linux/drivers/scsi/isci/task.c
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   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        unsigned long flags;
  82
  83        /* Normal notification (task_done) */
  84        dev_dbg(&ihost->pdev->dev, "%s: task = %p, response=%d, status=%d\n",
  85                __func__, task, response, status);
  86
  87        spin_lock_irqsave(&task->task_state_lock, flags);
  88
  89        task->task_status.resp = response;
  90        task->task_status.stat = status;
  91
  92        /* Normal notification (task_done) */
  93        task->task_state_flags |= SAS_TASK_STATE_DONE;
  94        task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
  95                                    SAS_TASK_STATE_PENDING);
  96        task->lldd_task = NULL;
  97        spin_unlock_irqrestore(&task->task_state_lock, flags);
  98
  99        task->task_done(task);
 100}
 101
 102#define for_each_sas_task(num, task) \
 103        for (; num > 0; num--,\
 104             task = list_entry(task->list.next, struct sas_task, list))
 105
 106
 107static inline int isci_device_io_ready(struct isci_remote_device *idev,
 108                                       struct sas_task *task)
 109{
 110        return idev ? test_bit(IDEV_IO_READY, &idev->flags) ||
 111                      (test_bit(IDEV_IO_NCQERROR, &idev->flags) &&
 112                       isci_task_is_ncq_recovery(task))
 113                    : 0;
 114}
 115/**
 116 * isci_task_execute_task() - This function is one of the SAS Domain Template
 117 *    functions. This function is called by libsas to send a task down to
 118 *    hardware.
 119 * @task: This parameter specifies the SAS task to send.
 120 * @gfp_flags: This parameter specifies the context of this call.
 121 *
 122 * status, zero indicates success.
 123 */
 124int isci_task_execute_task(struct sas_task *task, gfp_t gfp_flags)
 125{
 126        struct isci_host *ihost = dev_to_ihost(task->dev);
 127        struct isci_remote_device *idev;
 128        unsigned long flags;
 129        enum sci_status status = SCI_FAILURE;
 130        bool io_ready;
 131        u16 tag;
 132
 133        spin_lock_irqsave(&ihost->scic_lock, flags);
 134        idev = isci_lookup_device(task->dev);
 135        io_ready = isci_device_io_ready(idev, task);
 136        tag = isci_alloc_tag(ihost);
 137        spin_unlock_irqrestore(&ihost->scic_lock, flags);
 138
 139        dev_dbg(&ihost->pdev->dev,
 140                "task: %p, dev: %p idev: %p:%#lx cmd = %p\n",
 141                task, task->dev, idev, idev ? idev->flags : 0,
 142                task->uldd_task);
 143
 144        if (!idev) {
 145                isci_task_refuse(ihost, task, SAS_TASK_UNDELIVERED,
 146                                 SAS_DEVICE_UNKNOWN);
 147        } else if (!io_ready || tag == SCI_CONTROLLER_INVALID_IO_TAG) {
 148                /* Indicate QUEUE_FULL so that the scsi midlayer
 149                 * retries.
 150                  */
 151                isci_task_refuse(ihost, task, SAS_TASK_COMPLETE,
 152                                 SAS_QUEUE_FULL);
 153        } else {
 154                /* There is a device and it's ready for I/O. */
 155                spin_lock_irqsave(&task->task_state_lock, flags);
 156
 157                if (task->task_state_flags & SAS_TASK_STATE_ABORTED) {
 158                        /* The I/O was aborted. */
 159                        spin_unlock_irqrestore(&task->task_state_lock, flags);
 160
 161                        isci_task_refuse(ihost, task,
 162                                         SAS_TASK_UNDELIVERED,
 163                                         SAM_STAT_TASK_ABORTED);
 164                } else {
 165                        task->task_state_flags |= SAS_TASK_AT_INITIATOR;
 166                        spin_unlock_irqrestore(&task->task_state_lock, flags);
 167
 168                        /* build and send the request. */
 169                        status = isci_request_execute(ihost, idev, task, tag);
 170
 171                        if (status != SCI_SUCCESS) {
 172                                spin_lock_irqsave(&task->task_state_lock, flags);
 173                                /* Did not really start this command. */
 174                                task->task_state_flags &= ~SAS_TASK_AT_INITIATOR;
 175                                spin_unlock_irqrestore(&task->task_state_lock, flags);
 176
 177                                if (test_bit(IDEV_GONE, &idev->flags)) {
 178                                        /* Indicate that the device
 179                                         * is gone.
