sys/cam/scsi/scsi_targ_bh.c

   1 /*-
   2  * Implementation of the Target Mode 'Black Hole device' for CAM.
   3  *
   4  * Copyright (c) 1999 Justin T. Gibbs.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions, and the following disclaimer,
  12  *    without modification, immediately at the beginning of the file.
  13  * 2. The name of the author may not be used to endorse or promote products
  14  *    derived from this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
  20  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __FBSDID("$FreeBSD$");
  31
  32 #include <sys/param.h>
  33 #include <sys/queue.h>
  34 #include <sys/systm.h>
  35 #include <sys/kernel.h>
  36 #include <sys/types.h>
  37 #include <sys/bio.h>
  38 #include <sys/conf.h>
  39 #include <sys/devicestat.h>
  40 #include <sys/malloc.h>
  41 #include <sys/uio.h>
  42
  43 #include <cam/cam.h>
  44 #include <cam/cam_ccb.h>
  45 #include <cam/cam_periph.h>
  46 #include <cam/cam_queue.h>
  47 #include <cam/cam_xpt_periph.h>
  48 #include <cam/cam_debug.h>
  49 #include <cam/cam_sim.h>
  50
  51 #include <cam/scsi/scsi_all.h>
  52 #include <cam/scsi/scsi_message.h>
  53
  54 static MALLOC_DEFINE(M_SCSIBH, "SCSI bh", "SCSI blackhole buffers");
  55
  56 typedef enum {
  57         TARGBH_STATE_NORMAL,
  58         TARGBH_STATE_EXCEPTION,
  59         TARGBH_STATE_TEARDOWN
  60 } targbh_state;
  61
  62 typedef enum {
  63         TARGBH_FLAG_NONE         = 0x00,
  64         TARGBH_FLAG_LUN_ENABLED  = 0x01
  65 } targbh_flags;
  66
  67 typedef enum {
  68         TARGBH_CCB_WORKQ,
  69         TARGBH_CCB_WAITING
  70 } targbh_ccb_types;
  71
  72 #define MAX_ACCEPT      8
  73 #define MAX_IMMEDIATE   16
  74 #define MAX_BUF_SIZE    256     /* Max inquiry/sense/mode page transfer */
  75
  76 /* Offsets into our private CCB area for storing accept information */
  77 #define ccb_type        ppriv_field0
  78 #define ccb_descr       ppriv_ptr1
  79
  80 /* We stick a pointer to the originating accept TIO in each continue I/O CCB */
  81 #define ccb_atio        ppriv_ptr1
  82
  83 TAILQ_HEAD(ccb_queue, ccb_hdr);
  84
  85 struct targbh_softc {
  86         struct          ccb_queue pending_queue;
  87         struct          ccb_queue work_queue;
  88         struct          ccb_queue unknown_atio_queue;
  89         struct          devstat device_stats;
  90         targbh_state    state;
  91         targbh_flags    flags;
  92         u_int           init_level;
  93         u_int           inq_data_len;
  94         struct          ccb_accept_tio *accept_tio_list;
  95         struct          ccb_hdr_slist immed_notify_slist;
  96 };
  97
  98 struct targbh_cmd_desc {
  99         struct    ccb_accept_tio* atio_link;
 100         u_int     data_resid;   /* How much left to transfer */
 101         u_int     data_increment;/* Amount to send before next disconnect */
 102         void*     data;         /* The data. Can be from backing_store or not */
 103         void*     backing_store;/* Backing store allocated for this descriptor*/
 104         u_int     max_size;     /* Size of backing_store */
 105         u_int32_t timeout;
