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
 123         if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
 124                 /* Aborted tasks will be completed by the error handler */
 125                 SAS_DPRINTK("task done but aborted\n");
 126                 return;
 127         }
 128
 129         if (unlikely(!sc)) {
 130                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
 131                 list_del_init(&task->list);
 132                 sas_free_task(task);
 133                 return;
 134         }
 135
 136         ASSIGN_SAS_TASK(sc, NULL);
 137         sas_end_task(sc, task);
 138         sc->scsi_done(sc);
 139 }
 140
 141 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 142                                                struct domain_device *dev,
 143                                                gfp_t gfp_flags)
 144 {
 145         struct sas_task *task = sas_alloc_task(gfp_flags);
 146         struct scsi_lun lun;
 147
 148         if (!task)
 149                 return NULL;
 150
 151         task->uldd_task = cmd;
 152         ASSIGN_SAS_TASK(cmd, task);
 153
 154         task->dev = dev;
 155         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 156
 157         task->ssp_task.retry_count = 1;
 158         int_to_scsilun(cmd->device->lun, &lun);
 159         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 160         task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
 161         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 162
 163         task->scatter = scsi_sglist(cmd);
 164         task->num_scatter = scsi_sg_count(cmd);
 165         task->total_xfer_len = scsi_bufflen(cmd);
 166         task->data_dir = cmd->sc_data_direction;
 167
 168         task->task_done = sas_scsi_task_done;
 169
 170         return task;
 171 }
 172
 173 int sas_queue_up(struct sas_task *task)
 174 {
 175         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 176         struct scsi_core *core = &sas_ha->core;
 177         unsigned long flags;
 178         LIST_HEAD(list);
 179
 180         spin_lock_irqsave(&core->task_queue_lock, flags);
 181         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 182                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 183                 return -SAS_QUEUE_FULL;
 184         }
 185         list_add_tail(&task->list, &core->task_queue);
 186         core->task_queue_size += 1;
 187         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 188         wake_up_process(core->queue_thread);
 189
 190         return 0;
 191 }
 192
 193 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 194 {
 195         struct sas_internal *i = to_sas_internal(host->transportt);
 196         struct domain_device *dev = cmd_to_domain_dev(cmd);
 197         struct sas_ha_struct *sas_ha = dev->port->ha;
 198         struct sas_task *task;
 199         int res = 0;
 200
 201         /* If the device fell off, no sense in issuing commands */
 202         if (dev->gone) {
 203                 cmd->result = DID_BAD_TARGET << 16;
 204                 goto out_done;
 205         }
 206
 207         if (dev_is_sata(dev)) {
 208                 unsigned long flags;
 209
 210                 spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 211                 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
 212                 spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 213                 return res;
 214         }
 215
 216         task = sas_create_task(cmd, dev, GFP_ATOMIC);
 217         if (!task)
 218                 return SCSI_MLQUEUE_HOST_BUSY;
 219
 220         /* Queue up, Direct Mode or Task Collector Mode. */
 221         if (sas_ha->lldd_max_execute_num < 2)
 222                 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 223         else
 224                 res = sas_queue_up(task);
 225
 226         if (res)
 227                 goto out_free_task;
 228         return 0;
 229
 230 out_free_task:
 231         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 232         ASSIGN_SAS_TASK(cmd, NULL);
 233         sas_free_task(task);
 234         if (res == -SAS_QUEUE_FULL)
 235                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 236         else
 237                 cmd->result = DID_ERROR << 16;
 238 out_done:
 239         cmd->scsi_done(cmd);
 240         return 0;
 241 }
 242
 243 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
 244 {
 245         struct sas_task *task = TO_SAS_TASK(cmd);
 246         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
 247
 248         /* At this point, we only get called following an actual abort
 249          * of the task, so we should be guaranteed not to be racing with
 250          * any completions from the LLD.  Task is freed after this.
 251          */
 252         sas_end_task(cmd, task);
 253
 254         /* now finish the command and move it on to the error
 255          * handler done list, this also takes it off the
 256          * error handler pending list.
