git.oblomov.eu Git - linux-2.6/blob - 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 "sas_internal.h"
  27
  28 #include <scsi/scsi_host.h>
  29 #include <scsi/scsi_device.h>
  30 #include <scsi/scsi_tcq.h>
  31 #include <scsi/scsi.h>
  32 #include <scsi/scsi_transport.h>
  33 #include <scsi/scsi_transport_sas.h>
  34 #include "../scsi_sas_internal.h"
  35
  36 #include <linux/err.h>
  37 #include <linux/blkdev.h>
  38 #include <linux/scatterlist.h>
  39
  40 /* ---------- SCSI Host glue ---------- */
  41
  42 #define TO_SAS_TASK(_scsi_cmd)  ((void *)(_scsi_cmd)->host_scribble)
  43 #define ASSIGN_SAS_TASK(_sc, _t) do { (_sc)->host_scribble = (void *) _t; } while (0)
  44
  45 static void sas_scsi_task_done(struct sas_task *task)
  46 {
  47         struct task_status_struct *ts = &task->task_status;
  48         struct scsi_cmnd *sc = task->uldd_task;
  49         unsigned ts_flags = task->task_state_flags;
  50         int hs = 0, stat = 0;
  51
  52         if (unlikely(!sc)) {
  53                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  54                 list_del_init(&task->list);
  55                 sas_free_task(task);
  56                 return;
  57         }
  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                         sc->resid = ts->residual;
  74                         if (sc->request_bufflen - sc->resid < 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_CHECK_COND:
 104                         memcpy(sc->sense_buffer, ts->buf,
 105                                max(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 106                         stat = SAM_CHECK_COND;
 107                         break;
 108                 default:
 109                         stat = ts->stat;
 110                         break;
 111                 }
 112         }
 113         ASSIGN_SAS_TASK(sc, NULL);
 114         sc->result = (hs << 16) | stat;
 115         list_del_init(&task->list);
 116         sas_free_task(task);
 117         /* This is very ugly but this is how SCSI Core works. */
 118         if (ts_flags & SAS_TASK_STATE_ABORTED)
 119                 scsi_finish_command(sc);
 120         else
 121                 sc->scsi_done(sc);
 122 }
 123
 124 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
 125 {
 126         enum task_attribute ta = TASK_ATTR_SIMPLE;
 127         if (cmd->request && blk_rq_tagged(cmd->request)) {
 128                 if (cmd->device->ordered_tags &&
 129                     (cmd->request->flags & REQ_HARDBARRIER))
 130                         ta = TASK_ATTR_HOQ;
 131         }
 132         return ta;
 133 }
 134
 135 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 136                                                struct domain_device *dev,
 137                                                unsigned long gfp_flags)
 138 {
 139         struct sas_task *task = sas_alloc_task(gfp_flags);
 140         struct scsi_lun lun;
 141
 142         if (!task)
 143                 return NULL;
 144
 145         *(u32 *)cmd->sense_buffer = 0;
 146         task->uldd_task = cmd;
 147         ASSIGN_SAS_TASK(cmd, task);
 148
 149         task->dev = dev;
 150         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 151
 152         task->ssp_task.retry_count = 1;
 153         int_to_scsilun(cmd->device->lun, &lun);
 154         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 155         task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
 156         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 157
 158         task->scatter = cmd->request_buffer;
 159         task->num_scatter = cmd->use_sg;
 160         task->total_xfer_len = cmd->request_bufflen;
 161         task->data_dir = cmd->sc_data_direction;
 162
 163         task->task_done = sas_scsi_task_done;
 164
 165         return task;
 166 }
 167
 168 static int sas_queue_up(struct sas_task *task)
 169 {
 170         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 171         struct scsi_core *core = &sas_ha->core;
 172         unsigned long flags;
 173         LIST_HEAD(list);
 174
 175         spin_lock_irqsave(&core->task_queue_lock, flags);
 176         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 177                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 178                 return -SAS_QUEUE_FULL;
 179         }
 180         list_add_tail(&task->list, &core->task_queue);
 181         core->task_queue_size += 1;
 182         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 183         up(&core->queue_thread_sema);
 184
 185         return 0;
 186 }
 187
 188 /**
 189  * sas_queuecommand -- Enqueue a command for processing
 190  * @parameters: See SCSI Core documentation
 191  *
 192  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
 193  * call us without holding an IRQ spinlock...
