subr_autoconf.c revision 1.251
1 /* $NetBSD: subr_autoconf.c,v 1.251 2017/03/20 01:13:07 riastradh Exp $ */ 2 3 /* 4 * Copyright (c) 1996, 2000 Christopher G. Demetriou 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed for the 18 * NetBSD Project. See http://www.NetBSD.org/ for 19 * information about NetBSD. 20 * 4. The name of the author may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 * 34 * --(license Id: LICENSE.proto,v 1.1 2000/06/13 21:40:26 cgd Exp )-- 35 */ 36 37 /* 38 * Copyright (c) 1992, 1993 39 * The Regents of the University of California. All rights reserved. 40 * 41 * This software was developed by the Computer Systems Engineering group 42 * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and 43 * contributed to Berkeley. 44 * 45 * All advertising materials mentioning features or use of this software 46 * must display the following acknowledgement: 47 * This product includes software developed by the University of 48 * California, Lawrence Berkeley Laboratories. 49 * 50 * Redistribution and use in source and binary forms, with or without 51 * modification, are permitted provided that the following conditions 52 * are met: 53 * 1. Redistributions of source code must retain the above copyright 54 * notice, this list of conditions and the following disclaimer. 55 * 2. Redistributions in binary form must reproduce the above copyright 56 * notice, this list of conditions and the following disclaimer in the 57 * documentation and/or other materials provided with the distribution. 58 * 3. Neither the name of the University nor the names of its contributors 59 * may be used to endorse or promote products derived from this software 60 * without specific prior written permission. 61 * 62 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 63 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 64 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 65 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 66 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 67 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 68 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 69 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 70 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 71 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 72 * SUCH DAMAGE. 73 * 74 * from: Header: subr_autoconf.c,v 1.12 93/02/01 19:31:48 torek Exp (LBL) 75 * 76 * @(#)subr_autoconf.c 8.3 (Berkeley) 5/17/94 77 */ 78 79 #include <sys/cdefs.h> 80 __KERNEL_RCSID(0, "$NetBSD: subr_autoconf.c,v 1.251 2017/03/20 01:13:07 riastradh Exp $"); 81 82 #ifdef _KERNEL_OPT 83 #include "opt_ddb.h" 84 #include "drvctl.h" 85 #endif 86 87 #include <sys/param.h> 88 #include <sys/device.h> 89 #include <sys/disklabel.h> 90 #include <sys/conf.h> 91 #include <sys/kauth.h> 92 #include <sys/kmem.h> 93 #include <sys/systm.h> 94 #include <sys/kernel.h> 95 #include <sys/errno.h> 96 #include <sys/proc.h> 97 #include <sys/reboot.h> 98 #include <sys/kthread.h> 99 #include <sys/buf.h> 100 #include <sys/dirent.h> 101 #include <sys/mount.h> 102 #include <sys/namei.h> 103 #include <sys/unistd.h> 104 #include <sys/fcntl.h> 105 #include <sys/lockf.h> 106 #include <sys/callout.h> 107 #include <sys/devmon.h> 108 #include <sys/cpu.h> 109 #include <sys/sysctl.h> 110 111 #include <sys/disk.h> 112 113 #include <sys/rndsource.h> 114 115 #include <machine/limits.h> 116 117 /* 118 * Autoconfiguration subroutines. 119 */ 120 121 /* 122 * Device autoconfiguration timings are mixed into the entropy pool. 123 */ 124 extern krndsource_t rnd_autoconf_source; 125 126 /* 127 * ioconf.c exports exactly two names: cfdata and cfroots. All system 128 * devices and drivers are found via these tables. 129 */ 130 extern struct cfdata cfdata[]; 131 extern const short cfroots[]; 132 133 /* 134 * List of all cfdriver structures. We use this to detect duplicates 135 * when other cfdrivers are loaded. 136 */ 137 struct cfdriverlist allcfdrivers = LIST_HEAD_INITIALIZER(&allcfdrivers); 138 extern struct cfdriver * const cfdriver_list_initial[]; 139 140 /* 141 * Initial list of cfattach's. 142 */ 143 extern const struct cfattachinit cfattachinit[]; 144 145 /* 146 * List of cfdata tables. We always have one such list -- the one 147 * built statically when the kernel was configured. 148 */ 149 struct cftablelist allcftables = TAILQ_HEAD_INITIALIZER(allcftables); 150 static struct cftable initcftable; 151 152 #define ROOT ((device_t)NULL) 153 154 struct matchinfo { 155 cfsubmatch_t fn; 156 device_t parent; 157 const int *locs; 158 void *aux; 159 struct cfdata *match; 160 int pri; 161 }; 162 163 struct alldevs_foray { 164 int af_s; 165 struct devicelist af_garbage; 166 }; 167 168 static char *number(char *, int); 169 static void mapply(struct matchinfo *, cfdata_t); 170 static device_t config_devalloc(const device_t, const cfdata_t, const int *); 171 static void config_devdelete(device_t); 172 static void config_devunlink(device_t, struct devicelist *); 173 static void config_makeroom(int, struct cfdriver *); 174 static void config_devlink(device_t); 175 static void config_alldevs_enter(struct alldevs_foray *); 176 static void config_alldevs_exit(struct alldevs_foray *); 177 static void config_add_attrib_dict(device_t); 178 179 static void config_collect_garbage(struct devicelist *); 180 static void config_dump_garbage(struct devicelist *); 181 182 static void pmflock_debug(device_t, const char *, int); 183 184 static device_t deviter_next1(deviter_t *); 185 static void deviter_reinit(deviter_t *); 186 187 struct deferred_config { 188 TAILQ_ENTRY(deferred_config) dc_queue; 189 device_t dc_dev; 190 void (*dc_func)(device_t); 191 }; 192 193 TAILQ_HEAD(deferred_config_head, deferred_config); 194 195 struct deferred_config_head deferred_config_queue = 196 TAILQ_HEAD_INITIALIZER(deferred_config_queue); 197 struct deferred_config_head interrupt_config_queue = 198 TAILQ_HEAD_INITIALIZER(interrupt_config_queue); 199 int interrupt_config_threads = 8; 200 struct deferred_config_head mountroot_config_queue = 201 TAILQ_HEAD_INITIALIZER(mountroot_config_queue); 202 int mountroot_config_threads = 2; 203 static lwp_t **mountroot_config_lwpids; 204 static size_t mountroot_config_lwpids_size; 205 static bool root_is_mounted = false; 206 207 static void config_process_deferred(struct deferred_config_head *, device_t); 208 209 /* Hooks to finalize configuration once all real devices have been found. */ 210 struct finalize_hook { 211 TAILQ_ENTRY(finalize_hook) f_list; 212 int (*f_func)(device_t); 213 device_t f_dev; 214 }; 215 static TAILQ_HEAD(, finalize_hook) config_finalize_list = 216 TAILQ_HEAD_INITIALIZER(config_finalize_list); 217 static int config_finalize_done; 218 219 /* list of all devices */ 220 static struct { 221 kmutex_t lock; 222 struct devicelist list; 223 devgen_t gen; 224 int nread; 225 int nwrite; 226 bool garbage; 227 } alldevs __cacheline_aligned = { 228 .list = TAILQ_HEAD_INITIALIZER(alldevs.list), 229 .gen = 1, 230 .nread = 0, 231 .nwrite = 0, 232 .garbage = false, 233 }; 234 235 static int config_pending; /* semaphore for mountroot */ 236 static kmutex_t config_misc_lock; 237 static kcondvar_t config_misc_cv; 238 239 static bool detachall = false; 240 241 #define STREQ(s1, s2) \ 242 (*(s1) == *(s2) && strcmp((s1), (s2)) == 0) 243 244 static bool config_initialized = false; /* config_init() has been called. */ 245 246 static int config_do_twiddle; 247 static callout_t config_twiddle_ch; 248 249 static void sysctl_detach_setup(struct sysctllog **); 250 251 int no_devmon_insert(const char *, prop_dictionary_t); 252 int (*devmon_insert_vec)(const char *, prop_dictionary_t) = no_devmon_insert; 253 254 typedef int (*cfdriver_fn)(struct cfdriver *); 255 static int 256 frob_cfdrivervec(struct cfdriver * const *cfdriverv, 257 cfdriver_fn drv_do, cfdriver_fn drv_undo, 258 const char *style, bool dopanic) 259 { 260 void (*pr)(const char *, ...) __printflike(1, 2) = 261 dopanic ? panic : printf; 262 int i, error = 0, e2 __diagused; 263 264 for (i = 0; cfdriverv[i] != NULL; i++) { 265 if ((error = drv_do(cfdriverv[i])) != 0) { 266 pr("configure: `%s' driver %s failed: %d", 267 cfdriverv[i]->cd_name, style, error); 268 goto bad; 269 } 270 } 271 272 KASSERT(error == 0); 273 return 0; 274 275 bad: 276 printf("\n"); 277 for (i--; i >= 0; i--) { 278 e2 = drv_undo(cfdriverv[i]); 279 KASSERT(e2 == 0); 280 } 281 282 return error; 283 } 284 285 typedef int (*cfattach_fn)(const char *, struct cfattach *); 286 static int 287 frob_cfattachvec(const struct cfattachinit *cfattachv, 288 cfattach_fn att_do, cfattach_fn att_undo, 289 const char *style, bool dopanic) 290 { 291 const struct cfattachinit *cfai = NULL; 292 void (*pr)(const char *, ...) __printflike(1, 2) = 293 dopanic ? panic : printf; 294 int j = 0, error = 0, e2 __diagused; 295 296 for (cfai = &cfattachv[0]; cfai->cfai_name != NULL; cfai++) { 297 for (j = 0; cfai->cfai_list[j] != NULL; j++) { 298 if ((error = att_do(cfai->cfai_name, 299 cfai->cfai_list[j])) != 0) { 300 pr("configure: attachment `%s' " 301 "of `%s' driver %s failed: %d", 302 cfai->cfai_list[j]->ca_name, 303 cfai->cfai_name, style, error); 304 goto bad; 305 } 306 } 307 } 308 309 KASSERT(error == 0); 310 return 0; 311 312 bad: 313 /* 314 * Rollback in reverse order. dunno if super-important, but 315 * do that anyway. Although the code looks a little like 316 * someone did a little integration (in the math sense). 317 */ 318 printf("\n"); 319 if (cfai) { 320 bool last; 321 322 for (last = false; last == false; ) { 323 if (cfai == &cfattachv[0]) 324 last = true; 325 for (j--; j >= 0; j--) { 326 e2 = att_undo(cfai->cfai_name, 327 cfai->cfai_list[j]); 328 KASSERT(e2 == 0); 329 } 330 if (!last) { 331 cfai--; 332 for (j = 0; cfai->cfai_list[j] != NULL; j++) 333 ; 334 } 335 } 336 } 337 338 return error; 339 } 340 341 /* 342 * Initialize the autoconfiguration data structures. Normally this 343 * is done by configure(), but some platforms need to do this very 344 * early (to e.g. initialize the console). 