 257          */
 258         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
 259 }
 260
 261 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 262 {
 263         struct scsi_cmnd *cmd, *n;
 264
 265         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 266                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
 267                     cmd->device->lun == my_cmd->device->lun)
 268                         sas_eh_finish_cmd(cmd);
 269         }
 270 }
 271
 272 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 273                                      struct domain_device *dev)
 274 {
 275         struct scsi_cmnd *cmd, *n;
 276
 277         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 278                 struct domain_device *x = cmd_to_domain_dev(cmd);
 279
 280                 if (x == dev)
 281                         sas_eh_finish_cmd(cmd);
 282         }
 283 }
 284
 285 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 286                                       struct asd_sas_port *port)
 287 {
 288         struct scsi_cmnd *cmd, *n;
 289
 290         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 291                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 292                 struct asd_sas_port *x = dev->port;
 293
 294                 if (x == port)
 295                         sas_eh_finish_cmd(cmd);
 296         }
 297 }
 298
 299 enum task_disposition {
 300         TASK_IS_DONE,
 301         TASK_IS_ABORTED,
 302         TASK_IS_AT_LU,
 303         TASK_IS_NOT_AT_LU,
 304         TASK_ABORT_FAILED,
 305 };
 306
 307 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 308 {
 309         struct sas_ha_struct *ha = task->dev->port->ha;
 310         unsigned long flags;
 311         int i, res;
 312         struct sas_internal *si =
 313                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 314
 315         if (ha->lldd_max_execute_num > 1) {
 316                 struct scsi_core *core = &ha->core;
 317                 struct sas_task *t, *n;
 318
 319                 spin_lock_irqsave(&core->task_queue_lock, flags);
 320                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 321                         if (task == t) {
 322                                 list_del_init(&t->list);
 323                                 spin_unlock_irqrestore(&core->task_queue_lock,
 324                                                        flags);
 325                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 326                                             "task_queue\n",
 327                                             __func__, task);
 328                                 return TASK_IS_ABORTED;
 329                         }
 330                 }
 331                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 332         }
 333
 334         for (i = 0; i < 5; i++) {
 335                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
 336                 res = si->dft->lldd_abort_task(task);
 337
 338                 spin_lock_irqsave(&task->task_state_lock, flags);
 339                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 340                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 341                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 342                                     task);
 343                         return TASK_IS_DONE;
 344                 }
 345                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 346
 347                 if (res == TMF_RESP_FUNC_COMPLETE) {
 348                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 349                                     __func__, task);
 350                         return TASK_IS_ABORTED;
 351                 } else if (si->dft->lldd_query_task) {
 352                         SAS_DPRINTK("%s: querying task 0x%p\n",
 353                                     __func__, task);
 354                         res = si->dft->lldd_query_task(task);
 355                         switch (res) {
 356                         case TMF_RESP_FUNC_SUCC:
 357                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 358                                             __func__, task);
 359                                 return TASK_IS_AT_LU;
 360                         case TMF_RESP_FUNC_COMPLETE:
 361                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 362                                             __func__, task);
 363                                 return TASK_IS_NOT_AT_LU;
 364                         case TMF_RESP_FUNC_FAILED:
 365                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 366                                                 __func__, task);
 367                                 return TASK_ABORT_FAILED;
 368                         }
 369
 370                 }
 371         }
 372         return res;
 373 }
 374
 375 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 376 {
 377         int res = TMF_RESP_FUNC_FAILED;
 378         struct scsi_lun lun;
 379         struct sas_internal *i =
 380                 to_sas_internal(dev->port->ha->core.shost->transportt);
 381
 382         int_to_scsilun(cmd->device->lun, &lun);
 383
 384         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 385                     SAS_ADDR(dev->sas_addr),
 386                     cmd->device->lun);
 387
 388         if (i->dft->lldd_abort_task_set)
 389                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 390
 391         if (res == TMF_RESP_FUNC_FAILED) {
 392                 if (i->dft->lldd_clear_task_set)
 393                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 394         }
 395
 396         if (res == TMF_RESP_FUNC_FAILED) {
 397                 if (i->dft->lldd_lu_reset)
 398                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 399         }
