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         case SAS_INTERRUPTED:
  41         case SAS_PHY_DOWN:
  42         case SAS_NAK_R_ERR:
  43                 return AC_ERR_ATA_BUS;
  44         case SAS_DATA_UNDERRUN:
  45                 /*
  46                  * Some programs that use the taskfile interface
  47                  * (smartctl in particular) can cause underrun
  48                  * problems.  Ignore these errors, perhaps at our
  49                  * peril.
  50                  */
  51                 return 0;
  52         case SAS_DATA_OVERRUN:
  53         case SAS_QUEUE_FULL:
  54         case SAS_DEVICE_UNKNOWN:
  55         case SAS_OPEN_TO:
  56         case SAS_OPEN_REJECT:
  57                 pr_warn("%s: Saw error %d.  What to do?\n",
  58                         __func__, ts->stat);
  59                 return AC_ERR_OTHER;
  60         case SAM_STAT_CHECK_CONDITION:
  61         case SAS_ABORTED_TASK:
  62                 return AC_ERR_DEV;
  63         case SAS_PROTO_RESPONSE:
  64                 /* This means the ending_fis has the error
  65                  * value; return 0 here to collect it
  66                  */
  67                 return 0;
  68         default:
  69                 return 0;
  70         }
  71 }
  72
  73 static void sas_ata_task_done(struct sas_task *task)
  74 {
  75         struct ata_queued_cmd *qc = task->uldd_task;
  76         struct domain_device *dev = task->dev;
  77         struct task_status_struct *stat = &task->task_status;
  78         struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
  79         struct sas_ha_struct *sas_ha = dev->port->ha;
  80         enum ata_completion_errors ac;
  81         unsigned long flags;
  82         struct ata_link *link;
  83         struct ata_port *ap;
  84
  85         spin_lock_irqsave(&dev->done_lock, flags);
  86         if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
  87                 task = NULL;
  88         else if (qc && qc->scsicmd)
  89                 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
  90         spin_unlock_irqrestore(&dev->done_lock, flags);
  91
  92         /* check if libsas-eh got to the task before us */
  93         if (unlikely(!task))
  94                 return;
  95
  96         if (!qc)
  97                 goto qc_already_gone;
  98
  99         ap = qc->ap;
 100         link = &ap->link;
 101
 102         spin_lock_irqsave(ap->lock, flags);
 103         /* check if we lost the race with libata/sas_ata_post_internal() */
 104         if (unlikely(ata_port_is_frozen(ap))) {
 105                 spin_unlock_irqrestore(ap->lock, flags);
 106                 if (qc->scsicmd)
 107                         goto qc_already_gone;
 108                 else {
 109                         /* if eh is not involved and the port is frozen then the
 110                          * ata internal abort process has taken responsibility
 111                          * for this sas_task
 112                          */
 113                         return;
 114                 }
 115         }
 116
 117         if (stat->stat == SAS_PROTO_RESPONSE ||
 118             stat->stat == SAS_SAM_STAT_GOOD ||
 119             (stat->stat == SAS_SAM_STAT_CHECK_CONDITION &&
 120               dev->sata_dev.class == ATA_DEV_ATAPI)) {
 121                 memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE);
 122
 123                 if (!link->sactive) {
 124                         qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
 125                 } else {
 126                         link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
 127                         if (unlikely(link->eh_info.err_mask))
 128                                 qc->flags |= ATA_QCFLAG_EH;
 129                 }
 130         } else {
 131                 ac = sas_to_ata_err(stat);
 132                 if (ac) {
 133                         pr_warn("%s: SAS error 0x%x\n", __func__, stat->stat);
 134                         /* We saw a SAS error. Send a vague error. */
 135                         if (!link->sactive) {
 136                                 qc->err_mask = ac;
 137                         } else {
 138                                 link->eh_info.err_mask |= AC_ERR_DEV;
 139                                 qc->flags |= ATA_QCFLAG_EH;
 140                         }
 141
 142                         dev->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
 143                         dev->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
 144                 }
 145         }
 146
 147         qc->lldd_task = NULL;
 148         ata_qc_complete(qc);
 149         spin_unlock_irqrestore(ap->lock, flags);
 150
 151 qc_already_gone:
 152         sas_free_task(task);
 153 }
 154
 155 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 156         __must_hold(ap->lock)
 157 {
 158         struct sas_task *task;
 159         struct scatterlist *sg;
 160         int ret = AC_ERR_SYSTEM;
 161         unsigned int si, xfer = 0;
