SAFE public projects git trees. - safe/jmp/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_eh.h>
  33 #include <scsi/scsi_transport.h>
  34 #include <scsi/scsi_transport_sas.h>
  35 #include "../scsi_sas_internal.h"
  36
  37 #include <linux/err.h>
  38 #include <linux/blkdev.h>
  39 #include <linux/scatterlist.h>
  40
  41 /* ---------- SCSI Host glue ---------- */
  42
  43 #define TO_SAS_TASK(_scsi_cmd)  ((void *)(_scsi_cmd)->host_scribble)
  44 #define ASSIGN_SAS_TASK(_sc, _t) do { (_sc)->host_scribble = (void *) _t; } while (0)
  45
  46 static void sas_scsi_task_done(struct sas_task *task)
  47 {
  48         struct task_status_struct *ts = &task->task_status;
  49         struct scsi_cmnd *sc = task->uldd_task;
  50         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(sc->device->host);
  51         unsigned ts_flags = task->task_state_flags;
  52         int hs = 0, stat = 0;
  53
  54         if (unlikely(!sc)) {
  55                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  56                 list_del_init(&task->list);
  57                 sas_free_task(task);
  58                 return;
  59         }
  60
  61         if (ts->resp == SAS_TASK_UNDELIVERED) {
  62                 /* transport error */
  63                 hs = DID_NO_CONNECT;
  64         } else { /* ts->resp == SAS_TASK_COMPLETE */
  65                 /* task delivered, what happened afterwards? */
  66                 switch (ts->stat) {
  67                 case SAS_DEV_NO_RESPONSE:
  68                 case SAS_INTERRUPTED:
  69                 case SAS_PHY_DOWN:
  70                 case SAS_NAK_R_ERR:
  71                 case SAS_OPEN_TO:
  72                         hs = DID_NO_CONNECT;
  73                         break;
  74                 case SAS_DATA_UNDERRUN:
  75                         sc->resid = ts->residual;
  76                         if (sc->request_bufflen - sc->resid < sc->underflow)
  77                                 hs = DID_ERROR;
  78                         break;
  79                 case SAS_DATA_OVERRUN:
  80                         hs = DID_ERROR;
  81                         break;
  82                 case SAS_QUEUE_FULL:
  83                         hs = DID_SOFT_ERROR; /* retry */
  84                         break;
  85                 case SAS_DEVICE_UNKNOWN:
  86                         hs = DID_BAD_TARGET;
  87                         break;
  88                 case SAS_SG_ERR:
  89                         hs = DID_PARITY;
  90                         break;
  91                 case SAS_OPEN_REJECT:
  92                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
  93                                 hs = DID_SOFT_ERROR; /* retry */
  94                         else
  95                                 hs = DID_ERROR;
  96                         break;
  97                 case SAS_PROTO_RESPONSE:
  98                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
  99                                     "task; please report this\n",
 100                                     task->dev->port->ha->sas_ha_name);
 101                         break;
 102                 case SAS_ABORTED_TASK:
 103                         hs = DID_ABORT;
 104                         break;
 105                 case SAM_CHECK_COND:
 106                         memcpy(sc->sense_buffer, ts->buf,
 107                                max(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 108                         stat = SAM_CHECK_COND;
 109                         break;
 110                 default:
 111                         stat = ts->stat;
 112                         break;
 113                 }
 114         }
 115         ASSIGN_SAS_TASK(sc, NULL);
 116         sc->result = (hs << 16) | stat;
 117         list_del_init(&task->list);
 118         sas_free_task(task);
 119         /* This is very ugly but this is how SCSI Core works. */
 120         if (ts_flags & SAS_TASK_STATE_ABORTED)
 121                 scsi_eh_finish_cmd(sc, &sas_ha->eh_done_q);
 122         else
 123                 sc->scsi_done(sc);
 124 }
 125
 126 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
 127 {
 128         enum task_attribute ta = TASK_ATTR_SIMPLE;
 129         if (cmd->request && blk_rq_tagged(cmd->request)) {
 130                 if (cmd->device->ordered_tags &&
 131                     (cmd->request->cmd_flags & REQ_HARDBARRIER))
 132                         ta = TASK_ATTR_HOQ;
 133         }
 134         return ta;
 135 }
 136
 137 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 138                                                struct domain_device *dev,
 139                                                gfp_t gfp_flags)
 140 {
 141         struct sas_task *task = sas_alloc_task(gfp_flags);
 142         struct scsi_lun lun;
 143
 144         if (!task)
 145                 return NULL;
 146
 147         *(u32 *)cmd->sense_buffer = 0;
 148         task->uldd_task = cmd;
 149         ASSIGN_SAS_TASK(cmd, task);
 150
 151         task->dev = dev;
 152         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 153
 154         task->ssp_task.retry_count = 1;
 155         int_to_scsilun(cmd->device->lun, &lun);
