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 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_request *request = ata_alloc_request();
 162     int error = ENOMEM;
 163
 164     if (request) {
 165         request->dev = dev;
 166         request->u.ata.command = command;
 167         request->u.ata.lba = lba;
 168         request->u.ata.count = count;
 169         request->u.ata.feature = feature;
 170         request->flags = ATA_R_CONTROL;
 171         request->timeout = ATA_DEFAULT_TIMEOUT;
 172         request->retries = 0;
 173         ata_queue_request(request);
 174         error = request->result;
 175         ata_free_request(request);
 176     }
 177     return error;
 178 }
 179
 180 int
 181 ata_atapicmd(device_t dev, u_int8_t *ccb, caddr_t data,
 182              int count, int flags, int timeout)
 183 {
 184     struct ata_request *request = ata_alloc_request();
 185     struct ata_device *atadev = device_get_softc(dev);
 186     int error = ENOMEM;
 187
 188     if (request) {
 189         request->dev = dev;
 190         if ((atadev->param.config & ATA_PROTO_MASK) == ATA_PROTO_ATAPI_12)
 191             bcopy(ccb, request->u.atapi.ccb, 12);
 192         else
 193             bcopy(ccb, request->u.atapi.ccb, 16);
 194         request->data = data;
 195         request->bytecount = count;
 196         request->transfersize = min(request->bytecount, 65534);
 197         request->flags = flags | ATA_R_ATAPI;
 198         request->timeout = timeout;
 199         request->retries = 0;
 200         ata_queue_request(request);
 201         error = request->result;
 202         ata_free_request(request);
 203     }
 204     return error;
 205 }
 206
 207 void
 208 ata_start(device_t dev)
 209 {
 210     struct ata_channel *ch = device_get_softc(dev);
 211     struct ata_request *request;
 212     struct ata_composite *cptr;
 213     int dependencies = 0;
 214
 215     /* if we have a request on the queue try to get it running */
 216     lockmgr(&ch->queue_mtx, LK_EXCLUSIVE);
 217     if ((request = TAILQ_FIRST(&ch->ata_queue))) {
 218
 219         /* we need the locking function to get the lock for this channel */
 220         if (ATA_LOCKING(dev, ATA_LF_LOCK) == ch->unit) {
 221
 222             /* check for composite dependencies */
 223             if ((cptr = request->composite)) {
 224                 lockmgr(&cptr->lock, LK_EXCLUSIVE);
 225                 if ((request->flags & ATA_R_WRITE) &&
 226                     (cptr->wr_depend & cptr->rd_done) != cptr->wr_depend) {
 227                     dependencies = 1;
 228                 }
 229                 lockmgr(&cptr->lock, LK_RELEASE);
 230             }
 231
 232             /* check we are in the right state and has no dependencies */
 233             lockmgr(&ch->state_mtx, LK_EXCLUSIVE);
 234             if (ch->state == ATA_IDLE && !dependencies) {
 235                 ATA_DEBUG_RQ(request, "starting");
 236
 237                 if (ch->transition == request)
 238                     ch->transition = TAILQ_NEXT(request, chain);
 239                 TAILQ_REMOVE(&ch->ata_queue, request, chain);
 240                 ch->running = request;
 241                 ch->state = ATA_ACTIVE;
 242
 243                 if (ch->hw.begin_transaction(request) == ATA_OP_FINISHED) {
 244                     ch->running = NULL;
 245                     ch->state = ATA_IDLE;
 246                     lockmgr(&ch->state_mtx, LK_RELEASE);
 247                     lockmgr(&ch->queue_mtx, LK_RELEASE);
 248                     ATA_LOCKING(dev, ATA_LF_UNLOCK);
 249                     ata_finish(request);
 250                     return;
 251                 }
 252
 253                 /* interlock against interrupt */
 254                 request->flags |= ATA_R_HWCMDQUEUED;
 255
 256                 if (dumping) {
 257                     lockmgr(&ch->state_mtx, LK_RELEASE);
 258                     lockmgr(&ch->queue_mtx, LK_RELEASE);
