subr_autoconf.c revision 1.252.4.2
1 /* $NetBSD: subr_autoconf.c,v 1.252.4.2 2017/04/28 06:00:33 pgoyette 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 1.252.4.2 2017/04/28 06:00:33 pgoyette 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 #include <sys/localcount.h> 111 112 #include <sys/disk.h> 113 114 #include <sys/rndsource.h> 115 116 #include <machine/limits.h> 117 118 /* 119 * Autoconfiguration subroutines. 120 */ 121 122 /* 123 * Device autoconfiguration timings are mixed into the entropy pool. 124 */ 125 extern krndsource_t rnd_autoconf_source; 126 127 /* 128 * ioconf.c exports exactly two names: cfdata and cfroots. All system 129 * devices and drivers are found via these tables. 130 */ 131 extern struct cfdata cfdata[]; 132 extern const short cfroots[]; 133 134 /* 135 * List of all cfdriver structures. We use this to detect duplicates 136 * when other cfdrivers are loaded. 137 */ 138 struct cfdriverlist allcfdrivers = LIST_HEAD_INITIALIZER(&allcfdrivers); 139 extern struct cfdriver * const cfdriver_list_initial[]; 140 141 /* 142 * Initial list of cfattach's. 143 */ 144 extern const struct cfattachinit cfattachinit[]; 145 146 /* 147 * List of cfdata tables. We always have one such list -- the one 148 * built statically when the kernel was configured. 149 */ 150 struct cftablelist allcftables = TAILQ_HEAD_INITIALIZER(allcftables); 151 static struct cftable initcftable; 152 153 #define ROOT ((device_t)NULL) 154 155 struct matchinfo { 156 cfsubmatch_t fn; 157 device_t parent; 158 const int *locs; 159 void *aux; 160 struct cfdata *match; 161 int pri; 162 }; 163 164 struct alldevs_foray { 165 int af_s; 166 struct devicelist af_garbage; 167 }; 168 169 static char *number(char *, int); 170 static void mapply(struct matchinfo *, cfdata_t); 171 static device_t config_devalloc(const device_t, const cfdata_t, const int *); 172 static void config_devdelete(device_t); 173 static void config_devunlink(device_t, struct devicelist *); 174 static void config_makeroom(int, struct cfdriver *); 175 static void config_devlink(device_t); 176 static void config_alldevs_enter(struct alldevs_foray *); 177 static void config_alldevs_exit(struct alldevs_foray *); 178 static void config_add_attrib_dict(device_t); 179 180 static void config_collect_garbage(struct devicelist *); 181 static void config_dump_garbage(struct devicelist *); 182 183 static void pmflock_debug(device_t, const char *, int); 184 185 static device_t deviter_next1(deviter_t *); 186 static void deviter_reinit(deviter_t *); 187 188 struct deferred_config { 189 TAILQ_ENTRY(deferred_config) dc_queue; 190 device_t dc_dev; 191 void (*dc_func)(device_t); 192 }; 193 194 TAILQ_HEAD(deferred_config_head, deferred_config); 195 196 struct deferred_config_head deferred_config_queue = 197 TAILQ_HEAD_INITIALIZER(deferred_config_queue); 198 struct deferred_config_head interrupt_config_queue = 199 TAILQ_HEAD_INITIALIZER(interrupt_config_queue); 200 int interrupt_config_threads = 8; 201 struct deferred_config_head mountroot_config_queue = 202 TAILQ_HEAD_INITIALIZER(mountroot_config_queue); 203 int mountroot_config_threads = 2; 204 static lwp_t **mountroot_config_lwpids; 205 static size_t mountroot_config_lwpids_size; 206 static bool root_is_mounted = false; 207 208 static void config_process_deferred(struct deferred_config_head *, device_t); 209 210 /* Hooks to finalize configuration once all real devices have been found. */ 211 struct finalize_hook { 212 TAILQ_ENTRY(finalize_hook) f_list; 213 int (*f_func)(device_t); 214 device_t f_dev; 215 }; 216 static TAILQ_HEAD(, finalize_hook) config_finalize_list = 217 TAILQ_HEAD_INITIALIZER(config_finalize_list); 218 static int config_finalize_done; 219 220 /* list of all devices */ 221 static struct { 222 kmutex_t lock; 223 struct devicelist list; 224 devgen_t gen; 225 int nread; 226 int nwrite; 227 bool garbage; 228 } alldevs __cacheline_aligned = { 229 .list = TAILQ_HEAD_INITIALIZER(alldevs.list), 230 .gen = 1, 231 .nread = 0, 232 .nwrite = 0, 233 .garbage = false, 234 }; 235 236 static int config_pending; /* semaphore for mountroot */ 237 static kmutex_t config_misc_lock; 238 static kcondvar_t config_misc_cv; 239 static kcondvar_t config_drain_cv; 240 241 static bool detachall = false; 242 243 #define STREQ(s1, s2) \ 244 (*(s1) == *(s2) && strcmp((s1), (s2)) == 0) 245 246 static bool config_initialized = false; /* config_init() has been called. */ 247 248 static int config_do_twiddle; 249 static callout_t config_twiddle_ch; 250 251 static void sysctl_detach_setup(struct sysctllog **); 252 253 int no_devmon_insert(const char *, prop_dictionary_t); 254 int (*devmon_insert_vec)(const char *, prop_dictionary_t) = no_devmon_insert; 255 256 typedef int (*cfdriver_fn)(struct cfdriver *); 257 static int 258 frob_cfdrivervec(struct cfdriver * const *cfdriverv, 259 cfdriver_fn drv_do, cfdriver_fn drv_undo, 260 const char *style, bool dopanic) 261 { 262 void (*pr)(const char *, ...) __printflike(1, 2) = 263 dopanic ? panic : printf; 264 int i, error = 0, e2 __diagused; 265 266 for (i = 0; cfdriverv[i] != NULL; i++) { 267 if ((error = drv_do(cfdriverv[i])) != 0) { 268 pr("configure: `%s' driver %s failed: %d", 269 cfdriverv[i]->cd_name, style, error); 270 goto bad; 271 } 272 } 273 274 KASSERT(error == 0); 275 return 0; 276 277 bad: 278 printf("\n"); 279 for (i--; i >= 0; i--) { 280 e2 = drv_undo(cfdriverv[i]); 281 KASSERT(e2 == 0); 282 } 283 284 return error; 285 } 286 287 typedef int (*cfattach_fn)(const char *, struct cfattach *); 288 static int 289 frob_cfattachvec(const struct cfattachinit *cfattachv, 290 cfattach_fn att_do, cfattach_fn att_undo, 291 const char *style, bool dopanic) 292 { 293 const struct cfattachinit *cfai = NULL; 294 void (*pr)(const char *, ...) __printflike(1, 2) = 295 dopanic ? panic : printf; 296 int j = 0, error = 0, e2 __diagused; 297 298 for (cfai = &cfattachv[0]; cfai->cfai_name != NULL; cfai++) { 299 for (j = 0; cfai->cfai_list[j] != NULL; j++) { 300 if ((error = att_do(cfai->cfai_name, 301 cfai->cfai_list[j])) != 0) { 302 pr("configure: attachment `%s' " 303 "of `%s' driver %s failed: %d", 304 cfai->cfai_list[j]->ca_name, 305 cfai->cfai_name, style, error); 306 goto bad; 307 } 308 } 309 } 310 311 KASSERT(error == 0); 312 return 0; 313 314 bad: 315 /* 316 * Rollback in reverse order. dunno if super-important, but 317 * do that anyway. Although the code looks a little like 318 * someone did a little integration (in the math sense). 319 */ 320 printf("\n"); 321 if (cfai) { 322 bool last; 323 324 for (last = false; last == false; ) { 325 if (cfai == &cfattachv[0]) 326 last = true; 327 for (j--; j >= 0; j--) { 328 e2 = att_undo(cfai->cfai_name, 329 cfai->cfai_list[j]); 330 KASSERT(e2 == 0); 331 } 332 if (!last) { 333 cfai--; 334 for (j = 0; cfai->cfai_list[j] != NULL; j++) 335 ; 336 } 337 } 338 } 339 340 return error; 341 } 342 343 /* 344 * Initialize the autoconfiguration data structures. Normally this 345 * is done by configure(), but some platforms need to do this very 346 * early (to e.g. initialize the console). 347 */ 348 void 349 config_init(void) 350 { 351 352 KASSERT(config_initialized == false); 353 354 mutex_init(&alldevs.lock, MUTEX_DEFAULT, IPL_VM); 355 356 mutex_init(&config_misc_lock, MUTEX_DEFAULT, IPL_NONE); 357 cv_init(&config_misc_cv, "cfgmisc"); 358 cv_init(&config_drain_cv, "cfgdrain"); 359 360 callout_init(&config_twiddle_ch, CALLOUT_MPSAFE); 361 362 frob_cfdrivervec(cfdriver_list_initial, 363 config_cfdriver_attach, NULL, "bootstrap", true); 364 frob_cfattachvec(cfattachinit, 365 config_cfattach_attach, NULL, "bootstrap", true); 366 367 initcftable.ct_cfdata = cfdata; 368 TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list); 369 370 config_initialized = true; 371 } 372 373 /* 374 * Init or fini drivers and attachments. Either all or none 375 * are processed (via rollback). It would be nice if this were 376 * atomic to outside consumers, but with the current state of 377 * locking ... 378 */ 379 int 380 config_init_component(struct cfdriver * const *cfdriverv, 381 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 382 { 383 int error; 384 385 if ((error = frob_cfdrivervec(cfdriverv, 386 config_cfdriver_attach, config_cfdriver_detach, "init", false))!= 0) 387 return error; 388 if ((error = frob_cfattachvec(cfattachv, 389 config_cfattach_attach, config_cfattach_detach, 390 "init", false)) != 0) { 391 frob_cfdrivervec(cfdriverv, 392 config_cfdriver_detach, NULL, "init rollback", true); 393 return error; 394 } 395 if ((error = config_cfdata_attach(cfdatav, 1)) != 0) { 396 frob_cfattachvec(cfattachv, 397 config_cfattach_detach, NULL, "init rollback", true); 398 frob_cfdrivervec(cfdriverv, 399 config_cfdriver_detach, NULL, "init rollback", true); 400 return error; 401 } 402 403 return 0; 404 } 405 406 int 407 config_fini_component(struct cfdriver * const *cfdriverv, 408 const struct cfattachinit *cfattachv, struct cfdata *cfdatav) 409 { 410 int error; 411 412 if ((error = config_cfdata_detach(cfdatav)) != 0) 413 return error; 414 if ((error = frob_cfattachvec(cfattachv, 415 config_cfattach_detach, config_cfattach_attach, 416 "fini", false)) != 0) { 417 if (config_cfdata_attach(cfdatav, 0) != 0) 418 panic("config_cfdata fini rollback failed"); 419 return error; 420 } 421 if ((error = frob_cfdrivervec(cfdriverv, 422 config_cfdriver_detach, config_cfdriver_attach, 423 "fini", false)) != 0) { 424 frob_cfattachvec(cfattachv, 425 config_cfattach_attach, NULL, "fini rollback", true); 426 if (config_cfdata_attach(cfdatav, 0) != 0) 427 panic("config_cfdata fini rollback failed"); 428 return error; 429 } 430 431 return 0; 432 } 433 434 void 435 config_init_mi(void) 436 { 437 438 if (!config_initialized) 439 config_init(); 440 441 sysctl_detach_setup(NULL); 442 } 443 444 void 445 config_deferred(device_t