subr_autoconf.c revision 1.274
1 /* $NetBSD: subr_autoconf.c,v 1.274 2020/10/03 22:32:50 riastradh 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 1.274 2020/10/03 22:32:50 riastradh 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 static 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 static struct deferred_config_head deferred_config_queue = 196 TAILQ_HEAD_INITIALIZER(deferred_config_queue); 197 static struct deferred_config_head interrupt_config_queue = 198 TAILQ_HEAD_INITIALIZER(interrupt_config_queue); 199 static int interrupt_config_threads = 8; 200 static struct deferred_config_head mountroot_config_queue = 201 TAILQ_HEAD_INITIALIZER(mountroot_config_queue); 202 static int mountroot_config_threads = 2; 203 static lwp_t **mountroot_config_lwpids; 204 static size_t mountroot_config_lwpids_size; 205 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 devicelist alldevs = TAILQ_HEAD_INITIALIZER(alldevs); 221 static kmutex_t alldevs_lock __cacheline_aligned; 222 static devgen_t alldevs_gen = 1; 223 static int alldevs_nread = 0; 224 static int alldevs_nwrite = 0; 225 static bool alldevs_garbage = false; 226 227 static struct devicelist config_pending = 228 TAILQ_HEAD_INITIALIZER(config_pending); 229 static kmutex_t config_misc_lock; 230 static kcondvar_t config_misc_cv; 231 232 static bool detachall = false; 233 234 #define STREQ(s1, s2) \ 235 (*(s1) == *(s2) && strcmp((s1), (s2)) == 0) 236 237 static bool config_initialized = false; /* config_init() has been called. */ 238 239 static int config_do_twiddle; 240 static callout_t config_twiddle_ch; 241 242 static void sysctl_detach_setup(struct sysctllog **); 243 244 int no_devmon_insert(const char *, prop_dictionary_t); 245 int (*devmon_insert_vec)(const char *, prop_dictionary_t) = no_devmon_insert; 246 247 typedef int (*cfdriver_fn)(struct cfdriver *); 248 static int 249 frob_cfdrivervec(struct cfdriver * const *cfdriverv, 250 cfdriver_fn drv_do, cfdriver_fn drv_undo, 251 const char *style, bool dopanic) 252 { 253 void (*pr)(const char *, ...) __printflike(1, 2) = 254 dopanic ? panic : printf; 255 int i, error = 0, e2 __diagused; 256 257 for (i = 0; cfdriverv[i] != NULL; i++) { 258 if ((error = drv_do(cfdriverv[i])) != 0) { 259 pr("configure: `%s' driver %s failed: %d", 260 cfdriverv[i]->cd_name, style, error); 261 goto bad; 262 } 263 } 264 265 KASSERT(error == 0); 266 return 0; 267 268 bad: 269 printf("\n"); 270 for (i--; i >= 0; i--) { 271 e2 = drv_undo(cfdriverv[i]); 272 KASSERT(e2 == 0); 273 } 274 275 return error; 276 } 277 278 typedef int (*cfattach_fn)(const char *, struct cfattach *); 279 static int 280 frob_cfattachvec(const struct cfattachinit *cfattachv, 281 cfattach_fn att_do, cfattach_fn att_undo, 282 const char *style, bool dopanic) 283 { 284 const struct cfattachinit *cfai = NULL; 285 void (*pr)(const char *, ...) __printflike(1, 2) = 286 dopanic ? panic : printf; 287 int j = 0, error = 0, e2 __diagused; 288 289 for (cfai = &cfattachv[0]; cfai->cfai_name != NULL; cfai++) { 290 for (j = 0; cfai->cfai_list[j] != NULL; j++) { 291 if ((error = att_do(cfai->cfai_name, 292 cfai->cfai_list[j])) != 0) { 293 pr("configure: attachment `%s' " 294 "of `%s' driver %s failed: %d", 295 cfai->cfai_list[j]->ca_name, 296 cfai->cfai_name, style, error); 297 goto bad; 298 } 299 } 300 } 301 302 KASSERT(error == 0); 303 return 0; 304 305 bad: 306 /* 307 * Rollback in reverse order. dunno if super-important, but 308 * do that anyway. Although the code looks a little like 309 * someone did a little integration (in the math sense). 310 */ 311 printf("\n"); 312 if (cfai) { 313 bool last; 314 315 for (last = false; last == false; ) { 316 if (cfai == &cfattachv[0]) 317 last = true; 318 for (j--; j >= 0; j--) { 319 e2 = att_undo(cfai->cfai_name, 320 cfai->cfai_list[j]); 321 KASSERT(e2 == 0); 322 } 323 if (!last) { 324 cfai--; 325 for (j = 0; cfai->cfai_list[j] != NULL; j++) 326 ; 327 } 328 } 329 } 330 331 return error; 332 } 333 334 /* 335 * Initialize the autoconfiguration data structures. Normally this 336 * is done by configure(), but some platforms need to do this very 337 * early (to e.g. initialize the console). 338 */ 339 void 340 config_init(void) 341 { 342 343 KASSERT(config_initialized == false); 344 345 mutex_init(&alldevs_lock, MUTEX_DEFAULT, IPL_VM); 346 347 mutex_init(&config_misc_lock, MUTEX_DEFAULT, IPL_NONE); 348 cv_init(&config_misc_cv, "cfgmisc"); 349 350 callout_init(&config_twiddle_ch, CALLOUT_MPSAFE); 351 352 frob_cfdrivervec(cfdriver_list_initial, 353 config_cfdriver_attach, NULL, "bootstrap", true); 354 frob_cfattachvec(cfattachinit, 355 config_cfattach_attach, NULL, "bootstrap", true); 356 357 initcftable.ct_cfdata = cfdata; 358 TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list); 359 360 rnd_attach_source(&rnd_autoconf_source, "autoconf", RND_TYPE_UNKNOWN, 361 RND_FLAG_COLLECT_TIME); 362 363 config_initialized = true; 364 } 365 366 /* 367 * Init or fini drivers and attachments. Either all or none 368 * are processed (via rollback). It would be nice if this were 369 * atomic to outside consumers, but with the current state of 370 * locking ... 371 */ 372 int 373 config_init_component(struct cfdriver * const *cfdriverv, 374 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 375 { 376 int error; 377 378 if ((error = frob_cfdrivervec(cfdriverv, 379 config_cfdriver_attach, config_cfdriver_detach, "init", false))!= 0) 380 return error; 381 if ((error = frob_cfattachvec(cfattachv, 382 config_cfattach_attach, config_cfattach_detach, 383 "init", false)) != 0) { 384 frob_cfdrivervec(cfdriverv, 385 config_cfdriver_detach, NULL, "init rollback", true); 386 return error; 387 } 388 if ((error = config_cfdata_attach(cfdatav, 1)) != 0) { 389 frob_cfattachvec(cfattachv, 390 config_cfattach_detach, NULL, "init rollback", true); 391 frob_cfdrivervec(cfdriverv, 392 config_cfdriver_detach, NULL, "init rollback", true); 393 return error; 394 } 395 396 return 0; 397 } 398 399 int 400 config_fini_component(struct cfdriver * const *cfdriverv, 401 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 402 { 403 int error; 404 405 if ((error = config_cfdata_detach(cfdatav)) != 0) 406 return error; 407 if ((error = frob_cfattachvec(cfattachv, 408 config_cfattach_detach, config_cfattach_attach, 409 "fini", false)) != 0) { 410 if (config_cfdata_attach(cfdatav, 0) != 0) 411 panic("config_cfdata fini rollback failed"); 412 return error; 413 } 414 if ((error = frob_cfdrivervec(cfdriverv, 415 config_cfdriver_detach, config_cfdriver_attach, 416 "fini", false)) != 0) { 417 frob_cfattachvec(cfattachv, 418 config_cfattach_attach, NULL, "fini rollback", true); 419 if (config_cfdata_attach(cfdatav, 0) != 0) 420 panic("config_cfdata fini rollback failed"); 421 return error; 422 } 423 424 return 0; 425 } 426 427 void 428 config_init_mi(void) 429 { 430 431 if (!config_initialized) 432 config_init(); 433 434 sysctl_detach_setup(NULL); 435 } 436 437 void 438 config_deferred(device_t dev) 439 { 440 config_process_deferred(&deferred_config_queue, dev); 441 config_process_deferred(&interrupt_config_queue, dev); 442 config_process_deferred(&mountroot_config_queue, dev); 443 } 444 445 static void 446 config_interrupts_thread(void *cookie) 447 { 448 struct deferred_config *dc; 449 device_t dev; 450 451 mutex_enter(&config_misc_lock); 452 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 453 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 454 mutex_exit(&config_misc_lock); 455 456 dev = dc->dc_dev; 457 (*dc->dc_func)(dev); 458 if (!device_pmf_is_registered(dev)) 459 aprint_debug_dev(dev, 460 "WARNING: power management not supported\n"); 461 config_pending_decr(dev); 462 kmem_free(dc, sizeof(*dc)); 463 464 mutex_enter(&config_misc_lock); 465 dev->dv_flags &= ~DVF_ATTACH_INPROGRESS; 466 } 467 mutex_exit(&config_misc_lock); 468 469 kthread_exit(0); 470 } 471 472 void 473 config_create_interruptthreads(void) 474 { 475 int i; 476 477 for (i = 0; i < interrupt_config_threads; i++) { 478 (void)kthread_create(PRI_NONE, 0/*XXXSMP */, NULL, 479 config_interrupts_thread, NULL, NULL, "configintr"); 480 } 481 } 482 483 static void 484 config_mountroot_thread(void *cookie) 485 { 486 struct deferred_config *dc; 487 488 mutex_enter(&config_misc_lock); 489 while ((dc = TAILQ_FIRST(&mountroot_config_queue)) != NULL) { 490 TAILQ_REMOVE(&mountroot_config_queue, dc, dc_queue); 491 mutex_exit(&config_misc_lock); 492 493 (*dc->dc_func)(dc->dc_dev); 494 kmem_free(dc, sizeof(*dc)); 495 496 mutex_enter(&config_misc_lock); 497 } 498 mutex_exit(&config_misc_lock); 499 500 kthread_exit(0); 501 } 502 503 void 504 config_create_mountrootthreads(void) 505 { 506 int i; 507 508 if (!root_is_mounted) 509 root_is_mounted = true; 510 511 mountroot_config_lwpids_size = sizeof(mountroot_config_lwpids) * 512 mountroot_config_threads; 513 mountroot_config_lwpids = kmem_alloc(mountroot_config_lwpids_size, 514 KM_NOSLEEP); 515 KASSERT(mountroot_config_lwpids); 516 for (i = 0; i < mountroot_config_threads; i++) { 517 mountroot_config_lwpids[i] = 0; 518 (void)kthread_create(PRI_NONE, KTHREAD_MUSTJOIN/* XXXSMP */, 519 NULL, config_mountroot_thread, NULL, 520 &mountroot_config_lwpids[i], 521 "configroot"); 522 } 523 } 524 525 void 526 config_finalize_mountroot(void) 527 { 528 int i, error; 529 530 for (i = 0; i < mountroot_config_threads; i++) { 531 if (mountroot_config_lwpids[i] == 0) 532 continue; 533 534 error = kthread_join(mountroot_config_lwpids[i]); 535 if (error) 536 printf("%s: thread %x joined with error %d\n", 537 __func__, i, error); 538 } 539 kmem_free(mountroot_config_lwpids, mountroot_config_lwpids_size); 540 } 541 542 /* 543 * Announce device attach/detach to userland listeners. 