 194  */
 195 int sas_queuecommand(struct scsi_cmnd *cmd,
 196                      void (*scsi_done)(struct scsi_cmnd *))
 197 {
 198         int res = 0;
 199         struct domain_device *dev = cmd_to_domain_dev(cmd);
 200         struct Scsi_Host *host = cmd->device->host;
 201         struct sas_internal *i = to_sas_internal(host->transportt);
 202
 203         spin_unlock_irq(host->host_lock);
 204
 205         {
 206                 struct sas_ha_struct *sas_ha = dev->port->ha;
 207                 struct sas_task *task;
 208
 209                 res = -ENOMEM;
 210                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
 211                 if (!task)
 212                         goto out;
 213
 214                 cmd->scsi_done = scsi_done;
 215                 /* Queue up, Direct Mode or Task Collector Mode. */
 216                 if (sas_ha->lldd_max_execute_num < 2)
 217                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 218                 else
 219                         res = sas_queue_up(task);
 220
 221                 /* Examine */
 222                 if (res) {
 223                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 224                         ASSIGN_SAS_TASK(cmd, NULL);
 225                         sas_free_task(task);
 226                         if (res == -SAS_QUEUE_FULL) {
 227                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 228                                 res = 0;
 229                                 scsi_done(cmd);
 230                         }
 231                         goto out;
 232                 }
 233         }
 234 out:
 235         spin_lock_irq(host->host_lock);
 236         return res;
 237 }
 238
 239 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 240 {
 241         struct scsi_cmnd *cmd, *n;
 242
 243         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 244                 if (cmd == my_cmd)
 245                         list_del_init(&cmd->eh_entry);
 246         }
 247 }
 248
 249 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 250                                      struct domain_device *dev)
 251 {
 252         struct scsi_cmnd *cmd, *n;
 253
 254         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 255                 struct domain_device *x = cmd_to_domain_dev(cmd);
 256
 257                 if (x == dev)
 258                         list_del_init(&cmd->eh_entry);
 259         }
 260 }
 261
 262 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 263                                       struct asd_sas_port *port)
 264 {
 265         struct scsi_cmnd *cmd, *n;
 266
 267         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 268                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 269                 struct asd_sas_port *x = dev->port;
 270
 271                 if (x == port)
 272                         list_del_init(&cmd->eh_entry);
 273         }
 274 }
 275
 276 enum task_disposition {
 277         TASK_IS_DONE,
 278         TASK_IS_ABORTED,
 279         TASK_IS_AT_LU,
 280         TASK_IS_NOT_AT_LU,
 281 };
 282
 283 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 284 {
 285         struct sas_ha_struct *ha = task->dev->port->ha;
 286         unsigned long flags;
 287         int i, res;
 288         struct sas_internal *si =
 289                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 290
 291         if (ha->lldd_max_execute_num > 1) {
 292                 struct scsi_core *core = &ha->core;
 293                 struct sas_task *t, *n;
 294
 295                 spin_lock_irqsave(&core->task_queue_lock, flags);
 296                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 297                         if (task == t) {
 298                                 list_del_init(&t->list);
 299                                 spin_unlock_irqrestore(&core->task_queue_lock,
 300                                                        flags);
 301                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 302                                             "task_queue\n",
 303                                             __FUNCTION__, task);
 304                                 return TASK_IS_ABORTED;
 305                         }
 306                 }
 307                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 308         }
 309
 310         for (i = 0; i < 5; i++) {
 311                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 312                 res = si->dft->lldd_abort_task(task);
 313
 314                 spin_lock_irqsave(&task->task_state_lock, flags);
 315                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 316                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 317                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 318                                     task);
 319                         return TASK_IS_DONE;
 320                 }
 321                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 322
 323                 if (res == TMF_RESP_FUNC_COMPLETE) {
 324                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 325                                     __FUNCTION__, task);
 326                         return TASK_IS_ABORTED;
 327                 } else if (si->dft->lldd_query_task) {
 328                         SAS_DPRINTK("%s: querying task 0x%p\n",
 329                                     __FUNCTION__, task);
 330                         res = si->dft->lldd_query_task(task);
 331                         if (res == TMF_RESP_FUNC_SUCC) {
 332                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 333                                             __FUNCTION__, task);
 334                                 return TASK_IS_AT_LU;
 335                         } else if (res == TMF_RESP_FUNC_COMPLETE) {
 336                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 337                                             __FUNCTION__, task);
 338                                 return TASK_IS_NOT_AT_LU;
 339                         }
 340                 }
 341         }
 342         return res;
 343 }
 344
 345 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 346 {
 347         int res = TMF_RESP_FUNC_FAILED;
 348         struct scsi_lun lun;
 349         struct sas_internal *i =