dev) 446 { 447 config_process_deferred(&deferred_config_queue, dev); 448 config_process_deferred(&interrupt_config_queue, dev); 449 config_process_deferred(&mountroot_config_queue, dev); 450 } 451 452 static void 453 config_interrupts_thread(void *cookie) 454 { 455 struct deferred_config *dc; 456 457 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 458 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 459 (*dc->dc_func)(dc->dc_dev); 460 config_pending_decr(dc->dc_dev); 461 kmem_free(dc, sizeof(*dc)); 462 } 463 kthread_exit(0); 464 } 465 466 void 467 config_create_interruptthreads(void) 468 { 469 int i; 470 471 for (i = 0; i < interrupt_config_threads; i++) { 472 (void)kthread_create(PRI_NONE, 0, NULL, 473 config_interrupts_thread, NULL, NULL, "configintr"); 474 } 475 } 476 477 static void 478 config_mountroot_thread(void *cookie) 479 { 480 struct deferred_config *dc; 481 482 while ((dc = TAILQ_FIRST(&mountroot_config_queue)) != NULL) { 483 TAILQ_REMOVE(&mountroot_config_queue, dc, dc_queue); 484 (*dc->dc_func)(dc->dc_dev); 485 kmem_free(dc, sizeof(*dc)); 486 } 487 kthread_exit(0); 488 } 489 490 void 491 config_create_mountrootthreads(void) 492 { 493 int i; 494 495 if (!root_is_mounted) 496 root_is_mounted = true; 497 498 mountroot_config_lwpids_size = sizeof(mountroot_config_lwpids) * 499 mountroot_config_threads; 500 mountroot_config_lwpids = kmem_alloc(mountroot_config_lwpids_size, 501 KM_NOSLEEP); 502 KASSERT(mountroot_config_lwpids); 503 for (i = 0; i < mountroot_config_threads; i++) { 504 mountroot_config_lwpids[i] = 0; 505 (void)kthread_create(PRI_NONE, KTHREAD_MUSTJOIN, NULL, 506 config_mountroot_thread, NULL, 507 &mountroot_config_lwpids[i], 508 "configroot"); 509 } 510 } 511 512 void 513 config_finalize_mountroot(void) 514 { 515 int i, error; 516 517 for (i = 0; i < mountroot_config_threads; i++) { 518 if (mountroot_config_lwpids[i] == 0) 519 continue; 520 521 error = kthread_join(mountroot_config_lwpids[i]); 522 if (error) 523 printf("%s: thread %x joined with error %d\n", 524 __func__, i, error); 525 } 526 kmem_free(mountroot_config_lwpids, mountroot_config_lwpids_size); 527 } 528 529 /* 530 * Announce device attach/detach to userland listeners. 531 */ 532 533 int 534 no_devmon_insert(const char *name, prop_dictionary_t p) 535 { 536 537 return ENODEV; 538 } 539 540 static void 541 devmon_report_device(device_t dev, bool isattach) 542 { 543 prop_dictionary_t ev; 544 const char *parent; 545 const char *what; 546 device_t pdev = device_parent(dev); 547 548 /* If currently no drvctl device, just return */ 549 if (devmon_insert_vec == no_devmon_insert) 550 return; 551 552 ev = prop_dictionary_create(); 553 if (ev == NULL) 554 return; 555 556 what = (isattach ? "device-attach" : "device-detach"); 557 parent = (pdev == NULL ? "root" : device_xname(pdev)); 558 if (!prop_dictionary_set_cstring(ev, "device", device_xname(dev)) || 559 !prop_dictionary_set_cstring(ev, "parent", parent)) { 560 prop_object_release(ev); 561 return; 562 } 563 564 if ((*devmon_insert_vec)(what, ev) != 0) 565 prop_object_release(ev); 566 } 567 568 /* 569 * Add a cfdriver to the system. 570 */ 571 int 572 config_cfdriver_attach(struct cfdriver *cd) 573 { 574 struct cfdriver *lcd; 575 576 /* Make sure this driver isn't already in the system. */ 577 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 578 if (STREQ(lcd->cd_name, cd->cd_name)) 579 return EEXIST; 580 } 581 LIST_INIT(&cd->cd_attach); 582 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 583 584 return 0; 585 } 586 587 /* 588 * Remove a cfdriver from the system. 589 */ 590 int 591 config_cfdriver_detach(struct cfdriver *cd) 592 { 593 struct alldevs_foray af; 594 int i, rc = 0; 595 596 config_alldevs_enter(&af); 597 /* Make sure there are no active instances. */ 598 for (i = 0; i < cd->cd_ndevs; i++) { 599 if (cd->cd_devs[i] != NULL) { 600 rc = EBUSY; 601 break; 602 } 603 } 604 config_alldevs_exit(&af); 605 if (rc != 0) 606 return rc; 607 608 /* ...and no attachments loaded. */ 609 if (LIST_EMPTY(&cd->cd_attach) == 0) 610 return EBUSY; 611 612 LIST_REMOVE(cd, cd_list); 613 614 KASSERT(cd->cd_devs == NULL); 615 616 return 0; 617 } 618 619 /* 620 * Look up a cfdriver by name. 621 */ 622 struct cfdriver * 623 config_cfdriver_lookup(const char *name) 624 { 625 struct cfdriver *cd; 626 627 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 628 if (STREQ(cd->cd_name, name)) 629 return cd; 630 } 631 632 return NULL; 633 } 634 635 /* 636 * Add a cfattach to the specified driver. 637 */ 638 int 639 config_cfattach_attach(const char *driver, struct cfattach *ca) 640 { 641 struct cfattach *lca; 642 struct cfdriver *cd; 643 644 cd = config_cfdriver_lookup(driver); 645 if (cd == NULL) 646 return ESRCH; 647 648 /* Make sure this attachment isn't already on this driver. */ 649 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 650 if (STREQ(lca->ca_name, ca->ca_name)) 651 return EEXIST; 652 } 653 654 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 655 656 return 0; 657 } 658 659 /* 660 * Remove a cfattach from the specified driver. 661 */ 662 int 663 config_cfattach_detach(const char *driver, struct cfattach *ca) 664 { 665 struct alldevs_foray af; 666 struct cfdriver *cd; 667 device_t dev; 668 int i, rc = 0; 669 670 cd = config_cfdriver_lookup(driver); 671 if (cd == NULL) 672 return ESRCH; 673 674 config_alldevs_enter(&af); 675 /* Make sure there are no active instances. */ 676 for (i = 0; i < cd->cd_ndevs; i++) { 677 if ((dev = cd->cd_devs[i]) == NULL) 678 continue; 679 if (dev->dv_cfattach == ca) { 680 rc = EBUSY; 681 break; 682 } 683 } 684 config_alldevs_exit(&af); 685 686 if (rc != 0) 687 return rc; 688 689 LIST_REMOVE(ca, ca_list); 690 691 return 0; 692 } 693 694 /* 695 * Look up a cfattach by name. 696 */ 697 static struct cfattach * 698 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 699 { 700 struct cfattach *ca; 701 702 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 703 if (STREQ(ca->ca_name, atname)) 704 return ca; 705 } 706 707 return NULL; 708 } 709 710 /* 711 * Look up a cfattach by driver/attachment name. 712 */ 713 struct cfattach * 714 config_cfattach_lookup(const char *name, const char *atname) 715 { 716 struct cfdriver *cd; 717 718 cd = config_cfdriver_lookup(name); 719 if (cd == NULL) 720 return NULL; 721 722 return config_cfattach_lookup_cd(cd, atname); 723 } 724 725 /* 726 * Apply the matching function and choose the best. This is used 727 * a few times and we want to keep the code small. 728 */ 729 static void 730 mapply(struct matchinfo *m, cfdata_t cf) 731 { 732 int pri; 733 734 if (m->fn != NULL) { 735 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 736 } else { 737 pri = config_match(m->parent, cf, m->aux); 738 } 739 if (pri > m->pri) { 740 m->match = cf; 741 m->pri = pri; 742 } 743 } 744 745 int 746 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 747 { 748 const struct cfiattrdata *ci; 749 const struct cflocdesc *cl; 750 int nlocs, i; 751 752 ci = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 753 KASSERT(ci); 754 nlocs = ci->ci_loclen; 755 KASSERT(!nlocs || locs); 756 for (i = 0; i < nlocs; i++) { 757 cl = &ci->ci_locdesc[i]; 758 if (cl->cld_defaultstr != NULL && 759 cf->cf_loc[i] == cl->cld_default) 760 continue; 761 if (cf->cf_loc[i] == locs[i]) 762 continue; 763 return 0; 764 } 765 766 return config_match(parent, cf, aux); 767 } 768 769 /* 770 * Helper function: check whether the driver supports the interface attribute 771 * and return its descriptor structure. 772 */ 773 static const struct cfiattrdata * 774 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 775 { 776 const struct cfiattrdata * const *cpp; 777 778 if (cd->cd_attrs == NULL) 779 return 0; 780 781 for (cpp = cd->cd_attrs; *cpp; cpp++) { 782 if (STREQ((*cpp)->ci_name, ia)) { 783 /* Match. */ 784 return *cpp; 785 } 786 } 787 return 0; 788 } 789 790 /* 791 * Lookup an interface attribute description by name. 792 * If the driver is given, consider only its supported attributes. 793 */ 794 const struct cfiattrdata * 795 cfiattr_lookup(const char *name, const struct cfdriver *cd) 796 { 797 const struct cfdriver *d; 798 const struct cfiattrdata *ia; 799 800 if (cd) 801 return cfdriver_get_iattr(cd, name); 802 803 LIST_FOREACH(d, &allcfdrivers, cd_list) { 804 ia = cfdriver_get_iattr(d, name); 805 if (ia) 806 return ia; 807 } 808 return 0; 809 } 810 811 /* 812 * Determine if `parent' is a potential parent for a device spec based 813 * on `cfp'. 814 */ 815 static int 816 cfparent_match(const device_t parent, const struct cfparent *cfp) 817 { 818 struct cfdriver *pcd; 819 820 /* We don't match root nodes here. */ 821 if (cfp == NULL) 822 return 0; 823 824 pcd = parent->dv_cfdriver; 825 KASSERT(pcd != NULL); 826 827 /* 828 * First, ensure this parent has the correct interface 829 * attribute. 830 */ 831 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 832 return 0; 833 834 /* 835 * If no specific parent device instance was specified (i.e. 836 * we're attaching to the attribute only), we're done! 837 */ 838 if (cfp->cfp_parent == NULL) 839 return 1; 840 841 /* 842 * Check the parent device's name. 843 */ 844 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 845 return 0; /* not the same parent */ 846 847 /* 848 * Make sure the unit number matches. 849 */ 850 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 851 cfp->cfp_unit == parent->dv_unit) 852 return 1; 853 854 /* Unit numbers don't match. */ 855 return 0; 856 } 857 858 /* 859 * Helper for config_cfdata_attach(): check all devices whether it could be 860 * parent any attachment in the config data table passed, and rescan. 