subr_autoconf.c revision 1.236
1 /* $NetBSD: subr_autoconf.c,v 1.236 2015/11/08 21:03:00 joerg 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 1.236 2015/11/08 21:03:00 joerg Exp $"); 81 82 #ifdef _KERNEL_OPT 83 #include "opt_ddb.h" 84 #include "drvctl.h" 85 #endif 86 87 #include <sys/param.h> 88 #include <sys/device.h> 89 #include <sys/disklabel.h> 90 #include <sys/conf.h> 91 #include <sys/kauth.h> 92 #include <sys/kmem.h> 93 #include <sys/systm.h> 94 #include <sys/kernel.h> 95 #include <sys/errno.h> 96 #include <sys/proc.h> 97 #include <sys/reboot.h> 98 #include <sys/kthread.h> 99 #include <sys/buf.h> 100 #include <sys/dirent.h> 101 #include <sys/mount.h> 102 #include <sys/namei.h> 103 #include <sys/unistd.h> 104 #include <sys/fcntl.h> 105 #include <sys/lockf.h> 106 #include <sys/callout.h> 107 #include <sys/devmon.h> 108 #include <sys/cpu.h> 109 #include <sys/sysctl.h> 110 111 #include <sys/disk.h> 112 113 #include <sys/rndsource.h> 114 115 #include <machine/limits.h> 116 117 /* 118 * Autoconfiguration subroutines. 119 */ 120 121 /* 122 * Device autoconfiguration timings are mixed into the entropy pool. 123 */ 124 extern krndsource_t rnd_autoconf_source; 125 126 /* 127 * ioconf.c exports exactly two names: cfdata and cfroots. All system 128 * devices and drivers are found via these tables. 129 */ 130 extern struct cfdata cfdata[]; 131 extern const short cfroots[]; 132 133 /* 134 * List of all cfdriver structures. We use this to detect duplicates 135 * when other cfdrivers are loaded. 136 */ 137 struct cfdriverlist allcfdrivers = LIST_HEAD_INITIALIZER(&allcfdrivers); 138 extern struct cfdriver * const cfdriver_list_initial[]; 139 140 /* 141 * Initial list of cfattach's. 142 */ 143 extern const struct cfattachinit cfattachinit[]; 144 145 /* 146 * List of cfdata tables. We always have one such list -- the one 147 * built statically when the kernel was configured. 148 */ 149 struct cftablelist allcftables = TAILQ_HEAD_INITIALIZER(allcftables); 150 static struct cftable initcftable; 151 152 #define ROOT ((device_t)NULL) 153 154 struct matchinfo { 155 cfsubmatch_t fn; 156 device_t parent; 157 const int *locs; 158 void *aux; 159 struct cfdata *match; 160 int pri; 161 }; 162 163 struct alldevs_foray { 164 int af_s; 165 struct devicelist af_garbage; 166 }; 167 168 static char *number(char *, int); 169 static void mapply(struct matchinfo *, cfdata_t); 170 static device_t config_devalloc(const device_t, const cfdata_t, const int *); 171 static void config_devdelete(device_t); 172 static void config_devunlink(device_t, struct devicelist *); 173 static void config_makeroom(int, struct cfdriver *); 174 static void config_devlink(device_t); 175 static void config_alldevs_unlock(int); 176 static int config_alldevs_lock(void); 177 static void config_alldevs_enter(struct alldevs_foray *); 178 static void config_alldevs_exit(struct alldevs_foray *); 179 static void config_add_attrib_dict(device_t); 180 181 static void config_collect_garbage(struct devicelist *); 182 static void config_dump_garbage(struct devicelist *); 183 184 static void pmflock_debug(device_t, const char *, int); 185 186 static device_t deviter_next1(deviter_t *); 187 static void deviter_reinit(deviter_t *); 188 189 struct deferred_config { 190 TAILQ_ENTRY(deferred_config) dc_queue; 191 device_t dc_dev; 192 void (*dc_func)(device_t); 193 }; 194 195 TAILQ_HEAD(deferred_config_head, deferred_config); 196 197 struct deferred_config_head deferred_config_queue = 198 TAILQ_HEAD_INITIALIZER(deferred_config_queue); 199 struct deferred_config_head interrupt_config_queue = 200 TAILQ_HEAD_INITIALIZER(interrupt_config_queue); 201 int interrupt_config_threads = 8; 202 struct deferred_config_head mountroot_config_queue = 203 TAILQ_HEAD_INITIALIZER(mountroot_config_queue); 204 int mountroot_config_threads = 2; 205 static lwp_t **mountroot_config_lwpids; 206 static size_t mountroot_config_lwpids_size; 207 static bool root_is_mounted = false; 208 209 static void config_process_deferred(struct deferred_config_head *, device_t); 210 211 /* Hooks to finalize configuration once all real devices have been found. */ 212 struct finalize_hook { 213 TAILQ_ENTRY(finalize_hook) f_list; 214 int (*f_func)(device_t); 215 device_t f_dev; 216 }; 217 static TAILQ_HEAD(, finalize_hook) config_finalize_list = 218 TAILQ_HEAD_INITIALIZER(config_finalize_list); 219 static int config_finalize_done; 220 221 /* list of all devices */ 222 static struct devicelist alldevs = TAILQ_HEAD_INITIALIZER(alldevs); 223 static kmutex_t alldevs_mtx; 224 static volatile bool alldevs_garbage = false; 225 static volatile devgen_t alldevs_gen = 1; 226 static volatile int alldevs_nread = 0; 227 static volatile int alldevs_nwrite = 0; 228 229 static int config_pending; /* semaphore for mountroot */ 230 static kmutex_t config_misc_lock; 231 static kcondvar_t config_misc_cv; 232 233 static bool detachall = false; 234 235 #define STREQ(s1, s2) \ 236 (*(s1) == *(s2) && strcmp((s1), (s2)) == 0) 237 238 static bool config_initialized = false; /* config_init() has been called. */ 239 240 static int config_do_twiddle; 241 static callout_t config_twiddle_ch; 242 243 static void sysctl_detach_setup(struct sysctllog **); 244 245 typedef int (*cfdriver_fn)(struct cfdriver *); 246 static int 247 frob_cfdrivervec(struct cfdriver * const *cfdriverv, 248 cfdriver_fn drv_do, cfdriver_fn drv_undo, 249 const char *style, bool dopanic) 250 { 251 void (*pr)(const char *, ...) __printflike(1, 2) = 252 dopanic ? panic : printf; 253 int i, error = 0, e2 __diagused; 254 255 for (i = 0; cfdriverv[i] != NULL; i++) { 256 if ((error = drv_do(cfdriverv[i])) != 0) { 257 pr("configure: `%s' driver %s failed: %d", 258 cfdriverv[i]->cd_name, style, error); 259 goto bad; 260 } 261 } 262 263 KASSERT(error == 0); 264 return 0; 265 266 bad: 267 printf("\n"); 268 for (i--; i >= 0; i--) { 269 e2 = drv_undo(cfdriverv[i]); 270 KASSERT(e2 == 0); 271 } 272 273 return error; 274 } 275 276 typedef int (*cfattach_fn)(const char *, struct cfattach *); 277 static int 278 frob_cfattachvec(const struct cfattachinit *cfattachv, 279 cfattach_fn att_do, cfattach_fn att_undo, 280 const char *style, bool dopanic) 281 { 282 const struct cfattachinit *cfai = NULL; 283 void (*pr)(const char *, ...) __printflike(1, 2) = 284 dopanic ? panic : printf; 285 int j = 0, error = 0, e2 __diagused; 286 287 for (cfai = &cfattachv[0]; cfai->cfai_name != NULL; cfai++) { 288 for (j = 0; cfai->cfai_list[j] != NULL; j++) { 289 if ((error = att_do(cfai->cfai_name, 290 cfai->cfai_list[j])) != 0) { 291 pr("configure: attachment `%s' " 292 "of `%s' driver %s failed: %d", 293 cfai->cfai_list[j]->ca_name, 294 cfai->cfai_name, style, error); 295 goto bad; 296 } 297 } 298 } 299 300 KASSERT(error == 0); 301 return 0; 302 303 bad: 304 /* 305 * Rollback in reverse order. dunno if super-important, but 306 * do that anyway. Although the code looks a little like 307 * someone did a little integration (in the math sense). 308 */ 309 printf("\n"); 310 if (cfai) { 311 bool last; 312 313 for (last = false; last == false; ) { 314 if (cfai == &cfattachv[0]) 315 last = true; 316 for (j--; j >= 0; j--) { 317 e2 = att_undo(cfai->cfai_name, 318 cfai->cfai_list[j]); 319 KASSERT(e2 == 0); 320 } 321 if (!last) { 322 cfai--; 323 for (j = 0; cfai->cfai_list[j] != NULL; j++) 324 ; 325 } 326 } 327 } 328 329 return error; 330 } 331 332 /* 333 * Initialize the autoconfiguration data structures. Normally this 334 * is done by configure(), but some platforms need to do this very 335 * early (to e.g. initialize the console). 336 */ 337 void 338 config_init(void) 339 { 340 341 KASSERT(config_initialized == false); 342 343 mutex_init(&alldevs_mtx, MUTEX_DEFAULT, IPL_VM); 344 345 mutex_init(&config_misc_lock, MUTEX_DEFAULT, IPL_NONE); 346 cv_init(&config_misc_cv, "cfgmisc"); 347 348 callout_init(&config_twiddle_ch, CALLOUT_MPSAFE); 349 350 frob_cfdrivervec(cfdriver_list_initial, 351 config_cfdriver_attach, NULL, "bootstrap", true); 352 frob_cfattachvec(cfattachinit, 353 config_cfattach_attach, NULL, "bootstrap", true); 354 355 initcftable.ct_cfdata = cfdata; 356 TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list); 357 358 config_initialized = true; 359 } 360 361 /* 362 * Init or fini drivers and attachments. Either all or none 363 * are processed (via rollback). It would be nice if this were 364 * atomic to outside consumers, but with the current state of 365 * locking ... 366 */ 367 int 368 config_init_component(struct cfdriver * const *cfdriverv, 369 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 370 { 371 int error; 372 373 if ((error = frob_cfdrivervec(cfdriverv, 374 config_cfdriver_attach, config_cfdriver_detach, "init", false))!