subr_autoconf.c revision 1.170
1 /* $NetBSD: subr_autoconf.c,v 1.170 2009/03/25 21:28:50 dyoung 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 1.170 2009/03/25 21:28:50 dyoung Exp $"); 81 82 #include "opt_ddb.h" 83 #include "drvctl.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/kmem.h> 92 #include <sys/systm.h> 93 #include <sys/kernel.h> 94 #include <sys/errno.h> 95 #include <sys/proc.h> 96 #include <sys/reboot.h> 97 #include <sys/kthread.h> 98 #include <sys/buf.h> 99 #include <sys/dirent.h> 100 #include <sys/vnode.h> 101 #include <sys/mount.h> 102 #include <sys/namei.h> 103 #include <sys/unistd.h> 104 #include <sys/fcntl.h> 105 #include <sys/lockf.h> 106 #include <sys/callout.h> 107 #include <sys/mutex.h> 108 #include <sys/condvar.h> 109 #include <sys/devmon.h> 110 #include <sys/cpu.h> 111 112 #include <sys/disk.h> 113 114 #include <machine/limits.h> 115 116 #include "opt_userconf.h" 117 #ifdef USERCONF 118 #include <sys/userconf.h> 119 #endif 120 121 #ifdef __i386__ 122 #include "opt_splash.h" 123 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 124 #include <dev/splash/splash.h> 125 extern struct splash_progress *splash_progress_state; 126 #endif 127 #endif 128 129 /* 130 * Autoconfiguration subroutines. 131 */ 132 133 typedef struct pmf_private { 134 int pp_nwait; 135 int pp_nlock; 136 lwp_t *pp_holder; 137 kmutex_t pp_mtx; 138 kcondvar_t pp_cv; 139 } pmf_private_t; 140 141 /* 142 * ioconf.c exports exactly two names: cfdata and cfroots. All system 143 * devices and drivers are found via these tables. 144 */ 145 extern struct cfdata cfdata[]; 146 extern const short cfroots[]; 147 148 /* 149 * List of all cfdriver structures. We use this to detect duplicates 150 * when other cfdrivers are loaded. 151 */ 152 struct cfdriverlist allcfdrivers = LIST_HEAD_INITIALIZER(&allcfdrivers); 153 extern struct cfdriver * const cfdriver_list_initial[]; 154 155 /* 156 * Initial list of cfattach's. 157 */ 158 extern const struct cfattachinit cfattachinit[]; 159 160 /* 161 * List of cfdata tables. We always have one such list -- the one 162 * built statically when the kernel was configured. 163 */ 164 struct cftablelist allcftables = TAILQ_HEAD_INITIALIZER(allcftables); 165 static struct cftable initcftable; 166 167 #define ROOT ((device_t)NULL) 168 169 struct matchinfo { 170 cfsubmatch_t fn; 171 struct device *parent; 172 const int *locs; 173 void *aux; 174 struct cfdata *match; 175 int pri; 176 }; 177 178 static char *number(char *, int); 179 static void mapply(struct matchinfo *, cfdata_t); 180 static device_t config_devalloc(const device_t, const cfdata_t, const int *); 181 static void config_devdealloc(device_t); 182 static void config_makeroom(int, struct cfdriver *); 183 static void config_devlink(device_t); 184 static void config_devunlink(device_t); 185 186 static void pmflock_debug(device_t, const char *, int); 187 static void pmflock_debug_with_flags(device_t, const char *, int PMF_FN_PROTO); 188 189 static device_t deviter_next1(deviter_t *); 190 static void deviter_reinit(deviter_t *); 191 192 struct deferred_config { 193 TAILQ_ENTRY(deferred_config) dc_queue; 194 device_t dc_dev; 195 void (*dc_func)(device_t); 196 }; 197 198 TAILQ_HEAD(deferred_config_head, deferred_config); 199 200 struct deferred_config_head deferred_config_queue = 201 TAILQ_HEAD_INITIALIZER(deferred_config_queue); 202 struct deferred_config_head interrupt_config_queue = 203 TAILQ_HEAD_INITIALIZER(interrupt_config_queue); 204 int interrupt_config_threads = 8; 205 206 static void config_process_deferred(struct deferred_config_head *, device_t); 207 208 /* Hooks to finalize configuration once all real devices have been found. */ 209 struct finalize_hook { 210 TAILQ_ENTRY(finalize_hook) f_list; 211 int (*f_func)(device_t); 212 device_t f_dev; 213 }; 214 static TAILQ_HEAD(, finalize_hook) config_finalize_list = 215 TAILQ_HEAD_INITIALIZER(config_finalize_list); 216 static int config_finalize_done; 217 218 /* list of all devices */ 219 struct devicelist alldevs = TAILQ_HEAD_INITIALIZER(alldevs); 220 kcondvar_t alldevs_cv; 221 kmutex_t alldevs_mtx; 222 static int alldevs_nread = 0; 223 static int alldevs_nwrite = 0; 224 static lwp_t *alldevs_writer = NULL; 225 226 static int config_pending; /* semaphore for mountroot */ 227 static kmutex_t config_misc_lock; 228 static kcondvar_t config_misc_cv; 229 230 #define STREQ(s1, s2) \ 231 (*(s1) == *(s2) && strcmp((s1), (s2)) == 0) 232 233 static int config_initialized; /* config_init() has been called. */ 234 235 static int config_do_twiddle; 236 237 struct vnode * 238 opendisk(struct device *dv) 239 { 240 int bmajor, bminor; 241 struct vnode *tmpvn; 242 int error; 243 dev_t dev; 244 245 /* 246 * Lookup major number for disk block device. 247 */ 248 bmajor = devsw_name2blk(device_xname(dv), NULL, 0); 249 if (bmajor == -1) 250 return NULL; 251 252 bminor = minor(device_unit(dv)); 253 /* 254 * Fake a temporary vnode for the disk, open it, and read 255 * and hash the sectors. 256 */ 257 dev = device_is_a(dv, "dk") ? makedev(bmajor, bminor) : 258 MAKEDISKDEV(bmajor, bminor, RAW_PART); 259 if (bdevvp(dev, &tmpvn)) 260 panic("%s: can't alloc vnode for %s", __func__, 261 device_xname(dv)); 262 error = VOP_OPEN(tmpvn, FREAD, NOCRED); 263 if (error) { 264 #ifndef DEBUG 265 /* 266 * Ignore errors caused by missing device, partition, 267 * or medium. 268 */ 269 if (error != ENXIO && error != ENODEV) 270 #endif 271 printf("%s: can't open dev %s (%d)\n", 272 __func__, device_xname(dv), error); 273 vput(tmpvn); 274 return NULL; 275 } 276 277 return tmpvn; 278 } 279 280 int 281 config_handle_wedges(struct device *dv, int par) 282 { 283 struct dkwedge_list wl; 284 struct dkwedge_info *wi; 285 struct vnode *vn; 286 char diskname[16]; 287 int i, error; 288 289 if ((vn = opendisk(dv)) == NULL) 290 return -1; 291 292 wl.dkwl_bufsize = sizeof(*wi) * 16; 293 wl.dkwl_buf = wi = malloc(wl.dkwl_bufsize, M_TEMP, M_WAITOK); 294 295 error = VOP_IOCTL(vn, DIOCLWEDGES, &wl, FREAD, NOCRED); 296 VOP_CLOSE(vn, FREAD, NOCRED); 297 vput(vn); 298 if (error) { 299 #ifdef DEBUG_WEDGE 300 printf("%s: List wedges returned %d\n", 301 device_xname(dv), error); 302 #endif 303 free(wi, M_TEMP); 304 return -1; 305 } 306 307 #ifdef DEBUG_WEDGE 308 printf("%s: Returned %u(%u) wedges\n", device_xname(dv), 309 wl.dkwl_nwedges, wl.dkwl_ncopied); 310 #endif 311 snprintf(diskname, sizeof(diskname), "%s%c", device_xname(dv), 312 par + 'a'); 313 314 for (i = 0; i < wl.dkwl_ncopied; i++) { 315 #ifdef DEBUG_WEDGE 316 printf("%s: Looking for %s in %s\n", 317 device_xname(dv), diskname, wi[i].dkw_wname); 318 #endif 319 if (strcmp(wi[i].dkw_wname, diskname) == 0) 320 break; 321 } 322 323 if (i == wl.dkwl_ncopied) { 324 #ifdef DEBUG_WEDGE 325 printf("%s: Cannot find wedge with parent %s\n", 326 device_xname(dv), diskname); 327 #endif 328 free(wi, M_TEMP); 329 return -1; 330 } 331 332 #ifdef DEBUG_WEDGE 333 printf("%s: Setting boot wedge %s (%s) at %llu %llu\n", 334 device_xname(dv), wi[i].dkw_devname, wi[i].dkw_wname, 335 (unsigned long long)wi[i].dkw_offset, 336 (unsigned long long)wi[i].dkw_size); 337 #endif 338 dkwedge_set_bootwedge(dv, wi[i].dkw_offset, wi[i].dkw_size); 339 free(wi, M_TEMP); 340 return 0; 341 } 342 343 /* 344 * Initialize the autoconfiguration data structures. Normally this 345 * is done by configure(), but some platforms need to do this very 346 * early (to e.g. initialize the console). 347 */ 348 void 349 config_init(void) 350 { 351 const struct cfattachinit *cfai; 352 int i, j; 353 354 if (config_initialized) 355 return; 356 357 mutex_init(&alldevs_mtx, MUTEX_DEFAULT, IPL_NONE); 358 cv_init(&alldevs_cv, "alldevs"); 359 360 mutex_init(&config_misc_lock, MUTEX_DEFAULT, IPL_NONE); 361 cv_init(&config_misc_cv, "cfgmisc"); 362 363 /* allcfdrivers is statically initialized. */ 364 for (i = 0; cfdriver_list_initial[i] != NULL; i++) { 365 if (config_cfdriver_attach(cfdriver_list_initial[i]) != 0) 366 panic("configure: duplicate `%s' drivers", 367 cfdriver_list_initial[i]->cd_name); 368 } 369 370 for (cfai = &cfattachinit[0]; cfai->cfai_name != NULL; cfai++) { 371 for (j = 0; cfai->cfai_list[j] != NULL; j++) { 372 if (config_cfattach_attach(cfai->cfai_name, 373 cfai->cfai_list[j]) != 0) 374 panic("configure: duplicate `%s' attachment " 375 "of `%s' driver", 376 cfai->cfai_list[j]->ca_name, 377 cfai->cfai_name); 378 } 379 } 380 381 initcftable.ct_cfdata = cfdata; 382 TAILQ_INSERT_TAIL(&allcftables, &initcftable, ct_list); 383 384 config_initialized = 1; 385 } 386 387 void 388 config_deferred(device_t dev) 389 { 390 config_process_deferred(&deferred_config_queue, dev); 391 config_process_deferred(&interrupt_config_queue, dev); 392 } 393 394 static void 395 config_interrupts_thread(void *cookie) 396 { 397 struct deferred_config *dc; 398 399 while ((dc = TAILQ_FIRST(&interrupt_config_queue)) != NULL) { 400 TAILQ_REMOVE(&interrupt_config_queue, dc, dc_queue); 401 (*dc->dc_func)(dc->dc_dev); 402 kmem_free(dc, sizeof(*dc)); 403 config_pending_decr(); 404 } 405 kthread_exit(0); 406 } 407 408 /* 409 * Configure the system's hardware. 