861 */ 862 static void 863 rescan_with_cfdata(const struct cfdata *cf) 864 { 865 device_t d; 866 const struct cfdata *cf1; 867 deviter_t di; 868 869 870 /* 871 * "alldevs" is likely longer than a modules's cfdata, so make it 872 * the outer loop. 873 */ 874 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 875 876 if (!(d->dv_cfattach->ca_rescan)) 877 continue; 878 879 for (cf1 = cf; cf1->cf_name; cf1++) { 880 881 if (!cfparent_match(d, cf1->cf_pspec)) 882 continue; 883 884 (*d->dv_cfattach->ca_rescan)(d, 885 cfdata_ifattr(cf1), cf1->cf_loc); 886 887 config_deferred(d); 888 } 889 } 890 deviter_release(&di); 891 } 892 893 /* 894 * Attach a supplemental config data table and rescan potential 895 * parent devices if required. 896 */ 897 int 898 config_cfdata_attach(cfdata_t cf, int scannow) 899 { 900 struct cftable *ct; 901 902 ct = kmem_alloc(sizeof(*ct), KM_SLEEP); 903 ct->ct_cfdata = cf; 904 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 905 906 if (scannow) 907 rescan_with_cfdata(cf); 908 909 return 0; 910 } 911 912 /* 913 * Helper for config_cfdata_detach: check whether a device is 914 * found through any attachment in the config data table. 915 */ 916 static int 917 dev_in_cfdata(device_t d, cfdata_t cf) 918 { 919 const struct cfdata *cf1; 920 921 for (cf1 = cf; cf1->cf_name; cf1++) 922 if (d->dv_cfdata == cf1) 923 return 1; 924 925 return 0; 926 } 927 928 /* 929 * Detach a supplemental config data table. Detach all devices found 930 * through that table (and thus keeping references to it) before. 931 */ 932 int 933 config_cfdata_detach(cfdata_t cf) 934 { 935 device_t d; 936 int error = 0; 937 struct cftable *ct; 938 deviter_t di; 939 940 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 941 d = deviter_next(&di)) { 942 if (!dev_in_cfdata(d, cf)) 943 continue; 944 if ((error = config_detach(d, 0)) != 0) 945 break; 946 } 947 deviter_release(&di); 948 if (error) { 949 aprint_error_dev(d, "unable to detach instance\n"); 950 return error; 951 } 952 953 TAILQ_FOREACH(ct, &allcftables, ct_list) { 954 if (ct->ct_cfdata == cf) { 955 TAILQ_REMOVE(&allcftables, ct, ct_list); 956 kmem_free(ct, sizeof(*ct)); 957 return 0; 958 } 959 } 960 961 /* not found -- shouldn't happen */ 962 return EINVAL; 963 } 964 965 /* 966 * Invoke the "match" routine for a cfdata entry on behalf of 967 * an external caller, usually a "submatch" routine. 968 */ 969 int 970 config_match(device_t parent, cfdata_t cf, void *aux) 971 { 972 struct cfattach *ca; 973 974 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 975 if (ca == NULL) { 976 /* No attachment for this entry, oh well. */ 977 return 0; 978 } 979 980 return (*ca->ca_match)(parent, cf, aux); 981 } 982 983 /* 984 * Iterate over all potential children of some device, calling the given 985 * function (default being the child's match function) for each one. 986 * Nonzero returns are matches; the highest value returned is considered 987 * the best match. Return the `found child' if we got a match, or NULL 988 * otherwise. The `aux' pointer is simply passed on through. 989 * 990 * Note that this function is designed so that it can be used to apply 991 * an arbitrary function to all potential children (its return value 992 * can be ignored). 993 */ 994 cfdata_t 995 config_search_loc(cfsubmatch_t fn, device_t parent, 996 const char *ifattr, const int *locs, void *aux) 997 { 998 struct cftable *ct; 999 cfdata_t cf; 1000 struct matchinfo m; 1001 1002 KASSERT(config_initialized); 1003 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 1004 1005 m.fn = fn; 1006 m.parent = parent; 1007 m.locs = locs; 1008 m.aux = aux; 1009 m.match = NULL; 1010 m.pri = 0; 1011 1012 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1013 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1014 1015 /* We don't match root nodes here. */ 1016 if (!cf->cf_pspec) 1017 continue; 1018 1019 /* 1020 * Skip cf if no longer eligible, otherwise scan 1021 * through parents for one matching `parent', and 1022 * try match function. 1023 */ 1024 if (cf->cf_fstate == FSTATE_FOUND) 1025 continue; 1026 if (cf->cf_fstate == FSTATE_DNOTFOUND || 1027 cf->cf_fstate == FSTATE_DSTAR) 1028 continue; 1029 1030 /* 1031 * If an interface attribute was specified, 1032 * consider only children which attach to 1033 * that attribute. 1034 */ 1035 if (ifattr && !STREQ(ifattr, cfdata_ifattr(cf))) 1036 continue; 1037 1038 if (cfparent_match(parent, cf->cf_pspec)) 1039 mapply(&m, cf); 1040 } 1041 } 1042 return m.match; 1043 } 1044 1045 cfdata_t 1046 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 1047 void *aux) 1048 { 1049 1050 return config_search_loc(fn, parent, ifattr, NULL, aux); 1051 } 1052 1053 /* 1054 * Find the given root device. 1055 * This is much like config_search, but there is no parent. 1056 * Don't bother with multiple cfdata tables; the root node 1057 * must always be in the initial table. 1058 */ 1059 cfdata_t 1060 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 1061 { 1062 cfdata_t cf; 1063 const short *p; 1064 struct matchinfo m; 1065 1066 m.fn = fn; 1067 m.parent = ROOT; 1068 m.aux = aux; 1069 m.match = NULL; 1070 m.pri = 0; 1071 m.locs = 0; 1072 /* 1073 * Look at root entries for matching name. We do not bother 1074 * with found-state here since only one root should ever be 1075 * searched (and it must be done first). 1076 */ 1077 for (p = cfroots; *p >= 0; p++) { 1078 cf = &cfdata[*p]; 1079 if (strcmp(cf->cf_name, rootname) == 0) 1080 mapply(&m, cf); 1081 } 1082 return m.match; 1083 } 1084 1085 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 1086 1087 /* 1088 * The given `aux' argument describes a device that has been found 1089 * on the given parent, but not necessarily configured. Locate the 1090 * configuration data for that device (using the submatch function 1091 * provided, or using candidates' cd_match configuration driver 1092 * functions) and attach it, and return its device_t. If the device was 1093 * not configured, call the given `print' function and return NULL. 1094 */ 1095 device_t 1096 config_found_sm_loc(device_t parent, 1097 const char *ifattr, const int *locs, void *aux, 1098 cfprint_t print, cfsubmatch_t submatch) 1099 { 1100 cfdata_t cf; 1101 1102 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 1103 return(config_attach_loc(parent, cf, locs, aux, print)); 1104 if (print) { 1105 if (config_do_twiddle && cold) 1106 twiddle(); 1107 aprint_normal("%s", msgs[(*print)(aux, device_xname(parent))]); 1108 } 1109 1110 /* 1111 * This has the effect of mixing in a single timestamp to the 1112 * entropy pool. Experiments indicate the estimator will almost 1113 * always attribute one bit of entropy to this sample; analysis 1114 * of device attach/detach timestamps on FreeBSD indicates 4 1115 * bits of entropy/sample so this seems appropriately conservative. 1116 */ 1117 rnd_add_uint32(&rnd_autoconf_source, 0); 1118 return NULL; 1119 } 1120 1121 device_t 1122 config_found_ia(device_t parent, const char *ifattr, void *aux, 1123 cfprint_t print) 1124 { 1125 1126 return config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL); 1127 } 1128 1129 device_t 1130 config_found(device_t parent, void *aux, cfprint_t print) 1131 { 1132 1133 return config_found_sm_loc(parent, NULL, NULL, aux, print, NULL); 1134 } 1135 1136 /* 1137 * As above, but for root devices. 1138 */ 1139 device_t 1140 config_rootfound(const char *rootname, void *aux) 1141 { 1142 cfdata_t cf; 1143 1144 if ((cf = config_rootsearch(NULL, rootname, aux)) != NULL) 1145 return config_attach(ROOT, cf, aux, NULL); 1146 aprint_error("root device %s not configured\n", rootname); 1147 return NULL; 1148 } 1149 1150 /* just like sprintf(buf, "%d") except that it works from the end */ 1151 static char * 1152 number(char *ep, int n) 1153 { 1154 1155 *--ep = 0; 1156 while (n >= 10) { 1157 *--ep = (n % 10) + '0'; 1158 n /= 10; 1159 } 1160 *--ep = n + '0'; 1161 return ep; 1162 } 1163 1164 /* 1165 * Expand the size of the cd_devs array if necessary. 1166 * 1167 * The caller must hold alldevs.lock. config_makeroom() may release and 1168 * re-acquire alldevs.lock, so callers should re-check conditions such 1169 * as alldevs.nwrite == 0 and alldevs.nread == 0 when config_makeroom() 1170 * returns. 1171 */ 1172 static void 1173 config_makeroom(int n, struct cfdriver *cd) 1174 { 1175 int ondevs, nndevs; 1176 device_t *osp, *nsp; 1177 1178 KASSERT(mutex_owned(&alldevs.lock)); 1179 alldevs.nwrite++; 1180 1181 for (nndevs = MAX(4, cd->cd_ndevs); nndevs <= n; nndevs += nndevs) 1182 ; 1183 1184 while (n >= cd->cd_ndevs) { 1185 /* 1186 * Need to expand the array. 1187 */ 1188 ondevs = cd->cd_ndevs; 1189 osp = cd->cd_devs; 1190 1191 /* 1192 * Release alldevs.lock around allocation, which may 1193 * sleep. 1194 */ 1195 mutex_exit(&alldevs.lock); 1196 nsp = kmem_alloc(sizeof(device_t[nndevs]), KM_SLEEP); 1197 if (nsp == NULL) 1198 panic("%s: could not expand cd_devs", __func__); 1199 mutex_enter(&alldevs.lock); 1200 1201 /* 1202 * If another thread moved the array while we did 1203 * not hold alldevs.lock, try again. 