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FreeBSD/Linux Kernel Cross Reference
sys/cam/scsi/scsi_target.c
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1 /*- 2 * Generic SCSI Target Kernel Mode Driver 3 * 4 * Copyright (c) 2002 Nate Lawson. 5 * Copyright (c) 1998, 1999, 2001, 2002 Justin T. Gibbs. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions, and the following disclaimer, 13 * without modification, immediately at the beginning of the file. 14 * 2. The name of the author may not be used to endorse or promote products 15 * derived from this software without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD: releng/10.0/sys/cam/scsi/scsi_target.c 255120 2013-09-01 13:01:59Z mav $"); 32 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/conf.h> 38 #include <sys/malloc.h> 39 #include <sys/poll.h> 40 #include <sys/vnode.h> 41 #include <sys/lock.h> 42 #include <sys/mutex.h> 43 #include <sys/devicestat.h> 44 #include <sys/proc.h> 45 /* Includes to support callout */ 46 #include <sys/types.h> 47 #include <sys/systm.h> 48 49 #include <cam/cam.h> 50 #include <cam/cam_ccb.h> 51 #include <cam/cam_periph.h> 52 #include <cam/cam_xpt_periph.h> 53 #include <cam/cam_sim.h> 54 #include <cam/scsi/scsi_targetio.h> 55 56 57 /* Transaction information attached to each CCB sent by the user */ 58 struct targ_cmd_descr { 59 struct cam_periph_map_info mapinfo; 60 TAILQ_ENTRY(targ_cmd_descr) tqe; 61 union ccb *user_ccb; 62 int priority; 63 int func_code; 64 }; 65 66 /* Offset into the private CCB area for storing our descriptor */ 67 #define targ_descr periph_priv.entries[1].ptr 68 69 TAILQ_HEAD(descr_queue, targ_cmd_descr); 70 71 typedef enum { 72 TARG_STATE_RESV = 0x00, /* Invalid state */ 73 TARG_STATE_OPENED = 0x01, /* Device opened, softc initialized */ 74 TARG_STATE_LUN_ENABLED = 0x02 /* Device enabled for a path */ 75 } targ_state; 76 77 /* Per-instance device software context */ 78 struct targ_softc { 79 /* CCBs (CTIOs, ATIOs, INOTs) pending on the controller */ 80 struct ccb_queue pending_ccb_queue; 81 82 /* Command descriptors awaiting CTIO resources from the XPT */ 83 struct descr_queue work_queue; 84 85 /* Command descriptors that have been aborted back to the user. */ 86 struct descr_queue abort_queue; 87 88 /* 89 * Queue of CCBs that have been copied out to userland, but our 90 * userland daemon has not yet seen. 91 */ 92 struct ccb_queue user_ccb_queue; 93 94 struct cam_periph *periph; 95 struct cam_path *path; 96 targ_state state; 97 struct selinfo read_select; 98 struct devstat device_stats; 99 }; 100 101 static d_open_t targopen; 102 static d_read_t targread; 103 static d_write_t targwrite; 104 static d_ioctl_t targioctl; 105 static d_poll_t targpoll; 106 static d_kqfilter_t targkqfilter; 107 static void targreadfiltdetach(struct knote *kn); 108 static int targreadfilt(struct knote *kn, long hint); 109 static struct filterops targread_filtops = { 110 .f_isfd = 1, 111 .f_detach = targreadfiltdetach, 112 .f_event = targreadfilt, 113 }; 114 115 static struct cdevsw targ_cdevsw = { 116 .d_version = D_VERSION, 117 .d_flags = D_NEEDGIANT, 118 .d_open = targopen, 119 .d_read = targread, 120 .d_write = targwrite, 121 .d_ioctl = targioctl, 122 .d_poll = targpoll, 123 .d_name = "targ", 124 .d_kqfilter = targkqfilter 125 }; 126 127 static cam_status targendislun(struct cam_path *path, int enable, 128 int grp6_len, int grp7_len); 129 static cam_status targenable(struct targ_softc *softc, 130 struct cam_path *path, 131 int grp6_len, int grp7_len); 132 static cam_status targdisable(struct targ_softc *softc); 133 static periph_ctor_t targctor; 134 static periph_dtor_t targdtor; 135 static periph_start_t targstart; 136 static int targusermerge(struct targ_softc *softc, 137 struct targ_cmd_descr *descr, 138 union ccb *ccb); 139 static int targsendccb(struct targ_softc *softc, union ccb *ccb, 140 struct targ_cmd_descr *descr); 141 static void targdone(struct cam_periph *periph, 142 union ccb *done_ccb); 143 static int targreturnccb(struct targ_softc *softc, 144 union ccb *ccb); 145 static union ccb * targgetccb(struct targ_softc *softc, xpt_opcode type, 146 int priority); 147 static void targfreeccb(struct targ_softc *softc, union ccb *ccb); 148 static struct targ_cmd_descr * 149 targgetdescr(struct targ_softc *softc); 150 static periph_init_t targinit; 151 