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