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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 * 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 29 #include <sys/cdefs.h> 30 __FBSDID("$FreeBSD: releng/6.2/sys/cam/scsi/scsi_targ_bh.c 147723 2005-07-01 15:21:30Z avatar $"); 31 32 #include <sys/param.h> 33 #include <sys/queue.h> 34 #include <sys/systm.h> 35 #include <sys/kernel.h> 36 #include <sys/types.h> 37 #include <sys/bio.h> 38 #include <sys/conf.h> 39 #include <sys/devicestat.h> 40 #include <sys/malloc.h> 41 #include <sys/uio.h> 42 43 #include <cam/cam.h> 44 #include <cam/cam_ccb.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 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*/ 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 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 | AC_PATH_DEREGISTERED; 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_path *new_path; 191 struct ccb_pathinq *cpi; 192 path_id_t bus_path_id; 193 cam_status status; 194 195 cpi = (struct ccb_pathinq *)arg; 196 if (code == AC_PATH_REGISTERED) 197 bus_path_id = cpi->ccb_h.path_id; 198 else 199 bus_path_id = xpt_path_path_id(path); 200 /* 201 * Allocate a peripheral instance for 202 * this target instance. 203 */ 204 status = xpt_create_path(&new_path, NULL, 205 bus_path_id, 206 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD); 207 if (status != CAM_REQ_CMP) { 208 printf("targbhasync: Unable to create path " 209 "due to status 0x%x\n", status); 210 return; 211 } 212 213 switch (code) { 214 case AC_PATH_REGISTERED: 215 { 216 /* Only attach to controllers that support target mode */ 217 if ((cpi->target_sprt & PIT_PROCESSOR) == 0) 218 break; 219 220 status = cam_periph_alloc(targbhctor, NULL, targbhdtor, 221 targbhstart, 222 "targbh", CAM_PERIPH_BIO, 223 new_path, targbhasync, 224 AC_PATH_REGISTERED, 225 cpi); 226 break; 227 } 228 case AC_PATH_DEREGISTERED: 229 { 230 struct cam_periph *periph; 231 232 if ((periph = cam_periph_find(new_path, "targbh")) != NULL) 233 cam_periph_invalidate(periph); 234 break; 235 } 236 default: 237 break; 238 } 239 xpt_free_path(new_path); 240 } 241 242 /* Attempt to enable our lun */ 243 static cam_status 244 targbhenlun(struct cam_periph *periph) 245 { 246 union ccb immed_ccb; 247 struct targbh_softc *softc; 248 cam_status status; 249 int i; 250 251 softc = (struct targbh_softc *)periph->softc; 252 253 if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0) 254 return (CAM_REQ_CMP); 255 256 xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, /*priority*/1); 257 immed_ccb.ccb_h.func_code = XPT_EN_LUN; 258 259 /* Don't need support for any vendor specific commands */ 260 immed_ccb.cel.grp6_len = 0; 261 immed_ccb.cel.grp7_len = 0; 262 immed_ccb.cel.enable = 1; 263 xpt_action(&immed_ccb); 264 status = immed_ccb.ccb_h.status; 265 if (status != CAM_REQ_CMP) { 266 xpt_print_path(periph->path); 267 printf("targbhenlun - Enable Lun Rejected with status 0x%x\n", 268 status); 269 return (status); 270 } 271 272 softc->flags |= TARGBH_FLAG_LUN_ENABLED; 273 274 /* 275 * Build up a buffer of accept target I/O 276 * operations for incoming selections. 