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 #include <linux/firmware.h>
  28 #include <linux/export.h>
  29 #include <linux/ctype.h>
  30
  31 #include "sas_internal.h"
  32
  33 #include <scsi/scsi_host.h>
  34 #include <scsi/scsi_device.h>
  35 #include <scsi/scsi_tcq.h>
  36 #include <scsi/scsi.h>
  37 #include <scsi/scsi_eh.h>
  38 #include <scsi/scsi_transport.h>
  39 #include <scsi/scsi_transport_sas.h>
  40 #include <scsi/sas_ata.h>
  41 #include "../scsi_sas_internal.h"
  42 #include "../scsi_transport_api.h"
  43 #include "../scsi_priv.h"
  44
  45 #include <linux/err.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/freezer.h>
  48 #include <linux/gfp.h>
  49 #include <linux/scatterlist.h>
  50 #include <linux/libata.h>
  51
  52 /* record final status and free the task */
  53 static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
  54 {
  55         struct task_status_struct *ts = &task->task_status;
  56         int hs = 0, stat = 0;
  57
  58         if (ts->resp == SAS_TASK_UNDELIVERED) {
  59                 /* transport error */
  60                 hs = DID_NO_CONNECT;
  61         } else { /* ts->resp == SAS_TASK_COMPLETE */
  62                 /* task delivered, what happened afterwards? */
  63                 switch (ts->stat) {
  64                 case SAS_DEV_NO_RESPONSE:
  65                 case SAS_INTERRUPTED:
  66                 case SAS_PHY_DOWN:
  67                 case SAS_NAK_R_ERR:
  68                 case SAS_OPEN_TO:
  69                         hs = DID_NO_CONNECT;
  70                         break;
  71                 case SAS_DATA_UNDERRUN:
  72                         scsi_set_resid(sc, ts->residual);
  73                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  74                                 hs = DID_ERROR;
  75                         break;
  76                 case SAS_DATA_OVERRUN:
  77                         hs = DID_ERROR;
  78                         break;
  79                 case SAS_QUEUE_FULL:
  80                         hs = DID_SOFT_ERROR; /* retry */
  81                         break;
  82                 case SAS_DEVICE_UNKNOWN:
  83                         hs = DID_BAD_TARGET;
  84                         break;
  85                 case SAS_SG_ERR:
  86                         hs = DID_PARITY;
  87                         break;
  88                 case SAS_OPEN_REJECT:
  89                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
  90                                 hs = DID_SOFT_ERROR; /* retry */
  91                         else
  92                                 hs = DID_ERROR;
  93                         break;
  94                 case SAS_PROTO_RESPONSE:
  95                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
  96                                     "task; please report this\n",
  97                                     task->dev->port->ha->sas_ha_name);
  98                         break;
  99                 case SAS_ABORTED_TASK:
 100                         hs = DID_ABORT;
 101                         break;
 102                 case SAM_STAT_CHECK_CONDITION:
 103                         memcpy(sc->sense_buffer, ts->buf,
 104                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 105                         stat = SAM_STAT_CHECK_CONDITION;
 106                         break;
 107                 default:
 108                         stat = ts->stat;
 109                         break;
 110                 }
 111         }
 112
 113         sc->result = (hs << 16) | stat;
 114         ASSIGN_SAS_TASK(sc, NULL);
 115         sas_free_task(task);
 116 }
 117
 118 static void sas_scsi_task_done(struct sas_task *task)
 119 {
 120         struct scsi_cmnd *sc = task->uldd_task;
 121         struct domain_device *dev = task->dev;
 122         struct sas_ha_struct *ha = dev->port->ha;
 123         unsigned long flags;
 124
 125         spin_lock_irqsave(&dev->done_lock, flags);
 126         if (test_bit(SAS_HA_FROZEN, &ha->state))
 127                 task = NULL;
 128         else
 129                 ASSIGN_SAS_TASK(sc, NULL);
 130         spin_unlock_irqrestore(&dev->done_lock, flags);
