scsi_pass.c revision 251837
1180740Sdes/*- 2180740Sdes * Copyright (c) 1997, 1998, 2000 Justin T. Gibbs. 3180740Sdes * Copyright (c) 1997, 1998, 1999 Kenneth D. Merry. 4218767Sdes * All rights reserved. 5180740Sdes * 6180740Sdes * Redistribution and use in source and binary forms, with or without 7239844Sdes * modification, are permitted provided that the following conditions 8204861Sdes * are met: 9204861Sdes * 1. Redistributions of source code must retain the above copyright 10180740Sdes * notice, this list of conditions, and the following disclaimer, 11180740Sdes * without modification, immediately at the beginning of the file. 12218767Sdes * 2. The name of the author may not be used to endorse or promote products 13180740Sdes * derived from this software without specific prior written permission. 14262566Sdes * 15262566Sdes * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16262566Sdes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17262566Sdes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18262566Sdes * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 19180740Sdes * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20204861Sdes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21204861Sdes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22204861Sdes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23204861Sdes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24214979Sdes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25214979Sdes * SUCH DAMAGE. 26214979Sdes */ 27180740Sdes 28180740Sdes#include <sys/cdefs.h> 29180740Sdes__FBSDID("$FreeBSD: head/sys/cam/scsi/scsi_pass.c 251837 2013-06-17 08:57:09Z scottl $"); 30180740Sdes 31180740Sdes#include <sys/param.h> 32214979Sdes#include <sys/systm.h> 33214979Sdes#include <sys/kernel.h> 34214979Sdes#include <sys/types.h> 35180740Sdes#include <sys/bio.h> 36180740Sdes#include <sys/malloc.h> 37180740Sdes#include <sys/fcntl.h> 38180744Sdes#include <sys/conf.h> 39214979Sdes#include <sys/errno.h> 40248613Sdes#include <sys/devicestat.h> 41248613Sdes#include <sys/proc.h> 42248613Sdes#include <sys/taskqueue.h> 43248613Sdes 44248613Sdes#include <cam/cam.h> 45180740Sdes#include <cam/cam_ccb.h> 46204861Sdes#include <cam/cam_periph.h> 47204861Sdes#include <cam/cam_queue.h> 48180740Sdes#include <cam/cam_xpt_periph.h> 49248613Sdes#include <cam/cam_debug.h> 50248613Sdes#include <cam/cam_sim.h> 51239844Sdes#include <cam/cam_compat.h> 52214979Sdes 53214979Sdes#include <cam/scsi/scsi_all.h> 54180740Sdes#include <cam/scsi/scsi_pass.h> 55180740Sdes 56180740Sdestypedef enum { 57180740Sdes PASS_FLAG_OPEN = 0x01, 58204861Sdes PASS_FLAG_LOCKED = 0x02, 59204861Sdes PASS_FLAG_INVALID = 0x04, 60180740Sdes PASS_FLAG_INITIAL_PHYSPATH = 0x08 61180740Sdes} pass_flags; 62180740Sdes 63214979Sdestypedef enum { 64214979Sdes PASS_STATE_NORMAL 65180740Sdes} pass_state; 66180740Sdes 67180740Sdestypedef enum { 68180740Sdes PASS_CCB_BUFFER_IO, 69180740Sdes PASS_CCB_WAITING 70180740Sdes} pass_ccb_types; 71180740Sdes 72180740Sdes#define ccb_type ppriv_field0 73180740Sdes#define ccb_bp ppriv_ptr1 74180740Sdes 75180740Sdesstruct pass_softc { 76180740Sdes pass_state state; 77180740Sdes pass_flags flags; 78180740Sdes u_int8_t pd_type; 79180740Sdes union ccb saved_ccb; 80180740Sdes int open_count; 81180740Sdes struct devstat *device_stats; 82204861Sdes struct cdev *dev; 83180740Sdes struct cdev *alias_dev; 84180740Sdes struct task add_physpath_task; 85180740Sdes}; 86180740Sdes 87180740Sdes 88180740Sdesstatic d_open_t passopen; 89180740Sdesstatic d_close_t passclose; 90180740Sdesstatic d_ioctl_t passioctl; 