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 #include <linux/kernel.h>
  31
  32 #include "sas_internal.h"
  33
  34 #include <scsi/scsi_host.h>
  35 #include <scsi/scsi_device.h>
  36 #include <scsi/scsi_tcq.h>
  37 #include <scsi/scsi.h>
  38 #include <scsi/scsi_eh.h>
  39 #include <scsi/scsi_transport.h>
  40 #include <scsi/scsi_transport_sas.h>
  41 #include <scsi/sas_ata.h>
  42 #include "../scsi_sas_internal.h"
  43 #include "../scsi_transport_api.h"
  44 #include "../scsi_priv.h"
  45
  46 #include <linux/err.h>
  47 #include <linux/blkdev.h>
  48 #include <linux/freezer.h>
  49 #include <linux/gfp.h>
  50 #include <linux/scatterlist.h>
  51 #include <linux/libata.h>
  52
  53 /* record final status and free the task */
  54 static void sas_end_task(struct scsi_cmnd *sc, struct sas_task *task)
  55 {
  56         struct task_status_struct *ts = &task->task_status;
  57         int hs = 0, stat = 0;
  58
  59         if (ts->resp == SAS_TASK_UNDELIVERED) {
  60                 /* transport error */
  61                 hs = DID_NO_CONNECT;
  62         } else { /* ts->resp == SAS_TASK_COMPLETE */
  63                 /* task delivered, what happened afterwards? */
  64                 switch (ts->stat) {
  65                 case SAS_DEV_NO_RESPONSE:
  66                 case SAS_INTERRUPTED:
  67                 case SAS_PHY_DOWN:
  68                 case SAS_NAK_R_ERR:
  69                 case SAS_OPEN_TO:
  70                         hs = DID_NO_CONNECT;
  71                         break;
  72                 case SAS_DATA_UNDERRUN:
  73                         scsi_set_resid(sc, ts->residual);
  74                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  75                                 hs = DID_ERROR;
  76                         break;
  77                 case SAS_DATA_OVERRUN:
  78                         hs = DID_ERROR;
  79                         break;
  80                 case SAS_QUEUE_FULL:
  81                         hs = DID_SOFT_ERROR; /* retry */
  82                         break;
  83                 case SAS_DEVICE_UNKNOWN:
  84                         hs = DID_BAD_TARGET;
  85                         break;
  86                 case SAS_SG_ERR:
  87                         hs = DID_PARITY;
  88                         break;
  89                 case SAS_OPEN_REJECT:
  90                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
  91                                 hs = DID_SOFT_ERROR; /* retry */
  92                         else
  93                                 hs = DID_ERROR;
  94                         break;
  95                 case SAS_PROTO_RESPONSE:
  96                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
  97                                     "task; please report this\n",
  98                                     task->dev->port->ha->sas_ha_name);
  99                         break;
 100                 case SAS_ABORTED_TASK:
 101                         hs = DID_ABORT;
 102                         break;
 103                 case SAM_STAT_CHECK_CONDITION:
 104                         memcpy(sc->sense_buffer, ts->buf,
 105                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 106                         stat = SAM_STAT_CHECK_CONDITION;
 107                         break;
 108                 default:
 109                         stat = ts->stat;
 110                         break;
 111                 }
 112         }
 113
 114         sc->result = (hs << 16) | stat;
 115         ASSIGN_SAS_TASK(sc, NULL);
 116         sas_free_task(task);
 117 }
 118
 119 static void sas_scsi_task_done(struct sas_task *task)
 120 {
 121         struct scsi_cmnd *sc = task->uldd_task;
 122         struct domain_device *dev = task->dev;
 123         struct sas_ha_struct *ha = dev->port->ha;
 124         unsigned long flags;
 125
 126         spin_lock_irqsave(&dev->done_lock, flags);
 127         if (test_bit(SAS_HA_FROZEN, &ha->state))
 128                 task = NULL;
 129         else
 130                 ASSIGN_SAS_TASK(sc, NULL);
 131         spin_unlock_irqrestore(&dev->done_lock, flags);
 132
