drivers/scsi/libsas/sas_scsi_host.c

   1 /*
   2  * Serial Attached SCSI (SAS) class SCSI Host glue.
   3  *
   4  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   5  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   6  *
   7  * This file is licensed under GPLv2.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22  * USA
  23  *
  24  */
  25
  26 #include <linux/kthread.h>
  27 #include <linux/firmware.h>
  28 #include <linux/export.h>
  29 #include <linux/ctype.h>
  30
  31 #include "sas_internal.h"
  32
  33 #include <scsi/scsi_host.h>
  34 #include <scsi/scsi_device.h>
  35 #include <scsi/scsi_tcq.h>
  36 #include <scsi/scsi.h>
  37 #include <scsi/scsi_eh.h>
  38 #include <scsi/scsi_transport.h>
  39 #include <scsi/scsi_transport_sas.h>
  40 #include <scsi/sas_ata.h>
  41 #include "../scsi_sas_internal.h"
  42 #include "../scsi_transport_api.h"
  43 #include "../scsi_priv.h"
  44
  45 #include <linux/err.h>
  46 #include <linux/blkdev.h>
  47 #include <linux/freezer.h>
  48 #include <linux/gfp.h>
  49 #include <linux/scatterlist.h>
  50 #include <linux/libata.h>
  51
  52 /* ---------- SCSI Host glue ---------- */
  53
  54 static void sas_scsi_task_done(struct sas_task *task)
  55 {
  56         struct task_status_struct *ts = &task->task_status;
  57         struct scsi_cmnd *sc = task->uldd_task;
  58         int hs = 0, stat = 0;
  59
  60         if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
  61                 /* Aborted tasks will be completed by the error handler */
  62                 SAS_DPRINTK("task done but aborted\n");
  63                 return;
  64         }
  65
  66         if (unlikely(!sc)) {
  67                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  68                 list_del_init(&task->list);
  69                 sas_free_task(task);
  70                 return;
  71         }
  72
  73         if (ts->resp == SAS_TASK_UNDELIVERED) {
  74                 /* transport error */
  75                 hs = DID_NO_CONNECT;
  76         } else { /* ts->resp == SAS_TASK_COMPLETE */
  77                 /* task delivered, what happened afterwards? */
  78                 switch (ts->stat) {
  79                 case SAS_DEV_NO_RESPONSE:
  80                 case SAS_INTERRUPTED:
  81                 case SAS_PHY_DOWN:
  82                 case SAS_NAK_R_ERR:
  83                 case SAS_OPEN_TO:
  84                         hs = DID_NO_CONNECT;
  85                         break;
  86                 case SAS_DATA_UNDERRUN:
  87                         scsi_set_resid(sc, ts->residual);
  88                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  89                                 hs = DID_ERROR;
  90                         break;
  91                 case SAS_DATA_OVERRUN:
  92                         hs = DID_ERROR;
  93                         break;
  94                 case SAS_QUEUE_FULL:
  95                         hs = DID_SOFT_ERROR; /* retry */
  96                         break;
  97                 case SAS_DEVICE_UNKNOWN:
  98                         hs = DID_BAD_TARGET;
  99                         break;
 100                 case SAS_SG_ERR:
 101                         hs = DID_PARITY;
 102                         break;
 103                 case SAS_OPEN_REJECT:
 104                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
 105                                 hs = DID_SOFT_ERROR; /* retry */
 106                         else
 107                                 hs = DID_ERROR;
 108                         break;
 109                 case SAS_PROTO_RESPONSE:
 110                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
 111                                     "task; please report this\n",
 112                                     task->dev->port->ha->sas_ha_name);
 113                         break;
 114                 case SAS_ABORTED_TASK:
 115                         hs = DID_ABORT;
 116                         break;
 117                 case SAM_STAT_CHECK_CONDITION:
 118                         memcpy(sc->sense_buffer, ts->buf,
 119                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 120                         stat = SAM_STAT_CHECK_CONDITION;
 121                         break;
 122                 default:
 123                         stat = ts->stat;
 124                         break;
 125                 }
 126         }
 127         ASSIGN_SAS_TASK(sc, NULL);
 128         sc->result = (hs << 16) | stat;
 129         list_del_init(&task->list);
 130         sas_free_task(task);
 131         sc->scsi_done(sc);
 132 }
 133
 134 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 135                                                struct domain_device *dev,
 136                                                gfp_t gfp_flags)
 137 {
 138         struct sas_task *task = sas_alloc_task(gfp_flags);
 139         struct scsi_lun lun;
 140
 141         if (!task)
 142                 return NULL;
 143
 144         task->uldd_task = cmd;
 145         ASSIGN_SAS_TASK(cmd, task);
 146
 147         task->dev = dev;
 148         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 149
 150         task->ssp_task.retry_count = 1;
 151         int_to_scsilun(cmd->device->lun, &lun);
