sys/bus/cam/scsi/scsi_targ_bh.c

   1 /*
   2  * Implementation of the Target Mode 'Black Hole device' for CAM.
   3  *
   4  * Copyright (c) 1999 Justin T. Gibbs.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification, immediately at the beginning of the file.
  13  * 2. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  *
  28  * $FreeBSD: src/sys/cam/scsi/scsi_targ_bh.c,v 1.4.2.5 2001/07/30 00:15:22 mjacob Exp $
  29  */
  30 #include <sys/param.h>
  31 #include <sys/queue.h>
  32 #include <sys/systm.h>
  33 #include <sys/kernel.h>
  34 #include <sys/types.h>
  35 #include <sys/buf.h>
  36 #include <sys/conf.h>
  37 #include <sys/devicestat.h>
  38 #include <sys/malloc.h>
  39 #include <sys/uio.h>
  40
  41 #include <cam/cam.h>
  42 #include <cam/cam_ccb.h>
  43 #include <cam/cam_extend.h>
  44 #include <cam/cam_periph.h>
  45 #include <cam/cam_queue.h>
  46 #include <cam/cam_xpt_periph.h>
  47 #include <cam/cam_debug.h>
  48
  49 #include <cam/scsi/scsi_all.h>
  50 #include <cam/scsi/scsi_message.h>
  51
  52 typedef enum {
  53         TARGBH_STATE_NORMAL,
  54         TARGBH_STATE_EXCEPTION,
  55         TARGBH_STATE_TEARDOWN
  56 } targbh_state;
  57
  58 typedef enum {
  59         TARGBH_FLAG_NONE         = 0x00,
  60         TARGBH_FLAG_LUN_ENABLED  = 0x01
  61 } targbh_flags;
  62
  63 typedef enum {
  64         TARGBH_CCB_WORKQ,
  65         TARGBH_CCB_WAITING
  66 } targbh_ccb_types;
  67
  68 #define MAX_ACCEPT      8
  69 #define MAX_IMMEDIATE   16
  70 #define MAX_BUF_SIZE    256     /* Max inquiry/sense/mode page transfer */
  71
  72 #define MIN(a, b) ((a > b) ? b : a)
  73
  74 /* Offsets into our private CCB area for storing accept information */
  75 #define ccb_type        ppriv_field0
  76 #define ccb_descr       ppriv_ptr1
  77
  78 /* We stick a pointer to the originating accept TIO in each continue I/O CCB */
  79 #define ccb_atio        ppriv_ptr1
  80
  81 TAILQ_HEAD(ccb_queue, ccb_hdr);
  82
  83 struct targbh_softc {
  84         struct          ccb_queue pending_queue;
  85         struct          ccb_queue work_queue;
  86         struct          ccb_queue unknown_atio_queue;
  87         struct          devstat device_stats;
  88         targbh_state    state;
  89         targbh_flags    flags;
  90         u_int           init_level;
  91         u_int           inq_data_len;
  92         struct          ccb_accept_tio *accept_tio_list;
  93         struct          ccb_hdr_slist immed_notify_slist;
  94 };
  95
  96 struct targbh_cmd_desc {
  97         struct    ccb_accept_tio* atio_link;
  98         u_int     data_resid;   /* How much left to transfer */
  99         u_int     data_increment;/* Amount to send before next disconnect */
 100         void*     data;         /* The data. Can be from backing_store or not */
 101         void*     backing_store;/* Backing store allocated for this descriptor*/
 102         u_int     max_size;     /* Size of backing_store */
 103         u_int32_t timeout;
 104         u_int8_t  status;       /* Status to return to initiator */
 105 };
 106
 107 static struct scsi_inquiry_data no_lun_inq_data =
 108 {
 109         T_NODEVICE | (SID_QUAL_BAD_LU << 5), 0,
 110         /* version */2, /* format version */2
 111 };
 112
 113 static struct scsi_sense_data no_lun_sense_data =
 114 {
 115         SSD_CURRENT_ERROR|SSD_ERRCODE_VALID,
 116         0,
 117         SSD_KEY_NOT_READY,
 118         { 0, 0, 0, 0 },
 119         /*extra_len*/offsetof(struct scsi_sense_data, fru)
 120                    - offsetof(struct scsi_sense_data, extra_len),
 121         { 0, 0, 0, 0 },
 122         /* Logical Unit Not Supported */
 123         /*ASC*/0x25, /*ASCQ*/0
 124 };
 125
 126 static const int request_sense_size = offsetof(struct scsi_sense_data, fru);
 127
 128 static periph_init_t    targbhinit;
 129 static void             targbhasync(void *callback_arg, u_int32_t code,
 130                                     struct cam_path *path, void *arg);
 131 static cam_status       targbhenlun(struct cam_periph *periph);
 132 static cam_status       targbhdislun(struct cam_periph *periph);
 133 static periph_ctor_t    targbhctor;
 134 static periph_dtor_t    targbhdtor;
 135 static periph_start_t   targbhstart;
 136 static void             targbhdone(struct cam_periph *periph,
 137                                    union ccb *done_ccb);
 138 #ifdef NOTYET
 139 static  int             targbherror(union ccb *ccb, u_int32_t cam_flags,
 140                                     u_int32_t sense_flags);
 141 #endif
 142 static struct targbh_cmd_desc*  targbhallocdescr(void);
 143 static void             targbhfreedescr(struct targbh_cmd_desc *buf);
 144
 145 static struct periph_driver targbhdriver =
 146 {
 147         targbhinit, "targbh",
 148         TAILQ_HEAD_INITIALIZER(targbhdriver.units), /* generation */ 0
