SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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_internal.h"
  38 #include "../scsi_transport_api.h"
  39 #include "../scsi_priv.h"
  40
  41 #include <linux/err.h>
  42 #include <linux/blkdev.h>
  43 #include <linux/freezer.h>
  44 #include <linux/scatterlist.h>
  45
  46 /* ---------- SCSI Host glue ---------- */
  47
  48 #define TO_SAS_TASK(_scsi_cmd)  ((void *)(_scsi_cmd)->host_scribble)
  49 #define ASSIGN_SAS_TASK(_sc, _t) do { (_sc)->host_scribble = (void *) _t; } while (0)
  50
  51 static void sas_scsi_task_done(struct sas_task *task)
  52 {
  53         struct task_status_struct *ts = &task->task_status;
  54         struct scsi_cmnd *sc = task->uldd_task;
  55         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(sc->device->host);
  56         unsigned ts_flags = task->task_state_flags;
  57         int hs = 0, stat = 0;
  58
  59         if (unlikely(!sc)) {
  60                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  61                 list_del_init(&task->list);
  62                 sas_free_task(task);
  63                 return;
  64         }
  65
  66         if (ts->resp == SAS_TASK_UNDELIVERED) {
  67                 /* transport error */
  68                 hs = DID_NO_CONNECT;
  69         } else { /* ts->resp == SAS_TASK_COMPLETE */
  70                 /* task delivered, what happened afterwards? */
  71                 switch (ts->stat) {
  72                 case SAS_DEV_NO_RESPONSE:
  73                 case SAS_INTERRUPTED:
  74                 case SAS_PHY_DOWN:
  75                 case SAS_NAK_R_ERR:
  76                 case SAS_OPEN_TO:
  77                         hs = DID_NO_CONNECT;
  78                         break;
  79                 case SAS_DATA_UNDERRUN:
  80                         scsi_set_resid(sc, ts->residual);
  81                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  82                                 hs = DID_ERROR;
  83                         break;
  84                 case SAS_DATA_OVERRUN:
  85                         hs = DID_ERROR;
  86                         break;
  87                 case SAS_QUEUE_FULL:
  88                         hs = DID_SOFT_ERROR; /* retry */
  89                         break;
  90                 case SAS_DEVICE_UNKNOWN:
  91                         hs = DID_BAD_TARGET;
  92                         break;
  93                 case SAS_SG_ERR:
  94                         hs = DID_PARITY;
  95                         break;
  96                 case SAS_OPEN_REJECT:
  97                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
  98                                 hs = DID_SOFT_ERROR; /* retry */
  99                         else
 100                                 hs = DID_ERROR;
 101                         break;
 102                 case SAS_PROTO_RESPONSE:
 103                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
 104                                     "task; please report this\n",
 105                                     task->dev->port->ha->sas_ha_name);
 106                         break;
 107                 case SAS_ABORTED_TASK:
 108                         hs = DID_ABORT;
 109                         break;
 110                 case SAM_CHECK_COND:
 111                         memcpy(sc->sense_buffer, ts->buf,
 112                                max(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 113                         stat = SAM_CHECK_COND;
 114                         break;
 115                 default:
 116                         stat = ts->stat;
 117                         break;
 118                 }
 119         }
 120         ASSIGN_SAS_TASK(sc, NULL);
 121         sc->result = (hs << 16) | stat;
 122         list_del_init(&task->list);
 123         sas_free_task(task);
 124         /* This is very ugly but this is how SCSI Core works. */
 125         if (ts_flags & SAS_TASK_STATE_ABORTED)
 126                 scsi_eh_finish_cmd(sc, &sas_ha->eh_done_q);
 127         else
 128                 sc->scsi_done(sc);
 129 }
 130
 131 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
 132 {
 133         enum task_attribute ta = TASK_ATTR_SIMPLE;
 134         if (cmd->request && blk_rq_tagged(cmd->request)) {
 135                 if (cmd->device->ordered_tags &&
 136                     (cmd->request->cmd_flags & REQ_HARDBARRIER))
 137                         ta = TASK_ATTR_ORDERED;
 138         }
 139         return ta;
 140 }
 141
 142 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 143                                                struct domain_device *dev,
 144                                                gfp_t gfp_flags)
 145 {
 146         struct sas_task *task = sas_alloc_task(gfp_flags);
 147         struct scsi_lun lun;
 148
 149         if (!task)
 150                 return NULL;
 151
 152         *(u32 *)cmd->sense_buffer = 0;
 153         task->uldd_task = cmd;
 154         ASSIGN_SAS_TASK(cmd, task);
 155
 156         task->dev = dev;
 157         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 158
