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         __must_hold(ap->lock)
 164 {
 165         struct sas_task *task;
 166         struct scatterlist *sg;
 167         int ret = AC_ERR_SYSTEM;
 168         unsigned int si, xfer = 0;
 169         struct ata_port *ap = qc->ap;
 170         struct domain_device *dev = ap->private_data;
 171         struct sas_ha_struct *sas_ha = dev->port->ha;
 172         struct Scsi_Host *host = sas_ha->core.shost;
 173         struct sas_internal *i = to_sas_internal(host->transportt);
 174
 175         /* TODO: we should try to remove that unlock */
 176         spin_unlock(ap->lock);
 177
 178         /* If the device fell off, no sense in issuing commands */
 179         if (test_bit(SAS_DEV_GONE, &dev->state))
 180                 goto out;
 181
 182         task = sas_alloc_task(GFP_ATOMIC);
 183         if (!task)
 184                 goto out;
 185         task->dev = dev;
 186         task->task_proto = SAS_PROTOCOL_STP;
 187         task->task_done = sas_ata_task_done;
 188
 189         if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
 190             qc->tf.command == ATA_CMD_FPDMA_READ ||
 191             qc->tf.command == ATA_CMD_FPDMA_RECV ||
 192             qc->tf.command == ATA_CMD_FPDMA_SEND ||
 193             qc->tf.command == ATA_CMD_NCQ_NON_DATA) {
 194                 /* Need to zero out the tag libata assigned us */
 195                 qc->tf.nsect = 0;
 196         }
 197
 198         ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
 199         task->uldd_task = qc;
 200         if (ata_is_atapi(qc->tf.protocol)) {
 201                 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
 202                 task->total_xfer_len = qc->nbytes;
 203                 task->num_scatter = qc->n_elem;
 204         } else {
 205                 for_each_sg(qc->sg, sg, qc->n_elem, si)
 206                         xfer += sg_dma_len(sg);
 207
 208                 task->total_xfer_len = xfer;
 209                 task->num_scatter = si;
 210         }
 211
 212         if (qc->tf.protocol == ATA_PROT_NODATA)
 213                 task->data_dir = DMA_NONE;
 214         else
 215                 task->data_dir = qc->dma_dir;
 216         task->scatter = qc->sg;
 217         task->ata_task.retry_count = 1;
 218         task->task_state_flags = SAS_TASK_STATE_PENDING;
 219         qc->lldd_task = task;
 220
 221         task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol);
 222         task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol);
 223
 224         if (qc->scsicmd)
 225                 ASSIGN_SAS_TASK(qc->scsicmd, task);
 226
 227         ret = i->dft->lldd_execute_task(task, GFP_ATOMIC);
 228         if (ret) {
 229                 pr_debug("lldd_execute_task returned: %d\n", ret);
 230
 231                 if (qc->scsicmd)
 232                         ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 233                 sas_free_task(task);
 234                 qc->lldd_task = NULL;
 235                 ret = AC_ERR_SYSTEM;
 236         }
 237
 238  out:
 239         spin_lock(ap->lock);
 240         return ret;
 241 }
 242
 243 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
 244 {
 245         struct domain_device *dev = qc->ap->private_data;
 246
 247         ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
 248         return true;
 249 }
 250
 251 static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
 252 {
 253         return to_sas_internal(dev->port->ha->core.shost->transportt);
 254 }
 255
 256 static int sas_get_ata_command_set(struct domain_device *dev);
 257
 258 int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
 259 {
 260         if (phy->attached_tproto & SAS_PROTOCOL_STP)
 261                 dev->tproto = phy->attached_tproto;
 262         if (phy->attached_sata_dev)
 263                 dev->tproto |= SAS_SATA_DEV;
 264
 265         if (phy->attached_dev_type == SAS_SATA_PENDING)
 266                 dev->dev_type = SAS_SATA_PENDING;
 267         else {
 268                 int res;
 269
 270                 dev->dev_type = SAS_SATA_DEV;
 271                 res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
 272                                               &dev->sata_dev.rps_resp);
 273                 if (res) {
 274                         pr_debug("report phy sata to %016llx:%02d returned 0x%x\n",
 275                                  SAS_ADDR(dev->parent->sas_addr),
 276                                  phy->phy_id, res);
 277                         return res;
 278                 }
 279                 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
 280                        sizeof(struct dev_to_host_fis));
 281                 dev->sata_dev.class = sas_get_ata_command_set(dev);
 282         }
 283         return 0;
 284 }
 285
 286 static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
 287 {
 288         int res;
 289
 290         /* we weren't pending, so successfully end the reset sequence now */
 291         if (dev->dev_type != SAS_SATA_PENDING)
 292                 return 1;
 293
 294         /* hmmm, if this succeeds do we need to repost the domain_device to the
 295          * lldd so it can pick up new parameters?
