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         for (i = 0; i < 5; i++) {
 314                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 315                 res = si->dft->lldd_abort_task(task);
 316
 317                 spin_lock_irqsave(&task->task_state_lock, flags);
 318                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 319                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 320                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 321                                     task);
 322                         return TASK_IS_DONE;
 323                 }
 324                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 325
 326                 if (res == TMF_RESP_FUNC_COMPLETE) {
 327                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 328                                     __FUNCTION__, task);
 329                         return TASK_IS_ABORTED;
 330                 } else if (si->dft->lldd_query_task) {
 331                         SAS_DPRINTK("%s: querying task 0x%p\n",
 332                                     __FUNCTION__, task);
 333                         res = si->dft->lldd_query_task(task);
 334                         if (res == TMF_RESP_FUNC_SUCC) {
 335                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 336                                             __FUNCTION__, task);
 337                                 return TASK_IS_AT_LU;
 338                         } else if (res == TMF_RESP_FUNC_COMPLETE) {
 339                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 340                                             __FUNCTION__, task);
 341                                 return TASK_IS_NOT_AT_LU;
 342                         }
 343                 }
 344         }
 345         return res;
 346 }
 347
 348 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 349 {
 350         int res = TMF_RESP_FUNC_FAILED;
 351         struct scsi_lun lun;
 352         struct sas_internal *i =
 353                 to_sas_internal(dev->port->ha->core.shost->transportt);
 354
 355         int_to_scsilun(cmd->device->lun, &lun);
 356
 357         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 358                     SAS_ADDR(dev->sas_addr),
 359                     cmd->device->lun);
 360
 361         if (i->dft->lldd_abort_task_set)
 362                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 363
 364         if (res == TMF_RESP_FUNC_FAILED) {
 365                 if (i->dft->lldd_clear_task_set)
 366                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 367         }
 368
 369         if (res == TMF_RESP_FUNC_FAILED) {
 370                 if (i->dft->lldd_lu_reset)
 371                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 372         }
 373
 374         return res;
 375 }
 376
 377 static int sas_recover_I_T(struct domain_device *dev)
 378 {
 379         int res = TMF_RESP_FUNC_FAILED;
 380         struct sas_internal *i =
 381                 to_sas_internal(dev->port->ha->core.shost->transportt);
 382
 383         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 384                     SAS_ADDR(dev->sas_addr));
 385
 386         if (i->dft->lldd_I_T_nexus_reset)
 387                 res = i->dft->lldd_I_T_nexus_reset(dev);
 388
 389         return res;
 390 }
 391
 392 static int eh_reset_phy_helper(struct sas_phy *phy)
 393 {
 394         int tmf_resp;
 395
 396         tmf_resp = sas_phy_reset(phy, 1);
 397         if (tmf_resp)
 398                 SAS_DPRINTK("Hard reset of phy %d failed 0x%x\n",
 399                             phy->identify.phy_identifier,
 400                             tmf_resp);
 401
 402         return tmf_resp;
 403 }
 404
 405 void sas_scsi_recover_host(struct Scsi_Host *shost)
 406 {
 407         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 408         unsigned long flags;
 409         LIST_HEAD(error_q);
 410         struct scsi_cmnd *cmd, *n;
 411         enum task_disposition res = TASK_IS_DONE;
 412         int tmf_resp, need_reset;
 413         struct sas_internal *i = to_sas_internal(shost->transportt);
 414         struct sas_phy *task_sas_phy = NULL;
 415
 416         spin_lock_irqsave(shost->host_lock, flags);
 417         list_splice_init(&shost->eh_cmd_q, &error_q);
 418         spin_unlock_irqrestore(shost->host_lock, flags);
 419
 420         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 421
 422         /* All tasks on this list were marked SAS_TASK_STATE_ABORTED
 423          * by sas_scsi_timed_out() callback.
