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
  28 #include "sas_internal.h"
  29
  30 #include <scsi/scsi_host.h>
  31 #include <scsi/scsi_device.h>
  32 #include <scsi/scsi_tcq.h>
  33 #include <scsi/scsi.h>
  34 #include <scsi/scsi_eh.h>
  35 #include <scsi/scsi_transport.h>
  36 #include <scsi/scsi_transport_sas.h>
  37 #include <scsi/sas_ata.h>
  38 #include "../scsi_sas_internal.h"
  39 #include "../scsi_transport_api.h"
  40 #include "../scsi_priv.h"
  41
  42 #include <linux/err.h>
  43 #include <linux/blkdev.h>
  44 #include <linux/freezer.h>
  45 #include <linux/scatterlist.h>
  46 #include <linux/libata.h>
  47
  48 /* ---------- SCSI Host glue ---------- */
  49
  50 #define TO_SAS_TASK(_scsi_cmd)  ((void *)(_scsi_cmd)->host_scribble)
  51 #define ASSIGN_SAS_TASK(_sc, _t) do { (_sc)->host_scribble = (void *) _t; } while (0)
  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         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(sc->device->host);
  58         unsigned ts_flags = task->task_state_flags;
  59         int hs = 0, stat = 0;
  60
  61         if (unlikely(!sc)) {
  62                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  63                 list_del_init(&task->list);
  64                 sas_free_task(task);
  65                 return;
  66         }
  67
  68         if (ts->resp == SAS_TASK_UNDELIVERED) {
  69                 /* transport error */
  70                 hs = DID_NO_CONNECT;
  71         } else { /* ts->resp == SAS_TASK_COMPLETE */
  72                 /* task delivered, what happened afterwards? */
  73                 switch (ts->stat) {
  74                 case SAS_DEV_NO_RESPONSE:
  75                 case SAS_INTERRUPTED:
  76                 case SAS_PHY_DOWN:
  77                 case SAS_NAK_R_ERR:
  78                 case SAS_OPEN_TO:
  79                         hs = DID_NO_CONNECT;
  80                         break;
  81                 case SAS_DATA_UNDERRUN:
  82                         scsi_set_resid(sc, ts->residual);
  83                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  84                                 hs = DID_ERROR;
  85                         break;
  86                 case SAS_DATA_OVERRUN:
  87                         hs = DID_ERROR;
  88                         break;
  89                 case SAS_QUEUE_FULL:
  90                         hs = DID_SOFT_ERROR; /* retry */
  91                         break;
  92                 case SAS_DEVICE_UNKNOWN:
  93                         hs = DID_BAD_TARGET;
  94                         break;
  95                 case SAS_SG_ERR:
  96                         hs = DID_PARITY;
  97                         break;
  98                 case SAS_OPEN_REJECT:
  99                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
 100                                 hs = DID_SOFT_ERROR; /* retry */
 101                         else
 102                                 hs = DID_ERROR;
 103                         break;
 104                 case SAS_PROTO_RESPONSE:
 105                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
 106                                     "task; please report this\n",
 107                                     task->dev->port->ha->sas_ha_name);
 108                         break;
 109                 case SAS_ABORTED_TASK:
 110                         hs = DID_ABORT;
 111                         break;
 112                 case SAM_CHECK_COND:
 113                         memcpy(sc->sense_buffer, ts->buf,
 114                                max(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 115                         stat = SAM_CHECK_COND;
 116                         break;
 117                 default:
 118                         stat = ts->stat;
 119                         break;
 120                 }
 121         }
 122         ASSIGN_SAS_TASK(sc, NULL);
 123         sc->result = (hs << 16) | stat;
 124         list_del_init(&task->list);
 125         sas_free_task(task);
 126         /* This is very ugly but this is how SCSI Core works. */
 127         if (ts_flags & SAS_TASK_STATE_ABORTED)
 128                 scsi_eh_finish_cmd(sc, &sas_ha->eh_done_q);
 129         else
 130                 sc->scsi_done(sc);
 131 }
 132
 133 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
 134 {
 135         enum task_attribute ta = TASK_ATTR_SIMPLE;
 136         if (cmd->request && blk_rq_tagged(cmd->request)) {
 137                 if (cmd->device->ordered_tags &&
 138                     (cmd->request->cmd_flags & REQ_HARDBARRIER))
 139                         ta = TASK_ATTR_ORDERED;
 140         }
 141         return ta;
 142 }
 143
 144 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 145                                                struct domain_device *dev,
 146                                                gfp_t gfp_flags)
 147 {
 148         struct sas_task *task = sas_alloc_task(gfp_flags);
 149         struct scsi_lun lun;
 150
 151         if (!task)
 152                 return NULL;
 153