 400
 401         return res;
 402 }
 403
 404 static int sas_recover_I_T(struct domain_device *dev)
 405 {
 406         int res = TMF_RESP_FUNC_FAILED;
 407         struct sas_internal *i =
 408                 to_sas_internal(dev->port->ha->core.shost->transportt);
 409
 410         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 411                     SAS_ADDR(dev->sas_addr));
 412
 413         if (i->dft->lldd_I_T_nexus_reset)
 414                 res = i->dft->lldd_I_T_nexus_reset(dev);
 415
 416         return res;
 417 }
 418
 419 /* Find the sas_phy that's attached to this device */
 420 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
 421 {
 422         struct domain_device *pdev = dev->parent;
 423         struct ex_phy *exphy = NULL;
 424         int i;
 425
 426         /* Directly attached device */
 427         if (!pdev)
 428                 return dev->port->phy;
 429
 430         /* Otherwise look in the expander */
 431         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 432                 if (!memcmp(dev->sas_addr,
 433                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 434                             SAS_ADDR_SIZE)) {
 435                         exphy = &pdev->ex_dev.ex_phy[i];
 436                         break;
 437                 }
 438
 439         BUG_ON(!exphy);
 440         return exphy->phy;
 441 }
 442 EXPORT_SYMBOL_GPL(sas_find_local_phy);
 443
 444 /* Attempt to send a LUN reset message to a device */
 445 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 446 {
 447         struct domain_device *dev = cmd_to_domain_dev(cmd);
 448         struct sas_internal *i =
 449                 to_sas_internal(dev->port->ha->core.shost->transportt);
 450         struct scsi_lun lun;
 451         int res;
 452
 453         int_to_scsilun(cmd->device->lun, &lun);
 454
 455         if (!i->dft->lldd_lu_reset)
 456                 return FAILED;
 457
 458         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 459         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 460                 return SUCCESS;
 461
 462         return FAILED;
 463 }
 464
 465 /* Attempt to send a phy (bus) reset */
 466 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 467 {
 468         struct domain_device *dev = cmd_to_domain_dev(cmd);
 469         struct sas_phy *phy = sas_find_local_phy(dev);
 470         int res;
 471
 472         res = sas_phy_reset(phy, 1);
 473         if (res)
 474                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 475                             kobject_name(&phy->dev.kobj),
 476                             res);
 477         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 478                 return SUCCESS;
 479
 480         return FAILED;
 481 }
 482
 483 /* Try to reset a device */
 484 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
 485 {
 486         int res;
 487         struct Scsi_Host *shost = cmd->device->host;
 488
 489         if (!shost->hostt->eh_device_reset_handler)
 490                 goto try_bus_reset;
 491
 492         res = shost->hostt->eh_device_reset_handler(cmd);
 493         if (res == SUCCESS)
 494                 return res;
 495
 496 try_bus_reset:
 497         if (shost->hostt->eh_bus_reset_handler)
 498                 return shost->hostt->eh_bus_reset_handler(cmd);
 499
 500         return FAILED;
 501 }
 502
 503 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 504                                     struct list_head *work_q,
 505                                     struct list_head *done_q)
 506 {
 507         struct scsi_cmnd *cmd, *n;
 508         enum task_disposition res = TASK_IS_DONE;
 509         int tmf_resp, need_reset;
 510         struct sas_internal *i = to_sas_internal(shost->transportt);
 511         unsigned long flags;
 512         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 513
 514 Again:
 515         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 516                 struct sas_task *task = TO_SAS_TASK(cmd);
 517
 518                 if (!task)
 519                         continue;
 520
 521                 list_del_init(&cmd->eh_entry);
 522
 523                 spin_lock_irqsave(&task->task_state_lock, flags);
 524                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 525                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 526
 527                 if (need_reset) {
 528                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
 529                                     __func__, task);
 530                         goto reset;
 531                 }
 532
 533                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 534                 res = sas_scsi_find_task(task);
 535
 536                 cmd->eh_eflags = 0;
 537
 538                 switch (res) {
 539                 case TASK_IS_DONE:
 540                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 541                                     task);
 542                         sas_eh_finish_cmd(cmd);
 543                         continue;
 544                 case TASK_IS_ABORTED:
 545                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 546                                     __func__, task);
 547                         sas_eh_finish_cmd(cmd);
 548                         continue;
 549                 case TASK_IS_AT_LU:
 550                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 551  reset:
 552                         tmf_resp = sas_recover_lu(task->dev, cmd);
 553                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 554                                 SAS_DPRINTK("dev %016llx LU %x is "
 555                                             "recovered\n",
 556                                             SAS_ADDR(task->dev),
