subr_autoconf.c revision 1.142
1 /* $NetBSD: subr_autoconf.c,v 1.142 2008/04/01 10:37:42 ad 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 1.142 2008/04/01 10:37:42 ad Exp $"); 81 82 #include "opt_multiprocessor.h" 83 #include "opt_ddb.h" 84 85 #include <sys/param.h> 86 #include <sys/device.h> 87 #include <sys/disklabel.h> 88 #include <sys/conf.h> 89 #include <sys/kauth.h> 90 #include <sys/malloc.h> 91 #include <sys/systm.h> 92 #include <sys/kernel.h> 93 #include <sys/errno.h> 94 #include <sys/proc.h> 95 #include <sys/reboot.h> 96 #include <sys/kthread.h> 97 #include <sys/buf.h> 98 #include <sys/dirent.h> 99 #include <sys/vnode.h> 100 #include <sys/mount.h> 101 #include <sys/namei.h> 102 #include <sys/unistd.h> 103 #include <sys/fcntl.h> 104 #include <sys/lockf.h> 105 #include <sys/callout.h> 106 #include <sys/mutex.h> 107 #include <sys/condvar.h> 108 109 #include <sys/disk.h> 110 111 #include <machine/limits.h> 112 113 #include "opt_userconf.h" 114 #ifdef USERCONF 115 #include <sys/userconf.h> 116 #endif 117 118 #ifdef __i386__ 119 #include "opt_splash.h" 120 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 121 #include <dev/splash/splash.h> 122 extern struct splash_progress *splash_progress_state; 123 #endif 124 #endif 125 126 /* 127 * Autoconfiguration subroutines. 128 */ 129 130 typedef struct pmf_private { 131 int pp_nwait; 132 int pp_nlock; 133 lwp_t *pp_holder; 134 kmutex_t pp_mtx; 135 kcondvar_t pp_cv; 136 } pmf_private_t; 137 138 /* 139 * ioconf.c exports exactly two names: cfdata and cfroots. All system 140 * devices and drivers are found via these tables. 141 */ 142 extern struct cfdata cfdata[]; 143 extern const short cfroots[]; 144 145 /* 146 * List of all cfdriver structures. We use this to detect duplicates 147 * when other cfdrivers are loaded. 148 */ 149 struct cfdriverlist allcfdrivers = LIST_HEAD_INITIALIZER(&allcfdrivers); 150 extern struct cfdriver * const cfdriver_list_initial[]; 151 152 /* 153 * Initial list of cfattach's. 154 */ 155 extern const struct cfattachinit cfattachinit[]; 156 157 /* 158 * List of cfdata tables. We always have one such list -- the one 159 * built statically when the kernel was configured. 160 */ 161 struct cftablelist allcftables = TAILQ_HEAD_INITIALIZER(allcftables); 162 static struct cftable initcftable; 163 164 #define ROOT ((device_t)NULL) 165 166 struct matchinfo { 167 cfsubmatch_t fn; 168 struct device *parent; 169 const int *locs; 170 void *aux; 171 struct cfdata *match; 172 int pri; 173 }; 174 175 static char *number(char *, int); 176 static void mapply(struct matchinfo *, cfdata_t); 177 static device_t config_devalloc(const device_t, const cfdata_t, const int *); 178 static void config_devdealloc(device_t); 179 static void config_makeroom(int, struct cfdriver *); 180 static void config_devlink(device_t); 181 static void config_devunlink(device_t); 182 183 static void pmflock_debug(device_t, const char *, int); 184 static void pmflock_debug_with_flags(device_t, const char *, int PMF_FN_PROTO); 185 186 static device_t deviter_next1(deviter_t *); 187 static void deviter_reinit(deviter_t *); 188 189 struct deferred_config { 190 TAILQ_ENTRY(deferred_config) dc_queue; 191 device_t dc_dev; 192 void (*dc_func)(device_t); 193 }; 194 195 TAILQ_HEAD(deferred_config_head, deferred_config); 196 197 struct deferred_config_head deferred_config_queue = 198 TAILQ_HEAD_INITIALIZER(deferred_config_queue); 199 struct deferred_config_head interrupt_config_queue = 200 TAILQ_HEAD_INITIALIZER(interrupt_config_queue); 201 int interrupt_config_threads = 8; 202 203 static void config_process_deferred(struct deferred_config_head *, device_t); 204 205 /* Hooks to finalize configuration once all real devices have been found. */ 206 struct finalize_hook { 207 TAILQ_ENTRY(finalize_hook) f_list; 208 int (*f_func)(device_t); 209 device_t f_dev; 210 }; 211 static TAILQ_HEAD(, finalize_hook) config_finalize_list = 212 TAILQ_HEAD_INITIALIZER(config_finalize_list); 213 static int config_finalize_done; 214 215 /* list of all devices */ 216 struct devicelist alldevs = TAILQ_HEAD_INITIALIZER(alldevs); 217 kcondvar_t alldevs_cv; 218 kmutex_t alldevs_mtx; 219 static int alldevs_nread = 0; 220 static int alldevs_nwrite = 0; 221 static lwp_t *alldevs_writer = NULL; 222 223 volatile int config_pending; /* semaphore for mountroot */ 224 225 #define STREQ(s1, s2) \ 226 (*(s1) == *(s2) && strcmp((s1), (s2)) == 0) 227 228 static int config_initialized; /* config_init() has been called. */ 229 230 static int config_do_twiddle; 231 232 MALLOC_DEFINE(M_PMFPRIV, "pmfpriv", "device pmf private storage"); 233 234 struct vnode * 235 opendisk(struct device *dv) 236 { 237 int bmajor, bminor; 238 struct vnode *tmpvn; 239 int error; 240 dev_t dev; 241 242 /* 243 * Lookup major number for disk block device. 244 */ 245 bmajor = devsw_name2blk(device_xname(dv), NULL, 0); 246 if (bmajor == -1) 247 return NULL; 248 249 bminor = minor(device_unit(dv)); 250 /* 251 * Fake a temporary vnode for the disk, open it, and read 252 * and hash the sectors. 253 */ 254 dev = device_is_a(dv, "dk") ? makedev(bmajor, bminor) : 255 MAKEDISKDEV(bmajor, bminor, RAW_PART); 256 if (bdevvp(dev, &tmpvn)) 257 panic("%s: can't alloc vnode for %s", __func__, 258 device_xname(dv)); 259 error = VOP_OPEN(tmpvn, FREAD, NOCRED); 260 if (error) { 261 #ifndef DEBUG 262 /* 263 * Ignore errors caused by missing device, partition, 264 * or medium. 265 */ 266 if (error != ENXIO && error != ENODEV) 267 #endif 268 printf("%s: can't open dev %s (%d)\n", 269 __func__, device_xname(dv), error); 270 vput(tmpvn); 271 return NULL; 272 } 273 274 return tmpvn; 275 } 276 277 int 278 config_handle_wedges(struct device *dv, int par) 279 { 280 struct dkwedge_list wl; 281 struct dkwedge_info *wi; 282 struct vnode *vn; 283 char diskname[16]; 284 int i, error; 285 286 if ((vn = opendisk(dv)) == NULL) 287 return -1; 288 289 wl.dkwl_bufsize = sizeof(*wi) * 16; 290 wl.dkwl_buf = wi = malloc(wl.dkwl_bufsize, M_TEMP, M_WAITOK); 291 292 error = VOP_IOCTL(vn, DIOCLWEDGES, &wl, FREAD, NOCRED); 293 VOP_CLOSE(vn, FREAD, NOCRED); 294 vput(vn); 295 if (error) { 296 #ifdef DEBUG_WEDGE 297 printf("%s: List wedges returned %d\n", 298 device_xname(dv), error); 299 #endif 300 free(wi, M_TEMP); 301 return -1; 302 } 303 304 #ifdef DEBUG_WEDGE 305 printf("%s: Returned %u(%u) wedges\n", device_xname(dv), 306 wl.dkwl_nwedges, wl.dkwl_ncopied); 307 #endif 308 snprintf(diskname, sizeof(diskname), "%s%c", device_xname(dv), 309 par + 'a'); 310 311 for (i = 0; i < wl.dkwl_ncopied; i++) { 312 #ifdef DEBUG_WEDGE 313 printf("%s: Looking for %s in %s\n", 314 device_xname(dv), diskname, wi[i].dkw_wname); 315 #endif 316 if (strcmp(wi[i].dkw_wname, diskname) == 0) 317 break; 318 } 319 320 if (i == wl.dkwl_ncopied) { 321 #ifdef DEBUG_WEDGE 322 printf("%s: Cannot find wedge with parent %s\n", 323 device_xname(dv), diskname); 324 #endif 325 free(wi, M_TEMP); 326 return -1; 327 } 328 329 #ifdef DEBUG_WEDGE 330 printf("%s: Setting boot wedge %s (%s) at %llu %llu\n", 331 device_xname(dv), wi[i].dkw_devname, wi[i].dkw_wname, 332 (unsigned long long)wi[i].dkw_offset, 333 (unsigned long long)wi[i].dkw_size); 334 #endif 335 dkwedge_set_bootwedge(dv, wi[i].dkw_offset, wi[i].dkw_size); 336 free(wi, M_TEMP); 337 return 0; 338 } 339 340 /* 341 * Initialize the autoconfiguration data structures. Normally this 342 * is done by configure(), but some platforms need to do this very 343 * early (to e.g. initialize the console). 344 */ 345 void 346 config_init(void) 347 { 348 const struct cfattachinit *cfai; 349 int i, j; 350 351 if (config_initialized) 352 return; 353 354 mutex_init(&alldevs_mtx, MUTEX_DEFAULT, IPL_NONE); 355 cv_init(&alldevs_cv, "alldevs"); 356 357 /* allcfdrivers is statically initialized. */ 358 for (i = 0; cfdriver_list_initial[i] != NULL; i++) { 359 if (config_cfdriver_attach(cfdriver_list_initial[i]) != 0) 360 panic("configure: duplicate `%s' drivers", 361 cfdriver_list_initial[i]->cd_name); 362 } 363 364 for (cfai = &cfattachinit[0]; cfai->cfai_name != NULL; cfai++) { 365 for (j = 0; cfai->cfai_list[j] != NULL; j++) { 366 if (config_cfattach_attach(cfai->cfai_name, 367 cfai->cfai_list[j]) != 0) 368 panic("configure: duplicate `%s' attachment " 369 "of `%s' driver", 370 cfai->cfai_list[j]->ca_name, 371 cfai->cfai_name); 372 } 373 } 374 375 initcftable.ct_cfdata = cfdata; 376 TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list); 377 378 config_initialized = 1; 379 } 380 381 void 382 config_deferred(device_t dev) 383 { 384 config_process_deferred(&deferred_config_queue, dev); 385 config_process_deferred(&interrupt_config_queue, dev); 386 } 387 388 static void 389 config_interrupts_thread(void *cookie) 390 { 391 struct deferred_config *dc; 392 393 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 394 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 395 (*dc->dc_func)(dc->dc_dev); 396 free(dc, M_DEVBUF); 397 config_pending_decr(); 398 } 399 kthread_exit(0); 400 } 401 402 /* 403 * Configure the system's hardware. 