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 #include <linux/firmware.h>
  28 #include <linux/ctype.h>
  29
  30 #include "sas_internal.h"
  31
  32 #include <scsi/scsi_host.h>
  33 #include <scsi/scsi_device.h>
  34 #include <scsi/scsi_tcq.h>
  35 #include <scsi/scsi.h>
  36 #include <scsi/scsi_eh.h>
  37 #include <scsi/scsi_transport.h>
  38 #include <scsi/scsi_transport_sas.h>
  39 #include <scsi/sas_ata.h>
  40 #include "../scsi_sas_internal.h"
  41 #include "../scsi_transport_api.h"
  42 #include "../scsi_priv.h"
  43
  44 #include <linux/err.h>
  45 #include <linux/blkdev.h>
  46 #include <linux/freezer.h>
  47 #include <linux/gfp.h>
  48 #include <linux/scatterlist.h>
  49 #include <linux/libata.h>
  50
  51 /* ---------- SCSI Host glue ---------- */
  52
  53 static void sas_scsi_task_done(struct sas_task *task)
  54 {
  55         struct task_status_struct *ts = &task->task_status;
  56         struct scsi_cmnd *sc = task->uldd_task;
  57         int hs = 0, stat = 0;
  58
  59         if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
  60                 /* Aborted tasks will be completed by the error handler */
  61                 SAS_DPRINTK("task done but aborted\n");
  62                 return;
  63         }
  64
  65         if (unlikely(!sc)) {
  66                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  67                 list_del_init(&task->list);
  68                 sas_free_task(task);
  69                 return;
  70         }
  71
  72         if (ts->resp == SAS_TASK_UNDELIVERED) {
  73                 /* transport error */
  74                 hs = DID_NO_CONNECT;
  75         } else { /* ts->resp == SAS_TASK_COMPLETE */
  76                 /* task delivered, what happened afterwards? */
  77                 switch (ts->stat) {
  78                 case SAS_DEV_NO_RESPONSE:
  79                 case SAS_INTERRUPTED:
  80                 case SAS_PHY_DOWN:
  81                 case SAS_NAK_R_ERR:
  82                 case SAS_OPEN_TO:
  83                         hs = DID_NO_CONNECT;
  84                         break;
  85                 case SAS_DATA_UNDERRUN:
  86                         scsi_set_resid(sc, ts->residual);
  87                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  88                                 hs = DID_ERROR;
  89                         break;
  90                 case SAS_DATA_OVERRUN:
  91                         hs = DID_ERROR;
  92                         break;
  93                 case SAS_QUEUE_FULL:
  94                         hs = DID_SOFT_ERROR; /* retry */
  95                         break;
  96                 case SAS_DEVICE_UNKNOWN:
  97                         hs = DID_BAD_TARGET;
  98                         break;
  99                 case SAS_SG_ERR:
 100                         hs = DID_PARITY;
 101                         break;
 102                 case SAS_OPEN_REJECT:
 103                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
 104                                 hs = DID_SOFT_ERROR; /* retry */
 105                         else
 106                                 hs = DID_ERROR;
 107                         break;
 108                 case SAS_PROTO_RESPONSE:
 109                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
 110                                     "task; please report this\n",
 111                                     task->dev->port->ha->sas_ha_name);
 112                         break;
 113                 case SAS_ABORTED_TASK:
 114                         hs = DID_ABORT;
 115                         break;
 116                 case SAM_STAT_CHECK_CONDITION:
 117                         memcpy(sc->sense_buffer, ts->buf,
 118                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 119                         stat = SAM_STAT_CHECK_CONDITION;
 120                         break;
 121                 default:
 122                         stat = ts->stat;
 123                         break;
 124                 }
 125         }
 126         ASSIGN_SAS_TASK(sc, NULL);
 127         sc->result = (hs << 16) | stat;
 128         list_del_init(&task->list);
 129         sas_free_task(task);
 130         sc->scsi_done(sc);
 131 }
 132
 133 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 134                                                struct domain_device *dev,
 135                                                gfp_t gfp_flags)
 136 {
 137         struct sas_task *task = sas_alloc_task(gfp_flags);
 138         struct scsi_lun lun;
 139
 140         if (!task)
 141                 return NULL;
 142
 143         task->uldd_task = cmd;
 144         ASSIGN_SAS_TASK(cmd, task);
 145
 146         task->dev = dev;
 147         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 148
 149         task->ssp_task.retry_count = 1;
 150         int_to_scsilun(cmd->device->lun, &lun);
 151         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 152         task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
 153         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 154
 155         task->scatter = scsi_sglist(cmd);
 156         task->num_scatter = scsi_sg_count(cmd);
 157         task->total_xfer_len = scsi_bufflen(cmd);
 158         task->data_dir = cmd->sc_data_direction;
 159
 160         task->task_done = sas_scsi_task_done;
 161
 162         return task;
 163 }
 164
 165 int sas_queue_up(struct sas_task *task)
