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>
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30__FBSDID("$FreeBSD: head/sys/cam/scsi/scsi_targ_bh.c 164906 2006-12-05 07:45:28Z mjacob $");
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30__FBSDID("$FreeBSD: head/sys/cam/scsi/scsi_targ_bh.c 168752 2007-04-15 08:49:19Z scottl $"); |
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>
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49#include <cam/cam_sim.h> |
50 51#include <cam/scsi/scsi_all.h> 52#include <cam/scsi/scsi_message.h> 53 54MALLOC_DEFINE(M_SCSIBH, "SCSI bh", "SCSI blackhole buffers"); 55 56typedef enum { 57 TARGBH_STATE_NORMAL, 58 TARGBH_STATE_EXCEPTION, 59 TARGBH_STATE_TEARDOWN 60} targbh_state; 61 62typedef enum { 63 TARGBH_FLAG_NONE = 0x00, 64 TARGBH_FLAG_LUN_ENABLED = 0x01 65} targbh_flags; 66 67typedef enum { 68 TARGBH_CCB_WORKQ, 69 TARGBH_CCB_WAITING 70} targbh_ccb_types; 71 72#define MAX_ACCEPT 8 73#define MAX_IMMEDIATE 16 74#define MAX_BUF_SIZE 256 /* Max inquiry/sense/mode page transfer */ 75 76/* Offsets into our private CCB area for storing accept information */ 77#define ccb_type ppriv_field0 78#define ccb_descr ppriv_ptr1 79 80/* We stick a pointer to the originating accept TIO in each continue I/O CCB */ 81#define ccb_atio ppriv_ptr1 82 83TAILQ_HEAD(ccb_queue, ccb_hdr); 84 85struct targbh_softc { 86 struct ccb_queue pending_queue; 87 struct ccb_queue work_queue; 88 struct ccb_queue unknown_atio_queue; 89 struct devstat device_stats; 90 targbh_state state; 91 targbh_flags flags; 92 u_int init_level; 93 u_int inq_data_len; 94 struct ccb_accept_tio *accept_tio_list; 95 struct ccb_hdr_slist immed_notify_slist; 96}; 97 98struct targbh_cmd_desc { 99 struct ccb_accept_tio* atio_link; 100 u_int data_resid; /* How much left to transfer */ 101 u_int data_increment;/* Amount to send before next disconnect */ 102 void* data; /* The data. Can be from backing_store or not */ 103 void* backing_store;/* Backing store allocated for this descriptor*/ 104 u_int max_size; /* Size of backing_store */ 105 u_int32_t timeout; 106 u_int8_t status; /* Status to return to initiator */ 107}; 108 109static struct scsi_inquiry_data no_lun_inq_data = 110{ 111 T_NODEVICE | (SID_QUAL_BAD_LU << 5), 0, 112 /* version */2, /* format version */2 113}; 114 115static struct scsi_sense_data no_lun_sense_data = 116{ 117 SSD_CURRENT_ERROR|SSD_ERRCODE_VALID, 118 0, 119 SSD_KEY_NOT_READY, 120 { 0, 0, 0, 0 }, 121 /*extra_len*/offsetof(struct scsi_sense_data, fru) 122 - offsetof(struct scsi_sense_data, extra_len), 123 { 0, 0, 0, 0 }, 124 /* Logical Unit Not Supported */ 125 /*ASC*/0x25, /*ASCQ*/0 126}; 127 128static const int request_sense_size = offsetof(struct scsi_sense_data, fru); 129 130static periph_init_t targbhinit; 131static void targbhasync(void *callback_arg, u_int32_t code, 132 struct cam_path *path, void *arg); 133static cam_status targbhenlun(struct cam_periph *periph); 134static cam_status targbhdislun(struct cam_periph *periph); 135static periph_ctor_t targbhctor; 136static periph_dtor_t targbhdtor; 137static periph_start_t targbhstart; 138static void targbhdone(struct cam_periph *periph, 139 