 259                     while (!ata_interrupt(ch))
 260                         DELAY(10);
 261                     return;
 262                 }
 263             }
 264             lockmgr(&ch->state_mtx, LK_RELEASE);
 265         }
 266     }
 267     lockmgr(&ch->queue_mtx, LK_RELEASE);
 268 }
 269
 270 void
 271 ata_finish(struct ata_request *request)
 272 {
 273     struct ata_channel *ch = device_get_softc(request->parent);
 274
 275     /*
 276      * if in ATA_STALL_QUEUE state or request has ATA_R_DIRECT flags set
 277      * we need to call ata_complete() directly here (no taskqueue involvement)
 278      */
 279     if (dumping ||
 280         (ch->state & ATA_STALL_QUEUE) || (request->flags & ATA_R_DIRECT)) {
 281         ATA_DEBUG_RQ(request, "finish directly");
 282         ata_completed(request, 0);
 283     }
 284     else {
 285         /* put request on the proper taskqueue for completion */
 286         /* XXX FreeBSD has some sort of bio_taskqueue code here */
 287         TASK_INIT(&request->task, 0, ata_completed, request);
 288         ATA_DEBUG_RQ(request, "finish taskqueue_swi_mp");
 289         taskqueue_enqueue(taskqueue_swi_mp, &request->task);
 290     }
 291 }
 292
 293 static void
 294 ata_completed(void *context, int dummy)
 295 {
 296     struct ata_request *request = (struct ata_request *)context;
 297     struct ata_channel *ch = device_get_softc(request->parent);
 298     struct ata_device *atadev = device_get_softc(request->dev);
 299     struct ata_composite *composite;
 300
 301     if (request->flags & ATA_R_DANGER2) {
 302         device_printf(request->dev,
 303                       "WARNING - %s freeing taskqueue zombie request\n",
 304                       ata_cmd2str(request));
 305         request->flags &= ~(ATA_R_DANGER1 | ATA_R_DANGER2);
 306         ata_free_request(request);
 307         return;
 308     }
 309     if (request->flags & ATA_R_DANGER1)
 310         request->flags |= ATA_R_DANGER2;
 311
 312     ATA_DEBUG_RQ(request, "completed entered");
 313
 314     /* if we had a timeout, reinit channel and deal with the falldown */
 315     if (request->flags & ATA_R_TIMEOUT) {
 316         /*
 317          * if the channel is still present and
 318          * reinit succeeds and
 319          * the device doesn't get detached and
 320          * there are retries left we reinject this request
 321          */
 322         if (ch && !ata_reinit(ch->dev) && !request->result &&
 323             (request->retries-- > 0)) {
 324             if (!(request->flags & ATA_R_QUIET)) {
 325                 device_printf(request->dev,
 326                               "TIMEOUT - %s retrying (%d retr%s left)",
 327                               ata_cmd2str(request), request->retries,
 328                               request->retries == 1 ? "y" : "ies");
 329                 if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
 330                     kprintf(" LBA=%ju", request->u.ata.lba);
 331                 kprintf("\n");
 332             }
 333             request->flags &= ~(ATA_R_TIMEOUT | ATA_R_DEBUG);
 334             request->flags |= (ATA_R_AT_HEAD | ATA_R_REQUEUE);
 335             ATA_DEBUG_RQ(request, "completed reinject");
 336             ata_queue_request(request);
 337             return;
 338         }
 339
 340         /* ran out of good intentions so finish with error */
 341         if (!request->result) {
 342             if (!(request->flags & ATA_R_QUIET)) {
 343                 if (request->dev) {
 344                     device_printf(request->dev, "FAILURE - %s timed out",
 345                                   ata_cmd2str(request));
 346                     if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
 347                         kprintf(" LBA=%ju", request->u.ata.lba);
 348                     kprintf("\n");
 349                 }
 350             }
 351             request->result = EIO;