345 */ 346 void 347 config_init(void) 348 { 349 350 KASSERT(config_initialized == false); 351 352 mutex_init(&alldevs.lock, MUTEX_DEFAULT, IPL_VM); 353 354 mutex_init(&config_misc_lock, MUTEX_DEFAULT, IPL_NONE); 355 cv_init(&config_misc_cv, "cfgmisc"); 356 357 callout_init(&config_twiddle_ch, CALLOUT_MPSAFE); 358 359 frob_cfdrivervec(cfdriver_list_initial, 360 config_cfdriver_attach, NULL, "bootstrap", true); 361 frob_cfattachvec(cfattachinit, 362 config_cfattach_attach, NULL, "bootstrap", true); 363 364 initcftable.ct_cfdata = cfdata; 365 TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list); 366 367 config_initialized = true; 368 } 369 370 /* 371 * Init or fini drivers and attachments. Either all or none 372 * are processed (via rollback). It would be nice if this were 373 * atomic to outside consumers, but with the current state of 374 * locking ... 375 */ 376 int 377 config_init_component(struct cfdriver * const *cfdriverv, 378 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 379 { 380 int error; 381 382 if ((error = frob_cfdrivervec(cfdriverv, 383 config_cfdriver_attach, config_cfdriver_detach, "init", false))!= 0) 384 return error; 385 if ((error = frob_cfattachvec(cfattachv, 386 config_cfattach_attach, config_cfattach_detach, 387 "init", false)) != 0) { 388 frob_cfdrivervec(cfdriverv, 389 config_cfdriver_detach, NULL, "init rollback", true); 390 return error; 391 } 392 if ((error = config_cfdata_attach(cfdatav, 1)) != 0) { 393 frob_cfattachvec(cfattachv, 394 config_cfattach_detach, NULL, "init rollback", true); 395 frob_cfdrivervec(cfdriverv, 396 config_cfdriver_detach, NULL, "init rollback", true); 397 return error; 398 } 399 400 return 0; 401 } 402 403 int 404 config_fini_component(struct cfdriver * const *cfdriverv, 405 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 406 { 407 int error; 408 409 if ((error = config_cfdata_detach(cfdatav)) != 0) 410 return error; 411 if ((error = frob_cfattachvec(cfattachv, 412 config_cfattach_detach, config_cfattach_attach, 413 "fini", false)) != 0) { 414 if (config_cfdata_attach(cfdatav, 0) != 0) 415 panic("config_cfdata fini rollback failed"); 416 return error; 417 } 418 if ((error = frob_cfdrivervec(cfdriverv, 419 config_cfdriver_detach, config_cfdriver_attach, 420 "fini", false)) != 0) { 421 frob_cfattachvec(cfattachv, 422 config_cfattach_attach, NULL, "fini rollback", true); 423 if (config_cfdata_attach(cfdatav, 0) != 0) 424 panic("config_cfdata fini rollback failed"); 425 return error; 426 } 427 428 return 0; 429 } 430 431 void 432 config_init_mi(void) 433 { 434 435 if (!config_initialized) 436 config_init(); 437 438 sysctl_detach_setup(NULL); 439 } 440 441 void 442 config_deferred(device_t dev) 443 { 444 config_process_deferred(&deferred_config_queue, dev); 445 config_process_deferred(&interrupt_config_queue, dev); 446 config_process_deferred(&mountroot_config_queue, dev); 447 } 448 449 static void 450 config_interrupts_thread(void *cookie) 451 { 452 struct deferred_config *dc; 453 454 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 455 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 456 (*dc->dc_func)(dc->dc_dev); 457 config_pending_decr(dc->dc_dev); 458 kmem_free(dc, sizeof(*dc)); 459 } 460 kthread_exit(0); 461 } 462 463 void 464 config_create_interruptthreads(void) 465 { 466 int i; 467 468 for (i = 0; i < interrupt_config_threads; i++) { 469 (void)kthread_create(PRI_NONE, 0, NULL, 470 config_interrupts_thread, NULL, NULL, "configintr"); 471 } 472 } 473 474 static void 475 config_mountroot_thread(void *cookie) 476 { 477 struct deferred_config *dc; 478 479 while ((dc = TAILQ_FIRST(&mountroot_config_queue)) != NULL) { 480 TAILQ_REMOVE(&mountroot_config_queue, dc, dc_queue); 481 (*dc->dc_func)(dc->dc_dev); 482 kmem_free(dc, sizeof(*dc)); 483 } 484 kthread_exit(0); 485 } 486 487 void 488 config_create_mountrootthreads(void) 489 { 490 int i; 491 492 if (!root_is_mounted) 493 root_is_mounted = true; 494 495 mountroot_config_lwpids_size = sizeof(mountroot_config_lwpids) * 496 mountroot_config_threads; 497 mountroot_config_lwpids = kmem_alloc(mountroot_config_lwpids_size, 498 KM_NOSLEEP); 499 KASSERT(mountroot_config_lwpids); 500 for (i = 0; i < mountroot_config_threads; i++) { 501 mountroot_config_lwpids[i] = 0; 502 (void)kthread_create(PRI_NONE, KTHREAD_MUSTJOIN, NULL, 503 config_mountroot_thread, NULL, 504 &mountroot_config_lwpids[i], 505 "configroot"); 506 } 507 } 508 509 void 510 config_finalize_mountroot(void) 511 { 512 int i, error; 513 514 for (i = 0; i < mountroot_config_threads; i++) { 515 if (mountroot_config_lwpids[i] == 0) 516 continue; 517 518 error = kthread_join(mountroot_config_lwpids[i]); 519 if (error) 520 printf("%s: thread %x joined with error %d\n", 521 __func__, i, error); 522 } 523 kmem_free(mountroot_config_lwpids, mountroot_config_lwpids_size); 524 } 525 526 /* 527 * Announce device attach/detach to userland listeners. 528 */ 529 530 int 531 no_devmon_insert(const char *name, prop_dictionary_t p) 532 { 533 534 return ENODEV; 535 } 536 537 static void 538 devmon_report_device(device_t dev, bool isattach) 539 { 540 prop_dictionary_t ev; 541 const char *parent; 542 const char *what; 543 device_t pdev = device_parent(dev); 544 545 /* If currently no drvctl device, just return */ 546 if (devmon_insert_vec == no_devmon_insert) 547 return; 548 549 ev = prop_dictionary_create(); 550 if (ev == NULL) 551 return; 552 553 what = (isattach ? "device-attach" : "device-detach"); 554 parent = (pdev == NULL ? "root" : device_xname(pdev)); 555 if (!prop_dictionary_set_cstring(ev, "device", device_xname(dev)) || 556 !prop_dictionary_set_cstring(ev, "parent", parent)) { 557 prop_object_release(ev); 558 return; 559 } 560 561 if ((*devmon_insert_vec)(what, ev) != 0) 562 prop_object_release(ev); 563 } 564 565 /* 566 * Add a cfdriver to the system. 567 */ 568 int 569 config_cfdriver_attach(struct cfdriver *cd) 570 { 571 struct cfdriver *lcd; 572 573 /* Make sure this driver isn't already in the system. */ 574 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 575 if (STREQ(lcd->cd_name, cd->cd_name)) 576 return EEXIST; 577 } 578 579 LIST_INIT(&cd->cd_attach); 580 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 581 582 return 0; 583 } 584 585 /* 586 * Remove a cfdriver from the system. 587 */ 588 int 589 config_cfdriver_detach(struct cfdriver *cd) 590 { 591 struct alldevs_foray af; 592 int i, rc = 0; 593 594 config_alldevs_enter(&af); 595 /* Make sure there are no active instances. */ 596 for (i = 0; i < cd->cd_ndevs; i++) { 597 if (cd->cd_devs[i] != NULL) { 598 rc = EBUSY; 599 break; 600 } 601 } 602 config_alldevs_exit(&af); 603 604 if (rc != 0) 605 return rc; 606 607 /* ...and no attachments loaded. */ 608 if (LIST_EMPTY(&cd->cd_attach) == 0) 609 return EBUSY; 610 611 LIST_REMOVE(cd, cd_list); 612 613 KASSERT(cd->cd_devs == NULL); 614 615 return 0; 616 } 617 618 /* 619 * Look up a cfdriver by name. 620 */ 621 struct cfdriver * 622 config_cfdriver_lookup(const char *name) 623 { 624 struct cfdriver *cd; 625 626 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 627 if (STREQ(cd->cd_name, name)) 628 return cd; 629 } 630 631 return NULL; 632 } 633 634 /* 635 * Add a cfattach to the specified driver. 636 */ 637 int 638 config_cfattach_attach(const char *driver, struct cfattach *ca) 639 { 640 struct cfattach *lca; 641 struct cfdriver *cd; 642 643 cd = config_cfdriver_lookup(driver); 644 if (cd == NULL) 645 return ESRCH; 646 647 /* Make sure this attachment isn't already on this driver. */ 648 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 649 if (STREQ(lca->ca_name, ca->ca_name)) 650 return EEXIST; 651 } 652 653 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 654 655 return 0; 656 } 657 658 /* 659 * Remove a cfattach from the specified driver. 660 */ 661 int 662 config_cfattach_detach(const char *driver, struct cfattach *ca) 663 { 664 struct alldevs_foray af; 665 struct cfdriver *cd; 666 device_t dev; 667 int i, rc = 0; 668 669 cd = config_cfdriver_lookup(driver); 670 if (cd == NULL) 671 return ESRCH; 672 673 config_alldevs_enter(&af); 674 /* Make sure there are no active instances. */ 675 for (i = 0; i < cd->cd_ndevs; i++) { 676 if ((dev = cd->cd_devs[i]) == NULL) 677 continue; 678 if (dev->dv_cfattach == ca) { 679 rc = EBUSY; 680 break; 681 } 682 } 683 config_alldevs_exit(&af); 684 685 if (rc != 0) 686 return rc; 687 688 LIST_REMOVE(ca, ca_list); 689 690 return 0; 691 } 692 693 /* 694 * Look up a cfattach by name. 695 */ 696 static struct cfattach * 697 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 698 { 699 struct cfattach *ca; 700 701 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 702 if (STREQ(ca->ca_name, atname)) 703 return ca; 704 } 705 706 return NULL; 707 } 708 709 /* 710 * Look up a cfattach by driver/attachment name. 711 */ 712 struct cfattach * 713 config_cfattach_lookup(const char *name, const char *atname) 714 { 715 struct cfdriver *cd; 716 717 cd = config_cfdriver_lookup(name); 718 if (cd == NULL) 719 return NULL; 720 721 return config_cfattach_lookup_cd(cd, atname); 722 } 723 724 /* 725 * Apply the matching function and choose the best. This is used 726 * a few times and we want to keep the code small. 