sys/cam/scsi/scsi_targ_bh.c

   1 /*-
   2  * Implementation of the Target Mode 'Black Hole device' for CAM.
   3  *
   4  * Copyright (c) 1999 Justin T. Gibbs.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification, immediately at the beginning of the file.
  13  * 2. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/queue.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/types.h>
  37 #include <sys/bio.h>
  38 #include <sys/conf.h>
  39 #include <sys/devicestat.h>
  40 #include <sys/malloc.h>
  41 #include <sys/uio.h>
  42
  43 #include <cam/cam.h>
  44 #include <cam/cam_ccb.h>
  45 #include <cam/cam_periph.h>
  46 #include <cam/cam_queue.h>
  47 #include <cam/cam_xpt_periph.h>
  48 #include <cam/cam_debug.h>
  49
  50 #include <cam/scsi/scsi_all.h>
  51 #include <cam/scsi/scsi_message.h>
  52
  53 typedef enum {
  54         TARGBH_STATE_NORMAL,
  55         TARGBH_STATE_EXCEPTION,
  56         TARGBH_STATE_TEARDOWN
  57 } targbh_state;
  58
  59 typedef enum {
  60         TARGBH_FLAG_NONE         = 0x00,
  61         TARGBH_FLAG_LUN_ENABLED  = 0x01
  62 } targbh_flags;
  63
  64 typedef enum {
  65         TARGBH_CCB_WORKQ,
  66         TARGBH_CCB_WAITING
  67 } targbh_ccb_types;
  68
  69 #define MAX_ACCEPT      8
  70 #define MAX_IMMEDIATE   16
  71 #define MAX_BUF_SIZE    256     /* Max inquiry/sense/mode page transfer */
  72
  73 /* Offsets into our private CCB area for storing accept information */
  74 #define ccb_type        ppriv_field0
  75 #define ccb_descr       ppriv_ptr1
  76
  77 /* We stick a pointer to the originating accept TIO in each continue I/O CCB */
  78 #define ccb_atio        ppriv_ptr1
  79
  80 TAILQ_HEAD(ccb_queue, ccb_hdr);
  81
  82 struct targbh_softc {
  83         struct          ccb_queue pending_queue;
  84         struct          ccb_queue work_queue;
  85         struct          ccb_queue unknown_atio_queue;
  86         struct          devstat device_stats;
  87         targbh_state    state;
  88         targbh_flags    flags;
  89         u_int           init_level;
  90         u_int           inq_data_len;
  91         struct          ccb_accept_tio *accept_tio_list;
  92         struct          ccb_hdr_slist immed_notify_slist;
  93 };
  94
  95 struct targbh_cmd_desc {
  96         struct    ccb_accept_tio* atio_link;
  97         u_int     data_resid;   /* How much left to transfer */
  98         u_int     data_increment;/* Amount to send before next disconnect */
  99         void*     data;         /* The data. Can be from backing_store or not */
 100         void*     backing_store;/* Backing store allocated for this descriptor*/
 101         u_int     max_size;     /* Size of backing_store */
 102         u_int32_t timeout;
 103         u_int8_t  status;       /* Status to return to initiator */
 104 };
 105
 106 static struct scsi_inquiry_data no_lun_inq_data =
 107 {
 108         T_NODEVICE | (SID_QUAL_BAD_LU << 5), 0,
 109         /* version */2, /* format version */2
 110 };
 111
 112 static struct scsi_sense_data no_lun_sense_data =
 113 {
 114         SSD_CURRENT_ERROR|SSD_ERRCODE_VALID,
 115         0,
 116         SSD_KEY_NOT_READY,
 117         { 0, 0, 0, 0 },
 118         /*extra_len*/offsetof(struct scsi_sense_data, fru)
 119                    - offsetof(struct scsi_sense_data, extra_len),
 120         { 0, 0, 0, 0 },
 121         /* Logical Unit Not Supported */
 122         /*ASC*/0x25, /*ASCQ*/0
 123 };
 124
 125 static const int request_sense_size = offsetof(struct scsi_sense_data, fru);
 126
 127 static periph_init_t    targbhinit;
 128 static void             targbhasync(void *callback_arg, u_int32_t code,
 129                                     struct cam_path *path, void *arg);
