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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/5.2/sys/cam/scsi/scsi_targ_bh.c 120601 2003-09-30 08:03:52Z simokawa $"); 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 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*/ 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 PERIPHDRIVER_DECLARE(targbh, 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 = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_DEVBUF, 280 M_NOWAIT); 281 if (atio == NULL) { 282 status = CAM_RESRC_UNAVAIL; 283 break; 284 } 285 286 atio->ccb_h.ccb_descr = targbhallocdescr(); 287 288 if (atio->ccb_h.ccb_descr == NULL) { 289 free(atio, M_DEVBUF); 290 status = CAM_RESRC_UNAVAIL; 291 break; 292 } 293 294 xpt_setup_ccb(&atio->ccb_h, periph->path, /*priority*/1); 295 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO; 296 atio->ccb_h.cbfcnp = targbhdone; 297 xpt_action((union ccb *)atio); 298 status = atio->ccb_h.status; 299 if (status != CAM_REQ_INPROG) { 300 targbhfreedescr(atio->ccb_h.ccb_descr); 301 free(atio, M_DEVBUF); 302 break; 303 } 304 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link = 305 softc->accept_tio_list; 306 softc->accept_tio_list = atio; 307 } 308 309 if (i == 0) { 310 xpt_print_path(periph->path); 311 printf("targbhenlun - Could not allocate accept tio CCBs: " 312 "status = 0x%x\n", status); 313 targbhdislun(periph); 314 return (CAM_REQ_CMP_ERR); 315 } 316 317 /* 318 * Build up a buffer of immediate notify CCBs 319 * so the SIM can tell us of asynchronous target mode events. 320 */ 321 for (i = 0; i < MAX_ACCEPT; i++) { 322 struct ccb_immed_notify *inot; 323 324 inot = (struct ccb_immed_notify*)malloc(sizeof(*inot), M_DEVBUF, 325 M_NOWAIT); 326 327 if (inot == NULL) { 328 status = CAM_RESRC_UNAVAIL; 329 break; 330 } 331 332 xpt_setup_ccb(&inot->ccb_h, periph->path, /*priority*/1); 333 inot->ccb_h.func_code = XPT_IMMED_NOTIFY; 334 inot->ccb_h.cbfcnp = targbhdone; 335 xpt_action((union ccb *)inot); 336 status = inot->ccb_h.status; 337 if (status != CAM_REQ_INPROG) { 338 free(inot, M_DEVBUF); 339 break; 340 } 341 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h, 342 periph_links.sle); 343 } 344 345 if (i == 0) { 346 xpt_print_path(periph->path); 347 printf("targbhenlun - Could not allocate immediate notify " 348 "CCBs: status = 0x%x\n", status); 349 targbhdislun(periph); 350 return (CAM_REQ_CMP_ERR); 351 } 352 353 return (CAM_REQ_CMP); 354 } 355 356 static cam_status 357 targbhdislun(struct cam_periph *periph) 358 { 359 union ccb ccb; 360 struct targbh_softc *softc; 361 struct ccb_accept_tio* atio; 362 struct ccb_hdr *ccb_h; 363 364 softc = (struct targbh_softc *)periph->softc; 365 if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0) 366 return CAM_REQ_CMP; 367 368 /* XXX Block for Continue I/O completion */ 369 370 /* Kill off all ACCECPT and IMMEDIATE CCBs */ 371 while ((atio = softc->accept_tio_list) != NULL) { 372 373 softc->accept_tio_list = 374 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link; 375 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1); 376 ccb.cab.ccb_h.func_code = XPT_ABORT; 377 ccb.cab.abort_ccb = (union ccb *)atio; 378 xpt_action(&ccb); 379 } 380 381 while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) { 382 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle); 383 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1); 384 ccb.cab.ccb_h.func_code = XPT_ABORT; 385 ccb.cab.abort_ccb = (union ccb *)ccb_h; 386 xpt_action(&ccb); 387 } 388 389 /* 390 * Dissable this lun. 391 */ 392 xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, /*priority*/1); 393 ccb.cel.ccb_h.func_code = XPT_EN_LUN; 394 ccb.cel.enable = 0; 395 xpt_action(&ccb); 396 397 if (ccb.cel.ccb_h.status != CAM_REQ_CMP) 398 printf("targbhdislun - Disabling lun on controller failed " 399 "with status 0x%x\n", ccb.cel.ccb_h.status); 400 else 401 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED; 402 return (ccb.cel.ccb_h.status); 403 } 404 405 static cam_status 406 targbhctor(struct cam_periph *periph, void *arg) 407 { 408 struct targbh_softc *softc; 409 410 /* Allocate our per-instance private storage */ 411 softc = (struct targbh_softc *)malloc(sizeof(*softc), 412 M_DEVBUF, M_NOWAIT); 413 if (softc == NULL) { 414 printf("targctor: unable to malloc softc\n"); 415 return (CAM_REQ_CMP_ERR); 416 } 417 418 bzero(softc, sizeof(*softc)); 419 TAILQ_INIT(&softc->pending_queue); 420 TAILQ_INIT(&softc->work_queue); 421 softc->accept_tio_list = NULL; 422 SLIST_INIT(&softc->immed_notify_slist); 423 softc->state = TARGBH_STATE_NORMAL; 424 periph->softc = softc; 425 softc->init_level++; 426 427 return (targbhenlun(periph)); 428 } 429 430 static void 431 targbhdtor(struct cam_periph *periph) 432 { 433 struct targbh_softc *softc; 434 435 softc = (struct targbh_softc *)periph->softc; 436 437 softc->state = TARGBH_STATE_TEARDOWN; 438 439 targbhdislun(periph); 440 441 switch (softc->init_level) { 442 case 0: 443 panic("targdtor - impossible init level");; 444 case 1: 445 /* FALLTHROUGH */ 446 default: 447 /* XXX Wait for callback of targbhdislun() */ 448 tsleep(softc, PRIBIO, "targbh", hz/2); 449 free(softc, M_DEVBUF); 450 break; 451 } 452 } 453 454 static void 455 targbhstart(struct cam_periph *periph, union ccb *start_ccb) 456 { 457 struct targbh_softc *softc; 458 struct ccb_hdr *ccbh; 459 struct ccb_accept_tio *atio; 460 struct targbh_cmd_desc *desc; 461 struct ccb_scsiio *csio; 462 ccb_flags flags; 463 int s; 464 465 softc = (struct targbh_softc *)periph->softc; 466 467 s = splbio(); 468 ccbh = TAILQ_FIRST(&softc->work_queue); 469 if (periph->immediate_priority <= periph->pinfo.priority) { 470 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WAITING; 471 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h, 472 periph_links.sle); 473 periph->immediate_priority = CAM_PRIORITY_NONE; 474 splx(s); 475 wakeup(&periph->ccb_list); 476 } else if (ccbh == NULL) { 477 splx(s); 478 xpt_release_ccb(start_ccb); 479 } else { 480 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe); 481 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh, 482 periph_links.tqe); 483 splx(s); 484 atio = (struct ccb_accept_tio*)ccbh; 485 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr; 486 487 /* Is this a tagged request? */ 488 flags = atio->ccb_h.flags & 489 (CAM_DIS_DISCONNECT|CAM_TAG_ACTION_VALID|CAM_DIR_MASK); 490 491 csio = &start_ccb->csio; 492 /* 493 * If we are done with the transaction, tell the 494 * controller to send status and perform a CMD_CMPLT. 495 * If we have associated sense data, see if we can 496 * send that too. 497 */ 498 if (desc->data_resid == desc->data_increment) { 499 flags |= CAM_SEND_STATUS; 500 if (atio->sense_len) { 501 csio->sense_len = atio->sense_len; 502 csio->sense_data = atio->sense_data; 503 flags |= CAM_SEND_SENSE; 504 } 505 506 } 507 508 cam_fill_ctio(csio, 509 /*retries*/2, 510 targbhdone, 511 flags, 512 (flags & CAM_TAG_ACTION_VALID)? 513 MSG_SIMPLE_Q_TAG : 0, 514 atio->tag_id, 515 atio->init_id, 516 desc->status, 517 /*data_ptr*/desc->data_increment == 0 518 ? NULL : desc->data, 519 /*dxfer_len*/desc->data_increment, 520 /*timeout*/desc->timeout); 521 522 /* Override our wildcard attachment */ 523 start_ccb->ccb_h.target_id = atio->ccb_h.target_id; 524 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun; 525 526 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ; 527 start_ccb->ccb_h.ccb_atio = atio; 528 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 529 ("Sending a CTIO\n")); 530 xpt_action(start_ccb); 531 /* 532 * If the queue was frozen waiting for the response 533 * to this ATIO (for instance disconnection was disallowed), 534 * then release it now that our response has been queued. 