subr_autoconf.c revision 1.238
1 /* $NetBSD: subr_autoconf.c,v 1.238 2015/12/20 04:21:03 pgoyette 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 1.238 2015/12/20 04:21:03 pgoyette 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_unlock(int); 176 static int config_alldevs_lock(void); 177 static void config_alldevs_enter(struct alldevs_foray *); 178 static void config_alldevs_exit(struct alldevs_foray *); 179 static void config_add_attrib_dict(device_t); 180 181 static void config_collect_garbage(struct devicelist *); 182 static void config_dump_garbage(struct devicelist *); 183 184 static void pmflock_debug(device_t, const char *, int); 185 186 static device_t deviter_next1(deviter_t *); 187 static void deviter_reinit(deviter_t *); 188 189 struct deferred_config { 190 TAILQ_ENTRY(deferred_config) dc_queue; 191 device_t dc_dev; 192 void (*dc_func)(device_t); 193 }; 194 195 TAILQ_HEAD(deferred_config_head, deferred_config); 196 197 struct deferred_config_head deferred_config_queue = 198 TAILQ_HEAD_INITIALIZER(deferred_config_queue); 199 struct deferred_config_head interrupt_config_queue = 200 TAILQ_HEAD_INITIALIZER(interrupt_config_queue); 201 int interrupt_config_threads = 8; 202 struct deferred_config_head mountroot_config_queue = 203 TAILQ_HEAD_INITIALIZER(mountroot_config_queue); 204 int mountroot_config_threads = 2; 205 static lwp_t **mountroot_config_lwpids; 206 static size_t mountroot_config_lwpids_size; 207 static bool root_is_mounted = false; 208 209 static void config_process_deferred(struct deferred_config_head *, device_t); 210 211 /* Hooks to finalize configuration once all real devices have been found. */ 212 struct finalize_hook { 213 TAILQ_ENTRY(finalize_hook) f_list; 214 int (*f_func)(device_t); 215 device_t f_dev; 216 }; 217 static TAILQ_HEAD(, finalize_hook) config_finalize_list = 218 TAILQ_HEAD_INITIALIZER(config_finalize_list); 219 static int config_finalize_done; 220 221 /* list of all devices */ 222 static struct devicelist alldevs = TAILQ_HEAD_INITIALIZER(alldevs); 223 static kmutex_t alldevs_mtx; 224 static volatile bool alldevs_garbage = false; 225 static volatile devgen_t alldevs_gen = 1; 226 static volatile int alldevs_nread = 0; 227 static volatile int alldevs_nwrite = 0; 228 229 static int config_pending; /* semaphore for mountroot */ 230 static kmutex_t config_misc_lock; 231 static kcondvar_t config_misc_cv; 232 233 static bool detachall = false; 234 235 #define STREQ(s1, s2) \ 236 (*(s1) == *(s2) && strcmp((s1), (s2)) == 0) 237 238 static bool config_initialized = false; /* config_init() has been called. */ 239 240 static int config_do_twiddle; 241 static callout_t config_twiddle_ch; 242 243 static void sysctl_detach_setup(struct sysctllog **); 244 245 int no_devmon_insert(const char *, prop_dictionary_t); 246 int (*devmon_insert_vec)(const char *, prop_dictionary_t) = no_devmon_insert; 247 248 typedef int (*cfdriver_fn)(struct cfdriver *); 249 static int 250 frob_cfdrivervec(struct cfdriver * const *cfdriverv, 251 cfdriver_fn drv_do, cfdriver_fn drv_undo, 252 const char *style, bool dopanic) 253 { 254 void (*pr)(const char *, ...) __printflike(1, 2) = 255 dopanic ? panic : printf; 256 int i, error = 0, e2 __diagused; 257 258 for (i = 0; cfdriverv[i] != NULL; i++) { 259 if ((error = drv_do(cfdriverv[i])) != 0) { 260 pr("configure: `%s' driver %s failed: %d", 261 cfdriverv[i]->cd_name, style, error); 262 goto bad; 263 } 264 } 265 266 KASSERT(error == 0); 267 return 0; 268 269 bad: 270 printf("\n"); 271 for (i--; i >= 0; i--) { 272 e2 = drv_undo(cfdriverv[i]); 273 KASSERT(e2 == 0); 274 } 275 276 return error; 277 } 278 279 typedef int (*cfattach_fn)(const char *, struct cfattach *); 280 static int 281 frob_cfattachvec(const struct cfattachinit *cfattachv, 282 cfattach_fn att_do, cfattach_fn att_undo, 283 const char *style, bool dopanic) 284 { 285 const struct cfattachinit *cfai = NULL; 286 void (*pr)(const char *, ...) __printflike(1, 2) = 287 dopanic ? panic : printf; 288 int j = 0, error = 0, e2 __diagused; 289 290 for (cfai = &cfattachv[0]; cfai->cfai_name != NULL; cfai++) { 291 for (j = 0; cfai->cfai_list[j] != NULL; j++) { 292 if ((error = att_do(cfai->cfai_name, 293 cfai->cfai_list[j])) != 0) { 294 pr("configure: attachment `%s' " 295 "of `%s' driver %s failed: %d", 296 cfai->cfai_list[j]->ca_name, 297 cfai->cfai_name, style, error); 298 goto bad; 299 } 300 } 301 } 302 303 KASSERT(error == 0); 304 return 0; 305 306 bad: 307 /* 308 * Rollback in reverse order. dunno if super-important, but 309 * do that anyway. Although the code looks a little like 310 * someone did a little integration (in the math sense). 311 */ 312 printf("\n"); 313 if (cfai) { 314 bool last; 315 316 for (last = false; last == false; ) { 317 if (cfai == &cfattachv[0]) 318 last = true; 319 for (j--; j >= 0; j--) { 320 e2 = att_undo(cfai->cfai_name, 321 cfai->cfai_list[j]); 322 KASSERT(e2 == 0); 323 } 324 if (!last) { 325 cfai--; 326 for (j = 0; cfai->cfai_list[j] != NULL; j++) 327 ; 328 } 329 } 330 } 331 332 return error; 333 } 334 335 /* 336 * Initialize the autoconfiguration data structures. Normally this 337 * is done by configure(), but some platforms need to do this very 338 * early (to e.g. initialize the console). 339 */ 340 void 341 config_init(void) 342 { 343 344 KASSERT(config_initialized == false); 345 346 mutex_init(&alldevs_mtx, MUTEX_DEFAULT, IPL_VM); 347 348 mutex_init(&config_misc_lock, MUTEX_DEFAULT, IPL_NONE); 349 cv_init(&config_misc_cv, "cfgmisc"); 350 351 callout_init(&config_twiddle_ch, CALLOUT_MPSAFE); 352 353 frob_cfdrivervec(cfdriver_list_initial, 354 config_cfdriver_attach, NULL, "bootstrap", true); 355 frob_cfattachvec(cfattachinit, 356 config_cfattach_attach, NULL, "bootstrap", true); 357 358 initcftable.ct_cfdata = cfdata; 359 TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list); 360 361 config_initialized = true; 362 } 363 364 /* 365 * Init or fini drivers and attachments. Either all or none 366 * are processed (via rollback). It would be nice if this were 367 * atomic to outside consumers, but with the current state of 368 * locking ... 369 */ 370 int 371 config_init_component(struct cfdriver * const *cfdriverv, 372 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 373 { 374 int error; 375 376 if ((error = frob_cfdrivervec(cfdriverv, 377 config_cfdriver_attach, config_cfdriver_detach, "init", false))!= 0) 378 return error; 379 if ((error = frob_cfattachvec(cfattachv, 380 config_cfattach_attach, config_cfattach_detach, 381 "init", false)) != 0) { 382 frob_cfdrivervec(cfdriverv, 383 config_cfdriver_detach, NULL, "init rollback", true); 384 return error; 385 } 386 if ((error = config_cfdata_attach(cfdatav, 1)) != 0) { 387 frob_cfattachvec(cfattachv, 388 config_cfattach_detach, NULL, "init rollback", true); 389 frob_cfdrivervec(cfdriverv, 390 config_cfdriver_detach, NULL, "init rollback", true); 391 return error; 392 } 393 394 return 0; 395 } 396 397 int 398 config_fini_component(struct cfdriver * const *cfdriverv, 399 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 400 { 401 int error; 402 403 if ((error = config_cfdata_detach(cfdatav)) != 0) 404 return error; 405 if ((error = frob_cfattachvec(cfattachv, 406 config_cfattach_detach, config_cfattach_attach, 407 "fini", false)) != 0) { 408 if (config_cfdata_attach(cfdatav, 0) != 0) 409 panic("config_cfdata fini rollback failed"); 410 return error; 411 } 412 if ((error = frob_cfdrivervec(cfdriverv, 413 config_cfdriver_detach, config_cfdriver_attach, 414 "fini", false)) != 0) { 415 frob_cfattachvec(cfattachv, 416 config_cfattach_attach, NULL, "fini rollback", true); 417 if (config_cfdata_attach(cfdatav, 0) != 0) 418 panic("config_cfdata fini rollback failed"); 419 return error; 420 } 421 422 return 0; 423 } 424 425 void 426 config_init_mi(void) 427 { 428 429 if (!config_initialized) 430 config_init(); 431 432 sysctl_detach_setup(NULL); 433 } 434 435 void 436 config_deferred(device_t dev) 437 { 438 config_process_deferred(&deferred_config_queue, dev); 439 config_process_deferred(&interrupt_config_queue, dev); 440 config_process_deferred(&mountroot_config_queue, dev); 441 } 442 443 static void 444 config_interrupts_thread(void *cookie) 445 { 446 struct deferred_config *dc; 447 448 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 449 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 450 (*dc->dc_func)(dc->dc_dev); 451 config_pending_decr(dc->dc_dev); 452 kmem_free(dc, sizeof(*dc)); 453 } 454 kthread_exit(0); 455 } 456 457 void 458 config_create_interruptthreads(void) 459 { 460 int i; 461 462 for (i = 0; i < interrupt_config_threads; i++) { 463 (void)kthread_create(PRI_NONE, 0, NULL, 464 config_interrupts_thread, NULL, NULL, "configintr"); 465 } 466 } 467 468 static void 469 config_mountroot_thread(void *cookie) 470 { 471 struct deferred_config *dc; 472 473 while ((dc = TAILQ_FIRST(&mountroot_config_queue)) != NULL) { 474 TAILQ_REMOVE(&mountroot_config_queue, dc, dc_queue); 475 (*dc->dc_func)(dc->dc_dev); 476 kmem_free(dc, sizeof(*dc)); 477 } 478 kthread_exit(0); 479 } 480 481 void 482 config_create_mountrootthreads(void) 483 { 484 int i; 485 486 if (!root_is_mounted) 487 root_is_mounted = true; 488 489 mountroot_config_lwpids_size = sizeof(mountroot_config_lwpids) * 490 mountroot_config_threads; 491 mountroot_config_lwpids = kmem_alloc(mountroot_config_lwpids_size, 492 KM_NOSLEEP); 493 KASSERT(mountroot_config_lwpids); 494 for (i = 0; i < mountroot_config_threads; i++) { 495 mountroot_config_lwpids[i] = 0; 496 (void)kthread_create(PRI_NONE, KTHREAD_MUSTJOIN, NULL, 497 config_mountroot_thread, NULL, 498 &mountroot_config_lwpids[i], 499 "configroot"); 500 } 501 } 502 503 void 504 config_finalize_mountroot(void) 505 { 506 int i, error; 507 508 for (i = 0; i < mountroot_config_threads; i++) { 509 if (mountroot_config_lwpids[i] == 0) 510 continue; 511 512 error = kthread_join(mountroot_config_lwpids[i]); 513 if (error) 514 printf("%s: thread %x joined with error %d\n", 515 __func__, i, error); 516 } 517 kmem_free(mountroot_config_lwpids, mountroot_config_lwpids_size); 518 } 519 520 /* 521 * Announce device attach/detach to userland listeners. 