drivers/scsi/libsas/sas_ata.c

   1 /*
   2  * Support for SATA devices on Serial Attached SCSI (SAS) controllers
   3  *
   4  * Copyright (C) 2006 IBM Corporation
   5  *
   6  * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of the
  11  * License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21  * USA
  22  */
  23
  24 #include <linux/scatterlist.h>
  25 #include <linux/slab.h>
  26 #include <linux/async.h>
  27 #include <linux/export.h>
  28
  29 #include <scsi/sas_ata.h>
  30 #include "sas_internal.h"
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_device.h>
  33 #include <scsi/scsi_tcq.h>
  34 #include <scsi/scsi.h>
  35 #include <scsi/scsi_transport.h>
  36 #include <scsi/scsi_transport_sas.h>
  37 #include "../scsi_sas_internal.h"
  38 #include "../scsi_transport_api.h"
  39 #include <scsi/scsi_eh.h>
  40
  41 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
  42 {
  43         /* Cheesy attempt to translate SAS errors into ATA.  Hah! */
  44
  45         /* transport error */
  46         if (ts->resp == SAS_TASK_UNDELIVERED)
  47                 return AC_ERR_ATA_BUS;
  48
  49         /* ts->resp == SAS_TASK_COMPLETE */
  50         /* task delivered, what happened afterwards? */
  51         switch (ts->stat) {
  52                 case SAS_DEV_NO_RESPONSE:
  53                         return AC_ERR_TIMEOUT;
  54
  55                 case SAS_INTERRUPTED:
  56                 case SAS_PHY_DOWN:
  57                 case SAS_NAK_R_ERR:
  58                         return AC_ERR_ATA_BUS;
  59
  60
  61                 case SAS_DATA_UNDERRUN:
  62                         /*
  63                          * Some programs that use the taskfile interface
  64                          * (smartctl in particular) can cause underrun
  65                          * problems.  Ignore these errors, perhaps at our
  66                          * peril.
  67                          */
  68                         return 0;
  69
  70                 case SAS_DATA_OVERRUN:
  71                 case SAS_QUEUE_FULL:
  72                 case SAS_DEVICE_UNKNOWN:
  73                 case SAS_SG_ERR:
  74                         return AC_ERR_INVALID;
  75
  76                 case SAS_OPEN_TO:
  77                 case SAS_OPEN_REJECT:
  78                         SAS_DPRINTK("%s: Saw error %d.  What to do?\n",
  79                                     __func__, ts->stat);
  80                         return AC_ERR_OTHER;
  81
  82                 case SAM_STAT_CHECK_CONDITION:
  83                 case SAS_ABORTED_TASK:
  84                         return AC_ERR_DEV;
  85
  86                 case SAS_PROTO_RESPONSE:
  87                         /* This means the ending_fis has the error
  88                          * value; return 0 here to collect it */
  89                         return 0;
  90                 default:
  91                         return 0;
  92         }
  93 }
  94
  95 static void sas_ata_task_done(struct sas_task *task)
  96 {
  97         struct ata_queued_cmd *qc = task->uldd_task;
  98         struct domain_device *dev = task->dev;
  99         struct task_status_struct *stat = &task->task_status;
 100         struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
 101         struct sas_ha_struct *sas_ha = dev->port->ha;
 102         enum ata_completion_errors ac;
 103         unsigned long flags;
 104         struct ata_link *link;
 105         struct ata_port *ap;
 106
 107         spin_lock_irqsave(&dev->done_lock, flags);
 108         if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
 109                 task = NULL;
 110         else if (qc && qc->scsicmd)
 111                 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 112         spin_unlock_irqrestore(&dev->done_lock, flags);
 113
 114         /* check if libsas-eh got to the task before us */
 115         if (unlikely(!task))
 116                 return;
 117
 118         if (!qc)
 119                 goto qc_already_gone;
 120
 121         ap = qc->ap;
 122         link = &ap->link;
 123
 124         spin_lock_irqsave(ap->lock, flags);
 125         /* check if we lost the race with libata/sas_ata_post_internal() */
 126         if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) {
 127                 spin_unlock_irqrestore(ap->lock, flags);
 128                 if (qc->scsicmd)
 129                         goto qc_already_gone;
 130                 else {
 131                         /* if eh is not involved and the port is frozen then the
 132                          * ata internal abort process has taken responsibility
 133                          * for this sas_task
