drivers/scsi/libsas/sas_scsi_host.c

   1 /*
   2  * Serial Attached SCSI (SAS) class SCSI Host glue.
   3  *
   4  * Copyright (C) 2005 Adaptec, Inc.  All rights reserved.
   5  * Copyright (C) 2005 Luben Tuikov <luben_tuikov@adaptec.com>
   6  *
   7  * This file is licensed under GPLv2.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of the
  12  * License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful, but
  15  * WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  22  * USA
  23  *
  24  */
  25
  26 #include <linux/kthread.h>
  27 #include <linux/firmware.h>
  28 #include <linux/ctype.h>
  29
  30 #include "sas_internal.h"
  31
  32 #include <scsi/scsi_host.h>
  33 #include <scsi/scsi_device.h>
  34 #include <scsi/scsi_tcq.h>
  35 #include <scsi/scsi.h>
  36 #include <scsi/scsi_eh.h>
  37 #include <scsi/scsi_transport.h>
  38 #include <scsi/scsi_transport_sas.h>
  39 #include <scsi/sas_ata.h>
  40 #include "../scsi_sas_internal.h"
  41 #include "../scsi_transport_api.h"
  42 #include "../scsi_priv.h"
  43
  44 #include <linux/err.h>
  45 #include <linux/blkdev.h>
  46 #include <linux/freezer.h>
  47 #include <linux/gfp.h>
  48 #include <linux/scatterlist.h>
  49 #include <linux/libata.h>
  50
  51 /* ---------- SCSI Host glue ---------- */
  52
  53 static void sas_scsi_task_done(struct sas_task *task)
  54 {
  55         struct task_status_struct *ts = &task->task_status;
  56         struct scsi_cmnd *sc = task->uldd_task;
  57         int hs = 0, stat = 0;
  58
  59         if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
  60                 /* Aborted tasks will be completed by the error handler */
  61                 SAS_DPRINTK("task done but aborted\n");
  62                 return;
  63         }
  64
  65         if (unlikely(!sc)) {
  66                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  67                 list_del_init(&task->list);
  68                 sas_free_task(task);
  69                 return;
  70         }
  71
  72         if (ts->resp == SAS_TASK_UNDELIVERED) {
  73                 /* transport error */
  74                 hs = DID_NO_CONNECT;
  75         } else { /* ts->resp == SAS_TASK_COMPLETE */
  76                 /* task delivered, what happened afterwards? */
  77                 switch (ts->stat) {
  78                 case SAS_DEV_NO_RESPONSE:
  79                 case SAS_INTERRUPTED:
  80                 case SAS_PHY_DOWN:
  81                 case SAS_NAK_R_ERR:
  82                 case SAS_OPEN_TO:
  83                         hs = DID_NO_CONNECT;
  84                         break;
  85                 case SAS_DATA_UNDERRUN:
  86                         scsi_set_resid(sc, ts->residual);
  87                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  88                                 hs = DID_ERROR;
  89                         break;
  90                 case SAS_DATA_OVERRUN:
  91                         hs = DID_ERROR;
  92                         break;
  93                 case SAS_QUEUE_FULL:
  94                         hs = DID_SOFT_ERROR; /* retry */
  95                         break;
  96                 case SAS_DEVICE_UNKNOWN:
  97                         hs = DID_BAD_TARGET;
  98                         break;
  99                 case SAS_SG_ERR:
 100                         hs = DID_PARITY;
 101                         break;
 102                 case SAS_OPEN_REJECT:
 103                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
 104                                 hs = DID_SOFT_ERROR; /* retry */
 105                         else
 106                                 hs = DID_ERROR;
 107                         break;
 108                 case SAS_PROTO_RESPONSE:
 109                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
 110                                     "task; please report this\n",
 111                                     task->dev->port->ha->sas_ha_name);
 112                         break;
 113                 case SAS_ABORTED_TASK:
 114                         hs = DID_ABORT;
 115                         break;
 116                 case SAM_CHECK_COND:
 117                         memcpy(sc->sense_buffer, ts->buf,
 118                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 119                         stat = SAM_CHECK_COND;
 120                         break;
 121                 default:
 122                         stat = ts->stat;
 123                         break;
 124                 }
 125         }
 126         ASSIGN_SAS_TASK(sc, NULL);
 127         sc->result = (hs << 16) | stat;
 128         list_del_init(&task->list);
 129         sas_free_task(task);
 130         sc->scsi_done(sc);
 131 }
 132
 133 static 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         task->uldd_task = cmd;
 155         ASSIGN_SAS_TASK(cmd, task);
 156
 157         task->dev = dev;
 158         task->task_proto = task->dev->tproto; /* BUG_ON(!SSP) */
 159
 160         task->ssp_task.retry_count = 1;
 161         int_to_scsilun(cmd->device->lun, &lun);
 162         memcpy(task->ssp_task.LUN, &lun.scsi_lun, 8);
 163         task->ssp_task.task_attr = sas_scsi_get_task_attr(cmd);
 164         memcpy(task->ssp_task.cdb, cmd->cmnd, 16);
 165
 166         task->scatter = scsi_sglist(cmd);
 167         task->num_scatter = scsi_sg_count(cmd);
 168         task->total_xfer_len = scsi_bufflen(cmd);
