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_OPEN_TO: 56 case SAS_OPEN_REJECT: 57 pr_warn("%s: Saw error %d. What to do?\n", 58 __func__, ts->stat); 59 return AC_ERR_OTHER; 60 case SAM_STAT_CHECK_CONDITION: 61 case SAS_ABORTED_TASK: 62 return AC_ERR_DEV; 63 case SAS_PROTO_RESPONSE: 64 /* This means the ending_fis has the error 65 * value; return 0 here to collect it 66 */ 67 return 0; 68 default: 69 return 0; 70 } 71 } 72 73 static void sas_ata_task_done(struct sas_task *task) 74 { 75 struct ata_queued_cmd *qc = task->uldd_task; 76 struct domain_device *dev = task->dev; 77 struct task_status_struct *stat = &task->task_status; 78 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf; 79 struct sas_ha_struct *sas_ha = dev->port->ha; 80 enum ata_completion_errors ac; 81 unsigned long flags; 82 struct ata_link *link; 83 struct ata_port *ap; 84 85 spin_lock_irqsave(&dev->done_lock, flags); 86 if (test_bit(SAS_HA_FROZEN, &sas_ha->state)) 87 task = NULL; 88 else if (qc && qc->scsicmd) 89 ASSIGN_SAS_TASK(qc->scsicmd, NULL); 90 spin_unlock_irqrestore(&dev->done_lock, flags); 91 92 /* check if libsas-eh got to the task before us */ 93 if (unlikely(!task)) 94 return; 95 96 if (!qc) 97 goto qc_already_gone; 98 99 ap = qc->ap; 100 link = &ap->link; 101 102 spin_lock_irqsave(ap->lock, flags); 103 /* check if we lost the race with libata/sas_ata_post_internal() */ 104 if (unlikely(ata_port_is_frozen(ap))) { 105 spin_unlock_irqrestore(ap->lock, flags); 106 if (qc->scsicmd) 107 goto qc_already_gone; 108 else { 109 /* if eh is not involved and the port is frozen then the 110 * ata internal abort process has taken responsibility 111 * for this sas_task 112 */ 113 return; 114 } 115 } 116 117 if (stat->stat == SAS_PROTO_RESPONSE || 118 stat->stat == SAS_SAM_STAT_GOOD || 119 (stat->stat == SAS_SAM_STAT_CHECK_CONDITION && 120 dev->sata_dev.class == ATA_DEV_ATAPI)) { 121 memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE); 122 123 if (!link->sactive) { 124 qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]); 125 } else { 126 link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]); 127 if (unlikely(link->eh_info.err_mask)) 128 qc->flags |= ATA_QCFLAG_EH; 129 } 130 } else { 131 ac = sas_to_ata_err(stat); 132 if (ac) { 133 pr_warn("%s: SAS error 0x%x\n", __func__, stat->stat); 134 /* We saw a SAS error. Send a vague error. */ 135 if (!link->sactive) { 136 qc->err_mask = ac; 137 } else { 138 link->eh_info.err_mask |= AC_ERR_DEV; 139 qc->flags |= ATA_QCFLAG_EH; 140 } 141 142 dev->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */ 143 dev->sata_dev.fis[3] = ATA_ABORTED; /* tf error */ 144 } 145 } 146 147 qc->lldd_task = NULL; 148 ata_qc_complete(qc); 149 spin_unlock_irqrestore(ap->lock, flags); 150 151 qc_already_gone: 152 sas_free_task(task); 153 } 154 155 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) 156 __must_hold(ap->lock) 157 { 158 struct sas_task *task; 159 struct scatterlist *sg; 160 int ret = AC_ERR_SYSTEM; 161 unsigned int si, xfer = 0; 162 struct ata_port *ap = qc->ap; 163 struct domain_device *dev = ap->private_data; 164 struct sas_ha_struct *sas_ha = dev->port->ha; 165 struct Scsi_Host *host = sas_ha->shost; 166 struct