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 27 static 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 75 static 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 || 120 stat->stat == SAS_SAM_STAT_GOOD || 121 (stat->stat == SAS_SAM_STAT_CHECK_CONDITION && 122 dev->sata_dev.class == ATA_DEV_ATAPI)) { 123 memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE); 124 125 if (!link->sactive) { 126 qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]); 127 } else { 128 link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]); 129 if (unlikely(link->eh_info.err_mask)) 130 qc->flags |= ATA_QCFLAG_FAILED; 131 } 132 } else { 133 ac = sas_to_ata_err(stat); 134 if (ac) { 135 pr_warn("%s: SAS error 0x%x\n", __func__, stat->stat); 136 /* We saw a SAS error. Send a vague error. */ 137 if (!link->sactive) { 138 qc->err_mask = ac; 139 } else { 140 link->eh_info.err_mask |= AC_ERR_DEV; 141 qc->flags |= ATA_QCFLAG_FAILED; 142 } 143 144 dev->sata_dev.fis[3] = 0x04; /* status err */ 145 dev->sata_dev.fis[2] = ATA_ERR; 146 } 147 } 148 149 qc->lldd_task = NULL; 150 ata_qc_complete(qc); 151 spin_unlock_irqrestore(ap->lock, flags); 152 153 qc_already_gone: 154 sas_free_task(task); 155 } 156 157 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) 158 __must_hold(ap->lock) 159 { 160 struct sas_task *task; 161 struct scatterlist *sg; 162 int ret = AC_ERR_SYSTEM; 163 unsigned int si, xfer = 0; 164 struct ata_port *ap = qc->ap; 165 struct domain_device *dev = ap->private_data; 166 struct sas_ha_struct *sas_ha = dev->port->ha; 167 struct Scsi_Host *host = sas_ha->core.shost; 168 struct sas_internal *i = to_sas_internal(host->transportt); 169 170 /* TODO: we should try to remove that unlock */ 171 spin_unlock(ap->lock); 172 173 /* If the device fell off, no sense in issuing commands */ 174 if (test_bit(SAS_DEV_GONE, &dev->state)) 175 goto out; 176 177 task = sas_alloc_task(GFP_ATOMIC); 178 if (!task) 179 goto out; 180 task->dev = dev; 181 task->task_proto = SAS_PROTOCOL_STP; 182 task->task_done = sas_ata_task_done; 183 184 if (qc->tf.command == ATA_CMD_FPDMA_WRITE || 185 qc->tf.command == ATA_CMD_FPDMA_READ || 186 qc->tf.command == ATA_CMD_FPDMA_RECV || 187 qc->tf.command == ATA_CMD_FPDMA_SEND || 188 qc->tf.command == ATA_CMD_NCQ_NON_DATA) { 189 /* Need to zero out the tag libata assigned us */ 190 qc->tf.nsect = 0; 191 } 192 193 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis); 194 task->uldd_task = qc; 195 if (ata_is_atapi(qc->tf.protocol)) { 196 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len); 197 task->total_xfer_len = qc->nbytes; 198 task->num_scatter = qc->n_elem; 199 task->data_dir = qc->dma_dir; 200 } else if (qc->tf.protocol == ATA_PROT_NODATA) { 201 task->data_dir = DMA_NONE; 202 } else { 203 for_each_sg(qc->sg, sg, qc->n_elem, si) 204 xfer += sg_dma_len(sg); 205 206 task->total_xfer_len = xfer; 207 task->num_scatter = si; 208 task->data_dir = qc->dma_dir; 209 } 210 task->scatter = qc->sg; 211 task->ata_task.retry_count = 1; 212 task->task_state_flags = SAS_TASK_STATE_PENDING; 213 qc->lldd_task = task; 214 215 task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol); 216 task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol); 217 218 if (qc->scsicmd) 219 ASSIGN_SAS_TASK(qc->scsicmd, task); 220 221 ret = i->dft->lldd_execute_task(task, GFP_ATOMIC); 222 if (ret) { 223 pr_debug("lldd_execute_task