 352         }
 353     }
 354     else if (!(request->flags & ATA_R_ATAPI) ){
 355         /* if this is a soft ECC error warn about it */
 356         /* XXX SOS we could do WARF here */
 357         if ((request->status & (ATA_S_CORR | ATA_S_ERROR)) == ATA_S_CORR) {
 358             device_printf(request->dev,
 359                           "WARNING - %s soft error (ECC corrected)",
 360                           ata_cmd2str(request));
 361             if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
 362                 kprintf(" LBA=%ju", request->u.ata.lba);
 363             kprintf("\n");
 364         }
 365
 366         /* if this is a UDMA CRC error we reinject if there are retries left */
 367         if (request->flags & ATA_R_DMA && request->error & ATA_E_ICRC) {
 368             if (request->retries-- > 0) {
 369                 device_printf(request->dev,
 370                               "WARNING - %s UDMA ICRC error (retrying request)",
 371                               ata_cmd2str(request));
 372                 if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
 373                     kprintf(" LBA=%ju", request->u.ata.lba);
 374                 kprintf("\n");
 375                 request->flags |= (ATA_R_AT_HEAD | ATA_R_REQUEUE);
 376                 ata_queue_request(request);
 377                 return;
 378             }
 379         }
 380     }
 381
 382     switch (request->flags & ATA_R_ATAPI) {
 383
 384     /* ATA errors */
 385     default:
 386         if (!request->result && request->status & ATA_S_ERROR) {
 387             if (!(request->flags & ATA_R_QUIET)) {
 388                 device_printf(request->dev,
 389                               "FAILURE - %s status=%b error=%b",
 390                               ata_cmd2str(request),
 391                               request->status, "\20\10BUSY\7READY\6DMA_READY"
 392                               "\5DSC\4DRQ\3CORRECTABLE\2INDEX\1ERROR",
 393                               request->error, "\20\10ICRC\7UNCORRECTABLE"
 394                               "\6MEDIA_CHANGED\5NID_NOT_FOUND"
 395                               "\4MEDIA_CHANGE_REQEST"
 396                               "\3ABORTED\2NO_MEDIA\1ILLEGAL_LENGTH");
 397                 if ((request->flags & ATA_R_DMA) &&
 398                     (request->dmastat & ATA_BMSTAT_ERROR))
 399                     kprintf(" dma=0x%02x", request->dmastat);
 400                 if (!(request->flags & (ATA_R_ATAPI | ATA_R_CONTROL)))
 401                     kprintf(" LBA=%ju", request->u.ata.lba);
 402                 kprintf("\n");
 403             }
 404             request->result = EIO;
 405         }
 406         break;
 407
 408     /* ATAPI errors */
 409     case ATA_R_ATAPI:
 410         /* skip if result already set */
 411         if (request->result)
 412             break;
 413
 414         /* if we have a sensekey -> request sense from device */
 415         if ((request->error & ATA_E_ATAPI_SENSE_MASK) &&
 416             (request->u.atapi.ccb[0] != ATAPI_REQUEST_SENSE)) {
 417             static u_int8_t ccb[16] = { ATAPI_REQUEST_SENSE, 0, 0, 0,
 418                                         sizeof(struct atapi_sense),
 419                                         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };
 420
 421             request->u.atapi.saved_cmd = request->u.atapi.ccb[0];
 422             bcopy(ccb, request->u.atapi.ccb, 16);
 423             request->data = (caddr_t)&request->u.atapi.sense;
 424             request->bytecount = sizeof(struct atapi_sense);
 425             request->donecount = 0;
 426             request->transfersize = sizeof(struct atapi_sense);
 427             request->timeout = ATA_DEFAULT_TIMEOUT;
 428             request->flags &= (ATA_R_ATAPI | ATA_R_QUIET);
 429             request->flags |= (ATA_R_READ | ATA_R_AT_HEAD | ATA_R_REQUEUE);
 430             ATA_DEBUG_RQ(request, "autoissue request sense");
