sys/dev/disk/ata/atapi-cam.c

   1 /*-
   2  * Copyright (c) 2001,2002 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  * $FreeBSD: src/sys/dev/ata/atapi-cam.c,v 1.10.2.3 2003/05/21 09:24:55 thomas Exp $
  29  * $DragonFly: src/sys/dev/disk/ata/atapi-cam.c,v 1.15 2008/05/18 20:30:22 pavalos Exp $
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/bus.h>
  35 #include <sys/devicestat.h>
  36 #include <sys/kernel.h>
  37 #include <sys/malloc.h>
  38 #include <sys/ata.h>
  39 #include <sys/thread2.h>
  40
  41 #include <bus/cam/cam.h>
  42 #include <bus/cam/cam_ccb.h>
  43 #include <bus/cam/cam_periph.h>
  44 #include <bus/cam/cam_sim.h>
  45 #include <bus/cam/cam_xpt_sim.h>
  46 #include <bus/cam/cam_debug.h>
  47 #include <bus/cam/scsi/scsi_all.h>
  48
  49 #include "ata-all.h"
  50 #include "atapi-all.h"
  51
  52 /* hardware command descriptor block */
  53 struct atapi_hcb {
  54     struct atapi_xpt_softc *softc;
  55     int                 unit;
  56     int                 bus;
  57     int                 target;
  58     int                 lun;
  59     union ccb           *ccb;
  60     u_int8_t            cmd[CAM_MAX_CDBLEN];
  61     int                 flags;
  62 #define DOING_AUTOSENSE 1
  63
  64     char                *dxfer_alloc;
  65     TAILQ_ENTRY(atapi_hcb) chain;
  66 };
  67
  68 /* private data associated with an ATA bus */
  69 struct atapi_xpt_softc {
  70     struct ata_channel  *ata_ch;
  71     struct cam_path     *path;
  72     struct cam_sim      *sim;
  73     int                 flags;
  74 #define BUS_REGISTERED          0x01
  75 #define RESOURCE_SHORTAGE       0x02
  76
  77     TAILQ_HEAD(,atapi_hcb) pending_hcbs;
  78     LIST_ENTRY(atapi_xpt_softc) chain;
  79 };
  80
  81 enum reinit_reason { ATTACH, RESET };
  82
  83 static LIST_HEAD(,atapi_xpt_softc) all_buses = LIST_HEAD_INITIALIZER(all_buses);
  84
  85 /* CAM XPT methods */
  86 static void atapi_action(struct cam_sim *, union ccb *);
  87 static void atapi_poll(struct cam_sim *);
  88 static void atapi_async(void *, u_int32_t, struct cam_path *, void *);
  89 static void atapi_async1(void *, u_int32_t, struct cam_path *, void *);
  90 static int atapi_cb(struct atapi_request *);
  91
  92 /* internal functions */
  93 static void reinit_bus(struct atapi_xpt_softc *scp, enum reinit_reason reason);
  94 static void setup_dev(struct atapi_xpt_softc *, struct ata_device *);
  95 static void setup_async_cb(struct atapi_xpt_softc *, uint32_t);
  96 static void cam_rescan_callback(struct cam_periph *, union ccb *);
  97 static void cam_rescan(struct cam_sim *);
  98 static void free_hcb_and_ccb_done(struct atapi_hcb *, u_int32_t);
  99 static struct atapi_hcb *allocate_hcb(struct atapi_xpt_softc *, int, int, union ccb *);
 100 static void free_hcb(struct atapi_hcb *hcb);
 101 static void free_softc(struct atapi_xpt_softc *scp);
 102 static struct atapi_xpt_softc *get_softc(struct ata_channel *ata_ch);
 103 static struct ata_device *get_ata_device(struct atapi_xpt_softc *scp, int id);
 104
 105 static MALLOC_DEFINE(M_ATACAM, "ATA CAM transport", "ATA driver CAM-XPT layer");
 106
 107 void
 108 atapi_cam_attach_bus(struct ata_channel *ata_ch)
 109 {
 110     struct atapi_xpt_softc *scp = NULL;
 111     struct cam_devq *devq = NULL;
 112     struct cam_sim *sim = NULL;
 113     struct cam_path *path = NULL;
 114     int unit;
 115
 116     LIST_FOREACH(scp, &all_buses, chain) {
 117         if (scp->ata_ch == ata_ch)
 118             return;
 119     }
 120
 121     scp = kmalloc(sizeof(struct atapi_xpt_softc), M_ATACAM, M_INTWAIT | M_ZERO);
 122     scp->ata_ch = ata_ch;
