drivers/scsi/libsas/sas_ata.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Support for SATA devices on Serial Attached SCSI (SAS) controllers
   4  *
   5  * Copyright (C) 2006 IBM Corporation
   6  *
   7  * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
   8  */
   9
  10 #include <linux/scatterlist.h>
  11 #include <linux/slab.h>
  12 #include <linux/async.h>
  13 #include <linux/export.h>
  14
  15 #include <scsi/sas_ata.h>
  16 #include "sas_internal.h"
  17 #include <scsi/scsi_host.h>
  18 #include <scsi/scsi_device.h>
  19 #include <scsi/scsi_tcq.h>
  20 #include <scsi/scsi.h>
  21 #include <scsi/scsi_transport.h>
  22 #include <scsi/scsi_transport_sas.h>
  23 #include "../scsi_sas_internal.h"
  24 #include "../scsi_transport_api.h"
  25 #include <scsi/scsi_eh.h>
  26
  27 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
  28 {
  29         /* Cheesy attempt to translate SAS errors into ATA.  Hah! */
  30
  31         /* transport error */
  32         if (ts->resp == SAS_TASK_UNDELIVERED)
  33                 return AC_ERR_ATA_BUS;
  34
  35         /* ts->resp == SAS_TASK_COMPLETE */
  36         /* task delivered, what happened afterwards? */
  37         switch (ts->stat) {
  38                 case SAS_DEV_NO_RESPONSE:
  39                         return AC_ERR_TIMEOUT;
  40
  41                 case SAS_INTERRUPTED:
  42                 case SAS_PHY_DOWN:
  43                 case SAS_NAK_R_ERR:
  44                         return AC_ERR_ATA_BUS;
  45
  46
  47                 case SAS_DATA_UNDERRUN:
  48                         /*
  49                          * Some programs that use the taskfile interface
  50                          * (smartctl in particular) can cause underrun
  51                          * problems.  Ignore these errors, perhaps at our
  52                          * peril.
  53                          */
  54                         return 0;
  55
  56                 case SAS_DATA_OVERRUN:
  57                 case SAS_QUEUE_FULL:
  58                 case SAS_DEVICE_UNKNOWN:
  59                 case SAS_SG_ERR:
  60                         return AC_ERR_INVALID;
  61
  62                 case SAS_OPEN_TO:
  63                 case SAS_OPEN_REJECT:
  64                         pr_warn("%s: Saw error %d.  What to do?\n",
  65                                 __func__, ts->stat);
  66                         return AC_ERR_OTHER;
  67
  68                 case SAM_STAT_CHECK_CONDITION:
  69                 case SAS_ABORTED_TASK:
  70                         return AC_ERR_DEV;
  71
  72                 case SAS_PROTO_RESPONSE:
  73                         /* This means the ending_fis has the error
  74                          * value; return 0 here to collect it */
  75                         return 0;
  76                 default:
  77                         return 0;
  78         }
  79 }
  80
  81 static void sas_ata_task_done(struct sas_task *task)
  82 {
  83         struct ata_queued_cmd *qc = task->uldd_task;
  84         struct domain_device *dev = task->dev;
  85         struct task_status_struct *stat = &task->task_status;
  86         struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
  87         struct sas_ha_struct *sas_ha = dev->port->ha;
  88         enum ata_completion_errors ac;
  89         unsigned long flags;
  90         struct ata_link *link;
  91         struct ata_port *ap;
  92
  93         spin_lock_irqsave(&dev->done_lock, flags);
  94         if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
  95                 task = NULL;
  96         else if (qc && qc->scsicmd)
  97                 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
  98         spin_unlock_irqrestore(&dev->done_lock, flags);
  99
 100         /* check if libsas-eh got to the task before us */
 101         if (unlikely(!task))
 102                 return;
 103
 104         if (!qc)
 105                 goto qc_already_gone;
 106
 107         ap = qc->ap;
 108         link = &ap->link;
 109
 110         spin_lock_irqsave(ap->lock, flags);
 111         /* check if we lost the race with libata/sas_ata_post_internal() */
 112         if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) {
 113                 spin_unlock_irqrestore(ap->lock, flags);
 114                 if (qc->scsicmd)
 115                         goto qc_already_gone;
 116                 else {
 117                         /* if eh is not involved and the port is frozen then the
 118                          * ata internal abort process has taken responsibility