544 */ 545 546 int 547 no_devmon_insert(const char *name, prop_dictionary_t p) 548 { 549 550 return ENODEV; 551 } 552 553 static void 554 devmon_report_device(device_t dev, bool isattach) 555 { 556 prop_dictionary_t ev, dict = device_properties(dev); 557 const char *parent; 558 const char *what; 559 const char *where; 560 device_t pdev = device_parent(dev); 561 562 /* If currently no drvctl device, just return */ 563 if (devmon_insert_vec == no_devmon_insert) 564 return; 565 566 ev = prop_dictionary_create(); 567 if (ev == NULL) 568 return; 569 570 what = (isattach ? "device-attach" : "device-detach"); 571 parent = (pdev == NULL ? "root" : device_xname(pdev)); 572 if (prop_dictionary_get_string(dict, "location", &where)) { 573 prop_dictionary_set_string(ev, "location", where); 574 aprint_debug("ev: %s %s at %s in [%s]\n", 575 what, device_xname(dev), parent, where); 576 } 577 if (!prop_dictionary_set_string(ev, "device", device_xname(dev)) || 578 !prop_dictionary_set_string(ev, "parent", parent)) { 579 prop_object_release(ev); 580 return; 581 } 582 583 if ((*devmon_insert_vec)(what, ev) != 0) 584 prop_object_release(ev); 585 } 586 587 /* 588 * Add a cfdriver to the system. 589 */ 590 int 591 config_cfdriver_attach(struct cfdriver *cd) 592 { 593 struct cfdriver *lcd; 594 595 /* Make sure this driver isn't already in the system. */ 596 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 597 if (STREQ(lcd->cd_name, cd->cd_name)) 598 return EEXIST; 599 } 600 601 LIST_INIT(&cd->cd_attach); 602 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 603 604 return 0; 605 } 606 607 /* 608 * Remove a cfdriver from the system. 609 */ 610 int 611 config_cfdriver_detach(struct cfdriver *cd) 612 { 613 struct alldevs_foray af; 614 int i, rc = 0; 615 616 config_alldevs_enter(&af); 617 /* Make sure there are no active instances. */ 618 for (i = 0; i < cd->cd_ndevs; i++) { 619 if (cd->cd_devs[i] != NULL) { 620 rc = EBUSY; 621 break; 622 } 623 } 624 config_alldevs_exit(&af); 625 626 if (rc != 0) 627 return rc; 628 629 /* ...and no attachments loaded. */ 630 if (LIST_EMPTY(&cd->cd_attach) == 0) 631 return EBUSY; 632 633 LIST_REMOVE(cd, cd_list); 634 635 KASSERT(cd->cd_devs == NULL); 636 637 return 0; 638 } 639 640 /* 641 * Look up a cfdriver by name. 642 */ 643 struct cfdriver * 644 config_cfdriver_lookup(const char *name) 645 { 646 struct cfdriver *cd; 647 648 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 649 if (STREQ(cd->cd_name, name)) 650 return cd; 651 } 652 653 return NULL; 654 } 655 656 /* 657 * Add a cfattach to the specified driver. 658 */ 659 int 660 config_cfattach_attach(const char *driver, struct cfattach *ca) 661 { 662 struct cfattach *lca; 663 struct cfdriver *cd; 664 665 cd = config_cfdriver_lookup(driver); 666 if (cd == NULL) 667 return ESRCH; 668 669 /* Make sure this attachment isn't already on this driver. */ 670 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 671 if (STREQ(lca->ca_name, ca->ca_name)) 672 return EEXIST; 673 } 674 675 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 676 677 return 0; 678 } 679 680 /* 681 * Remove a cfattach from the specified driver. 682 */ 683 int 684 config_cfattach_detach(const char *driver, struct cfattach *ca) 685 { 686 struct alldevs_foray af; 687 struct cfdriver *cd; 688 device_t dev; 689 int i, rc = 0; 690 691 cd = config_cfdriver_lookup(driver); 692 if (cd == NULL) 693 return ESRCH; 694 695 config_alldevs_enter(&af); 696 /* Make sure there are no active instances. */ 697 for (i = 0; i < cd->cd_ndevs; i++) { 698 if ((dev = cd->cd_devs[i]) == NULL) 699 continue; 700 if (dev->dv_cfattach == ca) { 701 rc = EBUSY; 702 break; 703 } 704 } 705 config_alldevs_exit(&af); 706 707 if (rc != 0) 708 return rc; 709 710 LIST_REMOVE(ca, ca_list); 711 712 return 0; 713 } 714 715 /* 716 * Look up a cfattach by name. 717 */ 718 static struct cfattach * 719 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 720 { 721 struct cfattach *ca; 722 723 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 724 if (STREQ(ca->ca_name, atname)) 725 return ca; 726 } 727 728 return NULL; 729 } 730 731 /* 732 * Look up a cfattach by driver/attachment name. 733 */ 734 struct cfattach * 735 config_cfattach_lookup(const char *name, const char *atname) 736 { 737 struct cfdriver *cd; 738 739 cd = config_cfdriver_lookup(name); 740 if (cd == NULL) 741 return NULL; 742 743 return config_cfattach_lookup_cd(cd, atname); 744 } 745 746 /* 747 * Apply the matching function and choose the best. This is used 748 * a few times and we want to keep the code small. 749 */ 750 static void 751 mapply(struct matchinfo *m, cfdata_t cf) 752 { 753 int pri; 754 755 if (m->fn != NULL) { 756 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 757 } else { 758 pri = config_match(m->parent, cf, m->aux); 759 } 760 if (pri > m->pri) { 761 m->match = cf; 762 m->pri = pri; 763 } 764 } 765 766 int 767 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 768 { 769 const struct cfiattrdata *ci; 770 const struct cflocdesc *cl; 771 int nlocs, i; 772 773 ci = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 774 KASSERT(ci); 775 nlocs = ci->ci_loclen; 776 KASSERT(!nlocs || locs); 777 for (i = 0; i < nlocs; i++) { 778 cl = &ci->ci_locdesc[i]; 779 if (cl->cld_defaultstr != NULL && 780 cf->cf_loc[i] == cl->cld_default) 781 continue; 782 if (cf->cf_loc[i] == locs[i]) 783 continue; 784 return 0; 785 } 786 787 return config_match(parent, cf, aux); 788 } 789 790 /* 791 * Helper function: check whether the driver supports the interface attribute 792 * and return its descriptor structure. 793 */ 794 static const struct cfiattrdata * 795 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 796 { 797 const struct cfiattrdata * const *cpp; 798 799 if (cd->cd_attrs == NULL) 800 return 0; 801 802 for (cpp = cd->cd_attrs; *cpp; cpp++) { 803 if (STREQ((*cpp)->ci_name, ia)) { 804 /* Match. */ 805 return *cpp; 806 } 807 } 808 return 0; 809 } 810 811 /* 812 * Lookup an interface attribute description by name. 813 * If the driver is given, consider only its supported attributes. 814 */ 815 const struct cfiattrdata * 816 cfiattr_lookup(const char *name, const struct cfdriver *cd) 817 { 818 const struct cfdriver *d; 819 const struct cfiattrdata *ia; 820 821 if (cd) 822 return cfdriver_get_iattr(cd, name); 823 824 LIST_FOREACH(d, &allcfdrivers, cd_list) { 825 ia = cfdriver_get_iattr(d, name); 826 if (ia) 827 return ia; 828 } 829 return 0; 830 } 831 832 /* 833 * Determine if `parent' is a potential parent for a device spec based 834 * on `cfp'. 835 */ 836 static int 837 cfparent_match(const device_t parent, const struct cfparent *cfp) 838 { 839 struct cfdriver *pcd; 840 841 /* We don't match root nodes here. */ 842 if (cfp == NULL) 843 return 0; 844 845 pcd = parent->dv_cfdriver; 846 KASSERT(pcd != NULL); 847 848 /* 849 * First, ensure this parent has the correct interface 850 * attribute. 851 */ 852 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 853 return 0; 854 855 /* 856 * If no specific parent device instance was specified (i.e. 857 * we're attaching to the attribute only), we're done! 858 */ 859 if (cfp->cfp_parent == NULL) 860 return 1; 861 862 /* 863 * Check the parent device's name. 864 */ 865 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 866 return 0; /* not the same parent */ 867 868 /* 869 * Make sure the unit number matches. 870 */ 871 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 872 cfp->cfp_unit == parent->dv_unit) 873 return 1; 874 875 /* Unit numbers don't match. */ 876 return 0; 877 } 878 879 /* 880 * Helper for config_cfdata_attach(): check all devices whether it could be 881 * parent any attachment in the config data table passed, and rescan. 882 */ 883 static void 884 rescan_with_cfdata(const struct cfdata *cf) 885 { 886 device_t d; 887 const struct cfdata *cf1; 888 deviter_t di; 889 890 891 /* 892 * "alldevs" is likely longer than a modules's cfdata, so make it 893 * the outer loop. 894 */ 895 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 896 897 if (!(d->dv_cfattach->ca_rescan)) 898 continue; 899 900 for (cf1 = cf; cf1->cf_name; cf1++) { 901 902 if (!cfparent_match(d, cf1->cf_pspec)) 903 continue; 904 905 (*d->dv_cfattach->ca_rescan)(d, 906 cfdata_ifattr(cf1), cf1->cf_loc); 907 908 config_deferred(d); 909 } 910 } 911 deviter_release(&di); 912 } 913 914 /* 915 * Attach a supplemental config data table and rescan potential 916 * parent devices if required. 917 */ 918 int 919 config_cfdata_attach(cfdata_t cf, int scannow) 920 { 921 struct cftable *ct; 922 923 ct = kmem_alloc(sizeof(*ct), KM_SLEEP); 924 ct->ct_cfdata = cf; 925 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 926 927 if (scannow) 928 rescan_with_cfdata(cf); 929 930 return 0; 931 } 932 933 /* 934 * Helper for config_cfdata_detach: check whether a device is 935 * found through any attachment in the config data table. 