subr_autoconf.c revision 1.246.2.8
1 /* $NetBSD: subr_autoconf.c,v 1.246.2.8 2017/03/20 06:57:47 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 1.246.2.8 2017/03/20 06:57:47 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 if (dev->dv_localcnt != NULL) { 1253 localcount_fini(dev->dv_localcnt); 1254 kmem_free(dev->dv_localcnt, sizeof(*dev->dv_localcnt)); 1255 } 1256 if (dev->dv_cfattach->ca_devsize > 0) 1257 kmem_free(dev->dv_private, dev->dv_cfattach->ca_devsize); 1258 if (priv) 1259 kmem_free(dev, sizeof(*dev)); 1260 } 1261 1262 /* 1263 * Caller must hold alldevs.lock. 1264 */ 1265 static void 1266 config_devunlink(device_t dev, struct devicelist *garbage) 1267 { 1268 struct device_garbage *dg = &dev->dv_garbage; 1269 cfdriver_t cd = device_cfdriver(dev); 1270 int i; 1271 1272 KASSERT(mutex_owned(&alldevs.lock)); 1273 1274 /* Unlink from device list. Link to garbage list. */ 1275 TAILQ_REMOVE(&alldevs.list, dev, dv_list); 1276 TAILQ_INSERT_TAIL(garbage, dev, dv_list); 1277 1278 /* Remove from cfdriver's array. */ 1279 cd->cd_devs[dev->dv_unit] = NULL; 1280 1281 /* Now wait for references to drain - no new refs are possible */ 1282 localcount_drain(dev->dv_localcnt, &config_drain_cv, 1283 &alldevs_mtx); 1284 1285 /* 1286 * If the device now has no units in use, unlink its softc array. 1287 */ 1288 for (i = 0; i < cd->cd_ndevs; i++) { 1289 if (cd->cd_devs[i] != NULL) 1290 break; 1291 } 1292 /* Nothing found. Unlink, now. Deallocate, later. */ 1293 if (i == cd->cd_ndevs) { 1294 dg->dg_ndevs = cd->cd_ndevs; 1295 dg->dg_devs = cd->cd_devs; 1296 cd->cd_devs = NULL; 1297 cd->cd_ndevs = 0; 1298 } 1299 } 1300 1301 static void 1302 config_devdelete(device_t dev) 1303 { 1304 struct device_garbage *dg = &dev->dv_garbage; 1305 device_lock_t dvl = device_getlock(dev); 1306 1307 if (dg->dg_devs != NULL) 1308 kmem_free(dg->dg_devs, sizeof(device_t[dg->dg_ndevs])); 1309 1310 cv_destroy(&dvl->dvl_cv); 1311 mutex_destroy(&dvl->dvl_mtx); 1312 1313 KASSERT(dev->dv_properties != NULL); 1314 prop_object_release(dev->dv_properties); 1315 1316 if (dev->dv_activity_handlers) 1317 panic("%s with registered handlers", __func__); 1318 1319 if (dev->dv_locators) { 1320 size_t amount = *--dev->dv_locators; 1321 kmem_free(dev->dv_locators, amount); 1322 } 1323 1324 config_devfree(dev); 1325 } 1326 1327 static int 1328 config_unit_nextfree(cfdriver_t cd, cfdata_t cf) 1329 { 1330 int unit; 1331 1332 if (cf->cf_fstate == FSTATE_STAR) { 1333 for (unit = cf->cf_unit; unit < cd->cd_ndevs; unit++) 1334 if (cd->cd_devs[unit] == NULL) 1335 break; 1336 /* 1337 * unit is now the unit of the first NULL device pointer, 1338 * or max(cd->cd_ndevs,cf->cf_unit). 1339 */ 1340 } else { 1341 unit = cf->cf_unit; 1342 if (unit < cd->cd_ndevs && cd->cd_devs[unit] != NULL) 1343 unit = -1; 1344 } 1345 return unit; 1346 } 1347 1348 static int 1349 config_unit_alloc(device_t dev, cfdriver_t cd, cfdata_t cf) 1350 { 1351 struct alldevs_foray af; 1352 int unit; 1353 1354 config_alldevs_enter(&af); 1355 for (;;) { 1356 unit = config_unit_nextfree(cd, cf); 1357 if (unit == -1) 1358 break; 1359 if (unit < cd->cd_ndevs) { 1360 cd->cd_devs[unit] = dev; 1361 dev->dv_unit = unit; 1362 break; 1363 } 1364 config_makeroom(unit, cd); 1365 } 1366 config_alldevs_exit(&af); 1367 1368 return unit; 1369 } 1370 1371 static device_t 1372 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1373 { 1374 cfdriver_t cd; 1375 cfattach_t ca; 1376 size_t lname, lunit; 1377 const char *xunit; 1378 int myunit; 1379 char num[10]; 1380 device_t dev; 1381 void *dev_private; 1382 const struct cfiattrdata *ia; 1383 device_lock_t dvl; 1384 1385 cd = config_cfdriver_lookup(cf->cf_name); 1386 if (cd == NULL) 1387 return NULL; 1388 1389 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1390 if (ca == NULL) 1391 return NULL; 1392 1393 /* get memory for all device vars */ 1394 KASSERTMSG((ca->ca_flags & DVF_PRIV_ALLOC) 1395 || ca->ca_devsize >= sizeof(struct device), 1396 "%s: %s (%zu < %zu)", __func__, cf->cf_atname, ca->ca_devsize, 1397 sizeof(struct device)); 1398 if (ca->ca_devsize > 0) { 1399 dev_private = kmem_zalloc(ca->ca_devsize, KM_SLEEP); 1400 if (dev_private == NULL) 1401 panic("config_devalloc: memory allocation for device " 1402 "softc failed"); 1403 } else { 1404 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1405 dev_private = NULL; 1406 } 1407 1408 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1409 dev = kmem_zalloc(sizeof(*dev), KM_SLEEP); 1410 } else { 1411 dev = dev_private; 1412 #ifdef DIAGNOSTIC 1413 printf("%s has not been converted to device_t\n", cd->cd_name); 1414 #endif 1415 } 1416 KASSERTMSG(dev, "%s: memory allocation for %s device_t failed", 1417 __func__, cd->cd_name); 1418 1419 dev->dv_class = cd->cd_class; 1420 dev->dv_cfdata = cf; 1421 dev->dv_cfdriver = cd; 1422 dev->dv_cfattach = ca; 1423 dev->dv_activity_count = 0; 1424 dev->dv_activity_handlers = NULL; 1425 dev->dv_private = dev_private; 1426 dev->dv_flags = ca->ca_flags; /* inherit flags from class */ 1427 dev->dv_localcnt = kmem_alloc(sizeof(*dev->dv_localcnt), KM_SLEEP); 1428 KASSERTMSG(dev->dv_localcnt, "%s: unable to allocate localcnt for %s", 1429 __func__, cd->cd_name); 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 * Detach a device. Optionally forced (e.g. because of hardware 1724 * removal) and quiet. Returns zero if successful, non-zero 1725 * (an error code) otherwise. 