git.oblomov.eu Git - 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 <linux/kthread.h>
  27
  28 #include "sas_internal.h"
  29
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_device.h>
  32 #include <scsi/scsi_tcq.h>
  33 #include <scsi/scsi.h>
  34 #include <scsi/scsi_eh.h>
  35 #include <scsi/scsi_transport.h>
  36 #include <scsi/scsi_transport_sas.h>
  37 #include <scsi/sas_ata.h>
  38 #include "../scsi_sas_internal.h"
  39 #include "../scsi_transport_api.h"
  40 #include "../scsi_priv.h"
  41
  42 #include <linux/err.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/freezer.h>
  45 #include <linux/scatterlist.h>
  46 #include <linux/libata.h>
  47
  48 /* ---------- SCSI Host glue ---------- */
  49
  50 static void sas_scsi_task_done(struct sas_task *task)
  51 {
  52         struct task_status_struct *ts = &task->task_status;
  53         struct scsi_cmnd *sc = task->uldd_task;
  54         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(sc->device->host);
  55         unsigned ts_flags = task->task_state_flags;
  56         int hs = 0, stat = 0;
  57
  58         if (unlikely(!sc)) {
  59                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  60                 list_del_init(&task->list);
  61                 sas_free_task(task);
  62                 return;
  63         }
  64
  65         if (ts->resp == SAS_TASK_UNDELIVERED) {
  66                 /* transport error */
  67                 hs = DID_NO_CONNECT;
  68         } else { /* ts->resp == SAS_TASK_COMPLETE */
  69                 /* task delivered, what happened afterwards? */
  70                 switch (ts->stat) {
  71                 case SAS_DEV_NO_RESPONSE:
  72                 case SAS_INTERRUPTED:
  73                 case SAS_PHY_DOWN:
  74                 case SAS_NAK_R_ERR:
  75                 case SAS_OPEN_TO:
  76                         hs = DID_NO_CONNECT;
  77                         break;
  78                 case SAS_DATA_UNDERRUN:
  79                         scsi_set_resid(sc, ts->residual);
  80                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  81                                 hs = DID_ERROR;
  82                         break;
  83                 case SAS_DATA_OVERRUN:
  84                         hs = DID_ERROR;
  85                         break;
  86                 case SAS_QUEUE_FULL:
  87                         hs = DID_SOFT_ERROR; /* retry */
  88                         break;
  89                 case SAS_DEVICE_UNKNOWN:
  90                         hs = DID_BAD_TARGET;
  91                         break;
  92                 case SAS_SG_ERR:
  93                         hs = DID_PARITY;
  94                         break;
  95                 case SAS_OPEN_REJECT:
  96                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
  97                                 hs = DID_SOFT_ERROR; /* retry */
  98                         else
  99                                 hs = DID_ERROR;
 100                         break;
 101                 case SAS_PROTO_RESPONSE:
 102                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
 103                                     "task; please report this\n",
 104                                     task->dev->port->ha->sas_ha_name);
 105                         break;
 106                 case SAS_ABORTED_TASK:
 107                         hs = DID_ABORT;
 108                         break;
 109                 case SAM_CHECK_COND:
 110                         memcpy(sc->sense_buffer, ts->buf,
 111                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 112                         stat = SAM_CHECK_COND;
 113                         break;
 114                 default:
 115                         stat = ts->stat;
 116                         break;
 117                 }
 118         }
 119         ASSIGN_SAS_TASK(sc, NULL);
 120         sc->result = (hs << 16) | stat;
 121         list_del_init(&task->list);
 122         sas_free_task(task);
 123         /* This is very ugly but this is how SCSI Core works. */
 124         if (ts_flags & SAS_TASK_STATE_ABORTED)
 125                 scsi_eh_finish_cmd(sc, &sas_ha->eh_done_q);
 126         else
 127                 sc->scsi_done(sc);
 128 }
 129
 130 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
 131 {
 132         enum task_attribute ta = TASK_ATTR_SIMPLE;
 133         if (cmd->request && blk_rq_tagged(cmd->request)) {
 134                 if (cmd->device->ordered_tags &&
 135                     (cmd->request->cmd_flags & REQ_HARDBARRIER))
 136                         ta = TASK_ATTR_ORDERED;
 137         }
 138         return ta;
 139 }
 140
 141 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 142                                                struct domain_device *dev,
 143                                                gfp_t gfp_flags)
 144 {
 145         struct sas_task *task = sas_alloc_task(gfp_flags);
 146         struct scsi_lun lun;
 147
 148         if (!task)
 149                 return NULL;
 150
 151         task->uldd_task = cmd;
 152         ASSIGN_SAS_TASK(cmd, task);
 153
 154         task->dev = dev;
 155         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 156
