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