1 /* 2 * Copyright (c) 2010 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Alex Hornung <ahornung@gmail.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/kernel.h> 37 #include <sys/proc.h> 38 #include <sys/buf.h> 39 #include <sys/conf.h> 40 #include <sys/event.h> 41 #include <sys/vnode.h> 42 #include <sys/malloc.h> 43 #include <sys/objcache.h> 44 #include <sys/ctype.h> 45 #include <sys/syslog.h> 46 #include <sys/udev.h> 47 #include <sys/devfs.h> 48 #include <libprop/proplib.h> 49 50 #include <sys/thread2.h> 51 52 MALLOC_DEFINE(M_UDEV, "udev", "udev allocs"); 53 static struct objcache *udev_event_kernel_cache; 54 55 /* XXX: use UUIDs for identification; would need help from devfs */ 56 57 static cdev_t udev_dev; 58 static d_open_t udev_dev_open; 59 static d_close_t udev_dev_close; 60 static d_read_t udev_dev_read; 61 static d_kqfilter_t udev_dev_kqfilter; 62 static d_ioctl_t udev_dev_ioctl; 63 static d_clone_t udev_dev_clone; 64 65 struct udev_prop_ctx { 66 prop_array_t cdevs; 67 int error; 68 }; 69 70 struct udev_event_kernel { 71 struct udev_event ev; 72 TAILQ_ENTRY(udev_event_kernel) link; 73 }; 74 75 struct udev_softc { 76 TAILQ_ENTRY(udev_softc) entry; 77 int opened; 78 int initiated; 79 int unit; 80 cdev_t dev; 81 82 struct udev_event_kernel marker; /* udev_evq marker */ 83 }; 84 85 struct cmd_function { 86 const char *cmd; 87 int (*fn)(struct udev_softc *, struct plistref *, 88 u_long, prop_dictionary_t); 89 }; 90 91 92 static int _udev_dict_set_cstr(prop_dictionary_t, const char *, char *); 93 static int _udev_dict_set_int(prop_dictionary_t, const char *, int64_t); 94 static int _udev_dict_set_uint(prop_dictionary_t, const char *, uint64_t); 95 static int _udev_dict_delete_key(prop_dictionary_t, const char *); 96 static prop_dictionary_t udev_init_dict_event(cdev_t, const char *); 97 static int udev_init_dict(cdev_t); 98 static int udev_destroy_dict(cdev_t); 99 static void udev_event_insert(int, prop_dictionary_t); 100 static void udev_clean_events_locked(void); 101 static char *udev_event_externalize(struct udev_event_kernel *); 102 static void udev_getdevs_scan_callback(char *, cdev_t, bool, void *); 103 static int udev_getdevs_ioctl(struct udev_softc *, struct plistref *, 104 u_long, prop_dictionary_t); 105 static void udev_dev_filter_detach(struct knote *); 106 static int udev_dev_filter_read(struct knote *, long); 107 108 static struct dev_ops udev_dev_ops = { 109 { "udev", 0, 0 }, 110 .d_open = udev_dev_open, 111 .d_close = udev_dev_close, 112 .d_read = udev_dev_read, 113 .d_kqfilter = udev_dev_kqfilter, 114 .d_ioctl = udev_dev_ioctl 115 }; 116 117 static struct cmd_function cmd_fn[] = { 118 { .cmd = "getdevs", .fn = udev_getdevs_ioctl}, 119 {NULL, NULL} 120 }; 121 122 DEVFS_DEFINE_CLONE_BITMAP(udev); 123 124 static TAILQ_HEAD(, udev_softc) udevq; 125 static TAILQ_HEAD(, udev_event_kernel) udev_evq; 126 static struct kqinfo udev_kq; 127 static struct lock udev_lk; 128 static int udev_evqlen; 129 static int udev_initiated_count; 130 static int udev_open_count; 131 static int udev_seqwait; 132 static int udev_seq; 133 134 static int 135 _udev_dict_set_cstr(prop_dictionary_t dict, const char *key, char *str) 136 { 137 prop_string_t ps; 138 139 KKASSERT(dict != NULL); 