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 1.4.2.6 2003/11/14 11:31:25 simokawa Exp $
  29  * $DragonFly: src/sys/bus/cam/scsi/scsi_targ_bh.c,v 1.8 2004/03/15 02:27:56 dillon Exp $
  30  */
  31 #include <sys/param.h>
  32 #include <sys/queue.h>
  33 #include <sys/systm.h>
  34 #include <sys/kernel.h>
  35 #include <sys/types.h>
  36 #include <sys/buf.h>
  37 #include <sys/conf.h>
  38 #include <sys/devicestat.h>
  39 #include <sys/malloc.h>
  40 #include <sys/uio.h>
  41
  42 #include "../cam.h"
  43 #include "../cam_ccb.h"
  44 #include "../cam_extend.h"
  45 #include "../cam_periph.h"
  46 #include "../cam_queue.h"
  47 #include "../cam_xpt_periph.h"
  48 #include "../cam_debug.h"
  49
  50 #include "scsi_all.h"
  51 #include "scsi_message.h"
  52
  53 typedef enum {
  54         TARGBH_STATE_NORMAL,
  55         TARGBH_STATE_EXCEPTION,
  56         TARGBH_STATE_TEARDOWN
  57 } targbh_state;
  58
  59 typedef enum {
  60         TARGBH_FLAG_NONE         = 0x00,
  61         TARGBH_FLAG_LUN_ENABLED  = 0x01
  62 } targbh_flags;
  63
  64 typedef enum {
  65         TARGBH_CCB_WORKQ,
  66         TARGBH_CCB_WAITING
  67 } targbh_ccb_types;
  68
  69 #define MAX_ACCEPT      8
  70 #define MAX_IMMEDIATE   16
  71 #define MAX_BUF_SIZE    256     /* Max inquiry/sense/mode page transfer */
  72
  73 /* Offsets into our private CCB area for storing accept information */
  74 #define ccb_type        ppriv_field0
  75 #define ccb_descr       ppriv_ptr1
  76
  77 /* We stick a pointer to the originating accept TIO in each continue I/O CCB */
  78 #define ccb_atio        ppriv_ptr1
  79
  80 TAILQ_HEAD(ccb_queue, ccb_hdr);
  81
  82 struct targbh_softc {
  83         struct          ccb_queue pending_queue;
  84         struct          ccb_queue work_queue;
  85         struct          ccb_queue unknown_atio_queue;
  86         struct          devstat device_stats;
  87         targbh_state    state;
  88         targbh_flags    flags;
  89         u_int           init_level;
  90         u_int           inq_data_len;
  91         struct          ccb_accept_tio *accept_tio_list;
  92         struct          ccb_hdr_slist immed_notify_slist;
  93 };
  94
  95 struct targbh_cmd_desc {
  96         struct    ccb_accept_tio* atio_link;
  97         u_int     data_resid;   /* How much left to transfer */
  98         u_int     data_increment;/* Amount to send before next disconnect */
  99         void*     data;         /* The data. Can be from backing_store or not */
 100         void*     backing_store;/* Backing store allocated for this descriptor*/
 101         u_int     max_size;     /* Size of backing_store */
 102         u_int32_t timeout;
 103         u_int8_t  status;       /* Status to return to initiator */
 104 };
 105
 106 static struct scsi_inquiry_data no_lun_inq_data =
 107 {
 108         T_NODEVICE | (SID_QUAL_BAD_LU << 5), 0,
 109         /* version */2, /* format version */2
 110 };
 111
 112 static struct scsi_sense_data no_lun_sense_data =
 113 {
 114         SSD_CURRENT_ERROR|SSD_ERRCODE_VALID,
 115         0,
 116         SSD_KEY_NOT_READY,
 117         { 0, 0, 0, 0 },
 118         /*extra_len*/offsetof(struct scsi_sense_data, fru)
