sys/dev/ata/atapi-cam.c

   1 /*-
   2  * Copyright (c) 2001-2007 Thomas Quinot <thomas@cuivre.fr.eu.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  * 3. The name of the author may not be used to endorse or promote products
  15  *    derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/bus.h>
  35 #include <sys/kernel.h>
  36 #include <sys/malloc.h>
  37 #include <sys/ata.h>
  38 #include <sys/taskqueue.h>
  39 #include <sys/lock.h>
  40 #include <sys/mutex.h>
  41 #include <sys/sema.h>
  42 #include <vm/uma.h>
  43 #include <machine/resource.h>
  44 #include <machine/bus.h>
  45
  46 #include <cam/cam.h>
  47 #include <cam/cam_ccb.h>
  48 #include <cam/cam_periph.h>
  49 #include <cam/cam_sim.h>
  50 #include <cam/cam_xpt_sim.h>
  51 #include <cam/cam_xpt_periph.h>
  52 #include <cam/cam_debug.h>
  53 #include <cam/scsi/scsi_all.h>
  54
  55 #include <dev/ata/ata-all.h>
  56 #include <ata_if.h>
  57
  58 /* private data associated with an ATA bus */
  59 struct atapi_xpt_softc {
  60     struct ata_device   atapi_cam_dev;  /* must be first */
  61     device_t            dev;
  62     device_t            parent;
  63     struct ata_channel  *ata_ch;
  64     struct cam_path     *path;
  65     struct cam_sim      *sim;
  66     int                 flags;
  67 #define BUS_REGISTERED          0x01
  68 #define RESOURCE_SHORTAGE       0x02
  69 #define DETACHING               0x04
  70
  71     TAILQ_HEAD(,atapi_hcb) pending_hcbs;
  72     struct ata_device   *atadev[2];
  73     struct mtx          state_lock;
  74 };
  75
  76 /* hardware command descriptor block */
  77 struct atapi_hcb {
  78     struct atapi_xpt_softc *softc;
  79     int                 unit;
  80     int                 bus;
  81     int                 target;
  82     int                 lun;
  83     union ccb           *ccb;
  84     int                 flags;
  85 #define QUEUED          0x0001
  86 #define AUTOSENSE       0x0002
  87     char                *dxfer_alloc;
  88     TAILQ_ENTRY(atapi_hcb) chain;
  89 };
  90
  91 enum reinit_reason { BOOT_ATTACH, ATTACH, RESET };
  92
  93 /* Device methods */
  94 static void atapi_cam_identify(device_t *dev, device_t parent);
  95 static int atapi_cam_probe(device_t dev);
  96 static int atapi_cam_attach(device_t dev);
  97 static int atapi_cam_detach(device_t dev);
  98 static int atapi_cam_reinit(device_t dev);
  99
 100 /* CAM XPT methods */
 101 static void atapi_action(struct cam_sim *, union ccb *);
 102 static void atapi_poll(struct cam_sim *);
 103 static void atapi_async(void *, u_int32_t, struct cam_path *, void *);
 104 static void atapi_cb(struct ata_request *);
 105
 106 /* Module methods */
 107 static int atapi_cam_event_handler(module_t mod, int what, void *arg);
 108
 109 /* internal functions */
 110 static void reinit_bus(struct atapi_xpt_softc *scp, enum reinit_reason reason);
 111 static void setup_async_cb(struct atapi_xpt_softc *, uint32_t);
 112 static void cam_rescan_callback(struct cam_periph *, union ccb *);
 113 static void cam_rescan(struct cam_sim *);
 114 static void free_hcb_and_ccb_done(struct atapi_hcb *, u_int32_t);
 115 static struct atapi_hcb *allocate_hcb(struct atapi_xpt_softc *, int, int, union ccb *);
 116 static void free_hcb(struct atapi_hcb *hcb);
 117 static void free_softc(struct atapi_xpt_softc *scp);
 118
 119 static MALLOC_DEFINE(M_ATACAM, "ata_cam", "ATA driver CAM-XPT layer");
 120
 121 static device_method_t atapi_cam_methods[] = {
 122         DEVMETHOD(device_identify,      atapi_cam_identify),
 123         DEVMETHOD(device_probe,         atapi_cam_probe),
 124         DEVMETHOD(device_attach,        atapi_cam_attach),
 125         DEVMETHOD(device_detach,        atapi_cam_detach),
 126         DEVMETHOD(ata_reinit,           atapi_cam_reinit),
 127         {0, 0}
 128 };
 129
 130 static driver_t atapi_cam_driver = {
 131         "atapicam",
 132         atapi_cam_methods,
 133         sizeof(struct atapi_xpt_softc)
 134 };
 135
 136 static devclass_t       atapi_cam_devclass;
 137 DRIVER_MODULE(atapicam, ata,
 138         atapi_cam_driver,
 139         atapi_cam_devclass,