= 0) 375 return error; 376 if ((error = frob_cfattachvec(cfattachv, 377 config_cfattach_attach, config_cfattach_detach, 378 "init", false)) != 0) { 379 frob_cfdrivervec(cfdriverv, 380 config_cfdriver_detach, NULL, "init rollback", true); 381 return error; 382 } 383 if ((error = config_cfdata_attach(cfdatav, 1)) != 0) { 384 frob_cfattachvec(cfattachv, 385 config_cfattach_detach, NULL, "init rollback", true); 386 frob_cfdrivervec(cfdriverv, 387 config_cfdriver_detach, NULL, "init rollback", true); 388 return error; 389 } 390 391 return 0; 392 } 393 394 int 395 config_fini_component(struct cfdriver * const *cfdriverv, 396 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 397 { 398 int error; 399 400 if ((error = config_cfdata_detach(cfdatav)) != 0) 401 return error; 402 if ((error = frob_cfattachvec(cfattachv, 403 config_cfattach_detach, config_cfattach_attach, 404 "fini", false)) != 0) { 405 if (config_cfdata_attach(cfdatav, 0) != 0) 406 panic("config_cfdata fini rollback failed"); 407 return error; 408 } 409 if ((error = frob_cfdrivervec(cfdriverv, 410 config_cfdriver_detach, config_cfdriver_attach, 411 "fini", false)) != 0) { 412 frob_cfattachvec(cfattachv, 413 config_cfattach_attach, NULL, "fini rollback", true); 414 if (config_cfdata_attach(cfdatav, 0) != 0) 415 panic("config_cfdata fini rollback failed"); 416 return error; 417 } 418 419 return 0; 420 } 421 422 void 423 config_init_mi(void) 424 { 425 426 if (!config_initialized) 427 config_init(); 428 429 sysctl_detach_setup(NULL); 430 } 431 432 void 433 config_deferred(device_t dev) 434 { 435 config_process_deferred(&deferred_config_queue, dev); 436 config_process_deferred(&interrupt_config_queue, dev); 437 config_process_deferred(&mountroot_config_queue, dev); 438 } 439 440 static void 441 config_interrupts_thread(void *cookie) 442 { 443 struct deferred_config *dc; 444 445 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 446 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 447 (*dc->dc_func)(dc->dc_dev); 448 config_pending_decr(dc->dc_dev); 449 kmem_free(dc, sizeof(*dc)); 450 } 451 kthread_exit(0); 452 } 453 454 void 455 config_create_interruptthreads(void) 456 { 457 int i; 458 459 for (i = 0; i < interrupt_config_threads; i++) { 460 (void)kthread_create(PRI_NONE, 0, NULL, 461 config_interrupts_thread, NULL, NULL, "configintr"); 462 } 463 } 464 465 static void 466 config_mountroot_thread(void *cookie) 467 { 468 struct deferred_config *dc; 469 470 while ((dc = TAILQ_FIRST(&mountroot_config_queue)) != NULL) { 471 TAILQ_REMOVE(&mountroot_config_queue, dc, dc_queue); 472 (*dc->dc_func)(dc->dc_dev); 473 kmem_free(dc, sizeof(*dc)); 474 } 475 kthread_exit(0); 476 } 477 478 void 479 config_create_mountrootthreads(void) 480 { 481 int i; 482 483 if (!root_is_mounted) 484 root_is_mounted = true; 485 486 mountroot_config_lwpids_size = sizeof(mountroot_config_lwpids) * 487 mountroot_config_threads; 488 mountroot_config_lwpids = kmem_alloc(mountroot_config_lwpids_size, 489 KM_NOSLEEP); 490 KASSERT(mountroot_config_lwpids); 491 for (i = 0; i < mountroot_config_threads; i++) { 492 mountroot_config_lwpids[i] = 0; 493 (void)kthread_create(PRI_NONE, KTHREAD_MUSTJOIN, NULL, 494 config_mountroot_thread, NULL, 495 &mountroot_config_lwpids[i], 496 "configroot"); 497 } 498 } 499 500 void 501 config_finalize_mountroot(void) 502 { 503 int i, error; 504 505 for (i = 0; i < mountroot_config_threads; i++) { 506 if (mountroot_config_lwpids[i] == 0) 507 continue; 508 509 error = kthread_join(mountroot_config_lwpids[i]); 510 if (error) 511 printf("%s: thread %x joined with error %d\n", 512 __func__, i, error); 513 } 514 kmem_free(mountroot_config_lwpids, mountroot_config_lwpids_size); 515 } 516 517 /* 518 * Announce device attach/detach to userland listeners. 519 */ 520 static void 521 devmon_report_device(device_t dev, bool isattach) 522 { 523 #if NDRVCTL > 0 524 prop_dictionary_t ev; 525 const char *parent; 526 const char *what; 527 device_t pdev = device_parent(dev); 528 529 ev = prop_dictionary_create(); 530 if (ev == NULL) 531 return; 532 533 what = (isattach ? "device-attach" : "device-detach"); 534 parent = (pdev == NULL ? "root" : device_xname(pdev)); 535 if (!prop_dictionary_set_cstring(ev, "device", device_xname(dev)) || 536 !prop_dictionary_set_cstring(ev, "parent", parent)) { 537 prop_object_release(ev); 538 return; 539 } 540 541 devmon_insert(what, ev); 542 #endif 543 } 544 545 /* 546 * Add a cfdriver to the system. 547 */ 548 int 549 config_cfdriver_attach(struct cfdriver *cd) 550 { 551 struct cfdriver *lcd; 552 553 /* Make sure this driver isn't already in the system. */ 554 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 555 if (STREQ(lcd->cd_name, cd->cd_name)) 556 return EEXIST; 557 } 558 559 LIST_INIT(&cd->cd_attach); 560 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 561 562 return 0; 563 } 564 565 /* 566 * Remove a cfdriver from the system. 567 */ 568 int 569 config_cfdriver_detach(struct cfdriver *cd) 570 { 571 struct alldevs_foray af; 572 int i, rc = 0; 573 574 config_alldevs_enter(&af); 575 /* Make sure there are no active instances. */ 576 for (i = 0; i < cd->cd_ndevs; i++) { 577 if (cd->cd_devs[i] != NULL) { 578 rc = EBUSY; 579 break; 580 } 581 } 582 config_alldevs_exit(&af); 583 584 if (rc != 0) 585 return rc; 586 587 /* ...and no attachments loaded. */ 588 if (LIST_EMPTY(&cd->cd_attach) == 0) 589 return EBUSY; 590 591 LIST_REMOVE(cd, cd_list); 592 593 KASSERT(cd->cd_devs == NULL); 594 595 return 0; 596 } 597 598 /* 599 * Look up a cfdriver by name. 600 */ 601 struct cfdriver * 602 config_cfdriver_lookup(const char *name) 603 { 604 struct cfdriver *cd; 605 606 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 607 if (STREQ(cd->cd_name, name)) 608 return cd; 609 } 610 611 return NULL; 612 } 613 614 /* 615 * Add a cfattach to the specified driver. 616 */ 617 int 618 config_cfattach_attach(const char *driver, struct cfattach *ca) 619 { 620 struct cfattach *lca; 621 struct cfdriver *cd; 622 623 cd = config_cfdriver_lookup(driver); 624 if (cd == NULL) 625 return ESRCH; 626 627 /* Make sure this attachment isn't already on this driver. */ 628 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 629 if (STREQ(lca->ca_name, ca->ca_name)) 630 return EEXIST; 631 } 632 633 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 634 635 return 0; 636 } 637 638 /* 639 * Remove a cfattach from the specified driver. 640 */ 641 int 642 config_cfattach_detach(const char *driver, struct cfattach *ca) 643 { 644 struct alldevs_foray af; 645 struct cfdriver *cd; 646 device_t dev; 647 int i, rc = 0; 648 649 cd = config_cfdriver_lookup(driver); 650 if (cd == NULL) 651 return ESRCH; 652 653 config_alldevs_enter(&af); 654 /* Make sure there are no active instances. */ 655 for (i = 0; i < cd->cd_ndevs; i++) { 656 if ((dev = cd->cd_devs[i]) == NULL) 657 continue; 658 if (dev->dv_cfattach == ca) { 659 rc = EBUSY; 660 break; 661 } 662 } 663 config_alldevs_exit(&af); 664 665 if (rc != 0) 666 return rc; 667 668 LIST_REMOVE(ca, ca_list); 669 670 return 0; 671 } 672 673 /* 674 * Look up a cfattach by name. 675 */ 676 static struct cfattach * 677 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 678 { 679 struct cfattach *ca; 680 681 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 682 if (STREQ(ca->ca_name, atname)) 683 return ca; 684 } 685 686 return NULL; 687 } 688 689 /* 690 * Look up a cfattach by driver/attachment name. 691 */ 692 struct cfattach * 693 config_cfattach_lookup(const char *name, const char *atname) 694 { 695 struct cfdriver *cd; 696 697 cd = config_cfdriver_lookup(name); 698 if (cd == NULL) 699 return NULL; 700 701 return config_cfattach_lookup_cd(cd, atname); 702 } 703 704 /* 705 * Apply the matching function and choose the best. This is used 706 * a few times and we want to keep the code small. 707 */ 708 static void 709 mapply(struct matchinfo *m, cfdata_t cf) 710 { 711 int pri; 712 713 if (m->fn != NULL) { 714 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 715 } else { 716 pri = config_match(m->parent, cf, m->aux); 717 } 718 if (pri > m->pri) { 719 m->match = cf; 720 m->pri = pri; 721 } 722 } 723 724 int 725 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 726 { 727 const struct cfiattrdata *ci; 728 const struct cflocdesc *cl; 729 int nlocs, i; 730 731 ci = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 732 KASSERT(ci); 733 nlocs = ci->ci_loclen; 734 KASSERT(!nlocs || locs); 735 for (i = 0; i < nlocs; i++) { 736 cl = &ci->ci_locdesc[i]; 737 if (cl->cld_defaultstr != NULL && 738 cf->cf_loc[i] == cl->cld_default) 739 continue; 740 if (cf->cf_loc[i] == locs[i]) 741 continue; 742 return 0; 743 } 744 745 return config_match(parent, cf, aux); 746 } 747 748 /* 749 * Helper function: check whether the driver supports the interface attribute 750 * and return its descriptor structure. 751 */ 752 static const struct cfiattrdata * 753 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 754 { 755 const struct cfiattrdata * const *cpp; 756 757 if (cd->cd_attrs == NULL) 758 return 0; 759 760 for (cpp = cd->cd_attrs; *cpp; cpp++) { 761 if (STREQ((*cpp)->ci_name, ia)) { 762 /* Match. */ 763 return *cpp; 764 } 765 } 766 return 0; 767 } 768 769 /* 770 * Lookup an interface attribute description by name. 771 * If the driver is given, consider only its supported attributes. 772 */ 773 const struct cfiattrdata * 774 cfiattr_lookup(const char *name, const struct cfdriver *cd) 775 { 776 const struct cfdriver *d; 777 const struct cfiattrdata *ia; 778 779 if (cd) 780 return cfdriver_get_iattr(cd, name); 781 782 LIST_FOREACH(d, &allcfdrivers, cd_list) { 783 ia = cfdriver_get_iattr(d, name); 784 if (ia) 785 return ia; 786 } 787 return 0; 788 } 789 790 /* 791 * Determine if `parent' is a potential parent for a device spec based 792 * on `cfp'. 793 */ 794 static int 795 cfparent_match(const device_t parent, const struct cfparent *cfp) 796 { 797 struct cfdriver *pcd; 798 799 /* We don't match root nodes here. */ 800 if (cfp == NULL) 801 return 0; 802 803 pcd = parent->dv_cfdriver; 804 KASSERT(pcd != NULL); 805 806 /* 807 * First, ensure this parent has the correct interface 808 * attribute. 