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 1.2 2003/06/17 04:28:19 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/cam.h> 43 #include <cam/cam_ccb.h> 44 #include <cam/cam_extend.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 50 #include <cam/scsi/scsi_all.h> 51 #include <cam/scsi/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 #define MIN(a, b) ((a > b) ? b : a) 74 75 /* Offsets into our private CCB area for storing accept information */ 76 #define ccb_type ppriv_field0 77 #define ccb_descr ppriv_ptr1 78 79 /* We stick a pointer to the originating accept TIO in each continue I/O CCB */ 80 #define ccb_atio ppriv_ptr1 81 82 TAILQ_HEAD(ccb_queue, ccb_hdr); 83 84 struct targbh_softc { 85 struct ccb_queue pending_queue; 86 struct ccb_queue work_queue; 87 struct ccb_queue unknown_atio_queue; 88 struct devstat device_stats; 89 targbh_state state; 90 targbh_flags flags; 91 u_int init_level; 92 u_int inq_data_len; 93 struct ccb_accept_tio *accept_tio_list; 94 struct ccb_hdr_slist immed_notify_slist; 95 }; 96 97 struct targbh_cmd_desc { 98 struct ccb_accept_tio* atio_link; 99 u_int data_resid; /* How much left to transfer */ 100 u_int data_increment;/* Amount to send before next disconnect */ 101 void* data; /* The data. Can be from backing_store or not */ 102 void* backing_store;/* Backing store allocated for this descriptor*/ 103 u_int max_size; /* Size of backing_store */ 104 u_int32_t timeout; 105 u_int8_t status; /* Status to return to initiator */ 106 }; 107 108 static struct scsi_inquiry_data no_lun_inq_data = 109 { 110 T_NODEVICE | (SID_QUAL_BAD_LU << 5), 0, 111 /* version */2, /* format version */2 112 }; 113 114 static struct scsi_sense_data no_lun_sense_data = 115 { 116 SSD_CURRENT_ERROR|SSD_ERRCODE_VALID, 117 0, 118 SSD_KEY_NOT_READY, 119 { 0, 0, 0, 0 }, 120 /*extra_len*/offsetof(struct scsi_sense_data, fru) 121 - offsetof(struct scsi_sense_data, extra_len), 122 { 0, 0, 0, 0 }, 123 /* Logical Unit Not Supported */ 124 /*ASC*/0x25, /*ASCQ*/0 125 }; 126 127 static const int request_sense_size = offsetof(struct scsi_sense_data, fru); 128 129 static periph_init_t targbhinit; 130 static void targbhasync(void *callback_arg, u_int32_t code, 131 struct cam_path *path, void *arg); 132 static cam_status targbhenlun(struct cam_periph *periph); 133 static cam_status targbhdislun(struct cam_periph *periph); 134 static periph_ctor_t targbhctor; 135 static periph_dtor_t targbhdtor; 136 static periph_start_t targbhstart; 137 static void targbhdone(struct cam_periph *periph, 138 union ccb *done_ccb); 139 #ifdef NOTYET 140 static int targbherror(union ccb *ccb, u_int32_t cam_flags, 141 u_int32_t sense_flags); 142 #endif 143 static struct targbh_cmd_desc* targbhallocdescr(void); 144 static void targbhfreedescr(struct targbh_cmd_desc *buf); 145 146 static struct periph_driver targbhdriver = 147 { 148 targbhinit, "targbh", 149 TAILQ_HEAD_INITIALIZER(targbhdriver.units), /* generation */ 0 150 }; 151 152 DATA_SET(periphdriver_set, targbhdriver); 153 154 static void 155 targbhinit(void) 156 { 157 cam_status status; 158 struct cam_path *path; 159 160 /* 161 * Install a global async callback. This callback will 162 * receive async callbacks like "new path registered". 163 */ 164 status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID, 165 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD); 166 167 if (status == CAM_REQ_CMP) { 168 struct ccb_setasync csa; 169 170 xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5); 171 csa.ccb_h.func_code = XPT_SASYNC_CB; 172 csa.event_enable = AC_PATH_REGISTERED; 173 csa.callback = targbhasync; 174 csa.callback_arg = NULL; 175 xpt_action((union ccb *)&csa); 176 status = csa.ccb_h.status; 177 xpt_free_path(path); 178 } 179 180 if (status != CAM_REQ_CMP) { 181 printf("targbh: Failed to attach master async callback " 182 "due to status 0x%x!