linux/drivers/scsi/libsas/sas_ata.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Support for SATA devices on Serial Attached SCSI (SAS) controllers
   4 *
   5 * Copyright (C) 2006 IBM Corporation
   6 *
   7 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation
   8 */
   9
  10#include <linux/scatterlist.h>
  11#include <linux/slab.h>
  12#include <linux/async.h>
  13#include <linux/export.h>
  14
  15#include <scsi/sas_ata.h>
  16#include "sas_internal.h"
  17#include <scsi/scsi_host.h>
  18#include <scsi/scsi_device.h>
  19#include <scsi/scsi_tcq.h>
  20#include <scsi/scsi.h>
  21#include <scsi/scsi_transport.h>
  22#include <scsi/scsi_transport_sas.h>
  23#include "../scsi_sas_internal.h"
  24#include "../scsi_transport_api.h"
  25#include <scsi/scsi_eh.h>
  26
  27static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts)
  28{
  29        /* Cheesy attempt to translate SAS errors into ATA.  Hah! */
  30
  31        /* transport error */
  32        if (ts->resp == SAS_TASK_UNDELIVERED)
  33                return AC_ERR_ATA_BUS;
  34
  35        /* ts->resp == SAS_TASK_COMPLETE */
  36        /* task delivered, what happened afterwards? */
  37        switch (ts->stat) {
  38        case SAS_DEV_NO_RESPONSE:
  39                return AC_ERR_TIMEOUT;
  40        case SAS_INTERRUPTED:
  41        case SAS_PHY_DOWN:
  42        case SAS_NAK_R_ERR:
  43                return AC_ERR_ATA_BUS;
  44        case SAS_DATA_UNDERRUN:
  45                /*
  46                 * Some programs that use the taskfile interface
  47                 * (smartctl in particular) can cause underrun
  48                 * problems.  Ignore these errors, perhaps at our
  49                 * peril.
  50                 */
  51                return 0;
  52        case SAS_DATA_OVERRUN:
  53        case SAS_QUEUE_FULL:
  54        case SAS_DEVICE_UNKNOWN:
  55        case SAS_SG_ERR:
  56                return AC_ERR_INVALID;
  57        case SAS_OPEN_TO:
  58        case SAS_OPEN_REJECT:
  59                pr_warn("%s: Saw error %d.  What to do?\n",
  60                        __func__, ts->stat);
  61                return AC_ERR_OTHER;
  62        case SAM_STAT_CHECK_CONDITION:
  63        case SAS_ABORTED_TASK:
  64                return AC_ERR_DEV;
  65        case SAS_PROTO_RESPONSE:
  66                /* This means the ending_fis has the error
  67                 * value; return 0 here to collect it
  68                 */
  69                return 0;
  70        default:
  71                return 0;
  72        }
  73}
  74
  75static void sas_ata_task_done(struct sas_task *task)
  76{
  77        struct ata_queued_cmd *qc = task->uldd_task;
  78        struct domain_device *dev = task->dev;
  79        struct task_status_struct *stat = &task->task_status;
  80        struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf;
  81        struct sas_ha_struct *sas_ha = dev->port->ha;
  82        enum ata_completion_errors ac;
  83        unsigned long flags;
  84        struct ata_link *link;
  85        struct ata_port *ap;
  86
  87        spin_lock_irqsave(&dev->done_lock, flags);
  88        if (test_bit(SAS_HA_FROZEN, &sas_ha->state))
  89                task = NULL;
  90        else if (qc && qc->scsicmd)
  91                ASSIGN_SAS_TASK(qc->scsicmd, NULL);
  92        spin_unlock_irqrestore(&dev->done_lock, flags);
  93
  94        /* check if libsas-eh got to the task before us */
  95        if (unlikely(!task))
  96                return;
  97
  98        if (!qc)
  99                goto qc_already_gone;
 100
 101        ap = qc->ap;
 102        link = &ap->link;
 103
 104        spin_lock_irqsave(ap->lock, flags);