 166 {
 167         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 168         struct scsi_core *core = &sas_ha->core;
 169         unsigned long flags;
 170         LIST_HEAD(list);
 171
 172         spin_lock_irqsave(&core->task_queue_lock, flags);
 173         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 174                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 175                 return -SAS_QUEUE_FULL;
 176         }
 177         list_add_tail(&task->list, &core->task_queue);
 178         core->task_queue_size += 1;
 179         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 180         wake_up_process(core->queue_thread);
 181
 182         return 0;
 183 }
 184
 185 /**
 186  * sas_queuecommand -- Enqueue a command for processing
 187  * @parameters: See SCSI Core documentation
 188  *
 189  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
 190  * call us without holding an IRQ spinlock...
 191  */
 192 static int sas_queuecommand_lck(struct scsi_cmnd *cmd,
 193                      void (*scsi_done)(struct scsi_cmnd *))
 194         __releases(host->host_lock)
 195         __acquires(dev->sata_dev.ap->lock)
 196         __releases(dev->sata_dev.ap->lock)
 197         __acquires(host->host_lock)
 198 {
 199         int res = 0;
 200         struct domain_device *dev = cmd_to_domain_dev(cmd);
 201         struct Scsi_Host *host = cmd->device->host;
 202         struct sas_internal *i = to_sas_internal(host->transportt);
 203
 204         spin_unlock_irq(host->host_lock);
 205
 206         {
 207                 struct sas_ha_struct *sas_ha = dev->port->ha;
 208                 struct sas_task *task;
 209
 210                 if (dev_is_sata(dev)) {
 211                         unsigned long flags;
 212
 213                         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 214                         res = ata_sas_queuecmd(cmd, scsi_done,
 215                                                dev->sata_dev.ap);
 216                         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 217                         goto out;
 218                 }
 219
 220                 /* If the device fell off, no sense in issuing commands */
 221                 if (dev->gone) {
 222                         cmd->result = DID_BAD_TARGET << 16;
 223                         scsi_done(cmd);
 224                         goto out;
 225                 }
 226
 227                 res = -ENOMEM;
 228                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
 229                 if (!task)
 230                         goto out;
 231
 232                 cmd->scsi_done = scsi_done;
 233                 /* Queue up, Direct Mode or Task Collector Mode. */
 234                 if (sas_ha->lldd_max_execute_num < 2)
 235                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 236                 else
 237                         res = sas_queue_up(task);
 238
 239                 /* Examine */
 240                 if (res) {
 241                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 242                         ASSIGN_SAS_TASK(cmd, NULL);
 243                         sas_free_task(task);
 244                         if (res == -SAS_QUEUE_FULL) {
 245                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 246                                 res = 0;
 247                                 scsi_done(cmd);
 248                         }
 249                         goto out;
 250                 }
 251         }
 252 out:
 253         spin_lock_irq(host->host_lock);
 254         return res;
 255 }
 256
 257 DEF_SCSI_QCMD(sas_queuecommand)
 258
 259 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
 260 {
 261         struct sas_task *task = TO_SAS_TASK(cmd);
 262         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
 263
 264         /* remove the aborted task flag to allow the task to be
 265          * completed now. At this point, we only get called following
 266          * an actual abort of the task, so we should be guaranteed not
 267          * to be racing with any completions from the LLD (hence we
 268          * don't need the task state lock to clear the flag) */
 269         task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 270         /* Now call task_done.  However, task will be free'd after
 271          * this */
 272         task->task_done(task);
 273         /* now finish the command and move it on to the error
 274          * handler done list, this also takes it off the
 275          * error handler pending list */
 276         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
 277 }
 278
 279 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 280 {
 281         struct scsi_cmnd *cmd, *n;
 282
 283         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 284                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
 285                     cmd->device->lun == my_cmd->device->lun)
 286                         sas_eh_finish_cmd(cmd);
 287         }
 288 }
 289
 290 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 291                                      struct domain_device *dev)
 292 {
 293         struct scsi_cmnd *cmd, *n;
 294
 295         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 296                 struct domain_device *x = cmd_to_domain_dev(cmd);
 297
 298                 if (x == dev)
 299                         sas_eh_finish_cmd(cmd);
