sys/dev/disk/nata/ata-queue.c

   1 /*-
   2  * Copyright (c) 1998 - 2006 Søren Schmidt <sos@FreeBSD.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer,
  10  *    without modification, immediately at the beginning of the file.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  *
  26  * $FreeBSD: src/sys/dev/ata/ata-queue.c,v 1.67 2007/01/27 21:15:58 remko Exp $
  27  */
  28
  29 #include "opt_ata.h"
  30
  31 #include <sys/param.h>
  32 #include <sys/bus.h>
  33 #include <sys/callout.h>
  34 #include <sys/nata.h>
  35 #include <sys/queue.h>
  36 #include <sys/lock.h>
  37 #include <sys/buf.h>
  38 #include <sys/systm.h>
  39 #include <sys/taskqueue.h>
  40
  41 #include "ata-all.h"
  42 #include "ata_if.h"
  43
  44 /* prototypes */
  45 static void ata_completed(void *, int);
  46 static void ata_sort_queue(struct ata_channel *ch, struct ata_request *request);
  47 static void atawritereorder(struct ata_channel *ch);
  48 static char *ata_skey2str(u_int8_t);
  49
  50 void
  51 ata_queue_init(struct ata_channel *ch)
  52 {
  53     TAILQ_INIT(&ch->ata_queue);
  54     ch->reorder = 0;
  55     ch->transition = NULL;
  56 }
  57
  58 /*
  59  * Rudely drop all requests queued to the channel of specified device.
  60  * XXX: The requests are leaked, use only in fatal case.
  61  */
  62 void
  63 ata_drop_requests(device_t dev)
  64 {
  65     struct ata_channel *ch = device_get_softc(device_get_parent(dev));
  66     struct ata_request *request, *tmp;
  67
  68     lockmgr(&ch->queue_mtx, LK_EXCLUSIVE);
  69     TAILQ_FOREACH_MUTABLE(request, &ch->ata_queue, chain, tmp) {
  70         TAILQ_REMOVE(&ch->ata_queue, request, chain);
  71         request->result = ENXIO;
  72     }
  73     lockmgr(&ch->queue_mtx, LK_RELEASE);
  74 }
  75
  76 void
  77 ata_queue_request(struct ata_request *request)
  78 {
  79     struct ata_channel *ch;
  80
  81     /* treat request as virgin (this might be an ATA_R_REQUEUE) */
  82     request->result = request->status = request->error = 0;
  83
  84     /* check that the device is still valid */
  85     if (!(request->parent = device_get_parent(request->dev))) {
  86         request->result = ENXIO;
  87         if (request->callback)
  88             (request->callback)(request);
  89         return;
  90     }
  91     ch = device_get_softc(request->parent);
  92     /* serialization done via state_mtx */
  93     callout_init_lk(&request->callout, &ch->state_mtx);
  94     if (!request->callback && !(request->flags & ATA_R_REQUEUE))
  95         lockinit(&request->done, "ataqueuerqdone", 0, 0);
  96
  97     /* in ATA_STALL_QUEUE state we call HW directly */
  98     if ((ch->state & ATA_STALL_QUEUE) && (request->flags & ATA_R_CONTROL)) {
  99         lockmgr(&ch->state_mtx, LK_EXCLUSIVE);
 100         ch->running = request;
 101         if (ch->hw.begin_transaction(request) == ATA_OP_FINISHED) {
 102             ch->running = NULL;
 103             if (!request->callback)
 104                 lockuninit(&request->done);
 105             lockmgr(&ch->state_mtx, LK_RELEASE);
 106             return;
 107         }
 108         /* interlock against interrupt */
 109         request->flags |= ATA_R_HWCMDQUEUED;
 110         lockmgr(&ch->state_mtx, LK_RELEASE);
 111     }
 112     /* otherwise put request on the locked queue at the specified location */
 113     else  {
 114         lockmgr(&ch->queue_mtx, LK_EXCLUSIVE);
 115         if (request->flags & ATA_R_AT_HEAD) {
 116             TAILQ_INSERT_HEAD(&ch->ata_queue, request, chain);
 117         } else if (request->flags & ATA_R_ORDERED) {
 118             ata_sort_queue(ch, request);
 119         } else {
 120             TAILQ_INSERT_TAIL(&ch->ata_queue, request, chain);
 121             ch->transition = NULL;
 122         }
 123         lockmgr(&ch->queue_mtx, LK_RELEASE);
 124         ATA_DEBUG_RQ(request, "queued");
 125         ata_start(ch->dev);
 126     }
 127
 128     /* if this is a requeued request callback/sleep we're done */
 129     if (request->flags & ATA_R_REQUEUE)
 130         return;
 131
 132     /* if this is not a callback wait until request is completed */
 133     if (!request->callback) {
 134         ATA_DEBUG_RQ(request, "wait for completion");
 135         if (!dumping) {
 136             /* interlock against wakeup */