936 */ 937 static int 938 dev_in_cfdata(device_t d, cfdata_t cf) 939 { 940 const struct cfdata *cf1; 941 942 for (cf1 = cf; cf1->cf_name; cf1++) 943 if (d->dv_cfdata == cf1) 944 return 1; 945 946 return 0; 947 } 948 949 /* 950 * Detach a supplemental config data table. Detach all devices found 951 * through that table (and thus keeping references to it) before. 952 */ 953 int 954 config_cfdata_detach(cfdata_t cf) 955 { 956 device_t d; 957 int error = 0; 958 struct cftable *ct; 959 deviter_t di; 960 961 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 962 d = deviter_next(&di)) { 963 if (!dev_in_cfdata(d, cf)) 964 continue; 965 if ((error = config_detach(d, 0)) != 0) 966 break; 967 } 968 deviter_release(&di); 969 if (error) { 970 aprint_error_dev(d, "unable to detach instance\n"); 971 return error; 972 } 973 974 TAILQ_FOREACH(ct, &allcftables, ct_list) { 975 if (ct->ct_cfdata == cf) { 976 TAILQ_REMOVE(&allcftables, ct, ct_list); 977 kmem_free(ct, sizeof(*ct)); 978 return 0; 979 } 980 } 981 982 /* not found -- shouldn't happen */ 983 return EINVAL; 984 } 985 986 /* 987 * Invoke the "match" routine for a cfdata entry on behalf of 988 * an external caller, usually a "submatch" routine. 989 */ 990 int 991 config_match(device_t parent, cfdata_t cf, void *aux) 992 { 993 struct cfattach *ca; 994 995 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 996 if (ca == NULL) { 997 /* No attachment for this entry, oh well. */ 998 return 0; 999 } 1000 1001 return (*ca->ca_match)(parent, cf, aux); 1002 } 1003 1004 /* 1005 * Iterate over all potential children of some device, calling the given 1006 * function (default being the child's match function) for each one. 1007 * Nonzero returns are matches; the highest value returned is considered 1008 * the best match. Return the `found child' if we got a match, or NULL 1009 * otherwise. The `aux' pointer is simply passed on through. 1010 * 1011 * Note that this function is designed so that it can be used to apply 1012 * an arbitrary function to all potential children (its return value 1013 * can be ignored). 1014 */ 1015 cfdata_t 1016 config_search_loc(cfsubmatch_t fn, device_t parent, 1017 const char *ifattr, const int *locs, void *aux) 1018 { 1019 struct cftable *ct; 1020 cfdata_t cf; 1021 struct matchinfo m; 1022 1023 KASSERT(config_initialized); 1024 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 1025 1026 m.fn = fn; 1027 m.parent = parent; 1028 m.locs = locs; 1029 m.aux = aux; 1030 m.match = NULL; 1031 m.pri = 0; 1032 1033 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1034 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1035 1036 /* We don't match root nodes here. */ 1037 if (!cf->cf_pspec) 1038 continue; 1039 1040 /* 1041 * Skip cf if no longer eligible, otherwise scan 1042 * through parents for one matching `parent', and 1043 * try match function. 1044 */ 1045 if (cf->cf_fstate == FSTATE_FOUND) 1046 continue; 1047 if (cf->cf_fstate == FSTATE_DNOTFOUND || 1048 cf->cf_fstate == FSTATE_DSTAR) 1049 continue; 1050 1051 /* 1052 * If an interface attribute was specified, 1053 * consider only children which attach to 1054 * that attribute. 1055 */ 1056 if (ifattr && !STREQ(ifattr, cfdata_ifattr(cf))) 1057 continue; 1058 1059 if (cfparent_match(parent, cf->cf_pspec)) 1060 mapply(&m, cf); 1061 } 1062 } 1063 return m.match; 1064 } 1065 1066 cfdata_t 1067 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 1068 void *aux) 1069 { 1070 1071 return config_search_loc(fn, parent, ifattr, NULL, aux); 1072 } 1073 1074 /* 1075 * Find the given root device. 1076 * This is much like config_search, but there is no parent. 1077 * Don't bother with multiple cfdata tables; the root node 1078 * must always be in the initial table. 1079 */ 1080 cfdata_t 1081 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 1082 { 1083 cfdata_t cf; 1084 const short *p; 1085 struct matchinfo m; 1086 1087 m.fn = fn; 1088 m.parent = ROOT; 1089 m.aux = aux; 1090 m.match = NULL; 1091 m.pri = 0; 1092 m.locs = 0; 1093 /* 1094 * Look at root entries for matching name. We do not bother 1095 * with found-state here since only one root should ever be 1096 * searched (and it must be done first). 1097 */ 1098 for (p = cfroots; *p >= 0; p++) { 1099 cf = &cfdata[*p]; 1100 if (strcmp(cf->cf_name, rootname) == 0) 1101 mapply(&m, cf); 1102 } 1103 return m.match; 1104 } 1105 1106 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 1107 1108 /* 1109 * The given `aux' argument describes a device that has been found 1110 * on the given parent, but not necessarily configured. Locate the 1111 * configuration data for that device (using the submatch function 1112 * provided, or using candidates' cd_match configuration driver 1113 * functions) and attach it, and return its device_t. If the device was 1114 * not configured, call the given `print' function and return NULL. 1115 */ 1116 device_t 1117 config_found_sm_loc(device_t parent, 1118 const char *ifattr, const int *locs, void *aux, 1119 cfprint_t print, cfsubmatch_t submatch) 1120 { 1121 cfdata_t cf; 1122 1123 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 1124 return(config_attach_loc(parent, cf, locs, aux, print)); 1125 if (print) { 1126 if (config_do_twiddle && cold) 1127 twiddle(); 1128 aprint_normal("%s", msgs[(*print)(aux, device_xname(parent))]); 1129 } 1130 1131 /* 1132 * This has the effect of mixing in a single timestamp to the 1133 * entropy pool. Experiments indicate the estimator will almost 1134 * always attribute one bit of entropy to this sample; analysis 1135 * of device attach/detach timestamps on FreeBSD indicates 4 1136 * bits of entropy/sample so this seems appropriately conservative. 1137 */ 1138 rnd_add_uint32(&rnd_autoconf_source, 0); 1139 return NULL; 1140 } 1141 1142 device_t 1143 config_found_ia(device_t parent, const char *ifattr, void *aux, 1144 cfprint_t print) 1145 { 1146 1147 return config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL); 1148 } 1149 1150 device_t 1151 config_found(device_t parent, void *aux, cfprint_t print) 1152 { 1153 1154 return config_found_sm_loc(parent, NULL, NULL, aux, print, NULL); 1155 } 1156 1157 /* 1158 * As above, but for root devices. 1159 */ 1160 device_t 1161 config_rootfound(const char *rootname, void *aux) 1162 { 1163 cfdata_t cf; 1164 1165 if ((cf = config_rootsearch(NULL, rootname, aux)) != NULL) 1166 return config_attach(ROOT, cf, aux, NULL); 1167 aprint_error("root device %s not configured\n", rootname); 1168 return NULL; 1169 } 1170 1171 /* just like sprintf(buf, "%d") except that it works from the end */ 1172 static char * 1173 number(char *ep, int n) 1174 { 1175 1176 *--ep = 0; 1177 while (n >= 10) { 1178 *--ep = (n % 10) + '0'; 1179 n /= 10; 1180 } 1181 *--ep = n + '0'; 1182 return ep; 1183 } 1184 1185 /* 1186 * Expand the size of the cd_devs array if necessary. 1187 * 1188 * The caller must hold alldevs_lock. config_makeroom() may release and 1189 * re-acquire alldevs_lock, so callers should re-check conditions such 1190 * as alldevs_nwrite == 0 and alldevs_nread == 0 when config_makeroom() 1191 * returns. 1192 */ 1193 static void 1194 config_makeroom(int n, struct cfdriver *cd) 1195 { 1196 int ondevs, nndevs; 1197 device_t *osp, *nsp; 1198 1199 KASSERT(mutex_owned(&alldevs_lock)); 1200 alldevs_nwrite++; 1201 1202 for (nndevs = MAX(4, cd->cd_ndevs); nndevs <= n; nndevs += nndevs) 1203 ; 1204 1205 while (n >= cd->cd_ndevs) { 1206 /* 1207 * Need to expand the array. 1208 */ 1209 ondevs = cd->cd_ndevs; 1210 osp = cd->cd_devs; 1211 1212 /* 1213 * Release alldevs_lock around allocation, which may 1214 * sleep. 1215 */ 1216 mutex_exit(&alldevs_lock); 1217 nsp = kmem_alloc(sizeof(device_t) * nndevs, KM_SLEEP); 1218 mutex_enter(&alldevs_lock); 1219 1220 /* 1221 * If another thread moved the array while we did 1222 * not hold alldevs_lock, try again. 1223 */ 1224 if (cd->cd_devs != osp) { 1225 mutex_exit(&alldevs_lock); 1226 kmem_free(nsp, sizeof(device_t) * nndevs); 1227 mutex_enter(&alldevs_lock); 1228 continue; 1229 } 1230 1231 memset(nsp + ondevs, 0, sizeof(device_t) * (nndevs - ondevs)); 1232 if (ondevs != 0) 1233 memcpy(nsp, cd->cd_devs, sizeof(device_t) * ondevs); 1234 1235 cd->cd_ndevs = nndevs; 1236 cd->cd_devs = nsp; 1237 if (ondevs != 0) { 1238 mutex_exit(&alldevs_lock); 1239 kmem_free(osp, sizeof(device_t) * ondevs); 1240 mutex_enter(&alldevs_lock); 1241 } 1242 } 1243 KASSERT(mutex_owned(&alldevs_lock)); 1244 alldevs_nwrite--; 1245 } 1246 1247 /* 1248 * Put dev into the devices list. 1249 */ 1250 static void 1251 config_devlink(device_t dev) 1252 { 1253 1254 mutex_enter(&alldevs_lock); 1255 1256 KASSERT(device_cfdriver(dev)->cd_devs[dev->dv_unit] == dev); 1257 1258 dev->dv_add_gen = alldevs_gen; 1259 /* It is safe to add a device to the tail of the list while 1260 * readers and writers are in the list. 1261 */ 1262 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); 1263 mutex_exit(&alldevs_lock); 1264 } 1265 1266 static void 1267 config_devfree(device_t dev) 1268 { 1269 KASSERT(dev->dv_flags & DVF_PRIV_ALLOC); 1270 1271 if (dev->dv_cfattach->ca_devsize > 0) 1272 kmem_free(dev->dv_private, dev->dv_cfattach->ca_devsize); 1273 kmem_free(dev, sizeof(*dev)); 1274 } 1275 1276 /* 1277 * Caller must hold alldevs_lock. 1278 */ 1279 static void 1280 config_devunlink(device_t dev, struct devicelist *garbage) 1281 { 1282 struct device_garbage *dg = &dev->dv_garbage; 1283 cfdriver_t cd = device_cfdriver(dev); 1284 int i; 1285 1286 KASSERT(mutex_owned(&alldevs_lock)); 1287 1288 /* Unlink from device list. Link to garbage list. */ 1289 TAILQ_REMOVE(&alldevs, dev, dv_list); 1290 TAILQ_INSERT_TAIL(garbage, dev, dv_list); 1291 1292 /* Remove from cfdriver's array. */ 1293 cd->cd_devs[dev->dv_unit] = NULL; 1294 1295 /* 1296 * If the device now has no units in use, unlink its softc array. 