 119                    - offsetof(struct scsi_sense_data, extra_len),
 120         { 0, 0, 0, 0 },
 121         /* Logical Unit Not Supported */
 122         /*ASC*/0x25, /*ASCQ*/0
 123 };
 124
 125 static const int request_sense_size = offsetof(struct scsi_sense_data, fru);
 126
 127 static periph_init_t    targbhinit;
 128 static void             targbhasync(void *callback_arg, u_int32_t code,
 129                                     struct cam_path *path, void *arg);
 130 static cam_status       targbhenlun(struct cam_periph *periph);
 131 static cam_status       targbhdislun(struct cam_periph *periph);
 132 static periph_ctor_t    targbhctor;
 133 static periph_dtor_t    targbhdtor;
 134 static periph_start_t   targbhstart;
 135 static void             targbhdone(struct cam_periph *periph,
 136                                    union ccb *done_ccb);
 137 #ifdef NOTYET
 138 static  int             targbherror(union ccb *ccb, u_int32_t cam_flags,
 139                                     u_int32_t sense_flags);
 140 #endif
 141 static struct targbh_cmd_desc*  targbhallocdescr(void);
 142 static void             targbhfreedescr(struct targbh_cmd_desc *buf);
 143
 144 static struct periph_driver targbhdriver =
 145 {
 146         targbhinit, "targbh",
 147         TAILQ_HEAD_INITIALIZER(targbhdriver.units), /* generation */ 0
 148 };
 149
 150 DATA_SET(periphdriver_set, targbhdriver);
 151
 152 static void
 153 targbhinit(void)
 154 {
 155         cam_status status;
 156         struct cam_path *path;
 157
 158         /*
 159          * Install a global async callback.  This callback will
 160          * receive async callbacks like "new path registered".
 161          */
 162         status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID,
 163                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
 164
 165         if (status == CAM_REQ_CMP) {
 166                 struct ccb_setasync csa;
 167
 168                 xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5);
 169                 csa.ccb_h.func_code = XPT_SASYNC_CB;
 170                 csa.event_enable = AC_PATH_REGISTERED | AC_PATH_DEREGISTERED;
 171                 csa.callback = targbhasync;
 172                 csa.callback_arg = NULL;
 173                 xpt_action((union ccb *)&csa);
 174                 status = csa.ccb_h.status;
 175                 xpt_free_path(path);
 176         }
 177
 178         if (status != CAM_REQ_CMP) {
 179                 printf("targbh: Failed to attach master async callback "
 180                        "due to status 0x%x!\n", status);
 181         }
 182 }
 183
 184 static void
 185 targbhasync(void *callback_arg, u_int32_t code,
 186             struct cam_path *path, void *arg)
 187 {
 188         struct cam_path *new_path;
 189         struct ccb_pathinq *cpi;
 190         path_id_t bus_path_id;
 191         cam_status status;
 192
 193         cpi = (struct ccb_pathinq *)arg;
 194         if (code == AC_PATH_REGISTERED)
 195                 bus_path_id = cpi->ccb_h.path_id;
 196         else
 197                 bus_path_id = xpt_path_path_id(path);
 198         /*
 199          * Allocate a peripheral instance for
 200          * this target instance.