static void targasync(void *callback_arg, u_int32_t code, 152 struct cam_path *path, void *arg); 153 static void abort_all_pending(struct targ_softc *softc); 154 static void notify_user(struct targ_softc *softc); 155 static int targcamstatus(cam_status status); 156 static size_t targccblen(xpt_opcode func_code); 157 158 static struct periph_driver targdriver = 159 { 160 targinit, "targ", 161 TAILQ_HEAD_INITIALIZER(targdriver.units), /* generation */ 0 162 }; 163 PERIPHDRIVER_DECLARE(targ, targdriver); 164 165 static MALLOC_DEFINE(M_TARG, "TARG", "TARG data"); 166 167 /* Disable LUN if enabled and teardown softc */ 168 static void 169 targcdevdtor(void *data) 170 { 171 struct targ_softc *softc; 172 struct cam_periph *periph; 173 174 softc = data; 175 if (softc->periph == NULL) { 176 printf("%s: destroying non-enabled target\n", __func__); 177 free(softc, M_TARG); 178 return; 179 } 180 181 /* 182 * Acquire a hold on the periph so that it doesn't go away before 183 * we are ready at the end of the function. 184 */ 185 periph = softc->periph; 186 cam_periph_acquire(periph); 187 cam_periph_lock(periph); 188 (void)targdisable(softc); 189 if (softc->periph != NULL) { 190 cam_periph_invalidate(softc->periph); 191 softc->periph = NULL; 192 } 193 cam_periph_unlock(periph); 194 cam_periph_release(periph); 195 free(softc, M_TARG); 196 } 197 198 /* 199 * Create softc and initialize it. There is no locking here because a 200 * periph doesn't get created until an ioctl is issued to do so, and 201 * that can't happen until this method returns. 202 */ 203 static int 204 targopen(struct cdev *dev, int flags, int fmt, struct thread *td) 205 { 206 struct targ_softc *softc; 207 208 /* Allocate its softc, initialize it */ 209 softc = malloc(sizeof(*softc), M_TARG, 210 M_WAITOK | M_ZERO); 211 softc->state = TARG_STATE_OPENED; 212 softc->periph = NULL; 213 softc->path = NULL; 214 215 TAILQ_INIT(&softc->pending_ccb_queue); 216 TAILQ_INIT(&softc->work_queue); 217 TAILQ_INIT(&softc->abort_queue); 218 TAILQ_INIT(&softc->user_ccb_queue); 219 knlist_init_mtx(&softc->read_select.si_note, NULL); 220 221 devfs_set_cdevpriv(softc, targcdevdtor); 222 return (0); 223 } 224 225 /* Enable/disable LUNs, set debugging level */ 226 static int 227 targioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td) 228 { 229 struct targ_softc *softc; 230 cam_status status; 231 232 devfs_get_cdevpriv((void **)&softc); 233 234 switch (cmd) { 235 case TARGIOCENABLE: 236 { 237 struct ioc_enable_lun *new_lun; 238 struct cam_path *path; 239 struct cam_sim *sim; 240 241 new_lun = (struct ioc_enable_lun *)addr; 242 status = xpt_create_path_unlocked(&path, /*periph*/NULL, 243 new_lun->path_id, 244 new_lun->target_id, 245 new_lun->lun_id); 246 if (status != CAM_REQ_CMP) { 247 printf("Couldn't create path, status %#x\n", status); 248 break; 249 } 250 sim = xpt_path_sim(path); 251 mtx_lock(sim->mtx); 252 status = targenable(softc, path, new_lun->grp6_len, 253 new_lun->grp7_len); 254 xpt_free_path(path); 255 mtx_unlock(sim->mtx); 256 break; 257 } 258 case TARGIOCDISABLE: 259 if (softc->periph == NULL) { 260 status = CAM_DEV_NOT_THERE; 261 break; 262 } 263 cam_periph_lock(softc->periph); 264 status = targdisable(softc); 265 cam_periph_unlock(softc->periph); 266 break; 267 case TARGIOCDEBUG: 268 { 269 struct ccb_debug cdbg; 270 271 /* If no periph available, disallow debugging changes */ 272 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) { 273 status = CAM_DEV_NOT_THERE; 274 break; 275 } 276 bzero(&cdbg, sizeof cdbg); 277 if (*((int *)addr) != 0) 278 cdbg.flags = CAM_DEBUG_PERIPH; 279 else 280 cdbg.flags = CAM_DEBUG_NONE; 281 cam_periph_lock(softc->periph); 282 xpt_setup_ccb(&cdbg.ccb_h, softc->path, CAM_PRIORITY_NORMAL); 283 cdbg.ccb_h.func_code = XPT_DEBUG; 284 cdbg.ccb_h.cbfcnp = targdone; 285 286 xpt_action((union ccb *)&cdbg); 287 cam_periph_unlock(softc->periph); 288 status = cdbg.ccb_h.status & CAM_STATUS_MASK; 289 break; 290 } 291 default: 292 status = CAM_PROVIDE_FAIL; 293 break; 294 } 295 296 return (targcamstatus(status)); 297 } 298 299 /* Writes are always ready, reads wait for user_ccb_queue or abort_queue */ 300 static int 301 targpoll(struct cdev *dev, int poll_events, struct thread *td) 302 { 303 struct targ_softc *softc; 304 int revents; 305 306 devfs_get_cdevpriv((void **)&softc); 307 308 /* Poll for write() is