 119                          * for this sas_task
 120                          */
 121                         return;
 122                 }
 123         }
 124
 125         if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
 126             ((stat->stat == SAM_STAT_CHECK_CONDITION &&
 127               dev->sata_dev.class == ATA_DEV_ATAPI))) {
 128                 memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE);
 129
 130                 if (!link->sactive) {
 131                         qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
 132                 } else {
 133                         link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
 134                         if (unlikely(link->eh_info.err_mask))
 135                                 qc->flags |= ATA_QCFLAG_FAILED;
 136                 }
 137         } else {
 138                 ac = sas_to_ata_err(stat);
 139                 if (ac) {
 140                         pr_warn("%s: SAS error 0x%x\n", __func__, stat->stat);
 141                         /* We saw a SAS error. Send a vague error. */
 142                         if (!link->sactive) {
 143                                 qc->err_mask = ac;
 144                         } else {
 145                                 link->eh_info.err_mask |= AC_ERR_DEV;
 146                                 qc->flags |= ATA_QCFLAG_FAILED;
 147                         }
 148
 149                         dev->sata_dev.fis[3] = 0x04; /* status err */
 150                         dev->sata_dev.fis[2] = ATA_ERR;
 151                 }
 152         }
 153
 154         qc->lldd_task = NULL;
 155         ata_qc_complete(qc);
 156         spin_unlock_irqrestore(ap->lock, flags);
 157
 158 qc_already_gone:
 159         sas_free_task(task);
 160 }
 161
 162 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 163 {
 164         struct sas_task *task;
 165         struct scatterlist *sg;
 166         int ret = AC_ERR_SYSTEM;
 167         unsigned int si, xfer = 0;
 168         struct ata_port *ap = qc->ap;
 169         struct domain_device *dev = ap->private_data;
 170         struct sas_ha_struct *sas_ha = dev->port->ha;
 171         struct Scsi_Host *host = sas_ha->core.shost;
 172         struct sas_internal *i = to_sas_internal(host->transportt);
 173
 174         /* TODO: we should try to remove that unlock */
 175         spin_unlock(ap->lock);
 176
 177         /* If the device fell off, no sense in issuing commands */
 178         if (test_bit(SAS_DEV_GONE, &dev->state))
 179                 goto out;
 180
 181         task = sas_alloc_task(GFP_ATOMIC);
 182         if (!task)
 183                 goto out;
 184         task->dev = dev;
 185         task->task_proto = SAS_PROTOCOL_STP;
 186         task->task_done = sas_ata_task_done;
 187
 188         if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
 189             qc->tf.command == ATA_CMD_FPDMA_READ ||
 190             qc->tf.command == ATA_CMD_FPDMA_RECV ||
 191             qc->tf.command == ATA_CMD_FPDMA_SEND ||
 192             qc->tf.command == ATA_CMD_NCQ_NON_DATA) {
 193                 /* Need to zero out the tag libata assigned us */
 194                 qc->tf.nsect = 0;
 195         }
 196
 197         ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
 198         task->uldd_task = qc;
 199         if (ata_is_atapi(qc->tf.protocol)) {
 200                 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
 201                 task->total_xfer_len = qc->nbytes;
 202                 task->num_scatter = qc->n_elem;
 203         } else {
 204                 for_each_sg(qc->sg, sg, qc->n_elem, si)
 205                         xfer += sg_dma_len(sg);
 206
 207                 task->total_xfer_len = xfer;
 208                 task->num_scatter = si;
 209         }
 210
 211         task->data_dir = qc->dma_dir;
 212         task->scatter = qc->sg;
 213         task->ata_task.retry_count = 1;
 214         task->task_state_flags = SAS_TASK_STATE_PENDING;
 215         qc->lldd_task = task;
 216
 217         task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol);
 218         task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol);
 219
 220         if (qc->scsicmd)
 221                 ASSIGN_SAS_TASK(qc->scsicmd, task);
 222
 223         ret = i->dft->lldd_execute_task(task, GFP_ATOMIC);
 224         if (ret) {
 225                 pr_debug("lldd_execute_task returned: %d\n", ret);
 226
 227                 if (qc->scsicmd)
