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 #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/scatterlist.h>
  48 #include <linux/libata.h>
  49
  50 /* ---------- SCSI Host glue ---------- */
  51
  52 static void sas_scsi_task_done(struct sas_task *task)
  53 {
  54         struct task_status_struct *ts = &task->task_status;
  55         struct scsi_cmnd *sc = task->uldd_task;
  56         int hs = 0, stat = 0;
  57
  58         if (unlikely(task->task_state_flags & SAS_TASK_STATE_ABORTED)) {
  59                 /* Aborted tasks will be completed by the error handler */
  60                 SAS_DPRINTK("task done but aborted\n");
  61                 return;
  62         }
  63
  64         if (unlikely(!sc)) {
  65                 SAS_DPRINTK("task_done called with non existing SCSI cmnd!\n");
  66                 list_del_init(&task->list);
  67                 sas_free_task(task);
  68                 return;
  69         }
  70
  71         if (ts->resp == SAS_TASK_UNDELIVERED) {
  72                 /* transport error */
  73                 hs = DID_NO_CONNECT;
  74         } else { /* ts->resp == SAS_TASK_COMPLETE */
  75                 /* task delivered, what happened afterwards? */
  76                 switch (ts->stat) {
  77                 case SAS_DEV_NO_RESPONSE:
  78                 case SAS_INTERRUPTED:
  79                 case SAS_PHY_DOWN:
  80                 case SAS_NAK_R_ERR:
  81                 case SAS_OPEN_TO:
  82                         hs = DID_NO_CONNECT;
  83                         break;
  84                 case SAS_DATA_UNDERRUN:
  85                         scsi_set_resid(sc, ts->residual);
  86                         if (scsi_bufflen(sc) - scsi_get_resid(sc) < sc->underflow)
  87                                 hs = DID_ERROR;
  88                         break;
  89                 case SAS_DATA_OVERRUN:
  90                         hs = DID_ERROR;
  91                         break;
  92                 case SAS_QUEUE_FULL:
  93                         hs = DID_SOFT_ERROR; /* retry */
  94                         break;
  95                 case SAS_DEVICE_UNKNOWN:
  96                         hs = DID_BAD_TARGET;
  97                         break;
  98                 case SAS_SG_ERR:
  99                         hs = DID_PARITY;
 100                         break;
 101                 case SAS_OPEN_REJECT:
 102                         if (ts->open_rej_reason == SAS_OREJ_RSVD_RETRY)
 103                                 hs = DID_SOFT_ERROR; /* retry */
 104                         else
 105                                 hs = DID_ERROR;
 106                         break;
 107                 case SAS_PROTO_RESPONSE:
 108                         SAS_DPRINTK("LLDD:%s sent SAS_PROTO_RESP for an SSP "
 109                                     "task; please report this\n",
 110                                     task->dev->port->ha->sas_ha_name);
 111                         break;
 112                 case SAS_ABORTED_TASK:
 113                         hs = DID_ABORT;
 114                         break;
 115                 case SAM_CHECK_COND:
 116                         memcpy(sc->sense_buffer, ts->buf,
 117                                min(SCSI_SENSE_BUFFERSIZE, ts->buf_valid_size));
 118                         stat = SAM_CHECK_COND;
 119                         break;
 120                 default:
 121                         stat = ts->stat;
 122                         break;
 123                 }
 124         }
 125         ASSIGN_SAS_TASK(sc, NULL);
 126         sc->result = (hs << 16) | stat;
 127         list_del_init(&task->list);
 128         sas_free_task(task);
 129         sc->scsi_done(sc);
 130 }
 131
 132 static enum task_attribute sas_scsi_get_task_attr(struct scsi_cmnd *cmd)
 133 {
 134         enum task_attribute ta = TASK_ATTR_SIMPLE;
 135         if (cmd->request && blk_rq_tagged(cmd->request)) {
 136                 if (cmd->device->ordered_tags &&
 137                     (cmd->request->cmd_flags & REQ_HARDBARRIER))
 138                         ta = TASK_ATTR_ORDERED;
 139         }
 140         return ta;
 141 }
 142
 143 static struct sas_task *sas_create_task(struct scsi_cmnd *cmd,
 144                                                struct domain_device *dev,
 145                                                gfp_t gfp_flags)
 146 {
 147         struct sas_task *task = sas_alloc_task(gfp_flags);
 148         struct scsi_lun lun;
 149
 150         if (!task)
 151                 return NULL;
 152
 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 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         __releases(host->host_lock)
 205         __acquires(dev->sata_dev.ap->lock)
 206         __releases(dev->sata_dev.ap->lock)
 207         __acquires(host->host_lock)
 208 {
 209         int res = 0;
 210         struct domain_device *dev = cmd_to_domain_dev(cmd);
 211         struct Scsi_Host *host = cmd->device->host;
 212         struct sas_internal *i = to_sas_internal(host->transportt);
 213
 214         spin_unlock_irq(host->host_lock);
 215
 216         {
 217                 struct sas_ha_struct *sas_ha = dev->port->ha;
 218                 struct sas_task *task;
 219
 220                 if (dev_is_sata(dev)) {
 221                         unsigned long flags;
 222
 223                         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
 224                         res = ata_sas_queuecmd(cmd, scsi_done,
 225                                                dev->sata_dev.ap);
 226                         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
 227                         goto out;
 228                 }
 229