404 */ 405 void 406 configure(void) 407 { 408 int i; 409 410 /* Initialize data structures. */ 411 config_init(); 412 pmf_init(); 413 414 #ifdef USERCONF 415 if (boothowto & RB_USERCONF) 416 user_config(); 417 #endif 418 419 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 420 config_do_twiddle = 1; 421 printf_nolog("Detecting hardware..."); 422 } 423 424 /* 425 * Do the machine-dependent portion of autoconfiguration. This 426 * sets the configuration machinery here in motion by "finding" 427 * the root bus. When this function returns, we expect interrupts 428 * to be enabled. 429 */ 430 cpu_configure(); 431 432 /* Initialize callouts, part 2. */ 433 callout_startup2(); 434 435 /* 436 * Now that we've found all the hardware, start the real time 437 * and statistics clocks. 438 */ 439 initclocks(); 440 441 cold = 0; /* clocks are running, we're warm now! */ 442 443 /* Boot the secondary processors. */ 444 mp_online = true; 445 #if defined(MULTIPROCESSOR) 446 cpu_boot_secondary_processors(); 447 #endif 448 449 /* Setup the scheduler. */ 450 sched_init(); 451 452 /* 453 * Create threads to call back and finish configuration for 454 * devices that want interrupts enabled. 455 */ 456 for (i = 0; i < interrupt_config_threads; i++) { 457 (void)kthread_create(PRI_NONE, 0, NULL, 458 config_interrupts_thread, NULL, NULL, "config"); 459 } 460 461 /* Get the threads going and into any sleeps before continuing. */ 462 yield(); 463 464 /* Lock the kernel on behalf of lwp0. */ 465 KERNEL_LOCK(1, NULL); 466 } 467 468 /* 469 * Add a cfdriver to the system. 470 */ 471 int 472 config_cfdriver_attach(struct cfdriver *cd) 473 { 474 struct cfdriver *lcd; 475 476 /* Make sure this driver isn't already in the system. */ 477 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 478 if (STREQ(lcd->cd_name, cd->cd_name)) 479 return (EEXIST); 480 } 481 482 LIST_INIT(&cd->cd_attach); 483 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 484 485 return (0); 486 } 487 488 /* 489 * Remove a cfdriver from the system. 490 */ 491 int 492 config_cfdriver_detach(struct cfdriver *cd) 493 { 494 int i; 495 496 /* Make sure there are no active instances. */ 497 for (i = 0; i < cd->cd_ndevs; i++) { 498 if (cd->cd_devs[i] != NULL) 499 return (EBUSY); 500 } 501 502 /* ...and no attachments loaded. */ 503 if (LIST_EMPTY(&cd->cd_attach) == 0) 504 return (EBUSY); 505 506 LIST_REMOVE(cd, cd_list); 507 508 KASSERT(cd->cd_devs == NULL); 509 510 return (0); 511 } 512 513 /* 514 * Look up a cfdriver by name. 515 */ 516 struct cfdriver * 517 config_cfdriver_lookup(const char *name) 518 { 519 struct cfdriver *cd; 520 521 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 522 if (STREQ(cd->cd_name, name)) 523 return (cd); 524 } 525 526 return (NULL); 527 } 528 529 /* 530 * Add a cfattach to the specified driver. 531 */ 532 int 533 config_cfattach_attach(const char *driver, struct cfattach *ca) 534 { 535 struct cfattach *lca; 536 struct cfdriver *cd; 537 538 cd = config_cfdriver_lookup(driver); 539 if (cd == NULL) 540 return (ESRCH); 541 542 /* Make sure this attachment isn't already on this driver. */ 543 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 544 if (STREQ(lca->ca_name, ca->ca_name)) 545 return (EEXIST); 546 } 547 548 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 549 550 return (0); 551 } 552 553 /* 554 * Remove a cfattach from the specified driver. 555 */ 556 int 557 config_cfattach_detach(const char *driver, struct cfattach *ca) 558 { 559 struct cfdriver *cd; 560 device_t dev; 561 int i; 562 563 cd = config_cfdriver_lookup(driver); 564 if (cd == NULL) 565 return (ESRCH); 566 567 /* Make sure there are no active instances. */ 568 for (i = 0; i < cd->cd_ndevs; i++) { 569 if ((dev = cd->cd_devs[i]) == NULL) 570 continue; 571 if (dev->dv_cfattach == ca) 572 return (EBUSY); 573 } 574 575 LIST_REMOVE(ca, ca_list); 576 577 return (0); 578 } 579 580 /* 581 * Look up a cfattach by name. 582 */ 583 static struct cfattach * 584 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 585 { 586 struct cfattach *ca; 587 588 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 589 if (STREQ(ca->ca_name, atname)) 590 return (ca); 591 } 592 593 return (NULL); 594 } 595 596 /* 597 * Look up a cfattach by driver/attachment name. 598 */ 599 struct cfattach * 600 config_cfattach_lookup(const char *name, const char *atname) 601 { 602 struct cfdriver *cd; 603 604 cd = config_cfdriver_lookup(name); 605 if (cd == NULL) 606 return (NULL); 607 608 return (config_cfattach_lookup_cd(cd, atname)); 609 } 610 611 /* 612 * Apply the matching function and choose the best. This is used 613 * a few times and we want to keep the code small. 614 */ 615 static void 616 mapply(struct matchinfo *m, cfdata_t cf) 617 { 618 int pri; 619 620 if (m->fn != NULL) { 621 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 622 } else { 623 pri = config_match(m->parent, cf, m->aux); 624 } 625 if (pri > m->pri) { 626 m->match = cf; 627 m->pri = pri; 628 } 629 } 630 631 int 632 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 633 { 634 const struct cfiattrdata *ci; 635 const struct cflocdesc *cl; 636 int nlocs, i; 637 638 ci = cfiattr_lookup(cf->cf_pspec->cfp_iattr, parent->dv_cfdriver); 639 KASSERT(ci); 640 nlocs = ci->ci_loclen; 641 for (i = 0; i < nlocs; i++) { 642 cl = &ci->ci_locdesc[i]; 643 /* !cld_defaultstr means no default value */ 644 if ((!(cl->cld_defaultstr) 645 || (cf->cf_loc[i] != cl->cld_default)) 646 && cf->cf_loc[i] != locs[i]) 647 return (0); 648 } 649 650 return (config_match(parent, cf, aux)); 651 } 652 653 /* 654 * Helper function: check whether the driver supports the interface attribute 655 * and return its descriptor structure. 656 */ 657 static const struct cfiattrdata * 658 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 659 { 660 const struct cfiattrdata * const *cpp; 661 662 if (cd->cd_attrs == NULL) 663 return (0); 664 665 for (cpp = cd->cd_attrs; *cpp; cpp++) { 666 if (STREQ((*cpp)->ci_name, ia)) { 667 /* Match. */ 668 return (*cpp); 669 } 670 } 671 return (0); 672 } 673 674 /* 675 * Lookup an interface attribute description by name. 676 * If the driver is given, consider only its supported attributes. 677 */ 678 const struct cfiattrdata * 679 cfiattr_lookup(const char *name, const struct cfdriver *cd) 680 { 681 const struct cfdriver *d; 682 const struct cfiattrdata *ia; 683 684 if (cd) 685 return (cfdriver_get_iattr(cd, name)); 686 687 LIST_FOREACH(d, &allcfdrivers, cd_list) { 688 ia = cfdriver_get_iattr(d, name); 689 if (ia) 690 return (ia); 691 } 692 return (0); 693 } 694 695 /* 696 * Determine if `parent' is a potential parent for a device spec based 697 * on `cfp'. 698 */ 699 static int 700 cfparent_match(const device_t parent, const struct cfparent *cfp) 701 { 702 struct cfdriver *pcd; 703 704 /* We don't match root nodes here. */ 705 if (cfp == NULL) 706 return (0); 707 708 pcd = parent->dv_cfdriver; 709 KASSERT(pcd != NULL); 710 711 /* 712 * First, ensure this parent has the correct interface 713 * attribute. 714 */ 715 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 716 return (0); 717 718 /* 719 * If no specific parent device instance was specified (i.e. 720 * we're attaching to the attribute only), we're done! 721 */ 722 if (cfp->cfp_parent == NULL) 723 return (1); 724 725 /* 726 * Check the parent device's name. 727 */ 728 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 729 return (0); /* not the same parent */ 730 731 /* 732 * Make sure the unit number matches. 