returned: %d\n", ret); 224 225 if (qc->scsicmd) 226 ASSIGN_SAS_TASK(qc->scsicmd, NULL); 227 sas_free_task(task); 228 qc->lldd_task = NULL; 229 ret = AC_ERR_SYSTEM; 230 } 231 232 out: 233 spin_lock(ap->lock); 234 return ret; 235 } 236 237 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc) 238 { 239 struct domain_device *dev = qc->ap->private_data; 240 241 ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf); 242 return true; 243 } 244 245 static struct sas_internal *dev_to_sas_internal(struct domain_device *dev) 246 { 247 return to_sas_internal(dev->port->ha->core.shost->transportt); 248 } 249 250 static int sas_get_ata_command_set(struct domain_device *dev); 251 252 int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy) 253 { 254 if (phy->attached_tproto & SAS_PROTOCOL_STP) 255 dev->tproto = phy->attached_tproto; 256 if (phy->attached_sata_dev) 257 dev->tproto |= SAS_SATA_DEV; 258 259 if (phy->attached_dev_type == SAS_SATA_PENDING) 260 dev->dev_type = SAS_SATA_PENDING; 261 else { 262 int res; 263 264 dev->dev_type = SAS_SATA_DEV; 265 res = sas_get_report_phy_sata(dev->parent, phy->phy_id, 266 &dev->sata_dev.rps_resp); 267 if (res) { 268 pr_debug("report phy sata to %016llx:%02d returned 0x%x\n", 269 SAS_ADDR(dev->parent->sas_addr), 270 phy->phy_id, res); 271 return res; 272 } 273 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis, 274 sizeof(struct dev_to_host_fis)); 275 dev->sata_dev.class = sas_get_ata_command_set(dev); 276 } 277 return 0; 278 } 279 280 static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy) 281 { 282 int res; 283 284 /* we weren't pending, so successfully end the reset sequence now */ 285 if (dev->dev_type != SAS_SATA_PENDING) 286 return 1; 287 288 /* hmmm, if this succeeds do we need to repost the domain_device to the 289 * lldd so it can pick up new parameters? 290 */ 291 res = sas_get_ata_info(dev, phy); 292 if (res) 293 return 0; /* retry */ 294 else 295 return 1; 296 } 297 298 static int smp_ata_check_ready(struct ata_link *link) 299 { 300 int res; 301 struct ata_port *ap = link->ap; 302 struct domain_device *dev = ap->private_data; 303 struct domain_device *ex_dev = dev->parent; 304 struct sas_phy *phy = sas_get_local_phy(dev); 305 struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number]; 306 307 res = sas_ex_phy_discover(ex_dev, phy->number); 308 sas_put_local_phy(phy); 309 310 /* break the wait early if the expander is unreachable, 311 * otherwise keep polling 312 */ 313 if (res == -ECOMM) 314 return res; 315 if (res != SMP_RESP_FUNC_ACC) 316 return 0; 317 318 switch (ex_phy->attached_dev_type) { 319 case SAS_SATA_PENDING: 320 return 0; 321 case SAS_END_DEVICE: 322 if (ex_phy->attached_sata_dev) 323 return sas_ata_clear_pending(dev, ex_phy); 324 fallthrough; 325 default: 326 return -ENODEV; 327 } 328 } 329 330 static int local_ata_check_ready(struct ata_link *link) 331 { 332 struct ata_port *ap = link->ap; 333 struct domain_device *dev = ap->private_data; 334 struct sas_internal *i = dev_to_sas_internal(dev); 335 336 if (i->dft->lldd_ata_check_ready) 337 return i->dft->lldd_ata_check_ready(dev); 338 else { 339 /* lldd's that don't implement 'ready' checking get the 340 * old default behavior of not coordinating reset 341 * recovery with libata 342 */ 343 return 1; 344 } 345 } 346 347 static int sas_ata_printk(const char *level, const struct domain_device *ddev, 348 const char *fmt, ...) 