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         TASK_ABORT_FAILED,
 285 };
 286
 287 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 288 {
 289         struct sas_ha_struct *ha = task->dev->port->ha;
 290         unsigned long flags;
 291         int i, res;
 292         struct sas_internal *si =
 293                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 294
 295         if (ha->lldd_max_execute_num > 1) {
 296                 struct scsi_core *core = &ha->core;
 297                 struct sas_task *t, *n;
 298
 299                 spin_lock_irqsave(&core->task_queue_lock, flags);
 300                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 301                         if (task == t) {
 302                                 list_del_init(&t->list);
 303                                 spin_unlock_irqrestore(&core->task_queue_lock,
 304                                                        flags);
 305                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 306                                             "task_queue\n",
 307                                             __FUNCTION__, task);
 308                                 return TASK_IS_ABORTED;
 309                         }
 310                 }
 311                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 312         }
 313
 314         for (i = 0; i < 5; i++) {
 315                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 316                 res = si->dft->lldd_abort_task(task);
 317
 318                 spin_lock_irqsave(&task->task_state_lock, flags);
 319                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 320                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 321                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 322                                     task);
 323                         return TASK_IS_DONE;
 324                 }
 325                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 326
 327                 if (res == TMF_RESP_FUNC_COMPLETE) {
 328                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 329                                     __FUNCTION__, task);
 330                         return TASK_IS_ABORTED;
 331                 } else if (si->dft->lldd_query_task) {
 332                         SAS_DPRINTK("%s: querying task 0x%p\n",
 333                                     __FUNCTION__, task);
 334                         res = si->dft->lldd_query_task(task);
 335                         switch (res) {
 336                         case TMF_RESP_FUNC_SUCC:
 337                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 338                                             __FUNCTION__, task);
 339                                 return TASK_IS_AT_LU;
 340                         case TMF_RESP_FUNC_COMPLETE:
 341                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 342                                             __FUNCTION__, task);
 343                                 return TASK_IS_NOT_AT_LU;
 344                         case TMF_RESP_FUNC_FAILED:
 345                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 346                                                 __FUNCTION__, task);
 347                                 return TASK_ABORT_FAILED;
 348                         }
 349
 350                 }
 351         }
 352         return res;
 353 }
 354
 355 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 356 {
 357         int res = TMF_RESP_FUNC_FAILED;
 358         struct scsi_lun lun;
 359         struct sas_internal *i =
 360                 to_sas_internal(dev->port->ha->core.shost->transportt);
 361
 362         int_to_scsilun(cmd->device->lun, &lun);
 363
 364         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 365                     SAS_ADDR(dev->sas_addr),
 366                     cmd->device->lun);
 367
 368         if (i->dft->lldd_abort_task_set)
 369                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 370
 371         if (res == TMF_RESP_FUNC_FAILED) {
 372                 if (i->dft->lldd_clear_task_set)
 373                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 374         }
 375
 376         if (res == TMF_RESP_FUNC_FAILED) {
 377                 if (i->dft->lldd_lu_reset)
 378                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 379         }
 380
 381         return res;
 382 }
 383
 384 static int sas_recover_I_T(struct domain_device *dev)
 385 {
 386         int res = TMF_RESP_FUNC_FAILED;
 387         struct sas_internal *i =
 388                 to_sas_internal(dev->port->ha->core.shost->transportt);
 389
 390         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 391                     SAS_ADDR(dev->sas_addr));
 392
 393         if (i->dft->lldd_I_T_nexus_reset)
 394                 res = i->dft->lldd_I_T_nexus_reset(dev);
 395
 396         return res;
 397 }
 398
 399 static int eh_reset_phy_helper(struct sas_phy *phy)
 400 {
 401         int tmf_resp;
 402
 403         tmf_resp = sas_phy_reset(phy, 1);
 404         if (tmf_resp)
 405                 SAS_DPRINTK("Hard reset of phy %d failed 0x%x\n",
 406                             phy->identify.phy_identifier,
 407                             tmf_resp);
 408
 409         return tmf_resp;
 410 }
 411
 412 void sas_scsi_recover_host(struct Scsi_Host *shost)
 413 {
 414         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 415         unsigned long flags;
 416         LIST_HEAD(error_q);
 417         struct scsi_cmnd *cmd, *n;
 418         enum task_disposition res = TASK_IS_DONE;
 419         int tmf_resp, need_reset;
 420         struct sas_internal *i = to_sas_internal(shost->transportt);
 421         struct sas_phy *task_sas_phy = NULL;
 422
 423         spin_lock_irqsave(shost->host_lock, flags);
 424         list_splice_init(&shost->eh_cmd_q, &error_q);
 425         spin_unlock_irqrestore(shost->host_lock, flags);
 426
 427         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 428
 429         /* All tasks on this list were marked SAS_TASK_STATE_ABORTED
 430          * by sas_scsi_timed_out() callback.
