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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/8.3/sys/cam/scsi/scsi_target.c 224070 2011-07-15 21:30:50Z mjacob $"); 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 struct callout destroy_dev_callout; 100 struct mtx destroy_mtx; 101 }; 102 103 static d_open_t targopen; 104 static d_close_t targclose; 105 static d_read_t targread; 106 static d_write_t targwrite; 107 static d_ioctl_t targioctl; 108 static d_poll_t targpoll; 109 static d_kqfilter_t targkqfilter; 110 static void targreadfiltdetach(struct knote *kn); 111 static int targreadfilt(struct knote *kn, long hint); 112 static struct filterops targread_filtops = 113 { 1, NULL, targreadfiltdetach, targreadfilt }; 114 115 static struct cdevsw targ_cdevsw = { 116 .d_version = D_VERSION, 117 .d_flags = D_NEEDGIANT, 118 .d_open = targopen, 119 .d_close = targclose, 120 .d_read = targread, 121 .d_write = targwrite, 122 .d_ioctl = targioctl, 123 .d_poll = targpoll, 124 .d_name = "targ", 125 .d_kqfilter = targkqfilter 126 }; 127 128 static cam_status targendislun(struct cam_path *path, int enable, 129 int grp6_len, int grp7_len); 130 static cam_status targenable(struct targ_softc *softc, 131 struct cam_path *path, 132 int grp6_len, int grp7_len); 133 static cam_status targdisable(struct targ_softc *softc); 134 static periph_ctor_t targctor; 135 static periph_dtor_t targdtor; 136 static periph_start_t targstart; 137 static int targusermerge(struct targ_softc *softc, 138 struct targ_cmd_descr *descr, 139 union ccb *ccb); 140 static int targsendccb(struct targ_softc *softc, union ccb *ccb, 141 struct targ_cmd_descr *descr); 142 static void targdone(struct cam_periph *periph, 143 union ccb *done_ccb); 144 static int targreturnccb(struct targ_softc *softc, 145 union ccb *ccb); 146 static union ccb * targgetccb(struct targ_softc *softc, xpt_opcode type, 147 int priority); 148 static void targfreeccb(struct targ_softc *softc, union ccb *ccb); 149 static struct targ_cmd_descr * 150 targgetdescr(struct targ_softc *softc); 151 static periph_init_t targinit; 152 static void targclone(void *arg, struct ucred *cred, char *name, 153 int namelen, struct cdev **dev); 154 static void targasync(void *callback_arg, u_int32_t code, 155 struct cam_path *path, void *arg); 156 static void abort_all_pending(struct targ_softc *softc); 157 static void notify_user(struct targ_softc *softc); 158 static int targcamstatus(cam_status status); 159 static size_t targccblen(xpt_opcode func_code); 160 static void targdestroy(void *); 161 162 static struct periph_driver targdriver = 163 { 164 targinit, "targ", 165 TAILQ_HEAD_INITIALIZER(targdriver.units), /* generation */ 0 166 }; 167 PERIPHDRIVER_DECLARE(targ, targdriver); 168 169 static MALLOC_DEFINE(M_TARG, "TARG", "TARG data"); 170 171 /* 172 * Create softc and initialize it. Only one proc can open each targ device. 173 * There is no locking here because a periph doesn't get created until an 174 * ioctl is issued to do so, and that can't happen until this method returns. 175 */ 176 static int 177 targopen(struct cdev *dev, int flags, int fmt, struct thread *td) 178 { 179 struct targ_softc *softc; 180 181 if (dev->si_drv1 != 0) { 182 return (EBUSY); 183 } 184 185 /* Mark device busy before any potentially blocking operations */ 186 dev->si_drv1 = (void *)~0; 187 188 /* Create the targ device, allocate its softc, initialize it */ 189 if ((dev->si_flags & SI_NAMED) == 0) { 190 make_dev(&targ_cdevsw, dev2unit(dev), UID_ROOT, GID_WHEEL, 0600, 191 "targ%d", dev2unit(dev)); 192 } 193 softc = malloc(sizeof(*softc), M_TARG, 194 M_WAITOK | M_ZERO); 195 dev->si_drv1 = softc; 196 softc->state = TARG_STATE_OPENED; 197 softc->periph = NULL; 198 softc->path = NULL; 199 200 TAILQ_INIT(&softc->pending_ccb_queue); 201 TAILQ_INIT(&softc->work_queue); 202 TAILQ_INIT(&softc->abort_queue); 203 TAILQ_INIT(&softc->user_ccb_queue); 204 knlist_init_mtx(&softc->read_select.si_note, NULL); 205 206 return (0); 207 } 208 209 /* Disable LUN if enabled and teardown softc */ 210 static int 211 targclose(struct cdev *dev, int flag, int fmt, struct thread *td) 212 { 213 struct targ_softc *softc; 214 struct cam_periph *periph; 215 int error; 216 217 softc = (struct targ_softc *)dev->si_drv1; 218 mtx_init(&softc->destroy_mtx, "targ_destroy", "SCSI Target dev destroy", MTX_DEF); 219 callout_init_mtx(&softc->destroy_dev_callout, &softc->destroy_mtx, CALLOUT_RETURNUNLOCKED); 220 if (softc->periph == NULL) { 221 #if 0 222 destroy_dev(dev); 223 free(softc, M_TARG); 224 #endif 225 printf("%s: destroying non-enabled target\n", __func__); 226 mtx_lock(&softc->destroy_mtx); 227 callout_reset(&softc->destroy_dev_callout, hz / 2, 228 (void *)targdestroy, (void *)dev); 229 mtx_unlock(&softc->destroy_mtx); 230 return (0); 231 } 232 233 /* 234 * Acquire a hold on the periph so that it doesn't go away before 235 * we are ready at the end of the function. 