 201          */
 202         status = xpt_create_path(&new_path, NULL,
 203                                  bus_path_id,
 204                                  CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
 205         if (status != CAM_REQ_CMP) {
 206                 printf("targbhasync: Unable to create path "
 207                         "due to status 0x%x\n", status);
 208                 return;
 209         }
 210
 211         switch (code) {
 212         case AC_PATH_REGISTERED:
 213         {
 214                 /* Only attach to controllers that support target mode */
 215                 if ((cpi->target_sprt & PIT_PROCESSOR) == 0)
 216                         break;
 217
 218                 status = cam_periph_alloc(targbhctor, NULL, targbhdtor,
 219                                           targbhstart,
 220                                           "targbh", CAM_PERIPH_BIO,
 221                                           new_path, targbhasync,
 222                                           AC_PATH_REGISTERED,
 223                                           cpi);
 224                 break;
 225         }
 226         case AC_PATH_DEREGISTERED:
 227         {
 228                 struct cam_periph *periph;
 229
 230                 if ((periph = cam_periph_find(new_path, "targbh")) != NULL)
 231                         cam_periph_invalidate(periph);
 232                 break;
 233         }
 234         default:
 235                 break;
 236         }
 237         xpt_free_path(new_path);
 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 = malloc(sizeof(*atio), M_DEVBUF, M_INTWAIT);
 280
 281                 atio->ccb_h.ccb_descr = targbhallocdescr();
 282
 283                 xpt_setup_ccb(&atio->ccb_h, periph->path, /*priority*/1);
 284                 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO;
 285                 atio->ccb_h.cbfcnp = targbhdone;
 286                 xpt_action((union ccb *)atio);
 287                 status = atio->ccb_h.status;
 288                 if (status != CAM_REQ_INPROG) {
 289                         targbhfreedescr(atio->ccb_h.ccb_descr);
 290                         free(atio, M_DEVBUF);
 291                         break;
 292                 }
 293                 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link =
 294                     softc->accept_tio_list;
 295                 softc->accept_tio_list = atio;
 296         }
 297
 298         if (i == 0) {
 299                 xpt_print_path(periph->path);
 300                 printf("targbhenlun - Could not allocate accept tio CCBs: "
 301                        "status = 0x%x\n", status);
 302                 targbhdislun(periph);
 303                 return (CAM_REQ_CMP_ERR);
 304         }
 305
 306         /*
 307          * Build up a buffer of immediate notify CCBs
 308          * so the SIM can tell us of asynchronous target mode events.
 309          */
 310         for (i = 0; i < MAX_ACCEPT; i++) {
 311                 struct ccb_immed_notify *inot;
 312
 313                 inot = malloc(sizeof(*inot), M_DEVBUF, M_INTWAIT);
 314
 315                 xpt_setup_ccb(&inot->ccb_h, periph->path, /*priority*/1);
 316                 inot->ccb_h.func_code = XPT_IMMED_NOTIFY;
 317                 inot->ccb_h.cbfcnp = targbhdone;
 318                 xpt_action((union ccb *)inot);
 319                 status = inot->ccb_h.status;
 320                 if (status != CAM_REQ_INPROG) {
 321                         free(inot, M_DEVBUF);
 322                         break;
 323                 }
 324                 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h,
 325                                   periph_links.sle);
 326         }
 327
 328         if (i == 0) {
 329                 xpt_print_path(periph->path);
 330                 printf("targbhenlun - Could not allocate immediate notify "
 331                        "CCBs: status = 0x%x\n", status);
 332                 targbhdislun(periph);
 333                 return (CAM_REQ_CMP_ERR);
 334         }
 335
 336         return (CAM_REQ_CMP);
 337 }
 338
 339 static cam_status
 340 targbhdislun(struct cam_periph *periph)
 341 {
 342         union ccb ccb;
 343         struct targbh_softc *softc;
 344         struct ccb_accept_tio* atio;
 345         struct ccb_hdr *ccb_h;
 346
 347         softc = (struct targbh_softc *)periph->softc;
 348         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0)
 349                 return CAM_REQ_CMP;
 350
 351         /* XXX Block for Continue I/O completion */
 352
 353         /* Kill off all ACCECPT and IMMEDIATE CCBs */
 354         while ((atio = softc->accept_tio_list) != NULL) {
 355
 356                 softc->accept_tio_list =
 357                     ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link;
 358                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1);
 359                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 360                 ccb.cab.abort_ccb = (union ccb *)atio;
 361                 xpt_action(&ccb);
 362         }
 363
 364         while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) {
 365                 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle);
 366                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1);
 367                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 368                 ccb.cab.abort_ccb = (union ccb *)ccb_h;
 369                 xpt_action(&ccb);
 370         }
 371
 372         /*
 373          * Dissable this lun.