809 */ 810 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 811 return 0; 812 813 /* 814 * If no specific parent device instance was specified (i.e. 815 * we're attaching to the attribute only), we're done! 816 */ 817 if (cfp->cfp_parent == NULL) 818 return 1; 819 820 /* 821 * Check the parent device's name. 822 */ 823 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 824 return 0; /* not the same parent */ 825 826 /* 827 * Make sure the unit number matches. 828 */ 829 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 830 cfp->cfp_unit == parent->dv_unit) 831 return 1; 832 833 /* Unit numbers don't match. */ 834 return 0; 835 } 836 837 /* 838 * Helper for config_cfdata_attach(): check all devices whether it could be 839 * parent any attachment in the config data table passed, and rescan. 840 */ 841 static void 842 rescan_with_cfdata(const struct cfdata *cf) 843 { 844 device_t d; 845 const struct cfdata *cf1; 846 deviter_t di; 847 848 849 /* 850 * "alldevs" is likely longer than a modules's cfdata, so make it 851 * the outer loop. 852 */ 853 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 854 855 if (!(d->dv_cfattach->ca_rescan)) 856 continue; 857 858 for (cf1 = cf; cf1->cf_name; cf1++) { 859 860 if (!cfparent_match(d, cf1->cf_pspec)) 861 continue; 862 863 (*d->dv_cfattach->ca_rescan)(d, 864 cfdata_ifattr(cf1), cf1->cf_loc); 865 866 config_deferred(d); 867 } 868 } 869 deviter_release(&di); 870 } 871 872 /* 873 * Attach a supplemental config data table and rescan potential 874 * parent devices if required. 875 */ 876 int 877 config_cfdata_attach(cfdata_t cf, int scannow) 878 { 879 struct cftable *ct; 880 881 ct = kmem_alloc(sizeof(*ct), KM_SLEEP); 882 ct->ct_cfdata = cf; 883 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 884 885 if (scannow) 886 rescan_with_cfdata(cf); 887 888 return 0; 889 } 890 891 /* 892 * Helper for config_cfdata_detach: check whether a device is 893 * found through any attachment in the config data table. 894 */ 895 static int 896 dev_in_cfdata(device_t d, cfdata_t cf) 897 { 898 const struct cfdata *cf1; 899 900 for (cf1 = cf; cf1->cf_name; cf1++) 901 if (d->dv_cfdata == cf1) 902 return 1; 903 904 return 0; 905 } 906 907 /* 908 * Detach a supplemental config data table. Detach all devices found 909 * through that table (and thus keeping references to it) before. 910 */ 911 int 912 config_cfdata_detach(cfdata_t cf) 913 { 914 device_t d; 915 int error = 0; 916 struct cftable *ct; 917 deviter_t di; 918 919 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 920 d = deviter_next(&di)) { 921 if (!dev_in_cfdata(d, cf)) 922 continue; 923 if ((error = config_detach(d, 0)) != 0) 924 break; 925 } 926 deviter_release(&di); 927 if (error) { 928 aprint_error_dev(d, "unable to detach instance\n"); 929 return error; 930 } 931 932 TAILQ_FOREACH(ct, &allcftables, ct_list) { 933 if (ct->ct_cfdata == cf) { 934 TAILQ_REMOVE(&allcftables, ct, ct_list); 935 kmem_free(ct, sizeof(*ct)); 936 return 0; 937 } 938 } 939 940 /* not found -- shouldn't happen */ 941 return EINVAL; 942 } 943 944 /* 945 * Invoke the "match" routine for a cfdata entry on behalf of 946 * an external caller, usually a "submatch" routine. 947 */ 948 int 949 config_match(device_t parent, cfdata_t cf, void *aux) 950 { 951 struct cfattach *ca; 952 953 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 954 if (ca == NULL) { 955 /* No attachment for this entry, oh well. */ 956 return 0; 957 } 958 959 return (*ca->ca_match)(parent, cf, aux); 960 } 961 962 /* 963 * Iterate over all potential children of some device, calling the given 964 * function (default being the child's match function) for each one. 965 * Nonzero returns are matches; the highest value returned is considered 966 * the best match. Return the `found child' if we got a match, or NULL 967 * otherwise. The `aux' pointer is simply passed on through. 968 * 969 * Note that this function is designed so that it can be used to apply 970 * an arbitrary function to all potential children (its return value 971 * can be ignored). 972 */ 973 cfdata_t 974 config_search_loc(cfsubmatch_t fn, device_t parent, 975 const char *ifattr, const int *locs, void *aux) 976 { 977 struct cftable *ct; 978 cfdata_t cf; 979 struct matchinfo m; 980 981 KASSERT(config_initialized); 982 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 983 984 m.fn = fn; 985 m.parent = parent; 986 m.locs = locs; 987 m.aux = aux; 988 m.match = NULL; 989 m.pri = 0; 990 991 TAILQ_FOREACH(ct, &allcftables, ct_list) { 992 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 993 994 /* We don't match root nodes here. */ 995 if (!cf->cf_pspec) 996 continue; 997 998 /* 999 * Skip cf if no longer eligible, otherwise scan 1000 * through parents for one matching `parent', and 1001 * try match function. 1002 */ 1003 if (cf->cf_fstate == FSTATE_FOUND) 1004 continue; 1005 if (cf->cf_fstate == FSTATE_DNOTFOUND || 1006 cf->cf_fstate == FSTATE_DSTAR) 1007 continue; 1008 1009 /* 1010 * If an interface attribute was specified, 1011 * consider only children which attach to 1012 * that attribute. 1013 */ 1014 if (ifattr && !STREQ(ifattr, cfdata_ifattr(cf))) 1015 continue; 1016 1017 if (cfparent_match(parent, cf->cf_pspec)) 1018 mapply(&m, cf); 1019 } 1020 } 1021 return m.match; 1022 } 1023 1024 cfdata_t 1025 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 1026 void *aux) 1027 { 1028 1029 return config_search_loc(fn, parent, ifattr, NULL, aux); 1030 } 1031 1032 /* 1033 * Find the given root device. 1034 * This is much like config_search, but there is no parent. 1035 * Don't bother with multiple cfdata tables; the root node 1036 * must always be in the initial table. 1037 */ 1038 cfdata_t 1039 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 1040 { 1041 cfdata_t cf; 1042 const short *p; 1043 struct matchinfo m; 1044 1045 m.fn = fn; 1046 m.parent = ROOT; 1047 m.aux = aux; 1048 m.match = NULL; 1049 m.pri = 0; 1050 m.locs = 0; 1051 /* 1052 * Look at root entries for matching name. We do not bother 1053 * with found-state here since only one root should ever be 1054 * searched (and it must be done first). 1055 */ 1056 for (p = cfroots; *p >= 0; p++) { 1057 cf = &cfdata[*p]; 1058 if (strcmp(cf->cf_name, rootname) == 0) 1059 mapply(&m, cf); 1060 } 1061 return m.match; 1062 } 1063 1064 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 1065 1066 /* 1067 * The given `aux' argument describes a device that has been found 1068 * on the given parent, but not necessarily configured. Locate the 1069 * configuration data for that device (using the submatch function 1070 * provided, or using candidates' cd_match configuration driver 1071 * functions) and attach it, and return its device_t. If the device was 1072 * not configured, call the given `print' function and return NULL. 1073 */ 1074 device_t 1075 config_found_sm_loc(device_t parent, 1076 const char *ifattr, const int *locs, void *aux, 1077 cfprint_t print, cfsubmatch_t submatch) 1078 { 1079 cfdata_t cf; 1080 1081 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 1082 return(config_attach_loc(parent, cf, locs, aux, print)); 1083 if (print) { 1084 if (config_do_twiddle && cold) 1085 twiddle(); 1086 aprint_normal("%s", msgs[(*print)(aux, device_xname(parent))]); 1087 } 1088 1089 /* 1090 * This has the effect of mixing in a single timestamp to the 1091 * entropy pool. Experiments indicate the estimator will almost 1092 * always attribute one bit of entropy to this sample; analysis 1093 * of device attach/detach timestamps on FreeBSD indicates 4 1094 * bits of entropy/sample so this seems appropriately conservative. 1095 */ 1096 rnd_add_uint32(&rnd_autoconf_source, 0); 1097 return NULL; 1098 } 1099 1100 device_t 1101 config_found_ia(device_t parent, const char *ifattr, void *aux, 1102 cfprint_t print) 1103 { 1104 1105 return config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL); 1106 } 1107 1108 device_t 1109 config_found(device_t parent, void *aux, cfprint_t print) 1110 { 1111 1112 return config_found_sm_loc(parent, NULL, NULL, aux, print, NULL); 1113 } 1114 1115 /* 1116 * As above, but for root devices. 1117 */ 1118 device_t 1119 config_rootfound(const char *rootname, void *aux) 1120 { 1121 cfdata_t cf; 1122 1123 if ((cf = config_rootsearch(NULL, rootname, aux)) != NULL) 1124 return config_attach(ROOT, cf, aux, NULL); 1125 aprint_error("root device %s not configured\n", rootname); 1126 return NULL; 1127 } 1128 1129 /* just like sprintf(buf, "%d") except that it works from the end */ 1130 static char * 1131 number(char *ep, int n) 1132 { 1133 1134 *--ep = 0; 1135 while (n >= 10) { 1136 *--ep = (n % 10) + '0'; 1137 n /= 10; 1138 } 1139 *--ep = n + '0'; 1140 return ep; 1141 } 1142 1143 /* 1144 * Expand the size of the cd_devs array if necessary. 1145 * 1146 * The caller must hold alldevs_mtx. config_makeroom() may release and 1147 * re-acquire alldevs_mtx, so callers should re-check conditions such 1148 * as alldevs_nwrite == 0 and alldevs_nread == 0 when config_makeroom() 1149 * returns. 1150 */ 1151 static void 1152 config_makeroom(int n, struct cfdriver *cd) 1153 { 1154 int ondevs, nndevs; 1155 device_t *osp, *nsp; 1156 1157 alldevs_nwrite++; 1158 1159 for (nndevs = MAX(4, cd->cd_ndevs); nndevs <= n; nndevs += nndevs) 1160 ; 1161 1162 while (n >= cd->cd_ndevs) { 1163 /* 1164 * Need to expand the array. 