subr_autoconf.c revision 1.267
1 /* $NetBSD: subr_autoconf.c,v 1.267 2020/02/25 19:14:05 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 1.267 2020/02/25 19:14:05 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 device_t dev; 446 447 mutex_enter(&config_misc_lock); 448 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 449 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 450 mutex_exit(&config_misc_lock); 451 452 dev = dc->dc_dev; 453 (*dc->dc_func)(dev); 454 if (!device_pmf_is_registered(dev)) 455 aprint_debug_dev(dev, 456 "WARNING: power management not supported\n"); 457 config_pending_decr(dev); 458 kmem_free(dc, sizeof(*dc)); 459 460 mutex_enter(&config_misc_lock); 461 dev->dv_flags &= ~DVF_ATTACH_INPROGRESS; 462 } 463 mutex_exit(&config_misc_lock); 464 465 kthread_exit(0); 466 } 467 468 void 469 config_create_interruptthreads(void) 470 { 471 int i; 472 473 for (i = 0; i < interrupt_config_threads; i++) { 474 (void)kthread_create(PRI_NONE, 0/*XXXSMP */, NULL, 475 config_interrupts_thread, NULL, NULL, "configintr"); 476 } 477 } 478 479 static void 480 config_mountroot_thread(void *cookie) 481 { 482 struct deferred_config *dc; 483 484 mutex_enter(&config_misc_lock); 485 while ((dc = TAILQ_FIRST(&mountroot_config_queue)) != NULL) { 486 TAILQ_REMOVE(&mountroot_config_queue, dc, dc_queue); 487 mutex_exit(&config_misc_lock); 488 489 (*dc->dc_func)(dc->dc_dev); 490 kmem_free(dc, sizeof(*dc)); 491 492 mutex_enter(&config_misc_lock); 493 } 494 mutex_exit(&config_misc_lock); 495 496 kthread_exit(0); 497 } 498 499 void 500 config_create_mountrootthreads(void) 501 { 502 int i; 503 504 if (!root_is_mounted) 505 root_is_mounted = true; 506 507 mountroot_config_lwpids_size = sizeof(mountroot_config_lwpids) * 508 mountroot_config_threads; 509 mountroot_config_lwpids = kmem_alloc(mountroot_config_lwpids_size, 510 KM_NOSLEEP); 511 KASSERT(mountroot_config_lwpids); 512 for (i = 0; i < mountroot_config_threads; i++) { 513 mountroot_config_lwpids[i] = 0; 514 (void)kthread_create(PRI_NONE, KTHREAD_MUSTJOIN/* XXXSMP */, 515 NULL, config_mountroot_thread, NULL, 516 &mountroot_config_lwpids[i], 517 "configroot"); 518 } 519 } 520 521 void 522 config_finalize_mountroot(void) 523 { 524 int i, error; 525 526 for (i = 0; i < mountroot_config_threads; i++) { 527 if (mountroot_config_lwpids[i] == 0) 528 continue; 529 530 error = kthread_join(mountroot_config_lwpids[i]); 531 if (error) 532 printf("%s: thread %x joined with error %d\n", 533 __func__, i, error); 534 } 535 kmem_free(mountroot_config_lwpids, mountroot_config_lwpids_size); 536 } 537 538 /* 539 * Announce device attach/detach to userland listeners. 540 */ 541 542 int 543 no_devmon_insert(const char *name, prop_dictionary_t p) 544 { 545 546 return ENODEV; 547 } 548 549 static void 550 devmon_report_device(device_t dev, bool isattach) 551 { 552 prop_dictionary_t ev; 553 const char *parent; 554 const char *what; 555 device_t pdev = device_parent(dev); 556 557 /* If currently no drvctl device, just return */ 558 if (devmon_insert_vec == no_devmon_insert) 559 return; 560 561 ev = prop_dictionary_create(); 562 if (ev == NULL) 563 return; 564 565 what = (isattach ? "device-attach" : "device-detach"); 566 parent = (pdev == NULL ? "root" : device_xname(pdev)); 567 if (!prop_dictionary_set_cstring(ev, "device", device_xname(dev)) || 568 !prop_dictionary_set_cstring(ev, "parent", parent)) { 569 prop_object_release(ev); 570 return; 571 } 572 573 if ((*devmon_insert_vec)(what, ev) != 0) 574 prop_object_release(ev); 575 } 576 577 /* 578 * Add a cfdriver to the system. 579 */ 580 int 581 config_cfdriver_attach(struct cfdriver *cd) 582 { 583 struct cfdriver *lcd; 584 585 /* Make sure this driver isn't already in the system. */ 586 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 587 if (STREQ(lcd->cd_name, cd->cd_name)) 588 return EEXIST; 589 } 590 591 LIST_INIT(&cd->cd_attach); 592 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 593 594 return 0; 595 } 596 597 /* 598 * Remove a cfdriver from the system. 599 */ 600 int 601 config_cfdriver_detach(struct cfdriver *cd) 602 { 603 struct alldevs_foray af; 604 int i, rc = 0; 605 606 config_alldevs_enter(&af); 607 /* Make sure there are no active instances. */ 608 for (i = 0; i < cd->cd_ndevs; i++) { 609 if (cd->cd_devs[i] != NULL) { 610 rc = EBUSY; 611 break; 612 } 613 } 614 config_alldevs_exit(&af); 615 616 if (rc != 0) 617 return rc; 618 619 /* ...and no attachments loaded. */ 620 if (LIST_EMPTY(&cd->cd_attach) == 0) 621 return EBUSY; 622 623 LIST_REMOVE(cd, cd_list); 624 625 KASSERT(cd->cd_devs == NULL); 626 627 return 0; 628 } 629 630 /* 631 * Look up a cfdriver by name. 632 */ 633 struct cfdriver * 634 config_cfdriver_lookup(const char *name) 635 { 636 struct cfdriver *cd; 637 638 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 639 if (STREQ(cd->cd_name, name)) 640 return cd; 641 } 642 643 return NULL; 644 } 645 646 /* 647 * Add a cfattach to the specified driver. 648 */ 649 int 650 config_cfattach_attach(const char *driver, struct cfattach *ca) 651 { 652 struct cfattach *lca; 653 struct cfdriver *cd; 654 655 cd = config_cfdriver_lookup(driver); 656 if (cd == NULL) 657 return ESRCH; 658 659 /* Make sure this attachment isn't already on this driver. */ 660 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 661 if (STREQ(lca->ca_name, ca->ca_name)) 662 return EEXIST; 663 } 664 665 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 666 667 return 0; 668 } 669 670 /* 671 * Remove a cfattach from the specified driver. 672 */ 673 int 674 config_cfattach_detach(const char *driver, struct cfattach *ca) 675 { 676 struct alldevs_foray af; 677 struct cfdriver *cd; 678 device_t dev; 679 int i, rc = 0; 680 681 cd = config_cfdriver_lookup(driver); 682 if (cd == NULL) 683 return ESRCH; 684 685 config_alldevs_enter(&af); 686 /* Make sure there are no active instances. */ 687 for (i = 0; i < cd->cd_ndevs; i++) { 688 if ((dev = cd->cd_devs[i]) == NULL) 689 continue; 690 if (dev->dv_cfattach == ca) { 691 rc = EBUSY; 692 break; 693 } 694 } 695 config_alldevs_exit(&af); 696 697 if (rc != 0) 698 return rc; 699 700 LIST_REMOVE(ca, ca_list); 701 702 return 0; 703 } 704 705 /* 706 * Look up a cfattach by name. 707 */ 708 static struct cfattach * 709 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 710 { 711 struct cfattach *ca; 712 713 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 714 if (STREQ(ca->ca_name, atname)) 715 return ca; 716 } 717 718 return NULL; 719 } 720 721 /* 722 * Look up a cfattach by driver/attachment name. 723 */ 724 struct cfattach * 725 config_cfattach_lookup(const char *name, const char *atname) 726 { 727 struct cfdriver *cd; 728 729 cd = config_cfdriver_lookup(name); 730 if (cd == NULL) 731 return NULL; 732 733 return config_cfattach_lookup_cd(cd, atname); 734 } 735 736 /* 737 * Apply the matching function and choose the best. This is used 738 * a few times and we want to keep the code small. 739 */ 740 static void 741 mapply(struct matchinfo *m, cfdata_t cf) 742 { 743 int pri; 744 745 if (m->fn != NULL) { 746 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 747 } else { 748 pri = config_match(m->parent, cf, m->aux); 749 } 750 if (pri > m->pri) { 751 m->match = cf; 752 m->pri = pri; 753 } 754 } 755 756 int 757 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 758 { 759 const struct cfiattrdata *ci; 760 const struct cflocdesc *cl; 761 int nlocs, i; 762 763 ci = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 764 KASSERT(ci); 765 nlocs = ci->ci_loclen; 766 KASSERT(!nlocs || locs); 767 for (i = 0; i < nlocs; i++) { 768 cl = &ci->ci_locdesc[i]; 769 if (cl->cld_defaultstr != NULL && 770 cf->cf_loc[i] == cl->cld_default) 771 continue; 772 if (cf->cf_loc[i] == locs[i]) 773 continue; 774 return 0; 775 } 776 777 return config_match(parent, cf, aux); 778 } 779 780 /* 781 * Helper function: check whether the driver supports the interface attribute 782 * and return its descriptor structure. 783 */ 784 static const struct cfiattrdata * 785 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 786 { 787 const struct cfiattrdata * const *cpp; 788 789 if (cd->cd_attrs == NULL) 790 return 0; 791 792 for (cpp = cd->cd_attrs; *cpp; cpp++) { 793 if (STREQ((*cpp)->ci_name, ia)) { 794 /* Match. */ 795 return *cpp; 796 } 797 } 798 return 0; 799 } 800 801 /* 802 * Lookup an interface attribute description by name. 803 * If the driver is given, consider only its supported attributes. 