 230                 res = -ENOMEM;
 231                 task = sas_create_task(cmd, dev, GFP_ATOMIC);
 232                 if (!task)
 233                         goto out;
 234
 235                 cmd->scsi_done = scsi_done;
 236                 /* Queue up, Direct Mode or Task Collector Mode. */
 237                 if (sas_ha->lldd_max_execute_num < 2)
 238                         res = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 239                 else
 240                         res = sas_queue_up(task);
 241
 242                 /* Examine */
 243                 if (res) {
 244                         SAS_DPRINTK("lldd_execute_task returned: %d\n", res);
 245                         ASSIGN_SAS_TASK(cmd, NULL);
 246                         sas_free_task(task);
 247                         if (res == -SAS_QUEUE_FULL) {
 248                                 cmd->result = DID_SOFT_ERROR << 16; /* retry */
 249                                 res = 0;
 250                                 scsi_done(cmd);
 251                         }
 252                         goto out;
 253                 }
 254         }
 255 out:
 256         spin_lock_irq(host->host_lock);
 257         return res;
 258 }
 259
 260 static void sas_eh_finish_cmd(struct scsi_cmnd *cmd)
 261 {
 262         struct sas_task *task = TO_SAS_TASK(cmd);
 263         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(cmd->device->host);
 264
 265         /* remove the aborted task flag to allow the task to be
 266          * completed now. At this point, we only get called following
 267          * an actual abort of the task, so we should be guaranteed not
 268          * to be racing with any completions from the LLD (hence we
 269          * don't need the task state lock to clear the flag) */
 270         task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 271         /* Now call task_done.  However, task will be free'd after
 272          * this */
 273         task->task_done(task);
 274         /* now finish the command and move it on to the error
 275          * handler done list, this also takes it off the
 276          * error handler pending list */
 277         scsi_eh_finish_cmd(cmd, &sas_ha->eh_done_q);
 278 }
 279
 280 static void sas_scsi_clear_queue_lu(struct list_head *error_q, struct scsi_cmnd *my_cmd)
 281 {
 282         struct scsi_cmnd *cmd, *n;
 283
 284         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 285                 if (cmd->device->sdev_target == my_cmd->device->sdev_target &&
 286                     cmd->device->lun == my_cmd->device->lun)
 287                         sas_eh_finish_cmd(cmd);
 288         }
 289 }
 290
 291 static void sas_scsi_clear_queue_I_T(struct list_head *error_q,
 292                                      struct domain_device *dev)
 293 {
 294         struct scsi_cmnd *cmd, *n;
 295
 296         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 297                 struct domain_device *x = cmd_to_domain_dev(cmd);
 298
 299                 if (x == dev)
 300                         sas_eh_finish_cmd(cmd);
 301         }
 302 }
 303
 304 static void sas_scsi_clear_queue_port(struct list_head *error_q,
 305                                       struct asd_sas_port *port)
 306 {
 307         struct scsi_cmnd *cmd, *n;
 308
 309         list_for_each_entry_safe(cmd, n, error_q, eh_entry) {
 310                 struct domain_device *dev = cmd_to_domain_dev(cmd);
 311                 struct asd_sas_port *x = dev->port;
 312
 313                 if (x == port)
 314                         sas_eh_finish_cmd(cmd);
 315         }
 316 }
 317
 318 enum task_disposition {
 319         TASK_IS_DONE,
 320         TASK_IS_ABORTED,
 321         TASK_IS_AT_LU,
 322         TASK_IS_NOT_AT_LU,
 323         TASK_ABORT_FAILED,
 324 };
 325
 326 static enum task_disposition sas_scsi_find_task(struct sas_task *task)
 327 {
 328         struct sas_ha_struct *ha = task->dev->port->ha;
 329         unsigned long flags;
 330         int i, res;
 331         struct sas_internal *si =
 332                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 333
 334         if (ha->lldd_max_execute_num > 1) {
 335                 struct scsi_core *core = &ha->core;
 336                 struct sas_task *t, *n;
 337
 338                 spin_lock_irqsave(&core->task_queue_lock, flags);
 339                 list_for_each_entry_safe(t, n, &core->task_queue, list) {
 340                         if (task == t) {
 341                                 list_del_init(&t->list);
 342                                 spin_unlock_irqrestore(&core->task_queue_lock,
 343                                                        flags);
 344                                 SAS_DPRINTK("%s: task 0x%p aborted from "
 345                                             "task_queue\n",
 346                                             __func__, task);
 347                                 return TASK_IS_ABORTED;
 348                         }
 349                 }
 350                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 351         }
 352
 353         for (i = 0; i < 5; i++) {
 354                 SAS_DPRINTK("%s: aborting task 0x%p\n", __func__, task);
 355                 res = si->dft->lldd_abort_task(task);
 356
 357                 spin_lock_irqsave(&task->task_state_lock, flags);
 358                 if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 359                         spin_unlock_irqrestore(&task->task_state_lock, flags);
 360                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 361                                     task);
 362                         return TASK_IS_DONE;
 363                 }