1726 * 1727 * Note that this code wants to be run from a process context, so 1728 * that the detach can sleep to allow processes which have a device 1729 * open to run and unwind their stacks. 1730 */ 1731 int 1732 config_detach(device_t dev, int flags) 1733 { 1734 struct alldevs_foray af; 1735 struct cftable *ct; 1736 cfdata_t cf; 1737 const struct cfattach *ca; 1738 struct cfdriver *cd; 1739 device_t d __diagused; 1740 int rv = 0; 1741 1742 cf = dev->dv_cfdata; 1743 KASSERTMSG((cf == NULL || cf->cf_fstate == FSTATE_FOUND || 1744 cf->cf_fstate == FSTATE_STAR), 1745 "config_detach: %s: bad device fstate: %d", 1746 device_xname(dev), cf ? cf->cf_fstate : -1); 1747 1748 cd = dev->dv_cfdriver; 1749 KASSERT(cd != NULL); 1750 1751 ca = dev->dv_cfattach; 1752 KASSERT(ca != NULL); 1753 1754 mutex_enter(&alldevs.lock); 1755 if (dev->dv_del_gen != 0) { 1756 mutex_exit(&alldevs.lock); 1757 #ifdef DIAGNOSTIC 1758 printf("%s: %s is already detached\n", __func__, 1759 device_xname(dev)); 1760 #endif /* DIAGNOSTIC */ 1761 return ENOENT; 1762 } 1763 alldevs.nwrite++; 1764 mutex_exit(&alldevs.lock); 1765 1766 if (!detachall && 1767 (flags & (DETACH_SHUTDOWN|DETACH_FORCE)) == DETACH_SHUTDOWN && 1768 (dev->dv_flags & DVF_DETACH_SHUTDOWN) == 0) { 1769 rv = EOPNOTSUPP; 1770 } else if (ca->ca_detach != NULL) { 1771 rv = (*ca->ca_detach)(dev, flags); 1772 } else 1773 rv = EOPNOTSUPP; 1774 1775 /* 1776 * If it was not possible to detach the device, then we either 1777 * panic() (for the forced but failed case), or return an error. 1778 * 1779 * If it was possible to detach the device, ensure that the 1780 * device is deactivated. 1781 */ 1782 if (rv == 0) 1783 dev->dv_flags &= ~DVF_ACTIVE; 1784 else if ((flags & DETACH_FORCE) == 0) 1785 goto out; 1786 else { 1787 panic("config_detach: forced detach of %s failed (%d)", 1788 device_xname(dev), rv); 1789 } 1790 1791 /* 1792 * The device has now been successfully detached. 1793 */ 1794 1795 /* Let userland know */ 1796 devmon_report_device(dev, false); 1797 1798 #ifdef DIAGNOSTIC 1799 /* 1800 * Sanity: If you're successfully detached, you should have no 1801 * children. (Note that because children must be attached 1802 * after parents, we only need to search the latter part of 1803 * the list.) 1804 */ 1805 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1806 d = TAILQ_NEXT(d, dv_list)) { 1807 if (d->dv_parent == dev && d->dv_del_gen == 0) { 1808 printf("config_detach: detached device %s" 1809 " has children %s\n", device_xname(dev), 1810 device_xname(d)); 1811 panic("config_detach"); 1812 } 1813 } 1814 #endif 1815 1816 /* notify the parent that the child is gone */ 1817 if (dev->dv_parent) { 1818 device_t p = dev->dv_parent; 1819 if (p->dv_cfattach->ca_childdetached) 1820 (*p->dv_cfattach->ca_childdetached)(p, dev); 1821 } 1822 1823 /* 1824 * Mark cfdata to show that the unit can be reused, if possible. 1825 */ 1826 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1827 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1828 if (STREQ(cf->cf_name, cd->cd_name)) { 1829 if (cf->cf_fstate == FSTATE_FOUND && 1830 cf->cf_unit == dev->dv_unit) 1831 cf->cf_fstate = FSTATE_NOTFOUND; 1832 } 1833 } 1834 } 1835 1836 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1837 aprint_normal_dev(dev, "detached\n"); 1838 1839 out: 1840 config_alldevs_enter(&af); 1841 KASSERT(alldevs.nwrite != 0); 1842 --alldevs.nwrite; 1843 if (rv == 0 && dev->dv_del_gen == 0) { 1844 if (alldevs.nwrite == 0 && alldevs.nread == 0) 1845 config_devunlink(dev, &af.af_garbage); 1846 else { 1847 dev->dv_del_gen = alldevs.gen; 1848 alldevs.garbage = true; 1849 } 1850 } 1851 config_alldevs_exit(&af); 1852 1853 return rv; 1854 } 1855 1856 int 1857 config_detach_children(device_t parent, int flags) 1858 { 1859 device_t dv; 1860 deviter_t di; 1861 int error = 0; 1862 1863 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1864 dv = deviter_next(&di)) { 1865 if (device_parent(dv) != parent) 1866 continue; 1867 if ((error = config_detach(dv, flags)) != 0) 1868 break; 1869 } 1870 deviter_release(&di); 1871 return error; 1872 } 1873 1874 device_t 1875 shutdown_first(struct shutdown_state *s) 1876 { 1877 if (!s->initialized) { 1878 deviter_init(&s->di, DEVITER_F_SHUTDOWN|DEVITER_F_LEAVES_FIRST); 1879 s->initialized = true; 1880 } 1881 return shutdown_next(s); 1882 } 1883 1884 device_t 1885 shutdown_next(struct shutdown_state *s) 1886 { 1887 device_t dv; 1888 1889 while ((dv = deviter_next(&s->di)) != NULL && !device_is_active(dv)) 1890 ; 1891 1892 if (dv == NULL) 1893 s->initialized = false; 1894 1895 return dv; 1896 } 1897 1898 bool 1899 config_detach_all(int how) 1900 { 1901 static struct shutdown_state s; 1902 device_t curdev; 