subr_autoconf.c revision 1.266
1 /* $NetBSD: subr_autoconf.c,v 1.266 2020/02/20 21:14:23 jdolecek Exp $ */ 2 3 /* 4 * Copyright (c) 1996, 2000 Christopher G. Demetriou 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed for the 18 * NetBSD Project. See http://www.NetBSD.org/ for 19 * information about NetBSD. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 * 34 * --(license Id: LICENSE.proto,v 1.1 2000/06/13 21:40:26 cgd Exp )-- 35 */ 36 37 /* 38 * Copyright (c) 1992, 1993 39 * The Regents of the University of California. All rights reserved. 40 * 41 * This software was developed by the Computer Systems Engineering group 42 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 43 * contributed to Berkeley. 44 * 45 * All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Lawrence Berkeley Laboratories. 49 * 50 * Redistribution and use in source and binary forms, with or without 51 * modification, are permitted provided that the following conditions 52 * are met: 53 * 1. Redistributions of source code must retain the above copyright 54 * notice, this list of conditions and the following disclaimer. 55 * 2. Redistributions in binary form must reproduce the above copyright 56 * notice, this list of conditions and the following disclaimer in the 57 * documentation and/or other materials provided with the distribution. 58 * 3. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 * from: Header: subr_autoconf.c,v 1.12 93/02/01 19:31:48 torek Exp (LBL) 75 * 76 * @(#)subr_autoconf.c 8.3 (Berkeley) 5/17/94 77 */ 78 79 #include <sys/cdefs.h> 80 __KERNEL_RCSID(0, "$NetBSD: subr_autoconf.c,v 1.266 2020/02/20 21:14:23 jdolecek Exp $"); 81 82 #ifdef _KERNEL_OPT 83 #include "opt_ddb.h" 84 #include "drvctl.h" 85 #endif 86 87 #include <sys/param.h> 88 #include <sys/device.h> 89 #include <sys/disklabel.h> 90 #include <sys/conf.h> 91 #include <sys/kauth.h> 92 #include <sys/kmem.h> 93 #include <sys/systm.h> 94 #include <sys/kernel.h> 95 #include <sys/errno.h> 96 #include <sys/proc.h> 97 #include <sys/reboot.h> 98 #include <sys/kthread.h> 99 #include <sys/buf.h> 100 #include <sys/dirent.h> 101 #include <sys/mount.h> 102 #include <sys/namei.h> 103 #include <sys/unistd.h> 104 #include <sys/fcntl.h> 105 #include <sys/lockf.h> 106 #include <sys/callout.h> 107 #include <sys/devmon.h> 108 #include <sys/cpu.h> 109 #include <sys/sysctl.h> 110 111 #include <sys/disk.h> 112 113 #include <sys/rndsource.h> 114 115 #include <machine/limits.h> 116 117 /* 118 * Autoconfiguration subroutines. 119 */ 120 121 /* 122 * Device autoconfiguration timings are mixed into the entropy pool. 123 */ 124 extern krndsource_t rnd_autoconf_source; 125 126 /* 127 * ioconf.c exports exactly two names: cfdata and cfroots. All system 128 * devices and drivers are found via these tables. 129 */ 130 extern struct cfdata cfdata[]; 131 extern const short cfroots[]; 132 133 /* 134 * List of all cfdriver structures. We use this to detect duplicates 135 * when other cfdrivers are loaded. 136 */ 137 struct cfdriverlist allcfdrivers = LIST_HEAD_INITIALIZER(&allcfdrivers); 138 extern struct cfdriver * const cfdriver_list_initial[]; 139 140 /* 141 * Initial list of cfattach's. 142 */ 143 extern const struct cfattachinit cfattachinit[]; 144 145 /* 146 * List of cfdata tables. We always have one such list -- the one 147 * built statically when the kernel was configured. 148 */ 149 struct cftablelist allcftables = TAILQ_HEAD_INITIALIZER(allcftables); 150 static struct cftable initcftable; 151 152 #define ROOT ((device_t)NULL) 153 154 struct matchinfo { 155 cfsubmatch_t fn; 156 device_t parent; 157 const int *locs; 158 void *aux; 159 struct cfdata *match; 160 int pri; 161 }; 162 163 struct alldevs_foray { 164 int af_s; 165 struct devicelist af_garbage; 166 }; 167 168 static char *number(char *, int); 169 static void mapply(struct matchinfo *, cfdata_t); 170 static device_t config_devalloc(const device_t, const cfdata_t, const int *); 171 static void config_devdelete(device_t); 172 static void config_devunlink(device_t, struct devicelist *); 173 static void config_makeroom(int, struct cfdriver *); 174 static void config_devlink(device_t); 175 static void config_alldevs_enter(struct alldevs_foray *); 176 static void config_alldevs_exit(struct alldevs_foray *); 177 static void config_add_attrib_dict(device_t); 178 179 static void config_collect_garbage(struct devicelist *); 180 static void config_dump_garbage(struct devicelist *); 181 182 static void pmflock_debug(device_t, const char *, int); 183 184 static device_t deviter_next1(deviter_t *); 185 static void deviter_reinit(deviter_t *); 186 187 struct deferred_config { 188 TAILQ_ENTRY(deferred_config) dc_queue; 189 device_t dc_dev; 190 void (*dc_func)(device_t); 191 }; 192 193 TAILQ_HEAD(deferred_config_head, deferred_config); 194 195 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 int config_pending; /* semaphore for mountroot */ 228 static kmutex_t config_misc_lock; 229 static kcondvar_t config_misc_cv; 230 231 static bool detachall = false; 232 233 #define STREQ(s1, s2) \ 234 (*(s1) == *(s2) && strcmp((s1), (s2)) == 0) 235 236 static bool config_initialized = false; /* config_init() has been called. */ 237 238 static int config_do_twiddle; 239 static callout_t config_twiddle_ch; 240 241 static void sysctl_detach_setup(struct sysctllog **); 242 243 int no_devmon_insert(const char *, prop_dictionary_t); 244 int (*devmon_insert_vec)(const char *, prop_dictionary_t) = no_devmon_insert; 245 246 typedef int (*cfdriver_fn)(struct cfdriver *); 247 static int 248 frob_cfdrivervec(struct cfdriver * const *cfdriverv, 249 cfdriver_fn drv_do, cfdriver_fn drv_undo, 250 const char *style, bool dopanic) 251 { 252 void (*pr)(const char *, ...) __printflike(1, 2) = 253 dopanic ? panic : printf; 254 int i, error = 0, e2 __diagused; 255 256 for (i = 0; cfdriverv[i] != NULL; i++) { 257 if ((error = drv_do(cfdriverv[i])) != 0) { 258 pr("configure: `%s' driver %s failed: %d", 259 cfdriverv[i]->cd_name, style, error); 260 goto bad; 261 } 262 } 263 264 KASSERT(error == 0); 265 return 0; 266 267 bad: 268 printf("\n"); 269 for (i--; i >= 0; i--) { 270 e2 = drv_undo(cfdriverv[i]); 271 KASSERT(e2 == 0); 272 } 273 274 return error; 275 } 276 277 typedef int (*cfattach_fn)(const char *, struct cfattach *); 278 static int 279 frob_cfattachvec(const struct cfattachinit *cfattachv, 280 cfattach_fn att_do, cfattach_fn att_undo, 281 const char *style, bool dopanic) 282 { 283 const struct cfattachinit *cfai = NULL; 284 void (*pr)(const char *, ...) __printflike(1, 2) = 285 dopanic ? panic : printf; 286 int j = 0, error = 0, e2 __diagused; 287 288 for (cfai = &cfattachv[0]; cfai->cfai_name != NULL; cfai++) { 289 for (j = 0; cfai->cfai_list[j] != NULL; j++) { 290 if ((error = att_do(cfai->cfai_name, 291 cfai->cfai_list[j])) != 0) { 292 pr("configure: attachment `%s' " 293 "of `%s' driver %s failed: %d", 294 cfai->cfai_list[j]->ca_name, 295 cfai->cfai_name, style, error); 296 goto bad; 297 } 298 } 299 } 300 301 KASSERT(error == 0); 302 return 0; 303 304 bad: 305 /* 306 * Rollback in reverse order. dunno if super-important, but 307 * do that anyway. Although the code looks a little like 308 * someone did a little integration (in the math sense). 309 */ 310 printf("\n"); 311 if (cfai) { 312 bool last; 313 314 for (last = false; last == false; ) { 315 if (cfai == &cfattachv[0]) 316 last = true; 317 for (j--; j >= 0; j--) { 318 e2 = att_undo(cfai->cfai_name, 319 cfai->cfai_list[j]); 320 KASSERT(e2 == 0); 321 } 322 if (!last) { 323 cfai--; 324 for (j = 0; cfai->cfai_list[j] != NULL; j++) 325 ; 326 } 327 } 328 } 329 330 return error; 331 } 332 333 /* 334 * Initialize the autoconfiguration data structures. Normally this 335 * is done by configure(), but some platforms need to do this very 336 * early (to e.g. initialize the console). 337 */ 338 void 339 config_init(void) 340 { 341 342 KASSERT(config_initialized == false); 343 344 mutex_init(&alldevs_lock, MUTEX_DEFAULT, IPL_VM); 345 346 mutex_init(&config_misc_lock, MUTEX_DEFAULT, IPL_NONE); 347 cv_init(&config_misc_cv, "cfgmisc"); 348 349 callout_init(&config_twiddle_ch, CALLOUT_MPSAFE); 350 351 frob_cfdrivervec(cfdriver_list_initial, 352 config_cfdriver_attach, NULL, "bootstrap", true); 353 frob_cfattachvec(cfattachinit, 354 config_cfattach_attach, NULL, "bootstrap", true); 355 356 initcftable.ct_cfdata = cfdata; 357 TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list); 358 359 config_initialized = true; 360 } 361 362 /* 363 * Init or fini drivers and attachments. Either all or none 364 * are processed (via rollback). It would be nice if this were 365 * atomic to outside consumers, but with the current state of 366 * locking ... 367 */ 368 int 369 config_init_component(struct cfdriver * const *cfdriverv, 370 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 371 { 372 int error; 373 374 if ((error = frob_cfdrivervec(cfdriverv, 375 config_cfdriver_attach, config_cfdriver_detach, "init", false))!