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  * $DragonFly: src/sys/bus/cam/scsi/scsi_targ_bh.c,v 1.4 2003/08/07 21:16:45 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;
 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_periph *periph;
 189
 190         periph = (struct cam_periph *)callback_arg;
 191         switch (code) {
 192         case AC_PATH_REGISTERED:
 193         {
 194                 struct ccb_pathinq *cpi;
 195                 struct cam_path *new_path;
 196                 cam_status status;
 197
 198                 cpi = (struct ccb_pathinq *)arg;
 199
 200                 /* Only attach to controllers that support target mode */
 201                 if ((cpi->target_sprt & PIT_PROCESSOR) == 0)
 202                         break;
 203
 204                 /*
 205                  * Allocate a peripheral instance for
 206                  * this target instance.
 207                  */
 208                 status = xpt_create_path(&new_path, NULL,
 209                                          xpt_path_path_id(path),
 210                                          CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD);
 211                 if (status != CAM_REQ_CMP) {
 212                         printf("targbhasync: Unable to create path "
 213                                 "due to status 0x%x\n", status);
 214                         break;
 215                 }
 216                 status = cam_periph_alloc(targbhctor, NULL, targbhdtor,
 217                                           targbhstart,
 218                                           "targbh", CAM_PERIPH_BIO,
 219                                           new_path, targbhasync,
 220                                           AC_PATH_REGISTERED,
 221                                           cpi);
 222                 xpt_free_path(new_path);
 223                 if (status != CAM_REQ_CMP
 224                  && status != CAM_REQ_INPROG)
 225                         printf("targbhasync: Unable to allocate new periph "
 226                                "due to status 0x%x\n", status);
 227                 break;
 228         }
 229         case AC_PATH_DEREGISTERED:
 230         {
 231                 targbhdislun(periph);
 232                 break;
 233         }
 234         default:
 235                 break;
 236         }
 237 }
 238
 239 /* Attempt to enable our lun */
 240 static cam_status
 241 targbhenlun(struct cam_periph *periph)
 242 {
 243         union ccb immed_ccb;
 244         struct targbh_softc *softc;
 245         cam_status status;
 246         int i;
 247
 248         softc = (struct targbh_softc *)periph->softc;
 249
 250         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0)
 251                 return (CAM_REQ_CMP);
 252
 253         xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, /*priority*/1);
 254         immed_ccb.ccb_h.func_code = XPT_EN_LUN;
 255
 256         /* Don't need support for any vendor specific commands */
 257         immed_ccb.cel.grp6_len = 0;
 258         immed_ccb.cel.grp7_len = 0;
 259         immed_ccb.cel.enable = 1;
 260         xpt_action(&immed_ccb);
 261         status = immed_ccb.ccb_h.status;
 262         if (status != CAM_REQ_CMP) {
 263                 xpt_print_path(periph->path);
 264                 printf("targbhenlun - Enable Lun Rejected with status 0x%x\n",
 265                        status);
 266                 return (status);
 267         }
 268
 269         softc->flags |= TARGBH_FLAG_LUN_ENABLED;
 270
 271         /*
 272          * Build up a buffer of accept target I/O
 273          * operations for incoming selections.
 274          */
 275         for (i = 0; i < MAX_ACCEPT; i++) {
 276                 struct ccb_accept_tio *atio;
 277
 278                 atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_DEVBUF,
 279                                                       M_NOWAIT);
 280                 if (atio == NULL) {
 281                         status = CAM_RESRC_UNAVAIL;
 282                         break;
 283                 }
 284
 285                 atio->ccb_h.ccb_descr = targbhallocdescr();
 286
 287                 if (atio->ccb_h.ccb_descr == NULL) {
 288                         free(atio, M_DEVBUF);
 289                         status = CAM_RESRC_UNAVAIL;
 290                         break;
 291                 }
 292
 293                 xpt_setup_ccb(&atio->ccb_h, periph->path, /*priority*/1);
 294                 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO;
 295                 atio->ccb_h.cbfcnp = targbhdone;
 296                 xpt_action((union ccb *)atio);
 297                 status = atio->ccb_h.status;
 298                 if (status != CAM_REQ_INPROG) {
 299                         targbhfreedescr(atio->ccb_h.ccb_descr);
 300                         free(atio, M_DEVBUF);
 301                         break;
 302                 }
 303                 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link =
 304                     softc->accept_tio_list;
 305                 softc->accept_tio_list = atio;
 306         }
 307
 308         if (i == 0) {
 309                 xpt_print_path(periph->path);
 310                 printf("targbhenlun - Could not allocate accept tio CCBs: "
 311                        "status = 0x%x\n", status);
 312                 targbhdislun(periph);
 313                 return (CAM_REQ_CMP_ERR);
 314         }
 315
 316         /*
 317          * Build up a buffer of immediate notify CCBs
 318          * so the SIM can tell us of asynchronous target mode events.