410 */ 411 void 412 configure(void) 413 { 414 /* Initialize data structures. */ 415 config_init(); 416 pmf_init(); 417 #if NDRVCTL > 0 418 drvctl_init(); 419 #endif 420 421 #ifdef USERCONF 422 if (boothowto & RB_USERCONF) 423 user_config(); 424 #endif 425 426 if ((boothowto & (AB_SILENT|AB_VERBOSE)) == AB_SILENT) { 427 config_do_twiddle = 1; 428 printf_nolog("Detecting hardware..."); 429 } 430 431 /* 432 * Do the machine-dependent portion of autoconfiguration. This 433 * sets the configuration machinery here in motion by "finding" 434 * the root bus. When this function returns, we expect interrupts 435 * to be enabled. 436 */ 437 cpu_configure(); 438 } 439 440 void 441 configure2(void) 442 { 443 CPU_INFO_ITERATOR cii; 444 struct cpu_info *ci; 445 int i, s; 446 447 /* 448 * Now that we've found all the hardware, start the real time 449 * and statistics clocks. 450 */ 451 initclocks(); 452 453 cold = 0; /* clocks are running, we're warm now! */ 454 s = splsched(); 455 curcpu()->ci_schedstate.spc_flags |= SPCF_RUNNING; 456 splx(s); 457 458 /* Boot the secondary processors. */ 459 for (CPU_INFO_FOREACH(cii, ci)) { 460 uvm_cpu_attach(ci); 461 } 462 mp_online = true; 463 #if defined(MULTIPROCESSOR) 464 cpu_boot_secondary_processors(); 465 #endif 466 467 /* Setup the runqueues and scheduler. */ 468 runq_init(); 469 sched_init(); 470 471 /* 472 * Create threads to call back and finish configuration for 473 * devices that want interrupts enabled. 474 */ 475 for (i = 0; i < interrupt_config_threads; i++) { 476 (void)kthread_create(PRI_NONE, 0, NULL, 477 config_interrupts_thread, NULL, NULL, "config"); 478 } 479 480 /* Get the threads going and into any sleeps before continuing. */ 481 yield(); 482 } 483 484 /* 485 * Announce device attach/detach to userland listeners. 486 */ 487 static void 488 devmon_report_device(device_t dev, bool isattach) 489 { 490 #if NDRVCTL > 0 491 prop_dictionary_t ev; 492 const char *parent; 493 const char *what; 494 device_t pdev = device_parent(dev); 495 496 ev = prop_dictionary_create(); 497 if (ev == NULL) 498 return; 499 500 what = (isattach ? "device-attach" : "device-detach"); 501 parent = (pdev == NULL ? "root" : device_xname(pdev)); 502 if (!prop_dictionary_set_cstring(ev, "device", device_xname(dev)) || 503 !prop_dictionary_set_cstring(ev, "parent", parent)) { 504 prop_object_release(ev); 505 return; 506 } 507 508 devmon_insert(what, ev); 509 #endif 510 } 511 512 /* 513 * Add a cfdriver to the system. 514 */ 515 int 516 config_cfdriver_attach(struct cfdriver *cd) 517 { 518 struct cfdriver *lcd; 519 520 /* Make sure this driver isn't already in the system. */ 521 LIST_FOREACH(lcd, &allcfdrivers, cd_list) { 522 if (STREQ(lcd->cd_name, cd->cd_name)) 523 return (EEXIST); 524 } 525 526 LIST_INIT(&cd->cd_attach); 527 LIST_INSERT_HEAD(&allcfdrivers, cd, cd_list); 528 529 return (0); 530 } 531 532 /* 533 * Remove a cfdriver from the system. 534 */ 535 int 536 config_cfdriver_detach(struct cfdriver *cd) 537 { 538 int i; 539 540 /* Make sure there are no active instances. */ 541 for (i = 0; i < cd->cd_ndevs; i++) { 542 if (cd->cd_devs[i] != NULL) 543 return (EBUSY); 544 } 545 546 /* ...and no attachments loaded. */ 547 if (LIST_EMPTY(&cd->cd_attach) == 0) 548 return (EBUSY); 549 550 LIST_REMOVE(cd, cd_list); 551 552 KASSERT(cd->cd_devs == NULL); 553 554 return (0); 555 } 556 557 /* 558 * Look up a cfdriver by name. 559 */ 560 struct cfdriver * 561 config_cfdriver_lookup(const char *name) 562 { 563 struct cfdriver *cd; 564 565 LIST_FOREACH(cd, &allcfdrivers, cd_list) { 566 if (STREQ(cd->cd_name, name)) 567 return (cd); 568 } 569 570 return (NULL); 571 } 572 573 /* 574 * Add a cfattach to the specified driver. 575 */ 576 int 577 config_cfattach_attach(const char *driver, struct cfattach *ca) 578 { 579 struct cfattach *lca; 580 struct cfdriver *cd; 581 582 cd = config_cfdriver_lookup(driver); 583 if (cd == NULL) 584 return (ESRCH); 585 586 /* Make sure this attachment isn't already on this driver. */ 587 LIST_FOREACH(lca, &cd->cd_attach, ca_list) { 588 if (STREQ(lca->ca_name, ca->ca_name)) 589 return (EEXIST); 590 } 591 592 LIST_INSERT_HEAD(&cd->cd_attach, ca, ca_list); 593 594 return (0); 595 } 596 597 /* 598 * Remove a cfattach from the specified driver. 599 */ 600 int 601 config_cfattach_detach(const char *driver, struct cfattach *ca) 602 { 603 struct cfdriver *cd; 604 device_t dev; 605 int i; 606 607 cd = config_cfdriver_lookup(driver); 608 if (cd == NULL) 609 return (ESRCH); 610 611 /* Make sure there are no active instances. */ 612 for (i = 0; i < cd->cd_ndevs; i++) { 613 if ((dev = cd->cd_devs[i]) == NULL) 614 continue; 615 if (dev->dv_cfattach == ca) 616 return (EBUSY); 617 } 618 619 LIST_REMOVE(ca, ca_list); 620 621 return (0); 622 } 623 624 /* 625 * Look up a cfattach by name. 626 */ 627 static struct cfattach * 628 config_cfattach_lookup_cd(struct cfdriver *cd, const char *atname) 629 { 630 struct cfattach *ca; 631 632 LIST_FOREACH(ca, &cd->cd_attach, ca_list) { 633 if (STREQ(ca->ca_name, atname)) 634 return (ca); 635 } 636 637 return (NULL); 638 } 639 640 /* 641 * Look up a cfattach by driver/attachment name. 642 */ 643 struct cfattach * 644 config_cfattach_lookup(const char *name, const char *atname) 645 { 646 struct cfdriver *cd; 647 648 cd = config_cfdriver_lookup(name); 649 if (cd == NULL) 650 return (NULL); 651 652 return (config_cfattach_lookup_cd(cd, atname)); 653 } 654 655 /* 656 * Apply the matching function and choose the best. This is used 657 * a few times and we want to keep the code small. 658 */ 659 static void 660 mapply(struct matchinfo *m, cfdata_t cf) 661 { 662 int pri; 663 664 if (m->fn != NULL) { 665 pri = (*m->fn)(m->parent, cf, m->locs, m->aux); 666 } else { 667 pri = config_match(m->parent, cf, m->aux); 668 } 669 if (pri > m->pri) { 670 m->match = cf; 671 m->pri = pri; 672 } 673 } 674 675 int 676 config_stdsubmatch(device_t parent, cfdata_t cf, const int *locs, void *aux) 677 { 678 const struct cfiattrdata *ci; 679 const struct cflocdesc *cl; 680 int nlocs, i; 681 682 ci = cfiattr_lookup(cf->cf_pspec->cfp_iattr, parent->dv_cfdriver); 683 KASSERT(ci); 684 nlocs = ci->ci_loclen; 685 KASSERT(!nlocs || locs); 686 for (i = 0; i < nlocs; i++) { 687 cl = &ci->ci_locdesc[i]; 688 /* !cld_defaultstr means no default value */ 689 if ((!(cl->cld_defaultstr) 690 || (cf->cf_loc[i] != cl->cld_default)) 691 && cf->cf_loc[i] != locs[i]) 692 return (0); 693 } 694 695 return (config_match(parent, cf, aux)); 696 } 697 698 /* 699 * Helper function: check whether the driver supports the interface attribute 700 * and return its descriptor structure. 701 */ 702 static const struct cfiattrdata * 703 cfdriver_get_iattr(const struct cfdriver *cd, const char *ia) 704 { 705 const struct cfiattrdata * const *cpp; 706 707 if (cd->cd_attrs == NULL) 708 return (0); 709 710 for (cpp = cd->cd_attrs; *cpp; cpp++) { 711 if (STREQ((*cpp)->ci_name, ia)) { 712 /* Match. */ 713 return (*cpp); 714 } 715 } 716 return (0); 717 } 718 719 /* 720 * Lookup an interface attribute description by name. 721 * If the driver is given, consider only its supported attributes. 722 */ 723 const struct cfiattrdata * 724 cfiattr_lookup(const char *name, const struct cfdriver *cd) 725 { 726 const struct cfdriver *d; 727 const struct cfiattrdata *ia; 728 729 if (cd) 730 return (cfdriver_get_iattr(cd, name)); 731 732 LIST_FOREACH(d, &allcfdrivers, cd_list) { 733 ia = cfdriver_get_iattr(d, name); 734 if (ia) 735 return (ia); 736 } 737 return (0); 738 } 739 740 /* 741 * Determine if `parent' is a potential parent for a device spec based 742 * on `cfp'. 743 */ 744 static int 745 cfparent_match(const device_t parent, const struct cfparent *cfp) 746 { 747 struct cfdriver *pcd; 748 749 /* We don't match root nodes here. */ 750 if (cfp == NULL) 751 return (0); 752 753 pcd = parent->dv_cfdriver; 754 KASSERT(pcd != NULL); 755 756 /* 757 * First, ensure this parent has the correct interface 758 * attribute. 