 169         task->data_dir = cmd->sc_data_direction;
 170
 171         task->task_done = sas_scsi_task_done;
 172
 173         return task;
 174 }
 175
 176 int sas_queue_up(struct sas_task *task)
 177 {
 178         struct sas_ha_struct *sas_ha = task->dev->port->ha;
 179         struct scsi_core *core = &sas_ha->core;
 180         unsigned long flags;
 181         LIST_HEAD(list);
 182
 183         spin_lock_irqsave(&core->task_queue_lock, flags);
 184         if (sas_ha->lldd_queue_size < core->task_queue_size + 1) {
 185                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 186                 return -SAS_QUEUE_FULL;
 187         }
 188         list_add_tail(&task->list, &core->task_queue);
 189         core->task_queue_size += 1;
 190         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 191         wake_up_process(core->queue_thread);
 192
 193         return 0;
 194 }
 195
 196 /**
 197  * sas_queuecommand -- Enqueue a command for processing
 198  * @parameters: See SCSI Core documentation
 199  *
 200  * Note: XXX: Remove the host unlock/lock pair when SCSI Core can
 201  * call us without holding an IRQ spinlock...
 202  */
 203 int sas_queuecommand(struct scsi_cmnd *cmd,
 204                      void (*scsi_done)(struct scsi_cmnd *))
 205         __releases(host->host_lock)
 206         __acquires(dev->sata_dev.ap->lock)
 207         __releases(dev->sata_dev.ap->lock)
 208         __acquires(host->host_lock)
 209 {
 210         int res = 0;
 211         struct domain_device *dev = cmd_to_domain_dev(cmd);
 212         struct Scsi_Host *host = cmd->device->host;
 213         struct sas_internal *i = to_sas_internal(host->transportt);
 214
 215         spin_unlock_irq(host->host_lock);
 216
 217         {
 218                 struct sas_ha_struct *sas_ha = dev->port->ha;
 219                 struct sas_task *task;
 220
 221                 if (dev_is_sata(dev)) {
 222                         unsigned long flags;
 223
 224                         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 225                         res = ata_sas_queuecmd(cmd, scsi_done,
 226                                                dev->sata_dev.ap);
 227                         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 228                         goto out;
 229                 }
 230
 231                 res = -ENOMEM;
 232                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
 233                 if (!task)
 234                         goto out;
 235
 236                 cmd->scsi_done = scsi_done;
 237                 /* Queue up, Direct Mode or Task Collector Mode. */
 238                 if (sas_ha->lldd_max_execute_num < 2)
 239                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 240                 else
 241                         res = sas_queue_up(task);
 242
 243                 /* Examine */
 244                 if (res) {
 245                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 246                         ASSIGN_SAS_TASK(cmd, NULL);
 247                         sas_free_task(task);
 248                         if (res == -SAS_QUEUE_FULL) {
 249                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 250                                 res = 0;
 251                                 scsi_done(cmd);
 252                         }
 253                         goto out;
 254                 }
 255         }
 256 out:
 257         spin_lock_irq(host->host_lock);
 258         return res;
 259 }
 260
 261 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
 262 {
 263         struct sas_task *task = TO_SAS_TASK(cmd);
 264         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
 265
 266         /* remove the aborted task flag to allow the task to be
 267          * completed now. At this point, we only get called following
 268          * an actual abort of the task, so we should be guaranteed not
 269          * to be racing with any completions from the LLD (hence we
 270          * don't need the task state lock to clear the flag) */
 271         task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 272         /* Now call task_done.  However, task will be free'd after
 273          * this */
 274         task->task_done(task);
 275         /* now finish the command and move it on to the error
 276          * handler done list, this also takes it off the
 277          * error handler pending list */
 278         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
 279 }
 280
 281 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 282 {
 283         struct scsi_cmnd *cmd, *n;
 284
 285         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 286                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
 287                     cmd->device->lun == my_cmd->device->lun)
 288                         sas_eh_finish_cmd(cmd);
 289         }
 290 }
 291
 292 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 293                                      struct domain_device *dev)
 294 {
 295         struct scsi_cmnd *cmd, *n;
 296
 297         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 298                 struct domain_device *x = cmd_to_domain_dev(cmd);
 299
 300                 if (x == dev)
 301                         sas_eh_finish_cmd(cmd);
 302         }
 303 }
 304
 305 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 306                                       struct asd_sas_port *port)
