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 /* ---------- SCSI Host glue ---------- */
  53
  54 static void sas_scsi_task_done(struct sas_task *task)
  55 {
  56         struct task_status_struct *ts = &task->task_status;
  57         struct scsi_cmnd *sc = task->uldd_task;
  58         int hs = 0, stat = 0;
  59
  60         if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
  61                 /* Aborted tasks will be completed by the error handler */
  62                 SAS_DPRINTK("task done but aborted\n");
  63                 return;
  64         }
  65
  66         if (unlikely(!sc)) {
  67                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  68                 list_del_init(&task->list);
  69                 sas_free_task(task);
  70                 return;
  71         }
  72
  73         if (ts->resp == SAS_TASK_UNDELIVERED) {
  74                 /* transport error */
  75                 hs = DID_NO_CONNECT;
  76         } else { /* ts->resp == SAS_TASK_COMPLETE */
  77                 /* task delivered, what happened afterwards? */
  78                 switch (ts->stat) {
  79                 case SAS_DEV_NO_RESPONSE:
  80                 case SAS_INTERRUPTED:
  81                 case SAS_PHY_DOWN:
  82                 case SAS_NAK_R_ERR:
  83                 case SAS_OPEN_TO:
  84                         hs = DID_NO_CONNECT;
  85                         break;
  86                 case SAS_DATA_UNDERRUN:
  87                         scsi_set_resid(sc, ts->residual);
  88                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  89                                 hs = DID_ERROR;
  90                         break;
  91                 case SAS_DATA_OVERRUN:
  92                         hs = DID_ERROR;
  93                         break;
  94                 case SAS_QUEUE_FULL:
  95                         hs = DID_SOFT_ERROR; /* retry */
  96                         break;
  97                 case SAS_DEVICE_UNKNOWN:
  98                         hs = DID_BAD_TARGET;
  99                         break;
 100                 case SAS_SG_ERR:
 101                         hs = DID_PARITY;
 102                         break;
 103                 case SAS_OPEN_REJECT:
 104                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
 105                                 hs = DID_SOFT_ERROR; /* retry */
 106                         else
 107                                 hs = DID_ERROR;
 108                         break;
 109                 case SAS_PROTO_RESPONSE:
 110                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
 111                                     "task; please report this\n",
 112                                     task->dev->port->ha->sas_ha_name);
 113                         break;
 114                 case SAS_ABORTED_TASK:
 115                         hs = DID_ABORT;
 116                         break;
 117                 case SAM_STAT_CHECK_CONDITION:
 118                         memcpy(sc->sense_buffer, ts->buf,
 119                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 120                         stat = SAM_STAT_CHECK_CONDITION;
 121                         break;
 122                 default:
 123                         stat = ts->stat;
 124                         break;
 125                 }
 126         }
 127         ASSIGN_SAS_TASK(sc, NULL);
 128         sc->result = (hs << 16) | stat;
 129         list_del_init(&task->list);
 130         sas_free_task(task);
 131         sc->scsi_done(sc);
 132 }
 133
 134 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 135                                                struct domain_device *dev,
 136                                                gfp_t gfp_flags)
 137 {
 138         struct sas_task *task = sas_alloc_task(gfp_flags);
 139         struct scsi_lun lun;
 140
 141         if (!task)
 142                 return NULL;
 143
 144         task->uldd_task = cmd;
 145         ASSIGN_SAS_TASK(cmd, task);
 146
 147         task->dev = dev;
 148         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 149
 150         task->ssp_task.retry_count = 1;
 151         int_to_scsilun(cmd->device->lun, &lun);
 152         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 153         task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
 154         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 155
 156         task->scatter = scsi_sglist(cmd);
 157         task->num_scatter = scsi_sg_count(cmd);
 158         task->total_xfer_len = scsi_bufflen(cmd);
 159         task->data_dir = cmd->sc_data_direction;
 160
 161         task->task_done = sas_scsi_task_done;
 162
 163         return task;
 164 }
 165
 166 int sas_queue_up(struct sas_task *task)
 167 {
 168         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 169         struct scsi_core *core = &sas_ha->core;
 170         unsigned long flags;
 171         LIST_HEAD(list);
 172
 173         spin_lock_irqsave(&core->task_queue_lock, flags);
 174         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 175                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 176                 return -SAS_QUEUE_FULL;
 177         }
 178         list_add_tail(&task->list, &core->task_queue);
 179         core->task_queue_size += 1;
 180         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 181         wake_up_process(core->queue_thread);
 182
 183         return 0;
 184 }
 185
 186 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 187 {
 188         struct sas_internal *i = to_sas_internal(host->transportt);
 189         struct domain_device *dev = cmd_to_domain_dev(cmd);
 190         struct sas_ha_struct *sas_ha = dev->port->ha;