 133         if (unlikely(!task)) {
 134                 /* task will be completed by the error handler */
 135                 SAS_DPRINTK("task done but aborted\n");
 136                 return;
 137         }
 138
 139         if (unlikely(!sc)) {
 140                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
 141                 sas_free_task(task);
 142                 return;
 143         }
 144
 145         sas_end_task(sc, task);
 146         sc->scsi_done(sc);
 147 }
 148
 149 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 150                                                struct domain_device *dev,
 151                                                gfp_t gfp_flags)
 152 {
 153         struct sas_task *task = sas_alloc_task(gfp_flags);
 154         struct scsi_lun lun;
 155
 156         if (!task)
 157                 return NULL;
 158
 159         task->uldd_task = cmd;
 160         ASSIGN_SAS_TASK(cmd, task);
 161
 162         task->dev = dev;
 163         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 164
 165         task->ssp_task.retry_count = 1;
 166         int_to_scsilun(cmd->device->lun, &lun);
 167         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 168         task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
 169         task->ssp_task.cmd = cmd;
 170
 171         task->scatter = scsi_sglist(cmd);
 172         task->num_scatter = scsi_sg_count(cmd);
 173         task->total_xfer_len = scsi_bufflen(cmd);
 174         task->data_dir = cmd->sc_data_direction;
 175
 176         task->task_done = sas_scsi_task_done;
 177
 178         return task;
 179 }
 180
 181 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 182 {
 183         struct sas_internal *i = to_sas_internal(host->transportt);
 184         struct domain_device *dev = cmd_to_domain_dev(cmd);
 185         struct sas_task *task;
 186         int res = 0;
 187
 188         /* If the device fell off, no sense in issuing commands */
 189         if (test_bit(SAS_DEV_GONE, &dev->state)) {
 190                 cmd->result = DID_BAD_TARGET << 16;
 191                 goto out_done;
 192         }
 193
 194         if (dev_is_sata(dev)) {
 195                 spin_lock_irq(dev->sata_dev.ap->lock);
 196                 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
 197                 spin_unlock_irq(dev->sata_dev.ap->lock);
 198                 return res;
 199         }
 200
 201         task = sas_create_task(cmd, dev, GFP_ATOMIC);
 202         if (!task)
 203                 return SCSI_MLQUEUE_HOST_BUSY;
 204
 205         res = i->dft->lldd_execute_task(task, GFP_ATOMIC);
 206         if (res)
 207                 goto out_free_task;
 208         return 0;
 209
 210 out_free_task:
 211         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 212         ASSIGN_SAS_TASK(cmd, NULL);
 213         sas_free_task(task);
 214         if (res == -SAS_QUEUE_FULL)
 215                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 216         else
 217                 cmd->result = DID_ERROR << 16;
 218 out_done:
 219         cmd->scsi_done(cmd);
 220         return 0;
 221 }
 222
 223 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
 224 {
 225         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
 226         struct domain_device *dev = cmd_to_domain_dev(cmd);
 227         struct sas_task *task = TO_SAS_TASK(cmd);
 228
 229         /* At this point, we only get called following an actual abort
 230          * of the task, so we should be guaranteed not to be racing with
 231          * any completions from the LLD.  Task is freed after this.
 232          */
 233         sas_end_task(cmd, task);
 234
 235         if (dev_is_sata(dev)) {
 236                 /* defer commands to libata so that libata EH can
 237                  * handle ata qcs correctly
 238                  */
 239                 list_move_tail(&cmd->eh_entry, &sas_ha->eh_ata_q);
 240                 return;
 241         }
 242
 243         /* now finish the command and move it on to the error
 244          * handler done list, this also takes it off the
 245          * error handler pending list.