 431          */
 432 Again:
 433         SAS_DPRINTK("going over list...\n");
 434         list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
 435                 struct sas_task *task = TO_SAS_TASK(cmd);
 436                 list_del_init(&cmd->eh_entry);
 437
 438                 if (!task) {
 439                         SAS_DPRINTK("%s: taskless cmd?!\n", __FUNCTION__);
 440                         continue;
 441                 }
 442
 443                 spin_lock_irqsave(&task->task_state_lock, flags);
 444                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 445                 if (need_reset)
 446                         task_sas_phy = task->dev->port->phy;
 447                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 448
 449                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 450                 res = sas_scsi_find_task(task);
 451
 452                 cmd->eh_eflags = 0;
 453
 454                 switch (res) {
 455                 case TASK_IS_DONE:
 456                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 457                                     task);
 458                         task->task_done(task);
 459                         if (need_reset)
 460                                 eh_reset_phy_helper(task_sas_phy);
 461                         continue;
 462                 case TASK_IS_ABORTED:
 463                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 464                                     __FUNCTION__, task);
 465                         task->task_done(task);
 466                         if (need_reset)
 467                                 eh_reset_phy_helper(task_sas_phy);
 468                         continue;
 469                 case TASK_IS_AT_LU:
 470                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 471                         tmf_resp = sas_recover_lu(task->dev, cmd);
 472                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 473                                 SAS_DPRINTK("dev %016llx LU %x is "
 474                                             "recovered\n",
 475                                             SAS_ADDR(task->dev),
 476                                             cmd->device->lun);
 477                                 task->task_done(task);
 478                                 if (need_reset)
 479                                         eh_reset_phy_helper(task_sas_phy);
 480                                 sas_scsi_clear_queue_lu(&error_q, cmd);
 481                                 goto Again;
 482                         }
 483                         /* fallthrough */
 484                 case TASK_IS_NOT_AT_LU:
 485                 case TASK_ABORT_FAILED:
 486                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 487                                     task);
 488                         tmf_resp = sas_recover_I_T(task->dev);
 489                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 490                                 SAS_DPRINTK("I_T %016llx recovered\n",
 491                                             SAS_ADDR(task->dev->sas_addr));
 492                                 task->task_done(task);
 493                                 if (need_reset)
 494                                         eh_reset_phy_helper(task_sas_phy);
 495                                 sas_scsi_clear_queue_I_T(&error_q, task->dev);
 496                                 goto Again;
 497                         }
 498                         /* Hammer time :-) */
 499                         if (i->dft->lldd_clear_nexus_port) {
 500                                 struct asd_sas_port *port = task->dev->port;
 501                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 502                                             port->id);
 503                                 res = i->dft->lldd_clear_nexus_port(port);
 504                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 505                                         SAS_DPRINTK("clear nexus port:%d "
 506                                                     "succeeded\n", port->id);
 507                                         task->task_done(task);
 508                                         if (need_reset)
 509                                                 eh_reset_phy_helper(task_sas_phy);
 510                                         sas_scsi_clear_queue_port(&error_q,
 511                                                                   port);
 512                                         goto Again;
 513                                 }
 514                         }
 515                         if (i->dft->lldd_clear_nexus_ha) {
 516                                 SAS_DPRINTK("clear nexus ha\n");
 517                                 res = i->dft->lldd_clear_nexus_ha(ha);
 518                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 519                                         SAS_DPRINTK("clear nexus ha "
 520                                                     "succeeded\n");
 521                                         task->task_done(task);
 522                                         if (need_reset)
 523                                                 eh_reset_phy_helper(task_sas_phy);
 524                                         goto out;
 525                                 }
 526                         }
 527                         /* If we are here -- this means that no amount
 528                          * of effort could recover from errors.  Quite
 529                          * possibly the HA just disappeared.