 191         struct sas_task *task;
 192         int res = 0;
 193
 194         /* If the device fell off, no sense in issuing commands */
 195         if (dev->gone) {
 196                 cmd->result = DID_BAD_TARGET << 16;
 197                 goto out_done;
 198         }
 199
 200         if (dev_is_sata(dev)) {
 201                 unsigned long flags;
 202
 203                 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 204                 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
 205                 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 206                 return res;
 207         }
 208
 209         task = sas_create_task(cmd, dev, GFP_ATOMIC);
 210         if (!task)
 211                 return SCSI_MLQUEUE_HOST_BUSY;
 212
 213         /* Queue up, Direct Mode or Task Collector Mode. */
 214         if (sas_ha->lldd_max_execute_num < 2)
 215                 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 216         else
 217                 res = sas_queue_up(task);
 218
 219         if (res)
 220                 goto out_free_task;
 221         return 0;
 222
 223 out_free_task:
 224         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 225         ASSIGN_SAS_TASK(cmd, NULL);
 226         sas_free_task(task);
 227         if (res == -SAS_QUEUE_FULL)
 228                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 229         else
 230                 cmd->result = DID_ERROR << 16;
 231 out_done:
 232         cmd->scsi_done(cmd);
 233         return 0;
 234 }
 235
 236 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
 237 {
 238         struct sas_task *task = TO_SAS_TASK(cmd);
 239         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
 240
 241         /* remove the aborted task flag to allow the task to be
 242          * completed now. At this point, we only get called following
 243          * an actual abort of the task, so we should be guaranteed not
 244          * to be racing with any completions from the LLD (hence we
 245          * don't need the task state lock to clear the flag) */
 246         task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 247         /* Now call task_done.  However, task will be free'd after
 248          * this */
 249         task->task_done(task);
 250         /* now finish the command and move it on to the error
 251          * handler done list, this also takes it off the
 252          * error handler pending list */
 253         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
 254 }
 255
 256 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 257 {
 258         struct scsi_cmnd *cmd, *n;
 259
 260         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 261                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
 262                     cmd->device->lun == my_cmd->device->lun)
 263                         sas_eh_finish_cmd(cmd);
 264         }
 265 }
 266
 267 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 268                                      struct domain_device *dev)
 269 {
 270         struct scsi_cmnd *cmd, *n;
 271
 272         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 273                 struct domain_device *x = cmd_to_domain_dev(cmd);
 274
 275                 if (x == dev)
 276                         sas_eh_finish_cmd(cmd);
 277         }
 278 }
 279
 280 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 281                                       struct asd_sas_port *port)
 282 {
 283         struct scsi_cmnd *cmd, *n;
 284
 285         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 286                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 287                 struct asd_sas_port *x = dev->port;
 288
 289                 if (x == port)
 290                         sas_eh_finish_cmd(cmd);
 291         }
 292 }
 293
 294 enum task_disposition {
 295         TASK_IS_DONE,
 296         TASK_IS_ABORTED,
 297         TASK_IS_AT_LU,
 298         TASK_IS_NOT_AT_LU,
 299         TASK_ABORT_FAILED,
 300 };
 301
 302 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 303 {
 304         struct sas_ha_struct *ha = task->dev->port->ha;
 305         unsigned long flags;
 306         int i, res;
 307         struct sas_internal *si =
 308                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 309
 310         if (ha->lldd_max_execute_num > 1) {
 311                 struct scsi_core *core = &ha->core;
 312                 struct sas_task *t, *n;
 313
 314                 spin_lock_irqsave(&core->task_queue_lock, flags);
 315                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 316                         if (task == t) {
 317                                 list_del_init(&t->list);
 318                                 spin_unlock_irqrestore(&core->task_queue_lock,
 319                                                        flags);
 320                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 321                                             "task_queue\n",
 322                                             __func__, task);
 323                                 return TASK_IS_ABORTED;
 324                         }
 325                 }
 326                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 327         }
 328
 329         for (i = 0; i < 5; i++) {
 330                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
 331                 res = si->dft->lldd_abort_task(task);
 332
 333                 spin_lock_irqsave(&task->task_state_lock, flags);
 334                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 335                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 336                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 337                                     task);