sas_internal *i = to_sas_internal(host->transportt); 167 168 /* TODO: we should try to remove that unlock */ 169 spin_unlock(ap->lock); 170 171 /* If the device fell off, no sense in issuing commands */ 172 if (test_bit(SAS_DEV_GONE, &dev->state)) 173 goto out; 174 175 task = sas_alloc_task(GFP_ATOMIC); 176 if (!task) 177 goto out; 178 task->dev = dev; 179 task->task_proto = SAS_PROTOCOL_STP; 180 task->task_done = sas_ata_task_done; 181 182 /* For NCQ commands, zero out the tag libata assigned us */ 183 if (ata_is_ncq(qc->tf.protocol)) 184 qc->tf.nsect = 0; 185 186 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis); 187 task->uldd_task = qc; 188 if (ata_is_atapi(qc->tf.protocol)) { 189 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len); 190 task->total_xfer_len = qc->nbytes; 191 task->num_scatter = qc->n_elem; 192 task->data_dir = qc->dma_dir; 193 } else if (!ata_is_data(qc->tf.protocol)) { 194 task->data_dir = DMA_NONE; 195 } else { 196 for_each_sg(qc->sg, sg, qc->n_elem, si) 197 xfer += sg_dma_len(sg); 198 199 task->total_xfer_len = xfer; 200 task->num_scatter = si; 201 task->data_dir = qc->dma_dir; 202 } 203 task->scatter = qc->sg; 204 qc->lldd_task = task; 205 206 task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol); 207 task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol); 208 209 if (qc->flags & ATA_QCFLAG_RESULT_TF) 210 task->ata_task.return_fis_on_success = 1; 211 212 if (qc->scsicmd) 213 ASSIGN_SAS_TASK(qc->scsicmd, task); 214 215 ret = i->dft->lldd_execute_task(task, GFP_ATOMIC); 216 if (ret) { 217 pr_debug("lldd_execute_task returned: %d\n", ret); 218 219 if (qc->scsicmd) 220 ASSIGN_SAS_TASK(qc->scsicmd, NULL); 221 sas_free_task(task); 222 qc->lldd_task = NULL; 223 ret = AC_ERR_SYSTEM; 224 } 225 226 out: 227 spin_lock(ap->lock); 228 return ret; 229 } 230 231 static void sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc) 232 { 233 struct domain_device *dev = qc->ap->private_data; 234 235 ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf); 236 } 237 238 static struct sas_internal *dev_to_sas_internal(struct domain_device *dev) 239 { 240 return to_sas_internal(dev->port->ha->shost->transportt); 241 } 242 243 static int sas_get_ata_command_set(struct domain_device *dev) 244 { 245 struct ata_taskfile tf; 246 247 if (dev->dev_type == SAS_SATA_PENDING) 248 return ATA_DEV_UNKNOWN; 249 250 ata_tf_from_fis(dev->frame_rcvd, &tf); 251 252 return ata_dev_classify(&tf); 253 } 254 255 int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy) 256 { 257 if (phy->attached_tproto & SAS_PROTOCOL_STP) 258 dev->tproto = phy->attached_tproto; 259 if (phy->attached_sata_dev) 260 dev->tproto |= SAS_SATA_DEV; 261 262 if (phy->attached_dev_type == SAS_SATA_PENDING) 263 dev->dev_type = SAS_SATA_PENDING; 264 else { 265 int res; 266 267 dev->dev_type = SAS_SATA_DEV; 268 res = sas_get_report_phy_sata(dev->parent, phy->phy_id, 269 &dev->sata_dev.rps_resp); 270 if (res) { 271 pr_debug("report phy sata to %016llx:%02d returned 0x%x\n", 272 SAS_ADDR(dev->parent->sas_addr), 273 phy->phy_id, res); 274 return res; 275 } 276 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis, 277 sizeof(struct dev_to_host_fis)); 278 dev->sata_dev.class = sas_get_ata_command_set(dev); 279 } 280 return 0; 281 } 282 283 static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy) 284 { 285 int res; 286 287 /* we weren't pending, so successfully end the reset sequence now */ 288 if (dev->dev_type != SAS_SATA_PENDING) 289 return 1; 290 291 /* hmmm, if this succeeds do we need to repost the domain_device to the 292 * lldd so it can pick up new parameters? 