91180740Sdesstatic d_ioctl_t passdoioctl; 92180740Sdes 93180740Sdesstatic periph_init_t passinit; 94218767Sdesstatic periph_ctor_t passregister; 95218767Sdesstatic periph_oninv_t passoninvalidate; 96218767Sdesstatic periph_dtor_t passcleanup; 97218767Sdesstatic periph_start_t passstart; 98262566Sdesstatic void pass_add_physpath(void *context, int pending); 99262566Sdesstatic void passasync(void *callback_arg, u_int32_t code, 100262566Sdes struct cam_path *path, void *arg); 101262566Sdesstatic void passdone(struct cam_periph *periph, 102180740Sdes union ccb *done_ccb); 103180740Sdesstatic int passerror(union ccb *ccb, u_int32_t cam_flags, 104180740Sdes u_int32_t sense_flags); 105180740Sdesstatic int passsendccb(struct cam_periph *periph, union ccb *ccb, 106180740Sdes union ccb *inccb); 107180740Sdes 108180740Sdesstatic struct periph_driver passdriver = 109218767Sdes{ 110180740Sdes passinit, "pass", 111180740Sdes TAILQ_HEAD_INITIALIZER(passdriver.units), /* generation */ 0 112180740Sdes}; 113180740Sdes 114180740SdesPERIPHDRIVER_DECLARE(pass, passdriver); 115180740Sdes 116180740Sdesstatic struct cdevsw pass_cdevsw = { 117180740Sdes .d_version = D_VERSION, 118180740Sdes .d_flags = D_TRACKCLOSE, 119214979Sdes .d_open = passopen, 120214979Sdes .d_close = passclose, 121180740Sdes .d_ioctl = passioctl, 122180740Sdes .d_name = "pass", 123264377Sdes}; 124 125static void 126passinit(void) 127{ 128 cam_status status; 129 130 /* 131 * Install a global async callback. This callback will 132 * receive async callbacks like "new device found". 133 */ 134 status = xpt_register_async(AC_FOUND_DEVICE, passasync, NULL, NULL); 135 136 if (status != CAM_REQ_CMP) { 137 printf("pass: Failed to attach master async callback " 138 "due to status 0x%x!\n", status); 139 } 140 141} 142 143static void 144passdevgonecb(void *arg) 145{ 146 struct cam_sim *sim; 147 struct cam_periph *periph; 148 struct pass_softc *softc; 149 int i; 150 151 periph = (struct cam_periph *)arg; 152 sim = periph->sim; 153 softc = (struct pass_softc *)periph->softc; 154 155 KASSERT(softc->open_count >= 0, ("Negative open count %d", 156 softc->open_count)); 157 158 mtx_lock(sim->mtx); 159 160 /* 161 * When we get this callback, we will get no more close calls from 162 * devfs. So if we have any dangling opens, we need to release the 163 * reference held for that particular context. 164 */ 165 for (i = 0; i < softc->open_count; i++) 166 cam_periph_release_locked(periph); 167 168 softc->open_count = 0; 169 170 /* 171 * Release the reference held for the device node, it is gone now. 172 */ 173 cam_periph_release_locked(periph); 174 175 /* 176 * We reference the SIM lock directly here, instead of using 177 * cam_periph_unlock(). The reason is that the final call to 178 * cam_periph_release_locked() above could result in the periph 179 * getting freed. If that is the case, dereferencing the periph 180 * with a cam_periph_unlock() call would cause a page fault. 181 */ 182 mtx_unlock(sim->mtx); 183} 184 185static void 186passoninvalidate(struct cam_periph *periph) 187{ 188 struct pass_softc *softc; 189 190 softc = (struct pass_softc *)periph->softc; 191 192 /* 193 * De-register any async callbacks. 194 */ 195 xpt_register_async(0, passasync, periph, periph->path); 196 197 softc->flags |= PASS_FLAG_INVALID; 198 199 /* 200 * Tell devfs this device has gone away, and ask for a callback 201 * when it has cleaned up its state. 202 */ 203 destroy_dev_sched_cb(softc->dev, passdevgonecb, periph); 204 205 /* 206 * XXX Return all queued I/O with ENXIO. 