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 <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                                max(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         *(u32 *)cmd->sense_buffer = 0;
 152         task->uldd_task = cmd;
 153         ASSIGN_SAS_TASK(cmd, task);
 154
 155         task->dev = dev;
 156         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 157
 158         task->ssp_task.retry_count = 1;
 159         int_to_scsilun(cmd->device->lun, &lun);
 160         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 161         task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
 162         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 163
 164         task->scatter = scsi_sglist(cmd);
 165         task->num_scatter = scsi_sg_count(cmd);
 166         task->total_xfer_len = scsi_bufflen(cmd);
 167         task->data_dir = cmd->sc_data_direction;
 168
 169         task->task_done = sas_scsi_task_done;
 170
 171         return task;
 172 }
 173
 174 int sas_queue_up(struct sas_task *task)
 175 {
 176         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 177         struct scsi_core *core = &sas_ha->core;
 178         unsigned long flags;
 179         LIST_HEAD(list);
 180
 181         spin_lock_irqsave(&core->task_queue_lock, flags);
 182         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 183                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 184                 return -SAS_QUEUE_FULL;
 185         }
 186         list_add_tail(&task->list, &core->task_queue);
 187         core->task_queue_size += 1;
 188         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 189         wake_up_process(core->queue_thread);
 190
 191         return 0;
 192 }
 193
 194 /**
 195  * sas_queuecommand -- Enqueue a command for processing
 196  * @parameters: See SCSI Core documentation
 197  *
 198  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
 199  * call us without holding an IRQ spinlock...
 200  */
 201 int sas_queuecommand(struct scsi_cmnd *cmd,
 202                      void (*scsi_done)(struct scsi_cmnd *))
 203 {
 204         int res = 0;
 205         struct domain_device *dev = cmd_to_domain_dev(cmd);
 206         struct Scsi_Host *host = cmd->device->host;
 207         struct sas_internal *i = to_sas_internal(host->transportt);
 208
 209         spin_unlock_irq(host->host_lock);
 210
 211         {
 212                 struct sas_ha_struct *sas_ha = dev->port->ha;
 213                 struct sas_task *task;
 214
 215                 if (dev_is_sata(dev)) {
 216                         unsigned long flags;
 217
 218                         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 219                         res = ata_sas_queuecmd(cmd, scsi_done,
 220                                                dev->sata_dev.ap);
 221                         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 222                         goto out;
 223                 }
 224
 225                 res = -ENOMEM;
 226                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
 227                 if (!task)
 228                         goto out;
 229
 230                 cmd->scsi_done = scsi_done;
 231                 /* Queue up, Direct Mode or Task Collector Mode. */
 232                 if (sas_ha->lldd_max_execute_num < 2)
 233                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 234                 else
 235                         res = sas_queue_up(task);
 236
 237                 /* Examine */
 238                 if (res) {
 239                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 240                         ASSIGN_SAS_TASK(cmd, NULL);
 241                         sas_free_task(task);
 242                         if (res == -SAS_QUEUE_FULL) {
 243                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 244                                 res = 0;
 245                                 scsi_done(cmd);
 246                         }
 247                         goto out;
 248                 }
 249         }
 250 out:
 251         spin_lock_irq(host->host_lock);
 252         return res;
 253 }
 254
 255 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 256 {
 257         struct scsi_cmnd *cmd, *n;
 258
 259         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 260                 if (cmd == my_cmd)
 261                         list_del_init(&cmd->eh_entry);
 262         }
 263 }
 264
 265 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 266                                      struct domain_device *dev)
 267 {
 268         struct scsi_cmnd *cmd, *n;
 269
 270         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 271                 struct domain_device *x = cmd_to_domain_dev(cmd);
 272
 273                 if (x == dev)
 274                         list_del_init(&cmd->eh_entry);
 275         }
 276 }
 277
 278 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 279                                       struct asd_sas_port *port)
 280 {
 281         struct scsi_cmnd *cmd, *n;
 282
 283         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 284                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 285                 struct asd_sas_port *x = dev->port;