 374          */
 375         xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, /*priority*/1);
 376         ccb.cel.ccb_h.func_code = XPT_EN_LUN;
 377         ccb.cel.enable = 0;
 378         xpt_action(&ccb);
 379
 380         if (ccb.cel.ccb_h.status != CAM_REQ_CMP)
 381                 printf("targbhdislun - Disabling lun on controller failed "
 382                        "with status 0x%x\n", ccb.cel.ccb_h.status);
 383         else
 384                 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED;
 385         return (ccb.cel.ccb_h.status);
 386 }
 387
 388 static cam_status
 389 targbhctor(struct cam_periph *periph, void *arg)
 390 {
 391         struct ccb_pathinq *cpi;
 392         struct targbh_softc *softc;
 393
 394         cpi = (struct ccb_pathinq *)arg;
 395
 396         /* Allocate our per-instance private storage */
 397         softc = malloc(sizeof(*softc), M_DEVBUF, M_INTWAIT | M_ZERO);
 398         TAILQ_INIT(&softc->pending_queue);
 399         TAILQ_INIT(&softc->work_queue);
 400         softc->accept_tio_list = NULL;
 401         SLIST_INIT(&softc->immed_notify_slist);
 402         softc->state = TARGBH_STATE_NORMAL;
 403         periph->softc = softc;
 404         softc->init_level++;
 405
 406         return (targbhenlun(periph));
 407 }
 408
 409 static void
 410 targbhdtor(struct cam_periph *periph)
 411 {
 412         struct targbh_softc *softc;
 413
 414         softc = (struct targbh_softc *)periph->softc;
 415
 416         softc->state = TARGBH_STATE_TEARDOWN;
 417
 418         targbhdislun(periph);
 419
 420         switch (softc->init_level) {
 421         case 0:
 422                 panic("targdtor - impossible init level");;
 423         case 1:
 424                 /* FALLTHROUGH */
 425         default:
 426                 /* XXX Wait for callback of targbhdislun() */
 427                 tsleep(softc, 0, "targbh", hz/2);
 428                 free(softc, M_DEVBUF);
 429                 break;
 430         }
 431 }
 432
 433 static void
 434 targbhstart(struct cam_periph *periph, union ccb *start_ccb)
 435 {
 436         struct targbh_softc *softc;
 437         struct ccb_hdr *ccbh;
 438         struct ccb_accept_tio *atio;
 439         struct targbh_cmd_desc *desc;
 440         struct ccb_scsiio *csio;
 441         ccb_flags flags;
 442         int    s;
 443
 444         softc = (struct targbh_softc *)periph->softc;
 445
 446         s = splbio();
 447         ccbh = TAILQ_FIRST(&softc->work_queue);
 448         if (periph->immediate_priority <= periph->pinfo.priority) {
 449                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WAITING;
 450                 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
 451                                   periph_links.sle);
 452                 periph->immediate_priority = CAM_PRIORITY_NONE;
 453                 splx(s);
 454                 wakeup(&periph->ccb_list);
 455         } else if (ccbh == NULL) {
 456                 splx(s);
 457                 xpt_release_ccb(start_ccb);
 458         } else {
 459                 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe);
 460                 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh,
 461                                   periph_links.tqe);
 462                 splx(s);
 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 & (CAM_TAG_ACTION_VALID|CAM_DIR_MASK);
 468
 469                 csio = &start_ccb->csio;
 470                 /*
 471                  * If we are done with the transaction, tell the
 472                  * controller to send status and perform a CMD_CMPLT.
 473                  * If we have associated sense data, see if we can
 474                  * send that too.
