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 41 static 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 95 static 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.command_set == ATAPI_COMMAND_SET))) { 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); 172 173 qc_already_gone: 174 list_del_init(&task->list); 175 sas_free_task(task); 176 } 177 178 static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) 179 { 180 unsigned long flags; 181 struct sas_task *task; 182 struct scatterlist *sg; 183 int ret = AC_ERR_SYSTEM; 184 unsigned int si, xfer = 0; 185 struct ata_port *ap = qc->ap; 186 struct domain_device *dev = ap->private_data; 187 struct sas_ha_struct *sas_ha = dev->port->ha; 188 struct Scsi_Host *host = sas_ha->core.shost; 189 struct sas_internal *i = to_sas_internal(host->transportt); 190 191 /* TODO: audit callers to ensure they are ready for qc_issue to 192 * unconditionally re-enable interrupts 193 */ 194 local_irq_save(flags); 195 spin_unlock(ap->lock); 196 197 /* If the device fell off, no sense in issuing commands */ 198 if (test_bit(SAS_DEV_GONE, &dev->state)) 199 goto out; 200 201 task = sas_alloc_task(GFP_ATOMIC); 202 if (!task) 203 goto out; 204 task->dev = dev; 205 task->task_proto = SAS_PROTOCOL_STP; 206 task->task_done = sas_ata_task_done; 207 208 if (qc->tf.command == ATA_CMD_FPDMA_WRITE || 209 qc->tf.command == ATA_CMD_FPDMA_READ) { 210 /* Need to zero out the tag libata assigned us */ 211 qc->tf.nsect = 0; 212 } 213 214 ata_tf_to_fis(&qc->tf, qc->dev->link->pmp, 1, (u8 *)&task->ata_task.fis); 215 task->uldd_task = qc; 216 if (ata_is_atapi(qc->tf.protocol)) { 217 memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len); 218 task->total_xfer_len = qc->nbytes; 219 task->num_scatter = qc->n_elem; 220 } else { 221 for_each_sg(qc->sg, sg, qc->n_elem, si) 222 xfer += sg->length; 223 224 task->total_xfer_len = xfer; 225 task->num_scatter = si; 226 } 227 228 task->data_dir = qc->dma_dir; 229 task->scatter = qc->sg; 230 task->ata_task.retry_count = 1; 231 task->task_state_flags = SAS_TASK_STATE_PENDING; 232 qc->lldd_task = task; 233 234 switch (qc->tf.protocol) { 235 case ATA_PROT_NCQ: 236 task->ata_task.use_ncq = 1; 237 /* fall through */ 238 case ATAPI_PROT_DMA: 239 case ATA_PROT_DMA: 240 task->ata_task.dma_xfer = 1; 241 break; 242 } 243 244 if (qc->scsicmd) 245 ASSIGN_SAS_TASK(qc->scsicmd, task); 246 247 if (sas_ha->lldd_max_execute_num < 2) 248 ret = i->dft->lldd_execute_task(task, 1, GFP_ATOMIC); 249 else 250 ret = sas_queue_up(task); 251 252 /* Examine */ 253 if (ret) { 254 SAS_DPRINTK("lldd_execute_task returned: %d\n", ret); 255 256 if (qc->scsicmd) 257 ASSIGN_SAS_TASK(qc->scsicmd, NULL); 258 sas_free_task(task); 259 ret = AC_ERR_SYSTEM; 260 } 261 262 out: 263 spin_lock(ap->lock); 264 local_irq_restore(flags); 265 return ret; 266 } 267 268 static bool sas_ata_qc_fill_rtf(struct ata_queued_cmd *qc) 269 { 270 struct domain_device *dev = qc->ap->private_data; 271 272 