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         memset(&immed_ccb, 0, sizeof(immed_ccb));
 245         xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 246         immed_ccb.ccb_h.func_code = XPT_EN_LUN;
 247
 248         /* Don't need support for any vendor specific commands */
 249         immed_ccb.cel.grp6_len = 0;
 250         immed_ccb.cel.grp7_len = 0;
 251         immed_ccb.cel.enable = 1;
 252         xpt_action(&immed_ccb);
 253         status = immed_ccb.ccb_h.status;
 254         if (status != CAM_REQ_CMP) {
 255                 xpt_print(periph->path,
 256                     "targbhenlun - Enable Lun Rejected with status 0x%x\n",
 257                     status);
 258                 return (status);
 259         }
 260
 261         softc->flags |= TARGBH_FLAG_LUN_ENABLED;
 262
 263         /*
 264          * Build up a buffer of accept target I/O
 265          * operations for incoming selections.
 266          */
 267         for (i = 0; i < MAX_ACCEPT; i++) {
 268                 struct ccb_accept_tio *atio;
 269
 270                 atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_SCSIBH,
 271                                                       M_ZERO | M_NOWAIT);
 272                 if (atio == NULL) {
 273                         status = CAM_RESRC_UNAVAIL;
 274                         break;
 275                 }
 276
 277                 atio->ccb_h.ccb_descr = targbhallocdescr();
 278
 279                 if (atio->ccb_h.ccb_descr == NULL) {
 280                         free(atio, M_SCSIBH);
 281                         status = CAM_RESRC_UNAVAIL;
 282                         break;
 283                 }
 284
 285                 xpt_setup_ccb(&atio->ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 286                 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO;
 287                 atio->ccb_h.cbfcnp = targbhdone;
 288                 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link =
 289                     softc->accept_tio_list;
 290                 softc->accept_tio_list = atio;
 291                 xpt_action((union ccb *)atio);
 292                 status = atio->ccb_h.status;
 293                 if (status != CAM_REQ_INPROG)
 294                         break;
 295         }
 296
 297         if (i == 0) {
 298                 xpt_print(periph->path,
 299                     "targbhenlun - Could not allocate accept tio CCBs: status "
 300                     "= 0x%x\n", status);
 301                 targbhdislun(periph);
 302                 return (CAM_REQ_CMP_ERR);
 303         }
 304
 305         /*
 306          * Build up a buffer of immediate notify CCBs
 307          * so the SIM can tell us of asynchronous target mode events.
 308          */
 309         for (i = 0; i < MAX_ACCEPT; i++) {
 310                 struct ccb_immediate_notify *inot;
 311
 312                 inot = (struct ccb_immediate_notify*)malloc(sizeof(*inot),
 313                             M_SCSIBH, M_ZERO | M_NOWAIT);
 314
 315                 if (inot == NULL) {
 316                         status = CAM_RESRC_UNAVAIL;
 317                         break;
 318                 }
 319
 320                 xpt_setup_ccb(&inot->ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 321                 inot->ccb_h.func_code = XPT_IMMEDIATE_NOTIFY;
 322                 inot->ccb_h.cbfcnp = targbhdone;
 323                 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h,
 324                                   periph_links.sle);
 325                 xpt_action((union ccb *)inot);
 326                 status = inot->ccb_h.status;
 327                 if (status != CAM_REQ_INPROG)
 328                         break;
 329         }
 330
 331         if (i == 0) {
 332                 xpt_print(periph->path,
 333                     "targbhenlun - Could not allocate immediate notify "
 334                     "CCBs: status = 0x%x\n", status);
 335                 targbhdislun(periph);
 336                 return (CAM_REQ_CMP_ERR);
 337         }
 338
 339         return (CAM_REQ_CMP);
 340 }
 341
 342 static cam_status
 343 targbhdislun(struct cam_periph *periph)
 344 {
 345         union ccb ccb;
 346         struct targbh_softc *softc;
 347         struct ccb_accept_tio* atio;
 348         struct ccb_hdr *ccb_h;
 349
 350         softc = (struct targbh_softc *)periph->softc;
 351         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0)
 352                 return CAM_REQ_CMP;
 353
 354         memset(&ccb, 0, sizeof(ccb));
 355
 356         /* XXX Block for Continue I/O completion */
 357
 358         /* Kill off all ACCECPT and IMMEDIATE CCBs */
 359         while ((atio = softc->accept_tio_list) != NULL) {
 360
 361                 softc->accept_tio_list =
 362                     ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link;
 363                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 364                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 365                 ccb.cab.abort_ccb = (union ccb *)atio;
 366                 xpt_action(&ccb);
 367         }
 368
 369         while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) {
 370                 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle);
 371                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 372                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 373                 ccb.cab.abort_ccb = (union ccb *)ccb_h;
 374                 xpt_action(&ccb);
 375         }
 376
 377         /*
 378          * Dissable this lun.