1903 bool progress = false; 1904 int flags; 1905 1906 if ((how & (RB_NOSYNC|RB_DUMP)) != 0) 1907 return false; 1908 1909 if ((how & RB_POWERDOWN) == RB_POWERDOWN) 1910 flags = DETACH_SHUTDOWN | DETACH_POWEROFF; 1911 else 1912 flags = DETACH_SHUTDOWN; 1913 1914 for (curdev = shutdown_first(&s); curdev != NULL; 1915 curdev = shutdown_next(&s)) { 1916 aprint_debug(" detaching %s, ", device_xname(curdev)); 1917 if (config_detach(curdev, flags) == 0) { 1918 progress = true; 1919 aprint_debug("success."); 1920 } else 1921 aprint_debug("failed."); 1922 } 1923 return progress; 1924 } 1925 1926 static bool 1927 device_is_ancestor_of(device_t ancestor, device_t descendant) 1928 { 1929 device_t dv; 1930 1931 for (dv = descendant; dv != NULL; dv = device_parent(dv)) { 1932 if (device_parent(dv) == ancestor) 1933 return true; 1934 } 1935 return false; 1936 } 1937 1938 int 1939 config_deactivate(device_t dev) 1940 { 1941 deviter_t di; 1942 const struct cfattach *ca; 1943 device_t descendant; 1944 int s, rv = 0, oflags; 1945 1946 for (descendant = deviter_first(&di, DEVITER_F_ROOT_FIRST); 1947 descendant != NULL; 1948 descendant = deviter_next(&di)) { 1949 if (dev != descendant && 1950 !device_is_ancestor_of(dev, descendant)) 1951 continue; 1952 1953 if ((descendant->dv_flags & DVF_ACTIVE) == 0) 1954 continue; 1955 1956 ca = descendant->dv_cfattach; 1957 oflags = descendant->dv_flags; 1958 1959 descendant->dv_flags &= ~DVF_ACTIVE; 1960 if (ca->ca_activate == NULL) 1961 continue; 1962 s = splhigh(); 1963 rv = (*ca->ca_activate)(descendant, DVACT_DEACTIVATE); 1964 splx(s); 1965 if (rv != 0) 1966 descendant->dv_flags = oflags; 1967 } 1968 deviter_release(&di); 1969 return rv; 1970 } 1971 1972 /* 1973 * Defer the configuration of the specified device until all 1974 * of its parent's devices have been attached. 1975 */ 1976 void 1977 config_defer(device_t dev, void (*func)(device_t)) 1978 { 1979 struct deferred_config *dc; 1980 1981 if (dev->dv_parent == NULL) 1982 panic("config_defer: can't defer config of a root device"); 1983 1984 #ifdef DIAGNOSTIC 1985 TAILQ_FOREACH(dc, &deferred_config_queue, dc_queue) { 1986 if (dc->dc_dev == dev) 1987 panic("config_defer: deferred twice"); 1988 } 1989 #endif 1990 1991 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1992 if (dc == NULL) 1993 panic("config_defer: unable to allocate callback"); 1994 1995 dc->dc_dev = dev; 1996 dc->dc_func = func; 1997 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1998 config_pending_incr(dev); 1999 } 2000 2001 /* 2002 * Defer some autoconfiguration for a device until after interrupts 2003 * are enabled. 2004 */ 2005 void 2006 config_interrupts(device_t dev, void (*func)(device_t)) 2007 { 2008 struct deferred_config *dc; 2009 2010 /* 2011 * If interrupts are enabled, callback now. 2012 */ 2013 if (cold == 0) { 2014 (*func)(dev); 2015 return; 2016 } 2017 2018 #ifdef DIAGNOSTIC 2019 TAILQ_FOREACH(dc, &interrupt_config_queue, dc_queue) { 2020 if (dc->dc_dev == dev) 2021 panic("config_interrupts: deferred twice"); 2022 } 2023 #endif 2024 2025 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2026 if (dc == NULL) 2027 panic("config_interrupts: unable to allocate callback"); 2028 2029 dc->dc_dev = dev; 2030 dc->dc_func = func; 2031 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 2032 config_pending_incr(dev); 2033 } 2034 2035 /* 2036 * Defer some autoconfiguration for a device until after root file system 2037 * is mounted (to load firmware etc). 2038 */ 2039 void 2040 config_mountroot(device_t dev, void (*func)(device_t)) 2041 { 2042 struct deferred_config *dc; 2043 2044 /* 2045 * If root file system is mounted, callback now. 2046 */ 2047 if (root_is_mounted) { 2048 (*func)(dev); 2049 return; 2050 } 2051 2052 #ifdef DIAGNOSTIC 2053 TAILQ_FOREACH(dc, &mountroot_config_queue, dc_queue) { 2054 if (dc->dc_dev == dev) 2055 panic("%s: deferred twice", __func__); 2056 } 2057 #endif 2058 2059 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 2060 if (dc == NULL) 2061 panic("%s: unable to allocate callback", __func__); 2062 2063 dc->dc_dev = dev; 2064 dc->dc_func = func; 2065 TAILQ_INSERT_TAIL(&mountroot_config_queue, dc, dc_queue); 2066 } 2067 2068 /* 2069 * Process a deferred configuration queue. 2070 */ 2071 static void 2072 config_process_deferred(struct deferred_config_head *queue, device_t parent) 2073 { 2074 struct deferred_config *dc, *ndc; 2075 2076 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 2077 ndc = TAILQ_NEXT(dc, dc_queue); 2078 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 2079 TAILQ_REMOVE(queue, dc, dc_queue); 2080 (*dc->dc_func)(dc->dc_dev); 2081 config_pending_decr(dc->dc_dev); 2082 kmem_free(dc, sizeof(*dc)); 2083 } 2084 } 2085 } 2086 2087 /* 2088 * Manipulate the config_pending semaphore. 