1165 */ 1166 ondevs = cd->cd_ndevs; 1167 osp = cd->cd_devs; 1168 1169 /* Release alldevs_mtx around allocation, which may 1170 * sleep. 1171 */ 1172 mutex_exit(&alldevs_mtx); 1173 nsp = kmem_alloc(sizeof(device_t[nndevs]), KM_SLEEP); 1174 if (nsp == NULL) 1175 panic("%s: could not expand cd_devs", __func__); 1176 mutex_enter(&alldevs_mtx); 1177 1178 /* If another thread moved the array while we did 1179 * not hold alldevs_mtx, try again. 1180 */ 1181 if (cd->cd_devs != osp) { 1182 mutex_exit(&alldevs_mtx); 1183 kmem_free(nsp, sizeof(device_t[nndevs])); 1184 mutex_enter(&alldevs_mtx); 1185 continue; 1186 } 1187 1188 memset(nsp + ondevs, 0, sizeof(device_t[nndevs - ondevs])); 1189 if (ondevs != 0) 1190 memcpy(nsp, cd->cd_devs, sizeof(device_t[ondevs])); 1191 1192 cd->cd_ndevs = nndevs; 1193 cd->cd_devs = nsp; 1194 if (ondevs != 0) { 1195 mutex_exit(&alldevs_mtx); 1196 kmem_free(osp, sizeof(device_t[ondevs])); 1197 mutex_enter(&alldevs_mtx); 1198 } 1199 } 1200 alldevs_nwrite--; 1201 } 1202 1203 /* 1204 * Put dev into the devices list. 1205 */ 1206 static void 1207 config_devlink(device_t dev) 1208 { 1209 int s; 1210 1211 s = config_alldevs_lock(); 1212 1213 KASSERT(device_cfdriver(dev)->cd_devs[dev->dv_unit] == dev); 1214 1215 dev->dv_add_gen = alldevs_gen; 1216 /* It is safe to add a device to the tail of the list while 1217 * readers and writers are in the list. 1218 */ 1219 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); 1220 config_alldevs_unlock(s); 1221 } 1222 1223 static void 1224 config_devfree(device_t dev) 1225 { 1226 int priv = (dev->dv_flags & DVF_PRIV_ALLOC); 1227 1228 if (dev->dv_cfattach->ca_devsize > 0) 1229 kmem_free(dev->dv_private, dev->dv_cfattach->ca_devsize); 1230 if (priv) 1231 kmem_free(dev, sizeof(*dev)); 1232 } 1233 1234 /* 1235 * Caller must hold alldevs_mtx. 1236 */ 1237 static void 1238 config_devunlink(device_t dev, struct devicelist *garbage) 1239 { 1240 struct device_garbage *dg = &dev->dv_garbage; 1241 cfdriver_t cd = device_cfdriver(dev); 1242 int i; 1243 1244 KASSERT(mutex_owned(&alldevs_mtx)); 1245 1246 /* Unlink from device list. Link to garbage list. */ 1247 TAILQ_REMOVE(&alldevs, dev, dv_list); 1248 TAILQ_INSERT_TAIL(garbage, dev, dv_list); 1249 1250 /* Remove from cfdriver's array. */ 1251 cd->cd_devs[dev->dv_unit] = NULL; 1252 1253 /* 1254 * If the device now has no units in use, unlink its softc array. 1255 */ 1256 for (i = 0; i < cd->cd_ndevs; i++) { 1257 if (cd->cd_devs[i] != NULL) 1258 break; 1259 } 1260 /* Nothing found. Unlink, now. Deallocate, later. */ 1261 if (i == cd->cd_ndevs) { 1262 dg->dg_ndevs = cd->cd_ndevs; 1263 dg->dg_devs = cd->cd_devs; 1264 cd->cd_devs = NULL; 1265 cd->cd_ndevs = 0; 1266 } 1267 } 1268 1269 static void 1270 config_devdelete(device_t dev) 1271 { 1272 struct device_garbage *dg = &dev->dv_garbage; 1273 device_lock_t dvl = device_getlock(dev); 1274 1275 if (dg->dg_devs != NULL) 1276 kmem_free(dg->dg_devs, sizeof(device_t[dg->dg_ndevs])); 1277 1278 cv_destroy(&dvl->dvl_cv); 1279 mutex_destroy(&dvl->dvl_mtx); 1280 1281 KASSERT(dev->dv_properties != NULL); 1282 prop_object_release(dev->dv_properties); 1283 1284 if (dev->dv_activity_handlers) 1285 panic("%s with registered handlers", __func__); 1286 1287 if (dev->dv_locators) { 1288 size_t amount = *--dev->dv_locators; 1289 kmem_free(dev->dv_locators, amount); 1290 } 1291 1292 config_devfree(dev); 1293 } 1294 1295 static int 1296 config_unit_nextfree(cfdriver_t cd, cfdata_t cf) 1297 { 1298 int unit; 1299 1300 if (cf->cf_fstate == FSTATE_STAR) { 1301 for (unit = cf->cf_unit; unit < cd->cd_ndevs; unit++) 1302 if (cd->cd_devs[unit] == NULL) 1303 break; 1304 /* 1305 * unit is now the unit of the first NULL device pointer, 1306 * or max(cd->cd_ndevs,cf->cf_unit). 1307 */ 1308 } else { 1309 unit = cf->cf_unit; 1310 if (unit < cd->cd_ndevs && cd->cd_devs[unit] != NULL) 1311 unit = -1; 1312 } 1313 return unit; 1314 } 1315 1316 static int 1317 config_unit_alloc(device_t dev, cfdriver_t cd, cfdata_t cf) 1318 { 1319 struct alldevs_foray af; 1320 int unit; 1321 1322 config_alldevs_enter(&af); 1323 for (;;) { 1324 unit = config_unit_nextfree(cd, cf); 1325 if (unit == -1) 1326 break; 1327 if (unit < cd->cd_ndevs) { 1328 cd->cd_devs[unit] = dev; 1329 dev->dv_unit = unit; 1330 break; 1331 } 1332 config_makeroom(unit, cd); 1333 } 1334 config_alldevs_exit(&af); 1335 1336 return unit; 1337 } 1338 1339 static device_t 1340 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1341 { 1342 cfdriver_t cd; 1343 cfattach_t ca; 1344 size_t lname, lunit; 1345 const char *xunit; 1346 int myunit; 1347 char num[10]; 1348 device_t dev; 1349 void *dev_private; 1350 const struct cfiattrdata *ia; 1351 device_lock_t dvl; 1352 1353 cd = config_cfdriver_lookup(cf->cf_name); 1354 if (cd == NULL) 1355 return NULL; 1356 1357 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1358 if (ca == NULL) 1359 return NULL; 1360 1361 if ((ca->ca_flags & DVF_PRIV_ALLOC) == 0 && 1362 ca->ca_devsize < sizeof(struct device)) 1363 panic("config_devalloc: %s (%zu < %zu)", cf->cf_atname, 1364 ca->ca_devsize, sizeof(struct device)); 1365 1366 /* get memory for all device vars */ 1367 KASSERT((ca->ca_flags & DVF_PRIV_ALLOC) || ca->ca_devsize >= sizeof(struct device)); 1368 if (ca->ca_devsize > 0) { 1369 dev_private = kmem_zalloc(ca->ca_devsize, KM_SLEEP); 1370 if (dev_private == NULL) 1371 panic("config_devalloc: memory allocation for device softc failed"); 1372 } else { 1373 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1374 dev_private = NULL; 1375 } 1376 1377 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1378 dev = kmem_zalloc(sizeof(*dev), KM_SLEEP); 1379 } else { 1380 dev = dev_private; 1381 #ifdef DIAGNOSTIC 1382 printf("%s has not been converted to device_t\n", cd->cd_name); 1383 #endif 1384 } 1385 if (dev == NULL) 1386 panic("config_devalloc: memory allocation for device_t failed"); 1387 1388 dev->dv_class = cd->cd_class; 1389 dev->dv_cfdata = cf; 1390 dev->dv_cfdriver = cd; 1391 dev->dv_cfattach = ca; 1392 dev->dv_activity_count = 0; 1393 dev->dv_activity_handlers = NULL; 1394 dev->dv_private = dev_private; 1395 dev->dv_flags = ca->ca_flags; /* inherit flags from class */ 1396 1397 myunit = config_unit_alloc(dev, cd, cf); 1398 if (myunit == -1) { 1399 config_devfree(dev); 1400 return NULL; 1401 } 1402 1403 /* compute length of name and decimal expansion of unit number */ 1404 lname = strlen(cd->cd_name); 1405 xunit = number(&num[sizeof(num)], myunit); 1406 lunit = &num[sizeof(num)] - xunit; 1407 if (lname + lunit > sizeof(dev->dv_xname)) 1408 panic("config_devalloc: device name too long"); 1409 1410 dvl = device_getlock(dev); 1411 1412 mutex_init(&dvl->dvl_mtx, MUTEX_DEFAULT, IPL_NONE); 1413 cv_init(&dvl->dvl_cv, "pmfsusp"); 1414 1415 memcpy(dev->dv_xname, cd->cd_name, lname); 1416 memcpy(dev->dv_xname + lname, xunit, lunit); 1417 dev->dv_parent = parent; 1418 if (parent != NULL) 1419 dev->dv_depth = parent->dv_depth + 1; 1420 else 1421 dev->dv_depth = 0; 1422 dev->dv_flags |= DVF_ACTIVE; /* always initially active */ 1423 if (locs) { 1424 KASSERT(parent); /* no locators at root */ 1425 ia = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 1426 dev->dv_locators = 1427 kmem_alloc(sizeof(int [ia->ci_loclen + 1]), KM_SLEEP); 1428 *dev->dv_locators++ = sizeof(int [ia->ci_loclen + 1]); 1429 memcpy(dev->dv_locators, locs, sizeof(int [ia->ci_loclen])); 1430 } 1431 dev->dv_properties = prop_dictionary_create(); 1432 KASSERT(dev->dv_properties != NULL); 1433 1434 prop_dictionary_set_cstring_nocopy(dev->dv_properties, 1435 "device-driver", dev->dv_cfdriver->cd_name); 1436 prop_dictionary_set_uint16(dev->dv_properties, 1437 "device-unit", dev->dv_unit); 1438 if (parent != NULL) { 1439 prop_dictionary_set_cstring(dev->dv_properties, 1440 "device-parent", device_xname(parent)); 1441 } 1442 1443 if (dev->dv_cfdriver->cd_attrs != NULL) 1444 config_add_attrib_dict(dev); 1445 1446 return dev; 1447 } 1448 1449 /* 1450 * Create an array of device attach attributes and add it 1451 * to the device's dv_properties dictionary. 1452 * 1453 * <key>interface-attributes</key> 1454 * <array> 1455 * <dict> 1456 * <key>attribute-name</key> 1457 * <string>foo</string> 1458 * <key>locators</key> 1459 * <array> 1460 * <dict> 1461 * <key>loc-name</key> 1462 * <string>foo-loc1</string> 1463 * </dict> 1464 * <dict> 1465 * <key>loc-name</key> 1466 * <string>foo-loc2</string> 1467 * <key>default</key> 1468 * <string>foo-loc2-default</string> 1469 * </dict> 1470 * ... 1471 * </array> 1472 * </dict> 1473 * ... 1474 * </array> 1475 */ 1476 1477 static void 1478 config_add_attrib_dict(device_t dev) 1479 { 1480 int i, j; 1481 const struct cfiattrdata *ci; 1482 prop_dictionary_t attr_dict, loc_dict; 1483 prop_array_t attr_array, loc_array; 1484 1485 if ((attr_array = prop_array_create()) == NULL) 1486 return; 1487 1488 for (i = 0; ; i++) { 1489 if ((ci = dev->dv_cfdriver->cd_attrs[i]) == NULL) 1490 break; 1491 if ((attr_dict = prop_dictionary_create()) == NULL) 1492 break; 1493 prop_dictionary_set_cstring_nocopy(attr_dict, "attribute-name", 1494 ci->ci_name); 1495 1496 /* Create an array of the locator names and defaults */ 1497 1498 if (ci->ci_loclen != 0 && 1499 (loc_array = prop_array_create()) != NULL) { 1500 for (j = 0; j < ci->ci_loclen; j++) { 1501 loc_dict = prop_dictionary_create(); 1502 if (loc_dict == NULL) 1503 continue; 1504 prop_dictionary_set_cstring_nocopy(loc_dict, 1505 "loc-name", ci->ci_locdesc[j].cld_name); 1506 if (ci->ci_locdesc[j].cld_defaultstr != NULL) 1507 prop_dictionary_set_cstring_nocopy( 1508 loc_dict, "default", 1509 ci->ci_locdesc[j].cld_defaultstr); 1510 prop_array_set(loc_array, j, loc_dict); 1511 prop_object_release(loc_dict); 1512 } 1513 prop_dictionary_set_and_rel(attr_dict, "locators", 1514 loc_array); 1515 } 1516 prop_array_add(attr_array, attr_dict); 1517 prop_object_release(attr_dict); 1518 } 1519 if (i == 0) 1520 prop_object_release(attr_array); 1521 else 1522 prop_dictionary_set_and_rel(dev->dv_properties, 1523 "interface-attributes", attr_array); 1524 1525 return; 1526 } 1527 1528 /* 1529 * Attach a found device. 