ata_tf_from_fis(dev->sata_dev.fis, &qc->result_tf); 273 return true; 274 } 275 276 static struct sas_internal *dev_to_sas_internal(struct domain_device *dev) 277 { 278 return to_sas_internal(dev->port->ha->core.shost->transportt); 279 } 280 281 static void sas_get_ata_command_set(struct domain_device *dev); 282 283 int sas_get_ata_info(struct domain_device *dev, struct ex_phy *phy) 284 { 285 if (phy->attached_tproto & SAS_PROTOCOL_STP) 286 dev->tproto = phy->attached_tproto; 287 if (phy->attached_sata_dev) 288 dev->tproto |= SAS_SATA_DEV; 289 290 if (phy->attached_dev_type == SAS_SATA_PENDING) 291 dev->dev_type = SAS_SATA_PENDING; 292 else { 293 int res; 294 295 dev->dev_type = SAS_SATA_DEV; 296 res = sas_get_report_phy_sata(dev->parent, phy->phy_id, 297 &dev->sata_dev.rps_resp); 298 if (res) { 299 SAS_DPRINTK("report phy sata to %016llx:0x%x returned " 300 "0x%x\n", SAS_ADDR(dev->parent->sas_addr), 301 phy->phy_id, res); 302 return res; 303 } 304 memcpy(dev->frame_rcvd, &dev->sata_dev.rps_resp.rps.fis, 305 sizeof(struct dev_to_host_fis)); 306 /* TODO switch to ata_dev_classify() */ 307 sas_get_ata_command_set(dev); 308 } 309 return 0; 310 } 311 312 static int sas_ata_clear_pending(struct domain_device *dev, struct ex_phy *phy) 313 { 314 int res; 315 316 /* we weren't pending, so successfully end the reset sequence now */ 317 if (dev->dev_type != SAS_SATA_PENDING) 318 return 1; 319 320 /* hmmm, if this succeeds do we need to repost the domain_device to the 321 * lldd so it can pick up new parameters? 322 */ 323 res = sas_get_ata_info(dev, phy); 324 if (res) 325 return 0; /* retry */ 326 else 327 return 1; 328 } 329 330 static int smp_ata_check_ready(struct ata_link *link) 331 { 332 int res; 333 struct ata_port *ap = link->ap; 334 struct domain_device *dev = ap->private_data; 335 struct domain_device *ex_dev = dev->parent; 336 struct sas_phy *phy = sas_get_local_phy(dev); 337 struct ex_phy *ex_phy = &ex_dev->ex_dev.ex_phy[phy->number]; 338 339 res = sas_ex_phy_discover(ex_dev, phy->number); 340 sas_put_local_phy(phy); 341 342 /* break the wait early if the expander is unreachable, 343 * otherwise keep polling 344 */ 345 if (res == -ECOMM) 346 return res; 347 if (res != SMP_RESP_FUNC_ACC) 348 return 0; 349 350 switch (ex_phy->attached_dev_type) { 351 case SAS_SATA_PENDING: 352 return 0; 353 case SAS_END_DEVICE: 354 if (ex_phy->attached_sata_dev) 355 return sas_ata_clear_pending(dev, ex_phy); 356 default: 357 return -ENODEV; 358 } 359 } 360 361 static int local_ata_check_ready(struct ata_link *link) 362 { 363 struct ata_port *ap = link->ap; 364 struct domain_device *dev = ap->private_data; 365 struct sas_internal *i = dev_to_sas_internal(dev); 366 367 if (i->dft->lldd_ata_check_ready) 368 return i->dft->lldd_ata_check_ready(dev); 369 else { 370 /* lldd's that don't implement 'ready' checking get the 371 * old default behavior of not coordinating reset 372 * recovery with libata 373 */ 374 return 1; 375 } 376 } 377 378 static int sas_ata_printk(const char *level, const struct domain_device *ddev, 379 const char *fmt, ...) 