1204 */ 1205 if (cd->cd_devs != osp) { 1206 mutex_exit(&alldevs.lock); 1207 kmem_free(nsp, sizeof(device_t[nndevs])); 1208 mutex_enter(&alldevs.lock); 1209 continue; 1210 } 1211 1212 memset(nsp + ondevs, 0, sizeof(device_t[nndevs - ondevs])); 1213 if (ondevs != 0) 1214 memcpy(nsp, cd->cd_devs, sizeof(device_t[ondevs])); 1215 1216 cd->cd_ndevs = nndevs; 1217 cd->cd_devs = nsp; 1218 if (ondevs != 0) { 1219 mutex_exit(&alldevs.lock); 1220 kmem_free(osp, sizeof(device_t[ondevs])); 1221 mutex_enter(&alldevs.lock); 1222 } 1223 } 1224 KASSERT(mutex_owned(&alldevs.lock)); 1225 alldevs.nwrite--; 1226 } 1227 1228 /* 1229 * Put dev into the devices list. 1230 */ 1231 static void 1232 config_devlink(device_t dev) 1233 { 1234 1235 mutex_enter(&alldevs.lock); 1236 1237 KASSERT(device_cfdriver(dev)->cd_devs[dev->dv_unit] == dev); 1238 1239 dev->dv_add_gen = alldevs.gen; 1240 /* It is safe to add a device to the tail of the list while 1241 * readers and writers are in the list. 1242 */ 1243 TAILQ_INSERT_TAIL(&alldevs.list, dev, dv_list); 1244 mutex_exit(&alldevs.lock); 1245 } 1246 1247 static void 1248 config_devfree(device_t dev) 1249 { 1250 int priv = (dev->dv_flags & DVF_PRIV_ALLOC); 1251 1252 localcount_fini(&dev->dv_localcnt); 1253 if (dev->dv_cfattach->ca_devsize > 0) 1254 kmem_free(dev->dv_private, dev->dv_cfattach->ca_devsize); 1255 if (priv) 1256 kmem_free(dev, sizeof(*dev)); 1257 } 1258 1259 /* 1260 * Caller must hold alldevs.lock. 1261 */ 1262 static void 1263 config_devunlink(device_t dev, struct devicelist *garbage) 1264 { 1265 struct device_garbage *dg = &dev->dv_garbage; 1266 cfdriver_t cd = device_cfdriver(dev); 1267 int i; 1268 1269 KASSERT(mutex_owned(&alldevs.lock)); 1270 1271 /* Unlink from device list. Link to garbage list. */ 1272 TAILQ_REMOVE(&alldevs.list, dev, dv_list); 1273 TAILQ_INSERT_TAIL(garbage, dev, dv_list); 1274 1275 /* Remove from cfdriver's array. */ 1276 cd->cd_devs[dev->dv_unit] = NULL; 1277 1278 /* 1279 * Release the reference that was held by (the caller of) 1280 * config_detach_release() 1281 */ 1282 device_release(dev); 1283 1284 /* Now wait for references to drain - no new refs are possible */ 1285 localcount_drain(&dev->dv_localcnt, &config_drain_cv, 1286 &alldevs.lock); 1287 1288 /* 1289 * If the device now has no units in use, unlink its softc array. 1290 */ 1291 for (i = 0; i < cd->cd_ndevs; i++) { 1292 if (cd->cd_devs[i] != NULL) 1293 break; 1294 } 1295 /* Nothing found. Unlink, now. Deallocate, later. */ 1296 if (i == cd->cd_ndevs) { 1297 dg->dg_ndevs = cd->cd_ndevs; 1298 dg->dg_devs = cd->cd_devs; 1299 cd->cd_devs = NULL; 1300 cd->cd_ndevs = 0; 1301 } 1302 } 1303 1304 static void 1305 config_devdelete(device_t dev) 1306 { 1307 struct device_garbage *dg = &dev->dv_garbage; 1308 device_lock_t dvl = device_getlock(dev); 1309 1310 if (dg->dg_devs != NULL) 1311 kmem_free(dg->dg_devs, sizeof(device_t[dg->dg_ndevs])); 1312 1313 cv_destroy(&dvl->dvl_cv); 1314 mutex_destroy(&dvl->dvl_mtx); 1315 1316 KASSERT(dev->dv_properties != NULL); 1317 prop_object_release(dev->dv_properties); 1318 1319 if (dev->dv_activity_handlers) 1320 panic("%s with registered handlers", __func__); 1321 1322 if (dev->dv_locators) { 1323 size_t amount = *--dev->dv_locators; 1324 kmem_free(dev->dv_locators, amount); 1325 } 1326 1327 config_devfree(dev); 1328 } 1329 1330 static int 1331 config_unit_nextfree(cfdriver_t cd, cfdata_t cf) 1332 { 1333 int unit; 1334 1335 if (cf->cf_fstate == FSTATE_STAR) { 1336 for (unit = cf->cf_unit; unit < cd->cd_ndevs; unit++) 1337 if (cd->cd_devs[unit] == NULL) 1338 break; 1339 /* 1340 * unit is now the unit of the first NULL device pointer, 1341 * or max(cd->cd_ndevs,cf->cf_unit). 1342 */ 1343 } else { 1344 unit = cf->cf_unit; 1345 if (unit < cd->cd_ndevs && cd->cd_devs[unit] != NULL) 1346 unit = -1; 1347 } 1348 return unit; 1349 } 1350 1351 static int 1352 config_unit_alloc(device_t dev, cfdriver_t cd, cfdata_t cf) 1353 { 1354 struct alldevs_foray af; 1355 int unit; 1356 1357 config_alldevs_enter(&af); 1358 for (;;) { 1359 unit = config_unit_nextfree(cd, cf); 1360 if (unit == -1) 1361 break; 1362 if (unit < cd->cd_ndevs) { 1363 cd->cd_devs[unit] = dev; 1364 dev->dv_unit = unit; 1365 break; 1366 } 1367 config_makeroom(unit, cd); 1368 } 1369 config_alldevs_exit(&af); 1370 1371 return unit; 1372 } 1373 1374 static device_t 1375 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1376 { 1377 cfdriver_t cd; 1378 cfattach_t ca; 1379 size_t lname, lunit; 1380 const char *xunit; 1381 int myunit; 1382 char num[10]; 1383 device_t dev; 1384 void *dev_private; 1385 const struct cfiattrdata *ia; 1386 device_lock_t dvl; 1387 1388 cd = config_cfdriver_lookup(cf->cf_name); 1389 if (cd == NULL) 1390 return NULL; 1391 1392 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1393 if (ca == NULL) 1394 return NULL; 1395 1396 /* get memory for all device vars */ 1397 KASSERTMSG((ca->ca_flags & DVF_PRIV_ALLOC) 1398 || ca->ca_devsize >= sizeof(struct device), 1399 "%s: %s (%zu < %zu)", __func__, cf->cf_atname, ca->ca_devsize, 1400 sizeof(struct device)); 1401 if (ca->ca_devsize > 0) { 1402 dev_private = kmem_zalloc(ca->ca_devsize, KM_SLEEP); 1403 if (dev_private == NULL) 1404 panic("config_devalloc: memory allocation for device " 1405 "softc failed"); 1406 } else { 1407 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1408 dev_private = NULL; 1409 } 1410 1411 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1412 dev = kmem_zalloc(sizeof(*dev), KM_SLEEP); 1413 } else { 1414 dev = dev_private; 1415 #ifdef DIAGNOSTIC 1416 printf("%s has not been converted to device_t\n", cd->cd_name); 1417 #endif 1418 } 1419 KASSERTMSG(dev, "%s: memory allocation for %s device_t failed", 1420 __func__, cd->cd_name); 1421 1422 dev->dv_class = cd->cd_class; 1423 dev->dv_cfdata = cf; 1424 dev->dv_cfdriver = cd; 1425 dev->dv_cfattach = ca; 1426 dev->dv_activity_count = 0; 1427 dev->dv_activity_handlers = NULL; 1428 dev->dv_private = dev_private; 1429 dev->dv_flags = ca->ca_flags; /* inherit flags from class */ 1430 localcount_init(&dev->dv_localcnt); 1431 1432 myunit = config_unit_alloc(dev, cd, cf); 1433 if (myunit == -1) { 1434 config_devfree(dev); 1435 return NULL; 1436 } 1437 1438 /* compute length of name and decimal expansion of unit number */ 1439 lname = strlen(cd->cd_name); 1440 xunit = number(&num[sizeof(num)], myunit); 1441 lunit = &num[sizeof(num)] - xunit; 1442 if (lname + lunit > sizeof(dev->dv_xname)) 1443 panic("config_devalloc: device name too long"); 1444 1445 dvl = device_getlock(dev); 1446 1447 mutex_init(&dvl->dvl_mtx, MUTEX_DEFAULT, IPL_NONE); 1448 cv_init(&dvl->dvl_cv, "pmfsusp"); 1449 1450 memcpy(dev->dv_xname, cd->cd_name, lname); 1451 memcpy(dev->dv_xname + lname, xunit, lunit); 1452 dev->dv_parent = parent; 1453 if (parent != NULL) 1454 dev->dv_depth = parent->dv_depth + 1; 1455 else 1456 dev->dv_depth = 0; 1457 dev->dv_flags |= DVF_ACTIVE; /* always initially active */ 1458 if (locs) { 1459 KASSERT(parent); /* no locators at root */ 1460 ia = cfiattr_lookup(cfdata_ifattr(cf), parent->dv_cfdriver); 1461 dev->dv_locators = 1462 kmem_alloc(sizeof(int [ia->ci_loclen + 1]), KM_SLEEP); 1463 *dev->dv_locators++ = sizeof(int [ia->ci_loclen + 1]); 1464 memcpy(dev->dv_locators, locs, sizeof(int [ia->ci_loclen])); 1465 } 1466 dev->dv_properties = prop_dictionary_create(); 1467 KASSERT(dev->dv_properties != NULL); 1468 1469 prop_dictionary_set_cstring_nocopy(dev->dv_properties, 1470 "device-driver", dev->dv_cfdriver->cd_name); 1471 prop_dictionary_set_uint16(dev->dv_properties, 1472 "device-unit", dev->dv_unit); 1473 if (parent != NULL) { 1474 prop_dictionary_set_cstring(dev->dv_properties, 1475 "device-parent", device_xname(parent)); 1476 } 1477 1478 if (dev->dv_cfdriver->cd_attrs != NULL) 1479 config_add_attrib_dict(dev); 1480 1481 return dev; 1482 } 1483 1484 /* 1485 * Create an array of device attach attributes and add it 1486 * to the device's dv_properties dictionary. 1487 * 1488 * <key>interface-attributes</key> 1489 * <array> 1490 * <dict> 1491 * <key>attribute-name</key> 1492 * <string>foo</string> 1493 * <key>locators</key> 1494 * <array> 1495 * <dict> 1496 * <key>loc-name</key> 1497 * <string>foo-loc1</string> 1498 * </dict> 1499 * <dict> 1500 * <key>loc-name</key> 1501 * <string>foo-loc2</string> 1502 * <key>default</key> 1503 * <string>foo-loc2-default</string> 1504 * </dict> 1505 * ... 1506 * </array> 1507 * </dict> 1508 * ... 1509 * </array> 1510 */ 1511 1512 static void 1513 config_add_attrib_dict(device_t dev) 1514 { 1515 int i, j; 1516 const struct cfiattrdata *ci; 1517 prop_dictionary_t attr_dict, loc_dict; 1518 prop_array_t attr_array, loc_array; 1519 1520 if ((attr_array = prop_array_create()) == NULL) 1521 return; 1522 1523 for (i = 0; ; i++) { 1524 if ((ci = dev->dv_cfdriver->cd_attrs[i]) == NULL) 1525 break; 1526 if ((attr_dict = prop_dictionary_create()) == NULL) 1527 break; 1528 prop_dictionary_set_cstring_nocopy(attr_dict, "attribute-name", 1529 ci->ci_name); 1530 1531 /* Create an array of the locator names and defaults */ 1532 1533 if (ci->ci_loclen != 0 && 1534 (loc_array = prop_array_create()) != NULL) { 1535 for (j = 0; j < ci->ci_loclen; j++) { 1536 loc_dict = prop_dictionary_create(); 1537 if (loc_dict == NULL) 1538 continue; 1539 prop_dictionary_set_cstring_nocopy(loc_dict, 1540 "loc-name", ci->ci_locdesc[j].cld_name); 1541 if (ci->ci_locdesc[j].cld_defaultstr != NULL) 1542 prop_dictionary_set_cstring_nocopy( 1543 loc_dict, "default", 1544 ci->ci_locdesc[j].cld_defaultstr); 1545 prop_array_set(loc_array, j, loc_dict); 1546 prop_object_release(loc_dict); 1547 } 1548 prop_dictionary_set_and_rel(attr_dict, "locators", 1549 loc_array); 1550 } 1551 prop_array_add(attr_array, attr_dict); 1552 prop_object_release(attr_dict); 1553 } 1554 if (i == 0) 1555 prop_object_release(attr_array); 1556 else 1557 prop_dictionary_set_and_rel(dev->dv_properties, 1558 "interface-attributes", attr_array); 1559 1560 return; 1561 } 1562 1563 /* 1564 * Attach a found device. 1565 */ 1566 device_t 1567 config_attach_loc(device_t parent, cfdata_t cf, 1568 const int *locs, void *aux, cfprint_t print) 1569 { 1570 device_t dev; 1571 struct cftable *ct; 1572 const char *drvname; 1573 1574 dev = config_devalloc(parent, cf, locs); 1575 if (!dev) 1576 panic("config_attach: allocation of device softc failed"); 1577 1578 /* XXX redundant - see below? */ 1579 if (cf->cf_fstate != FSTATE_STAR) { 1580 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1581 cf->cf_fstate = FSTATE_FOUND; 1582 } 1583 1584 config_devlink(dev); 1585 1586 if (config_do_twiddle && cold) 1587 twiddle(); 1588 else 1589 aprint_naive("Found "); 1590 /* 1591 * We want the next two printfs for normal, verbose, and quiet, 1592 * but not silent (in which case, we're twiddling, instead). 