1/* 2 * This file is provided under a dual BSD/GPLv2 license. When using or 3 * redistributing this file, you may do so under either license. 4 * 5 * GPL LICENSE SUMMARY 6 * 7 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of version 2 of the GNU General Public License as 11 * published by the Free Software Foundation. 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., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 21 * The full GNU General Public License is included in this distribution 22 * in the file called LICENSE.GPL. 23 * 24 * BSD LICENSE 25 * 26 * Copyright(c) 2008 - 2011 Intel Corporation. All rights reserved. 27 * All rights reserved. 28 * 29 * Redistribution and use in source and binary forms, with or without 30 * modification, are permitted provided that the following conditions 31 * are met: 32 * 33 * * Redistributions of source code must retain the above copyright 34 * notice, this list of conditions and the following disclaimer. 35 * * Redistributions in binary form must reproduce the above copyright 36 * notice, this list of conditions and the following disclaimer in 37 * the documentation and/or other materials provided with the 38 * distribution. 39 * * Neither the name of Intel Corporation nor the names of its 40 * contributors may be used to endorse or promote products derived 41 * from this software without specific prior written permission. 42 * 43 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 44 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 45 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 46 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 47 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 48 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 49 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 50 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 51 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 52 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 53 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 54 */ 55 56#include <linux/completion.h> 57#include <linux/irqflags.h> 58#include "sas.h" 59#include <scsi/libsas.h> 60#include "remote_device.h" 61#include "remote_node_context.h" 62#include "isci.h" 63#include "request.h" 64#include "task.h" 65#include "host.h" 66 67/** 68* isci_task_refuse() - complete the request to the upper layer driver in 69* the case where an I/O needs to be completed back in the submit path. 70* @ihost: host on which the the request was queued 71* @task: request to complete 72* @response: response code for the completed task. 73* @status: status code for the completed task. 74* 75*/ 76static void isci_task_refuse(struct isci_host *ihost, struct sas_task *task, 77 enum service_response response, 78 enum exec_status status) 79 80{ 81 enum isci_completion_selection disposition; 82 83 disposition = isci_perform_normal_io_completion; 84 disposition = isci_task_set_completion_status(task, response, status, 85 disposition); 86 87 /* Tasks aborted specifically by a call to the lldd_abort_task 88 * function should not be completed to the host in the regular path. 89 */ 90 switch (disposition) { 91 case isci_perform_normal_io_completion: 92 /* Normal notification (task_done) */ 93 dev_dbg(&ihost->pdev->dev, 94 "%s: Normal - task = %p, response=%d, " 95 "status=%d\n", 96 __func__, task, response, status); 97 98 task->lldd_task = NULL; 99 100 isci_execpath_callback(ihost, task, task->task_done); 101 break; 102 103 case isci_perform_aborted_io_completion: 104 /* 105 * No notification because this request is already in the 106 * abort path. 107 */ 108 dev_dbg(&ihost->pdev->dev, 109 "%s: Aborted - task = %p, response=%d, " 110 "status=%d\n", 111 __func__, task, response, status); 112 break; 113 114 case isci_perform_error_io_completion: 115 /* Use sas_task_abort */ 116 dev_dbg(&ihost->pdev->dev, 117 "%s: Error - task = %p, response=%d, " 118 "status=%d\n", 119 __func__, task, response, status); 120 121 isci_execpath_callback(ihost, task, sas_task_abort); 122 break; 123 124 default: 125 dev_dbg(&ihost->pdev->dev, 126 "%s: isci task notification default case!", 127 __func__); 128 sas_task_abort(task); 129 break; 130 } 131} 132 133#define for_each_sas_task(num, task) \ 134 for (; num > 0; num--,\ 135 task = list_entry(task->list.next, struct sas_task, list)) 136 137 138static inline int isci_device_io_ready(struct isci_remote_device *idev, 139 struct sas_task *task) 140{ 141 return idev ? test_bit(IDEV_IO_READY, &idev->flags) || 142 (test_bit(IDEV_IO_NCQERROR, &idev->flags) && 143 isci_task_is_ncq_recovery(task)) 144 : 0; 145} 146/** 147 * isci_task_execute_task() - This function is one of the SAS Domain Template 148 * functions. This function is called by libsas to send a task down to 149 * hardware. 150 * @task: This parameter specifies the SAS task to send. 151 * @num: This parameter specifies the number of tasks to queue. 152 * @gfp_flags: This parameter specifies the context of this call. 153 * 154 * status, zero indicates success. 155 */ 156int isci_task_execute_task(struct sas_task *task, int num, gfp_t gfp_flags) 157{ 158 struct isci_host *ihost = dev_to_ihost(task->dev); 159 struct isci_remote_device *idev; 160 unsigned long flags; 161 bool io_ready; 162 u16 tag; 163 164 dev_dbg(&ihost->pdev->dev, "%s: num=%d\n", __func__, num); 165 166 for_each_sas_task(num, task) { 167 enum sci_status status = SCI_FAILURE; 168 169 spin_lock_irqsave(&ihost->scic_lock, flags); 170 idev = isci_lookup_device(task->dev); 171 io_ready = isci_device_io_ready(idev, task); 172 tag = isci_alloc_tag(ihost); 173 spin_unlock_irqrestore(&ihost->scic_lock, flags); 174 175 dev_dbg(&ihost->pdev->dev, 176 "task: %p, num: %d dev: %p idev: %p:%#lx cmd = %p\n", 177 task, num, task->dev, idev, idev ? idev->flags : 0, 178 task->uldd_task); 179 180 if (!idev) { 181 isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED, 182 SAS_DEVICE_UNKNOWN); 183 } else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) { 184 /* Indicate QUEUE_FULL so that the scsi midlayer 185 * retries. 