140 141 ps = prop_string_create_cstring(str); 142 if (ps == NULL) { 143 return ENOMEM; 144 } 145 146 if (prop_dictionary_set(dict, key, ps) == false) { 147 prop_object_release(ps); 148 return ENOMEM; 149 } 150 151 prop_object_release(ps); 152 return 0; 153 } 154 155 static int 156 _udev_dict_set_int(prop_dictionary_t dict, const char *key, int64_t val) 157 { 158 prop_number_t pn; 159 160 KKASSERT(dict != NULL); 161 162 pn = prop_number_create_integer(val); 163 if (pn == NULL) 164 return ENOMEM; 165 166 if (prop_dictionary_set(dict, key, pn) == false) { 167 prop_object_release(pn); 168 return ENOMEM; 169 } 170 171 prop_object_release(pn); 172 return 0; 173 } 174 175 static int 176 _udev_dict_set_uint(prop_dictionary_t dict, const char *key, uint64_t val) 177 { 178 prop_number_t pn; 179 180 KKASSERT(dict != NULL); 181 182 pn = prop_number_create_unsigned_integer(val); 183 if (pn == NULL) 184 return ENOMEM; 185 186 if (prop_dictionary_set(dict, key, pn) == false) { 187 prop_object_release(pn); 188 return ENOMEM; 189 } 190 191 prop_object_release(pn); 192 return 0; 193 } 194 195 static int 196 _udev_dict_delete_key(prop_dictionary_t dict, const char *key) 197 { 198 KKASSERT(dict != NULL); 199 200 prop_dictionary_remove(dict, key); 201 202 return 0; 203 } 204 205 /* 206 * Initialize an event dictionary, which contains three parameters to 207 * identify the device referred to (name, devnum, kptr) and the affected key. 208 */ 209 static prop_dictionary_t 210 udev_init_dict_event(cdev_t dev, const char *key) 211 { 212 prop_dictionary_t dict; 213 uint64_t kptr; 214 int error; 215 216 kptr = (uint64_t)(uintptr_t)dev; 217 KKASSERT(dev != NULL); 218 219 dict = prop_dictionary_create(); 220 if (dict == NULL) { 221 log(LOG_DEBUG, "udev_init_dict_event: prop_dictionary_create() failed\n"); 222 return NULL; 223 } 224 225 if ((error = _udev_dict_set_cstr(dict, "name", dev->si_name))) 226 goto error_out; 227 if ((error = _udev_dict_set_uint(dict, "devnum", dev->si_inode))) 228 goto error_out; 229 if ((error = _udev_dict_set_uint(dict, "devtype", (dev_dflags(dev) & D_TYPEMASK)))) 230 goto error_out; 231 if ((error = _udev_dict_set_uint(dict, "kptr", kptr))) 232 goto error_out; 233 if ((error = _udev_dict_set_cstr(dict, "key", __DECONST(char *, key)))) 234 goto error_out; 235 236 return dict; 237 238 error_out: 239 prop_object_release(dict); 240 return NULL; 241 } 242 243 int 244 udev_dict_set_cstr(cdev_t dev, const char *key, char *str) 245 { 246 prop_dictionary_t dict; 247 int error; 248 249 KKASSERT(dev != NULL); 250 251 if (dev->si_dict == NULL) { 252 error = udev_init_dict(dev); 253 if (error) 254 return -1; 255 } 256 257 /* Queue a key update event */ 258 dict = udev_init_dict_event(dev, key); 259 if (dict == NULL) 260 return ENOMEM; 261 262 if ((error = _udev_dict_set_cstr(dict, "value", str))) { 263 prop_object_release(dict); 264 return error; 265 } 266 udev_event_insert(UDEV_EV_KEY_UPDATE, dict); 267 prop_object_release(dict); 268 269 error = _udev_dict_set_cstr(dev->si_dict, key, str); 270 return error; 271 } 272 273 int 274 udev_dict_set_int(cdev_t dev, const char *key, int64_t val) 275 { 276 prop_dictionary_t dict; 277 int error; 278 279 KKASSERT(dev != NULL); 280 281 if (dev->si_dict == NULL) { 282 error = udev_init_dict(dev); 283 if (error) 284 return -1; 285 } 286 287 /* Queue a key update event */ 288 dict = udev_init_dict_event(dev, key); 289 if (dict == NULL) 290 return ENOMEM; 291 if ((error = _udev_dict_set_int(dict, "value", val))) { 292 prop_object_release(dict); 293 return error; 294 } 295 udev_event_insert(UDEV_EV_KEY_UPDATE, dict); 296 prop_object_release(dict); 297 298 return _udev_dict_set_int(dev->si_dict, key, val); 299 } 300 301 int 302 udev_dict_set_uint(cdev_t dev, const char *key, uint64_t val) 303 { 304 prop_dictionary_t dict; 305 int error; 306 307 KKASSERT(dev != NULL); 308 309 if (dev->si_dict == NULL) { 310 error = udev_init_dict(dev); 311 if (error) 312 return -1; 313 } 314 315 /* Queue a key update event */ 316 dict = udev_init_dict_event(dev, key); 317 if (dict == NULL) 318 return ENOMEM; 319 if ((error = _udev_dict_set_uint(dict, "value", val))) { 320 prop_object_release(dict); 321 return error; 322 } 323 udev_event_insert(UDEV_EV_KEY_UPDATE, dict); 324 prop_object_release(dict); 325 326 return _udev_dict_set_uint(dev->si_dict, key, val); 327 } 328 329 int 330 udev_dict_delete_key(cdev_t dev, const char *key) 331 { 332 prop_dictionary_t dict; 333 334 KKASSERT(dev != NULL); 335 336 /* Queue a key removal event */ 337 dict = udev_init_dict_event(dev, key); 338 if (dict == NULL) 339 return ENOMEM; 340 udev_event_insert(UDEV_EV_KEY_REMOVE, dict); 341 prop_object_release(dict); 342 343 return _udev_dict_delete_key(dev->si_dict, key); 344 } 345 346 static int 347 udev_init_dict(cdev_t dev) 348 { 349 prop_dictionary_t dict; 350 uint64_t kptr; 351 int error; 352 353 kptr = (uint64_t)(uintptr_t)dev; 354 355 KKASSERT(dev != NULL); 356 357 if (dev->si_dict != NULL) { 358 #if 0 359 log(LOG_DEBUG, 360 "udev_init_dict: new dict for %s, but has dict already (%p)!\n", 361 dev->si_name, dev->si_dict); 362 #endif 363 return 0; 364 } 365 366 dict = prop_dictionary_create(); 367 if (dict == NULL) { 368 log(LOG_DEBUG, "udev_init_dict: prop_dictionary_create() failed\n"); 369 return ENOMEM; 370 } 371 372 if ((error = _udev_dict_set_cstr(dict, "name", dev->si_name))) 373 goto error_out; 374 if ((error = _udev_dict_set_uint(dict, "devnum", dev->si_inode))) 375 goto error_out; 376 if ((error = _udev_dict_set_uint(dict, "kptr", kptr))) 377 goto error_out; 378 if ((error = _udev_dict_set_uint(dict, "devtype", (dev_dflags(dev) & D_TYPEMASK)))) 379 goto error_out; 380 381 /* XXX: The next 3 are marginallly useful, if at all */ 382 if ((error = _udev_dict_set_uint(dict, "uid", dev->si_uid))) 383 goto error_out; 384 if ((error = _udev_dict_set_uint(dict, "gid", dev->si_gid))) 385 goto error_out; 386 if ((error = _udev_dict_set_int(dict, "mode", dev->si_perms))) 387 goto error_out; 388 389 if ((error = _udev_dict_set_int(dict, "major", dev->si_umajor))) 390 goto error_out; 391 if ((error = _udev_dict_set_int(dict, "minor", dev->si_uminor))) 392 goto error_out; 393 if (dev->si_ops->head.name != NULL) { 394 if ((error = _udev_dict_set_cstr(dict, "driver", 395 __DECONST(char *, dev->si_ops->head.name)))) 396 goto error_out; 397 } 398 399 dev->si_dict = dict; 400 return 0; 401 402 error_out: 403 dev->si_dict = NULL; 404 prop_object_release(dict); 405 return error; 406 } 407 408 