293 */ 294 res = sas_get_ata_info(dev, phy); 295 if (res) 296 return 0; /* retry */ 297 else 298 return 1; 299 } 300 301 int smp_ata_check_ready_type(struct ata_link *link) 302 { 303 struct domain_device *dev = link->ap->private_data; 304 struct sas_phy *phy = sas_get_local_phy(dev); 305 struct domain_device *ex_dev = dev->parent; 306 enum sas_device_type type = SAS_PHY_UNUSED; 307 u8 sas_addr[SAS_ADDR_SIZE]; 308 int res; 309 310 res = sas_get_phy_attached_dev(ex_dev, phy->number, sas_addr, &type); 311 sas_put_local_phy(phy); 312 if (res) 313 return res; 314 315 switch (type) { 316 case SAS_SATA_PENDING: 317 return 0; 318 case SAS_END_DEVICE: 319 return 1; 320 default: 321 return -ENODEV; 322 } 323 } 324 EXPORT_SYMBOL_GPL(smp_ata_check_ready_type); 325 326 static int smp_ata_check_ready(struct ata_link *link) 327 { 328 int res; 329 struct ata_port *ap = link->ap; 330 struct domain_device *dev = ap->private_data; 331 struct domain_device *ex_dev = dev->parent; 332 struct sas_phy *phy = sas_get_local_phy(dev); 333 struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number]; 334 335 res = sas_ex_phy_discover(ex_dev, phy->number); 336 sas_put_local_phy(phy); 337 338 /* break the wait early if the expander is unreachable, 339 * otherwise keep polling 340 */ 341 if (res == -ECOMM) 342 return res; 343 if (res != SMP_RESP_FUNC_ACC) 344 return 0; 345 346 switch (ex_phy->attached_dev_type) { 347 case SAS_SATA_PENDING: 348 return 0; 349 case SAS_END_DEVICE: 350 if (ex_phy->attached_sata_dev) 351 return sas_ata_clear_pending(dev, ex_phy); 352 fallthrough; 353 default: 354 return -ENODEV; 355 } 356 } 357 358 static int local_ata_check_ready(struct ata_link *link) 359 { 360 struct ata_port *ap = link->ap; 361 struct domain_device *dev = ap->private_data; 362 struct sas_internal *i = dev_to_sas_internal(dev); 363 364 if (i->dft->lldd_ata_check_ready) 365 return i->dft->lldd_ata_check_ready(dev); 366 else { 367 /* lldd's that don't implement 'ready' checking get the 368 * old default behavior of not coordinating reset 369 * recovery with libata 370 */ 371 return 1; 372 } 373 } 374 375 static int sas_ata_printk(const char *level, const struct domain_device *ddev, 376 const char *fmt, ...) 377 { 378 struct ata_port *ap = ddev->sata_dev.ap; 379 struct device *dev = &ddev->rphy->dev; 380 struct va_format vaf; 381 va_list args; 382 int r; 383 384 va_start(args, fmt); 385 386 vaf.fmt = fmt; 387 vaf.va = &args; 388 389 r = printk("%s" SAS_FMT "ata%u: %s: %pV", 390 level, ap->print_id, dev_name(dev), &vaf); 391 392 va_end(args); 393 394 return r; 395 } 396 397 static int sas_ata_wait_after_reset(struct domain_device *dev, unsigned long deadline) 398 { 399 struct sata_device *sata_dev = &dev->sata_dev; 400 int (*check_ready)(struct ata_link *link); 