1/* 2 * Support for SATA devices on Serial Attached SCSI (SAS) controllers 3 * 4 * Copyright (C) 2006 IBM Corporation 5 * 6 * Written by: Darrick J. Wong <djwong@us.ibm.com>, IBM Corporation 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License as 10 * published by the Free Software Foundation; either version 2 of the 11 * License, or (at your option) any later version. 12 * 13 * This program is distributed in the hope that it will be useful, but 14 * WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 16 * General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 21 * USA 22 */ 23 24#include <linux/scatterlist.h> 25#include <linux/slab.h> 26#include <linux/async.h> 27#include <linux/export.h> 28 29#include <scsi/sas_ata.h> 30#include "sas_internal.h" 31#include <scsi/scsi_host.h> 32#include <scsi/scsi_device.h> 33#include <scsi/scsi_tcq.h> 34#include <scsi/scsi.h> 35#include <scsi/scsi_transport.h> 36#include <scsi/scsi_transport_sas.h> 37#include "../scsi_sas_internal.h" 38#include "../scsi_transport_api.h" 39#include <scsi/scsi_eh.h> 40 41static enum ata_completion_errors sas_to_ata_err(struct task_status_struct *ts) 42{ 43 /* Cheesy attempt to translate SAS errors into ATA. Hah! */ 44 45 /* transport error */ 46 if (ts->resp == SAS_TASK_UNDELIVERED) 47 return AC_ERR_ATA_BUS; 48 49 /* ts->resp == SAS_TASK_COMPLETE */ 50 /* task delivered, what happened afterwards? */ 51 switch (ts->stat) { 52 case SAS_DEV_NO_RESPONSE: 53 return AC_ERR_TIMEOUT; 54 55 case SAS_INTERRUPTED: 56 case SAS_PHY_DOWN: 57 case SAS_NAK_R_ERR: 58 return AC_ERR_ATA_BUS; 59 60 61 case SAS_DATA_UNDERRUN: 62 /* 63 * Some programs that use the taskfile interface 64 * (smartctl in particular) can cause underrun 65 * problems. Ignore these errors, perhaps at our 66 * peril. 67 */ 68 return 0; 69 70 case SAS_DATA_OVERRUN: 71 case SAS_QUEUE_FULL: 72 case SAS_DEVICE_UNKNOWN: 73 case SAS_SG_ERR: 74 return AC_ERR_INVALID; 75 76 case SAS_OPEN_TO: 77 case SAS_OPEN_REJECT: 78 SAS_DPRINTK("%s: Saw error %d. What to do?\n", 79 __func__, ts->stat); 80 return AC_ERR_OTHER; 81 82 case SAM_STAT_CHECK_CONDITION: 83 case SAS_ABORTED_TASK: 84 return AC_ERR_DEV; 85 86 case SAS_PROTO_RESPONSE: 87 /* This means the ending_fis has the error 88 * value; return 0 here to collect it */ 89 return 0; 90 default: 91 return 0; 92 } 93} 94 95static void sas_ata_task_done(struct sas_task *task) 96{ 97 struct ata_queued_cmd *qc = task->uldd_task; 98 struct domain_device *dev = task->dev; 99 struct task_status_struct *stat = &task->task_status; 100 struct ata_task_resp *resp = (struct ata_task_resp *)stat->buf; 101 struct sas_ha_struct *sas_ha = dev->port->ha; 102 enum ata_completion_errors ac; 103 unsigned long flags; 104 struct ata_link *link; 105 struct ata_port *ap; 106 107 spin_lock_irqsave(&dev->done_lock, flags); 108 if (test_bit(SAS_HA_FROZEN, &sas_ha->state)) 109 task = NULL; 110 else if (qc && qc->scsicmd) 111 ASSIGN_SAS_TASK(qc->scsicmd, NULL); 112 spin_unlock_irqrestore(&dev->done_lock, flags); 113 114 /* check if libsas-eh got to the task before us */ 115 if (unlikely(!task)) 116 return; 117 118 if (!qc) 119 goto qc_already_gone; 120 121 ap = qc->ap; 122 link = &ap->link; 123 124 spin_lock_irqsave(ap->lock, flags); 125 /* check if we lost the race with libata/sas_ata_post_internal() */ 126 if (unlikely(ap->pflags & ATA_PFLAG_FROZEN)) { 127 spin_unlock_irqrestore(ap->lock, flags); 128 if (qc->scsicmd) 129 goto qc_already_gone; 130 else { 131 /* if eh is not involved and the port is frozen then