subr_autoconf.c revision 1.182
1 /* $NetBSD: subr_autoconf.c,v 1.182 2009/09/16 15:23:04 pooka 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 1.182 2009/09/16 15:23:04 pooka 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/malloc.h> 93 #include <sys/kmem.h> 94 #include <sys/systm.h> 95 #include <sys/kernel.h> 96 #include <sys/errno.h> 97 #include <sys/proc.h> 98 #include <sys/reboot.h> 99 #include <sys/kthread.h> 100 #include <sys/buf.h> 101 #include <sys/dirent.h> 102 #include <sys/vnode.h> 103 #include <sys/mount.h> 104 #include <sys/namei.h> 105 #include <sys/unistd.h> 106 #include <sys/fcntl.h> 107 #include <sys/lockf.h> 108 #include <sys/callout.h> 109 #include <sys/devmon.h> 110 #include <sys/cpu.h> 111 #include <sys/sysctl.h> 112 113 #include <sys/disk.h> 114 115 #include <machine/limits.h> 116 117 #if defined(__i386__) && defined(_KERNEL_OPT) 118 #include "opt_splash.h" 119 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 120 #include <dev/splash/splash.h> 121 extern struct splash_progress *splash_progress_state; 122 #endif 123 #endif 124 125 /* 126 * Autoconfiguration subroutines. 127 */ 128 129 /* 130 * ioconf.c exports exactly two names: cfdata and cfroots. All system 131 * devices and drivers are found via these tables. 132 */ 133 extern struct cfdata cfdata[]; 134 extern const short cfroots[]; 135 136 /* 137 * List of all cfdriver structures. We use this to detect duplicates 138 * when other cfdrivers are loaded. 139 */ 140 struct cfdriverlist allcfdrivers = LIST_HEAD_INITIALIZER(&allcfdrivers); 141 extern struct cfdriver * const cfdriver_list_initial[]; 142 143 /* 144 * Initial list of cfattach's. 145 */ 146 extern const struct cfattachinit cfattachinit[]; 147 148 /* 149 * List of cfdata tables. We always have one such list -- the one 150 * built statically when the kernel was configured. 151 */ 152 struct cftablelist allcftables = TAILQ_HEAD_INITIALIZER(allcftables); 153 static struct cftable initcftable; 154 155 #define ROOT ((device_t)NULL) 156 157 struct matchinfo { 158 cfsubmatch_t fn; 159 struct device *parent; 160 const int *locs; 161 void *aux; 162 struct cfdata *match; 163 int pri; 164 }; 165 166 static char *number(char *, int); 167 static void mapply(struct matchinfo *, cfdata_t); 168 static device_t config_devalloc(const device_t, const cfdata_t, const int *); 169 static void config_devdealloc(device_t); 170 static void config_makeroom(int, struct cfdriver *); 171 static void config_devlink(device_t); 172 static void config_devunlink(device_t); 173 174 static void pmflock_debug(device_t, const char *, int); 175 static void pmflock_debug_with_flags(device_t, const char *, int PMF_FN_PROTO); 176 177 static device_t deviter_next1(deviter_t *); 178 static void deviter_reinit(deviter_t *); 179 180 struct deferred_config { 181 TAILQ_ENTRY(deferred_config) dc_queue; 182 device_t dc_dev; 183 void (*dc_func)(device_t); 184 }; 185 186 TAILQ_HEAD(deferred_config_head, deferred_config); 187 188 struct deferred_config_head deferred_config_queue = 189 TAILQ_HEAD_INITIALIZER(deferred_config_queue); 190 struct deferred_config_head interrupt_config_queue = 191 TAILQ_HEAD_INITIALIZER(interrupt_config_queue); 192 int interrupt_config_threads = 8; 193 194 static void config_process_deferred(struct deferred_config_head *, device_t); 195 196 /* Hooks to finalize configuration once all real devices have been found. */ 197 struct finalize_hook { 198 TAILQ_ENTRY(finalize_hook) f_list; 199 int (*f_func)(device_t); 200 device_t f_dev; 201 }; 202 static TAILQ_HEAD(, finalize_hook) config_finalize_list = 203 TAILQ_HEAD_INITIALIZER(config_finalize_list); 204 static int config_finalize_done; 205 206 /* list of all devices */ 207 struct devicelist alldevs = TAILQ_HEAD_INITIALIZER(alldevs); 208 kcondvar_t alldevs_cv; 209 kmutex_t alldevs_mtx; 210 static int alldevs_nread = 0; 211 static int alldevs_nwrite = 0; 212 static lwp_t *alldevs_writer = NULL; 213 214 static int config_pending; /* semaphore for mountroot */ 215 static kmutex_t config_misc_lock; 216 static kcondvar_t config_misc_cv; 217 218 static int detachall = 0; 219 220 #define STREQ(s1, s2) \ 221 (*(s1) == *(s2) && strcmp((s1), (s2)) == 0) 222 223 static int config_initialized; /* config_init() has been called. */ 224 225 static int config_do_twiddle; 226 static callout_t config_twiddle_ch; 227 228 static void sysctl_detach_setup(struct sysctllog **); 229 230 /* 231 * Initialize the autoconfiguration data structures. Normally this 232 * is done by configure(), but some platforms need to do this very 233 * early (to e.g. initialize the console). 234 */ 235 void 236 config_init(void) 237 { 238 const struct cfattachinit *cfai; 239 int i, j; 240 241 if (config_initialized) 242 return; 243 244 mutex_init(&alldevs_mtx, MUTEX_DEFAULT, IPL_NONE); 245 cv_init(&alldevs_cv, "alldevs"); 246 247 mutex_init(&config_misc_lock, MUTEX_DEFAULT, IPL_NONE); 248 cv_init(&config_misc_cv, "cfgmisc"); 249 250 callout_init(&config_twiddle_ch, CALLOUT_MPSAFE); 251 252 /* allcfdrivers is statically initialized. */ 253 for (i = 0; cfdriver_list_initial[i] != NULL; i++) { 254 if (config_cfdriver_attach(cfdriver_list_initial[i]) != 0) 255 panic("configure: duplicate `%s' drivers", 256 cfdriver_list_initial[i]->cd_name); 257 } 258 259 for (cfai = &cfattachinit[0]; cfai->cfai_name != NULL; cfai++) { 260 for (j = 0; cfai->cfai_list[j] != NULL; j++) { 261 if (config_cfattach_attach(cfai->cfai_name, 262 cfai->cfai_list[j]) != 0) 263 panic("configure: duplicate `%s' attachment " 264 "of `%s' driver", 265 cfai->cfai_list[j]->ca_name, 266 cfai->cfai_name); 267 } 268 } 269 270 initcftable.ct_cfdata = cfdata; 271 TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list); 272 sysctl_detach_setup(NULL); 273 274 config_initialized = 1; 275 } 276 277 void 278 config_deferred(device_t dev) 279 { 280 config_process_deferred(&deferred_config_queue, dev); 281 config_process_deferred(&interrupt_config_queue, dev); 282 } 283 284 static void 285 config_interrupts_thread(void *cookie) 286 { 287 struct deferred_config *dc; 288 289 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 290 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 291 (*dc->dc_func)(dc->dc_dev); 292 kmem_free(dc, sizeof(*dc)); 293 config_pending_decr(); 294 } 295 kthread_exit(0); 296 } 297 298 void 299 config_create_interruptthreads() 300 { 301 int i; 302 303 for (i = 0; i < interrupt_config_threads; i++) { 304 (void)kthread_create(PRI_NONE, 0, NULL, 305 config_interrupts_thread, NULL, NULL, "config"); 306 } 307 } 308 309 /* 310 * Announce device attach/detach to userland listeners. 311 */ 312 static void 313 devmon_report_device(device_t dev, bool isattach) 314 { 315 #if NDRVCTL > 0 316 prop_dictionary_t ev; 317 const char *parent; 318 const char *what; 319 device_t pdev = device_parent(dev); 320 321 ev = prop_dictionary_create(); 322 if (ev == NULL) 323 return; 324 325 what = (isattach ? "device-attach" : "device-detach"); 326 parent = (pdev == NULL ? "root" : device_xname(pdev)); 327 if (!prop_dictionary_set_cstring(ev, "device", device_xname(dev)) || 328 !prop_dictionary_set_cstring(ev, "parent", parent)) { 329 prop_object_release(ev); 330 return; 331 } 332 333 devmon_insert(what, ev); 334 #endif 335 } 336 337 /* 338 * Add a cfdriver to the system. 339 */ 340 int 341 config_cfdriver_attach(struct cfdriver *cd) 342 { 343 struct cfdriver *lcd; 344 345 /* Make sure this driver isn't already in the system. */ 346 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 347 if (STREQ(lcd->cd_name, cd->cd_name)) 348 return EEXIST; 349 } 350 351 LIST_INIT(&cd->cd_attach); 352 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 353 354 return 0; 355 } 356 357 /* 358 * Remove a cfdriver from the system. 359 */ 360 int 361 config_cfdriver_detach(struct cfdriver *cd) 362 { 363 int i; 364 365 /* Make sure there are no active instances. */ 366 for (i = 0; i < cd->cd_ndevs; i++) { 367 if (cd->cd_devs[i] != NULL) 368 return EBUSY; 369 } 370 371 /* ...and no attachments loaded. */ 372 if (LIST_EMPTY(&cd->cd_attach) == 0) 373 return EBUSY; 374 375 LIST_REMOVE(cd, cd_list); 376 377 KASSERT(cd->cd_devs == NULL); 378 379 return 0; 380 } 381 382 /* 383 * Look up a cfdriver by name. 384 */ 385 struct cfdriver * 386 config_cfdriver_lookup(const char *name) 387 { 388 struct cfdriver *cd; 389 390 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 391 if (STREQ(cd->cd_name, name)) 392 return cd; 393 } 394 395 return NULL; 396 } 397 398 /* 399 * Add a cfattach to the specified driver. 