 286
 287                 if (x == port)
 288                         list_del_init(&cmd->eh_entry);
 289         }
 290 }
 291
 292 enum task_disposition {
 293         TASK_IS_DONE,
 294         TASK_IS_ABORTED,
 295         TASK_IS_AT_LU,
 296         TASK_IS_NOT_AT_LU,
 297         TASK_ABORT_FAILED,
 298 };
 299
 300 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 301 {
 302         struct sas_ha_struct *ha = task->dev->port->ha;
 303         unsigned long flags;
 304         int i, res;
 305         struct sas_internal *si =
 306                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 307
 308         if (ha->lldd_max_execute_num > 1) {
 309                 struct scsi_core *core = &ha->core;
 310                 struct sas_task *t, *n;
 311
 312                 spin_lock_irqsave(&core->task_queue_lock, flags);
 313                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 314                         if (task == t) {
 315                                 list_del_init(&t->list);
 316                                 spin_unlock_irqrestore(&core->task_queue_lock,
 317                                                        flags);
 318                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 319                                             "task_queue\n",
 320                                             __FUNCTION__, task);
 321                                 return TASK_IS_ABORTED;
 322                         }
 323                 }
 324                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 325         }
 326
 327         for (i = 0; i < 5; i++) {
 328                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 329                 res = si->dft->lldd_abort_task(task);
 330
 331                 spin_lock_irqsave(&task->task_state_lock, flags);
 332                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 333                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 334                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 335                                     task);
 336                         return TASK_IS_DONE;
 337                 }
 338                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 339
 340                 if (res == TMF_RESP_FUNC_COMPLETE) {
 341                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 342                                     __FUNCTION__, task);
 343                         return TASK_IS_ABORTED;
 344                 } else if (si->dft->lldd_query_task) {
 345                         SAS_DPRINTK("%s: querying task 0x%p\n",
 346                                     __FUNCTION__, task);
 347                         res = si->dft->lldd_query_task(task);
 348                         switch (res) {
 349                         case TMF_RESP_FUNC_SUCC:
 350                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 351                                             __FUNCTION__, task);
 352                                 return TASK_IS_AT_LU;
 353                         case TMF_RESP_FUNC_COMPLETE:
 354                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 355                                             __FUNCTION__, task);
 356                                 return TASK_IS_NOT_AT_LU;
 357                         case TMF_RESP_FUNC_FAILED:
 358                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 359                                                 __FUNCTION__, task);
 360                                 return TASK_ABORT_FAILED;
 361                         }
 362
 363                 }
 364         }
 365         return res;
 366 }
 367
 368 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 369 {
 370         int res = TMF_RESP_FUNC_FAILED;
 371         struct scsi_lun lun;
 372         struct sas_internal *i =
 373                 to_sas_internal(dev->port->ha->core.shost->transportt);
 374
 375         int_to_scsilun(cmd->device->lun, &lun);
 376
 377         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 378                     SAS_ADDR(dev->sas_addr),
 379                     cmd->device->lun);
 380
 381         if (i->dft->lldd_abort_task_set)
 382                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 383
 384         if (res == TMF_RESP_FUNC_FAILED) {
 385                 if (i->dft->lldd_clear_task_set)
 386                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 387         }
 388
 389         if (res == TMF_RESP_FUNC_FAILED) {
 390                 if (i->dft->lldd_lu_reset)
 391                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 392         }
 393
 394         return res;
 395 }
 396
 397 static int sas_recover_I_T(struct domain_device *dev)
 398 {
 399         int res = TMF_RESP_FUNC_FAILED;
 400         struct sas_internal *i =
 401                 to_sas_internal(dev->port->ha->core.shost->transportt);
 402
 403         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 404                     SAS_ADDR(dev->sas_addr));
 405
 406         if (i->dft->lldd_I_T_nexus_reset)
 407                 res = i->dft->lldd_I_T_nexus_reset(dev);
 408
 409         return res;
 410 }
 411
 412 /* Find the sas_phy that's attached to this device */
 413 struct sas_phy *find_local_sas_phy(struct domain_device *dev)