 149 };
 150
 151 DATA_SET(periphdriver_set, targbhdriver);
 152
 153 static void
 154 targbhinit(void)
 155 {
 156         cam_status status;
 157         struct cam_path *path;
 158
 159         /*
 160          * Install a global async callback.  This callback will
 161          * receive async callbacks like "new path registered".
 162          */
 163         status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
 164                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
 165
 166         if (status == CAM_REQ_CMP) {
 167                 struct ccb_setasync csa;
 168
 169                 xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5);
 170                 csa.ccb_h.func_code = XPT_SASYNC_CB;
 171                 csa.event_enable = AC_PATH_REGISTERED;
 172                 csa.callback = targbhasync;
 173                 csa.callback_arg = NULL;
 174                 xpt_action((union ccb *)&csa);
 175                 status = csa.ccb_h.status;
 176                 xpt_free_path(path);
 177         }
 178
 179         if (status != CAM_REQ_CMP) {
 180                 printf("targbh: Failed to attach master async callback "
 181                        "due to status 0x%x!\n", status);
 182         }
 183 }
 184
 185 static void
 186 targbhasync(void *callback_arg, u_int32_t code,
 187             struct cam_path *path, void *arg)
 188 {
 189         struct cam_periph *periph;
 190
 191         periph = (struct cam_periph *)callback_arg;
 192         switch (code) {
 193         case AC_PATH_REGISTERED:
 194         {
 195                 struct ccb_pathinq *cpi;
 196                 struct cam_path *new_path;
 197                 cam_status status;
 198
 199                 cpi = (struct ccb_pathinq *)arg;
 200
 201                 /* Only attach to controllers that support target mode */
 202                 if ((cpi->target_sprt & PIT_PROCESSOR) == 0)
 203                         break;
 204
 205                 /*
 206                  * Allocate a peripheral instance for
 207                  * this target instance.
 208                  */
 209                 status = xpt_create_path(&new_path, NULL,
 210                                          xpt_path_path_id(path),
 211                                          CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
 212                 if (status != CAM_REQ_CMP) {
 213                         printf("targbhasync: Unable to create path "
 214                                 "due to status 0x%x\n", status);
 215                         break;
 216                 }
 217                 status = cam_periph_alloc(targbhctor, NULL, targbhdtor,
 218                                           targbhstart,
 219                                           "targbh", CAM_PERIPH_BIO,
 220                                           new_path, targbhasync,
 221                                           AC_PATH_REGISTERED,
 222                                           cpi);
 223                 xpt_free_path(new_path);
 224                 if (status != CAM_REQ_CMP
 225                  && status != CAM_REQ_INPROG)
 226                         printf("targbhasync: Unable to allocate new periph "
 227                                "due to status 0x%x\n", status);
 228                 break;
 229         }
 230         case AC_PATH_DEREGISTERED:
 231         {
 232                 targbhdislun(periph);
 233                 break;
 234         }
 235         default:
 236                 break;
 237         }
 238 }
 239
 240 /* Attempt to enable our lun */
 241 static cam_status
 242 targbhenlun(struct cam_periph *periph)
 243 {
 244         union ccb immed_ccb;
 245         struct targbh_softc *softc;
 246         cam_status status;
 247         int i;
 248
 249         softc = (struct targbh_softc *)periph->softc;
 250
 251         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0)
 252                 return (CAM_REQ_CMP);
 253
 254         xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, /*priority*/1);
 255         immed_ccb.ccb_h.func_code = XPT_EN_LUN;
 256
 257         /* Don't need support for any vendor specific commands */
 258         immed_ccb.cel.grp6_len = 0;
 259         immed_ccb.cel.grp7_len = 0;
 260         immed_ccb.cel.enable = 1;
 261         xpt_action(&immed_ccb);
 262         status = immed_ccb.ccb_h.status;
 263         if (status != CAM_REQ_CMP) {
 264                 xpt_print_path(periph->path);
 265                 printf("targbhenlun - Enable Lun Rejected with status 0x%x\n",
 266                        status);
 267                 return (status);
 268         }
 269
 270         softc->flags |= TARGBH_FLAG_LUN_ENABLED;
 271
 272         /*
 273          * Build up a buffer of accept target I/O
 274          * operations for incoming selections.