 424          */
 425 Again:
 426         SAS_DPRINTK("going over list...\n");
 427         list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
 428                 struct sas_task *task = TO_SAS_TASK(cmd);
 429                 list_del_init(&cmd->eh_entry);
 430
 431                 if (!task) {
 432                         SAS_DPRINTK("%s: taskless cmd?!\n", __FUNCTION__);
 433                         continue;
 434                 }
 435
 436                 spin_lock_irqsave(&task->task_state_lock, flags);
 437                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 438                 if (need_reset)
 439                         task_sas_phy = task->dev->port->phy;
 440                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 441
 442                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 443                 res = sas_scsi_find_task(task);
 444
 445                 cmd->eh_eflags = 0;
 446
 447                 switch (res) {
 448                 case TASK_IS_DONE:
 449                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 450                                     task);
 451                         task->task_done(task);
 452                         if (need_reset)
 453                                 eh_reset_phy_helper(task_sas_phy);
 454                         continue;
 455                 case TASK_IS_ABORTED:
 456                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 457                                     __FUNCTION__, task);
 458                         task->task_done(task);
 459                         if (need_reset)
 460                                 eh_reset_phy_helper(task_sas_phy);
 461                         continue;
 462                 case TASK_IS_AT_LU:
 463                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 464                         tmf_resp = sas_recover_lu(task->dev, cmd);
 465                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 466                                 SAS_DPRINTK("dev %016llx LU %x is "
 467                                             "recovered\n",
 468                                             SAS_ADDR(task->dev),
 469                                             cmd->device->lun);
 470                                 task->task_done(task);
 471                                 if (need_reset)
 472                                         eh_reset_phy_helper(task_sas_phy);
 473                                 sas_scsi_clear_queue_lu(&error_q, cmd);
 474                                 goto Again;
 475                         }
 476                         /* fallthrough */
 477                 case TASK_IS_NOT_AT_LU:
 478                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 479                                     task);
 480                         tmf_resp = sas_recover_I_T(task->dev);
 481                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 482                                 SAS_DPRINTK("I_T %016llx recovered\n",
 483                                             SAS_ADDR(task->dev->sas_addr));
 484                                 task->task_done(task);
 485                                 if (need_reset)
 486                                         eh_reset_phy_helper(task_sas_phy);
 487                                 sas_scsi_clear_queue_I_T(&error_q, task->dev);
 488                                 goto Again;
 489                         }
 490                         /* Hammer time :-) */
 491                         if (i->dft->lldd_clear_nexus_port) {
 492                                 struct asd_sas_port *port = task->dev->port;
 493                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 494                                             port->id);
 495                                 res = i->dft->lldd_clear_nexus_port(port);
 496                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 497                                         SAS_DPRINTK("clear nexus port:%d "
 498                                                     "succeeded\n", port->id);
 499                                         task->task_done(task);
 500                                         if (need_reset)
 501                                                 eh_reset_phy_helper(task_sas_phy);
 502                                         sas_scsi_clear_queue_port(&error_q,
 503                                                                   port);
 504                                         goto Again;
 505                                 }
 506                         }
 507                         if (i->dft->lldd_clear_nexus_ha) {
 508                                 SAS_DPRINTK("clear nexus ha\n");
 509                                 res = i->dft->lldd_clear_nexus_ha(ha);
 510                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 511                                         SAS_DPRINTK("clear nexus ha "
 512                                                     "succeeded\n");
 513                                         task->task_done(task);
 514                                         if (need_reset)
 515                                                 eh_reset_phy_helper(task_sas_phy);
 516                                         goto out;
 517                                 }
 518                         }
 519                         /* If we are here -- this means that no amount
 520                          * of effort could recover from errors.  Quite
 521                          * possibly the HA just disappeared.