 530                          */
 531                         SAS_DPRINTK("error from  device %llx, LUN %x "
 532                                     "couldn't be recovered in any way\n",
 533                                     SAS_ADDR(task->dev->sas_addr),
 534                                     cmd->device->lun);
 535
 536                         task->task_done(task);
 537                         if (need_reset)
 538                                 eh_reset_phy_helper(task_sas_phy);
 539                         goto clear_q;
 540                 }
 541         }
 542 out:
 543         scsi_eh_flush_done_q(&ha->eh_done_q);
 544         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 545         return;
 546 clear_q:
 547         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 548         list_for_each_entry_safe(cmd, n, &error_q, eh_entry) {
 549                 struct sas_task *task = TO_SAS_TASK(cmd);
 550                 list_del_init(&cmd->eh_entry);
 551                 task->task_done(task);
 552         }
 553 }
 554
 555 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 556 {
 557         struct sas_task *task = TO_SAS_TASK(cmd);
 558         unsigned long flags;
 559
 560         if (!task) {
 561                 cmd->timeout_per_command /= 2;
 562                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 563                             cmd, task, (cmd->timeout_per_command ?
 564                             "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
 565                 if (!cmd->timeout_per_command)
 566                         return EH_NOT_HANDLED;
 567                 return EH_RESET_TIMER;
 568         }
 569
 570         spin_lock_irqsave(&task->task_state_lock, flags);
 571         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 572         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 573                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 574                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 575                             cmd, task);
 576                 return EH_HANDLED;
 577         }
 578         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 579                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 580                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 581                             "EH_RESET_TIMER\n",
 582                             cmd, task);
 583                 return EH_RESET_TIMER;
 584         }
 585         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 586         spin_unlock_irqrestore(&task->task_state_lock, flags);
 587
 588         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 589                     cmd, task);
 590
 591         return EH_NOT_HANDLED;
 592 }
 593
 594 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 595 {
 596         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 597         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 598         struct domain_device *found_dev = NULL;
 599         int i;
 600         unsigned long flags;
 601
 602         spin_lock_irqsave(&ha->phy_port_lock, flags);
 603         for (i = 0; i < ha->num_phys; i++) {
 604                 struct asd_sas_port *port = ha->sas_port[i];
 605                 struct domain_device *dev;
 606
 607                 spin_lock(&port->dev_list_lock);
 608                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 609                         if (rphy == dev->rphy) {
 610                                 found_dev = dev;
 611                                 spin_unlock(&port->dev_list_lock);
 612                                 goto found;
 613                         }
 614                 }
 615                 spin_unlock(&port->dev_list_lock);
 616         }
 617  found:
 618         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 619
 620         return found_dev;
 621 }
 622
 623 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 624 {
 625         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 626
 627         return sas_find_dev_by_rphy(rphy);
 628 }
 629
 630 int sas_target_alloc(struct scsi_target *starget)
 631 {
 632         struct domain_device *found_dev = sas_find_target(starget);
 633
 634         if (!found_dev)
 635                 return -ENODEV;
 636
 637         starget->hostdata = found_dev;
 638         return 0;
 639 }
 640
 641 #define SAS_DEF_QD 32
 642 #define SAS_MAX_QD 64
 643
 644 int sas_slave_configure(struct scsi_device *scsi_dev)
 645 {
 646         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 647         struct sas_ha_struct *sas_ha;
 648
 649         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 650
 651         sas_ha = dev->port->ha;
 652
 653         sas_read_port_mode_page(scsi_dev);
 654
 655         if (scsi_dev->tagged_supported) {
