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 static struct sas_phy *find_local_sas_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
 460 /* Attempt to send a LUN reset message to a device */
 461 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 462 {
 463         struct domain_device *dev = cmd_to_domain_dev(cmd);
 464         struct sas_internal *i =
 465                 to_sas_internal(dev->port->ha->core.shost->transportt);
 466         struct scsi_lun lun;
 467         int res;
 468
 469         int_to_scsilun(cmd->device->lun, &lun);
 470
 471         if (!i->dft->lldd_lu_reset)
 472                 return FAILED;
 473
 474         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 475         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 476                 return SUCCESS;
 477
 478         return FAILED;
 479 }
 480
 481 /* Attempt to send a phy (bus) reset */
 482 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 483 {
 484         struct domain_device *dev = cmd_to_domain_dev(cmd);
 485         struct sas_phy *phy = find_local_sas_phy(dev);
 486         int res;
 487
 488         res = sas_phy_reset(phy, 1);
 489         if (res)
 490                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 491                             kobject_name(&phy->dev.kobj),
 492                             res);
 493         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 494                 return SUCCESS;
 495
 496         return FAILED;
 497 }
 498
 499 /* Try to reset a device */
 500 static int try_to_reset_cmd_device(struct Scsi_Host *shost,
 501                                    struct scsi_cmnd *cmd)
 502 {
 503         int res;
 504
 505         if (!shost->hostt->eh_device_reset_handler)
 506                 goto try_bus_reset;
 507
 508         res = shost->hostt->eh_device_reset_handler(cmd);
 509         if (res == SUCCESS)
 510                 return res;
 511
 512 try_bus_reset:
 513         if (shost->hostt->eh_bus_reset_handler)
 514                 return shost->hostt->eh_bus_reset_handler(cmd);
 515
 516         return FAILED;
 517 }
 518
 519 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 520                                     struct list_head *work_q,
 521                                     struct list_head *done_q)
 522 {
 523         struct scsi_cmnd *cmd, *n;
 524         enum task_disposition res = TASK_IS_DONE;
 525         int tmf_resp, need_reset;
 526         struct sas_internal *i = to_sas_internal(shost->transportt);
 527         unsigned long flags;
 528         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 529
 530 Again:
 531         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 532                 struct sas_task *task = TO_SAS_TASK(cmd);
 533
 534                 if (!task)
 535                         continue;
 536
 537                 list_del_init(&cmd->eh_entry);
 538
 539                 spin_lock_irqsave(&task->task_state_lock, flags);
 540                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 541                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 542
 543                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 544                 res = sas_scsi_find_task(task);
 545
 546                 cmd->eh_eflags = 0;
 547
 548                 switch (res) {
 549                 case TASK_IS_DONE:
 550                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 551                                     task);
 552                         sas_eh_finish_cmd(cmd);
 553                         if (need_reset)
 554                                 try_to_reset_cmd_device(shost, cmd);
 555                         continue;
 556                 case TASK_IS_ABORTED:
 557                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 558                                     __FUNCTION__, task);
 559                         sas_eh_finish_cmd(cmd);
 560                         if (need_reset)
 561                                 try_to_reset_cmd_device(shost, cmd);
 562                         continue;
 563                 case TASK_IS_AT_LU:
 564                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 565                         tmf_resp = sas_recover_lu(task->dev, cmd);
 566                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 567                                 SAS_DPRINTK("dev %016llx LU %x is "
 568                                             "recovered\n",
 569                                             SAS_ADDR(task->dev),
 570                                             cmd->device->lun);
 571                                 sas_eh_finish_cmd(cmd);
 572                                 if (need_reset)
 573                                         try_to_reset_cmd_device(shost, cmd);
 574                                 sas_scsi_clear_queue_lu(work_q, cmd);
 575                                 goto Again;
 576                         }
 577                         /* fallthrough */
 578                 case TASK_IS_NOT_AT_LU:
 579                 case TASK_ABORT_FAILED:
 580                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 581                                     task);
 582                         tmf_resp = sas_recover_I_T(task->dev);
 583                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 584                                 SAS_DPRINTK("I_T %016llx recovered\n",
 585                                             SAS_ADDR(task->dev->sas_addr));
 586                                 sas_eh_finish_cmd(cmd);
 587                                 if (need_reset)
 588                                         try_to_reset_cmd_device(shost, cmd);
 589                                 sas_scsi_clear_queue_I_T(work_q, task->dev);
 590                                 goto Again;
 591                         }
 592                         /* Hammer time :-) */
 593                         if (i->dft->lldd_clear_nexus_port) {
 594                                 struct asd_sas_port *port = task->dev->port;
 595                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 596                                             port->id);
 597                                 res = i->dft->lldd_clear_nexus_port(port);
 598                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 599                                         SAS_DPRINTK("clear nexus port:%d "
 600                                                     "succeeded\n", port->id);
 601                                         sas_eh_finish_cmd(cmd);
 602                                         if (need_reset)
 603                                                 try_to_reset_cmd_device(shost, 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                                         if (need_reset)
 617                                                 try_to_reset_cmd_device(shost, cmd);
 618                                         goto clear_q;
 619                                 }
 620                         }
 621                         /* If we are here -- this means that no amount
 622                          * of effort could recover from errors.  Quite
 623                          * possibly the HA just disappeared.
