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 */ 30 #include <sys/param.h> 31 #include <sys/queue.h> 32 #include <sys/systm.h> 33 #include <sys/kernel.h> 34 #include <sys/types.h> 35 #include <sys/buf.h> 36 #include <sys/conf.h> 37 #include <sys/devicestat.h> 38 #include <sys/malloc.h> 39 #include <sys/uio.h> 40 41 #include "../cam.h" 42 #include "../cam_ccb.h" 43 #include "../cam_extend.h" 44 #include "../cam_periph.h" 45 #include "../cam_queue.h" 46 #include "../cam_xpt_periph.h" 47 #include "../cam_debug.h" 48 #include "../cam_sim.h" 49 50 #include "scsi_all.h" 51 #include "scsi_message.h" 52 53 MALLOC_DEFINE(M_SCSIBH, "SCSI bh", "SCSI blackhole buffers"); 54 55 typedef enum { 56 TARGBH_STATE_NORMAL, 57 TARGBH_STATE_EXCEPTION, 58 TARGBH_STATE_TEARDOWN 59 } targbh_state; 60 61 typedef enum { 62 TARGBH_FLAG_NONE = 0x00, 63 TARGBH_FLAG_LUN_ENABLED = 0x01 64 } targbh_flags; 65 66 typedef enum { 67 TARGBH_CCB_WORKQ, 68 TARGBH_CCB_WAITING 69 } targbh_ccb_types; 70 71 #define MAX_ACCEPT 8 72 #define MAX_IMMEDIATE 16 73 #define MAX_BUF_SIZE 256 /* Max inquiry/sense/mode page transfer */ 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 PERIPHDRIVER_DECLARE(targbh, targbhdriver); 153 154 static void 155 targbhinit(void) 156 { 157 cam_status status; 158 159 /* 160 * Install a global async callback. This callback will 161 * receive async callbacks like "new path registered". 162 */ 163 status = xpt_register_async(AC_PATH_REGISTERED | AC_PATH_DEREGISTERED, 164 targbhasync, NULL, NULL); 165 166 if (status != CAM_REQ_CMP) { 167 kprintf("targbh: Failed to attach master async callback " 168 "due to status 0x%x!\n", status); 169 } 170 } 171 172 static void 173 targbhasync(void *callback_arg, u_int32_t code, 174 struct cam_path *path, void *arg) 175 { 176 struct cam_path *new_path; 177 struct ccb_pathinq *cpi; 178 path_id_t bus_path_id; 179 cam_status status; 180 181 cpi = (struct ccb_pathinq *)arg; 182 if (code == AC_PATH_REGISTERED) 183 bus_path_id = cpi->ccb_h.path_id; 184 else 185 bus_path_id = xpt_path_path_id(path); 186 /* 187 * Allocate a peripheral instance for 188 * this target instance. 189 */ 190 status = xpt_create_path(&new_path, NULL, 191 bus_path_id, 192 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD); 193 if (status != CAM_REQ_CMP) { 194 kprintf("targbhasync: Unable to create path " 195 "due to status 0x%x\n", status); 196 return; 197 } 198 199 switch (code) { 200 case AC_PATH_REGISTERED: 201 { 202 /* Only attach to controllers that support target mode */ 203 if ((cpi->target_sprt & PIT_PROCESSOR) == 0) 204 break; 205 206 status = cam_periph_alloc(targbhctor, NULL, targbhdtor, 207 targbhstart, 208 "targbh", CAM_PERIPH_BIO, 209 new_path, targbhasync, 210 AC_PATH_REGISTERED, 211 cpi); 212 break; 213 } 214 case AC_PATH_DEREGISTERED: 215 { 216 struct cam_periph *periph; 217 218 if ((periph = cam_periph_find(new_path, "targbh")) != NULL) 219 cam_periph_invalidate(periph); 220 break; 221 } 222 default: 223 break; 224 } 225 xpt_free_path(new_path); 226 } 227 228 /* Attempt to enable our lun */ 229 static cam_status 230 targbhenlun(struct cam_periph *periph) 231 { 232 union ccb *immed_ccb; 233 struct targbh_softc *softc; 234 cam_status status; 235 int i; 236 237 softc = (struct targbh_softc *)periph->softc; 238 239 if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0) 240 return (CAM_REQ_CMP); 241 242 