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.class == ATA_DEV_ATAPI))) {
 142                 memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE);
 143
 144                 if (!link->sactive) {
 145                         qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
 146                 } else {
 147                         link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
 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.fis[3] = 0x04; /* status err */
 165                         dev->sata_dev.fis[2] = 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         sas_free_task(task);
 175 }
 176
 177 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 178 {
 179         unsigned long flags;
 180         struct sas_task *task;
 181         struct scatterlist *sg;
 182         int ret = AC_ERR_SYSTEM;
 183         unsigned int si, xfer = 0;
 184         struct ata_port *ap = qc->ap;
 185         struct domain_device *dev = ap->private_data;
 186         struct sas_ha_struct *sas_ha = dev->port->ha;
 187         struct Scsi_Host *host = sas_ha->core.shost;
 188         struct sas_internal *i = to_sas_internal(host->transportt);
 189
 190         /* TODO: audit callers to ensure they are ready for qc_issue to
 191          * unconditionally re-enable interrupts
 192          */
 193         local_irq_save(flags);
 194         spin_unlock(ap->lock);
 195
 196         /* If the device fell off, no sense in issuing commands */
 197         if (test_bit(SAS_DEV_GONE, &dev->state))
 198                 goto out;
 199
 200         task = sas_alloc_task(GFP_ATOMIC);
 201         if (!task)
 202                 goto out;
 203         task->dev = dev;
 204         task->task_proto = SAS_PROTOCOL_STP;
 205         task->task_done = sas_ata_task_done;
 206
 207         if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
 208             qc->tf.command == ATA_CMD_FPDMA_READ ||
 209             qc->tf.command == ATA_CMD_FPDMA_RECV ||
 210             qc->tf.command == ATA_CMD_FPDMA_SEND ||
 211             qc->tf.command == ATA_CMD_NCQ_NON_DATA) {
 212                 /* Need to zero out the tag libata assigned us */
 213                 qc->tf.nsect = 0;
 214         }
 215
 216         ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
 217         task->uldd_task = qc;
 218         if (ata_is_atapi(qc->tf.protocol)) {
 219                 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
 220                 task->total_xfer_len = qc->nbytes;
 221                 task->num_scatter = qc->n_elem;
 222         } else {
 223                 for_each_sg(qc->sg, sg, qc->n_elem, si)
 224                         xfer += sg->length;
 225
 226                 task->total_xfer_len = xfer;
 227                 task->num_scatter = si;
 228         }
 229
 230         task->data_dir = qc->dma_dir;
 231         task->scatter = qc->sg;
 232         task->ata_task.retry_count = 1;
 233         task->task_state_flags = SAS_TASK_STATE_PENDING;
 234         qc->lldd_task = task;
 235
 236         switch (qc->tf.protocol) {
 237         case ATA_PROT_NCQ:
 238                 task->ata_task.use_ncq = 1;
 239                 /* fall through */
 240         case ATAPI_PROT_DMA:
 241         case ATA_PROT_DMA:
 242                 task->ata_task.dma_xfer = 1;
 243                 break;
 244         }
 245
 246         if (qc->scsicmd)
 247                 ASSIGN_SAS_TASK(qc->scsicmd, task);
 248
 249         ret = i->dft->lldd_execute_task(task, GFP_ATOMIC);
 250         if (ret) {
 251                 SAS_DPRINTK("lldd_execute_task returned: %d\n", ret);
 252
 253                 if (qc->scsicmd)
 254                         ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 255                 sas_free_task(task);
 256                 ret = AC_ERR_SYSTEM;
 257         }
 258
 259  out:
 260         spin_lock(ap->lock);
 261         local_irq_restore(flags);
 262         return ret;
 263 }
 264
 265 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
 266 {
 267         struct domain_device *dev = qc->ap->private_data;
 268
 269         ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
 270         return true;
 271 }
 272
 273 static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