 414 {
 415         struct domain_device *pdev = dev->parent;
 416         struct ex_phy *exphy = NULL;
 417         int i;
 418
 419         /* Directly attached device */
 420         if (!pdev)
 421                 return dev->port->phy;
 422
 423         /* Otherwise look in the expander */
 424         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 425                 if (!memcmp(dev->sas_addr,
 426                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 427                             SAS_ADDR_SIZE)) {
 428                         exphy = &pdev->ex_dev.ex_phy[i];
 429                         break;
 430                 }
 431
 432         BUG_ON(!exphy);
 433         return exphy->phy;
 434 }
 435
 436 /* Attempt to send a LUN reset message to a device */
 437 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 438 {
 439         struct domain_device *dev = cmd_to_domain_dev(cmd);
 440         struct sas_internal *i =
 441                 to_sas_internal(dev->port->ha->core.shost->transportt);
 442         struct scsi_lun lun;
 443         int res;
 444
 445         int_to_scsilun(cmd->device->lun, &lun);
 446
 447         if (!i->dft->lldd_lu_reset)
 448                 return FAILED;
 449
 450         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 451         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 452                 return SUCCESS;
 453
 454         return FAILED;
 455 }
 456
 457 /* Attempt to send a phy (bus) reset */
 458 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 459 {
 460         struct domain_device *dev = cmd_to_domain_dev(cmd);
 461         struct sas_phy *phy = find_local_sas_phy(dev);
 462         int res;
 463
 464         res = sas_phy_reset(phy, 1);
 465         if (res)
 466                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 467                             phy->dev.kobj.k_name,
 468                             res);
 469         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 470                 return SUCCESS;
 471
 472         return FAILED;
 473 }
 474
 475 /* Try to reset a device */
 476 static int try_to_reset_cmd_device(struct Scsi_Host *shost,
 477                                    struct scsi_cmnd *cmd)
 478 {
 479         int res;
 480
 481         if (!shost->hostt->eh_device_reset_handler)
 482                 goto try_bus_reset;
 483
 484         res = shost->hostt->eh_device_reset_handler(cmd);
 485         if (res == SUCCESS)
 486                 return res;
 487
 488 try_bus_reset:
 489         if (shost->hostt->eh_bus_reset_handler)
 490                 return shost->hostt->eh_bus_reset_handler(cmd);
 491
 492         return FAILED;
 493 }
 494
 495 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 496                                     struct list_head *work_q,
 497                                     struct list_head *done_q)
 498 {
 499         struct scsi_cmnd *cmd, *n;
 500         enum task_disposition res = TASK_IS_DONE;
 501         int tmf_resp, need_reset;
 502         struct sas_internal *i = to_sas_internal(shost->transportt);
 503         unsigned long flags;
 504         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 505
 506 Again:
 507         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 508                 struct sas_task *task = TO_SAS_TASK(cmd);
 509
 510                 if (!task)
 511                         continue;
 512
 513                 list_del_init(&cmd->eh_entry);
 514
 515                 spin_lock_irqsave(&task->task_state_lock, flags);
 516                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 517                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 518
 519                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 520                 res = sas_scsi_find_task(task);
 521
 522                 cmd->eh_eflags = 0;
 523
 524                 switch (res) {
 525                 case TASK_IS_DONE:
 526                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 527                                     task);
 528                         task->task_done(task);
 529                         if (need_reset)
 530                                 try_to_reset_cmd_device(shost, cmd);
 531                         continue;
 532                 case TASK_IS_ABORTED:
 533                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 534                                     __FUNCTION__, task);
 535                         task->task_done(task);
 536                         if (need_reset)
 537                                 try_to_reset_cmd_device(shost, cmd);
 538                         continue;
 539                 case TASK_IS_AT_LU:
 540                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 541                         tmf_resp = sas_recover_lu(task->dev, cmd);
 542                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 543                                 SAS_DPRINTK("dev %016llx LU %x is "
 544                                             "recovered\n",
 545                                             SAS_ADDR(task->dev),
 546                                             cmd->device->lun);
 547                                 task->task_done(task);
 548                                 if (need_reset)