 154         *(u32 *)cmd->sense_buffer = 0;
 155         task->uldd_task = cmd;
 156         ASSIGN_SAS_TASK(cmd, task);
 157
 158         task->dev = dev;
 159         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 160
 161         task->ssp_task.retry_count = 1;
 162         int_to_scsilun(cmd->device->lun, &lun);
 163         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 164         task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
 165         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 166
 167         task->scatter = scsi_sglist(cmd);
 168         task->num_scatter = scsi_sg_count(cmd);
 169         task->total_xfer_len = scsi_bufflen(cmd);
 170         task->data_dir = cmd->sc_data_direction;
 171
 172         task->task_done = sas_scsi_task_done;
 173
 174         return task;
 175 }
 176
 177 int sas_queue_up(struct sas_task *task)
 178 {
 179         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 180         struct scsi_core *core = &sas_ha->core;
 181         unsigned long flags;
 182         LIST_HEAD(list);
 183
 184         spin_lock_irqsave(&core->task_queue_lock, flags);
 185         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 186                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 187                 return -SAS_QUEUE_FULL;
 188         }
 189         list_add_tail(&task->list, &core->task_queue);
 190         core->task_queue_size += 1;
 191         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 192         wake_up_process(core->queue_thread);
 193
 194         return 0;
 195 }
 196
 197 /**
 198  * sas_queuecommand -- Enqueue a command for processing
 199  * @parameters: See SCSI Core documentation
 200  *
 201  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
 202  * call us without holding an IRQ spinlock...
 203  */
 204 int sas_queuecommand(struct scsi_cmnd *cmd,
 205                      void (*scsi_done)(struct scsi_cmnd *))
 206 {
 207         int res = 0;
 208         struct domain_device *dev = cmd_to_domain_dev(cmd);
 209         struct Scsi_Host *host = cmd->device->host;
 210         struct sas_internal *i = to_sas_internal(host->transportt);
 211
 212         spin_unlock_irq(host->host_lock);
 213
 214         {
 215                 struct sas_ha_struct *sas_ha = dev->port->ha;
 216                 struct sas_task *task;
 217
 218                 if (dev_is_sata(dev)) {
 219                         res = ata_sas_queuecmd(cmd, scsi_done,
 220                                                dev->sata_dev.ap);
 221                         goto out;
 222                 }
 223
 224                 res = -ENOMEM;
 225                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
 226                 if (!task)
 227                         goto out;
 228
 229                 cmd->scsi_done = scsi_done;
 230                 /* Queue up, Direct Mode or Task Collector Mode. */
 231                 if (sas_ha->lldd_max_execute_num < 2)
 232                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 233                 else
 234                         res = sas_queue_up(task);
 235
 236                 /* Examine */
 237                 if (res) {
 238                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 239                         ASSIGN_SAS_TASK(cmd, NULL);
 240                         sas_free_task(task);
 241                         if (res == -SAS_QUEUE_FULL) {
 242                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 243                                 res = 0;
 244                                 scsi_done(cmd);
 245                         }
 246                         goto out;
 247                 }
 248         }
 249 out:
 250         spin_lock_irq(host->host_lock);
 251         return res;
 252 }
 253
 254 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 255 {
 256         struct scsi_cmnd *cmd, *n;
 257
 258         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 259                 if (cmd == my_cmd)
 260                         list_del_init(&cmd->eh_entry);
 261         }
 262 }
 263
 264 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 265                                      struct domain_device *dev)
 266 {
 267         struct scsi_cmnd *cmd, *n;
 268
 269         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 270                 struct domain_device *x = cmd_to_domain_dev(cmd);
 271
 272                 if (x == dev)
 273                         list_del_init(&cmd->eh_entry);
 274         }
 275 }
 276
 277 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 278                                       struct asd_sas_port *port)
 279 {
 280         struct scsi_cmnd *cmd, *n;
 281
 282         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 283                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 284                 struct asd_sas_port *x = dev->port;
 285
 286                 if (x == port)
 287                         list_del_init(&cmd->eh_entry);
 288         }
 289 }
 290
 291 enum task_disposition {