207 * XXX Handle any transactions queued to the card 208 * with XPT_ABORT_CCB. 209 */ 210 211 if (bootverbose) { 212 xpt_print(periph->path, "lost device\n"); 213 } 214 215} 216 217static void 218passcleanup(struct cam_periph *periph) 219{ 220 struct pass_softc *softc; 221 222 softc = (struct pass_softc *)periph->softc; 223 224 if (bootverbose) 225 xpt_print(periph->path, "removing device entry\n"); 226 devstat_remove_entry(softc->device_stats); 227 228 cam_periph_unlock(periph); 229 taskqueue_drain(taskqueue_thread, &softc->add_physpath_task); 230 231 cam_periph_lock(periph); 232 233 free(softc, M_DEVBUF); 234} 235 236static void 237pass_add_physpath(void *context, int pending) 238{ 239 struct cam_periph *periph; 240 struct pass_softc *softc; 241 char *physpath; 242 243 /* 244 * If we have one, create a devfs alias for our 245 * physical path. 246 */ 247 periph = context; 248 softc = periph->softc; 249 physpath = malloc(MAXPATHLEN, M_DEVBUF, M_WAITOK); 250 cam_periph_lock(periph); 251 if (periph->flags & CAM_PERIPH_INVALID) { 252 cam_periph_unlock(periph); 253 goto out; 254 } 255 if (xpt_getattr(physpath, MAXPATHLEN, 256 "GEOM::physpath", periph->path) == 0 257 && strlen(physpath) != 0) { 258 259 cam_periph_unlock(periph); 260 make_dev_physpath_alias(MAKEDEV_WAITOK, &softc->alias_dev, 261 softc->dev, softc->alias_dev, physpath); 262 cam_periph_lock(periph); 263 } 264 265 /* 266 * Now that we've made our alias, we no longer have to have a 267 * reference to the device. 268 */ 269 if ((softc->flags & PASS_FLAG_INITIAL_PHYSPATH) == 0) { 270 softc->flags |= PASS_FLAG_INITIAL_PHYSPATH; 271 cam_periph_unlock(periph); 272 dev_rel(softc->dev); 273 } 274 else 275 cam_periph_unlock(periph); 276 277out: 278 free(physpath, M_DEVBUF); 279} 280 281static void 282passasync(void *callback_arg, u_int32_t code, 283 struct cam_path *path, void *arg) 284{ 285 struct cam_periph *periph; 286 287 periph = (struct cam_periph *)callback_arg; 288 289 switch (code) { 290 case AC_FOUND_DEVICE: 291 { 292 struct ccb_getdev *cgd; 293 cam_status status; 294 295 cgd = (struct ccb_getdev *)arg; 296 if (cgd == NULL) 297 break; 298 299 /* 300 * Allocate a peripheral instance for 301 * this device and start the probe 302 * process. 303 */ 304 status = cam_periph_alloc(passregister, passoninvalidate, 305 passcleanup, passstart, "pass", 306 CAM_PERIPH_BIO, cgd->ccb_h.path, 307 passasync, AC_FOUND_DEVICE, cgd); 308 309 if (status != CAM_REQ_CMP 310 && status != CAM_REQ_INPROG) { 311 const struct cam_status_entry *entry; 312 313 entry = cam_fetch_status_entry(status); 314 315 printf("passasync: Unable to attach new device " 316 "due to status %#x: %s\n", status, entry ? 317 entry->status_text : "Unknown"); 318 } 319 320 break; 321 } 322 case AC_ADVINFO_CHANGED: 323 { 324 uintptr_t buftype; 325 326 buftype = (uintptr_t)arg; 327 if (buftype == CDAI_TYPE_PHYS_PATH) { 328 struct pass_softc *softc; 329 330 softc = (struct pass_softc *)periph->softc; 331 taskqueue_enqueue(taskqueue_thread, 332 &softc->add_physpath_task); 333 } 334 break; 335 } 336 default: 337 cam_periph_async(periph, code, path, arg); 338 break; 339 } 340} 341 342static cam_status 343passregister(struct cam_periph *periph, void *arg) 344{ 345 struct pass_softc *softc; 346 struct ccb_getdev *cgd; 347 struct ccb_pathinq cpi; 348 int no_tags; 349 350 cgd = (struct ccb_getdev *)arg; 351 if (cgd == NULL) { 352 printf("%s: no getdev CCB, can't register device\n", __func__); 353 return(CAM_REQ_CMP_ERR); 354 } 355 356 softc = (struct pass_softc *)malloc(sizeof(*softc), 357 M_DEVBUF, M_NOWAIT); 358 359 if (softc == NULL) { 360 printf("%s: Unable to probe new device. " 361 "Unable to