 162         struct ata_port *ap = qc->ap;
 163         struct domain_device *dev = ap->private_data;
 164         struct sas_ha_struct *sas_ha = dev->port->ha;
 165         struct Scsi_Host *host = sas_ha->shost;
 166         struct sas_internal *i = to_sas_internal(host->transportt);
 167
 168         /* TODO: we should try to remove that unlock */
 169         spin_unlock(ap->lock);
 170
 171         /* If the device fell off, no sense in issuing commands */
 172         if (test_bit(SAS_DEV_GONE, &dev->state))
 173                 goto out;
 174
 175         task = sas_alloc_task(GFP_ATOMIC);
 176         if (!task)
 177                 goto out;
 178         task->dev = dev;
 179         task->task_proto = SAS_PROTOCOL_STP;
 180         task->task_done = sas_ata_task_done;
 181
 182         /* For NCQ commands, zero out the tag libata assigned us */
 183         if (ata_is_ncq(qc->tf.protocol))
 184                 qc->tf.nsect = 0;
 185
 186         ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
 187         task->uldd_task = qc;
 188         if (ata_is_atapi(qc->tf.protocol)) {
 189                 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
 190                 task->total_xfer_len = qc->nbytes;
 191                 task->num_scatter = qc->n_elem;
 192                 task->data_dir = qc->dma_dir;
 193         } else if (!ata_is_data(qc->tf.protocol)) {
 194                 task->data_dir = DMA_NONE;
 195         } else {
 196                 for_each_sg(qc->sg, sg, qc->n_elem, si)
 197                         xfer += sg_dma_len(sg);
 198
 199                 task->total_xfer_len = xfer;
 200                 task->num_scatter = si;
 201                 task->data_dir = qc->dma_dir;
 202         }
 203         task->scatter = qc->sg;
 204         qc->lldd_task = task;
 205
 206         task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol);
 207         task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol);
 208
 209         if (qc->flags & ATA_QCFLAG_RESULT_TF)
 210                 task->ata_task.return_fis_on_success = 1;
 211
 212         if (qc->scsicmd)
 213                 ASSIGN_SAS_TASK(qc->scsicmd, task);
 214
 215         ret = i->dft->lldd_execute_task(task, GFP_ATOMIC);
 216         if (ret) {
 217                 pr_debug("lldd_execute_task returned: %d\n", ret);
 218
 219                 if (qc->scsicmd)
 220                         ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 221                 sas_free_task(task);
 222                 qc->lldd_task = NULL;
 223                 ret = AC_ERR_SYSTEM;
 224         }
 225
 226  out:
 227         spin_lock(ap->lock);
 228         return ret;
 229 }
 230
 231 static void sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
 232 {
 233         struct domain_device *dev = qc->ap->private_data;
 234
 235         ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
 236 }
 237
 238 static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
 239 {
 240         return to_sas_internal(dev->port->ha->shost->transportt);
 241 }
 242
 243 static int sas_get_ata_command_set(struct domain_device *dev)
 244 {
 245         struct ata_taskfile tf;
 246
 247         if (dev->dev_type == SAS_SATA_PENDING)
 248                 return ATA_DEV_UNKNOWN;
 249
 250         ata_tf_from_fis(dev->frame_rcvd, &tf);
 251
 252         return ata_dev_classify(&tf);
 253 }
 254
 255 int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
 256 {
 257         if (phy->attached_tproto & SAS_PROTOCOL_STP)
 258                 dev->tproto = phy->attached_tproto;
 259         if (phy->attached_sata_dev)
 260                 dev->tproto |= SAS_SATA_DEV;
 261
 262         if (phy->attached_dev_type == SAS_SATA_PENDING)
 263                 dev->dev_type = SAS_SATA_PENDING;
 264         else {
 265                 int res;
 266
 267                 dev->dev_type = SAS_SATA_DEV;
 268                 res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
 269                                               &dev->sata_dev.rps_resp);
 270                 if (res) {
 271                         pr_debug("report phy sata to %016llx:%02d returned 0x%x\n",
 272                                  SAS_ADDR(dev->parent->sas_addr),
 273                                  phy->phy_id, res);
 274                         return res;
 275                 }
 276                 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
 277                        sizeof(struct dev_to_host_fis));
 278                 dev->sata_dev.class = sas_get_ata_command_set(dev);
 279         }
 280         return 0;
 281 }
 282
 283 static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
 284 {
 285         int res;
 286
 287         /* we weren't pending, so successfully end the reset sequence now */
 288         if (dev->dev_type != SAS_SATA_PENDING)
 289                 return 1;
 290
 291         /* hmmm, if this succeeds do we need to repost the domain_device to the
 292          * lldd so it can pick up new parameters?