 296          */
 297         res = sas_get_ata_info(dev, phy);
 298         if (res)
 299                 return 0; /* retry */
 300         else
 301                 return 1;
 302 }
 303
 304 static int smp_ata_check_ready(struct ata_link *link)
 305 {
 306         int res;
 307         struct ata_port *ap = link->ap;
 308         struct domain_device *dev = ap->private_data;
 309         struct domain_device *ex_dev = dev->parent;
 310         struct sas_phy *phy = sas_get_local_phy(dev);
 311         struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
 312
 313         res = sas_ex_phy_discover(ex_dev, phy->number);
 314         sas_put_local_phy(phy);
 315
 316         /* break the wait early if the expander is unreachable,
 317          * otherwise keep polling
 318          */
 319         if (res == -ECOMM)
 320                 return res;
 321         if (res != SMP_RESP_FUNC_ACC)
 322                 return 0;
 323
 324         switch (ex_phy->attached_dev_type) {
 325         case SAS_SATA_PENDING:
 326                 return 0;
 327         case SAS_END_DEVICE:
 328                 if (ex_phy->attached_sata_dev)
 329                         return sas_ata_clear_pending(dev, ex_phy);
 330                 fallthrough;
 331         default:
 332                 return -ENODEV;
 333         }
 334 }
 335
 336 static int local_ata_check_ready(struct ata_link *link)
 337 {
 338         struct ata_port *ap = link->ap;
 339         struct domain_device *dev = ap->private_data;
 340         struct sas_internal *i = dev_to_sas_internal(dev);
 341
 342         if (i->dft->lldd_ata_check_ready)
 343                 return i->dft->lldd_ata_check_ready(dev);
 344         else {
 345                 /* lldd's that don't implement 'ready' checking get the
 346                  * old default behavior of not coordinating reset
 347                  * recovery with libata
 348                  */
 349                 return 1;
 350         }
 351 }
 352
 353 static int sas_ata_printk(const char *level, const struct domain_device *ddev,
 354                           const char *fmt, ...)
 355 {
 356         struct ata_port *ap = ddev->sata_dev.ap;
 357         struct device *dev = &ddev->rphy->dev;
 358         struct va_format vaf;
 359         va_list args;
 360         int r;
 361
 362         va_start(args, fmt);
 363
 364         vaf.fmt = fmt;
 365         vaf.va = &args;
 366
 367         r = printk("%s" SAS_FMT "ata%u: %s: %pV",
 368                    level, ap->print_id, dev_name(dev), &vaf);
 369
 370         va_end(args);
 371
 372         return r;
 373 }
 374
 375 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
 376                               unsigned long deadline)
 377 {
 378         int ret = 0, res;
 379         struct sas_phy *phy;
 380         struct ata_port *ap = link->ap;
 381         int (*check_ready)(struct ata_link *link);
 382         struct domain_device *dev = ap->private_data;
 383         struct sas_internal *i = dev_to_sas_internal(dev);
 384
 385         res = i->dft->lldd_I_T_nexus_reset(dev);
 386         if (res == -ENODEV)
 387                 return res;
 388
 389         if (res != TMF_RESP_FUNC_COMPLETE)
 390                 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
 391
 392         phy = sas_get_local_phy(dev);
 393         if (scsi_is_sas_phy_local(phy))
 394                 check_ready = local_ata_check_ready;
 395         else
 396                 check_ready = smp_ata_check_ready;
 397         sas_put_local_phy(phy);
 398
 399         ret = ata_wait_after_reset(link, deadline, check_ready);
 400         if (ret && ret != -EAGAIN)
 401                 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
 402
 403         *class = dev->sata_dev.class;
 404
 405         ap->cbl = ATA_CBL_SATA;
 406         return ret;
 407 }
 408
 409 /*
 410  * notify the lldd to forget the sas_task for this internal ata command
 411  * that bypasses scsi-eh
 412  */
 413 static void sas_ata_internal_abort(struct sas_task *task)
 414 {
 415         struct sas_internal *si = dev_to_sas_internal(task->dev);
 416         unsigned long flags;
 417         int res;
 418
