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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/10.1/sys/cam/scsi/scsi_target.c 260387 2014-01-07 01:51:48Z scottl $"); 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; 239 240 new_lun = (struct ioc_enable_lun *)addr; 241 status = xpt_create_path(&path, /*periph*/NULL, 242 new_lun->path_id, 243 new_lun->target_id, 244 new_lun->lun_id); 245 if (status != CAM_REQ_CMP) { 246 printf("Couldn't create path, status %#x\n", status); 247 break; 248 } 249 xpt_path_lock(path); 250 status = targenable(softc, path, new_lun->grp6_len, 251 new_lun->grp7_len); 252 xpt_path_unlock(path); 253 xpt_free_path(path); 254 break; 255 } 256 case TARGIOCDISABLE: 257 if (softc->periph == NULL) { 258 status = CAM_DEV_NOT_THERE; 259 break; 260 } 261 cam_periph_lock(softc->periph); 262 status = targdisable(softc); 263 cam_periph_unlock(softc->periph); 264 break; 265 case TARGIOCDEBUG: 266 { 267 struct ccb_debug cdbg; 268 269 /* If no periph available, disallow debugging changes */ 270 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) { 271 status = CAM_DEV_NOT_THERE; 272 break; 273 } 274 bzero(&cdbg, sizeof cdbg); 275 if (*((int *)addr) != 0) 276 cdbg.flags = CAM_DEBUG_PERIPH; 277 else 278 cdbg.flags = CAM_DEBUG_NONE; 279 xpt_setup_ccb(&cdbg.ccb_h, softc->path, CAM_PRIORITY_NORMAL); 280 cdbg.ccb_h.func_code = XPT_DEBUG; 281 cdbg.ccb_h.cbfcnp = targdone; 282 xpt_action((union ccb *)&cdbg); 283 status = cdbg.ccb_h.status & CAM_STATUS_MASK; 284 break; 285 } 286 default: 287 status = CAM_PROVIDE_FAIL; 288 break; 289 } 290 291 return (targcamstatus(status)); 292 } 293 294 /* Writes are always ready, reads wait for user_ccb_queue or abort_queue */ 295 static int 296 targpoll(struct cdev *dev, int poll_events, struct thread *td) 297 { 298 struct targ_softc *softc; 299 int revents; 300 301 devfs_get_cdevpriv((void **)&softc); 302 303 /* Poll for write() is always ok. */ 304 revents = poll_events & (POLLOUT | POLLWRNORM); 305 if ((poll_events & (POLLIN | POLLRDNORM)) != 0) { 306 /* Poll for read() depends on user and abort queues. */ 307 cam_periph_lock(softc->periph); 308 if (!TAILQ_EMPTY(&softc->user_ccb_queue) || 309 !TAILQ_EMPTY(&softc->abort_queue)) { 310 revents |= poll_events & (POLLIN | POLLRDNORM); 311 } 312 cam_periph_unlock(softc->periph); 313 /* Only sleep if the user didn't poll for write. */ 314 if (revents == 0) 315 selrecord(td, &softc->read_select); 316 } 317 318 return (revents); 319 } 320 321 static int 322 targkqfilter(struct cdev *dev, struct knote *kn) 323 { 324 struct targ_softc *softc; 325 326 devfs_get_cdevpriv((void **)&softc); 327 kn->kn_hook = (caddr_t)softc; 328 kn->kn_fop = &targread_filtops; 329 knlist_add(&softc->read_select.si_note, kn, 0); 330 return (0); 331 } 332 333 static void 334 targreadfiltdetach(struct knote *kn) 335 { 336 struct targ_softc *softc; 337 338 softc = (struct targ_softc *)kn->kn_hook; 339 knlist_remove(&softc->read_select.si_note, kn, 0); 340 } 341 342 /* Notify the user's kqueue when the user queue or abort queue gets a CCB */ 343 static int 344 targreadfilt(struct knote *kn, long hint) 345 { 346 struct targ_softc *softc; 347 int retval; 348 349 softc = (struct targ_softc *)kn->kn_hook; 350 cam_periph_lock(softc->periph); 351 retval = !TAILQ_EMPTY(&softc->user_ccb_queue) || 352 !TAILQ_EMPTY(&softc->abort_queue); 353 cam_periph_unlock(softc->periph); 354 return (retval); 355 } 356 357 /* Send the HBA the enable/disable message */ 358 static cam_status 359 targendislun(struct cam_path *path, int enable, int grp6_len, int grp7_len) 360 { 361 struct ccb_en_lun en_ccb; 362 cam_status status; 363 364 /* Tell the lun to begin answering selects */ 365 xpt_setup_ccb(&en_ccb.ccb_h, path, CAM_PRIORITY_NORMAL); 366 en_ccb.ccb_h.func_code = XPT_EN_LUN; 367 /* Don't need support for any vendor specific commands */ 368 en_ccb.grp6_len = grp6_len; 369 en_ccb.grp7_len = grp7_len; 370 en_ccb.enable = enable ? 