drivers/scsi/libsas/sas_ata.c

   1 /*
   2  * Support for SATA devices on Serial Attached SCSI (SAS) controllers
   3  *
   4  * Copyright (C) 2006 IBM Corporation
   5  *
   6  * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of the
  11  * License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21  * USA
  22  */
  23
  24 #include <linux/scatterlist.h>
  25 #include <linux/slab.h>
  26 #include <linux/async.h>
  27 #include <linux/export.h>
  28
  29 #include <scsi/sas_ata.h>
  30 #include "sas_internal.h"
  31 #include <scsi/scsi_host.h>
  32 #include <scsi/scsi_device.h>
  33 #include <scsi/scsi_tcq.h>
  34 #include <scsi/scsi.h>
  35 #include <scsi/scsi_transport.h>
  36 #include <scsi/scsi_transport_sas.h>
  37 #include "../scsi_sas_internal.h"
  38 #include "../scsi_transport_api.h"
  39 #include <scsi/scsi_eh.h>
  40
  41 static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
  42 {
  43         /* Cheesy attempt to translate SAS errors into ATA.  Hah! */
  44
  45         /* transport error */
  46         if (ts->resp == SAS_TASK_UNDELIVERED)
  47                 return AC_ERR_ATA_BUS;
  48
  49         /* ts->resp == SAS_TASK_COMPLETE */
  50         /* task delivered, what happened afterwards? */
  51         switch (ts->stat) {
  52                 case SAS_DEV_NO_RESPONSE:
  53                         return AC_ERR_TIMEOUT;
  54
  55                 case SAS_INTERRUPTED:
  56                 case SAS_PHY_DOWN:
  57                 case SAS_NAK_R_ERR:
  58                         return AC_ERR_ATA_BUS;
  59
  60
  61                 case SAS_DATA_UNDERRUN:
  62                         /*
  63                          * Some programs that use the taskfile interface
  64                          * (smartctl in particular) can cause underrun
  65                          * problems.  Ignore these errors, perhaps at our
  66                          * peril.
  67                          */
  68                         return 0;
  69
  70                 case SAS_DATA_OVERRUN:
  71                 case SAS_QUEUE_FULL:
  72                 case SAS_DEVICE_UNKNOWN:
  73                 case SAS_SG_ERR:
  74                         return AC_ERR_INVALID;
  75
  76                 case SAS_OPEN_TO:
  77                 case SAS_OPEN_REJECT:
  78                         SAS_DPRINTK("%s: Saw error %d.  What to do?\n",
  79                                     __func__, ts->stat);
  80                         return AC_ERR_OTHER;
  81
  82                 case SAM_STAT_CHECK_CONDITION:
  83                 case SAS_ABORTED_TASK:
  84                         return AC_ERR_DEV;
  85
  86                 case SAS_PROTO_RESPONSE:
  87                         /* This means the ending_fis has the error
  88                          * value; return 0 here to collect it */
  89                         return 0;
  90                 default:
  91                         return 0;
  92         }
  93 }
  94
  95 static void sas_ata_task_done(struct sas_task *task)
  96 {
  97         struct ata_queued_cmd *qc = task->uldd_task;
  98         struct domain_device *dev = task->dev;
  99         struct task_status_struct *stat = &task->task_status;
 100         struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
 101         struct sas_ha_struct *sas_ha = dev->port->ha;
 102         enum ata_completion_errors ac;
 103         unsigned long flags;
 104         struct ata_link *link;
 105         struct ata_port *ap;
 106
 107         spin_lock_irqsave(&dev->done_lock, flags);
 108         if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
 109                 task = NULL;
 110         else if (qc && qc->scsicmd)
 111                 ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 112         spin_unlock_irqrestore(&dev->done_lock, flags);
 113
 114         /* check if libsas-eh got to the task before us */
 115         if (unlikely(!task))
 116                 return;
 117
 118         if (!qc)
 119                 goto qc_already_gone;
 120
 121         ap = qc->ap;
 122         link = &ap->link;
 123
 124         spin_lock_irqsave(ap->lock, flags);
 125         /* check if we lost the race with libata/sas_ata_post_internal() */
 126         if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) {