 350                 to_sas_internal(dev->port->ha->core.shost->transportt);
 351
 352         int_to_scsilun(cmd->device->lun, &lun);
 353
 354         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 355                     SAS_ADDR(dev->sas_addr),
 356                     cmd->device->lun);
 357
 358         if (i->dft->lldd_abort_task_set)
 359                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 360
 361         if (res == TMF_RESP_FUNC_FAILED) {
 362                 if (i->dft->lldd_clear_task_set)
 363                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 364         }
 365
 366         if (res == TMF_RESP_FUNC_FAILED) {
 367                 if (i->dft->lldd_lu_reset)
 368                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 369         }
 370
 371         return res;
 372 }
 373
 374 static int sas_recover_I_T(struct domain_device *dev)
 375 {
 376         int res = TMF_RESP_FUNC_FAILED;
 377         struct sas_internal *i =
 378                 to_sas_internal(dev->port->ha->core.shost->transportt);
 379
 380         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 381                     SAS_ADDR(dev->sas_addr));
 382
 383         if (i->dft->lldd_I_T_nexus_reset)
 384                 res = i->dft->lldd_I_T_nexus_reset(dev);
 385
 386         return res;
 387 }
 388
 389 void sas_scsi_recover_host(struct Scsi_Host *shost)
 390 {
 391         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 392         unsigned long flags;
 393         LIST_HEAD(error_q);
 394         struct scsi_cmnd *cmd, *n;
 395         enum task_disposition res = TASK_IS_DONE;
 396         int tmf_resp;
 397         struct sas_internal *i = to_sas_internal(shost->transportt);
 398
 399         spin_lock_irqsave(shost->host_lock, flags);
 400         list_splice_init(&shost->eh_cmd_q, &error_q);
 401         spin_unlock_irqrestore(shost->host_lock, flags);
 402
 403         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 404
 405         /* All tasks on this list were marked SAS_TASK_STATE_ABORTED
 406          * by sas_scsi_timed_out() callback.
 407          */
 408 Again:
 409         SAS_DPRINTK("going over list...\n");
 410         list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
 411                 struct sas_task *task = TO_SAS_TASK(cmd);
 412
 413                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 414                 list_del_init(&cmd->eh_entry);
 415                 res = sas_scsi_find_task(task);
 416
 417                 cmd->eh_eflags = 0;
 418                 shost->host_failed--;
 419
 420                 switch (res) {
 421                 case TASK_IS_DONE:
 422                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 423                                     task);
 424                         task->task_done(task);
 425                         continue;
 426                 case TASK_IS_ABORTED:
 427                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 428                                     __FUNCTION__, task);
 429                         task->task_done(task);
 430                         continue;
 431                 case TASK_IS_AT_LU:
 432                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 433                         tmf_resp = sas_recover_lu(task->dev, cmd);
 434                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 435                                 SAS_DPRINTK("dev %016llx LU %x is "
 436                                             "recovered\n",
 437                                             SAS_ADDR(task->dev),
 438                                             cmd->device->lun);
 439                                 task->task_done(task);
 440                                 sas_scsi_clear_queue_lu(&error_q, cmd);
 441                                 goto Again;
 442                         }
 443                         /* fallthrough */
 444                 case TASK_IS_NOT_AT_LU:
 445                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 446                                     task);
 447                         tmf_resp = sas_recover_I_T(task->dev);
 448                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 449                                 SAS_DPRINTK("I_T %016llx recovered\n",
 450                                             SAS_ADDR(task->dev->sas_addr));
 451                                 task->task_done(task);
 452                                 sas_scsi_clear_queue_I_T(&error_q, task->dev);
 453                                 goto Again;
 454                         }
 455                         /* Hammer time :-) */
 456                         if (i->dft->lldd_clear_nexus_port) {
 457                                 struct asd_sas_port *port = task->dev->port;
 458                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 459                                             port->id);
 460                                 res = i->dft->lldd_clear_nexus_port(port);
 461                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 462                                         SAS_DPRINTK("clear nexus port:%d "
 463                                                     "succeeded\n", port->id);
 464                                         task->task_done(task);
 465                                         sas_scsi_clear_queue_port(&error_q,
 466                                                                   port);
 467                                         goto Again;
 468                                 }
 469                         }
 470                         if (i->dft->lldd_clear_nexus_ha) {
 471                                 SAS_DPRINTK("clear nexus ha\n");
 472                                 res = i->dft->lldd_clear_nexus_ha(ha);
 473                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 474                                         SAS_DPRINTK("clear nexus ha "
 475                                                     "succeeded\n");
 476                                         task->task_done(task);
 477                                         goto out;
 478                                 }
 479                         }
 480                         /* If we are here -- this means that no amount
 481                          * of effort could recover from errors.  Quite
 482                          * possibly the HA just disappeared.