 300         }
 301 }
 302
 303 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 304                                       struct asd_sas_port *port)
 305 {
 306         struct scsi_cmnd *cmd, *n;
 307
 308         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 309                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 310                 struct asd_sas_port *x = dev->port;
 311
 312                 if (x == port)
 313                         sas_eh_finish_cmd(cmd);
 314         }
 315 }
 316
 317 enum task_disposition {
 318         TASK_IS_DONE,
 319         TASK_IS_ABORTED,
 320         TASK_IS_AT_LU,
 321         TASK_IS_NOT_AT_LU,
 322         TASK_ABORT_FAILED,
 323 };
 324
 325 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 326 {
 327         struct sas_ha_struct *ha = task->dev->port->ha;
 328         unsigned long flags;
 329         int i, res;
 330         struct sas_internal *si =
 331                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 332
 333         if (ha->lldd_max_execute_num > 1) {
 334                 struct scsi_core *core = &ha->core;
 335                 struct sas_task *t, *n;
 336
 337                 spin_lock_irqsave(&core->task_queue_lock, flags);
 338                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 339                         if (task == t) {
 340                                 list_del_init(&t->list);
 341                                 spin_unlock_irqrestore(&core->task_queue_lock,
 342                                                        flags);
 343                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 344                                             "task_queue\n",
 345                                             __func__, task);
 346                                 return TASK_IS_ABORTED;
 347                         }
 348                 }
 349                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 350         }
 351
 352         for (i = 0; i < 5; i++) {
 353                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
 354                 res = si->dft->lldd_abort_task(task);
 355
 356                 spin_lock_irqsave(&task->task_state_lock, flags);
 357                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 358                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 359                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 360                                     task);
 361                         return TASK_IS_DONE;
 362                 }
 363                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 364
 365                 if (res == TMF_RESP_FUNC_COMPLETE) {
 366                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 367                                     __func__, task);
 368                         return TASK_IS_ABORTED;
 369                 } else if (si->dft->lldd_query_task) {
 370                         SAS_DPRINTK("%s: querying task 0x%p\n",
 371                                     __func__, task);
 372                         res = si->dft->lldd_query_task(task);
 373                         switch (res) {
 374                         case TMF_RESP_FUNC_SUCC:
 375                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 376                                             __func__, task);
 377                                 return TASK_IS_AT_LU;
 378                         case TMF_RESP_FUNC_COMPLETE:
 379                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 380                                             __func__, task);
 381                                 return TASK_IS_NOT_AT_LU;
 382                         case TMF_RESP_FUNC_FAILED:
 383                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 384                                                 __func__, task);
 385                                 return TASK_ABORT_FAILED;
 386                         }
 387
 388                 }
 389         }
 390         return res;
 391 }
 392
 393 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 394 {
 395         int res = TMF_RESP_FUNC_FAILED;
 396         struct scsi_lun lun;
 397         struct sas_internal *i =
 398                 to_sas_internal(dev->port->ha->core.shost->transportt);
 399
 400         int_to_scsilun(cmd->device->lun, &lun);
 401
 402         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 403                     SAS_ADDR(dev->sas_addr),
 404                     cmd->device->lun);
 405
 406         if (i->dft->lldd_abort_task_set)
 407                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 408
 409         if (res == TMF_RESP_FUNC_FAILED) {
 410                 if (i->dft->lldd_clear_task_set)
 411                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 412         }
 413
 414         if (res == TMF_RESP_FUNC_FAILED) {
 415                 if (i->dft->lldd_lu_reset)
 416                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 417         }
 418
 419         return res;
 420 }
 421
 422 static int sas_recover_I_T(struct domain_device *dev)
 423 {
 424         int res = TMF_RESP_FUNC_FAILED;
 425         struct sas_internal *i =
 426                 to_sas_internal(dev->port->ha->core.shost->transportt);
 427
 428         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 429                     SAS_ADDR(dev->sas_addr));
 430