 130 static cam_status       targbhenlun(struct cam_periph *periph);
 131 static cam_status       targbhdislun(struct cam_periph *periph);
 132 static periph_ctor_t    targbhctor;
 133 static periph_dtor_t    targbhdtor;
 134 static periph_start_t   targbhstart;
 135 static void             targbhdone(struct cam_periph *periph,
 136                                    union ccb *done_ccb);
 137 #ifdef NOTYET
 138 static  int             targbherror(union ccb *ccb, u_int32_t cam_flags,
 139                                     u_int32_t sense_flags);
 140 #endif
 141 static struct targbh_cmd_desc*  targbhallocdescr(void);
 142 static void             targbhfreedescr(struct targbh_cmd_desc *buf);
 143
 144 static struct periph_driver targbhdriver =
 145 {
 146         targbhinit, "targbh",
 147         TAILQ_HEAD_INITIALIZER(targbhdriver.units), /* generation */ 0
 148 };
 149
 150 PERIPHDRIVER_DECLARE(targbh, targbhdriver);
 151
 152 static void
 153 targbhinit(void)
 154 {
 155         cam_status status;
 156         struct cam_path *path;
 157
 158         /*
 159          * Install a global async callback.  This callback will
 160          * receive async callbacks like "new path registered".
 161          */
 162         status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
 163                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
 164
 165         if (status == CAM_REQ_CMP) {
 166                 struct ccb_setasync csa;
 167
 168                 xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5);
 169                 csa.ccb_h.func_code = XPT_SASYNC_CB;
 170                 csa.event_enable = AC_PATH_REGISTERED | AC_PATH_DEREGISTERED;
 171                 csa.callback = targbhasync;
 172                 csa.callback_arg = NULL;
 173                 xpt_action((union ccb *)&csa);
 174                 status = csa.ccb_h.status;
 175                 xpt_free_path(path);
 176         }
 177
 178         if (status != CAM_REQ_CMP) {
 179                 printf("targbh: Failed to attach master async callback "
 180                        "due to status 0x%x!\n", status);
 181         }
 182 }
 183
 184 static void
 185 targbhasync(void *callback_arg, u_int32_t code,
 186             struct cam_path *path, void *arg)
 187 {
 188         struct cam_path *new_path;
 189         struct ccb_pathinq *cpi;
 190         path_id_t bus_path_id;
 191         cam_status status;
 192
 193         cpi = (struct ccb_pathinq *)arg;
 194         if (code == AC_PATH_REGISTERED)
 195                 bus_path_id = cpi->ccb_h.path_id;
 196         else
 197                 bus_path_id = xpt_path_path_id(path);
 198         /*
 199          * Allocate a peripheral instance for
 200          * this target instance.
 201          */
 202         status = xpt_create_path(&new_path, NULL,
 203                                  bus_path_id,
 204                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
 205         if (status != CAM_REQ_CMP) {
 206                 printf("targbhasync: Unable to create path "
 207                         "due to status 0x%x\n", status);
 208                 return;
 209         }
 210
 211         switch (code) {
 212         case AC_PATH_REGISTERED:
 213         {
 214                 /* Only attach to controllers that support target mode */
 215                 if ((cpi->target_sprt & PIT_PROCESSOR) == 0)
 216                         break;
 217
 218                 status = cam_periph_alloc(targbhctor, NULL, targbhdtor,
 219                                           targbhstart,
 220                                           "targbh", CAM_PERIPH_BIO,
 221                                           new_path, targbhasync,
 222                                           AC_PATH_REGISTERED,