union ccb *done_ccb); 140#ifdef NOTYET 141static int targbherror(union ccb *ccb, u_int32_t cam_flags, 142 u_int32_t sense_flags); 143#endif 144static struct targbh_cmd_desc* targbhallocdescr(void); 145static void targbhfreedescr(struct targbh_cmd_desc *buf); 146 147static struct periph_driver targbhdriver = 148{ 149 targbhinit, "targbh", 150 TAILQ_HEAD_INITIALIZER(targbhdriver.units), /* generation */ 0 151}; 152 153PERIPHDRIVER_DECLARE(targbh, targbhdriver); 154 155static void 156targbhinit(void) 157{ 158 cam_status status; 159 struct cam_path *path; 160 161 /* 162 * Install a global async callback. This callback will 163 * receive async callbacks like "new path registered". 164 */ 165 status = xpt_create_path(&path, /*periph*/NULL, CAM_XPT_PATH_ID, 166 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD); 167 168 if (status == CAM_REQ_CMP) { 169 struct ccb_setasync csa; 170 171 xpt_setup_ccb(&csa.ccb_h, path, /*priority*/5); 172 csa.ccb_h.func_code = XPT_SASYNC_CB; 173 csa.event_enable = AC_PATH_REGISTERED | AC_PATH_DEREGISTERED; 174 csa.callback = targbhasync; 175 csa.callback_arg = NULL; 176 xpt_action((union ccb *)&csa); 177 status = csa.ccb_h.status; 178 xpt_free_path(path); 179 } 180 181 if (status != CAM_REQ_CMP) { 182 printf("targbh: Failed to attach master async callback " 183 "due to status 0x%x!\n", status); 184 } 185} 186 187static void 188targbhasync(void *callback_arg, u_int32_t code, 189 struct cam_path *path, void *arg) 190{ 191 struct cam_path *new_path; 192 struct ccb_pathinq *cpi; 193 path_id_t bus_path_id; 194 cam_status status; 195 196 cpi = (struct ccb_pathinq *)arg; 197 if (code == AC_PATH_REGISTERED) 198 bus_path_id = cpi->ccb_h.path_id; 199 else 200 bus_path_id = xpt_path_path_id(path); 201 /* 202 * Allocate a peripheral instance for 203 * this target instance. 204 */ 205 status = xpt_create_path(&new_path, NULL, 206 bus_path_id, 207 CAM_TARGET_WILDCARD, CAM_LUN_WILDCARD); 208 if (status != CAM_REQ_CMP) { 209 printf("targbhasync: Unable to create path " 210 "due to status 0x%x\n", status); 211 return; 212 } 213 214 switch (code) { 215 case AC_PATH_REGISTERED: 216 { 217 /* Only attach to controllers that support target mode */ 218 if ((cpi->target_sprt & PIT_PROCESSOR) == 0) 219 break; 220 221 status = cam_periph_alloc(targbhctor, NULL, targbhdtor, 222 targbhstart, 223 "targbh", CAM_PERIPH_BIO, 224 new_path, targbhasync, 225 AC_PATH_REGISTERED, 226 cpi); 227 break; 228 } 229 case AC_PATH_DEREGISTERED: 230 { 231 struct cam_periph *periph; 232 233 if ((periph = cam_periph_find(new_path, "targbh")) != NULL) 234 cam_periph_invalidate(periph); 235 break; 236 } 237 default: 238 break; 239 } 240 xpt_free_path(new_path); 241} 242 243/* Attempt to enable our lun */ 244static cam_status 245targbhenlun(struct cam_periph *periph) 246{ 247 union ccb immed_ccb; 248 struct targbh_softc *softc; 249 cam_status status; 250 int i; 251 252 softc = (struct targbh_softc *)periph->softc; 253 254 if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) != 0) 255 return (CAM_REQ_CMP); 256 257 xpt_setup_ccb(&immed_ccb.ccb_h, periph->path, /*priority*/1); 258 immed_ccb.ccb_h.func_code = XPT_EN_LUN; 259 260 /* Don't