 431         if (i->dft->lldd_I_T_nexus_reset)
 432                 res = i->dft->lldd_I_T_nexus_reset(dev);
 433
 434         return res;
 435 }
 436
 437 /* Find the sas_phy that's attached to this device */
 438 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
 439 {
 440         struct domain_device *pdev = dev->parent;
 441         struct ex_phy *exphy = NULL;
 442         int i;
 443
 444         /* Directly attached device */
 445         if (!pdev)
 446                 return dev->port->phy;
 447
 448         /* Otherwise look in the expander */
 449         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 450                 if (!memcmp(dev->sas_addr,
 451                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 452                             SAS_ADDR_SIZE)) {
 453                         exphy = &pdev->ex_dev.ex_phy[i];
 454                         break;
 455                 }
 456
 457         BUG_ON(!exphy);
 458         return exphy->phy;
 459 }
 460 EXPORT_SYMBOL_GPL(sas_find_local_phy);
 461
 462 /* Attempt to send a LUN reset message to a device */
 463 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 464 {
 465         struct domain_device *dev = cmd_to_domain_dev(cmd);
 466         struct sas_internal *i =
 467                 to_sas_internal(dev->port->ha->core.shost->transportt);
 468         struct scsi_lun lun;
 469         int res;
 470
 471         int_to_scsilun(cmd->device->lun, &lun);
 472
 473         if (!i->dft->lldd_lu_reset)
 474                 return FAILED;
 475
 476         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 477         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 478                 return SUCCESS;
 479
 480         return FAILED;
 481 }
 482
 483 /* Attempt to send a phy (bus) reset */
 484 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 485 {
 486         struct domain_device *dev = cmd_to_domain_dev(cmd);
 487         struct sas_phy *phy = sas_find_local_phy(dev);
 488         int res;
 489
 490         res = sas_phy_reset(phy, 1);
 491         if (res)
 492                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 493                             kobject_name(&phy->dev.kobj),
 494                             res);
 495         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 496                 return SUCCESS;
 497
 498         return FAILED;
 499 }
 500
 501 /* Try to reset a device */
 502 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
 503 {
 504         int res;
 505         struct Scsi_Host *shost = cmd->device->host;
 506
 507         if (!shost->hostt->eh_device_reset_handler)
 508                 goto try_bus_reset;
 509
 510         res = shost->hostt->eh_device_reset_handler(cmd);
 511         if (res == SUCCESS)
 512                 return res;
 513
 514 try_bus_reset:
 515         if (shost->hostt->eh_bus_reset_handler)
 516                 return shost->hostt->eh_bus_reset_handler(cmd);
 517
 518         return FAILED;
 519 }
 520
 521 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 522                                     struct list_head *work_q,
 523                                     struct list_head *done_q)
 524 {
 525         struct scsi_cmnd *cmd, *n;
 526         enum task_disposition res = TASK_IS_DONE;
 527         int tmf_resp, need_reset;
 528         struct sas_internal *i = to_sas_internal(shost->transportt);
 529         unsigned long flags;
 530         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 531
 532 Again:
 533         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 534                 struct sas_task *task = TO_SAS_TASK(cmd);
 535
 536                 if (!task)
 537                         continue;
 538
 539                 list_del_init(&cmd->eh_entry);
 540
 541                 spin_lock_irqsave(&task->task_state_lock, flags);
 542                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 543                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 544
 545                 if (need_reset) {
 546                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
 547                                     __func__, task);
 548                         goto reset;
 549                 }
 550
 551                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 552                 res = sas_scsi_find_task(task);
 553
 554                 cmd->eh_eflags = 0;
 555
 556                 switch (res) {
 557                 case TASK_IS_DONE:
 558                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 559                                     task);
 560                         sas_eh_finish_cmd(cmd);
 561                         continue;
 562                 case TASK_IS_ABORTED:
 563                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 564                                     __func__, task);
 565                         sas_eh_finish_cmd(cmd);
 566                         continue;
 567                 case TASK_IS_AT_LU:
 568                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 569  reset:
 570                         tmf_resp = sas_recover_lu(task->dev, cmd);
 571                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 572                                 SAS_DPRINTK("dev %016llx LU %x is "
 573                                             "recovered\n",
 574                                             SAS_ADDR(task->dev),
