err.no 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         *(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         __releases(host->host_lock)
 204         __acquires(dev->sata_dev.ap->lock)
 205         __releases(dev->sata_dev.ap->lock)
 206         __acquires(host->host_lock)
 207 {
 208         int res = 0;
 209         struct domain_device *dev = cmd_to_domain_dev(cmd);
 210         struct Scsi_Host *host = cmd->device->host;
 211         struct sas_internal *i = to_sas_internal(host->transportt);
 212
 213         spin_unlock_irq(host->host_lock);
 214
 215         {
 216                 struct sas_ha_struct *sas_ha = dev->port->ha;
 217                 struct sas_task *task;
 218
 219                 if (dev_is_sata(dev)) {
 220                         unsigned long flags;
 221
 222                         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 223                         res = ata_sas_queuecmd(cmd, scsi_done,
 224                                                dev->sata_dev.ap);
 225                         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 226                         goto out;
 227                 }
 228
 229                 res = -ENOMEM;
 230                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
 231                 if (!task)
 232                         goto out;
 233
 234                 cmd->scsi_done = scsi_done;
 235                 /* Queue up, Direct Mode or Task Collector Mode. */
 236                 if (sas_ha->lldd_max_execute_num < 2)
 237                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 238                 else
 239                         res = sas_queue_up(task);
 240
 241                 /* Examine */
 242                 if (res) {
 243                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 244                         ASSIGN_SAS_TASK(cmd, NULL);
 245                         sas_free_task(task);
 246                         if (res == -SAS_QUEUE_FULL) {
 247                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 248                                 res = 0;
 249                                 scsi_done(cmd);
 250                         }
 251                         goto out;
 252                 }
 253         }
 254 out:
 255         spin_lock_irq(host->host_lock);
 256         return res;
 257 }
 258
 259 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 260 {
 261         struct scsi_cmnd *cmd, *n;
 262
 263         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 264                 if (cmd == my_cmd)
 265                         list_del_init(&cmd->eh_entry);
 266         }
 267 }
 268
 269 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 270                                      struct domain_device *dev)
 271 {
 272         struct scsi_cmnd *cmd, *n;
 273
 274         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 275                 struct domain_device *x = cmd_to_domain_dev(cmd);
 276
 277                 if (x == dev)
 278                         list_del_init(&cmd->eh_entry);
 279         }
 280 }
 281
 282 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 283                                       struct asd_sas_port *port)
 284 {
 285         struct scsi_cmnd *cmd, *n;
 286
 287         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 288                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 289                 struct asd_sas_port *x = dev->port;
 290
 291                 if (x == port)
 292                         list_del_init(&cmd->eh_entry);
 293         }
 294 }
 295
 296 enum task_disposition {
 297         TASK_IS_DONE,
 298         TASK_IS_ABORTED,
 299         TASK_IS_AT_LU,
 300         TASK_IS_NOT_AT_LU,
 301         TASK_ABORT_FAILED,
 302 };
 303
 304 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 305 {
 306         struct sas_ha_struct *ha = task->dev->port->ha;
 307         unsigned long flags;
 308         int i, res;
 309         struct sas_internal *si =
 310                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 311
 312         if (ha->lldd_max_execute_num > 1) {
 313                 struct scsi_core *core = &ha->core;
 314                 struct sas_task *t, *n;
 315
 316                 spin_lock_irqsave(&core->task_queue_lock, flags);
 317                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 318                         if (task == t) {
 319                                 list_del_init(&t->list);
 320                                 spin_unlock_irqrestore(&core->task_queue_lock,
 321                                                        flags);
 322                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 323                                             "task_queue\n",
 324                                             __FUNCTION__, task);
 325                                 return TASK_IS_ABORTED;
 326                         }
 327                 }
 328                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 329         }
 330
 331         for (i = 0; i < 5; i++) {
 332                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 333                 res = si->dft->lldd_abort_task(task);
 334
 335                 spin_lock_irqsave(&task->task_state_lock, flags);
 336                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 337                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 338                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 339                                     task);
 340                         return TASK_IS_DONE;
 341                 }
 342                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 343
 344                 if (res == TMF_RESP_FUNC_COMPLETE) {
