subr_autoconf.c revision 1.223.2.5
1 /* $NetBSD: subr_autoconf.c,v 1.223.2.5 2017/12/03 11:38:45 jdolecek Exp $ */ 2 3 /* 4 * Copyright (c) 1996, 2000 Christopher G. Demetriou 5 * All rights reserved. 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 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed for the 18 * NetBSD Project. See http://www.NetBSD.org/ for 19 * information about NetBSD. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 * 34 * --(license Id: LICENSE.proto,v 1.1 2000/06/13 21:40:26 cgd Exp )-- 35 */ 36 37 /* 38 * Copyright (c) 1992, 1993 39 * The Regents of the University of California. All rights reserved. 40 * 41 * This software was developed by the Computer Systems Engineering group 42 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 43 * contributed to Berkeley. 44 * 45 * All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Lawrence Berkeley Laboratories. 49 * 50 * Redistribution and use in source and binary forms, with or without 51 * modification, are permitted provided that the following conditions 52 * are met: 53 * 1. Redistributions of source code must retain the above copyright 54 * notice, this list of conditions and the following disclaimer. 55 * 2. Redistributions in binary form must reproduce the above copyright 56 * notice, this list of conditions and the following disclaimer in the 57 * documentation and/or other materials provided with the distribution. 58 * 3. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 * from: Header: subr_autoconf.c,v 1.12 93/02/01 19:31:48 torek Exp (LBL) 75 * 76 * @(#)subr_autoconf.c 8.3 (Berkeley) 5/17/94 77 */ 78 79 #include <sys/cdefs.h> 80 __KERNEL_RCSID(0, "$NetBSD: subr_autoconf.c,v 1.223.2.5 2017/12/03 11:38:45 jdolecek Exp $"); 81 82 #ifdef _KERNEL_OPT 83 #include "opt_ddb.h" 84 #include "drvctl.h" 85 #endif 86 87 #include <sys/param.h> 88 #include <sys/device.h> 89 #include <sys/disklabel.h> 90 #include <sys/conf.h> 91 #include <sys/kauth.h> 92 #include <sys/kmem.h> 93 #include <sys/systm.h> 94 #include <sys/kernel.h> 95 #include <sys/errno.h> 96 #include <sys/proc.h> 97 #include <sys/reboot.h> 98 #include <sys/kthread.h> 99 #include <sys/buf.h> 100 #include <sys/dirent.h> 101 #include <sys/mount.h> 102 #include <sys/namei.h> 103 #include <sys/unistd.h> 104 #include <sys/fcntl.h> 105 #include <sys/lockf.h> 106 #include <sys/callout.h> 107 #include <sys/devmon.h> 108 #include <sys/cpu.h> 109 #include <sys/sysctl.h> 110 111 #include <sys/disk.h> 112 113 #include <sys/rndsource.h> 114 115 #include <machine/limits.h> 116 117 /* 118 * Autoconfiguration subroutines. 119 */ 120 121 /* 122 * Device autoconfiguration timings are mixed into the entropy pool. 123 */ 124 extern krndsource_t rnd_autoconf_source; 125 126 /* 127 * ioconf.c exports exactly two names: cfdata and cfroots. All system 128 * devices and drivers are found via these tables. 129 */ 130 extern struct cfdata cfdata[]; 131 extern const short cfroots[]; 132 133 /* 134 * List of all cfdriver structures. We use this to detect duplicates 135 * when other cfdrivers are loaded. 136 */ 137 struct cfdriverlist allcfdrivers = LIST_HEAD_INITIALIZER(&allcfdrivers); 138 extern struct cfdriver * const cfdriver_list_initial[]; 139 140 /* 141 * Initial list of cfattach's. 142 */ 143 extern const struct cfattachinit cfattachinit[]; 144 145 /* 146 * List of cfdata tables. We always have one such list -- the one 147 * built statically when the kernel was configured. 148 */ 149 struct cftablelist allcftables = TAILQ_HEAD_INITIALIZER(allcftables); 150 static struct cftable initcftable; 151 152 #define ROOT ((device_t)NULL) 153 154 struct matchinfo { 155 cfsubmatch_t fn; 156 device_t parent; 157 const int *locs; 158 void *aux; 159 struct cfdata *match; 160 int pri; 161 }; 162 163 struct alldevs_foray { 164 int af_s; 165 struct devicelist af_garbage; 166 }; 167 168 static char *number(char *, int); 169 static void mapply(struct matchinfo *, cfdata_t); 170 static device_t config_devalloc(const device_t, const cfdata_t, const int *); 171 static void config_devdelete(device_t); 172 static void config_devunlink(device_t, struct devicelist *); 173 static void config_makeroom(int, struct cfdriver *); 174 static void config_devlink(device_t); 175 static void config_alldevs_enter(struct alldevs_foray *); 176 static void config_alldevs_exit(struct alldevs_foray *); 177 static void config_add_attrib_dict(device_t); 178 179 static void config_collect_garbage(struct devicelist *); 180 static void config_dump_garbage(struct devicelist *); 181 182 static void pmflock_debug(device_t, const char *, int); 183 184 static device_t deviter_next1(deviter_t *); 185 static void deviter_reinit(deviter_t *); 186 187 struct deferred_config { 188 TAILQ_ENTRY(deferred_config) dc_queue; 189 device_t dc_dev; 190 void (*dc_func)(device_t); 191 }; 192 193 TAILQ_HEAD(deferred_config_head, deferred_config); 194 195 struct deferred_config_head deferred_config_queue = 196 TAILQ_HEAD_INITIALIZER(deferred_config_queue); 197 struct deferred_config_head interrupt_config_queue = 198 TAILQ_HEAD_INITIALIZER(interrupt_config_queue); 199 int interrupt_config_threads = 8; 200 struct deferred_config_head mountroot_config_queue = 201 TAILQ_HEAD_INITIALIZER(mountroot_config_queue); 202 int mountroot_config_threads = 2; 203 static lwp_t **mountroot_config_lwpids; 204 static size_t mountroot_config_lwpids_size; 205 static bool root_is_mounted = false; 206 207 static void config_process_deferred(struct deferred_config_head *, device_t); 208 209 /* Hooks to finalize configuration once all real devices have been found. */ 210 struct finalize_hook { 211 TAILQ_ENTRY(finalize_hook) f_list; 212 int (*f_func)(device_t); 213 device_t f_dev; 214 }; 215 static TAILQ_HEAD(, finalize_hook) config_finalize_list = 216 TAILQ_HEAD_INITIALIZER(config_finalize_list); 217 static int config_finalize_done; 218 219 /* list of all devices */ 220 static struct { 221 kmutex_t lock; 222 struct devicelist list; 223 devgen_t gen; 224 int nread; 225 int nwrite; 226 bool garbage; 227 } alldevs __cacheline_aligned = { 228 .list = TAILQ_HEAD_INITIALIZER(alldevs.list), 229 .gen = 1, 230 .nread = 0, 231 .nwrite = 0, 232 .garbage = false, 233 }; 234 235 static int config_pending; /* semaphore for mountroot */ 236 static kmutex_t config_misc_lock; 237 static kcondvar_t config_misc_cv; 238 239 static bool detachall = false; 240 241 #define STREQ(s1, s2) \ 242 (*(s1) == *(s2) && strcmp((s1), (s2)) == 0) 243 244 static bool config_initialized = false; /* config_init() has been called. */ 245 246 static int config_do_twiddle; 247 static callout_t config_twiddle_ch; 248 249 static void sysctl_detach_setup(struct sysctllog **); 250 251 int no_devmon_insert(const char *, prop_dictionary_t); 252 int (*devmon_insert_vec)(const char *, prop_dictionary_t) = no_devmon_insert; 253 254 typedef int (*cfdriver_fn)(struct cfdriver *); 255 static int 256 frob_cfdrivervec(struct cfdriver * const *cfdriverv, 257 cfdriver_fn drv_do, cfdriver_fn drv_undo, 258 const char *style, bool dopanic) 259 { 260 void (*pr)(const char *, ...) __printflike(1, 2) = 261 dopanic ? panic : printf; 262 int i, error = 0, e2 __diagused; 263 264 for (i = 0; cfdriverv[i] != NULL; i++) { 265 if ((error = drv_do(cfdriverv[i])) != 0) { 266 pr("configure: `%s' driver %s failed: %d", 267 cfdriverv[i]->cd_name, style, error); 268 goto bad; 269 } 270 } 271 272 KASSERT(error == 0); 273 return 0; 274 275 bad: 276 printf("\n"); 277 for (i--; i >= 0; i--) { 278 e2 = drv_undo(cfdriverv[i]); 279 KASSERT(e2 == 0); 280 } 281 282 return error; 283 } 284 285 typedef int (*cfattach_fn)(const char *, struct cfattach *); 286 static int 287 frob_cfattachvec(const struct cfattachinit *cfattachv, 288 cfattach_fn att_do, cfattach_fn att_undo, 289 const char *style, bool dopanic) 290 { 291 const struct cfattachinit *cfai = NULL; 292 void (*pr)(const char *, ...) __printflike(1, 2) = 293 dopanic ? panic : printf; 294 int j = 0, error = 0, e2 __diagused; 295 296 for (cfai = &cfattachv[0]; cfai->cfai_name != NULL; cfai++) { 297 for (j = 0; cfai->cfai_list[j] != NULL; j++) { 298 if ((error = att_do(cfai->cfai_name, 299 cfai->cfai_list[j])) != 0) { 300 pr("configure: attachment `%s' " 301 "of `%s' driver %s failed: %d", 302 cfai->cfai_list[j]->ca_name, 303 cfai->cfai_name, style, error); 304 goto bad; 305 } 306 } 307 } 308 309 KASSERT(error == 0); 310 return 0; 311 312 bad: 313 /* 314 * Rollback in reverse order. dunno if super-important, but 315 * do that anyway. Although the code looks a little like 316 * someone did a little integration (in the math sense). 317 */ 318 printf("\n"); 319 if (cfai) { 320 bool last; 321 322 for (last = false; last == false; ) { 323 if (cfai == &cfattachv[0]) 324 last = true; 325 for (j--; j >= 0; j--) { 326 e2 = att_undo(cfai->cfai_name, 327 cfai->cfai_list[j]); 328 KASSERT(e2 == 0); 329 } 330 if (!last) { 331 cfai--; 332 for (j = 0; cfai->cfai_list[j] != NULL; j++) 333 ; 334 } 335 } 336 } 337 338 return error; 339 } 340 341 /* 342 * Initialize the autoconfiguration data structures. Normally this 343 * is done by configure(), but some platforms need to do this very 344 * early (to e.g. initialize the console). 