727 */ 728 static void 729 mapply(struct matchinfo *m, cfdata_t cf) 730 { 731 int pri; 732 733 if (m->fn != NULL) { 734 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 735 } else { 736 pri = config_match(m->parent, cf, m->aux); 737 } 738 if (pri > m->pri) { 739 m->match = cf; 740 m->pri = pri; 741 } 742 } 743 744 int 745 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 746 { 747 const struct cfiattrdata *ci; 748 const struct cflocdesc *cl; 749 int nlocs, i; 750 751 ci = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 752 KASSERT(ci); 753 nlocs = ci->ci_loclen; 754 KASSERT(!nlocs || locs); 755 for (i = 0; i < nlocs; i++) { 756 cl = &ci->ci_locdesc[i]; 757 if (cl->cld_defaultstr != NULL && 758 cf->cf_loc[i] == cl->cld_default) 759 continue; 760 if (cf->cf_loc[i] == locs[i]) 761 continue; 762 return 0; 763 } 764 765 return config_match(parent, cf, aux); 766 } 767 768 /* 769 * Helper function: check whether the driver supports the interface attribute 770 * and return its descriptor structure. 771 */ 772 static const struct cfiattrdata * 773 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 774 { 775 const struct cfiattrdata * const *cpp; 776 777 if (cd->cd_attrs == NULL) 778 return 0; 779 780 for (cpp = cd->cd_attrs; *cpp; cpp++) { 781 if (STREQ((*cpp)->ci_name, ia)) { 782 /* Match. */ 783 return *cpp; 784 } 785 } 786 return 0; 787 } 788 789 /* 790 * Lookup an interface attribute description by name. 791 * If the driver is given, consider only its supported attributes. 792 */ 793 const struct cfiattrdata * 794 cfiattr_lookup(const char *name, const struct cfdriver *cd) 795 { 796 const struct cfdriver *d; 797 const struct cfiattrdata *ia; 798 799 if (cd) 800 return cfdriver_get_iattr(cd, name); 801 802 LIST_FOREACH(d, &allcfdrivers, cd_list) { 803 ia = cfdriver_get_iattr(d, name); 804 if (ia) 805 return ia; 806 } 807 return 0; 808 } 809 810 /* 811 * Determine if `parent' is a potential parent for a device spec based 812 * on `cfp'. 813 */ 814 static int 815 cfparent_match(const device_t parent, const struct cfparent *cfp) 816 { 817 struct cfdriver *pcd; 818 819 /* We don't match root nodes here. */ 820 if (cfp == NULL) 821 return 0; 822 823 pcd = parent->dv_cfdriver; 824 KASSERT(pcd != NULL); 825 826 /* 827 * First, ensure this parent has the correct interface 828 * attribute. 829 */ 830 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 831 return 0; 832 833 /* 834 * If no specific parent device instance was specified (i.e. 835 * we're attaching to the attribute only), we're done! 836 */ 837 if (cfp->cfp_parent == NULL) 838 return 1; 839 840 /* 841 * Check the parent device's name. 842 */ 843 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 844 return 0; /* not the same parent */ 845 846 /* 847 * Make sure the unit number matches. 848 */ 849 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 850 cfp->cfp_unit == parent->dv_unit) 851 return 1; 852 853 /* Unit numbers don't match. */ 854 return 0; 855 } 856 857 /* 858 * Helper for config_cfdata_attach(): check all devices whether it could be 859 * parent any attachment in the config data table passed, and rescan. 860 */ 861 static void 862 rescan_with_cfdata(const struct cfdata *cf) 863 { 864 device_t d; 865 const struct cfdata *cf1; 866 deviter_t di; 867 868 869 /* 870 * "alldevs" is likely longer than a modules's cfdata, so make it 871 * the outer loop. 872 */ 873 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 874 875 if (!(d->dv_cfattach->ca_rescan)) 876 continue; 877 878 for (cf1 = cf; cf1->cf_name; cf1++) { 879 880 if (!cfparent_match(d, cf1->cf_pspec)) 881 continue; 882 883 (*d->dv_cfattach->ca_rescan)(d, 884 cfdata_ifattr(cf1), cf1->cf_loc); 885 886 config_deferred(d); 887 } 888 } 889 deviter_release(&di); 890 } 891 892 /* 893 * Attach a supplemental config data table and rescan potential 894 * parent devices if required. 895 */ 896 int 897 config_cfdata_attach(cfdata_t cf, int scannow) 898 { 899 struct cftable *ct; 900 901 ct = kmem_alloc(sizeof(*ct), KM_SLEEP); 902 ct->ct_cfdata = cf; 903 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 904 905 if (scannow) 906 rescan_with_cfdata(cf); 907 908 return 0; 909 } 910 911 /* 912 * Helper for config_cfdata_detach: check whether a device is 913 * found through any attachment in the config data table. 914 */ 915 static int 916 dev_in_cfdata(device_t d, cfdata_t cf) 917 { 918 const struct cfdata *cf1; 919 920 for (cf1 = cf; cf1->cf_name; cf1++) 921 if (d->dv_cfdata == cf1) 922 return 1; 923 924 return 0; 925 } 926 927 /* 928 * Detach a supplemental config data table. Detach all devices found 929 * through that table (and thus keeping references to it) before. 930 */ 931 int 932 config_cfdata_detach(cfdata_t cf) 933 { 934 device_t d; 935 int error = 0; 936 struct cftable *ct; 937 deviter_t di; 938 939 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 940 d = deviter_next(&di)) { 941 if (!dev_in_cfdata(d, cf)) 942 continue; 943 if ((error = config_detach(d, 0)) != 0) 944 break; 945 } 946 deviter_release(&di); 947 if (error) { 948 aprint_error_dev(d, "unable to detach instance\n"); 949 return error; 950 } 951 952 TAILQ_FOREACH(ct, &allcftables, ct_list) { 953 if (ct->ct_cfdata == cf) { 954 TAILQ_REMOVE(&allcftables, ct, ct_list); 955 kmem_free(ct, sizeof(*ct)); 956 return 0; 957 } 958 } 959 960 /* not found -- shouldn't happen */ 961 return EINVAL; 962 } 963 964 /* 965 * Invoke the "match" routine for a cfdata entry on behalf of 966 * an external caller, usually a "submatch" routine. 967 */ 968 int 969 config_match(device_t parent, cfdata_t cf, void *aux) 970 { 971 struct cfattach *ca; 972 973 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 974 if (ca == NULL) { 975 /* No attachment for this entry, oh well. */ 976 return 0; 977 } 978 979 return (*ca->ca_match)(parent, cf, aux); 980 } 981 982 /* 983 * Iterate over all potential children of some device, calling the given 984 * function (default being the child's match function) for each one. 985 * Nonzero returns are matches; the highest value returned is considered 986 * the best match. Return the `found child' if we got a match, or NULL 987 * otherwise. The `aux' pointer is simply passed on through. 988 * 989 * Note that this function is designed so that it can be used to apply 990 * an arbitrary function to all potential children (its return value 991 * can be ignored). 992 */ 993 cfdata_t 994 config_search_loc(cfsubmatch_t fn, device_t parent, 995 const char *ifattr, const int *locs, void *aux) 996 { 997 struct cftable *ct; 998 cfdata_t cf; 999 struct matchinfo m; 1000 1001 KASSERT(config_initialized); 1002 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 1003 1004 m.fn = fn; 1005 m.parent = parent; 1006 m.locs = locs; 1007 m.aux = aux; 1008 m.match = NULL; 1009 m.pri = 0; 1010 1011 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1012 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1013 1014 /* We don't match root nodes here. */ 1015 if (!cf->cf_pspec) 1016 continue; 1017 1018 /* 1019 * Skip cf if no longer eligible, otherwise scan 1020 * through parents for one matching `parent', and 1021 * try match function. 1022 */ 1023 if (cf->cf_fstate == FSTATE_FOUND) 1024 continue; 1025 if (cf->cf_fstate == FSTATE_DNOTFOUND || 1026 cf->cf_fstate == FSTATE_DSTAR) 1027 continue; 1028 1029 /* 1030 * If an interface attribute was specified, 1031 * consider only children which attach to 1032 * that attribute. 1033 */ 1034 if (ifattr && !STREQ(ifattr, cfdata_ifattr(cf))) 1035 continue; 1036 1037 if (cfparent_match(parent, cf->cf_pspec)) 1038 mapply(&m, cf); 1039 } 1040 } 1041 return m.match; 1042 } 1043 1044 cfdata_t 1045 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 1046 void *aux) 1047 { 1048 1049 return config_search_loc(fn, parent, ifattr, NULL, aux); 1050 } 1051 1052 /* 1053 * Find the given root device. 1054 * This is much like config_search, but there is no parent. 1055 * Don't bother with multiple cfdata tables; the root node 1056 * must always be in the initial table. 1057 */ 1058 cfdata_t 1059 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 1060 { 1061 cfdata_t cf; 1062 const short *p; 1063 struct matchinfo m; 1064 1065 m.fn = fn; 1066 m.parent = ROOT; 1067 m.aux = aux; 1068 m.match = NULL; 1069 m.pri = 0; 1070 m.locs = 0; 1071 /* 1072 * Look at root entries for matching name. We do not bother 1073 * with found-state here since only one root should ever be 1074 * searched (and it must be done first). 1075 */ 1076 for (p = cfroots; *p >= 0; p++) { 1077 cf = &cfdata[*p]; 1078 if (strcmp(cf->cf_name, rootname) == 0) 1079 mapply(&m, cf); 1080 } 1081 return m.match; 1082 } 1083 1084 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 1085 1086 /* 1087 * The given `aux' argument describes a device that has been found 1088 * on the given parent, but not necessarily configured. Locate the 1089 * configuration data for that device (using the submatch function 1090 * provided, or using candidates' cd_match configuration driver 1091 * functions) and attach it, and return its device_t. If the device was 1092 * not configured, call the given `print' function and return NULL. 1093 */ 1094 device_t 1095 config_found_sm_loc(device_t parent, 1096 const char *ifattr, const int *locs, void *aux, 1097 cfprint_t print, cfsubmatch_t submatch) 1098 { 1099 cfdata_t cf; 1100 1101 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 1102 return(config_attach_loc(parent, cf, locs, aux, print)); 1103 if (print) { 1104 if (config_do_twiddle && cold) 1105 twiddle(); 1106 aprint_normal("%s", msgs[(*print)(aux, device_xname(parent))]); 1107 } 1108 1109 /* 1110 * This has the effect of mixing in a single timestamp to the 1111 * entropy pool. Experiments indicate the estimator will almost 1112 * always attribute one bit of entropy to this sample; analysis 1113 * of device attach/detach timestamps on FreeBSD indicates 4 1114 * bits of entropy/sample so this seems appropriately conservative. 