sys/bus/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  * $FreeBSD: src/sys/cam/scsi/scsi_targ_bh.c,v 1.4.2.5 2001/07/30 00:15:22 mjacob Exp $
  29  * $DragonFly: src/sys/bus/cam/scsi/scsi_targ_bh.c,v 1.2 2003/06/17 04:28:19 dillon Exp $
  30  */
  31 #include <sys/param.h>
  32 #include <sys/queue.h>
  33 #include <sys/systm.h>
  34 #include <sys/kernel.h>
  35 #include <sys/types.h>
  36 #include <sys/buf.h>
  37 #include <sys/conf.h>
  38 #include <sys/devicestat.h>
  39 #include <sys/malloc.h>
  40 #include <sys/uio.h>
  41
  42 #include <cam/cam.h>
  43 #include <cam/cam_ccb.h>
  44 #include <cam/cam_extend.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 #define MIN(a, b) ((a > b) ? b : a)
  74
  75 /* Offsets into our private CCB area for storing accept information */
  76 #define ccb_type        ppriv_field0
  77 #define ccb_descr       ppriv_ptr1
  78
  79 /* We stick a pointer to the originating accept TIO in each continue I/O CCB */
  80 #define ccb_atio        ppriv_ptr1
  81
  82 TAILQ_HEAD(ccb_queue, ccb_hdr);
  83
  84 struct targbh_softc {
  85         struct          ccb_queue pending_queue;
  86         struct          ccb_queue work_queue;
  87         struct          ccb_queue unknown_atio_queue;
  88         struct          devstat device_stats;
  89         targbh_state    state;
  90         targbh_flags    flags;
  91         u_int           init_level;
  92         u_int           inq_data_len;
  93         struct          ccb_accept_tio *accept_tio_list;
  94         struct          ccb_hdr_slist immed_notify_slist;
  95 };
  96
  97 struct targbh_cmd_desc {
  98         struct    ccb_accept_tio* atio_link;
  99         u_int     data_resid;   /* How much left to transfer */
 100         u_int     data_increment;/* Amount to send before next disconnect */
 101         void*     data;         /* The data. Can be from backing_store or not */
 102         void*     backing_store;/* Backing store allocated for this descriptor*/
 103         u_int     max_size;     /* Size of backing_store */
 104         u_int32_t timeout;
 105         u_int8_t  status;       /* Status to return to initiator */
 106 };
 107
 108 static struct scsi_inquiry_data no_lun_inq_data =
 109 {
 110         T_NODEVICE | (SID_QUAL_BAD_LU << 5), 0,
 111         /* version */2, /* format version */2
 112 };
 113
 114 static struct scsi_sense_data no_lun_sense_data =
 115 {
 116         SSD_CURRENT_ERROR|SSD_ERRCODE_VALID,
 117         0,
 118         SSD_KEY_NOT_READY,
 119         { 0, 0, 0, 0 },
 120         /*extra_len*/offsetof(struct scsi_sense_data, fru)
 121                    - offsetof(struct scsi_sense_data, extra_len),
 122         { 0, 0, 0, 0 },
 123         /* Logical Unit Not Supported */
 124         /*ASC*/0x25, /*ASCQ*/0
 125 };
 126
 127 static const int request_sense_size = offsetof(struct scsi_sense_data, fru);
 128
 129 static periph_init_t    targbhinit;
 130 static void             targbhasync(void *callback_arg, u_int32_t code,
 131                                     struct cam_path *path, void *arg);
 132 static cam_status       targbhenlun(struct cam_periph *periph);
 133 static cam_status       targbhdislun(struct cam_periph *periph);
 134 static periph_ctor_t    targbhctor;
 135 static periph_dtor_t    targbhdtor;
 136 static periph_start_t   targbhstart;
 137 static void             targbhdone(struct cam_periph *periph,
 138                                    union ccb *done_ccb);
 139 #ifdef NOTYET
 140 static  int             targbherror(union ccb *ccb, u_int32_t cam_flags,
 141                                     u_int32_t sense_flags);
 142 #endif
 143 static struct targbh_cmd_desc*  targbhallocdescr(void);
 144 static void             targbhfreedescr(struct targbh_cmd_desc *buf);
 145
 146 static struct periph_driver targbhdriver =
 147 {
 148         targbhinit, "targbh",
 149         TAILQ_HEAD_INITIALIZER(targbhdriver.units), /* generation */ 0
 150 };
 151
 152 DATA_SET(periphdriver_set, targbhdriver);
 153
 154 static void
 155 targbhinit(void)
 156 {
 157         cam_status status;
 158         struct cam_path *path;
 159
 160         /*
 161          * Install a global async callback.  This callback will
 162          * receive async callbacks like "new path registered".