345 */ 346 void 347 config_init(void) 348 { 349 350 KASSERT(config_initialized == false); 351 352 mutex_init(&alldevs.lock, MUTEX_DEFAULT, IPL_VM); 353 354 mutex_init(&config_misc_lock, MUTEX_DEFAULT, IPL_NONE); 355 cv_init(&config_misc_cv, "cfgmisc"); 356 357 callout_init(&config_twiddle_ch, CALLOUT_MPSAFE); 358 359 frob_cfdrivervec(cfdriver_list_initial, 360 config_cfdriver_attach, NULL, "bootstrap", true); 361 frob_cfattachvec(cfattachinit, 362 config_cfattach_attach, NULL, "bootstrap", true); 363 364 initcftable.ct_cfdata = cfdata; 365 TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list); 366 367 config_initialized = true; 368 } 369 370 /* 371 * Init or fini drivers and attachments. Either all or none 372 * are processed (via rollback). It would be nice if this were 373 * atomic to outside consumers, but with the current state of 374 * locking ... 375 */ 376 int 377 config_init_component(struct cfdriver * const *cfdriverv, 378 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 379 { 380 int error; 381 382 if ((error = frob_cfdrivervec(cfdriverv, 383 config_cfdriver_attach, config_cfdriver_detach, "init", false))!= 0) 384 return error; 385 if ((error = frob_cfattachvec(cfattachv, 386 config_cfattach_attach, config_cfattach_detach, 387 "init", false)) != 0) { 388 frob_cfdrivervec(cfdriverv, 389 config_cfdriver_detach, NULL, "init rollback", true); 390 return error; 391 } 392 if ((error = config_cfdata_attach(cfdatav, 1)) != 0) { 393 frob_cfattachvec(cfattachv, 394 config_cfattach_detach, NULL, "init rollback", true); 395 frob_cfdrivervec(cfdriverv, 396 config_cfdriver_detach, NULL, "init rollback", true); 397 return error; 398 } 399 400 return 0; 401 } 402 403 int 404 config_fini_component(struct cfdriver * const *cfdriverv, 405 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 406 { 407 int error; 408 409 if ((error = config_cfdata_detach(cfdatav)) != 0) 410 return error; 411 if ((error = frob_cfattachvec(cfattachv, 412 config_cfattach_detach, config_cfattach_attach, 413 "fini", false)) != 0) { 414 if (config_cfdata_attach(cfdatav, 0) != 0) 415 panic("config_cfdata fini rollback failed"); 416 return error; 417 } 418 if ((error = frob_cfdrivervec(cfdriverv, 419 config_cfdriver_detach, config_cfdriver_attach, 420 "fini", false)) != 0) { 421 frob_cfattachvec(cfattachv, 422 config_cfattach_attach, NULL, "fini rollback", true); 423 if (config_cfdata_attach(cfdatav, 0) != 0) 424 panic("config_cfdata fini rollback failed"); 425 return error; 426 } 427 428 return 0; 429 } 430 431 void 432 config_init_mi(void) 433 { 434 435 if (!config_initialized) 436 config_init(); 437 438 sysctl_detach_setup(NULL); 439 } 440 441 void 442 config_deferred(device_t dev) 443 { 444 config_process_deferred(&deferred_config_queue, dev); 445 config_process_deferred(&interrupt_config_queue, dev); 446 config_process_deferred(&mountroot_config_queue, dev); 447 } 448 449 static void 450 config_interrupts_thread(void *cookie) 451 { 452 struct deferred_config *dc; 453 454 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 455 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 456 (*dc->dc_func)(dc->dc_dev); 457 config_pending_decr(dc->dc_dev); 458 kmem_free(dc, sizeof(*dc)); 459 } 460 kthread_exit(0); 461 } 462 463 void 464 config_create_interruptthreads(void) 465 { 466 int i; 467 468 for (i = 0; i < interrupt_config_threads; i++) { 469 (void)kthread_create(PRI_NONE, 0, NULL, 470 config_interrupts_thread, NULL, NULL, "configintr"); 471 } 472 } 473 474 static void 475 config_mountroot_thread(void *cookie) 476 { 477 struct deferred_config *dc; 478 479 while ((dc = TAILQ_FIRST(&mountroot_config_queue)) != NULL) { 480 TAILQ_REMOVE(&mountroot_config_queue, dc, dc_queue); 481 (*dc->dc_func)(dc->dc_dev); 482 kmem_free(dc, sizeof(*dc)); 483 } 484 kthread_exit(0); 485 } 486 487 void 488 config_create_mountrootthreads(void) 489 { 490 int i; 491 492 if (!root_is_mounted) 493 root_is_mounted = true; 494 495 mountroot_config_lwpids_size = sizeof(mountroot_config_lwpids) * 496 mountroot_config_threads; 497 mountroot_config_lwpids = kmem_alloc(mountroot_config_lwpids_size, 498 KM_NOSLEEP); 499 KASSERT(mountroot_config_lwpids); 500 for (i = 0; i < mountroot_config_threads; i++) { 501 mountroot_config_lwpids[i] = 0; 502 (void)kthread_create(PRI_NONE, KTHREAD_MUSTJOIN, NULL, 503 config_mountroot_thread, NULL, 504 &mountroot_config_lwpids[i], 505 "configroot"); 506 } 507 } 508 509 void 510 config_finalize_mountroot(void) 511 { 512 int i, error; 513 514 for (i = 0; i < mountroot_config_threads; i++) { 515 if (mountroot_config_lwpids[i] == 0) 516 continue; 517 518 error = kthread_join(mountroot_config_lwpids[i]); 519 if (error) 520 printf("%s: thread %x joined with error %d\n", 521 __func__, i, error); 522 } 523 kmem_free(mountroot_config_lwpids, mountroot_config_lwpids_size); 524 } 525 526 /* 527 * Announce device attach/detach to userland listeners. 528 */ 529 530 int 531 no_devmon_insert(const char *name, prop_dictionary_t p) 532 { 533 534 return ENODEV; 535 } 536 537 static void 538 devmon_report_device(device_t dev, bool isattach) 539 { 540 prop_dictionary_t ev; 541 const char *parent; 542 const char *what; 543 device_t pdev = device_parent(dev); 544 545 /* If currently no drvctl device, just return */ 546 if (devmon_insert_vec == no_devmon_insert) 547 return; 548 549 ev = prop_dictionary_create(); 550 if (ev == NULL) 551 return; 552 553 what = (isattach ? "device-attach" : "device-detach"); 554 parent = (pdev == NULL ? "root" : device_xname(pdev)); 555 if (!prop_dictionary_set_cstring(ev, "device", device_xname(dev)) || 556 !prop_dictionary_set_cstring(ev, "parent", parent)) { 557 prop_object_release(ev); 558 return; 559 } 560 561 if ((*devmon_insert_vec)(what, ev) != 0) 562 prop_object_release(ev); 563 } 564 565 /* 566 * Add a cfdriver to the system. 567 */ 568 int 569 config_cfdriver_attach(struct cfdriver *cd) 570 { 571 struct cfdriver *lcd; 572 573 /* Make sure this driver isn't already in the system. */ 574 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 575 if (STREQ(lcd->cd_name, cd->cd_name)) 576 return EEXIST; 577 } 578 579 LIST_INIT(&cd->cd_attach); 580 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 581 582 return 0; 583 } 584 585 /* 586 * Remove a cfdriver from the system. 587 */ 588 int 589 config_cfdriver_detach(struct cfdriver *cd) 590 { 591 struct alldevs_foray af; 592 int i, rc = 0; 593 594 config_alldevs_enter(&af); 595 /* Make sure there are no active instances. */ 596 for (i = 0; i < cd->cd_ndevs; i++) { 597 if (cd->cd_devs[i] != NULL) { 598 rc = EBUSY; 599 break; 600 } 601 } 602 config_alldevs_exit(&af); 603 604 if (rc != 0) 605 return rc; 606 607 /* ...and no attachments loaded. */ 608 if (LIST_EMPTY(&cd->cd_attach) == 0) 609 return EBUSY; 610 611 LIST_REMOVE(cd, cd_list); 612 613 KASSERT(cd->cd_devs == NULL); 614 615 return 0; 616 } 617 618 /* 619 * Look up a cfdriver by name. 620 */ 621 struct cfdriver * 622 config_cfdriver_lookup(const char *name) 623 { 624 struct cfdriver *cd; 625 626 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 627 if (STREQ(cd->cd_name, name)) 628 return cd; 629 } 630 631 return NULL; 632 } 633 634 /* 635 * Add a cfattach to the specified driver. 636 */ 637 int 638 config_cfattach_attach(const char *driver, struct cfattach *ca) 639 { 640 struct cfattach *lca; 641 struct cfdriver *cd; 642 643 cd = config_cfdriver_lookup(driver); 644 if (cd == NULL) 645 return ESRCH; 646 647 /* Make sure this attachment isn't already on this driver. */ 648 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 649 if (STREQ(lca->ca_name, ca->ca_name)) 650 return EEXIST; 651 } 652 653 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 654 655 return 0; 656 } 657 658 /* 659 * Remove a cfattach from the specified driver. 660 */ 661 int 662 config_cfattach_detach(const char *driver, struct cfattach *ca) 663 { 664 struct alldevs_foray af; 665 struct cfdriver *cd; 666 device_t dev; 667 int i, rc = 0; 668 669 cd = config_cfdriver_lookup(driver); 670 if (cd == NULL) 671 return ESRCH; 672 673 config_alldevs_enter(&af); 674 /* Make sure there are no active instances. */ 675 for (i = 0; i < cd->cd_ndevs; i++) { 676 if ((dev = cd->cd_devs[i]) == NULL) 677 continue; 678 if (dev->dv_cfattach == ca) { 679 rc = EBUSY; 680 break; 681 } 682 } 683 config_alldevs_exit(&af); 684 685 if (rc != 0) 686 return rc; 687 688 LIST_REMOVE(ca, ca_list); 689 690 return 0; 691 } 692 693 /* 694 * Look up a cfattach by name. 695 */ 696 static struct cfattach * 697 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 698 { 699 struct cfattach *ca; 700 701 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 702 if (STREQ(ca->ca_name, atname)) 703 return ca; 704 } 705 706 return NULL; 707 } 708 709 /* 710 * Look up a cfattach by driver/attachment name. 711 */ 712 struct cfattach * 713 config_cfattach_lookup(const char *name, const char *atname) 714 { 715 struct cfdriver *cd; 716 717 cd = config_cfdriver_lookup(name); 718 if (cd == NULL) 719 return NULL; 720 721 return config_cfattach_lookup_cd(cd, atname); 722 } 723 724 /* 725 * Apply the matching function and choose the best. This is used 726 * a few times and we want to keep the code small. 727 */ 728 static void 729 mapply(struct matchinfo *m, cfdata_t cf) 730 { 731 int pri; 732 733 if (m->fn != NULL) { 734 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 735 } else { 736 pri = config_match(m->parent, cf, m->aux); 737 } 738 if (pri > m->pri) { 739 m->match = cf; 740 m->pri = pri; 741 } 742 } 743 744 int 745 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 746 { 747 const struct cfiattrdata *ci; 748 const struct cflocdesc *cl; 749 int nlocs, i; 750 751 ci = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 752 KASSERT(ci); 753 nlocs = ci->ci_loclen; 754 KASSERT(!nlocs || locs); 755 for (i = 0; i < nlocs; i++) { 756 cl = &ci->ci_locdesc[i]; 757 if (cl->cld_defaultstr != NULL && 758 cf->cf_loc[i] == cl->cld_default) 759 continue; 760 if (cf->cf_loc[i] == locs[i]) 761 continue; 762 return 0; 763 } 764 765 return config_match(parent, cf, aux); 766 } 767 768 /* 769 * Helper function: check whether the driver supports the interface attribute 770 * and return its descriptor structure. 