 131
 132         if (unlikely(!task)) {
 133                 /* task will be completed by the error handler */
 134                 SAS_DPRINTK("task done but aborted\n");
 135                 return;
 136         }
 137
 138         if (unlikely(!sc)) {
 139                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
 140                 sas_free_task(task);
 141                 return;
 142         }
 143
 144         sas_end_task(sc, task);
 145         sc->scsi_done(sc);
 146 }
 147
 148 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 149                                                struct domain_device *dev,
 150                                                gfp_t gfp_flags)
 151 {
 152         struct sas_task *task = sas_alloc_task(gfp_flags);
 153         struct scsi_lun lun;
 154
 155         if (!task)
 156                 return NULL;
 157
 158         task->uldd_task = cmd;
 159         ASSIGN_SAS_TASK(cmd, task);
 160
 161         task->dev = dev;
 162         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 163
 164         task->ssp_task.retry_count = 1;
 165         int_to_scsilun(cmd->device->lun, &lun);
 166         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 167         task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
 168         task->ssp_task.cmd = cmd;
 169
 170         task->scatter = scsi_sglist(cmd);
 171         task->num_scatter = scsi_sg_count(cmd);
 172         task->total_xfer_len = scsi_bufflen(cmd);
 173         task->data_dir = cmd->sc_data_direction;
 174
 175         task->task_done = sas_scsi_task_done;
 176
 177         return task;
 178 }
 179
 180 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 181 {
 182         struct sas_internal *i = to_sas_internal(host->transportt);
 183         struct domain_device *dev = cmd_to_domain_dev(cmd);
 184         struct sas_task *task;
 185         int res = 0;
 186
 187         /* If the device fell off, no sense in issuing commands */
 188         if (test_bit(SAS_DEV_GONE, &dev->state)) {
 189                 cmd->result = DID_BAD_TARGET << 16;
 190                 goto out_done;
 191         }
 192
 193         if (dev_is_sata(dev)) {
 194                 spin_lock_irq(dev->sata_dev.ap->lock);
 195                 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
 196                 spin_unlock_irq(dev->sata_dev.ap->lock);
 197                 return res;
 198         }
 199
 200         task = sas_create_task(cmd, dev, GFP_ATOMIC);
 201         if (!task)
 202                 return SCSI_MLQUEUE_HOST_BUSY;
 203
 204         res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
 205         if (res)
 206                 goto out_free_task;
 207         return 0;
 208
 209 out_free_task:
 210         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 211         ASSIGN_SAS_TASK(cmd, NULL);
 212         sas_free_task(task);
 213         if (res == -SAS_QUEUE_FULL)
 214                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 215         else
 216                 cmd->result = DID_ERROR << 16;
 217 out_done:
 218         cmd->scsi_done(cmd);
 219         return 0;
 220 }
 221
 222 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
 223 {
 224         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
 225         struct domain_device *dev = cmd_to_domain_dev(cmd);
 226         struct sas_task *task = TO_SAS_TASK(cmd);
 227
 228         /* At this point, we only get called following an actual abort
 229          * of the task, so we should be guaranteed not to be racing with
 230          * any completions from the LLD.  Task is freed after this.
 231          */
 232         sas_end_task(cmd, task);
 233
 234         if (dev_is_sata(dev)) {
 235                 /* defer commands to libata so that libata EH can
 236                  * handle ata qcs correctly
 237                  */
 238                 list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
 239                 return;
 240         }
 241
 242         /* now finish the command and move it on to the error
 243          * handler done list, this also takes it off the
 244          * error handler pending list.
