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