always ok. */ 309 revents = poll_events & (POLLOUT | POLLWRNORM); 310 if ((poll_events & (POLLIN | POLLRDNORM)) != 0) { 311 /* Poll for read() depends on user and abort queues. */ 312 cam_periph_lock(softc->periph); 313 if (!TAILQ_EMPTY(&softc->user_ccb_queue) || 314 !TAILQ_EMPTY(&softc->abort_queue)) { 315 revents |= poll_events & (POLLIN | POLLRDNORM); 316 } 317 cam_periph_unlock(softc->periph); 318 /* Only sleep if the user didn't poll for write. */ 319 if (revents == 0) 320 selrecord(td, &softc->read_select); 321 } 322 323 return (revents); 324 } 325 326 static int 327 targkqfilter(struct cdev *dev, struct knote *kn) 328 { 329 struct targ_softc *softc; 330 331 devfs_get_cdevpriv((void **)&softc); 332 kn->kn_hook = (caddr_t)softc; 333 kn->kn_fop = &targread_filtops; 334 knlist_add(&softc->read_select.si_note, kn, 0); 335 return (0); 336 } 337 338 static void 339 targreadfiltdetach(struct knote *kn) 340 { 341 struct targ_softc *softc; 342 343 softc = (struct targ_softc *)kn->kn_hook; 344 knlist_remove(&softc->read_select.si_note, kn, 0); 345 } 346 347 /* Notify the user's kqueue when the user queue or abort queue gets a CCB */ 348 static int 349 targreadfilt(struct knote *kn, long hint) 350 { 351 struct targ_softc *softc; 352 int retval; 353 354 softc = (struct targ_softc *)kn->kn_hook; 355 cam_periph_lock(softc->periph); 356 retval = !TAILQ_EMPTY(&softc->user_ccb_queue) || 357 !TAILQ_EMPTY(&softc->abort_queue); 358 cam_periph_unlock(softc->periph); 359 return (retval); 360 } 361 362 /* Send the HBA the enable/disable message */ 363 static cam_status 364 targendislun(struct cam_path *path, int enable, int grp6_len, int grp7_len) 365 { 366 struct ccb_en_lun en_ccb; 367 cam_status status; 368 369 /* Tell the lun to begin answering selects */ 370 xpt_setup_ccb(&en_ccb.ccb_h, path, CAM_PRIORITY_NORMAL); 371 en_ccb.ccb_h.func_code = XPT_EN_LUN; 372 /* Don't need support for any vendor specific commands */ 373 en_ccb.grp6_len = grp6_len; 374 en_ccb.grp7_len = grp7_len; 375 en_ccb.enable = enable ? 1 : 0; 376 xpt_action((union ccb *)&en_ccb); 377 status = en_ccb.ccb_h.status & CAM_STATUS_MASK; 378 if (status != CAM_REQ_CMP) { 379 xpt_print(path, "%sable lun CCB rejected, status %#x\n", 380 enable ? "en" : "dis", status); 381 } 382 return (status); 383 } 384 385 /* Enable target mode on a LUN, given its path */ 386 static cam_status 387 targenable(struct targ_softc *softc, struct cam_path *path, int grp6_len, 388 int grp7_len) 389 { 390 struct cam_periph *periph; 391 struct ccb_pathinq cpi; 392 cam_status status; 393 394 if ((softc->state & TARG_STATE_LUN_ENABLED) != 0) 395 return (CAM_LUN_ALRDY_ENA); 396 397 /* Make sure SIM supports target mode */ 398 xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NORMAL); 399 cpi.ccb_h.func_code = XPT_PATH_INQ; 400 xpt_action((union ccb *)&cpi); 401 status = cpi.ccb_h.status & CAM_STATUS_MASK; 402 if (status != CAM_REQ_CMP) { 403 printf("pathinq failed, status %#x\n", status); 404 goto enable_fail; 405 } 406 if ((cpi.target_sprt & PIT_PROCESSOR) == 0) { 407 printf("controller does not support target mode\n"); 408 status = CAM_FUNC_NOTAVAIL; 409 goto enable_fail; 410 } 411 412 /* Destroy any periph on our path if it is disabled */ 413 periph = cam_periph_find(path, "targ"); 414 if (periph != NULL) { 415 struct targ_softc *del_softc; 416 417 del_softc = (struct targ_softc *)periph->softc; 418 if ((del_softc->state & TARG_STATE_LUN_ENABLED) == 0) { 419 cam_periph_invalidate(del_softc->periph); 420 del_softc->periph = NULL; 421 } else { 422 printf("Requested path still in use by targ%d\n", 423 periph->unit_number); 424 status = CAM_LUN_ALRDY_ENA; 425 goto enable_fail; 426 } 427 } 428 429 /* Create a periph instance attached to this path */ 430 status = cam_periph_alloc(targctor, NULL, targdtor, targstart, 431 "targ", CAM_PERIPH_BIO, path, targasync, 0, softc); 432 if (status != CAM_REQ_CMP) { 433 printf("cam_periph_alloc failed, status %#x\n", status); 434 goto enable_fail; 435 } 436 437 /* Ensure that the periph now exists. */ 438 if (cam_periph_find(path, "targ") == NULL) { 439 panic("targenable: succeeded but no periph?"); 440 /* NOTREACHED */ 441 } 442 443 /* Send the enable lun message */ 444 status = targendislun(path, /*enable*/1, grp6_len, grp7_len); 445 if (status != CAM_REQ_CMP) { 446 printf("enable lun failed, status %#x\n", status); 447 goto enable_fail; 448 } 449 softc->state |= TARG_STATE_LUN_ENABLED; 450 451 enable_fail: 452 return (status); 453 } 454 455 /* Disable this softc's target instance if enabled */ 456 static cam_status 457 targdisable(struct targ_softc *softc) 458 { 459 cam_status status; 460 461 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) 462 return (CAM_REQ_CMP); 463 464 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targdisable\n")); 465 466 /* Abort any ccbs pending on the controller */ 467 abort_all_pending(softc); 468 469 /* Disable this lun */ 470 status = targendislun(softc->path, /*enable*/0, 471 /*grp6_len*/0, /*grp7_len*/0); 472 if (status == CAM_REQ_CMP) 473 softc->state &= ~TARG_STATE_LUN_ENABLED; 474 else 475 printf("Disable lun failed, status %#x\n", status); 476 477 return (status); 478 } 479 480 /* Initialize a periph (called from cam_periph_alloc) */ 481 static cam_status 482 targctor(struct cam_periph *periph, void *arg) 483 { 484 struct targ_softc *softc; 485 486 /* Store pointer to softc for periph-driven routines */ 487 softc = (struct targ_softc *)arg; 488 periph->softc = softc; 489 softc->periph = periph; 490 softc->path = periph->path; 491 return (CAM_REQ_CMP); 492 } 493 494 static void 495 targdtor(struct cam_periph *periph) 496 { 497 struct targ_softc *softc; 498 struct ccb_hdr *ccb_h; 499 struct targ_cmd_descr *descr; 500 501 softc = (struct targ_softc *)periph->softc; 502 503 /* 504 * targdisable() aborts CCBs back to the user and leaves them 505 * on user_ccb_queue and abort_queue in case the user is still 506 * interested in them. We free them now. 507 */ 508 while ((ccb_h = TAILQ_FIRST(&softc->user_ccb_queue)) != NULL) { 509 TAILQ_REMOVE(&softc->user_ccb_queue, ccb_h, periph_links.tqe); 510 targfreeccb(softc, (union ccb *)ccb_h); 511 } 512 while ((descr = TAILQ_FIRST(&softc->abort_queue)) != NULL) { 513 TAILQ_REMOVE(&softc->abort_queue, descr, tqe); 514 free(descr, M_TARG); 515 } 516 517 softc->periph = NULL; 518 softc->path = NULL; 519 periph->softc = NULL; 520 } 521 522 /* Receive CCBs from user mode proc and send them to the HBA */ 523 static int 524 targwrite(struct cdev *dev, struct uio *uio, int ioflag) 525 { 526 union ccb *user_ccb; 527 struct targ_softc *softc; 528 struct targ_cmd_descr *descr; 529 int write_len, error; 530 int func_code, priority; 531 532 devfs_get_cdevpriv((void **)&softc); 533 write_len = error = 0; 534 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 535 ("write - uio_resid %zd\n", uio->uio_resid)); 536 while (uio->uio_resid >= sizeof(user_ccb) && error == 0) { 537 union ccb *ccb; 538 539 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio); 540 if (error != 0) { 541 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 542 ("write - uiomove failed (%d)\n", error)); 543 break; 544 } 545 priority = fuword32(&user_ccb->ccb_h.pinfo.priority); 546 if (priority == CAM_PRIORITY_NONE) { 547 error = EINVAL; 548 break; 549 } 550 func_code = fuword32(&user_ccb->ccb_h.func_code); 551 switch (func_code) { 552 case XPT_ACCEPT_TARGET_IO: 553 case XPT_IMMED_NOTIFY: 554 case XPT_IMMEDIATE_NOTIFY: 555 cam_periph_lock(softc->periph); 556 ccb = targgetccb(softc, func_code, priority); 557 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr; 558 descr->user_ccb = user_ccb; 559 descr->func_code = func_code; 560 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 561 ("Sent ATIO/INOT (%p)\n", user_ccb)); 562 xpt_action(ccb); 563 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, 564 &ccb->ccb_h, 565 periph_links.tqe); 566 cam_periph_unlock(softc->periph); 567 break; 568 default: 569 cam_periph_lock(softc->periph); 570 if ((func_code & XPT_FC_QUEUED) != 0) { 571 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 572 ("Sending queued ccb %#x (%p)\n", 573 func_code, user_ccb)); 574 descr = targgetdescr(softc); 575 descr->user_ccb = user_ccb; 576 descr->priority = priority; 577 descr->func_code = func_code; 578 TAILQ_INSERT_TAIL(&softc->work_queue, 579 descr, tqe); 580 xpt_schedule(softc->periph, priority); 581 } else { 582 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 583 ("Sending inline ccb %#x (%p)\n", 584 func_code, user_ccb)); 585 ccb = targgetccb(softc, func_code, priority); 586 descr = (struct targ_cmd_descr *) 587 ccb->ccb_h.targ_descr; 588 descr->user_ccb = user_ccb; 589 descr->priority = priority; 590 descr->func_code = func_code; 591 if (targusermerge(softc, descr, ccb) != EFAULT) 592 targsendccb(softc, ccb, descr); 593 targreturnccb(softc, ccb); 594 } 595 cam_periph_unlock(softc->periph); 596 break; 597 } 598 write_len += sizeof(user_ccb); 599 } 600 601 /* 602 * If we've successfully taken in some amount of 603 * data, return success for that data first. If 604 * an error is persistent, it will be reported 605 * on the next write. 