733 */ 734 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 735 cfp->cfp_unit == parent->dv_unit) 736 return (1); 737 738 /* Unit numbers don't match. */ 739 return (0); 740 } 741 742 /* 743 * Helper for config_cfdata_attach(): check all devices whether it could be 744 * parent any attachment in the config data table passed, and rescan. 745 */ 746 static void 747 rescan_with_cfdata(const struct cfdata *cf) 748 { 749 device_t d; 750 const struct cfdata *cf1; 751 deviter_t di; 752 753 754 /* 755 * "alldevs" is likely longer than an LKM's cfdata, so make it 756 * the outer loop. 757 */ 758 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 759 760 if (!(d->dv_cfattach->ca_rescan)) 761 continue; 762 763 for (cf1 = cf; cf1->cf_name; cf1++) { 764 765 if (!cfparent_match(d, cf1->cf_pspec)) 766 continue; 767 768 (*d->dv_cfattach->ca_rescan)(d, 769 cf1->cf_pspec->cfp_iattr, cf1->cf_loc); 770 } 771 } 772 deviter_release(&di); 773 } 774 775 /* 776 * Attach a supplemental config data table and rescan potential 777 * parent devices if required. 778 */ 779 int 780 config_cfdata_attach(cfdata_t cf, int scannow) 781 { 782 struct cftable *ct; 783 784 ct = malloc(sizeof(struct cftable), M_DEVBUF, M_WAITOK); 785 ct->ct_cfdata = cf; 786 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 787 788 if (scannow) 789 rescan_with_cfdata(cf); 790 791 return (0); 792 } 793 794 /* 795 * Helper for config_cfdata_detach: check whether a device is 796 * found through any attachment in the config data table. 797 */ 798 static int 799 dev_in_cfdata(const struct device *d, const struct cfdata *cf) 800 { 801 const struct cfdata *cf1; 802 803 for (cf1 = cf; cf1->cf_name; cf1++) 804 if (d->dv_cfdata == cf1) 805 return (1); 806 807 return (0); 808 } 809 810 /* 811 * Detach a supplemental config data table. Detach all devices found 812 * through that table (and thus keeping references to it) before. 813 */ 814 int 815 config_cfdata_detach(cfdata_t cf) 816 { 817 device_t d; 818 int error = 0; 819 struct cftable *ct; 820 deviter_t di; 821 822 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 823 d = deviter_next(&di)) { 824 if (!dev_in_cfdata(d, cf)) 825 continue; 826 if ((error = config_detach(d, 0)) != 0) 827 break; 828 } 829 deviter_release(&di); 830 if (error) { 831 aprint_error_dev(d, "unable to detach instance\n"); 832 return error; 833 } 834 835 TAILQ_FOREACH(ct, &allcftables, ct_list) { 836 if (ct->ct_cfdata == cf) { 837 TAILQ_REMOVE(&allcftables, ct, ct_list); 838 free(ct, M_DEVBUF); 839 return (0); 840 } 841 } 842 843 /* not found -- shouldn't happen */ 844 return (EINVAL); 845 } 846 847 /* 848 * Invoke the "match" routine for a cfdata entry on behalf of 849 * an external caller, usually a "submatch" routine. 850 */ 851 int 852 config_match(device_t parent, cfdata_t cf, void *aux) 853 { 854 struct cfattach *ca; 855 856 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 857 if (ca == NULL) { 858 /* No attachment for this entry, oh well. */ 859 return (0); 860 } 861 862 return ((*ca->ca_match)(parent, cf, aux)); 863 } 864 865 /* 866 * Iterate over all potential children of some device, calling the given 867 * function (default being the child's match function) for each one. 868 * Nonzero returns are matches; the highest value returned is considered 869 * the best match. Return the `found child' if we got a match, or NULL 870 * otherwise. The `aux' pointer is simply passed on through. 871 * 872 * Note that this function is designed so that it can be used to apply 873 * an arbitrary function to all potential children (its return value 874 * can be ignored). 875 */ 876 cfdata_t 877 config_search_loc(cfsubmatch_t fn, device_t parent, 878 const char *ifattr, const int *locs, void *aux) 879 { 880 struct cftable *ct; 881 cfdata_t cf; 882 struct matchinfo m; 883 884 KASSERT(config_initialized); 885 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 886 887 m.fn = fn; 888 m.parent = parent; 889 m.locs = locs; 890 m.aux = aux; 891 m.match = NULL; 892 m.pri = 0; 893 894 TAILQ_FOREACH(ct, &allcftables, ct_list) { 895 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 896 897 /* We don't match root nodes here. */ 898 if (!cf->cf_pspec) 899 continue; 900 901 /* 902 * Skip cf if no longer eligible, otherwise scan 903 * through parents for one matching `parent', and 904 * try match function. 905 */ 906 if (cf->cf_fstate == FSTATE_FOUND) 907 continue; 908 if (cf->cf_fstate == FSTATE_DNOTFOUND || 909 cf->cf_fstate == FSTATE_DSTAR) 910 continue; 911 912 /* 913 * If an interface attribute was specified, 914 * consider only children which attach to 915 * that attribute. 916 */ 917 if (ifattr && !STREQ(ifattr, cf->cf_pspec->cfp_iattr)) 918 continue; 919 920 if (cfparent_match(parent, cf->cf_pspec)) 921 mapply(&m, cf); 922 } 923 } 924 return (m.match); 925 } 926 927 cfdata_t 928 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 929 void *aux) 930 { 931 932 return (config_search_loc(fn, parent, ifattr, NULL, aux)); 933 } 934 935 /* 936 * Find the given root device. 937 * This is much like config_search, but there is no parent. 938 * Don't bother with multiple cfdata tables; the root node 939 * must always be in the initial table. 940 */ 941 cfdata_t 942 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 943 { 944 cfdata_t cf; 945 const short *p; 946 struct matchinfo m; 947 948 m.fn = fn; 949 m.parent = ROOT; 950 m.aux = aux; 951 m.match = NULL; 952 m.pri = 0; 953 m.locs = 0; 954 /* 955 * Look at root entries for matching name. We do not bother 956 * with found-state here since only one root should ever be 957 * searched (and it must be done first). 958 */ 959 for (p = cfroots; *p >= 0; p++) { 960 cf = &cfdata[*p]; 961 if (strcmp(cf->cf_name, rootname) == 0) 962 mapply(&m, cf); 963 } 964 return (m.match); 965 } 966 967 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 968 969 /* 970 * The given `aux' argument describes a device that has been found 971 * on the given parent, but not necessarily configured. Locate the 972 * configuration data for that device (using the submatch function 973 * provided, or using candidates' cd_match configuration driver 974 * functions) and attach it, and return true. If the device was 975 * not configured, call the given `print' function and return 0. 976 */ 977 device_t 978 config_found_sm_loc(device_t parent, 979 const char *ifattr, const int *locs, void *aux, 980 cfprint_t print, cfsubmatch_t submatch) 981 { 982 cfdata_t cf; 983 984 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 985 if (splash_progress_state) 986 splash_progress_update(splash_progress_state); 987 #endif 988 989 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 990 return(config_attach_loc(parent, cf, locs, aux, print)); 991 if (print) { 992 if (config_do_twiddle) 993 twiddle(); 994 aprint_normal("%s", msgs[(*print)(aux, parent->dv_xname)]); 995 } 996 997 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 998 if (splash_progress_state) 999 splash_progress_update(splash_progress_state); 1000 #endif 1001 1002 return (NULL); 1003 } 1004 1005 device_t 1006 config_found_ia(device_t parent, const char *ifattr, void *aux, 1007 cfprint_t print) 1008 { 1009 1010 return (config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL)); 1011 } 1012 1013 device_t 1014 config_found(device_t parent, void *aux, cfprint_t print) 1015 { 1016 1017 return (config_found_sm_loc(parent, NULL, NULL, aux, print, NULL)); 1018 } 1019 1020 /* 1021 * As above, but for root devices. 1022 */ 1023 device_t 1024 config_rootfound(const char *rootname, void *aux) 1025 { 1026 cfdata_t cf; 1027 1028 if ((cf = config_rootsearch((cfsubmatch_t)NULL, rootname, aux)) != NULL) 1029 return (config_attach(ROOT, cf, aux, (cfprint_t)NULL)); 1030 aprint_error("root device %s not configured\n", rootname); 1031 return (NULL); 1032 } 1033 1034 /* just like sprintf(buf, "%d") except that it works from the end */ 1035 static char * 1036 number(char *ep, int n) 1037 { 1038 1039 *--ep = 0; 1040 while (n >= 10) { 1041 *--ep = (n % 10) + '0'; 1042 n /= 10; 1043 } 1044 *--ep = n + '0'; 1045 return (ep); 1046 } 1047 1048 /* 1049 * Expand the size of the cd_devs array if necessary. 1050 */ 1051 static void 1052 config_makeroom(int n, struct cfdriver *cd) 1053 { 1054 int old, new; 1055 void **nsp; 1056 1057 if (n < cd->cd_ndevs) 1058 return; 1059 1060 /* 1061 * Need to expand the array. 