 123     TAILQ_INIT(&scp->pending_hcbs);
 124     LIST_INSERT_HEAD(&all_buses, scp, chain);
 125     unit = device_get_unit(ata_ch->dev);
 126
 127     devq = cam_simq_alloc(16);
 128     sim = cam_sim_alloc(atapi_action, atapi_poll, "ata", (void *)scp,
 129                         unit, &sim_mplock, 1, 1, devq);
 130     cam_simq_release(devq);
 131     if (sim == NULL)
 132         goto error;
 133     scp->sim = sim;
 134
 135     if (xpt_bus_register(sim, 0) != CAM_SUCCESS) {
 136         goto error;
 137     }
 138     scp->flags |= BUS_REGISTERED;
 139
 140     if (xpt_create_path(&path, /*periph*/ NULL,
 141                 cam_sim_path(sim), CAM_TARGET_WILDCARD,
 142                 CAM_LUN_WILDCARD) != CAM_REQ_CMP) {
 143         goto error;
 144     }
 145     scp->path = path;
 146
 147     CAM_DEBUG(path, CAM_DEBUG_TRACE, ("Registered SIM for ata%d\n", unit));
 148
 149     setup_async_cb(scp, AC_LOST_DEVICE);
 150     reinit_bus(scp, ATTACH);
 151     return;
 152
 153 error:
 154     free_softc(scp);
 155 }
 156
 157 void
 158 atapi_cam_detach_bus(struct ata_channel *ata_ch)
 159 {
 160     struct atapi_xpt_softc *scp = get_softc(ata_ch);
 161     free_softc(scp);
 162 }
 163
 164 void
 165 atapi_cam_reinit_bus(struct ata_channel *ata_ch) {
 166     struct atapi_xpt_softc *scp = get_softc(ata_ch);
 167
 168     /*
 169      * scp might be null if the bus is being reinitialised during
 170      * the boot-up sequence, before the ATAPI bus is registered.
 171      */
 172
 173     if (scp != NULL)
 174         reinit_bus(scp, RESET);
 175 }
 176
 177 static void
 178 reinit_bus(struct atapi_xpt_softc *scp, enum reinit_reason reason) {
 179     if (scp->ata_ch->devices & ATA_ATAPI_MASTER)
 180         setup_dev(scp, &scp->ata_ch->device[MASTER]);
 181     if (scp->ata_ch->devices & ATA_ATAPI_SLAVE)
 182         setup_dev(scp, &scp->ata_ch->device[SLAVE]);
 183
 184     switch (reason) {
 185         case RESET:
 186             xpt_async(AC_BUS_RESET, scp->path, NULL);
 187             /*FALLTHROUGH*/
 188         case ATTACH:
 189             cam_rescan(scp->sim);
 190             break;
 191     }
 192 }
 193
 194 static void
 195 setup_dev(struct atapi_xpt_softc *scp, struct ata_device *atp)
 196 {
 197     if (atp->driver == NULL) {
 198         ata_set_name(atp, "atapicam",
 199                      2 * device_get_unit(atp->channel->dev) +
 200                      (atp->unit == ATA_MASTER) ? 0 : 1);
 201         atp->driver = (void *)scp;
 202     }
 203 }
 204
 205 static void
 206 setup_async_cb(struct atapi_xpt_softc *scp, uint32_t events)
 207 {
 208     struct ccb_setasync csa;
 209
 210     xpt_setup_ccb(&csa.ccb_h, scp->path, /*priority*/ 5);
 211     csa.ccb_h.func_code = XPT_SASYNC_CB;
 212     csa.event_enable = events;
 213     csa.callback = &atapi_async;
 214     csa.callback_arg = scp->sim;
 215     xpt_action((union ccb *) &csa);
 216 }
 217
 218 static void
 219 atapi_action(struct cam_sim *sim, union ccb *ccb)
 220 {
 221     struct atapi_xpt_softc *softc = (struct atapi_xpt_softc*)cam_sim_softc(sim);
 222     struct ccb_hdr *ccb_h = &ccb->ccb_h;
 223     struct atapi_hcb *hcb = NULL;
 224     int unit = cam_sim_unit(sim);
 225     int bus = cam_sim_bus(sim);
 226     int len;
 227     char *buf;
 228
 229     switch (ccb_h->func_code) {
 230     case XPT_PATH_INQ: {
 231         struct ccb_pathinq *cpi = &ccb->cpi;
 232
 233         cpi->version_num = 1;
 234         cpi->hba_inquiry = 0;
 235         cpi->target_sprt = 0;
 236 #if !defined(NO_ATANG)
 237         cpi->hba_misc = PIM_NO_6_BYTE;
 238 #else
 239         cpi->hba_misc = 0;
 240 #endif
 241         cpi->hba_eng_cnt = 0;