 275          */
 276         for (i = 0; i < MAX_ACCEPT; i++) {
 277                 struct ccb_accept_tio *atio;
 278
 279                 atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_DEVBUF,
 280                                                       M_NOWAIT);
 281                 if (atio == NULL) {
 282                         status = CAM_RESRC_UNAVAIL;
 283                         break;
 284                 }
 285
 286                 atio->ccb_h.ccb_descr = targbhallocdescr();
 287
 288                 if (atio->ccb_h.ccb_descr == NULL) {
 289                         free(atio, M_DEVBUF);
 290                         status = CAM_RESRC_UNAVAIL;
 291                         break;
 292                 }
 293
 294                 xpt_setup_ccb(&atio->ccb_h, periph->path, /*priority*/1);
 295                 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO;
 296                 atio->ccb_h.cbfcnp = targbhdone;
 297                 xpt_action((union ccb *)atio);
 298                 status = atio->ccb_h.status;
 299                 if (status != CAM_REQ_INPROG) {
 300                         targbhfreedescr(atio->ccb_h.ccb_descr);
 301                         free(atio, M_DEVBUF);
 302                         break;
 303                 }
 304                 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link =
 305                     softc->accept_tio_list;
 306                 softc->accept_tio_list = atio;
 307         }
 308
 309         if (i == 0) {
 310                 xpt_print_path(periph->path);
 311                 printf("targbhenlun - Could not allocate accept tio CCBs: "
 312                        "status = 0x%x\n", status);
 313                 targbhdislun(periph);
 314                 return (CAM_REQ_CMP_ERR);
 315         }
 316
 317         /*
 318          * Build up a buffer of immediate notify CCBs
 319          * so the SIM can tell us of asynchronous target mode events.
 320          */
 321         for (i = 0; i < MAX_ACCEPT; i++) {
 322                 struct ccb_immed_notify *inot;
 323
 324                 inot = (struct ccb_immed_notify*)malloc(sizeof(*inot), M_DEVBUF,
 325                                                         M_NOWAIT);
 326
 327                 if (inot == NULL) {
 328                         status = CAM_RESRC_UNAVAIL;
 329                         break;
 330                 }
 331
 332                 xpt_setup_ccb(&inot->ccb_h, periph->path, /*priority*/1);
 333                 inot->ccb_h.func_code = XPT_IMMED_NOTIFY;
 334                 inot->ccb_h.cbfcnp = targbhdone;
 335                 xpt_action((union ccb *)inot);
 336                 status = inot->ccb_h.status;
 337                 if (status != CAM_REQ_INPROG) {
 338                         free(inot, M_DEVBUF);
 339                         break;
 340                 }
 341                 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h,
 342                                   periph_links.sle);
 343         }
 344
 345         if (i == 0) {
 346                 xpt_print_path(periph->path);
 347                 printf("targbhenlun - Could not allocate immediate notify "
 348                        "CCBs: status = 0x%x\n", status);
 349                 targbhdislun(periph);
 350                 return (CAM_REQ_CMP_ERR);
 351         }
 352
 353         return (CAM_REQ_CMP);
 354 }
 355
 356 static cam_status
 357 targbhdislun(struct cam_periph *periph)
 358 {
 359         union ccb ccb;
 360         struct targbh_softc *softc;
 361         struct ccb_accept_tio* atio;
 362         struct ccb_hdr *ccb_h;
 363
 364         softc = (struct targbh_softc *)periph->softc;
 365         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0)
 366                 return CAM_REQ_CMP;
 367
 368         /* XXX Block for Continue I/O completion */
 369
 370         /* Kill off all ACCECPT and IMMEDIATE CCBs */
 371         while ((atio = softc->accept_tio_list) != NULL) {
 372
 373                 softc->accept_tio_list =
 374                     ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link;
 375                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1);
 376                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 377                 ccb.cab.abort_ccb = (union ccb *)atio;
 378                 xpt_action(&ccb);
 379         }
 380
 381         while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) {
 382                 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle);
 383                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1);
 384                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 385                 ccb.cab.abort_ccb = (union ccb *)ccb_h;
 386                 xpt_action(&ccb);
 387         }
 388
 389         /*
 390          * Dissable this lun.
