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 #include "../scsi_transport_api.h"
  37
  38 #include <linux/err.h>
  39 #include <linux/blkdev.h>
  40 #include <linux/scatterlist.h>
  41
  42 /* ---------- SCSI Host glue ---------- */
  43
  44 #define TO_SAS_TASK(_scsi_cmd)  ((void *)(_scsi_cmd)->host_scribble)
  45 #define ASSIGN_SAS_TASK(_sc, _t) do { (_sc)->host_scribble = (void *) _t; } while (0)
  46
  47 static void sas_scsi_task_done(struct sas_task *task)
  48 {
  49         struct task_status_struct *ts = &task->task_status;
  50         struct scsi_cmnd *sc = task->uldd_task;
  51         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(sc->device->host);
  52         unsigned ts_flags = task->task_state_flags;
  53         int hs = 0, stat = 0;
  54
  55         if (unlikely(!sc)) {
  56                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  57                 list_del_init(&task->list);
  58                 sas_free_task(task);
  59                 return;
  60         }
  61
  62         if (ts->resp == SAS_TASK_UNDELIVERED) {
  63                 /* transport error */
  64                 hs = DID_NO_CONNECT;
  65         } else { /* ts->resp == SAS_TASK_COMPLETE */
  66                 /* task delivered, what happened afterwards? */
  67                 switch (ts->stat) {
  68                 case SAS_DEV_NO_RESPONSE:
  69                 case SAS_INTERRUPTED:
  70                 case SAS_PHY_DOWN:
  71                 case SAS_NAK_R_ERR:
  72                 case SAS_OPEN_TO:
  73                         hs = DID_NO_CONNECT;
  74                         break;
  75                 case SAS_DATA_UNDERRUN:
  76                         sc->resid = ts->residual;
  77                         if (sc->request_bufflen - sc->resid < sc->underflow)
  78                                 hs = DID_ERROR;
  79                         break;
  80                 case SAS_DATA_OVERRUN:
  81                         hs = DID_ERROR;
  82                         break;
  83                 case SAS_QUEUE_FULL:
  84                         hs = DID_SOFT_ERROR; /* retry */
  85                         break;
  86                 case SAS_DEVICE_UNKNOWN:
  87                         hs = DID_BAD_TARGET;
  88                         break;
  89                 case SAS_SG_ERR:
  90                         hs = DID_PARITY;
  91                         break;
  92                 case SAS_OPEN_REJECT:
  93                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
  94                                 hs = DID_SOFT_ERROR; /* retry */
  95                         else
  96                                 hs = DID_ERROR;
  97                         break;
  98                 case SAS_PROTO_RESPONSE:
  99                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
 100                                     "task; please report this\n",
 101                                     task->dev->port->ha->sas_ha_name);
 102                         break;
 103                 case SAS_ABORTED_TASK:
 104                         hs = DID_ABORT;
 105                         break;
 106                 case SAM_CHECK_COND:
 107                         memcpy(sc->sense_buffer, ts->buf,
 108                                max(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 109                         stat = SAM_CHECK_COND;
 110                         break;
 111                 default:
 112                         stat = ts->stat;
 113                         break;
 114                 }
 115         }
 116         ASSIGN_SAS_TASK(sc, NULL);
 117         sc->result = (hs << 16) | stat;
 118         list_del_init(&task->list);
 119         sas_free_task(task);
 120         /* This is very ugly but this is how SCSI Core works. */
 121         if (ts_flags & SAS_TASK_STATE_ABORTED)
 122                 scsi_eh_finish_cmd(sc, &sas_ha->eh_done_q);
 123         else
 124                 sc->scsi_done(sc);
 125 }
 126
 127 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
 128 {
 129         enum task_attribute ta = TASK_ATTR_SIMPLE;
 130         if (cmd->request && blk_rq_tagged(cmd->request)) {
 131                 if (cmd->device->ordered_tags &&
 132                     (cmd->request->cmd_flags & REQ_HARDBARRIER))
 133                         ta = TASK_ATTR_HOQ;
 134         }
 135         return ta;
 136 }
 137
 138 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 139                                                struct domain_device *dev,
 140                                                gfp_t gfp_flags)
 141 {
 142         struct sas_task *task = sas_alloc_task(gfp_flags);
 143         struct scsi_lun lun;
 144
 145         if (!task)
 146                 return NULL;
 147
 148         *(u32 *)cmd->sense_buffer = 0;
 149         task->uldd_task = cmd;
 150         ASSIGN_SAS_TASK(cmd, task);
 151
 152         task->dev = dev;
 153         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 154
 155         task->ssp_task.retry_count = 1;
 156         int_to_scsilun(cmd->device->lun, &lun);
 157         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 158         task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