1593 */ 1594 if (parent == ROOT) { 1595 aprint_naive("%s (root)", device_xname(dev)); 1596 aprint_normal("%s (root)", device_xname(dev)); 1597 } else { 1598 aprint_naive("%s at %s", device_xname(dev), 1599 device_xname(parent)); 1600 aprint_normal("%s at %s", device_xname(dev), 1601 device_xname(parent)); 1602 if (print) 1603 (void) (*print)(aux, NULL); 1604 } 1605 1606 /* 1607 * Before attaching, clobber any unfound devices that are 1608 * otherwise identical. 1609 * XXX code above is redundant? 1610 */ 1611 drvname = dev->dv_cfdriver->cd_name; 1612 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1613 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1614 if (STREQ(cf->cf_name, drvname) && 1615 cf->cf_unit == dev->dv_unit) { 1616 if (cf->cf_fstate == FSTATE_NOTFOUND) 1617 cf->cf_fstate = FSTATE_FOUND; 1618 } 1619 } 1620 } 1621 device_register(dev, aux); 1622 1623 /* Let userland know */ 1624 devmon_report_device(dev, true); 1625 1626 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1627 1628 if (!device_pmf_is_registered(dev)) 1629 aprint_debug_dev(dev, "WARNING: power management not " 1630 "supported\n"); 1631 1632 config_process_deferred(&deferred_config_queue, dev); 1633 1634 device_register_post_config(dev, aux); 1635 return dev; 1636 } 1637 1638 device_t 1639 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1640 { 1641 1642 return config_attach_loc(parent, cf, NULL, aux, print); 1643 } 1644 1645 /* 1646 * As above, but for pseudo-devices. Pseudo-devices attached in this 1647 * way are silently inserted into the device tree, and their children 1648 * attached. 1649 * 1650 * Note that because pseudo-devices are attached silently, any information 1651 * the attach routine wishes to print should be prefixed with the device 1652 * name by the attach routine. 1653 */ 1654 device_t 1655 config_attach_pseudo(cfdata_t cf) 1656 { 1657 device_t dev; 1658 1659 dev = config_devalloc(ROOT, cf, NULL); 1660 if (!dev) 1661 return NULL; 1662 1663 /* XXX mark busy in cfdata */ 1664 1665 if (cf->cf_fstate != FSTATE_STAR) { 1666 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1667 cf->cf_fstate = FSTATE_FOUND; 1668 } 1669 1670 config_devlink(dev); 1671 1672 #if 0 /* XXXJRT not yet */ 1673 device_register(dev, NULL); /* like a root node */ 1674 #endif 1675 1676 /* Let userland know */ 1677 devmon_report_device(dev, true); 1678 1679 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1680 1681 config_process_deferred(&deferred_config_queue, dev); 1682 return dev; 1683 } 1684 1685 /* 1686 * Caller must hold alldevs.lock. 1687 */ 1688 static void 1689 config_collect_garbage(struct devicelist *garbage) 1690 { 1691 device_t dv; 1692 1693 KASSERT(!cpu_intr_p()); 1694 KASSERT(!cpu_softintr_p()); 1695 KASSERT(mutex_owned(&alldevs.lock)); 1696 1697 while (alldevs.nwrite == 0 && alldevs.nread == 0 && alldevs.garbage) { 1698 TAILQ_FOREACH(dv, &alldevs.list, dv_list) { 1699 if (dv->dv_del_gen != 0) 1700 break; 1701 } 1702 if (dv == NULL) { 1703 alldevs.garbage = false; 1704 break; 1705 } 1706 config_devunlink(dv, garbage); 1707 } 1708 KASSERT(mutex_owned(&alldevs.lock)); 1709 } 1710 1711 static void 1712 config_dump_garbage(struct devicelist *garbage) 1713 { 1714 device_t dv; 1715 1716 while ((dv = TAILQ_FIRST(garbage)) != NULL) { 1717 TAILQ_REMOVE(garbage, dv, dv_list); 1718 config_devdelete(dv); 1719 } 1720 } 1721 1722 /* 1723 * Acquire a reference to a device, and then detach it. 1724 */ 1725 int 1726 config_detach(device_t dev, int flags) 1727 { 1728 1729 device_acquire(dev); 1730 return config_detach_release(dev, flags); 1731 } 1732 1733 /* 1734 * Detach a device. Optionally forced (e.g. because of hardware 1735 * removal) and quiet. Returns zero if successful, non-zero 1736 * (an error code) otherwise. 1737 * 1738 * Note that this code wants to be run from a process context, so 1739 * that the detach can sleep to allow processes which have a device 1740 * open to run and unwind their stacks. 1741 * 1742 * Also note that this code requires that the caller have acquired 1743 * a reference to the device; callers that have not been updated 1744 * for localcount should instead call config_detach(). The reference 1745 * is released in all cases. 1746 */ 1747 int 1748 config_detach_release(device_t dev, int flags) 1749 { 1750 struct alldevs_foray af; 1751 struct cftable *ct; 1752 cfdata_t cf; 1753 const struct cfattach *ca; 1754 struct cfdriver *cd; 1755 device_t d __diagused; 1756 int rv = 0; 1757 1758 cf = dev->dv_cfdata; 1759 KASSERTMSG((cf == NULL || cf->cf_fstate == FSTATE_FOUND || 1760 cf->cf_fstate == FSTATE_STAR), 1761 "config_detach: %s: bad device fstate: %d", 1762 device_xname(dev), cf ? cf->cf_fstate : -1); 1763 1764 cd = dev->dv_cfdriver; 1765 KASSERT(cd != NULL); 1766 1767 ca = dev->dv_cfattach; 1768 KASSERT(ca != NULL); 1769 1770 mutex_enter(&alldevs.lock); 1771 if (dev->dv_del_gen != 0) { 1772 mutex_exit(&alldevs.lock); 1773 #ifdef DIAGNOSTIC 1774 printf("%s: %s is already detached\n", __func__, 1775 device_xname(dev)); 1776 #endif /* DIAGNOSTIC */ 1777 device_release(dev); 1778 return ENOENT; 1779 } 1780 alldevs.nwrite++; 1781 mutex_exit(&alldevs.lock); 1782 1783 if (!detachall && 1784 (flags & (DETACH_SHUTDOWN|DETACH_FORCE)) == DETACH_SHUTDOWN && 1785 (dev->dv_flags & DVF_DETACH_SHUTDOWN) == 0) { 1786 rv = EOPNOTSUPP; 1787 } else if (ca->ca_detach != NULL) { 1788 rv = (*ca->ca_detach)(dev, flags); 1789 } else 1790 rv = EOPNOTSUPP; 1791 1792 /* 1793 * If it was not possible to detach the device, then we either 1794 * panic() (for the forced but failed case), or return an error. 1795 * 1796 * If it was possible to detach the device, ensure that the 1797 * device is deactivated. 1798 */ 1799 if (rv == 0) 1800 dev->dv_flags &= ~DVF_ACTIVE; 1801 else if ((flags & DETACH_FORCE) == 0) 1802 goto out; 1803 else { 1804 panic("config_detach: forced detach of %s failed (%d)", 1805 device_xname(dev), rv); 1806 } 1807 1808 /* 1809 * The device has now been successfully detached. 1810 */ 1811 1812 /* Let userland know */ 1813 devmon_report_device(dev, false); 1814 1815 #ifdef DIAGNOSTIC 1816 /* 1817 * Sanity: If you're successfully detached, you should have no 1818 * children. (Note that because children must be attached 1819 * after parents, we only need to search the latter part of 1820 * the list.) 1821 */ 1822 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1823 d = TAILQ_NEXT(d, dv_list)) { 1824 if (d->dv_parent == dev && d->dv_del_gen == 0) { 1825 printf("config_detach: detached device %s" 1826 " has children %s\n", device_xname(dev), 1827 device_xname(d)); 1828 panic("config_detach"); 1829 } 1830 } 1831 #endif 1832 1833 /* notify the parent that the child is gone */ 1834 if (dev->dv_parent) { 1835 device_t p = dev->dv_parent; 1836 if (p->dv_cfattach->ca_childdetached) 1837 (*p->dv_cfattach->ca_childdetached)(p, dev); 1838 } 1839 1840 /* 1841 * Mark cfdata to show that the unit can be reused, if possible. 1842 */ 1843 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1844 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1845 if (STREQ(cf->cf_name, cd->cd_name)) { 1846 if (cf->cf_fstate == FSTATE_FOUND && 1847 cf->cf_unit == dev->dv_unit) 1848 cf->cf_fstate = FSTATE_NOTFOUND; 1849 } 1850 } 1851 } 1852 1853 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1854 aprint_normal_dev(dev, "detached\n"); 1855 1856 out: 1857 config_alldevs_enter(&af); 1858 KASSERT(alldevs.nwrite != 0); 1859 --alldevs.nwrite; 1860 if (rv == 0 && dev->dv_del_gen == 0) { 1861 if (alldevs.nwrite == 0 && alldevs.nread == 0) 1862 config_devunlink(dev, &af.af_garbage); 1863 else { 1864 dev->dv_del_gen = alldevs.gen; 1865 alldevs.garbage = true; 1866 } 1867 } 1868 config_alldevs_exit(&af); 1869 1870 return rv; 1871 } 1872 1873 int 1874 config_detach_children(device_t parent, int flags) 1875 { 1876 device_t dv; 1877 deviter_t di; 1878 int error = 0; 1879 1880 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1881 dv = deviter_next(&di)) { 1882 if (device_parent(dv) != parent) 1883 continue; 1884 if ((error = config_detach(dv, flags)) != 0) 1885 break; 1886 } 1887 deviter_release(&di); 1888 return error; 1889 } 1890 1891 device_t 1892 shutdown_first(struct shutdown_state *s) 1893 { 1894 if (!s->initialized) { 1895 deviter_init(&s->di, DEVITER_F_SHUTDOWN|DEVITER_F_LEAVES_FIRST); 1896 s->initialized = true; 1897 } 1898 return shutdown_next(s); 1899 } 1900 1901 device_t 1902 shutdown_next(struct shutdown_state *s) 1903 { 1904 device_t dv; 1905 1906 while ((dv = deviter_next(&s->di)) != NULL && !device_is_active(dv)) 1907 ; 1908 1909 if (dv == NULL) 1910 s->initialized = false; 1911 1912 return dv; 1913 } 1914 1915 bool 1916 config_detach_all(int how) 1917 { 1918 static struct shutdown_state s; 1919 device_t curdev; 1920 bool progress = false; 1921 int flags; 1922 1923 if ((how & (RB_NOSYNC|RB_DUMP)) != 0) 1924 return false; 1925 1926 if ((how & RB_POWERDOWN) == RB_POWERDOWN) 1927 flags = DETACH_SHUTDOWN | DETACH_POWEROFF; 1928 else 1929 flags = DETACH_SHUTDOWN; 1930 1931 for (curdev = shutdown_first(&s); curdev != NULL; 1932 curdev = shutdown_next(&s)) { 1933 aprint_debug(" detaching %s, ", device_xname(curdev)); 1934 if (config_detach(curdev, flags) == 0) { 1935 progress = true; 1936 aprint_debug("success."); 1937 } else 1938 aprint_debug("failed."); 1939 } 1940 return progress; 1941 } 1942 1943 static bool 1944 device_is_ancestor_of(device_t ancestor, device_t descendant) 1945 { 1946 device_t dv; 1947 1948 for (dv = descendant; dv != NULL; dv = device_parent(dv)) { 1949 if (device_parent(dv) == ancestor) 1950 return true; 1951 } 1952 return false; 1953 } 1954 1955 int 1956 config_deactivate(device_t dev) 1957 { 1958 deviter_t di; 1959 const struct cfattach *ca; 1960 device_t descendant; 1961 int s, rv = 0, oflags; 1962 1963 for (descendant = deviter_first(&di, DEVITER_F_ROOT_FIRST); 1964 descendant != NULL; 1965 descendant = deviter_next(&di)) { 1966 if (dev != descendant && 1967 !device_is_ancestor_of(dev, descendant)) 1968 continue; 1969 1970 if ((descendant->dv_flags & DVF_ACTIVE) == 0) 1971 continue; 1972 1973 ca = descendant->dv_cfattach; 1974 oflags = descendant->dv_flags; 1975 1976 descendant->dv_flags &= ~DVF_ACTIVE; 1977 if (ca->ca_activate == NULL) 1978 continue; 1979 s = splhigh(); 1980 rv = (*ca->ca_activate)(descendant, DVACT_DEACTIVATE); 1981 splx(s); 1982 if (rv != 0) 1983 descendant->dv_flags = oflags; 1984 } 1985 deviter_release(&di); 1986 return rv; 1987 } 1988 1989 /* 1990 * Defer the configuration of the specified device until all 1991 * of its parent's devices have been attached. 