186 */ 187 isci_task_refuse(ihost, task, SAS_TASK_COMPLETE, 188 SAS_QUEUE_FULL); 189 } else { 190 /* There is a device and it's ready for I/O. */ 191 spin_lock_irqsave(&task->task_state_lock, flags); 192 193 if (task->task_state_flags & SAS_TASK_STATE_ABORTED) { 194 /* The I/O was aborted. */ 195 spin_unlock_irqrestore(&task->task_state_lock, 196 flags); 197 198 isci_task_refuse(ihost, task, 199 SAS_TASK_UNDELIVERED, 200 SAM_STAT_TASK_ABORTED); 201 } else { 202 task->task_state_flags |= SAS_TASK_AT_INITIATOR; 203 spin_unlock_irqrestore(&task->task_state_lock, flags); 204 205 /* build and send the request. */ 206 status = isci_request_execute(ihost, idev, task, tag); 207 208 if (status != SCI_SUCCESS) { 209 210 spin_lock_irqsave(&task->task_state_lock, flags); 211 /* Did not really start this command. */ 212 task->task_state_flags &= ~SAS_TASK_AT_INITIATOR; 213 spin_unlock_irqrestore(&task->task_state_lock, flags); 214 215 if (test_bit(IDEV_GONE, &idev->flags)) { 216 217 /* Indicate that the device 218 * is gone. 219 */ 220 isci_task_refuse(ihost, task, 221 SAS_TASK_UNDELIVERED, 222 SAS_DEVICE_UNKNOWN); 223 } else { 224 /* Indicate QUEUE_FULL so that 225 * the scsi midlayer retries. 226 * If the request failed for 227 * remote device reasons, it 228 * gets returned as 229 * SAS_TASK_UNDELIVERED next 230 * time through. 231 */ 232 isci_task_refuse(ihost, task, 233 SAS_TASK_COMPLETE, 234 SAS_QUEUE_FULL); 235 } 236 } 237 } 238 } 239 if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) { 240 spin_lock_irqsave(&ihost->scic_lock, flags); 241 /* command never hit the device, so just free 242 * the tci and skip the sequence increment 243 */ 244 isci_tci_free(ihost, ISCI_TAG_TCI(tag)); 245 spin_unlock_irqrestore(&ihost->scic_lock, flags); 246 } 247 isci_put_device(idev); 248 } 249 return 0; 250} 251 252static enum sci_status isci_sata_management_task_request_build(struct isci_request *ireq) 253{ 254 struct isci_tmf *isci_tmf; 255 enum sci_status status; 256 257 if (!test_bit(IREQ_TMF, &ireq->flags)) 258 return SCI_FAILURE; 259 260 isci_tmf = isci_request_access_tmf(ireq); 261 262 switch (isci_tmf->tmf_code) { 263 264 case isci_tmf_sata_srst_high: 265 case isci_tmf_sata_srst_low: { 266 struct host_to_dev_fis *fis = &ireq->stp.cmd; 267 268 memset(fis, 0, sizeof(*fis)); 269 270 fis->fis_type = 0x27; 271 fis->flags &= ~0x80; 272 fis->flags &= 0xF0; 273 if (isci_tmf->tmf_code == isci_tmf_sata_srst_high) 274 fis->control |= ATA_SRST; 275 else 276 fis->control &= ~ATA_SRST; 277 break; 278 } 279 /* other management commnd go here... */ 280 default: 281 return SCI_FAILURE; 282 } 283 284 /* core builds the protocol specific request 285 * based on the h2d fis. 286 */ 287 status = sci_task_request_construct_sata(ireq); 288 289 return status; 290} 291 292static struct isci_request *isci_task_request_build(struct isci_host *ihost, 293 struct isci_remote_device *idev, 294 u16 tag, struct isci_tmf *isci_tmf) 295{ 296 enum sci_status status = SCI_FAILURE; 297 struct isci_request *ireq = NULL; 298 struct domain_device *dev; 299 300 dev_dbg(&ihost->pdev->dev, 301 "%s: isci_tmf = %p\n", __func__, isci_tmf); 302 303 dev = idev->domain_dev; 304 305 /* do common allocation and init of request object. */ 306 ireq = isci_tmf_request_from_tag(ihost, isci_tmf, tag); 307 if (!ireq) 308 return NULL; 309 310 /* let the core do it's construct. */ 311 status = sci_task_request_construct(ihost, idev, tag, 312 ireq); 313 314 if (status != SCI_SUCCESS) { 315 dev_warn(&ihost->pdev->dev, 316 "%s: sci_task_request_construct failed - " 317 "status = 0x%x\n", 318 __func__, 319 status); 320 return NULL; 321 } 322 323 /* XXX convert to get this from task->tproto like other drivers */ 324 if (dev->dev_type == SAS_END_DEV) { 325 isci_tmf->proto = SAS_PROTOCOL_SSP; 326 status = sci_task_request_construct_ssp(ireq); 327 if (status != SCI_SUCCESS) 328 return NULL; 329 } 330 331 if (dev->dev_type == SATA_DEV || (dev->tproto & SAS_PROTOCOL_STP)) { 332 isci_tmf->proto = SAS_PROTOCOL_SATA; 333 status = isci_sata_management_task_request_build(ireq); 334 335 if (status != SCI_SUCCESS) 336 return NULL; 337 } 338 return ireq; 339} 340 341/** 342* isci_request_mark_zombie() - This function must be called with scic_lock held. 343*/ 344static void isci_request_mark_zombie(struct isci_host *ihost, struct isci_request *ireq) 345{ 346 struct completion *tmf_completion = NULL; 347 struct completion *req_completion; 348 349 /* Set the request state to "dead". */ 350 ireq->status = dead; 351 352 req_completion = ireq->io_request_completion; 353 ireq->io_request_completion = NULL; 354 355 if (test_bit(IREQ_TMF, &ireq->flags)) { 356 /* Break links with the TMF request. */ 357 struct isci_tmf *tmf = isci_request_access_tmf(ireq); 358 359 /* In the case where a task request is dying, 360 * the thread waiting on the complete will sit and 361 * timeout unless we wake it now. Since the TMF 362 * has a default error status, complete it here 363 * to wake the waiting thread. 