 105        /* check if we lost the race with libata/sas_ata_post_internal() */
 106        if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) {
 107                spin_unlock_irqrestore(ap->lock, flags);
 108                if (qc->scsicmd)
 109                        goto qc_already_gone;
 110                else {
 111                        /* if eh is not involved and the port is frozen then the
 112                         * ata internal abort process has taken responsibility
 113                         * for this sas_task
 114                         */
 115                        return;
 116                }
 117        }
 118
 119        if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD ||
 120            ((stat->stat == SAM_STAT_CHECK_CONDITION &&
 121              dev->sata_dev.class == ATA_DEV_ATAPI))) {
 122                memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE);
 123
 124                if (!link->sactive) {
 125                        qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
 126                } else {
 127                        link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]);
 128                        if (unlikely(link->eh_info.err_mask))
 129                                qc->flags |= ATA_QCFLAG_FAILED;
 130                }
 131        } else {
 132                ac = sas_to_ata_err(stat);
 133                if (ac) {
 134                        pr_warn("%s: SAS error 0x%x\n", __func__, stat->stat);
 135                        /* We saw a SAS error. Send a vague error. */
 136                        if (!link->sactive) {
 137                                qc->err_mask = ac;
 138                        } else {
 139                                link->eh_info.err_mask |= AC_ERR_DEV;
 140                                qc->flags |= ATA_QCFLAG_FAILED;
 141                        }
 142
 143                        dev->sata_dev.fis[3] = 0x04; /* status err */
 144                        dev->sata_dev.fis[2] = ATA_ERR;
 145                }
 146        }
 147
 148        qc->lldd_task = NULL;
 149        ata_qc_complete(qc);
 150        spin_unlock_irqrestore(ap->lock, flags);
 151
 152qc_already_gone:
 153        sas_free_task(task);
 154}
 155
 156static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc)
 157        __must_hold(ap->lock)
 158{
 159        struct sas_task *task;
 160        struct scatterlist *sg;
 161        int ret = AC_ERR_SYSTEM;
 162        unsigned int si, xfer = 0;
 163        struct ata_port *ap = qc->ap;
 164        struct domain_device *dev = ap->private_data;
 165        struct sas_ha_struct *sas_ha = dev->port->ha;
 166        struct Scsi_Host *host = sas_ha->core.shost;
 167        struct sas_internal *i = to_sas_internal(host->transportt);
 168
 169        /* TODO: we should try to remove that unlock */
 170        spin_unlock(ap->lock);
 171
 172        /* If the device fell off, no sense in issuing commands */
 173        if (test_bit(SAS_DEV_GONE, &dev->state))
 174                goto out;
 175
 176        task = sas_alloc_task(GFP_ATOMIC);
 177        if (!task)
 178                goto out;
 179        task->dev = dev;
 180        task->task_proto = SAS_PROTOCOL_STP;
 181        task->task_done = sas_ata_task_done;
 182
 183        if (qc->tf.command == ATA_CMD_FPDMA_WRITE ||
 184            qc->tf.command == ATA_CMD_FPDMA_READ ||
 185            qc->tf.command == ATA_CMD_FPDMA_RECV ||
 186            qc->tf.command == ATA_CMD_FPDMA_SEND ||
 187            qc->tf.command == ATA_CMD_NCQ_NON_DATA) {
 188                /* Need to zero out the tag libata assigned us */
 189                qc->tf.nsect = 0;
 190        }
 191
 192        ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis);
