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 int sas_queuecommand(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 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
 258 {
 259         struct sas_task *task = TO_SAS_TASK(cmd);
 260         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
 261
 262         /* remove the aborted task flag to allow the task to be
 263          * completed now. At this point, we only get called following
 264          * an actual abort of the task, so we should be guaranteed not
 265          * to be racing with any completions from the LLD (hence we
 266          * don't need the task state lock to clear the flag) */
 267         task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 268         /* Now call task_done.  However, task will be free'd after
 269          * this */
 270         task->task_done(task);
 271         /* now finish the command and move it on to the error
 272          * handler done list, this also takes it off the
 273          * error handler pending list */
 274         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
 275 }
 276
 277 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 278 {
 279         struct scsi_cmnd *cmd, *n;
 280
 281         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 282                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
 283                     cmd->device->lun == my_cmd->device->lun)
 284                         sas_eh_finish_cmd(cmd);
 285         }
 286 }
 287
 288 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 289                                      struct domain_device *dev)
 290 {
 291         struct scsi_cmnd *cmd, *n;
 292
 293         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 294                 struct domain_device *x = cmd_to_domain_dev(cmd);
 295
 296                 if (x == dev)
 297                         sas_eh_finish_cmd(cmd);
 298         }
 299 }
 300
 301 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 302                                       struct asd_sas_port *port)
 303 {
 304         struct scsi_cmnd *cmd, *n;
 305
 306         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 307                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 308                 struct asd_sas_port *x = dev->port;
 309
 310                 if (x == port)
 311                         sas_eh_finish_cmd(cmd);
 312         }
 313 }
 314
 315 enum task_disposition {
 316         TASK_IS_DONE,
 317         TASK_IS_ABORTED,
 318         TASK_IS_AT_LU,
 319         TASK_IS_NOT_AT_LU,
 320         TASK_ABORT_FAILED,
 321 };
 322
 323 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 324 {
 325         struct sas_ha_struct *ha = task->dev->port->ha;
 326         unsigned long flags;
 327         int i, res;
 328         struct sas_internal *si =
 329                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 330
 331         if (ha->lldd_max_execute_num > 1) {
 332                 struct scsi_core *core = &ha->core;
 333                 struct sas_task *t, *n;
 334
 335                 spin_lock_irqsave(&core->task_queue_lock, flags);
 336                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 337                         if (task == t) {
 338                                 list_del_init(&t->list);
 339                                 spin_unlock_irqrestore(&core->task_queue_lock,
 340                                                        flags);
 341                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 342                                             "task_queue\n",
 343                                             __func__, task);
 344                                 return TASK_IS_ABORTED;
 345                         }
 346                 }
 347                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 348         }
 349
 350         for (i = 0; i < 5; i++) {
 351                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
 352                 res = si->dft->lldd_abort_task(task);
 353
 354                 spin_lock_irqsave(&task->task_state_lock, flags);
 355                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 356                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 357                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 358                                     task);
 359                         return TASK_IS_DONE;
 360                 }
 361                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 362
 363                 if (res == TMF_RESP_FUNC_COMPLETE) {
 364                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 365                                     __func__, task);
 366                         return TASK_IS_ABORTED;
 367                 } else if (si->dft->lldd_query_task) {
 368                         SAS_DPRINTK("%s: querying task 0x%p\n",
 369                                     __func__, task);
 370                         res = si->dft->lldd_query_task(task);
 371                         switch (res) {
 372                         case TMF_RESP_FUNC_SUCC:
 373                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 374                                             __func__, task);
 375                                 return TASK_IS_AT_LU;
 376                         case TMF_RESP_FUNC_COMPLETE:
 377                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 378                                             __func__, task);
 379                                 return TASK_IS_NOT_AT_LU;
 380                         case TMF_RESP_FUNC_FAILED:
 381                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 382                                                 __func__, task);
 383                                 return TASK_ABORT_FAILED;
 384                         }
 385
 386                 }
 387         }
 388         return res;
 389 }
 390
 391 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 392 {
 393         int res = TMF_RESP_FUNC_FAILED;