2089 */ 2090 void 2091 config_pending_incr(device_t dev) 2092 { 2093 2094 mutex_enter(&config_misc_lock); 2095 config_pending++; 2096 #ifdef DEBUG_AUTOCONF 2097 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2098 #endif 2099 mutex_exit(&config_misc_lock); 2100 } 2101 2102 void 2103 config_pending_decr(device_t dev) 2104 { 2105 2106 KASSERT(0 < config_pending); 2107 mutex_enter(&config_misc_lock); 2108 config_pending--; 2109 #ifdef DEBUG_AUTOCONF 2110 printf("%s: %s %d\n", __func__, device_xname(dev), config_pending); 2111 #endif 2112 if (config_pending == 0) 2113 cv_broadcast(&config_misc_cv); 2114 mutex_exit(&config_misc_lock); 2115 } 2116 2117 /* 2118 * Register a "finalization" routine. Finalization routines are 2119 * called iteratively once all real devices have been found during 2120 * autoconfiguration, for as long as any one finalizer has done 2121 * any work. 2122 */ 2123 int 2124 config_finalize_register(device_t dev, int (*fn)(device_t)) 2125 { 2126 struct finalize_hook *f; 2127 2128 /* 2129 * If finalization has already been done, invoke the 2130 * callback function now. 2131 */ 2132 if (config_finalize_done) { 2133 while ((*fn)(dev) != 0) 2134 /* loop */ ; 2135 return 0; 2136 } 2137 2138 /* Ensure this isn't already on the list. */ 2139 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 2140 if (f->f_func == fn && f->f_dev == dev) 2141 return EEXIST; 2142 } 2143 2144 f = kmem_alloc(sizeof(*f), KM_SLEEP); 2145 f->f_func = fn; 2146 f->f_dev = dev; 2147 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 2148 2149 return 0; 2150 } 2151 2152 void 2153 config_finalize(void) 2154 { 2155 struct finalize_hook *f; 2156 struct pdevinit *pdev; 2157 extern struct pdevinit pdevinit[]; 2158 int errcnt, rv; 2159 2160 /* 2161 * Now that device driver threads have been created, wait for 2162 * them to finish any deferred autoconfiguration. 2163 */ 2164 mutex_enter(&config_misc_lock); 2165 while (config_pending != 0) 2166 cv_wait(&config_misc_cv, &config_misc_lock); 2167 mutex_exit(&config_misc_lock); 2168 2169 KERNEL_LOCK(1, NULL); 2170 2171 /* Attach pseudo-devices. */ 2172 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 2173 (*pdev->pdev_attach)(pdev->pdev_count); 2174 2175 /* Run the hooks until none of them does any work. */ 2176 do { 2177 rv = 0; 2178 TAILQ_FOREACH(f, &config_finalize_list, f_list) 2179 rv |= (*f->f_func)(f->f_dev); 2180 } while (rv != 0); 2181 2182 config_finalize_done = 1; 2183 2184 /* Now free all the hooks. */ 2185 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 2186 TAILQ_REMOVE(&config_finalize_list, f, f_list); 2187 kmem_free(f, sizeof(*f)); 2188 } 2189 2190 KERNEL_UNLOCK_ONE(NULL); 2191 2192 errcnt = aprint_get_error_count(); 2193 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 2194 (boothowto & AB_VERBOSE) == 0) { 2195 mutex_enter(&config_misc_lock); 2196 if (config_do_twiddle) { 2197 config_do_twiddle = 0; 2198 printf_nolog(" done.\n"); 2199 } 2200 mutex_exit(&config_misc_lock); 2201 } 2202 if (errcnt != 0) { 2203 printf("WARNING: %d error%s while detecting hardware; " 2204 "check system log.\n", errcnt, 2205 errcnt == 1 ? "" : "s"); 2206 } 2207 } 2208 2209 void 2210 config_twiddle_init(void) 2211 { 2212 2213 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 2214 config_do_twiddle = 1; 2215 } 2216 callout_setfunc(&config_twiddle_ch, config_twiddle_fn, NULL); 2217 } 2218 2219 void 2220 config_twiddle_fn(void *cookie) 2221 { 2222 2223 mutex_enter(&config_misc_lock); 2224 if (config_do_twiddle) { 2225 twiddle(); 2226 callout_schedule(&config_twiddle_ch, mstohz(100)); 2227 } 2228 mutex_exit(&config_misc_lock); 2229 } 2230 2231 static void 2232 config_alldevs_enter(struct alldevs_foray *af) 2233 { 2234 TAILQ_INIT(&af->af_garbage); 2235 mutex_enter(&alldevs.lock); 2236 config_collect_garbage(&af->af_garbage); 2237 } 2238 2239 static void 2240 config_alldevs_exit(struct alldevs_foray *af) 2241 { 2242 mutex_exit(&alldevs.lock); 2243 config_dump_garbage(&af->af_garbage); 2244 } 2245 2246 /* 2247 * device_acquire: 2248 * 2249 * Acquire a reference to the device. 2250 */ 2251 void 2252 device_acquire(device_t dv) 2253 { 2254 2255 if (dv->dv_localcnt != NULL) 2256 localcount_acquire(dv->dv_localcnt); 2257 } 2258 2259 /* 2260 * device_lookup: 2261 * 2262 * Look up a device instance for a given driver. 2263 */ 2264 device_t 2265 device_lookup(cfdriver_t cd, int unit) 2266 { 2267 device_t dv; 2268 2269 mutex_enter(&alldevs.lock); 2270 if (unit < 0 || unit >= cd->cd_ndevs) 2271 dv = NULL; 2272 else if ((dv = cd->cd_devs[unit]) != NULL && dv->dv_del_gen != 0) 2273 dv = NULL; 2274 mutex_exit(&alldevs.lock); 2275 2276 return dv; 2277 } 2278 2279 /* 2280 * device_lookup_acquire: 2281 * 2282 * Look up a device instance for a given driver and 2283 * hold a reference to the device. 2284 */ 2285 device_t 2286 device_lookup_acquire(cfdriver_t cd, int unit) 2287 { 2288 device_t dv; 2289 2290 mutex_enter(&alldevs_mtx); 2291 if (unit < 0 || unit >= cd->cd_ndevs) 2292 dv = NULL; 2293 else if ((dv = cd->cd_devs[unit]) != NULL && dv->dv_del_gen != 0) 2294 dv = NULL; 2295 if (dv != NULL) 2296 device_acquire(dv); 2297 mutex_exit(&alldevs_mtx); 2298 2299 return dv; 2300 } 2301 2302 /* 2303 * device_release: 2304 * 2305 * Release the reference that was created by an earlier call to 2306 * device_acquire() or device_lookup_acquire(). 