 127                 spin_unlock_irqrestore(ap->lock, flags);
 128                 if (qc->scsicmd)
 129                         goto qc_already_gone;
 130                 else {
 131                         /* if eh is not involved and the port is frozen then the
 132                          * ata internal abort process has taken responsibility
 133                          * for this sas_task
 134                          */
 135                         return;
 136                 }
 137         }
 138
 139         if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
 140             ((stat->stat == SAM_STAT_CHECK_CONDITION &&
 141               dev->sata_dev.command_set == ATAPI_COMMAND_SET))) {
 142                 ata_tf_from_fis(resp->ending_fis, &dev->sata_dev.tf);
 143
 144                 if (!link->sactive) {
 145                         qc->err_mask |= ac_err_mask(dev->sata_dev.tf.command);
 146                 } else {
 147                         link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.tf.command);
 148                         if (unlikely(link->eh_info.err_mask))
 149                                 qc->flags |= ATA_QCFLAG_FAILED;
 150                 }
 151         } else {
 152                 ac = sas_to_ata_err(stat);
 153                 if (ac) {
 154                         SAS_DPRINTK("%s: SAS error %x\n", __func__,
 155                                     stat->stat);
 156                         /* We saw a SAS error. Send a vague error. */
 157                         if (!link->sactive) {
 158                                 qc->err_mask = ac;
 159                         } else {
 160                                 link->eh_info.err_mask |= AC_ERR_DEV;
 161                                 qc->flags |= ATA_QCFLAG_FAILED;
 162                         }
 163
 164                         dev->sata_dev.tf.feature = 0x04; /* status err */
 165                         dev->sata_dev.tf.command = ATA_ERR;
 166                 }
 167         }
 168
 169         qc->lldd_task = NULL;
 170         ata_qc_complete(qc);
 171         spin_unlock_irqrestore(ap->lock, flags);
 172
 173 qc_already_gone:
 174         list_del_init(&task->list);
 175         sas_free_task(task);
 176 }
 177
 178 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 179 {
 180         unsigned long flags;
 181         struct sas_task *task;
 182         struct scatterlist *sg;
 183         int ret = AC_ERR_SYSTEM;
 184         unsigned int si, xfer = 0;
 185         struct ata_port *ap = qc->ap;
 186         struct domain_device *dev = ap->private_data;
 187         struct sas_ha_struct *sas_ha = dev->port->ha;
 188         struct Scsi_Host *host = sas_ha->core.shost;
 189         struct sas_internal *i = to_sas_internal(host->transportt);
 190
 191         /* TODO: audit callers to ensure they are ready for qc_issue to
 192          * unconditionally re-enable interrupts
 193          */
 194         local_irq_save(flags);
 195         spin_unlock(ap->lock);
 196
 197         /* If the device fell off, no sense in issuing commands */
 198         if (test_bit(SAS_DEV_GONE, &dev->state))
 199                 goto out;
 200
 201         task = sas_alloc_task(GFP_ATOMIC);
 202         if (!task)
 203                 goto out;
 204         task->dev = dev;
 205         task->task_proto = SAS_PROTOCOL_STP;
 206         task->task_done = sas_ata_task_done;
 207
 208         if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
 209             qc->tf.command == ATA_CMD_FPDMA_READ) {
 210                 /* Need to zero out the tag libata assigned us */
 211                 qc->tf.nsect = 0;
 212         }
 213
 214         ata_tf_to_fis(&qc->tf, 1, 0, (u8*)&task->ata_task.fis);
 215         task->uldd_task = qc;
 216         if (ata_is_atapi(qc->tf.protocol)) {
 217                 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
 218                 task->total_xfer_len = qc->nbytes;
 219                 task->num_scatter = qc->n_elem;
 220         } else {
 221                 for_each_sg(qc->sg, sg, qc->n_elem, si)
 222                         xfer += sg->length;
 223
 224                 task->total_xfer_len = xfer;
 225                 task->num_scatter = si;
 226         }
 227
 228         task->data_dir = qc->dma_dir;