 140         atapi_cam_event_handler,
 141         /*arg*/NULL);
 142 MODULE_VERSION(atapicam, 1);
 143 MODULE_DEPEND(atapicam, ata, 1, 1, 1);
 144 MODULE_DEPEND(atapicam, cam, 1, 1, 1);
 145
 146 static void
 147 atapi_cam_identify(device_t *dev, device_t parent)
 148 {
 149         struct atapi_xpt_softc *scp =
 150             malloc (sizeof (struct atapi_xpt_softc), M_ATACAM, M_NOWAIT|M_ZERO);
 151         device_t child;
 152
 153         if (scp == NULL) {
 154                 printf ("atapi_cam_identify: out of memory");
 155                 return;
 156         }
 157
 158         /* Assume one atapicam instance per parent channel instance. */
 159         child = device_add_child(parent, "atapicam", -1);
 160         if (child == NULL) {
 161                 printf ("atapi_cam_identify: out of memory, can't add child");
 162                 free (scp, M_ATACAM);
 163                 return;
 164         }
 165         scp->atapi_cam_dev.unit = -1;
 166         scp->atapi_cam_dev.dev  = child;
 167         device_quiet(child);
 168         device_set_softc(child, scp);
 169 }
 170
 171 static int
 172 atapi_cam_probe(device_t dev)
 173 {
 174         struct ata_device *atadev = device_get_softc (dev);
 175
 176         KASSERT(atadev != NULL, ("expect valid struct ata_device"));
 177         if (atadev->unit < 0) {
 178                 device_set_desc(dev, "ATAPI CAM Attachment");
 179                 return (0);
 180         } else {
 181                 return ENXIO;
 182         }
 183 }
 184
 185 static int
 186 atapi_cam_attach(device_t dev)
 187 {
 188     struct atapi_xpt_softc *scp = NULL;
 189     struct cam_devq *devq = NULL;
 190     struct cam_sim *sim = NULL;
 191     struct cam_path *path = NULL;
 192     int unit, error;
 193
 194     scp = (struct atapi_xpt_softc *)device_get_softc(dev);
 195     if (scp == NULL) {
 196         device_printf(dev, "Cannot get softc\n");
 197         return (ENOMEM);
 198     }
 199
 200     mtx_init(&scp->state_lock, "ATAPICAM lock", NULL, MTX_DEF);
 201
 202     scp->dev = dev;
 203     scp->parent = device_get_parent(dev);
 204     scp->ata_ch = device_get_softc(scp->parent);
 205     TAILQ_INIT(&scp->pending_hcbs);
 206     unit = device_get_unit(dev);
 207
 208     if ((devq = cam_simq_alloc(16)) == NULL) {
 209         error = ENOMEM;
 210         goto out;
 211     }
 212
 213     if ((sim = cam_sim_alloc(atapi_action, atapi_poll, "ata",
 214                  (void *)scp, unit, &scp->state_lock, 1, 1, devq)) == NULL) {
 215         error = ENOMEM;
 216         goto out;
 217     }
 218     scp->sim = sim;
 219
 220     mtx_lock(&scp->state_lock);
 221     if (xpt_bus_register(sim, dev, 0) != CAM_SUCCESS) {
 222         error = EINVAL;
 223         mtx_unlock(&scp->state_lock);
 224         goto out;
 225     }
 226     scp->flags |= BUS_REGISTERED;
 227
 228     if (xpt_create_path(&path, /*periph*/ NULL,
 229                 cam_sim_path(sim), CAM_TARGET_WILDCARD,
 230                 CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
 231         error = ENOMEM;
 232         mtx_unlock(&scp->state_lock);
 233         goto out;
 234     }
 235     scp->path = path;
 236
 237     CAM_DEBUG(path, CAM_DEBUG_TRACE, ("Registered SIM for ata%d\n", unit));
 238
 239     setup_async_cb(scp, AC_LOST_DEVICE);
 240     reinit_bus(scp, cold ? BOOT_ATTACH : ATTACH);
 241     error = 0;
 242     mtx_unlock(&scp->state_lock);
 243
 244 out:
 245     if (error != 0)
 246         free_softc(scp);
 247
 248     return (error);
 249 }
 250
 251 static int
 252 atapi_cam_detach(device_t dev)
 253 {
 254     struct atapi_xpt_softc *scp = device_get_softc(dev);
 255
 256     mtx_lock(&scp->state_lock);
 257     xpt_freeze_simq(scp->sim, 1 /*count*/);
 258     scp->flags |= DETACHING;
 259     mtx_unlock(&scp->state_lock);
 260     free_softc(scp);
 261     return (0);
 262 }
 263
 264 static int
 265 atapi_cam_reinit(device_t dev) {
 266     struct atapi_xpt_softc *scp = device_get_softc(dev);
 267
 268     /*
 269      * scp might be null if the bus is being reinitialised during
 270      * the boot-up sequence, before the ATAPI bus is registered.