 134                          */
 135                         return;
 136                 }
 137         }
 138
 139         if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
 140             ((stat->stat == SAM_STAT_CHECK_CONDITION &&
 141               dev->sata_dev.command_set == ATAPI_COMMAND_SET))) {
 142                 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
 143
 144                 if (!link->sactive) {
 145                         qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
 146                 } else {
 147                         link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.tf.command);
 148                         if (unlikely(link->eh_info.err_mask))
 149                                 qc->flags |= ATA_QCFLAG_FAILED;
 150                 }
 151         } else {
 152                 ac = sas_to_ata_err(stat);
 153                 if (ac) {
 154                         SAS_DPRINTK("%s: SAS error %x\n", __func__,
 155                                     stat->stat);
 156                         /* We saw a SAS error. Send a vague error. */
 157                         if (!link->sactive) {
 158                                 qc->err_mask = ac;
 159                         } else {
 160                                 link->eh_info.err_mask |= AC_ERR_DEV;
 161                                 qc->flags |= ATA_QCFLAG_FAILED;
 162                         }
 163
 164                         dev->sata_dev.tf.feature = 0x04; /* status err */
 165                         dev->sata_dev.tf.command = ATA_ERR;
 166                 }
 167         }
 168
 169         qc->lldd_task = NULL;
 170         ata_qc_complete(qc);
 171         spin_unlock_irqrestore(ap->lock, flags);
 172
 173 qc_already_gone:
 174         list_del_init(&task->list);
 175         sas_free_task(task);
 176 }
 177
 178 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 179 {
 180         unsigned long flags;
 181         struct sas_task *task;
 182         struct scatterlist *sg;
 183         int ret = AC_ERR_SYSTEM;
 184         unsigned int si, xfer = 0;
 185         struct ata_port *ap = qc->ap;
 186         struct domain_device *dev = ap->private_data;
 187         struct sas_ha_struct *sas_ha = dev->port->ha;
 188         struct Scsi_Host *host = sas_ha->core.shost;
 189         struct sas_internal *i = to_sas_internal(host->transportt);
 190
 191         /* TODO: audit callers to ensure they are ready for qc_issue to
 192          * unconditionally re-enable interrupts
 193          */
 194         local_irq_save(flags);
 195         spin_unlock(ap->lock);
 196
 197         /* If the device fell off, no sense in issuing commands */
 198         if (test_bit(SAS_DEV_GONE, &dev->state))
 199                 goto out;
 200
 201         task = sas_alloc_task(GFP_ATOMIC);
 202         if (!task)
 203                 goto out;
 204         task->dev = dev;
 205         task->task_proto = SAS_PROTOCOL_STP;
 206         task->task_done = sas_ata_task_done;
 207
 208         if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
 209             qc->tf.command == ATA_CMD_FPDMA_READ) {
 210                 /* Need to zero out the tag libata assigned us */
 211                 qc->tf.nsect = 0;
 212         }
 213
 214         ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
 215         task->uldd_task = qc;
 216         if (ata_is_atapi(qc->tf.protocol)) {
 217                 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
 218                 task->total_xfer_len = qc->nbytes;
 219                 task->num_scatter = qc->n_elem;
 220         } else {
 221                 for_each_sg(qc->sg, sg, qc->n_elem, si)
 222                         xfer += sg->length;
 223
 224                 task->total_xfer_len = xfer;
 225                 task->num_scatter = si;
 226         }
 227
 228         task->data_dir = qc->dma_dir;
 229         task->scatter = qc->sg;
 230         task->ata_task.retry_count = 1;
 231         task->task_state_flags = SAS_TASK_STATE_PENDING;
 232         qc->lldd_task = task;
 233
 234         switch (qc->tf.protocol) {
 235         case ATA_PROT_NCQ:
 236                 task->ata_task.use_ncq = 1;
 237                 /* fall through */
 238         case ATAPI_PROT_DMA:
 239         case ATA_PROT_DMA:
 240                 task->ata_task.dma_xfer = 1;
 241                 break;
 242         }
 243
 244         if (qc->scsicmd)
 245                 ASSIGN_SAS_TASK(qc->scsicmd, task);
 246
 247         if (sas_ha->lldd_max_execute_num < 2)
 248                 ret = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 249         else
 250                 ret = sas_queue_up(task);
 251