236 */ 237 periph = softc->periph; 238 cam_periph_acquire(periph); 239 cam_periph_lock(periph); 240 error = targdisable(softc); 241 if (softc->periph != NULL) { 242 cam_periph_invalidate(softc->periph); 243 softc->periph = NULL; 244 } 245 cam_periph_unlock(periph); 246 cam_periph_release(periph); 247 248 #if 0 249 destroy_dev(dev); 250 free(softc, M_TARG); 251 #endif 252 253 printf("%s: close finished error(%d)\n", __func__, error); 254 mtx_lock(&softc->destroy_mtx); 255 callout_reset(&softc->destroy_dev_callout, hz / 2, 256 (void *)targdestroy, (void *)dev); 257 mtx_unlock(&softc->destroy_mtx); 258 return (error); 259 } 260 261 /* Enable/disable LUNs, set debugging level */ 262 static int 263 targioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *td) 264 { 265 struct targ_softc *softc; 266 cam_status status; 267 268 softc = (struct targ_softc *)dev->si_drv1; 269 270 switch (cmd) { 271 case TARGIOCENABLE: 272 { 273 struct ioc_enable_lun *new_lun; 274 struct cam_path *path; 275 struct cam_sim *sim; 276 277 new_lun = (struct ioc_enable_lun *)addr; 278 status = xpt_create_path_unlocked(&path, /*periph*/NULL, 279 new_lun->path_id, 280 new_lun->target_id, 281 new_lun->lun_id); 282 if (status != CAM_REQ_CMP) { 283 printf("Couldn't create path, status %#x\n", status); 284 break; 285 } 286 sim = xpt_path_sim(path); 287 mtx_lock(sim->mtx); 288 status = targenable(softc, path, new_lun->grp6_len, 289 new_lun->grp7_len); 290 xpt_free_path(path); 291 mtx_unlock(sim->mtx); 292 break; 293 } 294 case TARGIOCDISABLE: 295 if (softc->periph == NULL) { 296 status = CAM_DEV_NOT_THERE; 297 break; 298 } 299 cam_periph_lock(softc->periph); 300 status = targdisable(softc); 301 cam_periph_unlock(softc->periph); 302 break; 303 case TARGIOCDEBUG: 304 { 305 #ifdef CAMDEBUG 306 struct ccb_debug cdbg; 307 308 /* If no periph available, disallow debugging changes */ 309 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) { 310 status = CAM_DEV_NOT_THERE; 311 break; 312 } 313 bzero(&cdbg, sizeof cdbg); 314 if (*((int *)addr) != 0) 315 cdbg.flags = CAM_DEBUG_PERIPH; 316 else 317 cdbg.flags = CAM_DEBUG_NONE; 318 cam_periph_lock(softc->periph); 319 xpt_setup_ccb(&cdbg.ccb_h, softc->path, CAM_PRIORITY_NORMAL); 320 cdbg.ccb_h.func_code = XPT_DEBUG; 321 cdbg.ccb_h.cbfcnp = targdone; 322 323 xpt_action((union ccb *)&cdbg); 324 cam_periph_unlock(softc->periph); 325 status = cdbg.ccb_h.status & CAM_STATUS_MASK; 326 #else 327 status = CAM_FUNC_NOTAVAIL; 328 #endif 329 break; 330 } 331 default: 332 status = CAM_PROVIDE_FAIL; 333 break; 334 } 335 336 return (targcamstatus(status)); 337 } 338 339 /* Writes are always ready, reads wait for user_ccb_queue or abort_queue */ 340 static int 341 targpoll(struct cdev *dev, int poll_events, struct thread *td) 342 { 343 struct targ_softc *softc; 344 int revents; 345 346 softc = (struct targ_softc *)dev->si_drv1; 347 348 /* Poll for write() is always ok. */ 349 revents = poll_events & (POLLOUT | POLLWRNORM); 350 if ((poll_events & (POLLIN | POLLRDNORM)) != 0) { 351 /* Poll for read() depends on user and abort queues. */ 352 cam_periph_lock(softc->periph); 353 if (!TAILQ_EMPTY(&softc->user_ccb_queue) || 354 !TAILQ_EMPTY(&softc->abort_queue)) { 355 revents |= poll_events & (POLLIN | POLLRDNORM); 356 } 357 cam_periph_unlock(softc->periph); 358 /* Only sleep if the user didn't poll for write. */ 359 if (revents == 0) 360 selrecord(td, &softc->read_select); 361 } 362 363 return (revents); 364 } 365 366 static int 367 targkqfilter(struct cdev *dev, struct knote *kn) 368 { 369 struct targ_softc *softc; 370 371 softc = (struct targ_softc *)dev->si_drv1; 372 kn->kn_hook = (caddr_t)softc; 373 kn->kn_fop = &targread_filtops; 374 knlist_add(&softc->read_select.si_note, kn, 0); 375 return (0); 376 } 377 378 static void 379 targreadfiltdetach(struct knote *kn) 380 { 381 struct targ_softc *softc; 382 383 softc = (struct targ_softc *)kn->kn_hook; 