 379          */
 380         xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 381         ccb.cel.ccb_h.func_code = XPT_EN_LUN;
 382         ccb.cel.enable = 0;
 383         xpt_action(&ccb);
 384
 385         if (ccb.cel.ccb_h.status != CAM_REQ_CMP)
 386                 printf("targbhdislun - Disabling lun on controller failed "
 387                        "with status 0x%x\n", ccb.cel.ccb_h.status);
 388         else
 389                 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED;
 390         return (ccb.cel.ccb_h.status);
 391 }
 392
 393 static cam_status
 394 targbhctor(struct cam_periph *periph, void *arg)
 395 {
 396         struct targbh_softc *softc;
 397
 398         /* Allocate our per-instance private storage */
 399         softc = (struct targbh_softc *)malloc(sizeof(*softc),
 400                                               M_SCSIBH, M_NOWAIT);
 401         if (softc == NULL) {
 402                 printf("targctor: unable to malloc softc\n");
 403                 return (CAM_REQ_CMP_ERR);
 404         }
 405
 406         bzero(softc, sizeof(*softc));
 407         TAILQ_INIT(&softc->pending_queue);
 408         TAILQ_INIT(&softc->work_queue);
 409         softc->accept_tio_list = NULL;
 410         SLIST_INIT(&softc->immed_notify_slist);
 411         softc->state = TARGBH_STATE_NORMAL;
 412         periph->softc = softc;
 413         softc->init_level++;
 414
 415         if (targbhenlun(periph) != CAM_REQ_CMP)
 416                 cam_periph_invalidate(periph);
 417         return (CAM_REQ_CMP);
 418 }
 419
 420 static void
 421 targbhdtor(struct cam_periph *periph)
 422 {
 423         struct targbh_softc *softc;
 424
 425         softc = (struct targbh_softc *)periph->softc;
 426
 427         softc->state = TARGBH_STATE_TEARDOWN;
 428
 429         targbhdislun(periph);
 430
 431         switch (softc->init_level) {
 432         case 0:
 433                 panic("targdtor - impossible init level");
 434         case 1:
 435                 /* FALLTHROUGH */
 436         default:
 437                 /* XXX Wait for callback of targbhdislun() */
 438                 cam_periph_sleep(periph, softc, PRIBIO, "targbh", hz/2);
 439                 free(softc, M_SCSIBH);
 440                 break;
 441         }
 442 }
 443
 444 static void
 445 targbhstart(struct cam_periph *periph, union ccb *start_ccb)
 446 {
 447         struct targbh_softc *softc;
 448         struct ccb_hdr *ccbh;
 449         struct ccb_accept_tio *atio;
 450         struct targbh_cmd_desc *desc;
 451         struct ccb_scsiio *csio;
 452         ccb_flags flags;
 453
 454         softc = (struct targbh_softc *)periph->softc;
 455
 456         ccbh = TAILQ_FIRST(&softc->work_queue);
 457         if (ccbh == NULL) {
 458                 xpt_release_ccb(start_ccb);
 459         } else {
 460                 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe);
 461                 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh,
 462                                   periph_links.tqe);
 463                 atio = (struct ccb_accept_tio*)ccbh;
 464                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 465
 466                 /* Is this a tagged request? */
 467                 flags = atio->ccb_h.flags &
 468                     (CAM_DIS_DISCONNECT|CAM_TAG_ACTION_VALID|CAM_DIR_MASK);
 469
 470                 csio = &start_ccb->csio;
 471                 /*
 472                  * If we are done with the transaction, tell the
 473                  * controller to send status and perform a CMD_CMPLT.