771 */ 772 static const struct cfiattrdata * 773 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 774 { 775 const struct cfiattrdata * const *cpp; 776 777 if (cd->cd_attrs == NULL) 778 return 0; 779 780 for (cpp = cd->cd_attrs; *cpp; cpp++) { 781 if (STREQ((*cpp)->ci_name, ia)) { 782 /* Match. */ 783 return *cpp; 784 } 785 } 786 return 0; 787 } 788 789 /* 790 * Lookup an interface attribute description by name. 791 * If the driver is given, consider only its supported attributes. 792 */ 793 const struct cfiattrdata * 794 cfiattr_lookup(const char *name, const struct cfdriver *cd) 795 { 796 const struct cfdriver *d; 797 const struct cfiattrdata *ia; 798 799 if (cd) 800 return cfdriver_get_iattr(cd, name); 801 802 LIST_FOREACH(d, &allcfdrivers, cd_list) { 803 ia = cfdriver_get_iattr(d, name); 804 if (ia) 805 return ia; 806 } 807 return 0; 808 } 809 810 /* 811 * Determine if `parent' is a potential parent for a device spec based 812 * on `cfp'. 813 */ 814 static int 815 cfparent_match(const device_t parent, const struct cfparent *cfp) 816 { 817 struct cfdriver *pcd; 818 819 /* We don't match root nodes here. */ 820 if (cfp == NULL) 821 return 0; 822 823 pcd = parent->dv_cfdriver; 824 KASSERT(pcd != NULL); 825 826 /* 827 * First, ensure this parent has the correct interface 828 * attribute. 829 */ 830 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 831 return 0; 832 833 /* 834 * If no specific parent device instance was specified (i.e. 835 * we're attaching to the attribute only), we're done! 836 */ 837 if (cfp->cfp_parent == NULL) 838 return 1; 839 840 /* 841 * Check the parent device's name. 842 */ 843 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 844 return 0; /* not the same parent */ 845 846 /* 847 * Make sure the unit number matches. 848 */ 849 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 850 cfp->cfp_unit == parent->dv_unit) 851 return 1; 852 853 /* Unit numbers don't match. */ 854 return 0; 855 } 856 857 /* 858 * Helper for config_cfdata_attach(): check all devices whether it could be 859 * parent any attachment in the config data table passed, and rescan. 860 */ 861 static void 862 rescan_with_cfdata(const struct cfdata *cf) 863 { 864 device_t d; 865 const struct cfdata *cf1; 866 deviter_t di; 867 868 869 /* 870 * "alldevs" is likely longer than a modules's cfdata, so make it 871 * the outer loop. 872 */ 873 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 874 875 if (!(d->dv_cfattach->ca_rescan)) 876 continue; 877 878 for (cf1 = cf; cf1->cf_name; cf1++) { 879 880 if (!cfparent_match(d, cf1->cf_pspec)) 881 continue; 882 883 (*d->dv_cfattach->ca_rescan)(d, 884 cfdata_ifattr(cf1), cf1->cf_loc); 885 886 config_deferred(d); 887 } 888 } 889 deviter_release(&di); 890 } 891 892 /* 893 * Attach a supplemental config data table and rescan potential 894 * parent devices if required. 895 */ 896 int 897 config_cfdata_attach(cfdata_t cf, int scannow) 898 { 899 struct cftable *ct; 900 901 ct = kmem_alloc(sizeof(*ct), KM_SLEEP); 902 ct->ct_cfdata = cf; 903 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 904 905 if (scannow) 906 rescan_with_cfdata(cf); 907 908 return 0; 909 } 910 911 /* 912 * Helper for config_cfdata_detach: check whether a device is 913 * found through any attachment in the config data table. 914 */ 915 static int 916 dev_in_cfdata(device_t d, cfdata_t cf) 917 { 918 const struct cfdata *cf1; 919 920 for (cf1 = cf; cf1->cf_name; cf1++) 921 if (d->dv_cfdata == cf1) 922 return 1; 923 924 return 0; 925 } 926 927 /* 928 * Detach a supplemental config data table. Detach all devices found 929 * through that table (and thus keeping references to it) before. 930 */ 931 int 932 config_cfdata_detach(cfdata_t cf) 933 { 934 device_t d; 935 int error = 0; 936 struct cftable *ct; 937 deviter_t di; 938 939 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 940 d = deviter_next(&di)) { 941 if (!dev_in_cfdata(d, cf)) 942 continue; 943 if ((error = config_detach(d, 0)) != 0) 944 break; 945 } 946 deviter_release(&di); 947 if (error) { 948 aprint_error_dev(d, "unable to detach instance\n"); 949 return error; 950 } 951 952 TAILQ_FOREACH(ct, &allcftables, ct_list) { 953 if (ct->ct_cfdata == cf) { 954 TAILQ_REMOVE(&allcftables, ct, ct_list); 955 kmem_free(ct, sizeof(*ct)); 956 return 0; 957 } 958 } 959 960 /* not found -- shouldn't happen */ 961 return EINVAL; 962 } 963 964 /* 965 * Invoke the "match" routine for a cfdata entry on behalf of 966 * an external caller, usually a "submatch" routine. 967 */ 968 int 969 config_match(device_t parent, cfdata_t cf, void *aux) 970 { 971 struct cfattach *ca; 972 973 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 974 if (ca == NULL) { 975 /* No attachment for this entry, oh well. */ 976 return 0; 977 } 978 979 return (*ca->ca_match)(parent, cf, aux); 980 } 981 982 /* 983 * Iterate over all potential children of some device, calling the given 984 * function (default being the child's match function) for each one. 985 * Nonzero returns are matches; the highest value returned is considered 986 * the best match. Return the `found child' if we got a match, or NULL 987 * otherwise. The `aux' pointer is simply passed on through. 988 * 989 * Note that this function is designed so that it can be used to apply 990 * an arbitrary function to all potential children (its return value 991 * can be ignored). 992 */ 993 cfdata_t 994 config_search_loc(cfsubmatch_t fn, device_t parent, 995 const char *ifattr, const int *locs, void *aux) 996 { 997 struct cftable *ct; 998 cfdata_t cf; 999 struct matchinfo m; 1000 1001 KASSERT(config_initialized); 1002 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 1003 1004 m.fn = fn; 1005 m.parent = parent; 1006 m.locs = locs; 1007 m.aux = aux; 1008 m.match = NULL; 1009 m.pri = 0; 1010 1011 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1012 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1013 1014 /* We don't match root nodes here. */ 1015 if (!cf->cf_pspec) 1016 continue; 1017 1018 /* 1019 * Skip cf if no longer eligible, otherwise scan 1020 * through parents for one matching `parent', and 1021 * try match function. 1022 */ 1023 if (cf->cf_fstate == FSTATE_FOUND) 1024 continue; 1025 if (cf->cf_fstate == FSTATE_DNOTFOUND || 1026 cf->cf_fstate == FSTATE_DSTAR) 1027 continue; 1028 1029 /* 1030 * If an interface attribute was specified, 1031 * consider only children which attach to 1032 * that attribute. 1033 */ 1034 if (ifattr && !STREQ(ifattr, cfdata_ifattr(cf))) 1035 continue; 1036 1037 if (cfparent_match(parent, cf->cf_pspec)) 1038 mapply(&m, cf); 1039 } 1040 } 1041 return m.match; 1042 } 1043 1044 cfdata_t 1045 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 1046 void *aux) 1047 { 1048 1049 return config_search_loc(fn, parent, ifattr, NULL, aux); 1050 } 1051 1052 /* 1053 * Find the given root device. 1054 * This is much like config_search, but there is no parent. 1055 * Don't bother with multiple cfdata tables; the root node 1056 * must always be in the initial table. 1057 */ 1058 cfdata_t 1059 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 1060 { 1061 cfdata_t cf; 1062 const short *p; 1063 struct matchinfo m; 1064 1065 m.fn = fn; 1066 m.parent = ROOT; 1067 m.aux = aux; 1068 m.match = NULL; 1069 m.pri = 0; 1070 m.locs = 0; 1071 /* 1072 * Look at root entries for matching name. We do not bother 1073 * with found-state here since only one root should ever be 1074 * searched (and it must be done first). 1075 */ 1076 for (p = cfroots; *p >= 0; p++) { 1077 cf = &cfdata[*p]; 1078 if (strcmp(cf->cf_name, rootname) == 0) 1079 mapply(&m, cf); 1080 } 1081 return m.match; 1082 } 1083 1084 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 1085 1086 /* 1087 * The given `aux' argument describes a device that has been found 1088 * on the given parent, but not necessarily configured. Locate the 1089 * configuration data for that device (using the submatch function 1090 * provided, or using candidates' cd_match configuration driver 1091 * functions) and attach it, and return its device_t. If the device was 1092 * not configured, call the given `print' function and return NULL. 1093 */ 1094 device_t 1095 config_found_sm_loc(device_t parent, 1096 const char *ifattr, const int *locs, void *aux, 1097 cfprint_t print, cfsubmatch_t submatch) 1098 { 1099 cfdata_t cf; 1100 1101 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 1102 return(config_attach_loc(parent, cf, locs, aux, print)); 1103 if (print) { 1104 if (config_do_twiddle && cold) 1105 twiddle(); 1106 aprint_normal("%s", msgs[(*print)(aux, device_xname(parent))]); 1107 } 1108 1109 /* 1110 * This has the effect of mixing in a single timestamp to the 1111 * entropy pool. Experiments indicate the estimator will almost 1112 * always attribute one bit of entropy to this sample; analysis 1113 * of device attach/detach timestamps on FreeBSD indicates 4 1114 * bits of entropy/sample so this seems appropriately conservative. 1115 */ 1116 rnd_add_uint32(&rnd_autoconf_source, 0); 1117 return NULL; 1118 } 1119 1120 device_t 1121 config_found_ia(device_t parent, const char *ifattr, void *aux, 1122 cfprint_t print) 1123 { 1124 1125 return config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL); 1126 } 1127 1128 device_t 1129 config_found(device_t parent, void *aux, cfprint_t print) 1130 { 1131 1132 return config_found_sm_loc(parent, NULL, NULL, aux, print, NULL); 1133 } 1134 1135 /* 1136 * As above, but for root devices. 