 156         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 157         task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
 158         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 159
 160         task->scatter = cmd->request_buffer;
 161         task->num_scatter = cmd->use_sg;
 162         task->total_xfer_len = cmd->request_bufflen;
 163         task->data_dir = cmd->sc_data_direction;
 164
 165         task->task_done = sas_scsi_task_done;
 166
 167         return task;
 168 }
 169
 170 static int sas_queue_up(struct sas_task *task)
 171 {
 172         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 173         struct scsi_core *core = &sas_ha->core;
 174         unsigned long flags;
 175         LIST_HEAD(list);
 176
 177         spin_lock_irqsave(&core->task_queue_lock, flags);
 178         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 179                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 180                 return -SAS_QUEUE_FULL;
 181         }
 182         list_add_tail(&task->list, &core->task_queue);
 183         core->task_queue_size += 1;
 184         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 185         up(&core->queue_thread_sema);
 186
 187         return 0;
 188 }
 189
 190 /**
 191  * sas_queuecommand -- Enqueue a command for processing
 192  * @parameters: See SCSI Core documentation
 193  *
 194  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
 195  * call us without holding an IRQ spinlock...
 196  */
 197 int sas_queuecommand(struct scsi_cmnd *cmd,
 198                      void (*scsi_done)(struct scsi_cmnd *))
 199 {
 200         int res = 0;
 201         struct domain_device *dev = cmd_to_domain_dev(cmd);
 202         struct Scsi_Host *host = cmd->device->host;
 203         struct sas_internal *i = to_sas_internal(host->transportt);
 204
 205         spin_unlock_irq(host->host_lock);
 206
 207         {
 208                 struct sas_ha_struct *sas_ha = dev->port->ha;
 209                 struct sas_task *task;
 210
 211                 res = -ENOMEM;
 212                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
 213                 if (!task)
 214                         goto out;
 215
 216                 cmd->scsi_done = scsi_done;
 217                 /* Queue up, Direct Mode or Task Collector Mode. */
 218                 if (sas_ha->lldd_max_execute_num < 2)
 219                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 220                 else
 221                         res = sas_queue_up(task);
 222
 223                 /* Examine */
 224                 if (res) {
 225                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 226                         ASSIGN_SAS_TASK(cmd, NULL);
 227                         sas_free_task(task);
 228                         if (res == -SAS_QUEUE_FULL) {
 229                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 230                                 res = 0;
 231                                 scsi_done(cmd);
 232                         }
 233                         goto out;
 234                 }
 235         }
 236 out:
 237         spin_lock_irq(host->host_lock);
 238         return res;
 239 }
 240
 241 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 242 {
 243         struct scsi_cmnd *cmd, *n;
 244
 245         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 246                 if (cmd == my_cmd)
 247                         list_del_init(&cmd->eh_entry);
 248         }
 249 }
 250
 251 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 252                                      struct domain_device *dev)
 253 {
 254         struct scsi_cmnd *cmd, *n;
 255
 256         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 257                 struct domain_device *x = cmd_to_domain_dev(cmd);
 258
 259                 if (x == dev)
 260                         list_del_init(&cmd->eh_entry);
 261         }
 262 }
 263
 264 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 265                                       struct asd_sas_port *port)
 266 {
 267         struct scsi_cmnd *cmd, *n;
 268
 269         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 270                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 271                 struct asd_sas_port *x = dev->port;
 272
 273                 if (x == port)
 274                         list_del_init(&cmd->eh_entry);
 275         }
 276 }
 277
 278 enum task_disposition {
 279         TASK_IS_DONE,
 280         TASK_IS_ABORTED,
 281         TASK_IS_AT_LU,
 282         TASK_IS_NOT_AT_LU,
 283 };
 284
 285 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 286 {
 287         struct sas_ha_struct *ha = task->dev->port->ha;
 288         unsigned long flags;
 289         int i, res;
 290         struct sas_internal *si =
 291                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 292
 293         if (ha->lldd_max_execute_num > 1) {
 294                 struct scsi_core *core = &ha->core;
 295                 struct sas_task *t, *n;
 296
 297                 spin_lock_irqsave(&core->task_queue_lock, flags);
 298                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 299                         if (task == t) {