= 0) 376 return error; 377 if ((error = frob_cfattachvec(cfattachv, 378 config_cfattach_attach, config_cfattach_detach, 379 "init", false)) != 0) { 380 frob_cfdrivervec(cfdriverv, 381 config_cfdriver_detach, NULL, "init rollback", true); 382 return error; 383 } 384 if ((error = config_cfdata_attach(cfdatav, 1)) != 0) { 385 frob_cfattachvec(cfattachv, 386 config_cfattach_detach, NULL, "init rollback", true); 387 frob_cfdrivervec(cfdriverv, 388 config_cfdriver_detach, NULL, "init rollback", true); 389 return error; 390 } 391 392 return 0; 393 } 394 395 int 396 config_fini_component(struct cfdriver * const *cfdriverv, 397 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 398 { 399 int error; 400 401 if ((error = config_cfdata_detach(cfdatav)) != 0) 402 return error; 403 if ((error = frob_cfattachvec(cfattachv, 404 config_cfattach_detach, config_cfattach_attach, 405 "fini", false)) != 0) { 406 if (config_cfdata_attach(cfdatav, 0) != 0) 407 panic("config_cfdata fini rollback failed"); 408 return error; 409 } 410 if ((error = frob_cfdrivervec(cfdriverv, 411 config_cfdriver_detach, config_cfdriver_attach, 412 "fini", false)) != 0) { 413 frob_cfattachvec(cfattachv, 414 config_cfattach_attach, NULL, "fini rollback", true); 415 if (config_cfdata_attach(cfdatav, 0) != 0) 416 panic("config_cfdata fini rollback failed"); 417 return error; 418 } 419 420 return 0; 421 } 422 423 void 424 config_init_mi(void) 425 { 426 427 if (!config_initialized) 428 config_init(); 429 430 sysctl_detach_setup(NULL); 431 } 432 433 void 434 config_deferred(device_t dev) 435 { 436 config_process_deferred(&deferred_config_queue, dev); 437 config_process_deferred(&interrupt_config_queue, dev); 438 config_process_deferred(&mountroot_config_queue, dev); 439 } 440 441 static void 442 config_interrupts_thread(void *cookie) 443 { 444 struct deferred_config *dc; 445 446 mutex_enter(&config_misc_lock); 447 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 448 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 449 mutex_exit(&config_misc_lock); 450 451 (*dc->dc_func)(dc->dc_dev); 452 if (!device_pmf_is_registered(dc->dc_dev)) 453 aprint_debug_dev(dc->dc_dev, 454 "WARNING: power management not supported\n"); 455 config_pending_decr(dc->dc_dev); 456 kmem_free(dc, sizeof(*dc)); 457 458 mutex_enter(&config_misc_lock); 459 dc->dc_dev->dv_flags &= ~DVF_ATTACH_INPROGRESS; 460 } 461 mutex_exit(&config_misc_lock); 462 463 kthread_exit(0); 464 } 465 466 void 467 config_create_interruptthreads(void) 468 { 469 int i; 470 471 for (i = 0; i < interrupt_config_threads; i++) { 472 (void)kthread_create(PRI_NONE, 0/*XXXSMP */, NULL, 473 config_interrupts_thread, NULL, NULL, "configintr"); 474 } 475 } 476 477 static void 478 config_mountroot_thread(void *cookie) 479 { 480 struct deferred_config *dc; 481 482 mutex_enter(&config_misc_lock); 483 while ((dc = TAILQ_FIRST(&mountroot_config_queue)) != NULL) { 484 TAILQ_REMOVE(&mountroot_config_queue, dc, dc_queue); 485 mutex_exit(&config_misc_lock); 486 487 (*dc->dc_func)(dc->dc_dev); 488 kmem_free(dc, sizeof(*dc)); 489 490 mutex_enter(&config_misc_lock); 491 } 492 mutex_exit(&config_misc_lock); 493 494 kthread_exit(0); 495 } 496 497 void 498 config_create_mountrootthreads(void) 499 { 500 int i; 501 502 if (!root_is_mounted) 503 root_is_mounted = true; 504 505 mountroot_config_lwpids_size = sizeof(mountroot_config_lwpids) * 506 mountroot_config_threads; 507 mountroot_config_lwpids = kmem_alloc(mountroot_config_lwpids_size, 508 KM_NOSLEEP); 509 KASSERT(mountroot_config_lwpids); 510 for (i = 0; i < mountroot_config_threads; i++) { 511 mountroot_config_lwpids[i] = 0; 512 (void)kthread_create(PRI_NONE, KTHREAD_MUSTJOIN/* XXXSMP */, 513 NULL, config_mountroot_thread, NULL, 514 &mountroot_config_lwpids[i], 515 "configroot"); 516 } 517 } 518 519 void 520 config_finalize_mountroot(void) 521 { 522 int i, error; 523 524 for (i = 0; i < mountroot_config_threads; i++) { 525 if (mountroot_config_lwpids[i] == 0) 526 continue; 527 528 error = kthread_join(mountroot_config_lwpids[i]); 529 if (error) 530 printf("%s: thread %x joined with error %d\n", 531 __func__, i, error); 532 } 533 kmem_free(mountroot_config_lwpids, mountroot_config_lwpids_size); 534 } 535 536 /* 537 * Announce device attach/detach to userland listeners. 538 */ 539 540 int 541 no_devmon_insert(const char *name, prop_dictionary_t p) 542 { 543 544 return ENODEV; 545 } 546 547 static void 548 devmon_report_device(device_t dev, bool isattach) 549 { 550 prop_dictionary_t ev; 551 const char *parent; 552 const char *what; 553 device_t pdev = device_parent(dev); 554 555 /* If currently no drvctl device, just return */ 556 if (devmon_insert_vec == no_devmon_insert) 557 return; 558 559 ev = prop_dictionary_create(); 560 if (ev == NULL) 561 return; 562 563 what = (isattach ? "device-attach" : "device-detach"); 564 parent = (pdev == NULL ? "root" : device_xname(pdev)); 565 if (!prop_dictionary_set_cstring(ev, "device", device_xname(dev)) || 566 !prop_dictionary_set_cstring(ev, "parent", parent)) { 567 prop_object_release(ev); 568 return; 569 } 570 571 if ((*devmon_insert_vec)(what, ev) != 0) 572 prop_object_release(ev); 573 } 574 575 /* 576 * Add a cfdriver to the system. 577 */ 578 int 579 config_cfdriver_attach(struct cfdriver *cd) 580 { 581 struct cfdriver *lcd; 582 583 /* Make sure this driver isn't already in the system. */ 584 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 585 if (STREQ(lcd->cd_name, cd->cd_name)) 586 return EEXIST; 587 } 588 589 LIST_INIT(&cd->cd_attach); 590 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 591 592 return 0; 593 } 594 595 /* 596 * Remove a cfdriver from the system. 597 */ 598 int 599 config_cfdriver_detach(struct cfdriver *cd) 600 { 601 struct alldevs_foray af; 602 int i, rc = 0; 603 604 config_alldevs_enter(&af); 605 /* Make sure there are no active instances. */ 606 for (i = 0; i < cd->cd_ndevs; i++) { 607 if (cd->cd_devs[i] != NULL) { 608 rc = EBUSY; 609 break; 610 } 611 } 612 config_alldevs_exit(&af); 613 614 if (rc != 0) 615 return rc; 616 617 /* ...and no attachments loaded. */ 618 if (LIST_EMPTY(&cd->cd_attach) == 0) 619 return EBUSY; 620 621 LIST_REMOVE(cd, cd_list); 622 623 KASSERT(cd->cd_devs == NULL); 624 625 return 0; 626 } 627 628 /* 629 * Look up a cfdriver by name. 630 */ 631 struct cfdriver * 632 config_cfdriver_lookup(const char *name) 633 { 634 struct cfdriver *cd; 635 636 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 637 if (STREQ(cd->cd_name, name)) 638 return cd; 639 } 640 641 return NULL; 642 } 643 644 /* 645 * Add a cfattach to the specified driver. 646 */ 647 int 648 config_cfattach_attach(const char *driver, struct cfattach *ca) 649 { 650 struct cfattach *lca; 651 struct cfdriver *cd; 652 653 cd = config_cfdriver_lookup(driver); 654 if (cd == NULL) 655 return ESRCH; 656 657 /* Make sure this attachment isn't already on this driver. */ 658 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 659 if (STREQ(lca->ca_name, ca->ca_name)) 660 return EEXIST; 661 } 662 663 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 664 665 return 0; 666 } 667 668 /* 669 * Remove a cfattach from the specified driver. 670 */ 671 int 672 config_cfattach_detach(const char *driver, struct cfattach *ca) 673 { 674 struct alldevs_foray af; 675 struct cfdriver *cd; 676 device_t dev; 677 int i, rc = 0; 678 679 cd = config_cfdriver_lookup(driver); 680 if (cd == NULL) 681 return ESRCH; 682 683 config_alldevs_enter(&af); 684 /* Make sure there are no active instances. */ 685 for (i = 0; i < cd->cd_ndevs; i++) { 686 if ((dev = cd->cd_devs[i]) == NULL) 687 continue; 688 if (dev->dv_cfattach == ca) { 689 rc = EBUSY; 690 break; 691 } 692 } 693 config_alldevs_exit(&af); 694 695 if (rc != 0) 696 return rc; 697 698 LIST_REMOVE(ca, ca_list); 699 700 return 0; 701 } 702 703 /* 704 * Look up a cfattach by name. 705 */ 706 static struct cfattach * 707 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 708 { 709 struct cfattach *ca; 710 711 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 712 if (STREQ(ca->ca_name, atname)) 713 return ca; 714 } 715 716 return NULL; 717 } 718 719 /* 720 * Look up a cfattach by driver/attachment name. 721 */ 722 struct cfattach * 723 config_cfattach_lookup(const char *name, const char *atname) 724 { 725 struct cfdriver *cd; 726 727 cd = config_cfdriver_lookup(name); 728 if (cd == NULL) 729 return NULL; 730 731 return config_cfattach_lookup_cd(cd, atname); 732 } 733 734 /* 735 * Apply the matching function and choose the best. This is used 736 * a few times and we want to keep the code small. 737 */ 738 static void 739 mapply(struct matchinfo *m, cfdata_t cf) 740 { 741 int pri; 742 743 if (m->fn != NULL) { 744 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 745 } else { 746 pri = config_match(m->parent, cf, m->aux); 747 } 748 if (pri > m->pri) { 749 m->match = cf; 750 m->pri = pri; 751 } 752 } 753 754 int 755 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 756 { 757 const struct cfiattrdata *ci; 758 const struct cflocdesc *cl; 759 int nlocs, i; 760 761 ci = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 762 KASSERT(ci); 763 nlocs = ci->ci_loclen; 764 KASSERT(!nlocs || locs); 765 for (i = 0; i < nlocs; i++) { 766 cl = &ci->ci_locdesc[i]; 767 if (cl->cld_defaultstr != NULL && 768 cf->cf_loc[i] == cl->cld_default) 769 continue; 770 if (cf->cf_loc[i] == locs[i]) 771 continue; 772 return 0; 773 } 774 775 return config_match(parent, cf, aux); 776 } 777 778 /* 779 * Helper function: check whether the driver supports the interface attribute 780 * and return its descriptor structure. 781 */ 782 static const struct cfiattrdata * 783 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 784 { 785 const struct cfiattrdata * const *cpp; 786 787 if (cd->cd_attrs == NULL) 788 return 0; 789 790 for (cpp = cd->cd_attrs; *cpp; cpp++) { 791 if (STREQ((*cpp)->ci_name, ia)) { 792 /* Match. */ 793 return *cpp; 794 } 795 } 796 return 0; 797 } 798 799 /* 800 * Lookup an interface attribute description by name. 801 * If the driver is given, consider only its supported attributes. 802 */ 803 const struct cfiattrdata * 804 cfiattr_lookup(const char *name, const struct cfdriver *cd) 805 { 806 const struct cfdriver *d; 807 const struct cfiattrdata *ia; 808 809 if (cd) 810 return cfdriver_get_iattr(cd, name); 811 812 LIST_FOREACH(d, &allcfdrivers, cd_list) { 813 ia = cfdriver_get_iattr(d, name); 814 if (ia) 815 return ia; 816 } 817 return 0; 818 } 819 820 /* 821 * Determine if `parent' is a potential parent for a device spec based 822 * on `cfp'. 