 345                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 346                                     __FUNCTION__, task);
 347                         return TASK_IS_ABORTED;
 348                 } else if (si->dft->lldd_query_task) {
 349                         SAS_DPRINTK("%s: querying task 0x%p\n",
 350                                     __FUNCTION__, task);
 351                         res = si->dft->lldd_query_task(task);
 352                         switch (res) {
 353                         case TMF_RESP_FUNC_SUCC:
 354                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 355                                             __FUNCTION__, task);
 356                                 return TASK_IS_AT_LU;
 357                         case TMF_RESP_FUNC_COMPLETE:
 358                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 359                                             __FUNCTION__, task);
 360                                 return TASK_IS_NOT_AT_LU;
 361                         case TMF_RESP_FUNC_FAILED:
 362                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 363                                                 __FUNCTION__, task);
 364                                 return TASK_ABORT_FAILED;
 365                         }
 366
 367                 }
 368         }
 369         return res;
 370 }
 371
 372 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 373 {
 374         int res = TMF_RESP_FUNC_FAILED;
 375         struct scsi_lun lun;
 376         struct sas_internal *i =
 377                 to_sas_internal(dev->port->ha->core.shost->transportt);
 378
 379         int_to_scsilun(cmd->device->lun, &lun);
 380
 381         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 382                     SAS_ADDR(dev->sas_addr),
 383                     cmd->device->lun);
 384
 385         if (i->dft->lldd_abort_task_set)
 386                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 387
 388         if (res == TMF_RESP_FUNC_FAILED) {
 389                 if (i->dft->lldd_clear_task_set)
 390                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 391         }
 392
 393         if (res == TMF_RESP_FUNC_FAILED) {
 394                 if (i->dft->lldd_lu_reset)
 395                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 396         }
 397
 398         return res;
 399 }
 400
 401 static int sas_recover_I_T(struct domain_device *dev)
 402 {
 403         int res = TMF_RESP_FUNC_FAILED;
 404         struct sas_internal *i =
 405                 to_sas_internal(dev->port->ha->core.shost->transportt);
 406
 407         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 408                     SAS_ADDR(dev->sas_addr));
 409
 410         if (i->dft->lldd_I_T_nexus_reset)
 411                 res = i->dft->lldd_I_T_nexus_reset(dev);
 412
 413         return res;
 414 }
 415
 416 /* Find the sas_phy that's attached to this device */
 417 static struct sas_phy *find_local_sas_phy(struct domain_device *dev)
 418 {
 419         struct domain_device *pdev = dev->parent;
 420         struct ex_phy *exphy = NULL;
 421         int i;
 422
 423         /* Directly attached device */
 424         if (!pdev)
 425                 return dev->port->phy;
 426
 427         /* Otherwise look in the expander */
 428         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 429                 if (!memcmp(dev->sas_addr,
 430                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 431                             SAS_ADDR_SIZE)) {
 432                         exphy = &pdev->ex_dev.ex_phy[i];
 433                         break;
 434                 }
 435
 436         BUG_ON(!exphy);
 437         return exphy->phy;
 438 }
 439
 440 /* Attempt to send a LUN reset message to a device */
 441 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 442 {
 443         struct domain_device *dev = cmd_to_domain_dev(cmd);
 444         struct sas_internal *i =
 445                 to_sas_internal(dev->port->ha->core.shost->transportt);
 446         struct scsi_lun lun;
 447         int res;
 448
 449         int_to_scsilun(cmd->device->lun, &lun);
 450
 451         if (!i->dft->lldd_lu_reset)
 452                 return FAILED;
 453
 454         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 455         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 456                 return SUCCESS;
 457
 458         return FAILED;
 459 }
 460
 461 /* Attempt to send a phy (bus) reset */
 462 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 463 {
 464         struct domain_device *dev = cmd_to_domain_dev(cmd);
 465         struct sas_phy *phy = find_local_sas_phy(dev);
 466         int res;
 467
 468         res = sas_phy_reset(phy, 1);
 469         if (res)
 470                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 471                             phy->dev.kobj.k_name,
 472                             res);
 473         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 474                 return SUCCESS;
 475
 476         return FAILED;
 477 }
 478
 479 /* Try to reset a device */
 480 static int try_to_reset_cmd_device(struct Scsi_Host *shost,
 481                                    struct scsi_cmnd *cmd)
 482 {
 483         int res;
 484
 485         if (!shost->hostt->eh_device_reset_handler)
 486                 goto try_bus_reset;
 487
 488         res = shost->hostt->eh_device_reset_handler(cmd);
 489         if (res == SUCCESS)
 490                 return res;
 491
 492 try_bus_reset:
 493         if (shost->hostt->eh_bus_reset_handler)
 494                 return shost->hostt->eh_bus_reset_handler(cmd);
 495
 496         return FAILED;
 497 }
 498
 499 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 500                                     struct list_head *work_q,
