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