 307 {
 308         struct scsi_cmnd *cmd, *n;
 309
 310         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 311                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 312                 struct asd_sas_port *x = dev->port;
 313
 314                 if (x == port)
 315                         sas_eh_finish_cmd(cmd);
 316         }
 317 }
 318
 319 enum task_disposition {
 320         TASK_IS_DONE,
 321         TASK_IS_ABORTED,
 322         TASK_IS_AT_LU,
 323         TASK_IS_NOT_AT_LU,
 324         TASK_ABORT_FAILED,
 325 };
 326
 327 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 328 {
 329         struct sas_ha_struct *ha = task->dev->port->ha;
 330         unsigned long flags;
 331         int i, res;
 332         struct sas_internal *si =
 333                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 334
 335         if (ha->lldd_max_execute_num > 1) {
 336                 struct scsi_core *core = &ha->core;
 337                 struct sas_task *t, *n;
 338
 339                 spin_lock_irqsave(&core->task_queue_lock, flags);
 340                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 341                         if (task == t) {
 342                                 list_del_init(&t->list);
 343                                 spin_unlock_irqrestore(&core->task_queue_lock,
 344                                                        flags);
 345                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 346                                             "task_queue\n",
 347                                             __func__, task);
 348                                 return TASK_IS_ABORTED;
 349                         }
 350                 }
 351                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 352         }
 353
 354         for (i = 0; i < 5; i++) {
 355                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
 356                 res = si->dft->lldd_abort_task(task);
 357
 358                 spin_lock_irqsave(&task->task_state_lock, flags);
 359                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 360                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 361                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 362                                     task);
 363                         return TASK_IS_DONE;
 364                 }
 365                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 366
 367                 if (res == TMF_RESP_FUNC_COMPLETE) {
 368                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 369                                     __func__, task);
 370                         return TASK_IS_ABORTED;
 371                 } else if (si->dft->lldd_query_task) {
 372                         SAS_DPRINTK("%s: querying task 0x%p\n",
 373                                     __func__, task);
 374                         res = si->dft->lldd_query_task(task);
 375                         switch (res) {
 376                         case TMF_RESP_FUNC_SUCC:
 377                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 378                                             __func__, task);
 379                                 return TASK_IS_AT_LU;
 380                         case TMF_RESP_FUNC_COMPLETE:
 381                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 382                                             __func__, task);
 383                                 return TASK_IS_NOT_AT_LU;
 384                         case TMF_RESP_FUNC_FAILED:
 385                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 386                                                 __func__, task);
 387                                 return TASK_ABORT_FAILED;
 388                         }
 389
 390                 }
 391         }
 392         return res;
 393 }
 394
 395 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 396 {
 397         int res = TMF_RESP_FUNC_FAILED;
 398         struct scsi_lun lun;
 399         struct sas_internal *i =
 400                 to_sas_internal(dev->port->ha->core.shost->transportt);
 401
 402         int_to_scsilun(cmd->device->lun, &lun);
 403
 404         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 405                     SAS_ADDR(dev->sas_addr),
 406                     cmd->device->lun);
 407
 408         if (i->dft->lldd_abort_task_set)
 409                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 410
 411         if (res == TMF_RESP_FUNC_FAILED) {
 412                 if (i->dft->lldd_clear_task_set)
 413                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 414         }
 415
 416         if (res == TMF_RESP_FUNC_FAILED) {
 417                 if (i->dft->lldd_lu_reset)
 418                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 419         }
 420
 421         return res;
 422 }
 423
 424 static int sas_recover_I_T(struct domain_device *dev)
 425 {
 426         int res = TMF_RESP_FUNC_FAILED;
 427         struct sas_internal *i =
 428                 to_sas_internal(dev->port->ha->core.shost->transportt);
 429
 430         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 431                     SAS_ADDR(dev->sas_addr));
 432
 433         if (i->dft->lldd_I_T_nexus_reset)
 434                 res = i->dft->lldd_I_T_nexus_reset(dev);