 522                          */
 523                         SAS_DPRINTK("error from  device %llx, LUN %x "
 524                                     "couldn't be recovered in any way\n",
 525                                     SAS_ADDR(task->dev->sas_addr),
 526                                     cmd->device->lun);
 527
 528                         task->task_done(task);
 529                         if (need_reset)
 530                                 eh_reset_phy_helper(task_sas_phy);
 531                         goto clear_q;
 532                 }
 533         }
 534 out:
 535         scsi_eh_flush_done_q(&ha->eh_done_q);
 536         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 537         return;
 538 clear_q:
 539         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 540         list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
 541                 struct sas_task *task = TO_SAS_TASK(cmd);
 542                 list_del_init(&cmd->eh_entry);
 543                 task->task_done(task);
 544         }
 545 }
 546
 547 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 548 {
 549         struct sas_task *task = TO_SAS_TASK(cmd);
 550         unsigned long flags;
 551
 552         if (!task) {
 553                 cmd->timeout_per_command /= 2;
 554                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 555                             cmd, task, (cmd->timeout_per_command ?
 556                             "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
 557                 if (!cmd->timeout_per_command)
 558                         return EH_NOT_HANDLED;
 559                 return EH_RESET_TIMER;
 560         }
 561
 562         spin_lock_irqsave(&task->task_state_lock, flags);
 563         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 564         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 565                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 566                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 567                             cmd, task);
 568                 return EH_HANDLED;
 569         }
 570         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 571                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 572                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 573                             "EH_RESET_TIMER\n",
 574                             cmd, task);
 575                 return EH_RESET_TIMER;
 576         }
 577         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 578         spin_unlock_irqrestore(&task->task_state_lock, flags);
 579
 580         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 581                     cmd, task);
 582
 583         return EH_NOT_HANDLED;
 584 }
 585
 586 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 587 {
 588         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 589         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 590         struct domain_device *found_dev = NULL;
 591         int i;
 592
 593         spin_lock(&ha->phy_port_lock);
 594         for (i = 0; i < ha->num_phys; i++) {
 595                 struct asd_sas_port *port = ha->sas_port[i];
 596                 struct domain_device *dev;
 597
 598                 spin_lock(&port->dev_list_lock);
 599                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 600                         if (rphy == dev->rphy) {
 601                                 found_dev = dev;
 602                                 spin_unlock(&port->dev_list_lock);
 603                                 goto found;
 604                         }
 605                 }
 606                 spin_unlock(&port->dev_list_lock);
 607         }
 608  found:
 609         spin_unlock(&ha->phy_port_lock);
 610
 611         return found_dev;
 612 }
 613
 614 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 615 {
 616         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 617
 618         return sas_find_dev_by_rphy(rphy);
 619 }
 620
 621 int sas_target_alloc(struct scsi_target *starget)
 622 {
 623         struct domain_device *found_dev = sas_find_target(starget);
 624
 625         if (!found_dev)
 626                 return -ENODEV;
 627
 628         starget->hostdata = found_dev;
 629         return 0;
 630 }
 631
 632 #define SAS_DEF_QD 32
 633 #define SAS_MAX_QD 64
 634
 635 int sas_slave_configure(struct scsi_device *scsi_dev)
 636 {
 637         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 638         struct sas_ha_struct *sas_ha;
 639
 640         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 641
 642         sas_ha = dev->port->ha;
 643
 644         sas_read_port_mode_page(scsi_dev);
 645
 646         if (scsi_dev->tagged_supported) {