349 { 350 struct ata_port *ap = ddev->sata_dev.ap; 351 struct device *dev = &ddev->rphy->dev; 352 struct va_format vaf; 353 va_list args; 354 int r; 355 356 va_start(args, fmt); 357 358 vaf.fmt = fmt; 359 vaf.va = &args; 360 361 r = printk("%s" SAS_FMT "ata%u: %s: %pV", 362 level, ap->print_id, dev_name(dev), &vaf); 363 364 va_end(args); 365 366 return r; 367 } 368 369 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class, 370 unsigned long deadline) 371 { 372 int ret = 0, res; 373 struct sas_phy *phy; 374 struct ata_port *ap = link->ap; 375 int (*check_ready)(struct ata_link *link); 376 struct domain_device *dev = ap->private_data; 377 struct sas_internal *i = dev_to_sas_internal(dev); 378 379 res = i->dft->lldd_I_T_nexus_reset(dev); 380 if (res == -ENODEV) 381 return res; 382 383 if (res != TMF_RESP_FUNC_COMPLETE) 384 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n"); 385 386 phy = sas_get_local_phy(dev); 387 if (scsi_is_sas_phy_local(phy)) 388 check_ready = local_ata_check_ready; 389 else 390 check_ready = smp_ata_check_ready; 391 sas_put_local_phy(phy); 392 393 ret = ata_wait_after_reset(link, deadline, check_ready); 394 if (ret && ret != -EAGAIN) 395 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret); 396 397 *class = dev->sata_dev.class; 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 pr_debug("%s: Task %p already finished.\n", __func__, task); 418 goto out; 419 } 420 task->task_state_flags |= SAS_TASK_STATE_ABORTED; 421 spin_unlock_irqrestore(&task->task_state_lock, flags); 422 423 res = si->dft->lldd_abort_task(task); 424 425 spin_lock_irqsave(&task->task_state_lock, flags); 426 if (task->task_state_flags & SAS_TASK_STATE_DONE || 427 res == TMF_RESP_FUNC_COMPLETE) { 428 spin_unlock_irqrestore(&task->task_state_lock, flags); 429 goto out; 430 } 431 432 /* XXX we are not prepared to deal with ->lldd_abort_task() 433 * failures. TODO: lldds need to unconditionally forget about 434 * aborted ata tasks, otherwise we (likely) leak the sas task 435 * here 436 */ 437 pr_warn("%s: Task %p leaked.\n", __func__, task); 438 439 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) 440 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED; 441 spin_unlock_irqrestore(&task->task_state_lock, flags); 442 443 return; 444 out: 445 sas_free_task(task); 446 } 447 448 static void sas_ata_post_internal(struct ata_queued_cmd *qc) 449 { 450 if (qc->flags & ATA_QCFLAG_FAILED) 451 qc->err_mask |= AC_ERR_OTHER; 452 453 if (qc->err_mask) { 454 /* 455 * Find the sas_task and kill it. By this point, libata 456 * has decided to kill the qc and has frozen the port. 457 * In this state sas_ata_task_done() will no longer free 458 * the sas_task, so we need to notify the lldd (via 459 * ->lldd_abort_task) that the task is dead and free it 460 * ourselves. 461 */ 462 struct sas_task *task = qc->lldd_task; 463 464 qc->lldd_task = NULL; 465 if (!task) 466 return; 467 task->uldd_task = NULL; 468 sas_ata_internal_abort(task); 469 } 470 } 471 472 473 static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev) 474 { 475 struct domain_device *dev = ap->private_data; 476 struct sas_internal *i = dev_to_sas_internal(dev); 477 478 if (i->dft->lldd_ata_set_dmamode) 479 i->dft->lldd_ata_set_dmamode(dev); 480 } 481 482 static void sas_ata_sched_eh(struct ata_port *ap) 483 { 484 struct