 435
 436         return res;
 437 }
 438
 439 /* Find the sas_phy that's attached to this device */
 440 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
 441 {
 442         struct domain_device *pdev = dev->parent;
 443         struct ex_phy *exphy = NULL;
 444         int i;
 445
 446         /* Directly attached device */
 447         if (!pdev)
 448                 return dev->port->phy;
 449
 450         /* Otherwise look in the expander */
 451         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 452                 if (!memcmp(dev->sas_addr,
 453                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 454                             SAS_ADDR_SIZE)) {
 455                         exphy = &pdev->ex_dev.ex_phy[i];
 456                         break;
 457                 }
 458
 459         BUG_ON(!exphy);
 460         return exphy->phy;
 461 }
 462 EXPORT_SYMBOL_GPL(sas_find_local_phy);
 463
 464 /* Attempt to send a LUN reset message to a device */
 465 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 466 {
 467         struct domain_device *dev = cmd_to_domain_dev(cmd);
 468         struct sas_internal *i =
 469                 to_sas_internal(dev->port->ha->core.shost->transportt);
 470         struct scsi_lun lun;
 471         int res;
 472
 473         int_to_scsilun(cmd->device->lun, &lun);
 474
 475         if (!i->dft->lldd_lu_reset)
 476                 return FAILED;
 477
 478         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 479         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 480                 return SUCCESS;
 481
 482         return FAILED;
 483 }
 484
 485 /* Attempt to send a phy (bus) reset */
 486 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 487 {
 488         struct domain_device *dev = cmd_to_domain_dev(cmd);
 489         struct sas_phy *phy = sas_find_local_phy(dev);
 490         int res;
 491
 492         res = sas_phy_reset(phy, 1);
 493         if (res)
 494                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 495                             kobject_name(&phy->dev.kobj),
 496                             res);
 497         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 498                 return SUCCESS;
 499
 500         return FAILED;
 501 }
 502
 503 /* Try to reset a device */
 504 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
 505 {
 506         int res;
 507         struct Scsi_Host *shost = cmd->device->host;
 508
 509         if (!shost->hostt->eh_device_reset_handler)
 510                 goto try_bus_reset;
 511
 512         res = shost->hostt->eh_device_reset_handler(cmd);
 513         if (res == SUCCESS)
 514                 return res;
 515
 516 try_bus_reset:
 517         if (shost->hostt->eh_bus_reset_handler)
 518                 return shost->hostt->eh_bus_reset_handler(cmd);
 519
 520         return FAILED;
 521 }
 522
 523 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 524                                     struct list_head *work_q,
 525                                     struct list_head *done_q)
 526 {
 527         struct scsi_cmnd *cmd, *n;
 528         enum task_disposition res = TASK_IS_DONE;
 529         int tmf_resp, need_reset;
 530         struct sas_internal *i = to_sas_internal(shost->transportt);
 531         unsigned long flags;
 532         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 533
 534 Again:
 535         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 536                 struct sas_task *task = TO_SAS_TASK(cmd);
 537
 538                 if (!task)
 539                         continue;
 540
 541                 list_del_init(&cmd->eh_entry);
 542
 543                 spin_lock_irqsave(&task->task_state_lock, flags);
 544                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 545                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 546
 547                 if (need_reset) {
 548                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
 549                                     __func__, task);
 550                         goto reset;
 551                 }
 552
 553                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 554                 res = sas_scsi_find_task(task);
 555
 556                 cmd->eh_eflags = 0;
 557
 558                 switch (res) {
 559                 case TASK_IS_DONE:
 560                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 561                                     task);
 562                         sas_eh_finish_cmd(cmd);
 563                         continue;
 564                 case TASK_IS_ABORTED:
 565                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 566                                     __func__, task);
 567                         sas_eh_finish_cmd(cmd);
 568                         continue;
 569                 case TASK_IS_AT_LU:
 570                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 571  reset:
 572                         tmf_resp = sas_recover_lu(task->dev, cmd);
 573                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 574                                 SAS_DPRINTK("dev %016llx LU %x is "
 575                                             "recovered\n",
 576                                             SAS_ADDR(task->dev),
 577                                             cmd->device->lun);