immed_ccb = xpt_alloc_ccb(); 243 xpt_setup_ccb(&immed_ccb->ccb_h, periph->path, /*priority*/1); 244 immed_ccb->ccb_h.func_code = XPT_EN_LUN; 245 246 /* Don't need support for any vendor specific commands */ 247 immed_ccb->cel.grp6_len = 0; 248 immed_ccb->cel.grp7_len = 0; 249 immed_ccb->cel.enable = 1; 250 xpt_action(immed_ccb); 251 status = immed_ccb->ccb_h.status; 252 xpt_free_ccb(&immed_ccb->ccb_h); 253 254 if (status != CAM_REQ_CMP) { 255 xpt_print(periph->path, 256 "targbhenlun - Enable Lun Rejected with status 0x%x\n", 257 status); 258 return (status); 259 } 260 261 softc->flags |= TARGBH_FLAG_LUN_ENABLED; 262 263 /* 264 * Build up a buffer of accept target I/O 265 * operations for incoming selections. 266 */ 267 for (i = 0; i < MAX_ACCEPT; i++) { 268 struct ccb_accept_tio *atio; 269 270 atio = &xpt_alloc_ccb()->atio; 271 atio->ccb_h.ccb_descr = targbhallocdescr(); 272 273 xpt_setup_ccb(&atio->ccb_h, periph->path, /*priority*/1); 274 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO; 275 atio->ccb_h.cbfcnp = targbhdone; 276 xpt_action((union ccb *)atio); 277 status = atio->ccb_h.status; 278 if (status != CAM_REQ_INPROG) { 279 targbhfreedescr(atio->ccb_h.ccb_descr); 280 xpt_free_ccb(&atio->ccb_h); 281 break; 282 } 283 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link = 284 softc->accept_tio_list; 285 softc->accept_tio_list = atio; 286 } 287 288 if (i == 0) { 289 xpt_print(periph->path, 290 "targbhenlun - Could not allocate accept tio CCBs: status " 291 "= 0x%x\n", status); 292 targbhdislun(periph); 293 return (CAM_REQ_CMP_ERR); 294 } 295 296 /* 297 * Build up a buffer of immediate notify CCBs 298 * so the SIM can tell us of asynchronous target mode events. 299 */ 300 for (i = 0; i < MAX_ACCEPT; i++) { 301 struct ccb_immed_notify *inot; 302 303 inot = &xpt_alloc_ccb()->cin; 304 305 xpt_setup_ccb(&inot->ccb_h, periph->path, /*priority*/1); 306 inot->ccb_h.func_code = XPT_IMMED_NOTIFY; 307 inot->ccb_h.cbfcnp = targbhdone; 308 xpt_action((union ccb *)inot); 309 status = inot->ccb_h.status; 310 if (status != CAM_REQ_INPROG) { 311 xpt_free_ccb(&inot->ccb_h); 312 break; 313 } 314 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h, 315 periph_links.sle); 316 } 317 318 if (i == 0) { 319 xpt_print(periph->path, 320 "targbhenlun - Could not allocate immediate notify " 321 "CCBs: status = 0x%x\n", status); 322 targbhdislun(periph); 323 return (CAM_REQ_CMP_ERR); 324 } 325 326 return (CAM_REQ_CMP); 327 } 328 329 static cam_status 330 targbhdislun(struct cam_periph *periph) 331 { 332 union ccb *ccb; 333 struct targbh_softc *softc; 334 struct ccb_accept_tio* atio; 335 struct ccb_hdr *ccb_h; 336 u_int32_t status; 337 338 softc = (struct targbh_softc *)periph->softc; 339 if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0) 340 return CAM_REQ_CMP; 341 342 /* XXX Block for Continue I/O completion */ 343 344 ccb = xpt_alloc_ccb(); 345 346 /* Kill off all ACCECPT and IMMEDIATE CCBs */ 347 while ((atio = softc->accept_tio_list) != NULL) { 348 softc->accept_tio_list = 349 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link; 350 xpt_setup_ccb(&ccb->cab.ccb_h, periph->path, /*priority*/1); 351 ccb->cab.ccb_h.func_code = XPT_ABORT; 352 ccb->cab.abort_ccb = (union ccb *)atio; 353 xpt_action(ccb); 354 } 355 356 while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) { 357 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle); 