 252         /* Examine */
 253         if (ret) {
 254                 SAS_DPRINTK("lldd_execute_task returned: %d\n", ret);
 255
 256                 if (qc->scsicmd)
 257                         ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 258                 sas_free_task(task);
 259                 ret = AC_ERR_SYSTEM;
 260         }
 261
 262  out:
 263         spin_lock(ap->lock);
 264         local_irq_restore(flags);
 265         return ret;
 266 }
 267
 268 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
 269 {
 270         struct domain_device *dev = qc->ap->private_data;
 271
 272         memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
 273         return true;
 274 }
 275
 276 static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
 277 {
 278         return to_sas_internal(dev->port->ha->core.shost->transportt);
 279 }
 280
 281 static void sas_get_ata_command_set(struct domain_device *dev);
 282
 283 int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
 284 {
 285         if (phy->attached_tproto & SAS_PROTOCOL_STP)
 286                 dev->tproto = phy->attached_tproto;
 287         if (phy->attached_sata_dev)
 288                 dev->tproto |= SATA_DEV;
 289
 290         if (phy->attached_dev_type == SATA_PENDING)
 291                 dev->dev_type = SATA_PENDING;
 292         else {
 293                 int res;
 294
 295                 dev->dev_type = SATA_DEV;
 296                 res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
 297                                               &dev->sata_dev.rps_resp);
 298                 if (res) {
 299                         SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
 300                                     "0x%x\n", SAS_ADDR(dev->parent->sas_addr),
 301                                     phy->phy_id, res);
 302                         return res;
 303                 }
 304                 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
 305                        sizeof(struct dev_to_host_fis));
 306                 /* TODO switch to ata_dev_classify() */
 307                 sas_get_ata_command_set(dev);
 308         }
 309         return 0;
 310 }
 311
 312 static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
 313 {
 314         int res;
 315
 316         /* we weren't pending, so successfully end the reset sequence now */
 317         if (dev->dev_type != SATA_PENDING)
 318                 return 1;
 319
 320         /* hmmm, if this succeeds do we need to repost the domain_device to the
 321          * lldd so it can pick up new parameters?
 322          */
 323         res = sas_get_ata_info(dev, phy);
 324         if (res)
 325                 return 0; /* retry */
 326         else
 327                 return 1;
 328 }
 329
 330 static int smp_ata_check_ready(struct ata_link *link)
 331 {
 332         int res;
 333         struct ata_port *ap = link->ap;
 334         struct domain_device *dev = ap->private_data;
 335         struct domain_device *ex_dev = dev->parent;
 336         struct sas_phy *phy = sas_get_local_phy(dev);
 337         struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
 338
 339         res = sas_ex_phy_discover(ex_dev, phy->number);
 340         sas_put_local_phy(phy);
 341
 342         /* break the wait early if the expander is unreachable,
 343          * otherwise keep polling
 344          */
 345         if (res == -ECOMM)
 346                 return res;
 347         if (res != SMP_RESP_FUNC_ACC)
 348                 return 0;
 349
 350         switch (ex_phy->attached_dev_type) {
 351         case SATA_PENDING:
 352                 return 0;
 353         case SAS_END_DEV:
 354                 if (ex_phy->attached_sata_dev)
 355                         return sas_ata_clear_pending(dev, ex_phy);
 356         default:
 357                 return -ENODEV;
 358         }
 359 }
 360
 361 static int local_ata_check_ready(struct ata_link *link)
 362 {
 363         struct ata_port *ap = link->ap;
 364         struct domain_device *dev = ap->private_data;
 365         struct sas_internal *i = dev_to_sas_internal(dev);
 366
 367         if (i->dft->lldd_ata_check_ready)
 368                 return i->dft->lldd_ata_check_ready(dev);
 369         else {
 370                 /* lldd's that don't implement 'ready' checking get the
 371                  * old default behavior of not coordinating reset
 372                  * recovery with libata
 373                  */
 374                 return 1;
 375         }
 376 }
 377
 378 static int sas_ata_printk(const char *level, const struct domain_device *ddev,
 379                           const char *fmt, ...)