1530 */ 1531 device_t 1532 config_attach_loc(device_t parent, cfdata_t cf, 1533 const int *locs, void *aux, cfprint_t print) 1534 { 1535 device_t dev; 1536 struct cftable *ct; 1537 const char *drvname; 1538 1539 dev = config_devalloc(parent, cf, locs); 1540 if (!dev) 1541 panic("config_attach: allocation of device softc failed"); 1542 1543 /* XXX redundant - see below? */ 1544 if (cf->cf_fstate != FSTATE_STAR) { 1545 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1546 cf->cf_fstate = FSTATE_FOUND; 1547 } 1548 1549 config_devlink(dev); 1550 1551 if (config_do_twiddle && cold) 1552 twiddle(); 1553 else 1554 aprint_naive("Found "); 1555 /* 1556 * We want the next two printfs for normal, verbose, and quiet, 1557 * but not silent (in which case, we're twiddling, instead). 1558 */ 1559 if (parent == ROOT) { 1560 aprint_naive("%s (root)", device_xname(dev)); 1561 aprint_normal("%s (root)", device_xname(dev)); 1562 } else { 1563 aprint_naive("%s at %s", device_xname(dev), device_xname(parent)); 1564 aprint_normal("%s at %s", device_xname(dev), device_xname(parent)); 1565 if (print) 1566 (void) (*print)(aux, NULL); 1567 } 1568 1569 /* 1570 * Before attaching, clobber any unfound devices that are 1571 * otherwise identical. 1572 * XXX code above is redundant? 1573 */ 1574 drvname = dev->dv_cfdriver->cd_name; 1575 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1576 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1577 if (STREQ(cf->cf_name, drvname) && 1578 cf->cf_unit == dev->dv_unit) { 1579 if (cf->cf_fstate == FSTATE_NOTFOUND) 1580 cf->cf_fstate = FSTATE_FOUND; 1581 } 1582 } 1583 } 1584 device_register(dev, aux); 1585 1586 /* Let userland know */ 1587 devmon_report_device(dev, true); 1588 1589 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1590 1591 if (!device_pmf_is_registered(dev)) 1592 aprint_debug_dev(dev, "WARNING: power management not supported\n"); 1593 1594 config_process_deferred(&deferred_config_queue, dev); 1595 1596 device_register_post_config(dev, aux); 1597 return dev; 1598 } 1599 1600 device_t 1601 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1602 { 1603 1604 return config_attach_loc(parent, cf, NULL, aux, print); 1605 } 1606 1607 /* 1608 * As above, but for pseudo-devices. Pseudo-devices attached in this 1609 * way are silently inserted into the device tree, and their children 1610 * attached. 1611 * 1612 * Note that because pseudo-devices are attached silently, any information 1613 * the attach routine wishes to print should be prefixed with the device 1614 * name by the attach routine. 1615 */ 1616 device_t 1617 config_attach_pseudo(cfdata_t cf) 1618 { 1619 device_t dev; 1620 1621 dev = config_devalloc(ROOT, cf, NULL); 1622 if (!dev) 1623 return NULL; 1624 1625 /* XXX mark busy in cfdata */ 1626 1627 if (cf->cf_fstate != FSTATE_STAR) { 1628 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1629 cf->cf_fstate = FSTATE_FOUND; 1630 } 1631 1632 config_devlink(dev); 1633 1634 #if 0 /* XXXJRT not yet */ 1635 device_register(dev, NULL); /* like a root node */ 1636 #endif 1637 1638 /* Let userland know */ 1639 devmon_report_device(dev, true); 1640 1641 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1642 1643 config_process_deferred(&deferred_config_queue, dev); 1644 return dev; 1645 } 1646 1647 /* 1648 * Caller must hold alldevs_mtx. 1649 */ 1650 static void 1651 config_collect_garbage(struct devicelist *garbage) 1652 { 1653 device_t dv; 1654 1655 KASSERT(!cpu_intr_p()); 1656 KASSERT(!cpu_softintr_p()); 1657 KASSERT(mutex_owned(&alldevs_mtx)); 1658 1659 while (alldevs_nwrite == 0 && alldevs_nread == 0 && alldevs_garbage) { 1660 TAILQ_FOREACH(dv, &alldevs, dv_list) { 1661 if (dv->dv_del_gen != 0) 1662 break; 1663 } 1664 if (dv == NULL) { 1665 alldevs_garbage = false; 1666 break; 1667 } 1668 config_devunlink(dv, garbage); 1669 } 1670 KASSERT(mutex_owned(&alldevs_mtx)); 1671 } 1672 1673 static void 1674 config_dump_garbage(struct devicelist *garbage) 1675 { 1676 device_t dv; 1677 1678 while ((dv = TAILQ_FIRST(garbage)) != NULL) { 1679 TAILQ_REMOVE(garbage, dv, dv_list); 1680 config_devdelete(dv); 1681 } 1682 } 1683 1684 /* 1685 * Detach a device. Optionally forced (e.g. because of hardware 1686 * removal) and quiet. Returns zero if successful, non-zero 1687 * (an error code) otherwise. 1688 * 1689 * Note that this code wants to be run from a process context, so 1690 * that the detach can sleep to allow processes which have a device 1691 * open to run and unwind their stacks. 1692 */ 1693 int 1694 config_detach(device_t dev, int flags) 1695 { 1696 struct alldevs_foray af; 1697 struct cftable *ct; 1698 cfdata_t cf; 1699 const struct cfattach *ca; 1700 struct cfdriver *cd; 1701 #ifdef DIAGNOSTIC 1702 device_t d; 1703 #endif 1704 int rv = 0, s; 1705 1706 #ifdef DIAGNOSTIC 1707 cf = dev->dv_cfdata; 1708 if (cf != NULL && cf->cf_fstate != FSTATE_FOUND && 1709 cf->cf_fstate != FSTATE_STAR) 1710 panic("config_detach: %s: bad device fstate %d", 1711 device_xname(dev), cf ? cf->cf_fstate : -1); 1712 #endif 1713 cd = dev->dv_cfdriver; 1714 KASSERT(cd != NULL); 1715 1716 ca = dev->dv_cfattach; 1717 KASSERT(ca != NULL); 1718 1719 s = config_alldevs_lock(); 1720 if (dev->dv_del_gen != 0) { 1721 config_alldevs_unlock(s); 1722 #ifdef DIAGNOSTIC 1723 printf("%s: %s is already detached\n", __func__, 1724 device_xname(dev)); 1725 #endif /* DIAGNOSTIC */ 1726 return ENOENT; 1727 } 1728 alldevs_nwrite++; 1729 config_alldevs_unlock(s); 1730 1731 if (!detachall && 1732 (flags & (DETACH_SHUTDOWN|DETACH_FORCE)) == DETACH_SHUTDOWN && 1733 (dev->dv_flags & DVF_DETACH_SHUTDOWN) == 0) { 1734 rv = EOPNOTSUPP; 1735 } else if (ca->ca_detach != NULL) { 1736 rv = (*ca->ca_detach)(dev, flags); 1737 } else 1738 rv = EOPNOTSUPP; 1739 1740 /* 1741 * If it was not possible to detach the device, then we either 1742 * panic() (for the forced but failed case), or return an error. 1743 * 1744 * If it was possible to detach the device, ensure that the 1745 * device is deactivated. 1746 */ 1747 if (rv == 0) 1748 dev->dv_flags &= ~DVF_ACTIVE; 1749 else if ((flags & DETACH_FORCE) == 0) 1750 goto out; 1751 else { 1752 panic("config_detach: forced detach of %s failed (%d)", 1753 device_xname(dev), rv); 1754 } 1755 1756 /* 1757 * The device has now been successfully detached. 1758 */ 1759 1760 /* Let userland know */ 1761 devmon_report_device(dev, false); 1762 1763 #ifdef DIAGNOSTIC 1764 /* 1765 * Sanity: If you're successfully detached, you should have no 1766 * children. (Note that because children must be attached 1767 * after parents, we only need to search the latter part of 1768 * the list.) 1769 */ 1770 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1771 d = TAILQ_NEXT(d, dv_list)) { 1772 if (d->dv_parent == dev && d->dv_del_gen == 0) { 1773 printf("config_detach: detached device %s" 1774 " has children %s\n", device_xname(dev), device_xname(d)); 1775 panic("config_detach"); 1776 } 1777 } 1778 #endif 1779 1780 /* notify the parent that the child is gone */ 1781 if (dev->dv_parent) { 1782 device_t p = dev->dv_parent; 1783 if (p->dv_cfattach->ca_childdetached) 1784 (*p->dv_cfattach->ca_childdetached)(p, dev); 1785 } 1786 1787 /* 1788 * Mark cfdata to show that the unit can be reused, if possible. 1789 */ 1790 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1791 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1792 if (STREQ(cf->cf_name, cd->cd_name)) { 1793 if (cf->cf_fstate == FSTATE_FOUND && 1794 cf->cf_unit == dev->dv_unit) 1795 cf->cf_fstate = FSTATE_NOTFOUND; 1796 } 1797 } 1798 } 1799 1800 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1801 aprint_normal_dev(dev, "detached\n"); 1802 1803 out: 1804 config_alldevs_enter(&af); 1805 KASSERT(alldevs_nwrite != 0); 1806 --alldevs_nwrite; 1807 if (rv == 0 && dev->dv_del_gen == 0) { 1808 if (alldevs_nwrite == 0 && alldevs_nread == 0) 1809 config_devunlink(dev, &af.af_garbage); 1810 else { 1811 dev->dv_del_gen = alldevs_gen; 1812 alldevs_garbage = true; 1813 } 1814 } 1815 config_alldevs_exit(&af); 1816 1817 return rv; 1818 } 1819 1820 int 1821 config_detach_children(device_t parent, int flags) 1822 { 1823 device_t dv; 1824 deviter_t di; 1825 int error = 0; 1826 1827 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1828 dv = deviter_next(&di)) { 1829 if (device_parent(dv) != parent) 1830 continue; 1831 if ((error = config_detach(dv, flags)) != 0) 1832 break; 1833 } 1834 deviter_release(&di); 1835 return error; 1836 } 1837 1838 device_t 1839 shutdown_first(struct shutdown_state *s) 1840 { 1841 if (!s->initialized) { 1842 deviter_init(&s->di, DEVITER_F_SHUTDOWN|DEVITER_F_LEAVES_FIRST); 1843 s->initialized = true; 1844 } 1845 return shutdown_next(s); 1846 } 1847 