 293          */
 294         res = sas_get_ata_info(dev, phy);
 295         if (res)
 296                 return 0; /* retry */
 297         else
 298                 return 1;
 299 }
 300
 301 int smp_ata_check_ready_type(struct ata_link *link)
 302 {
 303         struct domain_device *dev = link->ap->private_data;
 304         struct sas_phy *phy = sas_get_local_phy(dev);
 305         struct domain_device *ex_dev = dev->parent;
 306         enum sas_device_type type = SAS_PHY_UNUSED;
 307         u8 sas_addr[SAS_ADDR_SIZE];
 308         int res;
 309
 310         res = sas_get_phy_attached_dev(ex_dev, phy->number, sas_addr, &type);
 311         sas_put_local_phy(phy);
 312         if (res)
 313                 return res;
 314
 315         switch (type) {
 316         case SAS_SATA_PENDING:
 317                 return 0;
 318         case SAS_END_DEVICE:
 319                 return 1;
 320         default:
 321                 return -ENODEV;
 322         }
 323 }
 324 EXPORT_SYMBOL_GPL(smp_ata_check_ready_type);
 325
 326 static int smp_ata_check_ready(struct ata_link *link)
 327 {
 328         int res;
 329         struct ata_port *ap = link->ap;
 330         struct domain_device *dev = ap->private_data;
 331         struct domain_device *ex_dev = dev->parent;
 332         struct sas_phy *phy = sas_get_local_phy(dev);
 333         struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
 334
 335         res = sas_ex_phy_discover(ex_dev, phy->number);
 336         sas_put_local_phy(phy);
 337
 338         /* break the wait early if the expander is unreachable,
 339          * otherwise keep polling
 340          */
 341         if (res == -ECOMM)
 342                 return res;
 343         if (res != SMP_RESP_FUNC_ACC)
 344                 return 0;
 345
 346         switch (ex_phy->attached_dev_type) {
 347         case SAS_SATA_PENDING:
 348                 return 0;
 349         case SAS_END_DEVICE:
 350                 if (ex_phy->attached_sata_dev)
 351                         return sas_ata_clear_pending(dev, ex_phy);
 352                 fallthrough;
 353         default:
 354                 return -ENODEV;
 355         }
 356 }
 357
 358 static int local_ata_check_ready(struct ata_link *link)
 359 {
 360         struct ata_port *ap = link->ap;
 361         struct domain_device *dev = ap->private_data;
 362         struct sas_internal *i = dev_to_sas_internal(dev);
 363
 364         if (i->dft->lldd_ata_check_ready)
 365                 return i->dft->lldd_ata_check_ready(dev);
 366         else {
 367                 /* lldd's that don't implement 'ready' checking get the
 368                  * old default behavior of not coordinating reset
 369                  * recovery with libata
 370                  */
 371                 return 1;
 372         }
 373 }
 374
 375 static int sas_ata_printk(const char *level, const struct domain_device *ddev,
 376                           const char *fmt, ...)
 377 {
 378         struct ata_port *ap = ddev->sata_dev.ap;
 379         struct device *dev = &ddev->rphy->dev;
 380         struct va_format vaf;
 381         va_list args;
 382         int r;
 383
 384         va_start(args, fmt);
 385
 386         vaf.fmt = fmt;
 387         vaf.va = &args;
 388
 389         r = printk("%s" SAS_FMT "ata%u: %s: %pV",
 390                    level, ap->print_id, dev_name(dev), &vaf);
 391
 392         va_end(args);
 393
 394         return r;
 395 }
 396
 397 static int sas_ata_wait_after_reset(struct domain_device *dev, unsigned long deadline)
 398 {
 399         struct sata_device *sata_dev = &dev->sata_dev;
 400         int (*check_ready)(struct ata_link *link);
 401         struct ata_port *ap = sata_dev->ap;
 402         struct ata_link *link = &ap->link;
 403         struct sas_phy *phy;
 404         int ret;
 405
 406         phy = sas_get_local_phy(dev);
 407         if (scsi_is_sas_phy_local(phy))
 408                 check_ready = local_ata_check_ready;
 409         else
 410                 check_ready = smp_ata_check_ready;
 411         sas_put_local_phy(phy);
 412
 413         ret = ata_wait_after_reset(link, deadline, check_ready);
 414         if (ret && ret != -EAGAIN)
 415                 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
 416
 417         return ret;
 418 }
 419
 420 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
 421                               unsigned long deadline)
 422 {
 423         struct ata_port *ap = link->ap;
 424         struct domain_device *dev = ap->private_data;
 425         struct sas_internal *i = dev_to_sas_internal(dev);
 426         int ret;
 427
 428         ret = i->dft->lldd_I_T_nexus_reset(dev);