 229         task->scatter = qc->sg;
 230         task->ata_task.retry_count = 1;
 231         task->task_state_flags = SAS_TASK_STATE_PENDING;
 232         qc->lldd_task = task;
 233
 234         switch (qc->tf.protocol) {
 235         case ATA_PROT_NCQ:
 236                 task->ata_task.use_ncq = 1;
 237                 /* fall through */
 238         case ATAPI_PROT_DMA:
 239         case ATA_PROT_DMA:
 240                 task->ata_task.dma_xfer = 1;
 241                 break;
 242         }
 243
 244         if (qc->scsicmd)
 245                 ASSIGN_SAS_TASK(qc->scsicmd, task);
 246
 247         if (sas_ha->lldd_max_execute_num < 2)
 248                 ret = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC);
 249         else
 250                 ret = sas_queue_up(task);
 251
 252         /* Examine */
 253         if (ret) {
 254                 SAS_DPRINTK("lldd_execute_task returned: %d\n", ret);
 255
 256                 if (qc->scsicmd)
 257                         ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 258                 sas_free_task(task);
 259                 ret = AC_ERR_SYSTEM;
 260         }
 261
 262  out:
 263         spin_lock(ap->lock);
 264         local_irq_restore(flags);
 265         return ret;
 266 }
 267
 268 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
 269 {
 270         struct domain_device *dev = qc->ap->private_data;
 271
 272         memcpy(&qc->result_tf, &dev->sata_dev.tf, sizeof(qc->result_tf));
 273         return true;
 274 }
 275
 276 static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
 277 {
 278         return to_sas_internal(dev->port->ha->core.shost->transportt);
 279 }
 280
 281 static int smp_ata_check_ready(struct ata_link *link)
 282 {
 283         int res;
 284         u8 addr[8];
 285         struct ata_port *ap = link->ap;
 286         struct domain_device *dev = ap->private_data;
 287         struct domain_device *ex_dev = dev->parent;
 288         struct sas_phy *phy = sas_get_local_phy(dev);
 289
 290         res = sas_get_phy_attached_sas_addr(ex_dev, phy->number, addr);
 291         sas_put_local_phy(phy);
 292         /* break the wait early if the expander is unreachable,
 293          * otherwise keep polling
 294          */
 295         if (res == -ECOMM)
 296                 return res;
 297         if (res != SMP_RESP_FUNC_ACC || SAS_ADDR(addr) == 0)
 298                 return 0;
 299         else
 300                 return 1;
 301 }
 302
 303 static int local_ata_check_ready(struct ata_link *link)
 304 {
 305         struct ata_port *ap = link->ap;
 306         struct domain_device *dev = ap->private_data;
 307         struct sas_internal *i = dev_to_sas_internal(dev);
 308
 309         if (i->dft->lldd_ata_check_ready)
 310                 return i->dft->lldd_ata_check_ready(dev);
 311         else {
 312                 /* lldd's that don't implement 'ready' checking get the
 313                  * old default behavior of not coordinating reset
 314                  * recovery with libata
 315                  */
 316                 return 1;
 317         }
 318 }
 319
 320 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
 321                               unsigned long deadline)
 322 {
 323         int ret = 0, res;
 324         struct sas_phy *phy;
 325         struct ata_port *ap = link->ap;
 326         int (*check_ready)(struct ata_link *link);
 327         struct domain_device *dev = ap->private_data;
 328         struct sas_internal *i = dev_to_sas_internal(dev);
 329
 330         if (test_bit(SAS_DEV_GONE, &dev->state))
 331                 return -ENODEV;
 332
 333         res = i->dft->lldd_I_T_nexus_reset(dev);
 334
 335         if (res != TMF_RESP_FUNC_COMPLETE)
 336                 SAS_DPRINTK("%s: Unable to reset ata device?\n", __func__);
 337
 338         phy = sas_get_local_phy(dev);
 339         if (scsi_is_sas_phy_local(phy))
 340                 check_ready = local_ata_check_ready;
 341         else
 342                 check_ready = smp_ata_check_ready;
 343         sas_put_local_phy(phy);
 344
 345         ret = ata_wait_after_reset(link, deadline, check_ready);
 346         if (ret && ret != -EAGAIN)
 347                 ata_link_err(link, "COMRESET failed (errno=%d)\n", ret);
 348