 419         spin_lock_irqsave(&task->task_state_lock, flags);
 420         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 421             task->task_state_flags & SAS_TASK_STATE_DONE) {
 422                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 423                 pr_debug("%s: Task %p already finished.\n", __func__, task);
 424                 goto out;
 425         }
 426         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 427         spin_unlock_irqrestore(&task->task_state_lock, flags);
 428
 429         res = si->dft->lldd_abort_task(task);
 430
 431         spin_lock_irqsave(&task->task_state_lock, flags);
 432         if (task->task_state_flags & SAS_TASK_STATE_DONE ||
 433             res == TMF_RESP_FUNC_COMPLETE) {
 434                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 435                 goto out;
 436         }
 437
 438         /* XXX we are not prepared to deal with ->lldd_abort_task()
 439          * failures.  TODO: lldds need to unconditionally forget about
 440          * aborted ata tasks, otherwise we (likely) leak the sas task
 441          * here
 442          */
 443         pr_warn("%s: Task %p leaked.\n", __func__, task);
 444
 445         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 446                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 447         spin_unlock_irqrestore(&task->task_state_lock, flags);
 448
 449         return;
 450  out:
 451         sas_free_task(task);
 452 }
 453
 454 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 455 {
 456         if (qc->flags & ATA_QCFLAG_FAILED)
 457                 qc->err_mask |= AC_ERR_OTHER;
 458
 459         if (qc->err_mask) {
 460                 /*
 461                  * Find the sas_task and kill it.  By this point, libata
 462                  * has decided to kill the qc and has frozen the port.
 463                  * In this state sas_ata_task_done() will no longer free
 464                  * the sas_task, so we need to notify the lldd (via
 465                  * ->lldd_abort_task) that the task is dead and free it
 466                  *  ourselves.
 467                  */
 468                 struct sas_task *task = qc->lldd_task;
 469
 470                 qc->lldd_task = NULL;
 471                 if (!task)
 472                         return;
 473                 task->uldd_task = NULL;
 474                 sas_ata_internal_abort(task);
 475         }
 476 }
 477
 478
 479 static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
 480 {
 481         struct domain_device *dev = ap->private_data;
 482         struct sas_internal *i = dev_to_sas_internal(dev);
 483
 484         if (i->dft->lldd_ata_set_dmamode)
 485                 i->dft->lldd_ata_set_dmamode(dev);
 486 }
 487
 488 static void sas_ata_sched_eh(struct ata_port *ap)
 489 {
 490         struct domain_device *dev = ap->private_data;
 491         struct sas_ha_struct *ha = dev->port->ha;
 492         unsigned long flags;
 493
 494         spin_lock_irqsave(&ha->lock, flags);
 495         if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state))
 496                 ha->eh_active++;
 497         ata_std_sched_eh(ap);
 498         spin_unlock_irqrestore(&ha->lock, flags);
 499 }
 500
 501 void sas_ata_end_eh(struct ata_port *ap)
 502 {
 503         struct domain_device *dev = ap->private_data;
 504         struct sas_ha_struct *ha = dev->port->ha;
 505         unsigned long flags;
 506
 507         spin_lock_irqsave(&ha->lock, flags);
 508         if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state))
 509                 ha->eh_active--;
 510         spin_unlock_irqrestore(&ha->lock, flags);
 511 }
 512
 513 static int sas_ata_prereset(struct ata_link *link, unsigned long deadline)
 514 {
 515         struct ata_port *ap = link->ap;
 516         struct domain_device *dev = ap->private_data;
 517         struct sas_phy *local_phy = sas_get_local_phy(dev);
 518         int res = 0;
 519
 520         if (!local_phy->enabled || test_bit(SAS_DEV_GONE, &dev->state))
 521                 res = -ENOENT;
 522         sas_put_local_phy(local_phy);
 523
 524         return res;