 501                                     struct list_head *done_q)
 502 {
 503         struct scsi_cmnd *cmd, *n;
 504         enum task_disposition res = TASK_IS_DONE;
 505         int tmf_resp, need_reset;
 506         struct sas_internal *i = to_sas_internal(shost->transportt);
 507         unsigned long flags;
 508         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 509
 510 Again:
 511         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 512                 struct sas_task *task = TO_SAS_TASK(cmd);
 513
 514                 if (!task)
 515                         continue;
 516
 517                 list_del_init(&cmd->eh_entry);
 518
 519                 spin_lock_irqsave(&task->task_state_lock, flags);
 520                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 521                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 522
 523                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 524                 res = sas_scsi_find_task(task);
 525
 526                 cmd->eh_eflags = 0;
 527
 528                 switch (res) {
 529                 case TASK_IS_DONE:
 530                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 531                                     task);
 532                         task->task_done(task);
 533                         if (need_reset)
 534                                 try_to_reset_cmd_device(shost, cmd);
 535                         continue;
 536                 case TASK_IS_ABORTED:
 537                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 538                                     __FUNCTION__, task);
 539                         task->task_done(task);
 540                         if (need_reset)
 541                                 try_to_reset_cmd_device(shost, cmd);
 542                         continue;
 543                 case TASK_IS_AT_LU:
 544                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 545                         tmf_resp = sas_recover_lu(task->dev, cmd);
 546                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 547                                 SAS_DPRINTK("dev %016llx LU %x is "
 548                                             "recovered\n",
 549                                             SAS_ADDR(task->dev),
 550                                             cmd->device->lun);
 551                                 task->task_done(task);
 552                                 if (need_reset)
 553                                         try_to_reset_cmd_device(shost, cmd);
 554                                 sas_scsi_clear_queue_lu(work_q, cmd);
 555                                 goto Again;
 556                         }
 557                         /* fallthrough */
 558                 case TASK_IS_NOT_AT_LU:
 559                 case TASK_ABORT_FAILED:
 560                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 561                                     task);
 562                         tmf_resp = sas_recover_I_T(task->dev);
 563                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 564                                 SAS_DPRINTK("I_T %016llx recovered\n",
 565                                             SAS_ADDR(task->dev->sas_addr));
 566                                 task->task_done(task);
 567                                 if (need_reset)
 568                                         try_to_reset_cmd_device(shost, cmd);
 569                                 sas_scsi_clear_queue_I_T(work_q, task->dev);
 570                                 goto Again;
 571                         }
 572                         /* Hammer time :-) */
 573                         if (i->dft->lldd_clear_nexus_port) {
 574                                 struct asd_sas_port *port = task->dev->port;
 575                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 576                                             port->id);
 577                                 res = i->dft->lldd_clear_nexus_port(port);
 578                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 579                                         SAS_DPRINTK("clear nexus port:%d "
 580                                                     "succeeded\n", port->id);
 581                                         task->task_done(task);
 582                                         if (need_reset)
 583                                                 try_to_reset_cmd_device(shost, cmd);
 584                                         sas_scsi_clear_queue_port(work_q,
 585                                                                   port);
 586                                         goto Again;
 587                                 }
 588                         }
 589                         if (i->dft->lldd_clear_nexus_ha) {
 590                                 SAS_DPRINTK("clear nexus ha\n");
 591                                 res = i->dft->lldd_clear_nexus_ha(ha);
 592                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 593                                         SAS_DPRINTK("clear nexus ha "
 594                                                     "succeeded\n");
 595                                         task->task_done(task);
 596                                         if (need_reset)
 597                                                 try_to_reset_cmd_device(shost, cmd);
 598                                         goto out;
 599                                 }
 600                         }
 601                         /* If we are here -- this means that no amount
 602                          * of effort could recover from errors.  Quite
 603                          * possibly the HA just disappeared.