 364                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 365
 366                 if (res == TMF_RESP_FUNC_COMPLETE) {
 367                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 368                                     __func__, task);
 369                         return TASK_IS_ABORTED;
 370                 } else if (si->dft->lldd_query_task) {
 371                         SAS_DPRINTK("%s: querying task 0x%p\n",
 372                                     __func__, task);
 373                         res = si->dft->lldd_query_task(task);
 374                         switch (res) {
 375                         case TMF_RESP_FUNC_SUCC:
 376                                 SAS_DPRINTK("%s: task 0x%p at LU\n",
 377                                             __func__, task);
 378                                 return TASK_IS_AT_LU;
 379                         case TMF_RESP_FUNC_COMPLETE:
 380                                 SAS_DPRINTK("%s: task 0x%p not at LU\n",
 381                                             __func__, task);
 382                                 return TASK_IS_NOT_AT_LU;
 383                         case TMF_RESP_FUNC_FAILED:
 384                                 SAS_DPRINTK("%s: task 0x%p failed to abort\n",
 385                                                 __func__, task);
 386                                 return TASK_ABORT_FAILED;
 387                         }
 388
 389                 }
 390         }
 391         return res;
 392 }
 393
 394 static int sas_recover_lu(struct domain_device *dev, struct scsi_cmnd *cmd)
 395 {
 396         int res = TMF_RESP_FUNC_FAILED;
 397         struct scsi_lun lun;
 398         struct sas_internal *i =
 399                 to_sas_internal(dev->port->ha->core.shost->transportt);
 400
 401         int_to_scsilun(cmd->device->lun, &lun);
 402
 403         SAS_DPRINTK("eh: device %llx LUN %x has the task\n",
 404                     SAS_ADDR(dev->sas_addr),
 405                     cmd->device->lun);
 406
 407         if (i->dft->lldd_abort_task_set)
 408                 res = i->dft->lldd_abort_task_set(dev, lun.scsi_lun);
 409
 410         if (res == TMF_RESP_FUNC_FAILED) {
 411                 if (i->dft->lldd_clear_task_set)
 412                         res = i->dft->lldd_clear_task_set(dev, lun.scsi_lun);
 413         }
 414
 415         if (res == TMF_RESP_FUNC_FAILED) {
 416                 if (i->dft->lldd_lu_reset)
 417                         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 418         }
 419
 420         return res;
 421 }
 422
 423 static int sas_recover_I_T(struct domain_device *dev)
 424 {
 425         int res = TMF_RESP_FUNC_FAILED;
 426         struct sas_internal *i =
 427                 to_sas_internal(dev->port->ha->core.shost->transportt);
 428
 429         SAS_DPRINTK("I_T nexus reset for dev %016llx\n",
 430                     SAS_ADDR(dev->sas_addr));
 431
 432         if (i->dft->lldd_I_T_nexus_reset)
 433                 res = i->dft->lldd_I_T_nexus_reset(dev);
 434
 435         return res;
 436 }
 437
 438 /* Find the sas_phy that's attached to this device */
 439 struct sas_phy *sas_find_local_phy(struct domain_device *dev)
 440 {
 441         struct domain_device *pdev = dev->parent;
 442         struct ex_phy *exphy = NULL;
 443         int i;
 444
 445         /* Directly attached device */
 446         if (!pdev)
 447                 return dev->port->phy;
 448
 449         /* Otherwise look in the expander */
 450         for (i = 0; i < pdev->ex_dev.num_phys; i++)
 451                 if (!memcmp(dev->sas_addr,
 452                             pdev->ex_dev.ex_phy[i].attached_sas_addr,
 453                             SAS_ADDR_SIZE)) {
 454                         exphy = &pdev->ex_dev.ex_phy[i];
 455                         break;
 456                 }
 457
 458         BUG_ON(!exphy);
 459         return exphy->phy;
 460 }
 461 EXPORT_SYMBOL_GPL(sas_find_local_phy);
 462
 463 /* Attempt to send a LUN reset message to a device */
 464 int sas_eh_device_reset_handler(struct scsi_cmnd *cmd)
 465 {
 466         struct domain_device *dev = cmd_to_domain_dev(cmd);
 467         struct sas_internal *i =
 468                 to_sas_internal(dev->port->ha->core.shost->transportt);
 469         struct scsi_lun lun;
 470         int res;
 471
 472         int_to_scsilun(cmd->device->lun, &lun);
 473
 474         if (!i->dft->lldd_lu_reset)
 475                 return FAILED;
 476
 477         res = i->dft->lldd_lu_reset(dev, lun.scsi_lun);
 478         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 479                 return SUCCESS;
 480
 481         return FAILED;
 482 }
 483
 484 /* Attempt to send a phy (bus) reset */
 485 int sas_eh_bus_reset_handler(struct scsi_cmnd *cmd)
 486 {
 487         struct domain_device *dev = cmd_to_domain_dev(cmd);
 488         struct sas_phy *phy = sas_find_local_phy(dev);
 489         int res;
 490
 491         res = sas_phy_reset(phy, 1);
 492         if (res)
 493                 SAS_DPRINTK("Bus reset of %s failed 0x%x\n",
 494                             kobject_name(&phy->dev.kobj),
 495                             res);
 496         if (res == TMF_RESP_FUNC_SUCC || res == TMF_RESP_FUNC_COMPLETE)
 497                 return SUCCESS;
 498
 499         return FAILED;
 500 }
 501
 502 /* Try to reset a device */
 503 static int try_to_reset_cmd_device(struct scsi_cmnd *cmd)
 504 {
 505         int res;
 506         struct Scsi_Host *shost = cmd->device->host;
 507
 508         if (!shost->hostt->eh_device_reset_handler)
 509                 goto try_bus_reset;
 510
 511         res = shost->hostt->eh_device_reset_handler(cmd);
 512         if (res == SUCCESS)
 513                 return res;