401 struct ata_port *ap = sata_dev->ap; 402 struct ata_link *link = &ap->link; 403 struct sas_phy *phy; 404 int ret; 405 406 phy = sas_get_local_phy(dev); 407 if (scsi_is_sas_phy_local(phy)) 408 check_ready = local_ata_check_ready; 409 else 410 check_ready = smp_ata_check_ready; 411 sas_put_local_phy(phy); 412 413 ret = ata_wait_after_reset(link, deadline, check_ready); 414 if (ret && ret != -EAGAIN) 415 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret); 416 417 return ret; 418 } 419 420 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class, 421 unsigned long deadline) 422 { 423 struct ata_port *ap = link->ap; 424 struct domain_device *dev = ap->private_data; 425 struct sas_internal *i = dev_to_sas_internal(dev); 426 int ret; 427 428 ret = i->dft->lldd_I_T_nexus_reset(dev); 429 if (ret == -ENODEV) 430 return ret; 431 432 if (ret != TMF_RESP_FUNC_COMPLETE) 433 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n"); 434 435 ret = sas_ata_wait_after_reset(dev, deadline); 436 437 *class = dev->sata_dev.class; 438 439 ap->cbl = ATA_CBL_SATA; 440 return ret; 441 } 442 443 /* 444 * notify the lldd to forget the sas_task for this internal ata command 445 * that bypasses scsi-eh 446 */ 447 static void sas_ata_internal_abort(struct sas_task *task) 448 { 449 struct sas_internal *si = dev_to_sas_internal(task->dev); 450 unsigned long flags; 451 int res; 452 453 spin_lock_irqsave(&task->task_state_lock, flags); 454 if (task->task_state_flags & SAS_TASK_STATE_ABORTED || 455 task->task_state_flags & SAS_TASK_STATE_DONE) { 456 spin_unlock_irqrestore(&task->task_state_lock, flags); 457 pr_debug("%s: Task %p already finished.\n", __func__, task); 458 goto out; 459 } 460 task->task_state_flags |= SAS_TASK_STATE_ABORTED; 461 spin_unlock_irqrestore(&task->task_state_lock, flags); 462 463 res = si->dft->lldd_abort_task(task); 464 465 spin_lock_irqsave(&task->task_state_lock, flags); 466 if (task->task_state_flags & SAS_TASK_STATE_DONE || 467 res == TMF_RESP_FUNC_COMPLETE) { 468 spin_unlock_irqrestore(&task->task_state_lock, flags); 469 goto out; 470 } 471 472 /* XXX we are not prepared to deal with ->lldd_abort_task() 473 * failures. TODO: lldds need to unconditionally forget about 474 * aborted ata tasks, otherwise we (likely) leak the sas task 475 * here 476 */ 477 pr_warn("%s: Task %p leaked.\n", __func__, task); 478 479 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) 480 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED; 481 spin_unlock_irqrestore(&task->task_state_lock, flags); 482 483 return; 484 out: 485 sas_free_task(task); 486 } 487 488 static void sas_ata_post_internal(struct ata_queued_cmd *qc) 489 { 490 if (qc->flags & ATA_QCFLAG_EH) 491 qc->err_mask |= AC_ERR_OTHER; 492 493 if (qc->err_mask) { 494 /* 495 * Find the sas_task and kill it. By this point, libata 496 * has decided to kill the qc and has frozen the port. 497 * In this state sas_ata_task_done() will no longer free 498 * the sas_task, so we need to notify the lldd (via 499 * ->lldd_abort_task) that the task is dead and free it 500 * ourselves. 