2307 */ 2308 void 2309 device_release(device_t dv) 2310 { 2311 2312 localcount_release(dv->dv_localcnt, &config_drain_cv, 2313 &alldevs_mtx); 2314 } 2315 2316 /* 2317 * device_lookup_private: 2318 * 2319 * Look up a softc instance for a given driver. 2320 */ 2321 void * 2322 device_lookup_private(cfdriver_t cd, int unit) 2323 { 2324 2325 return device_private(device_lookup(cd, unit)); 2326 } 2327 2328 /* 2329 * device_lookup_private_acquire: 2330 * 2331 * Look up the softc and acquire a reference to the device so it 2332 * won't disappear. Note that the caller must ensure that it is 2333 * capable of calling device_release() at some later point in 2334 * time, thus the returned private data must contain some data 2335 * to locate the original device. Thus the private data must be 2336 * present, not NULL! If this cannot be guaranteed, the caller 2337 * should use device_lookup_acquire() in order to retain the 2338 * device_t pointer. 2339 */ 2340 void * 2341 device_lookup_private_acquire(cfdriver_t cd, int unit) 2342 { 2343 device_t dv; 2344 void *p; 2345 2346 dv = device_lookup_acquire(cd, unit); 2347 p = device_private(dv); 2348 KASSERTMSG(p != NULL || dv == NULL, 2349 "%s: device %s has no private data", __func__, cd->cd_name); 2350 return p; 2351 } 2352 2353 /* 2354 * device_find_by_xname: 2355 * 2356 * Returns the device of the given name or NULL if it doesn't exist. 2357 */ 2358 device_t 2359 device_find_by_xname(const char *name) 2360 { 2361 device_t dv; 2362 deviter_t di; 2363 2364 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 2365 if (strcmp(device_xname(dv), name) == 0) 2366 break; 2367 } 2368 deviter_release(&di); 2369 2370 return dv; 2371 } 2372 2373 /* 2374 * device_find_by_driver_unit: 2375 * 2376 * Returns the device of the given driver name and unit or 2377 * NULL if it doesn't exist. 2378 */ 2379 device_t 2380 device_find_by_driver_unit(const char *name, int unit) 2381 { 2382 struct cfdriver *cd; 2383 2384 if ((cd = config_cfdriver_lookup(name)) == NULL) 2385 return NULL; 2386 return device_lookup(cd, unit); 2387 } 2388 2389 /* 2390 * device_find_by_driver_unit_acquire: 2391 * 2392 * Returns the device of the given driver name and unit or 2393 * NULL if it doesn't exist. If driver is found, it's 2394 * reference count is incremented so it won't go away. 2395 */ 2396 device_t 2397 device_find_by_driver_unit_acquire(const char *name, int unit) 2398 { 2399 struct cfdriver *cd; 2400 2401 if ((cd = config_cfdriver_lookup(name)) == NULL) 2402 return NULL; 2403 return device_lookup_acquire(cd, unit); 2404 } 2405 2406 /* 2407 * Power management related functions. 2408 */ 2409 2410 bool 2411 device_pmf_is_registered(device_t dev) 2412 { 2413 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 2414 } 2415 2416 bool 2417 device_pmf_driver_suspend(device_t dev, const pmf_qual_t *qual) 2418 { 2419 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2420 return true; 2421 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2422 return false; 2423 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2424 dev->dv_driver_suspend != NULL && 2425 !(*dev->dv_driver_suspend)(dev, qual)) 2426 return false; 2427 2428 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 2429 return true; 2430 } 2431 2432 bool 2433 device_pmf_driver_resume(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_BUS_SUSPENDED) != 0) 2438 return false; 2439 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_DRIVER && 2440 dev->dv_driver_resume != NULL && 2441 !(*dev->dv_driver_resume)(dev, qual)) 2442 return false; 2443 2444 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2445 return true; 2446 } 2447 2448 bool 2449 device_pmf_driver_shutdown(device_t dev, int how) 2450 { 2451 2452 if (*dev->dv_driver_shutdown != NULL && 2453 !(*dev->dv_driver_shutdown)(dev, how)) 2454 return false; 2455 return true; 2456 } 2457 2458 bool 2459 device_pmf_driver_register(device_t dev, 2460 bool (*suspend)(device_t, const pmf_qual_t *), 2461 bool (*resume)(device_t, const pmf_qual_t *), 2462 bool (*shutdown)(device_t, int)) 2463 { 2464 dev->dv_driver_suspend = suspend; 2465 dev->dv_driver_resume = resume; 2466 dev->dv_driver_shutdown = shutdown; 2467 dev->dv_flags |= DVF_POWER_HANDLERS; 2468 return true; 2469 } 2470 2471 static const char * 2472 curlwp_name(void) 2473 { 2474 if (curlwp->l_name != NULL) 2475 return curlwp->l_name; 2476 else 2477 return curlwp->l_proc->p_comm; 2478 } 2479 2480 void 2481 device_pmf_driver_deregister(device_t dev) 2482 { 2483 device_lock_t dvl = device_getlock(dev); 2484 2485 dev->dv_driver_suspend = NULL; 2486 dev->dv_driver_resume = NULL; 2487 2488 mutex_enter(&dvl->dvl_mtx); 2489 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2490 while (dvl->dvl_nlock > 0 || dvl->dvl_nwait > 0) { 2491 /* Wake a thread that waits for the lock. That 2492 * thread will fail to acquire the lock, and then 2493 * it will wake the next thread that waits for the 2494 * lock, or else it will wake us. 2495 */ 2496 cv_signal(&dvl->dvl_cv); 2497 