384 knlist_remove(&softc->read_select.si_note, kn, 0); 385 } 386 387 /* Notify the user's kqueue when the user queue or abort queue gets a CCB */ 388 static int 389 targreadfilt(struct knote *kn, long hint) 390 { 391 struct targ_softc *softc; 392 int retval; 393 394 softc = (struct targ_softc *)kn->kn_hook; 395 cam_periph_lock(softc->periph); 396 retval = !TAILQ_EMPTY(&softc->user_ccb_queue) || 397 !TAILQ_EMPTY(&softc->abort_queue); 398 cam_periph_unlock(softc->periph); 399 return (retval); 400 } 401 402 /* Send the HBA the enable/disable message */ 403 static cam_status 404 targendislun(struct cam_path *path, int enable, int grp6_len, int grp7_len) 405 { 406 struct ccb_en_lun en_ccb; 407 cam_status status; 408 409 /* Tell the lun to begin answering selects */ 410 xpt_setup_ccb(&en_ccb.ccb_h, path, CAM_PRIORITY_NORMAL); 411 en_ccb.ccb_h.func_code = XPT_EN_LUN; 412 /* Don't need support for any vendor specific commands */ 413 en_ccb.grp6_len = grp6_len; 414 en_ccb.grp7_len = grp7_len; 415 en_ccb.enable = enable ? 1 : 0; 416 xpt_action((union ccb *)&en_ccb); 417 status = en_ccb.ccb_h.status & CAM_STATUS_MASK; 418 if (status != CAM_REQ_CMP) { 419 xpt_print(path, "%sable lun CCB rejected, status %#x\n", 420 enable ? "en" : "dis", status); 421 } 422 return (status); 423 } 424 425 /* Enable target mode on a LUN, given its path */ 426 static cam_status 427 targenable(struct targ_softc *softc, struct cam_path *path, int grp6_len, 428 int grp7_len) 429 { 430 struct cam_periph *periph; 431 struct ccb_pathinq cpi; 432 cam_status status; 433 434 if ((softc->state & TARG_STATE_LUN_ENABLED) != 0) 435 return (CAM_LUN_ALRDY_ENA); 436 437 /* Make sure SIM supports target mode */ 438 xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NORMAL); 439 cpi.ccb_h.func_code = XPT_PATH_INQ; 440 xpt_action((union ccb *)&cpi); 441 status = cpi.ccb_h.status & CAM_STATUS_MASK; 442 if (status != CAM_REQ_CMP) { 443 printf("pathinq failed, status %#x\n", status); 444 goto enable_fail; 445 } 446 if ((cpi.target_sprt & PIT_PROCESSOR) == 0) { 447 printf("controller does not support target mode\n"); 448 status = CAM_FUNC_NOTAVAIL; 449 goto enable_fail; 450 } 451 452 /* Destroy any periph on our path if it is disabled */ 453 periph = cam_periph_find(path, "targ"); 454 if (periph != NULL) { 455 struct targ_softc *del_softc; 456 457 del_softc = (struct targ_softc *)periph->softc; 458 if ((del_softc->state & TARG_STATE_LUN_ENABLED) == 0) { 459 cam_periph_invalidate(del_softc->periph); 460 del_softc->periph = NULL; 461 } else { 462 printf("Requested path still in use by targ%d\n", 463 periph->unit_number); 464 status = CAM_LUN_ALRDY_ENA; 465 goto enable_fail; 466 } 467 } 468 469 /* Create a periph instance attached to this path */ 470 status = cam_periph_alloc(targctor, NULL, targdtor, targstart, 471 "targ", CAM_PERIPH_BIO, path, targasync, 0, softc); 472 if (status != CAM_REQ_CMP) { 473 printf("cam_periph_alloc failed, status %#x\n", status); 474 goto enable_fail; 475 } 476 477 /* Ensure that the periph now exists. */ 478 if (cam_periph_find(path, "targ") == NULL) { 479 panic("targenable: succeeded but no periph?"); 480 /* NOTREACHED */ 481 } 482 483 /* Send the enable lun message */ 484 status = targendislun(path, /*enable*/1, grp6_len, grp7_len); 485 if (status != CAM_REQ_CMP) { 486 printf("enable lun failed, status %#x\n", status); 487 goto enable_fail; 488 } 489 softc->state |= TARG_STATE_LUN_ENABLED; 490 491 enable_fail: 492 return (status); 493 } 494 495 /* Disable this softc's target instance if enabled */ 496 static cam_status 497 targdisable(struct targ_softc *softc) 498 { 499 cam_status status; 500 501 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) 502 return (CAM_REQ_CMP); 503 504 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targdisable\n")); 505 506 /* Abort any ccbs pending on the controller */ 507 abort_all_pending(softc); 508 509 /* Disable this lun */ 510 status = targendislun(softc->path, /*enable*/0, 511 /*grp6_len*/0, /*grp7_len*/0); 512 if (status == CAM_REQ_CMP) 513 softc->state &= ~TARG_STATE_LUN_ENABLED; 514 else 515 printf("Disable lun failed, status %#x\n", status); 516 517 return (status); 518 } 519 520 /* Initialize a periph (called from cam_periph_alloc) */ 521 static cam_status 522 targctor(struct cam_periph *periph, void *arg) 523 { 524 struct targ_softc *softc; 525 526 /* Store pointer to softc for periph-driven