need support for any vendor specific commands */ 261 immed_ccb.cel.grp6_len = 0; 262 immed_ccb.cel.grp7_len = 0; 263 immed_ccb.cel.enable = 1; 264 xpt_action(&immed_ccb); 265 status = immed_ccb.ccb_h.status; 266 if (status != CAM_REQ_CMP) { 267 xpt_print(periph->path, 268 "targbhenlun - Enable Lun Rejected with status 0x%x\n", 269 status); 270 return (status); 271 } 272 273 softc->flags |= TARGBH_FLAG_LUN_ENABLED; 274 275 /* 276 * Build up a buffer of accept target I/O 277 * operations for incoming selections. 278 */ 279 for (i = 0; i < MAX_ACCEPT; i++) { 280 struct ccb_accept_tio *atio; 281 282 atio = (struct ccb_accept_tio*)malloc(sizeof(*atio), M_SCSIBH, 283 M_NOWAIT); 284 if (atio == NULL) { 285 status = CAM_RESRC_UNAVAIL; 286 break; 287 } 288 289 atio->ccb_h.ccb_descr = targbhallocdescr(); 290 291 if (atio->ccb_h.ccb_descr == NULL) { 292 free(atio, M_SCSIBH); 293 status = CAM_RESRC_UNAVAIL; 294 break; 295 } 296 297 xpt_setup_ccb(&atio->ccb_h, periph->path, /*priority*/1); 298 atio->ccb_h.func_code = XPT_ACCEPT_TARGET_IO; 299 atio->ccb_h.cbfcnp = targbhdone; 300 xpt_action((union ccb *)atio); 301 status = atio->ccb_h.status; 302 if (status != CAM_REQ_INPROG) { 303 targbhfreedescr(atio->ccb_h.ccb_descr); 304 free(atio, M_SCSIBH); 305 break; 306 } 307 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link = 308 softc->accept_tio_list; 309 softc->accept_tio_list = atio; 310 } 311 312 if (i == 0) { 313 xpt_print(periph->path, 314 "targbhenlun - Could not allocate accept tio CCBs: status " 315 "= 0x%x\n", status); 316 targbhdislun(periph); 317 return (CAM_REQ_CMP_ERR); 318 } 319 320 /* 321 * Build up a buffer of immediate notify CCBs 322 * so the SIM can tell us of asynchronous target mode events. 323 */ 324 for (i = 0; i < MAX_ACCEPT; i++) { 325 struct ccb_immed_notify *inot; 326 327 inot = (struct ccb_immed_notify*)malloc(sizeof(*inot), M_SCSIBH, 328 M_NOWAIT); 329 330 if (inot == NULL) { 331 status = CAM_RESRC_UNAVAIL; 332 break; 333 } 334 335 xpt_setup_ccb(&inot->ccb_h, periph->path, /*priority*/1); 336 inot->ccb_h.func_code = XPT_IMMED_NOTIFY; 337 inot->ccb_h.cbfcnp = targbhdone; 338 xpt_action((union ccb *)inot); 339 status = inot->ccb_h.status; 340 if (status != CAM_REQ_INPROG) { 341 free(inot, M_SCSIBH); 342 break; 343 } 344 SLIST_INSERT_HEAD(&softc->immed_notify_slist, &inot->ccb_h, 345 periph_links.sle); 346 } 347 348 if (i == 0) { 349 xpt_print(periph->path, 350 "targbhenlun - Could not allocate immediate notify " 351 "CCBs: status = 0x%x\n", status); 352 targbhdislun(periph); 353 return (CAM_REQ_CMP_ERR); 354 } 355 356 return (CAM_REQ_CMP); 357} 358 359static cam_status 360targbhdislun(struct cam_periph *periph) 361{ 362 union ccb ccb; 363 struct targbh_softc *softc; 364 struct ccb_accept_tio* atio; 365 struct ccb_hdr *ccb_h; 366 367 softc = (struct targbh_softc *)periph->softc; 368 if ((softc->flags & TARGBH_FLAG_LUN_ENABLED) == 0) 369 return CAM_REQ_CMP; 370 371 /* XXX Block for Continue I/O completion */ 372 373 /* Kill off all ACCECPT and IMMEDIATE CCBs */ 374 while ((atio = softc->accept_tio_list) != NULL) { 375 376 softc->accept_tio_list = 377 ((struct targbh_cmd_desc*)atio->ccb_h.ccb_descr)->atio_link; 