static int 409 udev_destroy_dict(cdev_t dev) 410 { 411 KKASSERT(dev != NULL); 412 413 if (dev->si_dict != NULL) { 414 prop_object_release(dev->si_dict); 415 dev->si_dict = NULL; 416 } 417 418 return 0; 419 } 420 421 static void 422 udev_event_insert(int ev_type, prop_dictionary_t dict) 423 { 424 struct udev_event_kernel *ev; 425 prop_dictionary_t dict_copy; 426 427 /* Only start queing events after client has initiated properly */ 428 if (udev_initiated_count) { 429 dict_copy = prop_dictionary_copy(dict); 430 if (dict_copy == NULL) 431 return; 432 ev = objcache_get(udev_event_kernel_cache, M_WAITOK); 433 ev->ev.ev_dict = dict_copy; 434 ev->ev.ev_type = ev_type; 435 436 lockmgr(&udev_lk, LK_EXCLUSIVE); 437 TAILQ_INSERT_TAIL(&udev_evq, ev, link); 438 ++udev_evqlen; 439 ++udev_seq; 440 if (udev_seqwait) 441 wakeup(&udev_seqwait); 442 lockmgr(&udev_lk, LK_RELEASE); 443 wakeup(&udev_evq); 444 KNOTE(&udev_kq.ki_note, 0); 445 } else if (udev_open_count) { 446 lockmgr(&udev_lk, LK_EXCLUSIVE); 447 ++udev_seq; 448 if (udev_seqwait) 449 wakeup(&udev_seqwait); 450 lockmgr(&udev_lk, LK_RELEASE); 451 KNOTE(&udev_kq.ki_note, 0); 452 } 453 } 454 455 static void 456 udev_clean_events_locked(void) 457 { 458 struct udev_event_kernel *ev; 459 460 while ((ev = TAILQ_FIRST(&udev_evq)) && 461 ev->ev.ev_dict != NULL) { 462 TAILQ_REMOVE(&udev_evq, ev, link); 463 objcache_put(udev_event_kernel_cache, ev); 464 --udev_evqlen; 465 } 466 } 467 468 static char * 469 udev_event_externalize(struct udev_event_kernel *ev) 470 { 471 prop_dictionary_t dict; 472 char *xml; 473 int error; 474 475 dict = prop_dictionary_create(); 476 if (dict == NULL) { 477 log(LOG_DEBUG, 478 "udev_event_externalize: prop_dictionary_create() failed\n"); 479 return NULL; 480 } 481 482 if ((error = _udev_dict_set_int(dict, "evtype", ev->ev.ev_type))) { 483 prop_object_release(dict); 484 return NULL; 485 } 486 487 if (prop_dictionary_set(dict, "evdict", ev->ev.ev_dict) == false) { 488 prop_object_release(dict); 489 return NULL; 490 } 491 492 prop_object_release(ev->ev.ev_dict); 493 494 xml = prop_dictionary_externalize(dict); 495 496 prop_object_release(dict); 497 498 return xml; 499 } 500 501 int 502 udev_event_attach(cdev_t dev, char *name, int alias) 503 { 504 prop_dictionary_t dict; 505 int error; 506 507 KKASSERT(dev != NULL); 508 509 error = ENOMEM; 510 511 if (alias) { 512 dict = prop_dictionary_copy(dev->si_dict); 513 if (dict == NULL) 514 goto error_out; 515 516 if ((error = _udev_dict_set_cstr(dict, "name", name))) { 517 prop_object_release(dict); 518 goto error_out; 519 } 520 521 _udev_dict_set_int(dict, "alias", 1); 522 523 udev_event_insert(UDEV_EVENT_ATTACH, dict); 524 prop_object_release(dict); 525 } else { 526 error = udev_init_dict(dev); 527 if (error) 528 goto error_out; 529 530 _udev_dict_set_int(dev->si_dict, "alias", 0); 531 udev_event_insert(UDEV_EVENT_ATTACH, dev->si_dict); 532 } 533 534 error_out: 535 return error; 536 } 537 538 int 539 udev_event_detach(cdev_t dev, char *name, int alias) 540 { 541 prop_dictionary_t dict; 542 543 KKASSERT(dev != NULL); 544 545 if (alias) { 546 dict = prop_dictionary_copy(dev->si_dict); 547 if (dict == NULL) 548 goto error_out; 549 550 if (_udev_dict_set_cstr(dict, "name", name)) { 551 prop_object_release(dict); 552 goto error_out; 553 } 554 555 _udev_dict_set_int(dict, "alias", 1); 556 557 udev_event_insert(UDEV_EVENT_DETACH, dict); 558 prop_object_release(dict); 559 } else { 560 udev_event_insert(UDEV_EVENT_DETACH, dev->si_dict); 561 } 562 563 error_out: 564 udev_destroy_dict(dev); 565 566 return 0; 567 } 568 569 /* 570 * Allow multiple opens. Each opener gets a different device. 