 349         /* XXX: if the class changes during the reset the upper layer
 350          * should be informed, if the device has gone away we assume
 351          * libsas will eventually delete it
 352          */
 353         switch (dev->sata_dev.command_set) {
 354         case ATA_COMMAND_SET:
 355                 *class = ATA_DEV_ATA;
 356                 break;
 357         case ATAPI_COMMAND_SET:
 358                 *class = ATA_DEV_ATAPI;
 359                 break;
 360         }
 361
 362         ap->cbl = ATA_CBL_SATA;
 363         return ret;
 364 }
 365
 366 static int sas_ata_soft_reset(struct ata_link *link, unsigned int *class,
 367                                unsigned long deadline)
 368 {
 369         struct ata_port *ap = link->ap;
 370         struct domain_device *dev = ap->private_data;
 371         struct sas_internal *i = dev_to_sas_internal(dev);
 372         int res = TMF_RESP_FUNC_FAILED;
 373         int ret = 0;
 374
 375         if (i->dft->lldd_ata_soft_reset)
 376                 res = i->dft->lldd_ata_soft_reset(dev);
 377
 378         if (res != TMF_RESP_FUNC_COMPLETE) {
 379                 SAS_DPRINTK("%s: Unable to soft reset\n", __func__);
 380                 ret = -EAGAIN;
 381         }
 382
 383         switch (dev->sata_dev.command_set) {
 384         case ATA_COMMAND_SET:
 385                 SAS_DPRINTK("%s: Found ATA device.\n", __func__);
 386                 *class = ATA_DEV_ATA;
 387                 break;
 388         case ATAPI_COMMAND_SET:
 389                 SAS_DPRINTK("%s: Found ATAPI device.\n", __func__);
 390                 *class = ATA_DEV_ATAPI;
 391                 break;
 392         default:
 393                 SAS_DPRINTK("%s: Unknown SATA command set: %d.\n",
 394                             __func__, dev->sata_dev.command_set);
 395                 *class = ATA_DEV_UNKNOWN;
 396                 break;
 397         }
 398
 399         ap->cbl = ATA_CBL_SATA;
 400         return ret;
 401 }
 402
 403 /*
 404  * notify the lldd to forget the sas_task for this internal ata command
 405  * that bypasses scsi-eh
 406  */
 407 static void sas_ata_internal_abort(struct sas_task *task)
 408 {
 409         struct sas_internal *si = dev_to_sas_internal(task->dev);
 410         unsigned long flags;
 411         int res;
 412
 413         spin_lock_irqsave(&task->task_state_lock, flags);
 414         if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 415             task->task_state_flags & SAS_TASK_STATE_DONE) {
 416                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 417                 SAS_DPRINTK("%s: Task %p already finished.\n", __func__,
 418                             task);
 419                 goto out;
 420         }
 421         task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 422         spin_unlock_irqrestore(&task->task_state_lock, flags);
 423
 424         res = si->dft->lldd_abort_task(task);
 425
 426         spin_lock_irqsave(&task->task_state_lock, flags);
 427         if (task->task_state_flags & SAS_TASK_STATE_DONE ||
 428             res == TMF_RESP_FUNC_COMPLETE) {
 429                 spin_unlock_irqrestore(&task->task_state_lock, flags);
 430                 goto out;
 431         }
 432
 433         /* XXX we are not prepared to deal with ->lldd_abort_task()
 434          * failures.  TODO: lldds need to unconditionally forget about
 435          * aborted ata tasks, otherwise we (likely) leak the sas task
 436          * here
 437          */
 438         SAS_DPRINTK("%s: Task %p leaked.\n", __func__, task);
 439
 440         if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 441                 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 442         spin_unlock_irqrestore(&task->task_state_lock, flags);
 443
 444         return;
 445  out:
 446         list_del_init(&task->list);
 447         sas_free_task(task);
 448 }
 449
 450 static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 451 {
 452         if (qc->flags & ATA_QCFLAG_FAILED)
 453                 qc->err_mask |= AC_ERR_OTHER;
 454
 455         if (qc->err_mask) {
 456                 /*
 457                  * Find the sas_task and kill it.  By this point, libata
 458                  * has decided to kill the qc and has frozen the port.