 578                                 sas_eh_finish_cmd(cmd);
 579                                 sas_scsi_clear_queue_lu(work_q, cmd);
 580                                 goto Again;
 581                         }
 582                         /* fallthrough */
 583                 case TASK_IS_NOT_AT_LU:
 584                 case TASK_ABORT_FAILED:
 585                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 586                                     task);
 587                         tmf_resp = sas_recover_I_T(task->dev);
 588                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 589                                 struct domain_device *dev = task->dev;
 590                                 SAS_DPRINTK("I_T %016llx recovered\n",
 591                                             SAS_ADDR(task->dev->sas_addr));
 592                                 sas_eh_finish_cmd(cmd);
 593                                 sas_scsi_clear_queue_I_T(work_q, dev);
 594                                 goto Again;
 595                         }
 596                         /* Hammer time :-) */
 597                         try_to_reset_cmd_device(cmd);
 598                         if (i->dft->lldd_clear_nexus_port) {
 599                                 struct asd_sas_port *port = task->dev->port;
 600                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 601                                             port->id);
 602                                 res = i->dft->lldd_clear_nexus_port(port);
 603                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 604                                         SAS_DPRINTK("clear nexus port:%d "
 605                                                     "succeeded\n", port->id);
 606                                         sas_eh_finish_cmd(cmd);
 607                                         sas_scsi_clear_queue_port(work_q,
 608                                                                   port);
 609                                         goto Again;
 610                                 }
 611                         }
 612                         if (i->dft->lldd_clear_nexus_ha) {
 613                                 SAS_DPRINTK("clear nexus ha\n");
 614                                 res = i->dft->lldd_clear_nexus_ha(ha);
 615                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 616                                         SAS_DPRINTK("clear nexus ha "
 617                                                     "succeeded\n");
 618                                         sas_eh_finish_cmd(cmd);
 619                                         goto clear_q;
 620                                 }
 621                         }
 622                         /* If we are here -- this means that no amount
 623                          * of effort could recover from errors.  Quite
 624                          * possibly the HA just disappeared.
 625                          */
 626                         SAS_DPRINTK("error from  device %llx, LUN %x "
 627                                     "couldn't be recovered in any way\n",
 628                                     SAS_ADDR(task->dev->sas_addr),
 629                                     cmd->device->lun);
 630
 631                         sas_eh_finish_cmd(cmd);
 632                         goto clear_q;
 633                 }
 634         }
 635         return list_empty(work_q);
 636 clear_q:
 637         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
 638         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 639                 sas_eh_finish_cmd(cmd);
 640
 641         return list_empty(work_q);
 642 }
 643
 644 void sas_scsi_recover_host(struct Scsi_Host *shost)
 645 {
 646         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 647         unsigned long flags;
 648         LIST_HEAD(eh_work_q);
 649
 650         spin_lock_irqsave(shost->host_lock, flags);
 651         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 652         spin_unlock_irqrestore(shost->host_lock, flags);
 653
 654         SAS_DPRINTK("Enter %s\n", __func__);
 655         /*
 656          * Deal with commands that still have SAS tasks (i.e. they didn't
 657          * complete via the normal sas_task completion mechanism)
 658          */
 659         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 660                 goto out;
 661
 662         /*
 663          * Now deal with SCSI commands that completed ok but have a an error
 664          * code (and hopefully sense data) attached.  This is roughly what
 665          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 666          * command we see here has no sas_task and is thus unknown to the HA.
 667          */
 668         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 669                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 670
 671 out:
 672         scsi_eh_flush_done_q(&ha->eh_done_q);
 673         SAS_DPRINTK("--- Exit %s\n", __func__);
 674         return;
 675 }
 676
 677 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 678 {
 679         struct sas_task *task = TO_SAS_TASK(cmd);
 680         unsigned long flags;
 681
 682         if (!task) {
 683                 cmd->request->timeout /= 2;
 684                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 685                             cmd, task, (cmd->request->timeout ?