 223                                           cpi);
 224                 break;
 225         }
 226         case AC_PATH_DEREGISTERED:
 227         {
 228                 struct cam_periph *periph;
 229
 230                 if ((periph = cam_periph_find(new_path, "targbh")) != NULL)
 231                         cam_periph_invalidate(periph);
 232                 break;
 233         }
 234         default:
 235                 break;
 236         }
 237         xpt_free_path(new_path);
 238 }
 239
 240 /* Attempt to enable our lun */
 241 static cam_status
 242 targbhenlun(struct cam_periph *periph)
 243 {
 244         union ccb immed_ccb;
 245         struct targbh_softc *softc;
 246         cam_status status;
 247         int i;
 248
 249         softc = (struct targbh_softc *)periph->softc;
 250
 251         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0)
 252                 return (CAM_REQ_CMP);
 253
 254         xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, /*priority*/1);
 255         immed_ccb.ccb_h.func_code = XPT_EN_LUN;
 256
 257         /* Don't need support for any vendor specific commands */
 258         immed_ccb.cel.grp6_len = 0;
 259         immed_ccb.cel.grp7_len = 0;
 260         immed_ccb.cel.enable = 1;
 261         xpt_action(&immed_ccb);
 262         status = immed_ccb.ccb_h.status;
 263         if (status != CAM_REQ_CMP) {
 264                 xpt_print_path(periph->path);
 265                 printf("targbhenlun - Enable Lun Rejected with status 0x%x\n",
 266                        status);
 267                 return (status);
 268         }
 269
 270         softc->flags |= TARGBH_FLAG_LUN_ENABLED;
 271
 272         /*
 273          * Build up a buffer of accept target I/O
 274          * operations for incoming selections.
 275          */
 276         for (i = 0; i < MAX_ACCEPT; i++) {
 277                 struct ccb_accept_tio *atio;
 278
 279                 atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_DEVBUF,
 280                                                       M_NOWAIT);
 281                 if (atio == NULL) {
 282                         status = CAM_RESRC_UNAVAIL;
 283                         break;
 284                 }
 285
 286                 atio->ccb_h.ccb_descr = targbhallocdescr();
 287
 288                 if (atio->ccb_h.ccb_descr == NULL) {
 289                         free(atio, M_DEVBUF);
 290                         status = CAM_RESRC_UNAVAIL;
 291                         break;
 292                 }
 293
 294                 xpt_setup_ccb(&atio->ccb_h, periph->path, /*priority*/1);
 295                 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO;
 296                 atio->ccb_h.cbfcnp = targbhdone;
 297                 xpt_action((union ccb *)atio);
 298                 status = atio->ccb_h.status;
 299                 if (status != CAM_REQ_INPROG) {
 300                         targbhfreedescr(atio->ccb_h.ccb_descr);
 301                         free(atio, M_DEVBUF);
 302                         break;
 303                 }
 304                 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link =
 305                     softc->accept_tio_list;
 306                 softc->accept_tio_list = atio;
 307         }
 308
 309         if (i == 0) {
 310                 xpt_print_path(periph->path);
 311                 printf("targbhenlun - Could not allocate accept tio CCBs: "
 312                        "status = 0x%x\n", status);
 313                 targbhdislun(periph);
 314                 return (CAM_REQ_CMP_ERR);
 315         }
 316
 317         /*
 318          * Build up a buffer of immediate notify CCBs
 319          * so the SIM can tell us of asynchronous target mode events.