 475                  */
 476                 if (desc->data_resid == desc->data_increment) {
 477                         flags |= CAM_SEND_STATUS;
 478                         if (atio->sense_len) {
 479                                 csio->sense_len = atio->sense_len;
 480                                 csio->sense_data = atio->sense_data;
 481                                 flags |= CAM_SEND_SENSE;
 482                         }
 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                 s = splbio();
 510                 ccbh = TAILQ_FIRST(&softc->work_queue);
 511                 splx(s);
 512         }
 513         if (ccbh != NULL)
 514                 xpt_schedule(periph, /*priority*/1);
 515 }
 516
 517 static void
 518 targbhdone(struct cam_periph *periph, union ccb *done_ccb)
 519 {
 520         struct targbh_softc *softc;
 521
 522         softc = (struct targbh_softc *)periph->softc;
 523
 524         if (done_ccb->ccb_h.ccb_type == TARGBH_CCB_WAITING) {
 525                 /* Caller will release the CCB */
 526                 wakeup(&done_ccb->ccb_h.cbfcnp);
 527                 return;
 528         }
 529
 530         switch (done_ccb->ccb_h.func_code) {
 531         case XPT_ACCEPT_TARGET_IO:
 532         {
 533                 struct ccb_accept_tio *atio;
 534                 struct targbh_cmd_desc *descr;
 535                 u_int8_t *cdb;
 536
 537                 atio = &done_ccb->atio;
 538                 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr;
 539                 cdb = atio->cdb_io.cdb_bytes;
 540                 if (softc->state == TARGBH_STATE_TEARDOWN
 541                  || atio->ccb_h.status == CAM_REQ_ABORTED) {
 542                         targbhfreedescr(descr);
 543                         free(done_ccb, M_DEVBUF);
 544                         return;
 545                 }
 546
 547                 /*
 548                  * Determine the type of incoming command and
 549                  * setup our buffer for a response.
 550                  */
 551                 switch (cdb[0]) {
 552                 case INQUIRY:
 553                 {
 554                         struct scsi_inquiry *inq;
 555
 556                         inq = (struct scsi_inquiry *)cdb;
 557                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 558                                   ("Saw an inquiry!\n"));
 559                         /*
 560                          * Validate the command.  We don't
 561                          * support any VPD pages, so complain
 562                          * if EVPD is set.
 563                          */
 564                         if ((inq->byte2 & SI_EVPD) != 0
 565                          || inq->page_code != 0) {
 566                                 atio->ccb_h.flags &= ~CAM_DIR_MASK;
 567                                 atio->ccb_h.flags |= CAM_DIR_NONE;
 568                                 /*
 569                                  * This needs to have other than a
 570                                  * no_lun_sense_data response.
 571                                  */
 572                                 atio->sense_data = no_lun_sense_data;
 573                                 atio->sense_len = sizeof(no_lun_sense_data);
 574                                 descr->data_resid = 0;
 575                                 descr->data_increment = 0;
 576                                 descr->status = SCSI_STATUS_CHECK_COND;
 577                                 break;
 578                         }
 579                         /*
 580                          * Direction is always relative
 581                          * to the initator.