378 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1); 379 ccb.cab.ccb_h.func_code = XPT_ABORT; 380 ccb.cab.abort_ccb = (union ccb *)atio; 381 xpt_action(&ccb); 382 } 383 384 while ((ccb_h = SLIST_FIRST(&softc->immed_notify_slist)) != NULL) { 385 SLIST_REMOVE_HEAD(&softc->immed_notify_slist, periph_links.sle); 386 xpt_setup_ccb(&ccb.cab.ccb_h, periph->path, /*priority*/1); 387 ccb.cab.ccb_h.func_code = XPT_ABORT; 388 ccb.cab.abort_ccb = (union ccb *)ccb_h; 389 xpt_action(&ccb); 390 } 391 392 /* 393 * Dissable this lun. 394 */ 395 xpt_setup_ccb(&ccb.cel.ccb_h, periph->path, /*priority*/1); 396 ccb.cel.ccb_h.func_code = XPT_EN_LUN; 397 ccb.cel.enable = 0; 398 xpt_action(&ccb); 399 400 if (ccb.cel.ccb_h.status != CAM_REQ_CMP) 401 printf("targbhdislun - Disabling lun on controller failed " 402 "with status 0x%x\n", ccb.cel.ccb_h.status); 403 else 404 softc->flags &= ~TARGBH_FLAG_LUN_ENABLED; 405 return (ccb.cel.ccb_h.status); 406} 407 408static cam_status 409targbhctor(struct cam_periph *periph, void *arg) 410{ 411 struct targbh_softc *softc; 412 413 /* Allocate our per-instance private storage */ 414 softc = (struct targbh_softc *)malloc(sizeof(*softc), 415 M_SCSIBH, M_NOWAIT); 416 if (softc == NULL) { 417 printf("targctor: unable to malloc softc\n"); 418 return (CAM_REQ_CMP_ERR); 419 } 420 421 bzero(softc, sizeof(*softc)); 422 TAILQ_INIT(&softc->pending_queue); 423 TAILQ_INIT(&softc->work_queue); 424 softc->accept_tio_list = NULL; 425 SLIST_INIT(&softc->immed_notify_slist); 426 softc->state = TARGBH_STATE_NORMAL; 427 periph->softc = softc; 428 softc->init_level++; 429 430 return (targbhenlun(periph)); 431} 432 433static void 434targbhdtor(struct cam_periph *periph) 435{ 436 struct targbh_softc *softc; 437 438 softc = (struct targbh_softc *)periph->softc; 439 440 softc->state = TARGBH_STATE_TEARDOWN; 441 442 targbhdislun(periph); 443 444 switch (softc->init_level) { 445 case 0: 446 panic("targdtor - impossible init level");; 447 case 1: 448 /* FALLTHROUGH */ 449 default: 450 /* XXX Wait for callback of targbhdislun() */
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450 tsleep(softc, PRIBIO, "targbh", hz/2);
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451 msleep(softc, periph->sim->mtx, PRIBIO, "targbh", hz/2); |
452 free(softc, M_SCSIBH); 453 break; 454 } 455} 456 457static void 458targbhstart(struct cam_periph *periph, union ccb *start_ccb) 459{ 460 struct targbh_softc *softc; 461 struct ccb_hdr *ccbh; 462 struct ccb_accept_tio *atio; 463 struct targbh_cmd_desc *desc; 464 struct ccb_scsiio *csio; 465 ccb_flags flags;
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465 int s;
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466 467 softc = (struct targbh_softc *)periph->softc; 468
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469 s = splbio();
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469 ccbh = TAILQ_FIRST(&softc->work_queue); 470 if (periph->immediate_priority <= periph->pinfo.priority) { 471 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WAITING; 472 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h, 473 periph_links.sle); 474 periph->immediate_priority = CAM_PRIORITY_NONE;