 157         task->ssp_task.retry_count = 1;
 158         int_to_scsilun(cmd->device->lun, &lun);
 159         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 160         task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
 161         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 162
 163         task->scatter = scsi_sglist(cmd);
 164         task->num_scatter = scsi_sg_count(cmd);
 165         task->total_xfer_len = scsi_bufflen(cmd);
 166         task->data_dir = cmd->sc_data_direction;
 167
 168         task->task_done = sas_scsi_task_done;
 169
 170         return task;
 171 }
 172
 173 int sas_queue_up(struct sas_task *task)
 174 {
 175         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 176         struct scsi_core *core = &sas_ha->core;
 177         unsigned long flags;
 178         LIST_HEAD(list);
 179
 180         spin_lock_irqsave(&core->task_queue_lock, flags);
 181         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 182                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 183                 return -SAS_QUEUE_FULL;
 184         }
 185         list_add_tail(&task->list, &core->task_queue);
 186         core->task_queue_size += 1;
 187         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 188         wake_up_process(core->queue_thread);
 189
 190         return 0;
 191 }
 192
 193 /**
 194  * sas_queuecommand -- Enqueue a command for processing
 195  * @parameters: See SCSI Core documentation
 196  *
 197  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
 198  * call us without holding an IRQ spinlock...
 199  */
 200 int sas_queuecommand(struct scsi_cmnd *cmd,
 201                      void (*scsi_done)(struct scsi_cmnd *))
 202         __releases(host->host_lock)
 203         __acquires(dev->sata_dev.ap->lock)
 204         __releases(dev->sata_dev.ap->lock)
 205         __acquires(host->host_lock)
 206 {
 207         int res = 0;
 208         struct domain_device *dev = cmd_to_domain_dev(cmd);
 209         struct Scsi_Host *host = cmd->device->host;
 210         struct sas_internal *i = to_sas_internal(host->transportt);
 211
 212         spin_unlock_irq(host->host_lock);
 213
 214         {
 215                 struct sas_ha_struct *sas_ha = dev->port->ha;
 216                 struct sas_task *task;
 217
 218                 if (dev_is_sata(dev)) {
 219                         unsigned long flags;
 220
 221                         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 222                         res = ata_sas_queuecmd(cmd, scsi_done,
 223                                                dev->sata_dev.ap);
 224                         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 225                         goto out;
 226                 }
 227
 228                 res = -ENOMEM;
 229                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
 230                 if (!task)
 231                         goto out;
 232
 233                 cmd->scsi_done = scsi_done;
 234                 /* Queue up, Direct Mode or Task Collector Mode. */
 235                 if (sas_ha->lldd_max_execute_num < 2)
 236                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 237                 else
 238                         res = sas_queue_up(task);
 239
 240                 /* Examine */
 241                 if (res) {
 242                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 243                         ASSIGN_SAS_TASK(cmd, NULL);
 244                         sas_free_task(task);
 245                         if (res == -SAS_QUEUE_FULL) {
 246                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 247                                 res = 0;
 248                                 scsi_done(cmd);
 249                         }
 250                         goto out;
 251                 }
 252         }
 253 out:
 254         spin_lock_irq(host->host_lock);
 255         return res;
 256 }
 257
 258 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 259 {
 260         struct scsi_cmnd *cmd, *n;
 261
 262         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 263                 if (cmd == my_cmd)
 264                         list_del_init(&cmd->eh_entry);
 265         }
 266 }
 267
 268 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 269                                      struct domain_device *dev)
 270 {
 271         struct scsi_cmnd *cmd, *n;
 272
 273         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 274                 struct domain_device *x = cmd_to_domain_dev(cmd);
 275
 276                 if (x == dev)
 277                         list_del_init(&cmd->eh_entry);
 278         }
 279 }
 280
 281 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 282                                       struct asd_sas_port *port)
 283 {
 284         struct scsi_cmnd *cmd, *n;
 285
 286         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 287                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 288                 struct asd_sas_port *x = dev->port;
 289
 290                 if (x == port)
 291                         list_del_init(&cmd->eh_entry);
 292         }
 293 }
 294
 295 enum task_disposition {
 296         TASK_IS_DONE,