 228                         ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 229                 sas_free_task(task);
 230                 qc->lldd_task = NULL;
 231                 ret = AC_ERR_SYSTEM;
 232         }
 233
 234  out:
 235         spin_lock(ap->lock);
 236         return ret;
 237 }
 238
 239 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
 240 {
 241         struct domain_device *dev = qc->ap->private_data;
 242
 243         ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
 244         return true;
 245 }
 246
 247 static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
 248 {
 249         return to_sas_internal(dev->port->ha->core.shost->transportt);
 250 }
 251
 252 static int sas_get_ata_command_set(struct domain_device *dev);
 253
 254 int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
 255 {
 256         if (phy->attached_tproto & SAS_PROTOCOL_STP)
 257                 dev->tproto = phy->attached_tproto;
 258         if (phy->attached_sata_dev)
 259                 dev->tproto |= SAS_SATA_DEV;
 260
 261         if (phy->attached_dev_type == SAS_SATA_PENDING)
 262                 dev->dev_type = SAS_SATA_PENDING;
 263         else {
 264                 int res;
 265
 266                 dev->dev_type = SAS_SATA_DEV;
 267                 res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
 268                                               &dev->sata_dev.rps_resp);
 269                 if (res) {
 270                         pr_debug("report phy sata to %016llx:%02d returned 0x%x\n",
 271                                  SAS_ADDR(dev->parent->sas_addr),
 272                                  phy->phy_id, res);
 273                         return res;
 274                 }
 275                 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
 276                        sizeof(struct dev_to_host_fis));
 277                 dev->sata_dev.class = sas_get_ata_command_set(dev);
 278         }
 279         return 0;
 280 }
 281
 282 static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
 283 {
 284         int res;
 285
 286         /* we weren't pending, so successfully end the reset sequence now */
 287         if (dev->dev_type != SAS_SATA_PENDING)
 288                 return 1;
 289
 290         /* hmmm, if this succeeds do we need to repost the domain_device to the
 291          * lldd so it can pick up new parameters?
 292          */
 293         res = sas_get_ata_info(dev, phy);
 294         if (res)
 295                 return 0; /* retry */
 296         else
 297                 return 1;
 298 }
 299
 300 static int smp_ata_check_ready(struct ata_link *link)
 301 {
 302         int res;
 303         struct ata_port *ap = link->ap;
 304         struct domain_device *dev = ap->private_data;
 305         struct domain_device *ex_dev = dev->parent;
 306         struct sas_phy *phy = sas_get_local_phy(dev);
 307         struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
 308
 309         res = sas_ex_phy_discover(ex_dev, phy->number);
 310         sas_put_local_phy(phy);
 311
 312         /* break the wait early if the expander is unreachable,
 313          * otherwise keep polling
 314          */
 315         if (res == -ECOMM)
 316                 return res;
 317         if (res != SMP_RESP_FUNC_ACC)
 318                 return 0;
 319
 320         switch (ex_phy->attached_dev_type) {
 321         case SAS_SATA_PENDING:
 322                 return 0;
 323         case SAS_END_DEVICE:
 324                 if (ex_phy->attached_sata_dev)
 325                         return sas_ata_clear_pending(dev, ex_phy);
 326                 /* fall through */
 327         default:
 328                 return -ENODEV;
 329         }
 330 }
 331
 332 static int local_ata_check_ready(struct ata_link *link)
 333 {
 334         struct ata_port *ap = link->ap;
 335         struct domain_device *dev = ap->private_data;
 336         struct sas_internal *i = dev_to_sas_internal(dev);
 337
 338         if (i->dft->lldd_ata_check_ready)
 339                 return i->dft->lldd_ata_check_ready(dev);
 340         else {
 341                 /* lldd's that don't implement 'ready' checking get the
 342                  * old default behavior of not coordinating reset
 343                  * recovery with libata
 344                  */
 345                 return 1;
 346         }
 347 }
 348
 349 static int sas_ata_printk(const char *level, const struct domain_device *ddev,
 350                           const char *fmt, ...)
