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 #include <cam/cam_sim.h>
  50
  51 #include <cam/scsi/scsi_all.h>
  52 #include <cam/scsi/scsi_message.h>
  53
  54 static MALLOC_DEFINE(M_SCSIBH, "SCSI bh", "SCSI blackhole buffers");
  55
  56 typedef enum {
  57         TARGBH_STATE_NORMAL,
  58         TARGBH_STATE_EXCEPTION,
  59         TARGBH_STATE_TEARDOWN
  60 } targbh_state;
  61
  62 typedef enum {
  63         TARGBH_FLAG_NONE         = 0x00,
  64         TARGBH_FLAG_LUN_ENABLED  = 0x01
  65 } targbh_flags;
  66
  67 typedef enum {
  68         TARGBH_CCB_WORKQ,
  69         TARGBH_CCB_WAITING
  70 } targbh_ccb_types;
  71
  72 #define MAX_ACCEPT      8
  73 #define MAX_IMMEDIATE   16
  74 #define MAX_BUF_SIZE    256     /* Max inquiry/sense/mode page transfer */
  75
  76 /* Offsets into our private CCB area for storing accept information */
  77 #define ccb_type        ppriv_field0
  78 #define ccb_descr       ppriv_ptr1
  79
  80 /* We stick a pointer to the originating accept TIO in each continue I/O CCB */
  81 #define ccb_atio        ppriv_ptr1
  82
  83 TAILQ_HEAD(ccb_queue, ccb_hdr);
  84
  85 struct targbh_softc {
  86         struct          ccb_queue pending_queue;
  87         struct          ccb_queue work_queue;
  88         struct          ccb_queue unknown_atio_queue;
  89         struct          devstat device_stats;
  90         targbh_state    state;
  91         targbh_flags    flags;
  92         u_int           init_level;
  93         u_int           inq_data_len;
  94         struct          ccb_accept_tio *accept_tio_list;
  95         struct          ccb_hdr_slist immed_notify_slist;
  96 };
  97
  98 struct targbh_cmd_desc {
  99         struct    ccb_accept_tio* atio_link;
 100         u_int     data_resid;   /* How much left to transfer */
 101         u_int     data_increment;/* Amount to send before next disconnect */
 102         void*     data;         /* The data. Can be from backing_store or not */
 103         void*     backing_store;/* Backing store allocated for this descriptor*/
 104         u_int     max_size;     /* Size of backing_store */
 105         u_int32_t timeout;
 106         u_int8_t  status;       /* Status to return to initiator */
 107 };
 108
 109 static struct scsi_inquiry_data no_lun_inq_data =
 110 {
 111         T_NODEVICE | (SID_QUAL_BAD_LU << 5), 0,
 112         /* version */2, /* format version */2
 113 };
 114
 115 static struct scsi_sense_data_fixed no_lun_sense_data =
 116 {
 117         SSD_CURRENT_ERROR|SSD_ERRCODE_VALID,
 118         0,
 119         SSD_KEY_NOT_READY,
 120         { 0, 0, 0, 0 },
 121         /*extra_len*/offsetof(struct scsi_sense_data_fixed, fru)
 122                    - offsetof(struct scsi_sense_data_fixed, extra_len),
 123         { 0, 0, 0, 0 },
 124         /* Logical Unit Not Supported */
 125         /*ASC*/0x25, /*ASCQ*/0
 126 };
 127
 128 static const int request_sense_size = offsetof(struct scsi_sense_data_fixed, fru);
 129
 130 static periph_init_t    targbhinit;
 131 static void             targbhasync(void *callback_arg, u_int32_t code,
 132                                     struct cam_path *path, void *arg);
 133 static cam_status       targbhenlun(struct cam_periph *periph);
 134 static cam_status       targbhdislun(struct cam_periph *periph);
 135 static periph_ctor_t    targbhctor;
 136 static periph_dtor_t    targbhdtor;
 137 static periph_start_t   targbhstart;
 138 static void             targbhdone(struct cam_periph *periph,
 139                                    union ccb *done_ccb);
 140 #ifdef NOTYET
 141 static  int             targbherror(union ccb *ccb, u_int32_t cam_flags,
 142                                     u_int32_t sense_flags);
 143 #endif
 144 static struct targbh_cmd_desc*  targbhallocdescr(void);
 145 static void             targbhfreedescr(struct targbh_cmd_desc *buf);
 146
 147 static struct periph_driver targbhdriver =
 148 {
 149         targbhinit, "targbh",
 150         TAILQ_HEAD_INITIALIZER(targbhdriver.units), /* generation */ 0
 151 };
 152
 153 PERIPHDRIVER_DECLARE(targbh, targbhdriver);
 154
 155 static void
 156 targbhinit(void)
 157 {
 158         cam_status status;
 159
 160         /*
 161          * Install a global async callback.  This callback will
 162          * receive async callbacks like "new path registered".