 514
 515 try_bus_reset:
 516         if (shost->hostt->eh_bus_reset_handler)
 517                 return shost->hostt->eh_bus_reset_handler(cmd);
 518
 519         return FAILED;
 520 }
 521
 522 static int sas_eh_handle_sas_errors(struct Scsi_Host *shost,
 523                                     struct list_head *work_q,
 524                                     struct list_head *done_q)
 525 {
 526         struct scsi_cmnd *cmd, *n;
 527         enum task_disposition res = TASK_IS_DONE;
 528         int tmf_resp, need_reset;
 529         struct sas_internal *i = to_sas_internal(shost->transportt);
 530         unsigned long flags;
 531         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 532
 533 Again:
 534         list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 535                 struct sas_task *task = TO_SAS_TASK(cmd);
 536
 537                 if (!task)
 538                         continue;
 539
 540                 list_del_init(&cmd->eh_entry);
 541
 542                 spin_lock_irqsave(&task->task_state_lock, flags);
 543                 need_reset = task->task_state_flags & SAS_TASK_NEED_DEV_RESET;
 544                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 545
 546                 if (need_reset) {
 547                         SAS_DPRINTK("%s: task 0x%p requests reset\n",
 548                                     __func__, task);
 549                         goto reset;
 550                 }
 551
 552                 SAS_DPRINTK("trying to find task 0x%p\n", task);
 553                 res = sas_scsi_find_task(task);
 554
 555                 cmd->eh_eflags = 0;
 556
 557                 switch (res) {
 558                 case TASK_IS_DONE:
 559                         SAS_DPRINTK("%s: task 0x%p is done\n", __func__,
 560                                     task);
 561                         sas_eh_finish_cmd(cmd);
 562                         continue;
 563                 case TASK_IS_ABORTED:
 564                         SAS_DPRINTK("%s: task 0x%p is aborted\n",
 565                                     __func__, task);
 566                         sas_eh_finish_cmd(cmd);
 567                         continue;
 568                 case TASK_IS_AT_LU:
 569                         SAS_DPRINTK("task 0x%p is at LU: lu recover\n", task);
 570  reset:
 571                         tmf_resp = sas_recover_lu(task->dev, cmd);
 572                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 573                                 SAS_DPRINTK("dev %016llx LU %x is "
 574                                             "recovered\n",
 575                                             SAS_ADDR(task->dev),
 576                                             cmd->device->lun);
 577                                 sas_eh_finish_cmd(cmd);
 578                                 sas_scsi_clear_queue_lu(work_q, cmd);
 579                                 goto Again;
 580                         }
 581                         /* fallthrough */
 582                 case TASK_IS_NOT_AT_LU:
 583                 case TASK_ABORT_FAILED:
 584                         SAS_DPRINTK("task 0x%p is not at LU: I_T recover\n",
 585                                     task);
 586                         tmf_resp = sas_recover_I_T(task->dev);
 587                         if (tmf_resp == TMF_RESP_FUNC_COMPLETE) {
 588                                 struct domain_device *dev = task->dev;
 589                                 SAS_DPRINTK("I_T %016llx recovered\n",
 590                                             SAS_ADDR(task->dev->sas_addr));
 591                                 sas_eh_finish_cmd(cmd);
 592                                 sas_scsi_clear_queue_I_T(work_q, dev);
 593                                 goto Again;
 594                         }
 595                         /* Hammer time :-) */
 596                         try_to_reset_cmd_device(cmd);
 597                         if (i->dft->lldd_clear_nexus_port) {
 598                                 struct asd_sas_port *port = task->dev->port;
 599                                 SAS_DPRINTK("clearing nexus for port:%d\n",
 600                                             port->id);
 601                                 res = i->dft->lldd_clear_nexus_port(port);
 602                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 603                                         SAS_DPRINTK("clear nexus port:%d "
 604                                                     "succeeded\n", port->id);
 605                                         sas_eh_finish_cmd(cmd);
 606                                         sas_scsi_clear_queue_port(work_q,
 607                                                                   port);
 608                                         goto Again;
 609                                 }
 610                         }
 611                         if (i->dft->lldd_clear_nexus_ha) {
 612                                 SAS_DPRINTK("clear nexus ha\n");
 613                                 res = i->dft->lldd_clear_nexus_ha(ha);
 614                                 if (res == TMF_RESP_FUNC_COMPLETE) {
 615                                         SAS_DPRINTK("clear nexus ha "
 616                                                     "succeeded\n");
 617                                         sas_eh_finish_cmd(cmd);
 618                                         goto clear_q;
 619                                 }
 620                         }
 621                         /* If we are here -- this means that no amount
 622                          * of effort could recover from errors.  Quite
 623                          * possibly the HA just disappeared.