1848 device_t 1849 shutdown_next(struct shutdown_state *s) 1850 { 1851 device_t dv; 1852 1853 while ((dv = deviter_next(&s->di)) != NULL && !device_is_active(dv)) 1854 ; 1855 1856 if (dv == NULL) 1857 s->initialized = false; 1858 1859 return dv; 1860 } 1861 1862 bool 1863 config_detach_all(int how) 1864 { 1865 static struct shutdown_state s; 1866 device_t curdev; 1867 bool progress = false; 1868 1869 if ((how & RB_NOSYNC) != 0) 1870 return false; 1871 1872 for (curdev = shutdown_first(&s); curdev != NULL; 1873 curdev = shutdown_next(&s)) { 1874 aprint_debug(" detaching %s, ", device_xname(curdev)); 1875 if (config_detach(curdev, DETACH_SHUTDOWN) == 0) { 1876 progress = true; 1877 aprint_debug("success."); 1878 } else 1879 aprint_debug("failed."); 1880 } 1881 return progress; 1882 } 1883 1884 static bool 1885 device_is_ancestor_of(device_t ancestor, device_t descendant) 1886 { 1887 device_t dv; 1888 1889 for (dv = descendant; dv != NULL; dv = device_parent(dv)) { 1890 if (device_parent(dv) == ancestor) 1891 return true; 1892 } 1893 return false; 1894 } 1895 1896 int 1897 config_deactivate(device_t dev) 1898 { 1899 deviter_t di; 1900 const struct cfattach *ca; 1901 device_t descendant; 1902 int s, rv = 0, oflags; 1903 1904 for (descendant = deviter_first(&di, DEVITER_F_ROOT_FIRST); 1905 descendant != NULL; 1906 descendant = deviter_next(&di)) { 1907 if (dev != descendant && 1908 !device_is_ancestor_of(dev, descendant)) 1909 continue; 1910 1911 if ((descendant->dv_flags & DVF_ACTIVE) == 0) 1912 continue; 1913 1914 ca = descendant->dv_cfattach; 1915 oflags = descendant->dv_flags; 1916 1917 descendant->dv_flags &= ~DVF_ACTIVE; 1918 if (ca->ca_activate == NULL) 1919 continue; 1920 s = splhigh(); 1921 rv = (*ca->ca_activate)(descendant, DVACT_DEACTIVATE); 1922 splx(s); 1923 if (rv != 0) 1924 descendant->dv_flags = oflags; 1925 } 1926 deviter_release(&di); 1927 return rv; 1928 } 1929 1930 /* 1931 * Defer the configuration of the specified device until all 1932 * of its parent's devices have been attached. 1933 */ 1934 void 1935 config_defer(device_t dev, void (*func)(device_t)) 1936 { 1937 struct deferred_config *dc; 1938 1939 if (dev->dv_parent == NULL) 1940 panic("config_defer: can't defer config of a root device"); 1941 1942 #ifdef DIAGNOSTIC 1943 TAILQ_FOREACH(dc, &deferred_config_queue, dc_queue) { 1944 if (dc->dc_dev == dev) 1945 panic("config_defer: deferred twice"); 1946 } 1947 #endif 1948 1949 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1950 if (dc == NULL) 1951 panic("config_defer: unable to allocate callback"); 1952 1953 dc->dc_dev = dev; 1954 dc->dc_func = func; 1955 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1956 config_pending_incr(dev); 1957 } 1958 1959 /* 1960 * Defer some autoconfiguration for a device until after interrupts 1961 * are enabled. 1962 */ 1963 void 1964 config_interrupts(device_t dev, void (*func)(device_t)) 1965 { 1966 struct deferred_config *dc; 1967 1968 /* 1969 * If interrupts are enabled, callback now. 1970 */ 1971 if (cold == 0) { 1972 (*func)(dev); 1973 return; 1974 } 1975 1976 #ifdef DIAGNOSTIC 1977 TAILQ_FOREACH(dc, &interrupt_config_queue, dc_queue) { 1978 if (dc->dc_dev == dev) 1979 panic("config_interrupts: deferred twice"); 1980 } 1981 #endif 1982 1983 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1984 if (dc == NULL) 1985 panic("config_interrupts: unable to allocate callback"); 1986 1987 dc->dc_dev = dev; 1988 dc->dc_func = func; 1989 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 1990 config_pending_incr(dev); 1991 } 1992 1993 /* 1994 * Defer some autoconfiguration for a device until after root file system 1995 * is mounted (to load firmware etc). 1996 */ 1997 void 1998 config_mountroot(device_t dev, void (*func)(device_t)) 1999 { 2000 struct deferred_config *dc; 2001 2002 /* 2003 * If root file system is mounted, callback now. 2004 */ 2005 if (root_is_mounted) { 2006 (*func)(dev); 2007 return; 2008 } 2009 2010 #ifdef DIAGNOSTIC 2011 TAILQ_FOREACH(dc, &mountroot_config_queue, dc_queue) { 2012 if (dc->dc_dev == dev) 2013 panic("%s: deferred twice", __func__); 2014 } 2015 #endif 2016 2017 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2018 if (dc == NULL) 2019 panic("%s: unable to allocate callback", __func__); 2020 2021 dc->dc_dev = dev; 2022 dc->dc_func = func; 2023 TAILQ_INSERT_TAIL(&mountroot_config_queue, dc, dc_queue); 2024 } 2025 2026 /* 2027 * Process a deferred configuration queue. 2028 */ 2029 static void 2030 config_process_deferred(struct deferred_config_head *queue, 2031 device_t parent) 2032 { 2033 struct deferred_config *dc, *ndc; 2034 2035 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 2036 ndc = TAILQ_NEXT(dc, dc_queue); 2037 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 2038 TAILQ_REMOVE(queue, dc, dc_queue); 2039 (*dc->dc_func)(dc->dc_dev); 2040 config_pending_decr(dc->dc_dev); 2041 kmem_free(dc, sizeof(*dc)); 2042 } 2043 } 2044 } 2045 2046 /* 2047 * Manipulate the config_pending semaphore. 2048 */ 2049 void 2050 config_pending_incr(device_t dev) 2051 { 2052 2053 mutex_enter(&config_misc_lock); 2054 config_pending++; 2055 #ifdef DEBUG_AUTOCONF 2056 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2057 #endif 2058 mutex_exit(&config_misc_lock); 2059 } 2060 2061 void 2062 config_pending_decr(device_t dev) 2063 { 2064 2065 #ifdef DIAGNOSTIC 2066 if (config_pending == 0) 2067 panic("config_pending_decr: config_pending == 0"); 2068 #endif 2069 mutex_enter(&config_misc_lock); 2070 config_pending--; 2071 #ifdef DEBUG_AUTOCONF 2072 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2073 #endif 2074 if (config_pending == 0) 2075 cv_broadcast(&config_misc_cv); 2076 mutex_exit(&config_misc_lock); 2077 } 2078 2079 /* 2080 * Register a "finalization" routine. Finalization routines are 2081 * called iteratively once all real devices have been found during 2082 * autoconfiguration, for as long as any one finalizer has done 2083 * any work. 2084 */ 2085 int 2086 config_finalize_register(device_t dev, int (*fn)(device_t)) 2087 { 2088 struct finalize_hook *f; 2089 2090 /* 2091 * If finalization has already been done, invoke the 2092 * callback function now. 2093 */ 2094 if (config_finalize_done) { 2095 while ((*fn)(dev) != 0) 2096 /* loop */ ; 2097 } 2098 2099 /* Ensure this isn't already on the list. */ 2100 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 2101 if (f->f_func == fn && f->f_dev == dev) 2102 return EEXIST; 2103 } 2104 2105 f = kmem_alloc(sizeof(*f), KM_SLEEP); 2106 f->f_func = fn; 2107 f->f_dev = dev; 2108 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 2109 2110 return 0; 2111 } 2112 2113 void 2114 config_finalize(void) 2115 { 2116 struct finalize_hook *f; 2117 struct pdevinit *pdev; 2118 extern struct pdevinit pdevinit[]; 2119 int errcnt, rv; 2120 2121 /* 2122 * Now that device driver threads have been created, wait for 2123 * them to finish any deferred autoconfiguration. 2124 */ 2125 mutex_enter(&config_misc_lock); 2126 while (config_pending != 0) 2127 cv_wait(&config_misc_cv, &config_misc_lock); 2128 mutex_exit(&config_misc_lock); 2129 2130 KERNEL_LOCK(1, NULL); 2131 2132 /* Attach pseudo-devices. */ 2133 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 2134 (*pdev->pdev_attach)(pdev->pdev_count); 2135 2136 /* Run the hooks until none of them does any work. */ 2137 do { 2138 rv = 0; 2139 TAILQ_FOREACH(f, &config_finalize_list, f_list) 2140 rv |= (*f->f_func)(f->f_dev); 2141 } while (rv != 0); 2142 2143 config_finalize_done = 1; 2144 2145 /* Now free all the hooks. */ 2146 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 2147 TAILQ_REMOVE(&config_finalize_list, f, f_list); 2148 kmem_free(f, sizeof(*f)); 2149 } 2150 2151 KERNEL_UNLOCK_ONE(NULL); 2152 2153 errcnt = aprint_get_error_count(); 2154 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 2155 (boothowto & AB_VERBOSE) == 0) { 2156 mutex_enter(&config_misc_lock); 2157 if (config_do_twiddle) { 2158 config_do_twiddle = 0; 2159 printf_nolog(" done.\n"); 2160 } 2161 mutex_exit(&config_misc_lock); 2162 if (errcnt != 0) { 2163 printf("WARNING: %d error%s while detecting hardware; " 2164 "check system log.\n", errcnt, 2165 errcnt == 1 ? "" : "s"); 2166 } 2167 } 2168 } 2169 2170 void 2171 config_twiddle_init(void) 2172 { 2173 2174 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 2175 config_do_twiddle = 1; 2176 } 2177 callout_setfunc(&config_twiddle_ch, config_twiddle_fn, NULL); 2178 } 2179 2180 void 2181 config_twiddle_fn(void *cookie) 2182 { 2183 2184 mutex_enter(&config_misc_lock); 2185 if (config_do_twiddle) { 2186 twiddle(); 2187 callout_schedule(&config_twiddle_ch, mstohz(100)); 2188 } 2189 mutex_exit(&config_misc_lock); 2190 } 2191 2192 static int 2193 config_alldevs_lock(void) 2194 { 2195 mutex_enter(&alldevs_mtx); 2196 return 0; 2197 } 2198 2199 static void 2200 config_alldevs_enter(struct alldevs_foray *af) 2201 { 2202 TAILQ_INIT(&af->af_garbage); 2203 af->af_s = config_alldevs_lock(); 2204 config_collect_garbage(&af->af_garbage); 2205 } 2206 2207 static void 2208 config_alldevs_exit(struct alldevs_foray *af) 2209 { 2210 config_alldevs_unlock(af->af_s); 2211 config_dump_garbage(&af->af_garbage); 2212 } 2213 2214 /*ARGSUSED*/ 2215 static void 2216 config_alldevs_unlock(int s) 2217 { 2218 mutex_exit(&alldevs_mtx); 2219 } 2220 2221 /* 2222 * device_lookup: 2223 * 2224 * Look up a device instance for a given driver. 