1062 */ 1063 old = cd->cd_ndevs; 1064 if (old == 0) 1065 new = 4; 1066 else 1067 new = old * 2; 1068 while (new <= n) 1069 new *= 2; 1070 cd->cd_ndevs = new; 1071 nsp = malloc(new * sizeof(void *), M_DEVBUF, 1072 cold ? M_NOWAIT : M_WAITOK); 1073 if (nsp == NULL) 1074 panic("config_attach: %sing dev array", 1075 old != 0 ? "expand" : "creat"); 1076 memset(nsp + old, 0, (new - old) * sizeof(void *)); 1077 if (old != 0) { 1078 memcpy(nsp, cd->cd_devs, old * sizeof(void *)); 1079 free(cd->cd_devs, M_DEVBUF); 1080 } 1081 cd->cd_devs = nsp; 1082 } 1083 1084 static void 1085 config_devlink(device_t dev) 1086 { 1087 struct cfdriver *cd = dev->dv_cfdriver; 1088 1089 /* put this device in the devices array */ 1090 config_makeroom(dev->dv_unit, cd); 1091 if (cd->cd_devs[dev->dv_unit]) 1092 panic("config_attach: duplicate %s", dev->dv_xname); 1093 cd->cd_devs[dev->dv_unit] = dev; 1094 1095 /* It is safe to add a device to the tail of the list while 1096 * readers are in the list, but not while a writer is in 1097 * the list. Wait for any writer to complete. 1098 */ 1099 mutex_enter(&alldevs_mtx); 1100 while (alldevs_nwrite != 0 && alldevs_writer != curlwp) 1101 cv_wait(&alldevs_cv, &alldevs_mtx); 1102 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); /* link up */ 1103 cv_signal(&alldevs_cv); 1104 mutex_exit(&alldevs_mtx); 1105 } 1106 1107 static void 1108 config_devunlink(device_t dev) 1109 { 1110 struct cfdriver *cd = dev->dv_cfdriver; 1111 int i; 1112 1113 /* Unlink from device list. */ 1114 TAILQ_REMOVE(&alldevs, dev, dv_list); 1115 1116 /* Remove from cfdriver's array. */ 1117 cd->cd_devs[dev->dv_unit] = NULL; 1118 1119 /* 1120 * If the device now has no units in use, deallocate its softc array. 1121 */ 1122 for (i = 0; i < cd->cd_ndevs; i++) 1123 if (cd->cd_devs[i] != NULL) 1124 break; 1125 if (i == cd->cd_ndevs) { /* nothing found; deallocate */ 1126 free(cd->cd_devs, M_DEVBUF); 1127 cd->cd_devs = NULL; 1128 cd->cd_ndevs = 0; 1129 } 1130 } 1131 1132 static device_t 1133 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1134 { 1135 struct cfdriver *cd; 1136 struct cfattach *ca; 1137 size_t lname, lunit; 1138 const char *xunit; 1139 int myunit; 1140 char num[10]; 1141 device_t dev; 1142 void *dev_private; 1143 const struct cfiattrdata *ia; 1144 1145 cd = config_cfdriver_lookup(cf->cf_name); 1146 if (cd == NULL) 1147 return (NULL); 1148 1149 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1150 if (ca == NULL) 1151 return (NULL); 1152 1153 if ((ca->ca_flags & DVF_PRIV_ALLOC) == 0 && 1154 ca->ca_devsize < sizeof(struct device)) 1155 panic("config_devalloc: %s", cf->cf_atname); 1156 1157 #ifndef __BROKEN_CONFIG_UNIT_USAGE 1158 if (cf->cf_fstate == FSTATE_STAR) { 1159 for (myunit = cf->cf_unit; myunit < cd->cd_ndevs; myunit++) 1160 if (cd->cd_devs[myunit] == NULL) 1161 break; 1162 /* 1163 * myunit is now the unit of the first NULL device pointer, 1164 * or max(cd->cd_ndevs,cf->cf_unit). 1165 */ 1166 } else { 1167 myunit = cf->cf_unit; 1168 if (myunit < cd->cd_ndevs && cd->cd_devs[myunit] != NULL) 1169 return (NULL); 1170 } 1171 #else 1172 myunit = cf->cf_unit; 1173 #endif /* ! __BROKEN_CONFIG_UNIT_USAGE */ 1174 1175 /* compute length of name and decimal expansion of unit number */ 1176 lname = strlen(cd->cd_name); 1177 xunit = number(&num[sizeof(num)], myunit); 1178 lunit = &num[sizeof(num)] - xunit; 1179 if (lname + lunit > sizeof(dev->dv_xname)) 1180 panic("config_devalloc: device name too long"); 1181 1182 /* get memory for all device vars */ 1183 KASSERT((ca->ca_flags & DVF_PRIV_ALLOC) || ca->ca_devsize >= sizeof(struct device)); 1184 if (ca->ca_devsize > 0) { 1185 dev_private = malloc(ca->ca_devsize, M_DEVBUF, 1186 M_ZERO | (cold ? M_NOWAIT : M_WAITOK)); 1187 if (dev_private == NULL) 1188 panic("config_devalloc: memory allocation for device softc failed"); 1189 } else { 1190 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1191 dev_private = NULL; 1192 } 1193 1194 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1195 dev = malloc(sizeof(struct device), M_DEVBUF, 1196 M_ZERO | (cold ? M_NOWAIT : M_WAITOK)); 1197 } else { 1198 dev = dev_private; 1199 } 1200 if (dev == NULL) 1201 panic("config_devalloc: memory allocation for device_t failed"); 1202 1203 dev->dv_class = cd->cd_class; 1204 dev->dv_cfdata = cf; 1205 dev->dv_cfdriver = cd; 1206 dev->dv_cfattach = ca; 1207 dev->dv_unit = myunit; 1208 dev->dv_activity_count = 0; 1209 dev->dv_activity_handlers = NULL; 1210 dev->dv_private = dev_private; 1211 memcpy(dev->dv_xname, cd->cd_name, lname); 1212 memcpy(dev->dv_xname + lname, xunit, lunit); 1213 dev->dv_parent = parent; 1214 if (parent != NULL) 1215 dev->dv_depth = parent->dv_depth + 1; 1216 else 1217 dev->dv_depth = 0; 1218 dev->dv_flags = DVF_ACTIVE; /* always initially active */ 1219 dev->dv_flags |= ca->ca_flags; /* inherit flags from class */ 1220 if (locs) { 1221 KASSERT(parent); /* no locators at root */ 1222 ia = cfiattr_lookup(cf->cf_pspec->cfp_iattr, 1223 parent->dv_cfdriver); 1224 dev->dv_locators = malloc(ia->ci_loclen * sizeof(int), 1225 M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 1226 memcpy(dev->dv_locators, locs, ia->ci_loclen * sizeof(int)); 1227 } 1228 dev->dv_properties = prop_dictionary_create(); 1229 KASSERT(dev->dv_properties != NULL); 1230 1231 return (dev); 1232 } 1233 1234 static void 1235 config_devdealloc(device_t dev) 1236 { 1237 1238 KASSERT(dev->dv_properties != NULL); 1239 prop_object_release(dev->dv_properties); 1240 1241 if (dev->dv_activity_handlers) 1242 panic("config_devdealloc with registered handlers"); 1243 1244 if (dev->dv_locators) 1245 free(dev->dv_locators, M_DEVBUF); 1246 1247 if ((dev->dv_flags & DVF_PRIV_ALLOC) != 0 && dev->dv_private != NULL) 1248 free(dev->dv_private, M_DEVBUF); 1249 1250 free(dev, M_DEVBUF); 1251 } 1252 1253 /* 1254 * Attach a found device. 1255 */ 1256 device_t 1257 config_attach_loc(device_t parent, cfdata_t cf, 1258 const int *locs, void *aux, cfprint_t print) 1259 { 1260 device_t dev; 1261 struct cftable *ct; 1262 const char *drvname; 1263 1264 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1265 if (splash_progress_state) 1266 splash_progress_update(splash_progress_state); 1267 #endif 1268 1269 dev = config_devalloc(parent, cf, locs); 1270 if (!dev) 1271 panic("config_attach: allocation of device softc failed"); 1272 1273 /* XXX redundant - see below? */ 1274 if (cf->cf_fstate != FSTATE_STAR) { 1275 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1276 cf->cf_fstate = FSTATE_FOUND; 1277 } 1278 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1279 else 1280 cf->cf_unit++; 1281 #endif 1282 1283 config_devlink(dev); 1284 1285 if (config_do_twiddle) 1286 twiddle(); 1287 else 1288 aprint_naive("Found "); 1289 /* 1290 * We want the next two printfs for normal, verbose, and quiet, 1291 * but not silent (in which case, we're twiddling, instead). 1292 */ 1293 if (parent == ROOT) { 1294 aprint_naive("%s (root)", dev->dv_xname); 1295 aprint_normal("%s (root)", dev->dv_xname); 1296 } else { 1297 aprint_naive("%s at %s", dev->dv_xname, parent->dv_xname); 1298 aprint_normal("%s at %s", dev->dv_xname, parent->dv_xname); 1299 if (print) 1300 (void) (*print)(aux, NULL); 1301 } 1302 1303 /* 1304 * Before attaching, clobber any unfound devices that are 1305 * otherwise identical. 1306 * XXX code above is redundant? 1307 */ 1308 drvname = dev->dv_cfdriver->cd_name; 1309 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1310 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1311 if (STREQ(cf->cf_name, drvname) && 1312 cf->cf_unit == dev->dv_unit) { 1313 if (cf->cf_fstate == FSTATE_NOTFOUND) 1314 cf->cf_fstate = FSTATE_FOUND; 1315 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1316 /* 1317 * Bump the unit number on all starred cfdata 1318 * entries for this device. 