 686                             "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
 687                 if (!cmd->request->timeout)
 688                         return BLK_EH_NOT_HANDLED;
 689                 return BLK_EH_RESET_TIMER;
 690         }
 691
 692         spin_lock_irqsave(&task->task_state_lock, flags);
 693         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 694         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 695                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 696                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
 697                             "BLK_EH_HANDLED\n", cmd, task);
 698                 return BLK_EH_HANDLED;
 699         }
 700         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 701                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 702                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 703                             "BLK_EH_RESET_TIMER\n",
 704                             cmd, task);
 705                 return BLK_EH_RESET_TIMER;
 706         }
 707         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 708         spin_unlock_irqrestore(&task->task_state_lock, flags);
 709
 710         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
 711                     cmd, task);
 712
 713         return BLK_EH_NOT_HANDLED;
 714 }
 715
 716 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 717 {
 718         struct domain_device *dev = sdev_to_domain_dev(sdev);
 719
 720         if (dev_is_sata(dev))
 721                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
 722
 723         return -EINVAL;
 724 }
 725
 726 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 727 {
 728         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 729         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 730         struct domain_device *found_dev = NULL;
 731         int i;
 732         unsigned long flags;
 733
 734         spin_lock_irqsave(&ha->phy_port_lock, flags);
 735         for (i = 0; i < ha->num_phys; i++) {
 736                 struct asd_sas_port *port = ha->sas_port[i];
 737                 struct domain_device *dev;
 738
 739                 spin_lock(&port->dev_list_lock);
 740                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 741                         if (rphy == dev->rphy) {
 742                                 found_dev = dev;
 743                                 spin_unlock(&port->dev_list_lock);
 744                                 goto found;
 745                         }
 746                 }
 747                 spin_unlock(&port->dev_list_lock);
 748         }
 749  found:
 750         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 751
 752         return found_dev;
 753 }
 754
 755 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 756 {
 757         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 758
 759         return sas_find_dev_by_rphy(rphy);
 760 }
 761
 762 int sas_target_alloc(struct scsi_target *starget)
 763 {
 764         struct domain_device *found_dev = sas_find_target(starget);
 765         int res;
 766
 767         if (!found_dev)
 768                 return -ENODEV;
 769
 770         if (dev_is_sata(found_dev)) {
 771                 res = sas_ata_init_host_and_port(found_dev, starget);
 772                 if (res)
 773                         return res;
 774         }
 775
 776         starget->hostdata = found_dev;
 777         return 0;
 778 }
 779
 780 #define SAS_DEF_QD 32
 781 #define SAS_MAX_QD 64
 782
 783 int sas_slave_configure(struct scsi_device *scsi_dev)
 784 {
 785         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 786         struct sas_ha_struct *sas_ha;
 787
 788         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 789
 790         if (dev_is_sata(dev)) {
 791                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 792                 return 0;
 793         }
 794
 795         sas_ha = dev->port->ha;
 796
 797         sas_read_port_mode_page(scsi_dev);
 798
 799         if (scsi_dev->tagged_supported) {
 800                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 801                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 802         } else {
 803                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 804                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 805                             scsi_dev->lun);
 806                 scsi_dev->tagged_supported = 0;
 807                 scsi_set_tag_type(scsi_dev, 0);
 808                 scsi_deactivate_tcq(scsi_dev, 1);
 809         }
 810
 811         scsi_dev->allow_restart = 1;
 812
 813         return 0;
 814 }
 815
 816 void sas_slave_destroy(struct scsi_device *scsi_dev)
 817 {
 818         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 819
 820         if (dev_is_sata(dev))
 821                 ata_port_disable(dev->sata_dev.ap);
 822 }
 823
 824 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth,
 825                            int reason)
 826 {
 827         int res = min(new_depth, SAS_MAX_QD);
 828
 829         if (reason != SCSI_QDEPTH_DEFAULT)
 830                 return -EOPNOTSUPP;
 831
 832         if (scsi_dev->tagged_supported)
 833                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 834                                         res);
 835         else {
 836                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 837                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 838                            SAS_ADDR(dev->sas_addr),