 575                                             cmd->device->lun);
 576                                 sas_eh_finish_cmd(cmd);
 577                                 sas_scsi_clear_queue_lu(work_q, cmd);
 578                                 goto Again;
 579                         }
 580                         /* fallthrough */
 581                 case TASK_IS_NOT_AT_LU:
 582                 case TASK_ABORT_FAILED:
 583                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 584                                     task);
 585                         tmf_resp = sas_recover_I_T(task->dev);
 586                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 587                                 struct domain_device *dev = task->dev;
 588                                 SAS_DPRINTK("I_T %016llx recovered\n",
 589                                             SAS_ADDR(task->dev->sas_addr));
 590                                 sas_eh_finish_cmd(cmd);
 591                                 sas_scsi_clear_queue_I_T(work_q, dev);
 592                                 goto Again;
 593                         }
 594                         /* Hammer time :-) */
 595                         try_to_reset_cmd_device(cmd);
 596                         if (i->dft->lldd_clear_nexus_port) {
 597                                 struct asd_sas_port *port = task->dev->port;
 598                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 599                                             port->id);
 600                                 res = i->dft->lldd_clear_nexus_port(port);
 601                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 602                                         SAS_DPRINTK("clear nexus port:%d "
 603                                                     "succeeded\n", port->id);
 604                                         sas_eh_finish_cmd(cmd);
 605                                         sas_scsi_clear_queue_port(work_q,
 606                                                                   port);
 607                                         goto Again;
 608                                 }
 609                         }
 610                         if (i->dft->lldd_clear_nexus_ha) {
 611                                 SAS_DPRINTK("clear nexus ha\n");
 612                                 res = i->dft->lldd_clear_nexus_ha(ha);
 613                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 614                                         SAS_DPRINTK("clear nexus ha "
 615                                                     "succeeded\n");
 616                                         sas_eh_finish_cmd(cmd);
 617                                         goto clear_q;
 618                                 }
 619                         }
 620                         /* If we are here -- this means that no amount
 621                          * of effort could recover from errors.  Quite
 622                          * possibly the HA just disappeared.
 623                          */
 624                         SAS_DPRINTK("error from  device %llx, LUN %x "
 625                                     "couldn't be recovered in any way\n",
 626                                     SAS_ADDR(task->dev->sas_addr),
 627                                     cmd->device->lun);
 628
 629                         sas_eh_finish_cmd(cmd);
 630                         goto clear_q;
 631                 }
 632         }
 633         return list_empty(work_q);
 634 clear_q:
 635         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
 636         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 637                 sas_eh_finish_cmd(cmd);
 638
 639         return list_empty(work_q);
 640 }
 641
 642 void sas_scsi_recover_host(struct Scsi_Host *shost)
 643 {
 644         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 645         unsigned long flags;
 646         LIST_HEAD(eh_work_q);
 647
 648         spin_lock_irqsave(shost->host_lock, flags);
 649         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 650         spin_unlock_irqrestore(shost->host_lock, flags);
 651
 652         SAS_DPRINTK("Enter %s\n", __func__);
 653         /*
 654          * Deal with commands that still have SAS tasks (i.e. they didn't
 655          * complete via the normal sas_task completion mechanism)
 656          */
 657         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 658                 goto out;
 659
 660         /*
 661          * Now deal with SCSI commands that completed ok but have a an error
 662          * code (and hopefully sense data) attached.  This is roughly what
 663          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 664          * command we see here has no sas_task and is thus unknown to the HA.
 665          */
 666         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 667                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 668
 669 out:
 670         scsi_eh_flush_done_q(&ha->eh_done_q);
 671         SAS_DPRINTK("--- Exit %s\n", __func__);
 672         return;
 673 }
 674
 675 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 676 {
 677         struct sas_task *task = TO_SAS_TASK(cmd);
 678         unsigned long flags;
 679
 680         if (!task) {
 681                 cmd->request->timeout /= 2;
 682                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 683                             cmd, task, (cmd->request->timeout ?