 557                                             cmd->device->lun);
 558                                 sas_eh_finish_cmd(cmd);
 559                                 sas_scsi_clear_queue_lu(work_q, cmd);
 560                                 goto Again;
 561                         }
 562                         /* fallthrough */
 563                 case TASK_IS_NOT_AT_LU:
 564                 case TASK_ABORT_FAILED:
 565                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 566                                     task);
 567                         tmf_resp = sas_recover_I_T(task->dev);
 568                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 569                                 struct domain_device *dev = task->dev;
 570                                 SAS_DPRINTK("I_T %016llx recovered\n",
 571                                             SAS_ADDR(task->dev->sas_addr));
 572                                 sas_eh_finish_cmd(cmd);
 573                                 sas_scsi_clear_queue_I_T(work_q, dev);
 574                                 goto Again;
 575                         }
 576                         /* Hammer time :-) */
 577                         try_to_reset_cmd_device(cmd);
 578                         if (i->dft->lldd_clear_nexus_port) {
 579                                 struct asd_sas_port *port = task->dev->port;
 580                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 581                                             port->id);
 582                                 res = i->dft->lldd_clear_nexus_port(port);
 583                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 584                                         SAS_DPRINTK("clear nexus port:%d "
 585                                                     "succeeded\n", port->id);
 586                                         sas_eh_finish_cmd(cmd);
 587                                         sas_scsi_clear_queue_port(work_q,
 588                                                                   port);
 589                                         goto Again;
 590                                 }
 591                         }
 592                         if (i->dft->lldd_clear_nexus_ha) {
 593                                 SAS_DPRINTK("clear nexus ha\n");
 594                                 res = i->dft->lldd_clear_nexus_ha(ha);
 595                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 596                                         SAS_DPRINTK("clear nexus ha "
 597                                                     "succeeded\n");
 598                                         sas_eh_finish_cmd(cmd);
 599                                         goto clear_q;
 600                                 }
 601                         }
 602                         /* If we are here -- this means that no amount
 603                          * of effort could recover from errors.  Quite
 604                          * possibly the HA just disappeared.
 605                          */
 606                         SAS_DPRINTK("error from  device %llx, LUN %x "
 607                                     "couldn't be recovered in any way\n",
 608                                     SAS_ADDR(task->dev->sas_addr),
 609                                     cmd->device->lun);
 610
 611                         sas_eh_finish_cmd(cmd);
 612                         goto clear_q;
 613                 }
 614         }
 615         return list_empty(work_q);
 616 clear_q:
 617         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
 618         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 619                 sas_eh_finish_cmd(cmd);
 620
 621         return list_empty(work_q);
 622 }
 623
 624 void sas_scsi_recover_host(struct Scsi_Host *shost)
 625 {
 626         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 627         unsigned long flags;
 628         LIST_HEAD(eh_work_q);
 629
 630         spin_lock_irqsave(shost->host_lock, flags);
 631         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 632         shost->host_eh_scheduled = 0;
 633         spin_unlock_irqrestore(shost->host_lock, flags);
 634
 635         SAS_DPRINTK("Enter %s\n", __func__);
 636         /*
 637          * Deal with commands that still have SAS tasks (i.e. they didn't
 638          * complete via the normal sas_task completion mechanism)
 639          */
 640         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 641                 goto out;
 642
 643         /*
 644          * Now deal with SCSI commands that completed ok but have a an error
 645          * code (and hopefully sense data) attached.  This is roughly what
 646          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 647          * command we see here has no sas_task and is thus unknown to the HA.
 648          */
 649         if (!sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q))
 650                 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 651                         scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 652
 653 out:
 654         /* now link into libata eh --- if we have any ata devices */
 655         sas_ata_strategy_handler(shost);
 656
 657         scsi_eh_flush_done_q(&ha->eh_done_q);
 658
 659         SAS_DPRINTK("--- Exit %s\n", __func__);
 660         return;
 661 }
 662
 663 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 664 {
 665         struct sas_task *task = TO_SAS_TASK(cmd);
 666         unsigned long flags;
 667         enum blk_eh_timer_return rtn;
 668
 669         if (sas_ata_timed_out(cmd, task, &rtn))
 670                 return rtn;
 671
 672         if (!task) {
 673                 cmd->request->timeout /= 2;
 674                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 675                             cmd, task, (cmd->request->timeout ?