 152         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 153         task->ssp_task.task_attr = TASK_ATTR_SIMPLE;
 154         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 155
 156         task->scatter = scsi_sglist(cmd);
 157         task->num_scatter = scsi_sg_count(cmd);
 158         task->total_xfer_len = scsi_bufflen(cmd);
 159         task->data_dir = cmd->sc_data_direction;
 160
 161         task->task_done = sas_scsi_task_done;
 162
 163         return task;
 164 }
 165
 166 int sas_queue_up(struct sas_task *task)
 167 {
 168         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 169         struct scsi_core *core = &sas_ha->core;
 170         unsigned long flags;
 171         LIST_HEAD(list);
 172
 173         spin_lock_irqsave(&core->task_queue_lock, flags);
 174         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 175                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 176                 return -SAS_QUEUE_FULL;
 177         }
 178         list_add_tail(&task->list, &core->task_queue);
 179         core->task_queue_size += 1;
 180         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 181         wake_up_process(core->queue_thread);
 182
 183         return 0;
 184 }
 185
 186 int sas_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *cmd)
 187 {
 188         struct sas_internal *i = to_sas_internal(host->transportt);
 189         struct domain_device *dev = cmd_to_domain_dev(cmd);
 190         struct sas_ha_struct *sas_ha = dev->port->ha;
 191         struct sas_task *task;
 192         int res = 0;
 193
 194         /* If the device fell off, no sense in issuing commands */
 195         if (dev->gone) {
 196                 cmd->result = DID_BAD_TARGET << 16;
 197                 goto out_done;
 198         }
 199
 200         if (dev_is_sata(dev)) {
 201                 spin_lock_irq(dev->sata_dev.ap->lock);
 202                 res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
 203                 spin_unlock_irq(dev->sata_dev.ap->lock);
 204                 return res;
 205         }
 206
 207         task = sas_create_task(cmd, dev, GFP_ATOMIC);
 208         if (!task)
 209                 return SCSI_MLQUEUE_HOST_BUSY;
 210
 211         /* Queue up, Direct Mode or Task Collector Mode. */
 212         if (sas_ha->lldd_max_execute_num < 2)
 213                 res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 214         else
 215                 res = sas_queue_up(task);
 216
 217         if (res)
 218                 goto out_free_task;
 219         return 0;
 220
 221 out_free_task:
 222         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 223         ASSIGN_SAS_TASK(cmd, NULL);
 224         sas_free_task(task);
 225         if (res == -SAS_QUEUE_FULL)
 226                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 227         else
 228                 cmd->result = DID_ERROR << 16;
 229 out_done:
 230         cmd->scsi_done(cmd);
 231         return 0;
 232 }
 233
 234 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
 235 {
 236         struct sas_task *task = TO_SAS_TASK(cmd);
 237         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
 238
 239         /* remove the aborted task flag to allow the task to be
 240          * completed now. At this point, we only get called following
 241          * an actual abort of the task, so we should be guaranteed not
 242          * to be racing with any completions from the LLD (hence we
 243          * don't need the task state lock to clear the flag) */
 244         task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 245         /* Now call task_done.  However, task will be free'd after
 246          * this */
 247         task->task_done(task);
 248         /* now finish the command and move it on to the error
 249          * handler done list, this also takes it off the
 250          * error handler pending list */
 251         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
 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->device->sdev_target == my_cmd->device->sdev_target &&
 260                     cmd->device->lun == my_cmd->device->lun)
 261                         sas_eh_finish_cmd(cmd);
 262         }
 263 }
 264
 265 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 266                                      struct domain_device *dev)
 267 {
 268         struct scsi_cmnd *cmd, *n;
 269
 270         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 271                 struct domain_device *x = cmd_to_domain_dev(cmd);
 272
 273                 if (x == dev)
 274                         sas_eh_finish_cmd(cmd);
 275         }
 276 }
 277
 278 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 279                                       struct asd_sas_port *port)
 280 {
 281         struct scsi_cmnd *cmd, *n;
 282
 283         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 284                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 285                 struct asd_sas_port *x = dev->port;
 286
 287                 if (x == port)
 288                         sas_eh_finish_cmd(cmd);
 289         }
 290 }
 291
 292 enum task_disposition {
 293         TASK_IS_DONE,
 294         TASK_IS_ABORTED,
 295         TASK_IS_AT_LU,
 296         TASK_IS_NOT_AT_LU,
 297         TASK_ABORT_FAILED,