 242         bzero(cpi->vuhba_flags, sizeof(cpi->vuhba_flags));
 243         cpi->max_target = 1;
 244         cpi->max_lun = 0;
 245         cpi->async_flags = 0;
 246         cpi->hpath_id = 0;
 247         cpi->initiator_id = 7;
 248         strncpy(cpi->sim_vid, "FreeBSD", sizeof(cpi->sim_vid));
 249         strncpy(cpi->hba_vid, "ATAPI", sizeof(cpi->hba_vid));
 250         strncpy(cpi->dev_name, cam_sim_name(sim), sizeof cpi->dev_name);
 251         cpi->unit_number = cam_sim_unit(sim);
 252         cpi->bus_id = cam_sim_bus(sim);
 253         cpi->base_transfer_speed = 3300;
 254         cpi->transport = XPORT_ATA;
 255         cpi->transport_version = 2;
 256         cpi->protocol = PROTO_SCSI;
 257         cpi->protocol_version = SCSI_REV_2;
 258         if (softc->ata_ch && ccb_h->target_id != CAM_TARGET_WILDCARD) {
 259             switch (softc->ata_ch->device[ccb_h->target_id].mode) {
 260             case ATA_PIO1:
 261                 cpi->base_transfer_speed = 5200;
 262                 break;
 263             case ATA_PIO2:
 264                 cpi->base_transfer_speed = 7000;
 265                 break;
 266             case ATA_PIO3:
 267                 cpi->base_transfer_speed = 11000;
 268                 break;
 269             case ATA_PIO4:
 270             case ATA_DMA:
 271             case ATA_WDMA2:
 272                 cpi->base_transfer_speed = 16000;
 273                 break;
 274             case ATA_UDMA2:
 275                 cpi->base_transfer_speed = 33000;
 276                 break;
 277             case ATA_UDMA4:
 278                 cpi->base_transfer_speed = 66000;
 279                 break;
 280             case ATA_UDMA5:
 281                 cpi->base_transfer_speed = 100000;
 282                 break;
 283             case ATA_UDMA6:
 284                 cpi->base_transfer_speed = 133000;
 285                 break;
 286             default:
 287                 break;
 288             }
 289         }
 290         ccb->ccb_h.status = CAM_REQ_CMP;
 291         xpt_done(ccb);
 292         return;
 293     }
 294
 295     case XPT_RESET_DEV: {
 296         int tid = ccb_h->target_id;
 297         struct ata_device *dev = get_ata_device(softc, tid);
 298
 299         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("dev reset\n"));
 300         atapi_reinit(dev);
 301         ccb->ccb_h.status = CAM_REQ_CMP;
 302         xpt_done(ccb);
 303         return;
 304     }
 305
 306     case XPT_RESET_BUS:
 307         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("bus reset\n"));
 308         ata_reinit(softc->ata_ch);
 309         ccb->ccb_h.status = CAM_REQ_CMP;
 310         xpt_done(ccb);
 311         return;
 312
 313     case XPT_SET_TRAN_SETTINGS:
 314         /* ignore these, we're not doing SCSI here */
 315         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE,
 316                   ("SET_TRAN_SETTINGS not supported\n"));
 317         ccb->ccb_h.status = CAM_FUNC_NOTAVAIL;
 318         xpt_done(ccb);
 319         return;
 320
 321     case XPT_GET_TRAN_SETTINGS: {
 322         struct ccb_trans_settings *cts = &ccb->cts;
 323         cts->protocol = PROTO_SCSI;
 324         cts->protocol_version = SCSI_REV_2;
 325         cts->transport = XPORT_ATA;
 326         cts->transport_version = XPORT_VERSION_UNSPECIFIED;
 327         cts->proto_specific.valid = 0;
 328         cts->xport_specific.valid = 0;
 329         /* nothing more to do */
 330         ccb->ccb_h.status = CAM_REQ_CMP;
 331         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("GET_TRAN_SETTINGS\n"));
 332         xpt_done(ccb);