 137             lockmgr(&request->done, LK_EXCLUSIVE);
 138             /* check if the request was completed already */
 139             if (!(request->flags & ATA_R_COMPLETED))
 140                 lksleep(request, &request->done, 0, "ATA request completion "
 141                        "wait", request->timeout * hz * 4);
 142             lockmgr(&request->done, LK_RELEASE);
 143             /* check if the request was completed while sleeping */
 144             if (!(request->flags & ATA_R_COMPLETED)) {
 145                 /* apparently not */
 146                 device_printf(request->dev, "WARNING - %s taskqueue timeout - "
 147                               "completing request directly\n",
 148                               ata_cmd2str(request));
 149                 request->flags |= ATA_R_DANGER1;
 150                 ata_completed(request, 0);
 151             }
 152         }
 153         lockuninit(&request->done);
 154     }
 155 }
 156
 157 int
 158 ata_controlcmd(device_t dev, u_int8_t command, u_int16_t feature,
 159                u_int64_t lba, u_int16_t count)
 160 {
 161     struct ata_device *atadev = device_get_softc(dev);
 162     struct ata_request *request = ata_alloc_request();
 163     int error = ENOMEM;
 164
 165     if (request) {
 166         request->dev = dev;
 167         request->u.ata.command = command;
 168         request->u.ata.lba = lba;
 169         request->u.ata.count = count;
 170         request->u.ata.feature = feature;
 171         request->flags = ATA_R_CONTROL;
 172         if (atadev->spindown_state) {
 173             device_printf(dev, "request while spun down, starting.\n");
 174             atadev->spindown_state = 0;
 175             request->timeout = MAX(ATA_DEFAULT_TIMEOUT, 31);
 176         } else {
 177             request->timeout = ATA_DEFAULT_TIMEOUT;
 178         }
 179         request->retries = 0;
 180         ata_queue_request(request);
 181         error = request->result;
 182         ata_free_request(request);
 183     }
 184     return error;
 185 }
 186
 187 int
 188 ata_atapicmd(device_t dev, u_int8_t *ccb, caddr_t data,
 189              int count, int flags, int timeout)
 190 {
 191     struct ata_request *request = ata_alloc_request();
 192     struct ata_device *atadev = device_get_softc(dev);
 193     int error = ENOMEM;
 194
 195     if (request) {
 196         request->dev = dev;
 197         if ((atadev->param.config & ATA_PROTO_MASK) == ATA_PROTO_ATAPI_12)
 198             bcopy(ccb, request->u.atapi.ccb, 12);
 199         else
 200             bcopy(ccb, request->u.atapi.ccb, 16);
 201         request->data = data;
 202         request->bytecount = count;
 203         request->transfersize = min(request->bytecount, 65534);
 204         request->flags = flags | ATA_R_ATAPI;
 205         request->timeout = timeout;
 206         request->retries = 0;
 207         ata_queue_request(request);
 208         error = request->result;
 209         ata_free_request(request);
 210     }
 211     return error;
 212 }
 213
 214 void
 215 ata_start(device_t dev)
 216 {
 217     struct ata_channel *ch = device_get_softc(dev);
 218     struct ata_request *request;
 219     struct ata_composite *cptr;
 220     int dependencies = 0;
 221
 222     /* if we have a request on the queue try to get it running */
 223     lockmgr(&ch->queue_mtx, LK_EXCLUSIVE);
 224     if ((request = TAILQ_FIRST(&ch->ata_queue))) {
 225
 226         /* we need the locking function to get the lock for this channel */
 227         if (ATA_LOCKING(dev, ATA_LF_LOCK) == ch->unit) {
 228
 229             /* check for composite dependencies */
 230             if ((cptr = request->composite)) {
 231                 lockmgr(&cptr->lock, LK_EXCLUSIVE);
 232                 if ((request->flags & ATA_R_WRITE) &&
 233                     (cptr->wr_depend & cptr->rd_done) != cptr->wr_depend) {
 234                     dependencies = 1;
 235                 }
 236                 lockmgr(&cptr->lock, LK_RELEASE);
 237             }
 238
 239             /* check we are in the right state and has no dependencies */
 240             lockmgr(&ch->state_mtx, LK_EXCLUSIVE);
 241             if (ch->state == ATA_IDLE && !dependencies) {
 242                 ATA_DEBUG_RQ(request, "starting");
 243