400 */ 401 int 402 config_cfattach_attach(const char *driver, struct cfattach *ca) 403 { 404 struct cfattach *lca; 405 struct cfdriver *cd; 406 407 cd = config_cfdriver_lookup(driver); 408 if (cd == NULL) 409 return ESRCH; 410 411 /* Make sure this attachment isn't already on this driver. */ 412 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 413 if (STREQ(lca->ca_name, ca->ca_name)) 414 return EEXIST; 415 } 416 417 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 418 419 return 0; 420 } 421 422 /* 423 * Remove a cfattach from the specified driver. 424 */ 425 int 426 config_cfattach_detach(const char *driver, struct cfattach *ca) 427 { 428 struct cfdriver *cd; 429 device_t dev; 430 int i; 431 432 cd = config_cfdriver_lookup(driver); 433 if (cd == NULL) 434 return ESRCH; 435 436 /* Make sure there are no active instances. */ 437 for (i = 0; i < cd->cd_ndevs; i++) { 438 if ((dev = cd->cd_devs[i]) == NULL) 439 continue; 440 if (dev->dv_cfattach == ca) 441 return EBUSY; 442 } 443 444 LIST_REMOVE(ca, ca_list); 445 446 return 0; 447 } 448 449 /* 450 * Look up a cfattach by name. 451 */ 452 static struct cfattach * 453 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 454 { 455 struct cfattach *ca; 456 457 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 458 if (STREQ(ca->ca_name, atname)) 459 return ca; 460 } 461 462 return NULL; 463 } 464 465 /* 466 * Look up a cfattach by driver/attachment name. 467 */ 468 struct cfattach * 469 config_cfattach_lookup(const char *name, const char *atname) 470 { 471 struct cfdriver *cd; 472 473 cd = config_cfdriver_lookup(name); 474 if (cd == NULL) 475 return NULL; 476 477 return config_cfattach_lookup_cd(cd, atname); 478 } 479 480 /* 481 * Apply the matching function and choose the best. This is used 482 * a few times and we want to keep the code small. 483 */ 484 static void 485 mapply(struct matchinfo *m, cfdata_t cf) 486 { 487 int pri; 488 489 if (m->fn != NULL) { 490 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 491 } else { 492 pri = config_match(m->parent, cf, m->aux); 493 } 494 if (pri > m->pri) { 495 m->match = cf; 496 m->pri = pri; 497 } 498 } 499 500 int 501 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 502 { 503 const struct cfiattrdata *ci; 504 const struct cflocdesc *cl; 505 int nlocs, i; 506 507 ci = cfiattr_lookup(cf->cf_pspec->cfp_iattr, parent->dv_cfdriver); 508 KASSERT(ci); 509 nlocs = ci->ci_loclen; 510 KASSERT(!nlocs || locs); 511 for (i = 0; i < nlocs; i++) { 512 cl = &ci->ci_locdesc[i]; 513 /* !cld_defaultstr means no default value */ 514 if ((!(cl->cld_defaultstr) 515 || (cf->cf_loc[i] != cl->cld_default)) 516 && cf->cf_loc[i] != locs[i]) 517 return 0; 518 } 519 520 return config_match(parent, cf, aux); 521 } 522 523 /* 524 * Helper function: check whether the driver supports the interface attribute 525 * and return its descriptor structure. 526 */ 527 static const struct cfiattrdata * 528 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 529 { 530 const struct cfiattrdata * const *cpp; 531 532 if (cd->cd_attrs == NULL) 533 return 0; 534 535 for (cpp = cd->cd_attrs; *cpp; cpp++) { 536 if (STREQ((*cpp)->ci_name, ia)) { 537 /* Match. */ 538 return *cpp; 539 } 540 } 541 return 0; 542 } 543 544 /* 545 * Lookup an interface attribute description by name. 546 * If the driver is given, consider only its supported attributes. 547 */ 548 const struct cfiattrdata * 549 cfiattr_lookup(const char *name, const struct cfdriver *cd) 550 { 551 const struct cfdriver *d; 552 const struct cfiattrdata *ia; 553 554 if (cd) 555 return cfdriver_get_iattr(cd, name); 556 557 LIST_FOREACH(d, &allcfdrivers, cd_list) { 558 ia = cfdriver_get_iattr(d, name); 559 if (ia) 560 return ia; 561 } 562 return 0; 563 } 564 565 /* 566 * Determine if `parent' is a potential parent for a device spec based 567 * on `cfp'. 568 */ 569 static int 570 cfparent_match(const device_t parent, const struct cfparent *cfp) 571 { 572 struct cfdriver *pcd; 573 574 /* We don't match root nodes here. */ 575 if (cfp == NULL) 576 return 0; 577 578 pcd = parent->dv_cfdriver; 579 KASSERT(pcd != NULL); 580 581 /* 582 * First, ensure this parent has the correct interface 583 * attribute. 584 */ 585 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 586 return 0; 587 588 /* 589 * If no specific parent device instance was specified (i.e. 590 * we're attaching to the attribute only), we're done! 591 */ 592 if (cfp->cfp_parent == NULL) 593 return 1; 594 595 /* 596 * Check the parent device's name. 597 */ 598 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 599 return 0; /* not the same parent */ 600 601 /* 602 * Make sure the unit number matches. 603 */ 604 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 605 cfp->cfp_unit == parent->dv_unit) 606 return 1; 607 608 /* Unit numbers don't match. */ 609 return 0; 610 } 611 612 /* 613 * Helper for config_cfdata_attach(): check all devices whether it could be 614 * parent any attachment in the config data table passed, and rescan. 615 */ 616 static void 617 rescan_with_cfdata(const struct cfdata *cf) 618 { 619 device_t d; 620 const struct cfdata *cf1; 621 deviter_t di; 622 623 624 /* 625 * "alldevs" is likely longer than a modules's cfdata, so make it 626 * the outer loop. 627 */ 628 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 629 630 if (!(d->dv_cfattach->ca_rescan)) 631 continue; 632 633 for (cf1 = cf; cf1->cf_name; cf1++) { 634 635 if (!cfparent_match(d, cf1->cf_pspec)) 636 continue; 637 638 (*d->dv_cfattach->ca_rescan)(d, 639 cf1->cf_pspec->cfp_iattr, cf1->cf_loc); 640 } 641 } 642 deviter_release(&di); 643 } 644 645 /* 646 * Attach a supplemental config data table and rescan potential 647 * parent devices if required. 648 */ 649 int 650 config_cfdata_attach(cfdata_t cf, int scannow) 651 { 652 struct cftable *ct; 653 654 ct = kmem_alloc(sizeof(*ct), KM_SLEEP); 655 ct->ct_cfdata = cf; 656 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 657 658 if (scannow) 659 rescan_with_cfdata(cf); 660 661 return 0; 662 } 663 664 /* 665 * Helper for config_cfdata_detach: check whether a device is 666 * found through any attachment in the config data table. 667 */ 668 static int 669 dev_in_cfdata(const struct device *d, const struct cfdata *cf) 670 { 671 const struct cfdata *cf1; 672 673 for (cf1 = cf; cf1->cf_name; cf1++) 674 if (d->dv_cfdata == cf1) 675 return 1; 676 677 return 0; 678 } 679 680 /* 681 * Detach a supplemental config data table. Detach all devices found 682 * through that table (and thus keeping references to it) before. 683 */ 684 int 685 config_cfdata_detach(cfdata_t cf) 686 { 687 device_t d; 688 int error = 0; 689 struct cftable *ct; 690 deviter_t di; 691 692 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 693 d = deviter_next(&di)) { 694 if (!dev_in_cfdata(d, cf)) 695 continue; 696 if ((error = config_detach(d, 0)) != 0) 697 break; 698 } 699 deviter_release(&di); 700 if (error) { 701 aprint_error_dev(d, "unable to detach instance\n"); 702 return error; 703 } 704 705 TAILQ_FOREACH(ct, &allcftables, ct_list) { 706 if (ct->ct_cfdata == cf) { 707 TAILQ_REMOVE(&allcftables, ct, ct_list); 708 kmem_free(ct, sizeof(*ct)); 709 return 0; 710 } 711 } 712 713 /* not found -- shouldn't happen */ 714 return EINVAL; 715 } 716 717 /* 718 * Invoke the "match" routine for a cfdata entry on behalf of 719 * an external caller, usually a "submatch" routine. 720 */ 721 int 722 config_match(device_t parent, cfdata_t cf, void *aux) 723 { 724 struct cfattach *ca; 725 726 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 727 if (ca == NULL) { 728 /* No attachment for this entry, oh well. */ 729 return 0; 730 } 731 732 return (*ca->ca_match)(parent, cf, aux); 733 } 734 735 /* 736 * Iterate over all potential children of some device, calling the given 737 * function (default being the child's match function) for each one. 738 * Nonzero returns are matches; the highest value returned is considered 739 * the best match. Return the `found child' if we got a match, or NULL 740 * otherwise. The `aux' pointer is simply passed on through. 