1 : 0; 371 xpt_action((union ccb *)&en_ccb); 372 status = en_ccb.ccb_h.status & CAM_STATUS_MASK; 373 if (status != CAM_REQ_CMP) { 374 xpt_print(path, "%sable lun CCB rejected, status %#x\n", 375 enable ? "en" : "dis", status); 376 } 377 return (status); 378 } 379 380 /* Enable target mode on a LUN, given its path */ 381 static cam_status 382 targenable(struct targ_softc *softc, struct cam_path *path, int grp6_len, 383 int grp7_len) 384 { 385 struct cam_periph *periph; 386 struct ccb_pathinq cpi; 387 cam_status status; 388 389 if ((softc->state & TARG_STATE_LUN_ENABLED) != 0) 390 return (CAM_LUN_ALRDY_ENA); 391 392 /* Make sure SIM supports target mode */ 393 xpt_setup_ccb(&cpi.ccb_h, path, CAM_PRIORITY_NORMAL); 394 cpi.ccb_h.func_code = XPT_PATH_INQ; 395 xpt_action((union ccb *)&cpi); 396 status = cpi.ccb_h.status & CAM_STATUS_MASK; 397 if (status != CAM_REQ_CMP) { 398 printf("pathinq failed, status %#x\n", status); 399 goto enable_fail; 400 } 401 if ((cpi.target_sprt & PIT_PROCESSOR) == 0) { 402 printf("controller does not support target mode\n"); 403 status = CAM_FUNC_NOTAVAIL; 404 goto enable_fail; 405 } 406 407 /* Destroy any periph on our path if it is disabled */ 408 periph = cam_periph_find(path, "targ"); 409 if (periph != NULL) { 410 struct targ_softc *del_softc; 411 412 del_softc = (struct targ_softc *)periph->softc; 413 if ((del_softc->state & TARG_STATE_LUN_ENABLED) == 0) { 414 cam_periph_invalidate(del_softc->periph); 415 del_softc->periph = NULL; 416 } else { 417 printf("Requested path still in use by targ%d\n", 418 periph->unit_number); 419 status = CAM_LUN_ALRDY_ENA; 420 goto enable_fail; 421 } 422 } 423 424 /* Create a periph instance attached to this path */ 425 status = cam_periph_alloc(targctor, NULL, targdtor, targstart, 426 "targ", CAM_PERIPH_BIO, path, targasync, 0, softc); 427 if (status != CAM_REQ_CMP) { 428 printf("cam_periph_alloc failed, status %#x\n", status); 429 goto enable_fail; 430 } 431 432 /* Ensure that the periph now exists. */ 433 if (cam_periph_find(path, "targ") == NULL) { 434 panic("targenable: succeeded but no periph?"); 435 /* NOTREACHED */ 436 } 437 438 /* Send the enable lun message */ 439 status = targendislun(path, /*enable*/1, grp6_len, grp7_len); 440 if (status != CAM_REQ_CMP) { 441 printf("enable lun failed, status %#x\n", status); 442 goto enable_fail; 443 } 444 softc->state |= TARG_STATE_LUN_ENABLED; 445 446 enable_fail: 447 return (status); 448 } 449 450 /* Disable this softc's target instance if enabled */ 451 static cam_status 452 targdisable(struct targ_softc *softc) 453 { 454 cam_status status; 455 456 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) 457 return (CAM_REQ_CMP); 458 459 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targdisable\n")); 460 461 /* Abort any ccbs pending on the controller */ 462 abort_all_pending(softc); 463 464 /* Disable this lun */ 465 status = targendislun(softc->path, /*enable*/0, 466 /*grp6_len*/0, /*grp7_len*/0); 467 if (status == CAM_REQ_CMP) 468 softc->state &= ~TARG_STATE_LUN_ENABLED; 469 else 470 printf("Disable lun failed, status %#x\n", status); 471 472 return (status); 473 } 474 475 /* Initialize a periph (called from cam_periph_alloc) */ 476 static cam_status 477 targctor(struct cam_periph *periph, void *arg) 478 { 479 struct targ_softc *softc; 480 481 /* Store pointer to softc for periph-driven routines */ 482 softc = (struct targ_softc *)arg; 483 periph->softc = softc; 484 softc->periph = periph; 485 softc->path = periph->path; 486 return (CAM_REQ_CMP); 487 } 488 489 static void 490 targdtor(struct cam_periph *periph) 491 { 492 struct targ_softc *softc; 493 struct ccb_hdr *ccb_h; 494 struct targ_cmd_descr *descr; 495 496 softc = (struct targ_softc *)periph->softc; 497 498 /* 499 * targdisable() aborts CCBs back to the user and leaves them 500 * on user_ccb_queue and abort_queue in case the user is still 501 * interested in them. We free them now. 502 */ 503 while ((ccb_h = TAILQ_FIRST(&softc->user_ccb_queue)) != NULL) { 504 TAILQ_REMOVE(&softc->user_ccb_queue, ccb_h, periph_links.tqe); 505 targfreeccb(softc, (union ccb *)ccb_h); 506 } 507 while ((descr = TAILQ_FIRST(&softc->abort_queue)) != NULL) { 508 TAILQ_REMOVE(&softc->abort_queue, descr, tqe); 509 free(descr, M_TARG); 510 } 511 512 softc->periph = NULL; 513 softc->path = NULL; 514 periph->softc = NULL; 515 } 516 517 /* Receive CCBs from user mode proc and send them to the HBA */ 518 static int 519 targwrite(struct cdev *dev, struct uio *uio, int ioflag) 520 { 521 union ccb *user_ccb; 522 struct targ_softc *softc; 523 struct targ_cmd_descr *descr; 524 int write_len, error; 525 int func_code, priority; 526 527 devfs_get_cdevpriv((void **)&softc); 528 write_len = error = 0; 529 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 530 ("write - uio_resid %zd\n", uio->uio_resid)); 531 while (uio->uio_resid >= sizeof(user_ccb) && error == 0) { 532 union ccb *ccb; 533 534 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio); 535 if (error != 0) { 536 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 537 ("write - uiomove failed (%d)\n", error)); 538 break; 539 } 540 priority = fuword32(&user_ccb->ccb_h.pinfo.priority); 541 if (priority == CAM_PRIORITY_NONE) { 542 error = EINVAL; 543 break; 544 } 545 func_code = fuword32(&user_ccb->ccb_h.func_code); 546 switch (func_code) { 547 case XPT_ACCEPT_TARGET_IO: 548 case XPT_IMMED_NOTIFY: 549 case XPT_IMMEDIATE_NOTIFY: 550 cam_periph_lock(softc->periph); 551 ccb = targgetccb(softc, func_code, priority); 552 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr; 553 descr->user_ccb = user_ccb; 554 descr->func_code = func_code; 555 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 556 ("Sent ATIO/INOT (%p)\n", user_ccb)); 557 xpt_action(ccb); 558 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, 559 &ccb->ccb_h, 560 periph_links.tqe); 561 cam_periph_unlock(softc->periph); 562 break; 563 default: 564 cam_periph_lock(softc->periph); 565 if ((func_code & XPT_FC_QUEUED) != 0) { 566 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 567 ("Sending queued ccb %#x (%p)\n", 568 func_code, user_ccb)); 569 descr = targgetdescr(softc); 570 descr->user_ccb = user_ccb; 571 descr->priority = priority; 572 descr->func_code = func_code; 573 TAILQ_INSERT_TAIL(&softc->work_queue, 574 descr, tqe); 575 xpt_schedule(softc->periph, priority); 576 } else { 577 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 578 ("Sending inline ccb %#x (%p)\n", 579 func_code, user_ccb)); 580 ccb = targgetccb(softc, func_code, priority); 581 descr = (struct targ_cmd_descr *) 582 ccb->ccb_h.targ_descr; 583 descr->user_ccb = user_ccb; 584 descr->priority = priority; 585 descr->func_code = func_code; 586 if (targusermerge(softc, descr, ccb) != EFAULT) 587 targsendccb(softc, ccb, descr); 588 targreturnccb(softc, ccb); 589 } 590 cam_periph_unlock(softc->periph); 591 break; 592 } 593 write_len += sizeof(user_ccb); 594 } 595 596 /* 597 * If we've successfully taken in some amount of 598 * data, return success for that data first. If 599 * an error is persistent, it will be reported 600 * on the next write. 601 */ 602 if (error != 0 && write_len == 0) 603 return (error); 604 if (write_len == 0 && uio->uio_resid != 0) 605 return (ENOSPC); 606 return (0); 607 } 608 609 /* Process requests (descrs) via the periph-supplied CCBs */ 610 static void 611 targstart(struct cam_periph *periph, union ccb *start_ccb) 612 { 613 struct targ_softc *softc; 614 struct targ_cmd_descr *descr, *next_descr; 615 int error; 616 617 softc = (struct targ_softc *)periph->softc; 618 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targstart %p\n", start_ccb)); 619 620 descr = TAILQ_FIRST(&softc->work_queue); 621 if (descr == NULL) { 622 xpt_release_ccb(start_ccb); 623 } else { 624 TAILQ_REMOVE(&softc->work_queue, descr, tqe); 625 next_descr = TAILQ_FIRST(&softc->work_queue); 626 627 /* Initiate a transaction using the descr and supplied CCB */ 628 error = targusermerge(softc, descr, start_ccb); 629 if (error == 0) 630 error = targsendccb(softc, start_ccb, descr); 631 if (error != 0) { 632 xpt_print(periph->path, 633 "targsendccb failed, err %d\n", error); 634 xpt_release_ccb(start_ccb); 635 suword(&descr->user_ccb->ccb_h.status, 636 CAM_REQ_CMP_ERR); 637 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe); 638 notify_user(softc); 639 } 640 641 /* If we have more work to do, stay scheduled */ 642 if (next_descr != NULL) 643 xpt_schedule(periph, next_descr->priority); 644 } 645 } 646 647 static int 648 targusermerge(struct targ_softc *softc, struct targ_cmd_descr *descr, 649 union ccb *ccb) 650 { 651 struct ccb_hdr *u_ccbh, *k_ccbh; 652 size_t ccb_len; 653 int error; 654 655 u_ccbh = &descr->user_ccb->ccb_h; 656 k_ccbh = &ccb->ccb_h; 657 658 /* 659 * There are some fields in the CCB header that need to be 660 * preserved, the rest we get from the user ccb. (See xpt_merge_ccb) 661 */ 662 xpt_setup_ccb(k_ccbh, softc->path, descr->priority); 663 k_ccbh->retry_count = fuword32(&u_ccbh->retry_count); 664 k_ccbh->func_code = descr->func_code; 665 k_ccbh->flags = fuword32(&u_ccbh->flags); 666 k_ccbh->timeout = fuword32(&u_ccbh->timeout); 667 ccb_len = targccblen(k_ccbh->func_code) - sizeof(struct ccb_hdr); 668 error = copyin(u_ccbh + 1, k_ccbh + 1, ccb_len); 669 if (error != 0) { 670 k_ccbh->status = CAM_REQ_CMP_ERR; 671 return (error); 672 } 673 674 /* Translate usermode abort_ccb pointer to its kernel counterpart */ 675 if (k_ccbh->func_code == XPT_ABORT) { 676 struct ccb_abort *cab; 677 struct ccb_hdr *ccb_h; 678 679 cab = (struct ccb_abort *)ccb; 680 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue, 681 periph_links.tqe) { 682 struct targ_cmd_descr *ab_descr; 683 684 ab_descr = (struct targ_cmd_descr *)ccb_h->targ_descr; 685 if (ab_descr->user_ccb == cab->abort_ccb) { 686 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 687 ("Changing abort for %p to %p\n", 688 cab->abort_ccb, ccb_h)); 689 cab->abort_ccb = (union ccb *)ccb_h; 690 break; 691 } 692 } 693 /* CCB not found, set appropriate status */ 694 if (ccb_h == NULL) { 695 k_ccbh->status = CAM_PATH_INVALID; 696 error = ESRCH; 697 } 698 } 699 700 return (error); 701 } 702 703 /* Build and send a kernel CCB formed from descr->user_ccb */ 704 static int 705 targsendccb(struct targ_softc *softc, union ccb *ccb, 706 struct targ_cmd_descr *descr) 707 { 708 struct cam_periph_map_info *mapinfo; 709 struct ccb_hdr *ccb_h; 710 int error; 711 712 ccb_h = &ccb->ccb_h; 713 mapinfo = &descr->mapinfo; 714 mapinfo->num_bufs_used = 0; 715 716 /* 717 * There's no way for the user to have a completion 718 * function, so we put our own completion function in here. 719 * We also stash in a reference to our descriptor so targreturnccb() 720 * can find our mapping info. 721 */ 722 ccb_h->cbfcnp = targdone; 723 ccb_h->targ_descr = descr; 724 725 if ((ccb_h->func_code == XPT_CONT_TARGET_IO) || 726 (ccb_h->func_code == XPT_DEV_MATCH)) { 727 728 error = cam_periph_mapmem(ccb, mapinfo); 729 730 /* 731 * cam_periph_mapmem returned an error, we can't continue. 732 * Return the error to the user. 733 */ 734 if (error) { 735 ccb_h->status = CAM_REQ_CMP_ERR; 736 mapinfo->num_bufs_used = 0; 737 return (error); 738 } 739 } 740 741 /* 742 * Once queued on the pending CCB list, this CCB will be protected 743 * by our error recovery handler. 744 */ 745 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("sendccb %p\n", ccb)); 746 if (XPT_FC_IS_QUEUED(ccb)) { 747 TAILQ_INSERT_TAIL(&softc->pending_ccb_queue, ccb_h, 748 periph_links.tqe); 749 } 750 xpt_action(ccb); 751 752 return (0); 753 } 754 755 /* Completion routine for CCBs (called at splsoftcam) */ 756 static void 757 targdone(struct cam_periph *periph, union ccb *done_ccb) 758 { 759 struct targ_softc *softc; 760 cam_status status; 761 762 CAM_DEBUG(periph->path, CAM_DEBUG_PERIPH, ("targdone %p\n", done_ccb)); 763 softc = (struct targ_softc *)periph->softc; 764 TAILQ_REMOVE(&softc->pending_ccb_queue, &done_ccb->ccb_h, 765 periph_links.tqe); 766 status = done_ccb->ccb_h.status & CAM_STATUS_MASK; 767 768 /* If we're no longer enabled, throw away CCB */ 769 if ((softc->state & TARG_STATE_LUN_ENABLED) == 0) { 770 targfreeccb(softc, done_ccb); 771 return; 772 } 773 /* abort_all_pending() waits for pending queue to be empty */ 774 if (TAILQ_EMPTY(&softc->pending_ccb_queue)) 775 wakeup(&softc->pending_ccb_queue); 776 777 switch (done_ccb->ccb_h.func_code) { 778 /* All FC_*_QUEUED CCBs go back to userland */ 779 case XPT_IMMED_NOTIFY: 780 case XPT_IMMEDIATE_NOTIFY: 781 case XPT_ACCEPT_TARGET_IO: 782 case XPT_CONT_TARGET_IO: 783 TAILQ_INSERT_TAIL(&softc->user_ccb_queue, &done_ccb->ccb_h, 784 periph_links.tqe); 785 cam_periph_unlock(softc->periph); 786 notify_user(softc); 787 cam_periph_lock(softc->periph); 788 break; 789 default: 790 panic("targdone: impossible xpt opcode %#x", 791 done_ccb->ccb_h.func_code); 792 /* NOTREACHED */ 793 } 794 } 795 796 /* Return CCBs to the user from the user queue and abort queue */ 797 static int 798 targread(struct cdev *dev, struct uio *uio, int ioflag) 799 { 800 struct descr_queue *abort_queue; 801 struct targ_cmd_descr *user_descr; 802 struct targ_softc *softc; 803 struct ccb_queue *user_queue; 804 struct ccb_hdr *ccb_h; 805 union ccb *user_ccb; 806 int read_len, error; 807 808 error = 0; 809 read_len = 0; 810 devfs_get_cdevpriv((void **)&softc); 811 user_queue = &softc->user_ccb_queue; 812 abort_queue = &softc->abort_queue; 813 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targread\n")); 