 549                                         try_to_reset_cmd_device(shost, cmd);
 550                                 sas_scsi_clear_queue_lu(work_q, cmd);
 551                                 goto Again;
 552                         }
 553                         /* fallthrough */
 554                 case TASK_IS_NOT_AT_LU:
 555                 case TASK_ABORT_FAILED:
 556                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 557                                     task);
 558                         tmf_resp = sas_recover_I_T(task->dev);
 559                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 560                                 SAS_DPRINTK("I_T %016llx recovered\n",
 561                                             SAS_ADDR(task->dev->sas_addr));
 562                                 task->task_done(task);
 563                                 if (need_reset)
 564                                         try_to_reset_cmd_device(shost, cmd);
 565                                 sas_scsi_clear_queue_I_T(work_q, task->dev);
 566                                 goto Again;
 567                         }
 568                         /* Hammer time :-) */
 569                         if (i->dft->lldd_clear_nexus_port) {
 570                                 struct asd_sas_port *port = task->dev->port;
 571                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 572                                             port->id);
 573                                 res = i->dft->lldd_clear_nexus_port(port);
 574                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 575                                         SAS_DPRINTK("clear nexus port:%d "
 576                                                     "succeeded\n", port->id);
 577                                         task->task_done(task);
 578                                         if (need_reset)
 579                                                 try_to_reset_cmd_device(shost, cmd);
 580                                         sas_scsi_clear_queue_port(work_q,
 581                                                                   port);
 582                                         goto Again;
 583                                 }
 584                         }
 585                         if (i->dft->lldd_clear_nexus_ha) {
 586                                 SAS_DPRINTK("clear nexus ha\n");
 587                                 res = i->dft->lldd_clear_nexus_ha(ha);
 588                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 589                                         SAS_DPRINTK("clear nexus ha "
 590                                                     "succeeded\n");
 591                                         task->task_done(task);
 592                                         if (need_reset)
 593                                                 try_to_reset_cmd_device(shost, cmd);
 594                                         goto out;
 595                                 }
 596                         }
 597                         /* If we are here -- this means that no amount
 598                          * of effort could recover from errors.  Quite
 599                          * possibly the HA just disappeared.
 600                          */
 601                         SAS_DPRINTK("error from  device %llx, LUN %x "
 602                                     "couldn't be recovered in any way\n",
 603                                     SAS_ADDR(task->dev->sas_addr),
 604                                     cmd->device->lun);
 605
 606                         task->task_done(task);
 607                         if (need_reset)
 608                                 try_to_reset_cmd_device(shost, cmd);
 609                         goto clear_q;
 610                 }
 611         }
 612 out:
 613         return list_empty(work_q);
 614 clear_q:
 615         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 616         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 617                 struct sas_task *task = TO_SAS_TASK(cmd);
 618                 list_del_init(&cmd->eh_entry);
 619                 task->task_done(task);
 620         }
 621         return list_empty(work_q);
 622 }
 623
 624 void sas_scsi_recover_host(struct Scsi_Host *shost)
 625 {
 626         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 627         unsigned long flags;
 628         LIST_HEAD(eh_work_q);
 629
 630         spin_lock_irqsave(shost->host_lock, flags);
 631         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 632         spin_unlock_irqrestore(shost->host_lock, flags);
 633
 634         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 635         /*
 636          * Deal with commands that still have SAS tasks (i.e. they didn't
 637          * complete via the normal sas_task completion mechanism)
 638          */
 639         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 640                 goto out;
 641
 642         /*
 643          * Now deal with SCSI commands that completed ok but have a an error
 644          * code (and hopefully sense data) attached.  This is roughly what
 645          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 646          * command we see here has no sas_task and is thus unknown to the HA.