 333         return;
 334     }
 335
 336     case XPT_CALC_GEOMETRY: {
 337         struct ccb_calc_geometry *ccg;
 338         unsigned int size_mb;
 339         unsigned int secs_per_cylinder;
 340         int extended;
 341
 342         CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_SUBTRACE, ("CALC_GEOMETRY\n"));
 343         ccg = &ccb->ccg;
 344         size_mb = ccg->volume_size / ((1024L * 1024L) / ccg->block_size);
 345         extended = 1;
 346
 347         if (size_mb > 1024 && extended) {
 348             ccg->heads = 255;
 349             ccg->secs_per_track = 63;
 350         } else {
 351             ccg->heads = 64;
 352             ccg->secs_per_track = 32;
 353         }
 354         secs_per_cylinder = ccg->heads * ccg->secs_per_track;
 355         ccg->cylinders = ccg->volume_size / secs_per_cylinder;
 356         ccb->ccb_h.status = CAM_REQ_CMP;
 357         xpt_done(ccb);
 358         return;
 359     }
 360
 361     case XPT_SCSI_IO: {
 362         struct ccb_scsiio *csio = &ccb->csio;
 363         int tid = ccb_h->target_id, lid = ccb_h->target_lun;
 364         struct ata_device *dev = get_ata_device(softc, tid);
 365
 366         CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE, ("XPT_SCSI_IO\n"));
 367
 368         /* check that this request was not aborted already */
 369         if ((ccb_h->status & CAM_STATUS_MASK) != CAM_REQ_INPROG) {
 370             kprintf("XPT_SCSI_IO received but already in progress?\n");
 371             xpt_done(ccb);
 372             return;
 373         }
 374         if (dev == NULL) {
 375             CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
 376                       ("SCSI IO received for invalid device\n"));
 377             ccb_h->status = CAM_TID_INVALID;
 378             xpt_done(ccb);
 379             return;
 380         }
 381         if (lid > 0) {
 382             CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
 383                       ("SCSI IO received for invalid lun %d\n", lid));
 384             ccb_h->status = CAM_LUN_INVALID;
 385             xpt_done(ccb);
 386             return;
 387         }
 388         if ((ccb_h->flags & CAM_SCATTER_VALID)) {
 389             /* scatter-gather not supported */
 390             xpt_print_path(ccb_h->path);
 391             kprintf("ATAPI-CAM does not support scatter-gather yet!\n");
 392             break;
 393         }
 394         if ((hcb = allocate_hcb(softc, unit, bus, ccb)) == NULL)
 395             goto action_oom;
 396
 397         ccb_h->status |= CAM_SIM_QUEUED;
 398
 399         bcopy((ccb_h->flags & CAM_CDB_POINTER) ?
 400               csio->cdb_io.cdb_ptr : csio->cdb_io.cdb_bytes,
 401               hcb->cmd, csio->cdb_len);
 402 #ifdef CAMDEBUG
 403         if (CAM_DEBUGGED(ccb_h->path, CAM_DEBUG_CDB)) {
 404                 char cdb_str[(SCSI_MAX_CDBLEN * 3) + 1];
 405
 406                 kprintf("atapi_action: hcb@%p: %s\n", hcb,
 407                        scsi_cdb_string(hcb->cmd, cdb_str, sizeof(cdb_str)));
 408         }
 409 #endif
 410
 411         len = csio->dxfer_len;
 412         buf = csio->data_ptr;
 413
 414         /* some SCSI commands require special processing */
 415         switch (hcb->cmd[0]) {
 416         case INQUIRY: {
 417             /*
 418              * many ATAPI devices seem to report more than
 419              * SHORT_INQUIRY_LENGTH bytes of available INQUIRY
 420              * information, but respond with some incorrect condition
 421              * when actually asked for it, so we are going to pretend
 422              * that only SHORT_INQUIRY_LENGTH are expected, anyway.