1297 */ 1298 for (i = 0; i < cd->cd_ndevs; i++) { 1299 if (cd->cd_devs[i] != NULL) 1300 break; 1301 } 1302 /* Nothing found. Unlink, now. Deallocate, later. */ 1303 if (i == cd->cd_ndevs) { 1304 dg->dg_ndevs = cd->cd_ndevs; 1305 dg->dg_devs = cd->cd_devs; 1306 cd->cd_devs = NULL; 1307 cd->cd_ndevs = 0; 1308 } 1309 } 1310 1311 static void 1312 config_devdelete(device_t dev) 1313 { 1314 struct device_garbage *dg = &dev->dv_garbage; 1315 device_lock_t dvl = device_getlock(dev); 1316 1317 if (dg->dg_devs != NULL) 1318 kmem_free(dg->dg_devs, sizeof(device_t) * dg->dg_ndevs); 1319 1320 cv_destroy(&dvl->dvl_cv); 1321 mutex_destroy(&dvl->dvl_mtx); 1322 1323 KASSERT(dev->dv_properties != NULL); 1324 prop_object_release(dev->dv_properties); 1325 1326 if (dev->dv_activity_handlers) 1327 panic("%s with registered handlers", __func__); 1328 1329 if (dev->dv_locators) { 1330 size_t amount = *--dev->dv_locators; 1331 kmem_free(dev->dv_locators, amount); 1332 } 1333 1334 config_devfree(dev); 1335 } 1336 1337 static int 1338 config_unit_nextfree(cfdriver_t cd, cfdata_t cf) 1339 { 1340 int unit; 1341 1342 if (cf->cf_fstate == FSTATE_STAR) { 1343 for (unit = cf->cf_unit; unit < cd->cd_ndevs; unit++) 1344 if (cd->cd_devs[unit] == NULL) 1345 break; 1346 /* 1347 * unit is now the unit of the first NULL device pointer, 1348 * or max(cd->cd_ndevs,cf->cf_unit). 1349 */ 1350 } else { 1351 unit = cf->cf_unit; 1352 if (unit < cd->cd_ndevs && cd->cd_devs[unit] != NULL) 1353 unit = -1; 1354 } 1355 return unit; 1356 } 1357 1358 static int 1359 config_unit_alloc(device_t dev, cfdriver_t cd, cfdata_t cf) 1360 { 1361 struct alldevs_foray af; 1362 int unit; 1363 1364 config_alldevs_enter(&af); 1365 for (;;) { 1366 unit = config_unit_nextfree(cd, cf); 1367 if (unit == -1) 1368 break; 1369 if (unit < cd->cd_ndevs) { 1370 cd->cd_devs[unit] = dev; 1371 dev->dv_unit = unit; 1372 break; 1373 } 1374 config_makeroom(unit, cd); 1375 } 1376 config_alldevs_exit(&af); 1377 1378 return unit; 1379 } 1380 1381 static device_t 1382 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1383 { 1384 cfdriver_t cd; 1385 cfattach_t ca; 1386 size_t lname, lunit; 1387 const char *xunit; 1388 int myunit; 1389 char num[10]; 1390 device_t dev; 1391 void *dev_private; 1392 const struct cfiattrdata *ia; 1393 device_lock_t dvl; 1394 1395 cd = config_cfdriver_lookup(cf->cf_name); 1396 if (cd == NULL) 1397 return NULL; 1398 1399 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1400 if (ca == NULL) 1401 return NULL; 1402 1403 /* get memory for all device vars */ 1404 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1405 if (ca->ca_devsize > 0) { 1406 dev_private = kmem_zalloc(ca->ca_devsize, KM_SLEEP); 1407 } else { 1408 dev_private = NULL; 1409 } 1410 dev = kmem_zalloc(sizeof(*dev), KM_SLEEP); 1411 1412 dev->dv_class = cd->cd_class; 1413 dev->dv_cfdata = cf; 1414 dev->dv_cfdriver = cd; 1415 dev->dv_cfattach = ca; 1416 dev->dv_activity_count = 0; 1417 dev->dv_activity_handlers = NULL; 1418 dev->dv_private = dev_private; 1419 dev->dv_flags = ca->ca_flags; /* inherit flags from class */ 1420 1421 myunit = config_unit_alloc(dev, cd, cf); 1422 if (myunit == -1) { 1423 config_devfree(dev); 1424 return NULL; 1425 } 1426 1427 /* compute length of name and decimal expansion of unit number */ 1428 lname = strlen(cd->cd_name); 1429 xunit = number(&num[sizeof(num)], myunit); 1430 lunit = &num[sizeof(num)] - xunit; 1431 if (lname + lunit > sizeof(dev->dv_xname)) 1432 panic("config_devalloc: device name too long"); 1433 1434 dvl = device_getlock(dev); 1435 1436 mutex_init(&dvl->dvl_mtx, MUTEX_DEFAULT, IPL_NONE); 1437 cv_init(&dvl->dvl_cv, "pmfsusp"); 1438 1439 memcpy(dev->dv_xname, cd->cd_name, lname); 1440 memcpy(dev->dv_xname + lname, xunit, lunit); 1441 dev->dv_parent = parent; 1442 if (parent != NULL) 1443 dev->dv_depth = parent->dv_depth + 1; 1444 else 1445 dev->dv_depth = 0; 1446 dev->dv_flags |= DVF_ACTIVE; /* always initially active */ 1447 if (locs) { 1448 KASSERT(parent); /* no locators at root */ 1449 ia = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 1450 dev->dv_locators = 1451 kmem_alloc(sizeof(int) * (ia->ci_loclen + 1), KM_SLEEP); 1452 *dev->dv_locators++ = sizeof(int) * (ia->ci_loclen + 1); 1453 memcpy(dev->dv_locators, locs, sizeof(int) * ia->ci_loclen); 1454 } 1455 dev->dv_properties = prop_dictionary_create(); 1456 KASSERT(dev->dv_properties != NULL); 1457 1458 prop_dictionary_set_string_nocopy(dev->dv_properties, 1459 "device-driver", dev->dv_cfdriver->cd_name); 1460 prop_dictionary_set_uint16(dev->dv_properties, 1461 "device-unit", dev->dv_unit); 1462 if (parent != NULL) { 1463 prop_dictionary_set_string(dev->dv_properties, 1464 "device-parent", device_xname(parent)); 1465 } 1466 1467 if (dev->dv_cfdriver->cd_attrs != NULL) 1468 config_add_attrib_dict(dev); 1469 1470 return dev; 1471 } 1472 1473 /* 1474 * Create an array of device attach attributes and add it 1475 * to the device's dv_properties dictionary. 1476 * 1477 * <key>interface-attributes</key> 1478 * <array> 1479 * <dict> 1480 * <key>attribute-name</key> 1481 * <string>foo</string> 1482 * <key>locators</key> 1483 * <array> 1484 * <dict> 1485 * <key>loc-name</key> 1486 * <string>foo-loc1</string> 1487 * </dict> 1488 * <dict> 1489 * <key>loc-name</key> 1490 * <string>foo-loc2</string> 1491 * <key>default</key> 1492 * <string>foo-loc2-default</string> 1493 * </dict> 1494 * ... 1495 * </array> 1496 * </dict> 1497 * ... 1498 * </array> 1499 */ 1500 1501 static void 1502 config_add_attrib_dict(device_t dev) 1503 { 1504 int i, j; 1505 const struct cfiattrdata *ci; 1506 prop_dictionary_t attr_dict, loc_dict; 1507 prop_array_t attr_array, loc_array; 1508 1509 if ((attr_array = prop_array_create()) == NULL) 1510 return; 1511 1512 for (i = 0; ; i++) { 1513 if ((ci = dev->dv_cfdriver->cd_attrs[i]) == NULL) 1514 break; 1515 if ((attr_dict = prop_dictionary_create()) == NULL) 1516 break; 1517 prop_dictionary_set_string_nocopy(attr_dict, "attribute-name", 1518 ci->ci_name); 1519 1520 /* Create an array of the locator names and defaults */ 1521 1522 if (ci->ci_loclen != 0 && 1523 (loc_array = prop_array_create()) != NULL) { 1524 for (j = 0; j < ci->ci_loclen; j++) { 1525 loc_dict = prop_dictionary_create(); 1526 if (loc_dict == NULL) 1527 continue; 1528 prop_dictionary_set_string_nocopy(loc_dict, 1529 "loc-name", ci->ci_locdesc[j].cld_name); 1530 if (ci->ci_locdesc[j].cld_defaultstr != NULL) 1531 prop_dictionary_set_string_nocopy( 1532 loc_dict, "default", 1533 ci->ci_locdesc[j].cld_defaultstr); 1534 prop_array_set(loc_array, j, loc_dict); 1535 prop_object_release(loc_dict); 1536 } 1537 prop_dictionary_set_and_rel(attr_dict, "locators", 1538 loc_array); 1539 } 1540 prop_array_add(attr_array, attr_dict); 1541 prop_object_release(attr_dict); 1542 } 1543 if (i == 0) 1544 prop_object_release(attr_array); 1545 else 1546 prop_dictionary_set_and_rel(dev->dv_properties, 1547 "interface-attributes", attr_array); 1548 1549 return; 1550 } 1551 1552 /* 1553 * Attach a found device. 1554 */ 1555 device_t 1556 config_attach_loc(device_t parent, cfdata_t cf, 1557 const int *locs, void *aux, cfprint_t print) 1558 { 1559 device_t dev; 1560 struct cftable *ct; 1561 const char *drvname; 1562 1563 dev = config_devalloc(parent, cf, locs); 1564 if (!dev) 1565 panic("config_attach: allocation of device softc failed"); 1566 1567 /* XXX redundant - see below? */ 1568 if (cf->cf_fstate != FSTATE_STAR) { 1569 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1570 cf->cf_fstate = FSTATE_FOUND; 1571 } 1572 1573 config_devlink(dev); 1574 1575 if (config_do_twiddle && cold) 1576 twiddle(); 1577 else 1578 aprint_naive("Found "); 1579 /* 1580 * We want the next two printfs for normal, verbose, and quiet, 1581 * but not silent (in which case, we're twiddling, instead). 1582 */ 1583 if (parent == ROOT) { 1584 aprint_naive("%s (root)", device_xname(dev)); 1585 aprint_normal("%s (root)", device_xname(dev)); 1586 } else { 1587 aprint_naive("%s at %s", device_xname(dev), 1588 device_xname(parent)); 1589 aprint_normal("%s at %s", device_xname(dev), 1590 device_xname(parent)); 1591 if (print) 1592 (void) (*print)(aux, NULL); 1593 } 1594 1595 /* 1596 * Before attaching, clobber any unfound devices that are 1597 * otherwise identical. 1598 * XXX code above is redundant? 