 244                 if (ch->transition == request)
 245                     ch->transition = TAILQ_NEXT(request, chain);
 246                 TAILQ_REMOVE(&ch->ata_queue, request, chain);
 247                 ch->running = request;
 248                 ch->state = ATA_ACTIVE;
 249
 250                 if (ch->hw.begin_transaction(request) == ATA_OP_FINISHED) {
 251                     ch->running = NULL;
 252                     ch->state = ATA_IDLE;
 253                     lockmgr(&ch->state_mtx, LK_RELEASE);
 254                     lockmgr(&ch->queue_mtx, LK_RELEASE);
 255                     ATA_LOCKING(dev, ATA_LF_UNLOCK);
 256                     ata_finish(request);
 257                     return;
 258                 }
 259
 260                 /* interlock against interrupt */
 261                 request->flags |= ATA_R_HWCMDQUEUED;
 262
 263                 if (dumping) {
 264                     lockmgr(&ch->state_mtx, LK_RELEASE);
 265                     lockmgr(&ch->queue_mtx, LK_RELEASE);
 266                     while (!ata_interrupt(ch))
 267                         DELAY(10);
 268                     return;
 269                 }
 270             }
 271             lockmgr(&ch->state_mtx, LK_RELEASE);
 272         }
 273     }
 274     lockmgr(&ch->queue_mtx, LK_RELEASE);
 275 }
 276
 277 void
 278 ata_finish(struct ata_request *request)
 279 {
 280     struct ata_channel *ch = device_get_softc(request->parent);
 281
 282     /*
 283      * if in ATA_STALL_QUEUE state or request has ATA_R_DIRECT flags set
 284      * we need to call ata_complete() directly here (no taskqueue involvement)
 285      */
 286     if (dumping ||
 287         (ch->state & ATA_STALL_QUEUE) || (request->flags & ATA_R_DIRECT)) {
 288         ATA_DEBUG_RQ(request, "finish directly");
 289         ata_completed(request, 0);
 290     }
 291     else {
 292         /* put request on the proper taskqueue for completion */
 293         /* XXX FreeBSD has some sort of bio_taskqueue code here */
 294         TASK_INIT(&request->task, 0, ata_completed, request);
 295         ATA_DEBUG_RQ(request, "finish taskqueue_swi_mp");
 296         taskqueue_enqueue(taskqueue_swi_mp, &request->task);
 297     }
 298 }
 299
 300 static void
 301 ata_completed(void *context, int dummy)
 302 {
 303     struct ata_request *request = (struct ata_request *)context;
 304     struct ata_channel *ch = device_get_softc(request->parent);
 305     struct ata_device *atadev = device_get_softc(request->dev);
 306     struct ata_composite *composite;
 307
 308     if (request->flags & ATA_R_DANGER2) {
 309         device_printf(request->dev,
 310                       "WARNING - %s freeing taskqueue zombie request\n",
 311                       ata_cmd2str(request));
 312         request->flags &= ~(ATA_R_DANGER1 | ATA_R_DANGER2);
 313         ata_free_request(request);
 314         return;
 315     }
 316     if (request->flags & ATA_R_DANGER1)
 317         request->flags |= ATA_R_DANGER2;
 318
 319     ATA_DEBUG_RQ(request, "completed entered");
 320
 321     /* if we had a timeout, reinit channel and deal with the falldown */
 322     if (request->flags & ATA_R_TIMEOUT) {
 323         /*
 324          * if the channel is still present and
 325          * reinit succeeds and
 326          * the device doesn't get detached and
 327          * there are retries left we reinject this request
 328          */
 329         if (ch && !ata_reinit(ch->dev) && !request->result &&
 330             (request->retries-- > 0)) {
 331             if (!(request->flags & ATA_R_QUIET)) {
 332                 device_printf(request->dev,
 333                               "TIMEOUT - %s retrying (%d retr%s left)",
 334                               ata_cmd2str(request), request->retries,
 335                               request->retries == 1 ? "y" : "ies");
 336                 if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
 337                     kprintf(" LBA=%ju", request->u.ata.lba);
 338                 kprintf("\n");
 339             }
 340             request->flags &= ~(ATA_R_TIMEOUT | ATA_R_DEBUG);
 341             request->flags |= (ATA_R_AT_HEAD | ATA_R_REQUEUE);
 342             ATA_DEBUG_RQ(request, "completed reinject");
 343             ata_queue_request(request);