 459                  * In this state sas_ata_task_done() will no longer free
 460                  * the sas_task, so we need to notify the lldd (via
 461                  * ->lldd_abort_task) that the task is dead and free it
 462                  *  ourselves.
 463                  */
 464                 struct sas_task *task = qc->lldd_task;
 465
 466                 qc->lldd_task = NULL;
 467                 if (!task)
 468                         return;
 469                 task->uldd_task = NULL;
 470                 sas_ata_internal_abort(task);
 471         }
 472 }
 473
 474
 475 static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
 476 {
 477         struct domain_device *dev = ap->private_data;
 478         struct sas_internal *i = dev_to_sas_internal(dev);
 479
 480         if (i->dft->lldd_ata_set_dmamode)
 481                 i->dft->lldd_ata_set_dmamode(dev);
 482 }
 483
 484 static struct ata_port_operations sas_sata_ops = {
 485         .prereset               = ata_std_prereset,
 486         .softreset              = sas_ata_soft_reset,
 487         .hardreset              = sas_ata_hard_reset,
 488         .postreset              = ata_std_postreset,
 489         .error_handler          = ata_std_error_handler,
 490         .post_internal_cmd      = sas_ata_post_internal,
 491         .qc_defer               = ata_std_qc_defer,
 492         .qc_prep                = ata_noop_qc_prep,
 493         .qc_issue               = sas_ata_qc_issue,
 494         .qc_fill_rtf            = sas_ata_qc_fill_rtf,
 495         .port_start             = ata_sas_port_start,
 496         .port_stop              = ata_sas_port_stop,
 497         .set_dmamode            = sas_ata_set_dmamode,
 498 };
 499
 500 static struct ata_port_info sata_port_info = {
 501         .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ,
 502         .pio_mask = ATA_PIO4,
 503         .mwdma_mask = ATA_MWDMA2,
 504         .udma_mask = ATA_UDMA6,
 505         .port_ops = &sas_sata_ops
 506 };
 507
 508 int sas_ata_init_host_and_port(struct domain_device *found_dev,
 509                                struct scsi_target *starget)
 510 {
 511         struct Scsi_Host *shost = dev_to_shost(&starget->dev);
 512         struct sas_ha_struct *ha = SHOST_TO_SAS_HA(shost);
 513         struct ata_port *ap;
 514
 515         ata_host_init(&found_dev->sata_dev.ata_host,
 516                       ha->dev,
 517                       sata_port_info.flags,
 518                       &sas_sata_ops);
 519         ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host,
 520                                 &sata_port_info,
 521                                 shost);
 522         if (!ap) {
 523                 SAS_DPRINTK("ata_sas_port_alloc failed.\n");
 524                 return -ENODEV;
 525         }
 526
 527         ap->private_data = found_dev;
 528         ap->cbl = ATA_CBL_SATA;
 529         ap->scsi_host = shost;
 530         found_dev->sata_dev.ap = ap;
 531
 532         return 0;
 533 }
 534
 535 void sas_ata_task_abort(struct sas_task *task)
 536 {
 537         struct ata_queued_cmd *qc = task->uldd_task;
 538         struct completion *waiting;
 539
 540         /* Bounce SCSI-initiated commands to the SCSI EH */
 541         if (qc->scsicmd) {
 542                 struct request_queue *q = qc->scsicmd->device->request_queue;
 543                 unsigned long flags;
 544
 545                 spin_lock_irqsave(q->queue_lock, flags);
 546                 blk_abort_request(qc->scsicmd->request);
 547                 spin_unlock_irqrestore(q->queue_lock, flags);
 548                 scsi_schedule_eh(qc->scsicmd->device->host);
 549                 return;