 391          */
 392         xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, /*priority*/1);
 393         ccb.cel.ccb_h.func_code = XPT_EN_LUN;
 394         ccb.cel.enable = 0;
 395         xpt_action(&ccb);
 396
 397         if (ccb.cel.ccb_h.status != CAM_REQ_CMP)
 398                 printf("targbhdislun - Disabling lun on controller failed "
 399                        "with status 0x%x\n", ccb.cel.ccb_h.status);
 400         else
 401                 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED;
 402         return (ccb.cel.ccb_h.status);
 403 }
 404
 405 static cam_status
 406 targbhctor(struct cam_periph *periph, void *arg)
 407 {
 408         struct ccb_pathinq *cpi;
 409         struct targbh_softc *softc;
 410
 411         cpi = (struct ccb_pathinq *)arg;
 412
 413         /* Allocate our per-instance private storage */
 414         softc = (struct targbh_softc *)malloc(sizeof(*softc),
 415                                               M_DEVBUF, M_NOWAIT);
 416         if (softc == NULL) {
 417                 printf("targctor: unable to malloc softc\n");
 418                 return (CAM_REQ_CMP_ERR);
 419         }
 420
 421         bzero(softc, sizeof(*softc));
 422         TAILQ_INIT(&softc->pending_queue);
 423         TAILQ_INIT(&softc->work_queue);
 424         softc->accept_tio_list = NULL;
 425         SLIST_INIT(&softc->immed_notify_slist);
 426         softc->state = TARGBH_STATE_NORMAL;
 427         periph->softc = softc;
 428         softc->init_level++;
 429
 430         return (targbhenlun(periph));
 431 }
 432
 433 static void
 434 targbhdtor(struct cam_periph *periph)
 435 {
 436         struct targbh_softc *softc;
 437
 438         softc = (struct targbh_softc *)periph->softc;
 439
 440         softc->state = TARGBH_STATE_TEARDOWN;
 441
 442         targbhdislun(periph);
 443
 444         switch (softc->init_level) {
 445         default:
 446                 /* FALLTHROUGH */
 447         case 1:
 448                 free(softc, M_DEVBUF);
 449                 break;
 450         case 0:
 451                 panic("targdtor - impossible init level");;
 452         }
 453 }
 454
 455 static void
 456 targbhstart(struct cam_periph *periph, union ccb *start_ccb)
 457 {
 458         struct targbh_softc *softc;
 459         struct ccb_hdr *ccbh;
 460         struct ccb_accept_tio *atio;
 461         struct targbh_cmd_desc *desc;
 462         struct ccb_scsiio *csio;
 463         ccb_flags flags;
 464         int    s;
 465
 466         softc = (struct targbh_softc *)periph->softc;
 467
 468         s = splbio();
 469         ccbh = TAILQ_FIRST(&softc->work_queue);
 470         if (periph->immediate_priority <= periph->pinfo.priority) {
 471                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WAITING;
 472                 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
 473                                   periph_links.sle);
 474                 periph->immediate_priority = CAM_PRIORITY_NONE;
 475                 splx(s);
 476                 wakeup(&periph->ccb_list);
 477         } else if (ccbh == NULL) {
 478                 splx(s);
 479                 xpt_release_ccb(start_ccb);
 480         } else {
 481                 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe);
 482                 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh,
 483                                   periph_links.tqe);
 484                 splx(s);
 485                 atio = (struct ccb_accept_tio*)ccbh;
 486                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 487
 488                 /* Is this a tagged request? */
 489                 flags = atio->ccb_h.flags & (CAM_TAG_ACTION_VALID|CAM_DIR_MASK);
 490
 491                 csio = &start_ccb->csio;
 492                 /*
 493                  * If we are done with the transaction, tell the
 494                  * controller to send status and perform a CMD_CMPLT.