1319 */ 1320 if (cf->cf_fstate == FSTATE_STAR) 1321 cf->cf_unit++; 1322 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 1323 } 1324 } 1325 } 1326 #ifdef __HAVE_DEVICE_REGISTER 1327 device_register(dev, aux); 1328 #endif 1329 1330 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1331 if (splash_progress_state) 1332 splash_progress_update(splash_progress_state); 1333 #endif 1334 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1335 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1336 if (splash_progress_state) 1337 splash_progress_update(splash_progress_state); 1338 #endif 1339 1340 if (!device_pmf_is_registered(dev)) 1341 aprint_debug_dev(dev, "WARNING: power management not supported\n"); 1342 1343 config_process_deferred(&deferred_config_queue, dev); 1344 return (dev); 1345 } 1346 1347 device_t 1348 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1349 { 1350 1351 return (config_attach_loc(parent, cf, NULL, aux, print)); 1352 } 1353 1354 /* 1355 * As above, but for pseudo-devices. Pseudo-devices attached in this 1356 * way are silently inserted into the device tree, and their children 1357 * attached. 1358 * 1359 * Note that because pseudo-devices are attached silently, any information 1360 * the attach routine wishes to print should be prefixed with the device 1361 * name by the attach routine. 1362 */ 1363 device_t 1364 config_attach_pseudo(cfdata_t cf) 1365 { 1366 device_t dev; 1367 1368 dev = config_devalloc(ROOT, cf, NULL); 1369 if (!dev) 1370 return (NULL); 1371 1372 /* XXX mark busy in cfdata */ 1373 1374 config_devlink(dev); 1375 1376 #if 0 /* XXXJRT not yet */ 1377 #ifdef __HAVE_DEVICE_REGISTER 1378 device_register(dev, NULL); /* like a root node */ 1379 #endif 1380 #endif 1381 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1382 config_process_deferred(&deferred_config_queue, dev); 1383 return (dev); 1384 } 1385 1386 /* 1387 * Detach a device. Optionally forced (e.g. because of hardware 1388 * removal) and quiet. Returns zero if successful, non-zero 1389 * (an error code) otherwise. 1390 * 1391 * Note that this code wants to be run from a process context, so 1392 * that the detach can sleep to allow processes which have a device 1393 * open to run and unwind their stacks. 1394 */ 1395 int 1396 config_detach(device_t dev, int flags) 1397 { 1398 struct cftable *ct; 1399 cfdata_t cf; 1400 const struct cfattach *ca; 1401 struct cfdriver *cd; 1402 #ifdef DIAGNOSTIC 1403 device_t d; 1404 #endif 1405 int rv = 0; 1406 1407 #ifdef DIAGNOSTIC 1408 if (dev->dv_cfdata != NULL && 1409 dev->dv_cfdata->cf_fstate != FSTATE_FOUND && 1410 dev->dv_cfdata->cf_fstate != FSTATE_STAR) 1411 panic("config_detach: bad device fstate"); 1412 #endif 1413 cd = dev->dv_cfdriver; 1414 KASSERT(cd != NULL); 1415 1416 ca = dev->dv_cfattach; 1417 KASSERT(ca != NULL); 1418 1419 KASSERT(curlwp != NULL); 1420 mutex_enter(&alldevs_mtx); 1421 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 1422 ; 1423 else while (alldevs_nread != 0 || 1424 (alldevs_nwrite != 0 && alldevs_writer != curlwp)) 1425 cv_wait(&alldevs_cv, &alldevs_mtx); 1426 if (alldevs_nwrite++ == 0) 1427 alldevs_writer = curlwp; 1428 mutex_exit(&alldevs_mtx); 1429 1430 /* 1431 * Ensure the device is deactivated. If the device doesn't 1432 * have an activation entry point, we allow DVF_ACTIVE to 1433 * remain set. Otherwise, if DVF_ACTIVE is still set, the 1434 * device is busy, and the detach fails. 1435 */ 1436 if (ca->ca_activate != NULL) 1437 rv = config_deactivate(dev); 1438 1439 /* 1440 * Try to detach the device. If that's not possible, then 1441 * we either panic() (for the forced but failed case), or 1442 * return an error. 1443 */ 1444 if (rv == 0) { 1445 if (ca->ca_detach != NULL) 1446 rv = (*ca->ca_detach)(dev, flags); 1447 else 1448 rv = EOPNOTSUPP; 1449 } 1450 if (rv != 0) { 1451 if ((flags & DETACH_FORCE) == 0) 1452 goto out; 1453 else 1454 panic("config_detach: forced detach of %s failed (%d)", 1455 dev->dv_xname, rv); 1456 } 1457 1458 /* 1459 * The device has now been successfully detached. 1460 */ 1461 1462 #ifdef DIAGNOSTIC 1463 /* 1464 * Sanity: If you're successfully detached, you should have no 1465 * children. (Note that because children must be attached 1466 * after parents, we only need to search the latter part of 1467 * the list.) 1468 */ 1469 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1470 d = TAILQ_NEXT(d, dv_list)) { 1471 if (d->dv_parent == dev) { 1472 printf("config_detach: detached device %s" 1473 " has children %s\n", dev->dv_xname, d->dv_xname); 1474 panic("config_detach"); 1475 } 1476 } 1477 #endif 1478 1479 /* notify the parent that the child is gone */ 1480 if (dev->dv_parent) { 1481 device_t p = dev->dv_parent; 1482 if (p->dv_cfattach->ca_childdetached) 1483 (*p->dv_cfattach->ca_childdetached)(p, dev); 1484 } 1485 1486 /* 1487 * Mark cfdata to show that the unit can be reused, if possible. 1488 */ 1489 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1490 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1491 if (STREQ(cf->cf_name, cd->cd_name)) { 1492 if (cf->cf_fstate == FSTATE_FOUND && 1493 cf->cf_unit == dev->dv_unit) 1494 cf->cf_fstate = FSTATE_NOTFOUND; 1495 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1496 /* 1497 * Note that we can only re-use a starred 1498 * unit number if the unit being detached 1499 * had the last assigned unit number. 1500 */ 1501 if (cf->cf_fstate == FSTATE_STAR && 1502 cf->cf_unit == dev->dv_unit + 1) 1503 cf->cf_unit--; 1504 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 1505 } 1506 } 1507 } 1508 1509 config_devunlink(dev); 1510 1511 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1512 aprint_normal_dev(dev, "detached\n"); 1513 1514 config_devdealloc(dev); 1515 1516 out: 1517 mutex_enter(&alldevs_mtx); 1518 if (--alldevs_nwrite == 0) 1519 alldevs_writer = NULL; 1520 cv_signal(&alldevs_cv); 1521 mutex_exit(&alldevs_mtx); 1522 return rv; 1523 } 1524 1525 int 1526 config_detach_children(device_t parent, int flags) 1527 { 1528 device_t dv; 1529 deviter_t di; 1530 int error = 0; 1531 1532 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1533 dv = deviter_next(&di)) { 1534 if (device_parent(dv) != parent) 1535 continue; 1536 if ((error = config_detach(dv, flags)) != 0) 1537 break; 1538 } 1539 deviter_release(&di); 1540 return error; 1541 } 1542 1543 int 1544 config_activate(device_t dev) 1545 { 1546 const struct cfattach *ca = dev->dv_cfattach; 1547 int rv = 0, oflags = dev->dv_flags; 1548 1549 if (ca->ca_activate == NULL) 1550 return (EOPNOTSUPP); 1551 1552 if ((dev->dv_flags & DVF_ACTIVE) == 0) { 1553 dev->dv_flags |= DVF_ACTIVE; 1554 rv = (*ca->ca_activate)(dev, DVACT_ACTIVATE); 1555 if (rv) 1556 dev->dv_flags = oflags; 1557 } 1558 return (rv); 1559 } 1560 1561 int 1562 config_deactivate(device_t dev) 1563 { 1564 const struct cfattach *ca = dev->dv_cfattach; 1565 int rv = 0, oflags = dev->dv_flags; 1566 1567 if (ca->ca_activate == NULL) 1568 return (EOPNOTSUPP); 1569 1570 if (dev->dv_flags & DVF_ACTIVE) { 1571 dev->dv_flags &= ~DVF_ACTIVE; 1572 rv = (*ca->ca_activate)(dev, DVACT_DEACTIVATE); 1573 if (rv) 1574 dev->dv_flags = oflags; 1575 } 1576 return (rv); 1577 } 1578 1579 /* 1580 * Defer the configuration of the specified device until all 1581 * of its parent's devices have been attached. 1582 */ 1583 void 1584 config_defer(device_t dev, void (*func)(device_t)) 1585 { 1586 struct deferred_config *dc; 1587 1588 if (dev->dv_parent == NULL) 1589 panic("config_defer: can't defer config of a root device"); 1590 1591 #ifdef DIAGNOSTIC 1592 for (dc = TAILQ_FIRST(&deferred_config_queue); dc != NULL; 1593 dc = TAILQ_NEXT(dc, dc_queue)) { 1594 if (dc->dc_dev == dev) 1595 panic("config_defer: deferred twice"); 1596 } 1597 #endif 1598 1599 dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 1600 if (dc == NULL) 1601 panic("config_defer: unable to allocate callback"); 1602 1603 dc->dc_dev = dev; 1604 dc->dc_func = func; 1605 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1606 config_pending_incr(); 1607 } 1608 1609 /* 1610 * Defer some autoconfiguration for a device until after interrupts 1611 * are enabled. 1612 */ 1613 void 1614 config_interrupts(device_t dev, void (*func)(device_t)) 1615 { 1616 struct deferred_config *dc; 1617 1618 /* 1619 * If interrupts are enabled, callback now. 1620 */ 1621 if (cold == 0) { 1622 (*func)(dev); 1623 return; 1624 } 1625 1626 #ifdef DIAGNOSTIC 1627 for (dc = TAILQ_FIRST(&interrupt_config_queue); dc != NULL; 1628 dc = TAILQ_NEXT(dc, dc_queue)) { 1629 if (dc->dc_dev == dev) 1630 panic("config_interrupts: deferred twice"); 1631 } 1632 #endif 1633 1634 dc = malloc(sizeof(*dc), M_DEVBUF, cold ? M_NOWAIT : M_WAITOK); 1635 if (dc == NULL) 1636 panic("config_interrupts: unable to allocate callback"); 1637 1638 dc->dc_dev = dev; 1639 dc->dc_func = func; 1640 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 1641 config_pending_incr(); 1642 } 1643 1644 /* 1645 * Process a deferred configuration queue. 