 647                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 648                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 649         } else {
 650                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 651                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 652                             scsi_dev->lun);
 653                 scsi_dev->tagged_supported = 0;
 654                 scsi_set_tag_type(scsi_dev, 0);
 655                 scsi_deactivate_tcq(scsi_dev, 1);
 656         }
 657
 658         return 0;
 659 }
 660
 661 void sas_slave_destroy(struct scsi_device *scsi_dev)
 662 {
 663 }
 664
 665 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
 666 {
 667         int res = min(new_depth, SAS_MAX_QD);
 668
 669         if (scsi_dev->tagged_supported)
 670                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 671                                         res);
 672         else {
 673                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 674                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 675                            SAS_ADDR(dev->sas_addr),
 676                            scsi_dev->lun);
 677                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 678                 res = 1;
 679         }
 680
 681         return res;
 682 }
 683
 684 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 685 {
 686         if (!scsi_dev->tagged_supported)
 687                 return 0;
 688
 689         scsi_deactivate_tcq(scsi_dev, 1);
 690
 691         scsi_set_tag_type(scsi_dev, qt);
 692         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 693
 694         return qt;
 695 }
 696
 697 int sas_bios_param(struct scsi_device *scsi_dev,
 698                           struct block_device *bdev,
 699                           sector_t capacity, int *hsc)
 700 {
 701         hsc[0] = 255;
 702         hsc[1] = 63;
 703         sector_div(capacity, 255*63);
 704         hsc[2] = capacity;
 705
 706         return 0;
 707 }
 708
 709 /* ---------- Task Collector Thread implementation ---------- */
 710
 711 static void sas_queue(struct sas_ha_struct *sas_ha)
 712 {
 713         struct scsi_core *core = &sas_ha->core;
 714         unsigned long flags;
 715         LIST_HEAD(q);
 716         int can_queue;
 717         int res;
 718         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 719
 720         spin_lock_irqsave(&core->task_queue_lock, flags);
 721         while (!core->queue_thread_kill &&
 722                !list_empty(&core->task_queue)) {
 723
 724                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 725                 if (can_queue >= 0) {
 726                         can_queue = core->task_queue_size;
 727                         list_splice_init(&core->task_queue, &q);
 728                 } else {
 729                         struct list_head *a, *n;
 730
 731                         can_queue = sas_ha->lldd_queue_size;
 732                         list_for_each_safe(a, n, &core->task_queue) {
 733                                 list_move_tail(a, &q);
 734                                 if (--can_queue == 0)
 735                                         break;
 736                         }
 737                         can_queue = sas_ha->lldd_queue_size;
 738                 }
 739                 core->task_queue_size -= can_queue;
 740                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 741                 {
 742                         struct sas_task *task = list_entry(q.next,
 743                                                            struct sas_task,
 744                                                            list);
 745                         list_del_init(&q);
 746                         res = i->dft->lldd_execute_task(task, can_queue,
 747                                                         GFP_KERNEL);
 748                         if (unlikely(res))
 749                                 __list_add(&q, task->list.prev, &task->list);
 750                 }
 751                 spin_lock_irqsave(&core->task_queue_lock, flags);
 752                 if (res) {
 753                         list_splice_init(&q, &core->task_queue); /*at head*/
 754                         core->task_queue_size += can_queue;
 755                 }
 756         }
 757         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 758 }
 759
 760 static DECLARE_COMPLETION(queue_th_comp);
 761
 762 /**
 763  * sas_queue_thread -- The Task Collector thread
 764  * @_sas_ha: pointer to struct sas_ha
 765  */
 766 static int sas_queue_thread(void *_sas_ha)
 767 {
 768         struct sas_ha_struct *sas_ha = _sas_ha;
 769         struct scsi_core *core = &sas_ha->core;
 770
 771         daemonize("sas_queue_%d", core->shost->host_no);
 772         current->flags |= PF_NOFREEZE;
