sys/cam/scsi/scsi_targ_bh.c

   1 /*-
   2  * Implementation of the Target Mode 'Black Hole device' for CAM.
   3  *
   4  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   5  *
   6  * Copyright (c) 1999 Justin T. Gibbs.
   7  * All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions, and the following disclaimer,
  14  *    without modification, immediately at the beginning of the file.
  15  * 2. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  22  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #include <sys/cdefs.h>
  32 __FBSDID("$FreeBSD$");
  33
  34 #include <sys/param.h>
  35 #include <sys/queue.h>
  36 #include <sys/systm.h>
  37 #include <sys/kernel.h>
  38 #include <sys/types.h>
  39 #include <sys/bio.h>
  40 #include <sys/conf.h>
  41 #include <sys/devicestat.h>
  42 #include <sys/malloc.h>
  43 #include <sys/uio.h>
  44
  45 #include <cam/cam.h>
  46 #include <cam/cam_ccb.h>
  47 #include <cam/cam_periph.h>
  48 #include <cam/cam_queue.h>
  49 #include <cam/cam_xpt_periph.h>
  50 #include <cam/cam_debug.h>
  51 #include <cam/cam_sim.h>
  52
  53 #include <cam/scsi/scsi_all.h>
  54 #include <cam/scsi/scsi_message.h>
  55
  56 static MALLOC_DEFINE(M_SCSIBH, "SCSI bh", "SCSI blackhole buffers");
  57
  58 typedef enum {
  59         TARGBH_STATE_NORMAL,
  60         TARGBH_STATE_EXCEPTION,
  61         TARGBH_STATE_TEARDOWN
  62 } targbh_state;
  63
  64 typedef enum {
  65         TARGBH_FLAG_NONE         = 0x00,
  66         TARGBH_FLAG_LUN_ENABLED  = 0x01
  67 } targbh_flags;
  68
  69 typedef enum {
  70         TARGBH_CCB_WORKQ
  71 } targbh_ccb_types;
  72
  73 #define MAX_ACCEPT      8
  74 #define MAX_IMMEDIATE   16
  75 #define MAX_BUF_SIZE    256     /* Max inquiry/sense/mode page transfer */
  76
  77 /* Offsets into our private CCB area for storing accept information */
  78 #define ccb_type        ppriv_field0
  79 #define ccb_descr       ppriv_ptr1
  80
  81 /* We stick a pointer to the originating accept TIO in each continue I/O CCB */
  82 #define ccb_atio        ppriv_ptr1
  83
  84 TAILQ_HEAD(ccb_queue, ccb_hdr);
  85
  86 struct targbh_softc {
  87         struct          ccb_queue pending_queue;
  88         struct          ccb_queue work_queue;
  89         struct          ccb_queue unknown_atio_queue;
  90         struct          devstat device_stats;
  91         targbh_state    state;
  92         targbh_flags    flags;
  93         u_int           init_level;
  94         u_int           inq_data_len;
  95         struct          ccb_accept_tio *accept_tio_list;
  96         struct          ccb_hdr_slist immed_notify_slist;
  97 };
  98
  99 struct targbh_cmd_desc {
 100         struct    ccb_accept_tio* atio_link;
 101         u_int     data_resid;   /* How much left to transfer */
 102         u_int     data_increment;/* Amount to send before next disconnect */
 103         void*     data;         /* The data. Can be from backing_store or not */
 104         void*     backing_store;/* Backing store allocated for this descriptor*/
 105         u_int     max_size;     /* Size of backing_store */
 106         u_int32_t timeout;