 380 {
 381         struct ata_port *ap = ddev->sata_dev.ap;
 382         struct device *dev = &ddev->rphy->dev;
 383         struct va_format vaf;
 384         va_list args;
 385         int r;
 386
 387         va_start(args, fmt);
 388
 389         vaf.fmt = fmt;
 390         vaf.va = &args;
 391
 392         r = printk("%ssas: ata%u: %s: %pV",
 393                    level, ap->print_id, dev_name(dev), &vaf);
 394
 395         va_end(args);
 396
 397         return r;
 398 }
 399
 400 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
 401                               unsigned long deadline)
 402 {
 403         int ret = 0, res;
 404         struct sas_phy *phy;
 405         struct ata_port *ap = link->ap;
 406         int (*check_ready)(struct ata_link *link);
 407         struct domain_device *dev = ap->private_data;
 408         struct sas_internal *i = dev_to_sas_internal(dev);
 409
 410         res = i->dft->lldd_I_T_nexus_reset(dev);
 411         if (res == -ENODEV)
 412                 return res;
 413
 414         if (res != TMF_RESP_FUNC_COMPLETE)
 415                 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
 416
 417         phy = sas_get_local_phy(dev);
 418         if (scsi_is_sas_phy_local(phy))
 419                 check_ready = local_ata_check_ready;
 420         else
 421                 check_ready = smp_ata_check_ready;
 422         sas_put_local_phy(phy);
 423
 424         ret = ata_wait_after_reset(link, deadline, check_ready);
 425         if (ret && ret != -EAGAIN)
 426                 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
 427
 428         /* XXX: if the class changes during the reset the upper layer
 429          * should be informed, if the device has gone away we assume
 430          * libsas will eventually delete it
 431          */
 432         switch (dev->sata_dev.command_set) {
 433         case ATA_COMMAND_SET:
 434                 *class = ATA_DEV_ATA;
 435                 break;
 436         case ATAPI_COMMAND_SET:
 437                 *class = ATA_DEV_ATAPI;
 438                 break;
 439         }
 440
 441         ap->cbl = ATA_CBL_SATA;
 442         return ret;
 443 }
 444
 445 /*
 446  * notify the lldd to forget the sas_task for this internal ata command
 447  * that bypasses scsi-eh
 448  */
 449 static void sas_ata_internal_abort(struct sas_task *task)
 450 {
 451         struct sas_internal *si = dev_to_sas_internal(task->dev);
 452         unsigned long flags;
 453         int res;
 454
 455         spin_lock_irqsave(&task->task_state_lock, flags);
 456         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 457             task->task_state_flags & SAS_TASK_STATE_DONE) {
 458                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 459                 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
 460                             task);
 461                 goto out;
 462         }
 463         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 464         spin_unlock_irqrestore(&task->task_state_lock, flags);
 465
 466         res = si->dft->lldd_abort_task(task);
 467
 468         spin_lock_irqsave(&task->task_state_lock, flags);
 469         if (task->task_state_flags & SAS_TASK_STATE_DONE ||
 470             res == TMF_RESP_FUNC_COMPLETE) {
 471                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 472                 goto out;
 473         }
 474
 475         /* XXX we are not prepared to deal with ->lldd_abort_task()
 476          * failures.  TODO: lldds need to unconditionally forget about
 477          * aborted ata tasks, otherwise we (likely) leak the sas task
 478          * here
 479          */
 480         SAS_DPRINTK("%s: Task %p leaked.\n", __func__, task);
 481
 482         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 483                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 484         spin_unlock_irqrestore(&task->task_state_lock, flags);
 485
 486         return;
 487  out:
 488         list_del_init(&task->list);
 489         sas_free_task(task);
 490 }
 491
 492 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 493 {
 494         if (qc->flags & ATA_QCFLAG_FAILED)
 495                 qc->err_mask |= AC_ERR_OTHER;
 496
 497         if (qc->err_mask) {
 498                 /*
 499                  * Find the sas_task and kill it.  By this point, libata
 500                  * has decided to kill the qc and has frozen the port.