 159         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 160
 161         task->scatter = cmd->request_buffer;
 162         task->num_scatter = cmd->use_sg;
 163         task->total_xfer_len = cmd->request_bufflen;
 164         task->data_dir = cmd->sc_data_direction;
 165
 166         task->task_done = sas_scsi_task_done;
 167
 168         return task;
 169 }
 170
 171 static int sas_queue_up(struct sas_task *task)
 172 {
 173         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 174         struct scsi_core *core = &sas_ha->core;
 175         unsigned long flags;
 176         LIST_HEAD(list);
 177
 178         spin_lock_irqsave(&core->task_queue_lock, flags);
 179         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 180                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 181                 return -SAS_QUEUE_FULL;
 182         }
 183         list_add_tail(&task->list, &core->task_queue);
 184         core->task_queue_size += 1;
 185         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 186         up(&core->queue_thread_sema);
 187
 188         return 0;
 189 }
 190
 191 /**
 192  * sas_queuecommand -- Enqueue a command for processing
 193  * @parameters: See SCSI Core documentation
 194  *
 195  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
 196  * call us without holding an IRQ spinlock...
 197  */
 198 int sas_queuecommand(struct scsi_cmnd *cmd,
 199                      void (*scsi_done)(struct scsi_cmnd *))
 200 {
 201         int res = 0;
 202         struct domain_device *dev = cmd_to_domain_dev(cmd);
 203         struct Scsi_Host *host = cmd->device->host;
 204         struct sas_internal *i = to_sas_internal(host->transportt);
 205
 206         spin_unlock_irq(host->host_lock);
 207
 208         {
 209                 struct sas_ha_struct *sas_ha = dev->port->ha;
 210                 struct sas_task *task;
 211
 212                 res = -ENOMEM;
 213                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
 214                 if (!task)
 215                         goto out;
 216
 217                 cmd->scsi_done = scsi_done;
 218                 /* Queue up, Direct Mode or Task Collector Mode. */
 219                 if (sas_ha->lldd_max_execute_num < 2)
 220                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 221                 else
 222                         res = sas_queue_up(task);
 223
 224                 /* Examine */
 225                 if (res) {
 226                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 227                         ASSIGN_SAS_TASK(cmd, NULL);
 228                         sas_free_task(task);
 229                         if (res == -SAS_QUEUE_FULL) {
 230                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 231                                 res = 0;
 232                                 scsi_done(cmd);
 233                         }
 234                         goto out;
 235                 }
 236         }
 237 out:
 238         spin_lock_irq(host->host_lock);
 239         return res;
 240 }
 241
 242 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 243 {
 244         struct scsi_cmnd *cmd, *n;
 245
 246         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 247                 if (cmd == my_cmd)
 248                         list_del_init(&cmd->eh_entry);
 249         }
 250 }
 251
 252 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 253                                      struct domain_device *dev)
 254 {
 255         struct scsi_cmnd *cmd, *n;
 256
 257         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 258                 struct domain_device *x = cmd_to_domain_dev(cmd);
 259
 260                 if (x == dev)
 261                         list_del_init(&cmd->eh_entry);
 262         }
 263 }
 264
 265 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 266                                       struct asd_sas_port *port)
 267 {
 268         struct scsi_cmnd *cmd, *n;
 269
 270         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 271                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 272                 struct asd_sas_port *x = dev->port;
 273
 274                 if (x == port)
 275                         list_del_init(&cmd->eh_entry);
 276         }
 277 }
 278
 279 enum task_disposition {
 280         TASK_IS_DONE,
 281         TASK_IS_ABORTED,
 282         TASK_IS_AT_LU,
 283         TASK_IS_NOT_AT_LU,
 284 };
 285
 286 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 287 {
 288         struct sas_ha_struct *ha = task->dev->port->ha;
 289         unsigned long flags;
 290         int i, res;
 291         struct sas_internal *si =
 292                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 293
 294         if (ha->lldd_max_execute_num > 1) {
 295                 struct scsi_core *core = &ha->core;
 296                 struct sas_task *t, *n;
 297
 298                 spin_lock_irqsave(&core->task_queue_lock, flags);
 299                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 300                         if (task == t) {