 180                                         */
 181                                        isci_task_refuse(ihost, task,
 182                                                SAS_TASK_UNDELIVERED,
 183                                                SAS_DEVICE_UNKNOWN);
 184                                } else {
 185                                        /* Indicate QUEUE_FULL so that
 186                                         * the scsi midlayer retries.
 187                                         * If the request failed for
 188                                         * remote device reasons, it
 189                                         * gets returned as
 190                                         * SAS_TASK_UNDELIVERED next
 191                                         * time through.
 192                                         */
 193                                        isci_task_refuse(ihost, task,
 194                                                SAS_TASK_COMPLETE,
 195                                                SAS_QUEUE_FULL);
 196                                }
 197                        }
 198                }
 199        }
 200
 201        if (status != SCI_SUCCESS && tag != SCI_CONTROLLER_INVALID_IO_TAG) {
 202                spin_lock_irqsave(&ihost->scic_lock, flags);
 203                /* command never hit the device, so just free
 204                 * the tci and skip the sequence increment
 205                 */
 206                isci_tci_free(ihost, ISCI_TAG_TCI(tag));
 207                spin_unlock_irqrestore(&ihost->scic_lock, flags);
 208        }
 209
 210        isci_put_device(idev);
 211        return 0;
 212}
 213
 214static struct isci_request *isci_task_request_build(struct isci_host *ihost,
 215                                                    struct isci_remote_device *idev,
 216                                                    u16 tag, struct isci_tmf *isci_tmf)
 217{
 218        enum sci_status status = SCI_FAILURE;
 219        struct isci_request *ireq = NULL;
 220        struct domain_device *dev;
 221
 222        dev_dbg(&ihost->pdev->dev,
 223                "%s: isci_tmf = %p\n", __func__, isci_tmf);
 224
 225        dev = idev->domain_dev;
 226
 227        /* do common allocation and init of request object. */
 228        ireq = isci_tmf_request_from_tag(ihost, isci_tmf, tag);
 229        if (!ireq)
 230                return NULL;
 231
 232        /* let the core do it's construct. */
 233        status = sci_task_request_construct(ihost, idev, tag,
 234                                             ireq);
 235
 236        if (status != SCI_SUCCESS) {
 237                dev_warn(&ihost->pdev->dev,
 238                         "%s: sci_task_request_construct failed - "
 239                         "status = 0x%x\n",
 240                         __func__,
 241                         status);
 242                return NULL;
 243        }
 244
 245        /* XXX convert to get this from task->tproto like other drivers */
 246        if (dev->dev_type == SAS_END_DEVICE) {
 247                isci_tmf->proto = SAS_PROTOCOL_SSP;
 248                status = sci_task_request_construct_ssp(ireq);
 249                if (status != SCI_SUCCESS)
 250                        return NULL;
 251        }
 252
 253        return ireq;
 254}
 255
 256static int isci_task_execute_tmf(struct isci_host *ihost,
 257                                 struct isci_remote_device *idev,
 258                                 struct isci_tmf *tmf, unsigned long timeout_ms)
 259{
 260        DECLARE_COMPLETION_ONSTACK(completion);
 261        enum sci_task_status status = SCI_TASK_FAILURE;
 262        struct isci_request *ireq;
 263        int ret = TMF_RESP_FUNC_FAILED;
 264        unsigned long flags;
 265        unsigned long timeleft;
 266        u16 tag;
 267
 268        spin_lock_irqsave(&ihost->scic_lock, flags);
 269        tag = isci_alloc_tag(ihost);
 270        spin_unlock_irqrestore(&ihost->scic_lock, flags);
 271
 272        if (tag == SCI_CONTROLLER_INVALID_IO_TAG)
 273                return ret;
 274
 275        /* sanity check, return TMF_RESP_FUNC_FAILED
 276         * if the device is not there and ready.