 338                         return TASK_IS_DONE;
 339                 }
 340                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 341
 342                 if (res == TMF_RESP_FUNC_COMPLETE) {
 343                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 344                                     __func__, task);
 345                         return TASK_IS_ABORTED;
 346                 } else if (si->dft->lldd_query_task) {
 347                         SAS_DPRINTK("%s: querying task 0x%p\n",
 348                                     __func__, task);
 349                         res = si->dft->lldd_query_task(task);
 350                         switch (res) {
 351                         case TMF_RESP_FUNC_SUCC:
 352                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 353                                             __func__, task);
 354                                 return TASK_IS_AT_LU;
 355                         case TMF_RESP_FUNC_COMPLETE:
 356                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 357                                             __func__, task);
 358                                 return TASK_IS_NOT_AT_LU;
 359                         case TMF_RESP_FUNC_FAILED:
 360                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 361                                                 __func__, task);
 362                                 return TASK_ABORT_FAILED;
 363                         }
 364
 365                 }
 366         }
 367         return res;
 368 }
 369
 370 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 371 {
 372         int res = TMF_RESP_FUNC_FAILED;
 373         struct scsi_lun lun;
 374         struct sas_internal *i =
 375                 to_sas_internal(dev->port->ha->core.shost->transportt);
 376
 377         int_to_scsilun(cmd->device->lun, &lun);
 378
 379         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 380                     SAS_ADDR(dev->sas_addr),
 381                     cmd->device->lun);
 382
 383         if (i->dft->lldd_abort_task_set)
 384                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 385
 386         if (res == TMF_RESP_FUNC_FAILED) {
 387                 if (i->dft->lldd_clear_task_set)
 388                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 389         }
 390
 391         if (res == TMF_RESP_FUNC_FAILED) {
 392                 if (i->dft->lldd_lu_reset)
 393                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 394         }
 395
 396         return res;
 397 }
 398
 399 static int sas_recover_I_T(struct domain_device *dev)
 400 {
 401         int res = TMF_RESP_FUNC_FAILED;
 402         struct sas_internal *i =
 403                 to_sas_internal(dev->port->ha->core.shost->transportt);
 404
 405         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 406                     SAS_ADDR(dev->sas_addr));
 407
 408         if (i->dft->lldd_I_T_nexus_reset)
 409                 res = i->dft->lldd_I_T_nexus_reset(dev);
 410
 411         return res;
 412 }
 413
 414 /* Find the sas_phy that's attached to this device */
 415 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
 416 {
 417         struct domain_device *pdev = dev->parent;
 418         struct ex_phy *exphy = NULL;
 419         int i;
 420
 421         /* Directly attached device */
 422         if (!pdev)
 423                 return dev->port->phy;
 424
 425         /* Otherwise look in the expander */
 426         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 427                 if (!memcmp(dev->sas_addr,
 428                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 429                             SAS_ADDR_SIZE)) {
 430                         exphy = &pdev->ex_dev.ex_phy[i];
 431                         break;
 432                 }
 433
 434         BUG_ON(!exphy);
 435         return exphy->phy;
 436 }
 437 EXPORT_SYMBOL_GPL(sas_find_local_phy);
 438
 439 /* Attempt to send a LUN reset message to a device */
 440 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 441 {
 442         struct domain_device *dev = cmd_to_domain_dev(cmd);
 443         struct sas_internal *i =
 444                 to_sas_internal(dev->port->ha->core.shost->transportt);
 445         struct scsi_lun lun;
 446         int res;
 447
 448         int_to_scsilun(cmd->device->lun, &lun);
 449
 450         if (!i->dft->lldd_lu_reset)
 451                 return FAILED;
 452
 453         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 454         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 455                 return SUCCESS;
 456
 457         return FAILED;
 458 }
 459
 460 /* Attempt to send a phy (bus) reset */
 461 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 462 {
 463         struct domain_device *dev = cmd_to_domain_dev(cmd);
 464         struct sas_phy *phy = sas_find_local_phy(dev);
 465         int res;
 466
 467         res = sas_phy_reset(phy, 1);
 468         if (res)
 469                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 470                             kobject_name(&phy->dev.kobj),
 471                             res);
 472         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 473                 return SUCCESS;
 474
 475         return FAILED;
 476 }
 477
 478 /* Try to reset a device */
 479 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
 480 {
 481         int res;
 482         struct Scsi_Host *shost = cmd->device->host;
 483
 484         if (!shost->hostt->eh_device_reset_handler)
 485                 goto try_bus_reset;
 486
 487         res = shost->hostt->eh_device_reset_handler(cmd);