 107         u_int8_t  status;       /* Status to return to initiator */
 108 };
 109
 110 static struct scsi_inquiry_data no_lun_inq_data =
 111 {
 112         T_NODEVICE | (SID_QUAL_BAD_LU << 5), 0,
 113         /* version */2, /* format version */2
 114 };
 115
 116 static struct scsi_sense_data_fixed no_lun_sense_data =
 117 {
 118         SSD_CURRENT_ERROR|SSD_ERRCODE_VALID,
 119         0,
 120         SSD_KEY_NOT_READY,
 121         { 0, 0, 0, 0 },
 122         /*extra_len*/offsetof(struct scsi_sense_data_fixed, fru)
 123                    - offsetof(struct scsi_sense_data_fixed, extra_len),
 124         { 0, 0, 0, 0 },
 125         /* Logical Unit Not Supported */
 126         /*ASC*/0x25, /*ASCQ*/0
 127 };
 128
 129 static const int request_sense_size = offsetof(struct scsi_sense_data_fixed, fru);
 130
 131 static periph_init_t    targbhinit;
 132 static void             targbhasync(void *callback_arg, u_int32_t code,
 133                                     struct cam_path *path, void *arg);
 134 static cam_status       targbhenlun(struct cam_periph *periph);
 135 static cam_status       targbhdislun(struct cam_periph *periph);
 136 static periph_ctor_t    targbhctor;
 137 static periph_dtor_t    targbhdtor;
 138 static periph_start_t   targbhstart;
 139 static void             targbhdone(struct cam_periph *periph,
 140                                    union ccb *done_ccb);
 141 #ifdef NOTYET
 142 static  int             targbherror(union ccb *ccb, u_int32_t cam_flags,
 143                                     u_int32_t sense_flags);
 144 #endif
 145 static struct targbh_cmd_desc*  targbhallocdescr(void);
 146 static void             targbhfreedescr(struct targbh_cmd_desc *buf);
 147
 148 static struct periph_driver targbhdriver =
 149 {
 150         targbhinit, "targbh",
 151         TAILQ_HEAD_INITIALIZER(targbhdriver.units), /* generation */ 0
 152 };
 153
 154 PERIPHDRIVER_DECLARE(targbh, targbhdriver);
 155
 156 static void
 157 targbhinit(void)
 158 {
 159         cam_status status;
 160
 161         /*
 162          * Install a global async callback.  This callback will
 163          * receive async callbacks like "new path registered".
 164          */
 165         status = xpt_register_async(AC_PATH_REGISTERED | AC_PATH_DEREGISTERED,
 166                                     targbhasync, NULL, NULL);
 167
 168         if (status != CAM_REQ_CMP) {
 169                 printf("targbh: Failed to attach master async callback "
 170                        "due to status 0x%x!\n", status);
 171         }
 172 }
 173
 174 static void
 175 targbhasync(void *callback_arg, u_int32_t code,
 176             struct cam_path *path, void *arg)
 177 {
 178         struct cam_path *new_path;
 179         struct ccb_pathinq *cpi;
 180         path_id_t bus_path_id;
 181         cam_status status;
 182
 183         cpi = (struct ccb_pathinq *)arg;
 184         if (code == AC_PATH_REGISTERED)
 185                 bus_path_id = cpi->ccb_h.path_id;
 186         else
 187                 bus_path_id = xpt_path_path_id(path);
 188         /*
 189          * Allocate a peripheral instance for
 190          * this target instance.