823 */ 824 static int 825 cfparent_match(const device_t parent, const struct cfparent *cfp) 826 { 827 struct cfdriver *pcd; 828 829 /* We don't match root nodes here. */ 830 if (cfp == NULL) 831 return 0; 832 833 pcd = parent->dv_cfdriver; 834 KASSERT(pcd != NULL); 835 836 /* 837 * First, ensure this parent has the correct interface 838 * attribute. 839 */ 840 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 841 return 0; 842 843 /* 844 * If no specific parent device instance was specified (i.e. 845 * we're attaching to the attribute only), we're done! 846 */ 847 if (cfp->cfp_parent == NULL) 848 return 1; 849 850 /* 851 * Check the parent device's name. 852 */ 853 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 854 return 0; /* not the same parent */ 855 856 /* 857 * Make sure the unit number matches. 858 */ 859 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 860 cfp->cfp_unit == parent->dv_unit) 861 return 1; 862 863 /* Unit numbers don't match. */ 864 return 0; 865 } 866 867 /* 868 * Helper for config_cfdata_attach(): check all devices whether it could be 869 * parent any attachment in the config data table passed, and rescan. 870 */ 871 static void 872 rescan_with_cfdata(const struct cfdata *cf) 873 { 874 device_t d; 875 const struct cfdata *cf1; 876 deviter_t di; 877 878 879 /* 880 * "alldevs" is likely longer than a modules's cfdata, so make it 881 * the outer loop. 882 */ 883 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 884 885 if (!(d->dv_cfattach->ca_rescan)) 886 continue; 887 888 for (cf1 = cf; cf1->cf_name; cf1++) { 889 890 if (!cfparent_match(d, cf1->cf_pspec)) 891 continue; 892 893 (*d->dv_cfattach->ca_rescan)(d, 894 cfdata_ifattr(cf1), cf1->cf_loc); 895 896 config_deferred(d); 897 } 898 } 899 deviter_release(&di); 900 } 901 902 /* 903 * Attach a supplemental config data table and rescan potential 904 * parent devices if required. 905 */ 906 int 907 config_cfdata_attach(cfdata_t cf, int scannow) 908 { 909 struct cftable *ct; 910 911 ct = kmem_alloc(sizeof(*ct), KM_SLEEP); 912 ct->ct_cfdata = cf; 913 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 914 915 if (scannow) 916 rescan_with_cfdata(cf); 917 918 return 0; 919 } 920 921 /* 922 * Helper for config_cfdata_detach: check whether a device is 923 * found through any attachment in the config data table. 924 */ 925 static int 926 dev_in_cfdata(device_t d, cfdata_t cf) 927 { 928 const struct cfdata *cf1; 929 930 for (cf1 = cf; cf1->cf_name; cf1++) 931 if (d->dv_cfdata == cf1) 932 return 1; 933 934 return 0; 935 } 936 937 /* 938 * Detach a supplemental config data table. Detach all devices found 939 * through that table (and thus keeping references to it) before. 940 */ 941 int 942 config_cfdata_detach(cfdata_t cf) 943 { 944 device_t d; 945 int error = 0; 946 struct cftable *ct; 947 deviter_t di; 948 949 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 950 d = deviter_next(&di)) { 951 if (!dev_in_cfdata(d, cf)) 952 continue; 953 if ((error = config_detach(d, 0)) != 0) 954 break; 955 } 956 deviter_release(&di); 957 if (error) { 958 aprint_error_dev(d, "unable to detach instance\n"); 959 return error; 960 } 961 962 TAILQ_FOREACH(ct, &allcftables, ct_list) { 963 if (ct->ct_cfdata == cf) { 964 TAILQ_REMOVE(&allcftables, ct, ct_list); 965 kmem_free(ct, sizeof(*ct)); 966 return 0; 967 } 968 } 969 970 /* not found -- shouldn't happen */ 971 return EINVAL; 972 } 973 974 /* 975 * Invoke the "match" routine for a cfdata entry on behalf of 976 * an external caller, usually a "submatch" routine. 977 */ 978 int 979 config_match(device_t parent, cfdata_t cf, void *aux) 980 { 981 struct cfattach *ca; 982 983 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 984 if (ca == NULL) { 985 /* No attachment for this entry, oh well. */ 986 return 0; 987 } 988 989 return (*ca->ca_match)(parent, cf, aux); 990 } 991 992 /* 993 * Iterate over all potential children of some device, calling the given 994 * function (default being the child's match function) for each one. 995 * Nonzero returns are matches; the highest value returned is considered 996 * the best match. Return the `found child' if we got a match, or NULL 997 * otherwise. The `aux' pointer is simply passed on through. 998 * 999 * Note that this function is designed so that it can be used to apply 1000 * an arbitrary function to all potential children (its return value 1001 * can be ignored). 1002 */ 1003 cfdata_t 1004 config_search_loc(cfsubmatch_t fn, device_t parent, 1005 const char *ifattr, const int *locs, void *aux) 1006 { 1007 struct cftable *ct; 1008 cfdata_t cf; 1009 struct matchinfo m; 1010 1011 KASSERT(config_initialized); 1012 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 1013 1014 m.fn = fn; 1015 m.parent = parent; 1016 m.locs = locs; 1017 m.aux = aux; 1018 m.match = NULL; 1019 m.pri = 0; 1020 1021 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1022 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1023 1024 /* We don't match root nodes here. */ 1025 if (!cf->cf_pspec) 1026 continue; 1027 1028 /* 1029 * Skip cf if no longer eligible, otherwise scan 1030 * through parents for one matching `parent', and 1031 * try match function. 1032 */ 1033 if (cf->cf_fstate == FSTATE_FOUND) 1034 continue; 1035 if (cf->cf_fstate == FSTATE_DNOTFOUND || 1036 cf->cf_fstate == FSTATE_DSTAR) 1037 continue; 1038 1039 /* 1040 * If an interface attribute was specified, 1041 * consider only children which attach to 1042 * that attribute. 1043 */ 1044 if (ifattr && !STREQ(ifattr, cfdata_ifattr(cf))) 1045 continue; 1046 1047 if (cfparent_match(parent, cf->cf_pspec)) 1048 mapply(&m, cf); 1049 } 1050 } 1051 return m.match; 1052 } 1053 1054 cfdata_t 1055 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 1056 void *aux) 1057 { 1058 1059 return config_search_loc(fn, parent, ifattr, NULL, aux); 1060 } 1061 1062 /* 1063 * Find the given root device. 1064 * This is much like config_search, but there is no parent. 1065 * Don't bother with multiple cfdata tables; the root node 1066 * must always be in the initial table. 1067 */ 1068 cfdata_t 1069 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 1070 { 1071 cfdata_t cf; 1072 const short *p; 1073 struct matchinfo m; 1074 1075 m.fn = fn; 1076 m.parent = ROOT; 1077 m.aux = aux; 1078 m.match = NULL; 1079 m.pri = 0; 1080 m.locs = 0; 1081 /* 1082 * Look at root entries for matching name. We do not bother 1083 * with found-state here since only one root should ever be 1084 * searched (and it must be done first). 1085 */ 1086 for (p = cfroots; *p >= 0; p++) { 1087 cf = &cfdata[*p]; 1088 if (strcmp(cf->cf_name, rootname) == 0) 1089 mapply(&m, cf); 1090 } 1091 return m.match; 1092 } 1093 1094 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 1095 1096 /* 1097 * The given `aux' argument describes a device that has been found 1098 * on the given parent, but not necessarily configured. Locate the 1099 * configuration data for that device (using the submatch function 1100 * provided, or using candidates' cd_match configuration driver 1101 * functions) and attach it, and return its device_t. If the device was 1102 * not configured, call the given `print' function and return NULL. 1103 */ 1104 device_t 1105 config_found_sm_loc(device_t parent, 1106 const char *ifattr, const int *locs, void *aux, 1107 cfprint_t print, cfsubmatch_t submatch) 1108 { 1109 cfdata_t cf; 1110 1111 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 1112 return(config_attach_loc(parent, cf, locs, aux, print)); 1113 if (print) { 1114 if (config_do_twiddle && cold) 1115 twiddle(); 1116 aprint_normal("%s", msgs[(*print)(aux, device_xname(parent))]); 1117 } 1118 1119 /* 1120 * This has the effect of mixing in a single timestamp to the 1121 * entropy pool. Experiments indicate the estimator will almost 1122 * always attribute one bit of entropy to this sample; analysis 1123 * of device attach/detach timestamps on FreeBSD indicates 4 1124 * bits of entropy/sample so this seems appropriately conservative. 1125 */ 1126 rnd_add_uint32(&rnd_autoconf_source, 0); 1127 return NULL; 1128 } 1129 1130 device_t 1131 config_found_ia(device_t parent, const char *ifattr, void *aux, 1132 cfprint_t print) 1133 { 1134 1135 return config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL); 1136 } 1137 1138 device_t 1139 config_found(device_t parent, void *aux, cfprint_t print) 1140 { 1141 1142 return config_found_sm_loc(parent, NULL, NULL, aux, print, NULL); 1143 } 1144 1145 /* 1146 * As above, but for root devices. 1147 */ 1148 device_t 1149 config_rootfound(const char *rootname, void *aux) 1150 { 1151 cfdata_t cf; 1152 1153 if ((cf = config_rootsearch(NULL, rootname, aux)) != NULL) 1154 return config_attach(ROOT, cf, aux, NULL); 1155 aprint_error("root device %s not configured\n", rootname); 1156 return NULL; 1157 } 1158 1159 /* just like sprintf(buf, "%d") except that it works from the end */ 1160 static char * 1161 number(char *ep, int n) 1162 { 1163 1164 *--ep = 0; 1165 while (n >= 10) { 1166 *--ep = (n % 10) + '0'; 1167 n /= 10; 1168 } 1169 *--ep = n + '0'; 1170 return ep; 1171 } 1172 1173 /* 1174 * Expand the size of the cd_devs array if necessary. 1175 * 1176 * The caller must hold alldevs_lock. config_makeroom() may release and 1177 * re-acquire alldevs_lock, so callers should re-check conditions such 1178 * as alldevs_nwrite == 0 and alldevs_nread == 0 when config_makeroom() 1179 * returns. 1180 */ 1181 static void 1182 config_makeroom(int n, struct cfdriver *cd) 1183 { 1184 int ondevs, nndevs; 1185 device_t *osp, *nsp; 1186 1187 KASSERT(mutex_owned(&alldevs_lock)); 1188 alldevs_nwrite++; 1189 1190 for (nndevs = MAX(4, cd->cd_ndevs); nndevs <= n; nndevs += nndevs) 1191 ; 1192 1193 while (n >= cd->cd_ndevs) { 1194 /* 1195 * Need to expand the array. 