571 * Messages are replicated to all devices using a marker system. 572 */ 573 static int 574 udev_dev_clone(struct dev_clone_args *ap) 575 { 576 struct udev_softc *softc; 577 int unit; 578 579 unit = devfs_clone_bitmap_get(&DEVFS_CLONE_BITMAP(udev), 1000); 580 if (unit < 0) { 581 ap->a_dev = NULL; 582 return 1; 583 } 584 585 softc = kmalloc(sizeof(*softc), M_UDEV, M_WAITOK | M_ZERO); 586 softc->unit = unit; 587 lockmgr(&udev_lk, LK_EXCLUSIVE); 588 TAILQ_INSERT_TAIL(&udevq, softc, entry); 589 lockmgr(&udev_lk, LK_RELEASE); 590 591 softc->dev = make_only_dev(&udev_dev_ops, unit, ap->a_cred->cr_ruid, 592 0, 0600, "udev/%d", unit); 593 softc->dev->si_drv1 = softc; 594 ap->a_dev = softc->dev; 595 return 0; 596 } 597 598 /* 599 * dev stuff 600 */ 601 static int 602 udev_dev_open(struct dev_open_args *ap) 603 { 604 struct udev_softc *softc = ap->a_head.a_dev->si_drv1; 605 606 lockmgr(&udev_lk, LK_EXCLUSIVE); 607 if (softc == NULL || softc->opened) { 608 lockmgr(&udev_lk, LK_RELEASE); 609 return EBUSY; 610 } 611 softc->opened = 1; 612 ++udev_open_count; 613 lockmgr(&udev_lk, LK_RELEASE); 614 615 return 0; 616 } 617 618 static int 619 udev_dev_close(struct dev_close_args *ap) 620 { 621 struct udev_softc *softc = ap->a_head.a_dev->si_drv1; 622 623 KKASSERT(softc->dev == ap->a_head.a_dev); 624 KKASSERT(softc->opened == 1); 625 626 lockmgr(&udev_lk, LK_EXCLUSIVE); 627 TAILQ_REMOVE(&udevq, softc, entry); 628 devfs_clone_bitmap_put(&DEVFS_CLONE_BITMAP(udev), softc->unit); 629 630 if (softc->initiated) { 631 TAILQ_REMOVE(&udev_evq, &softc->marker, link); 632 softc->initiated = 0; 633 --udev_initiated_count; 634 udev_clean_events_locked(); 635 } 636 softc->opened = 0; 637 softc->dev = NULL; 638 ap->a_head.a_dev->si_drv1 = NULL; 639 --udev_open_count; 640 lockmgr(&udev_lk, LK_RELEASE); 641 642 destroy_dev(ap->a_head.a_dev); 643 wakeup(&udev_evq); 644 645 kfree(softc, M_UDEV); 646 647 return 0; 648 } 649 650 static struct filterops udev_dev_read_filtops = 651 { FILTEROP_ISFD, NULL, udev_dev_filter_detach, udev_dev_filter_read }; 652 653 static int 654 udev_dev_kqfilter(struct dev_kqfilter_args *ap) 655 { 656 struct udev_softc *softc = ap->a_head.a_dev->si_drv1; 657 struct knote *kn = ap->a_kn; 658 struct klist *klist; 659 660 ap->a_result = 0; 661 lockmgr(&udev_lk, LK_EXCLUSIVE); 662 663 switch (kn->kn_filter) { 664 case EVFILT_READ: 665 kn->kn_fop = &udev_dev_read_filtops; 666 kn->kn_hook = (caddr_t)softc; 667 break; 668 default: 669 ap->a_result = EOPNOTSUPP; 670 lockmgr(&udev_lk, LK_RELEASE); 671 return (0); 672 } 673 674 klist = &udev_kq.ki_note; 675 knote_insert(klist, kn); 676 677 lockmgr(&udev_lk, LK_RELEASE); 678 679 return (0); 680 } 681 682 static void 683 udev_dev_filter_detach(struct knote *kn) 684 { 685 struct klist *klist; 686 687 lockmgr(&udev_lk, LK_EXCLUSIVE); 688 klist = &udev_kq.ki_note; 