1115 */ 1116 rnd_add_uint32(&rnd_autoconf_source, 0); 1117 return NULL; 1118 } 1119 1120 device_t 1121 config_found_ia(device_t parent, const char *ifattr, void *aux, 1122 cfprint_t print) 1123 { 1124 1125 return config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL); 1126 } 1127 1128 device_t 1129 config_found(device_t parent, void *aux, cfprint_t print) 1130 { 1131 1132 return config_found_sm_loc(parent, NULL, NULL, aux, print, NULL); 1133 } 1134 1135 /* 1136 * As above, but for root devices. 1137 */ 1138 device_t 1139 config_rootfound(const char *rootname, void *aux) 1140 { 1141 cfdata_t cf; 1142 1143 if ((cf = config_rootsearch(NULL, rootname, aux)) != NULL) 1144 return config_attach(ROOT, cf, aux, NULL); 1145 aprint_error("root device %s not configured\n", rootname); 1146 return NULL; 1147 } 1148 1149 /* just like sprintf(buf, "%d") except that it works from the end */ 1150 static char * 1151 number(char *ep, int n) 1152 { 1153 1154 *--ep = 0; 1155 while (n >= 10) { 1156 *--ep = (n % 10) + '0'; 1157 n /= 10; 1158 } 1159 *--ep = n + '0'; 1160 return ep; 1161 } 1162 1163 /* 1164 * Expand the size of the cd_devs array if necessary. 1165 * 1166 * The caller must hold alldevs.lock. config_makeroom() may release and 1167 * re-acquire alldevs.lock, so callers should re-check conditions such 1168 * as alldevs.nwrite == 0 and alldevs.nread == 0 when config_makeroom() 1169 * returns. 1170 */ 1171 static void 1172 config_makeroom(int n, struct cfdriver *cd) 1173 { 1174 int ondevs, nndevs; 1175 device_t *osp, *nsp; 1176 1177 KASSERT(mutex_owned(&alldevs.lock)); 1178 alldevs.nwrite++; 1179 1180 for (nndevs = MAX(4, cd->cd_ndevs); nndevs <= n; nndevs += nndevs) 1181 ; 1182 1183 while (n >= cd->cd_ndevs) { 1184 /* 1185 * Need to expand the array. 1186 */ 1187 ondevs = cd->cd_ndevs; 1188 osp = cd->cd_devs; 1189 1190 /* 1191 * Release alldevs.lock around allocation, which may 1192 * sleep. 1193 */ 1194 mutex_exit(&alldevs.lock); 1195 nsp = kmem_alloc(sizeof(device_t[nndevs]), KM_SLEEP); 1196 if (nsp == NULL) 1197 panic("%s: could not expand cd_devs", __func__); 1198 mutex_enter(&alldevs.lock); 1199 1200 /* 1201 * If another thread moved the array while we did 1202 * not hold alldevs.lock, try again. 1203 */ 1204 if (cd->cd_devs != osp) { 1205 mutex_exit(&alldevs.lock); 1206 kmem_free(nsp, sizeof(device_t[nndevs])); 1207 mutex_enter(&alldevs.lock); 1208 continue; 1209 } 1210 1211 memset(nsp + ondevs, 0, sizeof(device_t[nndevs - ondevs])); 1212 if (ondevs != 0) 1213 memcpy(nsp, cd->cd_devs, sizeof(device_t[ondevs])); 1214 1215 cd->cd_ndevs = nndevs; 1216 cd->cd_devs = nsp; 1217 if (ondevs != 0) { 1218 mutex_exit(&alldevs.lock); 1219 kmem_free(osp, sizeof(device_t[ondevs])); 1220 mutex_enter(&alldevs.lock); 1221 } 1222 } 1223 KASSERT(mutex_owned(&alldevs.lock)); 1224 alldevs.nwrite--; 1225 } 1226 1227 /* 1228 * Put dev into the devices list. 1229 */ 1230 static void 1231 config_devlink(device_t dev) 1232 { 1233 1234 mutex_enter(&alldevs.lock); 1235 1236 KASSERT(device_cfdriver(dev)->cd_devs[dev->dv_unit] == dev); 1237 1238 dev->dv_add_gen = alldevs.gen; 1239 /* It is safe to add a device to the tail of the list while 1240 * readers and writers are in the list. 1241 */ 1242 TAILQ_INSERT_TAIL(&alldevs.list, dev, dv_list); 1243 mutex_exit(&alldevs.lock); 1244 } 1245 1246 static void 1247 config_devfree(device_t dev) 1248 { 1249 int priv = (dev->dv_flags & DVF_PRIV_ALLOC); 1250 1251 if (dev->dv_cfattach->ca_devsize > 0) 1252 kmem_free(dev->dv_private, dev->dv_cfattach->ca_devsize); 1253 if (priv) 1254 kmem_free(dev, sizeof(*dev)); 1255 } 1256 1257 /* 1258 * Caller must hold alldevs.lock. 1259 */ 1260 static void 1261 config_devunlink(device_t dev, struct devicelist *garbage) 1262 { 1263 struct device_garbage *dg = &dev->dv_garbage; 1264 cfdriver_t cd = device_cfdriver(dev); 1265 int i; 1266 1267 KASSERT(mutex_owned(&alldevs.lock)); 1268 1269 /* Unlink from device list. Link to garbage list. */ 1270 TAILQ_REMOVE(&alldevs.list, dev, dv_list); 1271 TAILQ_INSERT_TAIL(garbage, dev, dv_list); 1272 1273 /* Remove from cfdriver's array. */ 1274 cd->cd_devs[dev->dv_unit] = NULL; 1275 1276 /* 1277 * If the device now has no units in use, unlink its softc array. 1278 */ 1279 for (i = 0; i < cd->cd_ndevs; i++) { 1280 if (cd->cd_devs[i] != NULL) 1281 break; 1282 } 1283 /* Nothing found. Unlink, now. Deallocate, later. */ 1284 if (i == cd->cd_ndevs) { 1285 dg->dg_ndevs = cd->cd_ndevs; 1286 dg->dg_devs = cd->cd_devs; 1287 cd->cd_devs = NULL; 1288 cd->cd_ndevs = 0; 1289 } 1290 } 1291 1292 static void 1293 config_devdelete(device_t dev) 1294 { 1295 struct device_garbage *dg = &dev->dv_garbage; 1296 device_lock_t dvl = device_getlock(dev); 1297 1298 if (dg->dg_devs != NULL) 1299 kmem_free(dg->dg_devs, sizeof(device_t[dg->dg_ndevs])); 1300 1301 cv_destroy(&dvl->dvl_cv); 1302 mutex_destroy(&dvl->dvl_mtx); 1303 1304 KASSERT(dev->dv_properties != NULL); 1305 prop_object_release(dev->dv_properties); 1306 1307 if (dev->dv_activity_handlers) 1308 panic("%s with registered handlers", __func__); 1309 1310 if (dev->dv_locators) { 1311 size_t amount = *--dev->dv_locators; 1312 kmem_free(dev->dv_locators, amount); 1313 } 1314 1315 config_devfree(dev); 1316 } 1317 1318 static int 1319 config_unit_nextfree(cfdriver_t cd, cfdata_t cf) 1320 { 1321 int unit; 1322 1323 if (cf->cf_fstate == FSTATE_STAR) { 1324 for (unit = cf->cf_unit; unit < cd->cd_ndevs; unit++) 1325 if (cd->cd_devs[unit] == NULL) 1326 break; 1327 /* 1328 * unit is now the unit of the first NULL device pointer, 1329 * or max(cd->cd_ndevs,cf->cf_unit). 1330 */ 1331 } else { 1332 unit = cf->cf_unit; 1333 if (unit < cd->cd_ndevs && cd->cd_devs[unit] != NULL) 1334 unit = -1; 1335 } 1336 return unit; 1337 } 1338 1339 static int 1340 config_unit_alloc(device_t dev, cfdriver_t cd, cfdata_t cf) 1341 { 1342 struct alldevs_foray af; 1343 int unit; 1344 1345 config_alldevs_enter(&af); 1346 for (;;) { 1347 unit = config_unit_nextfree(cd, cf); 1348 if (unit == -1) 1349 break; 1350 if (unit < cd->cd_ndevs) { 1351 cd->cd_devs[unit] = dev; 1352 dev->dv_unit = unit; 1353 break; 1354 } 1355 config_makeroom(unit, cd); 1356 } 1357 config_alldevs_exit(&af); 1358 1359 return unit; 1360 } 1361 1362 static device_t 1363 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1364 { 1365 cfdriver_t cd; 1366 cfattach_t ca; 1367 size_t lname, lunit; 1368 const char *xunit; 1369 int myunit; 1370 char num[10]; 1371 device_t dev; 1372 void *dev_private; 1373 const struct cfiattrdata *ia; 1374 device_lock_t dvl; 1375 1376 cd = config_cfdriver_lookup(cf->cf_name); 1377 if (cd == NULL) 1378 return NULL; 1379 1380 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1381 if (ca == NULL) 1382 return NULL; 1383 1384 /* get memory for all device vars */ 1385 KASSERTMSG((ca->ca_flags & DVF_PRIV_ALLOC) 1386 || ca->ca_devsize >= sizeof(struct device), 1387 "%s: %s (%zu < %zu)", __func__, cf->cf_atname, ca->ca_devsize, 1388 sizeof(struct device)); 1389 if (ca->ca_devsize > 0) { 1390 dev_private = kmem_zalloc(ca->ca_devsize, KM_SLEEP); 1391 if (dev_private == NULL) 1392 panic("config_devalloc: memory allocation for device " 1393 "softc failed"); 1394 } else { 1395 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1396 dev_private = NULL; 1397 } 1398 1399 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1400 dev = kmem_zalloc(sizeof(*dev), KM_SLEEP); 1401 } else { 1402 dev = dev_private; 1403 #ifdef DIAGNOSTIC 1404 printf("%s has not been converted to device_t\n", cd->cd_name); 1405 #endif 1406 } 1407 if (dev == NULL) 1408 panic("config_devalloc: memory allocation for device_t failed"); 1409 1410 dev->dv_class = cd->cd_class; 1411 dev->dv_cfdata = cf; 1412 dev->dv_cfdriver = cd; 1413 dev->dv_cfattach = ca; 1414 dev->dv_activity_count = 0; 1415 dev->dv_activity_handlers = NULL; 1416 dev->dv_private = dev_private; 1417 dev->dv_flags = ca->ca_flags; /* inherit flags from class */ 1418 1419 myunit = config_unit_alloc(dev, cd, cf); 1420 if (myunit == -1) { 1421 config_devfree(dev); 1422 return NULL; 1423 } 1424 1425 /* compute length of name and decimal expansion of unit number */ 1426 lname = strlen(cd->cd_name); 1427 xunit = number(&num[sizeof(num)], myunit); 1428 lunit = &num[sizeof(num)] - xunit; 1429 if (lname + lunit > sizeof(dev->dv_xname)) 1430 panic("config_devalloc: device name too long"); 1431 1432 dvl = device_getlock(dev); 1433 1434 mutex_init(&dvl->dvl_mtx, MUTEX_DEFAULT, IPL_NONE); 1435 cv_init(&dvl->dvl_cv, "pmfsusp"); 1436 1437 memcpy(dev->dv_xname, cd->cd_name, lname); 1438 memcpy(dev->dv_xname + lname, xunit, lunit); 1439 dev->dv_parent = parent; 1440 if (parent != NULL) 1441 dev->dv_depth = parent->dv_depth + 1; 1442 else 1443 dev->dv_depth = 0; 1444 dev->dv_flags |= DVF_ACTIVE; /* always initially active */ 1445 if (locs) { 1446 KASSERT(parent); /* no locators at root */ 1447 ia = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 1448 dev->dv_locators = 1449 kmem_alloc(sizeof(int [ia->ci_loclen + 1]), KM_SLEEP); 1450 *dev->dv_locators++ = sizeof(int [ia->ci_loclen + 1]); 1451 memcpy(dev->dv_locators, locs, sizeof(int [ia->ci_loclen])); 1452 } 1453 dev->dv_properties = prop_dictionary_create(); 1454 KASSERT(dev->dv_properties != NULL); 1455 1456 prop_dictionary_set_cstring_nocopy(dev->dv_properties, 1457 "device-driver", dev->dv_cfdriver->cd_name); 1458 prop_dictionary_set_uint16(dev->dv_properties, 1459 "device-unit", dev->dv_unit); 1460 if (parent != NULL) { 1461 prop_dictionary_set_cstring(dev->dv_properties, 1462 "device-parent", device_xname(parent)); 1463 } 1464 1465 if (dev->dv_cfdriver->cd_attrs != NULL) 1466 config_add_attrib_dict(dev); 1467 1468 return dev; 1469 } 1470 1471 /* 1472 * Create an array of device attach attributes and add it 1473 * to the device's dv_properties dictionary. 