277 */ 278 for (i = 0; i < MAX_ACCEPT; i++) { 279 struct ccb_accept_tio *atio; 280 281 atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_SCSIBH, 282 M_NOWAIT); 283 if (atio == NULL) { 284 status = CAM_RESRC_UNAVAIL; 285 break; 286 } 287 288 atio->ccb_h.ccb_descr = targbhallocdescr(); 289 290 if (atio->ccb_h.ccb_descr == NULL) { 291 free(atio, M_SCSIBH); 292 status = CAM_RESRC_UNAVAIL; 293 break; 294 } 295 296 xpt_setup_ccb(&atio->ccb_h, periph->path, /*priority*/1); 297 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO; 298 atio->ccb_h.cbfcnp = targbhdone; 299 xpt_action((union ccb *)atio); 300 status = atio->ccb_h.status; 301 if (status != CAM_REQ_INPROG) { 302 targbhfreedescr(atio->ccb_h.ccb_descr); 303 free(atio, M_SCSIBH); 304 break; 305 } 306 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link = 307 softc->accept_tio_list; 308 softc->accept_tio_list = atio; 309 } 310 311 if (i == 0) { 312 xpt_print_path(periph->path); 313 printf("targbhenlun - Could not allocate accept tio CCBs: " 314 "status = 0x%x\n", status); 315 targbhdislun(periph); 316 return (CAM_REQ_CMP_ERR); 317 } 318 319 /* 320 * Build up a buffer of immediate notify CCBs 321 * so the SIM can tell us of asynchronous target mode events. 322 */ 323 for (i = 0; i < MAX_ACCEPT; i++) { 324 struct ccb_immed_notify *inot; 325 326 inot = (struct ccb_immed_notify*)malloc(sizeof(*inot), M_SCSIBH, 327 M_NOWAIT); 328 329 if (inot == NULL) { 330 status = CAM_RESRC_UNAVAIL; 331 break; 332 } 333 334 xpt_setup_ccb(&inot->ccb_h, periph->path, /*priority*/1); 335 inot->ccb_h.func_code = XPT_IMMED_NOTIFY; 336 inot->ccb_h.cbfcnp = targbhdone; 337 xpt_action((union ccb *)inot); 338 status = inot->ccb_h.status; 339 if (status != CAM_REQ_INPROG) { 340 free(inot, M_SCSIBH); 341 break; 342 } 343 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h, 344 periph_links.sle); 345 } 346 347 if (i == 0) { 348 xpt_print_path(periph->path); 349 printf("targbhenlun - Could not allocate immediate notify " 350 "CCBs: status = 0x%x\n", status); 351 targbhdislun(periph); 352 return (CAM_REQ_CMP_ERR); 353 } 354 355 return (CAM_REQ_CMP); 356 } 357 358 static cam_status 359 targbhdislun(struct cam_periph *periph) 360 { 361 union ccb ccb; 362 struct targbh_softc *softc; 363 struct ccb_accept_tio* atio; 364 struct ccb_hdr *ccb_h; 365 366 softc = (struct targbh_softc *)periph->softc; 367 if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0) 368 return CAM_REQ_CMP; 369 370 /* XXX Block for Continue I/O completion */ 371 372 /* Kill off all ACCECPT and IMMEDIATE CCBs */ 373 while ((atio = softc->accept_tio_list) != NULL) { 374 375 softc->accept_tio_list = 376 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link; 377 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1); 378 ccb.cab.ccb_h.func_code = XPT_ABORT; 379 ccb.cab.abort_ccb = (union ccb *)atio; 380 xpt_action(&ccb); 381 } 382 383 while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) { 384 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle); 385 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1); 386 ccb.cab.ccb_h.func_code = XPT_ABORT; 387 ccb.cab.abort_ccb = (union ccb *)ccb_h; 388 xpt_action(&ccb); 389 } 390 391 /* 392 * Dissable this lun. 393 */ 394 xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, /*priority*/1); 395 ccb.cel.ccb_h.func_code = XPT_EN_LUN; 396 ccb.cel.enable = 0; 397 xpt_action(&ccb); 398 399 if (ccb.cel.ccb_h.status != CAM_REQ_CMP) 400 printf("targbhdislun - Disabling lun on controller failed " 401 "with status 0x%x\n", ccb.cel.ccb_h.status); 