routines */ 527 softc = (struct targ_softc *)arg; 528 periph->softc = softc; 529 softc->periph = periph; 530 softc->path = periph->path; 531 return (CAM_REQ_CMP); 532 } 533 534 static void 535 targdtor(struct cam_periph *periph) 536 { 537 struct targ_softc *softc; 538 struct ccb_hdr *ccb_h; 539 struct targ_cmd_descr *descr; 540 541 softc = (struct targ_softc *)periph->softc; 542 543 /* 544 * targdisable() aborts CCBs back to the user and leaves them 545 * on user_ccb_queue and abort_queue in case the user is still 546 * interested in them. We free them now. 547 */ 548 while ((ccb_h = TAILQ_FIRST(&softc->user_ccb_queue)) != NULL) { 549 TAILQ_REMOVE(&softc->user_ccb_queue, ccb_h, periph_links.tqe); 550 targfreeccb(softc, (union ccb *)ccb_h); 551 } 552 while ((descr = TAILQ_FIRST(&softc->abort_queue)) != NULL) { 553 TAILQ_REMOVE(&softc->abort_queue, descr, tqe); 554 free(descr, M_TARG); 555 } 556 557 softc->periph = NULL; 558 softc->path = NULL; 559 periph->softc = NULL; 560 } 561 562 /* Receive CCBs from user mode proc and send them to the HBA */ 563 static int 564 targwrite(struct cdev *dev, struct uio *uio, int ioflag) 565 { 566 union ccb *user_ccb; 567 struct targ_softc *softc; 568 struct targ_cmd_descr *descr; 569 int write_len, error; 570 int func_code, priority; 571 572 softc = (struct targ_softc *)dev->si_drv1; 573 write_len = error = 0; 574 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 575 ("write - uio_resid %zd\n", uio->uio_resid)); 576 while (uio->uio_resid >= sizeof(user_ccb) && error == 0) { 577 union ccb *ccb; 578 579 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio); 580 if (error != 0) { 581 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 582 ("write - uiomove failed (%d)\n", error)); 583 break; 584 } 585 priority = fuword32(&user_ccb->ccb_h.pinfo.priority); 586 if (priority == CAM_PRIORITY_NONE) { 587 error = EINVAL; 588 break; 589 } 590 func_code = fuword32(&user_ccb->ccb_h.func_code); 591 switch (func_code) { 592 case XPT_ACCEPT_TARGET_IO: 593 case XPT_IMMED_NOTIFY: 594 cam_periph_lock(softc->periph); 595 ccb = targgetccb(softc, func_code, priority); 596 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr; 597 descr->user_ccb = user_ccb; 598 descr->func_code = func_code; 599 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 600 ("Sent ATIO/INOT (%p)\n", user_ccb)); 601 xpt_action(ccb); 602 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, 603 &ccb->ccb_h, 604 periph_links.tqe); 605 cam_periph_unlock(softc->periph); 606 break; 607 default: 608 cam_periph_lock(softc->periph); 609 if ((func_code & XPT_FC_QUEUED) != 0) { 610 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 611 ("Sending queued ccb %#x (%p)\n", 612 func_code, user_ccb)); 613 descr = targgetdescr(softc); 614 descr->user_ccb = user_ccb; 615 descr->priority = priority; 616 descr->func_code = func_code; 617 TAILQ_INSERT_TAIL(&softc->work_queue, 618 descr, tqe); 619 xpt_schedule(softc->periph, priority); 620 } else { 621 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 622 ("Sending inline ccb %#x (%p)\n", 623 func_code, user_ccb)); 624 ccb = targgetccb(softc, func_code, priority); 625 descr = (struct targ_cmd_descr *) 626 ccb->ccb_h.targ_descr; 627 descr->user_ccb = user_ccb; 628 descr->priority = priority; 629 descr->func_code = func_code; 630 if (targusermerge(softc, descr, ccb) != EFAULT) 631 targsendccb(softc, ccb, descr); 632 targreturnccb(softc, ccb); 633 } 634 cam_periph_unlock(softc->periph); 635 break; 636 } 637 write_len += sizeof(user_ccb); 638 } 639 640 /* 641 * If we've successfully taken in some amount of 642 * data, return success for that data first. If 643 * an error is persistent, it will be reported 644 * on the next write. 645 */ 646 if (error != 0 && write_len == 0) 647 return (error); 648 if (write_len == 0 && uio->uio_resid != 0) 649 return (ENOSPC); 650 return (0); 651 } 652 653 /* Process requests (descrs) via the periph-supplied CCBs */ 654 static void 655 targstart(struct cam_periph *periph, union ccb *start_ccb) 656 { 657 struct targ_softc *softc; 658 struct targ_cmd_descr *descr, *next_descr; 659 int error; 660 661 softc = (struct targ_softc *)periph->softc; 662 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targstart %p\n", start_ccb)); 663 664 descr = TAILQ_FIRST(&softc->work_queue); 665 if (descr == NULL) { 666 xpt_release_ccb(start_ccb); 667 } else { 668 TAILQ_REMOVE(&softc->work_queue, descr, tqe); 