1646 */ 1647 static void 1648 config_process_deferred(struct deferred_config_head *queue, 1649 device_t parent) 1650 { 1651 struct deferred_config *dc, *ndc; 1652 1653 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 1654 ndc = TAILQ_NEXT(dc, dc_queue); 1655 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 1656 TAILQ_REMOVE(queue, dc, dc_queue); 1657 (*dc->dc_func)(dc->dc_dev); 1658 free(dc, M_DEVBUF); 1659 config_pending_decr(); 1660 } 1661 } 1662 } 1663 1664 /* 1665 * Manipulate the config_pending semaphore. 1666 */ 1667 void 1668 config_pending_incr(void) 1669 { 1670 1671 config_pending++; 1672 } 1673 1674 void 1675 config_pending_decr(void) 1676 { 1677 1678 #ifdef DIAGNOSTIC 1679 if (config_pending == 0) 1680 panic("config_pending_decr: config_pending == 0"); 1681 #endif 1682 config_pending--; 1683 if (config_pending == 0) 1684 wakeup(&config_pending); 1685 } 1686 1687 /* 1688 * Register a "finalization" routine. Finalization routines are 1689 * called iteratively once all real devices have been found during 1690 * autoconfiguration, for as long as any one finalizer has done 1691 * any work. 1692 */ 1693 int 1694 config_finalize_register(device_t dev, int (*fn)(device_t)) 1695 { 1696 struct finalize_hook *f; 1697 1698 /* 1699 * If finalization has already been done, invoke the 1700 * callback function now. 1701 */ 1702 if (config_finalize_done) { 1703 while ((*fn)(dev) != 0) 1704 /* loop */ ; 1705 } 1706 1707 /* Ensure this isn't already on the list. */ 1708 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 1709 if (f->f_func == fn && f->f_dev == dev) 1710 return (EEXIST); 1711 } 1712 1713 f = malloc(sizeof(*f), M_TEMP, M_WAITOK); 1714 f->f_func = fn; 1715 f->f_dev = dev; 1716 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 1717 1718 return (0); 1719 } 1720 1721 void 1722 config_finalize(void) 1723 { 1724 struct finalize_hook *f; 1725 struct pdevinit *pdev; 1726 extern struct pdevinit pdevinit[]; 1727 int errcnt, rv; 1728 1729 /* 1730 * Now that device driver threads have been created, wait for 1731 * them to finish any deferred autoconfiguration. 1732 */ 1733 while (config_pending) 1734 (void) tsleep(&config_pending, PWAIT, "cfpend", hz); 1735 1736 /* Attach pseudo-devices. */ 1737 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 1738 (*pdev->pdev_attach)(pdev->pdev_count); 1739 1740 /* Run the hooks until none of them does any work. */ 1741 do { 1742 rv = 0; 1743 TAILQ_FOREACH(f, &config_finalize_list, f_list) 1744 rv |= (*f->f_func)(f->f_dev); 1745 } while (rv != 0); 1746 1747 config_finalize_done = 1; 1748 1749 /* Now free all the hooks. */ 1750 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 1751 TAILQ_REMOVE(&config_finalize_list, f, f_list); 1752 free(f, M_TEMP); 1753 } 1754 1755 errcnt = aprint_get_error_count(); 1756 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 1757 (boothowto & AB_VERBOSE) == 0) { 1758 if (config_do_twiddle) { 1759 config_do_twiddle = 0; 1760 printf_nolog("done.\n"); 1761 } 1762 if (errcnt != 0) { 1763 printf("WARNING: %d error%s while detecting hardware; " 1764 "check system log.\n", errcnt, 1765 errcnt == 1 ? "" : "s"); 1766 } 1767 } 1768 } 1769 1770 /* 1771 * device_lookup: 1772 * 1773 * Look up a device instance for a given driver. 1774 */ 1775 void * 1776 device_lookup(cfdriver_t cd, int unit) 1777 { 1778 1779 if (unit < 0 || unit >= cd->cd_ndevs) 1780 return (NULL); 1781 1782 return (cd->cd_devs[unit]); 1783 } 1784 1785 /* 1786 * device_lookup: 1787 * 1788 * Look up a device instance for a given driver. 1789 */ 1790 void * 1791 device_lookup_private(cfdriver_t cd, int unit) 1792 { 1793 device_t dv; 1794 1795 if (unit < 0 || unit >= cd->cd_ndevs) 1796 return NULL; 1797 1798 if ((dv = cd->cd_devs[unit]) == NULL) 1799 return NULL; 1800 1801 return dv->dv_private; 1802 } 1803 1804 /* 1805 * Accessor functions for the device_t type. 1806 */ 1807 devclass_t 1808 device_class(device_t dev) 1809 { 1810 1811 return (dev->dv_class); 1812 } 1813 1814 cfdata_t 1815 device_cfdata(device_t dev) 1816 { 1817 1818 return (dev->dv_cfdata); 1819 } 1820 1821 cfdriver_t 1822 device_cfdriver(device_t dev) 1823 { 1824 1825 return (dev->dv_cfdriver); 1826 } 1827 1828 cfattach_t 1829 device_cfattach(device_t dev) 1830 { 1831 1832 return (dev->dv_cfattach); 1833 } 1834 1835 int 1836 device_unit(device_t dev) 1837 { 1838 1839 return (dev->dv_unit); 1840 } 1841 1842 const char * 1843 device_xname(device_t dev) 1844 { 1845 1846 return (dev->dv_xname); 1847 } 1848 1849 device_t 1850 device_parent(device_t dev) 1851 { 1852 1853 return (dev->dv_parent); 1854 } 1855 1856 bool 1857 device_is_active(device_t dev) 1858 { 1859 int active_flags; 1860 1861 active_flags = DVF_ACTIVE; 1862 active_flags |= DVF_CLASS_SUSPENDED; 1863 active_flags |= DVF_DRIVER_SUSPENDED; 1864 active_flags |= DVF_BUS_SUSPENDED; 1865 1866 return ((dev->dv_flags & active_flags) == DVF_ACTIVE); 1867 } 1868 1869 bool 1870 device_is_enabled(device_t dev) 1871 { 1872 return (dev->dv_flags & DVF_ACTIVE) == DVF_ACTIVE; 1873 } 1874 1875 bool 1876 device_has_power(device_t dev) 1877 { 1878 int active_flags; 1879 1880 active_flags = DVF_ACTIVE | DVF_BUS_SUSPENDED; 1881 1882 return ((dev->dv_flags & active_flags) == DVF_ACTIVE); 1883 } 1884 1885 int 1886 device_locator(device_t dev, u_int locnum) 1887 { 1888 1889 KASSERT(dev->dv_locators != NULL); 1890 return (dev->dv_locators[locnum]); 1891 } 1892 1893 void * 1894 device_private(device_t dev) 1895 { 1896 1897 /* 1898 * The reason why device_private(NULL) is allowed is to simplify the 1899 * work of a lot of userspace request handlers (i.e., c/bdev 1900 * handlers) which grab cfdriver_t->cd_units[n]. 1901 * It avoids having them test for it to be NULL and only then calling 1902 * device_private. 1903 */ 1904 return dev == NULL ? NULL : dev->dv_private; 1905 } 1906 1907 prop_dictionary_t 1908 device_properties(device_t dev) 1909 { 1910 1911 return (dev->dv_properties); 1912 } 1913 1914 /* 1915 * device_is_a: 1916 * 1917 * Returns true if the device is an instance of the specified 1918 * driver. 1919 */ 1920 bool 1921 device_is_a(device_t dev, const char *dname) 1922 { 1923 1924 return (strcmp(dev->dv_cfdriver->cd_name, dname) == 0); 1925 } 1926 1927 /* 1928 * device_find_by_xname: 1929 * 1930 * Returns the device of the given name or NULL if it doesn't exist. 1931 */ 1932 device_t 1933 device_find_by_xname(const char *name) 1934 { 1935 device_t dv; 1936 deviter_t di; 1937 1938 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 1939 if (strcmp(device_xname(dv), name) == 0) 1940 break; 1941 } 1942 deviter_release(&di); 1943 1944 return dv; 1945 } 1946 1947 /* 1948 * device_find_by_driver_unit: 1949 * 1950 * Returns the device of the given driver name and unit or 1951 * NULL if it doesn't exist. 1952 */ 1953 device_t 1954 device_find_by_driver_unit(const char *name, int unit) 1955 { 1956 struct cfdriver *cd; 1957 1958 if ((cd = config_cfdriver_lookup(name)) == NULL) 1959 return NULL; 1960 return device_lookup(cd, unit); 1961 } 1962 1963 /* 1964 * Power management related functions. 1965 */ 1966 1967 bool 1968 device_pmf_is_registered(device_t dev) 1969 { 1970 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 1971 } 1972 1973 bool 1974 device_pmf_driver_suspend(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_CLASS_SUSPENDED) == 0) 1979 return false; 1980 if (*dev->dv_driver_suspend != NULL && 1981 !(*dev->dv_driver_suspend)(dev PMF_FN_CALL)) 1982 return false; 1983 1984 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 1985 return true; 1986 } 1987 1988 bool 1989 device_pmf_driver_resume(device_t dev PMF_FN_ARGS) 1990 { 1991 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 1992 return true; 1993 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 1994 return false; 1995 if ((flags & PMF_F_SELF) != 0 && !device_is_self_suspended(dev)) 1996 return false; 1997 if (*dev->dv_driver_resume != NULL && 1998 !(*dev->dv_driver_resume)(dev PMF_FN_CALL)) 1999 return false; 2000 2001 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2002 return true; 2003 } 2004 2005 bool 2006 device_pmf_driver_shutdown(device_t dev, int how) 2007 { 2008 2009 if (*dev->dv_driver_shutdown != NULL && 2010 !