 106         u_int8_t  status;       /* Status to return to initiator */
 107 };
 108
 109 static struct scsi_inquiry_data no_lun_inq_data =
 110 {
 111         T_NODEVICE | (SID_QUAL_BAD_LU << 5), 0,
 112         /* version */2, /* format version */2
 113 };
 114
 115 static struct scsi_sense_data_fixed no_lun_sense_data =
 116 {
 117         SSD_CURRENT_ERROR|SSD_ERRCODE_VALID,
 118         0,
 119         SSD_KEY_NOT_READY,
 120         { 0, 0, 0, 0 },
 121         /*extra_len*/offsetof(struct scsi_sense_data_fixed, fru)
 122                    - offsetof(struct scsi_sense_data_fixed, extra_len),
 123         { 0, 0, 0, 0 },
 124         /* Logical Unit Not Supported */
 125         /*ASC*/0x25, /*ASCQ*/0
 126 };
 127
 128 static const int request_sense_size = offsetof(struct scsi_sense_data_fixed, fru);
 129
 130 static periph_init_t    targbhinit;
 131 static void             targbhasync(void *callback_arg, u_int32_t code,
 132                                     struct cam_path *path, void *arg);
 133 static cam_status       targbhenlun(struct cam_periph *periph);
 134 static cam_status       targbhdislun(struct cam_periph *periph);
 135 static periph_ctor_t    targbhctor;
 136 static periph_dtor_t    targbhdtor;
 137 static periph_start_t   targbhstart;
 138 static void             targbhdone(struct cam_periph *periph,
 139                                    union ccb *done_ccb);
 140 #ifdef NOTYET
 141 static  int             targbherror(union ccb *ccb, u_int32_t cam_flags,
 142                                     u_int32_t sense_flags);
 143 #endif
 144 static struct targbh_cmd_desc*  targbhallocdescr(void);
 145 static void             targbhfreedescr(struct targbh_cmd_desc *buf);
 146
 147 static struct periph_driver targbhdriver =
 148 {
 149         targbhinit, "targbh",
 150         TAILQ_HEAD_INITIALIZER(targbhdriver.units), /* generation */ 0
 151 };
 152
 153 PERIPHDRIVER_DECLARE(targbh, targbhdriver);
 154
 155 static void
 156 targbhinit(void)
 157 {
 158         cam_status status;
 159
 160         /*
 161          * Install a global async callback.  This callback will
 162          * receive async callbacks like "new path registered".
 163          */
 164         status = xpt_register_async(AC_PATH_REGISTERED | AC_PATH_DEREGISTERED,
 165                                     targbhasync, NULL, NULL);
 166
 167         if (status != CAM_REQ_CMP) {
 168                 printf("targbh: Failed to attach master async callback "
 169                        "due to status 0x%x!\n", status);
 170         }
 171 }
 172
 173 static void
 174 targbhasync(void *callback_arg, u_int32_t code,
 175             struct cam_path *path, void *arg)
 176 {
 177         struct cam_path *new_path;
 178         struct ccb_pathinq *cpi;
 179         path_id_t bus_path_id;
 180         cam_status status;
 181
 182         cpi = (struct ccb_pathinq *)arg;
 183         if (code == AC_PATH_REGISTERED)
 184                 bus_path_id = cpi->ccb_h.path_id;
 185         else
 186                 bus_path_id = xpt_path_path_id(path);
 187         /*
 188          * Allocate a peripheral instance for
 189          * this target instance.