 277         */
 278        if (!idev ||
 279            (!test_bit(IDEV_IO_READY, &idev->flags) &&
 280             !test_bit(IDEV_IO_NCQERROR, &idev->flags))) {
 281                dev_dbg(&ihost->pdev->dev,
 282                        "%s: idev = %p not ready (%#lx)\n",
 283                        __func__,
 284                        idev, idev ? idev->flags : 0);
 285                goto err_tci;
 286        } else
 287                dev_dbg(&ihost->pdev->dev,
 288                        "%s: idev = %p\n",
 289                        __func__, idev);
 290
 291        /* Assign the pointer to the TMF's completion kernel wait structure. */
 292        tmf->complete = &completion;
 293        tmf->status = SCI_FAILURE_TIMEOUT;
 294
 295        ireq = isci_task_request_build(ihost, idev, tag, tmf);
 296        if (!ireq)
 297                goto err_tci;
 298
 299        spin_lock_irqsave(&ihost->scic_lock, flags);
 300
 301        /* start the TMF io. */
 302        status = sci_controller_start_task(ihost, idev, ireq);
 303
 304        if (status != SCI_TASK_SUCCESS) {
 305                dev_dbg(&ihost->pdev->dev,
 306                         "%s: start_io failed - status = 0x%x, request = %p\n",
 307                         __func__,
 308                         status,
 309                         ireq);
 310                spin_unlock_irqrestore(&ihost->scic_lock, flags);
 311                goto err_tci;
 312        }
 313        spin_unlock_irqrestore(&ihost->scic_lock, flags);
 314
 315        /* The RNC must be unsuspended before the TMF can get a response. */
 316        isci_remote_device_resume_from_abort(ihost, idev);
 317
 318        /* Wait for the TMF to complete, or a timeout. */
 319        timeleft = wait_for_completion_timeout(&completion,
 320                                               msecs_to_jiffies(timeout_ms));
 321
 322        if (timeleft == 0) {
 323                /* The TMF did not complete - this could be because
 324                 * of an unplug.  Terminate the TMF request now.
 325                 */
 326                isci_remote_device_suspend_terminate(ihost, idev, ireq);
 327        }
 328
 329        isci_print_tmf(ihost, tmf);
 330
 331        if (tmf->status == SCI_SUCCESS)
 332                ret =  TMF_RESP_FUNC_COMPLETE;
 333        else if (tmf->status == SCI_FAILURE_IO_RESPONSE_VALID) {
 334                dev_dbg(&ihost->pdev->dev,
 335                        "%s: tmf.status == "
 336                        "SCI_FAILURE_IO_RESPONSE_VALID\n",
 337                        __func__);
 338                ret =  TMF_RESP_FUNC_COMPLETE;
 339        }
 340        /* Else - leave the default "failed" status alone. */
 341
 342        dev_dbg(&ihost->pdev->dev,
 343                "%s: completed request = %p\n",
 344                __func__,
 345                ireq);
 346
 347        return ret;
 348
 349 err_tci:
 350        spin_lock_irqsave(&ihost->scic_lock, flags);
 351        isci_tci_free(ihost, ISCI_TAG_TCI(tag));
 352        spin_unlock_irqrestore(&ihost->scic_lock, flags);
 353
 354        return ret;
 355}
 356
 357static void isci_task_build_tmf(struct isci_tmf *tmf,
 358                                enum isci_tmf_function_codes code)
 359{
 360        memset(tmf, 0, sizeof(*tmf));
 361        tmf->tmf_code = code;
 362}
 363
 364static void isci_task_build_abort_task_tmf(struct isci_tmf *tmf,
 365                                           enum isci_tmf_function_codes code,
 366                                           struct isci_request *old_request)
 367{
 368        isci_task_build_tmf(tmf, code);
 369        tmf->io_tag = old_request->io_tag;
 370}
 371
 372/**
 373 * isci_task_send_lu_reset_sas() - This function is called by of the SAS Domain
 374 *    Template functions.
 375 * @lun: This parameter specifies the lun to be reset.
 376 *
 377 * status, zero indicates success.
 378 */
 379static int isci_task_send_lu_reset_sas(
 380        struct isci_host *isci_host,
 381        struct isci_remote_device *isci_device,
 382        u8 *lun)
 383{
 384        struct isci_tmf tmf;
 385        int ret = TMF_RESP_FUNC_FAILED;
 386
 387        dev_dbg(&isci_host->pdev->dev,
 388                "%s: isci_host = %p, isci_device = %p\n",
 389                __func__, isci_host, isci_device);
 390        /* Send the LUN reset to the target.  By the time the call returns,
 391         * the TMF has fully exected in the target (in which case the return
 392         * value is "TMF_RESP_FUNC_COMPLETE", or the request timed-out (or
 393         * was otherwise unable to be executed ("TMF_RESP_FUNC_FAILED").