 298 };
 299
 300 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 301 {
 302         struct sas_ha_struct *ha = task->dev->port->ha;
 303         unsigned long flags;
 304         int i, res;
 305         struct sas_internal *si =
 306                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 307
 308         if (ha->lldd_max_execute_num > 1) {
 309                 struct scsi_core *core = &ha->core;
 310                 struct sas_task *t, *n;
 311
 312                 spin_lock_irqsave(&core->task_queue_lock, flags);
 313                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 314                         if (task == t) {
 315                                 list_del_init(&t->list);
 316                                 spin_unlock_irqrestore(&core->task_queue_lock,
 317                                                        flags);
 318                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 319                                             "task_queue\n",
 320                                             __func__, task);
 321                                 return TASK_IS_ABORTED;
 322                         }
 323                 }
 324                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 325         }
 326
 327         for (i = 0; i < 5; i++) {
 328                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
 329                 res = si->dft->lldd_abort_task(task);
 330
 331                 spin_lock_irqsave(&task->task_state_lock, flags);
 332                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 333                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 334                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 335                                     task);
 336                         return TASK_IS_DONE;
 337                 }
 338                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 339
 340                 if (res == TMF_RESP_FUNC_COMPLETE) {
 341                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 342                                     __func__, task);
 343                         return TASK_IS_ABORTED;
 344                 } else if (si->dft->lldd_query_task) {
 345                         SAS_DPRINTK("%s: querying task 0x%p\n",
 346                                     __func__, task);
 347                         res = si->dft->lldd_query_task(task);
 348                         switch (res) {
 349                         case TMF_RESP_FUNC_SUCC:
 350                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 351                                             __func__, task);
 352                                 return TASK_IS_AT_LU;
 353                         case TMF_RESP_FUNC_COMPLETE:
 354                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 355                                             __func__, task);
 356                                 return TASK_IS_NOT_AT_LU;
 357                         case TMF_RESP_FUNC_FAILED:
 358                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 359                                                 __func__, task);
 360                                 return TASK_ABORT_FAILED;
 361                         }
 362
 363                 }
 364         }
 365         return res;
 366 }
 367
 368 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 369 {
 370         int res = TMF_RESP_FUNC_FAILED;
 371         struct scsi_lun lun;
 372         struct sas_internal *i =
 373                 to_sas_internal(dev->port->ha->core.shost->transportt);
 374
 375         int_to_scsilun(cmd->device->lun, &lun);
 376
 377         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 378                     SAS_ADDR(dev->sas_addr),
 379                     cmd->device->lun);
 380
 381         if (i->dft->lldd_abort_task_set)
 382                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 383
 384         if (res == TMF_RESP_FUNC_FAILED) {
 385                 if (i->dft->lldd_clear_task_set)
 386                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 387         }
 388
 389         if (res == TMF_RESP_FUNC_FAILED) {
 390                 if (i->dft->lldd_lu_reset)
 391                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 392         }
 393
 394         return res;
 395 }
 396
 397 static int sas_recover_I_T(struct domain_device *dev)
 398 {
 399         int res = TMF_RESP_FUNC_FAILED;
 400         struct sas_internal *i =
 401                 to_sas_internal(dev->port->ha->core.shost->transportt);
 402
 403         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 404                     SAS_ADDR(dev->sas_addr));
 405
 406         if (i->dft->lldd_I_T_nexus_reset)
 407                 res = i->dft->lldd_I_T_nexus_reset(dev);
 408
 409         return res;
 410 }
 411
 412 /* Find the sas_phy that's attached to this device */
 413 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
 414 {
 415         struct domain_device *pdev = dev->parent;
 416         struct ex_phy *exphy = NULL;
 417         int i;
 418
 419         /* Directly attached device */
 420         if (!pdev)
 421                 return dev->port->phy;
 422
 423         /* Otherwise look in the expander */