 423              */
 424             struct scsi_inquiry *inq = (struct scsi_inquiry *) &hcb->cmd[0];
 425
 426             if (inq->byte2 == 0 && inq->page_code == 0 &&
 427                 inq->length > SHORT_INQUIRY_LENGTH) {
 428                 bzero(buf, len);
 429                 len = inq->length = SHORT_INQUIRY_LENGTH;
 430             }
 431             break;
 432         }
 433 #if defined(NO_ATANG)           /* EXITED IN ORIGINAL, DELETED IN ATANG */
 434         case MODE_SELECT_6:
 435             /* FALLTHROUGH */
 436
 437         case MODE_SENSE_6:
 438             /*
 439              * not supported by ATAPI/MMC devices (per SCSI MMC spec)
 440              * translate to _10 equivalent.
 441              * (actually we should do this only if we have tried
 442              * MODE_foo_6 and received ILLEGAL_REQUEST or
 443              * INVALID COMMAND OPERATION CODE)
 444              * alternative fix: behave like a honest CAM transport,
 445              * do not muck with CDB contents, and change scsi_cd to
 446              * always use MODE_SENSE_10 in cdgetmode(), or let scsi_cd
 447              * know that this specific unit is an ATAPI/MMC one,
 448              * and in /that case/ use MODE_SENSE_10
 449              */
 450
 451             CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
 452                       ("Translating %s into _10 equivalent\n",
 453                       (hcb->cmd[0] == MODE_SELECT_6) ?
 454                       "MODE_SELECT_6" : "MODE_SENSE_6"));
 455             hcb->cmd[0] |= 0x40;
 456             hcb->cmd[6] = 0;
 457             hcb->cmd[7] = 0;
 458             hcb->cmd[8] = hcb->cmd[4];
 459             hcb->cmd[9] = hcb->cmd[5];
 460             hcb->cmd[4] = 0;
 461             hcb->cmd[5] = 0;
 462             break;
 463 #endif
 464
 465         case READ_6:
 466             /* FALLTHROUGH */
 467
 468         case WRITE_6:
 469             CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
 470                       ("Translating %s into _10 equivalent\n",
 471                       (hcb->cmd[0] == READ_6) ? "READ_6" : "WRITE_6"));
 472             hcb->cmd[0] |= 0x20;
 473             hcb->cmd[9] = hcb->cmd[5];
 474             hcb->cmd[8] = hcb->cmd[4];
 475             hcb->cmd[7] = 0;
 476             hcb->cmd[6] = 0;
 477             hcb->cmd[5] = hcb->cmd[3];
 478             hcb->cmd[4] = hcb->cmd[2];
 479             hcb->cmd[3] = hcb->cmd[1] & 0x1f;
 480             hcb->cmd[2] = 0;
 481             hcb->cmd[1] = 0;
 482             break;
 483         }
 484
 485         if ((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_IN && (len & 1)) {
 486             /* ATA always transfers an even number of bytes */
 487             ++len;
 488             buf = hcb->dxfer_alloc = kmalloc(len, M_ATACAM, M_INTWAIT | M_ZERO);
 489         }
 490         crit_enter();
 491         TAILQ_INSERT_TAIL(&softc->pending_hcbs, hcb, chain);
 492         crit_exit();
 493         if (atapi_queue_cmd(dev, hcb->cmd, buf, len,
 494                             (((ccb_h->flags & CAM_DIR_MASK) == CAM_DIR_IN) ?