 394         */
 395        isci_task_build_tmf(&tmf, isci_tmf_ssp_lun_reset);
 396
 397        #define ISCI_LU_RESET_TIMEOUT_MS 2000 /* 2 second timeout. */
 398        ret = isci_task_execute_tmf(isci_host, isci_device, &tmf, ISCI_LU_RESET_TIMEOUT_MS);
 399
 400        if (ret == TMF_RESP_FUNC_COMPLETE)
 401                dev_dbg(&isci_host->pdev->dev,
 402                        "%s: %p: TMF_LU_RESET passed\n",
 403                        __func__, isci_device);
 404        else
 405                dev_dbg(&isci_host->pdev->dev,
 406                        "%s: %p: TMF_LU_RESET failed (%x)\n",
 407                        __func__, isci_device, ret);
 408
 409        return ret;
 410}
 411
 412int isci_task_lu_reset(struct domain_device *dev, u8 *lun)
 413{
 414        struct isci_host *ihost = dev_to_ihost(dev);
 415        struct isci_remote_device *idev;
 416        unsigned long flags;
 417        int ret = TMF_RESP_FUNC_COMPLETE;
 418
 419        spin_lock_irqsave(&ihost->scic_lock, flags);
 420        idev = isci_get_device(dev->lldd_dev);
 421        spin_unlock_irqrestore(&ihost->scic_lock, flags);
 422
 423        dev_dbg(&ihost->pdev->dev,
 424                "%s: domain_device=%p, isci_host=%p; isci_device=%p\n",
 425                __func__, dev, ihost, idev);
 426
 427        if (!idev) {
 428                /* If the device is gone, escalate to I_T_Nexus_Reset. */
 429                dev_dbg(&ihost->pdev->dev, "%s: No dev\n", __func__);
 430
 431                ret = TMF_RESP_FUNC_FAILED;
 432                goto out;
 433        }
 434
 435        /* Suspend the RNC, kill all TCs */
 436        if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
 437            != SCI_SUCCESS) {
 438                /* The suspend/terminate only fails if isci_get_device fails */
 439                ret = TMF_RESP_FUNC_FAILED;
 440                goto out;
 441        }
 442        /* All pending I/Os have been terminated and cleaned up. */
 443        if (!test_bit(IDEV_GONE, &idev->flags)) {
 444                if (dev_is_sata(dev))
 445                        sas_ata_schedule_reset(dev);
 446                else
 447                        /* Send the task management part of the reset. */
 448                        ret = isci_task_send_lu_reset_sas(ihost, idev, lun);
 449        }
 450 out:
 451        isci_put_device(idev);
 452        return ret;
 453}
 454
 455
 456/*       int (*lldd_clear_nexus_port)(struct asd_sas_port *); */
 457int isci_task_clear_nexus_port(struct asd_sas_port *port)
 458{
 459        return TMF_RESP_FUNC_FAILED;
 460}
 461
 462
 463
 464int isci_task_clear_nexus_ha(struct sas_ha_struct *ha)
 465{
 466        return TMF_RESP_FUNC_FAILED;
 467}
 468
 469/* Task Management Functions. Must be called from process context.       */
 470
 471/**
 472 * isci_task_abort_task() - This function is one of the SAS Domain Template
 473 *    functions. This function is called by libsas to abort a specified task.
 474 * @task: This parameter specifies the SAS task to abort.
 475 *
 476 * status, zero indicates success.
 477 */
 478int isci_task_abort_task(struct sas_task *task)
 479{
 480        struct isci_host *ihost = dev_to_ihost(task->dev);
 481        DECLARE_COMPLETION_ONSTACK(aborted_io_completion);
 482        struct isci_request       *old_request = NULL;
 483        struct isci_remote_device *idev = NULL;
 484        struct isci_tmf           tmf;
 485        int                       ret = TMF_RESP_FUNC_FAILED;
 486        unsigned long             flags;
 487        int                       target_done_already = 0;
 488
 489        /* Get the isci_request reference from the task.  Note that
 490         * this check does not depend on the pending request list
 491         * in the device, because tasks driving resets may land here
 492         * after completion in the core.