\n", status); 183 } 184 } 185 186 static void 187 targbhasync(void *callback_arg, u_int32_t code, 188 struct cam_path *path, void *arg) 189 { 190 struct cam_periph *periph; 191 192 periph = (struct cam_periph *)callback_arg; 193 switch (code) { 194 case AC_PATH_REGISTERED: 195 { 196 struct ccb_pathinq *cpi; 197 struct cam_path *new_path; 198 cam_status status; 199 200 cpi = (struct ccb_pathinq *)arg; 201 202 /* Only attach to controllers that support target mode */ 203 if ((cpi->target_sprt & PIT_PROCESSOR) == 0) 204 break; 205 206 /* 207 * Allocate a peripheral instance for 208 * this target instance. 209 */ 210 status = xpt_create_path(&new_path, NULL, 211 xpt_path_path_id(path), 212 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD); 213 if (status != CAM_REQ_CMP) { 214 printf("targbhasync: Unable to create path " 215 "due to status 0x%x\n", status); 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 xpt_free_path(new_path); 225 if (status != CAM_REQ_CMP 226 && status != CAM_REQ_INPROG) 227 printf("targbhasync: Unable to allocate new periph " 228 "due to status 0x%x\n", status); 229 break; 230 } 231 case AC_PATH_DEREGISTERED: 232 { 233 targbhdislun(periph); 234 break; 235 } 236 default: 237 break; 238 } 239 } 240 241 /* Attempt to enable our lun */ 242 static cam_status 243 targbhenlun(struct cam_periph *periph) 244 { 245 union ccb immed_ccb; 246 struct targbh_softc *softc; 247 cam_status status; 248 int i; 249 250 softc = (struct targbh_softc *)periph->softc; 251 252 if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0) 253 return (CAM_REQ_CMP); 254 255 xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, /*priority*/1); 256 immed_ccb.ccb_h.func_code = XPT_EN_LUN; 257 258 /* Don't need support for any vendor specific commands */ 259 immed_ccb.cel.grp6_len = 0; 260 immed_ccb.cel.grp7_len = 0; 261 immed_ccb.cel.enable = 1; 262 xpt_action(&immed_ccb); 263 status = immed_ccb.ccb_h.status; 264 if (status != CAM_REQ_CMP) { 265 xpt_print_path(periph->path); 266 printf("targbhenlun - Enable Lun Rejected with status 0x%x\n", 267 status); 268 return (status); 269 } 270 271 softc->flags |= TARGBH_FLAG_LUN_ENABLED; 272 273 /* 274 * Build up a buffer of accept target I/O 275 * operations for incoming selections. 276 */ 277 for (i = 0; i < MAX_ACCEPT; i++) { 278 struct ccb_accept_tio *atio; 279 280 atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_DEVBUF, 281 M_NOWAIT); 282 if (atio == NULL) { 283 status = CAM_RESRC_UNAVAIL; 284 break; 285 } 286 287 atio->ccb_h.ccb_descr = targbhallocdescr(); 288 289 if (atio->ccb_h.ccb_descr == NULL) { 290 free(atio, M_DEVBUF); 291 status = CAM_RESRC_UNAVAIL; 292 break; 293 } 294 295 xpt_setup_ccb(&atio->ccb_h, periph->path, /*priority*/1); 296 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO; 297 atio->ccb_h.cbfcnp = targbhdone; 298 xpt_action((union ccb *)atio); 299 status = atio->ccb_h.status; 300 if (status != CAM_REQ_INPROG) { 301 targbhfreedescr(atio->ccb_h.ccb_descr); 302 free(atio, M_DEVBUF); 303 break; 304 } 305 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link = 306 softc->accept_tio_list; 307 softc->accept_tio_list = atio; 308 } 309 310 if (i == 0) { 311 xpt_print_path(periph->path); 312 printf("targbhenlun - Could not allocate accept tio CCBs: " 313 "status = 0x%x\n", status); 314 targbhdislun(periph); 315 return (CAM_REQ_CMP_ERR); 316 } 317 318 /* 319 * Build up a buffer of immediate notify CCBs 320 * so the SIM can tell us of asynchronous target mode events. 