 159         task->ssp_task.retry_count = 1;
 160         int_to_scsilun(cmd->device->lun, &lun);
 161         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 162         task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
 163         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 164
 165         task->scatter = scsi_sglist(cmd);
 166         task->num_scatter = scsi_sg_count(cmd);
 167         task->total_xfer_len = scsi_bufflen(cmd);
 168         task->data_dir = cmd->sc_data_direction;
 169
 170         task->task_done = sas_scsi_task_done;
 171
 172         return task;
 173 }
 174
 175 static int sas_queue_up(struct sas_task *task)
 176 {
 177         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 178         struct scsi_core *core = &sas_ha->core;
 179         unsigned long flags;
 180         LIST_HEAD(list);
 181
 182         spin_lock_irqsave(&core->task_queue_lock, flags);
 183         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 184                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 185                 return -SAS_QUEUE_FULL;
 186         }
 187         list_add_tail(&task->list, &core->task_queue);
 188         core->task_queue_size += 1;
 189         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 190         wake_up_process(core->queue_thread);
 191
 192         return 0;
 193 }
 194
 195 /**
 196  * sas_queuecommand -- Enqueue a command for processing
 197  * @parameters: See SCSI Core documentation
 198  *
 199  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
 200  * call us without holding an IRQ spinlock...
 201  */
 202 int sas_queuecommand(struct scsi_cmnd *cmd,
 203                      void (*scsi_done)(struct scsi_cmnd *))
 204 {
 205         int res = 0;
 206         struct domain_device *dev = cmd_to_domain_dev(cmd);
 207         struct Scsi_Host *host = cmd->device->host;
 208         struct sas_internal *i = to_sas_internal(host->transportt);
 209
 210         spin_unlock_irq(host->host_lock);
 211
 212         {
 213                 struct sas_ha_struct *sas_ha = dev->port->ha;
 214                 struct sas_task *task;
 215
 216                 res = -ENOMEM;
 217                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
 218                 if (!task)
 219                         goto out;
 220
 221                 cmd->scsi_done = scsi_done;
 222                 /* Queue up, Direct Mode or Task Collector Mode. */
 223                 if (sas_ha->lldd_max_execute_num < 2)
 224                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 225                 else
 226                         res = sas_queue_up(task);
 227
 228                 /* Examine */
 229                 if (res) {
 230                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 231                         ASSIGN_SAS_TASK(cmd, NULL);
 232                         sas_free_task(task);
 233                         if (res == -SAS_QUEUE_FULL) {
 234                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 235                                 res = 0;
 236                                 scsi_done(cmd);
 237                         }
 238                         goto out;
 239                 }
 240         }
 241 out:
 242         spin_lock_irq(host->host_lock);
 243         return res;
 244 }
 245
 246 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 247 {
 248         struct scsi_cmnd *cmd, *n;
 249
 250         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 251                 if (cmd == my_cmd)
 252                         list_del_init(&cmd->eh_entry);
 253         }
 254 }
 255
 256 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 257                                      struct domain_device *dev)
 258 {
 259         struct scsi_cmnd *cmd, *n;
 260
 261         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 262                 struct domain_device *x = cmd_to_domain_dev(cmd);
 263
 264                 if (x == dev)
 265                         list_del_init(&cmd->eh_entry);
 266         }
 267 }
 268
 269 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 270                                       struct asd_sas_port *port)
 271 {
 272         struct scsi_cmnd *cmd, *n;
 273
 274         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 275                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 276                 struct asd_sas_port *x = dev->port;
 277
 278                 if (x == port)
 279                         list_del_init(&cmd->eh_entry);
 280         }
 281 }
 282
 283 enum task_disposition {
 284         TASK_IS_DONE,
 285         TASK_IS_ABORTED,
 286         TASK_IS_AT_LU,
 287         TASK_IS_NOT_AT_LU,
 288         TASK_ABORT_FAILED,
 289 };
 290
 291 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 292 {
 293         struct sas_ha_struct *ha = task->dev->port->ha;
 294         unsigned long flags;
 295         int i, res;
 296         struct sas_internal *si =
 297                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 298
 299         if (ha->lldd_max_execute_num > 1) {