501 */ 502 struct sas_task *task = qc->lldd_task; 503 504 qc->lldd_task = NULL; 505 if (!task) 506 return; 507 task->uldd_task = NULL; 508 sas_ata_internal_abort(task); 509 } 510 } 511 512 513 static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev) 514 { 515 struct domain_device *dev = ap->private_data; 516 struct sas_internal *i = dev_to_sas_internal(dev); 517 518 if (i->dft->lldd_ata_set_dmamode) 519 i->dft->lldd_ata_set_dmamode(dev); 520 } 521 522 static void sas_ata_sched_eh(struct ata_port *ap) 523 { 524 struct domain_device *dev = ap->private_data; 525 struct sas_ha_struct *ha = dev->port->ha; 526 unsigned long flags; 527 528 spin_lock_irqsave(&ha->lock, flags); 529 if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state)) 530 ha->eh_active++; 531 ata_std_sched_eh(ap); 532 spin_unlock_irqrestore(&ha->lock, flags); 533 } 534 535 void sas_ata_end_eh(struct ata_port *ap) 536 { 537 struct domain_device *dev = ap->private_data; 538 struct sas_ha_struct *ha = dev->port->ha; 539 unsigned long flags; 540 541 spin_lock_irqsave(&ha->lock, flags); 542 if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state)) 543 ha->eh_active--; 544 spin_unlock_irqrestore(&ha->lock, flags); 545 } 546 547 static int sas_ata_prereset(struct ata_link *link, unsigned long deadline) 548 { 549 struct ata_port *ap = link->ap; 550 struct domain_device *dev = ap->private_data; 551 struct sas_phy *local_phy = sas_get_local_phy(dev); 552 int res = 0; 553 554 if (!local_phy->enabled || test_bit(SAS_DEV_GONE, &dev->state)) 555 res = -ENOENT; 556 sas_put_local_phy(local_phy); 557 558 return res; 559 } 560 561 static struct ata_port_operations sas_sata_ops = { 562 .prereset = sas_ata_prereset, 563 .hardreset = sas_ata_hard_reset, 564 .error_handler = ata_std_error_handler, 565 .post_internal_cmd = sas_ata_post_internal, 566 .qc_defer = ata_std_qc_defer, 567 .qc_prep = ata_noop_qc_prep, 568 .qc_issue = sas_ata_qc_issue, 569 .qc_fill_rtf = sas_ata_qc_fill_rtf, 570 .set_dmamode = sas_ata_set_dmamode, 571 .sched_eh = sas_ata_sched_eh, 572 .end_eh = sas_ata_end_eh, 573 }; 574 575 static struct ata_port_info sata_port_info = { 576 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ | 577 ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX, 578 .pio_mask = ATA_PIO4, 579 .mwdma_mask = ATA_MWDMA2, 580 .udma_mask = ATA_UDMA6, 581 .port_ops = &sas_sata_ops 582 }; 583 584 int sas_ata_init(struct domain_device *found_dev) 585 { 586 struct sas_ha_struct *ha = found_dev->port->ha; 587 struct Scsi_Host *shost = ha->shost; 588 struct ata_host *ata_host; 589 struct ata_port *ap; 590 int rc; 591 592 ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL); 593 if (!ata_host) { 594 pr_err("ata host alloc failed.\n"); 595 return -ENOMEM; 596 } 597 598 ata_host_init(ata_host, ha->dev, &sas_sata_ops); 599 600 ap = ata_sas_port_alloc(ata_host, &sata_port_info, shost); 601 if (!ap) { 602 pr_err("ata_sas_port_alloc failed.