321 */ 322 for (i = 0; i < MAX_ACCEPT; i++) { 323 struct ccb_immed_notify *inot; 324 325 inot = (struct ccb_immed_notify*)malloc(sizeof(*inot), M_DEVBUF, 326 M_NOWAIT); 327 328 if (inot == NULL) { 329 status = CAM_RESRC_UNAVAIL; 330 break; 331 } 332 333 xpt_setup_ccb(&inot->ccb_h, periph->path, /*priority*/1); 334 inot->ccb_h.func_code = XPT_IMMED_NOTIFY; 335 inot->ccb_h.cbfcnp = targbhdone; 336 xpt_action((union ccb *)inot); 337 status = inot->ccb_h.status; 338 if (status != CAM_REQ_INPROG) { 339 free(inot, M_DEVBUF); 340 break; 341 } 342 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h, 343 periph_links.sle); 344 } 345 346 if (i == 0) { 347 xpt_print_path(periph->path); 348 printf("targbhenlun - Could not allocate immediate notify " 349 "CCBs: status = 0x%x\n", status); 350 targbhdislun(periph); 351 return (CAM_REQ_CMP_ERR); 352 } 353 354 return (CAM_REQ_CMP); 355 } 356 357 static cam_status 358 targbhdislun(struct cam_periph *periph) 359 { 360 union ccb ccb; 361 struct targbh_softc *softc; 362 struct ccb_accept_tio* atio; 363 struct ccb_hdr *ccb_h; 364 365 softc = (struct targbh_softc *)periph->softc; 366 if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0) 367 return CAM_REQ_CMP; 368 369 /* XXX Block for Continue I/O completion */ 370 371 /* Kill off all ACCECPT and IMMEDIATE CCBs */ 372 while ((atio = softc->accept_tio_list) != NULL) { 373 374 softc->accept_tio_list = 375 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link; 376 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1); 377 ccb.cab.ccb_h.func_code = XPT_ABORT; 378 ccb.cab.abort_ccb = (union ccb *)atio; 379 xpt_action(&ccb); 380 } 381 382 while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) { 383 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle); 384 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1); 385 ccb.cab.ccb_h.func_code = XPT_ABORT; 386 ccb.cab.abort_ccb = (union ccb *)ccb_h; 387 xpt_action(&ccb); 388 } 389 390 /* 391 * Dissable this lun. 392 */ 393 xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, /*priority*/1); 394 ccb.cel.ccb_h.func_code = XPT_EN_LUN; 395 ccb.cel.enable = 0; 396 xpt_action(&ccb); 397 398 if (ccb.cel.ccb_h.status != CAM_REQ_CMP) 399 printf("targbhdislun - Disabling lun on controller failed " 400 "with status 0x%x\n", ccb.cel.ccb_h.status); 401 else 402 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED; 403 return (ccb.cel.ccb_h.status); 404 } 405 406 static cam_status 407 targbhctor(struct cam_periph *periph, void *arg) 408 { 409 struct ccb_pathinq *cpi; 410 struct targbh_softc *softc; 411 412 cpi = (struct ccb_pathinq *)arg; 413 414 /* Allocate our per-instance private storage */ 415 softc = (struct targbh_softc *)malloc(sizeof(*softc), 416 M_DEVBUF, M_NOWAIT); 417 if (softc == NULL) { 418 printf("targctor: unable to malloc softc\n"); 419 return (CAM_REQ_CMP_ERR); 420 } 421 422 bzero(softc, sizeof(*softc)); 423 TAILQ_INIT(&softc->pending_queue); 424 TAILQ_INIT(&softc->work_queue); 425 softc->accept_tio_list = NULL; 426 SLIST_INIT(&softc->immed_notify_slist); 427 softc->state = TARGBH_STATE_NORMAL; 428 periph->softc = softc; 429 softc->init_level++; 430 431 return (targbhenlun(periph)); 432 } 433 434 static void 435 targbhdtor(struct cam_periph *periph) 436 { 437 struct targbh_softc *softc; 438 439 softc = (struct targbh_softc *)periph->softc; 440 441 softc->state = TARGBH_STATE_TEARDOWN; 442 443 targbhdislun(periph); 444 445 switch (softc->init_level) { 446 default: 447 /* FALLTHROUGH */ 448 case 1: 449 free(softc, M_DEVBUF); 450 break; 451 case 0: 452 panic("targdtor - impossible init level");; 453 } 454 } 455 456 static void 457 targbhstart(struct cam_periph *periph, union ccb *start_ccb) 458 { 459 struct targbh_softc *softc; 460 struct ccb_hdr *ccbh; 461 struct ccb_accept_tio *atio; 462 struct targbh_cmd_desc *desc; 463 struct ccb_scsiio *csio; 464 ccb_flags flags; 465 int s; 466 467 softc = (struct targbh_softc *)periph->softc; 468 469 s = splbio(); 470 ccbh = TAILQ_FIRST(&softc->work_queue); 471 if (periph->immediate_priority <= periph->pinfo.priority) { 472 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WAITING; 473 