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 41 case SAS_INTERRUPTED: 42 case SAS_PHY_DOWN: 43 case SAS_NAK_R_ERR: 44 return AC_ERR_ATA_BUS; 45 46 47 case SAS_DATA_UNDERRUN: 48 /* 49 * Some programs that use the taskfile interface 50 * (smartctl in particular) can cause underrun 51 * problems. Ignore these errors, perhaps at our 52 * peril. 53 */ 54 return 0; 55 56 case SAS_DATA_OVERRUN: 57 case SAS_QUEUE_FULL: 58 case SAS_DEVICE_UNKNOWN: 59 case SAS_SG_ERR: 60 return AC_ERR_INVALID; 61 62 case SAS_OPEN_TO: 63 case SAS_OPEN_REJECT: 64 pr_warn("%s: Saw error %d. What to do?\n", 65 __func__, ts->stat); 66 return AC_ERR_OTHER; 67 68 case SAM_STAT_CHECK_CONDITION: 69 case SAS_ABORTED_TASK: 70 return AC_ERR_DEV; 71 72 case SAS_PROTO_RESPONSE: 73 /* This means the ending_fis has the error 74 * value; return 0 here to collect it */ 75 return 0; 76 default: 77 return 0; 78 } 79} 80 81static void sas_ata_task_done(struct sas_task *task) 82{ 83 struct ata_queued_cmd *qc = task->uldd_task; 84 struct domain_device *dev = task->dev; 85 struct task_status_struct *stat = &task->task_status; 86 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf; 87 struct sas_ha_struct *sas_ha = dev->port->ha; 88 enum ata_completion_errors ac; 89 unsigned long flags; 90 struct ata_link *link; 91 struct ata_port *ap; 92 93 spin_lock_irqsave(&dev->done_lock, flags); 94 if (test_bit(SAS_HA_FROZEN, &sas_ha->state)) 95 task = NULL; 96 else if (qc && qc->scsicmd) 97 ASSIGN_SAS_TASK(qc->scsicmd, NULL); 98 spin_unlock_irqrestore(&dev->done_lock, flags); 99 100 /* check if libsas-eh got to the task before us */ 101 if (unlikely(!task)) 102 return; 103 104 if (!qc) 105 goto qc_already_gone; 106 107 ap = qc->ap; 108 link = &ap->link; 109 110 spin_lock_irqsave(ap->lock, flags); 111 /* check if we lost the race with libata/sas_ata_post_internal() */ 112 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) { 113 spin_unlock_irqrestore(ap->lock, flags); 114 if (qc->scsicmd) 115 goto qc_already_gone; 116 else { 117 /* if eh is not involved and the port is frozen then the 118 * ata internal abort process has taken responsibility 119 * for this sas_task 120 */ 121 return; 122 } 123 } 124 125 if (stat->stat == SAS_PROTO_RESPONSE || 126 stat->stat == SAS_SAM_STAT_GOOD || 127 (stat->stat == SAS_SAM_STAT_CHECK_CONDITION && 128 dev->sata_dev.class == ATA_DEV_ATAPI)) { 129 memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE); 130 131 if (!link->sactive) { 132 qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]); 133 } else { 134 link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]); 135 if (unlikely(link->eh_info.err_mask)) 136 qc->flags |= ATA_QCFLAG_FAILED; 137 } 138 } else { 139 ac = sas_to_ata_err(stat); 140 if (ac) { 141 pr_warn("%s: SAS error 0x%x\n", __func__, stat->stat); 142 /* We saw a SAS error. Send a vague error. */ 143 if (!link->sactive) { 144 qc->err_mask = ac; 145 } else { 146 link->eh_info.err_mask |= AC_ERR_DEV; 147 qc->flags |= ATA_QCFLAG_FAILED; 148 } 149 150 dev->sata_dev.fis[3] = 0x04; /* status err */ 151 dev->sata_dev.fis[2] = ATA_ERR; 152 } 153 } 154 155 qc->lldd_task = NULL; 156 ata_qc_complete(qc); 157 spin_unlock_irqrestore(ap->lock, flags); 158 159qc_already_gone: 160 sas_free_task(task); 