 319          */
 320         for (i = 0; i < MAX_ACCEPT; i++) {
 321                 struct ccb_immed_notify *inot;
 322
 323                 inot = (struct ccb_immed_notify*)malloc(sizeof(*inot), M_DEVBUF,
 324                                                         M_NOWAIT);
 325
 326                 if (inot == NULL) {
 327                         status = CAM_RESRC_UNAVAIL;
 328                         break;
 329                 }
 330
 331                 xpt_setup_ccb(&inot->ccb_h, periph->path, /*priority*/1);
 332                 inot->ccb_h.func_code = XPT_IMMED_NOTIFY;
 333                 inot->ccb_h.cbfcnp = targbhdone;
 334                 xpt_action((union ccb *)inot);
 335                 status = inot->ccb_h.status;
 336                 if (status != CAM_REQ_INPROG) {
 337                         free(inot, M_DEVBUF);
 338                         break;
 339                 }
 340                 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h,
 341                                   periph_links.sle);
 342         }
 343
 344         if (i == 0) {
 345                 xpt_print_path(periph->path);
 346                 printf("targbhenlun - Could not allocate immediate notify "
 347                        "CCBs: status = 0x%x\n", status);
 348                 targbhdislun(periph);
 349                 return (CAM_REQ_CMP_ERR);
 350         }
 351
 352         return (CAM_REQ_CMP);
 353 }
 354
 355 static cam_status
 356 targbhdislun(struct cam_periph *periph)
 357 {
 358         union ccb ccb;
 359         struct targbh_softc *softc;
 360         struct ccb_accept_tio* atio;
 361         struct ccb_hdr *ccb_h;
 362
 363         softc = (struct targbh_softc *)periph->softc;
 364         if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0)
 365                 return CAM_REQ_CMP;
 366
 367         /* XXX Block for Continue I/O completion */
 368
 369         /* Kill off all ACCECPT and IMMEDIATE CCBs */
 370         while ((atio = softc->accept_tio_list) != NULL) {
 371
 372                 softc->accept_tio_list =
 373                     ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link;
 374                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1);
 375                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 376                 ccb.cab.abort_ccb = (union ccb *)atio;
 377                 xpt_action(&ccb);
 378         }
 379
 380         while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) {
 381                 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle);
 382                 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1);
 383                 ccb.cab.ccb_h.func_code = XPT_ABORT;
 384                 ccb.cab.abort_ccb = (union ccb *)ccb_h;
 385                 xpt_action(&ccb);
 386         }
 387
 388         /*
 389          * Dissable this lun.