 483                          */
 484                         SAS_DPRINTK("error from  device %llx, LUN %x "
 485                                     "couldn't be recovered in any way\n",
 486                                     SAS_ADDR(task->dev->sas_addr),
 487                                     cmd->device->lun);
 488
 489                         task->task_done(task);
 490                         goto clear_q;
 491                 }
 492         }
 493 out:
 494         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 495         return;
 496 clear_q:
 497         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 498         list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
 499                 struct sas_task *task = TO_SAS_TASK(cmd);
 500                 list_del_init(&cmd->eh_entry);
 501                 task->task_done(task);
 502         }
 503 }
 504
 505 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 506 {
 507         struct sas_task *task = TO_SAS_TASK(cmd);
 508         unsigned long flags;
 509
 510         if (!task) {
 511                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 512                             cmd, task);
 513                 return EH_HANDLED;
 514         }
 515
 516         spin_lock_irqsave(&task->task_state_lock, flags);
 517         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 518                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 519                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 520                             cmd, task);
 521                 return EH_HANDLED;
 522         }
 523         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 524         spin_unlock_irqrestore(&task->task_state_lock, flags);
 525
 526         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 527                     cmd, task);
 528
 529         return EH_NOT_HANDLED;
 530 }
 531
 532 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 533 {
 534         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 535         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 536         struct domain_device *found_dev = NULL;
 537         int i;
 538
 539         spin_lock(&ha->phy_port_lock);
 540         for (i = 0; i < ha->num_phys; i++) {
 541                 struct asd_sas_port *port = ha->sas_port[i];
 542                 struct domain_device *dev;
 543
 544                 spin_lock(&port->dev_list_lock);
 545                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 546                         if (rphy == dev->rphy) {
 547                                 found_dev = dev;
 548                                 spin_unlock(&port->dev_list_lock);
 549                                 goto found;
 550                         }
 551                 }
 552                 spin_unlock(&port->dev_list_lock);
 553         }
 554  found:
 555         spin_unlock(&ha->phy_port_lock);
 556
 557         return found_dev;
 558 }
 559
 560 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 561 {
 562         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 563
 564         return sas_find_dev_by_rphy(rphy);
 565 }
 566
 567 int sas_target_alloc(struct scsi_target *starget)
 568 {
 569         struct domain_device *found_dev = sas_find_target(starget);
 570
 571         if (!found_dev)
 572                 return -ENODEV;
 573
 574         starget->hostdata = found_dev;
 575         return 0;
 576 }
 577
 578 #define SAS_DEF_QD 32
 579 #define SAS_MAX_QD 64
 580
 581 int sas_slave_configure(struct scsi_device *scsi_dev)
 582 {
 583         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 584         struct sas_ha_struct *sas_ha;
 585
 586         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 587
 588         sas_ha = dev->port->ha;
 589
 590         sas_read_port_mode_page(scsi_dev);
 591
 592         if (scsi_dev->tagged_supported) {
 593                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 594                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 595         } else {
 596                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 597                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 598                             scsi_dev->lun);
 599                 scsi_dev->tagged_supported = 0;
 600                 scsi_set_tag_type(scsi_dev, 0);
 601                 scsi_deactivate_tcq(scsi_dev, 1);
 602         }
 603
 604         return 0;
 605 }
 606
 607 void sas_slave_destroy(struct scsi_device *scsi_dev)
 608 {
 609 }
 610
 611 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
 612 {
 613         int res = min(new_depth, SAS_MAX_QD);
 614
 615         if (scsi_dev->tagged_supported)
 616                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 617                                         res);
 618         else {
 619                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 620                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 621                            SAS_ADDR(dev->sas_addr),
 622                            scsi_dev->lun);
 623                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 624                 res = 1;
 625         }
 626
 627         return res;
 628 }
 629
 630 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 631 {
 632         if (!scsi_dev->tagged_supported)
 633                 return 0;
 634
 635         scsi_deactivate_tcq(scsi_dev, 1);
 636
 637         scsi_set_tag_type(scsi_dev, qt);
 638         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 639