 301                                 list_del_init(&t->list);
 302                                 spin_unlock_irqrestore(&core->task_queue_lock,
 303                                                        flags);
 304                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 305                                             "task_queue\n",
 306                                             __FUNCTION__, task);
 307                                 return TASK_IS_ABORTED;
 308                         }
 309                 }
 310                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 311         }
 312
 313         spin_lock_irqsave(&task->task_state_lock, flags);
 314         if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) {
 315                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 316                 SAS_DPRINTK("%s: task 0x%p already aborted\n",
 317                             __FUNCTION__, task);
 318                 return TASK_IS_ABORTED;
 319         }
 320         spin_unlock_irqrestore(&task->task_state_lock, flags);
 321
 322         for (i = 0; i < 5; i++) {
 323                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 324                 res = si->dft->lldd_abort_task(task);
 325
 326                 spin_lock_irqsave(&task->task_state_lock, flags);
 327                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 328                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 329                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 330                                     task);
 331                         return TASK_IS_DONE;
 332                 }
 333                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 334
 335                 if (res == TMF_RESP_FUNC_COMPLETE) {
 336                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 337                                     __FUNCTION__, task);
 338                         return TASK_IS_ABORTED;
 339                 } else if (si->dft->lldd_query_task) {
 340                         SAS_DPRINTK("%s: querying task 0x%p\n",
 341                                     __FUNCTION__, task);
 342                         res = si->dft->lldd_query_task(task);
 343                         if (res == TMF_RESP_FUNC_SUCC) {
 344                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 345                                             __FUNCTION__, task);
 346                                 return TASK_IS_AT_LU;
 347                         } else if (res == TMF_RESP_FUNC_COMPLETE) {
 348                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 349                                             __FUNCTION__, task);
 350                                 return TASK_IS_NOT_AT_LU;
 351                         }
 352                 }
 353         }
 354         return res;
 355 }
 356
 357 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 358 {
 359         int res = TMF_RESP_FUNC_FAILED;
 360         struct scsi_lun lun;
 361         struct sas_internal *i =
 362                 to_sas_internal(dev->port->ha->core.shost->transportt);
 363
 364         int_to_scsilun(cmd->device->lun, &lun);
 365
 366         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 367                     SAS_ADDR(dev->sas_addr),
 368                     cmd->device->lun);
 369
 370         if (i->dft->lldd_abort_task_set)
 371                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 372
 373         if (res == TMF_RESP_FUNC_FAILED) {
 374                 if (i->dft->lldd_clear_task_set)
 375                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 376         }
 377
 378         if (res == TMF_RESP_FUNC_FAILED) {
 379                 if (i->dft->lldd_lu_reset)
 380                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 381         }
 382
 383         return res;
 384 }
 385
 386 static int sas_recover_I_T(struct domain_device *dev)
 387 {
 388         int res = TMF_RESP_FUNC_FAILED;
 389         struct sas_internal *i =
 390                 to_sas_internal(dev->port->ha->core.shost->transportt);
 391
 392         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 393                     SAS_ADDR(dev->sas_addr));
 394
 395         if (i->dft->lldd_I_T_nexus_reset)
 396                 res = i->dft->lldd_I_T_nexus_reset(dev);
 397
 398         return res;
 399 }
 400
 401 void sas_scsi_recover_host(struct Scsi_Host *shost)
 402 {
 403         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 404         unsigned long flags;
 405         LIST_HEAD(error_q);
 406         struct scsi_cmnd *cmd, *n;
 407         enum task_disposition res = TASK_IS_DONE;
 408         int tmf_resp;
 409         struct sas_internal *i = to_sas_internal(shost->transportt);
 410
 411         spin_lock_irqsave(shost->host_lock, flags);
 412         list_splice_init(&shost->eh_cmd_q, &error_q);
 413         spin_unlock_irqrestore(shost->host_lock, flags);
 414
 415         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 416
 417         /* All tasks on this list were marked SAS_TASK_STATE_ABORTED
 418          * by sas_scsi_timed_out() callback.