161} 162 163static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) 164 __must_hold(ap->lock) 165{ 166 struct sas_task *task; 167 struct scatterlist *sg; 168 int ret = AC_ERR_SYSTEM; 169 unsigned int si, xfer = 0; 170 struct ata_port *ap = qc->ap; 171 struct domain_device *dev = ap->private_data; 172 struct sas_ha_struct *sas_ha = dev->port->ha; 173 struct Scsi_Host *host = sas_ha->core.shost; 174 struct sas_internal *i = to_sas_internal(host->transportt); 175 176 /* TODO: we should try to remove that unlock */ 177 spin_unlock(ap->lock); 178 179 /* If the device fell off, no sense in issuing commands */ 180 if (test_bit(SAS_DEV_GONE, &dev->state)) 181 goto out; 182 183 task = sas_alloc_task(GFP_ATOMIC); 184 if (!task) 185 goto out; 186 task->dev = dev; 187 task->task_proto = SAS_PROTOCOL_STP; 188 task->task_done = sas_ata_task_done; 189 190 if (qc->tf.command == ATA_CMD_FPDMA_WRITE || 191 qc->tf.command == ATA_CMD_FPDMA_READ || 192 qc->tf.command == ATA_CMD_FPDMA_RECV || 193 qc->tf.command == ATA_CMD_FPDMA_SEND || 194 qc->tf.command == ATA_CMD_NCQ_NON_DATA) { 195 /* Need to zero out the tag libata assigned us */ 196 qc->tf.nsect = 0; 197 } 198 199 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis); 200 task->uldd_task = qc; 201 if (ata_is_atapi(qc->tf.protocol)) { 202 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len); 203 task->total_xfer_len = qc->nbytes; 204 task->num_scatter = qc->n_elem; 205 task->data_dir = qc->dma_dir; 206 } else if (!ata_is_data(qc->tf.protocol)) { 207 task->data_dir = DMA_NONE; 208 } else { 209 for_each_sg(qc->sg, sg, qc->n_elem, si) 210 xfer += sg_dma_len(sg); 211 212 task->total_xfer_len = xfer; 213 task->num_scatter = si; 214 task->data_dir = qc->dma_dir; 215 } 216 task->scatter = qc->sg; 217 task->ata_task.retry_count = 1; 218 task->task_state_flags = SAS_TASK_STATE_PENDING; 219 qc->lldd_task = task; 220 221 task->ata_task.use_ncq = ata_is_ncq(qc->tf.protocol); 222 task->ata_task.dma_xfer = ata_is_dma(qc->tf.protocol); 223 224 if (qc->scsicmd) 225 ASSIGN_SAS_TASK(qc->scsicmd, task); 226 227 ret = i->dft->lldd_execute_task(task, GFP_ATOMIC); 228 if (ret) { 229 pr_debug("lldd_execute_task returned: %d\n", ret); 230 231 if (qc->scsicmd) 232 ASSIGN_SAS_TASK(qc->scsicmd, NULL); 233 sas_free_task(task); 234 qc->lldd_task = NULL; 235 ret = AC_ERR_SYSTEM; 236 } 237 238 out: 239 spin_lock(ap->lock); 240 return ret; 241} 242 243static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc) 244{ 245 struct domain_device *dev = qc->ap->private_data; 246 247 ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf); 248 return true; 249} 250 251static struct sas_internal *dev_to_sas_internal(struct domain_device *dev) 252{ 253 return to_sas_internal(dev->port->ha->core.shost->transportt); 254} 255 256static int sas_get_ata_command_set(struct domain_device *dev); 257 258int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy) 259{ 260 if (phy->attached_tproto & SAS_PROTOCOL_STP) 261 dev->tproto = phy->attached_tproto; 262 if (phy->attached_sata_dev) 263 dev->tproto |= SAS_SATA_DEV; 264 265 if (phy->attached_dev_type == SAS_SATA_PENDING) 266 dev->dev_type = SAS_SATA_PENDING; 267 else { 268 int res; 269 270 dev->dev_type = SAS_SATA_DEV; 271 res = sas_get_report_phy_sata(dev->parent, phy->phy_id, 272 &dev->sata_dev.rps_resp); 273 if (res) { 274 pr_debug("report phy sata to %016llx:%02d returned 0x%x\n", 275 SAS_ADDR(dev->parent->sas_addr), 276 phy->phy_id, res); 277 return res; 278 } 279 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis, 280 sizeof(struct dev_to_host_fis)); 281 dev->sata_dev.class = sas_get_ata_command_set(dev); 282 } 283 return 0; 284} 285 286static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy) 287{ 288 int res; 289 290 /* we weren't pending, so successfully end the reset sequence now */ 291 if (dev->dev_type != SAS_SATA_PENDING) 292 return 1; 293 294 /* hmmm, if this succeeds do we need to repost the domain_device to the 295 * lldd so it can pick up new parameters? 296 */ 297 res = sas_get_ata_info(dev, phy); 298 if (res) 299 return 0; /* retry */ 300 else 301 return 1; 302} 303 304static int smp_ata_check_ready(struct ata_link *link) 305{ 306 int res; 307 struct ata_port *ap = link->ap; 308 struct domain_device *dev = ap->private_data; 309 struct domain_device *ex_dev = dev->parent; 310 struct sas_phy *phy = sas_get_local_phy(dev); 311 struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number]; 312 313 res = sas_ex_phy_discover(ex_dev, phy->number); 314 sas_put_local_phy(phy); 315 316 /* break the wait early if the expander is unreachable, 317 * otherwise keep polling 318 */ 319 if (res == -ECOMM) 320 return res; 321 if (res != SMP_RESP_FUNC_ACC) 322 return 0; 323 324 switch (ex_phy->attached_dev_type) { 325 case SAS_SATA_PENDING: 326 return 0; 327 case SAS_END_DEVICE: 328 if (ex_phy->attached_sata_dev) 329 return sas_ata_clear_pending(dev, ex_phy); 330 fallthrough; 331 default: 332 return -ENODEV; 333 } 334} 335 336static int local_ata_check_ready(struct ata_link *link) 337{ 338 struct ata_port *ap = link->ap; 339 struct domain_device *dev = ap->private_data; 340 struct sas_internal *i = dev_to_sas_internal(dev); 341 342 if (i->dft->lldd_ata_check_ready) 343 return i->dft->lldd_ata_check_ready(dev); 344 else { 345 /* lldd's that don't implement 'ready' checking get the 346 * old default behavior of not coordinating reset 347 * recovery with libata 348 */ 349 return 1; 350 } 351} 352 353static int sas_ata_printk(const char *level, const struct domain_device *ddev, 354 const char *fmt, ...) 355{ 356 struct ata_port *ap = ddev->sata_dev.ap; 357 struct device *dev = &ddev->rphy->dev; 358 struct va_format vaf; 359 va_list args; 360 int r; 361 362 va_start(args, fmt); 363 364 vaf.fmt = fmt; 365 vaf.va = &args; 366 367 r = printk("%s" SAS_FMT "ata%u: %s: %pV", 368 level, ap->print_id, dev_name(dev), &vaf); 369 370 va_end(args); 371 372 return r; 373} 374 375static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class, 376 unsigned long deadline) 377{ 378 int ret = 0, res; 379 struct sas_phy *phy; 380 struct ata_port *ap = link->ap; 381 int (*check_ready)(struct ata_link *link); 382 struct domain_device *dev = ap->private_data; 383 struct sas_internal *i = dev_to_sas_internal(dev); 384 385 res = i->dft->lldd_I_T_nexus_reset(dev); 386 if (res == -ENODEV) 387 return res; 388 389 if (res != TMF_RESP_FUNC_COMPLETE) 390 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n"); 391 392 phy = sas_get_local_phy(dev); 