1599 */ 1600 drvname = dev->dv_cfdriver->cd_name; 1601 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1602 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1603 if (STREQ(cf->cf_name, drvname) && 1604 cf->cf_unit == dev->dv_unit) { 1605 if (cf->cf_fstate == FSTATE_NOTFOUND) 1606 cf->cf_fstate = FSTATE_FOUND; 1607 } 1608 } 1609 } 1610 device_register(dev, aux); 1611 1612 /* Let userland know */ 1613 devmon_report_device(dev, true); 1614 1615 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1616 1617 if (((dev->dv_flags & DVF_ATTACH_INPROGRESS) == 0) 1618 && !device_pmf_is_registered(dev)) 1619 aprint_debug_dev(dev, 1620 "WARNING: power management not supported\n"); 1621 1622 config_process_deferred(&deferred_config_queue, dev); 1623 1624 device_register_post_config(dev, aux); 1625 return dev; 1626 } 1627 1628 device_t 1629 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1630 { 1631 1632 return config_attach_loc(parent, cf, NULL, aux, print); 1633 } 1634 1635 /* 1636 * As above, but for pseudo-devices. Pseudo-devices attached in this 1637 * way are silently inserted into the device tree, and their children 1638 * attached. 1639 * 1640 * Note that because pseudo-devices are attached silently, any information 1641 * the attach routine wishes to print should be prefixed with the device 1642 * name by the attach routine. 1643 */ 1644 device_t 1645 config_attach_pseudo(cfdata_t cf) 1646 { 1647 device_t dev; 1648 1649 dev = config_devalloc(ROOT, cf, NULL); 1650 if (!dev) 1651 return NULL; 1652 1653 /* XXX mark busy in cfdata */ 1654 1655 if (cf->cf_fstate != FSTATE_STAR) { 1656 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1657 cf->cf_fstate = FSTATE_FOUND; 1658 } 1659 1660 config_devlink(dev); 1661 1662 #if 0 /* XXXJRT not yet */ 1663 device_register(dev, NULL); /* like a root node */ 1664 #endif 1665 1666 /* Let userland know */ 1667 devmon_report_device(dev, true); 1668 1669 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1670 1671 config_process_deferred(&deferred_config_queue, dev); 1672 return dev; 1673 } 1674 1675 /* 1676 * Caller must hold alldevs_lock. 1677 */ 1678 static void 1679 config_collect_garbage(struct devicelist *garbage) 1680 { 1681 device_t dv; 1682 1683 KASSERT(!cpu_intr_p()); 1684 KASSERT(!cpu_softintr_p()); 1685 KASSERT(mutex_owned(&alldevs_lock)); 1686 1687 while (alldevs_nwrite == 0 && alldevs_nread == 0 && alldevs_garbage) { 1688 TAILQ_FOREACH(dv, &alldevs, dv_list) { 1689 if (dv->dv_del_gen != 0) 1690 break; 1691 } 1692 if (dv == NULL) { 1693 alldevs_garbage = false; 1694 break; 1695 } 1696 config_devunlink(dv, garbage); 1697 } 1698 KASSERT(mutex_owned(&alldevs_lock)); 1699 } 1700 1701 static void 1702 config_dump_garbage(struct devicelist *garbage) 1703 { 1704 device_t dv; 1705 1706 while ((dv = TAILQ_FIRST(garbage)) != NULL) { 1707 TAILQ_REMOVE(garbage, dv, dv_list); 1708 config_devdelete(dv); 1709 } 1710 } 1711 1712 /* 1713 * Detach a device. Optionally forced (e.g. because of hardware 1714 * removal) and quiet. Returns zero if successful, non-zero 1715 * (an error code) otherwise. 1716 * 1717 * Note that this code wants to be run from a process context, so 1718 * that the detach can sleep to allow processes which have a device 1719 * open to run and unwind their stacks. 1720 */ 1721 int 1722 config_detach(device_t dev, int flags) 1723 { 1724 struct alldevs_foray af; 1725 struct cftable *ct; 1726 cfdata_t cf; 1727 const struct cfattach *ca; 1728 struct cfdriver *cd; 1729 device_t d __diagused; 1730 int rv = 0; 1731 1732 cf = dev->dv_cfdata; 1733 KASSERTMSG((cf == NULL || cf->cf_fstate == FSTATE_FOUND || 1734 cf->cf_fstate == FSTATE_STAR), 1735 "config_detach: %s: bad device fstate: %d", 1736 device_xname(dev), cf ? cf->cf_fstate : -1); 1737 1738 cd = dev->dv_cfdriver; 1739 KASSERT(cd != NULL); 1740 1741 ca = dev->dv_cfattach; 1742 KASSERT(ca != NULL); 1743 1744 mutex_enter(&alldevs_lock); 1745 if (dev->dv_del_gen != 0) { 1746 mutex_exit(&alldevs_lock); 1747 #ifdef DIAGNOSTIC 1748 printf("%s: %s is already detached\n", __func__, 1749 device_xname(dev)); 1750 #endif /* DIAGNOSTIC */ 1751 return ENOENT; 1752 } 1753 alldevs_nwrite++; 1754 mutex_exit(&alldevs_lock); 1755 1756 if (!detachall && 1757 (flags & (DETACH_SHUTDOWN|DETACH_FORCE)) == DETACH_SHUTDOWN && 1758 (dev->dv_flags & DVF_DETACH_SHUTDOWN) == 0) { 1759 rv = EOPNOTSUPP; 1760 } else if (ca->ca_detach != NULL) { 1761 rv = (*ca->ca_detach)(dev, flags); 1762 } else 1763 rv = EOPNOTSUPP; 1764 1765 /* 1766 * If it was not possible to detach the device, then we either 1767 * panic() (for the forced but failed case), or return an error. 1768 * 1769 * If it was possible to detach the device, ensure that the 1770 * device is deactivated. 1771 */ 1772 if (rv == 0) 1773 dev->dv_flags &= ~DVF_ACTIVE; 1774 else if ((flags & DETACH_FORCE) == 0) 1775 goto out; 1776 else { 1777 panic("config_detach: forced detach of %s failed (%d)", 1778 device_xname(dev), rv); 1779 } 1780 1781 /* 1782 * The device has now been successfully detached. 1783 */ 1784 1785 /* Let userland know */ 1786 devmon_report_device(dev, false); 1787 1788 #ifdef DIAGNOSTIC 1789 /* 1790 * Sanity: If you're successfully detached, you should have no 1791 * children. (Note that because children must be attached 1792 * after parents, we only need to search the latter part of 1793 * the list.) 1794 */ 1795 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1796 d = TAILQ_NEXT(d, dv_list)) { 1797 if (d->dv_parent == dev && d->dv_del_gen == 0) { 1798 printf("config_detach: detached device %s" 1799 " has children %s\n", device_xname(dev), 1800 device_xname(d)); 1801 panic("config_detach"); 1802 } 1803 } 1804 #endif 1805 1806 /* notify the parent that the child is gone */ 1807 if (dev->dv_parent) { 1808 device_t p = dev->dv_parent; 1809 if (p->dv_cfattach->ca_childdetached) 1810 (*p->dv_cfattach->ca_childdetached)(p, dev); 1811 } 1812 1813 /* 1814 * Mark cfdata to show that the unit can be reused, if possible. 1815 */ 1816 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1817 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1818 if (STREQ(cf->cf_name, cd->cd_name)) { 1819 if (cf->cf_fstate == FSTATE_FOUND && 1820 cf->cf_unit == dev->dv_unit) 1821 cf->cf_fstate = FSTATE_NOTFOUND; 1822 } 1823 } 1824 } 1825 1826 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1827 aprint_normal_dev(dev, "detached\n"); 1828 1829 out: 1830 config_alldevs_enter(&af); 1831 KASSERT(alldevs_nwrite != 0); 1832 --alldevs_nwrite; 1833 if (rv == 0 && dev->dv_del_gen == 0) { 1834 if (alldevs_nwrite == 0 && alldevs_nread == 0) 1835 config_devunlink(dev, &af.af_garbage); 1836 else { 1837 dev->dv_del_gen = alldevs_gen; 1838 alldevs_garbage = true; 1839 } 1840 } 1841 config_alldevs_exit(&af); 1842 1843 return rv; 1844 } 1845 1846 int 1847 config_detach_children(device_t parent, int flags) 1848 { 1849 device_t dv; 1850 deviter_t di; 1851 int error = 0; 1852 1853 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1854 dv = deviter_next(&di)) { 1855 if (device_parent(dv) != parent) 1856 continue; 1857 if ((error = config_detach(dv, flags)) != 0) 1858 break; 1859 } 1860 deviter_release(&di); 1861 return error; 1862 } 1863 1864 device_t 1865 shutdown_first(struct shutdown_state *s) 1866 { 1867 if (!s->initialized) { 1868 deviter_init(&s->di, DEVITER_F_SHUTDOWN|DEVITER_F_LEAVES_FIRST); 1869 s->initialized = true; 1870 } 1871 return shutdown_next(s); 1872 } 1873 1874 device_t 1875 shutdown_next(struct shutdown_state *s) 1876 { 1877 device_t dv; 1878 1879 while ((dv = deviter_next(&s->di)) != NULL && !device_is_active(dv)) 1880 ; 1881 1882 if (dv == NULL) 1883 s->initialized = false; 1884 1885 return dv; 1886 } 1887 1888 bool 1889 config_detach_all(int how) 1890 { 1891 static struct shutdown_state s; 1892 device_t curdev; 1893 bool progress = false; 1894 int flags; 1895 1896 if ((how & (RB_NOSYNC|RB_DUMP)) != 0) 1897 return false; 1898 1899 if ((how & RB_POWERDOWN) == RB_POWERDOWN) 1900 flags = DETACH_SHUTDOWN | DETACH_POWEROFF; 1901 else 1902 flags = DETACH_SHUTDOWN; 1903 1904 for (curdev = shutdown_first(&s); curdev != NULL; 1905 curdev = shutdown_next(&s)) { 1906 aprint_debug(" detaching %s, ", device_xname(curdev)); 1907 if (config_detach(curdev, flags) == 0) { 1908 progress = true; 1909 aprint_debug("success."); 1910 } else 1911 aprint_debug("failed."); 1912 } 1913 return progress; 1914 } 1915 1916 static bool 1917 device_is_ancestor_of(device_t ancestor, device_t descendant) 1918 { 1919 device_t dv; 1920 1921 for (dv = descendant; dv != NULL; dv = device_parent(dv)) { 1922 if (device_parent(dv) == ancestor) 1923 return true; 1924 } 1925 return false; 1926 } 1927 1928 int 1929 config_deactivate(device_t dev) 1930 { 1931 deviter_t di; 1932 const struct cfattach *ca; 1933 device_t descendant; 1934 int s, rv = 0, oflags; 1935 1936 for (descendant = deviter_first(&di, DEVITER_F_ROOT_FIRST); 1937 descendant != NULL; 1938 descendant = deviter_next(&di)) { 1939 if (dev != descendant && 1940 !device_is_ancestor_of(dev, descendant)) 1941 continue; 1942 1943 if ((descendant->dv_flags & DVF_ACTIVE) == 0) 1944 continue; 1945 1946 ca = descendant->dv_cfattach; 1947 oflags = descendant->dv_flags; 1948 1949 descendant->dv_flags &= ~DVF_ACTIVE; 1950 if (ca->ca_activate == NULL) 1951 continue; 1952 s = splhigh(); 1953 rv = (*ca->ca_activate)(descendant, DVACT_DEACTIVATE); 1954 splx(s); 1955 if (rv != 0) 1956 descendant->dv_flags = oflags; 1957 } 1958 deviter_release(&di); 1959 return rv; 1960 } 1961 1962 /* 1963 * Defer the configuration of the specified device until all 1964 * of its parent's devices have been attached. 