 493         */
 494        spin_lock_irqsave(&ihost->scic_lock, flags);
 495        spin_lock(&task->task_state_lock);
 496
 497        old_request = task->lldd_task;
 498
 499        /* If task is already done, the request isn't valid */
 500        if (!(task->task_state_flags & SAS_TASK_STATE_DONE) &&
 501            (task->task_state_flags & SAS_TASK_AT_INITIATOR) &&
 502            old_request) {
 503                idev = isci_get_device(task->dev->lldd_dev);
 504                target_done_already = test_bit(IREQ_COMPLETE_IN_TARGET,
 505                                               &old_request->flags);
 506        }
 507        spin_unlock(&task->task_state_lock);
 508        spin_unlock_irqrestore(&ihost->scic_lock, flags);
 509
 510        dev_warn(&ihost->pdev->dev,
 511                 "%s: dev = %p (%s%s), task = %p, old_request == %p\n",
 512                 __func__, idev,
 513                 (dev_is_sata(task->dev) ? "STP/SATA"
 514                                         : ((dev_is_expander(task->dev))
 515                                                ? "SMP"
 516                                                : "SSP")),
 517                 ((idev) ? ((test_bit(IDEV_GONE, &idev->flags))
 518                           ? " IDEV_GONE"
 519                           : "")
 520                         : " <NULL>"),
 521                 task, old_request);
 522
 523        /* Device reset conditions signalled in task_state_flags are the
 524         * responsbility of libsas to observe at the start of the error
 525         * handler thread.
 526         */
 527        if (!idev || !old_request) {
 528                /* The request has already completed and there
 529                * is nothing to do here other than to set the task
 530                * done bit, and indicate that the task abort function
 531                * was successful.
 532                */
 533                spin_lock_irqsave(&task->task_state_lock, flags);
 534                task->task_state_flags |= SAS_TASK_STATE_DONE;
 535                task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
 536                                            SAS_TASK_STATE_PENDING);
 537                spin_unlock_irqrestore(&task->task_state_lock, flags);
 538
 539                ret = TMF_RESP_FUNC_COMPLETE;
 540
 541                dev_warn(&ihost->pdev->dev,
 542                         "%s: abort task not needed for %p\n",
 543                         __func__, task);
 544                goto out;
 545        }
 546        /* Suspend the RNC, kill the TC */
 547        if (isci_remote_device_suspend_terminate(ihost, idev, old_request)
 548            != SCI_SUCCESS) {
 549                dev_warn(&ihost->pdev->dev,
 550                         "%s: isci_remote_device_reset_terminate(dev=%p, "
 551                                 "req=%p, task=%p) failed\n",
 552                         __func__, idev, old_request, task);
 553                ret = TMF_RESP_FUNC_FAILED;
 554                goto out;
 555        }
 556        spin_lock_irqsave(&ihost->scic_lock, flags);
 557
 558        if (task->task_proto == SAS_PROTOCOL_SMP ||
 559            sas_protocol_ata(task->task_proto) ||
 560            target_done_already ||
 561            test_bit(IDEV_GONE, &idev->flags)) {
 562
 563                spin_unlock_irqrestore(&ihost->scic_lock, flags);
 564
 565                /* No task to send, so explicitly resume the device here */
 566                isci_remote_device_resume_from_abort(ihost, idev);
 567
 568                dev_warn(&ihost->pdev->dev,
 569                         "%s: %s request"
 570                                 " or complete_in_target (%d), "
 571                                 "or IDEV_GONE (%d), thus no TMF\n",
 572                         __func__,
 573                         ((task->task_proto == SAS_PROTOCOL_SMP)
 574                          ? "SMP"
 575                          : (sas_protocol_ata(task->task_proto)
 576                                ? "SATA/STP"
 577                                : "<other>")
 578                          ),
 579                         test_bit(IREQ_COMPLETE_IN_TARGET,
 580                                  &old_request->flags),
 581                         test_bit(IDEV_GONE, &idev->flags));
 582
 583                spin_lock_irqsave(&task->task_state_lock, flags);
 584                task->task_state_flags &= ~(SAS_TASK_AT_INITIATOR |
 585                                            SAS_TASK_STATE_PENDING);
 586                task->task_state_flags |= SAS_TASK_STATE_DONE;
 587                spin_unlock_irqrestore(&task->task_state_lock, flags);
 588
 589                ret = TMF_RESP_FUNC_COMPLETE;
 590        } else {
 591                /* Fill in the tmf structure */
 592                isci_task_build_abort_task_tmf(&tmf, isci_tmf_ssp_task_abort,
 593                                               old_request);
 594
 595                spin_unlock_irqrestore(&ihost->scic_lock, flags);
 596
 597                /* Send the task management request. */
 598                #define ISCI_ABORT_TASK_TIMEOUT_MS 500 /* 1/2 second timeout */
 599                ret = isci_task_execute_tmf(ihost, idev, &tmf,
 600                                            ISCI_ABORT_TASK_TIMEOUT_MS);
 601        }
 602out:
 603        dev_warn(&ihost->pdev->dev,
 604                 "%s: Done; dev = %p, task = %p , old_request == %p\n",
 605                 __func__, idev, task, old_request);
 606        isci_put_device(idev);
 607        return ret;
 608}
 609
 610/**
 611 * isci_task_abort_task_set() - This function is one of the SAS Domain Template
 612 *    functions. This is one of the Task Management functoins called by libsas,
 613 *    to abort all task for the given lun.