 191          */
 192         status = xpt_create_path(&new_path, NULL,
 193                                  bus_path_id,
 194                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
 195         if (status != CAM_REQ_CMP) {
 196                 printf("targbhasync: Unable to create path "
 197                         "due to status 0x%x\n", status);
 198                 return;
 199         }
 200
 201         switch (code) {
 202         case AC_PATH_REGISTERED:
 203         {
 204                 /* Only attach to controllers that support target mode */
 205                 if ((cpi->target_sprt & PIT_PROCESSOR) == 0)
 206                         break;
 207
 208                 status = cam_periph_alloc(targbhctor, NULL, targbhdtor,
 209                                           targbhstart,
 210                                           "targbh", CAM_PERIPH_BIO,
 211                                           new_path, targbhasync,
 212                                           AC_PATH_REGISTERED,
 213                                           cpi);
 214                 break;
 215         }
 216         case AC_PATH_DEREGISTERED:
 217         {
 218                 struct cam_periph *periph;
 219
 220                 if ((periph = cam_periph_find(new_path, "targbh")) != NULL)
 221                         cam_periph_invalidate(periph);
 222                 break;
 223         }
 224         default:
 225                 break;
 226         }
 227         xpt_free_path(new_path);
 228 }
 229
 230 /* Attempt to enable our lun */
 231 static cam_status
 232 targbhenlun(struct cam_periph *periph)
 233 {
 234         union ccb immed_ccb;
 235         struct targbh_softc *softc;
 236         cam_status status;
 237         int i;
 238
 239         softc = (struct targbh_softc *)periph->softc;
 240
 241         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0)
 242                 return (CAM_REQ_CMP);
 243
 244         xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 245         immed_ccb.ccb_h.func_code = XPT_EN_LUN;
 246
 247         /* Don't need support for any vendor specific commands */
 248         immed_ccb.cel.grp6_len = 0;
 249         immed_ccb.cel.grp7_len = 0;
 250         immed_ccb.cel.enable = 1;
 251         xpt_action(&immed_ccb);
 252         status = immed_ccb.ccb_h.status;
 253         if (status != CAM_REQ_CMP) {
 254                 xpt_print(periph->path,
 255                     "targbhenlun - Enable Lun Rejected with status 0x%x\n",
 256                     status);
 257                 return (status);
 258         }
 259
 260         softc->flags |= TARGBH_FLAG_LUN_ENABLED;
 261
 262         /*
 263          * Build up a buffer of accept target I/O
 264          * operations for incoming selections.
 265          */
 266         for (i = 0; i < MAX_ACCEPT; i++) {
 267                 struct ccb_accept_tio *atio;
 268
 269                 atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_SCSIBH,
 270                                                       M_NOWAIT);
 271                 if (atio == NULL) {
 272                         status = CAM_RESRC_UNAVAIL;
 273                         break;
 274                 }
 275
 276                 atio->ccb_h.ccb_descr = targbhallocdescr();
 277
 278                 if (atio->ccb_h.ccb_descr == NULL) {
 279                         free(atio, M_SCSIBH);
 280                         status = CAM_RESRC_UNAVAIL;
 281                         break;
 282                 }
 283
 284                 xpt_setup_ccb(&atio->ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 285                 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO;
 286                 atio->ccb_h.cbfcnp = targbhdone;
 287                 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link =
 288                     softc->accept_tio_list;
 289                 softc->accept_tio_list = atio;
 290                 xpt_action((union ccb *)atio);
 291                 status = atio->ccb_h.status;
 292                 if (status != CAM_REQ_INPROG)
 293                         break;
 294         }
 295
 296         if (i == 0) {
 297                 xpt_print(periph->path,
 298                     "targbhenlun - Could not allocate accept tio CCBs: status "
 299                     "= 0x%x\n", status);
 300                 targbhdislun(periph);
 301                 return (CAM_REQ_CMP_ERR);
 302         }
 303
 304         /*
 305          * Build up a buffer of immediate notify CCBs
 306          * so the SIM can tell us of asynchronous target mode events.