 474                  * If we have associated sense data, see if we can
 475                  * send that too.
 476                  */
 477                 if (desc->data_resid == desc->data_increment) {
 478                         flags |= CAM_SEND_STATUS;
 479                         if (atio->sense_len) {
 480                                 csio->sense_len = atio->sense_len;
 481                                 csio->sense_data = atio->sense_data;
 482                                 flags |= CAM_SEND_SENSE;
 483                         }
 484                 }
 485
 486                 cam_fill_ctio(csio,
 487                               /*retries*/2,
 488                               targbhdone,
 489                               flags,
 490                               (flags & CAM_TAG_ACTION_VALID)?
 491                                 MSG_SIMPLE_Q_TAG : 0,
 492                               atio->tag_id,
 493                               atio->init_id,
 494                               desc->status,
 495                               /*data_ptr*/desc->data_increment == 0
 496                                           ? NULL : desc->data,
 497                               /*dxfer_len*/desc->data_increment,
 498                               /*timeout*/desc->timeout);
 499
 500                 /* Override our wildcard attachment */
 501                 start_ccb->ccb_h.target_id = atio->ccb_h.target_id;
 502                 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun;
 503
 504                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ;
 505                 start_ccb->ccb_h.ccb_atio = atio;
 506                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 507                           ("Sending a CTIO\n"));
 508                 xpt_action(start_ccb);
 509                 /*
 510                  * If the queue was frozen waiting for the response
 511                  * to this ATIO (for instance disconnection was disallowed),
 512                  * then release it now that our response has been queued.
 513                  */
 514                 if ((atio->ccb_h.status & CAM_DEV_QFRZN) != 0) {
 515                         cam_release_devq(periph->path,
 516                                          /*relsim_flags*/0,
 517                                          /*reduction*/0,
 518                                          /*timeout*/0,
 519                                          /*getcount_only*/0);
 520                         atio->ccb_h.status &= ~CAM_DEV_QFRZN;
 521                 }
 522                 ccbh = TAILQ_FIRST(&softc->work_queue);
 523         }
 524         if (ccbh != NULL)
 525                 xpt_schedule(periph, CAM_PRIORITY_NORMAL);
 526 }
 527
 528 static void
 529 targbhdone(struct cam_periph *periph, union ccb *done_ccb)
 530 {
 531         struct targbh_softc *softc;
 532
 533         softc = (struct targbh_softc *)periph->softc;
 534
 535         switch (done_ccb->ccb_h.func_code) {
 536         case XPT_ACCEPT_TARGET_IO:
 537         {
 538                 struct ccb_accept_tio *atio;
 539                 struct targbh_cmd_desc *descr;
 540                 u_int8_t *cdb;
 541                 int priority;
 542
 543                 atio = &done_ccb->atio;
 544                 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr;
 545                 cdb = atio->cdb_io.cdb_bytes;
 546                 if (softc->state == TARGBH_STATE_TEARDOWN
 547                  || atio->ccb_h.status == CAM_REQ_ABORTED) {
 548                         targbhfreedescr(descr);
 549                         xpt_free_ccb(done_ccb);
 550                         return;
 551                 }
 552
 553                 /*
 554                  * Determine the type of incoming command and
 555                  * setup our buffer for a response.