 190          */
 191         status = xpt_create_path(&new_path, NULL,
 192                                  bus_path_id,
 193                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
 194         if (status != CAM_REQ_CMP) {
 195                 printf("targbhasync: Unable to create path "
 196                         "due to status 0x%x\n", status);
 197                 return;
 198         }
 199
 200         switch (code) {
 201         case AC_PATH_REGISTERED:
 202         {
 203                 /* Only attach to controllers that support target mode */
 204                 if ((cpi->target_sprt & PIT_PROCESSOR) == 0)
 205                         break;
 206
 207                 status = cam_periph_alloc(targbhctor, NULL, targbhdtor,
 208                                           targbhstart,
 209                                           "targbh", CAM_PERIPH_BIO,
 210                                           new_path, targbhasync,
 211                                           AC_PATH_REGISTERED,
 212                                           cpi);
 213                 break;
 214         }
 215         case AC_PATH_DEREGISTERED:
 216         {
 217                 struct cam_periph *periph;
 218
 219                 if ((periph = cam_periph_find(new_path, "targbh")) != NULL)
 220                         cam_periph_invalidate(periph);
 221                 break;
 222         }
 223         default:
 224                 break;
 225         }
 226         xpt_free_path(new_path);
 227 }
 228
 229 /* Attempt to enable our lun */
 230 static cam_status
 231 targbhenlun(struct cam_periph *periph)
 232 {
 233         union ccb immed_ccb;
 234         struct targbh_softc *softc;
 235         cam_status status;
 236         int i;
 237
 238         softc = (struct targbh_softc *)periph->softc;
 239
 240         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0)
 241                 return (CAM_REQ_CMP);
 242
 243         xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 244         immed_ccb.ccb_h.func_code = XPT_EN_LUN;
 245
 246         /* Don't need support for any vendor specific commands */
 247         immed_ccb.cel.grp6_len = 0;
 248         immed_ccb.cel.grp7_len = 0;
 249         immed_ccb.cel.enable = 1;
 250         xpt_action(&immed_ccb);
 251         status = immed_ccb.ccb_h.status;
 252         if (status != CAM_REQ_CMP) {
 253                 xpt_print(periph->path,
 254                     "targbhenlun - Enable Lun Rejected with status 0x%x\n",
 255                     status);
 256                 return (status);
 257         }
 258
 259         softc->flags |= TARGBH_FLAG_LUN_ENABLED;
 260
 261         /*
 262          * Build up a buffer of accept target I/O
 263          * operations for incoming selections.
 264          */
 265         for (i = 0; i < MAX_ACCEPT; i++) {
 266                 struct ccb_accept_tio *atio;
 267
 268                 atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_SCSIBH,
 269                                                       M_NOWAIT);
 270                 if (atio == NULL) {
 271                         status = CAM_RESRC_UNAVAIL;
 272                         break;
 273                 }
 274
 275                 atio->ccb_h.ccb_descr = targbhallocdescr();
 276
 277                 if (atio->ccb_h.ccb_descr == NULL) {
 278                         free(atio, M_SCSIBH);
 279                         status = CAM_RESRC_UNAVAIL;
 280                         break;
 281                 }
 282
 283                 xpt_setup_ccb(&atio->ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 284                 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO;
 285                 atio->ccb_h.cbfcnp = targbhdone;
 286                 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link =
 287                     softc->accept_tio_list;
 288                 softc->accept_tio_list = atio;
 289                 xpt_action((union ccb *)atio);
 290                 status = atio->ccb_h.status;
 291                 if (status != CAM_REQ_INPROG)
 292                         break;
 293         }
 294
 295         if (i == 0) {
 296                 xpt_print(periph->path,
 297                     "targbhenlun - Could not allocate accept tio CCBs: status "
 298                     "= 0x%x\n", status);
 299                 targbhdislun(periph);
 300                 return (CAM_REQ_CMP_ERR);
 301         }
 302
 303         /*
 304          * Build up a buffer of immediate notify CCBs
 305          * so the SIM can tell us of asynchronous target mode events.
 306          */
 307         for (i = 0; i < MAX_ACCEPT; i++) {
 308                 struct ccb_immediate_notify *inot;
 309
 310                 inot = (struct ccb_immediate_notify*)malloc(sizeof(*inot),
 311                             M_SCSIBH, M_NOWAIT);
 312
 313                 if (inot == NULL) {
 314                         status = CAM_RESRC_UNAVAIL;
 315                         break;
 316                 }
 317
 318                 xpt_setup_ccb(&inot->ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 319                 inot->ccb_h.func_code = XPT_IMMEDIATE_NOTIFY;
 320                 inot->ccb_h.cbfcnp = targbhdone;
 321                 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h,
 322                                   periph_links.sle);
 323                 xpt_action((union ccb *)inot);
 324                 status = inot->ccb_h.status;
 325                 if (status != CAM_REQ_INPROG)
 326                         break;
 327         }
 328
 329         if (i == 0) {
 330                 xpt_print(periph->path,
 331                     "targbhenlun - Could not allocate immediate notify "
 332                     "CCBs: status = 0x%x\n", status);
 333                 targbhdislun(periph);
 334                 return (CAM_REQ_CMP_ERR);
 335         }
 336
 337         return (CAM_REQ_CMP);
 338 }
 339
 340 static cam_status
 341 targbhdislun(struct cam_periph *periph)
 342 {
 343         union ccb ccb;
 344         struct targbh_softc *softc;
 345         struct ccb_accept_tio* atio;
 346         struct ccb_hdr *ccb_h;
 347
 348         softc = (struct targbh_softc *)periph->softc;
 349         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0)
 350                 return CAM_REQ_CMP;
 351
 352         /* XXX Block for Continue I/O completion */
 353
 354         /* Kill off all ACCECPT and IMMEDIATE CCBs */
 355         while ((atio = softc->accept_tio_list) != NULL) {
 356
 357                 softc->accept_tio_list =
 358                     ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link;
 359                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 360                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 361                 ccb.cab.abort_ccb = (union ccb *)atio;
 362                 xpt_action(&ccb);
 363         }
 364
 365         while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) {
 366                 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle);
 367                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 368                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 369                 ccb.cab.abort_ccb = (union ccb *)ccb_h;
 370                 xpt_action(&ccb);
 371         }
 372
 373         /*
 374          * Dissable this lun.
