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 1.18 2007/12/01 22:21:18 pavalos 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/thread2.h> 41 #include <sys/uio.h> 42 43 #include "../cam.h" 44 #include "../cam_ccb.h" 45 #include "../cam_extend.h" 46 #include "../cam_periph.h" 47 #include "../cam_queue.h" 48 #include "../cam_xpt_periph.h" 49 #include "../cam_debug.h" 50 51 #include "scsi_all.h" 52 #include "scsi_message.h" 53 54 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 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, fru) 122 - offsetof(struct scsi_sense_data, 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, 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 struct cam_path *path; 160 161 /* 162 * Install a global async callback. This callback will 163 * receive async callbacks like "new path registered". 164 */ 165 status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID, 166 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD); 167 168 if (status == CAM_REQ_CMP) { 169 struct ccb_setasync csa; 170 171 xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5); 172 csa.ccb_h.func_code = XPT_SASYNC_CB; 173 csa.event_enable = AC_PATH_REGISTERED | AC_PATH_DEREGISTERED; 174 csa.callback = targbhasync; 175 csa.callback_arg = NULL; 176 xpt_action((union ccb *)&csa); 177 status = csa.ccb_h.status; 178 xpt_free_path(path); 179 } 180 181 if (status != CAM_REQ_CMP) { 182 kprintf("targbh: Failed to attach master async callback " 183 "due to status 0x%x!\n", status); 184 } 185 } 186 187 static void 188 targbhasync(void *callback_arg, u_int32_t code, 189 struct cam_path *path, void *arg) 190 { 191 struct cam_path *new_path; 192 struct ccb_pathinq *cpi; 193 path_id_t bus_path_id; 194 cam_status status; 195 196 cpi = (struct ccb_pathinq *)arg; 197 if (code == AC_PATH_REGISTERED) 198 bus_path_id = cpi->ccb_h.path_id; 199 else 200 bus_path_id = xpt_path_path_id(path); 201 /* 202 * Allocate a peripheral instance for 203 * this target instance. 204 */ 205 status = xpt_create_path(&new_path, NULL, 206 bus_path_id, 207 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD); 208 if (status != CAM_REQ_CMP) { 209 kprintf("targbhasync: Unable to create path " 210 "due to status 0x%x\n", status); 211 return; 212 } 213 214 switch (code) { 215 case AC_PATH_REGISTERED: 216 { 217 /* Only attach to controllers that support target mode */ 218 if ((cpi->target_sprt & PIT_PROCESSOR) == 0) 219 break; 220 221 status = cam_periph_alloc(targbhctor, NULL, targbhdtor, 222 targbhstart, 223 "targbh", CAM_PERIPH_BIO, 224 new_path, targbhasync, 225 AC_PATH_REGISTERED, 226 cpi); 227 break; 228 } 229 case AC_PATH_DEREGISTERED: 230 { 231 struct cam_periph *periph; 232 233 if ((periph = cam_periph_find(new_path, "targbh")) != NULL) 234 cam_periph_invalidate(periph); 235 break; 236 } 237 default: 238 break; 239 } 240 xpt_free_path(new_path); 241 } 242 243 /* Attempt to enable our lun */ 244 static cam_status 245 targbhenlun(struct cam_periph *periph) 246 { 247 union ccb immed_ccb; 248 struct targbh_softc *softc; 249 cam_status status; 250 int i; 251 252 softc = (struct targbh_softc *)periph->softc; 253 254 if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0) 255 return (CAM_REQ_CMP); 256 257 xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, /*priority*/1); 258 immed_ccb.ccb_h.func_code = XPT_EN_LUN; 259 260 /* Don't need support for any vendor specific commands */ 261 immed_ccb.cel.grp6_len = 0; 262 immed_ccb.cel.grp7_len = 0; 263 immed_ccb.cel.enable = 1; 264 xpt_action(&immed_ccb); 265 status = immed_ccb.ccb_h.status; 266 if (status != CAM_REQ_CMP) { 267 xpt_print_path(periph->path); 268 kprintf("targbhenlun - Enable Lun Rejected with status 0x%x\n", 269 status); 270 return (status); 271 } 272 273 softc->flags |= TARGBH_FLAG_LUN_ENABLED; 274 275 /* 276 * Build up a buffer of accept target I/O 277 * operations for incoming selections. 