364 */ 365 if (tmf) { 366 tmf_completion = tmf->complete; 367 tmf->complete = NULL; 368 } 369 ireq->ttype_ptr.tmf_task_ptr = NULL; 370 dev_dbg(&ihost->pdev->dev, "%s: tmf_code %d, managed tag %#x\n", 371 __func__, tmf->tmf_code, tmf->io_tag); 372 } else { 373 /* Break links with the sas_task - the callback is done 374 * elsewhere. 375 */ 376 struct sas_task *task = isci_request_access_task(ireq); 377 378 if (task) 379 task->lldd_task = NULL; 380 381 ireq->ttype_ptr.io_task_ptr = NULL; 382 } 383 384 dev_warn(&ihost->pdev->dev, "task context unrecoverable (tag: %#x)\n", 385 ireq->io_tag); 386 387 /* Don't force waiting threads to timeout. */ 388 if (req_completion) 389 complete(req_completion); 390 391 if (tmf_completion != NULL) 392 complete(tmf_completion); 393} 394 395static int isci_task_execute_tmf(struct isci_host *ihost, 396 struct isci_remote_device *idev, 397 struct isci_tmf *tmf, unsigned long timeout_ms) 398{ 399 DECLARE_COMPLETION_ONSTACK(completion); 400 enum sci_task_status status = SCI_TASK_FAILURE; 401 struct isci_request *ireq; 402 int ret = TMF_RESP_FUNC_FAILED; 403 unsigned long flags; 404 unsigned long timeleft; 405 u16 tag; 406 407 spin_lock_irqsave(&ihost->scic_lock, flags); 408 tag = isci_alloc_tag(ihost); 409 spin_unlock_irqrestore(&ihost->scic_lock, flags); 410 411 if (tag == SCI_CONTROLLER_INVALID_IO_TAG) 412 return ret; 413 414 /* sanity check, return TMF_RESP_FUNC_FAILED 415 * if the device is not there and ready. 416 */ 417 if (!idev || 418 (!test_bit(IDEV_IO_READY, &idev->flags) && 419 !test_bit(IDEV_IO_NCQERROR, &idev->flags))) { 420 dev_dbg(&ihost->pdev->dev, 421 "%s: idev = %p not ready (%#lx)\n", 422 __func__, 423 idev, idev ? idev->flags : 0); 424 goto err_tci; 425 } else 426 dev_dbg(&ihost->pdev->dev, 427 "%s: idev = %p\n", 428 __func__, idev); 429 430 /* Assign the pointer to the TMF's completion kernel wait structure. */ 431 tmf->complete = &completion; 432 tmf->status = SCI_FAILURE_TIMEOUT; 433 434 ireq = isci_task_request_build(ihost, idev, tag, tmf); 435 if (!ireq) 436 goto err_tci; 437 438 spin_lock_irqsave(&ihost->scic_lock, flags); 439 440 /* start the TMF io. */ 441 status = sci_controller_start_task(ihost, idev, ireq); 442 443 if (status != SCI_TASK_SUCCESS) { 444 dev_dbg(&ihost->pdev->dev, 445 "%s: start_io failed - status = 0x%x, request = %p\n", 446 __func__, 447 status, 448 ireq); 449 spin_unlock_irqrestore(&ihost->scic_lock, flags); 450 goto err_tci; 451 } 452 453 if (tmf->cb_state_func != NULL) 454 tmf->cb_state_func(isci_tmf_started, tmf, tmf->cb_data); 455 456 isci_request_change_state(ireq, started); 457 458 /* add the request to the remote device request list. */ 459 list_add(&ireq->dev_node, &idev->reqs_in_process); 460 461 spin_unlock_irqrestore(&ihost->scic_lock, flags); 462 463 /* Wait for the TMF to complete, or a timeout. */ 464 timeleft = wait_for_completion_timeout(&completion, 465 msecs_to_jiffies(timeout_ms)); 466 467 if (timeleft == 0) { 468 /* The TMF did not complete - this could be because 469 * of an unplug. Terminate the TMF request now. 470 */ 471 spin_lock_irqsave(&ihost->scic_lock, flags); 472 473 if (tmf->cb_state_func != NULL) 474 tmf->cb_state_func(isci_tmf_timed_out, tmf, 475 tmf->cb_data); 476 477 sci_controller_terminate_request(ihost, idev, ireq); 478 479 spin_unlock_irqrestore(&ihost->scic_lock, flags); 480 481 timeleft = wait_for_completion_timeout( 482 &completion, 483 msecs_to_jiffies(ISCI_TERMINATION_TIMEOUT_MSEC)); 484 485 if (!timeleft) { 486 /* Strange condition - the termination of the TMF 487 * request timed-out. 488 */ 489 spin_lock_irqsave(&ihost->scic_lock, flags); 490 491 /* If the TMF status has not changed, kill it. */ 492 if (tmf->status == SCI_FAILURE_TIMEOUT) 493 isci_request_mark_zombie(ihost, ireq); 494 495 spin_unlock_irqrestore(&ihost->scic_lock, flags); 496 } 497 } 498 499 isci_print_tmf(ihost, tmf); 500 501 if (tmf->status == SCI_SUCCESS) 502 ret = TMF_RESP_FUNC_COMPLETE; 503 else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) { 504 dev_dbg(&ihost->pdev->dev, 505 "%s: tmf.status == " 506 "SCI_FAILURE_IO_RESPONSE_VALID\n", 507 __func__); 508 ret = TMF_RESP_FUNC_COMPLETE; 509 } 510 /* Else - leave the default "failed" status alone. */ 511 512 dev_dbg(&ihost->pdev->dev, 513 "%s: completed request = %p\n", 514 __func__, 515 ireq); 516 517 return ret; 518 519 err_tci: 520 spin_lock_irqsave(&ihost->scic_lock, flags); 521 isci_tci_free(ihost, ISCI_TAG_TCI(tag)); 522 spin_unlock_irqrestore(&ihost->scic_lock, flags); 523 524 return ret; 525} 526 527static void isci_task_build_tmf(struct isci_tmf *tmf, 528 enum isci_tmf_function_codes code, 529 void (*tmf_sent_cb)(enum isci_tmf_cb_state, 530 struct isci_tmf *, 531 void *), 532 void *cb_data) 533{ 534 memset(tmf, 0, sizeof(*tmf)); 535 536 tmf->tmf_code = code; 537 tmf->cb_state_func = tmf_sent_cb; 538 tmf->cb_data = cb_data; 539} 540 541static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf, 542 enum isci_tmf_function_codes code, 543 void (*tmf_sent_cb)(enum isci_tmf_cb_state, 544 struct isci_tmf *, 545 void *), 546 struct isci_request *old_request) 547{ 548 isci_task_build_tmf(tmf, code, tmf_sent_cb, old_request); 549 tmf->io_tag = old_request->io_tag; 550} 551 552/** 553 * isci_task_validate_request_to_abort() - This function checks the given I/O 554 * against the "started" state. If the request is still "started", it's 555 * state is changed to aborted. NOTE: isci_host->scic_lock MUST BE HELD 556 * BEFORE CALLING THIS FUNCTION. 557 * @isci_request: This parameter specifies the request object to control. 558 * @isci_host: This parameter specifies the ISCI host object 559 * @isci_device: This is the device to which the request is pending. 