 245          */
 246         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
 247 }
 248
 249 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 250 {
 251         struct scsi_cmnd *cmd, *n;
 252
 253         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 254                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
 255                     cmd->device->lun == my_cmd->device->lun)
 256                         sas_eh_finish_cmd(cmd);
 257         }
 258 }
 259
 260 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 261                                      struct domain_device *dev)
 262 {
 263         struct scsi_cmnd *cmd, *n;
 264
 265         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 266                 struct domain_device *x = cmd_to_domain_dev(cmd);
 267
 268                 if (x == dev)
 269                         sas_eh_finish_cmd(cmd);
 270         }
 271 }
 272
 273 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 274                                       struct asd_sas_port *port)
 275 {
 276         struct scsi_cmnd *cmd, *n;
 277
 278         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 279                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 280                 struct asd_sas_port *x = dev->port;
 281
 282                 if (x == port)
 283                         sas_eh_finish_cmd(cmd);
 284         }
 285 }
 286
 287 enum task_disposition {
 288         TASK_IS_DONE,
 289         TASK_IS_ABORTED,
 290         TASK_IS_AT_LU,
 291         TASK_IS_NOT_AT_LU,
 292         TASK_ABORT_FAILED,
 293 };
 294
 295 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 296 {
 297         unsigned long flags;
 298         int i, res;
 299         struct sas_internal *si =
 300                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 301
 302         for (i = 0; i < 5; i++) {
 303                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
 304                 res = si->dft->lldd_abort_task(task);
 305
 306                 spin_lock_irqsave(&task->task_state_lock, flags);
 307                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 308                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 309                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 310                                     task);
 311                         return TASK_IS_DONE;
 312                 }
 313                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 314
 315                 if (res == TMF_RESP_FUNC_COMPLETE) {
 316                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 317                                     __func__, task);
 318                         return TASK_IS_ABORTED;
 319                 } else if (si->dft->lldd_query_task) {
 320                         SAS_DPRINTK("%s: querying task 0x%p\n",
 321                                     __func__, task);
 322                         res = si->dft->lldd_query_task(task);
 323                         switch (res) {
 324                         case TMF_RESP_FUNC_SUCC:
 325                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 326                                             __func__, task);
 327                                 return TASK_IS_AT_LU;
 328                         case TMF_RESP_FUNC_COMPLETE:
 329                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 330                                             __func__, task);
 331                                 return TASK_IS_NOT_AT_LU;
 332                         case TMF_RESP_FUNC_FAILED:
 333                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 334                                                 __func__, task);
 335                                 return TASK_ABORT_FAILED;
 336                         }
 337
 338                 }
 339         }
 340         return res;
 341 }
 342
 343 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 344 {
 345         int res = TMF_RESP_FUNC_FAILED;
 346         struct scsi_lun lun;
 347         struct sas_internal *i =
 348                 to_sas_internal(dev->port->ha->core.shost->transportt);
 349
 350         int_to_scsilun(cmd->device->lun, &lun);
 351
 352         SAS_DPRINTK("eh: device %llx LUN %llx has the task\n",
 353                     SAS_ADDR(dev->sas_addr),
 354                     cmd->device->lun);
 355
 356         if (i->dft->lldd_abort_task_set)
 357                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 358
 359         if (res == TMF_RESP_FUNC_FAILED) {
 360                 if (i->dft->lldd_clear_task_set)
 361                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 362         }
 363
 364         if (res == TMF_RESP_FUNC_FAILED) {
 365                 if (i->dft->lldd_lu_reset)
 366                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 367         }
 368
 369         return res;
 370 }
 371
 372 static int sas_recover_I_T(struct domain_device *dev)
 373 {
 374         int res = TMF_RESP_FUNC_FAILED;
 375         struct sas_internal *i =
 376                 to_sas_internal(dev->port->ha->core.shost->transportt);
 377
 378         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 379                     SAS_ADDR(dev->sas_addr));
 380
 381         if (i->dft->lldd_I_T_nexus_reset)
 382                 res = i->dft->lldd_I_T_nexus_reset(dev);