 246          */
 247         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
 248 }
 249
 250 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 251 {
 252         struct scsi_cmnd *cmd, *n;
 253
 254         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 255                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
 256                     cmd->device->lun == my_cmd->device->lun)
 257                         sas_eh_finish_cmd(cmd);
 258         }
 259 }
 260
 261 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 262                                      struct domain_device *dev)
 263 {
 264         struct scsi_cmnd *cmd, *n;
 265
 266         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 267                 struct domain_device *x = cmd_to_domain_dev(cmd);
 268
 269                 if (x == dev)
 270                         sas_eh_finish_cmd(cmd);
 271         }
 272 }
 273
 274 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 275                                       struct asd_sas_port *port)
 276 {
 277         struct scsi_cmnd *cmd, *n;
 278
 279         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 280                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 281                 struct asd_sas_port *x = dev->port;
 282
 283                 if (x == port)
 284                         sas_eh_finish_cmd(cmd);
 285         }
 286 }
 287
 288 enum task_disposition {
 289         TASK_IS_DONE,
 290         TASK_IS_ABORTED,
 291         TASK_IS_AT_LU,
 292         TASK_IS_NOT_AT_LU,
 293         TASK_ABORT_FAILED,
 294 };
 295
 296 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 297 {
 298         unsigned long flags;
 299         int i, res;
 300         struct sas_internal *si =
 301                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 302
 303         for (i = 0; i < 5; i++) {
 304                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
 305                 res = si->dft->lldd_abort_task(task);
 306
 307                 spin_lock_irqsave(&task->task_state_lock, flags);
 308                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 309                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 310                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 311                                     task);
 312                         return TASK_IS_DONE;
 313                 }
 314                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 315
 316                 if (res == TMF_RESP_FUNC_COMPLETE) {
 317                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 318                                     __func__, task);
 319                         return TASK_IS_ABORTED;
 320                 } else if (si->dft->lldd_query_task) {
 321                         SAS_DPRINTK("%s: querying task 0x%p\n",
 322                                     __func__, task);
 323                         res = si->dft->lldd_query_task(task);
 324                         switch (res) {
 325                         case TMF_RESP_FUNC_SUCC:
 326                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 327                                             __func__, task);
 328                                 return TASK_IS_AT_LU;
 329                         case TMF_RESP_FUNC_COMPLETE:
 330                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 331                                             __func__, task);
 332                                 return TASK_IS_NOT_AT_LU;
 333                         case TMF_RESP_FUNC_FAILED:
 334                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 335                                                 __func__, task);
 336                                 return TASK_ABORT_FAILED;
 337                         }
 338
 339                 }
 340         }
 341         return res;
 342 }
 343
 344 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 345 {
 346         int res = TMF_RESP_FUNC_FAILED;
 347         struct scsi_lun lun;
 348         struct sas_internal *i =
 349                 to_sas_internal(dev->port->ha->core.shost->transportt);
 350
 351         int_to_scsilun(cmd->device->lun, &lun);
 352
 353         SAS_DPRINTK("eh: device %llx LUN %llx has the task\n",
 354                     SAS_ADDR(dev->sas_addr),
 355                     cmd->device->lun);
 356
 357         if (i->dft->lldd_abort_task_set)
 358                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 359
 360         if (res == TMF_RESP_FUNC_FAILED) {
 361                 if (i->dft->lldd_clear_task_set)
 362                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 363         }
 364
 365         if (res == TMF_RESP_FUNC_FAILED) {
 366                 if (i->dft->lldd_lu_reset)
 367                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 368         }
 369
 370         return res;
 371 }
 372
 373 static int sas_recover_I_T(struct domain_device *dev)
 374 {
 375         int res = TMF_RESP_FUNC_FAILED;
 376         struct sas_internal *i =
 377                 to_sas_internal(dev->port->ha->core.shost->transportt);
 378
 379         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 380                     SAS_ADDR(dev->sas_addr));
 381
 382         if (i->dft->lldd_I_T_nexus_reset)