522 */ 523 524 int 525 no_devmon_insert(const char *name, prop_dictionary_t p) 526 { 527 528 return ENODEV; 529 } 530 531 static void 532 devmon_report_device(device_t dev, bool isattach) 533 { 534 prop_dictionary_t ev; 535 const char *parent; 536 const char *what; 537 device_t pdev = device_parent(dev); 538 539 /* If currently no drvctl device, just return */ 540 if (devmon_insert_vec == no_devmon_insert) 541 return; 542 543 ev = prop_dictionary_create(); 544 if (ev == NULL) 545 return; 546 547 what = (isattach ? "device-attach" : "device-detach"); 548 parent = (pdev == NULL ? "root" : device_xname(pdev)); 549 if (!prop_dictionary_set_cstring(ev, "device", device_xname(dev)) || 550 !prop_dictionary_set_cstring(ev, "parent", parent)) { 551 prop_object_release(ev); 552 return; 553 } 554 555 if ((*devmon_insert_vec)(what, ev) != 0) 556 prop_object_release(ev); 557 } 558 559 /* 560 * Add a cfdriver to the system. 561 */ 562 int 563 config_cfdriver_attach(struct cfdriver *cd) 564 { 565 struct cfdriver *lcd; 566 567 /* Make sure this driver isn't already in the system. */ 568 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 569 if (STREQ(lcd->cd_name, cd->cd_name)) 570 return EEXIST; 571 } 572 573 LIST_INIT(&cd->cd_attach); 574 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 575 576 return 0; 577 } 578 579 /* 580 * Remove a cfdriver from the system. 581 */ 582 int 583 config_cfdriver_detach(struct cfdriver *cd) 584 { 585 struct alldevs_foray af; 586 int i, rc = 0; 587 588 config_alldevs_enter(&af); 589 /* Make sure there are no active instances. */ 590 for (i = 0; i < cd->cd_ndevs; i++) { 591 if (cd->cd_devs[i] != NULL) { 592 rc = EBUSY; 593 break; 594 } 595 } 596 config_alldevs_exit(&af); 597 598 if (rc != 0) 599 return rc; 600 601 /* ...and no attachments loaded. */ 602 if (LIST_EMPTY(&cd->cd_attach) == 0) 603 return EBUSY; 604 605 LIST_REMOVE(cd, cd_list); 606 607 KASSERT(cd->cd_devs == NULL); 608 609 return 0; 610 } 611 612 /* 613 * Look up a cfdriver by name. 614 */ 615 struct cfdriver * 616 config_cfdriver_lookup(const char *name) 617 { 618 struct cfdriver *cd; 619 620 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 621 if (STREQ(cd->cd_name, name)) 622 return cd; 623 } 624 625 return NULL; 626 } 627 628 /* 629 * Add a cfattach to the specified driver. 630 */ 631 int 632 config_cfattach_attach(const char *driver, struct cfattach *ca) 633 { 634 struct cfattach *lca; 635 struct cfdriver *cd; 636 637 cd = config_cfdriver_lookup(driver); 638 if (cd == NULL) 639 return ESRCH; 640 641 /* Make sure this attachment isn't already on this driver. */ 642 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 643 if (STREQ(lca->ca_name, ca->ca_name)) 644 return EEXIST; 645 } 646 647 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 648 649 return 0; 650 } 651 652 /* 653 * Remove a cfattach from the specified driver. 654 */ 655 int 656 config_cfattach_detach(const char *driver, struct cfattach *ca) 657 { 658 struct alldevs_foray af; 659 struct cfdriver *cd; 660 device_t dev; 661 int i, rc = 0; 662 663 cd = config_cfdriver_lookup(driver); 664 if (cd == NULL) 665 return ESRCH; 666 667 config_alldevs_enter(&af); 668 /* Make sure there are no active instances. */ 669 for (i = 0; i < cd->cd_ndevs; i++) { 670 if ((dev = cd->cd_devs[i]) == NULL) 671 continue; 672 if (dev->dv_cfattach == ca) { 673 rc = EBUSY; 674 break; 675 } 676 } 677 config_alldevs_exit(&af); 678 679 if (rc != 0) 680 return rc; 681 682 LIST_REMOVE(ca, ca_list); 683 684 return 0; 685 } 686 687 /* 688 * Look up a cfattach by name. 689 */ 690 static struct cfattach * 691 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 692 { 693 struct cfattach *ca; 694 695 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 696 if (STREQ(ca->ca_name, atname)) 697 return ca; 698 } 699 700 return NULL; 701 } 702 703 /* 704 * Look up a cfattach by driver/attachment name. 705 */ 706 struct cfattach * 707 config_cfattach_lookup(const char *name, const char *atname) 708 { 709 struct cfdriver *cd; 710 711 cd = config_cfdriver_lookup(name); 712 if (cd == NULL) 713 return NULL; 714 715 return config_cfattach_lookup_cd(cd, atname); 716 } 717 718 /* 719 * Apply the matching function and choose the best. This is used 720 * a few times and we want to keep the code small. 721 */ 722 static void 723 mapply(struct matchinfo *m, cfdata_t cf) 724 { 725 int pri; 726 727 if (m->fn != NULL) { 728 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 729 } else { 730 pri = config_match(m->parent, cf, m->aux); 731 } 732 if (pri > m->pri) { 733 m->match = cf; 734 m->pri = pri; 735 } 736 } 737 738 int 739 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 740 { 741 const struct cfiattrdata *ci; 742 const struct cflocdesc *cl; 743 int nlocs, i; 744 745 ci = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 746 KASSERT(ci); 747 nlocs = ci->ci_loclen; 748 KASSERT(!nlocs || locs); 749 for (i = 0; i < nlocs; i++) { 750 cl = &ci->ci_locdesc[i]; 751 if (cl->cld_defaultstr != NULL && 752 cf->cf_loc[i] == cl->cld_default) 753 continue; 754 if (cf->cf_loc[i] == locs[i]) 755 continue; 756 return 0; 757 } 758 759 return config_match(parent, cf, aux); 760 } 761 762 /* 763 * Helper function: check whether the driver supports the interface attribute 764 * and return its descriptor structure. 765 */ 766 static const struct cfiattrdata * 767 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 768 { 769 const struct cfiattrdata * const *cpp; 770 771 if (cd->cd_attrs == NULL) 772 return 0; 773 774 for (cpp = cd->cd_attrs; *cpp; cpp++) { 775 if (STREQ((*cpp)->ci_name, ia)) { 776 /* Match. */ 777 return *cpp; 778 } 779 } 780 return 0; 781 } 782 783 /* 784 * Lookup an interface attribute description by name. 785 * If the driver is given, consider only its supported attributes. 786 */ 787 const struct cfiattrdata * 788 cfiattr_lookup(const char *name, const struct cfdriver *cd) 789 { 790 const struct cfdriver *d; 791 const struct cfiattrdata *ia; 792 793 if (cd) 794 return cfdriver_get_iattr(cd, name); 795 796 LIST_FOREACH(d, &allcfdrivers, cd_list) { 797 ia = cfdriver_get_iattr(d, name); 798 if (ia) 799 return ia; 800 } 801 return 0; 802 } 803 804 /* 805 * Determine if `parent' is a potential parent for a device spec based 806 * on `cfp'. 807 */ 808 static int 809 cfparent_match(const device_t parent, const struct cfparent *cfp) 810 { 811 struct cfdriver *pcd; 812 813 /* We don't match root nodes here. */ 814 if (cfp == NULL) 815 return 0; 816 817 pcd = parent->dv_cfdriver; 818 KASSERT(pcd != NULL); 819 820 /* 821 * First, ensure this parent has the correct interface 822 * attribute. 823 */ 824 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 825 return 0; 826 827 /* 828 * If no specific parent device instance was specified (i.e. 829 * we're attaching to the attribute only), we're done! 830 */ 831 if (cfp->cfp_parent == NULL) 832 return 1; 833 834 /* 835 * Check the parent device's name. 836 */ 837 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 838 return 0; /* not the same parent */ 839 840 /* 841 * Make sure the unit number matches. 842 */ 843 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 844 cfp->cfp_unit == parent->dv_unit) 845 return 1; 846 847 /* Unit numbers don't match. */ 848 return 0; 849 } 850 851 /* 852 * Helper for config_cfdata_attach(): check all devices whether it could be 853 * parent any attachment in the config data table passed, and rescan. 854 */ 855 static void 856 rescan_with_cfdata(const struct cfdata *cf) 857 { 858 device_t d; 859 const struct cfdata *cf1; 860 deviter_t di; 861 862 863 /* 864 * "alldevs" is likely longer than a modules's cfdata, so make it 865 * the outer loop. 866 */ 867 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 868 869 if (!