(*dev->dv_driver_shutdown)(dev, how)) 2011 return false; 2012 return true; 2013 } 2014 2015 bool 2016 device_pmf_driver_register(device_t dev, 2017 bool (*suspend)(device_t PMF_FN_PROTO), 2018 bool (*resume)(device_t PMF_FN_PROTO), 2019 bool (*shutdown)(device_t, int)) 2020 { 2021 pmf_private_t *pp; 2022 2023 if ((pp = malloc(sizeof(*pp), M_PMFPRIV, M_NOWAIT|M_ZERO)) == NULL) 2024 return false; 2025 mutex_init(&pp->pp_mtx, MUTEX_DEFAULT, IPL_NONE); 2026 cv_init(&pp->pp_cv, "pmfsusp"); 2027 dev->dv_pmf_private = pp; 2028 2029 dev->dv_driver_suspend = suspend; 2030 dev->dv_driver_resume = resume; 2031 dev->dv_driver_shutdown = shutdown; 2032 dev->dv_flags |= DVF_POWER_HANDLERS; 2033 return true; 2034 } 2035 2036 static const char * 2037 curlwp_name(void) 2038 { 2039 if (curlwp->l_name != NULL) 2040 return curlwp->l_name; 2041 else 2042 return curlwp->l_proc->p_comm; 2043 } 2044 2045 void 2046 device_pmf_driver_deregister(device_t dev) 2047 { 2048 pmf_private_t *pp = dev->dv_pmf_private; 2049 2050 dev->dv_driver_suspend = NULL; 2051 dev->dv_driver_resume = NULL; 2052 2053 dev->dv_pmf_private = NULL; 2054 2055 mutex_enter(&pp->pp_mtx); 2056 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2057 while (pp->pp_nlock > 0 || pp->pp_nwait > 0) { 2058 /* Wake a thread that waits for the lock. That 2059 * thread will fail to acquire the lock, and then 2060 * it will wake the next thread that waits for the 2061 * lock, or else it will wake us. 2062 */ 2063 cv_signal(&pp->pp_cv); 2064 pmflock_debug(dev, __func__, __LINE__); 2065 cv_wait(&pp->pp_cv, &pp->pp_mtx); 2066 pmflock_debug(dev, __func__, __LINE__); 2067 } 2068 mutex_exit(&pp->pp_mtx); 2069 2070 cv_destroy(&pp->pp_cv); 2071 mutex_destroy(&pp->pp_mtx); 2072 free(pp, M_PMFPRIV); 2073 } 2074 2075 bool 2076 device_pmf_driver_child_register(device_t dev) 2077 { 2078 device_t parent = device_parent(dev); 2079 2080 if (parent == NULL || parent->dv_driver_child_register == NULL) 2081 return true; 2082 return (*parent->dv_driver_child_register)(dev); 2083 } 2084 2085 void 2086 device_pmf_driver_set_child_register(device_t dev, 2087 bool (*child_register)(device_t)) 2088 { 2089 dev->dv_driver_child_register = child_register; 2090 } 2091 2092 void 2093 device_pmf_self_resume(device_t dev PMF_FN_ARGS) 2094 { 2095 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2096 if ((dev->dv_flags & DVF_SELF_SUSPENDED) != 0) 2097 dev->dv_flags &= ~DVF_SELF_SUSPENDED; 2098 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2099 } 2100 2101 bool 2102 device_is_self_suspended(device_t dev) 2103 { 2104 return (dev->dv_flags & DVF_SELF_SUSPENDED) != 0; 2105 } 2106 2107 void 2108 device_pmf_self_suspend(device_t dev PMF_FN_ARGS) 2109 { 2110 bool self = (flags & PMF_F_SELF) != 0; 2111 2112 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2113 2114 if (!self) 2115 dev->dv_flags &= ~DVF_SELF_SUSPENDED; 2116 else if (device_is_active(dev)) 2117 dev->dv_flags |= DVF_SELF_SUSPENDED; 2118 2119 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2120 } 2121 2122 static void 2123 pmflock_debug(device_t dev, const char *func, int line) 2124 { 2125 pmf_private_t *pp = device_pmf_private(dev); 2126 2127 aprint_debug_dev(dev, "%s.%d, %s pp_nlock %d pp_nwait %d dv_flags %x\n", 2128 func, line, curlwp_name(), pp->pp_nlock, pp->pp_nwait, 2129 dev->dv_flags); 2130 } 2131 2132 static void 2133 pmflock_debug_with_flags(device_t dev, const char *func, int line PMF_FN_ARGS) 2134 { 2135 pmf_private_t *pp = device_pmf_private(dev); 2136 2137 aprint_debug_dev(dev, "%s.%d, %s pp_nlock %d pp_nwait %d dv_flags %x " 2138 "flags " PMF_FLAGS_FMT "\n", func, line, curlwp_name(), 2139 pp->pp_nlock, pp->pp_nwait, dev->dv_flags PMF_FN_CALL); 2140 } 2141 2142 static bool 2143 device_pmf_lock1(device_t dev PMF_FN_ARGS) 2144 { 2145 pmf_private_t *pp = device_pmf_private(dev); 2146 2147 while (pp->pp_nlock > 0 && pp->pp_holder != curlwp && 2148 device_pmf_is_registered(dev)) { 2149 pp->pp_nwait++; 2150 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2151 cv_wait(&pp->pp_cv, &pp->pp_mtx); 2152 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2153 pp->pp_nwait--; 2154 } 2155 if (!device_pmf_is_registered(dev)) { 2156 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2157 /* We could not acquire the lock, but some other thread may 2158 * wait for it, also. Wake that thread. 2159 */ 2160 cv_signal(&pp->pp_cv); 2161 return false; 2162 } 2163 pp->pp_nlock++; 2164 pp->pp_holder = curlwp; 2165 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2166 return true; 2167 } 2168 2169 bool 2170 device_pmf_lock(device_t dev PMF_FN_ARGS) 2171 { 2172 bool rc; 2173 pmf_private_t *pp = device_pmf_private(dev); 2174 2175 mutex_enter(&pp->pp_mtx); 2176 rc = device_pmf_lock1(dev PMF_FN_CALL); 2177 mutex_exit(&pp->pp_mtx); 2178 2179 return rc; 2180 } 2181 2182 void 2183 device_pmf_unlock(device_t dev PMF_FN_ARGS) 2184 { 2185 pmf_private_t *pp = device_pmf_private(dev); 2186 2187 KASSERT(pp->pp_nlock > 0); 2188 mutex_enter(&pp->pp_mtx); 2189 if (--pp->pp_nlock == 0) 2190 pp->pp_holder = NULL; 2191 cv_signal(&pp->pp_cv); 2192 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2193 mutex_exit(&pp->pp_mtx); 2194 } 2195 2196 void * 2197 device_pmf_private(device_t dev) 2198 { 2199 return dev->dv_pmf_private; 2200 } 2201 2202 void * 2203 device_pmf_bus_private(device_t dev) 2204 { 2205 return dev->dv_bus_private; 2206 } 2207 2208 bool 2209 device_pmf_bus_suspend(device_t dev PMF_FN_ARGS) 2210 { 2211 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2212 return true; 2213 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2214 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2215 return false; 2216 if (*dev->dv_bus_suspend != NULL && 2217 !(*dev->dv_bus_suspend)(dev PMF_FN_CALL)) 2218 return false; 2219 2220 dev->dv_flags |= DVF_BUS_SUSPENDED; 2221 return true; 2222 } 2223 2224 bool 2225 device_pmf_bus_resume(device_t dev PMF_FN_ARGS) 2226 { 2227 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2228 return true; 2229 if ((flags & PMF_F_SELF) != 0 && !device_is_self_suspended(dev)) 2230 return false; 2231 if (*dev->dv_bus_resume != NULL && 2232 !(*dev->dv_bus_resume)(dev PMF_FN_CALL)) 2233 return false; 2234 2235 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2236 return true; 2237 } 2238 2239 bool 2240 device_pmf_bus_shutdown(device_t dev, int how) 2241 { 2242 2243 if (*dev->dv_bus_shutdown != NULL && 2244 !(*dev->dv_bus_shutdown)(dev, how)) 2245 return false; 2246 return true; 2247 } 2248 2249 void 2250 device_pmf_bus_register(device_t dev, void *priv, 2251 bool (*suspend)(device_t PMF_FN_PROTO), 2252 bool (*resume)(device_t PMF_FN_PROTO), 2253 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2254 { 2255 dev->dv_bus_private = priv; 2256 dev->dv_bus_resume = resume; 2257 dev->dv_bus_suspend = suspend; 2258 dev->dv_bus_shutdown = shutdown; 2259 dev->dv_bus_deregister = deregister; 2260 } 2261 2262 void 2263 device_pmf_bus_deregister(device_t dev) 2264 { 2265 if (dev->dv_bus_deregister == NULL) 2266 return; 2267 (*dev->dv_bus_deregister)(dev); 2268 dev->dv_bus_private = NULL; 2269 dev->dv_bus_suspend = NULL; 2270 dev->dv_bus_resume = NULL; 2271 dev->dv_bus_deregister = NULL; 2272 } 2273 2274 void * 2275 device_pmf_class_private(device_t dev) 2276 { 2277 return dev->dv_class_private; 2278 } 2279 2280 bool 2281 device_pmf_class_suspend(device_t dev PMF_FN_ARGS) 2282 { 2283 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2284 return true; 2285 if (*dev->dv_class_suspend != NULL && 2286 !(*dev->dv_class_suspend)(dev PMF_FN_CALL)) 2287 return false; 2288 2289 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2290 return true; 2291 } 2292 2293 bool 2294 device_pmf_class_resume(device_t dev PMF_FN_ARGS) 2295 { 2296 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2297 return true; 2298 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2299 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2300 return false; 2301 if (*dev->dv_class_resume != NULL && 2302 !