 488         if (res == SUCCESS)
 489                 return res;
 490
 491 try_bus_reset:
 492         if (shost->hostt->eh_bus_reset_handler)
 493                 return shost->hostt->eh_bus_reset_handler(cmd);
 494
 495         return FAILED;
 496 }
 497
 498 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 499                                     struct list_head *work_q,
 500                                     struct list_head *done_q)
 501 {
 502         struct scsi_cmnd *cmd, *n;
 503         enum task_disposition res = TASK_IS_DONE;
 504         int tmf_resp, need_reset;
 505         struct sas_internal *i = to_sas_internal(shost->transportt);
 506         unsigned long flags;
 507         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 508
 509 Again:
 510         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 511                 struct sas_task *task = TO_SAS_TASK(cmd);
 512
 513                 if (!task)
 514                         continue;
 515
 516                 list_del_init(&cmd->eh_entry);
 517
 518                 spin_lock_irqsave(&task->task_state_lock, flags);
 519                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 520                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 521
 522                 if (need_reset) {
 523                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
 524                                     __func__, task);
 525                         goto reset;
 526                 }
 527
 528                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 529                 res = sas_scsi_find_task(task);
 530
 531                 cmd->eh_eflags = 0;
 532
 533                 switch (res) {
 534                 case TASK_IS_DONE:
 535                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 536                                     task);
 537                         sas_eh_finish_cmd(cmd);
 538                         continue;
 539                 case TASK_IS_ABORTED:
 540                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 541                                     __func__, task);
 542                         sas_eh_finish_cmd(cmd);
 543                         continue;
 544                 case TASK_IS_AT_LU:
 545                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 546  reset:
 547                         tmf_resp = sas_recover_lu(task->dev, cmd);
 548                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 549                                 SAS_DPRINTK("dev %016llx LU %x is "
 550                                             "recovered\n",
 551                                             SAS_ADDR(task->dev),
 552                                             cmd->device->lun);
 553                                 sas_eh_finish_cmd(cmd);
 554                                 sas_scsi_clear_queue_lu(work_q, cmd);
 555                                 goto Again;
 556                         }
 557                         /* fallthrough */
 558                 case TASK_IS_NOT_AT_LU:
 559                 case TASK_ABORT_FAILED:
 560                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 561                                     task);
 562                         tmf_resp = sas_recover_I_T(task->dev);
 563                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 564                                 struct domain_device *dev = task->dev;
 565                                 SAS_DPRINTK("I_T %016llx recovered\n",
 566                                             SAS_ADDR(task->dev->sas_addr));
 567                                 sas_eh_finish_cmd(cmd);
 568                                 sas_scsi_clear_queue_I_T(work_q, dev);
 569                                 goto Again;
 570                         }
 571                         /* Hammer time :-) */
 572                         try_to_reset_cmd_device(cmd);
 573                         if (i->dft->lldd_clear_nexus_port) {
 574                                 struct asd_sas_port *port = task->dev->port;
 575                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 576                                             port->id);
 577                                 res = i->dft->lldd_clear_nexus_port(port);
 578                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 579                                         SAS_DPRINTK("clear nexus port:%d "
 580                                                     "succeeded\n", port->id);
 581                                         sas_eh_finish_cmd(cmd);
 582                                         sas_scsi_clear_queue_port(work_q,
 583                                                                   port);
 584                                         goto Again;
 585                                 }
 586                         }
 587                         if (i->dft->lldd_clear_nexus_ha) {
 588                                 SAS_DPRINTK("clear nexus ha\n");
 589                                 res = i->dft->lldd_clear_nexus_ha(ha);
 590                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 591                                         SAS_DPRINTK("clear nexus ha "
 592                                                     "succeeded\n");
 593                                         sas_eh_finish_cmd(cmd);
 594                                         goto clear_q;
 595                                 }
 596                         }
 597                         /* If we are here -- this means that no amount
 598                          * of effort could recover from errors.  Quite
 599                          * possibly the HA just disappeared.