759 */ 760 if (!cfdriver_get_iattr(pcd, cfp->cfp_iattr)) 761 return (0); 762 763 /* 764 * If no specific parent device instance was specified (i.e. 765 * we're attaching to the attribute only), we're done! 766 */ 767 if (cfp->cfp_parent == NULL) 768 return (1); 769 770 /* 771 * Check the parent device's name. 772 */ 773 if (STREQ(pcd->cd_name, cfp->cfp_parent) == 0) 774 return (0); /* not the same parent */ 775 776 /* 777 * Make sure the unit number matches. 778 */ 779 if (cfp->cfp_unit == DVUNIT_ANY || /* wildcard */ 780 cfp->cfp_unit == parent->dv_unit) 781 return (1); 782 783 /* Unit numbers don't match. */ 784 return (0); 785 } 786 787 /* 788 * Helper for config_cfdata_attach(): check all devices whether it could be 789 * parent any attachment in the config data table passed, and rescan. 790 */ 791 static void 792 rescan_with_cfdata(const struct cfdata *cf) 793 { 794 device_t d; 795 const struct cfdata *cf1; 796 deviter_t di; 797 798 799 /* 800 * "alldevs" is likely longer than a modules's cfdata, so make it 801 * the outer loop. 802 */ 803 for (d = deviter_first(&di, 0); d != NULL; d = deviter_next(&di)) { 804 805 if (!(d->dv_cfattach->ca_rescan)) 806 continue; 807 808 for (cf1 = cf; cf1->cf_name; cf1++) { 809 810 if (!cfparent_match(d, cf1->cf_pspec)) 811 continue; 812 813 (*d->dv_cfattach->ca_rescan)(d, 814 cf1->cf_pspec->cfp_iattr, cf1->cf_loc); 815 } 816 } 817 deviter_release(&di); 818 } 819 820 /* 821 * Attach a supplemental config data table and rescan potential 822 * parent devices if required. 823 */ 824 int 825 config_cfdata_attach(cfdata_t cf, int scannow) 826 { 827 struct cftable *ct; 828 829 ct = kmem_alloc(sizeof(*ct), KM_SLEEP); 830 ct->ct_cfdata = cf; 831 TAILQ_INSERT_TAIL(&allcftables, ct, ct_list); 832 833 if (scannow) 834 rescan_with_cfdata(cf); 835 836 return (0); 837 } 838 839 /* 840 * Helper for config_cfdata_detach: check whether a device is 841 * found through any attachment in the config data table. 842 */ 843 static int 844 dev_in_cfdata(const struct device *d, const struct cfdata *cf) 845 { 846 const struct cfdata *cf1; 847 848 for (cf1 = cf; cf1->cf_name; cf1++) 849 if (d->dv_cfdata == cf1) 850 return (1); 851 852 return (0); 853 } 854 855 /* 856 * Detach a supplemental config data table. Detach all devices found 857 * through that table (and thus keeping references to it) before. 858 */ 859 int 860 config_cfdata_detach(cfdata_t cf) 861 { 862 device_t d; 863 int error = 0; 864 struct cftable *ct; 865 deviter_t di; 866 867 for (d = deviter_first(&di, DEVITER_F_RW); d != NULL; 868 d = deviter_next(&di)) { 869 if (!dev_in_cfdata(d, cf)) 870 continue; 871 if ((error = config_detach(d, 0)) != 0) 872 break; 873 } 874 deviter_release(&di); 875 if (error) { 876 aprint_error_dev(d, "unable to detach instance\n"); 877 return error; 878 } 879 880 TAILQ_FOREACH(ct, &allcftables, ct_list) { 881 if (ct->ct_cfdata == cf) { 882 TAILQ_REMOVE(&allcftables, ct, ct_list); 883 kmem_free(ct, sizeof(*ct)); 884 return (0); 885 } 886 } 887 888 /* not found -- shouldn't happen */ 889 return (EINVAL); 890 } 891 892 /* 893 * Invoke the "match" routine for a cfdata entry on behalf of 894 * an external caller, usually a "submatch" routine. 895 */ 896 int 897 config_match(device_t parent, cfdata_t cf, void *aux) 898 { 899 struct cfattach *ca; 900 901 ca = config_cfattach_lookup(cf->cf_name, cf->cf_atname); 902 if (ca == NULL) { 903 /* No attachment for this entry, oh well. */ 904 return (0); 905 } 906 907 return ((*ca->ca_match)(parent, cf, aux)); 908 } 909 910 /* 911 * Iterate over all potential children of some device, calling the given 912 * function (default being the child's match function) for each one. 913 * Nonzero returns are matches; the highest value returned is considered 914 * the best match. Return the `found child' if we got a match, or NULL 915 * otherwise. The `aux' pointer is simply passed on through. 916 * 917 * Note that this function is designed so that it can be used to apply 918 * an arbitrary function to all potential children (its return value 919 * can be ignored). 920 */ 921 cfdata_t 922 config_search_loc(cfsubmatch_t fn, device_t parent, 923 const char *ifattr, const int *locs, void *aux) 924 { 925 struct cftable *ct; 926 cfdata_t cf; 927 struct matchinfo m; 928 929 KASSERT(config_initialized); 930 KASSERT(!ifattr || cfdriver_get_iattr(parent->dv_cfdriver, ifattr)); 931 932 m.fn = fn; 933 m.parent = parent; 934 m.locs = locs; 935 m.aux = aux; 936 m.match = NULL; 937 m.pri = 0; 938 939 TAILQ_FOREACH(ct, &allcftables, ct_list) { 940 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 941 942 /* We don't match root nodes here. */ 943 if (!cf->cf_pspec) 944 continue; 945 946 /* 947 * Skip cf if no longer eligible, otherwise scan 948 * through parents for one matching `parent', and 949 * try match function. 950 */ 951 if (cf->cf_fstate == FSTATE_FOUND) 952 continue; 953 if (cf->cf_fstate == FSTATE_DNOTFOUND || 954 cf->cf_fstate == FSTATE_DSTAR) 955 continue; 956 957 /* 958 * If an interface attribute was specified, 959 * consider only children which attach to 960 * that attribute. 961 */ 962 if (ifattr && !STREQ(ifattr, cf->cf_pspec->cfp_iattr)) 963 continue; 964 965 if (cfparent_match(parent, cf->cf_pspec)) 966 mapply(&m, cf); 967 } 968 } 969 return (m.match); 970 } 971 972 cfdata_t 973 config_search_ia(cfsubmatch_t fn, device_t parent, const char *ifattr, 974 void *aux) 975 { 976 977 return (config_search_loc(fn, parent, ifattr, NULL, aux)); 978 } 979 980 /* 981 * Find the given root device. 982 * This is much like config_search, but there is no parent. 983 * Don't bother with multiple cfdata tables; the root node 984 * must always be in the initial table. 985 */ 986 cfdata_t 987 config_rootsearch(cfsubmatch_t fn, const char *rootname, void *aux) 988 { 989 cfdata_t cf; 990 const short *p; 991 struct matchinfo m; 992 993 m.fn = fn; 994 m.parent = ROOT; 995 m.aux = aux; 996 m.match = NULL; 997 m.pri = 0; 998 m.locs = 0; 999 /* 1000 * Look at root entries for matching name. We do not bother 1001 * with found-state here since only one root should ever be 1002 * searched (and it must be done first). 1003 */ 1004 for (p = cfroots; *p >= 0; p++) { 1005 cf = &cfdata[*p]; 1006 if (strcmp(cf->cf_name, rootname) == 0) 1007 mapply(&m, cf); 1008 } 1009 return (m.match); 1010 } 1011 1012 static const char * const msgs[3] = { "", " not configured\n", " unsupported\n" }; 1013 1014 /* 1015 * The given `aux' argument describes a device that has been found 1016 * on the given parent, but not necessarily configured. Locate the 1017 * configuration data for that device (using the submatch function 1018 * provided, or using candidates' cd_match configuration driver 1019 * functions) and attach it, and return true. If the device was 1020 * not configured, call the given `print' function and return 0. 1021 */ 1022 device_t 1023 config_found_sm_loc(device_t parent, 1024 const char *ifattr, const int *locs, void *aux, 1025 cfprint_t print, cfsubmatch_t submatch) 1026 { 1027 cfdata_t cf; 1028 1029 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1030 if (splash_progress_state) 1031 splash_progress_update(splash_progress_state); 1032 #endif 1033 1034 if ((cf = config_search_loc(submatch, parent, ifattr, locs, aux))) 1035 return(config_attach_loc(parent, cf, locs, aux, print)); 1036 if (print) { 1037 if (config_do_twiddle) 1038 twiddle(); 1039 aprint_normal("%s", msgs[(*print)(aux, device_xname(parent))]); 1040 } 1041 1042 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1043 if (splash_progress_state) 1044 splash_progress_update(splash_progress_state); 1045 #endif 1046 1047 return (NULL); 1048 } 1049 1050 device_t 1051 config_found_ia(device_t parent, const char *ifattr, void *aux, 1052 cfprint_t print) 1053 { 1054 1055 return (config_found_sm_loc(parent, ifattr, NULL, aux, print, NULL)); 1056 } 1057 1058 device_t 1059 config_found(device_t parent, void *aux, cfprint_t print) 1060 { 1061 1062 return (config_found_sm_loc(parent, NULL, NULL, aux, print, NULL)); 1063 } 1064 1065 /* 1066 * As above, but for root devices. 1067 */ 1068 device_t 1069 config_rootfound(const char *rootname, void *aux) 1070 { 1071 cfdata_t cf; 1072 1073 if ((cf = config_rootsearch((cfsubmatch_t)NULL, rootname, aux)) != NULL) 1074 return (config_attach(ROOT, cf, aux, (cfprint_t)NULL)); 1075 aprint_error("root device %s not configured\n", rootname); 1076 return (NULL); 1077 } 1078 1079 /* just like sprintf(buf, "%d") except that it works from the end */ 1080 static char * 1081 number(char *ep, int n) 1082 { 1083 1084 *--ep = 0; 1085 while (n >= 10) { 1086 *--ep = (n % 10) + '0'; 1087 n /= 10; 1088 } 1089 *--ep = n + '0'; 1090 return (ep); 1091 } 1092 1093 /* 1094 * Expand the size of the cd_devs array if necessary. 