 525 }
 526
 527 static struct ata_port_operations sas_sata_ops = {
 528         .prereset               = sas_ata_prereset,
 529         .hardreset              = sas_ata_hard_reset,
 530         .error_handler          = ata_std_error_handler,
 531         .post_internal_cmd      = sas_ata_post_internal,
 532         .qc_defer               = ata_std_qc_defer,
 533         .qc_prep                = ata_noop_qc_prep,
 534         .qc_issue               = sas_ata_qc_issue,
 535         .qc_fill_rtf            = sas_ata_qc_fill_rtf,
 536         .port_start             = ata_sas_port_start,
 537         .port_stop              = ata_sas_port_stop,
 538         .set_dmamode            = sas_ata_set_dmamode,
 539         .sched_eh               = sas_ata_sched_eh,
 540         .end_eh                 = sas_ata_end_eh,
 541 };
 542
 543 static struct ata_port_info sata_port_info = {
 544         .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
 545                  ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX,
 546         .pio_mask = ATA_PIO4,
 547         .mwdma_mask = ATA_MWDMA2,
 548         .udma_mask = ATA_UDMA6,
 549         .port_ops = &sas_sata_ops
 550 };
 551
 552 int sas_ata_init(struct domain_device *found_dev)
 553 {
 554         struct sas_ha_struct *ha = found_dev->port->ha;
 555         struct Scsi_Host *shost = ha->core.shost;
 556         struct ata_host *ata_host;
 557         struct ata_port *ap;
 558         int rc;
 559
 560         ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL);
 561         if (!ata_host)  {
 562                 pr_err("ata host alloc failed.\n");
 563                 return -ENOMEM;
 564         }
 565
 566         ata_host_init(ata_host, ha->dev, &sas_sata_ops);
 567
 568         ap = ata_sas_port_alloc(ata_host, &sata_port_info, shost);
 569         if (!ap) {
 570                 pr_err("ata_sas_port_alloc failed.\n");
 571                 rc = -ENODEV;
 572                 goto free_host;
 573         }
 574
 575         ap->private_data = found_dev;
 576         ap->cbl = ATA_CBL_SATA;
 577         ap->scsi_host = shost;
 578         rc = ata_sas_port_init(ap);
 579         if (rc)
 580                 goto destroy_port;
 581
 582         rc = ata_sas_tport_add(ata_host->dev, ap);
 583         if (rc)
 584                 goto destroy_port;
 585
 586         found_dev->sata_dev.ata_host = ata_host;
 587         found_dev->sata_dev.ap = ap;
 588
 589         return 0;
 590
 591 destroy_port:
 592         ata_sas_port_destroy(ap);
 593 free_host:
 594         ata_host_put(ata_host);
 595         return rc;
 596 }
 597
 598 void sas_ata_task_abort(struct sas_task *task)
 599 {
 600         struct ata_queued_cmd *qc = task->uldd_task;
 601         struct completion *waiting;
 602
 603         /* Bounce SCSI-initiated commands to the SCSI EH */
 604         if (qc->scsicmd) {
 605                 blk_abort_request(qc->scsicmd->request);
 606                 return;
 607         }
 608
 609         /* Internal command, fake a timeout and complete. */
 610         qc->flags &= ~ATA_QCFLAG_ACTIVE;
 611         qc->flags |= ATA_QCFLAG_FAILED;
 612         qc->err_mask |= AC_ERR_TIMEOUT;
 613         waiting = qc->private_data;
 614         complete(waiting);
 615 }
 616
 617 static int sas_get_ata_command_set(struct domain_device *dev)
 618 {
 619         struct dev_to_host_fis *fis =
 620                 (struct dev_to_host_fis *) dev->frame_rcvd;
 621         struct ata_taskfile tf;
 622
 623         if (dev->dev_type == SAS_SATA_PENDING)
 624                 return ATA_DEV_UNKNOWN;
 625
 626         ata_tf_from_fis((const u8 *)fis, &tf);
 627
 628         return ata_dev_classify(&tf);
 629 }
 630
 631 void sas_probe_sata(struct asd_sas_port *port)
 632 {
 633         struct domain_device *dev, *n;
 634
 635         mutex_lock(&port->ha->disco_mutex);
 636         list_for_each_entry(dev, &port->disco_list, disco_list_node) {
 637                 if (!dev_is_sata(dev))
 638                         continue;
 639
 640                 ata_sas_async_probe(dev->sata_dev.ap);
 641         }
 642         mutex_unlock(&port->ha->disco_mutex);
 643