 383                 res = i->dft->lldd_I_T_nexus_reset(dev);
 384
 385         return res;
 386 }
 387
 388 /* take a reference on the last known good phy for this device */
 389 struct sas_phy *sas_get_local_phy(struct domain_device *dev)
 390 {
 391         struct sas_ha_struct *ha = dev->port->ha;
 392         struct sas_phy *phy;
 393         unsigned long flags;
 394
 395         /* a published domain device always has a valid phy, it may be
 396          * stale, but it is never NULL
 397          */
 398         BUG_ON(!dev->phy);
 399
 400         spin_lock_irqsave(&ha->phy_port_lock, flags);
 401         phy = dev->phy;
 402         get_device(&phy->dev);
 403         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 404
 405         return phy;
 406 }
 407 EXPORT_SYMBOL_GPL(sas_get_local_phy);
 408
 409 static void sas_wait_eh(struct domain_device *dev)
 410 {
 411         struct sas_ha_struct *ha = dev->port->ha;
 412         DEFINE_WAIT(wait);
 413
 414         if (dev_is_sata(dev)) {
 415                 ata_port_wait_eh(dev->sata_dev.ap);
 416                 return;
 417         }
 418  retry:
 419         spin_lock_irq(&ha->lock);
 420
 421         while (test_bit(SAS_DEV_EH_PENDING, &dev->state)) {
 422                 prepare_to_wait(&ha->eh_wait_q, &wait, TASK_UNINTERRUPTIBLE);
 423                 spin_unlock_irq(&ha->lock);
 424                 schedule();
 425                 spin_lock_irq(&ha->lock);
 426         }
 427         finish_wait(&ha->eh_wait_q, &wait);
 428
 429         spin_unlock_irq(&ha->lock);
 430
 431         /* make sure SCSI EH is complete */
 432         if (scsi_host_in_recovery(ha->core.shost)) {
 433                 msleep(10);
 434                 goto retry;
 435         }
 436 }
 437 EXPORT_SYMBOL(sas_wait_eh);
 438
 439 static int sas_queue_reset(struct domain_device *dev, int reset_type,
 440                            u64 lun, int wait)
 441 {
 442         struct sas_ha_struct *ha = dev->port->ha;
 443         int scheduled = 0, tries = 100;
 444
 445         /* ata: promote lun reset to bus reset */
 446         if (dev_is_sata(dev)) {
 447                 sas_ata_schedule_reset(dev);
 448                 if (wait)
 449                         sas_ata_wait_eh(dev);
 450                 return SUCCESS;
 451         }
 452
 453         while (!scheduled && tries--) {
 454                 spin_lock_irq(&ha->lock);
 455                 if (!test_bit(SAS_DEV_EH_PENDING, &dev->state) &&
 456                     !test_bit(reset_type, &dev->state)) {
 457                         scheduled = 1;
 458                         ha->eh_active++;
 459                         list_add_tail(&dev->ssp_dev.eh_list_node, &ha->eh_dev_q);
 460                         set_bit(SAS_DEV_EH_PENDING, &dev->state);
 461                         set_bit(reset_type, &dev->state);
 462                         int_to_scsilun(lun, &dev->ssp_dev.reset_lun);
 463                         scsi_schedule_eh(ha->core.shost);
 464                 }
 465                 spin_unlock_irq(&ha->lock);
 466
 467                 if (wait)
 468                         sas_wait_eh(dev);
 469
 470                 if (scheduled)
 471                         return SUCCESS;
 472         }
 473
 474         SAS_DPRINTK("%s reset of %s failed\n",
 475                     reset_type == SAS_DEV_LU_RESET ? "LUN" : "Bus",
 476                     dev_name(&dev->rphy->dev));
 477
 478         return FAILED;
 479 }
 480
 481 int sas_eh_abort_handler(struct scsi_cmnd *cmd)
 482 {
 483         int res = TMF_RESP_FUNC_FAILED;
 484         struct sas_task *task = TO_SAS_TASK(cmd);
 485         struct Scsi_Host *host = cmd->device->host;
 486         struct domain_device *dev = cmd_to_domain_dev(cmd);
 487         struct sas_internal *i = to_sas_internal(host->transportt);
 488         unsigned long flags;
 489
 490         if (!i->dft->lldd_abort_task)
 491                 return FAILED;
 492
 493         spin_lock_irqsave(host->host_lock, flags);
 494         /* We cannot do async aborts for SATA devices */
 495         if (dev_is_sata(dev) && !host->host_eh_scheduled) {
 496                 spin_unlock_irqrestore(host->host_lock, flags);
 497                 return FAILED;
 498         }
 499         spin_unlock_irqrestore(host->host_lock, flags);
 500
 501         if (task)
 502                 res = i->dft->lldd_abort_task(task);
 503         else
 504                 SAS_DPRINTK("no task to abort\n");
 505         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 506                 return SUCCESS;
 507
 508         return FAILED;
 509 }
 510 EXPORT_SYMBOL_GPL(sas_eh_abort_handler);
 511
 512 /* Attempt to send a LUN reset message to a device */
 513 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 514 {
 515         int res;
 516         struct scsi_lun lun;
 517         struct Scsi_Host *host = cmd->device->host;
 518         struct domain_device *dev = cmd_to_domain_dev(cmd);
 519         struct sas_internal *i = to_sas_internal(host->transportt);
 520
 521         if (current != host->ehandler)
 522                 return sas_queue_reset(dev, SAS_DEV_LU_RESET, cmd->device->lun, 0);
 523
 524         int_to_scsilun(cmd->device->lun, &lun);
 525
 526         if (!i->dft->lldd_lu_reset)
 527                 return FAILED;
 528