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476 splx(s);
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475 wakeup(&periph->ccb_list); 476 } else if (ccbh == NULL) {
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479 splx(s);
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477 xpt_release_ccb(start_ccb); 478 } else { 479 TAILQ_REMOVE(&softc->work_queue, ccbh, periph_links.tqe); 480 TAILQ_INSERT_HEAD(&softc->pending_queue, ccbh, 481 periph_links.tqe);
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485 splx(s);
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482 atio = (struct ccb_accept_tio*)ccbh; 483 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr; 484 485 /* Is this a tagged request? */ 486 flags = atio->ccb_h.flags & 487 (CAM_DIS_DISCONNECT|CAM_TAG_ACTION_VALID|CAM_DIR_MASK); 488 489 csio = &start_ccb->csio; 490 /* 491 * If we are done with the transaction, tell the 492 * controller to send status and perform a CMD_CMPLT. 493 * If we have associated sense data, see if we can 494 * send that too. 495 */ 496 if (desc->data_resid == desc->data_increment) { 497 flags |= CAM_SEND_STATUS; 498 if (atio->sense_len) { 499 csio->sense_len = atio->sense_len; 500 csio->sense_data = atio->sense_data; 501 flags |= CAM_SEND_SENSE; 502 } 503 504 } 505 506 cam_fill_ctio(csio, 507 /*retries*/2, 508 targbhdone, 509 flags, 510 (flags & CAM_TAG_ACTION_VALID)? 511 MSG_SIMPLE_Q_TAG : 0, 512 atio->tag_id, 513 atio->init_id, 514 desc->status, 515 /*data_ptr*/desc->data_increment == 0 516 ? NULL : desc->data, 517 /*dxfer_len*/desc->data_increment, 518 /*timeout*/desc->timeout); 519 520 /* Override our wildcard attachment */ 521 start_ccb->ccb_h.target_id = atio->ccb_h.target_id; 522 start_ccb->ccb_h.target_lun = atio->ccb_h.target_lun; 523 524 start_ccb->ccb_h.ccb_type = TARGBH_CCB_WORKQ; 525 start_ccb->ccb_h.ccb_atio = atio; 526 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 527 ("Sending a CTIO\n")); 528 xpt_action(start_ccb); 529 /* 530 * If the queue was frozen waiting for the response 531 * to this ATIO (for instance disconnection was disallowed), 532 * then release it now that our response has been queued. 533 */ 534 if ((atio->ccb_h.status & CAM_DEV_QFRZN) != 0) { 535 cam_release_devq(periph->path, 536 /*relsim_flags*/0, 537 /*reduction*/0, 538 /*timeout*/0, 539 /*getcount_only*/0); 540 atio->ccb_h.status &= ~CAM_DEV_QFRZN; 541 }
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546 s = splbio();
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542 ccbh = TAILQ_FIRST(&softc->work_queue);
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548 splx(s);
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543 } 544 if (ccbh != NULL) 545 xpt_schedule(periph, /*priority*/1); 546} 547 548static void 549targbhdone(struct cam_periph *periph, union ccb *done_ccb) 550{ 551 struct targbh_softc *softc; 552 553 softc = (struct targbh_softc *)periph->softc; 554 555 if (done_ccb->ccb_h.ccb_type == TARGBH_CCB_WAITING) { 556 /* Caller will release the CCB */ 557 wakeup(&done_ccb->ccb_h.cbfcnp); 558 return; 559 } 560 561 switch (done_ccb->ccb_h.func_code) { 562 case