sys/kern/kern_udev.c

   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/ctype.h>
  44 #include <sys/syslog.h>
  45 #include <sys/udev.h>
  46 #include <sys/devfs.h>
  47 #include <libprop/proplib.h>
  48
  49 #include <sys/thread2.h>
  50
  51 MALLOC_DEFINE(M_UDEV, "udev", "udev allocs");
  52
  53 /* XXX: use UUIDs for identification; would need help from devfs */
  54
  55 static cdev_t           udev_dev;
  56 static d_open_t         udev_dev_open;
  57 static d_close_t        udev_dev_close;
  58 static d_read_t         udev_dev_read;
  59 static d_kqfilter_t     udev_dev_kqfilter;
  60 static d_ioctl_t        udev_dev_ioctl;
  61 static d_clone_t        udev_dev_clone;
  62
  63 struct udev_prop_ctx {
  64         prop_array_t cdevs;
  65         int error;
  66 };
  67
  68 struct udev_event_kernel {
  69         struct udev_event ev;
  70         TAILQ_ENTRY(udev_event_kernel)  link;
  71 };
  72
  73 struct udev_softc {
  74         TAILQ_ENTRY(udev_softc) entry;
  75         int opened;
  76         int initiated;
  77         int unit;
  78         cdev_t dev;
  79
  80         struct udev_event_kernel marker;        /* udev_evq marker */
  81 };
  82
  83 struct cmd_function {
  84         const char *cmd;
  85         int  (*fn)(struct udev_softc *, struct plistref *,
  86                    u_long, prop_dictionary_t);
  87 };
  88
  89
  90 static int _udev_dict_set_cstr(prop_dictionary_t, const char *, char *);
  91 static int _udev_dict_set_int(prop_dictionary_t, const char *, int64_t);
  92 static int _udev_dict_set_uint(prop_dictionary_t, const char *, uint64_t);
  93 static int _udev_dict_delete_key(prop_dictionary_t, const char *);
  94 static prop_dictionary_t udev_init_dict_event(cdev_t, const char *);
  95 static int udev_init_dict(cdev_t);
  96 static int udev_destroy_dict(cdev_t);
  97 static void udev_event_insert(int, prop_dictionary_t);
  98 static void udev_clean_events_locked(void);
  99 static char *udev_event_externalize(struct udev_event_kernel *);
 100 static void udev_getdevs_scan_callback(char *, cdev_t, bool, void *);
 101 static int udev_getdevs_ioctl(struct udev_softc *, struct plistref *,
 102                                         u_long, prop_dictionary_t);
 103 static void udev_dev_filter_detach(struct knote *);
 104 static int udev_dev_filter_read(struct knote *, long);
 105
 106 static struct dev_ops udev_dev_ops = {
 107         { "udev", 0, 0 },
 108         .d_open = udev_dev_open,
 109         .d_close = udev_dev_close,
 110         .d_read = udev_dev_read,
 111         .d_kqfilter = udev_dev_kqfilter,
 112         .d_ioctl = udev_dev_ioctl
 113 };
 114
 115 static struct cmd_function cmd_fn[] = {
 116                 { .cmd = "getdevs", .fn = udev_getdevs_ioctl},
 117                 {NULL, NULL}
 118 };
 119
 120 DEVFS_DECLARE_CLONE_BITMAP(udev);
 121
 122 static TAILQ_HEAD(, udev_softc) udevq;
 123 static TAILQ_HEAD(, udev_event_kernel) udev_evq;
 124 static struct kqinfo udev_kq;
 125 static struct lock udev_lk;
 126 static int udev_evqlen;
 127 static int udev_initiated_count;
 128 static int udev_open_count;
 129 static int udev_seqwait;
 130 static int udev_seq;
 131
 132 static int
 133 _udev_dict_set_cstr(prop_dictionary_t dict, const char *key, char *str)
 134 {
 135         prop_string_t   ps;
 136
 137         KKASSERT(dict != NULL);
 138
 139         ps = prop_string_create_cstring(str);
 140         if (ps == NULL) {
 141                 return ENOMEM;
 142         }
 143
 144         if (prop_dictionary_set(dict, key, ps) == false) {
 145                 prop_object_release(ps);
 146                 return ENOMEM;
 147         }
 148
 149         prop_object_release(ps);
 150         return 0;
 151 }
 152
 153 static int