allocate softc\n", __func__); 362 return(CAM_REQ_CMP_ERR); 363 } 364 365 bzero(softc, sizeof(*softc)); 366 softc->state = PASS_STATE_NORMAL; 367 if (cgd->protocol == PROTO_SCSI || cgd->protocol == PROTO_ATAPI) 368 softc->pd_type = SID_TYPE(&cgd->inq_data); 369 else if (cgd->protocol == PROTO_SATAPM) 370 softc->pd_type = T_ENCLOSURE; 371 else 372 softc->pd_type = T_DIRECT; 373 374 periph->softc = softc; 375 376 bzero(&cpi, sizeof(cpi)); 377 xpt_setup_ccb(&cpi.ccb_h, periph->path, CAM_PRIORITY_NORMAL); 378 cpi.ccb_h.func_code = XPT_PATH_INQ; 379 xpt_action((union ccb *)&cpi); 380 381 /* 382 * We pass in 0 for a blocksize, since we don't 383 * know what the blocksize of this device is, if 384 * it even has a blocksize. 385 */ 386 cam_periph_unlock(periph); 387 no_tags = (cgd->inq_data.flags & SID_CmdQue) == 0; 388 softc->device_stats = devstat_new_entry("pass", 389 periph->unit_number, 0, 390 DEVSTAT_NO_BLOCKSIZE 391 | (no_tags ? DEVSTAT_NO_ORDERED_TAGS : 0), 392 softc->pd_type | 393 XPORT_DEVSTAT_TYPE(cpi.transport) | 394 DEVSTAT_TYPE_PASS, 395 DEVSTAT_PRIORITY_PASS); 396 397 /* 398 * Acquire a reference to the periph before we create the devfs 399 * instance for it. We'll release this reference once the devfs 400 * instance has been freed. 401 */ 402 if (cam_periph_acquire(periph) != CAM_REQ_CMP) { 403 xpt_print(periph->path, "%s: lost periph during " 404 "registration!\n", __func__); 405 cam_periph_lock(periph); 406 return (CAM_REQ_CMP_ERR); 407 } 408 409 /* Register the device */ 410 softc->dev = make_dev(&pass_cdevsw, periph->unit_number, 411 UID_ROOT, GID_OPERATOR, 0600, "%s%d", 412 periph->periph_name, periph->unit_number); 413 414 /* 415 * Now that we have made the devfs instance, hold a reference to it 416 * until the task queue has run to setup the physical path alias. 417 * That way devfs won't get rid of the device before we add our 418 * alias. 419 */ 420 dev_ref(softc->dev); 421 422 cam_periph_lock(periph); 423 softc->dev->si_drv1 = periph; 424 425 TASK_INIT(&softc->add_physpath_task, /*priority*/0, 426 pass_add_physpath, periph); 427 428 /* 429 * See if physical path information is already available. 430 */ 431 taskqueue_enqueue(taskqueue_thread, &softc->add_physpath_task); 432 433 /* 434 * Add an async callback so that we get notified if 435 * this device goes away or its physical path 436 * (stored in the advanced info data of the EDT) has 437 * changed. 438 */ 439 xpt_register_async(AC_LOST_DEVICE | AC_ADVINFO_CHANGED, 440 passasync, periph, periph->path); 441 442 if (bootverbose) 443 xpt_announce_periph(periph, NULL); 444 445 return(CAM_REQ_CMP); 446} 447 448static int 449passopen(struct cdev *dev, int flags, int fmt, struct thread *td) 450{ 451 struct cam_periph *periph; 452 struct pass_softc *softc; 453 int error; 454 455 periph = (struct cam_periph *)dev->si_drv1; 456 if (cam_periph_acquire(periph) != CAM_REQ_CMP) 457 return (ENXIO); 458 459 cam_periph_lock(periph); 460 461 softc = (struct pass_softc *)periph->softc; 462 463 if (softc->flags & PASS_FLAG_INVALID) { 464 cam_periph_release_locked(periph); 465 cam_periph_unlock(periph); 466 return(ENXIO); 467 } 468 469 /* 470 * Don't allow access when we're running at a high securelevel. 471 */ 472 error = securelevel_gt(td->td_ucred, 1); 473 if (error) { 474 cam_periph_release_locked(periph); 475 cam_periph_unlock(periph); 476 return(error); 477 } 478 479 /* 480 * Only allow read-write access. 481 */ 482 if (((flags & FWRITE) == 0) || ((flags & FREAD) == 0)) { 483 cam_periph_release_locked(periph); 484 cam_periph_unlock(periph); 485 return(EPERM); 486 } 487 488 /* 489 * We don't allow nonblocking access. 