 495                             ATPR_F_READ : 0) | ATPR_F_QUIET,
 496                             ccb_h->timeout, atapi_cb, (void *)hcb) == 0)
 497             return;
 498         break;
 499     }
 500
 501     default:
 502         CAM_DEBUG(ccb_h->path, CAM_DEBUG_SUBTRACE,
 503                   ("unsupported function code 0x%02x\n", ccb_h->func_code));
 504         ccb_h->status = CAM_REQ_INVALID;
 505         xpt_done(ccb);
 506         return;
 507     }
 508
 509 action_oom:
 510     if (hcb != NULL)
 511         free_hcb(hcb);
 512     xpt_print_path(ccb_h->path);
 513     kprintf("out of memory, freezing queue.\n");
 514     softc->flags |= RESOURCE_SHORTAGE;
 515     xpt_freeze_simq(sim, /*count*/ 1);
 516     ccb_h->status = CAM_REQUEUE_REQ;
 517     xpt_done(ccb);
 518 }
 519
 520 static void
 521 atapi_poll(struct cam_sim *sim)
 522 {
 523     /* do nothing - we do not actually service any interrupts */
 524     kprintf("atapi_poll called!\n");
 525 }
 526
 527 static int
 528 atapi_cb(struct atapi_request *req)
 529 {
 530     struct atapi_hcb *hcb = (struct atapi_hcb *) req->driver;
 531     struct ccb_scsiio *csio = &hcb->ccb->csio;
 532     int hcb_status = req->result;
 533
 534     crit_enter();
 535 #ifdef CAMDEBUG
 536         if (CAM_DEBUGGED(csio->ccb_h.path, CAM_DEBUG_CDB)) {
 537                 kprintf("atapi_cb: hcb@%p status = %02x: (sk = %02x%s%s%s)\n",
 538                        hcb, hcb_status, hcb_status >> 4,
 539                        (hcb_status & 4) ? " ABRT" : "",
 540                        (hcb_status & 2) ? " EOM" : "",
 541                        (hcb_status & 1) ? " ILI" : "");
 542                 kprintf("    %s: cmd %02x - sk=%02x asc=%02x ascq=%02x\n",
 543                        req->device->name, req->ccb[0], req->sense.sense_key,
 544                        req->sense.asc, req->sense.ascq);
 545         }
 546 #endif
 547     if (hcb_status != 0) {
 548         csio->scsi_status = SCSI_STATUS_CHECK_COND;
 549         if ((csio->ccb_h.flags & CAM_DIS_AUTOSENSE) == 0) {
 550             csio->ccb_h.status |= CAM_AUTOSNS_VALID;
 551             bcopy((void *)&req->sense, (void *)&csio->sense_data,
 552                   sizeof(struct atapi_reqsense));
 553         }
 554         free_hcb_and_ccb_done(hcb, CAM_SCSI_STATUS_ERROR);
 555     }
 556     else {
 557         if (((csio->ccb_h.flags & CAM_DIR_MASK) == CAM_DIR_IN) &&
 558             hcb->dxfer_alloc != NULL)
 559             bcopy(hcb->dxfer_alloc, csio->data_ptr, csio->dxfer_len);
 560         csio->scsi_status = SCSI_STATUS_OK;
 561         free_hcb_and_ccb_done(hcb, CAM_REQ_CMP);
 562     }
 563     crit_exit();
 564     return 0;
 565 }
 566
 567 static void
 568 free_hcb_and_ccb_done(struct atapi_hcb *hcb, u_int32_t status)
 569 {
 570     struct atapi_xpt_softc *softc = hcb->softc;
 571     union ccb *ccb = hcb->ccb;
 572
 573     if (hcb != NULL) {
 574         /* we're about to free a hcb, so the shortage has ended */
 575         if (softc->flags & RESOURCE_SHORTAGE) {
 576             softc->flags &= ~RESOURCE_SHORTAGE;
 577             status |= CAM_RELEASE_SIMQ;
 578         }
 579         free_hcb(hcb);
 580     }
 581     ccb->ccb_h.status =
 582         status | (ccb->ccb_h.status & ~(CAM_STATUS_MASK | CAM_SIM_QUEUED));
 583     xpt_done(ccb);
 584 }
 585
 586 static void
 587 atapi_async(void *callback_arg, u_int32_t code,
 588             struct cam_path *path, void *arg)
 589 {
 590     crit_enter();
 591     atapi_async1(callback_arg, code, path, arg);
 592     crit_exit();
 593 }
 594
 595 static void
 596 atapi_async1(void *callback_arg, u_int32_t code,
 597              struct cam_path* path, void *arg)
 598 {
 599     struct atapi_xpt_softc *softc;
 600     struct cam_sim *sim;
 601     int targ;
 602
 603     sim = (struct cam_sim *) callback_arg;
 604     softc = (struct atapi_xpt_softc *) cam_sim_softc(sim);
 605     switch (code) {
 606     case AC_LOST_DEVICE:
 607         targ = xpt_path_target_id(path);