 320          */
 321         for (i = 0; i < MAX_ACCEPT; i++) {
 322                 struct ccb_immed_notify *inot;
 323
 324                 inot = (struct ccb_immed_notify*)malloc(sizeof(*inot), M_DEVBUF,
 325                                                         M_NOWAIT);
 326
 327                 if (inot == NULL) {
 328                         status = CAM_RESRC_UNAVAIL;
 329                         break;
 330                 }
 331
 332                 xpt_setup_ccb(&inot->ccb_h, periph->path, /*priority*/1);
 333                 inot->ccb_h.func_code = XPT_IMMED_NOTIFY;
 334                 inot->ccb_h.cbfcnp = targbhdone;
 335                 xpt_action((union ccb *)inot);
 336                 status = inot->ccb_h.status;
 337                 if (status != CAM_REQ_INPROG) {
 338                         free(inot, M_DEVBUF);
 339                         break;
 340                 }
 341                 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h,
 342                                   periph_links.sle);
 343         }
 344
 345         if (i == 0) {
 346                 xpt_print_path(periph->path);
 347                 printf("targbhenlun - Could not allocate immediate notify "
 348                        "CCBs: status = 0x%x\n", status);
 349                 targbhdislun(periph);
 350                 return (CAM_REQ_CMP_ERR);
 351         }
 352
 353         return (CAM_REQ_CMP);
 354 }
 355
 356 static cam_status
 357 targbhdislun(struct cam_periph *periph)
 358 {
 359         union ccb ccb;
 360         struct targbh_softc *softc;
 361         struct ccb_accept_tio* atio;
 362         struct ccb_hdr *ccb_h;
 363
 364         softc = (struct targbh_softc *)periph->softc;
 365         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0)
 366                 return CAM_REQ_CMP;
 367
 368         /* XXX Block for Continue I/O completion */
 369
 370         /* Kill off all ACCECPT and IMMEDIATE CCBs */
 371         while ((atio = softc->accept_tio_list) != NULL) {
 372
 373                 softc->accept_tio_list =
 374                     ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link;
 375                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1);
 376                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 377                 ccb.cab.abort_ccb = (union ccb *)atio;
 378                 xpt_action(&ccb);
 379         }
 380
 381         while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) {
 382                 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle);
 383                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1);
 384                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 385                 ccb.cab.abort_ccb = (union ccb *)ccb_h;
 386                 xpt_action(&ccb);
 387         }
 388
 389         /*
 390          * Dissable this lun.
 391          */
 392         xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, /*priority*/1);
 393         ccb.cel.ccb_h.func_code = XPT_EN_LUN;
 394         ccb.cel.enable = 0;
 395         xpt_action(&ccb);
 396
 397         if (ccb.cel.ccb_h.status != CAM_REQ_CMP)
 398                 printf("targbhdislun - Disabling lun on controller failed "
 399                        "with status 0x%x\n", ccb.cel.ccb_h.status);
 400         else
 401                 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED;
 402         return (ccb.cel.ccb_h.status);
 403 }
 404
 405 static cam_status
 406 targbhctor(struct cam_periph *periph, void *arg)
 407 {
 408         struct targbh_softc *softc;
 409
 410         /* Allocate our per-instance private storage */
 411         softc = (struct targbh_softc *)malloc(sizeof(*softc),
 412                                               M_DEVBUF, M_NOWAIT);
 413         if (softc == NULL) {
 414                 printf("targctor: unable to malloc softc\n");
 415                 return (CAM_REQ_CMP_ERR);
 416         }
 417
 418         bzero(softc, sizeof(*softc));
 419         TAILQ_INIT(&softc->pending_queue);
 420         TAILQ_INIT(&softc->work_queue);
 421         softc->accept_tio_list = NULL;
 422         SLIST_INIT(&softc->immed_notify_slist);
 423         softc->state = TARGBH_STATE_NORMAL;
 424         periph->softc = softc;
 425         softc->init_level++;
 426
 427         return (targbhenlun(periph));
 428 }
 429
 430 static void
 431 targbhdtor(struct cam_periph *periph)
 432 {
 433         struct targbh_softc *softc;
 434
 435         softc = (struct targbh_softc *)periph->softc;
 436
 437         softc->state = TARGBH_STATE_TEARDOWN;
 438
 439         targbhdislun(periph);
 440
 441         switch (softc->init_level) {
 442         case 0:
 443                 panic("targdtor - impossible init level");;
 444         case 1:
 445                 /* FALLTHROUGH */
 446         default:
 447                 /* XXX Wait for callback of targbhdislun() */
 448                 tsleep(softc, PRIBIO, "targbh", hz/2);
 449                 free(softc, M_DEVBUF);
 450                 break;
 451         }
 452 }
 453
 454 static void
 455 targbhstart(struct cam_periph *periph, union ccb *start_ccb)
 456 {
 457         struct targbh_softc *softc;
 458         struct ccb_hdr *ccbh;
 459         struct ccb_accept_tio *atio;
 460         struct targbh_cmd_desc *desc;
 461         struct ccb_scsiio *csio;
 462         ccb_flags flags;
 463         int    s;
 464
 465         softc = (struct targbh_softc *)periph->softc;
 466
 467         s = splbio();
 468         ccbh = TAILQ_FIRST(&softc->work_queue);
 469         if (periph->immediate_priority <= periph->pinfo.priority) {
 470                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WAITING;
 471                 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
 472                                   periph_links.sle);
 473                 periph->immediate_priority = CAM_PRIORITY_NONE;
 474                 splx(s);
 475                 wakeup(&periph->ccb_list);
 476         } else if (ccbh == NULL) {
 477                 splx(s);
 478                 xpt_release_ccb(start_ccb);
 479         } else {
 480                 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe);
 481                 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh,
 482                                   periph_links.tqe);
 483                 splx(s);
 484                 atio = (struct ccb_accept_tio*)ccbh;
 485                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 486
 487                 /* Is this a tagged request? */
 488                 flags = atio->ccb_h.flags &
 489                     (CAM_DIS_DISCONNECT|CAM_TAG_ACTION_VALID|CAM_DIR_MASK);
 490
 491                 csio = &start_ccb->csio;
 492                 /*
 493                  * If we are done with the transaction, tell the
 494                  * controller to send status and perform a CMD_CMPLT.