 300                                 list_del_init(&t->list);
 301                                 spin_unlock_irqrestore(&core->task_queue_lock,
 302                                                        flags);
 303                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 304                                             "task_queue\n",
 305                                             __FUNCTION__, task);
 306                                 return TASK_IS_ABORTED;
 307                         }
 308                 }
 309                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 310         }
 311
 312         spin_lock_irqsave(&task->task_state_lock, flags);
 313         if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) {
 314                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 315                 SAS_DPRINTK("%s: task 0x%p already aborted\n",
 316                             __FUNCTION__, task);
 317                 return TASK_IS_ABORTED;
 318         }
 319         spin_unlock_irqrestore(&task->task_state_lock, flags);
 320
 321         for (i = 0; i < 5; i++) {
 322                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 323                 res = si->dft->lldd_abort_task(task);
 324
 325                 spin_lock_irqsave(&task->task_state_lock, flags);
 326                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 327                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 328                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 329                                     task);
 330                         return TASK_IS_DONE;
 331                 }
 332                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 333
 334                 if (res == TMF_RESP_FUNC_COMPLETE) {
 335                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 336                                     __FUNCTION__, task);
 337                         return TASK_IS_ABORTED;
 338                 } else if (si->dft->lldd_query_task) {
 339                         SAS_DPRINTK("%s: querying task 0x%p\n",
 340                                     __FUNCTION__, task);
 341                         res = si->dft->lldd_query_task(task);
 342                         if (res == TMF_RESP_FUNC_SUCC) {
 343                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 344                                             __FUNCTION__, task);
 345                                 return TASK_IS_AT_LU;
 346                         } else if (res == TMF_RESP_FUNC_COMPLETE) {
 347                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 348                                             __FUNCTION__, task);
 349                                 return TASK_IS_NOT_AT_LU;
 350                         }
 351                 }
 352         }
 353         return res;
 354 }
 355
 356 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 357 {
 358         int res = TMF_RESP_FUNC_FAILED;
 359         struct scsi_lun lun;
 360         struct sas_internal *i =
 361                 to_sas_internal(dev->port->ha->core.shost->transportt);
 362
 363         int_to_scsilun(cmd->device->lun, &lun);
 364
 365         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 366                     SAS_ADDR(dev->sas_addr),
 367                     cmd->device->lun);
 368
 369         if (i->dft->lldd_abort_task_set)
 370                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 371
 372         if (res == TMF_RESP_FUNC_FAILED) {
 373                 if (i->dft->lldd_clear_task_set)
 374                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 375         }
 376
 377         if (res == TMF_RESP_FUNC_FAILED) {
 378                 if (i->dft->lldd_lu_reset)
 379                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 380         }
 381
 382         return res;
 383 }
 384
 385 static int sas_recover_I_T(struct domain_device *dev)
 386 {
 387         int res = TMF_RESP_FUNC_FAILED;
 388         struct sas_internal *i =
 389                 to_sas_internal(dev->port->ha->core.shost->transportt);
 390
 391         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 392                     SAS_ADDR(dev->sas_addr));
 393
 394         if (i->dft->lldd_I_T_nexus_reset)
 395                 res = i->dft->lldd_I_T_nexus_reset(dev);
 396
 397         return res;
 398 }
 399
 400 void sas_scsi_recover_host(struct Scsi_Host *shost)
 401 {
 402         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 403         unsigned long flags;
 404         LIST_HEAD(error_q);
 405         struct scsi_cmnd *cmd, *n;
 406         enum task_disposition res = TASK_IS_DONE;
 407         int tmf_resp;
 408         struct sas_internal *i = to_sas_internal(shost->transportt);
 409
 410         spin_lock_irqsave(shost->host_lock, flags);
 411         list_splice_init(&shost->eh_cmd_q, &error_q);
 412         spin_unlock_irqrestore(shost->host_lock, flags);
 413
 414         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 415
 416         /* All tasks on this list were marked SAS_TASK_STATE_ABORTED
 417          * by sas_scsi_timed_out() callback.