 624                          */
 625                         SAS_DPRINTK("error from  device %llx, LUN %x "
 626                                     "couldn't be recovered in any way\n",
 627                                     SAS_ADDR(task->dev->sas_addr),
 628                                     cmd->device->lun);
 629
 630                         sas_eh_finish_cmd(cmd);
 631                         if (need_reset)
 632                                 try_to_reset_cmd_device(shost, cmd);
 633                         goto clear_q;
 634                 }
 635         }
 636         return list_empty(work_q);
 637 clear_q:
 638         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 639         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 640                 sas_eh_finish_cmd(cmd);
 641
 642         return list_empty(work_q);
 643 }
 644
 645 void sas_scsi_recover_host(struct Scsi_Host *shost)
 646 {
 647         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 648         unsigned long flags;
 649         LIST_HEAD(eh_work_q);
 650
 651         spin_lock_irqsave(shost->host_lock, flags);
 652         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 653         spin_unlock_irqrestore(shost->host_lock, flags);
 654
 655         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 656         /*
 657          * Deal with commands that still have SAS tasks (i.e. they didn't
 658          * complete via the normal sas_task completion mechanism)
 659          */
 660         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 661                 goto out;
 662
 663         /*
 664          * Now deal with SCSI commands that completed ok but have a an error
 665          * code (and hopefully sense data) attached.  This is roughly what
 666          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 667          * command we see here has no sas_task and is thus unknown to the HA.
 668          */
 669         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 670                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 671
 672 out:
 673         scsi_eh_flush_done_q(&ha->eh_done_q);
 674         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 675         return;
 676 }
 677
 678 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 679 {
 680         struct sas_task *task = TO_SAS_TASK(cmd);
 681         unsigned long flags;
 682
 683         if (!task) {
 684                 cmd->timeout_per_command /= 2;
 685                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 686                             cmd, task, (cmd->timeout_per_command ?
 687                             "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
 688                 if (!cmd->timeout_per_command)
 689                         return EH_NOT_HANDLED;
 690                 return EH_RESET_TIMER;
 691         }
 692
 693         spin_lock_irqsave(&task->task_state_lock, flags);
 694         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 695         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 696                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 697                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 698                             cmd, task);
 699                 return EH_HANDLED;
 700         }
 701         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 702                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 703                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 704                             "EH_RESET_TIMER\n",
 705                             cmd, task);
 706                 return EH_RESET_TIMER;
 707         }
 708         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 709         spin_unlock_irqrestore(&task->task_state_lock, flags);
 710
 711         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 712                     cmd, task);
 713
 714         return EH_NOT_HANDLED;
 715 }
 716
 717 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 718 {
 719         struct domain_device *dev = sdev_to_domain_dev(sdev);
 720
 721         if (dev_is_sata(dev))
 722                 return ata_scsi_ioctl(sdev, cmd, arg);
 723
 724         return -EINVAL;
 725 }
 726
 727 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 728 {
 729         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 730         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 731         struct domain_device *found_dev = NULL;
 732         int i;
 733         unsigned long flags;
 734
 735         spin_lock_irqsave(&ha->phy_port_lock, flags);
 736         for (i = 0; i < ha->num_phys; i++) {
 737                 struct asd_sas_port *port = ha->sas_port[i];
 738                 struct domain_device *dev;
 739
 740                 spin_lock(&port->dev_list_lock);
 741                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 742                         if (rphy == dev->rphy) {
 743                                 found_dev = dev;
 744                                 spin_unlock(&port->dev_list_lock);
 745                                 goto found;
 746                         }
 747                 }
 748                 spin_unlock(&port->dev_list_lock);
 749         }
 750  found:
 751         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 752
 753         return found_dev;
 754 }
 755
 756 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 757 {
 758         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 759
 760         return sas_find_dev_by_rphy(rphy);
 761 }
 762
 763 int sas_target_alloc(struct scsi_target *starget)
 764 {
 765         struct domain_device *found_dev = sas_find_target(starget);
 766         int res;
 767