 274 {
 275         return to_sas_internal(dev->port->ha->core.shost->transportt);
 276 }
 277
 278 static int sas_get_ata_command_set(struct domain_device *dev);
 279
 280 int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
 281 {
 282         if (phy->attached_tproto & SAS_PROTOCOL_STP)
 283                 dev->tproto = phy->attached_tproto;
 284         if (phy->attached_sata_dev)
 285                 dev->tproto |= SAS_SATA_DEV;
 286
 287         if (phy->attached_dev_type == SAS_SATA_PENDING)
 288                 dev->dev_type = SAS_SATA_PENDING;
 289         else {
 290                 int res;
 291
 292                 dev->dev_type = SAS_SATA_DEV;
 293                 res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
 294                                               &dev->sata_dev.rps_resp);
 295                 if (res) {
 296                         SAS_DPRINTK("report phy sata to %016llx:0x%x returned "
 297                                     "0x%x\n", SAS_ADDR(dev->parent->sas_addr),
 298                                     phy->phy_id, res);
 299                         return res;
 300                 }
 301                 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
 302                        sizeof(struct dev_to_host_fis));
 303                 dev->sata_dev.class = sas_get_ata_command_set(dev);
 304         }
 305         return 0;
 306 }
 307
 308 static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
 309 {
 310         int res;
 311
 312         /* we weren't pending, so successfully end the reset sequence now */
 313         if (dev->dev_type != SAS_SATA_PENDING)
 314                 return 1;
 315
 316         /* hmmm, if this succeeds do we need to repost the domain_device to the
 317          * lldd so it can pick up new parameters?
 318          */
 319         res = sas_get_ata_info(dev, phy);
 320         if (res)
 321                 return 0; /* retry */
 322         else
 323                 return 1;
 324 }
 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         default:
 353                 return -ENODEV;
 354         }
 355 }
 356
 357 static int local_ata_check_ready(struct ata_link *link)
 358 {
 359         struct ata_port *ap = link->ap;
 360         struct domain_device *dev = ap->private_data;
 361         struct sas_internal *i = dev_to_sas_internal(dev);
 362
 363         if (i->dft->lldd_ata_check_ready)
 364                 return i->dft->lldd_ata_check_ready(dev);
 365         else {
 366                 /* lldd's that don't implement 'ready' checking get the
 367                  * old default behavior of not coordinating reset
 368                  * recovery with libata
 369                  */
 370                 return 1;
 371         }
 372 }
 373
 374 static int sas_ata_printk(const char *level, const struct domain_device *ddev,
 375                           const char *fmt, ...)
 376 {
 377         struct ata_port *ap = ddev->sata_dev.ap;
 378         struct device *dev = &ddev->rphy->dev;
 379         struct va_format vaf;
 380         va_list args;
 381         int r;
 382
 383         va_start(args, fmt);
 384
 385         vaf.fmt = fmt;
 386         vaf.va = &args;
 387
 388         r = printk("%ssas: ata%u: %s: %pV",
 389                    level, ap->print_id, dev_name(dev), &vaf);
 390
 391         va_end(args);
 392
 393         return r;
 394 }
 395
 396 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
 397                               unsigned long deadline)
 398 {
 399         int ret = 0, res;
 400         struct sas_phy *phy;
 401         struct ata_port *ap = link->ap;
 402         int (*check_ready)(struct ata_link *link);
 403         struct domain_device *dev = ap->private_data;
 404         struct sas_internal *i = dev_to_sas_internal(dev);
 405
 406         res = i->dft->lldd_I_T_nexus_reset(dev);
 407         if (res == -ENODEV)
 408                 return res;
 409
 410         if (res != TMF_RESP_FUNC_COMPLETE)
 411                 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
 412
 413         phy = sas_get_local_phy(dev);
 414         if (scsi_is_sas_phy_local(phy))
 415                 check_ready = local_ata_check_ready;
 416         else
 417                 check_ready = smp_ata_check_ready;