 501                  * In this state sas_ata_task_done() will no longer free
 502                  * the sas_task, so we need to notify the lldd (via
 503                  * ->lldd_abort_task) that the task is dead and free it
 504                  *  ourselves.
 505                  */
 506                 struct sas_task *task = qc->lldd_task;
 507
 508                 qc->lldd_task = NULL;
 509                 if (!task)
 510                         return;
 511                 task->uldd_task = NULL;
 512                 sas_ata_internal_abort(task);
 513         }
 514 }
 515
 516
 517 static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
 518 {
 519         struct domain_device *dev = ap->private_data;
 520         struct sas_internal *i = dev_to_sas_internal(dev);
 521
 522         if (i->dft->lldd_ata_set_dmamode)
 523                 i->dft->lldd_ata_set_dmamode(dev);
 524 }
 525
 526 static struct ata_port_operations sas_sata_ops = {
 527         .prereset               = ata_std_prereset,
 528         .hardreset              = sas_ata_hard_reset,
 529         .postreset              = ata_std_postreset,
 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 };
 540
 541 static struct ata_port_info sata_port_info = {
 542         .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
 543         .pio_mask = ATA_PIO4,
 544         .mwdma_mask = ATA_MWDMA2,
 545         .udma_mask = ATA_UDMA6,
 546         .port_ops = &sas_sata_ops
 547 };
 548
 549 int sas_ata_init_host_and_port(struct domain_device *found_dev)
 550 {
 551         struct sas_ha_struct *ha = found_dev->port->ha;
 552         struct Scsi_Host *shost = ha->core.shost;
 553         struct ata_port *ap;
 554
 555         ata_host_init(&found_dev->sata_dev.ata_host,
 556                       ha->dev,
 557                       sata_port_info.flags,
 558                       &sas_sata_ops);
 559         ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
 560                                 &sata_port_info,
 561                                 shost);
 562         if (!ap) {
 563                 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
 564                 return -ENODEV;
 565         }
 566
 567         ap->private_data = found_dev;
 568         ap->cbl = ATA_CBL_SATA;
 569         ap->scsi_host = shost;
 570         /* publish initialized ata port */
 571         smp_wmb();
 572         found_dev->sata_dev.ap = ap;
 573
 574         return 0;
 575 }
 576
 577 void sas_ata_task_abort(struct sas_task *task)
 578 {
 579         struct ata_queued_cmd *qc = task->uldd_task;
 580         struct completion *waiting;
 581
 582         /* Bounce SCSI-initiated commands to the SCSI EH */
 583         if (qc->scsicmd) {
 584                 struct request_queue *q = qc->scsicmd->device->request_queue;
 585                 unsigned long flags;
 586
 587                 spin_lock_irqsave(q->queue_lock, flags);
 588                 blk_abort_request(qc->scsicmd->request);
 589                 spin_unlock_irqrestore(q->queue_lock, flags);
 590                 scsi_schedule_eh(qc->scsicmd->device->host);
 591                 return;
 592         }
 593
 594         /* Internal command, fake a timeout and complete. */
 595         qc->flags &= ~ATA_QCFLAG_ACTIVE;
 596         qc->flags |= ATA_QCFLAG_FAILED;
 597         qc->err_mask |= AC_ERR_TIMEOUT;
 598         waiting = qc->private_data;
 599         complete(waiting);
 600 }
 601
 602 static void sas_get_ata_command_set(struct domain_device *dev)
 603 {
 604         struct dev_to_host_fis *fis =
 605                 (struct dev_to_host_fis *) dev->frame_rcvd;
 606
 607         if (dev->dev_type == SATA_PENDING)
 608                 return;
 609
 610         if ((fis->sector_count == 1 && /* ATA */
 611              fis->lbal         == 1 &&
 612              fis->lbam         == 0 &&
 613              fis->lbah         == 0 &&
 614              fis->device       == 0)
 615             ||
 616             (fis->sector_count == 0 && /* CE-ATA (mATA) */
 617              fis->lbal         == 0 &&
 618              fis->lbam         == 0xCE &&
 619              fis->lbah         == 0xAA &&
 620              (fis->device & ~0x10) == 0))
 621
 622                 dev->sata_dev.command_set = ATA_COMMAND_SET;
 623
 624         else if ((fis->interrupt_reason == 1 && /* ATAPI */
 625                   fis->lbal             == 1 &&