669 next_descr = TAILQ_FIRST(&softc->work_queue); 670 671 /* Initiate a transaction using the descr and supplied CCB */ 672 error = targusermerge(softc, descr, start_ccb); 673 if (error == 0) 674 error = targsendccb(softc, start_ccb, descr); 675 if (error != 0) { 676 xpt_print(periph->path, 677 "targsendccb failed, err %d\n", error); 678 xpt_release_ccb(start_ccb); 679 suword(&descr->user_ccb->ccb_h.status, 680 CAM_REQ_CMP_ERR); 681 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe); 682 notify_user(softc); 683 } 684 685 /* If we have more work to do, stay scheduled */ 686 if (next_descr != NULL) 687 xpt_schedule(periph, next_descr->priority); 688 } 689 } 690 691 static int 692 targusermerge(struct targ_softc *softc, struct targ_cmd_descr *descr, 693 union ccb *ccb) 694 { 695 struct ccb_hdr *u_ccbh, *k_ccbh; 696 size_t ccb_len; 697 int error; 698 699 u_ccbh = &descr->user_ccb->ccb_h; 700 k_ccbh = &ccb->ccb_h; 701 702 /* 703 * There are some fields in the CCB header that need to be 704 * preserved, the rest we get from the user ccb. (See xpt_merge_ccb) 705 */ 706 xpt_setup_ccb(k_ccbh, softc->path, descr->priority); 707 k_ccbh->retry_count = fuword32(&u_ccbh->retry_count); 708 k_ccbh->func_code = descr->func_code; 709 k_ccbh->flags = fuword32(&u_ccbh->flags); 710 k_ccbh->timeout = fuword32(&u_ccbh->timeout); 711 ccb_len = targccblen(k_ccbh->func_code) - sizeof(struct ccb_hdr); 712 error = copyin(u_ccbh + 1, k_ccbh + 1, ccb_len); 713 if (error != 0) { 714 k_ccbh->status = CAM_REQ_CMP_ERR; 715 return (error); 716 } 717 718 /* Translate usermode abort_ccb pointer to its kernel counterpart */ 719 if (k_ccbh->func_code == XPT_ABORT) { 720 struct ccb_abort *cab; 721 struct ccb_hdr *ccb_h; 722 723 cab = (struct ccb_abort *)ccb; 724 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue, 725 periph_links.tqe) { 726 struct targ_cmd_descr *ab_descr; 727 728 ab_descr = (struct targ_cmd_descr *)ccb_h->targ_descr; 729 if (ab_descr->user_ccb == cab->abort_ccb) { 730 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 731 ("Changing abort for %p to %p\n", 732 cab->abort_ccb, ccb_h)); 733 cab->abort_ccb = (union ccb *)ccb_h; 734 break; 735 } 736 } 737 /* CCB not found, set appropriate status */ 738 if (ccb_h == NULL) { 739 k_ccbh->status = CAM_PATH_INVALID; 740 error = ESRCH; 741 } 742 } 743 744 return (error); 745 } 746 747 /* Build and send a kernel CCB formed from descr->user_ccb */ 748 static int 749 targsendccb(struct targ_softc *softc, union ccb *ccb, 750 struct targ_cmd_descr *descr) 751 { 752 struct cam_periph_map_info *mapinfo; 753 struct ccb_hdr *ccb_h; 754 int error; 755 756 ccb_h = &ccb->ccb_h; 757 mapinfo = &descr->mapinfo; 758 mapinfo->num_bufs_used = 0; 759 760 /* 761 * There's no way for the user to have a completion 762 * function, so we put our own completion function in here. 763 * We also stash in a reference to our descriptor so targreturnccb() 764 * can find our mapping info. 765 */ 766 ccb_h->cbfcnp = targdone; 767 ccb_h->targ_descr = descr; 768 769 /* 770 * We only attempt to map the user memory into kernel space 771 * if they haven't passed in a physical memory pointer, 772 * and if there is actually an I/O operation to perform. 773 * Right now cam_periph_mapmem() only supports SCSI and device 774 * match CCBs. For the SCSI CCBs, we only pass the CCB in if 775 * there's actually data to map. cam_periph_mapmem() will do the 776 * right thing, even if there isn't data to map, but since CCBs 777 * without data are a reasonably common occurance (e.g. test unit 778 * ready), it will save a few cycles if we check for it here. 779 */ 780 if (((ccb_h->flags & CAM_DATA_PHYS) == 0) 781 && (((ccb_h->func_code == XPT_CONT_TARGET_IO) 782 && ((ccb_h->flags & CAM_DIR_MASK) != CAM_DIR_NONE)) 783 || (ccb_h->func_code == XPT_DEV_MATCH))) { 784 785 error = cam_periph_mapmem(ccb, mapinfo); 786 787 /* 788 * cam_periph_mapmem returned an error, we can't continue. 789 * Return the error to the user. 790 */ 791 if (error) { 792 ccb_h->status = CAM_REQ_CMP_ERR; 793 mapinfo->num_bufs_used = 0; 794 return (error); 795 } 796 } 797 798 /* 799 * Once queued on the pending CCB list, this CCB will be protected 800 * by our error recovery handler. 