 351 {
 352         struct ata_port *ap = ddev->sata_dev.ap;
 353         struct device *dev = &ddev->rphy->dev;
 354         struct va_format vaf;
 355         va_list args;
 356         int r;
 357
 358         va_start(args, fmt);
 359
 360         vaf.fmt = fmt;
 361         vaf.va = &args;
 362
 363         r = printk("%s" SAS_FMT "ata%u: %s: %pV",
 364                    level, ap->print_id, dev_name(dev), &vaf);
 365
 366         va_end(args);
 367
 368         return r;
 369 }
 370
 371 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
 372                               unsigned long deadline)
 373 {
 374         int ret = 0, res;
 375         struct sas_phy *phy;
 376         struct ata_port *ap = link->ap;
 377         int (*check_ready)(struct ata_link *link);
 378         struct domain_device *dev = ap->private_data;
 379         struct sas_internal *i = dev_to_sas_internal(dev);
 380
 381         res = i->dft->lldd_I_T_nexus_reset(dev);
 382         if (res == -ENODEV)
 383                 return res;
 384
 385         if (res != TMF_RESP_FUNC_COMPLETE)
 386                 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
 387
 388         phy = sas_get_local_phy(dev);
 389         if (scsi_is_sas_phy_local(phy))
 390                 check_ready = local_ata_check_ready;
 391         else
 392                 check_ready = smp_ata_check_ready;
 393         sas_put_local_phy(phy);
 394
 395         ret = ata_wait_after_reset(link, deadline, check_ready);
 396         if (ret && ret != -EAGAIN)
 397                 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
 398
 399         *class = dev->sata_dev.class;
 400
 401         ap->cbl = ATA_CBL_SATA;
 402         return ret;
 403 }
 404
 405 /*
 406  * notify the lldd to forget the sas_task for this internal ata command
 407  * that bypasses scsi-eh
 408  */
 409 static void sas_ata_internal_abort(struct sas_task *task)
 410 {
 411         struct sas_internal *si = dev_to_sas_internal(task->dev);
 412         unsigned long flags;
 413         int res;
 414
 415         spin_lock_irqsave(&task->task_state_lock, flags);
 416         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 417             task->task_state_flags & SAS_TASK_STATE_DONE) {
 418                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 419                 pr_debug("%s: Task %p already finished.\n", __func__, task);
 420                 goto out;
 421         }
 422         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 423         spin_unlock_irqrestore(&task->task_state_lock, flags);
 424
 425         res = si->dft->lldd_abort_task(task);
 426
 427         spin_lock_irqsave(&task->task_state_lock, flags);
 428         if (task->task_state_flags & SAS_TASK_STATE_DONE ||
 429             res == TMF_RESP_FUNC_COMPLETE) {
 430                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 431                 goto out;
 432         }
 433
 434         /* XXX we are not prepared to deal with ->lldd_abort_task()
 435          * failures.  TODO: lldds need to unconditionally forget about
 436          * aborted ata tasks, otherwise we (likely) leak the sas task
 437          * here
 438          */
 439         pr_warn("%s: Task %p leaked.\n", __func__, task);
 440
 441         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 442                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 443         spin_unlock_irqrestore(&task->task_state_lock, flags);
 444
 445         return;
 446  out:
 447         sas_free_task(task);
 448 }
 449
 450 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 451 {
 452         if (qc->flags & ATA_QCFLAG_FAILED)
 453                 qc->err_mask |= AC_ERR_OTHER;
 454
 455         if (qc->err_mask) {
 456                 /*
 457                  * Find the sas_task and kill it.  By this point, libata
 458                  * has decided to kill the qc and has frozen the port.
 459                  * In this state sas_ata_task_done() will no longer free
 460                  * the sas_task, so we need to notify the lldd (via
 461                  * ->lldd_abort_task) that the task is dead and free it
 462                  *  ourselves.