 271      */
 272
 273     if (scp != NULL) {
 274         mtx_lock(&scp->state_lock);
 275         reinit_bus(scp, RESET);
 276         mtx_unlock(&scp->state_lock);
 277     }
 278     return (0);
 279 }
 280
 281 static void
 282 reinit_bus(struct atapi_xpt_softc *scp, enum reinit_reason reason) {
 283     struct ata_device *old_atadev[2], *atadev;
 284     device_t *children;
 285     int nchildren, i, dev_changed;
 286
 287     if (device_get_children(scp->parent, &children, &nchildren) != 0) {
 288         return;
 289     }
 290
 291     old_atadev[0] = scp->atadev[0];
 292     old_atadev[1] = scp->atadev[1];
 293     scp->atadev[0] = NULL;
 294     scp->atadev[1] = NULL;
 295
 296     for (i = 0; i < nchildren; i++) {
 297         /* XXX Does the child need to actually be attached yet? */
 298         if (children[i] != NULL) {
 299             atadev = device_get_softc(children[i]);
 300             if ((atadev->unit == ATA_MASTER) &&
 301                 (scp->ata_ch->devices & ATA_ATAPI_MASTER) != 0)
 302                 scp->atadev[0] = atadev;
 303             if ((atadev->unit == ATA_SLAVE) &&
 304                 (scp->ata_ch->devices & ATA_ATAPI_SLAVE) != 0)
 305                 scp->atadev[1] = atadev;
 306         }
 307     }
 308     dev_changed = (old_atadev[0] != scp->atadev[0])
 309                || (old_atadev[1] != scp->atadev[1]);
 310     free(children, M_TEMP);
 311
 312     switch (reason) {
 313         case BOOT_ATTACH:
 314             break;
 315         case RESET:
 316             xpt_async(AC_BUS_RESET, scp->path, NULL);
 317
 318             if (!dev_changed)
 319                 break;
 320
 321             /*FALLTHROUGH*/
 322         case ATTACH:
 323             cam_rescan(scp->sim);
 324             break;
 325     }
 326 }
 327
 328 static void
 329 setup_async_cb(struct atapi_xpt_softc *scp, uint32_t events)
 330 {
 331     struct ccb_setasync csa;
 332
 333     xpt_setup_ccb(&csa.ccb_h, scp->path, /*priority*/ 5);
 334     csa.ccb_h.func_code = XPT_SASYNC_CB;
 335     csa.event_enable = events;
 336     csa.callback = &atapi_async;
 337     csa.callback_arg = scp->sim;
 338     xpt_action((union ccb *) &csa);
 339 }
 340
 341 static void
 342 atapi_action(struct cam_sim *sim, union ccb *ccb)
 343 {
 344     struct atapi_xpt_softc *softc = (struct atapi_xpt_softc*)cam_sim_softc(sim);
 345     struct ccb_hdr *ccb_h = &ccb->ccb_h;
 346     struct atapi_hcb *hcb = NULL;
 347     struct ata_request *request = NULL;
 348     int unit = cam_sim_unit(sim);
 349     int bus = cam_sim_bus(sim);
 350     int len;
 351     char *buf;
 352
 353     switch (ccb_h->func_code) {
 354     case XPT_PATH_INQ: {
 355         struct ccb_pathinq *cpi = &ccb->cpi;
 356         int tid = ccb_h->target_id;
 357
 358         cpi->version_num = 1;
 359         cpi->hba_inquiry = 0;
 360         cpi->target_sprt = 0;
 361         cpi->hba_misc = PIM_NO_6_BYTE;
 362         cpi->hba_eng_cnt = 0;
 363         bzero(cpi->vuhba_flags, sizeof(cpi->vuhba_flags));
 364         cpi->max_target = 1;
 365         cpi->max_lun = 0;
 366         cpi->async_flags = 0;
 367         cpi->hpath_id = 0;
 368         cpi->initiator_id = 7;
 369         strncpy(cpi->sim_vid, "FreeBSD", sizeof(cpi->sim_vid));
 370         strncpy(cpi->hba_vid, "ATAPI", sizeof(cpi->hba_vid));
 371         strncpy(cpi->dev_name, cam_sim_name(sim), sizeof cpi->dev_name);
 372         cpi->unit_number = cam_sim_unit(sim);
 373         cpi->bus_id = cam_sim_bus(sim);
 374         cpi->base_transfer_speed = 3300;
 375         cpi->transport = XPORT_ATA;
 376         cpi->transport_version = 2;
 377         cpi->protocol = PROTO_SCSI;
 378         cpi->protocol_version = SCSI_REV_2;
 379
 380         if (softc->ata_ch && tid != CAM_TARGET_WILDCARD) {
 381             if (softc->atadev[tid] == NULL) {
 382                 ccb->ccb_h.status = CAM_DEV_NOT_THERE;
 383                 xpt_done(ccb);
 384                 return;
 385             }
 386             switch (softc->atadev[ccb_h->target_id]->mode) {
 387             case ATA_PIO1:
 388                 cpi->base_transfer_speed = 5200;
 389                 break;
 390             case ATA_PIO2:
 391                 cpi->base_transfer_speed = 7000;
 392                 break;