 344             return;
 345         }
 346
 347         /* ran out of good intentions so finish with error */
 348         if (!request->result) {
 349             if (!(request->flags & ATA_R_QUIET)) {
 350                 if (request->dev) {
 351                     device_printf(request->dev, "FAILURE - %s timed out",
 352                                   ata_cmd2str(request));
 353                     if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
 354                         kprintf(" LBA=%ju", request->u.ata.lba);
 355                     kprintf("\n");
 356                 }
 357             }
 358             request->result = EIO;
 359         }
 360     }
 361     else if (!(request->flags & ATA_R_ATAPI) ){
 362         /* if this is a soft ECC error warn about it */
 363         /* XXX SOS we could do WARF here */
 364         if ((request->status & (ATA_S_CORR | ATA_S_ERROR)) == ATA_S_CORR) {
 365             device_printf(request->dev,
 366                           "WARNING - %s soft error (ECC corrected)",
 367                           ata_cmd2str(request));
 368             if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
 369                 kprintf(" LBA=%ju", request->u.ata.lba);
 370             kprintf("\n");
 371         }
 372
 373         /* if this is a UDMA CRC error we reinject if there are retries left */
 374         if (request->flags & ATA_R_DMA && request->error & ATA_E_ICRC) {
 375             if (request->retries-- > 0) {
 376                 device_printf(request->dev,
 377                               "WARNING - %s UDMA ICRC error (retrying request)",
 378                               ata_cmd2str(request));
 379                 if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
 380                     kprintf(" LBA=%ju", request->u.ata.lba);
 381                 kprintf("\n");
 382                 request->flags |= (ATA_R_AT_HEAD | ATA_R_REQUEUE);
 383                 ata_queue_request(request);
 384                 return;
 385             }
 386         }
 387     }
 388
 389     switch (request->flags & ATA_R_ATAPI) {
 390
 391     /* ATA errors */
 392     default:
 393         if (!request->result && request->status & ATA_S_ERROR) {
 394             if (!(request->flags & ATA_R_QUIET)) {
 395                 device_printf(request->dev,
 396                               "FAILURE - %s status=%pb%i error=%pb%i",
 397                               ata_cmd2str(request),
 398                               "\20\10BUSY\7READY\6DMA_READY"
 399                               "\5DSC\4DRQ\3CORRECTABLE\2INDEX\1ERROR",
 400                               request->status,
 401                               "\20\10ICRC\7UNCORRECTABLE"
 402                               "\6MEDIA_CHANGED\5NID_NOT_FOUND"
 403                               "\4MEDIA_CHANGE_REQEST"
 404                               "\3ABORTED\2NO_MEDIA\1ILLEGAL_LENGTH",
 405                               request->error);
 406                 if ((request->flags & ATA_R_DMA) &&
 407                     (request->dmastat & ATA_BMSTAT_ERROR))
 408                     kprintf(" dma=0x%02x", request->dmastat);
 409                 if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
 410                     kprintf(" LBA=%ju", request->u.ata.lba);
 411                 kprintf("\n");
 412             }
 413             request->result = EIO;
 414         }
 415         break;
 416
 417     /* ATAPI errors */
 418     case ATA_R_ATAPI:
 419         /* skip if result already set */
 420         if (request->result)
 421             break;
 422
 423         /* if we have a sensekey -> request sense from device */
 424         if ((request->error & ATA_E_ATAPI_SENSE_MASK) &&
 425             (request->u.atapi.ccb[0] != ATAPI_REQUEST_SENSE)) {
 426             static u_int8_t ccb[16] = { ATAPI_REQUEST_SENSE, 0, 0, 0,
 427                                         sizeof(struct atapi_sense),
 428                                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
 429
 430             request->u.atapi.saved_cmd = request->u.atapi.ccb[0];
 431             bcopy(ccb, request->u.atapi.ccb, 16);
 432             request->data = (caddr_t)&request->u.atapi.sense;
 433             request->bytecount = sizeof(struct atapi_sense);