804 */ 805 const struct cfiattrdata * 806 cfiattr_lookup(const char *name, const struct cfdriver *cd) 807 { 808 const struct cfdriver *d; 809 const struct cfiattrdata *ia; 810 811 if (cd) 812 return cfdriver_get_iattr(cd, name); 813 814 LIST_FOREACH(d, &allcfdrivers, cd_list) { 815 ia = cfdriver_get_iattr(d, name); 816 if (ia) 817 return ia; 818 } 819 return 0; 820 } 821 822 /* 823 * Determine if `parent' is a potential parent for a device spec based 824 * on `cfp'. 825 */ 826 static int 827 cfparent_match(const device_t parent, const struct cfparent *cfp) 828 { 829 struct cfdriver *pcd; 830 831 /* We don't match root nodes here. */ 832 if (cfp == NULL) 833 return 0; 834 835 pcd = parent->dv_cfdriver; 836 KASSERT(pcd != NULL); 837 838 /* 839 * First, ensure this parent has the correct interface 840 * attribute. 841 */ 842 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 843 return 0; 844 845 /* 846 * If no specific parent device instance was specified (i.e. 847 * we're attaching to the attribute only), we're done! 848 */ 849 if (cfp->cfp_parent == NULL) 850 return 1; 851 852 /* 853 * Check the parent device's name. 854 */ 855 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 856 return 0; /* not the same parent */ 857 858 /* 859 * Make sure the unit number matches. 860 */ 861 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 862 cfp->cfp_unit == parent->dv_unit) 863 return 1; 864 865 /* Unit numbers don't match. */ 866 return 0; 867 } 868 869 /* 870 * Helper for config_cfdata_attach(): check all devices whether it could be 871 * parent any attachment in the config data table passed, and rescan. 872 */ 873 static void 874 rescan_with_cfdata(const struct cfdata *cf) 875 { 876 device_t d; 877 const struct cfdata *cf1; 878 deviter_t di; 879 880 881 /* 882 * "alldevs" is likely longer than a modules's cfdata, so make it 883 * the outer loop. 884 */ 885 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 886 887 if (!(d->dv_cfattach->ca_rescan)) 888 continue; 889 890 for (cf1 = cf; cf1->cf_name; cf1++) { 891 892 if (!cfparent_match(d, cf1->cf_pspec)) 893 continue; 894 895 (*d->dv_cfattach->ca_rescan)(d, 896 cfdata_ifattr(cf1), cf1->cf_loc); 897 898 config_deferred(d); 899 } 900 } 901 deviter_release(&di); 902 } 903 904 /* 905 * Attach a supplemental config data table and rescan potential 906 * parent devices if required. 907 */ 908 int 909 config_cfdata_attach(cfdata_t cf, int scannow) 910 { 911 struct cftable *ct; 912 913 ct = kmem_alloc(sizeof(*ct), KM_SLEEP); 914 ct->ct_cfdata = cf; 915 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 916 917 if (scannow) 918 rescan_with_cfdata(cf); 919 920 return 0; 921 } 922 923 /* 924 * Helper for config_cfdata_detach: check whether a device is 925 * found through any attachment in the config data table. 926 */ 927 static int 928 dev_in_cfdata(device_t d, cfdata_t cf) 929 { 930 const struct cfdata *cf1; 931 932 for (cf1 = cf; cf1->cf_name; cf1++) 933 if (d->dv_cfdata == cf1) 934 return 1; 935 936 return 0; 937 } 938 939 /* 940 * Detach a supplemental config data table. Detach all devices found 941 * through that table (and thus keeping references to it) before. 942 */ 943 int 944 config_cfdata_detach(cfdata_t cf) 945 { 946 device_t d; 947 int error = 0; 948 struct cftable *ct; 949 deviter_t di; 950 951 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 952 d = deviter_next(&di)) { 953 if (!dev_in_cfdata(d, cf)) 954 continue; 955 if ((error = config_detach(d, 0)) != 0) 956 break; 957 } 958 deviter_release(&di); 959 if (error) { 960 aprint_error_dev(d, "unable to detach instance\n"); 961 return error; 962 } 963 964 TAILQ_FOREACH(ct, &allcftables, ct_list) { 965 if (ct->ct_cfdata == cf) { 966 TAILQ_REMOVE(&allcftables, ct, ct_list); 967 kmem_free(ct, sizeof(*ct)); 968 return 0; 969 } 970 } 971 972 /* not found -- shouldn't happen */ 973 return EINVAL; 974 } 975 976 /* 977 * Invoke the "match" routine for a cfdata entry on behalf of 978 * an external caller, usually a "submatch" routine. 979 */ 980 int 981 config_match(device_t parent, cfdata_t cf, void *aux) 982 { 983 struct cfattach *ca; 984 985 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 986 if (ca == NULL) { 987 /* No attachment for this entry, oh well. */ 988 return 0; 989 } 990 991 return (*ca->ca_match)(parent, cf, aux); 992 } 993 994 /* 995 * Iterate over all potential children of some device, calling the given 996 * function (default being the child's match function) for each one. 997 * Nonzero returns are matches; the highest value returned is considered 998 * the best match. Return the `found child' if we got a match, or NULL 999 * otherwise. The `aux' pointer is simply passed on through. 1000 * 1001 * Note that this function is designed so that it can be used to apply 1002 * an arbitrary function to all potential children (its return value 1003 * can be ignored). 1004 */ 1005 cfdata_t 1006 config_search_loc(cfsubmatch_t fn, device_t parent, 1007 const char *ifattr, const int *locs, void *aux) 1008 { 1009 struct cftable *ct; 1010 cfdata_t cf; 1011 struct matchinfo m; 1012 1013 KASSERT(config_initialized); 1014 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 1015 1016 m.fn = fn; 1017 m.parent = parent; 1018 m.locs = locs; 1019 m.aux = aux; 1020 m.match = NULL; 1021 m.pri = 0; 1022 1023 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1024 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1025 1026 /* We don't match root nodes here. */ 1027 if (!cf->cf_pspec) 1028 continue; 1029 1030 /* 1031 * Skip cf if no longer eligible, otherwise scan 1032 * through parents for one matching `parent', and 1033 * try match function. 1034 */ 1035 if (cf->cf_fstate == FSTATE_FOUND) 1036 continue; 1037 if (cf->cf_fstate == FSTATE_DNOTFOUND || 1038 cf->cf_fstate == FSTATE_DSTAR) 1039 continue; 1040 1041 /* 1042 * If an interface attribute was specified, 1043 * consider only children which attach to 1044 * that attribute. 1045 */ 1046 if (ifattr && !STREQ(ifattr, cfdata_ifattr(cf))) 1047 continue; 1048 1049 if (cfparent_match(parent, cf->cf_pspec)) 1050 mapply(&m, cf); 1051 } 1052 } 1053 return m.match; 1054 } 1055 1056 cfdata_t 1057 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 1058 void *aux) 1059 { 1060 1061 return config_search_loc(fn, parent, ifattr, NULL, aux); 1062 } 1063 1064 /* 1065 * Find the given root device. 1066 * This is much like config_search, but there is no parent. 1067 * Don't bother with multiple cfdata tables; the root node 1068 * must always be in the initial table. 1069 */ 1070 cfdata_t 1071 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 1072 { 1073 cfdata_t cf; 1074 const short *p; 1075 struct matchinfo m; 1076 1077 m.fn = fn; 1078 m.parent = ROOT; 1079 m.aux = aux; 1080 m.match = NULL; 1081 m.pri = 0; 1082 m.locs = 0; 1083 /* 1084 * Look at root entries for matching name. We do not bother 1085 * with found-state here since only one root should ever be 1086 * searched (and it must be done first). 1087 */ 1088 for (p = cfroots; *p >= 0; p++) { 1089 cf = &cfdata[*p]; 1090 if (strcmp(cf->cf_name, rootname) == 0) 1091 mapply(&m, cf); 1092 } 1093 return m.match; 1094 } 1095 1096 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 1097 1098 /* 1099 * The given `aux' argument describes a device that has been found 1100 * on the given parent, but not necessarily configured. Locate the 1101 * configuration data for that device (using the submatch function 1102 * provided, or using candidates' cd_match configuration driver 1103 * functions) and attach it, and return its device_t. If the device was 1104 * not configured, call the given `print' function and return NULL. 1105 */ 1106 device_t 1107 config_found_sm_loc(device_t parent, 1108 const char *ifattr, const int *locs, void *aux, 1109 cfprint_t print, cfsubmatch_t submatch) 1110 { 1111 cfdata_t cf; 1112 1113 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 1114 return(config_attach_loc(parent, cf, locs, aux, print)); 1115 if (print) { 1116 if (config_do_twiddle && cold) 1117 twiddle(); 1118 aprint_normal("%s", msgs[(*print)(aux, device_xname(parent))]); 1119 } 1120 1121 /* 1122 * This has the effect of mixing in a single timestamp to the 1123 * entropy pool. Experiments indicate the estimator will almost 1124 * always attribute one bit of entropy to this sample; analysis 1125 * of device attach/detach timestamps on FreeBSD indicates 4 1126 * bits of entropy/sample so this seems appropriately conservative. 