 300                 struct scsi_core *core = &ha->core;
 301                 struct sas_task *t, *n;
 302
 303                 spin_lock_irqsave(&core->task_queue_lock, flags);
 304                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 305                         if (task == t) {
 306                                 list_del_init(&t->list);
 307                                 spin_unlock_irqrestore(&core->task_queue_lock,
 308                                                        flags);
 309                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 310                                             "task_queue\n",
 311                                             __FUNCTION__, task);
 312                                 return TASK_IS_ABORTED;
 313                         }
 314                 }
 315                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 316         }
 317
 318         for (i = 0; i < 5; i++) {
 319                 SAS_DPRINTK("%s: aborting task 0x%p\n", __FUNCTION__, task);
 320                 res = si->dft->lldd_abort_task(task);
 321
 322                 spin_lock_irqsave(&task->task_state_lock, flags);
 323                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 324                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 325                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 326                                     task);
 327                         return TASK_IS_DONE;
 328                 }
 329                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 330
 331                 if (res == TMF_RESP_FUNC_COMPLETE) {
 332                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 333                                     __FUNCTION__, task);
 334                         return TASK_IS_ABORTED;
 335                 } else if (si->dft->lldd_query_task) {
 336                         SAS_DPRINTK("%s: querying task 0x%p\n",
 337                                     __FUNCTION__, task);
 338                         res = si->dft->lldd_query_task(task);
 339                         switch (res) {
 340                         case TMF_RESP_FUNC_SUCC:
 341                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 342                                             __FUNCTION__, task);
 343                                 return TASK_IS_AT_LU;
 344                         case TMF_RESP_FUNC_COMPLETE:
 345                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 346                                             __FUNCTION__, task);
 347                                 return TASK_IS_NOT_AT_LU;
 348                         case TMF_RESP_FUNC_FAILED:
 349                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 350                                                 __FUNCTION__, task);
 351                                 return TASK_ABORT_FAILED;
 352                         }
 353
 354                 }
 355         }
 356         return res;
 357 }
 358
 359 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 360 {
 361         int res = TMF_RESP_FUNC_FAILED;
 362         struct scsi_lun lun;
 363         struct sas_internal *i =
 364                 to_sas_internal(dev->port->ha->core.shost->transportt);
 365
 366         int_to_scsilun(cmd->device->lun, &lun);
 367
 368         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 369                     SAS_ADDR(dev->sas_addr),
 370                     cmd->device->lun);
 371
 372         if (i->dft->lldd_abort_task_set)
 373                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 374
 375         if (res == TMF_RESP_FUNC_FAILED) {
 376                 if (i->dft->lldd_clear_task_set)
 377                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 378         }
 379
 380         if (res == TMF_RESP_FUNC_FAILED) {
 381                 if (i->dft->lldd_lu_reset)
 382                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 383         }
 384
 385         return res;
 386 }
 387
 388 static int sas_recover_I_T(struct domain_device *dev)
 389 {
 390         int res = TMF_RESP_FUNC_FAILED;
 391         struct sas_internal *i =
 392                 to_sas_internal(dev->port->ha->core.shost->transportt);
 393
 394         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 395                     SAS_ADDR(dev->sas_addr));
 396
 397         if (i->dft->lldd_I_T_nexus_reset)
 398                 res = i->dft->lldd_I_T_nexus_reset(dev);
 399
 400         return res;
 401 }
 402
 403 /* Find the sas_phy that's attached to this device */
 404 struct sas_phy *find_local_sas_phy(struct domain_device *dev)
 405 {
 406         struct domain_device *pdev = dev->parent;
 407         struct ex_phy *exphy = NULL;
 408         int i;
 409
 410         /* Directly attached device */
 411         if (!pdev)
 412                 return dev->port->phy;
 413
 414         /* Otherwise look in the expander */
 415         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 416                 if (!memcmp(dev->sas_addr,