 434             request->donecount = 0;
 435             request->transfersize = sizeof(struct atapi_sense);
 436             request->timeout = ATA_DEFAULT_TIMEOUT;
 437             request->flags &= (ATA_R_ATAPI | ATA_R_QUIET);
 438             request->flags |= (ATA_R_READ | ATA_R_AT_HEAD | ATA_R_REQUEUE);
 439             ATA_DEBUG_RQ(request, "autoissue request sense");
 440             ata_queue_request(request);
 441             return;
 442         }
 443
 444         switch (request->u.atapi.sense.key & ATA_SENSE_KEY_MASK) {
 445         case ATA_SENSE_RECOVERED_ERROR:
 446             device_printf(request->dev, "WARNING - %s recovered error\n",
 447                           ata_cmd2str(request));
 448             /* FALLTHROUGH */
 449
 450         case ATA_SENSE_NO_SENSE:
 451             request->result = 0;
 452             break;
 453
 454         case ATA_SENSE_NOT_READY:
 455             request->result = EBUSY;
 456             break;
 457
 458         case ATA_SENSE_UNIT_ATTENTION:
 459             atadev->flags |= ATA_D_MEDIA_CHANGED;
 460             request->result = EIO;
 461             break;
 462
 463         default:
 464             request->result = EIO;
 465             if (request->flags & ATA_R_QUIET)
 466                 break;
 467
 468             device_printf(request->dev,
 469                           "FAILURE - %s %s asc=0x%02x ascq=0x%02x ",
 470                           ata_cmd2str(request), ata_skey2str(
 471                           (request->u.atapi.sense.key & ATA_SENSE_KEY_MASK)),
 472                           request->u.atapi.sense.asc,
 473                           request->u.atapi.sense.ascq);
 474             if (request->u.atapi.sense.specific & ATA_SENSE_SPEC_VALID)
 475                 kprintf("sks=0x%02x 0x%02x 0x%02x\n",
 476                        request->u.atapi.sense.specific & ATA_SENSE_SPEC_MASK,
 477                        request->u.atapi.sense.specific1,
 478                        request->u.atapi.sense.specific2);
 479             else
 480                 kprintf("\n");
 481         }
 482
 483         if ((request->u.atapi.sense.key & ATA_SENSE_KEY_MASK ?
 484              request->u.atapi.sense.key & ATA_SENSE_KEY_MASK :
 485              request->error))
 486             request->result = EIO;
 487     }
 488
 489     ATA_DEBUG_RQ(request, "completed callback/wakeup");
 490
 491     /* if we are part of a composite operation we need to maintain progress */
 492     if ((composite = request->composite)) {
 493         int index = 0;
 494
 495         lockmgr(&composite->lock, LK_EXCLUSIVE);
 496
 497         /* update whats done */
 498         if (request->flags & ATA_R_READ)
 499             composite->rd_done |= (1 << request->this);
 500         if (request->flags & ATA_R_WRITE)
 501             composite->wr_done |= (1 << request->this);
 502
 503         /* find ready to go dependencies */
 504         if (composite->wr_depend &&
 505             (composite->rd_done & composite->wr_depend)==composite->wr_depend &&
 506             (composite->wr_needed & (~composite->wr_done))) {
 507             index = composite->wr_needed & ~composite->wr_done;
 508         }
 509
 510         lockmgr(&composite->lock, LK_RELEASE);
 511
 512         /* if we have any ready candidates kick them off */
 513         if (index) {
 514             int bit;
 515
 516             for (bit = 0; bit < MAX_COMPOSITES; bit++) {
 517                 if (index & (1 << bit))
 518                     ata_start(device_get_parent(composite->request[bit]->dev));
 519             }
 520         }
 521     }
 522
 523     /* get results back to the initiator for this request */
 524     if (request->callback)
 525         (request->callback)(request);
 526     else {
 527         lockmgr(&request->done, LK_EXCLUSIVE);
 528         request->flags |= ATA_R_COMPLETED;
 529         lockmgr(&request->done, LK_RELEASE);
 530         wakeup_one(request);
 531     }
 532
 533     /* only call ata_start if channel is present */
 534     if (ch)
 535         ata_start(ch->dev);
 536 }
 537
 538 void
 539 ata_timeout(struct ata_request *request)
 540 {
 541     struct ata_channel *ch = device_get_softc(request->parent);
 542
 543     /*
 544      * NOTE: callout acquired ch->state_mtx for us.