689 knote_remove(klist, kn); 690 lockmgr(&udev_lk, LK_RELEASE); 691 } 692 693 static int 694 udev_dev_filter_read(struct knote *kn, long hint) 695 { 696 struct udev_softc *softc = (void *)kn->kn_hook; 697 struct udev_event_kernel *ev; 698 int ready = 0; 699 700 lockmgr(&udev_lk, LK_EXCLUSIVE); 701 if (softc->initiated) { 702 ev = TAILQ_NEXT(&softc->marker, link); 703 while (ev && ev->ev.ev_dict == NULL) 704 ev = TAILQ_NEXT(ev, link); 705 if (ev) 706 ready = 1; 707 } 708 lockmgr(&udev_lk, LK_RELEASE); 709 710 return (ready); 711 } 712 713 static int 714 udev_dev_read(struct dev_read_args *ap) 715 { 716 struct udev_softc *softc = ap->a_head.a_dev->si_drv1; 717 struct udev_event_kernel *ev; 718 struct uio *uio = ap->a_uio; 719 char *xml; 720 size_t len; 721 int error; 722 723 lockmgr(&udev_lk, LK_EXCLUSIVE); 724 725 /* 726 * Automatically enable message collection if it has not already 727 * been enabled. 728 */ 729 if (softc->initiated == 0) { 730 softc->initiated = 1; 731 ++udev_initiated_count; 732 TAILQ_INSERT_HEAD(&udev_evq, &softc->marker, link); 733 } 734 735 /* 736 * Loop, sleep interruptably until we get an event or signal. 737 */ 738 error = 0; 739 for (;;) { 740 if (softc->initiated) { 741 ev = TAILQ_NEXT(&softc->marker, link); 742 while (ev && ev->ev.ev_dict == NULL) 743 ev = TAILQ_NEXT(ev, link); 744 if (ev) { 745 if ((xml = udev_event_externalize(ev)) == NULL) { 746 error = ENOMEM; 747 break; 748 } 749 len = strlen(xml) + 1; /* include terminator */ 750 if (uio->uio_resid < len) 751 error = ENOMEM; 752 else 753 error = uiomove((caddr_t)xml, len, uio); 754 kfree(xml, M_TEMP); 755 756 /* 757 * Move the marker 758 */ 759 TAILQ_REMOVE(&udev_evq, &softc->marker, link); 760 TAILQ_INSERT_AFTER(&udev_evq, 761 ev, &softc->marker, link); 762 udev_clean_events_locked(); 763 break; 764 } 765 } 766 if (ap->a_ioflag & IO_NDELAY) { 767 error = EWOULDBLOCK; 768 break; 769 } 770 if ((error = lksleep(&udev_evq, &udev_lk, PCATCH, "udevq", 0))) 771 break; 772 } 773 774 lockmgr(&udev_lk, LK_RELEASE); 775 return error; 776 } 777 778 static int 779 udev_dev_ioctl(struct dev_ioctl_args *ap) 780 { 781 struct udev_softc *softc = ap->a_head.a_dev->si_drv1; 782 prop_dictionary_t dict; 783 prop_object_t po; 784 prop_string_t ps; 785 struct plistref *pref; 786 int i, error; 787 int seq; 788 789 error = 0; 790 791 switch(ap->a_cmd) { 792 case UDEVPROP: 793 /* Use proplib(3) for userspace/kernel communication */ 794 pref = (struct plistref *)ap->a_data; 795 error = prop_dictionary_copyin_ioctl(pref, ap->a_cmd, &dict); 796 if (error) 797 return error; 798 799 po = prop_dictionary_get(dict, "command"); 800 if (po == NULL || prop_object_type(po) != PROP_TYPE_STRING) { 801 log(LOG_DEBUG, "udev: prop_dictionary_get() failed\n"); 802 prop_object_release(dict); 803 return EINVAL; 804 } 805 806 ps = po; 807 /* Handle cmd */ 808 for(i = 0; cmd_fn[i].cmd != NULL; i++) { 809 if (prop_string_equals_cstring(ps, cmd_fn[i].cmd)) 810 break; 811 } 812 813 if (cmd_fn[i].cmd != NULL) { 814 error = cmd_fn[i].fn(softc, pref, ap->a_cmd, dict); 815 } else { 816 error = EINVAL; 817 } 818 819 //prop_object_release(po); 820 prop_object_release(dict); 821 break; 822 case UDEVWAIT: 823 /* 824 * Wait for events based on sequence