741 * 742 * Note that this function is designed so that it can be used to apply 743 * an arbitrary function to all potential children (its return value 744 * can be ignored). 745 */ 746 cfdata_t 747 config_search_loc(cfsubmatch_t fn, device_t parent, 748 const char *ifattr, const int *locs, void *aux) 749 { 750 struct cftable *ct; 751 cfdata_t cf; 752 struct matchinfo m; 753 754 KASSERT(config_initialized); 755 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 756 757 m.fn = fn; 758 m.parent = parent; 759 m.locs = locs; 760 m.aux = aux; 761 m.match = NULL; 762 m.pri = 0; 763 764 TAILQ_FOREACH(ct, &allcftables, ct_list) { 765 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 766 767 /* We don't match root nodes here. */ 768 if (!cf->cf_pspec) 769 continue; 770 771 /* 772 * Skip cf if no longer eligible, otherwise scan 773 * through parents for one matching `parent', and 774 * try match function. 775 */ 776 if (cf->cf_fstate == FSTATE_FOUND) 777 continue; 778 if (cf->cf_fstate == FSTATE_DNOTFOUND || 779 cf->cf_fstate == FSTATE_DSTAR) 780 continue; 781 782 /* 783 * If an interface attribute was specified, 784 * consider only children which attach to 785 * that attribute. 786 */ 787 if (ifattr && !STREQ(ifattr, cf->cf_pspec->cfp_iattr)) 788 continue; 789 790 if (cfparent_match(parent, cf->cf_pspec)) 791 mapply(&m, cf); 792 } 793 } 794 return m.match; 795 } 796 797 cfdata_t 798 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 799 void *aux) 800 { 801 802 return config_search_loc(fn, parent, ifattr, NULL, aux); 803 } 804 805 /* 806 * Find the given root device. 807 * This is much like config_search, but there is no parent. 808 * Don't bother with multiple cfdata tables; the root node 809 * must always be in the initial table. 810 */ 811 cfdata_t 812 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 813 { 814 cfdata_t cf; 815 const short *p; 816 struct matchinfo m; 817 818 m.fn = fn; 819 m.parent = ROOT; 820 m.aux = aux; 821 m.match = NULL; 822 m.pri = 0; 823 m.locs = 0; 824 /* 825 * Look at root entries for matching name. We do not bother 826 * with found-state here since only one root should ever be 827 * searched (and it must be done first). 828 */ 829 for (p = cfroots; *p >= 0; p++) { 830 cf = &cfdata[*p]; 831 if (strcmp(cf->cf_name, rootname) == 0) 832 mapply(&m, cf); 833 } 834 return m.match; 835 } 836 837 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 838 839 /* 840 * The given `aux' argument describes a device that has been found 841 * on the given parent, but not necessarily configured. Locate the 842 * configuration data for that device (using the submatch function 843 * provided, or using candidates' cd_match configuration driver 844 * functions) and attach it, and return true. If the device was 845 * not configured, call the given `print' function and return 0. 846 */ 847 device_t 848 config_found_sm_loc(device_t parent, 849 const char *ifattr, const int *locs, void *aux, 850 cfprint_t print, cfsubmatch_t submatch) 851 { 852 cfdata_t cf; 853 854 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 855 if (splash_progress_state) 856 splash_progress_update(splash_progress_state); 857 #endif 858 859 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 860 return(config_attach_loc(parent, cf, locs, aux, print)); 861 if (print) { 862 if (config_do_twiddle && cold) 863 twiddle(); 864 aprint_normal("%s", msgs[(*print)(aux, device_xname(parent))]); 865 } 866 867 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 868 if (splash_progress_state) 869 splash_progress_update(splash_progress_state); 870 #endif 871 872 return NULL; 873 } 874 875 device_t 876 config_found_ia(device_t parent, const char *ifattr, void *aux, 877 cfprint_t print) 878 { 879 880 return config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL); 881 } 882 883 device_t 884 config_found(device_t parent, void *aux, cfprint_t print) 885 { 886 887 return config_found_sm_loc(parent, NULL, NULL, aux, print, NULL); 888 } 889 890 /* 891 * As above, but for root devices. 892 */ 893 device_t 894 config_rootfound(const char *rootname, void *aux) 895 { 896 cfdata_t cf; 897 898 if ((cf = config_rootsearch((cfsubmatch_t)NULL, rootname, aux)) != NULL) 899 return config_attach(ROOT, cf, aux, (cfprint_t)NULL); 900 aprint_error("root device %s not configured\n", rootname); 901 return NULL; 902 } 903 904 /* just like sprintf(buf, "%d") except that it works from the end */ 905 static char * 906 number(char *ep, int n) 907 { 908 909 *--ep = 0; 910 while (n >= 10) { 911 *--ep = (n % 10) + '0'; 912 n /= 10; 913 } 914 *--ep = n + '0'; 915 return ep; 916 } 917 918 /* 919 * Expand the size of the cd_devs array if necessary. 920 */ 921 static void 922 config_makeroom(int n, struct cfdriver *cd) 923 { 924 int old, new; 925 device_t *nsp; 926 927 if (n < cd->cd_ndevs) 928 return; 929 930 /* 931 * Need to expand the array. 932 */ 933 old = cd->cd_ndevs; 934 if (old == 0) 935 new = 4; 936 else 937 new = old * 2; 938 while (new <= n) 939 new *= 2; 940 cd->cd_ndevs = new; 941 nsp = kmem_alloc(sizeof(device_t [new]), KM_SLEEP); 942 if (nsp == NULL) 943 panic("config_attach: %sing dev array", 944 old != 0 ? "expand" : "creat"); 945 memset(nsp + old, 0, sizeof(device_t [new - old])); 946 if (old != 0) { 947 memcpy(nsp, cd->cd_devs, sizeof(device_t [old])); 948 kmem_free(cd->cd_devs, sizeof(device_t [old])); 949 } 950 cd->cd_devs = nsp; 951 } 952 953 static void 954 config_devlink(device_t dev) 955 { 956 struct cfdriver *cd = dev->dv_cfdriver; 957 958 /* put this device in the devices array */ 959 config_makeroom(dev->dv_unit, cd); 960 if (cd->cd_devs[dev->dv_unit]) 961 panic("config_attach: duplicate %s", device_xname(dev)); 962 cd->cd_devs[dev->dv_unit] = dev; 963 964 /* It is safe to add a device to the tail of the list while 965 * readers are in the list, but not while a writer is in 966 * the list. Wait for any writer to complete. 967 */ 968 mutex_enter(&alldevs_mtx); 969 while (alldevs_nwrite != 0 && alldevs_writer != curlwp) 970 cv_wait(&alldevs_cv, &alldevs_mtx); 971 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); /* link up */ 972 cv_signal(&alldevs_cv); 973 mutex_exit(&alldevs_mtx); 974 } 975 976 static void 977 config_devunlink(device_t dev) 978 { 979 struct cfdriver *cd = dev->dv_cfdriver; 980 int i; 981 982 /* Unlink from device list. */ 983 TAILQ_REMOVE(&alldevs, dev, dv_list); 984 985 /* Remove from cfdriver's array. */ 986 cd->cd_devs[dev->dv_unit] = NULL; 987 988 /* 989 * If the device now has no units in use, deallocate its softc array. 990 */ 991 for (i = 0; i < cd->cd_ndevs; i++) { 992 if (cd->cd_devs[i] != NULL) 993 return; 994 } 995 /* nothing found; deallocate */ 996 kmem_free(cd->cd_devs, sizeof(device_t [cd->cd_ndevs])); 997 cd->cd_devs = NULL; 998 cd->cd_ndevs = 0; 999 } 1000 1001 static device_t 1002 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1003 { 1004 struct cfdriver *cd; 1005 struct cfattach *ca; 1006 size_t lname, lunit; 1007 const char *xunit; 1008 int myunit; 1009 char num[10]; 1010 device_t dev; 1011 void *dev_private; 1012 const struct cfiattrdata *ia; 1013 device_lock_t dvl; 1014 1015 cd = config_cfdriver_lookup(cf->cf_name); 1016 if (cd == NULL) 1017 return NULL; 1018 1019 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1020 if (ca == NULL) 1021 return NULL; 1022 1023 if ((ca->ca_flags & DVF_PRIV_ALLOC) == 0 && 1024 ca->ca_devsize < sizeof(struct device)) 1025 panic("config_devalloc: %s", cf->cf_atname); 1026 1027 #ifndef __BROKEN_CONFIG_UNIT_USAGE 1028 if (cf->cf_fstate == FSTATE_STAR) { 1029 for (myunit = cf->cf_unit; myunit < cd->cd_ndevs; myunit++) 1030 if (cd->cd_devs[myunit] == NULL) 1031 break; 1032 /* 1033 * myunit is now the unit of the first NULL device pointer, 1034 * or max(cd->cd_ndevs,cf->cf_unit). 