 431             ata_queue_request(request);
 432             return;
 433         }
 434
 435         switch (request->u.atapi.sense.key & ATA_SENSE_KEY_MASK) {
 436         case ATA_SENSE_RECOVERED_ERROR:
 437             device_printf(request->dev, "WARNING - %s recovered error\n",
 438                           ata_cmd2str(request));
 439             /* FALLTHROUGH */
 440
 441         case ATA_SENSE_NO_SENSE:
 442             request->result = 0;
 443             break;
 444
 445         case ATA_SENSE_NOT_READY:
 446             request->result = EBUSY;
 447             break;
 448
 449         case ATA_SENSE_UNIT_ATTENTION:
 450             atadev->flags |= ATA_D_MEDIA_CHANGED;
 451             request->result = EIO;
 452             break;
 453
 454         default:
 455             request->result = EIO;
 456             if (request->flags & ATA_R_QUIET)
 457                 break;
 458
 459             device_printf(request->dev,
 460                           "FAILURE - %s %s asc=0x%02x ascq=0x%02x ",
 461                           ata_cmd2str(request), ata_skey2str(
 462                           (request->u.atapi.sense.key & ATA_SENSE_KEY_MASK)),
 463                           request->u.atapi.sense.asc,
 464                           request->u.atapi.sense.ascq);
 465             if (request->u.atapi.sense.specific & ATA_SENSE_SPEC_VALID)
 466                 kprintf("sks=0x%02x 0x%02x 0x%02x\n",
 467                        request->u.atapi.sense.specific & ATA_SENSE_SPEC_MASK,
 468                        request->u.atapi.sense.specific1,
 469                        request->u.atapi.sense.specific2);
 470             else
 471                 kprintf("\n");
 472         }
 473
 474         if ((request->u.atapi.sense.key & ATA_SENSE_KEY_MASK ?
 475              request->u.atapi.sense.key & ATA_SENSE_KEY_MASK :
 476              request->error))
 477             request->result = EIO;
 478     }
 479
 480     ATA_DEBUG_RQ(request, "completed callback/wakeup");
 481
 482     /* if we are part of a composite operation we need to maintain progress */
 483     if ((composite = request->composite)) {
 484         int index = 0;
 485
 486         lockmgr(&composite->lock, LK_EXCLUSIVE);
 487
 488         /* update whats done */
 489         if (request->flags & ATA_R_READ)
 490             composite->rd_done |= (1 << request->this);
 491         if (request->flags & ATA_R_WRITE)
 492             composite->wr_done |= (1 << request->this);
 493
 494         /* find ready to go dependencies */
 495         if (composite->wr_depend &&
 496             (composite->rd_done & composite->wr_depend)==composite->wr_depend &&
 497             (composite->wr_needed & (~composite->wr_done))) {
 498             index = composite->wr_needed & ~composite->wr_done;
 499         }
 500
 501         lockmgr(&composite->lock, LK_RELEASE);
 502
 503         /* if we have any ready candidates kick them off */
 504         if (index) {
 505             int bit;
 506
 507             for (bit = 0; bit < MAX_COMPOSITES; bit++) {
 508                 if (index & (1 << bit))
 509                     ata_start(device_get_parent(composite->request[bit]->dev));
 510             }
 511         }
 512     }
 513
 514     /* get results back to the initiator for this request */
 515     if (request->callback)
 516         (request->callback)(request);
 517     else {
 518         lockmgr(&request->done, LK_EXCLUSIVE);
 519         request->flags |= ATA_R_COMPLETED;
 520         lockmgr(&request->done, LK_RELEASE);
 521         wakeup_one(request);
 522     }
 523
 524     /* only call ata_start if channel is present */
 525     if (ch)
 526         ata_start(ch->dev);
 527 }
 528
 529 void
 530 ata_timeout(struct ata_request *request)
 531 {
 532     struct ata_channel *ch = device_get_softc(request->parent);
 533
 534     /*
 535      * NOTE: callout acquired ch->state_mtx for us.