 383
 384         return res;
 385 }
 386
 387 /* take a reference on the last known good phy for this device */
 388 struct sas_phy *sas_get_local_phy(struct domain_device *dev)
 389 {
 390         struct sas_ha_struct *ha = dev->port->ha;
 391         struct sas_phy *phy;
 392         unsigned long flags;
 393
 394         /* a published domain device always has a valid phy, it may be
 395          * stale, but it is never NULL
 396          */
 397         BUG_ON(!dev->phy);
 398
 399         spin_lock_irqsave(&ha->phy_port_lock, flags);
 400         phy = dev->phy;
 401         get_device(&phy->dev);
 402         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 403
 404         return phy;
 405 }
 406 EXPORT_SYMBOL_GPL(sas_get_local_phy);
 407
 408 static void sas_wait_eh(struct domain_device *dev)
 409 {
 410         struct sas_ha_struct *ha = dev->port->ha;
 411         DEFINE_WAIT(wait);
 412
 413         if (dev_is_sata(dev)) {
 414                 ata_port_wait_eh(dev->sata_dev.ap);
 415                 return;
 416         }
 417  retry:
 418         spin_lock_irq(&ha->lock);
 419
 420         while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
 421                 prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
 422                 spin_unlock_irq(&ha->lock);
 423                 schedule();
 424                 spin_lock_irq(&ha->lock);
 425         }
 426         finish_wait(&ha->eh_wait_q, &wait);
 427
 428         spin_unlock_irq(&ha->lock);
 429
 430         /* make sure SCSI EH is complete */
 431         if (scsi_host_in_recovery(ha->core.shost)) {
 432                 msleep(10);
 433                 goto retry;
 434         }
 435 }
 436 EXPORT_SYMBOL(sas_wait_eh);
 437
 438 static int sas_queue_reset(struct domain_device *dev, int reset_type,
 439                            u64 lun, int wait)
 440 {
 441         struct sas_ha_struct *ha = dev->port->ha;
 442         int scheduled = 0, tries = 100;
 443
 444         /* ata: promote lun reset to bus reset */
 445         if (dev_is_sata(dev)) {
 446                 sas_ata_schedule_reset(dev);
 447                 if (wait)
 448                         sas_ata_wait_eh(dev);
 449                 return SUCCESS;
 450         }
 451
 452         while (!scheduled && tries--) {
 453                 spin_lock_irq(&ha->lock);
 454                 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
 455                     !test_bit(reset_type, &dev->state)) {
 456                         scheduled = 1;
 457                         ha->eh_active++;
 458                         list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
 459                         set_bit(SAS_DEV_EH_PENDING, &dev->state);
 460                         set_bit(reset_type, &dev->state);
 461                         int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
 462                         scsi_schedule_eh(ha->core.shost);
 463                 }
 464                 spin_unlock_irq(&ha->lock);
 465
 466                 if (wait)
 467                         sas_wait_eh(dev);
 468
 469                 if (scheduled)
 470                         return SUCCESS;
 471         }
 472
 473         SAS_DPRINTK("%s reset of %s failed\n",
 474                     reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
 475                     dev_name(&dev->rphy->dev));
 476
 477         return FAILED;
 478 }
 479
 480 int sas_eh_abort_handler(struct scsi_cmnd *cmd)
 481 {
 482         int res;
 483         struct sas_task *task = TO_SAS_TASK(cmd);
 484         struct Scsi_Host *host = cmd->device->host;
 485         struct sas_internal *i = to_sas_internal(host->transportt);
 486
 487         if (current != host->ehandler)
 488                 return FAILED;
 489
 490         if (!i->dft->lldd_abort_task)
 491                 return FAILED;
 492
 493         res = i->dft->lldd_abort_task(task);
 494         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 495                 return SUCCESS;
 496
 497         return FAILED;
 498 }
 499 EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
 500
 501 /* Attempt to send a LUN reset message to a device */
 502 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 503 {
 504         int res;
 505         struct scsi_lun lun;
 506         struct Scsi_Host *host = cmd->device->host;
 507         struct domain_device *dev = cmd_to_domain_dev(cmd);
 508         struct sas_internal *i = to_sas_internal(host->transportt);
 509
 510         if (current != host->ehandler)
 511                 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
 512
 513         int_to_scsilun(cmd->device->lun, &lun);
 514
 515         if (!i->dft->lldd_lu_reset)
 516                 return FAILED;
 517
 518         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 519         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 520                 return SUCCESS;
 521
 522         return FAILED;
 523 }
 524
 525 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 526 {
 527         int res;
 528         struct Scsi_Host *host = cmd->device->host;
 529         struct domain_device *dev = cmd_to_domain_dev(cmd);
 530         struct sas_internal *i = to_sas_internal(host->transportt);
 531
 532         if (current != host->ehandler)
 533                 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