1137 */ 1138 device_t 1139 config_rootfound(const char *rootname, void *aux) 1140 { 1141 cfdata_t cf; 1142 1143 if ((cf = config_rootsearch(NULL, rootname, aux)) != NULL) 1144 return config_attach(ROOT, cf, aux, NULL); 1145 aprint_error("root device %s not configured\n", rootname); 1146 return NULL; 1147 } 1148 1149 /* just like sprintf(buf, "%d") except that it works from the end */ 1150 static char * 1151 number(char *ep, int n) 1152 { 1153 1154 *--ep = 0; 1155 while (n >= 10) { 1156 *--ep = (n % 10) + '0'; 1157 n /= 10; 1158 } 1159 *--ep = n + '0'; 1160 return ep; 1161 } 1162 1163 /* 1164 * Expand the size of the cd_devs array if necessary. 1165 * 1166 * The caller must hold alldevs.lock. config_makeroom() may release and 1167 * re-acquire alldevs.lock, so callers should re-check conditions such 1168 * as alldevs.nwrite == 0 and alldevs.nread == 0 when config_makeroom() 1169 * returns. 1170 */ 1171 static void 1172 config_makeroom(int n, struct cfdriver *cd) 1173 { 1174 int ondevs, nndevs; 1175 device_t *osp, *nsp; 1176 1177 KASSERT(mutex_owned(&alldevs.lock)); 1178 alldevs.nwrite++; 1179 1180 for (nndevs = MAX(4, cd->cd_ndevs); nndevs <= n; nndevs += nndevs) 1181 ; 1182 1183 while (n >= cd->cd_ndevs) { 1184 /* 1185 * Need to expand the array. 1186 */ 1187 ondevs = cd->cd_ndevs; 1188 osp = cd->cd_devs; 1189 1190 /* 1191 * Release alldevs.lock around allocation, which may 1192 * sleep. 1193 */ 1194 mutex_exit(&alldevs.lock); 1195 nsp = kmem_alloc(sizeof(device_t[nndevs]), KM_SLEEP); 1196 mutex_enter(&alldevs.lock); 1197 1198 /* 1199 * If another thread moved the array while we did 1200 * not hold alldevs.lock, try again. 1201 */ 1202 if (cd->cd_devs != osp) { 1203 mutex_exit(&alldevs.lock); 1204 kmem_free(nsp, sizeof(device_t[nndevs])); 1205 mutex_enter(&alldevs.lock); 1206 continue; 1207 } 1208 1209 memset(nsp + ondevs, 0, sizeof(device_t[nndevs - ondevs])); 1210 if (ondevs != 0) 1211 memcpy(nsp, cd->cd_devs, sizeof(device_t[ondevs])); 1212 1213 cd->cd_ndevs = nndevs; 1214 cd->cd_devs = nsp; 1215 if (ondevs != 0) { 1216 mutex_exit(&alldevs.lock); 1217 kmem_free(osp, sizeof(device_t[ondevs])); 1218 mutex_enter(&alldevs.lock); 1219 } 1220 } 1221 KASSERT(mutex_owned(&alldevs.lock)); 1222 alldevs.nwrite--; 1223 } 1224 1225 /* 1226 * Put dev into the devices list. 1227 */ 1228 static void 1229 config_devlink(device_t dev) 1230 { 1231 1232 mutex_enter(&alldevs.lock); 1233 1234 KASSERT(device_cfdriver(dev)->cd_devs[dev->dv_unit] == dev); 1235 1236 dev->dv_add_gen = alldevs.gen; 1237 /* It is safe to add a device to the tail of the list while 1238 * readers and writers are in the list. 1239 */ 1240 TAILQ_INSERT_TAIL(&alldevs.list, dev, dv_list); 1241 mutex_exit(&alldevs.lock); 1242 } 1243 1244 static void 1245 config_devfree(device_t dev) 1246 { 1247 int priv = (dev->dv_flags & DVF_PRIV_ALLOC); 1248 1249 if (dev->dv_cfattach->ca_devsize > 0) 1250 kmem_free(dev->dv_private, dev->dv_cfattach->ca_devsize); 1251 if (priv) 1252 kmem_free(dev, sizeof(*dev)); 1253 } 1254 1255 /* 1256 * Caller must hold alldevs.lock. 1257 */ 1258 static void 1259 config_devunlink(device_t dev, struct devicelist *garbage) 1260 { 1261 struct device_garbage *dg = &dev->dv_garbage; 1262 cfdriver_t cd = device_cfdriver(dev); 1263 int i; 1264 1265 KASSERT(mutex_owned(&alldevs.lock)); 1266 1267 /* Unlink from device list. Link to garbage list. */ 1268 TAILQ_REMOVE(&alldevs.list, dev, dv_list); 1269 TAILQ_INSERT_TAIL(garbage, dev, dv_list); 1270 1271 /* Remove from cfdriver's array. */ 1272 cd->cd_devs[dev->dv_unit] = NULL; 1273 1274 /* 1275 * If the device now has no units in use, unlink its softc array. 1276 */ 1277 for (i = 0; i < cd->cd_ndevs; i++) { 1278 if (cd->cd_devs[i] != NULL) 1279 break; 1280 } 1281 /* Nothing found. Unlink, now. Deallocate, later. */ 1282 if (i == cd->cd_ndevs) { 1283 dg->dg_ndevs = cd->cd_ndevs; 1284 dg->dg_devs = cd->cd_devs; 1285 cd->cd_devs = NULL; 1286 cd->cd_ndevs = 0; 1287 } 1288 } 1289 1290 static void 1291 config_devdelete(device_t dev) 1292 { 1293 struct device_garbage *dg = &dev->dv_garbage; 1294 device_lock_t dvl = device_getlock(dev); 1295 1296 if (dg->dg_devs != NULL) 1297 kmem_free(dg->dg_devs, sizeof(device_t[dg->dg_ndevs])); 1298 1299 cv_destroy(&dvl->dvl_cv); 1300 mutex_destroy(&dvl->dvl_mtx); 1301 1302 KASSERT(dev->dv_properties != NULL); 1303 prop_object_release(dev->dv_properties); 1304 1305 if (dev->dv_activity_handlers) 1306 panic("%s with registered handlers", __func__); 1307 1308 if (dev->dv_locators) { 1309 size_t amount = *--dev->dv_locators; 1310 kmem_free(dev->dv_locators, amount); 1311 } 1312 1313 config_devfree(dev); 1314 } 1315 1316 static int 1317 config_unit_nextfree(cfdriver_t cd, cfdata_t cf) 1318 { 1319 int unit; 1320 1321 if (cf->cf_fstate == FSTATE_STAR) { 1322 for (unit = cf->cf_unit; unit < cd->cd_ndevs; unit++) 1323 if (cd->cd_devs[unit] == NULL) 1324 break; 1325 /* 1326 * unit is now the unit of the first NULL device pointer, 1327 * or max(cd->cd_ndevs,cf->cf_unit). 1328 */ 1329 } else { 1330 unit = cf->cf_unit; 1331 if (unit < cd->cd_ndevs && cd->cd_devs[unit] != NULL) 1332 unit = -1; 1333 } 1334 return unit; 1335 } 1336 1337 static int 1338 config_unit_alloc(device_t dev, cfdriver_t cd, cfdata_t cf) 1339 { 1340 struct alldevs_foray af; 1341 int unit; 1342 1343 config_alldevs_enter(&af); 1344 for (;;) { 1345 unit = config_unit_nextfree(cd, cf); 1346 if (unit == -1) 1347 break; 1348 if (unit < cd->cd_ndevs) { 1349 cd->cd_devs[unit] = dev; 1350 dev->dv_unit = unit; 1351 break; 1352 } 1353 config_makeroom(unit, cd); 1354 } 1355 config_alldevs_exit(&af); 1356 1357 return unit; 1358 } 1359 1360 static device_t 1361 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1362 { 1363 cfdriver_t cd; 1364 cfattach_t ca; 1365 size_t lname, lunit; 1366 const char *xunit; 1367 int myunit; 1368 char num[10]; 1369 device_t dev; 1370 void *dev_private; 1371 const struct cfiattrdata *ia; 1372 device_lock_t dvl; 1373 1374 cd = config_cfdriver_lookup(cf->cf_name); 1375 if (cd == NULL) 1376 return NULL; 1377 1378 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1379 if (ca == NULL) 1380 return NULL; 1381 1382 /* get memory for all device vars */ 1383 KASSERTMSG((ca->ca_flags & DVF_PRIV_ALLOC) 1384 || ca->ca_devsize >= sizeof(struct device), 1385 "%s: %s (%zu < %zu)", __func__, cf->cf_atname, ca->ca_devsize, 1386 sizeof(struct device)); 1387 if (ca->ca_devsize > 0) { 1388 dev_private = kmem_zalloc(ca->ca_devsize, KM_SLEEP); 1389 } else { 1390 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1391 dev_private = NULL; 1392 } 1393 1394 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1395 dev = kmem_zalloc(sizeof(*dev), KM_SLEEP); 1396 } else { 1397 dev = dev_private; 1398 #ifdef DIAGNOSTIC 1399 printf("%s has not been converted to device_t\n", cd->cd_name); 1400 #endif 1401 } 1402 dev->dv_class = cd->cd_class; 1403 dev->dv_cfdata = cf; 1404 dev->dv_cfdriver = cd; 1405 dev->dv_cfattach = ca; 1406 dev->dv_activity_count = 0; 1407 dev->dv_activity_handlers = NULL; 1408 dev->dv_private = dev_private; 1409 dev->dv_flags = ca->ca_flags; /* inherit flags from class */ 1410 1411 myunit = config_unit_alloc(dev, cd, cf); 1412 if (myunit == -1) { 1413 config_devfree(dev); 1414 return NULL; 1415 } 1416 1417 /* compute length of name and decimal expansion of unit number */ 1418 lname = strlen(cd->cd_name); 1419 xunit = number(&num[sizeof(num)], myunit); 1420 lunit = &num[sizeof(num)] - xunit; 1421 if (lname + lunit > sizeof(dev->dv_xname)) 1422 panic("config_devalloc: device name too long"); 1423 1424 dvl = device_getlock(dev); 1425 1426 mutex_init(&dvl->dvl_mtx, MUTEX_DEFAULT, IPL_NONE); 1427 cv_init(&dvl->dvl_cv, "pmfsusp"); 1428 1429 memcpy(dev->dv_xname, cd->cd_name, lname); 1430 memcpy(dev->dv_xname + lname, xunit, lunit); 1431 dev->dv_parent = parent; 1432 if (parent != NULL) { 1433 dev->dv_depth = parent->dv_depth + 1; 1434 dev->dv_maxphys = parent->dv_maxphys; 1435 } else { 1436 dev->dv_depth = 0; 1437 dev->dv_maxphys = MACHINE_MAXPHYS; 1438 } 1439 aprint_debug_dev(dev, "dv_maxphys = %d", dev->dv_maxphys); 1440 dev->dv_flags |= DVF_ACTIVE; /* always initially active */ 1441 if (locs) { 1442 KASSERT(parent); /* no locators at root */ 1443 ia = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 1444 dev->dv_locators = 1445 kmem_alloc(sizeof(int [ia->ci_loclen + 1]), KM_SLEEP); 1446 *dev->dv_locators++ = sizeof(int [ia->ci_loclen + 1]); 1447 memcpy(dev->dv_locators, locs, sizeof(int [ia->ci_loclen])); 1448 } 1449 dev->dv_properties = prop_dictionary_create(); 1450 KASSERT(dev->dv_properties != NULL); 1451 1452 prop_dictionary_set_cstring_nocopy(dev->dv_properties, 1453 "device-driver", dev->dv_cfdriver->cd_name); 1454 prop_dictionary_set_uint16(dev->dv_properties, 1455 "device-unit", dev->dv_unit); 1456 if (parent != NULL) { 1457 prop_dictionary_set_cstring(dev->dv_properties, 1458 "device-parent", device_xname(parent)); 1459 } 1460 1461 if (dev->dv_cfdriver->cd_attrs != NULL) 1462 config_add_attrib_dict(dev); 1463 1464 return dev; 1465 } 1466 1467 /* 1468 * Create an array of device attach attributes and add it 1469 * to the device's dv_properties dictionary. 1470 * 1471 * <key>interface-attributes</key> 1472 * <array> 1473 * <dict> 1474 * <key>attribute-name</key> 1475 * <string>foo</string> 1476 * <key>locators</key> 1477 * <array> 1478 * <dict> 1479 * <key>loc-name</key> 1480 * <string>foo-loc1</string> 1481 * </dict> 1482 * <dict> 1483 * <key>loc-name</key> 1484 * <string>foo-loc2</string> 1485 * <key>default</key> 1486 * <string>foo-loc2-default</string> 1487 * </dict> 1488 * ... 