606 */ 607 if (error != 0 && write_len == 0) 608 return (error); 609 if (write_len == 0 && uio->uio_resid != 0) 610 return (ENOSPC); 611 return (0); 612 } 613 614 /* Process requests (descrs) via the periph-supplied CCBs */ 615 static void 616 targstart(struct cam_periph *periph, union ccb *start_ccb) 617 { 618 struct targ_softc *softc; 619 struct targ_cmd_descr *descr, *next_descr; 620 int error; 621 622 softc = (struct targ_softc *)periph->softc; 623 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targstart %p\n", start_ccb)); 624 625 descr = TAILQ_FIRST(&softc->work_queue); 626 if (descr == NULL) { 627 xpt_release_ccb(start_ccb); 628 } else { 629 TAILQ_REMOVE(&softc->work_queue, descr, tqe); 630 next_descr = TAILQ_FIRST(&softc->work_queue); 631 632 /* Initiate a transaction using the descr and supplied CCB */ 633 error = targusermerge(softc, descr, start_ccb); 634 if (error == 0) 635 error = targsendccb(softc, start_ccb, descr); 636 if (error != 0) { 637 xpt_print(periph->path, 638 "targsendccb failed, err %d\n", error); 639 xpt_release_ccb(start_ccb); 640 suword(&descr->user_ccb->ccb_h.status, 641 CAM_REQ_CMP_ERR); 642 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe); 643 notify_user(softc); 644 } 645 646 /* If we have more work to do, stay scheduled */ 647 if (next_descr != NULL) 648 xpt_schedule(periph, next_descr->priority); 649 } 650 } 651 652 static int 653 targusermerge(struct targ_softc *softc, struct targ_cmd_descr *descr, 654 union ccb *ccb) 655 { 656 struct ccb_hdr *u_ccbh, *k_ccbh; 657 size_t ccb_len; 658 int error; 659 660 u_ccbh = &descr->user_ccb->ccb_h; 661 k_ccbh = &ccb->ccb_h; 662 663 /* 664 * There are some fields in the CCB header that need to be 665 * preserved, the rest we get from the user ccb. (See xpt_merge_ccb) 666 */ 667 xpt_setup_ccb(k_ccbh, softc->path, descr->priority); 668 k_ccbh->retry_count = fuword32(&u_ccbh->retry_count); 669 k_ccbh->func_code = descr->func_code; 670 k_ccbh->flags = fuword32(&u_ccbh->flags); 671 k_ccbh->timeout = fuword32(&u_ccbh->timeout); 672 ccb_len = targccblen(k_ccbh->func_code) - sizeof(struct ccb_hdr); 673 error = copyin(u_ccbh + 1, k_ccbh + 1, ccb_len); 674 if (error != 0) { 675 k_ccbh->status = CAM_REQ_CMP_ERR; 676 return (error); 677 } 678 679 /* Translate usermode abort_ccb pointer to its kernel counterpart */ 680 if (k_ccbh->func_code == XPT_ABORT) { 681 struct ccb_abort *cab; 682 struct ccb_hdr *ccb_h; 683 684 cab = (struct ccb_abort *)ccb; 685 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue, 686 periph_links.tqe) { 687 struct targ_cmd_descr *ab_descr; 688 689 ab_descr = (struct targ_cmd_descr *)ccb_h->targ_descr; 690 if (ab_descr->user_ccb == cab->abort_ccb) { 691 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 692 ("Changing abort for %p to %p\n", 693 cab->abort_ccb, ccb_h)); 694 cab->abort_ccb = (union ccb *)ccb_h; 695 break; 696 } 697 } 698 /* CCB not found, set appropriate status */ 699 if (ccb_h == NULL) { 700 k_ccbh->status = CAM_PATH_INVALID; 701 error = ESRCH; 702 } 703 } 704 705 return (error); 706 } 707 708 /* Build and send a kernel CCB formed from descr->user_ccb */ 709 static int 710 targsendccb(struct targ_softc *softc, union ccb *ccb, 711 struct targ_cmd_descr *descr) 712 { 713 struct cam_periph_map_info *mapinfo; 714 struct ccb_hdr *ccb_h; 715 int error; 716 717 ccb_h = &ccb->ccb_h; 718 mapinfo = &descr->mapinfo; 719 mapinfo->num_bufs_used = 0; 720 721 /* 722 * There's no way for the user to have a completion 723 * function, so we put our own completion function in here. 724 * We also stash in a reference to our descriptor so targreturnccb() 725 * can find our mapping info. 726 */ 727 ccb_h->cbfcnp = targdone; 728 ccb_h->targ_descr = descr; 729 730 if ((ccb_h->func_code == XPT_CONT_TARGET_IO) || 731 (ccb_h->func_code == XPT_DEV_MATCH)) { 732 733 error = cam_periph_mapmem(ccb, mapinfo); 734 735 /* 736 * cam_periph_mapmem returned an error, we can't continue. 