the 132 * ata internal abort process has taken responsibility 133 * for this sas_task 134 */ 135 return; 136 } 137 } 138 139 if (stat->stat == SAS_PROTO_RESPONSE || stat->stat == SAM_STAT_GOOD || 140 ((stat->stat == SAM_STAT_CHECK_CONDITION && 141 dev->sata_dev.class == ATA_DEV_ATAPI))) { 142 memcpy(dev->sata_dev.fis, resp->ending_fis, ATA_RESP_FIS_SIZE); 143 144 if (!link->sactive) { 145 qc->err_mask |= ac_err_mask(dev->sata_dev.fis[2]); 146 } else { 147 link->eh_info.err_mask |= ac_err_mask(dev->sata_dev.fis[2]); 148 if (unlikely(link->eh_info.err_mask)) 149 qc->flags |= ATA_QCFLAG_FAILED; 150 } 151 } else { 152 ac = sas_to_ata_err(stat); 153 if (ac) { 154 SAS_DPRINTK("%s: SAS error %x\n", __func__, 155 stat->stat); 156 /* We saw a SAS error. Send a vague error. */ 157 if (!link->sactive) { 158 qc->err_mask = ac; 159 } else { 160 link->eh_info.err_mask |= AC_ERR_DEV; 161 qc->flags |= ATA_QCFLAG_FAILED; 162 } 163 164 dev->sata_dev.fis[3] = 0x04; /* status err */ 165 dev->sata_dev.fis[2] = ATA_ERR; 166 } 167 } 168 169 qc->lldd_task = NULL; 170 ata_qc_complete(qc); 171 spin_unlock_irqrestore(ap->lock, flags); 172 173qc_already_gone: 174 sas_free_task(task); 175} 176 177static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) 178{ 179 unsigned long flags; 180 struct sas_task *task; 181 struct scatterlist *sg; 182 int ret = AC_ERR_SYSTEM; 183 unsigned int si, xfer = 0; 184 struct ata_port *ap = qc->ap; 185 struct domain_device *dev = ap->private_data; 186 struct sas_ha_struct *sas_ha = dev->port->ha; 187 struct Scsi_Host *host = sas_ha->core.shost; 188 struct sas_internal *i = to_sas_internal(host->transportt); 189 190 /* TODO: audit callers to ensure they are ready for qc_issue to 191 * unconditionally re-enable interrupts 192 */ 193 local_irq_save(flags); 194 spin_unlock(ap->lock); 195 196 /* If the device fell off, no sense in issuing commands */ 197 if (test_bit(SAS_DEV_GONE, &dev->state)) 198 goto out; 199 200 task = sas_alloc_task(GFP_ATOMIC); 201 if (!task) 202 goto out; 203 task->dev = dev; 204 task->task_proto = SAS_PROTOCOL_STP; 205 task->task_done = sas_ata_task_done; 206 207 if (qc->tf.command == ATA_CMD_FPDMA_WRITE || 208 qc->tf.command == ATA_CMD_FPDMA_READ) { 209 /* Need to zero out the tag libata assigned us */ 210 qc->tf.nsect = 0; 211 } 212 213 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis); 214 task->uldd_task = qc; 215 if (ata_is_atapi(qc->tf.protocol)) { 216 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len); 217 task->total_xfer_len = qc->nbytes; 218 task->num_scatter = qc->n_elem; 219 } else { 220 for_each_sg(qc->sg, sg, qc->n_elem, si) 221 xfer += sg->length; 222 223 task->total_xfer_len = xfer; 224 task->num_scatter = si; 225 } 226 227 task->data_dir = qc->dma_dir; 228 task->scatter = qc->sg; 229 task->ata_task.retry_count = 1; 230 task->task_state_flags = SAS_TASK_STATE_PENDING; 231 qc->lldd_task = task; 232 233 switch (qc->tf.protocol) { 234 case ATA_PROT_NCQ: 235 task->ata_task.use_ncq = 1; 236 /* fall through */ 237 case ATAPI_PROT_DMA: 238 case ATA_PROT_DMA: 239 task->ata_task.dma_xfer = 1; 240 break; 241 } 242 243 if (qc->scsicmd) 244 ASSIGN_SAS_TASK(qc->scsicmd, task); 245 246 ret = i->dft->lldd_execute_task(task, GFP_ATOMIC); 247 if (ret) { 248 SAS_DPRINTK("lldd_execute_task returned: %d\n", ret); 249 250 if (qc->scsicmd) 251 ASSIGN_SAS_TASK(qc->scsicmd, NULL); 252 sas_free_task(task); 253 ret = AC_ERR_SYSTEM; 254 } 255 256 out: 257 spin_lock(ap->lock); 258 local_irq_restore(flags); 259 return ret; 260} 