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