 154 _udev_dict_set_int(prop_dictionary_t dict, const char *key, int64_t val)
 155 {
 156         prop_number_t   pn;
 157
 158         KKASSERT(dict != NULL);
 159
 160         pn = prop_number_create_integer(val);
 161         if (pn == NULL)
 162                 return ENOMEM;
 163
 164         if (prop_dictionary_set(dict, key, pn) == false) {
 165                 prop_object_release(pn);
 166                 return ENOMEM;
 167         }
 168
 169         prop_object_release(pn);
 170         return 0;
 171 }
 172
 173 static int
 174 _udev_dict_set_uint(prop_dictionary_t dict, const char *key, uint64_t val)
 175 {
 176         prop_number_t   pn;
 177
 178         KKASSERT(dict != NULL);
 179
 180         pn = prop_number_create_unsigned_integer(val);
 181         if (pn == NULL)
 182                 return ENOMEM;
 183
 184         if (prop_dictionary_set(dict, key, pn) == false) {
 185                 prop_object_release(pn);
 186                 return ENOMEM;
 187         }
 188
 189         prop_object_release(pn);
 190         return 0;
 191 }
 192
 193 static int
 194 _udev_dict_delete_key(prop_dictionary_t dict, const char *key)
 195 {
 196         KKASSERT(dict != NULL);
 197
 198         prop_dictionary_remove(dict, key);
 199
 200         return 0;
 201 }
 202
 203 /*
 204  * Initialize an event dictionary, which contains three parameters to
 205  * identify the device referred to (name, devnum, kptr) and the affected key.
 206  */
 207 static prop_dictionary_t
 208 udev_init_dict_event(cdev_t dev, const char *key)
 209 {
 210         prop_dictionary_t       dict;
 211         uint64_t        kptr;
 212         int error;
 213
 214         kptr = (uint64_t)(uintptr_t)dev;
 215         KKASSERT(dev != NULL);
 216
 217         dict = prop_dictionary_create();
 218         if (dict == NULL) {
 219                 log(LOG_DEBUG, "udev_init_dict_event: prop_dictionary_create() failed\n");
 220                 return NULL;
 221         }
 222
 223         if ((error = _udev_dict_set_cstr(dict, "name", dev->si_name)))
 224                 goto error_out;
 225         if ((error = _udev_dict_set_uint(dict, "devnum", dev->si_inode)))
 226                 goto error_out;
 227         if ((error = _udev_dict_set_uint(dict, "devtype", (dev_dflags(dev) & D_TYPEMASK))))
 228                 goto error_out;
 229         if ((error = _udev_dict_set_uint(dict, "kptr", kptr)))
 230                 goto error_out;
 231         if ((error = _udev_dict_set_cstr(dict, "key", __DECONST(char *, key))))
 232                 goto error_out;
 233
 234         return dict;
 235
 236 error_out:
 237         prop_object_release(dict);
 238         return NULL;
 239 }
 240
 241 int
 242 udev_dict_set_cstr(cdev_t dev, const char *key, char *str)
 243 {
 244         prop_dictionary_t       dict;
 245         int error;
 246
 247         KKASSERT(dev != NULL);
 248
 249         if (dev->si_dict == NULL) {
 250                 error = udev_init_dict(dev);
 251                 if (error)
 252                         return -1;
 253         }
 254
 255         /* Queue a key update event */
 256         dict = udev_init_dict_event(dev, key);
 257         if (dict == NULL)
 258                 return ENOMEM;
 259
 260         if ((error = _udev_dict_set_cstr(dict, "value", str))) {
 261                 prop_object_release(dict);
 262                 return error;
 263         }
 264         udev_event_insert(UDEV_EV_KEY_UPDATE, dict);
 265         prop_object_release(dict);
 266
 267         error = _udev_dict_set_cstr(dev->si_dict, key, str);
 268         return error;
 269 }
 270
 271 int
 272 udev_dict_set_int(cdev_t dev, const char *key, int64_t val)
 273 {
 274         prop_dictionary_t       dict;
 275         int error;
 276
 277         KKASSERT(dev != NULL);