 163          */
 164         status = xpt_register_async(AC_PATH_REGISTERED | AC_PATH_DEREGISTERED,
 165                                     targbhasync, NULL, NULL);
 166
 167         if (status != CAM_REQ_CMP) {
 168                 printf("targbh: Failed to attach master async callback "
 169                        "due to status 0x%x!\n", status);
 170         }
 171 }
 172
 173 static void
 174 targbhasync(void *callback_arg, u_int32_t code,
 175             struct cam_path *path, void *arg)
 176 {
 177         struct cam_path *new_path;
 178         struct ccb_pathinq *cpi;
 179         path_id_t bus_path_id;
 180         cam_status status;
 181
 182         cpi = (struct ccb_pathinq *)arg;
 183         if (code == AC_PATH_REGISTERED)
 184                 bus_path_id = cpi->ccb_h.path_id;
 185         else
 186                 bus_path_id = xpt_path_path_id(path);
 187         /*
 188          * Allocate a peripheral instance for
 189          * this target instance.
 190          */
 191         status = xpt_create_path(&new_path, NULL,
 192                                  bus_path_id,
 193                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
 194         if (status != CAM_REQ_CMP) {
 195                 printf("targbhasync: Unable to create path "
 196                         "due to status 0x%x\n", status);
 197                 return;
 198         }
 199
 200         switch (code) {
 201         case AC_PATH_REGISTERED:
 202         {
 203                 /* Only attach to controllers that support target mode */
 204                 if ((cpi->target_sprt & PIT_PROCESSOR) == 0)
 205                         break;
 206
 207                 status = cam_periph_alloc(targbhctor, NULL, targbhdtor,
 208                                           targbhstart,
 209                                           "targbh", CAM_PERIPH_BIO,
 210                                           new_path, targbhasync,
 211                                           AC_PATH_REGISTERED,
 212                                           cpi);
 213                 break;
 214         }
 215         case AC_PATH_DEREGISTERED:
 216         {
 217                 struct cam_periph *periph;
 218
 219                 if ((periph = cam_periph_find(new_path, "targbh")) != NULL)
 220                         cam_periph_invalidate(periph);
 221                 break;
 222         }
 223         default:
 224                 break;
 225         }
 226         xpt_free_path(new_path);
 227 }
 228
 229 /* Attempt to enable our lun */
 230 static cam_status
 231 targbhenlun(struct cam_periph *periph)
 232 {
 233         union ccb immed_ccb;
 234         struct targbh_softc *softc;
 235         cam_status status;
 236         int i;
 237
 238         softc = (struct targbh_softc *)periph->softc;
 239
 240         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0)
 241                 return (CAM_REQ_CMP);
 242
 243         xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 244         immed_ccb.ccb_h.func_code = XPT_EN_LUN;
 245
 246         /* Don't need support for any vendor specific commands */
 247         immed_ccb.cel.grp6_len = 0;
 248         immed_ccb.cel.grp7_len = 0;
 249         immed_ccb.cel.enable = 1;
 250         xpt_action(&immed_ccb);
 251         status = immed_ccb.ccb_h.status;
 252         if (status != CAM_REQ_CMP) {
 253                 xpt_print(periph->path,
 254                     "targbhenlun - Enable Lun Rejected with status 0x%x\n",
 255                     status);
 256                 return (status);
 257         }
 258
 259         softc->flags |= TARGBH_FLAG_LUN_ENABLED;
 260
 261         /*
 262          * Build up a buffer of accept target I/O
 263          * operations for incoming selections.