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 *)ccb_h; 361 xpt_action(ccb); 362 /* XXX xpt_free_ccb(ccb_h); needed? */ 363 } 364 365 /* 366 * Dissable this lun. 367 */ 368 xpt_setup_ccb(&ccb->cel.ccb_h, periph->path, /*priority*/1); 369 ccb->cel.ccb_h.func_code = XPT_EN_LUN; 370 ccb->cel.enable = 0; 371 xpt_action(ccb); 372 373 status = ccb->cel.ccb_h.status; 374 xpt_free_ccb(&ccb->ccb_h); 375 376 if (status != CAM_REQ_CMP) 377 kprintf("targbhdislun - Disabling lun on controller failed " 378 "with status 0x%x\n", status); 379 else 380 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED; 381 return (status); 382 } 383 384 static cam_status 385 targbhctor(struct cam_periph *periph, void *arg) 386 { 387 struct targbh_softc *softc; 388 389 /* Allocate our per-instance private storage */ 390 softc = kmalloc(sizeof(*softc), M_SCSIBH, M_INTWAIT | M_ZERO); 391 TAILQ_INIT(&softc->pending_queue); 392 TAILQ_INIT(&softc->work_queue); 393 softc->accept_tio_list = NULL; 394 SLIST_INIT(&softc->immed_notify_slist); 395 softc->state = TARGBH_STATE_NORMAL; 396 periph->softc = softc; 397 softc->init_level++; 398 399 return (targbhenlun(periph)); 400 } 401 402 static void 403 targbhdtor(struct cam_periph *periph) 404 { 405 struct targbh_softc *softc; 406 407 softc = (struct targbh_softc *)periph->softc; 408 409 softc->state = TARGBH_STATE_TEARDOWN; 410 411 targbhdislun(periph); 412 413 switch (softc->init_level) { 414 case 0: 415 panic("targdtor - impossible init level"); 416 case 1: 417 /* FALLTHROUGH */ 418 default: 419 /* XXX Wait for callback of targbhdislun() */ 420 sim_lock_sleep(softc, 0, "targbh", hz/2, periph->sim->lock); 421 kfree(softc, M_SCSIBH); 422 break; 423 } 424 } 425 426 static void 427 targbhstart(struct cam_periph *periph, union ccb *start_ccb) 428 { 429 struct targbh_softc *softc; 430 struct ccb_hdr *ccbh; 431 struct ccb_accept_tio *atio; 432 struct targbh_cmd_desc *desc; 433 struct ccb_scsiio *csio; 434 ccb_flags flags; 435 436 softc = (struct targbh_softc *)periph->softc; 437 438 ccbh = TAILQ_FIRST(&softc->work_queue); 439 if (periph->immediate_priority <= periph->pinfo.priority) { 440 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WAITING; 441 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h, 442 periph_links.sle); 443 periph->immediate_priority = CAM_PRIORITY_NONE; 444 wakeup(&periph->ccb_list); 445 } else if (ccbh == NULL) { 446 xpt_release_ccb(start_ccb); 447 } else { 448 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe); 449 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh, 450 periph_links.tqe); 451 atio = (struct ccb_accept_tio*)ccbh; 452 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr; 453 454 /* Is this a tagged request? */ 455 flags = atio->ccb_h.flags & 456 (CAM_DIS_DISCONNECT|CAM_TAG_ACTION_VALID|CAM_DIR_MASK); 457 458 csio = &start_ccb->csio; 459 /* 460 * If we are done with the transaction, tell the 461 * controller to send status and perform a CMD_CMPLT. 462 * If we have associated sense data, see if we can 463 * send that too. 464 */ 465 if (desc->data_resid == desc->data_increment) { 466 flags |= CAM_SEND_STATUS; 467 if (atio->sense_len) { 468 csio->sense_len = atio->sense_len; 469 csio->sense_data = atio->sense_data; 470 flags |= CAM_SEND_SENSE; 471 } 472 473 } 474 475 cam_fill_ctio(csio, 476 /*retries*/2, 477 targbhdone, 478 flags, 479 (flags & CAM_TAG_ACTION_VALID)? 