 419          */
 420 Again:
 421         SAS_DPRINTK("going over list...\n");
 422         list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
 423                 struct sas_task *task = TO_SAS_TASK(cmd);
 424                 list_del_init(&cmd->eh_entry);
 425
 426                 if (!task) {
 427                         SAS_DPRINTK("%s: taskless cmd?!\n", __FUNCTION__);
 428                         continue;
 429                 }
 430                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 431                 res = sas_scsi_find_task(task);
 432
 433                 cmd->eh_eflags = 0;
 434
 435                 switch (res) {
 436                 case TASK_IS_DONE:
 437                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 438                                     task);
 439                         task->task_done(task);
 440                         continue;
 441                 case TASK_IS_ABORTED:
 442                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 443                                     __FUNCTION__, task);
 444                         task->task_done(task);
 445                         continue;
 446                 case TASK_IS_AT_LU:
 447                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 448                         tmf_resp = sas_recover_lu(task->dev, cmd);
 449                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 450                                 SAS_DPRINTK("dev %016llx LU %x is "
 451                                             "recovered\n",
 452                                             SAS_ADDR(task->dev),
 453                                             cmd->device->lun);
 454                                 task->task_done(task);
 455                                 sas_scsi_clear_queue_lu(&error_q, cmd);
 456                                 goto Again;
 457                         }
 458                         /* fallthrough */
 459                 case TASK_IS_NOT_AT_LU:
 460                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 461                                     task);
 462                         tmf_resp = sas_recover_I_T(task->dev);
 463                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 464                                 SAS_DPRINTK("I_T %016llx recovered\n",
 465                                             SAS_ADDR(task->dev->sas_addr));
 466                                 task->task_done(task);
 467                                 sas_scsi_clear_queue_I_T(&error_q, task->dev);
 468                                 goto Again;
 469                         }
 470                         /* Hammer time :-) */
 471                         if (i->dft->lldd_clear_nexus_port) {
 472                                 struct asd_sas_port *port = task->dev->port;
 473                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 474                                             port->id);
 475                                 res = i->dft->lldd_clear_nexus_port(port);
 476                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 477                                         SAS_DPRINTK("clear nexus port:%d "
 478                                                     "succeeded\n", port->id);
 479                                         task->task_done(task);
 480                                         sas_scsi_clear_queue_port(&error_q,
 481                                                                   port);
 482                                         goto Again;
 483                                 }
 484                         }
 485                         if (i->dft->lldd_clear_nexus_ha) {
 486                                 SAS_DPRINTK("clear nexus ha\n");
 487                                 res = i->dft->lldd_clear_nexus_ha(ha);
 488                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 489                                         SAS_DPRINTK("clear nexus ha "
 490                                                     "succeeded\n");
 491                                         task->task_done(task);
 492                                         goto out;
 493                                 }
 494                         }
 495                         /* If we are here -- this means that no amount
 496                          * of effort could recover from errors.  Quite
 497                          * possibly the HA just disappeared.