535 */ 536 if ((atio->ccb_h.status & CAM_DEV_QFRZN) != 0) { 537 cam_release_devq(periph->path, 538 /*relsim_flags*/0, 539 /*reduction*/0, 540 /*timeout*/0, 541 /*getcount_only*/0); 542 atio->ccb_h.status &= ~CAM_DEV_QFRZN; 543 } 544 s = splbio(); 545 ccbh = TAILQ_FIRST(&softc->work_queue); 546 splx(s); 547 } 548 if (ccbh != NULL) 549 xpt_schedule(periph, /*priority*/1); 550 } 551 552 static void 553 targbhdone(struct cam_periph *periph, union ccb *done_ccb) 554 { 555 struct targbh_softc *softc; 556 557 softc = (struct targbh_softc *)periph->softc; 558 559 if (done_ccb->ccb_h.ccb_type == TARGBH_CCB_WAITING) { 560 /* Caller will release the CCB */ 561 wakeup(&done_ccb->ccb_h.cbfcnp); 562 return; 563 } 564 565 switch (done_ccb->ccb_h.func_code) { 566 case XPT_ACCEPT_TARGET_IO: 567 { 568 struct ccb_accept_tio *atio; 569 struct targbh_cmd_desc *descr; 570 u_int8_t *cdb; 571 int priority; 572 573 atio = &done_ccb->atio; 574 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr; 575 cdb = atio->cdb_io.cdb_bytes; 576 if (softc->state == TARGBH_STATE_TEARDOWN 577 || atio->ccb_h.status == CAM_REQ_ABORTED) { 578 targbhfreedescr(descr); 579 free(done_ccb, M_DEVBUF); 580 return; 581 } 582 583 /* 584 * Determine the type of incoming command and 585 * setup our buffer for a response. 586 */ 587 switch (cdb[0]) { 588 case INQUIRY: 589 { 590 struct scsi_inquiry *inq; 591 592 inq = (struct scsi_inquiry *)cdb; 593 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 594 ("Saw an inquiry!\n")); 595 /* 596 * Validate the command. We don't 597 * support any VPD pages, so complain 598 * if EVPD is set. 599 */ 600 if ((inq->byte2 & SI_EVPD) != 0 601 || inq->page_code != 0) { 602 atio->ccb_h.flags &= ~CAM_DIR_MASK; 603 atio->ccb_h.flags |= CAM_DIR_NONE; 604 /* 605 * This needs to have other than a 606 * no_lun_sense_data response. 607 */ 608 atio->sense_data = no_lun_sense_data; 609 atio->sense_len = sizeof(no_lun_sense_data); 610 descr->data_resid = 0; 611 descr->data_increment = 0; 612 descr->status = SCSI_STATUS_CHECK_COND; 613 break; 614 } 615 /* 616 * Direction is always relative 617 * to the initator. 618 */ 619 atio->ccb_h.flags &= ~CAM_DIR_MASK; 620 atio->ccb_h.flags |= CAM_DIR_IN; 621 descr->data = &no_lun_inq_data; 622 descr->data_resid = MIN(sizeof(no_lun_inq_data), 623 SCSI_CDB6_LEN(inq->length)); 624 descr->data_increment = descr->data_resid; 625 descr->timeout = 5 * 1000; 626 descr->status = SCSI_STATUS_OK; 627 break; 628 } 629 case REQUEST_SENSE: 630 { 631 struct scsi_request_sense *rsense; 632 633 rsense = (struct scsi_request_sense *)cdb; 634 /* Refer to static sense data */ 635 atio->ccb_h.flags &= ~CAM_DIR_MASK; 636 atio->ccb_h.flags |= CAM_DIR_IN; 637 descr->data = &no_lun_sense_data; 638 descr->data_resid = request_sense_size; 639 descr->data_resid = MIN(descr->data_resid, 640 SCSI_CDB6_LEN(rsense->length)); 641 descr->data_increment = descr->data_resid; 642 descr->timeout = 5 * 1000; 643 descr->status = SCSI_STATUS_OK; 644 break; 645 } 646 default: 647 /* Constant CA, tell initiator */ 648 /* Direction is always relative to the initator */ 649 atio->ccb_h.flags &= ~CAM_DIR_MASK; 650 atio->ccb_h.flags |= CAM_DIR_NONE; 651 atio->sense_data = no_lun_sense_data; 652 atio->sense_len = sizeof (no_lun_sense_data); 653 descr->data_resid = 0; 654 descr->data_increment = 0; 655 descr->timeout = 5 * 1000; 656 descr->status = SCSI_STATUS_CHECK_COND; 657 break; 658 } 659 660 /* Queue us up to receive a Continue Target I/O ccb. */ 661 if ((atio->ccb_h.flags & CAM_DIS_DISCONNECT) != 0) { 662 TAILQ_INSERT_HEAD(&softc->work_queue, &atio->ccb_h, 663 periph_links.tqe); 664 priority = 0; 665 } else { 666 TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h, 667 periph_links.tqe); 668 priority = 1; 669 } 670 xpt_schedule(periph, priority); 671 break; 672 } 673 case XPT_CONT_TARGET_IO: 674 { 675 struct ccb_accept_tio *atio; 676 struct targbh_cmd_desc *desc; 677 678 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 679 ("Received completed CTIO\n")); 680 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio; 681 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr; 682 683 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h, 684 periph_links.tqe); 685 686 /* 687 * We could check for CAM_SENT_SENSE bein set here, 688 * but since we're not maintaining any CA/UA state, 689 * there's no point. 690 */ 691 atio->sense_len = 0; 692 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE; 693 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE; 694 695 /* 696 * Any errors will not change the data we return, 697 * so make sure the queue is not left frozen. 698 * XXX - At some point there may be errors that 699 * leave us in a connected state with the 700 * initiator... 701 */ 702 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) { 703 printf("Releasing Queue\n"); 704 cam_release_devq(done_ccb->ccb_h.path, 705 /*relsim_flags*/0, 706 /*reduction*/0, 707 /*timeout*/0, 708 /*getcount_only*/0); 709 done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN; 710 } 711 desc->data_resid -= desc->data_increment; 712 xpt_release_ccb(done_ccb); 713 if (softc->state != TARGBH_STATE_TEARDOWN) { 714 715 /* 716 * Send the original accept TIO back to the 717 * controller to handle more work. 718 */ 719 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 720 ("Returning ATIO to target\n")); 721 /* Restore wildcards */ 722 atio->ccb_h.target_id = CAM_TARGET_WILDCARD; 723 atio->ccb_h.target_lun = CAM_LUN_WILDCARD; 724 xpt_action((union ccb *)atio); 725 break; 726 } else { 727 targbhfreedescr(desc); 728 free(atio, M_DEVBUF); 729 } 730 break; 731 } 732 case XPT_IMMED_NOTIFY: 733 { 734 int frozen; 735 736 frozen = (done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0; 737 if (softc->state == TARGBH_STATE_TEARDOWN 738 || done_ccb->ccb_h.status == CAM_REQ_ABORTED) { 739 printf("Freed an immediate notify\n"); 740 free(done_ccb, M_DEVBUF); 741 } else { 742 /* Requeue for another immediate event */ 743 xpt_action(done_ccb); 744 } 745 if (frozen != 0) 746 cam_release_devq(periph->path, 747 /*relsim_flags*/0, 748 /*opening reduction*/0, 749 /*timeout*/0, 750 /*getcount_only*/0); 751 break; 752 } 753 default: 754 panic("targbhdone: Unexpected ccb opcode"); 755 break; 756 } 757 } 758 759 #ifdef NOTYET 760 static int 761 targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags) 762 { 763 return 0; 764 } 765 #endif 766 767 static struct targbh_cmd_desc* 768 targbhallocdescr() 769 { 770 struct targbh_cmd_desc* descr; 771 772 /* Allocate the targbh_descr structure */ 773 descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr), 774 M_DEVBUF, M_NOWAIT); 775 if (descr == NULL) 776 return (NULL); 777 778 bzero(descr, sizeof(*descr)); 779 780 /* Allocate buffer backing store */ 781 descr->backing_store = malloc(MAX_BUF_SIZE, M_DEVBUF, M_NOWAIT); 782 if (descr->backing_store == NULL) { 783 free(descr, M_DEVBUF); 784 return (NULL); 785 } 786 descr->max_size = MAX_BUF_SIZE; 787 return (descr); 788 } 789 790 static void 791 targbhfreedescr(struct targbh_cmd_desc *descr) 792 { 793 free(descr->backing_store, M_DEVBUF); 794 free(descr, M_DEVBUF); 795 }
Cache object: e9da7b6bcbbda912d85b118f5c2c4e92
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