1127 */ 1128 rnd_add_uint32(&rnd_autoconf_source, 0); 1129 return NULL; 1130 } 1131 1132 device_t 1133 config_found_ia(device_t parent, const char *ifattr, void *aux, 1134 cfprint_t print) 1135 { 1136 1137 return config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL); 1138 } 1139 1140 device_t 1141 config_found(device_t parent, void *aux, cfprint_t print) 1142 { 1143 1144 return config_found_sm_loc(parent, NULL, NULL, aux, print, NULL); 1145 } 1146 1147 /* 1148 * As above, but for root devices. 1149 */ 1150 device_t 1151 config_rootfound(const char *rootname, void *aux) 1152 { 1153 cfdata_t cf; 1154 1155 if ((cf = config_rootsearch(NULL, rootname, aux)) != NULL) 1156 return config_attach(ROOT, cf, aux, NULL); 1157 aprint_error("root device %s not configured\n", rootname); 1158 return NULL; 1159 } 1160 1161 /* just like sprintf(buf, "%d") except that it works from the end */ 1162 static char * 1163 number(char *ep, int n) 1164 { 1165 1166 *--ep = 0; 1167 while (n >= 10) { 1168 *--ep = (n % 10) + '0'; 1169 n /= 10; 1170 } 1171 *--ep = n + '0'; 1172 return ep; 1173 } 1174 1175 /* 1176 * Expand the size of the cd_devs array if necessary. 1177 * 1178 * The caller must hold alldevs_lock. config_makeroom() may release and 1179 * re-acquire alldevs_lock, so callers should re-check conditions such 1180 * as alldevs_nwrite == 0 and alldevs_nread == 0 when config_makeroom() 1181 * returns. 1182 */ 1183 static void 1184 config_makeroom(int n, struct cfdriver *cd) 1185 { 1186 int ondevs, nndevs; 1187 device_t *osp, *nsp; 1188 1189 KASSERT(mutex_owned(&alldevs_lock)); 1190 alldevs_nwrite++; 1191 1192 for (nndevs = MAX(4, cd->cd_ndevs); nndevs <= n; nndevs += nndevs) 1193 ; 1194 1195 while (n >= cd->cd_ndevs) { 1196 /* 1197 * Need to expand the array. 1198 */ 1199 ondevs = cd->cd_ndevs; 1200 osp = cd->cd_devs; 1201 1202 /* 1203 * Release alldevs_lock around allocation, which may 1204 * sleep. 1205 */ 1206 mutex_exit(&alldevs_lock); 1207 nsp = kmem_alloc(sizeof(device_t[nndevs]), KM_SLEEP); 1208 mutex_enter(&alldevs_lock); 1209 1210 /* 1211 * If another thread moved the array while we did 1212 * not hold alldevs_lock, try again. 1213 */ 1214 if (cd->cd_devs != osp) { 1215 mutex_exit(&alldevs_lock); 1216 kmem_free(nsp, sizeof(device_t[nndevs])); 1217 mutex_enter(&alldevs_lock); 1218 continue; 1219 } 1220 1221 memset(nsp + ondevs, 0, sizeof(device_t[nndevs - ondevs])); 1222 if (ondevs != 0) 1223 memcpy(nsp, cd->cd_devs, sizeof(device_t[ondevs])); 1224 1225 cd->cd_ndevs = nndevs; 1226 cd->cd_devs = nsp; 1227 if (ondevs != 0) { 1228 mutex_exit(&alldevs_lock); 1229 kmem_free(osp, sizeof(device_t[ondevs])); 1230 mutex_enter(&alldevs_lock); 1231 } 1232 } 1233 KASSERT(mutex_owned(&alldevs_lock)); 1234 alldevs_nwrite--; 1235 } 1236 1237 /* 1238 * Put dev into the devices list. 1239 */ 1240 static void 1241 config_devlink(device_t dev) 1242 { 1243 1244 mutex_enter(&alldevs_lock); 1245 1246 KASSERT(device_cfdriver(dev)->cd_devs[dev->dv_unit] == dev); 1247 1248 dev->dv_add_gen = alldevs_gen; 1249 /* It is safe to add a device to the tail of the list while 1250 * readers and writers are in the list. 1251 */ 1252 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); 1253 mutex_exit(&alldevs_lock); 1254 } 1255 1256 static void 1257 config_devfree(device_t dev) 1258 { 1259 int priv = (dev->dv_flags & DVF_PRIV_ALLOC); 1260 1261 if (dev->dv_cfattach->ca_devsize > 0) 1262 kmem_free(dev->dv_private, dev->dv_cfattach->ca_devsize); 1263 if (priv) 1264 kmem_free(dev, sizeof(*dev)); 1265 } 1266 1267 /* 1268 * Caller must hold alldevs_lock. 1269 */ 1270 static void 1271 config_devunlink(device_t dev, struct devicelist *garbage) 1272 { 1273 struct device_garbage *dg = &dev->dv_garbage; 1274 cfdriver_t cd = device_cfdriver(dev); 1275 int i; 1276 1277 KASSERT(mutex_owned(&alldevs_lock)); 1278 1279 /* Unlink from device list. Link to garbage list. */ 1280 TAILQ_REMOVE(&alldevs, dev, dv_list); 1281 TAILQ_INSERT_TAIL(garbage, dev, dv_list); 1282 1283 /* Remove from cfdriver's array. */ 1284 cd->cd_devs[dev->dv_unit] = NULL; 1285 1286 /* 1287 * If the device now has no units in use, unlink its softc array. 1288 */ 1289 for (i = 0; i < cd->cd_ndevs; i++) { 1290 if (cd->cd_devs[i] != NULL) 1291 break; 1292 } 1293 /* Nothing found. Unlink, now. Deallocate, later. */ 1294 if (i == cd->cd_ndevs) { 1295 dg->dg_ndevs = cd->cd_ndevs; 1296 dg->dg_devs = cd->cd_devs; 1297 cd->cd_devs = NULL; 1298 cd->cd_ndevs = 0; 1299 } 1300 } 1301 1302 static void 1303 config_devdelete(device_t dev) 1304 { 1305 struct device_garbage *dg = &dev->dv_garbage; 1306 device_lock_t dvl = device_getlock(dev); 1307 1308 if (dg->dg_devs != NULL) 1309 kmem_free(dg->dg_devs, sizeof(device_t[dg->dg_ndevs])); 1310 1311 cv_destroy(&dvl->dvl_cv); 1312 mutex_destroy(&dvl->dvl_mtx); 1313 1314 KASSERT(dev->dv_properties != NULL); 1315 prop_object_release(dev->dv_properties); 1316 1317 if (dev->dv_activity_handlers) 1318 panic("%s with registered handlers", __func__); 1319 1320 if (dev->dv_locators) { 1321 size_t amount = *--dev->dv_locators; 1322 kmem_free(dev->dv_locators, amount); 1323 } 1324 1325 config_devfree(dev); 1326 } 1327 1328 static int 1329 config_unit_nextfree(cfdriver_t cd, cfdata_t cf) 1330 { 1331 int unit; 1332 1333 if (cf->cf_fstate == FSTATE_STAR) { 1334 for (unit = cf->cf_unit; unit < cd->cd_ndevs; unit++) 1335 if (cd->cd_devs[unit] == NULL) 1336 break; 1337 /* 1338 * unit is now the unit of the first NULL device pointer, 1339 * or max(cd->cd_ndevs,cf->cf_unit). 1340 */ 1341 } else { 1342 unit = cf->cf_unit; 1343 if (unit < cd->cd_ndevs && cd->cd_devs[unit] != NULL) 1344 unit = -1; 1345 } 1346 return unit; 1347 } 1348 1349 static int 1350 config_unit_alloc(device_t dev, cfdriver_t cd, cfdata_t cf) 1351 { 1352 struct alldevs_foray af; 1353 int unit; 1354 1355 config_alldevs_enter(&af); 1356 for (;;) { 1357 unit = config_unit_nextfree(cd, cf); 1358 if (unit == -1) 1359 break; 1360 if (unit < cd->cd_ndevs) { 1361 cd->cd_devs[unit] = dev; 1362 dev->dv_unit = unit; 1363 break; 1364 } 1365 config_makeroom(unit, cd); 1366 } 1367 config_alldevs_exit(&af); 1368 1369 return unit; 1370 } 1371 1372 static device_t 1373 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1374 { 1375 cfdriver_t cd; 1376 cfattach_t ca; 1377 size_t lname, lunit; 1378 const char *xunit; 1379 int myunit; 1380 char num[10]; 1381 device_t dev; 1382 void *dev_private; 1383 const struct cfiattrdata *ia; 1384 device_lock_t dvl; 1385 1386 cd = config_cfdriver_lookup(cf->cf_name); 1387 if (cd == NULL) 1388 return NULL; 1389 1390 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1391 if (ca == NULL) 1392 return NULL; 1393 1394 /* get memory for all device vars */ 1395 KASSERTMSG((ca->ca_flags & DVF_PRIV_ALLOC) 1396 || ca->ca_devsize >= sizeof(struct device), 1397 "%s: %s (%zu < %zu)", __func__, cf->cf_atname, ca->ca_devsize, 1398 sizeof(struct device)); 1399 if (ca->ca_devsize > 0) { 1400 dev_private = kmem_zalloc(ca->ca_devsize, KM_SLEEP); 1401 } else { 1402 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1403 dev_private = NULL; 1404 } 1405 1406 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1407 dev = kmem_zalloc(sizeof(*dev), KM_SLEEP); 1408 } else { 1409 dev = dev_private; 1410 #ifdef DIAGNOSTIC 1411 printf("%s has not been converted to device_t\n", cd->cd_name); 1412 #endif 1413 KASSERT(dev != NULL); 1414 } 1415 dev->dv_class = cd->cd_class; 1416 dev->dv_cfdata = cf; 1417 dev->dv_cfdriver = cd; 1418 dev->dv_cfattach = ca; 1419 dev->dv_activity_count = 0; 1420 dev->dv_activity_handlers = NULL; 1421 dev->dv_private = dev_private; 1422 dev->dv_flags = ca->ca_flags; /* inherit flags from class */ 1423 1424 myunit = config_unit_alloc(dev, cd, cf); 1425 if (myunit == -1) { 1426 config_devfree(dev); 1427 return NULL; 1428 } 1429 1430 /* compute length of name and decimal expansion of unit number */ 1431 lname = strlen(cd->cd_name); 1432 xunit = number(&num[sizeof(num)], myunit); 1433 lunit = &num[sizeof(num)] - xunit; 1434 if (lname + lunit > sizeof(dev->dv_xname)) 1435 panic("config_devalloc: device name too long"); 1436 1437 dvl = device_getlock(dev); 1438 1439 mutex_init(&dvl->dvl_mtx, MUTEX_DEFAULT, IPL_NONE); 1440 cv_init(&dvl->dvl_cv, "pmfsusp"); 1441 1442 