number. Updates 825 * sequence number for loop. 826 */ 827 lockmgr(&udev_lk, LK_EXCLUSIVE); 828 seq = *(int *)ap->a_data; 829 ++udev_seqwait; 830 while (seq == udev_seq) { 831 error = lksleep(&udev_seqwait, &udev_lk, 832 PCATCH, "udevw", 0); 833 if (error) 834 break; 835 } 836 --udev_seqwait; 837 *(int *)ap->a_data = udev_seq; 838 lockmgr(&udev_lk, LK_RELEASE); 839 break; 840 default: 841 error = ENOTTY; /* Inappropriate ioctl for device */ 842 break; 843 } 844 845 return(error); 846 } 847 848 static void 849 udev_getdevs_scan_callback(char *name, cdev_t cdev, bool is_alias, void *arg) 850 { 851 struct udev_prop_ctx *ctx = arg; 852 853 KKASSERT(arg != NULL); 854 855 if (cdev->si_dict == NULL) 856 return; 857 858 if (prop_array_add(ctx->cdevs, cdev->si_dict) == false) { 859 ctx->error = EINVAL; 860 return; 861 } 862 } 863 864 static int 865 udev_getdevs_ioctl(struct udev_softc *softc, struct plistref *pref, 866 u_long cmd, prop_dictionary_t dict) 867 { 868 prop_dictionary_t odict; 869 struct udev_prop_ctx ctx; 870 int error; 871 872 /* 873 * Ensure event notification is enabled before doing the devfs 874 * scan so nothing gets missed. 875 */ 876 lockmgr(&udev_lk, LK_EXCLUSIVE); 877 if (softc->initiated == 0) { 878 softc->initiated = 1; 879 ++udev_initiated_count; 880 TAILQ_INSERT_HEAD(&udev_evq, &softc->marker, link); 881 } 882 lockmgr(&udev_lk, LK_RELEASE); 883 884 /* 885 * Devfs scan to build full dictionary. 886 */ 887 ctx.error = 0; 888 ctx.cdevs = prop_array_create(); 889 if (ctx.cdevs == NULL) { 890 log(LOG_DEBUG, 891 "udev_getdevs_ioctl: prop_array_create() failed\n"); 892 return EINVAL; 893 } 894 895 devfs_scan_callback(udev_getdevs_scan_callback, &ctx); 896 897 if (ctx.error != 0) { 898 prop_object_release(ctx.cdevs); 899 return (ctx.error); 900 } 901 902 odict = prop_dictionary_create(); 903 if (odict == NULL) { 904 return ENOMEM; 905 } 906 907 if ((prop_dictionary_set(odict, "array", ctx.cdevs)) == 0) { 908 log(LOG_DEBUG, 909 "udev_getdevs_ioctl: prop_dictionary_set failed\n"); 910 prop_object_release(odict); 911 return ENOMEM; 912 } 913 914 error = prop_dictionary_copyout_ioctl(pref, cmd, odict); 915 916 prop_object_release(odict); 917 return error; 918 } 919 920 921 /* 922 * SYSINIT stuff 923 */ 924 static void 925 udev_init(void) 926 { 927 lockinit(&udev_lk, "udevlk", 0, LK_CANRECURSE); 928 TAILQ_INIT(&udevq); 929 TAILQ_INIT(&udev_evq); 930 udev_event_kernel_cache = objcache_create_simple(M_UDEV, sizeof(struct udev_event_kernel)); 931 } 932 933 static void 934 udev_uninit(void) 935 { 936 objcache_destroy(udev_event_kernel_cache); 937 } 938 939 static void 940 udev_dev_init(void) 941 { 942 udev_dev = make_autoclone_dev(&udev_dev_ops, &DEVFS_CLONE_BITMAP(udev), 943 udev_dev_clone, 944 UID_ROOT, GID_WHEEL, 0600, "udev"); 945 } 946 947 static void 948 udev_dev_uninit(void) 949 { 950 destroy_dev(udev_dev); 951 } 952 953 SYSINIT(subr_udev_register, SI_SUB_CREATE_INIT, SI_ORDER_ANY, 954 udev_init, NULL); 955 SYSUNINIT(subr_udev_register, SI_SUB_CREATE_INIT, SI_ORDER_ANY, 956 udev_uninit, NULL); 957 SYSINIT(subr_udev_dev_register, SI_SUB_DRIVERS, SI_ORDER_ANY, 958 udev_dev_init, NULL); 959 SYSUNINIT(subr_udev_dev_register, SI_SUB_DRIVERS, SI_ORDER_ANY, 960 udev_dev_uninit, NULL); 961