 429         if (ret == -ENODEV)
 430                 return ret;
 431
 432         if (ret != TMF_RESP_FUNC_COMPLETE)
 433                 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
 434
 435         ret = sas_ata_wait_after_reset(dev, deadline);
 436
 437         *class = dev->sata_dev.class;
 438
 439         ap->cbl = ATA_CBL_SATA;
 440         return ret;
 441 }
 442
 443 /*
 444  * notify the lldd to forget the sas_task for this internal ata command
 445  * that bypasses scsi-eh
 446  */
 447 static void sas_ata_internal_abort(struct sas_task *task)
 448 {
 449         struct sas_internal *si = dev_to_sas_internal(task->dev);
 450         unsigned long flags;
 451         int res;
 452
 453         spin_lock_irqsave(&task->task_state_lock, flags);
 454         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 455             task->task_state_flags & SAS_TASK_STATE_DONE) {
 456                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 457                 pr_debug("%s: Task %p already finished.\n", __func__, task);
 458                 goto out;
 459         }
 460         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 461         spin_unlock_irqrestore(&task->task_state_lock, flags);
 462
 463         res = si->dft->lldd_abort_task(task);
 464
 465         spin_lock_irqsave(&task->task_state_lock, flags);
 466         if (task->task_state_flags & SAS_TASK_STATE_DONE ||
 467             res == TMF_RESP_FUNC_COMPLETE) {
 468                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 469                 goto out;
 470         }
 471
 472         /* XXX we are not prepared to deal with ->lldd_abort_task()
 473          * failures.  TODO: lldds need to unconditionally forget about
 474          * aborted ata tasks, otherwise we (likely) leak the sas task
 475          * here
 476          */
 477         pr_warn("%s: Task %p leaked.\n", __func__, task);
 478
 479         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 480                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 481         spin_unlock_irqrestore(&task->task_state_lock, flags);
 482
 483         return;
 484  out:
 485         sas_free_task(task);
 486 }
 487
 488 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 489 {
 490         if (qc->flags & ATA_QCFLAG_EH)
 491                 qc->err_mask |= AC_ERR_OTHER;
 492
 493         if (qc->err_mask) {
 494                 /*
 495                  * Find the sas_task and kill it.  By this point, libata
 496                  * has decided to kill the qc and has frozen the port.
 497                  * In this state sas_ata_task_done() will no longer free
 498                  * the sas_task, so we need to notify the lldd (via
 499                  * ->lldd_abort_task) that the task is dead and free it
 500                  *  ourselves.
 501                  */
 502                 struct sas_task *task = qc->lldd_task;
 503
 504                 qc->lldd_task = NULL;
 505                 if (!task)
 506                         return;
 507                 task->uldd_task = NULL;
 508                 sas_ata_internal_abort(task);
 509         }
 510 }
 511
 512
 513 static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
 514 {
 515         struct domain_device *dev = ap->private_data;
 516         struct sas_internal *i = dev_to_sas_internal(dev);
 517
 518         if (i->dft->lldd_ata_set_dmamode)
 519                 i->dft->lldd_ata_set_dmamode(dev);
 520 }
 521
 522 static void sas_ata_sched_eh(struct ata_port *ap)
 523 {
 524         struct domain_device *dev = ap->private_data;
 525         struct sas_ha_struct *ha = dev->port->ha;
 526         unsigned long flags;
 527
 528         spin_lock_irqsave(&ha->lock, flags);
 529         if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state))
 530                 ha->eh_active++;
 531         ata_std_sched_eh(ap);
 532         spin_unlock_irqrestore(&ha->lock, flags);
 533 }
 534
 535 void sas_ata_end_eh(struct ata_port *ap)
 536 {
 537         struct domain_device *dev = ap->private_data;
 538         struct sas_ha_struct *ha = dev->port->ha;
 539         unsigned long flags;
 540
 541         spin_lock_irqsave(&ha->lock, flags);
 542         if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state))
 543                 ha->eh_active--;
 544         spin_unlock_irqrestore(&ha->lock, flags);
 545 }
 546
 547 static int sas_ata_prereset(struct ata_link *link, unsigned long deadline)
 548 {
 549         struct ata_port *ap = link->ap;
 550         struct domain_device *dev = ap->private_data;
 551         struct sas_phy *local_phy = sas_get_local_phy(dev);