1035 */ 1036 } else { 1037 myunit = cf->cf_unit; 1038 if (myunit < cd->cd_ndevs && cd->cd_devs[myunit] != NULL) 1039 return NULL; 1040 } 1041 #else 1042 myunit = cf->cf_unit; 1043 #endif /* ! __BROKEN_CONFIG_UNIT_USAGE */ 1044 1045 /* compute length of name and decimal expansion of unit number */ 1046 lname = strlen(cd->cd_name); 1047 xunit = number(&num[sizeof(num)], myunit); 1048 lunit = &num[sizeof(num)] - xunit; 1049 if (lname + lunit > sizeof(dev->dv_xname)) 1050 panic("config_devalloc: device name too long"); 1051 1052 /* get memory for all device vars */ 1053 KASSERT((ca->ca_flags & DVF_PRIV_ALLOC) || ca->ca_devsize >= sizeof(struct device)); 1054 if (ca->ca_devsize > 0) { 1055 dev_private = kmem_zalloc(ca->ca_devsize, KM_SLEEP); 1056 if (dev_private == NULL) 1057 panic("config_devalloc: memory allocation for device softc failed"); 1058 } else { 1059 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1060 dev_private = NULL; 1061 } 1062 1063 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1064 dev = kmem_zalloc(sizeof(*dev), KM_SLEEP); 1065 } else { 1066 dev = dev_private; 1067 } 1068 if (dev == NULL) 1069 panic("config_devalloc: memory allocation for device_t failed"); 1070 1071 dvl = device_getlock(dev); 1072 1073 mutex_init(&dvl->dvl_mtx, MUTEX_DEFAULT, IPL_NONE); 1074 cv_init(&dvl->dvl_cv, "pmfsusp"); 1075 1076 dev->dv_class = cd->cd_class; 1077 dev->dv_cfdata = cf; 1078 dev->dv_cfdriver = cd; 1079 dev->dv_cfattach = ca; 1080 dev->dv_unit = myunit; 1081 dev->dv_activity_count = 0; 1082 dev->dv_activity_handlers = NULL; 1083 dev->dv_private = dev_private; 1084 memcpy(dev->dv_xname, cd->cd_name, lname); 1085 memcpy(dev->dv_xname + lname, xunit, lunit); 1086 dev->dv_parent = parent; 1087 if (parent != NULL) 1088 dev->dv_depth = parent->dv_depth + 1; 1089 else 1090 dev->dv_depth = 0; 1091 dev->dv_flags = DVF_ACTIVE; /* always initially active */ 1092 dev->dv_flags |= ca->ca_flags; /* inherit flags from class */ 1093 if (locs) { 1094 KASSERT(parent); /* no locators at root */ 1095 ia = cfiattr_lookup(cf->cf_pspec->cfp_iattr, 1096 parent->dv_cfdriver); 1097 dev->dv_locators = 1098 kmem_alloc(sizeof(int [ia->ci_loclen + 1]), KM_SLEEP); 1099 *dev->dv_locators++ = sizeof(int [ia->ci_loclen + 1]); 1100 memcpy(dev->dv_locators, locs, sizeof(int [ia->ci_loclen])); 1101 } 1102 dev->dv_properties = prop_dictionary_create(); 1103 KASSERT(dev->dv_properties != NULL); 1104 1105 prop_dictionary_set_cstring_nocopy(dev->dv_properties, 1106 "device-driver", dev->dv_cfdriver->cd_name); 1107 prop_dictionary_set_uint16(dev->dv_properties, 1108 "device-unit", dev->dv_unit); 1109 1110 return dev; 1111 } 1112 1113 static void 1114 config_devdealloc(device_t dev) 1115 { 1116 device_lock_t dvl = device_getlock(dev); 1117 int priv = (dev->dv_flags & DVF_PRIV_ALLOC); 1118 1119 cv_destroy(&dvl->dvl_cv); 1120 mutex_destroy(&dvl->dvl_mtx); 1121 1122 KASSERT(dev->dv_properties != NULL); 1123 prop_object_release(dev->dv_properties); 1124 1125 if (dev->dv_activity_handlers) 1126 panic("config_devdealloc with registered handlers"); 1127 1128 if (dev->dv_locators) { 1129 size_t amount = *--dev->dv_locators; 1130 kmem_free(dev->dv_locators, amount); 1131 } 1132 1133 if (dev->dv_cfattach->ca_devsize > 0) 1134 kmem_free(dev->dv_private, dev->dv_cfattach->ca_devsize); 1135 if (priv) 1136 kmem_free(dev, sizeof(*dev)); 1137 } 1138 1139 /* 1140 * Attach a found device. 1141 */ 1142 device_t 1143 config_attach_loc(device_t parent, cfdata_t cf, 1144 const int *locs, void *aux, cfprint_t print) 1145 { 1146 device_t dev; 1147 struct cftable *ct; 1148 const char *drvname; 1149 1150 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1151 if (splash_progress_state) 1152 splash_progress_update(splash_progress_state); 1153 #endif 1154 1155 dev = config_devalloc(parent, cf, locs); 1156 if (!dev) 1157 panic("config_attach: allocation of device softc failed"); 1158 1159 /* XXX redundant - see below? */ 1160 if (cf->cf_fstate != FSTATE_STAR) { 1161 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1162 cf->cf_fstate = FSTATE_FOUND; 1163 } 1164 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1165 else 1166 cf->cf_unit++; 1167 #endif 1168 1169 config_devlink(dev); 1170 1171 if (config_do_twiddle && cold) 1172 twiddle(); 1173 else 1174 aprint_naive("Found "); 1175 /* 1176 * We want the next two printfs for normal, verbose, and quiet, 1177 * but not silent (in which case, we're twiddling, instead). 1178 */ 1179 if (parent == ROOT) { 1180 aprint_naive("%s (root)", device_xname(dev)); 1181 aprint_normal("%s (root)", device_xname(dev)); 1182 } else { 1183 aprint_naive("%s at %s", device_xname(dev), device_xname(parent)); 1184 aprint_normal("%s at %s", device_xname(dev), device_xname(parent)); 1185 if (print) 1186 (void) (*print)(aux, NULL); 1187 } 1188 1189 /* 1190 * Before attaching, clobber any unfound devices that are 1191 * otherwise identical. 1192 * XXX code above is redundant? 1193 */ 1194 drvname = dev->dv_cfdriver->cd_name; 1195 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1196 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1197 if (STREQ(cf->cf_name, drvname) && 1198 cf->cf_unit == dev->dv_unit) { 1199 if (cf->cf_fstate == FSTATE_NOTFOUND) 1200 cf->cf_fstate = FSTATE_FOUND; 1201 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1202 /* 1203 * Bump the unit number on all starred cfdata 1204 * entries for this device. 1205 */ 1206 if (cf->cf_fstate == FSTATE_STAR) 1207 cf->cf_unit++; 1208 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 1209 } 1210 } 1211 } 1212 #ifdef __HAVE_DEVICE_REGISTER 1213 device_register(dev, aux); 1214 #endif 1215 1216 /* Let userland know */ 1217 devmon_report_device(dev, true); 1218 1219 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1220 if (splash_progress_state) 1221 splash_progress_update(splash_progress_state); 1222 #endif 1223 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1224 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1225 if (splash_progress_state) 1226 splash_progress_update(splash_progress_state); 1227 #endif 1228 1229 if (!device_pmf_is_registered(dev)) 1230 aprint_debug_dev(dev, "WARNING: power management not supported\n"); 1231 1232 config_process_deferred(&deferred_config_queue, dev); 1233 return dev; 1234 } 1235 1236 device_t 1237 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1238 { 1239 1240 return config_attach_loc(parent, cf, NULL, aux, print); 1241 } 1242 1243 /* 1244 * As above, but for pseudo-devices. Pseudo-devices attached in this 1245 * way are silently inserted into the device tree, and their children 1246 * attached. 1247 * 1248 * Note that because pseudo-devices are attached silently, any information 1249 * the attach routine wishes to print should be prefixed with the device 1250 * name by the attach routine. 1251 */ 1252 device_t 1253 config_attach_pseudo(cfdata_t cf) 1254 { 1255 device_t dev; 1256 1257 dev = config_devalloc(ROOT, cf, NULL); 1258 if (!dev) 1259 return NULL; 1260 1261 /* XXX mark busy in cfdata */ 1262 1263 if (cf->cf_fstate != FSTATE_STAR) { 1264 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1265 cf->cf_fstate = FSTATE_FOUND; 1266 } 1267 1268 config_devlink(dev); 1269 1270 #if 0 /* XXXJRT not yet */ 1271 #ifdef __HAVE_DEVICE_REGISTER 1272 device_register(dev, NULL); /* like a root node */ 1273 #endif 1274 #endif 1275 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1276 config_process_deferred(&deferred_config_queue, dev); 1277 return dev; 1278 } 1279 1280 /* 1281 * Detach a device. Optionally forced (e.g. because of hardware 1282 * removal) and quiet. Returns zero if successful, non-zero 1283 * (an error code) otherwise. 1284 * 1285 * Note that this code wants to be run from a process context, so 1286 * that the detach can sleep to allow processes which have a device 1287 * open to run and unwind their stacks. 1288 */ 1289 int 1290 config_detach(device_t dev, int flags) 1291 { 1292 struct cftable *ct; 1293 cfdata_t cf; 1294 const struct cfattach *ca; 1295 struct cfdriver *cd; 1296 #ifdef DIAGNOSTIC 1297 device_t d; 1298 #endif 1299 int rv = 0; 1300 1301 #ifdef DIAGNOSTIC 1302 cf = dev->dv_cfdata; 1303 if (cf != NULL && cf->cf_fstate != FSTATE_FOUND && 1304 cf->cf_fstate != FSTATE_STAR) 1305 panic("config_detach: %s: bad device fstate %d", 1306 device_xname(dev), cf ? cf->cf_fstate : -1); 1307 #endif 1308 cd = dev->dv_cfdriver; 1309 KASSERT(cd != NULL); 1310 1311 ca = dev->dv_cfattach; 1312 KASSERT(ca != NULL); 1313 1314 KASSERT(curlwp != NULL); 1315 mutex_enter(&alldevs_mtx); 1316 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 1317 ; 1318 else while (alldevs_nread != 0 || 1319 (alldevs_nwrite != 0 && alldevs_writer != curlwp)) 1320 cv_wait(&alldevs_cv, &alldevs_mtx); 1321 if (alldevs_nwrite++ == 0) 1322 alldevs_writer = curlwp; 1323 mutex_exit(&alldevs_mtx); 1324 1325 /* 1326 * Ensure the device is deactivated. If the device doesn't 1327 * have an activation entry point, we allow DVF_ACTIVE to 1328 * remain set. Otherwise, if DVF_ACTIVE is still set, the 1329 * device is busy, and the detach fails. 