 534
 535         if (!i->dft->lldd_I_T_nexus_reset)
 536                 return FAILED;
 537
 538         res = i->dft->lldd_I_T_nexus_reset(dev);
 539         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
 540             res == -ENODEV)
 541                 return SUCCESS;
 542
 543         return FAILED;
 544 }
 545
 546 /* Try to reset a device */
 547 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
 548 {
 549         int res;
 550         struct Scsi_Host *shost = cmd->device->host;
 551
 552         if (!shost->hostt->eh_device_reset_handler)
 553                 goto try_bus_reset;
 554
 555         res = shost->hostt->eh_device_reset_handler(cmd);
 556         if (res == SUCCESS)
 557                 return res;
 558
 559 try_bus_reset:
 560         if (shost->hostt->eh_bus_reset_handler)
 561                 return shost->hostt->eh_bus_reset_handler(cmd);
 562
 563         return FAILED;
 564 }
 565
 566 static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
 567 {
 568         struct scsi_cmnd *cmd, *n;
 569         enum task_disposition res = TASK_IS_DONE;
 570         int tmf_resp, need_reset;
 571         struct sas_internal *i = to_sas_internal(shost->transportt);
 572         unsigned long flags;
 573         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 574         LIST_HEAD(done);
 575
 576         /* clean out any commands that won the completion vs eh race */
 577         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 578                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 579                 struct sas_task *task;
 580
 581                 spin_lock_irqsave(&dev->done_lock, flags);
 582                 /* by this point the lldd has either observed
 583                  * SAS_HA_FROZEN and is leaving the task alone, or has
 584                  * won the race with eh and decided to complete it
 585                  */
 586                 task = TO_SAS_TASK(cmd);
 587                 spin_unlock_irqrestore(&dev->done_lock, flags);
 588
 589                 if (!task)
 590                         list_move_tail(&cmd->eh_entry, &done);
 591         }
 592
 593  Again:
 594         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 595                 struct sas_task *task = TO_SAS_TASK(cmd);
 596
 597                 list_del_init(&cmd->eh_entry);
 598
 599                 spin_lock_irqsave(&task->task_state_lock, flags);
 600                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 601                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 602
 603                 if (need_reset) {
 604                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
 605                                     __func__, task);
 606                         goto reset;
 607                 }
 608
 609                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 610                 res = sas_scsi_find_task(task);
 611
 612                 cmd->eh_eflags = 0;
 613
 614                 switch (res) {
 615                 case TASK_IS_DONE:
 616                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 617                                     task);
 618                         sas_eh_finish_cmd(cmd);
 619                         continue;
 620                 case TASK_IS_ABORTED:
 621                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 622                                     __func__, task);
 623                         sas_eh_finish_cmd(cmd);
 624                         continue;
 625                 case TASK_IS_AT_LU:
 626                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 627  reset:
 628                         tmf_resp = sas_recover_lu(task->dev, cmd);
 629                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 630                                 SAS_DPRINTK("dev %016llx LU %llx is "
 631                                             "recovered\n",
 632                                             SAS_ADDR(task->dev),
 633                                             cmd->device->lun);
 634                                 sas_eh_finish_cmd(cmd);
 635                                 sas_scsi_clear_queue_lu(work_q, cmd);
 636                                 goto Again;
 637                         }
 638                         /* fallthrough */
 639                 case TASK_IS_NOT_AT_LU:
 640                 case TASK_ABORT_FAILED:
 641                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 642                                     task);
 643                         tmf_resp = sas_recover_I_T(task->dev);
 644                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
 645                             tmf_resp == -ENODEV) {
 646                                 struct domain_device *dev = task->dev;
 647                                 SAS_DPRINTK("I_T %016llx recovered\n",
 648                                             SAS_ADDR(task->dev->sas_addr));
 649                                 sas_eh_finish_cmd(cmd);
 650                                 sas_scsi_clear_queue_I_T(work_q, dev);
 651                                 goto Again;
 652                         }
 653                         /* Hammer time :-) */
 654                         try_to_reset_cmd_device(cmd);
 655                         if (i->dft->lldd_clear_nexus_port) {