 375          */
 376         xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, CAM_PRIORITY_NORMAL);
 377         ccb.cel.ccb_h.func_code = XPT_EN_LUN;
 378         ccb.cel.enable = 0;
 379         xpt_action(&ccb);
 380
 381         if (ccb.cel.ccb_h.status != CAM_REQ_CMP)
 382                 printf("targbhdislun - Disabling lun on controller failed "
 383                        "with status 0x%x\n", ccb.cel.ccb_h.status);
 384         else
 385                 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED;
 386         return (ccb.cel.ccb_h.status);
 387 }
 388
 389 static cam_status
 390 targbhctor(struct cam_periph *periph, void *arg)
 391 {
 392         struct targbh_softc *softc;
 393
 394         /* Allocate our per-instance private storage */
 395         softc = (struct targbh_softc *)malloc(sizeof(*softc),
 396                                               M_SCSIBH, M_NOWAIT);
 397         if (softc == NULL) {
 398                 printf("targctor: unable to malloc softc\n");
 399                 return (CAM_REQ_CMP_ERR);
 400         }
 401
 402         bzero(softc, sizeof(*softc));
 403         TAILQ_INIT(&softc->pending_queue);
 404         TAILQ_INIT(&softc->work_queue);
 405         softc->accept_tio_list = NULL;
 406         SLIST_INIT(&softc->immed_notify_slist);
 407         softc->state = TARGBH_STATE_NORMAL;
 408         periph->softc = softc;
 409         softc->init_level++;
 410
 411         if (targbhenlun(periph) != CAM_REQ_CMP)
 412                 cam_periph_invalidate(periph);
 413         return (CAM_REQ_CMP);
 414 }
 415
 416 static void
 417 targbhdtor(struct cam_periph *periph)
 418 {
 419         struct targbh_softc *softc;
 420
 421         softc = (struct targbh_softc *)periph->softc;
 422
 423         softc->state = TARGBH_STATE_TEARDOWN;
 424
 425         targbhdislun(periph);
 426
 427         switch (softc->init_level) {
 428         case 0:
 429                 panic("targdtor - impossible init level");
 430         case 1:
 431                 /* FALLTHROUGH */
 432         default:
 433                 /* XXX Wait for callback of targbhdislun() */
 434                 msleep(softc, periph->sim->mtx, PRIBIO, "targbh", hz/2);
 435                 free(softc, M_SCSIBH);
 436                 break;
 437         }
 438 }
 439
 440 static void
 441 targbhstart(struct cam_periph *periph, union ccb *start_ccb)
 442 {
 443         struct targbh_softc *softc;
 444         struct ccb_hdr *ccbh;
 445         struct ccb_accept_tio *atio;
 446         struct targbh_cmd_desc *desc;
 447         struct ccb_scsiio *csio;
 448         ccb_flags flags;
 449
 450         softc = (struct targbh_softc *)periph->softc;
 451
 452         ccbh = TAILQ_FIRST(&softc->work_queue);
 453         if (periph->immediate_priority <= periph->pinfo.priority) {
 454                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WAITING;
 455                 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
 456                                   periph_links.sle);
 457                 periph->immediate_priority = CAM_PRIORITY_NONE;
 458                 wakeup(&periph->ccb_list);
 459         } else if (ccbh == NULL) {
 460                 xpt_release_ccb(start_ccb);
 461         } else {
 462                 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe);
 463                 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh,
 464                                   periph_links.tqe);
 465                 atio = (struct ccb_accept_tio*)ccbh;
 466                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 467
 468                 /* Is this a tagged request? */
 469                 flags = atio->ccb_h.flags &
 470                     (CAM_DIS_DISCONNECT|CAM_TAG_ACTION_VALID|CAM_DIR_MASK);
 471
 472                 csio = &start_ccb->csio;
 473                 /*
 474                  * If we are done with the transaction, tell the
 475                  * controller to send status and perform a CMD_CMPLT.