 529         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 530         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 531                 return SUCCESS;
 532
 533         return FAILED;
 534 }
 535
 536 int sas_eh_target_reset_handler(struct scsi_cmnd *cmd)
 537 {
 538         int res;
 539         struct Scsi_Host *host = cmd->device->host;
 540         struct domain_device *dev = cmd_to_domain_dev(cmd);
 541         struct sas_internal *i = to_sas_internal(host->transportt);
 542
 543         if (current != host->ehandler)
 544                 return sas_queue_reset(dev, SAS_DEV_RESET, 0, 0);
 545
 546         if (!i->dft->lldd_I_T_nexus_reset)
 547                 return FAILED;
 548
 549         res = i->dft->lldd_I_T_nexus_reset(dev);
 550         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE ||
 551             res == -ENODEV)
 552                 return SUCCESS;
 553
 554         return FAILED;
 555 }
 556
 557 /* Try to reset a device */
 558 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
 559 {
 560         int res;
 561         struct Scsi_Host *shost = cmd->device->host;
 562
 563         if (!shost->hostt->eh_device_reset_handler)
 564                 goto try_target_reset;
 565
 566         res = shost->hostt->eh_device_reset_handler(cmd);
 567         if (res == SUCCESS)
 568                 return res;
 569
 570 try_target_reset:
 571         if (shost->hostt->eh_target_reset_handler)
 572                 return shost->hostt->eh_target_reset_handler(cmd);
 573
 574         return FAILED;
 575 }
 576
 577 static void sas_eh_handle_sas_errors(struct Scsi_Host *shost, struct list_head *work_q)
 578 {
 579         struct scsi_cmnd *cmd, *n;
 580         enum task_disposition res = TASK_IS_DONE;
 581         int tmf_resp, need_reset;
 582         struct sas_internal *i = to_sas_internal(shost->transportt);
 583         unsigned long flags;
 584         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 585         LIST_HEAD(done);
 586
 587         /* clean out any commands that won the completion vs eh race */
 588         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 589                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 590                 struct sas_task *task;
 591
 592                 spin_lock_irqsave(&dev->done_lock, flags);
 593                 /* by this point the lldd has either observed
 594                  * SAS_HA_FROZEN and is leaving the task alone, or has
 595                  * won the race with eh and decided to complete it
 596                  */
 597                 task = TO_SAS_TASK(cmd);
 598                 spin_unlock_irqrestore(&dev->done_lock, flags);
 599
 600                 if (!task)
 601                         list_move_tail(&cmd->eh_entry, &done);
 602         }
 603
 604  Again:
 605         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 606                 struct sas_task *task = TO_SAS_TASK(cmd);
 607
 608                 list_del_init(&cmd->eh_entry);
 609
 610                 spin_lock_irqsave(&task->task_state_lock, flags);
 611                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 612                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 613
 614                 if (need_reset) {
 615                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
 616                                     __func__, task);
 617                         goto reset;
 618                 }
 619
 620                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 621                 res = sas_scsi_find_task(task);
 622
 623                 switch (res) {
 624                 case TASK_IS_DONE:
 625                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 626                                     task);
 627                         sas_eh_finish_cmd(cmd);
 628                         continue;
 629                 case TASK_IS_ABORTED:
 630                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 631                                     __func__, task);
 632                         sas_eh_finish_cmd(cmd);
 633                         continue;
 634                 case TASK_IS_AT_LU:
 635                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 636  reset:
 637                         tmf_resp = sas_recover_lu(task->dev, cmd);
 638                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 639                                 SAS_DPRINTK("dev %016llx LU %llx is "
 640                                             "recovered\n",
 641                                             SAS_ADDR(task->dev),
 642                                             cmd->device->lun);
 643                                 sas_eh_finish_cmd(cmd);
 644                                 sas_scsi_clear_queue_lu(work_q, cmd);
 645                                 goto Again;
 646                         }
 647                         /* fallthrough */
 648                 case TASK_IS_NOT_AT_LU:
 649                 case TASK_ABORT_FAILED:
 650                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 651                                     task);
 652                         tmf_resp = sas_recover_I_T(task->dev);
 653                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE ||
 654                             tmf_resp == -ENODEV) {
 655                                 struct domain_device *dev = task->dev;