1196 */ 1197 ondevs = cd->cd_ndevs; 1198 osp = cd->cd_devs; 1199 1200 /* 1201 * Release alldevs_lock around allocation, which may 1202 * sleep. 1203 */ 1204 mutex_exit(&alldevs_lock); 1205 nsp = kmem_alloc(sizeof(device_t[nndevs]), KM_SLEEP); 1206 mutex_enter(&alldevs_lock); 1207 1208 /* 1209 * If another thread moved the array while we did 1210 * not hold alldevs_lock, try again. 1211 */ 1212 if (cd->cd_devs != osp) { 1213 mutex_exit(&alldevs_lock); 1214 kmem_free(nsp, sizeof(device_t[nndevs])); 1215 mutex_enter(&alldevs_lock); 1216 continue; 1217 } 1218 1219 memset(nsp + ondevs, 0, sizeof(device_t[nndevs - ondevs])); 1220 if (ondevs != 0) 1221 memcpy(nsp, cd->cd_devs, sizeof(device_t[ondevs])); 1222 1223 cd->cd_ndevs = nndevs; 1224 cd->cd_devs = nsp; 1225 if (ondevs != 0) { 1226 mutex_exit(&alldevs_lock); 1227 kmem_free(osp, sizeof(device_t[ondevs])); 1228 mutex_enter(&alldevs_lock); 1229 } 1230 } 1231 KASSERT(mutex_owned(&alldevs_lock)); 1232 alldevs_nwrite--; 1233 } 1234 1235 /* 1236 * Put dev into the devices list. 1237 */ 1238 static void 1239 config_devlink(device_t dev) 1240 { 1241 1242 mutex_enter(&alldevs_lock); 1243 1244 KASSERT(device_cfdriver(dev)->cd_devs[dev->dv_unit] == dev); 1245 1246 dev->dv_add_gen = alldevs_gen; 1247 /* It is safe to add a device to the tail of the list while 1248 * readers and writers are in the list. 1249 */ 1250 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); 1251 mutex_exit(&alldevs_lock); 1252 } 1253 1254 static void 1255 config_devfree(device_t dev) 1256 { 1257 int priv = (dev->dv_flags & DVF_PRIV_ALLOC); 1258 1259 if (dev->dv_cfattach->ca_devsize > 0) 1260 kmem_free(dev->dv_private, dev->dv_cfattach->ca_devsize); 1261 if (priv) 1262 kmem_free(dev, sizeof(*dev)); 1263 } 1264 1265 /* 1266 * Caller must hold alldevs_lock. 1267 */ 1268 static void 1269 config_devunlink(device_t dev, struct devicelist *garbage) 1270 { 1271 struct device_garbage *dg = &dev->dv_garbage; 1272 cfdriver_t cd = device_cfdriver(dev); 1273 int i; 1274 1275 KASSERT(mutex_owned(&alldevs_lock)); 1276 1277 /* Unlink from device list. Link to garbage list. */ 1278 TAILQ_REMOVE(&alldevs, dev, dv_list); 1279 TAILQ_INSERT_TAIL(garbage, dev, dv_list); 1280 1281 /* Remove from cfdriver's array. */ 1282 cd->cd_devs[dev->dv_unit] = NULL; 1283 1284 /* 1285 * If the device now has no units in use, unlink its softc array. 1286 */ 1287 for (i = 0; i < cd->cd_ndevs; i++) { 1288 if (cd->cd_devs[i] != NULL) 1289 break; 1290 } 1291 /* Nothing found. Unlink, now. Deallocate, later. */ 1292 if (i == cd->cd_ndevs) { 1293 dg->dg_ndevs = cd->cd_ndevs; 1294 dg->dg_devs = cd->cd_devs; 1295 cd->cd_devs = NULL; 1296 cd->cd_ndevs = 0; 1297 } 1298 } 1299 1300 static void 1301 config_devdelete(device_t dev) 1302 { 1303 struct device_garbage *dg = &dev->dv_garbage; 1304 device_lock_t dvl = device_getlock(dev); 1305 1306 if (dg->dg_devs != NULL) 1307 kmem_free(dg->dg_devs, sizeof(device_t[dg->dg_ndevs])); 1308 1309 cv_destroy(&dvl->dvl_cv); 1310 mutex_destroy(&dvl->dvl_mtx); 1311 1312 KASSERT(dev->dv_properties != NULL); 1313 prop_object_release(dev->dv_properties); 1314 1315 if (dev->dv_activity_handlers) 1316 panic("%s with registered handlers", __func__); 1317 1318 if (dev->dv_locators) { 1319 size_t amount = *--dev->dv_locators; 1320 kmem_free(dev->dv_locators, amount); 1321 } 1322 1323 config_devfree(dev); 1324 } 1325 1326 static int 1327 config_unit_nextfree(cfdriver_t cd, cfdata_t cf) 1328 { 1329 int unit; 1330 1331 if (cf->cf_fstate == FSTATE_STAR) { 1332 for (unit = cf->cf_unit; unit < cd->cd_ndevs; unit++) 1333 if (cd->cd_devs[unit] == NULL) 1334 break; 1335 /* 1336 * unit is now the unit of the first NULL device pointer, 1337 * or max(cd->cd_ndevs,cf->cf_unit). 1338 */ 1339 } else { 1340 unit = cf->cf_unit; 1341 if (unit < cd->cd_ndevs && cd->cd_devs[unit] != NULL) 1342 unit = -1; 1343 } 1344 return unit; 1345 } 1346 1347 static int 1348 config_unit_alloc(device_t dev, cfdriver_t cd, cfdata_t cf) 1349 { 1350 struct alldevs_foray af; 1351 int unit; 1352 1353 config_alldevs_enter(&af); 1354 for (;;) { 1355 unit = config_unit_nextfree(cd, cf); 1356 if (unit == -1) 1357 break; 1358 if (unit < cd->cd_ndevs) { 1359 cd->cd_devs[unit] = dev; 1360 dev->dv_unit = unit; 1361 break; 1362 } 1363 config_makeroom(unit, cd); 1364 } 1365 config_alldevs_exit(&af); 1366 1367 return unit; 1368 } 1369 1370 static device_t 1371 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1372 { 1373 cfdriver_t cd; 1374 cfattach_t ca; 1375 size_t lname, lunit; 1376 const char *xunit; 1377 int myunit; 1378 char num[10]; 1379 device_t dev; 1380 void *dev_private; 1381 const struct cfiattrdata *ia; 1382 device_lock_t dvl; 1383 1384 cd = config_cfdriver_lookup(cf->cf_name); 1385 if (cd == NULL) 1386 return NULL; 1387 1388 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1389 if (ca == NULL) 1390 return NULL; 1391 1392 /* get memory for all device vars */ 1393 KASSERTMSG((ca->ca_flags & DVF_PRIV_ALLOC) 1394 || ca->ca_devsize >= sizeof(struct device), 1395 "%s: %s (%zu < %zu)", __func__, cf->cf_atname, ca->ca_devsize, 1396 sizeof(struct device)); 1397 if (ca->ca_devsize > 0) { 1398 dev_private = kmem_zalloc(ca->ca_devsize, KM_SLEEP); 1399 } else { 1400 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1401 dev_private = NULL; 1402 } 1403 1404 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1405 dev = kmem_zalloc(sizeof(*dev), KM_SLEEP); 1406 } else { 1407 dev = dev_private; 1408 #ifdef DIAGNOSTIC 1409 printf("%s has not been converted to device_t\n", cd->cd_name); 1410 #endif 1411 KASSERT(dev != NULL); 1412 } 1413 dev->dv_class = cd->cd_class; 1414 dev->dv_cfdata = cf; 1415 dev->dv_cfdriver = cd; 1416 dev->dv_cfattach = ca; 1417 dev->dv_activity_count = 0; 1418 dev->dv_activity_handlers = NULL; 1419 dev->dv_private = dev_private; 1420 dev->dv_flags = ca->ca_flags; /* inherit flags from class */ 1421 1422 myunit = config_unit_alloc(dev, cd, cf); 1423 if (myunit == -1) { 1424 config_devfree(dev); 1425 return NULL; 1426 } 1427 1428 /* compute length of name and decimal expansion of unit number */ 1429 lname = strlen(cd->cd_name); 1430 xunit = number(&num[sizeof(num)], myunit); 1431 lunit = &num[sizeof(num)] - xunit; 1432 if (lname + lunit > sizeof(dev->dv_xname)) 1433 panic("config_devalloc: device name too long"); 1434 1435 dvl = device_getlock(dev); 1436 1437 mutex_init(&dvl->dvl_mtx, MUTEX_DEFAULT, IPL_NONE); 1438 cv_init(&dvl->dvl_cv, "pmfsusp"); 1439 1440 memcpy(dev->dv_xname, cd->cd_name, lname); 1441 memcpy(dev->dv_xname + lname, xunit, lunit); 1442 dev->dv_parent = parent; 1443 if (parent != NULL) 1444 dev->dv_depth = parent->dv_depth + 1; 1445 else 1446 dev->dv_depth = 0; 1447 dev->dv_flags |= DVF_ACTIVE; /* always initially active */ 1448 if (locs) { 1449 KASSERT(parent); /* no locators at root */ 1450 ia = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 1451 dev->dv_locators = 1452 kmem_alloc(sizeof(int [ia->ci_loclen + 1]), KM_SLEEP); 1453 *dev->dv_locators++ = sizeof(int [ia->ci_loclen + 1]); 1454 memcpy(dev->dv_locators, locs, sizeof(int [ia->ci_loclen])); 1455 } 1456 dev->dv_properties = prop_dictionary_create(); 1457 KASSERT(dev->dv_properties != NULL); 1458 1459 prop_dictionary_set_cstring_nocopy(dev->dv_properties, 1460 "device-driver", dev->dv_cfdriver->cd_name); 1461 prop_dictionary_set_uint16(dev->dv_properties, 1462 "device-unit", dev->dv_unit); 1463 if (parent != NULL) { 1464 prop_dictionary_set_cstring(dev->dv_properties, 1465 "device-parent", device_xname(parent)); 1466 } 1467 1468 if (dev->dv_cfdriver->cd_attrs != NULL) 1469 config_add_attrib_dict(dev); 1470 1471 return dev; 1472 } 1473 1474 /* 1475 * Create an array of device attach attributes and add it 1476 * to the device's dv_properties dictionary. 1477 * 1478 * <key>interface-attributes</key> 1479 * <array> 1480 * <dict> 1481 * <key>attribute-name</key> 1482 * <string>foo</string> 1483 * <key>locators</key> 1484 * <array> 1485 * <dict> 1486 * <key>loc-name</key> 1487 * <string>foo-loc1</string> 1488 * </dict> 1489 * <dict> 1490 * <key>loc-name</key> 1491 * <string>foo-loc2</string> 1492 * <key>default</key> 1493 * <string>foo-loc2-default</string> 1494 * </dict> 1495 * ... 1496 * </array> 1497 * </dict> 1498 * ... 1499 * </array> 1500 */ 1501 1502 static void 1503 config_add_attrib_dict(device_t dev) 1504 { 1505 int i, j; 1506 const struct cfiattrdata *ci; 1507 prop_dictionary_t attr_dict, loc_dict; 1508 prop_array_t attr_array, loc_array; 1509 1510 if ((attr_array = prop_array_create()) == NULL) 1511 return; 1512 1513 for (i = 0; ; i++) { 1514 if ((ci = dev->dv_cfdriver->cd_attrs[i]) == NULL) 1515 break; 1516 if ((attr_dict = prop_dictionary_create()) == NULL) 1517 break; 1518 prop_dictionary_set_cstring_nocopy(attr_dict, "attribute-name", 1519 ci->ci_name); 1520 1521 /* Create an array of the locator names and defaults */ 1522 1523 if (ci->ci_loclen != 0 && 1524 (loc_array = prop_array_create()) != NULL) { 1525 for (j = 0; j < ci->ci_loclen; j++) { 1526 loc_dict = prop_dictionary_create(); 1527 if (loc_dict == NULL) 1528 continue; 1529 prop_dictionary_set_cstring_nocopy(loc_dict, 1530 "loc-name", ci->ci_locdesc[j].cld_name); 1531 if (ci->ci_locdesc[j].cld_defaultstr != NULL) 1532 prop_dictionary_set_cstring_nocopy( 1533 loc_dict, "default", 1534 ci->ci_locdesc[j].cld_defaultstr); 1535 prop_array_set(loc_array, j, loc_dict); 1536 prop_object_release(loc_dict); 1537 } 1538 prop_dictionary_set_and_rel(attr_dict, "locators", 1539 loc_array); 1540 } 1541 prop_array_add(attr_array, attr_dict); 1542 prop_object_release(attr_dict); 1543 } 1544 if (i == 0) 1545 prop_object_release(attr_array); 1546 else 1547 prop_dictionary_set_and_rel(dev->dv_properties, 1548 "interface-attributes", attr_array); 1549 1550 return; 1551 } 1552 1553 /* 1554 * Attach a found device. 