 278
 279         if (dev->si_dict == NULL) {
 280                 error = udev_init_dict(dev);
 281                 if (error)
 282                         return -1;
 283         }
 284
 285         /* Queue a key update event */
 286         dict = udev_init_dict_event(dev, key);
 287         if (dict == NULL)
 288                 return ENOMEM;
 289         if ((error = _udev_dict_set_int(dict, "value", val))) {
 290                 prop_object_release(dict);
 291                 return error;
 292         }
 293         udev_event_insert(UDEV_EV_KEY_UPDATE, dict);
 294         prop_object_release(dict);
 295
 296         return _udev_dict_set_int(dev->si_dict, key, val);
 297 }
 298
 299 int
 300 udev_dict_set_uint(cdev_t dev, const char *key, uint64_t val)
 301 {
 302         prop_dictionary_t       dict;
 303         int error;
 304
 305         KKASSERT(dev != NULL);
 306
 307         if (dev->si_dict == NULL) {
 308                 error = udev_init_dict(dev);
 309                 if (error)
 310                         return -1;
 311         }
 312
 313         /* Queue a key update event */
 314         dict = udev_init_dict_event(dev, key);
 315         if (dict == NULL)
 316                 return ENOMEM;
 317         if ((error = _udev_dict_set_uint(dict, "value", val))) {
 318                 prop_object_release(dict);
 319                 return error;
 320         }
 321         udev_event_insert(UDEV_EV_KEY_UPDATE, dict);
 322         prop_object_release(dict);
 323
 324         return _udev_dict_set_uint(dev->si_dict, key, val);
 325 }
 326
 327 int
 328 udev_dict_delete_key(cdev_t dev, const char *key)
 329 {
 330         prop_dictionary_t       dict;
 331
 332         KKASSERT(dev != NULL);
 333
 334         /* Queue a key removal event */
 335         dict = udev_init_dict_event(dev, key);
 336         if (dict == NULL)
 337                 return ENOMEM;
 338         udev_event_insert(UDEV_EV_KEY_REMOVE, dict);
 339         prop_object_release(dict);
 340
 341         return _udev_dict_delete_key(dev->si_dict, key);
 342 }
 343
 344 static int
 345 udev_init_dict(cdev_t dev)
 346 {
 347         prop_dictionary_t dict;
 348         uint64_t        kptr;
 349         int error;
 350
 351         kptr = (uint64_t)(uintptr_t)dev;
 352
 353         KKASSERT(dev != NULL);
 354
 355         if (dev->si_dict != NULL) {
 356 #if 0
 357                 log(LOG_DEBUG,
 358                     "udev_init_dict: new dict for %s, but has dict already (%p)!\n",
 359                     dev->si_name, dev->si_dict);
 360 #endif
 361                 return 0;
 362         }
 363
 364         dict = prop_dictionary_create();
 365         if (dict == NULL) {
 366                 log(LOG_DEBUG, "udev_init_dict: prop_dictionary_create() failed\n");
 367                 return ENOMEM;
 368         }
 369
 370         if ((error = _udev_dict_set_cstr(dict, "name", dev->si_name)))
 371                 goto error_out;
 372         if ((error = _udev_dict_set_uint(dict, "devnum", dev->si_inode)))
 373                 goto error_out;
 374         if ((error = _udev_dict_set_uint(dict, "kptr", kptr)))
 375                 goto error_out;
 376         if ((error = _udev_dict_set_uint(dict, "devtype", (dev_dflags(dev) & D_TYPEMASK))))
 377                 goto error_out;
 378
 379         /* XXX: The next 3 are marginallly useful, if at all */
 380         if ((error = _udev_dict_set_uint(dict, "uid", dev->si_uid)))
 381                 goto error_out;
 382         if ((error = _udev_dict_set_uint(dict, "gid", dev->si_gid)))
 383                 goto error_out;
 384         if ((error = _udev_dict_set_int(dict, "mode", dev->si_perms)))
 385                 goto error_out;
 386
 387         if ((error = _udev_dict_set_int(dict, "major", dev->si_umajor)))