1095 */ 1096 static void 1097 config_makeroom(int n, struct cfdriver *cd) 1098 { 1099 int old, new; 1100 device_t *nsp; 1101 1102 if (n < cd->cd_ndevs) 1103 return; 1104 1105 /* 1106 * Need to expand the array. 1107 */ 1108 old = cd->cd_ndevs; 1109 if (old == 0) 1110 new = 4; 1111 else 1112 new = old * 2; 1113 while (new <= n) 1114 new *= 2; 1115 cd->cd_ndevs = new; 1116 nsp = kmem_alloc(sizeof(device_t [new]), KM_SLEEP); 1117 if (nsp == NULL) 1118 panic("config_attach: %sing dev array", 1119 old != 0 ? "expand" : "creat"); 1120 memset(nsp + old, 0, sizeof(device_t [new - old])); 1121 if (old != 0) { 1122 memcpy(nsp, cd->cd_devs, sizeof(device_t [old])); 1123 kmem_free(cd->cd_devs, sizeof(device_t [old])); 1124 } 1125 cd->cd_devs = nsp; 1126 } 1127 1128 static void 1129 config_devlink(device_t dev) 1130 { 1131 struct cfdriver *cd = dev->dv_cfdriver; 1132 1133 /* put this device in the devices array */ 1134 config_makeroom(dev->dv_unit, cd); 1135 if (cd->cd_devs[dev->dv_unit]) 1136 panic("config_attach: duplicate %s", device_xname(dev)); 1137 cd->cd_devs[dev->dv_unit] = dev; 1138 1139 /* It is safe to add a device to the tail of the list while 1140 * readers are in the list, but not while a writer is in 1141 * the list. Wait for any writer to complete. 1142 */ 1143 mutex_enter(&alldevs_mtx); 1144 while (alldevs_nwrite != 0 && alldevs_writer != curlwp) 1145 cv_wait(&alldevs_cv, &alldevs_mtx); 1146 TAILQ_INSERT_TAIL(&alldevs, dev, dv_list); /* link up */ 1147 cv_signal(&alldevs_cv); 1148 mutex_exit(&alldevs_mtx); 1149 } 1150 1151 static void 1152 config_devunlink(device_t dev) 1153 { 1154 struct cfdriver *cd = dev->dv_cfdriver; 1155 int i; 1156 1157 /* Unlink from device list. */ 1158 TAILQ_REMOVE(&alldevs, dev, dv_list); 1159 1160 /* Remove from cfdriver's array. */ 1161 cd->cd_devs[dev->dv_unit] = NULL; 1162 1163 /* 1164 * If the device now has no units in use, deallocate its softc array. 1165 */ 1166 for (i = 0; i < cd->cd_ndevs; i++) { 1167 if (cd->cd_devs[i] != NULL) 1168 return; 1169 } 1170 /* nothing found; deallocate */ 1171 kmem_free(cd->cd_devs, sizeof(device_t [cd->cd_ndevs])); 1172 cd->cd_devs = NULL; 1173 cd->cd_ndevs = 0; 1174 } 1175 1176 static device_t 1177 config_devalloc(const device_t parent, const cfdata_t cf, const int *locs) 1178 { 1179 struct cfdriver *cd; 1180 struct cfattach *ca; 1181 size_t lname, lunit; 1182 const char *xunit; 1183 int myunit; 1184 char num[10]; 1185 device_t dev; 1186 void *dev_private; 1187 const struct cfiattrdata *ia; 1188 1189 cd = config_cfdriver_lookup(cf->cf_name); 1190 if (cd == NULL) 1191 return (NULL); 1192 1193 ca = config_cfattach_lookup_cd(cd, cf->cf_atname); 1194 if (ca == NULL) 1195 return (NULL); 1196 1197 if ((ca->ca_flags & DVF_PRIV_ALLOC) == 0 && 1198 ca->ca_devsize < sizeof(struct device)) 1199 panic("config_devalloc: %s", cf->cf_atname); 1200 1201 #ifndef __BROKEN_CONFIG_UNIT_USAGE 1202 if (cf->cf_fstate == FSTATE_STAR) { 1203 for (myunit = cf->cf_unit; myunit < cd->cd_ndevs; myunit++) 1204 if (cd->cd_devs[myunit] == NULL) 1205 break; 1206 /* 1207 * myunit is now the unit of the first NULL device pointer, 1208 * or max(cd->cd_ndevs,cf->cf_unit). 1209 */ 1210 } else { 1211 myunit = cf->cf_unit; 1212 if (myunit < cd->cd_ndevs && cd->cd_devs[myunit] != NULL) 1213 return (NULL); 1214 } 1215 #else 1216 myunit = cf->cf_unit; 1217 #endif /* ! __BROKEN_CONFIG_UNIT_USAGE */ 1218 1219 /* compute length of name and decimal expansion of unit number */ 1220 lname = strlen(cd->cd_name); 1221 xunit = number(&num[sizeof(num)], myunit); 1222 lunit = &num[sizeof(num)] - xunit; 1223 if (lname + lunit > sizeof(dev->dv_xname)) 1224 panic("config_devalloc: device name too long"); 1225 1226 /* get memory for all device vars */ 1227 KASSERT((ca->ca_flags & DVF_PRIV_ALLOC) || ca->ca_devsize >= sizeof(struct device)); 1228 if (ca->ca_devsize > 0) { 1229 dev_private = kmem_zalloc(ca->ca_devsize, KM_SLEEP); 1230 if (dev_private == NULL) 1231 panic("config_devalloc: memory allocation for device softc failed"); 1232 } else { 1233 KASSERT(ca->ca_flags & DVF_PRIV_ALLOC); 1234 dev_private = NULL; 1235 } 1236 1237 if ((ca->ca_flags & DVF_PRIV_ALLOC) != 0) { 1238 dev = kmem_zalloc(sizeof(*dev), KM_SLEEP); 1239 } else { 1240 dev = dev_private; 1241 } 1242 if (dev == NULL) 1243 panic("config_devalloc: memory allocation for device_t failed"); 1244 1245 dev->dv_class = cd->cd_class; 1246 dev->dv_cfdata = cf; 1247 dev->dv_cfdriver = cd; 1248 dev->dv_cfattach = ca; 1249 dev->dv_unit = myunit; 1250 dev->dv_activity_count = 0; 1251 dev->dv_activity_handlers = NULL; 1252 dev->dv_private = dev_private; 1253 memcpy(dev->dv_xname, cd->cd_name, lname); 1254 memcpy(dev->dv_xname + lname, xunit, lunit); 1255 dev->dv_parent = parent; 1256 if (parent != NULL) 1257 dev->dv_depth = parent->dv_depth + 1; 1258 else 1259 dev->dv_depth = 0; 1260 dev->dv_flags = DVF_ACTIVE; /* always initially active */ 1261 dev->dv_flags |= ca->ca_flags; /* inherit flags from class */ 1262 if (locs) { 1263 KASSERT(parent); /* no locators at root */ 1264 ia = cfiattr_lookup(cf->cf_pspec->cfp_iattr, 1265 parent->dv_cfdriver); 1266 dev->dv_locators = 1267 kmem_alloc(sizeof(int [ia->ci_loclen + 1]), KM_SLEEP); 1268 *dev->dv_locators++ = sizeof(int [ia->ci_loclen + 1]); 1269 memcpy(dev->dv_locators, locs, sizeof(int [ia->ci_loclen])); 1270 } 1271 dev->dv_properties = prop_dictionary_create(); 1272 KASSERT(dev->dv_properties != NULL); 1273 1274 prop_dictionary_set_cstring_nocopy(dev->dv_properties, 1275 "device-driver", dev->dv_cfdriver->cd_name); 1276 prop_dictionary_set_uint16(dev->dv_properties, 1277 "device-unit", dev->dv_unit); 1278 1279 return (dev); 1280 } 1281 1282 static void 1283 config_devdealloc(device_t dev) 1284 { 1285 int priv = (dev->dv_flags & DVF_PRIV_ALLOC); 1286 1287 KASSERT(dev->dv_properties != NULL); 1288 prop_object_release(dev->dv_properties); 1289 1290 if (dev->dv_activity_handlers) 1291 panic("config_devdealloc with registered handlers"); 1292 1293 if (dev->dv_locators) { 1294 size_t amount = *--dev->dv_locators; 1295 kmem_free(dev->dv_locators, amount); 1296 } 1297 1298 if (dev->dv_cfattach->ca_devsize > 0) 1299 kmem_free(dev->dv_private, dev->dv_cfattach->ca_devsize); 1300 if (priv) 1301 kmem_free(dev, sizeof(*dev)); 1302 } 1303 1304 /* 1305 * Attach a found device. 1306 */ 1307 device_t 1308 config_attach_loc(device_t parent, cfdata_t cf, 1309 const int *locs, void *aux, cfprint_t print) 1310 { 1311 device_t dev; 1312 struct cftable *ct; 1313 const char *drvname; 1314 1315 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1316 if (splash_progress_state) 1317 splash_progress_update(splash_progress_state); 1318 #endif 1319 1320 dev = config_devalloc(parent, cf, locs); 1321 if (!dev) 1322 panic("config_attach: allocation of device softc failed"); 1323 1324 /* XXX redundant - see below? */ 1325 if (cf->cf_fstate != FSTATE_STAR) { 1326 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1327 cf->cf_fstate = FSTATE_FOUND; 1328 } 1329 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1330 else 1331 cf->cf_unit++; 1332 #endif 1333 1334 config_devlink(dev); 1335 1336 if (config_do_twiddle) 1337 twiddle(); 1338 else 1339 aprint_naive("Found "); 1340 /* 1341 * We want the next two printfs for normal, verbose, and quiet, 1342 * but not silent (in which case, we're twiddling, instead). 1343 */ 1344 if (parent == ROOT) { 1345 aprint_naive("%s (root)", device_xname(dev)); 1346 aprint_normal("%s (root)", device_xname(dev)); 1347 } else { 1348 aprint_naive("%s at %s", device_xname(dev), device_xname(parent)); 1349 aprint_normal("%s at %s", device_xname(dev), device_xname(parent)); 1350 if (print) 1351 (void) (*print)(aux, NULL); 1352 } 1353 1354 /* 1355 * Before attaching, clobber any unfound devices that are 1356 * otherwise identical. 1357 * XXX code above is redundant? 1358 */ 1359 drvname = dev->dv_cfdriver->cd_name; 1360 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1361 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1362 if (STREQ(cf->cf_name, drvname) && 1363 cf->cf_unit == dev->dv_unit) { 1364 if (cf->cf_fstate == FSTATE_NOTFOUND) 1365 cf->cf_fstate = FSTATE_FOUND; 1366 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1367 /* 1368 * Bump the unit number on all starred cfdata 1369 * entries for this device. 