261 262static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc) 263{ 264 struct domain_device *dev = qc->ap->private_data; 265 266 ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf); 267 return true; 268} 269 270static struct sas_internal *dev_to_sas_internal(struct domain_device *dev) 271{ 272 return to_sas_internal(dev->port->ha->core.shost->transportt); 273} 274 275static int sas_get_ata_command_set(struct domain_device *dev); 276 277int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy) 278{ 279 if (phy->attached_tproto & SAS_PROTOCOL_STP) 280 dev->tproto = phy->attached_tproto; 281 if (phy->attached_sata_dev) 282 dev->tproto |= SAS_SATA_DEV; 283 284 if (phy->attached_dev_type == SAS_SATA_PENDING) 285 dev->dev_type = SAS_SATA_PENDING; 286 else { 287 int res; 288 289 dev->dev_type = SAS_SATA_DEV; 290 res = sas_get_report_phy_sata(dev->parent, phy->phy_id, 291 &dev->sata_dev.rps_resp); 292 if (res) { 293 SAS_DPRINTK("report phy sata to %016llx:0x%x returned " 294 "0x%x\n", SAS_ADDR(dev->parent->sas_addr), 295 phy->phy_id, res); 296 return res; 297 } 298 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis, 299 sizeof(struct dev_to_host_fis)); 300 dev->sata_dev.class = sas_get_ata_command_set(dev); 301 } 302 return 0; 303} 304 305static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy) 306{ 307 int res; 308 309 /* we weren't pending, so successfully end the reset sequence now */ 310 if (dev->dev_type != SAS_SATA_PENDING) 311 return 1; 312 313 /* hmmm, if this succeeds do we need to repost the domain_device to the 314 * lldd so it can pick up new parameters? 315 */ 316 res = sas_get_ata_info(dev, phy); 317 if (res) 318 return 0; /* retry */ 319 else 320 return 1; 321} 322 323static int smp_ata_check_ready(struct ata_link *link) 324{ 325 int res; 326 struct ata_port *ap = link->ap; 327 struct domain_device *dev = ap->private_data; 328 struct domain_device *ex_dev = dev->parent; 329 struct sas_phy *phy = sas_get_local_phy(dev); 330 struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number]; 331 332 res = sas_ex_phy_discover(ex_dev, phy->number); 333 sas_put_local_phy(phy); 334 335 /* break the wait early if the expander is unreachable, 336 * otherwise keep polling 337 */ 338 if (res == -ECOMM) 339 return res; 340 if (res != SMP_RESP_FUNC_ACC) 341 return 0; 342 343 switch (ex_phy->attached_dev_type) { 344 case SAS_SATA_PENDING: 345 return 0; 346 case SAS_END_DEVICE: 347 if (ex_phy->attached_sata_dev) 348 return sas_ata_clear_pending(dev, ex_phy); 349 default: 350 return -ENODEV; 351 } 352} 353 354static int local_ata_check_ready(struct ata_link *link) 355{ 356 struct ata_port *ap = link->ap; 357 struct domain_device *dev = ap->private_data; 358 struct sas_internal *i = dev_to_sas_internal(dev); 359 360 if (i->dft->lldd_ata_check_ready) 361 return i->dft->lldd_ata_check_ready(dev); 362 else { 363 /* lldd's that don't implement 'ready' checking get the 364 * old default behavior of not coordinating reset 365 * recovery with libata 366 */ 367 return 1; 368 } 369} 370 371static int sas_ata_printk(const char *level, const struct domain_device *ddev, 372 const char *fmt, ...) 