1330 */ 1331 if (!detachall && 1332 (flags & (DETACH_SHUTDOWN|DETACH_FORCE)) == DETACH_SHUTDOWN && 1333 (dev->dv_flags & DVF_DETACH_SHUTDOWN) == 0) { 1334 rv = EBUSY; /* XXX EOPNOTSUPP? */ 1335 } else if ((rv = config_deactivate(dev)) == EOPNOTSUPP) 1336 rv = 0; /* Do not treat EOPNOTSUPP as an error */ 1337 1338 /* 1339 * Try to detach the device. If that's not possible, then 1340 * we either panic() (for the forced but failed case), or 1341 * return an error. 1342 */ 1343 if (rv == 0) { 1344 if (ca->ca_detach != NULL) 1345 rv = (*ca->ca_detach)(dev, flags); 1346 else 1347 rv = EOPNOTSUPP; 1348 } 1349 if (rv != 0) { 1350 if ((flags & DETACH_FORCE) == 0) 1351 goto out; 1352 else 1353 panic("config_detach: forced detach of %s failed (%d)", 1354 device_xname(dev), rv); 1355 } 1356 1357 dev->dv_flags &= ~DVF_ACTIVE; 1358 1359 /* 1360 * The device has now been successfully detached. 1361 */ 1362 1363 /* Let userland know */ 1364 devmon_report_device(dev, false); 1365 1366 #ifdef DIAGNOSTIC 1367 /* 1368 * Sanity: If you're successfully detached, you should have no 1369 * children. (Note that because children must be attached 1370 * after parents, we only need to search the latter part of 1371 * the list.) 1372 */ 1373 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1374 d = TAILQ_NEXT(d, dv_list)) { 1375 if (d->dv_parent == dev) { 1376 printf("config_detach: detached device %s" 1377 " has children %s\n", device_xname(dev), device_xname(d)); 1378 panic("config_detach"); 1379 } 1380 } 1381 #endif 1382 1383 /* notify the parent that the child is gone */ 1384 if (dev->dv_parent) { 1385 device_t p = dev->dv_parent; 1386 if (p->dv_cfattach->ca_childdetached) 1387 (*p->dv_cfattach->ca_childdetached)(p, dev); 1388 } 1389 1390 /* 1391 * Mark cfdata to show that the unit can be reused, if possible. 1392 */ 1393 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1394 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1395 if (STREQ(cf->cf_name, cd->cd_name)) { 1396 if (cf->cf_fstate == FSTATE_FOUND && 1397 cf->cf_unit == dev->dv_unit) 1398 cf->cf_fstate = FSTATE_NOTFOUND; 1399 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1400 /* 1401 * Note that we can only re-use a starred 1402 * unit number if the unit being detached 1403 * had the last assigned unit number. 1404 */ 1405 if (cf->cf_fstate == FSTATE_STAR && 1406 cf->cf_unit == dev->dv_unit + 1) 1407 cf->cf_unit--; 1408 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 1409 } 1410 } 1411 } 1412 1413 config_devunlink(dev); 1414 1415 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1416 aprint_normal_dev(dev, "detached\n"); 1417 1418 config_devdealloc(dev); 1419 1420 out: 1421 mutex_enter(&alldevs_mtx); 1422 KASSERT(alldevs_nwrite != 0); 1423 if (--alldevs_nwrite == 0) 1424 alldevs_writer = NULL; 1425 cv_signal(&alldevs_cv); 1426 mutex_exit(&alldevs_mtx); 1427 return rv; 1428 } 1429 1430 int 1431 config_detach_children(device_t parent, int flags) 1432 { 1433 device_t dv; 1434 deviter_t di; 1435 int error = 0; 1436 1437 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1438 dv = deviter_next(&di)) { 1439 if (device_parent(dv) != parent) 1440 continue; 1441 if ((error = config_detach(dv, flags)) != 0) 1442 break; 1443 } 1444 deviter_release(&di); 1445 return error; 1446 } 1447 1448 device_t 1449 shutdown_first(struct shutdown_state *s) 1450 { 1451 if (!s->initialized) { 1452 deviter_init(&s->di, DEVITER_F_SHUTDOWN|DEVITER_F_LEAVES_FIRST); 1453 s->initialized = true; 1454 } 1455 return shutdown_next(s); 1456 } 1457 1458 device_t 1459 shutdown_next(struct shutdown_state *s) 1460 { 1461 device_t dv; 1462 1463 while ((dv = deviter_next(&s->di)) != NULL && !device_is_active(dv)) 1464 ; 1465 1466 if (dv == NULL) 1467 s->initialized = false; 1468 1469 return dv; 1470 } 1471 1472 bool 1473 config_detach_all(int how) 1474 { 1475 static struct shutdown_state s; 1476 device_t curdev; 1477 bool progress = false; 1478 1479 if ((how & RB_NOSYNC) != 0) 1480 return false; 1481 1482 for (curdev = shutdown_first(&s); curdev != NULL; 1483 curdev = shutdown_next(&s)) { 1484 aprint_debug(" detaching %s, ", device_xname(curdev)); 1485 if (config_detach(curdev, DETACH_SHUTDOWN) == 0) { 1486 progress = true; 1487 aprint_debug("success."); 1488 } else 1489 aprint_debug("failed."); 1490 } 1491 return progress; 1492 } 1493 1494 int 1495 config_activate(device_t dev) 1496 { 1497 const struct cfattach *ca = dev->dv_cfattach; 1498 int rv = 0, oflags = dev->dv_flags; 1499 1500 if (ca->ca_activate == NULL) 1501 return EOPNOTSUPP; 1502 1503 if ((dev->dv_flags & DVF_ACTIVE) == 0) { 1504 dev->dv_flags |= DVF_ACTIVE; 1505 rv = (*ca->ca_activate)(dev, DVACT_ACTIVATE); 1506 if (rv) 1507 dev->dv_flags = oflags; 1508 } 1509 return rv; 1510 } 1511 1512 int 1513 config_deactivate(device_t dev) 1514 { 1515 const struct cfattach *ca = dev->dv_cfattach; 1516 int rv = 0, oflags = dev->dv_flags; 1517 1518 if (ca->ca_activate == NULL) 1519 return EOPNOTSUPP; 1520 1521 if (dev->dv_flags & DVF_ACTIVE) { 1522 dev->dv_flags &= ~DVF_ACTIVE; 1523 rv = (*ca->ca_activate)(dev, DVACT_DEACTIVATE); 1524 if (rv) 1525 dev->dv_flags = oflags; 1526 } 1527 return rv; 1528 } 1529 1530 /* 1531 * Defer the configuration of the specified device until all 1532 * of its parent's devices have been attached. 1533 */ 1534 void 1535 config_defer(device_t dev, void (*func)(device_t)) 1536 { 1537 struct deferred_config *dc; 1538 1539 if (dev->dv_parent == NULL) 1540 panic("config_defer: can't defer config of a root device"); 1541 1542 #ifdef DIAGNOSTIC 1543 for (dc = TAILQ_FIRST(&deferred_config_queue); dc != NULL; 1544 dc = TAILQ_NEXT(dc, dc_queue)) { 1545 if (dc->dc_dev == dev) 1546 panic("config_defer: deferred twice"); 1547 } 1548 #endif 1549 1550 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1551 if (dc == NULL) 1552 panic("config_defer: unable to allocate callback"); 1553 1554 dc->dc_dev = dev; 1555 dc->dc_func = func; 1556 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1557 config_pending_incr(); 1558 } 1559 1560 /* 1561 * Defer some autoconfiguration for a device until after interrupts 1562 * are enabled. 1563 */ 1564 void 1565 config_interrupts(device_t dev, void (*func)(device_t)) 1566 { 1567 struct deferred_config *dc; 1568 1569 /* 1570 * If interrupts are enabled, callback now. 1571 */ 1572 if (cold == 0) { 1573 (*func)(dev); 1574 return; 1575 } 1576 1577 #ifdef DIAGNOSTIC 1578 for (dc = TAILQ_FIRST(&interrupt_config_queue); dc != NULL; 1579 dc = TAILQ_NEXT(dc, dc_queue)) { 1580 if (dc->dc_dev == dev) 1581 panic("config_interrupts: deferred twice"); 1582 } 1583 #endif 1584 1585 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1586 if (dc == NULL) 1587 panic("config_interrupts: unable to allocate callback"); 1588 1589 dc->dc_dev = dev; 1590 dc->dc_func = func; 1591 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 1592 config_pending_incr(); 1593 } 1594 1595 /* 1596 * Process a deferred configuration queue. 1597 */ 1598 static void 1599 config_process_deferred(struct deferred_config_head *queue, 1600 device_t parent) 1601 { 1602 struct deferred_config *dc, *ndc; 1603 1604 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 1605 ndc = TAILQ_NEXT(dc, dc_queue); 1606 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 1607 TAILQ_REMOVE(queue, dc, dc_queue); 1608 (*dc->dc_func)(dc->dc_dev); 1609 kmem_free(dc, sizeof(*dc)); 1610 config_pending_decr(); 1611 } 1612 } 1613 } 1614 1615 /* 1616 * Manipulate the config_pending semaphore. 