 418         sas_put_local_phy(phy);
 419
 420         ret = ata_wait_after_reset(link, deadline, check_ready);
 421         if (ret && ret != -EAGAIN)
 422                 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
 423
 424         *class = dev->sata_dev.class;
 425
 426         ap->cbl = ATA_CBL_SATA;
 427         return ret;
 428 }
 429
 430 /*
 431  * notify the lldd to forget the sas_task for this internal ata command
 432  * that bypasses scsi-eh
 433  */
 434 static void sas_ata_internal_abort(struct sas_task *task)
 435 {
 436         struct sas_internal *si = dev_to_sas_internal(task->dev);
 437         unsigned long flags;
 438         int res;
 439
 440         spin_lock_irqsave(&task->task_state_lock, flags);
 441         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 442             task->task_state_flags & SAS_TASK_STATE_DONE) {
 443                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 444                 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
 445                             task);
 446                 goto out;
 447         }
 448         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 449         spin_unlock_irqrestore(&task->task_state_lock, flags);
 450
 451         res = si->dft->lldd_abort_task(task);
 452
 453         spin_lock_irqsave(&task->task_state_lock, flags);
 454         if (task->task_state_flags & SAS_TASK_STATE_DONE ||
 455             res == TMF_RESP_FUNC_COMPLETE) {
 456                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 457                 goto out;
 458         }
 459
 460         /* XXX we are not prepared to deal with ->lldd_abort_task()
 461          * failures.  TODO: lldds need to unconditionally forget about
 462          * aborted ata tasks, otherwise we (likely) leak the sas task
 463          * here
 464          */
 465         SAS_DPRINTK("%s: Task %p leaked.\n", __func__, task);
 466
 467         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 468                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 469         spin_unlock_irqrestore(&task->task_state_lock, flags);
 470
 471         return;
 472  out:
 473         sas_free_task(task);
 474 }
 475
 476 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 477 {
 478         if (qc->flags & ATA_QCFLAG_FAILED)
 479                 qc->err_mask |= AC_ERR_OTHER;
 480
 481         if (qc->err_mask) {
 482                 /*
 483                  * Find the sas_task and kill it.  By this point, libata
 484                  * has decided to kill the qc and has frozen the port.
 485                  * In this state sas_ata_task_done() will no longer free
 486                  * the sas_task, so we need to notify the lldd (via
 487                  * ->lldd_abort_task) that the task is dead and free it
 488                  *  ourselves.
 489                  */
 490                 struct sas_task *task = qc->lldd_task;
 491
 492                 qc->lldd_task = NULL;
 493                 if (!task)
 494                         return;
 495                 task->uldd_task = NULL;
 496                 sas_ata_internal_abort(task);
 497         }
 498 }
 499
 500
 501 static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
 502 {
 503         struct domain_device *dev = ap->private_data;
 504         struct sas_internal *i = dev_to_sas_internal(dev);
 505
 506         if (i->dft->lldd_ata_set_dmamode)
 507                 i->dft->lldd_ata_set_dmamode(dev);
 508 }
 509
 510 static void sas_ata_sched_eh(struct ata_port *ap)
 511 {
 512         struct domain_device *dev = ap->private_data;
 513         struct sas_ha_struct *ha = dev->port->ha;
 514         unsigned long flags;
 515
 516         spin_lock_irqsave(&ha->lock, flags);
 517         if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state))
 518                 ha->eh_active++;
 519         ata_std_sched_eh(ap);
 520         spin_unlock_irqrestore(&ha->lock, flags);
 521 }
 522
 523 void sas_ata_end_eh(struct ata_port *ap)
 524 {
 525         struct domain_device *dev = ap->private_data;
 526         struct sas_ha_struct *ha = dev->port->ha;
 527         unsigned long flags;
 528
 529         spin_lock_irqsave(&ha->lock, flags);
