue_size;
 883                         list_splice_init(&core->task_queue, &q);
 884                 } else {
 885                         struct list_head *a, *n;
 886
 887                         can_queue = sas_ha->lldd_queue_size;
 888                         list_for_each_safe(a, n, &core->task_queue) {
 889                                 list_move_tail(a, &q);
 890                                 if (--can_queue == 0)
 891                                         break;
 892                         }
 893                         can_queue = sas_ha->lldd_queue_size;
 894                 }
 895                 core->task_queue_size -= can_queue;
 896                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 897                 {
 898                         struct sas_task *task = list_entry(q.next,
 899                                                            struct sas_task,
 900                                                            list);
 901                         list_del_init(&q);
 902                         res = i->dft->lldd_execute_task(task, can_queue,
 903                                                         GFP_KERNEL);
 904                         if (unlikely(res))
 905                                 __list_add(&q, task->list.prev, &task->list);
 906                 }
 907                 spin_lock_irqsave(&core->task_queue_lock, flags);
 908                 if (res) {
 909                         list_splice_init(&q, &core->task_queue); /*at head*/
 910                         core->task_queue_size += can_queue;
 911                 }
 912         }
 913         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 914 }
 915
 916 /**
 917  * sas_queue_thread -- The Task Collector thread
 918  * @_sas_ha: pointer to struct sas_ha
 919  */
 920 static int sas_queue_thread(void *_sas_ha)
 921 {
 922         struct sas_ha_struct *sas_ha = _sas_ha;
 923
 924         while (1) {
 925                 set_current_state(TASK_INTERRUPTIBLE);
 926                 schedule();
 927                 sas_queue(sas_ha);
 928                 if (kthread_should_stop())
 929                         break;
 930         }
 931
 932         return 0;
 933 }
 934
 935 int sas_init_queue(struct sas_ha_struct *sas_ha)
 936 {
 937         struct scsi_core *core = &sas_ha->core;
 938
 939         spin_lock_init(&core->task_queue_lock);
 940         core->task_queue_size = 0;
 941         INIT_LIST_HEAD(&core->task_queue);
 942
 943         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 944                                          "sas_queue_%d", core->shost->host_no);
 945         if (IS_ERR(core->queue_thread))
 946                 return PTR_ERR(core->queue_thread);
 947         return 0;
 948 }
 949
 950 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 951 {
 952         unsigned long flags;
 953         struct scsi_core *core = &sas_ha->core;
 954         struct sas_task *task, *n;
 955
 956         kthread_stop(core->queue_thread);
 957
 958         if (!list_empty(&core->task_queue))
 959                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 960                             SAS_ADDR(sas_ha->sas_addr));
 961
 962         spin_lock_irqsave(&core->task_queue_lock, flags);
 963         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 964                 struct scsi_cmnd *cmd = task->uldd_task;
 965
 966                 list_del_init(&task->list);
 967
 968                 ASSIGN_SAS_TASK(cmd, NULL);
 969                 sas_free_task(task);
 970                 cmd->result = DID_ABORT << 16;
 971                 cmd->scsi_done(cmd);
 972         }
 973         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 974 }
 975
 976 /*
 977  * Call the LLDD task abort routine directly.  This function is intended for
 978  * use by upper layers that need to tell the LLDD to abort a task.
 979  */
 980 int __sas_task_abort(struct sas_task *task)
 981 {
 982         struct sas_internal *si =
 983                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 984         unsigned long flags;
 985         int res;
 986
 987         spin_lock_irqsave(&task->task_state_lock, flags);
 988         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 989             task->task_state_flags & SAS_TASK_STATE_DONE) {
 990                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 991                 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
 992                             task);
 993                 return 0;
 994         }
 995         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 996         spin_unlock_irqrestore(&task->task_state_lock, flags);
 997
 998         if (!si->dft->lldd_abort_task)
 999                 return -ENODEV;
1000
1001         res = si->dft->lldd_abort_task(task);
1002
1003         spin_lock_irqsave(&task->task_state_lock, flags);
1004         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1005             (res == TMF_RESP_FUNC_COMPLETE))
1006         {
1007                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1008                 task->task_done(task);
1009                 return 0;
1010         }
1011
1012         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1013                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1014         spin_unlock_irqrestore(&task->task_state_lock, flags);
1015
1016         return -EAGAIN;
1017 }
1018
1019 /*
1020  * Tell an upper layer that it needs to initiate an abort for a given task.
1021  * This should only ever be called by an LLDD.
1022  */
1023 void sas_task_abort(struct sas_task *task)
1024 {
1025         struct scsi_cmnd *sc = task->uldd_task;
1026
1027         /* Escape for libsas internal commands */
1028         if (!sc) {
1029                 if (!del_timer(&task->timer))
1030                         return;
1031                 task->timer.function(task->timer.data);
1032                 return;
1033         }
1034
1035         if (dev_is_sata(task->dev)) {
1036                 sas_ata_task_abort(task);
1037                 return;
1038         }
1039
1040         scsi_req_abort_cmd(sc);
1041         scsi_schedule_eh(sc->device->host);
1042 }
1043
1044 int sas_slave_alloc(struct scsi_device *scsi_dev)
1045 {
1046         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1047
1048         if (dev_is_sata(dev))
1049                 return ata_sas_port_init(dev->sata_dev.ap);
1050
1051         return 0;
1052 }
1053
1054 void sas_target_destroy(struct scsi_target *starget)
1055 {
1056         struct domain_device *found_dev = sas_find_target(starget);
1057
1058         if (!found_dev)
1059                 return;
1060
1061         if (dev_is_sata(found_dev))
1062                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1063
1064         return;
1065 }
1066
1067 EXPORT_SYMBOL_GPL(sas_queuecommand);
1068 EXPORT_SYMBOL_GPL(sas_target_alloc);
1069 EXPORT_SYMBOL_GPL(sas_slave_configure);
1070 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1071 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1072 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1073 EXPORT_SYMBOL_GPL(sas_bios_param);
1074 EXPORT_SYMBOL_GPL(__sas_task_abort);
1075 EXPORT_SYMBOL_GPL(sas_task_abort);
1076 EXPORT_SYMBOL_GPL(sas_phy_reset);
1077 EXPORT_SYMBOL_GPL(sas_phy_enable);
1078 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1079 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1080 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1081 EXPORT_SYMBOL_GPL(sas_target_destroy);
1082 EXPORT_SYMBOL_GPL(sas_ioctl);