 307          */
 308         for (i = 0; i < MAX_ACCEPT; i++) {
 309                 struct ccb_immediate_notify *inot;
 310
 311                 inot = (struct ccb_immediate_notify*)malloc(sizeof(*inot),
 312                             M_SCSIBH, M_NOWAIT);
 313
 314                 if (inot == NULL) {
 315                         status = CAM_RESRC_UNAVAIL;
 316                         break;
 317                 }
 318
 319                 xpt_setup_ccb(&inot->ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 320                 inot->ccb_h.func_code = XPT_IMMEDIATE_NOTIFY;
 321                 inot->ccb_h.cbfcnp = targbhdone;
 322                 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h,
 323                                   periph_links.sle);
 324                 xpt_action((union ccb *)inot);
 325                 status = inot->ccb_h.status;
 326                 if (status != CAM_REQ_INPROG)
 327                         break;
 328         }
 329
 330         if (i == 0) {
 331                 xpt_print(periph->path,
 332                     "targbhenlun - Could not allocate immediate notify "
 333                     "CCBs: status = 0x%x\n", status);
 334                 targbhdislun(periph);
 335                 return (CAM_REQ_CMP_ERR);
 336         }
 337
 338         return (CAM_REQ_CMP);
 339 }
 340
 341 static cam_status
 342 targbhdislun(struct cam_periph *periph)
 343 {
 344         union ccb ccb;
 345         struct targbh_softc *softc;
 346         struct ccb_accept_tio* atio;
 347         struct ccb_hdr *ccb_h;
 348
 349         softc = (struct targbh_softc *)periph->softc;
 350         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0)
 351                 return CAM_REQ_CMP;
 352
 353         /* XXX Block for Continue I/O completion */
 354
 355         /* Kill off all ACCECPT and IMMEDIATE CCBs */
 356         while ((atio = softc->accept_tio_list) != NULL) {
 357
 358                 softc->accept_tio_list =
 359                     ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link;
 360                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 361                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 362                 ccb.cab.abort_ccb = (union ccb *)atio;
 363                 xpt_action(&ccb);
 364         }
 365
 366         while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) {
 367                 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle);
 368                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 369                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 370                 ccb.cab.abort_ccb = (union ccb *)ccb_h;
 371                 xpt_action(&ccb);
 372         }
 373
 374         /*
 375          * Dissable this lun.
 376          */
 377         xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 378         ccb.cel.ccb_h.func_code = XPT_EN_LUN;
 379         ccb.cel.enable = 0;
 380         xpt_action(&ccb);
 381
 382         if (ccb.cel.ccb_h.status != CAM_REQ_CMP)
 383                 printf("targbhdislun - Disabling lun on controller failed "
 384                        "with status 0x%x\n", ccb.cel.ccb_h.status);
 385         else
 386                 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED;
 387         return (ccb.cel.ccb_h.status);
 388 }
 389
 390 static cam_status
 391 targbhctor(struct cam_periph *periph, void *arg)
 392 {
 393         struct targbh_softc *softc;
 394
 395         /* Allocate our per-instance private storage */
 396         softc = (struct targbh_softc *)malloc(sizeof(*softc),
 397                                               M_SCSIBH, M_NOWAIT);
 398         if (softc == NULL) {
 399                 printf("targctor: unable to malloc softc\n");
 400                 return (CAM_REQ_CMP_ERR);
 401         }
 402
 403         bzero(softc, sizeof(*softc));
 404         TAILQ_INIT(&softc->pending_queue);
 405         TAILQ_INIT(&softc->work_queue);
 406         softc->accept_tio_list = NULL;
 407         SLIST_INIT(&softc->immed_notify_slist);
 408         softc->state = TARGBH_STATE_NORMAL;
 409         periph->softc = softc;
 410         softc->init_level++;
 411
 412         if (targbhenlun(periph) != CAM_REQ_CMP)
 413                 cam_periph_invalidate(periph);
 414         return (CAM_REQ_CMP);
 415 }
 416
 417 static void
 418 targbhdtor(struct cam_periph *periph)
 419 {
 420         struct targbh_softc *softc;
 421
 422         softc = (struct targbh_softc *)periph->softc;
 423
 424         softc->state = TARGBH_STATE_TEARDOWN;
 425
 426         targbhdislun(periph);
 427
 428         switch (softc->init_level) {
 429         case 0:
 430                 panic("targdtor - impossible init level");
 431         case 1:
 432                 /* FALLTHROUGH */
 433         default:
 434                 /* XXX Wait for callback of targbhdislun() */
 435                 cam_periph_sleep(periph, softc, PRIBIO, "targbh", hz/2);
 436                 free(softc, M_SCSIBH);
 437                 break;
 438         }
 439 }
 440
 441 static void
 442 targbhstart(struct cam_periph *periph, union ccb *start_ccb)
 443 {
 444         struct targbh_softc *softc;
 445         struct ccb_hdr *ccbh;
 446         struct ccb_accept_tio *atio;
 447         struct targbh_cmd_desc *desc;
 448         struct ccb_scsiio *csio;
 449         ccb_flags flags;
 450
 451         softc = (struct targbh_softc *)periph->softc;
 452
 453         ccbh = TAILQ_FIRST(&softc->work_queue);
 454         if (ccbh == NULL) {
 455                 xpt_release_ccb(start_ccb);
 456         } else {
 457                 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe);
 458                 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh,
 459                                   periph_links.tqe);
 460                 atio = (struct ccb_accept_tio*)ccbh;
 461                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 462
 463                 /* Is this a tagged request? */
 464                 flags = atio->ccb_h.flags &
 465                     (CAM_DIS_DISCONNECT|CAM_TAG_ACTION_VALID|CAM_DIR_MASK);
 466
 467                 csio = &start_ccb->csio;
 468                 /*
 469                  * If we are done with the transaction, tell the
 470                  * controller to send status and perform a CMD_CMPLT.