 417                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 418                             SAS_ADDR_SIZE)) {
 419                         exphy = &pdev->ex_dev.ex_phy[i];
 420                         break;
 421                 }
 422
 423         BUG_ON(!exphy);
 424         return exphy->phy;
 425 }
 426
 427 /* Attempt to send a LUN reset message to a device */
 428 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 429 {
 430         struct domain_device *dev = cmd_to_domain_dev(cmd);
 431         struct sas_internal *i =
 432                 to_sas_internal(dev->port->ha->core.shost->transportt);
 433         struct scsi_lun lun;
 434         int res;
 435
 436         int_to_scsilun(cmd->device->lun, &lun);
 437
 438         if (!i->dft->lldd_lu_reset)
 439                 return FAILED;
 440
 441         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 442         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 443                 return SUCCESS;
 444
 445         return FAILED;
 446 }
 447
 448 /* Attempt to send a phy (bus) reset */
 449 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 450 {
 451         struct domain_device *dev = cmd_to_domain_dev(cmd);
 452         struct sas_phy *phy = find_local_sas_phy(dev);
 453         int res;
 454
 455         res = sas_phy_reset(phy, 1);
 456         if (res)
 457                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 458                             phy->dev.kobj.k_name,
 459                             res);
 460         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 461                 return SUCCESS;
 462
 463         return FAILED;
 464 }
 465
 466 /* Try to reset a device */
 467 static int try_to_reset_cmd_device(struct Scsi_Host *shost,
 468                                    struct scsi_cmnd *cmd)
 469 {
 470         int res;
 471
 472         if (!shost->hostt->eh_device_reset_handler)
 473                 goto try_bus_reset;
 474
 475         res = shost->hostt->eh_device_reset_handler(cmd);
 476         if (res == SUCCESS)
 477                 return res;
 478
 479 try_bus_reset:
 480         if (shost->hostt->eh_bus_reset_handler)
 481                 return shost->hostt->eh_bus_reset_handler(cmd);
 482
 483         return FAILED;
 484 }
 485
 486 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 487                                     struct list_head *work_q,
 488                                     struct list_head *done_q)
 489 {
 490         struct scsi_cmnd *cmd, *n;
 491         enum task_disposition res = TASK_IS_DONE;
 492         int tmf_resp, need_reset;
 493         struct sas_internal *i = to_sas_internal(shost->transportt);
 494         unsigned long flags;
 495         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 496
 497 Again:
 498         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 499                 struct sas_task *task = TO_SAS_TASK(cmd);
 500
 501                 if (!task)
 502                         continue;
 503
 504                 list_del_init(&cmd->eh_entry);
 505
 506                 spin_lock_irqsave(&task->task_state_lock, flags);
 507                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 508                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 509
 510                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 511                 res = sas_scsi_find_task(task);
 512
 513                 cmd->eh_eflags = 0;
 514
 515                 switch (res) {
 516                 case TASK_IS_DONE:
 517                         SAS_DPRINTK("%s: task 0x%p is done\n", __FUNCTION__,
 518                                     task);
 519                         task->task_done(task);
 520                         if (need_reset)
 521                                 try_to_reset_cmd_device(shost, cmd);
 522                         continue;
 523                 case TASK_IS_ABORTED:
 524                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 525                                     __FUNCTION__, task);
 526                         task->task_done(task);
 527                         if (need_reset)
 528                                 try_to_reset_cmd_device(shost, cmd);
 529                         continue;
 530                 case TASK_IS_AT_LU:
 531                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 532                         tmf_resp = sas_recover_lu(task->dev, cmd);
 533                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 534                                 SAS_DPRINTK("dev %016llx LU %x is "
 535                                             "recovered\n",
 536                                             SAS_ADDR(task->dev),
 537                                             cmd->device->lun);
 538                                 task->task_done(task);
 539                                 if (need_reset)
 540                                         try_to_reset_cmd_device(shost, cmd);
 541                                 sas_scsi_clear_queue_lu(work_q, cmd);
 542                                 goto Again;
