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