 640         return qt;
 641 }
 642
 643 int sas_bios_param(struct scsi_device *scsi_dev,
 644                           struct block_device *bdev,
 645                           sector_t capacity, int *hsc)
 646 {
 647         hsc[0] = 255;
 648         hsc[1] = 63;
 649         sector_div(capacity, 255*63);
 650         hsc[2] = capacity;
 651
 652         return 0;
 653 }
 654
 655 /* ---------- Task Collector Thread implementation ---------- */
 656
 657 static void sas_queue(struct sas_ha_struct *sas_ha)
 658 {
 659         struct scsi_core *core = &sas_ha->core;
 660         unsigned long flags;
 661         LIST_HEAD(q);
 662         int can_queue;
 663         int res;
 664         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 665
 666         spin_lock_irqsave(&core->task_queue_lock, flags);
 667         while (!core->queue_thread_kill &&
 668                !list_empty(&core->task_queue)) {
 669
 670                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 671                 if (can_queue >= 0) {
 672                         can_queue = core->task_queue_size;
 673                         list_splice_init(&core->task_queue, &q);
 674                 } else {
 675                         struct list_head *a, *n;
 676
 677                         can_queue = sas_ha->lldd_queue_size;
 678                         list_for_each_safe(a, n, &core->task_queue) {
 679                                 list_move_tail(a, &q);
 680                                 if (--can_queue == 0)
 681                                         break;
 682                         }
 683                         can_queue = sas_ha->lldd_queue_size;
 684                 }
 685                 core->task_queue_size -= can_queue;
 686                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 687                 {
 688                         struct sas_task *task = list_entry(q.next,
 689                                                            struct sas_task,
 690                                                            list);
 691                         list_del_init(&q);
 692                         res = i->dft->lldd_execute_task(task, can_queue,
 693                                                         GFP_KERNEL);
 694                         if (unlikely(res))
 695                                 __list_add(&q, task->list.prev, &task->list);
 696                 }
 697                 spin_lock_irqsave(&core->task_queue_lock, flags);
 698                 if (res) {
 699                         list_splice_init(&q, &core->task_queue); /*at head*/
 700                         core->task_queue_size += can_queue;
 701                 }
 702         }
 703         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 704 }
 705
 706 static DECLARE_COMPLETION(queue_th_comp);
 707
 708 /**
 709  * sas_queue_thread -- The Task Collector thread
 710  * @_sas_ha: pointer to struct sas_ha
 711  */
 712 static int sas_queue_thread(void *_sas_ha)
 713 {
 714         struct sas_ha_struct *sas_ha = _sas_ha;
 715         struct scsi_core *core = &sas_ha->core;
 716
 717         daemonize("sas_queue_%d", core->shost->host_no);
 718         current->flags |= PF_NOFREEZE;
 719
 720         complete(&queue_th_comp);
 721
 722         while (1) {
 723                 down_interruptible(&core->queue_thread_sema);
 724                 sas_queue(sas_ha);
 725                 if (core->queue_thread_kill)
 726                         break;
 727         }
 728
 729         complete(&queue_th_comp);
 730
 731         return 0;
 732 }
 733
 734 int sas_init_queue(struct sas_ha_struct *sas_ha)
 735 {
 736         int res;
 737         struct scsi_core *core = &sas_ha->core;
 738
 739         spin_lock_init(&core->task_queue_lock);
 740         core->task_queue_size = 0;
 741         INIT_LIST_HEAD(&core->task_queue);
 742         init_MUTEX_LOCKED(&core->queue_thread_sema);
 743
 744         res = kernel_thread(sas_queue_thread, sas_ha, 0);
 745         if (res >= 0)
 746                 wait_for_completion(&queue_th_comp);
 747
 748         return res < 0 ? res : 0;
 749 }
 750
 751 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 752 {
 753         unsigned long flags;
 754         struct scsi_core *core = &sas_ha->core;
 755         struct sas_task *task, *n;
 756
 757         init_completion(&queue_th_comp);
 758         core->queue_thread_kill = 1;
 759         up(&core->queue_thread_sema);
 760         wait_for_completion(&queue_th_comp);
 761
 762         if (!list_empty(&core->task_queue))
 763                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 764                             SAS_ADDR(sas_ha->sas_addr));
 765
 766         spin_lock_irqsave(&core->task_queue_lock, flags);
 767         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 768                 struct scsi_cmnd *cmd = task->uldd_task;
 769
 770                 list_del_init(&task->list);
 771
 772                 ASSIGN_SAS_TASK(cmd, NULL);
 773                 sas_free_task(task);
 774                 cmd->result = DID_ABORT << 16;
 775                 cmd->scsi_done(cmd);
 776         }
 777         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 778 }
 779
 780 EXPORT_SYMBOL_GPL(sas_queuecommand);
 781 EXPORT_SYMBOL_GPL(sas_target_alloc);
 782 EXPORT_SYMBOL_GPL(sas_slave_configure);
 783 EXPORT_SYMBOL_GPL(sas_slave_destroy);
 784 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
 785 EXPORT_SYMBOL_GPL(sas_change_queue_type);
 786 EXPORT_SYMBOL_GPL(sas_bios_param);