 297         TASK_IS_ABORTED,
 298         TASK_IS_AT_LU,
 299         TASK_IS_NOT_AT_LU,
 300         TASK_ABORT_FAILED,
 301 };
 302
 303 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 304 {
 305         struct sas_ha_struct *ha = task->dev->port->ha;
 306         unsigned long flags;
 307         int i, res;
 308         struct sas_internal *si =
 309                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 310
 311         if (ha->lldd_max_execute_num > 1) {
 312                 struct scsi_core *core = &ha->core;
 313                 struct sas_task *t, *n;
 314
 315                 spin_lock_irqsave(&core->task_queue_lock, flags);
 316                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 317                         if (task == t) {
 318                                 list_del_init(&t->list);
 319                                 spin_unlock_irqrestore(&core->task_queue_lock,
 320                                                        flags);
 321                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 322                                             "task_queue\n",
 323                                             __FUNCTION__, task);
 324                                 return TASK_IS_ABORTED;
 325                         }
 326                 }
 327                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 328         }
 329
 330         for (i = 0; i < 5; i++) {
 331                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 332                 res = si->dft->lldd_abort_task(task);
 333
 334                 spin_lock_irqsave(&task->task_state_lock, flags);
 335                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 336                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 337                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 338                                     task);
 339                         return TASK_IS_DONE;
 340                 }
 341                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 342
 343                 if (res == TMF_RESP_FUNC_COMPLETE) {
 344                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 345                                     __FUNCTION__, task);
 346                         return TASK_IS_ABORTED;
 347                 } else if (si->dft->lldd_query_task) {
 348                         SAS_DPRINTK("%s: querying task 0x%p\n",
 349                                     __FUNCTION__, task);
 350                         res = si->dft->lldd_query_task(task);
 351                         switch (res) {
 352                         case TMF_RESP_FUNC_SUCC:
 353                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 354                                             __FUNCTION__, task);
 355                                 return TASK_IS_AT_LU;
 356                         case TMF_RESP_FUNC_COMPLETE:
 357                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 358                                             __FUNCTION__, task);
 359                                 return TASK_IS_NOT_AT_LU;
 360                         case TMF_RESP_FUNC_FAILED:
 361                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 362                                                 __FUNCTION__, task);
 363                                 return TASK_ABORT_FAILED;
 364                         }
 365
 366                 }
 367         }
 368         return res;
 369 }
 370
 371 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 372 {
 373         int res = TMF_RESP_FUNC_FAILED;
 374         struct scsi_lun lun;
 375         struct sas_internal *i =
 376                 to_sas_internal(dev->port->ha->core.shost->transportt);
 377
 378         int_to_scsilun(cmd->device->lun, &lun);
 379
 380         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 381                     SAS_ADDR(dev->sas_addr),
 382                     cmd->device->lun);
 383
 384         if (i->dft->lldd_abort_task_set)
 385                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 386
 387         if (res == TMF_RESP_FUNC_FAILED) {
 388                 if (i->dft->lldd_clear_task_set)
 389                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 390         }
 391
 392         if (res == TMF_RESP_FUNC_FAILED) {
 393                 if (i->dft->lldd_lu_reset)
 394                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 395         }
 396
 397         return res;
 398 }
 399
 400 static int sas_recover_I_T(struct domain_device *dev)
 401 {
 402         int res = TMF_RESP_FUNC_FAILED;
 403         struct sas_internal *i =
 404                 to_sas_internal(dev->port->ha->core.shost->transportt);
 405
 406         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 407                     SAS_ADDR(dev->sas_addr));
 408
 409         if (i->dft->lldd_I_T_nexus_reset)
 410                 res = i->dft->lldd_I_T_nexus_reset(dev);
 411
 412         return res;
 413 }
 414
 415 /* Find the sas_phy that's attached to this device */
 416 static struct sas_phy *find_local_sas_phy(struct domain_device *dev)
 417 {
 418         struct domain_device *pdev = dev->parent;
 419         struct ex_phy *exphy = NULL;
 420         int i;