 390          */
 391         xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, /*priority*/1);
 392         ccb.cel.ccb_h.func_code = XPT_EN_LUN;
 393         ccb.cel.enable = 0;
 394         xpt_action(&ccb);
 395
 396         if (ccb.cel.ccb_h.status != CAM_REQ_CMP)
 397                 printf("targbhdislun - Disabling lun on controller failed "
 398                        "with status 0x%x\n", ccb.cel.ccb_h.status);
 399         else
 400                 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED;
 401         return (ccb.cel.ccb_h.status);
 402 }
 403
 404 static cam_status
 405 targbhctor(struct cam_periph *periph, void *arg)
 406 {
 407         struct ccb_pathinq *cpi;
 408         struct targbh_softc *softc;
 409
 410         cpi = (struct ccb_pathinq *)arg;
 411
 412         /* Allocate our per-instance private storage */
 413         softc = (struct targbh_softc *)malloc(sizeof(*softc),
 414                                               M_DEVBUF, M_NOWAIT);
 415         if (softc == NULL) {
 416                 printf("targctor: unable to malloc softc\n");
 417                 return (CAM_REQ_CMP_ERR);
 418         }
 419
 420         bzero(softc, sizeof(*softc));
 421         TAILQ_INIT(&softc->pending_queue);
 422         TAILQ_INIT(&softc->work_queue);
 423         softc->accept_tio_list = NULL;
 424         SLIST_INIT(&softc->immed_notify_slist);
 425         softc->state = TARGBH_STATE_NORMAL;
 426         periph->softc = softc;
 427         softc->init_level++;
 428
 429         return (targbhenlun(periph));
 430 }
 431
 432 static void
 433 targbhdtor(struct cam_periph *periph)
 434 {
 435         struct targbh_softc *softc;
 436
 437         softc = (struct targbh_softc *)periph->softc;
 438
 439         softc->state = TARGBH_STATE_TEARDOWN;
 440
 441         targbhdislun(periph);
 442
 443         switch (softc->init_level) {
 444         default:
 445                 /* FALLTHROUGH */
 446         case 1:
 447                 free(softc, M_DEVBUF);
 448                 break;
 449         case 0:
 450                 panic("targdtor - impossible init level");;
 451         }
 452 }
 453
 454 static void
 455 targbhstart(struct cam_periph *periph, union ccb *start_ccb)
 456 {
 457         struct targbh_softc *softc;
 458         struct ccb_hdr *ccbh;
 459         struct ccb_accept_tio *atio;
 460         struct targbh_cmd_desc *desc;
 461         struct ccb_scsiio *csio;
 462         ccb_flags flags;
 463         int    s;
 464
 465         softc = (struct targbh_softc *)periph->softc;
 466
 467         s = splbio();
 468         ccbh = TAILQ_FIRST(&softc->work_queue);
 469         if (periph->immediate_priority <= periph->pinfo.priority) {
 470                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WAITING;
 471                 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h,
 472                                   periph_links.sle);
 473                 periph->immediate_priority = CAM_PRIORITY_NONE;
 474                 splx(s);
 475                 wakeup(&periph->ccb_list);
 476         } else if (ccbh == NULL) {
 477                 splx(s);
 478                 xpt_release_ccb(start_ccb);
 479         } else {
 480                 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe);
 481                 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh,
 482                                   periph_links.tqe);
 483                 splx(s);
 484                 atio = (struct ccb_accept_tio*)ccbh;
 485                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 486
 487                 /* Is this a tagged request? */
 488                 flags = atio->ccb_h.flags & (CAM_TAG_ACTION_VALID|CAM_DIR_MASK);
 489
 490                 csio = &start_ccb->csio;
 491                 /*
 492                  * If we are done with the transaction, tell the
 493                  * controller to send status and perform a CMD_CMPLT.
 494                  * If we have associated sense data, see if we can
 495                  * send that too.
 496                  */
 497                 if (desc->data_resid == desc->data_increment) {
 498                         flags |= CAM_SEND_STATUS;
 499                         if (atio->sense_len) {
 500                                 csio->sense_len = atio->sense_len;
 501                                 csio->sense_data = atio->sense_data;
 502                                 flags |= CAM_SEND_SENSE;
 503                         }
 504
 505                 }
 506
 507                 cam_fill_ctio(csio,
 508                               /*retries*/2,
 509                               targbhdone,
 510                               flags,
 511                               (flags & CAM_TAG_ACTION_VALID)?