1489 * </array> 1490 * </dict> 1491 * ... 1492 * </array> 1493 */ 1494 1495 static void 1496 config_add_attrib_dict(device_t dev) 1497 { 1498 int i, j; 1499 const struct cfiattrdata *ci; 1500 prop_dictionary_t attr_dict, loc_dict; 1501 prop_array_t attr_array, loc_array; 1502 1503 if ((attr_array = prop_array_create()) == NULL) 1504 return; 1505 1506 for (i = 0; ; i++) { 1507 if ((ci = dev->dv_cfdriver->cd_attrs[i]) == NULL) 1508 break; 1509 if ((attr_dict = prop_dictionary_create()) == NULL) 1510 break; 1511 prop_dictionary_set_cstring_nocopy(attr_dict, "attribute-name", 1512 ci->ci_name); 1513 1514 /* Create an array of the locator names and defaults */ 1515 1516 if (ci->ci_loclen != 0 && 1517 (loc_array = prop_array_create()) != NULL) { 1518 for (j = 0; j < ci->ci_loclen; j++) { 1519 loc_dict = prop_dictionary_create(); 1520 if (loc_dict == NULL) 1521 continue; 1522 prop_dictionary_set_cstring_nocopy(loc_dict, 1523 "loc-name", ci->ci_locdesc[j].cld_name); 1524 if (ci->ci_locdesc[j].cld_defaultstr != NULL) 1525 prop_dictionary_set_cstring_nocopy( 1526 loc_dict, "default", 1527 ci->ci_locdesc[j].cld_defaultstr); 1528 prop_array_set(loc_array, j, loc_dict); 1529 prop_object_release(loc_dict); 1530 } 1531 prop_dictionary_set_and_rel(attr_dict, "locators", 1532 loc_array); 1533 } 1534 prop_array_add(attr_array, attr_dict); 1535 prop_object_release(attr_dict); 1536 } 1537 if (i == 0) 1538 prop_object_release(attr_array); 1539 else 1540 prop_dictionary_set_and_rel(dev->dv_properties, 1541 "interface-attributes", attr_array); 1542 1543 return; 1544 } 1545 1546 /* 1547 * Attach a found device. 1548 */ 1549 device_t 1550 config_attach_loc(device_t parent, cfdata_t cf, 1551 const int *locs, void *aux, cfprint_t print) 1552 { 1553 device_t dev; 1554 struct cftable *ct; 1555 const char *drvname; 1556 1557 dev = config_devalloc(parent, cf, locs); 1558 if (!dev) 1559 panic("config_attach: allocation of device softc failed"); 1560 1561 /* XXX redundant - see below? */ 1562 if (cf->cf_fstate != FSTATE_STAR) { 1563 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1564 cf->cf_fstate = FSTATE_FOUND; 1565 } 1566 1567 config_devlink(dev); 1568 1569 if (config_do_twiddle && cold) 1570 twiddle(); 1571 else 1572 aprint_naive("Found "); 1573 /* 1574 * We want the next two printfs for normal, verbose, and quiet, 1575 * but not silent (in which case, we're twiddling, instead). 1576 */ 1577 if (parent == ROOT) { 1578 aprint_naive("%s (root)", device_xname(dev)); 1579 aprint_normal("%s (root)", device_xname(dev)); 1580 } else { 1581 aprint_naive("%s at %s", device_xname(dev), 1582 device_xname(parent)); 1583 aprint_normal("%s at %s", device_xname(dev), 1584 device_xname(parent)); 1585 if (print) 1586 (void) (*print)(aux, NULL); 1587 } 1588 1589 /* 1590 * Before attaching, clobber any unfound devices that are 1591 * otherwise identical. 1592 * XXX code above is redundant? 1593 */ 1594 drvname = dev->dv_cfdriver->cd_name; 1595 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1596 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1597 if (STREQ(cf->cf_name, drvname) && 1598 cf->cf_unit == dev->dv_unit) { 1599 if (cf->cf_fstate == FSTATE_NOTFOUND) 1600 cf->cf_fstate = FSTATE_FOUND; 1601 } 1602 } 1603 } 1604 device_register(dev, aux); 1605 1606 /* Let userland know */ 1607 devmon_report_device(dev, true); 1608 1609 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1610 1611 if (!device_pmf_is_registered(dev)) 1612 aprint_debug_dev(dev, "WARNING: power management not " 1613 "supported\n"); 1614 1615 config_process_deferred(&deferred_config_queue, dev); 1616 1617 device_register_post_config(dev, aux); 1618 return dev; 1619 } 1620 1621 device_t 1622 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1623 { 1624 1625 return config_attach_loc(parent, cf, NULL, aux, print); 1626 } 1627 1628 /* 1629 * As above, but for pseudo-devices. Pseudo-devices attached in this 1630 * way are silently inserted into the device tree, and their children 1631 * attached. 1632 * 1633 * Note that because pseudo-devices are attached silently, any information 1634 * the attach routine wishes to print should be prefixed with the device 1635 * name by the attach routine. 1636 */ 1637 device_t 1638 config_attach_pseudo(cfdata_t cf) 1639 { 1640 device_t dev; 1641 1642 dev = config_devalloc(ROOT, cf, NULL); 1643 if (!dev) 1644 return NULL; 1645 1646 /* XXX mark busy in cfdata */ 1647 1648 if (cf->cf_fstate != FSTATE_STAR) { 1649 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1650 cf->cf_fstate = FSTATE_FOUND; 1651 } 1652 1653 config_devlink(dev); 1654 1655 #if 0 /* XXXJRT not yet */ 1656 device_register(dev, NULL); /* like a root node */ 1657 #endif 1658 1659 /* Let userland know */ 1660 devmon_report_device(dev, true); 1661 1662 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1663 1664 config_process_deferred(&deferred_config_queue, dev); 1665 return dev; 1666 } 1667 1668 /* 1669 * Caller must hold alldevs.lock. 1670 */ 1671 static void 1672 config_collect_garbage(struct devicelist *garbage) 1673 { 1674 device_t dv; 1675 1676 KASSERT(!cpu_intr_p()); 1677 KASSERT(!cpu_softintr_p()); 1678 KASSERT(mutex_owned(&alldevs.lock)); 1679 1680 while (alldevs.nwrite == 0 && alldevs.nread == 0 && alldevs.garbage) { 1681 TAILQ_FOREACH(dv, &alldevs.list, dv_list) { 1682 if (dv->dv_del_gen != 0) 1683 break; 1684 } 1685 if (dv == NULL) { 1686 alldevs.garbage = false; 1687 break; 1688 } 1689 config_devunlink(dv, garbage); 1690 } 1691 KASSERT(mutex_owned(&alldevs.lock)); 1692 } 1693 1694 static void 1695 config_dump_garbage(struct devicelist *garbage) 1696 { 1697 device_t dv; 1698 1699 while ((dv = TAILQ_FIRST(garbage)) != NULL) { 1700 TAILQ_REMOVE(garbage, dv, dv_list); 1701 config_devdelete(dv); 1702 } 1703 } 1704 1705 /* 1706 * Detach a device. Optionally forced (e.g. because of hardware 1707 * removal) and quiet. Returns zero if successful, non-zero 1708 * (an error code) otherwise. 1709 * 1710 * Note that this code wants to be run from a process context, so 1711 * that the detach can sleep to allow processes which have a device 1712 * open to run and unwind their stacks. 1713 */ 1714 int 1715 config_detach(device_t dev, int flags) 1716 { 1717 struct alldevs_foray af; 1718 struct cftable *ct; 1719 cfdata_t cf; 1720 const struct cfattach *ca; 1721 struct cfdriver *cd; 1722 device_t d __diagused; 1723 int rv = 0; 1724 1725 cf = dev->dv_cfdata; 1726 KASSERTMSG((cf == NULL || cf->cf_fstate == FSTATE_FOUND || 1727 cf->cf_fstate == FSTATE_STAR), 1728 "config_detach: %s: bad device fstate: %d", 1729 device_xname(dev), cf ? cf->cf_fstate : -1); 1730 1731 cd = dev->dv_cfdriver; 1732 KASSERT(cd != NULL); 1733 1734 ca = dev->dv_cfattach; 1735 KASSERT(ca != NULL); 1736 1737 mutex_enter(&alldevs.lock); 1738 if (dev->dv_del_gen != 0) { 1739 mutex_exit(&alldevs.lock); 1740 #ifdef DIAGNOSTIC 1741 printf("%s: %s is already detached\n", __func__, 1742 device_xname(dev)); 1743 #endif /* DIAGNOSTIC */ 1744 return ENOENT; 1745 } 1746 alldevs.nwrite++; 1747 mutex_exit(&alldevs.lock); 1748 1749 if (!detachall && 1750 (flags & (DETACH_SHUTDOWN|DETACH_FORCE)) == DETACH_SHUTDOWN && 1751 (dev->dv_flags & DVF_DETACH_SHUTDOWN) == 0) { 1752 rv = EOPNOTSUPP; 1753 } else if (ca->ca_detach != NULL) { 1754 rv = (*ca->ca_detach)(dev, flags); 1755 } else 1756 rv = EOPNOTSUPP; 1757 1758 /* 1759 * If it was not possible to detach the device, then we either 1760 * panic() (for the forced but failed case), or return an error. 1761 * 1762 * If it was possible to detach the device, ensure that the 1763 * device is deactivated. 1764 */ 1765 if (rv == 0) 1766 dev->dv_flags &= ~DVF_ACTIVE; 1767 else if ((flags & DETACH_FORCE) == 0) 1768 goto out; 1769 else { 1770 panic("config_detach: forced detach of %s failed (%d)", 1771 device_xname(dev), rv); 1772 } 1773 1774 /* 1775 * The device has now been successfully detached. 1776 */ 1777 1778 /* Let userland know */ 1779 devmon_report_device(dev, false); 1780 1781 #ifdef DIAGNOSTIC 1782 /* 1783 * Sanity: If you're successfully detached, you should have no 1784 * children. (Note that because children must be attached 1785 * after parents, we only need to search the latter part of 1786 * the list.) 1787 */ 1788 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1789 d = TAILQ_NEXT(d, dv_list)) { 1790 if (d->dv_parent == dev && d->dv_del_gen == 0) { 1791 printf("config_detach: detached device %s" 1792 " has children %s\n", device_xname(dev), 1793 device_xname(d)); 1794 panic("config_detach"); 1795 } 1796 } 1797 #endif 1798 1799 /* notify the parent that the child is gone */ 1800 if (dev->dv_parent) { 1801 device_t p = dev->dv_parent; 1802 if (p->dv_cfattach->ca_childdetached) 1803 (*p->dv_cfattach->ca_childdetached)(p, dev); 1804 } 1805 1806 /* 1807 * Mark cfdata to show that the unit can be reused, if possible. 