 644         list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
 645                 if (!dev_is_sata(dev))
 646                         continue;
 647
 648                 sas_ata_wait_eh(dev);
 649
 650                 /* if libata could not bring the link up, don't surface
 651                  * the device
 652                  */
 653                 if (!ata_dev_enabled(sas_to_ata_dev(dev)))
 654                         sas_fail_probe(dev, __func__, -ENODEV);
 655         }
 656
 657 }
 658
 659 static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
 660 {
 661         struct domain_device *dev, *n;
 662
 663         list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
 664                 if (!dev_is_sata(dev))
 665                         continue;
 666
 667                 sas_ata_wait_eh(dev);
 668
 669                 /* if libata failed to power manage the device, tear it down */
 670                 if (ata_dev_disabled(sas_to_ata_dev(dev)))
 671                         sas_fail_probe(dev, func, -ENODEV);
 672         }
 673 }
 674
 675 void sas_suspend_sata(struct asd_sas_port *port)
 676 {
 677         struct domain_device *dev;
 678
 679         mutex_lock(&port->ha->disco_mutex);
 680         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 681                 struct sata_device *sata;
 682
 683                 if (!dev_is_sata(dev))
 684                         continue;
 685
 686                 sata = &dev->sata_dev;
 687                 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND)
 688                         continue;
 689
 690                 ata_sas_port_suspend(sata->ap);
 691         }
 692         mutex_unlock(&port->ha->disco_mutex);
 693
 694         sas_ata_flush_pm_eh(port, __func__);
 695 }
 696
 697 void sas_resume_sata(struct asd_sas_port *port)
 698 {
 699         struct domain_device *dev;
 700
 701         mutex_lock(&port->ha->disco_mutex);
 702         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 703                 struct sata_device *sata;
 704
 705                 if (!dev_is_sata(dev))
 706                         continue;
 707
 708                 sata = &dev->sata_dev;
 709                 if (sata->ap->pm_mesg.event == PM_EVENT_ON)
 710                         continue;
 711
 712                 ata_sas_port_resume(sata->ap);
 713         }
 714         mutex_unlock(&port->ha->disco_mutex);
 715
 716         sas_ata_flush_pm_eh(port, __func__);
 717 }
 718
 719 /**
 720  * sas_discover_sata - discover an STP/SATA domain device
 721  * @dev: pointer to struct domain_device of interest
 722  *
 723  * Devices directly attached to a HA port, have no parents.  All other
 724  * devices do, and should have their "parent" pointer set appropriately
 725  * before calling this function.
 726  */
 727 int sas_discover_sata(struct domain_device *dev)
 728 {
 729         if (dev->dev_type == SAS_SATA_PM)
 730                 return -ENODEV;
 731
 732         dev->sata_dev.class = sas_get_ata_command_set(dev);
 733         sas_fill_in_rphy(dev, dev->rphy);
 734
 735         return sas_notify_lldd_dev_found(dev);
 736 }
 737
 738 static void async_sas_ata_eh(void *data, async_cookie_t cookie)
 739 {
 740         struct domain_device *dev = data;
 741         struct ata_port *ap = dev->sata_dev.ap;
 742         struct sas_ha_struct *ha = dev->port->ha;
 743
 744         sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
 745         ata_scsi_port_error_handler(ha->core.shost, ap);
 746         sas_put_device(dev);
 747 }
 748
 749 void sas_ata_strategy_handler(struct Scsi_Host *shost)
 750 {
 751         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 752         ASYNC_DOMAIN_EXCLUSIVE(async);
 753         int i;
 754
 755         /* it's ok to defer revalidation events during ata eh, these
 756          * disks are in one of three states:
 757          * 1/ present for initial domain discovery, and these
 758          *    resets will cause bcn flutters
 759          * 2/ hot removed, we'll discover that after eh fails
 760          * 3/ hot added after initial discovery, lost the race, and need
 761          *    to catch the next train.