814 815 /* If no data is available, wait or return immediately */ 816 cam_periph_lock(softc->periph); 817 ccb_h = TAILQ_FIRST(user_queue); 818 user_descr = TAILQ_FIRST(abort_queue); 819 while (ccb_h == NULL && user_descr == NULL) { 820 if ((ioflag & IO_NDELAY) == 0) { 821 error = cam_periph_sleep(softc->periph, user_queue, 822 PRIBIO | PCATCH, "targrd", 0); 823 ccb_h = TAILQ_FIRST(user_queue); 824 user_descr = TAILQ_FIRST(abort_queue); 825 if (error != 0) { 826 if (error == ERESTART) { 827 continue; 828 } else { 829 goto read_fail; 830 } 831 } 832 } else { 833 cam_periph_unlock(softc->periph); 834 return (EAGAIN); 835 } 836 } 837 838 /* Data is available so fill the user's buffer */ 839 while (ccb_h != NULL) { 840 struct targ_cmd_descr *descr; 841 842 if (uio->uio_resid < sizeof(user_ccb)) 843 break; 844 TAILQ_REMOVE(user_queue, ccb_h, periph_links.tqe); 845 descr = (struct targ_cmd_descr *)ccb_h->targ_descr; 846 user_ccb = descr->user_ccb; 847 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 848 ("targread ccb %p (%p)\n", ccb_h, user_ccb)); 849 error = targreturnccb(softc, (union ccb *)ccb_h); 850 if (error != 0) 851 goto read_fail; 852 cam_periph_unlock(softc->periph); 853 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio); 854 cam_periph_lock(softc->periph); 855 if (error != 0) 856 goto read_fail; 857 read_len += sizeof(user_ccb); 858 859 ccb_h = TAILQ_FIRST(user_queue); 860 } 861 862 /* Flush out any aborted descriptors */ 863 while (user_descr != NULL) { 864 if (uio->uio_resid < sizeof(user_ccb)) 865 break; 866 TAILQ_REMOVE(abort_queue, user_descr, tqe); 867 user_ccb = user_descr->user_ccb; 868 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 869 ("targread aborted descr %p (%p)\n", 870 user_descr, user_ccb)); 871 suword(&user_ccb->ccb_h.status, CAM_REQ_ABORTED); 872 cam_periph_unlock(softc->periph); 873 error = uiomove((caddr_t)&user_ccb, sizeof(user_ccb), uio); 874 cam_periph_lock(softc->periph); 875 if (error != 0) 876 goto read_fail; 877 read_len += sizeof(user_ccb); 878 879 user_descr = TAILQ_FIRST(abort_queue); 880 } 881 882 /* 883 * If we've successfully read some amount of data, don't report an 884 * error. If the error is persistent, it will be reported on the 885 * next read(). 886 */ 887 if (read_len == 0 && uio->uio_resid != 0) 888 error = ENOSPC; 889 890 read_fail: 891 cam_periph_unlock(softc->periph); 892 return (error); 893 } 894 895 /* Copy completed ccb back to the user */ 896 static int 897 targreturnccb(struct targ_softc *softc, union ccb *ccb) 898 { 899 struct targ_cmd_descr *descr; 900 struct ccb_hdr *u_ccbh; 901 size_t ccb_len; 902 int error; 903 904 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("targreturnccb %p\n", ccb)); 905 descr = (struct targ_cmd_descr *)ccb->ccb_h.targ_descr; 906 u_ccbh = &descr->user_ccb->ccb_h; 907 908 /* Copy out the central portion of the ccb_hdr */ 909 copyout(&ccb->ccb_h.retry_count, &u_ccbh->retry_count, 910 offsetof(struct ccb_hdr, periph_priv) - 911 offsetof(struct ccb_hdr, retry_count)); 912 913 /* Copy out the rest of the ccb (after the ccb_hdr) */ 914 ccb_len = targccblen(ccb->ccb_h.func_code) - sizeof(struct ccb_hdr); 915 if (descr->mapinfo.num_bufs_used != 0) 916 cam_periph_unmapmem(ccb, &descr->mapinfo); 917 error = copyout(&ccb->ccb_h + 1, u_ccbh + 1, ccb_len); 918 if (error != 0) { 919 xpt_print(softc->path, 920 "targreturnccb - CCB copyout failed (%d)\n", error); 921 } 922 /* Free CCB or send back to devq. */ 923 