278 */ 279 for (i = 0; i < MAX_ACCEPT; i++) { 280 struct ccb_accept_tio *atio; 281 282 atio = kmalloc(sizeof(*atio), M_SCSIBH, M_INTWAIT); 283 284 atio->ccb_h.ccb_descr = targbhallocdescr(); 285 286 xpt_setup_ccb(&atio->ccb_h, periph->path, /*priority*/1); 287 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO; 288 atio->ccb_h.cbfcnp = targbhdone; 289 xpt_action((union ccb *)atio); 290 status = atio->ccb_h.status; 291 if (status != CAM_REQ_INPROG) { 292 targbhfreedescr(atio->ccb_h.ccb_descr); 293 kfree(atio, M_SCSIBH); 294 break; 295 } 296 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link = 297 softc->accept_tio_list; 298 softc->accept_tio_list = atio; 299 } 300 301 if (i == 0) { 302 xpt_print_path(periph->path); 303 kprintf("targbhenlun - Could not allocate accept tio CCBs: " 304 "status = 0x%x\n", status); 305 targbhdislun(periph); 306 return (CAM_REQ_CMP_ERR); 307 } 308 309 /* 310 * Build up a buffer of immediate notify CCBs 311 * so the SIM can tell us of asynchronous target mode events. 312 */ 313 for (i = 0; i < MAX_ACCEPT; i++) { 314 struct ccb_immed_notify *inot; 315 316 inot = kmalloc(sizeof(*inot), M_SCSIBH, M_INTWAIT); 317 318 xpt_setup_ccb(&inot->ccb_h, periph->path, /*priority*/1); 319 inot->ccb_h.func_code = XPT_IMMED_NOTIFY; 320 inot->ccb_h.cbfcnp = targbhdone; 321 xpt_action((union ccb *)inot); 322 status = inot->ccb_h.status; 323 if (status != CAM_REQ_INPROG) { 324 kfree(inot, M_SCSIBH); 325 break; 326 } 327 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h, 328 periph_links.sle); 329 } 330 331 if (i == 0) { 332 xpt_print_path(periph->path); 333 kprintf("targbhenlun - Could not allocate immediate notify " 334 "CCBs: status = 0x%x\n", status); 335 targbhdislun(periph); 336 return (CAM_REQ_CMP_ERR); 337 } 338 339 return (CAM_REQ_CMP); 340 } 341 342 static cam_status 343 targbhdislun(struct cam_periph *periph) 344 { 345 union ccb ccb; 346 struct targbh_softc *softc; 347 struct ccb_accept_tio* atio; 348 struct ccb_hdr *ccb_h; 349 350 softc = (struct targbh_softc *)periph->softc; 351 if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0) 352 return CAM_REQ_CMP; 353 354 /* XXX Block for Continue I/O completion */ 355 356 /* Kill off all ACCECPT and IMMEDIATE CCBs */ 357 while ((atio = softc->accept_tio_list) != NULL) { 358 359 softc->accept_tio_list = 360 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link; 361 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1); 362 ccb.cab.ccb_h.func_code = XPT_ABORT; 363 ccb.cab.abort_ccb = (union ccb *)atio; 364 xpt_action(&ccb); 365 } 366 367 while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) { 368 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle); 369 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1); 370 ccb.cab.ccb_h.func_code = XPT_ABORT; 371 ccb.cab.abort_ccb = (union ccb *)ccb_h; 372 xpt_action(&ccb); 373 } 374 375 /* 376 * Dissable this lun. 377 */ 378 xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, /*priority*/1); 379 ccb.cel.ccb_h.func_code = XPT_EN_LUN; 380 ccb.cel.enable = 0; 381 xpt_action(&ccb); 382 383 if (ccb.cel.ccb_h.status != CAM_REQ_CMP) 384 kprintf("targbhdislun - Disabling lun on controller failed " 385 "with status 0x%x\n", ccb.cel.ccb_h.status); 386 else 387 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED; 388 return (ccb.cel.ccb_h.status); 389 } 390 391 static cam_status 392 targbhctor(struct cam_periph *periph, void *arg) 393 { 394 struct targbh_softc *softc; 395 396 /* Allocate our per-instance private storage */ 397 softc = kmalloc(sizeof(*softc), M_SCSIBH, 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 