1555 */ 1556 device_t 1557 config_attach_loc(device_t parent, cfdata_t cf, 1558 const int *locs, void *aux, cfprint_t print) 1559 { 1560 device_t dev; 1561 struct cftable *ct; 1562 const char *drvname; 1563 1564 dev = config_devalloc(parent, cf, locs); 1565 if (!dev) 1566 panic("config_attach: allocation of device softc failed"); 1567 1568 /* XXX redundant - see below? */ 1569 if (cf->cf_fstate != FSTATE_STAR) { 1570 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1571 cf->cf_fstate = FSTATE_FOUND; 1572 } 1573 1574 config_devlink(dev); 1575 1576 if (config_do_twiddle && cold) 1577 twiddle(); 1578 else 1579 aprint_naive("Found "); 1580 /* 1581 * We want the next two printfs for normal, verbose, and quiet, 1582 * but not silent (in which case, we're twiddling, instead). 1583 */ 1584 if (parent == ROOT) { 1585 aprint_naive("%s (root)", device_xname(dev)); 1586 aprint_normal("%s (root)", device_xname(dev)); 1587 } else { 1588 aprint_naive("%s at %s", device_xname(dev), 1589 device_xname(parent)); 1590 aprint_normal("%s at %s", device_xname(dev), 1591 device_xname(parent)); 1592 if (print) 1593 (void) (*print)(aux, NULL); 1594 } 1595 1596 /* 1597 * Before attaching, clobber any unfound devices that are 1598 * otherwise identical. 1599 * XXX code above is redundant? 1600 */ 1601 drvname = dev->dv_cfdriver->cd_name; 1602 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1603 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1604 if (STREQ(cf->cf_name, drvname) && 1605 cf->cf_unit == dev->dv_unit) { 1606 if (cf->cf_fstate == FSTATE_NOTFOUND) 1607 cf->cf_fstate = FSTATE_FOUND; 1608 } 1609 } 1610 } 1611 device_register(dev, aux); 1612 1613 /* Let userland know */ 1614 devmon_report_device(dev, true); 1615 1616 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1617 1618 if (((dev->dv_flags & DVF_ATTACH_INPROGRESS) == 0) 1619 && !device_pmf_is_registered(dev)) 1620 aprint_debug_dev(dev, 1621 "WARNING: power management not supported\n"); 1622 1623 config_process_deferred(&deferred_config_queue, dev); 1624 1625 device_register_post_config(dev, aux); 1626 return dev; 1627 } 1628 1629 device_t 1630 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1631 { 1632 1633 return config_attach_loc(parent, cf, NULL, aux, print); 1634 } 1635 1636 /* 1637 * As above, but for pseudo-devices. Pseudo-devices attached in this 1638 * way are silently inserted into the device tree, and their children 1639 * attached. 1640 * 1641 * Note that because pseudo-devices are attached silently, any information 1642 * the attach routine wishes to print should be prefixed with the device 1643 * name by the attach routine. 1644 */ 1645 device_t 1646 config_attach_pseudo(cfdata_t cf) 1647 { 1648 device_t dev; 1649 1650 dev = config_devalloc(ROOT, cf, NULL); 1651 if (!dev) 1652 return NULL; 1653 1654 /* XXX mark busy in cfdata */ 1655 1656 if (cf->cf_fstate != FSTATE_STAR) { 1657 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1658 cf->cf_fstate = FSTATE_FOUND; 1659 } 1660 1661 config_devlink(dev); 1662 1663 #if 0 /* XXXJRT not yet */ 1664 device_register(dev, NULL); /* like a root node */ 1665 #endif 1666 1667 /* Let userland know */ 1668 devmon_report_device(dev, true); 1669 1670 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1671 1672 config_process_deferred(&deferred_config_queue, dev); 1673 return dev; 1674 } 1675 1676 /* 1677 * Caller must hold alldevs_lock. 1678 */ 1679 static void 1680 config_collect_garbage(struct devicelist *garbage) 1681 { 1682 device_t dv; 1683 1684 KASSERT(!cpu_intr_p()); 1685 KASSERT(!cpu_softintr_p()); 1686 KASSERT(mutex_owned(&alldevs_lock)); 1687 1688 while (alldevs_nwrite == 0 && alldevs_nread == 0 && alldevs_garbage) { 1689 TAILQ_FOREACH(dv, &alldevs, dv_list) { 1690 if (dv->dv_del_gen != 0) 1691 break; 1692 } 1693 if (dv == NULL) { 1694 alldevs_garbage = false; 1695 break; 1696 } 1697 config_devunlink(dv, garbage); 1698 } 1699 KASSERT(mutex_owned(&alldevs_lock)); 1700 } 1701 1702 static void 1703 config_dump_garbage(struct devicelist *garbage) 1704 { 1705 device_t dv; 1706 1707 while ((dv = TAILQ_FIRST(garbage)) != NULL) { 1708 TAILQ_REMOVE(garbage, dv, dv_list); 1709 config_devdelete(dv); 1710 } 1711 } 1712 1713 /* 1714 * Detach a device. Optionally forced (e.g. because of hardware 1715 * removal) and quiet. Returns zero if successful, non-zero 1716 * (an error code) otherwise. 1717 * 1718 * Note that this code wants to be run from a process context, so 1719 * that the detach can sleep to allow processes which have a device 1720 * open to run and unwind their stacks. 1721 */ 1722 int 1723 config_detach(device_t dev, int flags) 1724 { 1725 struct alldevs_foray af; 1726 struct cftable *ct; 1727 cfdata_t cf; 1728 const struct cfattach *ca; 1729 struct cfdriver *cd; 1730 device_t d __diagused; 1731 int rv = 0; 1732 1733 cf = dev->dv_cfdata; 1734 KASSERTMSG((cf == NULL || cf->cf_fstate == FSTATE_FOUND || 1735 cf->cf_fstate == FSTATE_STAR), 1736 "config_detach: %s: bad device fstate: %d", 1737 device_xname(dev), cf ? cf->cf_fstate : -1); 1738 1739 cd = dev->dv_cfdriver; 1740 KASSERT(cd != NULL); 1741 1742 ca = dev->dv_cfattach; 1743 KASSERT(ca != NULL); 1744 1745 mutex_enter(&alldevs_lock); 1746 if (dev->dv_del_gen != 0) { 1747 mutex_exit(&alldevs_lock); 1748 #ifdef DIAGNOSTIC 1749 printf("%s: %s is already detached\n", __func__, 1750 device_xname(dev)); 1751 #endif /* DIAGNOSTIC */ 1752 return ENOENT; 1753 } 1754 alldevs_nwrite++; 1755 mutex_exit(&alldevs_lock); 1756 1757 if (!detachall && 1758 (flags & (DETACH_SHUTDOWN|DETACH_FORCE)) == DETACH_SHUTDOWN && 1759 (dev->dv_flags & DVF_DETACH_SHUTDOWN) == 0) { 1760 rv = EOPNOTSUPP; 1761 } else if (ca->ca_detach != NULL) { 1762 rv = (*ca->ca_detach)(dev, flags); 1763 } else 1764 rv = EOPNOTSUPP; 1765 1766 /* 1767 * If it was not possible to detach the device, then we either 1768 * panic() (for the forced but failed case), or return an error. 1769 * 1770 * If it was possible to detach the device, ensure that the 1771 * device is deactivated. 1772 */ 1773 if (rv == 0) 1774 dev->dv_flags &= ~DVF_ACTIVE; 1775 else if ((flags & DETACH_FORCE) == 0) 1776 goto out; 1777 else { 1778 panic("config_detach: forced detach of %s failed (%d)", 1779 device_xname(dev), rv); 1780 } 1781 1782 /* 1783 * The device has now been successfully detached. 1784 */ 1785 1786 /* Let userland know */ 1787 devmon_report_device(dev, false); 1788 1789 #ifdef DIAGNOSTIC 1790 /* 1791 * Sanity: If you're successfully detached, you should have no 1792 * children. (Note that because children must be attached 1793 * after parents, we only need to search the latter part of 1794 * the list.) 1795 */ 1796 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1797 d = TAILQ_NEXT(d, dv_list)) { 1798 if (d->dv_parent == dev && d->dv_del_gen == 0) { 1799 printf("config_detach: detached device %s" 1800 " has children %s\n", device_xname(dev), 1801 device_xname(d)); 1802 panic("config_detach"); 1803 } 1804 } 1805 #endif 1806 1807 /* notify the parent that the child is gone */ 1808 if (dev->dv_parent) { 1809 device_t p = dev->dv_parent; 1810 if (p->dv_cfattach->ca_childdetached) 1811 (*p->dv_cfattach->ca_childdetached)(p, dev); 1812 } 1813 1814 /* 1815 * Mark cfdata to show that the unit can be reused, if possible. 1816 */ 1817 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1818 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1819 if (STREQ(cf->cf_name, cd->cd_name)) { 1820 if (cf->cf_fstate == FSTATE_FOUND && 1821 cf->cf_unit == dev->dv_unit) 1822 cf->cf_fstate = FSTATE_NOTFOUND; 1823 } 1824 } 1825 } 1826 1827 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1828 aprint_normal_dev(dev, "detached\n"); 1829 1830 out: 1831 config_alldevs_enter(&af); 1832 KASSERT(alldevs_nwrite != 0); 1833 --alldevs_nwrite; 1834 if (rv == 0 && dev->dv_del_gen == 0) { 1835 if (alldevs_nwrite == 0 && alldevs_nread == 0) 1836 config_devunlink(dev, &af.af_garbage); 1837 else { 1838 dev->dv_del_gen = alldevs_gen; 1839 alldevs_garbage = true; 1840 } 1841 } 1842 config_alldevs_exit(&af); 1843 1844 return rv; 1845 } 1846 1847 int 1848 config_detach_children(device_t parent, int flags) 1849 { 1850 device_t dv; 1851 deviter_t di; 1852 int error = 0; 1853 1854 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1855 dv = deviter_next(&di)) { 1856 if (device_parent(dv) != parent) 1857 continue; 1858 if ((error = config_detach(dv, flags)) != 0) 1859 break; 1860 } 1861 deviter_release(&di); 1862 return error; 1863 } 1864 1865 device_t 1866 shutdown_first(struct shutdown_state *s) 1867 { 1868 if (!s->initialized) { 1869 deviter_init(&s->di, DEVITER_F_SHUTDOWN|DEVITER_F_LEAVES_FIRST); 1870 s->initialized = true; 1871 } 1872 return shutdown_next(s); 1873 } 1874 1875 device_t 1876 shutdown_next(struct shutdown_state *s) 1877 { 1878 device_t dv; 1879 1880 while ((dv = deviter_next(&s->di)) != NULL && !device_is_active(dv)) 1881 ; 1882 1883 if (dv == NULL) 1884 s->initialized = false; 1885 1886 return dv; 1887 } 1888 1889 bool 1890 config_detach_all(int how) 1891 { 1892 static struct shutdown_state s; 1893 device_t curdev; 1894 bool progress = false; 1895 int flags; 1896 1897 if ((how & (RB_NOSYNC|RB_DUMP)) != 0) 1898 return false; 1899 1900 if ((how & RB_POWERDOWN) == RB_POWERDOWN) 1901 flags = DETACH_SHUTDOWN | DETACH_POWEROFF; 1902 else 1903 flags = DETACH_SHUTDOWN; 1904 1905 for (curdev = shutdown_first(&s); curdev != NULL; 1906 curdev = shutdown_next(&s)) { 1907 