 163          */
 164         status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
 165                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
 166
 167         if (status == CAM_REQ_CMP) {
 168                 struct ccb_setasync csa;
 169
 170                 xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5);
 171                 csa.ccb_h.func_code = XPT_SASYNC_CB;
 172                 csa.event_enable = AC_PATH_REGISTERED;
 173                 csa.callback = targbhasync;
 174                 csa.callback_arg = NULL;
 175                 xpt_action((union ccb *)&csa);
 176                 status = csa.ccb_h.status;
 177                 xpt_free_path(path);
 178         }
 179
 180         if (status != CAM_REQ_CMP) {
 181                 printf("targbh: Failed to attach master async callback "
 182                        "due to status 0x%x!\n", status);
 183         }
 184 }
 185
 186 static void
 187 targbhasync(void *callback_arg, u_int32_t code,
 188             struct cam_path *path, void *arg)
 189 {
 190         struct cam_periph *periph;
 191
 192         periph = (struct cam_periph *)callback_arg;
 193         switch (code) {
 194         case AC_PATH_REGISTERED:
 195         {
 196                 struct ccb_pathinq *cpi;
 197                 struct cam_path *new_path;
 198                 cam_status status;
 199
 200                 cpi = (struct ccb_pathinq *)arg;
 201
 202                 /* Only attach to controllers that support target mode */
 203                 if ((cpi->target_sprt & PIT_PROCESSOR) == 0)
 204                         break;
 205
 206                 /*
 207                  * Allocate a peripheral instance for
 208                  * this target instance.
 209                  */
 210                 status = xpt_create_path(&new_path, NULL,
 211                                          xpt_path_path_id(path),
 212                                          CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
 213                 if (status != CAM_REQ_CMP) {
 214                         printf("targbhasync: Unable to create path "
 215                                 "due to status 0x%x\n", status);
 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                 xpt_free_path(new_path);
 225                 if (status != CAM_REQ_CMP
 226                  && status != CAM_REQ_INPROG)
 227                         printf("targbhasync: Unable to allocate new periph "
 228                                "due to status 0x%x\n", status);
 229                 break;
 230         }
 231         case AC_PATH_DEREGISTERED:
 232         {
 233                 targbhdislun(periph);
 234                 break;
 235         }
 236         default:
 237                 break;
 238         }
 239 }
 240
 241 /* Attempt to enable our lun */
 242 static cam_status
 243 targbhenlun(struct cam_periph *periph)
 244 {
 245         union ccb immed_ccb;
 246         struct targbh_softc *softc;
 247         cam_status status;
 248         int i;
 249
 250         softc = (struct targbh_softc *)periph->softc;
 251
 252         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0)
 253                 return (CAM_REQ_CMP);
 254
 255         xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, /*priority*/1);
 256         immed_ccb.ccb_h.func_code = XPT_EN_LUN;
 257
 258         /* Don't need support for any vendor specific commands */
 259         immed_ccb.cel.grp6_len = 0;
 260         immed_ccb.cel.grp7_len = 0;
 261         immed_ccb.cel.enable = 1;
 262         xpt_action(&immed_ccb);
 263         status = immed_ccb.ccb_h.status;
 264         if (status != CAM_REQ_CMP) {
 265                 xpt_print_path(periph->path);
 266                 printf("targbhenlun - Enable Lun Rejected with status 0x%x\n",
 267                        status);
 268                 return (status);
 269         }
 270
 271         softc->flags |= TARGBH_FLAG_LUN_ENABLED;
 272
 273         /*
 274          * Build up a buffer of accept target I/O
 275          * operations for incoming selections.