 471                  * If we have associated sense data, see if we can
 472                  * send that too.
 473                  */
 474                 if (desc->data_resid == desc->data_increment) {
 475                         flags |= CAM_SEND_STATUS;
 476                         if (atio->sense_len) {
 477                                 csio->sense_len = atio->sense_len;
 478                                 csio->sense_data = atio->sense_data;
 479                                 flags |= CAM_SEND_SENSE;
 480                         }
 481
 482                 }
 483
 484                 cam_fill_ctio(csio,
 485                               /*retries*/2,
 486                               targbhdone,
 487                               flags,
 488                               (flags & CAM_TAG_ACTION_VALID)?
 489                                 MSG_SIMPLE_Q_TAG : 0,
 490                               atio->tag_id,
 491                               atio->init_id,
 492                               desc->status,
 493                               /*data_ptr*/desc->data_increment == 0
 494                                           ? NULL : desc->data,
 495                               /*dxfer_len*/desc->data_increment,
 496                               /*timeout*/desc->timeout);
 497
 498                 /* Override our wildcard attachment */
 499                 start_ccb->ccb_h.target_id = atio->ccb_h.target_id;
 500                 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun;
 501
 502                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ;
 503                 start_ccb->ccb_h.ccb_atio = atio;
 504                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 505                           ("Sending a CTIO\n"));
 506                 xpt_action(start_ccb);
 507                 /*
 508                  * If the queue was frozen waiting for the response
 509                  * to this ATIO (for instance disconnection was disallowed),
 510                  * then release it now that our response has been queued.
 511                  */
 512                 if ((atio->ccb_h.status & CAM_DEV_QFRZN) != 0) {
 513                         cam_release_devq(periph->path,
 514                                          /*relsim_flags*/0,
 515                                          /*reduction*/0,
 516                                          /*timeout*/0,
 517                                          /*getcount_only*/0);
 518                         atio->ccb_h.status &= ~CAM_DEV_QFRZN;
 519                 }
 520                 ccbh = TAILQ_FIRST(&softc->work_queue);
 521         }
 522         if (ccbh != NULL)
 523                 xpt_schedule(periph, CAM_PRIORITY_NORMAL);
 524 }
 525
 526 static void
 527 targbhdone(struct cam_periph *periph, union ccb *done_ccb)
 528 {
 529         struct targbh_softc *softc;
 530
 531         softc = (struct targbh_softc *)periph->softc;
 532
 533         switch (done_ccb->ccb_h.func_code) {
 534         case XPT_ACCEPT_TARGET_IO:
 535         {
 536                 struct ccb_accept_tio *atio;
 537                 struct targbh_cmd_desc *descr;
 538                 u_int8_t *cdb;
 539                 int priority;
 540
 541                 atio = &done_ccb->atio;
 542                 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr;
 543                 cdb = atio->cdb_io.cdb_bytes;
 544                 if (softc->state == TARGBH_STATE_TEARDOWN
 545                  || atio->ccb_h.status == CAM_REQ_ABORTED) {
 546                         targbhfreedescr(descr);
 547                         xpt_free_ccb(done_ccb);
 548                         return;
 549                 }
 550
 551                 /*
 552                  * Determine the type of incoming command and
 553                  * setup our buffer for a response.