aprint_debug(" detaching %s, ", device_xname(curdev)); 1908 if (config_detach(curdev, flags) == 0) { 1909 progress = true; 1910 aprint_debug("success."); 1911 } else 1912 aprint_debug("failed."); 1913 } 1914 return progress; 1915 } 1916 1917 static bool 1918 device_is_ancestor_of(device_t ancestor, device_t descendant) 1919 { 1920 device_t dv; 1921 1922 for (dv = descendant; dv != NULL; dv = device_parent(dv)) { 1923 if (device_parent(dv) == ancestor) 1924 return true; 1925 } 1926 return false; 1927 } 1928 1929 int 1930 config_deactivate(device_t dev) 1931 { 1932 deviter_t di; 1933 const struct cfattach *ca; 1934 device_t descendant; 1935 int s, rv = 0, oflags; 1936 1937 for (descendant = deviter_first(&di, DEVITER_F_ROOT_FIRST); 1938 descendant != NULL; 1939 descendant = deviter_next(&di)) { 1940 if (dev != descendant && 1941 !device_is_ancestor_of(dev, descendant)) 1942 continue; 1943 1944 if ((descendant->dv_flags & DVF_ACTIVE) == 0) 1945 continue; 1946 1947 ca = descendant->dv_cfattach; 1948 oflags = descendant->dv_flags; 1949 1950 descendant->dv_flags &= ~DVF_ACTIVE; 1951 if (ca->ca_activate == NULL) 1952 continue; 1953 s = splhigh(); 1954 rv = (*ca->ca_activate)(descendant, DVACT_DEACTIVATE); 1955 splx(s); 1956 if (rv != 0) 1957 descendant->dv_flags = oflags; 1958 } 1959 deviter_release(&di); 1960 return rv; 1961 } 1962 1963 /* 1964 * Defer the configuration of the specified device until all 1965 * of its parent's devices have been attached. 1966 */ 1967 void 1968 config_defer(device_t dev, void (*func)(device_t)) 1969 { 1970 struct deferred_config *dc; 1971 1972 if (dev->dv_parent == NULL) 1973 panic("config_defer: can't defer config of a root device"); 1974 1975 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1976 1977 config_pending_incr(dev); 1978 1979 mutex_enter(&config_misc_lock); 1980 #ifdef DIAGNOSTIC 1981 struct deferred_config *odc; 1982 TAILQ_FOREACH(odc, &deferred_config_queue, dc_queue) { 1983 if (odc->dc_dev == dev) 1984 panic("config_defer: deferred twice"); 1985 } 1986 #endif 1987 dc->dc_dev = dev; 1988 dc->dc_func = func; 1989 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1990 mutex_exit(&config_misc_lock); 1991 } 1992 1993 /* 1994 * Defer some autoconfiguration for a device until after interrupts 1995 * are enabled. 1996 */ 1997 void 1998 config_interrupts(device_t dev, void (*func)(device_t)) 1999 { 2000 struct deferred_config *dc; 2001 2002 /* 2003 * If interrupts are enabled, callback now. 2004 */ 2005 if (cold == 0) { 2006 (*func)(dev); 2007 return; 2008 } 2009 2010 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2011 2012 config_pending_incr(dev); 2013 2014 mutex_enter(&config_misc_lock); 2015 #ifdef DIAGNOSTIC 2016 struct deferred_config *odc; 2017 TAILQ_FOREACH(odc, &interrupt_config_queue, dc_queue) { 2018 if (odc->dc_dev == dev) 2019 panic("config_interrupts: deferred twice"); 2020 } 2021 #endif 2022 dc->dc_dev = dev; 2023 dc->dc_func = func; 2024 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 2025 dev->dv_flags |= DVF_ATTACH_INPROGRESS; 2026 mutex_exit(&config_misc_lock); 2027 } 2028 2029 /* 2030 * Defer some autoconfiguration for a device until after root file system 2031 * is mounted (to load firmware etc). 2032 */ 2033 void 2034 config_mountroot(device_t dev, void (*func)(device_t)) 2035 { 2036 struct deferred_config *dc; 2037 2038 /* 2039 * If root file system is mounted, callback now. 2040 */ 2041 if (root_is_mounted) { 2042 (*func)(dev); 2043 return; 2044 } 2045 2046 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2047 2048 mutex_enter(&config_misc_lock); 2049 #ifdef DIAGNOSTIC 2050 struct deferred_config *odc; 2051 TAILQ_FOREACH(odc, &mountroot_config_queue, dc_queue) { 2052 if (odc->dc_dev == dev) 2053 panic("%s: deferred twice", __func__); 2054 } 2055 #endif 2056 2057 dc->dc_dev = dev; 2058 dc->dc_func = func; 2059 TAILQ_INSERT_TAIL(&mountroot_config_queue, dc, dc_queue); 2060 mutex_exit(&config_misc_lock); 2061 } 2062 2063 /* 2064 * Process a deferred configuration queue. 2065 */ 2066 static void 2067 config_process_deferred(struct deferred_config_head *queue, device_t parent) 2068 { 2069 struct deferred_config *dc; 2070 2071 mutex_enter(&config_misc_lock); 2072 dc = TAILQ_FIRST(queue); 2073 while (dc) { 2074 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 2075 TAILQ_REMOVE(queue, dc, dc_queue); 2076 mutex_exit(&config_misc_lock); 2077 2078 (*dc->dc_func)(dc->dc_dev); 2079 config_pending_decr(dc->dc_dev); 2080 kmem_free(dc, sizeof(*dc)); 2081 2082 mutex_enter(&config_misc_lock); 2083 /* Restart, queue might have changed */ 2084 dc = TAILQ_FIRST(queue); 2085 } else { 2086 dc = TAILQ_NEXT(dc, dc_queue); 2087 } 2088 } 2089 mutex_exit(&config_misc_lock); 2090 } 2091 2092 /* 2093 * Manipulate the config_pending semaphore. 2094 */ 2095 void 2096 config_pending_incr(device_t dev) 2097 { 2098 2099 mutex_enter(&config_misc_lock); 2100 config_pending++; 2101 #ifdef DEBUG_AUTOCONF 2102 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2103 #endif 2104 mutex_exit(&config_misc_lock); 2105 } 2106 2107 void 2108 config_pending_decr(device_t dev) 2109 { 2110 2111 KASSERT(0 < config_pending); 2112 mutex_enter(&config_misc_lock); 2113 config_pending--; 2114 #ifdef DEBUG_AUTOCONF 2115 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2116 #endif 2117 if (config_pending == 0) 2118 cv_broadcast(&config_misc_cv); 2119 mutex_exit(&config_misc_lock); 2120 } 2121 2122 /* 2123 * Register a "finalization" routine. Finalization routines are 2124 * called iteratively once all real devices have been found during 2125 * autoconfiguration, for as long as any one finalizer has done 2126 * any work. 2127 */ 2128 int 2129 config_finalize_register(device_t dev, int (*fn)(device_t)) 2130 { 2131 struct finalize_hook *f; 2132 2133 /* 2134 * If finalization has already been done, invoke the 2135 * callback function now. 2136 */ 2137 if (config_finalize_done) { 2138 while ((*fn)(dev) != 0) 2139 /* loop */ ; 2140 return 0; 2141 } 2142 2143 /* Ensure this isn't already on the list. */ 2144 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 2145 if (f->f_func == fn && f->f_dev == dev) 2146 return EEXIST; 2147 } 2148 2149 f = kmem_alloc(sizeof(*f), KM_SLEEP); 2150 f->f_func = fn; 2151 f->f_dev = dev; 2152 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 2153 2154 return 0; 2155 } 2156 2157 void 2158 config_finalize(void) 2159 { 2160 struct finalize_hook *f; 2161 struct pdevinit *pdev; 2162 extern struct pdevinit pdevinit[]; 2163 int errcnt, rv; 2164 2165 /* 2166 * Now that device driver threads have been created, wait for 2167 * them to finish any deferred autoconfiguration. 2168 */ 2169 mutex_enter(&config_misc_lock); 2170 while (config_pending != 0) 2171 cv_wait(&config_misc_cv, &config_misc_lock); 2172 mutex_exit(&config_misc_lock); 2173 2174 KERNEL_LOCK(1, NULL); 2175 2176 /* Attach pseudo-devices. */ 2177 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 2178 (*pdev->pdev_attach)(pdev->pdev_count); 2179 2180 /* Run the hooks until none of them does any work. */ 2181 do { 2182 rv = 0; 2183 TAILQ_FOREACH(f, &config_finalize_list, f_list) 2184 rv |= (*f->f_func)(f->f_dev); 2185 } while (rv != 0); 2186 2187 config_finalize_done = 1; 2188 2189 /* Now free all the hooks. */ 2190 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 2191 TAILQ_REMOVE(&config_finalize_list, f, f_list); 2192 kmem_free(f, sizeof(*f)); 2193 } 2194 2195 KERNEL_UNLOCK_ONE(NULL); 2196 2197 errcnt = aprint_get_error_count(); 2198 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 2199 (boothowto & AB_VERBOSE) == 0) { 2200 mutex_enter(&config_misc_lock); 2201 if (config_do_twiddle) { 2202 config_do_twiddle = 0; 2203 printf_nolog(" done.\n"); 2204 } 2205 mutex_exit(&config_misc_lock); 2206 } 2207 if (errcnt != 0) { 2208 printf("WARNING: %d error%s while detecting hardware; " 2209 "check system log.\n", errcnt, 2210 errcnt == 1 ? "" : "s"); 2211 } 2212 } 2213 2214 void 2215 config_twiddle_init(void) 2216 { 2217 2218 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 2219 config_do_twiddle = 1; 2220 } 2221 callout_setfunc(&config_twiddle_ch, config_twiddle_fn, NULL); 2222 } 2223 2224 void 2225 config_twiddle_fn(void *cookie) 2226 { 2227 2228 mutex_enter(&config_misc_lock); 2229 if (config_do_twiddle) { 2230 twiddle(); 2231 callout_schedule(&config_twiddle_ch, mstohz(100)); 2232 } 2233 mutex_exit(&config_misc_lock); 2234 } 2235 2236 static void 2237 config_alldevs_enter(struct alldevs_foray *af) 2238 { 2239 TAILQ_INIT(&af->af_garbage); 2240 mutex_enter(&alldevs_lock); 2241 config_collect_garbage(&af->af_garbage); 2242 } 2243 2244 static void 2245 config_alldevs_exit(struct alldevs_foray *af) 2246 { 2247 mutex_exit(&alldevs_lock); 2248 config_dump_garbage(&af->af_garbage); 2249 } 2250 2251 /* 2252 * device_lookup: 2253 * 2254 * Look up a device instance for a given driver. 2255 */ 2256 device_t 2257 device_lookup(cfdriver_t cd, int unit) 2258 { 2259 device_t dv; 2260 2261 mutex_enter(&alldevs_lock); 2262 if (unit < 0 || unit >= cd->cd_ndevs) 2263 dv = NULL; 2264 else if ((dv = cd->cd_devs[unit]) != NULL && dv->dv_del_gen != 0) 2265 dv = NULL; 2266 mutex_exit(&alldevs_lock); 2267 2268 return dv; 2269 } 2270 2271 /* 2272 * device_lookup_private: 2273 * 2274 * Look up a softc instance for a given driver. 2275 */ 2276 void * 2277 device_lookup_private(cfdriver_t cd, int unit) 2278 { 2279 2280 return device_private(device_lookup(cd, unit)); 2281 } 2282 2283 /* 2284 * device_find_by_xname: 2285 * 2286 * Returns the device of the given name or NULL if it doesn't exist. 