kfree(softc, M_SCSIBH); 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; 442 443 softc = (struct targbh_softc *)periph->softc; 444 445 crit_enter(); 446 ccbh = TAILQ_FIRST(&softc->work_queue); 447 if (periph->immediate_priority <= periph->pinfo.priority) { 448 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WAITING; 449 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h, 450 periph_links.sle); 451 periph->immediate_priority = CAM_PRIORITY_NONE; 452 crit_exit(); 453 wakeup(&periph->ccb_list); 454 } else if (ccbh == NULL) { 455 crit_exit(); 456 xpt_release_ccb(start_ccb); 457 } else { 458 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe); 459 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh, 460 periph_links.tqe); 461 crit_exit(); 462 atio = (struct ccb_accept_tio*)ccbh; 463 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr; 464 465 /* Is this a tagged request? */ 466 flags = atio->ccb_h.flags & 467 (CAM_DIS_DISCONNECT|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 /* 510 * If the queue was frozen waiting for the response 511 * to this ATIO (for instance disconnection was disallowed), 512 * then release it now that our response has been queued. 513 */ 514 if ((atio->ccb_h.status & CAM_DEV_QFRZN) != 0) { 515 cam_release_devq(periph->path, 516 /*relsim_flags*/0, 517 /*reduction*/0, 518 /*timeout*/0, 519 /*getcount_only*/0); 520 atio->ccb_h.status &= ~CAM_DEV_QFRZN; 521 } 522 crit_enter(); 523 ccbh = TAILQ_FIRST(&softc->work_queue); 524 crit_exit(); 525 } 526 if (ccbh != NULL) 527 xpt_schedule(periph, /*priority*/1); 528 } 529 530 static void 531 targbhdone(struct cam_periph *periph, union ccb *done_ccb) 532 { 533 struct targbh_softc *softc; 534 535 softc = (struct targbh_softc *)periph->softc; 536 537 if (done_ccb->ccb_h.ccb_type == TARGBH_CCB_WAITING) { 538 /* Caller will release the CCB */ 539 wakeup(&done_ccb->ccb_h.cbfcnp); 540 return; 541 } 542 543 switch (done_ccb->ccb_h.func_code) { 544 case XPT_ACCEPT_TARGET_IO: 545 { 546 struct ccb_accept_tio *atio; 547 struct targbh_cmd_desc *descr; 548 u_int8_t *cdb; 549 int priority; 550 551 atio = &done_ccb->atio; 552 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr; 553 cdb = atio->cdb_io.cdb_bytes; 554 if (softc->state == TARGBH_STATE_TEARDOWN 555 || atio->ccb_h.status == CAM_REQ_ABORTED) { 556 targbhfreedescr(descr); 557 xpt_free_ccb(done_ccb); 558 return; 559 } 560 561 /* 562 * Determine the type of incoming command and 563 * setup our buffer for a response. 564 */ 565 switch (cdb[0]) { 566 case INQUIRY: 567 { 568 struct scsi_inquiry *inq; 569 570 inq = (struct scsi_inquiry *)cdb; 571 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 572 ("Saw an inquiry!\n")); 573 /* 574 * Validate the command. We don't 575 * support any VPD pages, so complain 576 * if EVPD is set. 577 */ 578 if ((inq->byte2 & SI_EVPD) != 0 579 || inq->page_code != 0) { 580 atio->ccb_h.flags &= ~CAM_DIR_MASK; 581 atio->ccb_h.flags |= CAM_DIR_NONE; 582 /* 583 * This needs to have other than a 584 * no_lun_sense_data response. 585 */ 586 atio->sense_data = no_lun_sense_data; 587 atio->sense_len = sizeof(no_lun_sense_data); 588 descr->data_resid = 0; 589 descr->data_increment = 0; 590 descr->status = SCSI_STATUS_CHECK_COND; 591 break; 592 } 593 /* 594 * Direction is always relative 595 * to the initator. 