 264          */
 265         for (i = 0; i < MAX_ACCEPT; i++) {
 266                 struct ccb_accept_tio *atio;
 267
 268                 atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_SCSIBH,
 269                                                       M_NOWAIT);
 270                 if (atio == NULL) {
 271                         status = CAM_RESRC_UNAVAIL;
 272                         break;
 273                 }
 274
 275                 atio->ccb_h.ccb_descr = targbhallocdescr();
 276
 277                 if (atio->ccb_h.ccb_descr == NULL) {
 278                         free(atio, M_SCSIBH);
 279                         status = CAM_RESRC_UNAVAIL;
 280                         break;
 281                 }
 282
 283                 xpt_setup_ccb(&atio->ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 284                 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO;
 285                 atio->ccb_h.cbfcnp = targbhdone;
 286                 xpt_action((union ccb *)atio);
 287                 status = atio->ccb_h.status;
 288                 if (status != CAM_REQ_INPROG) {
 289                         targbhfreedescr(atio->ccb_h.ccb_descr);
 290                         free(atio, M_SCSIBH);
 291                         break;
 292                 }
 293                 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link =
 294                     softc->accept_tio_list;
 295                 softc->accept_tio_list = atio;
 296         }
 297
 298         if (i == 0) {
 299                 xpt_print(periph->path,
 300                     "targbhenlun - Could not allocate accept tio CCBs: status "
 301                     "= 0x%x\n", status);
 302                 targbhdislun(periph);
 303                 return (CAM_REQ_CMP_ERR);
 304         }
 305
 306         /*
 307          * Build up a buffer of immediate notify CCBs
 308          * so the SIM can tell us of asynchronous target mode events.
 309          */
 310         for (i = 0; i < MAX_ACCEPT; i++) {
 311                 struct ccb_immed_notify *inot;
 312
 313                 inot = (struct ccb_immed_notify*)malloc(sizeof(*inot), M_SCSIBH,
 314                                                         M_NOWAIT);
 315
 316                 if (inot == NULL) {
 317                         status = CAM_RESRC_UNAVAIL;
 318                         break;
 319                 }
 320
 321                 xpt_setup_ccb(&inot->ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 322                 inot->ccb_h.func_code = XPT_IMMED_NOTIFY;
 323                 inot->ccb_h.cbfcnp = targbhdone;
 324                 xpt_action((union ccb *)inot);
 325                 status = inot->ccb_h.status;
 326                 if (status != CAM_REQ_INPROG) {
 327                         free(inot, M_SCSIBH);
 328                         break;
 329                 }
 330                 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h,
 331                                   periph_links.sle);
 332         }
 333
 334         if (i == 0) {
 335                 xpt_print(periph->path,
 336                     "targbhenlun - Could not allocate immediate notify "
 337                     "CCBs: status = 0x%x\n", status);
 338                 targbhdislun(periph);
 339                 return (CAM_REQ_CMP_ERR);
 340         }
 341
 342         return (CAM_REQ_CMP);
 343 }
 344
 345 static cam_status
 346 targbhdislun(struct cam_periph *periph)
 347 {
 348         union ccb ccb;
 349         struct targbh_softc *softc;
 350         struct ccb_accept_tio* atio;
 351         struct ccb_hdr *ccb_h;
 352
 353         softc = (struct targbh_softc *)periph->softc;
 354         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0)
 355                 return CAM_REQ_CMP;
 356
 357         /* XXX Block for Continue I/O completion */
 358
 359         /* Kill off all ACCECPT and IMMEDIATE CCBs */
 360         while ((atio = softc->accept_tio_list) != NULL) {
 361
 362                 softc->accept_tio_list =
 363                     ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link;
 364                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 365                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 366                 ccb.cab.abort_ccb = (union ccb *)atio;
 367                 xpt_action(&ccb);
 368         }
 369
 370         while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) {
 371                 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle);
 372                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 373                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 374                 ccb.cab.abort_ccb = (union ccb *)ccb_h;
 375                 xpt_action(&ccb);
 376         }
 377
 378         /*
 379          * Dissable this lun.