 394         struct scsi_lun lun;
 395         struct sas_internal *i =
 396                 to_sas_internal(dev->port->ha->core.shost->transportt);
 397
 398         int_to_scsilun(cmd->device->lun, &lun);
 399
 400         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 401                     SAS_ADDR(dev->sas_addr),
 402                     cmd->device->lun);
 403
 404         if (i->dft->lldd_abort_task_set)
 405                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 406
 407         if (res == TMF_RESP_FUNC_FAILED) {
 408                 if (i->dft->lldd_clear_task_set)
 409                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 410         }
 411
 412         if (res == TMF_RESP_FUNC_FAILED) {
 413                 if (i->dft->lldd_lu_reset)
 414                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 415         }
 416
 417         return res;
 418 }
 419
 420 static int sas_recover_I_T(struct domain_device *dev)
 421 {
 422         int res = TMF_RESP_FUNC_FAILED;
 423         struct sas_internal *i =
 424                 to_sas_internal(dev->port->ha->core.shost->transportt);
 425
 426         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 427                     SAS_ADDR(dev->sas_addr));
 428
 429         if (i->dft->lldd_I_T_nexus_reset)
 430                 res = i->dft->lldd_I_T_nexus_reset(dev);
 431
 432         return res;
 433 }
 434
 435 /* Find the sas_phy that's attached to this device */
 436 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
 437 {
 438         struct domain_device *pdev = dev->parent;
 439         struct ex_phy *exphy = NULL;
 440         int i;
 441
 442         /* Directly attached device */
 443         if (!pdev)
 444                 return dev->port->phy;
 445
 446         /* Otherwise look in the expander */
 447         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 448                 if (!memcmp(dev->sas_addr,
 449                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 450                             SAS_ADDR_SIZE)) {
 451                         exphy = &pdev->ex_dev.ex_phy[i];
 452                         break;
 453                 }
 454
 455         BUG_ON(!exphy);
 456         return exphy->phy;
 457 }
 458 EXPORT_SYMBOL_GPL(sas_find_local_phy);
 459
 460 /* Attempt to send a LUN reset message to a device */
 461 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 462 {
 463         struct domain_device *dev = cmd_to_domain_dev(cmd);
 464         struct sas_internal *i =
 465                 to_sas_internal(dev->port->ha->core.shost->transportt);
 466         struct scsi_lun lun;
 467         int res;
 468
 469         int_to_scsilun(cmd->device->lun, &lun);
 470
 471         if (!i->dft->lldd_lu_reset)
 472                 return FAILED;
 473
 474         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 475         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 476                 return SUCCESS;
 477
 478         return FAILED;
 479 }
 480
 481 /* Attempt to send a phy (bus) reset */
 482 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 483 {
 484         struct domain_device *dev = cmd_to_domain_dev(cmd);
 485         struct sas_phy *phy = sas_find_local_phy(dev);
 486         int res;
 487
 488         res = sas_phy_reset(phy, 1);
 489         if (res)
 490                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 491                             kobject_name(&phy->dev.kobj),
 492                             res);
 493         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 494                 return SUCCESS;
 495
 496         return FAILED;
 497 }
 498
 499 /* Try to reset a device */
 500 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
 501 {
 502         int res;
 503         struct Scsi_Host *shost = cmd->device->host;
 504
 505         if (!shost->hostt->eh_device_reset_handler)
 506                 goto try_bus_reset;
 507
 508         res = shost->hostt->eh_device_reset_handler(cmd);
 509         if (res == SUCCESS)
 510                 return res;
 511
 512 try_bus_reset:
 513         if (shost->hostt->eh_bus_reset_handler)
 514                 return shost->hostt->eh_bus_reset_handler(cmd);
 515
 516         return FAILED;
 517 }
 518
 519 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 520                                     struct list_head *work_q,
 521                                     struct list_head *done_q)
 522 {
 523         struct scsi_cmnd *cmd, *n;
 524         enum task_disposition res = TASK_IS_DONE;
 525         int tmf_resp, need_reset;
 526         struct sas_internal *i = to_sas_internal(shost->transportt);
 527         unsigned long flags;
 528         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 529
 530 Again:
 531         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 532                 struct sas_task *task = TO_SAS_TASK(cmd);
 533
 534                 if (!task)
 535                         continue;
 536
 537                 list_del_init(&cmd->eh_entry);
 538
 539                 spin_lock_irqsave(&task->task_state_lock, flags);
 540                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 541                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 542
 543                 if (need_reset) {
 544                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
 545                                     __func__, task);
 546                         goto reset;
 547                 }
 548
 549                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 550                 res = sas_scsi_find_task(task);
 551
 552                 cmd->eh_eflags = 0;
 553
 554                 switch (res) {
 555                 case TASK_IS_DONE:
 556                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 557                                     task);
 558                         sas_eh_finish_cmd(cmd);
 559                         continue;
 560                 case TASK_IS_ABORTED:
 561                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 562                                     __func__, task);