 292         TASK_IS_DONE,
 293         TASK_IS_ABORTED,
 294         TASK_IS_AT_LU,
 295         TASK_IS_NOT_AT_LU,
 296         TASK_ABORT_FAILED,
 297 };
 298
 299 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 300 {
 301         struct sas_ha_struct *ha = task->dev->port->ha;
 302         unsigned long flags;
 303         int i, res;
 304         struct sas_internal *si =
 305                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 306
 307         if (ha->lldd_max_execute_num > 1) {
 308                 struct scsi_core *core = &ha->core;
 309                 struct sas_task *t, *n;
 310
 311                 spin_lock_irqsave(&core->task_queue_lock, flags);
 312                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 313                         if (task == t) {
 314                                 list_del_init(&t->list);
 315                                 spin_unlock_irqrestore(&core->task_queue_lock,
 316                                                        flags);
 317                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 318                                             "task_queue\n",
 319                                             __FUNCTION__, task);
 320                                 return TASK_IS_ABORTED;
 321                         }
 322                 }
 323                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 324         }
 325
 326         for (i = 0; i < 5; i++) {
 327                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 328                 res = si->dft->lldd_abort_task(task);
 329
 330                 spin_lock_irqsave(&task->task_state_lock, flags);
 331                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 332                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 333                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 334                                     task);
 335                         return TASK_IS_DONE;
 336                 }
 337                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 338
 339                 if (res == TMF_RESP_FUNC_COMPLETE) {
 340                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 341                                     __FUNCTION__, task);
 342                         return TASK_IS_ABORTED;
 343                 } else if (si->dft->lldd_query_task) {
 344                         SAS_DPRINTK("%s: querying task 0x%p\n",
 345                                     __FUNCTION__, task);
 346                         res = si->dft->lldd_query_task(task);
 347                         switch (res) {
 348                         case TMF_RESP_FUNC_SUCC:
 349                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 350                                             __FUNCTION__, task);
 351                                 return TASK_IS_AT_LU;
 352                         case TMF_RESP_FUNC_COMPLETE:
 353                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 354                                             __FUNCTION__, task);
 355                                 return TASK_IS_NOT_AT_LU;
 356                         case TMF_RESP_FUNC_FAILED:
 357                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 358                                                 __FUNCTION__, task);
 359                                 return TASK_ABORT_FAILED;
 360                         }
 361
 362                 }
 363         }
 364         return res;
 365 }
 366
 367 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 368 {
 369         int res = TMF_RESP_FUNC_FAILED;
 370         struct scsi_lun lun;
 371         struct sas_internal *i =
 372                 to_sas_internal(dev->port->ha->core.shost->transportt);
 373
 374         int_to_scsilun(cmd->device->lun, &lun);
 375
 376         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 377                     SAS_ADDR(dev->sas_addr),
 378                     cmd->device->lun);
 379
 380         if (i->dft->lldd_abort_task_set)
 381                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 382
 383         if (res == TMF_RESP_FUNC_FAILED) {
 384                 if (i->dft->lldd_clear_task_set)
 385                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 386         }
 387
 388         if (res == TMF_RESP_FUNC_FAILED) {
 389                 if (i->dft->lldd_lu_reset)
 390                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 391         }
 392
 393         return res;
 394 }
 395
 396 static int sas_recover_I_T(struct domain_device *dev)
 397 {
 398         int res = TMF_RESP_FUNC_FAILED;
 399         struct sas_internal *i =
 400                 to_sas_internal(dev->port->ha->core.shost->transportt);
 401
 402         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 403                     SAS_ADDR(dev->sas_addr));
 404
 405         if (i->dft->lldd_I_T_nexus_reset)
 406                 res = i->dft->lldd_I_T_nexus_reset(dev);
 407
 408         return res;
 409 }
 410
 411 /* Find the sas_phy that's attached to this device */