1808 */ 1809 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1810 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1811 if (STREQ(cf->cf_name, cd->cd_name)) { 1812 if (cf->cf_fstate == FSTATE_FOUND && 1813 cf->cf_unit == dev->dv_unit) 1814 cf->cf_fstate = FSTATE_NOTFOUND; 1815 } 1816 } 1817 } 1818 1819 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1820 aprint_normal_dev(dev, "detached\n"); 1821 1822 out: 1823 config_alldevs_enter(&af); 1824 KASSERT(alldevs.nwrite != 0); 1825 --alldevs.nwrite; 1826 if (rv == 0 && dev->dv_del_gen == 0) { 1827 if (alldevs.nwrite == 0 && alldevs.nread == 0) 1828 config_devunlink(dev, &af.af_garbage); 1829 else { 1830 dev->dv_del_gen = alldevs.gen; 1831 alldevs.garbage = true; 1832 } 1833 } 1834 config_alldevs_exit(&af); 1835 1836 return rv; 1837 } 1838 1839 int 1840 config_detach_children(device_t parent, int flags) 1841 { 1842 device_t dv; 1843 deviter_t di; 1844 int error = 0; 1845 1846 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1847 dv = deviter_next(&di)) { 1848 if (device_parent(dv) != parent) 1849 continue; 1850 if ((error = config_detach(dv, flags)) != 0) 1851 break; 1852 } 1853 deviter_release(&di); 1854 return error; 1855 } 1856 1857 device_t 1858 shutdown_first(struct shutdown_state *s) 1859 { 1860 if (!s->initialized) { 1861 deviter_init(&s->di, DEVITER_F_SHUTDOWN|DEVITER_F_LEAVES_FIRST); 1862 s->initialized = true; 1863 } 1864 return shutdown_next(s); 1865 } 1866 1867 device_t 1868 shutdown_next(struct shutdown_state *s) 1869 { 1870 device_t dv; 1871 1872 while ((dv = deviter_next(&s->di)) != NULL && !device_is_active(dv)) 1873 ; 1874 1875 if (dv == NULL) 1876 s->initialized = false; 1877 1878 return dv; 1879 } 1880 1881 bool 1882 config_detach_all(int how) 1883 { 1884 static struct shutdown_state s; 1885 device_t curdev; 1886 bool progress = false; 1887 int flags; 1888 1889 if ((how & (RB_NOSYNC|RB_DUMP)) != 0) 1890 return false; 1891 1892 if ((how & RB_POWERDOWN) == RB_POWERDOWN) 1893 flags = DETACH_SHUTDOWN | DETACH_POWEROFF; 1894 else 1895 flags = DETACH_SHUTDOWN; 1896 1897 for (curdev = shutdown_first(&s); curdev != NULL; 1898 curdev = shutdown_next(&s)) { 1899 aprint_debug(" detaching %s, ", device_xname(curdev)); 1900 if (config_detach(curdev, flags) == 0) { 1901 progress = true; 1902 aprint_debug("success."); 1903 } else 1904 aprint_debug("failed."); 1905 } 1906 return progress; 1907 } 1908 1909 static bool 1910 device_is_ancestor_of(device_t ancestor, device_t descendant) 1911 { 1912 device_t dv; 1913 1914 for (dv = descendant; dv != NULL; dv = device_parent(dv)) { 1915 if (device_parent(dv) == ancestor) 1916 return true; 1917 } 1918 return false; 1919 } 1920 1921 int 1922 config_deactivate(device_t dev) 1923 { 1924 deviter_t di; 1925 const struct cfattach *ca; 1926 device_t descendant; 1927 int s, rv = 0, oflags; 1928 1929 for (descendant = deviter_first(&di, DEVITER_F_ROOT_FIRST); 1930 descendant != NULL; 1931 descendant = deviter_next(&di)) { 1932 if (dev != descendant && 1933 !device_is_ancestor_of(dev, descendant)) 1934 continue; 1935 1936 if ((descendant->dv_flags & DVF_ACTIVE) == 0) 1937 continue; 1938 1939 ca = descendant->dv_cfattach; 1940 oflags = descendant->dv_flags; 1941 1942 descendant->dv_flags &= ~DVF_ACTIVE; 1943 if (ca->ca_activate == NULL) 1944 continue; 1945 s = splhigh(); 1946 rv = (*ca->ca_activate)(descendant, DVACT_DEACTIVATE); 1947 splx(s); 1948 if (rv != 0) 1949 descendant->dv_flags = oflags; 1950 } 1951 deviter_release(&di); 1952 return rv; 1953 } 1954 1955 /* 1956 * Defer the configuration of the specified device until all 1957 * of its parent's devices have been attached. 1958 */ 1959 void 1960 config_defer(device_t dev, void (*func)(device_t)) 1961 { 1962 struct deferred_config *dc; 1963 1964 if (dev->dv_parent == NULL) 1965 panic("config_defer: can't defer config of a root device"); 1966 1967 #ifdef DIAGNOSTIC 1968 TAILQ_FOREACH(dc, &deferred_config_queue, dc_queue) { 1969 if (dc->dc_dev == dev) 1970 panic("config_defer: deferred twice"); 1971 } 1972 #endif 1973 1974 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1975 dc->dc_dev = dev; 1976 dc->dc_func = func; 1977 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1978 config_pending_incr(dev); 1979 } 1980 1981 /* 1982 * Defer some autoconfiguration for a device until after interrupts 1983 * are enabled. 1984 */ 1985 void 1986 config_interrupts(device_t dev, void (*func)(device_t)) 1987 { 1988 struct deferred_config *dc; 1989 1990 /* 1991 * If interrupts are enabled, callback now. 1992 */ 1993 if (cold == 0) { 1994 (*func)(dev); 1995 return; 1996 } 1997 1998 #ifdef DIAGNOSTIC 1999 TAILQ_FOREACH(dc, &interrupt_config_queue, dc_queue) { 2000 if (dc->dc_dev == dev) 2001 panic("config_interrupts: deferred twice"); 2002 } 2003 #endif 2004 2005 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2006 dc->dc_dev = dev; 2007 dc->dc_func = func; 2008 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 2009 config_pending_incr(dev); 2010 } 2011 2012 /* 2013 * Defer some autoconfiguration for a device until after root file system 2014 * is mounted (to load firmware etc). 2015 */ 2016 void 2017 config_mountroot(device_t dev, void (*func)(device_t)) 2018 { 2019 struct deferred_config *dc; 2020 2021 /* 2022 * If root file system is mounted, callback now. 2023 */ 2024 if (root_is_mounted) { 2025 (*func)(dev); 2026 return; 2027 } 2028 2029 #ifdef DIAGNOSTIC 2030 TAILQ_FOREACH(dc, &mountroot_config_queue, dc_queue) { 2031 if (dc->dc_dev == dev) 2032 panic("%s: deferred twice", __func__); 2033 } 2034 #endif 2035 2036 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2037 dc->dc_dev = dev; 2038 dc->dc_func = func; 2039 TAILQ_INSERT_TAIL(&mountroot_config_queue, dc, dc_queue); 2040 } 2041 2042 /* 2043 * Process a deferred configuration queue. 2044 */ 2045 static void 2046 config_process_deferred(struct deferred_config_head *queue, device_t parent) 2047 { 2048 struct deferred_config *dc, *ndc; 2049 2050 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 2051 ndc = TAILQ_NEXT(dc, dc_queue); 2052 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 2053 TAILQ_REMOVE(queue, dc, dc_queue); 2054 (*dc->dc_func)(dc->dc_dev); 2055 config_pending_decr(dc->dc_dev); 2056 kmem_free(dc, sizeof(*dc)); 2057 } 2058 } 2059 } 2060 2061 /* 2062 * Manipulate the config_pending semaphore. 2063 */ 2064 void 2065 config_pending_incr(device_t dev) 2066 { 2067 2068 mutex_enter(&config_misc_lock); 2069 config_pending++; 2070 #ifdef DEBUG_AUTOCONF 2071 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2072 #endif 2073 mutex_exit(&config_misc_lock); 2074 } 2075 2076 void 2077 config_pending_decr(device_t dev) 2078 { 2079 2080 KASSERT(0 < config_pending); 2081 mutex_enter(&config_misc_lock); 2082 config_pending--; 2083 #ifdef DEBUG_AUTOCONF 2084 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2085 #endif 2086 if (config_pending == 0) 2087 cv_broadcast(&config_misc_cv); 2088 mutex_exit(&config_misc_lock); 2089 } 2090 2091 /* 2092 * Register a "finalization" routine. Finalization routines are 2093 * called iteratively once all real devices have been found during 2094 * autoconfiguration, for as long as any one finalizer has done 2095 * any work. 2096 */ 2097 int 2098 config_finalize_register(device_t dev, int (*fn)(device_t)) 2099 { 2100 struct finalize_hook *f; 2101 2102 /* 2103 * If finalization has already been done, invoke the 2104 * callback function now. 2105 */ 2106 if (config_finalize_done) { 2107 while ((*fn)(dev) != 0) 2108 /* loop */ ; 2109 return 0; 2110 } 2111 2112 /* Ensure this isn't already on the list. */ 2113 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 2114 if (f->f_func == fn && f->f_dev == dev) 2115 return EEXIST; 2116 } 2117 2118 f = kmem_alloc(sizeof(*f), KM_SLEEP); 2119 f->f_func = fn; 2120 f->f_dev = dev; 2121 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 2122 2123 return 0; 2124 } 2125 2126 void 2127 config_finalize(void) 2128 { 2129 struct finalize_hook *f; 2130 struct pdevinit *pdev; 2131 extern struct pdevinit pdevinit[]; 2132 int errcnt, rv; 2133 2134 /* 2135 * Now that device driver threads have been created, wait for 2136 * them to finish any deferred autoconfiguration. 2137 */ 2138 mutex_enter(&config_misc_lock); 2139 while (config_pending != 0) 2140 cv_wait(&config_misc_cv, &config_misc_lock); 2141 mutex_exit(&config_misc_lock); 2142 2143 KERNEL_LOCK(1, NULL); 2144 2145 /* Attach pseudo-devices. */ 2146 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 2147 (*pdev->pdev_attach)(pdev->pdev_count); 2148 2149 /* Run the hooks until none of them does any work. */ 2150 do { 2151 rv = 0; 2152 TAILQ_FOREACH(f, &config_finalize_list, f_list) 2153 rv |= (*f->f_func)(f->f_dev); 2154 } while (rv != 0); 2155 2156 config_finalize_done = 1; 2157 2158 /* Now free all the hooks. */ 2159 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 2160 TAILQ_REMOVE(&config_finalize_list, f, f_list); 2161 kmem_free(f, sizeof(*f)); 2162 } 2163 2164 KERNEL_UNLOCK_ONE(NULL); 2165 2166 errcnt = aprint_get_error_count(); 2167 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 2168 (boothowto & AB_VERBOSE) == 0) { 2169 mutex_enter(&config_misc_lock); 2170 if (config_do_twiddle) { 2171 config_do_twiddle = 0; 2172 printf_nolog(" done.\n"); 2173 } 2174 mutex_exit(&config_misc_lock); 2175 } 2176 if (errcnt != 0) { 2177 printf("WARNING: %d error%s while detecting hardware; " 2178 "check system log.\n", errcnt, 2179 errcnt == 1 ? "" : "s"); 2180 } 2181 } 2182 2183 void 2184 config_twiddle_init(void) 2185 { 2186 2187 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 2188 config_do_twiddle = 1; 2189 } 2190 callout_setfunc(&config_twiddle_ch, config_twiddle_fn, NULL); 2191 } 2192 2193 void 2194 config_twiddle_fn(void *cookie) 2195 { 2196 2197 mutex_enter(&config_misc_lock); 2198 if (config_do_twiddle) { 2199 twiddle(); 2200 callout_schedule(&config_twiddle_ch, mstohz(100)); 2201 } 2202 mutex_exit(&config_misc_lock); 2203 } 2204 2205 static void 2206 config_alldevs_enter(struct alldevs_foray *af) 2207 { 2208 TAILQ_INIT(&af->af_garbage); 2209 mutex_enter(&alldevs.lock); 2210 config_collect_garbage(&af->af_garbage); 2211 } 2212 2213 static void 2214 config_alldevs_exit(struct alldevs_foray *af) 2215 { 2216 mutex_exit(&alldevs.lock); 2217 config_dump_garbage(&af->af_garbage); 2218 } 2219 2220 /* 2221 * device_lookup: 2222 * 2223 * Look up a device instance for a given driver. 