 647          */
 648         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 649                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 650
 651 out:
 652         scsi_eh_flush_done_q(&ha->eh_done_q);
 653         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 654         return;
 655 }
 656
 657 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 658 {
 659         struct sas_task *task = TO_SAS_TASK(cmd);
 660         unsigned long flags;
 661
 662         if (!task) {
 663                 cmd->timeout_per_command /= 2;
 664                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 665                             cmd, task, (cmd->timeout_per_command ?
 666                             "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
 667                 if (!cmd->timeout_per_command)
 668                         return EH_NOT_HANDLED;
 669                 return EH_RESET_TIMER;
 670         }
 671
 672         spin_lock_irqsave(&task->task_state_lock, flags);
 673         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 674         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 675                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 676                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 677                             cmd, task);
 678                 return EH_HANDLED;
 679         }
 680         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 681                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 682                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 683                             "EH_RESET_TIMER\n",
 684                             cmd, task);
 685                 return EH_RESET_TIMER;
 686         }
 687         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 688         spin_unlock_irqrestore(&task->task_state_lock, flags);
 689
 690         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 691                     cmd, task);
 692
 693         return EH_NOT_HANDLED;
 694 }
 695
 696 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 697 {
 698         struct domain_device *dev = sdev_to_domain_dev(sdev);
 699
 700         if (dev_is_sata(dev))
 701                 return ata_scsi_ioctl(sdev, cmd, arg);
 702
 703         return -EINVAL;
 704 }
 705
 706 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 707 {
 708         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 709         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 710         struct domain_device *found_dev = NULL;
 711         int i;
 712         unsigned long flags;
 713
 714         spin_lock_irqsave(&ha->phy_port_lock, flags);
 715         for (i = 0; i < ha->num_phys; i++) {
 716                 struct asd_sas_port *port = ha->sas_port[i];
 717                 struct domain_device *dev;
 718
 719                 spin_lock(&port->dev_list_lock);
 720                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 721                         if (rphy == dev->rphy) {
 722                                 found_dev = dev;
 723                                 spin_unlock(&port->dev_list_lock);
 724                                 goto found;
 725                         }
 726                 }
 727                 spin_unlock(&port->dev_list_lock);
 728         }
 729  found:
 730         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 731
 732         return found_dev;
 733 }
 734
 735 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 736 {
 737         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 738
 739         return sas_find_dev_by_rphy(rphy);
 740 }
 741
 742 int sas_target_alloc(struct scsi_target *starget)
 743 {
 744         struct domain_device *found_dev = sas_find_target(starget);
 745         int res;
 746
 747         if (!found_dev)
 748                 return -ENODEV;
 749
 750         if (dev_is_sata(found_dev)) {
 751                 res = sas_ata_init_host_and_port(found_dev, starget);
 752                 if (res)
 753                         return res;
 754         }
 755
 756         starget->hostdata = found_dev;
 757         return 0;
 758 }
 759
 760 #define SAS_DEF_QD 32
 761 #define SAS_MAX_QD 64
 762
 763 int sas_slave_configure(struct scsi_device *scsi_dev)
 764 {
 765         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 766         struct sas_ha_struct *sas_ha;
 767
 768         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 769
 770         if (dev_is_sata(dev)) {
 771                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 772                 return 0;
 773         }
 774
 775         sas_ha = dev->port->ha;
 776
 777         sas_read_port_mode_page(scsi_dev);
 778
 779         if (scsi_dev->tagged_supported) {
 780                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 781                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 782         } else {
 783                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 784                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 785                             scsi_dev->lun);
 786                 scsi_dev->tagged_supported = 0;
 787                 scsi_set_tag_type(scsi_dev, 0);
 788                 scsi_deactivate_tcq(scsi_dev, 1);
 789         }
 790
 791         scsi_dev->allow_restart = 1;
 792
 793         return 0;
 794 }
 795
 796 void sas_slave_destroy(struct scsi_device *scsi_dev)
 797 {
 798         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 799
 800         if (dev_is_sata(dev))
 801                 ata_port_disable(dev->sata_dev.ap);
 802 }
 803
 804 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
 805 {
 806         int res = min(new_depth, SAS_MAX_QD);
 807
 808         if (scsi_dev->tagged_supported)