 604                          */
 605                         SAS_DPRINTK("error from  device %llx, LUN %x "
 606                                     "couldn't be recovered in any way\n",
 607                                     SAS_ADDR(task->dev->sas_addr),
 608                                     cmd->device->lun);
 609
 610                         task->task_done(task);
 611                         if (need_reset)
 612                                 try_to_reset_cmd_device(shost, cmd);
 613                         goto clear_q;
 614                 }
 615         }
 616 out:
 617         return list_empty(work_q);
 618 clear_q:
 619         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 620         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 621                 struct sas_task *task = TO_SAS_TASK(cmd);
 622                 list_del_init(&cmd->eh_entry);
 623                 task->task_done(task);
 624         }
 625         return list_empty(work_q);
 626 }
 627
 628 void sas_scsi_recover_host(struct Scsi_Host *shost)
 629 {
 630         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 631         unsigned long flags;
 632         LIST_HEAD(eh_work_q);
 633
 634         spin_lock_irqsave(shost->host_lock, flags);
 635         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 636         spin_unlock_irqrestore(shost->host_lock, flags);
 637
 638         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 639         /*
 640          * Deal with commands that still have SAS tasks (i.e. they didn't
 641          * complete via the normal sas_task completion mechanism)
 642          */
 643         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 644                 goto out;
 645
 646         /*
 647          * Now deal with SCSI commands that completed ok but have a an error
 648          * code (and hopefully sense data) attached.  This is roughly what
 649          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 650          * command we see here has no sas_task and is thus unknown to the HA.
 651          */
 652         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 653                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 654
 655 out:
 656         scsi_eh_flush_done_q(&ha->eh_done_q);
 657         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 658         return;
 659 }
 660
 661 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 662 {
 663         struct sas_task *task = TO_SAS_TASK(cmd);
 664         unsigned long flags;
 665
 666         if (!task) {
 667                 cmd->timeout_per_command /= 2;
 668                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 669                             cmd, task, (cmd->timeout_per_command ?
 670                             "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
 671                 if (!cmd->timeout_per_command)
 672                         return EH_NOT_HANDLED;
 673                 return EH_RESET_TIMER;
 674         }
 675
 676         spin_lock_irqsave(&task->task_state_lock, flags);
 677         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 678         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 679                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 680                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 681                             cmd, task);
 682                 return EH_HANDLED;
 683         }
 684         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 685                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 686                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 687                             "EH_RESET_TIMER\n",
 688                             cmd, task);
 689                 return EH_RESET_TIMER;
 690         }
 691         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 692         spin_unlock_irqrestore(&task->task_state_lock, flags);
 693
 694         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 695                     cmd, task);
 696
 697         return EH_NOT_HANDLED;
 698 }
 699
 700 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 701 {
 702         struct domain_device *dev = sdev_to_domain_dev(sdev);
 703
 704         if (dev_is_sata(dev))
 705                 return ata_scsi_ioctl(sdev, cmd, arg);
 706
 707         return -EINVAL;
 708 }
 709
 710 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 711 {
 712         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 713         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 714         struct domain_device *found_dev = NULL;
 715         int i;
 716         unsigned long flags;
 717
 718         spin_lock_irqsave(&ha->phy_port_lock, flags);
 719         for (i = 0; i < ha->num_phys; i++) {
 720                 struct asd_sas_port *port = ha->sas_port[i];
 721                 struct domain_device *dev;
 722
 723                 spin_lock(&port->dev_list_lock);
 724                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 725                         if (rphy == dev->rphy) {
 726                                 found_dev = dev;
 727                                 spin_unlock(&port->dev_list_lock);
 728                                 goto found;
 729                         }
 730                 }
 731                 spin_unlock(&port->dev_list_lock);
 732         }
 733  found:
 734         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 735
 736         return found_dev;
 737 }
 738
 739 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 740 {
 741         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 742
 743         return sas_find_dev_by_rphy(rphy);
 744 }
 745
 746 int sas_target_alloc(struct scsi_target *starget)
 747 {
 748         struct domain_device *found_dev = sas_find_target(starget);
 749         int res;
 750
 751         if (!found_dev)
 752                 return -ENODEV;
 753
 754         if (dev_is_sata(found_dev)) {
 755                 res = sas_ata_init_host_and_port(found_dev, starget);
 756                 if (res)
 757                         return res;
 758         }
 759
 760         starget->hostdata = found_dev;
 761         return 0;
 762 }
 763
 764 #define SAS_DEF_QD 32
 765 #define SAS_MAX_QD 64
 766
 767 int sas_slave_configure(struct scsi_device *scsi_dev)
 768 {
 769         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 770         struct sas_ha_struct *sas_ha;
 771
 772         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 773
 774         if (dev_is_sata(dev)) {
 775                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 776                 return 0;
 777         }
 778
 779         sas_ha = dev->port->ha;
 780
 781         sas_read_port_mode_page(scsi_dev);
 782
 783         if (scsi_dev->tagged_supported) {