393 if (scsi_is_sas_phy_local(phy)) 394 check_ready = local_ata_check_ready; 395 else 396 check_ready = smp_ata_check_ready; 397 sas_put_local_phy(phy); 398 399 ret = ata_wait_after_reset(link, deadline, check_ready); 400 if (ret && ret != -EAGAIN) 401 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret); 402 403 *class = dev->sata_dev.class; 404 405 ap->cbl = ATA_CBL_SATA; 406 return ret; 407} 408 409/* 410 * notify the lldd to forget the sas_task for this internal ata command 411 * that bypasses scsi-eh 412 */ 413static void sas_ata_internal_abort(struct sas_task *task) 414{ 415 struct sas_internal *si = dev_to_sas_internal(task->dev); 416 unsigned long flags; 417 int res; 418 419 spin_lock_irqsave(&task->task_state_lock, flags); 420 if (task->task_state_flags & SAS_TASK_STATE_ABORTED || 421 task->task_state_flags & SAS_TASK_STATE_DONE) { 422 spin_unlock_irqrestore(&task->task_state_lock, flags); 423 pr_debug("%s: Task %p already finished.\n", __func__, task); 424 goto out; 425 } 426 task->task_state_flags |= SAS_TASK_STATE_ABORTED; 427 spin_unlock_irqrestore(&task->task_state_lock, flags); 428 429 res = si->dft->lldd_abort_task(task); 430 431 spin_lock_irqsave(&task->task_state_lock, flags); 432 if (task->task_state_flags & SAS_TASK_STATE_DONE || 433 res == TMF_RESP_FUNC_COMPLETE) { 434 spin_unlock_irqrestore(&task->task_state_lock, flags); 435 goto out; 436 } 437 438 /* XXX we are not prepared to deal with ->lldd_abort_task() 439 * failures. TODO: lldds need to unconditionally forget about 440 * aborted ata tasks, otherwise we (likely) leak the sas task 441 * here 442 */ 443 pr_warn("%s: Task %p leaked.\n", __func__, task); 444 445 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) 446 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED; 447 spin_unlock_irqrestore(&task->task_state_lock, flags); 448 449 return; 450 out: 451 sas_free_task(task); 452} 453 454static void sas_ata_post_internal(struct ata_queued_cmd *qc) 455{ 456 if (qc->flags & ATA_QCFLAG_FAILED) 457 qc->err_mask |= AC_ERR_OTHER; 458 459 if (qc->err_mask) { 460 /* 461 * Find the sas_task and kill it. By this point, libata 462 * has decided to kill the qc and has frozen the port. 463 * In this state sas_ata_task_done() will no longer free 464 * the sas_task, so we need to notify the lldd (via 465 * ->lldd_abort_task) that the task is dead and free it 466 * ourselves. 467 */ 468 struct sas_task *task = qc->lldd_task; 469 470 qc->lldd_task = NULL; 471 if (!task) 472 return; 473 task->uldd_task = NULL; 474 sas_ata_internal_abort(task); 475 } 476} 477 478 479static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev) 480{ 481 struct domain_device *dev = ap->private_data; 482 struct sas_internal *i = dev_to_sas_internal(dev); 483 484 if (i->dft->lldd_ata_set_dmamode) 485 i->dft->lldd_ata_set_dmamode(dev); 486} 487 488static void sas_ata_sched_eh(struct ata_port *ap) 489{ 490 struct domain_device *dev = ap->private_data; 491 struct sas_ha_struct *ha = dev->port->ha; 492 unsigned long flags; 493 494 spin_lock_irqsave(&ha->lock, flags); 495 if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state)) 496 ha->eh_active++; 497 ata_std_sched_eh(ap); 498 spin_unlock_irqrestore(&ha->lock, flags); 499} 500 