 676                             "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
 677                 if (!cmd->request->timeout)
 678                         return BLK_EH_NOT_HANDLED;
 679                 return BLK_EH_RESET_TIMER;
 680         }
 681
 682         spin_lock_irqsave(&task->task_state_lock, flags);
 683         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 684         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 685                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 686                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
 687                             "BLK_EH_HANDLED\n", cmd, task);
 688                 return BLK_EH_HANDLED;
 689         }
 690         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 691                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 692                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 693                             "BLK_EH_RESET_TIMER\n",
 694                             cmd, task);
 695                 return BLK_EH_RESET_TIMER;
 696         }
 697         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 698         spin_unlock_irqrestore(&task->task_state_lock, flags);
 699
 700         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
 701                     cmd, task);
 702
 703         return BLK_EH_NOT_HANDLED;
 704 }
 705
 706 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 707 {
 708         struct domain_device *dev = sdev_to_domain_dev(sdev);
 709
 710         if (dev_is_sata(dev))
 711                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
 712
 713         return -EINVAL;
 714 }
 715
 716 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 717 {
 718         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 719         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 720         struct domain_device *found_dev = NULL;
 721         int i;
 722         unsigned long flags;
 723
 724         spin_lock_irqsave(&ha->phy_port_lock, flags);
 725         for (i = 0; i < ha->num_phys; i++) {
 726                 struct asd_sas_port *port = ha->sas_port[i];
 727                 struct domain_device *dev;
 728
 729                 spin_lock(&port->dev_list_lock);
 730                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 731                         if (rphy == dev->rphy) {
 732                                 found_dev = dev;
 733                                 spin_unlock(&port->dev_list_lock);
 734                                 goto found;
 735                         }
 736                 }
 737                 spin_unlock(&port->dev_list_lock);
 738         }
 739  found:
 740         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 741
 742         return found_dev;
 743 }
 744
 745 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 746 {
 747         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 748
 749         return sas_find_dev_by_rphy(rphy);
 750 }
 751
 752 int sas_target_alloc(struct scsi_target *starget)
 753 {
 754         struct domain_device *found_dev = sas_find_target(starget);
 755         int res;
 756
 757         if (!found_dev)
 758                 return -ENODEV;
 759
 760         if (dev_is_sata(found_dev)) {
 761                 res = sas_ata_init_host_and_port(found_dev, starget);
 762                 if (res)
 763                         return res;
 764         }
 765
 766         starget->hostdata = found_dev;
 767         return 0;
 768 }
 769
 770 #define SAS_DEF_QD 256
 771
 772 int sas_slave_configure(struct scsi_device *scsi_dev)
 773 {
 774         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 775         struct sas_ha_struct *sas_ha;
 776
 777         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 778
 779         if (dev_is_sata(dev)) {
 780                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 781                 return 0;
 782         }
 783
 784         sas_ha = dev->port->ha;
 785
 786         sas_read_port_mode_page(scsi_dev);
 787
 788         if (scsi_dev->tagged_supported) {
 789                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 790                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 791         } else {
 792                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 793                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 794                             scsi_dev->lun);
 795                 scsi_dev->tagged_supported = 0;
 796                 scsi_set_tag_type(scsi_dev, 0);
 797                 scsi_deactivate_tcq(scsi_dev, 1);
 798         }
 799
 800         scsi_dev->allow_restart = 1;
 801
 802         return 0;
 803 }
 804
 805 void sas_slave_destroy(struct scsi_device *scsi_dev)
 806 {
 807         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 808
 809         if (dev_is_sata(dev))
 810                 sas_to_ata_dev(dev)->class = ATA_DEV_NONE;
 811 }
 812
 813 int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
 814 {
 815         struct domain_device *dev = sdev_to_domain_dev(sdev);
 816
 817         if (dev_is_sata(dev))
 818                 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
 819                                                 reason);
 820
 821         switch (reason) {
 822         case SCSI_QDEPTH_DEFAULT:
 823         case SCSI_QDEPTH_RAMP_UP:
 824                 if (!sdev->tagged_supported)
 825                         depth = 1;
 826                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
 827                 break;
 828         case SCSI_QDEPTH_QFULL:
 829                 scsi_track_queue_full(sdev, depth);
 830                 break;
 831         default:
 832                 return -EOPNOTSUPP;
 833         }
 834
 835         return depth;
 836 }
 837
 838 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 839 {
 840         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 841
 842         if (dev_is_sata(dev))
 843                 return -EINVAL;
 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);