 421
 422         /* Directly attached device */
 423         if (!pdev)
 424                 return dev->port->phy;
 425
 426         /* Otherwise look in the expander */
 427         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 428                 if (!memcmp(dev->sas_addr,
 429                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 430                             SAS_ADDR_SIZE)) {
 431                         exphy = &pdev->ex_dev.ex_phy[i];
 432                         break;
 433                 }
 434
 435         BUG_ON(!exphy);
 436         return exphy->phy;
 437 }
 438
 439 /* Attempt to send a LUN reset message to a device */
 440 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 441 {
 442         struct domain_device *dev = cmd_to_domain_dev(cmd);
 443         struct sas_internal *i =
 444                 to_sas_internal(dev->port->ha->core.shost->transportt);
 445         struct scsi_lun lun;
 446         int res;
 447
 448         int_to_scsilun(cmd->device->lun, &lun);
 449
 450         if (!i->dft->lldd_lu_reset)
 451                 return FAILED;
 452
 453         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 454         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 455                 return SUCCESS;
 456
 457         return FAILED;
 458 }
 459
 460 /* Attempt to send a phy (bus) reset */
 461 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 462 {
 463         struct domain_device *dev = cmd_to_domain_dev(cmd);
 464         struct sas_phy *phy = find_local_sas_phy(dev);
 465         int res;
 466
 467         res = sas_phy_reset(phy, 1);
 468         if (res)
 469                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 470                             kobject_name(&phy->dev.kobj),
 471                             res);
 472         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 473                 return SUCCESS;
 474
 475         return FAILED;
 476 }
 477
 478 /* Try to reset a device */
 479 static int try_to_reset_cmd_device(struct Scsi_Host *shost,
 480                                    struct scsi_cmnd *cmd)
 481 {
 482         int res;
 483
 484         if (!shost->hostt->eh_device_reset_handler)
 485                 goto try_bus_reset;
 486
 487         res = shost->hostt->eh_device_reset_handler(cmd);
 488         if (res == SUCCESS)
 489                 return res;
 490
 491 try_bus_reset:
 492         if (shost->hostt->eh_bus_reset_handler)
 493                 return shost->hostt->eh_bus_reset_handler(cmd);
 494
 495         return FAILED;
 496 }
 497
 498 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 499                                     struct list_head *work_q,
 500                                     struct list_head *done_q)
 501 {
 502         struct scsi_cmnd *cmd, *n;
 503         enum task_disposition res = TASK_IS_DONE;
 504         int tmf_resp, need_reset;
 505         struct sas_internal *i = to_sas_internal(shost->transportt);
 506         unsigned long flags;
 507         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 508
 509 Again:
 510         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 511                 struct sas_task *task = TO_SAS_TASK(cmd);
 512
 513                 if (!task)
 514                         continue;
 515
 516                 list_del_init(&cmd->eh_entry);
 517
 518                 spin_lock_irqsave(&task->task_state_lock, flags);
 519                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 520                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 521
 522                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 523                 res = sas_scsi_find_task(task);
 524
 525                 cmd->eh_eflags = 0;
 526
 527                 switch (res) {
 528                 case TASK_IS_DONE:
 529                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 530                                     task);
 531                         task->task_done(task);
 532                         if (need_reset)
 533                                 try_to_reset_cmd_device(shost, cmd);
 534                         continue;
 535                 case TASK_IS_ABORTED:
 536                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 537                                     __FUNCTION__, task);
 538                         task->task_done(task);
 539                         if (need_reset)
 540                                 try_to_reset_cmd_device(shost, cmd);
 541                         continue;
 542                 case TASK_IS_AT_LU:
 543                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 544                         tmf_resp = sas_recover_lu(task->dev, cmd);
 545                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 546                                 SAS_DPRINTK("dev %016llx LU %x is "
 547                                             "recovered\n",
 548                                             SAS_ADDR(task->dev),
 549                                             cmd->device->lun);
 550                                 task->task_done(task);
 551                                 if (need_reset)
 552                                         try_to_reset_cmd_device(shost, cmd);