 684                             "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
 685                 if (!cmd->request->timeout)
 686                         return BLK_EH_NOT_HANDLED;
 687                 return BLK_EH_RESET_TIMER;
 688         }
 689
 690         spin_lock_irqsave(&task->task_state_lock, flags);
 691         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 692         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 693                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 694                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
 695                             "BLK_EH_HANDLED\n", cmd, task);
 696                 return BLK_EH_HANDLED;
 697         }
 698         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 699                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 700                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 701                             "BLK_EH_RESET_TIMER\n",
 702                             cmd, task);
 703                 return BLK_EH_RESET_TIMER;
 704         }
 705         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 706         spin_unlock_irqrestore(&task->task_state_lock, flags);
 707
 708         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
 709                     cmd, task);
 710
 711         return BLK_EH_NOT_HANDLED;
 712 }
 713
 714 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 715 {
 716         struct domain_device *dev = sdev_to_domain_dev(sdev);
 717
 718         if (dev_is_sata(dev))
 719                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
 720
 721         return -EINVAL;
 722 }
 723
 724 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 725 {
 726         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 727         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 728         struct domain_device *found_dev = NULL;
 729         int i;
 730         unsigned long flags;
 731
 732         spin_lock_irqsave(&ha->phy_port_lock, flags);
 733         for (i = 0; i < ha->num_phys; i++) {
 734                 struct asd_sas_port *port = ha->sas_port[i];
 735                 struct domain_device *dev;
 736
 737                 spin_lock(&port->dev_list_lock);
 738                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 739                         if (rphy == dev->rphy) {
 740                                 found_dev = dev;
 741                                 spin_unlock(&port->dev_list_lock);
 742                                 goto found;
 743                         }
 744                 }
 745                 spin_unlock(&port->dev_list_lock);
 746         }
 747  found:
 748         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 749
 750         return found_dev;
 751 }
 752
 753 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 754 {
 755         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 756
 757         return sas_find_dev_by_rphy(rphy);
 758 }
 759
 760 int sas_target_alloc(struct scsi_target *starget)
 761 {
 762         struct domain_device *found_dev = sas_find_target(starget);
 763         int res;
 764
 765         if (!found_dev)
 766                 return -ENODEV;
 767
 768         if (dev_is_sata(found_dev)) {
 769                 res = sas_ata_init_host_and_port(found_dev, starget);
 770                 if (res)
 771                         return res;
 772         }
 773
 774         starget->hostdata = found_dev;
 775         return 0;
 776 }
 777
 778 #define SAS_DEF_QD 32
 779 #define SAS_MAX_QD 64
 780
 781 int sas_slave_configure(struct scsi_device *scsi_dev)
 782 {
 783         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 784         struct sas_ha_struct *sas_ha;
 785
 786         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 787
 788         if (dev_is_sata(dev)) {
 789                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 790                 return 0;
 791         }
 792
 793         sas_ha = dev->port->ha;
 794
 795         sas_read_port_mode_page(scsi_dev);
 796
 797         if (scsi_dev->tagged_supported) {
 798                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 799                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 800         } else {
 801                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 802                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 803                             scsi_dev->lun);
 804                 scsi_dev->tagged_supported = 0;
 805                 scsi_set_tag_type(scsi_dev, 0);
 806                 scsi_deactivate_tcq(scsi_dev, 1);
 807         }
 808
 809         scsi_dev->allow_restart = 1;
 810
 811         return 0;
 812 }
 813
 814 void sas_slave_destroy(struct scsi_device *scsi_dev)
 815 {
 816         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 817
 818         if (dev_is_sata(dev))
 819                 dev->sata_dev.ap->link.device[0].class = ATA_DEV_NONE;
 820 }
 821
 822 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth,
 823                            int reason)
 824 {
 825         int res = min(new_depth, SAS_MAX_QD);
 826
 827         if (reason != SCSI_QDEPTH_DEFAULT)
 828                 return -EOPNOTSUPP;
 829
 830         if (scsi_dev->tagged_supported)
 831                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 832                                         res);
 833         else {
 834                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 835                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 836                            SAS_ADDR(dev->sas_addr),