501void sas_ata_end_eh(struct ata_port *ap) 502{ 503 struct domain_device *dev = ap->private_data; 504 struct sas_ha_struct *ha = dev->port->ha; 505 unsigned long flags; 506 507 spin_lock_irqsave(&ha->lock, flags); 508 if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state)) 509 ha->eh_active--; 510 spin_unlock_irqrestore(&ha->lock, flags); 511} 512 513static int sas_ata_prereset(struct ata_link *link, unsigned long deadline) 514{ 515 struct ata_port *ap = link->ap; 516 struct domain_device *dev = ap->private_data; 517 struct sas_phy *local_phy = sas_get_local_phy(dev); 518 int res = 0; 519 520 if (!local_phy->enabled || test_bit(SAS_DEV_GONE, &dev->state)) 521 res = -ENOENT; 522 sas_put_local_phy(local_phy); 523 524 return res; 525} 526 527static struct ata_port_operations sas_sata_ops = { 528 .prereset = sas_ata_prereset, 529 .hardreset = sas_ata_hard_reset, 530 .error_handler = ata_std_error_handler, 531 .post_internal_cmd = sas_ata_post_internal, 532 .qc_defer = ata_std_qc_defer, 533 .qc_prep = ata_noop_qc_prep, 534 .qc_issue = sas_ata_qc_issue, 535 .qc_fill_rtf = sas_ata_qc_fill_rtf, 536 .port_start = ata_sas_port_start, 537 .port_stop = ata_sas_port_stop, 538 .set_dmamode = sas_ata_set_dmamode, 539 .sched_eh = sas_ata_sched_eh, 540 .end_eh = sas_ata_end_eh, 541}; 542 543static struct ata_port_info sata_port_info = { 544 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ | 545 ATA_FLAG_SAS_HOST | ATA_FLAG_FPDMA_AUX, 546 .pio_mask = ATA_PIO4, 547 .mwdma_mask = ATA_MWDMA2, 548 .udma_mask = ATA_UDMA6, 549 .port_ops = &sas_sata_ops 550}; 551 552int sas_ata_init(struct domain_device *found_dev) 553{ 554 struct sas_ha_struct *ha = found_dev->port->ha; 555 struct Scsi_Host *shost = ha->core.shost; 556 struct ata_host *ata_host; 557 struct ata_port *ap; 558 int rc; 559 560 ata_host = kzalloc(sizeof(*ata_host), GFP_KERNEL); 561 if (!ata_host) { 562 pr_err("ata host alloc failed.\n"); 563 return -ENOMEM; 564 } 565 566 ata_host_init(ata_host, ha->dev, &sas_sata_ops); 567 568 ap = ata_sas_port_alloc(ata_host, &sata_port_info, shost); 569 if (!ap) { 570 pr_err("ata_sas_port_alloc failed.\n"); 571 rc = -ENODEV; 572 goto free_host; 573 } 574 575 ap->private_data = found_dev; 576 ap->cbl = ATA_CBL_SATA; 577 ap->scsi_host = shost; 578 rc = ata_sas_port_init(ap); 579 if (rc) 580 goto destroy_port; 581 582 rc = ata_sas_tport_add(ata_host->dev, ap); 583 if (rc) 584 goto destroy_port; 585 586 found_dev->sata_dev.ata_host = ata_host; 587 found_dev->sata_dev.ap = ap; 588 589 return 0; 590 591destroy_port: 592 ata_sas_port_destroy(ap); 593free_host: 594 ata_host_put(ata_host); 595 return rc; 596} 597 598void sas_ata_task_abort(struct sas_task *task) 599{ 600 struct ata_queued_cmd *qc = task->uldd_task; 601 struct completion *waiting; 602 603 /* Bounce SCSI-initiated commands to the SCSI EH */ 604 if (qc->scsicmd) { 605 blk_abort_request(qc->scsicmd->request); 606 return; 607 } 608 609 /* Internal command, fake a timeout and complete. */ 610 qc->flags &= ~ATA_QCFLAG_ACTIVE; 611 qc->flags |= ATA_QCFLAG_FAILED; 612 qc->err_mask |= AC_ERR_TIMEOUT; 613 waiting = qc->private_data; 614 complete(waiting); 615} 616 617static int sas_get_ata_command_set(struct domain_device *dev) 618{ 619 struct dev_to_host_fis *fis = 620 (struct dev_to_host_fis *) dev->frame_rcvd; 621 struct ata_taskfile tf; 622 623 if (dev->dev_type == SAS_SATA_PENDING) 624 return ATA_DEV_UNKNOWN; 625 626 ata_tf_from_fis((const u8 *)fis, &tf); 627 628 return ata_dev_classify(&tf); 629} 630 631void sas_probe_sata(struct asd_sas_port *port) 632{ 633 struct domain_device *dev, *n; 634 635 mutex_lock(&port->ha->disco_mutex); 636 list_for_each_entry(dev, &port->disco_list, disco_list_node) { 637 if (!dev_is_sata(dev)) 638 continue; 639 640 ata_sas_async_probe(dev->sata_dev.ap); 641 } 642 mutex_unlock(&port->ha->disco_mutex); 643 644 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) { 645 if (!dev_is_sata(dev)) 646 continue; 647 648 sas_ata_wait_eh(dev); 649 650 /* if libata could not bring the link up, don't surface 651 * the device 652 */ 653 if (!ata_dev_enabled(sas_to_ata_dev(dev))) 654 sas_fail_probe(dev, __func__, -ENODEV); 655 } 656 657} 658 659static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func) 660{ 661 struct domain_device *dev, *n; 662 663 list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) { 664 if (!dev_is_sata(dev)) 665 continue; 666 667 sas_ata_wait_eh(dev); 668 669 /* if libata failed to power manage the device, tear it down */ 670 if (ata_dev_disabled(sas_to_ata_dev(dev))) 671 sas_fail_probe(dev, func, -ENODEV); 672 } 673} 674 675void sas_suspend_sata(struct asd_sas_port *port) 676{ 677 struct domain_device *dev; 678 679 mutex_lock(&port->ha->disco_mutex); 680 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 681 struct sata_device *sata; 682 683 if (!dev_is_sata(dev)) 684 continue; 685 686 sata = &dev->sata_dev; 687 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND) 688 continue; 689 690 ata_sas_port_suspend(sata->ap); 691 } 692 mutex_unlock(&port->ha->disco_mutex); 693 694 sas_ata_flush_pm_eh(port, __func__); 695} 696 697void sas_resume_sata(struct asd_sas_port *port) 698{ 699 struct domain_device *dev; 700 701 mutex_lock(&port->ha->disco_mutex); 702 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 703 struct sata_device *sata; 704 705 if (!dev_is_sata(dev)) 706 continue; 707 708 sata = &dev->sata_dev; 709 if (sata->ap->pm_mesg.event == PM_EVENT_ON) 710 continue; 711 712 ata_sas_port_resume(sata->ap); 713 } 714 mutex_unlock(&port->ha->disco_mutex); 715 716 sas_ata_flush_pm_eh(port, __func__); 717} 718 719/** 720 * sas_discover_sata - discover an STP/SATA domain device 721 * @dev: pointer to struct domain_device of interest 722 * 723 * Devices directly attached to a HA port, have no parents. All other 724 * devices do, and should have their "parent" pointer set appropriately 725 * before calling this function. 726 */ 727int sas_discover_sata(struct domain_device *dev) 728{ 729 if (dev->dev_type == SAS_SATA_PM) 730 return -ENODEV; 731 732 dev->sata_dev.class = sas_get_ata_command_set(dev); 733 sas_fill_in_rphy(dev, dev->rphy); 734 735 return sas_notify_lldd_dev_found(dev); 736} 737 738static void async_sas_ata_eh(void *data, async_cookie_t cookie) 739{ 740 struct domain_device *dev = data; 741 struct ata_port *ap = dev->sata_dev.ap; 742 struct sas_ha_struct *ha = dev->port->ha; 743 744 sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n"); 745 ata_scsi_port_error_handler(ha->core.shost, ap); 