 276          */
 277         for (i = 0; i < MAX_ACCEPT; i++) {
 278                 struct ccb_accept_tio *atio;
 279
 280                 atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_DEVBUF,
 281                                                       M_NOWAIT);
 282                 if (atio == NULL) {
 283                         status = CAM_RESRC_UNAVAIL;
 284                         break;
 285                 }
 286
 287                 atio->ccb_h.ccb_descr = targbhallocdescr();
 288
 289                 if (atio->ccb_h.ccb_descr == NULL) {
 290                         free(atio, M_DEVBUF);
 291                         status = CAM_RESRC_UNAVAIL;
 292                         break;
 293                 }
 294
 295                 xpt_setup_ccb(&atio->ccb_h, periph->path, /*priority*/1);
 296                 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO;
 297                 atio->ccb_h.cbfcnp = targbhdone;
 298                 xpt_action((union ccb *)atio);
 299                 status = atio->ccb_h.status;
 300                 if (status != CAM_REQ_INPROG) {
 301                         targbhfreedescr(atio->ccb_h.ccb_descr);
 302                         free(atio, M_DEVBUF);
 303                         break;
 304                 }
 305                 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link =
 306                     softc->accept_tio_list;
 307                 softc->accept_tio_list = atio;
 308         }
 309
 310         if (i == 0) {
 311                 xpt_print_path(periph->path);
 312                 printf("targbhenlun - Could not allocate accept tio CCBs: "
 313                        "status = 0x%x\n", status);
 314                 targbhdislun(periph);
 315                 return (CAM_REQ_CMP_ERR);
 316         }
 317
 318         /*
 319          * Build up a buffer of immediate notify CCBs
 320          * so the SIM can tell us of asynchronous target mode events.
 321          */
 322         for (i = 0; i < MAX_ACCEPT; i++) {
 323                 struct ccb_immed_notify *inot;
 324
 325                 inot = (struct ccb_immed_notify*)malloc(sizeof(*inot), M_DEVBUF,
 326                                                         M_NOWAIT);
 327
 328                 if (inot == NULL) {
 329                         status = CAM_RESRC_UNAVAIL;
 330                         break;
 331                 }
 332
 333                 xpt_setup_ccb(&inot->ccb_h, periph->path, /*priority*/1);
 334                 inot->ccb_h.func_code = XPT_IMMED_NOTIFY;
 335                 inot->ccb_h.cbfcnp = targbhdone;
 336                 xpt_action((union ccb *)inot);
 337                 status = inot->ccb_h.status;
 338                 if (status != CAM_REQ_INPROG) {
 339                         free(inot, M_DEVBUF);
 340                         break;
 341                 }
 342                 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h,
 343                                   periph_links.sle);
 344         }
 345
 346         if (i == 0) {
 347                 xpt_print_path(periph->path);
 348                 printf("targbhenlun - Could not allocate immediate notify "
 349                        "CCBs: status = 0x%x\n", status);
 350                 targbhdislun(periph);
 351                 return (CAM_REQ_CMP_ERR);
 352         }
 353
 354         return (CAM_REQ_CMP);
 355 }
 356
 357 static cam_status
 358 targbhdislun(struct cam_periph *periph)
 359 {
 360         union ccb ccb;
 361         struct targbh_softc *softc;
 362         struct ccb_accept_tio* atio;
 363         struct ccb_hdr *ccb_h;
 364
 365         softc = (struct targbh_softc *)periph->softc;
 366         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0)
 367                 return CAM_REQ_CMP;
 368
 369         /* XXX Block for Continue I/O completion */
 370
 371         /* Kill off all ACCECPT and IMMEDIATE CCBs */
 372         while ((atio = softc->accept_tio_list) != NULL) {
 373
 374                 softc->accept_tio_list =
 375                     ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link;
 376                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1);
 377                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 378                 ccb.cab.abort_ccb = (union ccb *)atio;
 379                 xpt_action(&ccb);
 380         }
 381
 382         while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) {
 383                 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle);
 384                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1);
 385                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 386                 ccb.cab.abort_ccb = (union ccb *)ccb_h;
 387                 xpt_action(&ccb);
 388         }
 389
 390         /*
 391          * Dissable this lun.
