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sys/cam/scsi/scsi_targ_bh.c
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1 /*- 2 * Implementation of the Target Mode 'Black Hole device' for CAM. 3 * 4 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 5 * 6 * Copyright (c) 1999 Justin T. Gibbs. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions, and the following disclaimer, 14 * without modification, immediately at the beginning of the file. 15 * 2. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 22 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 __FBSDID("$FreeBSD$"); 33 34 #include <sys/param.h> 35 #include <sys/queue.h> 36 #include <sys/systm.h> 37 #include <sys/kernel.h> 38 #include <sys/types.h> 39 #include <sys/bio.h> 40 #include <sys/conf.h> 41 #include <sys/devicestat.h> 42 #include <sys/malloc.h> 43 #include <sys/uio.h> 44 45 #include <cam/cam.h> 46 #include <cam/cam_ccb.h> 47 #include <cam/cam_periph.h> 48 #include <cam/cam_queue.h> 49 #include <cam/cam_xpt_periph.h> 50 #include <cam/cam_debug.h> 51 #include <cam/cam_sim.h> 52 53 #include <cam/scsi/scsi_all.h> 54 #include <cam/scsi/scsi_message.h> 55 56 static MALLOC_DEFINE(M_SCSIBH, "SCSI bh", "SCSI blackhole buffers"); 57 58 typedef enum { 59 TARGBH_STATE_NORMAL, 60 TARGBH_STATE_EXCEPTION, 61 TARGBH_STATE_TEARDOWN 62 } targbh_state; 63 64 typedef enum { 65 TARGBH_FLAG_NONE = 0x00, 66 TARGBH_FLAG_LUN_ENABLED = 0x01 67 } targbh_flags; 68 69 typedef enum { 70 TARGBH_CCB_WORKQ 71 } targbh_ccb_types; 72 73 #define MAX_ACCEPT 8 74 #define MAX_IMMEDIATE 16 75 #define MAX_BUF_SIZE 256 /* Max inquiry/sense/mode page transfer */ 76 77 /* Offsets into our private CCB area for storing accept information */ 78 #define ccb_type ppriv_field0 79 #define ccb_descr ppriv_ptr1 80 81 /* We stick a pointer to the originating accept TIO in each continue I/O CCB */ 82 #define ccb_atio ppriv_ptr1 83 84 TAILQ_HEAD(ccb_queue, ccb_hdr); 85 86 struct targbh_softc { 87 struct ccb_queue pending_queue; 88 struct ccb_queue work_queue; 89 struct ccb_queue unknown_atio_queue; 90 struct devstat device_stats; 91 targbh_state state; 92 targbh_flags flags; 93 u_int init_level; 94 u_int inq_data_len; 95 struct ccb_accept_tio *accept_tio_list; 96 struct ccb_hdr_slist immed_notify_slist; 97 }; 98 99 struct targbh_cmd_desc { 100 struct ccb_accept_tio* atio_link; 101 u_int data_resid; /* How much left to transfer */ 102 u_int data_increment;/* Amount to send before next disconnect */ 103 void* data; /* The data. Can be from backing_store or not */ 104 void* backing_store;/* Backing store allocated for this descriptor*/ 105 u_int max_size; /* Size of backing_store */ 106 u_int32_t timeout; 107 u_int8_t status; /* Status to return to initiator */ 108 }; 109 110 static struct scsi_inquiry_data no_lun_inq_data = 111 { 112 T_NODEVICE | (SID_QUAL_BAD_LU << 5), 0, 113 /* version */2, /* format version */2 114 }; 115 116 static struct scsi_sense_data_fixed no_lun_sense_data = 117 { 118 SSD_CURRENT_ERROR|SSD_ERRCODE_VALID, 119 0, 120 SSD_KEY_NOT_READY, 121 { 0, 0, 0, 0 }, 122 /*extra_len*/offsetof(struct scsi_sense_data_fixed, fru) 123 - offsetof(struct scsi_sense_data_fixed, extra_len), 124 { 0, 0, 0, 0 }, 125 /* Logical Unit Not Supported */ 126 /*ASC*/0x25, /*ASCQ*/ 127 }; 128 129 static const int request_sense_size = offsetof(struct scsi_sense_data_fixed, fru); 130 131 static periph_init_t targbhinit; 132 static void targbhasync(void *callback_arg, u_int32_t code, 133 struct cam_path *path, void *arg); 134 static cam_status targbhenlun(struct