domain_device *dev = ap->private_data; 485 struct sas_ha_struct *ha = dev->port->ha; 486 unsigned long flags; 487 488 spin_lock_irqsave(&ha->lock, flags); 489 if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state)) 490 ha->eh_active++; 491 ata_std_sched_eh(ap); 492 spin_unlock_irqrestore(&ha->lock, flags); 493 } 494 495 void sas_ata_end_eh(struct ata_port *ap) 496 { 497 struct domain_device *dev = ap->private_data; 498 struct sas_ha_struct *ha = dev->port->ha; 499 unsigned long flags; 500 501 spin_lock_irqsave(&ha->lock, flags); 502 if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state)) 503 ha->eh_active--; 504 spin_unlock_irqrestore(&ha->lock, flags); 505 } 506 507 static int sas_ata_prereset(struct ata_link *link, unsigned long deadline) 508 { 509 struct ata_port *ap = link->ap; 510 struct domain_device *dev = ap->private_data; 511 struct sas_phy *local_phy = sas_get_local_phy(dev); 512 int res = 0; 513 514 if (!local_phy->enabled || test_bit(SAS_DEV_GONE, &dev->state)) 515 res = -ENOENT; 516 sas_put_local_phy(local_phy); 517 518 return res; 519 } 520 521 static struct ata_port_operations sas_sata_ops = { 522 .prereset = sas_ata_prereset, 523 .hardreset = sas_ata_hard_reset, 524 .error_handler = ata_std_error_handler, 525 .post_internal_cmd = sas_ata_post_internal, 526 .qc_defer = ata_std_qc_defer, 527 .qc_prep = ata_noop_qc_prep, 528 .qc_issue = sas_ata_qc_issue, 529 .qc_fill_rtf = sas_ata_qc_fill_rtf, 530 .port_start = ata_sas_port_start, 531 .port_stop = ata_sas_port_stop, 532 .set_dmamode = sas_ata_set_dmamode, 533 .sched_eh = sas_ata_sched_eh, 534 .end_eh = sas_ata_end_eh, 535 }; 536 537 static struct ata_port_info sata_port_info = { 538 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ | 539 ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX, 540 .pio_mask = ATA_PIO4, 541 .mwdma_mask = ATA_MWDMA2, 542 .udma_mask = ATA_UDMA6, 543 .port_ops = &sas_sata_ops 544 }; 545 546 int sas_ata_init(struct domain_device *found_dev) 547 { 548 struct sas_ha_struct *ha = found_dev->port->ha; 549 struct Scsi_Host *shost = ha->core.shost; 550 struct ata_host *ata_host; 551 struct ata_port *ap; 552 int rc; 553 554 ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL); 555 if (!ata_host) { 556 pr_err("ata host alloc failed.\n"); 557 return -ENOMEM; 558 } 559 560 ata_host_init(ata_host, ha->dev, &sas_sata_ops); 561 562 ap = ata_sas_port_alloc(ata_host, &sata_port_info, shost); 563 if (!ap) { 564 pr_err("ata_sas_port_alloc failed.\n"); 565 rc = -ENODEV; 566 goto free_host; 567 } 568 569 ap->private_data = found_dev; 570 ap->cbl = ATA_CBL_SATA; 571 ap->scsi_host = shost; 572 rc = ata_sas_port_init(ap); 573 if (rc) 574 goto destroy_port; 575 576 rc = ata_sas_tport_add(ata_host->dev, ap); 577 if (rc) 578 goto destroy_port; 579 580 found_dev->sata_dev.ata_host = ata_host; 581 found_dev->sata_dev.ap = ap; 582 583 return 0; 584 585 destroy_port: 586 ata_sas_port_destroy(ap); 587 free_host: 588 ata_host_put(ata_host); 589 return rc; 590 } 591 592 void sas_ata_task_abort(struct sas_task *task) 593 { 594 struct ata_queued_cmd *qc = task->uldd_task; 595 struct completion *waiting; 596 597 /* Bounce SCSI-initiated commands to the SCSI EH */ 598 if (qc->scsicmd) { 599 blk_abort_request(scsi_cmd_to_rq(qc->scsicmd)); 600 return; 601 } 602 603 /* Internal command, fake a timeout and complete. */ 604 qc->flags &= ~ATA_QCFLAG_ACTIVE; 