 556                  */
 557                 switch (cdb[0]) {
 558                 case INQUIRY:
 559                 {
 560                         struct scsi_inquiry *inq;
 561
 562                         inq = (struct scsi_inquiry *)cdb;
 563                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 564                                   ("Saw an inquiry!\n"));
 565                         /*
 566                          * Validate the command.  We don't
 567                          * support any VPD pages, so complain
 568                          * if EVPD is set.
 569                          */
 570                         if ((inq->byte2 & SI_EVPD) != 0
 571                          || inq->page_code != 0) {
 572                                 atio->ccb_h.flags &= ~CAM_DIR_MASK;
 573                                 atio->ccb_h.flags |= CAM_DIR_NONE;
 574                                 /*
 575                                  * This needs to have other than a
 576                                  * no_lun_sense_data response.
 577                                  */
 578                                 bcopy(&no_lun_sense_data, &atio->sense_data,
 579                                       min(sizeof(no_lun_sense_data),
 580                                           sizeof(atio->sense_data)));
 581                                 atio->sense_len = sizeof(no_lun_sense_data);
 582                                 descr->data_resid = 0;
 583                                 descr->data_increment = 0;
 584                                 descr->status = SCSI_STATUS_CHECK_COND;
 585                                 break;
 586                         }
 587                         /*
 588                          * Direction is always relative
 589                          * to the initator.
 590                          */
 591                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 592                         atio->ccb_h.flags |= CAM_DIR_IN;
 593                         descr->data = &no_lun_inq_data;
 594                         descr->data_resid = MIN(sizeof(no_lun_inq_data),
 595                                                 scsi_2btoul(inq->length));
 596                         descr->data_increment = descr->data_resid;
 597                         descr->timeout = 5 * 1000;
 598                         descr->status = SCSI_STATUS_OK;
 599                         break;
 600                 }
 601                 case REQUEST_SENSE:
 602                 {
 603                         struct scsi_request_sense *rsense;
 604
 605                         rsense = (struct scsi_request_sense *)cdb;
 606                         /* Refer to static sense data */
 607                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 608                         atio->ccb_h.flags |= CAM_DIR_IN;
 609                         descr->data = &no_lun_sense_data;
 610                         descr->data_resid = request_sense_size;
 611                         descr->data_resid = MIN(descr->data_resid,
 612                                                 SCSI_CDB6_LEN(rsense->length));
 613                         descr->data_increment = descr->data_resid;
 614                         descr->timeout = 5 * 1000;
 615                         descr->status = SCSI_STATUS_OK;
 616                         break;
 617                 }
 618                 default:
 619                         /* Constant CA, tell initiator */
 620                         /* Direction is always relative to the initator */
 621                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 622                         atio->ccb_h.flags |= CAM_DIR_NONE;
 623                         bcopy(&no_lun_sense_data, &atio->sense_data,
 624                               min(sizeof(no_lun_sense_data),
 625                                   sizeof(atio->sense_data)));
 626                         atio->sense_len = sizeof (no_lun_sense_data);
 627                         descr->data_resid = 0;
 628                         descr->data_increment = 0;
 629                         descr->timeout = 5 * 1000;
 630                         descr->status = SCSI_STATUS_CHECK_COND;
 631                         break;
 632                 }
 633
 634                 /* Queue us up to receive a Continue Target I/O ccb. */
 635                 if ((atio->ccb_h.flags & CAM_DIS_DISCONNECT) != 0) {
 636                         TAILQ_INSERT_HEAD(&softc->work_queue, &atio->ccb_h,
 637                                           periph_links.tqe);
 638                         priority = 0;
 639                 } else {
 640                         TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h,
 641                                           periph_links.tqe);
 642                         priority = CAM_PRIORITY_NORMAL;
 643                 }
 644                 xpt_schedule(periph, priority);
 645                 break;
 646         }
 647         case XPT_CONT_TARGET_IO:
 648         {
 649                 struct ccb_accept_tio *atio;
 650                 struct targbh_cmd_desc *desc;
 651
 652                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 653                           ("Received completed CTIO\n"));
 654                 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio;
 655                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 656
 657                 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h,
 658                              periph_links.tqe);
 659
 660                 /*
 661                  * We could check for CAM_SENT_SENSE bein set here,
 662                  * but since we're not maintaining any CA/UA state,
 663                  * there's no point.