 614 * @d_device: This parameter specifies the domain device associated with this
 615 *    request.
 616 * @lun: This parameter specifies the lun associated with this request.
 617 *
 618 * status, zero indicates success.
 619 */
 620int isci_task_abort_task_set(
 621        struct domain_device *d_device,
 622        u8 *lun)
 623{
 624        return TMF_RESP_FUNC_FAILED;
 625}
 626
 627
 628/**
 629 * isci_task_clear_aca() - This function is one of the SAS Domain Template
 630 *    functions. This is one of the Task Management functoins called by libsas.
 631 * @d_device: This parameter specifies the domain device associated with this
 632 *    request.
 633 * @lun: This parameter specifies the lun        associated with this request.
 634 *
 635 * status, zero indicates success.
 636 */
 637int isci_task_clear_aca(
 638        struct domain_device *d_device,
 639        u8 *lun)
 640{
 641        return TMF_RESP_FUNC_FAILED;
 642}
 643
 644
 645
 646/**
 647 * isci_task_clear_task_set() - This function is one of the SAS Domain Template
 648 *    functions. This is one of the Task Management functoins called by libsas.
 649 * @d_device: This parameter specifies the domain device associated with this
 650 *    request.
 651 * @lun: This parameter specifies the lun        associated with this request.
 652 *
 653 * status, zero indicates success.
 654 */
 655int isci_task_clear_task_set(
 656        struct domain_device *d_device,
 657        u8 *lun)
 658{
 659        return TMF_RESP_FUNC_FAILED;
 660}
 661
 662
 663/**
 664 * isci_task_query_task() - This function is implemented to cause libsas to
 665 *    correctly escalate the failed abort to a LUN or target reset (this is
 666 *    because sas_scsi_find_task libsas function does not correctly interpret
 667 *    all return codes from the abort task call).  When TMF_RESP_FUNC_SUCC is
 668 *    returned, libsas turns this into a LUN reset; when FUNC_FAILED is
 669 *    returned, libsas will turn this into a target reset
 670 * @task: This parameter specifies the sas task being queried.
 671 * @lun: This parameter specifies the lun associated with this request.
 672 *
 673 * status, zero indicates success.
 674 */
 675int isci_task_query_task(
 676        struct sas_task *task)
 677{
 678        /* See if there is a pending device reset for this device. */
 679        if (task->task_state_flags & SAS_TASK_NEED_DEV_RESET)
 680                return TMF_RESP_FUNC_FAILED;
 681        else
 682                return TMF_RESP_FUNC_SUCC;
 683}
 684
 685/*
 686 * isci_task_request_complete() - This function is called by the sci core when
 687 *    an task request completes.
 688 * @ihost: This parameter specifies the ISCI host object
 689 * @ireq: This parameter is the completed isci_request object.
 690 * @completion_status: This parameter specifies the completion status from the
 691 *    sci core.
 692 *
 693 * none.