 418          */
 419 Again:
 420         SAS_DPRINTK("going over list...\n");
 421         list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
 422                 struct sas_task *task = TO_SAS_TASK(cmd);
 423                 list_del_init(&cmd->eh_entry);
 424
 425                 if (!task) {
 426                         SAS_DPRINTK("%s: taskless cmd?!\n", __FUNCTION__);
 427                         continue;
 428                 }
 429                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 430                 res = sas_scsi_find_task(task);
 431
 432                 cmd->eh_eflags = 0;
 433
 434                 switch (res) {
 435                 case TASK_IS_DONE:
 436                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 437                                     task);
 438                         task->task_done(task);
 439                         continue;
 440                 case TASK_IS_ABORTED:
 441                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 442                                     __FUNCTION__, task);
 443                         task->task_done(task);
 444                         continue;
 445                 case TASK_IS_AT_LU:
 446                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 447                         tmf_resp = sas_recover_lu(task->dev, cmd);
 448                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 449                                 SAS_DPRINTK("dev %016llx LU %x is "
 450                                             "recovered\n",
 451                                             SAS_ADDR(task->dev),
 452                                             cmd->device->lun);
 453                                 task->task_done(task);
 454                                 sas_scsi_clear_queue_lu(&error_q, cmd);
 455                                 goto Again;
 456                         }
 457                         /* fallthrough */
 458                 case TASK_IS_NOT_AT_LU:
 459                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 460                                     task);
 461                         tmf_resp = sas_recover_I_T(task->dev);
 462                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 463                                 SAS_DPRINTK("I_T %016llx recovered\n",
 464                                             SAS_ADDR(task->dev->sas_addr));
 465                                 task->task_done(task);
 466                                 sas_scsi_clear_queue_I_T(&error_q, task->dev);
 467                                 goto Again;
 468                         }
 469                         /* Hammer time :-) */
 470                         if (i->dft->lldd_clear_nexus_port) {
 471                                 struct asd_sas_port *port = task->dev->port;
 472                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 473                                             port->id);
 474                                 res = i->dft->lldd_clear_nexus_port(port);
 475                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 476                                         SAS_DPRINTK("clear nexus port:%d "
 477                                                     "succeeded\n", port->id);
 478                                         task->task_done(task);
 479                                         sas_scsi_clear_queue_port(&error_q,
 480                                                                   port);
 481                                         goto Again;
 482                                 }
 483                         }
 484                         if (i->dft->lldd_clear_nexus_ha) {
 485                                 SAS_DPRINTK("clear nexus ha\n");
 486                                 res = i->dft->lldd_clear_nexus_ha(ha);
 487                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 488                                         SAS_DPRINTK("clear nexus ha "
 489                                                     "succeeded\n");
 490                                         task->task_done(task);
 491                                         goto out;
 492                                 }
 493                         }
 494                         /* If we are here -- this means that no amount
 495                          * of effort could recover from errors.  Quite
 496                          * possibly the HA just disappeared.