targfreeccb(softc, ccb); 924 925 return (error); 926 } 927 928 static union ccb * 929 targgetccb(struct targ_softc *softc, xpt_opcode type, int priority) 930 { 931 union ccb *ccb; 932 int ccb_len; 933 934 ccb_len = targccblen(type); 935 ccb = malloc(ccb_len, M_TARG, M_NOWAIT); 936 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("getccb %p\n", ccb)); 937 if (ccb == NULL) { 938 return (ccb); 939 } 940 xpt_setup_ccb(&ccb->ccb_h, softc->path, priority); 941 ccb->ccb_h.func_code = type; 942 ccb->ccb_h.cbfcnp = targdone; 943 ccb->ccb_h.targ_descr = targgetdescr(softc); 944 if (ccb->ccb_h.targ_descr == NULL) { 945 free (ccb, M_TARG); 946 ccb = NULL; 947 } 948 return (ccb); 949 } 950 951 static void 952 targfreeccb(struct targ_softc *softc, union ccb *ccb) 953 { 954 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("targfreeccb descr %p and\n", 955 ccb->ccb_h.targ_descr)); 956 free(ccb->ccb_h.targ_descr, M_TARG); 957 958 switch (ccb->ccb_h.func_code) { 959 case XPT_ACCEPT_TARGET_IO: 960 case XPT_IMMED_NOTIFY: 961 case XPT_IMMEDIATE_NOTIFY: 962 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, ("freeing ccb %p\n", ccb)); 963 free(ccb, M_TARG); 964 break; 965 default: 966 /* Send back CCB if we got it from the periph */ 967 if (XPT_FC_IS_QUEUED(ccb)) { 968 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, 969 ("returning queued ccb %p\n", ccb)); 970 xpt_release_ccb(ccb); 971 } else { 972 CAM_DEBUG_PRINT(CAM_DEBUG_PERIPH, 973 ("freeing ccb %p\n", ccb)); 974 free(ccb, M_TARG); 975 } 976 break; 977 } 978 } 979 980 static struct targ_cmd_descr * 981 targgetdescr(struct targ_softc *softc) 982 { 983 struct targ_cmd_descr *descr; 984 985 descr = malloc(sizeof(*descr), M_TARG, 986 M_NOWAIT); 987 if (descr) { 988 descr->mapinfo.num_bufs_used = 0; 989 } 990 return (descr); 991 } 992 993 static void 994 targinit(void) 995 { 996 struct cdev *dev; 997 998 /* Add symbolic link to targ0 for compatibility. */ 999 dev = make_dev(&targ_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600, "targ"); 1000 make_dev_alias(dev, "targ0"); 1001 } 1002 1003 static void 1004 targasync(void *callback_arg, u_int32_t code, struct cam_path *path, void *arg) 1005 { 1006 /* All events are handled in usermode by INOTs */ 1007 panic("targasync() called, should be an INOT instead"); 1008 } 1009 1010 /* Cancel all pending requests and CCBs awaiting work. */ 1011 static void 1012 abort_all_pending(struct targ_softc *softc) 1013 { 1014 struct targ_cmd_descr *descr; 1015 struct ccb_abort cab; 1016 struct ccb_hdr *ccb_h; 1017 1018 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, ("abort_all_pending\n")); 1019 1020 /* First abort the descriptors awaiting resources */ 1021 while ((descr = TAILQ_FIRST(&softc->work_queue)) != NULL) { 1022 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 1023 ("Aborting descr from workq %p\n", descr)); 1024 TAILQ_REMOVE(&softc->work_queue, descr, tqe); 1025 TAILQ_INSERT_TAIL(&softc->abort_queue, descr, tqe); 1026 } 1027 1028 /* 1029 * Then abort all pending CCBs. 1030 * targdone() will return the aborted CCB via user_ccb_queue 1031 */ 1032 xpt_setup_ccb(&cab.ccb_h, softc->path, CAM_PRIORITY_NORMAL); 1033 cab.ccb_h.func_code = XPT_ABORT; 1034 cab.ccb_h.status = CAM_REQ_CMP_ERR; 1035 TAILQ_FOREACH(ccb_h, &softc->pending_ccb_queue, periph_links.tqe) { 1036 CAM_DEBUG(softc->path, CAM_DEBUG_PERIPH, 1037 ("Aborting pending CCB %p\n", ccb_h)); 1038 cab.abort_ccb = (union ccb *)ccb_h; 1039 xpt_action((union ccb *)&cab); 1040 