 476                  * If we have associated sense data, see if we can
 477                  * send that too.
 478                  */
 479                 if (desc->data_resid == desc->data_increment) {
 480                         flags |= CAM_SEND_STATUS;
 481                         if (atio->sense_len) {
 482                                 csio->sense_len = atio->sense_len;
 483                                 csio->sense_data = atio->sense_data;
 484                                 flags |= CAM_SEND_SENSE;
 485                         }
 486
 487                 }
 488
 489                 cam_fill_ctio(csio,
 490                               /*retries*/2,
 491                               targbhdone,
 492                               flags,
 493                               (flags & CAM_TAG_ACTION_VALID)?
 494                                 MSG_SIMPLE_Q_TAG : 0,
 495                               atio->tag_id,
 496                               atio->init_id,
 497                               desc->status,
 498                               /*data_ptr*/desc->data_increment == 0
 499                                           ? NULL : desc->data,
 500                               /*dxfer_len*/desc->data_increment,
 501                               /*timeout*/desc->timeout);
 502
 503                 /* Override our wildcard attachment */
 504                 start_ccb->ccb_h.target_id = atio->ccb_h.target_id;
 505                 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun;
 506
 507                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ;
 508                 start_ccb->ccb_h.ccb_atio = atio;
 509                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 510                           ("Sending a CTIO\n"));
 511                 xpt_action(start_ccb);
 512                 /*
 513                  * If the queue was frozen waiting for the response
 514                  * to this ATIO (for instance disconnection was disallowed),
 515                  * then release it now that our response has been queued.
 516                  */
 517                 if ((atio->ccb_h.status & CAM_DEV_QFRZN) != 0) {
 518                         cam_release_devq(periph->path,
 519                                          /*relsim_flags*/0,
 520                                          /*reduction*/0,
 521                                          /*timeout*/0,
 522                                          /*getcount_only*/0);
 523                         atio->ccb_h.status &= ~CAM_DEV_QFRZN;
 524                 }
 525                 ccbh = TAILQ_FIRST(&softc->work_queue);
 526         }
 527         if (ccbh != NULL)
 528                 xpt_schedule(periph, CAM_PRIORITY_NORMAL);
 529 }
 530
 531 static void
 532 targbhdone(struct cam_periph *periph, union ccb *done_ccb)
 533 {
 534         struct targbh_softc *softc;
 535
 536         softc = (struct targbh_softc *)periph->softc;
 537
 538         if (done_ccb->ccb_h.ccb_type == TARGBH_CCB_WAITING) {
 539                 /* Caller will release the CCB */
 540                 wakeup(&done_ccb->ccb_h.cbfcnp);
 541                 return;
 542         }
 543
 544         switch (done_ccb->ccb_h.func_code) {
 545         case XPT_ACCEPT_TARGET_IO:
 546         {
 547                 struct ccb_accept_tio *atio;
 548                 struct targbh_cmd_desc *descr;
 549                 u_int8_t *cdb;
 550                 int priority;
 551
 552                 atio = &done_ccb->atio;
 553                 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr;
 554                 cdb = atio->cdb_io.cdb_bytes;
 555                 if (softc->state == TARGBH_STATE_TEARDOWN
 556                  || atio->ccb_h.status == CAM_REQ_ABORTED) {
 557                         targbhfreedescr(descr);
 558                         xpt_free_ccb(done_ccb);
 559                         return;
 560                 }
 561
 562                 /*
 563                  * Determine the type of incoming command and
 564                  * setup our buffer for a response.