cam_periph *periph); 135 static cam_status targbhdislun(struct cam_periph *periph); 136 static periph_ctor_t targbhctor; 137 static periph_dtor_t targbhdtor; 138 static periph_start_t targbhstart; 139 static void targbhdone(struct cam_periph *periph, 140 union ccb *done_ccb); 141 #ifdef NOTYET 142 static int targbherror(union ccb *ccb, u_int32_t cam_flags, 143 u_int32_t sense_flags); 144 #endif 145 static struct targbh_cmd_desc* targbhallocdescr(void); 146 static void targbhfreedescr(struct targbh_cmd_desc *buf); 147 148 static struct periph_driver targbhdriver = 149 { 150 targbhinit, "targbh", 151 TAILQ_HEAD_INITIALIZER(targbhdriver.units), /* generation */ 0 152 }; 153 154 PERIPHDRIVER_DECLARE(targbh, targbhdriver); 155 156 static void 157 targbhinit(void) 158 { 159 cam_status status; 160 161 /* 162 * Install a global async callback. This callback will 163 * receive async callbacks like "new path registered". 164 */ 165 status = xpt_register_async(AC_PATH_REGISTERED | AC_PATH_DEREGISTERED, 166 targbhasync, NULL, NULL); 167 168 if (status != CAM_REQ_CMP) { 169 printf("targbh: Failed to attach master async callback " 170 "due to status 0x%x!\n", status); 171 } 172 } 173 174 static void 175 targbhasync(void *callback_arg, u_int32_t code, 176 struct cam_path *path, void *arg) 177 { 178 struct cam_path *new_path; 179 struct ccb_pathinq *cpi; 180 path_id_t bus_path_id; 181 cam_status status; 182 183 cpi = (struct ccb_pathinq *)arg; 184 if (code == AC_PATH_REGISTERED) 185 bus_path_id = cpi->ccb_h.path_id; 186 else 187 bus_path_id = xpt_path_path_id(path); 188 /* 189 * Allocate a peripheral instance for 190 * this target instance. 191 */ 192 status = xpt_create_path(&new_path, NULL, 193 bus_path_id, 194 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD); 195 if (status != CAM_REQ_CMP) { 196 printf("targbhasync: Unable to create path " 197 "due to status 0x%x\n", status); 198 return; 199 } 200 201 switch (code) { 202 case AC_PATH_REGISTERED: 203 { 204 /* Only attach to controllers that support target mode */ 205 if ((cpi->target_sprt & PIT_PROCESSOR) == 0) 206 break; 207 208 status = cam_periph_alloc(targbhctor, NULL, targbhdtor, 209 targbhstart, 210 "targbh", CAM_PERIPH_BIO, 211 new_path, targbhasync, 212 AC_PATH_REGISTERED, 213 cpi); 214 break; 215 } 216 case AC_PATH_DEREGISTERED: 217 { 218 struct cam_periph *periph; 219 220 if ((periph = cam_periph_find(new_path, "targbh")) != NULL) 221 cam_periph_invalidate(periph); 222 break; 223 } 224 default: 225 break; 226 } 227 xpt_free_path(new_path); 228 } 229 230 /* Attempt to enable our lun */ 231 static cam_status 232 targbhenlun(struct cam_periph *periph) 233 { 234 union ccb immed_ccb; 235 struct targbh_softc *softc; 236 cam_status status; 237 int i; 238 239 softc = (struct targbh_softc *)periph->softc; 240 241 if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0) 242 return (CAM_REQ_CMP); 243 244 xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, CAM_PRIORITY_NORMAL); 245 immed_ccb.ccb_h.func_code = XPT_EN_LUN; 246 247 /* Don't need support for any vendor specific commands */ 248 immed_ccb.cel.grp6_len = 0; 249 immed_ccb.cel.grp7_len = 0; 250 immed_ccb.cel.enable = 1; 251 xpt_action(&immed_ccb); 252 status = immed_ccb.ccb_h.status; 253 if (status != CAM_REQ_CMP) { 254 xpt_print(periph->path, 255 "targbhenlun - Enable Lun Rejected with status 0x%x\n", 256 status); 257 return (status); 258 } 259 260 softc->flags |= TARGBH_FLAG_LUN_ENABLED; 261 262 /* 263 * Build up a buffer of accept target I/O 264 * operations for incoming selections. 