 656                                 SAS_DPRINTK("I_T %016llx recovered\n",
 657                                             SAS_ADDR(task->dev->sas_addr));
 658                                 sas_eh_finish_cmd(cmd);
 659                                 sas_scsi_clear_queue_I_T(work_q, dev);
 660                                 goto Again;
 661                         }
 662                         /* Hammer time :-) */
 663                         try_to_reset_cmd_device(cmd);
 664                         if (i->dft->lldd_clear_nexus_port) {
 665                                 struct asd_sas_port *port = task->dev->port;
 666                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 667                                             port->id);
 668                                 res = i->dft->lldd_clear_nexus_port(port);
 669                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 670                                         SAS_DPRINTK("clear nexus port:%d "
 671                                                     "succeeded\n", port->id);
 672                                         sas_eh_finish_cmd(cmd);
 673                                         sas_scsi_clear_queue_port(work_q,
 674                                                                   port);
 675                                         goto Again;
 676                                 }
 677                         }
 678                         if (i->dft->lldd_clear_nexus_ha) {
 679                                 SAS_DPRINTK("clear nexus ha\n");
 680                                 res = i->dft->lldd_clear_nexus_ha(ha);
 681                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 682                                         SAS_DPRINTK("clear nexus ha "
 683                                                     "succeeded\n");
 684                                         sas_eh_finish_cmd(cmd);
 685                                         goto clear_q;
 686                                 }
 687                         }
 688                         /* If we are here -- this means that no amount
 689                          * of effort could recover from errors.  Quite
 690                          * possibly the HA just disappeared.
 691                          */
 692                         SAS_DPRINTK("error from  device %llx, LUN %llx "
 693                                     "couldn't be recovered in any way\n",
 694                                     SAS_ADDR(task->dev->sas_addr),
 695                                     cmd->device->lun);
 696
 697                         sas_eh_finish_cmd(cmd);
 698                         goto clear_q;
 699                 }
 700         }
 701  out:
 702         list_splice_tail(&done, work_q);
 703         list_splice_tail_init(&ha->eh_ata_q, work_q);
 704         return;
 705
 706  clear_q:
 707         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
 708         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 709                 sas_eh_finish_cmd(cmd);
 710         goto out;
 711 }
 712
 713 static void sas_eh_handle_resets(struct Scsi_Host *shost)
 714 {
 715         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 716         struct sas_internal *i = to_sas_internal(shost->transportt);
 717
 718         /* handle directed resets to sas devices */
 719         spin_lock_irq(&ha->lock);
 720         while (!list_empty(&ha->eh_dev_q)) {
 721                 struct domain_device *dev;
 722                 struct ssp_device *ssp;
 723
 724                 ssp = list_entry(ha->eh_dev_q.next, typeof(*ssp), eh_list_node);
 725                 list_del_init(&ssp->eh_list_node);
 726                 dev = container_of(ssp, typeof(*dev), ssp_dev);
 727                 kref_get(&dev->kref);
 728                 WARN_ONCE(dev_is_sata(dev), "ssp reset to ata device?\n");
 729
 730                 spin_unlock_irq(&ha->lock);
 731
 732                 if (test_and_clear_bit(SAS_DEV_LU_RESET, &dev->state))
 733                         i->dft->lldd_lu_reset(dev, ssp->reset_lun.scsi_lun);
 734
 735                 if (test_and_clear_bit(SAS_DEV_RESET, &dev->state))
 736                         i->dft->lldd_I_T_nexus_reset(dev);
 737
 738                 sas_put_device(dev);
 739                 spin_lock_irq(&ha->lock);
 740                 clear_bit(SAS_DEV_EH_PENDING, &dev->state);
 741                 ha->eh_active--;
 742         }
 743         spin_unlock_irq(&ha->lock);
 744 }
 745
 746
 747 void sas_scsi_recover_host(struct Scsi_Host *shost)
 748 {
 749         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 750         LIST_HEAD(eh_work_q);
 751         int tries = 0;
 752         bool retry;
 753
 754 retry:
 755         tries++;
 756         retry = true;
 757         spin_lock_irq(shost->host_lock);
 758         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 759         spin_unlock_irq(shost->host_lock);
 760
 761         SAS_DPRINTK("Enter %s busy: %d failed: %d\n",
 762                     __func__, atomic_read(&shost->host_busy), shost->host_failed);
 763         /*
 764          * Deal with commands that still have SAS tasks (i.e. they didn't
 765          * complete via the normal sas_task completion mechanism),
 766          * SAS_HA_FROZEN gives eh dominion over all sas_task completion.