1617 */ 1618 void 1619 config_pending_incr(void) 1620 { 1621 1622 mutex_enter(&config_misc_lock); 1623 config_pending++; 1624 mutex_exit(&config_misc_lock); 1625 } 1626 1627 void 1628 config_pending_decr(void) 1629 { 1630 1631 #ifdef DIAGNOSTIC 1632 if (config_pending == 0) 1633 panic("config_pending_decr: config_pending == 0"); 1634 #endif 1635 mutex_enter(&config_misc_lock); 1636 config_pending--; 1637 if (config_pending == 0) 1638 cv_broadcast(&config_misc_cv); 1639 mutex_exit(&config_misc_lock); 1640 } 1641 1642 /* 1643 * Register a "finalization" routine. Finalization routines are 1644 * called iteratively once all real devices have been found during 1645 * autoconfiguration, for as long as any one finalizer has done 1646 * any work. 1647 */ 1648 int 1649 config_finalize_register(device_t dev, int (*fn)(device_t)) 1650 { 1651 struct finalize_hook *f; 1652 1653 /* 1654 * If finalization has already been done, invoke the 1655 * callback function now. 1656 */ 1657 if (config_finalize_done) { 1658 while ((*fn)(dev) != 0) 1659 /* loop */ ; 1660 } 1661 1662 /* Ensure this isn't already on the list. */ 1663 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 1664 if (f->f_func == fn && f->f_dev == dev) 1665 return EEXIST; 1666 } 1667 1668 f = kmem_alloc(sizeof(*f), KM_SLEEP); 1669 f->f_func = fn; 1670 f->f_dev = dev; 1671 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 1672 1673 return 0; 1674 } 1675 1676 void 1677 config_finalize(void) 1678 { 1679 struct finalize_hook *f; 1680 struct pdevinit *pdev; 1681 extern struct pdevinit pdevinit[]; 1682 int errcnt, rv; 1683 1684 /* 1685 * Now that device driver threads have been created, wait for 1686 * them to finish any deferred autoconfiguration. 1687 */ 1688 mutex_enter(&config_misc_lock); 1689 while (config_pending != 0) 1690 cv_wait(&config_misc_cv, &config_misc_lock); 1691 mutex_exit(&config_misc_lock); 1692 1693 KERNEL_LOCK(1, NULL); 1694 1695 /* Attach pseudo-devices. */ 1696 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 1697 (*pdev->pdev_attach)(pdev->pdev_count); 1698 1699 /* Run the hooks until none of them does any work. */ 1700 do { 1701 rv = 0; 1702 TAILQ_FOREACH(f, &config_finalize_list, f_list) 1703 rv |= (*f->f_func)(f->f_dev); 1704 } while (rv != 0); 1705 1706 config_finalize_done = 1; 1707 1708 /* Now free all the hooks. */ 1709 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 1710 TAILQ_REMOVE(&config_finalize_list, f, f_list); 1711 kmem_free(f, sizeof(*f)); 1712 } 1713 1714 KERNEL_UNLOCK_ONE(NULL); 1715 1716 errcnt = aprint_get_error_count(); 1717 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 1718 (boothowto & AB_VERBOSE) == 0) { 1719 mutex_enter(&config_misc_lock); 1720 if (config_do_twiddle) { 1721 config_do_twiddle = 0; 1722 printf_nolog(" done.\n"); 1723 } 1724 mutex_exit(&config_misc_lock); 1725 if (errcnt != 0) { 1726 printf("WARNING: %d error%s while detecting hardware; " 1727 "check system log.\n", errcnt, 1728 errcnt == 1 ? "" : "s"); 1729 } 1730 } 1731 } 1732 1733 void 1734 config_twiddle_init() 1735 { 1736 1737 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 1738 config_do_twiddle = 1; 1739 } 1740 callout_setfunc(&config_twiddle_ch, config_twiddle_fn, NULL); 1741 } 1742 1743 void 1744 config_twiddle_fn(void *cookie) 1745 { 1746 1747 mutex_enter(&config_misc_lock); 1748 if (config_do_twiddle) { 1749 twiddle(); 1750 callout_schedule(&config_twiddle_ch, mstohz(100)); 1751 } 1752 mutex_exit(&config_misc_lock); 1753 } 1754 1755 /* 1756 * device_lookup: 1757 * 1758 * Look up a device instance for a given driver. 1759 */ 1760 device_t 1761 device_lookup(cfdriver_t cd, int unit) 1762 { 1763 1764 if (unit < 0 || unit >= cd->cd_ndevs) 1765 return NULL; 1766 1767 return cd->cd_devs[unit]; 1768 } 1769 1770 /* 1771 * device_lookup: 1772 * 1773 * Look up a device instance for a given driver. 1774 */ 1775 void * 1776 device_lookup_private(cfdriver_t cd, int unit) 1777 { 1778 device_t dv; 1779 1780 if (unit < 0 || unit >= cd->cd_ndevs) 1781 return NULL; 1782 1783 if ((dv = cd->cd_devs[unit]) == NULL) 1784 return NULL; 1785 1786 return dv->dv_private; 1787 } 1788 1789 /* 1790 * Accessor functions for the device_t type. 1791 */ 1792 devclass_t 1793 device_class(device_t dev) 1794 { 1795 1796 return dev->dv_class; 1797 } 1798 1799 cfdata_t 1800 device_cfdata(device_t dev) 1801 { 1802 1803 return dev->dv_cfdata; 1804 } 1805 1806 cfdriver_t 1807 device_cfdriver(device_t dev) 1808 { 1809 1810 return dev->dv_cfdriver; 1811 } 1812 1813 cfattach_t 1814 device_cfattach(device_t dev) 1815 { 1816 1817 return dev->dv_cfattach; 1818 } 1819 1820 int 1821 device_unit(device_t dev) 1822 { 1823 1824 return dev->dv_unit; 1825 } 1826 1827 const char * 1828 device_xname(device_t dev) 1829 { 1830 1831 return dev->dv_xname; 1832 } 1833 1834 device_t 1835 device_parent(device_t dev) 1836 { 1837 1838 return dev->dv_parent; 1839 } 1840 1841 bool 1842 device_is_active(device_t dev) 1843 { 1844 int active_flags; 1845 1846 active_flags = DVF_ACTIVE; 1847 active_flags |= DVF_CLASS_SUSPENDED; 1848 active_flags |= DVF_DRIVER_SUSPENDED; 1849 active_flags |= DVF_BUS_SUSPENDED; 1850 1851 return (dev->dv_flags & active_flags) == DVF_ACTIVE; 1852 } 1853 1854 bool 1855 device_is_enabled(device_t dev) 1856 { 1857 return (dev->dv_flags & DVF_ACTIVE) == DVF_ACTIVE; 1858 } 1859 1860 bool 1861 device_has_power(device_t dev) 1862 { 1863 int active_flags; 1864 1865 active_flags = DVF_ACTIVE | DVF_BUS_SUSPENDED; 1866 1867 return (dev->dv_flags & active_flags) == DVF_ACTIVE; 1868 } 1869 1870 int 1871 device_locator(device_t dev, u_int locnum) 1872 { 1873 1874 KASSERT(dev->dv_locators != NULL); 1875 return dev->dv_locators[locnum]; 1876 } 1877 1878 void * 1879 device_private(device_t dev) 1880 { 1881 1882 /* 1883 * The reason why device_private(NULL) is allowed is to simplify the 1884 * work of a lot of userspace request handlers (i.e., c/bdev 1885 * handlers) which grab cfdriver_t->cd_units[n]. 1886 * It avoids having them test for it to be NULL and only then calling 1887 * device_private. 1888 */ 1889 return dev == NULL ? NULL : dev->dv_private; 1890 } 1891 1892 prop_dictionary_t 1893 device_properties(device_t dev) 1894 { 1895 1896 return dev->dv_properties; 1897 } 1898 1899 /* 1900 * device_is_a: 1901 * 1902 * Returns true if the device is an instance of the specified 1903 * driver. 1904 */ 1905 bool 1906 device_is_a(device_t dev, const char *dname) 1907 { 1908 1909 return strcmp(dev->dv_cfdriver->cd_name, dname) == 0; 1910 } 1911 1912 /* 1913 * device_find_by_xname: 1914 * 1915 * Returns the device of the given name or NULL if it doesn't exist. 1916 */ 1917 device_t 1918 device_find_by_xname(const char *name) 1919 { 1920 device_t dv; 1921 deviter_t di; 1922 1923 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 1924 if (strcmp(device_xname(dv), name) == 0) 1925 break; 1926 } 1927 deviter_release(&di); 1928 1929 return dv; 1930 } 1931 1932 /* 1933 * device_find_by_driver_unit: 1934 * 1935 * Returns the device of the given driver name and unit or 1936 * NULL if it doesn't exist. 1937 */ 1938 device_t 1939 device_find_by_driver_unit(const char *name, int unit) 1940 { 1941 struct cfdriver *cd; 1942 1943 if ((cd = config_cfdriver_lookup(name)) == NULL) 1944 return NULL; 1945 return device_lookup(cd, unit); 1946 } 1947 1948 /* 1949 * Power management related functions. 1950 */ 1951 1952 bool 1953 device_pmf_is_registered(device_t dev) 1954 { 1955 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 1956 } 1957 1958 bool 1959 device_pmf_driver_suspend(device_t dev PMF_FN_ARGS) 1960 { 1961 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 1962 return true; 1963 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 1964 return false; 1965 if (*dev->dv_driver_suspend != NULL && 1966 !(*dev->dv_driver_suspend)(dev PMF_FN_CALL)) 1967 return false; 1968 1969 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 1970 return true; 1971 } 1972 1973 bool 1974 device_pmf_driver_resume(device_t dev PMF_FN_ARGS) 1975 { 1976 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 1977 return true; 1978 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 1979 return false; 1980 if ((flags & PMF_F_SELF) != 0 && !device_is_self_suspended(dev)) 1981 return false; 1982 if (*dev->dv_driver_resume != NULL && 1983 !(*dev->dv_driver_resume)(dev PMF_FN_CALL)) 1984 return false; 1985 1986 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 1987 return true; 1988 } 1989 1990 bool 1991 device_pmf_driver_shutdown(device_t dev, int how) 1992 { 1993 1994 if (*dev->dv_driver_shutdown != NULL && 1995 !