265 */ 266 for (i = 0; i < MAX_ACCEPT; i++) { 267 struct ccb_accept_tio *atio; 268 269 atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_SCSIBH, 270 M_NOWAIT); 271 if (atio == NULL) { 272 status = CAM_RESRC_UNAVAIL; 273 break; 274 } 275 276 atio->ccb_h.ccb_descr = targbhallocdescr(); 277 278 if (atio->ccb_h.ccb_descr == NULL) { 279 free(atio, M_SCSIBH); 280 status = CAM_RESRC_UNAVAIL; 281 break; 282 } 283 284 xpt_setup_ccb(&atio->ccb_h, periph->path, CAM_PRIORITY_NORMAL); 285 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO; 286 atio->ccb_h.cbfcnp = targbhdone; 287 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link = 288 softc->accept_tio_list; 289 softc->accept_tio_list = atio; 290 xpt_action((union ccb *)atio); 291 status = atio->ccb_h.status; 292 if (status != CAM_REQ_INPROG) 293 break; 294 } 295 296 if (i == 0) { 297 xpt_print(periph->path, 298 "targbhenlun - Could not allocate accept tio CCBs: status " 299 "= 0x%x\n", status); 300 targbhdislun(periph); 301 return (CAM_REQ_CMP_ERR); 302 } 303 304 /* 305 * Build up a buffer of immediate notify CCBs 306 * so the SIM can tell us of asynchronous target mode events. 307 */ 308 for (i = 0; i < MAX_ACCEPT; i++) { 309 struct ccb_immediate_notify *inot; 310 311 inot = (struct ccb_immediate_notify*)malloc(sizeof(*inot), 312 M_SCSIBH, M_NOWAIT); 313 314 if (inot == NULL) { 315 status = CAM_RESRC_UNAVAIL; 316 break; 317 } 318 319 xpt_setup_ccb(&inot->ccb_h, periph->path, CAM_PRIORITY_NORMAL); 320 inot->ccb_h.func_code = XPT_IMMEDIATE_NOTIFY; 321 inot->ccb_h.cbfcnp = targbhdone; 322 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h, 323 periph_links.sle); 324 xpt_action((union ccb *)inot); 325 status = inot->ccb_h.status; 326 if (status != CAM_REQ_INPROG) 327 break; 328 } 329 330 if (i == 0) { 331 xpt_print(periph->path, 332 "targbhenlun - Could not allocate immediate notify " 333 "CCBs: status = 0x%x\n", status); 334 targbhdislun(periph); 335 return (CAM_REQ_CMP_ERR); 336 } 337 338 return (CAM_REQ_CMP); 339 } 340 341 static cam_status 342 targbhdislun(struct cam_periph *periph) 343 { 344 union ccb ccb; 345 struct targbh_softc *softc; 346 struct ccb_accept_tio* atio; 347 struct ccb_hdr *ccb_h; 348 349 softc = (struct targbh_softc *)periph->softc; 350 if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0) 351 return CAM_REQ_CMP; 352 353 /* XXX Block for Continue I/O completion */ 354 355 /* Kill off all ACCECPT and IMMEDIATE CCBs */ 356 while ((atio = softc->accept_tio_list) != NULL) { 357 358 softc->accept_tio_list = 359 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link; 360 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL); 361 ccb.cab.ccb_h.func_code = XPT_ABORT; 362 ccb.cab.abort_ccb = (union ccb *)atio; 363 xpt_action(&ccb); 364 } 365 366 while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) { 367 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle); 368 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, CAM_PRIORITY_NORMAL); 369 ccb.cab.ccb_h.func_code = XPT_ABORT; 370 ccb.cab.abort_ccb = (union ccb *)ccb_h; 371 xpt_action(&ccb); 372 } 373 374 /* 375 * Dissable this lun. 376 */ 377 xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, CAM_PRIORITY_NORMAL); 378 ccb.cel.ccb_h.func_code = XPT_EN_LUN; 379 ccb.cel.enable = 0; 380 xpt_action(&ccb); 381 382 if (ccb.cel.ccb_h.status != CAM_REQ_CMP) 383 printf("targbhdislun - Disabling lun on controller failed " 384 "with status 0x%x\n", ccb.cel.ccb_h.status); 385 else 386 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED; 387 return (ccb.cel.ccb_h.status); 388 } 389 390 static cam_status 391 targbhctor(struct cam_periph *periph, void *arg) 392 { 393 struct targbh_softc *softc; 394 395 /* Allocate our per-instance private storage */ 396 softc = (struct targbh_softc *)malloc(sizeof(*softc), 397 M_SCSIBH, M_NOWAIT); 398 if (softc == NULL) { 399 printf("targctor: unable to malloc softc\n"); 400 return (CAM_REQ_CMP_ERR); 401 } 402 403 bzero(softc, sizeof(*softc)); 404 TAILQ_INIT(&softc->pending_queue); 405 TAILQ_INIT(&softc->work_queue); 406 softc->accept_tio_list = NULL; 407 SLIST_INIT(&softc->immed_notify_slist); 408 softc->state = TARGBH_STATE_NORMAL; 409 periph->softc = softc; 410 softc->init_level++; 411 412 if (targbhenlun(periph) != CAM_REQ_CMP) 413 cam_periph_invalidate(periph); 414 return (CAM_REQ_CMP); 415 } 416 417 static void 418 targbhdtor(struct cam_periph *periph) 419 { 420 struct targbh_softc *softc; 421 422 softc = (struct targbh_softc *)periph->softc; 423 424 softc->state = TARGBH_STATE_TEARDOWN; 425 426 targbhdislun(periph); 427 428 switch (softc->init_level) { 429 case 0: 430 panic("targdtor - impossible init level"); 431 case 1: 432 /* FALLTHROUGH */ 433 default: 434 /* XXX Wait for callback of targbhdislun() */ 435 cam_periph_sleep(periph, softc, PRIBIO, "targbh", hz/2); 436 free(softc, M_SCSIBH); 437 break; 438 } 439 } 440 441 static void 442 targbhstart(struct cam_periph *periph, union ccb *start_ccb) 443 { 444 struct targbh_softc *softc; 445 struct ccb_hdr *ccbh; 446 struct ccb_accept_tio *atio; 447 struct targbh_cmd_desc *desc; 448 struct ccb_scsiio *csio; 449 ccb_flags flags; 450 451 softc = (struct targbh_softc *)periph->softc; 452 453 ccbh = TAILQ_FIRST(&softc->work_queue); 454 if (ccbh == NULL) { 455 xpt_release_ccb(start_ccb); 456 } else { 457 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe); 458 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh, 459 periph_links.tqe); 460 atio = (struct ccb_accept_tio*)ccbh; 461 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr; 462 463 /* Is this a tagged request? */ 464 flags = atio->ccb_h.flags & 465 (CAM_DIS_DISCONNECT|CAM_TAG_ACTION_VALID|CAM_DIR_MASK); 466 467 csio = &start_ccb->csio; 468 /* 469 * If we are done with the transaction, tell the 470 * controller to send status and perform a CMD_CMPLT. 471 * If we have associated sense data, see if we can 472 * send that too. 473 */ 474 if (desc->data_resid == desc->data_increment) { 475 flags |= CAM_SEND_STATUS; 476 if (atio->sense_len) { 477 csio->sense_len = atio->sense_len; 478 csio->sense_data = atio->sense_data; 479 flags |= CAM_SEND_SENSE; 480 } 481 482 } 483 484 cam_fill_ctio(csio, 485 /*retries*/2, 486 targbhdone, 487 flags, 488 (flags & CAM_TAG_ACTION_VALID)? 489 MSG_SIMPLE_Q_TAG : 0, 490 atio->tag_id, 491 atio->init_id, 492 desc->status, 493 /*data_ptr*/desc->data_increment == 0 494 ? NULL : desc->data, 495 /*dxfer_len*/desc->data_increment, 496 /*timeout*/desc->timeout); 497 498 /* Override our wildcard attachment */ 499 start_ccb->ccb_h.target_id = atio->ccb_h.target_id; 500 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun; 501 502 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ; 503 start_ccb->ccb_h.ccb_atio = atio; 504 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 505 ("Sending a CTIO\n")); 506 xpt_action(start_ccb); 507 /* 508 * If the queue was frozen waiting for the response 509 * to this ATIO (for instance disconnection was disallowed), 510 * then release it now that our response has been queued. 