1965 */ 1966 void 1967 config_defer(device_t dev, void (*func)(device_t)) 1968 { 1969 struct deferred_config *dc; 1970 1971 if (dev->dv_parent == NULL) 1972 panic("config_defer: can't defer config of a root device"); 1973 1974 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1975 1976 config_pending_incr(dev); 1977 1978 mutex_enter(&config_misc_lock); 1979 #ifdef DIAGNOSTIC 1980 struct deferred_config *odc; 1981 TAILQ_FOREACH(odc, &deferred_config_queue, dc_queue) { 1982 if (odc->dc_dev == dev) 1983 panic("config_defer: deferred twice"); 1984 } 1985 #endif 1986 dc->dc_dev = dev; 1987 dc->dc_func = func; 1988 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1989 mutex_exit(&config_misc_lock); 1990 } 1991 1992 /* 1993 * Defer some autoconfiguration for a device until after interrupts 1994 * are enabled. 1995 */ 1996 void 1997 config_interrupts(device_t dev, void (*func)(device_t)) 1998 { 1999 struct deferred_config *dc; 2000 2001 /* 2002 * If interrupts are enabled, callback now. 2003 */ 2004 if (cold == 0) { 2005 (*func)(dev); 2006 return; 2007 } 2008 2009 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2010 2011 config_pending_incr(dev); 2012 2013 mutex_enter(&config_misc_lock); 2014 #ifdef DIAGNOSTIC 2015 struct deferred_config *odc; 2016 TAILQ_FOREACH(odc, &interrupt_config_queue, dc_queue) { 2017 if (odc->dc_dev == dev) 2018 panic("config_interrupts: deferred twice"); 2019 } 2020 #endif 2021 dc->dc_dev = dev; 2022 dc->dc_func = func; 2023 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 2024 dev->dv_flags |= DVF_ATTACH_INPROGRESS; 2025 mutex_exit(&config_misc_lock); 2026 } 2027 2028 /* 2029 * Defer some autoconfiguration for a device until after root file system 2030 * is mounted (to load firmware etc). 2031 */ 2032 void 2033 config_mountroot(device_t dev, void (*func)(device_t)) 2034 { 2035 struct deferred_config *dc; 2036 2037 /* 2038 * If root file system is mounted, callback now. 2039 */ 2040 if (root_is_mounted) { 2041 (*func)(dev); 2042 return; 2043 } 2044 2045 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2046 2047 mutex_enter(&config_misc_lock); 2048 #ifdef DIAGNOSTIC 2049 struct deferred_config *odc; 2050 TAILQ_FOREACH(odc, &mountroot_config_queue, dc_queue) { 2051 if (odc->dc_dev == dev) 2052 panic("%s: deferred twice", __func__); 2053 } 2054 #endif 2055 2056 dc->dc_dev = dev; 2057 dc->dc_func = func; 2058 TAILQ_INSERT_TAIL(&mountroot_config_queue, dc, dc_queue); 2059 mutex_exit(&config_misc_lock); 2060 } 2061 2062 /* 2063 * Process a deferred configuration queue. 2064 */ 2065 static void 2066 config_process_deferred(struct deferred_config_head *queue, device_t parent) 2067 { 2068 struct deferred_config *dc; 2069 2070 mutex_enter(&config_misc_lock); 2071 dc = TAILQ_FIRST(queue); 2072 while (dc) { 2073 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 2074 TAILQ_REMOVE(queue, dc, dc_queue); 2075 mutex_exit(&config_misc_lock); 2076 2077 (*dc->dc_func)(dc->dc_dev); 2078 config_pending_decr(dc->dc_dev); 2079 kmem_free(dc, sizeof(*dc)); 2080 2081 mutex_enter(&config_misc_lock); 2082 /* Restart, queue might have changed */ 2083 dc = TAILQ_FIRST(queue); 2084 } else { 2085 dc = TAILQ_NEXT(dc, dc_queue); 2086 } 2087 } 2088 mutex_exit(&config_misc_lock); 2089 } 2090 2091 /* 2092 * Manipulate the config_pending semaphore. 2093 */ 2094 void 2095 config_pending_incr(device_t dev) 2096 { 2097 2098 mutex_enter(&config_misc_lock); 2099 KASSERTMSG(dev->dv_pending < INT_MAX, 2100 "%s: excess config_pending_incr", device_xname(dev)); 2101 if (dev->dv_pending++ == 0) 2102 TAILQ_INSERT_TAIL(&config_pending, dev, dv_pending_list); 2103 #ifdef DEBUG_AUTOCONF 2104 printf("%s: %s %d\n", __func__, device_xname(dev), dev->dv_pending); 2105 #endif 2106 mutex_exit(&config_misc_lock); 2107 } 2108 2109 void 2110 config_pending_decr(device_t dev) 2111 { 2112 2113 mutex_enter(&config_misc_lock); 2114 KASSERTMSG(dev->dv_pending > 0, 2115 "%s: excess config_pending_decr", device_xname(dev)); 2116 if (--dev->dv_pending == 0) 2117 TAILQ_REMOVE(&config_pending, dev, dv_pending_list); 2118 #ifdef DEBUG_AUTOCONF 2119 printf("%s: %s %d\n", __func__, device_xname(dev), dev->dv_pending); 2120 #endif 2121 if (TAILQ_EMPTY(&config_pending)) 2122 cv_broadcast(&config_misc_cv); 2123 mutex_exit(&config_misc_lock); 2124 } 2125 2126 /* 2127 * Register a "finalization" routine. Finalization routines are 2128 * called iteratively once all real devices have been found during 2129 * autoconfiguration, for as long as any one finalizer has done 2130 * any work. 2131 */ 2132 int 2133 config_finalize_register(device_t dev, int (*fn)(device_t)) 2134 { 2135 struct finalize_hook *f; 2136 2137 /* 2138 * If finalization has already been done, invoke the 2139 * callback function now. 2140 */ 2141 if (config_finalize_done) { 2142 while ((*fn)(dev) != 0) 2143 /* loop */ ; 2144 return 0; 2145 } 2146 2147 /* Ensure this isn't already on the list. */ 2148 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 2149 if (f->f_func == fn && f->f_dev == dev) 2150 return EEXIST; 2151 } 2152 2153 f = kmem_alloc(sizeof(*f), KM_SLEEP); 2154 f->f_func = fn; 2155 f->f_dev = dev; 2156 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 2157 2158 return 0; 2159 } 2160 2161 void 2162 config_finalize(void) 2163 { 2164 struct finalize_hook *f; 2165 struct pdevinit *pdev; 2166 extern struct pdevinit pdevinit[]; 2167 int errcnt, rv; 2168 2169 /* 2170 * Now that device driver threads have been created, wait for 2171 * them to finish any deferred autoconfiguration. 2172 */ 2173 mutex_enter(&config_misc_lock); 2174 while (!TAILQ_EMPTY(&config_pending)) { 2175 device_t dev; 2176 TAILQ_FOREACH(dev, &config_pending, dv_pending_list) 2177 aprint_debug_dev(dev, "holding up boot\n"); 2178 cv_wait(&config_misc_cv, &config_misc_lock); 2179 } 2180 mutex_exit(&config_misc_lock); 2181 2182 KERNEL_LOCK(1, NULL); 2183 2184 /* Attach pseudo-devices. */ 2185 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 2186 (*pdev->pdev_attach)(pdev->pdev_count); 2187 2188 /* Run the hooks until none of them does any work. */ 2189 do { 2190 rv = 0; 2191 TAILQ_FOREACH(f, &config_finalize_list, f_list) 2192 rv |= (*f->f_func)(f->f_dev); 2193 } while (rv != 0); 2194 2195 config_finalize_done = 1; 2196 2197 /* Now free all the hooks. */ 2198 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 2199 TAILQ_REMOVE(&config_finalize_list, f, f_list); 2200 kmem_free(f, sizeof(*f)); 2201 } 2202 2203 KERNEL_UNLOCK_ONE(NULL); 2204 2205 errcnt = aprint_get_error_count(); 2206 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 2207 (boothowto & AB_VERBOSE) == 0) { 2208 mutex_enter(&config_misc_lock); 2209 if (config_do_twiddle) { 2210 config_do_twiddle = 0; 2211 printf_nolog(" done.\n"); 2212 } 2213 mutex_exit(&config_misc_lock); 2214 } 2215 if (errcnt != 0) { 2216 printf("WARNING: %d error%s while detecting hardware; " 2217 "check system log.\n", errcnt, 2218 errcnt == 1 ? "" : "s"); 2219 } 2220 } 2221 2222 void 2223 config_twiddle_init(void) 2224 { 2225 2226 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 2227 config_do_twiddle = 1; 2228 } 2229 callout_setfunc(&config_twiddle_ch, config_twiddle_fn, NULL); 2230 } 2231 2232 void 2233 config_twiddle_fn(void *cookie) 2234 { 2235 2236 mutex_enter(&config_misc_lock); 2237 if (config_do_twiddle) { 2238 twiddle(); 2239 callout_schedule(&config_twiddle_ch, mstohz(100)); 2240 } 2241 mutex_exit(&config_misc_lock); 2242 } 2243 2244 static void 2245 config_alldevs_enter(struct alldevs_foray *af) 2246 { 2247 TAILQ_INIT(&af->af_garbage); 2248 mutex_enter(&alldevs_lock); 2249 config_collect_garbage(&af->af_garbage); 2250 } 2251 2252 static void 2253 config_alldevs_exit(struct alldevs_foray *af) 2254 { 2255 mutex_exit(&alldevs_lock); 2256 config_dump_garbage(&af->af_garbage); 2257 } 2258 2259 /* 2260 * device_lookup: 2261 * 2262 * Look up a device instance for a given driver. 2263 */ 2264 device_t 2265 device_lookup(cfdriver_t cd, int unit) 2266 { 2267 device_t dv; 2268 2269 mutex_enter(&alldevs_lock); 2270 if (unit < 0 || unit >= cd->cd_ndevs) 2271 dv = NULL; 2272 else if ((dv = cd->cd_devs[unit]) != NULL && dv->dv_del_gen != 0) 2273 dv = NULL; 2274 mutex_exit(&alldevs_lock); 2275 2276 return dv; 2277 } 2278 2279 /* 2280 * device_lookup_private: 2281 * 2282 * Look up a softc instance for a given driver. 2283 */ 2284 void * 2285 device_lookup_private(cfdriver_t cd, int unit) 2286 { 2287 2288 return device_private(device_lookup(cd, unit)); 2289 } 2290 2291 /* 2292 * device_find_by_xname: 2293 * 2294 * Returns the device of the given name or NULL if it doesn't exist. 2295 */ 2296 device_t 2297 device_find_by_xname(const char *name) 2298 { 2299 device_t dv; 2300 deviter_t di; 2301 2302 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 2303 if (strcmp(device_xname(dv), name) == 0) 2304 break; 2305 } 2306 deviter_release(&di); 2307 2308 return dv; 2309 } 2310 2311 /* 2312 * device_find_by_driver_unit: 2313 * 2314 * Returns the device of the given driver name and unit or 2315 * NULL if it doesn't exist. 2316 */ 2317 device_t 2318 device_find_by_driver_unit(const char *name, int unit) 2319 { 2320 struct cfdriver *cd; 2321 2322 if ((cd = config_cfdriver_lookup(name)) == NULL) 2323 return NULL; 2324 return device_lookup(cd, unit); 2325 } 2326 2327 /* 2328 * device_compatible_match: 2329 * 2330 * Match a driver's "compatible" data against a device's 2331 * "compatible" strings. If a match is found, we return 2332 * a weighted match result, and optionally the matching 2333 * entry. 