 624                          */
 625                         SAS_DPRINTK("error from  device %llx, LUN %x "
 626                                     "couldn't be recovered in any way\n",
 627                                     SAS_ADDR(task->dev->sas_addr),
 628                                     cmd->device->lun);
 629
 630                         sas_eh_finish_cmd(cmd);
 631                         goto clear_q;
 632                 }
 633         }
 634         return list_empty(work_q);
 635 clear_q:
 636         SAS_DPRINTK("--- Exit %s -- clear_q\n", __func__);
 637         list_for_each_entry_safe(cmd, n, work_q, eh_entry)
 638                 sas_eh_finish_cmd(cmd);
 639
 640         return list_empty(work_q);
 641 }
 642
 643 void sas_scsi_recover_host(struct Scsi_Host *shost)
 644 {
 645         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 646         unsigned long flags;
 647         LIST_HEAD(eh_work_q);
 648
 649         spin_lock_irqsave(shost->host_lock, flags);
 650         list_splice_init(&shost->eh_cmd_q, &eh_work_q);
 651         spin_unlock_irqrestore(shost->host_lock, flags);
 652
 653         SAS_DPRINTK("Enter %s\n", __func__);
 654         /*
 655          * Deal with commands that still have SAS tasks (i.e. they didn't
 656          * complete via the normal sas_task completion mechanism)
 657          */
 658         if (sas_eh_handle_sas_errors(shost, &eh_work_q, &ha->eh_done_q))
 659                 goto out;
 660
 661         /*
 662          * Now deal with SCSI commands that completed ok but have a an error
 663          * code (and hopefully sense data) attached.  This is roughly what
 664          * scsi_unjam_host does, but we skip scsi_eh_abort_cmds because any
 665          * command we see here has no sas_task and is thus unknown to the HA.
 666          */
 667         if (!scsi_eh_get_sense(&eh_work_q, &ha->eh_done_q))
 668                 scsi_eh_ready_devs(shost, &eh_work_q, &ha->eh_done_q);
 669
 670 out:
 671         scsi_eh_flush_done_q(&ha->eh_done_q);
 672         SAS_DPRINTK("--- Exit %s\n", __func__);
 673         return;
 674 }
 675
 676 enum blk_eh_timer_return sas_scsi_timed_out(struct scsi_cmnd *cmd)
 677 {
 678         struct sas_task *task = TO_SAS_TASK(cmd);
 679         unsigned long flags;
 680
 681         if (!task) {
 682                 cmd->request->timeout /= 2;
 683                 SAS_DPRINTK("command 0x%p, task 0x%p, gone: %s\n",
 684                             cmd, task, (cmd->request->timeout ?