 497                          */
 498                         SAS_DPRINTK("error from  device %llx, LUN %x "
 499                                     "couldn't be recovered in any way\n",
 500                                     SAS_ADDR(task->dev->sas_addr),
 501                                     cmd->device->lun);
 502
 503                         task->task_done(task);
 504                         goto clear_q;
 505                 }
 506         }
 507 out:
 508         scsi_eh_flush_done_q(&ha->eh_done_q);
 509         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 510         return;
 511 clear_q:
 512         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 513         list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
 514                 struct sas_task *task = TO_SAS_TASK(cmd);
 515                 list_del_init(&cmd->eh_entry);
 516                 task->task_done(task);
 517         }
 518 }
 519
 520 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 521 {
 522         struct sas_task *task = TO_SAS_TASK(cmd);
 523         unsigned long flags;
 524
 525         if (!task) {
 526                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: EH_HANDLED\n",
 527                             cmd, task);
 528                 return EH_HANDLED;
 529         }
 530
 531         spin_lock_irqsave(&task->task_state_lock, flags);
 532         if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) {
 533                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 534                 SAS_DPRINTK("command 0x%p, task 0x%p, aborted by initiator: "
 535                             "EH_NOT_HANDLED\n", cmd, task);
 536                 return EH_NOT_HANDLED;
 537         }
 538         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 539                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 540                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 541                             cmd, task);
 542                 return EH_HANDLED;
 543         }
 544         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 545         spin_unlock_irqrestore(&task->task_state_lock, flags);
 546
 547         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 548                     cmd, task);
 549
 550         return EH_NOT_HANDLED;
 551 }
 552
 553 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 554 {
 555         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 556         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 557         struct domain_device *found_dev = NULL;
 558         int i;
 559
 560         spin_lock(&ha->phy_port_lock);
 561         for (i = 0; i < ha->num_phys; i++) {
 562                 struct asd_sas_port *port = ha->sas_port[i];
 563                 struct domain_device *dev;
 564
 565                 spin_lock(&port->dev_list_lock);
 566                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 567                         if (rphy == dev->rphy) {
 568                                 found_dev = dev;
 569                                 spin_unlock(&port->dev_list_lock);
 570                                 goto found;
 571                         }
 572                 }
 573                 spin_unlock(&port->dev_list_lock);
 574         }
 575  found:
 576         spin_unlock(&ha->phy_port_lock);
 577
 578         return found_dev;
 579 }
 580
 581 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 582 {
 583         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 584
 585         return sas_find_dev_by_rphy(rphy);
 586 }
 587
 588 int sas_target_alloc(struct scsi_target *starget)
 589 {
 590         struct domain_device *found_dev = sas_find_target(starget);
 591
 592         if (!found_dev)
 593                 return -ENODEV;
 594
 595         starget->hostdata = found_dev;
 596         return 0;
 597 }
 598
 599 #define SAS_DEF_QD 32
 600 #define SAS_MAX_QD 64
 601
 602 int sas_slave_configure(struct scsi_device *scsi_dev)
 603 {
 604         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 605         struct sas_ha_struct *sas_ha;
 606
 607         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 608
 609         sas_ha = dev->port->ha;
 610
 611         sas_read_port_mode_page(scsi_dev);
 612
 613         if (scsi_dev->tagged_supported) {
 614                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 615                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 616         } else {
 617                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 618                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 619                             scsi_dev->lun);
 620                 scsi_dev->tagged_supported = 0;
 621                 scsi_set_tag_type(scsi_dev, 0);
 622                 scsi_deactivate_tcq(scsi_dev, 1);
 623         }
 624
 625         return 0;
 626 }
 627
 628 void sas_slave_destroy(struct scsi_device *scsi_dev)
 629 {
 630 }
 631
 632 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
 633 {
 634         int res = min(new_depth, SAS_MAX_QD);
 635
 636         if (scsi_dev->tagged_supported)
 637                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 638                                         res);
 639         else {
 640                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 641                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 642                            SAS_ADDR(dev->sas_addr),
 643                            scsi_dev->lun);
 644                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 645                 res = 1;
 646         }
 647
 648         return res;
 649 }
 650
 651 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 652 {