 543                         }
 544                         /* fallthrough */
 545                 case TASK_IS_NOT_AT_LU:
 546                 case TASK_ABORT_FAILED:
 547                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 548                                     task);
 549                         tmf_resp = sas_recover_I_T(task->dev);
 550                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 551                                 SAS_DPRINTK("I_T %016llx recovered\n",
 552                                             SAS_ADDR(task->dev->sas_addr));
 553                                 task->task_done(task);
 554                                 if (need_reset)
 555                                         try_to_reset_cmd_device(shost, cmd);
 556                                 sas_scsi_clear_queue_I_T(work_q, task->dev);
 557                                 goto Again;
 558                         }
 559                         /* Hammer time :-) */
 560                         if (i->dft->lldd_clear_nexus_port) {
 561                                 struct asd_sas_port *port = task->dev->port;
 562                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 563                                             port->id);
 564                                 res = i->dft->lldd_clear_nexus_port(port);
 565                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 566                                         SAS_DPRINTK("clear nexus port:%d "
 567                                                     "succeeded\n", port->id);
 568                                         task->task_done(task);
 569                                         if (need_reset)
 570                                                 try_to_reset_cmd_device(shost, cmd);
 571                                         sas_scsi_clear_queue_port(work_q,
 572                                                                   port);
 573                                         goto Again;
 574                                 }
 575                         }
 576                         if (i->dft->lldd_clear_nexus_ha) {
 577                                 SAS_DPRINTK("clear nexus ha\n");
 578                                 res = i->dft->lldd_clear_nexus_ha(ha);
 579                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 580                                         SAS_DPRINTK("clear nexus ha "
 581                                                     "succeeded\n");
 582                                         task->task_done(task);
 583                                         if (need_reset)
 584                                                 try_to_reset_cmd_device(shost, cmd);
 585                                         goto out;
 586                                 }
 587                         }
 588                         /* If we are here -- this means that no amount
 589                          * of effort could recover from errors.  Quite
 590                          * possibly the HA just disappeared.
 591                          */
 592                         SAS_DPRINTK("error from  device %llx, LUN %x "
 593                                     "couldn't be recovered in any way\n",
 594                                     SAS_ADDR(task->dev->sas_addr),
 595                                     cmd->device->lun);
 596
 597                         task->task_done(task);
 598                         if (need_reset)
 599                                 try_to_reset_cmd_device(shost, cmd);
 600                         goto clear_q;
 601                 }
 602         }
 603 out:
 604         return list_empty(work_q);
 605 clear_q:
 606         SAS_DPRINTK("--- Exit %s -- clear_q\n", __FUNCTION__);
 607         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 608                 struct sas_task *task = TO_SAS_TASK(cmd);
 609                 list_del_init(&cmd->eh_entry);
 610                 task->task_done(task);
 611         }
 612         return list_empty(work_q);
 613 }
 614
 615 void sas_scsi_recover_host(struct Scsi_Host *shost)
 616 {
 617         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 618         unsigned long flags;
 619         LIST_HEAD(eh_work_q);
 620
 621         spin_lock_irqsave(shost->host_lock, flags);
 622         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 623         spin_unlock_irqrestore(shost->host_lock, flags);
 624
 625         SAS_DPRINTK("Enter %s\n", __FUNCTION__);
 626         /*
 627          * Deal with commands that still have SAS tasks (i.e. they didn't
 628          * complete via the normal sas_task completion mechanism)
 629          */
 630         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 631                 goto out;
 632
 633         /*
 634          * Now deal with SCSI commands that completed ok but have a an error
 635          * code (and hopefully sense data) attached.  This is roughly what
 636          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 637          * command we see here has no sas_task and is thus unknown to the HA.