 767          */
 768         set_bit(SAS_HA_FROZEN, &ha->state);
 769         sas_eh_handle_sas_errors(shost, &eh_work_q);
 770         clear_bit(SAS_HA_FROZEN, &ha->state);
 771         if (list_empty(&eh_work_q))
 772                 goto out;
 773
 774         /*
 775          * Now deal with SCSI commands that completed ok but have a an error
 776          * code (and hopefully sense data) attached.  This is roughly what
 777          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 778          * command we see here has no sas_task and is thus unknown to the HA.
 779          */
 780         sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q);
 781         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 782                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 783
 784 out:
 785         sas_eh_handle_resets(shost);
 786
 787         /* now link into libata eh --- if we have any ata devices */
 788         sas_ata_strategy_handler(shost);
 789
 790         scsi_eh_flush_done_q(&ha->eh_done_q);
 791
 792         /* check if any new eh work was scheduled during the last run */
 793         spin_lock_irq(&ha->lock);
 794         if (ha->eh_active == 0) {
 795                 shost->host_eh_scheduled = 0;
 796                 retry = false;
 797         }
 798         spin_unlock_irq(&ha->lock);
 799
 800         if (retry)
 801                 goto retry;
 802
 803         SAS_DPRINTK("--- Exit %s: busy: %d failed: %d tries: %d\n",
 804                     __func__, atomic_read(&shost->host_busy),
 805                     shost->host_failed, tries);
 806 }
 807
 808 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 809 {
 810         struct domain_device *dev = sdev_to_domain_dev(sdev);
 811
 812         if (dev_is_sata(dev))
 813                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
 814
 815         return -EINVAL;
 816 }
 817
 818 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 819 {
 820         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 821         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 822         struct domain_device *found_dev = NULL;
 823         int i;
 824         unsigned long flags;
 825
 826         spin_lock_irqsave(&ha->phy_port_lock, flags);
 827         for (i = 0; i < ha->num_phys; i++) {
 828                 struct asd_sas_port *port = ha->sas_port[i];
 829                 struct domain_device *dev;
 830
 831                 spin_lock(&port->dev_list_lock);
 832                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 833                         if (rphy == dev->rphy) {
 834                                 found_dev = dev;
 835                                 spin_unlock(&port->dev_list_lock);
 836                                 goto found;
 837                         }
 838                 }
 839                 spin_unlock(&port->dev_list_lock);
 840         }
 841  found:
 842         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 843
 844         return found_dev;
 845 }
 846
 847 int sas_target_alloc(struct scsi_target *starget)
 848 {
 849         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 850         struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
 851
 852         if (!found_dev)
 853                 return -ENODEV;
 854
 855         kref_get(&found_dev->kref);
 856         starget->hostdata = found_dev;
 857         return 0;
 858 }
 859
 860 #define SAS_DEF_QD 256
 861
 862 int sas_slave_configure(struct scsi_device *scsi_dev)
 863 {
 864         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 865
 866         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 867
 868         if (dev_is_sata(dev)) {
 869                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 870                 return 0;
 871         }
 872
 873         sas_read_port_mode_page(scsi_dev);