 463                  */
 464                 struct sas_task *task = qc->lldd_task;
 465
 466                 qc->lldd_task = NULL;
 467                 if (!task)
 468                         return;
 469                 task->uldd_task = NULL;
 470                 sas_ata_internal_abort(task);
 471         }
 472 }
 473
 474
 475 static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
 476 {
 477         struct domain_device *dev = ap->private_data;
 478         struct sas_internal *i = dev_to_sas_internal(dev);
 479
 480         if (i->dft->lldd_ata_set_dmamode)
 481                 i->dft->lldd_ata_set_dmamode(dev);
 482 }
 483
 484 static void sas_ata_sched_eh(struct ata_port *ap)
 485 {
 486         struct domain_device *dev = ap->private_data;
 487         struct sas_ha_struct *ha = dev->port->ha;
 488         unsigned long flags;
 489
 490         spin_lock_irqsave(&ha->lock, flags);
 491         if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state))
 492                 ha->eh_active++;
 493         ata_std_sched_eh(ap);
 494         spin_unlock_irqrestore(&ha->lock, flags);
 495 }
 496
 497 void sas_ata_end_eh(struct ata_port *ap)
 498 {
 499         struct domain_device *dev = ap->private_data;
 500         struct sas_ha_struct *ha = dev->port->ha;
 501         unsigned long flags;
 502
 503         spin_lock_irqsave(&ha->lock, flags);
 504         if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state))
 505                 ha->eh_active--;
 506         spin_unlock_irqrestore(&ha->lock, flags);
 507 }
 508
 509 static struct ata_port_operations sas_sata_ops = {
 510         .prereset               = ata_std_prereset,
 511         .hardreset              = sas_ata_hard_reset,
 512         .postreset              = ata_std_postreset,
 513         .error_handler          = ata_std_error_handler,
 514         .post_internal_cmd      = sas_ata_post_internal,
 515         .qc_defer               = ata_std_qc_defer,
 516         .qc_prep                = ata_noop_qc_prep,
 517         .qc_issue               = sas_ata_qc_issue,
 518         .qc_fill_rtf            = sas_ata_qc_fill_rtf,
 519         .port_start             = ata_sas_port_start,
 520         .port_stop              = ata_sas_port_stop,
 521         .set_dmamode            = sas_ata_set_dmamode,
 522         .sched_eh               = sas_ata_sched_eh,
 523         .end_eh                 = sas_ata_end_eh,
 524 };
 525
 526 static struct ata_port_info sata_port_info = {
 527         .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
 528                  ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX,
 529         .pio_mask = ATA_PIO4,
 530         .mwdma_mask = ATA_MWDMA2,
 531         .udma_mask = ATA_UDMA6,
 532         .port_ops = &sas_sata_ops
 533 };
 534
 535 int sas_ata_init(struct domain_device *found_dev)
 536 {
 537         struct sas_ha_struct *ha = found_dev->port->ha;
 538         struct Scsi_Host *shost = ha->core.shost;
 539         struct ata_host *ata_host;
 540         struct ata_port *ap;
 541         int rc;
 542
 543         ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL);
 544         if (!ata_host)  {
 545                 pr_err("ata host alloc failed.\n");
 546                 return -ENOMEM;
 547         }
 548
 549         ata_host_init(ata_host, ha->dev, &sas_sata_ops);
 550
 551         ap = ata_sas_port_alloc(ata_host, &sata_port_info, shost);
 552         if (!ap) {
 553                 pr_err("ata_sas_port_alloc failed.\n");
 554                 rc = -ENODEV;
 555                 goto free_host;
 556         }
 557
 558         ap->private_data = found_dev;
 559         ap->cbl = ATA_CBL_SATA;
 560         ap->scsi_host = shost;
 561         rc = ata_sas_port_init(ap);
 562         if (rc)
 563                 goto destroy_port;
 564
 565         rc = ata_sas_tport_add(ata_host->dev, ap);
 566         if (rc)
 567                 goto destroy_port;
 568
 569         found_dev->sata_dev.ata_host = ata_host;
 570         found_dev->sata_dev.ap = ap;
 571
 572         return 0;
 573
 574 destroy_port:
 575         ata_sas_port_destroy(ap);
 576 free_host:
 577         ata_host_put(ata_host);
 578         return rc;
 579 }
 580
 581 void sas_ata_task_abort(struct sas_task *task)
 582 {