1370 */ 1371 if (cf->cf_fstate == FSTATE_STAR) 1372 cf->cf_unit++; 1373 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 1374 } 1375 } 1376 } 1377 #ifdef __HAVE_DEVICE_REGISTER 1378 device_register(dev, aux); 1379 #endif 1380 1381 /* Let userland know */ 1382 devmon_report_device(dev, true); 1383 1384 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1385 if (splash_progress_state) 1386 splash_progress_update(splash_progress_state); 1387 #endif 1388 (*dev->dv_cfattach->ca_attach)(parent, dev, aux); 1389 #if defined(SPLASHSCREEN) && defined(SPLASHSCREEN_PROGRESS) 1390 if (splash_progress_state) 1391 splash_progress_update(splash_progress_state); 1392 #endif 1393 1394 if (!device_pmf_is_registered(dev)) 1395 aprint_debug_dev(dev, "WARNING: power management not supported\n"); 1396 1397 config_process_deferred(&deferred_config_queue, dev); 1398 return (dev); 1399 } 1400 1401 device_t 1402 config_attach(device_t parent, cfdata_t cf, void *aux, cfprint_t print) 1403 { 1404 1405 return (config_attach_loc(parent, cf, NULL, aux, print)); 1406 } 1407 1408 /* 1409 * As above, but for pseudo-devices. Pseudo-devices attached in this 1410 * way are silently inserted into the device tree, and their children 1411 * attached. 1412 * 1413 * Note that because pseudo-devices are attached silently, any information 1414 * the attach routine wishes to print should be prefixed with the device 1415 * name by the attach routine. 1416 */ 1417 device_t 1418 config_attach_pseudo(cfdata_t cf) 1419 { 1420 device_t dev; 1421 1422 dev = config_devalloc(ROOT, cf, NULL); 1423 if (!dev) 1424 return (NULL); 1425 1426 /* XXX mark busy in cfdata */ 1427 1428 if (cf->cf_fstate != FSTATE_STAR) { 1429 KASSERT(cf->cf_fstate == FSTATE_NOTFOUND); 1430 cf->cf_fstate = FSTATE_FOUND; 1431 } 1432 1433 config_devlink(dev); 1434 1435 #if 0 /* XXXJRT not yet */ 1436 #ifdef __HAVE_DEVICE_REGISTER 1437 device_register(dev, NULL); /* like a root node */ 1438 #endif 1439 #endif 1440 (*dev->dv_cfattach->ca_attach)(ROOT, dev, NULL); 1441 config_process_deferred(&deferred_config_queue, dev); 1442 return (dev); 1443 } 1444 1445 /* 1446 * Detach a device. Optionally forced (e.g. because of hardware 1447 * removal) and quiet. Returns zero if successful, non-zero 1448 * (an error code) otherwise. 1449 * 1450 * Note that this code wants to be run from a process context, so 1451 * that the detach can sleep to allow processes which have a device 1452 * open to run and unwind their stacks. 1453 */ 1454 int 1455 config_detach(device_t dev, int flags) 1456 { 1457 struct cftable *ct; 1458 cfdata_t cf; 1459 const struct cfattach *ca; 1460 struct cfdriver *cd; 1461 #ifdef DIAGNOSTIC 1462 device_t d; 1463 #endif 1464 int rv = 0; 1465 1466 #ifdef DIAGNOSTIC 1467 cf = dev->dv_cfdata; 1468 if (cf != NULL && cf->cf_fstate != FSTATE_FOUND && 1469 cf->cf_fstate != FSTATE_STAR) 1470 panic("config_detach: %s: bad device fstate %d", 1471 device_xname(dev), cf ? cf->cf_fstate : -1); 1472 #endif 1473 cd = dev->dv_cfdriver; 1474 KASSERT(cd != NULL); 1475 1476 ca = dev->dv_cfattach; 1477 KASSERT(ca != NULL); 1478 1479 KASSERT(curlwp != NULL); 1480 mutex_enter(&alldevs_mtx); 1481 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 1482 ; 1483 else while (alldevs_nread != 0 || 1484 (alldevs_nwrite != 0 && alldevs_writer != curlwp)) 1485 cv_wait(&alldevs_cv, &alldevs_mtx); 1486 if (alldevs_nwrite++ == 0) 1487 alldevs_writer = curlwp; 1488 mutex_exit(&alldevs_mtx); 1489 1490 /* 1491 * Ensure the device is deactivated. If the device doesn't 1492 * have an activation entry point, we allow DVF_ACTIVE to 1493 * remain set. Otherwise, if DVF_ACTIVE is still set, the 1494 * device is busy, and the detach fails. 1495 */ 1496 if (ca->ca_activate != NULL) 1497 rv = config_deactivate(dev); 1498 1499 /* 1500 * Try to detach the device. If that's not possible, then 1501 * we either panic() (for the forced but failed case), or 1502 * return an error. 1503 */ 1504 if (rv == 0) { 1505 if (ca->ca_detach != NULL) 1506 rv = (*ca->ca_detach)(dev, flags); 1507 else 1508 rv = EOPNOTSUPP; 1509 } 1510 if (rv != 0) { 1511 if ((flags & DETACH_FORCE) == 0) 1512 goto out; 1513 else 1514 panic("config_detach: forced detach of %s failed (%d)", 1515 device_xname(dev), rv); 1516 } 1517 1518 /* 1519 * The device has now been successfully detached. 1520 */ 1521 1522 /* Let userland know */ 1523 devmon_report_device(dev, false); 1524 1525 #ifdef DIAGNOSTIC 1526 /* 1527 * Sanity: If you're successfully detached, you should have no 1528 * children. (Note that because children must be attached 1529 * after parents, we only need to search the latter part of 1530 * the list.) 1531 */ 1532 for (d = TAILQ_NEXT(dev, dv_list); d != NULL; 1533 d = TAILQ_NEXT(d, dv_list)) { 1534 if (d->dv_parent == dev) { 1535 printf("config_detach: detached device %s" 1536 " has children %s\n", device_xname(dev), device_xname(d)); 1537 panic("config_detach"); 1538 } 1539 } 1540 #endif 1541 1542 /* notify the parent that the child is gone */ 1543 if (dev->dv_parent) { 1544 device_t p = dev->dv_parent; 1545 if (p->dv_cfattach->ca_childdetached) 1546 (*p->dv_cfattach->ca_childdetached)(p, dev); 1547 } 1548 1549 /* 1550 * Mark cfdata to show that the unit can be reused, if possible. 1551 */ 1552 TAILQ_FOREACH(ct, &allcftables, ct_list) { 1553 for (cf = ct->ct_cfdata; cf->cf_name; cf++) { 1554 if (STREQ(cf->cf_name, cd->cd_name)) { 1555 if (cf->cf_fstate == FSTATE_FOUND && 1556 cf->cf_unit == dev->dv_unit) 1557 cf->cf_fstate = FSTATE_NOTFOUND; 1558 #ifdef __BROKEN_CONFIG_UNIT_USAGE 1559 /* 1560 * Note that we can only re-use a starred 1561 * unit number if the unit being detached 1562 * had the last assigned unit number. 1563 */ 1564 if (cf->cf_fstate == FSTATE_STAR && 1565 cf->cf_unit == dev->dv_unit + 1) 1566 cf->cf_unit--; 1567 #endif /* __BROKEN_CONFIG_UNIT_USAGE */ 1568 } 1569 } 1570 } 1571 1572 config_devunlink(dev); 1573 1574 if (dev->dv_cfdata != NULL && (flags & DETACH_QUIET) == 0) 1575 aprint_normal_dev(dev, "detached\n"); 1576 1577 config_devdealloc(dev); 1578 1579 out: 1580 mutex_enter(&alldevs_mtx); 1581 if (--alldevs_nwrite == 0) 1582 alldevs_writer = NULL; 1583 cv_signal(&alldevs_cv); 1584 mutex_exit(&alldevs_mtx); 1585 return rv; 1586 } 1587 1588 int 1589 config_detach_children(device_t parent, int flags) 1590 { 1591 device_t dv; 1592 deviter_t di; 1593 int error = 0; 1594 1595 for (dv = deviter_first(&di, DEVITER_F_RW); dv != NULL; 1596 dv = deviter_next(&di)) { 1597 if (device_parent(dv) != parent) 1598 continue; 1599 if ((error = config_detach(dv, flags)) != 0) 1600 break; 1601 } 1602 deviter_release(&di); 1603 return error; 1604 } 1605 1606 int 1607 config_activate(device_t dev) 1608 { 1609 const struct cfattach *ca = dev->dv_cfattach; 1610 int rv = 0, oflags = dev->dv_flags; 1611 1612 if (ca->ca_activate == NULL) 1613 return (EOPNOTSUPP); 1614 1615 if ((dev->dv_flags & DVF_ACTIVE) == 0) { 1616 dev->dv_flags |= DVF_ACTIVE; 1617 rv = (*ca->ca_activate)(dev, DVACT_ACTIVATE); 1618 if (rv) 1619 dev->dv_flags = oflags; 1620 } 1621 return (rv); 1622 } 1623 1624 int 1625 config_deactivate(device_t dev) 1626 { 1627 const struct cfattach *ca = dev->dv_cfattach; 1628 int rv = 0, oflags = dev->dv_flags; 1629 1630 if (ca->ca_activate == NULL) 1631 return (EOPNOTSUPP); 1632 1633 if (dev->dv_flags & DVF_ACTIVE) { 1634 dev->dv_flags &= ~DVF_ACTIVE; 1635 rv = (*ca->ca_activate)(dev, DVACT_DEACTIVATE); 1636 if (rv) 1637 dev->dv_flags = oflags; 1638 } 1639 return (rv); 1640 } 1641 1642 /* 1643 * Defer the configuration of the specified device until all 1644 * of its parent's devices have been attached. 1645 */ 1646 void 1647 config_defer(device_t dev, void (*func)(device_t)) 1648 { 1649 struct deferred_config *dc; 1650 1651 if (dev->dv_parent == NULL) 1652 panic("config_defer: can't defer config of a root device"); 1653 1654 #ifdef DIAGNOSTIC 1655 for (dc = TAILQ_FIRST(&deferred_config_queue); dc != NULL; 1656 dc = TAILQ_NEXT(dc, dc_queue)) { 1657 if (dc->dc_dev == dev) 1658 panic("config_defer: deferred twice"); 1659 } 1660 #endif 1661 1662 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1663 if (dc == NULL) 1664 panic("config_defer: unable to allocate callback"); 1665 1666 dc->dc_dev = dev; 1667 dc->dc_func = func; 1668 TAILQ_INSERT_TAIL(&deferred_config_queue, dc, dc_queue); 1669 config_pending_incr(); 1670 } 1671 1672 /* 1673 * Defer some autoconfiguration for a device until after interrupts 1674 * are enabled. 