 545      */
 546     /*request->flags |= ATA_R_DEBUG;*/
 547     ATA_DEBUG_RQ(request, "timeout");
 548
 549     /*
 550      * if we have an ATA_ACTIVE request running, we flag the request
 551      * ATA_R_TIMEOUT so ata_finish will handle it correctly
 552      * also NULL out the running request so we wont loose
 553      * the race with an eventual interrupt arriving late
 554      */
 555     if (ch->state == ATA_ACTIVE) {
 556         request->flags |= ATA_R_TIMEOUT;
 557         lockmgr(&ch->state_mtx, LK_RELEASE);
 558         ATA_LOCKING(ch->dev, ATA_LF_UNLOCK);
 559         ata_finish(request);
 560         lockmgr(&ch->state_mtx, LK_EXCLUSIVE);
 561     }
 562 }
 563
 564 void
 565 ata_fail_requests(device_t dev)
 566 {
 567     struct ata_channel *ch = device_get_softc(device_get_parent(dev));
 568     struct ata_request *request, *tmp;
 569     TAILQ_HEAD(, ata_request) fail_requests;
 570     TAILQ_INIT(&fail_requests);
 571
 572     /* grap all channel locks to avoid races */
 573     lockmgr(&ch->queue_mtx, LK_EXCLUSIVE);
 574     lockmgr(&ch->state_mtx, LK_EXCLUSIVE);
 575
 576     /* do we have any running request to care about ? */
 577     if ((request = ch->running) && (!dev || request->dev == dev)) {
 578         callout_cancel(&request->callout);
 579         ch->running = NULL;
 580         request->result = ENXIO;
 581         TAILQ_INSERT_TAIL(&fail_requests, request, chain);
 582     }
 583
 584     /* fail all requests queued on this channel for device dev if !NULL */
 585     TAILQ_FOREACH_MUTABLE(request, &ch->ata_queue, chain, tmp) {
 586         if (!dev || request->dev == dev) {
 587             if (ch->transition == request)
 588                 ch->transition = TAILQ_NEXT(request, chain);
 589             TAILQ_REMOVE(&ch->ata_queue, request, chain);
 590             request->result = ENXIO;
 591             TAILQ_INSERT_TAIL(&fail_requests, request, chain);
 592         }
 593     }
 594
 595     lockmgr(&ch->state_mtx, LK_RELEASE);
 596     lockmgr(&ch->queue_mtx, LK_RELEASE);
 597
 598     /* finish up all requests collected above */
 599     TAILQ_FOREACH_MUTABLE(request, &fail_requests, chain, tmp) {
 600         TAILQ_REMOVE(&fail_requests, request, chain);
 601         ata_finish(request);
 602     }
 603 }
 604
 605 static u_int64_t
 606 ata_get_lba(struct ata_request *request)
 607 {
 608     if (request->flags & ATA_R_ATAPI) {
 609         switch (request->u.atapi.ccb[0]) {
 610         case ATAPI_READ_BIG:
 611         case ATAPI_WRITE_BIG:
 612         case ATAPI_READ_CD:
 613             return (request->u.atapi.ccb[5]) | (request->u.atapi.ccb[4]<<8) |
 614                    (request->u.atapi.ccb[3]<<16)|(request->u.atapi.ccb[2]<<24);
 615         case ATAPI_READ:
 616         case ATAPI_WRITE:
 617             return (request->u.atapi.ccb[4]) | (request->u.atapi.ccb[3]<<8) |
 618                    (request->u.atapi.ccb[2]<<16);
 619         default:
 620             return 0;
 621         }
 622     }
 623     else
 624         return request->u.ata.lba;
 625 }
 626
 627 /*
 628  * This implements exactly bioqdisksort() in the DragonFly kernel.
 629  * The short description is: Because megabytes and megabytes worth of
 630  * writes can be queued there needs to be a read-prioritization mechanism
 631  * or reads get completely starved out.
 632  */
 633 static void
 634 ata_sort_queue(struct ata_channel *ch, struct ata_request *request)
 635 {
 636     if ((request->flags & ATA_R_WRITE) == 0) {
 637         if (ch->transition) {
 638             /*
 639              * Insert before the first write
 640              */
 641             TAILQ_INSERT_BEFORE(ch->transition, request, chain);
 642             if (++ch->reorder >= bioq_reorder_minor_interval) {
 643                 ch->reorder = 0;
 644                 atawritereorder(ch);
 645             }
 646         } else {
 647             /*
 648              * No writes queued (or ordering was forced),
 649              * insert at tail.