 424         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 425                 if (!memcmp(dev->sas_addr,
 426                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 427                             SAS_ADDR_SIZE)) {
 428                         exphy = &pdev->ex_dev.ex_phy[i];
 429                         break;
 430                 }
 431
 432         BUG_ON(!exphy);
 433         return exphy->phy;
 434 }
 435 EXPORT_SYMBOL_GPL(sas_find_local_phy);
 436
 437 /* Attempt to send a LUN reset message to a device */
 438 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 439 {
 440         struct domain_device *dev = cmd_to_domain_dev(cmd);
 441         struct sas_internal *i =
 442                 to_sas_internal(dev->port->ha->core.shost->transportt);
 443         struct scsi_lun lun;
 444         int res;
 445
 446         int_to_scsilun(cmd->device->lun, &lun);
 447
 448         if (!i->dft->lldd_lu_reset)
 449                 return FAILED;
 450
 451         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 452         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 453                 return SUCCESS;
 454
 455         return FAILED;
 456 }
 457
 458 /* Attempt to send a phy (bus) reset */
 459 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 460 {
 461         struct domain_device *dev = cmd_to_domain_dev(cmd);
 462         struct sas_phy *phy = sas_find_local_phy(dev);
 463         int res;
 464
 465         res = sas_phy_reset(phy, 1);
 466         if (res)
 467                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 468                             kobject_name(&phy->dev.kobj),
 469                             res);
 470         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 471                 return SUCCESS;
 472
 473         return FAILED;
 474 }
 475
 476 /* Try to reset a device */
 477 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
 478 {
 479         int res;
 480         struct Scsi_Host *shost = cmd->device->host;
 481
 482         if (!shost->hostt->eh_device_reset_handler)
 483                 goto try_bus_reset;
 484
 485         res = shost->hostt->eh_device_reset_handler(cmd);
 486         if (res == SUCCESS)
 487                 return res;
 488
 489 try_bus_reset:
 490         if (shost->hostt->eh_bus_reset_handler)
 491                 return shost->hostt->eh_bus_reset_handler(cmd);
 492
 493         return FAILED;
 494 }
 495
 496 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 497                                     struct list_head *work_q,
 498                                     struct list_head *done_q)
 499 {
 500         struct scsi_cmnd *cmd, *n;
 501         enum task_disposition res = TASK_IS_DONE;
 502         int tmf_resp, need_reset;
 503         struct sas_internal *i = to_sas_internal(shost->transportt);
 504         unsigned long flags;
 505         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 506
 507 Again:
 508         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 509                 struct sas_task *task = TO_SAS_TASK(cmd);
 510
 511                 if (!task)
 512                         continue;
 513
 514                 list_del_init(&cmd->eh_entry);
 515
 516                 spin_lock_irqsave(&task->task_state_lock, flags);
 517                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 518                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 519
 520                 if (need_reset) {
 521                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
 522                                     __func__, task);
 523                         goto reset;
 524                 }
 525
 526                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 527                 res = sas_scsi_find_task(task);
 528
 529                 cmd->eh_eflags = 0;
 530
 531                 switch (res) {
 532                 case TASK_IS_DONE:
 533                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 534                                     task);
 535                         sas_eh_finish_cmd(cmd);
 536                         continue;
 537                 case TASK_IS_ABORTED:
 538                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 539                                     __func__, task);
 540                         sas_eh_finish_cmd(cmd);
 541                         continue;
 542                 case TASK_IS_AT_LU:
 543                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 544  reset:
 545                         tmf_resp = sas_recover_lu(task->dev, cmd);
 546                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 547                                 SAS_DPRINTK("dev %016llx LU %x is "
 548                                             "recovered\n",
 549                                             SAS_ADDR(task->dev),
 550                                             cmd->device->lun);
 551                                 sas_eh_finish_cmd(cmd);
 552                                 sas_scsi_clear_queue_lu(work_q, cmd);
 553                                 goto Again;
 554                         }
 555                         /* fallthrough */
 556                 case TASK_IS_NOT_AT_LU:
 557                 case TASK_ABORT_FAILED:
 558                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 559                                     task);
 560                         tmf_resp = sas_recover_I_T(task->dev);
 561                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 562                                 struct domain_device *dev = task->dev;
 563                                 SAS_DPRINTK("I_T %016llx recovered\n",
 564                                             SAS_ADDR(task->dev->sas_addr));
 565                                 sas_eh_finish_cmd(cmd);
 566                                 sas_scsi_clear_queue_I_T(work_q, dev);
 567                                 goto Again;
 568                         }
 569                         /* Hammer time :-) */
 570                         try_to_reset_cmd_device(cmd);
 571                         if (i->dft->lldd_clear_nexus_port) {
 572                                 struct asd_sas_port *port = task->dev->port;
 573                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 574                                             port->id);
 575                                 res = i->dft->lldd_clear_nexus_port(port);
 576                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 577                                         SAS_DPRINTK("clear nexus port:%d "
 578                                                     "succeeded\n", port->id);
 579                                         sas_eh_finish_cmd(cmd);
 580                                         sas_scsi_clear_queue_port(work_q,
 581                                                                   port);
 582                                         goto Again;
 583                                 }
 584                         }
 585                         if (i->dft->lldd_clear_nexus_ha) {
 586                                 SAS_DPRINTK("clear nexus ha\n");
 587                                 res = i->dft->lldd_clear_nexus_ha(ha);
 588                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 589                                         SAS_DPRINTK("clear nexus ha "
 590                                                     "succeeded\n");
 591                                         sas_eh_finish_cmd(cmd);
 592                                         goto clear_q;
 593                                 }
 594                         }
 595                         /* If we are here -- this means that no amount
 596                          * of effort could recover from errors.  Quite
 597                          * possibly the HA just disappeared.
 598                          */
 599                         SAS_DPRINTK("error from  device %llx, LUN %x "
 600                                     "couldn't be recovered in any way\n",
 601                                     SAS_ADDR(task->dev->sas_addr),
 602                                     cmd->device->lun);
 603
 604                         sas_eh_finish_cmd(cmd);
 605                         goto clear_q;
 606                 }
 607         }
 608         return list_empty(work_q);
 609 clear_q:
 610         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
 611         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 612                 sas_eh_finish_cmd(cmd);
 613
 614         return list_empty(work_q);
 615 }
 616
 617 void sas_scsi_recover_host(struct Scsi_Host *shost)
 618 {
 619         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 620         unsigned long flags;
 621         LIST_HEAD(eh_work_q);
 622
 623         spin_lock_irqsave(shost->host_lock, flags);
 624         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 625         shost->host_eh_scheduled = 0;
 626         spin_unlock_irqrestore(shost->host_lock, flags);
 627
 628         SAS_DPRINTK("Enter %s\n", __func__);
 629         /*
 630          * Deal with commands that still have SAS tasks (i.e. they didn't
 631          * complete via the normal sas_task completion mechanism)
 632          */
 633         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 634                 goto out;
 635
 636         /*
 637          * Now deal with SCSI commands that completed ok but have a an error
 638          * code (and hopefully sense data) attached.  This is roughly what
 639          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 640          * command we see here has no sas_task and is thus unknown to the HA.
 641          */
 642         if (!sas_ata_eh(shost, &eh_work_q, &ha->eh_done_q))
 643                 if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 644                         scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 645
 646 out:
 647         /* now link into libata eh --- if we have any ata devices */
 648         sas_ata_strategy_handler(shost);
 649
 650         scsi_eh_flush_done_q(&ha->eh_done_q);
 651
 652         SAS_DPRINTK("--- Exit %s\n", __func__);
 653         return;
 654 }
 655
 656 enum blk_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         enum blk_eh_timer_return rtn;
 661
 662         if (sas_ata_timed_out(cmd, task, &rtn))
 663                 return rtn;
 664
 665         if (!task) {
 666                 cmd->request->timeout /= 2;
 667                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 668                             cmd, task, (cmd->request->timeout ?