380 { 381 struct ata_port *ap = ddev->sata_dev.ap; 382 struct device *dev = &ddev->rphy->dev; 383 struct va_format vaf; 384 va_list args; 385 int r; 386 387 va_start(args, fmt); 388 389 vaf.fmt = fmt; 390 vaf.va = &args; 391 392 r = printk("%ssas: ata%u: %s: %pV", 393 level, ap->print_id, dev_name(dev), &vaf); 394 395 va_end(args); 396 397 return r; 398 } 399 400 static int sas_ata_hard_reset(struct ata_link *link, unsigned int *class, 401 unsigned long deadline) 402 { 403 int ret = 0, res; 404 struct sas_phy *phy; 405 struct ata_port *ap = link->ap; 406 int (*check_ready)(struct ata_link *link); 407 struct domain_device *dev = ap->private_data; 408 struct sas_internal *i = dev_to_sas_internal(dev); 409 410 res = i->dft->lldd_I_T_nexus_reset(dev); 411 if (res == -ENODEV) 412 return res; 413 414 if (res != TMF_RESP_FUNC_COMPLETE) 415 sas_ata_printk(KERN_DEBUG, dev, "Unable to reset ata device?\n"); 416 417 phy = sas_get_local_phy(dev); 418 if (scsi_is_sas_phy_local(phy)) 419 check_ready = local_ata_check_ready; 420 else 421 check_ready = smp_ata_check_ready; 422 sas_put_local_phy(phy); 423 424 ret = ata_wait_after_reset(link, deadline, check_ready); 425 if (ret && ret != -EAGAIN) 426 sas_ata_printk(KERN_ERR, dev, "reset failed (errno=%d)\n", ret); 427 428 /* XXX: if the class changes during the reset the upper layer 429 * should be informed, if the device has gone away we assume 430 * libsas will eventually delete it 431 */ 432 switch (dev->sata_dev.command_set) { 433 case ATA_COMMAND_SET: 434 *class = ATA_DEV_ATA; 435 break; 436 case ATAPI_COMMAND_SET: 437 *class = ATA_DEV_ATAPI; 438 break; 439 } 440 441 ap->cbl = ATA_CBL_SATA; 442 return ret; 443 } 444 445 /* 446 * notify the lldd to forget the sas_task for this internal ata command 447 * that bypasses scsi-eh 448 */ 449 static void sas_ata_internal_abort(struct sas_task *task) 450 { 451 struct sas_internal *si = dev_to_sas_internal(task->dev); 452 unsigned long flags; 453 int res; 454 455 spin_lock_irqsave(&task->task_state_lock, flags); 456 if (task->task_state_flags & SAS_TASK_STATE_ABORTED || 457 task->task_state_flags & SAS_TASK_STATE_DONE) { 458 spin_unlock_irqrestore(&task->task_state_lock, flags); 459 SAS_DPRINTK("%s: Task %p already finished.\n", __func__, 460 task); 461 goto out; 462 } 463 task->task_state_flags |= SAS_TASK_STATE_ABORTED; 464 spin_unlock_irqrestore(&task->task_state_lock, flags); 465 466 res = si->dft->lldd_abort_task(task); 467 468 spin_lock_irqsave(&task->task_state_lock, flags); 469 if (task->task_state_flags & SAS_TASK_STATE_DONE || 470 res == TMF_RESP_FUNC_COMPLETE) { 471 spin_unlock_irqrestore(&task->task_state_lock, flags); 472 goto out; 473 } 474 475 /* XXX we are not prepared to deal with ->lldd_abort_task() 476 * failures. TODO: lldds need to unconditionally forget about 477 * aborted ata tasks, otherwise we (likely) leak the sas task 478 * here 479 */ 480 SAS_DPRINTK("%s: Task %p leaked.