373{ 374 struct ata_port *ap = ddev->sata_dev.ap; 375 struct device *dev = &ddev->rphy->dev; 376 struct va_format vaf; 377 va_list args; 378 int r; 379 380 va_start(args, fmt); 381 382 vaf.fmt = fmt; 383 vaf.va = &args; 384 385 r = printk("%ssas: ata%u: %s: %pV", 386 level, ap->print_id, dev_name(dev), &vaf); 387 388 va_end(args); 389 390 return r; 391} 392 393static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class, 394 unsigned long deadline) 395{ 396 int ret = 0, res; 397 struct sas_phy *phy; 398 struct ata_port *ap = link->ap; 399 int (*check_ready)(struct ata_link *link); 400 struct domain_device *dev = ap->private_data; 401 struct sas_internal *i = dev_to_sas_internal(dev); 402 403 res = i->dft->lldd_I_T_nexus_reset(dev); 404 if (res == -ENODEV) 405 return res; 406 407 if (res != TMF_RESP_FUNC_COMPLETE) 408 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n"); 409 410 phy = sas_get_local_phy(dev); 411 if (scsi_is_sas_phy_local(phy)) 412 check_ready = local_ata_check_ready; 413 else 414 check_ready = smp_ata_check_ready; 415 sas_put_local_phy(phy); 416 417 ret = ata_wait_after_reset(link, deadline, check_ready); 418 if (ret && ret != -EAGAIN) 419 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret); 420 421 *class = dev->sata_dev.class; 422 423 ap->cbl = ATA_CBL_SATA; 424 return ret; 425} 426 427/* 428 * notify the lldd to forget the sas_task for this internal ata command 429 * that bypasses scsi-eh 430 */ 431static void sas_ata_internal_abort(struct sas_task *task) 432{ 433 struct sas_internal *si = dev_to_sas_internal(task->dev); 434 unsigned long flags; 435 int res; 436 437 spin_lock_irqsave(&task->task_state_lock, flags); 438 if (task->task_state_flags & SAS_TASK_STATE_ABORTED || 439 task->task_state_flags & SAS_TASK_STATE_DONE) { 440 spin_unlock_irqrestore(&task->task_state_lock, flags); 441 SAS_DPRINTK("%s: Task %p already finished.\n", __func__, 442 task); 443 goto out; 444 } 445 task->task_state_flags |= SAS_TASK_STATE_ABORTED; 446 spin_unlock_irqrestore(&task->task_state_lock, flags); 447 448 res = si->dft->lldd_abort_task(task); 449 450 spin_lock_irqsave(&task->task_state_lock, flags); 451 if (task->task_state_flags & SAS_TASK_STATE_DONE || 452 res == TMF_RESP_FUNC_COMPLETE) { 453 spin_unlock_irqrestore(&task->task_state_lock, flags); 454 goto out; 455 } 456 457 /* XXX we are not prepared to deal with ->lldd_abort_task() 458 * failures. TODO: lldds need to unconditionally forget about 459 * aborted ata tasks, otherwise we (likely) leak the sas task 460 * here 461 */ 462 SAS_DPRINTK("%s: Task %p leaked.\n", __func__, task); 463 464 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) 465 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED; 466 spin_unlock_irqrestore(&task->task_state_lock, flags); 467 468 return; 469 out: 470 sas_free_task(task); 471} 472 473static void sas_ata_post_internal(struct ata_queued_cmd *qc) 474{ 475 if (qc->flags & ATA_QCFLAG_FAILED) 476 qc->err_mask |= AC_ERR_OTHER; 477 478 if (qc->err_mask) { 479 /* 480 * Find the sas_task and kill it. By this point, libata 481 * has decided to kill the qc and has frozen the port. 482 * In this state sas_ata_task_done() will no longer free 483 * the sas_task, so we need to notify the lldd (via 484 * ->lldd_abort_task) that the task is dead and free it 485 * ourselves. 486 */ 487 struct sas_task *task = qc->lldd_task; 488 489 qc->lldd_task = NULL; 490 if (!task) 491 return; 492 task->uldd_task = NULL; 493 sas_ata_internal_abort(task); 494 } 495} 496 497 498static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev) 499{ 500 struct domain_device *dev = ap->private_data; 501 struct sas_internal *i = dev_to_sas_internal(dev); 502 503 if (i->dft->lldd_ata_set_dmamode) 504 i->dft->lldd_ata_set_dmamode(dev); 505} 506 507static void sas_ata_sched_eh(struct ata_port *ap) 508{ 509 struct domain_device *dev = ap->private_data; 