 784                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 785                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 786         } else {
 787                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 788                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 789                             scsi_dev->lun);
 790                 scsi_dev->tagged_supported = 0;
 791                 scsi_set_tag_type(scsi_dev, 0);
 792                 scsi_deactivate_tcq(scsi_dev, 1);
 793         }
 794
 795         scsi_dev->allow_restart = 1;
 796
 797         return 0;
 798 }
 799
 800 void sas_slave_destroy(struct scsi_device *scsi_dev)
 801 {
 802         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 803
 804         if (dev_is_sata(dev))
 805                 ata_port_disable(dev->sata_dev.ap);
 806 }
 807
 808 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
 809 {
 810         int res = min(new_depth, SAS_MAX_QD);
 811
 812         if (scsi_dev->tagged_supported)
 813                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 814                                         res);
 815         else {
 816                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 817                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 818                            SAS_ADDR(dev->sas_addr),
 819                            scsi_dev->lun);
 820                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 821                 res = 1;
 822         }
 823
 824         return res;
 825 }
 826
 827 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 828 {
 829         if (!scsi_dev->tagged_supported)
 830                 return 0;
 831
 832         scsi_deactivate_tcq(scsi_dev, 1);
 833
 834         scsi_set_tag_type(scsi_dev, qt);
 835         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 836
 837         return qt;
 838 }
 839
 840 int sas_bios_param(struct scsi_device *scsi_dev,
 841                           struct block_device *bdev,
 842                           sector_t capacity, int *hsc)
 843 {
 844         hsc[0] = 255;
 845         hsc[1] = 63;
 846         sector_div(capacity, 255*63);
 847         hsc[2] = capacity;
 848
 849         return 0;
 850 }
 851
 852 /* ---------- Task Collector Thread implementation ---------- */
 853
 854 static void sas_queue(struct sas_ha_struct *sas_ha)
 855 {
 856         struct scsi_core *core = &sas_ha->core;
 857         unsigned long flags;
 858         LIST_HEAD(q);
 859         int can_queue;
 860         int res;
 861         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 862
 863         spin_lock_irqsave(&core->task_queue_lock, flags);
 864         while (!kthread_should_stop() &&
 865                !list_empty(&core->task_queue)) {
 866
 867                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 868                 if (can_queue >= 0) {
 869                         can_queue = core->task_queue_size;
 870                         list_splice_init(&core->task_queue, &q);
 871                 } else {
 872                         struct list_head *a, *n;
 873
 874                         can_queue = sas_ha->lldd_queue_size;
 875                         list_for_each_safe(a, n, &core->task_queue) {
 876                                 list_move_tail(a, &q);
 877                                 if (--can_queue == 0)
 878                                         break;
 879                         }
 880                         can_queue = sas_ha->lldd_queue_size;
 881                 }
 882                 core->task_queue_size -= can_queue;
 883                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 884                 {
 885                         struct sas_task *task = list_entry(q.next,
 886                                                            struct sas_task,
 887                                                            list);
 888                         list_del_init(&q);
 889                         res = i->dft->lldd_execute_task(task, can_queue,
 890                                                         GFP_KERNEL);
 891                         if (unlikely(res))
 892                                 __list_add(&q, task->list.prev, &task->list);
 893                 }
 894                 spin_lock_irqsave(&core->task_queue_lock, flags);
 895                 if (res) {
 896                         list_splice_init(&q, &core->task_queue); /*at head*/
 897                         core->task_queue_size += can_queue;
 898                 }
 899         }
 900         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 901 }
 902
 903 /**
 904  * sas_queue_thread -- The Task Collector thread
 905  * @_sas_ha: pointer to struct sas_ha
 906  */
 907 static int sas_queue_thread(void *_sas_ha)
 908 {
 909         struct sas_ha_struct *sas_ha = _sas_ha;
 910
 911         while (1) {
 912                 set_current_state(TASK_INTERRUPTIBLE);
 913                 schedule();
 914                 sas_queue(sas_ha);
 915                 if (kthread_should_stop())
 916                         break;
 917         }
 918
 919         return 0;
 920 }
 921
 922 int sas_init_queue(struct sas_ha_struct *sas_ha)
 923 {
 924         struct scsi_core *core = &sas_ha->core;
 925
 926         spin_lock_init(&core->task_queue_lock);
 927         core->task_queue_size = 0;
 928         INIT_LIST_HEAD(&core->task_queue);
 929
 930         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 931                                          "sas_queue_%d", core->shost->host_no);
 932         if (IS_ERR(core->queue_thread))
 933                 return PTR_ERR(core->queue_thread);
 934         return 0;
 935 }
 936
 937 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 938 {
 939         unsigned long flags;
 940         struct scsi_core *core = &sas_ha->core;
 941         struct sas_task *task, *n;
 942
 943         kthread_stop(core->queue_thread);
 944
 945         if (!list_empty(&core->task_queue))
 946                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 947                             SAS_ADDR(sas_ha->sas_addr));
 948
 949         spin_lock_irqsave(&core->task_queue_lock, flags);
 950         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 951                 struct scsi_cmnd *cmd = task->uldd_task;
 952
 953                 list_del_init(&task->list);
 954
 955                 ASSIGN_SAS_TASK(cmd, NULL);
 956                 sas_free_task(task);
 957                 cmd->result = DID_ABORT << 16;
 958                 cmd->scsi_done(cmd);
 959         }
 960         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 961 }
 962
 963 /*
 964  * Call the LLDD task abort routine directly.  This function is intended for
 965  * use by upper layers that need to tell the LLDD to abort a task.