 656                                 struct asd_sas_port *port = task->dev->port;
 657                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 658                                             port->id);
 659                                 res = i->dft->lldd_clear_nexus_port(port);
 660                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 661                                         SAS_DPRINTK("clear nexus port:%d "
 662                                                     "succeeded\n", port->id);
 663                                         sas_eh_finish_cmd(cmd);
 664                                         sas_scsi_clear_queue_port(work_q,
 665                                                                   port);
 666                                         goto Again;
 667                                 }
 668                         }
 669                         if (i->dft->lldd_clear_nexus_ha) {
 670                                 SAS_DPRINTK("clear nexus ha\n");
 671                                 res = i->dft->lldd_clear_nexus_ha(ha);
 672                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 673                                         SAS_DPRINTK("clear nexus ha "
 674                                                     "succeeded\n");
 675                                         sas_eh_finish_cmd(cmd);
 676                                         goto clear_q;
 677                                 }
 678                         }
 679                         /* If we are here -- this means that no amount
 680                          * of effort could recover from errors.  Quite
 681                          * possibly the HA just disappeared.
 682                          */
 683                         SAS_DPRINTK("error from  device %llx, LUN %llx "
 684                                     "couldn't be recovered in any way\n",
 685                                     SAS_ADDR(task->dev->sas_addr),
 686                                     cmd->device->lun);
 687
 688                         sas_eh_finish_cmd(cmd);
 689                         goto clear_q;
 690                 }
 691         }
 692  out:
 693         list_splice_tail(&done, work_q);
 694         list_splice_tail_init(&ha->eh_ata_q, work_q);
 695         return;
 696
 697  clear_q:
 698         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
 699         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 700                 sas_eh_finish_cmd(cmd);
 701         goto out;
 702 }
 703
 704 static void sas_eh_handle_resets(struct Scsi_Host *shost)
 705 {
 706         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 707         struct sas_internal *i = to_sas_internal(shost->transportt);
 708
 709         /* handle directed resets to sas devices */
 710         spin_lock_irq(&ha->lock);
 711         while (!list_empty(&ha->eh_dev_q)) {
 712                 struct domain_device *dev;
 713                 struct ssp_device *ssp;
 714
 715                 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
 716                 list_del_init(&ssp->eh_list_node);
 717                 dev = container_of(ssp, typeof(*dev), ssp_dev);
 718                 kref_get(&dev->kref);
 719                 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
 720
 721                 spin_unlock_irq(&ha->lock);
 722
 723                 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
 724                         i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
 725
 726                 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
 727                         i->dft->lldd_I_T_nexus_reset(dev);
 728
 729                 sas_put_device(dev);
 730                 spin_lock_irq(&ha->lock);
 731                 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
 732                 ha->eh_active--;
 733         }
 734         spin_unlock_irq(&ha->lock);
 735 }
 736
 737
 738 void sas_scsi_recover_host(struct Scsi_Host *shost)
 739 {
 740         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 741         LIST_HEAD(eh_work_q);
 742         int tries = 0;
 743         bool retry;
 744
 745 retry:
 746         tries++;
 747         retry = true;
 748         spin_lock_irq(shost->host_lock);
 749         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 750         spin_unlock_irq(shost->host_lock);
 751
 752         SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
 753                     __func__, atomic_read(&shost->host_busy), shost->host_failed);
 754         /*
 755          * Deal with commands that still have SAS tasks (i.e. they didn't
 756          * complete via the normal sas_task completion mechanism),
 757          * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
 758          */
 759         set_bit(SAS_HA_FROZEN, &ha->state);
 760         sas_eh_handle_sas_errors(shost, &eh_work_q);
 761         clear_bit(SAS_HA_FROZEN, &ha->state);
 762         if (list_empty(&eh_work_q))
 763                 goto out;
 764
 765         /*
 766          * Now deal with SCSI commands that completed ok but have a an error
 767          * code (and hopefully sense data) attached.  This is roughly what
 768          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 769          * command we see here has no sas_task and is thus unknown to the HA.