 583         struct ata_queued_cmd *qc = task->uldd_task;
 584         struct completion *waiting;
 585
 586         /* Bounce SCSI-initiated commands to the SCSI EH */
 587         if (qc->scsicmd) {
 588                 blk_abort_request(qc->scsicmd->request);
 589                 return;
 590         }
 591
 592         /* Internal command, fake a timeout and complete. */
 593         qc->flags &= ~ATA_QCFLAG_ACTIVE;
 594         qc->flags |= ATA_QCFLAG_FAILED;
 595         qc->err_mask |= AC_ERR_TIMEOUT;
 596         waiting = qc->private_data;
 597         complete(waiting);
 598 }
 599
 600 static int sas_get_ata_command_set(struct domain_device *dev)
 601 {
 602         struct dev_to_host_fis *fis =
 603                 (struct dev_to_host_fis *) dev->frame_rcvd;
 604         struct ata_taskfile tf;
 605
 606         if (dev->dev_type == SAS_SATA_PENDING)
 607                 return ATA_DEV_UNKNOWN;
 608
 609         ata_tf_from_fis((const u8 *)fis, &tf);
 610
 611         return ata_dev_classify(&tf);
 612 }
 613
 614 void sas_probe_sata(struct asd_sas_port *port)
 615 {
 616         struct domain_device *dev, *n;
 617
 618         mutex_lock(&port->ha->disco_mutex);
 619         list_for_each_entry(dev, &port->disco_list, disco_list_node) {
 620                 if (!dev_is_sata(dev))
 621                         continue;
 622
 623                 ata_sas_async_probe(dev->sata_dev.ap);
 624         }
 625         mutex_unlock(&port->ha->disco_mutex);
 626
 627         list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
 628                 if (!dev_is_sata(dev))
 629                         continue;
 630
 631                 sas_ata_wait_eh(dev);
 632
 633                 /* if libata could not bring the link up, don't surface
 634                  * the device
 635                  */
 636                 if (!ata_dev_enabled(sas_to_ata_dev(dev)))
 637                         sas_fail_probe(dev, __func__, -ENODEV);
 638         }
 639
 640 }
 641
 642 static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
 643 {
 644         struct domain_device *dev, *n;
 645
 646         list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
 647                 if (!dev_is_sata(dev))
 648                         continue;
 649
 650                 sas_ata_wait_eh(dev);
 651
 652                 /* if libata failed to power manage the device, tear it down */
 653                 if (ata_dev_disabled(sas_to_ata_dev(dev)))
 654                         sas_fail_probe(dev, func, -ENODEV);
 655         }
 656 }
 657
 658 void sas_suspend_sata(struct asd_sas_port *port)
 659 {
 660         struct domain_device *dev;
 661
 662         mutex_lock(&port->ha->disco_mutex);
 663         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 664                 struct sata_device *sata;
 665
 666                 if (!dev_is_sata(dev))
 667                         continue;
 668
 669                 sata = &dev->sata_dev;
 670                 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND)
 671                         continue;
 672
 673                 ata_sas_port_suspend(sata->ap);
 674         }
 675         mutex_unlock(&port->ha->disco_mutex);
 676
 677         sas_ata_flush_pm_eh(port, __func__);
 678 }
 679
 680 void sas_resume_sata(struct asd_sas_port *port)
 681 {
 682         struct domain_device *dev;
 683
 684         mutex_lock(&port->ha->disco_mutex);
 685         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 686                 struct sata_device *sata;
 687
 688                 if (!dev_is_sata(dev))
 689                         continue;
 690
 691                 sata = &dev->sata_dev;
 692                 if (sata->ap->pm_mesg.event == PM_EVENT_ON)
 693                         continue;
 694
 695                 ata_sas_port_resume(sata->ap);
 696         }
 697         mutex_unlock(&port->ha->disco_mutex);
 698
 699         sas_ata_flush_pm_eh(port, __func__);
 700 }
 701
 702 /**
 703  * sas_discover_sata - discover an STP/SATA domain device
 704  * @dev: pointer to struct domain_device of interest
 705  *
 706  * Devices directly attached to a HA port, have no parents.  All other
 707  * devices do, and should have their "parent" pointer set appropriately
 708  * before calling this function.