801 */ 802 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("sendccb %p\n", ccb)); 803 if (XPT_FC_IS_QUEUED(ccb)) { 804 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, ccb_h, 805 periph_links.tqe); 806 } 807 xpt_action(ccb); 808 809 return (0); 810 } 811 812 /* Completion routine for CCBs (called at splsoftcam) */ 813 static void 814 targdone(struct cam_periph *periph, union ccb *done_ccb) 815 { 816 struct targ_softc *softc; 817 cam_status status; 818 819 CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("targdone %p\n", done_ccb)); 820 softc = (struct targ_softc *)periph->softc; 821 TAILQ_REMOVE(&softc->pending_ccb_queue, &done_ccb->ccb_h, 822 periph_links.tqe); 823 status = done_ccb->ccb_h.status & CAM_STATUS_MASK; 824 825 /* If we're no longer enabled, throw away CCB */ 826 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) { 827 targfreeccb(softc, done_ccb); 828 return; 829 } 830 /* abort_all_pending() waits for pending queue to be empty */ 831 if (TAILQ_EMPTY(&softc->pending_ccb_queue)) 832 wakeup(&softc->pending_ccb_queue); 833 834 switch (done_ccb->ccb_h.func_code) { 835 /* All FC_*_QUEUED CCBs go back to userland */ 836 case XPT_IMMED_NOTIFY: 837 case XPT_ACCEPT_TARGET_IO: 838 case XPT_CONT_TARGET_IO: 839 TAILQ_INSERT_TAIL(&softc->user_ccb_queue, &done_ccb->ccb_h, 840 periph_links.tqe); 841 cam_periph_unlock(softc->periph); 842 notify_user(softc); 843 cam_periph_lock(softc->periph); 844 break; 845 default: 846 panic("targdone: impossible xpt opcode %#x", 847 done_ccb->ccb_h.func_code); 848 /* NOTREACHED */ 849 } 850 } 851 852 /* Return CCBs to the user from the user queue and abort queue */ 853 static int 854 targread(struct cdev *dev, struct uio *uio, int ioflag) 855 { 856 struct descr_queue *abort_queue; 857 struct targ_cmd_descr *user_descr; 858 struct targ_softc *softc; 859 struct ccb_queue *user_queue; 860 struct ccb_hdr *ccb_h; 861 union ccb *user_ccb; 862 int read_len, error; 863 864 error = 0; 865 read_len = 0; 866 softc = (struct targ_softc *)dev->si_drv1; 867 user_queue = &softc->user_ccb_queue; 868 abort_queue = &softc->abort_queue; 869 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targread\n")); 870 871 /* If no data is available, wait or return immediately */ 872 cam_periph_lock(softc->periph); 873 ccb_h = TAILQ_FIRST(user_queue); 874 user_descr = TAILQ_FIRST(abort_queue); 875 while (ccb_h == NULL && user_descr == NULL) { 876 if ((ioflag & IO_NDELAY) == 0) { 877 error = msleep(user_queue, softc->periph->sim->mtx, 878 PRIBIO | PCATCH, "targrd", 0); 879 ccb_h = TAILQ_FIRST(user_queue); 880 user_descr = TAILQ_FIRST(abort_queue); 881 if (error != 0) { 882 if (error == ERESTART) { 883 continue; 884 } else { 885 goto read_fail; 886 } 887 } 888 } else { 889 cam_periph_unlock(softc->periph); 890 return (EAGAIN); 891 } 892 } 893 894 /* Data is available so fill the user's buffer */ 895 while (ccb_h != NULL) { 896 struct targ_cmd_descr *descr; 897 898 if (uio->uio_resid < sizeof(user_ccb)) 899 break; 900 TAILQ_REMOVE(user_queue, ccb_h, periph_links.tqe); 901 descr = (struct targ_cmd_descr *)ccb_h->targ_descr; 902 user_ccb = descr->user_ccb; 903 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 904 ("targread ccb %p (%p)\n", ccb_h, user_ccb)); 905 error = targreturnccb(softc, (union ccb *)ccb_h); 906 if (error != 0) 907 goto read_fail; 908 cam_periph_unlock(softc->periph); 909 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio); 910 cam_periph_lock(softc->periph); 911 if (error != 0) 912 goto read_fail; 913 read_len += sizeof(user_ccb); 914 915 ccb_h = TAILQ_FIRST(user_queue); 916 } 917 918 /* Flush out any aborted descriptors */ 919 while (user_descr != NULL) { 920 if (uio->uio_resid < sizeof(user_ccb)) 921 break; 922 TAILQ_REMOVE(abort_queue, user_descr, tqe); 923 user_ccb = user_descr->user_ccb; 924 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 925 ("targread aborted descr %p (%p)\n", 926 user_descr, user_ccb)); 927 suword(&user_ccb->ccb_h.status, CAM_REQ_ABORTED); 928 cam_periph_unlock(softc->periph); 929 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio); 930 cam_periph_lock(softc->periph); 931 if (error != 0) 932 goto read_fail; 933 read_len += sizeof(user_ccb); 934 935 user_descr = TAILQ_FIRST(abort_queue); 936 } 937 938 /* 939 * If we've successfully read some amount of data, don't report an 940 * error. If the error is persistent, it will be reported on the 941 * next read(). 