(d->dv_cfattach->ca_rescan)) 870 continue; 871 872 for (cf1 = cf; cf1->cf_name; cf1++) { 873 874 if (!cfparent_match(d, cf1->cf_pspec)) 875 continue; 876 877 (*d->dv_cfattach->ca_rescan)(d, 878 cfdata_ifattr(cf1), cf1->cf_loc); 879 880 config_deferred(d); 881 } 882 } 883 deviter_release(&di); 884 } 885 886 /* 887 * Attach a supplemental config data table and rescan potential 888 * parent devices if required. 889 */ 890 int 891 config_cfdata_attach(cfdata_t cf, int scannow) 892 { 893 struct cftable *ct; 894 895 ct = kmem_alloc(sizeof(*ct), KM_SLEEP); 896 ct->ct_cfdata = cf; 897 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 898 899 if (scannow) 900 rescan_with_cfdata(cf); 901 902 return 0; 903 } 904 905 /* 906 * Helper for config_cfdata_detach: check whether a device is 907 * found through any attachment in the config data table. 908 */ 909 static int 910 dev_in_cfdata(device_t d, cfdata_t cf) 911 { 912 const struct cfdata *cf1; 913 914 for (cf1 = cf; cf1->cf_name; cf1++) 915 if (d->dv_cfdata == cf1) 916 return 1; 917 918 return 0; 919 } 920 921 /* 922 * Detach a supplemental config data table. Detach all devices found 923 * through that table (and thus keeping references to it) before. 924 */ 925 int 926 config_cfdata_detach(cfdata_t cf) 927 { 928 device_t d; 929 int error = 0; 930 struct cftable *ct; 931 deviter_t di; 932 933 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 934 d = deviter_next(&di)) { 935 if (!dev_in_cfdata(d, cf)) 936 continue; 937 if ((error = config_detach(d, 0)) != 0) 938 break; 939 } 940 deviter_release(&di); 941 if (error) { 942 aprint_error_dev(d, "unable to detach instance\n"); 943 return error; 944 } 945 946 TAILQ_FOREACH(ct, &allcftables, ct_list) { 947 if (ct->ct_cfdata == cf) { 948 TAILQ_REMOVE(&allcftables, ct, ct_list); 949 kmem_free(ct, sizeof(*ct)); 950 return 0; 951 } 952 } 953 954 /* not found -- shouldn't happen */ 955 return EINVAL; 956 } 957 958 /* 959 * Invoke the "match" routine for a cfdata entry on behalf of 960 * an external caller, usually a "submatch" routine. 961 */ 962 int 963 config_match(device_t parent, cfdata_t cf, void *aux) 964 { 965 struct cfattach *ca; 966 967 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 968 if (ca == NULL) { 969 /* No attachment for this entry, oh well. */ 970 return 0; 971 } 972 973 return (*ca->ca_match)(parent, cf, aux); 974 } 975 976 /* 977 * Iterate over all potential children of some device, calling the given 978 * function (default being the child's match function) for each one. 979 * Nonzero returns are matches; the highest value returned is considered 980 * the best match. Return the `found child' if we got a match, or NULL 981 * otherwise. The `aux' pointer is simply passed on through. 982 * 983 * Note that this function is designed so that it can be used to apply 984 * an arbitrary function to all potential children (its return value 985 * can be ignored). 986 */ 987 cfdata_t 988 config_search_loc(cfsubmatch_t fn, device_t parent, 989 const char *ifattr, const int *locs, void *aux) 990 { 991 struct cftable *ct; 992 cfdata_t cf; 993 struct matchinfo m; 994 995 KASSERT(config_initialized); 996 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 997 998 m.fn = fn; 999 m.parent = parent; 1000 m.locs = locs; 1001 m.aux = aux; 1002 m.match = NULL; 1003 m.pri = 0; 1004 1005 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1006 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1007 1008 /* We don't match root nodes here. */ 1009 if (!cf->cf_pspec) 1010 continue; 1011 1012 /* 1013 * Skip cf if no longer eligible, otherwise scan 1014 * through parents for one matching `parent', and 1015 * try match function. 1016 */ 1017 if (cf->cf_fstate == FSTATE_FOUND) 1018 continue; 1019 if (cf->cf_fstate == FSTATE_DNOTFOUND || 1020 cf->cf_fstate == FSTATE_DSTAR) 1021 continue; 1022 1023 /* 1024 * If an interface attribute was specified, 1025 * consider only children which attach to 1026 * that attribute. 1027 */ 1028 if (ifattr && !STREQ(ifattr, cfdata_ifattr(cf))) 1029 continue; 1030 1031 if (cfparent_match(parent, cf->cf_pspec)) 1032 mapply(&m, cf); 1033 } 1034 } 1035 return m.match; 1036 } 1037 1038 cfdata_t 1039 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 1040 void *aux) 1041 { 1042 1043 return config_search_loc(fn, parent, ifattr, NULL, aux); 1044 } 1045 1046 /* 1047 * Find the given root device. 1048 * This is much like config_search, but there is no parent. 1049 * Don't bother with multiple cfdata tables; the root node 1050 * must always be in the initial table. 1051 */ 1052 cfdata_t 1053 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 1054 { 1055 cfdata_t cf; 1056 const short *p; 1057 struct matchinfo m; 1058 1059 m.fn = fn; 1060 m.parent = ROOT; 1061 m.aux = aux; 1062 m.match = NULL; 1063 m.pri = 0; 1064 m.locs = 0; 1065 /* 1066 * Look at root entries for matching name. We do not bother 1067 * with found-state here since only one root should ever be 1068 * searched (and it must be done first). 1069 */ 1070 for (p = cfroots; *p >= 0; p++) { 1071 cf = &cfdata[*p]; 1072 if (strcmp(cf->cf_name, rootname) == 0) 1073 mapply(&m, cf); 1074 } 1075 return m.match; 1076 } 1077 1078 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 1079 1080 /* 1081 * The given `aux' argument describes a device that has been found 1082 * on the given parent, but not necessarily configured. Locate the 1083 * configuration data for that device (using the submatch function 1084 * provided, or using candidates' cd_match configuration driver 1085 * functions) and attach it, and return its device_t. If the device was 1086 * not configured, call the given `print' function and return NULL. 1087 */ 1088 device_t 1089 config_found_sm_loc(device_t parent, 1090 const char *ifattr, const int *locs, void *aux, 1091 cfprint_t print, cfsubmatch_t submatch) 1092 { 1093 cfdata_t cf; 1094 1095 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 1096 return(config_attach_loc(parent, cf, locs, aux, print)); 1097 if (print) { 1098 if (config_do_twiddle && cold) 1099 twiddle(); 1100 aprint_normal("%s", msgs[(*print)(aux, device_xname(parent))]); 1101 } 1102 1103 /* 1104 * This has the effect of mixing in a single timestamp to the 1105 * entropy pool. Experiments indicate the estimator will almost 1106 * always attribute one bit of entropy to this sample; analysis 1107 * of device attach/detach timestamps on FreeBSD indicates 4 1108 * bits of entropy/sample so this seems appropriately conservative. 1109 */ 1110 rnd_add_uint32(&rnd_autoconf_source, 0); 1111 return NULL; 1112 } 1113 1114 device_t 1115 config_found_ia(device_t parent, const char *ifattr, void *aux, 1116 cfprint_t print) 1117 { 1118 1119 return config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL); 1120 } 1121 1122 device_t 1123 config_found(device_t parent, void *aux, cfprint_t print) 1124 { 1125 1126 return config_found_sm_loc(parent, NULL, NULL, aux, print, NULL); 1127 } 1128 1129 /* 1130 * As above, but for root devices. 1131 */ 1132 device_t 1133 config_rootfound(const char *rootname, void *aux) 1134 { 1135 cfdata_t cf; 1136 1137 if ((cf = config_rootsearch(NULL, rootname, aux)) != NULL) 1138 return config_attach(ROOT, cf, aux, NULL); 1139 aprint_error("root device %s not configured\n", rootname); 1140 return NULL; 1141 } 1142 1143 /* just like sprintf(buf, "%d") except that it works from the end */ 1144 static char * 1145 number(char *ep, int n) 1146 { 1147 1148 *--ep = 0; 1149 while (n >= 10) { 1150 *--ep = (n % 10) + '0'; 1151 n /= 10; 1152 } 1153 *--ep = n + '0'; 1154 return ep; 1155 } 1156 1157 /* 1158 * Expand the size of the cd_devs array if necessary. 1159 * 1160 * The caller must hold alldevs_mtx. config_makeroom() may release and 1161 * re-acquire alldevs_mtx, so callers should re-check conditions such 1162 * as alldevs_nwrite == 0 and alldevs_nread == 0 when config_makeroom() 1163 * returns. 1164 */ 1165 static void 1166 config_makeroom(int n, struct cfdriver *cd) 1167 { 1168 int ondevs, nndevs; 1169 device_t *osp, *nsp; 1170 1171 alldevs_nwrite++; 1172 1173 for (nndevs = MAX(4, cd->cd_ndevs); nndevs <= n; nndevs += nndevs) 1174 ; 1175 1176 while (n >= cd->cd_ndevs) { 1177 /* 1178 * Need to expand the array. 1179 */ 1180 ondevs = cd->cd_ndevs; 1181 osp = cd->cd_devs; 1182 1183 /* Release alldevs_mtx around allocation, which may 1184 * sleep. 1185 */ 1186 mutex_exit(&alldevs_mtx); 1187 nsp = kmem_alloc(sizeof(device_t[nndevs]), KM_SLEEP); 1188 if (nsp == NULL) 1189 panic("%s: could not expand cd_devs", __func__); 1190 mutex_enter(&alldevs_mtx); 1191 1192 /* If another thread moved the array while we did 1193 * not hold alldevs_mtx, try again. 