 768         if (!found_dev)
 769                 return -ENODEV;
 770
 771         if (dev_is_sata(found_dev)) {
 772                 res = sas_ata_init_host_and_port(found_dev, starget);
 773                 if (res)
 774                         return res;
 775         }
 776
 777         starget->hostdata = found_dev;
 778         return 0;
 779 }
 780
 781 #define SAS_DEF_QD 32
 782 #define SAS_MAX_QD 64
 783
 784 int sas_slave_configure(struct scsi_device *scsi_dev)
 785 {
 786         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 787         struct sas_ha_struct *sas_ha;
 788
 789         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 790
 791         if (dev_is_sata(dev)) {
 792                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 793                 return 0;
 794         }
 795
 796         sas_ha = dev->port->ha;
 797
 798         sas_read_port_mode_page(scsi_dev);
 799
 800         if (scsi_dev->tagged_supported) {
 801                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 802                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 803         } else {
 804                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 805                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 806                             scsi_dev->lun);
 807                 scsi_dev->tagged_supported = 0;
 808                 scsi_set_tag_type(scsi_dev, 0);
 809                 scsi_deactivate_tcq(scsi_dev, 1);
 810         }
 811
 812         scsi_dev->allow_restart = 1;
 813
 814         return 0;
 815 }
 816
 817 void sas_slave_destroy(struct scsi_device *scsi_dev)
 818 {
 819         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 820
 821         if (dev_is_sata(dev))
 822                 ata_port_disable(dev->sata_dev.ap);
 823 }
 824
 825 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
 826 {
 827         int res = min(new_depth, SAS_MAX_QD);
 828
 829         if (scsi_dev->tagged_supported)
 830                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 831                                         res);
 832         else {
 833                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 834                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 835                            SAS_ADDR(dev->sas_addr),
 836                            scsi_dev->lun);
 837                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 838                 res = 1;
 839         }
 840
 841         return res;
 842 }
 843
 844 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 845 {
 846         if (!scsi_dev->tagged_supported)
 847                 return 0;
 848
 849         scsi_deactivate_tcq(scsi_dev, 1);
 850
 851         scsi_set_tag_type(scsi_dev, qt);
 852         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 853
 854         return qt;
 855 }
 856
 857 int sas_bios_param(struct scsi_device *scsi_dev,
 858                           struct block_device *bdev,
 859                           sector_t capacity, int *hsc)
 860 {
 861         hsc[0] = 255;
 862         hsc[1] = 63;
 863         sector_div(capacity, 255*63);
 864         hsc[2] = capacity;
 865
 866         return 0;
 867 }
 868
 869 /* ---------- Task Collector Thread implementation ---------- */
 870
 871 static void sas_queue(struct sas_ha_struct *sas_ha)
 872 {
 873         struct scsi_core *core = &sas_ha->core;
 874         unsigned long flags;
 875         LIST_HEAD(q);
 876         int can_queue;
 877         int res;
 878         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 879
 880         spin_lock_irqsave(&core->task_queue_lock, flags);
 881         while (!kthread_should_stop() &&
 882                !list_empty(&core->task_queue)) {
 883
 884                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 885                 if (can_queue >= 0) {
 886                         can_queue = core->task_queue_size;
 887                         list_splice_init(&core->task_queue, &q);
 888                 } else {
 889                         struct list_head *a, *n;
 890
 891                         can_queue = sas_ha->lldd_queue_size;
 892                         list_for_each_safe(a, n, &core->task_queue) {
 893                                 list_move_tail(a, &q);
 894                                 if (--can_queue == 0)
 895                                         break;
 896                         }
 897                         can_queue = sas_ha->lldd_queue_size;
 898                 }
 899                 core->task_queue_size -= can_queue;
 900                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 901                 {
 902                         struct sas_task *task = list_entry(q.next,
 903                                                            struct sas_task,
 904                                                            list);
 905                         list_del_init(&q);
 906                         res = i->dft->lldd_execute_task(task, can_queue,
 907                                                         GFP_KERNEL);
 908                         if (unlikely(res))
 909                                 __list_add(&q, task->list.prev, &task->list);
 910                 }
 911                 spin_lock_irqsave(&core->task_queue_lock, flags);
 912                 if (res) {
 913                         list_splice_init(&q, &core->task_queue); /*at head*/
 914                         core->task_queue_size += can_queue;
 915                 }
 916         }
 917         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 918 }
 919
 920 /**
 921  * sas_queue_thread -- The Task Collector thread
 922  * @_sas_ha: pointer to struct sas_ha
 923  */