 685                             "BLK_EH_RESET_TIMER" : "BLK_EH_NOT_HANDLED"));
 686                 if (!cmd->request->timeout)
 687                         return BLK_EH_NOT_HANDLED;
 688                 return BLK_EH_RESET_TIMER;
 689         }
 690
 691         spin_lock_irqsave(&task->task_state_lock, flags);
 692         BUG_ON(task->task_state_flags & SAS_TASK_STATE_ABORTED);
 693         if (task->task_state_flags & SAS_TASK_STATE_DONE) {
 694                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 695                 SAS_DPRINTK("command 0x%p, task 0x%p, timed out: "
 696                             "BLK_EH_HANDLED\n", cmd, task);
 697                 return BLK_EH_HANDLED;
 698         }
 699         if (!(task->task_state_flags & SAS_TASK_AT_INITIATOR)) {
 700                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 701                 SAS_DPRINTK("command 0x%p, task 0x%p, not at initiator: "
 702                             "BLK_EH_RESET_TIMER\n",
 703                             cmd, task);
 704                 return BLK_EH_RESET_TIMER;
 705         }
 706         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 707         spin_unlock_irqrestore(&task->task_state_lock, flags);
 708
 709         SAS_DPRINTK("command 0x%p, task 0x%p, timed out: BLK_EH_NOT_HANDLED\n",
 710                     cmd, task);
 711
 712         return BLK_EH_NOT_HANDLED;
 713 }
 714
 715 int sas_ioctl(struct scsi_device *sdev, int cmd, void __user *arg)
 716 {
 717         struct domain_device *dev = sdev_to_domain_dev(sdev);
 718
 719         if (dev_is_sata(dev))
 720                 return ata_sas_scsi_ioctl(dev->sata_dev.ap, sdev, cmd, arg);
 721
 722         return -EINVAL;
 723 }
 724
 725 struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy)
 726 {
 727         struct Scsi_Host *shost = dev_to_shost(rphy->dev.parent);
 728         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 729         struct domain_device *found_dev = NULL;
 730         int i;
 731         unsigned long flags;
 732
 733         spin_lock_irqsave(&ha->phy_port_lock, flags);
 734         for (i = 0; i < ha->num_phys; i++) {
 735                 struct asd_sas_port *port = ha->sas_port[i];
 736                 struct domain_device *dev;
 737
 738                 spin_lock(&port->dev_list_lock);
 739                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 740                         if (rphy == dev->rphy) {
 741                                 found_dev = dev;
 742                                 spin_unlock(&port->dev_list_lock);
 743                                 goto found;
 744                         }
 745                 }
 746                 spin_unlock(&port->dev_list_lock);
 747         }
 748  found:
 749         spin_unlock_irqrestore(&ha->phy_port_lock, flags);
 750
 751         return found_dev;
 752 }
 753
 754 static inline struct domain_device *sas_find_target(struct scsi_target *starget)
 755 {
 756         struct sas_rphy *rphy = dev_to_rphy(starget->dev.parent);
 757
 758         return sas_find_dev_by_rphy(rphy);
 759 }
 760
 761 int sas_target_alloc(struct scsi_target *starget)
 762 {
 763         struct domain_device *found_dev = sas_find_target(starget);
 764         int res;
 765
 766         if (!found_dev)
 767                 return -ENODEV;
 768
 769         if (dev_is_sata(found_dev)) {
 770                 res = sas_ata_init_host_and_port(found_dev, starget);
 771                 if (res)
 772                         return res;
 773         }
 774
 775         starget->hostdata = found_dev;
 776         return 0;
 777 }
 778
 779 #define SAS_DEF_QD 32
 780 #define SAS_MAX_QD 64
 781
 782 int sas_slave_configure(struct scsi_device *scsi_dev)
 783 {
 784         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 785         struct sas_ha_struct *sas_ha;
 786
 787         BUG_ON(dev->rphy->identify.device_type != SAS_END_DEVICE);
 788
 789         if (dev_is_sata(dev)) {
 790                 ata_sas_slave_configure(scsi_dev, dev->sata_dev.ap);
 791                 return 0;
 792         }
 793
 794         sas_ha = dev->port->ha;
 795
 796         sas_read_port_mode_page(scsi_dev);
 797
 798         if (scsi_dev->tagged_supported) {
 799                 scsi_set_tag_type(scsi_dev, MSG_SIMPLE_TAG);
 800                 scsi_activate_tcq(scsi_dev, SAS_DEF_QD);
 801         } else {
 802                 SAS_DPRINTK("device %llx, LUN %x doesn't support "
 803                             "TCQ\n", SAS_ADDR(dev->sas_addr),
 804                             scsi_dev->lun);
 805                 scsi_dev->tagged_supported = 0;
 806                 scsi_set_tag_type(scsi_dev, 0);
 807                 scsi_deactivate_tcq(scsi_dev, 1);
 808         }
 809
 810         scsi_dev->allow_restart = 1;
 811
 812         return 0;
 813 }
 814
 815 void sas_slave_destroy(struct scsi_device *scsi_dev)
 816 {
 817         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 818
 819         if (dev_is_sata(dev))
 820                 ata_port_disable(dev->sata_dev.ap);
 821 }
 822
 823 int sas_change_queue_depth(struct scsi_device *scsi_dev, int new_depth,
 824                            int reason)
 825 {
 826         int res = min(new_depth, SAS_MAX_QD);
 827
 828         if (reason != SCSI_QDEPTH_DEFAULT)
 829                 return -EOPNOTSUPP;
 830
 831         if (scsi_dev->tagged_supported)
 832                 scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev),
 833                                         res);
 834         else {
 835                 struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