1194 */ 1195 if (cd->cd_devs != osp) { 1196 mutex_exit(&alldevs_mtx); 1197 kmem_free(nsp, sizeof(device_t[nndevs])); 1198 mutex_enter(&alldevs_mtx); 1199 continue; 1200 } 1201 1202 memset(nsp + ondevs, 0, sizeof(device_t[nndevs - ondevs])); 1203 if (ondevs != 0) 1204 memcpy(nsp, cd->cd_devs, sizeof(device_t[ondevs])); 1205 1206 cd->cd_ndevs = nndevs; 1207 cd->cd_devs = nsp; 1208 if (ondevs != 0) { 1209 mutex_exit(&alldevs_mtx); 1210 kmem_free(osp, sizeof(device_t[ondevs])); 1211 mutex_enter(&alldevs_mtx); 1212 } 1213 } 1214 alldevs_nwrite--; 1215 } 1216 1217 /* 1218 * Put dev into the devices list. 1219 */ 1220 static void 1221 config_devlink(device_t dev) 1222 { 1223 int s; 1224 1225 s = config_alldevs_lock(); 1226 1227 KASSERT(device_cfdriver(dev)->cd_devs[dev->dv_unit] == dev); 1228 1229 dev->dv_add_gen = alldevs_gen; 1230 /* It is safe to add a device to the tail of the list while 1231 * readers and writers are in the list. 1232 */ 1233 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); 1234 config_alldevs_unlock(s); 1235 } 1236 1237 static void 1238 config_devfree(device_t dev) 1239 { 1240 int priv = (dev->dv_flags & DVF_PRIV_ALLOC); 1241 1242 if (dev->dv_cfattach->ca_devsize > 0) 1243 kmem_free(dev->dv_private, dev->dv_cfattach->ca_devsize); 1244 if (priv) 1245 kmem_free(dev, sizeof(*dev)); 1246 } 1247 1248 /* 1249 * Caller must hold alldevs_mtx. 1250 */ 1251 static void 1252 config_devunlink(device_t dev, struct devicelist *garbage) 1253 { 1254 struct device_garbage *dg = &dev->dv_garbage; 1255 cfdriver_t cd = device_cfdriver(dev); 1256 int i; 1257 1258 KASSERT(mutex_owned(&alldevs_mtx)); 1259 1260 /* Unlink from device list. Link to garbage list. */ 1261 TAILQ_REMOVE(&alldevs, dev, dv_list); 1262 TAILQ_INSERT_TAIL(garbage, dev, dv_list); 1263 1264 /* Remove from cfdriver's array. */ 1265 cd->cd_devs[dev->dv_unit] = NULL; 1266 1267 /* 1268 * If the device now has no units in use, unlink its softc array. 1269 */ 1270 for (i = 0; i < cd->cd_ndevs; i++) { 1271 if (cd->cd_devs[i] != NULL) 1272 break; 1273 } 1274 /* Nothing found. Unlink, now. Deallocate, later. */ 1275 if (i == cd->cd_ndevs) { 1276 dg->dg_ndevs = cd->cd_ndevs; 1277 dg->dg_devs = cd->cd_devs; 1278 cd->cd_devs = NULL; 1279 cd->cd_ndevs = 0; 1280 } 1281 } 1282 1283 static void 1284 config_devdelete(device_t dev) 1285 { 1286 struct device_garbage *dg = &dev->dv_garbage; 1287 device_lock_t dvl = device_getlock(dev); 1288 1289 if (dg->dg_devs != NULL) 1290 kmem_free(dg->dg_devs, sizeof(device_t[dg->dg_ndevs])); 1291 1292 cv_destroy(&dvl->dvl_cv); 1293 mutex_destroy(&dvl->dvl_mtx); 1294 1295 KASSERT(dev->dv_properties != NULL); 1296 prop_object_release(dev->dv_properties); 1297 1298 if (dev->dv_activity_handlers) 1299 panic("%s with registered handlers", __func__); 1300 1301 if (dev->dv_locators) { 1302 size_t amount = *--dev->dv_locators; 1303 kmem_free(dev->dv_locators, amount); 1304 } 1305 1306 config_devfree(dev); 1307 } 1308 1309 static int 1310 config_unit_nextfree(cfdriver_t cd, cfdata_t cf) 1311 { 1312 int unit; 1313 1314 if (cf->cf_fstate == FSTATE_STAR) { 1315 for (unit = cf->cf_unit; unit < cd->cd_ndevs; unit++) 1316 if (cd->cd_devs[unit] == NULL) 1317 break; 1318 /* 1319 * unit is now the unit of the first NULL device pointer, 1320 * or max(cd->cd_ndevs,cf->cf_unit). 1321 */ 1322 } else { 1323 unit = cf->cf_unit; 1324 if (unit < cd->cd_ndevs && cd->cd_devs[unit] != NULL) 1325 unit = -1; 1326 } 1327 return unit; 1328 } 1329 1330 static int 1331 config_unit_alloc(device_t dev, cfdriver_t cd, cfdata_t cf) 1332 { 1333 struct alldevs_foray af; 1334 int unit; 1335 1336 config_alldevs_enter(&af); 1337 for (;;) { 1338 unit = config_unit_nextfree(cd, cf); 1339 if (unit == -1) 1340 break; 1341 if (unit < cd->cd_ndevs) { 1342 cd->cd_devs[unit] = dev; 1343 dev->dv_unit = unit; 1344 break; 1345 } 1346 config_makeroom(unit, cd); 1347 } 1348 config_alldevs_exit(&af); 1349 1350 return unit; 1351 } 1352 1353 static device_t 1354 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1355 { 1356 cfdriver_t cd; 1357 cfattach_t ca; 1358 size_t lname, lunit; 1359 const char *xunit; 1360 int myunit; 1361 char num[10]; 1362 device_t dev; 1363 void *dev_private; 1364 const struct cfiattrdata *ia; 1365 device_lock_t dvl; 1366 1367 cd = config_cfdriver_lookup(cf->cf_name); 1368 if (cd == NULL) 1369 return NULL; 1370 1371 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1372 if (ca == NULL) 1373 return NULL; 1374 1375 if ((ca->ca_flags & DVF_PRIV_ALLOC) == 0 && 1376 ca->ca_devsize < sizeof(struct device)) 1377 panic("config_devalloc: %s (%zu < %zu)", cf->cf_atname, 1378 ca->ca_devsize, sizeof(struct device)); 1379 1380 /* get memory for all device vars */ 1381 KASSERT((ca->ca_flags & DVF_PRIV_ALLOC) || ca->ca_devsize >= sizeof(struct device)); 1382 if (ca->ca_devsize > 0) { 1383 dev_private = kmem_zalloc(ca->ca_devsize, KM_SLEEP); 1384 if (dev_private == NULL) 1385 panic("config_devalloc: memory allocation for device softc failed"); 1386 } else { 1387 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1388 dev_private = NULL; 1389 } 1390 1391 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1392 dev = kmem_zalloc(sizeof(*dev), KM_SLEEP); 1393 } else { 1394 dev = dev_private; 1395 #ifdef DIAGNOSTIC 1396 printf("%s has not been converted to device_t\n", cd->cd_name); 1397 #endif 1398 } 1399 if (dev == NULL) 1400 panic("config_devalloc: memory allocation for device_t failed"); 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 else 1435 dev->dv_depth = 0; 1436 dev->dv_flags |= DVF_ACTIVE; /* always initially active */ 1437 if (locs) { 1438 KASSERT(parent); /* no locators at root */ 1439 ia = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 1440 dev->dv_locators = 1441 kmem_alloc(sizeof(int [ia->ci_loclen + 1]), KM_SLEEP); 1442 *dev->dv_locators++ = sizeof(int [ia->ci_loclen + 1]); 1443 memcpy(dev->dv_locators, locs, sizeof(int [ia->ci_loclen])); 1444 } 1445 dev->dv_properties = prop_dictionary_create(); 1446 KASSERT(dev->dv_properties != NULL); 1447 1448 prop_dictionary_set_cstring_nocopy(dev->dv_properties, 1449 "device-driver", dev->dv_cfdriver->cd_name); 1450 prop_dictionary_set_uint16(dev->dv_properties, 1451 "device-unit", dev->dv_unit); 1452 if (parent != NULL) { 1453 prop_dictionary_set_cstring(dev->dv_properties, 1454 "device-parent", device_xname(parent)); 1455 } 1456 1457 if (dev->dv_cfdriver->cd_attrs != NULL) 1458 config_add_attrib_dict(dev); 1459 1460 return dev; 1461 } 1462 1463 /* 1464 * Create an array of device attach attributes and add it 1465 * to the device's dv_properties dictionary. 1466 * 1467 * <key>interface-attributes</key> 1468 * <array> 1469 * <dict> 1470 * <key>attribute-name</key> 1471 * <string>foo</string> 1472 * <key>locators</key> 1473 * <array> 1474 * <dict> 1475 * <key>loc-name</key> 1476 * <string>foo-loc1</string> 1477 * </dict> 1478 * <dict> 1479 * <key>loc-name</key> 1480 * <string>foo-loc2</string> 1481 * <key>default</key> 1482 * <string>foo-loc2-default</string> 1483 * </dict> 1484 * ... 1485 * </array> 1486 * </dict> 1487 * ... 1488 * </array> 1489 */ 1490 1491 static void 1492 config_add_attrib_dict(device_t dev) 1493 { 1494 int i, j; 1495 const struct cfiattrdata *ci; 1496 prop_dictionary_t attr_dict, loc_dict; 1497 prop_array_t attr_array, loc_array; 1498 1499 if ((attr_array = prop_array_create()) == NULL) 1500 return; 1501 1502 for (i = 0; ; i++) { 1503 if ((ci = dev->dv_cfdriver->cd_attrs[i]) == NULL) 1504 break; 1505 if ((attr_dict = prop_dictionary_create()) == NULL) 1506 break; 1507 prop_dictionary_set_cstring_nocopy(attr_dict, "attribute-name", 1508 ci->ci_name); 1509 1510 /* Create an array of the locator names and defaults */ 1511 1512 if (ci->ci_loclen != 0 && 1513 (loc_array = prop_array_create()) != NULL) { 1514 for (j = 0; j < ci->ci_loclen; j++) { 1515 loc_dict = prop_dictionary_create(); 1516 if (loc_dict == NULL) 1517 continue; 1518 prop_dictionary_set_cstring_nocopy(loc_dict, 1519 "loc-name", ci->ci_locdesc[j].cld_name); 1520 if (ci->ci_locdesc[j].cld_defaultstr != NULL) 1521 prop_dictionary_set_cstring_nocopy( 1522 loc_dict, "default", 1523 ci->ci_locdesc[j].cld_defaultstr); 1524 prop_array_set(loc_array, j, loc_dict); 1525 prop_object_release(loc_dict); 1526 } 1527 prop_dictionary_set_and_rel(attr_dict, "locators", 1528 loc_array); 1529 } 1530 prop_array_add(attr_array, attr_dict); 1531 prop_object_release(attr_dict); 1532 } 1533 if (i == 0) 1534 prop_object_release(attr_array); 1535 else 1536 prop_dictionary_set_and_rel(dev->dv_properties, 1537 "interface-attributes", attr_array); 1538 1539 return; 1540 } 1541 1542 /* 1543 * Attach a found device. 1544 */ 1545 device_t 1546 config_attach_loc(device_t parent, cfdata_t cf, 1547 const int *locs, void *aux, cfprint_t print) 1548 { 1549 device_t dev; 1550 struct cftable *ct; 1551 const char *drvname; 1552 1553 dev = config_devalloc(parent, cf, locs); 1554 if (!dev) 1555 panic("config_attach: allocation of device softc failed"); 1556 1557 /* XXX redundant - see below? */ 1558 if (cf->cf_fstate != FSTATE_STAR) { 1559 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1560 cf->cf_fstate = FSTATE_FOUND; 1561 } 1562 1563 config_devlink(dev); 1564 1565 if (config_do_twiddle && cold) 1566 twiddle(); 1567 else 1568 aprint_naive("Found "); 1569 /* 1570 * We want the next two printfs for normal, verbose, and quiet, 1571 * but not silent (in which case, we're twiddling, instead). 