1992 */ 1993 void 1994 config_defer(device_t dev, void (*func)(device_t)) 1995 { 1996 struct deferred_config *dc; 1997 1998 if (dev->dv_parent == NULL) 1999 panic("config_defer: can't defer config of a root device"); 2000 2001 #ifdef DIAGNOSTIC 2002 TAILQ_FOREACH(dc, &deferred_config_queue, dc_queue) { 2003 if (dc->dc_dev == dev) 2004 panic("config_defer: deferred twice"); 2005 } 2006 #endif 2007 2008 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2009 if (dc == NULL) 2010 panic("config_defer: unable to allocate callback"); 2011 2012 dc->dc_dev = dev; 2013 dc->dc_func = func; 2014 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 2015 config_pending_incr(dev); 2016 } 2017 2018 /* 2019 * Defer some autoconfiguration for a device until after interrupts 2020 * are enabled. 2021 */ 2022 void 2023 config_interrupts(device_t dev, void (*func)(device_t)) 2024 { 2025 struct deferred_config *dc; 2026 2027 /* 2028 * If interrupts are enabled, callback now. 2029 */ 2030 if (cold == 0) { 2031 (*func)(dev); 2032 return; 2033 } 2034 2035 #ifdef DIAGNOSTIC 2036 TAILQ_FOREACH(dc, &interrupt_config_queue, dc_queue) { 2037 if (dc->dc_dev == dev) 2038 panic("config_interrupts: deferred twice"); 2039 } 2040 #endif 2041 2042 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2043 if (dc == NULL) 2044 panic("config_interrupts: unable to allocate callback"); 2045 2046 dc->dc_dev = dev; 2047 dc->dc_func = func; 2048 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 2049 config_pending_incr(dev); 2050 } 2051 2052 /* 2053 * Defer some autoconfiguration for a device until after root file system 2054 * is mounted (to load firmware etc). 2055 */ 2056 void 2057 config_mountroot(device_t dev, void (*func)(device_t)) 2058 { 2059 struct deferred_config *dc; 2060 2061 /* 2062 * If root file system is mounted, callback now. 2063 */ 2064 if (root_is_mounted) { 2065 (*func)(dev); 2066 return; 2067 } 2068 2069 #ifdef DIAGNOSTIC 2070 TAILQ_FOREACH(dc, &mountroot_config_queue, dc_queue) { 2071 if (dc->dc_dev == dev) 2072 panic("%s: deferred twice", __func__); 2073 } 2074 #endif 2075 2076 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2077 if (dc == NULL) 2078 panic("%s: unable to allocate callback", __func__); 2079 2080 dc->dc_dev = dev; 2081 dc->dc_func = func; 2082 TAILQ_INSERT_TAIL(&mountroot_config_queue, dc, dc_queue); 2083 } 2084 2085 /* 2086 * Process a deferred configuration queue. 2087 */ 2088 static void 2089 config_process_deferred(struct deferred_config_head *queue, device_t parent) 2090 { 2091 struct deferred_config *dc, *ndc; 2092 2093 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 2094 ndc = TAILQ_NEXT(dc, dc_queue); 2095 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 2096 TAILQ_REMOVE(queue, dc, dc_queue); 2097 (*dc->dc_func)(dc->dc_dev); 2098 config_pending_decr(dc->dc_dev); 2099 kmem_free(dc, sizeof(*dc)); 2100 } 2101 } 2102 } 2103 2104 /* 2105 * Manipulate the config_pending semaphore. 2106 */ 2107 void 2108 config_pending_incr(device_t dev) 2109 { 2110 2111 mutex_enter(&config_misc_lock); 2112 config_pending++; 2113 #ifdef DEBUG_AUTOCONF 2114 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2115 #endif 2116 mutex_exit(&config_misc_lock); 2117 } 2118 2119 void 2120 config_pending_decr(device_t dev) 2121 { 2122 2123 KASSERT(0 < config_pending); 2124 mutex_enter(&config_misc_lock); 2125 config_pending--; 2126 #ifdef DEBUG_AUTOCONF 2127 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2128 #endif 2129 if (config_pending == 0) 2130 cv_broadcast(&config_misc_cv); 2131 mutex_exit(&config_misc_lock); 2132 } 2133 2134 /* 2135 * Register a "finalization" routine. Finalization routines are 2136 * called iteratively once all real devices have been found during 2137 * autoconfiguration, for as long as any one finalizer has done 2138 * any work. 2139 */ 2140 int 2141 config_finalize_register(device_t dev, int (*fn)(device_t)) 2142 { 2143 struct finalize_hook *f; 2144 2145 /* 2146 * If finalization has already been done, invoke the 2147 * callback function now. 2148 */ 2149 if (config_finalize_done) { 2150 while ((*fn)(dev) != 0) 2151 /* loop */ ; 2152 return 0; 2153 } 2154 2155 /* Ensure this isn't already on the list. */ 2156 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 2157 if (f->f_func == fn && f->f_dev == dev) 2158 return EEXIST; 2159 } 2160 2161 f = kmem_alloc(sizeof(*f), KM_SLEEP); 2162 f->f_func = fn; 2163 f->f_dev = dev; 2164 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 2165 2166 return 0; 2167 } 2168 2169 void 2170 config_finalize(void) 2171 { 2172 struct finalize_hook *f; 2173 struct pdevinit *pdev; 2174 extern struct pdevinit pdevinit[]; 2175 int errcnt, rv; 2176 2177 /* 2178 * Now that device driver threads have been created, wait for 2179 * them to finish any deferred autoconfiguration. 2180 */ 2181 mutex_enter(&config_misc_lock); 2182 while (config_pending != 0) 2183 cv_wait(&config_misc_cv, &config_misc_lock); 2184 mutex_exit(&config_misc_lock); 2185 2186 KERNEL_LOCK(1, NULL); 2187 2188 /* Attach pseudo-devices. */ 2189 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 2190 (*pdev->pdev_attach)(pdev->pdev_count); 2191 2192 /* Run the hooks until none of them does any work. */ 2193 do { 2194 rv = 0; 2195 TAILQ_FOREACH(f, &config_finalize_list, f_list) 2196 rv |= (*f->f_func)(f->f_dev); 2197 } while (rv != 0); 2198 2199 config_finalize_done = 1; 2200 2201 /* Now free all the hooks. */ 2202 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 2203 TAILQ_REMOVE(&config_finalize_list, f, f_list); 2204 kmem_free(f, sizeof(*f)); 2205 } 2206 2207 KERNEL_UNLOCK_ONE(NULL); 2208 2209 errcnt = aprint_get_error_count(); 2210 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 2211 (boothowto & AB_VERBOSE) == 0) { 2212 mutex_enter(&config_misc_lock); 2213 if (config_do_twiddle) { 2214 config_do_twiddle = 0; 2215 printf_nolog(" done.\n"); 2216 } 2217 mutex_exit(&config_misc_lock); 2218 } 2219 if (errcnt != 0) { 2220 printf("WARNING: %d error%s while detecting hardware; " 2221 "check system log.\n", errcnt, 2222 errcnt == 1 ? "" : "s"); 2223 } 2224 } 2225 2226 void 2227 config_twiddle_init(void) 2228 { 2229 2230 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 2231 config_do_twiddle = 1; 2232 } 2233 callout_setfunc(&config_twiddle_ch, config_twiddle_fn, NULL); 2234 } 2235 2236 void 2237 config_twiddle_fn(void *cookie) 2238 { 2239 2240 mutex_enter(&config_misc_lock); 2241 if (config_do_twiddle) { 2242 twiddle(); 2243 callout_schedule(&config_twiddle_ch, mstohz(100)); 2244 } 2245 mutex_exit(&config_misc_lock); 2246 } 2247 2248 static void 2249 config_alldevs_enter(struct alldevs_foray *af) 2250 { 2251 TAILQ_INIT(&af->af_garbage); 2252 mutex_enter(&alldevs.lock); 2253 config_collect_garbage(&af->af_garbage); 2254 } 2255 2256 static void 2257 config_alldevs_exit(struct alldevs_foray *af) 2258 { 2259 mutex_exit(&alldevs.lock); 2260 config_dump_garbage(&af->af_garbage); 2261 } 2262 2263 /* 2264 * device_acquire: 2265 * 2266 * Acquire a reference to the device. 2267 */ 2268 void 2269 device_acquire(device_t dv) 2270 { 2271 2272 localcount_acquire(&dv->dv_localcnt); 2273 } 2274 2275 /* 2276 * device_lookup: 2277 * 2278 * Look up a device instance for a given driver. 2279 */ 2280 device_t 2281 device_lookup(cfdriver_t cd, int unit) 2282 { 2283 device_t dv; 2284 2285 mutex_enter(&alldevs.lock); 2286 if (unit < 0 || unit >= cd->cd_ndevs) 2287 dv = NULL; 2288 else if ((dv = cd->cd_devs[unit]) != NULL && dv->dv_del_gen != 0) 2289 dv = NULL; 2290 mutex_exit(&alldevs.lock); 2291 2292 return dv; 2293 } 2294 2295 /* 2296 * device_lookup_acquire: 2297 * 2298 * Look up a device instance for a given driver and 2299 * hold a reference to the device. 2300 */ 2301 device_t 2302 device_lookup_acquire(cfdriver_t cd, int unit) 2303 { 2304 device_t dv; 2305 2306 mutex_enter(&alldevs.lock); 2307 if (unit < 0 || unit >= cd->cd_ndevs) 2308 dv = NULL; 2309 else if ((dv = cd->cd_devs[unit]) != NULL && dv->dv_del_gen != 0) 2310 dv = NULL; 2311 if (dv != NULL) 2312 device_acquire(dv); 2313 mutex_exit(&alldevs.lock); 2314 2315 return dv; 2316 } 2317 2318 /* 2319 * device_release: 2320 * 2321 * Release the reference that was created by an earlier call to 2322 * device_acquire() or device_lookup_acquire(). 2323 */ 2324 void 2325 device_release(device_t dv) 2326 { 2327 2328 localcount_release(&dv->dv_localcnt, &config_drain_cv, 2329 &alldevs.lock); 2330 } 2331 2332 /* 2333 * device_lookup_private: 2334 * 2335 * Look up a softc instance for a given driver. 2336 */ 2337 void * 2338 device_lookup_private(cfdriver_t cd, int unit) 2339 { 2340 2341 return device_private(device_lookup(cd, unit)); 2342 } 2343 2344 /* 2345 * device_lookup_private_acquire: 2346 * 2347 * Look up the softc and acquire a reference to the device so it 2348 * won't disappear. Note that the caller must ensure that it is 2349 * capable of calling device_release() at some later point in 2350 * time, thus the returned private data must contain some data 2351 * to locate the original device. Thus the private data must be 2352 * present, not NULL! If this cannot be guaranteed, the caller 2353 * should use device_lookup_acquire() in order to retain the 2354 * device_t pointer. 