 193        task->uldd_task = qc;
 194        if (ata_is_atapi(qc->tf.protocol)) {
 195                memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len);
 196                task->total_xfer_len = qc->nbytes;
 197                task->num_scatter = qc->n_elem;
 198                task->data_dir = qc->dma_dir;
 199        } else if (qc->tf.protocol == ATA_PROT_NODATA) {
 200                task->data_dir = DMA_NONE;
 201        } else {
 202                for_each_sg(qc->sg, sg, qc->n_elem, si)
 203                        xfer += sg_dma_len(sg);
 204
 205                task->total_xfer_len = xfer;
 206                task->num_scatter = si;
 207                task->data_dir = qc->dma_dir;
 208        }
 209        task->scatter = qc->sg;
 210        task->ata_task.retry_count = 1;
 211        task->task_state_flags = SAS_TASK_STATE_PENDING;
 212        qc->lldd_task = task;
 213
 214        task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol);
 215        task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol);
 216
 217        if (qc->scsicmd)
 218                ASSIGN_SAS_TASK(qc->scsicmd, task);
 219
 220        ret = i->dft->lldd_execute_task(task, GFP_ATOMIC);
 221        if (ret) {
 222                pr_debug("lldd_execute_task returned: %d\n", ret);
 223
 224                if (qc->scsicmd)
 225                        ASSIGN_SAS_TASK(qc->scsicmd, NULL);
 226                sas_free_task(task);
 227                qc->lldd_task = NULL;
 228                ret = AC_ERR_SYSTEM;
 229        }
 230
 231 out:
 232        spin_lock(ap->lock);
 233        return ret;
 234}
 235
 236static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc)
 237{
 238        struct domain_device *dev = qc->ap->private_data;
 239
 240        ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf);
 241        return true;
 242}
 243
 244static struct sas_internal *dev_to_sas_internal(struct domain_device *dev)
 245{
 246        return to_sas_internal(dev->port->ha->core.shost->transportt);
 247}
 248
 249static int sas_get_ata_command_set(struct domain_device *dev);
 250
 251int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy)
 252{
 253        if (phy->attached_tproto & SAS_PROTOCOL_STP)
 254                dev->tproto = phy->attached_tproto;
 255        if (phy->attached_sata_dev)
 256                dev->tproto |= SAS_SATA_DEV;
 257
 258        if (phy->attached_dev_type == SAS_SATA_PENDING)
 259                dev->dev_type = SAS_SATA_PENDING;
 260        else {
 261                int res;
 262
 263                dev->dev_type = SAS_SATA_DEV;
 264                res = sas_get_report_phy_sata(dev->parent, phy->phy_id,
 265                                              &dev->sata_dev.rps_resp);
 266                if (res) {
 267                        pr_debug("report phy sata to %016llx:%02d returned 0x%x\n",
 268                                 SAS_ADDR(dev->parent->sas_addr),
 269                                 phy->phy_id, res);
 270                        return res;
 271                }
 272                memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis,
 273                       sizeof(struct dev_to_host_fis));
 274                dev->sata_dev.class = sas_get_ata_command_set(dev);
 275        }
 276        return 0;
 277}
 278
 279static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy)
 280{
 281        int res;
 282
 283        /* we weren't pending, so successfully end the reset sequence now */
 284        if (dev->dev_type != SAS_SATA_PENDING)
 285                return 1;
 286
 287        /* hmmm, if this succeeds do we need to repost the domain_device to the
 288         * lldd so it can pick up new parameters?