 600                          */
 601                         SAS_DPRINTK("error from  device %llx, LUN %x "
 602                                     "couldn't be recovered in any way\n",
 603                                     SAS_ADDR(task->dev->sas_addr),
 604                                     cmd->device->lun);
 605
 606                         sas_eh_finish_cmd(cmd);
 607                         goto clear_q;
 608                 }
 609         }
 610         return list_empty(work_q);
 611 clear_q:
 612         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
 613         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 614                 sas_eh_finish_cmd(cmd);
 615
 616         return list_empty(work_q);
 617 }
 618
 619 void sas_scsi_recover_host(struct Scsi_Host *shost)
 620 {
 621         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 622         unsigned long flags;
 623         LIST_HEAD(eh_work_q);
 624
 625         spin_lock_irqsave(shost->host_lock, flags);
 626         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 627         shost->host_eh_scheduled = 0;
 628         spin_unlock_irqrestore(shost->host_lock, flags);
 629
 630         SAS_DPRINTK("Enter %s\n", __func__);
 631         /*
 632          * Deal with commands that still have SAS tasks (i.e. they didn't
 633          * complete via the normal sas_task completion mechanism)
 634          */
 635         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 636                 goto out;
 637
 638         /*
 639          * Now deal with SCSI commands that completed ok but have a an error
 640          * code (and hopefully sense data) attached.  This is roughly what
 641          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 642          * command we see here has no sas_task and is thus unknown to the HA.
 643          */
 644         if (!sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q))
 645                 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 646                         scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 647
 648 out:
 649         /* now link into libata eh --- if we have any ata devices */
 650         sas_ata_strategy_handler(shost);
 651
 652         scsi_eh_flush_done_q(&ha->eh_done_q);
 653
 654         SAS_DPRINTK("--- Exit %s\n", __func__);
 655         return;
 656 }
 657
 658 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 659 {
 660         struct sas_task *task = TO_SAS_TASK(cmd);
 661         unsigned long flags;
 662         enum blk_eh_timer_return rtn;
 663
 664         if (sas_ata_timed_out(cmd, task, &rtn))
 665                 return rtn;
 666
 667         if (!task) {
 668                 cmd->request->timeout /= 2;
 669                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 670                             cmd, task, (cmd->request->timeout ?