 563                         sas_eh_finish_cmd(cmd);
 564                         continue;
 565                 case TASK_IS_AT_LU:
 566                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 567  reset:
 568                         tmf_resp = sas_recover_lu(task->dev, cmd);
 569                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 570                                 SAS_DPRINTK("dev %016llx LU %x is "
 571                                             "recovered\n",
 572                                             SAS_ADDR(task->dev),
 573                                             cmd->device->lun);
 574                                 sas_eh_finish_cmd(cmd);
 575                                 sas_scsi_clear_queue_lu(work_q, cmd);
 576                                 goto Again;
 577                         }
 578                         /* fallthrough */
 579                 case TASK_IS_NOT_AT_LU:
 580                 case TASK_ABORT_FAILED:
 581                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 582                                     task);
 583                         tmf_resp = sas_recover_I_T(task->dev);
 584                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 585                                 struct domain_device *dev = task->dev;
 586                                 SAS_DPRINTK("I_T %016llx recovered\n",
 587                                             SAS_ADDR(task->dev->sas_addr));
 588                                 sas_eh_finish_cmd(cmd);
 589                                 sas_scsi_clear_queue_I_T(work_q, dev);
 590                                 goto Again;
 591                         }
 592                         /* Hammer time :-) */
 593                         try_to_reset_cmd_device(cmd);
 594                         if (i->dft->lldd_clear_nexus_port) {
 595                                 struct asd_sas_port *port = task->dev->port;
 596                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 597                                             port->id);
 598                                 res = i->dft->lldd_clear_nexus_port(port);
 599                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 600                                         SAS_DPRINTK("clear nexus port:%d "
 601                                                     "succeeded\n", port->id);
 602                                         sas_eh_finish_cmd(cmd);
 603                                         sas_scsi_clear_queue_port(work_q,
 604                                                                   port);
 605                                         goto Again;
 606                                 }
 607                         }
 608                         if (i->dft->lldd_clear_nexus_ha) {
 609                                 SAS_DPRINTK("clear nexus ha\n");
 610                                 res = i->dft->lldd_clear_nexus_ha(ha);
 611                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 612                                         SAS_DPRINTK("clear nexus ha "
 613                                                     "succeeded\n");
 614                                         sas_eh_finish_cmd(cmd);
 615                                         goto clear_q;
 616                                 }
 617                         }
 618                         /* If we are here -- this means that no amount
 619                          * of effort could recover from errors.  Quite
 620                          * possibly the HA just disappeared.
 621                          */
 622                         SAS_DPRINTK("error from  device %llx, LUN %x "
 623                                     "couldn't be recovered in any way\n",
 624                                     SAS_ADDR(task->dev->sas_addr),
 625                                     cmd->device->lun);
 626
 627                         sas_eh_finish_cmd(cmd);
 628                         goto clear_q;
 629                 }
 630         }
 631         return list_empty(work_q);
 632 clear_q:
 633         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
 634         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 635                 sas_eh_finish_cmd(cmd);
 636
 637         return list_empty(work_q);
 638 }
 639
 640 void sas_scsi_recover_host(struct Scsi_Host *shost)
 641 {
 642         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 643         unsigned long flags;
 644         LIST_HEAD(eh_work_q);
 645
 646         spin_lock_irqsave(shost->host_lock, flags);
 647         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 648         spin_unlock_irqrestore(shost->host_lock, flags);
 649
 650         SAS_DPRINTK("Enter %s\n", __func__);
 651         /*
 652          * Deal with commands that still have SAS tasks (i.e. they didn't
 653          * complete via the normal sas_task completion mechanism)
 654          */
 655         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 656                 goto out;
 657
 658         /*
 659          * Now deal with SCSI commands that completed ok but have a an error
 660          * code (and hopefully sense data) attached.  This is roughly what
 661          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 662          * command we see here has no sas_task and is thus unknown to the HA.
 663          */
 664         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 665                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 666
 667 out:
 668         scsi_eh_flush_done_q(&ha->eh_done_q);
 669         SAS_DPRINTK("--- Exit %s\n", __func__);
 670         return;
 671 }
 672
 673 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 674 {
 675         struct sas_task *task = TO_SAS_TASK(cmd);
 676         unsigned long flags;
 677
 678         if (!task) {
 679                 cmd->request->timeout /= 2;
 680                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 681                             cmd, task, (cmd->request->timeout ?