 653         if (!scsi_dev->tagged_supported)
 654                 return 0;
 655
 656         scsi_deactivate_tcq(scsi_dev, 1);
 657
 658         scsi_set_tag_type(scsi_dev, qt);
 659         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 660
 661         return qt;
 662 }
 663
 664 int sas_bios_param(struct scsi_device *scsi_dev,
 665                           struct block_device *bdev,
 666                           sector_t capacity, int *hsc)
 667 {
 668         hsc[0] = 255;
 669         hsc[1] = 63;
 670         sector_div(capacity, 255*63);
 671         hsc[2] = capacity;
 672
 673         return 0;
 674 }
 675
 676 /* ---------- Task Collector Thread implementation ---------- */
 677
 678 static void sas_queue(struct sas_ha_struct *sas_ha)
 679 {
 680         struct scsi_core *core = &sas_ha->core;
 681         unsigned long flags;
 682         LIST_HEAD(q);
 683         int can_queue;
 684         int res;
 685         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 686
 687         spin_lock_irqsave(&core->task_queue_lock, flags);
 688         while (!core->queue_thread_kill &&
 689                !list_empty(&core->task_queue)) {
 690
 691                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 692                 if (can_queue >= 0) {
 693                         can_queue = core->task_queue_size;
 694                         list_splice_init(&core->task_queue, &q);
 695                 } else {
 696                         struct list_head *a, *n;
 697
 698                         can_queue = sas_ha->lldd_queue_size;
 699                         list_for_each_safe(a, n, &core->task_queue) {
 700                                 list_move_tail(a, &q);
 701                                 if (--can_queue == 0)
 702                                         break;
 703                         }
 704                         can_queue = sas_ha->lldd_queue_size;
 705                 }
 706                 core->task_queue_size -= can_queue;
 707                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 708                 {
 709                         struct sas_task *task = list_entry(q.next,
 710                                                            struct sas_task,
 711                                                            list);
 712                         list_del_init(&q);
 713                         res = i->dft->lldd_execute_task(task, can_queue,
 714                                                         GFP_KERNEL);
 715                         if (unlikely(res))
 716                                 __list_add(&q, task->list.prev, &task->list);
 717                 }
 718                 spin_lock_irqsave(&core->task_queue_lock, flags);
 719                 if (res) {
 720                         list_splice_init(&q, &core->task_queue); /*at head*/
 721                         core->task_queue_size += can_queue;
 722                 }
 723         }
 724         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 725 }
 726
 727 static DECLARE_COMPLETION(queue_th_comp);
 728
 729 /**
 730  * sas_queue_thread -- The Task Collector thread
 731  * @_sas_ha: pointer to struct sas_ha
 732  */
 733 static int sas_queue_thread(void *_sas_ha)
 734 {
 735         struct sas_ha_struct *sas_ha = _sas_ha;
 736         struct scsi_core *core = &sas_ha->core;
 737
 738         daemonize("sas_queue_%d", core->shost->host_no);
 739         current->flags |= PF_NOFREEZE;
 740
 741         complete(&queue_th_comp);
 742
 743         while (1) {
 744                 down_interruptible(&core->queue_thread_sema);
 745                 sas_queue(sas_ha);
 746                 if (core->queue_thread_kill)
 747                         break;
 748         }
 749
 750         complete(&queue_th_comp);
 751
 752         return 0;
 753 }
 754
 755 int sas_init_queue(struct sas_ha_struct *sas_ha)
 756 {
 757         int res;
 758         struct scsi_core *core = &sas_ha->core;
 759
 760         spin_lock_init(&core->task_queue_lock);
 761         core->task_queue_size = 0;
 762         INIT_LIST_HEAD(&core->task_queue);
 763         init_MUTEX_LOCKED(&core->queue_thread_sema);
 764
 765         res = kernel_thread(sas_queue_thread, sas_ha, 0);
 766         if (res >= 0)
 767                 wait_for_completion(&queue_th_comp);
 768
 769         return res < 0 ? res : 0;
 770 }
 771
 772 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 773 {
 774         unsigned long flags;
 775         struct scsi_core *core = &sas_ha->core;
 776         struct sas_task *task, *n;
 777
 778         init_completion(&queue_th_comp);
 779         core->queue_thread_kill = 1;
 780         up(&core->queue_thread_sema);
 781         wait_for_completion(&queue_th_comp);
 782
 783         if (!list_empty(&core->task_queue))
 784                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 785                             SAS_ADDR(sas_ha->sas_addr));
 786
 787         spin_lock_irqsave(&core->task_queue_lock, flags);
 788         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 789                 struct scsi_cmnd *cmd = task->uldd_task;
 790
 791                 list_del_init(&task->list);
 792
 793                 ASSIGN_SAS_TASK(cmd, NULL);
 794                 sas_free_task(task);
 795                 cmd->result = DID_ABORT << 16;
 796                 cmd->scsi_done(cmd);
 797         }
 798         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 799 }
 800
 801 EXPORT_SYMBOL_GPL(sas_queuecommand);
 802 EXPORT_SYMBOL_GPL(sas_target_alloc);
 803 EXPORT_SYMBOL_GPL(sas_slave_configure);
 804 EXPORT_SYMBOL_GPL(sas_slave_destroy);
 805 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
 806 EXPORT_SYMBOL_GPL(sas_change_queue_type);
 807 EXPORT_SYMBOL_GPL(sas_bios_param);