 498                          */
 499                         SAS_DPRINTK("error from  device %llx, LUN %x "
 500                                     "couldn't be recovered in any way\n",
 501                                     SAS_ADDR(task->dev->sas_addr),
 502                                     cmd->device->lun);
 503
 504                         task->task_done(task);
 505                         goto clear_q;
 506                 }
 507         }
 508 out:
 509         scsi_eh_flush_done_q(&ha->eh_done_q);
 510         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 511         return;
 512 clear_q:
 513         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 514         list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
 515                 struct sas_task *task = TO_SAS_TASK(cmd);
 516                 list_del_init(&cmd->eh_entry);
 517                 task->task_done(task);
 518         }
 519 }
 520
 521 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 522 {
 523         struct sas_task *task = TO_SAS_TASK(cmd);
 524         unsigned long flags;
 525
 526         if (!task) {
 527                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: EH_HANDLED\n",
 528                             cmd, task);
 529                 return EH_HANDLED;
 530         }
 531
 532         spin_lock_irqsave(&task->task_state_lock, flags);
 533         if (task->task_state_flags & SAS_TASK_INITIATOR_ABORTED) {
 534                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 535                 SAS_DPRINTK("command 0x%p, task 0x%p, aborted by initiator: "
 536                             "EH_NOT_HANDLED\n", cmd, task);
 537                 return EH_NOT_HANDLED;
 538         }
 539         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 540                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 541                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 542                             cmd, task);
 543                 return EH_HANDLED;
 544         }
 545         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 546         spin_unlock_irqrestore(&task->task_state_lock, flags);
 547
 548         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 549                     cmd, task);
 550
 551         return EH_NOT_HANDLED;
 552 }
 553
 554 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 555 {
 556         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 557         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 558         struct domain_device *found_dev = NULL;
 559         int i;
 560
 561         spin_lock(&ha->phy_port_lock);
 562         for (i = 0; i < ha->num_phys; i++) {
 563                 struct asd_sas_port *port = ha->sas_port[i];
 564                 struct domain_device *dev;
 565
 566                 spin_lock(&port->dev_list_lock);
 567                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 568                         if (rphy == dev->rphy) {
 569                                 found_dev = dev;
 570                                 spin_unlock(&port->dev_list_lock);
 571                                 goto found;
 572                         }
 573                 }
 574                 spin_unlock(&port->dev_list_lock);
 575         }
 576  found:
 577         spin_unlock(&ha->phy_port_lock);
 578
 579         return found_dev;
 580 }
 581
 582 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 583 {
 584         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 585
 586         return sas_find_dev_by_rphy(rphy);
 587 }
 588
 589 int sas_target_alloc(struct scsi_target *starget)
 590 {
 591         struct domain_device *found_dev = sas_find_target(starget);
 592
 593         if (!found_dev)
 594                 return -ENODEV;
 595
 596         starget->hostdata = found_dev;
 597         return 0;
 598 }
 599
 600 #define SAS_DEF_QD 32
 601 #define SAS_MAX_QD 64
 602
 603 int sas_slave_configure(struct scsi_device *scsi_dev)
 604 {
 605         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 606         struct sas_ha_struct *sas_ha;
 607
 608         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 609
 610         sas_ha = dev->port->ha;
 611
 612         sas_read_port_mode_page(scsi_dev);
 613
 614         if (scsi_dev->tagged_supported) {
 615                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 616                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 617         } else {
 618                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 619                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 620                             scsi_dev->lun);