 626                   fis->byte_count_low   == 0x14 &&
 627                   fis->byte_count_high  == 0xEB &&
 628                   (fis->device & ~0x10) == 0))
 629
 630                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 631
 632         else if ((fis->sector_count == 1 && /* SEMB */
 633                   fis->lbal         == 1 &&
 634                   fis->lbam         == 0x3C &&
 635                   fis->lbah         == 0xC3 &&
 636                   fis->device       == 0)
 637                 ||
 638                  (fis->interrupt_reason == 1 && /* SATA PM */
 639                   fis->lbal             == 1 &&
 640                   fis->byte_count_low   == 0x69 &&
 641                   fis->byte_count_high  == 0x96 &&
 642                   (fis->device & ~0x10) == 0))
 643
 644                 /* Treat it as a superset? */
 645                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 646 }
 647
 648 void sas_probe_sata(struct asd_sas_port *port)
 649 {
 650         struct domain_device *dev, *n;
 651         int err;
 652
 653         mutex_lock(&port->ha->disco_mutex);
 654         list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
 655                 if (!dev_is_sata(dev))
 656                         continue;
 657
 658                 err = sas_ata_init_host_and_port(dev);
 659                 if (err)
 660                         sas_fail_probe(dev, __func__, err);
 661                 else
 662                         ata_sas_async_port_init(dev->sata_dev.ap);
 663         }
 664         mutex_unlock(&port->ha->disco_mutex);
 665
 666         list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
 667                 if (!dev_is_sata(dev))
 668                         continue;
 669
 670                 sas_ata_wait_eh(dev);
 671
 672                 /* if libata could not bring the link up, don't surface
 673                  * the device
 674                  */
 675                 if (ata_dev_disabled(sas_to_ata_dev(dev)))
 676                         sas_fail_probe(dev, __func__, -ENODEV);
 677         }
 678 }
 679
 680 /**
 681  * sas_discover_sata -- discover an STP/SATA domain device
 682  * @dev: pointer to struct domain_device of interest
 683  *
 684  * Devices directly attached to a HA port, have no parents.  All other
 685  * devices do, and should have their "parent" pointer set appropriately
 686  * before calling this function.
 687  */
 688 int sas_discover_sata(struct domain_device *dev)
 689 {
 690         int res;
 691
 692         if (dev->dev_type == SATA_PM)
 693                 return -ENODEV;
 694
 695         sas_get_ata_command_set(dev);
 696         sas_fill_in_rphy(dev, dev->rphy);
 697
 698         res = sas_notify_lldd_dev_found(dev);
 699         if (res)
 700                 return res;
 701
 702         sas_discover_event(dev->port, DISCE_PROBE);
 703         return 0;
 704 }
 705
 706 static void async_sas_ata_eh(void *data, async_cookie_t cookie)
 707 {
 708         struct domain_device *dev = data;
 709         struct ata_port *ap = dev->sata_dev.ap;
 710         struct sas_ha_struct *ha = dev->port->ha;
 711
 712         /* hold a reference over eh since we may be racing with final
 713          * remove once all commands are completed
 714          */
 715         kref_get(&dev->kref);
 716         sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
 717         ata_scsi_port_error_handler(ha->core.shost, ap);
 718         sas_put_device(dev);
 719 }
 720
 721 static bool sas_ata_dev_eh_valid(struct domain_device *dev)
 722 {
 723         struct ata_port *ap;
 724
 725         if (!dev_is_sata(dev))
 726                 return false;
 727         ap = dev->sata_dev.ap;
 728         /* consume fully initialized ata ports */
 729         smp_rmb();
 730         return !!ap;
 731 }
 732
 733 void sas_ata_strategy_handler(struct Scsi_Host *shost)
 734 {
 735         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 736         LIST_HEAD(async);
 737         int i;
 738
 739         /* it's ok to defer revalidation events during ata eh, these
 740          * disks are in one of three states:
 741          * 1/ present for initial domain discovery, and these
 742          *    resets will cause bcn flutters
 743          * 2/ hot removed, we'll discover that after eh fails
 744          * 3/ hot added after initial discovery, lost the race, and need
 745          *    to catch the next train.