memcpy(dev->dv_xname, cd->cd_name, lname); 1443 memcpy(dev->dv_xname + lname, xunit, lunit); 1444 dev->dv_parent = parent; 1445 if (parent != NULL) 1446 dev->dv_depth = parent->dv_depth + 1; 1447 else 1448 dev->dv_depth = 0; 1449 dev->dv_flags |= DVF_ACTIVE; /* always initially active */ 1450 if (locs) { 1451 KASSERT(parent); /* no locators at root */ 1452 ia = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 1453 dev->dv_locators = 1454 kmem_alloc(sizeof(int [ia->ci_loclen + 1]), KM_SLEEP); 1455 *dev->dv_locators++ = sizeof(int [ia->ci_loclen + 1]); 1456 memcpy(dev->dv_locators, locs, sizeof(int [ia->ci_loclen])); 1457 } 1458 dev->dv_properties = prop_dictionary_create(); 1459 KASSERT(dev->dv_properties != NULL); 1460 1461 prop_dictionary_set_cstring_nocopy(dev->dv_properties, 1462 "device-driver", dev->dv_cfdriver->cd_name); 1463 prop_dictionary_set_uint16(dev->dv_properties, 1464 "device-unit", dev->dv_unit); 1465 if (parent != NULL) { 1466 prop_dictionary_set_cstring(dev->dv_properties, 1467 "device-parent", device_xname(parent)); 1468 } 1469 1470 if (dev->dv_cfdriver->cd_attrs != NULL) 1471 config_add_attrib_dict(dev); 1472 1473 return dev; 1474 } 1475 1476 /* 1477 * Create an array of device attach attributes and add it 1478 * to the device's dv_properties dictionary. 1479 * 1480 * <key>interface-attributes</key> 1481 * <array> 1482 * <dict> 1483 * <key>attribute-name</key> 1484 * <string>foo</string> 1485 * <key>locators</key> 1486 * <array> 1487 * <dict> 1488 * <key>loc-name</key> 1489 * <string>foo-loc1</string> 1490 * </dict> 1491 * <dict> 1492 * <key>loc-name</key> 1493 * <string>foo-loc2</string> 1494 * <key>default</key> 1495 * <string>foo-loc2-default</string> 1496 * </dict> 1497 * ... 1498 * </array> 1499 * </dict> 1500 * ... 1501 * </array> 1502 */ 1503 1504 static void 1505 config_add_attrib_dict(device_t dev) 1506 { 1507 int i, j; 1508 const struct cfiattrdata *ci; 1509 prop_dictionary_t attr_dict, loc_dict; 1510 prop_array_t attr_array, loc_array; 1511 1512 if ((attr_array = prop_array_create()) == NULL) 1513 return; 1514 1515 for (i = 0; ; i++) { 1516 if ((ci = dev->dv_cfdriver->cd_attrs[i]) == NULL) 1517 break; 1518 if ((attr_dict = prop_dictionary_create()) == NULL) 1519 break; 1520 prop_dictionary_set_cstring_nocopy(attr_dict, "attribute-name", 1521 ci->ci_name); 1522 1523 /* Create an array of the locator names and defaults */ 1524 1525 if (ci->ci_loclen != 0 && 1526 (loc_array = prop_array_create()) != NULL) { 1527 for (j = 0; j < ci->ci_loclen; j++) { 1528 loc_dict = prop_dictionary_create(); 1529 if (loc_dict == NULL) 1530 continue; 1531 prop_dictionary_set_cstring_nocopy(loc_dict, 1532 "loc-name", ci->ci_locdesc[j].cld_name); 1533 if (ci->ci_locdesc[j].cld_defaultstr != NULL) 1534 prop_dictionary_set_cstring_nocopy( 1535 loc_dict, "default", 1536 ci->ci_locdesc[j].cld_defaultstr); 1537 prop_array_set(loc_array, j, loc_dict); 1538 prop_object_release(loc_dict); 1539 } 1540 prop_dictionary_set_and_rel(attr_dict, "locators", 1541 loc_array); 1542 } 1543 prop_array_add(attr_array, attr_dict); 1544 prop_object_release(attr_dict); 1545 } 1546 if (i == 0) 1547 prop_object_release(attr_array); 1548 else 1549 prop_dictionary_set_and_rel(dev->dv_properties, 1550 "interface-attributes", attr_array); 1551 1552 return; 1553 } 1554 1555 /* 1556 * Attach a found device. 1557 */ 1558 device_t 1559 config_attach_loc(device_t parent, cfdata_t cf, 1560 const int *locs, void *aux, cfprint_t print) 1561 { 1562 device_t dev; 1563 struct cftable *ct; 1564 const char *drvname; 1565 1566 dev = config_devalloc(parent, cf, locs); 1567 if (!dev) 1568 panic("config_attach: allocation of device softc failed"); 1569 1570 /* XXX redundant - see below? */ 1571 if (cf->cf_fstate != FSTATE_STAR) { 1572 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1573 cf->cf_fstate = FSTATE_FOUND; 1574 } 1575 1576 config_devlink(dev); 1577 1578 if (config_do_twiddle && cold) 1579 twiddle(); 1580 else 1581 aprint_naive("Found "); 1582 /* 1583 * We want the next two printfs for normal, verbose, and quiet, 1584 * but not silent (in which case, we're twiddling, instead). 1585 */ 1586 if (parent == ROOT) { 1587 aprint_naive("%s (root)", device_xname(dev)); 1588 aprint_normal("%s (root)", device_xname(dev)); 1589 } else { 1590 aprint_naive("%s at %s", device_xname(dev), 1591 device_xname(parent)); 1592 aprint_normal("%s at %s", device_xname(dev), 1593 device_xname(parent)); 1594 if (print) 1595 (void) (*print)(aux, NULL); 1596 } 1597 1598 /* 1599 * Before attaching, clobber any unfound devices that are 1600 * otherwise identical. 1601 * XXX code above is redundant? 1602 */ 1603 drvname = dev->dv_cfdriver->cd_name; 1604 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1605 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1606 if (STREQ(cf->cf_name, drvname) && 1607 cf->cf_unit == dev->dv_unit) { 1608 if (cf->cf_fstate == FSTATE_NOTFOUND) 1609 cf->cf_fstate = FSTATE_FOUND; 1610 } 1611 } 1612 } 1613 device_register(dev, aux); 1614 1615 /* Let userland know */ 1616 devmon_report_device(dev, true); 1617 1618 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1619 1620 if (((dev->dv_flags & DVF_ATTACH_INPROGRESS) == 0) 1621 && !device_pmf_is_registered(dev)) 1622 aprint_debug_dev(dev, 1623 "WARNING: power management not supported\n"); 1624 1625 config_process_deferred(&deferred_config_queue, dev); 1626 1627 device_register_post_config(dev, aux); 1628 return dev; 1629 } 1630 1631 device_t 1632 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1633 { 1634 1635 return config_attach_loc(parent, cf, NULL, aux, print); 1636 } 1637 1638 /* 1639 * As above, but for pseudo-devices. Pseudo-devices attached in this 1640 * way are silently inserted into the device tree, and their children 1641 * attached. 1642 * 1643 * Note that because pseudo-devices are attached silently, any information 1644 * the attach routine wishes to print should be prefixed with the device 1645 * name by the attach routine. 1646 */ 1647 device_t 1648 config_attach_pseudo(cfdata_t cf) 1649 { 1650 device_t dev; 1651 1652 dev = config_devalloc(ROOT, cf, NULL); 1653 if (!dev) 1654 return NULL; 1655 1656 /* XXX mark busy in cfdata */ 1657 1658 if (cf->cf_fstate != FSTATE_STAR) { 1659 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1660 cf->cf_fstate = FSTATE_FOUND; 1661 } 1662 1663 config_devlink(dev); 1664 1665 #if 0 /* XXXJRT not yet */ 1666 device_register(dev, NULL); /* like a root node */ 1667 #endif 1668 1669 /* Let userland know */ 1670 devmon_report_device(dev, true); 1671 1672 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1673 1674 config_process_deferred(&deferred_config_queue, dev); 1675 return dev; 1676 } 1677 1678 /* 1679 * Caller must hold alldevs_lock. 1680 */ 1681 static void 1682 config_collect_garbage(struct devicelist *garbage) 1683 { 1684 device_t dv; 1685 1686 KASSERT(!cpu_intr_p()); 1687 KASSERT(!cpu_softintr_p()); 1688 KASSERT(mutex_owned(&alldevs_lock)); 1689 1690 while (alldevs_nwrite == 0 && alldevs_nread == 0 && alldevs_garbage) { 1691 TAILQ_FOREACH(dv, &alldevs, dv_list) { 1692 if (dv->dv_del_gen != 0) 1693 break; 1694 } 1695 if (dv == NULL) { 1696 alldevs_garbage = false; 1697 break; 1698 } 1699 config_devunlink(dv, garbage); 1700 } 1701 KASSERT(mutex_owned(&alldevs_lock)); 1702 } 1703 1704 static void 1705 config_dump_garbage(struct devicelist *garbage) 1706 { 1707 device_t dv; 1708 1709 while ((dv = TAILQ_FIRST(garbage)) != NULL) { 1710 TAILQ_REMOVE(garbage, dv, dv_list); 1711 config_devdelete(dv); 1712 } 1713 } 1714 1715 /* 1716 * Detach a device. Optionally forced (e.g. because of hardware 1717 * removal) and quiet. Returns zero if successful, non-zero 1718 * (an error code) otherwise. 1719 * 1720 * Note that this code wants to be run from a process context, so 1721 * that the detach can sleep to allow processes which have a device 1722 * open to run and unwind their stacks. 