 553                                 sas_scsi_clear_queue_lu(work_q, cmd);
 554                                 goto Again;
 555                         }
 556                         /* fallthrough */
 557                 case TASK_IS_NOT_AT_LU:
 558                 case TASK_ABORT_FAILED:
 559                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 560                                     task);
 561                         tmf_resp = sas_recover_I_T(task->dev);
 562                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 563                                 SAS_DPRINTK("I_T %016llx recovered\n",
 564                                             SAS_ADDR(task->dev->sas_addr));
 565                                 task->task_done(task);
 566                                 if (need_reset)
 567                                         try_to_reset_cmd_device(shost, cmd);
 568                                 sas_scsi_clear_queue_I_T(work_q, task->dev);
 569                                 goto Again;
 570                         }
 571                         /* Hammer time :-) */
 572                         if (i->dft->lldd_clear_nexus_port) {
 573                                 struct asd_sas_port *port = task->dev->port;
 574                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 575                                             port->id);
 576                                 res = i->dft->lldd_clear_nexus_port(port);
 577                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 578                                         SAS_DPRINTK("clear nexus port:%d "
 579                                                     "succeeded\n", port->id);
 580                                         task->task_done(task);
 581                                         if (need_reset)
 582                                                 try_to_reset_cmd_device(shost, cmd);
 583                                         sas_scsi_clear_queue_port(work_q,
 584                                                                   port);
 585                                         goto Again;
 586                                 }
 587                         }
 588                         if (i->dft->lldd_clear_nexus_ha) {
 589                                 SAS_DPRINTK("clear nexus ha\n");
 590                                 res = i->dft->lldd_clear_nexus_ha(ha);
 591                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 592                                         SAS_DPRINTK("clear nexus ha "
 593                                                     "succeeded\n");
 594                                         task->task_done(task);
 595                                         if (need_reset)
 596                                                 try_to_reset_cmd_device(shost, cmd);
 597                                         goto out;
 598                                 }
 599                         }
 600                         /* If we are here -- this means that no amount
 601                          * of effort could recover from errors.  Quite
 602                          * possibly the HA just disappeared.
 603                          */
 604                         SAS_DPRINTK("error from  device %llx, LUN %x "
 605                                     "couldn't be recovered in any way\n",
 606                                     SAS_ADDR(task->dev->sas_addr),
 607                                     cmd->device->lun);
 608
 609                         task->task_done(task);
 610                         if (need_reset)
 611                                 try_to_reset_cmd_device(shost, cmd);
 612                         goto clear_q;
 613                 }
 614         }
 615 out:
 616         return list_empty(work_q);
 617 clear_q:
 618         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 619         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 620                 struct sas_task *task = TO_SAS_TASK(cmd);
 621                 list_del_init(&cmd->eh_entry);
 622                 task->task_done(task);
 623         }
 624         return list_empty(work_q);
 625 }
 626
 627 void sas_scsi_recover_host(struct Scsi_Host *shost)
 628 {
 629         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 630         unsigned long flags;
 631         LIST_HEAD(eh_work_q);
 632
 633         spin_lock_irqsave(shost->host_lock, flags);
 634         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 635         spin_unlock_irqrestore(shost->host_lock, flags);
 636
 637         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 638         /*
 639          * Deal with commands that still have SAS tasks (i.e. they didn't
 640          * complete via the normal sas_task completion mechanism)
 641          */
 642         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 643                 goto out;
 644
 645         /*
 646          * Now deal with SCSI commands that completed ok but have a an error
 647          * code (and hopefully sense data) attached.  This is roughly what
 648          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 649          * command we see here has no sas_task and is thus unknown to the HA.