 393             case ATA_PIO3:
 394                 cpi->base_transfer_speed = 11000;
 395                 break;
 396             case ATA_PIO4:
 397             case ATA_DMA:
 398             case ATA_WDMA2:
 399                 cpi->base_transfer_speed = 16000;
 400                 break;
 401             case ATA_UDMA2:
 402                 cpi->base_transfer_speed = 33000;
 403                 break;
 404             case ATA_UDMA4:
 405                 cpi->base_transfer_speed = 66000;
 406                 break;
 407             case ATA_UDMA5:
 408                 cpi->base_transfer_speed = 100000;
 409                 break;
 410             case ATA_UDMA6:
 411                 cpi->base_transfer_speed = 133000;
 412                 break;
 413             default:
 414                 break;
 415             }
 416         }
 417         ccb->ccb_h.status = CAM_REQ_CMP;
 418         xpt_done(ccb);
 419         return;
 420     }
 421
 422     case XPT_RESET_DEV: {
 423         int tid = ccb_h->target_id;
 424
 425         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("dev reset\n"));
 426         mtx_unlock(&softc->state_lock);
 427         ata_controlcmd(softc->atadev[tid]->dev, ATA_DEVICE_RESET, 0, 0, 0);
 428         mtx_lock(&softc->state_lock);
 429         ccb->ccb_h.status = CAM_REQ_CMP;
 430         xpt_done(ccb);
 431         return;
 432     }
 433
 434     case XPT_RESET_BUS:
 435         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("bus reset\n"));
 436         mtx_unlock(&softc->state_lock);
 437         ata_reinit(softc->parent);
 438         mtx_lock(&softc->state_lock);
 439         ccb->ccb_h.status = CAM_REQ_CMP;
 440         xpt_done(ccb);
 441         return;
 442
 443     case XPT_SET_TRAN_SETTINGS:
 444         /* ignore these, we're not doing SCSI here */
 445         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE,
 446                   ("SET_TRAN_SETTINGS not supported\n"));
 447         ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
 448         xpt_done(ccb);
 449         return;
 450
 451     case XPT_GET_TRAN_SETTINGS: {
 452         struct ccb_trans_settings *cts = &ccb->cts;
 453         cts->protocol = PROTO_SCSI;
 454         cts->protocol_version = SCSI_REV_2;
 455         cts->transport = XPORT_ATA;
 456         cts->transport_version = XPORT_VERSION_UNSPECIFIED;
 457         cts->proto_specific.valid = 0;
 458         cts->xport_specific.valid = 0;
 459         /* nothing more to do */
 460         ccb->ccb_h.status = CAM_REQ_CMP;
 461         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("GET_TRAN_SETTINGS\n"));
 462         xpt_done(ccb);
 463         return;
 464     }
 465
 466     case XPT_CALC_GEOMETRY: {
 467         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("CALC_GEOMETRY\n"));
 468         cam_calc_geometry(&ccb->ccg, /*extended*/1);
 469         xpt_done(ccb);
 470         return;
 471     }
 472
 473     case XPT_SCSI_IO: {
 474         struct ccb_scsiio *csio = &ccb->csio;
 475         int tid = ccb_h->target_id, lid = ccb_h->target_lun;
 476         int request_flags = ATA_R_ATAPI;
 477
 478         CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE, ("XPT_SCSI_IO\n"));
 479
 480         if (softc->flags & DETACHING) {
 481             ccb->ccb_h.status = CAM_REQ_ABORTED;
 482             xpt_done(ccb);
 483             return;
 484         }
 485
 486         if (softc->atadev[tid] == NULL) {
 487             ccb->ccb_h.status = CAM_DEV_NOT_THERE;
 488             xpt_done(ccb);
 489             return;
 490         }
 491
 492         /* check that this request was not aborted already */
 493         if ((ccb_h->status & CAM_STATUS_MASK) != CAM_REQ_INPROG) {
 494             printf("XPT_SCSI_IO received but already in progress?\n");
 495             xpt_done(ccb);
 496             return;
 497         }
 498         if (lid > 0) {
 499             CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
 500                       ("SCSI IO received for invalid lun %d\n", lid));
 501             goto action_invalid;
 502         }
 503         if (csio->cdb_len > sizeof request->u.atapi.ccb) {
 504             CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
 505                 ("CAM CCB too long for ATAPI"));