 388                 goto error_out;
 389         if ((error = _udev_dict_set_int(dict, "minor", dev->si_uminor)))
 390                 goto error_out;
 391         if (dev->si_ops->head.name != NULL) {
 392                 if ((error = _udev_dict_set_cstr(dict, "driver",
 393                     __DECONST(char *, dev->si_ops->head.name))))
 394                         goto error_out;
 395         }
 396
 397         dev->si_dict = dict;
 398         return 0;
 399
 400 error_out:
 401         dev->si_dict = NULL;
 402         prop_object_release(dict);
 403         return error;
 404 }
 405
 406 static int
 407 udev_destroy_dict(cdev_t dev)
 408 {
 409         KKASSERT(dev != NULL);
 410
 411         if (dev->si_dict != NULL) {
 412                 prop_object_release(dev->si_dict);
 413                 dev->si_dict = NULL;
 414         }
 415
 416         return 0;
 417 }
 418
 419 static void
 420 udev_event_insert(int ev_type, prop_dictionary_t dict)
 421 {
 422         struct udev_event_kernel *ev;
 423
 424         /* Only start queing events after client has initiated properly */
 425         if (udev_initiated_count) {
 426                 /* XXX: use objcache eventually */
 427                 ev = kmalloc(sizeof(*ev), M_UDEV, M_WAITOK);
 428                 ev->ev.ev_dict = prop_dictionary_copy(dict);
 429                 if (ev->ev.ev_dict == NULL) {
 430                         kfree(ev, M_UDEV);
 431                         return;
 432                 }
 433                 ev->ev.ev_type = ev_type;
 434
 435                 lockmgr(&udev_lk, LK_EXCLUSIVE);
 436                 TAILQ_INSERT_TAIL(&udev_evq, ev, link);
 437                 ++udev_evqlen;
 438                 ++udev_seq;
 439                 if (udev_seqwait)
 440                         wakeup(&udev_seqwait);
 441                 lockmgr(&udev_lk, LK_RELEASE);
 442                 wakeup(&udev_evq);
 443                 KNOTE(&udev_kq.ki_note, 0);
 444         } else if (udev_open_count) {
 445                 lockmgr(&udev_lk, LK_EXCLUSIVE);
 446                 ++udev_seq;
 447                 if (udev_seqwait)
 448                         wakeup(&udev_seqwait);
 449                 lockmgr(&udev_lk, LK_RELEASE);
 450                 KNOTE(&udev_kq.ki_note, 0);
 451         }
 452 }
 453
 454 static void
 455 udev_clean_events_locked(void)
 456 {
 457         struct udev_event_kernel *ev;
 458
 459         while ((ev = TAILQ_FIRST(&udev_evq)) &&
 460                ev->ev.ev_dict != NULL) {
 461                 TAILQ_REMOVE(&udev_evq, ev, link);
 462                 kfree(ev, M_UDEV);
 463                 --udev_evqlen;
 464         }
 465 }
 466
 467 static char *
 468 udev_event_externalize(struct udev_event_kernel *ev)
 469 {
 470         prop_dictionary_t       dict;
 471         char *xml;
 472         int error;
 473
 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 }
 931
 932 static void
 933 udev_uninit(void)
 934 {
 935 }
 936
 937 static void
 938 udev_dev_init(void)
 939 {
 940         udev_dev = make_autoclone_dev(&udev_dev_ops, &DEVFS_CLONE_BITMAP(udev),
 941                                       udev_dev_clone,
 942                                       UID_ROOT, GID_WHEEL, 0600, "udev");
 943 }
 944
 945 static void
 946 udev_dev_uninit(void)
 947 {
 948         destroy_dev(udev_dev);
 949 }
 950
 951 SYSINIT(subr_udev_register, SI_SUB_CREATE_INIT, SI_ORDER_ANY,
 952         udev_init, NULL);
 953 SYSUNINIT(subr_udev_register, SI_SUB_CREATE_INIT, SI_ORDER_ANY,
 954         udev_uninit, NULL);
 955 SYSINIT(subr_udev_dev_register, SI_SUB_DRIVERS, SI_ORDER_ANY,
 956         udev_dev_init, NULL);
 957 SYSUNINIT(subr_udev_dev_register, SI_SUB_DRIVERS, SI_ORDER_ANY,
 958         udev_dev_uninit, NULL);