1675 */ 1676 void 1677 config_interrupts(device_t dev, void (*func)(device_t)) 1678 { 1679 struct deferred_config *dc; 1680 1681 /* 1682 * If interrupts are enabled, callback now. 1683 */ 1684 if (cold == 0) { 1685 (*func)(dev); 1686 return; 1687 } 1688 1689 #ifdef DIAGNOSTIC 1690 for (dc = TAILQ_FIRST(&interrupt_config_queue); dc != NULL; 1691 dc = TAILQ_NEXT(dc, dc_queue)) { 1692 if (dc->dc_dev == dev) 1693 panic("config_interrupts: deferred twice"); 1694 } 1695 #endif 1696 1697 dc = kmem_alloc(sizeof(*dc), KM_SLEEP); 1698 if (dc == NULL) 1699 panic("config_interrupts: unable to allocate callback"); 1700 1701 dc->dc_dev = dev; 1702 dc->dc_func = func; 1703 TAILQ_INSERT_TAIL(&interrupt_config_queue, dc, dc_queue); 1704 config_pending_incr(); 1705 } 1706 1707 /* 1708 * Process a deferred configuration queue. 1709 */ 1710 static void 1711 config_process_deferred(struct deferred_config_head *queue, 1712 device_t parent) 1713 { 1714 struct deferred_config *dc, *ndc; 1715 1716 for (dc = TAILQ_FIRST(queue); dc != NULL; dc = ndc) { 1717 ndc = TAILQ_NEXT(dc, dc_queue); 1718 if (parent == NULL || dc->dc_dev->dv_parent == parent) { 1719 TAILQ_REMOVE(queue, dc, dc_queue); 1720 (*dc->dc_func)(dc->dc_dev); 1721 kmem_free(dc, sizeof(*dc)); 1722 config_pending_decr(); 1723 } 1724 } 1725 } 1726 1727 /* 1728 * Manipulate the config_pending semaphore. 1729 */ 1730 void 1731 config_pending_incr(void) 1732 { 1733 1734 mutex_enter(&config_misc_lock); 1735 config_pending++; 1736 mutex_exit(&config_misc_lock); 1737 } 1738 1739 void 1740 config_pending_decr(void) 1741 { 1742 1743 #ifdef DIAGNOSTIC 1744 if (config_pending == 0) 1745 panic("config_pending_decr: config_pending == 0"); 1746 #endif 1747 mutex_enter(&config_misc_lock); 1748 config_pending--; 1749 if (config_pending == 0) 1750 cv_broadcast(&config_misc_cv); 1751 mutex_exit(&config_misc_lock); 1752 } 1753 1754 /* 1755 * Register a "finalization" routine. Finalization routines are 1756 * called iteratively once all real devices have been found during 1757 * autoconfiguration, for as long as any one finalizer has done 1758 * any work. 1759 */ 1760 int 1761 config_finalize_register(device_t dev, int (*fn)(device_t)) 1762 { 1763 struct finalize_hook *f; 1764 1765 /* 1766 * If finalization has already been done, invoke the 1767 * callback function now. 1768 */ 1769 if (config_finalize_done) { 1770 while ((*fn)(dev) != 0) 1771 /* loop */ ; 1772 } 1773 1774 /* Ensure this isn't already on the list. */ 1775 TAILQ_FOREACH(f, &config_finalize_list, f_list) { 1776 if (f->f_func == fn && f->f_dev == dev) 1777 return (EEXIST); 1778 } 1779 1780 f = kmem_alloc(sizeof(*f), KM_SLEEP); 1781 f->f_func = fn; 1782 f->f_dev = dev; 1783 TAILQ_INSERT_TAIL(&config_finalize_list, f, f_list); 1784 1785 return (0); 1786 } 1787 1788 void 1789 config_finalize(void) 1790 { 1791 struct finalize_hook *f; 1792 struct pdevinit *pdev; 1793 extern struct pdevinit pdevinit[]; 1794 int errcnt, rv; 1795 1796 /* 1797 * Now that device driver threads have been created, wait for 1798 * them to finish any deferred autoconfiguration. 1799 */ 1800 mutex_enter(&config_misc_lock); 1801 while (config_pending != 0) 1802 cv_wait(&config_misc_cv, &config_misc_lock); 1803 mutex_exit(&config_misc_lock); 1804 1805 KERNEL_LOCK(1, NULL); 1806 1807 /* Attach pseudo-devices. */ 1808 for (pdev = pdevinit; pdev->pdev_attach != NULL; pdev++) 1809 (*pdev->pdev_attach)(pdev->pdev_count); 1810 1811 /* Run the hooks until none of them does any work. */ 1812 do { 1813 rv = 0; 1814 TAILQ_FOREACH(f, &config_finalize_list, f_list) 1815 rv |= (*f->f_func)(f->f_dev); 1816 } while (rv != 0); 1817 1818 config_finalize_done = 1; 1819 1820 /* Now free all the hooks. */ 1821 while ((f = TAILQ_FIRST(&config_finalize_list)) != NULL) { 1822 TAILQ_REMOVE(&config_finalize_list, f, f_list); 1823 kmem_free(f, sizeof(*f)); 1824 } 1825 1826 KERNEL_UNLOCK_ONE(NULL); 1827 1828 errcnt = aprint_get_error_count(); 1829 if ((boothowto & (AB_QUIET|AB_SILENT)) != 0 && 1830 (boothowto & AB_VERBOSE) == 0) { 1831 if (config_do_twiddle) { 1832 config_do_twiddle = 0; 1833 printf_nolog(" done.\n"); 1834 } 1835 if (errcnt != 0) { 1836 printf("WARNING: %d error%s while detecting hardware; " 1837 "check system log.\n", errcnt, 1838 errcnt == 1 ? "" : "s"); 1839 } 1840 } 1841 } 1842 1843 /* 1844 * device_lookup: 1845 * 1846 * Look up a device instance for a given driver. 1847 */ 1848 device_t 1849 device_lookup(cfdriver_t cd, int unit) 1850 { 1851 1852 if (unit < 0 || unit >= cd->cd_ndevs) 1853 return (NULL); 1854 1855 return (cd->cd_devs[unit]); 1856 } 1857 1858 /* 1859 * device_lookup: 1860 * 1861 * Look up a device instance for a given driver. 1862 */ 1863 void * 1864 device_lookup_private(cfdriver_t cd, int unit) 1865 { 1866 device_t dv; 1867 1868 if (unit < 0 || unit >= cd->cd_ndevs) 1869 return NULL; 1870 1871 if ((dv = cd->cd_devs[unit]) == NULL) 1872 return NULL; 1873 1874 return dv->dv_private; 1875 } 1876 1877 /* 1878 * Accessor functions for the device_t type. 1879 */ 1880 devclass_t 1881 device_class(device_t dev) 1882 { 1883 1884 return (dev->dv_class); 1885 } 1886 1887 cfdata_t 1888 device_cfdata(device_t dev) 1889 { 1890 1891 return (dev->dv_cfdata); 1892 } 1893 1894 cfdriver_t 1895 device_cfdriver(device_t dev) 1896 { 1897 1898 return (dev->dv_cfdriver); 1899 } 1900 1901 cfattach_t 1902 device_cfattach(device_t dev) 1903 { 1904 1905 return (dev->dv_cfattach); 1906 } 1907 1908 int 1909 device_unit(device_t dev) 1910 { 1911 1912 return (dev->dv_unit); 1913 } 1914 1915 const char * 1916 device_xname(device_t dev) 1917 { 1918 1919 return (dev->dv_xname); 1920 } 1921 1922 device_t 1923 device_parent(device_t dev) 1924 { 1925 1926 return (dev->dv_parent); 1927 } 1928 1929 bool 1930 device_is_active(device_t dev) 1931 { 1932 int active_flags; 1933 1934 active_flags = DVF_ACTIVE; 1935 active_flags |= DVF_CLASS_SUSPENDED; 1936 active_flags |= DVF_DRIVER_SUSPENDED; 1937 active_flags |= DVF_BUS_SUSPENDED; 1938 1939 return ((dev->dv_flags & active_flags) == DVF_ACTIVE); 1940 } 1941 1942 bool 1943 device_is_enabled(device_t dev) 1944 { 1945 return (dev->dv_flags & DVF_ACTIVE) == DVF_ACTIVE; 1946 } 1947 1948 bool 1949 device_has_power(device_t dev) 1950 { 1951 int active_flags; 1952 1953 active_flags = DVF_ACTIVE | DVF_BUS_SUSPENDED; 1954 1955 return ((dev->dv_flags & active_flags) == DVF_ACTIVE); 1956 } 1957 1958 int 1959 device_locator(device_t dev, u_int locnum) 1960 { 1961 1962 KASSERT(dev->dv_locators != NULL); 1963 return (dev->dv_locators[locnum]); 1964 } 1965 1966 void * 1967 device_private(device_t dev) 1968 { 1969 1970 /* 1971 * The reason why device_private(NULL) is allowed is to simplify the 1972 * work of a lot of userspace request handlers (i.e., c/bdev 1973 * handlers) which grab cfdriver_t->cd_units[n]. 1974 * It avoids having them test for it to be NULL and only then calling 1975 * device_private. 1976 */ 1977 return dev == NULL ? NULL : dev->dv_private; 1978 } 1979 1980 prop_dictionary_t 1981 device_properties(device_t dev) 1982 { 1983 1984 return (dev->dv_properties); 1985 } 1986 1987 /* 1988 * device_is_a: 1989 * 1990 * Returns true if the device is an instance of the specified 1991 * driver. 1992 */ 1993 bool 1994 device_is_a(device_t dev, const char *dname) 1995 { 1996 1997 return (strcmp(dev->dv_cfdriver->cd_name, dname) == 0); 1998 } 1999 2000 /* 2001 * device_find_by_xname: 2002 * 2003 * Returns the device of the given name or NULL if it doesn't exist. 2004 */ 2005 device_t 2006 device_find_by_xname(const char *name) 2007 { 2008 device_t dv; 2009 deviter_t di; 2010 2011 for (dv = deviter_first(&di, 0); dv != NULL; dv = deviter_next(&di)) { 2012 if (strcmp(device_xname(dv), name) == 0) 2013 break; 2014 } 2015 deviter_release(&di); 2016 2017 return dv; 2018 } 2019 2020 /* 2021 * device_find_by_driver_unit: 2022 * 2023 * Returns the device of the given driver name and unit or 2024 * NULL if it doesn't exist. 2025 */ 2026 device_t 2027 device_find_by_driver_unit(const char *name, int unit) 2028 { 2029 struct cfdriver *cd; 2030 2031 if ((cd = config_cfdriver_lookup(name)) == NULL) 2032 return NULL; 2033 return device_lookup(cd, unit); 2034 } 2035 2036 /* 2037 * Power management related functions. 2038 */ 2039 2040 bool 2041 device_pmf_is_registered(device_t dev) 2042 { 2043 return (dev->dv_flags & DVF_POWER_HANDLERS) != 0; 2044 } 2045 2046 bool 2047 device_pmf_driver_suspend(device_t dev PMF_FN_ARGS) 2048 { 2049 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2050 return true; 2051 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2052 return false; 2053 if (*dev->dv_driver_suspend != NULL && 2054 !(*dev->dv_driver_suspend)(dev PMF_FN_CALL)) 2055 return false; 2056 2057 dev->dv_flags |= DVF_DRIVER_SUSPENDED; 2058 return true; 2059 } 2060 2061 bool 2062 device_pmf_driver_resume(device_t dev PMF_FN_ARGS) 2063 { 2064 if ((dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2065 return true; 2066 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2067 return false; 2068 if ((flags & PMF_F_SELF) != 0 && !device_is_self_suspended(dev)) 2069 return false; 2070 if (*dev->dv_driver_resume != NULL && 2071 !