(*dev->dv_driver_shutdown)(dev, how)) 1996 return false; 1997 return true; 1998 } 1999 2000 bool 2001 device_pmf_driver_register(device_t dev, 2002 bool (*suspend)(device_t PMF_FN_PROTO), 2003 bool (*resume)(device_t PMF_FN_PROTO), 2004 bool (*shutdown)(device_t, int)) 2005 { 2006 dev->dv_driver_suspend = suspend; 2007 dev->dv_driver_resume = resume; 2008 dev->dv_driver_shutdown = shutdown; 2009 dev->dv_flags |= DVF_POWER_HANDLERS; 2010 return true; 2011 } 2012 2013 static const char * 2014 curlwp_name(void) 2015 { 2016 if (curlwp->l_name != NULL) 2017 return curlwp->l_name; 2018 else 2019 return curlwp->l_proc->p_comm; 2020 } 2021 2022 void 2023 device_pmf_driver_deregister(device_t dev) 2024 { 2025 device_lock_t dvl = device_getlock(dev); 2026 2027 dev->dv_driver_suspend = NULL; 2028 dev->dv_driver_resume = NULL; 2029 2030 mutex_enter(&dvl->dvl_mtx); 2031 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2032 while (dvl->dvl_nlock > 0 || dvl->dvl_nwait > 0) { 2033 /* Wake a thread that waits for the lock. That 2034 * thread will fail to acquire the lock, and then 2035 * it will wake the next thread that waits for the 2036 * lock, or else it will wake us. 2037 */ 2038 cv_signal(&dvl->dvl_cv); 2039 pmflock_debug(dev, __func__, __LINE__); 2040 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2041 pmflock_debug(dev, __func__, __LINE__); 2042 } 2043 mutex_exit(&dvl->dvl_mtx); 2044 } 2045 2046 bool 2047 device_pmf_driver_child_register(device_t dev) 2048 { 2049 device_t parent = device_parent(dev); 2050 2051 if (parent == NULL || parent->dv_driver_child_register == NULL) 2052 return true; 2053 return (*parent->dv_driver_child_register)(dev); 2054 } 2055 2056 void 2057 device_pmf_driver_set_child_register(device_t dev, 2058 bool (*child_register)(device_t)) 2059 { 2060 dev->dv_driver_child_register = child_register; 2061 } 2062 2063 void 2064 device_pmf_self_resume(device_t dev PMF_FN_ARGS) 2065 { 2066 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2067 if ((dev->dv_flags & DVF_SELF_SUSPENDED) != 0) 2068 dev->dv_flags &= ~DVF_SELF_SUSPENDED; 2069 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2070 } 2071 2072 bool 2073 device_is_self_suspended(device_t dev) 2074 { 2075 return (dev->dv_flags & DVF_SELF_SUSPENDED) != 0; 2076 } 2077 2078 void 2079 device_pmf_self_suspend(device_t dev PMF_FN_ARGS) 2080 { 2081 bool self = (flags & PMF_F_SELF) != 0; 2082 2083 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2084 2085 if (!self) 2086 dev->dv_flags &= ~DVF_SELF_SUSPENDED; 2087 else if (device_is_active(dev)) 2088 dev->dv_flags |= DVF_SELF_SUSPENDED; 2089 2090 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2091 } 2092 2093 static void 2094 pmflock_debug(device_t dev, const char *func, int line) 2095 { 2096 device_lock_t dvl = device_getlock(dev); 2097 2098 aprint_debug_dev(dev, "%s.%d, %s dvl_nlock %d dvl_nwait %d dv_flags %x\n", 2099 func, line, curlwp_name(), dvl->dvl_nlock, dvl->dvl_nwait, 2100 dev->dv_flags); 2101 } 2102 2103 static void 2104 pmflock_debug_with_flags(device_t dev, const char *func, int line PMF_FN_ARGS) 2105 { 2106 device_lock_t dvl = device_getlock(dev); 2107 2108 aprint_debug_dev(dev, "%s.%d, %s dvl_nlock %d dvl_nwait %d dv_flags %x " 2109 "flags " PMF_FLAGS_FMT "\n", func, line, curlwp_name(), 2110 dvl->dvl_nlock, dvl->dvl_nwait, dev->dv_flags PMF_FN_CALL); 2111 } 2112 2113 static bool 2114 device_pmf_lock1(device_t dev PMF_FN_ARGS) 2115 { 2116 device_lock_t dvl = device_getlock(dev); 2117 2118 while (device_pmf_is_registered(dev) && 2119 dvl->dvl_nlock > 0 && dvl->dvl_holder != curlwp) { 2120 dvl->dvl_nwait++; 2121 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2122 cv_wait(&dvl->dvl_cv, &dvl->dvl_mtx); 2123 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2124 dvl->dvl_nwait--; 2125 } 2126 if (!device_pmf_is_registered(dev)) { 2127 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2128 /* We could not acquire the lock, but some other thread may 2129 * wait for it, also. Wake that thread. 2130 */ 2131 cv_signal(&dvl->dvl_cv); 2132 return false; 2133 } 2134 dvl->dvl_nlock++; 2135 dvl->dvl_holder = curlwp; 2136 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2137 return true; 2138 } 2139 2140 bool 2141 device_pmf_lock(device_t dev PMF_FN_ARGS) 2142 { 2143 bool rc; 2144 device_lock_t dvl = device_getlock(dev); 2145 2146 mutex_enter(&dvl->dvl_mtx); 2147 rc = device_pmf_lock1(dev PMF_FN_CALL); 2148 mutex_exit(&dvl->dvl_mtx); 2149 2150 return rc; 2151 } 2152 2153 void 2154 device_pmf_unlock(device_t dev PMF_FN_ARGS) 2155 { 2156 device_lock_t dvl = device_getlock(dev); 2157 2158 KASSERT(dvl->dvl_nlock > 0); 2159 mutex_enter(&dvl->dvl_mtx); 2160 if (--dvl->dvl_nlock == 0) 2161 dvl->dvl_holder = NULL; 2162 cv_signal(&dvl->dvl_cv); 2163 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2164 mutex_exit(&dvl->dvl_mtx); 2165 } 2166 2167 device_lock_t 2168 device_getlock(device_t dev) 2169 { 2170 return &dev->dv_lock; 2171 } 2172 2173 void * 2174 device_pmf_bus_private(device_t dev) 2175 { 2176 return dev->dv_bus_private; 2177 } 2178 2179 bool 2180 device_pmf_bus_suspend(device_t dev PMF_FN_ARGS) 2181 { 2182 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2183 return true; 2184 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2185 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2186 return false; 2187 if (*dev->dv_bus_suspend != NULL && 2188 !(*dev->dv_bus_suspend)(dev PMF_FN_CALL)) 2189 return false; 2190 2191 dev->dv_flags |= DVF_BUS_SUSPENDED; 2192 return true; 2193 } 2194 2195 bool 2196 device_pmf_bus_resume(device_t dev PMF_FN_ARGS) 2197 { 2198 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2199 return true; 2200 if ((flags & PMF_F_SELF) != 0 && !device_is_self_suspended(dev)) 2201 return false; 2202 if (*dev->dv_bus_resume != NULL && 2203 !(*dev->dv_bus_resume)(dev PMF_FN_CALL)) 2204 return false; 2205 2206 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2207 return true; 2208 } 2209 2210 bool 2211 device_pmf_bus_shutdown(device_t dev, int how) 2212 { 2213 2214 if (*dev->dv_bus_shutdown != NULL && 2215 !(*dev->dv_bus_shutdown)(dev, how)) 2216 return false; 2217 return true; 2218 } 2219 2220 void 2221 device_pmf_bus_register(device_t dev, void *priv, 2222 bool (*suspend)(device_t PMF_FN_PROTO), 2223 bool (*resume)(device_t PMF_FN_PROTO), 2224 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2225 { 2226 dev->dv_bus_private = priv; 2227 dev->dv_bus_resume = resume; 2228 dev->dv_bus_suspend = suspend; 2229 dev->dv_bus_shutdown = shutdown; 2230 dev->dv_bus_deregister = deregister; 2231 } 2232 2233 void 2234 device_pmf_bus_deregister(device_t dev) 2235 { 2236 if (dev->dv_bus_deregister == NULL) 2237 return; 2238 (*dev->dv_bus_deregister)(dev); 2239 dev->dv_bus_private = NULL; 2240 dev->dv_bus_suspend = NULL; 2241 dev->dv_bus_resume = NULL; 2242 dev->dv_bus_deregister = NULL; 2243 } 2244 2245 void * 2246 device_pmf_class_private(device_t dev) 2247 { 2248 return dev->dv_class_private; 2249 } 2250 2251 bool 2252 device_pmf_class_suspend(device_t dev PMF_FN_ARGS) 2253 { 2254 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2255 return true; 2256 if (*dev->dv_class_suspend != NULL && 2257 !(*dev->dv_class_suspend)(dev PMF_FN_CALL)) 2258 return false; 2259 2260 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2261 return true; 2262 } 2263 2264 bool 2265 device_pmf_class_resume(device_t dev PMF_FN_ARGS) 2266 { 2267 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2268 return true; 2269 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2270 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2271 return false; 2272 if (*dev->dv_class_resume != NULL && 2273 !