 536      */
 537     /*request->flags |= ATA_R_DEBUG;*/
 538     ATA_DEBUG_RQ(request, "timeout");
 539
 540     /*
 541      * if we have an ATA_ACTIVE request running, we flag the request
 542      * ATA_R_TIMEOUT so ata_finish will handle it correctly
 543      * also NULL out the running request so we wont loose
 544      * the race with an eventual interrupt arriving late
 545      */
 546     if (ch->state == ATA_ACTIVE) {
 547         request->flags |= ATA_R_TIMEOUT;
 548         lockmgr(&ch->state_mtx, LK_RELEASE);
 549         ATA_LOCKING(ch->dev, ATA_LF_UNLOCK);
 550         ata_finish(request);
 551         lockmgr(&ch->state_mtx, LK_EXCLUSIVE);
 552     }
 553 }
 554
 555 void
 556 ata_fail_requests(device_t dev)
 557 {
 558     struct ata_channel *ch = device_get_softc(device_get_parent(dev));
 559     struct ata_request *request, *tmp;
 560     TAILQ_HEAD(, ata_request) fail_requests;
 561     TAILQ_INIT(&fail_requests);
 562
 563     /* grap all channel locks to avoid races */
 564     lockmgr(&ch->queue_mtx, LK_EXCLUSIVE);
 565     lockmgr(&ch->state_mtx, LK_EXCLUSIVE);
 566
 567     /* do we have any running request to care about ? */
 568     if ((request = ch->running) && (!dev || request->dev == dev)) {
 569         callout_stop_sync(&request->callout);
 570         ch->running = NULL;
 571         request->result = ENXIO;
 572         TAILQ_INSERT_TAIL(&fail_requests, request, chain);
 573     }
 574
 575     /* fail all requests queued on this channel for device dev if !NULL */
 576     TAILQ_FOREACH_MUTABLE(request, &ch->ata_queue, chain, tmp) {
 577         if (!dev || request->dev == dev) {
 578             if (ch->transition == request)
 579                 ch->transition = TAILQ_NEXT(request, chain);
 580             TAILQ_REMOVE(&ch->ata_queue, request, chain);
 581             request->result = ENXIO;
 582             TAILQ_INSERT_TAIL(&fail_requests, request, chain);
 583         }
 584     }
 585
 586     lockmgr(&ch->state_mtx, LK_RELEASE);
 587     lockmgr(&ch->queue_mtx, LK_RELEASE);
 588
 589     /* finish up all requests collected above */
 590     TAILQ_FOREACH_MUTABLE(request, &fail_requests, chain, tmp) {
 591         TAILQ_REMOVE(&fail_requests, request, chain);
 592         ata_finish(request);
 593     }
 594 }
 595
 596 static u_int64_t
 597 ata_get_lba(struct ata_request *request)
 598 {
 599     if (request->flags & ATA_R_ATAPI) {
 600         switch (request->u.atapi.ccb[0]) {
 601         case ATAPI_READ_BIG:
 602         case ATAPI_WRITE_BIG:
 603         case ATAPI_READ_CD:
 604             return (request->u.atapi.ccb[5]) | (request->u.atapi.ccb[4]<<8) |
 605                    (request->u.atapi.ccb[3]<<16)|(request->u.atapi.ccb[2]<<24);
 606         case ATAPI_READ:
 607         case ATAPI_WRITE:
 608             return (request->u.atapi.ccb[4]) | (request->u.atapi.ccb[3]<<8) |
 609                    (request->u.atapi.ccb[2]<<16);
 610         default:
 611             return 0;
 612         }
 613     }
 614     else
 615         return request->u.ata.lba;
 616 }
 617
 618 /*
 619  * This implements exactly bioqdisksort() in the DragonFly kernel.
 620  * The short description is: Because megabytes and megabytes worth of
 621  * writes can be queued there needs to be a read-prioritization mechanism
 622  * or reads get completely starved out.
 623  */
 624 static void
 625 ata_sort_queue(struct ata_channel *ch, struct ata_request *request)
 626 {
 627     if ((request->flags & ATA_R_WRITE) == 0) {
 628         if (ch->transition) {
 629             /*
 630              * Insert before the first write
 631              */
 632             TAILQ_INSERT_BEFORE(ch->transition, request, chain);
 633             if (++ch->reorder >= bioq_reorder_minor_interval) {
 634                 ch->reorder = 0;
 635                 atawritereorder(ch);
 636             }
 637         } else {
 638             /*
 639              * No writes queued (or ordering was forced),
 640              * insert at tail.