 669                             "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
 670                 if (!cmd->request->timeout)
 671                         return BLK_EH_NOT_HANDLED;
 672                 return BLK_EH_RESET_TIMER;
 673         }
 674
 675         spin_lock_irqsave(&task->task_state_lock, flags);
 676         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 677         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 678                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 679                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
 680                             "BLK_EH_HANDLED\n", cmd, task);
 681                 return BLK_EH_HANDLED;
 682         }
 683         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 684                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 685                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 686                             "BLK_EH_RESET_TIMER\n",
 687                             cmd, task);
 688                 return BLK_EH_RESET_TIMER;
 689         }
 690         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 691         spin_unlock_irqrestore(&task->task_state_lock, flags);
 692
 693         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
 694                     cmd, task);
 695
 696         return BLK_EH_NOT_HANDLED;
 697 }
 698
 699 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 700 {
 701         struct domain_device *dev = sdev_to_domain_dev(sdev);
 702
 703         if (dev_is_sata(dev))
 704                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
 705
 706         return -EINVAL;
 707 }
 708
 709 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 710 {
 711         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 712         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 713         struct domain_device *found_dev = NULL;
 714         int i;
 715         unsigned long flags;
 716
 717         spin_lock_irqsave(&ha->phy_port_lock, flags);
 718         for (i = 0; i < ha->num_phys; i++) {
 719                 struct asd_sas_port *port = ha->sas_port[i];
 720                 struct domain_device *dev;
 721
 722                 spin_lock(&port->dev_list_lock);
 723                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 724                         if (rphy == dev->rphy) {
 725                                 found_dev = dev;
 726                                 spin_unlock(&port->dev_list_lock);
 727                                 goto found;
 728                         }
 729                 }
 730                 spin_unlock(&port->dev_list_lock);
 731         }
 732  found:
 733         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 734
 735         return found_dev;
 736 }
 737
 738 int sas_target_alloc(struct scsi_target *starget)
 739 {
 740         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 741         struct domain_device *found_dev = sas_find_dev_by_rphy(rphy);
 742         int res;
 743
 744         if (!found_dev)
 745                 return -ENODEV;
 746
 747         if (dev_is_sata(found_dev)) {
 748                 res = sas_ata_init_host_and_port(found_dev, starget);
 749                 if (res)
 750                         return res;
 751         }
 752
 753         kref_get(&found_dev->kref);
 754         starget->hostdata = found_dev;
 755         return 0;
 756 }
 757
 758 #define SAS_DEF_QD 256
 759
 760 int sas_slave_configure(struct scsi_device *scsi_dev)
 761 {
 762         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 763         struct sas_ha_struct *sas_ha;
 764
 765         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 766
 767         if (dev_is_sata(dev)) {
 768                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 769                 return 0;
 770         }
 771
 772         sas_ha = dev->port->ha;
 773
 774         sas_read_port_mode_page(scsi_dev);
 775
 776         if (scsi_dev->tagged_supported) {
 777                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 778                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 779         } else {
 780                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 781                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 782                             scsi_dev->lun);
 783                 scsi_dev->tagged_supported = 0;
 784                 scsi_set_tag_type(scsi_dev, 0);
 785                 scsi_deactivate_tcq(scsi_dev, 1);
 786         }
 787
 788         scsi_dev->allow_restart = 1;
 789
 790         return 0;
 791 }
 792
 793 int sas_change_queue_depth(struct scsi_device *sdev, int depth, int reason)
 794 {
 795         struct domain_device *dev = sdev_to_domain_dev(sdev);
 796
 797         if (dev_is_sata(dev))
 798                 return __ata_change_queue_depth(dev->sata_dev.ap, sdev, depth,
 799                                                 reason);
 800
 801         switch (reason) {
 802         case SCSI_QDEPTH_DEFAULT:
 803         case SCSI_QDEPTH_RAMP_UP:
 804                 if (!sdev->tagged_supported)
 805                         depth = 1;
 806                 scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth);
 807                 break;
 808         case SCSI_QDEPTH_QFULL:
 809                 scsi_track_queue_full(sdev, depth);
 810                 break;
 811         default:
 812                 return -EOPNOTSUPP;