pmflock_debug(dev, __func__, __LINE__); 2498 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2499 pmflock_debug(dev, __func__, __LINE__); 2500 } 2501 mutex_exit(&dvl->dvl_mtx); 2502 } 2503 2504 bool 2505 device_pmf_driver_child_register(device_t dev) 2506 { 2507 device_t parent = device_parent(dev); 2508 2509 if (parent == NULL || parent->dv_driver_child_register == NULL) 2510 return true; 2511 return (*parent->dv_driver_child_register)(dev); 2512 } 2513 2514 void 2515 device_pmf_driver_set_child_register(device_t dev, 2516 bool (*child_register)(device_t)) 2517 { 2518 dev->dv_driver_child_register = child_register; 2519 } 2520 2521 static void 2522 pmflock_debug(device_t dev, const char *func, int line) 2523 { 2524 device_lock_t dvl = device_getlock(dev); 2525 2526 aprint_debug_dev(dev, 2527 "%s.%d, %s dvl_nlock %d dvl_nwait %d dv_flags %x\n", func, line, 2528 curlwp_name(), dvl->dvl_nlock, dvl->dvl_nwait, dev->dv_flags); 2529 } 2530 2531 static bool 2532 device_pmf_lock1(device_t dev) 2533 { 2534 device_lock_t dvl = device_getlock(dev); 2535 2536 while (device_pmf_is_registered(dev) && 2537 dvl->dvl_nlock > 0 && dvl->dvl_holder != curlwp) { 2538 dvl->dvl_nwait++; 2539 pmflock_debug(dev, __func__, __LINE__); 2540 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2541 pmflock_debug(dev, __func__, __LINE__); 2542 dvl->dvl_nwait--; 2543 } 2544 if (!device_pmf_is_registered(dev)) { 2545 pmflock_debug(dev, __func__, __LINE__); 2546 /* We could not acquire the lock, but some other thread may 2547 * wait for it, also. Wake that thread. 2548 */ 2549 cv_signal(&dvl->dvl_cv); 2550 return false; 2551 } 2552 dvl->dvl_nlock++; 2553 dvl->dvl_holder = curlwp; 2554 pmflock_debug(dev, __func__, __LINE__); 2555 return true; 2556 } 2557 2558 bool 2559 device_pmf_lock(device_t dev) 2560 { 2561 bool rc; 2562 device_lock_t dvl = device_getlock(dev); 2563 2564 mutex_enter(&dvl->dvl_mtx); 2565 rc = device_pmf_lock1(dev); 2566 mutex_exit(&dvl->dvl_mtx); 2567 2568 return rc; 2569 } 2570 2571 void 2572 device_pmf_unlock(device_t dev) 2573 { 2574 device_lock_t dvl = device_getlock(dev); 2575 2576 KASSERT(dvl->dvl_nlock > 0); 2577 mutex_enter(&dvl->dvl_mtx); 2578 if (--dvl->dvl_nlock == 0) 2579 dvl->dvl_holder = NULL; 2580 cv_signal(&dvl->dvl_cv); 2581 pmflock_debug(dev, __func__, __LINE__); 2582 mutex_exit(&dvl->dvl_mtx); 2583 } 2584 2585 device_lock_t 2586 device_getlock(device_t dev) 2587 { 2588 return &dev->dv_lock; 2589 } 2590 2591 void * 2592 device_pmf_bus_private(device_t dev) 2593 { 2594 return dev->dv_bus_private; 2595 } 2596 2597 bool 2598 device_pmf_bus_suspend(device_t dev, const pmf_qual_t *qual) 2599 { 2600 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2601 return true; 2602 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2603 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2604 return false; 2605 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2606 dev->dv_bus_suspend != NULL && 2607 !(*dev->dv_bus_suspend)(dev, qual)) 2608 return false; 2609 2610 dev->dv_flags |= DVF_BUS_SUSPENDED; 2611 return true; 2612 } 2613 2614 bool 2615 device_pmf_bus_resume(device_t dev, const pmf_qual_t *qual) 2616 { 2617 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2618 return true; 2619 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_BUS && 2620 dev->dv_bus_resume != NULL && 2621 !(*dev->dv_bus_resume)(dev, qual)) 2622 return false; 2623 2624 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2625 return true; 2626 } 2627 2628 bool 2629 device_pmf_bus_shutdown(device_t dev, int how) 2630 { 2631 2632 if (*dev->dv_bus_shutdown != NULL && 2633 !(*dev->dv_bus_shutdown)(dev, how)) 2634 return false; 2635 return true; 2636 } 2637 2638 void 2639 device_pmf_bus_register(device_t dev, void *priv, 2640 bool (*suspend)(device_t, const pmf_qual_t *), 2641 bool (*resume)(device_t, const pmf_qual_t *), 2642 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2643 { 2644 dev->dv_bus_private = priv; 2645 dev->dv_bus_resume = resume; 2646 dev->dv_bus_suspend = suspend; 2647 dev->dv_bus_shutdown = shutdown; 2648 dev->dv_bus_deregister = deregister; 2649 } 2650 2651 void 2652 device_pmf_bus_deregister(device_t dev) 2653 { 2654 if (dev->dv_bus_deregister == NULL) 2655 return; 2656 (*dev->dv_bus_deregister)(dev); 2657 dev->dv_bus_private = NULL; 2658 dev->dv_bus_suspend = NULL; 2659 dev->dv_bus_resume = NULL; 2660 dev->dv_bus_deregister = NULL; 2661 } 2662 2663 void * 2664 device_pmf_class_private(device_t dev) 2665 { 2666 return dev->dv_class_private; 2667 } 2668 2669 bool 2670 device_pmf_class_suspend(device_t dev, const pmf_qual_t *qual) 2671 { 2672 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2673 return true; 2674 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2675 dev->dv_class_suspend != NULL && 2676 !