(*dev->dv_driver_resume)(dev PMF_FN_CALL)) 2072 return false; 2073 2074 dev->dv_flags &= ~DVF_DRIVER_SUSPENDED; 2075 return true; 2076 } 2077 2078 bool 2079 device_pmf_driver_shutdown(device_t dev, int how) 2080 { 2081 2082 if (*dev->dv_driver_shutdown != NULL && 2083 !(*dev->dv_driver_shutdown)(dev, how)) 2084 return false; 2085 return true; 2086 } 2087 2088 bool 2089 device_pmf_driver_register(device_t dev, 2090 bool (*suspend)(device_t PMF_FN_PROTO), 2091 bool (*resume)(device_t PMF_FN_PROTO), 2092 bool (*shutdown)(device_t, int)) 2093 { 2094 pmf_private_t *pp; 2095 2096 if ((pp = kmem_zalloc(sizeof(*pp), KM_SLEEP)) == NULL) 2097 return false; 2098 mutex_init(&pp->pp_mtx, MUTEX_DEFAULT, IPL_NONE); 2099 cv_init(&pp->pp_cv, "pmfsusp"); 2100 dev->dv_pmf_private = pp; 2101 2102 dev->dv_driver_suspend = suspend; 2103 dev->dv_driver_resume = resume; 2104 dev->dv_driver_shutdown = shutdown; 2105 dev->dv_flags |= DVF_POWER_HANDLERS; 2106 return true; 2107 } 2108 2109 static const char * 2110 curlwp_name(void) 2111 { 2112 if (curlwp->l_name != NULL) 2113 return curlwp->l_name; 2114 else 2115 return curlwp->l_proc->p_comm; 2116 } 2117 2118 void 2119 device_pmf_driver_deregister(device_t dev) 2120 { 2121 pmf_private_t *pp = dev->dv_pmf_private; 2122 2123 /* XXX avoid crash in case we are not initialized */ 2124 if (!pp) 2125 return; 2126 2127 dev->dv_driver_suspend = NULL; 2128 dev->dv_driver_resume = NULL; 2129 2130 mutex_enter(&pp->pp_mtx); 2131 dev->dv_flags &= ~DVF_POWER_HANDLERS; 2132 while (pp->pp_nlock > 0 || pp->pp_nwait > 0) { 2133 /* Wake a thread that waits for the lock. That 2134 * thread will fail to acquire the lock, and then 2135 * it will wake the next thread that waits for the 2136 * lock, or else it will wake us. 2137 */ 2138 cv_signal(&pp->pp_cv); 2139 pmflock_debug(dev, __func__, __LINE__); 2140 cv_wait(&pp->pp_cv, &pp->pp_mtx); 2141 pmflock_debug(dev, __func__, __LINE__); 2142 } 2143 dev->dv_pmf_private = NULL; 2144 mutex_exit(&pp->pp_mtx); 2145 2146 cv_destroy(&pp->pp_cv); 2147 mutex_destroy(&pp->pp_mtx); 2148 kmem_free(pp, sizeof(*pp)); 2149 } 2150 2151 bool 2152 device_pmf_driver_child_register(device_t dev) 2153 { 2154 device_t parent = device_parent(dev); 2155 2156 if (parent == NULL || parent->dv_driver_child_register == NULL) 2157 return true; 2158 return (*parent->dv_driver_child_register)(dev); 2159 } 2160 2161 void 2162 device_pmf_driver_set_child_register(device_t dev, 2163 bool (*child_register)(device_t)) 2164 { 2165 dev->dv_driver_child_register = child_register; 2166 } 2167 2168 void 2169 device_pmf_self_resume(device_t dev PMF_FN_ARGS) 2170 { 2171 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2172 if ((dev->dv_flags & DVF_SELF_SUSPENDED) != 0) 2173 dev->dv_flags &= ~DVF_SELF_SUSPENDED; 2174 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2175 } 2176 2177 bool 2178 device_is_self_suspended(device_t dev) 2179 { 2180 return (dev->dv_flags & DVF_SELF_SUSPENDED) != 0; 2181 } 2182 2183 void 2184 device_pmf_self_suspend(device_t dev PMF_FN_ARGS) 2185 { 2186 bool self = (flags & PMF_F_SELF) != 0; 2187 2188 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2189 2190 if (!self) 2191 dev->dv_flags &= ~DVF_SELF_SUSPENDED; 2192 else if (device_is_active(dev)) 2193 dev->dv_flags |= DVF_SELF_SUSPENDED; 2194 2195 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2196 } 2197 2198 static void 2199 pmflock_debug(device_t dev, const char *func, int line) 2200 { 2201 pmf_private_t *pp = device_pmf_private(dev); 2202 2203 aprint_debug_dev(dev, "%s.%d, %s pp_nlock %d pp_nwait %d dv_flags %x\n", 2204 func, line, curlwp_name(), pp->pp_nlock, pp->pp_nwait, 2205 dev->dv_flags); 2206 } 2207 2208 static void 2209 pmflock_debug_with_flags(device_t dev, const char *func, int line PMF_FN_ARGS) 2210 { 2211 pmf_private_t *pp = device_pmf_private(dev); 2212 2213 aprint_debug_dev(dev, "%s.%d, %s pp_nlock %d pp_nwait %d dv_flags %x " 2214 "flags " PMF_FLAGS_FMT "\n", func, line, curlwp_name(), 2215 pp->pp_nlock, pp->pp_nwait, dev->dv_flags PMF_FN_CALL); 2216 } 2217 2218 static bool 2219 device_pmf_lock1(device_t dev PMF_FN_ARGS) 2220 { 2221 pmf_private_t *pp = device_pmf_private(dev); 2222 2223 while (device_pmf_is_registered(dev) && 2224 pp->pp_nlock > 0 && pp->pp_holder != curlwp) { 2225 pp->pp_nwait++; 2226 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2227 cv_wait(&pp->pp_cv, &pp->pp_mtx); 2228 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2229 pp->pp_nwait--; 2230 } 2231 if (!device_pmf_is_registered(dev)) { 2232 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2233 /* We could not acquire the lock, but some other thread may 2234 * wait for it, also. Wake that thread. 2235 */ 2236 cv_signal(&pp->pp_cv); 2237 return false; 2238 } 2239 pp->pp_nlock++; 2240 pp->pp_holder = curlwp; 2241 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2242 return true; 2243 } 2244 2245 bool 2246 device_pmf_lock(device_t dev PMF_FN_ARGS) 2247 { 2248 bool rc; 2249 pmf_private_t *pp = device_pmf_private(dev); 2250 2251 mutex_enter(&pp->pp_mtx); 2252 rc = device_pmf_lock1(dev PMF_FN_CALL); 2253 mutex_exit(&pp->pp_mtx); 2254 2255 return rc; 2256 } 2257 2258 void 2259 device_pmf_unlock(device_t dev PMF_FN_ARGS) 2260 { 2261 pmf_private_t *pp = device_pmf_private(dev); 2262 2263 KASSERT(pp->pp_nlock > 0); 2264 mutex_enter(&pp->pp_mtx); 2265 if (--pp->pp_nlock == 0) 2266 pp->pp_holder = NULL; 2267 cv_signal(&pp->pp_cv); 2268 pmflock_debug_with_flags(dev, __func__, __LINE__ PMF_FN_CALL); 2269 mutex_exit(&pp->pp_mtx); 2270 } 2271 2272 void * 2273 device_pmf_private(device_t dev) 2274 { 2275 return dev->dv_pmf_private; 2276 } 2277 2278 void * 2279 device_pmf_bus_private(device_t dev) 2280 { 2281 return dev->dv_bus_private; 2282 } 2283 2284 bool 2285 device_pmf_bus_suspend(device_t dev PMF_FN_ARGS) 2286 { 2287 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0) 2288 return true; 2289 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0 || 2290 (dev->dv_flags & DVF_DRIVER_SUSPENDED) == 0) 2291 return false; 2292 if (*dev->dv_bus_suspend != NULL && 2293 !(*dev->dv_bus_suspend)(dev PMF_FN_CALL)) 2294 return false; 2295 2296 dev->dv_flags |= DVF_BUS_SUSPENDED; 2297 return true; 2298 } 2299 2300 bool 2301 device_pmf_bus_resume(device_t dev PMF_FN_ARGS) 2302 { 2303 if ((dev->dv_flags & DVF_BUS_SUSPENDED) == 0) 2304 return true; 2305 if ((flags & PMF_F_SELF) != 0 && !device_is_self_suspended(dev)) 2306 return false; 2307 if (*dev->dv_bus_resume != NULL && 2308 !(*dev->dv_bus_resume)(dev PMF_FN_CALL)) 2309 return false; 2310 2311 dev->dv_flags &= ~DVF_BUS_SUSPENDED; 2312 return true; 2313 } 2314 2315 bool 2316 device_pmf_bus_shutdown(device_t dev, int how) 2317 { 2318 2319 if (*dev->dv_bus_shutdown != NULL && 2320 !(*dev->dv_bus_shutdown)(dev, how)) 2321 return false; 2322 return true; 2323 } 2324 2325 void 2326 device_pmf_bus_register(device_t dev, void *priv, 2327 bool (*suspend)(device_t PMF_FN_PROTO), 2328 bool (*resume)(device_t PMF_FN_PROTO), 2329 bool (*shutdown)(device_t, int), void (*deregister)(device_t)) 2330 { 2331 dev->dv_bus_private = priv; 2332 dev->dv_bus_resume = resume; 2333 dev->dv_bus_suspend = suspend; 2334 dev->dv_bus_shutdown = shutdown; 2335 dev->dv_bus_deregister = deregister; 2336 } 2337 2338 void 2339 device_pmf_bus_deregister(device_t dev) 2340 { 2341 if (dev->dv_bus_deregister == NULL) 2342 return; 2343 (*dev->dv_bus_deregister)(dev); 2344 dev->dv_bus_private = NULL; 2345 dev->dv_bus_suspend = NULL; 2346 dev->dv_bus_resume = NULL; 2347 dev->dv_bus_deregister = NULL; 2348 } 2349 2350 void * 2351 device_pmf_class_private(device_t dev) 2352 { 2353 return dev->dv_class_private; 2354 } 2355 2356 bool 2357 device_pmf_class_suspend(device_t dev PMF_FN_ARGS) 2358 { 2359 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) != 0) 2360 return true; 2361 if (*dev->dv_class_suspend != NULL && 2362 !(*dev->dv_class_suspend)(dev PMF_FN_CALL)) 2363 return false; 2364 2365 dev->dv_flags |= DVF_CLASS_SUSPENDED; 2366 return true; 2367 } 2368 2369 bool 2370 device_pmf_class_resume(device_t dev PMF_FN_ARGS) 2371 { 2372 if ((dev->dv_flags & DVF_CLASS_SUSPENDED) == 0) 2373 return true; 2374 if ((dev->dv_flags & DVF_BUS_SUSPENDED) != 0 || 2375 (dev->dv_flags & DVF_DRIVER_SUSPENDED) != 0) 2376 return false; 2377 if (*dev->dv_class_resume != NULL && 2378 !