1572 */ 1573 if (parent == ROOT) { 1574 aprint_naive("%s (root)", device_xname(dev)); 1575 aprint_normal("%s (root)", device_xname(dev)); 1576 } else { 1577 aprint_naive("%s at %s", device_xname(dev), device_xname(parent)); 1578 aprint_normal("%s at %s", device_xname(dev), device_xname(parent)); 1579 if (print) 1580 (void) (*print)(aux, NULL); 1581 } 1582 1583 /* 1584 * Before attaching, clobber any unfound devices that are 1585 * otherwise identical. 1586 * XXX code above is redundant? 1587 */ 1588 drvname = dev->dv_cfdriver->cd_name; 1589 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1590 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1591 if (STREQ(cf->cf_name, drvname) && 1592 cf->cf_unit == dev->dv_unit) { 1593 if (cf->cf_fstate == FSTATE_NOTFOUND) 1594 cf->cf_fstate = FSTATE_FOUND; 1595 } 1596 } 1597 } 1598 device_register(dev, aux); 1599 1600 /* Let userland know */ 1601 devmon_report_device(dev, true); 1602 1603 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1604 1605 if (!device_pmf_is_registered(dev)) 1606 aprint_debug_dev(dev, "WARNING: power management not supported\n"); 1607 1608 config_process_deferred(&deferred_config_queue, dev); 1609 1610 device_register_post_config(dev, aux); 1611 return dev; 1612 } 1613 1614 device_t 1615 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1616 { 1617 1618 return config_attach_loc(parent, cf, NULL, aux, print); 1619 } 1620 1621 /* 1622 * As above, but for pseudo-devices. Pseudo-devices attached in this 1623 * way are silently inserted into the device tree, and their children 1624 * attached. 1625 * 1626 * Note that because pseudo-devices are attached silently, any information 1627 * the attach routine wishes to print should be prefixed with the device 1628 * name by the attach routine. 1629 */ 1630 device_t 1631 config_attach_pseudo(cfdata_t cf) 1632 { 1633 device_t dev; 1634 1635 dev = config_devalloc(ROOT, cf, NULL); 1636 if (!dev) 1637 return NULL; 1638 1639 /* XXX mark busy in cfdata */ 1640 1641 if (cf->cf_fstate != FSTATE_STAR) { 1642 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1643 cf->cf_fstate = FSTATE_FOUND; 1644 } 1645 1646 config_devlink(dev); 1647 1648 #if 0 /* XXXJRT not yet */ 1649 device_register(dev, NULL); /* like a root node */ 1650 #endif 1651 1652 /* Let userland know */ 1653 devmon_report_device(dev, true); 1654 1655 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1656 1657 config_process_deferred(&deferred_config_queue, dev); 1658 return dev; 1659 } 1660 1661 /* 1662 * Caller must hold alldevs_mtx. 1663 */ 1664 static void 1665 config_collect_garbage(struct devicelist *garbage) 1666 { 1667 device_t dv; 1668 1669 KASSERT(!cpu_intr_p()); 1670 KASSERT(!cpu_softintr_p()); 1671 KASSERT(mutex_owned(&alldevs_mtx)); 1672 1673 while (alldevs_nwrite == 0 && alldevs_nread == 0 && alldevs_garbage) { 1674 TAILQ_FOREACH(dv, &alldevs, dv_list) { 1675 if (dv->dv_del_gen != 0) 1676 break; 1677 } 1678 if (dv == NULL) { 1679 alldevs_garbage = false; 1680 break; 1681 } 1682 config_devunlink(dv, garbage); 1683 } 1684 KASSERT(mutex_owned(&alldevs_mtx)); 1685 } 1686 1687 static void 1688 config_dump_garbage(struct devicelist *garbage) 1689 { 1690 device_t dv; 1691 1692 while ((dv = TAILQ_FIRST(garbage)) != NULL) { 1693 TAILQ_REMOVE(garbage, dv, dv_list); 1694 config_devdelete(dv); 1695 } 1696 } 1697 1698 /* 1699 * Detach a device. Optionally forced (e.g. because of hardware 1700 * removal) and quiet. Returns zero if successful, non-zero 1701 * (an error code) otherwise. 1702 * 1703 * Note that this code wants to be run from a process context, so 1704 * that the detach can sleep to allow processes which have a device 1705 * open to run and unwind their stacks. 1706 */ 1707 int 1708 config_detach(device_t dev, int flags) 1709 { 1710 struct alldevs_foray af; 1711 struct cftable *ct; 1712 cfdata_t cf; 1713 const struct cfattach *ca; 1714 struct cfdriver *cd; 1715 #ifdef DIAGNOSTIC 1716 device_t d; 1717 #endif 1718 int rv = 0, s; 1719 1720 #ifdef DIAGNOSTIC 1721 cf = dev->dv_cfdata; 1722 if (cf != NULL && cf->cf_fstate != FSTATE_FOUND && 1723 cf->cf_fstate != FSTATE_STAR) 1724 panic("config_detach: %s: bad device fstate %d", 1725 device_xname(dev), cf ? cf->cf_fstate : -1); 1726 #endif 1727 cd = dev->dv_cfdriver; 1728 KASSERT(cd != NULL); 1729 1730 ca = dev->dv_cfattach; 1731 KASSERT(ca != NULL); 1732 1733 s = config_alldevs_lock(); 1734 if (dev->dv_del_gen != 0) { 1735 config_alldevs_unlock(s); 1736 #ifdef DIAGNOSTIC 1737 printf("%s: %s is already detached\n", __func__, 1738 device_xname(dev)); 1739 #endif /* DIAGNOSTIC */ 1740 return ENOENT; 1741 } 1742 alldevs_nwrite++; 1743 config_alldevs_unlock(s); 1744 1745 if (!detachall && 1746 (flags & (DETACH_SHUTDOWN|DETACH_FORCE)) == DETACH_SHUTDOWN && 1747 (dev->dv_flags & DVF_DETACH_SHUTDOWN) == 0) { 1748 rv = EOPNOTSUPP; 1749 } else if (ca->ca_detach != NULL) { 1750 rv = (*ca->ca_detach)(dev, flags); 1751 } else 1752 rv = EOPNOTSUPP; 1753 1754 /* 1755 * If it was not possible to detach the device, then we either 1756 * panic() (for the forced but failed case), or return an error. 1757 * 1758 * If it was possible to detach the device, ensure that the 1759 * device is deactivated. 1760 */ 1761 if (rv == 0) 1762 dev->dv_flags &= ~DVF_ACTIVE; 1763 else if ((flags & DETACH_FORCE) == 0) 1764 goto out; 1765 else { 1766 panic("config_detach: forced detach of %s failed (%d)", 1767 device_xname(dev), rv); 1768 } 1769 1770 /* 1771 * The device has now been successfully detached. 1772 */ 1773 1774 /* Let userland know */ 1775 devmon_report_device(dev, false); 1776 1777 #ifdef DIAGNOSTIC 1778 /* 1779 * Sanity: If you're successfully detached, you should have no 1780 * children. (Note that because children must be attached 1781 * after parents, we only need to search the latter part of 1782 * the list.) 1783 */ 1784 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1785 d = TAILQ_NEXT(d, dv_list)) { 1786 if (d->dv_parent == dev && d->dv_del_gen == 0) { 1787 printf("config_detach: detached device %s" 1788 " has children %s\n", device_xname(dev), device_xname(d)); 1789 panic("config_detach"); 1790 } 1791 } 1792 #endif 1793 1794 /* notify the parent that the child is gone */ 1795 if (dev->dv_parent) { 1796 device_t p = dev->dv_parent; 1797 if (p->dv_cfattach->ca_childdetached) 1798 (*p->dv_cfattach->ca_childdetached)(p, dev); 1799 } 1800 1801 /* 1802 * Mark cfdata to show that the unit can be reused, if possible. 1803 */ 1804 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1805 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1806 if (STREQ(cf->cf_name, cd->cd_name)) { 1807 if (cf->cf_fstate == FSTATE_FOUND && 1808 cf->cf_unit == dev->dv_unit) 1809 cf->cf_fstate = FSTATE_NOTFOUND; 1810 } 1811 } 1812 } 1813 1814 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1815 aprint_normal_dev(dev, "detached\n"); 1816 1817 out: 1818 config_alldevs_enter(&af); 1819 KASSERT(alldevs_nwrite != 0); 1820 --alldevs_nwrite; 1821 if (rv == 0 && dev->dv_del_gen == 0) { 1822 if (alldevs_nwrite == 0 && alldevs_nread == 0) 1823 config_devunlink(dev, &af.af_garbage); 1824 else { 1825 dev->dv_del_gen = alldevs_gen; 1826 alldevs_garbage = true; 1827 } 1828 } 1829 config_alldevs_exit(&af); 1830 1831 return rv; 1832 } 1833 1834 int 1835 config_detach_children(device_t parent, int flags) 1836 { 1837 device_t dv; 1838 deviter_t di; 1839 int error = 0; 1840 1841 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1842 dv = deviter_next(&di)) { 1843 if (device_parent(dv) != parent) 1844 continue; 1845 if ((error = config_detach(dv, flags)) != 0) 1846 break; 1847 } 1848 deviter_release(&di); 1849 return error; 1850 } 1851 1852 device_t 1853 shutdown_first(struct shutdown_state *s) 1854 { 1855 if (!s->initialized) { 1856 deviter_init(&s->di, DEVITER_F_SHUTDOWN|DEVITER_F_LEAVES_FIRST); 1857 s->initialized = true; 1858 } 1859 return shutdown_next(s); 1860 } 1861 1862 device_t 1863 shutdown_next(struct shutdown_state *s) 1864 { 1865 device_t dv; 1866 1867 while ((dv = deviter_next(&s->di)) != NULL && !device_is_active(dv)) 1868 ; 1869 1870 if (dv == NULL) 1871 s->initialized = false; 1872 1873 return dv; 1874 } 1875 1876 bool 1877 config_detach_all(int how) 1878 { 1879 static struct shutdown_state s; 1880 device_t curdev; 1881 bool progress = false; 1882 1883 if ((how & RB_NOSYNC) != 0) 1884 return false; 1885 1886 for (curdev = shutdown_first(&s); curdev != NULL; 1887 curdev = shutdown_next(&s)) { 1888 aprint_debug(" detaching %s, ", device_xname(curdev)); 1889 if (config_detach(curdev, DETACH_SHUTDOWN) == 0) { 1890 progress = true; 1891 aprint_debug("success."); 1892 } else 1893 aprint_debug("failed."); 1894 } 1895 return progress; 1896 } 1897 1898 static bool 1899 device_is_ancestor_of(device_t ancestor, device_t descendant) 1900 { 1901 device_t dv; 1902 1903 for (dv = descendant; dv != NULL; dv = device_parent(dv)) { 1904 if (device_parent(dv) == ancestor) 1905 return true; 1906 } 1907 return false; 1908 } 1909 1910 int 1911 config_deactivate(device_t dev) 1912 { 1913 deviter_t di; 1914 const struct cfattach *ca; 1915 device_t descendant; 1916 int s, rv = 0, oflags; 1917 1918 for (descendant = deviter_first(&di, DEVITER_F_ROOT_FIRST); 1919 descendant != NULL; 1920 descendant = deviter_next(&di)) { 1921 if (dev != descendant && 1922 !device_is_ancestor_of(dev, descendant)) 1923 continue; 1924 1925 if ((descendant->dv_flags & DVF_ACTIVE) == 0) 1926 continue; 1927 1928 ca = descendant->dv_cfattach; 1929 oflags = descendant->dv_flags; 1930 1931 descendant->dv_flags &= ~DVF_ACTIVE; 1932 if (ca->ca_activate == NULL) 1933 continue; 1934 s = splhigh(); 1935 rv = (*ca->ca_activate)(descendant, DVACT_DEACTIVATE); 1936 splx(s); 1937 if (rv != 0) 1938 descendant->dv_flags = oflags; 1939 } 1940 deviter_release(&di); 1941 return rv; 1942 } 1943 1944 /* 1945 * Defer the configuration of the specified device until all 1946 * of its parent's devices have been attached. 