 770          */
 771         sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
 772         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 773                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 774
 775 out:
 776         sas_eh_handle_resets(shost);
 777
 778         /* now link into libata eh --- if we have any ata devices */
 779         sas_ata_strategy_handler(shost);
 780
 781         scsi_eh_flush_done_q(&ha->eh_done_q);
 782
 783         /* check if any new eh work was scheduled during the last run */
 784         spin_lock_irq(&ha->lock);
 785         if (ha->eh_active == 0) {
 786                 shost->host_eh_scheduled = 0;
 787                 retry = false;
 788         }
 789         spin_unlock_irq(&ha->lock);
 790
 791         if (retry)
 792                 goto retry;
 793
 794         SAS_DPRINTK("--- Exit %s: busy: %d failed: %d tries: %d\n",
 795                     __func__, atomic_read(&shost->host_busy),
 796                     shost->host_failed, tries);
 797 }
 798
 799 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 800 {
 801         scmd_dbg(cmd, "command %p timed out\n", cmd);
 802
 803         return BLK_EH_NOT_HANDLED;
 804 }
 805
 806 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 807 {
 808         struct domain_device *dev = sdev_to_domain_dev(sdev);
 809
 810         if (dev_is_sata(dev))
 811                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
 812
 813         return -EINVAL;
 814 }
 815
 816 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 817 {
 818         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 819         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 820         struct domain_device *found_dev = NULL;
 821         int i;
 822         unsigned long flags;
 823
 824         spin_lock_irqsave(&ha->phy_port_lock, flags);
 825         for (i = 0; i < ha->num_phys; i++) {
 826                 struct asd_sas_port *port = ha->sas_port[i];
 827                 struct domain_device *dev;
 828
 829                 spin_lock(&port->dev_list_lock);
 830                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 831                         if (rphy == dev->rphy) {
 832                                 found_dev = dev;
 833                                 spin_unlock(&port->dev_list_lock);
 834                                 goto found;
 835                         }
 836                 }
 837                 spin_unlock(&port->dev_list_lock);
 838         }
 839  found:
 840         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 841
 842         return found_dev;
 843 }
 844
 845 int sas_target_alloc(struct scsi_target *starget)
 846 {
 847         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 848         struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
 849
 850         if (!found_dev)
 851                 return -ENODEV;
 852
 853         kref_get(&found_dev->kref);
 854         starget->hostdata = found_dev;
 855         return 0;
 856 }
 857
 858 #define SAS_DEF_QD 256
 859
 860 int sas_slave_configure(struct scsi_device *scsi_dev)
 861 {
 862         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 863         struct sas_ha_struct *sas_ha;
 864
 865         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 866
 867         if (dev_is_sata(dev)) {
 868                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 869                 return 0;
 870         }
 871
 872         sas_ha = dev->port->ha;
 873
 874         sas_read_port_mode_page(scsi_dev);
 875
 876         if (scsi_dev->tagged_supported) {
 877                 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
 878         } else {
 879                 SAS_DPRINTK("device %llx, LUN %llx doesn't support "
 880                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 881                             scsi_dev->lun);
 882                 scsi_change_queue_depth(scsi_dev, 1);
 883         }
 884
 885         scsi_dev->allow_restart = 1;
 886
 887         return 0;
 888 }
 889
 890 int sas_change_queue_depth(struct scsi_device *sdev, int depth)
 891 {
 892         struct domain_device *dev = sdev_to_domain_dev(sdev);
 893
 894         if (dev_is_sata(dev))
 895                 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
 896
 897         if (!sdev->tagged_supported)
 898                 depth = 1;
 899         return scsi_change_queue_depth(sdev, depth);
 900 }
 901
 902 int sas_bios_param(struct scsi_device *scsi_dev,
 903                           struct block_device *bdev,
 904                           sector_t capacity, int *hsc)
 905 {
 906         hsc[0] = 255;
 907         hsc[1] = 63;
 908         sector_div(capacity, 255*63);
 909         hsc[2] = capacity;
 910
 911         return 0;
 912 }
 913
 914 /*
 915  * Tell an upper layer that it needs to initiate an abort for a given task.