 554                  */
 555                 switch (cdb[0]) {
 556                 case INQUIRY:
 557                 {
 558                         struct scsi_inquiry *inq;
 559
 560                         inq = (struct scsi_inquiry *)cdb;
 561                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 562                                   ("Saw an inquiry!\n"));
 563                         /*
 564                          * Validate the command.  We don't
 565                          * support any VPD pages, so complain
 566                          * if EVPD is set.
 567                          */
 568                         if ((inq->byte2 & SI_EVPD) != 0
 569                          || inq->page_code != 0) {
 570                                 atio->ccb_h.flags &= ~CAM_DIR_MASK;
 571                                 atio->ccb_h.flags |= CAM_DIR_NONE;
 572                                 /*
 573                                  * This needs to have other than a
 574                                  * no_lun_sense_data response.
 575                                  */
 576                                 bcopy(&no_lun_sense_data, &atio->sense_data,
 577                                       min(sizeof(no_lun_sense_data),
 578                                           sizeof(atio->sense_data)));
 579                                 atio->sense_len = sizeof(no_lun_sense_data);
 580                                 descr->data_resid = 0;
 581                                 descr->data_increment = 0;
 582                                 descr->status = SCSI_STATUS_CHECK_COND;
 583                                 break;
 584                         }
 585                         /*
 586                          * Direction is always relative
 587                          * to the initator.
 588                          */
 589                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 590                         atio->ccb_h.flags |= CAM_DIR_IN;
 591                         descr->data = &no_lun_inq_data;
 592                         descr->data_resid = MIN(sizeof(no_lun_inq_data),
 593                                                 scsi_2btoul(inq->length));
 594                         descr->data_increment = descr->data_resid;
 595                         descr->timeout = 5 * 1000;
 596                         descr->status = SCSI_STATUS_OK;
 597                         break;
 598                 }
 599                 case REQUEST_SENSE:
 600                 {
 601                         struct scsi_request_sense *rsense;
 602
 603                         rsense = (struct scsi_request_sense *)cdb;
 604                         /* Refer to static sense data */
 605                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 606                         atio->ccb_h.flags |= CAM_DIR_IN;
 607                         descr->data = &no_lun_sense_data;
 608                         descr->data_resid = request_sense_size;
 609                         descr->data_resid = MIN(descr->data_resid,
 610                                                 SCSI_CDB6_LEN(rsense->length));
 611                         descr->data_increment = descr->data_resid;
 612                         descr->timeout = 5 * 1000;
 613                         descr->status = SCSI_STATUS_OK;
 614                         break;
 615                 }
 616                 default:
 617                         /* Constant CA, tell initiator */
 618                         /* Direction is always relative to the initator */
 619                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 620                         atio->ccb_h.flags |= CAM_DIR_NONE;
 621                         bcopy(&no_lun_sense_data, &atio->sense_data,
 622                               min(sizeof(no_lun_sense_data),
 623                                   sizeof(atio->sense_data)));
 624                         atio->sense_len = sizeof (no_lun_sense_data);
 625                         descr->data_resid = 0;
 626                         descr->data_increment = 0;
 627                         descr->timeout = 5 * 1000;
 628                         descr->status = SCSI_STATUS_CHECK_COND;
 629                         break;
 630                 }
 631
 632                 /* Queue us up to receive a Continue Target I/O ccb. */
 633                 if ((atio->ccb_h.flags & CAM_DIS_DISCONNECT) != 0) {
 634                         TAILQ_INSERT_HEAD(&softc->work_queue, &atio->ccb_h,
 635                                           periph_links.tqe);
 636                         priority = 0;
 637                 } else {
 638                         TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h,
 639                                           periph_links.tqe);
 640                         priority = CAM_PRIORITY_NORMAL;
 641                 }
 642                 xpt_schedule(periph, priority);
 643                 break;
 644         }
 645         case XPT_CONT_TARGET_IO:
 646         {
 647                 struct ccb_accept_tio *atio;
 648                 struct targbh_cmd_desc *desc;
 649
 650                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 651                           ("Received completed CTIO\n"));
 652                 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio;
 653                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 654
 655                 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h,
 656                              periph_links.tqe);
 657
 658                 /*
 659                  * We could check for CAM_SENT_SENSE bein set here,
 660                  * but since we're not maintaining any CA/UA state,
 661                  * there's no point.