 392          */
 393         xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, /*priority*/1);
 394         ccb.cel.ccb_h.func_code = XPT_EN_LUN;
 395         ccb.cel.enable = 0;
 396         xpt_action(&ccb);
 397
 398         if (ccb.cel.ccb_h.status != CAM_REQ_CMP)
 399                 printf("targbhdislun - Disabling lun on controller failed "
 400                        "with status 0x%x\n", ccb.cel.ccb_h.status);
 401         else
 402                 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED;
 403         return (ccb.cel.ccb_h.status);
 404 }
 405
 406 static cam_status
 407 targbhctor(struct cam_periph *periph, void *arg)
 408 {
 409         struct ccb_pathinq *cpi;
 410         struct targbh_softc *softc;
 411
 412         cpi = (struct ccb_pathinq *)arg;
 413
 414         /* Allocate our per-instance private storage */
 415         softc = (struct targbh_softc *)malloc(sizeof(*softc),
 416                                               M_DEVBUF, M_NOWAIT);
 417         if (softc == NULL) {
 418                 printf("targctor: unable to malloc softc\n");
 419                 return (CAM_REQ_CMP_ERR);
 420         }
 421
 422         bzero(softc, sizeof(*softc));
 423         TAILQ_INIT(&softc->pending_queue);
 424         TAILQ_INIT(&softc->work_queue);
 425         softc->accept_tio_list = NULL;
 426         SLIST_INIT(&softc->immed_notify_slist);
 427         softc->state = TARGBH_STATE_NORMAL;
 428         periph->softc = softc;
 429         softc->init_level++;
 430
 431         return (targbhenlun(periph));
 432 }
 433
 434 static void
 435 targbhdtor(struct cam_periph *periph)
 436 {
 437         struct targbh_softc *softc;
 438
 439         softc = (struct targbh_softc *)periph->softc;
 440
 441         softc->state = TARGBH_STATE_TEARDOWN;
 442
 443         targbhdislun(periph);
 444
 445         switch (softc->init_level) {
 446         default:
 447                 /* FALLTHROUGH */
 448         case 1:
 449                 free(softc, M_DEVBUF);
 450                 break;
 451         case 0:
 452                 panic("targdtor - impossible init level");;
 453         }
 454 }
 455
 456 static void
 457 targbhstart(struct cam_periph *periph, union ccb *start_ccb)
 458 {
 459         struct targbh_softc *softc;
 460         struct ccb_hdr *ccbh;
 461         struct ccb_accept_tio *atio;
 462         struct targbh_cmd_desc *desc;
 463         struct ccb_scsiio *csio;
 464         ccb_flags flags;
 465         int    s;
 466
 467         softc = (struct targbh_softc *)periph->softc;
 468
 469         s = splbio();
 470         ccbh = TAILQ_FIRST(&softc->work_queue);
 471         if (periph->immediate_priority <= periph->pinfo.priority) {
 472                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WAITING;
 473                 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
 474                                   periph_links.sle);
 475                 periph->immediate_priority = CAM_PRIORITY_NONE;
 476                 splx(s);
 477                 wakeup(&periph->ccb_list);
 478         } else if (ccbh == NULL) {
 479                 splx(s);
 480                 xpt_release_ccb(start_ccb);
 481         } else {
 482                 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe);
 483                 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh,
 484                                   periph_links.tqe);
 485                 splx(s);
 486                 atio = (struct ccb_accept_tio*)ccbh;
 487                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 488
 489                 /* Is this a tagged request? */
 490                 flags = atio->ccb_h.flags & (CAM_TAG_ACTION_VALID|CAM_DIR_MASK);
 491
 492                 csio = &start_ccb->csio;
 493                 /*
 494                  * If we are done with the transaction, tell the
 495                  * controller to send status and perform a CMD_CMPLT.
 496                  * If we have associated sense data, see if we can
 497                  * send that too.
 498                  */
 499                 if (desc->data_resid == desc->data_increment) {
 500                         flags |= CAM_SEND_STATUS;
 501                         if (atio->sense_len) {
 502                                 csio->sense_len = atio->sense_len;
 503                                 csio->sense_data = atio->sense_data;
 504                                 flags |= CAM_SEND_SENSE;
 505                         }
 506
 507                 }
 508
 509                 cam_fill_ctio(csio,
 510                               /*retries*/2,
 511                               targbhdone,
 512                               flags,
 513                               (flags & CAM_TAG_ACTION_VALID)?