942 */ 943 if (read_len == 0 && uio->uio_resid != 0) 944 error = ENOSPC; 945 946 read_fail: 947 cam_periph_unlock(softc->periph); 948 return (error); 949 } 950 951 /* Copy completed ccb back to the user */ 952 static int 953 targreturnccb(struct targ_softc *softc, union ccb *ccb) 954 { 955 struct targ_cmd_descr *descr; 956 struct ccb_hdr *u_ccbh; 957 size_t ccb_len; 958 int error; 959 960 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targreturnccb %p\n", ccb)); 961 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr; 962 u_ccbh = &descr->user_ccb->ccb_h; 963 964 /* Copy out the central portion of the ccb_hdr */ 965 copyout(&ccb->ccb_h.retry_count, &u_ccbh->retry_count, 966 offsetof(struct ccb_hdr, periph_priv) - 967 offsetof(struct ccb_hdr, retry_count)); 968 969 /* Copy out the rest of the ccb (after the ccb_hdr) */ 970 ccb_len = targccblen(ccb->ccb_h.func_code) - sizeof(struct ccb_hdr); 971 if (descr->mapinfo.num_bufs_used != 0) 972 cam_periph_unmapmem(ccb, &descr->mapinfo); 973 error = copyout(&ccb->ccb_h + 1, u_ccbh + 1, ccb_len); 974 if (error != 0) { 975 xpt_print(softc->path, 976 "targreturnccb - CCB copyout failed (%d)\n", error); 977 } 978 /* Free CCB or send back to devq. */ 979 targfreeccb(softc, ccb); 980 981 return (error); 982 } 983 984 static union ccb * 985 targgetccb(struct targ_softc *softc, xpt_opcode type, int priority) 986 { 987 union ccb *ccb; 988 int ccb_len; 989 990 ccb_len = targccblen(type); 991 ccb = malloc(ccb_len, M_TARG, M_NOWAIT); 992 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("getccb %p\n", ccb)); 993 if (ccb == NULL) { 994 return (ccb); 995 } 996 xpt_setup_ccb(&ccb->ccb_h, softc->path, priority); 997 ccb->ccb_h.func_code = type; 998 ccb->ccb_h.cbfcnp = targdone; 999 ccb->ccb_h.targ_descr = targgetdescr(softc); 1000 if (ccb->ccb_h.targ_descr == NULL) { 1001 free (ccb, M_TARG); 1002 ccb = NULL; 1003 } 1004 return (ccb); 1005 } 1006 1007 static void 1008 targfreeccb(struct targ_softc *softc, union ccb *ccb) 1009 { 1010 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("targfreeccb descr %p and\n", 1011 ccb->ccb_h.targ_descr)); 1012 free(ccb->ccb_h.targ_descr, M_TARG); 1013 1014 switch (ccb->ccb_h.func_code) { 1015 case XPT_ACCEPT_TARGET_IO: 1016 case XPT_IMMED_NOTIFY: 1017 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("freeing ccb %p\n", ccb)); 1018 free(ccb, M_TARG); 1019 break; 1020 default: 1021 /* Send back CCB if we got it from the periph */ 1022 if (XPT_FC_IS_QUEUED(ccb)) { 1023 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, 1024 ("returning queued ccb %p\n", ccb)); 1025 xpt_release_ccb(ccb); 1026 } else { 1027 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, 1028 ("freeing ccb %p\n", ccb)); 1029 free(ccb, M_TARG); 1030 } 1031 break; 1032 } 1033 } 1034 1035 static struct targ_cmd_descr * 1036 targgetdescr(struct targ_softc *softc) 1037 { 1038 struct targ_cmd_descr *descr; 1039 1040 descr = malloc(sizeof(*descr), M_TARG, 1041 M_NOWAIT); 1042 if (descr) { 1043 descr->mapinfo.num_bufs_used = 0; 1044 } 1045 return (descr); 1046 } 1047 1048 static void 1049 targinit(void) 1050 { 1051 EVENTHANDLER_REGISTER(dev_clone, targclone, 0, 1000); 1052 } 1053 1054 static void 1055 targclone(void *arg, struct ucred *cred, char *name, int namelen, 1056 struct cdev **dev) 1057 { 1058 int u; 1059 1060 if (*dev != NULL) 1061 return; 1062 if (dev_stdclone(name, NULL, "targ", &u) != 1) 1063 return; 1064 *dev = make_dev(&targ_cdevsw, u, UID_ROOT, GID_WHEEL, 1065 0600, "targ%d", u); 1066 dev_ref(*dev); 1067 (*dev)->si_flags |= SI_CHEAPCLONE; 1068 } 1069 1070 static void 1071 targasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg) 1072 { 1073 /* All events are handled in usermode by INOTs */ 1074 panic("targasync() called, should be an INOT instead"); 1075 } 1076 1077 /* Cancel all pending requests and CCBs awaiting work. */ 1078 static void 1079 abort_all_pending(struct targ_softc *softc) 1080 { 1081 struct targ_cmd_descr *descr; 1082 struct ccb_abort cab; 1083 struct ccb_hdr *ccb_h; 1084 struct cam_sim *sim; 1085 1086 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("abort_all_pending\n")); 1087 1088 /* First abort the descriptors awaiting resources */ 1089 while ((descr = TAILQ_FIRST(&softc->work_queue)) != NULL) { 1090 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 1091 ("Aborting descr from workq %p\n", descr)); 1092 TAILQ_REMOVE(&softc->work_queue, descr, tqe); 1093 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe); 1094 } 1095 1096 /* 1097 * Then abort all pending CCBs. 1098 * targdone() will return the aborted