 837                            scsi_dev->lun);
 838                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 839                 res = 1;
 840         }
 841
 842         return res;
 843 }
 844
 845 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 846 {
 847         if (!scsi_dev->tagged_supported)
 848                 return 0;
 849
 850         scsi_deactivate_tcq(scsi_dev, 1);
 851
 852         scsi_set_tag_type(scsi_dev, qt);
 853         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 854
 855         return qt;
 856 }
 857
 858 int sas_bios_param(struct scsi_device *scsi_dev,
 859                           struct block_device *bdev,
 860                           sector_t capacity, int *hsc)
 861 {
 862         hsc[0] = 255;
 863         hsc[1] = 63;
 864         sector_div(capacity, 255*63);
 865         hsc[2] = capacity;
 866
 867         return 0;
 868 }
 869
 870 /* ---------- Task Collector Thread implementation ---------- */
 871
 872 static void sas_queue(struct sas_ha_struct *sas_ha)
 873 {
 874         struct scsi_core *core = &sas_ha->core;
 875         unsigned long flags;
 876         LIST_HEAD(q);
 877         int can_queue;
 878         int res;
 879         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 880
 881         spin_lock_irqsave(&core->task_queue_lock, flags);
 882         while (!kthread_should_stop() &&
 883                !list_empty(&core->task_queue)) {
 884
 885                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 886                 if (can_queue >= 0) {
 887                         can_queue = core->task_queue_size;
 888                         list_splice_init(&core->task_queue, &q);
 889                 } else {
 890                         struct list_head *a, *n;
 891
 892                         can_queue = sas_ha->lldd_queue_size;
 893                         list_for_each_safe(a, n, &core->task_queue) {
 894                                 list_move_tail(a, &q);
 895                                 if (--can_queue == 0)
 896                                         break;
 897                         }
 898                         can_queue = sas_ha->lldd_queue_size;
 899                 }
 900                 core->task_queue_size -= can_queue;
 901                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 902                 {
 903                         struct sas_task *task = list_entry(q.next,
 904                                                            struct sas_task,
 905                                                            list);
 906                         list_del_init(&q);
 907                         res = i->dft->lldd_execute_task(task, can_queue,
 908                                                         GFP_KERNEL);
 909                         if (unlikely(res))
 910                                 __list_add(&q, task->list.prev, &task->list);
 911                 }
 912                 spin_lock_irqsave(&core->task_queue_lock, flags);
 913                 if (res) {
 914                         list_splice_init(&q, &core->task_queue); /*at head*/
 915                         core->task_queue_size += can_queue;
 916                 }
 917         }
 918         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 919 }
 920
 921 /**
 922  * sas_queue_thread -- The Task Collector thread
 923  * @_sas_ha: pointer to struct sas_ha
 924  */
 925 static int sas_queue_thread(void *_sas_ha)
 926 {
 927         struct sas_ha_struct *sas_ha = _sas_ha;
 928
 929         while (1) {
 930                 set_current_state(TASK_INTERRUPTIBLE);
 931                 schedule();
 932                 sas_queue(sas_ha);
 933                 if (kthread_should_stop())
 934                         break;
 935         }
 936
 937         return 0;
 938 }
 939
 940 int sas_init_queue(struct sas_ha_struct *sas_ha)
 941 {
 942         struct scsi_core *core = &sas_ha->core;
 943
 944         spin_lock_init(&core->task_queue_lock);
 945         core->task_queue_size = 0;
 946         INIT_LIST_HEAD(&core->task_queue);
 947
 948         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 949                                          "sas_queue_%d", core->shost->host_no);
 950         if (IS_ERR(core->queue_thread))
 951                 return PTR_ERR(core->queue_thread);
 952         return 0;
 953 }
 954
 955 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 956 {
 957         unsigned long flags;
 958         struct scsi_core *core = &sas_ha->core;
 959         struct sas_task *task, *n;
 960
 961         kthread_stop(core->queue_thread);
 962
 963         if (!list_empty(&core->task_queue))
 964                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 965                             SAS_ADDR(sas_ha->sas_addr));
 966
 967         spin_lock_irqsave(&core->task_queue_lock, flags);
 968         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 969                 struct scsi_cmnd *cmd = task->uldd_task;
 970
 971                 list_del_init(&task->list);
 972
 973                 ASSIGN_SAS_TASK(cmd, NULL);
 974                 sas_free_task(task);
 975                 cmd->result = DID_ABORT << 16;
 976                 cmd->scsi_done(cmd);
 977         }
 978         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 979 }
 980
 981 /*
 982  * Call the LLDD task abort routine directly.  This function is intended for
 983  * use by upper layers that need to tell the LLDD to abort a task.