 924 static int sas_queue_thread(void *_sas_ha)
 925 {
 926         struct sas_ha_struct *sas_ha = _sas_ha;
 927
 928         while (1) {
 929                 set_current_state(TASK_INTERRUPTIBLE);
 930                 schedule();
 931                 sas_queue(sas_ha);
 932                 if (kthread_should_stop())
 933                         break;
 934         }
 935
 936         return 0;
 937 }
 938
 939 int sas_init_queue(struct sas_ha_struct *sas_ha)
 940 {
 941         struct scsi_core *core = &sas_ha->core;
 942
 943         spin_lock_init(&core->task_queue_lock);
 944         core->task_queue_size = 0;
 945         INIT_LIST_HEAD(&core->task_queue);
 946
 947         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 948                                          "sas_queue_%d", core->shost->host_no);
 949         if (IS_ERR(core->queue_thread))
 950                 return PTR_ERR(core->queue_thread);
 951         return 0;
 952 }
 953
 954 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 955 {
 956         unsigned long flags;
 957         struct scsi_core *core = &sas_ha->core;
 958         struct sas_task *task, *n;
 959
 960         kthread_stop(core->queue_thread);
 961
 962         if (!list_empty(&core->task_queue))
 963                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 964                             SAS_ADDR(sas_ha->sas_addr));
 965
 966         spin_lock_irqsave(&core->task_queue_lock, flags);
 967         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 968                 struct scsi_cmnd *cmd = task->uldd_task;
 969
 970                 list_del_init(&task->list);
 971
 972                 ASSIGN_SAS_TASK(cmd, NULL);
 973                 sas_free_task(task);
 974                 cmd->result = DID_ABORT << 16;
 975                 cmd->scsi_done(cmd);
 976         }
 977         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 978 }
 979
 980 /*
 981  * Call the LLDD task abort routine directly.  This function is intended for
 982  * use by upper layers that need to tell the LLDD to abort a task.
 983  */
 984 int __sas_task_abort(struct sas_task *task)
 985 {
 986         struct sas_internal *si =
 987                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 988         unsigned long flags;
 989         int res;
 990
 991         spin_lock_irqsave(&task->task_state_lock, flags);
 992         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 993             task->task_state_flags & SAS_TASK_STATE_DONE) {
 994                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 995                 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
 996                             task);
 997                 return 0;
 998         }
 999         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
1000         spin_unlock_irqrestore(&task->task_state_lock, flags);
1001
1002         if (!si->dft->lldd_abort_task)
1003                 return -ENODEV;
1004
1005         res = si->dft->lldd_abort_task(task);
1006
1007         spin_lock_irqsave(&task->task_state_lock, flags);
1008         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1009             (res == TMF_RESP_FUNC_COMPLETE))
1010         {
1011                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1012                 task->task_done(task);
1013                 return 0;
1014         }
1015
1016         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1017                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1018         spin_unlock_irqrestore(&task->task_state_lock, flags);
1019
1020         return -EAGAIN;
1021 }
1022
1023 /*
1024  * Tell an upper layer that it needs to initiate an abort for a given task.
1025  * This should only ever be called by an LLDD.
1026  */
1027 void sas_task_abort(struct sas_task *task)
1028 {
1029         struct scsi_cmnd *sc = task->uldd_task;
1030
1031         /* Escape for libsas internal commands */
1032         if (!sc) {
1033                 if (!del_timer(&task->timer))
1034                         return;
1035                 task->timer.function(task->timer.data);
1036                 return;
1037         }
1038
1039         if (dev_is_sata(task->dev)) {
1040                 sas_ata_task_abort(task);
1041                 return;
1042         }
1043
1044         scsi_req_abort_cmd(sc);
1045         scsi_schedule_eh(sc->device->host);
1046 }
1047
1048 int sas_slave_alloc(struct scsi_device *scsi_dev)
1049 {
1050         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1051
1052         if (dev_is_sata(dev))
1053                 return ata_sas_port_init(dev->sata_dev.ap);
1054
1055         return 0;
1056 }
1057
1058 void sas_target_destroy(struct scsi_target *starget)
1059 {
1060         struct domain_device *found_dev = sas_find_target(starget);
1061
1062         if (!found_dev)
1063                 return;
1064
1065         if (dev_is_sata(found_dev))
1066                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1067
1068         return;
1069 }
1070
1071 EXPORT_SYMBOL_GPL(sas_queuecommand);
1072 EXPORT_SYMBOL_GPL(sas_target_alloc);
1073 EXPORT_SYMBOL_GPL(sas_slave_configure);
1074 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1075 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1076 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1077 EXPORT_SYMBOL_GPL(sas_bios_param);
1078 EXPORT_SYMBOL_GPL(__sas_task_abort);
1079 EXPORT_SYMBOL_GPL(sas_task_abort);
1080 EXPORT_SYMBOL_GPL(sas_phy_reset);
1081 EXPORT_SYMBOL_GPL(sas_phy_enable);
1082 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1083 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1084 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1085 EXPORT_SYMBOL_GPL(sas_target_destroy);
1086 EXPORT_SYMBOL_GPL(sas_ioctl);