 289         */
 290        res = sas_get_ata_info(dev, phy);
 291        if (res)
 292                return 0; /* retry */
 293        else
 294                return 1;
 295}
 296
 297static int smp_ata_check_ready(struct ata_link *link)
 298{
 299        int res;
 300        struct ata_port *ap = link->ap;
 301        struct domain_device *dev = ap->private_data;
 302        struct domain_device *ex_dev = dev->parent;
 303        struct sas_phy *phy = sas_get_local_phy(dev);
 304        struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number];
 305
 306        res = sas_ex_phy_discover(ex_dev, phy->number);
 307        sas_put_local_phy(phy);
 308
 309        /* break the wait early if the expander is unreachable,
 310         * otherwise keep polling
 311         */
 312        if (res == -ECOMM)
 313                return res;
 314        if (res != SMP_RESP_FUNC_ACC)
 315                return 0;
 316
 317        switch (ex_phy->attached_dev_type) {
 318        case SAS_SATA_PENDING:
 319                return 0;
 320        case SAS_END_DEVICE:
 321                if (ex_phy->attached_sata_dev)
 322                        return sas_ata_clear_pending(dev, ex_phy);
 323                fallthrough;
 324        default:
 325                return -ENODEV;
 326        }
 327}
 328
 329static int local_ata_check_ready(struct ata_link *link)
 330{
 331        struct ata_port *ap = link->ap;
 332        struct domain_device *dev = ap->private_data;
 333        struct sas_internal *i = dev_to_sas_internal(dev);
 334
 335        if (i->dft->lldd_ata_check_ready)
 336                return i->dft->lldd_ata_check_ready(dev);
 337        else {
 338                /* lldd's that don't implement 'ready' checking get the
 339                 * old default behavior of not coordinating reset
 340                 * recovery with libata
 341                 */
 342                return 1;
 343        }
 344}
 345
 346static int sas_ata_printk(const char *level, const struct domain_device *ddev,
 347                          const char *fmt, ...)
 348{
 349        struct ata_port *ap = ddev->sata_dev.ap;
 350        struct device *dev = &ddev->rphy->dev;
 351        struct va_format vaf;
 352        va_list args;
 353        int r;
 354
 355        va_start(args, fmt);
 356
 357        vaf.fmt = fmt;
 358        vaf.va = &args;
 359
 360        r = printk("%s" SAS_FMT "ata%u: %s: %pV",
 361                   level, ap->print_id, dev_name(dev), &vaf);
 362
 363        va_end(args);
 364
 365        return r;
 366}
 367
 368static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class,
 369                              unsigned long deadline)
 370{
 371        int ret = 0, res;
 372        struct sas_phy *phy;
 373        struct ata_port *ap = link->ap;
 374        int (*check_ready)(struct ata_link *link);
 375        struct domain_device *dev = ap->private_data;
 376        struct sas_internal *i = dev_to_sas_internal(dev);
 377
 378        res = i->dft->lldd_I_T_nexus_reset(dev);
 379        if (res == -ENODEV)
 380                return res;
 381
 382        if (res != TMF_RESP_FUNC_COMPLETE)
 383                sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n");
 384
 385        phy = sas_get_local_phy(dev);
 386        if (scsi_is_sas_phy_local(phy))
 387                check_ready = local_ata_check_ready;
 388        else
 389                check_ready = smp_ata_check_ready;
 390        sas_put_local_phy(phy);
 391
 392        ret = ata_wait_after_reset(link, deadline, check_ready);
 393        if (ret && ret != -EAGAIN)
 394                sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret);
 395
 396        *class = dev->sata_dev.class;
 397
 398        ap->cbl = ATA_CBL_SATA;
 399        return ret;
 400}
 401
 402/*
 403 * notify the lldd to forget the sas_task for this internal ata command
 404 * that bypasses scsi-eh
 405 */
 406static void sas_ata_internal_abort(struct sas_task *task)
 407{
 408        struct sas_internal *si = dev_to_sas_internal(task->dev);
 409        unsigned long flags;
 410        int res;
 411
 412        spin_lock_irqsave(&task->task_state_lock, flags);
 413        if (task->task_state_flags & SAS_TASK_STATE_ABORTED ||