605 qc->flags |= ATA_QCFLAG_FAILED; 606 qc->err_mask |= AC_ERR_TIMEOUT; 607 waiting = qc->private_data; 608 complete(waiting); 609 } 610 611 static int sas_get_ata_command_set(struct domain_device *dev) 612 { 613 struct dev_to_host_fis *fis = 614 (struct dev_to_host_fis *) dev->frame_rcvd; 615 struct ata_taskfile tf; 616 617 if (dev->dev_type == SAS_SATA_PENDING) 618 return ATA_DEV_UNKNOWN; 619 620 ata_tf_from_fis((const u8 *)fis, &tf); 621 622 return ata_dev_classify(&tf); 623 } 624 625 void sas_probe_sata(struct asd_sas_port *port) 626 { 627 struct domain_device *dev, *n; 628 629 mutex_lock(&port->ha->disco_mutex); 630 list_for_each_entry(dev, &port->disco_list, disco_list_node) { 631 if (!dev_is_sata(dev)) 632 continue; 633 634 ata_sas_async_probe(dev->sata_dev.ap); 635 } 636 mutex_unlock(&port->ha->disco_mutex); 637 638 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) { 639 if (!dev_is_sata(dev)) 640 continue; 641 642 sas_ata_wait_eh(dev); 643 644 /* if libata could not bring the link up, don't surface 645 * the device 646 */ 647 if (!ata_dev_enabled(sas_to_ata_dev(dev))) 648 sas_fail_probe(dev, __func__, -ENODEV); 649 } 650 651 } 652 653 static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func) 654 { 655 struct domain_device *dev, *n; 656 657 list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) { 658 if (!dev_is_sata(dev)) 659 continue; 660 661 sas_ata_wait_eh(dev); 662 663 /* if libata failed to power manage the device, tear it down */ 664 if (ata_dev_disabled(sas_to_ata_dev(dev))) 665 sas_fail_probe(dev, func, -ENODEV); 666 } 667 } 668 669 void sas_suspend_sata(struct asd_sas_port *port) 670 { 671 struct domain_device *dev; 672 673 mutex_lock(&port->ha->disco_mutex); 674 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 675 struct sata_device *sata; 676 677 if (!dev_is_sata(dev)) 678 continue; 679 680 sata = &dev->sata_dev; 681 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND) 682 continue; 683 684 ata_sas_port_suspend(sata->ap); 685 } 686 mutex_unlock(&port->ha->disco_mutex); 687 688 sas_ata_flush_pm_eh(port, __func__); 689 } 690 691 void sas_resume_sata(struct asd_sas_port *port) 692 { 693 struct domain_device *dev; 694 695 mutex_lock(&port->ha->disco_mutex); 696 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 697 struct sata_device *sata; 698 699 if (!dev_is_sata(dev)) 700 continue; 701 702 sata = &dev->sata_dev; 703 if (sata->ap->pm_mesg.event == PM_EVENT_ON) 704 continue; 705 706 ata_sas_port_resume(sata->ap); 707 } 708 mutex_unlock(&port->ha->disco_mutex); 709 710 sas_ata_flush_pm_eh(port, __func__); 711 } 712 713 /** 714 * sas_discover_sata - discover an STP/SATA domain device 715 * @dev: pointer to struct domain_device of interest 716 * 717 * Devices directly attached to a HA port, have no parents. All other 718 * devices do, and should have their "parent" pointer set appropriately 719 * before calling this function. 