 682                             "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
 683                 if (!cmd->request->timeout)
 684                         return BLK_EH_NOT_HANDLED;
 685                 return BLK_EH_RESET_TIMER;
 686         }
 687
 688         spin_lock_irqsave(&task->task_state_lock, flags);
 689         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 690         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 691                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 692                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
 693                             "BLK_EH_HANDLED\n", cmd, task);
 694                 return BLK_EH_HANDLED;
 695         }
 696         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 697                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 698                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 699                             "BLK_EH_RESET_TIMER\n",
 700                             cmd, task);
 701                 return BLK_EH_RESET_TIMER;
 702         }
 703         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 704         spin_unlock_irqrestore(&task->task_state_lock, flags);
 705
 706         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
 707                     cmd, task);
 708
 709         return BLK_EH_NOT_HANDLED;
 710 }
 711
 712 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 713 {
 714         struct domain_device *dev = sdev_to_domain_dev(sdev);
 715
 716         if (dev_is_sata(dev))
 717                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
 718
 719         return -EINVAL;
 720 }
 721
 722 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 723 {
 724         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 725         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 726         struct domain_device *found_dev = NULL;
 727         int i;
 728         unsigned long flags;
 729
 730         spin_lock_irqsave(&ha->phy_port_lock, flags);
 731         for (i = 0; i < ha->num_phys; i++) {
 732                 struct asd_sas_port *port = ha->sas_port[i];
 733                 struct domain_device *dev;
 734
 735                 spin_lock(&port->dev_list_lock);
 736                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 737                         if (rphy == dev->rphy) {
 738                                 found_dev = dev;
 739                                 spin_unlock(&port->dev_list_lock);
 740                                 goto found;
 741                         }
 742                 }
 743                 spin_unlock(&port->dev_list_lock);
 744         }
 745  found:
 746         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 747
 748         return found_dev;
 749 }
 750
 751 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 752 {
 753         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 754
 755         return sas_find_dev_by_rphy(rphy);
 756 }
 757
 758 int sas_target_alloc(struct scsi_target *starget)
 759 {
 760         struct domain_device *found_dev = sas_find_target(starget);
 761         int res;
 762
 763         if (!found_dev)
 764                 return -ENODEV;
 765
 766         if (dev_is_sata(found_dev)) {
 767                 res = sas_ata_init_host_and_port(found_dev, starget);
 768                 if (res)
 769                         return res;
 770         }
 771
 772         starget->hostdata = found_dev;
 773         return 0;
 774 }
 775
 776 #define SAS_DEF_QD 32
 777 #define SAS_MAX_QD 64
 778
 779 int sas_slave_configure(struct scsi_device *scsi_dev)
 780 {
 781         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 782         struct sas_ha_struct *sas_ha;
 783
 784         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 785
 786         if (dev_is_sata(dev)) {
 787                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 788                 return 0;
 789         }
 790
 791         sas_ha = dev->port->ha;
 792
 793         sas_read_port_mode_page(scsi_dev);
 794
 795         if (scsi_dev->tagged_supported) {
 796                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 797                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 798         } else {
 799                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 800                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 801                             scsi_dev->lun);
 802                 scsi_dev->tagged_supported = 0;
 803                 scsi_set_tag_type(scsi_dev, 0);
 804                 scsi_deactivate_tcq(scsi_dev, 1);
 805         }
 806
 807         scsi_dev->allow_restart = 1;
 808
 809         return 0;
 810 }
 811
 812 void sas_slave_destroy(struct scsi_device *scsi_dev)
 813 {
 814         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 815
 816         if (dev_is_sata(dev))
 817                 dev->sata_dev.ap->link.device[0].class = ATA_DEV_NONE;
 818 }
 819
 820 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth,
 821                            int reason)
 822 {
 823         int res = min(new_depth, SAS_MAX_QD);
 824
 825         if (reason != SCSI_QDEPTH_DEFAULT)
 826                 return -EOPNOTSUPP;
 827
 828         if (scsi_dev->tagged_supported)
 829                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 830                                         res);
 831         else {
 832                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 833                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 834                            SAS_ADDR(dev->sas_addr),