 514                                 MSG_SIMPLE_Q_TAG : 0,
 515                               atio->tag_id,
 516                               atio->init_id,
 517                               desc->status,
 518                               /*data_ptr*/desc->data_increment == 0
 519                                           ? NULL : desc->data,
 520                               /*dxfer_len*/desc->data_increment,
 521                               /*timeout*/desc->timeout);
 522
 523                 /* Override our wildcard attachment */
 524                 start_ccb->ccb_h.target_id = atio->ccb_h.target_id;
 525                 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun;
 526
 527                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ;
 528                 start_ccb->ccb_h.ccb_atio = atio;
 529                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 530                           ("Sending a CTIO\n"));
 531                 xpt_action(start_ccb);
 532                 s = splbio();
 533                 ccbh = TAILQ_FIRST(&softc->work_queue);
 534                 splx(s);
 535         }
 536         if (ccbh != NULL)
 537                 xpt_schedule(periph, /*priority*/1);
 538 }
 539
 540 static void
 541 targbhdone(struct cam_periph *periph, union ccb *done_ccb)
 542 {
 543         struct targbh_softc *softc;
 544
 545         softc = (struct targbh_softc *)periph->softc;
 546
 547         if (done_ccb->ccb_h.ccb_type == TARGBH_CCB_WAITING) {
 548                 /* Caller will release the CCB */
 549                 wakeup(&done_ccb->ccb_h.cbfcnp);
 550                 return;
 551         }
 552
 553         switch (done_ccb->ccb_h.func_code) {
 554         case XPT_ACCEPT_TARGET_IO:
 555         {
 556                 struct ccb_accept_tio *atio;
 557                 struct targbh_cmd_desc *descr;
 558                 u_int8_t *cdb;
 559
 560                 atio = &done_ccb->atio;
 561                 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr;
 562                 cdb = atio->cdb_io.cdb_bytes;
 563                 if (softc->state == TARGBH_STATE_TEARDOWN
 564                  || atio->ccb_h.status == CAM_REQ_ABORTED) {
 565                         targbhfreedescr(descr);
 566                         free(done_ccb, M_DEVBUF);
 567                         return;
 568                 }
 569
 570                 /*
 571                  * Determine the type of incoming command and
 572                  * setup our buffer for a response.
 573                  */
 574                 switch (cdb[0]) {
 575                 case INQUIRY:
 576                 {
 577                         struct scsi_inquiry *inq;
 578
 579                         inq = (struct scsi_inquiry *)cdb;
 580                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 581                                   ("Saw an inquiry!\n"));
 582                         /*
 583                          * Validate the command.  We don't
 584                          * support any VPD pages, so complain
 585                          * if EVPD is set.
 586                          */
 587                         if ((inq->byte2 & SI_EVPD) != 0
 588                          || inq->page_code != 0) {
 589                                 atio->ccb_h.flags &= ~CAM_DIR_MASK;
 590                                 atio->ccb_h.flags |= CAM_DIR_NONE;
 591                                 /*
 592                                  * This needs to have other than a
 593                                  * no_lun_sense_data response.
 594                                  */
 595                                 atio->sense_data = no_lun_sense_data;
 596                                 atio->sense_len = sizeof(no_lun_sense_data);
 597                                 descr->data_resid = 0;
 598                                 descr->data_increment = 0;
 599                                 descr->status = SCSI_STATUS_CHECK_COND;
 600                                 break;
 601                         }
 602                         /*
 603                          * Direction is always relative
 604                          * to the initator.