XPT_ACCEPT_TARGET_IO: 563 { 564 struct ccb_accept_tio *atio; 565 struct targbh_cmd_desc *descr; 566 u_int8_t *cdb; 567 int priority; 568 569 atio = &done_ccb->atio; 570 descr = (struct targbh_cmd_desc*)atio->ccb_h.ccb_descr; 571 cdb = atio->cdb_io.cdb_bytes; 572 if (softc->state == TARGBH_STATE_TEARDOWN 573 || atio->ccb_h.status == CAM_REQ_ABORTED) { 574 targbhfreedescr(descr); 575 xpt_free_ccb(done_ccb); 576 return; 577 } 578 579 /* 580 * Determine the type of incoming command and 581 * setup our buffer for a response. 582 */ 583 switch (cdb[0]) { 584 case INQUIRY: 585 { 586 struct scsi_inquiry *inq; 587 588 inq = (struct scsi_inquiry *)cdb; 589 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 590 ("Saw an inquiry!\n")); 591 /* 592 * Validate the command. We don't 593 * support any VPD pages, so complain 594 * if EVPD is set. 595 */ 596 if ((inq->byte2 & SI_EVPD) != 0 597 || inq->page_code != 0) { 598 atio->ccb_h.flags &= ~CAM_DIR_MASK; 599 atio->ccb_h.flags |= CAM_DIR_NONE; 600 /* 601 * This needs to have other than a 602 * no_lun_sense_data response. 603 */ 604 atio->sense_data = no_lun_sense_data; 605 atio->sense_len = sizeof(no_lun_sense_data); 606 descr->data_resid = 0; 607 descr->data_increment = 0; 608 descr->status = SCSI_STATUS_CHECK_COND; 609 break; 610 } 611 /* 612 * Direction is always relative 613 * to the initator. 614 */ 615 atio->ccb_h.flags &= ~CAM_DIR_MASK; 616 atio->ccb_h.flags |= CAM_DIR_IN; 617 descr->data = &no_lun_inq_data; 618 descr->data_resid = MIN(sizeof(no_lun_inq_data), 619 SCSI_CDB6_LEN(inq->length)); 620 descr->data_increment = descr->data_resid; 621 descr->timeout = 5 * 1000; 622 descr->status = SCSI_STATUS_OK; 623 break; 624 } 625 case REQUEST_SENSE: 626 { 627 struct scsi_request_sense *rsense; 628 629 rsense = (struct scsi_request_sense *)cdb; 630 /* Refer to static sense data */ 631 atio->ccb_h.flags &= ~CAM_DIR_MASK; 632 atio->ccb_h.flags |= CAM_DIR_IN; 633 descr->data = &no_lun_sense_data; 634 descr->data_resid = request_sense_size; 635 descr->data_resid = MIN(descr->data_resid, 636 SCSI_CDB6_LEN(rsense->length)); 637 descr->data_increment = descr->data_resid; 638 descr->timeout = 5 * 1000; 639 descr->status = SCSI_STATUS_OK; 640 break; 641 } 642 default: 643 /* Constant CA, tell initiator */ 644 /* Direction is always relative to the initator */ 645 atio->ccb_h.flags &= ~CAM_DIR_MASK; 646 atio->ccb_h.flags |= CAM_DIR_NONE; 647 atio->sense_data = no_lun_sense_data; 648 atio->sense_len = sizeof (no_lun_sense_data); 649 descr->data_resid = 0; 650 descr->data_increment = 0; 651 descr->timeout = 5 * 1000; 652 descr->status = SCSI_STATUS_CHECK_COND; 653 break; 654 } 655 656 /* Queue us up to receive a Continue Target I/O ccb. */ 657 if ((atio->ccb_h.flags & CAM_DIS_DISCONNECT) != 0) { 658 TAILQ_INSERT_HEAD(&softc->work_queue, &atio->ccb_h, 659 periph_links.tqe); 660 priority = 0; 661 } else { 662 TAILQ_INSERT_TAIL(&softc->work_queue, &atio->ccb_h, 663 periph_links.tqe); 664 priority = 1; 665 } 666 xpt_schedule(periph, priority); 667 break; 668 } 669 case XPT_CONT_TARGET_IO: 670 { 671 struct ccb_accept_tio *atio; 672 struct targbh_cmd_desc *desc; 673 674 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 675 ("Received completed CTIO\n")); 676 atio = (struct ccb_accept_tio*)done_ccb->ccb_h.ccb_atio; 677 desc = (struct targbh_cmd_desc *)atio->ccb_h.ccb_descr; 678 679 TAILQ_REMOVE(&softc->pending_queue, &atio->ccb_h, 680 periph_links.tqe); 681 682 /* 683 * We could check for CAM_SENT_SENSE bein set here, 684 * but since we're not maintaining any CA/UA state, 685 * there's no point. 