\n"); 603 rc = -ENODEV; 604 goto free_host; 605 } 606 607 ap->private_data = found_dev; 608 ap->cbl = ATA_CBL_SATA; 609 ap->scsi_host = shost; 610 611 rc = ata_sas_tport_add(ata_host->dev, ap); 612 if (rc) 613 goto destroy_port; 614 615 found_dev->sata_dev.ata_host = ata_host; 616 found_dev->sata_dev.ap = ap; 617 618 return 0; 619 620 destroy_port: 621 kfree(ap); 622 free_host: 623 ata_host_put(ata_host); 624 return rc; 625 } 626 627 void sas_ata_task_abort(struct sas_task *task) 628 { 629 struct ata_queued_cmd *qc = task->uldd_task; 630 struct completion *waiting; 631 632 /* Bounce SCSI-initiated commands to the SCSI EH */ 633 if (qc->scsicmd) { 634 blk_abort_request(scsi_cmd_to_rq(qc->scsicmd)); 635 return; 636 } 637 638 /* Internal command, fake a timeout and complete. */ 639 qc->flags &= ~ATA_QCFLAG_ACTIVE; 640 qc->flags |= ATA_QCFLAG_EH; 641 qc->err_mask |= AC_ERR_TIMEOUT; 642 waiting = qc->private_data; 643 complete(waiting); 644 } 645 646 void sas_probe_sata(struct asd_sas_port *port) 647 { 648 struct domain_device *dev, *n; 649 650 mutex_lock(&port->ha->disco_mutex); 651 list_for_each_entry(dev, &port->disco_list, disco_list_node) { 652 if (!dev_is_sata(dev)) 653 continue; 654 655 ata_port_probe(dev->sata_dev.ap); 656 } 657 mutex_unlock(&port->ha->disco_mutex); 658 659 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) { 660 if (!dev_is_sata(dev)) 661 continue; 662 663 sas_ata_wait_eh(dev); 664 665 /* if libata could not bring the link up, don't surface 666 * the device 667 */ 668 if (!ata_dev_enabled(sas_to_ata_dev(dev))) 669 sas_fail_probe(dev, __func__, -ENODEV); 670 } 671 672 } 673 674 int sas_ata_add_dev(struct domain_device *parent, struct ex_phy *phy, 675 struct domain_device *child, int phy_id) 676 { 677 struct sas_rphy *rphy; 678 int ret; 679 680 if (child->linkrate > parent->min_linkrate) { 681 struct sas_phy *cphy = child->phy; 682 enum sas_linkrate min_prate = cphy->minimum_linkrate, 683 parent_min_lrate = parent->min_linkrate, 684 min_linkrate = (min_prate > parent_min_lrate) ? 685 parent_min_lrate : 0; 686 struct sas_phy_linkrates rates = { 687 .maximum_linkrate = parent->min_linkrate, 688 .minimum_linkrate = min_linkrate, 689 }; 690 691 pr_notice("ex %016llx phy%02d SATA device linkrate > min pathway connection rate, attempting to lower device linkrate\n", 692 SAS_ADDR(child->sas_addr), phy_id); 693 ret = sas_smp_phy_control(parent, phy_id, 694 PHY_FUNC_LINK_RESET, &rates); 695 if (ret) { 696 pr_err("ex %016llx phy%02d SATA device could not set linkrate (%d)\n", 697 SAS_ADDR(child->sas_addr), phy_id, ret); 698 return ret; 699 } 700 pr_notice("ex %016llx phy%02d SATA device set linkrate successfully\n", 701 SAS_ADDR(child->sas_addr), phy_id); 702 child->linkrate = child->min_linkrate; 703 } 704 ret = sas_get_ata_info(child, phy); 705 if (ret) 706 return ret; 707 708 sas_init_dev(child); 709 ret = sas_ata_init(child); 710 if (ret) 711 return ret; 712 713 rphy = sas_end_device_alloc(phy->port); 714 if (!rphy) 715 return -ENOMEM; 716 717 rphy->identify.phy_identifier = phy_id; 718 child->rphy = rphy; 719 get_device(&rphy->dev); 720 721 list_add_tail(&child->disco_list_node, &parent->port->disco_list); 722 723 ret = sas_discover_sata(child); 724 if (ret) { 725 pr_notice("sas_discover_sata() for device %16llx at %016llx:%02d returned 0x%x\n", 726 SAS_ADDR(child->sas_addr), 727 SAS_ADDR(parent->sas_addr), phy_id, ret); 728 sas_rphy_free(child->rphy); 729 list_del(&child->disco_list_node); 730 return ret; 731 } 732 733 return 0; 734 } 735 736 static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func) 