 608         xpt_print_path(path);
 609         if (targ == -1)
 610                 kprintf("Lost host adapter\n");
 611         else
 612                 kprintf("Lost target %d???\n", targ);
 613         break;
 614
 615     default:
 616         break;
 617     }
 618 }
 619
 620 static void
 621 cam_rescan_callback(struct cam_periph *periph, union ccb *ccb)
 622 {
 623         if (ccb->ccb_h.status != CAM_REQ_CMP) {
 624             CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE,
 625                       ("Rescan failed, 0x%04x\n", ccb->ccb_h.status));
 626         } else {
 627             CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE,
 628                       ("Rescan succeeded\n"));
 629         }
 630         xpt_free_path(ccb->ccb_h.path);
 631         kfree(ccb, M_ATACAM);
 632 }
 633
 634 static void
 635 cam_rescan(struct cam_sim *sim)
 636 {
 637     struct cam_path *path;
 638     union ccb *ccb = kmalloc(sizeof(union ccb), M_ATACAM, M_INTWAIT | M_ZERO);
 639
 640     if (xpt_create_path(&path, xpt_periph, cam_sim_path(sim),
 641                         CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD) != CAM_REQ_CMP)
 642         return;
 643
 644     CAM_DEBUG(ccb->ccb_h.path, CAM_DEBUG_TRACE, ("Rescanning ATAPI bus.\n"));
 645     xpt_setup_ccb(&ccb->ccb_h, path, 5/*priority (low)*/);
 646     ccb->ccb_h.func_code = XPT_SCAN_BUS;
 647     ccb->ccb_h.cbfcnp = cam_rescan_callback;
 648     ccb->crcn.flags = CAM_FLAG_NONE;
 649     xpt_action(ccb);
 650     /* scan is in progress now */
 651 }
 652
 653 static struct atapi_hcb *
 654 allocate_hcb(struct atapi_xpt_softc *softc, int unit, int bus, union ccb *ccb)
 655 {
 656     struct atapi_hcb *hcb;
 657
 658     hcb = kmalloc(sizeof(struct atapi_hcb), M_ATACAM, M_INTWAIT | M_ZERO);
 659
 660     if (hcb != NULL) {
 661         hcb->softc = softc;
 662         hcb->unit = unit;
 663         hcb->bus = bus;
 664         hcb->ccb = ccb;
 665     }
 666     return hcb;
 667 }
 668
 669 static void
 670 free_hcb(struct atapi_hcb *hcb)
 671 {
 672     TAILQ_REMOVE(&hcb->softc->pending_hcbs, hcb, chain);
 673     if (hcb->dxfer_alloc != NULL)
 674         kfree(hcb->dxfer_alloc, M_ATACAM);
 675     kfree(hcb, M_ATACAM);
 676 }
 677
 678 static void
 679 free_softc(struct atapi_xpt_softc *scp)
 680 {
 681     struct atapi_hcb *hcb;
 682
 683     if (scp != NULL) {
 684         TAILQ_FOREACH(hcb, &scp->pending_hcbs, chain) {
 685             free_hcb_and_ccb_done(hcb, CAM_UNREC_HBA_ERROR);
 686         }
 687         if (scp->path != NULL) {
 688             setup_async_cb(scp, 0);
 689             xpt_free_path(scp->path);
 690         }
 691         if ((scp->flags & BUS_REGISTERED) != 0) {
 692             if (xpt_bus_deregister(cam_sim_path(scp->sim)) == CAM_REQ_CMP)
 693                 scp->flags &= ~BUS_REGISTERED;
 694         }
 695         if (scp->sim != NULL) {
 696             if ((scp->flags & BUS_REGISTERED) == 0)
 697                 cam_sim_free(scp->sim);
 698             else
 699                 kprintf("Can't free %s SIM (still registered)\n",
 700                        cam_sim_name(scp->sim));
 701         }
 702         LIST_REMOVE(scp, chain);
 703         kfree(scp, M_ATACAM);
 704     }
 705 }
 706
 707 static struct atapi_xpt_softc *
 708 get_softc(struct ata_channel *ata_ch) {
 709     struct atapi_xpt_softc *scp;
 710     LIST_FOREACH(scp, &all_buses, chain) {
 711         if (scp->ata_ch == ata_ch)
 712             return scp;
 713     }
 714     return NULL;
 715 }
 716
 717 static struct ata_device *
 718 get_ata_device(struct atapi_xpt_softc *scp, int id)
 719 {
 720     int role = ATA_ATAPI_MASTER;
 721
 722     switch (id) {
 723     case 1:
 724         role = ATA_ATAPI_SLAVE;
 725         /* FALLTHROUGH */
 726
 727     case 0:
 728         if (scp->ata_ch->devices & role)
 729             return &scp->ata_ch->device[id];
 730         /* FALLTHROUGH */
 731
 732     default:
 733         return NULL;
 734     }
 735 }