(*dev->dv_class_resume)(dev PMF_FN_CALL)) 2303 return false; 2304 2305 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2306 return true; 2307 } 2308 2309 void 2310 device_pmf_class_register(device_t dev, void *priv, 2311 bool (*suspend)(device_t PMF_FN_PROTO), 2312 bool (*resume)(device_t PMF_FN_PROTO), 2313 void (*deregister)(device_t)) 2314 { 2315 dev->dv_class_private = priv; 2316 dev->dv_class_suspend = suspend; 2317 dev->dv_class_resume = resume; 2318 dev->dv_class_deregister = deregister; 2319 } 2320 2321 void 2322 device_pmf_class_deregister(device_t dev) 2323 { 2324 if (dev->dv_class_deregister == NULL) 2325 return; 2326 (*dev->dv_class_deregister)(dev); 2327 dev->dv_class_private = NULL; 2328 dev->dv_class_suspend = NULL; 2329 dev->dv_class_resume = NULL; 2330 dev->dv_class_deregister = NULL; 2331 } 2332 2333 bool 2334 device_active(device_t dev, devactive_t type) 2335 { 2336 size_t i; 2337 2338 if (dev->dv_activity_count == 0) 2339 return false; 2340 2341 for (i = 0; i < dev->dv_activity_count; ++i) 2342 (*dev->dv_activity_handlers[i])(dev, type); 2343 2344 return true; 2345 } 2346 2347 bool 2348 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2349 { 2350 void (**new_handlers)(device_t, devactive_t); 2351 void (**old_handlers)(device_t, devactive_t); 2352 size_t i, new_size; 2353 int s; 2354 2355 old_handlers = dev->dv_activity_handlers; 2356 2357 for (i = 0; i < dev->dv_activity_count; ++i) { 2358 if (old_handlers[i] == handler) 2359 panic("Double registering of idle handlers"); 2360 } 2361 2362 new_size = dev->dv_activity_count + 1; 2363 new_handlers = malloc(sizeof(void *) * new_size, M_DEVBUF, M_WAITOK); 2364 2365 memcpy(new_handlers, old_handlers, 2366 sizeof(void *) * dev->dv_activity_count); 2367 new_handlers[new_size - 1] = handler; 2368 2369 s = splhigh(); 2370 dev->dv_activity_count = new_size; 2371 dev->dv_activity_handlers = new_handlers; 2372 splx(s); 2373 2374 if (old_handlers != NULL) 2375 free(old_handlers, M_DEVBUF); 2376 2377 return true; 2378 } 2379 2380 void 2381 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2382 { 2383 void (**new_handlers)(device_t, devactive_t); 2384 void (**old_handlers)(device_t, devactive_t); 2385 size_t i, new_size; 2386 int s; 2387 2388 old_handlers = dev->dv_activity_handlers; 2389 2390 for (i = 0; i < dev->dv_activity_count; ++i) { 2391 if (old_handlers[i] == handler) 2392 break; 2393 } 2394 2395 if (i == dev->dv_activity_count) 2396 return; /* XXX panic? */ 2397 2398 new_size = dev->dv_activity_count - 1; 2399 2400 if (new_size == 0) { 2401 new_handlers = NULL; 2402 } else { 2403 new_handlers = malloc(sizeof(void *) * new_size, M_DEVBUF, 2404 M_WAITOK); 2405 memcpy(new_handlers, old_handlers, sizeof(void *) * i); 2406 memcpy(new_handlers + i, old_handlers + i + 1, 2407 sizeof(void *) * (new_size - i)); 2408 } 2409 2410 s = splhigh(); 2411 dev->dv_activity_count = new_size; 2412 dev->dv_activity_handlers = new_handlers; 2413 splx(s); 2414 2415 free(old_handlers, M_DEVBUF); 2416 } 2417 2418 /* 2419 * Device Iteration 2420 * 2421 * deviter_t: a device iterator. Holds state for a "walk" visiting 2422 * each device_t's in the device tree. 2423 * 2424 * deviter_init(di, flags): initialize the device iterator `di' 2425 * to "walk" the device tree. deviter_next(di) will return 2426 * the first device_t in the device tree, or NULL if there are 2427 * no devices. 2428 * 2429 * `flags' is one or more of DEVITER_F_RW, indicating that the 2430 * caller intends to modify the device tree by calling 2431 * config_detach(9) on devices in the order that the iterator 2432 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2433 * nearest the "root" of the device tree to be returned, first; 2434 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2435 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2436 * indicating both that deviter_init() should not respect any 2437 * locks on the device tree, and that deviter_next(di) may run 2438 * in more than one LWP before the walk has finished. 2439 * 2440 * Only one DEVITER_F_RW iterator may be in the device tree at 2441 * once. 2442 * 2443 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2444 * 2445 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2446 * DEVITER_F_LEAVES_FIRST are used in combination. 2447 * 2448 * deviter_first(di, flags): initialize the device iterator `di' 2449 * and return the first device_t in the device tree, or NULL 2450 * if there are no devices. The statement 2451 * 2452 * dv = deviter_first(di); 2453 * 2454 * is shorthand for 2455 * 2456 * deviter_init(di); 2457 * dv = deviter_next(di); 2458 * 2459 * deviter_next(di): return the next device_t in the device tree, 2460 * or NULL if there are no more devices. deviter_next(di) 2461 * is undefined if `di' was not initialized with deviter_init() or 2462 * deviter_first(). 2463 * 2464 * deviter_release(di): stops iteration (subsequent calls to 2465 * deviter_next() will return NULL), releases any locks and 2466 * resources held by the device iterator. 2467 * 2468 * Device iteration does not return device_t's in any particular 2469 * order. An iterator will never return the same device_t twice. 2470 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2471 * is called repeatedly on the same `di', it will eventually return 2472 * NULL. It is ok to attach/detach devices during device iteration. 2473 */ 2474 void 2475 deviter_init(deviter_t *di, deviter_flags_t flags) 2476 { 2477 device_t dv; 2478 bool rw; 2479 2480 mutex_enter(&alldevs_mtx); 2481 if ((flags & DEVITER_F_SHUTDOWN) != 0) { 2482 flags |= DEVITER_F_RW; 2483 alldevs_nwrite++; 2484 alldevs_writer = NULL; 2485 alldevs_nread = 0; 2486 } else { 2487 rw = (flags & DEVITER_F_RW) != 0; 2488 2489 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 2490 ; 2491 else while ((alldevs_nwrite != 0 && alldevs_writer != curlwp) || 2492 (rw && alldevs_nread != 0)) 2493 cv_wait(&alldevs_cv, &alldevs_mtx); 2494 2495 if (rw) { 2496 if (alldevs_nwrite++ == 0) 2497 alldevs_writer = curlwp; 2498 } else 2499 alldevs_nread++; 2500 } 2501 mutex_exit(&alldevs_mtx); 2502 2503 memset(di, 0, sizeof(*di)); 2504 2505 di->di_flags = flags; 2506 2507 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2508 case DEVITER_F_LEAVES_FIRST: 2509 TAILQ_FOREACH(dv, &alldevs, dv_list) 2510 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2511 break; 2512 case DEVITER_F_ROOT_FIRST: 2513 TAILQ_FOREACH(dv, &alldevs, dv_list) 2514 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2515 break; 2516 default: 2517 break; 2518 } 2519 2520 deviter_reinit(di); 2521 } 2522 2523 static void 2524 deviter_reinit(deviter_t *di) 2525 { 2526 if ((di->di_flags & DEVITER_F_RW) != 0) 2527 di->di_prev = TAILQ_LAST(&alldevs, devicelist); 2528 else 2529 di->di_prev = TAILQ_FIRST(&alldevs); 2530 } 2531 2532 device_t 2533 deviter_first(deviter_t *di, deviter_flags_t flags) 2534 { 2535 deviter_init(di, flags); 2536 return deviter_next(di); 2537 } 2538 2539 static device_t 2540 deviter_next1(deviter_t *di) 2541 { 2542 device_t dv; 2543 2544 dv = di->di_prev; 2545 2546 if (dv == NULL) 2547 ; 2548 else if ((di->di_flags & DEVITER_F_RW) != 0) 2549 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2550 else 2551 di->di_prev = TAILQ_NEXT(dv, dv_list); 2552 2553 return dv; 2554 } 2555 2556 device_t 2557 deviter_next(deviter_t *di) 2558 { 2559 device_t dv = NULL; 2560 2561 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2562 case 0: 2563 return deviter_next1(di); 2564 case DEVITER_F_LEAVES_FIRST: 2565 while (di->di_curdepth >= 0) { 2566 if ((dv = deviter_next1(di)) == NULL) { 2567 di->di_curdepth--; 2568 deviter_reinit(di); 2569 } else if (dv->dv_depth == di->di_curdepth) 2570 break; 2571 } 2572 return dv; 2573 case DEVITER_F_ROOT_FIRST: 2574 while (di->di_curdepth <= di->di_maxdepth) { 2575 if ((dv = deviter_next1(di)) == NULL) { 2576 di->di_curdepth++; 2577 deviter_reinit(di); 2578 } else if (dv->dv_depth == di->di_curdepth) 2579 break; 2580 } 2581 return dv; 2582 default: 2583 return NULL; 2584 } 2585 } 2586 2587 void 2588 deviter_release(deviter_t *di) 2589 { 2590 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 2591 2592 mutex_enter(&alldevs_mtx); 2593 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 2594 --alldevs_nwrite; 2595 else { 2596 2597 if (rw) { 2598 if (--alldevs_nwrite == 0) 2599 alldevs_writer = NULL; 2600 } else 2601 --alldevs_nread; 2602 2603 cv_signal(&alldevs_cv); 2604 } 2605 mutex_exit(&alldevs_mtx); 2606 } 2607
Indexes created Fri Sep 26 08:10:20 GMT 2025