 916  * This should only ever be called by an LLDD.
 917  */
 918 void sas_task_abort(struct sas_task *task)
 919 {
 920         struct scsi_cmnd *sc = task->uldd_task;
 921
 922         /* Escape for libsas internal commands */
 923         if (!sc) {
 924                 struct sas_task_slow *slow = task->slow_task;
 925
 926                 if (!slow)
 927                         return;
 928                 if (!del_timer(&slow->timer))
 929                         return;
 930                 slow->timer.function(slow->timer.data);
 931                 return;
 932         }
 933
 934         if (dev_is_sata(task->dev)) {
 935                 sas_ata_task_abort(task);
 936         } else {
 937                 struct request_queue *q = sc->device->request_queue;
 938                 unsigned long flags;
 939
 940                 spin_lock_irqsave(q->queue_lock, flags);
 941                 blk_abort_request(sc->request);
 942                 spin_unlock_irqrestore(q->queue_lock, flags);
 943         }
 944 }
 945
 946 void sas_target_destroy(struct scsi_target *starget)
 947 {
 948         struct domain_device *found_dev = starget->hostdata;
 949
 950         if (!found_dev)
 951                 return;
 952
 953         starget->hostdata = NULL;
 954         sas_put_device(found_dev);
 955 }
 956
 957 static void sas_parse_addr(u8 *sas_addr, const char *p)
 958 {
 959         int i;
 960         for (i = 0; i < SAS_ADDR_SIZE; i++) {
 961                 u8 h, l;
 962                 if (!*p)
 963                         break;
 964                 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
 965                 p++;
 966                 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
 967                 p++;
 968                 sas_addr[i] = (h<<4) | l;
 969         }
 970 }
 971
 972 #define SAS_STRING_ADDR_SIZE    16
 973
 974 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
 975 {
 976         int res;
 977         const struct firmware *fw;
 978
 979         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
 980         if (res)
 981                 return res;
 982
 983         if (fw->size < SAS_STRING_ADDR_SIZE) {
 984                 res = -ENODEV;
 985                 goto out;
 986         }
 987
 988         sas_parse_addr(addr, fw->data);
 989
 990 out:
 991         release_firmware(fw);
 992         return res;
 993 }
 994 EXPORT_SYMBOL_GPL(sas_request_addr);
 995
 996 EXPORT_SYMBOL_GPL(sas_queuecommand);
 997 EXPORT_SYMBOL_GPL(sas_target_alloc);
 998 EXPORT_SYMBOL_GPL(sas_slave_configure);
 999 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1000 EXPORT_SYMBOL_GPL(sas_bios_param);
1001 EXPORT_SYMBOL_GPL(sas_task_abort);
1002 EXPORT_SYMBOL_GPL(sas_phy_reset);
1003 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1004 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1005 EXPORT_SYMBOL_GPL(sas_target_destroy);
1006 EXPORT_SYMBOL_GPL(sas_ioctl);