 839                            scsi_dev->lun);
 840                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 841                 res = 1;
 842         }
 843
 844         return res;
 845 }
 846
 847 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 848 {
 849         if (!scsi_dev->tagged_supported)
 850                 return 0;
 851
 852         scsi_deactivate_tcq(scsi_dev, 1);
 853
 854         scsi_set_tag_type(scsi_dev, qt);
 855         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 856
 857         return qt;
 858 }
 859
 860 int sas_bios_param(struct scsi_device *scsi_dev,
 861                           struct block_device *bdev,
 862                           sector_t capacity, int *hsc)
 863 {
 864         hsc[0] = 255;
 865         hsc[1] = 63;
 866         sector_div(capacity, 255*63);
 867         hsc[2] = capacity;
 868
 869         return 0;
 870 }
 871
 872 /* ---------- Task Collector Thread implementation ---------- */
 873
 874 static void sas_queue(struct sas_ha_struct *sas_ha)
 875 {
 876         struct scsi_core *core = &sas_ha->core;
 877         unsigned long flags;
 878         LIST_HEAD(q);
 879         int can_queue;
 880         int res;
 881         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 882
 883         spin_lock_irqsave(&core->task_queue_lock, flags);
 884         while (!kthread_should_stop() &&
 885                !list_empty(&core->task_queue)) {
 886
 887                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 888                 if (can_queue >= 0) {
 889                         can_queue = core->task_queue_size;
 890                         list_splice_init(&core->task_queue, &q);
 891                 } else {
 892                         struct list_head *a, *n;
 893
 894                         can_queue = sas_ha->lldd_queue_size;
 895                         list_for_each_safe(a, n, &core->task_queue) {
 896                                 list_move_tail(a, &q);
 897                                 if (--can_queue == 0)
 898                                         break;
 899                         }
 900                         can_queue = sas_ha->lldd_queue_size;
 901                 }
 902                 core->task_queue_size -= can_queue;
 903                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 904                 {
 905                         struct sas_task *task = list_entry(q.next,
 906                                                            struct sas_task,
 907                                                            list);
 908                         list_del_init(&q);
 909                         res = i->dft->lldd_execute_task(task, can_queue,
 910                                                         GFP_KERNEL);
 911                         if (unlikely(res))
 912                                 __list_add(&q, task->list.prev, &task->list);
 913                 }
 914                 spin_lock_irqsave(&core->task_queue_lock, flags);
 915                 if (res) {
 916                         list_splice_init(&q, &core->task_queue); /*at head*/
 917                         core->task_queue_size += can_queue;
 918                 }
 919         }
 920         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 921 }
 922
 923 /**
 924  * sas_queue_thread -- The Task Collector thread
 925  * @_sas_ha: pointer to struct sas_ha
 926  */
 927 static int sas_queue_thread(void *_sas_ha)
 928 {
 929         struct sas_ha_struct *sas_ha = _sas_ha;
 930
 931         while (1) {
 932                 set_current_state(TASK_INTERRUPTIBLE);
 933                 schedule();
 934                 sas_queue(sas_ha);
 935                 if (kthread_should_stop())
 936                         break;
 937         }
 938
 939         return 0;
 940 }
 941
 942 int sas_init_queue(struct sas_ha_struct *sas_ha)
 943 {
 944         struct scsi_core *core = &sas_ha->core;
 945
 946         spin_lock_init(&core->task_queue_lock);
 947         core->task_queue_size = 0;
 948         INIT_LIST_HEAD(&core->task_queue);
 949
 950         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 951                                          "sas_queue_%d", core->shost->host_no);
 952         if (IS_ERR(core->queue_thread))
 953                 return PTR_ERR(core->queue_thread);
 954         return 0;
 955 }
 956
 957 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 958 {
 959         unsigned long flags;
 960         struct scsi_core *core = &sas_ha->core;
 961         struct sas_task *task, *n;
 962
 963         kthread_stop(core->queue_thread);
 964
 965         if (!list_empty(&core->task_queue))
 966                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 967                             SAS_ADDR(sas_ha->sas_addr));
 968
 969         spin_lock_irqsave(&core->task_queue_lock, flags);
 970         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 971                 struct scsi_cmnd *cmd = task->uldd_task;
 972
 973                 list_del_init(&task->list);
 974
 975                 ASSIGN_SAS_TASK(cmd, NULL);
 976                 sas_free_task(task);
 977                 cmd->result = DID_ABORT << 16;
 978                 cmd->scsi_done(cmd);
 979         }
 980         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 981 }
 982
 983 /*
 984  * Call the LLDD task abort routine directly.  This function is intended for
 985  * use by upper layers that need to tell the LLDD to abort a task.