 966  */
 967 int __sas_task_abort(struct sas_task *task)
 968 {
 969         struct sas_internal *si =
 970                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 971         unsigned long flags;
 972         int res;
 973
 974         spin_lock_irqsave(&task->task_state_lock, flags);
 975         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 976             task->task_state_flags & SAS_TASK_STATE_DONE) {
 977                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 978                 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
 979                             task);
 980                 return 0;
 981         }
 982         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 983         spin_unlock_irqrestore(&task->task_state_lock, flags);
 984
 985         if (!si->dft->lldd_abort_task)
 986                 return -ENODEV;
 987
 988         res = si->dft->lldd_abort_task(task);
 989
 990         spin_lock_irqsave(&task->task_state_lock, flags);
 991         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
 992             (res == TMF_RESP_FUNC_COMPLETE))
 993         {
 994                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 995                 task->task_done(task);
 996                 return 0;
 997         }
 998
 999         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1000                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1001         spin_unlock_irqrestore(&task->task_state_lock, flags);
1002
1003         return -EAGAIN;
1004 }
1005
1006 /*
1007  * Tell an upper layer that it needs to initiate an abort for a given task.
1008  * This should only ever be called by an LLDD.
1009  */
1010 void sas_task_abort(struct sas_task *task)
1011 {
1012         struct scsi_cmnd *sc = task->uldd_task;
1013
1014         /* Escape for libsas internal commands */
1015         if (!sc) {
1016                 if (!del_timer(&task->timer))
1017                         return;
1018                 task->timer.function(task->timer.data);
1019                 return;
1020         }
1021
1022         if (dev_is_sata(task->dev)) {
1023                 sas_ata_task_abort(task);
1024                 return;
1025         }
1026
1027         scsi_req_abort_cmd(sc);
1028         scsi_schedule_eh(sc->device->host);
1029 }
1030
1031 int sas_slave_alloc(struct scsi_device *scsi_dev)
1032 {
1033         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1034
1035         if (dev_is_sata(dev))
1036                 return ata_sas_port_init(dev->sata_dev.ap);
1037
1038         return 0;
1039 }
1040
1041 void sas_target_destroy(struct scsi_target *starget)
1042 {
1043         struct domain_device *found_dev = sas_find_target(starget);
1044
1045         if (!found_dev)
1046                 return;
1047
1048         if (dev_is_sata(found_dev))
1049                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1050
1051         return;
1052 }
1053
1054 EXPORT_SYMBOL_GPL(sas_queuecommand);
1055 EXPORT_SYMBOL_GPL(sas_target_alloc);
1056 EXPORT_SYMBOL_GPL(sas_slave_configure);
1057 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1058 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1059 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1060 EXPORT_SYMBOL_GPL(sas_bios_param);
1061 EXPORT_SYMBOL_GPL(__sas_task_abort);
1062 EXPORT_SYMBOL_GPL(sas_task_abort);
1063 EXPORT_SYMBOL_GPL(sas_phy_reset);
1064 EXPORT_SYMBOL_GPL(sas_phy_enable);
1065 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1066 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1067 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1068 EXPORT_SYMBOL_GPL(sas_target_destroy);
1069 EXPORT_SYMBOL_GPL(sas_ioctl);