 662                  */
 663                 atio->sense_len = 0;
 664                 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE;
 665                 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE;
 666
 667                 /*
 668                  * Any errors will not change the data we return,
 669                  * so make sure the queue is not left frozen.
 670                  * XXX - At some point there may be errors that
 671                  *       leave us in a connected state with the
 672                  *       initiator...
 673                  */
 674                 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
 675                         printf("Releasing Queue\n");
 676                         cam_release_devq(done_ccb->ccb_h.path,
 677                                          /*relsim_flags*/0,
 678                                          /*reduction*/0,
 679                                          /*timeout*/0,
 680                                          /*getcount_only*/0);
 681                         done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
 682                 }
 683                 desc->data_resid -= desc->data_increment;
 684                 xpt_release_ccb(done_ccb);
 685                 if (softc->state != TARGBH_STATE_TEARDOWN) {
 686
 687                         /*
 688                          * Send the original accept TIO back to the
 689                          * controller to handle more work.
 690                          */
 691                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 692                                   ("Returning ATIO to target\n"));
 693                         /* Restore wildcards */
 694                         atio->ccb_h.target_id = CAM_TARGET_WILDCARD;
 695                         atio->ccb_h.target_lun = CAM_LUN_WILDCARD;
 696                         xpt_action((union ccb *)atio);
 697                         break;
 698                 } else {
 699                         targbhfreedescr(desc);
 700                         free(atio, M_SCSIBH);
 701                 }
 702                 break;
 703         }
 704         case XPT_IMMEDIATE_NOTIFY:
 705         {
 706                 int frozen;
 707
 708                 frozen = (done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0;
 709                 if (softc->state == TARGBH_STATE_TEARDOWN
 710                  || done_ccb->ccb_h.status == CAM_REQ_ABORTED) {
 711                         printf("Freed an immediate notify\n");
 712                         xpt_free_ccb(done_ccb);
 713                 } else {
 714                         /* Requeue for another immediate event */
 715                         xpt_action(done_ccb);
 716                 }
 717                 if (frozen != 0)
 718                         cam_release_devq(periph->path,
 719                                          /*relsim_flags*/0,
 720                                          /*opening reduction*/0,
 721                                          /*timeout*/0,
 722                                          /*getcount_only*/0);
 723                 break;
 724         }
 725         default:
 726                 panic("targbhdone: Unexpected ccb opcode");
 727                 break;
 728         }
 729 }
 730
 731 #ifdef NOTYET
 732 static int
 733 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
 734 {
 735         return 0;
 736 }
 737 #endif
 738
 739 static struct targbh_cmd_desc*
 740 targbhallocdescr()
 741 {
 742         struct targbh_cmd_desc* descr;
 743
 744         /* Allocate the targbh_descr structure */
 745         descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr),
 746                                                M_SCSIBH, M_NOWAIT);
 747         if (descr == NULL)
 748                 return (NULL);
 749
 750         bzero(descr, sizeof(*descr));
 751
 752         /* Allocate buffer backing store */
 753         descr->backing_store = malloc(MAX_BUF_SIZE, M_SCSIBH, M_NOWAIT);
 754         if (descr->backing_store == NULL) {
 755                 free(descr, M_SCSIBH);
 756                 return (NULL);
 757         }
 758         descr->max_size = MAX_BUF_SIZE;
 759         return (descr);
 760 }
 761
 762 static void
 763 targbhfreedescr(struct targbh_cmd_desc *descr)
 764 {
 765         free(descr->backing_store, M_SCSIBH);
 766         free(descr, M_SCSIBH);
 767 }