(*dev->dv_class_resume)(dev PMF_FN_CALL)) 2274 return false; 2275 2276 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2277 return true; 2278 } 2279 2280 void 2281 device_pmf_class_register(device_t dev, void *priv, 2282 bool (*suspend)(device_t PMF_FN_PROTO), 2283 bool (*resume)(device_t PMF_FN_PROTO), 2284 void (*deregister)(device_t)) 2285 { 2286 dev->dv_class_private = priv; 2287 dev->dv_class_suspend = suspend; 2288 dev->dv_class_resume = resume; 2289 dev->dv_class_deregister = deregister; 2290 } 2291 2292 void 2293 device_pmf_class_deregister(device_t dev) 2294 { 2295 if (dev->dv_class_deregister == NULL) 2296 return; 2297 (*dev->dv_class_deregister)(dev); 2298 dev->dv_class_private = NULL; 2299 dev->dv_class_suspend = NULL; 2300 dev->dv_class_resume = NULL; 2301 dev->dv_class_deregister = NULL; 2302 } 2303 2304 bool 2305 device_active(device_t dev, devactive_t type) 2306 { 2307 size_t i; 2308 2309 if (dev->dv_activity_count == 0) 2310 return false; 2311 2312 for (i = 0; i < dev->dv_activity_count; ++i) { 2313 if (dev->dv_activity_handlers[i] == NULL) 2314 break; 2315 (*dev->dv_activity_handlers[i])(dev, type); 2316 } 2317 2318 return true; 2319 } 2320 2321 bool 2322 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2323 { 2324 void (**new_handlers)(device_t, devactive_t); 2325 void (**old_handlers)(device_t, devactive_t); 2326 size_t i, old_size, new_size; 2327 int s; 2328 2329 old_handlers = dev->dv_activity_handlers; 2330 old_size = dev->dv_activity_count; 2331 2332 for (i = 0; i < old_size; ++i) { 2333 KASSERT(old_handlers[i] != handler); 2334 if (old_handlers[i] == NULL) { 2335 old_handlers[i] = handler; 2336 return true; 2337 } 2338 } 2339 2340 new_size = old_size + 4; 2341 new_handlers = kmem_alloc(sizeof(void *[new_size]), KM_SLEEP); 2342 2343 memcpy(new_handlers, old_handlers, sizeof(void *[old_size])); 2344 new_handlers[old_size] = handler; 2345 memset(new_handlers + old_size + 1, 0, 2346 sizeof(int [new_size - (old_size+1)])); 2347 2348 s = splhigh(); 2349 dev->dv_activity_count = new_size; 2350 dev->dv_activity_handlers = new_handlers; 2351 splx(s); 2352 2353 if (old_handlers != NULL) 2354 kmem_free(old_handlers, sizeof(void * [old_size])); 2355 2356 return true; 2357 } 2358 2359 void 2360 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2361 { 2362 void (**old_handlers)(device_t, devactive_t); 2363 size_t i, old_size; 2364 int s; 2365 2366 old_handlers = dev->dv_activity_handlers; 2367 old_size = dev->dv_activity_count; 2368 2369 for (i = 0; i < old_size; ++i) { 2370 if (old_handlers[i] == handler) 2371 break; 2372 if (old_handlers[i] == NULL) 2373 return; /* XXX panic? */ 2374 } 2375 2376 if (i == old_size) 2377 return; /* XXX panic? */ 2378 2379 for (; i < old_size - 1; ++i) { 2380 if ((old_handlers[i] = old_handlers[i + 1]) != NULL) 2381 continue; 2382 2383 if (i == 0) { 2384 s = splhigh(); 2385 dev->dv_activity_count = 0; 2386 dev->dv_activity_handlers = NULL; 2387 splx(s); 2388 kmem_free(old_handlers, sizeof(void *[old_size])); 2389 } 2390 return; 2391 } 2392 old_handlers[i] = NULL; 2393 } 2394 2395 /* 2396 * Device Iteration 2397 * 2398 * deviter_t: a device iterator. Holds state for a "walk" visiting 2399 * each device_t's in the device tree. 2400 * 2401 * deviter_init(di, flags): initialize the device iterator `di' 2402 * to "walk" the device tree. deviter_next(di) will return 2403 * the first device_t in the device tree, or NULL if there are 2404 * no devices. 2405 * 2406 * `flags' is one or more of DEVITER_F_RW, indicating that the 2407 * caller intends to modify the device tree by calling 2408 * config_detach(9) on devices in the order that the iterator 2409 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2410 * nearest the "root" of the device tree to be returned, first; 2411 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2412 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2413 * indicating both that deviter_init() should not respect any 2414 * locks on the device tree, and that deviter_next(di) may run 2415 * in more than one LWP before the walk has finished. 2416 * 2417 * Only one DEVITER_F_RW iterator may be in the device tree at 2418 * once. 2419 * 2420 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2421 * 2422 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2423 * DEVITER_F_LEAVES_FIRST are used in combination. 2424 * 2425 * deviter_first(di, flags): initialize the device iterator `di' 2426 * and return the first device_t in the device tree, or NULL 2427 * if there are no devices. The statement 2428 * 2429 * dv = deviter_first(di); 2430 * 2431 * is shorthand for 2432 * 2433 * deviter_init(di); 2434 * dv = deviter_next(di); 2435 * 2436 * deviter_next(di): return the next device_t in the device tree, 2437 * or NULL if there are no more devices. deviter_next(di) 2438 * is undefined if `di' was not initialized with deviter_init() or 2439 * deviter_first(). 2440 * 2441 * deviter_release(di): stops iteration (subsequent calls to 2442 * deviter_next() will return NULL), releases any locks and 2443 * resources held by the device iterator. 2444 * 2445 * Device iteration does not return device_t's in any particular 2446 * order. An iterator will never return the same device_t twice. 2447 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2448 * is called repeatedly on the same `di', it will eventually return 2449 * NULL. It is ok to attach/detach devices during device iteration. 2450 */ 2451 void 2452 deviter_init(deviter_t *di, deviter_flags_t flags) 2453 { 2454 device_t dv; 2455 bool rw; 2456 2457 mutex_enter(&alldevs_mtx); 2458 if ((flags & DEVITER_F_SHUTDOWN) != 0) { 2459 flags |= DEVITER_F_RW; 2460 alldevs_nwrite++; 2461 alldevs_writer = NULL; 2462 alldevs_nread = 0; 2463 } else { 2464 rw = (flags & DEVITER_F_RW) != 0; 2465 2466 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 2467 ; 2468 else while ((alldevs_nwrite != 0 && alldevs_writer != curlwp) || 2469 (rw && alldevs_nread != 0)) 2470 cv_wait(&alldevs_cv, &alldevs_mtx); 2471 2472 if (rw) { 2473 if (alldevs_nwrite++ == 0) 2474 alldevs_writer = curlwp; 2475 } else 2476 alldevs_nread++; 2477 } 2478 mutex_exit(&alldevs_mtx); 2479 2480 memset(di, 0, sizeof(*di)); 2481 2482 di->di_flags = flags; 2483 2484 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2485 case DEVITER_F_LEAVES_FIRST: 2486 TAILQ_FOREACH(dv, &alldevs, dv_list) 2487 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2488 break; 2489 case DEVITER_F_ROOT_FIRST: 2490 TAILQ_FOREACH(dv, &alldevs, dv_list) 2491 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2492 break; 2493 default: 2494 break; 2495 } 2496 2497 deviter_reinit(di); 2498 } 2499 2500 static void 2501 deviter_reinit(deviter_t *di) 2502 { 2503 if ((di->di_flags & DEVITER_F_RW) != 0) 2504 di->di_prev = TAILQ_LAST(&alldevs, devicelist); 2505 else 2506 di->di_prev = TAILQ_FIRST(&alldevs); 2507 } 2508 2509 device_t 2510 deviter_first(deviter_t *di, deviter_flags_t flags) 2511 { 2512 deviter_init(di, flags); 2513 return deviter_next(di); 2514 } 2515 2516 static device_t 2517 deviter_next1(deviter_t *di) 2518 { 2519 device_t dv; 2520 2521 dv = di->di_prev; 2522 2523 if (dv == NULL) 2524 ; 2525 else if ((di->di_flags & DEVITER_F_RW) != 0) 2526 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2527 else 2528 di->di_prev = TAILQ_NEXT(dv, dv_list); 2529 2530 return dv; 2531 } 2532 2533 device_t 2534 deviter_next(deviter_t *di) 2535 { 2536 device_t dv = NULL; 2537 2538 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2539 case 0: 2540 return deviter_next1(di); 2541 case DEVITER_F_LEAVES_FIRST: 2542 while (di->di_curdepth >= 0) { 2543 if ((dv = deviter_next1(di)) == NULL) { 2544 di->di_curdepth--; 2545 deviter_reinit(di); 2546 } else if (dv->dv_depth == di->di_curdepth) 2547 break; 2548 } 2549 return dv; 2550 case DEVITER_F_ROOT_FIRST: 2551 while (di->di_curdepth <= di->di_maxdepth) { 2552 if ((dv = deviter_next1(di)) == NULL) { 2553 di->di_curdepth++; 2554 deviter_reinit(di); 2555 } else if (dv->dv_depth == di->di_curdepth) 2556 break; 2557 } 2558 return dv; 2559 default: 2560 return NULL; 2561 } 2562 } 2563 2564 void 2565 deviter_release(deviter_t *di) 2566 { 2567 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 2568 2569 mutex_enter(&alldevs_mtx); 2570 if (!rw) { 2571 --alldevs_nread; 2572 cv_signal(&alldevs_cv); 2573 } else if (alldevs_nwrite > 0 && alldevs_writer == NULL) { 2574 --alldevs_nwrite; /* shutting down: do not signal */ 2575 } else { 2576 KASSERT(alldevs_nwrite != 0); 2577 if (--alldevs_nwrite == 0) 2578 alldevs_writer = NULL; 2579 cv_signal(&alldevs_cv); 2580 } 2581 mutex_exit(&alldevs_mtx); 2582 } 2583 2584 static void 2585 sysctl_detach_setup(struct sysctllog **clog) 2586 { 2587 const struct sysctlnode *node = NULL; 2588 2589 sysctl_createv(clog, 0, NULL, &node, 2590 CTLFLAG_PERMANENT, 2591 CTLTYPE_NODE, "kern", NULL, 2592 NULL, 0, NULL, 0, 2593 CTL_KERN, CTL_EOL); 2594 2595 if (node == NULL) 2596 return; 2597 2598 sysctl_createv(clog, 0, &node, NULL, 2599 CTLFLAG_PERMANENT | CTLFLAG_READWRITE, 2600 CTLTYPE_INT, "detachall", 2601 SYSCTL_DESCR("Detach all devices at shutdown"), 2602 NULL, 0, &detachall, 0, 2603 CTL_CREATE, CTL_EOL); 2604 } 2605
Indexes created Fri Sep 26 08:10:20 GMT 2025