 414            task->task_state_flags & SAS_TASK_STATE_DONE) {
 415                spin_unlock_irqrestore(&task->task_state_lock, flags);
 416                pr_debug("%s: Task %p already finished.\n", __func__, task);
 417                goto out;
 418        }
 419        task->task_state_flags |= SAS_TASK_STATE_ABORTED;
 420        spin_unlock_irqrestore(&task->task_state_lock, flags);
 421
 422        res = si->dft->lldd_abort_task(task);
 423
 424        spin_lock_irqsave(&task->task_state_lock, flags);
 425        if (task->task_state_flags & SAS_TASK_STATE_DONE ||
 426            res == TMF_RESP_FUNC_COMPLETE) {
 427                spin_unlock_irqrestore(&task->task_state_lock, flags);
 428                goto out;
 429        }
 430
 431        /* XXX we are not prepared to deal with ->lldd_abort_task()
 432         * failures.  TODO: lldds need to unconditionally forget about
 433         * aborted ata tasks, otherwise we (likely) leak the sas task
 434         * here
 435         */
 436        pr_warn("%s: Task %p leaked.\n", __func__, task);
 437
 438        if (!(task->task_state_flags & SAS_TASK_STATE_DONE))
 439                task->task_state_flags &= ~SAS_TASK_STATE_ABORTED;
 440        spin_unlock_irqrestore(&task->task_state_lock, flags);
 441
 442        return;
 443 out:
 444        sas_free_task(task);
 445}
 446
 447static void sas_ata_post_internal(struct ata_queued_cmd *qc)
 448{
 449        if (qc->flags & ATA_QCFLAG_FAILED)
 450                qc->err_mask |= AC_ERR_OTHER;
 451
 452        if (qc->err_mask) {
 453                /*
 454                 * Find the sas_task and kill it.  By this point, libata
 455                 * has decided to kill the qc and has frozen the port.
 456                 * In this state sas_ata_task_done() will no longer free
 457                 * the sas_task, so we need to notify the lldd (via
 458                 * ->lldd_abort_task) that the task is dead and free it
 459                 *  ourselves.
 460                 */
 461                struct sas_task *task = qc->lldd_task;
 462
 463                qc->lldd_task = NULL;
 464                if (!task)
 465                        return;
 466                task->uldd_task = NULL;
 467                sas_ata_internal_abort(task);
 468        }
 469}
 470
 471
 472static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev)
 473{
 474        struct domain_device *dev = ap->private_data;
 475        struct sas_internal *i = dev_to_sas_internal(dev);
 476
 477        if (i->dft->lldd_ata_set_dmamode)
 478                i->dft->lldd_ata_set_dmamode(dev);
 479}
 480
 481static void sas_ata_sched_eh(struct ata_port *ap)
 482{
 483        struct domain_device *dev = ap->private_data;
 484        struct sas_ha_struct *ha = dev->port->ha;
 485        unsigned long flags;
 486
 487        spin_lock_irqsave(&ha->lock, flags);
 488        if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state))
 489                ha->eh_active++;
 490        ata_std_sched_eh(ap);
 491        spin_unlock_irqrestore(&ha->lock, flags);
 492}
 493
 494void sas_ata_end_eh(struct ata_port *ap)
 495{
 496        struct domain_device *dev = ap->private_data;
 497        struct sas_ha_struct *ha = dev->port->ha;
 498        unsigned long flags;
 499
 500        spin_lock_irqsave(&ha->lock, flags);
 501        if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state))
 502                ha->eh_active--;
 503        spin_unlock_irqrestore(&ha->lock, flags);
 504}
 505
 506static int sas_ata_prereset(struct ata_link *link, unsigned long deadline)
 507{
 508        struct ata_port *ap = link->ap;
 509        struct domain_device *dev = ap->private_data;
 510        struct sas_phy *local_phy = sas_get_local_phy(dev);
 511        int res = 0;
 512
 513        if (!local_phy->enabled || test_bit(SAS_DEV_GONE, &dev->state))
 514                res = -ENOENT;
 515        sas_put_local_phy(local_phy);
 516
 517        return res;
 518}
 519
 520static struct ata_port_operations sas_sata_ops = {
 521        .prereset               = sas_ata_prereset,
 522        .hardreset              = sas_ata_hard_reset,
 523        .error_handler          = ata_std_error_handler,
 524        .post_internal_cmd      = sas_ata_post_internal,