402 else 403 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED; 404 return (ccb.cel.ccb_h.status); 405 } 406 407 static cam_status 408 targbhctor(struct cam_periph *periph, void *arg) 409 { 410 struct targbh_softc *softc; 411 412 /* Allocate our per-instance private storage */ 413 softc = (struct targbh_softc *)malloc(sizeof(*softc), 414 M_SCSIBH, M_NOWAIT); 415 if (softc == NULL) { 416 printf("targctor: unable to malloc softc\n"); 417 return (CAM_REQ_CMP_ERR); 418 } 419 420 bzero(softc, sizeof(*softc)); 421 TAILQ_INIT(&softc->pending_queue); 422 TAILQ_INIT(&softc->work_queue); 423 softc->accept_tio_list = NULL; 424 SLIST_INIT(&softc->immed_notify_slist); 425 softc->state = TARGBH_STATE_NORMAL; 426 periph->softc = softc; 427 softc->init_level++; 428 429 return (targbhenlun(periph)); 430 } 431 432 static void 433 targbhdtor(struct cam_periph *periph) 434 { 435 struct targbh_softc *softc; 436 437 softc = (struct targbh_softc *)periph->softc; 438 439 softc->state = TARGBH_STATE_TEARDOWN; 440 441 targbhdislun(periph); 442 443 switch (softc->init_level) { 444 case 0: 445 panic("targdtor - impossible init level");; 446 case 1: 447 /* FALLTHROUGH */ 448 default: 449 /* XXX Wait for callback of targbhdislun() */ 450 tsleep(softc, PRIBIO, "targbh", hz/2); 451 free(softc, M_SCSIBH); 452 break; 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 & 491 (CAM_DIS_DISCONNECT|CAM_TAG_ACTION_VALID|CAM_DIR_MASK); 492 493 csio = &start_ccb->csio; 494 /* 495 * If we are done with the transaction, tell the 496 * controller to send status and perform a CMD_CMPLT. 497 * If we have associated sense data, see if we can 498 * send that too. 499 */ 500 if (desc->data_resid == desc->data_increment) { 501 flags |= CAM_SEND_STATUS; 502 if (atio->sense_len) { 503 csio->sense_len = atio->sense_len; 504 csio->sense_data = atio->sense_data; 505 flags |= CAM_SEND_SENSE; 506 } 507 508 } 509 510 cam_fill_ctio(csio, 511 /*retries*/2, 512 targbhdone, 513 flags, 514 (flags & CAM_TAG_ACTION_VALID)? 515 MSG_SIMPLE_Q_TAG : 0, 516 atio->tag_id, 517 atio->init_id, 518 desc->status, 519 /*data_ptr*/desc->data_increment == 0 520 ? NULL : desc->data, 521 /*dxfer_len*/desc->data_increment, 522 /*timeout*/desc->timeout); 523 524 /* Override our wildcard attachment */ 525 start_ccb->ccb_h.target_id = atio->ccb_h.target_id; 526 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun; 527 528 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ; 529 start_ccb->ccb_h.ccb_atio = atio; 530 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 531 ("Sending a CTIO\n")); 532 xpt_action(start_ccb); 533 /* 534 * If the queue was frozen waiting for the response 535 * to this ATIO (for instance disconnection was disallowed), 536 * then release it now that our response has been queued. 537 */ 538 if ((atio->ccb_h.status & CAM_DEV_QFRZN) != 0) { 539 cam_release_devq(periph->path, 540 /*relsim_flags*/0, 541 /*reduction*/0, 542 /*timeout*/0, 543 /*getcount_only*/0); 544 atio->ccb_h.status &= ~CAM_DEV_QFRZN; 545 } 546 s = splbio(); 547 ccbh = TAILQ_FIRST(&softc->work_queue); 548 splx(s); 549 } 550 if (ccbh != NULL) 551 xpt_schedule(periph, /*priority*/1); 552 } 553 554 static void 555 targbhdone(struct cam_periph *periph, union ccb *done_ccb) 556 { 557 struct targbh_softc *softc; 558 559 softc = (struct targbh_softc *)periph->softc; 