 565                  */
 566                 switch (cdb[0]) {
 567                 case INQUIRY:
 568                 {
 569                         struct scsi_inquiry *inq;
 570
 571                         inq = (struct scsi_inquiry *)cdb;
 572                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 573                                   ("Saw an inquiry!\n"));
 574                         /*
 575                          * Validate the command.  We don't
 576                          * support any VPD pages, so complain
 577                          * if EVPD is set.
 578                          */
 579                         if ((inq->byte2 & SI_EVPD) != 0
 580                          || inq->page_code != 0) {
 581                                 atio->ccb_h.flags &= ~CAM_DIR_MASK;
 582                                 atio->ccb_h.flags |= CAM_DIR_NONE;
 583                                 /*
 584                                  * This needs to have other than a
 585                                  * no_lun_sense_data response.
 586                                  */
 587                                 bcopy(&no_lun_sense_data, &atio->sense_data,
 588                                       min(sizeof(no_lun_sense_data),
 589                                           sizeof(atio->sense_data)));
 590                                 atio->sense_len = sizeof(no_lun_sense_data);
 591                                 descr->data_resid = 0;
 592                                 descr->data_increment = 0;
 593                                 descr->status = SCSI_STATUS_CHECK_COND;
 594                                 break;
 595                         }
 596                         /*
 597                          * Direction is always relative
 598                          * to the initator.
 599                          */
 600                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 601                         atio->ccb_h.flags |= CAM_DIR_IN;
 602                         descr->data = &no_lun_inq_data;
 603                         descr->data_resid = MIN(sizeof(no_lun_inq_data),
 604                                                 scsi_2btoul(inq->length));
 605                         descr->data_increment = descr->data_resid;
 606                         descr->timeout = 5 * 1000;
 607                         descr->status = SCSI_STATUS_OK;
 608                         break;
 609                 }
 610                 case REQUEST_SENSE:
 611                 {
 612                         struct scsi_request_sense *rsense;
 613
 614                         rsense = (struct scsi_request_sense *)cdb;
 615                         /* Refer to static sense data */
 616                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 617                         atio->ccb_h.flags |= CAM_DIR_IN;
 618                         descr->data = &no_lun_sense_data;
 619                         descr->data_resid = request_sense_size;
 620                         descr->data_resid = MIN(descr->data_resid,
 621                                                 SCSI_CDB6_LEN(rsense->length));
 622                         descr->data_increment = descr->data_resid;
 623                         descr->timeout = 5 * 1000;
 624                         descr->status = SCSI_STATUS_OK;
 625                         break;
 626                 }
 627                 default:
 628                         /* Constant CA, tell initiator */
 629                         /* Direction is always relative to the initator */
 630                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 631                         atio->ccb_h.flags |= CAM_DIR_NONE;
 632                         bcopy(&no_lun_sense_data, &atio->sense_data,
 633                               min(sizeof(no_lun_sense_data),
 634                                   sizeof(atio->sense_data)));
 635                         atio->sense_len = sizeof (no_lun_sense_data);
 636                         descr->data_resid = 0;
 637                         descr->data_increment = 0;
 638                         descr->timeout = 5 * 1000;
 639                         descr->status = SCSI_STATUS_CHECK_COND;
 640                         break;
 641                 }
 642
 643                 /* Queue us up to receive a Continue Target I/O ccb. */
 644                 if ((atio->ccb_h.flags & CAM_DIS_DISCONNECT) != 0) {
 645                         TAILQ_INSERT_HEAD(&softc->work_queue, &atio->ccb_h,
 646                                           periph_links.tqe);
 647                         priority = 0;
 648                 } else {
 649                         TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h,
 650                                           periph_links.tqe);
 651                         priority = CAM_PRIORITY_NORMAL;
 652                 }
 653                 xpt_schedule(periph, priority);
 654                 break;
 655         }
 656         case XPT_CONT_TARGET_IO:
 657         {
 658                 struct ccb_accept_tio *atio;
 659                 struct targbh_cmd_desc *desc;
 660
 661                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 662                           ("Received completed CTIO\n"));
 663                 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio;
 664                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 665
 666                 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h,
 667                              periph_links.tqe);
 668
 669                 /*
 670                  * We could check for CAM_SENT_SENSE bein set here,
 671                  * but since we're not maintaining any CA/UA state,
 672                  * there's no point.