737 * Return the error to the user. 738 */ 739 if (error) { 740 ccb_h->status = CAM_REQ_CMP_ERR; 741 mapinfo->num_bufs_used = 0; 742 return (error); 743 } 744 } 745 746 /* 747 * Once queued on the pending CCB list, this CCB will be protected 748 * by our error recovery handler. 749 */ 750 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("sendccb %p\n", ccb)); 751 if (XPT_FC_IS_QUEUED(ccb)) { 752 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, ccb_h, 753 periph_links.tqe); 754 } 755 xpt_action(ccb); 756 757 return (0); 758 } 759 760 /* Completion routine for CCBs (called at splsoftcam) */ 761 static void 762 targdone(struct cam_periph *periph, union ccb *done_ccb) 763 { 764 struct targ_softc *softc; 765 cam_status status; 766 767 CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("targdone %p\n", done_ccb)); 768 softc = (struct targ_softc *)periph->softc; 769 TAILQ_REMOVE(&softc->pending_ccb_queue, &done_ccb->ccb_h, 770 periph_links.tqe); 771 status = done_ccb->ccb_h.status & CAM_STATUS_MASK; 772 773 /* If we're no longer enabled, throw away CCB */ 774 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) { 775 targfreeccb(softc, done_ccb); 776 return; 777 } 778 /* abort_all_pending() waits for pending queue to be empty */ 779 if (TAILQ_EMPTY(&softc->pending_ccb_queue)) 780 wakeup(&softc->pending_ccb_queue); 781 782 switch (done_ccb->ccb_h.func_code) { 783 /* All FC_*_QUEUED CCBs go back to userland */ 784 case XPT_IMMED_NOTIFY: 785 case XPT_IMMEDIATE_NOTIFY: 786 case XPT_ACCEPT_TARGET_IO: 787 case XPT_CONT_TARGET_IO: 788 TAILQ_INSERT_TAIL(&softc->user_ccb_queue, &done_ccb->ccb_h, 789 periph_links.tqe); 790 cam_periph_unlock(softc->periph); 791 notify_user(softc); 792 cam_periph_lock(softc->periph); 793 break; 794 default: 795 panic("targdone: impossible xpt opcode %#x", 796 done_ccb->ccb_h.func_code); 797 /* NOTREACHED */ 798 } 799 } 800 801 /* Return CCBs to the user from the user queue and abort queue */ 802 static int 803 targread(struct cdev *dev, struct uio *uio, int ioflag) 804 { 805 struct descr_queue *abort_queue; 806 struct targ_cmd_descr *user_descr; 807 struct targ_softc *softc; 808 struct ccb_queue *user_queue; 809 struct ccb_hdr *ccb_h; 810 union ccb *user_ccb; 811 int read_len, error; 812 813 error = 0; 814 read_len = 0; 815 devfs_get_cdevpriv((void **)&softc); 816 user_queue = &softc->user_ccb_queue; 817 abort_queue = &softc->abort_queue; 818 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targread\n")); 819 820 /* If no data is available, wait or return immediately */ 821 cam_periph_lock(softc->periph); 822 ccb_h = TAILQ_FIRST(user_queue); 823 user_descr = TAILQ_FIRST(abort_queue); 824 while (ccb_h == NULL && user_descr == NULL) { 825 if ((ioflag & IO_NDELAY) == 0) { 826 error = msleep(user_queue, softc->periph->sim->mtx, 827 PRIBIO | PCATCH, "targrd", 0); 828 ccb_h = TAILQ_FIRST(user_queue); 829 user_descr = TAILQ_FIRST(abort_queue); 830 if (error != 0) { 831 if (error == ERESTART) { 832 continue; 833 } else { 834 goto read_fail; 835 } 836 } 837 } else { 838 cam_periph_unlock(softc->periph); 839 return (EAGAIN); 840 } 841 } 842 843 /* Data is available so fill the user's buffer */ 844 while (ccb_h != NULL) { 845 struct targ_cmd_descr *descr; 846 847 if (uio->uio_resid < sizeof(user_ccb)) 848 break; 849 TAILQ_REMOVE(user_queue, ccb_h, periph_links.tqe); 850 descr = (struct targ_cmd_descr *)ccb_h->targ_descr; 851 user_ccb = descr->user_ccb; 852 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 853 ("targread ccb %p (%p)\n", ccb_h, user_ccb)); 854 error = targreturnccb(softc, (union ccb *)ccb_h); 855 if (error != 0) 856 goto read_fail; 857 cam_periph_unlock(softc->periph); 858 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio); 859 cam_periph_lock(softc->periph); 860 if (error != 0) 861 goto read_fail; 862 read_len += sizeof(user_ccb); 863 864 ccb_h = TAILQ_FIRST(user_queue); 865 } 866 867 /* Flush out any aborted descriptors */ 868 while (user_descr != NULL) { 869 if (uio->uio_resid < sizeof(user_ccb)) 870 break; 871 TAILQ_REMOVE(abort_queue, user_descr, tqe); 872 user_ccb = user_descr->user_ccb; 873 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 874 ("targread aborted descr %p (%p)\n", 875 user_descr, user_ccb)); 876 suword(&user_ccb->ccb_h.status, CAM_REQ_ABORTED); 877 cam_periph_unlock(softc->periph); 878 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio); 879 cam_periph_lock(softc->periph); 880 if (error != 0) 881 goto read_fail; 882 read_len += sizeof(user_ccb); 883 884 user_descr = TAILQ_FIRST(abort_queue); 885 } 886 887 /* 888 * If we've successfully read some amount of data, don't report an 889 * error. If the error is persistent, it will be reported on the 890 * next read(). 