 495                  * If we have associated sense data, see if we can
 496                  * send that too.
 497                  */
 498                 if (desc->data_resid == desc->data_increment) {
 499                         flags |= CAM_SEND_STATUS;
 500                         if (atio->sense_len) {
 501                                 csio->sense_len = atio->sense_len;
 502                                 csio->sense_data = atio->sense_data;
 503                                 flags |= CAM_SEND_SENSE;
 504                         }
 505
 506                 }
 507
 508                 cam_fill_ctio(csio,
 509                               /*retries*/2,
 510                               targbhdone,
 511                               flags,
 512                               (flags & CAM_TAG_ACTION_VALID)?
 513                                 MSG_SIMPLE_Q_TAG : 0,
 514                               atio->tag_id,
 515                               atio->init_id,
 516                               desc->status,
 517                               /*data_ptr*/desc->data_increment == 0
 518                                           ? NULL : desc->data,
 519                               /*dxfer_len*/desc->data_increment,
 520                               /*timeout*/desc->timeout);
 521
 522                 /* Override our wildcard attachment */
 523                 start_ccb->ccb_h.target_id = atio->ccb_h.target_id;
 524                 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun;
 525
 526                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ;
 527                 start_ccb->ccb_h.ccb_atio = atio;
 528                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 529                           ("Sending a CTIO\n"));
 530                 xpt_action(start_ccb);
 531                 s = splbio();
 532                 ccbh = TAILQ_FIRST(&softc->work_queue);
 533                 splx(s);
 534         }
 535         if (ccbh != NULL)
 536                 xpt_schedule(periph, /*priority*/1);
 537 }
 538
 539 static void
 540 targbhdone(struct cam_periph *periph, union ccb *done_ccb)
 541 {
 542         struct targbh_softc *softc;
 543
 544         softc = (struct targbh_softc *)periph->softc;
 545
 546         if (done_ccb->ccb_h.ccb_type == TARGBH_CCB_WAITING) {
 547                 /* Caller will release the CCB */
 548                 wakeup(&done_ccb->ccb_h.cbfcnp);
 549                 return;
 550         }
 551
 552         switch (done_ccb->ccb_h.func_code) {
 553         case XPT_ACCEPT_TARGET_IO:
 554         {
 555                 struct ccb_accept_tio *atio;
 556                 struct targbh_cmd_desc *descr;
 557                 u_int8_t *cdb;
 558
 559                 atio = &done_ccb->atio;
 560                 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr;
 561                 cdb = atio->cdb_io.cdb_bytes;
 562                 if (softc->state == TARGBH_STATE_TEARDOWN
 563                  || atio->ccb_h.status == CAM_REQ_ABORTED) {
 564                         targbhfreedescr(descr);
 565                         free(done_ccb, M_DEVBUF);
 566                         return;
 567                 }
 568
 569                 /*
 570                  * Determine the type of incoming command and
 571                  * setup our buffer for a response.
 572                  */
 573                 switch (cdb[0]) {
 574                 case INQUIRY:
 575                 {
 576                         struct scsi_inquiry *inq;
 577
 578                         inq = (struct scsi_inquiry *)cdb;
 579                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 580                                   ("Saw an inquiry!\n"));
 581                         /*
 582                          * Validate the command.  We don't
 583                          * support any VPD pages, so complain
 584                          * if EVPD is set.
 585                          */
 586                         if ((inq->byte2 & SI_EVPD) != 0
 587                          || inq->page_code != 0) {
 588                                 atio->ccb_h.flags &= ~CAM_DIR_MASK;
 589                                 atio->ccb_h.flags |= CAM_DIR_NONE;
 590                                 /*
 591                                  * This needs to have other than a
 592                                  * no_lun_sense_data response.
 593                                  */
 594                                 atio->sense_data = no_lun_sense_data;
 595                                 atio->sense_len = sizeof(no_lun_sense_data);
 596                                 descr->data_resid = 0;
 597                                 descr->data_increment = 0;
 598                                 descr->status = SCSI_STATUS_CHECK_COND;
 599                                 break;
 600                         }
 601                         /*
 602                          * Direction is always relative
 603                          * to the initator.