 530         if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state))
 531                 ha->eh_active--;
 532         spin_unlock_irqrestore(&ha->lock, flags);
 533 }
 534
 535 static struct ata_port_operations sas_sata_ops = {
 536         .prereset               = ata_std_prereset,
 537         .hardreset              = sas_ata_hard_reset,
 538         .postreset              = ata_std_postreset,
 539         .error_handler          = ata_std_error_handler,
 540         .post_internal_cmd      = sas_ata_post_internal,
 541         .qc_defer               = ata_std_qc_defer,
 542         .qc_prep                = ata_noop_qc_prep,
 543         .qc_issue               = sas_ata_qc_issue,
 544         .qc_fill_rtf            = sas_ata_qc_fill_rtf,
 545         .port_start             = ata_sas_port_start,
 546         .port_stop              = ata_sas_port_stop,
 547         .set_dmamode            = sas_ata_set_dmamode,
 548         .sched_eh               = sas_ata_sched_eh,
 549         .end_eh                 = sas_ata_end_eh,
 550 };
 551
 552 static struct ata_port_info sata_port_info = {
 553         .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
 554                  ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX,
 555         .pio_mask = ATA_PIO4,
 556         .mwdma_mask = ATA_MWDMA2,
 557         .udma_mask = ATA_UDMA6,
 558         .port_ops = &sas_sata_ops
 559 };
 560
 561 int sas_ata_init(struct domain_device *found_dev)
 562 {
 563         struct sas_ha_struct *ha = found_dev->port->ha;
 564         struct Scsi_Host *shost = ha->core.shost;
 565         struct ata_port *ap;
 566         int rc;
 567
 568         ata_host_init(&found_dev->sata_dev.ata_host, ha->dev, &sas_sata_ops);
 569         ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
 570                                 &sata_port_info,
 571                                 shost);
 572         if (!ap) {
 573                 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
 574                 return -ENODEV;
 575         }
 576
 577         ap->private_data = found_dev;
 578         ap->cbl = ATA_CBL_SATA;
 579         ap->scsi_host = shost;
 580         rc = ata_sas_port_init(ap);
 581         if (rc) {
 582                 ata_sas_port_destroy(ap);
 583                 return rc;
 584         }
 585         found_dev->sata_dev.ap = ap;
 586
 587         return 0;
 588 }
 589
 590 void sas_ata_task_abort(struct sas_task *task)
 591 {
 592         struct ata_queued_cmd *qc = task->uldd_task;
 593         struct completion *waiting;
 594
 595         /* Bounce SCSI-initiated commands to the SCSI EH */
 596         if (qc->scsicmd) {
 597                 struct request_queue *q = qc->scsicmd->device->request_queue;
 598                 unsigned long flags;
 599
 600                 spin_lock_irqsave(q->queue_lock, flags);
 601                 blk_abort_request(qc->scsicmd->request);
 602                 spin_unlock_irqrestore(q->queue_lock, flags);
 603                 return;
 604         }
 605
 606         /* Internal command, fake a timeout and complete. */
 607         qc->flags &= ~ATA_QCFLAG_ACTIVE;
 608         qc->flags |= ATA_QCFLAG_FAILED;
 609         qc->err_mask |= AC_ERR_TIMEOUT;
 610         waiting = qc->private_data;
 611         complete(waiting);
 612 }
 613
 614 static int sas_get_ata_command_set(struct domain_device *dev)
 615 {
 616         struct dev_to_host_fis *fis =
 617                 (struct dev_to_host_fis *) dev->frame_rcvd;
 618         struct ata_taskfile tf;
 619
 620         if (dev->dev_type == SAS_SATA_PENDING)
 621                 return ATA_DEV_UNKNOWN;
 622
 623         ata_tf_from_fis((const u8 *)fis, &tf);
 624
 625         return ata_dev_classify(&tf);
 626 }
 627
 628 void sas_probe_sata(struct asd_sas_port *port)
 629 {
 630         struct domain_device *dev, *n;
 631
 632         mutex_lock(&port->ha->disco_mutex);
 633         list_for_each_entry(dev, &port->disco_list, disco_list_node) {
 634                 if (!dev_is_sata(dev))
 635                         continue;
 636
 637                 ata_sas_async_probe(dev->sata_dev.ap);
 638         }
 639         mutex_unlock(&port->ha->disco_mutex);
 640
 641         list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