510 struct sas_ha_struct *ha = dev->port->ha; 511 unsigned long flags; 512 513 spin_lock_irqsave(&ha->lock, flags); 514 if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state)) 515 ha->eh_active++; 516 ata_std_sched_eh(ap); 517 spin_unlock_irqrestore(&ha->lock, flags); 518} 519 520void sas_ata_end_eh(struct ata_port *ap) 521{ 522 struct domain_device *dev = ap->private_data; 523 struct sas_ha_struct *ha = dev->port->ha; 524 unsigned long flags; 525 526 spin_lock_irqsave(&ha->lock, flags); 527 if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state)) 528 ha->eh_active--; 529 spin_unlock_irqrestore(&ha->lock, flags); 530} 531 532static struct ata_port_operations sas_sata_ops = { 533 .prereset = ata_std_prereset, 534 .hardreset = sas_ata_hard_reset, 535 .postreset = ata_std_postreset, 536 .error_handler = ata_std_error_handler, 537 .post_internal_cmd = sas_ata_post_internal, 538 .qc_defer = ata_std_qc_defer, 539 .qc_prep = ata_noop_qc_prep, 540 .qc_issue = sas_ata_qc_issue, 541 .qc_fill_rtf = sas_ata_qc_fill_rtf, 542 .port_start = ata_sas_port_start, 543 .port_stop = ata_sas_port_stop, 544 .set_dmamode = sas_ata_set_dmamode, 545 .sched_eh = sas_ata_sched_eh, 546 .end_eh = sas_ata_end_eh, 547}; 548 549static struct ata_port_info sata_port_info = { 550 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ | 551 ATA_FLAG_SAS_HOST, 552 .pio_mask = ATA_PIO4, 553 .mwdma_mask = ATA_MWDMA2, 554 .udma_mask = ATA_UDMA6, 555 .port_ops = &sas_sata_ops 556}; 557 558int sas_ata_init(struct domain_device *found_dev) 559{ 560 struct sas_ha_struct *ha = found_dev->port->ha; 561 struct Scsi_Host *shost = ha->core.shost; 562 struct ata_port *ap; 563 int rc; 564 565 ata_host_init(&found_dev->sata_dev.ata_host, ha->dev, &sas_sata_ops); 566 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host, 567 &sata_port_info, 568 shost); 569 if (!ap) { 570 SAS_DPRINTK("ata_sas_port_alloc failed.\n"); 571 return -ENODEV; 572 } 573 574 ap->private_data = found_dev; 575 ap->cbl = ATA_CBL_SATA; 576 ap->scsi_host = shost; 577 rc = ata_sas_port_init(ap); 578 if (rc) { 579 ata_sas_port_destroy(ap); 580 return rc; 581 } 582 found_dev->sata_dev.ap = ap; 583 584 return 0; 585} 586 587void sas_ata_task_abort(struct sas_task *task) 588{ 589 struct ata_queued_cmd *qc = task->uldd_task; 590 struct completion *waiting; 591 592 /* Bounce SCSI-initiated commands to the SCSI EH */ 593 if (qc->scsicmd) { 594 struct request_queue *q = qc->scsicmd->device->request_queue; 595 unsigned long flags; 596 597 spin_lock_irqsave(q->queue_lock, flags); 598 blk_abort_request(qc->scsicmd->request); 599 spin_unlock_irqrestore(q->queue_lock, flags); 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 611static 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 625void 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_disabled(sas_to_ata_dev(dev))) 648 sas_fail_probe(dev, __func__, -ENODEV); 649 } 650 651} 652 653static 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 669void 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 691void 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 */ 721int sas_discover_sata(struct domain_device *dev) 722{ 723 int res; 724 725 if (dev->dev_type == SAS_SATA_PM) 726 return -ENODEV; 727 728 dev->sata_dev.class = sas_get_ata_command_set(dev); 729 sas_fill_in_rphy(dev, dev->rphy); 730 731 res = sas_notify_lldd_dev_found(dev); 732 if (res) 733 return res; 734 735 sas_discover_event(dev->port, DISCE_PROBE); 736 return 0; 737} 738 739static void