2224 */ 2225 device_t 2226 device_lookup(cfdriver_t cd, int unit) 2227 { 2228 device_t dv; 2229 2230 mutex_enter(&alldevs.lock); 2231 if (unit < 0 || unit >= cd->cd_ndevs) 2232 dv = NULL; 2233 else if ((dv = cd->cd_devs[unit]) != NULL && dv->dv_del_gen != 0) 2234 dv = NULL; 2235 mutex_exit(&alldevs.lock); 2236 2237 return dv; 2238 } 2239 2240 /* 2241 * device_lookup_private: 2242 * 2243 * Look up a softc instance for a given driver. 2244 */ 2245 void * 2246 device_lookup_private(cfdriver_t cd, int unit) 2247 { 2248 2249 return device_private(device_lookup(cd, unit)); 2250 } 2251 2252 /* 2253 * device_find_by_xname: 2254 * 2255 * Returns the device of the given name or NULL if it doesn't exist. 2256 */ 2257 device_t 2258 device_find_by_xname(const char *name) 2259 { 2260 device_t dv; 2261 deviter_t di; 2262 2263 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 2264 if (strcmp(device_xname(dv), name) == 0) 2265 break; 2266 } 2267 deviter_release(&di); 2268 2269 return dv; 2270 } 2271 2272 /* 2273 * device_find_by_driver_unit: 2274 * 2275 * Returns the device of the given driver name and unit or 2276 * NULL if it doesn't exist. 2277 */ 2278 device_t 2279 device_find_by_driver_unit(const char *name, int unit) 2280 { 2281 struct cfdriver *cd; 2282 2283 if ((cd = config_cfdriver_lookup(name)) == NULL) 2284 return NULL; 2285 return device_lookup(cd, unit); 2286 } 2287 2288 /* 2289 * Power management related functions. 2290 */ 2291 2292 bool 2293 device_pmf_is_registered(device_t dev) 2294 { 2295 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 2296 } 2297 2298 bool 2299 device_pmf_driver_suspend(device_t dev, const pmf_qual_t *qual) 2300 { 2301 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2302 return true; 2303 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2304 return false; 2305 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2306 dev->dv_driver_suspend != NULL && 2307 !(*dev->dv_driver_suspend)(dev, qual)) 2308 return false; 2309 2310 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 2311 return true; 2312 } 2313 2314 bool 2315 device_pmf_driver_resume(device_t dev, const pmf_qual_t *qual) 2316 { 2317 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2318 return true; 2319 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2320 return false; 2321 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2322 dev->dv_driver_resume != NULL && 2323 !(*dev->dv_driver_resume)(dev, qual)) 2324 return false; 2325 2326 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2327 return true; 2328 } 2329 2330 bool 2331 device_pmf_driver_shutdown(device_t dev, int how) 2332 { 2333 2334 if (*dev->dv_driver_shutdown != NULL && 2335 !(*dev->dv_driver_shutdown)(dev, how)) 2336 return false; 2337 return true; 2338 } 2339 2340 bool 2341 device_pmf_driver_register(device_t dev, 2342 bool (*suspend)(device_t, const pmf_qual_t *), 2343 bool (*resume)(device_t, const pmf_qual_t *), 2344 bool (*shutdown)(device_t, int)) 2345 { 2346 dev->dv_driver_suspend = suspend; 2347 dev->dv_driver_resume = resume; 2348 dev->dv_driver_shutdown = shutdown; 2349 dev->dv_flags |= DVF_POWER_HANDLERS; 2350 return true; 2351 } 2352 2353 static const char * 2354 curlwp_name(void) 2355 { 2356 if (curlwp->l_name != NULL) 2357 return curlwp->l_name; 2358 else 2359 return curlwp->l_proc->p_comm; 2360 } 2361 2362 void 2363 device_pmf_driver_deregister(device_t dev) 2364 { 2365 device_lock_t dvl = device_getlock(dev); 2366 2367 dev->dv_driver_suspend = NULL; 2368 dev->dv_driver_resume = NULL; 2369 2370 mutex_enter(&dvl->dvl_mtx); 2371 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2372 while (dvl->dvl_nlock > 0 || dvl->dvl_nwait > 0) { 2373 /* Wake a thread that waits for the lock. That 2374 * thread will fail to acquire the lock, and then 2375 * it will wake the next thread that waits for the 2376 * lock, or else it will wake us. 2377 */ 2378 cv_signal(&dvl->dvl_cv); 2379 pmflock_debug(dev, __func__, __LINE__); 2380 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2381 pmflock_debug(dev, __func__, __LINE__); 2382 } 2383 mutex_exit(&dvl->dvl_mtx); 2384 } 2385 2386 bool 2387 device_pmf_driver_child_register(device_t dev) 2388 { 2389 device_t parent = device_parent(dev); 2390 2391 if (parent == NULL || parent->dv_driver_child_register == NULL) 2392 return true; 2393 return (*parent->dv_driver_child_register)(dev); 2394 } 2395 2396 void 2397 device_pmf_driver_set_child_register(device_t dev, 2398 bool (*child_register)(device_t)) 2399 { 2400 dev->dv_driver_child_register = child_register; 2401 } 2402 2403 static void 2404 pmflock_debug(device_t dev, const char *func, int line) 2405 { 2406 device_lock_t dvl = device_getlock(dev); 2407 2408 aprint_debug_dev(dev, 2409 "%s.%d, %s dvl_nlock %d dvl_nwait %d dv_flags %x\n", func, line, 2410 curlwp_name(), dvl->dvl_nlock, dvl->dvl_nwait, dev->dv_flags); 2411 } 2412 2413 static bool 2414 device_pmf_lock1(device_t dev) 2415 { 2416 device_lock_t dvl = device_getlock(dev); 2417 2418 while (device_pmf_is_registered(dev) && 2419 dvl->dvl_nlock > 0 && dvl->dvl_holder != curlwp) { 2420 dvl->dvl_nwait++; 2421 pmflock_debug(dev, __func__, __LINE__); 2422 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2423 pmflock_debug(dev, __func__, __LINE__); 2424 dvl->dvl_nwait--; 2425 } 2426 if (!device_pmf_is_registered(dev)) { 2427 pmflock_debug(dev, __func__, __LINE__); 2428 /* We could not acquire the lock, but some other thread may 2429 * wait for it, also. Wake that thread. 2430 */ 2431 cv_signal(&dvl->dvl_cv); 2432 return false; 2433 } 2434 dvl->dvl_nlock++; 2435 dvl->dvl_holder = curlwp; 2436 pmflock_debug(dev, __func__, __LINE__); 2437 return true; 2438 } 2439 2440 bool 2441 device_pmf_lock(device_t dev) 2442 { 2443 bool rc; 2444 device_lock_t dvl = device_getlock(dev); 2445 2446 mutex_enter(&dvl->dvl_mtx); 2447 rc = device_pmf_lock1(dev); 2448 mutex_exit(&dvl->dvl_mtx); 2449 2450 return rc; 2451 } 2452 2453 void 2454 device_pmf_unlock(device_t dev) 2455 { 2456 device_lock_t dvl = device_getlock(dev); 2457 2458 KASSERT(dvl->dvl_nlock > 0); 2459 mutex_enter(&dvl->dvl_mtx); 2460 if (--dvl->dvl_nlock == 0) 2461 dvl->dvl_holder = NULL; 2462 cv_signal(&dvl->dvl_cv); 2463 pmflock_debug(dev, __func__, __LINE__); 2464 mutex_exit(&dvl->dvl_mtx); 2465 } 2466 2467 device_lock_t 2468 device_getlock(device_t dev) 2469 { 2470 return &dev->dv_lock; 2471 } 2472 2473 void * 2474 device_pmf_bus_private(device_t dev) 2475 { 2476 return dev->dv_bus_private; 2477 } 2478 2479 bool 2480 device_pmf_bus_suspend(device_t dev, const pmf_qual_t *qual) 2481 { 2482 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2483 return true; 2484 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2485 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2486 return false; 2487 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2488 dev->dv_bus_suspend != NULL && 2489 !(*dev->dv_bus_suspend)(dev, qual)) 2490 return false; 2491 2492 dev->dv_flags |= DVF_BUS_SUSPENDED; 2493 return true; 2494 } 2495 2496 bool 2497 device_pmf_bus_resume(device_t dev, const pmf_qual_t *qual) 2498 { 2499 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2500 return true; 2501 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2502 dev->dv_bus_resume != NULL && 2503 !(*dev->dv_bus_resume)(dev, qual)) 2504 return false; 2505 2506 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2507 return true; 2508 } 2509 2510 bool 2511 device_pmf_bus_shutdown(device_t dev, int how) 2512 { 2513 2514 if (*dev->dv_bus_shutdown != NULL && 2515 !(*dev->dv_bus_shutdown)(dev, how)) 2516 return false; 2517 return true; 2518 } 2519 2520 void 2521 device_pmf_bus_register(device_t dev, void *priv, 2522 bool (*suspend)(device_t, const pmf_qual_t *), 2523 bool (*resume)(device_t, const pmf_qual_t *), 2524 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2525 { 2526 dev->dv_bus_private = priv; 2527 dev->dv_bus_resume = resume; 2528 dev->dv_bus_suspend = suspend; 2529 dev->dv_bus_shutdown = shutdown; 2530 dev->dv_bus_deregister = deregister; 2531 } 2532 2533 void 2534 device_pmf_bus_deregister(device_t dev) 2535 { 2536 if (dev->dv_bus_deregister == NULL) 2537 return; 2538 (*dev->dv_bus_deregister)(dev); 2539 dev->dv_bus_private = NULL; 2540 dev->dv_bus_suspend = NULL; 2541 dev->dv_bus_resume = NULL; 2542 dev->dv_bus_deregister = NULL; 2543 } 2544 2545 void * 2546 device_pmf_class_private(device_t dev) 2547 { 2548 return dev->dv_class_private; 2549 } 2550 2551 bool 2552 device_pmf_class_suspend(device_t dev, const pmf_qual_t *qual) 2553 { 2554 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2555 return true; 2556 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2557 dev->dv_class_suspend != NULL && 2558 !(*dev->dv_class_suspend)(dev, qual)) 2559 return false; 2560 2561 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2562 return true; 2563 } 2564 2565 bool 2566 device_pmf_class_resume(device_t dev, const pmf_qual_t *qual) 2567 { 2568 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2569 return true; 2570 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2571 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2572 return false; 2573 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2574 dev->dv_class_resume != NULL && 2575 !