2225 */ 2226 device_t 2227 device_lookup(cfdriver_t cd, int unit) 2228 { 2229 device_t dv; 2230 int s; 2231 2232 s = config_alldevs_lock(); 2233 KASSERT(mutex_owned(&alldevs_mtx)); 2234 if (unit < 0 || unit >= cd->cd_ndevs) 2235 dv = NULL; 2236 else if ((dv = cd->cd_devs[unit]) != NULL && dv->dv_del_gen != 0) 2237 dv = NULL; 2238 config_alldevs_unlock(s); 2239 2240 return dv; 2241 } 2242 2243 /* 2244 * device_lookup_private: 2245 * 2246 * Look up a softc instance for a given driver. 2247 */ 2248 void * 2249 device_lookup_private(cfdriver_t cd, int unit) 2250 { 2251 2252 return device_private(device_lookup(cd, unit)); 2253 } 2254 2255 /* 2256 * device_find_by_xname: 2257 * 2258 * Returns the device of the given name or NULL if it doesn't exist. 2259 */ 2260 device_t 2261 device_find_by_xname(const char *name) 2262 { 2263 device_t dv; 2264 deviter_t di; 2265 2266 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 2267 if (strcmp(device_xname(dv), name) == 0) 2268 break; 2269 } 2270 deviter_release(&di); 2271 2272 return dv; 2273 } 2274 2275 /* 2276 * device_find_by_driver_unit: 2277 * 2278 * Returns the device of the given driver name and unit or 2279 * NULL if it doesn't exist. 2280 */ 2281 device_t 2282 device_find_by_driver_unit(const char *name, int unit) 2283 { 2284 struct cfdriver *cd; 2285 2286 if ((cd = config_cfdriver_lookup(name)) == NULL) 2287 return NULL; 2288 return device_lookup(cd, unit); 2289 } 2290 2291 /* 2292 * Power management related functions. 2293 */ 2294 2295 bool 2296 device_pmf_is_registered(device_t dev) 2297 { 2298 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 2299 } 2300 2301 bool 2302 device_pmf_driver_suspend(device_t dev, const pmf_qual_t *qual) 2303 { 2304 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2305 return true; 2306 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2307 return false; 2308 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2309 dev->dv_driver_suspend != NULL && 2310 !(*dev->dv_driver_suspend)(dev, qual)) 2311 return false; 2312 2313 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 2314 return true; 2315 } 2316 2317 bool 2318 device_pmf_driver_resume(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_BUS_SUSPENDED) != 0) 2323 return false; 2324 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2325 dev->dv_driver_resume != NULL && 2326 !(*dev->dv_driver_resume)(dev, qual)) 2327 return false; 2328 2329 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2330 return true; 2331 } 2332 2333 bool 2334 device_pmf_driver_shutdown(device_t dev, int how) 2335 { 2336 2337 if (*dev->dv_driver_shutdown != NULL && 2338 !(*dev->dv_driver_shutdown)(dev, how)) 2339 return false; 2340 return true; 2341 } 2342 2343 bool 2344 device_pmf_driver_register(device_t dev, 2345 bool (*suspend)(device_t, const pmf_qual_t *), 2346 bool (*resume)(device_t, const pmf_qual_t *), 2347 bool (*shutdown)(device_t, int)) 2348 { 2349 dev->dv_driver_suspend = suspend; 2350 dev->dv_driver_resume = resume; 2351 dev->dv_driver_shutdown = shutdown; 2352 dev->dv_flags |= DVF_POWER_HANDLERS; 2353 return true; 2354 } 2355 2356 static const char * 2357 curlwp_name(void) 2358 { 2359 if (curlwp->l_name != NULL) 2360 return curlwp->l_name; 2361 else 2362 return curlwp->l_proc->p_comm; 2363 } 2364 2365 void 2366 device_pmf_driver_deregister(device_t dev) 2367 { 2368 device_lock_t dvl = device_getlock(dev); 2369 2370 dev->dv_driver_suspend = NULL; 2371 dev->dv_driver_resume = NULL; 2372 2373 mutex_enter(&dvl->dvl_mtx); 2374 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2375 while (dvl->dvl_nlock > 0 || dvl->dvl_nwait > 0) { 2376 /* Wake a thread that waits for the lock. That 2377 * thread will fail to acquire the lock, and then 2378 * it will wake the next thread that waits for the 2379 * lock, or else it will wake us. 2380 */ 2381 cv_signal(&dvl->dvl_cv); 2382 pmflock_debug(dev, __func__, __LINE__); 2383 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2384 pmflock_debug(dev, __func__, __LINE__); 2385 } 2386 mutex_exit(&dvl->dvl_mtx); 2387 } 2388 2389 bool 2390 device_pmf_driver_child_register(device_t dev) 2391 { 2392 device_t parent = device_parent(dev); 2393 2394 if (parent == NULL || parent->dv_driver_child_register == NULL) 2395 return true; 2396 return (*parent->dv_driver_child_register)(dev); 2397 } 2398 2399 void 2400 device_pmf_driver_set_child_register(device_t dev, 2401 bool (*child_register)(device_t)) 2402 { 2403 dev->dv_driver_child_register = child_register; 2404 } 2405 2406 static void 2407 pmflock_debug(device_t dev, const char *func, int line) 2408 { 2409 device_lock_t dvl = device_getlock(dev); 2410 2411 aprint_debug_dev(dev, "%s.%d, %s dvl_nlock %d dvl_nwait %d dv_flags %x\n", 2412 func, line, curlwp_name(), dvl->dvl_nlock, dvl->dvl_nwait, 2413 dev->dv_flags); 2414 } 2415 2416 static bool 2417 device_pmf_lock1(device_t dev) 2418 { 2419 device_lock_t dvl = device_getlock(dev); 2420 2421 while (device_pmf_is_registered(dev) && 2422 dvl->dvl_nlock > 0 && dvl->dvl_holder != curlwp) { 2423 dvl->dvl_nwait++; 2424 pmflock_debug(dev, __func__, __LINE__); 2425 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2426 pmflock_debug(dev, __func__, __LINE__); 2427 dvl->dvl_nwait--; 2428 } 2429 if (!device_pmf_is_registered(dev)) { 2430 pmflock_debug(dev, __func__, __LINE__); 2431 /* We could not acquire the lock, but some other thread may 2432 * wait for it, also. Wake that thread. 2433 */ 2434 cv_signal(&dvl->dvl_cv); 2435 return false; 2436 } 2437 dvl->dvl_nlock++; 2438 dvl->dvl_holder = curlwp; 2439 pmflock_debug(dev, __func__, __LINE__); 2440 return true; 2441 } 2442 2443 bool 2444 device_pmf_lock(device_t dev) 2445 { 2446 bool rc; 2447 device_lock_t dvl = device_getlock(dev); 2448 2449 mutex_enter(&dvl->dvl_mtx); 2450 rc = device_pmf_lock1(dev); 2451 mutex_exit(&dvl->dvl_mtx); 2452 2453 return rc; 2454 } 2455 2456 void 2457 device_pmf_unlock(device_t dev) 2458 { 2459 device_lock_t dvl = device_getlock(dev); 2460 2461 KASSERT(dvl->dvl_nlock > 0); 2462 mutex_enter(&dvl->dvl_mtx); 2463 if (--dvl->dvl_nlock == 0) 2464 dvl->dvl_holder = NULL; 2465 cv_signal(&dvl->dvl_cv); 2466 pmflock_debug(dev, __func__, __LINE__); 2467 mutex_exit(&dvl->dvl_mtx); 2468 } 2469 2470 device_lock_t 2471 device_getlock(device_t dev) 2472 { 2473 return &dev->dv_lock; 2474 } 2475 2476 void * 2477 device_pmf_bus_private(device_t dev) 2478 { 2479 return dev->dv_bus_private; 2480 } 2481 2482 bool 2483 device_pmf_bus_suspend(device_t dev, const pmf_qual_t *qual) 2484 { 2485 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2486 return true; 2487 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2488 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2489 return false; 2490 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2491 dev->dv_bus_suspend != NULL && 2492 !(*dev->dv_bus_suspend)(dev, qual)) 2493 return false; 2494 2495 dev->dv_flags |= DVF_BUS_SUSPENDED; 2496 return true; 2497 } 2498 2499 bool 2500 device_pmf_bus_resume(device_t dev, const pmf_qual_t *qual) 2501 { 2502 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2503 return true; 2504 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2505 dev->dv_bus_resume != NULL && 2506 !(*dev->dv_bus_resume)(dev, qual)) 2507 return false; 2508 2509 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2510 return true; 2511 } 2512 2513 bool 2514 device_pmf_bus_shutdown(device_t dev, int how) 2515 { 2516 2517 if (*dev->dv_bus_shutdown != NULL && 2518 !(*dev->dv_bus_shutdown)(dev, how)) 2519 return false; 2520 return true; 2521 } 2522 2523 void 2524 device_pmf_bus_register(device_t dev, void *priv, 2525 bool (*suspend)(device_t, const pmf_qual_t *), 2526 bool (*resume)(device_t, const pmf_qual_t *), 2527 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2528 { 2529 dev->dv_bus_private = priv; 2530 dev->dv_bus_resume = resume; 2531 dev->dv_bus_suspend = suspend; 2532 dev->dv_bus_shutdown = shutdown; 2533 dev->dv_bus_deregister = deregister; 2534 } 2535 2536 void 2537 device_pmf_bus_deregister(device_t dev) 2538 { 2539 if (dev->dv_bus_deregister == NULL) 2540 return; 2541 (*dev->dv_bus_deregister)(dev); 2542 dev->dv_bus_private = NULL; 2543 dev->dv_bus_suspend = NULL; 2544 dev->dv_bus_resume = NULL; 2545 dev->dv_bus_deregister = NULL; 2546 } 2547 2548 void * 2549 device_pmf_class_private(device_t dev) 2550 { 2551 return dev->dv_class_private; 2552 } 2553 2554 bool 2555 device_pmf_class_suspend(device_t dev, const pmf_qual_t *qual) 2556 { 2557 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2558 return true; 2559 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2560 dev->dv_class_suspend != NULL && 2561 !(*dev->dv_class_suspend)(dev, qual)) 2562 return false; 2563 2564 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2565 return true; 2566 } 2567 2568 bool 2569 device_pmf_class_resume(device_t dev, const pmf_qual_t *qual) 2570 { 2571 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2572 return true; 2573 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2574 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2575 return false; 2576 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2577 dev->dv_class_resume != NULL && 2578 !