596 */ 597 atio->ccb_h.flags &= ~CAM_DIR_MASK; 598 atio->ccb_h.flags |= CAM_DIR_IN; 599 descr->data = &no_lun_inq_data; 600 descr->data_resid = MIN(sizeof(no_lun_inq_data), 601 SCSI_CDB6_LEN(inq->length)); 602 descr->data_increment = descr->data_resid; 603 descr->timeout = 5 * 1000; 604 descr->status = SCSI_STATUS_OK; 605 break; 606 } 607 case REQUEST_SENSE: 608 { 609 struct scsi_request_sense *rsense; 610 611 rsense = (struct scsi_request_sense *)cdb; 612 /* Refer to static sense data */ 613 atio->ccb_h.flags &= ~CAM_DIR_MASK; 614 atio->ccb_h.flags |= CAM_DIR_IN; 615 descr->data = &no_lun_sense_data; 616 descr->data_resid = request_sense_size; 617 descr->data_resid = MIN(descr->data_resid, 618 SCSI_CDB6_LEN(rsense->length)); 619 descr->data_increment = descr->data_resid; 620 descr->timeout = 5 * 1000; 621 descr->status = SCSI_STATUS_OK; 622 break; 623 } 624 default: 625 /* Constant CA, tell initiator */ 626 /* Direction is always relative to the initator */ 627 atio->ccb_h.flags &= ~CAM_DIR_MASK; 628 atio->ccb_h.flags |= CAM_DIR_NONE; 629 atio->sense_data = no_lun_sense_data; 630 atio->sense_len = sizeof (no_lun_sense_data); 631 descr->data_resid = 0; 632 descr->data_increment = 0; 633 descr->timeout = 5 * 1000; 634 descr->status = SCSI_STATUS_CHECK_COND; 635 break; 636 } 637 638 /* Queue us up to receive a Continue Target I/O ccb. */ 639 if ((atio->ccb_h.flags & CAM_DIS_DISCONNECT) != 0) { 640 TAILQ_INSERT_HEAD(&softc->work_queue, &atio->ccb_h, 641 periph_links.tqe); 642 priority = 0; 643 } else { 644 TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h, 645 periph_links.tqe); 646 priority = 1; 647 } 648 xpt_schedule(periph, priority); 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 /* 674 * Any errors will not change the data we return, 675 * so make sure the queue is not left frozen. 676 * XXX - At some point there may be errors that 677 * leave us in a connected state with the 678 * initiator... 679 */ 680 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) { 681 kprintf("Releasing Queue\n"); 682 cam_release_devq(done_ccb->ccb_h.path, 683 /*relsim_flags*/0, 684 /*reduction*/0, 685 /*timeout*/0, 686 /*getcount_only*/0); 687 done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN; 688 } 689 desc->data_resid -= desc->data_increment; 690 xpt_release_ccb(done_ccb); 691 if (softc->state != TARGBH_STATE_TEARDOWN) { 692 693 /* 694 * Send the original accept TIO back to the 695 * controller to handle more work. 696 */ 697 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 698 ("Returning ATIO to target\n")); 699 /* Restore wildcards */ 700 atio->ccb_h.target_id = CAM_TARGET_WILDCARD; 701 atio->ccb_h.target_lun = CAM_LUN_WILDCARD; 702 xpt_action((union ccb *)atio); 703 break; 704 } else { 705 targbhfreedescr(desc); 706 kfree(atio, M_SCSIBH); 707 } 708 break; 709 } 710 case XPT_IMMED_NOTIFY: 711 { 712 int frozen; 713 714 frozen = (done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0; 715 if (softc->state == TARGBH_STATE_TEARDOWN 716 || done_ccb->ccb_h.status == CAM_REQ_ABORTED) { 717 kprintf("Freed an immediate notify\n"); 718 xpt_free_ccb(done_ccb); 719 } else { 720 /* Requeue for another immediate event */ 721 xpt_action(done_ccb); 722 } 723 if (frozen != 0) 724 cam_release_devq(periph->path, 725 /*relsim_flags*/0, 726 /*opening reduction*/0, 727 /*timeout*/0, 728 /*getcount_only*/0); 729 break; 730 } 731 default: 732 panic("targbhdone: Unexpected ccb opcode"); 733 break; 734 } 735 } 736 737 #ifdef NOTYET 738 static int 739 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags) 740 { 741 return 0; 742 } 743 #endif 744 745 static struct targbh_cmd_desc * 746 targbhallocdescr(void) 747 { 748 struct targbh_cmd_desc* descr; 749 750 /* Allocate the targbh_descr structure */ 751 descr = kmalloc(sizeof(*descr), M_SCSIBH, M_INTWAIT | M_ZERO); 752 753 /* Allocate buffer backing store */ 754 descr->backing_store = kmalloc(MAX_BUF_SIZE, M_SCSIBH, M_INTWAIT); 755 descr->max_size = MAX_BUF_SIZE; 756 return (descr); 757 } 758 759 static void 760 targbhfreedescr(struct targbh_cmd_desc *descr) 761 { 762 kfree(descr->backing_store, M_SCSIBH); 763 kfree(descr, M_SCSIBH); 764 } 765