490 */ 491 if ((flags & O_NONBLOCK) != 0) { 492 xpt_print(periph->path, "can't do nonblocking access\n"); 493 cam_periph_release_locked(periph); 494 cam_periph_unlock(periph); 495 return(EINVAL); 496 } 497 498 softc->open_count++; 499 500 cam_periph_unlock(periph); 501 502 return (error); 503} 504 505static int 506passclose(struct cdev *dev, int flag, int fmt, struct thread *td) 507{ 508 struct cam_sim *sim; 509 struct cam_periph *periph; 510 struct pass_softc *softc; 511 512 periph = (struct cam_periph *)dev->si_drv1; 513 if (periph == NULL) 514 return (ENXIO); 515 516 sim = periph->sim; 517 softc = periph->softc; 518 519 mtx_lock(sim->mtx); 520 521 softc->open_count--; 522 523 cam_periph_release_locked(periph); 524 525 /* 526 * We reference the SIM lock directly here, instead of using 527 * cam_periph_unlock(). The reason is that the call to 528 * cam_periph_release_locked() above could result in the periph 529 * getting freed. If that is the case, dereferencing the periph 530 * with a cam_periph_unlock() call would cause a page fault. 531 * 532 * cam_periph_release() avoids this problem using the same method, 533 * but we're manually acquiring and dropping the lock here to 534 * protect the open count and avoid another lock acquisition and 535 * release. 536 */ 537 mtx_unlock(sim->mtx); 538 539 return (0); 540} 541 542static void 543passstart(struct cam_periph *periph, union ccb *start_ccb) 544{ 545 struct pass_softc *softc; 546 547 softc = (struct pass_softc *)periph->softc; 548 549 switch (softc->state) { 550 case PASS_STATE_NORMAL: 551 start_ccb->ccb_h.ccb_type = PASS_CCB_WAITING; 552 SLIST_INSERT_HEAD(&periph->ccb_list, &start_ccb->ccb_h, 553 periph_links.sle); 554 periph->immediate_priority = CAM_PRIORITY_NONE; 555 wakeup(&periph->ccb_list); 556 break; 557 } 558} 559 560static void 561passdone(struct cam_periph *periph, union ccb *done_ccb) 562{ 563 struct pass_softc *softc; 564 struct ccb_scsiio *csio; 565 566 softc = (struct pass_softc *)periph->softc; 567 csio = &done_ccb->csio; 568 switch (csio->ccb_h.ccb_type) { 569 case PASS_CCB_WAITING: 570 /* Caller will release the CCB */ 571 wakeup(&done_ccb->ccb_h.cbfcnp); 572 return; 573 } 574 xpt_release_ccb(done_ccb); 575} 576 577static int 578passioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td) 579{ 580 int error; 581 582 if ((error = passdoioctl(dev, cmd, addr, flag, td)) == ENOTTY) { 583 error = cam_compat_ioctl(dev, &cmd, &addr, &flag, td); 584 if (error == EAGAIN) 585 return (passdoioctl(dev, cmd, addr, flag, td)); 586 } 587 return (error); 588} 589 590static int 591passdoioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td) 592{ 593 struct cam_periph *periph; 594 struct pass_softc *softc; 595 int error; 596 uint32_t priority; 597 598 periph = (struct cam_periph *)dev->si_drv1; 599 if (periph == NULL) 600 return(ENXIO); 601 602 cam_periph_lock(periph); 603 softc = (struct pass_softc *)periph->softc; 604 605 error = 0; 606 607 switch (cmd) { 608 609 case CAMIOCOMMAND: 610 { 611 union ccb *inccb; 612 union ccb *ccb; 613 int ccb_malloced; 614 615 inccb = (union ccb *)addr; 616 617 /* 618 * Some CCB types, like scan bus and scan lun can only go 619 * through the transport layer device. 620 */ 621 if (inccb->ccb_h.func_code & XPT_FC_XPT_ONLY) { 622 xpt_print(periph->path, "CCB function code %#x is " 623 "restricted to the XPT device\n", 624 inccb->ccb_h.func_code); 625 error = ENODEV; 626 break; 627 } 628 629 /* Compatibility for RL/priority-unaware code. */ 630 priority = inccb->ccb_h.pinfo.priority; 631 if (priority <= CAM_PRIORITY_OOB) 632 priority += CAM_PRIORITY_OOB + 1; 633 634 /* 635 * Non-immediate CCBs need a CCB from the per-device pool 636 * of CCBs, which is scheduled by the transport layer. 