 525        .qc_defer               = ata_std_qc_defer,
 526        .qc_prep                = ata_noop_qc_prep,
 527        .qc_issue               = sas_ata_qc_issue,
 528        .qc_fill_rtf            = sas_ata_qc_fill_rtf,
 529        .port_start             = ata_sas_port_start,
 530        .port_stop              = ata_sas_port_stop,
 531        .set_dmamode            = sas_ata_set_dmamode,
 532        .sched_eh               = sas_ata_sched_eh,
 533        .end_eh                 = sas_ata_end_eh,
 534};
 535
 536static struct ata_port_info sata_port_info = {
 537        .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ |
 538                 ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX,
 539        .pio_mask = ATA_PIO4,
 540        .mwdma_mask = ATA_MWDMA2,
 541        .udma_mask = ATA_UDMA6,
 542        .port_ops = &sas_sata_ops
 543};
 544
 545int sas_ata_init(struct domain_device *found_dev)
 546{
 547        struct sas_ha_struct *ha = found_dev->port->ha;
 548        struct Scsi_Host *shost = ha->core.shost;
 549        struct ata_host *ata_host;
 550        struct ata_port *ap;
 551        int rc;
 552
 553        ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL);
 554        if (!ata_host)  {
 555                pr_err("ata host alloc failed.\n");
 556                return -ENOMEM;
 557        }
 558
 559        ata_host_init(ata_host, ha->dev, &sas_sata_ops);
 560
 561        ap = ata_sas_port_alloc(ata_host, &sata_port_info, shost);
 562        if (!ap) {
 563                pr_err("ata_sas_port_alloc failed.\n");
 564                rc = -ENODEV;
 565                goto free_host;
 566        }
 567
 568        ap->private_data = found_dev;
 569        ap->cbl = ATA_CBL_SATA;
 570        ap->scsi_host = shost;
 571        rc = ata_sas_port_init(ap);
 572        if (rc)
 573                goto destroy_port;
 574
 575        rc = ata_sas_tport_add(ata_host->dev, ap);
 576        if (rc)
 577                goto destroy_port;
 578
 579        found_dev->sata_dev.ata_host = ata_host;
 580        found_dev->sata_dev.ap = ap;
 581
 582        return 0;
 583
 584destroy_port:
 585        ata_sas_port_destroy(ap);
 586free_host:
 587        ata_host_put(ata_host);
 588        return rc;
 589}
 590
 591void sas_ata_task_abort(struct sas_task *task)
 592{
 593        struct ata_queued_cmd *qc = task->uldd_task;
 594        struct completion *waiting;
 595
 596        /* Bounce SCSI-initiated commands to the SCSI EH */
 597        if (qc->scsicmd) {
 598                blk_abort_request(qc->scsicmd->request);
 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
 610static 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
 624void 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_enabled(sas_to_ata_dev(dev)))
 647                        sas_fail_probe(dev, __func__, -ENODEV);
 648        }
 649
 650}
 651
 652static 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
 668void 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
 690void 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 */
 720int sas_discover_sata(struct domain_device *dev)
 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        return sas_notify_lldd_dev_found(dev);
 729}
 730
 731static void async_sas_ata_eh(void *data, async_cookie_t cookie)
 732{
 733        struct domain_device *dev = data;
 734        struct ata_port *ap = dev->sata_dev.ap;
 735        struct sas_ha_struct *ha = dev->port->ha;
 736
 737        sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n");
 738        ata_scsi_port_error_handler(ha->core.shost, ap);
 739        sas_put_device(dev);
 740}
 741
 742void sas_ata_strategy_handler(struct Scsi_Host *shost)
 743{
 744        struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost);
 745        ASYNC_DOMAIN_EXCLUSIVE(async);
 746        int i;
 747
 748        /* it's ok to defer revalidation events during ata eh, these
 749         * disks are in one of three states:
 750         * 1/ present for initial domain discovery, and these
 751         *    resets will cause bcn flutters
 752         * 2/ hot removed, we'll discover that after eh fails
 753         * 3/ hot added after initial discovery, lost the race, and need
 754         *    to catch the next train.