560 * @aborted_io_completion: This is a completion structure that will be added to 561 * the request in case it is changed to aborting; this completion is 562 * triggered when the request is fully completed. 563 * 564 * Either "started" on successful change of the task status to "aborted", or 565 * "unallocated" if the task cannot be controlled. 566 */ 567static enum isci_request_status isci_task_validate_request_to_abort( 568 struct isci_request *isci_request, 569 struct isci_host *isci_host, 570 struct isci_remote_device *isci_device, 571 struct completion *aborted_io_completion) 572{ 573 enum isci_request_status old_state = unallocated; 574 575 /* Only abort the task if it's in the 576 * device's request_in_process list 577 */ 578 if (isci_request && !list_empty(&isci_request->dev_node)) { 579 old_state = isci_request_change_started_to_aborted( 580 isci_request, aborted_io_completion); 581 582 } 583 584 return old_state; 585} 586 587static int isci_request_is_dealloc_managed(enum isci_request_status stat) 588{ 589 switch (stat) { 590 case aborted: 591 case aborting: 592 case terminating: 593 case completed: 594 case dead: 595 return true; 596 default: 597 return false; 598 } 599} 600 601/** 602 * isci_terminate_request_core() - This function will terminate the given 603 * request, and wait for it to complete. This function must only be called 604 * from a thread that can wait. Note that the request is terminated and 605 * completed (back to the host, if started there). 606 * @ihost: This SCU. 607 * @idev: The target. 608 * @isci_request: The I/O request to be terminated. 609 * 610 */ 611static void isci_terminate_request_core(struct isci_host *ihost, 612 struct isci_remote_device *idev, 613 struct isci_request *isci_request) 614{ 615 enum sci_status status = SCI_SUCCESS; 616 bool was_terminated = false; 617 bool needs_cleanup_handling = false; 618 unsigned long flags; 619 unsigned long termination_completed = 1; 620 struct completion *io_request_completion; 621 622 dev_dbg(&ihost->pdev->dev, 623 "%s: device = %p; request = %p\n", 624 __func__, idev, isci_request); 625 626 spin_lock_irqsave(&ihost->scic_lock, flags); 627 628 io_request_completion = isci_request->io_request_completion; 629 630 /* Note that we are not going to control 631 * the target to abort the request. 632 */ 633 set_bit(IREQ_COMPLETE_IN_TARGET, &isci_request->flags); 634 635 /* Make sure the request wasn't just sitting around signalling 636 * device condition (if the request handle is NULL, then the 637 * request completed but needed additional handling here). 638 */ 639 if (!test_bit(IREQ_TERMINATED, &isci_request->flags)) { 640 was_terminated = true; 641 needs_cleanup_handling = true; 642 status = sci_controller_terminate_request(ihost, 643 idev, 644 isci_request); 645 } 646 spin_unlock_irqrestore(&ihost->scic_lock, flags); 647 648 /* 649 * The only time the request to terminate will 650 * fail is when the io request is completed and 651 * being aborted. 652 */ 653 if (status != SCI_SUCCESS) { 654 dev_dbg(&ihost->pdev->dev, 655 "%s: sci_controller_terminate_request" 656 " returned = 0x%x\n", 657 __func__, status); 658 659 isci_request->io_request_completion = NULL; 660 661 } else { 662 if (was_terminated) { 663 dev_dbg(&ihost->pdev->dev, 664 "%s: before completion wait (%p/%p)\n", 665 __func__, isci_request, io_request_completion); 666 667 /* Wait here for the request to complete. */ 668 termination_completed 669 = wait_for_completion_timeout( 670 io_request_completion, 671 msecs_to_jiffies(ISCI_TERMINATION_TIMEOUT_MSEC)); 672 673 if (!termination_completed) { 674 675 /* The request to terminate has timed out. */ 676 spin_lock_irqsave(&ihost->scic_lock, flags); 677 678 /* Check for state changes. */ 679 if (!test_bit(IREQ_TERMINATED, 680 &isci_request->flags)) { 681 682 /* The best we can do is to have the 683 * request die a silent death if it 684 * ever really completes. 685 */ 686 isci_request_mark_zombie(ihost, 687 isci_request); 688 needs_cleanup_handling = true; 689 } else 690 termination_completed = 1; 691 692 spin_unlock_irqrestore(&ihost->scic_lock, 693 flags); 694 695 if (!termination_completed) { 696 697 dev_dbg(&ihost->pdev->dev, 698 "%s: *** Timeout waiting for " 699 "termination(%p/%p)\n", 700 __func__, io_request_completion, 701 isci_request); 702 703 /* The request can no longer be referenced 704 * safely since it may go away if the 705 * termination every really does complete. 706 */ 707 isci_request = NULL; 708 } 709 } 710 if (termination_completed) 711 dev_dbg(&ihost->pdev->dev, 712 "%s: after completion wait (%p/%p)\n", 713 __func__, isci_request, io_request_completion); 714 } 715 716 if (termination_completed) { 717 718 isci_request->io_request_completion = NULL; 719 720 /* Peek at the status of the request. This will tell 721 * us if there was special handling on the request such that it 722 * needs to be detached and freed here. 723 */ 724 spin_lock_irqsave(&isci_request->state_lock, flags); 725 726 needs_cleanup_handling 727 = isci_request_is_dealloc_managed( 728 isci_request->status); 729 730 spin_unlock_irqrestore(&isci_request->state_lock, flags); 731 732 } 733 if (needs_cleanup_handling) { 734 735 dev_dbg(&ihost->pdev->dev, 736 "%s: cleanup isci_device=%p, request=%p\n", 737 __func__, idev, isci_request); 738 739 if (isci_request != NULL) { 740 spin_lock_irqsave(&ihost->scic_lock, flags); 741 isci_free_tag(ihost, isci_request->io_tag); 742 isci_request_change_state(isci_request, unallocated); 743 list_del_init(&isci_request->dev_node); 744 spin_unlock_irqrestore(&ihost->scic_lock, flags); 745 } 746 } 747 } 748} 749 750/** 751 * isci_terminate_pending_requests() - This function will change the all of the 752 * requests on the given device's state to "aborting", will terminate the 753 * requests, and wait for them to complete. This function must only be 754 * called from a thread that can wait. Note that the requests are all 755 * terminated and completed (back to the host, if started there). 