560 561 if (done_ccb->ccb_h.ccb_type == TARGBH_CCB_WAITING) { 562 /* Caller will release the CCB */ 563 wakeup(&done_ccb->ccb_h.cbfcnp); 564 return; 565 } 566 567 switch (done_ccb->ccb_h.func_code) { 568 case XPT_ACCEPT_TARGET_IO: 569 { 570 struct ccb_accept_tio *atio; 571 struct targbh_cmd_desc *descr; 572 u_int8_t *cdb; 573 int priority; 574 575 atio = &done_ccb->atio; 576 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr; 577 cdb = atio->cdb_io.cdb_bytes; 578 if (softc->state == TARGBH_STATE_TEARDOWN 579 || atio->ccb_h.status == CAM_REQ_ABORTED) { 580 targbhfreedescr(descr); 581 xpt_free_ccb(done_ccb); 582 return; 583 } 584 585 /* 586 * Determine the type of incoming command and 587 * setup our buffer for a response. 588 */ 589 switch (cdb[0]) { 590 case INQUIRY: 591 { 592 struct scsi_inquiry *inq; 593 594 inq = (struct scsi_inquiry *)cdb; 595 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 596 ("Saw an inquiry!\n")); 597 /* 598 * Validate the command. We don't 599 * support any VPD pages, so complain 600 * if EVPD is set. 601 */ 602 if ((inq->byte2 & SI_EVPD) != 0 603 || inq->page_code != 0) { 604 atio->ccb_h.flags &= ~CAM_DIR_MASK; 605 atio->ccb_h.flags |= CAM_DIR_NONE; 606 /* 607 * This needs to have other than a 608 * no_lun_sense_data response. 609 */ 610 atio->sense_data = no_lun_sense_data; 611 atio->sense_len = sizeof(no_lun_sense_data); 612 descr->data_resid = 0; 613 descr->data_increment = 0; 614 descr->status = SCSI_STATUS_CHECK_COND; 615 break; 616 } 617 /* 618 * Direction is always relative 619 * to the initator. 620 */ 621 atio->ccb_h.flags &= ~CAM_DIR_MASK; 622 atio->ccb_h.flags |= CAM_DIR_IN; 623 descr->data = &no_lun_inq_data; 624 descr->data_resid = MIN(sizeof(no_lun_inq_data), 625 SCSI_CDB6_LEN(inq->length)); 626 descr->data_increment = descr->data_resid; 627 descr->timeout = 5 * 1000; 628 descr->status = SCSI_STATUS_OK; 629 break; 630 } 631 case REQUEST_SENSE: 632 { 633 struct scsi_request_sense *rsense; 634 635 rsense = (struct scsi_request_sense *)cdb; 636 /* Refer to static sense data */ 637 atio->ccb_h.flags &= ~CAM_DIR_MASK; 638 atio->ccb_h.flags |= CAM_DIR_IN; 639 descr->data = &no_lun_sense_data; 640 descr->data_resid = request_sense_size; 641 descr->data_resid = MIN(descr->data_resid, 642 SCSI_CDB6_LEN(rsense->length)); 643 descr->data_increment = descr->data_resid; 644 descr->timeout = 5 * 1000; 645 descr->status = SCSI_STATUS_OK; 646 break; 647 } 648 default: 649 /* Constant CA, tell initiator */ 650 /* Direction is always relative to the initator */ 651 atio->ccb_h.flags &= ~CAM_DIR_MASK; 652 atio->ccb_h.flags |= CAM_DIR_NONE; 653 atio->sense_data = no_lun_sense_data; 654 atio->sense_len = sizeof (no_lun_sense_data); 655 descr->data_resid = 0; 656 descr->data_increment = 0; 657 descr->timeout = 5 * 1000; 658 descr->status = SCSI_STATUS_CHECK_COND; 659 break; 660 } 661 662 /* Queue us up to receive a Continue Target I/O ccb. */ 663 if ((atio->ccb_h.flags & CAM_DIS_DISCONNECT) != 0) { 664 TAILQ_INSERT_HEAD(&softc->work_queue, &atio->ccb_h, 665 periph_links.tqe); 666 priority = 0; 667 } else { 668 TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h, 669 periph_links.tqe); 670 priority = 1; 671 } 672 xpt_schedule(periph, priority); 673 break; 674 } 675 case XPT_CONT_TARGET_IO: 676 { 677 struct ccb_accept_tio *atio; 678 struct targbh_cmd_desc *desc; 679 680 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 681 ("Received completed CTIO\n")); 682 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio; 683 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr; 684 685 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h, 686 periph_links.tqe); 687 688 /* 689 * We could check for CAM_SENT_SENSE bein set here, 690 * but since we're not maintaining any CA/UA state, 691 * there's no point. 