 656                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 657                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 658         } else {
 659                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 660                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 661                             scsi_dev->lun);
 662                 scsi_dev->tagged_supported = 0;
 663                 scsi_set_tag_type(scsi_dev, 0);
 664                 scsi_deactivate_tcq(scsi_dev, 1);
 665         }
 666
 667         return 0;
 668 }
 669
 670 void sas_slave_destroy(struct scsi_device *scsi_dev)
 671 {
 672 }
 673
 674 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
 675 {
 676         int res = min(new_depth, SAS_MAX_QD);
 677
 678         if (scsi_dev->tagged_supported)
 679                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 680                                         res);
 681         else {
 682                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 683                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 684                            SAS_ADDR(dev->sas_addr),
 685                            scsi_dev->lun);
 686                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 687                 res = 1;
 688         }
 689
 690         return res;
 691 }
 692
 693 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 694 {
 695         if (!scsi_dev->tagged_supported)
 696                 return 0;
 697
 698         scsi_deactivate_tcq(scsi_dev, 1);
 699
 700         scsi_set_tag_type(scsi_dev, qt);
 701         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 702
 703         return qt;
 704 }
 705
 706 int sas_bios_param(struct scsi_device *scsi_dev,
 707                           struct block_device *bdev,
 708                           sector_t capacity, int *hsc)
 709 {
 710         hsc[0] = 255;
 711         hsc[1] = 63;
 712         sector_div(capacity, 255*63);
 713         hsc[2] = capacity;
 714
 715         return 0;
 716 }
 717
 718 /* ---------- Task Collector Thread implementation ---------- */
 719
 720 static void sas_queue(struct sas_ha_struct *sas_ha)
 721 {
 722         struct scsi_core *core = &sas_ha->core;
 723         unsigned long flags;
 724         LIST_HEAD(q);
 725         int can_queue;
 726         int res;
 727         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 728
 729         spin_lock_irqsave(&core->task_queue_lock, flags);
 730         while (!core->queue_thread_kill &&
 731                !list_empty(&core->task_queue)) {
 732
 733                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 734                 if (can_queue >= 0) {
 735                         can_queue = core->task_queue_size;
 736                         list_splice_init(&core->task_queue, &q);
 737                 } else {
 738                         struct list_head *a, *n;
 739
 740                         can_queue = sas_ha->lldd_queue_size;
 741                         list_for_each_safe(a, n, &core->task_queue) {
 742                                 list_move_tail(a, &q);
 743                                 if (--can_queue == 0)
 744                                         break;
 745                         }
 746                         can_queue = sas_ha->lldd_queue_size;
 747                 }
 748                 core->task_queue_size -= can_queue;
 749                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 750                 {
 751                         struct sas_task *task = list_entry(q.next,
 752                                                            struct sas_task,
 753                                                            list);
 754                         list_del_init(&q);
 755                         res = i->dft->lldd_execute_task(task, can_queue,
 756                                                         GFP_KERNEL);
 757                         if (unlikely(res))
 758                                 __list_add(&q, task->list.prev, &task->list);
 759                 }
 760                 spin_lock_irqsave(&core->task_queue_lock, flags);
 761                 if (res) {
 762                         list_splice_init(&q, &core->task_queue); /*at head*/
 763                         core->task_queue_size += can_queue;
 764                 }
 765         }
 766         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 767 }
 768
 769 static DECLARE_COMPLETION(queue_th_comp);
 770
 771 /**
 772  * sas_queue_thread -- The Task Collector thread
 773  * @_sas_ha: pointer to struct sas_ha
 774  */
 775 static int sas_queue_thread(void *_sas_ha)
 776 {
 777         struct sas_ha_struct *sas_ha = _sas_ha;
 778         struct scsi_core *core = &sas_ha->core;
 779
 780         daemonize("sas_queue_%d", core->shost->host_no);