 604                          */
 605                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 606                         atio->ccb_h.flags |= CAM_DIR_IN;
 607                         descr->data = &no_lun_inq_data;
 608                         descr->data_resid = MIN(sizeof(no_lun_inq_data),
 609                                                 SCSI_CDB6_LEN(inq->length));
 610                         descr->data_increment = descr->data_resid;
 611                         descr->timeout = 5 * 1000;
 612                         descr->status = SCSI_STATUS_OK;
 613                         break;
 614                 }
 615                 case REQUEST_SENSE:
 616                 {
 617                         struct scsi_request_sense *rsense;
 618
 619                         rsense = (struct scsi_request_sense *)cdb;
 620                         /* Refer to static sense data */
 621                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 622                         atio->ccb_h.flags |= CAM_DIR_IN;
 623                         descr->data = &no_lun_sense_data;
 624                         descr->data_resid = request_sense_size;
 625                         descr->data_resid = MIN(descr->data_resid,
 626                                                 SCSI_CDB6_LEN(rsense->length));
 627                         descr->data_increment = descr->data_resid;
 628                         descr->timeout = 5 * 1000;
 629                         descr->status = SCSI_STATUS_OK;
 630                         break;
 631                 }
 632                 default:
 633                         /* Constant CA, tell initiator */
 634                         /* Direction is always relative to the initator */
 635                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 636                         atio->ccb_h.flags |= CAM_DIR_NONE;
 637                         atio->sense_data = no_lun_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                 TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h,
 648                                   periph_links.tqe);
 649                 xpt_schedule(periph, /*priority*/1);
 650                 break;
 651         }
 652         case XPT_CONT_TARGET_IO:
 653         {
 654                 struct ccb_accept_tio *atio;
 655                 struct targbh_cmd_desc *desc;
 656
 657                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 658                           ("Received completed CTIO\n"));
 659                 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio;
 660                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 661
 662                 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h,
 663                              periph_links.tqe);
 664
 665                 /*
 666                  * We could check for CAM_SENT_SENSE bein set here,
 667                  * but since we're not maintaining any CA/UA state,
 668                  * there's no point.
 669                  */
 670                 atio->sense_len = 0;
 671                 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE;
 672                 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE;
 673
 674                 /* XXX Check for errors */
 675                 desc->data_resid -= desc->data_increment;
 676                 xpt_release_ccb(done_ccb);
 677                 if (softc->state != TARGBH_STATE_TEARDOWN) {
 678
 679                         /*
 680                          * Send the original accept TIO back to the
 681                          * controller to handle more work.
 682                          */
 683                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 684                                   ("Returning ATIO to target\n"));
 685                         /* Restore wildcards */
 686                         atio->ccb_h.target_id = CAM_TARGET_WILDCARD;
 687                         atio->ccb_h.target_lun = CAM_LUN_WILDCARD;
 688                         xpt_action((union ccb *)atio);
 689                         break;
 690                 } else {
 691                         targbhfreedescr(desc);
 692                         free(atio, M_DEVBUF);
 693                 }
 694                 break;
 695         }
 696         case XPT_IMMED_NOTIFY:
 697         {
 698                 if (softc->state == TARGBH_STATE_TEARDOWN
 699                  || done_ccb->ccb_h.status == CAM_REQ_ABORTED) {
 700                         printf("Freed an immediate notify\n");
 701                         free(done_ccb, M_DEVBUF);
 702                 }
 703                 break;
 704         }
 705         default:
 706                 panic("targbhdone: Unexpected ccb opcode");
 707                 break;
 708         }
 709 }
 710
 711 #ifdef NOTYET
 712 static int
 713 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
 714 {
 715         return 0;
 716 }
 717 #endif
 718
 719 static struct targbh_cmd_desc*
 720 targbhallocdescr()
 721 {
 722         struct targbh_cmd_desc* descr;
 723
 724         /* Allocate the targbh_descr structure */
 725         descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr),
 726                                                M_DEVBUF, M_NOWAIT);
 727         if (descr == NULL)
 728                 return (NULL);
 729
 730         bzero(descr, sizeof(*descr));
 731
 732         /* Allocate buffer backing store */
 733         descr->backing_store = malloc(MAX_BUF_SIZE, M_DEVBUF, M_NOWAIT);
 734         if (descr->backing_store == NULL) {
 735                 free(descr, M_DEVBUF);
 736                 return (NULL);
 737         }
 738         descr->max_size = MAX_BUF_SIZE;
 739         return (descr);
 740 }
 741
 742 static void
 743 targbhfreedescr(struct targbh_cmd_desc *descr)
 744 {
 745         free(descr->backing_store, M_DEVBUF);
 746         free(descr, M_DEVBUF);
 747 }