 552         int res = 0;
 553
 554         if (!local_phy->enabled || test_bit(SAS_DEV_GONE, &dev->state))
 555                 res = -ENOENT;
 556         sas_put_local_phy(local_phy);
 557
 558         return res;
 559 }
 560
 561 static struct ata_port_operations sas_sata_ops = {
 562         .prereset               = sas_ata_prereset,
 563         .hardreset              = sas_ata_hard_reset,
 564         .error_handler          = ata_std_error_handler,
 565         .post_internal_cmd      = sas_ata_post_internal,
 566         .qc_defer               = ata_std_qc_defer,
 567         .qc_issue               = sas_ata_qc_issue,
 568         .qc_fill_rtf            = sas_ata_qc_fill_rtf,
 569         .set_dmamode            = sas_ata_set_dmamode,
 570         .sched_eh               = sas_ata_sched_eh,
 571         .end_eh                 = sas_ata_end_eh,
 572 };
 573
 574 int sas_ata_init(struct domain_device *found_dev)
 575 {
 576         struct sas_ha_struct *ha = found_dev->port->ha;
 577         struct Scsi_Host *shost = ha->shost;
 578         struct ata_host *ata_host;
 579         struct ata_port *ap;
 580         int rc;
 581
 582         ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL);
 583         if (!ata_host)  {
 584                 pr_err("ata host alloc failed.\n");
 585                 return -ENOMEM;
 586         }
 587
 588         ata_host_init(ata_host, ha->dev, &sas_sata_ops);
 589
 590         ap = ata_port_alloc(ata_host);
 591         if (!ap) {
 592                 pr_err("ata_port_alloc failed.\n");
 593                 rc = -ENODEV;
 594                 goto free_host;
 595         }
 596
 597         ap->port_no = 0;
 598         ap->pio_mask = ATA_PIO4;
 599         ap->mwdma_mask = ATA_MWDMA2;
 600         ap->udma_mask = ATA_UDMA6;
 601         ap->flags |= ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
 602                      ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX;
 603         ap->ops = &sas_sata_ops;
 604         ap->private_data = found_dev;
 605         ap->cbl = ATA_CBL_SATA;
 606         ap->scsi_host = shost;
 607
 608         rc = ata_tport_add(ata_host->dev, ap);
 609         if (rc)
 610                 goto free_port;
 611
 612         found_dev->sata_dev.ata_host = ata_host;
 613         found_dev->sata_dev.ap = ap;
 614
 615         return 0;
 616
 617 free_port:
 618         ata_port_free(ap);
 619 free_host:
 620         ata_host_put(ata_host);
 621         return rc;
 622 }
 623
 624 void sas_ata_task_abort(struct sas_task *task)
 625 {
 626         struct ata_queued_cmd *qc = task->uldd_task;
 627         struct completion *waiting;
 628
 629         /* Bounce SCSI-initiated commands to the SCSI EH */
 630         if (qc->scsicmd) {
 631                 blk_abort_request(scsi_cmd_to_rq(qc->scsicmd));
 632                 return;
 633         }
 634
 635         /* Internal command, fake a timeout and complete. */
 636         qc->flags &= ~ATA_QCFLAG_ACTIVE;
 637         qc->flags |= ATA_QCFLAG_EH;
 638         qc->err_mask |= AC_ERR_TIMEOUT;
 639         waiting = qc->private_data;
 640         complete(waiting);
 641 }
 642
 643 void sas_probe_sata(struct asd_sas_port *port)
 644 {
 645         struct domain_device *dev, *n;
 646
 647         mutex_lock(&port->ha->disco_mutex);
 648         list_for_each_entry(dev, &port->disco_list, disco_list_node) {
 649                 if (!dev_is_sata(dev))
 650                         continue;
 651
 652                 ata_port_probe(dev->sata_dev.ap);
 653         }
 654         mutex_unlock(&port->ha->disco_mutex);
 655
 656         list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
 657                 if (!dev_is_sata(dev))
 658                         continue;
 659
 660                 sas_ata_wait_eh(dev);
 661
 662                 /* if libata could not bring the link up, don't surface
 663                  * the device
 664                  */
 665                 if (!ata_dev_enabled(sas_to_ata_dev(dev)))
 666                         sas_fail_probe(dev, __func__, -ENODEV);
 667         }
 668
 669 }
 670
 671 int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *phy,
 672                     struct domain_device *child, int phy_id)
 673 {
 674         struct sas_rphy *rphy;
 675         int ret;
 676
 677         if (child->linkrate > parent->min_linkrate) {
 678                 struct sas_phy *cphy = child->phy;
 679                 enum sas_linkrate min_prate = cphy->minimum_linkrate,
 680                         parent_min_lrate = parent->min_linkrate,
 681                         min_linkrate = (min_prate > parent_min_lrate) ?