 671                             "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
 672                 if (!cmd->request->timeout)
 673                         return BLK_EH_NOT_HANDLED;
 674                 return BLK_EH_RESET_TIMER;
 675         }
 676
 677         spin_lock_irqsave(&task->task_state_lock, flags);
 678         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 679         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 680                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 681                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
 682                             "BLK_EH_HANDLED\n", cmd, task);
 683                 return BLK_EH_HANDLED;
 684         }
 685         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 686                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 687                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 688                             "BLK_EH_RESET_TIMER\n",
 689                             cmd, task);
 690                 return BLK_EH_RESET_TIMER;
 691         }
 692         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 693         spin_unlock_irqrestore(&task->task_state_lock, flags);
 694
 695         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
 696                     cmd, task);
 697
 698         return BLK_EH_NOT_HANDLED;
 699 }
 700
 701 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 702 {
 703         struct domain_device *dev = sdev_to_domain_dev(sdev);
 704
 705         if (dev_is_sata(dev))
 706                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
 707
 708         return -EINVAL;
 709 }
 710
 711 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 712 {
 713         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 714         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 715         struct domain_device *found_dev = NULL;
 716         int i;
 717         unsigned long flags;
 718
 719         spin_lock_irqsave(&ha->phy_port_lock, flags);
 720         for (i = 0; i < ha->num_phys; i++) {
 721                 struct asd_sas_port *port = ha->sas_port[i];
 722                 struct domain_device *dev;
 723
 724                 spin_lock(&port->dev_list_lock);
 725                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 726                         if (rphy == dev->rphy) {
 727                                 found_dev = dev;
 728                                 spin_unlock(&port->dev_list_lock);
 729                                 goto found;
 730                         }
 731                 }
 732                 spin_unlock(&port->dev_list_lock);
 733         }
 734  found:
 735         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 736
 737         return found_dev;
 738 }
 739
 740 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 741 {
 742         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 743
 744         return sas_find_dev_by_rphy(rphy);
 745 }
 746
 747 int sas_target_alloc(struct scsi_target *starget)
 748 {
 749         struct domain_device *found_dev = sas_find_target(starget);
 750         int res;
 751
 752         if (!found_dev)
 753                 return -ENODEV;
 754
 755         if (dev_is_sata(found_dev)) {
 756                 res = sas_ata_init_host_and_port(found_dev, starget);
 757                 if (res)
 758                         return res;
 759         }
 760
 761         starget->hostdata = found_dev;
 762         return 0;
 763 }
 764
 765 #define SAS_DEF_QD 256
 766
 767 int sas_slave_configure(struct scsi_device *scsi_dev)
 768 {
 769         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 770         struct sas_ha_struct *sas_ha;
 771
 772         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 773
 774         if (dev_is_sata(dev)) {
 775                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 776                 return 0;
 777         }
 778
 779         sas_ha = dev->port->ha;
 780
 781         sas_read_port_mode_page(scsi_dev);
 782
 783         if (scsi_dev->tagged_supported) {
 784                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 785                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 786         } else {
 787                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 788                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 789                             scsi_dev->lun);
 790                 scsi_dev->tagged_supported = 0;
 791                 scsi_set_tag_type(scsi_dev, 0);
 792                 scsi_deactivate_tcq(scsi_dev, 1);
 793         }
 794
 795         scsi_dev->allow_restart = 1;
 796
 797         return 0;
 798 }
 799
 800 void sas_slave_destroy(struct scsi_device *scsi_dev)
 801 {
 802         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 803
 804         if (dev_is_sata(dev))
 805                 sas_to_ata_dev(dev)->class = ATA_DEV_NONE;
 806 }
 807
 808 int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
 809 {
 810         struct domain_device *dev = sdev_to_domain_dev(sdev);
 811
 812         if (dev_is_sata(dev))
 813                 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
 814                                                 reason);
 815
 816         switch (reason) {
 817         case SCSI_QDEPTH_DEFAULT:
 818         case SCSI_QDEPTH_RAMP_UP:
 819                 if (!sdev->tagged_supported)
 820                         depth = 1;
 821                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
 822                 break;
 823         case SCSI_QDEPTH_QFULL:
 824                 scsi_track_queue_full(sdev, depth);
 825                 break;
 826         default:
 827                 return -EOPNOTSUPP;
 828         }
 829
 830         return depth;
 831 }
 832
 833 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 834 {
 835         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 836
 837         if (dev_is_sata(dev))
 838                 return -EINVAL;
 839
 840         if (!scsi_dev->tagged_supported)
 841                 return 0;
 842
 843         scsi_deactivate_tcq(scsi_dev, 1);
 844
 845         scsi_set_tag_type(scsi_dev, qt);
 846         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 847
 848         return qt;
 849 }
 850
 851 int sas_bios_param(struct scsi_device *scsi_dev,
 852                           struct block_device *bdev,
 853                           sector_t capacity, int *hsc)
 854 {
 855         hsc[0] = 255;
 856         hsc[1] = 63;
 857         sector_div(capacity, 255*63);
 858         hsc[2] = capacity;
 859
 860         return 0;
 861 }
 862
 863 /* ---------- Task Collector Thread implementation ---------- */
 864
 865 static void sas_queue(struct sas_ha_struct *sas_ha)
 866 {
 867         struct scsi_core *core = &sas_ha->core;
 868         unsigned long flags;
 869         LIST_HEAD(q);
 870         int can_queue;
 871         int res;
 872         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 873
 874         spin_lock_irqsave(&core->task_queue_lock, flags);
 875         while (!kthread_should_stop() &&
 876                !list_empty(&core->task_queue)) {
 877
 878                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 879                 if (can_queue >= 0) {
 880                         can_queue = core->task_queue_size;
 881                         list_splice_init(&core->task_queue, &q);
 882                 } else {
 883                         struct list_head *a, *n;
 884
 885                         can_queue = sas_ha->lldd_queue_size;
 886                         list_for_each_safe(a, n, &core->task_queue) {
 887                                 list_move_tail(a, &q);
 888                                 if (--can_queue == 0)
 889                                         break;
 890                         }
 891                         can_queue = sas_ha->lldd_queue_size;
 892                 }
 893                 core->task_queue_size -= can_queue;
 894                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 895                 {
 896                         struct sas_task *task = list_entry(q.next,
 897                                                            struct sas_task,
 898                                                            list);
 899                         list_del_init(&q);
 900                         res = i->dft->lldd_execute_task(task, can_queue,
 901                                                         GFP_KERNEL);
 902                         if (unlikely(res))
 903                                 __list_add(&q, task->list.prev, &task->list);
 904                 }
 905                 spin_lock_irqsave(&core->task_queue_lock, flags);
 906                 if (res) {
 907                         list_splice_init(&q, &core->task_queue); /*at head*/
 908                         core->task_queue_size += can_queue;
 909                 }
 910         }
 911         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 912 }
 913
 914 /**
 915  * sas_queue_thread -- The Task Collector thread
 916  * @_sas_ha: pointer to struct sas_ha
 917  */
 918 static int sas_queue_thread(void *_sas_ha)
 919 {
 920         struct sas_ha_struct *sas_ha = _sas_ha;
 921
 922         while (1) {
 923                 set_current_state(TASK_INTERRUPTIBLE);
 924                 schedule();
 925                 sas_queue(sas_ha);
 926                 if (kthread_should_stop())
 927                         break;
 928         }
 929
 930         return 0;
 931 }
 932
 933 int sas_init_queue(struct sas_ha_struct *sas_ha)
 934 {
 935         struct scsi_core *core = &sas_ha->core;
 936
 937         spin_lock_init(&core->task_queue_lock);
 938         core->task_queue_size = 0;
 939         INIT_LIST_HEAD(&core->task_queue);
 940
 941         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 942                                          "sas_queue_%d", core->shost->host_no);
 943         if (IS_ERR(core->queue_thread))
 944                 return PTR_ERR(core->queue_thread);
 945         return 0;
 946 }
 947
 948 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 949 {
 950         unsigned long flags;
 951         struct scsi_core *core = &sas_ha->core;
 952         struct sas_task *task, *n;
 953
 954         kthread_stop(core->queue_thread);
 955
 956         if (!list_empty(&core->task_queue))
 957                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 958                             SAS_ADDR(sas_ha->sas_addr));
 959
 960         spin_lock_irqsave(&core->task_queue_lock, flags);
 961         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 962                 struct scsi_cmnd *cmd = task->uldd_task;
 963
 964                 list_del_init(&task->list);
 965
 966                 ASSIGN_SAS_TASK(cmd, NULL);
 967                 sas_free_task(task);
 968                 cmd->result = DID_ABORT << 16;
 969                 cmd->scsi_done(cmd);
 970         }
 971         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 972 }
 973
 974 /*
 975  * Call the LLDD task abort routine directly.  This function is intended for
 976  * use by upper layers that need to tell the LLDD to abort a task.