 813         }
 814
 815         return depth;
 816 }
 817
 818 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 819 {
 820         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 821
 822         if (dev_is_sata(dev))
 823                 return -EINVAL;
 824
 825         if (!scsi_dev->tagged_supported)
 826                 return 0;
 827
 828         scsi_deactivate_tcq(scsi_dev, 1);
 829
 830         scsi_set_tag_type(scsi_dev, qt);
 831         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 832
 833         return qt;
 834 }
 835
 836 int sas_bios_param(struct scsi_device *scsi_dev,
 837                           struct block_device *bdev,
 838                           sector_t capacity, int *hsc)
 839 {
 840         hsc[0] = 255;
 841         hsc[1] = 63;
 842         sector_div(capacity, 255*63);
 843         hsc[2] = capacity;
 844
 845         return 0;
 846 }
 847
 848 /* ---------- Task Collector Thread implementation ---------- */
 849
 850 static void sas_queue(struct sas_ha_struct *sas_ha)
 851 {
 852         struct scsi_core *core = &sas_ha->core;
 853         unsigned long flags;
 854         LIST_HEAD(q);
 855         int can_queue;
 856         int res;
 857         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 858
 859         spin_lock_irqsave(&core->task_queue_lock, flags);
 860         while (!kthread_should_stop() &&
 861                !list_empty(&core->task_queue)) {
 862
 863                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 864                 if (can_queue >= 0) {
 865                         can_queue = core->task_queue_size;
 866                         list_splice_init(&core->task_queue, &q);
 867                 } else {
 868                         struct list_head *a, *n;
 869
 870                         can_queue = sas_ha->lldd_queue_size;
 871                         list_for_each_safe(a, n, &core->task_queue) {
 872                                 list_move_tail(a, &q);
 873                                 if (--can_queue == 0)
 874                                         break;
 875                         }
 876                         can_queue = sas_ha->lldd_queue_size;
 877                 }
 878                 core->task_queue_size -= can_queue;
 879                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 880                 {
 881                         struct sas_task *task = list_entry(q.next,
 882                                                            struct sas_task,
 883                                                            list);
 884                         list_del_init(&q);
 885                         res = i->dft->lldd_execute_task(task, can_queue,
 886                                                         GFP_KERNEL);
 887                         if (unlikely(res))
 888                                 __list_add(&q, task->list.prev, &task->list);
 889                 }
 890                 spin_lock_irqsave(&core->task_queue_lock, flags);
 891                 if (res) {
 892                         list_splice_init(&q, &core->task_queue); /*at head*/
 893                         core->task_queue_size += can_queue;
 894                 }
 895         }
 896         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 897 }
 898
 899 /**
 900  * sas_queue_thread -- The Task Collector thread
 901  * @_sas_ha: pointer to struct sas_ha
 902  */
 903 static int sas_queue_thread(void *_sas_ha)
 904 {
 905         struct sas_ha_struct *sas_ha = _sas_ha;
 906
 907         while (1) {
 908                 set_current_state(TASK_INTERRUPTIBLE);
 909                 schedule();
 910                 sas_queue(sas_ha);
 911                 if (kthread_should_stop())
 912                         break;
 913         }
 914
 915         return 0;
 916 }
 917
 918 int sas_init_queue(struct sas_ha_struct *sas_ha)
 919 {
 920         struct scsi_core *core = &sas_ha->core;
 921
 922         spin_lock_init(&core->task_queue_lock);
 923         core->task_queue_size = 0;
 924         INIT_LIST_HEAD(&core->task_queue);
 925
 926         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 927                                          "sas_queue_%d", core->shost->host_no);
 928         if (IS_ERR(core->queue_thread))
 929                 return PTR_ERR(core->queue_thread);
 930         return 0;
 931 }
 932
 933 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 934 {
 935         unsigned long flags;
 936         struct scsi_core *core = &sas_ha->core;
 937         struct sas_task *task, *n;
 938
 939         kthread_stop(core->queue_thread);
 940
 941         if (!list_empty(&core->task_queue))
 942                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 943                             SAS_ADDR(sas_ha->sas_addr));
 944
 945         spin_lock_irqsave(&core->task_queue_lock, flags);
 946         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 947                 struct scsi_cmnd *cmd = task->uldd_task;
 948
 949                 list_del_init(&task->list);
 950
 951                 ASSIGN_SAS_TASK(cmd, NULL);
 952                 sas_free_task(task);
 953                 cmd->result = DID_ABORT << 16;
 954                 cmd->scsi_done(cmd);
 955         }
 956         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 957 }
 958
 959 /*
 960  * Call the LLDD task abort routine directly.  This function is intended for
 961  * use by upper layers that need to tell the LLDD to abort a task.