 650              */
 651             TAILQ_INSERT_TAIL(&ch->ata_queue, request, chain);
 652         }
 653     } else {
 654         /*
 655          * Writes are always appended.  If no writes were previously
 656          * queued or an ordered tail insertion occured the transition
 657          * field will be NULL.
 658          */
 659         TAILQ_INSERT_TAIL(&ch->ata_queue, request, chain);
 660         if (ch->transition == NULL)
 661                 ch->transition = request;
 662     }
 663     if (request->composite) {
 664         ch->transition = NULL;
 665         ch->reorder = 0;
 666     }
 667 }
 668
 669 /*
 670  * Move the transition point to prevent reads from completely
 671  * starving our writes.  This brings a number of writes into
 672  * the fold every N reads.
 673  */
 674 static void
 675 atawritereorder(struct ata_channel *ch)
 676 {
 677     struct ata_request *req;
 678     u_int64_t next_offset;
 679     size_t left = (size_t)bioq_reorder_minor_bytes;
 680     size_t n;
 681
 682     next_offset = ata_get_lba(ch->transition);
 683     while ((req = ch->transition) != NULL &&
 684            next_offset == ata_get_lba(req)) {
 685         n = req->u.ata.count;
 686         next_offset = ata_get_lba(req);
 687         ch->transition = TAILQ_NEXT(req, chain);
 688         if (left < n)
 689             break;
 690         left -= n;
 691     }
 692 }
 693
 694 const char *
 695 ata_cmd2str(struct ata_request *request)
 696 {
 697     static char buffer[20];
 698
 699     if (request->flags & ATA_R_ATAPI) {
 700         switch (request->u.atapi.sense.key ?
 701                 request->u.atapi.saved_cmd : request->u.atapi.ccb[0]) {
 702         case 0x00: return ("TEST_UNIT_READY");
 703         case 0x01: return ("REZERO");
 704         case 0x03: return ("REQUEST_SENSE");
 705         case 0x04: return ("FORMAT");
 706         case 0x08: return ("READ");
 707         case 0x0a: return ("WRITE");
 708         case 0x10: return ("WEOF");
 709         case 0x11: return ("SPACE");
 710         case 0x12: return ("INQUIRY");
 711         case 0x15: return ("MODE_SELECT");
 712         case 0x19: return ("ERASE");
 713         case 0x1a: return ("MODE_SENSE");
 714         case 0x1b: return ("START_STOP");
 715         case 0x1e: return ("PREVENT_ALLOW");
 716         case 0x23: return ("ATAPI_READ_FORMAT_CAPACITIES");
 717         case 0x25: return ("READ_CAPACITY");
 718         case 0x28: return ("READ_BIG");
 719         case 0x2a: return ("WRITE_BIG");
 720         case 0x2b: return ("LOCATE");
 721         case 0x34: return ("READ_POSITION");
 722         case 0x35: return ("SYNCHRONIZE_CACHE");
 723         case 0x3b: return ("WRITE_BUFFER");
 724         case 0x3c: return ("READ_BUFFER");
 725         case 0x42: return ("READ_SUBCHANNEL");
 726         case 0x43: return ("READ_TOC");
 727         case 0x45: return ("PLAY_10");
 728         case 0x47: return ("PLAY_MSF");
 729         case 0x48: return ("PLAY_TRACK");
 730         case 0x4b: return ("PAUSE");
 731         case 0x51: return ("READ_DISK_INFO");
 732         case 0x52: return ("READ_TRACK_INFO");
 733         case 0x53: return ("RESERVE_TRACK");
 734         case 0x54: return ("SEND_OPC_INFO");
 735         case 0x55: return ("MODE_SELECT_BIG");
 736         case 0x58: return ("REPAIR_TRACK");
 737         case 0x59: return ("READ_MASTER_CUE");
 738         case 0x5a: return ("MODE_SENSE_BIG");
 739         case 0x5b: return ("CLOSE_TRACK/SESSION");
 740         case 0x5c: return ("READ_BUFFER_CAPACITY");
 741         case 0x5d: return ("SEND_CUE_SHEET");