if (cab.ccb_h.status != CAM_REQ_CMP) { 1041 xpt_print(cab.ccb_h.path, 1042 "Unable to abort CCB, status %#x\n", 1043 cab.ccb_h.status); 1044 } 1045 } 1046 1047 /* If we aborted at least one pending CCB ok, wait for it. */ 1048 if (cab.ccb_h.status == CAM_REQ_CMP) { 1049 cam_periph_sleep(softc->periph, &softc->pending_ccb_queue, 1050 PRIBIO | PCATCH, "tgabrt", 0); 1051 } 1052 1053 /* If we aborted anything from the work queue, wakeup user. */ 1054 if (!TAILQ_EMPTY(&softc->user_ccb_queue) 1055 || !TAILQ_EMPTY(&softc->abort_queue)) { 1056 cam_periph_unlock(softc->periph); 1057 notify_user(softc); 1058 cam_periph_lock(softc->periph); 1059 } 1060 } 1061 1062 /* Notify the user that data is ready */ 1063 static void 1064 notify_user(struct targ_softc *softc) 1065 { 1066 /* 1067 * Notify users sleeping via poll(), kqueue(), and 1068 * blocking read(). 1069 */ 1070 selwakeuppri(&softc->read_select, PRIBIO); 1071 KNOTE_UNLOCKED(&softc->read_select.si_note, 0); 1072 wakeup(&softc->user_ccb_queue); 1073 } 1074 1075 /* Convert CAM status to errno values */ 1076 static int 1077 targcamstatus(cam_status status) 1078 { 1079 switch (status & CAM_STATUS_MASK) { 1080 case CAM_REQ_CMP: /* CCB request completed without error */ 1081 return (0); 1082 case CAM_REQ_INPROG: /* CCB request is in progress */ 1083 return (EINPROGRESS); 1084 case CAM_REQ_CMP_ERR: /* CCB request completed with an error */ 1085 return (EIO); 1086 case CAM_PROVIDE_FAIL: /* Unable to provide requested capability */ 1087 return (ENOTTY); 1088 case CAM_FUNC_NOTAVAIL: /* The requested function is not available */ 1089 return (ENOTSUP); 1090 case CAM_LUN_ALRDY_ENA: /* LUN is already enabled for target mode */ 1091 return (EADDRINUSE); 1092 case CAM_PATH_INVALID: /* Supplied Path ID is invalid */ 1093 case CAM_DEV_NOT_THERE: /* SCSI Device Not Installed/there */ 1094 return (ENOENT); 1095 case CAM_REQ_ABORTED: /* CCB request aborted by the host */ 1096 return (ECANCELED); 1097 case CAM_CMD_TIMEOUT: /* Command timeout */ 1098 return (ETIMEDOUT); 1099 case CAM_REQUEUE_REQ: /* Requeue to preserve transaction ordering */ 1100 return (EAGAIN); 1101 case CAM_REQ_INVALID: /* CCB request was invalid */ 1102 return (EINVAL); 1103 case CAM_RESRC_UNAVAIL: /* Resource Unavailable */ 1104 return (ENOMEM); 1105 case CAM_BUSY: /* CAM subsystem is busy */ 1106 case CAM_UA_ABORT: /* Unable to abort CCB request */ 1107 return (EBUSY); 1108 default: 1109 return (ENXIO); 1110 } 1111 } 1112 1113 static size_t 1114 targccblen(xpt_opcode func_code) 1115 { 1116 int len; 1117 1118 /* Codes we expect to see as a target */ 1119 switch (func_code) { 1120 case XPT_CONT_TARGET_IO: 1121 case XPT_SCSI_IO: 1122 len = sizeof(struct ccb_scsiio); 1123 break; 1124 case XPT_ACCEPT_TARGET_IO: 1125 len = sizeof(struct ccb_accept_tio); 1126 break; 1127 case XPT_IMMED_NOTIFY: 1128 len = sizeof(struct ccb_immed_notify); 1129 break; 1130 case XPT_IMMEDIATE_NOTIFY: 1131 len = sizeof(struct ccb_immediate_notify); 1132 break; 1133 case XPT_REL_SIMQ: 1134 len = sizeof(struct ccb_relsim); 1135 break; 1136 case XPT_PATH_INQ: 1137 len = sizeof(struct ccb_pathinq); 1138 break; 1139 case XPT_DEBUG: 1140 len = sizeof(struct ccb_debug); 1141 break; 1142 case XPT_ABORT: 1143 len = sizeof(struct ccb_abort); 1144 break; 1145 case XPT_EN_LUN: 1146 len = sizeof(struct ccb_en_lun); 1147 break; 1148 default: 1149 len = sizeof(union ccb); 1150 break; 1151 } 1152 1153 return (len); 1154 }
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