 746          */
 747         sas_disable_revalidation(sas_ha);
 748
 749         spin_lock_irq(&sas_ha->phy_port_lock);
 750         for (i = 0; i < sas_ha->num_phys; i++) {
 751                 struct asd_sas_port *port = sas_ha->sas_port[i];
 752                 struct domain_device *dev;
 753
 754                 spin_lock(&port->dev_list_lock);
 755                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 756                         if (!sas_ata_dev_eh_valid(dev))
 757                                 continue;
 758                         async_schedule_domain(async_sas_ata_eh, dev, &async);
 759                 }
 760                 spin_unlock(&port->dev_list_lock);
 761         }
 762         spin_unlock_irq(&sas_ha->phy_port_lock);
 763
 764         async_synchronize_full_domain(&async);
 765
 766         sas_enable_revalidation(sas_ha);
 767 }
 768
 769 void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 770                 struct list_head *done_q)
 771 {
 772         struct scsi_cmnd *cmd, *n;
 773         struct domain_device *eh_dev;
 774
 775         do {
 776                 LIST_HEAD(sata_q);
 777                 eh_dev = NULL;
 778
 779                 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 780                         struct domain_device *ddev = cmd_to_domain_dev(cmd);
 781
 782                         if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
 783                                 continue;
 784                         if (eh_dev && eh_dev != ddev)
 785                                 continue;
 786                         eh_dev = ddev;
 787                         list_move(&cmd->eh_entry, &sata_q);
 788                 }
 789
 790                 if (!list_empty(&sata_q)) {
 791                         struct ata_port *ap = eh_dev->sata_dev.ap;
 792
 793                         sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
 794                         ata_scsi_cmd_error_handler(shost, ap, &sata_q);
 795                         /*
 796                          * ata's error handler may leave the cmd on the list
 797                          * so make sure they don't remain on a stack list
 798                          * about to go out of scope.
 799                          *
 800                          * This looks strange, since the commands are
 801                          * now part of no list, but the next error
 802                          * action will be ata_port_error_handler()
 803                          * which takes no list and sweeps them up
 804                          * anyway from the ata tag array.
 805                          */
 806                         while (!list_empty(&sata_q))
 807                                 list_del_init(sata_q.next);
 808                 }
 809         } while (eh_dev);
 810 }
 811
 812 void sas_ata_schedule_reset(struct domain_device *dev)
 813 {
 814         struct ata_eh_info *ehi;
 815         struct ata_port *ap;
 816         unsigned long flags;
 817
 818         if (!dev_is_sata(dev))
 819                 return;
 820
 821         ap = dev->sata_dev.ap;
 822         ehi = &ap->link.eh_info;
 823
 824         spin_lock_irqsave(ap->lock, flags);
 825         ehi->err_mask |= AC_ERR_TIMEOUT;
 826         ehi->action |= ATA_EH_RESET;
 827         ata_port_schedule_eh(ap);
 828         spin_unlock_irqrestore(ap->lock, flags);
 829 }
 830 EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
 831
 832 void sas_ata_wait_eh(struct domain_device *dev)
 833 {
 834         struct ata_port *ap;
 835
 836         if (!dev_is_sata(dev))
 837                 return;
 838
 839         ap = dev->sata_dev.ap;
 840         ata_port_wait_eh(ap);
 841 }