 550         }
 551
 552         /* Internal command, fake a timeout and complete. */
 553         qc->flags &= ~ATA_QCFLAG_ACTIVE;
 554         qc->flags |= ATA_QCFLAG_FAILED;
 555         qc->err_mask |= AC_ERR_TIMEOUT;
 556         waiting = qc->private_data;
 557         complete(waiting);
 558 }
 559
 560 static void sas_get_ata_command_set(struct domain_device *dev)
 561 {
 562         struct dev_to_host_fis *fis =
 563                 (struct dev_to_host_fis *) dev->frame_rcvd;
 564
 565         if ((fis->sector_count == 1 && /* ATA */
 566              fis->lbal         == 1 &&
 567              fis->lbam         == 0 &&
 568              fis->lbah         == 0 &&
 569              fis->device       == 0)
 570             ||
 571             (fis->sector_count == 0 && /* CE-ATA (mATA) */
 572              fis->lbal         == 0 &&
 573              fis->lbam         == 0xCE &&
 574              fis->lbah         == 0xAA &&
 575              (fis->device & ~0x10) == 0))
 576
 577                 dev->sata_dev.command_set = ATA_COMMAND_SET;
 578
 579         else if ((fis->interrupt_reason == 1 && /* ATAPI */
 580                   fis->lbal             == 1 &&
 581                   fis->byte_count_low   == 0x14 &&
 582                   fis->byte_count_high  == 0xEB &&
 583                   (fis->device & ~0x10) == 0))
 584
 585                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 586
 587         else if ((fis->sector_count == 1 && /* SEMB */
 588                   fis->lbal         == 1 &&
 589                   fis->lbam         == 0x3C &&
 590                   fis->lbah         == 0xC3 &&
 591                   fis->device       == 0)
 592                 ||
 593                  (fis->interrupt_reason == 1 && /* SATA PM */
 594                   fis->lbal             == 1 &&
 595                   fis->byte_count_low   == 0x69 &&
 596                   fis->byte_count_high  == 0x96 &&
 597                   (fis->device & ~0x10) == 0))
 598
 599                 /* Treat it as a superset? */
 600                 dev->sata_dev.command_set = ATAPI_COMMAND_SET;
 601 }
 602
 603 void sas_probe_sata(struct work_struct *work)
 604 {
 605         struct domain_device *dev, *n;
 606         struct sas_discovery_event *ev =
 607                 container_of(work, struct sas_discovery_event, work);
 608         struct asd_sas_port *port = ev->port;
 609
 610         clear_bit(DISCE_PROBE, &port->disc.pending);
 611
 612         list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) {
 613                 int err;
 614
 615                 spin_lock_irq(&port->dev_list_lock);
 616                 list_add_tail(&dev->dev_list_node, &port->dev_list);
 617                 spin_unlock_irq(&port->dev_list_lock);
 618
 619                 err = sas_rphy_add(dev->rphy);
 620
 621                 if (err) {
 622                         SAS_DPRINTK("%s: for %s device %16llx returned %d\n",
 623                                     __func__, dev->parent ? "exp-attached" :
 624                                                             "direct-attached",
 625                                     SAS_ADDR(dev->sas_addr), err);
 626                         sas_unregister_dev(port, dev);
 627                 } else
 628                         list_del_init(&dev->disco_list_node);
 629         }
 630 }
 631
 632 /**
 633  * sas_discover_sata -- discover an STP/SATA domain device
 634  * @dev: pointer to struct domain_device of interest
 635  *
 636  * Devices directly attached to a HA port, have no parents.  All other
 637  * devices do, and should have their "parent" pointer set appropriately
 638  * before calling this function.