(*dev->dv_class_resume)(dev PMF_FN_CALL)) 2379 return false; 2380 2381 dev->dv_flags &= ~DVF_CLASS_SUSPENDED; 2382 return true; 2383 } 2384 2385 void 2386 device_pmf_class_register(device_t dev, void *priv, 2387 bool (*suspend)(device_t PMF_FN_PROTO), 2388 bool (*resume)(device_t PMF_FN_PROTO), 2389 void (*deregister)(device_t)) 2390 { 2391 dev->dv_class_private = priv; 2392 dev->dv_class_suspend = suspend; 2393 dev->dv_class_resume = resume; 2394 dev->dv_class_deregister = deregister; 2395 } 2396 2397 void 2398 device_pmf_class_deregister(device_t dev) 2399 { 2400 if (dev->dv_class_deregister == NULL) 2401 return; 2402 (*dev->dv_class_deregister)(dev); 2403 dev->dv_class_private = NULL; 2404 dev->dv_class_suspend = NULL; 2405 dev->dv_class_resume = NULL; 2406 dev->dv_class_deregister = NULL; 2407 } 2408 2409 bool 2410 device_active(device_t dev, devactive_t type) 2411 { 2412 size_t i; 2413 2414 if (dev->dv_activity_count == 0) 2415 return false; 2416 2417 for (i = 0; i < dev->dv_activity_count; ++i) { 2418 if (dev->dv_activity_handlers[i] == NULL) 2419 break; 2420 (*dev->dv_activity_handlers[i])(dev, type); 2421 } 2422 2423 return true; 2424 } 2425 2426 bool 2427 device_active_register(device_t dev, void (*handler)(device_t, devactive_t)) 2428 { 2429 void (**new_handlers)(device_t, devactive_t); 2430 void (**old_handlers)(device_t, devactive_t); 2431 size_t i, old_size, new_size; 2432 int s; 2433 2434 old_handlers = dev->dv_activity_handlers; 2435 old_size = dev->dv_activity_count; 2436 2437 for (i = 0; i < old_size; ++i) { 2438 KASSERT(old_handlers[i] != handler); 2439 if (old_handlers[i] == NULL) { 2440 old_handlers[i] = handler; 2441 return true; 2442 } 2443 } 2444 2445 new_size = old_size + 4; 2446 new_handlers = kmem_alloc(sizeof(void *[new_size]), KM_SLEEP); 2447 2448 memcpy(new_handlers, old_handlers, sizeof(void *[old_size])); 2449 new_handlers[old_size] = handler; 2450 memset(new_handlers + old_size + 1, 0, 2451 sizeof(int [new_size - (old_size+1)])); 2452 2453 s = splhigh(); 2454 dev->dv_activity_count = new_size; 2455 dev->dv_activity_handlers = new_handlers; 2456 splx(s); 2457 2458 if (old_handlers != NULL) 2459 kmem_free(old_handlers, sizeof(void * [old_size])); 2460 2461 return true; 2462 } 2463 2464 void 2465 device_active_deregister(device_t dev, void (*handler)(device_t, devactive_t)) 2466 { 2467 void (**old_handlers)(device_t, devactive_t); 2468 size_t i, old_size; 2469 int s; 2470 2471 old_handlers = dev->dv_activity_handlers; 2472 old_size = dev->dv_activity_count; 2473 2474 for (i = 0; i < old_size; ++i) { 2475 if (old_handlers[i] == handler) 2476 break; 2477 if (old_handlers[i] == NULL) 2478 return; /* XXX panic? */ 2479 } 2480 2481 if (i == old_size) 2482 return; /* XXX panic? */ 2483 2484 for (; i < old_size - 1; ++i) { 2485 if ((old_handlers[i] = old_handlers[i + 1]) != NULL) 2486 continue; 2487 2488 if (i == 0) { 2489 s = splhigh(); 2490 dev->dv_activity_count = 0; 2491 dev->dv_activity_handlers = NULL; 2492 splx(s); 2493 kmem_free(old_handlers, sizeof(void *[old_size])); 2494 } 2495 return; 2496 } 2497 old_handlers[i] = NULL; 2498 } 2499 2500 /* 2501 * Device Iteration 2502 * 2503 * deviter_t: a device iterator. Holds state for a "walk" visiting 2504 * each device_t's in the device tree. 2505 * 2506 * deviter_init(di, flags): initialize the device iterator `di' 2507 * to "walk" the device tree. deviter_next(di) will return 2508 * the first device_t in the device tree, or NULL if there are 2509 * no devices. 2510 * 2511 * `flags' is one or more of DEVITER_F_RW, indicating that the 2512 * caller intends to modify the device tree by calling 2513 * config_detach(9) on devices in the order that the iterator 2514 * returns them; DEVITER_F_ROOT_FIRST, asking for the devices 2515 * nearest the "root" of the device tree to be returned, first; 2516 * DEVITER_F_LEAVES_FIRST, asking for the devices furthest from 2517 * the root of the device tree, first; and DEVITER_F_SHUTDOWN, 2518 * indicating both that deviter_init() should not respect any 2519 * locks on the device tree, and that deviter_next(di) may run 2520 * in more than one LWP before the walk has finished. 2521 * 2522 * Only one DEVITER_F_RW iterator may be in the device tree at 2523 * once. 2524 * 2525 * DEVITER_F_SHUTDOWN implies DEVITER_F_RW. 2526 * 2527 * Results are undefined if the flags DEVITER_F_ROOT_FIRST and 2528 * DEVITER_F_LEAVES_FIRST are used in combination. 2529 * 2530 * deviter_first(di, flags): initialize the device iterator `di' 2531 * and return the first device_t in the device tree, or NULL 2532 * if there are no devices. The statement 2533 * 2534 * dv = deviter_first(di); 2535 * 2536 * is shorthand for 2537 * 2538 * deviter_init(di); 2539 * dv = deviter_next(di); 2540 * 2541 * deviter_next(di): return the next device_t in the device tree, 2542 * or NULL if there are no more devices. deviter_next(di) 2543 * is undefined if `di' was not initialized with deviter_init() or 2544 * deviter_first(). 2545 * 2546 * deviter_release(di): stops iteration (subsequent calls to 2547 * deviter_next() will return NULL), releases any locks and 2548 * resources held by the device iterator. 2549 * 2550 * Device iteration does not return device_t's in any particular 2551 * order. An iterator will never return the same device_t twice. 2552 * Device iteration is guaranteed to complete---i.e., if deviter_next(di) 2553 * is called repeatedly on the same `di', it will eventually return 2554 * NULL. It is ok to attach/detach devices during device iteration. 2555 */ 2556 void 2557 deviter_init(deviter_t *di, deviter_flags_t flags) 2558 { 2559 device_t dv; 2560 bool rw; 2561 2562 mutex_enter(&alldevs_mtx); 2563 if ((flags & DEVITER_F_SHUTDOWN) != 0) { 2564 flags |= DEVITER_F_RW; 2565 alldevs_nwrite++; 2566 alldevs_writer = NULL; 2567 alldevs_nread = 0; 2568 } else { 2569 rw = (flags & DEVITER_F_RW) != 0; 2570 2571 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 2572 ; 2573 else while ((alldevs_nwrite != 0 && alldevs_writer != curlwp) || 2574 (rw && alldevs_nread != 0)) 2575 cv_wait(&alldevs_cv, &alldevs_mtx); 2576 2577 if (rw) { 2578 if (alldevs_nwrite++ == 0) 2579 alldevs_writer = curlwp; 2580 } else 2581 alldevs_nread++; 2582 } 2583 mutex_exit(&alldevs_mtx); 2584 2585 memset(di, 0, sizeof(*di)); 2586 2587 di->di_flags = flags; 2588 2589 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2590 case DEVITER_F_LEAVES_FIRST: 2591 TAILQ_FOREACH(dv, &alldevs, dv_list) 2592 di->di_curdepth = MAX(di->di_curdepth, dv->dv_depth); 2593 break; 2594 case DEVITER_F_ROOT_FIRST: 2595 TAILQ_FOREACH(dv, &alldevs, dv_list) 2596 di->di_maxdepth = MAX(di->di_maxdepth, dv->dv_depth); 2597 break; 2598 default: 2599 break; 2600 } 2601 2602 deviter_reinit(di); 2603 } 2604 2605 static void 2606 deviter_reinit(deviter_t *di) 2607 { 2608 if ((di->di_flags & DEVITER_F_RW) != 0) 2609 di->di_prev = TAILQ_LAST(&alldevs, devicelist); 2610 else 2611 di->di_prev = TAILQ_FIRST(&alldevs); 2612 } 2613 2614 device_t 2615 deviter_first(deviter_t *di, deviter_flags_t flags) 2616 { 2617 deviter_init(di, flags); 2618 return deviter_next(di); 2619 } 2620 2621 static device_t 2622 deviter_next1(deviter_t *di) 2623 { 2624 device_t dv; 2625 2626 dv = di->di_prev; 2627 2628 if (dv == NULL) 2629 ; 2630 else if ((di->di_flags & DEVITER_F_RW) != 0) 2631 di->di_prev = TAILQ_PREV(dv, devicelist, dv_list); 2632 else 2633 di->di_prev = TAILQ_NEXT(dv, dv_list); 2634 2635 return dv; 2636 } 2637 2638 device_t 2639 deviter_next(deviter_t *di) 2640 { 2641 device_t dv = NULL; 2642 2643 switch (di->di_flags & (DEVITER_F_LEAVES_FIRST|DEVITER_F_ROOT_FIRST)) { 2644 case 0: 2645 return deviter_next1(di); 2646 case DEVITER_F_LEAVES_FIRST: 2647 while (di->di_curdepth >= 0) { 2648 if ((dv = deviter_next1(di)) == NULL) { 2649 di->di_curdepth--; 2650 deviter_reinit(di); 2651 } else if (dv->dv_depth == di->di_curdepth) 2652 break; 2653 } 2654 return dv; 2655 case DEVITER_F_ROOT_FIRST: 2656 while (di->di_curdepth <= di->di_maxdepth) { 2657 if ((dv = deviter_next1(di)) == NULL) { 2658 di->di_curdepth++; 2659 deviter_reinit(di); 2660 } else if (dv->dv_depth == di->di_curdepth) 2661 break; 2662 } 2663 return dv; 2664 default: 2665 return NULL; 2666 } 2667 } 2668 2669 void 2670 deviter_release(deviter_t *di) 2671 { 2672 bool rw = (di->di_flags & DEVITER_F_RW) != 0; 2673 2674 mutex_enter(&alldevs_mtx); 2675 if (alldevs_nwrite > 0 && alldevs_writer == NULL) 2676 --alldevs_nwrite; 2677 else { 2678 2679 if (rw) { 2680 if (--alldevs_nwrite == 0) 2681 alldevs_writer = NULL; 2682 } else 2683 --alldevs_nread; 2684 2685 cv_signal(&alldevs_cv); 2686 } 2687 mutex_exit(&alldevs_mtx); 2688 } 2689
Indexes created Thu Sep 25 16:09:42 GMT 2025