 694 */
 695void
 696isci_task_request_complete(struct isci_host *ihost,
 697                           struct isci_request *ireq,
 698                           enum sci_task_status completion_status)
 699{
 700        struct isci_tmf *tmf = isci_request_access_tmf(ireq);
 701        struct completion *tmf_complete = NULL;
 702
 703        dev_dbg(&ihost->pdev->dev,
 704                "%s: request = %p, status=%d\n",
 705                __func__, ireq, completion_status);
 706
 707        set_bit(IREQ_COMPLETE_IN_TARGET, &ireq->flags);
 708
 709        if (tmf) {
 710                tmf->status = completion_status;
 711
 712                if (tmf->proto == SAS_PROTOCOL_SSP) {
 713                        memcpy(&tmf->resp.resp_iu,
 714                               &ireq->ssp.rsp,
 715                               SSP_RESP_IU_MAX_SIZE);
 716                } else if (tmf->proto == SAS_PROTOCOL_SATA) {
 717                        memcpy(&tmf->resp.d2h_fis,
 718                               &ireq->stp.rsp,
 719                               sizeof(struct dev_to_host_fis));
 720                }
 721                /* PRINT_TMF( ((struct isci_tmf *)request->task)); */
 722                tmf_complete = tmf->complete;
 723        }
 724        sci_controller_complete_io(ihost, ireq->target_device, ireq);
 725        /* set the 'terminated' flag handle to make sure it cannot be terminated
 726         *  or completed again.
 727         */
 728        set_bit(IREQ_TERMINATED, &ireq->flags);
 729
 730        if (test_and_clear_bit(IREQ_ABORT_PATH_ACTIVE, &ireq->flags))
 731                wake_up_all(&ihost->eventq);
 732
 733        if (!test_bit(IREQ_NO_AUTO_FREE_TAG, &ireq->flags))
 734                isci_free_tag(ihost, ireq->io_tag);
 735
 736        /* The task management part completes last. */
 737        if (tmf_complete)
 738                complete(tmf_complete);
 739}
 740
 741static int isci_reset_device(struct isci_host *ihost,
 742                             struct domain_device *dev,
 743                             struct isci_remote_device *idev)
 744{
 745        int rc = TMF_RESP_FUNC_COMPLETE, reset_stat = -1;
 746        struct sas_phy *phy = sas_get_local_phy(dev);
 747        struct isci_port *iport = dev->port->lldd_port;
 748
 749        dev_dbg(&ihost->pdev->dev, "%s: idev %p\n", __func__, idev);
 750
 751        /* Suspend the RNC, terminate all outstanding TCs. */
 752        if (isci_remote_device_suspend_terminate(ihost, idev, NULL)
 753            != SCI_SUCCESS) {
 754                rc = TMF_RESP_FUNC_FAILED;
 755                goto out;
 756        }
 757        /* Note that since the termination for outstanding requests succeeded,
 758         * this function will return success.  This is because the resets will
 759         * only fail if the device has been removed (ie. hotplug), and the
 760         * primary duty of this function is to cleanup tasks, so that is the
 761         * relevant status.
 762         */
 763        if (!test_bit(IDEV_GONE, &idev->flags)) {
 764                if (scsi_is_sas_phy_local(phy)) {
 765                        struct isci_phy *iphy = &ihost->phys[phy->number];
 766
 767                        reset_stat = isci_port_perform_hard_reset(ihost, iport,
 768                                                                  iphy);
 769                } else
 770                        reset_stat = sas_phy_reset(phy, !dev_is_sata(dev));
 771        }
 772        /* Explicitly resume the RNC here, since there was no task sent. */
 773        isci_remote_device_resume_from_abort(ihost, idev);
 774
 775        dev_dbg(&ihost->pdev->dev, "%s: idev %p complete, reset_stat=%d.\n",
 776                __func__, idev, reset_stat);
 777 out:
 778        sas_put_local_phy(phy);
 779        return rc;
 780}
 781
 782int isci_task_I_T_nexus_reset(struct domain_device *dev)
 783{
 784        struct isci_host *ihost = dev_to_ihost(dev);
 785        struct isci_remote_device *idev;
 786        unsigned long flags;
 787        int ret;
 788
 789        spin_lock_irqsave(&ihost->scic_lock, flags);
 790        idev = isci_get_device(dev->lldd_dev);
 791        spin_unlock_irqrestore(&ihost->scic_lock, flags);
 792
 793        if (!idev) {
 794                /* XXX: need to cleanup any ireqs targeting this
 795                 * domain_device
 796                 */
 797                ret = -ENODEV;
 798                goto out;
 799        }
 800
 801        ret = isci_reset_device(ihost, dev, idev);
 802 out:
 803        isci_put_device(idev);
 804        return ret;
 805}
 806