737 { 738 struct domain_device *dev, *n; 739 740 list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) { 741 if (!dev_is_sata(dev)) 742 continue; 743 744 sas_ata_wait_eh(dev); 745 746 /* if libata failed to power manage the device, tear it down */ 747 if (ata_dev_disabled(sas_to_ata_dev(dev))) 748 sas_fail_probe(dev, func, -ENODEV); 749 } 750 } 751 752 void sas_suspend_sata(struct asd_sas_port *port) 753 { 754 struct domain_device *dev; 755 756 mutex_lock(&port->ha->disco_mutex); 757 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 758 struct sata_device *sata; 759 760 if (!dev_is_sata(dev)) 761 continue; 762 763 sata = &dev->sata_dev; 764 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND) 765 continue; 766 767 ata_sas_port_suspend(sata->ap); 768 } 769 mutex_unlock(&port->ha->disco_mutex); 770 771 sas_ata_flush_pm_eh(port, __func__); 772 } 773 774 void sas_resume_sata(struct asd_sas_port *port) 775 { 776 struct domain_device *dev; 777 778 mutex_lock(&port->ha->disco_mutex); 779 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 780 struct sata_device *sata; 781 782 if (!dev_is_sata(dev)) 783 continue; 784 785 sata = &dev->sata_dev; 786 if (sata->ap->pm_mesg.event == PM_EVENT_ON) 787 continue; 788 789 ata_sas_port_resume(sata->ap); 790 } 791 mutex_unlock(&port->ha->disco_mutex); 792 793 sas_ata_flush_pm_eh(port, __func__); 794 } 795 796 /** 797 * sas_discover_sata - discover an STP/SATA domain device 798 * @dev: pointer to struct domain_device of interest 799 * 800 * Devices directly attached to a HA port, have no parents. All other 801 * devices do, and should have their "parent" pointer set appropriately 802 * before calling this function. 803 */ 804 int sas_discover_sata(struct domain_device *dev) 805 { 806 if (dev->dev_type == SAS_SATA_PM) 807 return -ENODEV; 808 809 dev->sata_dev.class = sas_get_ata_command_set(dev); 810 sas_fill_in_rphy(dev, dev->rphy); 811 812 return sas_notify_lldd_dev_found(dev); 813 } 814 815 static void async_sas_ata_eh(void *data, async_cookie_t cookie) 816 { 817 struct domain_device *dev = data; 818 struct ata_port *ap = dev->sata_dev.ap; 819 struct sas_ha_struct *ha = dev->port->ha; 820 821 sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n"); 822 ata_scsi_port_error_handler(ha->shost, ap); 823 sas_put_device(dev); 824 } 825 826 void sas_ata_strategy_handler(struct Scsi_Host *shost) 827 { 828 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 829 ASYNC_DOMAIN_EXCLUSIVE(async); 830 int i; 831 832 /* it's ok to defer revalidation events during ata eh, these 833 * disks are in one of three states: 834 * 1/ present for initial domain discovery, and these 835 * resets will cause bcn flutters 836 * 2/ hot removed, we'll discover that after eh fails 837 * 3/ hot added after initial discovery, lost the race, and need 838 * to catch the next train. 