 506             goto action_invalid;
 507         }
 508         if ((ccb_h->flags & CAM_SCATTER_VALID)) {
 509             /* scatter-gather not supported */
 510             xpt_print_path(ccb_h->path);
 511             printf("ATAPI/CAM does not support scatter-gather yet!\n");
 512             goto action_invalid;
 513         }
 514
 515         switch (ccb_h->flags & CAM_DIR_MASK) {
 516         case CAM_DIR_IN:
 517              request_flags |= ATA_R_READ;
 518              break;
 519         case CAM_DIR_OUT:
 520              request_flags |= ATA_R_WRITE;
 521              break;
 522         case CAM_DIR_NONE:
 523              /* No flags need to be set */
 524              break;
 525         default:
 526              device_printf(softc->dev, "unknown IO operation\n");
 527              goto action_invalid;
 528         }
 529
 530         if ((hcb = allocate_hcb(softc, unit, bus, ccb)) == NULL) {
 531             printf("cannot allocate ATAPI/CAM hcb\n");
 532             goto action_oom;
 533         }
 534         if ((request = ata_alloc_request()) == NULL) {
 535             printf("cannot allocate ATAPI/CAM request\n");
 536             goto action_oom;
 537         }
 538
 539         bcopy((ccb_h->flags & CAM_CDB_POINTER) ?
 540               csio->cdb_io.cdb_ptr : csio->cdb_io.cdb_bytes,
 541               request->u.atapi.ccb, csio->cdb_len);
 542 #ifdef CAMDEBUG
 543         if (CAM_DEBUGGED(ccb_h->path, CAM_DEBUG_CDB)) {
 544                 char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
 545
 546                 printf("atapi_action: hcb@%p: %s\n", hcb,
 547                        scsi_cdb_string(request->u.atapi.ccb, cdb_str, sizeof(cdb_str)));
 548         }
 549         if (CAM_DEBUGGED(ccb_h->path, CAM_DEBUG_SUBTRACE)) {
 550                 request_flags |= ATA_R_DEBUG;
 551         }
 552 #endif
 553
 554         len = csio->dxfer_len;
 555         buf = csio->data_ptr;
 556
 557         /* some SCSI commands require special processing */
 558         switch (request->u.atapi.ccb[0]) {
 559         case INQUIRY: {
 560             /*
 561              * many ATAPI devices seem to report more than
 562              * SHORT_INQUIRY_LENGTH bytes of available INQUIRY
 563              * information, but respond with some incorrect condition
 564              * when actually asked for it, so we are going to pretend
 565              * that only SHORT_INQUIRY_LENGTH are expected, anyway.
 566              */
 567             struct scsi_inquiry *inq = (struct scsi_inquiry *) &request->u.atapi.ccb[0];
 568
 569             if (inq->byte2 == 0 && inq->page_code == 0 &&
 570                 inq->length > SHORT_INQUIRY_LENGTH) {
 571                 bzero(buf, len);
 572                 len = inq->length = SHORT_INQUIRY_LENGTH;
 573             }
 574             break;
 575         }
 576         case READ_6:
 577             /* FALLTHROUGH */
 578
 579         case WRITE_6:
 580             CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
 581                       ("Translating %s into _10 equivalent\n",
 582                       (request->u.atapi.ccb[0] == READ_6) ? "READ_6" : "WRITE_6"));
 583             request->u.atapi.ccb[0] |= 0x20;
 584             request->u.atapi.ccb[9] = request->u.atapi.ccb[5];
 585             request->u.atapi.ccb[8] = request->u.atapi.ccb[4];
 586             request->u.atapi.ccb[7] = 0;
 587             request->u.atapi.ccb[6] = 0;
 588             request->u.atapi.ccb[5] = request->u.atapi.ccb[3];
 589             request->u.atapi.ccb[4] = request->u.atapi.ccb[2];
 590             request->u.atapi.ccb[3] = request->u.atapi.ccb[1] & 0x1f;
 591             request->u.atapi.ccb[2] = 0;
 592             request->u.atapi.ccb[1] = 0;
 593             /* FALLTHROUGH */
 594
 595         case READ_10:
 596             /* FALLTHROUGH */
 597         case WRITE_10:
 598             /* FALLTHROUGH */
 599         case READ_12:
 600             /* FALLTHROUGH */
 601         case WRITE_12:
 602             /*
 603              * Enable DMA (if target supports it) for READ and WRITE commands
 604              * only, as some combinations of drive, controller and chipset do
 605              * not behave correctly when DMA is enabled for other commands.