 673                  */
 674                 atio->sense_len = 0;
 675                 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE;
 676                 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE;
 677
 678                 /*
 679                  * Any errors will not change the data we return,
 680                  * so make sure the queue is not left frozen.
 681                  * XXX - At some point there may be errors that
 682                  *       leave us in a connected state with the
 683                  *       initiator...
 684                  */
 685                 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) {
 686                         printf("Releasing Queue\n");
 687                         cam_release_devq(done_ccb->ccb_h.path,
 688                                          /*relsim_flags*/0,
 689                                          /*reduction*/0,
 690                                          /*timeout*/0,
 691                                          /*getcount_only*/0);
 692                         done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN;
 693                 }
 694                 desc->data_resid -= desc->data_increment;
 695                 xpt_release_ccb(done_ccb);
 696                 if (softc->state != TARGBH_STATE_TEARDOWN) {
 697
 698                         /*
 699                          * Send the original accept TIO back to the
 700                          * controller to handle more work.
 701                          */
 702                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 703                                   ("Returning ATIO to target\n"));
 704                         /* Restore wildcards */
 705                         atio->ccb_h.target_id = CAM_TARGET_WILDCARD;
 706                         atio->ccb_h.target_lun = CAM_LUN_WILDCARD;
 707                         xpt_action((union ccb *)atio);
 708                         break;
 709                 } else {
 710                         targbhfreedescr(desc);
 711                         free(atio, M_SCSIBH);
 712                 }
 713                 break;
 714         }
 715         case XPT_IMMEDIATE_NOTIFY:
 716         {
 717                 int frozen;
 718
 719                 frozen = (done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0;
 720                 if (softc->state == TARGBH_STATE_TEARDOWN
 721                  || done_ccb->ccb_h.status == CAM_REQ_ABORTED) {
 722                         printf("Freed an immediate notify\n");
 723                         xpt_free_ccb(done_ccb);
 724                 } else {
 725                         /* Requeue for another immediate event */
 726                         xpt_action(done_ccb);
 727                 }
 728                 if (frozen != 0)
 729                         cam_release_devq(periph->path,
 730                                          /*relsim_flags*/0,
 731                                          /*opening reduction*/0,
 732                                          /*timeout*/0,
 733                                          /*getcount_only*/0);
 734                 break;
 735         }
 736         default:
 737                 panic("targbhdone: Unexpected ccb opcode");
 738                 break;
 739         }
 740 }
 741
 742 #ifdef NOTYET
 743 static int
 744 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
 745 {
 746         return 0;
 747 }
 748 #endif
 749
 750 static struct targbh_cmd_desc*
 751 targbhallocdescr()
 752 {
 753         struct targbh_cmd_desc* descr;
 754
 755         /* Allocate the targbh_descr structure */
 756         descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr),
 757                                                M_SCSIBH, M_NOWAIT);
 758         if (descr == NULL)
 759                 return (NULL);
 760
 761         bzero(descr, sizeof(*descr));
 762
 763         /* Allocate buffer backing store */
 764         descr->backing_store = malloc(MAX_BUF_SIZE, M_SCSIBH, M_NOWAIT);
 765         if (descr->backing_store == NULL) {
 766                 free(descr, M_SCSIBH);
 767                 return (NULL);
 768         }
 769         descr->max_size = MAX_BUF_SIZE;
 770         return (descr);
 771 }
 772
 773 static void
 774 targbhfreedescr(struct targbh_cmd_desc *descr)
 775 {
 776         free(descr->backing_store, M_SCSIBH);
 777         free(descr, M_SCSIBH);
 778 }