 836                 sas_printk("device %llx LUN %x queue depth changed to 1\n",
 837                            SAS_ADDR(dev->sas_addr),
 838                            scsi_dev->lun);
 839                 scsi_adjust_queue_depth(scsi_dev, 0, 1);
 840                 res = 1;
 841         }
 842
 843         return res;
 844 }
 845
 846 int sas_change_queue_type(struct scsi_device *scsi_dev, int qt)
 847 {
 848         if (!scsi_dev->tagged_supported)
 849                 return 0;
 850
 851         scsi_deactivate_tcq(scsi_dev, 1);
 852
 853         scsi_set_tag_type(scsi_dev, qt);
 854         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
 855
 856         return qt;
 857 }
 858
 859 int sas_bios_param(struct scsi_device *scsi_dev,
 860                           struct block_device *bdev,
 861                           sector_t capacity, int *hsc)
 862 {
 863         hsc[0] = 255;
 864         hsc[1] = 63;
 865         sector_div(capacity, 255*63);
 866         hsc[2] = capacity;
 867
 868         return 0;
 869 }
 870
 871 /* ---------- Task Collector Thread implementation ---------- */
 872
 873 static void sas_queue(struct sas_ha_struct *sas_ha)
 874 {
 875         struct scsi_core *core = &sas_ha->core;
 876         unsigned long flags;
 877         LIST_HEAD(q);
 878         int can_queue;
 879         int res;
 880         struct sas_internal *i = to_sas_internal(core->shost->transportt);
 881
 882         spin_lock_irqsave(&core->task_queue_lock, flags);
 883         while (!kthread_should_stop() &&
 884                !list_empty(&core->task_queue)) {
 885
 886                 can_queue = sas_ha->lldd_queue_size - core->task_queue_size;
 887                 if (can_queue >= 0) {
 888                         can_queue = core->task_queue_size;
 889                         list_splice_init(&core->task_queue, &q);
 890                 } else {
 891                         struct list_head *a, *n;
 892
 893                         can_queue = sas_ha->lldd_queue_size;
 894                         list_for_each_safe(a, n, &core->task_queue) {
 895                                 list_move_tail(a, &q);
 896                                 if (--can_queue == 0)
 897                                         break;
 898                         }
 899                         can_queue = sas_ha->lldd_queue_size;
 900                 }
 901                 core->task_queue_size -= can_queue;
 902                 spin_unlock_irqrestore(&core->task_queue_lock, flags);
 903                 {
 904                         struct sas_task *task = list_entry(q.next,
 905                                                            struct sas_task,
 906                                                            list);
 907                         list_del_init(&q);
 908                         res = i->dft->lldd_execute_task(task, can_queue,
 909                                                         GFP_KERNEL);
 910                         if (unlikely(res))
 911                                 __list_add(&q, task->list.prev, &task->list);
 912                 }
 913                 spin_lock_irqsave(&core->task_queue_lock, flags);
 914                 if (res) {
 915                         list_splice_init(&q, &core->task_queue); /*at head*/
 916                         core->task_queue_size += can_queue;
 917                 }
 918         }
 919         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 920 }
 921
 922 /**
 923  * sas_queue_thread -- The Task Collector thread
 924  * @_sas_ha: pointer to struct sas_ha
 925  */
 926 static int sas_queue_thread(void *_sas_ha)
 927 {
 928         struct sas_ha_struct *sas_ha = _sas_ha;
 929
 930         while (1) {
 931                 set_current_state(TASK_INTERRUPTIBLE);
 932                 schedule();
 933                 sas_queue(sas_ha);
 934                 if (kthread_should_stop())
 935                         break;
 936         }
 937
 938         return 0;
 939 }
 940
 941 int sas_init_queue(struct sas_ha_struct *sas_ha)
 942 {
 943         struct scsi_core *core = &sas_ha->core;
 944
 945         spin_lock_init(&core->task_queue_lock);
 946         core->task_queue_size = 0;
 947         INIT_LIST_HEAD(&core->task_queue);
 948
 949         core->queue_thread = kthread_run(sas_queue_thread, sas_ha,
 950                                          "sas_queue_%d", core->shost->host_no);
 951         if (IS_ERR(core->queue_thread))
 952                 return PTR_ERR(core->queue_thread);
 953         return 0;
 954 }
 955
 956 void sas_shutdown_queue(struct sas_ha_struct *sas_ha)
 957 {
 958         unsigned long flags;
 959         struct scsi_core *core = &sas_ha->core;
 960         struct sas_task *task, *n;
 961
 962         kthread_stop(core->queue_thread);
 963
 964         if (!list_empty(&core->task_queue))
 965                 SAS_DPRINTK("HA: %llx: scsi core task queue is NOT empty!?\n",
 966                             SAS_ADDR(sas_ha->sas_addr));
 967
 968         spin_lock_irqsave(&core->task_queue_lock, flags);
 969         list_for_each_entry_safe(task, n, &core->task_queue, list) {
 970                 struct scsi_cmnd *cmd = task->uldd_task;
 971
 972                 list_del_init(&task->list);
 973
 974                 ASSIGN_SAS_TASK(cmd, NULL);
 975                 sas_free_task(task);
 976                 cmd->result = DID_ABORT << 16;
 977                 cmd->scsi_done(cmd);
 978         }
 979         spin_unlock_irqrestore(&core->task_queue_lock, flags);
 980 }
 981
 982 /*
 983  * Call the LLDD task abort routine directly.  This function is intended for
 984  * use by upper layers that need to tell the LLDD to abort a task.