 606              */
 607             if (softc->atadev[tid]->mode >= ATA_DMA)
 608                 request_flags |= ATA_R_DMA;
 609             break;
 610
 611         }
 612
 613         if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_IN && (len & 1)) {
 614             /* ATA always transfers an even number of bytes */
 615             if ((buf = hcb->dxfer_alloc
 616                  = malloc(++len, M_ATACAM, M_NOWAIT | M_ZERO)) == NULL) {
 617                 printf("cannot allocate ATAPI/CAM buffer\n");
 618                 goto action_oom;
 619             }
 620         }
 621         request->dev = softc->atadev[tid]->dev;
 622         request->driver = hcb;
 623         request->data = buf;
 624         request->bytecount = len;
 625         request->transfersize = min(request->bytecount, 65534);
 626         request->timeout = ccb_h->timeout / 1000; /* XXX lost granularity */
 627         request->callback = &atapi_cb;
 628         request->flags = request_flags;
 629
 630         /*
 631          * no retries are to be performed at the ATA level; any retries
 632          * will be done by CAM.
 633          */
 634         request->retries = 0;
 635
 636         TAILQ_INSERT_TAIL(&softc->pending_hcbs, hcb, chain);
 637         hcb->flags |= QUEUED;
 638         ccb_h->status |= CAM_SIM_QUEUED;
 639         mtx_unlock(&softc->state_lock);
 640
 641         ata_queue_request(request);
 642         mtx_lock(&softc->state_lock);
 643         return;
 644     }
 645
 646     default:
 647         CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
 648                   ("unsupported function code 0x%02x\n", ccb_h->func_code));
 649         goto action_invalid;
 650     }
 651
 652     /* NOTREACHED */
 653
 654 action_oom:
 655     if (request != NULL)
 656         ata_free_request(request);
 657     if (hcb != NULL)
 658         free_hcb(hcb);
 659     xpt_print_path(ccb_h->path);
 660     printf("out of memory, freezing queue.\n");
 661     softc->flags |= RESOURCE_SHORTAGE;
 662     xpt_freeze_simq(sim, /*count*/ 1);
 663     ccb_h->status = CAM_REQUEUE_REQ;
 664     xpt_done(ccb);
 665     mtx_unlock(&softc->state_lock);
 666     return;
 667
 668 action_invalid:
 669     ccb_h->status = CAM_REQ_INVALID;
 670     xpt_done(ccb);
 671     mtx_unlock(&softc->state_lock);
 672     return;
 673 }
 674
 675 static void
 676 atapi_poll(struct cam_sim *sim)
 677 {
 678     /* do nothing - we do not actually service any interrupts */
 679     printf("atapi_poll called!\n");
 680 }
 681
 682 static void
 683 atapi_cb(struct ata_request *request)
 684 {
 685     struct atapi_xpt_softc *scp;
 686     struct atapi_hcb *hcb;
 687     struct ccb_scsiio *csio;
 688     u_int32_t rc;
 689
 690     hcb = (struct atapi_hcb *)request->driver;
 691     scp = hcb->softc;
 692     csio = &hcb->ccb->csio;
 693
 694 #ifdef CAMDEBUG
 695 # define err (request->u.atapi.sense.key)
 696     if (CAM_DEBUGGED(csio->ccb_h.path, CAM_DEBUG_CDB)) {
 697         printf("atapi_cb: hcb@%p sense = %02x: sk = %01x%s%s%s\n",
 698                hcb, err, err & 0x0f,
 699                (err & 0x80) ? ", Filemark" : "",
 700                (err & 0x40) ? ", EOM" : "",
 701                (err & 0x20) ? ", ILI" : "");
 702         device_printf(request->dev,
 703             "cmd %s status %02x result %02x error %02x\n",
 704             ata_cmd2str(request),
 705             request->status, request->result, request->error);
 706     }
 707 #endif
 708
 709     if ((hcb->flags & AUTOSENSE) != 0) {
 710         rc = CAM_SCSI_STATUS_ERROR;
 711         if (request->result == 0) {
 712             csio->ccb_h.status |= CAM_AUTOSNS_VALID;
 713         }
 714     } else if (request->result != 0) {
 715         if ((request->flags & ATA_R_TIMEOUT) != 0) {