891 */ 892 if (read_len == 0 && uio->uio_resid != 0) 893 error = ENOSPC; 894 895 read_fail: 896 cam_periph_unlock(softc->periph); 897 return (error); 898 } 899 900 /* Copy completed ccb back to the user */ 901 static int 902 targreturnccb(struct targ_softc *softc, union ccb *ccb) 903 { 904 struct targ_cmd_descr *descr; 905 struct ccb_hdr *u_ccbh; 906 size_t ccb_len; 907 int error; 908 909 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targreturnccb %p\n", ccb)); 910 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr; 911 u_ccbh = &descr->user_ccb->ccb_h; 912 913 /* Copy out the central portion of the ccb_hdr */ 914 copyout(&ccb->ccb_h.retry_count, &u_ccbh->retry_count, 915 offsetof(struct ccb_hdr, periph_priv) - 916 offsetof(struct ccb_hdr, retry_count)); 917 918 /* Copy out the rest of the ccb (after the ccb_hdr) */ 919 ccb_len = targccblen(ccb->ccb_h.func_code) - sizeof(struct ccb_hdr); 920 if (descr->mapinfo.num_bufs_used != 0) 921 cam_periph_unmapmem(ccb, &descr->mapinfo); 922 error = copyout(&ccb->ccb_h + 1, u_ccbh + 1, ccb_len); 923 if (error != 0) { 924 xpt_print(softc->path, 925 "targreturnccb - CCB copyout failed (%d)\n", error); 926 } 927 /* Free CCB or send back to devq. */ 928 targfreeccb(softc, ccb); 929 930 return (error); 931 } 932 933 static union ccb * 934 targgetccb(struct targ_softc *softc, xpt_opcode type, int priority) 935 { 936 union ccb *ccb; 937 int ccb_len; 938 939 ccb_len = targccblen(type); 940 ccb = malloc(ccb_len, M_TARG, M_NOWAIT); 941 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("getccb %p\n", ccb)); 942 if (ccb == NULL) { 943 return (ccb); 944 } 945 xpt_setup_ccb(&ccb->ccb_h, softc->path, priority); 946 ccb->ccb_h.func_code = type; 947 ccb->ccb_h.cbfcnp = targdone; 948 ccb->ccb_h.targ_descr = targgetdescr(softc); 949 if (ccb->ccb_h.targ_descr == NULL) { 950 free (ccb, M_TARG); 951 ccb = NULL; 952 } 953 return (ccb); 954 } 955 956 static void 957 targfreeccb(struct targ_softc *softc, union ccb *ccb) 958 { 959 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("targfreeccb descr %p and\n", 960 ccb->ccb_h.targ_descr)); 961 free(ccb->ccb_h.targ_descr, M_TARG); 962 963 switch (ccb->ccb_h.func_code) { 964 case XPT_ACCEPT_TARGET_IO: 965 case XPT_IMMED_NOTIFY: 966 case XPT_IMMEDIATE_NOTIFY: 967 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("freeing ccb %p\n", ccb)); 968 free(ccb, M_TARG); 969 break; 970 default: 971 /* Send back CCB if we got it from the periph */ 972 if (XPT_FC_IS_QUEUED(ccb)) { 973 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, 974 ("returning queued ccb %p\n", ccb)); 975 xpt_release_ccb(ccb); 976 } else { 977 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, 978 ("freeing ccb %p\n", ccb)); 979 free(ccb, M_TARG); 980 } 981 break; 982 } 983 } 984 985 static struct targ_cmd_descr * 986 targgetdescr(struct targ_softc *softc) 987 { 988 struct targ_cmd_descr *descr; 989 990 descr = malloc(sizeof(*descr), M_TARG, 991 M_NOWAIT); 992 if (descr) { 993 descr->mapinfo.num_bufs_used = 0; 994 } 995 return (descr); 996 } 997 998 static void 999 targinit(void) 1000 { 1001 struct cdev *dev; 1002 1003 /* Add symbolic link to targ0 for compatibility. */ 1004 dev = make_dev(&targ_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "targ"); 1005 make_dev_alias(dev, "targ0"); 1006 } 1007 1008 static void 1009 targasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg) 1010 { 1011 /* All events are handled in usermode by INOTs */ 1012 panic("targasync() called, should be an INOT instead"); 1013 } 1014 1015 /* Cancel all pending requests and CCBs awaiting work. */ 1016 static void 1017 abort_all_pending(struct targ_softc *softc) 1018 { 1019 struct targ_cmd_descr *descr; 1020 struct ccb_abort cab; 1021 struct ccb_hdr *ccb_h; 1022 struct cam_sim *sim; 1023 1024 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("abort_all_pending\n")); 1025 1026 /* First abort the descriptors awaiting