1474 * 1475 * <key>interface-attributes</key> 1476 * <array> 1477 * <dict> 1478 * <key>attribute-name</key> 1479 * <string>foo</string> 1480 * <key>locators</key> 1481 * <array> 1482 * <dict> 1483 * <key>loc-name</key> 1484 * <string>foo-loc1</string> 1485 * </dict> 1486 * <dict> 1487 * <key>loc-name</key> 1488 * <string>foo-loc2</string> 1489 * <key>default</key> 1490 * <string>foo-loc2-default</string> 1491 * </dict> 1492 * ... 1493 * </array> 1494 * </dict> 1495 * ... 1496 * </array> 1497 */ 1498 1499 static void 1500 config_add_attrib_dict(device_t dev) 1501 { 1502 int i, j; 1503 const struct cfiattrdata *ci; 1504 prop_dictionary_t attr_dict, loc_dict; 1505 prop_array_t attr_array, loc_array; 1506 1507 if ((attr_array = prop_array_create()) == NULL) 1508 return; 1509 1510 for (i = 0; ; i++) { 1511 if ((ci = dev->dv_cfdriver->cd_attrs[i]) == NULL) 1512 break; 1513 if ((attr_dict = prop_dictionary_create()) == NULL) 1514 break; 1515 prop_dictionary_set_cstring_nocopy(attr_dict, "attribute-name", 1516 ci->ci_name); 1517 1518 /* Create an array of the locator names and defaults */ 1519 1520 if (ci->ci_loclen != 0 && 1521 (loc_array = prop_array_create()) != NULL) { 1522 for (j = 0; j < ci->ci_loclen; j++) { 1523 loc_dict = prop_dictionary_create(); 1524 if (loc_dict == NULL) 1525 continue; 1526 prop_dictionary_set_cstring_nocopy(loc_dict, 1527 "loc-name", ci->ci_locdesc[j].cld_name); 1528 if (ci->ci_locdesc[j].cld_defaultstr != NULL) 1529 prop_dictionary_set_cstring_nocopy( 1530 loc_dict, "default", 1531 ci->ci_locdesc[j].cld_defaultstr); 1532 prop_array_set(loc_array, j, loc_dict); 1533 prop_object_release(loc_dict); 1534 } 1535 prop_dictionary_set_and_rel(attr_dict, "locators", 1536 loc_array); 1537 } 1538 prop_array_add(attr_array, attr_dict); 1539 prop_object_release(attr_dict); 1540 } 1541 if (i == 0) 1542 prop_object_release(attr_array); 1543 else 1544 prop_dictionary_set_and_rel(dev->dv_properties, 1545 "interface-attributes", attr_array); 1546 1547 return; 1548 } 1549 1550 /* 1551 * Attach a found device. 1552 */ 1553 device_t 1554 config_attach_loc(device_t parent, cfdata_t cf, 1555 const int *locs, void *aux, cfprint_t print) 1556 { 1557 device_t dev; 1558 struct cftable *ct; 1559 const char *drvname; 1560 1561 dev = config_devalloc(parent, cf, locs); 1562 if (!dev) 1563 panic("config_attach: allocation of device softc failed"); 1564 1565 /* XXX redundant - see below? */ 1566 if (cf->cf_fstate != FSTATE_STAR) { 1567 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1568 cf->cf_fstate = FSTATE_FOUND; 1569 } 1570 1571 config_devlink(dev); 1572 1573 if (config_do_twiddle && cold) 1574 twiddle(); 1575 else 1576 aprint_naive("Found "); 1577 /* 1578 * We want the next two printfs for normal, verbose, and quiet, 1579 * but not silent (in which case, we're twiddling, instead). 1580 */ 1581 if (parent == ROOT) { 1582 aprint_naive("%s (root)", device_xname(dev)); 1583 aprint_normal("%s (root)", device_xname(dev)); 1584 } else { 1585 aprint_naive("%s at %s", device_xname(dev), 1586 device_xname(parent)); 1587 aprint_normal("%s at %s", device_xname(dev), 1588 device_xname(parent)); 1589 if (print) 1590 (void) (*print)(aux, NULL); 1591 } 1592 1593 /* 1594 * Before attaching, clobber any unfound devices that are 1595 * otherwise identical. 1596 * XXX code above is redundant? 1597 */ 1598 drvname = dev->dv_cfdriver->cd_name; 1599 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1600 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1601 if (STREQ(cf->cf_name, drvname) && 1602 cf->cf_unit == dev->dv_unit) { 1603 if (cf->cf_fstate == FSTATE_NOTFOUND) 1604 cf->cf_fstate = FSTATE_FOUND; 1605 } 1606 } 1607 } 1608 device_register(dev, aux); 1609 1610 /* Let userland know */ 1611 devmon_report_device(dev, true); 1612 1613 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1614 1615 if (!device_pmf_is_registered(dev)) 1616 aprint_debug_dev(dev, "WARNING: power management not " 1617 "supported\n"); 1618 1619 config_process_deferred(&deferred_config_queue, dev); 1620 1621 device_register_post_config(dev, aux); 1622 return dev; 1623 } 1624 1625 device_t 1626 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1627 { 1628 1629 return config_attach_loc(parent, cf, NULL, aux, print); 1630 } 1631 1632 /* 1633 * As above, but for pseudo-devices. Pseudo-devices attached in this 1634 * way are silently inserted into the device tree, and their children 1635 * attached. 1636 * 1637 * Note that because pseudo-devices are attached silently, any information 1638 * the attach routine wishes to print should be prefixed with the device 1639 * name by the attach routine. 1640 */ 1641 device_t 1642 config_attach_pseudo(cfdata_t cf) 1643 { 1644 device_t dev; 1645 1646 dev = config_devalloc(ROOT, cf, NULL); 1647 if (!dev) 1648 return NULL; 1649 1650 /* XXX mark busy in cfdata */ 1651 1652 if (cf->cf_fstate != FSTATE_STAR) { 1653 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1654 cf->cf_fstate = FSTATE_FOUND; 1655 } 1656 1657 config_devlink(dev); 1658 1659 #if 0 /* XXXJRT not yet */ 1660 device_register(dev, NULL); /* like a root node */ 1661 #endif 1662 1663 /* Let userland know */ 1664 devmon_report_device(dev, true); 1665 1666 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1667 1668 config_process_deferred(&deferred_config_queue, dev); 1669 return dev; 1670 } 1671 1672 /* 1673 * Caller must hold alldevs.lock. 1674 */ 1675 static void 1676 config_collect_garbage(struct devicelist *garbage) 1677 { 1678 device_t dv; 1679 1680 KASSERT(!cpu_intr_p()); 1681 KASSERT(!cpu_softintr_p()); 1682 KASSERT(mutex_owned(&alldevs.lock)); 1683 1684 while (alldevs.nwrite == 0 && alldevs.nread == 0 && alldevs.garbage) { 1685 TAILQ_FOREACH(dv, &alldevs.list, dv_list) { 1686 if (dv->dv_del_gen != 0) 1687 break; 1688 } 1689 if (dv == NULL) { 1690 alldevs.garbage = false; 1691 break; 1692 } 1693 config_devunlink(dv, garbage); 1694 } 1695 KASSERT(mutex_owned(&alldevs.lock)); 1696 } 1697 1698 static void 1699 config_dump_garbage(struct devicelist *garbage) 1700 { 1701 device_t dv; 1702 1703 while ((dv = TAILQ_FIRST(garbage)) != NULL) { 1704 TAILQ_REMOVE(garbage, dv, dv_list); 1705 config_devdelete(dv); 1706 } 1707 } 1708 1709 /* 1710 * Detach a device. Optionally forced (e.g. because of hardware 1711 * removal) and quiet. Returns zero if successful, non-zero 1712 * (an error code) otherwise. 1713 * 1714 * Note that this code wants to be run from a process context, so 1715 * that the detach can sleep to allow processes which have a device 1716 * open to run and unwind their stacks. 1717 */ 1718 int 1719 config_detach(device_t dev, int flags) 1720 { 1721 struct alldevs_foray af; 1722 struct cftable *ct; 1723 cfdata_t cf; 1724 const struct cfattach *ca; 1725 struct cfdriver *cd; 1726 #ifdef DIAGNOSTIC 1727 device_t d; 1728 #endif 1729 int rv = 0; 1730 1731 #ifdef DIAGNOSTIC 1732 cf = dev->dv_cfdata; 1733 if (cf != NULL && cf->cf_fstate != FSTATE_FOUND && 1734 cf->cf_fstate != FSTATE_STAR) 1735 panic("config_detach: %s: bad device fstate %d", 1736 device_xname(dev), cf ? cf->cf_fstate : -1); 1737 #endif 1738 cd = dev->dv_cfdriver; 1739 KASSERT(cd != NULL); 1740 1741 ca = dev->dv_cfattach; 1742 KASSERT(ca != NULL); 1743 1744 mutex_enter(&alldevs.lock); 1745 if (dev->dv_del_gen != 0) { 1746 mutex_exit(&alldevs.lock); 1747 #ifdef DIAGNOSTIC 1748 printf("%s: %s is already detached\n", __func__, 1749 device_xname(dev)); 1750 #endif /* DIAGNOSTIC */ 1751 return ENOENT; 1752 } 1753 alldevs.nwrite++; 1754 mutex_exit(&alldevs.lock); 1755 1756 if (!detachall && 1757 (flags & (DETACH_SHUTDOWN|DETACH_FORCE)) == DETACH_SHUTDOWN && 1758 (dev->dv_flags & DVF_DETACH_SHUTDOWN) == 0) { 1759 rv = EOPNOTSUPP; 1760 } else if (ca->ca_detach != NULL) { 1761 rv = (*ca->ca_detach)(dev, flags); 1762 } else 1763 rv = EOPNOTSUPP; 1764 1765 /* 1766 * If it was not possible to detach the device, then we either 1767 * panic() (for the forced but failed case), or return an error. 1768 * 1769 * If it was possible to detach the device, ensure that the 1770 * device is deactivated. 1771 */ 1772 if (rv == 0) 1773 dev->dv_flags &= ~DVF_ACTIVE; 1774 else if ((flags & DETACH_FORCE) == 0) 1775 goto out; 1776 else { 1777 panic("config_detach: forced detach of %s failed (%d)", 1778 device_xname(dev), rv); 1779 } 1780 1781 /* 1782 * The device has now been successfully detached. 1783 */ 1784 1785 /* Let userland know */ 1786 devmon_report_device(dev, false); 1787 1788 #ifdef DIAGNOSTIC 1789 /* 1790 * Sanity: If you're successfully detached, you should have no 1791 * children. (Note that because children must be attached 1792 * after parents, we only need to search the latter part of 1793 * the list.) 1794 */ 1795 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1796 d = TAILQ_NEXT(d, dv_list)) { 1797 if (d->dv_parent == dev && d->dv_del_gen == 0) { 1798 printf("config_detach: detached device %s" 1799 " has children %s\n", device_xname(dev), 1800 device_xname(d)); 1801 panic("config_detach"); 1802 } 1803 } 1804 #endif 1805 1806 /* notify the parent that the child is gone */ 1807 if (dev->dv_parent) { 1808 device_t p = dev->dv_parent; 1809 if (p->dv_cfattach->ca_childdetached) 1810 (*p->dv_cfattach->ca_childdetached)(p, dev); 1811 } 1812 1813 /* 1814 * Mark cfdata to show that the unit can be reused, if possible. 