1947 */ 1948 void 1949 config_defer(device_t dev, void (*func)(device_t)) 1950 { 1951 struct deferred_config *dc; 1952 1953 if (dev->dv_parent == NULL) 1954 panic("config_defer: can't defer config of a root device"); 1955 1956 #ifdef DIAGNOSTIC 1957 TAILQ_FOREACH(dc, &deferred_config_queue, dc_queue) { 1958 if (dc->dc_dev == dev) 1959 panic("config_defer: deferred twice"); 1960 } 1961 #endif 1962 1963 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1964 if (dc == NULL) 1965 panic("config_defer: unable to allocate callback"); 1966 1967 dc->dc_dev = dev; 1968 dc->dc_func = func; 1969 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1970 config_pending_incr(dev); 1971 } 1972 1973 /* 1974 * Defer some autoconfiguration for a device until after interrupts 1975 * are enabled. 1976 */ 1977 void 1978 config_interrupts(device_t dev, void (*func)(device_t)) 1979 { 1980 struct deferred_config *dc; 1981 1982 /* 1983 * If interrupts are enabled, callback now. 1984 */ 1985 if (cold == 0) { 1986 (*func)(dev); 1987 return; 1988 } 1989 1990 #ifdef DIAGNOSTIC 1991 TAILQ_FOREACH(dc, &interrupt_config_queue, dc_queue) { 1992 if (dc->dc_dev == dev) 1993 panic("config_interrupts: deferred twice"); 1994 } 1995 #endif 1996 1997 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1998 if (dc == NULL) 1999 panic("config_interrupts: unable to allocate callback"); 2000 2001 dc->dc_dev = dev; 2002 dc->dc_func = func; 2003 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 2004 config_pending_incr(dev); 2005 } 2006 2007 /* 2008 * Defer some autoconfiguration for a device until after root file system 2009 * is mounted (to load firmware etc). 2010 */ 2011 void 2012 config_mountroot(device_t dev, void (*func)(device_t)) 2013 { 2014 struct deferred_config *dc; 2015 2016 /* 2017 * If root file system is mounted, callback now. 2018 */ 2019 if (root_is_mounted) { 2020 (*func)(dev); 2021 return; 2022 } 2023 2024 #ifdef DIAGNOSTIC 2025 TAILQ_FOREACH(dc, &mountroot_config_queue, dc_queue) { 2026 if (dc->dc_dev == dev) 2027 panic("%s: deferred twice", __func__); 2028 } 2029 #endif 2030 2031 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2032 if (dc == NULL) 2033 panic("%s: unable to allocate callback", __func__); 2034 2035 dc->dc_dev = dev; 2036 dc->dc_func = func; 2037 TAILQ_INSERT_TAIL(&mountroot_config_queue, dc, dc_queue); 2038 } 2039 2040 /* 2041 * Process a deferred configuration queue. 2042 */ 2043 static void 2044 config_process_deferred(struct deferred_config_head *queue, 2045 device_t parent) 2046 { 2047 struct deferred_config *dc, *ndc; 2048 2049 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 2050 ndc = TAILQ_NEXT(dc, dc_queue); 2051 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 2052 TAILQ_REMOVE(queue, dc, dc_queue); 2053 (*dc->dc_func)(dc->dc_dev); 2054 config_pending_decr(dc->dc_dev); 2055 kmem_free(dc, sizeof(*dc)); 2056 } 2057 } 2058 } 2059 2060 /* 2061 * Manipulate the config_pending semaphore. 2062 */ 2063 void 2064 config_pending_incr(device_t dev) 2065 { 2066 2067 mutex_enter(&config_misc_lock); 2068 config_pending++; 2069 #ifdef DEBUG_AUTOCONF 2070 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2071 #endif 2072 mutex_exit(&config_misc_lock); 2073 } 2074 2075 void 2076 config_pending_decr(device_t dev) 2077 { 2078 2079 #ifdef DIAGNOSTIC 2080 if (config_pending == 0) 2081 panic("config_pending_decr: config_pending == 0"); 2082 #endif 2083 mutex_enter(&config_misc_lock); 2084 config_pending--; 2085 #ifdef DEBUG_AUTOCONF 2086 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2087 #endif 2088 if (config_pending == 0) 2089 cv_broadcast(&config_misc_cv); 2090 mutex_exit(&config_misc_lock); 2091 } 2092 2093 /* 2094 * Register a "finalization" routine. Finalization routines are 2095 * called iteratively once all real devices have been found during 2096 * autoconfiguration, for as long as any one finalizer has done 2097 * any work. 2098 */ 2099 int 2100 config_finalize_register(device_t dev, int (*fn)(device_t)) 2101 { 2102 struct finalize_hook *f; 2103 2104 /* 2105 * If finalization has already been done, invoke the 2106 * callback function now. 2107 */ 2108 if (config_finalize_done) { 2109 while ((*fn)(dev) != 0) 2110 /* loop */ ; 2111 return 0; 2112 } 2113 2114 /* Ensure this isn't already on the list. */ 2115 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 2116 if (f->f_func == fn && f->f_dev == dev) 2117 return EEXIST; 2118 } 2119 2120 f = kmem_alloc(sizeof(*f), KM_SLEEP); 2121 f->f_func = fn; 2122 f->f_dev = dev; 2123 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 2124 2125 return 0; 2126 } 2127 2128 void 2129 config_finalize(void) 2130 { 2131 struct finalize_hook *f; 2132 struct pdevinit *pdev; 2133 extern struct pdevinit pdevinit[]; 2134 int errcnt, rv; 2135 2136 /* 2137 * Now that device driver threads have been created, wait for 2138 * them to finish any deferred autoconfiguration. 2139 */ 2140 mutex_enter(&config_misc_lock); 2141 while (config_pending != 0) 2142 cv_wait(&config_misc_cv, &config_misc_lock); 2143 mutex_exit(&config_misc_lock); 2144 2145 KERNEL_LOCK(1, NULL); 2146 2147 /* Attach pseudo-devices. */ 2148 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 2149 (*pdev->pdev_attach)(pdev->pdev_count); 2150 2151 /* Run the hooks until none of them does any work. */ 2152 do { 2153 rv = 0; 2154 TAILQ_FOREACH(f, &config_finalize_list, f_list) 2155 rv |= (*f->f_func)(f->f_dev); 2156 } while (rv != 0); 2157 2158 config_finalize_done = 1; 2159 2160 /* Now free all the hooks. */ 2161 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 2162 TAILQ_REMOVE(&config_finalize_list, f, f_list); 2163 kmem_free(f, sizeof(*f)); 2164 } 2165 2166 KERNEL_UNLOCK_ONE(NULL); 2167 2168 errcnt = aprint_get_error_count(); 2169 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 2170 (boothowto & AB_VERBOSE) == 0) { 2171 mutex_enter(&config_misc_lock); 2172 if (config_do_twiddle) { 2173 config_do_twiddle = 0; 2174 printf_nolog(" done.\n"); 2175 } 2176 mutex_exit(&config_misc_lock); 2177 if (errcnt != 0) { 2178 printf("WARNING: %d error%s while detecting hardware; " 2179 "check system log.\n", errcnt, 2180 errcnt == 1 ? "" : "s"); 2181 } 2182 } 2183 } 2184 2185 void 2186 config_twiddle_init(void) 2187 { 2188 2189 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 2190 config_do_twiddle = 1; 2191 } 2192 callout_setfunc(&config_twiddle_ch, config_twiddle_fn, NULL); 2193 } 2194 2195 void 2196 config_twiddle_fn(void *cookie) 2197 { 2198 2199 mutex_enter(&config_misc_lock); 2200 if (config_do_twiddle) { 2201 twiddle(); 2202 callout_schedule(&config_twiddle_ch, mstohz(100)); 2203 } 2204 mutex_exit(&config_misc_lock); 2205 } 2206 2207 static int 2208 config_alldevs_lock(void) 2209 { 2210 mutex_enter(&alldevs_mtx); 2211 return 0; 2212 } 2213 2214 static void 2215 config_alldevs_enter(struct alldevs_foray *af) 2216 { 2217 TAILQ_INIT(&af->af_garbage); 2218 af->af_s = config_alldevs_lock(); 2219 config_collect_garbage(&af->af_garbage); 2220 } 2221 2222 static void 2223 config_alldevs_exit(struct alldevs_foray *af) 2224 { 2225 config_alldevs_unlock(af->af_s); 2226 config_dump_garbage(&af->af_garbage); 2227 } 2228 2229 /*ARGSUSED*/ 2230 static void 2231 config_alldevs_unlock(int s) 2232 { 2233 mutex_exit(&alldevs_mtx); 2234 } 2235 2236 /* 2237 * device_lookup: 2238 * 2239 * Look up a device instance for a given driver. 2240 */ 2241 device_t 2242 device_lookup(cfdriver_t cd, int unit) 2243 { 2244 device_t dv; 2245 int s; 2246 2247 s = config_alldevs_lock(); 2248 KASSERT(mutex_owned(&alldevs_mtx)); 2249 if (unit < 0 || unit >= cd->cd_ndevs) 2250 dv = NULL; 2251 else if ((dv = cd->cd_devs[unit]) != NULL && dv->dv_del_gen != 0) 2252 dv = NULL; 2253 config_alldevs_unlock(s); 2254 2255 return dv; 2256 } 2257 2258 /* 2259 * device_lookup_private: 2260 * 2261 * Look up a softc instance for a given driver. 2262 */ 2263 void * 2264 device_lookup_private(cfdriver_t cd, int unit) 2265 { 2266 2267 return device_private(device_lookup(cd, unit)); 2268 } 2269 2270 /* 2271 * device_find_by_xname: 2272 * 2273 * Returns the device of the given name or NULL if it doesn't exist. 