 412 struct sas_phy *find_local_sas_phy(struct domain_device *dev)
 413 {
 414         struct domain_device *pdev = dev->parent;
 415         struct ex_phy *exphy = NULL;
 416         int i;
 417
 418         /* Directly attached device */
 419         if (!pdev)
 420                 return dev->port->phy;
 421
 422         /* Otherwise look in the expander */
 423         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 424                 if (!memcmp(dev->sas_addr,
 425                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 426                             SAS_ADDR_SIZE)) {
 427                         exphy = &pdev->ex_dev.ex_phy[i];
 428                         break;
 429                 }
 430
 431         BUG_ON(!exphy);
 432         return exphy->phy;
 433 }
 434
 435 /* Attempt to send a LUN reset message to a device */
 436 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 437 {
 438         struct domain_device *dev = cmd_to_domain_dev(cmd);
 439         struct sas_internal *i =
 440                 to_sas_internal(dev->port->ha->core.shost->transportt);
 441         struct scsi_lun lun;
 442         int res;
 443
 444         int_to_scsilun(cmd->device->lun, &lun);
 445
 446         if (!i->dft->lldd_lu_reset)
 447                 return FAILED;
 448
 449         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 450         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 451                 return SUCCESS;
 452
 453         return FAILED;
 454 }
 455
 456 /* Attempt to send a phy (bus) reset */
 457 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 458 {
 459         struct domain_device *dev = cmd_to_domain_dev(cmd);
 460         struct sas_phy *phy = find_local_sas_phy(dev);
 461         int res;
 462
 463         res = sas_phy_reset(phy, 1);
 464         if (res)
 465                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 466                             phy->dev.kobj.k_name,
 467                             res);
 468         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 469                 return SUCCESS;
 470
 471         return FAILED;
 472 }
 473
 474 /* Try to reset a device */
 475 static int try_to_reset_cmd_device(struct Scsi_Host *shost,
 476                                    struct scsi_cmnd *cmd)
 477 {
 478         int res;
 479
 480         if (!shost->hostt->eh_device_reset_handler)
 481                 goto try_bus_reset;
 482
 483         res = shost->hostt->eh_device_reset_handler(cmd);
 484         if (res == SUCCESS)
 485                 return res;
 486
 487 try_bus_reset:
 488         if (shost->hostt->eh_bus_reset_handler)
 489                 return shost->hostt->eh_bus_reset_handler(cmd);
 490
 491         return FAILED;
 492 }
 493
 494 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 495                                     struct list_head *work_q,
 496                                     struct list_head *done_q)
 497 {
 498         struct scsi_cmnd *cmd, *n;
 499         enum task_disposition res = TASK_IS_DONE;
 500         int tmf_resp, need_reset;
 501         struct sas_internal *i = to_sas_internal(shost->transportt);
 502         unsigned long flags;
 503         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 504
 505 Again:
 506         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 507                 struct sas_task *task = TO_SAS_TASK(cmd);
 508
 509                 if (!task)
 510                         continue;
 511
 512                 list_del_init(&cmd->eh_entry);
 513
 514                 spin_lock_irqsave(&task->task_state_lock, flags);
 515                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 516                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 517
 518                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 519                 res = sas_scsi_find_task(task);
 520
 521                 cmd->eh_eflags = 0;
 522
 523                 switch (res) {
 524                 case TASK_IS_DONE:
 525                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 526                                     task);
 527                         task->task_done(task);
 528                         if (need_reset)
 529                                 try_to_reset_cmd_device(shost, cmd);
 530                         continue;
 531                 case TASK_IS_ABORTED:
 532                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 533                                     __FUNCTION__, task);
 534                         task->task_done(task);
 535                         if (need_reset)
 536                                 try_to_reset_cmd_device(shost, cmd);
 537                         continue;
 538                 case TASK_IS_AT_LU:
 539                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 540                         tmf_resp = sas_recover_lu(task->dev, cmd);
 541                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 542                                 SAS_DPRINTK("dev %016llx LU %x is "