2287 */ 2288 device_t 2289 device_find_by_xname(const char *name) 2290 { 2291 device_t dv; 2292 deviter_t di; 2293 2294 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 2295 if (strcmp(device_xname(dv), name) == 0) 2296 break; 2297 } 2298 deviter_release(&di); 2299 2300 return dv; 2301 } 2302 2303 /* 2304 * device_find_by_driver_unit: 2305 * 2306 * Returns the device of the given driver name and unit or 2307 * NULL if it doesn't exist. 2308 */ 2309 device_t 2310 device_find_by_driver_unit(const char *name, int unit) 2311 { 2312 struct cfdriver *cd; 2313 2314 if ((cd = config_cfdriver_lookup(name)) == NULL) 2315 return NULL; 2316 return device_lookup(cd, unit); 2317 } 2318 2319 /* 2320 * device_compatible_match: 2321 * 2322 * Match a driver's "compatible" data against a device's 2323 * "compatible" strings. If a match is found, we return 2324 * a weighted match result, and optionally the matching 2325 * entry. 2326 */ 2327 int 2328 device_compatible_match(const char **device_compats, int ndevice_compats, 2329 const struct device_compatible_entry *driver_compats, 2330 const struct device_compatible_entry **matching_entryp) 2331 { 2332 const struct device_compatible_entry *dce = NULL; 2333 int i, match_weight; 2334 2335 if (ndevice_compats == 0 || device_compats == NULL || 2336 driver_compats == NULL) 2337 return 0; 2338 2339 /* 2340 * We take the first match because we start with the most-specific 2341 * device compatible string. 2342 */ 2343 for (i = 0, match_weight = ndevice_compats - 1; 2344 i < ndevice_compats; 2345 i++, match_weight--) { 2346 for (dce = driver_compats; dce->compat != NULL; dce++) { 2347 if (strcmp(dce->compat, device_compats[i]) == 0) { 2348 KASSERT(match_weight >= 0); 2349 if (matching_entryp) 2350 *matching_entryp = dce; 2351 return 1 + match_weight; 2352 } 2353 } 2354 } 2355 return 0; 2356 } 2357 2358 /* 2359 * Power management related functions. 2360 */ 2361 2362 bool 2363 device_pmf_is_registered(device_t dev) 2364 { 2365 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 2366 } 2367 2368 bool 2369 device_pmf_driver_suspend(device_t dev, const pmf_qual_t *qual) 2370 { 2371 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2372 return true; 2373 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2374 return false; 2375 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2376 dev->dv_driver_suspend != NULL && 2377 !(*dev->dv_driver_suspend)(dev, qual)) 2378 return false; 2379 2380 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 2381 return true; 2382 } 2383 2384 bool 2385 device_pmf_driver_resume(device_t dev, const pmf_qual_t *qual) 2386 { 2387 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2388 return true; 2389 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2390 return false; 2391 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2392 dev->dv_driver_resume != NULL && 2393 !(*dev->dv_driver_resume)(dev, qual)) 2394 return false; 2395 2396 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2397 return true; 2398 } 2399 2400 bool 2401 device_pmf_driver_shutdown(device_t dev, int how) 2402 { 2403 2404 if (*dev->dv_driver_shutdown != NULL && 2405 !(*dev->dv_driver_shutdown)(dev, how)) 2406 return false; 2407 return true; 2408 } 2409 2410 bool 2411 device_pmf_driver_register(device_t dev, 2412 bool (*suspend)(device_t, const pmf_qual_t *), 2413 bool (*resume)(device_t, const pmf_qual_t *), 2414 bool (*shutdown)(device_t, int)) 2415 { 2416 dev->dv_driver_suspend = suspend; 2417 dev->dv_driver_resume = resume; 2418 dev->dv_driver_shutdown = shutdown; 2419 dev->dv_flags |= DVF_POWER_HANDLERS; 2420 return true; 2421 } 2422 2423 static const char * 2424 curlwp_name(void) 2425 { 2426 if (curlwp->l_name != NULL) 2427 return curlwp->l_name; 2428 else 2429 return curlwp->l_proc->p_comm; 2430 } 2431 2432 void 2433 device_pmf_driver_deregister(device_t dev) 2434 { 2435 device_lock_t dvl = device_getlock(dev); 2436 2437 dev->dv_driver_suspend = NULL; 2438 dev->dv_driver_resume = NULL; 2439 2440 mutex_enter(&dvl->dvl_mtx); 2441 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2442 while (dvl->dvl_nlock > 0 || dvl->dvl_nwait > 0) { 2443 /* Wake a thread that waits for the lock. That 2444 * thread will fail to acquire the lock, and then 2445 * it will wake the next thread that waits for the 2446 * lock, or else it will wake us. 2447 */ 2448 cv_signal(&dvl->dvl_cv); 2449 pmflock_debug(dev, __func__, __LINE__); 2450 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2451 pmflock_debug(dev, __func__, __LINE__); 2452 } 2453 mutex_exit(&dvl->dvl_mtx); 2454 } 2455 2456 bool 2457 device_pmf_driver_child_register(device_t dev) 2458 { 2459 device_t parent = device_parent(dev); 2460 2461 if (parent == NULL || parent->dv_driver_child_register == NULL) 2462 return true; 2463 return (*parent->dv_driver_child_register)(dev); 2464 } 2465 2466 void 2467 device_pmf_driver_set_child_register(device_t dev, 2468 bool (*child_register)(device_t)) 2469 { 2470 dev->dv_driver_child_register = child_register; 2471 } 2472 2473 static void 2474 pmflock_debug(device_t dev, const char *func, int line) 2475 { 2476 device_lock_t dvl = device_getlock(dev); 2477 2478 aprint_debug_dev(dev, 2479 "%s.%d, %s dvl_nlock %d dvl_nwait %d dv_flags %x\n", func, line, 2480 curlwp_name(), dvl->dvl_nlock, dvl->dvl_nwait, dev->dv_flags); 2481 } 2482 2483 static bool 2484 device_pmf_lock1(device_t dev) 2485 { 2486 device_lock_t dvl = device_getlock(dev); 2487 2488 while (device_pmf_is_registered(dev) && 2489 dvl->dvl_nlock > 0 && dvl->dvl_holder != curlwp) { 2490 dvl->dvl_nwait++; 2491 pmflock_debug(dev, __func__, __LINE__); 2492 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2493 pmflock_debug(dev, __func__, __LINE__); 2494 dvl->dvl_nwait--; 2495 } 2496 if (!device_pmf_is_registered(dev)) { 2497 pmflock_debug(dev, __func__, __LINE__); 2498 /* We could not acquire the lock, but some other thread may 2499 * wait for it, also. Wake that thread. 2500 */ 2501 cv_signal(&dvl->dvl_cv); 2502 return false; 2503 } 2504 dvl->dvl_nlock++; 2505 dvl->dvl_holder = curlwp; 2506 pmflock_debug(dev, __func__, __LINE__); 2507 return true; 2508 } 2509 2510 bool 2511 device_pmf_lock(device_t dev) 2512 { 2513 bool rc; 2514 device_lock_t dvl = device_getlock(dev); 2515 2516 mutex_enter(&dvl->dvl_mtx); 2517 rc = device_pmf_lock1(dev); 2518 mutex_exit(&dvl->dvl_mtx); 2519 2520 return rc; 2521 } 2522 2523 void 2524 device_pmf_unlock(device_t dev) 2525 { 2526 device_lock_t dvl = device_getlock(dev); 2527 2528 KASSERT(dvl->dvl_nlock > 0); 2529 mutex_enter(&dvl->dvl_mtx); 2530 if (--dvl->dvl_nlock == 0) 2531 dvl->dvl_holder = NULL; 2532 cv_signal(&dvl->dvl_cv); 2533 pmflock_debug(dev, __func__, __LINE__); 2534 mutex_exit(&dvl->dvl_mtx); 2535 } 2536 2537 device_lock_t 2538 device_getlock(device_t dev) 2539 { 2540 return &dev->dv_lock; 2541 } 2542 2543 void * 2544 device_pmf_bus_private(device_t dev) 2545 { 2546 return dev->dv_bus_private; 2547 } 2548 2549 bool 2550 device_pmf_bus_suspend(device_t dev, const pmf_qual_t *qual) 2551 { 2552 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2553 return true; 2554 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2555 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2556 return false; 2557 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2558 dev->dv_bus_suspend != NULL && 2559 !(*dev->dv_bus_suspend)(dev, qual)) 2560 return false; 2561 2562 dev->dv_flags |= DVF_BUS_SUSPENDED; 2563 return true; 2564 } 2565 2566 bool 2567 device_pmf_bus_resume(device_t dev, const pmf_qual_t *qual) 2568 { 2569 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2570 return true; 2571 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2572 dev->dv_bus_resume != NULL && 2573 !(*dev->dv_bus_resume)(dev, qual)) 2574 return false; 2575 2576 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2577 return true; 2578 } 2579 2580 bool 2581 device_pmf_bus_shutdown(device_t dev, int how) 2582 { 2583 2584 if (*dev->dv_bus_shutdown != NULL && 2585 !(*dev->dv_bus_shutdown)(dev, how)) 2586 return false; 2587 return true; 2588 } 2589 2590 void 2591 device_pmf_bus_register(device_t dev, void *priv, 2592 bool (*suspend)(device_t, const pmf_qual_t *), 2593 bool (*resume)(device_t, const pmf_qual_t *), 2594 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2595 { 2596 dev->dv_bus_private = priv; 2597 dev->dv_bus_resume = resume; 2598 dev->dv_bus_suspend = suspend; 2599 dev->dv_bus_shutdown = shutdown; 2600 dev->dv_bus_deregister = deregister; 2601 } 2602 2603 void 2604 device_pmf_bus_deregister(device_t dev) 2605 { 2606 if (dev->dv_bus_deregister == NULL) 2607 return; 2608 (*dev->dv_bus_deregister)(dev); 2609 dev->dv_bus_private = NULL; 2610 dev->dv_bus_suspend = NULL; 2611 dev->dv_bus_resume = NULL; 2612 dev->dv_bus_deregister = NULL; 2613 } 2614 2615 void * 2616 device_pmf_class_private(device_t dev) 2617 { 2618 return dev->dv_class_private; 2619 } 2620 2621 bool 2622 device_pmf_class_suspend(device_t dev, const pmf_qual_t *qual) 2623 { 2624 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2625 return true; 2626 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2627 dev->dv_class_suspend != NULL && 2628 !(*dev->dv_class_suspend)(dev, qual)) 2629 return false; 2630 2631 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2632 return true; 2633 } 2634 2635 bool 2636 device_pmf_class_resume(device_t dev, const pmf_qual_t *qual) 2637 { 2638 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2639 return true; 2640 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2641 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2642 return false; 2643 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2644 dev->dv_class_resume != NULL && 2645 !