 809                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 810                                         res);
 811         else {
 812                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 813                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 814                            SAS_ADDR(dev->sas_addr),
 815                            scsi_dev->lun);
 816                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 817                 res = 1;
 818         }
 819
 820         return res;
 821 }
 822
 823 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 824 {
 825         if (!scsi_dev->tagged_supported)
 826                 return 0;
 827
 828         scsi_deactivate_tcq(scsi_dev, 1);
 829
 830         scsi_set_tag_type(scsi_dev, qt);
 831         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 832
 833         return qt;
 834 }
 835
 836 int sas_bios_param(struct scsi_device *scsi_dev,
 837                           struct block_device *bdev,
 838                           sector_t capacity, int *hsc)
 839 {
 840         hsc[0] = 255;
 841         hsc[1] = 63;
 842         sector_div(capacity, 255*63);
 843         hsc[2] = capacity;
 844
 845         return 0;
 846 }
 847
 848 /* ---------- Task Collector Thread implementation ---------- */
 849
 850 static void sas_queue(struct sas_ha_struct *sas_ha)
 851 {
 852         struct scsi_core *core = &sas_ha->core;
 853         unsigned long flags;
 854         LIST_HEAD(q);
 855         int can_queue;
 856         int res;
 857         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 858
 859         spin_lock_irqsave(&core->task_queue_lock, flags);
 860         while (!kthread_should_stop() &&
 861                !list_empty(&core->task_queue)) {
 862
 863                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 864                 if (can_queue >= 0) {
 865                         can_queue = core->task_queue_size;
 866                         list_splice_init(&core->task_queue, &q);
 867                 } else {
 868                         struct list_head *a, *n;
 869
 870                         can_queue = sas_ha->lldd_queue_size;
 871                         list_for_each_safe(a, n, &core->task_queue) {
 872                                 list_move_tail(a, &q);
 873                                 if (--can_queue == 0)
 874                                         break;
 875                         }
 876                         can_queue = sas_ha->lldd_queue_size;
 877                 }
 878                 core->task_queue_size -= can_queue;
 879                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 880                 {
 881                         struct sas_task *task = list_entry(q.next,
 882                                                            struct sas_task,
 883                                                            list);
 884                         list_del_init(&q);
 885                         res = i->dft->lldd_execute_task(task, can_queue,
 886                                                         GFP_KERNEL);
 887                         if (unlikely(res))
 888                                 __list_add(&q, task->list.prev, &task->list);
 889                 }
 890                 spin_lock_irqsave(&core->task_queue_lock, flags);
 891                 if (res) {
 892                         list_splice_init(&q, &core->task_queue); /*at head*/
 893                         core->task_queue_size += can_queue;
 894                 }
 895         }
 896         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 897 }
 898
 899 /**
 900  * sas_queue_thread -- The Task Collector thread
 901  * @_sas_ha: pointer to struct sas_ha
 902  */
 903 static int sas_queue_thread(void *_sas_ha)
 904 {
 905         struct sas_ha_struct *sas_ha = _sas_ha;
 906
 907         while (1) {
 908                 set_current_state(TASK_INTERRUPTIBLE);
 909                 schedule();
 910                 sas_queue(sas_ha);
 911                 if (kthread_should_stop())
 912                         break;
 913         }
 914
 915         return 0;
 916 }
 917
 918 int sas_init_queue(struct sas_ha_struct *sas_ha)
 919 {
 920         struct scsi_core *core = &sas_ha->core;
 921
 922         spin_lock_init(&core->task_queue_lock);
 923         core->task_queue_size = 0;
 924         INIT_LIST_HEAD(&core->task_queue);
 925
 926         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 927                                          "sas_queue_%d", core->shost->host_no);
 928         if (IS_ERR(core->queue_thread))
 929                 return PTR_ERR(core->queue_thread);
 930         return 0;
 931 }
 932
 933 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 934 {
 935         unsigned long flags;
 936         struct scsi_core *core = &sas_ha->core;
 937         struct sas_task *task, *n;
 938
 939         kthread_stop(core->queue_thread);
 940
 941         if (!list_empty(&core->task_queue))
 942                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 943                             SAS_ADDR(sas_ha->sas_addr));
 944
 945         spin_lock_irqsave(&core->task_queue_lock, flags);
 946         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 947                 struct scsi_cmnd *cmd = task->uldd_task;
 948
 949                 list_del_init(&task->list);
 950
 951                 ASSIGN_SAS_TASK(cmd, NULL);
 952                 sas_free_task(task);
 953                 cmd->result = DID_ABORT << 16;
 954                 cmd->scsi_done(cmd);
 955         }
 956         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 957 }
 958
 959 /*
 960  * Call the LLDD task abort routine directly.  This function is intended for
 961  * use by upper layers that need to tell the LLDD to abort a task.