 977  */
 978 int __sas_task_abort(struct sas_task *task)
 979 {
 980         struct sas_internal *si =
 981                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 982         unsigned long flags;
 983         int res;
 984
 985         spin_lock_irqsave(&task->task_state_lock, flags);
 986         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 987             task->task_state_flags & SAS_TASK_STATE_DONE) {
 988                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 989                 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
 990                             task);
 991                 return 0;
 992         }
 993         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 994         spin_unlock_irqrestore(&task->task_state_lock, flags);
 995
 996         if (!si->dft->lldd_abort_task)
 997                 return -ENODEV;
 998
 999         res = si->dft->lldd_abort_task(task);
1000
1001         spin_lock_irqsave(&task->task_state_lock, flags);
1002         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1003             (res == TMF_RESP_FUNC_COMPLETE))
1004         {
1005                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1006                 task->task_done(task);
1007                 return 0;
1008         }
1009
1010         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1011                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1012         spin_unlock_irqrestore(&task->task_state_lock, flags);
1013
1014         return -EAGAIN;
1015 }
1016
1017 /*
1018  * Tell an upper layer that it needs to initiate an abort for a given task.
1019  * This should only ever be called by an LLDD.
1020  */
1021 void sas_task_abort(struct sas_task *task)
1022 {
1023         struct scsi_cmnd *sc = task->uldd_task;
1024
1025         /* Escape for libsas internal commands */
1026         if (!sc) {
1027                 if (!del_timer(&task->timer))
1028                         return;
1029                 task->timer.function(task->timer.data);
1030                 return;
1031         }
1032
1033         if (dev_is_sata(task->dev)) {
1034                 sas_ata_task_abort(task);
1035         } else {
1036                 struct request_queue *q = sc->device->request_queue;
1037                 unsigned long flags;
1038
1039                 spin_lock_irqsave(q->queue_lock, flags);
1040                 blk_abort_request(sc->request);
1041                 spin_unlock_irqrestore(q->queue_lock, flags);
1042                 scsi_schedule_eh(sc->device->host);
1043         }
1044 }
1045
1046 int sas_slave_alloc(struct scsi_device *scsi_dev)
1047 {
1048         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1049
1050         if (dev_is_sata(dev))
1051                 return ata_sas_port_init(dev->sata_dev.ap);
1052
1053         return 0;
1054 }
1055
1056 void sas_target_destroy(struct scsi_target *starget)
1057 {
1058         struct domain_device *found_dev = sas_find_target(starget);
1059
1060         if (!found_dev)
1061                 return;
1062
1063         if (dev_is_sata(found_dev))
1064                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1065
1066         return;
1067 }
1068
1069 static void sas_parse_addr(u8 *sas_addr, const char *p)
1070 {
1071         int i;
1072         for (i = 0; i < SAS_ADDR_SIZE; i++) {
1073                 u8 h, l;
1074                 if (!*p)
1075                         break;
1076                 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1077                 p++;
1078                 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1079                 p++;
1080                 sas_addr[i] = (h<<4) | l;
1081         }
1082 }
1083
1084 #define SAS_STRING_ADDR_SIZE    16
1085
1086 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1087 {
1088         int res;
1089         const struct firmware *fw;
1090
1091         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1092         if (res)
1093                 return res;
1094
1095         if (fw->size < SAS_STRING_ADDR_SIZE) {
1096                 res = -ENODEV;
1097                 goto out;
1098         }
1099
1100         sas_parse_addr(addr, fw->data);
1101
1102 out:
1103         release_firmware(fw);
1104         return res;
1105 }
1106 EXPORT_SYMBOL_GPL(sas_request_addr);
1107
1108 EXPORT_SYMBOL_GPL(sas_queuecommand);
1109 EXPORT_SYMBOL_GPL(sas_target_alloc);
1110 EXPORT_SYMBOL_GPL(sas_slave_configure);
1111 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1112 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1113 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1114 EXPORT_SYMBOL_GPL(sas_bios_param);
1115 EXPORT_SYMBOL_GPL(__sas_task_abort);
1116 EXPORT_SYMBOL_GPL(sas_task_abort);
1117 EXPORT_SYMBOL_GPL(sas_phy_reset);
1118 EXPORT_SYMBOL_GPL(sas_phy_enable);
1119 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1120 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1121 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1122 EXPORT_SYMBOL_GPL(sas_target_destroy);
1123 EXPORT_SYMBOL_GPL(sas_ioctl);