1815 */ 1816 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1817 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1818 if (STREQ(cf->cf_name, cd->cd_name)) { 1819 if (cf->cf_fstate == FSTATE_FOUND && 1820 cf->cf_unit == dev->dv_unit) 1821 cf->cf_fstate = FSTATE_NOTFOUND; 1822 } 1823 } 1824 } 1825 1826 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1827 aprint_normal_dev(dev, "detached\n"); 1828 1829 out: 1830 config_alldevs_enter(&af); 1831 KASSERT(alldevs.nwrite != 0); 1832 --alldevs.nwrite; 1833 if (rv == 0 && dev->dv_del_gen == 0) { 1834 if (alldevs.nwrite == 0 && alldevs.nread == 0) 1835 config_devunlink(dev, &af.af_garbage); 1836 else { 1837 dev->dv_del_gen = alldevs.gen; 1838 alldevs.garbage = true; 1839 } 1840 } 1841 config_alldevs_exit(&af); 1842 1843 return rv; 1844 } 1845 1846 int 1847 config_detach_children(device_t parent, int flags) 1848 { 1849 device_t dv; 1850 deviter_t di; 1851 int error = 0; 1852 1853 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1854 dv = deviter_next(&di)) { 1855 if (device_parent(dv) != parent) 1856 continue; 1857 if ((error = config_detach(dv, flags)) != 0) 1858 break; 1859 } 1860 deviter_release(&di); 1861 return error; 1862 } 1863 1864 device_t 1865 shutdown_first(struct shutdown_state *s) 1866 { 1867 if (!s->initialized) { 1868 deviter_init(&s->di, DEVITER_F_SHUTDOWN|DEVITER_F_LEAVES_FIRST); 1869 s->initialized = true; 1870 } 1871 return shutdown_next(s); 1872 } 1873 1874 device_t 1875 shutdown_next(struct shutdown_state *s) 1876 { 1877 device_t dv; 1878 1879 while ((dv = deviter_next(&s->di)) != NULL && !device_is_active(dv)) 1880 ; 1881 1882 if (dv == NULL) 1883 s->initialized = false; 1884 1885 return dv; 1886 } 1887 1888 bool 1889 config_detach_all(int how) 1890 { 1891 static struct shutdown_state s; 1892 device_t curdev; 1893 bool progress = false; 1894 int flags; 1895 1896 if ((how & (RB_NOSYNC|RB_DUMP)) != 0) 1897 return false; 1898 1899 if ((how & RB_POWERDOWN) == RB_POWERDOWN) 1900 flags = DETACH_SHUTDOWN | DETACH_POWEROFF; 1901 else 1902 flags = DETACH_SHUTDOWN; 1903 1904 for (curdev = shutdown_first(&s); curdev != NULL; 1905 curdev = shutdown_next(&s)) { 1906 aprint_debug(" detaching %s, ", device_xname(curdev)); 1907 if (config_detach(curdev, flags) == 0) { 1908 progress = true; 1909 aprint_debug("success."); 1910 } else 1911 aprint_debug("failed."); 1912 } 1913 return progress; 1914 } 1915 1916 static bool 1917 device_is_ancestor_of(device_t ancestor, device_t descendant) 1918 { 1919 device_t dv; 1920 1921 for (dv = descendant; dv != NULL; dv = device_parent(dv)) { 1922 if (device_parent(dv) == ancestor) 1923 return true; 1924 } 1925 return false; 1926 } 1927 1928 int 1929 config_deactivate(device_t dev) 1930 { 1931 deviter_t di; 1932 const struct cfattach *ca; 1933 device_t descendant; 1934 int s, rv = 0, oflags; 1935 1936 for (descendant = deviter_first(&di, DEVITER_F_ROOT_FIRST); 1937 descendant != NULL; 1938 descendant = deviter_next(&di)) { 1939 if (dev != descendant && 1940 !device_is_ancestor_of(dev, descendant)) 1941 continue; 1942 1943 if ((descendant->dv_flags & DVF_ACTIVE) == 0) 1944 continue; 1945 1946 ca = descendant->dv_cfattach; 1947 oflags = descendant->dv_flags; 1948 1949 descendant->dv_flags &= ~DVF_ACTIVE; 1950 if (ca->ca_activate == NULL) 1951 continue; 1952 s = splhigh(); 1953 rv = (*ca->ca_activate)(descendant, DVACT_DEACTIVATE); 1954 splx(s); 1955 if (rv != 0) 1956 descendant->dv_flags = oflags; 1957 } 1958 deviter_release(&di); 1959 return rv; 1960 } 1961 1962 /* 1963 * Defer the configuration of the specified device until all 1964 * of its parent's devices have been attached. 1965 */ 1966 void 1967 config_defer(device_t dev, void (*func)(device_t)) 1968 { 1969 struct deferred_config *dc; 1970 1971 if (dev->dv_parent == NULL) 1972 panic("config_defer: can't defer config of a root device"); 1973 1974 #ifdef DIAGNOSTIC 1975 TAILQ_FOREACH(dc, &deferred_config_queue, dc_queue) { 1976 if (dc->dc_dev == dev) 1977 panic("config_defer: deferred twice"); 1978 } 1979 #endif 1980 1981 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1982 if (dc == NULL) 1983 panic("config_defer: unable to allocate callback"); 1984 1985 dc->dc_dev = dev; 1986 dc->dc_func = func; 1987 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1988 config_pending_incr(dev); 1989 } 1990 1991 /* 1992 * Defer some autoconfiguration for a device until after interrupts 1993 * are enabled. 1994 */ 1995 void 1996 config_interrupts(device_t dev, void (*func)(device_t)) 1997 { 1998 struct deferred_config *dc; 1999 2000 /* 2001 * If interrupts are enabled, callback now. 2002 */ 2003 if (cold == 0) { 2004 (*func)(dev); 2005 return; 2006 } 2007 2008 #ifdef DIAGNOSTIC 2009 TAILQ_FOREACH(dc, &interrupt_config_queue, dc_queue) { 2010 if (dc->dc_dev == dev) 2011 panic("config_interrupts: deferred twice"); 2012 } 2013 #endif 2014 2015 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2016 if (dc == NULL) 2017 panic("config_interrupts: unable to allocate callback"); 2018 2019 dc->dc_dev = dev; 2020 dc->dc_func = func; 2021 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 2022 config_pending_incr(dev); 2023 } 2024 2025 /* 2026 * Defer some autoconfiguration for a device until after root file system 2027 * is mounted (to load firmware etc). 2028 */ 2029 void 2030 config_mountroot(device_t dev, void (*func)(device_t)) 2031 { 2032 struct deferred_config *dc; 2033 2034 /* 2035 * If root file system is mounted, callback now. 2036 */ 2037 if (root_is_mounted) { 2038 (*func)(dev); 2039 return; 2040 } 2041 2042 #ifdef DIAGNOSTIC 2043 TAILQ_FOREACH(dc, &mountroot_config_queue, dc_queue) { 2044 if (dc->dc_dev == dev) 2045 panic("%s: deferred twice", __func__); 2046 } 2047 #endif 2048 2049 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2050 if (dc == NULL) 2051 panic("%s: unable to allocate callback", __func__); 2052 2053 dc->dc_dev = dev; 2054 dc->dc_func = func; 2055 TAILQ_INSERT_TAIL(&mountroot_config_queue, dc, dc_queue); 2056 } 2057 2058 /* 2059 * Process a deferred configuration queue. 2060 */ 2061 static void 2062 config_process_deferred(struct deferred_config_head *queue, device_t parent) 2063 { 2064 struct deferred_config *dc, *ndc; 2065 2066 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 2067 ndc = TAILQ_NEXT(dc, dc_queue); 2068 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 2069 TAILQ_REMOVE(queue, dc, dc_queue); 2070 (*dc->dc_func)(dc->dc_dev); 2071 config_pending_decr(dc->dc_dev); 2072 kmem_free(dc, sizeof(*dc)); 2073 } 2074 } 2075 } 2076 2077 /* 2078 * Manipulate the config_pending semaphore. 2079 */ 2080 void 2081 config_pending_incr(device_t dev) 2082 { 2083 2084 mutex_enter(&config_misc_lock); 2085 config_pending++; 2086 #ifdef DEBUG_AUTOCONF 2087 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2088 #endif 2089 mutex_exit(&config_misc_lock); 2090 } 2091 2092 void 2093 config_pending_decr(device_t dev) 2094 { 2095 2096 #ifdef DIAGNOSTIC 2097 if (config_pending == 0) 2098 panic("config_pending_decr: config_pending == 0"); 2099 #endif 2100 mutex_enter(&config_misc_lock); 2101 config_pending--; 2102 #ifdef DEBUG_AUTOCONF 2103 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2104 #endif 2105 if (config_pending == 0) 2106 cv_broadcast(&config_misc_cv); 2107 mutex_exit(&config_misc_lock); 2108 } 2109 2110 /* 2111 * Register a "finalization" routine. Finalization routines are 2112 * called iteratively once all real devices have been found during 2113 * autoconfiguration, for as long as any one finalizer has done 2114 * any work. 2115 */ 2116 int 2117 config_finalize_register(device_t dev, int (*fn)(device_t)) 2118 { 2119 struct finalize_hook *f; 2120 2121 /* 2122 * If finalization has already been done, invoke the 2123 * callback function now. 2124 */ 2125 if (config_finalize_done) { 2126 while ((*fn)(dev) != 0) 2127 /* loop */ ; 2128 return 0; 2129 } 2130 2131 /* Ensure this isn't already on the list. */ 2132 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 2133 if (f->f_func == fn && f->f_dev == dev) 2134 return EEXIST; 2135 } 2136 2137 f = kmem_alloc(sizeof(*f), KM_SLEEP); 2138 f->f_func = fn; 2139 f->f_dev = dev; 2140 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 2141 2142 return 0; 2143 } 2144 2145 void 2146 config_finalize(void) 2147 { 2148 struct finalize_hook *f; 2149 struct pdevinit *pdev; 2150 extern struct pdevinit pdevinit[]; 2151 int errcnt, rv; 2152 2153 /* 2154 * Now that device driver threads have been created, wait for 2155 * them to finish any deferred autoconfiguration. 2156 */ 2157 mutex_enter(&config_misc_lock); 2158 while (config_pending != 0) 2159 cv_wait(&config_misc_cv, &config_misc_lock); 2160 mutex_exit(&config_misc_lock); 2161 2162 KERNEL_LOCK(1, NULL); 2163 2164 /* Attach pseudo-devices. */ 2165 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 2166 (*pdev->pdev_attach)(pdev->pdev_count); 2167 2168 /* Run the hooks until none of them does any work. */ 2169 do { 2170 rv = 0; 2171 TAILQ_FOREACH(f, &config_finalize_list, f_list) 2172 rv |= (*f->f_func)(f->f_dev); 2173 } while (rv != 0); 2174 2175 config_finalize_done = 1; 2176 2177 /* Now free all the hooks. */ 2178 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 2179 TAILQ_REMOVE(&config_finalize_list, f, f_list); 2180 kmem_free(f, sizeof(*f)); 2181 } 2182 2183 KERNEL_UNLOCK_ONE(NULL); 2184 2185 errcnt = aprint_get_error_count(); 2186 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 2187 (boothowto & AB_VERBOSE) == 0) { 2188 mutex_enter(&config_misc_lock); 2189 if (config_do_twiddle) { 2190 config_do_twiddle = 0; 2191 printf_nolog(" done.\n"); 2192 } 2193 mutex_exit(&config_misc_lock); 2194 } 2195 if (errcnt != 0) { 2196 printf("WARNING: %d error%s while detecting hardware; " 2197 "check system log.\n", errcnt, 2198 errcnt == 1 ? "" : "s"); 2199 } 2200 } 2201 2202 void 2203 config_twiddle_init(void) 2204 { 2205 2206 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 2207 config_do_twiddle = 1; 2208 } 2209 callout_setfunc(&config_twiddle_ch, config_twiddle_fn, NULL); 2210 } 2211 2212 void 2213 config_twiddle_fn(void *cookie) 2214 { 2215 2216 mutex_enter(&config_misc_lock); 2217 if (config_do_twiddle) { 2218 twiddle(); 2219 callout_schedule(&config_twiddle_ch, mstohz(100)); 2220 } 2221 mutex_exit(&config_misc_lock); 2222 } 2223 2224 static void 2225 config_alldevs_enter(struct alldevs_foray *af) 2226 { 2227 TAILQ_INIT(&af->af_garbage); 2228 mutex_enter(&alldevs.lock); 2229 config_collect_garbage(&af->af_garbage); 2230 } 2231 2232 static void 2233 config_alldevs_exit(struct alldevs_foray *af) 2234 { 2235 mutex_exit(&alldevs.lock); 2236 config_dump_garbage(&af->af_garbage); 2237 } 2238 2239 /* 2240 * device_lookup: 2241 * 2242 * Look up a device instance for a given driver. 