resources */ 1027 while ((descr = TAILQ_FIRST(&softc->work_queue)) != NULL) { 1028 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 1029 ("Aborting descr from workq %p\n", descr)); 1030 TAILQ_REMOVE(&softc->work_queue, descr, tqe); 1031 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe); 1032 } 1033 1034 /* 1035 * Then abort all pending CCBs. 1036 * targdone() will return the aborted CCB via user_ccb_queue 1037 */ 1038 xpt_setup_ccb(&cab.ccb_h, softc->path, CAM_PRIORITY_NORMAL); 1039 cab.ccb_h.func_code = XPT_ABORT; 1040 cab.ccb_h.status = CAM_REQ_CMP_ERR; 1041 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue, periph_links.tqe) { 1042 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 1043 ("Aborting pending CCB %p\n", ccb_h)); 1044 cab.abort_ccb = (union ccb *)ccb_h; 1045 xpt_action((union ccb *)&cab); 1046 if (cab.ccb_h.status != CAM_REQ_CMP) { 1047 xpt_print(cab.ccb_h.path, 1048 "Unable to abort CCB, status %#x\n", 1049 cab.ccb_h.status); 1050 } 1051 } 1052 1053 /* If we aborted at least one pending CCB ok, wait for it. */ 1054 if (cab.ccb_h.status == CAM_REQ_CMP) { 1055 sim = xpt_path_sim(softc->path); 1056 msleep(&softc->pending_ccb_queue, sim->mtx, 1057 PRIBIO | PCATCH, "tgabrt", 0); 1058 } 1059 1060 /* If we aborted anything from the work queue, wakeup user. */ 1061 if (!TAILQ_EMPTY(&softc->user_ccb_queue) 1062 || !TAILQ_EMPTY(&softc->abort_queue)) { 1063 cam_periph_unlock(softc->periph); 1064 notify_user(softc); 1065 cam_periph_lock(softc->periph); 1066 } 1067 } 1068 1069 /* Notify the user that data is ready */ 1070 static void 1071 notify_user(struct targ_softc *softc) 1072 { 1073 /* 1074 * Notify users sleeping via poll(), kqueue(), and 1075 * blocking read(). 1076 */ 1077 selwakeuppri(&softc->read_select, PRIBIO); 1078 KNOTE_UNLOCKED(&softc->read_select.si_note, 0); 1079 wakeup(&softc->user_ccb_queue); 1080 } 1081 1082 /* Convert CAM status to errno values */ 1083 static int 1084 targcamstatus(cam_status status) 1085 { 1086 switch (status & CAM_STATUS_MASK) { 1087 case CAM_REQ_CMP: /* CCB request completed without error */ 1088 return (0); 1089 case CAM_REQ_INPROG: /* CCB request is in progress */ 1090 return (EINPROGRESS); 1091 case CAM_REQ_CMP_ERR: /* CCB request completed with an error */ 1092 return (EIO); 1093 case CAM_PROVIDE_FAIL: /* Unable to provide requested capability */ 1094 return (ENOTTY); 1095 case CAM_FUNC_NOTAVAIL: /* The requested function is not available */ 1096 return (ENOTSUP); 1097 case CAM_LUN_ALRDY_ENA: /* LUN is already enabled for target mode */ 1098 return (EADDRINUSE); 1099 case CAM_PATH_INVALID: /* Supplied Path ID is invalid */ 1100 case CAM_DEV_NOT_THERE: /* SCSI Device Not Installed/there */ 1101 return (ENOENT); 1102 case CAM_REQ_ABORTED: /* CCB request aborted by the host */ 1103 return (ECANCELED); 1104 case CAM_CMD_TIMEOUT: /* Command timeout */ 1105 return (ETIMEDOUT); 1106 case CAM_REQUEUE_REQ: /* Requeue to preserve transaction ordering */ 1107 return (EAGAIN); 1108 case CAM_REQ_INVALID: /* CCB request was invalid */ 1109 return (EINVAL); 1110 case CAM_RESRC_UNAVAIL: /* Resource Unavailable */ 1111 return (ENOMEM); 1112 case CAM_BUSY: /* CAM subsystem is busy */ 1113 case CAM_UA_ABORT: /* Unable to abort CCB request */ 1114 return (EBUSY); 1115 default: 1116 return (ENXIO); 1117 } 1118 } 1119 1120 static size_t 1121 targccblen(xpt_opcode func_code) 1122 { 1123 int len; 1124 1125 /* Codes we expect to see as a target */ 1126 switch (func_code) { 1127 case XPT_CONT_TARGET_IO: 1128 case XPT_SCSI_IO: 1129 len = sizeof(struct ccb_scsiio); 1130 break; 1131 case XPT_ACCEPT_TARGET_IO: 1132 len = sizeof(struct ccb_accept_tio); 1133 break; 1134 case XPT_IMMED_NOTIFY: 1135 len = sizeof(struct ccb_immed_notify); 1136 break; 1137 case XPT_IMMEDIATE_NOTIFY: 1138 len = sizeof(struct ccb_immediate_notify); 1139 break; 1140 case XPT_REL_SIMQ: 1141 len = sizeof(struct ccb_relsim); 1142 break; 1143 case XPT_PATH_INQ: 1144 len = sizeof(struct ccb_pathinq); 1145 break; 1146 case XPT_DEBUG: 1147 len = sizeof(struct ccb_debug); 1148 break; 1149 case XPT_ABORT: 1150 len = sizeof(struct ccb_abort); 1151 break; 1152 case XPT_EN_LUN: 1153 len = sizeof(struct ccb_en_lun); 1154 break; 1155 default: 1156 len = sizeof(union ccb); 1157 break; 1158 } 1159 1160 return (len); 1161 }
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