 755         */
 756        sas_disable_revalidation(sas_ha);
 757
 758        spin_lock_irq(&sas_ha->phy_port_lock);
 759        for (i = 0; i < sas_ha->num_phys; i++) {
 760                struct asd_sas_port *port = sas_ha->sas_port[i];
 761                struct domain_device *dev;
 762
 763                spin_lock(&port->dev_list_lock);
 764                list_for_each_entry(dev, &port->dev_list, dev_list_node) {
 765                        if (!dev_is_sata(dev))
 766                                continue;
 767
 768                        /* hold a reference over eh since we may be
 769                         * racing with final remove once all commands
 770                         * are completed
 771                         */
 772                        kref_get(&dev->kref);
 773
 774                        async_schedule_domain(async_sas_ata_eh, dev, &async);
 775                }
 776                spin_unlock(&port->dev_list_lock);
 777        }
 778        spin_unlock_irq(&sas_ha->phy_port_lock);
 779
 780        async_synchronize_full_domain(&async);
 781
 782        sas_enable_revalidation(sas_ha);
 783}
 784
 785void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q,
 786                struct list_head *done_q)
 787{
 788        struct scsi_cmnd *cmd, *n;
 789        struct domain_device *eh_dev;
 790
 791        do {
 792                LIST_HEAD(sata_q);
 793                eh_dev = NULL;
 794
 795                list_for_each_entry_safe(cmd, n, work_q, eh_entry) {
 796                        struct domain_device *ddev = cmd_to_domain_dev(cmd);
 797
 798                        if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd))
 799                                continue;
 800                        if (eh_dev && eh_dev != ddev)
 801                                continue;
 802                        eh_dev = ddev;
 803                        list_move(&cmd->eh_entry, &sata_q);
 804                }
 805
 806                if (!list_empty(&sata_q)) {
 807                        struct ata_port *ap = eh_dev->sata_dev.ap;
 808
 809                        sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n");
 810                        ata_scsi_cmd_error_handler(shost, ap, &sata_q);
 811                        /*
 812                         * ata's error handler may leave the cmd on the list
 813                         * so make sure they don't remain on a stack list
 814                         * about to go out of scope.
 815                         *
 816                         * This looks strange, since the commands are
 817                         * now part of no list, but the next error
 818                         * action will be ata_port_error_handler()
 819                         * which takes no list and sweeps them up
 820                         * anyway from the ata tag array.
 821                         */
 822                        while (!list_empty(&sata_q))
 823                                list_del_init(sata_q.next);
 824                }
 825        } while (eh_dev);
 826}
 827
 828void sas_ata_schedule_reset(struct domain_device *dev)
 829{
 830        struct ata_eh_info *ehi;
 831        struct ata_port *ap;
 832        unsigned long flags;
 833
 834        if (!dev_is_sata(dev))
 835                return;
 836
 837        ap = dev->sata_dev.ap;
 838        ehi = &ap->link.eh_info;
 839
 840        spin_lock_irqsave(ap->lock, flags);
 841        ehi->err_mask |= AC_ERR_TIMEOUT;
 842        ehi->action |= ATA_EH_RESET;
 843        ata_port_schedule_eh(ap);
 844        spin_unlock_irqrestore(ap->lock, flags);
 845}
 846EXPORT_SYMBOL_GPL(sas_ata_schedule_reset);
 847
 848void sas_ata_wait_eh(struct domain_device *dev)
 849{
 850        struct ata_port *ap;
 851
 852        if (!dev_is_sata(dev))
 853                return;
 854
 855        ap = dev->sata_dev.ap;
 856        ata_port_wait_eh(ap);
 857}
 858