 543                                             "recovered\n",
 544                                             SAS_ADDR(task->dev),
 545                                             cmd->device->lun);
 546                                 task->task_done(task);
 547                                 if (need_reset)
 548                                         try_to_reset_cmd_device(shost, cmd);
 549                                 sas_scsi_clear_queue_lu(work_q, cmd);
 550                                 goto Again;
 551                         }
 552                         /* fallthrough */
 553                 case TASK_IS_NOT_AT_LU:
 554                 case TASK_ABORT_FAILED:
 555                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 556                                     task);
 557                         tmf_resp = sas_recover_I_T(task->dev);
 558                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 559                                 SAS_DPRINTK("I_T %016llx recovered\n",
 560                                             SAS_ADDR(task->dev->sas_addr));
 561                                 task->task_done(task);
 562                                 if (need_reset)
 563                                         try_to_reset_cmd_device(shost, cmd);
 564                                 sas_scsi_clear_queue_I_T(work_q, task->dev);
 565                                 goto Again;
 566                         }
 567                         /* Hammer time :-) */
 568                         if (i->dft->lldd_clear_nexus_port) {
 569                                 struct asd_sas_port *port = task->dev->port;
 570                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 571                                             port->id);
 572                                 res = i->dft->lldd_clear_nexus_port(port);
 573                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 574                                         SAS_DPRINTK("clear nexus port:%d "
 575                                                     "succeeded\n", port->id);
 576                                         task->task_done(task);
 577                                         if (need_reset)
 578                                                 try_to_reset_cmd_device(shost, cmd);
 579                                         sas_scsi_clear_queue_port(work_q,
 580                                                                   port);
 581                                         goto Again;
 582                                 }
 583                         }
 584                         if (i->dft->lldd_clear_nexus_ha) {
 585                                 SAS_DPRINTK("clear nexus ha\n");
 586                                 res = i->dft->lldd_clear_nexus_ha(ha);
 587                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 588                                         SAS_DPRINTK("clear nexus ha "
 589                                                     "succeeded\n");
 590                                         task->task_done(task);
 591                                         if (need_reset)
 592                                                 try_to_reset_cmd_device(shost, cmd);
 593                                         goto out;
 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                         task->task_done(task);
 606                         if (need_reset)
 607                                 try_to_reset_cmd_device(shost, cmd);
 608                         goto clear_q;
 609                 }
 610         }
 611 out:
 612         return list_empty(work_q);
 613 clear_q:
 614         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 615         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 616                 struct sas_task *task = TO_SAS_TASK(cmd);
 617                 list_del_init(&cmd->eh_entry);
 618                 task->task_done(task);
 619         }
 620         return list_empty(work_q);
 621 }
 622
 623 void sas_scsi_recover_host(struct Scsi_Host *shost)
 624 {
 625         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 626         unsigned long flags;
 627         LIST_HEAD(eh_work_q);
 628
 629         spin_lock_irqsave(shost->host_lock, flags);
 630         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 631         spin_unlock_irqrestore(shost->host_lock, flags);
 632
 633         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 634         /*
 635          * Deal with commands that still have SAS tasks (i.e. they didn't
 636          * complete via the normal sas_task completion mechanism)
 637          */
 638         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 639                 goto out;
 640
 641         /*
 642          * Now deal with SCSI commands that completed ok but have a an error
 643          * code (and hopefully sense data) attached.  This is roughly what
 644          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 645          * command we see here has no sas_task and is thus unknown to the HA.