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h, 474 periph_links.sle); 475 periph->immediate_priority = CAM_PRIORITY_NONE; 476 splx(s); 477 wakeup(&periph->ccb_list); 478 } else if (ccbh == NULL) { 479 splx(s); 480 xpt_release_ccb(start_ccb); 481 } else { 482 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe); 483 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh, 484 periph_links.tqe); 485 splx(s); 486 atio = (struct ccb_accept_tio*)ccbh; 487 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr; 488 489 /* Is this a tagged request? */ 490 flags = atio->ccb_h.flags & (CAM_TAG_ACTION_VALID|CAM_DIR_MASK); 491 492 csio = &start_ccb->csio; 493 /* 494 * If we are done with the transaction, tell the 495 * controller to send status and perform a CMD_CMPLT. 496 * If we have associated sense data, see if we can 497 * send that too. 498 */ 499 if (desc->data_resid == desc->data_increment) { 500 flags |= CAM_SEND_STATUS; 501 if (atio->sense_len) { 502 csio->sense_len = atio->sense_len; 503 csio->sense_data = atio->sense_data; 504 flags |= CAM_SEND_SENSE; 505 } 506 507 } 508 509 cam_fill_ctio(csio, 510 /*retries*/2, 511 targbhdone, 512 flags, 513 (flags & CAM_TAG_ACTION_VALID)? 514 MSG_SIMPLE_Q_TAG : 0, 515 atio->tag_id, 516 atio->init_id, 517 desc->status, 518 /*data_ptr*/desc->data_increment == 0 519 ? NULL : desc->data, 520 /*dxfer_len*/desc->data_increment, 521 /*timeout*/desc->timeout); 522 523 /* Override our wildcard attachment */ 524 start_ccb->ccb_h.target_id = atio->ccb_h.target_id; 525 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun; 526 527 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ; 528 start_ccb->ccb_h.ccb_atio = atio; 529 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 530 ("Sending a CTIO\n")); 531 xpt_action(start_ccb); 532 s = splbio(); 533 ccbh = TAILQ_FIRST(&softc->work_queue); 534 splx(s); 535 } 536 if (ccbh != NULL) 537 xpt_schedule(periph, /*priority*/1); 538 } 539 540 static void 541 targbhdone(struct cam_periph *periph, union ccb *done_ccb) 542 { 543 struct targbh_softc *softc; 544 545 softc = (struct targbh_softc *)periph->softc; 546 547 if (done_ccb->ccb_h.ccb_type == TARGBH_CCB_WAITING) { 548 /* Caller will release the CCB */ 549 wakeup(&done_ccb->ccb_h.cbfcnp); 550 return; 551 } 552 553 switch (done_ccb->ccb_h.func_code) { 554 case XPT_ACCEPT_TARGET_IO: 555 { 556 struct ccb_accept_tio *atio; 557 struct targbh_cmd_desc *descr; 558 u_int8_t *cdb; 559 560 atio = &done_ccb->atio; 561 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr; 562 cdb = atio->cdb_io.cdb_bytes; 563 if (softc->state == TARGBH_STATE_TEARDOWN 564 || atio->ccb_h.status == CAM_REQ_ABORTED) { 565 targbhfreedescr(descr); 566 free(done_ccb, M_DEVBUF); 567 return; 568 } 569 570 /* 571 * Determine the type of incoming command and 572 * setup our buffer for a response. 573 */ 574 switch (cdb[0]) { 575 case INQUIRY: 576 { 577 struct scsi_inquiry *inq; 578 579 inq = (struct scsi_inquiry *)cdb; 580 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 581 ("Saw an inquiry!\n")); 582 /* 583 * Validate the command. We don't 584 * support any VPD pages, so complain 585 * if EVPD is set. 586 */ 587 if ((inq->byte2 & SI_EVPD) != 0 588 || inq->page_code != 0) { 589 atio->ccb_h.flags &= ~CAM_DIR_MASK; 590 atio->ccb_h.flags |= CAM_DIR_NONE; 591 /* 592 * This needs to have other than a 593 * no_lun_sense_data response. 594 */ 595 atio->sense_data = no_lun_sense_data; 596 atio->sense_len = sizeof(no_lun_sense_data); 597 descr->data_resid = 0; 598 descr->data_increment = 0; 599 descr->status = SCSI_STATUS_CHECK_COND; 600 break; 601 } 602 /* 603 * Direction is always relative 604 * to the initator. 