1723 */ 1724 int 1725 config_detach(device_t dev, int flags) 1726 { 1727 struct alldevs_foray af; 1728 struct cftable *ct; 1729 cfdata_t cf; 1730 const struct cfattach *ca; 1731 struct cfdriver *cd; 1732 device_t d __diagused; 1733 int rv = 0; 1734 1735 cf = dev->dv_cfdata; 1736 KASSERTMSG((cf == NULL || cf->cf_fstate == FSTATE_FOUND || 1737 cf->cf_fstate == FSTATE_STAR), 1738 "config_detach: %s: bad device fstate: %d", 1739 device_xname(dev), cf ? cf->cf_fstate : -1); 1740 1741 cd = dev->dv_cfdriver; 1742 KASSERT(cd != NULL); 1743 1744 ca = dev->dv_cfattach; 1745 KASSERT(ca != NULL); 1746 1747 mutex_enter(&alldevs_lock); 1748 if (dev->dv_del_gen != 0) { 1749 mutex_exit(&alldevs_lock); 1750 #ifdef DIAGNOSTIC 1751 printf("%s: %s is already detached\n", __func__, 1752 device_xname(dev)); 1753 #endif /* DIAGNOSTIC */ 1754 return ENOENT; 1755 } 1756 alldevs_nwrite++; 1757 mutex_exit(&alldevs_lock); 1758 1759 if (!detachall && 1760 (flags & (DETACH_SHUTDOWN|DETACH_FORCE)) == DETACH_SHUTDOWN && 1761 (dev->dv_flags & DVF_DETACH_SHUTDOWN) == 0) { 1762 rv = EOPNOTSUPP; 1763 } else if (ca->ca_detach != NULL) { 1764 rv = (*ca->ca_detach)(dev, flags); 1765 } else 1766 rv = EOPNOTSUPP; 1767 1768 /* 1769 * If it was not possible to detach the device, then we either 1770 * panic() (for the forced but failed case), or return an error. 1771 * 1772 * If it was possible to detach the device, ensure that the 1773 * device is deactivated. 1774 */ 1775 if (rv == 0) 1776 dev->dv_flags &= ~DVF_ACTIVE; 1777 else if ((flags & DETACH_FORCE) == 0) 1778 goto out; 1779 else { 1780 panic("config_detach: forced detach of %s failed (%d)", 1781 device_xname(dev), rv); 1782 } 1783 1784 /* 1785 * The device has now been successfully detached. 1786 */ 1787 1788 /* Let userland know */ 1789 devmon_report_device(dev, false); 1790 1791 #ifdef DIAGNOSTIC 1792 /* 1793 * Sanity: If you're successfully detached, you should have no 1794 * children. (Note that because children must be attached 1795 * after parents, we only need to search the latter part of 1796 * the list.) 1797 */ 1798 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1799 d = TAILQ_NEXT(d, dv_list)) { 1800 if (d->dv_parent == dev && d->dv_del_gen == 0) { 1801 printf("config_detach: detached device %s" 1802 " has children %s\n", device_xname(dev), 1803 device_xname(d)); 1804 panic("config_detach"); 1805 } 1806 } 1807 #endif 1808 1809 /* notify the parent that the child is gone */ 1810 if (dev->dv_parent) { 1811 device_t p = dev->dv_parent; 1812 if (p->dv_cfattach->ca_childdetached) 1813 (*p->dv_cfattach->ca_childdetached)(p, dev); 1814 } 1815 1816 /* 1817 * Mark cfdata to show that the unit can be reused, if possible. 1818 */ 1819 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1820 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1821 if (STREQ(cf->cf_name, cd->cd_name)) { 1822 if (cf->cf_fstate == FSTATE_FOUND && 1823 cf->cf_unit == dev->dv_unit) 1824 cf->cf_fstate = FSTATE_NOTFOUND; 1825 } 1826 } 1827 } 1828 1829 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1830 aprint_normal_dev(dev, "detached\n"); 1831 1832 out: 1833 config_alldevs_enter(&af); 1834 KASSERT(alldevs_nwrite != 0); 1835 --alldevs_nwrite; 1836 if (rv == 0 && dev->dv_del_gen == 0) { 1837 if (alldevs_nwrite == 0 && alldevs_nread == 0) 1838 config_devunlink(dev, &af.af_garbage); 1839 else { 1840 dev->dv_del_gen = alldevs_gen; 1841 alldevs_garbage = true; 1842 } 1843 } 1844 config_alldevs_exit(&af); 1845 1846 return rv; 1847 } 1848 1849 int 1850 config_detach_children(device_t parent, int flags) 1851 { 1852 device_t dv; 1853 deviter_t di; 1854 int error = 0; 1855 1856 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1857 dv = deviter_next(&di)) { 1858 if (device_parent(dv) != parent) 1859 continue; 1860 if ((error = config_detach(dv, flags)) != 0) 1861 break; 1862 } 1863 deviter_release(&di); 1864 return error; 1865 } 1866 1867 device_t 1868 shutdown_first(struct shutdown_state *s) 1869 { 1870 if (!s->initialized) { 1871 deviter_init(&s->di, DEVITER_F_SHUTDOWN|DEVITER_F_LEAVES_FIRST); 1872 s->initialized = true; 1873 } 1874 return shutdown_next(s); 1875 } 1876 1877 device_t 1878 shutdown_next(struct shutdown_state *s) 1879 { 1880 device_t dv; 1881 1882 while ((dv = deviter_next(&s->di)) != NULL && !device_is_active(dv)) 1883 ; 1884 1885 if (dv == NULL) 1886 s->initialized = false; 1887 1888 return dv; 1889 } 1890 1891 bool 1892 config_detach_all(int how) 1893 { 1894 static struct shutdown_state s; 1895 device_t curdev; 1896 bool progress = false; 1897 int flags; 1898 1899 if ((how & (RB_NOSYNC|RB_DUMP)) != 0) 1900 return false; 1901 1902 if ((how & RB_POWERDOWN) == RB_POWERDOWN) 1903 flags = DETACH_SHUTDOWN | DETACH_POWEROFF; 1904 else 1905 flags = DETACH_SHUTDOWN; 1906 1907 for (curdev = shutdown_first(&s); curdev != NULL; 1908 curdev = shutdown_next(&s)) { 1909 aprint_debug(" detaching %s, ", device_xname(curdev)); 1910 if (config_detach(curdev, flags) == 0) { 1911 progress = true; 1912 aprint_debug("success."); 1913 } else 1914 aprint_debug("failed."); 1915 } 1916 return progress; 1917 } 1918 1919 static bool 1920 device_is_ancestor_of(device_t ancestor, device_t descendant) 1921 { 1922 device_t dv; 1923 1924 for (dv = descendant; dv != NULL; dv = device_parent(dv)) { 1925 if (device_parent(dv) == ancestor) 1926 return true; 1927 } 1928 return false; 1929 } 1930 1931 int 1932 config_deactivate(device_t dev) 1933 { 1934 deviter_t di; 1935 const struct cfattach *ca; 1936 device_t descendant; 1937 int s, rv = 0, oflags; 1938 1939 for (descendant = deviter_first(&di, DEVITER_F_ROOT_FIRST); 1940 descendant != NULL; 1941 descendant = deviter_next(&di)) { 1942 if (dev != descendant && 1943 !device_is_ancestor_of(dev, descendant)) 1944 continue; 1945 1946 if ((descendant->dv_flags & DVF_ACTIVE) == 0) 1947 continue; 1948 1949 ca = descendant->dv_cfattach; 1950 oflags = descendant->dv_flags; 1951 1952 descendant->dv_flags &= ~DVF_ACTIVE; 1953 if (ca->ca_activate == NULL) 1954 continue; 1955 s = splhigh(); 1956 rv = (*ca->ca_activate)(descendant, DVACT_DEACTIVATE); 1957 splx(s); 1958 if (rv != 0) 1959 descendant->dv_flags = oflags; 1960 } 1961 deviter_release(&di); 1962 return rv; 1963 } 1964 1965 /* 1966 * Defer the configuration of the specified device until all 1967 * of its parent's devices have been attached. 1968 */ 1969 void 1970 config_defer(device_t dev, void (*func)(device_t)) 1971 { 1972 struct deferred_config *dc; 1973 1974 if (dev->dv_parent == NULL) 1975 panic("config_defer: can't defer config of a root device"); 1976 1977 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1978 1979 config_pending_incr(dev); 1980 1981 mutex_enter(&config_misc_lock); 1982 #ifdef DIAGNOSTIC 1983 struct deferred_config *odc; 1984 TAILQ_FOREACH(odc, &deferred_config_queue, dc_queue) { 1985 if (odc->dc_dev == dev) 1986 panic("config_defer: deferred twice"); 1987 } 1988 #endif 1989 dc->dc_dev = dev; 1990 dc->dc_func = func; 1991 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1992 mutex_exit(&config_misc_lock); 1993 } 1994 1995 /* 1996 * Defer some autoconfiguration for a device until after interrupts 1997 * are enabled. 1998 */ 1999 void 2000 config_interrupts(device_t dev, void (*func)(device_t)) 2001 { 2002 struct deferred_config *dc; 2003 2004 /* 2005 * If interrupts are enabled, callback now. 2006 */ 2007 if (cold == 0) { 2008 (*func)(dev); 2009 return; 2010 } 2011 2012 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2013 2014 config_pending_incr(dev); 2015 2016 mutex_enter(&config_misc_lock); 2017 #ifdef DIAGNOSTIC 2018 struct deferred_config *odc; 2019 TAILQ_FOREACH(odc, &interrupt_config_queue, dc_queue) { 2020 if (odc->dc_dev == dev) 2021 panic("config_interrupts: deferred twice"); 2022 } 2023 #endif 2024 dc->dc_dev = dev; 2025 dc->dc_func = func; 2026 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 2027 dev->dv_flags |= DVF_ATTACH_INPROGRESS; 2028 mutex_exit(&config_misc_lock); 2029 } 2030 2031 /* 2032 * Defer some autoconfiguration for a device until after root file system 2033 * is mounted (to load firmware etc). 2034 */ 2035 void 2036 config_mountroot(device_t dev, void (*func)(device_t)) 2037 { 2038 struct deferred_config *dc; 2039 2040 /* 2041 * If root file system is mounted, callback now. 2042 */ 2043 if (root_is_mounted) { 2044 (*func)(dev); 2045 return; 2046 } 2047 2048 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2049 2050 mutex_enter(&config_misc_lock); 2051 #ifdef DIAGNOSTIC 2052 struct deferred_config *odc; 2053 TAILQ_FOREACH(odc, &mountroot_config_queue, dc_queue) { 2054 if (odc->dc_dev == dev) 2055 panic("%s: deferred twice", __func__); 2056 } 2057 #endif 2058 2059 dc->dc_dev = dev; 2060 dc->dc_func = func; 2061 TAILQ_INSERT_TAIL(&mountroot_config_queue, dc, dc_queue); 2062 mutex_exit(&config_misc_lock); 2063 } 2064 2065 /* 2066 * Process a deferred configuration queue. 