692 */ 693 atio->sense_len = 0; 694 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE; 695 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE; 696 697 /* 698 * Any errors will not change the data we return, 699 * so make sure the queue is not left frozen. 700 * XXX - At some point there may be errors that 701 * leave us in a connected state with the 702 * initiator... 703 */ 704 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) { 705 printf("Releasing Queue\n"); 706 cam_release_devq(done_ccb->ccb_h.path, 707 /*relsim_flags*/0, 708 /*reduction*/0, 709 /*timeout*/0, 710 /*getcount_only*/0); 711 done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN; 712 } 713 desc->data_resid -= desc->data_increment; 714 xpt_release_ccb(done_ccb); 715 if (softc->state != TARGBH_STATE_TEARDOWN) { 716 717 /* 718 * Send the original accept TIO back to the 719 * controller to handle more work. 720 */ 721 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 722 ("Returning ATIO to target\n")); 723 /* Restore wildcards */ 724 atio->ccb_h.target_id = CAM_TARGET_WILDCARD; 725 atio->ccb_h.target_lun = CAM_LUN_WILDCARD; 726 xpt_action((union ccb *)atio); 727 break; 728 } else { 729 targbhfreedescr(desc); 730 free(atio, M_SCSIBH); 731 } 732 break; 733 } 734 case XPT_IMMED_NOTIFY: 735 { 736 int frozen; 737 738 frozen = (done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0; 739 if (softc->state == TARGBH_STATE_TEARDOWN 740 || done_ccb->ccb_h.status == CAM_REQ_ABORTED) { 741 printf("Freed an immediate notify\n"); 742 xpt_free_ccb(done_ccb); 743 } else { 744 /* Requeue for another immediate event */ 745 xpt_action(done_ccb); 746 } 747 if (frozen != 0) 748 cam_release_devq(periph->path, 749 /*relsim_flags*/0, 750 /*opening reduction*/0, 751 /*timeout*/0, 752 /*getcount_only*/0); 753 break; 754 } 755 default: 756 panic("targbhdone: Unexpected ccb opcode"); 757 break; 758 } 759 } 760 761 #ifdef NOTYET 762 static int 763 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags) 764 { 765 return 0; 766 } 767 #endif 768 769 static struct targbh_cmd_desc* 770 targbhallocdescr() 771 { 772 struct targbh_cmd_desc* descr; 773 774 /* Allocate the targbh_descr structure */ 775 descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr), 776 M_SCSIBH, M_NOWAIT); 777 if (descr == NULL) 778 return (NULL); 779 780 bzero(descr, sizeof(*descr)); 781 782 /* Allocate buffer backing store */ 783 descr->backing_store = malloc(MAX_BUF_SIZE, M_SCSIBH, M_NOWAIT); 784 if (descr->backing_store == NULL) { 785 free(descr, M_SCSIBH); 786 return (NULL); 787 } 788 descr->max_size = MAX_BUF_SIZE; 789 return (descr); 790 } 791 792 static void 793 targbhfreedescr(struct targbh_cmd_desc *descr) 794 { 795 free(descr->backing_store, M_SCSIBH); 796 free(descr, M_SCSIBH); 797 }
Cache object: b011ce33a8ae9691fe33412fab4c619e
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