2243 */ 2244 device_t 2245 device_lookup(cfdriver_t cd, int unit) 2246 { 2247 device_t dv; 2248 2249 mutex_enter(&alldevs.lock); 2250 if (unit < 0 || unit >= cd->cd_ndevs) 2251 dv = NULL; 2252 else if ((dv = cd->cd_devs[unit]) != NULL && dv->dv_del_gen != 0) 2253 dv = NULL; 2254 mutex_exit(&alldevs.lock); 2255 2256 return dv; 2257 } 2258 2259 /* 2260 * device_lookup_private: 2261 * 2262 * Look up a softc instance for a given driver. 2263 */ 2264 void * 2265 device_lookup_private(cfdriver_t cd, int unit) 2266 { 2267 2268 return device_private(device_lookup(cd, unit)); 2269 } 2270 2271 /* 2272 * device_find_by_xname: 2273 * 2274 * Returns the device of the given name or NULL if it doesn't exist. 2275 */ 2276 device_t 2277 device_find_by_xname(const char *name) 2278 { 2279 device_t dv; 2280 deviter_t di; 2281 2282 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 2283 if (strcmp(device_xname(dv), name) == 0) 2284 break; 2285 } 2286 deviter_release(&di); 2287 2288 return dv; 2289 } 2290 2291 /* 2292 * device_find_by_driver_unit: 2293 * 2294 * Returns the device of the given driver name and unit or 2295 * NULL if it doesn't exist. 2296 */ 2297 device_t 2298 device_find_by_driver_unit(const char *name, int unit) 2299 { 2300 struct cfdriver *cd; 2301 2302 if ((cd = config_cfdriver_lookup(name)) == NULL) 2303 return NULL; 2304 return device_lookup(cd, unit); 2305 } 2306 2307 /* 2308 * Power management related functions. 2309 */ 2310 2311 bool 2312 device_pmf_is_registered(device_t dev) 2313 { 2314 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 2315 } 2316 2317 bool 2318 device_pmf_driver_suspend(device_t dev, const pmf_qual_t *qual) 2319 { 2320 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2321 return true; 2322 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2323 return false; 2324 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2325 dev->dv_driver_suspend != NULL && 2326 !(*dev->dv_driver_suspend)(dev, qual)) 2327 return false; 2328 2329 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 2330 return true; 2331 } 2332 2333 bool 2334 device_pmf_driver_resume(device_t dev, const pmf_qual_t *qual) 2335 { 2336 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2337 return true; 2338 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2339 return false; 2340 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2341 dev->dv_driver_resume != NULL && 2342 !(*dev->dv_driver_resume)(dev, qual)) 2343 return false; 2344 2345 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2346 return true; 2347 } 2348 2349 bool 2350 device_pmf_driver_shutdown(device_t dev, int how) 2351 { 2352 2353 if (*dev->dv_driver_shutdown != NULL && 2354 !(*dev->dv_driver_shutdown)(dev, how)) 2355 return false; 2356 return true; 2357 } 2358 2359 bool 2360 device_pmf_driver_register(device_t dev, 2361 bool (*suspend)(device_t, const pmf_qual_t *), 2362 bool (*resume)(device_t, const pmf_qual_t *), 2363 bool (*shutdown)(device_t, int)) 2364 { 2365 dev->dv_driver_suspend = suspend; 2366 dev->dv_driver_resume = resume; 2367 dev->dv_driver_shutdown = shutdown; 2368 dev->dv_flags |= DVF_POWER_HANDLERS; 2369 return true; 2370 } 2371 2372 static const char * 2373 curlwp_name(void) 2374 { 2375 if (curlwp->l_name != NULL) 2376 return curlwp->l_name; 2377 else 2378 return curlwp->l_proc->p_comm; 2379 } 2380 2381 void 2382 device_pmf_driver_deregister(device_t dev) 2383 { 2384 device_lock_t dvl = device_getlock(dev); 2385 2386 dev->dv_driver_suspend = NULL; 2387 dev->dv_driver_resume = NULL; 2388 2389 mutex_enter(&dvl->dvl_mtx); 2390 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2391 while (dvl->dvl_nlock > 0 || dvl->dvl_nwait > 0) { 2392 /* Wake a thread that waits for the lock. That 2393 * thread will fail to acquire the lock, and then 2394 * it will wake the next thread that waits for the 2395 * lock, or else it will wake us. 2396 */ 2397 cv_signal(&dvl->dvl_cv); 2398 pmflock_debug(dev, __func__, __LINE__); 2399 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2400 pmflock_debug(dev, __func__, __LINE__); 2401 } 2402 mutex_exit(&dvl->dvl_mtx); 2403 } 2404 2405 bool 2406 device_pmf_driver_child_register(device_t dev) 2407 { 2408 device_t parent = device_parent(dev); 2409 2410 if (parent == NULL || parent->dv_driver_child_register == NULL) 2411 return true; 2412 return (*parent->dv_driver_child_register)(dev); 2413 } 2414 2415 void 2416 device_pmf_driver_set_child_register(device_t dev, 2417 bool (*child_register)(device_t)) 2418 { 2419 dev->dv_driver_child_register = child_register; 2420 } 2421 2422 static void 2423 pmflock_debug(device_t dev, const char *func, int line) 2424 { 2425 device_lock_t dvl = device_getlock(dev); 2426 2427 aprint_debug_dev(dev, 2428 "%s.%d, %s dvl_nlock %d dvl_nwait %d dv_flags %x\n", func, line, 2429 curlwp_name(), dvl->dvl_nlock, dvl->dvl_nwait, dev->dv_flags); 2430 } 2431 2432 static bool 2433 device_pmf_lock1(device_t dev) 2434 { 2435 device_lock_t dvl = device_getlock(dev); 2436 2437 while (device_pmf_is_registered(dev) && 2438 dvl->dvl_nlock > 0 && dvl->dvl_holder != curlwp) { 2439 dvl->dvl_nwait++; 2440 pmflock_debug(dev, __func__, __LINE__); 2441 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2442 pmflock_debug(dev, __func__, __LINE__); 2443 dvl->dvl_nwait--; 2444 } 2445 if (!device_pmf_is_registered(dev)) { 2446 pmflock_debug(dev, __func__, __LINE__); 2447 /* We could not acquire the lock, but some other thread may 2448 * wait for it, also. Wake that thread. 2449 */ 2450 cv_signal(&dvl->dvl_cv); 2451 return false; 2452 } 2453 dvl->dvl_nlock++; 2454 dvl->dvl_holder = curlwp; 2455 pmflock_debug(dev, __func__, __LINE__); 2456 return true; 2457 } 2458 2459 bool 2460 device_pmf_lock(device_t dev) 2461 { 2462 bool rc; 2463 device_lock_t dvl = device_getlock(dev); 2464 2465 mutex_enter(&dvl->dvl_mtx); 2466 rc = device_pmf_lock1(dev); 2467 mutex_exit(&dvl->dvl_mtx); 2468 2469 return rc; 2470 } 2471 2472 void 2473 device_pmf_unlock(device_t dev) 2474 { 2475 device_lock_t dvl = device_getlock(dev); 2476 2477 KASSERT(dvl->dvl_nlock > 0); 2478 mutex_enter(&dvl->dvl_mtx); 2479 if (--dvl->dvl_nlock == 0) 2480 dvl->dvl_holder = NULL; 2481 cv_signal(&dvl->dvl_cv); 2482 pmflock_debug(dev, __func__, __LINE__); 2483 mutex_exit(&dvl->dvl_mtx); 2484 } 2485 2486 device_lock_t 2487 device_getlock(device_t dev) 2488 { 2489 return &dev->dv_lock; 2490 } 2491 2492 void * 2493 device_pmf_bus_private(device_t dev) 2494 { 2495 return dev->dv_bus_private; 2496 } 2497 2498 bool 2499 device_pmf_bus_suspend(device_t dev, const pmf_qual_t *qual) 2500 { 2501 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2502 return true; 2503 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2504 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2505 return false; 2506 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2507 dev->dv_bus_suspend != NULL && 2508 !(*dev->dv_bus_suspend)(dev, qual)) 2509 return false; 2510 2511 dev->dv_flags |= DVF_BUS_SUSPENDED; 2512 return true; 2513 } 2514 2515 bool 2516 device_pmf_bus_resume(device_t dev, const pmf_qual_t *qual) 2517 { 2518 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2519 return true; 2520 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2521 dev->dv_bus_resume != NULL && 2522 !(*dev->dv_bus_resume)(dev, qual)) 2523 return false; 2524 2525 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2526 return true; 2527 } 2528 2529 bool 2530 device_pmf_bus_shutdown(device_t dev, int how) 2531 { 2532 2533 if (*dev->dv_bus_shutdown != NULL && 2534 !(*dev->dv_bus_shutdown)(dev, how)) 2535 return false; 2536 return true; 2537 } 2538 2539 void 2540 device_pmf_bus_register(device_t dev, void *priv, 2541 bool (*suspend)(device_t, const pmf_qual_t *), 2542 bool (*resume)(device_t, const pmf_qual_t *), 2543 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2544 { 2545 dev->dv_bus_private = priv; 2546 dev->dv_bus_resume = resume; 2547 dev->dv_bus_suspend = suspend; 2548 dev->dv_bus_shutdown = shutdown; 2549 dev->dv_bus_deregister = deregister; 2550 } 2551 2552 void 2553 device_pmf_bus_deregister(device_t dev) 2554 { 2555 if (dev->dv_bus_deregister == NULL) 2556 return; 2557 (*dev->dv_bus_deregister)(dev); 2558 dev->dv_bus_private = NULL; 2559 dev->dv_bus_suspend = NULL; 2560 dev->dv_bus_resume = NULL; 2561 dev->dv_bus_deregister = NULL; 2562 } 2563 2564 void * 2565 device_pmf_class_private(device_t dev) 2566 { 2567 return dev->dv_class_private; 2568 } 2569 2570 bool 2571 device_pmf_class_suspend(device_t dev, const pmf_qual_t *qual) 2572 { 2573 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2574 return true; 2575 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2576 dev->dv_class_suspend != NULL && 2577 !(*dev->dv_class_suspend)(dev, qual)) 2578 return false; 2579 2580 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2581 return true; 2582 } 2583 2584 bool 2585 device_pmf_class_resume(device_t dev, const pmf_qual_t *qual) 2586 { 2587 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2588 return true; 2589 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2590 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2591 return false; 2592 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2593 dev->dv_class_resume != NULL && 2594 !