 762          */
 763         sas_disable_revalidation(sas_ha);
 764
 765         spin_lock_irq(&sas_ha->phy_port_lock);
 766         for (i = 0; i < sas_ha->num_phys; i++) {
 767                 struct asd_sas_port *port = sas_ha->sas_port[i];
 768                 struct domain_device *dev;
 769
 770                 spin_lock(&port->dev_list_lock);
 771                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 772                         if (!dev_is_sata(dev))
 773                                 continue;
 774
 775                         /* hold a reference over eh since we may be
 776                          * racing with final remove once all commands
 777                          * are completed
 778                          */
 779                         kref_get(&dev->kref);
 780
 781                         async_schedule_domain(async_sas_ata_eh, dev, &async);
 782                 }
 783                 spin_unlock(&port->dev_list_lock);
 784         }
 785         spin_unlock_irq(&sas_ha->phy_port_lock);
 786
 787         async_synchronize_full_domain(&async);
 788
 789         sas_enable_revalidation(sas_ha);
 790 }
 791
 792 void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 793                 struct list_head *done_q)
 794 {
 795         struct scsi_cmnd *cmd, *n;
 796         struct domain_device *eh_dev;
 797
 798         do {
 799                 LIST_HEAD(sata_q);
 800                 eh_dev = NULL;
 801
 802                 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 803                         struct domain_device *ddev = cmd_to_domain_dev(cmd);
 804
 805                         if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
 806                                 continue;
 807                         if (eh_dev && eh_dev != ddev)
 808                                 continue;
 809                         eh_dev = ddev;
 810                         list_move(&cmd->eh_entry, &sata_q);
 811                 }
 812
 813                 if (!list_empty(&sata_q)) {
 814                         struct ata_port *ap = eh_dev->sata_dev.ap;
 815
 816                         sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
 817                         ata_scsi_cmd_error_handler(shost, ap, &sata_q);
 818                         /*
 819                          * ata's error handler may leave the cmd on the list
 820                          * so make sure they don't remain on a stack list
 821                          * about to go out of scope.
 822                          *
 823                          * This looks strange, since the commands are
 824                          * now part of no list, but the next error
 825                          * action will be ata_port_error_handler()
 826                          * which takes no list and sweeps them up
 827                          * anyway from the ata tag array.
 828                          */
 829                         while (!list_empty(&sata_q))
 830                                 list_del_init(sata_q.next);
 831                 }
 832         } while (eh_dev);
 833 }
 834
 835 void sas_ata_schedule_reset(struct domain_device *dev)
 836 {
 837         struct ata_eh_info *ehi;
 838         struct ata_port *ap;
 839         unsigned long flags;
 840
 841         if (!dev_is_sata(dev))
 842                 return;
 843
 844         ap = dev->sata_dev.ap;
 845         ehi = &ap->link.eh_info;
 846
 847         spin_lock_irqsave(ap->lock, flags);
 848         ehi->err_mask |= AC_ERR_TIMEOUT;
 849         ehi->action |= ATA_EH_RESET;
 850         ata_port_schedule_eh(ap);
 851         spin_unlock_irqrestore(ap->lock, flags);
 852 }
 853 EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
 854
 855 void sas_ata_wait_eh(struct domain_device *dev)
 856 {
 857         struct ata_port *ap;
 858
 859         if (!dev_is_sata(dev))
 860                 return;
 861
 862         ap = dev->sata_dev.ap;
 863         ata_port_wait_eh(ap);
 864 }