 512                                 MSG_SIMPLE_Q_TAG : 0,
 513                               atio->tag_id,
 514                               atio->init_id,
 515                               desc->status,
 516                               /*data_ptr*/desc->data_increment == 0
 517                                           ? NULL : desc->data,
 518                               /*dxfer_len*/desc->data_increment,
 519                               /*timeout*/desc->timeout);
 520
 521                 /* Override our wildcard attachment */
 522                 start_ccb->ccb_h.target_id = atio->ccb_h.target_id;
 523                 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun;
 524
 525                 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ;
 526                 start_ccb->ccb_h.ccb_atio = atio;
 527                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 528                           ("Sending a CTIO\n"));
 529                 xpt_action(start_ccb);
 530                 s = splbio();
 531                 ccbh = TAILQ_FIRST(&softc->work_queue);
 532                 splx(s);
 533         }
 534         if (ccbh != NULL)
 535                 xpt_schedule(periph, /*priority*/1);
 536 }
 537
 538 static void
 539 targbhdone(struct cam_periph *periph, union ccb *done_ccb)
 540 {
 541         struct targbh_softc *softc;
 542
 543         softc = (struct targbh_softc *)periph->softc;
 544
 545         if (done_ccb->ccb_h.ccb_type == TARGBH_CCB_WAITING) {
 546                 /* Caller will release the CCB */
 547                 wakeup(&done_ccb->ccb_h.cbfcnp);
 548                 return;
 549         }
 550
 551         switch (done_ccb->ccb_h.func_code) {
 552         case XPT_ACCEPT_TARGET_IO:
 553         {
 554                 struct ccb_accept_tio *atio;
 555                 struct targbh_cmd_desc *descr;
 556                 u_int8_t *cdb;
 557
 558                 atio = &done_ccb->atio;
 559                 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr;
 560                 cdb = atio->cdb_io.cdb_bytes;
 561                 if (softc->state == TARGBH_STATE_TEARDOWN
 562                  || atio->ccb_h.status == CAM_REQ_ABORTED) {
 563                         targbhfreedescr(descr);
 564                         free(done_ccb, M_DEVBUF);
 565                         return;
 566                 }
 567
 568                 /*
 569                  * Determine the type of incoming command and
 570                  * setup our buffer for a response.
 571                  */
 572                 switch (cdb[0]) {
 573                 case INQUIRY:
 574                 {
 575                         struct scsi_inquiry *inq;
 576
 577                         inq = (struct scsi_inquiry *)cdb;
 578                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 579                                   ("Saw an inquiry!\n"));
 580                         /*
 581                          * Validate the command.  We don't
 582                          * support any VPD pages, so complain
 583                          * if EVPD is set.
 584                          */
 585                         if ((inq->byte2 & SI_EVPD) != 0
 586                          || inq->page_code != 0) {
 587                                 atio->ccb_h.flags &= ~CAM_DIR_MASK;
 588                                 atio->ccb_h.flags |= CAM_DIR_NONE;
 589                                 /*
 590                                  * This needs to have other than a
 591                                  * no_lun_sense_data response.
 592                                  */
 593                                 atio->sense_data = no_lun_sense_data;
 594                                 atio->sense_len = sizeof(no_lun_sense_data);
 595                                 descr->data_resid = 0;
 596                                 descr->data_increment = 0;
 597                                 descr->status = SCSI_STATUS_CHECK_COND;
 598                                 break;
 599                         }
 600                         /*
 601                          * Direction is always relative
 602                          * to the initator.