 638          */
 639         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 640                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 641
 642 out:
 643         scsi_eh_flush_done_q(&ha->eh_done_q);
 644         SAS_DPRINTK("--- Exit %s\n", __FUNCTION__);
 645         return;
 646 }
 647
 648 enum scsi_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 649 {
 650         struct sas_task *task = TO_SAS_TASK(cmd);
 651         unsigned long flags;
 652
 653         if (!task) {
 654                 cmd->timeout_per_command /= 2;
 655                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 656                             cmd, task, (cmd->timeout_per_command ?
 657                             "EH_RESET_TIMER" : "EH_NOT_HANDLED"));
 658                 if (!cmd->timeout_per_command)
 659                         return EH_NOT_HANDLED;
 660                 return EH_RESET_TIMER;
 661         }
 662
 663         spin_lock_irqsave(&task->task_state_lock, flags);
 664         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 665         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 666                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 667                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_HANDLED\n",
 668                             cmd, task);
 669                 return EH_HANDLED;
 670         }
 671         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 672                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 673                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 674                             "EH_RESET_TIMER\n",
 675                             cmd, task);
 676                 return EH_RESET_TIMER;
 677         }
 678         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 679         spin_unlock_irqrestore(&task->task_state_lock, flags);
 680
 681         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: EH_NOT_HANDLED\n",
 682                     cmd, task);
 683
 684         return EH_NOT_HANDLED;
 685 }
 686
 687 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 688 {
 689         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 690         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 691         struct domain_device *found_dev = NULL;
 692         int i;
 693         unsigned long flags;
 694
 695         spin_lock_irqsave(&ha->phy_port_lock, flags);
 696         for (i = 0; i < ha->num_phys; i++) {
 697                 struct asd_sas_port *port = ha->sas_port[i];
 698                 struct domain_device *dev;
 699
 700                 spin_lock(&port->dev_list_lock);
 701                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 702                         if (rphy == dev->rphy) {
 703                                 found_dev = dev;
 704                                 spin_unlock(&port->dev_list_lock);
 705                                 goto found;
 706                         }
 707                 }
 708                 spin_unlock(&port->dev_list_lock);
 709         }
 710  found:
 711         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 712
 713         return found_dev;
 714 }
 715
 716 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 717 {
 718         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 719
 720         return sas_find_dev_by_rphy(rphy);
 721 }
 722
 723 int sas_target_alloc(struct scsi_target *starget)
 724 {
 725         struct domain_device *found_dev = sas_find_target(starget);
 726
 727         if (!found_dev)
 728                 return -ENODEV;
 729
 730         starget->hostdata = found_dev;
 731         return 0;
 732 }
 733
 734 #define SAS_DEF_QD 32
 735 #define SAS_MAX_QD 64
 736
 737 int sas_slave_configure(struct scsi_device *scsi_dev)
 738 {
 739         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 740         struct sas_ha_struct *sas_ha;
 741
 742         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 743
 744         sas_ha = dev->port->ha;
 745
 746         sas_read_port_mode_page(scsi_dev);
 747
 748         if (scsi_dev->tagged_supported) {
 749                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 750                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 751         } else {
 752                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 753                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 754                             scsi_dev->lun);
 755                 scsi_dev->tagged_supported = 0;