 646          */
 647         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 648                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 649
 650 out:
 651         scsi_eh_flush_done_q(&ha->eh_done_q);
 652         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 653         return;
 654 }
 655
 656 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 657 {
 658         struct sas_task *task = TO_SAS_TASK(cmd);
 659         unsigned long flags;
 660
 661         if (!task) {
 662                 cmd->timeout_per_command /= 2;
 663                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 664                             cmd, task, (cmd->timeout_per_command ?
 665                             "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
 666                 if (!cmd->timeout_per_command)
 667                         return EH_NOT_HANDLED;
 668                 return EH_RESET_TIMER;
 669         }
 670
 671         spin_lock_irqsave(&task->task_state_lock, flags);
 672         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 673         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 674                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 675                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 676                             cmd, task);
 677                 return EH_HANDLED;
 678         }
 679         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 680                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 681                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 682                             "EH_RESET_TIMER\n",
 683                             cmd, task);
 684                 return EH_RESET_TIMER;
 685         }
 686         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 687         spin_unlock_irqrestore(&task->task_state_lock, flags);
 688
 689         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 690                     cmd, task);
 691
 692         return EH_NOT_HANDLED;
 693 }
 694
 695 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 696 {
 697         struct domain_device *dev = sdev_to_domain_dev(sdev);
 698
 699         if (dev_is_sata(dev))
 700                 return ata_scsi_ioctl(sdev, cmd, arg);
 701
 702         return -EINVAL;
 703 }
 704
 705 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 706 {
 707         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 708         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 709         struct domain_device *found_dev = NULL;
 710         int i;
 711         unsigned long flags;
 712
 713         spin_lock_irqsave(&ha->phy_port_lock, flags);
 714         for (i = 0; i < ha->num_phys; i++) {
 715                 struct asd_sas_port *port = ha->sas_port[i];
 716                 struct domain_device *dev;
 717
 718                 spin_lock(&port->dev_list_lock);
 719                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 720                         if (rphy == dev->rphy) {
 721                                 found_dev = dev;
 722                                 spin_unlock(&port->dev_list_lock);
 723                                 goto found;
 724                         }
 725                 }
 726                 spin_unlock(&port->dev_list_lock);
 727         }
 728  found:
 729         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 730
 731         return found_dev;
 732 }
 733
 734 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 735 {
 736         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 737
 738         return sas_find_dev_by_rphy(rphy);
 739 }
 740
 741 int sas_target_alloc(struct scsi_target *starget)
 742 {
 743         struct domain_device *found_dev = sas_find_target(starget);
 744         int res;
 745
 746         if (!found_dev)
 747                 return -ENODEV;
 748
 749         if (dev_is_sata(found_dev)) {
 750                 res = sas_ata_init_host_and_port(found_dev, starget);
 751                 if (res)
 752                         return res;
 753         }
 754
 755         starget->hostdata = found_dev;
 756         return 0;
 757 }
 758
 759 #define SAS_DEF_QD 32
 760 #define SAS_MAX_QD 64
 761
 762 int sas_slave_configure(struct scsi_device *scsi_dev)
 763 {
 764         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 765         struct sas_ha_struct *sas_ha;
 766
 767         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 768
 769         if (dev_is_sata(dev)) {
 770                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 771                 return 0;
 772         }
 773
 774         sas_ha = dev->port->ha;
 775
 776         sas_read_port_mode_page(scsi_dev);
 777
 778         if (scsi_dev->tagged_supported) {
 779                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 780                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 781         } else {
 782                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 783                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 784                             scsi_dev->lun);
 785                 scsi_dev->tagged_supported = 0;
 786                 scsi_set_tag_type(scsi_dev, 0);
 787                 scsi_deactivate_tcq(scsi_dev, 1);
 788         }
 789
 790         scsi_dev->allow_restart = 1;
 791
 792         return 0;
 793 }
 794
 795 void sas_slave_destroy(struct scsi_device *scsi_dev)
 796 {
 797         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 798
 799         if (dev_is_sata(dev))
 800                 ata_port_disable(dev->sata_dev.ap);
 801 }
 802
 803 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
 804 {
 805         int res = min(new_depth, SAS_MAX_QD);
 806
 807         if (scsi_dev->tagged_supported)