 621                 scsi_dev->tagged_supported = 0;
 622                 scsi_set_tag_type(scsi_dev, 0);
 623                 scsi_deactivate_tcq(scsi_dev, 1);
 624         }
 625
 626         return 0;
 627 }
 628
 629 void sas_slave_destroy(struct scsi_device *scsi_dev)
 630 {
 631 }
 632
 633 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
 634 {
 635         int res = min(new_depth, SAS_MAX_QD);
 636
 637         if (scsi_dev->tagged_supported)
 638                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 639                                         res);
 640         else {
 641                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 642                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 643                            SAS_ADDR(dev->sas_addr),
 644                            scsi_dev->lun);
 645                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 646                 res = 1;
 647         }
 648
 649         return res;
 650 }
 651
 652 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 653 {
 654         if (!scsi_dev->tagged_supported)
 655                 return 0;
 656
 657         scsi_deactivate_tcq(scsi_dev, 1);
 658
 659         scsi_set_tag_type(scsi_dev, qt);
 660         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 661
 662         return qt;
 663 }
 664
 665 int sas_bios_param(struct scsi_device *scsi_dev,
 666                           struct block_device *bdev,
 667                           sector_t capacity, int *hsc)
 668 {
 669         hsc[0] = 255;
 670         hsc[1] = 63;
 671         sector_div(capacity, 255*63);
 672         hsc[2] = capacity;
 673
 674         return 0;
 675 }
 676
 677 /* ---------- Task Collector Thread implementation ---------- */
 678
 679 static void sas_queue(struct sas_ha_struct *sas_ha)
 680 {
 681         struct scsi_core *core = &sas_ha->core;
 682         unsigned long flags;
 683         LIST_HEAD(q);
 684         int can_queue;
 685         int res;
 686         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 687
 688         spin_lock_irqsave(&core->task_queue_lock, flags);
 689         while (!core->queue_thread_kill &&
 690                !list_empty(&core->task_queue)) {
 691
 692                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 693                 if (can_queue >= 0) {
 694                         can_queue = core->task_queue_size;
 695                         list_splice_init(&core->task_queue, &q);
 696                 } else {
 697                         struct list_head *a, *n;
 698
 699                         can_queue = sas_ha->lldd_queue_size;
 700                         list_for_each_safe(a, n, &core->task_queue) {
 701                                 list_move_tail(a, &q);
 702                                 if (--can_queue == 0)
 703                                         break;
 704                         }
 705                         can_queue = sas_ha->lldd_queue_size;
 706                 }
 707                 core->task_queue_size -= can_queue;
 708                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 709                 {
 710                         struct sas_task *task = list_entry(q.next,
 711                                                            struct sas_task,
 712                                                            list);
 713                         list_del_init(&q);
 714                         res = i->dft->lldd_execute_task(task, can_queue,
 715                                                         GFP_KERNEL);
 716                         if (unlikely(res))
 717                                 __list_add(&q, task->list.prev, &task->list);
 718                 }
 719                 spin_lock_irqsave(&core->task_queue_lock, flags);
 720                 if (res) {
 721                         list_splice_init(&q, &core->task_queue); /*at head*/
 722                         core->task_queue_size += can_queue;
 723                 }
 724         }
 725         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 726 }
 727
 728 static DECLARE_COMPLETION(queue_th_comp);
 729
 730 /**
 731  * sas_queue_thread -- The Task Collector thread
 732  * @_sas_ha: pointer to struct sas_ha
 733  */
 734 static int sas_queue_thread(void *_sas_ha)
 735 {
 736         struct sas_ha_struct *sas_ha = _sas_ha;
 737         struct scsi_core *core = &sas_ha->core;
 738
 739         daemonize("sas_queue_%d", core->shost->host_no);
 740         current->flags |= PF_NOFREEZE;