 985  */
 986 int __sas_task_abort(struct sas_task *task)
 987 {
 988         struct sas_internal *si =
 989                 to_sas_internal(task->dev->port->ha->core.shost->transportt);
 990         unsigned long flags;
 991         int res;
 992
 993         spin_lock_irqsave(&task->task_state_lock, flags);
 994         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 995             task->task_state_flags & SAS_TASK_STATE_DONE) {
 996                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 997                 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
 998                             task);
 999                 return 0;
1000         }
1001         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
1002         spin_unlock_irqrestore(&task->task_state_lock, flags);
1003
1004         if (!si->dft->lldd_abort_task)
1005                 return -ENODEV;
1006
1007         res = si->dft->lldd_abort_task(task);
1008
1009         spin_lock_irqsave(&task->task_state_lock, flags);
1010         if ((task->task_state_flags & SAS_TASK_STATE_DONE) ||
1011             (res == TMF_RESP_FUNC_COMPLETE))
1012         {
1013                 spin_unlock_irqrestore(&task->task_state_lock, flags);
1014                 task->task_done(task);
1015                 return 0;
1016         }
1017
1018         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
1019                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
1020         spin_unlock_irqrestore(&task->task_state_lock, flags);
1021
1022         return -EAGAIN;
1023 }
1024
1025 /*
1026  * Tell an upper layer that it needs to initiate an abort for a given task.
1027  * This should only ever be called by an LLDD.
1028  */
1029 void sas_task_abort(struct sas_task *task)
1030 {
1031         struct scsi_cmnd *sc = task->uldd_task;
1032
1033         /* Escape for libsas internal commands */
1034         if (!sc) {
1035                 if (!del_timer(&task->timer))
1036                         return;
1037                 task->timer.function(task->timer.data);
1038                 return;
1039         }
1040
1041         if (dev_is_sata(task->dev)) {
1042                 sas_ata_task_abort(task);
1043                 return;
1044         }
1045
1046         blk_abort_request(sc->request);
1047         scsi_schedule_eh(sc->device->host);
1048 }
1049
1050 int sas_slave_alloc(struct scsi_device *scsi_dev)
1051 {
1052         struct domain_device *dev = sdev_to_domain_dev(scsi_dev);
1053
1054         if (dev_is_sata(dev))
1055                 return ata_sas_port_init(dev->sata_dev.ap);
1056
1057         return 0;
1058 }
1059
1060 void sas_target_destroy(struct scsi_target *starget)
1061 {
1062         struct domain_device *found_dev = sas_find_target(starget);
1063
1064         if (!found_dev)
1065                 return;
1066
1067         if (dev_is_sata(found_dev))
1068                 ata_sas_port_destroy(found_dev->sata_dev.ap);
1069
1070         return;
1071 }
1072
1073 static void sas_parse_addr(u8 *sas_addr, const char *p)
1074 {
1075         int i;
1076         for (i = 0; i < SAS_ADDR_SIZE; i++) {
1077                 u8 h, l;
1078                 if (!*p)
1079                         break;
1080                 h = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1081                 p++;
1082                 l = isdigit(*p) ? *p-'0' : toupper(*p)-'A'+10;
1083                 p++;
1084                 sas_addr[i] = (h<<4) | l;
1085         }
1086 }
1087
1088 #define SAS_STRING_ADDR_SIZE    16
1089
1090 int sas_request_addr(struct Scsi_Host *shost, u8 *addr)
1091 {
1092         int res;
1093         const struct firmware *fw;
1094
1095         res = request_firmware(&fw, "sas_addr", &shost->shost_gendev);
1096         if (res)
1097                 return res;
1098
1099         if (fw->size < SAS_STRING_ADDR_SIZE) {
1100                 res = -ENODEV;
1101                 goto out;
1102         }
1103
1104         sas_parse_addr(addr, fw->data);
1105
1106 out:
1107         release_firmware(fw);
1108         return res;
1109 }
1110 EXPORT_SYMBOL_GPL(sas_request_addr);
1111
1112 EXPORT_SYMBOL_GPL(sas_queuecommand);
1113 EXPORT_SYMBOL_GPL(sas_target_alloc);
1114 EXPORT_SYMBOL_GPL(sas_slave_configure);
1115 EXPORT_SYMBOL_GPL(sas_slave_destroy);
1116 EXPORT_SYMBOL_GPL(sas_change_queue_depth);
1117 EXPORT_SYMBOL_GPL(sas_change_queue_type);
1118 EXPORT_SYMBOL_GPL(sas_bios_param);
1119 EXPORT_SYMBOL_GPL(__sas_task_abort);
1120 EXPORT_SYMBOL_GPL(sas_task_abort);
1121 EXPORT_SYMBOL_GPL(sas_phy_reset);
1122 EXPORT_SYMBOL_GPL(sas_phy_enable);
1123 EXPORT_SYMBOL_GPL(sas_eh_device_reset_handler);
1124 EXPORT_SYMBOL_GPL(sas_eh_bus_reset_handler);
1125 EXPORT_SYMBOL_GPL(sas_slave_alloc);
1126 EXPORT_SYMBOL_GPL(sas_target_destroy);
1127 EXPORT_SYMBOL_GPL(sas_ioctl);