 808                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 809                                         res);
 810         else {
 811                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 812                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 813                            SAS_ADDR(dev->sas_addr),
 814                            scsi_dev->lun);
 815                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 816                 res = 1;
 817         }
 818
 819         return res;
 820 }
 821
 822 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 823 {
 824         if (!scsi_dev->tagged_supported)
 825                 return 0;
 826
 827         scsi_deactivate_tcq(scsi_dev, 1);
 828
 829         scsi_set_tag_type(scsi_dev, qt);
 830         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 831
 832         return qt;
 833 }
 834
 835 int sas_bios_param(struct scsi_device *scsi_dev,
 836                           struct block_device *bdev,
 837                           sector_t capacity, int *hsc)
 838 {
 839         hsc[0] = 255;
 840         hsc[1] = 63;
 841         sector_div(capacity, 255*63);
 842         hsc[2] = capacity;
 843
 844         return 0;
 845 }
 846
 847 /* ---------- Task Collector Thread implementation ---------- */
 848
 849 static void sas_queue(struct sas_ha_struct *sas_ha)
 850 {
 851         struct scsi_core *core = &sas_ha->core;
 852         unsigned long flags;
 853         LIST_HEAD(q);
 854         int can_queue;
 855         int res;
 856         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 857
 858         spin_lock_irqsave(&core->task_queue_lock, flags);
 859         while (!kthread_should_stop() &&
 860                !list_empty(&core->task_queue)) {
 861
 862                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 863                 if (can_queue >= 0) {
 864                         can_queue = core->task_queue_size;
 865                         list_splice_init(&core->task_queue, &q);
 866                 } else {
 867                         struct list_head *a, *n;
 868
 869                         can_queue = sas_ha->lldd_queue_size;
 870                         list_for_each_safe(a, n, &core->task_queue) {
 871                                 list_move_tail(a, &q);
 872                                 if (--can_queue == 0)
 873                                         break;
 874                         }
 875                         can_queue = sas_ha->lldd_queue_size;
 876                 }
 877                 core->task_queue_size -= can_queue;
 878                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 879                 {
 880                         struct sas_task *task = list_entry(q.next,
 881                                                            struct sas_task,
 882                                                            list);
 883                         list_del_init(&q);
 884                         res = i->dft->lldd_execute_task(task, can_queue,
 885                                                         GFP_KERNEL);
 886                         if (unlikely(res))
 887                                 __list_add(&q, task->list.prev, &task->list);
 888                 }
 889                 spin_lock_irqsave(&core->task_queue_lock, flags);
 890                 if (res) {
 891                         list_splice_init(&q, &core->task_queue); /*at head*/
 892                         core->task_queue_size += can_queue;
 893                 }
 894         }
 895         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 896 }
 897
 898 /**
 899  * sas_queue_thread -- The Task Collector thread
 900  * @_sas_ha: pointer to struct sas_ha
 901  */
 902 static int sas_queue_thread(void *_sas_ha)
 903 {
 904         struct sas_ha_struct *sas_ha = _sas_ha;
 905
 906         while (1) {
 907                 set_current_state(TASK_INTERRUPTIBLE);
 908                 schedule();
 909                 sas_queue(sas_ha);
 910                 if (kthread_should_stop())
 911                         break;
 912         }
 913
 914         return 0;
 915 }
 916
 917 int sas_init_queue(struct sas_ha_struct *sas_ha)
 918 {
 919         struct scsi_core *core = &sas_ha->core;
 920
 921         spin_lock_init(&core->task_queue_lock);
 922         core->task_queue_size = 0;
 923         INIT_LIST_HEAD(&core->task_queue);
 924
 925         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 926                                          "sas_queue_%d", core->shost->host_no);
 927         if (IS_ERR(core->queue_thread))
 928                 return PTR_ERR(core->queue_thread);
 929         return 0;
 930 }
 931
 932 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 933 {
 934         unsigned long flags;
 935         struct scsi_core *core = &sas_ha->core;
 936         struct sas_task *task, *n;
 937
 938         kthread_stop(core->queue_thread);
 939
 940         if (!list_empty(&core->task_queue))
 941                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 942                             SAS_ADDR(sas_ha->sas_addr));
 943
 944         spin_lock_irqsave(&core->task_queue_lock, flags);
 945         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 946                 struct scsi_cmnd *cmd = task->uldd_task;
 947
 948                 list_del_init(&task->list);
 949
 950                 ASSIGN_SAS_TASK(cmd, NULL);
 951                 sas_free_task(task);
 952                 cmd->result = DID_ABORT << 16;
 953                 cmd->scsi_done(cmd);
 954         }
 955         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 956 }
 957
 958 /*
 959  * Call the LLDD task abort routine directly.  This function is intended for
 960  * use by upper layers that need to tell the LLDD to abort a task.