756 * @isci_host: This parameter specifies SCU. 757 * @idev: This parameter specifies the target. 758 * 759 */ 760void isci_terminate_pending_requests(struct isci_host *ihost, 761 struct isci_remote_device *idev) 762{ 763 struct completion request_completion; 764 enum isci_request_status old_state; 765 unsigned long flags; 766 LIST_HEAD(list); 767 768 spin_lock_irqsave(&ihost->scic_lock, flags); 769 list_splice_init(&idev->reqs_in_process, &list); 770 771 /* assumes that isci_terminate_request_core deletes from the list */ 772 while (!list_empty(&list)) { 773 struct isci_request *ireq = list_entry(list.next, typeof(*ireq), dev_node); 774 775 /* Change state to "terminating" if it is currently 776 * "started". 777 */ 778 old_state = isci_request_change_started_to_newstate(ireq, 779 &request_completion, 780 terminating); 781 switch (old_state) { 782 case started: 783 case completed: 784 case aborting: 785 break; 786 default: 787 /* termination in progress, or otherwise dispositioned. 788 * We know the request was on 'list' so should be safe 789 * to move it back to reqs_in_process 790 */ 791 list_move(&ireq->dev_node, &idev->reqs_in_process); 792 ireq = NULL; 793 break; 794 } 795 796 if (!ireq) 797 continue; 798 spin_unlock_irqrestore(&ihost->scic_lock, flags); 799 800 init_completion(&request_completion); 801 802 dev_dbg(&ihost->pdev->dev, 803 "%s: idev=%p request=%p; task=%p old_state=%d\n", 804 __func__, idev, ireq, 805 (!test_bit(IREQ_TMF, &ireq->flags) 806 ? isci_request_access_task(ireq) 807 : NULL), 808 old_state); 809 810 /* If the old_state is started: 811 * This request was not already being aborted. If it had been, 812 * then the aborting I/O (ie. the TMF request) would not be in 813 * the aborting state, and thus would be terminated here. Note 814 * that since the TMF completion's call to the kernel function 815 * "complete()" does not happen until the pending I/O request 816 * terminate fully completes, we do not have to implement a 817 * special wait here for already aborting requests - the 818 * termination of the TMF request will force the request 819 * to finish it's already started terminate. 820 * 821 * If old_state == completed: 822 * This request completed from the SCU hardware perspective 823 * and now just needs cleaning up in terms of freeing the 824 * request and potentially calling up to libsas. 825 * 826 * If old_state == aborting: 827 * This request has already gone through a TMF timeout, but may 828 * not have been terminated; needs cleaning up at least. 829 */ 830 isci_terminate_request_core(ihost, idev, ireq); 831 spin_lock_irqsave(&ihost->scic_lock, flags); 832 } 833 spin_unlock_irqrestore(&ihost->scic_lock, flags); 834} 835 836/** 837 * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain 838 * Template functions. 839 * @lun: This parameter specifies the lun to be reset. 840 * 841 * status, zero indicates success. 842 */ 843static int isci_task_send_lu_reset_sas( 844 struct isci_host *isci_host, 845 struct isci_remote_device *isci_device, 846 u8 *lun) 847{ 848 struct isci_tmf tmf; 849 int ret = TMF_RESP_FUNC_FAILED; 850 851 dev_dbg(&isci_host->pdev->dev, 852 "%s: isci_host = %p, isci_device = %p\n", 853 __func__, isci_host, isci_device); 854 /* Send the LUN reset to the target. By the time the call returns, 855 * the TMF has fully exected in the target (in which case the return 856 * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or 857 * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED"). 858 */ 859 isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset, NULL, NULL); 860 861 #define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */ 862 ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS); 863 864 if (ret == TMF_RESP_FUNC_COMPLETE) 865 dev_dbg(&isci_host->pdev->dev, 866 "%s: %p: TMF_LU_RESET passed\n", 867 __func__, isci_device); 868 else 869 dev_dbg(&isci_host->pdev->dev, 870 "%s: %p: TMF_LU_RESET failed (%x)\n", 871 __func__, isci_device, ret); 872 873 return ret; 874} 875 876static int isci_task_send_lu_reset_sata(struct isci_host *ihost, 877 struct isci_remote_device *idev, u8 *lun) 878{ 879 int ret = TMF_RESP_FUNC_FAILED; 880 struct isci_tmf tmf; 881 882 /* Send the soft reset to the target */ 883 #define ISCI_SRST_TIMEOUT_MS 25000 /* 25 second timeout. */ 884 isci_task_build_tmf(&tmf, isci_tmf_sata_srst_high, NULL, NULL); 885 886 ret = isci_task_execute_tmf(ihost, idev, &tmf, ISCI_SRST_TIMEOUT_MS); 887 888 if (ret != TMF_RESP_FUNC_COMPLETE) { 889 dev_dbg(&ihost->pdev->dev, 890 "%s: Assert SRST failed (%p) = %x", 891 __func__, idev, ret); 892 893 /* Return the failure so that the LUN reset is escalated 894 * to a target reset. 895 */ 896 } 897 return ret; 898} 899 900/** 901 * isci_task_lu_reset() - This function is one of the SAS Domain Template 902 * functions. This is one of the Task Management functoins called by libsas, 903 * to reset the given lun. Note the assumption that while this call is 904 * executing, no I/O will be sent by the host to the device. 905 * @lun: This parameter specifies the lun to be reset. 906 * 907 * status, zero indicates success. 