 650          */
 651         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 652                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 653
 654 out:
 655         scsi_eh_flush_done_q(&ha->eh_done_q);
 656         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 657         return;
 658 }
 659
 660 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 661 {
 662         struct sas_task *task = TO_SAS_TASK(cmd);
 663         unsigned long flags;
 664
 665         if (!task) {
 666                 cmd->timeout_per_command /= 2;
 667                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 668                             cmd, task, (cmd->timeout_per_command ?
 669                             "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
 670                 if (!cmd->timeout_per_command)
 671                         return EH_NOT_HANDLED;
 672                 return EH_RESET_TIMER;
 673         }
 674
 675         spin_lock_irqsave(&task->task_state_lock, flags);
 676         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 677         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 678                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 679                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 680                             cmd, task);
 681                 return EH_HANDLED;
 682         }
 683         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 684                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 685                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 686                             "EH_RESET_TIMER\n",
 687                             cmd, task);
 688                 return EH_RESET_TIMER;
 689         }
 690         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 691         spin_unlock_irqrestore(&task->task_state_lock, flags);
 692
 693         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 694                     cmd, task);
 695
 696         return EH_NOT_HANDLED;
 697 }
 698
 699 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 700 {
 701         struct domain_device *dev = sdev_to_domain_dev(sdev);
 702
 703         if (dev_is_sata(dev))
 704                 return ata_scsi_ioctl(sdev, cmd, arg);
 705
 706         return -EINVAL;
 707 }
 708
 709 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 710 {
 711         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 712         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 713         struct domain_device *found_dev = NULL;
 714         int i;
 715         unsigned long flags;
 716
 717         spin_lock_irqsave(&ha->phy_port_lock, flags);
 718         for (i = 0; i < ha->num_phys; i++) {
 719                 struct asd_sas_port *port = ha->sas_port[i];
 720                 struct domain_device *dev;
 721
 722                 spin_lock(&port->dev_list_lock);
 723                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 724                         if (rphy == dev->rphy) {
 725                                 found_dev = dev;
 726                                 spin_unlock(&port->dev_list_lock);
 727                                 goto found;
 728                         }
 729                 }
 730                 spin_unlock(&port->dev_list_lock);
 731         }
 732  found:
 733         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 734
 735         return found_dev;
 736 }
 737
 738 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 739 {
 740         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 741
 742         return sas_find_dev_by_rphy(rphy);
 743 }
 744
 745 int sas_target_alloc(struct scsi_target *starget)
 746 {
 747         struct domain_device *found_dev = sas_find_target(starget);
 748         int res;
 749
 750         if (!found_dev)
 751                 return -ENODEV;
 752
 753         if (dev_is_sata(found_dev)) {
 754                 res = sas_ata_init_host_and_port(found_dev, starget);
 755                 if (res)
 756                         return res;
 757         }
 758
 759         starget->hostdata = found_dev;
 760         return 0;
 761 }
 762
 763 #define SAS_DEF_QD 32
 764 #define SAS_MAX_QD 64
 765
 766 int sas_slave_configure(struct scsi_device *scsi_dev)
 767 {
 768         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 769         struct sas_ha_struct *sas_ha;
 770
 771         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 772
 773         if (dev_is_sata(dev)) {
 774                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 775                 return 0;
 776         }
 777
 778         sas_ha = dev->port->ha;
 779
 780         sas_read_port_mode_page(scsi_dev);
 781
 782         if (scsi_dev->tagged_supported) {
 783                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 784                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 785         } else {
 786                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 787                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 788                             scsi_dev->lun);
 789                 scsi_dev->tagged_supported = 0;
 790                 scsi_set_tag_type(scsi_dev, 0);
 791                 scsi_deactivate_tcq(scsi_dev, 1);
 792         }
 793
 794         scsi_dev->allow_restart = 1;
 795
 796         return 0;
 797 }
 798
 799 void sas_slave_destroy(struct scsi_device *scsi_dev)
 800 {
 801         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 802
 803         if (dev_is_sata(dev))
 804                 ata_port_disable(dev->sata_dev.ap);
 805 }
 806
 807 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
 808 {
 809         int res = min(new_depth, SAS_MAX_QD);
 810
 811         if (scsi_dev->tagged_supported)