2334 */ 2335 int 2336 device_compatible_match(const char **device_compats, int ndevice_compats, 2337 const struct device_compatible_entry *driver_compats, 2338 const struct device_compatible_entry **matching_entryp) 2339 { 2340 const struct device_compatible_entry *dce = NULL; 2341 int i, match_weight; 2342 2343 if (ndevice_compats == 0 || device_compats == NULL || 2344 driver_compats == NULL) 2345 return 0; 2346 2347 /* 2348 * We take the first match because we start with the most-specific 2349 * device compatible string. 2350 */ 2351 for (i = 0, match_weight = ndevice_compats - 1; 2352 i < ndevice_compats; 2353 i++, match_weight--) { 2354 for (dce = driver_compats; dce->compat != NULL; dce++) { 2355 if (strcmp(dce->compat, device_compats[i]) == 0) { 2356 KASSERT(match_weight >= 0); 2357 if (matching_entryp) 2358 *matching_entryp = dce; 2359 return 1 + match_weight; 2360 } 2361 } 2362 } 2363 return 0; 2364 } 2365 2366 /* 2367 * Power management related functions. 2368 */ 2369 2370 bool 2371 device_pmf_is_registered(device_t dev) 2372 { 2373 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 2374 } 2375 2376 bool 2377 device_pmf_driver_suspend(device_t dev, const pmf_qual_t *qual) 2378 { 2379 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2380 return true; 2381 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2382 return false; 2383 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2384 dev->dv_driver_suspend != NULL && 2385 !(*dev->dv_driver_suspend)(dev, qual)) 2386 return false; 2387 2388 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 2389 return true; 2390 } 2391 2392 bool 2393 device_pmf_driver_resume(device_t dev, const pmf_qual_t *qual) 2394 { 2395 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2396 return true; 2397 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2398 return false; 2399 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2400 dev->dv_driver_resume != NULL && 2401 !(*dev->dv_driver_resume)(dev, qual)) 2402 return false; 2403 2404 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2405 return true; 2406 } 2407 2408 bool 2409 device_pmf_driver_shutdown(device_t dev, int how) 2410 { 2411 2412 if (*dev->dv_driver_shutdown != NULL && 2413 !(*dev->dv_driver_shutdown)(dev, how)) 2414 return false; 2415 return true; 2416 } 2417 2418 bool 2419 device_pmf_driver_register(device_t dev, 2420 bool (*suspend)(device_t, const pmf_qual_t *), 2421 bool (*resume)(device_t, const pmf_qual_t *), 2422 bool (*shutdown)(device_t, int)) 2423 { 2424 dev->dv_driver_suspend = suspend; 2425 dev->dv_driver_resume = resume; 2426 dev->dv_driver_shutdown = shutdown; 2427 dev->dv_flags |= DVF_POWER_HANDLERS; 2428 return true; 2429 } 2430 2431 static const char * 2432 curlwp_name(void) 2433 { 2434 if (curlwp->l_name != NULL) 2435 return curlwp->l_name; 2436 else 2437 return curlwp->l_proc->p_comm; 2438 } 2439 2440 void 2441 device_pmf_driver_deregister(device_t dev) 2442 { 2443 device_lock_t dvl = device_getlock(dev); 2444 2445 dev->dv_driver_suspend = NULL; 2446 dev->dv_driver_resume = NULL; 2447 2448 mutex_enter(&dvl->dvl_mtx); 2449 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2450 while (dvl->dvl_nlock > 0 || dvl->dvl_nwait > 0) { 2451 /* Wake a thread that waits for the lock. That 2452 * thread will fail to acquire the lock, and then 2453 * it will wake the next thread that waits for the 2454 * lock, or else it will wake us. 2455 */ 2456 cv_signal(&dvl->dvl_cv); 2457 pmflock_debug(dev, __func__, __LINE__); 2458 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2459 pmflock_debug(dev, __func__, __LINE__); 2460 } 2461 mutex_exit(&dvl->dvl_mtx); 2462 } 2463 2464 bool 2465 device_pmf_driver_child_register(device_t dev) 2466 { 2467 device_t parent = device_parent(dev); 2468 2469 if (parent == NULL || parent->dv_driver_child_register == NULL) 2470 return true; 2471 return (*parent->dv_driver_child_register)(dev); 2472 } 2473 2474 void 2475 device_pmf_driver_set_child_register(device_t dev, 2476 bool (*child_register)(device_t)) 2477 { 2478 dev->dv_driver_child_register = child_register; 2479 } 2480 2481 static void 2482 pmflock_debug(device_t dev, const char *func, int line) 2483 { 2484 device_lock_t dvl = device_getlock(dev); 2485 2486 aprint_debug_dev(dev, 2487 "%s.%d, %s dvl_nlock %d dvl_nwait %d dv_flags %x\n", func, line, 2488 curlwp_name(), dvl->dvl_nlock, dvl->dvl_nwait, dev->dv_flags); 2489 } 2490 2491 static bool 2492 device_pmf_lock1(device_t dev) 2493 { 2494 device_lock_t dvl = device_getlock(dev); 2495 2496 while (device_pmf_is_registered(dev) && 2497 dvl->dvl_nlock > 0 && dvl->dvl_holder != curlwp) { 2498 dvl->dvl_nwait++; 2499 pmflock_debug(dev, __func__, __LINE__); 2500 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2501 pmflock_debug(dev, __func__, __LINE__); 2502 dvl->dvl_nwait--; 2503 } 2504 if (!device_pmf_is_registered(dev)) { 2505 pmflock_debug(dev, __func__, __LINE__); 2506 /* We could not acquire the lock, but some other thread may 2507 * wait for it, also. Wake that thread. 2508 */ 2509 cv_signal(&dvl->dvl_cv); 2510 return false; 2511 } 2512 dvl->dvl_nlock++; 2513 dvl->dvl_holder = curlwp; 2514 pmflock_debug(dev, __func__, __LINE__); 2515 return true; 2516 } 2517 2518 bool 2519 device_pmf_lock(device_t dev) 2520 { 2521 bool rc; 2522 device_lock_t dvl = device_getlock(dev); 2523 2524 mutex_enter(&dvl->dvl_mtx); 2525 rc = device_pmf_lock1(dev); 2526 mutex_exit(&dvl->dvl_mtx); 2527 2528 return rc; 2529 } 2530 2531 void 2532 device_pmf_unlock(device_t dev) 2533 { 2534 device_lock_t dvl = device_getlock(dev); 2535 2536 KASSERT(dvl->dvl_nlock > 0); 2537 mutex_enter(&dvl->dvl_mtx); 2538 if (--dvl->dvl_nlock == 0) 2539 dvl->dvl_holder = NULL; 2540 cv_signal(&dvl->dvl_cv); 2541 pmflock_debug(dev, __func__, __LINE__); 2542 mutex_exit(&dvl->dvl_mtx); 2543 } 2544 2545 device_lock_t 2546 device_getlock(device_t dev) 2547 { 2548 return &dev->dv_lock; 2549 } 2550 2551 void * 2552 device_pmf_bus_private(device_t dev) 2553 { 2554 return dev->dv_bus_private; 2555 } 2556 2557 bool 2558 device_pmf_bus_suspend(device_t dev, const pmf_qual_t *qual) 2559 { 2560 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2561 return true; 2562 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2563 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2564 return false; 2565 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2566 dev->dv_bus_suspend != NULL && 2567 !(*dev->dv_bus_suspend)(dev, qual)) 2568 return false; 2569 2570 dev->dv_flags |= DVF_BUS_SUSPENDED; 2571 return true; 2572 } 2573 2574 bool 2575 device_pmf_bus_resume(device_t dev, const pmf_qual_t *qual) 2576 { 2577 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2578 return true; 2579 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2580 dev->dv_bus_resume != NULL && 2581 !(*dev->dv_bus_resume)(dev, qual)) 2582 return false; 2583 2584 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2585 return true; 2586 } 2587 2588 bool 2589 device_pmf_bus_shutdown(device_t dev, int how) 2590 { 2591 2592 if (*dev->dv_bus_shutdown != NULL && 2593 !(*dev->dv_bus_shutdown)(dev, how)) 2594 return false; 2595 return true; 2596 } 2597 2598 void 2599 device_pmf_bus_register(device_t dev, void *priv, 2600 bool (*suspend)(device_t, const pmf_qual_t *), 2601 bool (*resume)(device_t, const pmf_qual_t *), 2602 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2603 { 2604 dev->dv_bus_private = priv; 2605 dev->dv_bus_resume = resume; 2606 dev->dv_bus_suspend = suspend; 2607 dev->dv_bus_shutdown = shutdown; 2608 dev->dv_bus_deregister = deregister; 2609 } 2610 2611 void 2612 device_pmf_bus_deregister(device_t dev) 2613 { 2614 if (dev->dv_bus_deregister == NULL) 2615 return; 2616 (*dev->dv_bus_deregister)(dev); 2617 dev->dv_bus_private = NULL; 2618 dev->dv_bus_suspend = NULL; 2619 dev->dv_bus_resume = NULL; 2620 dev->dv_bus_deregister = NULL; 2621 } 2622 2623 void * 2624 device_pmf_class_private(device_t dev) 2625 { 2626 return dev->dv_class_private; 2627 } 2628 2629 bool 2630 device_pmf_class_suspend(device_t dev, const pmf_qual_t *qual) 2631 { 2632 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2633 return true; 2634 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2635 dev->dv_class_suspend != NULL && 2636 !(*dev->dv_class_suspend)(dev, qual)) 2637 return false; 2638 2639 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2640 return true; 2641 } 2642 2643 bool 2644 device_pmf_class_resume(device_t dev, const pmf_qual_t *qual) 2645 { 2646 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2647 return true; 2648 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2649 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2650 return false; 2651 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2652 dev->dv_class_resume != NULL && 2653 !