637 * Immediate CCBs and user-supplied CCBs should just be 638 * malloced. 639 */ 640 if ((inccb->ccb_h.func_code & XPT_FC_QUEUED) 641 && ((inccb->ccb_h.func_code & XPT_FC_USER_CCB) == 0)) { 642 ccb = cam_periph_getccb(periph, priority); 643 ccb_malloced = 0; 644 } else { 645 ccb = xpt_alloc_ccb_nowait(); 646 647 if (ccb != NULL) 648 xpt_setup_ccb(&ccb->ccb_h, periph->path, 649 priority); 650 ccb_malloced = 1; 651 } 652 653 if (ccb == NULL) { 654 xpt_print(periph->path, "unable to allocate CCB\n"); 655 error = ENOMEM; 656 break; 657 } 658 659 error = passsendccb(periph, ccb, inccb); 660 661 if (ccb_malloced) 662 xpt_free_ccb(ccb); 663 else 664 xpt_release_ccb(ccb); 665 666 break; 667 } 668 default: 669 error = cam_periph_ioctl(periph, cmd, addr, passerror); 670 break; 671 } 672 673 cam_periph_unlock(periph); 674 return(error); 675} 676 677/* 678 * Generally, "ccb" should be the CCB supplied by the kernel. "inccb" 679 * should be the CCB that is copied in from the user. 680 */ 681static int 682passsendccb(struct cam_periph *periph, union ccb *ccb, union ccb *inccb) 683{ 684 struct pass_softc *softc; 685 struct cam_periph_map_info mapinfo; 686 xpt_opcode fc; 687 int error; 688 689 softc = (struct pass_softc *)periph->softc; 690 691 /* 692 * There are some fields in the CCB header that need to be 693 * preserved, the rest we get from the user. 694 */ 695 xpt_merge_ccb(ccb, inccb); 696 697 /* 698 * There's no way for the user to have a completion 699 * function, so we put our own completion function in here. 700 */ 701 ccb->ccb_h.cbfcnp = passdone; 702 703 /* 704 * Let cam_periph_mapmem do a sanity check on the data pointer format. 705 * Even if no data transfer is needed, it's a cheap check and it 706 * simplifies the code. 707 */ 708 fc = ccb->ccb_h.func_code; 709 if ((fc == XPT_SCSI_IO) || (fc == XPT_ATA_IO) || (fc == XPT_SMP_IO) 710 || (fc == XPT_DEV_MATCH) || (fc == XPT_DEV_ADVINFO)) { 711 bzero(&mapinfo, sizeof(mapinfo)); 712 713 /* 714 * cam_periph_mapmem calls into proc and vm functions that can 715 * sleep as well as trigger I/O, so we can't hold the lock. 716 * Dropping it here is reasonably safe. 717 */ 718 cam_periph_unlock(periph); 719 error = cam_periph_mapmem(ccb, &mapinfo); 720 cam_periph_lock(periph); 721 722 /* 723 * cam_periph_mapmem returned an error, we can't continue. 724 * Return the error to the user. 725 */ 726 if (error) 727 return(error); 728 } else 729 /* Ensure that the unmap call later on is a no-op. */ 730 mapinfo.num_bufs_used = 0; 731 732 /* 733 * If the user wants us to perform any error recovery, then honor 734 * that request. Otherwise, it's up to the user to perform any 735 * error recovery. 736 */ 737 cam_periph_runccb(ccb, passerror, /* cam_flags */ CAM_RETRY_SELTO, 738 /* sense_flags */ ((ccb->ccb_h.flags & CAM_PASS_ERR_RECOVER) ? 739 SF_RETRY_UA : SF_NO_RECOVERY) | SF_NO_PRINT, 740 softc->device_stats); 741 742 cam_periph_unmapmem(ccb, &mapinfo); 743 744 ccb->ccb_h.cbfcnp = NULL; 745 ccb->ccb_h.periph_priv = inccb->ccb_h.periph_priv; 746 bcopy(ccb, inccb, sizeof(union ccb)); 747 748 return(0); 749} 750 751static int 752passerror(union ccb *ccb, u_int32_t cam_flags, u_int32_t sense_flags) 753{ 754 struct cam_periph *periph; 755 struct pass_softc *softc; 756 757 periph = xpt_path_periph(ccb->ccb_h.path); 758 softc = (struct pass_softc *)periph->softc; 759 760 return(cam_periph_error(ccb, cam_flags, sense_flags, 761 &softc->saved_ccb)); 762} 763