\n", __func__, task); 481 482 if (!(task->task_state_flags & SAS_TASK_STATE_DONE)) 483 task->task_state_flags &= ~SAS_TASK_STATE_ABORTED; 484 spin_unlock_irqrestore(&task->task_state_lock, flags); 485 486 return; 487 out: 488 list_del_init(&task->list); 489 sas_free_task(task); 490 } 491 492 static void sas_ata_post_internal(struct ata_queued_cmd *qc) 493 { 494 if (qc->flags & ATA_QCFLAG_FAILED) 495 qc->err_mask |= AC_ERR_OTHER; 496 497 if (qc->err_mask) { 498 /* 499 * Find the sas_task and kill it. By this point, libata 500 * has decided to kill the qc and has frozen the port. 501 * In this state sas_ata_task_done() will no longer free 502 * the sas_task, so we need to notify the lldd (via 503 * ->lldd_abort_task) that the task is dead and free it 504 * ourselves. 505 */ 506 struct sas_task *task = qc->lldd_task; 507 508 qc->lldd_task = NULL; 509 if (!task) 510 return; 511 task->uldd_task = NULL; 512 sas_ata_internal_abort(task); 513 } 514 } 515 516 517 static void sas_ata_set_dmamode(struct ata_port *ap, struct ata_device *ata_dev) 518 { 519 struct domain_device *dev = ap->private_data; 520 struct sas_internal *i = dev_to_sas_internal(dev); 521 522 if (i->dft->lldd_ata_set_dmamode) 523 i->dft->lldd_ata_set_dmamode(dev); 524 } 525 526 static void sas_ata_sched_eh(struct ata_port *ap) 527 { 528 struct domain_device *dev = ap->private_data; 529 struct sas_ha_struct *ha = dev->port->ha; 530 unsigned long flags; 531 532 spin_lock_irqsave(&ha->lock, flags); 533 if (!test_and_set_bit(SAS_DEV_EH_PENDING, &dev->state)) 534 ha->eh_active++; 535 ata_std_sched_eh(ap); 536 spin_unlock_irqrestore(&ha->lock, flags); 537 } 538 539 void sas_ata_end_eh(struct ata_port *ap) 540 { 541 struct domain_device *dev = ap->private_data; 542 struct sas_ha_struct *ha = dev->port->ha; 543 unsigned long flags; 544 545 spin_lock_irqsave(&ha->lock, flags); 546 if (test_and_clear_bit(SAS_DEV_EH_PENDING, &dev->state)) 547 ha->eh_active--; 548 spin_unlock_irqrestore(&ha->lock, flags); 549 } 550 551 static struct ata_port_operations sas_sata_ops = { 552 .prereset = ata_std_prereset, 553 .hardreset = sas_ata_hard_reset, 554 .postreset = ata_std_postreset, 555 .error_handler = ata_std_error_handler, 556 .post_internal_cmd = sas_ata_post_internal, 557 .qc_defer = ata_std_qc_defer, 558 .qc_prep = ata_noop_qc_prep, 559 .qc_issue = sas_ata_qc_issue, 560 .qc_fill_rtf = sas_ata_qc_fill_rtf, 561 .port_start = ata_sas_port_start, 562 .port_stop = ata_sas_port_stop, 563 .set_dmamode = sas_ata_set_dmamode, 564 .sched_eh = sas_ata_sched_eh, 565 .end_eh = sas_ata_end_eh, 566 }; 567 568 static struct ata_port_info sata_port_info = { 569 .flags = ATA_FLAG_SATA | ATA_FLAG_PIO_DMA | ATA_FLAG_NCQ, 570 .pio_mask = ATA_PIO4, 571 .mwdma_mask = ATA_MWDMA2, 572 .udma_mask = ATA_UDMA6, 573 .port_ops = &sas_sata_ops 574 }; 575 576 int sas_ata_init(struct domain_device *found_dev) 577 { 578 struct sas_ha_struct *ha = found_dev->port->ha; 579 struct Scsi_Host *shost = ha->core.shost; 580 struct ata_port *ap; 581 int rc; 582 583 ata_host_init(&found_dev->sata_dev.ata_host, ha->dev, &sas_sata_ops); 584 ap = ata_sas_port_alloc(&found_dev->sata_dev.ata_host, 585 &sata_port_info, 586 shost); 587 if (!ap) { 588 SAS_DPRINTK("ata_sas_port_alloc failed.