 835                            scsi_dev->lun);
 836                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 837                 res = 1;
 838         }
 839
 840         return res;
 841 }
 842
 843 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 844 {
 845         if (!scsi_dev->tagged_supported)
 846                 return 0;
 847
 848         scsi_deactivate_tcq(scsi_dev, 1);
 849
 850         scsi_set_tag_type(scsi_dev, qt);
 851         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 852
 853         return qt;
 854 }
 855
 856 int sas_bios_param(struct scsi_device *scsi_dev,
 857                           struct block_device *bdev,
 858                           sector_t capacity, int *hsc)
 859 {
 860         hsc[0] = 255;
 861         hsc[1] = 63;
 862         sector_div(capacity, 255*63);
 863         hsc[2] = capacity;
 864
 865         return 0;
 866 }
 867
 868 /* ---------- Task Collector Thread implementation ---------- */
 869
 870 static void sas_queue(struct sas_ha_struct *sas_ha)
 871 {
 872         struct scsi_core *core = &sas_ha->core;
 873         unsigned long flags;
 874         LIST_HEAD(q);
 875         int can_queue;
 876         int res;
 877         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 878
 879         spin_lock_irqsave(&core->task_queue_lock, flags);
 880         while (!kthread_should_stop() &&
 881                !list_empty(&core->task_queue)) {
 882
 883                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 884                 if (can_queue >= 0) {
 885                         can_queue = core->task_queue_size;
 886                         list_splice_init(&core->task_queue, &q);
 887                 } else {
 888                         struct list_head *a, *n;
 889
 890                         can_queue = sas_ha->lldd_queue_size;
 891                         list_for_each_safe(a, n, &core->task_queue) {
 892                                 list_move_tail(a, &q);
 893                                 if (--can_queue == 0)
 894                                         break;
 895                         }
 896                         can_queue = sas_ha->lldd_queue_size;
 897                 }
 898                 core->task_queue_size -= can_queue;
 899                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 900                 {
 901                         struct sas_task *task = list_entry(q.next,
 902                                                            struct sas_task,
 903                                                            list);
 904                         list_del_init(&q);
 905                         res = i->dft->lldd_execute_task(task, can_queue,
 906                                                         GFP_KERNEL);
 907                         if (unlikely(res))
 908                                 __list_add(&q, task->list.prev, &task->list);
 909                 }
 910                 spin_lock_irqsave(&core->task_queue_lock, flags);
 911                 if (res) {
 912                         list_splice_init(&q, &core->task_queue); /*at head*/
 913                         core->task_queue_size += can_queue;
 914                 }
 915         }
 916         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 917 }
 918
 919 /**
 920  * sas_queue_thread -- The Task Collector thread
 921  * @_sas_ha: pointer to struct sas_ha
 922  */
 923 static int sas_queue_thread(void *_sas_ha)
 924 {
 925         struct sas_ha_struct *sas_ha = _sas_ha;
 926
 927         while (1) {
 928                 set_current_state(TASK_INTERRUPTIBLE);
 929                 schedule();
 930                 sas_queue(sas_ha);
 931                 if (kthread_should_stop())
 932                         break;
 933         }
 934
 935         return 0;
 936 }
 937
 938 int sas_init_queue(struct sas_ha_struct *sas_ha)
 939 {
 940         struct scsi_core *core = &sas_ha->core;
 941
 942         spin_lock_init(&core->task_queue_lock);
 943         core->task_queue_size = 0;
 944         INIT_LIST_HEAD(&core->task_queue);
 945
 946         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 947                                          "sas_queue_%d", core->shost->host_no);
 948         if (IS_ERR(core->queue_thread))
 949                 return PTR_ERR(core->queue_thread);
 950         return 0;
 951 }
 952
 953 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 954 {
 955         unsigned long flags;
 956         struct scsi_core *core = &sas_ha->core;
 957         struct sas_task *task, *n;
 958
 959         kthread_stop(core->queue_thread);
 960
 961         if (!list_empty(&core->task_queue))
 962                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 963                             SAS_ADDR(sas_ha->sas_addr));
 964
 965         spin_lock_irqsave(&core->task_queue_lock, flags);
 966         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 967                 struct scsi_cmnd *cmd = task->uldd_task;
 968
 969                 list_del_init(&task->list);
 970
 971                 ASSIGN_SAS_TASK(cmd, NULL);
 972                 sas_free_task(task);
 973                 cmd->result = DID_ABORT << 16;
 974                 cmd->scsi_done(cmd);
 975         }
 976         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 977 }
 978
 979 /*
 980  * Call the LLDD task abort routine directly.  This function is intended for
 981  * use by upper layers that need to tell the LLDD to abort a task.