 380          */
 381         xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 382         ccb.cel.ccb_h.func_code = XPT_EN_LUN;
 383         ccb.cel.enable = 0;
 384         xpt_action(&ccb);
 385
 386         if (ccb.cel.ccb_h.status != CAM_REQ_CMP)
 387                 printf("targbhdislun - Disabling lun on controller failed "
 388                        "with status 0x%x\n", ccb.cel.ccb_h.status);
 389         else
 390                 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED;
 391         return (ccb.cel.ccb_h.status);
 392 }
 393
 394 static cam_status
 395 targbhctor(struct cam_periph *periph, void *arg)
 396 {
 397         struct targbh_softc *softc;
 398
 399         /* Allocate our per-instance private storage */
 400         softc = (struct targbh_softc *)malloc(sizeof(*softc),
 401                                               M_SCSIBH, M_NOWAIT);
 402         if (softc == NULL) {
 403                 printf("targctor: unable to malloc softc\n");
 404                 return (CAM_REQ_CMP_ERR);
 405         }
 406
 407         bzero(softc, sizeof(*softc));
 408         TAILQ_INIT(&softc->pending_queue);
 409         TAILQ_INIT(&softc->work_queue);
 410         softc->accept_tio_list = NULL;
 411         SLIST_INIT(&softc->immed_notify_slist);
 412         softc->state = TARGBH_STATE_NORMAL;
 413         periph->softc = softc;
 414         softc->init_level++;
 415
 416         return (targbhenlun(periph));
 417 }
 418
 419 static void
 420 targbhdtor(struct cam_periph *periph)
 421 {
 422         struct targbh_softc *softc;
 423
 424         softc = (struct targbh_softc *)periph->softc;
 425
 426         softc->state = TARGBH_STATE_TEARDOWN;
 427
 428         targbhdislun(periph);
 429
 430         switch (softc->init_level) {
 431         case 0:
 432                 panic("targdtor - impossible init level");
 433         case 1:
 434                 /* FALLTHROUGH */
 435         default:
 436                 /* XXX Wait for callback of targbhdislun() */
 437                 msleep(softc, periph->sim->mtx, PRIBIO, "targbh", hz/2);
 438                 free(softc, M_SCSIBH);
 439                 break;
 440         }
 441 }
 442
 443 static void
 444 targbhstart(struct cam_periph *periph, union ccb *start_ccb)
 445 {
 446         struct targbh_softc *softc;
 447         struct ccb_hdr *ccbh;
 448         struct ccb_accept_tio *atio;
 449         struct targbh_cmd_desc *desc;
 450         struct ccb_scsiio *csio;
 451         ccb_flags flags;
 452
 453         softc = (struct targbh_softc *)periph->softc;
 454
 455         ccbh = TAILQ_FIRST(&softc->work_queue);
 456         if (periph->immediate_priority <= periph->pinfo.priority) {
 457                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WAITING;
 458                 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
 459                                   periph_links.sle);
 460                 periph->immediate_priority = CAM_PRIORITY_NONE;
 461                 wakeup(&periph->ccb_list);
 462         } else if (ccbh == NULL) {
 463                 xpt_release_ccb(start_ccb);
 464         } else {
 465                 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe);
 466                 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh,
 467                                   periph_links.tqe);
 468                 atio = (struct ccb_accept_tio*)ccbh;
 469                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 470
 471                 /* Is this a tagged request? */
 472                 flags = atio->ccb_h.flags &
 473                     (CAM_DIS_DISCONNECT|CAM_TAG_ACTION_VALID|CAM_DIR_MASK);
 474
 475                 csio = &start_ccb->csio;
 476                 /*
 477                  * If we are done with the transaction, tell the
 478                  * controller to send status and perform a CMD_CMPLT.