 582                          */
 583                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 584                         atio->ccb_h.flags |= CAM_DIR_IN;
 585                         descr->data = &no_lun_inq_data;
 586                         descr->data_resid = MIN(sizeof(no_lun_inq_data),
 587                                                 SCSI_CDB6_LEN(inq->length));
 588                         descr->data_increment = descr->data_resid;
 589                         descr->timeout = 5 * 1000;
 590                         descr->status = SCSI_STATUS_OK;
 591                         break;
 592                 }
 593                 case REQUEST_SENSE:
 594                 {
 595                         struct scsi_request_sense *rsense;
 596
 597                         rsense = (struct scsi_request_sense *)cdb;
 598                         /* Refer to static sense data */
 599                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 600                         atio->ccb_h.flags |= CAM_DIR_IN;
 601                         descr->data = &no_lun_sense_data;
 602                         descr->data_resid = request_sense_size;
 603                         descr->data_resid = MIN(descr->data_resid,
 604                                                 SCSI_CDB6_LEN(rsense->length));
 605                         descr->data_increment = descr->data_resid;
 606                         descr->timeout = 5 * 1000;
 607                         descr->status = SCSI_STATUS_OK;
 608                         break;
 609                 }
 610                 default:
 611                         /* Constant CA, tell initiator */
 612                         /* Direction is always relative to the initator */
 613                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 614                         atio->ccb_h.flags |= CAM_DIR_NONE;
 615                         atio->sense_data = no_lun_sense_data;
 616                         atio->sense_len = sizeof (no_lun_sense_data);
 617                         descr->data_resid = 0;
 618                         descr->data_increment = 0;
 619                         descr->timeout = 5 * 1000;
 620                         descr->status = SCSI_STATUS_CHECK_COND;
 621                         break;
 622                 }
 623
 624                 /* Queue us up to receive a Continue Target I/O ccb. */
 625                 TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h,
 626                                   periph_links.tqe);
 627                 xpt_schedule(periph, /*priority*/1);
 628                 break;
 629         }
 630         case XPT_CONT_TARGET_IO:
 631         {
 632                 struct ccb_accept_tio *atio;
 633                 struct targbh_cmd_desc *desc;
 634
 635                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 636                           ("Received completed CTIO\n"));
 637                 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio;
 638                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 639
 640                 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h,
 641                              periph_links.tqe);
 642
 643                 /*
 644                  * We could check for CAM_SENT_SENSE bein set here,
 645                  * but since we're not maintaining any CA/UA state,
 646                  * there's no point.
 647                  */
 648                 atio->sense_len = 0;
 649                 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE;
 650                 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE;
 651
 652                 /* XXX Check for errors */
 653                 desc->data_resid -= desc->data_increment;
 654                 xpt_release_ccb(done_ccb);
 655                 if (softc->state != TARGBH_STATE_TEARDOWN) {
 656
 657                         /*
 658                          * Send the original accept TIO back to the
 659                          * controller to handle more work.
 660                          */
 661                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 662                                   ("Returning ATIO to target\n"));
 663                         /* Restore wildcards */
 664                         atio->ccb_h.target_id = CAM_TARGET_WILDCARD;
 665                         atio->ccb_h.target_lun = CAM_LUN_WILDCARD;
 666                         xpt_action((union ccb *)atio);
 667                         break;
 668                 } else {
 669                         targbhfreedescr(desc);
 670                         free(atio, M_DEVBUF);
 671                 }
 672                 break;
 673         }
 674         case XPT_IMMED_NOTIFY:
 675         {
 676                 if (softc->state == TARGBH_STATE_TEARDOWN
 677                  || done_ccb->ccb_h.status == CAM_REQ_ABORTED) {
 678                         printf("Freed an immediate notify\n");
 679                         free(done_ccb, M_DEVBUF);
 680                 }
 681                 break;
 682         }
 683         default:
 684                 panic("targbhdone: Unexpected ccb opcode");
 685                 break;
 686         }
 687 }
 688
 689 #ifdef NOTYET
 690 static int
 691 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
 692 {
 693         return 0;
 694 }
 695 #endif
 696
 697 static struct targbh_cmd_desc*
 698 targbhallocdescr()
 699 {
 700         struct targbh_cmd_desc* descr;
 701
 702         /* Allocate the targbh_descr structure */
 703         descr = malloc(sizeof(*descr), M_DEVBUF, M_INTWAIT | M_ZERO);
 704
 705         /* Allocate buffer backing store */
 706         descr->backing_store = malloc(MAX_BUF_SIZE, M_DEVBUF, M_INTWAIT);
 707         descr->max_size = MAX_BUF_SIZE;
 708         return (descr);
 709 }
 710
 711 static void
 712 targbhfreedescr(struct targbh_cmd_desc *descr)
 713 {
 714         free(descr->backing_store, M_DEVBUF);
 715         free(descr, M_DEVBUF);
 716 }