(*dev->dv_class_resume)(dev, qual)) 2576 return false; 2577 2578 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2579 return true; 2580 } 2581 2582 void 2583 device_pmf_class_register(device_t dev, void *priv, 2584 bool (*suspend)(device_t, const pmf_qual_t *), 2585 bool (*resume)(device_t, const pmf_qual_t *), 2586 void (*deregister)(device_t)) 2587 { 2588 dev->dv_class_private = priv; 2589 dev->dv_class_suspend = suspend; 2590 dev->dv_class_resume = resume; 2591 dev->dv_class_deregister = deregister; 2592 } 2593 2594 void 2595 device_pmf_class_deregister(device_t dev) 2596 { 2597 if (dev->dv_class_deregister == NULL) 2598 return; 2599 (*dev->dv_class_deregister)(dev); 2600 dev->dv_class_private = NULL; 2601 dev->dv_class_suspend = NULL; 2602 dev->dv_class_resume = NULL; 2603 dev->dv_class_deregister = NULL; 2604 } 2605 2606 bool 2607 device_active(device_t dev, devactive_t type) 2608 { 2609 size_t i; 2610 2611 if (dev->dv_activity_count == 0) 2612 return false; 2613 2614 for (i = 0; i < dev->dv_activity_count; ++i) { 2615 if (dev->dv_activity_handlers[i] == NULL) 2616 break; 2617 (*dev->dv_activity_handlers[i])(dev, type); 2618 } 2619 2620 return true; 2621 } 2622 2623 bool 2624 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2625 { 2626 void (**new_handlers)(device_t, devactive_t); 2627 void (**old_handlers)(device_t, devactive_t); 2628 size_t i, old_size, new_size; 2629 int s; 2630 2631 old_handlers = dev->dv_activity_handlers; 2632 old_size = dev->dv_activity_count; 2633 2634 KASSERT(old_size == 0 || old_handlers != NULL); 2635 2636 for (i = 0; i < old_size; ++i) { 2637 KASSERT(old_handlers[i] != handler); 2638 if (old_handlers[i] == NULL) { 2639 old_handlers[i] = handler; 2640 return true; 2641 } 2642 } 2643 2644 new_size = old_size + 4; 2645 new_handlers = kmem_alloc(sizeof(void *[new_size]), KM_SLEEP); 2646 2647 for (i = 0; i < old_size; ++i) 2648 new_handlers[i] = old_handlers[i]; 2649 new_handlers[old_size] = handler; 2650 for (i = old_size+1; i < new_size; ++i) 2651 new_handlers[i] = NULL; 2652 2653 s = splhigh(); 2654 dev->dv_activity_count = new_size; 2655 dev->dv_activity_handlers = new_handlers; 2656 splx(s); 2657 2658 if (old_size > 0) 2659 kmem_free(old_handlers, sizeof(void * [old_size])); 2660 2661 return true; 2662 } 2663 2664 void 2665 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2666 { 2667 void (**old_handlers)(device_t, devactive_t); 2668 size_t i, old_size; 2669 int s; 2670 2671 old_handlers = dev->dv_activity_handlers; 2672 old_size = dev->dv_activity_count; 2673 2674 for (i = 0; i < old_size; ++i) { 2675 if (old_handlers[i] == handler) 2676 break; 2677 if (old_handlers[i] == NULL) 2678 return; /* XXX panic? */ 2679 } 2680 2681 if (i == old_size) 2682 return; /* XXX panic? */ 2683 2684 for (; i < old_size - 1; ++i) { 2685 if ((old_handlers[i] = old_handlers[i + 1]) != NULL) 2686 continue; 2687 2688 if (i == 0) { 2689 s = splhigh(); 2690 dev->dv_activity_count = 0; 2691 dev->dv_activity_handlers = NULL; 2692 splx(s); 2693 kmem_free(old_handlers, sizeof(void *[old_size])); 2694 } 2695 return; 2696 } 2697 old_handlers[i] = NULL; 2698 } 2699 2700 /* Return true iff the device_t `dev' exists at generation `gen'. */ 2701 static bool 2702 device_exists_at(device_t dv, devgen_t gen) 2703 { 2704 return (dv->dv_del_gen == 0 || dv->dv_del_gen > gen) && 2705 dv->dv_add_gen <= gen; 2706 } 2707 2708 static bool 2709 deviter_visits(const deviter_t *di, device_t dv) 2710 { 2711 return device_exists_at(dv, di->di_gen); 2712 } 2713 2714 /* 2715 * Device Iteration 2716 * 2717 * deviter_t: a device iterator. Holds state for a "walk" visiting 2718 * each device_t's in the device tree. 2719 * 2720 * deviter_init(di, flags): initialize the device iterator `di' 2721 * to "walk" the device tree. deviter_next(di) will return 2722 * the first device_t in the device tree, or NULL if there are 2723 * no devices. 2724 * 2725 * `flags' is one or more of DEVITER_F_RW, indicating that the 2726 * caller intends to modify the device tree by calling 2727 * config_detach(9) on devices in the order that the iterator 2728 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2729 * nearest the "root" of the device tree to be returned, first; 2730 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2731 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2732 * indicating both that deviter_init() should not respect any 2733 * locks on the device tree, and that deviter_next(di) may run 2734 * in more than one LWP before the walk has finished. 2735 * 2736 * Only one DEVITER_F_RW iterator may be in the device tree at 2737 * once. 2738 * 2739 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2740 * 2741 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2742 * DEVITER_F_LEAVES_FIRST are used in combination. 2743 * 2744 * deviter_first(di, flags): initialize the device iterator `di' 2745 * and return the first device_t in the device tree, or NULL 2746 * if there are no devices. The statement 2747 * 2748 * dv = deviter_first(di); 2749 * 2750 * is shorthand for 2751 * 2752 * deviter_init(di); 2753 * dv = deviter_next(di); 2754 * 2755 * deviter_next(di): return the next device_t in the device tree, 2756 * or NULL if there are no more devices. deviter_next(di) 2757 * is undefined if `di' was not initialized with deviter_init() or 2758 * deviter_first(). 2759 * 2760 * deviter_release(di): stops iteration (subsequent calls to 2761 * deviter_next() will return NULL), releases any locks and 2762 * resources held by the device iterator. 2763 * 2764 * Device iteration does not return device_t's in any particular 2765 * order. An iterator will never return the same device_t twice. 2766 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2767 * is called repeatedly on the same `di', it will eventually return 2768 * NULL. It is ok to attach/detach devices during device iteration. 2769 */ 2770 void 2771 deviter_init(deviter_t *di, deviter_flags_t flags) 2772 { 2773 device_t dv; 2774 2775 memset(di, 0, sizeof(*di)); 2776 2777 if ((flags & DEVITER_F_SHUTDOWN) != 0) 2778 flags |= DEVITER_F_RW; 2779 2780 mutex_enter(&alldevs.lock); 2781 if ((flags & DEVITER_F_RW) != 0) 2782 alldevs.nwrite++; 2783 else 2784 alldevs.nread++; 2785 di->di_gen = alldevs.gen++; 2786 di->di_flags = flags; 2787 2788 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2789 case DEVITER_F_LEAVES_FIRST: 2790 TAILQ_FOREACH(dv, &alldevs.list, dv_list) { 2791 if (!deviter_visits(di, dv)) 2792 continue; 2793 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2794 } 2795 break; 2796 case DEVITER_F_ROOT_FIRST: 2797 TAILQ_FOREACH(dv, &alldevs.list, dv_list) { 2798 if (!deviter_visits(di, dv)) 2799 continue; 2800 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2801 } 2802 break; 2803 default: 2804 break; 2805 } 2806 2807 deviter_reinit(di); 2808 mutex_exit(&alldevs.lock); 2809 } 2810 2811 static void 2812 deviter_reinit(deviter_t *di) 2813 { 2814 2815 KASSERT(mutex_owned(&alldevs.lock)); 2816 if ((di->di_flags & DEVITER_F_RW) != 0) 2817 di->di_prev = TAILQ_LAST(&alldevs.list, devicelist); 2818 else 2819 di->di_prev = TAILQ_FIRST(&alldevs.list); 2820 } 2821 2822 device_t 2823 deviter_first(deviter_t *di, deviter_flags_t flags) 2824 { 2825 2826 deviter_init(di, flags); 2827 return deviter_next(di); 2828 } 2829 2830 static device_t 2831 deviter_next2(deviter_t *di) 2832 { 2833 device_t dv; 2834 2835 KASSERT(mutex_owned(&alldevs.lock)); 2836 2837 dv = di->di_prev; 2838 2839 if (dv == NULL) 2840 return NULL; 2841 2842 if ((di->di_flags & DEVITER_F_RW) != 0) 2843 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2844 else 2845 di->di_prev = TAILQ_NEXT(dv, dv_list); 2846 2847 return dv; 2848 } 2849 2850 static device_t 2851 deviter_next1(deviter_t *di) 2852 { 2853 device_t dv; 2854 2855 KASSERT(mutex_owned(&alldevs.lock)); 2856 2857 do { 2858 dv = deviter_next2(di); 2859 } while (dv != NULL && !deviter_visits(di, dv)); 2860 2861 return dv; 2862 } 2863 2864 device_t 2865 deviter_next(deviter_t *di) 2866 { 2867 device_t dv = NULL; 2868 2869 mutex_enter(&alldevs.lock); 2870 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2871 case 0: 2872 dv = deviter_next1(di); 2873 break; 2874 case DEVITER_F_LEAVES_FIRST: 2875 while (di->di_curdepth >= 0) { 2876 if ((dv = deviter_next1(di)) == NULL) { 2877 di->di_curdepth--; 2878 deviter_reinit(di); 2879 } else if (dv->dv_depth == di->di_curdepth) 2880 break; 2881 } 2882 break; 2883 case DEVITER_F_ROOT_FIRST: 2884 while (di->di_curdepth <= di->di_maxdepth) { 2885 if ((dv = deviter_next1(di)) == NULL) { 2886 di->di_curdepth++; 2887 deviter_reinit(di); 2888 } else if (dv->dv_depth == di->di_curdepth) 2889 break; 2890 } 2891 break; 2892 default: 2893 break; 2894 } 2895 mutex_exit(&alldevs.lock); 2896 2897 return dv; 2898 } 2899 2900 void 2901 deviter_release(deviter_t *di) 2902 { 2903 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 2904 2905 mutex_enter(&alldevs.lock); 2906 if (rw) 2907 --alldevs.nwrite; 2908 else 2909 --alldevs.nread; 2910 /* XXX wake a garbage-collection thread */ 2911 mutex_exit(&alldevs.lock); 2912 } 2913 2914 const char * 2915 cfdata_ifattr(const struct cfdata *cf) 2916 { 2917 return cf->cf_pspec->cfp_iattr; 2918 } 2919 2920 bool 2921 ifattr_match(const char *snull, const char *t) 2922 { 2923 return (snull == NULL) || strcmp(snull, t) == 0; 2924 } 2925 2926 void 2927 null_childdetached(device_t self, device_t child) 2928 { 2929 /* do nothing */ 2930 } 2931 2932 static void 2933 sysctl_detach_setup(struct sysctllog **clog) 2934 { 2935 2936 sysctl_createv(clog, 0, NULL, NULL, 2937 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 2938 CTLTYPE_BOOL, "detachall", 2939 SYSCTL_DESCR("Detach all devices at shutdown"), 2940 NULL, 0, &detachall, 0, 2941 CTL_KERN, CTL_CREATE, CTL_EOL); 2942 } 2943
Indexes created Sun Sep 28 12:09:53 GMT 2025