 961  */
 962 int __sas_task_abort(struct sas_task *task)
 963 {
 964         struct sas_internal *si =
 965                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 966         unsigned long flags;
 967         int res;
 968
 969         spin_lock_irqsave(&task->task_state_lock, flags);
 970         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 971             task->task_state_flags & SAS_TASK_STATE_DONE) {
 972                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 973                 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
 974                             task);
 975                 return 0;
 976         }
 977         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 978         spin_unlock_irqrestore(&task->task_state_lock, flags);
 979
 980         if (!si->dft->lldd_abort_task)
 981                 return -ENODEV;
 982
 983         res = si->dft->lldd_abort_task(task);
 984
 985         spin_lock_irqsave(&task->task_state_lock, flags);
 986         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
 987             (res == TMF_RESP_FUNC_COMPLETE))
 988         {
 989                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 990                 task->task_done(task);
 991                 return 0;
 992         }
 993
 994         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 995                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 996         spin_unlock_irqrestore(&task->task_state_lock, flags);
 997
 998         return -EAGAIN;
 999 }
1000
1001 /*
1002  * Tell an upper layer that it needs to initiate an abort for a given task.
1003  * This should only ever be called by an LLDD.
1004  */
1005 void sas_task_abort(struct sas_task *task)
1006 {
1007         struct scsi_cmnd *sc = task->uldd_task;
1008
1009         /* Escape for libsas internal commands */
1010         if (!sc) {
1011                 if (!del_timer(&task->timer))
1012                         return;
1013                 task->timer.function(task->timer.data);
1014                 return;
1015         }
1016
1017         scsi_req_abort_cmd(sc);
1018         scsi_schedule_eh(sc->device->host);
1019 }
1020
1021 int sas_slave_alloc(struct scsi_device *scsi_dev)
1022 {
1023         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1024
1025         if (dev_is_sata(dev))
1026                 return ata_sas_port_init(dev->sata_dev.ap);
1027
1028         return 0;
1029 }
1030
1031 void sas_target_destroy(struct scsi_target *starget)
1032 {
1033         struct domain_device *found_dev = sas_find_target(starget);
1034
1035         if (!found_dev)
1036                 return;
1037
1038         if (dev_is_sata(found_dev))
1039                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1040
1041         return;
1042 }
1043
1044 EXPORT_SYMBOL_GPL(sas_queuecommand);
1045 EXPORT_SYMBOL_GPL(sas_target_alloc);
1046 EXPORT_SYMBOL_GPL(sas_slave_configure);
1047 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1048 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1049 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1050 EXPORT_SYMBOL_GPL(sas_bios_param);
1051 EXPORT_SYMBOL_GPL(__sas_task_abort);
1052 EXPORT_SYMBOL_GPL(sas_task_abort);
1053 EXPORT_SYMBOL_GPL(sas_phy_reset);
1054 EXPORT_SYMBOL_GPL(sas_phy_enable);
1055 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1056 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1057 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1058 EXPORT_SYMBOL_GPL(sas_target_destroy);
1059 EXPORT_SYMBOL_GPL(sas_ioctl);