2274 */ 2275 device_t 2276 device_find_by_xname(const char *name) 2277 { 2278 device_t dv; 2279 deviter_t di; 2280 2281 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 2282 if (strcmp(device_xname(dv), name) == 0) 2283 break; 2284 } 2285 deviter_release(&di); 2286 2287 return dv; 2288 } 2289 2290 /* 2291 * device_find_by_driver_unit: 2292 * 2293 * Returns the device of the given driver name and unit or 2294 * NULL if it doesn't exist. 2295 */ 2296 device_t 2297 device_find_by_driver_unit(const char *name, int unit) 2298 { 2299 struct cfdriver *cd; 2300 2301 if ((cd = config_cfdriver_lookup(name)) == NULL) 2302 return NULL; 2303 return device_lookup(cd, unit); 2304 } 2305 2306 /* 2307 * Power management related functions. 2308 */ 2309 2310 bool 2311 device_pmf_is_registered(device_t dev) 2312 { 2313 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 2314 } 2315 2316 bool 2317 device_pmf_driver_suspend(device_t dev, const pmf_qual_t *qual) 2318 { 2319 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2320 return true; 2321 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2322 return false; 2323 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2324 dev->dv_driver_suspend != NULL && 2325 !(*dev->dv_driver_suspend)(dev, qual)) 2326 return false; 2327 2328 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 2329 return true; 2330 } 2331 2332 bool 2333 device_pmf_driver_resume(device_t dev, const pmf_qual_t *qual) 2334 { 2335 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2336 return true; 2337 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2338 return false; 2339 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2340 dev->dv_driver_resume != NULL && 2341 !(*dev->dv_driver_resume)(dev, qual)) 2342 return false; 2343 2344 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2345 return true; 2346 } 2347 2348 bool 2349 device_pmf_driver_shutdown(device_t dev, int how) 2350 { 2351 2352 if (*dev->dv_driver_shutdown != NULL && 2353 !(*dev->dv_driver_shutdown)(dev, how)) 2354 return false; 2355 return true; 2356 } 2357 2358 bool 2359 device_pmf_driver_register(device_t dev, 2360 bool (*suspend)(device_t, const pmf_qual_t *), 2361 bool (*resume)(device_t, const pmf_qual_t *), 2362 bool (*shutdown)(device_t, int)) 2363 { 2364 dev->dv_driver_suspend = suspend; 2365 dev->dv_driver_resume = resume; 2366 dev->dv_driver_shutdown = shutdown; 2367 dev->dv_flags |= DVF_POWER_HANDLERS; 2368 return true; 2369 } 2370 2371 static const char * 2372 curlwp_name(void) 2373 { 2374 if (curlwp->l_name != NULL) 2375 return curlwp->l_name; 2376 else 2377 return curlwp->l_proc->p_comm; 2378 } 2379 2380 void 2381 device_pmf_driver_deregister(device_t dev) 2382 { 2383 device_lock_t dvl = device_getlock(dev); 2384 2385 dev->dv_driver_suspend = NULL; 2386 dev->dv_driver_resume = NULL; 2387 2388 mutex_enter(&dvl->dvl_mtx); 2389 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2390 while (dvl->dvl_nlock > 0 || dvl->dvl_nwait > 0) { 2391 /* Wake a thread that waits for the lock. That 2392 * thread will fail to acquire the lock, and then 2393 * it will wake the next thread that waits for the 2394 * lock, or else it will wake us. 2395 */ 2396 cv_signal(&dvl->dvl_cv); 2397 pmflock_debug(dev, __func__, __LINE__); 2398 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2399 pmflock_debug(dev, __func__, __LINE__); 2400 } 2401 mutex_exit(&dvl->dvl_mtx); 2402 } 2403 2404 bool 2405 device_pmf_driver_child_register(device_t dev) 2406 { 2407 device_t parent = device_parent(dev); 2408 2409 if (parent == NULL || parent->dv_driver_child_register == NULL) 2410 return true; 2411 return (*parent->dv_driver_child_register)(dev); 2412 } 2413 2414 void 2415 device_pmf_driver_set_child_register(device_t dev, 2416 bool (*child_register)(device_t)) 2417 { 2418 dev->dv_driver_child_register = child_register; 2419 } 2420 2421 static void 2422 pmflock_debug(device_t dev, const char *func, int line) 2423 { 2424 device_lock_t dvl = device_getlock(dev); 2425 2426 aprint_debug_dev(dev, "%s.%d, %s dvl_nlock %d dvl_nwait %d dv_flags %x\n", 2427 func, line, curlwp_name(), dvl->dvl_nlock, dvl->dvl_nwait, 2428 dev->dv_flags); 2429 } 2430 2431 static bool 2432 device_pmf_lock1(device_t dev) 2433 { 2434 device_lock_t dvl = device_getlock(dev); 2435 2436 while (device_pmf_is_registered(dev) && 2437 dvl->dvl_nlock > 0 && dvl->dvl_holder != curlwp) { 2438 dvl->dvl_nwait++; 2439 pmflock_debug(dev, __func__, __LINE__); 2440 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2441 pmflock_debug(dev, __func__, __LINE__); 2442 dvl->dvl_nwait--; 2443 } 2444 if (!device_pmf_is_registered(dev)) { 2445 pmflock_debug(dev, __func__, __LINE__); 2446 /* We could not acquire the lock, but some other thread may 2447 * wait for it, also. Wake that thread. 2448 */ 2449 cv_signal(&dvl->dvl_cv); 2450 return false; 2451 } 2452 dvl->dvl_nlock++; 2453 dvl->dvl_holder = curlwp; 2454 pmflock_debug(dev, __func__, __LINE__); 2455 return true; 2456 } 2457 2458 bool 2459 device_pmf_lock(device_t dev) 2460 { 2461 bool rc; 2462 device_lock_t dvl = device_getlock(dev); 2463 2464 mutex_enter(&dvl->dvl_mtx); 2465 rc = device_pmf_lock1(dev); 2466 mutex_exit(&dvl->dvl_mtx); 2467 2468 return rc; 2469 } 2470 2471 void 2472 device_pmf_unlock(device_t dev) 2473 { 2474 device_lock_t dvl = device_getlock(dev); 2475 2476 KASSERT(dvl->dvl_nlock > 0); 2477 mutex_enter(&dvl->dvl_mtx); 2478 if (--dvl->dvl_nlock == 0) 2479 dvl->dvl_holder = NULL; 2480 cv_signal(&dvl->dvl_cv); 2481 pmflock_debug(dev, __func__, __LINE__); 2482 mutex_exit(&dvl->dvl_mtx); 2483 } 2484 2485 device_lock_t 2486 device_getlock(device_t dev) 2487 { 2488 return &dev->dv_lock; 2489 } 2490 2491 void * 2492 device_pmf_bus_private(device_t dev) 2493 { 2494 return dev->dv_bus_private; 2495 } 2496 2497 bool 2498 device_pmf_bus_suspend(device_t dev, const pmf_qual_t *qual) 2499 { 2500 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2501 return true; 2502 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2503 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2504 return false; 2505 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2506 dev->dv_bus_suspend != NULL && 2507 !(*dev->dv_bus_suspend)(dev, qual)) 2508 return false; 2509 2510 dev->dv_flags |= DVF_BUS_SUSPENDED; 2511 return true; 2512 } 2513 2514 bool 2515 device_pmf_bus_resume(device_t dev, const pmf_qual_t *qual) 2516 { 2517 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2518 return true; 2519 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2520 dev->dv_bus_resume != NULL && 2521 !(*dev->dv_bus_resume)(dev, qual)) 2522 return false; 2523 2524 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2525 return true; 2526 } 2527 2528 bool 2529 device_pmf_bus_shutdown(device_t dev, int how) 2530 { 2531 2532 if (*dev->dv_bus_shutdown != NULL && 2533 !(*dev->dv_bus_shutdown)(dev, how)) 2534 return false; 2535 return true; 2536 } 2537 2538 void 2539 device_pmf_bus_register(device_t dev, void *priv, 2540 bool (*suspend)(device_t, const pmf_qual_t *), 2541 bool (*resume)(device_t, const pmf_qual_t *), 2542 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2543 { 2544 dev->dv_bus_private = priv; 2545 dev->dv_bus_resume = resume; 2546 dev->dv_bus_suspend = suspend; 2547 dev->dv_bus_shutdown = shutdown; 2548 dev->dv_bus_deregister = deregister; 2549 } 2550 2551 void 2552 device_pmf_bus_deregister(device_t dev) 2553 { 2554 if (dev->dv_bus_deregister == NULL) 2555 return; 2556 (*dev->dv_bus_deregister)(dev); 2557 dev->dv_bus_private = NULL; 2558 dev->dv_bus_suspend = NULL; 2559 dev->dv_bus_resume = NULL; 2560 dev->dv_bus_deregister = NULL; 2561 } 2562 2563 void * 2564 device_pmf_class_private(device_t dev) 2565 { 2566 return dev->dv_class_private; 2567 } 2568 2569 bool 2570 device_pmf_class_suspend(device_t dev, const pmf_qual_t *qual) 2571 { 2572 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2573 return true; 2574 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2575 dev->dv_class_suspend != NULL && 2576 !(*dev->dv_class_suspend)(dev, qual)) 2577 return false; 2578 2579 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2580 return true; 2581 } 2582 2583 bool 2584 device_pmf_class_resume(device_t dev, const pmf_qual_t *qual) 2585 { 2586 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2587 return true; 2588 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2589 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2590 return false; 2591 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2592 dev->dv_class_resume != NULL && 2593 !