2355 */ 2356 void * 2357 device_lookup_private_acquire(cfdriver_t cd, int unit) 2358 { 2359 device_t dv; 2360 void *p; 2361 2362 dv = device_lookup_acquire(cd, unit); 2363 p = device_private(dv); 2364 KASSERTMSG(p != NULL || dv == NULL, 2365 "%s: device %s has no private data", __func__, cd->cd_name); 2366 return p; 2367 } 2368 2369 /* 2370 * device_find_by_xname: 2371 * 2372 * Returns the device of the given name or NULL if it doesn't exist. 2373 */ 2374 device_t 2375 device_find_by_xname(const char *name) 2376 { 2377 device_t dv; 2378 deviter_t di; 2379 2380 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 2381 if (strcmp(device_xname(dv), name) == 0) 2382 break; 2383 } 2384 deviter_release(&di); 2385 2386 return dv; 2387 } 2388 2389 /* 2390 * device_find_by_driver_unit: 2391 * 2392 * Returns the device of the given driver name and unit or 2393 * NULL if it doesn't exist. 2394 */ 2395 device_t 2396 device_find_by_driver_unit(const char *name, int unit) 2397 { 2398 struct cfdriver *cd; 2399 2400 if ((cd = config_cfdriver_lookup(name)) == NULL) 2401 return NULL; 2402 return device_lookup(cd, unit); 2403 } 2404 2405 /* 2406 * device_find_by_driver_unit_acquire: 2407 * 2408 * Returns the device of the given driver name and unit or 2409 * NULL if it doesn't exist. If driver is found, it's 2410 * reference count is incremented so it won't go away. 2411 */ 2412 device_t 2413 device_find_by_driver_unit_acquire(const char *name, int unit) 2414 { 2415 struct cfdriver *cd; 2416 2417 if ((cd = config_cfdriver_lookup(name)) == NULL) 2418 return NULL; 2419 return device_lookup_acquire(cd, unit); 2420 } 2421 2422 /* 2423 * Power management related functions. 2424 */ 2425 2426 bool 2427 device_pmf_is_registered(device_t dev) 2428 { 2429 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 2430 } 2431 2432 bool 2433 device_pmf_driver_suspend(device_t dev, const pmf_qual_t *qual) 2434 { 2435 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2436 return true; 2437 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2438 return false; 2439 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2440 dev->dv_driver_suspend != NULL && 2441 !(*dev->dv_driver_suspend)(dev, qual)) 2442 return false; 2443 2444 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 2445 return true; 2446 } 2447 2448 bool 2449 device_pmf_driver_resume(device_t dev, const pmf_qual_t *qual) 2450 { 2451 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2452 return true; 2453 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2454 return false; 2455 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2456 dev->dv_driver_resume != NULL && 2457 !(*dev->dv_driver_resume)(dev, qual)) 2458 return false; 2459 2460 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2461 return true; 2462 } 2463 2464 bool 2465 device_pmf_driver_shutdown(device_t dev, int how) 2466 { 2467 2468 if (*dev->dv_driver_shutdown != NULL && 2469 !(*dev->dv_driver_shutdown)(dev, how)) 2470 return false; 2471 return true; 2472 } 2473 2474 bool 2475 device_pmf_driver_register(device_t dev, 2476 bool (*suspend)(device_t, const pmf_qual_t *), 2477 bool (*resume)(device_t, const pmf_qual_t *), 2478 bool (*shutdown)(device_t, int)) 2479 { 2480 dev->dv_driver_suspend = suspend; 2481 dev->dv_driver_resume = resume; 2482 dev->dv_driver_shutdown = shutdown; 2483 dev->dv_flags |= DVF_POWER_HANDLERS; 2484 return true; 2485 } 2486 2487 static const char * 2488 curlwp_name(void) 2489 { 2490 if (curlwp->l_name != NULL) 2491 return curlwp->l_name; 2492 else 2493 return curlwp->l_proc->p_comm; 2494 } 2495 2496 void 2497 device_pmf_driver_deregister(device_t dev) 2498 { 2499 device_lock_t dvl = device_getlock(dev); 2500 2501 dev->dv_driver_suspend = NULL; 2502 dev->dv_driver_resume = NULL; 2503 2504 mutex_enter(&dvl->dvl_mtx); 2505 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2506 while (dvl->dvl_nlock > 0 || dvl->dvl_nwait > 0) { 2507 /* Wake a thread that waits for the lock. That 2508 * thread will fail to acquire the lock, and then 2509 * it will wake the next thread that waits for the 2510 * lock, or else it will wake us. 2511 */ 2512 cv_signal(&dvl->dvl_cv); 2513 pmflock_debug(dev, __func__, __LINE__); 2514 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2515 pmflock_debug(dev, __func__, __LINE__); 2516 } 2517 mutex_exit(&dvl->dvl_mtx); 2518 } 2519 2520 bool 2521 device_pmf_driver_child_register(device_t dev) 2522 { 2523 device_t parent = device_parent(dev); 2524 2525 if (parent == NULL || parent->dv_driver_child_register == NULL) 2526 return true; 2527 return (*parent->dv_driver_child_register)(dev); 2528 } 2529 2530 void 2531 device_pmf_driver_set_child_register(device_t dev, 2532 bool (*child_register)(device_t)) 2533 { 2534 dev->dv_driver_child_register = child_register; 2535 } 2536 2537 static void 2538 pmflock_debug(device_t dev, const char *func, int line) 2539 { 2540 device_lock_t dvl = device_getlock(dev); 2541 2542 aprint_debug_dev(dev, 2543 "%s.%d, %s dvl_nlock %d dvl_nwait %d dv_flags %x\n", func, line, 2544 curlwp_name(), dvl->dvl_nlock, dvl->dvl_nwait, dev->dv_flags); 2545 } 2546 2547 static bool 2548 device_pmf_lock1(device_t dev) 2549 { 2550 device_lock_t dvl = device_getlock(dev); 2551 2552 while (device_pmf_is_registered(dev) && 2553 dvl->dvl_nlock > 0 && dvl->dvl_holder != curlwp) { 2554 dvl->dvl_nwait++; 2555 pmflock_debug(dev, __func__, __LINE__); 2556 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2557 pmflock_debug(dev, __func__, __LINE__); 2558 dvl->dvl_nwait--; 2559 } 2560 if (!device_pmf_is_registered(dev)) { 2561 pmflock_debug(dev, __func__, __LINE__); 2562 /* We could not acquire the lock, but some other thread may 2563 * wait for it, also. Wake that thread. 2564 */ 2565 cv_signal(&dvl->dvl_cv); 2566 return false; 2567 } 2568 dvl->dvl_nlock++; 2569 dvl->dvl_holder = curlwp; 2570 pmflock_debug(dev, __func__, __LINE__); 2571 return true; 2572 } 2573 2574 bool 2575 device_pmf_lock(device_t dev) 2576 { 2577 bool rc; 2578 device_lock_t dvl = device_getlock(dev); 2579 2580 mutex_enter(&dvl->dvl_mtx); 2581 rc = device_pmf_lock1(dev); 2582 mutex_exit(&dvl->dvl_mtx); 2583 2584 return rc; 2585 } 2586 2587 void 2588 device_pmf_unlock(device_t dev) 2589 { 2590 device_lock_t dvl = device_getlock(dev); 2591 2592 KASSERT(dvl->dvl_nlock > 0); 2593 mutex_enter(&dvl->dvl_mtx); 2594 if (--dvl->dvl_nlock == 0) 2595 dvl->dvl_holder = NULL; 2596 cv_signal(&dvl->dvl_cv); 2597 pmflock_debug(dev, __func__, __LINE__); 2598 mutex_exit(&dvl->dvl_mtx); 2599 } 2600 2601 device_lock_t 2602 device_getlock(device_t dev) 2603 { 2604 return &dev->dv_lock; 2605 } 2606 2607 void * 2608 device_pmf_bus_private(device_t dev) 2609 { 2610 return dev->dv_bus_private; 2611 } 2612 2613 bool 2614 device_pmf_bus_suspend(device_t dev, const pmf_qual_t *qual) 2615 { 2616 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2617 return true; 2618 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2619 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2620 return false; 2621 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2622 dev->dv_bus_suspend != NULL && 2623 !(*dev->dv_bus_suspend)(dev, qual)) 2624 return false; 2625 2626 dev->dv_flags |= DVF_BUS_SUSPENDED; 2627 return true; 2628 } 2629 2630 bool 2631 device_pmf_bus_resume(device_t dev, const pmf_qual_t *qual) 2632 { 2633 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2634 return true; 2635 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2636 dev->dv_bus_resume != NULL && 2637 !(*dev->dv_bus_resume)(dev, qual)) 2638 return false; 2639 2640 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2641 return true; 2642 } 2643 2644 bool 2645 device_pmf_bus_shutdown(device_t dev, int how) 2646 { 2647 2648 if (*dev->dv_bus_shutdown != NULL && 2649 !(*dev->dv_bus_shutdown)(dev, how)) 2650 return false; 2651 return true; 2652 } 2653 2654 void 2655 device_pmf_bus_register(device_t dev, void *priv, 2656 bool (*suspend)(device_t, const pmf_qual_t *), 2657 bool (*resume)(device_t, const pmf_qual_t *), 2658 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2659 { 2660 dev->dv_bus_private = priv; 2661 dev->dv_bus_resume = resume; 2662 dev->dv_bus_suspend = suspend; 2663 dev->dv_bus_shutdown = shutdown; 2664 dev->dv_bus_deregister = deregister; 2665 } 2666 2667 void 2668 device_pmf_bus_deregister(device_t dev) 2669 { 2670 if (dev->dv_bus_deregister == NULL) 2671 return; 2672 (*dev->dv_bus_deregister)(dev); 2673 dev->dv_bus_private = NULL; 2674 dev->dv_bus_suspend = NULL; 2675 dev->dv_bus_resume = NULL; 2676 dev->dv_bus_deregister = NULL; 2677 } 2678 2679 void * 2680 device_pmf_class_private(device_t dev) 2681 { 2682 return dev->dv_class_private; 2683 } 2684 2685 bool 2686 device_pmf_class_suspend(device_t dev, const pmf_qual_t *qual) 2687 { 2688 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2689 return true; 2690 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2691 dev->dv_class_suspend != NULL && 2692 !(*dev->dv_class_suspend)(dev, qual)) 2693 return false; 2694 2695 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2696 return true; 2697 } 2698 2699 bool 2700 device_pmf_class_resume(device_t dev, const pmf_qual_t *qual) 2701 { 2702 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2703 return true; 2704 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2705 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2706 return false; 2707 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2708 dev->dv_class_resume != NULL && 2709 !