 812                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 813                                         res);
 814         else {
 815                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 816                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 817                            SAS_ADDR(dev->sas_addr),
 818                            scsi_dev->lun);
 819                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 820                 res = 1;
 821         }
 822
 823         return res;
 824 }
 825
 826 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 827 {
 828         if (!scsi_dev->tagged_supported)
 829                 return 0;
 830
 831         scsi_deactivate_tcq(scsi_dev, 1);
 832
 833         scsi_set_tag_type(scsi_dev, qt);
 834         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 835
 836         return qt;
 837 }
 838
 839 int sas_bios_param(struct scsi_device *scsi_dev,
 840                           struct block_device *bdev,
 841                           sector_t capacity, int *hsc)
 842 {
 843         hsc[0] = 255;
 844         hsc[1] = 63;
 845         sector_div(capacity, 255*63);
 846         hsc[2] = capacity;
 847
 848         return 0;
 849 }
 850
 851 /* ---------- Task Collector Thread implementation ---------- */
 852
 853 static void sas_queue(struct sas_ha_struct *sas_ha)
 854 {
 855         struct scsi_core *core = &sas_ha->core;
 856         unsigned long flags;
 857         LIST_HEAD(q);
 858         int can_queue;
 859         int res;
 860         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 861
 862         spin_lock_irqsave(&core->task_queue_lock, flags);
 863         while (!kthread_should_stop() &&
 864                !list_empty(&core->task_queue)) {
 865
 866                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 867                 if (can_queue >= 0) {
 868                         can_queue = core->task_queue_size;
 869                         list_splice_init(&core->task_queue, &q);
 870                 } else {
 871                         struct list_head *a, *n;
 872
 873                         can_queue = sas_ha->lldd_queue_size;
 874                         list_for_each_safe(a, n, &core->task_queue) {
 875                                 list_move_tail(a, &q);
 876                                 if (--can_queue == 0)
 877                                         break;
 878                         }
 879                         can_queue = sas_ha->lldd_queue_size;
 880                 }
 881                 core->task_queue_size -= can_queue;
 882                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 883                 {
 884                         struct sas_task *task = list_entry(q.next,
 885                                                            struct sas_task,
 886                                                            list);
 887                         list_del_init(&q);
 888                         res = i->dft->lldd_execute_task(task, can_queue,
 889                                                         GFP_KERNEL);
 890                         if (unlikely(res))
 891                                 __list_add(&q, task->list.prev, &task->list);
 892                 }
 893                 spin_lock_irqsave(&core->task_queue_lock, flags);
 894                 if (res) {
 895                         list_splice_init(&q, &core->task_queue); /*at head*/
 896                         core->task_queue_size += can_queue;
 897                 }
 898         }
 899         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 900 }
 901
 902 /**
 903  * sas_queue_thread -- The Task Collector thread
 904  * @_sas_ha: pointer to struct sas_ha
 905  */
 906 static int sas_queue_thread(void *_sas_ha)
 907 {
 908         struct sas_ha_struct *sas_ha = _sas_ha;
 909
 910         while (1) {
 911                 set_current_state(TASK_INTERRUPTIBLE);
 912                 schedule();
 913                 sas_queue(sas_ha);
 914                 if (kthread_should_stop())
 915                         break;
 916         }
 917
 918         return 0;
 919 }
 920
 921 int sas_init_queue(struct sas_ha_struct *sas_ha)
 922 {
 923         struct scsi_core *core = &sas_ha->core;
 924
 925         spin_lock_init(&core->task_queue_lock);
 926         core->task_queue_size = 0;
 927         INIT_LIST_HEAD(&core->task_queue);
 928
 929         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 930                                          "sas_queue_%d", core->shost->host_no);
 931         if (IS_ERR(core->queue_thread))
 932                 return PTR_ERR(core->queue_thread);
 933         return 0;
 934 }
 935
 936 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 937 {
 938         unsigned long flags;
 939         struct scsi_core *core = &sas_ha->core;
 940         struct sas_task *task, *n;
 941
 942         kthread_stop(core->queue_thread);
 943
 944         if (!list_empty(&core->task_queue))
 945                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 946                             SAS_ADDR(sas_ha->sas_addr));
 947
 948         spin_lock_irqsave(&core->task_queue_lock, flags);
 949         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 950                 struct scsi_cmnd *cmd = task->uldd_task;
 951
 952                 list_del_init(&task->list);
 953
 954                 ASSIGN_SAS_TASK(cmd, NULL);
 955                 sas_free_task(task);
 956                 cmd->result = DID_ABORT << 16;
 957                 cmd->scsi_done(cmd);
 958         }
 959         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 960 }
 961
 962 /*
 963  * Call the LLDD task abort routine directly.  This function is intended for
 964  * use by upper layers that need to tell the LLDD to abort a task.