 874
 875         if (scsi_dev->tagged_supported) {
 876                 scsi_change_queue_depth(scsi_dev, SAS_DEF_QD);
 877         } else {
 878                 SAS_DPRINTK("device %llx, LUN %llx doesn't support "
 879                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 880                             scsi_dev->lun);
 881                 scsi_change_queue_depth(scsi_dev, 1);
 882         }
 883
 884         scsi_dev->allow_restart = 1;
 885
 886         return 0;
 887 }
 888
 889 int sas_change_queue_depth(struct scsi_device *sdev, int depth)
 890 {
 891         struct domain_device *dev = sdev_to_domain_dev(sdev);
 892
 893         if (dev_is_sata(dev))
 894                 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth);
 895
 896         if (!sdev->tagged_supported)
 897                 depth = 1;
 898         return scsi_change_queue_depth(sdev, depth);
 899 }
 900
 901 int sas_bios_param(struct scsi_device *scsi_dev,
 902                           struct block_device *bdev,
 903                           sector_t capacity, int *hsc)
 904 {
 905         hsc[0] = 255;
 906         hsc[1] = 63;
 907         sector_div(capacity, 255*63);
 908         hsc[2] = capacity;
 909
 910         return 0;
 911 }
 912
 913 /*
 914  * Tell an upper layer that it needs to initiate an abort for a given task.
 915  * This should only ever be called by an LLDD.
 916  */
 917 void sas_task_abort(struct sas_task *task)
 918 {
 919         struct scsi_cmnd *sc = task->uldd_task;
 920
 921         /* Escape for libsas internal commands */
 922         if (!sc) {
 923                 struct sas_task_slow *slow = task->slow_task;
 924
 925                 if (!slow)
 926                         return;
 927                 if (!del_timer(&slow->timer))
 928                         return;
 929                 slow->timer.function(&slow->timer);
 930                 return;
 931         }
 932
 933         if (dev_is_sata(task->dev)) {
 934                 sas_ata_task_abort(task);
 935         } else {
 936                 struct request_queue *q = sc->device->request_queue;
 937                 unsigned long flags;
 938
 939                 spin_lock_irqsave(q->queue_lock, flags);
 940                 blk_abort_request(sc->request);
 941                 spin_unlock_irqrestore(q->queue_lock, flags);
 942         }
 943 }
 944
 945 void sas_target_destroy(struct scsi_target *starget)
 946 {
 947         struct domain_device *found_dev = starget->hostdata;
 948
 949         if (!found_dev)
 950                 return;
 951
 952         starget->hostdata = NULL;
 953         sas_put_device(found_dev);
 954 }
 955
 956 #define SAS_STRING_ADDR_SIZE    16
 957
 958 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
 959 {
 960         int res;
 961         const struct firmware *fw;
 962
 963         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
 964         if (res)
 965                 return res;
 966
 967         if (fw->size < SAS_STRING_ADDR_SIZE) {
 968                 res = -ENODEV;
 969                 goto out;
 970         }
 971
 972         res = hex2bin(addr, fw->data, strnlen(fw->data, SAS_ADDR_SIZE * 2) / 2);
 973         if (res)
 974                 goto out;
 975
 976 out:
 977         release_firmware(fw);
 978         return res;
 979 }
 980 EXPORT_SYMBOL_GPL(sas_request_addr);
 981
 982 EXPORT_SYMBOL_GPL(sas_queuecommand);
 983 EXPORT_SYMBOL_GPL(sas_target_alloc);
 984 EXPORT_SYMBOL_GPL(sas_slave_configure);
 985 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
 986 EXPORT_SYMBOL_GPL(sas_bios_param);
 987 EXPORT_SYMBOL_GPL(sas_task_abort);
 988 EXPORT_SYMBOL_GPL(sas_phy_reset);
 989 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
 990 EXPORT_SYMBOL_GPL(sas_eh_target_reset_handler);
 991 EXPORT_SYMBOL_GPL(sas_target_destroy);
 992 EXPORT_SYMBOL_GPL(sas_ioctl);