(*dev->dv_class_resume)(dev, qual)) 2710 return false; 2711 2712 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2713 return true; 2714 } 2715 2716 void 2717 device_pmf_class_register(device_t dev, void *priv, 2718 bool (*suspend)(device_t, const pmf_qual_t *), 2719 bool (*resume)(device_t, const pmf_qual_t *), 2720 void (*deregister)(device_t)) 2721 { 2722 dev->dv_class_private = priv; 2723 dev->dv_class_suspend = suspend; 2724 dev->dv_class_resume = resume; 2725 dev->dv_class_deregister = deregister; 2726 } 2727 2728 void 2729 device_pmf_class_deregister(device_t dev) 2730 { 2731 if (dev->dv_class_deregister == NULL) 2732 return; 2733 (*dev->dv_class_deregister)(dev); 2734 dev->dv_class_private = NULL; 2735 dev->dv_class_suspend = NULL; 2736 dev->dv_class_resume = NULL; 2737 dev->dv_class_deregister = NULL; 2738 } 2739 2740 bool 2741 device_active(device_t dev, devactive_t type) 2742 { 2743 size_t i; 2744 2745 if (dev->dv_activity_count == 0) 2746 return false; 2747 2748 for (i = 0; i < dev->dv_activity_count; ++i) { 2749 if (dev->dv_activity_handlers[i] == NULL) 2750 break; 2751 (*dev->dv_activity_handlers[i])(dev, type); 2752 } 2753 2754 return true; 2755 } 2756 2757 bool 2758 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2759 { 2760 void (**new_handlers)(device_t, devactive_t); 2761 void (**old_handlers)(device_t, devactive_t); 2762 size_t i, old_size, new_size; 2763 int s; 2764 2765 old_handlers = dev->dv_activity_handlers; 2766 old_size = dev->dv_activity_count; 2767 2768 KASSERT(old_size == 0 || old_handlers != NULL); 2769 2770 for (i = 0; i < old_size; ++i) { 2771 KASSERT(old_handlers[i] != handler); 2772 if (old_handlers[i] == NULL) { 2773 old_handlers[i] = handler; 2774 return true; 2775 } 2776 } 2777 2778 new_size = old_size + 4; 2779 new_handlers = kmem_alloc(sizeof(void *[new_size]), KM_SLEEP); 2780 2781 for (i = 0; i < old_size; ++i) 2782 new_handlers[i] = old_handlers[i]; 2783 new_handlers[old_size] = handler; 2784 for (i = old_size+1; i < new_size; ++i) 2785 new_handlers[i] = NULL; 2786 2787 s = splhigh(); 2788 dev->dv_activity_count = new_size; 2789 dev->dv_activity_handlers = new_handlers; 2790 splx(s); 2791 2792 if (old_size > 0) 2793 kmem_free(old_handlers, sizeof(void * [old_size])); 2794 2795 return true; 2796 } 2797 2798 void 2799 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2800 { 2801 void (**old_handlers)(device_t, devactive_t); 2802 size_t i, old_size; 2803 int s; 2804 2805 old_handlers = dev->dv_activity_handlers; 2806 old_size = dev->dv_activity_count; 2807 2808 for (i = 0; i < old_size; ++i) { 2809 if (old_handlers[i] == handler) 2810 break; 2811 if (old_handlers[i] == NULL) 2812 return; /* XXX panic? */ 2813 } 2814 2815 if (i == old_size) 2816 return; /* XXX panic? */ 2817 2818 for (; i < old_size - 1; ++i) { 2819 if ((old_handlers[i] = old_handlers[i + 1]) != NULL) 2820 continue; 2821 2822 if (i == 0) { 2823 s = splhigh(); 2824 dev->dv_activity_count = 0; 2825 dev->dv_activity_handlers = NULL; 2826 splx(s); 2827 kmem_free(old_handlers, sizeof(void *[old_size])); 2828 } 2829 return; 2830 } 2831 old_handlers[i] = NULL; 2832 } 2833 2834 /* Return true iff the device_t `dev' exists at generation `gen'. */ 2835 static bool 2836 device_exists_at(device_t dv, devgen_t gen) 2837 { 2838 return (dv->dv_del_gen == 0 || dv->dv_del_gen > gen) && 2839 dv->dv_add_gen <= gen; 2840 } 2841 2842 static bool 2843 deviter_visits(const deviter_t *di, device_t dv) 2844 { 2845 return device_exists_at(dv, di->di_gen); 2846 } 2847 2848 /* 2849 * Device Iteration 2850 * 2851 * deviter_t: a device iterator. Holds state for a "walk" visiting 2852 * each device_t's in the device tree. 2853 * 2854 * deviter_init(di, flags): initialize the device iterator `di' 2855 * to "walk" the device tree. deviter_next(di) will return 2856 * the first device_t in the device tree, or NULL if there are 2857 * no devices. 2858 * 2859 * `flags' is one or more of DEVITER_F_RW, indicating that the 2860 * caller intends to modify the device tree by calling 2861 * config_detach(9) on devices in the order that the iterator 2862 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2863 * nearest the "root" of the device tree to be returned, first; 2864 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2865 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2866 * indicating both that deviter_init() should not respect any 2867 * locks on the device tree, and that deviter_next(di) may run 2868 * in more than one LWP before the walk has finished. 2869 * 2870 * Only one DEVITER_F_RW iterator may be in the device tree at 2871 * once. 2872 * 2873 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2874 * 2875 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2876 * DEVITER_F_LEAVES_FIRST are used in combination. 2877 * 2878 * deviter_first(di, flags): initialize the device iterator `di' 2879 * and return the first device_t in the device tree, or NULL 2880 * if there are no devices. The statement 2881 * 2882 * dv = deviter_first(di); 2883 * 2884 * is shorthand for 2885 * 2886 * deviter_init(di); 2887 * dv = deviter_next(di); 2888 * 2889 * deviter_next(di): return the next device_t in the device tree, 2890 * or NULL if there are no more devices. deviter_next(di) 2891 * is undefined if `di' was not initialized with deviter_init() or 2892 * deviter_first(). 2893 * 2894 * deviter_release(di): stops iteration (subsequent calls to 2895 * deviter_next() will return NULL), releases any locks and 2896 * resources held by the device iterator. 2897 * 2898 * Device iteration does not return device_t's in any particular 2899 * order. An iterator will never return the same device_t twice. 2900 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2901 * is called repeatedly on the same `di', it will eventually return 2902 * NULL. It is ok to attach/detach devices during device iteration. 2903 */ 2904 void 2905 deviter_init(deviter_t *di, deviter_flags_t flags) 2906 { 2907 device_t dv; 2908 2909 memset(di, 0, sizeof(*di)); 2910 2911 if ((flags & DEVITER_F_SHUTDOWN) != 0) 2912 flags |= DEVITER_F_RW; 2913 2914 mutex_enter(&alldevs.lock); 2915 if ((flags & DEVITER_F_RW) != 0) 2916 alldevs.nwrite++; 2917 else 2918 alldevs.nread++; 2919 di->di_gen = alldevs.gen++; 2920 di->di_flags = flags; 2921 2922 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2923 case DEVITER_F_LEAVES_FIRST: 2924 TAILQ_FOREACH(dv, &alldevs.list, dv_list) { 2925 if (!deviter_visits(di, dv)) 2926 continue; 2927 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2928 } 2929 break; 2930 case DEVITER_F_ROOT_FIRST: 2931 TAILQ_FOREACH(dv, &alldevs.list, dv_list) { 2932 if (!deviter_visits(di, dv)) 2933 continue; 2934 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2935 } 2936 break; 2937 default: 2938 break; 2939 } 2940 2941 deviter_reinit(di); 2942 mutex_exit(&alldevs.lock); 2943 } 2944 2945 static void 2946 deviter_reinit(deviter_t *di) 2947 { 2948 2949 KASSERT(mutex_owned(&alldevs.lock)); 2950 if ((di->di_flags & DEVITER_F_RW) != 0) 2951 di->di_prev = TAILQ_LAST(&alldevs.list, devicelist); 2952 else 2953 di->di_prev = TAILQ_FIRST(&alldevs.list); 2954 } 2955 2956 device_t 2957 deviter_first(deviter_t *di, deviter_flags_t flags) 2958 { 2959 2960 deviter_init(di, flags); 2961 return deviter_next(di); 2962 } 2963 2964 static device_t 2965 deviter_next2(deviter_t *di) 2966 { 2967 device_t dv; 2968 2969 KASSERT(mutex_owned(&alldevs.lock)); 2970 2971 dv = di->di_prev; 2972 2973 if (dv == NULL) 2974 return NULL; 2975 2976 if ((di->di_flags & DEVITER_F_RW) != 0) 2977 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2978 else 2979 di->di_prev = TAILQ_NEXT(dv, dv_list); 2980 2981 return dv; 2982 } 2983 2984 static device_t 2985 deviter_next1(deviter_t *di) 2986 { 2987 device_t dv; 2988 2989 KASSERT(mutex_owned(&alldevs.lock)); 2990 2991 do { 2992 dv = deviter_next2(di); 2993 } while (dv != NULL && !deviter_visits(di, dv)); 2994 2995 return dv; 2996 } 2997 2998 device_t 2999 deviter_next(deviter_t *di) 3000 { 3001 device_t dv = NULL; 3002 3003 mutex_enter(&alldevs.lock); 3004 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 3005 case 0: 3006 dv = deviter_next1(di); 3007 break; 3008 case DEVITER_F_LEAVES_FIRST: 3009 while (di->di_curdepth >= 0) { 3010 if ((dv = deviter_next1(di)) == NULL) { 3011 di->di_curdepth--; 3012 deviter_reinit(di); 3013 } else if (dv->dv_depth == di->di_curdepth) 3014 break; 3015 } 3016 break; 3017 case DEVITER_F_ROOT_FIRST: 3018 while (di->di_curdepth <= di->di_maxdepth) { 3019 if ((dv = deviter_next1(di)) == NULL) { 3020 di->di_curdepth++; 3021 deviter_reinit(di); 3022 } else if (dv->dv_depth == di->di_curdepth) 3023 break; 3024 } 3025 break; 3026 default: 3027 break; 3028 } 3029 mutex_exit(&alldevs.lock); 3030 3031 return dv; 3032 } 3033 3034 void 3035 deviter_release(deviter_t *di) 3036 { 3037 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 3038 3039 mutex_enter(&alldevs.lock); 3040 if (rw) 3041 --alldevs.nwrite; 3042 else 3043 --alldevs.nread; 3044 /* XXX wake a garbage-collection thread */ 3045 mutex_exit(&alldevs.lock); 3046 } 3047 3048 const char * 3049 cfdata_ifattr(const struct cfdata *cf) 3050 { 3051 return cf->cf_pspec->cfp_iattr; 3052 } 3053 3054 bool 3055 ifattr_match(const char *snull, const char *t) 3056 { 3057 return (snull == NULL) || strcmp(snull, t) == 0; 3058 } 3059 3060 void 3061 null_childdetached(device_t self, device_t child) 3062 { 3063 /* do nothing */ 3064 } 3065 3066 static void 3067 sysctl_detach_setup(struct sysctllog **clog) 3068 { 3069 3070 sysctl_createv(clog, 0, NULL, NULL, 3071 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 3072 CTLTYPE_BOOL, "detachall", 3073 SYSCTL_DESCR("Detach all devices at shutdown"), 3074 NULL, 0, &detachall, 0, 3075 CTL_KERN, CTL_CREATE, CTL_EOL); 3076 } 3077
Indexes created Sat Sep 27 22:09:54 GMT 2025