 984  */
 985 int __sas_task_abort(struct sas_task *task)
 986 {
 987         struct sas_internal *si =
 988                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 989         unsigned long flags;
 990         int res;
 991
 992         spin_lock_irqsave(&task->task_state_lock, flags);
 993         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 994             task->task_state_flags & SAS_TASK_STATE_DONE) {
 995                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 996                 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
 997                             task);
 998                 return 0;
 999         }
1000         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
1001         spin_unlock_irqrestore(&task->task_state_lock, flags);
1002
1003         if (!si->dft->lldd_abort_task)
1004                 return -ENODEV;
1005
1006         res = si->dft->lldd_abort_task(task);
1007
1008         spin_lock_irqsave(&task->task_state_lock, flags);
1009         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1010             (res == TMF_RESP_FUNC_COMPLETE))
1011         {
1012                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1013                 task->task_done(task);
1014                 return 0;
1015         }
1016
1017         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1018                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1019         spin_unlock_irqrestore(&task->task_state_lock, flags);
1020
1021         return -EAGAIN;
1022 }
1023
1024 /*
1025  * Tell an upper layer that it needs to initiate an abort for a given task.
1026  * This should only ever be called by an LLDD.
1027  */
1028 void sas_task_abort(struct sas_task *task)
1029 {
1030         struct scsi_cmnd *sc = task->uldd_task;
1031
1032         /* Escape for libsas internal commands */
1033         if (!sc) {
1034                 if (!del_timer(&task->timer))
1035                         return;
1036                 task->timer.function(task->timer.data);
1037                 return;
1038         }
1039
1040         if (dev_is_sata(task->dev)) {
1041                 sas_ata_task_abort(task);
1042         } else {
1043                 struct request_queue *q = sc->device->request_queue;
1044                 unsigned long flags;
1045
1046                 spin_lock_irqsave(q->queue_lock, flags);
1047                 blk_abort_request(sc->request);
1048                 spin_unlock_irqrestore(q->queue_lock, flags);
1049                 scsi_schedule_eh(sc->device->host);
1050         }
1051 }
1052
1053 int sas_slave_alloc(struct scsi_device *scsi_dev)
1054 {
1055         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1056
1057         if (dev_is_sata(dev))
1058                 return ata_sas_port_init(dev->sata_dev.ap);
1059
1060         return 0;
1061 }
1062
1063 void sas_target_destroy(struct scsi_target *starget)
1064 {
1065         struct domain_device *found_dev = sas_find_target(starget);
1066
1067         if (!found_dev)
1068                 return;
1069
1070         if (dev_is_sata(found_dev))
1071                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1072
1073         return;
1074 }
1075
1076 static void sas_parse_addr(u8 *sas_addr, const char *p)
1077 {
1078         int i;
1079         for (i = 0; i < SAS_ADDR_SIZE; i++) {
1080                 u8 h, l;
1081                 if (!*p)
1082                         break;
1083                 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1084                 p++;
1085                 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1086                 p++;
1087                 sas_addr[i] = (h<<4) | l;
1088         }
1089 }
1090
1091 #define SAS_STRING_ADDR_SIZE    16
1092
1093 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1094 {
1095         int res;
1096         const struct firmware *fw;
1097
1098         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1099         if (res)
1100                 return res;
1101
1102         if (fw->size < SAS_STRING_ADDR_SIZE) {
1103                 res = -ENODEV;
1104                 goto out;
1105         }
1106
1107         sas_parse_addr(addr, fw->data);
1108
1109 out:
1110         release_firmware(fw);
1111         return res;
1112 }
1113 EXPORT_SYMBOL_GPL(sas_request_addr);
1114
1115 EXPORT_SYMBOL_GPL(sas_queuecommand);
1116 EXPORT_SYMBOL_GPL(sas_target_alloc);
1117 EXPORT_SYMBOL_GPL(sas_slave_configure);
1118 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1119 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1120 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1121 EXPORT_SYMBOL_GPL(sas_bios_param);
1122 EXPORT_SYMBOL_GPL(__sas_task_abort);
1123 EXPORT_SYMBOL_GPL(sas_task_abort);
1124 EXPORT_SYMBOL_GPL(sas_phy_reset);
1125 EXPORT_SYMBOL_GPL(sas_phy_enable);
1126 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1127 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1128 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1129 EXPORT_SYMBOL_GPL(sas_target_destroy);
1130 EXPORT_SYMBOL_GPL(sas_ioctl);