511 */ 512 if ((atio->ccb_h.status & CAM_DEV_QFRZN) != 0) { 513 cam_release_devq(periph->path, 514 /*relsim_flags*/0, 515 /*reduction*/0, 516 /*timeout*/0, 517 /*getcount_only*/0); 518 atio->ccb_h.status &= ~CAM_DEV_QFRZN; 519 } 520 ccbh = TAILQ_FIRST(&softc->work_queue); 521 } 522 if (ccbh != NULL) 523 xpt_schedule(periph, CAM_PRIORITY_NORMAL); 524 } 525 526 static void 527 targbhdone(struct cam_periph *periph, union ccb *done_ccb) 528 { 529 struct targbh_softc *softc; 530 531 softc = (struct targbh_softc *)periph->softc; 532 533 switch (done_ccb->ccb_h.func_code) { 534 case XPT_ACCEPT_TARGET_IO: 535 { 536 struct ccb_accept_tio *atio; 537 struct targbh_cmd_desc *descr; 538 u_int8_t *cdb; 539 int priority; 540 541 atio = &done_ccb->atio; 542 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr; 543 cdb = atio->cdb_io.cdb_bytes; 544 if (softc->state == TARGBH_STATE_TEARDOWN 545 || atio->ccb_h.status == CAM_REQ_ABORTED) { 546 targbhfreedescr(descr); 547 xpt_free_ccb(done_ccb); 548 return; 549 } 550 551 /* 552 * Determine the type of incoming command and 553 * setup our buffer for a response. 554 */ 555 switch (cdb[0]) { 556 case INQUIRY: 557 { 558 struct scsi_inquiry *inq; 559 560 inq = (struct scsi_inquiry *)cdb; 561 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 562 ("Saw an inquiry!\n")); 563 /* 564 * Validate the command. We don't 565 * support any VPD pages, so complain 566 * if EVPD is set. 567 */ 568 if ((inq->byte2 & SI_EVPD) != 0 569 || inq->page_code != 0) { 570 atio->ccb_h.flags &= ~CAM_DIR_MASK; 571 atio->ccb_h.flags |= CAM_DIR_NONE; 572 /* 573 * This needs to have other than a 574 * no_lun_sense_data response. 575 */ 576 bcopy(&no_lun_sense_data, &atio->sense_data, 577 min(sizeof(no_lun_sense_data), 578 sizeof(atio->sense_data))); 579 atio->sense_len = sizeof(no_lun_sense_data); 580 descr->data_resid = 0; 581 descr->data_increment = 0; 582 descr->status = SCSI_STATUS_CHECK_COND; 583 break; 584 } 585 /* 586 * Direction is always relative 587 * to the initator. 588 */ 589 atio->ccb_h.flags &= ~CAM_DIR_MASK; 590 atio->ccb_h.flags |= CAM_DIR_IN; 591 descr->data = &no_lun_inq_data; 592 descr->data_resid = MIN(sizeof(no_lun_inq_data), 593 scsi_2btoul(inq->length)); 594 descr->data_increment = descr->data_resid; 595 descr->timeout = 5 * 1000; 596 descr->status = SCSI_STATUS_OK; 597 break; 598 } 599 case REQUEST_SENSE: 600 { 601 struct scsi_request_sense *rsense; 602 603 rsense = (struct scsi_request_sense *)cdb; 604 /* Refer to static sense data */ 605 atio->ccb_h.flags &= ~CAM_DIR_MASK; 606 atio->ccb_h.flags |= CAM_DIR_IN; 607 descr->data = &no_lun_sense_data; 608 descr->data_resid = request_sense_size; 609 descr->data_resid = MIN(descr->data_resid, 610 SCSI_CDB6_LEN(rsense->length)); 611 descr->data_increment = descr->data_resid; 612 descr->timeout = 5 * 1000; 613 descr->status = SCSI_STATUS_OK; 614 break; 615 } 616 default: 617 /* Constant CA, tell initiator */ 618 /* Direction is always relative to the initator */ 619 atio->ccb_h.flags &= ~CAM_DIR_MASK; 620 atio->ccb_h.flags |= CAM_DIR_NONE; 621 bcopy(&no_lun_sense_data, &atio->sense_data, 622 min(sizeof(no_lun_sense_data), 623 sizeof(atio->sense_data))); 624 atio->sense_len = sizeof (no_lun_sense_data); 625 descr->data_resid = 0; 626 descr->data_increment = 0; 627 descr->timeout = 5 * 1000; 628 descr->status = SCSI_STATUS_CHECK_COND; 629 break; 630 } 631 632 /* Queue us up to receive a Continue Target I/O ccb. */ 633 if ((atio->ccb_h.flags & CAM_DIS_DISCONNECT) != 0) { 634 TAILQ_INSERT_HEAD(&softc->work_queue, &atio->ccb_h, 635 periph_links.tqe); 636 priority = 0; 637 } else { 638 TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h, 639 periph_links.tqe); 640 priority = CAM_PRIORITY_NORMAL; 641 } 642 xpt_schedule(periph, priority); 643 break; 644 } 645 case XPT_CONT_TARGET_IO: 646 { 647 struct ccb_accept_tio *atio; 648 struct targbh_cmd_desc *desc; 649 650 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 651 ("Received completed CTIO\n")); 652 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio; 653 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr; 654 655 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h, 656 periph_links.tqe); 657 658 /* 659 * We could check for CAM_SENT_SENSE bein set here, 660 * but since we're not maintaining any CA/UA state, 661 * there's no point. 662 */ 663 atio->sense_len = 0; 664 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE; 665 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE; 666 667 /* 668 * Any errors will not change the data we return, 669 * so make sure the queue is not left frozen. 670 * XXX - At some point there may be errors that 671 * leave us in a connected state with the 672 * initiator... 673 */ 674 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) { 675 printf("Releasing Queue\n"); 676 cam_release_devq(done_ccb->ccb_h.path, 677 /*relsim_flags*/0, 678 /*reduction*/0, 679 /*timeout*/0, 680 /*getcount_only*/0); 681 done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN; 682 } 683 desc->data_resid -= desc->data_increment; 684 xpt_release_ccb(done_ccb); 685 if (softc->state != TARGBH_STATE_TEARDOWN) { 686 687 /* 688 * Send the original accept TIO back to the 689 * controller to handle more work. 690 */ 691 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 692 ("Returning ATIO to target\n")); 693 /* Restore wildcards */ 694 atio->ccb_h.target_id = CAM_TARGET_WILDCARD; 695 atio->ccb_h.target_lun = CAM_LUN_WILDCARD; 696 xpt_action((union ccb *)atio); 697 break; 698 } else { 699 targbhfreedescr(desc); 700 free(atio, M_SCSIBH); 701 } 702 break; 703 } 704 case XPT_IMMEDIATE_NOTIFY: 705 { 706 int frozen; 707 708 frozen = (done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0; 709 if (softc->state == TARGBH_STATE_TEARDOWN 710 || done_ccb->ccb_h.status == CAM_REQ_ABORTED) { 711 printf("Freed an immediate notify\n"); 712 xpt_free_ccb(done_ccb); 713 } else { 714 /* Requeue for another immediate event */ 715 xpt_action(done_ccb); 716 } 717 if (frozen != 0) 718 cam_release_devq(periph->path, 719 /*relsim_flags*/0, 720 /*opening reduction*/0, 721 /*timeout*/0, 722 /*getcount_only*/0); 723 break; 724 } 725 default: 726 panic("targbhdone: Unexpected ccb opcode"); 727 break; 728 } 729 } 730 731 #ifdef NOTYET 732 static int 733 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags) 734 { 735 return 0; 736 } 737 #endif 738 739 static struct targbh_cmd_desc* 740 targbhallocdescr() 741 { 742 struct targbh_cmd_desc* descr; 743 744 /* Allocate the targbh_descr structure */ 745 descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr), 746 M_SCSIBH, M_NOWAIT); 747 if (descr == NULL) 748 return (NULL); 749 750 bzero(descr, sizeof(*descr)); 751 752 /* Allocate buffer backing store */ 753 descr->backing_store = malloc(MAX_BUF_SIZE, M_SCSIBH, M_NOWAIT); 754 if (descr->backing_store == NULL) { 755 free(descr, M_SCSIBH); 756 return (NULL); 757 } 758 descr->max_size = MAX_BUF_SIZE; 759 return (descr); 760 } 761 762 static void 763 targbhfreedescr(struct targbh_cmd_desc *descr) 764 { 765 free(descr->backing_store, M_SCSIBH); 766 free(descr, M_SCSIBH); 767 }
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