746 sas_put_device(dev); 747} 748 749void sas_ata_strategy_handler(struct Scsi_Host *shost) 750{ 751 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 752 ASYNC_DOMAIN_EXCLUSIVE(async); 753 int i; 754 755 /* it's ok to defer revalidation events during ata eh, these 756 * disks are in one of three states: 757 * 1/ present for initial domain discovery, and these 758 * resets will cause bcn flutters 759 * 2/ hot removed, we'll discover that after eh fails 760 * 3/ hot added after initial discovery, lost the race, and need 761 * to catch the next train. 762 */ 763 sas_disable_revalidation(sas_ha); 764 765 spin_lock_irq(&sas_ha->phy_port_lock); 766 for (i = 0; i < sas_ha->num_phys; i++) { 767 struct asd_sas_port *port = sas_ha->sas_port[i]; 768 struct domain_device *dev; 769 770 spin_lock(&port->dev_list_lock); 771 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 772 if (!dev_is_sata(dev)) 773 continue; 774 775 /* hold a reference over eh since we may be 776 * racing with final remove once all commands 777 * are completed 778 */ 779 kref_get(&dev->kref); 780 781 async_schedule_domain(async_sas_ata_eh, dev, &async); 782 } 783 spin_unlock(&port->dev_list_lock); 784 } 785 spin_unlock_irq(&sas_ha->phy_port_lock); 786 787 async_synchronize_full_domain(&async); 788 789 sas_enable_revalidation(sas_ha); 790} 791 792void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q, 793 struct list_head *done_q) 794{ 795 struct scsi_cmnd *cmd, *n; 796 struct domain_device *eh_dev; 797 798 do { 799 LIST_HEAD(sata_q); 800 eh_dev = NULL; 801 802 list_for_each_entry_safe(cmd, n, work_q, eh_entry) { 803 struct domain_device *ddev = cmd_to_domain_dev(cmd); 804 805 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd)) 806 continue; 807 if (eh_dev && eh_dev != ddev) 808 continue; 809 eh_dev = ddev; 810 list_move(&cmd->eh_entry, &sata_q); 811 } 812 813 if (!list_empty(&sata_q)) { 814 struct ata_port *ap = eh_dev->sata_dev.ap; 815 816 sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n"); 817 ata_scsi_cmd_error_handler(shost, ap, &sata_q); 818 /* 819 * ata's error handler may leave the cmd on the list 820 * so make sure they don't remain on a stack list 821 * about to go out of scope. 822 * 823 * This looks strange, since the commands are 824 * now part of no list, but the next error 825 * action will be ata_port_error_handler() 826 * which takes no list and sweeps them up 827 * anyway from the ata tag array. 828 */ 829 while (!list_empty(&sata_q)) 830 list_del_init(sata_q.next); 831 } 832 } while (eh_dev); 833} 834 835void sas_ata_schedule_reset(struct domain_device *dev) 836{ 837 struct ata_eh_info *ehi; 838 struct ata_port *ap; 839 unsigned long flags; 840 841 if (!dev_is_sata(dev)) 842 return; 843 844 ap = dev->sata_dev.ap; 845 ehi = &ap->link.eh_info; 846 847 spin_lock_irqsave(ap->lock, flags); 848 ehi->err_mask |= AC_ERR_TIMEOUT; 849 ehi->action |= ATA_EH_RESET; 850 ata_port_schedule_eh(ap); 851 spin_unlock_irqrestore(ap->lock, flags); 852} 853EXPORT_SYMBOL_GPL(sas_ata_schedule_reset); 854 855void sas_ata_wait_eh(struct domain_device *dev) 856{ 857 struct ata_port *ap; 858 859 if (!dev_is_sata(dev)) 860 return; 861 862 ap = dev->sata_dev.ap; 863 ata_port_wait_eh(ap); 864} 865