 709  */
 710 int sas_discover_sata(struct domain_device *dev)
 711 {
 712         int res;
 713
 714         if (dev->dev_type == SAS_SATA_PM)
 715                 return -ENODEV;
 716
 717         dev->sata_dev.class = sas_get_ata_command_set(dev);
 718         sas_fill_in_rphy(dev, dev->rphy);
 719
 720         res = sas_notify_lldd_dev_found(dev);
 721         if (res)
 722                 return res;
 723
 724         return 0;
 725 }
 726
 727 static void async_sas_ata_eh(void *data, async_cookie_t cookie)
 728 {
 729         struct domain_device *dev = data;
 730         struct ata_port *ap = dev->sata_dev.ap;
 731         struct sas_ha_struct *ha = dev->port->ha;
 732
 733         sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
 734         ata_scsi_port_error_handler(ha->core.shost, ap);
 735         sas_put_device(dev);
 736 }
 737
 738 void sas_ata_strategy_handler(struct Scsi_Host *shost)
 739 {
 740         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 741         ASYNC_DOMAIN_EXCLUSIVE(async);
 742         int i;
 743
 744         /* it's ok to defer revalidation events during ata eh, these
 745          * disks are in one of three states:
 746          * 1/ present for initial domain discovery, and these
 747          *    resets will cause bcn flutters
 748          * 2/ hot removed, we'll discover that after eh fails
 749          * 3/ hot added after initial discovery, lost the race, and need
 750          *    to catch the next train.
 751          */
 752         sas_disable_revalidation(sas_ha);
 753
 754         spin_lock_irq(&sas_ha->phy_port_lock);
 755         for (i = 0; i < sas_ha->num_phys; i++) {
 756                 struct asd_sas_port *port = sas_ha->sas_port[i];
 757                 struct domain_device *dev;
 758
 759                 spin_lock(&port->dev_list_lock);
 760                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 761                         if (!dev_is_sata(dev))
 762                                 continue;
 763
 764                         /* hold a reference over eh since we may be
 765                          * racing with final remove once all commands
 766                          * are completed
 767                          */
 768                         kref_get(&dev->kref);
 769
 770                         async_schedule_domain(async_sas_ata_eh, dev, &async);
 771                 }
 772                 spin_unlock(&port->dev_list_lock);
 773         }
 774         spin_unlock_irq(&sas_ha->phy_port_lock);
 775
 776         async_synchronize_full_domain(&async);
 777
 778         sas_enable_revalidation(sas_ha);
 779 }
 780
 781 void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 782                 struct list_head *done_q)
 783 {
 784         struct scsi_cmnd *cmd, *n;
 785         struct domain_device *eh_dev;
 786
 787         do {
 788                 LIST_HEAD(sata_q);
 789                 eh_dev = NULL;
 790
 791                 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 792                         struct domain_device *ddev = cmd_to_domain_dev(cmd);
 793
 794                         if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
 795                                 continue;
 796                         if (eh_dev && eh_dev != ddev)
 797                                 continue;
 798                         eh_dev = ddev;
 799                         list_move(&cmd->eh_entry, &sata_q);
 800                 }
 801
 802                 if (!list_empty(&sata_q)) {
 803                         struct ata_port *ap = eh_dev->sata_dev.ap;
 804
 805                         sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
 806                         ata_scsi_cmd_error_handler(shost, ap, &sata_q);
 807                         /*
 808                          * ata's error handler may leave the cmd on the list
 809                          * so make sure they don't remain on a stack list
 810                          * about to go out of scope.
 811                          *
 812                          * This looks strange, since the commands are
 813                          * now part of no list, but the next error
 814                          * action will be ata_port_error_handler()
 815                          * which takes no list and sweeps them up
 816                          * anyway from the ata tag array.
 817                          */
 818                         while (!list_empty(&sata_q))
 819                                 list_del_init(sata_q.next);
 820                 }
 821         } while (eh_dev);
 822 }
 823
 824 void sas_ata_schedule_reset(struct domain_device *dev)
 825 {
 826         struct ata_eh_info *ehi;
 827         struct ata_port *ap;
 828         unsigned long flags;
 829
 830         if (!dev_is_sata(dev))
 831                 return;
 832
 833         ap = dev->sata_dev.ap;
 834         ehi = &ap->link.eh_info;
 835
 836         spin_lock_irqsave(ap->lock, flags);
 837         ehi->err_mask |= AC_ERR_TIMEOUT;
 838         ehi->action |= ATA_EH_RESET;
 839         ata_port_schedule_eh(ap);
 840         spin_unlock_irqrestore(ap->lock, flags);
 841 }
 842 EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
 843
 844 void sas_ata_wait_eh(struct domain_device *dev)
 845 {
 846         struct ata_port *ap;
 847
 848         if (!dev_is_sata(dev))
 849                 return;
 850
 851         ap = dev->sata_dev.ap;
 852         ata_port_wait_eh(ap);
 853 }