(*dev->dv_class_resume)(dev, qual)) 2595 return false; 2596 2597 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2598 return true; 2599 } 2600 2601 void 2602 device_pmf_class_register(device_t dev, void *priv, 2603 bool (*suspend)(device_t, const pmf_qual_t *), 2604 bool (*resume)(device_t, const pmf_qual_t *), 2605 void (*deregister)(device_t)) 2606 { 2607 dev->dv_class_private = priv; 2608 dev->dv_class_suspend = suspend; 2609 dev->dv_class_resume = resume; 2610 dev->dv_class_deregister = deregister; 2611 } 2612 2613 void 2614 device_pmf_class_deregister(device_t dev) 2615 { 2616 if (dev->dv_class_deregister == NULL) 2617 return; 2618 (*dev->dv_class_deregister)(dev); 2619 dev->dv_class_private = NULL; 2620 dev->dv_class_suspend = NULL; 2621 dev->dv_class_resume = NULL; 2622 dev->dv_class_deregister = NULL; 2623 } 2624 2625 bool 2626 device_active(device_t dev, devactive_t type) 2627 { 2628 size_t i; 2629 2630 if (dev->dv_activity_count == 0) 2631 return false; 2632 2633 for (i = 0; i < dev->dv_activity_count; ++i) { 2634 if (dev->dv_activity_handlers[i] == NULL) 2635 break; 2636 (*dev->dv_activity_handlers[i])(dev, type); 2637 } 2638 2639 return true; 2640 } 2641 2642 bool 2643 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2644 { 2645 void (**new_handlers)(device_t, devactive_t); 2646 void (**old_handlers)(device_t, devactive_t); 2647 size_t i, old_size, new_size; 2648 int s; 2649 2650 old_handlers = dev->dv_activity_handlers; 2651 old_size = dev->dv_activity_count; 2652 2653 KASSERT(old_size == 0 || old_handlers != NULL); 2654 2655 for (i = 0; i < old_size; ++i) { 2656 KASSERT(old_handlers[i] != handler); 2657 if (old_handlers[i] == NULL) { 2658 old_handlers[i] = handler; 2659 return true; 2660 } 2661 } 2662 2663 new_size = old_size + 4; 2664 new_handlers = kmem_alloc(sizeof(void *[new_size]), KM_SLEEP); 2665 2666 for (i = 0; i < old_size; ++i) 2667 new_handlers[i] = old_handlers[i]; 2668 new_handlers[old_size] = handler; 2669 for (i = old_size+1; i < new_size; ++i) 2670 new_handlers[i] = NULL; 2671 2672 s = splhigh(); 2673 dev->dv_activity_count = new_size; 2674 dev->dv_activity_handlers = new_handlers; 2675 splx(s); 2676 2677 if (old_size > 0) 2678 kmem_free(old_handlers, sizeof(void * [old_size])); 2679 2680 return true; 2681 } 2682 2683 void 2684 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2685 { 2686 void (**old_handlers)(device_t, devactive_t); 2687 size_t i, old_size; 2688 int s; 2689 2690 old_handlers = dev->dv_activity_handlers; 2691 old_size = dev->dv_activity_count; 2692 2693 for (i = 0; i < old_size; ++i) { 2694 if (old_handlers[i] == handler) 2695 break; 2696 if (old_handlers[i] == NULL) 2697 return; /* XXX panic? */ 2698 } 2699 2700 if (i == old_size) 2701 return; /* XXX panic? */ 2702 2703 for (; i < old_size - 1; ++i) { 2704 if ((old_handlers[i] = old_handlers[i + 1]) != NULL) 2705 continue; 2706 2707 if (i == 0) { 2708 s = splhigh(); 2709 dev->dv_activity_count = 0; 2710 dev->dv_activity_handlers = NULL; 2711 splx(s); 2712 kmem_free(old_handlers, sizeof(void *[old_size])); 2713 } 2714 return; 2715 } 2716 old_handlers[i] = NULL; 2717 } 2718 2719 /* Return true iff the device_t `dev' exists at generation `gen'. */ 2720 static bool 2721 device_exists_at(device_t dv, devgen_t gen) 2722 { 2723 return (dv->dv_del_gen == 0 || dv->dv_del_gen > gen) && 2724 dv->dv_add_gen <= gen; 2725 } 2726 2727 static bool 2728 deviter_visits(const deviter_t *di, device_t dv) 2729 { 2730 return device_exists_at(dv, di->di_gen); 2731 } 2732 2733 /* 2734 * Device Iteration 2735 * 2736 * deviter_t: a device iterator. Holds state for a "walk" visiting 2737 * each device_t's in the device tree. 2738 * 2739 * deviter_init(di, flags): initialize the device iterator `di' 2740 * to "walk" the device tree. deviter_next(di) will return 2741 * the first device_t in the device tree, or NULL if there are 2742 * no devices. 2743 * 2744 * `flags' is one or more of DEVITER_F_RW, indicating that the 2745 * caller intends to modify the device tree by calling 2746 * config_detach(9) on devices in the order that the iterator 2747 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2748 * nearest the "root" of the device tree to be returned, first; 2749 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2750 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2751 * indicating both that deviter_init() should not respect any 2752 * locks on the device tree, and that deviter_next(di) may run 2753 * in more than one LWP before the walk has finished. 2754 * 2755 * Only one DEVITER_F_RW iterator may be in the device tree at 2756 * once. 2757 * 2758 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2759 * 2760 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2761 * DEVITER_F_LEAVES_FIRST are used in combination. 2762 * 2763 * deviter_first(di, flags): initialize the device iterator `di' 2764 * and return the first device_t in the device tree, or NULL 2765 * if there are no devices. The statement 2766 * 2767 * dv = deviter_first(di); 2768 * 2769 * is shorthand for 2770 * 2771 * deviter_init(di); 2772 * dv = deviter_next(di); 2773 * 2774 * deviter_next(di): return the next device_t in the device tree, 2775 * or NULL if there are no more devices. deviter_next(di) 2776 * is undefined if `di' was not initialized with deviter_init() or 2777 * deviter_first(). 2778 * 2779 * deviter_release(di): stops iteration (subsequent calls to 2780 * deviter_next() will return NULL), releases any locks and 2781 * resources held by the device iterator. 2782 * 2783 * Device iteration does not return device_t's in any particular 2784 * order. An iterator will never return the same device_t twice. 2785 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2786 * is called repeatedly on the same `di', it will eventually return 2787 * NULL. It is ok to attach/detach devices during device iteration. 2788 */ 2789 void 2790 deviter_init(deviter_t *di, deviter_flags_t flags) 2791 { 2792 device_t dv; 2793 2794 memset(di, 0, sizeof(*di)); 2795 2796 if ((flags & DEVITER_F_SHUTDOWN) != 0) 2797 flags |= DEVITER_F_RW; 2798 2799 mutex_enter(&alldevs.lock); 2800 if ((flags & DEVITER_F_RW) != 0) 2801 alldevs.nwrite++; 2802 else 2803 alldevs.nread++; 2804 di->di_gen = alldevs.gen++; 2805 di->di_flags = flags; 2806 2807 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2808 case DEVITER_F_LEAVES_FIRST: 2809 TAILQ_FOREACH(dv, &alldevs.list, dv_list) { 2810 if (!deviter_visits(di, dv)) 2811 continue; 2812 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2813 } 2814 break; 2815 case DEVITER_F_ROOT_FIRST: 2816 TAILQ_FOREACH(dv, &alldevs.list, dv_list) { 2817 if (!deviter_visits(di, dv)) 2818 continue; 2819 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2820 } 2821 break; 2822 default: 2823 break; 2824 } 2825 2826 deviter_reinit(di); 2827 mutex_exit(&alldevs.lock); 2828 } 2829 2830 static void 2831 deviter_reinit(deviter_t *di) 2832 { 2833 2834 KASSERT(mutex_owned(&alldevs.lock)); 2835 if ((di->di_flags & DEVITER_F_RW) != 0) 2836 di->di_prev = TAILQ_LAST(&alldevs.list, devicelist); 2837 else 2838 di->di_prev = TAILQ_FIRST(&alldevs.list); 2839 } 2840 2841 device_t 2842 deviter_first(deviter_t *di, deviter_flags_t flags) 2843 { 2844 2845 deviter_init(di, flags); 2846 return deviter_next(di); 2847 } 2848 2849 static device_t 2850 deviter_next2(deviter_t *di) 2851 { 2852 device_t dv; 2853 2854 KASSERT(mutex_owned(&alldevs.lock)); 2855 2856 dv = di->di_prev; 2857 2858 if (dv == NULL) 2859 return NULL; 2860 2861 if ((di->di_flags & DEVITER_F_RW) != 0) 2862 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2863 else 2864 di->di_prev = TAILQ_NEXT(dv, dv_list); 2865 2866 return dv; 2867 } 2868 2869 static device_t 2870 deviter_next1(deviter_t *di) 2871 { 2872 device_t dv; 2873 2874 KASSERT(mutex_owned(&alldevs.lock)); 2875 2876 do { 2877 dv = deviter_next2(di); 2878 } while (dv != NULL && !deviter_visits(di, dv)); 2879 2880 return dv; 2881 } 2882 2883 device_t 2884 deviter_next(deviter_t *di) 2885 { 2886 device_t dv = NULL; 2887 2888 mutex_enter(&alldevs.lock); 2889 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2890 case 0: 2891 dv = deviter_next1(di); 2892 break; 2893 case DEVITER_F_LEAVES_FIRST: 2894 while (di->di_curdepth >= 0) { 2895 if ((dv = deviter_next1(di)) == NULL) { 2896 di->di_curdepth--; 2897 deviter_reinit(di); 2898 } else if (dv->dv_depth == di->di_curdepth) 2899 break; 2900 } 2901 break; 2902 case DEVITER_F_ROOT_FIRST: 2903 while (di->di_curdepth <= di->di_maxdepth) { 2904 if ((dv = deviter_next1(di)) == NULL) { 2905 di->di_curdepth++; 2906 deviter_reinit(di); 2907 } else if (dv->dv_depth == di->di_curdepth) 2908 break; 2909 } 2910 break; 2911 default: 2912 break; 2913 } 2914 mutex_exit(&alldevs.lock); 2915 2916 return dv; 2917 } 2918 2919 void 2920 deviter_release(deviter_t *di) 2921 { 2922 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 2923 2924 mutex_enter(&alldevs.lock); 2925 if (rw) 2926 --alldevs.nwrite; 2927 else 2928 --alldevs.nread; 2929 /* XXX wake a garbage-collection thread */ 2930 mutex_exit(&alldevs.lock); 2931 } 2932 2933 const char * 2934 cfdata_ifattr(const struct cfdata *cf) 2935 { 2936 return cf->cf_pspec->cfp_iattr; 2937 } 2938 2939 bool 2940 ifattr_match(const char *snull, const char *t) 2941 { 2942 return (snull == NULL) || strcmp(snull, t) == 0; 2943 } 2944 2945 void 2946 null_childdetached(device_t self, device_t child) 2947 { 2948 /* do nothing */ 2949 } 2950 2951 static void 2952 sysctl_detach_setup(struct sysctllog **clog) 2953 { 2954 2955 sysctl_createv(clog, 0, NULL, NULL, 2956 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 2957 CTLTYPE_BOOL, "detachall", 2958 SYSCTL_DESCR("Detach all devices at shutdown"), 2959 NULL, 0, &detachall, 0, 2960 CTL_KERN, CTL_CREATE, CTL_EOL); 2961 } 2962
Indexes created Fri Sep 26 20:09:58 GMT 2025