 641              */
 642             TAILQ_INSERT_TAIL(&ch->ata_queue, request, chain);
 643         }
 644     } else {
 645         /*
 646          * Writes are always appended.  If no writes were previously
 647          * queued or an ordered tail insertion occured the transition
 648          * field will be NULL.
 649          */
 650         TAILQ_INSERT_TAIL(&ch->ata_queue, request, chain);
 651         if (ch->transition == NULL)
 652                 ch->transition = request;
 653     }
 654     if (request->composite) {
 655         ch->transition = NULL;
 656         ch->reorder = 0;
 657     }
 658 }
 659
 660 /*
 661  * Move the transition point to prevent reads from completely
 662  * starving our writes.  This brings a number of writes into
 663  * the fold every N reads.
 664  */
 665 static void
 666 atawritereorder(struct ata_channel *ch)
 667 {
 668     struct ata_request *req;
 669     u_int64_t next_offset;
 670     size_t left = (size_t)bioq_reorder_minor_bytes;
 671     size_t n;
 672
 673     next_offset = ata_get_lba(ch->transition);
 674     while ((req = ch->transition) != NULL &&
 675            next_offset == ata_get_lba(req)) {
 676         n = req->u.ata.count;
 677         next_offset = ata_get_lba(req);
 678         ch->transition = TAILQ_NEXT(req, chain);
 679         if (left < n)
 680             break;
 681         left -= n;
 682     }
 683 }
 684
 685 char *
 686 ata_cmd2str(struct ata_request *request)
 687 {
 688     static char buffer[20];
 689
 690     if (request->flags & ATA_R_ATAPI) {
 691         switch (request->u.atapi.sense.key ?
 692                 request->u.atapi.saved_cmd : request->u.atapi.ccb[0]) {
 693         case 0x00: return ("TEST_UNIT_READY");
 694         case 0x01: return ("REZERO");
 695         case 0x03: return ("REQUEST_SENSE");
 696         case 0x04: return ("FORMAT");
 697         case 0x08: return ("READ");
 698         case 0x0a: return ("WRITE");
 699         case 0x10: return ("WEOF");
 700         case 0x11: return ("SPACE");
 701         case 0x12: return ("INQUIRY");
 702         case 0x15: return ("MODE_SELECT");
 703         case 0x19: return ("ERASE");
 704         case 0x1a: return ("MODE_SENSE");
 705         case 0x1b: return ("START_STOP");
 706         case 0x1e: return ("PREVENT_ALLOW");
 707         case 0x23: return ("ATAPI_READ_FORMAT_CAPACITIES");
 708         case 0x25: return ("READ_CAPACITY");
 709         case 0x28: return ("READ_BIG");
 710         case 0x2a: return ("WRITE_BIG");
 711         case 0x2b: return ("LOCATE");
 712         case 0x34: return ("READ_POSITION");
 713         case 0x35: return ("SYNCHRONIZE_CACHE");
 714         case 0x3b: return ("WRITE_BUFFER");
 715         case 0x3c: return ("READ_BUFFER");
 716         case 0x42: return ("READ_SUBCHANNEL");
 717         case 0x43: return ("READ_TOC");
 718         case 0x45: return ("PLAY_10");
 719         case 0x47: return ("PLAY_MSF");
 720         case 0x48: return ("PLAY_TRACK");
 721         case 0x4b: return ("PAUSE");
 722         case 0x51: return ("READ_DISK_INFO");
 723         case 0x52: return ("READ_TRACK_INFO");
 724         case 0x53: return ("RESERVE_TRACK");
 725         case 0x54: return ("SEND_OPC_INFO");
 726         case 0x55: return ("MODE_SELECT_BIG");
 727         case 0x58: return ("REPAIR_TRACK");
 728         case 0x59: return ("READ_MASTER_CUE");
 729         case 0x5a: return ("MODE_SENSE_BIG");
 730         case 0x5b: return ("CLOSE_TRACK/SESSION");
 731         case 0x5c: return ("READ_BUFFER_CAPACITY");