 682                                         parent_min_lrate : 0;
 683                 struct sas_phy_linkrates rates = {
 684                         .maximum_linkrate = parent->min_linkrate,
 685                         .minimum_linkrate = min_linkrate,
 686                 };
 687
 688                 pr_notice("ex %016llx phy%02d SATA device linkrate > min pathway connection rate, attempting to lower device linkrate\n",
 689                           SAS_ADDR(child->sas_addr), phy_id);
 690                 ret = sas_smp_phy_control(parent, phy_id,
 691                                           PHY_FUNC_LINK_RESET, &rates);
 692                 if (ret) {
 693                         pr_err("ex %016llx phy%02d SATA device could not set linkrate (%d)\n",
 694                                SAS_ADDR(child->sas_addr), phy_id, ret);
 695                         return ret;
 696                 }
 697                 pr_notice("ex %016llx phy%02d SATA device set linkrate successfully\n",
 698                           SAS_ADDR(child->sas_addr), phy_id);
 699                 child->linkrate = child->min_linkrate;
 700         }
 701         ret = sas_get_ata_info(child, phy);
 702         if (ret)
 703                 return ret;
 704
 705         sas_init_dev(child);
 706         ret = sas_ata_init(child);
 707         if (ret)
 708                 return ret;
 709
 710         rphy = sas_end_device_alloc(phy->port);
 711         if (!rphy)
 712                 return -ENOMEM;
 713
 714         rphy->identify.phy_identifier = phy_id;
 715         child->rphy = rphy;
 716         get_device(&rphy->dev);
 717
 718         list_add_tail(&child->disco_list_node, &parent->port->disco_list);
 719
 720         ret = sas_discover_sata(child);
 721         if (ret) {
 722                 pr_notice("sas_discover_sata() for device %16llx at %016llx:%02d returned 0x%x\n",
 723                           SAS_ADDR(child->sas_addr),
 724                           SAS_ADDR(parent->sas_addr), phy_id, ret);
 725                 sas_rphy_free(child->rphy);
 726                 list_del(&child->disco_list_node);
 727                 return ret;
 728         }
 729
 730         return 0;
 731 }
 732
 733 static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
 734 {
 735         struct domain_device *dev, *n;
 736
 737         list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
 738                 if (!dev_is_sata(dev))
 739                         continue;
 740
 741                 sas_ata_wait_eh(dev);
 742
 743                 /* if libata failed to power manage the device, tear it down */
 744                 if (ata_dev_disabled(sas_to_ata_dev(dev)))
 745                         sas_fail_probe(dev, func, -ENODEV);
 746         }
 747 }
 748
 749 void sas_suspend_sata(struct asd_sas_port *port)
 750 {
 751         struct domain_device *dev;
 752
 753         mutex_lock(&port->ha->disco_mutex);
 754         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 755                 struct sata_device *sata;
 756
 757                 if (!dev_is_sata(dev))
 758                         continue;
 759
 760                 sata = &dev->sata_dev;
 761                 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND)
 762                         continue;
 763
 764                 ata_sas_port_suspend(sata->ap);
 765         }
 766         mutex_unlock(&port->ha->disco_mutex);
 767
 768         sas_ata_flush_pm_eh(port, __func__);
 769 }
 770
 771 void sas_resume_sata(struct asd_sas_port *port)
 772 {
 773         struct domain_device *dev;
 774
 775         mutex_lock(&port->ha->disco_mutex);
 776         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 777                 struct sata_device *sata;
 778
 779                 if (!dev_is_sata(dev))
 780                         continue;
 781
 782                 sata = &dev->sata_dev;
 783                 if (sata->ap->pm_mesg.event == PM_EVENT_ON)
 784                         continue;
 785
 786                 ata_sas_port_resume(sata->ap);
 787         }
 788         mutex_unlock(&port->ha->disco_mutex);
 789
 790         sas_ata_flush_pm_eh(port, __func__);
 791 }
 792
 793 /**
 794  * sas_discover_sata - discover an STP/SATA domain device
 795  * @dev: pointer to struct domain_device of interest
 796  *
 797  * Devices directly attached to a HA port, have no parents.  All other
 798  * devices do, and should have their "parent" pointer set appropriately
 799  * before calling this function.