 962  */
 963 int __sas_task_abort(struct sas_task *task)
 964 {
 965         struct sas_internal *si =
 966                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 967         unsigned long flags;
 968         int res;
 969
 970         spin_lock_irqsave(&task->task_state_lock, flags);
 971         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 972             task->task_state_flags & SAS_TASK_STATE_DONE) {
 973                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 974                 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
 975                             task);
 976                 return 0;
 977         }
 978         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 979         spin_unlock_irqrestore(&task->task_state_lock, flags);
 980
 981         if (!si->dft->lldd_abort_task)
 982                 return -ENODEV;
 983
 984         res = si->dft->lldd_abort_task(task);
 985
 986         spin_lock_irqsave(&task->task_state_lock, flags);
 987         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
 988             (res == TMF_RESP_FUNC_COMPLETE))
 989         {
 990                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 991                 task->task_done(task);
 992                 return 0;
 993         }
 994
 995         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 996                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 997         spin_unlock_irqrestore(&task->task_state_lock, flags);
 998
 999         return -EAGAIN;
1000 }
1001
1002 /*
1003  * Tell an upper layer that it needs to initiate an abort for a given task.
1004  * This should only ever be called by an LLDD.
1005  */
1006 void sas_task_abort(struct sas_task *task)
1007 {
1008         struct scsi_cmnd *sc = task->uldd_task;
1009
1010         /* Escape for libsas internal commands */
1011         if (!sc) {
1012                 if (!del_timer(&task->timer))
1013                         return;
1014                 task->timer.function(task->timer.data);
1015                 return;
1016         }
1017
1018         if (dev_is_sata(task->dev)) {
1019                 sas_ata_task_abort(task);
1020                 return;
1021         }
1022
1023         scsi_req_abort_cmd(sc);
1024         scsi_schedule_eh(sc->device->host);
1025 }
1026
1027 int sas_slave_alloc(struct scsi_device *scsi_dev)
1028 {
1029         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1030
1031         if (dev_is_sata(dev))
1032                 return ata_sas_port_init(dev->sata_dev.ap);
1033
1034         return 0;
1035 }
1036
1037 void sas_target_destroy(struct scsi_target *starget)
1038 {
1039         struct domain_device *found_dev = sas_find_target(starget);
1040
1041         if (!found_dev)
1042                 return;
1043
1044         if (dev_is_sata(found_dev))
1045                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1046
1047         return;
1048 }
1049
1050 EXPORT_SYMBOL_GPL(sas_queuecommand);
1051 EXPORT_SYMBOL_GPL(sas_target_alloc);
1052 EXPORT_SYMBOL_GPL(sas_slave_configure);
1053 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1054 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1055 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1056 EXPORT_SYMBOL_GPL(sas_bios_param);
1057 EXPORT_SYMBOL_GPL(__sas_task_abort);
1058 EXPORT_SYMBOL_GPL(sas_task_abort);
1059 EXPORT_SYMBOL_GPL(sas_phy_reset);
1060 EXPORT_SYMBOL_GPL(sas_phy_enable);
1061 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1062 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1063 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1064 EXPORT_SYMBOL_GPL(sas_target_destroy);
1065 EXPORT_SYMBOL_GPL(sas_ioctl);