 479                  * If we have associated sense data, see if we can
 480                  * send that too.
 481                  */
 482                 if (desc->data_resid == desc->data_increment) {
 483                         flags |= CAM_SEND_STATUS;
 484                         if (atio->sense_len) {
 485                                 csio->sense_len = atio->sense_len;
 486                                 csio->sense_data = atio->sense_data;
 487                                 flags |= CAM_SEND_SENSE;
 488                         }
 489
 490                 }
 491
 492                 cam_fill_ctio(csio,
 493                               /*retries*/2,
 494                               targbhdone,
 495                               flags,
 496                               (flags & CAM_TAG_ACTION_VALID)?
 497                                 MSG_SIMPLE_Q_TAG : 0,
 498                               atio->tag_id,
 499                               atio->init_id,
 500                               desc->status,
 501                               /*data_ptr*/desc->data_increment == 0
 502                                           ? NULL : desc->data,
 503                               /*dxfer_len*/desc->data_increment,
 504                               /*timeout*/desc->timeout);
 505
 506                 /* Override our wildcard attachment */
 507                 start_ccb->ccb_h.target_id = atio->ccb_h.target_id;
 508                 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun;
 509
 510                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ;
 511                 start_ccb->ccb_h.ccb_atio = atio;
 512                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 513                           ("Sending a CTIO\n"));
 514                 xpt_action(start_ccb);
 515                 /*
 516                  * If the queue was frozen waiting for the response
 517                  * to this ATIO (for instance disconnection was disallowed),
 518                  * then release it now that our response has been queued.
 519                  */
 520                 if ((atio->ccb_h.status & CAM_DEV_QFRZN) != 0) {
 521                         cam_release_devq(periph->path,
 522                                          /*relsim_flags*/0,
 523                                          /*reduction*/0,
 524                                          /*timeout*/0,
 525                                          /*getcount_only*/0);
 526                         atio->ccb_h.status &= ~CAM_DEV_QFRZN;
 527                 }
 528                 ccbh = TAILQ_FIRST(&softc->work_queue);
 529         }
 530         if (ccbh != NULL)
 531                 xpt_schedule(periph, CAM_PRIORITY_NORMAL);
 532 }
 533
 534 static void
 535 targbhdone(struct cam_periph *periph, union ccb *done_ccb)
 536 {
 537         struct targbh_softc *softc;
 538
 539         softc = (struct targbh_softc *)periph->softc;
 540
 541         if (done_ccb->ccb_h.ccb_type == TARGBH_CCB_WAITING) {
 542                 /* Caller will release the CCB */
 543                 wakeup(&done_ccb->ccb_h.cbfcnp);
 544                 return;
 545         }
 546
 547         switch (done_ccb->ccb_h.func_code) {
 548         case XPT_ACCEPT_TARGET_IO:
 549         {
 550                 struct ccb_accept_tio *atio;
 551                 struct targbh_cmd_desc *descr;
 552                 u_int8_t *cdb;
 553                 int priority;
 554
 555                 atio = &done_ccb->atio;
 556                 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr;
 557                 cdb = atio->cdb_io.cdb_bytes;
 558                 if (softc->state == TARGBH_STATE_TEARDOWN
 559                  || atio->ccb_h.status == CAM_REQ_ABORTED) {
 560                         targbhfreedescr(descr);
 561                         xpt_free_ccb(done_ccb);
 562                         return;
 563                 }
 564
 565                 /*
 566                  * Determine the type of incoming command and
 567                  * setup our buffer for a response.