686 */ 687 atio->sense_len = 0; 688 done_ccb->ccb_h.flags &= ~CAM_SEND_SENSE; 689 done_ccb->ccb_h.status &= ~CAM_SENT_SENSE; 690 691 /* 692 * Any errors will not change the data we return, 693 * so make sure the queue is not left frozen. 694 * XXX - At some point there may be errors that 695 * leave us in a connected state with the 696 * initiator... 697 */ 698 if ((done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0) { 699 printf("Releasing Queue\n"); 700 cam_release_devq(done_ccb->ccb_h.path, 701 /*relsim_flags*/0, 702 /*reduction*/0, 703 /*timeout*/0, 704 /*getcount_only*/0); 705 done_ccb->ccb_h.status &= ~CAM_DEV_QFRZN; 706 } 707 desc->data_resid -= desc->data_increment; 708 xpt_release_ccb(done_ccb); 709 if (softc->state != TARGBH_STATE_TEARDOWN) { 710 711 /* 712 * Send the original accept TIO back to the 713 * controller to handle more work. 714 */ 715 CAM_DEBUG(periph->path, CAM_DEBUG_SUBTRACE, 716 ("Returning ATIO to target\n")); 717 /* Restore wildcards */ 718 atio->ccb_h.target_id = CAM_TARGET_WILDCARD; 719 atio->ccb_h.target_lun = CAM_LUN_WILDCARD; 720 xpt_action((union ccb *)atio); 721 break; 722 } else { 723 targbhfreedescr(desc); 724 free(atio, M_SCSIBH); 725 } 726 break; 727 } 728 case XPT_IMMED_NOTIFY: 729 { 730 int frozen; 731 732 frozen = (done_ccb->ccb_h.status & CAM_DEV_QFRZN) != 0; 733 if (softc->state == TARGBH_STATE_TEARDOWN 734 || done_ccb->ccb_h.status == CAM_REQ_ABORTED) { 735 printf("Freed an immediate notify\n"); 736 xpt_free_ccb(done_ccb); 737 } else { 738 /* Requeue for another immediate event */ 739 xpt_action(done_ccb); 740 } 741 if (frozen != 0) 742 cam_release_devq(periph->path, 743 /*relsim_flags*/0, 744 /*opening reduction*/0, 745 /*timeout*/0, 746 /*getcount_only*/0); 747 break; 748 } 749 default: 750 panic("targbhdone: Unexpected ccb opcode"); 751 break; 752 } 753} 754 755#ifdef NOTYET 756static int 757targbherror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags) 758{ 759 return 0; 760} 761#endif 762 763static struct targbh_cmd_desc* 764targbhallocdescr() 765{ 766 struct targbh_cmd_desc* descr; 767 768 /* Allocate the targbh_descr structure */ 769 descr = (struct targbh_cmd_desc *)malloc(sizeof(*descr), 770 M_SCSIBH, M_NOWAIT); 771 if (descr == NULL) 772 return (NULL); 773 774 bzero(descr, sizeof(*descr)); 775 776 /* Allocate buffer backing store */ 777 descr->backing_store = malloc(MAX_BUF_SIZE, M_SCSIBH, M_NOWAIT); 778 if (descr->backing_store == NULL) { 779 free(descr, M_SCSIBH); 780 return (NULL); 781 } 782 descr->max_size = MAX_BUF_SIZE; 783 return (descr); 784} 785 786static void 787targbhfreedescr(struct targbh_cmd_desc *descr) 788{ 789 free(descr->backing_store, M_SCSIBH); 790 free(descr, M_SCSIBH); 791}
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