(*dev->dv_class_resume)(dev, qual)) 2654 return false; 2655 2656 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2657 return true; 2658 } 2659 2660 void 2661 device_pmf_class_register(device_t dev, void *priv, 2662 bool (*suspend)(device_t, const pmf_qual_t *), 2663 bool (*resume)(device_t, const pmf_qual_t *), 2664 void (*deregister)(device_t)) 2665 { 2666 dev->dv_class_private = priv; 2667 dev->dv_class_suspend = suspend; 2668 dev->dv_class_resume = resume; 2669 dev->dv_class_deregister = deregister; 2670 } 2671 2672 void 2673 device_pmf_class_deregister(device_t dev) 2674 { 2675 if (dev->dv_class_deregister == NULL) 2676 return; 2677 (*dev->dv_class_deregister)(dev); 2678 dev->dv_class_private = NULL; 2679 dev->dv_class_suspend = NULL; 2680 dev->dv_class_resume = NULL; 2681 dev->dv_class_deregister = NULL; 2682 } 2683 2684 bool 2685 device_active(device_t dev, devactive_t type) 2686 { 2687 size_t i; 2688 2689 if (dev->dv_activity_count == 0) 2690 return false; 2691 2692 for (i = 0; i < dev->dv_activity_count; ++i) { 2693 if (dev->dv_activity_handlers[i] == NULL) 2694 break; 2695 (*dev->dv_activity_handlers[i])(dev, type); 2696 } 2697 2698 return true; 2699 } 2700 2701 bool 2702 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2703 { 2704 void (**new_handlers)(device_t, devactive_t); 2705 void (**old_handlers)(device_t, devactive_t); 2706 size_t i, old_size, new_size; 2707 int s; 2708 2709 old_handlers = dev->dv_activity_handlers; 2710 old_size = dev->dv_activity_count; 2711 2712 KASSERT(old_size == 0 || old_handlers != NULL); 2713 2714 for (i = 0; i < old_size; ++i) { 2715 KASSERT(old_handlers[i] != handler); 2716 if (old_handlers[i] == NULL) { 2717 old_handlers[i] = handler; 2718 return true; 2719 } 2720 } 2721 2722 new_size = old_size + 4; 2723 new_handlers = kmem_alloc(sizeof(void *) * new_size, KM_SLEEP); 2724 2725 for (i = 0; i < old_size; ++i) 2726 new_handlers[i] = old_handlers[i]; 2727 new_handlers[old_size] = handler; 2728 for (i = old_size+1; i < new_size; ++i) 2729 new_handlers[i] = NULL; 2730 2731 s = splhigh(); 2732 dev->dv_activity_count = new_size; 2733 dev->dv_activity_handlers = new_handlers; 2734 splx(s); 2735 2736 if (old_size > 0) 2737 kmem_free(old_handlers, sizeof(void *) * old_size); 2738 2739 return true; 2740 } 2741 2742 void 2743 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2744 { 2745 void (**old_handlers)(device_t, devactive_t); 2746 size_t i, old_size; 2747 int s; 2748 2749 old_handlers = dev->dv_activity_handlers; 2750 old_size = dev->dv_activity_count; 2751 2752 for (i = 0; i < old_size; ++i) { 2753 if (old_handlers[i] == handler) 2754 break; 2755 if (old_handlers[i] == NULL) 2756 return; /* XXX panic? */ 2757 } 2758 2759 if (i == old_size) 2760 return; /* XXX panic? */ 2761 2762 for (; i < old_size - 1; ++i) { 2763 if ((old_handlers[i] = old_handlers[i + 1]) != NULL) 2764 continue; 2765 2766 if (i == 0) { 2767 s = splhigh(); 2768 dev->dv_activity_count = 0; 2769 dev->dv_activity_handlers = NULL; 2770 splx(s); 2771 kmem_free(old_handlers, sizeof(void *) * old_size); 2772 } 2773 return; 2774 } 2775 old_handlers[i] = NULL; 2776 } 2777 2778 /* Return true iff the device_t `dev' exists at generation `gen'. */ 2779 static bool 2780 device_exists_at(device_t dv, devgen_t gen) 2781 { 2782 return (dv->dv_del_gen == 0 || dv->dv_del_gen > gen) && 2783 dv->dv_add_gen <= gen; 2784 } 2785 2786 static bool 2787 deviter_visits(const deviter_t *di, device_t dv) 2788 { 2789 return device_exists_at(dv, di->di_gen); 2790 } 2791 2792 /* 2793 * Device Iteration 2794 * 2795 * deviter_t: a device iterator. Holds state for a "walk" visiting 2796 * each device_t's in the device tree. 2797 * 2798 * deviter_init(di, flags): initialize the device iterator `di' 2799 * to "walk" the device tree. deviter_next(di) will return 2800 * the first device_t in the device tree, or NULL if there are 2801 * no devices. 2802 * 2803 * `flags' is one or more of DEVITER_F_RW, indicating that the 2804 * caller intends to modify the device tree by calling 2805 * config_detach(9) on devices in the order that the iterator 2806 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2807 * nearest the "root" of the device tree to be returned, first; 2808 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2809 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2810 * indicating both that deviter_init() should not respect any 2811 * locks on the device tree, and that deviter_next(di) may run 2812 * in more than one LWP before the walk has finished. 2813 * 2814 * Only one DEVITER_F_RW iterator may be in the device tree at 2815 * once. 2816 * 2817 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2818 * 2819 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2820 * DEVITER_F_LEAVES_FIRST are used in combination. 2821 * 2822 * deviter_first(di, flags): initialize the device iterator `di' 2823 * and return the first device_t in the device tree, or NULL 2824 * if there are no devices. The statement 2825 * 2826 * dv = deviter_first(di); 2827 * 2828 * is shorthand for 2829 * 2830 * deviter_init(di); 2831 * dv = deviter_next(di); 2832 * 2833 * deviter_next(di): return the next device_t in the device tree, 2834 * or NULL if there are no more devices. deviter_next(di) 2835 * is undefined if `di' was not initialized with deviter_init() or 2836 * deviter_first(). 2837 * 2838 * deviter_release(di): stops iteration (subsequent calls to 2839 * deviter_next() will return NULL), releases any locks and 2840 * resources held by the device iterator. 2841 * 2842 * Device iteration does not return device_t's in any particular 2843 * order. An iterator will never return the same device_t twice. 2844 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2845 * is called repeatedly on the same `di', it will eventually return 2846 * NULL. It is ok to attach/detach devices during device iteration. 2847 */ 2848 void 2849 deviter_init(deviter_t *di, deviter_flags_t flags) 2850 { 2851 device_t dv; 2852 2853 memset(di, 0, sizeof(*di)); 2854 2855 if ((flags & DEVITER_F_SHUTDOWN) != 0) 2856 flags |= DEVITER_F_RW; 2857 2858 mutex_enter(&alldevs_lock); 2859 if ((flags & DEVITER_F_RW) != 0) 2860 alldevs_nwrite++; 2861 else 2862 alldevs_nread++; 2863 di->di_gen = alldevs_gen++; 2864 di->di_flags = flags; 2865 2866 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2867 case DEVITER_F_LEAVES_FIRST: 2868 TAILQ_FOREACH(dv, &alldevs, dv_list) { 2869 if (!deviter_visits(di, dv)) 2870 continue; 2871 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2872 } 2873 break; 2874 case DEVITER_F_ROOT_FIRST: 2875 TAILQ_FOREACH(dv, &alldevs, dv_list) { 2876 if (!deviter_visits(di, dv)) 2877 continue; 2878 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2879 } 2880 break; 2881 default: 2882 break; 2883 } 2884 2885 deviter_reinit(di); 2886 mutex_exit(&alldevs_lock); 2887 } 2888 2889 static void 2890 deviter_reinit(deviter_t *di) 2891 { 2892 2893 KASSERT(mutex_owned(&alldevs_lock)); 2894 if ((di->di_flags & DEVITER_F_RW) != 0) 2895 di->di_prev = TAILQ_LAST(&alldevs, devicelist); 2896 else 2897 di->di_prev = TAILQ_FIRST(&alldevs); 2898 } 2899 2900 device_t 2901 deviter_first(deviter_t *di, deviter_flags_t flags) 2902 { 2903 2904 deviter_init(di, flags); 2905 return deviter_next(di); 2906 } 2907 2908 static device_t 2909 deviter_next2(deviter_t *di) 2910 { 2911 device_t dv; 2912 2913 KASSERT(mutex_owned(&alldevs_lock)); 2914 2915 dv = di->di_prev; 2916 2917 if (dv == NULL) 2918 return NULL; 2919 2920 if ((di->di_flags & DEVITER_F_RW) != 0) 2921 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2922 else 2923 di->di_prev = TAILQ_NEXT(dv, dv_list); 2924 2925 return dv; 2926 } 2927 2928 static device_t 2929 deviter_next1(deviter_t *di) 2930 { 2931 device_t dv; 2932 2933 KASSERT(mutex_owned(&alldevs_lock)); 2934 2935 do { 2936 dv = deviter_next2(di); 2937 } while (dv != NULL && !deviter_visits(di, dv)); 2938 2939 return dv; 2940 } 2941 2942 device_t 2943 deviter_next(deviter_t *di) 2944 { 2945 device_t dv = NULL; 2946 2947 mutex_enter(&alldevs_lock); 2948 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2949 case 0: 2950 dv = deviter_next1(di); 2951 break; 2952 case DEVITER_F_LEAVES_FIRST: 2953 while (di->di_curdepth >= 0) { 2954 if ((dv = deviter_next1(di)) == NULL) { 2955 di->di_curdepth--; 2956 deviter_reinit(di); 2957 } else if (dv->dv_depth == di->di_curdepth) 2958 break; 2959 } 2960 break; 2961 case DEVITER_F_ROOT_FIRST: 2962 while (di->di_curdepth <= di->di_maxdepth) { 2963 if ((dv = deviter_next1(di)) == NULL) { 2964 di->di_curdepth++; 2965 deviter_reinit(di); 2966 } else if (dv->dv_depth == di->di_curdepth) 2967 break; 2968 } 2969 break; 2970 default: 2971 break; 2972 } 2973 mutex_exit(&alldevs_lock); 2974 2975 return dv; 2976 } 2977 2978 void 2979 deviter_release(deviter_t *di) 2980 { 2981 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 2982 2983 mutex_enter(&alldevs_lock); 2984 if (rw) 2985 --alldevs_nwrite; 2986 else 2987 --alldevs_nread; 2988 /* XXX wake a garbage-collection thread */ 2989 mutex_exit(&alldevs_lock); 2990 } 2991 2992 const char * 2993 cfdata_ifattr(const struct cfdata *cf) 2994 { 2995 return cf->cf_pspec->cfp_iattr; 2996 } 2997 2998 bool 2999 ifattr_match(const char *snull, const char *t) 3000 { 3001 return (snull == NULL) || strcmp(snull, t) == 0; 3002 } 3003 3004 void 3005 null_childdetached(device_t self, device_t child) 3006 { 3007 /* do nothing */ 3008 } 3009 3010 static void 3011 sysctl_detach_setup(struct sysctllog **clog) 3012 { 3013 3014 sysctl_createv(clog, 0, NULL, NULL, 3015 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 3016 CTLTYPE_BOOL, "detachall", 3017 SYSCTL_DESCR("Detach all devices at shutdown"), 3018 NULL, 0, &detachall, 0, 3019 CTL_KERN, CTL_CREATE, CTL_EOL); 3020 } 3021
Indexes created Thu Sep 25 02:09:54 GMT 2025