 495                  * If we have associated sense data, see if we can
 496                  * send that too.
 497                  */
 498                 if (desc->data_resid == desc->data_increment) {
 499                         flags |= CAM_SEND_STATUS;
 500                         if (atio->sense_len) {
 501                                 csio->sense_len = atio->sense_len;
 502                                 csio->sense_data = atio->sense_data;
 503                                 flags |= CAM_SEND_SENSE;
 504                         }
 505
 506                 }
 507
 508                 cam_fill_ctio(csio,
 509                               /*retries*/2,
 510                               targbhdone,
 511                               flags,
 512                               (flags & CAM_TAG_ACTION_VALID)?
 513                                 MSG_SIMPLE_Q_TAG : 0,
 514                               atio->tag_id,
 515                               atio->init_id,
 516                               desc->status,
 517                               /*data_ptr*/desc->data_increment == 0
 518                                           ? NULL : desc->data,
 519                               /*dxfer_len*/desc->data_increment,
 520                               /*timeout*/desc->timeout);
 521
 522                 /* Override our wildcard attachment */
 523                 start_ccb->ccb_h.target_id = atio->ccb_h.target_id;
 524                 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun;
 525
 526                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ;
 527                 start_ccb->ccb_h.ccb_atio = atio;
 528                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 529                           ("Sending a CTIO\n"));
 530                 xpt_action(start_ccb);
 531                 /*
 532                  * If the queue was frozen waiting for the response
 533                  * to this ATIO (for instance disconnection was disallowed),
 534                  * then release it now that our response has been queued.
 535                  */
 536                 if ((atio->ccb_h.status & CAM_DEV_QFRZN) != 0) {
 537                         cam_release_devq(periph->path,
 538                                          /*relsim_flags*/0,
 539                                          /*reduction*/0,
 540                                          /*timeout*/0,
 541                                          /*getcount_only*/0);
 542                         atio->ccb_h.status &= ~CAM_DEV_QFRZN;
 543                 }
 544                 s = splbio();
 545                 ccbh = TAILQ_FIRST(&softc->work_queue);
 546                 splx(s);
 547         }
 548         if (ccbh != NULL)
 549                 xpt_schedule(periph, /*priority*/1);
 550 }
 551
 552 static void
 553 targbhdone(struct cam_periph *periph, union ccb *done_ccb)
 554 {
 555         struct targbh_softc *softc;
 556
 557         softc = (struct targbh_softc *)periph->softc;
 558
 559         if (done_ccb->ccb_h.ccb_type == TARGBH_CCB_WAITING) {
 560                 /* Caller will release the CCB */
 561                 wakeup(&done_ccb->ccb_h.cbfcnp);
 562                 return;
 563         }
 564
 565         switch (done_ccb->ccb_h.func_code) {
 566         case XPT_ACCEPT_TARGET_IO:
 567         {
 568                 struct ccb_accept_tio *atio;
 569                 struct targbh_cmd_desc *descr;
 570                 u_int8_t *cdb;
 571                 int priority;
 572
 573                 atio = &done_ccb->atio;
 574                 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr;
 575                 cdb = atio->cdb_io.cdb_bytes;
 576                 if (softc->state == TARGBH_STATE_TEARDOWN
 577                  || atio->ccb_h.status == CAM_REQ_ABORTED) {
 578                         targbhfreedescr(descr);
 579                         free(done_ccb, M_DEVBUF);
 580                         return;
 581                 }
 582
 583                 /*
 584                  * Determine the type of incoming command and
 585                  * setup our buffer for a response.