908 */ 909int isci_task_lu_reset(struct domain_device *domain_device, u8 *lun) 910{ 911 struct isci_host *isci_host = dev_to_ihost(domain_device); 912 struct isci_remote_device *isci_device; 913 unsigned long flags; 914 int ret; 915 916 spin_lock_irqsave(&isci_host->scic_lock, flags); 917 isci_device = isci_lookup_device(domain_device); 918 spin_unlock_irqrestore(&isci_host->scic_lock, flags); 919 920 dev_dbg(&isci_host->pdev->dev, 921 "%s: domain_device=%p, isci_host=%p; isci_device=%p\n", 922 __func__, domain_device, isci_host, isci_device); 923 924 if (!isci_device) { 925 /* If the device is gone, stop the escalations. */ 926 dev_dbg(&isci_host->pdev->dev, "%s: No dev\n", __func__); 927 928 ret = TMF_RESP_FUNC_COMPLETE; 929 goto out; 930 } 931 set_bit(IDEV_EH, &isci_device->flags); 932 933 /* Send the task management part of the reset. */ 934 if (sas_protocol_ata(domain_device->tproto)) { 935 ret = isci_task_send_lu_reset_sata(isci_host, isci_device, lun); 936 } else 937 ret = isci_task_send_lu_reset_sas(isci_host, isci_device, lun); 938 939 /* If the LUN reset worked, all the I/O can now be terminated. */ 940 if (ret == TMF_RESP_FUNC_COMPLETE) 941 /* Terminate all I/O now. */ 942 isci_terminate_pending_requests(isci_host, 943 isci_device); 944 945 out: 946 isci_put_device(isci_device); 947 return ret; 948} 949 950 951/* int (*lldd_clear_nexus_port)(struct asd_sas_port *); */ 952int isci_task_clear_nexus_port(struct asd_sas_port *port) 953{ 954 return TMF_RESP_FUNC_FAILED; 955} 956 957 958 959int isci_task_clear_nexus_ha(struct sas_ha_struct *ha) 960{ 961 return TMF_RESP_FUNC_FAILED; 962} 963 964/* Task Management Functions. Must be called from process context. */ 965 966/** 967 * isci_abort_task_process_cb() - This is a helper function for the abort task 968 * TMF command. It manages the request state with respect to the successful 969 * transmission / completion of the abort task request. 970 * @cb_state: This parameter specifies when this function was called - after 971 * the TMF request has been started and after it has timed-out. 972 * @tmf: This parameter specifies the TMF in progress. 973 * 974 * 975 */ 976static void isci_abort_task_process_cb( 977 enum isci_tmf_cb_state cb_state, 978 struct isci_tmf *tmf, 979 void *cb_data) 980{ 981 struct isci_request *old_request; 982 983 old_request = (struct isci_request *)cb_data; 984 985 dev_dbg(&old_request->isci_host->pdev->dev, 986 "%s: tmf=%p, old_request=%p\n", 987 __func__, tmf, old_request); 988 989 switch (cb_state) { 990 991 case isci_tmf_started: 992 /* The TMF has been started. Nothing to do here, since the 993 * request state was already set to "aborted" by the abort 994 * task function. 995 */ 996 if ((old_request->status != aborted) 997 && (old_request->status != completed)) 998 dev_dbg(&old_request->isci_host->pdev->dev, 999 "%s: Bad request status (%d): tmf=%p, old_request=%p\n", 1000 __func__, old_request->status, tmf, old_request); 1001 break; 1002 1003 case isci_tmf_timed_out: 1004 1005 /* Set the task's state to "aborting", since the abort task 1006 * function thread set it to "aborted" (above) in anticipation 1007 * of the task management request working correctly. Since the 1008 * timeout has now fired, the TMF request failed. We set the 1009 * state such that the request completion will indicate the 1010 * device is no longer present. 1011 */ 1012 isci_request_change_state(old_request, aborting); 1013 break; 1014 1015 default: 1016 dev_dbg(&old_request->isci_host->pdev->dev, 1017 "%s: Bad cb_state (%d): tmf=%p, old_request=%p\n", 1018 __func__, cb_state, tmf, old_request); 1019 break; 1020 } 1021} 1022 1023/** 1024 * isci_task_abort_task() - This function is one of the SAS Domain Template 1025 * functions. This function is called by libsas to abort a specified task. 1026 * @task: This parameter specifies the SAS task to abort. 1027 * 1028 * status, zero indicates success. 1029 */ 1030int isci_task_abort_task(struct sas_task *task) 1031{ 1032 struct isci_host *isci_host = dev_to_ihost(task->dev); 1033 DECLARE_COMPLETION_ONSTACK(aborted_io_completion); 1034 struct isci_request *old_request = NULL; 1035 enum isci_request_status old_state; 1036 struct isci_remote_device *isci_device = NULL; 1037 struct isci_tmf tmf; 1038 int ret = TMF_RESP_FUNC_FAILED; 1039 unsigned long flags; 1040 int perform_termination = 0; 1041 1042 /* Get the isci_request reference from the task. Note that 1043 * this check does not depend on the pending request list 1044 * in the device, because tasks driving resets may land here 1045 * after completion in the core. 1046 */ 1047 spin_lock_irqsave(&isci_host->scic_lock, flags); 1048 spin_lock(&task->task_state_lock); 1049 1050 old_request = task->lldd_task; 1051 1052 /* If task is already done, the request isn't valid */ 1053 if (!(task->task_state_flags & SAS_TASK_STATE_DONE) && 1054 (task->task_state_flags & SAS_TASK_AT_INITIATOR) && 1055 old_request) 1056 isci_device = isci_lookup_device(task->dev); 1057 1058 spin_unlock(&task->task_state_lock); 1059 spin_unlock_irqrestore(&isci_host->scic_lock, flags); 1060 1061 dev_dbg(&isci_host->pdev->dev, 1062 "%s: dev = %p, task = %p, old_request == %p\n", 1063 __func__, isci_device, task, old_request); 1064 1065 if (isci_device) 1066 set_bit(IDEV_EH, &isci_device->flags); 1067 1068 /* Device reset conditions signalled in task_state_flags are the 1069 * responsbility of libsas to observe at the start of the error 1070 * handler thread. 1071 */ 1072 if (!isci_device || !old_request) { 1073 /* The request has already completed and there 1074 * is nothing to do here other than to set the task 1075 * done bit, and indicate that the task abort function 1076 * was sucessful. 