480 MSG_SIMPLE_Q_TAG : 0, 481 atio->tag_id, 482 atio->init_id, 483 desc->status, 484 /*data_ptr*/desc->data_increment == 0 485 ? NULL : desc->data, 486 /*dxfer_len*/desc->data_increment, 487 /*timeout*/desc->timeout); 488 489 /* Override our wildcard attachment */ 490 start_ccb->ccb_h.target_id = atio->ccb_h.target_id; 491 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun; 492 493 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ; 494 start_ccb->ccb_h.ccb_atio = atio; 495 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 496 ("Sending a CTIO\n")); 497 xpt_action(start_ccb); 498 /* 499 * If the queue was frozen waiting for the response 500 * to this ATIO (for instance disconnection was disallowed), 501 * then release it now that our response has been queued. 502 */ 503 if ((atio->ccb_h.status & CAM_DEV_QFRZN) != 0) { 504 cam_release_devq(periph->path, 505 /*relsim_flags*/0, 506 /*reduction*/0, 507 /*timeout*/0, 508 /*getcount_only*/0); 509 atio->ccb_h.status &= ~CAM_DEV_QFRZN; 510 } 511 ccbh = TAILQ_FIRST(&softc->work_queue); 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 int priority; 537 538 atio = &done_ccb->atio; 539 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr; 540 cdb = atio->cdb_io.cdb_bytes; 541 if (softc->state == TARGBH_STATE_TEARDOWN 542 || atio->ccb_h.status == CAM_REQ_ABORTED) { 543 targbhfreedescr(descr); 544 xpt_free_ccb(&done_ccb->ccb_h); 545 return; 546 } 547 548 /* 549 * Determine the type of incoming command and 550 * setup our buffer for a response. 551 */ 552 switch (cdb[0]) { 553 case INQUIRY: 554 { 555 struct scsi_inquiry *inq; 556 557 inq = (struct scsi_inquiry *)cdb; 558 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 559 ("Saw an inquiry!\n")); 560 /* 561 * Validate the command. We don't 562 * support any VPD pages, so complain 563 * if EVPD is set. 564 */ 565 if ((inq->byte2 & SI_EVPD) != 0 566 || inq->page_code != 0) { 567 atio->ccb_h.flags &= ~CAM_DIR_MASK; 568 atio->ccb_h.flags |= CAM_DIR_NONE; 569 /* 570 * This needs to have other than a 571 * no_lun_sense_data response. 572 */ 573 atio->sense_data = no_lun_sense_data; 574 atio->sense_len = sizeof(no_lun_sense_data); 575 descr->data_resid = 0; 576 descr->data_increment = 0; 577 descr->status = SCSI_STATUS_CHECK_COND; 578 break; 579 } 580 /* 581 * Direction is always relative 582 * to the initator. 583 */ 584 atio->ccb_h.flags &= ~CAM_DIR_MASK; 585 atio->ccb_h.flags |= CAM_DIR_IN; 586 descr->data = &no_lun_inq_data; 587 descr->data_resid = MIN(sizeof(no_lun_inq_data), 588 SCSI_CDB6_LEN(inq->length)); 589 descr->data_increment = descr->data_resid; 590 descr->timeout = 5 * 1000; 591 descr->status = SCSI_STATUS_OK; 592 break; 593 } 594 case REQUEST_SENSE: 595 { 596 struct scsi_request_sense *rsense; 597 598 rsense = (struct scsi_request_sense *)cdb; 599 /* Refer to static sense data */ 600 atio->ccb_h.flags &= ~CAM_DIR_MASK; 601 atio->ccb_h.flags |= CAM_DIR_IN; 602 descr->data = &no_lun_sense_data; 603 descr->data_resid = request_sense_size; 604 descr->data_resid = MIN(descr->data_resid, 605 SCSI_CDB6_LEN(rsense->length)); 606 descr->data_increment = descr->data_resid; 607 descr->timeout = 5 * 1000; 608 descr->status = SCSI_STATUS_OK; 609 break; 610 } 611 default: 612 /* Constant CA, tell initiator */ 613 /* Direction is always relative to the initator */ 614 atio->ccb_h.flags &= ~CAM_DIR_MASK; 615 atio->ccb_h.flags |= CAM_DIR_NONE; 616 atio->sense_data = no_lun_sense_data; 617 atio->sense_len = sizeof (no_lun_sense_data); 618 descr->data_resid = 0; 619 descr->data_increment = 0; 620 descr->timeout = 5 * 1000; 621 descr->status = SCSI_STATUS_CHECK_COND; 622 break; 623 } 624 625 /* Queue us up to receive a Continue Target I/O ccb. */ 626 if ((atio->ccb_h.flags & CAM_DIS_DISCONNECT) != 0) { 627 TAILQ_INSERT_HEAD(&softc->work_queue, &atio->ccb_h, 628 periph_links.tqe); 629 priority = 0; 630 } else { 631 TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h, 632 periph_links.tqe); 633 priority = 1; 634 } 635 xpt_schedule(periph, priority); 636 break; 637 } 638 case XPT_CONT_TARGET_IO: 639 { 640 struct ccb_accept_tio *atio; 641 struct targbh_cmd_desc *desc; 642 643 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 644 ("Received completed CTIO\n")); 645 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio; 646 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr; 647 648 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h, 649 periph_links.tqe); 650 651 /* 652 * We could check for CAM_SENT_SENSE bein set here, 653 * but since we're not maintaining any CA/UA state, 654 * there's no point. 655 */ 656 atio->sense_len = 0; 657 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE; 658 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE; 659 660 /* 661 * Any errors will not change the data we return, 662 * so make sure the queue is not left frozen. 663 * XXX - At some point there may be errors that 664 * leave us in a connected state with the 665 * initiator... 666 */ 667 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) { 668 kprintf("Releasing Queue\n"); 669 cam_release_devq(done_ccb->ccb_h.path, 670 /*relsim_flags*/0, 671 /*reduction*/0, 672 /*timeout*/0, 673 /*getcount_only*/0); 674 done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN; 675 } 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 xpt_free_ccb(&atio->ccb_h); 694 } 695 break; 696 } 697 case XPT_IMMED_NOTIFY: 698 { 699 int frozen; 700 701 frozen = (done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0; 702 if (softc->state == TARGBH_STATE_TEARDOWN 703 || done_ccb->ccb_h.status == CAM_REQ_ABORTED) { 704 kprintf("Freed an immediate notify\n"); 705 xpt_free_ccb(&done_ccb->ccb_h); 706 } else { 707 /* Requeue for another immediate event */ 708 xpt_action(done_ccb); 709 } 710 if (frozen != 0) 711 cam_release_devq(periph->path, 712 /*relsim_flags*/0, 713 /*opening reduction*/0, 714 /*timeout*/0, 715 /*getcount_only*/0); 716 break; 717 } 718 default: 719 panic("targbhdone: Unexpected ccb opcode"); 720 break; 721 } 722 } 723 724 #ifdef NOTYET 725 static int 726 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags) 727 { 728 return 0; 729 } 730 #endif 731 732 static struct targbh_cmd_desc * 733 targbhallocdescr(void) 734 { 735 struct targbh_cmd_desc* descr; 736 737 /* Allocate the targbh_descr structure */ 738 descr = kmalloc(sizeof(*descr), M_SCSIBH, M_INTWAIT | M_ZERO); 739 740 /* Allocate buffer backing store */ 741 descr->backing_store = kmalloc(MAX_BUF_SIZE, M_SCSIBH, M_INTWAIT); 742 descr->max_size = MAX_BUF_SIZE; 743 return (descr); 744 } 745 746 static void 747 targbhfreedescr(struct targbh_cmd_desc *descr) 748 { 749 kfree(descr->backing_store, M_SCSIBH); 750 kfree(descr, M_SCSIBH); 751 } 752