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 } 717