 716             rc = CAM_CMD_TIMEOUT;
 717         } else {
 718             rc = CAM_SCSI_STATUS_ERROR;
 719             csio->scsi_status = SCSI_STATUS_CHECK_COND;
 720
 721             if ((csio->ccb_h.flags & CAM_DIS_AUTOSENSE) == 0) {
 722 #if 0
 723                 static const int8_t ccb[16] = { ATAPI_REQUEST_SENSE, 0, 0, 0,
 724                     sizeof(struct atapi_sense), 0, 0, 0, 0, 0, 0,
 725                     0, 0, 0, 0, 0 };
 726
 727                 bcopy (ccb, request->u.atapi.ccb, sizeof ccb);
 728                 request->data = (caddr_t)&csio->sense_data;
 729                 request->bytecount = sizeof(struct atapi_sense);
 730                 request->transfersize = min(request->bytecount, 65534);
 731                 request->timeout = csio->ccb_h.timeout / 1000;
 732                 request->retries = 2;
 733                 request->flags = ATA_R_QUIET|ATA_R_ATAPI|ATA_R_IMMEDIATE;
 734                 hcb->flags |= AUTOSENSE;
 735
 736                 ata_queue_request(request);
 737                 return;
 738 #else
 739                 /*
 740                  * Use auto-sense data from the ATA layer, if it has
 741                  * issued a REQUEST SENSE automatically and that operation
 742                  * returned without error.
 743                  */
 744                 if (request->u.atapi.sense.key != 0 && request->error == 0) {
 745                     bcopy (&request->u.atapi.sense, &csio->sense_data, sizeof(struct atapi_sense));
 746                     csio->ccb_h.status |= CAM_AUTOSNS_VALID;
 747                 }
 748             }
 749 #endif
 750         }
 751     } else {
 752         rc = CAM_REQ_CMP;
 753         csio->scsi_status = SCSI_STATUS_OK;
 754         if (((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) &&
 755             hcb->dxfer_alloc != NULL)
 756         {
 757             bcopy(hcb->dxfer_alloc, csio->data_ptr, csio->dxfer_len);
 758         }
 759     }
 760
 761     mtx_lock(&scp->state_lock);
 762     free_hcb_and_ccb_done(hcb, rc);
 763     mtx_unlock(&scp->state_lock);
 764
 765     ata_free_request(request);
 766 }
 767
 768 static void
 769 free_hcb_and_ccb_done(struct atapi_hcb *hcb, u_int32_t status)
 770 {
 771     struct atapi_xpt_softc *softc;
 772     union ccb *ccb;
 773
 774     if (hcb == NULL)
 775         return;
 776
 777     softc = hcb->softc;
 778     ccb = hcb->ccb;
 779
 780     /* we're about to free a hcb, so the shortage has ended */
 781     if (softc->flags & RESOURCE_SHORTAGE) {
 782         softc->flags &= ~RESOURCE_SHORTAGE;
 783         status |= CAM_RELEASE_SIMQ;
 784     }
 785     free_hcb(hcb);
 786     ccb->ccb_h.status =
 787         status | (ccb->ccb_h.status & ~(CAM_STATUS_MASK | CAM_SIM_QUEUED));
 788     xpt_done(ccb);
 789 }
 790
 791 static void
 792 atapi_async(void *callback_arg, u_int32_t code,
 793              struct cam_path* path, void *arg)
 794 {
 795     struct atapi_xpt_softc *softc;
 796     struct cam_sim *sim;
 797     int targ;
 798
 799     GIANT_REQUIRED;
 800
 801     sim = (struct cam_sim *) callback_arg;
 802     softc = (struct atapi_xpt_softc *) cam_sim_softc(sim);
 803     switch (code) {
 804     case AC_LOST_DEVICE:
 805         targ = xpt_path_target_id(path);
 806         xpt_print_path(path);
 807         if (targ == -1)
 808                 printf("Lost host adapter\n");
 809         else
 810                 printf("Lost target %d???\n", targ);
 811         break;
 812
 813     default:
 814         break;
 815     }
 816 }
 817
 818 static void
 819 cam_rescan_callback(struct cam_periph *periph, union ccb *ccb)
 820 {
 821         if (ccb->ccb_h.status != CAM_REQ_CMP) {
 822             CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE,
 823                       ("Rescan failed, 0x%04x\n", ccb->ccb_h.status));