(*dev->dv_class_resume)(dev, qual)) 2646 return false; 2647 2648 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2649 return true; 2650 } 2651 2652 void 2653 device_pmf_class_register(device_t dev, void *priv, 2654 bool (*suspend)(device_t, const pmf_qual_t *), 2655 bool (*resume)(device_t, const pmf_qual_t *), 2656 void (*deregister)(device_t)) 2657 { 2658 dev->dv_class_private = priv; 2659 dev->dv_class_suspend = suspend; 2660 dev->dv_class_resume = resume; 2661 dev->dv_class_deregister = deregister; 2662 } 2663 2664 void 2665 device_pmf_class_deregister(device_t dev) 2666 { 2667 if (dev->dv_class_deregister == NULL) 2668 return; 2669 (*dev->dv_class_deregister)(dev); 2670 dev->dv_class_private = NULL; 2671 dev->dv_class_suspend = NULL; 2672 dev->dv_class_resume = NULL; 2673 dev->dv_class_deregister = NULL; 2674 } 2675 2676 bool 2677 device_active(device_t dev, devactive_t type) 2678 { 2679 size_t i; 2680 2681 if (dev->dv_activity_count == 0) 2682 return false; 2683 2684 for (i = 0; i < dev->dv_activity_count; ++i) { 2685 if (dev->dv_activity_handlers[i] == NULL) 2686 break; 2687 (*dev->dv_activity_handlers[i])(dev, type); 2688 } 2689 2690 return true; 2691 } 2692 2693 bool 2694 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2695 { 2696 void (**new_handlers)(device_t, devactive_t); 2697 void (**old_handlers)(device_t, devactive_t); 2698 size_t i, old_size, new_size; 2699 int s; 2700 2701 old_handlers = dev->dv_activity_handlers; 2702 old_size = dev->dv_activity_count; 2703 2704 KASSERT(old_size == 0 || old_handlers != NULL); 2705 2706 for (i = 0; i < old_size; ++i) { 2707 KASSERT(old_handlers[i] != handler); 2708 if (old_handlers[i] == NULL) { 2709 old_handlers[i] = handler; 2710 return true; 2711 } 2712 } 2713 2714 new_size = old_size + 4; 2715 new_handlers = kmem_alloc(sizeof(void *[new_size]), KM_SLEEP); 2716 2717 for (i = 0; i < old_size; ++i) 2718 new_handlers[i] = old_handlers[i]; 2719 new_handlers[old_size] = handler; 2720 for (i = old_size+1; i < new_size; ++i) 2721 new_handlers[i] = NULL; 2722 2723 s = splhigh(); 2724 dev->dv_activity_count = new_size; 2725 dev->dv_activity_handlers = new_handlers; 2726 splx(s); 2727 2728 if (old_size > 0) 2729 kmem_free(old_handlers, sizeof(void * [old_size])); 2730 2731 return true; 2732 } 2733 2734 void 2735 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2736 { 2737 void (**old_handlers)(device_t, devactive_t); 2738 size_t i, old_size; 2739 int s; 2740 2741 old_handlers = dev->dv_activity_handlers; 2742 old_size = dev->dv_activity_count; 2743 2744 for (i = 0; i < old_size; ++i) { 2745 if (old_handlers[i] == handler) 2746 break; 2747 if (old_handlers[i] == NULL) 2748 return; /* XXX panic? */ 2749 } 2750 2751 if (i == old_size) 2752 return; /* XXX panic? */ 2753 2754 for (; i < old_size - 1; ++i) { 2755 if ((old_handlers[i] = old_handlers[i + 1]) != NULL) 2756 continue; 2757 2758 if (i == 0) { 2759 s = splhigh(); 2760 dev->dv_activity_count = 0; 2761 dev->dv_activity_handlers = NULL; 2762 splx(s); 2763 kmem_free(old_handlers, sizeof(void *[old_size])); 2764 } 2765 return; 2766 } 2767 old_handlers[i] = NULL; 2768 } 2769 2770 /* Return true iff the device_t `dev' exists at generation `gen'. */ 2771 static bool 2772 device_exists_at(device_t dv, devgen_t gen) 2773 { 2774 return (dv->dv_del_gen == 0 || dv->dv_del_gen > gen) && 2775 dv->dv_add_gen <= gen; 2776 } 2777 2778 static bool 2779 deviter_visits(const deviter_t *di, device_t dv) 2780 { 2781 return device_exists_at(dv, di->di_gen); 2782 } 2783 2784 /* 2785 * Device Iteration 2786 * 2787 * deviter_t: a device iterator. Holds state for a "walk" visiting 2788 * each device_t's in the device tree. 2789 * 2790 * deviter_init(di, flags): initialize the device iterator `di' 2791 * to "walk" the device tree. deviter_next(di) will return 2792 * the first device_t in the device tree, or NULL if there are 2793 * no devices. 2794 * 2795 * `flags' is one or more of DEVITER_F_RW, indicating that the 2796 * caller intends to modify the device tree by calling 2797 * config_detach(9) on devices in the order that the iterator 2798 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2799 * nearest the "root" of the device tree to be returned, first; 2800 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2801 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2802 * indicating both that deviter_init() should not respect any 2803 * locks on the device tree, and that deviter_next(di) may run 2804 * in more than one LWP before the walk has finished. 2805 * 2806 * Only one DEVITER_F_RW iterator may be in the device tree at 2807 * once. 2808 * 2809 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2810 * 2811 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2812 * DEVITER_F_LEAVES_FIRST are used in combination. 2813 * 2814 * deviter_first(di, flags): initialize the device iterator `di' 2815 * and return the first device_t in the device tree, or NULL 2816 * if there are no devices. The statement 2817 * 2818 * dv = deviter_first(di); 2819 * 2820 * is shorthand for 2821 * 2822 * deviter_init(di); 2823 * dv = deviter_next(di); 2824 * 2825 * deviter_next(di): return the next device_t in the device tree, 2826 * or NULL if there are no more devices. deviter_next(di) 2827 * is undefined if `di' was not initialized with deviter_init() or 2828 * deviter_first(). 2829 * 2830 * deviter_release(di): stops iteration (subsequent calls to 2831 * deviter_next() will return NULL), releases any locks and 2832 * resources held by the device iterator. 2833 * 2834 * Device iteration does not return device_t's in any particular 2835 * order. An iterator will never return the same device_t twice. 2836 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2837 * is called repeatedly on the same `di', it will eventually return 2838 * NULL. It is ok to attach/detach devices during device iteration. 2839 */ 2840 void 2841 deviter_init(deviter_t *di, deviter_flags_t flags) 2842 { 2843 device_t dv; 2844 2845 memset(di, 0, sizeof(*di)); 2846 2847 if ((flags & DEVITER_F_SHUTDOWN) != 0) 2848 flags |= DEVITER_F_RW; 2849 2850 mutex_enter(&alldevs_lock); 2851 if ((flags & DEVITER_F_RW) != 0) 2852 alldevs_nwrite++; 2853 else 2854 alldevs_nread++; 2855 di->di_gen = alldevs_gen++; 2856 di->di_flags = flags; 2857 2858 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2859 case DEVITER_F_LEAVES_FIRST: 2860 TAILQ_FOREACH(dv, &alldevs, dv_list) { 2861 if (!deviter_visits(di, dv)) 2862 continue; 2863 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2864 } 2865 break; 2866 case DEVITER_F_ROOT_FIRST: 2867 TAILQ_FOREACH(dv, &alldevs, dv_list) { 2868 if (!deviter_visits(di, dv)) 2869 continue; 2870 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2871 } 2872 break; 2873 default: 2874 break; 2875 } 2876 2877 deviter_reinit(di); 2878 mutex_exit(&alldevs_lock); 2879 } 2880 2881 static void 2882 deviter_reinit(deviter_t *di) 2883 { 2884 2885 KASSERT(mutex_owned(&alldevs_lock)); 2886 if ((di->di_flags & DEVITER_F_RW) != 0) 2887 di->di_prev = TAILQ_LAST(&alldevs, devicelist); 2888 else 2889 di->di_prev = TAILQ_FIRST(&alldevs); 2890 } 2891 2892 device_t 2893 deviter_first(deviter_t *di, deviter_flags_t flags) 2894 { 2895 2896 deviter_init(di, flags); 2897 return deviter_next(di); 2898 } 2899 2900 static device_t 2901 deviter_next2(deviter_t *di) 2902 { 2903 device_t dv; 2904 2905 KASSERT(mutex_owned(&alldevs_lock)); 2906 2907 dv = di->di_prev; 2908 2909 if (dv == NULL) 2910 return NULL; 2911 2912 if ((di->di_flags & DEVITER_F_RW) != 0) 2913 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2914 else 2915 di->di_prev = TAILQ_NEXT(dv, dv_list); 2916 2917 return dv; 2918 } 2919 2920 static device_t 2921 deviter_next1(deviter_t *di) 2922 { 2923 device_t dv; 2924 2925 KASSERT(mutex_owned(&alldevs_lock)); 2926 2927 do { 2928 dv = deviter_next2(di); 2929 } while (dv != NULL && !deviter_visits(di, dv)); 2930 2931 return dv; 2932 } 2933 2934 device_t 2935 deviter_next(deviter_t *di) 2936 { 2937 device_t dv = NULL; 2938 2939 mutex_enter(&alldevs_lock); 2940 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2941 case 0: 2942 dv = deviter_next1(di); 2943 break; 2944 case DEVITER_F_LEAVES_FIRST: 2945 while (di->di_curdepth >= 0) { 2946 if ((dv = deviter_next1(di)) == NULL) { 2947 di->di_curdepth--; 2948 deviter_reinit(di); 2949 } else if (dv->dv_depth == di->di_curdepth) 2950 break; 2951 } 2952 break; 2953 case DEVITER_F_ROOT_FIRST: 2954 while (di->di_curdepth <= di->di_maxdepth) { 2955 if ((dv = deviter_next1(di)) == NULL) { 2956 di->di_curdepth++; 2957 deviter_reinit(di); 2958 } else if (dv->dv_depth == di->di_curdepth) 2959 break; 2960 } 2961 break; 2962 default: 2963 break; 2964 } 2965 mutex_exit(&alldevs_lock); 2966 2967 return dv; 2968 } 2969 2970 void 2971 deviter_release(deviter_t *di) 2972 { 2973 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 2974 2975 mutex_enter(&alldevs_lock); 2976 if (rw) 2977 --alldevs_nwrite; 2978 else 2979 --alldevs_nread; 2980 /* XXX wake a garbage-collection thread */ 2981 mutex_exit(&alldevs_lock); 2982 } 2983 2984 const char * 2985 cfdata_ifattr(const struct cfdata *cf) 2986 { 2987 return cf->cf_pspec->cfp_iattr; 2988 } 2989 2990 bool 2991 ifattr_match(const char *snull, const char *t) 2992 { 2993 return (snull == NULL) || strcmp(snull, t) == 0; 2994 } 2995 2996 void 2997 null_childdetached(device_t self, device_t child) 2998 { 2999 /* do nothing */ 3000 } 3001 3002 static void 3003 sysctl_detach_setup(struct sysctllog **clog) 3004 { 3005 3006 sysctl_createv(clog, 0, NULL, NULL, 3007 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 3008 CTLTYPE_BOOL, "detachall", 3009 SYSCTL_DESCR("Detach all devices at shutdown"), 3010 NULL, 0, &detachall, 0, 3011 CTL_KERN, CTL_CREATE, CTL_EOL); 3012 } 3013
Indexes created Thu Sep 25 08:09:54 GMT 2025