 742         case 0x96: return ("READ_CAPACITY_16");
 743         case 0xa1: return ("BLANK_CMD");
 744         case 0xa3: return ("SEND_KEY");
 745         case 0xa4: return ("REPORT_KEY");
 746         case 0xa5: return ("PLAY_12");
 747         case 0xa6: return ("LOAD_UNLOAD");
 748         case 0xad: return ("READ_DVD_STRUCTURE");
 749         case 0xb4: return ("PLAY_CD");
 750         case 0xbb: return ("SET_SPEED");
 751         case 0xbd: return ("MECH_STATUS");
 752         case 0xbe: return ("READ_CD");
 753         case 0xff: return ("POLL_DSC");
 754         }
 755     }
 756     else {
 757         switch (request->u.ata.command) {
 758         case 0x00: return ("NOP");
 759         case 0x08: return ("DEVICE_RESET");
 760         case 0x20: return ("READ");
 761         case 0x24: return ("READ48");
 762         case 0x25: return ("READ_DMA48");
 763         case 0x26: return ("READ_DMA_QUEUED48");
 764         case 0x27: return ("READ_NATIVE_MAX_ADDRESS48");
 765         case 0x29: return ("READ_MUL48");
 766         case 0x30: return ("WRITE");
 767         case 0x34: return ("WRITE48");
 768         case 0x35: return ("WRITE_DMA48");
 769         case 0x36: return ("WRITE_DMA_QUEUED48");
 770         case 0x39: return ("WRITE_MUL48");
 771         case 0x70: return ("SEEK");
 772         case 0xa0: return ("PACKET_CMD");
 773         case 0xa1: return ("ATAPI_IDENTIFY");
 774         case 0xa2: return ("SERVICE");
 775         case 0xb0: return ("SMART");
 776         case 0xc0: return ("CFA ERASE");
 777         case 0xc4: return ("READ_MUL");
 778         case 0xc5: return ("WRITE_MUL");
 779         case 0xc6: return ("SET_MULTI");
 780         case 0xc7: return ("READ_DMA_QUEUED");
 781         case 0xc8: return ("READ_DMA");
 782         case 0xca: return ("WRITE_DMA");
 783         case 0xcc: return ("WRITE_DMA_QUEUED");
 784         case 0xe6: return ("SLEEP");
 785         case 0xe7: return ("FLUSHCACHE");
 786         case 0xea: return ("FLUSHCACHE48");
 787         case 0xec: return ("ATA_IDENTIFY");
 788         case 0xef:
 789             switch (request->u.ata.feature) {
 790             case 0x03: return ("SETFEATURES SET TRANSFER MODE");
 791             case 0x02: return ("SETFEATURES ENABLE WCACHE");
 792             case 0x82: return ("SETFEATURES DISABLE WCACHE");
 793             case 0xaa: return ("SETFEATURES ENABLE RCACHE");
 794             case 0x55: return ("SETFEATURES DISABLE RCACHE");
 795             }
 796             ksprintf(buffer, "SETFEATURES 0x%02x", request->u.ata.feature);
 797             return buffer;
 798         case 0xf8: return ("READ_NATIVE_MAX_ADDRESS");
 799         }
 800     }
 801     ksprintf(buffer, "unknown CMD (0x%02x)", request->u.ata.command);
 802     return buffer;
 803 }
 804
 805 static char *
 806 ata_skey2str(u_int8_t skey)
 807 {
 808     switch (skey) {
 809     case 0x00: return ("NO SENSE");
 810     case 0x01: return ("RECOVERED ERROR");
 811     case 0x02: return ("NOT READY");
 812     case 0x03: return ("MEDIUM ERROR");
 813     case 0x04: return ("HARDWARE ERROR");
 814     case 0x05: return ("ILLEGAL REQUEST");
 815     case 0x06: return ("UNIT ATTENTION");
 816     case 0x07: return ("DATA PROTECT");
 817     case 0x08: return ("BLANK CHECK");
 818     case 0x09: return ("VENDOR SPECIFIC");
 819     case 0x0a: return ("COPY ABORTED");
 820     case 0x0b: return ("ABORTED COMMAND");
 821     case 0x0c: return ("EQUAL");
 822     case 0x0d: return ("VOLUME OVERFLOW");
 823     case 0x0e: return ("MISCOMPARE");
 824     case 0x0f: return ("RESERVED");
 825     default: return("UNKNOWN");
 826     }
 827 }