605 */ 606 atio->ccb_h.flags &= ~CAM_DIR_MASK; 607 atio->ccb_h.flags |= CAM_DIR_IN; 608 descr->data = &no_lun_inq_data; 609 descr->data_resid = MIN(sizeof(no_lun_inq_data), 610 SCSI_CDB6_LEN(inq->length)); 611 descr->data_increment = descr->data_resid; 612 descr->timeout = 5 * 1000; 613 descr->status = SCSI_STATUS_OK; 614 break; 615 } 616 case REQUEST_SENSE: 617 { 618 struct scsi_request_sense *rsense; 619 620 rsense = (struct scsi_request_sense *)cdb; 621 /* Refer to static sense data */ 622 atio->ccb_h.flags &= ~CAM_DIR_MASK; 623 atio->ccb_h.flags |= CAM_DIR_IN; 624 descr->data = &no_lun_sense_data; 625 descr->data_resid = request_sense_size; 626 descr->data_resid = MIN(descr->data_resid, 627 SCSI_CDB6_LEN(rsense->length)); 628 descr->data_increment = descr->data_resid; 629 descr->timeout = 5 * 1000; 630 descr->status = SCSI_STATUS_OK; 631 break; 632 } 633 default: 634 /* Constant CA, tell initiator */ 635 /* Direction is always relative to the initator */ 636 atio->ccb_h.flags &= ~CAM_DIR_MASK; 637 atio->ccb_h.flags |= CAM_DIR_NONE; 638 atio->sense_data = no_lun_sense_data; 639 atio->sense_len = sizeof (no_lun_sense_data); 640 descr->data_resid = 0; 641 descr->data_increment = 0; 642 descr->timeout = 5 * 1000; 643 descr->status = SCSI_STATUS_CHECK_COND; 644 break; 645 } 646 647 /* Queue us up to receive a Continue Target I/O ccb. */ 648 TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h, 649 periph_links.tqe); 650 xpt_schedule(periph, /*priority*/1); 651 break; 652 } 653 case XPT_CONT_TARGET_IO: 654 { 655 struct ccb_accept_tio *atio; 656 struct targbh_cmd_desc *desc; 657 658 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 659 ("Received completed CTIO\n")); 660 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio; 661 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr; 662 663 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h, 664 periph_links.tqe); 665 666 /* 667 * We could check for CAM_SENT_SENSE bein set here, 668 * but since we're not maintaining any CA/UA state, 669 * there's no point. 670 */ 671 atio->sense_len = 0; 672 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE; 673 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE; 674 675 /* XXX Check for errors */ 676 desc->data_resid -= desc->data_increment; 677 xpt_release_ccb(done_ccb); 678 if (softc->state != TARGBH_STATE_TEARDOWN) { 679 680 /* 681 * Send the original accept TIO back to the 682 * controller to handle more work. 683 */ 684 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 685 ("Returning ATIO to target\n")); 686 /* Restore wildcards */ 687 atio->ccb_h.target_id = CAM_TARGET_WILDCARD; 688 atio->ccb_h.target_lun = CAM_LUN_WILDCARD; 689 xpt_action((union ccb *)atio); 690 break; 691 } else { 692 targbhfreedescr(desc); 693 free(atio, M_DEVBUF); 694 } 695 break; 696 } 697 case XPT_IMMED_NOTIFY: 698 { 699 if (softc->state == TARGBH_STATE_TEARDOWN 700 || done_ccb->ccb_h.status == CAM_REQ_ABORTED) { 701 printf("Freed an immediate notify\n"); 702 free(done_ccb, M_DEVBUF); 703 } 704 break; 705 } 706 default: 707 panic("targbhdone: Unexpected ccb opcode"); 708 break; 709 } 710 } 711 712 #ifdef NOTYET 713 static int 714 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags) 715 { 716 return 0; 717 } 718 #endif 719 720 static struct targbh_cmd_desc* 721 targbhallocdescr() 722 { 723 struct targbh_cmd_desc* descr; 724 725 /* Allocate the targbh_descr structure */ 726 descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr), 727 M_DEVBUF, M_NOWAIT); 728 if (descr == NULL) 729 return (NULL); 730 731 bzero(descr, sizeof(*descr)); 732 733 /* Allocate buffer backing store */ 734 descr->backing_store = malloc(MAX_BUF_SIZE, M_DEVBUF, M_NOWAIT); 735 if (descr->backing_store == NULL) { 736 free(descr, M_DEVBUF); 737 return (NULL); 738 } 739 descr->max_size = MAX_BUF_SIZE; 740 return (descr); 741 } 742 743 static void 744 targbhfreedescr(struct targbh_cmd_desc *descr) 745 { 746 free(descr->backing_store, M_DEVBUF); 747 free(descr, M_DEVBUF); 748 } 749