 586                  */
 587                 switch (cdb[0]) {
 588                 case INQUIRY:
 589                 {
 590                         struct scsi_inquiry *inq;
 591
 592                         inq = (struct scsi_inquiry *)cdb;
 593                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 594                                   ("Saw an inquiry!\n"));
 595                         /*
 596                          * Validate the command.  We don't
 597                          * support any VPD pages, so complain
 598                          * if EVPD is set.
 599                          */
 600                         if ((inq->byte2 & SI_EVPD) != 0
 601                          || inq->page_code != 0) {
 602                                 atio->ccb_h.flags &= ~CAM_DIR_MASK;
 603                                 atio->ccb_h.flags |= CAM_DIR_NONE;
 604                                 /*
 605                                  * This needs to have other than a
 606                                  * no_lun_sense_data response.
 607                                  */
 608                                 atio->sense_data = no_lun_sense_data;
 609                                 atio->sense_len = sizeof(no_lun_sense_data);
 610                                 descr->data_resid = 0;
 611                                 descr->data_increment = 0;
 612                                 descr->status = SCSI_STATUS_CHECK_COND;
 613                                 break;
 614                         }
 615                         /*
 616                          * Direction is always relative
 617                          * to the initator.
 618                          */
 619                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 620                         atio->ccb_h.flags |= CAM_DIR_IN;
 621                         descr->data = &no_lun_inq_data;
 622                         descr->data_resid = MIN(sizeof(no_lun_inq_data),
 623                                                 SCSI_CDB6_LEN(inq->length));
 624                         descr->data_increment = descr->data_resid;
 625                         descr->timeout = 5 * 1000;
 626                         descr->status = SCSI_STATUS_OK;
 627                         break;
 628                 }
 629                 case REQUEST_SENSE:
 630                 {
 631                         struct scsi_request_sense *rsense;
 632
 633                         rsense = (struct scsi_request_sense *)cdb;
 634                         /* Refer to static sense data */
 635                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 636                         atio->ccb_h.flags |= CAM_DIR_IN;
 637                         descr->data = &no_lun_sense_data;
 638                         descr->data_resid = request_sense_size;
 639                         descr->data_resid = MIN(descr->data_resid,
 640                                                 SCSI_CDB6_LEN(rsense->length));
 641                         descr->data_increment = descr->data_resid;
 642                         descr->timeout = 5 * 1000;
 643                         descr->status = SCSI_STATUS_OK;
 644                         break;
 645                 }
 646                 default:
 647                         /* Constant CA, tell initiator */
 648                         /* Direction is always relative to the initator */
 649                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 650                         atio->ccb_h.flags |= CAM_DIR_NONE;
 651                         atio->sense_data = no_lun_sense_data;
 652                         atio->sense_len = sizeof (no_lun_sense_data);
 653                         descr->data_resid = 0;
 654                         descr->data_increment = 0;
 655                         descr->timeout = 5 * 1000;
 656                         descr->status = SCSI_STATUS_CHECK_COND;
 657                         break;
 658                 }
 659
 660                 /* Queue us up to receive a Continue Target I/O ccb. */
 661                 if ((atio->ccb_h.flags & CAM_DIS_DISCONNECT) != 0) {
 662                         TAILQ_INSERT_HEAD(&softc->work_queue, &atio->ccb_h,
 663                                           periph_links.tqe);
 664                         priority = 0;
 665                 } else {
 666                         TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h,
 667                                           periph_links.tqe);
 668                         priority = 1;
 669                 }
 670                 xpt_schedule(periph, priority);
 671                 break;
 672         }
 673         case XPT_CONT_TARGET_IO:
 674         {
 675                 struct ccb_accept_tio *atio;
 676                 struct targbh_cmd_desc *desc;
 677
 678                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 679                           ("Received completed CTIO\n"));
 680                 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio;
 681                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 682
 683                 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h,
 684                              periph_links.tqe);
 685
 686                 /*
 687                  * We could check for CAM_SENT_SENSE bein set here,
 688                  * but since we're not maintaining any CA/UA state,
 689                  * there's no point.