(*dev->dv_class_resume)(dev, qual)) 2579 return false; 2580 2581 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2582 return true; 2583 } 2584 2585 void 2586 device_pmf_class_register(device_t dev, void *priv, 2587 bool (*suspend)(device_t, const pmf_qual_t *), 2588 bool (*resume)(device_t, const pmf_qual_t *), 2589 void (*deregister)(device_t)) 2590 { 2591 dev->dv_class_private = priv; 2592 dev->dv_class_suspend = suspend; 2593 dev->dv_class_resume = resume; 2594 dev->dv_class_deregister = deregister; 2595 } 2596 2597 void 2598 device_pmf_class_deregister(device_t dev) 2599 { 2600 if (dev->dv_class_deregister == NULL) 2601 return; 2602 (*dev->dv_class_deregister)(dev); 2603 dev->dv_class_private = NULL; 2604 dev->dv_class_suspend = NULL; 2605 dev->dv_class_resume = NULL; 2606 dev->dv_class_deregister = NULL; 2607 } 2608 2609 bool 2610 device_active(device_t dev, devactive_t type) 2611 { 2612 size_t i; 2613 2614 if (dev->dv_activity_count == 0) 2615 return false; 2616 2617 for (i = 0; i < dev->dv_activity_count; ++i) { 2618 if (dev->dv_activity_handlers[i] == NULL) 2619 break; 2620 (*dev->dv_activity_handlers[i])(dev, type); 2621 } 2622 2623 return true; 2624 } 2625 2626 bool 2627 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2628 { 2629 void (**new_handlers)(device_t, devactive_t); 2630 void (**old_handlers)(device_t, devactive_t); 2631 size_t i, old_size, new_size; 2632 int s; 2633 2634 old_handlers = dev->dv_activity_handlers; 2635 old_size = dev->dv_activity_count; 2636 2637 for (i = 0; i < old_size; ++i) { 2638 KASSERT(old_handlers[i] != handler); 2639 if (old_handlers[i] == NULL) { 2640 old_handlers[i] = handler; 2641 return true; 2642 } 2643 } 2644 2645 new_size = old_size + 4; 2646 new_handlers = kmem_alloc(sizeof(void *[new_size]), KM_SLEEP); 2647 2648 memcpy(new_handlers, old_handlers, sizeof(void *[old_size])); 2649 new_handlers[old_size] = handler; 2650 memset(new_handlers + old_size + 1, 0, 2651 sizeof(int [new_size - (old_size+1)])); 2652 2653 s = splhigh(); 2654 dev->dv_activity_count = new_size; 2655 dev->dv_activity_handlers = new_handlers; 2656 splx(s); 2657 2658 if (old_handlers != NULL) 2659 kmem_free(old_handlers, sizeof(void * [old_size])); 2660 2661 return true; 2662 } 2663 2664 void 2665 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2666 { 2667 void (**old_handlers)(device_t, devactive_t); 2668 size_t i, old_size; 2669 int s; 2670 2671 old_handlers = dev->dv_activity_handlers; 2672 old_size = dev->dv_activity_count; 2673 2674 for (i = 0; i < old_size; ++i) { 2675 if (old_handlers[i] == handler) 2676 break; 2677 if (old_handlers[i] == NULL) 2678 return; /* XXX panic? */ 2679 } 2680 2681 if (i == old_size) 2682 return; /* XXX panic? */ 2683 2684 for (; i < old_size - 1; ++i) { 2685 if ((old_handlers[i] = old_handlers[i + 1]) != NULL) 2686 continue; 2687 2688 if (i == 0) { 2689 s = splhigh(); 2690 dev->dv_activity_count = 0; 2691 dev->dv_activity_handlers = NULL; 2692 splx(s); 2693 kmem_free(old_handlers, sizeof(void *[old_size])); 2694 } 2695 return; 2696 } 2697 old_handlers[i] = NULL; 2698 } 2699 2700 /* Return true iff the device_t `dev' exists at generation `gen'. */ 2701 static bool 2702 device_exists_at(device_t dv, devgen_t gen) 2703 { 2704 return (dv->dv_del_gen == 0 || dv->dv_del_gen > gen) && 2705 dv->dv_add_gen <= gen; 2706 } 2707 2708 static bool 2709 deviter_visits(const deviter_t *di, device_t dv) 2710 { 2711 return device_exists_at(dv, di->di_gen); 2712 } 2713 2714 /* 2715 * Device Iteration 2716 * 2717 * deviter_t: a device iterator. Holds state for a "walk" visiting 2718 * each device_t's in the device tree. 2719 * 2720 * deviter_init(di, flags): initialize the device iterator `di' 2721 * to "walk" the device tree. deviter_next(di) will return 2722 * the first device_t in the device tree, or NULL if there are 2723 * no devices. 2724 * 2725 * `flags' is one or more of DEVITER_F_RW, indicating that the 2726 * caller intends to modify the device tree by calling 2727 * config_detach(9) on devices in the order that the iterator 2728 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2729 * nearest the "root" of the device tree to be returned, first; 2730 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2731 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2732 * indicating both that deviter_init() should not respect any 2733 * locks on the device tree, and that deviter_next(di) may run 2734 * in more than one LWP before the walk has finished. 2735 * 2736 * Only one DEVITER_F_RW iterator may be in the device tree at 2737 * once. 2738 * 2739 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2740 * 2741 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2742 * DEVITER_F_LEAVES_FIRST are used in combination. 2743 * 2744 * deviter_first(di, flags): initialize the device iterator `di' 2745 * and return the first device_t in the device tree, or NULL 2746 * if there are no devices. The statement 2747 * 2748 * dv = deviter_first(di); 2749 * 2750 * is shorthand for 2751 * 2752 * deviter_init(di); 2753 * dv = deviter_next(di); 2754 * 2755 * deviter_next(di): return the next device_t in the device tree, 2756 * or NULL if there are no more devices. deviter_next(di) 2757 * is undefined if `di' was not initialized with deviter_init() or 2758 * deviter_first(). 2759 * 2760 * deviter_release(di): stops iteration (subsequent calls to 2761 * deviter_next() will return NULL), releases any locks and 2762 * resources held by the device iterator. 2763 * 2764 * Device iteration does not return device_t's in any particular 2765 * order. An iterator will never return the same device_t twice. 2766 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2767 * is called repeatedly on the same `di', it will eventually return 2768 * NULL. It is ok to attach/detach devices during device iteration. 2769 */ 2770 void 2771 deviter_init(deviter_t *di, deviter_flags_t flags) 2772 { 2773 device_t dv; 2774 int s; 2775 2776 memset(di, 0, sizeof(*di)); 2777 2778 s = config_alldevs_lock(); 2779 if ((flags & DEVITER_F_SHUTDOWN) != 0) 2780 flags |= DEVITER_F_RW; 2781 2782 if ((flags & DEVITER_F_RW) != 0) 2783 alldevs_nwrite++; 2784 else 2785 alldevs_nread++; 2786 di->di_gen = alldevs_gen++; 2787 config_alldevs_unlock(s); 2788 2789 di->di_flags = flags; 2790 2791 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2792 case DEVITER_F_LEAVES_FIRST: 2793 TAILQ_FOREACH(dv, &alldevs, dv_list) { 2794 if (!deviter_visits(di, dv)) 2795 continue; 2796 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2797 } 2798 break; 2799 case DEVITER_F_ROOT_FIRST: 2800 TAILQ_FOREACH(dv, &alldevs, dv_list) { 2801 if (!deviter_visits(di, dv)) 2802 continue; 2803 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2804 } 2805 break; 2806 default: 2807 break; 2808 } 2809 2810 deviter_reinit(di); 2811 } 2812 2813 static void 2814 deviter_reinit(deviter_t *di) 2815 { 2816 if ((di->di_flags & DEVITER_F_RW) != 0) 2817 di->di_prev = TAILQ_LAST(&alldevs, devicelist); 2818 else 2819 di->di_prev = TAILQ_FIRST(&alldevs); 2820 } 2821 2822 device_t 2823 deviter_first(deviter_t *di, deviter_flags_t flags) 2824 { 2825 deviter_init(di, flags); 2826 return deviter_next(di); 2827 } 2828 2829 static device_t 2830 deviter_next2(deviter_t *di) 2831 { 2832 device_t dv; 2833 2834 dv = di->di_prev; 2835 2836 if (dv == NULL) 2837 return NULL; 2838 2839 if ((di->di_flags & DEVITER_F_RW) != 0) 2840 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2841 else 2842 di->di_prev = TAILQ_NEXT(dv, dv_list); 2843 2844 return dv; 2845 } 2846 2847 static device_t 2848 deviter_next1(deviter_t *di) 2849 { 2850 device_t dv; 2851 2852 do { 2853 dv = deviter_next2(di); 2854 } while (dv != NULL && !deviter_visits(di, dv)); 2855 2856 return dv; 2857 } 2858 2859 device_t 2860 deviter_next(deviter_t *di) 2861 { 2862 device_t dv = NULL; 2863 2864 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2865 case 0: 2866 return deviter_next1(di); 2867 case DEVITER_F_LEAVES_FIRST: 2868 while (di->di_curdepth >= 0) { 2869 if ((dv = deviter_next1(di)) == NULL) { 2870 di->di_curdepth--; 2871 deviter_reinit(di); 2872 } else if (dv->dv_depth == di->di_curdepth) 2873 break; 2874 } 2875 return dv; 2876 case DEVITER_F_ROOT_FIRST: 2877 while (di->di_curdepth <= di->di_maxdepth) { 2878 if ((dv = deviter_next1(di)) == NULL) { 2879 di->di_curdepth++; 2880 deviter_reinit(di); 2881 } else if (dv->dv_depth == di->di_curdepth) 2882 break; 2883 } 2884 return dv; 2885 default: 2886 return NULL; 2887 } 2888 } 2889 2890 void 2891 deviter_release(deviter_t *di) 2892 { 2893 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 2894 int s; 2895 2896 s = config_alldevs_lock(); 2897 if (rw) 2898 --alldevs_nwrite; 2899 else 2900 --alldevs_nread; 2901 /* XXX wake a garbage-collection thread */ 2902 config_alldevs_unlock(s); 2903 } 2904 2905 const char * 2906 cfdata_ifattr(const struct cfdata *cf) 2907 { 2908 return cf->cf_pspec->cfp_iattr; 2909 } 2910 2911 bool 2912 ifattr_match(const char *snull, const char *t) 2913 { 2914 return (snull == NULL) || strcmp(snull, t) == 0; 2915 } 2916 2917 void 2918 null_childdetached(device_t self, device_t child) 2919 { 2920 /* do nothing */ 2921 } 2922 2923 static void 2924 sysctl_detach_setup(struct sysctllog **clog) 2925 { 2926 2927 sysctl_createv(clog, 0, NULL, NULL, 2928 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 2929 CTLTYPE_BOOL, "detachall", 2930 SYSCTL_DESCR("Detach all devices at shutdown"), 2931 NULL, 0, &detachall, 0, 2932 CTL_KERN, CTL_CREATE, CTL_EOL); 2933 } 2934
Indexes created Fri Sep 26 20:09:58 GMT 2025