 642                 if (!dev_is_sata(dev))
 643                         continue;
 644
 645                 sas_ata_wait_eh(dev);
 646
 647                 /* if libata could not bring the link up, don't surface
 648                  * the device
 649                  */
 650                 if (ata_dev_disabled(sas_to_ata_dev(dev)))
 651                         sas_fail_probe(dev, __func__, -ENODEV);
 652         }
 653
 654 }
 655
 656 static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func)
 657 {
 658         struct domain_device *dev, *n;
 659
 660         list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) {
 661                 if (!dev_is_sata(dev))
 662                         continue;
 663
 664                 sas_ata_wait_eh(dev);
 665
 666                 /* if libata failed to power manage the device, tear it down */
 667                 if (ata_dev_disabled(sas_to_ata_dev(dev)))
 668                         sas_fail_probe(dev, func, -ENODEV);
 669         }
 670 }
 671
 672 void sas_suspend_sata(struct asd_sas_port *port)
 673 {
 674         struct domain_device *dev;
 675
 676         mutex_lock(&port->ha->disco_mutex);
 677         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 678                 struct sata_device *sata;
 679
 680                 if (!dev_is_sata(dev))
 681                         continue;
 682
 683                 sata = &dev->sata_dev;
 684                 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND)
 685                         continue;
 686
 687                 ata_sas_port_suspend(sata->ap);
 688         }
 689         mutex_unlock(&port->ha->disco_mutex);
 690
 691         sas_ata_flush_pm_eh(port, __func__);
 692 }
 693
 694 void sas_resume_sata(struct asd_sas_port *port)
 695 {
 696         struct domain_device *dev;
 697
 698         mutex_lock(&port->ha->disco_mutex);
 699         list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 700                 struct sata_device *sata;
 701
 702                 if (!dev_is_sata(dev))
 703                         continue;
 704
 705                 sata = &dev->sata_dev;
 706                 if (sata->ap->pm_mesg.event == PM_EVENT_ON)
 707                         continue;
 708
 709                 ata_sas_port_resume(sata->ap);
 710         }
 711         mutex_unlock(&port->ha->disco_mutex);
 712
 713         sas_ata_flush_pm_eh(port, __func__);
 714 }
 715
 716 /**
 717  * sas_discover_sata -- discover an STP/SATA domain device
 718  * @dev: pointer to struct domain_device of interest
 719  *
 720  * Devices directly attached to a HA port, have no parents.  All other
 721  * devices do, and should have their "parent" pointer set appropriately
 722  * before calling this function.
 723  */
 724 int sas_discover_sata(struct domain_device *dev)
 725 {
 726         int res;
 727
 728         if (dev->dev_type == SAS_SATA_PM)
 729                 return -ENODEV;
 730
 731         dev->sata_dev.class = sas_get_ata_command_set(dev);
 732         sas_fill_in_rphy(dev, dev->rphy);
 733
 734         res = sas_notify_lldd_dev_found(dev);
 735         if (res)
 736                 return res;
 737
 738         sas_discover_event(dev->port, DISCE_PROBE);
 739         return 0;
 740 }
 741
 742 static void async_sas_ata_eh(void *data, async_cookie_t cookie)
 743 {
 744         struct domain_device *dev = data;
 745         struct ata_port *ap = dev->sata_dev.ap;
 746         struct sas_ha_struct *ha = dev->port->ha;
 747
 748         sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
 749         ata_scsi_port_error_handler(ha->core.shost, ap);
 750         sas_put_device(dev);
 751 }
 752
 753 void sas_ata_strategy_handler(struct Scsi_Host *shost)
 754 {
 755         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 756         ASYNC_DOMAIN_EXCLUSIVE(async);
 757         int i;
 758
 759         /* it's ok to defer revalidation events during ata eh, these
 760          * disks are in one of three states:
 761          * 1/ present for initial domain discovery, and these
 762          *    resets will cause bcn flutters
 763          * 2/ hot removed, we'll discover that after eh fails
 764          * 3/ hot added after initial discovery, lost the race, and need
 765          *    to catch the next train.