 605                          */
 606                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 607                         atio->ccb_h.flags |= CAM_DIR_IN;
 608                         descr->data = &no_lun_inq_data;
 609                         descr->data_resid = MIN(sizeof(no_lun_inq_data),
 610                                                 SCSI_CDB6_LEN(inq->length));
 611                         descr->data_increment = descr->data_resid;
 612                         descr->timeout = 5 * 1000;
 613                         descr->status = SCSI_STATUS_OK;
 614                         break;
 615                 }
 616                 case REQUEST_SENSE:
 617                 {
 618                         struct scsi_request_sense *rsense;
 619
 620                         rsense = (struct scsi_request_sense *)cdb;
 621                         /* Refer to static sense data */
 622                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 623                         atio->ccb_h.flags |= CAM_DIR_IN;
 624                         descr->data = &no_lun_sense_data;
 625                         descr->data_resid = request_sense_size;
 626                         descr->data_resid = MIN(descr->data_resid,
 627                                                 SCSI_CDB6_LEN(rsense->length));
 628                         descr->data_increment = descr->data_resid;
 629                         descr->timeout = 5 * 1000;
 630                         descr->status = SCSI_STATUS_OK;
 631                         break;
 632                 }
 633                 default:
 634                         /* Constant CA, tell initiator */
 635                         /* Direction is always relative to the initator */
 636                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 637                         atio->ccb_h.flags |= CAM_DIR_NONE;
 638                         atio->sense_data = no_lun_sense_data;
 639                         atio->sense_len = sizeof (no_lun_sense_data);
 640                         descr->data_resid = 0;
 641                         descr->data_increment = 0;
 642                         descr->timeout = 5 * 1000;
 643                         descr->status = SCSI_STATUS_CHECK_COND;
 644                         break;
 645                 }
 646
 647                 /* Queue us up to receive a Continue Target I/O ccb. */
 648                 TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h,
 649                                   periph_links.tqe);
 650                 xpt_schedule(periph, /*priority*/1);
 651                 break;
 652         }
 653         case XPT_CONT_TARGET_IO:
 654         {
 655                 struct ccb_accept_tio *atio;
 656                 struct targbh_cmd_desc *desc;
 657
 658                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 659                           ("Received completed CTIO\n"));
 660                 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio;
 661                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 662
 663                 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h,
 664                              periph_links.tqe);
 665
 666                 /*
 667                  * We could check for CAM_SENT_SENSE bein set here,
 668                  * but since we're not maintaining any CA/UA state,
 669                  * there's no point.
 670                  */
 671                 atio->sense_len = 0;
 672                 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE;
 673                 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE;
 674
 675                 /* XXX Check for errors */
 676                 desc->data_resid -= desc->data_increment;
 677                 xpt_release_ccb(done_ccb);
 678                 if (softc->state != TARGBH_STATE_TEARDOWN) {
 679
 680                         /*
 681                          * Send the original accept TIO back to the
 682                          * controller to handle more work.
 683                          */
 684                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 685                                   ("Returning ATIO to target\n"));
 686                         /* Restore wildcards */
 687                         atio->ccb_h.target_id = CAM_TARGET_WILDCARD;
 688                         atio->ccb_h.target_lun = CAM_LUN_WILDCARD;
 689                         xpt_action((union ccb *)atio);
 690                         break;
 691                 } else {
 692                         targbhfreedescr(desc);
 693                         free(atio, M_DEVBUF);
 694                 }
 695                 break;
 696         }
 697         case XPT_IMMED_NOTIFY:
 698         {
 699                 if (softc->state == TARGBH_STATE_TEARDOWN
 700                  || done_ccb->ccb_h.status == CAM_REQ_ABORTED) {
 701                         printf("Freed an immediate notify\n");
 702                         free(done_ccb, M_DEVBUF);
 703                 }
 704                 break;
 705         }
 706         default:
 707                 panic("targbhdone: Unexpected ccb opcode");
 708                 break;
 709         }
 710 }
 711
 712 #ifdef NOTYET
 713 static int
 714 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
 715 {
 716         return 0;
 717 }
 718 #endif
 719
 720 static struct targbh_cmd_desc*
 721 targbhallocdescr()
 722 {
 723         struct targbh_cmd_desc* descr;
 724
 725         /* Allocate the targbh_descr structure */
 726         descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr),
 727                                                M_DEVBUF, M_NOWAIT);
 728         if (descr == NULL)
 729                 return (NULL);
 730
 731         bzero(descr, sizeof(*descr));
 732
 733         /* Allocate buffer backing store */
 734         descr->backing_store = malloc(MAX_BUF_SIZE, M_DEVBUF, M_NOWAIT);
 735         if (descr->backing_store == NULL) {
 736                 free(descr, M_DEVBUF);
 737                 return (NULL);
 738         }
 739         descr->max_size = MAX_BUF_SIZE;
 740         return (descr);
 741 }
 742
 743 static void
 744 targbhfreedescr(struct targbh_cmd_desc *descr)
 745 {
 746         free(descr->backing_store, M_DEVBUF);
 747         free(descr, M_DEVBUF);
 748 }