1077 */ 1078 spin_lock_irqsave(&task->task_state_lock, flags); 1079 task->task_state_flags |= SAS_TASK_STATE_DONE; 1080 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR | 1081 SAS_TASK_STATE_PENDING); 1082 spin_unlock_irqrestore(&task->task_state_lock, flags); 1083 1084 ret = TMF_RESP_FUNC_COMPLETE; 1085 1086 dev_dbg(&isci_host->pdev->dev, 1087 "%s: abort task not needed for %p\n", 1088 __func__, task); 1089 goto out; 1090 } 1091 1092 spin_lock_irqsave(&isci_host->scic_lock, flags); 1093 1094 /* Check the request status and change to "aborted" if currently 1095 * "starting"; if true then set the I/O kernel completion 1096 * struct that will be triggered when the request completes. 1097 */ 1098 old_state = isci_task_validate_request_to_abort( 1099 old_request, isci_host, isci_device, 1100 &aborted_io_completion); 1101 if ((old_state != started) && 1102 (old_state != completed) && 1103 (old_state != aborting)) { 1104 1105 spin_unlock_irqrestore(&isci_host->scic_lock, flags); 1106 1107 /* The request was already being handled by someone else (because 1108 * they got to set the state away from started). 1109 */ 1110 dev_dbg(&isci_host->pdev->dev, 1111 "%s: device = %p; old_request %p already being aborted\n", 1112 __func__, 1113 isci_device, old_request); 1114 ret = TMF_RESP_FUNC_COMPLETE; 1115 goto out; 1116 } 1117 if (task->task_proto == SAS_PROTOCOL_SMP || 1118 sas_protocol_ata(task->task_proto) || 1119 test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) { 1120 1121 spin_unlock_irqrestore(&isci_host->scic_lock, flags); 1122 1123 dev_dbg(&isci_host->pdev->dev, 1124 "%s: %s request" 1125 " or complete_in_target (%d), thus no TMF\n", 1126 __func__, 1127 ((task->task_proto == SAS_PROTOCOL_SMP) 1128 ? "SMP" 1129 : (sas_protocol_ata(task->task_proto) 1130 ? "SATA/STP" 1131 : "<other>") 1132 ), 1133 test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)); 1134 1135 if (test_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags)) { 1136 spin_lock_irqsave(&task->task_state_lock, flags); 1137 task->task_state_flags |= SAS_TASK_STATE_DONE; 1138 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR | 1139 SAS_TASK_STATE_PENDING); 1140 spin_unlock_irqrestore(&task->task_state_lock, flags); 1141 ret = TMF_RESP_FUNC_COMPLETE; 1142 } else { 1143 spin_lock_irqsave(&task->task_state_lock, flags); 1144 task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR | 1145 SAS_TASK_STATE_PENDING); 1146 spin_unlock_irqrestore(&task->task_state_lock, flags); 1147 } 1148 1149 /* STP and SMP devices are not sent a TMF, but the 1150 * outstanding I/O request is terminated below. This is 1151 * because SATA/STP and SMP discovery path timeouts directly 1152 * call the abort task interface for cleanup. 1153 */ 1154 perform_termination = 1; 1155 1156 } else { 1157 /* Fill in the tmf stucture */ 1158 isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort, 1159 isci_abort_task_process_cb, 1160 old_request); 1161 1162 spin_unlock_irqrestore(&isci_host->scic_lock, flags); 1163 1164 #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */ 1165 ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, 1166 ISCI_ABORT_TASK_TIMEOUT_MS); 1167 1168 if (ret == TMF_RESP_FUNC_COMPLETE) 1169 perform_termination = 1; 1170 else 1171 dev_dbg(&isci_host->pdev->dev, 1172 "%s: isci_task_send_tmf failed\n", __func__); 1173 } 1174 if (perform_termination) { 1175 set_bit(IREQ_COMPLETE_IN_TARGET, &old_request->flags); 1176 1177 /* Clean up the request on our side, and wait for the aborted 1178 * I/O to complete. 1179 */ 1180 isci_terminate_request_core(isci_host, isci_device, 1181 old_request); 1182 } 1183 1184 /* Make sure we do not leave a reference to aborted_io_completion */ 1185 old_request->io_request_completion = NULL; 1186 out: 1187 isci_put_device(isci_device); 1188 return ret; 1189} 1190 1191/** 1192 * isci_task_abort_task_set() - This function is one of the SAS Domain Template 1193 * functions. This is one of the Task Management functoins called by libsas, 1194 * to abort all task for the given lun. 1195 * @d_device: This parameter specifies the domain device associated with this 1196 * request. 1197 * @lun: This parameter specifies the lun associated with this request. 1198 * 1199 * status, zero indicates success. 1200 */ 1201int isci_task_abort_task_set( 1202 struct domain_device *d_device, 1203 u8 *lun) 1204{ 1205 return TMF_RESP_FUNC_FAILED; 1206} 1207 1208 1209/** 1210 * isci_task_clear_aca() - This function is one of the SAS Domain Template 1211 * functions. This is one of the Task Management functoins called by libsas. 1212 * @d_device: This parameter specifies the domain device associated with this 1213 * request. 1214 * @lun: This parameter specifies the lun associated with this request. 1215 * 1216 * status, zero indicates success. 1217 */ 1218int isci_task_clear_aca( 1219 struct domain_device *d_device, 1220 u8 *lun) 1221{ 1222 return TMF_RESP_FUNC_FAILED; 1223} 1224 1225 1226 1227/** 1228 * isci_task_clear_task_set() - This function is one of the SAS Domain Template 1229 * functions. This is one of the Task Management functoins called by libsas. 1230 * @d_device: This parameter specifies the domain device associated with this 1231 * request. 1232 * @lun: This parameter specifies the lun associated with this request. 1233 * 1234 * status, zero indicates success. 