 664                  */
 665                 atio->sense_len = 0;
 666                 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE;
 667                 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE;
 668
 669                 /*
 670                  * Any errors will not change the data we return,
 671                  * so make sure the queue is not left frozen.
 672                  * XXX - At some point there may be errors that
 673                  *       leave us in a connected state with the
 674                  *       initiator...
 675                  */
 676                 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
 677                         printf("Releasing Queue\n");
 678                         cam_release_devq(done_ccb->ccb_h.path,
 679                                          /*relsim_flags*/0,
 680                                          /*reduction*/0,
 681                                          /*timeout*/0,
 682                                          /*getcount_only*/0);
 683                         done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
 684                 }
 685                 desc->data_resid -= desc->data_increment;
 686                 xpt_release_ccb(done_ccb);
 687                 if (softc->state != TARGBH_STATE_TEARDOWN) {
 688                         /*
 689                          * Send the original accept TIO back to the
 690                          * controller to handle more work.
 691                          */
 692                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 693                                   ("Returning ATIO to target\n"));
 694                         /* Restore wildcards */
 695                         atio->ccb_h.target_id = CAM_TARGET_WILDCARD;
 696                         atio->ccb_h.target_lun = CAM_LUN_WILDCARD;
 697                         xpt_action((union ccb *)atio);
 698                         break;
 699                 } else {
 700                         targbhfreedescr(desc);
 701                         free(atio, M_SCSIBH);
 702                 }
 703                 break;
 704         }
 705         case XPT_IMMEDIATE_NOTIFY:
 706         {
 707                 int frozen;
 708
 709                 frozen = (done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0;
 710                 if (softc->state == TARGBH_STATE_TEARDOWN
 711                  || done_ccb->ccb_h.status == CAM_REQ_ABORTED) {
 712                         printf("Freed an immediate notify\n");
 713                         xpt_free_ccb(done_ccb);
 714                 } else {
 715                         /* Requeue for another immediate event */
 716                         xpt_action(done_ccb);
 717                 }
 718                 if (frozen != 0)
 719                         cam_release_devq(periph->path,
 720                                          /*relsim_flags*/0,
 721                                          /*opening reduction*/0,
 722                                          /*timeout*/0,
 723                                          /*getcount_only*/0);
 724                 break;
 725         }
 726         default:
 727                 panic("targbhdone: Unexpected ccb opcode");
 728                 break;
 729         }
 730 }
 731
 732 #ifdef NOTYET
 733 static int
 734 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
 735 {
 736         return 0;
 737 }
 738 #endif
 739
 740 static struct targbh_cmd_desc*
 741 targbhallocdescr(void)
 742 {
 743         struct targbh_cmd_desc* descr;
 744
 745         /* Allocate the targbh_descr structure */
 746         descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr),
 747                                                M_SCSIBH, M_NOWAIT);
 748         if (descr == NULL)
 749                 return (NULL);
 750
 751         bzero(descr, sizeof(*descr));
 752
 753         /* Allocate buffer backing store */
 754         descr->backing_store = malloc(MAX_BUF_SIZE, M_SCSIBH, M_NOWAIT);
 755         if (descr->backing_store == NULL) {
 756                 free(descr, M_SCSIBH);
 757                 return (NULL);
 758         }
 759         descr->max_size = MAX_BUF_SIZE;
 760         return (descr);
 761 }
 762
 763 static void
 764 targbhfreedescr(struct targbh_cmd_desc *descr)
 765 {
 766         free(descr->backing_store, M_SCSIBH);
 767         free(descr, M_SCSIBH);
 768 }