(*dev->dv_class_resume)(dev, qual)) 2594 return false; 2595 2596 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2597 return true; 2598 } 2599 2600 void 2601 device_pmf_class_register(device_t dev, void *priv, 2602 bool (*suspend)(device_t, const pmf_qual_t *), 2603 bool (*resume)(device_t, const pmf_qual_t *), 2604 void (*deregister)(device_t)) 2605 { 2606 dev->dv_class_private = priv; 2607 dev->dv_class_suspend = suspend; 2608 dev->dv_class_resume = resume; 2609 dev->dv_class_deregister = deregister; 2610 } 2611 2612 void 2613 device_pmf_class_deregister(device_t dev) 2614 { 2615 if (dev->dv_class_deregister == NULL) 2616 return; 2617 (*dev->dv_class_deregister)(dev); 2618 dev->dv_class_private = NULL; 2619 dev->dv_class_suspend = NULL; 2620 dev->dv_class_resume = NULL; 2621 dev->dv_class_deregister = NULL; 2622 } 2623 2624 bool 2625 device_active(device_t dev, devactive_t type) 2626 { 2627 size_t i; 2628 2629 if (dev->dv_activity_count == 0) 2630 return false; 2631 2632 for (i = 0; i < dev->dv_activity_count; ++i) { 2633 if (dev->dv_activity_handlers[i] == NULL) 2634 break; 2635 (*dev->dv_activity_handlers[i])(dev, type); 2636 } 2637 2638 return true; 2639 } 2640 2641 bool 2642 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2643 { 2644 void (**new_handlers)(device_t, devactive_t); 2645 void (**old_handlers)(device_t, devactive_t); 2646 size_t i, old_size, new_size; 2647 int s; 2648 2649 old_handlers = dev->dv_activity_handlers; 2650 old_size = dev->dv_activity_count; 2651 2652 for (i = 0; i < old_size; ++i) { 2653 KASSERT(old_handlers[i] != handler); 2654 if (old_handlers[i] == NULL) { 2655 old_handlers[i] = handler; 2656 return true; 2657 } 2658 } 2659 2660 new_size = old_size + 4; 2661 new_handlers = kmem_alloc(sizeof(void *[new_size]), KM_SLEEP); 2662 2663 memcpy(new_handlers, old_handlers, sizeof(void *[old_size])); 2664 new_handlers[old_size] = handler; 2665 memset(new_handlers + old_size + 1, 0, 2666 sizeof(int [new_size - (old_size+1)])); 2667 2668 s = splhigh(); 2669 dev->dv_activity_count = new_size; 2670 dev->dv_activity_handlers = new_handlers; 2671 splx(s); 2672 2673 if (old_handlers != NULL) 2674 kmem_free(old_handlers, sizeof(void * [old_size])); 2675 2676 return true; 2677 } 2678 2679 void 2680 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2681 { 2682 void (**old_handlers)(device_t, devactive_t); 2683 size_t i, old_size; 2684 int s; 2685 2686 old_handlers = dev->dv_activity_handlers; 2687 old_size = dev->dv_activity_count; 2688 2689 for (i = 0; i < old_size; ++i) { 2690 if (old_handlers[i] == handler) 2691 break; 2692 if (old_handlers[i] == NULL) 2693 return; /* XXX panic? */ 2694 } 2695 2696 if (i == old_size) 2697 return; /* XXX panic? */ 2698 2699 for (; i < old_size - 1; ++i) { 2700 if ((old_handlers[i] = old_handlers[i + 1]) != NULL) 2701 continue; 2702 2703 if (i == 0) { 2704 s = splhigh(); 2705 dev->dv_activity_count = 0; 2706 dev->dv_activity_handlers = NULL; 2707 splx(s); 2708 kmem_free(old_handlers, sizeof(void *[old_size])); 2709 } 2710 return; 2711 } 2712 old_handlers[i] = NULL; 2713 } 2714 2715 /* Return true iff the device_t `dev' exists at generation `gen'. */ 2716 static bool 2717 device_exists_at(device_t dv, devgen_t gen) 2718 { 2719 return (dv->dv_del_gen == 0 || dv->dv_del_gen > gen) && 2720 dv->dv_add_gen <= gen; 2721 } 2722 2723 static bool 2724 deviter_visits(const deviter_t *di, device_t dv) 2725 { 2726 return device_exists_at(dv, di->di_gen); 2727 } 2728 2729 /* 2730 * Device Iteration 2731 * 2732 * deviter_t: a device iterator. Holds state for a "walk" visiting 2733 * each device_t's in the device tree. 2734 * 2735 * deviter_init(di, flags): initialize the device iterator `di' 2736 * to "walk" the device tree. deviter_next(di) will return 2737 * the first device_t in the device tree, or NULL if there are 2738 * no devices. 2739 * 2740 * `flags' is one or more of DEVITER_F_RW, indicating that the 2741 * caller intends to modify the device tree by calling 2742 * config_detach(9) on devices in the order that the iterator 2743 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2744 * nearest the "root" of the device tree to be returned, first; 2745 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2746 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2747 * indicating both that deviter_init() should not respect any 2748 * locks on the device tree, and that deviter_next(di) may run 2749 * in more than one LWP before the walk has finished. 2750 * 2751 * Only one DEVITER_F_RW iterator may be in the device tree at 2752 * once. 2753 * 2754 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2755 * 2756 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2757 * DEVITER_F_LEAVES_FIRST are used in combination. 2758 * 2759 * deviter_first(di, flags): initialize the device iterator `di' 2760 * and return the first device_t in the device tree, or NULL 2761 * if there are no devices. The statement 2762 * 2763 * dv = deviter_first(di); 2764 * 2765 * is shorthand for 2766 * 2767 * deviter_init(di); 2768 * dv = deviter_next(di); 2769 * 2770 * deviter_next(di): return the next device_t in the device tree, 2771 * or NULL if there are no more devices. deviter_next(di) 2772 * is undefined if `di' was not initialized with deviter_init() or 2773 * deviter_first(). 2774 * 2775 * deviter_release(di): stops iteration (subsequent calls to 2776 * deviter_next() will return NULL), releases any locks and 2777 * resources held by the device iterator. 2778 * 2779 * Device iteration does not return device_t's in any particular 2780 * order. An iterator will never return the same device_t twice. 2781 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2782 * is called repeatedly on the same `di', it will eventually return 2783 * NULL. It is ok to attach/detach devices during device iteration. 2784 */ 2785 void 2786 deviter_init(deviter_t *di, deviter_flags_t flags) 2787 { 2788 device_t dv; 2789 int s; 2790 2791 memset(di, 0, sizeof(*di)); 2792 2793 s = config_alldevs_lock(); 2794 if ((flags & DEVITER_F_SHUTDOWN) != 0) 2795 flags |= DEVITER_F_RW; 2796 2797 if ((flags & DEVITER_F_RW) != 0) 2798 alldevs_nwrite++; 2799 else 2800 alldevs_nread++; 2801 di->di_gen = alldevs_gen++; 2802 config_alldevs_unlock(s); 2803 2804 di->di_flags = flags; 2805 2806 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2807 case DEVITER_F_LEAVES_FIRST: 2808 TAILQ_FOREACH(dv, &alldevs, dv_list) { 2809 if (!deviter_visits(di, dv)) 2810 continue; 2811 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2812 } 2813 break; 2814 case DEVITER_F_ROOT_FIRST: 2815 TAILQ_FOREACH(dv, &alldevs, dv_list) { 2816 if (!deviter_visits(di, dv)) 2817 continue; 2818 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2819 } 2820 break; 2821 default: 2822 break; 2823 } 2824 2825 deviter_reinit(di); 2826 } 2827 2828 static void 2829 deviter_reinit(deviter_t *di) 2830 { 2831 if ((di->di_flags & DEVITER_F_RW) != 0) 2832 di->di_prev = TAILQ_LAST(&alldevs, devicelist); 2833 else 2834 di->di_prev = TAILQ_FIRST(&alldevs); 2835 } 2836 2837 device_t 2838 deviter_first(deviter_t *di, deviter_flags_t flags) 2839 { 2840 deviter_init(di, flags); 2841 return deviter_next(di); 2842 } 2843 2844 static device_t 2845 deviter_next2(deviter_t *di) 2846 { 2847 device_t dv; 2848 2849 dv = di->di_prev; 2850 2851 if (dv == NULL) 2852 return NULL; 2853 2854 if ((di->di_flags & DEVITER_F_RW) != 0) 2855 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2856 else 2857 di->di_prev = TAILQ_NEXT(dv, dv_list); 2858 2859 return dv; 2860 } 2861 2862 static device_t 2863 deviter_next1(deviter_t *di) 2864 { 2865 device_t dv; 2866 2867 do { 2868 dv = deviter_next2(di); 2869 } while (dv != NULL && !deviter_visits(di, dv)); 2870 2871 return dv; 2872 } 2873 2874 device_t 2875 deviter_next(deviter_t *di) 2876 { 2877 device_t dv = NULL; 2878 2879 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2880 case 0: 2881 return deviter_next1(di); 2882 case DEVITER_F_LEAVES_FIRST: 2883 while (di->di_curdepth >= 0) { 2884 if ((dv = deviter_next1(di)) == NULL) { 2885 di->di_curdepth--; 2886 deviter_reinit(di); 2887 } else if (dv->dv_depth == di->di_curdepth) 2888 break; 2889 } 2890 return dv; 2891 case DEVITER_F_ROOT_FIRST: 2892 while (di->di_curdepth <= di->di_maxdepth) { 2893 if ((dv = deviter_next1(di)) == NULL) { 2894 di->di_curdepth++; 2895 deviter_reinit(di); 2896 } else if (dv->dv_depth == di->di_curdepth) 2897 break; 2898 } 2899 return dv; 2900 default: 2901 return NULL; 2902 } 2903 } 2904 2905 void 2906 deviter_release(deviter_t *di) 2907 { 2908 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 2909 int s; 2910 2911 s = config_alldevs_lock(); 2912 if (rw) 2913 --alldevs_nwrite; 2914 else 2915 --alldevs_nread; 2916 /* XXX wake a garbage-collection thread */ 2917 config_alldevs_unlock(s); 2918 } 2919 2920 const char * 2921 cfdata_ifattr(const struct cfdata *cf) 2922 { 2923 return cf->cf_pspec->cfp_iattr; 2924 } 2925 2926 bool 2927 ifattr_match(const char *snull, const char *t) 2928 { 2929 return (snull == NULL) || strcmp(snull, t) == 0; 2930 } 2931 2932 void 2933 null_childdetached(device_t self, device_t child) 2934 { 2935 /* do nothing */ 2936 } 2937 2938 static void 2939 sysctl_detach_setup(struct sysctllog **clog) 2940 { 2941 2942 sysctl_createv(clog, 0, NULL, NULL, 2943 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 2944 CTLTYPE_BOOL, "detachall", 2945 SYSCTL_DESCR("Detach all devices at shutdown"), 2946 NULL, 0, &detachall, 0, 2947 CTL_KERN, CTL_CREATE, CTL_EOL); 2948 } 2949
Indexes created Fri Sep 26 08:10:20 GMT 2025