CCB via user_ccb_queue 1099 */ 1100 xpt_setup_ccb(&cab.ccb_h, softc->path, CAM_PRIORITY_NORMAL); 1101 cab.ccb_h.func_code = XPT_ABORT; 1102 cab.ccb_h.status = CAM_REQ_CMP_ERR; 1103 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue, periph_links.tqe) { 1104 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 1105 ("Aborting pending CCB %p\n", ccb_h)); 1106 cab.abort_ccb = (union ccb *)ccb_h; 1107 xpt_action((union ccb *)&cab); 1108 if (cab.ccb_h.status != CAM_REQ_CMP) { 1109 xpt_print(cab.ccb_h.path, 1110 "Unable to abort CCB, status %#x\n", 1111 cab.ccb_h.status); 1112 } 1113 } 1114 1115 /* If we aborted at least one pending CCB ok, wait for it. */ 1116 if (cab.ccb_h.status == CAM_REQ_CMP) { 1117 sim = xpt_path_sim(softc->path); 1118 msleep(&softc->pending_ccb_queue, sim->mtx, 1119 PRIBIO | PCATCH, "tgabrt", 0); 1120 } 1121 1122 /* If we aborted anything from the work queue, wakeup user. */ 1123 if (!TAILQ_EMPTY(&softc->user_ccb_queue) 1124 || !TAILQ_EMPTY(&softc->abort_queue)) { 1125 cam_periph_unlock(softc->periph); 1126 notify_user(softc); 1127 cam_periph_lock(softc->periph); 1128 } 1129 } 1130 1131 /* Notify the user that data is ready */ 1132 static void 1133 notify_user(struct targ_softc *softc) 1134 { 1135 /* 1136 * Notify users sleeping via poll(), kqueue(), and 1137 * blocking read(). 1138 */ 1139 selwakeuppri(&softc->read_select, PRIBIO); 1140 KNOTE_UNLOCKED(&softc->read_select.si_note, 0); 1141 wakeup(&softc->user_ccb_queue); 1142 } 1143 1144 /* Convert CAM status to errno values */ 1145 static int 1146 targcamstatus(cam_status status) 1147 { 1148 switch (status & CAM_STATUS_MASK) { 1149 case CAM_REQ_CMP: /* CCB request completed without error */ 1150 return (0); 1151 case CAM_REQ_INPROG: /* CCB request is in progress */ 1152 return (EINPROGRESS); 1153 case CAM_REQ_CMP_ERR: /* CCB request completed with an error */ 1154 return (EIO); 1155 case CAM_PROVIDE_FAIL: /* Unable to provide requested capability */ 1156 return (ENOTTY); 1157 case CAM_FUNC_NOTAVAIL: /* The requested function is not available */ 1158 return (ENOTSUP); 1159 case CAM_LUN_ALRDY_ENA: /* LUN is already enabled for target mode */ 1160 return (EADDRINUSE); 1161 case CAM_PATH_INVALID: /* Supplied Path ID is invalid */ 1162 case CAM_DEV_NOT_THERE: /* SCSI Device Not Installed/there */ 1163 return (ENOENT); 1164 case CAM_REQ_ABORTED: /* CCB request aborted by the host */ 1165 return (ECANCELED); 1166 case CAM_CMD_TIMEOUT: /* Command timeout */ 1167 return (ETIMEDOUT); 1168 case CAM_REQUEUE_REQ: /* Requeue to preserve transaction ordering */ 1169 return (EAGAIN); 1170 case CAM_REQ_INVALID: /* CCB request was invalid */ 1171 return (EINVAL); 1172 case CAM_RESRC_UNAVAIL: /* Resource Unavailable */ 1173 return (ENOMEM); 1174 case CAM_BUSY: /* CAM subsystem is busy */ 1175 case CAM_UA_ABORT: /* Unable to abort CCB request */ 1176 return (EBUSY); 1177 default: 1178 return (ENXIO); 1179 } 1180 } 1181 1182 static size_t 1183 targccblen(xpt_opcode func_code) 1184 { 1185 int len; 1186 1187 /* Codes we expect to see as a target */ 1188 switch (func_code) { 1189 case XPT_CONT_TARGET_IO: 1190 case XPT_SCSI_IO: 1191 len = sizeof(struct ccb_scsiio); 1192 break; 1193 case XPT_ACCEPT_TARGET_IO: 1194 len = sizeof(struct ccb_accept_tio); 1195 break; 1196 case XPT_IMMED_NOTIFY: 1197 len = sizeof(struct ccb_immed_notify); 1198 break; 1199 case XPT_REL_SIMQ: 1200 len = sizeof(struct ccb_relsim); 1201 break; 1202 case XPT_PATH_INQ: 1203 len = sizeof(struct ccb_pathinq); 1204 break; 1205 case XPT_DEBUG: 1206 len = sizeof(struct ccb_debug); 1207 break; 1208 case XPT_ABORT: 1209 len = sizeof(struct ccb_abort); 1210 break; 1211 case XPT_EN_LUN: 1212 len = sizeof(struct ccb_en_lun); 1213 break; 1214 default: 1215 len = sizeof(union ccb); 1216 break; 1217 } 1218 1219 return (len); 1220 } 1221 1222 /* 1223 * work around to destroy targ device 1224 * outside of targclose 1225 */ 1226 static void 1227 targdestroy(void *dev) 1228 { 1229 struct cdev *device = (struct cdev *)dev; 1230 struct targ_softc *softc = (struct targ_softc *)device->si_drv1; 1231 1232 #if 0 1233 callout_stop(&softc->destroy_dev_callout); 1234 #endif 1235 1236 mtx_unlock(&softc->destroy_mtx); 1237 mtx_destroy(&softc->destroy_mtx); 1238 free(softc, M_TARG); 1239 device->si_drv1 = 0; 1240 destroy_dev(device); 1241 printf("%s: destroyed dev\n", __func__); 1242 }
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