 986  */
 987 int __sas_task_abort(struct sas_task *task)
 988 {
 989         struct sas_internal *si =
 990                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 991         unsigned long flags;
 992         int res;
 993
 994         spin_lock_irqsave(&task->task_state_lock, flags);
 995         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 996             task->task_state_flags & SAS_TASK_STATE_DONE) {
 997                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 998                 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
 999                             task);
1000                 return 0;
1001         }
1002         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
1003         spin_unlock_irqrestore(&task->task_state_lock, flags);
1004
1005         if (!si->dft->lldd_abort_task)
1006                 return -ENODEV;
1007
1008         res = si->dft->lldd_abort_task(task);
1009
1010         spin_lock_irqsave(&task->task_state_lock, flags);
1011         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1012             (res == TMF_RESP_FUNC_COMPLETE))
1013         {
1014                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1015                 task->task_done(task);
1016                 return 0;
1017         }
1018
1019         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1020                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1021         spin_unlock_irqrestore(&task->task_state_lock, flags);
1022
1023         return -EAGAIN;
1024 }
1025
1026 /*
1027  * Tell an upper layer that it needs to initiate an abort for a given task.
1028  * This should only ever be called by an LLDD.
1029  */
1030 void sas_task_abort(struct sas_task *task)
1031 {
1032         struct scsi_cmnd *sc = task->uldd_task;
1033
1034         /* Escape for libsas internal commands */
1035         if (!sc) {
1036                 if (!del_timer(&task->timer))
1037                         return;
1038                 task->timer.function(task->timer.data);
1039                 return;
1040         }
1041
1042         if (dev_is_sata(task->dev)) {
1043                 sas_ata_task_abort(task);
1044                 return;
1045         }
1046
1047         blk_abort_request(sc->request);
1048         scsi_schedule_eh(sc->device->host);
1049 }
1050
1051 int sas_slave_alloc(struct scsi_device *scsi_dev)
1052 {
1053         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1054
1055         if (dev_is_sata(dev))
1056                 return ata_sas_port_init(dev->sata_dev.ap);
1057
1058         return 0;
1059 }
1060
1061 void sas_target_destroy(struct scsi_target *starget)
1062 {
1063         struct domain_device *found_dev = sas_find_target(starget);
1064
1065         if (!found_dev)
1066                 return;
1067
1068         if (dev_is_sata(found_dev))
1069                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1070
1071         return;
1072 }
1073
1074 static void sas_parse_addr(u8 *sas_addr, const char *p)
1075 {
1076         int i;
1077         for (i = 0; i < SAS_ADDR_SIZE; i++) {
1078                 u8 h, l;
1079                 if (!*p)
1080                         break;
1081                 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1082                 p++;
1083                 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1084                 p++;
1085                 sas_addr[i] = (h<<4) | l;
1086         }
1087 }
1088
1089 #define SAS_STRING_ADDR_SIZE    16
1090
1091 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1092 {
1093         int res;
1094         const struct firmware *fw;
1095
1096         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1097         if (res)
1098                 return res;
1099
1100         if (fw->size < SAS_STRING_ADDR_SIZE) {
1101                 res = -ENODEV;
1102                 goto out;
1103         }
1104
1105         sas_parse_addr(addr, fw->data);
1106
1107 out:
1108         release_firmware(fw);
1109         return res;
1110 }
1111 EXPORT_SYMBOL_GPL(sas_request_addr);
1112
1113 EXPORT_SYMBOL_GPL(sas_queuecommand);
1114 EXPORT_SYMBOL_GPL(sas_target_alloc);
1115 EXPORT_SYMBOL_GPL(sas_slave_configure);
1116 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1117 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1118 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1119 EXPORT_SYMBOL_GPL(sas_bios_param);
1120 EXPORT_SYMBOL_GPL(__sas_task_abort);
1121 EXPORT_SYMBOL_GPL(sas_task_abort);
1122 EXPORT_SYMBOL_GPL(sas_phy_reset);
1123 EXPORT_SYMBOL_GPL(sas_phy_enable);
1124 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1125 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1126 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1127 EXPORT_SYMBOL_GPL(sas_target_destroy);
1128 EXPORT_SYMBOL_GPL(sas_ioctl);