 568                  */
 569                 switch (cdb[0]) {
 570                 case INQUIRY:
 571                 {
 572                         struct scsi_inquiry *inq;
 573
 574                         inq = (struct scsi_inquiry *)cdb;
 575                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 576                                   ("Saw an inquiry!\n"));
 577                         /*
 578                          * Validate the command.  We don't
 579                          * support any VPD pages, so complain
 580                          * if EVPD is set.
 581                          */
 582                         if ((inq->byte2 & SI_EVPD) != 0
 583                          || inq->page_code != 0) {
 584                                 atio->ccb_h.flags &= ~CAM_DIR_MASK;
 585                                 atio->ccb_h.flags |= CAM_DIR_NONE;
 586                                 /*
 587                                  * This needs to have other than a
 588                                  * no_lun_sense_data response.
 589                                  */
 590                                 bcopy(&no_lun_sense_data, &atio->sense_data,
 591                                       min(sizeof(no_lun_sense_data),
 592                                           sizeof(atio->sense_data)));
 593                                 atio->sense_len = sizeof(no_lun_sense_data);
 594                                 descr->data_resid = 0;
 595                                 descr->data_increment = 0;
 596                                 descr->status = SCSI_STATUS_CHECK_COND;
 597                                 break;
 598                         }
 599                         /*
 600                          * Direction is always relative
 601                          * to the initator.
 602                          */
 603                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 604                         atio->ccb_h.flags |= CAM_DIR_IN;
 605                         descr->data = &no_lun_inq_data;
 606                         descr->data_resid = MIN(sizeof(no_lun_inq_data),
 607                                                 scsi_2btoul(inq->length));
 608                         descr->data_increment = descr->data_resid;
 609                         descr->timeout = 5 * 1000;
 610                         descr->status = SCSI_STATUS_OK;
 611                         break;
 612                 }
 613                 case REQUEST_SENSE:
 614                 {
 615                         struct scsi_request_sense *rsense;
 616
 617                         rsense = (struct scsi_request_sense *)cdb;
 618                         /* Refer to static sense data */
 619                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 620                         atio->ccb_h.flags |= CAM_DIR_IN;
 621                         descr->data = &no_lun_sense_data;
 622                         descr->data_resid = request_sense_size;
 623                         descr->data_resid = MIN(descr->data_resid,
 624                                                 SCSI_CDB6_LEN(rsense->length));
 625                         descr->data_increment = descr->data_resid;
 626                         descr->timeout = 5 * 1000;
 627                         descr->status = SCSI_STATUS_OK;
 628                         break;
 629                 }
 630                 default:
 631                         /* Constant CA, tell initiator */
 632                         /* Direction is always relative to the initator */
 633                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 634                         atio->ccb_h.flags |= CAM_DIR_NONE;
 635                         bcopy(&no_lun_sense_data, &atio->sense_data,
 636                               min(sizeof(no_lun_sense_data),
 637                                   sizeof(atio->sense_data)));
 638                         atio->sense_len = sizeof (no_lun_sense_data);
 639                         descr->data_resid = 0;
 640                         descr->data_increment = 0;
 641                         descr->timeout = 5 * 1000;
 642                         descr->status = SCSI_STATUS_CHECK_COND;
 643                         break;
 644                 }
 645
 646                 /* Queue us up to receive a Continue Target I/O ccb. */
 647                 if ((atio->ccb_h.flags & CAM_DIS_DISCONNECT) != 0) {
 648                         TAILQ_INSERT_HEAD(&softc->work_queue, &atio->ccb_h,
 649                                           periph_links.tqe);
 650                         priority = 0;
 651                 } else {
 652                         TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h,
 653                                           periph_links.tqe);
 654                         priority = CAM_PRIORITY_NORMAL;
 655                 }
 656                 xpt_schedule(periph, priority);
 657                 break;
 658         }
 659         case XPT_CONT_TARGET_IO:
 660         {
 661                 struct ccb_accept_tio *atio;
 662                 struct targbh_cmd_desc *desc;
 663
 664                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 665                           ("Received completed CTIO\n"));
 666                 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio;
 667                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 668
 669                 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h,
 670                              periph_links.tqe);
 671
 672                 /*
 673                  * We could check for CAM_SENT_SENSE bein set here,
 674                  * but since we're not maintaining any CA/UA state,
 675                  * there's no point.