 800  */
 801 int sas_discover_sata(struct domain_device *dev)
 802 {
 803         if (dev->dev_type == SAS_SATA_PM)
 804                 return -ENODEV;
 805
 806         dev->sata_dev.class = sas_get_ata_command_set(dev);
 807         sas_fill_in_rphy(dev, dev->rphy);
 808
 809         return sas_notify_lldd_dev_found(dev);
 810 }
 811
 812 static void async_sas_ata_eh(void *data, async_cookie_t cookie)
 813 {
 814         struct domain_device *dev = data;
 815         struct ata_port *ap = dev->sata_dev.ap;
 816         struct sas_ha_struct *ha = dev->port->ha;
 817
 818         sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
 819         ata_scsi_port_error_handler(ha->shost, ap);
 820         sas_put_device(dev);
 821 }
 822
 823 void sas_ata_strategy_handler(struct Scsi_Host *shost)
 824 {
 825         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 826         ASYNC_DOMAIN_EXCLUSIVE(async);
 827         int i;
 828
 829         /* it's ok to defer revalidation events during ata eh, these
 830          * disks are in one of three states:
 831          * 1/ present for initial domain discovery, and these
 832          *    resets will cause bcn flutters
 833          * 2/ hot removed, we'll discover that after eh fails
 834          * 3/ hot added after initial discovery, lost the race, and need
 835          *    to catch the next train.
 836          */
 837         sas_disable_revalidation(sas_ha);
 838
 839         spin_lock_irq(&sas_ha->phy_port_lock);
 840         for (i = 0; i < sas_ha->num_phys; i++) {
 841                 struct asd_sas_port *port = sas_ha->sas_port[i];
 842                 struct domain_device *dev;
 843
 844                 spin_lock(&port->dev_list_lock);
 845                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 846                         if (!dev_is_sata(dev))
 847                                 continue;
 848
 849                         /* hold a reference over eh since we may be
 850                          * racing with final remove once all commands
 851                          * are completed
 852                          */
 853                         kref_get(&dev->kref);
 854
 855                         async_schedule_domain(async_sas_ata_eh, dev, &async);
 856                 }
 857                 spin_unlock(&port->dev_list_lock);
 858         }
 859         spin_unlock_irq(&sas_ha->phy_port_lock);
 860
 861         async_synchronize_full_domain(&async);
 862
 863         sas_enable_revalidation(sas_ha);
 864 }
 865
 866 void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q)
 867 {
 868         struct scsi_cmnd *cmd, *n;
 869         struct domain_device *eh_dev;
 870
 871         do {
 872                 LIST_HEAD(sata_q);
 873                 eh_dev = NULL;
 874
 875                 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 876                         struct domain_device *ddev = cmd_to_domain_dev(cmd);
 877
 878                         if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
 879                                 continue;
 880                         if (eh_dev && eh_dev != ddev)
 881                                 continue;
 882                         eh_dev = ddev;
 883                         list_move(&cmd->eh_entry, &sata_q);
 884                 }
 885
 886                 if (!list_empty(&sata_q)) {
 887                         struct ata_port *ap = eh_dev->sata_dev.ap;
 888
 889                         sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
 890                         ata_scsi_cmd_error_handler(shost, ap, &sata_q);
 891                         /*
 892                          * ata's error handler may leave the cmd on the list
 893                          * so make sure they don't remain on a stack list
 894                          * about to go out of scope.
 895                          *
 896                          * This looks strange, since the commands are
 897                          * now part of no list, but the next error
 898                          * action will be ata_port_error_handler()
 899                          * which takes no list and sweeps them up
 900                          * anyway from the ata tag array.