839 */ 840 sas_disable_revalidation(sas_ha); 841 842 spin_lock_irq(&sas_ha->phy_port_lock); 843 for (i = 0; i < sas_ha->num_phys; i++) { 844 struct asd_sas_port *port = sas_ha->sas_port[i]; 845 struct domain_device *dev; 846 847 spin_lock(&port->dev_list_lock); 848 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 849 if (!dev_is_sata(dev)) 850 continue; 851 852 /* hold a reference over eh since we may be 853 * racing with final remove once all commands 854 * are completed 855 */ 856 kref_get(&dev->kref); 857 858 async_schedule_domain(async_sas_ata_eh, dev, &async); 859 } 860 spin_unlock(&port->dev_list_lock); 861 } 862 spin_unlock_irq(&sas_ha->phy_port_lock); 863 864 async_synchronize_full_domain(&async); 865 866 sas_enable_revalidation(sas_ha); 867 } 868 869 void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q) 870 { 871 struct scsi_cmnd *cmd, *n; 872 struct domain_device *eh_dev; 873 874 do { 875 LIST_HEAD(sata_q); 876 eh_dev = NULL; 877 878 list_for_each_entry_safe(cmd, n, work_q, eh_entry) { 879 struct domain_device *ddev = cmd_to_domain_dev(cmd); 880 881 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd)) 882 continue; 883 if (eh_dev && eh_dev != ddev) 884 continue; 885 eh_dev = ddev; 886 list_move(&cmd->eh_entry, &sata_q); 887 } 888 889 if (!list_empty(&sata_q)) { 890 struct ata_port *ap = eh_dev->sata_dev.ap; 891 892 sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n"); 893 ata_scsi_cmd_error_handler(shost, ap, &sata_q); 894 /* 895 * ata's error handler may leave the cmd on the list 896 * so make sure they don't remain on a stack list 897 * about to go out of scope. 898 * 899 * This looks strange, since the commands are 900 * now part of no list, but the next error 901 * action will be ata_port_error_handler() 902 * which takes no list and sweeps them up 903 * anyway from the ata tag array. 904 */ 905 while (!list_empty(&sata_q)) 906 list_del_init(sata_q.next); 907 } 908 } while (eh_dev); 909 } 910 911 void sas_ata_schedule_reset(struct domain_device *dev) 912 { 913 struct ata_eh_info *ehi; 914 struct ata_port *ap; 915 unsigned long flags; 916 917 if (!dev_is_sata(dev)) 918 return; 919 920 ap = dev->sata_dev.ap; 921 ehi = &ap->link.eh_info; 922 923 spin_lock_irqsave(ap->lock, flags); 924 ehi->err_mask |= AC_ERR_TIMEOUT; 925 ehi->action |= ATA_EH_RESET; 926 ata_port_schedule_eh(ap); 927 spin_unlock_irqrestore(ap->lock, flags); 928 } 929 EXPORT_SYMBOL_GPL(sas_ata_schedule_reset); 930 931 void sas_ata_wait_eh(struct domain_device *dev) 932 { 933 struct ata_port *ap; 934 935 if (!dev_is_sata(dev)) 936 return; 937 938 ap = dev->sata_dev.ap; 939 ata_port_wait_eh(ap); 940 } 941 942 void sas_ata_device_link_abort(struct domain_device *device, bool force_reset) 943 { 944 struct ata_port *ap = device->sata_dev.ap; 945 struct ata_link *link = &ap->link; 946 unsigned long flags; 947 948 spin_lock_irqsave(ap->lock, flags); 949 device->sata_dev.fis[2] = ATA_ERR | ATA_DRDY; /* tf status */ 950 device->sata_dev.fis[3] = ATA_ABORTED; /* tf error */ 951 952 link->eh_info.err_mask |= AC_ERR_DEV; 953 if (force_reset) 954 link->eh_info.action |= ATA_EH_RESET; 955 ata_link_abort(link); 956 spin_unlock_irqrestore(ap->lock, flags); 957 } 958 EXPORT_SYMBOL_GPL(sas_ata_device_link_abort); 959 960 int sas_execute_ata_cmd(struct domain_device *device, u8 *fis, int force_phy_id) 961 { 962 struct sas_tmf_task tmf_task = {}; 963 return sas_execute_tmf(device, fis, sizeof(struct host_to_dev_fis), 964 force_phy_id, &tmf_task); 965 } 966 EXPORT_SYMBOL_GPL(sas_execute_ata_cmd); 967