 676                  */
 677                 atio->sense_len = 0;
 678                 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE;
 679                 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE;
 680
 681                 /*
 682                  * Any errors will not change the data we return,
 683                  * so make sure the queue is not left frozen.
 684                  * XXX - At some point there may be errors that
 685                  *       leave us in a connected state with the
 686                  *       initiator...
 687                  */
 688                 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
 689                         printf("Releasing Queue\n");
 690                         cam_release_devq(done_ccb->ccb_h.path,
 691                                          /*relsim_flags*/0,
 692                                          /*reduction*/0,
 693                                          /*timeout*/0,
 694                                          /*getcount_only*/0);
 695                         done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
 696                 }
 697                 desc->data_resid -= desc->data_increment;
 698                 xpt_release_ccb(done_ccb);
 699                 if (softc->state != TARGBH_STATE_TEARDOWN) {
 700
 701                         /*
 702                          * Send the original accept TIO back to the
 703                          * controller to handle more work.
 704                          */
 705                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 706                                   ("Returning ATIO to target\n"));
 707                         /* Restore wildcards */
 708                         atio->ccb_h.target_id = CAM_TARGET_WILDCARD;
 709                         atio->ccb_h.target_lun = CAM_LUN_WILDCARD;
 710                         xpt_action((union ccb *)atio);
 711                         break;
 712                 } else {
 713                         targbhfreedescr(desc);
 714                         free(atio, M_SCSIBH);
 715                 }
 716                 break;
 717         }
 718         case XPT_IMMED_NOTIFY:
 719         {
 720                 int frozen;
 721
 722                 frozen = (done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0;
 723                 if (softc->state == TARGBH_STATE_TEARDOWN
 724                  || done_ccb->ccb_h.status == CAM_REQ_ABORTED) {
 725                         printf("Freed an immediate notify\n");
 726                         xpt_free_ccb(done_ccb);
 727                 } else {
 728                         /* Requeue for another immediate event */
 729                         xpt_action(done_ccb);
 730                 }
 731                 if (frozen != 0)
 732                         cam_release_devq(periph->path,
 733                                          /*relsim_flags*/0,
 734                                          /*opening reduction*/0,
 735                                          /*timeout*/0,
 736                                          /*getcount_only*/0);
 737                 break;
 738         }
 739         default:
 740                 panic("targbhdone: Unexpected ccb opcode");
 741                 break;
 742         }
 743 }
 744
 745 #ifdef NOTYET
 746 static int
 747 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
 748 {
 749         return 0;
 750 }
 751 #endif
 752
 753 static struct targbh_cmd_desc*
 754 targbhallocdescr()
 755 {
 756         struct targbh_cmd_desc* descr;
 757
 758         /* Allocate the targbh_descr structure */
 759         descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr),
 760                                                M_SCSIBH, M_NOWAIT);
 761         if (descr == NULL)
 762                 return (NULL);
 763
 764         bzero(descr, sizeof(*descr));
 765
 766         /* Allocate buffer backing store */
 767         descr->backing_store = malloc(MAX_BUF_SIZE, M_SCSIBH, M_NOWAIT);
 768         if (descr->backing_store == NULL) {
 769                 free(descr, M_SCSIBH);
 770                 return (NULL);
 771         }
 772         descr->max_size = MAX_BUF_SIZE;
 773         return (descr);
 774 }
 775
 776 static void
 777 targbhfreedescr(struct targbh_cmd_desc *descr)
 778 {
 779         free(descr->backing_store, M_SCSIBH);
 780         free(descr, M_SCSIBH);
 781 }