2067 */ 2068 static void 2069 config_process_deferred(struct deferred_config_head *queue, device_t parent) 2070 { 2071 struct deferred_config *dc; 2072 2073 mutex_enter(&config_misc_lock); 2074 dc = TAILQ_FIRST(queue); 2075 while (dc) { 2076 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 2077 TAILQ_REMOVE(queue, dc, dc_queue); 2078 mutex_exit(&config_misc_lock); 2079 2080 (*dc->dc_func)(dc->dc_dev); 2081 config_pending_decr(dc->dc_dev); 2082 kmem_free(dc, sizeof(*dc)); 2083 2084 mutex_enter(&config_misc_lock); 2085 /* Restart, queue might have changed */ 2086 dc = TAILQ_FIRST(queue); 2087 } else { 2088 dc = TAILQ_NEXT(dc, dc_queue); 2089 } 2090 } 2091 mutex_exit(&config_misc_lock); 2092 } 2093 2094 /* 2095 * Manipulate the config_pending semaphore. 2096 */ 2097 void 2098 config_pending_incr(device_t dev) 2099 { 2100 2101 mutex_enter(&config_misc_lock); 2102 config_pending++; 2103 #ifdef DEBUG_AUTOCONF 2104 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2105 #endif 2106 mutex_exit(&config_misc_lock); 2107 } 2108 2109 void 2110 config_pending_decr(device_t dev) 2111 { 2112 2113 KASSERT(0 < config_pending); 2114 mutex_enter(&config_misc_lock); 2115 config_pending--; 2116 #ifdef DEBUG_AUTOCONF 2117 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2118 #endif 2119 if (config_pending == 0) 2120 cv_broadcast(&config_misc_cv); 2121 mutex_exit(&config_misc_lock); 2122 } 2123 2124 /* 2125 * Register a "finalization" routine. Finalization routines are 2126 * called iteratively once all real devices have been found during 2127 * autoconfiguration, for as long as any one finalizer has done 2128 * any work. 2129 */ 2130 int 2131 config_finalize_register(device_t dev, int (*fn)(device_t)) 2132 { 2133 struct finalize_hook *f; 2134 2135 /* 2136 * If finalization has already been done, invoke the 2137 * callback function now. 2138 */ 2139 if (config_finalize_done) { 2140 while ((*fn)(dev) != 0) 2141 /* loop */ ; 2142 return 0; 2143 } 2144 2145 /* Ensure this isn't already on the list. */ 2146 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 2147 if (f->f_func == fn && f->f_dev == dev) 2148 return EEXIST; 2149 } 2150 2151 f = kmem_alloc(sizeof(*f), KM_SLEEP); 2152 f->f_func = fn; 2153 f->f_dev = dev; 2154 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 2155 2156 return 0; 2157 } 2158 2159 void 2160 config_finalize(void) 2161 { 2162 struct finalize_hook *f; 2163 struct pdevinit *pdev; 2164 extern struct pdevinit pdevinit[]; 2165 int errcnt, rv; 2166 2167 /* 2168 * Now that device driver threads have been created, wait for 2169 * them to finish any deferred autoconfiguration. 2170 */ 2171 mutex_enter(&config_misc_lock); 2172 while (config_pending != 0) 2173 cv_wait(&config_misc_cv, &config_misc_lock); 2174 mutex_exit(&config_misc_lock); 2175 2176 KERNEL_LOCK(1, NULL); 2177 2178 /* Attach pseudo-devices. */ 2179 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 2180 (*pdev->pdev_attach)(pdev->pdev_count); 2181 2182 /* Run the hooks until none of them does any work. */ 2183 do { 2184 rv = 0; 2185 TAILQ_FOREACH(f, &config_finalize_list, f_list) 2186 rv |= (*f->f_func)(f->f_dev); 2187 } while (rv != 0); 2188 2189 config_finalize_done = 1; 2190 2191 /* Now free all the hooks. */ 2192 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 2193 TAILQ_REMOVE(&config_finalize_list, f, f_list); 2194 kmem_free(f, sizeof(*f)); 2195 } 2196 2197 KERNEL_UNLOCK_ONE(NULL); 2198 2199 errcnt = aprint_get_error_count(); 2200 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 2201 (boothowto & AB_VERBOSE) == 0) { 2202 mutex_enter(&config_misc_lock); 2203 if (config_do_twiddle) { 2204 config_do_twiddle = 0; 2205 printf_nolog(" done.\n"); 2206 } 2207 mutex_exit(&config_misc_lock); 2208 } 2209 if (errcnt != 0) { 2210 printf("WARNING: %d error%s while detecting hardware; " 2211 "check system log.\n", errcnt, 2212 errcnt == 1 ? "" : "s"); 2213 } 2214 } 2215 2216 void 2217 config_twiddle_init(void) 2218 { 2219 2220 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 2221 config_do_twiddle = 1; 2222 } 2223 callout_setfunc(&config_twiddle_ch, config_twiddle_fn, NULL); 2224 } 2225 2226 void 2227 config_twiddle_fn(void *cookie) 2228 { 2229 2230 mutex_enter(&config_misc_lock); 2231 if (config_do_twiddle) { 2232 twiddle(); 2233 callout_schedule(&config_twiddle_ch, mstohz(100)); 2234 } 2235 mutex_exit(&config_misc_lock); 2236 } 2237 2238 static void 2239 config_alldevs_enter(struct alldevs_foray *af) 2240 { 2241 TAILQ_INIT(&af->af_garbage); 2242 mutex_enter(&alldevs_lock); 2243 config_collect_garbage(&af->af_garbage); 2244 } 2245 2246 static void 2247 config_alldevs_exit(struct alldevs_foray *af) 2248 { 2249 mutex_exit(&alldevs_lock); 2250 config_dump_garbage(&af->af_garbage); 2251 } 2252 2253 /* 2254 * device_lookup: 2255 * 2256 * Look up a device instance for a given driver. 2257 */ 2258 device_t 2259 device_lookup(cfdriver_t cd, int unit) 2260 { 2261 device_t dv; 2262 2263 mutex_enter(&alldevs_lock); 2264 if (unit < 0 || unit >= cd->cd_ndevs) 2265 dv = NULL; 2266 else if ((dv = cd->cd_devs[unit]) != NULL && dv->dv_del_gen != 0) 2267 dv = NULL; 2268 mutex_exit(&alldevs_lock); 2269 2270 return dv; 2271 } 2272 2273 /* 2274 * device_lookup_private: 2275 * 2276 * Look up a softc instance for a given driver. 2277 */ 2278 void * 2279 device_lookup_private(cfdriver_t cd, int unit) 2280 { 2281 2282 return device_private(device_lookup(cd, unit)); 2283 } 2284 2285 /* 2286 * device_find_by_xname: 2287 * 2288 * Returns the device of the given name or NULL if it doesn't exist. 2289 */ 2290 device_t 2291 device_find_by_xname(const char *name) 2292 { 2293 device_t dv; 2294 deviter_t di; 2295 2296 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 2297 if (strcmp(device_xname(dv), name) == 0) 2298 break; 2299 } 2300 deviter_release(&di); 2301 2302 return dv; 2303 } 2304 2305 /* 2306 * device_find_by_driver_unit: 2307 * 2308 * Returns the device of the given driver name and unit or 2309 * NULL if it doesn't exist. 2310 */ 2311 device_t 2312 device_find_by_driver_unit(const char *name, int unit) 2313 { 2314 struct cfdriver *cd; 2315 2316 if ((cd = config_cfdriver_lookup(name)) == NULL) 2317 return NULL; 2318 return device_lookup(cd, unit); 2319 } 2320 2321 /* 2322 * device_compatible_match: 2323 * 2324 * Match a driver's "compatible" data against a device's 2325 * "compatible" strings. If a match is found, we return 2326 * a weighted match result, and optionally the matching 2327 * entry. 2328 */ 2329 int 2330 device_compatible_match(const char **device_compats, int ndevice_compats, 2331 const struct device_compatible_entry *driver_compats, 2332 const struct device_compatible_entry **matching_entryp) 2333 { 2334 const struct device_compatible_entry *dce = NULL; 2335 int i, match_weight; 2336 2337 if (ndevice_compats == 0 || device_compats == NULL || 2338 driver_compats == NULL) 2339 return 0; 2340 2341 /* 2342 * We take the first match because we start with the most-specific 2343 * device compatible string. 2344 */ 2345 for (i = 0, match_weight = ndevice_compats - 1; 2346 i < ndevice_compats; 2347 i++, match_weight--) { 2348 for (dce = driver_compats; dce->compat != NULL; dce++) { 2349 if (strcmp(dce->compat, device_compats[i]) == 0) { 2350 KASSERT(match_weight >= 0); 2351 if (matching_entryp) 2352 *matching_entryp = dce; 2353 return 1 + match_weight; 2354 } 2355 } 2356 } 2357 return 0; 2358 } 2359 2360 /* 2361 * Power management related functions. 2362 */ 2363 2364 bool 2365 device_pmf_is_registered(device_t dev) 2366 { 2367 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 2368 } 2369 2370 bool 2371 device_pmf_driver_suspend(device_t dev, const pmf_qual_t *qual) 2372 { 2373 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2374 return true; 2375 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2376 return false; 2377 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2378 dev->dv_driver_suspend != NULL && 2379 !(*dev->dv_driver_suspend)(dev, qual)) 2380 return false; 2381 2382 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 2383 return true; 2384 } 2385 2386 bool 2387 device_pmf_driver_resume(device_t dev, const pmf_qual_t *qual) 2388 { 2389 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2390 return true; 2391 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2392 return false; 2393 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2394 dev->dv_driver_resume != NULL && 2395 !