 965  */
 966 int __sas_task_abort(struct sas_task *task)
 967 {
 968         struct sas_internal *si =
 969                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 970         unsigned long flags;
 971         int res;
 972
 973         spin_lock_irqsave(&task->task_state_lock, flags);
 974         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 975             task->task_state_flags & SAS_TASK_STATE_DONE) {
 976                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 977                 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
 978                             task);
 979                 return 0;
 980         }
 981         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 982         spin_unlock_irqrestore(&task->task_state_lock, flags);
 983
 984         if (!si->dft->lldd_abort_task)
 985                 return -ENODEV;
 986
 987         res = si->dft->lldd_abort_task(task);
 988
 989         spin_lock_irqsave(&task->task_state_lock, flags);
 990         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
 991             (res == TMF_RESP_FUNC_COMPLETE))
 992         {
 993                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 994                 task->task_done(task);
 995                 return 0;
 996         }
 997
 998         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 999                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1000         spin_unlock_irqrestore(&task->task_state_lock, flags);
1001
1002         return -EAGAIN;
1003 }
1004
1005 /*
1006  * Tell an upper layer that it needs to initiate an abort for a given task.
1007  * This should only ever be called by an LLDD.
1008  */
1009 void sas_task_abort(struct sas_task *task)
1010 {
1011         struct scsi_cmnd *sc = task->uldd_task;
1012
1013         /* Escape for libsas internal commands */
1014         if (!sc) {
1015                 if (!del_timer(&task->timer))
1016                         return;
1017                 task->timer.function(task->timer.data);
1018                 return;
1019         }
1020
1021         if (dev_is_sata(task->dev)) {
1022                 sas_ata_task_abort(task);
1023                 return;
1024         }
1025
1026         scsi_req_abort_cmd(sc);
1027         scsi_schedule_eh(sc->device->host);
1028 }
1029
1030 int sas_slave_alloc(struct scsi_device *scsi_dev)
1031 {
1032         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1033
1034         if (dev_is_sata(dev))
1035                 return ata_sas_port_init(dev->sata_dev.ap);
1036
1037         return 0;
1038 }
1039
1040 void sas_target_destroy(struct scsi_target *starget)
1041 {
1042         struct domain_device *found_dev = sas_find_target(starget);
1043
1044         if (!found_dev)
1045                 return;
1046
1047         if (dev_is_sata(found_dev))
1048                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1049
1050         return;
1051 }
1052
1053 EXPORT_SYMBOL_GPL(sas_queuecommand);
1054 EXPORT_SYMBOL_GPL(sas_target_alloc);
1055 EXPORT_SYMBOL_GPL(sas_slave_configure);
1056 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1057 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1058 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1059 EXPORT_SYMBOL_GPL(sas_bios_param);
1060 EXPORT_SYMBOL_GPL(__sas_task_abort);
1061 EXPORT_SYMBOL_GPL(sas_task_abort);
1062 EXPORT_SYMBOL_GPL(sas_phy_reset);
1063 EXPORT_SYMBOL_GPL(sas_phy_enable);
1064 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1065 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1066 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1067 EXPORT_SYMBOL_GPL(sas_target_destroy);
1068 EXPORT_SYMBOL_GPL(sas_ioctl);