 756                 scsi_set_tag_type(scsi_dev, 0);
 757                 scsi_deactivate_tcq(scsi_dev, 1);
 758         }
 759
 760         scsi_dev->allow_restart = 1;
 761
 762         return 0;
 763 }
 764
 765 void sas_slave_destroy(struct scsi_device *scsi_dev)
 766 {
 767 }
 768
 769 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth)
 770 {
 771         int res = min(new_depth, SAS_MAX_QD);
 772
 773         if (scsi_dev->tagged_supported)
 774                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 775                                         res);
 776         else {
 777                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 778                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 779                            SAS_ADDR(dev->sas_addr),
 780                            scsi_dev->lun);
 781                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 782                 res = 1;
 783         }
 784
 785         return res;
 786 }
 787
 788 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 789 {
 790         if (!scsi_dev->tagged_supported)
 791                 return 0;
 792
 793         scsi_deactivate_tcq(scsi_dev, 1);
 794
 795         scsi_set_tag_type(scsi_dev, qt);
 796         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 797
 798         return qt;
 799 }
 800
 801 int sas_bios_param(struct scsi_device *scsi_dev,
 802                           struct block_device *bdev,
 803                           sector_t capacity, int *hsc)
 804 {
 805         hsc[0] = 255;
 806         hsc[1] = 63;
 807         sector_div(capacity, 255*63);
 808         hsc[2] = capacity;
 809
 810         return 0;
 811 }
 812
 813 /* ---------- Task Collector Thread implementation ---------- */
 814
 815 static void sas_queue(struct sas_ha_struct *sas_ha)
 816 {
 817         struct scsi_core *core = &sas_ha->core;
 818         unsigned long flags;
 819         LIST_HEAD(q);
 820         int can_queue;
 821         int res;
 822         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 823
 824         spin_lock_irqsave(&core->task_queue_lock, flags);
 825         while (!kthread_should_stop() &&
 826                !list_empty(&core->task_queue)) {
 827
 828                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 829                 if (can_queue >= 0) {
 830                         can_queue = core->task_queue_size;
 831                         list_splice_init(&core->task_queue, &q);
 832                 } else {
 833                         struct list_head *a, *n;
 834
 835                         can_queue = sas_ha->lldd_queue_size;
 836                         list_for_each_safe(a, n, &core->task_queue) {
 837                                 list_move_tail(a, &q);
 838                                 if (--can_queue == 0)
 839                                         break;
 840                         }
 841                         can_queue = sas_ha->lldd_queue_size;
 842                 }
 843                 core->task_queue_size -= can_queue;
 844                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 845                 {
 846                         struct sas_task *task = list_entry(q.next,
 847                                                            struct sas_task,
 848                                                            list);
 849                         list_del_init(&q);
 850                         res = i->dft->lldd_execute_task(task, can_queue,
 851                                                         GFP_KERNEL);
 852                         if (unlikely(res))
 853                                 __list_add(&q, task->list.prev, &task->list);
 854                 }
 855                 spin_lock_irqsave(&core->task_queue_lock, flags);
 856                 if (res) {
 857                         list_splice_init(&q, &core->task_queue); /*at head*/
 858                         core->task_queue_size += can_queue;
 859                 }
 860         }
 861         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 862 }
 863
 864 /**
 865  * sas_queue_thread -- The Task Collector thread
 866  * @_sas_ha: pointer to struct sas_ha
 867  */
 868 static int sas_queue_thread(void *_sas_ha)
 869 {
 870         struct sas_ha_struct *sas_ha = _sas_ha;
 871
 872         while (1) {
 873                 set_current_state(TASK_INTERRUPTIBLE);
 874                 schedule();
 875                 sas_queue(sas_ha);
 876                 if (kthread_should_stop())