 741
 742         complete(&queue_th_comp);
 743
 744         while (1) {
 745                 down_interruptible(&core->queue_thread_sema);
 746                 sas_queue(sas_ha);
 747                 if (core->queue_thread_kill)
 748                         break;
 749         }
 750
 751         complete(&queue_th_comp);
 752
 753         return 0;
 754 }
 755
 756 int sas_init_queue(struct sas_ha_struct *sas_ha)
 757 {
 758         int res;
 759         struct scsi_core *core = &sas_ha->core;
 760
 761         spin_lock_init(&core->task_queue_lock);
 762         core->task_queue_size = 0;
 763         INIT_LIST_HEAD(&core->task_queue);
 764         init_MUTEX_LOCKED(&core->queue_thread_sema);
 765
 766         res = kernel_thread(sas_queue_thread, sas_ha, 0);
 767         if (res >= 0)
 768                 wait_for_completion(&queue_th_comp);
 769
 770         return res < 0 ? res : 0;
 771 }
 772
 773 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 774 {
 775         unsigned long flags;
 776         struct scsi_core *core = &sas_ha->core;
 777         struct sas_task *task, *n;
 778
 779         init_completion(&queue_th_comp);
 780         core->queue_thread_kill = 1;
 781         up(&core->queue_thread_sema);
 782         wait_for_completion(&queue_th_comp);
 783
 784         if (!list_empty(&core->task_queue))
 785                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 786                             SAS_ADDR(sas_ha->sas_addr));
 787
 788         spin_lock_irqsave(&core->task_queue_lock, flags);
 789         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 790                 struct scsi_cmnd *cmd = task->uldd_task;
 791
 792                 list_del_init(&task->list);
 793
 794                 ASSIGN_SAS_TASK(cmd, NULL);
 795                 sas_free_task(task);
 796                 cmd->result = DID_ABORT << 16;
 797                 cmd->scsi_done(cmd);
 798         }
 799         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 800 }
 801
 802 static int do_sas_task_abort(struct sas_task *task)
 803 {
 804         struct scsi_cmnd *sc = task->uldd_task;
 805         struct sas_internal *si =
 806                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 807         unsigned long flags;
 808         int res;
 809
 810         spin_lock_irqsave(&task->task_state_lock, flags);
 811         if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 812                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 813                 SAS_DPRINTK("%s: Task %p already aborted.\n", __FUNCTION__,
 814                             task);
 815                 return 0;
 816         }
 817
 818         task->task_state_flags |= SAS_TASK_INITIATOR_ABORTED;
 819         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 820                 task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 821         spin_unlock_irqrestore(&task->task_state_lock, flags);
 822
 823         if (!si->dft->lldd_abort_task)
 824                 return -ENODEV;
 825
 826         res = si->dft->lldd_abort_task(task);
 827         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
 828             (res == TMF_RESP_FUNC_COMPLETE))
 829         {
 830                 /* SMP commands don't have scsi_cmds(?) */
 831                 if (!sc) {
 832                         task->task_done(task);
 833                         return 0;
 834                 }
 835                 scsi_req_abort_cmd(sc);
 836                 scsi_schedule_eh(sc->device->host);
 837                 return 0;
 838         }
 839
 840         spin_lock_irqsave(&task->task_state_lock, flags);
 841         task->task_state_flags &= ~SAS_TASK_INITIATOR_ABORTED;
 842         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 843                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 844         spin_unlock_irqrestore(&task->task_state_lock, flags);
 845
 846         return -EAGAIN;
 847 }
 848
 849 void sas_task_abort(struct sas_task *task)
 850 {
 851         int i;
 852
 853         for (i = 0; i < 5; i++)
 854                 if (!do_sas_task_abort(task))
 855                         return;
 856
 857         SAS_DPRINTK("%s: Could not kill task!\n", __FUNCTION__);
 858 }
 859
 860 EXPORT_SYMBOL_GPL(sas_queuecommand);
 861 EXPORT_SYMBOL_GPL(sas_target_alloc);
 862 EXPORT_SYMBOL_GPL(sas_slave_configure);
 863 EXPORT_SYMBOL_GPL(sas_slave_destroy);
 864 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
 865 EXPORT_SYMBOL_GPL(sas_change_queue_type);
 866 EXPORT_SYMBOL_GPL(sas_bios_param);
 867 EXPORT_SYMBOL_GPL(sas_task_abort);