 962  */
 963 int __sas_task_abort(struct sas_task *task)
 964 {
 965         struct sas_internal *si =
 966                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 967         unsigned long flags;
 968         int res;
 969
 970         spin_lock_irqsave(&task->task_state_lock, flags);
 971         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 972             task->task_state_flags & SAS_TASK_STATE_DONE) {
 973                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 974                 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
 975                             task);
 976                 return 0;
 977         }
 978         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 979         spin_unlock_irqrestore(&task->task_state_lock, flags);
 980
 981         if (!si->dft->lldd_abort_task)
 982                 return -ENODEV;
 983
 984         res = si->dft->lldd_abort_task(task);
 985
 986         spin_lock_irqsave(&task->task_state_lock, flags);
 987         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
 988             (res == TMF_RESP_FUNC_COMPLETE))
 989         {
 990                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 991                 task->task_done(task);
 992                 return 0;
 993         }
 994
 995         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 996                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 997         spin_unlock_irqrestore(&task->task_state_lock, flags);
 998
 999         return -EAGAIN;
1000 }
1001
1002 /*
1003  * Tell an upper layer that it needs to initiate an abort for a given task.
1004  * This should only ever be called by an LLDD.
1005  */
1006 void sas_task_abort(struct sas_task *task)
1007 {
1008         struct scsi_cmnd *sc = task->uldd_task;
1009
1010         /* Escape for libsas internal commands */
1011         if (!sc) {
1012                 if (!del_timer(&task->timer))
1013                         return;
1014                 task->timer.function(task->timer.data);
1015                 return;
1016         }
1017
1018         if (dev_is_sata(task->dev)) {
1019                 sas_ata_task_abort(task);
1020         } else {
1021                 struct request_queue *q = sc->device->request_queue;
1022                 unsigned long flags;
1023
1024                 spin_lock_irqsave(q->queue_lock, flags);
1025                 blk_abort_request(sc->request);
1026                 spin_unlock_irqrestore(q->queue_lock, flags);
1027                 scsi_schedule_eh(sc->device->host);
1028         }
1029 }
1030
1031 int sas_slave_alloc(struct scsi_device *scsi_dev)
1032 {
1033         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1034
1035         if (dev_is_sata(dev))
1036                 return ata_sas_port_init(dev->sata_dev.ap);
1037
1038         return 0;
1039 }
1040
1041 void sas_target_destroy(struct scsi_target *starget)
1042 {
1043         struct domain_device *found_dev = starget->hostdata;
1044
1045         if (!found_dev)
1046                 return;
1047
1048         if (dev_is_sata(found_dev))
1049                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1050
1051         starget->hostdata = NULL;
1052         sas_put_device(found_dev);
1053 }
1054
1055 static void sas_parse_addr(u8 *sas_addr, const char *p)
1056 {
1057         int i;
1058         for (i = 0; i < SAS_ADDR_SIZE; i++) {
1059                 u8 h, l;
1060                 if (!*p)
1061                         break;
1062                 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1063                 p++;
1064                 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1065                 p++;
1066                 sas_addr[i] = (h<<4) | l;
1067         }
1068 }
1069
1070 #define SAS_STRING_ADDR_SIZE    16
1071
1072 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1073 {
1074         int res;
1075         const struct firmware *fw;
1076
1077         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1078         if (res)
1079                 return res;
1080
1081         if (fw->size < SAS_STRING_ADDR_SIZE) {
1082                 res = -ENODEV;
1083                 goto out;
1084         }
1085
1086         sas_parse_addr(addr, fw->data);
1087
1088 out:
1089         release_firmware(fw);
1090         return res;
1091 }
1092 EXPORT_SYMBOL_GPL(sas_request_addr);
1093
1094 EXPORT_SYMBOL_GPL(sas_queuecommand);
1095 EXPORT_SYMBOL_GPL(sas_target_alloc);
1096 EXPORT_SYMBOL_GPL(sas_slave_configure);
1097 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1098 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1099 EXPORT_SYMBOL_GPL(sas_bios_param);
1100 EXPORT_SYMBOL_GPL(__sas_task_abort);
1101 EXPORT_SYMBOL_GPL(sas_task_abort);
1102 EXPORT_SYMBOL_GPL(sas_phy_reset);
1103 EXPORT_SYMBOL_GPL(sas_phy_enable);
1104 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1105 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1106 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1107 EXPORT_SYMBOL_GPL(sas_target_destroy);
1108 EXPORT_SYMBOL_GPL(sas_ioctl);