(*dev->dv_class_suspend)(dev, qual)) 2677 return false; 2678 2679 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2680 return true; 2681 } 2682 2683 bool 2684 device_pmf_class_resume(device_t dev, const pmf_qual_t *qual) 2685 { 2686 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2687 return true; 2688 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2689 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2690 return false; 2691 if (pmf_qual_depth(qual) <= DEVACT_LEVEL_CLASS && 2692 dev->dv_class_resume != NULL && 2693 !(*dev->dv_class_resume)(dev, qual)) 2694 return false; 2695 2696 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2697 return true; 2698 } 2699 2700 void 2701 device_pmf_class_register(device_t dev, void *priv, 2702 bool (*suspend)(device_t, const pmf_qual_t *), 2703 bool (*resume)(device_t, const pmf_qual_t *), 2704 void (*deregister)(device_t)) 2705 { 2706 dev->dv_class_private = priv; 2707 dev->dv_class_suspend = suspend; 2708 dev->dv_class_resume = resume; 2709 dev->dv_class_deregister = deregister; 2710 } 2711 2712 void 2713 device_pmf_class_deregister(device_t dev) 2714 { 2715 if (dev->dv_class_deregister == NULL) 2716 return; 2717 (*dev->dv_class_deregister)(dev); 2718 dev->dv_class_private = NULL; 2719 dev->dv_class_suspend = NULL; 2720 dev->dv_class_resume = NULL; 2721 dev->dv_class_deregister = NULL; 2722 } 2723 2724 bool 2725 device_active(device_t dev, devactive_t type) 2726 { 2727 size_t i; 2728 2729 if (dev->dv_activity_count == 0) 2730 return false; 2731 2732 for (i = 0; i < dev->dv_activity_count; ++i) { 2733 if (dev->dv_activity_handlers[i] == NULL) 2734 break; 2735 (*dev->dv_activity_handlers[i])(dev, type); 2736 } 2737 2738 return true; 2739 } 2740 2741 bool 2742 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2743 { 2744 void (**new_handlers)(device_t, devactive_t); 2745 void (**old_handlers)(device_t, devactive_t); 2746 size_t i, old_size, new_size; 2747 int s; 2748 2749 old_handlers = dev->dv_activity_handlers; 2750 old_size = dev->dv_activity_count; 2751 2752 KASSERT(old_size == 0 || old_handlers != NULL); 2753 2754 for (i = 0; i < old_size; ++i) { 2755 KASSERT(old_handlers[i] != handler); 2756 if (old_handlers[i] == NULL) { 2757 old_handlers[i] = handler; 2758 return true; 2759 } 2760 } 2761 2762 new_size = old_size + 4; 2763 new_handlers = kmem_alloc(sizeof(void *[new_size]), KM_SLEEP); 2764 2765 for (i = 0; i < old_size; ++i) 2766 new_handlers[i] = old_handlers[i]; 2767 new_handlers[old_size] = handler; 2768 for (i = old_size+1; i < new_size; ++i) 2769 new_handlers[i] = NULL; 2770 2771 s = splhigh(); 2772 dev->dv_activity_count = new_size; 2773 dev->dv_activity_handlers = new_handlers; 2774 splx(s); 2775 2776 if (old_size > 0) 2777 kmem_free(old_handlers, sizeof(void * [old_size])); 2778 2779 return true; 2780 } 2781 2782 void 2783 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2784 { 2785 void (**old_handlers)(device_t, devactive_t); 2786 size_t i, old_size; 2787 int s; 2788 2789 old_handlers = dev->dv_activity_handlers; 2790 old_size = dev->dv_activity_count; 2791 2792 for (i = 0; i < old_size; ++i) { 2793 if (old_handlers[i] == handler) 2794 break; 2795 if (old_handlers[i] == NULL) 2796 return; /* XXX panic? */ 2797 } 2798 2799 if (i == old_size) 2800 return; /* XXX panic? */ 2801 2802 for (; i < old_size - 1; ++i) { 2803 if ((old_handlers[i] = old_handlers[i + 1]) != NULL) 2804 continue; 2805 2806 if (i == 0) { 2807 s = splhigh(); 2808 dev->dv_activity_count = 0; 2809 dev->dv_activity_handlers = NULL; 2810 splx(s); 2811 kmem_free(old_handlers, sizeof(void *[old_size])); 2812 } 2813 return; 2814 } 2815 old_handlers[i] = NULL; 2816 } 2817 2818 /* Return true iff the device_t `dev' exists at generation `gen'. */ 2819 static bool 2820 device_exists_at(device_t dv, devgen_t gen) 2821 { 2822 return (dv->dv_del_gen == 0 || dv->dv_del_gen > gen) && 2823 dv->dv_add_gen <= gen; 2824 } 2825 2826 static bool 2827 deviter_visits(const deviter_t *di, device_t dv) 2828 { 2829 return device_exists_at(dv, di->di_gen); 2830 } 2831 2832 /* 2833 * Device Iteration 2834 * 2835 * deviter_t: a device iterator. Holds state for a "walk" visiting 2836 * each device_t's in the device tree. 2837 * 2838 * deviter_init(di, flags): initialize the device iterator `di' 2839 * to "walk" the device tree. deviter_next(di) will return 2840 * the first device_t in the device tree, or NULL if there are 2841 * no devices. 2842 * 2843 * `flags' is one or more of DEVITER_F_RW, indicating that the 2844 * caller intends to modify the device tree by calling 2845 * config_detach(9) on devices in the order that the iterator 2846 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2847 * nearest the "root" of the device tree to be returned, first; 2848 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2849 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2850 * indicating both that deviter_init() should not respect any 2851 * locks on the device tree, and that deviter_next(di) may run 2852 * in more than one LWP before the walk has finished. 2853 * 2854 * Only one DEVITER_F_RW iterator may be in the device tree at 2855 * once. 2856 * 2857 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2858 * 2859 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2860 * DEVITER_F_LEAVES_FIRST are used in combination. 