 773
 774         complete(&queue_th_comp);
 775
 776         while (1) {
 777                 down_interruptible(&core->queue_thread_sema);
 778                 sas_queue(sas_ha);
 779                 if (core->queue_thread_kill)
 780                         break;
 781         }
 782
 783         complete(&queue_th_comp);
 784
 785         return 0;
 786 }
 787
 788 int sas_init_queue(struct sas_ha_struct *sas_ha)
 789 {
 790         int res;
 791         struct scsi_core *core = &sas_ha->core;
 792
 793         spin_lock_init(&core->task_queue_lock);
 794         core->task_queue_size = 0;
 795         INIT_LIST_HEAD(&core->task_queue);
 796         init_MUTEX_LOCKED(&core->queue_thread_sema);
 797
 798         res = kernel_thread(sas_queue_thread, sas_ha, 0);
 799         if (res >= 0)
 800                 wait_for_completion(&queue_th_comp);
 801
 802         return res < 0 ? res : 0;
 803 }
 804
 805 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 806 {
 807         unsigned long flags;
 808         struct scsi_core *core = &sas_ha->core;
 809         struct sas_task *task, *n;
 810
 811         init_completion(&queue_th_comp);
 812         core->queue_thread_kill = 1;
 813         up(&core->queue_thread_sema);
 814         wait_for_completion(&queue_th_comp);
 815
 816         if (!list_empty(&core->task_queue))
 817                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 818                             SAS_ADDR(sas_ha->sas_addr));
 819
 820         spin_lock_irqsave(&core->task_queue_lock, flags);
 821         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 822                 struct scsi_cmnd *cmd = task->uldd_task;
 823
 824                 list_del_init(&task->list);
 825
 826                 ASSIGN_SAS_TASK(cmd, NULL);
 827                 sas_free_task(task);
 828                 cmd->result = DID_ABORT << 16;
 829                 cmd->scsi_done(cmd);
 830         }
 831         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 832 }
 833
 834 /*
 835  * Call the LLDD task abort routine directly.  This function is intended for
 836  * use by upper layers that need to tell the LLDD to abort a task.
 837  */
 838 int __sas_task_abort(struct sas_task *task)
 839 {
 840         struct sas_internal *si =
 841                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 842         unsigned long flags;
 843         int res;
 844
 845         spin_lock_irqsave(&task->task_state_lock, flags);
 846         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 847             task->task_state_flags & SAS_TASK_STATE_DONE) {
 848                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 849                 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
 850                             task);
 851                 return 0;
 852         }
 853         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 854         spin_unlock_irqrestore(&task->task_state_lock, flags);
 855
 856         if (!si->dft->lldd_abort_task)
 857                 return -ENODEV;
 858
 859         res = si->dft->lldd_abort_task(task);
 860
 861         spin_lock_irqsave(&task->task_state_lock, flags);
 862         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
 863             (res == TMF_RESP_FUNC_COMPLETE))
 864         {
 865                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 866                 task->task_done(task);
 867                 return 0;
 868         }
 869
 870         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 871                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 872         spin_unlock_irqrestore(&task->task_state_lock, flags);
 873
 874         return -EAGAIN;
 875 }
 876
 877 /*
 878  * Tell an upper layer that it needs to initiate an abort for a given task.
 879  * This should only ever be called by an LLDD.
 880  */
 881 void sas_task_abort(struct sas_task *task)
 882 {
 883         struct scsi_cmnd *sc = task->uldd_task;
 884
 885         /* Escape for libsas internal commands */
 886         if (!sc) {
 887                 if (!del_timer(&task->timer))
 888                         return;
 889                 task->timer.function(task->timer.data);
 890                 return;
 891         }
 892
 893         scsi_req_abort_cmd(sc);
 894         scsi_schedule_eh(sc->device->host);
 895 }
 896
 897 EXPORT_SYMBOL_GPL(sas_queuecommand);
 898 EXPORT_SYMBOL_GPL(sas_target_alloc);
 899 EXPORT_SYMBOL_GPL(sas_slave_configure);
 900 EXPORT_SYMBOL_GPL(sas_slave_destroy);
 901 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
 902 EXPORT_SYMBOL_GPL(sas_change_queue_type);
 903 EXPORT_SYMBOL_GPL(sas_bios_param);
 904 EXPORT_SYMBOL_GPL(__sas_task_abort);
 905 EXPORT_SYMBOL_GPL(sas_task_abort);
 906 EXPORT_SYMBOL_GPL(sas_phy_reset);
 907 EXPORT_SYMBOL_GPL(sas_phy_enable);