 690                  */
 691                 atio->sense_len = 0;
 692                 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE;
 693                 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE;
 694
 695                 /*
 696                  * Any errors will not change the data we return,
 697                  * so make sure the queue is not left frozen.
 698                  * XXX - At some point there may be errors that
 699                  *       leave us in a connected state with the
 700                  *       initiator...
 701                  */
 702                 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
 703                         printf("Releasing Queue\n");
 704                         cam_release_devq(done_ccb->ccb_h.path,
 705                                          /*relsim_flags*/0,
 706                                          /*reduction*/0,
 707                                          /*timeout*/0,
 708                                          /*getcount_only*/0);
 709                         done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
 710                 }
 711                 desc->data_resid -= desc->data_increment;
 712                 xpt_release_ccb(done_ccb);
 713                 if (softc->state != TARGBH_STATE_TEARDOWN) {
 714
 715                         /*
 716                          * Send the original accept TIO back to the
 717                          * controller to handle more work.
 718                          */
 719                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 720                                   ("Returning ATIO to target\n"));
 721                         /* Restore wildcards */
 722                         atio->ccb_h.target_id = CAM_TARGET_WILDCARD;
 723                         atio->ccb_h.target_lun = CAM_LUN_WILDCARD;
 724                         xpt_action((union ccb *)atio);
 725                         break;
 726                 } else {
 727                         targbhfreedescr(desc);
 728                         free(atio, M_DEVBUF);
 729                 }
 730                 break;
 731         }
 732         case XPT_IMMED_NOTIFY:
 733         {
 734                 int frozen;
 735
 736                 frozen = (done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0;
 737                 if (softc->state == TARGBH_STATE_TEARDOWN
 738                  || done_ccb->ccb_h.status == CAM_REQ_ABORTED) {
 739                         printf("Freed an immediate notify\n");
 740                         free(done_ccb, M_DEVBUF);
 741                 } else {
 742                         /* Requeue for another immediate event */
 743                         xpt_action(done_ccb);
 744                 }
 745                 if (frozen != 0)
 746                         cam_release_devq(periph->path,
 747                                          /*relsim_flags*/0,
 748                                          /*opening reduction*/0,
 749                                          /*timeout*/0,
 750                                          /*getcount_only*/0);
 751                 break;
 752         }
 753         default:
 754                 panic("targbhdone: Unexpected ccb opcode");
 755                 break;
 756         }
 757 }
 758
 759 #ifdef NOTYET
 760 static int
 761 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
 762 {
 763         return 0;
 764 }
 765 #endif
 766
 767 static struct targbh_cmd_desc*
 768 targbhallocdescr()
 769 {
 770         struct targbh_cmd_desc* descr;
 771
 772         /* Allocate the targbh_descr structure */
 773         descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr),
 774                                                M_DEVBUF, M_NOWAIT);
 775         if (descr == NULL)
 776                 return (NULL);
 777
 778         bzero(descr, sizeof(*descr));
 779
 780         /* Allocate buffer backing store */
 781         descr->backing_store = malloc(MAX_BUF_SIZE, M_DEVBUF, M_NOWAIT);
 782         if (descr->backing_store == NULL) {
 783                 free(descr, M_DEVBUF);
 784                 return (NULL);
 785         }
 786         descr->max_size = MAX_BUF_SIZE;
 787         return (descr);
 788 }
 789
 790 static void
 791 targbhfreedescr(struct targbh_cmd_desc *descr)
 792 {
 793         free(descr->backing_store, M_DEVBUF);
 794         free(descr, M_DEVBUF);
 795 }