 766          */
 767         sas_disable_revalidation(sas_ha);
 768
 769         spin_lock_irq(&sas_ha->phy_port_lock);
 770         for (i = 0; i < sas_ha->num_phys; i++) {
 771                 struct asd_sas_port *port = sas_ha->sas_port[i];
 772                 struct domain_device *dev;
 773
 774                 spin_lock(&port->dev_list_lock);
 775                 list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 776                         if (!dev_is_sata(dev))
 777                                 continue;
 778
 779                         /* hold a reference over eh since we may be
 780                          * racing with final remove once all commands
 781                          * are completed
 782                          */
 783                         kref_get(&dev->kref);
 784
 785                         async_schedule_domain(async_sas_ata_eh, dev, &async);
 786                 }
 787                 spin_unlock(&port->dev_list_lock);
 788         }
 789         spin_unlock_irq(&sas_ha->phy_port_lock);
 790
 791         async_synchronize_full_domain(&async);
 792
 793         sas_enable_revalidation(sas_ha);
 794 }
 795
 796 void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 797                 struct list_head *done_q)
 798 {
 799         struct scsi_cmnd *cmd, *n;
 800         struct domain_device *eh_dev;
 801
 802         do {
 803                 LIST_HEAD(sata_q);
 804                 eh_dev = NULL;
 805
 806                 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 807                         struct domain_device *ddev = cmd_to_domain_dev(cmd);
 808
 809                         if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
 810                                 continue;
 811                         if (eh_dev && eh_dev != ddev)
 812                                 continue;
 813                         eh_dev = ddev;
 814                         list_move(&cmd->eh_entry, &sata_q);
 815                 }
 816
 817                 if (!list_empty(&sata_q)) {
 818                         struct ata_port *ap = eh_dev->sata_dev.ap;
 819
 820                         sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
 821                         ata_scsi_cmd_error_handler(shost, ap, &sata_q);
 822                         /*
 823                          * ata's error handler may leave the cmd on the list
 824                          * so make sure they don't remain on a stack list
 825                          * about to go out of scope.
 826                          *
 827                          * This looks strange, since the commands are
 828                          * now part of no list, but the next error
 829                          * action will be ata_port_error_handler()
 830                          * which takes no list and sweeps them up
 831                          * anyway from the ata tag array.
 832                          */
 833                         while (!list_empty(&sata_q))
 834                                 list_del_init(sata_q.next);
 835                 }
 836         } while (eh_dev);
 837 }
 838
 839 void sas_ata_schedule_reset(struct domain_device *dev)
 840 {
 841         struct ata_eh_info *ehi;
 842         struct ata_port *ap;
 843         unsigned long flags;
 844
 845         if (!dev_is_sata(dev))
 846                 return;
 847
 848         ap = dev->sata_dev.ap;
 849         ehi = &ap->link.eh_info;
 850
 851         spin_lock_irqsave(ap->lock, flags);
 852         ehi->err_mask |= AC_ERR_TIMEOUT;
 853         ehi->action |= ATA_EH_RESET;
 854         ata_port_schedule_eh(ap);
 855         spin_unlock_irqrestore(ap->lock, flags);
 856 }
 857 EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
 858
 859 void sas_ata_wait_eh(struct domain_device *dev)
 860 {
 861         struct ata_port *ap;
 862
 863         if (!dev_is_sata(dev))
 864                 return;
 865
 866         ap = dev->sata_dev.ap;
 867         ata_port_wait_eh(ap);
 868 }