 639  */
 640 int sas_discover_sata(struct domain_device *dev)
 641 {
 642         int res;
 643
 644         if (dev->dev_type == SATA_PM)
 645                 return -ENODEV;
 646
 647         sas_get_ata_command_set(dev);
 648         sas_fill_in_rphy(dev, dev->rphy);
 649
 650         res = sas_notify_lldd_dev_found(dev);
 651         if (res)
 652                 return res;
 653
 654         sas_discover_event(dev->port, DISCE_PROBE);
 655         return 0;
 656 }
 657
 658 static void async_sas_ata_eh(void *data, async_cookie_t cookie)
 659 {
 660         struct domain_device *dev = data;
 661         struct ata_port *ap = dev->sata_dev.ap;
 662         struct sas_ha_struct *ha = dev->port->ha;
 663
 664         /* hold a reference over eh since we may be racing with final
 665          * remove once all commands are completed
 666          */
 667         kref_get(&dev->kref);
 668         ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata port error handler");
 669         ata_scsi_port_error_handler(ha->core.shost, ap);
 670         sas_put_device(dev);
 671 }
 672
 673 void sas_ata_strategy_handler(struct Scsi_Host *shost)
 674 {
 675         struct scsi_device *sdev;
 676         struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 677         LIST_HEAD(async);
 678
 679         /* it's ok to defer revalidation events during ata eh, these
 680          * disks are in one of three states:
 681          * 1/ present for initial domain discovery, and these
 682          *    resets will cause bcn flutters
 683          * 2/ hot removed, we'll discover that after eh fails
 684          * 3/ hot added after initial discovery, lost the race, and need
 685          *    to catch the next train.
 686          */
 687         sas_disable_revalidation(sas_ha);
 688
 689         shost_for_each_device(sdev, shost) {
 690                 struct domain_device *ddev = sdev_to_domain_dev(sdev);
 691
 692                 if (!dev_is_sata(ddev))
 693                         continue;
 694
 695                 async_schedule_domain(async_sas_ata_eh, ddev, &async);
 696         }
 697         async_synchronize_full_domain(&async);
 698
 699         sas_enable_revalidation(sas_ha);
 700 }
 701
 702 int sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 703                struct list_head *done_q)
 704 {
 705         int rtn = 0;
 706         struct scsi_cmnd *cmd, *n;
 707         struct ata_port *ap;
 708
 709         do {
 710                 LIST_HEAD(sata_q);
 711
 712                 ap = NULL;
 713
 714                 list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 715                         struct domain_device *ddev = cmd_to_domain_dev(cmd);
 716
 717                         if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
 718                                 continue;
 719                         if (ap && ap != ddev->sata_dev.ap)
 720                                 continue;
 721                         ap = ddev->sata_dev.ap;
 722                         rtn = 1;
 723                         list_move(&cmd->eh_entry, &sata_q);
 724                 }
 725
 726                 if (!list_empty(&sata_q)) {
 727                         ata_port_printk(ap, KERN_DEBUG, "sas eh calling libata cmd error handler\n");
 728                         ata_scsi_cmd_error_handler(shost, ap, &sata_q);
 729                         /*
 730                          * ata's error handler may leave the cmd on the list
 731                          * so make sure they don't remain on a stack list
 732                          * about to go out of scope.
 733                          *
 734                          * This looks strange, since the commands are
 735                          * now part of no list, but the next error
 736                          * action will be ata_port_error_handler()
 737                          * which takes no list and sweeps them up
 738                          * anyway from the ata tag array.
 739                          */
 740                         while (!list_empty(&sata_q))
 741                                 list_del_init(sata_q.next);
 742                 }
 743         } while (ap);
 744
 745         return rtn;
 746 }
 747
 748 void sas_ata_schedule_reset(struct domain_device *dev)
 749 {
 750         struct ata_eh_info *ehi;
 751         struct ata_port *ap;
 752         unsigned long flags;
 753
 754         if (!dev_is_sata(dev))
 755                 return;
 756
 757         ap = dev->sata_dev.ap;
 758         ehi = &ap->link.eh_info;
 759
 760         spin_lock_irqsave(ap->lock, flags);
 761         ehi->err_mask |= AC_ERR_TIMEOUT;
 762         ehi->action |= ATA_EH_RESET;
 763         ata_port_schedule_eh(ap);
 764         spin_unlock_irqrestore(ap->lock, flags);
 765 }
 766 EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
 767
 768 void sas_ata_wait_eh(struct domain_device *dev)
 769 {
 770         struct ata_port *ap;
 771
 772         if (!dev_is_sata(dev))
 773                 return;
 774
 775         ap = dev->sata_dev.ap;
 776         ata_port_wait_eh(ap);
 777 }