\n"); 589 return -ENODEV; 590 } 591 592 ap->private_data = found_dev; 593 ap->cbl = ATA_CBL_SATA; 594 ap->scsi_host = shost; 595 rc = ata_sas_port_init(ap); 596 if (rc) { 597 ata_sas_port_destroy(ap); 598 return rc; 599 } 600 found_dev->sata_dev.ap = ap; 601 602 return 0; 603 } 604 605 void sas_ata_task_abort(struct sas_task *task) 606 { 607 struct ata_queued_cmd *qc = task->uldd_task; 608 struct completion *waiting; 609 610 /* Bounce SCSI-initiated commands to the SCSI EH */ 611 if (qc->scsicmd) { 612 struct request_queue *q = qc->scsicmd->device->request_queue; 613 unsigned long flags; 614 615 spin_lock_irqsave(q->queue_lock, flags); 616 blk_abort_request(qc->scsicmd->request); 617 spin_unlock_irqrestore(q->queue_lock, flags); 618 return; 619 } 620 621 /* Internal command, fake a timeout and complete. */ 622 qc->flags &= ~ATA_QCFLAG_ACTIVE; 623 qc->flags |= ATA_QCFLAG_FAILED; 624 qc->err_mask |= AC_ERR_TIMEOUT; 625 waiting = qc->private_data; 626 complete(waiting); 627 } 628 629 static void sas_get_ata_command_set(struct domain_device *dev) 630 { 631 struct dev_to_host_fis *fis = 632 (struct dev_to_host_fis *) dev->frame_rcvd; 633 634 if (dev->dev_type == SAS_SATA_PENDING) 635 return; 636 637 if ((fis->sector_count == 1 && /* ATA */ 638 fis->lbal == 1 && 639 fis->lbam == 0 && 640 fis->lbah == 0 && 641 fis->device == 0) 642 || 643 (fis->sector_count == 0 && /* CE-ATA (mATA) */ 644 fis->lbal == 0 && 645 fis->lbam == 0xCE && 646 fis->lbah == 0xAA && 647 (fis->device & ~0x10) == 0)) 648 649 dev->sata_dev.command_set = ATA_COMMAND_SET; 650 651 else if ((fis->interrupt_reason == 1 && /* ATAPI */ 652 fis->lbal == 1 && 653 fis->byte_count_low == 0x14 && 654 fis->byte_count_high == 0xEB && 655 (fis->device & ~0x10) == 0)) 656 657 dev->sata_dev.command_set = ATAPI_COMMAND_SET; 658 659 else if ((fis->sector_count == 1 && /* SEMB */ 660 fis->lbal == 1 && 661 fis->lbam == 0x3C && 662 fis->lbah == 0xC3 && 663 fis->device == 0) 664 || 665 (fis->interrupt_reason == 1 && /* SATA PM */ 666 fis->lbal == 1 && 667 fis->byte_count_low == 0x69 && 668 fis->byte_count_high == 0x96 && 669 (fis->device & ~0x10) == 0)) 670 671 /* Treat it as a superset? */ 672 dev->sata_dev.command_set = ATAPI_COMMAND_SET; 673 } 674 675 void sas_probe_sata(struct asd_sas_port *port) 676 { 677 struct domain_device *dev, *n; 678 679 mutex_lock(&port->ha->disco_mutex); 680 list_for_each_entry(dev, &port->disco_list, disco_list_node) { 681 if (!dev_is_sata(dev)) 682 continue; 683 684 ata_sas_async_probe(dev->sata_dev.ap); 685 } 686 mutex_unlock(&port->ha->disco_mutex); 687 688 list_for_each_entry_safe(dev, n, &port->disco_list, disco_list_node) { 689 if (!dev_is_sata(dev)) 690 continue; 691 692 sas_ata_wait_eh(dev); 693 694 /* if libata could not bring the link up, don't surface 695 * the device 696 */ 697 if (ata_dev_disabled(sas_to_ata_dev(dev))) 698 sas_fail_probe(dev, __func__, -ENODEV); 699 } 700 701 } 702 703 static void sas_ata_flush_pm_eh(struct asd_sas_port *port, const char *func) 704 { 705 struct domain_device *dev, *n; 706 707 list_for_each_entry_safe(dev, n, &port->dev_list, dev_list_node) { 708 if (!dev_is_sata(dev)) 709 continue; 710 711 sas_ata_wait_eh(dev); 712 713 /* if libata failed to power manage the device, tear it down */ 714 if (ata_dev_disabled(sas_to_ata_dev(dev))) 715 sas_fail_probe(dev, func, -ENODEV); 716 } 717 } 718 719 void sas_suspend_sata(struct asd_sas_port *port) 720 { 721 struct domain_device *dev; 722 723 mutex_lock(&port->ha->disco_mutex); 724 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 725 struct sata_device *sata; 726 727 if (!dev_is_sata(dev)) 728 continue; 729 730 sata = &dev->sata_dev; 731 if (sata->ap->pm_mesg.event == PM_EVENT_SUSPEND) 732 continue; 733 734 ata_sas_port_suspend(sata->ap); 735 } 736 mutex_unlock(&port->ha->disco_mutex); 737 738 sas_ata_flush_pm_eh(port, __func__); 739 } 740 741 void sas_resume_sata(struct asd_sas_port *port) 742 { 743 struct domain_device *dev; 744 745 mutex_lock(&port->ha->disco_mutex); 746 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 747 struct sata_device *sata; 748 749 if (!dev_is_sata(dev)) 750 continue; 751 752 sata = &dev->sata_dev; 753 if (sata->ap->pm_mesg.event == PM_EVENT_ON) 754 continue; 755 756 ata_sas_port_resume(sata->ap); 757 } 758 mutex_unlock(&port->ha->disco_mutex); 759 760 sas_ata_flush_pm_eh(port, __func__); 761 } 762 763 /** 764 * sas_discover_sata -- discover an STP/SATA domain device 765 * @dev: pointer to struct domain_device of interest 766 * 767 * Devices directly attached to a HA port, have no parents. All other 768 * devices do, and should have their "parent" pointer set appropriately 769 * before calling this function. 770 */ 771 int sas_discover_sata(struct domain_device *dev) 772 { 773 int res; 774 775 if (dev->dev_type == SAS_SATA_PM) 776 return -ENODEV; 777 778 sas_get_ata_command_set(dev); 779 sas_fill_in_rphy(dev, dev->rphy); 780 781 res = sas_notify_lldd_dev_found(dev); 782 if (res) 783 return res; 784 785 sas_discover_event(dev->port, DISCE_PROBE); 786 return 0; 787 } 788 789 static void async_sas_ata_eh(void *data, async_cookie_t cookie) 790 { 791 struct domain_device *dev = data; 792 struct ata_port *ap = dev->sata_dev.ap; 793 struct sas_ha_struct *ha = dev->port->ha; 794 795 sas_ata_printk(KERN_DEBUG, dev, "dev error handler\n"); 796 ata_scsi_port_error_handler(ha->core.shost, ap); 797 sas_put_device(dev); 798 } 799 800 void sas_ata_strategy_handler(struct Scsi_Host *shost) 801 { 802 struct sas_ha_struct *sas_ha = SHOST_TO_SAS_HA(shost); 803 ASYNC_DOMAIN_EXCLUSIVE(async); 804 int i; 805 806 /* it's ok to defer revalidation events during ata eh, these 807 * disks are in one of three states: 808 * 1/ present for initial domain discovery, and these 809 * resets will cause bcn flutters 810 * 2/ hot removed, we'll discover that after eh fails 811 * 3/ hot added after initial discovery, lost the race, and need 812 * to catch the next train. 