 732         case 0x5d: return ("SEND_CUE_SHEET");
 733         case 0x96: return ("READ_CAPACITY_16");
 734         case 0xa1: return ("BLANK_CMD");
 735         case 0xa3: return ("SEND_KEY");
 736         case 0xa4: return ("REPORT_KEY");
 737         case 0xa5: return ("PLAY_12");
 738         case 0xa6: return ("LOAD_UNLOAD");
 739         case 0xad: return ("READ_DVD_STRUCTURE");
 740         case 0xb4: return ("PLAY_CD");
 741         case 0xbb: return ("SET_SPEED");
 742         case 0xbd: return ("MECH_STATUS");
 743         case 0xbe: return ("READ_CD");
 744         case 0xff: return ("POLL_DSC");
 745         }
 746     }
 747     else {
 748         switch (request->u.ata.command) {
 749         case 0x00: return ("NOP");
 750         case 0x08: return ("DEVICE_RESET");
 751         case 0x20: return ("READ");
 752         case 0x24: return ("READ48");
 753         case 0x25: return ("READ_DMA48");
 754         case 0x26: return ("READ_DMA_QUEUED48");
 755         case 0x29: return ("READ_MUL48");
 756         case 0x30: return ("WRITE");
 757         case 0x34: return ("WRITE48");
 758         case 0x35: return ("WRITE_DMA48");
 759         case 0x36: return ("WRITE_DMA_QUEUED48");
 760         case 0x39: return ("WRITE_MUL48");
 761         case 0x70: return ("SEEK");
 762         case 0xa0: return ("PACKET_CMD");
 763         case 0xa1: return ("ATAPI_IDENTIFY");
 764         case 0xa2: return ("SERVICE");
 765         case 0xb0: return ("SMART");
 766         case 0xc0: return ("CFA ERASE");
 767         case 0xc4: return ("READ_MUL");
 768         case 0xc5: return ("WRITE_MUL");
 769         case 0xc6: return ("SET_MULTI");
 770         case 0xc7: return ("READ_DMA_QUEUED");
 771         case 0xc8: return ("READ_DMA");
 772         case 0xca: return ("WRITE_DMA");
 773         case 0xcc: return ("WRITE_DMA_QUEUED");
 774         case 0xe6: return ("SLEEP");
 775         case 0xe7: return ("FLUSHCACHE");
 776         case 0xea: return ("FLUSHCACHE48");
 777         case 0xec: return ("ATA_IDENTIFY");
 778         case 0xef:
 779             switch (request->u.ata.feature) {
 780             case 0x03: return ("SETFEATURES SET TRANSFER MODE");
 781             case 0x02: return ("SETFEATURES ENABLE WCACHE");
 782             case 0x82: return ("SETFEATURES DISABLE WCACHE");
 783             case 0xaa: return ("SETFEATURES ENABLE RCACHE");
 784             case 0x55: return ("SETFEATURES DISABLE RCACHE");
 785             }
 786             ksprintf(buffer, "SETFEATURES 0x%02x", request->u.ata.feature);
 787             return buffer;
 788         }
 789     }
 790     ksprintf(buffer, "unknown CMD (0x%02x)", request->u.ata.command);
 791     return buffer;
 792 }
 793
 794 static char *
 795 ata_skey2str(u_int8_t skey)
 796 {
 797     switch (skey) {
 798     case 0x00: return ("NO SENSE");
 799     case 0x01: return ("RECOVERED ERROR");
 800     case 0x02: return ("NOT READY");
 801     case 0x03: return ("MEDIUM ERROR");
 802     case 0x04: return ("HARDWARE ERROR");
 803     case 0x05: return ("ILLEGAL REQUEST");
 804     case 0x06: return ("UNIT ATTENTION");
 805     case 0x07: return ("DATA PROTECT");
 806     case 0x08: return ("BLANK CHECK");
 807     case 0x09: return ("VENDOR SPECIFIC");
 808     case 0x0a: return ("COPY ABORTED");
 809     case 0x0b: return ("ABORTED COMMAND");
 810     case 0x0c: return ("EQUAL");
 811     case 0x0d: return ("VOLUME OVERFLOW");
 812     case 0x0e: return ("MISCOMPARE");
 813     case 0x0f: return ("RESERVED");
 814     default: return("UNKNOWN");
 815     }
 816 }