 877                         break;
 878         }
 879
 880         return 0;
 881 }
 882
 883 int sas_init_queue(struct sas_ha_struct *sas_ha)
 884 {
 885         struct scsi_core *core = &sas_ha->core;
 886
 887         spin_lock_init(&core->task_queue_lock);
 888         core->task_queue_size = 0;
 889         INIT_LIST_HEAD(&core->task_queue);
 890
 891         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 892                                          "sas_queue_%d", core->shost->host_no);
 893         if (IS_ERR(core->queue_thread))
 894                 return PTR_ERR(core->queue_thread);
 895         return 0;
 896 }
 897
 898 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 899 {
 900         unsigned long flags;
 901         struct scsi_core *core = &sas_ha->core;
 902         struct sas_task *task, *n;
 903
 904         kthread_stop(core->queue_thread);
 905
 906         if (!list_empty(&core->task_queue))
 907                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 908                             SAS_ADDR(sas_ha->sas_addr));
 909
 910         spin_lock_irqsave(&core->task_queue_lock, flags);
 911         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 912                 struct scsi_cmnd *cmd = task->uldd_task;
 913
 914                 list_del_init(&task->list);
 915
 916                 ASSIGN_SAS_TASK(cmd, NULL);
 917                 sas_free_task(task);
 918                 cmd->result = DID_ABORT << 16;
 919                 cmd->scsi_done(cmd);
 920         }
 921         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 922 }
 923
 924 /*
 925  * Call the LLDD task abort routine directly.  This function is intended for
 926  * use by upper layers that need to tell the LLDD to abort a task.
 927  */
 928 int __sas_task_abort(struct sas_task *task)
 929 {
 930         struct sas_internal *si =
 931                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 932         unsigned long flags;
 933         int res;
 934
 935         spin_lock_irqsave(&task->task_state_lock, flags);
 936         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 937             task->task_state_flags & SAS_TASK_STATE_DONE) {
 938                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 939                 SAS_DPRINTK("%s: Task %p already finished.\n", __FUNCTION__,
 940                             task);
 941                 return 0;
 942         }
 943         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 944         spin_unlock_irqrestore(&task->task_state_lock, flags);
 945
 946         if (!si->dft->lldd_abort_task)
 947                 return -ENODEV;
 948
 949         res = si->dft->lldd_abort_task(task);
 950
 951         spin_lock_irqsave(&task->task_state_lock, flags);
 952         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
 953             (res == TMF_RESP_FUNC_COMPLETE))
 954         {
 955                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 956                 task->task_done(task);
 957                 return 0;
 958         }
 959
 960         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 961                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 962         spin_unlock_irqrestore(&task->task_state_lock, flags);
 963
 964         return -EAGAIN;
 965 }
 966
 967 /*
 968  * Tell an upper layer that it needs to initiate an abort for a given task.
 969  * This should only ever be called by an LLDD.
 970  */
 971 void sas_task_abort(struct sas_task *task)
 972 {
 973         struct scsi_cmnd *sc = task->uldd_task;
 974
 975         /* Escape for libsas internal commands */
 976         if (!sc) {
 977                 if (!del_timer(&task->timer))
 978                         return;
 979                 task->timer.function(task->timer.data);
 980                 return;
 981         }
 982
 983         scsi_req_abort_cmd(sc);
 984         scsi_schedule_eh(sc->device->host);
 985 }
 986
 987 EXPORT_SYMBOL_GPL(sas_queuecommand);
 988 EXPORT_SYMBOL_GPL(sas_target_alloc);
 989 EXPORT_SYMBOL_GPL(sas_slave_configure);
 990 EXPORT_SYMBOL_GPL(sas_slave_destroy);
 991 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
 992 EXPORT_SYMBOL_GPL(sas_change_queue_type);
 993 EXPORT_SYMBOL_GPL(sas_bios_param);
 994 EXPORT_SYMBOL_GPL(__sas_task_abort);
 995 EXPORT_SYMBOL_GPL(sas_task_abort);
 996 EXPORT_SYMBOL_GPL(sas_phy_reset);
 997 EXPORT_SYMBOL_GPL(sas_phy_enable);
 998 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
 999 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);