 901                          */
 902                         while (!list_empty(&sata_q))
 903                                 list_del_init(sata_q.next);
 904                 }
 905         } while (eh_dev);
 906 }
 907
 908 void sas_ata_schedule_reset(struct domain_device *dev)
 909 {
 910         struct ata_eh_info *ehi;
 911         struct ata_port *ap;
 912         unsigned long flags;
 913
 914         if (!dev_is_sata(dev))
 915                 return;
 916
 917         ap = dev->sata_dev.ap;
 918         ehi = &ap->link.eh_info;
 919
 920         spin_lock_irqsave(ap->lock, flags);
 921         ehi->err_mask |= AC_ERR_TIMEOUT;
 922         ehi->action |= ATA_EH_RESET;
 923         ata_port_schedule_eh(ap);
 924         spin_unlock_irqrestore(ap->lock, flags);
 925 }
 926 EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
 927
 928 void sas_ata_wait_eh(struct domain_device *dev)
 929 {
 930         struct ata_port *ap;
 931
 932         if (!dev_is_sata(dev))
 933                 return;
 934
 935         ap = dev->sata_dev.ap;
 936         ata_port_wait_eh(ap);
 937 }
 938
 939 void sas_ata_device_link_abort(struct domain_device *device, bool force_reset)
 940 {
 941         struct ata_port *ap = device->sata_dev.ap;
 942         struct ata_link *link = &ap->link;
 943         unsigned long flags;
 944
 945         spin_lock_irqsave(ap->lock, flags);
 946         device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */
 947         device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */
 948
 949         link->eh_info.err_mask |= AC_ERR_DEV;
 950         if (force_reset)
 951                 link->eh_info.action |= ATA_EH_RESET;
 952         ata_link_abort(link);
 953         spin_unlock_irqrestore(ap->lock, flags);
 954 }
 955 EXPORT_SYMBOL_GPL(sas_ata_device_link_abort);
 956
 957 int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id)
 958 {
 959         struct sas_tmf_task tmf_task = {};
 960         return sas_execute_tmf(device, fis, sizeof(struct host_to_dev_fis),
 961                                force_phy_id, &tmf_task);
 962 }
 963 EXPORT_SYMBOL_GPL(sas_execute_ata_cmd);
 964
 965 static ssize_t sas_ncq_prio_supported_show(struct device *device,
 966                                            struct device_attribute *attr,
 967                                            char *buf)
 968 {
 969         struct scsi_device *sdev = to_scsi_device(device);
 970         struct domain_device *ddev = sdev_to_domain_dev(sdev);
 971         bool supported;
 972         int rc;
 973
 974         rc = ata_ncq_prio_supported(ddev->sata_dev.ap, sdev, &supported);
 975         if (rc)
 976                 return rc;
 977
 978         return sysfs_emit(buf, "%d\n", supported);
 979 }
 980
 981 static struct device_attribute dev_attr_sas_ncq_prio_supported =
 982         __ATTR(ncq_prio_supported, S_IRUGO, sas_ncq_prio_supported_show, NULL);
 983
 984 static ssize_t sas_ncq_prio_enable_show(struct device *device,
 985                                         struct device_attribute *attr,
 986                                         char *buf)
 987 {
 988         struct scsi_device *sdev = to_scsi_device(device);
 989         struct domain_device *ddev = sdev_to_domain_dev(sdev);
 990         bool enabled;
 991         int rc;
 992
 993         rc = ata_ncq_prio_enabled(ddev->sata_dev.ap, sdev, &enabled);
 994         if (rc)
 995                 return rc;
 996
 997         return sysfs_emit(buf, "%d\n", enabled);
 998 }
 999
1000 static ssize_t sas_ncq_prio_enable_store(struct device *device,
1001                                          struct device_attribute *attr,
1002                                          const char *buf, size_t len)
1003 {
1004         struct scsi_device *sdev = to_scsi_device(device);
1005         struct domain_device *ddev = sdev_to_domain_dev(sdev);
1006         bool enable;
1007         int rc;
1008
1009         rc = kstrtobool(buf, &enable);
1010         if (rc)
1011                 return rc;
1012
1013         rc = ata_ncq_prio_enable(ddev->sata_dev.ap, sdev, enable);
1014         if (rc)
1015                 return rc;
1016
1017         return len;
1018 }
1019
1020 static struct device_attribute dev_attr_sas_ncq_prio_enable =
1021         __ATTR(ncq_prio_enable, S_IRUGO | S_IWUSR,
1022                sas_ncq_prio_enable_show, sas_ncq_prio_enable_store);
1023
1024 static struct attribute *sas_ata_sdev_attrs[] = {
1025         &dev_attr_sas_ncq_prio_supported.attr,
1026         &dev_attr_sas_ncq_prio_enable.attr,
1027         NULL
1028 };
1029
1030 static umode_t sas_ata_attr_is_visible(struct kobject *kobj,
1031                                        struct attribute *attr, int i)
1032 {
1033         struct device *dev = kobj_to_dev(kobj);
1034         struct scsi_device *sdev = to_scsi_device(dev);
1035         struct domain_device *ddev = sdev_to_domain_dev(sdev);
1036
1037         if (!dev_is_sata(ddev))
1038                 return 0;
1039
1040         return attr->mode;
1041 }
1042
1043 const struct attribute_group sas_ata_sdev_attr_group = {
1044         .attrs = sas_ata_sdev_attrs,
1045         .is_visible = sas_ata_attr_is_visible,
1046 };
1047 EXPORT_SYMBOL_GPL(sas_ata_sdev_attr_group);