 603                          */
 604                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 605                         atio->ccb_h.flags |= CAM_DIR_IN;
 606                         descr->data = &no_lun_inq_data;
 607                         descr->data_resid = MIN(sizeof(no_lun_inq_data),
 608                                                 SCSI_CDB6_LEN(inq->length));
 609                         descr->data_increment = descr->data_resid;
 610                         descr->timeout = 5 * 1000;
 611                         descr->status = SCSI_STATUS_OK;
 612                         break;
 613                 }
 614                 case REQUEST_SENSE:
 615                 {
 616                         struct scsi_request_sense *rsense;
 617
 618                         rsense = (struct scsi_request_sense *)cdb;
 619                         /* Refer to static sense data */
 620                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 621                         atio->ccb_h.flags |= CAM_DIR_IN;
 622                         descr->data = &no_lun_sense_data;
 623                         descr->data_resid = request_sense_size;
 624                         descr->data_resid = MIN(descr->data_resid,
 625                                                 SCSI_CDB6_LEN(rsense->length));
 626                         descr->data_increment = descr->data_resid;
 627                         descr->timeout = 5 * 1000;
 628                         descr->status = SCSI_STATUS_OK;
 629                         break;
 630                 }
 631                 default:
 632                         /* Constant CA, tell initiator */
 633                         /* Direction is always relative to the initator */
 634                         atio->ccb_h.flags &= ~CAM_DIR_MASK;
 635                         atio->ccb_h.flags |= CAM_DIR_NONE;
 636                         atio->sense_data = no_lun_sense_data;
 637                         atio->sense_len = sizeof (no_lun_sense_data);
 638                         descr->data_resid = 0;
 639                         descr->data_increment = 0;
 640                         descr->timeout = 5 * 1000;
 641                         descr->status = SCSI_STATUS_CHECK_COND;
 642                         break;
 643                 }
 644
 645                 /* Queue us up to receive a Continue Target I/O ccb. */
 646                 TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h,
 647                                   periph_links.tqe);
 648                 xpt_schedule(periph, /*priority*/1);
 649                 break;
 650         }
 651         case XPT_CONT_TARGET_IO:
 652         {
 653                 struct ccb_accept_tio *atio;
 654                 struct targbh_cmd_desc *desc;
 655
 656                 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 657                           ("Received completed CTIO\n"));
 658                 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio;
 659                 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr;
 660
 661                 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h,
 662                              periph_links.tqe);
 663
 664                 /*
 665                  * We could check for CAM_SENT_SENSE bein set here,
 666                  * but since we're not maintaining any CA/UA state,
 667                  * there's no point.
 668                  */
 669                 atio->sense_len = 0;
 670                 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE;
 671                 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE;
 672
 673                 /* XXX Check for errors */
 674                 desc->data_resid -= desc->data_increment;
 675                 xpt_release_ccb(done_ccb);
 676                 if (softc->state != TARGBH_STATE_TEARDOWN) {
 677
 678                         /*
 679                          * Send the original accept TIO back to the
 680                          * controller to handle more work.
 681                          */
 682                         CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE,
 683                                   ("Returning ATIO to target\n"));
 684                         /* Restore wildcards */
 685                         atio->ccb_h.target_id = CAM_TARGET_WILDCARD;
 686                         atio->ccb_h.target_lun = CAM_LUN_WILDCARD;
 687                         xpt_action((union ccb *)atio);
 688                         break;
 689                 } else {
 690                         targbhfreedescr(desc);
 691                         free(atio, M_DEVBUF);
 692                 }
 693                 break;
 694         }
 695         case XPT_IMMED_NOTIFY:
 696         {
 697                 if (softc->state == TARGBH_STATE_TEARDOWN
 698                  || done_ccb->ccb_h.status == CAM_REQ_ABORTED) {
 699                         printf("Freed an immediate notify\n");
 700                         free(done_ccb, M_DEVBUF);
 701                 }
 702                 break;
 703         }
 704         default:
 705                 panic("targbhdone: Unexpected ccb opcode");
 706                 break;
 707         }
 708 }
 709
 710 #ifdef NOTYET
 711 static int
 712 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags)
 713 {
 714         return 0;
 715 }
 716 #endif
 717
 718 static struct targbh_cmd_desc*
 719 targbhallocdescr()
 720 {
 721         struct targbh_cmd_desc* descr;
 722
 723         /* Allocate the targbh_descr structure */
 724         descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr),
 725                                                M_DEVBUF, M_NOWAIT);
 726         if (descr == NULL)
 727                 return (NULL);
 728
 729         bzero(descr, sizeof(*descr));
 730
 731         /* Allocate buffer backing store */
 732         descr->backing_store = malloc(MAX_BUF_SIZE, M_DEVBUF, M_NOWAIT);
 733         if (descr->backing_store == NULL) {
 734                 free(descr, M_DEVBUF);
 735                 return (NULL);
 736         }
 737         descr->max_size = MAX_BUF_SIZE;
 738         return (descr);
 739 }
 740
 741 static void
 742 targbhfreedescr(struct targbh_cmd_desc *descr)
 743 {
 744         free(descr->backing_store, M_DEVBUF);
 745         free(descr, M_DEVBUF);
 746 }