720 */ 721 int sas_discover_sata(struct domain_device *dev) 722 { 723 if (dev->dev_type == SAS_SATA_PM) 724 return -ENODEV; 725 726 dev->sata_dev.class = sas_get_ata_command_set(dev); 727 sas_fill_in_rphy(dev, dev->rphy); 728 729 return sas_notify_lldd_dev_found(dev); 730 } 731 732 static void async_sas_ata_eh(void *data, async_cookie_t cookie) 733 { 734 struct domain_device *dev = data; 735 struct ata_port *ap = dev->sata_dev.ap; 736 struct sas_ha_struct *ha = dev->port->ha; 737 738 sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n"); 739 ata_scsi_port_error_handler(ha->core.shost, ap); 740 sas_put_device(dev); 741 } 742 743 void sas_ata_strategy_handler(struct Scsi_Host *shost) 744 { 745 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 746 ASYNC_DOMAIN_EXCLUSIVE(async); 747 int i; 748 749 /* it's ok to defer revalidation events during ata eh, these 750 * disks are in one of three states: 751 * 1/ present for initial domain discovery, and these 752 * resets will cause bcn flutters 753 * 2/ hot removed, we'll discover that after eh fails 754 * 3/ hot added after initial discovery, lost the race, and need 755 * to catch the next train. 756 */ 757 sas_disable_revalidation(sas_ha); 758 759 spin_lock_irq(&sas_ha->phy_port_lock); 760 for (i = 0; i < sas_ha->num_phys; i++) { 761 struct asd_sas_port *port = sas_ha->sas_port[i]; 762 struct domain_device *dev; 763 764 spin_lock(&port->dev_list_lock); 765 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 766 if (!dev_is_sata(dev)) 767 continue; 768 769 /* hold a reference over eh since we may be 770 * racing with final remove once all commands 771 * are completed 772 */ 773 kref_get(&dev->kref); 774 775 async_schedule_domain(async_sas_ata_eh, dev, &async); 776 } 777 spin_unlock(&port->dev_list_lock); 778 } 779 spin_unlock_irq(&sas_ha->phy_port_lock); 780 781 async_synchronize_full_domain(&async); 782 783 sas_enable_revalidation(sas_ha); 784 } 785 786 void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q, 787 struct list_head *done_q) 788 { 789 struct scsi_cmnd *cmd, *n; 790 struct domain_device *eh_dev; 791 792 do { 793 LIST_HEAD(sata_q); 794 eh_dev = NULL; 795 796 list_for_each_entry_safe(cmd, n, work_q, eh_entry) { 797 struct domain_device *ddev = cmd_to_domain_dev(cmd); 798 799 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd)) 800 continue; 801 if (eh_dev && eh_dev != ddev) 802 continue; 803 eh_dev = ddev; 804 list_move(&cmd->eh_entry, &sata_q); 805 } 806 807 if (!list_empty(&sata_q)) { 808 struct ata_port *ap = eh_dev->sata_dev.ap; 809 810 sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n"); 811 ata_scsi_cmd_error_handler(shost, ap, &sata_q); 812 /* 813 * ata's error handler may leave the cmd on the list 814 * so make sure they don't remain on a stack list 815 * about to go out of scope. 816 * 817 * This looks strange, since the commands are 818 * now part of no list, but the next error 819 * action will be ata_port_error_handler() 820 * which takes no list and sweeps them up 821 * anyway from the ata tag array. 822 */ 823 while (!list_empty(&sata_q)) 824 list_del_init(sata_q.next); 825 } 826 } while (eh_dev); 827 } 828 829 void sas_ata_schedule_reset(struct domain_device *dev) 830 { 831 struct ata_eh_info *ehi; 832 struct ata_port *ap; 833 unsigned long flags; 834 835 if (!dev_is_sata(dev)) 836 return; 837 838 ap = dev->sata_dev.ap; 839 ehi = &ap->link.eh_info; 840 841 spin_lock_irqsave(ap->lock, flags); 842 ehi->err_mask |= AC_ERR_TIMEOUT; 843 ehi->action |= ATA_EH_RESET; 844 ata_port_schedule_eh(ap); 845 spin_unlock_irqrestore(ap->lock, flags); 846 } 847 EXPORT_SYMBOL_GPL(sas_ata_schedule_reset); 848 849 void sas_ata_wait_eh(struct domain_device *dev) 850 { 851 struct ata_port *ap; 852 853 if (!dev_is_sata(dev)) 854 return; 855 856 ap = dev->sata_dev.ap; 857 ata_port_wait_eh(ap); 858 } 859