 982  */
 983 int __sas_task_abort(struct sas_task *task)
 984 {
 985         struct sas_internal *si =
 986                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 987         unsigned long flags;
 988         int res;
 989
 990         spin_lock_irqsave(&task->task_state_lock, flags);
 991         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 992             task->task_state_flags & SAS_TASK_STATE_DONE) {
 993                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 994                 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
 995                             task);
 996                 return 0;
 997         }
 998         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 999         spin_unlock_irqrestore(&task->task_state_lock, flags);
1000
1001         if (!si->dft->lldd_abort_task)
1002                 return -ENODEV;
1003
1004         res = si->dft->lldd_abort_task(task);
1005
1006         spin_lock_irqsave(&task->task_state_lock, flags);
1007         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1008             (res == TMF_RESP_FUNC_COMPLETE))
1009         {
1010                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1011                 task->task_done(task);
1012                 return 0;
1013         }
1014
1015         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1016                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1017         spin_unlock_irqrestore(&task->task_state_lock, flags);
1018
1019         return -EAGAIN;
1020 }
1021
1022 /*
1023  * Tell an upper layer that it needs to initiate an abort for a given task.
1024  * This should only ever be called by an LLDD.
1025  */
1026 void sas_task_abort(struct sas_task *task)
1027 {
1028         struct scsi_cmnd *sc = task->uldd_task;
1029
1030         /* Escape for libsas internal commands */
1031         if (!sc) {
1032                 if (!del_timer(&task->timer))
1033                         return;
1034                 task->timer.function(task->timer.data);
1035                 return;
1036         }
1037
1038         if (dev_is_sata(task->dev)) {
1039                 sas_ata_task_abort(task);
1040         } else {
1041                 struct request_queue *q = sc->device->request_queue;
1042                 unsigned long flags;
1043
1044                 spin_lock_irqsave(q->queue_lock, flags);
1045                 blk_abort_request(sc->request);
1046                 spin_unlock_irqrestore(q->queue_lock, flags);
1047                 scsi_schedule_eh(sc->device->host);
1048         }
1049 }
1050
1051 int sas_slave_alloc(struct scsi_device *scsi_dev)
1052 {
1053         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1054
1055         if (dev_is_sata(dev))
1056                 return ata_sas_port_init(dev->sata_dev.ap);
1057
1058         return 0;
1059 }
1060
1061 void sas_target_destroy(struct scsi_target *starget)
1062 {
1063         struct domain_device *found_dev = sas_find_target(starget);
1064
1065         if (!found_dev)
1066                 return;
1067
1068         if (dev_is_sata(found_dev))
1069                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1070
1071         return;
1072 }
1073
1074 static void sas_parse_addr(u8 *sas_addr, const char *p)
1075 {
1076         int i;
1077         for (i = 0; i < SAS_ADDR_SIZE; i++) {
1078                 u8 h, l;
1079                 if (!*p)
1080                         break;
1081                 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1082                 p++;
1083                 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1084                 p++;
1085                 sas_addr[i] = (h<<4) | l;
1086         }
1087 }
1088
1089 #define SAS_STRING_ADDR_SIZE    16
1090
1091 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1092 {
1093         int res;
1094         const struct firmware *fw;
1095
1096         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1097         if (res)
1098                 return res;
1099
1100         if (fw->size < SAS_STRING_ADDR_SIZE) {
1101                 res = -ENODEV;
1102                 goto out;
1103         }
1104
1105         sas_parse_addr(addr, fw->data);
1106
1107 out:
1108         release_firmware(fw);
1109         return res;
1110 }
1111 EXPORT_SYMBOL_GPL(sas_request_addr);
1112
1113 EXPORT_SYMBOL_GPL(sas_queuecommand);
1114 EXPORT_SYMBOL_GPL(sas_target_alloc);
1115 EXPORT_SYMBOL_GPL(sas_slave_configure);
1116 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1117 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1118 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1119 EXPORT_SYMBOL_GPL(sas_bios_param);
1120 EXPORT_SYMBOL_GPL(__sas_task_abort);
1121 EXPORT_SYMBOL_GPL(sas_task_abort);
1122 EXPORT_SYMBOL_GPL(sas_phy_reset);
1123 EXPORT_SYMBOL_GPL(sas_phy_enable);
1124 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1125 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1126 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1127 EXPORT_SYMBOL_GPL(sas_target_destroy);
1128 EXPORT_SYMBOL_GPL(sas_ioctl);