 824         } else {
 825             CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE,
 826                       ("Rescan succeeded\n"));
 827         }
 828         xpt_free_path(ccb->ccb_h.path);
 829         xpt_free_ccb(ccb);
 830 }
 831
 832 static void
 833 cam_rescan(struct cam_sim *sim)
 834 {
 835     struct cam_path *path;
 836     union ccb *ccb;
 837
 838     ccb = xpt_alloc_ccb_nowait();
 839     if (ccb == NULL)
 840         return;
 841
 842     if (xpt_create_path(&path, xpt_periph, cam_sim_path(sim),
 843                         CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
 844         xpt_free_ccb(ccb);
 845         return;
 846     }
 847
 848     CAM_DEBUG(path, CAM_DEBUG_TRACE, ("Rescanning ATAPI bus.\n"));
 849     xpt_setup_ccb(&ccb->ccb_h, path, 5/*priority (low)*/);
 850     ccb->ccb_h.func_code = XPT_SCAN_BUS;
 851     ccb->ccb_h.cbfcnp = cam_rescan_callback;
 852     ccb->crcn.flags = CAM_FLAG_NONE;
 853     xpt_action(ccb);
 854     /* scan is in progress now */
 855 }
 856
 857 static struct atapi_hcb *
 858 allocate_hcb(struct atapi_xpt_softc *softc, int unit, int bus, union ccb *ccb)
 859 {
 860     struct atapi_hcb *hcb = (struct atapi_hcb *)
 861     malloc(sizeof(struct atapi_hcb), M_ATACAM, M_NOWAIT | M_ZERO);
 862
 863     if (hcb != NULL) {
 864         hcb->softc = softc;
 865         hcb->unit = unit;
 866         hcb->bus = bus;
 867         hcb->ccb = ccb;
 868     }
 869     return hcb;
 870 }
 871
 872 static void
 873 free_hcb(struct atapi_hcb *hcb)
 874 {
 875     if ((hcb->flags & QUEUED) != 0)
 876         TAILQ_REMOVE(&hcb->softc->pending_hcbs, hcb, chain);
 877     if (hcb->dxfer_alloc != NULL)
 878         free(hcb->dxfer_alloc, M_ATACAM);
 879     free(hcb, M_ATACAM);
 880 }
 881
 882 static void
 883 free_softc(struct atapi_xpt_softc *scp)
 884 {
 885     struct atapi_hcb *hcb;
 886
 887     if (scp != NULL) {
 888         mtx_lock(&scp->state_lock);
 889         TAILQ_FOREACH(hcb, &scp->pending_hcbs, chain) {
 890             free_hcb_and_ccb_done(hcb, CAM_UNREC_HBA_ERROR);
 891         }
 892         if (scp->path != NULL) {
 893             setup_async_cb(scp, 0);
 894             xpt_free_path(scp->path);
 895         }
 896         if ((scp->flags & BUS_REGISTERED) != 0) {
 897             if (xpt_bus_deregister(cam_sim_path(scp->sim)) == CAM_REQ_CMP)
 898                 scp->flags &= ~BUS_REGISTERED;
 899         }
 900         if (scp->sim != NULL) {
 901             if ((scp->flags & BUS_REGISTERED) == 0)
 902                 cam_sim_free(scp->sim, /*free_devq*/TRUE);
 903             else
 904                 printf("Can't free %s SIM (still registered)\n",
 905                        cam_sim_name(scp->sim));
 906         }
 907         mtx_destroy(&scp->state_lock);
 908     }
 909 }
 910
 911 static int
 912 atapi_cam_event_handler(module_t mod, int what, void *arg) {
 913     device_t *devlist;
 914     int devcount;
 915
 916     switch (what) {
 917         case MOD_UNLOAD:
 918             if (devclass_get_devices(atapi_cam_devclass, &devlist, &devcount)
 919                   != 0)
 920                 return ENXIO;
 921             if (devlist != NULL) {
 922                 while (devlist != NULL && devcount > 0) {
 923                     device_t child = devlist[--devcount];
 924                     struct atapi_xpt_softc *scp = device_get_softc(child);
 925
 926                     device_delete_child(device_get_parent(child),child);
 927                     if (scp != NULL)
 928                         free(scp, M_ATACAM);
 929                 }
 930                 free(devlist, M_TEMP);
 931             }
 932             break;
 933
 934         default:
 935             break;
 936     }
 937     return 0;
 938 }