async_sas_ata_eh(void *data, async_cookie_t cookie) 740{ 741 struct domain_device *dev = data; 742 struct ata_port *ap = dev->sata_dev.ap; 743 struct sas_ha_struct *ha = dev->port->ha; 744 745 sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n"); 746 ata_scsi_port_error_handler(ha->core.shost, ap); 747 sas_put_device(dev); 748} 749 750void sas_ata_strategy_handler(struct Scsi_Host *shost) 751{ 752 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 753 ASYNC_DOMAIN_EXCLUSIVE(async); 754 int i; 755 756 /* it's ok to defer revalidation events during ata eh, these 757 * disks are in one of three states: 758 * 1/ present for initial domain discovery, and these 759 * resets will cause bcn flutters 760 * 2/ hot removed, we'll discover that after eh fails 761 * 3/ hot added after initial discovery, lost the race, and need 762 * to catch the next train. 763 */ 764 sas_disable_revalidation(sas_ha); 765 766 spin_lock_irq(&sas_ha->phy_port_lock); 767 for (i = 0; i < sas_ha->num_phys; i++) { 768 struct asd_sas_port *port = sas_ha->sas_port[i]; 769 struct domain_device *dev; 770 771 spin_lock(&port->dev_list_lock); 772 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 773 if (!dev_is_sata(dev)) 774 continue; 775 776 /* hold a reference over eh since we may be 777 * racing with final remove once all commands 778 * are completed 779 */ 780 kref_get(&dev->kref); 781 782 async_schedule_domain(async_sas_ata_eh, dev, &async); 783 } 784 spin_unlock(&port->dev_list_lock); 785 } 786 spin_unlock_irq(&sas_ha->phy_port_lock); 787 788 async_synchronize_full_domain(&async); 789 790 sas_enable_revalidation(sas_ha); 791} 792 793void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q, 794 struct list_head *done_q) 795{ 796 struct scsi_cmnd *cmd, *n; 797 struct domain_device *eh_dev; 798 799 do { 800 LIST_HEAD(sata_q); 801 eh_dev = NULL; 802 803 list_for_each_entry_safe(cmd, n, work_q, eh_entry) { 804 struct domain_device *ddev = cmd_to_domain_dev(cmd); 805 806 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd)) 807 continue; 808 if (eh_dev && eh_dev != ddev) 809 continue; 810 eh_dev = ddev; 811 list_move(&cmd->eh_entry, &sata_q); 812 } 813 814 if (!list_empty(&sata_q)) { 815 struct ata_port *ap = eh_dev->sata_dev.ap; 816 817 sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n"); 818 ata_scsi_cmd_error_handler(shost, ap, &sata_q); 819 /* 820 * ata's error handler may leave the cmd on the list 821 * so make sure they don't remain on a stack list 822 * about to go out of scope. 823 * 824 * This looks strange, since the commands are 825 * now part of no list, but the next error 826 * action will be ata_port_error_handler() 827 * which takes no list and sweeps them up 828 * anyway from the ata tag array. 829 */ 830 while (!list_empty(&sata_q)) 831 list_del_init(sata_q.next); 832 } 833 } while (eh_dev); 834} 835 836void sas_ata_schedule_reset(struct domain_device *dev) 837{ 838 struct ata_eh_info *ehi; 839 struct ata_port *ap; 840 unsigned long flags; 841 842 if (!dev_is_sata(dev)) 843 return; 844 845 ap = dev->sata_dev.ap; 846 ehi = &ap->link.eh_info; 847 848 spin_lock_irqsave(ap->lock, flags); 849 ehi->err_mask |= AC_ERR_TIMEOUT; 850 ehi->action |= ATA_EH_RESET; 851 ata_port_schedule_eh(ap); 852 spin_unlock_irqrestore(ap->lock, flags); 853} 854EXPORT_SYMBOL_GPL(sas_ata_schedule_reset); 855 856void sas_ata_wait_eh(struct domain_device *dev) 857{ 858 struct ata_port *ap; 859 860 if (!dev_is_sata(dev)) 861 return; 862 863 ap = dev->sata_dev.ap; 864 ata_port_wait_eh(ap); 865} 866