2861 * 2862 * deviter_first(di, flags): initialize the device iterator `di' 2863 * and return the first device_t in the device tree, or NULL 2864 * if there are no devices. The statement 2865 * 2866 * dv = deviter_first(di); 2867 * 2868 * is shorthand for 2869 * 2870 * deviter_init(di); 2871 * dv = deviter_next(di); 2872 * 2873 * deviter_next(di): return the next device_t in the device tree, 2874 * or NULL if there are no more devices. deviter_next(di) 2875 * is undefined if `di' was not initialized with deviter_init() or 2876 * deviter_first(). 2877 * 2878 * deviter_release(di): stops iteration (subsequent calls to 2879 * deviter_next() will return NULL), releases any locks and 2880 * resources held by the device iterator. 2881 * 2882 * Device iteration does not return device_t's in any particular 2883 * order. An iterator will never return the same device_t twice. 2884 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2885 * is called repeatedly on the same `di', it will eventually return 2886 * NULL. It is ok to attach/detach devices during device iteration. 2887 */ 2888 void 2889 deviter_init(deviter_t *di, deviter_flags_t flags) 2890 { 2891 device_t dv; 2892 2893 memset(di, 0, sizeof(*di)); 2894 2895 if ((flags & DEVITER_F_SHUTDOWN) != 0) 2896 flags |= DEVITER_F_RW; 2897 2898 mutex_enter(&alldevs.lock); 2899 if ((flags & DEVITER_F_RW) != 0) 2900 alldevs.nwrite++; 2901 else 2902 alldevs.nread++; 2903 di->di_gen = alldevs.gen++; 2904 di->di_flags = flags; 2905 2906 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2907 case DEVITER_F_LEAVES_FIRST: 2908 TAILQ_FOREACH(dv, &alldevs.list, dv_list) { 2909 if (!deviter_visits(di, dv)) 2910 continue; 2911 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2912 } 2913 break; 2914 case DEVITER_F_ROOT_FIRST: 2915 TAILQ_FOREACH(dv, &alldevs.list, dv_list) { 2916 if (!deviter_visits(di, dv)) 2917 continue; 2918 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2919 } 2920 break; 2921 default: 2922 break; 2923 } 2924 2925 deviter_reinit(di); 2926 mutex_exit(&alldevs.lock); 2927 } 2928 2929 static void 2930 deviter_reinit(deviter_t *di) 2931 { 2932 2933 KASSERT(mutex_owned(&alldevs.lock)); 2934 if ((di->di_flags & DEVITER_F_RW) != 0) 2935 di->di_prev = TAILQ_LAST(&alldevs.list, devicelist); 2936 else 2937 di->di_prev = TAILQ_FIRST(&alldevs.list); 2938 } 2939 2940 device_t 2941 deviter_first(deviter_t *di, deviter_flags_t flags) 2942 { 2943 2944 deviter_init(di, flags); 2945 return deviter_next(di); 2946 } 2947 2948 static device_t 2949 deviter_next2(deviter_t *di) 2950 { 2951 device_t dv; 2952 2953 KASSERT(mutex_owned(&alldevs.lock)); 2954 2955 dv = di->di_prev; 2956 2957 if (dv == NULL) 2958 return NULL; 2959 2960 if ((di->di_flags & DEVITER_F_RW) != 0) 2961 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2962 else 2963 di->di_prev = TAILQ_NEXT(dv, dv_list); 2964 2965 return dv; 2966 } 2967 2968 static device_t 2969 deviter_next1(deviter_t *di) 2970 { 2971 device_t dv; 2972 2973 KASSERT(mutex_owned(&alldevs.lock)); 2974 2975 do { 2976 dv = deviter_next2(di); 2977 } while (dv != NULL && !deviter_visits(di, dv)); 2978 2979 return dv; 2980 } 2981 2982 device_t 2983 deviter_next(deviter_t *di) 2984 { 2985 device_t dv = NULL; 2986 2987 mutex_enter(&alldevs.lock); 2988 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2989 case 0: 2990 dv = deviter_next1(di); 2991 break; 2992 case DEVITER_F_LEAVES_FIRST: 2993 while (di->di_curdepth >= 0) { 2994 if ((dv = deviter_next1(di)) == NULL) { 2995 di->di_curdepth--; 2996 deviter_reinit(di); 2997 } else if (dv->dv_depth == di->di_curdepth) 2998 break; 2999 } 3000 break; 3001 case DEVITER_F_ROOT_FIRST: 3002 while (di->di_curdepth <= di->di_maxdepth) { 3003 if ((dv = deviter_next1(di)) == NULL) { 3004 di->di_curdepth++; 3005 deviter_reinit(di); 3006 } else if (dv->dv_depth == di->di_curdepth) 3007 break; 3008 } 3009 break; 3010 default: 3011 break; 3012 } 3013 mutex_exit(&alldevs.lock); 3014 3015 return dv; 3016 } 3017 3018 void 3019 deviter_release(deviter_t *di) 3020 { 3021 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 3022 3023 mutex_enter(&alldevs.lock); 3024 if (rw) 3025 --alldevs.nwrite; 3026 else 3027 --alldevs.nread; 3028 /* XXX wake a garbage-collection thread */ 3029 mutex_exit(&alldevs.lock); 3030 } 3031 3032 const char * 3033 cfdata_ifattr(const struct cfdata *cf) 3034 { 3035 return cf->cf_pspec->cfp_iattr; 3036 } 3037 3038 bool 3039 ifattr_match(const char *snull, const char *t) 3040 { 3041 return (snull == NULL) || strcmp(snull, t) == 0; 3042 } 3043 3044 void 3045 null_childdetached(device_t self, device_t child) 3046 { 3047 /* do nothing */ 3048 } 3049 3050 static void 3051 sysctl_detach_setup(struct sysctllog **clog) 3052 { 3053 3054 sysctl_createv(clog, 0, NULL, NULL, 3055 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 3056 CTLTYPE_BOOL, "detachall", 3057 SYSCTL_DESCR("Detach all devices at shutdown"), 3058 NULL, 0, &detachall, 0, 3059 CTL_KERN, CTL_CREATE, CTL_EOL); 3060 } 3061
Indexes created Sun Sep 28 12:09:53 GMT 2025