 781         current->flags |= PF_NOFREEZE;
 782
 783         complete(&queue_th_comp);
 784
 785         while (1) {
 786                 down_interruptible(&core->queue_thread_sema);
 787                 sas_queue(sas_ha);
 788                 if (core->queue_thread_kill)
 789                         break;
 790         }
 791
 792         complete(&queue_th_comp);
 793
 794         return 0;
 795 }
 796
 797 int sas_init_queue(struct sas_ha_struct *sas_ha)
 798 {
 799         int res;
 800         struct scsi_core *core = &sas_ha->core;
 801
 802         spin_lock_init(&core->task_queue_lock);
 803         core->task_queue_size = 0;
 804         INIT_LIST_HEAD(&core->task_queue);
 805         init_MUTEX_LOCKED(&core->queue_thread_sema);
 806
 807         res = kernel_thread(sas_queue_thread, sas_ha, 0);
 808         if (res >= 0)
 809                 wait_for_completion(&queue_th_comp);
 810
 811         return res < 0 ? res : 0;
 812 }
 813
 814 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 815 {
 816         unsigned long flags;
 817         struct scsi_core *core = &sas_ha->core;
 818         struct sas_task *task, *n;
 819
 820         init_completion(&queue_th_comp);
 821         core->queue_thread_kill = 1;
 822         up(&core->queue_thread_sema);
 823         wait_for_completion(&queue_th_comp);
 824
 825         if (!list_empty(&core->task_queue))
 826                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 827                             SAS_ADDR(sas_ha->sas_addr));
 828
 829         spin_lock_irqsave(&core->task_queue_lock, flags);
 830         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 831                 struct scsi_cmnd *cmd = task->uldd_task;
 832
 833                 list_del_init(&task->list);
 834
 835                 ASSIGN_SAS_TASK(cmd, NULL);
 836                 sas_free_task(task);
 837                 cmd->result = DID_ABORT << 16;
 838                 cmd->scsi_done(cmd);
 839         }
 840         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 841 }
 842
 843 /*
 844  * Call the LLDD task abort routine directly.  This function is intended for
 845  * use by upper layers that need to tell the LLDD to abort a task.
 846  */
 847 int __sas_task_abort(struct sas_task *task)
 848 {
 849         struct sas_internal *si =
 850                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 851         unsigned long flags;
 852         int res;
 853
 854         spin_lock_irqsave(&task->task_state_lock, flags);
 855         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 856             task->task_state_flags & SAS_TASK_STATE_DONE) {
 857                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 858                 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
 859                             task);
 860                 return 0;
 861         }
 862         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 863         spin_unlock_irqrestore(&task->task_state_lock, flags);
 864
 865         if (!si->dft->lldd_abort_task)
 866                 return -ENODEV;
 867
 868         res = si->dft->lldd_abort_task(task);
 869
 870         spin_lock_irqsave(&task->task_state_lock, flags);
 871         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
 872             (res == TMF_RESP_FUNC_COMPLETE))
 873         {
 874                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 875                 task->task_done(task);
 876                 return 0;
 877         }
 878
 879         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 880                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 881         spin_unlock_irqrestore(&task->task_state_lock, flags);
 882
 883         return -EAGAIN;
 884 }
 885
 886 /*
 887  * Tell an upper layer that it needs to initiate an abort for a given task.
 888  * This should only ever be called by an LLDD.
 889  */
 890 void sas_task_abort(struct sas_task *task)
 891 {
 892         struct scsi_cmnd *sc = task->uldd_task;
 893
 894         /* Escape for libsas internal commands */
 895         if (!sc) {
 896                 if (!del_timer(&task->timer))
 897                         return;
 898                 task->timer.function(task->timer.data);
 899                 return;
 900         }
 901
 902         scsi_req_abort_cmd(sc);
 903         scsi_schedule_eh(sc->device->host);
 904 }
 905
 906 EXPORT_SYMBOL_GPL(sas_queuecommand);
 907 EXPORT_SYMBOL_GPL(sas_target_alloc);
 908 EXPORT_SYMBOL_GPL(sas_slave_configure);
 909 EXPORT_SYMBOL_GPL(sas_slave_destroy);
 910 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
 911 EXPORT_SYMBOL_GPL(sas_change_queue_type);
 912 EXPORT_SYMBOL_GPL(sas_bios_param);
 913 EXPORT_SYMBOL_GPL(__sas_task_abort);
 914 EXPORT_SYMBOL_GPL(sas_task_abort);
 915 EXPORT_SYMBOL_GPL(sas_phy_reset);
 916 EXPORT_SYMBOL_GPL(sas_phy_enable);