(*dev->dv_driver_resume)(dev, qual)) 2396 return false; 2397 2398 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2399 return true; 2400 } 2401 2402 bool 2403 device_pmf_driver_shutdown(device_t dev, int how) 2404 { 2405 2406 if (*dev->dv_driver_shutdown != NULL && 2407 !(*dev->dv_driver_shutdown)(dev, how)) 2408 return false; 2409 return true; 2410 } 2411 2412 bool 2413 device_pmf_driver_register(device_t dev, 2414 bool (*suspend)(device_t, const pmf_qual_t *), 2415 bool (*resume)(device_t, const pmf_qual_t *), 2416 bool (*shutdown)(device_t, int)) 2417 { 2418 dev->dv_driver_suspend = suspend; 2419 dev->dv_driver_resume = resume; 2420 dev->dv_driver_shutdown = shutdown; 2421 dev->dv_flags |= DVF_POWER_HANDLERS; 2422 return true; 2423 } 2424 2425 static const char * 2426 curlwp_name(void) 2427 { 2428 if (curlwp->l_name != NULL) 2429 return curlwp->l_name; 2430 else 2431 return curlwp->l_proc->p_comm; 2432 } 2433 2434 void 2435 device_pmf_driver_deregister(device_t dev) 2436 { 2437 device_lock_t dvl = device_getlock(dev); 2438 2439 dev->dv_driver_suspend = NULL; 2440 dev->dv_driver_resume = NULL; 2441 2442 mutex_enter(&dvl->dvl_mtx); 2443 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2444 while (dvl->dvl_nlock > 0 || dvl->dvl_nwait > 0) { 2445 /* Wake a thread that waits for the lock. That 2446 * thread will fail to acquire the lock, and then 2447 * it will wake the next thread that waits for the 2448 * lock, or else it will wake us. 2449 */ 2450 cv_signal(&dvl->dvl_cv); 2451 pmflock_debug(dev, __func__, __LINE__); 2452 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2453 pmflock_debug(dev, __func__, __LINE__); 2454 } 2455 mutex_exit(&dvl->dvl_mtx); 2456 } 2457 2458 bool 2459 device_pmf_driver_child_register(device_t dev) 2460 { 2461 device_t parent = device_parent(dev); 2462 2463 if (parent == NULL || parent->dv_driver_child_register == NULL) 2464 return true; 2465 return (*parent->dv_driver_child_register)(dev); 2466 } 2467 2468 void 2469 device_pmf_driver_set_child_register(device_t dev, 2470 bool (*child_register)(device_t)) 2471 { 2472 dev->dv_driver_child_register = child_register; 2473 } 2474 2475 static void 2476 pmflock_debug(device_t dev, const char *func, int line) 2477 { 2478 device_lock_t dvl = device_getlock(dev); 2479 2480 aprint_debug_dev(dev, 2481 "%s.%d, %s dvl_nlock %d dvl_nwait %d dv_flags %x\n", func, line, 2482 curlwp_name(), dvl->dvl_nlock, dvl->dvl_nwait, dev->dv_flags); 2483 } 2484 2485 static bool 2486 device_pmf_lock1(device_t dev) 2487 { 2488 device_lock_t dvl = device_getlock(dev); 2489 2490 while (device_pmf_is_registered(dev) && 2491 dvl->dvl_nlock > 0 && dvl->dvl_holder != curlwp) { 2492 dvl->dvl_nwait++; 2493 pmflock_debug(dev, __func__, __LINE__); 2494 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2495 pmflock_debug(dev, __func__, __LINE__); 2496 dvl->dvl_nwait--; 2497 } 2498 if (!device_pmf_is_registered(dev)) { 2499 pmflock_debug(dev, __func__, __LINE__); 2500 /* We could not acquire the lock, but some other thread may 2501 * wait for it, also. Wake that thread. 2502 */ 2503 cv_signal(&dvl->dvl_cv); 2504 return false; 2505 } 2506 dvl->dvl_nlock++; 2507 dvl->dvl_holder = curlwp; 2508 pmflock_debug(dev, __func__, __LINE__); 2509 return true; 2510 } 2511 2512 bool 2513 device_pmf_lock(device_t dev) 2514 { 2515 bool rc; 2516 device_lock_t dvl = device_getlock(dev); 2517 2518 mutex_enter(&dvl->dvl_mtx); 2519 rc = device_pmf_lock1(dev); 2520 mutex_exit(&dvl->dvl_mtx); 2521 2522 return rc; 2523 } 2524 2525 void 2526 device_pmf_unlock(device_t dev) 2527 { 2528 device_lock_t dvl = device_getlock(dev); 2529 2530 KASSERT(dvl->dvl_nlock > 0); 2531 mutex_enter(&dvl->dvl_mtx); 2532 if (--dvl->dvl_nlock == 0) 2533 dvl->dvl_holder = NULL; 2534 cv_signal(&dvl->dvl_cv); 2535 pmflock_debug(dev, __func__, __LINE__); 2536 mutex_exit(&dvl->dvl_mtx); 2537 } 2538 2539 device_lock_t 2540 device_getlock(device_t dev) 2541 { 2542 return &dev->dv_lock; 2543 } 2544 2545 void * 2546 device_pmf_bus_private(device_t dev) 2547 { 2548 return dev->dv_bus_private; 2549 } 2550 2551 bool 2552 device_pmf_bus_suspend(device_t dev, const pmf_qual_t *qual) 2553 { 2554 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2555 return true; 2556 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2557 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2558 return false; 2559 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2560 dev->dv_bus_suspend != NULL && 2561 !(*dev->dv_bus_suspend)(dev, qual)) 2562 return false; 2563 2564 dev->dv_flags |= DVF_BUS_SUSPENDED; 2565 return true; 2566 } 2567 2568 bool 2569 device_pmf_bus_resume(device_t dev, const pmf_qual_t *qual) 2570 { 2571 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2572 return true; 2573 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2574 dev->dv_bus_resume != NULL && 2575 !(*dev->dv_bus_resume)(dev, qual)) 2576 return false; 2577 2578 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2579 return true; 2580 } 2581 2582 bool 2583 device_pmf_bus_shutdown(device_t dev, int how) 2584 { 2585 2586 if (*dev->dv_bus_shutdown != NULL && 2587 !(*dev->dv_bus_shutdown)(dev, how)) 2588 return false; 2589 return true; 2590 } 2591 2592 void 2593 device_pmf_bus_register(device_t dev, void *priv, 2594 bool (*suspend)(device_t, const pmf_qual_t *), 2595 bool (*resume)(device_t, const pmf_qual_t *), 2596 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2597 { 2598 dev->dv_bus_private = priv; 2599 dev->dv_bus_resume = resume; 2600 dev->dv_bus_suspend = suspend; 2601 dev->dv_bus_shutdown = shutdown; 2602 dev->dv_bus_deregister = deregister; 2603 } 2604 2605 void 2606 device_pmf_bus_deregister(device_t dev) 2607 { 2608 if (dev->dv_bus_deregister == NULL) 2609 return; 2610 (*dev->dv_bus_deregister)(dev); 2611 dev->dv_bus_private = NULL; 2612 dev->dv_bus_suspend = NULL; 2613 dev->dv_bus_resume = NULL; 2614 dev->dv_bus_deregister = NULL; 2615 } 2616 2617 void * 2618 device_pmf_class_private(device_t dev) 2619 { 2620 return dev->dv_class_private; 2621 } 2622 2623 bool 2624 device_pmf_class_suspend(device_t dev, const pmf_qual_t *qual) 2625 { 2626 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2627 return true; 2628 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2629 dev->dv_class_suspend != NULL && 2630 !(*dev->dv_class_suspend)(dev, qual)) 2631 return false; 2632 2633 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2634 return true; 2635 } 2636 2637 bool 2638 device_pmf_class_resume(device_t dev, const pmf_qual_t *qual) 2639 { 2640 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2641 return true; 2642 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2643 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2644 return false; 2645 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2646 dev->dv_class_resume != NULL && 2647 !(*dev->dv_class_resume)(dev, qual)) 2648 return false; 2649 2650 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2651 return true; 2652 } 2653 2654 void 2655 device_pmf_class_register(device_t dev, void *priv, 2656 bool (*suspend)(device_t, const pmf_qual_t *), 2657 bool (*resume)(device_t, const pmf_qual_t *), 2658 void (*deregister)(device_t)) 2659 { 2660 dev->dv_class_private = priv; 2661 dev->dv_class_suspend = suspend; 2662 dev->dv_class_resume = resume; 2663 dev->dv_class_deregister = deregister; 2664 } 2665 2666 void 2667 device_pmf_class_deregister(device_t dev) 2668 { 2669 if (dev->dv_class_deregister == NULL) 2670 return; 2671 (*dev->dv_class_deregister)(dev); 2672 dev->dv_class_private = NULL; 2673 dev->dv_class_suspend = NULL; 2674 dev->dv_class_resume = NULL; 2675 dev->dv_class_deregister = NULL; 2676 } 2677 2678 bool 2679 device_active(device_t dev, devactive_t type) 2680 { 2681 size_t i; 2682 2683 if (dev->dv_activity_count == 0) 2684 return false; 2685 2686 for (i = 0; i < dev->dv_activity_count; ++i) { 2687 if (dev->dv_activity_handlers[i] == NULL) 2688 break; 2689 (*dev->dv_activity_handlers[i])(dev, type); 2690 } 2691 2692 return true; 2693 } 2694 2695 bool 2696 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2697 { 2698 void (**new_handlers)(device_t, devactive_t); 2699 void (**old_handlers)(device_t, devactive_t); 2700 size_t i, old_size, new_size; 2701 int s; 2702 2703 old_handlers = dev->dv_activity_handlers; 2704 old_size = dev->dv_activity_count; 2705 2706 KASSERT(old_size == 0 || old_handlers != NULL); 2707 2708 for (i = 0; i < old_size; ++i) { 2709 KASSERT(old_handlers[i] != handler); 2710 if (old_handlers[i] == NULL) { 2711 old_handlers[i] = handler; 2712 return true; 2713 } 2714 } 2715 2716 new_size = old_size + 4; 2717 new_handlers = kmem_alloc(sizeof(void *[new_size]), KM_SLEEP); 2718 2719 for (i = 0; i < old_size; ++i) 2720 new_handlers[i] = old_handlers[i]; 2721 new_handlers[old_size] = handler; 2722 for (i = old_size+1; i < new_size; ++i) 2723 new_handlers[i] = NULL; 2724 2725 s = splhigh(); 2726 dev->dv_activity_count = new_size; 2727 dev->dv_activity_handlers = new_handlers; 2728 splx(s); 2729 2730 if (old_size > 0) 2731 kmem_free(old_handlers, sizeof(void * [old_size])); 2732 2733 return true; 2734 } 2735 2736 void 2737 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2738 { 2739 void (**old_handlers)(device_t, devactive_t); 2740 size_t i, old_size; 2741 int s; 2742 2743 old_handlers = dev->dv_activity_handlers; 2744 old_size = dev->dv_activity_count; 2745 2746 for (i = 0; i < old_size; ++i) { 2747 if (old_handlers[i] == handler) 2748 break; 2749 if (old_handlers[i] == NULL) 2750 return; /* XXX panic? */ 2751 } 2752 2753 if (i == old_size) 2754 return; /* XXX panic? */ 2755 2756 for (; i < old_size - 1; ++i) { 2757 if ((old_handlers[i] = old_handlers[i + 1]) != NULL) 2758 continue; 2759 2760 if (i == 0) { 2761 s = splhigh(); 2762 dev->dv_activity_count = 0; 2763 dev->dv_activity_handlers = NULL; 2764 splx(s); 2765 kmem_free(old_handlers, sizeof(void *[old_size])); 2766 } 2767 return; 2768 } 2769 old_handlers[i] = NULL; 2770 } 2771 2772 /* Return true iff the device_t `dev' exists at generation `gen'. */ 2773 static bool 2774 device_exists_at(device_t dv, devgen_t gen) 2775 { 2776 return (dv->dv_del_gen == 0 || dv->dv_del_gen > gen) && 2777 dv->dv_add_gen <= gen; 2778 } 2779 2780 static bool 2781 deviter_visits(const deviter_t *di, device_t dv) 2782 { 2783 return device_exists_at(dv, di->di_gen); 2784 } 2785 2786 /* 2787 * Device Iteration 2788 * 2789 * deviter_t: a device iterator. Holds state for a "walk" visiting 2790 * each device_t's in the device tree. 2791 * 2792 * deviter_init(di, flags): initialize the device iterator `di' 2793 * to "walk" the device tree. deviter_next(di) will return 2794 * the first device_t in the device tree, or NULL if there are 2795 * no devices. 2796 * 2797 * `flags' is one or more of DEVITER_F_RW, indicating that the 2798 * caller intends to modify the device tree by calling 2799 * config_detach(9) on devices in the order that the iterator 2800 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2801 * nearest the "root" of the device tree to be returned, first; 2802 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2803 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2804 * indicating both that deviter_init() should not respect any 2805 * locks on the device tree, and that deviter_next(di) may run 2806 * in more than one LWP before the walk has finished. 2807 * 2808 * Only one DEVITER_F_RW iterator may be in the device tree at 2809 * once. 2810 * 2811 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2812 * 2813 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2814 * DEVITER_F_LEAVES_FIRST are used in combination. 2815 * 2816 * deviter_first(di, flags): initialize the device iterator `di' 2817 * and return the first device_t in the device tree, or NULL 2818 * if there are no devices. The statement 2819 * 2820 * dv = deviter_first(di); 2821 * 2822 * is shorthand for 2823 * 2824 * deviter_init(di); 2825 * dv = deviter_next(di); 2826 * 2827 * deviter_next(di): return the next device_t in the device tree, 2828 * or NULL if there are no more devices. deviter_next(di) 2829 * is undefined if `di' was not initialized with deviter_init() or 2830 * deviter_first(). 2831 * 2832 * deviter_release(di): stops iteration (subsequent calls to 2833 * deviter_next() will return NULL), releases any locks and 2834 * resources held by the device iterator. 2835 * 2836 * Device iteration does not return device_t's in any particular 2837 * order. An iterator will never return the same device_t twice. 2838 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2839 * is called repeatedly on the same `di', it will eventually return 2840 * NULL. It is ok to attach/detach devices during device iteration. 2841 */ 2842 void 2843 deviter_init(deviter_t *di, deviter_flags_t flags) 2844 { 2845 device_t dv; 2846 2847 memset(di, 0, sizeof(*di)); 2848 2849 if ((flags & DEVITER_F_SHUTDOWN) != 0) 2850 flags |= DEVITER_F_RW; 2851 2852 mutex_enter(&alldevs_lock); 2853 if ((flags & DEVITER_F_RW) != 0) 2854 alldevs_nwrite++; 2855 else 2856 alldevs_nread++; 2857 di->di_gen = alldevs_gen++; 2858 di->di_flags = flags; 2859 2860 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2861 case DEVITER_F_LEAVES_FIRST: 2862 TAILQ_FOREACH(dv, &alldevs, dv_list) { 2863 if (!deviter_visits(di, dv)) 2864 continue; 2865 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2866 } 2867 break; 2868 case DEVITER_F_ROOT_FIRST: 2869 TAILQ_FOREACH(dv, &alldevs, dv_list) { 2870 if (!deviter_visits(di, dv)) 2871 continue; 2872 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2873 } 2874 break; 2875 default: 2876 break; 2877 } 2878 2879 deviter_reinit(di); 2880 mutex_exit(&alldevs_lock); 2881 } 2882 2883 static void 2884 deviter_reinit(deviter_t *di) 2885 { 2886 2887 KASSERT(mutex_owned(&alldevs_lock)); 2888 if ((di->di_flags & DEVITER_F_RW) != 0) 2889 di->di_prev = TAILQ_LAST(&alldevs, devicelist); 2890 else 2891 di->di_prev = TAILQ_FIRST(&alldevs); 2892 } 2893 2894 device_t 2895 deviter_first(deviter_t *di, deviter_flags_t flags) 2896 { 2897 2898 deviter_init(di, flags); 2899 return deviter_next(di); 2900 } 2901 2902 static device_t 2903 deviter_next2(deviter_t *di) 2904 { 2905 device_t dv; 2906 2907 KASSERT(mutex_owned(&alldevs_lock)); 2908 2909 dv = di->di_prev; 2910 2911 if (dv == NULL) 2912 return NULL; 2913 2914 if ((di->di_flags & DEVITER_F_RW) != 0) 2915 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2916 else 2917 di->di_prev = TAILQ_NEXT(dv, dv_list); 2918 2919 return dv; 2920 } 2921 2922 static device_t 2923 deviter_next1(deviter_t *di) 2924 { 2925 device_t dv; 2926 2927 KASSERT(mutex_owned(&alldevs_lock)); 2928 2929 do { 2930 dv = deviter_next2(di); 2931 } while (dv != NULL && !deviter_visits(di, dv)); 2932 2933 return dv; 2934 } 2935 2936 device_t 2937 deviter_next(deviter_t *di) 2938 { 2939 device_t dv = NULL; 2940 2941 mutex_enter(&alldevs_lock); 2942 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2943 case 0: 2944 dv = deviter_next1(di); 2945 break; 2946 case DEVITER_F_LEAVES_FIRST: 2947 while (di->di_curdepth >= 0) { 2948 if ((dv = deviter_next1(di)) == NULL) { 2949 di->di_curdepth--; 2950 deviter_reinit(di); 2951 } else if (dv->dv_depth == di->di_curdepth) 2952 break; 2953 } 2954 break; 2955 case DEVITER_F_ROOT_FIRST: 2956 while (di->di_curdepth <= di->di_maxdepth) { 2957 if ((dv = deviter_next1(di)) == NULL) { 2958 di->di_curdepth++; 2959 deviter_reinit(di); 2960 } else if (dv->dv_depth == di->di_curdepth) 2961 break; 2962 } 2963 break; 2964 default: 2965 break; 2966 } 2967 mutex_exit(&alldevs_lock); 2968 2969 return dv; 2970 } 2971 2972 void 2973 deviter_release(deviter_t *di) 2974 { 2975 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 2976 2977 mutex_enter(&alldevs_lock); 2978 if (rw) 2979 --alldevs_nwrite; 2980 else 2981 --alldevs_nread; 2982 /* XXX wake a garbage-collection thread */ 2983 mutex_exit(&alldevs_lock); 2984 } 2985 2986 const char * 2987 cfdata_ifattr(const struct cfdata *cf) 2988 { 2989 return cf->cf_pspec->cfp_iattr; 2990 } 2991 2992 bool 2993 ifattr_match(const char *snull, const char *t) 2994 { 2995 return (snull == NULL) || strcmp(snull, t) == 0; 2996 } 2997 2998 void 2999 null_childdetached(device_t self, device_t child) 3000 { 3001 /* do nothing */ 3002 } 3003 3004 static void 3005 sysctl_detach_setup(struct sysctllog **clog) 3006 { 3007 3008 sysctl_createv(clog, 0, NULL, NULL, 3009 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 3010 CTLTYPE_BOOL, "detachall", 3011 SYSCTL_DESCR("Detach all devices at shutdown"), 3012 NULL, 0, &detachall, 0, 3013 CTL_KERN, CTL_CREATE, CTL_EOL); 3014 } 3015
Indexes created Thu Sep 25 16:09:42 GMT 2025