813 */ 814 sas_disable_revalidation(sas_ha); 815 816 spin_lock_irq(&sas_ha->phy_port_lock); 817 for (i = 0; i < sas_ha->num_phys; i++) { 818 struct asd_sas_port *port = sas_ha->sas_port[i]; 819 struct domain_device *dev; 820 821 spin_lock(&port->dev_list_lock); 822 list_for_each_entry(dev, &port->dev_list, dev_list_node) { 823 if (!dev_is_sata(dev)) 824 continue; 825 826 /* hold a reference over eh since we may be 827 * racing with final remove once all commands 828 * are completed 829 */ 830 kref_get(&dev->kref); 831 832 async_schedule_domain(async_sas_ata_eh, dev, &async); 833 } 834 spin_unlock(&port->dev_list_lock); 835 } 836 spin_unlock_irq(&sas_ha->phy_port_lock); 837 838 async_synchronize_full_domain(&async); 839 840 sas_enable_revalidation(sas_ha); 841 } 842 843 void sas_ata_eh(struct Scsi_Host *shost, struct list_head *work_q, 844 struct list_head *done_q) 845 { 846 struct scsi_cmnd *cmd, *n; 847 struct domain_device *eh_dev; 848 849 do { 850 LIST_HEAD(sata_q); 851 eh_dev = NULL; 852 853 list_for_each_entry_safe(cmd, n, work_q, eh_entry) { 854 struct domain_device *ddev = cmd_to_domain_dev(cmd); 855 856 if (!dev_is_sata(ddev) || TO_SAS_TASK(cmd)) 857 continue; 858 if (eh_dev && eh_dev != ddev) 859 continue; 860 eh_dev = ddev; 861 list_move(&cmd->eh_entry, &sata_q); 862 } 863 864 if (!list_empty(&sata_q)) { 865 struct ata_port *ap = eh_dev->sata_dev.ap; 866 867 sas_ata_printk(KERN_DEBUG, eh_dev, "cmd error handler\n"); 868 ata_scsi_cmd_error_handler(shost, ap, &sata_q); 869 /* 870 * ata's error handler may leave the cmd on the list 871 * so make sure they don't remain on a stack list 872 * about to go out of scope. 873 * 874 * This looks strange, since the commands are 875 * now part of no list, but the next error 876 * action will be ata_port_error_handler() 877 * which takes no list and sweeps them up 878 * anyway from the ata tag array. 879 */ 880 while (!list_empty(&sata_q)) 881 list_del_init(sata_q.next); 882 } 883 } while (eh_dev); 884 } 885 886 void sas_ata_schedule_reset(struct domain_device *dev) 887 { 888 struct ata_eh_info *ehi; 889 struct ata_port *ap; 890 unsigned long flags; 891 892 if (!dev_is_sata(dev)) 893 return; 894 895 ap = dev->sata_dev.ap; 896 ehi = &ap->link.eh_info; 897 898 spin_lock_irqsave(ap->lock, flags); 899 ehi->err_mask |= AC_ERR_TIMEOUT; 900 ehi->action |= ATA_EH_RESET; 901 ata_port_schedule_eh(ap); 902 spin_unlock_irqrestore(ap->lock, flags); 903 } 904 EXPORT_SYMBOL_GPL(sas_ata_schedule_reset); 905 906 void sas_ata_wait_eh(struct domain_device *dev) 907 { 908 struct ata_port *ap; 909 910 if (!dev_is_sata(dev)) 911 return; 912 913 ap = dev->sata_dev.ap; 914 ata_port_wait_eh(ap); 915 } 916