1235 */ 1236int isci_task_clear_task_set( 1237 struct domain_device *d_device, 1238 u8 *lun) 1239{ 1240 return TMF_RESP_FUNC_FAILED; 1241} 1242 1243 1244/** 1245 * isci_task_query_task() - This function is implemented to cause libsas to 1246 * correctly escalate the failed abort to a LUN or target reset (this is 1247 * because sas_scsi_find_task libsas function does not correctly interpret 1248 * all return codes from the abort task call). When TMF_RESP_FUNC_SUCC is 1249 * returned, libsas turns this into a LUN reset; when FUNC_FAILED is 1250 * returned, libsas will turn this into a target reset 1251 * @task: This parameter specifies the sas task being queried. 1252 * @lun: This parameter specifies the lun associated with this request. 1253 * 1254 * status, zero indicates success. 1255 */ 1256int isci_task_query_task( 1257 struct sas_task *task) 1258{ 1259 /* See if there is a pending device reset for this device. */ 1260 if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET) 1261 return TMF_RESP_FUNC_FAILED; 1262 else 1263 return TMF_RESP_FUNC_SUCC; 1264} 1265 1266/* 1267 * isci_task_request_complete() - This function is called by the sci core when 1268 * an task request completes. 1269 * @ihost: This parameter specifies the ISCI host object 1270 * @ireq: This parameter is the completed isci_request object. 1271 * @completion_status: This parameter specifies the completion status from the 1272 * sci core. 1273 * 1274 * none. 1275 */ 1276void 1277isci_task_request_complete(struct isci_host *ihost, 1278 struct isci_request *ireq, 1279 enum sci_task_status completion_status) 1280{ 1281 struct isci_tmf *tmf = isci_request_access_tmf(ireq); 1282 struct completion *tmf_complete = NULL; 1283 struct completion *request_complete = ireq->io_request_completion; 1284 1285 dev_dbg(&ihost->pdev->dev, 1286 "%s: request = %p, status=%d\n", 1287 __func__, ireq, completion_status); 1288 1289 isci_request_change_state(ireq, completed); 1290 1291 set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags); 1292 1293 if (tmf) { 1294 tmf->status = completion_status; 1295 1296 if (tmf->proto == SAS_PROTOCOL_SSP) { 1297 memcpy(&tmf->resp.resp_iu, 1298 &ireq->ssp.rsp, 1299 SSP_RESP_IU_MAX_SIZE); 1300 } else if (tmf->proto == SAS_PROTOCOL_SATA) { 1301 memcpy(&tmf->resp.d2h_fis, 1302 &ireq->stp.rsp, 1303 sizeof(struct dev_to_host_fis)); 1304 } 1305 /* PRINT_TMF( ((struct isci_tmf *)request->task)); */ 1306 tmf_complete = tmf->complete; 1307 } 1308 sci_controller_complete_io(ihost, ireq->target_device, ireq); 1309 /* set the 'terminated' flag handle to make sure it cannot be terminated 1310 * or completed again. 1311 */ 1312 set_bit(IREQ_TERMINATED, &ireq->flags); 1313 1314 /* As soon as something is in the terminate path, deallocation is 1315 * managed there. Note that the final non-managed state of a task 1316 * request is "completed". 1317 */ 1318 if ((ireq->status == completed) || 1319 !isci_request_is_dealloc_managed(ireq->status)) { 1320 isci_request_change_state(ireq, unallocated); 1321 isci_free_tag(ihost, ireq->io_tag); 1322 list_del_init(&ireq->dev_node); 1323 } 1324 1325 /* "request_complete" is set if the task was being terminated. */ 1326 if (request_complete) 1327 complete(request_complete); 1328 1329 /* The task management part completes last. */ 1330 if (tmf_complete) 1331 complete(tmf_complete); 1332} 1333 1334static int isci_reset_device(struct isci_host *ihost, 1335 struct isci_remote_device *idev) 1336{ 1337 struct sas_phy *phy = sas_find_local_phy(idev->domain_dev); 1338 enum sci_status status; 1339 unsigned long flags; 1340 int rc; 1341 1342 dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev); 1343 1344 spin_lock_irqsave(&ihost->scic_lock, flags); 1345 status = sci_remote_device_reset(idev); 1346 if (status != SCI_SUCCESS) { 1347 spin_unlock_irqrestore(&ihost->scic_lock, flags); 1348 1349 dev_dbg(&ihost->pdev->dev, 1350 "%s: sci_remote_device_reset(%p) returned %d!\n", 1351 __func__, idev, status); 1352 1353 return TMF_RESP_FUNC_FAILED; 1354 } 1355 spin_unlock_irqrestore(&ihost->scic_lock, flags); 1356 1357 rc = sas_phy_reset(phy, true); 1358 1359 /* Terminate in-progress I/O now. */ 1360 isci_remote_device_nuke_requests(ihost, idev); 1361 1362 /* Since all pending TCs have been cleaned, resume the RNC. */ 1363 spin_lock_irqsave(&ihost->scic_lock, flags); 1364 status = sci_remote_device_reset_complete(idev); 1365 spin_unlock_irqrestore(&ihost->scic_lock, flags); 1366 1367 if (status != SCI_SUCCESS) { 1368 dev_dbg(&ihost->pdev->dev, 1369 "%s: sci_remote_device_reset_complete(%p) " 1370 "returned %d!\n", __func__, idev, status); 1371 } 1372 1373 dev_dbg(&ihost->pdev->dev, "%s: idev %p complete.\n", __func__, idev); 1374 1375 return rc; 1376} 1377 1378int isci_task_I_T_nexus_reset(struct domain_device *dev) 1379{ 1380 struct isci_host *ihost = dev_to_ihost(dev); 1381 struct isci_remote_device *idev; 1382 unsigned long flags; 1383 int ret; 1384 1385 spin_lock_irqsave(&ihost->scic_lock, flags); 1386 idev = isci_lookup_device(dev); 1387 spin_unlock_irqrestore(&ihost->scic_lock, flags); 1388 1389 if (!idev || !test_bit(IDEV_EH, &idev->flags)) { 1390 ret = TMF_RESP_FUNC_COMPLETE; 1391 goto out; 1392 } 1393 1394 ret = isci_reset_device(ihost, idev); 1395 out: 1396 isci_put_device(idev); 1397 return ret; 1398} 1399 1400int isci_bus_reset_handler(struct scsi_cmnd *cmd) 1401{ 1402 struct domain_device *dev = sdev_to_domain_dev(cmd->device); 1403 struct isci_host *ihost = dev_to_ihost(dev); 1404 struct isci_remote_device *idev; 1405 unsigned long flags; 1406 int ret; 1407 1408 spin_lock_irqsave(&ihost->scic_lock, flags); 1409 idev = isci_lookup_device(dev); 1410 spin_unlock_irqrestore(&ihost->scic_lock, flags); 1411 1412 if (!idev) { 1413 ret = TMF_RESP_FUNC_COMPLETE; 1414 goto out; 1415 } 1416 1417 ret = isci_reset_device(ihost, idev); 1418 out: 1419 isci_put_device(idev); 1420 return ret; 1421} 1422